1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 #include "got_keyword.h"
62 
63 #ifndef MIN
64 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
65 #endif
66 
67 #ifndef MAX
68 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
69 #endif
70 
71 #ifndef CTRL
72 #define CTRL(x)		((x) & 0x1f)
73 #endif
74 
75 #ifndef nitems
76 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
77 #endif
78 
79 struct tog_cmd {
80 	const char *name;
81 	const struct got_error *(*cmd_main)(int, char *[]);
82 	void (*cmd_usage)(void);
83 };
84 
85 __dead static void	usage(int, int);
86 __dead static void	usage_log(void);
87 __dead static void	usage_diff(void);
88 __dead static void	usage_blame(void);
89 __dead static void	usage_tree(void);
90 __dead static void	usage_ref(void);
91 
92 static const struct got_error*	cmd_log(int, char *[]);
93 static const struct got_error*	cmd_diff(int, char *[]);
94 static const struct got_error*	cmd_blame(int, char *[]);
95 static const struct got_error*	cmd_tree(int, char *[]);
96 static const struct got_error*	cmd_ref(int, char *[]);
97 
98 static const struct tog_cmd tog_commands[] = {
99 	{ "log",	cmd_log,	usage_log },
100 	{ "diff",	cmd_diff,	usage_diff },
101 	{ "blame",	cmd_blame,	usage_blame },
102 	{ "tree",	cmd_tree,	usage_tree },
103 	{ "ref",	cmd_ref,	usage_ref },
104 };
105 
106 enum tog_view_type {
107 	TOG_VIEW_DIFF,
108 	TOG_VIEW_LOG,
109 	TOG_VIEW_BLAME,
110 	TOG_VIEW_TREE,
111 	TOG_VIEW_REF,
112 	TOG_VIEW_HELP
113 };
114 
115 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
116 enum tog_keymap_type {
117 	TOG_KEYMAP_KEYS = -2,
118 	TOG_KEYMAP_GLOBAL,
119 	TOG_KEYMAP_DIFF,
120 	TOG_KEYMAP_LOG,
121 	TOG_KEYMAP_BLAME,
122 	TOG_KEYMAP_TREE,
123 	TOG_KEYMAP_REF,
124 	TOG_KEYMAP_HELP
125 };
126 
127 enum tog_view_mode {
128 	TOG_VIEW_SPLIT_NONE,
129 	TOG_VIEW_SPLIT_VERT,
130 	TOG_VIEW_SPLIT_HRZN
131 };
132 
133 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
134 
135 #define TOG_EOF_STRING	"(END)"
136 
137 struct commit_queue_entry {
138 	TAILQ_ENTRY(commit_queue_entry) entry;
139 	struct got_object_id *id;
140 	struct got_commit_object *commit;
141 	int idx;
142 };
143 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
144 struct commit_queue {
145 	int ncommits;
146 	struct commit_queue_head head;
147 };
148 
149 struct tog_color {
150 	STAILQ_ENTRY(tog_color) entry;
151 	regex_t regex;
152 	short colorpair;
153 };
154 STAILQ_HEAD(tog_colors, tog_color);
155 
156 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
157 static struct got_reflist_object_id_map *tog_refs_idmap;
158 static struct {
159 	struct got_object_id	*id;
160 	int			 idx;
161 	char			 marker;
162 } tog_base_commit;
163 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
164 
165 static const struct got_error *
166 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
167     struct got_reference* re2)
168 {
169 	const char *name1 = got_ref_get_name(re1);
170 	const char *name2 = got_ref_get_name(re2);
171 	int isbackup1, isbackup2;
172 
173 	/* Sort backup refs towards the bottom of the list. */
174 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
175 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
176 	if (!isbackup1 && isbackup2) {
177 		*cmp = -1;
178 		return NULL;
179 	} else if (isbackup1 && !isbackup2) {
180 		*cmp = 1;
181 		return NULL;
182 	}
183 
184 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
185 	return NULL;
186 }
187 
188 static const struct got_error *
189 tog_load_refs(struct got_repository *repo, int sort_by_date)
190 {
191 	const struct got_error *err;
192 
193 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
194 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
195 	    repo);
196 	if (err)
197 		return err;
198 
199 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
200 	    repo);
201 }
202 
203 static void
204 tog_free_refs(void)
205 {
206 	if (tog_refs_idmap) {
207 		got_reflist_object_id_map_free(tog_refs_idmap);
208 		tog_refs_idmap = NULL;
209 	}
210 	got_ref_list_free(&tog_refs);
211 }
212 
213 static const struct got_error *
214 add_color(struct tog_colors *colors, const char *pattern,
215     int idx, short color)
216 {
217 	const struct got_error *err = NULL;
218 	struct tog_color *tc;
219 	int regerr = 0;
220 
221 	if (idx < 1 || idx > COLOR_PAIRS - 1)
222 		return NULL;
223 
224 	init_pair(idx, color, -1);
225 
226 	tc = calloc(1, sizeof(*tc));
227 	if (tc == NULL)
228 		return got_error_from_errno("calloc");
229 	regerr = regcomp(&tc->regex, pattern,
230 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
231 	if (regerr) {
232 		static char regerr_msg[512];
233 		static char err_msg[512];
234 		regerror(regerr, &tc->regex, regerr_msg,
235 		    sizeof(regerr_msg));
236 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
237 		    regerr_msg);
238 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
239 		free(tc);
240 		return err;
241 	}
242 	tc->colorpair = idx;
243 	STAILQ_INSERT_HEAD(colors, tc, entry);
244 	return NULL;
245 }
246 
247 static void
248 free_colors(struct tog_colors *colors)
249 {
250 	struct tog_color *tc;
251 
252 	while (!STAILQ_EMPTY(colors)) {
253 		tc = STAILQ_FIRST(colors);
254 		STAILQ_REMOVE_HEAD(colors, entry);
255 		regfree(&tc->regex);
256 		free(tc);
257 	}
258 }
259 
260 static struct tog_color *
261 get_color(struct tog_colors *colors, int colorpair)
262 {
263 	struct tog_color *tc = NULL;
264 
265 	STAILQ_FOREACH(tc, colors, entry) {
266 		if (tc->colorpair == colorpair)
267 			return tc;
268 	}
269 
270 	return NULL;
271 }
272 
273 static int
274 default_color_value(const char *envvar)
275 {
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
281 		return COLOR_YELLOW;
282 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
285 		return COLOR_MAGENTA;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
287 		return COLOR_MAGENTA;
288 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
291 		return COLOR_GREEN;
292 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
295 		return COLOR_CYAN;
296 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
299 		return COLOR_GREEN;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
301 		return COLOR_MAGENTA;
302 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
303 		return COLOR_YELLOW;
304 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
305 		return COLOR_CYAN;
306 
307 	return -1;
308 }
309 
310 static int
311 get_color_value(const char *envvar)
312 {
313 	const char *val = getenv(envvar);
314 
315 	if (val == NULL)
316 		return default_color_value(envvar);
317 
318 	if (strcasecmp(val, "black") == 0)
319 		return COLOR_BLACK;
320 	if (strcasecmp(val, "red") == 0)
321 		return COLOR_RED;
322 	if (strcasecmp(val, "green") == 0)
323 		return COLOR_GREEN;
324 	if (strcasecmp(val, "yellow") == 0)
325 		return COLOR_YELLOW;
326 	if (strcasecmp(val, "blue") == 0)
327 		return COLOR_BLUE;
328 	if (strcasecmp(val, "magenta") == 0)
329 		return COLOR_MAGENTA;
330 	if (strcasecmp(val, "cyan") == 0)
331 		return COLOR_CYAN;
332 	if (strcasecmp(val, "white") == 0)
333 		return COLOR_WHITE;
334 	if (strcasecmp(val, "default") == 0)
335 		return -1;
336 
337 	return default_color_value(envvar);
338 }
339 
340 struct tog_diff_view_state {
341 	struct got_object_id *id1, *id2;
342 	const char *label1, *label2;
343 	FILE *f, *f1, *f2;
344 	int fd1, fd2;
345 	int lineno;
346 	int first_displayed_line;
347 	int last_displayed_line;
348 	int eof;
349 	int diff_context;
350 	int ignore_whitespace;
351 	int force_text_diff;
352 	struct got_repository *repo;
353 	struct got_diff_line *lines;
354 	size_t nlines;
355 	int matched_line;
356 	int selected_line;
357 
358 	/* passed from log or blame view; may be NULL */
359 	struct tog_view *parent_view;
360 };
361 
362 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
363 static volatile sig_atomic_t tog_thread_error;
364 
365 struct tog_log_thread_args {
366 	pthread_cond_t need_commits;
367 	pthread_cond_t commit_loaded;
368 	int commits_needed;
369 	int load_all;
370 	struct got_commit_graph *graph;
371 	struct commit_queue *real_commits;
372 	const char *in_repo_path;
373 	struct got_object_id *start_id;
374 	struct got_repository *repo;
375 	int *pack_fds;
376 	int log_complete;
377 	pthread_cond_t log_loaded;
378 	sig_atomic_t *quit;
379 	struct commit_queue_entry **first_displayed_entry;
380 	struct commit_queue_entry **selected_entry;
381 	int *searching;
382 	int *search_next_done;
383 	regex_t *regex;
384 	int *limiting;
385 	int limit_match;
386 	regex_t *limit_regex;
387 	struct commit_queue *limit_commits;
388 	struct got_worktree *worktree;
389 	int need_commit_marker;
390 };
391 
392 struct tog_log_view_state {
393 	struct commit_queue *commits;
394 	struct commit_queue_entry *first_displayed_entry;
395 	struct commit_queue_entry *last_displayed_entry;
396 	struct commit_queue_entry *selected_entry;
397 	struct commit_queue real_commits;
398 	int selected;
399 	char *in_repo_path;
400 	char *head_ref_name;
401 	int log_branches;
402 	struct got_repository *repo;
403 	struct got_object_id *start_id;
404 	sig_atomic_t quit;
405 	pthread_t thread;
406 	struct tog_log_thread_args thread_args;
407 	struct commit_queue_entry *matched_entry;
408 	struct commit_queue_entry *search_entry;
409 	struct tog_colors colors;
410 	int use_committer;
411 	int limit_view;
412 	regex_t limit_regex;
413 	struct commit_queue limit_commits;
414 };
415 
416 #define TOG_COLOR_DIFF_MINUS		1
417 #define TOG_COLOR_DIFF_PLUS		2
418 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
419 #define TOG_COLOR_DIFF_META		4
420 #define TOG_COLOR_TREE_SUBMODULE	5
421 #define TOG_COLOR_TREE_SYMLINK		6
422 #define TOG_COLOR_TREE_DIRECTORY	7
423 #define TOG_COLOR_TREE_EXECUTABLE	8
424 #define TOG_COLOR_COMMIT		9
425 #define TOG_COLOR_AUTHOR		10
426 #define TOG_COLOR_DATE			11
427 #define TOG_COLOR_REFS_HEADS		12
428 #define TOG_COLOR_REFS_TAGS		13
429 #define TOG_COLOR_REFS_REMOTES		14
430 #define TOG_COLOR_REFS_BACKUP		15
431 
432 struct tog_blame_cb_args {
433 	struct tog_blame_line *lines; /* one per line */
434 	int nlines;
435 
436 	struct tog_view *view;
437 	struct got_object_id *commit_id;
438 	int *quit;
439 };
440 
441 struct tog_blame_thread_args {
442 	const char *path;
443 	struct got_repository *repo;
444 	struct tog_blame_cb_args *cb_args;
445 	int *complete;
446 	got_cancel_cb cancel_cb;
447 	void *cancel_arg;
448 	pthread_cond_t blame_complete;
449 };
450 
451 struct tog_blame {
452 	FILE *f;
453 	off_t filesize;
454 	struct tog_blame_line *lines;
455 	int nlines;
456 	off_t *line_offsets;
457 	pthread_t thread;
458 	struct tog_blame_thread_args thread_args;
459 	struct tog_blame_cb_args cb_args;
460 	const char *path;
461 	int *pack_fds;
462 };
463 
464 struct tog_blame_view_state {
465 	int first_displayed_line;
466 	int last_displayed_line;
467 	int selected_line;
468 	int last_diffed_line;
469 	int blame_complete;
470 	int eof;
471 	int done;
472 	struct got_object_id_queue blamed_commits;
473 	struct got_object_qid *blamed_commit;
474 	char *path;
475 	struct got_repository *repo;
476 	struct got_object_id *commit_id;
477 	struct got_object_id *id_to_log;
478 	struct tog_blame blame;
479 	int matched_line;
480 	struct tog_colors colors;
481 };
482 
483 struct tog_parent_tree {
484 	TAILQ_ENTRY(tog_parent_tree) entry;
485 	struct got_tree_object *tree;
486 	struct got_tree_entry *first_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int selected;
489 };
490 
491 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
492 
493 struct tog_tree_view_state {
494 	char *tree_label;
495 	struct got_object_id *commit_id;/* commit which this tree belongs to */
496 	struct got_tree_object *root;	/* the commit's root tree entry */
497 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
498 	struct got_tree_entry *first_displayed_entry;
499 	struct got_tree_entry *last_displayed_entry;
500 	struct got_tree_entry *selected_entry;
501 	int ndisplayed, selected, show_ids;
502 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
503 	char *head_ref_name;
504 	struct got_repository *repo;
505 	struct got_tree_entry *matched_entry;
506 	struct tog_colors colors;
507 };
508 
509 struct tog_reflist_entry {
510 	TAILQ_ENTRY(tog_reflist_entry) entry;
511 	struct got_reference *ref;
512 	int idx;
513 };
514 
515 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
516 
517 struct tog_ref_view_state {
518 	struct tog_reflist_head refs;
519 	struct tog_reflist_entry *first_displayed_entry;
520 	struct tog_reflist_entry *last_displayed_entry;
521 	struct tog_reflist_entry *selected_entry;
522 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
523 	struct got_repository *repo;
524 	struct tog_reflist_entry *matched_entry;
525 	struct tog_colors colors;
526 };
527 
528 struct tog_help_view_state {
529 	FILE			*f;
530 	off_t			*line_offsets;
531 	size_t			 nlines;
532 	int			 lineno;
533 	int			 first_displayed_line;
534 	int			 last_displayed_line;
535 	int			 eof;
536 	int			 matched_line;
537 	int			 selected_line;
538 	int			 all;
539 	enum tog_keymap_type	 type;
540 };
541 
542 #define GENERATE_HELP \
543 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
544 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
545 	KEY_("k C-p Up", "Move cursor or page up one line"), \
546 	KEY_("j C-n Down", "Move cursor or page down one line"), \
547 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
548 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
549 	KEY_("C-u u", "Scroll the view up one half page"), \
550 	KEY_("C-d d", "Scroll the view down one half page"), \
551 	KEY_("g", "Go to line N (default: first line)"), \
552 	KEY_("Home =", "Go to the first line"), \
553 	KEY_("G", "Go to line N (default: last line)"), \
554 	KEY_("End *", "Go to the last line"), \
555 	KEY_("l Right", "Scroll the view right"), \
556 	KEY_("h Left", "Scroll the view left"), \
557 	KEY_("$", "Scroll view to the rightmost position"), \
558 	KEY_("0", "Scroll view to the leftmost position"), \
559 	KEY_("-", "Decrease size of the focussed split"), \
560 	KEY_("+", "Increase size of the focussed split"), \
561 	KEY_("Tab", "Switch focus between views"), \
562 	KEY_("F", "Toggle fullscreen mode"), \
563 	KEY_("S", "Switch split-screen layout"), \
564 	KEY_("/", "Open prompt to enter search term"), \
565 	KEY_("n", "Find next line/token matching the current search term"), \
566 	KEY_("N", "Find previous line/token matching the current search term"),\
567 	KEY_("q", "Quit the focussed view; Quit help screen"), \
568 	KEY_("Q", "Quit tog"), \
569 	\
570 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
571 	KEY_("< ,", "Move cursor up one commit"), \
572 	KEY_("> .", "Move cursor down one commit"), \
573 	KEY_("Enter", "Open diff view of the selected commit"), \
574 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
575 	KEY_("R", "Open ref view of all repository references"), \
576 	KEY_("T", "Display tree view of the repository from the selected" \
577 	    " commit"), \
578 	KEY_("@", "Toggle between displaying author and committer name"), \
579 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
580 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
581 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
582 	\
583 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
584 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
585 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
586 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
587 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
588 	    " data"), \
589 	KEY_("(", "Go to the previous file in the diff"), \
590 	KEY_(")", "Go to the next file in the diff"), \
591 	KEY_("{", "Go to the previous hunk in the diff"), \
592 	KEY_("}", "Go to the next hunk in the diff"), \
593 	KEY_("[", "Decrease the number of context lines"), \
594 	KEY_("]", "Increase the number of context lines"), \
595 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
596 	\
597 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
598 	KEY_("Enter", "Display diff view of the selected line's commit"), \
599 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
600 	KEY_("L", "Open log view for the currently selected annotated line"), \
601 	KEY_("C", "Reload view with the previously blamed commit"), \
602 	KEY_("c", "Reload view with the version of the file found in the" \
603 	    " selected line's commit"), \
604 	KEY_("p", "Reload view with the version of the file found in the" \
605 	    " selected line's parent commit"), \
606 	\
607 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
608 	KEY_("Enter", "Enter selected directory or open blame view of the" \
609 	    " selected file"), \
610 	KEY_("L", "Open log view for the selected entry"), \
611 	KEY_("R", "Open ref view of all repository references"), \
612 	KEY_("i", "Show object IDs for all tree entries"), \
613 	KEY_("Backspace", "Return to the parent directory"), \
614 	\
615 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
616 	KEY_("Enter", "Display log view of the selected reference"), \
617 	KEY_("T", "Display tree view of the selected reference"), \
618 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
619 	KEY_("m", "Toggle display of last modified date for each reference"), \
620 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
621 	KEY_("C-l", "Reload view with all repository references")
622 
623 struct tog_key_map {
624 	const char		*keys;
625 	const char		*info;
626 	enum tog_keymap_type	 type;
627 };
628 
629 /* curses io for tog regress */
630 struct tog_io {
631 	FILE	*cin;
632 	FILE	*cout;
633 	FILE	*f;
634 	FILE	*sdump;
635 	char	*input_str;
636 	int	 wait_for_ui;
637 } tog_io;
638 static int using_mock_io;
639 
640 #define TOG_KEY_SCRDUMP	SHRT_MIN
641 
642 /*
643  * We implement two types of views: parent views and child views.
644  *
645  * The 'Tab' key switches focus between a parent view and its child view.
646  * Child views are shown side-by-side to their parent view, provided
647  * there is enough screen estate.
648  *
649  * When a new view is opened from within a parent view, this new view
650  * becomes a child view of the parent view, replacing any existing child.
651  *
652  * When a new view is opened from within a child view, this new view
653  * becomes a parent view which will obscure the views below until the
654  * user quits the new parent view by typing 'q'.
655  *
656  * This list of views contains parent views only.
657  * Child views are only pointed to by their parent view.
658  */
659 TAILQ_HEAD(tog_view_list_head, tog_view);
660 
661 struct tog_view {
662 	TAILQ_ENTRY(tog_view) entry;
663 	WINDOW *window;
664 	PANEL *panel;
665 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
666 	int resized_y, resized_x; /* begin_y/x based on user resizing */
667 	int maxx, x; /* max column and current start column */
668 	int lines, cols; /* copies of LINES and COLS */
669 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
670 	int gline, hiline; /* navigate to and highlight this nG line */
671 	int ch, count; /* current keymap and count prefix */
672 	int resized; /* set when in a resize event */
673 	int focussed; /* Only set on one parent or child view at a time. */
674 	int dying;
675 	struct tog_view *parent;
676 	struct tog_view *child;
677 
678 	/*
679 	 * This flag is initially set on parent views when a new child view
680 	 * is created. It gets toggled when the 'Tab' key switches focus
681 	 * between parent and child.
682 	 * The flag indicates whether focus should be passed on to our child
683 	 * view if this parent view gets picked for focus after another parent
684 	 * view was closed. This prevents child views from losing focus in such
685 	 * situations.
686 	 */
687 	int focus_child;
688 
689 	enum tog_view_mode mode;
690 	/* type-specific state */
691 	enum tog_view_type type;
692 	union {
693 		struct tog_diff_view_state diff;
694 		struct tog_log_view_state log;
695 		struct tog_blame_view_state blame;
696 		struct tog_tree_view_state tree;
697 		struct tog_ref_view_state ref;
698 		struct tog_help_view_state help;
699 	} state;
700 
701 	const struct got_error *(*show)(struct tog_view *);
702 	const struct got_error *(*input)(struct tog_view **,
703 	    struct tog_view *, int);
704 	const struct got_error *(*reset)(struct tog_view *);
705 	const struct got_error *(*resize)(struct tog_view *, int);
706 	const struct got_error *(*close)(struct tog_view *);
707 
708 	const struct got_error *(*search_start)(struct tog_view *);
709 	const struct got_error *(*search_next)(struct tog_view *);
710 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
711 	    int **, int **, int **, int **);
712 	int search_started;
713 	int searching;
714 #define TOG_SEARCH_FORWARD	1
715 #define TOG_SEARCH_BACKWARD	2
716 	int search_next_done;
717 #define TOG_SEARCH_HAVE_MORE	1
718 #define TOG_SEARCH_NO_MORE	2
719 #define TOG_SEARCH_HAVE_NONE	3
720 	regex_t regex;
721 	regmatch_t regmatch;
722 	const char *action;
723 };
724 
725 static const struct got_error *open_diff_view(struct tog_view *,
726     struct got_object_id *, struct got_object_id *,
727     const char *, const char *, int, int, int, struct tog_view *,
728     struct got_repository *);
729 static const struct got_error *show_diff_view(struct tog_view *);
730 static const struct got_error *input_diff_view(struct tog_view **,
731     struct tog_view *, int);
732 static const struct got_error *reset_diff_view(struct tog_view *);
733 static const struct got_error* close_diff_view(struct tog_view *);
734 static const struct got_error *search_start_diff_view(struct tog_view *);
735 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
736     size_t *, int **, int **, int **, int **);
737 static const struct got_error *search_next_view_match(struct tog_view *);
738 
739 static const struct got_error *open_log_view(struct tog_view *,
740     struct got_object_id *, struct got_repository *,
741     const char *, const char *, int, struct got_worktree *);
742 static const struct got_error * show_log_view(struct tog_view *);
743 static const struct got_error *input_log_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *resize_log_view(struct tog_view *, int);
746 static const struct got_error *close_log_view(struct tog_view *);
747 static const struct got_error *search_start_log_view(struct tog_view *);
748 static const struct got_error *search_next_log_view(struct tog_view *);
749 
750 static const struct got_error *open_blame_view(struct tog_view *, char *,
751     struct got_object_id *, struct got_repository *);
752 static const struct got_error *show_blame_view(struct tog_view *);
753 static const struct got_error *input_blame_view(struct tog_view **,
754     struct tog_view *, int);
755 static const struct got_error *reset_blame_view(struct tog_view *);
756 static const struct got_error *close_blame_view(struct tog_view *);
757 static const struct got_error *search_start_blame_view(struct tog_view *);
758 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
759     size_t *, int **, int **, int **, int **);
760 
761 static const struct got_error *open_tree_view(struct tog_view *,
762     struct got_object_id *, const char *, struct got_repository *);
763 static const struct got_error *show_tree_view(struct tog_view *);
764 static const struct got_error *input_tree_view(struct tog_view **,
765     struct tog_view *, int);
766 static const struct got_error *close_tree_view(struct tog_view *);
767 static const struct got_error *search_start_tree_view(struct tog_view *);
768 static const struct got_error *search_next_tree_view(struct tog_view *);
769 
770 static const struct got_error *open_ref_view(struct tog_view *,
771     struct got_repository *);
772 static const struct got_error *show_ref_view(struct tog_view *);
773 static const struct got_error *input_ref_view(struct tog_view **,
774     struct tog_view *, int);
775 static const struct got_error *close_ref_view(struct tog_view *);
776 static const struct got_error *search_start_ref_view(struct tog_view *);
777 static const struct got_error *search_next_ref_view(struct tog_view *);
778 
779 static const struct got_error *open_help_view(struct tog_view *,
780     struct tog_view *);
781 static const struct got_error *show_help_view(struct tog_view *);
782 static const struct got_error *input_help_view(struct tog_view **,
783     struct tog_view *, int);
784 static const struct got_error *reset_help_view(struct tog_view *);
785 static const struct got_error* close_help_view(struct tog_view *);
786 static const struct got_error *search_start_help_view(struct tog_view *);
787 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
788     size_t *, int **, int **, int **, int **);
789 
790 static volatile sig_atomic_t tog_sigwinch_received;
791 static volatile sig_atomic_t tog_sigpipe_received;
792 static volatile sig_atomic_t tog_sigcont_received;
793 static volatile sig_atomic_t tog_sigint_received;
794 static volatile sig_atomic_t tog_sigterm_received;
795 
796 static void
797 tog_sigwinch(int signo)
798 {
799 	tog_sigwinch_received = 1;
800 }
801 
802 static void
803 tog_sigpipe(int signo)
804 {
805 	tog_sigpipe_received = 1;
806 }
807 
808 static void
809 tog_sigcont(int signo)
810 {
811 	tog_sigcont_received = 1;
812 }
813 
814 static void
815 tog_sigint(int signo)
816 {
817 	tog_sigint_received = 1;
818 }
819 
820 static void
821 tog_sigterm(int signo)
822 {
823 	tog_sigterm_received = 1;
824 }
825 
826 static int
827 tog_fatal_signal_received(void)
828 {
829 	return (tog_sigpipe_received ||
830 	    tog_sigint_received || tog_sigterm_received);
831 }
832 
833 static const struct got_error *
834 view_close(struct tog_view *view)
835 {
836 	const struct got_error *err = NULL, *child_err = NULL;
837 
838 	if (view->child) {
839 		child_err = view_close(view->child);
840 		view->child = NULL;
841 	}
842 	if (view->close)
843 		err = view->close(view);
844 	if (view->panel)
845 		del_panel(view->panel);
846 	if (view->window)
847 		delwin(view->window);
848 	free(view);
849 	return err ? err : child_err;
850 }
851 
852 static struct tog_view *
853 view_open(int nlines, int ncols, int begin_y, int begin_x,
854     enum tog_view_type type)
855 {
856 	struct tog_view *view = calloc(1, sizeof(*view));
857 
858 	if (view == NULL)
859 		return NULL;
860 
861 	view->type = type;
862 	view->lines = LINES;
863 	view->cols = COLS;
864 	view->nlines = nlines ? nlines : LINES - begin_y;
865 	view->ncols = ncols ? ncols : COLS - begin_x;
866 	view->begin_y = begin_y;
867 	view->begin_x = begin_x;
868 	view->window = newwin(nlines, ncols, begin_y, begin_x);
869 	if (view->window == NULL) {
870 		view_close(view);
871 		return NULL;
872 	}
873 	view->panel = new_panel(view->window);
874 	if (view->panel == NULL ||
875 	    set_panel_userptr(view->panel, view) != OK) {
876 		view_close(view);
877 		return NULL;
878 	}
879 
880 	keypad(view->window, TRUE);
881 	return view;
882 }
883 
884 static int
885 view_split_begin_x(int begin_x)
886 {
887 	if (begin_x > 0 || COLS < 120)
888 		return 0;
889 	return (COLS - MAX(COLS / 2, 80));
890 }
891 
892 /* XXX Stub till we decide what to do. */
893 static int
894 view_split_begin_y(int lines)
895 {
896 	return lines * HSPLIT_SCALE;
897 }
898 
899 static const struct got_error *view_resize(struct tog_view *);
900 
901 static const struct got_error *
902 view_splitscreen(struct tog_view *view)
903 {
904 	const struct got_error *err = NULL;
905 
906 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
907 		if (view->resized_y && view->resized_y < view->lines)
908 			view->begin_y = view->resized_y;
909 		else
910 			view->begin_y = view_split_begin_y(view->nlines);
911 		view->begin_x = 0;
912 	} else if (!view->resized) {
913 		if (view->resized_x && view->resized_x < view->cols - 1 &&
914 		    view->cols > 119)
915 			view->begin_x = view->resized_x;
916 		else
917 			view->begin_x = view_split_begin_x(0);
918 		view->begin_y = 0;
919 	}
920 	view->nlines = LINES - view->begin_y;
921 	view->ncols = COLS - view->begin_x;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 	err = view_resize(view);
925 	if (err)
926 		return err;
927 
928 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
929 		view->parent->nlines = view->begin_y;
930 
931 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
932 		return got_error_from_errno("mvwin");
933 
934 	return NULL;
935 }
936 
937 static const struct got_error *
938 view_fullscreen(struct tog_view *view)
939 {
940 	const struct got_error *err = NULL;
941 
942 	view->begin_x = 0;
943 	view->begin_y = view->resized ? view->begin_y : 0;
944 	view->nlines = view->resized ? view->nlines : LINES;
945 	view->ncols = COLS;
946 	view->lines = LINES;
947 	view->cols = COLS;
948 	err = view_resize(view);
949 	if (err)
950 		return err;
951 
952 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
953 		return got_error_from_errno("mvwin");
954 
955 	return NULL;
956 }
957 
958 static int
959 view_is_parent_view(struct tog_view *view)
960 {
961 	return view->parent == NULL;
962 }
963 
964 static int
965 view_is_splitscreen(struct tog_view *view)
966 {
967 	return view->begin_x > 0 || view->begin_y > 0;
968 }
969 
970 static int
971 view_is_fullscreen(struct tog_view *view)
972 {
973 	return view->nlines == LINES && view->ncols == COLS;
974 }
975 
976 static int
977 view_is_hsplit_top(struct tog_view *view)
978 {
979 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
980 	    view_is_splitscreen(view->child);
981 }
982 
983 static void
984 view_border(struct tog_view *view)
985 {
986 	PANEL *panel;
987 	const struct tog_view *view_above;
988 
989 	if (view->parent)
990 		return view_border(view->parent);
991 
992 	panel = panel_above(view->panel);
993 	if (panel == NULL)
994 		return;
995 
996 	view_above = panel_userptr(panel);
997 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
998 		mvwhline(view->window, view_above->begin_y - 1,
999 		    view->begin_x, ACS_HLINE, view->ncols);
1000 	else
1001 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1002 		    ACS_VLINE, view->nlines);
1003 }
1004 
1005 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1006 static const struct got_error *request_log_commits(struct tog_view *);
1007 static const struct got_error *offset_selection_down(struct tog_view *);
1008 static void offset_selection_up(struct tog_view *);
1009 static void view_get_split(struct tog_view *, int *, int *);
1010 
1011 static const struct got_error *
1012 view_resize(struct tog_view *view)
1013 {
1014 	const struct got_error	*err = NULL;
1015 	int			 dif, nlines, ncols;
1016 
1017 	dif = LINES - view->lines;  /* line difference */
1018 
1019 	if (view->lines > LINES)
1020 		nlines = view->nlines - (view->lines - LINES);
1021 	else
1022 		nlines = view->nlines + (LINES - view->lines);
1023 	if (view->cols > COLS)
1024 		ncols = view->ncols - (view->cols - COLS);
1025 	else
1026 		ncols = view->ncols + (COLS - view->cols);
1027 
1028 	if (view->child) {
1029 		int hs = view->child->begin_y;
1030 
1031 		if (!view_is_fullscreen(view))
1032 			view->child->begin_x = view_split_begin_x(view->begin_x);
1033 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1034 		    view->child->begin_x == 0) {
1035 			ncols = COLS;
1036 
1037 			view_fullscreen(view->child);
1038 			if (view->child->focussed)
1039 				show_panel(view->child->panel);
1040 			else
1041 				show_panel(view->panel);
1042 		} else {
1043 			ncols = view->child->begin_x;
1044 
1045 			view_splitscreen(view->child);
1046 			show_panel(view->child->panel);
1047 		}
1048 		/*
1049 		 * XXX This is ugly and needs to be moved into the above
1050 		 * logic but "works" for now and my attempts at moving it
1051 		 * break either 'tab' or 'F' key maps in horizontal splits.
1052 		 */
1053 		if (hs) {
1054 			err = view_splitscreen(view->child);
1055 			if (err)
1056 				return err;
1057 			if (dif < 0) { /* top split decreased */
1058 				err = offset_selection_down(view);
1059 				if (err)
1060 					return err;
1061 			}
1062 			view_border(view);
1063 			update_panels();
1064 			doupdate();
1065 			show_panel(view->child->panel);
1066 			nlines = view->nlines;
1067 		}
1068 	} else if (view->parent == NULL)
1069 		ncols = COLS;
1070 
1071 	if (view->resize && dif > 0) {
1072 		err = view->resize(view, dif);
1073 		if (err)
1074 			return err;
1075 	}
1076 
1077 	if (wresize(view->window, nlines, ncols) == ERR)
1078 		return got_error_from_errno("wresize");
1079 	if (replace_panel(view->panel, view->window) == ERR)
1080 		return got_error_from_errno("replace_panel");
1081 	wclear(view->window);
1082 
1083 	view->nlines = nlines;
1084 	view->ncols = ncols;
1085 	view->lines = LINES;
1086 	view->cols = COLS;
1087 
1088 	return NULL;
1089 }
1090 
1091 static const struct got_error *
1092 resize_log_view(struct tog_view *view, int increase)
1093 {
1094 	struct tog_log_view_state	*s = &view->state.log;
1095 	const struct got_error		*err = NULL;
1096 	int				 n = 0;
1097 
1098 	if (s->selected_entry)
1099 		n = s->selected_entry->idx + view->lines - s->selected;
1100 
1101 	/*
1102 	 * Request commits to account for the increased
1103 	 * height so we have enough to populate the view.
1104 	 */
1105 	if (s->commits->ncommits < n) {
1106 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1107 		err = request_log_commits(view);
1108 	}
1109 
1110 	return err;
1111 }
1112 
1113 static void
1114 view_adjust_offset(struct tog_view *view, int n)
1115 {
1116 	if (n == 0)
1117 		return;
1118 
1119 	if (view->parent && view->parent->offset) {
1120 		if (view->parent->offset + n >= 0)
1121 			view->parent->offset += n;
1122 		else
1123 			view->parent->offset = 0;
1124 	} else if (view->offset) {
1125 		if (view->offset - n >= 0)
1126 			view->offset -= n;
1127 		else
1128 			view->offset = 0;
1129 	}
1130 }
1131 
1132 static const struct got_error *
1133 view_resize_split(struct tog_view *view, int resize)
1134 {
1135 	const struct got_error	*err = NULL;
1136 	struct tog_view		*v = NULL;
1137 
1138 	if (view->parent)
1139 		v = view->parent;
1140 	else
1141 		v = view;
1142 
1143 	if (!v->child || !view_is_splitscreen(v->child))
1144 		return NULL;
1145 
1146 	v->resized = v->child->resized = resize;  /* lock for resize event */
1147 
1148 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1149 		if (v->child->resized_y)
1150 			v->child->begin_y = v->child->resized_y;
1151 		if (view->parent)
1152 			v->child->begin_y -= resize;
1153 		else
1154 			v->child->begin_y += resize;
1155 		if (v->child->begin_y < 3) {
1156 			view->count = 0;
1157 			v->child->begin_y = 3;
1158 		} else if (v->child->begin_y > LINES - 1) {
1159 			view->count = 0;
1160 			v->child->begin_y = LINES - 1;
1161 		}
1162 		v->ncols = COLS;
1163 		v->child->ncols = COLS;
1164 		view_adjust_offset(view, resize);
1165 		err = view_init_hsplit(v, v->child->begin_y);
1166 		if (err)
1167 			return err;
1168 		v->child->resized_y = v->child->begin_y;
1169 	} else {
1170 		if (v->child->resized_x)
1171 			v->child->begin_x = v->child->resized_x;
1172 		if (view->parent)
1173 			v->child->begin_x -= resize;
1174 		else
1175 			v->child->begin_x += resize;
1176 		if (v->child->begin_x < 11) {
1177 			view->count = 0;
1178 			v->child->begin_x = 11;
1179 		} else if (v->child->begin_x > COLS - 1) {
1180 			view->count = 0;
1181 			v->child->begin_x = COLS - 1;
1182 		}
1183 		v->child->resized_x = v->child->begin_x;
1184 	}
1185 
1186 	v->child->mode = v->mode;
1187 	v->child->nlines = v->lines - v->child->begin_y;
1188 	v->child->ncols = v->cols - v->child->begin_x;
1189 	v->focus_child = 1;
1190 
1191 	err = view_fullscreen(v);
1192 	if (err)
1193 		return err;
1194 	err = view_splitscreen(v->child);
1195 	if (err)
1196 		return err;
1197 
1198 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1199 		err = offset_selection_down(v->child);
1200 		if (err)
1201 			return err;
1202 	}
1203 
1204 	if (v->resize)
1205 		err = v->resize(v, 0);
1206 	else if (v->child->resize)
1207 		err = v->child->resize(v->child, 0);
1208 
1209 	v->resized = v->child->resized = 0;
1210 
1211 	return err;
1212 }
1213 
1214 static void
1215 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1216 {
1217 	struct tog_view *v = src->child ? src->child : src;
1218 
1219 	dst->resized_x = v->resized_x;
1220 	dst->resized_y = v->resized_y;
1221 }
1222 
1223 static const struct got_error *
1224 view_close_child(struct tog_view *view)
1225 {
1226 	const struct got_error *err = NULL;
1227 
1228 	if (view->child == NULL)
1229 		return NULL;
1230 
1231 	err = view_close(view->child);
1232 	view->child = NULL;
1233 	return err;
1234 }
1235 
1236 static const struct got_error *
1237 view_set_child(struct tog_view *view, struct tog_view *child)
1238 {
1239 	const struct got_error *err = NULL;
1240 
1241 	view->child = child;
1242 	child->parent = view;
1243 
1244 	err = view_resize(view);
1245 	if (err)
1246 		return err;
1247 
1248 	if (view->child->resized_x || view->child->resized_y)
1249 		err = view_resize_split(view, 0);
1250 
1251 	return err;
1252 }
1253 
1254 static const struct got_error *view_dispatch_request(struct tog_view **,
1255     struct tog_view *, enum tog_view_type, int, int);
1256 
1257 static const struct got_error *
1258 view_request_new(struct tog_view **requested, struct tog_view *view,
1259     enum tog_view_type request)
1260 {
1261 	struct tog_view		*new_view = NULL;
1262 	const struct got_error	*err;
1263 	int			 y = 0, x = 0;
1264 
1265 	*requested = NULL;
1266 
1267 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1268 		view_get_split(view, &y, &x);
1269 
1270 	err = view_dispatch_request(&new_view, view, request, y, x);
1271 	if (err)
1272 		return err;
1273 
1274 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1275 	    request != TOG_VIEW_HELP) {
1276 		err = view_init_hsplit(view, y);
1277 		if (err)
1278 			return err;
1279 	}
1280 
1281 	view->focussed = 0;
1282 	new_view->focussed = 1;
1283 	new_view->mode = view->mode;
1284 	new_view->nlines = request == TOG_VIEW_HELP ?
1285 	    view->lines : view->lines - y;
1286 
1287 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1288 		view_transfer_size(new_view, view);
1289 		err = view_close_child(view);
1290 		if (err)
1291 			return err;
1292 		err = view_set_child(view, new_view);
1293 		if (err)
1294 			return err;
1295 		view->focus_child = 1;
1296 	} else
1297 		*requested = new_view;
1298 
1299 	return NULL;
1300 }
1301 
1302 static void
1303 tog_resizeterm(void)
1304 {
1305 	int cols, lines;
1306 	struct winsize size;
1307 
1308 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1309 		cols = 80;     /* Default */
1310 		lines = 24;
1311 	} else {
1312 		cols = size.ws_col;
1313 		lines = size.ws_row;
1314 	}
1315 	resize_term(lines, cols);
1316 }
1317 
1318 static const struct got_error *
1319 view_search_start(struct tog_view *view, int fast_refresh)
1320 {
1321 	const struct got_error *err = NULL;
1322 	struct tog_view *v = view;
1323 	char pattern[1024];
1324 	int ret;
1325 
1326 	if (view->search_started) {
1327 		regfree(&view->regex);
1328 		view->searching = 0;
1329 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1330 	}
1331 	view->search_started = 0;
1332 
1333 	if (view->nlines < 1)
1334 		return NULL;
1335 
1336 	if (view_is_hsplit_top(view))
1337 		v = view->child;
1338 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1339 		v = view->parent;
1340 
1341 	if (tog_io.input_str != NULL) {
1342 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
1343 		    sizeof(pattern))
1344 			return got_error(GOT_ERR_NO_SPACE);
1345 	} else {
1346 		mvwaddstr(v->window, v->nlines - 1, 0, "/");
1347 		wclrtoeol(v->window);
1348 		nodelay(v->window, FALSE);  /* block for search term input */
1349 		nocbreak();
1350 		echo();
1351 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
1352 		wrefresh(v->window);
1353 		cbreak();
1354 		noecho();
1355 		nodelay(v->window, TRUE);
1356 		if (!fast_refresh && !using_mock_io)
1357 			halfdelay(10);
1358 		if (ret == ERR)
1359 			return NULL;
1360 	}
1361 
1362 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1363 		err = view->search_start(view);
1364 		if (err) {
1365 			regfree(&view->regex);
1366 			return err;
1367 		}
1368 		view->search_started = 1;
1369 		view->searching = TOG_SEARCH_FORWARD;
1370 		view->search_next_done = 0;
1371 		view->search_next(view);
1372 	}
1373 
1374 	return NULL;
1375 }
1376 
1377 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1378 static const struct got_error *
1379 switch_split(struct tog_view *view)
1380 {
1381 	const struct got_error	*err = NULL;
1382 	struct tog_view		*v = NULL;
1383 
1384 	if (view->parent)
1385 		v = view->parent;
1386 	else
1387 		v = view;
1388 
1389 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1390 		v->mode = TOG_VIEW_SPLIT_VERT;
1391 	else
1392 		v->mode = TOG_VIEW_SPLIT_HRZN;
1393 
1394 	if (!v->child)
1395 		return NULL;
1396 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1397 		v->mode = TOG_VIEW_SPLIT_NONE;
1398 
1399 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1401 		v->child->begin_y = v->child->resized_y;
1402 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1403 		v->child->begin_x = v->child->resized_x;
1404 
1405 
1406 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1407 		v->ncols = COLS;
1408 		v->child->ncols = COLS;
1409 		v->child->nscrolled = LINES - v->child->nlines;
1410 
1411 		err = view_init_hsplit(v, v->child->begin_y);
1412 		if (err)
1413 			return err;
1414 	}
1415 	v->child->mode = v->mode;
1416 	v->child->nlines = v->lines - v->child->begin_y;
1417 	v->focus_child = 1;
1418 
1419 	err = view_fullscreen(v);
1420 	if (err)
1421 		return err;
1422 	err = view_splitscreen(v->child);
1423 	if (err)
1424 		return err;
1425 
1426 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1427 		v->mode = TOG_VIEW_SPLIT_VERT;
1428 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1429 		err = offset_selection_down(v);
1430 		if (err)
1431 			return err;
1432 		err = offset_selection_down(v->child);
1433 		if (err)
1434 			return err;
1435 	} else {
1436 		offset_selection_up(v);
1437 		offset_selection_up(v->child);
1438 	}
1439 	if (v->resize)
1440 		err = v->resize(v, 0);
1441 	else if (v->child->resize)
1442 		err = v->child->resize(v->child, 0);
1443 
1444 	return err;
1445 }
1446 
1447 /*
1448  * Strip trailing whitespace from str starting at byte *n;
1449  * if *n < 0, use strlen(str). Return new str length in *n.
1450  */
1451 static void
1452 strip_trailing_ws(char *str, int *n)
1453 {
1454 	size_t x = *n;
1455 
1456 	if (str == NULL || *str == '\0')
1457 		return;
1458 
1459 	if (x < 0)
1460 		x = strlen(str);
1461 
1462 	while (x-- > 0 && isspace((unsigned char)str[x]))
1463 		str[x] = '\0';
1464 
1465 	*n = x + 1;
1466 }
1467 
1468 /*
1469  * Extract visible substring of line y from the curses screen
1470  * and strip trailing whitespace. If vline is set, overwrite
1471  * line[vline] with '|' because the ACS_VLINE character is
1472  * written out as 'x'. Write the line to file f.
1473  */
1474 static const struct got_error *
1475 view_write_line(FILE *f, int y, int vline)
1476 {
1477 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1478 	int	r, w;
1479 
1480 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1481 	if (r == ERR)
1482 		return got_error_fmt(GOT_ERR_RANGE,
1483 		    "failed to extract line %d", y);
1484 
1485 	/*
1486 	 * In some views, lines are padded with blanks to COLS width.
1487 	 * Strip them so we can diff without the -b flag when testing.
1488 	 */
1489 	strip_trailing_ws(line, &r);
1490 
1491 	if (vline > 0)
1492 		line[vline] = '|';
1493 
1494 	w = fprintf(f, "%s\n", line);
1495 	if (w != r + 1)		/* \n */
1496 		return got_ferror(f, GOT_ERR_IO);
1497 
1498 	return NULL;
1499 }
1500 
1501 /*
1502  * Capture the visible curses screen by writing each line to the
1503  * file at the path set via the TOG_SCR_DUMP environment variable.
1504  */
1505 static const struct got_error *
1506 screendump(struct tog_view *view)
1507 {
1508 	const struct got_error	*err;
1509 	int			 i;
1510 
1511 	err = got_opentemp_truncate(tog_io.sdump);
1512 	if (err)
1513 		return err;
1514 
1515 	if ((view->child && view->child->begin_x) ||
1516 	    (view->parent && view->begin_x)) {
1517 		int ncols = view->child ? view->ncols : view->parent->ncols;
1518 
1519 		/* vertical splitscreen */
1520 		for (i = 0; i < view->nlines; ++i) {
1521 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1522 			if (err)
1523 				goto done;
1524 		}
1525 	} else {
1526 		int hline = 0;
1527 
1528 		/* fullscreen or horizontal splitscreen */
1529 		if ((view->child && view->child->begin_y) ||
1530 		    (view->parent && view->begin_y))	/* hsplit */
1531 			hline = view->child ?
1532 			    view->child->begin_y : view->begin_y;
1533 
1534 		for (i = 0; i < view->lines; i++) {
1535 			if (hline && i == hline - 1) {
1536 				int c;
1537 
1538 				/* ACS_HLINE writes out as 'q', overwrite it */
1539 				for (c = 0; c < view->cols; ++c)
1540 					fputc('-', tog_io.sdump);
1541 				fputc('\n', tog_io.sdump);
1542 				continue;
1543 			}
1544 
1545 			err = view_write_line(tog_io.sdump, i, 0);
1546 			if (err)
1547 				goto done;
1548 		}
1549 	}
1550 
1551 done:
1552 	return err;
1553 }
1554 
1555 /*
1556  * Compute view->count from numeric input. Assign total to view->count and
1557  * return first non-numeric key entered.
1558  */
1559 static int
1560 get_compound_key(struct tog_view *view, int c)
1561 {
1562 	struct tog_view	*v = view;
1563 	int		 x, n = 0;
1564 
1565 	if (view_is_hsplit_top(view))
1566 		v = view->child;
1567 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1568 		v = view->parent;
1569 
1570 	view->count = 0;
1571 	cbreak();  /* block for input */
1572 	nodelay(view->window, FALSE);
1573 	wmove(v->window, v->nlines - 1, 0);
1574 	wclrtoeol(v->window);
1575 	waddch(v->window, ':');
1576 
1577 	do {
1578 		x = getcurx(v->window);
1579 		if (x != ERR && x < view->ncols) {
1580 			waddch(v->window, c);
1581 			wrefresh(v->window);
1582 		}
1583 
1584 		/*
1585 		 * Don't overflow. Max valid request should be the greatest
1586 		 * between the longest and total lines; cap at 10 million.
1587 		 */
1588 		if (n >= 9999999)
1589 			n = 9999999;
1590 		else
1591 			n = n * 10 + (c - '0');
1592 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1593 
1594 	if (c == 'G' || c == 'g') {	/* nG key map */
1595 		view->gline = view->hiline = n;
1596 		n = 0;
1597 		c = 0;
1598 	}
1599 
1600 	/* Massage excessive or inapplicable values at the input handler. */
1601 	view->count = n;
1602 
1603 	return c;
1604 }
1605 
1606 static void
1607 action_report(struct tog_view *view)
1608 {
1609 	struct tog_view *v = view;
1610 
1611 	if (view_is_hsplit_top(view))
1612 		v = view->child;
1613 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1614 		v = view->parent;
1615 
1616 	wmove(v->window, v->nlines - 1, 0);
1617 	wclrtoeol(v->window);
1618 	wprintw(v->window, ":%s", view->action);
1619 	wrefresh(v->window);
1620 
1621 	/*
1622 	 * Clear action status report. Only clear in blame view
1623 	 * once annotating is complete, otherwise it's too fast.
1624 	 */
1625 	if (view->type == TOG_VIEW_BLAME) {
1626 		if (view->state.blame.blame_complete)
1627 			view->action = NULL;
1628 	} else
1629 		view->action = NULL;
1630 }
1631 
1632 /*
1633  * Read the next line from the test script and assign
1634  * key instruction to *ch. If at EOF, set the *done flag.
1635  */
1636 static const struct got_error *
1637 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1638 {
1639 	const struct got_error	*err = NULL;
1640 	char			*line = NULL;
1641 	size_t			 linesz = 0;
1642 	ssize_t			 n;
1643 
1644 
1645 	if (view->count && --view->count) {
1646 		*ch = view->ch;
1647 		return NULL;
1648 	} else
1649 		*ch = -1;
1650 
1651 	if ((n = getline(&line, &linesz, script)) == -1) {
1652 		if (feof(script)) {
1653 			*done = 1;
1654 			goto done;
1655 		} else {
1656 			err = got_ferror(script, GOT_ERR_IO);
1657 			goto done;
1658 		}
1659 	}
1660 
1661 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1662 		tog_io.wait_for_ui = 1;
1663 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1664 		*ch = KEY_ENTER;
1665 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1666 		*ch = KEY_RIGHT;
1667 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1668 		*ch = KEY_LEFT;
1669 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1670 		*ch = KEY_DOWN;
1671 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1672 		*ch = KEY_UP;
1673 	else if (strncasecmp(line, "TAB", 3) == 0)
1674 		*ch = '\t';
1675 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1676 		*ch = TOG_KEY_SCRDUMP;
1677 	else if (isdigit((unsigned char)*line)) {
1678 		char *t = line;
1679 
1680 		while (isdigit((unsigned char)*t))
1681 			++t;
1682 		view->ch = *ch = *t;
1683 		*t = '\0';
1684 		/* ignore error, view->count is 0 if instruction is invalid */
1685 		view->count = strtonum(line, 0, INT_MAX, NULL);
1686 	} else {
1687 		*ch = *line;
1688 		if (n > 2 && (*ch == '/' || *ch == '&')) {
1689 			/* skip leading keymap and trim trailing newline */
1690 			tog_io.input_str = strndup(line + 1, n - 2);
1691 			if (tog_io.input_str == NULL) {
1692 				err = got_error_from_errno("strndup");
1693 				goto done;
1694 			}
1695 		}
1696 	}
1697 
1698 done:
1699 	free(line);
1700 	return err;
1701 }
1702 
1703 static const struct got_error *
1704 view_input(struct tog_view **new, int *done, struct tog_view *view,
1705     struct tog_view_list_head *views, int fast_refresh)
1706 {
1707 	const struct got_error *err = NULL;
1708 	struct tog_view *v;
1709 	int ch, errcode;
1710 
1711 	*new = NULL;
1712 
1713 	if (view->action)
1714 		action_report(view);
1715 
1716 	/* Clear "no matches" indicator. */
1717 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1718 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1719 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1720 		view->count = 0;
1721 	}
1722 
1723 	if (view->searching && !view->search_next_done) {
1724 		errcode = pthread_mutex_unlock(&tog_mutex);
1725 		if (errcode)
1726 			return got_error_set_errno(errcode,
1727 			    "pthread_mutex_unlock");
1728 		sched_yield();
1729 		errcode = pthread_mutex_lock(&tog_mutex);
1730 		if (errcode)
1731 			return got_error_set_errno(errcode,
1732 			    "pthread_mutex_lock");
1733 		view->search_next(view);
1734 		return NULL;
1735 	}
1736 
1737 	/* Allow threads to make progress while we are waiting for input. */
1738 	errcode = pthread_mutex_unlock(&tog_mutex);
1739 	if (errcode)
1740 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1741 
1742 	if (using_mock_io) {
1743 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1744 		if (err) {
1745 			errcode = pthread_mutex_lock(&tog_mutex);
1746 			return err;
1747 		}
1748 	} else if (view->count && --view->count) {
1749 		cbreak();
1750 		nodelay(view->window, TRUE);
1751 		ch = wgetch(view->window);
1752 		/* let C-g or backspace abort unfinished count */
1753 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1754 			view->count = 0;
1755 		else
1756 			ch = view->ch;
1757 	} else {
1758 		ch = wgetch(view->window);
1759 		if (ch >= '1' && ch  <= '9')
1760 			view->ch = ch = get_compound_key(view, ch);
1761 	}
1762 	if (view->hiline && ch != ERR && ch != 0)
1763 		view->hiline = 0;  /* key pressed, clear line highlight */
1764 	nodelay(view->window, TRUE);
1765 	errcode = pthread_mutex_lock(&tog_mutex);
1766 	if (errcode)
1767 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1768 
1769 	if (tog_sigwinch_received || tog_sigcont_received) {
1770 		tog_resizeterm();
1771 		tog_sigwinch_received = 0;
1772 		tog_sigcont_received = 0;
1773 		TAILQ_FOREACH(v, views, entry) {
1774 			err = view_resize(v);
1775 			if (err)
1776 				return err;
1777 			err = v->input(new, v, KEY_RESIZE);
1778 			if (err)
1779 				return err;
1780 			if (v->child) {
1781 				err = view_resize(v->child);
1782 				if (err)
1783 					return err;
1784 				err = v->child->input(new, v->child,
1785 				    KEY_RESIZE);
1786 				if (err)
1787 					return err;
1788 				if (v->child->resized_x || v->child->resized_y) {
1789 					err = view_resize_split(v, 0);
1790 					if (err)
1791 						return err;
1792 				}
1793 			}
1794 		}
1795 	}
1796 
1797 	switch (ch) {
1798 	case '?':
1799 	case 'H':
1800 	case KEY_F(1):
1801 		if (view->type == TOG_VIEW_HELP)
1802 			err = view->reset(view);
1803 		else
1804 			err = view_request_new(new, view, TOG_VIEW_HELP);
1805 		break;
1806 	case '\t':
1807 		view->count = 0;
1808 		if (view->child) {
1809 			view->focussed = 0;
1810 			view->child->focussed = 1;
1811 			view->focus_child = 1;
1812 		} else if (view->parent) {
1813 			view->focussed = 0;
1814 			view->parent->focussed = 1;
1815 			view->parent->focus_child = 0;
1816 			if (!view_is_splitscreen(view)) {
1817 				if (view->parent->resize) {
1818 					err = view->parent->resize(view->parent,
1819 					    0);
1820 					if (err)
1821 						return err;
1822 				}
1823 				offset_selection_up(view->parent);
1824 				err = view_fullscreen(view->parent);
1825 				if (err)
1826 					return err;
1827 			}
1828 		}
1829 		break;
1830 	case 'q':
1831 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1832 			if (view->parent->resize) {
1833 				/* might need more commits to fill fullscreen */
1834 				err = view->parent->resize(view->parent, 0);
1835 				if (err)
1836 					break;
1837 			}
1838 			offset_selection_up(view->parent);
1839 		}
1840 		err = view->input(new, view, ch);
1841 		view->dying = 1;
1842 		break;
1843 	case 'Q':
1844 		*done = 1;
1845 		break;
1846 	case 'F':
1847 		view->count = 0;
1848 		if (view_is_parent_view(view)) {
1849 			if (view->child == NULL)
1850 				break;
1851 			if (view_is_splitscreen(view->child)) {
1852 				view->focussed = 0;
1853 				view->child->focussed = 1;
1854 				err = view_fullscreen(view->child);
1855 			} else {
1856 				err = view_splitscreen(view->child);
1857 				if (!err)
1858 					err = view_resize_split(view, 0);
1859 			}
1860 			if (err)
1861 				break;
1862 			err = view->child->input(new, view->child,
1863 			    KEY_RESIZE);
1864 		} else {
1865 			if (view_is_splitscreen(view)) {
1866 				view->parent->focussed = 0;
1867 				view->focussed = 1;
1868 				err = view_fullscreen(view);
1869 			} else {
1870 				err = view_splitscreen(view);
1871 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1872 					err = view_resize(view->parent);
1873 				if (!err)
1874 					err = view_resize_split(view, 0);
1875 			}
1876 			if (err)
1877 				break;
1878 			err = view->input(new, view, KEY_RESIZE);
1879 		}
1880 		if (err)
1881 			break;
1882 		if (view->resize) {
1883 			err = view->resize(view, 0);
1884 			if (err)
1885 				break;
1886 		}
1887 		if (view->parent) {
1888 			if (view->parent->resize) {
1889 				err = view->parent->resize(view->parent, 0);
1890 				if (err != NULL)
1891 					break;
1892 			}
1893 			err = offset_selection_down(view->parent);
1894 			if (err != NULL)
1895 				break;
1896 		}
1897 		err = offset_selection_down(view);
1898 		break;
1899 	case 'S':
1900 		view->count = 0;
1901 		err = switch_split(view);
1902 		break;
1903 	case '-':
1904 		err = view_resize_split(view, -1);
1905 		break;
1906 	case '+':
1907 		err = view_resize_split(view, 1);
1908 		break;
1909 	case KEY_RESIZE:
1910 		break;
1911 	case '/':
1912 		view->count = 0;
1913 		if (view->search_start)
1914 			view_search_start(view, fast_refresh);
1915 		else
1916 			err = view->input(new, view, ch);
1917 		break;
1918 	case 'N':
1919 	case 'n':
1920 		if (view->search_started && view->search_next) {
1921 			view->searching = (ch == 'n' ?
1922 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1923 			view->search_next_done = 0;
1924 			view->search_next(view);
1925 		} else
1926 			err = view->input(new, view, ch);
1927 		break;
1928 	case 'A':
1929 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1930 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1931 			view->action = "Patience diff algorithm";
1932 		} else {
1933 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1934 			view->action = "Myers diff algorithm";
1935 		}
1936 		TAILQ_FOREACH(v, views, entry) {
1937 			if (v->reset) {
1938 				err = v->reset(v);
1939 				if (err)
1940 					return err;
1941 			}
1942 			if (v->child && v->child->reset) {
1943 				err = v->child->reset(v->child);
1944 				if (err)
1945 					return err;
1946 			}
1947 		}
1948 		break;
1949 	case TOG_KEY_SCRDUMP:
1950 		err = screendump(view);
1951 		break;
1952 	default:
1953 		err = view->input(new, view, ch);
1954 		break;
1955 	}
1956 
1957 	return err;
1958 }
1959 
1960 static int
1961 view_needs_focus_indication(struct tog_view *view)
1962 {
1963 	if (view_is_parent_view(view)) {
1964 		if (view->child == NULL || view->child->focussed)
1965 			return 0;
1966 		if (!view_is_splitscreen(view->child))
1967 			return 0;
1968 	} else if (!view_is_splitscreen(view))
1969 		return 0;
1970 
1971 	return view->focussed;
1972 }
1973 
1974 static const struct got_error *
1975 tog_io_close(void)
1976 {
1977 	const struct got_error *err = NULL;
1978 
1979 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1980 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1981 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1982 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1983 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1984 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1985 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1986 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1987 	if (tog_io.input_str != NULL)
1988 		free(tog_io.input_str);
1989 
1990 	return err;
1991 }
1992 
1993 static const struct got_error *
1994 view_loop(struct tog_view *view)
1995 {
1996 	const struct got_error *err = NULL;
1997 	struct tog_view_list_head views;
1998 	struct tog_view *new_view;
1999 	char *mode;
2000 	int fast_refresh = 10;
2001 	int done = 0, errcode;
2002 
2003 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2004 	if (!mode || !(*mode == 'h' || *mode == 'H'))
2005 		view->mode = TOG_VIEW_SPLIT_VERT;
2006 	else
2007 		view->mode = TOG_VIEW_SPLIT_HRZN;
2008 
2009 	errcode = pthread_mutex_lock(&tog_mutex);
2010 	if (errcode)
2011 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2012 
2013 	TAILQ_INIT(&views);
2014 	TAILQ_INSERT_HEAD(&views, view, entry);
2015 
2016 	view->focussed = 1;
2017 	err = view->show(view);
2018 	if (err)
2019 		return err;
2020 	update_panels();
2021 	doupdate();
2022 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2023 	    !tog_fatal_signal_received()) {
2024 		/* Refresh fast during initialization, then become slower. */
2025 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2026 			halfdelay(10); /* switch to once per second */
2027 
2028 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2029 		if (err)
2030 			break;
2031 
2032 		if (view->dying && view == TAILQ_FIRST(&views) &&
2033 		    TAILQ_NEXT(view, entry) == NULL)
2034 			done = 1;
2035 		if (done) {
2036 			struct tog_view *v;
2037 
2038 			/*
2039 			 * When we quit, scroll the screen up a single line
2040 			 * so we don't lose any information.
2041 			 */
2042 			TAILQ_FOREACH(v, &views, entry) {
2043 				wmove(v->window, 0, 0);
2044 				wdeleteln(v->window);
2045 				wnoutrefresh(v->window);
2046 				if (v->child && !view_is_fullscreen(v)) {
2047 					wmove(v->child->window, 0, 0);
2048 					wdeleteln(v->child->window);
2049 					wnoutrefresh(v->child->window);
2050 				}
2051 			}
2052 			doupdate();
2053 		}
2054 
2055 		if (view->dying) {
2056 			struct tog_view *v, *prev = NULL;
2057 
2058 			if (view_is_parent_view(view))
2059 				prev = TAILQ_PREV(view, tog_view_list_head,
2060 				    entry);
2061 			else if (view->parent)
2062 				prev = view->parent;
2063 
2064 			if (view->parent) {
2065 				view->parent->child = NULL;
2066 				view->parent->focus_child = 0;
2067 				/* Restore fullscreen line height. */
2068 				view->parent->nlines = view->parent->lines;
2069 				err = view_resize(view->parent);
2070 				if (err)
2071 					break;
2072 				/* Make resized splits persist. */
2073 				view_transfer_size(view->parent, view);
2074 			} else
2075 				TAILQ_REMOVE(&views, view, entry);
2076 
2077 			err = view_close(view);
2078 			if (err)
2079 				goto done;
2080 
2081 			view = NULL;
2082 			TAILQ_FOREACH(v, &views, entry) {
2083 				if (v->focussed)
2084 					break;
2085 			}
2086 			if (view == NULL && new_view == NULL) {
2087 				/* No view has focus. Try to pick one. */
2088 				if (prev)
2089 					view = prev;
2090 				else if (!TAILQ_EMPTY(&views)) {
2091 					view = TAILQ_LAST(&views,
2092 					    tog_view_list_head);
2093 				}
2094 				if (view) {
2095 					if (view->focus_child) {
2096 						view->child->focussed = 1;
2097 						view = view->child;
2098 					} else
2099 						view->focussed = 1;
2100 				}
2101 			}
2102 		}
2103 		if (new_view) {
2104 			struct tog_view *v, *t;
2105 			/* Only allow one parent view per type. */
2106 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2107 				if (v->type != new_view->type)
2108 					continue;
2109 				TAILQ_REMOVE(&views, v, entry);
2110 				err = view_close(v);
2111 				if (err)
2112 					goto done;
2113 				break;
2114 			}
2115 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2116 			view = new_view;
2117 		}
2118 		if (view && !done) {
2119 			if (view_is_parent_view(view)) {
2120 				if (view->child && view->child->focussed)
2121 					view = view->child;
2122 			} else {
2123 				if (view->parent && view->parent->focussed)
2124 					view = view->parent;
2125 			}
2126 			show_panel(view->panel);
2127 			if (view->child && view_is_splitscreen(view->child))
2128 				show_panel(view->child->panel);
2129 			if (view->parent && view_is_splitscreen(view)) {
2130 				err = view->parent->show(view->parent);
2131 				if (err)
2132 					goto done;
2133 			}
2134 			err = view->show(view);
2135 			if (err)
2136 				goto done;
2137 			if (view->child) {
2138 				err = view->child->show(view->child);
2139 				if (err)
2140 					goto done;
2141 			}
2142 			update_panels();
2143 			doupdate();
2144 		}
2145 	}
2146 done:
2147 	while (!TAILQ_EMPTY(&views)) {
2148 		const struct got_error *close_err;
2149 		view = TAILQ_FIRST(&views);
2150 		TAILQ_REMOVE(&views, view, entry);
2151 		close_err = view_close(view);
2152 		if (close_err && err == NULL)
2153 			err = close_err;
2154 	}
2155 
2156 	errcode = pthread_mutex_unlock(&tog_mutex);
2157 	if (errcode && err == NULL)
2158 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2159 
2160 	return err;
2161 }
2162 
2163 __dead static void
2164 usage_log(void)
2165 {
2166 	endwin();
2167 	fprintf(stderr,
2168 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2169 	    getprogname());
2170 	exit(1);
2171 }
2172 
2173 /* Create newly allocated wide-character string equivalent to a byte string. */
2174 static const struct got_error *
2175 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2176 {
2177 	char *vis = NULL;
2178 	const struct got_error *err = NULL;
2179 
2180 	*ws = NULL;
2181 	*wlen = mbstowcs(NULL, s, 0);
2182 	if (*wlen == (size_t)-1) {
2183 		int vislen;
2184 		if (errno != EILSEQ)
2185 			return got_error_from_errno("mbstowcs");
2186 
2187 		/* byte string invalid in current encoding; try to "fix" it */
2188 		err = got_mbsavis(&vis, &vislen, s);
2189 		if (err)
2190 			return err;
2191 		*wlen = mbstowcs(NULL, vis, 0);
2192 		if (*wlen == (size_t)-1) {
2193 			err = got_error_from_errno("mbstowcs"); /* give up */
2194 			goto done;
2195 		}
2196 	}
2197 
2198 	*ws = calloc(*wlen + 1, sizeof(**ws));
2199 	if (*ws == NULL) {
2200 		err = got_error_from_errno("calloc");
2201 		goto done;
2202 	}
2203 
2204 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2205 		err = got_error_from_errno("mbstowcs");
2206 done:
2207 	free(vis);
2208 	if (err) {
2209 		free(*ws);
2210 		*ws = NULL;
2211 		*wlen = 0;
2212 	}
2213 	return err;
2214 }
2215 
2216 static const struct got_error *
2217 expand_tab(char **ptr, const char *src)
2218 {
2219 	char	*dst;
2220 	size_t	 len, n, idx = 0, sz = 0;
2221 
2222 	*ptr = NULL;
2223 	n = len = strlen(src);
2224 	dst = malloc(n + 1);
2225 	if (dst == NULL)
2226 		return got_error_from_errno("malloc");
2227 
2228 	while (idx < len && src[idx]) {
2229 		const char c = src[idx];
2230 
2231 		if (c == '\t') {
2232 			size_t nb = TABSIZE - sz % TABSIZE;
2233 			char *p;
2234 
2235 			p = realloc(dst, n + nb);
2236 			if (p == NULL) {
2237 				free(dst);
2238 				return got_error_from_errno("realloc");
2239 
2240 			}
2241 			dst = p;
2242 			n += nb;
2243 			memset(dst + sz, ' ', nb);
2244 			sz += nb;
2245 		} else
2246 			dst[sz++] = src[idx];
2247 		++idx;
2248 	}
2249 
2250 	dst[sz] = '\0';
2251 	*ptr = dst;
2252 	return NULL;
2253 }
2254 
2255 /*
2256  * Advance at most n columns from wline starting at offset off.
2257  * Return the index to the first character after the span operation.
2258  * Return the combined column width of all spanned wide characters in
2259  * *rcol.
2260  */
2261 static int
2262 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2263 {
2264 	int width, i, cols = 0;
2265 
2266 	if (n == 0) {
2267 		*rcol = cols;
2268 		return off;
2269 	}
2270 
2271 	for (i = off; wline[i] != L'\0'; ++i) {
2272 		if (wline[i] == L'\t')
2273 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2274 		else
2275 			width = wcwidth(wline[i]);
2276 
2277 		if (width == -1) {
2278 			width = 1;
2279 			wline[i] = L'.';
2280 		}
2281 
2282 		if (cols + width > n)
2283 			break;
2284 		cols += width;
2285 	}
2286 
2287 	*rcol = cols;
2288 	return i;
2289 }
2290 
2291 /*
2292  * Format a line for display, ensuring that it won't overflow a width limit.
2293  * With scrolling, the width returned refers to the scrolled version of the
2294  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2295  */
2296 static const struct got_error *
2297 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2298     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2299 {
2300 	const struct got_error *err = NULL;
2301 	int cols;
2302 	wchar_t *wline = NULL;
2303 	char *exstr = NULL;
2304 	size_t wlen;
2305 	int i, scrollx;
2306 
2307 	*wlinep = NULL;
2308 	*widthp = 0;
2309 
2310 	if (expand) {
2311 		err = expand_tab(&exstr, line);
2312 		if (err)
2313 			return err;
2314 	}
2315 
2316 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2317 	free(exstr);
2318 	if (err)
2319 		return err;
2320 
2321 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2322 
2323 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2324 		wline[wlen - 1] = L'\0';
2325 		wlen--;
2326 	}
2327 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2328 		wline[wlen - 1] = L'\0';
2329 		wlen--;
2330 	}
2331 
2332 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2333 	wline[i] = L'\0';
2334 
2335 	if (widthp)
2336 		*widthp = cols;
2337 	if (scrollxp)
2338 		*scrollxp = scrollx;
2339 	if (err)
2340 		free(wline);
2341 	else
2342 		*wlinep = wline;
2343 	return err;
2344 }
2345 
2346 static const struct got_error*
2347 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2348     struct got_object_id *id, struct got_repository *repo)
2349 {
2350 	static const struct got_error *err = NULL;
2351 	struct got_reflist_entry *re;
2352 	char *s;
2353 	const char *name;
2354 
2355 	*refs_str = NULL;
2356 
2357 	if (refs == NULL)
2358 		return NULL;
2359 
2360 	TAILQ_FOREACH(re, refs, entry) {
2361 		struct got_tag_object *tag = NULL;
2362 		struct got_object_id *ref_id;
2363 		int cmp;
2364 
2365 		name = got_ref_get_name(re->ref);
2366 		if (strcmp(name, GOT_REF_HEAD) == 0)
2367 			continue;
2368 		if (strncmp(name, "refs/", 5) == 0)
2369 			name += 5;
2370 		if (strncmp(name, "got/", 4) == 0)
2371 			continue;
2372 		if (strncmp(name, "heads/", 6) == 0)
2373 			name += 6;
2374 		if (strncmp(name, "remotes/", 8) == 0) {
2375 			name += 8;
2376 			s = strstr(name, "/" GOT_REF_HEAD);
2377 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2378 				continue;
2379 		}
2380 		err = got_ref_resolve(&ref_id, repo, re->ref);
2381 		if (err)
2382 			break;
2383 		if (strncmp(name, "tags/", 5) == 0) {
2384 			err = got_object_open_as_tag(&tag, repo, ref_id);
2385 			if (err) {
2386 				if (err->code != GOT_ERR_OBJ_TYPE) {
2387 					free(ref_id);
2388 					break;
2389 				}
2390 				/* Ref points at something other than a tag. */
2391 				err = NULL;
2392 				tag = NULL;
2393 			}
2394 		}
2395 		cmp = got_object_id_cmp(tag ?
2396 		    got_object_tag_get_object_id(tag) : ref_id, id);
2397 		free(ref_id);
2398 		if (tag)
2399 			got_object_tag_close(tag);
2400 		if (cmp != 0)
2401 			continue;
2402 		s = *refs_str;
2403 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2404 		    s ? ", " : "", name) == -1) {
2405 			err = got_error_from_errno("asprintf");
2406 			free(s);
2407 			*refs_str = NULL;
2408 			break;
2409 		}
2410 		free(s);
2411 	}
2412 
2413 	return err;
2414 }
2415 
2416 static const struct got_error *
2417 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2418     int col_tab_align)
2419 {
2420 	char *smallerthan;
2421 
2422 	smallerthan = strchr(author, '<');
2423 	if (smallerthan && smallerthan[1] != '\0')
2424 		author = smallerthan + 1;
2425 	author[strcspn(author, "@>")] = '\0';
2426 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2427 	    col_tab_align, 0);
2428 }
2429 
2430 static const struct got_error *
2431 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2432     const size_t date_display_cols, int author_display_cols)
2433 {
2434 	struct tog_log_view_state *s = &view->state.log;
2435 	const struct got_error *err = NULL;
2436 	struct got_commit_object *commit = entry->commit;
2437 	struct got_object_id *id = entry->id;
2438 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2439 	char *refs_str = NULL;
2440 	char *logmsg0 = NULL, *logmsg = NULL;
2441 	char *author = NULL;
2442 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2443 	int author_width, refstr_width, logmsg_width;
2444 	char *newline, *line = NULL;
2445 	int col, limit, scrollx, logmsg_x;
2446 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2447 	struct tm tm;
2448 	time_t committer_time;
2449 	struct tog_color *tc;
2450 	struct got_reflist_head *refs;
2451 
2452 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2453 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2454 		tog_base_commit.idx = entry->idx;
2455 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2456 		int rc;
2457 
2458 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2459 		if (rc)
2460 			return got_error_set_errno(rc, "pthread_cond_wait");
2461 	}
2462 
2463 	committer_time = got_object_commit_get_committer_time(commit);
2464 	if (gmtime_r(&committer_time, &tm) == NULL)
2465 		return got_error_from_errno("gmtime_r");
2466 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2467 		return got_error(GOT_ERR_NO_SPACE);
2468 
2469 	if (avail <= date_display_cols)
2470 		limit = MIN(sizeof(datebuf) - 1, avail);
2471 	else
2472 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2473 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2474 	if (tc)
2475 		wattr_on(view->window,
2476 		    COLOR_PAIR(tc->colorpair), NULL);
2477 	waddnstr(view->window, datebuf, limit);
2478 	if (tc)
2479 		wattr_off(view->window,
2480 		    COLOR_PAIR(tc->colorpair), NULL);
2481 	col = limit;
2482 	if (col > avail)
2483 		goto done;
2484 
2485 	if (avail >= 120) {
2486 		char *id_str;
2487 		err = got_object_id_str(&id_str, id);
2488 		if (err)
2489 			goto done;
2490 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2491 		if (tc)
2492 			wattr_on(view->window,
2493 			    COLOR_PAIR(tc->colorpair), NULL);
2494 		wprintw(view->window, "%.8s ", id_str);
2495 		if (tc)
2496 			wattr_off(view->window,
2497 			    COLOR_PAIR(tc->colorpair), NULL);
2498 		free(id_str);
2499 		col += 9;
2500 		if (col > avail)
2501 			goto done;
2502 	}
2503 
2504 	if (s->use_committer)
2505 		author = strdup(got_object_commit_get_committer(commit));
2506 	else
2507 		author = strdup(got_object_commit_get_author(commit));
2508 	if (author == NULL) {
2509 		err = got_error_from_errno("strdup");
2510 		goto done;
2511 	}
2512 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2513 	if (err)
2514 		goto done;
2515 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2516 	if (tc)
2517 		wattr_on(view->window,
2518 		    COLOR_PAIR(tc->colorpair), NULL);
2519 	waddwstr(view->window, wauthor);
2520 	col += author_width;
2521 	while (col < avail && author_width < author_display_cols + 2) {
2522 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2523 		    author_width == marker_column &&
2524 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2525 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2526 			if (tc)
2527 				wattr_on(view->window,
2528 				    COLOR_PAIR(tc->colorpair), NULL);
2529 			waddch(view->window, tog_base_commit.marker);
2530 			if (tc)
2531 				wattr_off(view->window,
2532 				    COLOR_PAIR(tc->colorpair), NULL);
2533 		} else
2534 			waddch(view->window, ' ');
2535 		col++;
2536 		author_width++;
2537 	}
2538 	if (tc)
2539 		wattr_off(view->window,
2540 		    COLOR_PAIR(tc->colorpair), NULL);
2541 	if (col > avail)
2542 		goto done;
2543 
2544 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2545 	if (err)
2546 		goto done;
2547 	logmsg = logmsg0;
2548 	while (*logmsg == '\n')
2549 		logmsg++;
2550 	newline = strchr(logmsg, '\n');
2551 	if (newline)
2552 		*newline = '\0';
2553 
2554 	limit = avail - col;
2555 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2556 		limit--;	/* for the border */
2557 
2558 	/* Prepend reference labels to log message if possible .*/
2559 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2560 	err = build_refs_str(&refs_str, refs, id, s->repo);
2561 	if (err)
2562 		goto done;
2563 	if (refs_str) {
2564 		char *rs;
2565 
2566 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2567 			err = got_error_from_errno("asprintf");
2568 			goto done;
2569 		}
2570 		err = format_line(&wrefstr, &refstr_width,
2571 		    &scrollx, rs, view->x, limit, col, 1);
2572 		free(rs);
2573 		if (err)
2574 			goto done;
2575 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2576 		if (tc)
2577 			wattr_on(view->window,
2578 			    COLOR_PAIR(tc->colorpair), NULL);
2579 		waddwstr(view->window, &wrefstr[scrollx]);
2580 		if (tc)
2581 			wattr_off(view->window,
2582 			    COLOR_PAIR(tc->colorpair), NULL);
2583 		col += MAX(refstr_width, 0);
2584 		if (col > avail)
2585 			goto done;
2586 
2587 		if (col < avail) {
2588 			waddch(view->window, ' ');
2589 			col++;
2590 		}
2591 
2592 		if (refstr_width > 0)
2593 			logmsg_x = 0;
2594 		else {
2595 			int unscrolled_refstr_width;
2596 			size_t len = wcslen(wrefstr);
2597 
2598 			/*
2599 			 * No need to check for -1 return value here since
2600 			 * unprintables have been replaced by span_wline().
2601 			 */
2602 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2603 			unscrolled_refstr_width += 1; /* trailing space */
2604 			logmsg_x = view->x - unscrolled_refstr_width;
2605 		}
2606 
2607 		limit = avail - col;
2608 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2609 			limit--;	/* for the border */
2610 	} else
2611 		logmsg_x = view->x;
2612 
2613 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2614 	    limit, col, 1);
2615 	if (err)
2616 		goto done;
2617 	waddwstr(view->window, &wlogmsg[scrollx]);
2618 	col += MAX(logmsg_width, 0);
2619 	while (col < avail) {
2620 		waddch(view->window, ' ');
2621 		col++;
2622 	}
2623 done:
2624 	free(logmsg0);
2625 	free(wlogmsg);
2626 	free(wrefstr);
2627 	free(refs_str);
2628 	free(author);
2629 	free(wauthor);
2630 	free(line);
2631 	return err;
2632 }
2633 
2634 static struct commit_queue_entry *
2635 alloc_commit_queue_entry(struct got_commit_object *commit,
2636     struct got_object_id *id)
2637 {
2638 	struct commit_queue_entry *entry;
2639 	struct got_object_id *dup;
2640 
2641 	entry = calloc(1, sizeof(*entry));
2642 	if (entry == NULL)
2643 		return NULL;
2644 
2645 	dup = got_object_id_dup(id);
2646 	if (dup == NULL) {
2647 		free(entry);
2648 		return NULL;
2649 	}
2650 
2651 	entry->id = dup;
2652 	entry->commit = commit;
2653 	return entry;
2654 }
2655 
2656 static void
2657 pop_commit(struct commit_queue *commits)
2658 {
2659 	struct commit_queue_entry *entry;
2660 
2661 	entry = TAILQ_FIRST(&commits->head);
2662 	TAILQ_REMOVE(&commits->head, entry, entry);
2663 	got_object_commit_close(entry->commit);
2664 	commits->ncommits--;
2665 	free(entry->id);
2666 	free(entry);
2667 }
2668 
2669 static void
2670 free_commits(struct commit_queue *commits)
2671 {
2672 	while (!TAILQ_EMPTY(&commits->head))
2673 		pop_commit(commits);
2674 }
2675 
2676 static const struct got_error *
2677 match_commit(int *have_match, struct got_object_id *id,
2678     struct got_commit_object *commit, regex_t *regex)
2679 {
2680 	const struct got_error *err = NULL;
2681 	regmatch_t regmatch;
2682 	char *id_str = NULL, *logmsg = NULL;
2683 
2684 	*have_match = 0;
2685 
2686 	err = got_object_id_str(&id_str, id);
2687 	if (err)
2688 		return err;
2689 
2690 	err = got_object_commit_get_logmsg(&logmsg, commit);
2691 	if (err)
2692 		goto done;
2693 
2694 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2695 	    &regmatch, 0) == 0 ||
2696 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2697 	    &regmatch, 0) == 0 ||
2698 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2699 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2700 		*have_match = 1;
2701 done:
2702 	free(id_str);
2703 	free(logmsg);
2704 	return err;
2705 }
2706 
2707 static const struct got_error *
2708 queue_commits(struct tog_log_thread_args *a)
2709 {
2710 	const struct got_error *err = NULL;
2711 
2712 	/*
2713 	 * We keep all commits open throughout the lifetime of the log
2714 	 * view in order to avoid having to re-fetch commits from disk
2715 	 * while updating the display.
2716 	 */
2717 	do {
2718 		struct got_object_id id;
2719 		struct got_commit_object *commit;
2720 		struct commit_queue_entry *entry;
2721 		int limit_match = 0;
2722 		int errcode;
2723 
2724 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2725 		    NULL, NULL);
2726 		if (err)
2727 			break;
2728 
2729 		err = got_object_open_as_commit(&commit, a->repo, &id);
2730 		if (err)
2731 			break;
2732 		entry = alloc_commit_queue_entry(commit, &id);
2733 		if (entry == NULL) {
2734 			err = got_error_from_errno("alloc_commit_queue_entry");
2735 			break;
2736 		}
2737 
2738 		errcode = pthread_mutex_lock(&tog_mutex);
2739 		if (errcode) {
2740 			err = got_error_set_errno(errcode,
2741 			    "pthread_mutex_lock");
2742 			break;
2743 		}
2744 
2745 		entry->idx = a->real_commits->ncommits;
2746 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2747 		a->real_commits->ncommits++;
2748 
2749 		if (*a->limiting) {
2750 			err = match_commit(&limit_match, &id, commit,
2751 			    a->limit_regex);
2752 			if (err)
2753 				break;
2754 
2755 			if (limit_match) {
2756 				struct commit_queue_entry *matched;
2757 
2758 				matched = alloc_commit_queue_entry(
2759 				    entry->commit, entry->id);
2760 				if (matched == NULL) {
2761 					err = got_error_from_errno(
2762 					    "alloc_commit_queue_entry");
2763 					break;
2764 				}
2765 				matched->commit = entry->commit;
2766 				got_object_commit_retain(entry->commit);
2767 
2768 				matched->idx = a->limit_commits->ncommits;
2769 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2770 				    matched, entry);
2771 				a->limit_commits->ncommits++;
2772 			}
2773 
2774 			/*
2775 			 * This is how we signal log_thread() that we
2776 			 * have found a match, and that it should be
2777 			 * counted as a new entry for the view.
2778 			 */
2779 			a->limit_match = limit_match;
2780 		}
2781 
2782 		if (*a->searching == TOG_SEARCH_FORWARD &&
2783 		    !*a->search_next_done) {
2784 			int have_match;
2785 			err = match_commit(&have_match, &id, commit, a->regex);
2786 			if (err)
2787 				break;
2788 
2789 			if (*a->limiting) {
2790 				if (limit_match && have_match)
2791 					*a->search_next_done =
2792 					    TOG_SEARCH_HAVE_MORE;
2793 			} else if (have_match)
2794 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2795 		}
2796 
2797 		errcode = pthread_mutex_unlock(&tog_mutex);
2798 		if (errcode && err == NULL)
2799 			err = got_error_set_errno(errcode,
2800 			    "pthread_mutex_unlock");
2801 		if (err)
2802 			break;
2803 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2804 
2805 	return err;
2806 }
2807 
2808 static void
2809 select_commit(struct tog_log_view_state *s)
2810 {
2811 	struct commit_queue_entry *entry;
2812 	int ncommits = 0;
2813 
2814 	entry = s->first_displayed_entry;
2815 	while (entry) {
2816 		if (ncommits == s->selected) {
2817 			s->selected_entry = entry;
2818 			break;
2819 		}
2820 		entry = TAILQ_NEXT(entry, entry);
2821 		ncommits++;
2822 	}
2823 }
2824 
2825 static const struct got_error *
2826 draw_commits(struct tog_view *view)
2827 {
2828 	const struct got_error *err = NULL;
2829 	struct tog_log_view_state *s = &view->state.log;
2830 	struct commit_queue_entry *entry = s->selected_entry;
2831 	int limit = view->nlines;
2832 	int width;
2833 	int ncommits, author_cols = 4, refstr_cols;
2834 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2835 	char *refs_str = NULL;
2836 	wchar_t *wline;
2837 	struct tog_color *tc;
2838 	static const size_t date_display_cols = 12;
2839 	struct got_reflist_head *refs;
2840 
2841 	if (view_is_hsplit_top(view))
2842 		--limit;  /* account for border */
2843 
2844 	if (s->selected_entry &&
2845 	    !(view->searching && view->search_next_done == 0)) {
2846 		err = got_object_id_str(&id_str, s->selected_entry->id);
2847 		if (err)
2848 			return err;
2849 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2850 		    s->selected_entry->id);
2851 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2852 		    s->repo);
2853 		if (err)
2854 			goto done;
2855 	}
2856 
2857 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2858 		halfdelay(10); /* disable fast refresh */
2859 
2860 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2861 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2862 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2863 		    (view->searching && !view->search_next_done) ?
2864 		    "searching..." : "loading...") == -1) {
2865 			err = got_error_from_errno("asprintf");
2866 			goto done;
2867 		}
2868 	} else {
2869 		const char *search_str = NULL;
2870 		const char *limit_str = NULL;
2871 
2872 		if (view->searching) {
2873 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2874 				search_str = "no more matches";
2875 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2876 				search_str = "no matches found";
2877 			else if (!view->search_next_done)
2878 				search_str = "searching...";
2879 		}
2880 
2881 		if (s->limit_view && s->commits->ncommits == 0)
2882 			limit_str = "no matches found";
2883 
2884 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2885 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2886 		    search_str ? search_str : (refs_str ? refs_str : ""),
2887 		    limit_str ? limit_str : "") == -1) {
2888 			err = got_error_from_errno("asprintf");
2889 			goto done;
2890 		}
2891 	}
2892 
2893 	free(refs_str);
2894 	refs_str = NULL;
2895 
2896 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2897 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2898 		    "........................................",
2899 		    s->in_repo_path, ncommits_str) == -1) {
2900 			err = got_error_from_errno("asprintf");
2901 			header = NULL;
2902 			goto done;
2903 		}
2904 	} else if (asprintf(&header, "commit %s%s",
2905 	    id_str ? id_str : "........................................",
2906 	    ncommits_str) == -1) {
2907 		err = got_error_from_errno("asprintf");
2908 		header = NULL;
2909 		goto done;
2910 	}
2911 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2912 	if (err)
2913 		goto done;
2914 
2915 	werase(view->window);
2916 
2917 	if (view_needs_focus_indication(view))
2918 		wstandout(view->window);
2919 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2920 	if (tc)
2921 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2922 	waddwstr(view->window, wline);
2923 	while (width < view->ncols) {
2924 		waddch(view->window, ' ');
2925 		width++;
2926 	}
2927 	if (tc)
2928 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2929 	if (view_needs_focus_indication(view))
2930 		wstandend(view->window);
2931 	free(wline);
2932 	if (limit <= 1)
2933 		goto done;
2934 
2935 	/* Grow author column size if necessary, and set view->maxx. */
2936 	entry = s->first_displayed_entry;
2937 	ncommits = 0;
2938 	view->maxx = 0;
2939 	while (entry) {
2940 		struct got_commit_object *c = entry->commit;
2941 		char *author, *eol, *msg, *msg0;
2942 		wchar_t *wauthor, *wmsg;
2943 		int width;
2944 		if (ncommits >= limit - 1)
2945 			break;
2946 		if (s->use_committer)
2947 			author = strdup(got_object_commit_get_committer(c));
2948 		else
2949 			author = strdup(got_object_commit_get_author(c));
2950 		if (author == NULL) {
2951 			err = got_error_from_errno("strdup");
2952 			goto done;
2953 		}
2954 		err = format_author(&wauthor, &width, author, COLS,
2955 		    date_display_cols);
2956 		if (author_cols < width)
2957 			author_cols = width;
2958 		free(wauthor);
2959 		free(author);
2960 		if (err)
2961 			goto done;
2962 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2963 		    entry->id);
2964 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2965 		if (err)
2966 			goto done;
2967 		if (refs_str) {
2968 			wchar_t *ws;
2969 			err = format_line(&ws, &width, NULL, refs_str,
2970 			    0, INT_MAX, date_display_cols + author_cols, 0);
2971 			free(ws);
2972 			free(refs_str);
2973 			refs_str = NULL;
2974 			if (err)
2975 				goto done;
2976 			refstr_cols = width + 3; /* account for [ ] + space */
2977 		} else
2978 			refstr_cols = 0;
2979 		err = got_object_commit_get_logmsg(&msg0, c);
2980 		if (err)
2981 			goto done;
2982 		msg = msg0;
2983 		while (*msg == '\n')
2984 			++msg;
2985 		if ((eol = strchr(msg, '\n')))
2986 			*eol = '\0';
2987 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2988 		    date_display_cols + author_cols + refstr_cols, 0);
2989 		if (err)
2990 			goto done;
2991 		view->maxx = MAX(view->maxx, width + refstr_cols);
2992 		free(msg0);
2993 		free(wmsg);
2994 		ncommits++;
2995 		entry = TAILQ_NEXT(entry, entry);
2996 	}
2997 
2998 	entry = s->first_displayed_entry;
2999 	s->last_displayed_entry = s->first_displayed_entry;
3000 	ncommits = 0;
3001 	while (entry) {
3002 		if (ncommits >= limit - 1)
3003 			break;
3004 		if (ncommits == s->selected)
3005 			wstandout(view->window);
3006 		err = draw_commit(view, entry, date_display_cols, author_cols);
3007 		if (ncommits == s->selected)
3008 			wstandend(view->window);
3009 		if (err)
3010 			goto done;
3011 		ncommits++;
3012 		s->last_displayed_entry = entry;
3013 		entry = TAILQ_NEXT(entry, entry);
3014 	}
3015 
3016 	view_border(view);
3017 done:
3018 	free(id_str);
3019 	free(refs_str);
3020 	free(ncommits_str);
3021 	free(header);
3022 	return err;
3023 }
3024 
3025 static void
3026 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3027 {
3028 	struct commit_queue_entry *entry;
3029 	int nscrolled = 0;
3030 
3031 	entry = TAILQ_FIRST(&s->commits->head);
3032 	if (s->first_displayed_entry == entry)
3033 		return;
3034 
3035 	entry = s->first_displayed_entry;
3036 	while (entry && nscrolled < maxscroll) {
3037 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3038 		if (entry) {
3039 			s->first_displayed_entry = entry;
3040 			nscrolled++;
3041 		}
3042 	}
3043 }
3044 
3045 static const struct got_error *
3046 trigger_log_thread(struct tog_view *view, int wait)
3047 {
3048 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3049 	int errcode;
3050 
3051 	if (!using_mock_io)
3052 		halfdelay(1); /* fast refresh while loading commits */
3053 
3054 	while (!ta->log_complete && !tog_thread_error &&
3055 	    (ta->commits_needed > 0 || ta->load_all)) {
3056 		/* Wake the log thread. */
3057 		errcode = pthread_cond_signal(&ta->need_commits);
3058 		if (errcode)
3059 			return got_error_set_errno(errcode,
3060 			    "pthread_cond_signal");
3061 
3062 		/*
3063 		 * The mutex will be released while the view loop waits
3064 		 * in wgetch(), at which time the log thread will run.
3065 		 */
3066 		if (!wait)
3067 			break;
3068 
3069 		/* Display progress update in log view. */
3070 		show_log_view(view);
3071 		update_panels();
3072 		doupdate();
3073 
3074 		/* Wait right here while next commit is being loaded. */
3075 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3076 		if (errcode)
3077 			return got_error_set_errno(errcode,
3078 			    "pthread_cond_wait");
3079 
3080 		/* Display progress update in log view. */
3081 		show_log_view(view);
3082 		update_panels();
3083 		doupdate();
3084 	}
3085 
3086 	return NULL;
3087 }
3088 
3089 static const struct got_error *
3090 request_log_commits(struct tog_view *view)
3091 {
3092 	struct tog_log_view_state	*state = &view->state.log;
3093 	const struct got_error		*err = NULL;
3094 
3095 	if (state->thread_args.log_complete)
3096 		return NULL;
3097 
3098 	state->thread_args.commits_needed += view->nscrolled;
3099 	err = trigger_log_thread(view, 1);
3100 	view->nscrolled = 0;
3101 
3102 	return err;
3103 }
3104 
3105 static const struct got_error *
3106 log_scroll_down(struct tog_view *view, int maxscroll)
3107 {
3108 	struct tog_log_view_state *s = &view->state.log;
3109 	const struct got_error *err = NULL;
3110 	struct commit_queue_entry *pentry;
3111 	int nscrolled = 0, ncommits_needed;
3112 
3113 	if (s->last_displayed_entry == NULL)
3114 		return NULL;
3115 
3116 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3117 	if (s->commits->ncommits < ncommits_needed &&
3118 	    !s->thread_args.log_complete) {
3119 		/*
3120 		 * Ask the log thread for required amount of commits.
3121 		 */
3122 		s->thread_args.commits_needed +=
3123 		    ncommits_needed - s->commits->ncommits;
3124 		err = trigger_log_thread(view, 1);
3125 		if (err)
3126 			return err;
3127 	}
3128 
3129 	do {
3130 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3131 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3132 			break;
3133 
3134 		s->last_displayed_entry = pentry ?
3135 		    pentry : s->last_displayed_entry;
3136 
3137 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3138 		if (pentry == NULL)
3139 			break;
3140 		s->first_displayed_entry = pentry;
3141 	} while (++nscrolled < maxscroll);
3142 
3143 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3144 		view->nscrolled += nscrolled;
3145 	else
3146 		view->nscrolled = 0;
3147 
3148 	return err;
3149 }
3150 
3151 static const struct got_error *
3152 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3153     struct got_commit_object *commit, struct got_object_id *commit_id,
3154     struct tog_view *log_view, struct got_repository *repo)
3155 {
3156 	const struct got_error *err;
3157 	struct got_object_qid *parent_id;
3158 	struct tog_view *diff_view;
3159 
3160 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3161 	if (diff_view == NULL)
3162 		return got_error_from_errno("view_open");
3163 
3164 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3165 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3166 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3167 	if (err == NULL)
3168 		*new_view = diff_view;
3169 	return err;
3170 }
3171 
3172 static const struct got_error *
3173 tree_view_visit_subtree(struct tog_tree_view_state *s,
3174     struct got_tree_object *subtree)
3175 {
3176 	struct tog_parent_tree *parent;
3177 
3178 	parent = calloc(1, sizeof(*parent));
3179 	if (parent == NULL)
3180 		return got_error_from_errno("calloc");
3181 
3182 	parent->tree = s->tree;
3183 	parent->first_displayed_entry = s->first_displayed_entry;
3184 	parent->selected_entry = s->selected_entry;
3185 	parent->selected = s->selected;
3186 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3187 	s->tree = subtree;
3188 	s->selected = 0;
3189 	s->first_displayed_entry = NULL;
3190 	return NULL;
3191 }
3192 
3193 static const struct got_error *
3194 tree_view_walk_path(struct tog_tree_view_state *s,
3195     struct got_commit_object *commit, const char *path)
3196 {
3197 	const struct got_error *err = NULL;
3198 	struct got_tree_object *tree = NULL;
3199 	const char *p;
3200 	char *slash, *subpath = NULL;
3201 
3202 	/* Walk the path and open corresponding tree objects. */
3203 	p = path;
3204 	while (*p) {
3205 		struct got_tree_entry *te;
3206 		struct got_object_id *tree_id;
3207 		char *te_name;
3208 
3209 		while (p[0] == '/')
3210 			p++;
3211 
3212 		/* Ensure the correct subtree entry is selected. */
3213 		slash = strchr(p, '/');
3214 		if (slash == NULL)
3215 			te_name = strdup(p);
3216 		else
3217 			te_name = strndup(p, slash - p);
3218 		if (te_name == NULL) {
3219 			err = got_error_from_errno("strndup");
3220 			break;
3221 		}
3222 		te = got_object_tree_find_entry(s->tree, te_name);
3223 		if (te == NULL) {
3224 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3225 			free(te_name);
3226 			break;
3227 		}
3228 		free(te_name);
3229 		s->first_displayed_entry = s->selected_entry = te;
3230 
3231 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3232 			break; /* jump to this file's entry */
3233 
3234 		slash = strchr(p, '/');
3235 		if (slash)
3236 			subpath = strndup(path, slash - path);
3237 		else
3238 			subpath = strdup(path);
3239 		if (subpath == NULL) {
3240 			err = got_error_from_errno("strdup");
3241 			break;
3242 		}
3243 
3244 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3245 		    subpath);
3246 		if (err)
3247 			break;
3248 
3249 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3250 		free(tree_id);
3251 		if (err)
3252 			break;
3253 
3254 		err = tree_view_visit_subtree(s, tree);
3255 		if (err) {
3256 			got_object_tree_close(tree);
3257 			break;
3258 		}
3259 		if (slash == NULL)
3260 			break;
3261 		free(subpath);
3262 		subpath = NULL;
3263 		p = slash;
3264 	}
3265 
3266 	free(subpath);
3267 	return err;
3268 }
3269 
3270 static const struct got_error *
3271 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3272     struct commit_queue_entry *entry, const char *path,
3273     const char *head_ref_name, struct got_repository *repo)
3274 {
3275 	const struct got_error *err = NULL;
3276 	struct tog_tree_view_state *s;
3277 	struct tog_view *tree_view;
3278 
3279 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3280 	if (tree_view == NULL)
3281 		return got_error_from_errno("view_open");
3282 
3283 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3284 	if (err)
3285 		return err;
3286 	s = &tree_view->state.tree;
3287 
3288 	*new_view = tree_view;
3289 
3290 	if (got_path_is_root_dir(path))
3291 		return NULL;
3292 
3293 	return tree_view_walk_path(s, entry->commit, path);
3294 }
3295 
3296 static const struct got_error *
3297 block_signals_used_by_main_thread(void)
3298 {
3299 	sigset_t sigset;
3300 	int errcode;
3301 
3302 	if (sigemptyset(&sigset) == -1)
3303 		return got_error_from_errno("sigemptyset");
3304 
3305 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3306 	if (sigaddset(&sigset, SIGWINCH) == -1)
3307 		return got_error_from_errno("sigaddset");
3308 	if (sigaddset(&sigset, SIGCONT) == -1)
3309 		return got_error_from_errno("sigaddset");
3310 	if (sigaddset(&sigset, SIGINT) == -1)
3311 		return got_error_from_errno("sigaddset");
3312 	if (sigaddset(&sigset, SIGTERM) == -1)
3313 		return got_error_from_errno("sigaddset");
3314 
3315 	/* ncurses handles SIGTSTP */
3316 	if (sigaddset(&sigset, SIGTSTP) == -1)
3317 		return got_error_from_errno("sigaddset");
3318 
3319 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3320 	if (errcode)
3321 		return got_error_set_errno(errcode, "pthread_sigmask");
3322 
3323 	return NULL;
3324 }
3325 
3326 static void *
3327 log_thread(void *arg)
3328 {
3329 	const struct got_error *err = NULL;
3330 	int errcode = 0;
3331 	struct tog_log_thread_args *a = arg;
3332 	int done = 0;
3333 
3334 	/*
3335 	 * Sync startup with main thread such that we begin our
3336 	 * work once view_input() has released the mutex.
3337 	 */
3338 	errcode = pthread_mutex_lock(&tog_mutex);
3339 	if (errcode) {
3340 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3341 		return (void *)err;
3342 	}
3343 
3344 	err = block_signals_used_by_main_thread();
3345 	if (err) {
3346 		pthread_mutex_unlock(&tog_mutex);
3347 		goto done;
3348 	}
3349 
3350 	while (!done && !err && !tog_fatal_signal_received()) {
3351 		errcode = pthread_mutex_unlock(&tog_mutex);
3352 		if (errcode) {
3353 			err = got_error_set_errno(errcode,
3354 			    "pthread_mutex_unlock");
3355 			goto done;
3356 		}
3357 		err = queue_commits(a);
3358 		if (err) {
3359 			if (err->code != GOT_ERR_ITER_COMPLETED)
3360 				goto done;
3361 			err = NULL;
3362 			done = 1;
3363 			a->commits_needed = 0;
3364 		} else if (a->commits_needed > 0 && !a->load_all) {
3365 			if (*a->limiting) {
3366 				if (a->limit_match)
3367 					a->commits_needed--;
3368 			} else
3369 				a->commits_needed--;
3370 		}
3371 
3372 		errcode = pthread_mutex_lock(&tog_mutex);
3373 		if (errcode) {
3374 			err = got_error_set_errno(errcode,
3375 			    "pthread_mutex_lock");
3376 			goto done;
3377 		} else if (*a->quit)
3378 			done = 1;
3379 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3380 			*a->first_displayed_entry =
3381 			    TAILQ_FIRST(&a->limit_commits->head);
3382 			*a->selected_entry = *a->first_displayed_entry;
3383 		} else if (*a->first_displayed_entry == NULL) {
3384 			*a->first_displayed_entry =
3385 			    TAILQ_FIRST(&a->real_commits->head);
3386 			*a->selected_entry = *a->first_displayed_entry;
3387 		}
3388 
3389 		errcode = pthread_cond_signal(&a->commit_loaded);
3390 		if (errcode) {
3391 			err = got_error_set_errno(errcode,
3392 			    "pthread_cond_signal");
3393 			pthread_mutex_unlock(&tog_mutex);
3394 			goto done;
3395 		}
3396 
3397 		if (a->commits_needed == 0 &&
3398 		    a->need_commit_marker && a->worktree) {
3399 			errcode = pthread_mutex_unlock(&tog_mutex);
3400 			if (errcode) {
3401 				err = got_error_set_errno(errcode,
3402 				    "pthread_mutex_unlock");
3403 				goto done;
3404 			}
3405 			err = got_worktree_get_state(&tog_base_commit.marker,
3406 			    a->repo, a->worktree, NULL, NULL);
3407 			if (err)
3408 				goto done;
3409 			errcode = pthread_mutex_lock(&tog_mutex);
3410 			if (errcode) {
3411 				err = got_error_set_errno(errcode,
3412 				    "pthread_mutex_lock");
3413 				goto done;
3414 			}
3415 			a->need_commit_marker = 0;
3416 			/*
3417 			 * The main thread did not close this
3418 			 * work tree yet. Close it now.
3419 			 */
3420 			got_worktree_close(a->worktree);
3421 			a->worktree = NULL;
3422 
3423 			if (*a->quit)
3424 				done = 1;
3425 		}
3426 
3427 		if (done)
3428 			a->commits_needed = 0;
3429 		else {
3430 			if (a->commits_needed == 0 && !a->load_all) {
3431 				if (tog_io.wait_for_ui) {
3432 					errcode = pthread_cond_signal(
3433 					    &a->log_loaded);
3434 					if (errcode && err == NULL)
3435 						err = got_error_set_errno(
3436 						    errcode,
3437 						    "pthread_cond_signal");
3438 				}
3439 
3440 				errcode = pthread_cond_wait(&a->need_commits,
3441 				    &tog_mutex);
3442 				if (errcode) {
3443 					err = got_error_set_errno(errcode,
3444 					    "pthread_cond_wait");
3445 					pthread_mutex_unlock(&tog_mutex);
3446 					goto done;
3447 				}
3448 				if (*a->quit)
3449 					done = 1;
3450 			}
3451 		}
3452 	}
3453 	a->log_complete = 1;
3454 	if (tog_io.wait_for_ui) {
3455 		errcode = pthread_cond_signal(&a->log_loaded);
3456 		if (errcode && err == NULL)
3457 			err = got_error_set_errno(errcode,
3458 			    "pthread_cond_signal");
3459 	}
3460 
3461 	errcode = pthread_mutex_unlock(&tog_mutex);
3462 	if (errcode)
3463 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3464 done:
3465 	if (err) {
3466 		tog_thread_error = 1;
3467 		pthread_cond_signal(&a->commit_loaded);
3468 		if (a->worktree) {
3469 			got_worktree_close(a->worktree);
3470 			a->worktree = NULL;
3471 		}
3472 	}
3473 	return (void *)err;
3474 }
3475 
3476 static const struct got_error *
3477 stop_log_thread(struct tog_log_view_state *s)
3478 {
3479 	const struct got_error *err = NULL, *thread_err = NULL;
3480 	int errcode;
3481 
3482 	if (s->thread) {
3483 		s->quit = 1;
3484 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3485 		if (errcode)
3486 			return got_error_set_errno(errcode,
3487 			    "pthread_cond_signal");
3488 		errcode = pthread_mutex_unlock(&tog_mutex);
3489 		if (errcode)
3490 			return got_error_set_errno(errcode,
3491 			    "pthread_mutex_unlock");
3492 		errcode = pthread_join(s->thread, (void **)&thread_err);
3493 		if (errcode)
3494 			return got_error_set_errno(errcode, "pthread_join");
3495 		errcode = pthread_mutex_lock(&tog_mutex);
3496 		if (errcode)
3497 			return got_error_set_errno(errcode,
3498 			    "pthread_mutex_lock");
3499 		s->thread = 0; //NULL;
3500 	}
3501 
3502 	if (s->thread_args.repo) {
3503 		err = got_repo_close(s->thread_args.repo);
3504 		s->thread_args.repo = NULL;
3505 	}
3506 
3507 	if (s->thread_args.pack_fds) {
3508 		const struct got_error *pack_err =
3509 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3510 		if (err == NULL)
3511 			err = pack_err;
3512 		s->thread_args.pack_fds = NULL;
3513 	}
3514 
3515 	if (s->thread_args.graph) {
3516 		got_commit_graph_close(s->thread_args.graph);
3517 		s->thread_args.graph = NULL;
3518 	}
3519 
3520 	return err ? err : thread_err;
3521 }
3522 
3523 static const struct got_error *
3524 close_log_view(struct tog_view *view)
3525 {
3526 	const struct got_error *err = NULL;
3527 	struct tog_log_view_state *s = &view->state.log;
3528 	int errcode;
3529 
3530 	err = stop_log_thread(s);
3531 
3532 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3533 	if (errcode && err == NULL)
3534 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3535 
3536 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3537 	if (errcode && err == NULL)
3538 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3539 
3540 	free_commits(&s->limit_commits);
3541 	free_commits(&s->real_commits);
3542 	free(s->in_repo_path);
3543 	s->in_repo_path = NULL;
3544 	free(s->start_id);
3545 	s->start_id = NULL;
3546 	free(s->head_ref_name);
3547 	s->head_ref_name = NULL;
3548 	return err;
3549 }
3550 
3551 /*
3552  * We use two queues to implement the limit feature: first consists of
3553  * commits matching the current limit_regex; second is the real queue
3554  * of all known commits (real_commits). When the user starts limiting,
3555  * we swap queues such that all movement and displaying functionality
3556  * works with very slight change.
3557  */
3558 static const struct got_error *
3559 limit_log_view(struct tog_view *view)
3560 {
3561 	struct tog_log_view_state *s = &view->state.log;
3562 	struct commit_queue_entry *entry;
3563 	struct tog_view	*v = view;
3564 	const struct got_error *err = NULL;
3565 	char pattern[1024];
3566 	int ret;
3567 
3568 	if (view_is_hsplit_top(view))
3569 		v = view->child;
3570 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3571 		v = view->parent;
3572 
3573 	if (tog_io.input_str != NULL) {
3574 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
3575 		    sizeof(pattern))
3576 			return got_error(GOT_ERR_NO_SPACE);
3577 	} else {
3578 		wmove(v->window, v->nlines - 1, 0);
3579 		wclrtoeol(v->window);
3580 		mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3581 		nodelay(v->window, FALSE);
3582 		nocbreak();
3583 		echo();
3584 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
3585 		cbreak();
3586 		noecho();
3587 		nodelay(v->window, TRUE);
3588 		if (ret == ERR)
3589 			return NULL;
3590 	}
3591 
3592 	if (*pattern == '\0') {
3593 		/*
3594 		 * Safety measure for the situation where the user
3595 		 * resets limit without previously limiting anything.
3596 		 */
3597 		if (!s->limit_view)
3598 			return NULL;
3599 
3600 		/*
3601 		 * User could have pressed Ctrl+L, which refreshed the
3602 		 * commit queues, it means we can't save previously
3603 		 * (before limit took place) displayed entries,
3604 		 * because they would point to already free'ed memory,
3605 		 * so we are forced to always select first entry of
3606 		 * the queue.
3607 		 */
3608 		s->commits = &s->real_commits;
3609 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3610 		s->selected_entry = s->first_displayed_entry;
3611 		s->selected = 0;
3612 		s->limit_view = 0;
3613 
3614 		return NULL;
3615 	}
3616 
3617 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3618 		return NULL;
3619 
3620 	s->limit_view = 1;
3621 
3622 	/* Clear the screen while loading limit view */
3623 	s->first_displayed_entry = NULL;
3624 	s->last_displayed_entry = NULL;
3625 	s->selected_entry = NULL;
3626 	s->commits = &s->limit_commits;
3627 
3628 	/* Prepare limit queue for new search */
3629 	free_commits(&s->limit_commits);
3630 	s->limit_commits.ncommits = 0;
3631 
3632 	/* First process commits, which are in queue already */
3633 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3634 		int have_match = 0;
3635 
3636 		err = match_commit(&have_match, entry->id,
3637 		    entry->commit, &s->limit_regex);
3638 		if (err)
3639 			return err;
3640 
3641 		if (have_match) {
3642 			struct commit_queue_entry *matched;
3643 
3644 			matched = alloc_commit_queue_entry(entry->commit,
3645 			    entry->id);
3646 			if (matched == NULL) {
3647 				err = got_error_from_errno(
3648 				    "alloc_commit_queue_entry");
3649 				break;
3650 			}
3651 			matched->commit = entry->commit;
3652 			got_object_commit_retain(entry->commit);
3653 
3654 			matched->idx = s->limit_commits.ncommits;
3655 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3656 			    matched, entry);
3657 			s->limit_commits.ncommits++;
3658 		}
3659 	}
3660 
3661 	/* Second process all the commits, until we fill the screen */
3662 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3663 	    !s->thread_args.log_complete) {
3664 		s->thread_args.commits_needed +=
3665 		    view->nlines - s->limit_commits.ncommits - 1;
3666 		err = trigger_log_thread(view, 1);
3667 		if (err)
3668 			return err;
3669 	}
3670 
3671 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3672 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3673 	s->selected = 0;
3674 
3675 	return NULL;
3676 }
3677 
3678 static const struct got_error *
3679 search_start_log_view(struct tog_view *view)
3680 {
3681 	struct tog_log_view_state *s = &view->state.log;
3682 
3683 	s->matched_entry = NULL;
3684 	s->search_entry = NULL;
3685 	return NULL;
3686 }
3687 
3688 static const struct got_error *
3689 search_next_log_view(struct tog_view *view)
3690 {
3691 	const struct got_error *err = NULL;
3692 	struct tog_log_view_state *s = &view->state.log;
3693 	struct commit_queue_entry *entry;
3694 
3695 	/* Display progress update in log view. */
3696 	show_log_view(view);
3697 	update_panels();
3698 	doupdate();
3699 
3700 	if (s->search_entry) {
3701 		if (!using_mock_io) {
3702 			int errcode, ch;
3703 
3704 			errcode = pthread_mutex_unlock(&tog_mutex);
3705 			if (errcode)
3706 				return got_error_set_errno(errcode,
3707 				    "pthread_mutex_unlock");
3708 			ch = wgetch(view->window);
3709 			errcode = pthread_mutex_lock(&tog_mutex);
3710 			if (errcode)
3711 				return got_error_set_errno(errcode,
3712 				    "pthread_mutex_lock");
3713 			if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3714 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3715 				return NULL;
3716 			}
3717 		}
3718 		if (view->searching == TOG_SEARCH_FORWARD)
3719 			entry = TAILQ_NEXT(s->search_entry, entry);
3720 		else
3721 			entry = TAILQ_PREV(s->search_entry,
3722 			    commit_queue_head, entry);
3723 	} else if (s->matched_entry) {
3724 		/*
3725 		 * If the user has moved the cursor after we hit a match,
3726 		 * the position from where we should continue searching
3727 		 * might have changed.
3728 		 */
3729 		if (view->searching == TOG_SEARCH_FORWARD)
3730 			entry = TAILQ_NEXT(s->selected_entry, entry);
3731 		else
3732 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3733 			    entry);
3734 	} else {
3735 		entry = s->selected_entry;
3736 	}
3737 
3738 	while (1) {
3739 		int have_match = 0;
3740 
3741 		if (entry == NULL) {
3742 			if (s->thread_args.log_complete ||
3743 			    view->searching == TOG_SEARCH_BACKWARD) {
3744 				view->search_next_done =
3745 				    (s->matched_entry == NULL ?
3746 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3747 				s->search_entry = NULL;
3748 				return NULL;
3749 			}
3750 			/*
3751 			 * Poke the log thread for more commits and return,
3752 			 * allowing the main loop to make progress. Search
3753 			 * will resume at s->search_entry once we come back.
3754 			 */
3755 			s->search_entry = s->selected_entry;
3756 			s->thread_args.commits_needed++;
3757 			return trigger_log_thread(view, 0);
3758 		}
3759 
3760 		err = match_commit(&have_match, entry->id, entry->commit,
3761 		    &view->regex);
3762 		if (err)
3763 			break;
3764 		if (have_match) {
3765 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3766 			s->matched_entry = entry;
3767 			break;
3768 		}
3769 
3770 		s->search_entry = entry;
3771 		if (view->searching == TOG_SEARCH_FORWARD)
3772 			entry = TAILQ_NEXT(entry, entry);
3773 		else
3774 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3775 	}
3776 
3777 	if (s->matched_entry) {
3778 		int cur = s->selected_entry->idx;
3779 		while (cur < s->matched_entry->idx) {
3780 			err = input_log_view(NULL, view, KEY_DOWN);
3781 			if (err)
3782 				return err;
3783 			cur++;
3784 		}
3785 		while (cur > s->matched_entry->idx) {
3786 			err = input_log_view(NULL, view, KEY_UP);
3787 			if (err)
3788 				return err;
3789 			cur--;
3790 		}
3791 	}
3792 
3793 	s->search_entry = NULL;
3794 
3795 	return NULL;
3796 }
3797 
3798 static const struct got_error *
3799 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3800     struct got_repository *repo, const char *head_ref_name,
3801     const char *in_repo_path, int log_branches,
3802     struct got_worktree *worktree)
3803 {
3804 	const struct got_error *err = NULL;
3805 	struct tog_log_view_state *s = &view->state.log;
3806 	struct got_repository *thread_repo = NULL;
3807 	struct got_commit_graph *thread_graph = NULL;
3808 	int errcode;
3809 
3810 	if (in_repo_path != s->in_repo_path) {
3811 		free(s->in_repo_path);
3812 		s->in_repo_path = strdup(in_repo_path);
3813 		if (s->in_repo_path == NULL) {
3814 			err = got_error_from_errno("strdup");
3815 			goto done;
3816 		}
3817 	}
3818 
3819 	/* The commit queue only contains commits being displayed. */
3820 	TAILQ_INIT(&s->real_commits.head);
3821 	s->real_commits.ncommits = 0;
3822 	s->commits = &s->real_commits;
3823 
3824 	TAILQ_INIT(&s->limit_commits.head);
3825 	s->limit_view = 0;
3826 	s->limit_commits.ncommits = 0;
3827 
3828 	s->repo = repo;
3829 	if (head_ref_name) {
3830 		s->head_ref_name = strdup(head_ref_name);
3831 		if (s->head_ref_name == NULL) {
3832 			err = got_error_from_errno("strdup");
3833 			goto done;
3834 		}
3835 	}
3836 	s->start_id = got_object_id_dup(start_id);
3837 	if (s->start_id == NULL) {
3838 		err = got_error_from_errno("got_object_id_dup");
3839 		goto done;
3840 	}
3841 	s->log_branches = log_branches;
3842 	s->use_committer = 1;
3843 
3844 	STAILQ_INIT(&s->colors);
3845 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3846 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3847 		    get_color_value("TOG_COLOR_COMMIT"));
3848 		if (err)
3849 			goto done;
3850 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3851 		    get_color_value("TOG_COLOR_AUTHOR"));
3852 		if (err) {
3853 			free_colors(&s->colors);
3854 			goto done;
3855 		}
3856 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3857 		    get_color_value("TOG_COLOR_DATE"));
3858 		if (err) {
3859 			free_colors(&s->colors);
3860 			goto done;
3861 		}
3862 	}
3863 
3864 	view->show = show_log_view;
3865 	view->input = input_log_view;
3866 	view->resize = resize_log_view;
3867 	view->close = close_log_view;
3868 	view->search_start = search_start_log_view;
3869 	view->search_next = search_next_log_view;
3870 
3871 	if (s->thread_args.pack_fds == NULL) {
3872 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3873 		if (err)
3874 			goto done;
3875 	}
3876 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3877 	    s->thread_args.pack_fds);
3878 	if (err)
3879 		goto done;
3880 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3881 	    !s->log_branches);
3882 	if (err)
3883 		goto done;
3884 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3885 	    s->repo, NULL, NULL);
3886 	if (err)
3887 		goto done;
3888 
3889 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3890 	if (errcode) {
3891 		err = got_error_set_errno(errcode, "pthread_cond_init");
3892 		goto done;
3893 	}
3894 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3895 	if (errcode) {
3896 		err = got_error_set_errno(errcode, "pthread_cond_init");
3897 		goto done;
3898 	}
3899 
3900 	if (using_mock_io) {
3901 		int rc;
3902 
3903 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3904 		if (rc)
3905 			return got_error_set_errno(rc, "pthread_cond_init");
3906 	}
3907 
3908 	s->thread_args.commits_needed = view->nlines;
3909 	s->thread_args.graph = thread_graph;
3910 	s->thread_args.real_commits = &s->real_commits;
3911 	s->thread_args.limit_commits = &s->limit_commits;
3912 	s->thread_args.in_repo_path = s->in_repo_path;
3913 	s->thread_args.start_id = s->start_id;
3914 	s->thread_args.repo = thread_repo;
3915 	s->thread_args.log_complete = 0;
3916 	s->thread_args.quit = &s->quit;
3917 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3918 	s->thread_args.selected_entry = &s->selected_entry;
3919 	s->thread_args.searching = &view->searching;
3920 	s->thread_args.search_next_done = &view->search_next_done;
3921 	s->thread_args.regex = &view->regex;
3922 	s->thread_args.limiting = &s->limit_view;
3923 	s->thread_args.limit_regex = &s->limit_regex;
3924 	s->thread_args.limit_commits = &s->limit_commits;
3925 	s->thread_args.worktree = worktree;
3926 	if (worktree)
3927 		s->thread_args.need_commit_marker = 1;
3928 done:
3929 	if (err) {
3930 		if (view->close == NULL)
3931 			close_log_view(view);
3932 		view_close(view);
3933 	}
3934 	return err;
3935 }
3936 
3937 static const struct got_error *
3938 show_log_view(struct tog_view *view)
3939 {
3940 	const struct got_error *err;
3941 	struct tog_log_view_state *s = &view->state.log;
3942 
3943 	if (s->thread == 0) { //NULL) {
3944 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3945 		    &s->thread_args);
3946 		if (errcode)
3947 			return got_error_set_errno(errcode, "pthread_create");
3948 		if (s->thread_args.commits_needed > 0) {
3949 			err = trigger_log_thread(view, 1);
3950 			if (err)
3951 				return err;
3952 		}
3953 	}
3954 
3955 	return draw_commits(view);
3956 }
3957 
3958 static void
3959 log_move_cursor_up(struct tog_view *view, int page, int home)
3960 {
3961 	struct tog_log_view_state *s = &view->state.log;
3962 
3963 	if (s->first_displayed_entry == NULL)
3964 		return;
3965 	if (s->selected_entry->idx == 0)
3966 		view->count = 0;
3967 
3968 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3969 	    || home)
3970 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3971 
3972 	if (!page && !home && s->selected > 0)
3973 		--s->selected;
3974 	else
3975 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3976 
3977 	select_commit(s);
3978 	return;
3979 }
3980 
3981 static const struct got_error *
3982 log_move_cursor_down(struct tog_view *view, int page)
3983 {
3984 	struct tog_log_view_state	*s = &view->state.log;
3985 	const struct got_error		*err = NULL;
3986 	int				 eos = view->nlines - 2;
3987 
3988 	if (s->first_displayed_entry == NULL)
3989 		return NULL;
3990 
3991 	if (s->thread_args.log_complete &&
3992 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3993 		return NULL;
3994 
3995 	if (view_is_hsplit_top(view))
3996 		--eos;  /* border consumes the last line */
3997 
3998 	if (!page) {
3999 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
4000 			++s->selected;
4001 		else
4002 			err = log_scroll_down(view, 1);
4003 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
4004 		struct commit_queue_entry *entry;
4005 		int n;
4006 
4007 		s->selected = 0;
4008 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
4009 		s->last_displayed_entry = entry;
4010 		for (n = 0; n <= eos; n++) {
4011 			if (entry == NULL)
4012 				break;
4013 			s->first_displayed_entry = entry;
4014 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
4015 		}
4016 		if (n > 0)
4017 			s->selected = n - 1;
4018 	} else {
4019 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
4020 		    s->thread_args.log_complete)
4021 			s->selected += MIN(page,
4022 			    s->commits->ncommits - s->selected_entry->idx - 1);
4023 		else
4024 			err = log_scroll_down(view, page);
4025 	}
4026 	if (err)
4027 		return err;
4028 
4029 	/*
4030 	 * We might necessarily overshoot in horizontal
4031 	 * splits; if so, select the last displayed commit.
4032 	 */
4033 	if (s->first_displayed_entry && s->last_displayed_entry) {
4034 		s->selected = MIN(s->selected,
4035 		    s->last_displayed_entry->idx -
4036 		    s->first_displayed_entry->idx);
4037 	}
4038 
4039 	select_commit(s);
4040 
4041 	if (s->thread_args.log_complete &&
4042 	    s->selected_entry->idx == s->commits->ncommits - 1)
4043 		view->count = 0;
4044 
4045 	return NULL;
4046 }
4047 
4048 static void
4049 view_get_split(struct tog_view *view, int *y, int *x)
4050 {
4051 	*x = 0;
4052 	*y = 0;
4053 
4054 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4055 		if (view->child && view->child->resized_y)
4056 			*y = view->child->resized_y;
4057 		else if (view->resized_y)
4058 			*y = view->resized_y;
4059 		else
4060 			*y = view_split_begin_y(view->lines);
4061 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4062 		if (view->child && view->child->resized_x)
4063 			*x = view->child->resized_x;
4064 		else if (view->resized_x)
4065 			*x = view->resized_x;
4066 		else
4067 			*x = view_split_begin_x(view->begin_x);
4068 	}
4069 }
4070 
4071 /* Split view horizontally at y and offset view->state->selected line. */
4072 static const struct got_error *
4073 view_init_hsplit(struct tog_view *view, int y)
4074 {
4075 	const struct got_error *err = NULL;
4076 
4077 	view->nlines = y;
4078 	view->ncols = COLS;
4079 	err = view_resize(view);
4080 	if (err)
4081 		return err;
4082 
4083 	err = offset_selection_down(view);
4084 
4085 	return err;
4086 }
4087 
4088 static const struct got_error *
4089 log_goto_line(struct tog_view *view, int nlines)
4090 {
4091 	const struct got_error		*err = NULL;
4092 	struct tog_log_view_state	*s = &view->state.log;
4093 	int				 g, idx = s->selected_entry->idx;
4094 
4095 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4096 		return NULL;
4097 
4098 	g = view->gline;
4099 	view->gline = 0;
4100 
4101 	if (g >= s->first_displayed_entry->idx + 1 &&
4102 	    g <= s->last_displayed_entry->idx + 1 &&
4103 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4104 		s->selected = g - s->first_displayed_entry->idx - 1;
4105 		select_commit(s);
4106 		return NULL;
4107 	}
4108 
4109 	if (idx + 1 < g) {
4110 		err = log_move_cursor_down(view, g - idx - 1);
4111 		if (!err && g > s->selected_entry->idx + 1)
4112 			err = log_move_cursor_down(view,
4113 			    g - s->first_displayed_entry->idx - 1);
4114 		if (err)
4115 			return err;
4116 	} else if (idx + 1 > g)
4117 		log_move_cursor_up(view, idx - g + 1, 0);
4118 
4119 	if (g < nlines && s->first_displayed_entry->idx == 0)
4120 		s->selected = g - 1;
4121 
4122 	select_commit(s);
4123 	return NULL;
4124 
4125 }
4126 
4127 static void
4128 horizontal_scroll_input(struct tog_view *view, int ch)
4129 {
4130 
4131 	switch (ch) {
4132 	case KEY_LEFT:
4133 	case 'h':
4134 		view->x -= MIN(view->x, 2);
4135 		if (view->x <= 0)
4136 			view->count = 0;
4137 		break;
4138 	case KEY_RIGHT:
4139 	case 'l':
4140 		if (view->x + view->ncols / 2 < view->maxx)
4141 			view->x += 2;
4142 		else
4143 			view->count = 0;
4144 		break;
4145 	case '0':
4146 		view->x = 0;
4147 		break;
4148 	case '$':
4149 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4150 		view->count = 0;
4151 		break;
4152 	default:
4153 		break;
4154 	}
4155 }
4156 
4157 static const struct got_error *
4158 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4159 {
4160 	const struct got_error *err = NULL;
4161 	struct tog_log_view_state *s = &view->state.log;
4162 	int eos, nscroll;
4163 
4164 	if (s->thread_args.load_all) {
4165 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4166 			s->thread_args.load_all = 0;
4167 		else if (s->thread_args.log_complete) {
4168 			err = log_move_cursor_down(view, s->commits->ncommits);
4169 			s->thread_args.load_all = 0;
4170 		}
4171 		if (err)
4172 			return err;
4173 	}
4174 
4175 	eos = nscroll = view->nlines - 1;
4176 	if (view_is_hsplit_top(view))
4177 		--eos;  /* border */
4178 
4179 	if (view->gline)
4180 		return log_goto_line(view, eos);
4181 
4182 	switch (ch) {
4183 	case '&':
4184 		err = limit_log_view(view);
4185 		break;
4186 	case 'q':
4187 		s->quit = 1;
4188 		break;
4189 	case '0':
4190 	case '$':
4191 	case KEY_RIGHT:
4192 	case 'l':
4193 	case KEY_LEFT:
4194 	case 'h':
4195 		horizontal_scroll_input(view, ch);
4196 		break;
4197 	case 'k':
4198 	case KEY_UP:
4199 	case '<':
4200 	case ',':
4201 	case CTRL('p'):
4202 		log_move_cursor_up(view, 0, 0);
4203 		break;
4204 	case 'g':
4205 	case '=':
4206 	case KEY_HOME:
4207 		log_move_cursor_up(view, 0, 1);
4208 		view->count = 0;
4209 		break;
4210 	case CTRL('u'):
4211 	case 'u':
4212 		nscroll /= 2;
4213 		/* FALL THROUGH */
4214 	case KEY_PPAGE:
4215 	case CTRL('b'):
4216 	case 'b':
4217 		log_move_cursor_up(view, nscroll, 0);
4218 		break;
4219 	case 'j':
4220 	case KEY_DOWN:
4221 	case '>':
4222 	case '.':
4223 	case CTRL('n'):
4224 		err = log_move_cursor_down(view, 0);
4225 		break;
4226 	case '@':
4227 		s->use_committer = !s->use_committer;
4228 		view->action = s->use_committer ?
4229 		    "show committer" : "show commit author";
4230 		break;
4231 	case 'G':
4232 	case '*':
4233 	case KEY_END: {
4234 		/* We don't know yet how many commits, so we're forced to
4235 		 * traverse them all. */
4236 		view->count = 0;
4237 		s->thread_args.load_all = 1;
4238 		if (!s->thread_args.log_complete)
4239 			return trigger_log_thread(view, 0);
4240 		err = log_move_cursor_down(view, s->commits->ncommits);
4241 		s->thread_args.load_all = 0;
4242 		break;
4243 	}
4244 	case CTRL('d'):
4245 	case 'd':
4246 		nscroll /= 2;
4247 		/* FALL THROUGH */
4248 	case KEY_NPAGE:
4249 	case CTRL('f'):
4250 	case 'f':
4251 	case ' ':
4252 		err = log_move_cursor_down(view, nscroll);
4253 		break;
4254 	case KEY_RESIZE:
4255 		if (s->selected > view->nlines - 2)
4256 			s->selected = view->nlines - 2;
4257 		if (s->selected > s->commits->ncommits - 1)
4258 			s->selected = s->commits->ncommits - 1;
4259 		select_commit(s);
4260 		if (s->commits->ncommits < view->nlines - 1 &&
4261 		    !s->thread_args.log_complete) {
4262 			s->thread_args.commits_needed += (view->nlines - 1) -
4263 			    s->commits->ncommits;
4264 			err = trigger_log_thread(view, 1);
4265 		}
4266 		break;
4267 	case KEY_ENTER:
4268 	case '\r':
4269 		view->count = 0;
4270 		if (s->selected_entry == NULL)
4271 			break;
4272 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4273 		break;
4274 	case 'T':
4275 		view->count = 0;
4276 		if (s->selected_entry == NULL)
4277 			break;
4278 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4279 		break;
4280 	case KEY_BACKSPACE:
4281 	case CTRL('l'):
4282 	case 'B':
4283 		view->count = 0;
4284 		if (ch == KEY_BACKSPACE &&
4285 		    got_path_is_root_dir(s->in_repo_path))
4286 			break;
4287 		err = stop_log_thread(s);
4288 		if (err)
4289 			return err;
4290 		if (ch == KEY_BACKSPACE) {
4291 			char *parent_path;
4292 			err = got_path_dirname(&parent_path, s->in_repo_path);
4293 			if (err)
4294 				return err;
4295 			free(s->in_repo_path);
4296 			s->in_repo_path = parent_path;
4297 			s->thread_args.in_repo_path = s->in_repo_path;
4298 		} else if (ch == CTRL('l')) {
4299 			struct got_object_id *start_id;
4300 			err = got_repo_match_object_id(&start_id, NULL,
4301 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4302 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4303 			if (err) {
4304 				if (s->head_ref_name == NULL ||
4305 				    err->code != GOT_ERR_NOT_REF)
4306 					return err;
4307 				/* Try to cope with deleted references. */
4308 				free(s->head_ref_name);
4309 				s->head_ref_name = NULL;
4310 				err = got_repo_match_object_id(&start_id,
4311 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4312 				    &tog_refs, s->repo);
4313 				if (err)
4314 					return err;
4315 			}
4316 			free(s->start_id);
4317 			s->start_id = start_id;
4318 			s->thread_args.start_id = s->start_id;
4319 		} else /* 'B' */
4320 			s->log_branches = !s->log_branches;
4321 
4322 		if (s->thread_args.pack_fds == NULL) {
4323 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4324 			if (err)
4325 				return err;
4326 		}
4327 		err = got_repo_open(&s->thread_args.repo,
4328 		    got_repo_get_path(s->repo), NULL,
4329 		    s->thread_args.pack_fds);
4330 		if (err)
4331 			return err;
4332 		tog_free_refs();
4333 		err = tog_load_refs(s->repo, 0);
4334 		if (err)
4335 			return err;
4336 		err = got_commit_graph_open(&s->thread_args.graph,
4337 		    s->in_repo_path, !s->log_branches);
4338 		if (err)
4339 			return err;
4340 		err = got_commit_graph_iter_start(s->thread_args.graph,
4341 		    s->start_id, s->repo, NULL, NULL);
4342 		if (err)
4343 			return err;
4344 		free_commits(&s->real_commits);
4345 		free_commits(&s->limit_commits);
4346 		s->first_displayed_entry = NULL;
4347 		s->last_displayed_entry = NULL;
4348 		s->selected_entry = NULL;
4349 		s->selected = 0;
4350 		s->thread_args.log_complete = 0;
4351 		s->quit = 0;
4352 		s->thread_args.commits_needed = view->lines;
4353 		s->matched_entry = NULL;
4354 		s->search_entry = NULL;
4355 		view->offset = 0;
4356 		break;
4357 	case 'R':
4358 		view->count = 0;
4359 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4360 		break;
4361 	default:
4362 		view->count = 0;
4363 		break;
4364 	}
4365 
4366 	return err;
4367 }
4368 
4369 static const struct got_error *
4370 apply_unveil(const char *repo_path, const char *worktree_path)
4371 {
4372 	const struct got_error *error;
4373 
4374 #ifdef PROFILE
4375 	if (unveil("gmon.out", "rwc") != 0)
4376 		return got_error_from_errno2("unveil", "gmon.out");
4377 #endif
4378 	if (repo_path && unveil(repo_path, "r") != 0)
4379 		return got_error_from_errno2("unveil", repo_path);
4380 
4381 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4382 		return got_error_from_errno2("unveil", worktree_path);
4383 
4384 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4385 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4386 
4387 	error = got_privsep_unveil_exec_helpers();
4388 	if (error != NULL)
4389 		return error;
4390 
4391 	if (unveil(NULL, NULL) != 0)
4392 		return got_error_from_errno("unveil");
4393 
4394 	return NULL;
4395 }
4396 
4397 static const struct got_error *
4398 init_mock_term(const char *test_script_path)
4399 {
4400 	const struct got_error	*err = NULL;
4401 	const char *screen_dump_path;
4402 	int in;
4403 
4404 	if (test_script_path == NULL || *test_script_path == '\0')
4405 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4406 
4407 	tog_io.f = fopen(test_script_path, "re");
4408 	if (tog_io.f == NULL) {
4409 		err = got_error_from_errno_fmt("fopen: %s",
4410 		    test_script_path);
4411 		goto done;
4412 	}
4413 
4414 	/* test mode, we don't want any output */
4415 	tog_io.cout = fopen("/dev/null", "w+");
4416 	if (tog_io.cout == NULL) {
4417 		err = got_error_from_errno2("fopen", "/dev/null");
4418 		goto done;
4419 	}
4420 
4421 	in = dup(fileno(tog_io.cout));
4422 	if (in == -1) {
4423 		err = got_error_from_errno("dup");
4424 		goto done;
4425 	}
4426 	tog_io.cin = fdopen(in, "r");
4427 	if (tog_io.cin == NULL) {
4428 		err = got_error_from_errno("fdopen");
4429 		close(in);
4430 		goto done;
4431 	}
4432 
4433 	screen_dump_path = getenv("TOG_SCR_DUMP");
4434 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4435 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4436 	tog_io.sdump = fopen(screen_dump_path, "we");
4437 	if (tog_io.sdump == NULL) {
4438 		err = got_error_from_errno2("fopen", screen_dump_path);
4439 		goto done;
4440 	}
4441 
4442 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4443 		err = got_error_from_errno("fseeko");
4444 		goto done;
4445 	}
4446 
4447 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4448 		err = got_error_msg(GOT_ERR_IO,
4449 		    "newterm: failed to initialise curses");
4450 
4451 	using_mock_io = 1;
4452 
4453 done:
4454 	if (err)
4455 		tog_io_close();
4456 	return err;
4457 }
4458 
4459 static void
4460 init_curses(void)
4461 {
4462 	if (using_mock_io) /* In test mode we use a fake terminal */
4463 		return;
4464 
4465 	initscr();
4466 
4467 	cbreak();
4468 	halfdelay(1); /* Fast refresh while initial view is loading. */
4469 	noecho();
4470 	nonl();
4471 	intrflush(stdscr, FALSE);
4472 	keypad(stdscr, TRUE);
4473 	curs_set(0);
4474 	if (getenv("TOG_COLORS") != NULL) {
4475 		start_color();
4476 		use_default_colors();
4477 	}
4478 
4479 	return;
4480 }
4481 
4482 static const struct got_error *
4483 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4484 {
4485 	tog_base_commit.id = got_object_id_dup(
4486 	    got_worktree_get_base_commit_id(worktree));
4487 	if (tog_base_commit.id == NULL)
4488 		return got_error_from_errno( "got_object_id_dup");
4489 
4490 	return NULL;
4491 }
4492 
4493 static const struct got_error *
4494 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4495     struct got_repository *repo, struct got_worktree *worktree)
4496 {
4497 	const struct got_error *err = NULL;
4498 
4499 	if (argc == 0) {
4500 		*in_repo_path = strdup("/");
4501 		if (*in_repo_path == NULL)
4502 			return got_error_from_errno("strdup");
4503 		return NULL;
4504 	}
4505 
4506 	if (worktree) {
4507 		const char *prefix = got_worktree_get_path_prefix(worktree);
4508 		char *p;
4509 
4510 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4511 		if (err)
4512 			return err;
4513 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4514 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4515 		    p) == -1) {
4516 			err = got_error_from_errno("asprintf");
4517 			*in_repo_path = NULL;
4518 		}
4519 		free(p);
4520 	} else
4521 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4522 
4523 	return err;
4524 }
4525 
4526 static const struct got_error *
4527 cmd_log(int argc, char *argv[])
4528 {
4529 	const struct got_error *error;
4530 	struct got_repository *repo = NULL;
4531 	struct got_worktree *worktree = NULL;
4532 	struct got_object_id *start_id = NULL;
4533 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4534 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4535 	struct got_reference *ref = NULL;
4536 	const char *head_ref_name = NULL;
4537 	int ch, log_branches = 0;
4538 	struct tog_view *view;
4539 	int *pack_fds = NULL;
4540 
4541 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4542 		switch (ch) {
4543 		case 'b':
4544 			log_branches = 1;
4545 			break;
4546 		case 'c':
4547 			start_commit = optarg;
4548 			break;
4549 		case 'r':
4550 			repo_path = realpath(optarg, NULL);
4551 			if (repo_path == NULL)
4552 				return got_error_from_errno2("realpath",
4553 				    optarg);
4554 			break;
4555 		default:
4556 			usage_log();
4557 			/* NOTREACHED */
4558 		}
4559 	}
4560 
4561 	argc -= optind;
4562 	argv += optind;
4563 
4564 	if (argc > 1)
4565 		usage_log();
4566 
4567 	error = got_repo_pack_fds_open(&pack_fds);
4568 	if (error != NULL)
4569 		goto done;
4570 
4571 	if (repo_path == NULL) {
4572 		cwd = getcwd(NULL, 0);
4573 		if (cwd == NULL) {
4574 			error = got_error_from_errno("getcwd");
4575 			goto done;
4576 		}
4577 		error = got_worktree_open(&worktree, cwd, NULL);
4578 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4579 			goto done;
4580 		if (worktree)
4581 			repo_path =
4582 			    strdup(got_worktree_get_repo_path(worktree));
4583 		else
4584 			repo_path = strdup(cwd);
4585 		if (repo_path == NULL) {
4586 			error = got_error_from_errno("strdup");
4587 			goto done;
4588 		}
4589 	}
4590 
4591 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4592 	if (error != NULL)
4593 		goto done;
4594 
4595 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4596 	    repo, worktree);
4597 	if (error)
4598 		goto done;
4599 
4600 	init_curses();
4601 
4602 	error = apply_unveil(got_repo_get_path(repo),
4603 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4604 	if (error)
4605 		goto done;
4606 
4607 	/* already loaded by tog_log_with_path()? */
4608 	if (TAILQ_EMPTY(&tog_refs)) {
4609 		error = tog_load_refs(repo, 0);
4610 		if (error)
4611 			goto done;
4612 	}
4613 
4614 	if (start_commit == NULL) {
4615 		error = got_repo_match_object_id(&start_id, &label,
4616 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4617 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4618 		if (error)
4619 			goto done;
4620 		head_ref_name = label;
4621 	} else {
4622 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4623 		    repo, worktree);
4624 		if (error != NULL)
4625 			goto done;
4626 		if (keyword_idstr != NULL)
4627 			start_commit = keyword_idstr;
4628 
4629 		error = got_ref_open(&ref, repo, start_commit, 0);
4630 		if (error == NULL)
4631 			head_ref_name = got_ref_get_name(ref);
4632 		else if (error->code != GOT_ERR_NOT_REF)
4633 			goto done;
4634 		error = got_repo_match_object_id(&start_id, NULL,
4635 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4636 		if (error)
4637 			goto done;
4638 	}
4639 
4640 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4641 	if (view == NULL) {
4642 		error = got_error_from_errno("view_open");
4643 		goto done;
4644 	}
4645 
4646 	if (worktree) {
4647 		error = set_tog_base_commit(repo, worktree);
4648 		if (error != NULL)
4649 			goto done;
4650 	}
4651 
4652 	error = open_log_view(view, start_id, repo, head_ref_name,
4653 	    in_repo_path, log_branches, worktree);
4654 	if (error)
4655 		goto done;
4656 
4657 	if (worktree) {
4658 		/* The work tree will be closed by the log thread. */
4659 		worktree = NULL;
4660 	}
4661 
4662 	error = view_loop(view);
4663 
4664 done:
4665 	free(tog_base_commit.id);
4666 	free(keyword_idstr);
4667 	free(in_repo_path);
4668 	free(repo_path);
4669 	free(cwd);
4670 	free(start_id);
4671 	free(label);
4672 	if (ref)
4673 		got_ref_close(ref);
4674 	if (repo) {
4675 		const struct got_error *close_err = got_repo_close(repo);
4676 		if (error == NULL)
4677 			error = close_err;
4678 	}
4679 	if (worktree)
4680 		got_worktree_close(worktree);
4681 	if (pack_fds) {
4682 		const struct got_error *pack_err =
4683 		    got_repo_pack_fds_close(pack_fds);
4684 		if (error == NULL)
4685 			error = pack_err;
4686 	}
4687 	tog_free_refs();
4688 	return error;
4689 }
4690 
4691 __dead static void
4692 usage_diff(void)
4693 {
4694 	endwin();
4695 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4696 	    "object1 object2\n", getprogname());
4697 	exit(1);
4698 }
4699 
4700 static int
4701 match_line(const char *line, regex_t *regex, size_t nmatch,
4702     regmatch_t *regmatch)
4703 {
4704 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4705 }
4706 
4707 static struct tog_color *
4708 match_color(struct tog_colors *colors, const char *line)
4709 {
4710 	struct tog_color *tc = NULL;
4711 
4712 	STAILQ_FOREACH(tc, colors, entry) {
4713 		if (match_line(line, &tc->regex, 0, NULL))
4714 			return tc;
4715 	}
4716 
4717 	return NULL;
4718 }
4719 
4720 static const struct got_error *
4721 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4722     WINDOW *window, int skipcol, regmatch_t *regmatch)
4723 {
4724 	const struct got_error *err = NULL;
4725 	char *exstr = NULL;
4726 	wchar_t *wline = NULL;
4727 	int rme, rms, n, width, scrollx;
4728 	int width0 = 0, width1 = 0, width2 = 0;
4729 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4730 
4731 	*wtotal = 0;
4732 
4733 	rms = regmatch->rm_so;
4734 	rme = regmatch->rm_eo;
4735 
4736 	err = expand_tab(&exstr, line);
4737 	if (err)
4738 		return err;
4739 
4740 	/* Split the line into 3 segments, according to match offsets. */
4741 	seg0 = strndup(exstr, rms);
4742 	if (seg0 == NULL) {
4743 		err = got_error_from_errno("strndup");
4744 		goto done;
4745 	}
4746 	seg1 = strndup(exstr + rms, rme - rms);
4747 	if (seg1 == NULL) {
4748 		err = got_error_from_errno("strndup");
4749 		goto done;
4750 	}
4751 	seg2 = strdup(exstr + rme);
4752 	if (seg2 == NULL) {
4753 		err = got_error_from_errno("strndup");
4754 		goto done;
4755 	}
4756 
4757 	/* draw up to matched token if we haven't scrolled past it */
4758 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4759 	    col_tab_align, 1);
4760 	if (err)
4761 		goto done;
4762 	n = MAX(width0 - skipcol, 0);
4763 	if (n) {
4764 		free(wline);
4765 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4766 		    wlimit, col_tab_align, 1);
4767 		if (err)
4768 			goto done;
4769 		waddwstr(window, &wline[scrollx]);
4770 		wlimit -= width;
4771 		*wtotal += width;
4772 	}
4773 
4774 	if (wlimit > 0) {
4775 		int i = 0, w = 0;
4776 		size_t wlen;
4777 
4778 		free(wline);
4779 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4780 		    col_tab_align, 1);
4781 		if (err)
4782 			goto done;
4783 		wlen = wcslen(wline);
4784 		while (i < wlen) {
4785 			width = wcwidth(wline[i]);
4786 			if (width == -1) {
4787 				/* should not happen, tabs are expanded */
4788 				err = got_error(GOT_ERR_RANGE);
4789 				goto done;
4790 			}
4791 			if (width0 + w + width > skipcol)
4792 				break;
4793 			w += width;
4794 			i++;
4795 		}
4796 		/* draw (visible part of) matched token (if scrolled into it) */
4797 		if (width1 - w > 0) {
4798 			wattron(window, A_STANDOUT);
4799 			waddwstr(window, &wline[i]);
4800 			wattroff(window, A_STANDOUT);
4801 			wlimit -= (width1 - w);
4802 			*wtotal += (width1 - w);
4803 		}
4804 	}
4805 
4806 	if (wlimit > 0) {  /* draw rest of line */
4807 		free(wline);
4808 		if (skipcol > width0 + width1) {
4809 			err = format_line(&wline, &width2, &scrollx, seg2,
4810 			    skipcol - (width0 + width1), wlimit,
4811 			    col_tab_align, 1);
4812 			if (err)
4813 				goto done;
4814 			waddwstr(window, &wline[scrollx]);
4815 		} else {
4816 			err = format_line(&wline, &width2, NULL, seg2, 0,
4817 			    wlimit, col_tab_align, 1);
4818 			if (err)
4819 				goto done;
4820 			waddwstr(window, wline);
4821 		}
4822 		*wtotal += width2;
4823 	}
4824 done:
4825 	free(wline);
4826 	free(exstr);
4827 	free(seg0);
4828 	free(seg1);
4829 	free(seg2);
4830 	return err;
4831 }
4832 
4833 static int
4834 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4835 {
4836 	FILE	*f = NULL;
4837 	int	*eof, *first, *selected;
4838 
4839 	if (view->type == TOG_VIEW_DIFF) {
4840 		struct tog_diff_view_state *s = &view->state.diff;
4841 
4842 		first = &s->first_displayed_line;
4843 		selected = first;
4844 		eof = &s->eof;
4845 		f = s->f;
4846 	} else if (view->type == TOG_VIEW_HELP) {
4847 		struct tog_help_view_state *s = &view->state.help;
4848 
4849 		first = &s->first_displayed_line;
4850 		selected = first;
4851 		eof = &s->eof;
4852 		f = s->f;
4853 	} else if (view->type == TOG_VIEW_BLAME) {
4854 		struct tog_blame_view_state *s = &view->state.blame;
4855 
4856 		first = &s->first_displayed_line;
4857 		selected = &s->selected_line;
4858 		eof = &s->eof;
4859 		f = s->blame.f;
4860 	} else
4861 		return 0;
4862 
4863 	/* Center gline in the middle of the page like vi(1). */
4864 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4865 		return 0;
4866 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4867 		rewind(f);
4868 		*eof = 0;
4869 		*first = 1;
4870 		*lineno = 0;
4871 		*nprinted = 0;
4872 		return 0;
4873 	}
4874 
4875 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4876 		view->gline : (view->nlines - 3) / 2 + 1;
4877 	view->gline = 0;
4878 
4879 	return 1;
4880 }
4881 
4882 static const struct got_error *
4883 draw_file(struct tog_view *view, const char *header)
4884 {
4885 	struct tog_diff_view_state *s = &view->state.diff;
4886 	regmatch_t *regmatch = &view->regmatch;
4887 	const struct got_error *err;
4888 	int nprinted = 0;
4889 	char *line;
4890 	size_t linesize = 0;
4891 	ssize_t linelen;
4892 	wchar_t *wline;
4893 	int width;
4894 	int max_lines = view->nlines;
4895 	int nlines = s->nlines;
4896 	off_t line_offset;
4897 
4898 	s->lineno = s->first_displayed_line - 1;
4899 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4900 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4901 		return got_error_from_errno("fseek");
4902 
4903 	werase(view->window);
4904 
4905 	if (view->gline > s->nlines - 1)
4906 		view->gline = s->nlines - 1;
4907 
4908 	if (header) {
4909 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4910 		    1 : view->gline - (view->nlines - 3) / 2 :
4911 		    s->lineno + s->selected_line;
4912 
4913 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4914 			return got_error_from_errno("asprintf");
4915 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4916 		    0, 0);
4917 		free(line);
4918 		if (err)
4919 			return err;
4920 
4921 		if (view_needs_focus_indication(view))
4922 			wstandout(view->window);
4923 		waddwstr(view->window, wline);
4924 		free(wline);
4925 		wline = NULL;
4926 		while (width++ < view->ncols)
4927 			waddch(view->window, ' ');
4928 		if (view_needs_focus_indication(view))
4929 			wstandend(view->window);
4930 
4931 		if (max_lines <= 1)
4932 			return NULL;
4933 		max_lines--;
4934 	}
4935 
4936 	s->eof = 0;
4937 	view->maxx = 0;
4938 	line = NULL;
4939 	while (max_lines > 0 && nprinted < max_lines) {
4940 		enum got_diff_line_type linetype;
4941 		attr_t attr = 0;
4942 
4943 		linelen = getline(&line, &linesize, s->f);
4944 		if (linelen == -1) {
4945 			if (feof(s->f)) {
4946 				s->eof = 1;
4947 				break;
4948 			}
4949 			free(line);
4950 			return got_ferror(s->f, GOT_ERR_IO);
4951 		}
4952 
4953 		if (++s->lineno < s->first_displayed_line)
4954 			continue;
4955 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4956 			continue;
4957 		if (s->lineno == view->hiline)
4958 			attr = A_STANDOUT;
4959 
4960 		/* Set view->maxx based on full line length. */
4961 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4962 		    view->x ? 1 : 0);
4963 		if (err) {
4964 			free(line);
4965 			return err;
4966 		}
4967 		view->maxx = MAX(view->maxx, width);
4968 		free(wline);
4969 		wline = NULL;
4970 
4971 		linetype = s->lines[s->lineno].type;
4972 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4973 		    linetype < GOT_DIFF_LINE_CONTEXT)
4974 			attr |= COLOR_PAIR(linetype);
4975 		if (attr)
4976 			wattron(view->window, attr);
4977 		if (s->first_displayed_line + nprinted == s->matched_line &&
4978 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4979 			err = add_matched_line(&width, line, view->ncols, 0,
4980 			    view->window, view->x, regmatch);
4981 			if (err) {
4982 				free(line);
4983 				return err;
4984 			}
4985 		} else {
4986 			int skip;
4987 			err = format_line(&wline, &width, &skip, line,
4988 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4989 			if (err) {
4990 				free(line);
4991 				return err;
4992 			}
4993 			waddwstr(view->window, &wline[skip]);
4994 			free(wline);
4995 			wline = NULL;
4996 		}
4997 		if (s->lineno == view->hiline) {
4998 			/* highlight full gline length */
4999 			while (width++ < view->ncols)
5000 				waddch(view->window, ' ');
5001 		} else {
5002 			if (width <= view->ncols - 1)
5003 				waddch(view->window, '\n');
5004 		}
5005 		if (attr)
5006 			wattroff(view->window, attr);
5007 		if (++nprinted == 1)
5008 			s->first_displayed_line = s->lineno;
5009 	}
5010 	free(line);
5011 	if (nprinted >= 1)
5012 		s->last_displayed_line = s->first_displayed_line +
5013 		    (nprinted - 1);
5014 	else
5015 		s->last_displayed_line = s->first_displayed_line;
5016 
5017 	view_border(view);
5018 
5019 	if (s->eof) {
5020 		while (nprinted < view->nlines) {
5021 			waddch(view->window, '\n');
5022 			nprinted++;
5023 		}
5024 
5025 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5026 		    view->ncols, 0, 0);
5027 		if (err) {
5028 			return err;
5029 		}
5030 
5031 		wstandout(view->window);
5032 		waddwstr(view->window, wline);
5033 		free(wline);
5034 		wline = NULL;
5035 		wstandend(view->window);
5036 	}
5037 
5038 	return NULL;
5039 }
5040 
5041 static char *
5042 get_datestr(time_t *time, char *datebuf)
5043 {
5044 	struct tm mytm, *tm;
5045 	char *p, *s;
5046 
5047 	tm = gmtime_r(time, &mytm);
5048 	if (tm == NULL)
5049 		return NULL;
5050 	s = asctime_r(tm, datebuf);
5051 	if (s == NULL)
5052 		return NULL;
5053 	p = strchr(s, '\n');
5054 	if (p)
5055 		*p = '\0';
5056 	return s;
5057 }
5058 
5059 static const struct got_error *
5060 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5061     off_t off, uint8_t type)
5062 {
5063 	struct got_diff_line *p;
5064 
5065 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5066 	if (p == NULL)
5067 		return got_error_from_errno("reallocarray");
5068 	*lines = p;
5069 	(*lines)[*nlines].offset = off;
5070 	(*lines)[*nlines].type = type;
5071 	(*nlines)++;
5072 
5073 	return NULL;
5074 }
5075 
5076 static const struct got_error *
5077 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5078     struct got_diff_line *s_lines, size_t s_nlines)
5079 {
5080 	struct got_diff_line	*p;
5081 	char			 buf[BUFSIZ];
5082 	size_t			 i, r;
5083 
5084 	if (fseeko(src, 0L, SEEK_SET) == -1)
5085 		return got_error_from_errno("fseeko");
5086 
5087 	for (;;) {
5088 		r = fread(buf, 1, sizeof(buf), src);
5089 		if (r == 0) {
5090 			if (ferror(src))
5091 				return got_error_from_errno("fread");
5092 			if (feof(src))
5093 				break;
5094 		}
5095 		if (fwrite(buf, 1, r, dst) != r)
5096 			return got_ferror(dst, GOT_ERR_IO);
5097 	}
5098 
5099 	if (s_nlines == 0 && *d_nlines == 0)
5100 		return NULL;
5101 
5102 	/*
5103 	 * If commit info was in dst, increment line offsets
5104 	 * of the appended diff content, but skip s_lines[0]
5105 	 * because offset zero is already in *d_lines.
5106 	 */
5107 	if (*d_nlines > 0) {
5108 		for (i = 1; i < s_nlines; ++i)
5109 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5110 
5111 		if (s_nlines > 0) {
5112 			--s_nlines;
5113 			++s_lines;
5114 		}
5115 	}
5116 
5117 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5118 	if (p == NULL) {
5119 		/* d_lines is freed in close_diff_view() */
5120 		return got_error_from_errno("reallocarray");
5121 	}
5122 
5123 	*d_lines = p;
5124 
5125 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5126 	*d_nlines += s_nlines;
5127 
5128 	return NULL;
5129 }
5130 
5131 static const struct got_error *
5132 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5133     struct got_object_id *commit_id, struct got_reflist_head *refs,
5134     struct got_repository *repo, int ignore_ws, int force_text_diff,
5135     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5136 {
5137 	const struct got_error *err = NULL;
5138 	char datebuf[26], *datestr;
5139 	struct got_commit_object *commit;
5140 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5141 	time_t committer_time;
5142 	const char *author, *committer;
5143 	char *refs_str = NULL;
5144 	struct got_pathlist_entry *pe;
5145 	off_t outoff = 0;
5146 	int n;
5147 
5148 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5149 	if (err)
5150 		return err;
5151 
5152 	err = got_object_open_as_commit(&commit, repo, commit_id);
5153 	if (err)
5154 		return err;
5155 
5156 	err = got_object_id_str(&id_str, commit_id);
5157 	if (err) {
5158 		err = got_error_from_errno("got_object_id_str");
5159 		goto done;
5160 	}
5161 
5162 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5163 	if (err)
5164 		goto done;
5165 
5166 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5167 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5168 	if (n < 0) {
5169 		err = got_error_from_errno("fprintf");
5170 		goto done;
5171 	}
5172 	outoff += n;
5173 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5174 	if (err)
5175 		goto done;
5176 
5177 	n = fprintf(outfile, "from: %s\n",
5178 	    got_object_commit_get_author(commit));
5179 	if (n < 0) {
5180 		err = got_error_from_errno("fprintf");
5181 		goto done;
5182 	}
5183 	outoff += n;
5184 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5185 	if (err)
5186 		goto done;
5187 
5188 	author = got_object_commit_get_author(commit);
5189 	committer = got_object_commit_get_committer(commit);
5190 	if (strcmp(author, committer) != 0) {
5191 		n = fprintf(outfile, "via: %s\n", committer);
5192 		if (n < 0) {
5193 			err = got_error_from_errno("fprintf");
5194 			goto done;
5195 		}
5196 		outoff += n;
5197 		err = add_line_metadata(lines, nlines, outoff,
5198 		    GOT_DIFF_LINE_AUTHOR);
5199 		if (err)
5200 			goto done;
5201 	}
5202 	committer_time = got_object_commit_get_committer_time(commit);
5203 	datestr = get_datestr(&committer_time, datebuf);
5204 	if (datestr) {
5205 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5206 		if (n < 0) {
5207 			err = got_error_from_errno("fprintf");
5208 			goto done;
5209 		}
5210 		outoff += n;
5211 		err = add_line_metadata(lines, nlines, outoff,
5212 		    GOT_DIFF_LINE_DATE);
5213 		if (err)
5214 			goto done;
5215 	}
5216 	if (got_object_commit_get_nparents(commit) > 1) {
5217 		const struct got_object_id_queue *parent_ids;
5218 		struct got_object_qid *qid;
5219 		int pn = 1;
5220 		parent_ids = got_object_commit_get_parent_ids(commit);
5221 		STAILQ_FOREACH(qid, parent_ids, entry) {
5222 			err = got_object_id_str(&id_str, &qid->id);
5223 			if (err)
5224 				goto done;
5225 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5226 			if (n < 0) {
5227 				err = got_error_from_errno("fprintf");
5228 				goto done;
5229 			}
5230 			outoff += n;
5231 			err = add_line_metadata(lines, nlines, outoff,
5232 			    GOT_DIFF_LINE_META);
5233 			if (err)
5234 				goto done;
5235 			free(id_str);
5236 			id_str = NULL;
5237 		}
5238 	}
5239 
5240 	err = got_object_commit_get_logmsg(&logmsg, commit);
5241 	if (err)
5242 		goto done;
5243 	s = logmsg;
5244 	while ((line = strsep(&s, "\n")) != NULL) {
5245 		n = fprintf(outfile, "%s\n", line);
5246 		if (n < 0) {
5247 			err = got_error_from_errno("fprintf");
5248 			goto done;
5249 		}
5250 		outoff += n;
5251 		err = add_line_metadata(lines, nlines, outoff,
5252 		    GOT_DIFF_LINE_LOGMSG);
5253 		if (err)
5254 			goto done;
5255 	}
5256 
5257 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5258 		struct got_diff_changed_path *cp = pe->data;
5259 		int pad = dsa->max_path_len - pe->path_len + 1;
5260 
5261 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5262 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5263 		    dsa->rm_cols + 1, cp->rm);
5264 		if (n < 0) {
5265 			err = got_error_from_errno("fprintf");
5266 			goto done;
5267 		}
5268 		outoff += n;
5269 		err = add_line_metadata(lines, nlines, outoff,
5270 		    GOT_DIFF_LINE_CHANGES);
5271 		if (err)
5272 			goto done;
5273 	}
5274 
5275 	fputc('\n', outfile);
5276 	outoff++;
5277 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5278 	if (err)
5279 		goto done;
5280 
5281 	n = fprintf(outfile,
5282 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5283 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5284 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5285 	if (n < 0) {
5286 		err = got_error_from_errno("fprintf");
5287 		goto done;
5288 	}
5289 	outoff += n;
5290 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5291 	if (err)
5292 		goto done;
5293 
5294 	fputc('\n', outfile);
5295 	outoff++;
5296 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5297 done:
5298 	free(id_str);
5299 	free(logmsg);
5300 	free(refs_str);
5301 	got_object_commit_close(commit);
5302 	if (err) {
5303 		free(*lines);
5304 		*lines = NULL;
5305 		*nlines = 0;
5306 	}
5307 	return err;
5308 }
5309 
5310 static const struct got_error *
5311 create_diff(struct tog_diff_view_state *s)
5312 {
5313 	const struct got_error *err = NULL;
5314 	FILE *f = NULL, *tmp_diff_file = NULL;
5315 	int obj_type;
5316 	struct got_diff_line *lines = NULL;
5317 	struct got_pathlist_head changed_paths;
5318 
5319 	TAILQ_INIT(&changed_paths);
5320 
5321 	free(s->lines);
5322 	s->lines = malloc(sizeof(*s->lines));
5323 	if (s->lines == NULL)
5324 		return got_error_from_errno("malloc");
5325 	s->nlines = 0;
5326 
5327 	f = got_opentemp();
5328 	if (f == NULL) {
5329 		err = got_error_from_errno("got_opentemp");
5330 		goto done;
5331 	}
5332 	tmp_diff_file = got_opentemp();
5333 	if (tmp_diff_file == NULL) {
5334 		err = got_error_from_errno("got_opentemp");
5335 		goto done;
5336 	}
5337 	if (s->f && fclose(s->f) == EOF) {
5338 		err = got_error_from_errno("fclose");
5339 		goto done;
5340 	}
5341 	s->f = f;
5342 
5343 	if (s->id1)
5344 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5345 	else
5346 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5347 	if (err)
5348 		goto done;
5349 
5350 	switch (obj_type) {
5351 	case GOT_OBJ_TYPE_BLOB:
5352 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5353 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5354 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5355 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5356 		    s->f);
5357 		break;
5358 	case GOT_OBJ_TYPE_TREE:
5359 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5360 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5361 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5362 		    s->force_text_diff, NULL, s->repo, s->f);
5363 		break;
5364 	case GOT_OBJ_TYPE_COMMIT: {
5365 		const struct got_object_id_queue *parent_ids;
5366 		struct got_object_qid *pid;
5367 		struct got_commit_object *commit2;
5368 		struct got_reflist_head *refs;
5369 		size_t nlines = 0;
5370 		struct got_diffstat_cb_arg dsa = {
5371 			0, 0, 0, 0, 0, 0,
5372 			&changed_paths,
5373 			s->ignore_whitespace,
5374 			s->force_text_diff,
5375 			tog_diff_algo
5376 		};
5377 
5378 		lines = malloc(sizeof(*lines));
5379 		if (lines == NULL) {
5380 			err = got_error_from_errno("malloc");
5381 			goto done;
5382 		}
5383 
5384 		/* build diff first in tmp file then append to commit info */
5385 		err = got_diff_objects_as_commits(&lines, &nlines,
5386 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5387 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5388 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5389 		if (err)
5390 			break;
5391 
5392 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5393 		if (err)
5394 			goto done;
5395 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5396 		/* Show commit info if we're diffing to a parent/root commit. */
5397 		if (s->id1 == NULL) {
5398 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5399 			    refs, s->repo, s->ignore_whitespace,
5400 			    s->force_text_diff, &dsa, s->f);
5401 			if (err)
5402 				goto done;
5403 		} else {
5404 			parent_ids = got_object_commit_get_parent_ids(commit2);
5405 			STAILQ_FOREACH(pid, parent_ids, entry) {
5406 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5407 					err = write_commit_info(&s->lines,
5408 					    &s->nlines, s->id2, refs, s->repo,
5409 					    s->ignore_whitespace,
5410 					    s->force_text_diff, &dsa, s->f);
5411 					if (err)
5412 						goto done;
5413 					break;
5414 				}
5415 			}
5416 		}
5417 		got_object_commit_close(commit2);
5418 
5419 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5420 		    lines, nlines);
5421 		break;
5422 	}
5423 	default:
5424 		err = got_error(GOT_ERR_OBJ_TYPE);
5425 		break;
5426 	}
5427 done:
5428 	free(lines);
5429 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5430 	if (s->f && fflush(s->f) != 0 && err == NULL)
5431 		err = got_error_from_errno("fflush");
5432 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5433 		err = got_error_from_errno("fclose");
5434 	return err;
5435 }
5436 
5437 static void
5438 diff_view_indicate_progress(struct tog_view *view)
5439 {
5440 	mvwaddstr(view->window, 0, 0, "diffing...");
5441 	update_panels();
5442 	doupdate();
5443 }
5444 
5445 static const struct got_error *
5446 search_start_diff_view(struct tog_view *view)
5447 {
5448 	struct tog_diff_view_state *s = &view->state.diff;
5449 
5450 	s->matched_line = 0;
5451 	return NULL;
5452 }
5453 
5454 static void
5455 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5456     size_t *nlines, int **first, int **last, int **match, int **selected)
5457 {
5458 	struct tog_diff_view_state *s = &view->state.diff;
5459 
5460 	*f = s->f;
5461 	*nlines = s->nlines;
5462 	*line_offsets = NULL;
5463 	*match = &s->matched_line;
5464 	*first = &s->first_displayed_line;
5465 	*last = &s->last_displayed_line;
5466 	*selected = &s->selected_line;
5467 }
5468 
5469 static const struct got_error *
5470 search_next_view_match(struct tog_view *view)
5471 {
5472 	const struct got_error *err = NULL;
5473 	FILE *f;
5474 	int lineno;
5475 	char *line = NULL;
5476 	size_t linesize = 0;
5477 	ssize_t linelen;
5478 	off_t *line_offsets;
5479 	size_t nlines = 0;
5480 	int *first, *last, *match, *selected;
5481 
5482 	if (!view->search_setup)
5483 		return got_error_msg(GOT_ERR_NOT_IMPL,
5484 		    "view search not supported");
5485 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5486 	    &match, &selected);
5487 
5488 	if (!view->searching) {
5489 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5490 		return NULL;
5491 	}
5492 
5493 	if (*match) {
5494 		if (view->searching == TOG_SEARCH_FORWARD)
5495 			lineno = *first + 1;
5496 		else
5497 			lineno = *first - 1;
5498 	} else
5499 		lineno = *first - 1 + *selected;
5500 
5501 	while (1) {
5502 		off_t offset;
5503 
5504 		if (lineno <= 0 || lineno > nlines) {
5505 			if (*match == 0) {
5506 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5507 				break;
5508 			}
5509 
5510 			if (view->searching == TOG_SEARCH_FORWARD)
5511 				lineno = 1;
5512 			else
5513 				lineno = nlines;
5514 		}
5515 
5516 		offset = view->type == TOG_VIEW_DIFF ?
5517 		    view->state.diff.lines[lineno - 1].offset :
5518 		    line_offsets[lineno - 1];
5519 		if (fseeko(f, offset, SEEK_SET) != 0) {
5520 			free(line);
5521 			return got_error_from_errno("fseeko");
5522 		}
5523 		linelen = getline(&line, &linesize, f);
5524 		if (linelen != -1) {
5525 			char *exstr;
5526 			err = expand_tab(&exstr, line);
5527 			if (err)
5528 				break;
5529 			if (match_line(exstr, &view->regex, 1,
5530 			    &view->regmatch)) {
5531 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5532 				*match = lineno;
5533 				free(exstr);
5534 				break;
5535 			}
5536 			free(exstr);
5537 		}
5538 		if (view->searching == TOG_SEARCH_FORWARD)
5539 			lineno++;
5540 		else
5541 			lineno--;
5542 	}
5543 	free(line);
5544 
5545 	if (*match) {
5546 		*first = *match;
5547 		*selected = 1;
5548 	}
5549 
5550 	return err;
5551 }
5552 
5553 static const struct got_error *
5554 close_diff_view(struct tog_view *view)
5555 {
5556 	const struct got_error *err = NULL;
5557 	struct tog_diff_view_state *s = &view->state.diff;
5558 
5559 	free(s->id1);
5560 	s->id1 = NULL;
5561 	free(s->id2);
5562 	s->id2 = NULL;
5563 	if (s->f && fclose(s->f) == EOF)
5564 		err = got_error_from_errno("fclose");
5565 	s->f = NULL;
5566 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5567 		err = got_error_from_errno("fclose");
5568 	s->f1 = NULL;
5569 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5570 		err = got_error_from_errno("fclose");
5571 	s->f2 = NULL;
5572 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5573 		err = got_error_from_errno("close");
5574 	s->fd1 = -1;
5575 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5576 		err = got_error_from_errno("close");
5577 	s->fd2 = -1;
5578 	free(s->lines);
5579 	s->lines = NULL;
5580 	s->nlines = 0;
5581 	return err;
5582 }
5583 
5584 static const struct got_error *
5585 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5586     struct got_object_id *id2, const char *label1, const char *label2,
5587     int diff_context, int ignore_whitespace, int force_text_diff,
5588     struct tog_view *parent_view, struct got_repository *repo)
5589 {
5590 	const struct got_error *err;
5591 	struct tog_diff_view_state *s = &view->state.diff;
5592 
5593 	memset(s, 0, sizeof(*s));
5594 	s->fd1 = -1;
5595 	s->fd2 = -1;
5596 
5597 	if (id1 != NULL && id2 != NULL) {
5598 		int type1, type2;
5599 
5600 		err = got_object_get_type(&type1, repo, id1);
5601 		if (err)
5602 			goto done;
5603 		err = got_object_get_type(&type2, repo, id2);
5604 		if (err)
5605 			goto done;
5606 
5607 		if (type1 != type2) {
5608 			err = got_error(GOT_ERR_OBJ_TYPE);
5609 			goto done;
5610 		}
5611 	}
5612 	s->first_displayed_line = 1;
5613 	s->last_displayed_line = view->nlines;
5614 	s->selected_line = 1;
5615 	s->repo = repo;
5616 	s->id1 = id1;
5617 	s->id2 = id2;
5618 	s->label1 = label1;
5619 	s->label2 = label2;
5620 
5621 	if (id1) {
5622 		s->id1 = got_object_id_dup(id1);
5623 		if (s->id1 == NULL) {
5624 			err = got_error_from_errno("got_object_id_dup");
5625 			goto done;
5626 		}
5627 	} else
5628 		s->id1 = NULL;
5629 
5630 	s->id2 = got_object_id_dup(id2);
5631 	if (s->id2 == NULL) {
5632 		err = got_error_from_errno("got_object_id_dup");
5633 		goto done;
5634 	}
5635 
5636 	s->f1 = got_opentemp();
5637 	if (s->f1 == NULL) {
5638 		err = got_error_from_errno("got_opentemp");
5639 		goto done;
5640 	}
5641 
5642 	s->f2 = got_opentemp();
5643 	if (s->f2 == NULL) {
5644 		err = got_error_from_errno("got_opentemp");
5645 		goto done;
5646 	}
5647 
5648 	s->fd1 = got_opentempfd();
5649 	if (s->fd1 == -1) {
5650 		err = got_error_from_errno("got_opentempfd");
5651 		goto done;
5652 	}
5653 
5654 	s->fd2 = got_opentempfd();
5655 	if (s->fd2 == -1) {
5656 		err = got_error_from_errno("got_opentempfd");
5657 		goto done;
5658 	}
5659 
5660 	s->diff_context = diff_context;
5661 	s->ignore_whitespace = ignore_whitespace;
5662 	s->force_text_diff = force_text_diff;
5663 	s->parent_view = parent_view;
5664 	s->repo = repo;
5665 
5666 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5667 		int rc;
5668 
5669 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5670 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5671 		if (rc != ERR)
5672 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5673 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5674 		if (rc != ERR)
5675 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5676 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5677 		if (rc != ERR)
5678 			rc = init_pair(GOT_DIFF_LINE_META,
5679 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5680 		if (rc != ERR)
5681 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5682 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5683 		if (rc != ERR)
5684 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5685 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5686 		if (rc != ERR)
5687 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5688 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5689 		if (rc != ERR)
5690 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5691 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5692 		if (rc != ERR)
5693 			rc = init_pair(GOT_DIFF_LINE_DATE,
5694 			    get_color_value("TOG_COLOR_DATE"), -1);
5695 		if (rc == ERR) {
5696 			err = got_error(GOT_ERR_RANGE);
5697 			goto done;
5698 		}
5699 	}
5700 
5701 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5702 	    view_is_splitscreen(view))
5703 		show_log_view(parent_view); /* draw border */
5704 	diff_view_indicate_progress(view);
5705 
5706 	err = create_diff(s);
5707 
5708 	view->show = show_diff_view;
5709 	view->input = input_diff_view;
5710 	view->reset = reset_diff_view;
5711 	view->close = close_diff_view;
5712 	view->search_start = search_start_diff_view;
5713 	view->search_setup = search_setup_diff_view;
5714 	view->search_next = search_next_view_match;
5715 done:
5716 	if (err) {
5717 		if (view->close == NULL)
5718 			close_diff_view(view);
5719 		view_close(view);
5720 	}
5721 	return err;
5722 }
5723 
5724 static const struct got_error *
5725 show_diff_view(struct tog_view *view)
5726 {
5727 	const struct got_error *err;
5728 	struct tog_diff_view_state *s = &view->state.diff;
5729 	char *id_str1 = NULL, *id_str2, *header;
5730 	const char *label1, *label2;
5731 
5732 	if (s->id1) {
5733 		err = got_object_id_str(&id_str1, s->id1);
5734 		if (err)
5735 			return err;
5736 		label1 = s->label1 ? s->label1 : id_str1;
5737 	} else
5738 		label1 = "/dev/null";
5739 
5740 	err = got_object_id_str(&id_str2, s->id2);
5741 	if (err)
5742 		return err;
5743 	label2 = s->label2 ? s->label2 : id_str2;
5744 
5745 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5746 		err = got_error_from_errno("asprintf");
5747 		free(id_str1);
5748 		free(id_str2);
5749 		return err;
5750 	}
5751 	free(id_str1);
5752 	free(id_str2);
5753 
5754 	err = draw_file(view, header);
5755 	free(header);
5756 	return err;
5757 }
5758 
5759 static const struct got_error *
5760 set_selected_commit(struct tog_diff_view_state *s,
5761     struct commit_queue_entry *entry)
5762 {
5763 	const struct got_error *err;
5764 	const struct got_object_id_queue *parent_ids;
5765 	struct got_commit_object *selected_commit;
5766 	struct got_object_qid *pid;
5767 
5768 	free(s->id2);
5769 	s->id2 = got_object_id_dup(entry->id);
5770 	if (s->id2 == NULL)
5771 		return got_error_from_errno("got_object_id_dup");
5772 
5773 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5774 	if (err)
5775 		return err;
5776 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5777 	free(s->id1);
5778 	pid = STAILQ_FIRST(parent_ids);
5779 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5780 	got_object_commit_close(selected_commit);
5781 	return NULL;
5782 }
5783 
5784 static const struct got_error *
5785 reset_diff_view(struct tog_view *view)
5786 {
5787 	struct tog_diff_view_state *s = &view->state.diff;
5788 
5789 	view->count = 0;
5790 	wclear(view->window);
5791 	s->first_displayed_line = 1;
5792 	s->last_displayed_line = view->nlines;
5793 	s->matched_line = 0;
5794 	diff_view_indicate_progress(view);
5795 	return create_diff(s);
5796 }
5797 
5798 static void
5799 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5800 {
5801 	int start, i;
5802 
5803 	i = start = s->first_displayed_line - 1;
5804 
5805 	while (s->lines[i].type != type) {
5806 		if (i == 0)
5807 			i = s->nlines - 1;
5808 		if (--i == start)
5809 			return; /* do nothing, requested type not in file */
5810 	}
5811 
5812 	s->selected_line = 1;
5813 	s->first_displayed_line = i;
5814 }
5815 
5816 static void
5817 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5818 {
5819 	int start, i;
5820 
5821 	i = start = s->first_displayed_line + 1;
5822 
5823 	while (s->lines[i].type != type) {
5824 		if (i == s->nlines - 1)
5825 			i = 0;
5826 		if (++i == start)
5827 			return; /* do nothing, requested type not in file */
5828 	}
5829 
5830 	s->selected_line = 1;
5831 	s->first_displayed_line = i;
5832 }
5833 
5834 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5835     int, int, int);
5836 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5837     int, int);
5838 
5839 static const struct got_error *
5840 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5841 {
5842 	const struct got_error *err = NULL;
5843 	struct tog_diff_view_state *s = &view->state.diff;
5844 	struct tog_log_view_state *ls;
5845 	struct commit_queue_entry *old_selected_entry;
5846 	char *line = NULL;
5847 	size_t linesize = 0;
5848 	ssize_t linelen;
5849 	int i, nscroll = view->nlines - 1, up = 0;
5850 
5851 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5852 
5853 	switch (ch) {
5854 	case '0':
5855 	case '$':
5856 	case KEY_RIGHT:
5857 	case 'l':
5858 	case KEY_LEFT:
5859 	case 'h':
5860 		horizontal_scroll_input(view, ch);
5861 		break;
5862 	case 'a':
5863 	case 'w':
5864 		if (ch == 'a') {
5865 			s->force_text_diff = !s->force_text_diff;
5866 			view->action = s->force_text_diff ?
5867 			    "force ASCII text enabled" :
5868 			    "force ASCII text disabled";
5869 		}
5870 		else if (ch == 'w') {
5871 			s->ignore_whitespace = !s->ignore_whitespace;
5872 			view->action = s->ignore_whitespace ?
5873 			    "ignore whitespace enabled" :
5874 			    "ignore whitespace disabled";
5875 		}
5876 		err = reset_diff_view(view);
5877 		break;
5878 	case 'g':
5879 	case KEY_HOME:
5880 		s->first_displayed_line = 1;
5881 		view->count = 0;
5882 		break;
5883 	case 'G':
5884 	case KEY_END:
5885 		view->count = 0;
5886 		if (s->eof)
5887 			break;
5888 
5889 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5890 		s->eof = 1;
5891 		break;
5892 	case 'k':
5893 	case KEY_UP:
5894 	case CTRL('p'):
5895 		if (s->first_displayed_line > 1)
5896 			s->first_displayed_line--;
5897 		else
5898 			view->count = 0;
5899 		break;
5900 	case CTRL('u'):
5901 	case 'u':
5902 		nscroll /= 2;
5903 		/* FALL THROUGH */
5904 	case KEY_PPAGE:
5905 	case CTRL('b'):
5906 	case 'b':
5907 		if (s->first_displayed_line == 1) {
5908 			view->count = 0;
5909 			break;
5910 		}
5911 		i = 0;
5912 		while (i++ < nscroll && s->first_displayed_line > 1)
5913 			s->first_displayed_line--;
5914 		break;
5915 	case 'j':
5916 	case KEY_DOWN:
5917 	case CTRL('n'):
5918 		if (!s->eof)
5919 			s->first_displayed_line++;
5920 		else
5921 			view->count = 0;
5922 		break;
5923 	case CTRL('d'):
5924 	case 'd':
5925 		nscroll /= 2;
5926 		/* FALL THROUGH */
5927 	case KEY_NPAGE:
5928 	case CTRL('f'):
5929 	case 'f':
5930 	case ' ':
5931 		if (s->eof) {
5932 			view->count = 0;
5933 			break;
5934 		}
5935 		i = 0;
5936 		while (!s->eof && i++ < nscroll) {
5937 			linelen = getline(&line, &linesize, s->f);
5938 			s->first_displayed_line++;
5939 			if (linelen == -1) {
5940 				if (feof(s->f)) {
5941 					s->eof = 1;
5942 				} else
5943 					err = got_ferror(s->f, GOT_ERR_IO);
5944 				break;
5945 			}
5946 		}
5947 		free(line);
5948 		break;
5949 	case '(':
5950 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5951 		break;
5952 	case ')':
5953 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5954 		break;
5955 	case '{':
5956 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5957 		break;
5958 	case '}':
5959 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5960 		break;
5961 	case '[':
5962 		if (s->diff_context > 0) {
5963 			s->diff_context--;
5964 			s->matched_line = 0;
5965 			diff_view_indicate_progress(view);
5966 			err = create_diff(s);
5967 			if (s->first_displayed_line + view->nlines - 1 >
5968 			    s->nlines) {
5969 				s->first_displayed_line = 1;
5970 				s->last_displayed_line = view->nlines;
5971 			}
5972 		} else
5973 			view->count = 0;
5974 		break;
5975 	case ']':
5976 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5977 			s->diff_context++;
5978 			s->matched_line = 0;
5979 			diff_view_indicate_progress(view);
5980 			err = create_diff(s);
5981 		} else
5982 			view->count = 0;
5983 		break;
5984 	case '<':
5985 	case ',':
5986 	case 'K':
5987 		up = 1;
5988 		/* FALL THROUGH */
5989 	case '>':
5990 	case '.':
5991 	case 'J':
5992 		if (s->parent_view == NULL) {
5993 			view->count = 0;
5994 			break;
5995 		}
5996 		s->parent_view->count = view->count;
5997 
5998 		if (s->parent_view->type == TOG_VIEW_LOG) {
5999 			ls = &s->parent_view->state.log;
6000 			old_selected_entry = ls->selected_entry;
6001 
6002 			err = input_log_view(NULL, s->parent_view,
6003 			    up ? KEY_UP : KEY_DOWN);
6004 			if (err)
6005 				break;
6006 			view->count = s->parent_view->count;
6007 
6008 			if (old_selected_entry == ls->selected_entry)
6009 				break;
6010 
6011 			err = set_selected_commit(s, ls->selected_entry);
6012 			if (err)
6013 				break;
6014 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
6015 			struct tog_blame_view_state *bs;
6016 			struct got_object_id *id, *prev_id;
6017 
6018 			bs = &s->parent_view->state.blame;
6019 			prev_id = get_annotation_for_line(bs->blame.lines,
6020 			    bs->blame.nlines, bs->last_diffed_line);
6021 
6022 			err = input_blame_view(&view, s->parent_view,
6023 			    up ? KEY_UP : KEY_DOWN);
6024 			if (err)
6025 				break;
6026 			view->count = s->parent_view->count;
6027 
6028 			if (prev_id == NULL)
6029 				break;
6030 			id = get_selected_commit_id(bs->blame.lines,
6031 			    bs->blame.nlines, bs->first_displayed_line,
6032 			    bs->selected_line);
6033 			if (id == NULL)
6034 				break;
6035 
6036 			if (!got_object_id_cmp(prev_id, id))
6037 				break;
6038 
6039 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6040 			if (err)
6041 				break;
6042 		}
6043 		s->first_displayed_line = 1;
6044 		s->last_displayed_line = view->nlines;
6045 		s->matched_line = 0;
6046 		view->x = 0;
6047 
6048 		diff_view_indicate_progress(view);
6049 		err = create_diff(s);
6050 		break;
6051 	default:
6052 		view->count = 0;
6053 		break;
6054 	}
6055 
6056 	return err;
6057 }
6058 
6059 static const struct got_error *
6060 cmd_diff(int argc, char *argv[])
6061 {
6062 	const struct got_error *error;
6063 	struct got_repository *repo = NULL;
6064 	struct got_worktree *worktree = NULL;
6065 	struct got_object_id *id1 = NULL, *id2 = NULL;
6066 	char *repo_path = NULL, *cwd = NULL;
6067 	char *id_str1 = NULL, *id_str2 = NULL;
6068 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6069 	char *label1 = NULL, *label2 = NULL;
6070 	int diff_context = 3, ignore_whitespace = 0;
6071 	int ch, force_text_diff = 0;
6072 	const char *errstr;
6073 	struct tog_view *view;
6074 	int *pack_fds = NULL;
6075 
6076 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6077 		switch (ch) {
6078 		case 'a':
6079 			force_text_diff = 1;
6080 			break;
6081 		case 'C':
6082 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6083 			    &errstr);
6084 			if (errstr != NULL)
6085 				errx(1, "number of context lines is %s: %s",
6086 				    errstr, errstr);
6087 			break;
6088 		case 'r':
6089 			repo_path = realpath(optarg, NULL);
6090 			if (repo_path == NULL)
6091 				return got_error_from_errno2("realpath",
6092 				    optarg);
6093 			got_path_strip_trailing_slashes(repo_path);
6094 			break;
6095 		case 'w':
6096 			ignore_whitespace = 1;
6097 			break;
6098 		default:
6099 			usage_diff();
6100 			/* NOTREACHED */
6101 		}
6102 	}
6103 
6104 	argc -= optind;
6105 	argv += optind;
6106 
6107 	if (argc == 0) {
6108 		usage_diff(); /* TODO show local worktree changes */
6109 	} else if (argc == 2) {
6110 		id_str1 = argv[0];
6111 		id_str2 = argv[1];
6112 	} else
6113 		usage_diff();
6114 
6115 	error = got_repo_pack_fds_open(&pack_fds);
6116 	if (error)
6117 		goto done;
6118 
6119 	if (repo_path == NULL) {
6120 		cwd = getcwd(NULL, 0);
6121 		if (cwd == NULL)
6122 			return got_error_from_errno("getcwd");
6123 		error = got_worktree_open(&worktree, cwd, NULL);
6124 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6125 			goto done;
6126 		if (worktree)
6127 			repo_path =
6128 			    strdup(got_worktree_get_repo_path(worktree));
6129 		else
6130 			repo_path = strdup(cwd);
6131 		if (repo_path == NULL) {
6132 			error = got_error_from_errno("strdup");
6133 			goto done;
6134 		}
6135 	}
6136 
6137 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6138 	if (error)
6139 		goto done;
6140 
6141 	init_curses();
6142 
6143 	error = apply_unveil(got_repo_get_path(repo), NULL);
6144 	if (error)
6145 		goto done;
6146 
6147 	error = tog_load_refs(repo, 0);
6148 	if (error)
6149 		goto done;
6150 
6151 	if (id_str1 != NULL) {
6152 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6153 		    repo, worktree);
6154 		if (error != NULL)
6155 			goto done;
6156 		if (keyword_idstr1 != NULL)
6157 			id_str1 = keyword_idstr1;
6158 	}
6159 	if (id_str2 != NULL) {
6160 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6161 		    repo, worktree);
6162 		if (error != NULL)
6163 			goto done;
6164 		if (keyword_idstr2 != NULL)
6165 			id_str2 = keyword_idstr2;
6166 	}
6167 
6168 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6169 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6170 	if (error)
6171 		goto done;
6172 
6173 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6174 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6175 	if (error)
6176 		goto done;
6177 
6178 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6179 	if (view == NULL) {
6180 		error = got_error_from_errno("view_open");
6181 		goto done;
6182 	}
6183 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6184 	    ignore_whitespace, force_text_diff, NULL,  repo);
6185 	if (error)
6186 		goto done;
6187 
6188 	if (worktree) {
6189 		error = set_tog_base_commit(repo, worktree);
6190 		if (error != NULL)
6191 			goto done;
6192 	}
6193 
6194 	error = view_loop(view);
6195 
6196 done:
6197 	free(tog_base_commit.id);
6198 	free(keyword_idstr1);
6199 	free(keyword_idstr2);
6200 	free(label1);
6201 	free(label2);
6202 	free(repo_path);
6203 	free(cwd);
6204 	if (repo) {
6205 		const struct got_error *close_err = got_repo_close(repo);
6206 		if (error == NULL)
6207 			error = close_err;
6208 	}
6209 	if (worktree)
6210 		got_worktree_close(worktree);
6211 	if (pack_fds) {
6212 		const struct got_error *pack_err =
6213 		    got_repo_pack_fds_close(pack_fds);
6214 		if (error == NULL)
6215 			error = pack_err;
6216 	}
6217 	tog_free_refs();
6218 	return error;
6219 }
6220 
6221 __dead static void
6222 usage_blame(void)
6223 {
6224 	endwin();
6225 	fprintf(stderr,
6226 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6227 	    getprogname());
6228 	exit(1);
6229 }
6230 
6231 struct tog_blame_line {
6232 	int annotated;
6233 	struct got_object_id *id;
6234 };
6235 
6236 static const struct got_error *
6237 draw_blame(struct tog_view *view)
6238 {
6239 	struct tog_blame_view_state *s = &view->state.blame;
6240 	struct tog_blame *blame = &s->blame;
6241 	regmatch_t *regmatch = &view->regmatch;
6242 	const struct got_error *err;
6243 	int lineno = 0, nprinted = 0;
6244 	char *line = NULL;
6245 	size_t linesize = 0;
6246 	ssize_t linelen;
6247 	wchar_t *wline;
6248 	int width;
6249 	struct tog_blame_line *blame_line;
6250 	struct got_object_id *prev_id = NULL;
6251 	char *id_str;
6252 	struct tog_color *tc;
6253 
6254 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6255 	if (err)
6256 		return err;
6257 
6258 	rewind(blame->f);
6259 	werase(view->window);
6260 
6261 	if (asprintf(&line, "commit %s", id_str) == -1) {
6262 		err = got_error_from_errno("asprintf");
6263 		free(id_str);
6264 		return err;
6265 	}
6266 
6267 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6268 	free(line);
6269 	line = NULL;
6270 	if (err)
6271 		return err;
6272 	if (view_needs_focus_indication(view))
6273 		wstandout(view->window);
6274 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6275 	if (tc)
6276 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6277 	waddwstr(view->window, wline);
6278 	while (width++ < view->ncols)
6279 		waddch(view->window, ' ');
6280 	if (tc)
6281 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6282 	if (view_needs_focus_indication(view))
6283 		wstandend(view->window);
6284 	free(wline);
6285 	wline = NULL;
6286 
6287 	if (view->gline > blame->nlines)
6288 		view->gline = blame->nlines;
6289 
6290 	if (tog_io.wait_for_ui) {
6291 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6292 		int rc;
6293 
6294 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6295 		if (rc)
6296 			return got_error_set_errno(rc, "pthread_cond_wait");
6297 		tog_io.wait_for_ui = 0;
6298 	}
6299 
6300 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6301 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6302 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6303 		free(id_str);
6304 		return got_error_from_errno("asprintf");
6305 	}
6306 	free(id_str);
6307 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6308 	free(line);
6309 	line = NULL;
6310 	if (err)
6311 		return err;
6312 	waddwstr(view->window, wline);
6313 	free(wline);
6314 	wline = NULL;
6315 	if (width < view->ncols - 1)
6316 		waddch(view->window, '\n');
6317 
6318 	s->eof = 0;
6319 	view->maxx = 0;
6320 	while (nprinted < view->nlines - 2) {
6321 		linelen = getline(&line, &linesize, blame->f);
6322 		if (linelen == -1) {
6323 			if (feof(blame->f)) {
6324 				s->eof = 1;
6325 				break;
6326 			}
6327 			free(line);
6328 			return got_ferror(blame->f, GOT_ERR_IO);
6329 		}
6330 		if (++lineno < s->first_displayed_line)
6331 			continue;
6332 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6333 			continue;
6334 
6335 		/* Set view->maxx based on full line length. */
6336 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6337 		if (err) {
6338 			free(line);
6339 			return err;
6340 		}
6341 		free(wline);
6342 		wline = NULL;
6343 		view->maxx = MAX(view->maxx, width);
6344 
6345 		if (nprinted == s->selected_line - 1)
6346 			wstandout(view->window);
6347 
6348 		if (blame->nlines > 0) {
6349 			blame_line = &blame->lines[lineno - 1];
6350 			if (blame_line->annotated && prev_id &&
6351 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6352 			    !(nprinted == s->selected_line - 1)) {
6353 				waddstr(view->window, "        ");
6354 			} else if (blame_line->annotated) {
6355 				char *id_str;
6356 				err = got_object_id_str(&id_str,
6357 				    blame_line->id);
6358 				if (err) {
6359 					free(line);
6360 					return err;
6361 				}
6362 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6363 				if (tc)
6364 					wattr_on(view->window,
6365 					    COLOR_PAIR(tc->colorpair), NULL);
6366 				wprintw(view->window, "%.8s", id_str);
6367 				if (tc)
6368 					wattr_off(view->window,
6369 					    COLOR_PAIR(tc->colorpair), NULL);
6370 				free(id_str);
6371 				prev_id = blame_line->id;
6372 			} else {
6373 				waddstr(view->window, "........");
6374 				prev_id = NULL;
6375 			}
6376 		} else {
6377 			waddstr(view->window, "........");
6378 			prev_id = NULL;
6379 		}
6380 
6381 		if (nprinted == s->selected_line - 1)
6382 			wstandend(view->window);
6383 		waddstr(view->window, " ");
6384 
6385 		if (view->ncols <= 9) {
6386 			width = 9;
6387 		} else if (s->first_displayed_line + nprinted ==
6388 		    s->matched_line &&
6389 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6390 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6391 			    view->window, view->x, regmatch);
6392 			if (err) {
6393 				free(line);
6394 				return err;
6395 			}
6396 			width += 9;
6397 		} else {
6398 			int skip;
6399 			err = format_line(&wline, &width, &skip, line,
6400 			    view->x, view->ncols - 9, 9, 1);
6401 			if (err) {
6402 				free(line);
6403 				return err;
6404 			}
6405 			waddwstr(view->window, &wline[skip]);
6406 			width += 9;
6407 			free(wline);
6408 			wline = NULL;
6409 		}
6410 
6411 		if (width <= view->ncols - 1)
6412 			waddch(view->window, '\n');
6413 		if (++nprinted == 1)
6414 			s->first_displayed_line = lineno;
6415 	}
6416 	free(line);
6417 	s->last_displayed_line = lineno;
6418 
6419 	view_border(view);
6420 
6421 	return NULL;
6422 }
6423 
6424 static const struct got_error *
6425 blame_cb(void *arg, int nlines, int lineno,
6426     struct got_commit_object *commit, struct got_object_id *id)
6427 {
6428 	const struct got_error *err = NULL;
6429 	struct tog_blame_cb_args *a = arg;
6430 	struct tog_blame_line *line;
6431 	int errcode;
6432 
6433 	if (nlines != a->nlines ||
6434 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6435 		return got_error(GOT_ERR_RANGE);
6436 
6437 	errcode = pthread_mutex_lock(&tog_mutex);
6438 	if (errcode)
6439 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6440 
6441 	if (*a->quit) {	/* user has quit the blame view */
6442 		err = got_error(GOT_ERR_ITER_COMPLETED);
6443 		goto done;
6444 	}
6445 
6446 	if (lineno == -1)
6447 		goto done; /* no change in this commit */
6448 
6449 	line = &a->lines[lineno - 1];
6450 	if (line->annotated)
6451 		goto done;
6452 
6453 	line->id = got_object_id_dup(id);
6454 	if (line->id == NULL) {
6455 		err = got_error_from_errno("got_object_id_dup");
6456 		goto done;
6457 	}
6458 	line->annotated = 1;
6459 done:
6460 	errcode = pthread_mutex_unlock(&tog_mutex);
6461 	if (errcode)
6462 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6463 	return err;
6464 }
6465 
6466 static void *
6467 blame_thread(void *arg)
6468 {
6469 	const struct got_error *err, *close_err;
6470 	struct tog_blame_thread_args *ta = arg;
6471 	struct tog_blame_cb_args *a = ta->cb_args;
6472 	int errcode, fd1 = -1, fd2 = -1;
6473 	FILE *f1 = NULL, *f2 = NULL;
6474 
6475 	fd1 = got_opentempfd();
6476 	if (fd1 == -1)
6477 		return (void *)got_error_from_errno("got_opentempfd");
6478 
6479 	fd2 = got_opentempfd();
6480 	if (fd2 == -1) {
6481 		err = got_error_from_errno("got_opentempfd");
6482 		goto done;
6483 	}
6484 
6485 	f1 = got_opentemp();
6486 	if (f1 == NULL) {
6487 		err = (void *)got_error_from_errno("got_opentemp");
6488 		goto done;
6489 	}
6490 	f2 = got_opentemp();
6491 	if (f2 == NULL) {
6492 		err = (void *)got_error_from_errno("got_opentemp");
6493 		goto done;
6494 	}
6495 
6496 	err = block_signals_used_by_main_thread();
6497 	if (err)
6498 		goto done;
6499 
6500 	err = got_blame(ta->path, a->commit_id, ta->repo,
6501 	    tog_diff_algo, blame_cb, ta->cb_args,
6502 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6503 	if (err && err->code == GOT_ERR_CANCELLED)
6504 		err = NULL;
6505 
6506 	errcode = pthread_mutex_lock(&tog_mutex);
6507 	if (errcode) {
6508 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6509 		goto done;
6510 	}
6511 
6512 	close_err = got_repo_close(ta->repo);
6513 	if (err == NULL)
6514 		err = close_err;
6515 	ta->repo = NULL;
6516 	*ta->complete = 1;
6517 
6518 	if (tog_io.wait_for_ui) {
6519 		errcode = pthread_cond_signal(&ta->blame_complete);
6520 		if (errcode && err == NULL)
6521 			err = got_error_set_errno(errcode,
6522 			    "pthread_cond_signal");
6523 	}
6524 
6525 	errcode = pthread_mutex_unlock(&tog_mutex);
6526 	if (errcode && err == NULL)
6527 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6528 
6529 done:
6530 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6531 		err = got_error_from_errno("close");
6532 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6533 		err = got_error_from_errno("close");
6534 	if (f1 && fclose(f1) == EOF && err == NULL)
6535 		err = got_error_from_errno("fclose");
6536 	if (f2 && fclose(f2) == EOF && err == NULL)
6537 		err = got_error_from_errno("fclose");
6538 
6539 	return (void *)err;
6540 }
6541 
6542 static struct got_object_id *
6543 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6544     int first_displayed_line, int selected_line)
6545 {
6546 	struct tog_blame_line *line;
6547 
6548 	if (nlines <= 0)
6549 		return NULL;
6550 
6551 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6552 	if (!line->annotated)
6553 		return NULL;
6554 
6555 	return line->id;
6556 }
6557 
6558 static struct got_object_id *
6559 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6560     int lineno)
6561 {
6562 	struct tog_blame_line *line;
6563 
6564 	if (nlines <= 0 || lineno >= nlines)
6565 		return NULL;
6566 
6567 	line = &lines[lineno - 1];
6568 	if (!line->annotated)
6569 		return NULL;
6570 
6571 	return line->id;
6572 }
6573 
6574 static const struct got_error *
6575 stop_blame(struct tog_blame *blame)
6576 {
6577 	const struct got_error *err = NULL;
6578 	int i;
6579 
6580 	if (blame->thread) {
6581 		int errcode;
6582 		errcode = pthread_mutex_unlock(&tog_mutex);
6583 		if (errcode)
6584 			return got_error_set_errno(errcode,
6585 			    "pthread_mutex_unlock");
6586 		errcode = pthread_join(blame->thread, (void **)&err);
6587 		if (errcode)
6588 			return got_error_set_errno(errcode, "pthread_join");
6589 		errcode = pthread_mutex_lock(&tog_mutex);
6590 		if (errcode)
6591 			return got_error_set_errno(errcode,
6592 			    "pthread_mutex_lock");
6593 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6594 			err = NULL;
6595 		blame->thread = 0; //NULL;
6596 	}
6597 	if (blame->thread_args.repo) {
6598 		const struct got_error *close_err;
6599 		close_err = got_repo_close(blame->thread_args.repo);
6600 		if (err == NULL)
6601 			err = close_err;
6602 		blame->thread_args.repo = NULL;
6603 	}
6604 	if (blame->f) {
6605 		if (fclose(blame->f) == EOF && err == NULL)
6606 			err = got_error_from_errno("fclose");
6607 		blame->f = NULL;
6608 	}
6609 	if (blame->lines) {
6610 		for (i = 0; i < blame->nlines; i++)
6611 			free(blame->lines[i].id);
6612 		free(blame->lines);
6613 		blame->lines = NULL;
6614 	}
6615 	free(blame->cb_args.commit_id);
6616 	blame->cb_args.commit_id = NULL;
6617 	if (blame->pack_fds) {
6618 		const struct got_error *pack_err =
6619 		    got_repo_pack_fds_close(blame->pack_fds);
6620 		if (err == NULL)
6621 			err = pack_err;
6622 		blame->pack_fds = NULL;
6623 	}
6624 	free(blame->line_offsets);
6625 	blame->line_offsets = NULL;
6626 	return err;
6627 }
6628 
6629 static const struct got_error *
6630 cancel_blame_view(void *arg)
6631 {
6632 	const struct got_error *err = NULL;
6633 	int *done = arg;
6634 	int errcode;
6635 
6636 	errcode = pthread_mutex_lock(&tog_mutex);
6637 	if (errcode)
6638 		return got_error_set_errno(errcode,
6639 		    "pthread_mutex_unlock");
6640 
6641 	if (*done)
6642 		err = got_error(GOT_ERR_CANCELLED);
6643 
6644 	errcode = pthread_mutex_unlock(&tog_mutex);
6645 	if (errcode)
6646 		return got_error_set_errno(errcode,
6647 		    "pthread_mutex_lock");
6648 
6649 	return err;
6650 }
6651 
6652 static const struct got_error *
6653 run_blame(struct tog_view *view)
6654 {
6655 	struct tog_blame_view_state *s = &view->state.blame;
6656 	struct tog_blame *blame = &s->blame;
6657 	const struct got_error *err = NULL;
6658 	struct got_commit_object *commit = NULL;
6659 	struct got_blob_object *blob = NULL;
6660 	struct got_repository *thread_repo = NULL;
6661 	struct got_object_id *obj_id = NULL;
6662 	int obj_type, fd = -1;
6663 	int *pack_fds = NULL;
6664 
6665 	err = got_object_open_as_commit(&commit, s->repo,
6666 	    &s->blamed_commit->id);
6667 	if (err)
6668 		return err;
6669 
6670 	fd = got_opentempfd();
6671 	if (fd == -1) {
6672 		err = got_error_from_errno("got_opentempfd");
6673 		goto done;
6674 	}
6675 
6676 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6677 	if (err)
6678 		goto done;
6679 
6680 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6681 	if (err)
6682 		goto done;
6683 
6684 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6685 		err = got_error(GOT_ERR_OBJ_TYPE);
6686 		goto done;
6687 	}
6688 
6689 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6690 	if (err)
6691 		goto done;
6692 	blame->f = got_opentemp();
6693 	if (blame->f == NULL) {
6694 		err = got_error_from_errno("got_opentemp");
6695 		goto done;
6696 	}
6697 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6698 	    &blame->line_offsets, blame->f, blob);
6699 	if (err)
6700 		goto done;
6701 	if (blame->nlines == 0) {
6702 		s->blame_complete = 1;
6703 		goto done;
6704 	}
6705 
6706 	/* Don't include \n at EOF in the blame line count. */
6707 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6708 		blame->nlines--;
6709 
6710 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6711 	if (blame->lines == NULL) {
6712 		err = got_error_from_errno("calloc");
6713 		goto done;
6714 	}
6715 
6716 	err = got_repo_pack_fds_open(&pack_fds);
6717 	if (err)
6718 		goto done;
6719 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6720 	    pack_fds);
6721 	if (err)
6722 		goto done;
6723 
6724 	blame->pack_fds = pack_fds;
6725 	blame->cb_args.view = view;
6726 	blame->cb_args.lines = blame->lines;
6727 	blame->cb_args.nlines = blame->nlines;
6728 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6729 	if (blame->cb_args.commit_id == NULL) {
6730 		err = got_error_from_errno("got_object_id_dup");
6731 		goto done;
6732 	}
6733 	blame->cb_args.quit = &s->done;
6734 
6735 	blame->thread_args.path = s->path;
6736 	blame->thread_args.repo = thread_repo;
6737 	blame->thread_args.cb_args = &blame->cb_args;
6738 	blame->thread_args.complete = &s->blame_complete;
6739 	blame->thread_args.cancel_cb = cancel_blame_view;
6740 	blame->thread_args.cancel_arg = &s->done;
6741 	s->blame_complete = 0;
6742 
6743 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6744 		s->first_displayed_line = 1;
6745 		s->last_displayed_line = view->nlines;
6746 		s->selected_line = 1;
6747 	}
6748 	s->matched_line = 0;
6749 
6750 done:
6751 	if (commit)
6752 		got_object_commit_close(commit);
6753 	if (fd != -1 && close(fd) == -1 && err == NULL)
6754 		err = got_error_from_errno("close");
6755 	if (blob)
6756 		got_object_blob_close(blob);
6757 	free(obj_id);
6758 	if (err)
6759 		stop_blame(blame);
6760 	return err;
6761 }
6762 
6763 static const struct got_error *
6764 open_blame_view(struct tog_view *view, char *path,
6765     struct got_object_id *commit_id, struct got_repository *repo)
6766 {
6767 	const struct got_error *err = NULL;
6768 	struct tog_blame_view_state *s = &view->state.blame;
6769 
6770 	STAILQ_INIT(&s->blamed_commits);
6771 
6772 	s->path = strdup(path);
6773 	if (s->path == NULL)
6774 		return got_error_from_errno("strdup");
6775 
6776 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6777 	if (err) {
6778 		free(s->path);
6779 		return err;
6780 	}
6781 
6782 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6783 	s->first_displayed_line = 1;
6784 	s->last_displayed_line = view->nlines;
6785 	s->selected_line = 1;
6786 	s->blame_complete = 0;
6787 	s->repo = repo;
6788 	s->commit_id = commit_id;
6789 	memset(&s->blame, 0, sizeof(s->blame));
6790 
6791 	STAILQ_INIT(&s->colors);
6792 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6793 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6794 		    get_color_value("TOG_COLOR_COMMIT"));
6795 		if (err)
6796 			return err;
6797 	}
6798 
6799 	view->show = show_blame_view;
6800 	view->input = input_blame_view;
6801 	view->reset = reset_blame_view;
6802 	view->close = close_blame_view;
6803 	view->search_start = search_start_blame_view;
6804 	view->search_setup = search_setup_blame_view;
6805 	view->search_next = search_next_view_match;
6806 
6807 	if (using_mock_io) {
6808 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6809 		int rc;
6810 
6811 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6812 		if (rc)
6813 			return got_error_set_errno(rc, "pthread_cond_init");
6814 	}
6815 
6816 	return run_blame(view);
6817 }
6818 
6819 static const struct got_error *
6820 close_blame_view(struct tog_view *view)
6821 {
6822 	const struct got_error *err = NULL;
6823 	struct tog_blame_view_state *s = &view->state.blame;
6824 
6825 	if (s->blame.thread)
6826 		err = stop_blame(&s->blame);
6827 
6828 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6829 		struct got_object_qid *blamed_commit;
6830 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6831 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6832 		got_object_qid_free(blamed_commit);
6833 	}
6834 
6835 	if (using_mock_io) {
6836 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6837 		int rc;
6838 
6839 		rc = pthread_cond_destroy(&bta->blame_complete);
6840 		if (rc && err == NULL)
6841 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6842 	}
6843 
6844 	free(s->path);
6845 	free_colors(&s->colors);
6846 	return err;
6847 }
6848 
6849 static const struct got_error *
6850 search_start_blame_view(struct tog_view *view)
6851 {
6852 	struct tog_blame_view_state *s = &view->state.blame;
6853 
6854 	s->matched_line = 0;
6855 	return NULL;
6856 }
6857 
6858 static void
6859 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6860     size_t *nlines, int **first, int **last, int **match, int **selected)
6861 {
6862 	struct tog_blame_view_state *s = &view->state.blame;
6863 
6864 	*f = s->blame.f;
6865 	*nlines = s->blame.nlines;
6866 	*line_offsets = s->blame.line_offsets;
6867 	*match = &s->matched_line;
6868 	*first = &s->first_displayed_line;
6869 	*last = &s->last_displayed_line;
6870 	*selected = &s->selected_line;
6871 }
6872 
6873 static const struct got_error *
6874 show_blame_view(struct tog_view *view)
6875 {
6876 	const struct got_error *err = NULL;
6877 	struct tog_blame_view_state *s = &view->state.blame;
6878 	int errcode;
6879 
6880 	if (s->blame.thread == 0 && !s->blame_complete) {
6881 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6882 		    &s->blame.thread_args);
6883 		if (errcode)
6884 			return got_error_set_errno(errcode, "pthread_create");
6885 
6886 		if (!using_mock_io)
6887 			halfdelay(1); /* fast refresh while annotating  */
6888 	}
6889 
6890 	if (s->blame_complete && !using_mock_io)
6891 		halfdelay(10); /* disable fast refresh */
6892 
6893 	err = draw_blame(view);
6894 
6895 	view_border(view);
6896 	return err;
6897 }
6898 
6899 static const struct got_error *
6900 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6901     struct got_repository *repo, struct got_object_id *id)
6902 {
6903 	struct tog_view		*log_view;
6904 	const struct got_error	*err = NULL;
6905 
6906 	*new_view = NULL;
6907 
6908 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6909 	if (log_view == NULL)
6910 		return got_error_from_errno("view_open");
6911 
6912 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6913 	if (err)
6914 		view_close(log_view);
6915 	else
6916 		*new_view = log_view;
6917 
6918 	return err;
6919 }
6920 
6921 static const struct got_error *
6922 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6923 {
6924 	const struct got_error *err = NULL, *thread_err = NULL;
6925 	struct tog_view *diff_view;
6926 	struct tog_blame_view_state *s = &view->state.blame;
6927 	int eos, nscroll, begin_y = 0, begin_x = 0;
6928 
6929 	eos = nscroll = view->nlines - 2;
6930 	if (view_is_hsplit_top(view))
6931 		--eos;  /* border */
6932 
6933 	switch (ch) {
6934 	case '0':
6935 	case '$':
6936 	case KEY_RIGHT:
6937 	case 'l':
6938 	case KEY_LEFT:
6939 	case 'h':
6940 		horizontal_scroll_input(view, ch);
6941 		break;
6942 	case 'q':
6943 		s->done = 1;
6944 		break;
6945 	case 'g':
6946 	case KEY_HOME:
6947 		s->selected_line = 1;
6948 		s->first_displayed_line = 1;
6949 		view->count = 0;
6950 		break;
6951 	case 'G':
6952 	case KEY_END:
6953 		if (s->blame.nlines < eos) {
6954 			s->selected_line = s->blame.nlines;
6955 			s->first_displayed_line = 1;
6956 		} else {
6957 			s->selected_line = eos;
6958 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6959 		}
6960 		view->count = 0;
6961 		break;
6962 	case 'k':
6963 	case KEY_UP:
6964 	case CTRL('p'):
6965 		if (s->selected_line > 1)
6966 			s->selected_line--;
6967 		else if (s->selected_line == 1 &&
6968 		    s->first_displayed_line > 1)
6969 			s->first_displayed_line--;
6970 		else
6971 			view->count = 0;
6972 		break;
6973 	case CTRL('u'):
6974 	case 'u':
6975 		nscroll /= 2;
6976 		/* FALL THROUGH */
6977 	case KEY_PPAGE:
6978 	case CTRL('b'):
6979 	case 'b':
6980 		if (s->first_displayed_line == 1) {
6981 			if (view->count > 1)
6982 				nscroll += nscroll;
6983 			s->selected_line = MAX(1, s->selected_line - nscroll);
6984 			view->count = 0;
6985 			break;
6986 		}
6987 		if (s->first_displayed_line > nscroll)
6988 			s->first_displayed_line -= nscroll;
6989 		else
6990 			s->first_displayed_line = 1;
6991 		break;
6992 	case 'j':
6993 	case KEY_DOWN:
6994 	case CTRL('n'):
6995 		if (s->selected_line < eos && s->first_displayed_line +
6996 		    s->selected_line <= s->blame.nlines)
6997 			s->selected_line++;
6998 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6999 			s->first_displayed_line++;
7000 		else
7001 			view->count = 0;
7002 		break;
7003 	case 'c':
7004 	case 'p': {
7005 		struct got_object_id *id = NULL;
7006 
7007 		view->count = 0;
7008 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7009 		    s->first_displayed_line, s->selected_line);
7010 		if (id == NULL)
7011 			break;
7012 		if (ch == 'p') {
7013 			struct got_commit_object *commit, *pcommit;
7014 			struct got_object_qid *pid;
7015 			struct got_object_id *blob_id = NULL;
7016 			int obj_type;
7017 			err = got_object_open_as_commit(&commit,
7018 			    s->repo, id);
7019 			if (err)
7020 				break;
7021 			pid = STAILQ_FIRST(
7022 			    got_object_commit_get_parent_ids(commit));
7023 			if (pid == NULL) {
7024 				got_object_commit_close(commit);
7025 				break;
7026 			}
7027 			/* Check if path history ends here. */
7028 			err = got_object_open_as_commit(&pcommit,
7029 			    s->repo, &pid->id);
7030 			if (err)
7031 				break;
7032 			err = got_object_id_by_path(&blob_id, s->repo,
7033 			    pcommit, s->path);
7034 			got_object_commit_close(pcommit);
7035 			if (err) {
7036 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7037 					err = NULL;
7038 				got_object_commit_close(commit);
7039 				break;
7040 			}
7041 			err = got_object_get_type(&obj_type, s->repo,
7042 			    blob_id);
7043 			free(blob_id);
7044 			/* Can't blame non-blob type objects. */
7045 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7046 				got_object_commit_close(commit);
7047 				break;
7048 			}
7049 			err = got_object_qid_alloc(&s->blamed_commit,
7050 			    &pid->id);
7051 			got_object_commit_close(commit);
7052 		} else {
7053 			if (got_object_id_cmp(id,
7054 			    &s->blamed_commit->id) == 0)
7055 				break;
7056 			err = got_object_qid_alloc(&s->blamed_commit,
7057 			    id);
7058 		}
7059 		if (err)
7060 			break;
7061 		s->done = 1;
7062 		thread_err = stop_blame(&s->blame);
7063 		s->done = 0;
7064 		if (thread_err)
7065 			break;
7066 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7067 		    s->blamed_commit, entry);
7068 		err = run_blame(view);
7069 		if (err)
7070 			break;
7071 		break;
7072 	}
7073 	case 'C': {
7074 		struct got_object_qid *first;
7075 
7076 		view->count = 0;
7077 		first = STAILQ_FIRST(&s->blamed_commits);
7078 		if (!got_object_id_cmp(&first->id, s->commit_id))
7079 			break;
7080 		s->done = 1;
7081 		thread_err = stop_blame(&s->blame);
7082 		s->done = 0;
7083 		if (thread_err)
7084 			break;
7085 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7086 		got_object_qid_free(s->blamed_commit);
7087 		s->blamed_commit =
7088 		    STAILQ_FIRST(&s->blamed_commits);
7089 		err = run_blame(view);
7090 		if (err)
7091 			break;
7092 		break;
7093 	}
7094 	case 'L':
7095 		view->count = 0;
7096 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7097 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7098 		if (s->id_to_log)
7099 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7100 		break;
7101 	case KEY_ENTER:
7102 	case '\r': {
7103 		struct got_object_id *id = NULL;
7104 		struct got_object_qid *pid;
7105 		struct got_commit_object *commit = NULL;
7106 
7107 		view->count = 0;
7108 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7109 		    s->first_displayed_line, s->selected_line);
7110 		if (id == NULL)
7111 			break;
7112 		err = got_object_open_as_commit(&commit, s->repo, id);
7113 		if (err)
7114 			break;
7115 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7116 		if (*new_view) {
7117 			/* traversed from diff view, release diff resources  */
7118 			err = close_diff_view(*new_view);
7119 			if (err)
7120 				break;
7121 			diff_view = *new_view;
7122 		} else {
7123 			if (view_is_parent_view(view))
7124 				view_get_split(view, &begin_y, &begin_x);
7125 
7126 			diff_view = view_open(0, 0, begin_y, begin_x,
7127 			    TOG_VIEW_DIFF);
7128 			if (diff_view == NULL) {
7129 				got_object_commit_close(commit);
7130 				err = got_error_from_errno("view_open");
7131 				break;
7132 			}
7133 		}
7134 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7135 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7136 		got_object_commit_close(commit);
7137 		if (err)
7138 			break;
7139 		s->last_diffed_line = s->first_displayed_line - 1 +
7140 		    s->selected_line;
7141 		if (*new_view)
7142 			break;	/* still open from active diff view */
7143 		if (view_is_parent_view(view) &&
7144 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7145 			err = view_init_hsplit(view, begin_y);
7146 			if (err)
7147 				break;
7148 		}
7149 
7150 		view->focussed = 0;
7151 		diff_view->focussed = 1;
7152 		diff_view->mode = view->mode;
7153 		diff_view->nlines = view->lines - begin_y;
7154 		if (view_is_parent_view(view)) {
7155 			view_transfer_size(diff_view, view);
7156 			err = view_close_child(view);
7157 			if (err)
7158 				break;
7159 			err = view_set_child(view, diff_view);
7160 			if (err)
7161 				break;
7162 			view->focus_child = 1;
7163 		} else
7164 			*new_view = diff_view;
7165 		if (err)
7166 			break;
7167 		break;
7168 	}
7169 	case CTRL('d'):
7170 	case 'd':
7171 		nscroll /= 2;
7172 		/* FALL THROUGH */
7173 	case KEY_NPAGE:
7174 	case CTRL('f'):
7175 	case 'f':
7176 	case ' ':
7177 		if (s->last_displayed_line >= s->blame.nlines &&
7178 		    s->selected_line >= MIN(s->blame.nlines,
7179 		    view->nlines - 2)) {
7180 			view->count = 0;
7181 			break;
7182 		}
7183 		if (s->last_displayed_line >= s->blame.nlines &&
7184 		    s->selected_line < view->nlines - 2) {
7185 			s->selected_line +=
7186 			    MIN(nscroll, s->last_displayed_line -
7187 			    s->first_displayed_line - s->selected_line + 1);
7188 		}
7189 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7190 			s->first_displayed_line += nscroll;
7191 		else
7192 			s->first_displayed_line =
7193 			    s->blame.nlines - (view->nlines - 3);
7194 		break;
7195 	case KEY_RESIZE:
7196 		if (s->selected_line > view->nlines - 2) {
7197 			s->selected_line = MIN(s->blame.nlines,
7198 			    view->nlines - 2);
7199 		}
7200 		break;
7201 	default:
7202 		view->count = 0;
7203 		break;
7204 	}
7205 	return thread_err ? thread_err : err;
7206 }
7207 
7208 static const struct got_error *
7209 reset_blame_view(struct tog_view *view)
7210 {
7211 	const struct got_error *err;
7212 	struct tog_blame_view_state *s = &view->state.blame;
7213 
7214 	view->count = 0;
7215 	s->done = 1;
7216 	err = stop_blame(&s->blame);
7217 	s->done = 0;
7218 	if (err)
7219 		return err;
7220 	return run_blame(view);
7221 }
7222 
7223 static const struct got_error *
7224 cmd_blame(int argc, char *argv[])
7225 {
7226 	const struct got_error *error;
7227 	struct got_repository *repo = NULL;
7228 	struct got_worktree *worktree = NULL;
7229 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7230 	char *link_target = NULL;
7231 	struct got_object_id *commit_id = NULL;
7232 	struct got_commit_object *commit = NULL;
7233 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7234 	int ch;
7235 	struct tog_view *view = NULL;
7236 	int *pack_fds = NULL;
7237 
7238 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7239 		switch (ch) {
7240 		case 'c':
7241 			commit_id_str = optarg;
7242 			break;
7243 		case 'r':
7244 			repo_path = realpath(optarg, NULL);
7245 			if (repo_path == NULL)
7246 				return got_error_from_errno2("realpath",
7247 				    optarg);
7248 			break;
7249 		default:
7250 			usage_blame();
7251 			/* NOTREACHED */
7252 		}
7253 	}
7254 
7255 	argc -= optind;
7256 	argv += optind;
7257 
7258 	if (argc != 1)
7259 		usage_blame();
7260 
7261 	error = got_repo_pack_fds_open(&pack_fds);
7262 	if (error != NULL)
7263 		goto done;
7264 
7265 	if (repo_path == NULL) {
7266 		cwd = getcwd(NULL, 0);
7267 		if (cwd == NULL)
7268 			return got_error_from_errno("getcwd");
7269 		error = got_worktree_open(&worktree, cwd, NULL);
7270 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7271 			goto done;
7272 		if (worktree)
7273 			repo_path =
7274 			    strdup(got_worktree_get_repo_path(worktree));
7275 		else
7276 			repo_path = strdup(cwd);
7277 		if (repo_path == NULL) {
7278 			error = got_error_from_errno("strdup");
7279 			goto done;
7280 		}
7281 	}
7282 
7283 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7284 	if (error != NULL)
7285 		goto done;
7286 
7287 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7288 	    worktree);
7289 	if (error)
7290 		goto done;
7291 
7292 	init_curses();
7293 
7294 	error = apply_unveil(got_repo_get_path(repo), NULL);
7295 	if (error)
7296 		goto done;
7297 
7298 	error = tog_load_refs(repo, 0);
7299 	if (error)
7300 		goto done;
7301 
7302 	if (commit_id_str == NULL) {
7303 		struct got_reference *head_ref;
7304 		error = got_ref_open(&head_ref, repo, worktree ?
7305 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7306 		if (error != NULL)
7307 			goto done;
7308 		error = got_ref_resolve(&commit_id, repo, head_ref);
7309 		got_ref_close(head_ref);
7310 	} else {
7311 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7312 		    repo, worktree);
7313 		if (error != NULL)
7314 			goto done;
7315 		if (keyword_idstr != NULL)
7316 			commit_id_str = keyword_idstr;
7317 
7318 		error = got_repo_match_object_id(&commit_id, NULL,
7319 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7320 	}
7321 	if (error != NULL)
7322 		goto done;
7323 
7324 	error = got_object_open_as_commit(&commit, repo, commit_id);
7325 	if (error)
7326 		goto done;
7327 
7328 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7329 	    commit, repo);
7330 	if (error)
7331 		goto done;
7332 
7333 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7334 	if (view == NULL) {
7335 		error = got_error_from_errno("view_open");
7336 		goto done;
7337 	}
7338 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7339 	    commit_id, repo);
7340 	if (error != NULL) {
7341 		if (view->close == NULL)
7342 			close_blame_view(view);
7343 		view_close(view);
7344 		goto done;
7345 	}
7346 
7347 	if (worktree) {
7348 		error = set_tog_base_commit(repo, worktree);
7349 		if (error != NULL)
7350 			goto done;
7351 
7352 		/* Release work tree lock. */
7353 		got_worktree_close(worktree);
7354 		worktree = NULL;
7355 	}
7356 
7357 	error = view_loop(view);
7358 
7359 done:
7360 	free(tog_base_commit.id);
7361 	free(repo_path);
7362 	free(in_repo_path);
7363 	free(link_target);
7364 	free(cwd);
7365 	free(commit_id);
7366 	free(keyword_idstr);
7367 	if (commit)
7368 		got_object_commit_close(commit);
7369 	if (worktree)
7370 		got_worktree_close(worktree);
7371 	if (repo) {
7372 		const struct got_error *close_err = got_repo_close(repo);
7373 		if (error == NULL)
7374 			error = close_err;
7375 	}
7376 	if (pack_fds) {
7377 		const struct got_error *pack_err =
7378 		    got_repo_pack_fds_close(pack_fds);
7379 		if (error == NULL)
7380 			error = pack_err;
7381 	}
7382 	tog_free_refs();
7383 	return error;
7384 }
7385 
7386 static const struct got_error *
7387 draw_tree_entries(struct tog_view *view, const char *parent_path)
7388 {
7389 	struct tog_tree_view_state *s = &view->state.tree;
7390 	const struct got_error *err = NULL;
7391 	struct got_tree_entry *te;
7392 	wchar_t *wline;
7393 	char *index = NULL;
7394 	struct tog_color *tc;
7395 	int width, n, nentries, scrollx, i = 1;
7396 	int limit = view->nlines;
7397 
7398 	s->ndisplayed = 0;
7399 	if (view_is_hsplit_top(view))
7400 		--limit;  /* border */
7401 
7402 	werase(view->window);
7403 
7404 	if (limit == 0)
7405 		return NULL;
7406 
7407 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7408 	    0, 0);
7409 	if (err)
7410 		return err;
7411 	if (view_needs_focus_indication(view))
7412 		wstandout(view->window);
7413 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7414 	if (tc)
7415 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7416 	waddwstr(view->window, wline);
7417 	free(wline);
7418 	wline = NULL;
7419 	while (width++ < view->ncols)
7420 		waddch(view->window, ' ');
7421 	if (tc)
7422 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7423 	if (view_needs_focus_indication(view))
7424 		wstandend(view->window);
7425 	if (--limit <= 0)
7426 		return NULL;
7427 
7428 	i += s->selected;
7429 	if (s->first_displayed_entry) {
7430 		i += got_tree_entry_get_index(s->first_displayed_entry);
7431 		if (s->tree != s->root)
7432 			++i;  /* account for ".." entry */
7433 	}
7434 	nentries = got_object_tree_get_nentries(s->tree);
7435 	if (asprintf(&index, "[%d/%d] %s",
7436 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7437 		return got_error_from_errno("asprintf");
7438 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7439 	free(index);
7440 	if (err)
7441 		return err;
7442 	waddwstr(view->window, wline);
7443 	free(wline);
7444 	wline = NULL;
7445 	if (width < view->ncols - 1)
7446 		waddch(view->window, '\n');
7447 	if (--limit <= 0)
7448 		return NULL;
7449 	waddch(view->window, '\n');
7450 	if (--limit <= 0)
7451 		return NULL;
7452 
7453 	if (s->first_displayed_entry == NULL) {
7454 		te = got_object_tree_get_first_entry(s->tree);
7455 		if (s->selected == 0) {
7456 			if (view->focussed)
7457 				wstandout(view->window);
7458 			s->selected_entry = NULL;
7459 		}
7460 		waddstr(view->window, "  ..\n");	/* parent directory */
7461 		if (s->selected == 0 && view->focussed)
7462 			wstandend(view->window);
7463 		s->ndisplayed++;
7464 		if (--limit <= 0)
7465 			return NULL;
7466 		n = 1;
7467 	} else {
7468 		n = 0;
7469 		te = s->first_displayed_entry;
7470 	}
7471 
7472 	view->maxx = 0;
7473 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7474 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7475 		const char *modestr = "";
7476 		mode_t mode;
7477 
7478 		te = got_object_tree_get_entry(s->tree, i);
7479 		mode = got_tree_entry_get_mode(te);
7480 
7481 		if (s->show_ids) {
7482 			err = got_object_id_str(&id_str,
7483 			    got_tree_entry_get_id(te));
7484 			if (err)
7485 				return got_error_from_errno(
7486 				    "got_object_id_str");
7487 		}
7488 		if (got_object_tree_entry_is_submodule(te))
7489 			modestr = "$";
7490 		else if (S_ISLNK(mode)) {
7491 			int i;
7492 
7493 			err = got_tree_entry_get_symlink_target(&link_target,
7494 			    te, s->repo);
7495 			if (err) {
7496 				free(id_str);
7497 				return err;
7498 			}
7499 			for (i = 0; link_target[i] != '\0'; i++) {
7500 				if (!isprint((unsigned char)link_target[i]))
7501 					link_target[i] = '?';
7502 			}
7503 			modestr = "@";
7504 		}
7505 		else if (S_ISDIR(mode))
7506 			modestr = "/";
7507 		else if (mode & S_IXUSR)
7508 			modestr = "*";
7509 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7510 		    got_tree_entry_get_name(te), modestr,
7511 		    link_target ? " -> ": "",
7512 		    link_target ? link_target : "") == -1) {
7513 			free(id_str);
7514 			free(link_target);
7515 			return got_error_from_errno("asprintf");
7516 		}
7517 		free(id_str);
7518 		free(link_target);
7519 
7520 		/* use full line width to determine view->maxx */
7521 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7522 		if (err) {
7523 			free(line);
7524 			break;
7525 		}
7526 		view->maxx = MAX(view->maxx, width);
7527 		free(wline);
7528 		wline = NULL;
7529 
7530 		err = format_line(&wline, &width, &scrollx, line, view->x,
7531 		    view->ncols, 0, 0);
7532 		if (err) {
7533 			free(line);
7534 			break;
7535 		}
7536 		if (n == s->selected) {
7537 			if (view->focussed)
7538 				wstandout(view->window);
7539 			s->selected_entry = te;
7540 		}
7541 		tc = match_color(&s->colors, line);
7542 		if (tc)
7543 			wattr_on(view->window,
7544 			    COLOR_PAIR(tc->colorpair), NULL);
7545 		waddwstr(view->window, &wline[scrollx]);
7546 		if (tc)
7547 			wattr_off(view->window,
7548 			    COLOR_PAIR(tc->colorpair), NULL);
7549 		if (width < view->ncols)
7550 			waddch(view->window, '\n');
7551 		if (n == s->selected && view->focussed)
7552 			wstandend(view->window);
7553 		free(line);
7554 		free(wline);
7555 		wline = NULL;
7556 		n++;
7557 		s->ndisplayed++;
7558 		s->last_displayed_entry = te;
7559 		if (--limit <= 0)
7560 			break;
7561 	}
7562 
7563 	return err;
7564 }
7565 
7566 static void
7567 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7568 {
7569 	struct got_tree_entry *te;
7570 	int isroot = s->tree == s->root;
7571 	int i = 0;
7572 
7573 	if (s->first_displayed_entry == NULL)
7574 		return;
7575 
7576 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7577 	while (i++ < maxscroll) {
7578 		if (te == NULL) {
7579 			if (!isroot)
7580 				s->first_displayed_entry = NULL;
7581 			break;
7582 		}
7583 		s->first_displayed_entry = te;
7584 		te = got_tree_entry_get_prev(s->tree, te);
7585 	}
7586 }
7587 
7588 static const struct got_error *
7589 tree_scroll_down(struct tog_view *view, int maxscroll)
7590 {
7591 	struct tog_tree_view_state *s = &view->state.tree;
7592 	struct got_tree_entry *next, *last;
7593 	int n = 0;
7594 
7595 	if (s->first_displayed_entry)
7596 		next = got_tree_entry_get_next(s->tree,
7597 		    s->first_displayed_entry);
7598 	else
7599 		next = got_object_tree_get_first_entry(s->tree);
7600 
7601 	last = s->last_displayed_entry;
7602 	while (next && n++ < maxscroll) {
7603 		if (last) {
7604 			s->last_displayed_entry = last;
7605 			last = got_tree_entry_get_next(s->tree, last);
7606 		}
7607 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7608 			s->first_displayed_entry = next;
7609 			next = got_tree_entry_get_next(s->tree, next);
7610 		}
7611 	}
7612 
7613 	return NULL;
7614 }
7615 
7616 static const struct got_error *
7617 tree_entry_path(char **path, struct tog_parent_trees *parents,
7618     struct got_tree_entry *te)
7619 {
7620 	const struct got_error *err = NULL;
7621 	struct tog_parent_tree *pt;
7622 	size_t len = 2; /* for leading slash and NUL */
7623 
7624 	TAILQ_FOREACH(pt, parents, entry)
7625 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7626 		    + 1 /* slash */;
7627 	if (te)
7628 		len += strlen(got_tree_entry_get_name(te));
7629 
7630 	*path = calloc(1, len);
7631 	if (path == NULL)
7632 		return got_error_from_errno("calloc");
7633 
7634 	(*path)[0] = '/';
7635 	pt = TAILQ_LAST(parents, tog_parent_trees);
7636 	while (pt) {
7637 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7638 		if (strlcat(*path, name, len) >= len) {
7639 			err = got_error(GOT_ERR_NO_SPACE);
7640 			goto done;
7641 		}
7642 		if (strlcat(*path, "/", len) >= len) {
7643 			err = got_error(GOT_ERR_NO_SPACE);
7644 			goto done;
7645 		}
7646 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7647 	}
7648 	if (te) {
7649 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7650 			err = got_error(GOT_ERR_NO_SPACE);
7651 			goto done;
7652 		}
7653 	}
7654 done:
7655 	if (err) {
7656 		free(*path);
7657 		*path = NULL;
7658 	}
7659 	return err;
7660 }
7661 
7662 static const struct got_error *
7663 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7664     struct got_tree_entry *te, struct tog_parent_trees *parents,
7665     struct got_object_id *commit_id, struct got_repository *repo)
7666 {
7667 	const struct got_error *err = NULL;
7668 	char *path;
7669 	struct tog_view *blame_view;
7670 
7671 	*new_view = NULL;
7672 
7673 	err = tree_entry_path(&path, parents, te);
7674 	if (err)
7675 		return err;
7676 
7677 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7678 	if (blame_view == NULL) {
7679 		err = got_error_from_errno("view_open");
7680 		goto done;
7681 	}
7682 
7683 	err = open_blame_view(blame_view, path, commit_id, repo);
7684 	if (err) {
7685 		if (err->code == GOT_ERR_CANCELLED)
7686 			err = NULL;
7687 		view_close(blame_view);
7688 	} else
7689 		*new_view = blame_view;
7690 done:
7691 	free(path);
7692 	return err;
7693 }
7694 
7695 static const struct got_error *
7696 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7697     struct tog_tree_view_state *s)
7698 {
7699 	struct tog_view *log_view;
7700 	const struct got_error *err = NULL;
7701 	char *path;
7702 
7703 	*new_view = NULL;
7704 
7705 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7706 	if (log_view == NULL)
7707 		return got_error_from_errno("view_open");
7708 
7709 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7710 	if (err)
7711 		return err;
7712 
7713 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7714 	    path, 0, NULL);
7715 	if (err)
7716 		view_close(log_view);
7717 	else
7718 		*new_view = log_view;
7719 	free(path);
7720 	return err;
7721 }
7722 
7723 static const struct got_error *
7724 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7725     const char *head_ref_name, struct got_repository *repo)
7726 {
7727 	const struct got_error *err = NULL;
7728 	char *commit_id_str = NULL;
7729 	struct tog_tree_view_state *s = &view->state.tree;
7730 	struct got_commit_object *commit = NULL;
7731 
7732 	TAILQ_INIT(&s->parents);
7733 	STAILQ_INIT(&s->colors);
7734 
7735 	s->commit_id = got_object_id_dup(commit_id);
7736 	if (s->commit_id == NULL) {
7737 		err = got_error_from_errno("got_object_id_dup");
7738 		goto done;
7739 	}
7740 
7741 	err = got_object_open_as_commit(&commit, repo, commit_id);
7742 	if (err)
7743 		goto done;
7744 
7745 	/*
7746 	 * The root is opened here and will be closed when the view is closed.
7747 	 * Any visited subtrees and their path-wise parents are opened and
7748 	 * closed on demand.
7749 	 */
7750 	err = got_object_open_as_tree(&s->root, repo,
7751 	    got_object_commit_get_tree_id(commit));
7752 	if (err)
7753 		goto done;
7754 	s->tree = s->root;
7755 
7756 	err = got_object_id_str(&commit_id_str, commit_id);
7757 	if (err != NULL)
7758 		goto done;
7759 
7760 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7761 		err = got_error_from_errno("asprintf");
7762 		goto done;
7763 	}
7764 
7765 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7766 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7767 	if (head_ref_name) {
7768 		s->head_ref_name = strdup(head_ref_name);
7769 		if (s->head_ref_name == NULL) {
7770 			err = got_error_from_errno("strdup");
7771 			goto done;
7772 		}
7773 	}
7774 	s->repo = repo;
7775 
7776 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7777 		err = add_color(&s->colors, "\\$$",
7778 		    TOG_COLOR_TREE_SUBMODULE,
7779 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7780 		if (err)
7781 			goto done;
7782 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7783 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7784 		if (err)
7785 			goto done;
7786 		err = add_color(&s->colors, "/$",
7787 		    TOG_COLOR_TREE_DIRECTORY,
7788 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7789 		if (err)
7790 			goto done;
7791 
7792 		err = add_color(&s->colors, "\\*$",
7793 		    TOG_COLOR_TREE_EXECUTABLE,
7794 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7795 		if (err)
7796 			goto done;
7797 
7798 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7799 		    get_color_value("TOG_COLOR_COMMIT"));
7800 		if (err)
7801 			goto done;
7802 	}
7803 
7804 	view->show = show_tree_view;
7805 	view->input = input_tree_view;
7806 	view->close = close_tree_view;
7807 	view->search_start = search_start_tree_view;
7808 	view->search_next = search_next_tree_view;
7809 done:
7810 	free(commit_id_str);
7811 	if (commit)
7812 		got_object_commit_close(commit);
7813 	if (err) {
7814 		if (view->close == NULL)
7815 			close_tree_view(view);
7816 		view_close(view);
7817 	}
7818 	return err;
7819 }
7820 
7821 static const struct got_error *
7822 close_tree_view(struct tog_view *view)
7823 {
7824 	struct tog_tree_view_state *s = &view->state.tree;
7825 
7826 	free_colors(&s->colors);
7827 	free(s->tree_label);
7828 	s->tree_label = NULL;
7829 	free(s->commit_id);
7830 	s->commit_id = NULL;
7831 	free(s->head_ref_name);
7832 	s->head_ref_name = NULL;
7833 	while (!TAILQ_EMPTY(&s->parents)) {
7834 		struct tog_parent_tree *parent;
7835 		parent = TAILQ_FIRST(&s->parents);
7836 		TAILQ_REMOVE(&s->parents, parent, entry);
7837 		if (parent->tree != s->root)
7838 			got_object_tree_close(parent->tree);
7839 		free(parent);
7840 
7841 	}
7842 	if (s->tree != NULL && s->tree != s->root)
7843 		got_object_tree_close(s->tree);
7844 	if (s->root)
7845 		got_object_tree_close(s->root);
7846 	return NULL;
7847 }
7848 
7849 static const struct got_error *
7850 search_start_tree_view(struct tog_view *view)
7851 {
7852 	struct tog_tree_view_state *s = &view->state.tree;
7853 
7854 	s->matched_entry = NULL;
7855 	return NULL;
7856 }
7857 
7858 static int
7859 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7860 {
7861 	regmatch_t regmatch;
7862 
7863 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7864 	    0) == 0;
7865 }
7866 
7867 static const struct got_error *
7868 search_next_tree_view(struct tog_view *view)
7869 {
7870 	struct tog_tree_view_state *s = &view->state.tree;
7871 	struct got_tree_entry *te = NULL;
7872 
7873 	if (!view->searching) {
7874 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7875 		return NULL;
7876 	}
7877 
7878 	if (s->matched_entry) {
7879 		if (view->searching == TOG_SEARCH_FORWARD) {
7880 			if (s->selected_entry)
7881 				te = got_tree_entry_get_next(s->tree,
7882 				    s->selected_entry);
7883 			else
7884 				te = got_object_tree_get_first_entry(s->tree);
7885 		} else {
7886 			if (s->selected_entry == NULL)
7887 				te = got_object_tree_get_last_entry(s->tree);
7888 			else
7889 				te = got_tree_entry_get_prev(s->tree,
7890 				    s->selected_entry);
7891 		}
7892 	} else {
7893 		if (s->selected_entry)
7894 			te = s->selected_entry;
7895 		else if (view->searching == TOG_SEARCH_FORWARD)
7896 			te = got_object_tree_get_first_entry(s->tree);
7897 		else
7898 			te = got_object_tree_get_last_entry(s->tree);
7899 	}
7900 
7901 	while (1) {
7902 		if (te == NULL) {
7903 			if (s->matched_entry == NULL) {
7904 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7905 				return NULL;
7906 			}
7907 			if (view->searching == TOG_SEARCH_FORWARD)
7908 				te = got_object_tree_get_first_entry(s->tree);
7909 			else
7910 				te = got_object_tree_get_last_entry(s->tree);
7911 		}
7912 
7913 		if (match_tree_entry(te, &view->regex)) {
7914 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7915 			s->matched_entry = te;
7916 			break;
7917 		}
7918 
7919 		if (view->searching == TOG_SEARCH_FORWARD)
7920 			te = got_tree_entry_get_next(s->tree, te);
7921 		else
7922 			te = got_tree_entry_get_prev(s->tree, te);
7923 	}
7924 
7925 	if (s->matched_entry) {
7926 		s->first_displayed_entry = s->matched_entry;
7927 		s->selected = 0;
7928 	}
7929 
7930 	return NULL;
7931 }
7932 
7933 static const struct got_error *
7934 show_tree_view(struct tog_view *view)
7935 {
7936 	const struct got_error *err = NULL;
7937 	struct tog_tree_view_state *s = &view->state.tree;
7938 	char *parent_path;
7939 
7940 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7941 	if (err)
7942 		return err;
7943 
7944 	err = draw_tree_entries(view, parent_path);
7945 	free(parent_path);
7946 
7947 	view_border(view);
7948 	return err;
7949 }
7950 
7951 static const struct got_error *
7952 tree_goto_line(struct tog_view *view, int nlines)
7953 {
7954 	const struct got_error		 *err = NULL;
7955 	struct tog_tree_view_state	 *s = &view->state.tree;
7956 	struct got_tree_entry		**fte, **lte, **ste;
7957 	int				  g, last, first = 1, i = 1;
7958 	int				  root = s->tree == s->root;
7959 	int				  off = root ? 1 : 2;
7960 
7961 	g = view->gline;
7962 	view->gline = 0;
7963 
7964 	if (g == 0)
7965 		g = 1;
7966 	else if (g > got_object_tree_get_nentries(s->tree))
7967 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7968 
7969 	fte = &s->first_displayed_entry;
7970 	lte = &s->last_displayed_entry;
7971 	ste = &s->selected_entry;
7972 
7973 	if (*fte != NULL) {
7974 		first = got_tree_entry_get_index(*fte);
7975 		first += off;  /* account for ".." */
7976 	}
7977 	last = got_tree_entry_get_index(*lte);
7978 	last += off;
7979 
7980 	if (g >= first && g <= last && g - first < nlines) {
7981 		s->selected = g - first;
7982 		return NULL;	/* gline is on the current page */
7983 	}
7984 
7985 	if (*ste != NULL) {
7986 		i = got_tree_entry_get_index(*ste);
7987 		i += off;
7988 	}
7989 
7990 	if (i < g) {
7991 		err = tree_scroll_down(view, g - i);
7992 		if (err)
7993 			return err;
7994 		if (got_tree_entry_get_index(*lte) >=
7995 		    got_object_tree_get_nentries(s->tree) - 1 &&
7996 		    first + s->selected < g &&
7997 		    s->selected < s->ndisplayed - 1) {
7998 			first = got_tree_entry_get_index(*fte);
7999 			first += off;
8000 			s->selected = g - first;
8001 		}
8002 	} else if (i > g)
8003 		tree_scroll_up(s, i - g);
8004 
8005 	if (g < nlines &&
8006 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
8007 		s->selected = g - 1;
8008 
8009 	return NULL;
8010 }
8011 
8012 static const struct got_error *
8013 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
8014 {
8015 	const struct got_error *err = NULL;
8016 	struct tog_tree_view_state *s = &view->state.tree;
8017 	struct got_tree_entry *te;
8018 	int n, nscroll = view->nlines - 3;
8019 
8020 	if (view->gline)
8021 		return tree_goto_line(view, nscroll);
8022 
8023 	switch (ch) {
8024 	case '0':
8025 	case '$':
8026 	case KEY_RIGHT:
8027 	case 'l':
8028 	case KEY_LEFT:
8029 	case 'h':
8030 		horizontal_scroll_input(view, ch);
8031 		break;
8032 	case 'i':
8033 		s->show_ids = !s->show_ids;
8034 		view->count = 0;
8035 		break;
8036 	case 'L':
8037 		view->count = 0;
8038 		if (!s->selected_entry)
8039 			break;
8040 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8041 		break;
8042 	case 'R':
8043 		view->count = 0;
8044 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8045 		break;
8046 	case 'g':
8047 	case '=':
8048 	case KEY_HOME:
8049 		s->selected = 0;
8050 		view->count = 0;
8051 		if (s->tree == s->root)
8052 			s->first_displayed_entry =
8053 			    got_object_tree_get_first_entry(s->tree);
8054 		else
8055 			s->first_displayed_entry = NULL;
8056 		break;
8057 	case 'G':
8058 	case '*':
8059 	case KEY_END: {
8060 		int eos = view->nlines - 3;
8061 
8062 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8063 			--eos;  /* border */
8064 		s->selected = 0;
8065 		view->count = 0;
8066 		te = got_object_tree_get_last_entry(s->tree);
8067 		for (n = 0; n < eos; n++) {
8068 			if (te == NULL) {
8069 				if (s->tree != s->root) {
8070 					s->first_displayed_entry = NULL;
8071 					n++;
8072 				}
8073 				break;
8074 			}
8075 			s->first_displayed_entry = te;
8076 			te = got_tree_entry_get_prev(s->tree, te);
8077 		}
8078 		if (n > 0)
8079 			s->selected = n - 1;
8080 		break;
8081 	}
8082 	case 'k':
8083 	case KEY_UP:
8084 	case CTRL('p'):
8085 		if (s->selected > 0) {
8086 			s->selected--;
8087 			break;
8088 		}
8089 		tree_scroll_up(s, 1);
8090 		if (s->selected_entry == NULL ||
8091 		    (s->tree == s->root && s->selected_entry ==
8092 		     got_object_tree_get_first_entry(s->tree)))
8093 			view->count = 0;
8094 		break;
8095 	case CTRL('u'):
8096 	case 'u':
8097 		nscroll /= 2;
8098 		/* FALL THROUGH */
8099 	case KEY_PPAGE:
8100 	case CTRL('b'):
8101 	case 'b':
8102 		if (s->tree == s->root) {
8103 			if (got_object_tree_get_first_entry(s->tree) ==
8104 			    s->first_displayed_entry)
8105 				s->selected -= MIN(s->selected, nscroll);
8106 		} else {
8107 			if (s->first_displayed_entry == NULL)
8108 				s->selected -= MIN(s->selected, nscroll);
8109 		}
8110 		tree_scroll_up(s, MAX(0, nscroll));
8111 		if (s->selected_entry == NULL ||
8112 		    (s->tree == s->root && s->selected_entry ==
8113 		     got_object_tree_get_first_entry(s->tree)))
8114 			view->count = 0;
8115 		break;
8116 	case 'j':
8117 	case KEY_DOWN:
8118 	case CTRL('n'):
8119 		if (s->selected < s->ndisplayed - 1) {
8120 			s->selected++;
8121 			break;
8122 		}
8123 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8124 		    == NULL) {
8125 			/* can't scroll any further */
8126 			view->count = 0;
8127 			break;
8128 		}
8129 		tree_scroll_down(view, 1);
8130 		break;
8131 	case CTRL('d'):
8132 	case 'd':
8133 		nscroll /= 2;
8134 		/* FALL THROUGH */
8135 	case KEY_NPAGE:
8136 	case CTRL('f'):
8137 	case 'f':
8138 	case ' ':
8139 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8140 		    == NULL) {
8141 			/* can't scroll any further; move cursor down */
8142 			if (s->selected < s->ndisplayed - 1)
8143 				s->selected += MIN(nscroll,
8144 				    s->ndisplayed - s->selected - 1);
8145 			else
8146 				view->count = 0;
8147 			break;
8148 		}
8149 		tree_scroll_down(view, nscroll);
8150 		break;
8151 	case KEY_ENTER:
8152 	case '\r':
8153 	case KEY_BACKSPACE:
8154 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8155 			struct tog_parent_tree *parent;
8156 			/* user selected '..' */
8157 			if (s->tree == s->root) {
8158 				view->count = 0;
8159 				break;
8160 			}
8161 			parent = TAILQ_FIRST(&s->parents);
8162 			TAILQ_REMOVE(&s->parents, parent,
8163 			    entry);
8164 			got_object_tree_close(s->tree);
8165 			s->tree = parent->tree;
8166 			s->first_displayed_entry =
8167 			    parent->first_displayed_entry;
8168 			s->selected_entry =
8169 			    parent->selected_entry;
8170 			s->selected = parent->selected;
8171 			if (s->selected > view->nlines - 3) {
8172 				err = offset_selection_down(view);
8173 				if (err)
8174 					break;
8175 			}
8176 			free(parent);
8177 		} else if (S_ISDIR(got_tree_entry_get_mode(
8178 		    s->selected_entry))) {
8179 			struct got_tree_object *subtree;
8180 			view->count = 0;
8181 			err = got_object_open_as_tree(&subtree, s->repo,
8182 			    got_tree_entry_get_id(s->selected_entry));
8183 			if (err)
8184 				break;
8185 			err = tree_view_visit_subtree(s, subtree);
8186 			if (err) {
8187 				got_object_tree_close(subtree);
8188 				break;
8189 			}
8190 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8191 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8192 		break;
8193 	case KEY_RESIZE:
8194 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8195 			s->selected = view->nlines - 4;
8196 		view->count = 0;
8197 		break;
8198 	default:
8199 		view->count = 0;
8200 		break;
8201 	}
8202 
8203 	return err;
8204 }
8205 
8206 __dead static void
8207 usage_tree(void)
8208 {
8209 	endwin();
8210 	fprintf(stderr,
8211 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8212 	    getprogname());
8213 	exit(1);
8214 }
8215 
8216 static const struct got_error *
8217 cmd_tree(int argc, char *argv[])
8218 {
8219 	const struct got_error *error;
8220 	struct got_repository *repo = NULL;
8221 	struct got_worktree *worktree = NULL;
8222 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8223 	struct got_object_id *commit_id = NULL;
8224 	struct got_commit_object *commit = NULL;
8225 	const char *commit_id_arg = NULL;
8226 	char *keyword_idstr = NULL, *label = NULL;
8227 	struct got_reference *ref = NULL;
8228 	const char *head_ref_name = NULL;
8229 	int ch;
8230 	struct tog_view *view;
8231 	int *pack_fds = NULL;
8232 
8233 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8234 		switch (ch) {
8235 		case 'c':
8236 			commit_id_arg = optarg;
8237 			break;
8238 		case 'r':
8239 			repo_path = realpath(optarg, NULL);
8240 			if (repo_path == NULL)
8241 				return got_error_from_errno2("realpath",
8242 				    optarg);
8243 			break;
8244 		default:
8245 			usage_tree();
8246 			/* NOTREACHED */
8247 		}
8248 	}
8249 
8250 	argc -= optind;
8251 	argv += optind;
8252 
8253 	if (argc > 1)
8254 		usage_tree();
8255 
8256 	error = got_repo_pack_fds_open(&pack_fds);
8257 	if (error != NULL)
8258 		goto done;
8259 
8260 	if (repo_path == NULL) {
8261 		cwd = getcwd(NULL, 0);
8262 		if (cwd == NULL)
8263 			return got_error_from_errno("getcwd");
8264 		error = got_worktree_open(&worktree, cwd, NULL);
8265 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8266 			goto done;
8267 		if (worktree)
8268 			repo_path =
8269 			    strdup(got_worktree_get_repo_path(worktree));
8270 		else
8271 			repo_path = strdup(cwd);
8272 		if (repo_path == NULL) {
8273 			error = got_error_from_errno("strdup");
8274 			goto done;
8275 		}
8276 	}
8277 
8278 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8279 	if (error != NULL)
8280 		goto done;
8281 
8282 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8283 	    repo, worktree);
8284 	if (error)
8285 		goto done;
8286 
8287 	init_curses();
8288 
8289 	error = apply_unveil(got_repo_get_path(repo), NULL);
8290 	if (error)
8291 		goto done;
8292 
8293 	error = tog_load_refs(repo, 0);
8294 	if (error)
8295 		goto done;
8296 
8297 	if (commit_id_arg == NULL) {
8298 		error = got_repo_match_object_id(&commit_id, &label,
8299 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8300 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8301 		if (error)
8302 			goto done;
8303 		head_ref_name = label;
8304 	} else {
8305 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8306 		    repo, worktree);
8307 		if (error != NULL)
8308 			goto done;
8309 		if (keyword_idstr != NULL)
8310 			commit_id_arg = keyword_idstr;
8311 
8312 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8313 		if (error == NULL)
8314 			head_ref_name = got_ref_get_name(ref);
8315 		else if (error->code != GOT_ERR_NOT_REF)
8316 			goto done;
8317 		error = got_repo_match_object_id(&commit_id, NULL,
8318 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8319 		if (error)
8320 			goto done;
8321 	}
8322 
8323 	error = got_object_open_as_commit(&commit, repo, commit_id);
8324 	if (error)
8325 		goto done;
8326 
8327 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8328 	if (view == NULL) {
8329 		error = got_error_from_errno("view_open");
8330 		goto done;
8331 	}
8332 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8333 	if (error)
8334 		goto done;
8335 	if (!got_path_is_root_dir(in_repo_path)) {
8336 		error = tree_view_walk_path(&view->state.tree, commit,
8337 		    in_repo_path);
8338 		if (error)
8339 			goto done;
8340 	}
8341 
8342 	if (worktree) {
8343 		error = set_tog_base_commit(repo, worktree);
8344 		if (error != NULL)
8345 			goto done;
8346 
8347 		/* Release work tree lock. */
8348 		got_worktree_close(worktree);
8349 		worktree = NULL;
8350 	}
8351 
8352 	error = view_loop(view);
8353 
8354 done:
8355 	free(tog_base_commit.id);
8356 	free(keyword_idstr);
8357 	free(repo_path);
8358 	free(cwd);
8359 	free(commit_id);
8360 	free(label);
8361 	if (ref)
8362 		got_ref_close(ref);
8363 	if (worktree != NULL)
8364 		got_worktree_close(worktree);
8365 	if (repo) {
8366 		const struct got_error *close_err = got_repo_close(repo);
8367 		if (error == NULL)
8368 			error = close_err;
8369 	}
8370 	if (pack_fds) {
8371 		const struct got_error *pack_err =
8372 		    got_repo_pack_fds_close(pack_fds);
8373 		if (error == NULL)
8374 			error = pack_err;
8375 	}
8376 	tog_free_refs();
8377 	return error;
8378 }
8379 
8380 static const struct got_error *
8381 ref_view_load_refs(struct tog_ref_view_state *s)
8382 {
8383 	struct got_reflist_entry *sre;
8384 	struct tog_reflist_entry *re;
8385 
8386 	s->nrefs = 0;
8387 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8388 		if (strncmp(got_ref_get_name(sre->ref),
8389 		    "refs/got/", 9) == 0 &&
8390 		    strncmp(got_ref_get_name(sre->ref),
8391 		    "refs/got/backup/", 16) != 0)
8392 			continue;
8393 
8394 		re = malloc(sizeof(*re));
8395 		if (re == NULL)
8396 			return got_error_from_errno("malloc");
8397 
8398 		re->ref = got_ref_dup(sre->ref);
8399 		if (re->ref == NULL)
8400 			return got_error_from_errno("got_ref_dup");
8401 		re->idx = s->nrefs++;
8402 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8403 	}
8404 
8405 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8406 	return NULL;
8407 }
8408 
8409 static void
8410 ref_view_free_refs(struct tog_ref_view_state *s)
8411 {
8412 	struct tog_reflist_entry *re;
8413 
8414 	while (!TAILQ_EMPTY(&s->refs)) {
8415 		re = TAILQ_FIRST(&s->refs);
8416 		TAILQ_REMOVE(&s->refs, re, entry);
8417 		got_ref_close(re->ref);
8418 		free(re);
8419 	}
8420 }
8421 
8422 static const struct got_error *
8423 open_ref_view(struct tog_view *view, struct got_repository *repo)
8424 {
8425 	const struct got_error *err = NULL;
8426 	struct tog_ref_view_state *s = &view->state.ref;
8427 
8428 	s->selected_entry = 0;
8429 	s->repo = repo;
8430 
8431 	TAILQ_INIT(&s->refs);
8432 	STAILQ_INIT(&s->colors);
8433 
8434 	err = ref_view_load_refs(s);
8435 	if (err)
8436 		goto done;
8437 
8438 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8439 		err = add_color(&s->colors, "^refs/heads/",
8440 		    TOG_COLOR_REFS_HEADS,
8441 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8442 		if (err)
8443 			goto done;
8444 
8445 		err = add_color(&s->colors, "^refs/tags/",
8446 		    TOG_COLOR_REFS_TAGS,
8447 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8448 		if (err)
8449 			goto done;
8450 
8451 		err = add_color(&s->colors, "^refs/remotes/",
8452 		    TOG_COLOR_REFS_REMOTES,
8453 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8454 		if (err)
8455 			goto done;
8456 
8457 		err = add_color(&s->colors, "^refs/got/backup/",
8458 		    TOG_COLOR_REFS_BACKUP,
8459 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8460 		if (err)
8461 			goto done;
8462 	}
8463 
8464 	view->show = show_ref_view;
8465 	view->input = input_ref_view;
8466 	view->close = close_ref_view;
8467 	view->search_start = search_start_ref_view;
8468 	view->search_next = search_next_ref_view;
8469 done:
8470 	if (err) {
8471 		if (view->close == NULL)
8472 			close_ref_view(view);
8473 		view_close(view);
8474 	}
8475 	return err;
8476 }
8477 
8478 static const struct got_error *
8479 close_ref_view(struct tog_view *view)
8480 {
8481 	struct tog_ref_view_state *s = &view->state.ref;
8482 
8483 	ref_view_free_refs(s);
8484 	free_colors(&s->colors);
8485 
8486 	return NULL;
8487 }
8488 
8489 static const struct got_error *
8490 resolve_reflist_entry(struct got_object_id **commit_id,
8491     struct tog_reflist_entry *re, struct got_repository *repo)
8492 {
8493 	const struct got_error *err = NULL;
8494 	struct got_object_id *obj_id;
8495 	struct got_tag_object *tag = NULL;
8496 	int obj_type;
8497 
8498 	*commit_id = NULL;
8499 
8500 	err = got_ref_resolve(&obj_id, repo, re->ref);
8501 	if (err)
8502 		return err;
8503 
8504 	err = got_object_get_type(&obj_type, repo, obj_id);
8505 	if (err)
8506 		goto done;
8507 
8508 	switch (obj_type) {
8509 	case GOT_OBJ_TYPE_COMMIT:
8510 		*commit_id = obj_id;
8511 		break;
8512 	case GOT_OBJ_TYPE_TAG:
8513 		err = got_object_open_as_tag(&tag, repo, obj_id);
8514 		if (err)
8515 			goto done;
8516 		free(obj_id);
8517 		err = got_object_get_type(&obj_type, repo,
8518 		    got_object_tag_get_object_id(tag));
8519 		if (err)
8520 			goto done;
8521 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8522 			err = got_error(GOT_ERR_OBJ_TYPE);
8523 			goto done;
8524 		}
8525 		*commit_id = got_object_id_dup(
8526 		    got_object_tag_get_object_id(tag));
8527 		if (*commit_id == NULL) {
8528 			err = got_error_from_errno("got_object_id_dup");
8529 			goto done;
8530 		}
8531 		break;
8532 	default:
8533 		err = got_error(GOT_ERR_OBJ_TYPE);
8534 		break;
8535 	}
8536 
8537 done:
8538 	if (tag)
8539 		got_object_tag_close(tag);
8540 	if (err) {
8541 		free(*commit_id);
8542 		*commit_id = NULL;
8543 	}
8544 	return err;
8545 }
8546 
8547 static const struct got_error *
8548 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8549     struct tog_reflist_entry *re, struct got_repository *repo)
8550 {
8551 	struct tog_view *log_view;
8552 	const struct got_error *err = NULL;
8553 	struct got_object_id *commit_id = NULL;
8554 
8555 	*new_view = NULL;
8556 
8557 	err = resolve_reflist_entry(&commit_id, re, repo);
8558 	if (err) {
8559 		if (err->code != GOT_ERR_OBJ_TYPE)
8560 			return err;
8561 		else
8562 			return NULL;
8563 	}
8564 
8565 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8566 	if (log_view == NULL) {
8567 		err = got_error_from_errno("view_open");
8568 		goto done;
8569 	}
8570 
8571 	err = open_log_view(log_view, commit_id, repo,
8572 	    got_ref_get_name(re->ref), "", 0, NULL);
8573 done:
8574 	if (err)
8575 		view_close(log_view);
8576 	else
8577 		*new_view = log_view;
8578 	free(commit_id);
8579 	return err;
8580 }
8581 
8582 static void
8583 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8584 {
8585 	struct tog_reflist_entry *re;
8586 	int i = 0;
8587 
8588 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8589 		return;
8590 
8591 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8592 	while (i++ < maxscroll) {
8593 		if (re == NULL)
8594 			break;
8595 		s->first_displayed_entry = re;
8596 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8597 	}
8598 }
8599 
8600 static const struct got_error *
8601 ref_scroll_down(struct tog_view *view, int maxscroll)
8602 {
8603 	struct tog_ref_view_state *s = &view->state.ref;
8604 	struct tog_reflist_entry *next, *last;
8605 	int n = 0;
8606 
8607 	if (s->first_displayed_entry)
8608 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8609 	else
8610 		next = TAILQ_FIRST(&s->refs);
8611 
8612 	last = s->last_displayed_entry;
8613 	while (next && n++ < maxscroll) {
8614 		if (last) {
8615 			s->last_displayed_entry = last;
8616 			last = TAILQ_NEXT(last, entry);
8617 		}
8618 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8619 			s->first_displayed_entry = next;
8620 			next = TAILQ_NEXT(next, entry);
8621 		}
8622 	}
8623 
8624 	return NULL;
8625 }
8626 
8627 static const struct got_error *
8628 search_start_ref_view(struct tog_view *view)
8629 {
8630 	struct tog_ref_view_state *s = &view->state.ref;
8631 
8632 	s->matched_entry = NULL;
8633 	return NULL;
8634 }
8635 
8636 static int
8637 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8638 {
8639 	regmatch_t regmatch;
8640 
8641 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8642 	    0) == 0;
8643 }
8644 
8645 static const struct got_error *
8646 search_next_ref_view(struct tog_view *view)
8647 {
8648 	struct tog_ref_view_state *s = &view->state.ref;
8649 	struct tog_reflist_entry *re = NULL;
8650 
8651 	if (!view->searching) {
8652 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8653 		return NULL;
8654 	}
8655 
8656 	if (s->matched_entry) {
8657 		if (view->searching == TOG_SEARCH_FORWARD) {
8658 			if (s->selected_entry)
8659 				re = TAILQ_NEXT(s->selected_entry, entry);
8660 			else
8661 				re = TAILQ_PREV(s->selected_entry,
8662 				    tog_reflist_head, entry);
8663 		} else {
8664 			if (s->selected_entry == NULL)
8665 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8666 			else
8667 				re = TAILQ_PREV(s->selected_entry,
8668 				    tog_reflist_head, entry);
8669 		}
8670 	} else {
8671 		if (s->selected_entry)
8672 			re = s->selected_entry;
8673 		else if (view->searching == TOG_SEARCH_FORWARD)
8674 			re = TAILQ_FIRST(&s->refs);
8675 		else
8676 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8677 	}
8678 
8679 	while (1) {
8680 		if (re == NULL) {
8681 			if (s->matched_entry == NULL) {
8682 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8683 				return NULL;
8684 			}
8685 			if (view->searching == TOG_SEARCH_FORWARD)
8686 				re = TAILQ_FIRST(&s->refs);
8687 			else
8688 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8689 		}
8690 
8691 		if (match_reflist_entry(re, &view->regex)) {
8692 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8693 			s->matched_entry = re;
8694 			break;
8695 		}
8696 
8697 		if (view->searching == TOG_SEARCH_FORWARD)
8698 			re = TAILQ_NEXT(re, entry);
8699 		else
8700 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8701 	}
8702 
8703 	if (s->matched_entry) {
8704 		s->first_displayed_entry = s->matched_entry;
8705 		s->selected = 0;
8706 	}
8707 
8708 	return NULL;
8709 }
8710 
8711 static const struct got_error *
8712 show_ref_view(struct tog_view *view)
8713 {
8714 	const struct got_error *err = NULL;
8715 	struct tog_ref_view_state *s = &view->state.ref;
8716 	struct tog_reflist_entry *re;
8717 	char *line = NULL;
8718 	wchar_t *wline;
8719 	struct tog_color *tc;
8720 	int width, n, scrollx;
8721 	int limit = view->nlines;
8722 
8723 	werase(view->window);
8724 
8725 	s->ndisplayed = 0;
8726 	if (view_is_hsplit_top(view))
8727 		--limit;  /* border */
8728 
8729 	if (limit == 0)
8730 		return NULL;
8731 
8732 	re = s->first_displayed_entry;
8733 
8734 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8735 	    s->nrefs) == -1)
8736 		return got_error_from_errno("asprintf");
8737 
8738 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8739 	if (err) {
8740 		free(line);
8741 		return err;
8742 	}
8743 	if (view_needs_focus_indication(view))
8744 		wstandout(view->window);
8745 	waddwstr(view->window, wline);
8746 	while (width++ < view->ncols)
8747 		waddch(view->window, ' ');
8748 	if (view_needs_focus_indication(view))
8749 		wstandend(view->window);
8750 	free(wline);
8751 	wline = NULL;
8752 	free(line);
8753 	line = NULL;
8754 	if (--limit <= 0)
8755 		return NULL;
8756 
8757 	n = 0;
8758 	view->maxx = 0;
8759 	while (re && limit > 0) {
8760 		char *line = NULL;
8761 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8762 
8763 		if (s->show_date) {
8764 			struct got_commit_object *ci;
8765 			struct got_tag_object *tag;
8766 			struct got_object_id *id;
8767 			struct tm tm;
8768 			time_t t;
8769 
8770 			err = got_ref_resolve(&id, s->repo, re->ref);
8771 			if (err)
8772 				return err;
8773 			err = got_object_open_as_tag(&tag, s->repo, id);
8774 			if (err) {
8775 				if (err->code != GOT_ERR_OBJ_TYPE) {
8776 					free(id);
8777 					return err;
8778 				}
8779 				err = got_object_open_as_commit(&ci, s->repo,
8780 				    id);
8781 				if (err) {
8782 					free(id);
8783 					return err;
8784 				}
8785 				t = got_object_commit_get_committer_time(ci);
8786 				got_object_commit_close(ci);
8787 			} else {
8788 				t = got_object_tag_get_tagger_time(tag);
8789 				got_object_tag_close(tag);
8790 			}
8791 			free(id);
8792 			if (gmtime_r(&t, &tm) == NULL)
8793 				return got_error_from_errno("gmtime_r");
8794 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8795 				return got_error(GOT_ERR_NO_SPACE);
8796 		}
8797 		if (got_ref_is_symbolic(re->ref)) {
8798 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8799 			    ymd : "", got_ref_get_name(re->ref),
8800 			    got_ref_get_symref_target(re->ref)) == -1)
8801 				return got_error_from_errno("asprintf");
8802 		} else if (s->show_ids) {
8803 			struct got_object_id *id;
8804 			char *id_str;
8805 			err = got_ref_resolve(&id, s->repo, re->ref);
8806 			if (err)
8807 				return err;
8808 			err = got_object_id_str(&id_str, id);
8809 			if (err) {
8810 				free(id);
8811 				return err;
8812 			}
8813 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8814 			    got_ref_get_name(re->ref), id_str) == -1) {
8815 				err = got_error_from_errno("asprintf");
8816 				free(id);
8817 				free(id_str);
8818 				return err;
8819 			}
8820 			free(id);
8821 			free(id_str);
8822 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8823 		    got_ref_get_name(re->ref)) == -1)
8824 			return got_error_from_errno("asprintf");
8825 
8826 		/* use full line width to determine view->maxx */
8827 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8828 		if (err) {
8829 			free(line);
8830 			return err;
8831 		}
8832 		view->maxx = MAX(view->maxx, width);
8833 		free(wline);
8834 		wline = NULL;
8835 
8836 		err = format_line(&wline, &width, &scrollx, line, view->x,
8837 		    view->ncols, 0, 0);
8838 		if (err) {
8839 			free(line);
8840 			return err;
8841 		}
8842 		if (n == s->selected) {
8843 			if (view->focussed)
8844 				wstandout(view->window);
8845 			s->selected_entry = re;
8846 		}
8847 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8848 		if (tc)
8849 			wattr_on(view->window,
8850 			    COLOR_PAIR(tc->colorpair), NULL);
8851 		waddwstr(view->window, &wline[scrollx]);
8852 		if (tc)
8853 			wattr_off(view->window,
8854 			    COLOR_PAIR(tc->colorpair), NULL);
8855 		if (width < view->ncols)
8856 			waddch(view->window, '\n');
8857 		if (n == s->selected && view->focussed)
8858 			wstandend(view->window);
8859 		free(line);
8860 		free(wline);
8861 		wline = NULL;
8862 		n++;
8863 		s->ndisplayed++;
8864 		s->last_displayed_entry = re;
8865 
8866 		limit--;
8867 		re = TAILQ_NEXT(re, entry);
8868 	}
8869 
8870 	view_border(view);
8871 	return err;
8872 }
8873 
8874 static const struct got_error *
8875 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8876     struct tog_reflist_entry *re, struct got_repository *repo)
8877 {
8878 	const struct got_error *err = NULL;
8879 	struct got_object_id *commit_id = NULL;
8880 	struct tog_view *tree_view;
8881 
8882 	*new_view = NULL;
8883 
8884 	err = resolve_reflist_entry(&commit_id, re, repo);
8885 	if (err) {
8886 		if (err->code != GOT_ERR_OBJ_TYPE)
8887 			return err;
8888 		else
8889 			return NULL;
8890 	}
8891 
8892 
8893 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8894 	if (tree_view == NULL) {
8895 		err = got_error_from_errno("view_open");
8896 		goto done;
8897 	}
8898 
8899 	err = open_tree_view(tree_view, commit_id,
8900 	    got_ref_get_name(re->ref), repo);
8901 	if (err)
8902 		goto done;
8903 
8904 	*new_view = tree_view;
8905 done:
8906 	free(commit_id);
8907 	return err;
8908 }
8909 
8910 static const struct got_error *
8911 ref_goto_line(struct tog_view *view, int nlines)
8912 {
8913 	const struct got_error		*err = NULL;
8914 	struct tog_ref_view_state	*s = &view->state.ref;
8915 	int				 g, idx = s->selected_entry->idx;
8916 
8917 	g = view->gline;
8918 	view->gline = 0;
8919 
8920 	if (g == 0)
8921 		g = 1;
8922 	else if (g > s->nrefs)
8923 		g = s->nrefs;
8924 
8925 	if (g >= s->first_displayed_entry->idx + 1 &&
8926 	    g <= s->last_displayed_entry->idx + 1 &&
8927 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8928 		s->selected = g - s->first_displayed_entry->idx - 1;
8929 		return NULL;
8930 	}
8931 
8932 	if (idx + 1 < g) {
8933 		err = ref_scroll_down(view, g - idx - 1);
8934 		if (err)
8935 			return err;
8936 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8937 		    s->first_displayed_entry->idx + s->selected < g &&
8938 		    s->selected < s->ndisplayed - 1)
8939 			s->selected = g - s->first_displayed_entry->idx - 1;
8940 	} else if (idx + 1 > g)
8941 		ref_scroll_up(s, idx - g + 1);
8942 
8943 	if (g < nlines && s->first_displayed_entry->idx == 0)
8944 		s->selected = g - 1;
8945 
8946 	return NULL;
8947 
8948 }
8949 
8950 static const struct got_error *
8951 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8952 {
8953 	const struct got_error *err = NULL;
8954 	struct tog_ref_view_state *s = &view->state.ref;
8955 	struct tog_reflist_entry *re;
8956 	int n, nscroll = view->nlines - 1;
8957 
8958 	if (view->gline)
8959 		return ref_goto_line(view, nscroll);
8960 
8961 	switch (ch) {
8962 	case '0':
8963 	case '$':
8964 	case KEY_RIGHT:
8965 	case 'l':
8966 	case KEY_LEFT:
8967 	case 'h':
8968 		horizontal_scroll_input(view, ch);
8969 		break;
8970 	case 'i':
8971 		s->show_ids = !s->show_ids;
8972 		view->count = 0;
8973 		break;
8974 	case 'm':
8975 		s->show_date = !s->show_date;
8976 		view->count = 0;
8977 		break;
8978 	case 'o':
8979 		s->sort_by_date = !s->sort_by_date;
8980 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8981 		view->count = 0;
8982 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8983 		    got_ref_cmp_by_commit_timestamp_descending :
8984 		    tog_ref_cmp_by_name, s->repo);
8985 		if (err)
8986 			break;
8987 		got_reflist_object_id_map_free(tog_refs_idmap);
8988 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8989 		    &tog_refs, s->repo);
8990 		if (err)
8991 			break;
8992 		ref_view_free_refs(s);
8993 		err = ref_view_load_refs(s);
8994 		break;
8995 	case KEY_ENTER:
8996 	case '\r':
8997 		view->count = 0;
8998 		if (!s->selected_entry)
8999 			break;
9000 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
9001 		break;
9002 	case 'T':
9003 		view->count = 0;
9004 		if (!s->selected_entry)
9005 			break;
9006 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
9007 		break;
9008 	case 'g':
9009 	case '=':
9010 	case KEY_HOME:
9011 		s->selected = 0;
9012 		view->count = 0;
9013 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
9014 		break;
9015 	case 'G':
9016 	case '*':
9017 	case KEY_END: {
9018 		int eos = view->nlines - 1;
9019 
9020 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
9021 			--eos;  /* border */
9022 		s->selected = 0;
9023 		view->count = 0;
9024 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
9025 		for (n = 0; n < eos; n++) {
9026 			if (re == NULL)
9027 				break;
9028 			s->first_displayed_entry = re;
9029 			re = TAILQ_PREV(re, tog_reflist_head, entry);
9030 		}
9031 		if (n > 0)
9032 			s->selected = n - 1;
9033 		break;
9034 	}
9035 	case 'k':
9036 	case KEY_UP:
9037 	case CTRL('p'):
9038 		if (s->selected > 0) {
9039 			s->selected--;
9040 			break;
9041 		}
9042 		ref_scroll_up(s, 1);
9043 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9044 			view->count = 0;
9045 		break;
9046 	case CTRL('u'):
9047 	case 'u':
9048 		nscroll /= 2;
9049 		/* FALL THROUGH */
9050 	case KEY_PPAGE:
9051 	case CTRL('b'):
9052 	case 'b':
9053 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9054 			s->selected -= MIN(nscroll, s->selected);
9055 		ref_scroll_up(s, MAX(0, nscroll));
9056 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9057 			view->count = 0;
9058 		break;
9059 	case 'j':
9060 	case KEY_DOWN:
9061 	case CTRL('n'):
9062 		if (s->selected < s->ndisplayed - 1) {
9063 			s->selected++;
9064 			break;
9065 		}
9066 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9067 			/* can't scroll any further */
9068 			view->count = 0;
9069 			break;
9070 		}
9071 		ref_scroll_down(view, 1);
9072 		break;
9073 	case CTRL('d'):
9074 	case 'd':
9075 		nscroll /= 2;
9076 		/* FALL THROUGH */
9077 	case KEY_NPAGE:
9078 	case CTRL('f'):
9079 	case 'f':
9080 	case ' ':
9081 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9082 			/* can't scroll any further; move cursor down */
9083 			if (s->selected < s->ndisplayed - 1)
9084 				s->selected += MIN(nscroll,
9085 				    s->ndisplayed - s->selected - 1);
9086 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9087 				s->selected += s->ndisplayed - s->selected - 1;
9088 			view->count = 0;
9089 			break;
9090 		}
9091 		ref_scroll_down(view, nscroll);
9092 		break;
9093 	case CTRL('l'):
9094 		view->count = 0;
9095 		tog_free_refs();
9096 		err = tog_load_refs(s->repo, s->sort_by_date);
9097 		if (err)
9098 			break;
9099 		ref_view_free_refs(s);
9100 		err = ref_view_load_refs(s);
9101 		break;
9102 	case KEY_RESIZE:
9103 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9104 			s->selected = view->nlines - 2;
9105 		break;
9106 	default:
9107 		view->count = 0;
9108 		break;
9109 	}
9110 
9111 	return err;
9112 }
9113 
9114 __dead static void
9115 usage_ref(void)
9116 {
9117 	endwin();
9118 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9119 	    getprogname());
9120 	exit(1);
9121 }
9122 
9123 static const struct got_error *
9124 cmd_ref(int argc, char *argv[])
9125 {
9126 	const struct got_error *error;
9127 	struct got_repository *repo = NULL;
9128 	struct got_worktree *worktree = NULL;
9129 	char *cwd = NULL, *repo_path = NULL;
9130 	int ch;
9131 	struct tog_view *view;
9132 	int *pack_fds = NULL;
9133 
9134 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9135 		switch (ch) {
9136 		case 'r':
9137 			repo_path = realpath(optarg, NULL);
9138 			if (repo_path == NULL)
9139 				return got_error_from_errno2("realpath",
9140 				    optarg);
9141 			break;
9142 		default:
9143 			usage_ref();
9144 			/* NOTREACHED */
9145 		}
9146 	}
9147 
9148 	argc -= optind;
9149 	argv += optind;
9150 
9151 	if (argc > 1)
9152 		usage_ref();
9153 
9154 	error = got_repo_pack_fds_open(&pack_fds);
9155 	if (error != NULL)
9156 		goto done;
9157 
9158 	if (repo_path == NULL) {
9159 		cwd = getcwd(NULL, 0);
9160 		if (cwd == NULL)
9161 			return got_error_from_errno("getcwd");
9162 		error = got_worktree_open(&worktree, cwd, NULL);
9163 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9164 			goto done;
9165 		if (worktree)
9166 			repo_path =
9167 			    strdup(got_worktree_get_repo_path(worktree));
9168 		else
9169 			repo_path = strdup(cwd);
9170 		if (repo_path == NULL) {
9171 			error = got_error_from_errno("strdup");
9172 			goto done;
9173 		}
9174 	}
9175 
9176 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9177 	if (error != NULL)
9178 		goto done;
9179 
9180 	init_curses();
9181 
9182 	error = apply_unveil(got_repo_get_path(repo), NULL);
9183 	if (error)
9184 		goto done;
9185 
9186 	error = tog_load_refs(repo, 0);
9187 	if (error)
9188 		goto done;
9189 
9190 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9191 	if (view == NULL) {
9192 		error = got_error_from_errno("view_open");
9193 		goto done;
9194 	}
9195 
9196 	error = open_ref_view(view, repo);
9197 	if (error)
9198 		goto done;
9199 
9200 	if (worktree) {
9201 		error = set_tog_base_commit(repo, worktree);
9202 		if (error != NULL)
9203 			goto done;
9204 
9205 		/* Release work tree lock. */
9206 		got_worktree_close(worktree);
9207 		worktree = NULL;
9208 	}
9209 
9210 	error = view_loop(view);
9211 
9212 done:
9213 	free(tog_base_commit.id);
9214 	free(repo_path);
9215 	free(cwd);
9216 	if (worktree != NULL)
9217 		got_worktree_close(worktree);
9218 	if (repo) {
9219 		const struct got_error *close_err = got_repo_close(repo);
9220 		if (close_err)
9221 			error = close_err;
9222 	}
9223 	if (pack_fds) {
9224 		const struct got_error *pack_err =
9225 		    got_repo_pack_fds_close(pack_fds);
9226 		if (error == NULL)
9227 			error = pack_err;
9228 	}
9229 	tog_free_refs();
9230 	return error;
9231 }
9232 
9233 static const struct got_error*
9234 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9235     const char *str)
9236 {
9237 	size_t len;
9238 
9239 	if (win == NULL)
9240 		win = stdscr;
9241 
9242 	len = strlen(str);
9243 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9244 
9245 	if (focus)
9246 		wstandout(win);
9247 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9248 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9249 	if (focus)
9250 		wstandend(win);
9251 
9252 	return NULL;
9253 }
9254 
9255 static const struct got_error *
9256 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9257 {
9258 	off_t *p;
9259 
9260 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9261 	if (p == NULL) {
9262 		free(*line_offsets);
9263 		*line_offsets = NULL;
9264 		return got_error_from_errno("reallocarray");
9265 	}
9266 
9267 	*line_offsets = p;
9268 	(*line_offsets)[*nlines] = off;
9269 	++(*nlines);
9270 	return NULL;
9271 }
9272 
9273 static const struct got_error *
9274 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9275 {
9276 	*ret = 0;
9277 
9278 	for (;n > 0; --n, ++km) {
9279 		char	*t0, *t, *k;
9280 		size_t	 len = 1;
9281 
9282 		if (km->keys == NULL)
9283 			continue;
9284 
9285 		t = t0 = strdup(km->keys);
9286 		if (t0 == NULL)
9287 			return got_error_from_errno("strdup");
9288 
9289 		len += strlen(t);
9290 		while ((k = strsep(&t, " ")) != NULL)
9291 			len += strlen(k) > 1 ? 2 : 0;
9292 		free(t0);
9293 		*ret = MAX(*ret, len);
9294 	}
9295 
9296 	return NULL;
9297 }
9298 
9299 /*
9300  * Write keymap section headers, keys, and key info in km to f.
9301  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9302  * wrap control and symbolic keys in guillemets, else use <>.
9303  */
9304 static const struct got_error *
9305 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9306 {
9307 	int n, len = width;
9308 
9309 	if (km->keys) {
9310 		static const char *u8_glyph[] = {
9311 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9312 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9313 		};
9314 		char	*t0, *t, *k;
9315 		int	 cs, s, first = 1;
9316 
9317 		cs = got_locale_is_utf8();
9318 
9319 		t = t0 = strdup(km->keys);
9320 		if (t0 == NULL)
9321 			return got_error_from_errno("strdup");
9322 
9323 		len = strlen(km->keys);
9324 		while ((k = strsep(&t, " ")) != NULL) {
9325 			s = strlen(k) > 1;  /* control or symbolic key */
9326 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9327 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9328 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9329 			if (n < 0) {
9330 				free(t0);
9331 				return got_error_from_errno("fprintf");
9332 			}
9333 			first = 0;
9334 			len += s ? 2 : 0;
9335 			*off += n;
9336 		}
9337 		free(t0);
9338 	}
9339 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9340 	if (n < 0)
9341 		return got_error_from_errno("fprintf");
9342 	*off += n;
9343 
9344 	return NULL;
9345 }
9346 
9347 static const struct got_error *
9348 format_help(struct tog_help_view_state *s)
9349 {
9350 	const struct got_error		*err = NULL;
9351 	off_t				 off = 0;
9352 	int				 i, max, n, show = s->all;
9353 	static const struct tog_key_map	 km[] = {
9354 #define KEYMAP_(info, type)	{ NULL, (info), type }
9355 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9356 		GENERATE_HELP
9357 #undef KEYMAP_
9358 #undef KEY_
9359 	};
9360 
9361 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9362 	if (err)
9363 		return err;
9364 
9365 	n = nitems(km);
9366 	err = max_key_str(&max, km, n);
9367 	if (err)
9368 		return err;
9369 
9370 	for (i = 0; i < n; ++i) {
9371 		if (km[i].keys == NULL) {
9372 			show = s->all;
9373 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9374 			    km[i].type == s->type || s->all)
9375 				show = 1;
9376 		}
9377 		if (show) {
9378 			err = format_help_line(&off, s->f, &km[i], max);
9379 			if (err)
9380 				return err;
9381 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9382 			if (err)
9383 				return err;
9384 		}
9385 	}
9386 	fputc('\n', s->f);
9387 	++off;
9388 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9389 	return err;
9390 }
9391 
9392 static const struct got_error *
9393 create_help(struct tog_help_view_state *s)
9394 {
9395 	FILE			*f;
9396 	const struct got_error	*err;
9397 
9398 	free(s->line_offsets);
9399 	s->line_offsets = NULL;
9400 	s->nlines = 0;
9401 
9402 	f = got_opentemp();
9403 	if (f == NULL)
9404 		return got_error_from_errno("got_opentemp");
9405 	s->f = f;
9406 
9407 	err = format_help(s);
9408 	if (err)
9409 		return err;
9410 
9411 	if (s->f && fflush(s->f) != 0)
9412 		return got_error_from_errno("fflush");
9413 
9414 	return NULL;
9415 }
9416 
9417 static const struct got_error *
9418 search_start_help_view(struct tog_view *view)
9419 {
9420 	view->state.help.matched_line = 0;
9421 	return NULL;
9422 }
9423 
9424 static void
9425 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9426     size_t *nlines, int **first, int **last, int **match, int **selected)
9427 {
9428 	struct tog_help_view_state *s = &view->state.help;
9429 
9430 	*f = s->f;
9431 	*nlines = s->nlines;
9432 	*line_offsets = s->line_offsets;
9433 	*match = &s->matched_line;
9434 	*first = &s->first_displayed_line;
9435 	*last = &s->last_displayed_line;
9436 	*selected = &s->selected_line;
9437 }
9438 
9439 static const struct got_error *
9440 show_help_view(struct tog_view *view)
9441 {
9442 	struct tog_help_view_state	*s = &view->state.help;
9443 	const struct got_error		*err;
9444 	regmatch_t			*regmatch = &view->regmatch;
9445 	wchar_t				*wline;
9446 	char				*line;
9447 	ssize_t				 linelen;
9448 	size_t				 linesz = 0;
9449 	int				 width, nprinted = 0, rc = 0;
9450 	int				 eos = view->nlines;
9451 
9452 	if (view_is_hsplit_top(view))
9453 		--eos;  /* account for border */
9454 
9455 	s->lineno = 0;
9456 	rewind(s->f);
9457 	werase(view->window);
9458 
9459 	if (view->gline > s->nlines - 1)
9460 		view->gline = s->nlines - 1;
9461 
9462 	err = win_draw_center(view->window, 0, 0, view->ncols,
9463 	    view_needs_focus_indication(view),
9464 	    "tog help (press q to return to tog)");
9465 	if (err)
9466 		return err;
9467 	if (eos <= 1)
9468 		return NULL;
9469 	waddstr(view->window, "\n\n");
9470 	eos -= 2;
9471 
9472 	s->eof = 0;
9473 	view->maxx = 0;
9474 	line = NULL;
9475 	while (eos > 0 && nprinted < eos) {
9476 		attr_t attr = 0;
9477 
9478 		linelen = getline(&line, &linesz, s->f);
9479 		if (linelen == -1) {
9480 			if (!feof(s->f)) {
9481 				free(line);
9482 				return got_ferror(s->f, GOT_ERR_IO);
9483 			}
9484 			s->eof = 1;
9485 			break;
9486 		}
9487 		if (++s->lineno < s->first_displayed_line)
9488 			continue;
9489 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9490 			continue;
9491 		if (s->lineno == view->hiline)
9492 			attr = A_STANDOUT;
9493 
9494 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9495 		    view->x ? 1 : 0);
9496 		if (err) {
9497 			free(line);
9498 			return err;
9499 		}
9500 		view->maxx = MAX(view->maxx, width);
9501 		free(wline);
9502 		wline = NULL;
9503 
9504 		if (attr)
9505 			wattron(view->window, attr);
9506 		if (s->first_displayed_line + nprinted == s->matched_line &&
9507 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9508 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9509 			    view->window, view->x, regmatch);
9510 			if (err) {
9511 				free(line);
9512 				return err;
9513 			}
9514 		} else {
9515 			int skip;
9516 
9517 			err = format_line(&wline, &width, &skip, line,
9518 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9519 			if (err) {
9520 				free(line);
9521 				return err;
9522 			}
9523 			waddwstr(view->window, &wline[skip]);
9524 			free(wline);
9525 			wline = NULL;
9526 		}
9527 		if (s->lineno == view->hiline) {
9528 			while (width++ < view->ncols)
9529 				waddch(view->window, ' ');
9530 		} else {
9531 			if (width < view->ncols)
9532 				waddch(view->window, '\n');
9533 		}
9534 		if (attr)
9535 			wattroff(view->window, attr);
9536 		if (++nprinted == 1)
9537 			s->first_displayed_line = s->lineno;
9538 	}
9539 	free(line);
9540 	if (nprinted > 0)
9541 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9542 	else
9543 		s->last_displayed_line = s->first_displayed_line;
9544 
9545 	view_border(view);
9546 
9547 	if (s->eof) {
9548 		rc = waddnstr(view->window,
9549 		    "See the tog(1) manual page for full documentation",
9550 		    view->ncols - 1);
9551 		if (rc == ERR)
9552 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9553 	} else {
9554 		wmove(view->window, view->nlines - 1, 0);
9555 		wclrtoeol(view->window);
9556 		wstandout(view->window);
9557 		rc = waddnstr(view->window, "scroll down for more...",
9558 		    view->ncols - 1);
9559 		if (rc == ERR)
9560 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9561 		if (getcurx(view->window) < view->ncols - 6) {
9562 			rc = wprintw(view->window, "[%.0f%%]",
9563 			    100.00 * s->last_displayed_line / s->nlines);
9564 			if (rc == ERR)
9565 				return got_error_msg(GOT_ERR_IO, "wprintw");
9566 		}
9567 		wstandend(view->window);
9568 	}
9569 
9570 	return NULL;
9571 }
9572 
9573 static const struct got_error *
9574 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9575 {
9576 	struct tog_help_view_state	*s = &view->state.help;
9577 	const struct got_error		*err = NULL;
9578 	char				*line = NULL;
9579 	ssize_t				 linelen;
9580 	size_t				 linesz = 0;
9581 	int				 eos, nscroll;
9582 
9583 	eos = nscroll = view->nlines;
9584 	if (view_is_hsplit_top(view))
9585 		--eos;  /* border */
9586 
9587 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9588 
9589 	switch (ch) {
9590 	case '0':
9591 	case '$':
9592 	case KEY_RIGHT:
9593 	case 'l':
9594 	case KEY_LEFT:
9595 	case 'h':
9596 		horizontal_scroll_input(view, ch);
9597 		break;
9598 	case 'g':
9599 	case KEY_HOME:
9600 		s->first_displayed_line = 1;
9601 		view->count = 0;
9602 		break;
9603 	case 'G':
9604 	case KEY_END:
9605 		view->count = 0;
9606 		if (s->eof)
9607 			break;
9608 		s->first_displayed_line = (s->nlines - eos) + 3;
9609 		s->eof = 1;
9610 		break;
9611 	case 'k':
9612 	case KEY_UP:
9613 		if (s->first_displayed_line > 1)
9614 			--s->first_displayed_line;
9615 		else
9616 			view->count = 0;
9617 		break;
9618 	case CTRL('u'):
9619 	case 'u':
9620 		nscroll /= 2;
9621 		/* FALL THROUGH */
9622 	case KEY_PPAGE:
9623 	case CTRL('b'):
9624 	case 'b':
9625 		if (s->first_displayed_line == 1) {
9626 			view->count = 0;
9627 			break;
9628 		}
9629 		while (--nscroll > 0 && s->first_displayed_line > 1)
9630 			s->first_displayed_line--;
9631 		break;
9632 	case 'j':
9633 	case KEY_DOWN:
9634 	case CTRL('n'):
9635 		if (!s->eof)
9636 			++s->first_displayed_line;
9637 		else
9638 			view->count = 0;
9639 		break;
9640 	case CTRL('d'):
9641 	case 'd':
9642 		nscroll /= 2;
9643 		/* FALL THROUGH */
9644 	case KEY_NPAGE:
9645 	case CTRL('f'):
9646 	case 'f':
9647 	case ' ':
9648 		if (s->eof) {
9649 			view->count = 0;
9650 			break;
9651 		}
9652 		while (!s->eof && --nscroll > 0) {
9653 			linelen = getline(&line, &linesz, s->f);
9654 			s->first_displayed_line++;
9655 			if (linelen == -1) {
9656 				if (feof(s->f))
9657 					s->eof = 1;
9658 				else
9659 					err = got_ferror(s->f, GOT_ERR_IO);
9660 				break;
9661 			}
9662 		}
9663 		free(line);
9664 		break;
9665 	default:
9666 		view->count = 0;
9667 		break;
9668 	}
9669 
9670 	return err;
9671 }
9672 
9673 static const struct got_error *
9674 close_help_view(struct tog_view *view)
9675 {
9676 	struct tog_help_view_state *s = &view->state.help;
9677 
9678 	free(s->line_offsets);
9679 	s->line_offsets = NULL;
9680 	if (fclose(s->f) == EOF)
9681 		return got_error_from_errno("fclose");
9682 
9683 	return NULL;
9684 }
9685 
9686 static const struct got_error *
9687 reset_help_view(struct tog_view *view)
9688 {
9689 	struct tog_help_view_state *s = &view->state.help;
9690 
9691 
9692 	if (s->f && fclose(s->f) == EOF)
9693 		return got_error_from_errno("fclose");
9694 
9695 	wclear(view->window);
9696 	view->count = 0;
9697 	view->x = 0;
9698 	s->all = !s->all;
9699 	s->first_displayed_line = 1;
9700 	s->last_displayed_line = view->nlines;
9701 	s->matched_line = 0;
9702 
9703 	return create_help(s);
9704 }
9705 
9706 static const struct got_error *
9707 open_help_view(struct tog_view *view, struct tog_view *parent)
9708 {
9709 	const struct got_error		*err = NULL;
9710 	struct tog_help_view_state	*s = &view->state.help;
9711 
9712 	s->type = (enum tog_keymap_type)parent->type;
9713 	s->first_displayed_line = 1;
9714 	s->last_displayed_line = view->nlines;
9715 	s->selected_line = 1;
9716 
9717 	view->show = show_help_view;
9718 	view->input = input_help_view;
9719 	view->reset = reset_help_view;
9720 	view->close = close_help_view;
9721 	view->search_start = search_start_help_view;
9722 	view->search_setup = search_setup_help_view;
9723 	view->search_next = search_next_view_match;
9724 
9725 	err = create_help(s);
9726 	return err;
9727 }
9728 
9729 static const struct got_error *
9730 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9731     enum tog_view_type request, int y, int x)
9732 {
9733 	const struct got_error *err = NULL;
9734 
9735 	*new_view = NULL;
9736 
9737 	switch (request) {
9738 	case TOG_VIEW_DIFF:
9739 		if (view->type == TOG_VIEW_LOG) {
9740 			struct tog_log_view_state *s = &view->state.log;
9741 
9742 			err = open_diff_view_for_commit(new_view, y, x,
9743 			    s->selected_entry->commit, s->selected_entry->id,
9744 			    view, s->repo);
9745 		} else
9746 			return got_error_msg(GOT_ERR_NOT_IMPL,
9747 			    "parent/child view pair not supported");
9748 		break;
9749 	case TOG_VIEW_BLAME:
9750 		if (view->type == TOG_VIEW_TREE) {
9751 			struct tog_tree_view_state *s = &view->state.tree;
9752 
9753 			err = blame_tree_entry(new_view, y, x,
9754 			    s->selected_entry, &s->parents, s->commit_id,
9755 			    s->repo);
9756 		} else
9757 			return got_error_msg(GOT_ERR_NOT_IMPL,
9758 			    "parent/child view pair not supported");
9759 		break;
9760 	case TOG_VIEW_LOG:
9761 		if (view->type == TOG_VIEW_BLAME)
9762 			err = log_annotated_line(new_view, y, x,
9763 			    view->state.blame.repo, view->state.blame.id_to_log);
9764 		else if (view->type == TOG_VIEW_TREE)
9765 			err = log_selected_tree_entry(new_view, y, x,
9766 			    &view->state.tree);
9767 		else if (view->type == TOG_VIEW_REF)
9768 			err = log_ref_entry(new_view, y, x,
9769 			    view->state.ref.selected_entry,
9770 			    view->state.ref.repo);
9771 		else
9772 			return got_error_msg(GOT_ERR_NOT_IMPL,
9773 			    "parent/child view pair not supported");
9774 		break;
9775 	case TOG_VIEW_TREE:
9776 		if (view->type == TOG_VIEW_LOG)
9777 			err = browse_commit_tree(new_view, y, x,
9778 			    view->state.log.selected_entry,
9779 			    view->state.log.in_repo_path,
9780 			    view->state.log.head_ref_name,
9781 			    view->state.log.repo);
9782 		else if (view->type == TOG_VIEW_REF)
9783 			err = browse_ref_tree(new_view, y, x,
9784 			    view->state.ref.selected_entry,
9785 			    view->state.ref.repo);
9786 		else
9787 			return got_error_msg(GOT_ERR_NOT_IMPL,
9788 			    "parent/child view pair not supported");
9789 		break;
9790 	case TOG_VIEW_REF:
9791 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9792 		if (*new_view == NULL)
9793 			return got_error_from_errno("view_open");
9794 		if (view->type == TOG_VIEW_LOG)
9795 			err = open_ref_view(*new_view, view->state.log.repo);
9796 		else if (view->type == TOG_VIEW_TREE)
9797 			err = open_ref_view(*new_view, view->state.tree.repo);
9798 		else
9799 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9800 			    "parent/child view pair not supported");
9801 		if (err)
9802 			view_close(*new_view);
9803 		break;
9804 	case TOG_VIEW_HELP:
9805 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9806 		if (*new_view == NULL)
9807 			return got_error_from_errno("view_open");
9808 		err = open_help_view(*new_view, view);
9809 		if (err)
9810 			view_close(*new_view);
9811 		break;
9812 	default:
9813 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9814 	}
9815 
9816 	return err;
9817 }
9818 
9819 /*
9820  * If view was scrolled down to move the selected line into view when opening a
9821  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9822  */
9823 static void
9824 offset_selection_up(struct tog_view *view)
9825 {
9826 	switch (view->type) {
9827 	case TOG_VIEW_BLAME: {
9828 		struct tog_blame_view_state *s = &view->state.blame;
9829 		if (s->first_displayed_line == 1) {
9830 			s->selected_line = MAX(s->selected_line - view->offset,
9831 			    1);
9832 			break;
9833 		}
9834 		if (s->first_displayed_line > view->offset)
9835 			s->first_displayed_line -= view->offset;
9836 		else
9837 			s->first_displayed_line = 1;
9838 		s->selected_line += view->offset;
9839 		break;
9840 	}
9841 	case TOG_VIEW_LOG:
9842 		log_scroll_up(&view->state.log, view->offset);
9843 		view->state.log.selected += view->offset;
9844 		break;
9845 	case TOG_VIEW_REF:
9846 		ref_scroll_up(&view->state.ref, view->offset);
9847 		view->state.ref.selected += view->offset;
9848 		break;
9849 	case TOG_VIEW_TREE:
9850 		tree_scroll_up(&view->state.tree, view->offset);
9851 		view->state.tree.selected += view->offset;
9852 		break;
9853 	default:
9854 		break;
9855 	}
9856 
9857 	view->offset = 0;
9858 }
9859 
9860 /*
9861  * If the selected line is in the section of screen covered by the bottom split,
9862  * scroll down offset lines to move it into view and index its new position.
9863  */
9864 static const struct got_error *
9865 offset_selection_down(struct tog_view *view)
9866 {
9867 	const struct got_error	*err = NULL;
9868 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9869 	int			*selected = NULL;
9870 	int			 header, offset;
9871 
9872 	switch (view->type) {
9873 	case TOG_VIEW_BLAME: {
9874 		struct tog_blame_view_state *s = &view->state.blame;
9875 		header = 3;
9876 		scrolld = NULL;
9877 		if (s->selected_line > view->nlines - header) {
9878 			offset = abs(view->nlines - s->selected_line - header);
9879 			s->first_displayed_line += offset;
9880 			s->selected_line -= offset;
9881 			view->offset = offset;
9882 		}
9883 		break;
9884 	}
9885 	case TOG_VIEW_LOG: {
9886 		struct tog_log_view_state *s = &view->state.log;
9887 		scrolld = &log_scroll_down;
9888 		header = view_is_parent_view(view) ? 3 : 2;
9889 		selected = &s->selected;
9890 		break;
9891 	}
9892 	case TOG_VIEW_REF: {
9893 		struct tog_ref_view_state *s = &view->state.ref;
9894 		scrolld = &ref_scroll_down;
9895 		header = 3;
9896 		selected = &s->selected;
9897 		break;
9898 	}
9899 	case TOG_VIEW_TREE: {
9900 		struct tog_tree_view_state *s = &view->state.tree;
9901 		scrolld = &tree_scroll_down;
9902 		header = 5;
9903 		selected = &s->selected;
9904 		break;
9905 	}
9906 	default:
9907 		selected = NULL;
9908 		scrolld = NULL;
9909 		header = 0;
9910 		break;
9911 	}
9912 
9913 	if (selected && *selected > view->nlines - header) {
9914 		offset = abs(view->nlines - *selected - header);
9915 		view->offset = offset;
9916 		if (scrolld && offset) {
9917 			err = scrolld(view, offset);
9918 			*selected -= offset;
9919 		}
9920 	}
9921 
9922 	return err;
9923 }
9924 
9925 static void
9926 list_commands(FILE *fp)
9927 {
9928 	size_t i;
9929 
9930 	fprintf(fp, "commands:");
9931 	for (i = 0; i < nitems(tog_commands); i++) {
9932 		const struct tog_cmd *cmd = &tog_commands[i];
9933 		fprintf(fp, " %s", cmd->name);
9934 	}
9935 	fputc('\n', fp);
9936 }
9937 
9938 __dead static void
9939 usage(int hflag, int status)
9940 {
9941 	FILE *fp = (status == 0) ? stdout : stderr;
9942 
9943 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9944 	    getprogname());
9945 	if (hflag) {
9946 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9947 		list_commands(fp);
9948 	}
9949 	exit(status);
9950 }
9951 
9952 static char **
9953 make_argv(int argc, ...)
9954 {
9955 	va_list ap;
9956 	char **argv;
9957 	int i;
9958 
9959 	va_start(ap, argc);
9960 
9961 	argv = calloc(argc, sizeof(char *));
9962 	if (argv == NULL)
9963 		err(1, "calloc");
9964 	for (i = 0; i < argc; i++) {
9965 		argv[i] = strdup(va_arg(ap, char *));
9966 		if (argv[i] == NULL)
9967 			err(1, "strdup");
9968 	}
9969 
9970 	va_end(ap);
9971 	return argv;
9972 }
9973 
9974 /*
9975  * Try to convert 'tog path' into a 'tog log path' command.
9976  * The user could simply have mistyped the command rather than knowingly
9977  * provided a path. So check whether argv[0] can in fact be resolved
9978  * to a path in the HEAD commit and print a special error if not.
9979  * This hack is for mpi@ <3
9980  */
9981 static const struct got_error *
9982 tog_log_with_path(int argc, char *argv[])
9983 {
9984 	const struct got_error *error = NULL, *close_err;
9985 	const struct tog_cmd *cmd = NULL;
9986 	struct got_repository *repo = NULL;
9987 	struct got_worktree *worktree = NULL;
9988 	struct got_object_id *commit_id = NULL, *id = NULL;
9989 	struct got_commit_object *commit = NULL;
9990 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9991 	char *commit_id_str = NULL, **cmd_argv = NULL;
9992 	int *pack_fds = NULL;
9993 
9994 	cwd = getcwd(NULL, 0);
9995 	if (cwd == NULL)
9996 		return got_error_from_errno("getcwd");
9997 
9998 	error = got_repo_pack_fds_open(&pack_fds);
9999 	if (error != NULL)
10000 		goto done;
10001 
10002 	error = got_worktree_open(&worktree, cwd, NULL);
10003 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
10004 		goto done;
10005 
10006 	if (worktree)
10007 		repo_path = strdup(got_worktree_get_repo_path(worktree));
10008 	else
10009 		repo_path = strdup(cwd);
10010 	if (repo_path == NULL) {
10011 		error = got_error_from_errno("strdup");
10012 		goto done;
10013 	}
10014 
10015 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
10016 	if (error != NULL)
10017 		goto done;
10018 
10019 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
10020 	    repo, worktree);
10021 	if (error)
10022 		goto done;
10023 
10024 	error = tog_load_refs(repo, 0);
10025 	if (error)
10026 		goto done;
10027 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
10028 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
10029 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
10030 	if (error)
10031 		goto done;
10032 
10033 	if (worktree) {
10034 		got_worktree_close(worktree);
10035 		worktree = NULL;
10036 	}
10037 
10038 	error = got_object_open_as_commit(&commit, repo, commit_id);
10039 	if (error)
10040 		goto done;
10041 
10042 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10043 	if (error) {
10044 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10045 			goto done;
10046 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10047 		    getprogname(), argv[0]);
10048 		usage(1, 1);
10049 		/* not reached */
10050 	}
10051 
10052 	error = got_object_id_str(&commit_id_str, commit_id);
10053 	if (error)
10054 		goto done;
10055 
10056 	cmd = &tog_commands[0]; /* log */
10057 	argc = 4;
10058 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10059 	error = cmd->cmd_main(argc, cmd_argv);
10060 done:
10061 	if (repo) {
10062 		close_err = got_repo_close(repo);
10063 		if (error == NULL)
10064 			error = close_err;
10065 	}
10066 	if (commit)
10067 		got_object_commit_close(commit);
10068 	if (worktree)
10069 		got_worktree_close(worktree);
10070 	if (pack_fds) {
10071 		const struct got_error *pack_err =
10072 		    got_repo_pack_fds_close(pack_fds);
10073 		if (error == NULL)
10074 			error = pack_err;
10075 	}
10076 	free(id);
10077 	free(commit_id_str);
10078 	free(commit_id);
10079 	free(cwd);
10080 	free(repo_path);
10081 	free(in_repo_path);
10082 	if (cmd_argv) {
10083 		int i;
10084 		for (i = 0; i < argc; i++)
10085 			free(cmd_argv[i]);
10086 		free(cmd_argv);
10087 	}
10088 	tog_free_refs();
10089 	return error;
10090 }
10091 
10092 int
10093 main(int argc, char *argv[])
10094 {
10095 	const struct got_error *io_err, *error = NULL;
10096 	const struct tog_cmd *cmd = NULL;
10097 	int ch, hflag = 0, Vflag = 0;
10098 	char **cmd_argv = NULL;
10099 	static const struct option longopts[] = {
10100 	    { "version", no_argument, NULL, 'V' },
10101 	    { NULL, 0, NULL, 0}
10102 	};
10103 	char *diff_algo_str = NULL;
10104 	const char *test_script_path;
10105 
10106 	setlocale(LC_CTYPE, "");
10107 
10108 	/*
10109 	 * Override default signal handlers before starting ncurses.
10110 	 * This should prevent ncurses from installing its own
10111 	 * broken cleanup() signal handler.
10112 	 */
10113 	signal(SIGWINCH, tog_sigwinch);
10114 	signal(SIGPIPE, tog_sigpipe);
10115 	signal(SIGCONT, tog_sigcont);
10116 	signal(SIGINT, tog_sigint);
10117 	signal(SIGTERM, tog_sigterm);
10118 
10119 	/*
10120 	 * Test mode init must happen before pledge() because "tty" will
10121 	 * not allow TTY-related ioctls to occur via regular files.
10122 	 */
10123 	test_script_path = getenv("TOG_TEST_SCRIPT");
10124 	if (test_script_path != NULL) {
10125 		error = init_mock_term(test_script_path);
10126 		if (error) {
10127 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10128 			return 1;
10129 		}
10130 	} else if (!isatty(STDIN_FILENO))
10131 		errx(1, "standard input is not a tty");
10132 
10133 #if !defined(PROFILE)
10134 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10135 	    NULL) == -1)
10136 		err(1, "pledge");
10137 #endif
10138 
10139 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10140 		switch (ch) {
10141 		case 'h':
10142 			hflag = 1;
10143 			break;
10144 		case 'V':
10145 			Vflag = 1;
10146 			break;
10147 		default:
10148 			usage(hflag, 1);
10149 			/* NOTREACHED */
10150 		}
10151 	}
10152 
10153 	argc -= optind;
10154 	argv += optind;
10155 	optind = 1;
10156 	optreset = 1;
10157 
10158 	if (Vflag) {
10159 		got_version_print_str();
10160 		return 0;
10161 	}
10162 
10163 	if (argc == 0) {
10164 		if (hflag)
10165 			usage(hflag, 0);
10166 		/* Build an argument vector which runs a default command. */
10167 		cmd = &tog_commands[0];
10168 		argc = 1;
10169 		cmd_argv = make_argv(argc, cmd->name);
10170 	} else {
10171 		size_t i;
10172 
10173 		/* Did the user specify a command? */
10174 		for (i = 0; i < nitems(tog_commands); i++) {
10175 			if (strncmp(tog_commands[i].name, argv[0],
10176 			    strlen(argv[0])) == 0) {
10177 				cmd = &tog_commands[i];
10178 				break;
10179 			}
10180 		}
10181 	}
10182 
10183 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10184 	if (diff_algo_str) {
10185 		if (strcasecmp(diff_algo_str, "patience") == 0)
10186 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10187 		if (strcasecmp(diff_algo_str, "myers") == 0)
10188 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10189 	}
10190 
10191 	tog_base_commit.idx = -1;
10192 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10193 
10194 	if (cmd == NULL) {
10195 		if (argc != 1)
10196 			usage(0, 1);
10197 		/* No command specified; try log with a path */
10198 		error = tog_log_with_path(argc, argv);
10199 	} else {
10200 		if (hflag)
10201 			cmd->cmd_usage();
10202 		else
10203 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10204 	}
10205 
10206 	if (using_mock_io) {
10207 		io_err = tog_io_close();
10208 		if (error == NULL)
10209 			error = io_err;
10210 	}
10211 	endwin();
10212 	if (cmd_argv) {
10213 		int i;
10214 		for (i = 0; i < argc; i++)
10215 			free(cmd_argv[i]);
10216 		free(cmd_argv);
10217 	}
10218 
10219 	if (error && error->code != GOT_ERR_CANCELLED &&
10220 	    error->code != GOT_ERR_EOF &&
10221 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10222 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10223 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10224 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10225 		return 1;
10226 	}
10227 	return 0;
10228 }