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 <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static struct {
155 	struct got_object_id	*id;
156 	int			 idx;
157 	char			 marker;
158 } tog_base_commit;
159 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
160 
161 static const struct got_error *
162 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
163     struct got_reference* re2)
164 {
165 	const char *name1 = got_ref_get_name(re1);
166 	const char *name2 = got_ref_get_name(re2);
167 	int isbackup1, isbackup2;
168 
169 	/* Sort backup refs towards the bottom of the list. */
170 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
171 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
172 	if (!isbackup1 && isbackup2) {
173 		*cmp = -1;
174 		return NULL;
175 	} else if (isbackup1 && !isbackup2) {
176 		*cmp = 1;
177 		return NULL;
178 	}
179 
180 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 tog_load_refs(struct got_repository *repo, int sort_by_date)
186 {
187 	const struct got_error *err;
188 
189 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
190 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
191 	    repo);
192 	if (err)
193 		return err;
194 
195 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
196 	    repo);
197 }
198 
199 static void
200 tog_free_refs(void)
201 {
202 	if (tog_refs_idmap) {
203 		got_reflist_object_id_map_free(tog_refs_idmap);
204 		tog_refs_idmap = NULL;
205 	}
206 	got_ref_list_free(&tog_refs);
207 }
208 
209 static const struct got_error *
210 add_color(struct tog_colors *colors, const char *pattern,
211     int idx, short color)
212 {
213 	const struct got_error *err = NULL;
214 	struct tog_color *tc;
215 	int regerr = 0;
216 
217 	if (idx < 1 || idx > COLOR_PAIRS - 1)
218 		return NULL;
219 
220 	init_pair(idx, color, -1);
221 
222 	tc = calloc(1, sizeof(*tc));
223 	if (tc == NULL)
224 		return got_error_from_errno("calloc");
225 	regerr = regcomp(&tc->regex, pattern,
226 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
227 	if (regerr) {
228 		static char regerr_msg[512];
229 		static char err_msg[512];
230 		regerror(regerr, &tc->regex, regerr_msg,
231 		    sizeof(regerr_msg));
232 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
233 		    regerr_msg);
234 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
235 		free(tc);
236 		return err;
237 	}
238 	tc->colorpair = idx;
239 	STAILQ_INSERT_HEAD(colors, tc, entry);
240 	return NULL;
241 }
242 
243 static void
244 free_colors(struct tog_colors *colors)
245 {
246 	struct tog_color *tc;
247 
248 	while (!STAILQ_EMPTY(colors)) {
249 		tc = STAILQ_FIRST(colors);
250 		STAILQ_REMOVE_HEAD(colors, entry);
251 		regfree(&tc->regex);
252 		free(tc);
253 	}
254 }
255 
256 static struct tog_color *
257 get_color(struct tog_colors *colors, int colorpair)
258 {
259 	struct tog_color *tc = NULL;
260 
261 	STAILQ_FOREACH(tc, colors, entry) {
262 		if (tc->colorpair == colorpair)
263 			return tc;
264 	}
265 
266 	return NULL;
267 }
268 
269 static int
270 default_color_value(const char *envvar)
271 {
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
273 		return COLOR_MAGENTA;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
283 		return COLOR_MAGENTA;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
291 		return COLOR_CYAN;
292 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
295 		return COLOR_GREEN;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
297 		return COLOR_MAGENTA;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
299 		return COLOR_YELLOW;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
301 		return COLOR_CYAN;
302 
303 	return -1;
304 }
305 
306 static int
307 get_color_value(const char *envvar)
308 {
309 	const char *val = getenv(envvar);
310 
311 	if (val == NULL)
312 		return default_color_value(envvar);
313 
314 	if (strcasecmp(val, "black") == 0)
315 		return COLOR_BLACK;
316 	if (strcasecmp(val, "red") == 0)
317 		return COLOR_RED;
318 	if (strcasecmp(val, "green") == 0)
319 		return COLOR_GREEN;
320 	if (strcasecmp(val, "yellow") == 0)
321 		return COLOR_YELLOW;
322 	if (strcasecmp(val, "blue") == 0)
323 		return COLOR_BLUE;
324 	if (strcasecmp(val, "magenta") == 0)
325 		return COLOR_MAGENTA;
326 	if (strcasecmp(val, "cyan") == 0)
327 		return COLOR_CYAN;
328 	if (strcasecmp(val, "white") == 0)
329 		return COLOR_WHITE;
330 	if (strcasecmp(val, "default") == 0)
331 		return -1;
332 
333 	return default_color_value(envvar);
334 }
335 
336 struct tog_diff_view_state {
337 	struct got_object_id *id1, *id2;
338 	const char *label1, *label2;
339 	FILE *f, *f1, *f2;
340 	int fd1, fd2;
341 	int lineno;
342 	int first_displayed_line;
343 	int last_displayed_line;
344 	int eof;
345 	int diff_context;
346 	int ignore_whitespace;
347 	int force_text_diff;
348 	struct got_repository *repo;
349 	struct got_diff_line *lines;
350 	size_t nlines;
351 	int matched_line;
352 	int selected_line;
353 
354 	/* passed from log or blame view; may be NULL */
355 	struct tog_view *parent_view;
356 };
357 
358 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
359 static volatile sig_atomic_t tog_thread_error;
360 
361 struct tog_log_thread_args {
362 	pthread_cond_t need_commits;
363 	pthread_cond_t commit_loaded;
364 	int commits_needed;
365 	int load_all;
366 	struct got_commit_graph *graph;
367 	struct commit_queue *real_commits;
368 	const char *in_repo_path;
369 	struct got_object_id *start_id;
370 	struct got_repository *repo;
371 	int *pack_fds;
372 	int log_complete;
373 	pthread_cond_t log_loaded;
374 	sig_atomic_t *quit;
375 	struct commit_queue_entry **first_displayed_entry;
376 	struct commit_queue_entry **selected_entry;
377 	int *searching;
378 	int *search_next_done;
379 	regex_t *regex;
380 	int *limiting;
381 	int limit_match;
382 	regex_t *limit_regex;
383 	struct commit_queue *limit_commits;
384 	struct got_worktree *worktree;
385 	int need_commit_marker;
386 };
387 
388 struct tog_log_view_state {
389 	struct commit_queue *commits;
390 	struct commit_queue_entry *first_displayed_entry;
391 	struct commit_queue_entry *last_displayed_entry;
392 	struct commit_queue_entry *selected_entry;
393 	struct commit_queue real_commits;
394 	int selected;
395 	char *in_repo_path;
396 	char *head_ref_name;
397 	int log_branches;
398 	struct got_repository *repo;
399 	struct got_object_id *start_id;
400 	sig_atomic_t quit;
401 	pthread_t thread;
402 	struct tog_log_thread_args thread_args;
403 	struct commit_queue_entry *matched_entry;
404 	struct commit_queue_entry *search_entry;
405 	struct tog_colors colors;
406 	int use_committer;
407 	int limit_view;
408 	regex_t limit_regex;
409 	struct commit_queue limit_commits;
410 };
411 
412 #define TOG_COLOR_DIFF_MINUS		1
413 #define TOG_COLOR_DIFF_PLUS		2
414 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
415 #define TOG_COLOR_DIFF_META		4
416 #define TOG_COLOR_TREE_SUBMODULE	5
417 #define TOG_COLOR_TREE_SYMLINK		6
418 #define TOG_COLOR_TREE_DIRECTORY	7
419 #define TOG_COLOR_TREE_EXECUTABLE	8
420 #define TOG_COLOR_COMMIT		9
421 #define TOG_COLOR_AUTHOR		10
422 #define TOG_COLOR_DATE			11
423 #define TOG_COLOR_REFS_HEADS		12
424 #define TOG_COLOR_REFS_TAGS		13
425 #define TOG_COLOR_REFS_REMOTES		14
426 #define TOG_COLOR_REFS_BACKUP		15
427 
428 struct tog_blame_cb_args {
429 	struct tog_blame_line *lines; /* one per line */
430 	int nlines;
431 
432 	struct tog_view *view;
433 	struct got_object_id *commit_id;
434 	int *quit;
435 };
436 
437 struct tog_blame_thread_args {
438 	const char *path;
439 	struct got_repository *repo;
440 	struct tog_blame_cb_args *cb_args;
441 	int *complete;
442 	got_cancel_cb cancel_cb;
443 	void *cancel_arg;
444 	pthread_cond_t blame_complete;
445 };
446 
447 struct tog_blame {
448 	FILE *f;
449 	off_t filesize;
450 	struct tog_blame_line *lines;
451 	int nlines;
452 	off_t *line_offsets;
453 	pthread_t thread;
454 	struct tog_blame_thread_args thread_args;
455 	struct tog_blame_cb_args cb_args;
456 	const char *path;
457 	int *pack_fds;
458 };
459 
460 struct tog_blame_view_state {
461 	int first_displayed_line;
462 	int last_displayed_line;
463 	int selected_line;
464 	int last_diffed_line;
465 	int blame_complete;
466 	int eof;
467 	int done;
468 	struct got_object_id_queue blamed_commits;
469 	struct got_object_qid *blamed_commit;
470 	char *path;
471 	struct got_repository *repo;
472 	struct got_object_id *commit_id;
473 	struct got_object_id *id_to_log;
474 	struct tog_blame blame;
475 	int matched_line;
476 	struct tog_colors colors;
477 };
478 
479 struct tog_parent_tree {
480 	TAILQ_ENTRY(tog_parent_tree) entry;
481 	struct got_tree_object *tree;
482 	struct got_tree_entry *first_displayed_entry;
483 	struct got_tree_entry *selected_entry;
484 	int selected;
485 };
486 
487 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
488 
489 struct tog_tree_view_state {
490 	char *tree_label;
491 	struct got_object_id *commit_id;/* commit which this tree belongs to */
492 	struct got_tree_object *root;	/* the commit's root tree entry */
493 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
494 	struct got_tree_entry *first_displayed_entry;
495 	struct got_tree_entry *last_displayed_entry;
496 	struct got_tree_entry *selected_entry;
497 	int ndisplayed, selected, show_ids;
498 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
499 	char *head_ref_name;
500 	struct got_repository *repo;
501 	struct got_tree_entry *matched_entry;
502 	struct tog_colors colors;
503 };
504 
505 struct tog_reflist_entry {
506 	TAILQ_ENTRY(tog_reflist_entry) entry;
507 	struct got_reference *ref;
508 	int idx;
509 };
510 
511 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
512 
513 struct tog_ref_view_state {
514 	struct tog_reflist_head refs;
515 	struct tog_reflist_entry *first_displayed_entry;
516 	struct tog_reflist_entry *last_displayed_entry;
517 	struct tog_reflist_entry *selected_entry;
518 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
519 	struct got_repository *repo;
520 	struct tog_reflist_entry *matched_entry;
521 	struct tog_colors colors;
522 };
523 
524 struct tog_help_view_state {
525 	FILE			*f;
526 	off_t			*line_offsets;
527 	size_t			 nlines;
528 	int			 lineno;
529 	int			 first_displayed_line;
530 	int			 last_displayed_line;
531 	int			 eof;
532 	int			 matched_line;
533 	int			 selected_line;
534 	int			 all;
535 	enum tog_keymap_type	 type;
536 };
537 
538 #define GENERATE_HELP \
539 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
540 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
541 	KEY_("k C-p Up", "Move cursor or page up one line"), \
542 	KEY_("j C-n Down", "Move cursor or page down one line"), \
543 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
544 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
545 	KEY_("C-u u", "Scroll the view up one half page"), \
546 	KEY_("C-d d", "Scroll the view down one half page"), \
547 	KEY_("g", "Go to line N (default: first line)"), \
548 	KEY_("Home =", "Go to the first line"), \
549 	KEY_("G", "Go to line N (default: last line)"), \
550 	KEY_("End *", "Go to the last line"), \
551 	KEY_("l Right", "Scroll the view right"), \
552 	KEY_("h Left", "Scroll the view left"), \
553 	KEY_("$", "Scroll view to the rightmost position"), \
554 	KEY_("0", "Scroll view to the leftmost position"), \
555 	KEY_("-", "Decrease size of the focussed split"), \
556 	KEY_("+", "Increase size of the focussed split"), \
557 	KEY_("Tab", "Switch focus between views"), \
558 	KEY_("F", "Toggle fullscreen mode"), \
559 	KEY_("S", "Switch split-screen layout"), \
560 	KEY_("/", "Open prompt to enter search term"), \
561 	KEY_("n", "Find next line/token matching the current search term"), \
562 	KEY_("N", "Find previous line/token matching the current search term"),\
563 	KEY_("q", "Quit the focussed view; Quit help screen"), \
564 	KEY_("Q", "Quit tog"), \
565 	\
566 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
567 	KEY_("< ,", "Move cursor up one commit"), \
568 	KEY_("> .", "Move cursor down one commit"), \
569 	KEY_("Enter", "Open diff view of the selected commit"), \
570 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
571 	KEY_("R", "Open ref view of all repository references"), \
572 	KEY_("T", "Display tree view of the repository from the selected" \
573 	    " commit"), \
574 	KEY_("@", "Toggle between displaying author and committer name"), \
575 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
576 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
577 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
578 	\
579 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
580 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
581 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
582 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
583 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
584 	    " data"), \
585 	KEY_("(", "Go to the previous file in the diff"), \
586 	KEY_(")", "Go to the next file in the diff"), \
587 	KEY_("{", "Go to the previous hunk in the diff"), \
588 	KEY_("}", "Go to the next hunk in the diff"), \
589 	KEY_("[", "Decrease the number of context lines"), \
590 	KEY_("]", "Increase the number of context lines"), \
591 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
592 	\
593 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
594 	KEY_("Enter", "Display diff view of the selected line's commit"), \
595 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
596 	KEY_("L", "Open log view for the currently selected annotated line"), \
597 	KEY_("C", "Reload view with the previously blamed commit"), \
598 	KEY_("c", "Reload view with the version of the file found in the" \
599 	    " selected line's commit"), \
600 	KEY_("p", "Reload view with the version of the file found in the" \
601 	    " selected line's parent commit"), \
602 	\
603 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
604 	KEY_("Enter", "Enter selected directory or open blame view of the" \
605 	    " selected file"), \
606 	KEY_("L", "Open log view for the selected entry"), \
607 	KEY_("R", "Open ref view of all repository references"), \
608 	KEY_("i", "Show object IDs for all tree entries"), \
609 	KEY_("Backspace", "Return to the parent directory"), \
610 	\
611 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
612 	KEY_("Enter", "Display log view of the selected reference"), \
613 	KEY_("T", "Display tree view of the selected reference"), \
614 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
615 	KEY_("m", "Toggle display of last modified date for each reference"), \
616 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
617 	KEY_("C-l", "Reload view with all repository references")
618 
619 struct tog_key_map {
620 	const char		*keys;
621 	const char		*info;
622 	enum tog_keymap_type	 type;
623 };
624 
625 /* curses io for tog regress */
626 struct tog_io {
627 	FILE	*cin;
628 	FILE	*cout;
629 	FILE	*f;
630 	FILE	*sdump;
631 	int	 wait_for_ui;
632 } tog_io;
633 static int using_mock_io;
634 
635 #define TOG_KEY_SCRDUMP	SHRT_MIN
636 
637 /*
638  * We implement two types of views: parent views and child views.
639  *
640  * The 'Tab' key switches focus between a parent view and its child view.
641  * Child views are shown side-by-side to their parent view, provided
642  * there is enough screen estate.
643  *
644  * When a new view is opened from within a parent view, this new view
645  * becomes a child view of the parent view, replacing any existing child.
646  *
647  * When a new view is opened from within a child view, this new view
648  * becomes a parent view which will obscure the views below until the
649  * user quits the new parent view by typing 'q'.
650  *
651  * This list of views contains parent views only.
652  * Child views are only pointed to by their parent view.
653  */
654 TAILQ_HEAD(tog_view_list_head, tog_view);
655 
656 struct tog_view {
657 	TAILQ_ENTRY(tog_view) entry;
658 	WINDOW *window;
659 	PANEL *panel;
660 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
661 	int resized_y, resized_x; /* begin_y/x based on user resizing */
662 	int maxx, x; /* max column and current start column */
663 	int lines, cols; /* copies of LINES and COLS */
664 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
665 	int gline, hiline; /* navigate to and highlight this nG line */
666 	int ch, count; /* current keymap and count prefix */
667 	int resized; /* set when in a resize event */
668 	int focussed; /* Only set on one parent or child view at a time. */
669 	int dying;
670 	struct tog_view *parent;
671 	struct tog_view *child;
672 
673 	/*
674 	 * This flag is initially set on parent views when a new child view
675 	 * is created. It gets toggled when the 'Tab' key switches focus
676 	 * between parent and child.
677 	 * The flag indicates whether focus should be passed on to our child
678 	 * view if this parent view gets picked for focus after another parent
679 	 * view was closed. This prevents child views from losing focus in such
680 	 * situations.
681 	 */
682 	int focus_child;
683 
684 	enum tog_view_mode mode;
685 	/* type-specific state */
686 	enum tog_view_type type;
687 	union {
688 		struct tog_diff_view_state diff;
689 		struct tog_log_view_state log;
690 		struct tog_blame_view_state blame;
691 		struct tog_tree_view_state tree;
692 		struct tog_ref_view_state ref;
693 		struct tog_help_view_state help;
694 	} state;
695 
696 	const struct got_error *(*show)(struct tog_view *);
697 	const struct got_error *(*input)(struct tog_view **,
698 	    struct tog_view *, int);
699 	const struct got_error *(*reset)(struct tog_view *);
700 	const struct got_error *(*resize)(struct tog_view *, int);
701 	const struct got_error *(*close)(struct tog_view *);
702 
703 	const struct got_error *(*search_start)(struct tog_view *);
704 	const struct got_error *(*search_next)(struct tog_view *);
705 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
706 	    int **, int **, int **, int **);
707 	int search_started;
708 	int searching;
709 #define TOG_SEARCH_FORWARD	1
710 #define TOG_SEARCH_BACKWARD	2
711 	int search_next_done;
712 #define TOG_SEARCH_HAVE_MORE	1
713 #define TOG_SEARCH_NO_MORE	2
714 #define TOG_SEARCH_HAVE_NONE	3
715 	regex_t regex;
716 	regmatch_t regmatch;
717 	const char *action;
718 };
719 
720 static const struct got_error *open_diff_view(struct tog_view *,
721     struct got_object_id *, struct got_object_id *,
722     const char *, const char *, int, int, int, struct tog_view *,
723     struct got_repository *);
724 static const struct got_error *show_diff_view(struct tog_view *);
725 static const struct got_error *input_diff_view(struct tog_view **,
726     struct tog_view *, int);
727 static const struct got_error *reset_diff_view(struct tog_view *);
728 static const struct got_error* close_diff_view(struct tog_view *);
729 static const struct got_error *search_start_diff_view(struct tog_view *);
730 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
731     size_t *, int **, int **, int **, int **);
732 static const struct got_error *search_next_view_match(struct tog_view *);
733 
734 static const struct got_error *open_log_view(struct tog_view *,
735     struct got_object_id *, struct got_repository *,
736     const char *, const char *, int, struct got_worktree *);
737 static const struct got_error * show_log_view(struct tog_view *);
738 static const struct got_error *input_log_view(struct tog_view **,
739     struct tog_view *, int);
740 static const struct got_error *resize_log_view(struct tog_view *, int);
741 static const struct got_error *close_log_view(struct tog_view *);
742 static const struct got_error *search_start_log_view(struct tog_view *);
743 static const struct got_error *search_next_log_view(struct tog_view *);
744 
745 static const struct got_error *open_blame_view(struct tog_view *, char *,
746     struct got_object_id *, struct got_repository *);
747 static const struct got_error *show_blame_view(struct tog_view *);
748 static const struct got_error *input_blame_view(struct tog_view **,
749     struct tog_view *, int);
750 static const struct got_error *reset_blame_view(struct tog_view *);
751 static const struct got_error *close_blame_view(struct tog_view *);
752 static const struct got_error *search_start_blame_view(struct tog_view *);
753 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
754     size_t *, int **, int **, int **, int **);
755 
756 static const struct got_error *open_tree_view(struct tog_view *,
757     struct got_object_id *, const char *, struct got_repository *);
758 static const struct got_error *show_tree_view(struct tog_view *);
759 static const struct got_error *input_tree_view(struct tog_view **,
760     struct tog_view *, int);
761 static const struct got_error *close_tree_view(struct tog_view *);
762 static const struct got_error *search_start_tree_view(struct tog_view *);
763 static const struct got_error *search_next_tree_view(struct tog_view *);
764 
765 static const struct got_error *open_ref_view(struct tog_view *,
766     struct got_repository *);
767 static const struct got_error *show_ref_view(struct tog_view *);
768 static const struct got_error *input_ref_view(struct tog_view **,
769     struct tog_view *, int);
770 static const struct got_error *close_ref_view(struct tog_view *);
771 static const struct got_error *search_start_ref_view(struct tog_view *);
772 static const struct got_error *search_next_ref_view(struct tog_view *);
773 
774 static const struct got_error *open_help_view(struct tog_view *,
775     struct tog_view *);
776 static const struct got_error *show_help_view(struct tog_view *);
777 static const struct got_error *input_help_view(struct tog_view **,
778     struct tog_view *, int);
779 static const struct got_error *reset_help_view(struct tog_view *);
780 static const struct got_error* close_help_view(struct tog_view *);
781 static const struct got_error *search_start_help_view(struct tog_view *);
782 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
783     size_t *, int **, int **, int **, int **);
784 
785 static volatile sig_atomic_t tog_sigwinch_received;
786 static volatile sig_atomic_t tog_sigpipe_received;
787 static volatile sig_atomic_t tog_sigcont_received;
788 static volatile sig_atomic_t tog_sigint_received;
789 static volatile sig_atomic_t tog_sigterm_received;
790 
791 static void
792 tog_sigwinch(int signo)
793 {
794 	tog_sigwinch_received = 1;
795 }
796 
797 static void
798 tog_sigpipe(int signo)
799 {
800 	tog_sigpipe_received = 1;
801 }
802 
803 static void
804 tog_sigcont(int signo)
805 {
806 	tog_sigcont_received = 1;
807 }
808 
809 static void
810 tog_sigint(int signo)
811 {
812 	tog_sigint_received = 1;
813 }
814 
815 static void
816 tog_sigterm(int signo)
817 {
818 	tog_sigterm_received = 1;
819 }
820 
821 static int
822 tog_fatal_signal_received(void)
823 {
824 	return (tog_sigpipe_received ||
825 	    tog_sigint_received || tog_sigterm_received);
826 }
827 
828 static const struct got_error *
829 view_close(struct tog_view *view)
830 {
831 	const struct got_error *err = NULL, *child_err = NULL;
832 
833 	if (view->child) {
834 		child_err = view_close(view->child);
835 		view->child = NULL;
836 	}
837 	if (view->close)
838 		err = view->close(view);
839 	if (view->panel)
840 		del_panel(view->panel);
841 	if (view->window)
842 		delwin(view->window);
843 	free(view);
844 	return err ? err : child_err;
845 }
846 
847 static struct tog_view *
848 view_open(int nlines, int ncols, int begin_y, int begin_x,
849     enum tog_view_type type)
850 {
851 	struct tog_view *view = calloc(1, sizeof(*view));
852 
853 	if (view == NULL)
854 		return NULL;
855 
856 	view->type = type;
857 	view->lines = LINES;
858 	view->cols = COLS;
859 	view->nlines = nlines ? nlines : LINES - begin_y;
860 	view->ncols = ncols ? ncols : COLS - begin_x;
861 	view->begin_y = begin_y;
862 	view->begin_x = begin_x;
863 	view->window = newwin(nlines, ncols, begin_y, begin_x);
864 	if (view->window == NULL) {
865 		view_close(view);
866 		return NULL;
867 	}
868 	view->panel = new_panel(view->window);
869 	if (view->panel == NULL ||
870 	    set_panel_userptr(view->panel, view) != OK) {
871 		view_close(view);
872 		return NULL;
873 	}
874 
875 	keypad(view->window, TRUE);
876 	return view;
877 }
878 
879 static int
880 view_split_begin_x(int begin_x)
881 {
882 	if (begin_x > 0 || COLS < 120)
883 		return 0;
884 	return (COLS - MAX(COLS / 2, 80));
885 }
886 
887 /* XXX Stub till we decide what to do. */
888 static int
889 view_split_begin_y(int lines)
890 {
891 	return lines * HSPLIT_SCALE;
892 }
893 
894 static const struct got_error *view_resize(struct tog_view *);
895 
896 static const struct got_error *
897 view_splitscreen(struct tog_view *view)
898 {
899 	const struct got_error *err = NULL;
900 
901 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
902 		if (view->resized_y && view->resized_y < view->lines)
903 			view->begin_y = view->resized_y;
904 		else
905 			view->begin_y = view_split_begin_y(view->nlines);
906 		view->begin_x = 0;
907 	} else if (!view->resized) {
908 		if (view->resized_x && view->resized_x < view->cols - 1 &&
909 		    view->cols > 119)
910 			view->begin_x = view->resized_x;
911 		else
912 			view->begin_x = view_split_begin_x(0);
913 		view->begin_y = 0;
914 	}
915 	view->nlines = LINES - view->begin_y;
916 	view->ncols = COLS - view->begin_x;
917 	view->lines = LINES;
918 	view->cols = COLS;
919 	err = view_resize(view);
920 	if (err)
921 		return err;
922 
923 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
924 		view->parent->nlines = view->begin_y;
925 
926 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
927 		return got_error_from_errno("mvwin");
928 
929 	return NULL;
930 }
931 
932 static const struct got_error *
933 view_fullscreen(struct tog_view *view)
934 {
935 	const struct got_error *err = NULL;
936 
937 	view->begin_x = 0;
938 	view->begin_y = view->resized ? view->begin_y : 0;
939 	view->nlines = view->resized ? view->nlines : LINES;
940 	view->ncols = COLS;
941 	view->lines = LINES;
942 	view->cols = COLS;
943 	err = view_resize(view);
944 	if (err)
945 		return err;
946 
947 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
948 		return got_error_from_errno("mvwin");
949 
950 	return NULL;
951 }
952 
953 static int
954 view_is_parent_view(struct tog_view *view)
955 {
956 	return view->parent == NULL;
957 }
958 
959 static int
960 view_is_splitscreen(struct tog_view *view)
961 {
962 	return view->begin_x > 0 || view->begin_y > 0;
963 }
964 
965 static int
966 view_is_fullscreen(struct tog_view *view)
967 {
968 	return view->nlines == LINES && view->ncols == COLS;
969 }
970 
971 static int
972 view_is_hsplit_top(struct tog_view *view)
973 {
974 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
975 	    view_is_splitscreen(view->child);
976 }
977 
978 static void
979 view_border(struct tog_view *view)
980 {
981 	PANEL *panel;
982 	const struct tog_view *view_above;
983 
984 	if (view->parent)
985 		return view_border(view->parent);
986 
987 	panel = panel_above(view->panel);
988 	if (panel == NULL)
989 		return;
990 
991 	view_above = panel_userptr(panel);
992 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
993 		mvwhline(view->window, view_above->begin_y - 1,
994 		    view->begin_x, ACS_HLINE, view->ncols);
995 	else
996 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
997 		    ACS_VLINE, view->nlines);
998 }
999 
1000 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1001 static const struct got_error *request_log_commits(struct tog_view *);
1002 static const struct got_error *offset_selection_down(struct tog_view *);
1003 static void offset_selection_up(struct tog_view *);
1004 static void view_get_split(struct tog_view *, int *, int *);
1005 
1006 static const struct got_error *
1007 view_resize(struct tog_view *view)
1008 {
1009 	const struct got_error	*err = NULL;
1010 	int			 dif, nlines, ncols;
1011 
1012 	dif = LINES - view->lines;  /* line difference */
1013 
1014 	if (view->lines > LINES)
1015 		nlines = view->nlines - (view->lines - LINES);
1016 	else
1017 		nlines = view->nlines + (LINES - view->lines);
1018 	if (view->cols > COLS)
1019 		ncols = view->ncols - (view->cols - COLS);
1020 	else
1021 		ncols = view->ncols + (COLS - view->cols);
1022 
1023 	if (view->child) {
1024 		int hs = view->child->begin_y;
1025 
1026 		if (!view_is_fullscreen(view))
1027 			view->child->begin_x = view_split_begin_x(view->begin_x);
1028 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1029 		    view->child->begin_x == 0) {
1030 			ncols = COLS;
1031 
1032 			view_fullscreen(view->child);
1033 			if (view->child->focussed)
1034 				show_panel(view->child->panel);
1035 			else
1036 				show_panel(view->panel);
1037 		} else {
1038 			ncols = view->child->begin_x;
1039 
1040 			view_splitscreen(view->child);
1041 			show_panel(view->child->panel);
1042 		}
1043 		/*
1044 		 * XXX This is ugly and needs to be moved into the above
1045 		 * logic but "works" for now and my attempts at moving it
1046 		 * break either 'tab' or 'F' key maps in horizontal splits.
1047 		 */
1048 		if (hs) {
1049 			err = view_splitscreen(view->child);
1050 			if (err)
1051 				return err;
1052 			if (dif < 0) { /* top split decreased */
1053 				err = offset_selection_down(view);
1054 				if (err)
1055 					return err;
1056 			}
1057 			view_border(view);
1058 			update_panels();
1059 			doupdate();
1060 			show_panel(view->child->panel);
1061 			nlines = view->nlines;
1062 		}
1063 	} else if (view->parent == NULL)
1064 		ncols = COLS;
1065 
1066 	if (view->resize && dif > 0) {
1067 		err = view->resize(view, dif);
1068 		if (err)
1069 			return err;
1070 	}
1071 
1072 	if (wresize(view->window, nlines, ncols) == ERR)
1073 		return got_error_from_errno("wresize");
1074 	if (replace_panel(view->panel, view->window) == ERR)
1075 		return got_error_from_errno("replace_panel");
1076 	wclear(view->window);
1077 
1078 	view->nlines = nlines;
1079 	view->ncols = ncols;
1080 	view->lines = LINES;
1081 	view->cols = COLS;
1082 
1083 	return NULL;
1084 }
1085 
1086 static const struct got_error *
1087 resize_log_view(struct tog_view *view, int increase)
1088 {
1089 	struct tog_log_view_state	*s = &view->state.log;
1090 	const struct got_error		*err = NULL;
1091 	int				 n = 0;
1092 
1093 	if (s->selected_entry)
1094 		n = s->selected_entry->idx + view->lines - s->selected;
1095 
1096 	/*
1097 	 * Request commits to account for the increased
1098 	 * height so we have enough to populate the view.
1099 	 */
1100 	if (s->commits->ncommits < n) {
1101 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1102 		err = request_log_commits(view);
1103 	}
1104 
1105 	return err;
1106 }
1107 
1108 static void
1109 view_adjust_offset(struct tog_view *view, int n)
1110 {
1111 	if (n == 0)
1112 		return;
1113 
1114 	if (view->parent && view->parent->offset) {
1115 		if (view->parent->offset + n >= 0)
1116 			view->parent->offset += n;
1117 		else
1118 			view->parent->offset = 0;
1119 	} else if (view->offset) {
1120 		if (view->offset - n >= 0)
1121 			view->offset -= n;
1122 		else
1123 			view->offset = 0;
1124 	}
1125 }
1126 
1127 static const struct got_error *
1128 view_resize_split(struct tog_view *view, int resize)
1129 {
1130 	const struct got_error	*err = NULL;
1131 	struct tog_view		*v = NULL;
1132 
1133 	if (view->parent)
1134 		v = view->parent;
1135 	else
1136 		v = view;
1137 
1138 	if (!v->child || !view_is_splitscreen(v->child))
1139 		return NULL;
1140 
1141 	v->resized = v->child->resized = resize;  /* lock for resize event */
1142 
1143 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1144 		if (v->child->resized_y)
1145 			v->child->begin_y = v->child->resized_y;
1146 		if (view->parent)
1147 			v->child->begin_y -= resize;
1148 		else
1149 			v->child->begin_y += resize;
1150 		if (v->child->begin_y < 3) {
1151 			view->count = 0;
1152 			v->child->begin_y = 3;
1153 		} else if (v->child->begin_y > LINES - 1) {
1154 			view->count = 0;
1155 			v->child->begin_y = LINES - 1;
1156 		}
1157 		v->ncols = COLS;
1158 		v->child->ncols = COLS;
1159 		view_adjust_offset(view, resize);
1160 		err = view_init_hsplit(v, v->child->begin_y);
1161 		if (err)
1162 			return err;
1163 		v->child->resized_y = v->child->begin_y;
1164 	} else {
1165 		if (v->child->resized_x)
1166 			v->child->begin_x = v->child->resized_x;
1167 		if (view->parent)
1168 			v->child->begin_x -= resize;
1169 		else
1170 			v->child->begin_x += resize;
1171 		if (v->child->begin_x < 11) {
1172 			view->count = 0;
1173 			v->child->begin_x = 11;
1174 		} else if (v->child->begin_x > COLS - 1) {
1175 			view->count = 0;
1176 			v->child->begin_x = COLS - 1;
1177 		}
1178 		v->child->resized_x = v->child->begin_x;
1179 	}
1180 
1181 	v->child->mode = v->mode;
1182 	v->child->nlines = v->lines - v->child->begin_y;
1183 	v->child->ncols = v->cols - v->child->begin_x;
1184 	v->focus_child = 1;
1185 
1186 	err = view_fullscreen(v);
1187 	if (err)
1188 		return err;
1189 	err = view_splitscreen(v->child);
1190 	if (err)
1191 		return err;
1192 
1193 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1194 		err = offset_selection_down(v->child);
1195 		if (err)
1196 			return err;
1197 	}
1198 
1199 	if (v->resize)
1200 		err = v->resize(v, 0);
1201 	else if (v->child->resize)
1202 		err = v->child->resize(v->child, 0);
1203 
1204 	v->resized = v->child->resized = 0;
1205 
1206 	return err;
1207 }
1208 
1209 static void
1210 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1211 {
1212 	struct tog_view *v = src->child ? src->child : src;
1213 
1214 	dst->resized_x = v->resized_x;
1215 	dst->resized_y = v->resized_y;
1216 }
1217 
1218 static const struct got_error *
1219 view_close_child(struct tog_view *view)
1220 {
1221 	const struct got_error *err = NULL;
1222 
1223 	if (view->child == NULL)
1224 		return NULL;
1225 
1226 	err = view_close(view->child);
1227 	view->child = NULL;
1228 	return err;
1229 }
1230 
1231 static const struct got_error *
1232 view_set_child(struct tog_view *view, struct tog_view *child)
1233 {
1234 	const struct got_error *err = NULL;
1235 
1236 	view->child = child;
1237 	child->parent = view;
1238 
1239 	err = view_resize(view);
1240 	if (err)
1241 		return err;
1242 
1243 	if (view->child->resized_x || view->child->resized_y)
1244 		err = view_resize_split(view, 0);
1245 
1246 	return err;
1247 }
1248 
1249 static const struct got_error *view_dispatch_request(struct tog_view **,
1250     struct tog_view *, enum tog_view_type, int, int);
1251 
1252 static const struct got_error *
1253 view_request_new(struct tog_view **requested, struct tog_view *view,
1254     enum tog_view_type request)
1255 {
1256 	struct tog_view		*new_view = NULL;
1257 	const struct got_error	*err;
1258 	int			 y = 0, x = 0;
1259 
1260 	*requested = NULL;
1261 
1262 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1263 		view_get_split(view, &y, &x);
1264 
1265 	err = view_dispatch_request(&new_view, view, request, y, x);
1266 	if (err)
1267 		return err;
1268 
1269 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1270 	    request != TOG_VIEW_HELP) {
1271 		err = view_init_hsplit(view, y);
1272 		if (err)
1273 			return err;
1274 	}
1275 
1276 	view->focussed = 0;
1277 	new_view->focussed = 1;
1278 	new_view->mode = view->mode;
1279 	new_view->nlines = request == TOG_VIEW_HELP ?
1280 	    view->lines : view->lines - y;
1281 
1282 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1283 		view_transfer_size(new_view, view);
1284 		err = view_close_child(view);
1285 		if (err)
1286 			return err;
1287 		err = view_set_child(view, new_view);
1288 		if (err)
1289 			return err;
1290 		view->focus_child = 1;
1291 	} else
1292 		*requested = new_view;
1293 
1294 	return NULL;
1295 }
1296 
1297 static void
1298 tog_resizeterm(void)
1299 {
1300 	int cols, lines;
1301 	struct winsize size;
1302 
1303 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1304 		cols = 80;     /* Default */
1305 		lines = 24;
1306 	} else {
1307 		cols = size.ws_col;
1308 		lines = size.ws_row;
1309 	}
1310 	resize_term(lines, cols);
1311 }
1312 
1313 static const struct got_error *
1314 view_search_start(struct tog_view *view, int fast_refresh)
1315 {
1316 	const struct got_error *err = NULL;
1317 	struct tog_view *v = view;
1318 	char pattern[1024];
1319 	int ret;
1320 
1321 	if (view->search_started) {
1322 		regfree(&view->regex);
1323 		view->searching = 0;
1324 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1325 	}
1326 	view->search_started = 0;
1327 
1328 	if (view->nlines < 1)
1329 		return NULL;
1330 
1331 	if (view_is_hsplit_top(view))
1332 		v = view->child;
1333 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1334 		v = view->parent;
1335 
1336 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1337 	wclrtoeol(v->window);
1338 
1339 	nodelay(v->window, FALSE);  /* block for search term input */
1340 	nocbreak();
1341 	echo();
1342 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1343 	wrefresh(v->window);
1344 	cbreak();
1345 	noecho();
1346 	nodelay(v->window, TRUE);
1347 	if (!fast_refresh && !using_mock_io)
1348 		halfdelay(10);
1349 	if (ret == ERR)
1350 		return NULL;
1351 
1352 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1353 		err = view->search_start(view);
1354 		if (err) {
1355 			regfree(&view->regex);
1356 			return err;
1357 		}
1358 		view->search_started = 1;
1359 		view->searching = TOG_SEARCH_FORWARD;
1360 		view->search_next_done = 0;
1361 		view->search_next(view);
1362 	}
1363 
1364 	return NULL;
1365 }
1366 
1367 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1368 static const struct got_error *
1369 switch_split(struct tog_view *view)
1370 {
1371 	const struct got_error	*err = NULL;
1372 	struct tog_view		*v = NULL;
1373 
1374 	if (view->parent)
1375 		v = view->parent;
1376 	else
1377 		v = view;
1378 
1379 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1380 		v->mode = TOG_VIEW_SPLIT_VERT;
1381 	else
1382 		v->mode = TOG_VIEW_SPLIT_HRZN;
1383 
1384 	if (!v->child)
1385 		return NULL;
1386 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1387 		v->mode = TOG_VIEW_SPLIT_NONE;
1388 
1389 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1390 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1391 		v->child->begin_y = v->child->resized_y;
1392 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1393 		v->child->begin_x = v->child->resized_x;
1394 
1395 
1396 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1397 		v->ncols = COLS;
1398 		v->child->ncols = COLS;
1399 		v->child->nscrolled = LINES - v->child->nlines;
1400 
1401 		err = view_init_hsplit(v, v->child->begin_y);
1402 		if (err)
1403 			return err;
1404 	}
1405 	v->child->mode = v->mode;
1406 	v->child->nlines = v->lines - v->child->begin_y;
1407 	v->focus_child = 1;
1408 
1409 	err = view_fullscreen(v);
1410 	if (err)
1411 		return err;
1412 	err = view_splitscreen(v->child);
1413 	if (err)
1414 		return err;
1415 
1416 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1417 		v->mode = TOG_VIEW_SPLIT_VERT;
1418 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1419 		err = offset_selection_down(v);
1420 		if (err)
1421 			return err;
1422 		err = offset_selection_down(v->child);
1423 		if (err)
1424 			return err;
1425 	} else {
1426 		offset_selection_up(v);
1427 		offset_selection_up(v->child);
1428 	}
1429 	if (v->resize)
1430 		err = v->resize(v, 0);
1431 	else if (v->child->resize)
1432 		err = v->child->resize(v->child, 0);
1433 
1434 	return err;
1435 }
1436 
1437 /*
1438  * Strip trailing whitespace from str starting at byte *n;
1439  * if *n < 0, use strlen(str). Return new str length in *n.
1440  */
1441 static void
1442 strip_trailing_ws(char *str, int *n)
1443 {
1444 	size_t x = *n;
1445 
1446 	if (str == NULL || *str == '\0')
1447 		return;
1448 
1449 	if (x < 0)
1450 		x = strlen(str);
1451 
1452 	while (x-- > 0 && isspace((unsigned char)str[x]))
1453 		str[x] = '\0';
1454 
1455 	*n = x + 1;
1456 }
1457 
1458 /*
1459  * Extract visible substring of line y from the curses screen
1460  * and strip trailing whitespace. If vline is set, overwrite
1461  * line[vline] with '|' because the ACS_VLINE character is
1462  * written out as 'x'. Write the line to file f.
1463  */
1464 static const struct got_error *
1465 view_write_line(FILE *f, int y, int vline)
1466 {
1467 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1468 	int	r, w;
1469 
1470 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1471 	if (r == ERR)
1472 		return got_error_fmt(GOT_ERR_RANGE,
1473 		    "failed to extract line %d", y);
1474 
1475 	/*
1476 	 * In some views, lines are padded with blanks to COLS width.
1477 	 * Strip them so we can diff without the -b flag when testing.
1478 	 */
1479 	strip_trailing_ws(line, &r);
1480 
1481 	if (vline > 0)
1482 		line[vline] = '|';
1483 
1484 	w = fprintf(f, "%s\n", line);
1485 	if (w != r + 1)		/* \n */
1486 		return got_ferror(f, GOT_ERR_IO);
1487 
1488 	return NULL;
1489 }
1490 
1491 /*
1492  * Capture the visible curses screen by writing each line to the
1493  * file at the path set via the TOG_SCR_DUMP environment variable.
1494  */
1495 static const struct got_error *
1496 screendump(struct tog_view *view)
1497 {
1498 	const struct got_error	*err;
1499 	int			 i;
1500 
1501 	err = got_opentemp_truncate(tog_io.sdump);
1502 	if (err)
1503 		return err;
1504 
1505 	if ((view->child && view->child->begin_x) ||
1506 	    (view->parent && view->begin_x)) {
1507 		int ncols = view->child ? view->ncols : view->parent->ncols;
1508 
1509 		/* vertical splitscreen */
1510 		for (i = 0; i < view->nlines; ++i) {
1511 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1512 			if (err)
1513 				goto done;
1514 		}
1515 	} else {
1516 		int hline = 0;
1517 
1518 		/* fullscreen or horizontal splitscreen */
1519 		if ((view->child && view->child->begin_y) ||
1520 		    (view->parent && view->begin_y))	/* hsplit */
1521 			hline = view->child ?
1522 			    view->child->begin_y : view->begin_y;
1523 
1524 		for (i = 0; i < view->lines; i++) {
1525 			if (hline && i == hline - 1) {
1526 				int c;
1527 
1528 				/* ACS_HLINE writes out as 'q', overwrite it */
1529 				for (c = 0; c < view->cols; ++c)
1530 					fputc('-', tog_io.sdump);
1531 				fputc('\n', tog_io.sdump);
1532 				continue;
1533 			}
1534 
1535 			err = view_write_line(tog_io.sdump, i, 0);
1536 			if (err)
1537 				goto done;
1538 		}
1539 	}
1540 
1541 done:
1542 	return err;
1543 }
1544 
1545 /*
1546  * Compute view->count from numeric input. Assign total to view->count and
1547  * return first non-numeric key entered.
1548  */
1549 static int
1550 get_compound_key(struct tog_view *view, int c)
1551 {
1552 	struct tog_view	*v = view;
1553 	int		 x, n = 0;
1554 
1555 	if (view_is_hsplit_top(view))
1556 		v = view->child;
1557 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1558 		v = view->parent;
1559 
1560 	view->count = 0;
1561 	cbreak();  /* block for input */
1562 	nodelay(view->window, FALSE);
1563 	wmove(v->window, v->nlines - 1, 0);
1564 	wclrtoeol(v->window);
1565 	waddch(v->window, ':');
1566 
1567 	do {
1568 		x = getcurx(v->window);
1569 		if (x != ERR && x < view->ncols) {
1570 			waddch(v->window, c);
1571 			wrefresh(v->window);
1572 		}
1573 
1574 		/*
1575 		 * Don't overflow. Max valid request should be the greatest
1576 		 * between the longest and total lines; cap at 10 million.
1577 		 */
1578 		if (n >= 9999999)
1579 			n = 9999999;
1580 		else
1581 			n = n * 10 + (c - '0');
1582 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1583 
1584 	if (c == 'G' || c == 'g') {	/* nG key map */
1585 		view->gline = view->hiline = n;
1586 		n = 0;
1587 		c = 0;
1588 	}
1589 
1590 	/* Massage excessive or inapplicable values at the input handler. */
1591 	view->count = n;
1592 
1593 	return c;
1594 }
1595 
1596 static void
1597 action_report(struct tog_view *view)
1598 {
1599 	struct tog_view *v = view;
1600 
1601 	if (view_is_hsplit_top(view))
1602 		v = view->child;
1603 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1604 		v = view->parent;
1605 
1606 	wmove(v->window, v->nlines - 1, 0);
1607 	wclrtoeol(v->window);
1608 	wprintw(v->window, ":%s", view->action);
1609 	wrefresh(v->window);
1610 
1611 	/*
1612 	 * Clear action status report. Only clear in blame view
1613 	 * once annotating is complete, otherwise it's too fast.
1614 	 */
1615 	if (view->type == TOG_VIEW_BLAME) {
1616 		if (view->state.blame.blame_complete)
1617 			view->action = NULL;
1618 	} else
1619 		view->action = NULL;
1620 }
1621 
1622 /*
1623  * Read the next line from the test script and assign
1624  * key instruction to *ch. If at EOF, set the *done flag.
1625  */
1626 static const struct got_error *
1627 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1628 {
1629 	const struct got_error	*err = NULL;
1630 	char			*line = NULL;
1631 	size_t			 linesz = 0;
1632 
1633 	if (view->count && --view->count) {
1634 		*ch = view->ch;
1635 		return NULL;
1636 	} else
1637 		*ch = -1;
1638 
1639 	if (getline(&line, &linesz, script) == -1) {
1640 		if (feof(script)) {
1641 			*done = 1;
1642 			goto done;
1643 		} else {
1644 			err = got_ferror(script, GOT_ERR_IO);
1645 			goto done;
1646 		}
1647 	}
1648 
1649 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1650 		tog_io.wait_for_ui = 1;
1651 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1652 		*ch = KEY_ENTER;
1653 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1654 		*ch = KEY_RIGHT;
1655 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1656 		*ch = KEY_LEFT;
1657 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1658 		*ch = KEY_DOWN;
1659 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1660 		*ch = KEY_UP;
1661 	else if (strncasecmp(line, "TAB", 3) == 0)
1662 		*ch = '\t';
1663 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1664 		*ch = TOG_KEY_SCRDUMP;
1665 	else if (isdigit((unsigned char)*line)) {
1666 		char *t = line;
1667 
1668 		while (isdigit((unsigned char)*t))
1669 			++t;
1670 		view->ch = *ch = *t;
1671 		*t = '\0';
1672 		/* ignore error, view->count is 0 if instruction is invalid */
1673 		view->count = strtonum(line, 0, INT_MAX, NULL);
1674 	} else
1675 		*ch = *line;
1676 
1677 done:
1678 	free(line);
1679 	return err;
1680 }
1681 
1682 static const struct got_error *
1683 view_input(struct tog_view **new, int *done, struct tog_view *view,
1684     struct tog_view_list_head *views, int fast_refresh)
1685 {
1686 	const struct got_error *err = NULL;
1687 	struct tog_view *v;
1688 	int ch, errcode;
1689 
1690 	*new = NULL;
1691 
1692 	if (view->action)
1693 		action_report(view);
1694 
1695 	/* Clear "no matches" indicator. */
1696 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1697 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1698 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1699 		view->count = 0;
1700 	}
1701 
1702 	if (view->searching && !view->search_next_done) {
1703 		errcode = pthread_mutex_unlock(&tog_mutex);
1704 		if (errcode)
1705 			return got_error_set_errno(errcode,
1706 			    "pthread_mutex_unlock");
1707 		sched_yield();
1708 		errcode = pthread_mutex_lock(&tog_mutex);
1709 		if (errcode)
1710 			return got_error_set_errno(errcode,
1711 			    "pthread_mutex_lock");
1712 		view->search_next(view);
1713 		return NULL;
1714 	}
1715 
1716 	/* Allow threads to make progress while we are waiting for input. */
1717 	errcode = pthread_mutex_unlock(&tog_mutex);
1718 	if (errcode)
1719 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1720 
1721 	if (using_mock_io) {
1722 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1723 		if (err) {
1724 			errcode = pthread_mutex_lock(&tog_mutex);
1725 			return err;
1726 		}
1727 	} else if (view->count && --view->count) {
1728 		cbreak();
1729 		nodelay(view->window, TRUE);
1730 		ch = wgetch(view->window);
1731 		/* let C-g or backspace abort unfinished count */
1732 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1733 			view->count = 0;
1734 		else
1735 			ch = view->ch;
1736 	} else {
1737 		ch = wgetch(view->window);
1738 		if (ch >= '1' && ch  <= '9')
1739 			view->ch = ch = get_compound_key(view, ch);
1740 	}
1741 	if (view->hiline && ch != ERR && ch != 0)
1742 		view->hiline = 0;  /* key pressed, clear line highlight */
1743 	nodelay(view->window, TRUE);
1744 	errcode = pthread_mutex_lock(&tog_mutex);
1745 	if (errcode)
1746 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1747 
1748 	if (tog_sigwinch_received || tog_sigcont_received) {
1749 		tog_resizeterm();
1750 		tog_sigwinch_received = 0;
1751 		tog_sigcont_received = 0;
1752 		TAILQ_FOREACH(v, views, entry) {
1753 			err = view_resize(v);
1754 			if (err)
1755 				return err;
1756 			err = v->input(new, v, KEY_RESIZE);
1757 			if (err)
1758 				return err;
1759 			if (v->child) {
1760 				err = view_resize(v->child);
1761 				if (err)
1762 					return err;
1763 				err = v->child->input(new, v->child,
1764 				    KEY_RESIZE);
1765 				if (err)
1766 					return err;
1767 				if (v->child->resized_x || v->child->resized_y) {
1768 					err = view_resize_split(v, 0);
1769 					if (err)
1770 						return err;
1771 				}
1772 			}
1773 		}
1774 	}
1775 
1776 	switch (ch) {
1777 	case '?':
1778 	case 'H':
1779 	case KEY_F(1):
1780 		if (view->type == TOG_VIEW_HELP)
1781 			err = view->reset(view);
1782 		else
1783 			err = view_request_new(new, view, TOG_VIEW_HELP);
1784 		break;
1785 	case '\t':
1786 		view->count = 0;
1787 		if (view->child) {
1788 			view->focussed = 0;
1789 			view->child->focussed = 1;
1790 			view->focus_child = 1;
1791 		} else if (view->parent) {
1792 			view->focussed = 0;
1793 			view->parent->focussed = 1;
1794 			view->parent->focus_child = 0;
1795 			if (!view_is_splitscreen(view)) {
1796 				if (view->parent->resize) {
1797 					err = view->parent->resize(view->parent,
1798 					    0);
1799 					if (err)
1800 						return err;
1801 				}
1802 				offset_selection_up(view->parent);
1803 				err = view_fullscreen(view->parent);
1804 				if (err)
1805 					return err;
1806 			}
1807 		}
1808 		break;
1809 	case 'q':
1810 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1811 			if (view->parent->resize) {
1812 				/* might need more commits to fill fullscreen */
1813 				err = view->parent->resize(view->parent, 0);
1814 				if (err)
1815 					break;
1816 			}
1817 			offset_selection_up(view->parent);
1818 		}
1819 		err = view->input(new, view, ch);
1820 		view->dying = 1;
1821 		break;
1822 	case 'Q':
1823 		*done = 1;
1824 		break;
1825 	case 'F':
1826 		view->count = 0;
1827 		if (view_is_parent_view(view)) {
1828 			if (view->child == NULL)
1829 				break;
1830 			if (view_is_splitscreen(view->child)) {
1831 				view->focussed = 0;
1832 				view->child->focussed = 1;
1833 				err = view_fullscreen(view->child);
1834 			} else {
1835 				err = view_splitscreen(view->child);
1836 				if (!err)
1837 					err = view_resize_split(view, 0);
1838 			}
1839 			if (err)
1840 				break;
1841 			err = view->child->input(new, view->child,
1842 			    KEY_RESIZE);
1843 		} else {
1844 			if (view_is_splitscreen(view)) {
1845 				view->parent->focussed = 0;
1846 				view->focussed = 1;
1847 				err = view_fullscreen(view);
1848 			} else {
1849 				err = view_splitscreen(view);
1850 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1851 					err = view_resize(view->parent);
1852 				if (!err)
1853 					err = view_resize_split(view, 0);
1854 			}
1855 			if (err)
1856 				break;
1857 			err = view->input(new, view, KEY_RESIZE);
1858 		}
1859 		if (err)
1860 			break;
1861 		if (view->resize) {
1862 			err = view->resize(view, 0);
1863 			if (err)
1864 				break;
1865 		}
1866 		if (view->parent) {
1867 			if (view->parent->resize) {
1868 				err = view->parent->resize(view->parent, 0);
1869 				if (err != NULL)
1870 					break;
1871 			}
1872 			err = offset_selection_down(view->parent);
1873 			if (err != NULL)
1874 				break;
1875 		}
1876 		err = offset_selection_down(view);
1877 		break;
1878 	case 'S':
1879 		view->count = 0;
1880 		err = switch_split(view);
1881 		break;
1882 	case '-':
1883 		err = view_resize_split(view, -1);
1884 		break;
1885 	case '+':
1886 		err = view_resize_split(view, 1);
1887 		break;
1888 	case KEY_RESIZE:
1889 		break;
1890 	case '/':
1891 		view->count = 0;
1892 		if (view->search_start)
1893 			view_search_start(view, fast_refresh);
1894 		else
1895 			err = view->input(new, view, ch);
1896 		break;
1897 	case 'N':
1898 	case 'n':
1899 		if (view->search_started && view->search_next) {
1900 			view->searching = (ch == 'n' ?
1901 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1902 			view->search_next_done = 0;
1903 			view->search_next(view);
1904 		} else
1905 			err = view->input(new, view, ch);
1906 		break;
1907 	case 'A':
1908 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1909 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1910 			view->action = "Patience diff algorithm";
1911 		} else {
1912 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1913 			view->action = "Myers diff algorithm";
1914 		}
1915 		TAILQ_FOREACH(v, views, entry) {
1916 			if (v->reset) {
1917 				err = v->reset(v);
1918 				if (err)
1919 					return err;
1920 			}
1921 			if (v->child && v->child->reset) {
1922 				err = v->child->reset(v->child);
1923 				if (err)
1924 					return err;
1925 			}
1926 		}
1927 		break;
1928 	case TOG_KEY_SCRDUMP:
1929 		err = screendump(view);
1930 		break;
1931 	default:
1932 		err = view->input(new, view, ch);
1933 		break;
1934 	}
1935 
1936 	return err;
1937 }
1938 
1939 static int
1940 view_needs_focus_indication(struct tog_view *view)
1941 {
1942 	if (view_is_parent_view(view)) {
1943 		if (view->child == NULL || view->child->focussed)
1944 			return 0;
1945 		if (!view_is_splitscreen(view->child))
1946 			return 0;
1947 	} else if (!view_is_splitscreen(view))
1948 		return 0;
1949 
1950 	return view->focussed;
1951 }
1952 
1953 static const struct got_error *
1954 tog_io_close(void)
1955 {
1956 	const struct got_error *err = NULL;
1957 
1958 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1959 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1960 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1961 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1962 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1963 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1964 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1965 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1966 
1967 	return err;
1968 }
1969 
1970 static const struct got_error *
1971 view_loop(struct tog_view *view)
1972 {
1973 	const struct got_error *err = NULL;
1974 	struct tog_view_list_head views;
1975 	struct tog_view *new_view;
1976 	char *mode;
1977 	int fast_refresh = 10;
1978 	int done = 0, errcode;
1979 
1980 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1981 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1982 		view->mode = TOG_VIEW_SPLIT_VERT;
1983 	else
1984 		view->mode = TOG_VIEW_SPLIT_HRZN;
1985 
1986 	errcode = pthread_mutex_lock(&tog_mutex);
1987 	if (errcode)
1988 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1989 
1990 	TAILQ_INIT(&views);
1991 	TAILQ_INSERT_HEAD(&views, view, entry);
1992 
1993 	view->focussed = 1;
1994 	err = view->show(view);
1995 	if (err)
1996 		return err;
1997 	update_panels();
1998 	doupdate();
1999 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2000 	    !tog_fatal_signal_received()) {
2001 		/* Refresh fast during initialization, then become slower. */
2002 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2003 			halfdelay(10); /* switch to once per second */
2004 
2005 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2006 		if (err)
2007 			break;
2008 
2009 		if (view->dying && view == TAILQ_FIRST(&views) &&
2010 		    TAILQ_NEXT(view, entry) == NULL)
2011 			done = 1;
2012 		if (done) {
2013 			struct tog_view *v;
2014 
2015 			/*
2016 			 * When we quit, scroll the screen up a single line
2017 			 * so we don't lose any information.
2018 			 */
2019 			TAILQ_FOREACH(v, &views, entry) {
2020 				wmove(v->window, 0, 0);
2021 				wdeleteln(v->window);
2022 				wnoutrefresh(v->window);
2023 				if (v->child && !view_is_fullscreen(v)) {
2024 					wmove(v->child->window, 0, 0);
2025 					wdeleteln(v->child->window);
2026 					wnoutrefresh(v->child->window);
2027 				}
2028 			}
2029 			doupdate();
2030 		}
2031 
2032 		if (view->dying) {
2033 			struct tog_view *v, *prev = NULL;
2034 
2035 			if (view_is_parent_view(view))
2036 				prev = TAILQ_PREV(view, tog_view_list_head,
2037 				    entry);
2038 			else if (view->parent)
2039 				prev = view->parent;
2040 
2041 			if (view->parent) {
2042 				view->parent->child = NULL;
2043 				view->parent->focus_child = 0;
2044 				/* Restore fullscreen line height. */
2045 				view->parent->nlines = view->parent->lines;
2046 				err = view_resize(view->parent);
2047 				if (err)
2048 					break;
2049 				/* Make resized splits persist. */
2050 				view_transfer_size(view->parent, view);
2051 			} else
2052 				TAILQ_REMOVE(&views, view, entry);
2053 
2054 			err = view_close(view);
2055 			if (err)
2056 				goto done;
2057 
2058 			view = NULL;
2059 			TAILQ_FOREACH(v, &views, entry) {
2060 				if (v->focussed)
2061 					break;
2062 			}
2063 			if (view == NULL && new_view == NULL) {
2064 				/* No view has focus. Try to pick one. */
2065 				if (prev)
2066 					view = prev;
2067 				else if (!TAILQ_EMPTY(&views)) {
2068 					view = TAILQ_LAST(&views,
2069 					    tog_view_list_head);
2070 				}
2071 				if (view) {
2072 					if (view->focus_child) {
2073 						view->child->focussed = 1;
2074 						view = view->child;
2075 					} else
2076 						view->focussed = 1;
2077 				}
2078 			}
2079 		}
2080 		if (new_view) {
2081 			struct tog_view *v, *t;
2082 			/* Only allow one parent view per type. */
2083 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2084 				if (v->type != new_view->type)
2085 					continue;
2086 				TAILQ_REMOVE(&views, v, entry);
2087 				err = view_close(v);
2088 				if (err)
2089 					goto done;
2090 				break;
2091 			}
2092 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2093 			view = new_view;
2094 		}
2095 		if (view && !done) {
2096 			if (view_is_parent_view(view)) {
2097 				if (view->child && view->child->focussed)
2098 					view = view->child;
2099 			} else {
2100 				if (view->parent && view->parent->focussed)
2101 					view = view->parent;
2102 			}
2103 			show_panel(view->panel);
2104 			if (view->child && view_is_splitscreen(view->child))
2105 				show_panel(view->child->panel);
2106 			if (view->parent && view_is_splitscreen(view)) {
2107 				err = view->parent->show(view->parent);
2108 				if (err)
2109 					goto done;
2110 			}
2111 			err = view->show(view);
2112 			if (err)
2113 				goto done;
2114 			if (view->child) {
2115 				err = view->child->show(view->child);
2116 				if (err)
2117 					goto done;
2118 			}
2119 			update_panels();
2120 			doupdate();
2121 		}
2122 	}
2123 done:
2124 	while (!TAILQ_EMPTY(&views)) {
2125 		const struct got_error *close_err;
2126 		view = TAILQ_FIRST(&views);
2127 		TAILQ_REMOVE(&views, view, entry);
2128 		close_err = view_close(view);
2129 		if (close_err && err == NULL)
2130 			err = close_err;
2131 	}
2132 
2133 	errcode = pthread_mutex_unlock(&tog_mutex);
2134 	if (errcode && err == NULL)
2135 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2136 
2137 	return err;
2138 }
2139 
2140 __dead static void
2141 usage_log(void)
2142 {
2143 	endwin();
2144 	fprintf(stderr,
2145 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2146 	    getprogname());
2147 	exit(1);
2148 }
2149 
2150 /* Create newly allocated wide-character string equivalent to a byte string. */
2151 static const struct got_error *
2152 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2153 {
2154 	char *vis = NULL;
2155 	const struct got_error *err = NULL;
2156 
2157 	*ws = NULL;
2158 	*wlen = mbstowcs(NULL, s, 0);
2159 	if (*wlen == (size_t)-1) {
2160 		int vislen;
2161 		if (errno != EILSEQ)
2162 			return got_error_from_errno("mbstowcs");
2163 
2164 		/* byte string invalid in current encoding; try to "fix" it */
2165 		err = got_mbsavis(&vis, &vislen, s);
2166 		if (err)
2167 			return err;
2168 		*wlen = mbstowcs(NULL, vis, 0);
2169 		if (*wlen == (size_t)-1) {
2170 			err = got_error_from_errno("mbstowcs"); /* give up */
2171 			goto done;
2172 		}
2173 	}
2174 
2175 	*ws = calloc(*wlen + 1, sizeof(**ws));
2176 	if (*ws == NULL) {
2177 		err = got_error_from_errno("calloc");
2178 		goto done;
2179 	}
2180 
2181 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2182 		err = got_error_from_errno("mbstowcs");
2183 done:
2184 	free(vis);
2185 	if (err) {
2186 		free(*ws);
2187 		*ws = NULL;
2188 		*wlen = 0;
2189 	}
2190 	return err;
2191 }
2192 
2193 static const struct got_error *
2194 expand_tab(char **ptr, const char *src)
2195 {
2196 	char	*dst;
2197 	size_t	 len, n, idx = 0, sz = 0;
2198 
2199 	*ptr = NULL;
2200 	n = len = strlen(src);
2201 	dst = malloc(n + 1);
2202 	if (dst == NULL)
2203 		return got_error_from_errno("malloc");
2204 
2205 	while (idx < len && src[idx]) {
2206 		const char c = src[idx];
2207 
2208 		if (c == '\t') {
2209 			size_t nb = TABSIZE - sz % TABSIZE;
2210 			char *p;
2211 
2212 			p = realloc(dst, n + nb);
2213 			if (p == NULL) {
2214 				free(dst);
2215 				return got_error_from_errno("realloc");
2216 
2217 			}
2218 			dst = p;
2219 			n += nb;
2220 			memset(dst + sz, ' ', nb);
2221 			sz += nb;
2222 		} else
2223 			dst[sz++] = src[idx];
2224 		++idx;
2225 	}
2226 
2227 	dst[sz] = '\0';
2228 	*ptr = dst;
2229 	return NULL;
2230 }
2231 
2232 /*
2233  * Advance at most n columns from wline starting at offset off.
2234  * Return the index to the first character after the span operation.
2235  * Return the combined column width of all spanned wide characters in
2236  * *rcol.
2237  */
2238 static int
2239 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2240 {
2241 	int width, i, cols = 0;
2242 
2243 	if (n == 0) {
2244 		*rcol = cols;
2245 		return off;
2246 	}
2247 
2248 	for (i = off; wline[i] != L'\0'; ++i) {
2249 		if (wline[i] == L'\t')
2250 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2251 		else
2252 			width = wcwidth(wline[i]);
2253 
2254 		if (width == -1) {
2255 			width = 1;
2256 			wline[i] = L'.';
2257 		}
2258 
2259 		if (cols + width > n)
2260 			break;
2261 		cols += width;
2262 	}
2263 
2264 	*rcol = cols;
2265 	return i;
2266 }
2267 
2268 /*
2269  * Format a line for display, ensuring that it won't overflow a width limit.
2270  * With scrolling, the width returned refers to the scrolled version of the
2271  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2272  */
2273 static const struct got_error *
2274 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2275     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2276 {
2277 	const struct got_error *err = NULL;
2278 	int cols;
2279 	wchar_t *wline = NULL;
2280 	char *exstr = NULL;
2281 	size_t wlen;
2282 	int i, scrollx;
2283 
2284 	*wlinep = NULL;
2285 	*widthp = 0;
2286 
2287 	if (expand) {
2288 		err = expand_tab(&exstr, line);
2289 		if (err)
2290 			return err;
2291 	}
2292 
2293 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2294 	free(exstr);
2295 	if (err)
2296 		return err;
2297 
2298 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2299 
2300 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2301 		wline[wlen - 1] = L'\0';
2302 		wlen--;
2303 	}
2304 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2305 		wline[wlen - 1] = L'\0';
2306 		wlen--;
2307 	}
2308 
2309 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2310 	wline[i] = L'\0';
2311 
2312 	if (widthp)
2313 		*widthp = cols;
2314 	if (scrollxp)
2315 		*scrollxp = scrollx;
2316 	if (err)
2317 		free(wline);
2318 	else
2319 		*wlinep = wline;
2320 	return err;
2321 }
2322 
2323 static const struct got_error*
2324 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2325     struct got_object_id *id, struct got_repository *repo)
2326 {
2327 	static const struct got_error *err = NULL;
2328 	struct got_reflist_entry *re;
2329 	char *s;
2330 	const char *name;
2331 
2332 	*refs_str = NULL;
2333 
2334 	if (refs == NULL)
2335 		return NULL;
2336 
2337 	TAILQ_FOREACH(re, refs, entry) {
2338 		struct got_tag_object *tag = NULL;
2339 		struct got_object_id *ref_id;
2340 		int cmp;
2341 
2342 		name = got_ref_get_name(re->ref);
2343 		if (strcmp(name, GOT_REF_HEAD) == 0)
2344 			continue;
2345 		if (strncmp(name, "refs/", 5) == 0)
2346 			name += 5;
2347 		if (strncmp(name, "got/", 4) == 0)
2348 			continue;
2349 		if (strncmp(name, "heads/", 6) == 0)
2350 			name += 6;
2351 		if (strncmp(name, "remotes/", 8) == 0) {
2352 			name += 8;
2353 			s = strstr(name, "/" GOT_REF_HEAD);
2354 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2355 				continue;
2356 		}
2357 		err = got_ref_resolve(&ref_id, repo, re->ref);
2358 		if (err)
2359 			break;
2360 		if (strncmp(name, "tags/", 5) == 0) {
2361 			err = got_object_open_as_tag(&tag, repo, ref_id);
2362 			if (err) {
2363 				if (err->code != GOT_ERR_OBJ_TYPE) {
2364 					free(ref_id);
2365 					break;
2366 				}
2367 				/* Ref points at something other than a tag. */
2368 				err = NULL;
2369 				tag = NULL;
2370 			}
2371 		}
2372 		cmp = got_object_id_cmp(tag ?
2373 		    got_object_tag_get_object_id(tag) : ref_id, id);
2374 		free(ref_id);
2375 		if (tag)
2376 			got_object_tag_close(tag);
2377 		if (cmp != 0)
2378 			continue;
2379 		s = *refs_str;
2380 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2381 		    s ? ", " : "", name) == -1) {
2382 			err = got_error_from_errno("asprintf");
2383 			free(s);
2384 			*refs_str = NULL;
2385 			break;
2386 		}
2387 		free(s);
2388 	}
2389 
2390 	return err;
2391 }
2392 
2393 static const struct got_error *
2394 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2395     int col_tab_align)
2396 {
2397 	char *smallerthan;
2398 
2399 	smallerthan = strchr(author, '<');
2400 	if (smallerthan && smallerthan[1] != '\0')
2401 		author = smallerthan + 1;
2402 	author[strcspn(author, "@>")] = '\0';
2403 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2404 	    col_tab_align, 0);
2405 }
2406 
2407 static const struct got_error *
2408 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2409     const size_t date_display_cols, int author_display_cols)
2410 {
2411 	struct tog_log_view_state *s = &view->state.log;
2412 	const struct got_error *err = NULL;
2413 	struct got_commit_object *commit = entry->commit;
2414 	struct got_object_id *id = entry->id;
2415 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2416 	char *refs_str = NULL;
2417 	char *logmsg0 = NULL, *logmsg = NULL;
2418 	char *author = NULL;
2419 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2420 	int author_width, refstr_width, logmsg_width;
2421 	char *newline, *line = NULL;
2422 	int col, limit, scrollx, logmsg_x;
2423 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2424 	struct tm tm;
2425 	time_t committer_time;
2426 	struct tog_color *tc;
2427 	struct got_reflist_head *refs;
2428 
2429 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2430 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2431 		tog_base_commit.idx = entry->idx;
2432 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2433 		int rc;
2434 
2435 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2436 		if (rc)
2437 			return got_error_set_errno(rc, "pthread_cond_wait");
2438 	}
2439 
2440 	committer_time = got_object_commit_get_committer_time(commit);
2441 	if (gmtime_r(&committer_time, &tm) == NULL)
2442 		return got_error_from_errno("gmtime_r");
2443 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2444 		return got_error(GOT_ERR_NO_SPACE);
2445 
2446 	if (avail <= date_display_cols)
2447 		limit = MIN(sizeof(datebuf) - 1, avail);
2448 	else
2449 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2450 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2451 	if (tc)
2452 		wattr_on(view->window,
2453 		    COLOR_PAIR(tc->colorpair), NULL);
2454 	waddnstr(view->window, datebuf, limit);
2455 	if (tc)
2456 		wattr_off(view->window,
2457 		    COLOR_PAIR(tc->colorpair), NULL);
2458 	col = limit;
2459 	if (col > avail)
2460 		goto done;
2461 
2462 	if (avail >= 120) {
2463 		char *id_str;
2464 		err = got_object_id_str(&id_str, id);
2465 		if (err)
2466 			goto done;
2467 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2468 		if (tc)
2469 			wattr_on(view->window,
2470 			    COLOR_PAIR(tc->colorpair), NULL);
2471 		wprintw(view->window, "%.8s ", id_str);
2472 		if (tc)
2473 			wattr_off(view->window,
2474 			    COLOR_PAIR(tc->colorpair), NULL);
2475 		free(id_str);
2476 		col += 9;
2477 		if (col > avail)
2478 			goto done;
2479 	}
2480 
2481 	if (s->use_committer)
2482 		author = strdup(got_object_commit_get_committer(commit));
2483 	else
2484 		author = strdup(got_object_commit_get_author(commit));
2485 	if (author == NULL) {
2486 		err = got_error_from_errno("strdup");
2487 		goto done;
2488 	}
2489 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2490 	if (err)
2491 		goto done;
2492 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2493 	if (tc)
2494 		wattr_on(view->window,
2495 		    COLOR_PAIR(tc->colorpair), NULL);
2496 	waddwstr(view->window, wauthor);
2497 	col += author_width;
2498 	while (col < avail && author_width < author_display_cols + 2) {
2499 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2500 		    author_width == marker_column &&
2501 		    entry->idx == tog_base_commit.idx) {
2502 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2503 			if (tc)
2504 				wattr_on(view->window,
2505 				    COLOR_PAIR(tc->colorpair), NULL);
2506 			waddch(view->window, tog_base_commit.marker);
2507 			if (tc)
2508 				wattr_off(view->window,
2509 				    COLOR_PAIR(tc->colorpair), NULL);
2510 		} else
2511 			waddch(view->window, ' ');
2512 		col++;
2513 		author_width++;
2514 	}
2515 	if (tc)
2516 		wattr_off(view->window,
2517 		    COLOR_PAIR(tc->colorpair), NULL);
2518 	if (col > avail)
2519 		goto done;
2520 
2521 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2522 	if (err)
2523 		goto done;
2524 	logmsg = logmsg0;
2525 	while (*logmsg == '\n')
2526 		logmsg++;
2527 	newline = strchr(logmsg, '\n');
2528 	if (newline)
2529 		*newline = '\0';
2530 
2531 	limit = avail - col;
2532 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2533 		limit--;	/* for the border */
2534 
2535 	/* Prepend reference labels to log message if possible .*/
2536 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2537 	err = build_refs_str(&refs_str, refs, id, s->repo);
2538 	if (err)
2539 		goto done;
2540 	if (refs_str) {
2541 		char *rs;
2542 
2543 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2544 			err = got_error_from_errno("asprintf");
2545 			goto done;
2546 		}
2547 		err = format_line(&wrefstr, &refstr_width,
2548 		    &scrollx, rs, view->x, limit, col, 1);
2549 		free(rs);
2550 		if (err)
2551 			goto done;
2552 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2553 		if (tc)
2554 			wattr_on(view->window,
2555 			    COLOR_PAIR(tc->colorpair), NULL);
2556 		waddwstr(view->window, &wrefstr[scrollx]);
2557 		if (tc)
2558 			wattr_off(view->window,
2559 			    COLOR_PAIR(tc->colorpair), NULL);
2560 		col += MAX(refstr_width, 0);
2561 		if (col > avail)
2562 			goto done;
2563 
2564 		if (col < avail) {
2565 			waddch(view->window, ' ');
2566 			col++;
2567 		}
2568 
2569 		if (refstr_width > 0)
2570 			logmsg_x = 0;
2571 		else {
2572 			int unscrolled_refstr_width;
2573 			size_t len = wcslen(wrefstr);
2574 
2575 			/*
2576 			 * No need to check for -1 return value here since
2577 			 * unprintables have been replaced by span_wline().
2578 			 */
2579 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2580 			unscrolled_refstr_width += 1; /* trailing space */
2581 			logmsg_x = view->x - unscrolled_refstr_width;
2582 		}
2583 
2584 		limit = avail - col;
2585 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2586 			limit--;	/* for the border */
2587 	} else
2588 		logmsg_x = view->x;
2589 
2590 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2591 	    limit, col, 1);
2592 	if (err)
2593 		goto done;
2594 	waddwstr(view->window, &wlogmsg[scrollx]);
2595 	col += MAX(logmsg_width, 0);
2596 	while (col < avail) {
2597 		waddch(view->window, ' ');
2598 		col++;
2599 	}
2600 done:
2601 	free(logmsg0);
2602 	free(wlogmsg);
2603 	free(wrefstr);
2604 	free(refs_str);
2605 	free(author);
2606 	free(wauthor);
2607 	free(line);
2608 	return err;
2609 }
2610 
2611 static struct commit_queue_entry *
2612 alloc_commit_queue_entry(struct got_commit_object *commit,
2613     struct got_object_id *id)
2614 {
2615 	struct commit_queue_entry *entry;
2616 	struct got_object_id *dup;
2617 
2618 	entry = calloc(1, sizeof(*entry));
2619 	if (entry == NULL)
2620 		return NULL;
2621 
2622 	dup = got_object_id_dup(id);
2623 	if (dup == NULL) {
2624 		free(entry);
2625 		return NULL;
2626 	}
2627 
2628 	entry->id = dup;
2629 	entry->commit = commit;
2630 	return entry;
2631 }
2632 
2633 static void
2634 pop_commit(struct commit_queue *commits)
2635 {
2636 	struct commit_queue_entry *entry;
2637 
2638 	entry = TAILQ_FIRST(&commits->head);
2639 	TAILQ_REMOVE(&commits->head, entry, entry);
2640 	got_object_commit_close(entry->commit);
2641 	commits->ncommits--;
2642 	free(entry->id);
2643 	free(entry);
2644 }
2645 
2646 static void
2647 free_commits(struct commit_queue *commits)
2648 {
2649 	while (!TAILQ_EMPTY(&commits->head))
2650 		pop_commit(commits);
2651 }
2652 
2653 static const struct got_error *
2654 match_commit(int *have_match, struct got_object_id *id,
2655     struct got_commit_object *commit, regex_t *regex)
2656 {
2657 	const struct got_error *err = NULL;
2658 	regmatch_t regmatch;
2659 	char *id_str = NULL, *logmsg = NULL;
2660 
2661 	*have_match = 0;
2662 
2663 	err = got_object_id_str(&id_str, id);
2664 	if (err)
2665 		return err;
2666 
2667 	err = got_object_commit_get_logmsg(&logmsg, commit);
2668 	if (err)
2669 		goto done;
2670 
2671 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2672 	    &regmatch, 0) == 0 ||
2673 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2674 	    &regmatch, 0) == 0 ||
2675 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2676 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2677 		*have_match = 1;
2678 done:
2679 	free(id_str);
2680 	free(logmsg);
2681 	return err;
2682 }
2683 
2684 static const struct got_error *
2685 queue_commits(struct tog_log_thread_args *a)
2686 {
2687 	const struct got_error *err = NULL;
2688 
2689 	/*
2690 	 * We keep all commits open throughout the lifetime of the log
2691 	 * view in order to avoid having to re-fetch commits from disk
2692 	 * while updating the display.
2693 	 */
2694 	do {
2695 		struct got_object_id id;
2696 		struct got_commit_object *commit;
2697 		struct commit_queue_entry *entry;
2698 		int limit_match = 0;
2699 		int errcode;
2700 
2701 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2702 		    NULL, NULL);
2703 		if (err)
2704 			break;
2705 
2706 		err = got_object_open_as_commit(&commit, a->repo, &id);
2707 		if (err)
2708 			break;
2709 		entry = alloc_commit_queue_entry(commit, &id);
2710 		if (entry == NULL) {
2711 			err = got_error_from_errno("alloc_commit_queue_entry");
2712 			break;
2713 		}
2714 
2715 		errcode = pthread_mutex_lock(&tog_mutex);
2716 		if (errcode) {
2717 			err = got_error_set_errno(errcode,
2718 			    "pthread_mutex_lock");
2719 			break;
2720 		}
2721 
2722 		entry->idx = a->real_commits->ncommits;
2723 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2724 		a->real_commits->ncommits++;
2725 
2726 		if (*a->limiting) {
2727 			err = match_commit(&limit_match, &id, commit,
2728 			    a->limit_regex);
2729 			if (err)
2730 				break;
2731 
2732 			if (limit_match) {
2733 				struct commit_queue_entry *matched;
2734 
2735 				matched = alloc_commit_queue_entry(
2736 				    entry->commit, entry->id);
2737 				if (matched == NULL) {
2738 					err = got_error_from_errno(
2739 					    "alloc_commit_queue_entry");
2740 					break;
2741 				}
2742 				matched->commit = entry->commit;
2743 				got_object_commit_retain(entry->commit);
2744 
2745 				matched->idx = a->limit_commits->ncommits;
2746 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2747 				    matched, entry);
2748 				a->limit_commits->ncommits++;
2749 			}
2750 
2751 			/*
2752 			 * This is how we signal log_thread() that we
2753 			 * have found a match, and that it should be
2754 			 * counted as a new entry for the view.
2755 			 */
2756 			a->limit_match = limit_match;
2757 		}
2758 
2759 		if (*a->searching == TOG_SEARCH_FORWARD &&
2760 		    !*a->search_next_done) {
2761 			int have_match;
2762 			err = match_commit(&have_match, &id, commit, a->regex);
2763 			if (err)
2764 				break;
2765 
2766 			if (*a->limiting) {
2767 				if (limit_match && have_match)
2768 					*a->search_next_done =
2769 					    TOG_SEARCH_HAVE_MORE;
2770 			} else if (have_match)
2771 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2772 		}
2773 
2774 		errcode = pthread_mutex_unlock(&tog_mutex);
2775 		if (errcode && err == NULL)
2776 			err = got_error_set_errno(errcode,
2777 			    "pthread_mutex_unlock");
2778 		if (err)
2779 			break;
2780 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2781 
2782 	return err;
2783 }
2784 
2785 static void
2786 select_commit(struct tog_log_view_state *s)
2787 {
2788 	struct commit_queue_entry *entry;
2789 	int ncommits = 0;
2790 
2791 	entry = s->first_displayed_entry;
2792 	while (entry) {
2793 		if (ncommits == s->selected) {
2794 			s->selected_entry = entry;
2795 			break;
2796 		}
2797 		entry = TAILQ_NEXT(entry, entry);
2798 		ncommits++;
2799 	}
2800 }
2801 
2802 static const struct got_error *
2803 draw_commits(struct tog_view *view)
2804 {
2805 	const struct got_error *err = NULL;
2806 	struct tog_log_view_state *s = &view->state.log;
2807 	struct commit_queue_entry *entry = s->selected_entry;
2808 	int limit = view->nlines;
2809 	int width;
2810 	int ncommits, author_cols = 4, refstr_cols;
2811 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2812 	char *refs_str = NULL;
2813 	wchar_t *wline;
2814 	struct tog_color *tc;
2815 	static const size_t date_display_cols = 12;
2816 	struct got_reflist_head *refs;
2817 
2818 	if (view_is_hsplit_top(view))
2819 		--limit;  /* account for border */
2820 
2821 	if (s->selected_entry &&
2822 	    !(view->searching && view->search_next_done == 0)) {
2823 		err = got_object_id_str(&id_str, s->selected_entry->id);
2824 		if (err)
2825 			return err;
2826 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2827 		    s->selected_entry->id);
2828 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2829 		    s->repo);
2830 		if (err)
2831 			goto done;
2832 	}
2833 
2834 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2835 		halfdelay(10); /* disable fast refresh */
2836 
2837 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2838 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2839 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2840 		    (view->searching && !view->search_next_done) ?
2841 		    "searching..." : "loading...") == -1) {
2842 			err = got_error_from_errno("asprintf");
2843 			goto done;
2844 		}
2845 	} else {
2846 		const char *search_str = NULL;
2847 		const char *limit_str = NULL;
2848 
2849 		if (view->searching) {
2850 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2851 				search_str = "no more matches";
2852 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2853 				search_str = "no matches found";
2854 			else if (!view->search_next_done)
2855 				search_str = "searching...";
2856 		}
2857 
2858 		if (s->limit_view && s->commits->ncommits == 0)
2859 			limit_str = "no matches found";
2860 
2861 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2862 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2863 		    search_str ? search_str : (refs_str ? refs_str : ""),
2864 		    limit_str ? limit_str : "") == -1) {
2865 			err = got_error_from_errno("asprintf");
2866 			goto done;
2867 		}
2868 	}
2869 
2870 	free(refs_str);
2871 	refs_str = NULL;
2872 
2873 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2874 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2875 		    "........................................",
2876 		    s->in_repo_path, ncommits_str) == -1) {
2877 			err = got_error_from_errno("asprintf");
2878 			header = NULL;
2879 			goto done;
2880 		}
2881 	} else if (asprintf(&header, "commit %s%s",
2882 	    id_str ? id_str : "........................................",
2883 	    ncommits_str) == -1) {
2884 		err = got_error_from_errno("asprintf");
2885 		header = NULL;
2886 		goto done;
2887 	}
2888 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2889 	if (err)
2890 		goto done;
2891 
2892 	werase(view->window);
2893 
2894 	if (view_needs_focus_indication(view))
2895 		wstandout(view->window);
2896 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2897 	if (tc)
2898 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2899 	waddwstr(view->window, wline);
2900 	while (width < view->ncols) {
2901 		waddch(view->window, ' ');
2902 		width++;
2903 	}
2904 	if (tc)
2905 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2906 	if (view_needs_focus_indication(view))
2907 		wstandend(view->window);
2908 	free(wline);
2909 	if (limit <= 1)
2910 		goto done;
2911 
2912 	/* Grow author column size if necessary, and set view->maxx. */
2913 	entry = s->first_displayed_entry;
2914 	ncommits = 0;
2915 	view->maxx = 0;
2916 	while (entry) {
2917 		struct got_commit_object *c = entry->commit;
2918 		char *author, *eol, *msg, *msg0;
2919 		wchar_t *wauthor, *wmsg;
2920 		int width;
2921 		if (ncommits >= limit - 1)
2922 			break;
2923 		if (s->use_committer)
2924 			author = strdup(got_object_commit_get_committer(c));
2925 		else
2926 			author = strdup(got_object_commit_get_author(c));
2927 		if (author == NULL) {
2928 			err = got_error_from_errno("strdup");
2929 			goto done;
2930 		}
2931 		err = format_author(&wauthor, &width, author, COLS,
2932 		    date_display_cols);
2933 		if (author_cols < width)
2934 			author_cols = width;
2935 		free(wauthor);
2936 		free(author);
2937 		if (err)
2938 			goto done;
2939 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2940 		    entry->id);
2941 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2942 		if (err)
2943 			goto done;
2944 		if (refs_str) {
2945 			wchar_t *ws;
2946 			err = format_line(&ws, &width, NULL, refs_str,
2947 			    0, INT_MAX, date_display_cols + author_cols, 0);
2948 			free(ws);
2949 			free(refs_str);
2950 			refs_str = NULL;
2951 			if (err)
2952 				goto done;
2953 			refstr_cols = width + 3; /* account for [ ] + space */
2954 		} else
2955 			refstr_cols = 0;
2956 		err = got_object_commit_get_logmsg(&msg0, c);
2957 		if (err)
2958 			goto done;
2959 		msg = msg0;
2960 		while (*msg == '\n')
2961 			++msg;
2962 		if ((eol = strchr(msg, '\n')))
2963 			*eol = '\0';
2964 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2965 		    date_display_cols + author_cols + refstr_cols, 0);
2966 		if (err)
2967 			goto done;
2968 		view->maxx = MAX(view->maxx, width + refstr_cols);
2969 		free(msg0);
2970 		free(wmsg);
2971 		ncommits++;
2972 		entry = TAILQ_NEXT(entry, entry);
2973 	}
2974 
2975 	entry = s->first_displayed_entry;
2976 	s->last_displayed_entry = s->first_displayed_entry;
2977 	ncommits = 0;
2978 	while (entry) {
2979 		if (ncommits >= limit - 1)
2980 			break;
2981 		if (ncommits == s->selected)
2982 			wstandout(view->window);
2983 		err = draw_commit(view, entry, date_display_cols, author_cols);
2984 		if (ncommits == s->selected)
2985 			wstandend(view->window);
2986 		if (err)
2987 			goto done;
2988 		ncommits++;
2989 		s->last_displayed_entry = entry;
2990 		entry = TAILQ_NEXT(entry, entry);
2991 	}
2992 
2993 	view_border(view);
2994 done:
2995 	free(id_str);
2996 	free(refs_str);
2997 	free(ncommits_str);
2998 	free(header);
2999 	return err;
3000 }
3001 
3002 static void
3003 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3004 {
3005 	struct commit_queue_entry *entry;
3006 	int nscrolled = 0;
3007 
3008 	entry = TAILQ_FIRST(&s->commits->head);
3009 	if (s->first_displayed_entry == entry)
3010 		return;
3011 
3012 	entry = s->first_displayed_entry;
3013 	while (entry && nscrolled < maxscroll) {
3014 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3015 		if (entry) {
3016 			s->first_displayed_entry = entry;
3017 			nscrolled++;
3018 		}
3019 	}
3020 }
3021 
3022 static const struct got_error *
3023 trigger_log_thread(struct tog_view *view, int wait)
3024 {
3025 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3026 	int errcode;
3027 
3028 	if (!using_mock_io)
3029 		halfdelay(1); /* fast refresh while loading commits */
3030 
3031 	while (!ta->log_complete && !tog_thread_error &&
3032 	    (ta->commits_needed > 0 || ta->load_all)) {
3033 		/* Wake the log thread. */
3034 		errcode = pthread_cond_signal(&ta->need_commits);
3035 		if (errcode)
3036 			return got_error_set_errno(errcode,
3037 			    "pthread_cond_signal");
3038 
3039 		/*
3040 		 * The mutex will be released while the view loop waits
3041 		 * in wgetch(), at which time the log thread will run.
3042 		 */
3043 		if (!wait)
3044 			break;
3045 
3046 		/* Display progress update in log view. */
3047 		show_log_view(view);
3048 		update_panels();
3049 		doupdate();
3050 
3051 		/* Wait right here while next commit is being loaded. */
3052 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3053 		if (errcode)
3054 			return got_error_set_errno(errcode,
3055 			    "pthread_cond_wait");
3056 
3057 		/* Display progress update in log view. */
3058 		show_log_view(view);
3059 		update_panels();
3060 		doupdate();
3061 	}
3062 
3063 	return NULL;
3064 }
3065 
3066 static const struct got_error *
3067 request_log_commits(struct tog_view *view)
3068 {
3069 	struct tog_log_view_state	*state = &view->state.log;
3070 	const struct got_error		*err = NULL;
3071 
3072 	if (state->thread_args.log_complete)
3073 		return NULL;
3074 
3075 	state->thread_args.commits_needed += view->nscrolled;
3076 	err = trigger_log_thread(view, 1);
3077 	view->nscrolled = 0;
3078 
3079 	return err;
3080 }
3081 
3082 static const struct got_error *
3083 log_scroll_down(struct tog_view *view, int maxscroll)
3084 {
3085 	struct tog_log_view_state *s = &view->state.log;
3086 	const struct got_error *err = NULL;
3087 	struct commit_queue_entry *pentry;
3088 	int nscrolled = 0, ncommits_needed;
3089 
3090 	if (s->last_displayed_entry == NULL)
3091 		return NULL;
3092 
3093 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3094 	if (s->commits->ncommits < ncommits_needed &&
3095 	    !s->thread_args.log_complete) {
3096 		/*
3097 		 * Ask the log thread for required amount of commits.
3098 		 */
3099 		s->thread_args.commits_needed +=
3100 		    ncommits_needed - s->commits->ncommits;
3101 		err = trigger_log_thread(view, 1);
3102 		if (err)
3103 			return err;
3104 	}
3105 
3106 	do {
3107 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3108 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3109 			break;
3110 
3111 		s->last_displayed_entry = pentry ?
3112 		    pentry : s->last_displayed_entry;
3113 
3114 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3115 		if (pentry == NULL)
3116 			break;
3117 		s->first_displayed_entry = pentry;
3118 	} while (++nscrolled < maxscroll);
3119 
3120 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3121 		view->nscrolled += nscrolled;
3122 	else
3123 		view->nscrolled = 0;
3124 
3125 	return err;
3126 }
3127 
3128 static const struct got_error *
3129 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3130     struct got_commit_object *commit, struct got_object_id *commit_id,
3131     struct tog_view *log_view, struct got_repository *repo)
3132 {
3133 	const struct got_error *err;
3134 	struct got_object_qid *parent_id;
3135 	struct tog_view *diff_view;
3136 
3137 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3138 	if (diff_view == NULL)
3139 		return got_error_from_errno("view_open");
3140 
3141 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3142 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3143 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3144 	if (err == NULL)
3145 		*new_view = diff_view;
3146 	return err;
3147 }
3148 
3149 static const struct got_error *
3150 tree_view_visit_subtree(struct tog_tree_view_state *s,
3151     struct got_tree_object *subtree)
3152 {
3153 	struct tog_parent_tree *parent;
3154 
3155 	parent = calloc(1, sizeof(*parent));
3156 	if (parent == NULL)
3157 		return got_error_from_errno("calloc");
3158 
3159 	parent->tree = s->tree;
3160 	parent->first_displayed_entry = s->first_displayed_entry;
3161 	parent->selected_entry = s->selected_entry;
3162 	parent->selected = s->selected;
3163 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3164 	s->tree = subtree;
3165 	s->selected = 0;
3166 	s->first_displayed_entry = NULL;
3167 	return NULL;
3168 }
3169 
3170 static const struct got_error *
3171 tree_view_walk_path(struct tog_tree_view_state *s,
3172     struct got_commit_object *commit, const char *path)
3173 {
3174 	const struct got_error *err = NULL;
3175 	struct got_tree_object *tree = NULL;
3176 	const char *p;
3177 	char *slash, *subpath = NULL;
3178 
3179 	/* Walk the path and open corresponding tree objects. */
3180 	p = path;
3181 	while (*p) {
3182 		struct got_tree_entry *te;
3183 		struct got_object_id *tree_id;
3184 		char *te_name;
3185 
3186 		while (p[0] == '/')
3187 			p++;
3188 
3189 		/* Ensure the correct subtree entry is selected. */
3190 		slash = strchr(p, '/');
3191 		if (slash == NULL)
3192 			te_name = strdup(p);
3193 		else
3194 			te_name = strndup(p, slash - p);
3195 		if (te_name == NULL) {
3196 			err = got_error_from_errno("strndup");
3197 			break;
3198 		}
3199 		te = got_object_tree_find_entry(s->tree, te_name);
3200 		if (te == NULL) {
3201 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3202 			free(te_name);
3203 			break;
3204 		}
3205 		free(te_name);
3206 		s->first_displayed_entry = s->selected_entry = te;
3207 
3208 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3209 			break; /* jump to this file's entry */
3210 
3211 		slash = strchr(p, '/');
3212 		if (slash)
3213 			subpath = strndup(path, slash - path);
3214 		else
3215 			subpath = strdup(path);
3216 		if (subpath == NULL) {
3217 			err = got_error_from_errno("strdup");
3218 			break;
3219 		}
3220 
3221 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3222 		    subpath);
3223 		if (err)
3224 			break;
3225 
3226 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3227 		free(tree_id);
3228 		if (err)
3229 			break;
3230 
3231 		err = tree_view_visit_subtree(s, tree);
3232 		if (err) {
3233 			got_object_tree_close(tree);
3234 			break;
3235 		}
3236 		if (slash == NULL)
3237 			break;
3238 		free(subpath);
3239 		subpath = NULL;
3240 		p = slash;
3241 	}
3242 
3243 	free(subpath);
3244 	return err;
3245 }
3246 
3247 static const struct got_error *
3248 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3249     struct commit_queue_entry *entry, const char *path,
3250     const char *head_ref_name, struct got_repository *repo)
3251 {
3252 	const struct got_error *err = NULL;
3253 	struct tog_tree_view_state *s;
3254 	struct tog_view *tree_view;
3255 
3256 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3257 	if (tree_view == NULL)
3258 		return got_error_from_errno("view_open");
3259 
3260 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3261 	if (err)
3262 		return err;
3263 	s = &tree_view->state.tree;
3264 
3265 	*new_view = tree_view;
3266 
3267 	if (got_path_is_root_dir(path))
3268 		return NULL;
3269 
3270 	return tree_view_walk_path(s, entry->commit, path);
3271 }
3272 
3273 static const struct got_error *
3274 block_signals_used_by_main_thread(void)
3275 {
3276 	sigset_t sigset;
3277 	int errcode;
3278 
3279 	if (sigemptyset(&sigset) == -1)
3280 		return got_error_from_errno("sigemptyset");
3281 
3282 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3283 	if (sigaddset(&sigset, SIGWINCH) == -1)
3284 		return got_error_from_errno("sigaddset");
3285 	if (sigaddset(&sigset, SIGCONT) == -1)
3286 		return got_error_from_errno("sigaddset");
3287 	if (sigaddset(&sigset, SIGINT) == -1)
3288 		return got_error_from_errno("sigaddset");
3289 	if (sigaddset(&sigset, SIGTERM) == -1)
3290 		return got_error_from_errno("sigaddset");
3291 
3292 	/* ncurses handles SIGTSTP */
3293 	if (sigaddset(&sigset, SIGTSTP) == -1)
3294 		return got_error_from_errno("sigaddset");
3295 
3296 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3297 	if (errcode)
3298 		return got_error_set_errno(errcode, "pthread_sigmask");
3299 
3300 	return NULL;
3301 }
3302 
3303 static void *
3304 log_thread(void *arg)
3305 {
3306 	const struct got_error *err = NULL;
3307 	int errcode = 0;
3308 	struct tog_log_thread_args *a = arg;
3309 	int done = 0;
3310 
3311 	/*
3312 	 * Sync startup with main thread such that we begin our
3313 	 * work once view_input() has released the mutex.
3314 	 */
3315 	errcode = pthread_mutex_lock(&tog_mutex);
3316 	if (errcode) {
3317 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3318 		return (void *)err;
3319 	}
3320 
3321 	err = block_signals_used_by_main_thread();
3322 	if (err) {
3323 		pthread_mutex_unlock(&tog_mutex);
3324 		goto done;
3325 	}
3326 
3327 	while (!done && !err && !tog_fatal_signal_received()) {
3328 		errcode = pthread_mutex_unlock(&tog_mutex);
3329 		if (errcode) {
3330 			err = got_error_set_errno(errcode,
3331 			    "pthread_mutex_unlock");
3332 			goto done;
3333 		}
3334 		err = queue_commits(a);
3335 		if (err) {
3336 			if (err->code != GOT_ERR_ITER_COMPLETED)
3337 				goto done;
3338 			err = NULL;
3339 			done = 1;
3340 			a->commits_needed = 0;
3341 		} else if (a->commits_needed > 0 && !a->load_all) {
3342 			if (*a->limiting) {
3343 				if (a->limit_match)
3344 					a->commits_needed--;
3345 			} else
3346 				a->commits_needed--;
3347 		}
3348 
3349 		errcode = pthread_mutex_lock(&tog_mutex);
3350 		if (errcode) {
3351 			err = got_error_set_errno(errcode,
3352 			    "pthread_mutex_lock");
3353 			goto done;
3354 		} else if (*a->quit)
3355 			done = 1;
3356 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3357 			*a->first_displayed_entry =
3358 			    TAILQ_FIRST(&a->limit_commits->head);
3359 			*a->selected_entry = *a->first_displayed_entry;
3360 		} else if (*a->first_displayed_entry == NULL) {
3361 			*a->first_displayed_entry =
3362 			    TAILQ_FIRST(&a->real_commits->head);
3363 			*a->selected_entry = *a->first_displayed_entry;
3364 		}
3365 
3366 		errcode = pthread_cond_signal(&a->commit_loaded);
3367 		if (errcode) {
3368 			err = got_error_set_errno(errcode,
3369 			    "pthread_cond_signal");
3370 			pthread_mutex_unlock(&tog_mutex);
3371 			goto done;
3372 		}
3373 
3374 		if (a->commits_needed == 0 &&
3375 		    a->need_commit_marker && a->worktree) {
3376 			errcode = pthread_mutex_unlock(&tog_mutex);
3377 			if (errcode) {
3378 				err = got_error_set_errno(errcode,
3379 				    "pthread_mutex_unlock");
3380 				goto done;
3381 			}
3382 			err = got_worktree_get_state(&tog_base_commit.marker,
3383 			    a->repo, a->worktree, NULL, NULL);
3384 			if (err)
3385 				goto done;
3386 			errcode = pthread_mutex_lock(&tog_mutex);
3387 			if (errcode) {
3388 				err = got_error_set_errno(errcode,
3389 				    "pthread_mutex_lock");
3390 				goto done;
3391 			}
3392 			a->need_commit_marker = 0;
3393 			/*
3394 			 * The main thread did not close this
3395 			 * work tree yet. Close it now.
3396 			 */
3397 			got_worktree_close(a->worktree);
3398 			a->worktree = NULL;
3399 
3400 			if (*a->quit)
3401 				done = 1;
3402 		}
3403 
3404 		if (done)
3405 			a->commits_needed = 0;
3406 		else {
3407 			if (a->commits_needed == 0 && !a->load_all) {
3408 				if (tog_io.wait_for_ui) {
3409 					errcode = pthread_cond_signal(
3410 					    &a->log_loaded);
3411 					if (errcode && err == NULL)
3412 						err = got_error_set_errno(
3413 						    errcode,
3414 						    "pthread_cond_signal");
3415 				}
3416 
3417 				errcode = pthread_cond_wait(&a->need_commits,
3418 				    &tog_mutex);
3419 				if (errcode) {
3420 					err = got_error_set_errno(errcode,
3421 					    "pthread_cond_wait");
3422 					pthread_mutex_unlock(&tog_mutex);
3423 					goto done;
3424 				}
3425 				if (*a->quit)
3426 					done = 1;
3427 			}
3428 		}
3429 	}
3430 	a->log_complete = 1;
3431 	if (tog_io.wait_for_ui) {
3432 		errcode = pthread_cond_signal(&a->log_loaded);
3433 		if (errcode && err == NULL)
3434 			err = got_error_set_errno(errcode,
3435 			    "pthread_cond_signal");
3436 	}
3437 
3438 	errcode = pthread_mutex_unlock(&tog_mutex);
3439 	if (errcode)
3440 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3441 done:
3442 	if (err) {
3443 		tog_thread_error = 1;
3444 		pthread_cond_signal(&a->commit_loaded);
3445 		if (a->worktree) {
3446 			got_worktree_close(a->worktree);
3447 			a->worktree = NULL;
3448 		}
3449 	}
3450 	return (void *)err;
3451 }
3452 
3453 static const struct got_error *
3454 stop_log_thread(struct tog_log_view_state *s)
3455 {
3456 	const struct got_error *err = NULL, *thread_err = NULL;
3457 	int errcode;
3458 
3459 	if (s->thread) {
3460 		s->quit = 1;
3461 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3462 		if (errcode)
3463 			return got_error_set_errno(errcode,
3464 			    "pthread_cond_signal");
3465 		errcode = pthread_mutex_unlock(&tog_mutex);
3466 		if (errcode)
3467 			return got_error_set_errno(errcode,
3468 			    "pthread_mutex_unlock");
3469 		errcode = pthread_join(s->thread, (void **)&thread_err);
3470 		if (errcode)
3471 			return got_error_set_errno(errcode, "pthread_join");
3472 		errcode = pthread_mutex_lock(&tog_mutex);
3473 		if (errcode)
3474 			return got_error_set_errno(errcode,
3475 			    "pthread_mutex_lock");
3476 		s->thread = NULL;
3477 	}
3478 
3479 	if (s->thread_args.repo) {
3480 		err = got_repo_close(s->thread_args.repo);
3481 		s->thread_args.repo = NULL;
3482 	}
3483 
3484 	if (s->thread_args.pack_fds) {
3485 		const struct got_error *pack_err =
3486 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3487 		if (err == NULL)
3488 			err = pack_err;
3489 		s->thread_args.pack_fds = NULL;
3490 	}
3491 
3492 	if (s->thread_args.graph) {
3493 		got_commit_graph_close(s->thread_args.graph);
3494 		s->thread_args.graph = NULL;
3495 	}
3496 
3497 	return err ? err : thread_err;
3498 }
3499 
3500 static const struct got_error *
3501 close_log_view(struct tog_view *view)
3502 {
3503 	const struct got_error *err = NULL;
3504 	struct tog_log_view_state *s = &view->state.log;
3505 	int errcode;
3506 
3507 	err = stop_log_thread(s);
3508 
3509 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3510 	if (errcode && err == NULL)
3511 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3512 
3513 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3514 	if (errcode && err == NULL)
3515 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3516 
3517 	free_commits(&s->limit_commits);
3518 	free_commits(&s->real_commits);
3519 	free(s->in_repo_path);
3520 	s->in_repo_path = NULL;
3521 	free(s->start_id);
3522 	s->start_id = NULL;
3523 	free(s->head_ref_name);
3524 	s->head_ref_name = NULL;
3525 	return err;
3526 }
3527 
3528 /*
3529  * We use two queues to implement the limit feature: first consists of
3530  * commits matching the current limit_regex; second is the real queue
3531  * of all known commits (real_commits). When the user starts limiting,
3532  * we swap queues such that all movement and displaying functionality
3533  * works with very slight change.
3534  */
3535 static const struct got_error *
3536 limit_log_view(struct tog_view *view)
3537 {
3538 	struct tog_log_view_state *s = &view->state.log;
3539 	struct commit_queue_entry *entry;
3540 	struct tog_view	*v = view;
3541 	const struct got_error *err = NULL;
3542 	char pattern[1024];
3543 	int ret;
3544 
3545 	if (view_is_hsplit_top(view))
3546 		v = view->child;
3547 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3548 		v = view->parent;
3549 
3550 	/* Get the pattern */
3551 	wmove(v->window, v->nlines - 1, 0);
3552 	wclrtoeol(v->window);
3553 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3554 	nodelay(v->window, FALSE);
3555 	nocbreak();
3556 	echo();
3557 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3558 	cbreak();
3559 	noecho();
3560 	nodelay(v->window, TRUE);
3561 	if (ret == ERR)
3562 		return NULL;
3563 
3564 	if (*pattern == '\0') {
3565 		/*
3566 		 * Safety measure for the situation where the user
3567 		 * resets limit without previously limiting anything.
3568 		 */
3569 		if (!s->limit_view)
3570 			return NULL;
3571 
3572 		/*
3573 		 * User could have pressed Ctrl+L, which refreshed the
3574 		 * commit queues, it means we can't save previously
3575 		 * (before limit took place) displayed entries,
3576 		 * because they would point to already free'ed memory,
3577 		 * so we are forced to always select first entry of
3578 		 * the queue.
3579 		 */
3580 		s->commits = &s->real_commits;
3581 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3582 		s->selected_entry = s->first_displayed_entry;
3583 		s->selected = 0;
3584 		s->limit_view = 0;
3585 
3586 		return NULL;
3587 	}
3588 
3589 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3590 		return NULL;
3591 
3592 	s->limit_view = 1;
3593 
3594 	/* Clear the screen while loading limit view */
3595 	s->first_displayed_entry = NULL;
3596 	s->last_displayed_entry = NULL;
3597 	s->selected_entry = NULL;
3598 	s->commits = &s->limit_commits;
3599 
3600 	/* Prepare limit queue for new search */
3601 	free_commits(&s->limit_commits);
3602 	s->limit_commits.ncommits = 0;
3603 
3604 	/* First process commits, which are in queue already */
3605 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3606 		int have_match = 0;
3607 
3608 		err = match_commit(&have_match, entry->id,
3609 		    entry->commit, &s->limit_regex);
3610 		if (err)
3611 			return err;
3612 
3613 		if (have_match) {
3614 			struct commit_queue_entry *matched;
3615 
3616 			matched = alloc_commit_queue_entry(entry->commit,
3617 			    entry->id);
3618 			if (matched == NULL) {
3619 				err = got_error_from_errno(
3620 				    "alloc_commit_queue_entry");
3621 				break;
3622 			}
3623 			matched->commit = entry->commit;
3624 			got_object_commit_retain(entry->commit);
3625 
3626 			matched->idx = s->limit_commits.ncommits;
3627 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3628 			    matched, entry);
3629 			s->limit_commits.ncommits++;
3630 		}
3631 	}
3632 
3633 	/* Second process all the commits, until we fill the screen */
3634 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3635 	    !s->thread_args.log_complete) {
3636 		s->thread_args.commits_needed +=
3637 		    view->nlines - s->limit_commits.ncommits - 1;
3638 		err = trigger_log_thread(view, 1);
3639 		if (err)
3640 			return err;
3641 	}
3642 
3643 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3644 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3645 	s->selected = 0;
3646 
3647 	return NULL;
3648 }
3649 
3650 static const struct got_error *
3651 search_start_log_view(struct tog_view *view)
3652 {
3653 	struct tog_log_view_state *s = &view->state.log;
3654 
3655 	s->matched_entry = NULL;
3656 	s->search_entry = NULL;
3657 	return NULL;
3658 }
3659 
3660 static const struct got_error *
3661 search_next_log_view(struct tog_view *view)
3662 {
3663 	const struct got_error *err = NULL;
3664 	struct tog_log_view_state *s = &view->state.log;
3665 	struct commit_queue_entry *entry;
3666 
3667 	/* Display progress update in log view. */
3668 	show_log_view(view);
3669 	update_panels();
3670 	doupdate();
3671 
3672 	if (s->search_entry) {
3673 		int errcode, ch;
3674 		errcode = pthread_mutex_unlock(&tog_mutex);
3675 		if (errcode)
3676 			return got_error_set_errno(errcode,
3677 			    "pthread_mutex_unlock");
3678 		ch = wgetch(view->window);
3679 		errcode = pthread_mutex_lock(&tog_mutex);
3680 		if (errcode)
3681 			return got_error_set_errno(errcode,
3682 			    "pthread_mutex_lock");
3683 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3684 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3685 			return NULL;
3686 		}
3687 		if (view->searching == TOG_SEARCH_FORWARD)
3688 			entry = TAILQ_NEXT(s->search_entry, entry);
3689 		else
3690 			entry = TAILQ_PREV(s->search_entry,
3691 			    commit_queue_head, entry);
3692 	} else if (s->matched_entry) {
3693 		/*
3694 		 * If the user has moved the cursor after we hit a match,
3695 		 * the position from where we should continue searching
3696 		 * might have changed.
3697 		 */
3698 		if (view->searching == TOG_SEARCH_FORWARD)
3699 			entry = TAILQ_NEXT(s->selected_entry, entry);
3700 		else
3701 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3702 			    entry);
3703 	} else {
3704 		entry = s->selected_entry;
3705 	}
3706 
3707 	while (1) {
3708 		int have_match = 0;
3709 
3710 		if (entry == NULL) {
3711 			if (s->thread_args.log_complete ||
3712 			    view->searching == TOG_SEARCH_BACKWARD) {
3713 				view->search_next_done =
3714 				    (s->matched_entry == NULL ?
3715 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3716 				s->search_entry = NULL;
3717 				return NULL;
3718 			}
3719 			/*
3720 			 * Poke the log thread for more commits and return,
3721 			 * allowing the main loop to make progress. Search
3722 			 * will resume at s->search_entry once we come back.
3723 			 */
3724 			s->thread_args.commits_needed++;
3725 			return trigger_log_thread(view, 0);
3726 		}
3727 
3728 		err = match_commit(&have_match, entry->id, entry->commit,
3729 		    &view->regex);
3730 		if (err)
3731 			break;
3732 		if (have_match) {
3733 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3734 			s->matched_entry = entry;
3735 			break;
3736 		}
3737 
3738 		s->search_entry = entry;
3739 		if (view->searching == TOG_SEARCH_FORWARD)
3740 			entry = TAILQ_NEXT(entry, entry);
3741 		else
3742 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3743 	}
3744 
3745 	if (s->matched_entry) {
3746 		int cur = s->selected_entry->idx;
3747 		while (cur < s->matched_entry->idx) {
3748 			err = input_log_view(NULL, view, KEY_DOWN);
3749 			if (err)
3750 				return err;
3751 			cur++;
3752 		}
3753 		while (cur > s->matched_entry->idx) {
3754 			err = input_log_view(NULL, view, KEY_UP);
3755 			if (err)
3756 				return err;
3757 			cur--;
3758 		}
3759 	}
3760 
3761 	s->search_entry = NULL;
3762 
3763 	return NULL;
3764 }
3765 
3766 static const struct got_error *
3767 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3768     struct got_repository *repo, const char *head_ref_name,
3769     const char *in_repo_path, int log_branches,
3770     struct got_worktree *worktree)
3771 {
3772 	const struct got_error *err = NULL;
3773 	struct tog_log_view_state *s = &view->state.log;
3774 	struct got_repository *thread_repo = NULL;
3775 	struct got_commit_graph *thread_graph = NULL;
3776 	int errcode;
3777 
3778 	if (in_repo_path != s->in_repo_path) {
3779 		free(s->in_repo_path);
3780 		s->in_repo_path = strdup(in_repo_path);
3781 		if (s->in_repo_path == NULL) {
3782 			err = got_error_from_errno("strdup");
3783 			goto done;
3784 		}
3785 	}
3786 
3787 	/* The commit queue only contains commits being displayed. */
3788 	TAILQ_INIT(&s->real_commits.head);
3789 	s->real_commits.ncommits = 0;
3790 	s->commits = &s->real_commits;
3791 
3792 	TAILQ_INIT(&s->limit_commits.head);
3793 	s->limit_view = 0;
3794 	s->limit_commits.ncommits = 0;
3795 
3796 	s->repo = repo;
3797 	if (head_ref_name) {
3798 		s->head_ref_name = strdup(head_ref_name);
3799 		if (s->head_ref_name == NULL) {
3800 			err = got_error_from_errno("strdup");
3801 			goto done;
3802 		}
3803 	}
3804 	s->start_id = got_object_id_dup(start_id);
3805 	if (s->start_id == NULL) {
3806 		err = got_error_from_errno("got_object_id_dup");
3807 		goto done;
3808 	}
3809 	s->log_branches = log_branches;
3810 	s->use_committer = 1;
3811 
3812 	STAILQ_INIT(&s->colors);
3813 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3814 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3815 		    get_color_value("TOG_COLOR_COMMIT"));
3816 		if (err)
3817 			goto done;
3818 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3819 		    get_color_value("TOG_COLOR_AUTHOR"));
3820 		if (err) {
3821 			free_colors(&s->colors);
3822 			goto done;
3823 		}
3824 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3825 		    get_color_value("TOG_COLOR_DATE"));
3826 		if (err) {
3827 			free_colors(&s->colors);
3828 			goto done;
3829 		}
3830 	}
3831 
3832 	view->show = show_log_view;
3833 	view->input = input_log_view;
3834 	view->resize = resize_log_view;
3835 	view->close = close_log_view;
3836 	view->search_start = search_start_log_view;
3837 	view->search_next = search_next_log_view;
3838 
3839 	if (s->thread_args.pack_fds == NULL) {
3840 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3841 		if (err)
3842 			goto done;
3843 	}
3844 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3845 	    s->thread_args.pack_fds);
3846 	if (err)
3847 		goto done;
3848 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3849 	    !s->log_branches);
3850 	if (err)
3851 		goto done;
3852 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3853 	    s->repo, NULL, NULL);
3854 	if (err)
3855 		goto done;
3856 
3857 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3858 	if (errcode) {
3859 		err = got_error_set_errno(errcode, "pthread_cond_init");
3860 		goto done;
3861 	}
3862 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3863 	if (errcode) {
3864 		err = got_error_set_errno(errcode, "pthread_cond_init");
3865 		goto done;
3866 	}
3867 
3868 	if (using_mock_io) {
3869 		int rc;
3870 
3871 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3872 		if (rc)
3873 			return got_error_set_errno(rc, "pthread_cond_init");
3874 	}
3875 
3876 	s->thread_args.commits_needed = view->nlines;
3877 	s->thread_args.graph = thread_graph;
3878 	s->thread_args.real_commits = &s->real_commits;
3879 	s->thread_args.limit_commits = &s->limit_commits;
3880 	s->thread_args.in_repo_path = s->in_repo_path;
3881 	s->thread_args.start_id = s->start_id;
3882 	s->thread_args.repo = thread_repo;
3883 	s->thread_args.log_complete = 0;
3884 	s->thread_args.quit = &s->quit;
3885 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3886 	s->thread_args.selected_entry = &s->selected_entry;
3887 	s->thread_args.searching = &view->searching;
3888 	s->thread_args.search_next_done = &view->search_next_done;
3889 	s->thread_args.regex = &view->regex;
3890 	s->thread_args.limiting = &s->limit_view;
3891 	s->thread_args.limit_regex = &s->limit_regex;
3892 	s->thread_args.limit_commits = &s->limit_commits;
3893 	s->thread_args.worktree = worktree;
3894 	if (worktree)
3895 		s->thread_args.need_commit_marker = 1;
3896 done:
3897 	if (err) {
3898 		if (view->close == NULL)
3899 			close_log_view(view);
3900 		view_close(view);
3901 	}
3902 	return err;
3903 }
3904 
3905 static const struct got_error *
3906 show_log_view(struct tog_view *view)
3907 {
3908 	const struct got_error *err;
3909 	struct tog_log_view_state *s = &view->state.log;
3910 
3911 	if (s->thread == NULL) {
3912 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3913 		    &s->thread_args);
3914 		if (errcode)
3915 			return got_error_set_errno(errcode, "pthread_create");
3916 		if (s->thread_args.commits_needed > 0) {
3917 			err = trigger_log_thread(view, 1);
3918 			if (err)
3919 				return err;
3920 		}
3921 	}
3922 
3923 	return draw_commits(view);
3924 }
3925 
3926 static void
3927 log_move_cursor_up(struct tog_view *view, int page, int home)
3928 {
3929 	struct tog_log_view_state *s = &view->state.log;
3930 
3931 	if (s->first_displayed_entry == NULL)
3932 		return;
3933 	if (s->selected_entry->idx == 0)
3934 		view->count = 0;
3935 
3936 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3937 	    || home)
3938 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3939 
3940 	if (!page && !home && s->selected > 0)
3941 		--s->selected;
3942 	else
3943 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3944 
3945 	select_commit(s);
3946 	return;
3947 }
3948 
3949 static const struct got_error *
3950 log_move_cursor_down(struct tog_view *view, int page)
3951 {
3952 	struct tog_log_view_state	*s = &view->state.log;
3953 	const struct got_error		*err = NULL;
3954 	int				 eos = view->nlines - 2;
3955 
3956 	if (s->first_displayed_entry == NULL)
3957 		return NULL;
3958 
3959 	if (s->thread_args.log_complete &&
3960 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3961 		return NULL;
3962 
3963 	if (view_is_hsplit_top(view))
3964 		--eos;  /* border consumes the last line */
3965 
3966 	if (!page) {
3967 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3968 			++s->selected;
3969 		else
3970 			err = log_scroll_down(view, 1);
3971 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3972 		struct commit_queue_entry *entry;
3973 		int n;
3974 
3975 		s->selected = 0;
3976 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3977 		s->last_displayed_entry = entry;
3978 		for (n = 0; n <= eos; n++) {
3979 			if (entry == NULL)
3980 				break;
3981 			s->first_displayed_entry = entry;
3982 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3983 		}
3984 		if (n > 0)
3985 			s->selected = n - 1;
3986 	} else {
3987 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3988 		    s->thread_args.log_complete)
3989 			s->selected += MIN(page,
3990 			    s->commits->ncommits - s->selected_entry->idx - 1);
3991 		else
3992 			err = log_scroll_down(view, page);
3993 	}
3994 	if (err)
3995 		return err;
3996 
3997 	/*
3998 	 * We might necessarily overshoot in horizontal
3999 	 * splits; if so, select the last displayed commit.
4000 	 */
4001 	if (s->first_displayed_entry && s->last_displayed_entry) {
4002 		s->selected = MIN(s->selected,
4003 		    s->last_displayed_entry->idx -
4004 		    s->first_displayed_entry->idx);
4005 	}
4006 
4007 	select_commit(s);
4008 
4009 	if (s->thread_args.log_complete &&
4010 	    s->selected_entry->idx == s->commits->ncommits - 1)
4011 		view->count = 0;
4012 
4013 	return NULL;
4014 }
4015 
4016 static void
4017 view_get_split(struct tog_view *view, int *y, int *x)
4018 {
4019 	*x = 0;
4020 	*y = 0;
4021 
4022 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4023 		if (view->child && view->child->resized_y)
4024 			*y = view->child->resized_y;
4025 		else if (view->resized_y)
4026 			*y = view->resized_y;
4027 		else
4028 			*y = view_split_begin_y(view->lines);
4029 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4030 		if (view->child && view->child->resized_x)
4031 			*x = view->child->resized_x;
4032 		else if (view->resized_x)
4033 			*x = view->resized_x;
4034 		else
4035 			*x = view_split_begin_x(view->begin_x);
4036 	}
4037 }
4038 
4039 /* Split view horizontally at y and offset view->state->selected line. */
4040 static const struct got_error *
4041 view_init_hsplit(struct tog_view *view, int y)
4042 {
4043 	const struct got_error *err = NULL;
4044 
4045 	view->nlines = y;
4046 	view->ncols = COLS;
4047 	err = view_resize(view);
4048 	if (err)
4049 		return err;
4050 
4051 	err = offset_selection_down(view);
4052 
4053 	return err;
4054 }
4055 
4056 static const struct got_error *
4057 log_goto_line(struct tog_view *view, int nlines)
4058 {
4059 	const struct got_error		*err = NULL;
4060 	struct tog_log_view_state	*s = &view->state.log;
4061 	int				 g, idx = s->selected_entry->idx;
4062 
4063 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4064 		return NULL;
4065 
4066 	g = view->gline;
4067 	view->gline = 0;
4068 
4069 	if (g >= s->first_displayed_entry->idx + 1 &&
4070 	    g <= s->last_displayed_entry->idx + 1 &&
4071 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4072 		s->selected = g - s->first_displayed_entry->idx - 1;
4073 		select_commit(s);
4074 		return NULL;
4075 	}
4076 
4077 	if (idx + 1 < g) {
4078 		err = log_move_cursor_down(view, g - idx - 1);
4079 		if (!err && g > s->selected_entry->idx + 1)
4080 			err = log_move_cursor_down(view,
4081 			    g - s->first_displayed_entry->idx - 1);
4082 		if (err)
4083 			return err;
4084 	} else if (idx + 1 > g)
4085 		log_move_cursor_up(view, idx - g + 1, 0);
4086 
4087 	if (g < nlines && s->first_displayed_entry->idx == 0)
4088 		s->selected = g - 1;
4089 
4090 	select_commit(s);
4091 	return NULL;
4092 
4093 }
4094 
4095 static void
4096 horizontal_scroll_input(struct tog_view *view, int ch)
4097 {
4098 
4099 	switch (ch) {
4100 	case KEY_LEFT:
4101 	case 'h':
4102 		view->x -= MIN(view->x, 2);
4103 		if (view->x <= 0)
4104 			view->count = 0;
4105 		break;
4106 	case KEY_RIGHT:
4107 	case 'l':
4108 		if (view->x + view->ncols / 2 < view->maxx)
4109 			view->x += 2;
4110 		else
4111 			view->count = 0;
4112 		break;
4113 	case '0':
4114 		view->x = 0;
4115 		break;
4116 	case '$':
4117 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4118 		view->count = 0;
4119 		break;
4120 	default:
4121 		break;
4122 	}
4123 }
4124 
4125 static const struct got_error *
4126 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4127 {
4128 	const struct got_error *err = NULL;
4129 	struct tog_log_view_state *s = &view->state.log;
4130 	int eos, nscroll;
4131 
4132 	if (s->thread_args.load_all) {
4133 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4134 			s->thread_args.load_all = 0;
4135 		else if (s->thread_args.log_complete) {
4136 			err = log_move_cursor_down(view, s->commits->ncommits);
4137 			s->thread_args.load_all = 0;
4138 		}
4139 		if (err)
4140 			return err;
4141 	}
4142 
4143 	eos = nscroll = view->nlines - 1;
4144 	if (view_is_hsplit_top(view))
4145 		--eos;  /* border */
4146 
4147 	if (view->gline)
4148 		return log_goto_line(view, eos);
4149 
4150 	switch (ch) {
4151 	case '&':
4152 		err = limit_log_view(view);
4153 		break;
4154 	case 'q':
4155 		s->quit = 1;
4156 		break;
4157 	case '0':
4158 	case '$':
4159 	case KEY_RIGHT:
4160 	case 'l':
4161 	case KEY_LEFT:
4162 	case 'h':
4163 		horizontal_scroll_input(view, ch);
4164 		break;
4165 	case 'k':
4166 	case KEY_UP:
4167 	case '<':
4168 	case ',':
4169 	case CTRL('p'):
4170 		log_move_cursor_up(view, 0, 0);
4171 		break;
4172 	case 'g':
4173 	case '=':
4174 	case KEY_HOME:
4175 		log_move_cursor_up(view, 0, 1);
4176 		view->count = 0;
4177 		break;
4178 	case CTRL('u'):
4179 	case 'u':
4180 		nscroll /= 2;
4181 		/* FALL THROUGH */
4182 	case KEY_PPAGE:
4183 	case CTRL('b'):
4184 	case 'b':
4185 		log_move_cursor_up(view, nscroll, 0);
4186 		break;
4187 	case 'j':
4188 	case KEY_DOWN:
4189 	case '>':
4190 	case '.':
4191 	case CTRL('n'):
4192 		err = log_move_cursor_down(view, 0);
4193 		break;
4194 	case '@':
4195 		s->use_committer = !s->use_committer;
4196 		view->action = s->use_committer ?
4197 		    "show committer" : "show commit author";
4198 		break;
4199 	case 'G':
4200 	case '*':
4201 	case KEY_END: {
4202 		/* We don't know yet how many commits, so we're forced to
4203 		 * traverse them all. */
4204 		view->count = 0;
4205 		s->thread_args.load_all = 1;
4206 		if (!s->thread_args.log_complete)
4207 			return trigger_log_thread(view, 0);
4208 		err = log_move_cursor_down(view, s->commits->ncommits);
4209 		s->thread_args.load_all = 0;
4210 		break;
4211 	}
4212 	case CTRL('d'):
4213 	case 'd':
4214 		nscroll /= 2;
4215 		/* FALL THROUGH */
4216 	case KEY_NPAGE:
4217 	case CTRL('f'):
4218 	case 'f':
4219 	case ' ':
4220 		err = log_move_cursor_down(view, nscroll);
4221 		break;
4222 	case KEY_RESIZE:
4223 		if (s->selected > view->nlines - 2)
4224 			s->selected = view->nlines - 2;
4225 		if (s->selected > s->commits->ncommits - 1)
4226 			s->selected = s->commits->ncommits - 1;
4227 		select_commit(s);
4228 		if (s->commits->ncommits < view->nlines - 1 &&
4229 		    !s->thread_args.log_complete) {
4230 			s->thread_args.commits_needed += (view->nlines - 1) -
4231 			    s->commits->ncommits;
4232 			err = trigger_log_thread(view, 1);
4233 		}
4234 		break;
4235 	case KEY_ENTER:
4236 	case '\r':
4237 		view->count = 0;
4238 		if (s->selected_entry == NULL)
4239 			break;
4240 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4241 		break;
4242 	case 'T':
4243 		view->count = 0;
4244 		if (s->selected_entry == NULL)
4245 			break;
4246 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4247 		break;
4248 	case KEY_BACKSPACE:
4249 	case CTRL('l'):
4250 	case 'B':
4251 		view->count = 0;
4252 		if (ch == KEY_BACKSPACE &&
4253 		    got_path_is_root_dir(s->in_repo_path))
4254 			break;
4255 		err = stop_log_thread(s);
4256 		if (err)
4257 			return err;
4258 		if (ch == KEY_BACKSPACE) {
4259 			char *parent_path;
4260 			err = got_path_dirname(&parent_path, s->in_repo_path);
4261 			if (err)
4262 				return err;
4263 			free(s->in_repo_path);
4264 			s->in_repo_path = parent_path;
4265 			s->thread_args.in_repo_path = s->in_repo_path;
4266 		} else if (ch == CTRL('l')) {
4267 			struct got_object_id *start_id;
4268 			err = got_repo_match_object_id(&start_id, NULL,
4269 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4270 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4271 			if (err) {
4272 				if (s->head_ref_name == NULL ||
4273 				    err->code != GOT_ERR_NOT_REF)
4274 					return err;
4275 				/* Try to cope with deleted references. */
4276 				free(s->head_ref_name);
4277 				s->head_ref_name = NULL;
4278 				err = got_repo_match_object_id(&start_id,
4279 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4280 				    &tog_refs, s->repo);
4281 				if (err)
4282 					return err;
4283 			}
4284 			free(s->start_id);
4285 			s->start_id = start_id;
4286 			s->thread_args.start_id = s->start_id;
4287 		} else /* 'B' */
4288 			s->log_branches = !s->log_branches;
4289 
4290 		if (s->thread_args.pack_fds == NULL) {
4291 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4292 			if (err)
4293 				return err;
4294 		}
4295 		err = got_repo_open(&s->thread_args.repo,
4296 		    got_repo_get_path(s->repo), NULL,
4297 		    s->thread_args.pack_fds);
4298 		if (err)
4299 			return err;
4300 		tog_free_refs();
4301 		err = tog_load_refs(s->repo, 0);
4302 		if (err)
4303 			return err;
4304 		err = got_commit_graph_open(&s->thread_args.graph,
4305 		    s->in_repo_path, !s->log_branches);
4306 		if (err)
4307 			return err;
4308 		err = got_commit_graph_iter_start(s->thread_args.graph,
4309 		    s->start_id, s->repo, NULL, NULL);
4310 		if (err)
4311 			return err;
4312 		free_commits(&s->real_commits);
4313 		free_commits(&s->limit_commits);
4314 		s->first_displayed_entry = NULL;
4315 		s->last_displayed_entry = NULL;
4316 		s->selected_entry = NULL;
4317 		s->selected = 0;
4318 		s->thread_args.log_complete = 0;
4319 		s->quit = 0;
4320 		s->thread_args.commits_needed = view->lines;
4321 		s->matched_entry = NULL;
4322 		s->search_entry = NULL;
4323 		view->offset = 0;
4324 		break;
4325 	case 'R':
4326 		view->count = 0;
4327 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4328 		break;
4329 	default:
4330 		view->count = 0;
4331 		break;
4332 	}
4333 
4334 	return err;
4335 }
4336 
4337 static const struct got_error *
4338 apply_unveil(const char *repo_path, const char *worktree_path)
4339 {
4340 	const struct got_error *error;
4341 
4342 #ifdef PROFILE
4343 	if (unveil("gmon.out", "rwc") != 0)
4344 		return got_error_from_errno2("unveil", "gmon.out");
4345 #endif
4346 	if (repo_path && unveil(repo_path, "r") != 0)
4347 		return got_error_from_errno2("unveil", repo_path);
4348 
4349 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4350 		return got_error_from_errno2("unveil", worktree_path);
4351 
4352 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4353 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4354 
4355 	error = got_privsep_unveil_exec_helpers();
4356 	if (error != NULL)
4357 		return error;
4358 
4359 	if (unveil(NULL, NULL) != 0)
4360 		return got_error_from_errno("unveil");
4361 
4362 	return NULL;
4363 }
4364 
4365 static const struct got_error *
4366 init_mock_term(const char *test_script_path)
4367 {
4368 	const struct got_error	*err = NULL;
4369 	const char *screen_dump_path;
4370 	int in;
4371 
4372 	if (test_script_path == NULL || *test_script_path == '\0')
4373 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4374 
4375 	tog_io.f = fopen(test_script_path, "re");
4376 	if (tog_io.f == NULL) {
4377 		err = got_error_from_errno_fmt("fopen: %s",
4378 		    test_script_path);
4379 		goto done;
4380 	}
4381 
4382 	/* test mode, we don't want any output */
4383 	tog_io.cout = fopen("/dev/null", "w+");
4384 	if (tog_io.cout == NULL) {
4385 		err = got_error_from_errno2("fopen", "/dev/null");
4386 		goto done;
4387 	}
4388 
4389 	in = dup(fileno(tog_io.cout));
4390 	if (in == -1) {
4391 		err = got_error_from_errno("dup");
4392 		goto done;
4393 	}
4394 	tog_io.cin = fdopen(in, "r");
4395 	if (tog_io.cin == NULL) {
4396 		err = got_error_from_errno("fdopen");
4397 		close(in);
4398 		goto done;
4399 	}
4400 
4401 	screen_dump_path = getenv("TOG_SCR_DUMP");
4402 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4403 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4404 	tog_io.sdump = fopen(screen_dump_path, "we");
4405 	if (tog_io.sdump == NULL) {
4406 		err = got_error_from_errno2("fopen", screen_dump_path);
4407 		goto done;
4408 	}
4409 
4410 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4411 		err = got_error_from_errno("fseeko");
4412 		goto done;
4413 	}
4414 
4415 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4416 		err = got_error_msg(GOT_ERR_IO,
4417 		    "newterm: failed to initialise curses");
4418 
4419 	using_mock_io = 1;
4420 
4421 done:
4422 	if (err)
4423 		tog_io_close();
4424 	return err;
4425 }
4426 
4427 static void
4428 init_curses(void)
4429 {
4430 	if (using_mock_io) /* In test mode we use a fake terminal */
4431 		return;
4432 
4433 	initscr();
4434 
4435 	cbreak();
4436 	halfdelay(1); /* Fast refresh while initial view is loading. */
4437 	noecho();
4438 	nonl();
4439 	intrflush(stdscr, FALSE);
4440 	keypad(stdscr, TRUE);
4441 	curs_set(0);
4442 	if (getenv("TOG_COLORS") != NULL) {
4443 		start_color();
4444 		use_default_colors();
4445 	}
4446 
4447 	return;
4448 }
4449 
4450 static const struct got_error *
4451 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4452 {
4453 	tog_base_commit.id = got_object_id_dup(
4454 	    got_worktree_get_base_commit_id(worktree));
4455 	if (tog_base_commit.id == NULL)
4456 		return got_error_from_errno( "got_object_id_dup");
4457 
4458 	return NULL;
4459 }
4460 
4461 static const struct got_error *
4462 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4463     struct got_repository *repo, struct got_worktree *worktree)
4464 {
4465 	const struct got_error *err = NULL;
4466 
4467 	if (argc == 0) {
4468 		*in_repo_path = strdup("/");
4469 		if (*in_repo_path == NULL)
4470 			return got_error_from_errno("strdup");
4471 		return NULL;
4472 	}
4473 
4474 	if (worktree) {
4475 		const char *prefix = got_worktree_get_path_prefix(worktree);
4476 		char *p;
4477 
4478 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4479 		if (err)
4480 			return err;
4481 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4482 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4483 		    p) == -1) {
4484 			err = got_error_from_errno("asprintf");
4485 			*in_repo_path = NULL;
4486 		}
4487 		free(p);
4488 	} else
4489 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4490 
4491 	return err;
4492 }
4493 
4494 static const struct got_error *
4495 cmd_log(int argc, char *argv[])
4496 {
4497 	const struct got_error *error;
4498 	struct got_repository *repo = NULL;
4499 	struct got_worktree *worktree = NULL;
4500 	struct got_object_id *start_id = NULL;
4501 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4502 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4503 	struct got_reference *ref = NULL;
4504 	const char *head_ref_name = NULL;
4505 	int ch, log_branches = 0;
4506 	struct tog_view *view;
4507 	int *pack_fds = NULL;
4508 
4509 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4510 		switch (ch) {
4511 		case 'b':
4512 			log_branches = 1;
4513 			break;
4514 		case 'c':
4515 			start_commit = optarg;
4516 			break;
4517 		case 'r':
4518 			repo_path = realpath(optarg, NULL);
4519 			if (repo_path == NULL)
4520 				return got_error_from_errno2("realpath",
4521 				    optarg);
4522 			break;
4523 		default:
4524 			usage_log();
4525 			/* NOTREACHED */
4526 		}
4527 	}
4528 
4529 	argc -= optind;
4530 	argv += optind;
4531 
4532 	if (argc > 1)
4533 		usage_log();
4534 
4535 	error = got_repo_pack_fds_open(&pack_fds);
4536 	if (error != NULL)
4537 		goto done;
4538 
4539 	if (repo_path == NULL) {
4540 		cwd = getcwd(NULL, 0);
4541 		if (cwd == NULL) {
4542 			error = got_error_from_errno("getcwd");
4543 			goto done;
4544 		}
4545 		error = got_worktree_open(&worktree, cwd, NULL);
4546 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4547 			goto done;
4548 		if (worktree)
4549 			repo_path =
4550 			    strdup(got_worktree_get_repo_path(worktree));
4551 		else
4552 			repo_path = strdup(cwd);
4553 		if (repo_path == NULL) {
4554 			error = got_error_from_errno("strdup");
4555 			goto done;
4556 		}
4557 	}
4558 
4559 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4560 	if (error != NULL)
4561 		goto done;
4562 
4563 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4564 	    repo, worktree);
4565 	if (error)
4566 		goto done;
4567 
4568 	init_curses();
4569 
4570 	error = apply_unveil(got_repo_get_path(repo),
4571 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4572 	if (error)
4573 		goto done;
4574 
4575 	/* already loaded by tog_log_with_path()? */
4576 	if (TAILQ_EMPTY(&tog_refs)) {
4577 		error = tog_load_refs(repo, 0);
4578 		if (error)
4579 			goto done;
4580 	}
4581 
4582 	if (start_commit == NULL) {
4583 		error = got_repo_match_object_id(&start_id, &label,
4584 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4585 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4586 		if (error)
4587 			goto done;
4588 		head_ref_name = label;
4589 	} else {
4590 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4591 		    repo, worktree);
4592 		if (error != NULL)
4593 			goto done;
4594 		if (keyword_idstr != NULL)
4595 			start_commit = keyword_idstr;
4596 
4597 		error = got_ref_open(&ref, repo, start_commit, 0);
4598 		if (error == NULL)
4599 			head_ref_name = got_ref_get_name(ref);
4600 		else if (error->code != GOT_ERR_NOT_REF)
4601 			goto done;
4602 		error = got_repo_match_object_id(&start_id, NULL,
4603 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4604 		if (error)
4605 			goto done;
4606 	}
4607 
4608 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4609 	if (view == NULL) {
4610 		error = got_error_from_errno("view_open");
4611 		goto done;
4612 	}
4613 
4614 	if (worktree) {
4615 		error = set_tog_base_commit(repo, worktree);
4616 		if (error != NULL)
4617 			goto done;
4618 	}
4619 
4620 	error = open_log_view(view, start_id, repo, head_ref_name,
4621 	    in_repo_path, log_branches, worktree);
4622 	if (error)
4623 		goto done;
4624 
4625 	if (worktree) {
4626 		/* The work tree will be closed by the log thread. */
4627 		worktree = NULL;
4628 	}
4629 
4630 	error = view_loop(view);
4631 
4632 done:
4633 	free(tog_base_commit.id);
4634 	free(keyword_idstr);
4635 	free(in_repo_path);
4636 	free(repo_path);
4637 	free(cwd);
4638 	free(start_id);
4639 	free(label);
4640 	if (ref)
4641 		got_ref_close(ref);
4642 	if (repo) {
4643 		const struct got_error *close_err = got_repo_close(repo);
4644 		if (error == NULL)
4645 			error = close_err;
4646 	}
4647 	if (worktree)
4648 		got_worktree_close(worktree);
4649 	if (pack_fds) {
4650 		const struct got_error *pack_err =
4651 		    got_repo_pack_fds_close(pack_fds);
4652 		if (error == NULL)
4653 			error = pack_err;
4654 	}
4655 	tog_free_refs();
4656 	return error;
4657 }
4658 
4659 __dead static void
4660 usage_diff(void)
4661 {
4662 	endwin();
4663 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4664 	    "object1 object2\n", getprogname());
4665 	exit(1);
4666 }
4667 
4668 static int
4669 match_line(const char *line, regex_t *regex, size_t nmatch,
4670     regmatch_t *regmatch)
4671 {
4672 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4673 }
4674 
4675 static struct tog_color *
4676 match_color(struct tog_colors *colors, const char *line)
4677 {
4678 	struct tog_color *tc = NULL;
4679 
4680 	STAILQ_FOREACH(tc, colors, entry) {
4681 		if (match_line(line, &tc->regex, 0, NULL))
4682 			return tc;
4683 	}
4684 
4685 	return NULL;
4686 }
4687 
4688 static const struct got_error *
4689 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4690     WINDOW *window, int skipcol, regmatch_t *regmatch)
4691 {
4692 	const struct got_error *err = NULL;
4693 	char *exstr = NULL;
4694 	wchar_t *wline = NULL;
4695 	int rme, rms, n, width, scrollx;
4696 	int width0 = 0, width1 = 0, width2 = 0;
4697 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4698 
4699 	*wtotal = 0;
4700 
4701 	rms = regmatch->rm_so;
4702 	rme = regmatch->rm_eo;
4703 
4704 	err = expand_tab(&exstr, line);
4705 	if (err)
4706 		return err;
4707 
4708 	/* Split the line into 3 segments, according to match offsets. */
4709 	seg0 = strndup(exstr, rms);
4710 	if (seg0 == NULL) {
4711 		err = got_error_from_errno("strndup");
4712 		goto done;
4713 	}
4714 	seg1 = strndup(exstr + rms, rme - rms);
4715 	if (seg1 == NULL) {
4716 		err = got_error_from_errno("strndup");
4717 		goto done;
4718 	}
4719 	seg2 = strdup(exstr + rme);
4720 	if (seg2 == NULL) {
4721 		err = got_error_from_errno("strndup");
4722 		goto done;
4723 	}
4724 
4725 	/* draw up to matched token if we haven't scrolled past it */
4726 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4727 	    col_tab_align, 1);
4728 	if (err)
4729 		goto done;
4730 	n = MAX(width0 - skipcol, 0);
4731 	if (n) {
4732 		free(wline);
4733 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4734 		    wlimit, col_tab_align, 1);
4735 		if (err)
4736 			goto done;
4737 		waddwstr(window, &wline[scrollx]);
4738 		wlimit -= width;
4739 		*wtotal += width;
4740 	}
4741 
4742 	if (wlimit > 0) {
4743 		int i = 0, w = 0;
4744 		size_t wlen;
4745 
4746 		free(wline);
4747 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4748 		    col_tab_align, 1);
4749 		if (err)
4750 			goto done;
4751 		wlen = wcslen(wline);
4752 		while (i < wlen) {
4753 			width = wcwidth(wline[i]);
4754 			if (width == -1) {
4755 				/* should not happen, tabs are expanded */
4756 				err = got_error(GOT_ERR_RANGE);
4757 				goto done;
4758 			}
4759 			if (width0 + w + width > skipcol)
4760 				break;
4761 			w += width;
4762 			i++;
4763 		}
4764 		/* draw (visible part of) matched token (if scrolled into it) */
4765 		if (width1 - w > 0) {
4766 			wattron(window, A_STANDOUT);
4767 			waddwstr(window, &wline[i]);
4768 			wattroff(window, A_STANDOUT);
4769 			wlimit -= (width1 - w);
4770 			*wtotal += (width1 - w);
4771 		}
4772 	}
4773 
4774 	if (wlimit > 0) {  /* draw rest of line */
4775 		free(wline);
4776 		if (skipcol > width0 + width1) {
4777 			err = format_line(&wline, &width2, &scrollx, seg2,
4778 			    skipcol - (width0 + width1), wlimit,
4779 			    col_tab_align, 1);
4780 			if (err)
4781 				goto done;
4782 			waddwstr(window, &wline[scrollx]);
4783 		} else {
4784 			err = format_line(&wline, &width2, NULL, seg2, 0,
4785 			    wlimit, col_tab_align, 1);
4786 			if (err)
4787 				goto done;
4788 			waddwstr(window, wline);
4789 		}
4790 		*wtotal += width2;
4791 	}
4792 done:
4793 	free(wline);
4794 	free(exstr);
4795 	free(seg0);
4796 	free(seg1);
4797 	free(seg2);
4798 	return err;
4799 }
4800 
4801 static int
4802 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4803 {
4804 	FILE	*f = NULL;
4805 	int	*eof, *first, *selected;
4806 
4807 	if (view->type == TOG_VIEW_DIFF) {
4808 		struct tog_diff_view_state *s = &view->state.diff;
4809 
4810 		first = &s->first_displayed_line;
4811 		selected = first;
4812 		eof = &s->eof;
4813 		f = s->f;
4814 	} else if (view->type == TOG_VIEW_HELP) {
4815 		struct tog_help_view_state *s = &view->state.help;
4816 
4817 		first = &s->first_displayed_line;
4818 		selected = first;
4819 		eof = &s->eof;
4820 		f = s->f;
4821 	} else if (view->type == TOG_VIEW_BLAME) {
4822 		struct tog_blame_view_state *s = &view->state.blame;
4823 
4824 		first = &s->first_displayed_line;
4825 		selected = &s->selected_line;
4826 		eof = &s->eof;
4827 		f = s->blame.f;
4828 	} else
4829 		return 0;
4830 
4831 	/* Center gline in the middle of the page like vi(1). */
4832 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4833 		return 0;
4834 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4835 		rewind(f);
4836 		*eof = 0;
4837 		*first = 1;
4838 		*lineno = 0;
4839 		*nprinted = 0;
4840 		return 0;
4841 	}
4842 
4843 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4844 		view->gline : (view->nlines - 3) / 2 + 1;
4845 	view->gline = 0;
4846 
4847 	return 1;
4848 }
4849 
4850 static const struct got_error *
4851 draw_file(struct tog_view *view, const char *header)
4852 {
4853 	struct tog_diff_view_state *s = &view->state.diff;
4854 	regmatch_t *regmatch = &view->regmatch;
4855 	const struct got_error *err;
4856 	int nprinted = 0;
4857 	char *line;
4858 	size_t linesize = 0;
4859 	ssize_t linelen;
4860 	wchar_t *wline;
4861 	int width;
4862 	int max_lines = view->nlines;
4863 	int nlines = s->nlines;
4864 	off_t line_offset;
4865 
4866 	s->lineno = s->first_displayed_line - 1;
4867 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4868 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4869 		return got_error_from_errno("fseek");
4870 
4871 	werase(view->window);
4872 
4873 	if (view->gline > s->nlines - 1)
4874 		view->gline = s->nlines - 1;
4875 
4876 	if (header) {
4877 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4878 		    1 : view->gline - (view->nlines - 3) / 2 :
4879 		    s->lineno + s->selected_line;
4880 
4881 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4882 			return got_error_from_errno("asprintf");
4883 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4884 		    0, 0);
4885 		free(line);
4886 		if (err)
4887 			return err;
4888 
4889 		if (view_needs_focus_indication(view))
4890 			wstandout(view->window);
4891 		waddwstr(view->window, wline);
4892 		free(wline);
4893 		wline = NULL;
4894 		while (width++ < view->ncols)
4895 			waddch(view->window, ' ');
4896 		if (view_needs_focus_indication(view))
4897 			wstandend(view->window);
4898 
4899 		if (max_lines <= 1)
4900 			return NULL;
4901 		max_lines--;
4902 	}
4903 
4904 	s->eof = 0;
4905 	view->maxx = 0;
4906 	line = NULL;
4907 	while (max_lines > 0 && nprinted < max_lines) {
4908 		enum got_diff_line_type linetype;
4909 		attr_t attr = 0;
4910 
4911 		linelen = getline(&line, &linesize, s->f);
4912 		if (linelen == -1) {
4913 			if (feof(s->f)) {
4914 				s->eof = 1;
4915 				break;
4916 			}
4917 			free(line);
4918 			return got_ferror(s->f, GOT_ERR_IO);
4919 		}
4920 
4921 		if (++s->lineno < s->first_displayed_line)
4922 			continue;
4923 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4924 			continue;
4925 		if (s->lineno == view->hiline)
4926 			attr = A_STANDOUT;
4927 
4928 		/* Set view->maxx based on full line length. */
4929 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4930 		    view->x ? 1 : 0);
4931 		if (err) {
4932 			free(line);
4933 			return err;
4934 		}
4935 		view->maxx = MAX(view->maxx, width);
4936 		free(wline);
4937 		wline = NULL;
4938 
4939 		linetype = s->lines[s->lineno].type;
4940 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4941 		    linetype < GOT_DIFF_LINE_CONTEXT)
4942 			attr |= COLOR_PAIR(linetype);
4943 		if (attr)
4944 			wattron(view->window, attr);
4945 		if (s->first_displayed_line + nprinted == s->matched_line &&
4946 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4947 			err = add_matched_line(&width, line, view->ncols, 0,
4948 			    view->window, view->x, regmatch);
4949 			if (err) {
4950 				free(line);
4951 				return err;
4952 			}
4953 		} else {
4954 			int skip;
4955 			err = format_line(&wline, &width, &skip, line,
4956 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4957 			if (err) {
4958 				free(line);
4959 				return err;
4960 			}
4961 			waddwstr(view->window, &wline[skip]);
4962 			free(wline);
4963 			wline = NULL;
4964 		}
4965 		if (s->lineno == view->hiline) {
4966 			/* highlight full gline length */
4967 			while (width++ < view->ncols)
4968 				waddch(view->window, ' ');
4969 		} else {
4970 			if (width <= view->ncols - 1)
4971 				waddch(view->window, '\n');
4972 		}
4973 		if (attr)
4974 			wattroff(view->window, attr);
4975 		if (++nprinted == 1)
4976 			s->first_displayed_line = s->lineno;
4977 	}
4978 	free(line);
4979 	if (nprinted >= 1)
4980 		s->last_displayed_line = s->first_displayed_line +
4981 		    (nprinted - 1);
4982 	else
4983 		s->last_displayed_line = s->first_displayed_line;
4984 
4985 	view_border(view);
4986 
4987 	if (s->eof) {
4988 		while (nprinted < view->nlines) {
4989 			waddch(view->window, '\n');
4990 			nprinted++;
4991 		}
4992 
4993 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4994 		    view->ncols, 0, 0);
4995 		if (err) {
4996 			return err;
4997 		}
4998 
4999 		wstandout(view->window);
5000 		waddwstr(view->window, wline);
5001 		free(wline);
5002 		wline = NULL;
5003 		wstandend(view->window);
5004 	}
5005 
5006 	return NULL;
5007 }
5008 
5009 static char *
5010 get_datestr(time_t *time, char *datebuf)
5011 {
5012 	struct tm mytm, *tm;
5013 	char *p, *s;
5014 
5015 	tm = gmtime_r(time, &mytm);
5016 	if (tm == NULL)
5017 		return NULL;
5018 	s = asctime_r(tm, datebuf);
5019 	if (s == NULL)
5020 		return NULL;
5021 	p = strchr(s, '\n');
5022 	if (p)
5023 		*p = '\0';
5024 	return s;
5025 }
5026 
5027 static const struct got_error *
5028 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5029     off_t off, uint8_t type)
5030 {
5031 	struct got_diff_line *p;
5032 
5033 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5034 	if (p == NULL)
5035 		return got_error_from_errno("reallocarray");
5036 	*lines = p;
5037 	(*lines)[*nlines].offset = off;
5038 	(*lines)[*nlines].type = type;
5039 	(*nlines)++;
5040 
5041 	return NULL;
5042 }
5043 
5044 static const struct got_error *
5045 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5046     struct got_diff_line *s_lines, size_t s_nlines)
5047 {
5048 	struct got_diff_line	*p;
5049 	char			 buf[BUFSIZ];
5050 	size_t			 i, r;
5051 
5052 	if (fseeko(src, 0L, SEEK_SET) == -1)
5053 		return got_error_from_errno("fseeko");
5054 
5055 	for (;;) {
5056 		r = fread(buf, 1, sizeof(buf), src);
5057 		if (r == 0) {
5058 			if (ferror(src))
5059 				return got_error_from_errno("fread");
5060 			if (feof(src))
5061 				break;
5062 		}
5063 		if (fwrite(buf, 1, r, dst) != r)
5064 			return got_ferror(dst, GOT_ERR_IO);
5065 	}
5066 
5067 	if (s_nlines == 0 && *d_nlines == 0)
5068 		return NULL;
5069 
5070 	/*
5071 	 * If commit info was in dst, increment line offsets
5072 	 * of the appended diff content, but skip s_lines[0]
5073 	 * because offset zero is already in *d_lines.
5074 	 */
5075 	if (*d_nlines > 0) {
5076 		for (i = 1; i < s_nlines; ++i)
5077 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5078 
5079 		if (s_nlines > 0) {
5080 			--s_nlines;
5081 			++s_lines;
5082 		}
5083 	}
5084 
5085 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5086 	if (p == NULL) {
5087 		/* d_lines is freed in close_diff_view() */
5088 		return got_error_from_errno("reallocarray");
5089 	}
5090 
5091 	*d_lines = p;
5092 
5093 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5094 	*d_nlines += s_nlines;
5095 
5096 	return NULL;
5097 }
5098 
5099 static const struct got_error *
5100 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5101     struct got_object_id *commit_id, struct got_reflist_head *refs,
5102     struct got_repository *repo, int ignore_ws, int force_text_diff,
5103     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5104 {
5105 	const struct got_error *err = NULL;
5106 	char datebuf[26], *datestr;
5107 	struct got_commit_object *commit;
5108 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5109 	time_t committer_time;
5110 	const char *author, *committer;
5111 	char *refs_str = NULL;
5112 	struct got_pathlist_entry *pe;
5113 	off_t outoff = 0;
5114 	int n;
5115 
5116 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5117 	if (err)
5118 		return err;
5119 
5120 	err = got_object_open_as_commit(&commit, repo, commit_id);
5121 	if (err)
5122 		return err;
5123 
5124 	err = got_object_id_str(&id_str, commit_id);
5125 	if (err) {
5126 		err = got_error_from_errno("got_object_id_str");
5127 		goto done;
5128 	}
5129 
5130 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5131 	if (err)
5132 		goto done;
5133 
5134 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5135 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5136 	if (n < 0) {
5137 		err = got_error_from_errno("fprintf");
5138 		goto done;
5139 	}
5140 	outoff += n;
5141 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5142 	if (err)
5143 		goto done;
5144 
5145 	n = fprintf(outfile, "from: %s\n",
5146 	    got_object_commit_get_author(commit));
5147 	if (n < 0) {
5148 		err = got_error_from_errno("fprintf");
5149 		goto done;
5150 	}
5151 	outoff += n;
5152 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5153 	if (err)
5154 		goto done;
5155 
5156 	author = got_object_commit_get_author(commit);
5157 	committer = got_object_commit_get_committer(commit);
5158 	if (strcmp(author, committer) != 0) {
5159 		n = fprintf(outfile, "via: %s\n", committer);
5160 		if (n < 0) {
5161 			err = got_error_from_errno("fprintf");
5162 			goto done;
5163 		}
5164 		outoff += n;
5165 		err = add_line_metadata(lines, nlines, outoff,
5166 		    GOT_DIFF_LINE_AUTHOR);
5167 		if (err)
5168 			goto done;
5169 	}
5170 	committer_time = got_object_commit_get_committer_time(commit);
5171 	datestr = get_datestr(&committer_time, datebuf);
5172 	if (datestr) {
5173 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5174 		if (n < 0) {
5175 			err = got_error_from_errno("fprintf");
5176 			goto done;
5177 		}
5178 		outoff += n;
5179 		err = add_line_metadata(lines, nlines, outoff,
5180 		    GOT_DIFF_LINE_DATE);
5181 		if (err)
5182 			goto done;
5183 	}
5184 	if (got_object_commit_get_nparents(commit) > 1) {
5185 		const struct got_object_id_queue *parent_ids;
5186 		struct got_object_qid *qid;
5187 		int pn = 1;
5188 		parent_ids = got_object_commit_get_parent_ids(commit);
5189 		STAILQ_FOREACH(qid, parent_ids, entry) {
5190 			err = got_object_id_str(&id_str, &qid->id);
5191 			if (err)
5192 				goto done;
5193 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5194 			if (n < 0) {
5195 				err = got_error_from_errno("fprintf");
5196 				goto done;
5197 			}
5198 			outoff += n;
5199 			err = add_line_metadata(lines, nlines, outoff,
5200 			    GOT_DIFF_LINE_META);
5201 			if (err)
5202 				goto done;
5203 			free(id_str);
5204 			id_str = NULL;
5205 		}
5206 	}
5207 
5208 	err = got_object_commit_get_logmsg(&logmsg, commit);
5209 	if (err)
5210 		goto done;
5211 	s = logmsg;
5212 	while ((line = strsep(&s, "\n")) != NULL) {
5213 		n = fprintf(outfile, "%s\n", line);
5214 		if (n < 0) {
5215 			err = got_error_from_errno("fprintf");
5216 			goto done;
5217 		}
5218 		outoff += n;
5219 		err = add_line_metadata(lines, nlines, outoff,
5220 		    GOT_DIFF_LINE_LOGMSG);
5221 		if (err)
5222 			goto done;
5223 	}
5224 
5225 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5226 		struct got_diff_changed_path *cp = pe->data;
5227 		int pad = dsa->max_path_len - pe->path_len + 1;
5228 
5229 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5230 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5231 		    dsa->rm_cols + 1, cp->rm);
5232 		if (n < 0) {
5233 			err = got_error_from_errno("fprintf");
5234 			goto done;
5235 		}
5236 		outoff += n;
5237 		err = add_line_metadata(lines, nlines, outoff,
5238 		    GOT_DIFF_LINE_CHANGES);
5239 		if (err)
5240 			goto done;
5241 	}
5242 
5243 	fputc('\n', outfile);
5244 	outoff++;
5245 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5246 	if (err)
5247 		goto done;
5248 
5249 	n = fprintf(outfile,
5250 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5251 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5252 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5253 	if (n < 0) {
5254 		err = got_error_from_errno("fprintf");
5255 		goto done;
5256 	}
5257 	outoff += n;
5258 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5259 	if (err)
5260 		goto done;
5261 
5262 	fputc('\n', outfile);
5263 	outoff++;
5264 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5265 done:
5266 	free(id_str);
5267 	free(logmsg);
5268 	free(refs_str);
5269 	got_object_commit_close(commit);
5270 	if (err) {
5271 		free(*lines);
5272 		*lines = NULL;
5273 		*nlines = 0;
5274 	}
5275 	return err;
5276 }
5277 
5278 static const struct got_error *
5279 create_diff(struct tog_diff_view_state *s)
5280 {
5281 	const struct got_error *err = NULL;
5282 	FILE *f = NULL, *tmp_diff_file = NULL;
5283 	int obj_type;
5284 	struct got_diff_line *lines = NULL;
5285 	struct got_pathlist_head changed_paths;
5286 
5287 	TAILQ_INIT(&changed_paths);
5288 
5289 	free(s->lines);
5290 	s->lines = malloc(sizeof(*s->lines));
5291 	if (s->lines == NULL)
5292 		return got_error_from_errno("malloc");
5293 	s->nlines = 0;
5294 
5295 	f = got_opentemp();
5296 	if (f == NULL) {
5297 		err = got_error_from_errno("got_opentemp");
5298 		goto done;
5299 	}
5300 	tmp_diff_file = got_opentemp();
5301 	if (tmp_diff_file == NULL) {
5302 		err = got_error_from_errno("got_opentemp");
5303 		goto done;
5304 	}
5305 	if (s->f && fclose(s->f) == EOF) {
5306 		err = got_error_from_errno("fclose");
5307 		goto done;
5308 	}
5309 	s->f = f;
5310 
5311 	if (s->id1)
5312 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5313 	else
5314 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5315 	if (err)
5316 		goto done;
5317 
5318 	switch (obj_type) {
5319 	case GOT_OBJ_TYPE_BLOB:
5320 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5321 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5322 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5323 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5324 		    s->f);
5325 		break;
5326 	case GOT_OBJ_TYPE_TREE:
5327 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5328 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5329 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5330 		    s->force_text_diff, NULL, s->repo, s->f);
5331 		break;
5332 	case GOT_OBJ_TYPE_COMMIT: {
5333 		const struct got_object_id_queue *parent_ids;
5334 		struct got_object_qid *pid;
5335 		struct got_commit_object *commit2;
5336 		struct got_reflist_head *refs;
5337 		size_t nlines = 0;
5338 		struct got_diffstat_cb_arg dsa = {
5339 			0, 0, 0, 0, 0, 0,
5340 			&changed_paths,
5341 			s->ignore_whitespace,
5342 			s->force_text_diff,
5343 			tog_diff_algo
5344 		};
5345 
5346 		lines = malloc(sizeof(*lines));
5347 		if (lines == NULL) {
5348 			err = got_error_from_errno("malloc");
5349 			goto done;
5350 		}
5351 
5352 		/* build diff first in tmp file then append to commit info */
5353 		err = got_diff_objects_as_commits(&lines, &nlines,
5354 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5355 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5356 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5357 		if (err)
5358 			break;
5359 
5360 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5361 		if (err)
5362 			goto done;
5363 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5364 		/* Show commit info if we're diffing to a parent/root commit. */
5365 		if (s->id1 == NULL) {
5366 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5367 			    refs, s->repo, s->ignore_whitespace,
5368 			    s->force_text_diff, &dsa, s->f);
5369 			if (err)
5370 				goto done;
5371 		} else {
5372 			parent_ids = got_object_commit_get_parent_ids(commit2);
5373 			STAILQ_FOREACH(pid, parent_ids, entry) {
5374 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5375 					err = write_commit_info(&s->lines,
5376 					    &s->nlines, s->id2, refs, s->repo,
5377 					    s->ignore_whitespace,
5378 					    s->force_text_diff, &dsa, s->f);
5379 					if (err)
5380 						goto done;
5381 					break;
5382 				}
5383 			}
5384 		}
5385 		got_object_commit_close(commit2);
5386 
5387 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5388 		    lines, nlines);
5389 		break;
5390 	}
5391 	default:
5392 		err = got_error(GOT_ERR_OBJ_TYPE);
5393 		break;
5394 	}
5395 done:
5396 	free(lines);
5397 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5398 	if (s->f && fflush(s->f) != 0 && err == NULL)
5399 		err = got_error_from_errno("fflush");
5400 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5401 		err = got_error_from_errno("fclose");
5402 	return err;
5403 }
5404 
5405 static void
5406 diff_view_indicate_progress(struct tog_view *view)
5407 {
5408 	mvwaddstr(view->window, 0, 0, "diffing...");
5409 	update_panels();
5410 	doupdate();
5411 }
5412 
5413 static const struct got_error *
5414 search_start_diff_view(struct tog_view *view)
5415 {
5416 	struct tog_diff_view_state *s = &view->state.diff;
5417 
5418 	s->matched_line = 0;
5419 	return NULL;
5420 }
5421 
5422 static void
5423 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5424     size_t *nlines, int **first, int **last, int **match, int **selected)
5425 {
5426 	struct tog_diff_view_state *s = &view->state.diff;
5427 
5428 	*f = s->f;
5429 	*nlines = s->nlines;
5430 	*line_offsets = NULL;
5431 	*match = &s->matched_line;
5432 	*first = &s->first_displayed_line;
5433 	*last = &s->last_displayed_line;
5434 	*selected = &s->selected_line;
5435 }
5436 
5437 static const struct got_error *
5438 search_next_view_match(struct tog_view *view)
5439 {
5440 	const struct got_error *err = NULL;
5441 	FILE *f;
5442 	int lineno;
5443 	char *line = NULL;
5444 	size_t linesize = 0;
5445 	ssize_t linelen;
5446 	off_t *line_offsets;
5447 	size_t nlines = 0;
5448 	int *first, *last, *match, *selected;
5449 
5450 	if (!view->search_setup)
5451 		return got_error_msg(GOT_ERR_NOT_IMPL,
5452 		    "view search not supported");
5453 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5454 	    &match, &selected);
5455 
5456 	if (!view->searching) {
5457 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5458 		return NULL;
5459 	}
5460 
5461 	if (*match) {
5462 		if (view->searching == TOG_SEARCH_FORWARD)
5463 			lineno = *first + 1;
5464 		else
5465 			lineno = *first - 1;
5466 	} else
5467 		lineno = *first - 1 + *selected;
5468 
5469 	while (1) {
5470 		off_t offset;
5471 
5472 		if (lineno <= 0 || lineno > nlines) {
5473 			if (*match == 0) {
5474 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5475 				break;
5476 			}
5477 
5478 			if (view->searching == TOG_SEARCH_FORWARD)
5479 				lineno = 1;
5480 			else
5481 				lineno = nlines;
5482 		}
5483 
5484 		offset = view->type == TOG_VIEW_DIFF ?
5485 		    view->state.diff.lines[lineno - 1].offset :
5486 		    line_offsets[lineno - 1];
5487 		if (fseeko(f, offset, SEEK_SET) != 0) {
5488 			free(line);
5489 			return got_error_from_errno("fseeko");
5490 		}
5491 		linelen = getline(&line, &linesize, f);
5492 		if (linelen != -1) {
5493 			char *exstr;
5494 			err = expand_tab(&exstr, line);
5495 			if (err)
5496 				break;
5497 			if (match_line(exstr, &view->regex, 1,
5498 			    &view->regmatch)) {
5499 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5500 				*match = lineno;
5501 				free(exstr);
5502 				break;
5503 			}
5504 			free(exstr);
5505 		}
5506 		if (view->searching == TOG_SEARCH_FORWARD)
5507 			lineno++;
5508 		else
5509 			lineno--;
5510 	}
5511 	free(line);
5512 
5513 	if (*match) {
5514 		*first = *match;
5515 		*selected = 1;
5516 	}
5517 
5518 	return err;
5519 }
5520 
5521 static const struct got_error *
5522 close_diff_view(struct tog_view *view)
5523 {
5524 	const struct got_error *err = NULL;
5525 	struct tog_diff_view_state *s = &view->state.diff;
5526 
5527 	free(s->id1);
5528 	s->id1 = NULL;
5529 	free(s->id2);
5530 	s->id2 = NULL;
5531 	if (s->f && fclose(s->f) == EOF)
5532 		err = got_error_from_errno("fclose");
5533 	s->f = NULL;
5534 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5535 		err = got_error_from_errno("fclose");
5536 	s->f1 = NULL;
5537 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5538 		err = got_error_from_errno("fclose");
5539 	s->f2 = NULL;
5540 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5541 		err = got_error_from_errno("close");
5542 	s->fd1 = -1;
5543 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5544 		err = got_error_from_errno("close");
5545 	s->fd2 = -1;
5546 	free(s->lines);
5547 	s->lines = NULL;
5548 	s->nlines = 0;
5549 	return err;
5550 }
5551 
5552 static const struct got_error *
5553 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5554     struct got_object_id *id2, const char *label1, const char *label2,
5555     int diff_context, int ignore_whitespace, int force_text_diff,
5556     struct tog_view *parent_view, struct got_repository *repo)
5557 {
5558 	const struct got_error *err;
5559 	struct tog_diff_view_state *s = &view->state.diff;
5560 
5561 	memset(s, 0, sizeof(*s));
5562 	s->fd1 = -1;
5563 	s->fd2 = -1;
5564 
5565 	if (id1 != NULL && id2 != NULL) {
5566 		int type1, type2;
5567 
5568 		err = got_object_get_type(&type1, repo, id1);
5569 		if (err)
5570 			goto done;
5571 		err = got_object_get_type(&type2, repo, id2);
5572 		if (err)
5573 			goto done;
5574 
5575 		if (type1 != type2) {
5576 			err = got_error(GOT_ERR_OBJ_TYPE);
5577 			goto done;
5578 		}
5579 	}
5580 	s->first_displayed_line = 1;
5581 	s->last_displayed_line = view->nlines;
5582 	s->selected_line = 1;
5583 	s->repo = repo;
5584 	s->id1 = id1;
5585 	s->id2 = id2;
5586 	s->label1 = label1;
5587 	s->label2 = label2;
5588 
5589 	if (id1) {
5590 		s->id1 = got_object_id_dup(id1);
5591 		if (s->id1 == NULL) {
5592 			err = got_error_from_errno("got_object_id_dup");
5593 			goto done;
5594 		}
5595 	} else
5596 		s->id1 = NULL;
5597 
5598 	s->id2 = got_object_id_dup(id2);
5599 	if (s->id2 == NULL) {
5600 		err = got_error_from_errno("got_object_id_dup");
5601 		goto done;
5602 	}
5603 
5604 	s->f1 = got_opentemp();
5605 	if (s->f1 == NULL) {
5606 		err = got_error_from_errno("got_opentemp");
5607 		goto done;
5608 	}
5609 
5610 	s->f2 = got_opentemp();
5611 	if (s->f2 == NULL) {
5612 		err = got_error_from_errno("got_opentemp");
5613 		goto done;
5614 	}
5615 
5616 	s->fd1 = got_opentempfd();
5617 	if (s->fd1 == -1) {
5618 		err = got_error_from_errno("got_opentempfd");
5619 		goto done;
5620 	}
5621 
5622 	s->fd2 = got_opentempfd();
5623 	if (s->fd2 == -1) {
5624 		err = got_error_from_errno("got_opentempfd");
5625 		goto done;
5626 	}
5627 
5628 	s->diff_context = diff_context;
5629 	s->ignore_whitespace = ignore_whitespace;
5630 	s->force_text_diff = force_text_diff;
5631 	s->parent_view = parent_view;
5632 	s->repo = repo;
5633 
5634 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5635 		int rc;
5636 
5637 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5638 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5639 		if (rc != ERR)
5640 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5641 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5642 		if (rc != ERR)
5643 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5644 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5645 		if (rc != ERR)
5646 			rc = init_pair(GOT_DIFF_LINE_META,
5647 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5648 		if (rc != ERR)
5649 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5650 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5651 		if (rc != ERR)
5652 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5653 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5654 		if (rc != ERR)
5655 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5656 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5657 		if (rc != ERR)
5658 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5659 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5660 		if (rc != ERR)
5661 			rc = init_pair(GOT_DIFF_LINE_DATE,
5662 			    get_color_value("TOG_COLOR_DATE"), -1);
5663 		if (rc == ERR) {
5664 			err = got_error(GOT_ERR_RANGE);
5665 			goto done;
5666 		}
5667 	}
5668 
5669 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5670 	    view_is_splitscreen(view))
5671 		show_log_view(parent_view); /* draw border */
5672 	diff_view_indicate_progress(view);
5673 
5674 	err = create_diff(s);
5675 
5676 	view->show = show_diff_view;
5677 	view->input = input_diff_view;
5678 	view->reset = reset_diff_view;
5679 	view->close = close_diff_view;
5680 	view->search_start = search_start_diff_view;
5681 	view->search_setup = search_setup_diff_view;
5682 	view->search_next = search_next_view_match;
5683 done:
5684 	if (err) {
5685 		if (view->close == NULL)
5686 			close_diff_view(view);
5687 		view_close(view);
5688 	}
5689 	return err;
5690 }
5691 
5692 static const struct got_error *
5693 show_diff_view(struct tog_view *view)
5694 {
5695 	const struct got_error *err;
5696 	struct tog_diff_view_state *s = &view->state.diff;
5697 	char *id_str1 = NULL, *id_str2, *header;
5698 	const char *label1, *label2;
5699 
5700 	if (s->id1) {
5701 		err = got_object_id_str(&id_str1, s->id1);
5702 		if (err)
5703 			return err;
5704 		label1 = s->label1 ? s->label1 : id_str1;
5705 	} else
5706 		label1 = "/dev/null";
5707 
5708 	err = got_object_id_str(&id_str2, s->id2);
5709 	if (err)
5710 		return err;
5711 	label2 = s->label2 ? s->label2 : id_str2;
5712 
5713 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5714 		err = got_error_from_errno("asprintf");
5715 		free(id_str1);
5716 		free(id_str2);
5717 		return err;
5718 	}
5719 	free(id_str1);
5720 	free(id_str2);
5721 
5722 	err = draw_file(view, header);
5723 	free(header);
5724 	return err;
5725 }
5726 
5727 static const struct got_error *
5728 set_selected_commit(struct tog_diff_view_state *s,
5729     struct commit_queue_entry *entry)
5730 {
5731 	const struct got_error *err;
5732 	const struct got_object_id_queue *parent_ids;
5733 	struct got_commit_object *selected_commit;
5734 	struct got_object_qid *pid;
5735 
5736 	free(s->id2);
5737 	s->id2 = got_object_id_dup(entry->id);
5738 	if (s->id2 == NULL)
5739 		return got_error_from_errno("got_object_id_dup");
5740 
5741 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5742 	if (err)
5743 		return err;
5744 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5745 	free(s->id1);
5746 	pid = STAILQ_FIRST(parent_ids);
5747 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5748 	got_object_commit_close(selected_commit);
5749 	return NULL;
5750 }
5751 
5752 static const struct got_error *
5753 reset_diff_view(struct tog_view *view)
5754 {
5755 	struct tog_diff_view_state *s = &view->state.diff;
5756 
5757 	view->count = 0;
5758 	wclear(view->window);
5759 	s->first_displayed_line = 1;
5760 	s->last_displayed_line = view->nlines;
5761 	s->matched_line = 0;
5762 	diff_view_indicate_progress(view);
5763 	return create_diff(s);
5764 }
5765 
5766 static void
5767 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5768 {
5769 	int start, i;
5770 
5771 	i = start = s->first_displayed_line - 1;
5772 
5773 	while (s->lines[i].type != type) {
5774 		if (i == 0)
5775 			i = s->nlines - 1;
5776 		if (--i == start)
5777 			return; /* do nothing, requested type not in file */
5778 	}
5779 
5780 	s->selected_line = 1;
5781 	s->first_displayed_line = i;
5782 }
5783 
5784 static void
5785 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5786 {
5787 	int start, i;
5788 
5789 	i = start = s->first_displayed_line + 1;
5790 
5791 	while (s->lines[i].type != type) {
5792 		if (i == s->nlines - 1)
5793 			i = 0;
5794 		if (++i == start)
5795 			return; /* do nothing, requested type not in file */
5796 	}
5797 
5798 	s->selected_line = 1;
5799 	s->first_displayed_line = i;
5800 }
5801 
5802 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5803     int, int, int);
5804 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5805     int, int);
5806 
5807 static const struct got_error *
5808 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5809 {
5810 	const struct got_error *err = NULL;
5811 	struct tog_diff_view_state *s = &view->state.diff;
5812 	struct tog_log_view_state *ls;
5813 	struct commit_queue_entry *old_selected_entry;
5814 	char *line = NULL;
5815 	size_t linesize = 0;
5816 	ssize_t linelen;
5817 	int i, nscroll = view->nlines - 1, up = 0;
5818 
5819 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5820 
5821 	switch (ch) {
5822 	case '0':
5823 	case '$':
5824 	case KEY_RIGHT:
5825 	case 'l':
5826 	case KEY_LEFT:
5827 	case 'h':
5828 		horizontal_scroll_input(view, ch);
5829 		break;
5830 	case 'a':
5831 	case 'w':
5832 		if (ch == 'a') {
5833 			s->force_text_diff = !s->force_text_diff;
5834 			view->action = s->force_text_diff ?
5835 			    "force ASCII text enabled" :
5836 			    "force ASCII text disabled";
5837 		}
5838 		else if (ch == 'w') {
5839 			s->ignore_whitespace = !s->ignore_whitespace;
5840 			view->action = s->ignore_whitespace ?
5841 			    "ignore whitespace enabled" :
5842 			    "ignore whitespace disabled";
5843 		}
5844 		err = reset_diff_view(view);
5845 		break;
5846 	case 'g':
5847 	case KEY_HOME:
5848 		s->first_displayed_line = 1;
5849 		view->count = 0;
5850 		break;
5851 	case 'G':
5852 	case KEY_END:
5853 		view->count = 0;
5854 		if (s->eof)
5855 			break;
5856 
5857 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5858 		s->eof = 1;
5859 		break;
5860 	case 'k':
5861 	case KEY_UP:
5862 	case CTRL('p'):
5863 		if (s->first_displayed_line > 1)
5864 			s->first_displayed_line--;
5865 		else
5866 			view->count = 0;
5867 		break;
5868 	case CTRL('u'):
5869 	case 'u':
5870 		nscroll /= 2;
5871 		/* FALL THROUGH */
5872 	case KEY_PPAGE:
5873 	case CTRL('b'):
5874 	case 'b':
5875 		if (s->first_displayed_line == 1) {
5876 			view->count = 0;
5877 			break;
5878 		}
5879 		i = 0;
5880 		while (i++ < nscroll && s->first_displayed_line > 1)
5881 			s->first_displayed_line--;
5882 		break;
5883 	case 'j':
5884 	case KEY_DOWN:
5885 	case CTRL('n'):
5886 		if (!s->eof)
5887 			s->first_displayed_line++;
5888 		else
5889 			view->count = 0;
5890 		break;
5891 	case CTRL('d'):
5892 	case 'd':
5893 		nscroll /= 2;
5894 		/* FALL THROUGH */
5895 	case KEY_NPAGE:
5896 	case CTRL('f'):
5897 	case 'f':
5898 	case ' ':
5899 		if (s->eof) {
5900 			view->count = 0;
5901 			break;
5902 		}
5903 		i = 0;
5904 		while (!s->eof && i++ < nscroll) {
5905 			linelen = getline(&line, &linesize, s->f);
5906 			s->first_displayed_line++;
5907 			if (linelen == -1) {
5908 				if (feof(s->f)) {
5909 					s->eof = 1;
5910 				} else
5911 					err = got_ferror(s->f, GOT_ERR_IO);
5912 				break;
5913 			}
5914 		}
5915 		free(line);
5916 		break;
5917 	case '(':
5918 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5919 		break;
5920 	case ')':
5921 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5922 		break;
5923 	case '{':
5924 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5925 		break;
5926 	case '}':
5927 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5928 		break;
5929 	case '[':
5930 		if (s->diff_context > 0) {
5931 			s->diff_context--;
5932 			s->matched_line = 0;
5933 			diff_view_indicate_progress(view);
5934 			err = create_diff(s);
5935 			if (s->first_displayed_line + view->nlines - 1 >
5936 			    s->nlines) {
5937 				s->first_displayed_line = 1;
5938 				s->last_displayed_line = view->nlines;
5939 			}
5940 		} else
5941 			view->count = 0;
5942 		break;
5943 	case ']':
5944 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5945 			s->diff_context++;
5946 			s->matched_line = 0;
5947 			diff_view_indicate_progress(view);
5948 			err = create_diff(s);
5949 		} else
5950 			view->count = 0;
5951 		break;
5952 	case '<':
5953 	case ',':
5954 	case 'K':
5955 		up = 1;
5956 		/* FALL THROUGH */
5957 	case '>':
5958 	case '.':
5959 	case 'J':
5960 		if (s->parent_view == NULL) {
5961 			view->count = 0;
5962 			break;
5963 		}
5964 		s->parent_view->count = view->count;
5965 
5966 		if (s->parent_view->type == TOG_VIEW_LOG) {
5967 			ls = &s->parent_view->state.log;
5968 			old_selected_entry = ls->selected_entry;
5969 
5970 			err = input_log_view(NULL, s->parent_view,
5971 			    up ? KEY_UP : KEY_DOWN);
5972 			if (err)
5973 				break;
5974 			view->count = s->parent_view->count;
5975 
5976 			if (old_selected_entry == ls->selected_entry)
5977 				break;
5978 
5979 			err = set_selected_commit(s, ls->selected_entry);
5980 			if (err)
5981 				break;
5982 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5983 			struct tog_blame_view_state *bs;
5984 			struct got_object_id *id, *prev_id;
5985 
5986 			bs = &s->parent_view->state.blame;
5987 			prev_id = get_annotation_for_line(bs->blame.lines,
5988 			    bs->blame.nlines, bs->last_diffed_line);
5989 
5990 			err = input_blame_view(&view, s->parent_view,
5991 			    up ? KEY_UP : KEY_DOWN);
5992 			if (err)
5993 				break;
5994 			view->count = s->parent_view->count;
5995 
5996 			if (prev_id == NULL)
5997 				break;
5998 			id = get_selected_commit_id(bs->blame.lines,
5999 			    bs->blame.nlines, bs->first_displayed_line,
6000 			    bs->selected_line);
6001 			if (id == NULL)
6002 				break;
6003 
6004 			if (!got_object_id_cmp(prev_id, id))
6005 				break;
6006 
6007 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6008 			if (err)
6009 				break;
6010 		}
6011 		s->first_displayed_line = 1;
6012 		s->last_displayed_line = view->nlines;
6013 		s->matched_line = 0;
6014 		view->x = 0;
6015 
6016 		diff_view_indicate_progress(view);
6017 		err = create_diff(s);
6018 		break;
6019 	default:
6020 		view->count = 0;
6021 		break;
6022 	}
6023 
6024 	return err;
6025 }
6026 
6027 static const struct got_error *
6028 cmd_diff(int argc, char *argv[])
6029 {
6030 	const struct got_error *error;
6031 	struct got_repository *repo = NULL;
6032 	struct got_worktree *worktree = NULL;
6033 	struct got_object_id *id1 = NULL, *id2 = NULL;
6034 	char *repo_path = NULL, *cwd = NULL;
6035 	char *id_str1 = NULL, *id_str2 = NULL;
6036 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6037 	char *label1 = NULL, *label2 = NULL;
6038 	int diff_context = 3, ignore_whitespace = 0;
6039 	int ch, force_text_diff = 0;
6040 	const char *errstr;
6041 	struct tog_view *view;
6042 	int *pack_fds = NULL;
6043 
6044 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6045 		switch (ch) {
6046 		case 'a':
6047 			force_text_diff = 1;
6048 			break;
6049 		case 'C':
6050 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6051 			    &errstr);
6052 			if (errstr != NULL)
6053 				errx(1, "number of context lines is %s: %s",
6054 				    errstr, errstr);
6055 			break;
6056 		case 'r':
6057 			repo_path = realpath(optarg, NULL);
6058 			if (repo_path == NULL)
6059 				return got_error_from_errno2("realpath",
6060 				    optarg);
6061 			got_path_strip_trailing_slashes(repo_path);
6062 			break;
6063 		case 'w':
6064 			ignore_whitespace = 1;
6065 			break;
6066 		default:
6067 			usage_diff();
6068 			/* NOTREACHED */
6069 		}
6070 	}
6071 
6072 	argc -= optind;
6073 	argv += optind;
6074 
6075 	if (argc == 0) {
6076 		usage_diff(); /* TODO show local worktree changes */
6077 	} else if (argc == 2) {
6078 		id_str1 = argv[0];
6079 		id_str2 = argv[1];
6080 	} else
6081 		usage_diff();
6082 
6083 	error = got_repo_pack_fds_open(&pack_fds);
6084 	if (error)
6085 		goto done;
6086 
6087 	if (repo_path == NULL) {
6088 		cwd = getcwd(NULL, 0);
6089 		if (cwd == NULL)
6090 			return got_error_from_errno("getcwd");
6091 		error = got_worktree_open(&worktree, cwd, NULL);
6092 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6093 			goto done;
6094 		if (worktree)
6095 			repo_path =
6096 			    strdup(got_worktree_get_repo_path(worktree));
6097 		else
6098 			repo_path = strdup(cwd);
6099 		if (repo_path == NULL) {
6100 			error = got_error_from_errno("strdup");
6101 			goto done;
6102 		}
6103 	}
6104 
6105 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6106 	if (error)
6107 		goto done;
6108 
6109 	init_curses();
6110 
6111 	error = apply_unveil(got_repo_get_path(repo), NULL);
6112 	if (error)
6113 		goto done;
6114 
6115 	error = tog_load_refs(repo, 0);
6116 	if (error)
6117 		goto done;
6118 
6119 	if (id_str1 != NULL) {
6120 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6121 		    repo, worktree);
6122 		if (error != NULL)
6123 			goto done;
6124 		if (keyword_idstr1 != NULL)
6125 			id_str1 = keyword_idstr1;
6126 	}
6127 	if (id_str2 != NULL) {
6128 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6129 		    repo, worktree);
6130 		if (error != NULL)
6131 			goto done;
6132 		if (keyword_idstr2 != NULL)
6133 			id_str2 = keyword_idstr2;
6134 	}
6135 
6136 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6137 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6138 	if (error)
6139 		goto done;
6140 
6141 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6142 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6143 	if (error)
6144 		goto done;
6145 
6146 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6147 	if (view == NULL) {
6148 		error = got_error_from_errno("view_open");
6149 		goto done;
6150 	}
6151 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6152 	    ignore_whitespace, force_text_diff, NULL,  repo);
6153 	if (error)
6154 		goto done;
6155 
6156 	if (worktree) {
6157 		error = set_tog_base_commit(repo, worktree);
6158 		if (error != NULL)
6159 			goto done;
6160 	}
6161 
6162 	error = view_loop(view);
6163 
6164 done:
6165 	free(tog_base_commit.id);
6166 	free(keyword_idstr1);
6167 	free(keyword_idstr2);
6168 	free(label1);
6169 	free(label2);
6170 	free(repo_path);
6171 	free(cwd);
6172 	if (repo) {
6173 		const struct got_error *close_err = got_repo_close(repo);
6174 		if (error == NULL)
6175 			error = close_err;
6176 	}
6177 	if (worktree)
6178 		got_worktree_close(worktree);
6179 	if (pack_fds) {
6180 		const struct got_error *pack_err =
6181 		    got_repo_pack_fds_close(pack_fds);
6182 		if (error == NULL)
6183 			error = pack_err;
6184 	}
6185 	tog_free_refs();
6186 	return error;
6187 }
6188 
6189 __dead static void
6190 usage_blame(void)
6191 {
6192 	endwin();
6193 	fprintf(stderr,
6194 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6195 	    getprogname());
6196 	exit(1);
6197 }
6198 
6199 struct tog_blame_line {
6200 	int annotated;
6201 	struct got_object_id *id;
6202 };
6203 
6204 static const struct got_error *
6205 draw_blame(struct tog_view *view)
6206 {
6207 	struct tog_blame_view_state *s = &view->state.blame;
6208 	struct tog_blame *blame = &s->blame;
6209 	regmatch_t *regmatch = &view->regmatch;
6210 	const struct got_error *err;
6211 	int lineno = 0, nprinted = 0;
6212 	char *line = NULL;
6213 	size_t linesize = 0;
6214 	ssize_t linelen;
6215 	wchar_t *wline;
6216 	int width;
6217 	struct tog_blame_line *blame_line;
6218 	struct got_object_id *prev_id = NULL;
6219 	char *id_str;
6220 	struct tog_color *tc;
6221 
6222 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6223 	if (err)
6224 		return err;
6225 
6226 	rewind(blame->f);
6227 	werase(view->window);
6228 
6229 	if (asprintf(&line, "commit %s", id_str) == -1) {
6230 		err = got_error_from_errno("asprintf");
6231 		free(id_str);
6232 		return err;
6233 	}
6234 
6235 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6236 	free(line);
6237 	line = NULL;
6238 	if (err)
6239 		return err;
6240 	if (view_needs_focus_indication(view))
6241 		wstandout(view->window);
6242 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6243 	if (tc)
6244 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6245 	waddwstr(view->window, wline);
6246 	while (width++ < view->ncols)
6247 		waddch(view->window, ' ');
6248 	if (tc)
6249 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6250 	if (view_needs_focus_indication(view))
6251 		wstandend(view->window);
6252 	free(wline);
6253 	wline = NULL;
6254 
6255 	if (view->gline > blame->nlines)
6256 		view->gline = blame->nlines;
6257 
6258 	if (tog_io.wait_for_ui) {
6259 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6260 		int rc;
6261 
6262 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6263 		if (rc)
6264 			return got_error_set_errno(rc, "pthread_cond_wait");
6265 		tog_io.wait_for_ui = 0;
6266 	}
6267 
6268 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6269 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6270 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6271 		free(id_str);
6272 		return got_error_from_errno("asprintf");
6273 	}
6274 	free(id_str);
6275 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6276 	free(line);
6277 	line = NULL;
6278 	if (err)
6279 		return err;
6280 	waddwstr(view->window, wline);
6281 	free(wline);
6282 	wline = NULL;
6283 	if (width < view->ncols - 1)
6284 		waddch(view->window, '\n');
6285 
6286 	s->eof = 0;
6287 	view->maxx = 0;
6288 	while (nprinted < view->nlines - 2) {
6289 		linelen = getline(&line, &linesize, blame->f);
6290 		if (linelen == -1) {
6291 			if (feof(blame->f)) {
6292 				s->eof = 1;
6293 				break;
6294 			}
6295 			free(line);
6296 			return got_ferror(blame->f, GOT_ERR_IO);
6297 		}
6298 		if (++lineno < s->first_displayed_line)
6299 			continue;
6300 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6301 			continue;
6302 
6303 		/* Set view->maxx based on full line length. */
6304 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6305 		if (err) {
6306 			free(line);
6307 			return err;
6308 		}
6309 		free(wline);
6310 		wline = NULL;
6311 		view->maxx = MAX(view->maxx, width);
6312 
6313 		if (nprinted == s->selected_line - 1)
6314 			wstandout(view->window);
6315 
6316 		if (blame->nlines > 0) {
6317 			blame_line = &blame->lines[lineno - 1];
6318 			if (blame_line->annotated && prev_id &&
6319 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6320 			    !(nprinted == s->selected_line - 1)) {
6321 				waddstr(view->window, "        ");
6322 			} else if (blame_line->annotated) {
6323 				char *id_str;
6324 				err = got_object_id_str(&id_str,
6325 				    blame_line->id);
6326 				if (err) {
6327 					free(line);
6328 					return err;
6329 				}
6330 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6331 				if (tc)
6332 					wattr_on(view->window,
6333 					    COLOR_PAIR(tc->colorpair), NULL);
6334 				wprintw(view->window, "%.8s", id_str);
6335 				if (tc)
6336 					wattr_off(view->window,
6337 					    COLOR_PAIR(tc->colorpair), NULL);
6338 				free(id_str);
6339 				prev_id = blame_line->id;
6340 			} else {
6341 				waddstr(view->window, "........");
6342 				prev_id = NULL;
6343 			}
6344 		} else {
6345 			waddstr(view->window, "........");
6346 			prev_id = NULL;
6347 		}
6348 
6349 		if (nprinted == s->selected_line - 1)
6350 			wstandend(view->window);
6351 		waddstr(view->window, " ");
6352 
6353 		if (view->ncols <= 9) {
6354 			width = 9;
6355 		} else if (s->first_displayed_line + nprinted ==
6356 		    s->matched_line &&
6357 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6358 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6359 			    view->window, view->x, regmatch);
6360 			if (err) {
6361 				free(line);
6362 				return err;
6363 			}
6364 			width += 9;
6365 		} else {
6366 			int skip;
6367 			err = format_line(&wline, &width, &skip, line,
6368 			    view->x, view->ncols - 9, 9, 1);
6369 			if (err) {
6370 				free(line);
6371 				return err;
6372 			}
6373 			waddwstr(view->window, &wline[skip]);
6374 			width += 9;
6375 			free(wline);
6376 			wline = NULL;
6377 		}
6378 
6379 		if (width <= view->ncols - 1)
6380 			waddch(view->window, '\n');
6381 		if (++nprinted == 1)
6382 			s->first_displayed_line = lineno;
6383 	}
6384 	free(line);
6385 	s->last_displayed_line = lineno;
6386 
6387 	view_border(view);
6388 
6389 	return NULL;
6390 }
6391 
6392 static const struct got_error *
6393 blame_cb(void *arg, int nlines, int lineno,
6394     struct got_commit_object *commit, struct got_object_id *id)
6395 {
6396 	const struct got_error *err = NULL;
6397 	struct tog_blame_cb_args *a = arg;
6398 	struct tog_blame_line *line;
6399 	int errcode;
6400 
6401 	if (nlines != a->nlines ||
6402 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6403 		return got_error(GOT_ERR_RANGE);
6404 
6405 	errcode = pthread_mutex_lock(&tog_mutex);
6406 	if (errcode)
6407 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6408 
6409 	if (*a->quit) {	/* user has quit the blame view */
6410 		err = got_error(GOT_ERR_ITER_COMPLETED);
6411 		goto done;
6412 	}
6413 
6414 	if (lineno == -1)
6415 		goto done; /* no change in this commit */
6416 
6417 	line = &a->lines[lineno - 1];
6418 	if (line->annotated)
6419 		goto done;
6420 
6421 	line->id = got_object_id_dup(id);
6422 	if (line->id == NULL) {
6423 		err = got_error_from_errno("got_object_id_dup");
6424 		goto done;
6425 	}
6426 	line->annotated = 1;
6427 done:
6428 	errcode = pthread_mutex_unlock(&tog_mutex);
6429 	if (errcode)
6430 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6431 	return err;
6432 }
6433 
6434 static void *
6435 blame_thread(void *arg)
6436 {
6437 	const struct got_error *err, *close_err;
6438 	struct tog_blame_thread_args *ta = arg;
6439 	struct tog_blame_cb_args *a = ta->cb_args;
6440 	int errcode, fd1 = -1, fd2 = -1;
6441 	FILE *f1 = NULL, *f2 = NULL;
6442 
6443 	fd1 = got_opentempfd();
6444 	if (fd1 == -1)
6445 		return (void *)got_error_from_errno("got_opentempfd");
6446 
6447 	fd2 = got_opentempfd();
6448 	if (fd2 == -1) {
6449 		err = got_error_from_errno("got_opentempfd");
6450 		goto done;
6451 	}
6452 
6453 	f1 = got_opentemp();
6454 	if (f1 == NULL) {
6455 		err = (void *)got_error_from_errno("got_opentemp");
6456 		goto done;
6457 	}
6458 	f2 = got_opentemp();
6459 	if (f2 == NULL) {
6460 		err = (void *)got_error_from_errno("got_opentemp");
6461 		goto done;
6462 	}
6463 
6464 	err = block_signals_used_by_main_thread();
6465 	if (err)
6466 		goto done;
6467 
6468 	err = got_blame(ta->path, a->commit_id, ta->repo,
6469 	    tog_diff_algo, blame_cb, ta->cb_args,
6470 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6471 	if (err && err->code == GOT_ERR_CANCELLED)
6472 		err = NULL;
6473 
6474 	errcode = pthread_mutex_lock(&tog_mutex);
6475 	if (errcode) {
6476 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6477 		goto done;
6478 	}
6479 
6480 	close_err = got_repo_close(ta->repo);
6481 	if (err == NULL)
6482 		err = close_err;
6483 	ta->repo = NULL;
6484 	*ta->complete = 1;
6485 
6486 	if (tog_io.wait_for_ui) {
6487 		errcode = pthread_cond_signal(&ta->blame_complete);
6488 		if (errcode && err == NULL)
6489 			err = got_error_set_errno(errcode,
6490 			    "pthread_cond_signal");
6491 	}
6492 
6493 	errcode = pthread_mutex_unlock(&tog_mutex);
6494 	if (errcode && err == NULL)
6495 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6496 
6497 done:
6498 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6499 		err = got_error_from_errno("close");
6500 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6501 		err = got_error_from_errno("close");
6502 	if (f1 && fclose(f1) == EOF && err == NULL)
6503 		err = got_error_from_errno("fclose");
6504 	if (f2 && fclose(f2) == EOF && err == NULL)
6505 		err = got_error_from_errno("fclose");
6506 
6507 	return (void *)err;
6508 }
6509 
6510 static struct got_object_id *
6511 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6512     int first_displayed_line, int selected_line)
6513 {
6514 	struct tog_blame_line *line;
6515 
6516 	if (nlines <= 0)
6517 		return NULL;
6518 
6519 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6520 	if (!line->annotated)
6521 		return NULL;
6522 
6523 	return line->id;
6524 }
6525 
6526 static struct got_object_id *
6527 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6528     int lineno)
6529 {
6530 	struct tog_blame_line *line;
6531 
6532 	if (nlines <= 0 || lineno >= nlines)
6533 		return NULL;
6534 
6535 	line = &lines[lineno - 1];
6536 	if (!line->annotated)
6537 		return NULL;
6538 
6539 	return line->id;
6540 }
6541 
6542 static const struct got_error *
6543 stop_blame(struct tog_blame *blame)
6544 {
6545 	const struct got_error *err = NULL;
6546 	int i;
6547 
6548 	if (blame->thread) {
6549 		int errcode;
6550 		errcode = pthread_mutex_unlock(&tog_mutex);
6551 		if (errcode)
6552 			return got_error_set_errno(errcode,
6553 			    "pthread_mutex_unlock");
6554 		errcode = pthread_join(blame->thread, (void **)&err);
6555 		if (errcode)
6556 			return got_error_set_errno(errcode, "pthread_join");
6557 		errcode = pthread_mutex_lock(&tog_mutex);
6558 		if (errcode)
6559 			return got_error_set_errno(errcode,
6560 			    "pthread_mutex_lock");
6561 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6562 			err = NULL;
6563 		blame->thread = NULL;
6564 	}
6565 	if (blame->thread_args.repo) {
6566 		const struct got_error *close_err;
6567 		close_err = got_repo_close(blame->thread_args.repo);
6568 		if (err == NULL)
6569 			err = close_err;
6570 		blame->thread_args.repo = NULL;
6571 	}
6572 	if (blame->f) {
6573 		if (fclose(blame->f) == EOF && err == NULL)
6574 			err = got_error_from_errno("fclose");
6575 		blame->f = NULL;
6576 	}
6577 	if (blame->lines) {
6578 		for (i = 0; i < blame->nlines; i++)
6579 			free(blame->lines[i].id);
6580 		free(blame->lines);
6581 		blame->lines = NULL;
6582 	}
6583 	free(blame->cb_args.commit_id);
6584 	blame->cb_args.commit_id = NULL;
6585 	if (blame->pack_fds) {
6586 		const struct got_error *pack_err =
6587 		    got_repo_pack_fds_close(blame->pack_fds);
6588 		if (err == NULL)
6589 			err = pack_err;
6590 		blame->pack_fds = NULL;
6591 	}
6592 	return err;
6593 }
6594 
6595 static const struct got_error *
6596 cancel_blame_view(void *arg)
6597 {
6598 	const struct got_error *err = NULL;
6599 	int *done = arg;
6600 	int errcode;
6601 
6602 	errcode = pthread_mutex_lock(&tog_mutex);
6603 	if (errcode)
6604 		return got_error_set_errno(errcode,
6605 		    "pthread_mutex_unlock");
6606 
6607 	if (*done)
6608 		err = got_error(GOT_ERR_CANCELLED);
6609 
6610 	errcode = pthread_mutex_unlock(&tog_mutex);
6611 	if (errcode)
6612 		return got_error_set_errno(errcode,
6613 		    "pthread_mutex_lock");
6614 
6615 	return err;
6616 }
6617 
6618 static const struct got_error *
6619 run_blame(struct tog_view *view)
6620 {
6621 	struct tog_blame_view_state *s = &view->state.blame;
6622 	struct tog_blame *blame = &s->blame;
6623 	const struct got_error *err = NULL;
6624 	struct got_commit_object *commit = NULL;
6625 	struct got_blob_object *blob = NULL;
6626 	struct got_repository *thread_repo = NULL;
6627 	struct got_object_id *obj_id = NULL;
6628 	int obj_type, fd = -1;
6629 	int *pack_fds = NULL;
6630 
6631 	err = got_object_open_as_commit(&commit, s->repo,
6632 	    &s->blamed_commit->id);
6633 	if (err)
6634 		return err;
6635 
6636 	fd = got_opentempfd();
6637 	if (fd == -1) {
6638 		err = got_error_from_errno("got_opentempfd");
6639 		goto done;
6640 	}
6641 
6642 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6643 	if (err)
6644 		goto done;
6645 
6646 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6647 	if (err)
6648 		goto done;
6649 
6650 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6651 		err = got_error(GOT_ERR_OBJ_TYPE);
6652 		goto done;
6653 	}
6654 
6655 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6656 	if (err)
6657 		goto done;
6658 	blame->f = got_opentemp();
6659 	if (blame->f == NULL) {
6660 		err = got_error_from_errno("got_opentemp");
6661 		goto done;
6662 	}
6663 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6664 	    &blame->line_offsets, blame->f, blob);
6665 	if (err)
6666 		goto done;
6667 	if (blame->nlines == 0) {
6668 		s->blame_complete = 1;
6669 		goto done;
6670 	}
6671 
6672 	/* Don't include \n at EOF in the blame line count. */
6673 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6674 		blame->nlines--;
6675 
6676 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6677 	if (blame->lines == NULL) {
6678 		err = got_error_from_errno("calloc");
6679 		goto done;
6680 	}
6681 
6682 	err = got_repo_pack_fds_open(&pack_fds);
6683 	if (err)
6684 		goto done;
6685 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6686 	    pack_fds);
6687 	if (err)
6688 		goto done;
6689 
6690 	blame->pack_fds = pack_fds;
6691 	blame->cb_args.view = view;
6692 	blame->cb_args.lines = blame->lines;
6693 	blame->cb_args.nlines = blame->nlines;
6694 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6695 	if (blame->cb_args.commit_id == NULL) {
6696 		err = got_error_from_errno("got_object_id_dup");
6697 		goto done;
6698 	}
6699 	blame->cb_args.quit = &s->done;
6700 
6701 	blame->thread_args.path = s->path;
6702 	blame->thread_args.repo = thread_repo;
6703 	blame->thread_args.cb_args = &blame->cb_args;
6704 	blame->thread_args.complete = &s->blame_complete;
6705 	blame->thread_args.cancel_cb = cancel_blame_view;
6706 	blame->thread_args.cancel_arg = &s->done;
6707 	s->blame_complete = 0;
6708 
6709 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6710 		s->first_displayed_line = 1;
6711 		s->last_displayed_line = view->nlines;
6712 		s->selected_line = 1;
6713 	}
6714 	s->matched_line = 0;
6715 
6716 done:
6717 	if (commit)
6718 		got_object_commit_close(commit);
6719 	if (fd != -1 && close(fd) == -1 && err == NULL)
6720 		err = got_error_from_errno("close");
6721 	if (blob)
6722 		got_object_blob_close(blob);
6723 	free(obj_id);
6724 	if (err)
6725 		stop_blame(blame);
6726 	return err;
6727 }
6728 
6729 static const struct got_error *
6730 open_blame_view(struct tog_view *view, char *path,
6731     struct got_object_id *commit_id, struct got_repository *repo)
6732 {
6733 	const struct got_error *err = NULL;
6734 	struct tog_blame_view_state *s = &view->state.blame;
6735 
6736 	STAILQ_INIT(&s->blamed_commits);
6737 
6738 	s->path = strdup(path);
6739 	if (s->path == NULL)
6740 		return got_error_from_errno("strdup");
6741 
6742 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6743 	if (err) {
6744 		free(s->path);
6745 		return err;
6746 	}
6747 
6748 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6749 	s->first_displayed_line = 1;
6750 	s->last_displayed_line = view->nlines;
6751 	s->selected_line = 1;
6752 	s->blame_complete = 0;
6753 	s->repo = repo;
6754 	s->commit_id = commit_id;
6755 	memset(&s->blame, 0, sizeof(s->blame));
6756 
6757 	STAILQ_INIT(&s->colors);
6758 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6759 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6760 		    get_color_value("TOG_COLOR_COMMIT"));
6761 		if (err)
6762 			return err;
6763 	}
6764 
6765 	view->show = show_blame_view;
6766 	view->input = input_blame_view;
6767 	view->reset = reset_blame_view;
6768 	view->close = close_blame_view;
6769 	view->search_start = search_start_blame_view;
6770 	view->search_setup = search_setup_blame_view;
6771 	view->search_next = search_next_view_match;
6772 
6773 	if (using_mock_io) {
6774 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6775 		int rc;
6776 
6777 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6778 		if (rc)
6779 			return got_error_set_errno(rc, "pthread_cond_init");
6780 	}
6781 
6782 	return run_blame(view);
6783 }
6784 
6785 static const struct got_error *
6786 close_blame_view(struct tog_view *view)
6787 {
6788 	const struct got_error *err = NULL;
6789 	struct tog_blame_view_state *s = &view->state.blame;
6790 
6791 	if (s->blame.thread)
6792 		err = stop_blame(&s->blame);
6793 
6794 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6795 		struct got_object_qid *blamed_commit;
6796 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6797 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6798 		got_object_qid_free(blamed_commit);
6799 	}
6800 
6801 	if (using_mock_io) {
6802 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6803 		int rc;
6804 
6805 		rc = pthread_cond_destroy(&bta->blame_complete);
6806 		if (rc && err == NULL)
6807 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6808 	}
6809 
6810 	free(s->path);
6811 	free_colors(&s->colors);
6812 	return err;
6813 }
6814 
6815 static const struct got_error *
6816 search_start_blame_view(struct tog_view *view)
6817 {
6818 	struct tog_blame_view_state *s = &view->state.blame;
6819 
6820 	s->matched_line = 0;
6821 	return NULL;
6822 }
6823 
6824 static void
6825 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6826     size_t *nlines, int **first, int **last, int **match, int **selected)
6827 {
6828 	struct tog_blame_view_state *s = &view->state.blame;
6829 
6830 	*f = s->blame.f;
6831 	*nlines = s->blame.nlines;
6832 	*line_offsets = s->blame.line_offsets;
6833 	*match = &s->matched_line;
6834 	*first = &s->first_displayed_line;
6835 	*last = &s->last_displayed_line;
6836 	*selected = &s->selected_line;
6837 }
6838 
6839 static const struct got_error *
6840 show_blame_view(struct tog_view *view)
6841 {
6842 	const struct got_error *err = NULL;
6843 	struct tog_blame_view_state *s = &view->state.blame;
6844 	int errcode;
6845 
6846 	if (s->blame.thread == NULL && !s->blame_complete) {
6847 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6848 		    &s->blame.thread_args);
6849 		if (errcode)
6850 			return got_error_set_errno(errcode, "pthread_create");
6851 
6852 		if (!using_mock_io)
6853 			halfdelay(1); /* fast refresh while annotating  */
6854 	}
6855 
6856 	if (s->blame_complete && !using_mock_io)
6857 		halfdelay(10); /* disable fast refresh */
6858 
6859 	err = draw_blame(view);
6860 
6861 	view_border(view);
6862 	return err;
6863 }
6864 
6865 static const struct got_error *
6866 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6867     struct got_repository *repo, struct got_object_id *id)
6868 {
6869 	struct tog_view		*log_view;
6870 	const struct got_error	*err = NULL;
6871 
6872 	*new_view = NULL;
6873 
6874 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6875 	if (log_view == NULL)
6876 		return got_error_from_errno("view_open");
6877 
6878 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6879 	if (err)
6880 		view_close(log_view);
6881 	else
6882 		*new_view = log_view;
6883 
6884 	return err;
6885 }
6886 
6887 static const struct got_error *
6888 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6889 {
6890 	const struct got_error *err = NULL, *thread_err = NULL;
6891 	struct tog_view *diff_view;
6892 	struct tog_blame_view_state *s = &view->state.blame;
6893 	int eos, nscroll, begin_y = 0, begin_x = 0;
6894 
6895 	eos = nscroll = view->nlines - 2;
6896 	if (view_is_hsplit_top(view))
6897 		--eos;  /* border */
6898 
6899 	switch (ch) {
6900 	case '0':
6901 	case '$':
6902 	case KEY_RIGHT:
6903 	case 'l':
6904 	case KEY_LEFT:
6905 	case 'h':
6906 		horizontal_scroll_input(view, ch);
6907 		break;
6908 	case 'q':
6909 		s->done = 1;
6910 		break;
6911 	case 'g':
6912 	case KEY_HOME:
6913 		s->selected_line = 1;
6914 		s->first_displayed_line = 1;
6915 		view->count = 0;
6916 		break;
6917 	case 'G':
6918 	case KEY_END:
6919 		if (s->blame.nlines < eos) {
6920 			s->selected_line = s->blame.nlines;
6921 			s->first_displayed_line = 1;
6922 		} else {
6923 			s->selected_line = eos;
6924 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6925 		}
6926 		view->count = 0;
6927 		break;
6928 	case 'k':
6929 	case KEY_UP:
6930 	case CTRL('p'):
6931 		if (s->selected_line > 1)
6932 			s->selected_line--;
6933 		else if (s->selected_line == 1 &&
6934 		    s->first_displayed_line > 1)
6935 			s->first_displayed_line--;
6936 		else
6937 			view->count = 0;
6938 		break;
6939 	case CTRL('u'):
6940 	case 'u':
6941 		nscroll /= 2;
6942 		/* FALL THROUGH */
6943 	case KEY_PPAGE:
6944 	case CTRL('b'):
6945 	case 'b':
6946 		if (s->first_displayed_line == 1) {
6947 			if (view->count > 1)
6948 				nscroll += nscroll;
6949 			s->selected_line = MAX(1, s->selected_line - nscroll);
6950 			view->count = 0;
6951 			break;
6952 		}
6953 		if (s->first_displayed_line > nscroll)
6954 			s->first_displayed_line -= nscroll;
6955 		else
6956 			s->first_displayed_line = 1;
6957 		break;
6958 	case 'j':
6959 	case KEY_DOWN:
6960 	case CTRL('n'):
6961 		if (s->selected_line < eos && s->first_displayed_line +
6962 		    s->selected_line <= s->blame.nlines)
6963 			s->selected_line++;
6964 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6965 			s->first_displayed_line++;
6966 		else
6967 			view->count = 0;
6968 		break;
6969 	case 'c':
6970 	case 'p': {
6971 		struct got_object_id *id = NULL;
6972 
6973 		view->count = 0;
6974 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6975 		    s->first_displayed_line, s->selected_line);
6976 		if (id == NULL)
6977 			break;
6978 		if (ch == 'p') {
6979 			struct got_commit_object *commit, *pcommit;
6980 			struct got_object_qid *pid;
6981 			struct got_object_id *blob_id = NULL;
6982 			int obj_type;
6983 			err = got_object_open_as_commit(&commit,
6984 			    s->repo, id);
6985 			if (err)
6986 				break;
6987 			pid = STAILQ_FIRST(
6988 			    got_object_commit_get_parent_ids(commit));
6989 			if (pid == NULL) {
6990 				got_object_commit_close(commit);
6991 				break;
6992 			}
6993 			/* Check if path history ends here. */
6994 			err = got_object_open_as_commit(&pcommit,
6995 			    s->repo, &pid->id);
6996 			if (err)
6997 				break;
6998 			err = got_object_id_by_path(&blob_id, s->repo,
6999 			    pcommit, s->path);
7000 			got_object_commit_close(pcommit);
7001 			if (err) {
7002 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7003 					err = NULL;
7004 				got_object_commit_close(commit);
7005 				break;
7006 			}
7007 			err = got_object_get_type(&obj_type, s->repo,
7008 			    blob_id);
7009 			free(blob_id);
7010 			/* Can't blame non-blob type objects. */
7011 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7012 				got_object_commit_close(commit);
7013 				break;
7014 			}
7015 			err = got_object_qid_alloc(&s->blamed_commit,
7016 			    &pid->id);
7017 			got_object_commit_close(commit);
7018 		} else {
7019 			if (got_object_id_cmp(id,
7020 			    &s->blamed_commit->id) == 0)
7021 				break;
7022 			err = got_object_qid_alloc(&s->blamed_commit,
7023 			    id);
7024 		}
7025 		if (err)
7026 			break;
7027 		s->done = 1;
7028 		thread_err = stop_blame(&s->blame);
7029 		s->done = 0;
7030 		if (thread_err)
7031 			break;
7032 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7033 		    s->blamed_commit, entry);
7034 		err = run_blame(view);
7035 		if (err)
7036 			break;
7037 		break;
7038 	}
7039 	case 'C': {
7040 		struct got_object_qid *first;
7041 
7042 		view->count = 0;
7043 		first = STAILQ_FIRST(&s->blamed_commits);
7044 		if (!got_object_id_cmp(&first->id, s->commit_id))
7045 			break;
7046 		s->done = 1;
7047 		thread_err = stop_blame(&s->blame);
7048 		s->done = 0;
7049 		if (thread_err)
7050 			break;
7051 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7052 		got_object_qid_free(s->blamed_commit);
7053 		s->blamed_commit =
7054 		    STAILQ_FIRST(&s->blamed_commits);
7055 		err = run_blame(view);
7056 		if (err)
7057 			break;
7058 		break;
7059 	}
7060 	case 'L':
7061 		view->count = 0;
7062 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7063 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7064 		if (s->id_to_log)
7065 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7066 		break;
7067 	case KEY_ENTER:
7068 	case '\r': {
7069 		struct got_object_id *id = NULL;
7070 		struct got_object_qid *pid;
7071 		struct got_commit_object *commit = NULL;
7072 
7073 		view->count = 0;
7074 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7075 		    s->first_displayed_line, s->selected_line);
7076 		if (id == NULL)
7077 			break;
7078 		err = got_object_open_as_commit(&commit, s->repo, id);
7079 		if (err)
7080 			break;
7081 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7082 		if (*new_view) {
7083 			/* traversed from diff view, release diff resources  */
7084 			err = close_diff_view(*new_view);
7085 			if (err)
7086 				break;
7087 			diff_view = *new_view;
7088 		} else {
7089 			if (view_is_parent_view(view))
7090 				view_get_split(view, &begin_y, &begin_x);
7091 
7092 			diff_view = view_open(0, 0, begin_y, begin_x,
7093 			    TOG_VIEW_DIFF);
7094 			if (diff_view == NULL) {
7095 				got_object_commit_close(commit);
7096 				err = got_error_from_errno("view_open");
7097 				break;
7098 			}
7099 		}
7100 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7101 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7102 		got_object_commit_close(commit);
7103 		if (err)
7104 			break;
7105 		s->last_diffed_line = s->first_displayed_line - 1 +
7106 		    s->selected_line;
7107 		if (*new_view)
7108 			break;	/* still open from active diff view */
7109 		if (view_is_parent_view(view) &&
7110 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7111 			err = view_init_hsplit(view, begin_y);
7112 			if (err)
7113 				break;
7114 		}
7115 
7116 		view->focussed = 0;
7117 		diff_view->focussed = 1;
7118 		diff_view->mode = view->mode;
7119 		diff_view->nlines = view->lines - begin_y;
7120 		if (view_is_parent_view(view)) {
7121 			view_transfer_size(diff_view, view);
7122 			err = view_close_child(view);
7123 			if (err)
7124 				break;
7125 			err = view_set_child(view, diff_view);
7126 			if (err)
7127 				break;
7128 			view->focus_child = 1;
7129 		} else
7130 			*new_view = diff_view;
7131 		if (err)
7132 			break;
7133 		break;
7134 	}
7135 	case CTRL('d'):
7136 	case 'd':
7137 		nscroll /= 2;
7138 		/* FALL THROUGH */
7139 	case KEY_NPAGE:
7140 	case CTRL('f'):
7141 	case 'f':
7142 	case ' ':
7143 		if (s->last_displayed_line >= s->blame.nlines &&
7144 		    s->selected_line >= MIN(s->blame.nlines,
7145 		    view->nlines - 2)) {
7146 			view->count = 0;
7147 			break;
7148 		}
7149 		if (s->last_displayed_line >= s->blame.nlines &&
7150 		    s->selected_line < view->nlines - 2) {
7151 			s->selected_line +=
7152 			    MIN(nscroll, s->last_displayed_line -
7153 			    s->first_displayed_line - s->selected_line + 1);
7154 		}
7155 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7156 			s->first_displayed_line += nscroll;
7157 		else
7158 			s->first_displayed_line =
7159 			    s->blame.nlines - (view->nlines - 3);
7160 		break;
7161 	case KEY_RESIZE:
7162 		if (s->selected_line > view->nlines - 2) {
7163 			s->selected_line = MIN(s->blame.nlines,
7164 			    view->nlines - 2);
7165 		}
7166 		break;
7167 	default:
7168 		view->count = 0;
7169 		break;
7170 	}
7171 	return thread_err ? thread_err : err;
7172 }
7173 
7174 static const struct got_error *
7175 reset_blame_view(struct tog_view *view)
7176 {
7177 	const struct got_error *err;
7178 	struct tog_blame_view_state *s = &view->state.blame;
7179 
7180 	view->count = 0;
7181 	s->done = 1;
7182 	err = stop_blame(&s->blame);
7183 	s->done = 0;
7184 	if (err)
7185 		return err;
7186 	return run_blame(view);
7187 }
7188 
7189 static const struct got_error *
7190 cmd_blame(int argc, char *argv[])
7191 {
7192 	const struct got_error *error;
7193 	struct got_repository *repo = NULL;
7194 	struct got_worktree *worktree = NULL;
7195 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7196 	char *link_target = NULL;
7197 	struct got_object_id *commit_id = NULL;
7198 	struct got_commit_object *commit = NULL;
7199 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7200 	int ch;
7201 	struct tog_view *view = NULL;
7202 	int *pack_fds = NULL;
7203 
7204 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7205 		switch (ch) {
7206 		case 'c':
7207 			commit_id_str = optarg;
7208 			break;
7209 		case 'r':
7210 			repo_path = realpath(optarg, NULL);
7211 			if (repo_path == NULL)
7212 				return got_error_from_errno2("realpath",
7213 				    optarg);
7214 			break;
7215 		default:
7216 			usage_blame();
7217 			/* NOTREACHED */
7218 		}
7219 	}
7220 
7221 	argc -= optind;
7222 	argv += optind;
7223 
7224 	if (argc != 1)
7225 		usage_blame();
7226 
7227 	error = got_repo_pack_fds_open(&pack_fds);
7228 	if (error != NULL)
7229 		goto done;
7230 
7231 	if (repo_path == NULL) {
7232 		cwd = getcwd(NULL, 0);
7233 		if (cwd == NULL)
7234 			return got_error_from_errno("getcwd");
7235 		error = got_worktree_open(&worktree, cwd, NULL);
7236 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7237 			goto done;
7238 		if (worktree)
7239 			repo_path =
7240 			    strdup(got_worktree_get_repo_path(worktree));
7241 		else
7242 			repo_path = strdup(cwd);
7243 		if (repo_path == NULL) {
7244 			error = got_error_from_errno("strdup");
7245 			goto done;
7246 		}
7247 	}
7248 
7249 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7250 	if (error != NULL)
7251 		goto done;
7252 
7253 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7254 	    worktree);
7255 	if (error)
7256 		goto done;
7257 
7258 	init_curses();
7259 
7260 	error = apply_unveil(got_repo_get_path(repo), NULL);
7261 	if (error)
7262 		goto done;
7263 
7264 	error = tog_load_refs(repo, 0);
7265 	if (error)
7266 		goto done;
7267 
7268 	if (commit_id_str == NULL) {
7269 		struct got_reference *head_ref;
7270 		error = got_ref_open(&head_ref, repo, worktree ?
7271 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7272 		if (error != NULL)
7273 			goto done;
7274 		error = got_ref_resolve(&commit_id, repo, head_ref);
7275 		got_ref_close(head_ref);
7276 	} else {
7277 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7278 		    repo, worktree);
7279 		if (error != NULL)
7280 			goto done;
7281 		if (keyword_idstr != NULL)
7282 			commit_id_str = keyword_idstr;
7283 
7284 		error = got_repo_match_object_id(&commit_id, NULL,
7285 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7286 	}
7287 	if (error != NULL)
7288 		goto done;
7289 
7290 	error = got_object_open_as_commit(&commit, repo, commit_id);
7291 	if (error)
7292 		goto done;
7293 
7294 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7295 	    commit, repo);
7296 	if (error)
7297 		goto done;
7298 
7299 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7300 	if (view == NULL) {
7301 		error = got_error_from_errno("view_open");
7302 		goto done;
7303 	}
7304 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7305 	    commit_id, repo);
7306 	if (error != NULL) {
7307 		if (view->close == NULL)
7308 			close_blame_view(view);
7309 		view_close(view);
7310 		goto done;
7311 	}
7312 
7313 	if (worktree) {
7314 		error = set_tog_base_commit(repo, worktree);
7315 		if (error != NULL)
7316 			goto done;
7317 
7318 		/* Release work tree lock. */
7319 		got_worktree_close(worktree);
7320 		worktree = NULL;
7321 	}
7322 
7323 	error = view_loop(view);
7324 
7325 done:
7326 	free(tog_base_commit.id);
7327 	free(repo_path);
7328 	free(in_repo_path);
7329 	free(link_target);
7330 	free(cwd);
7331 	free(commit_id);
7332 	free(keyword_idstr);
7333 	if (commit)
7334 		got_object_commit_close(commit);
7335 	if (worktree)
7336 		got_worktree_close(worktree);
7337 	if (repo) {
7338 		const struct got_error *close_err = got_repo_close(repo);
7339 		if (error == NULL)
7340 			error = close_err;
7341 	}
7342 	if (pack_fds) {
7343 		const struct got_error *pack_err =
7344 		    got_repo_pack_fds_close(pack_fds);
7345 		if (error == NULL)
7346 			error = pack_err;
7347 	}
7348 	tog_free_refs();
7349 	return error;
7350 }
7351 
7352 static const struct got_error *
7353 draw_tree_entries(struct tog_view *view, const char *parent_path)
7354 {
7355 	struct tog_tree_view_state *s = &view->state.tree;
7356 	const struct got_error *err = NULL;
7357 	struct got_tree_entry *te;
7358 	wchar_t *wline;
7359 	char *index = NULL;
7360 	struct tog_color *tc;
7361 	int width, n, nentries, scrollx, i = 1;
7362 	int limit = view->nlines;
7363 
7364 	s->ndisplayed = 0;
7365 	if (view_is_hsplit_top(view))
7366 		--limit;  /* border */
7367 
7368 	werase(view->window);
7369 
7370 	if (limit == 0)
7371 		return NULL;
7372 
7373 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7374 	    0, 0);
7375 	if (err)
7376 		return err;
7377 	if (view_needs_focus_indication(view))
7378 		wstandout(view->window);
7379 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7380 	if (tc)
7381 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7382 	waddwstr(view->window, wline);
7383 	free(wline);
7384 	wline = NULL;
7385 	while (width++ < view->ncols)
7386 		waddch(view->window, ' ');
7387 	if (tc)
7388 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7389 	if (view_needs_focus_indication(view))
7390 		wstandend(view->window);
7391 	if (--limit <= 0)
7392 		return NULL;
7393 
7394 	i += s->selected;
7395 	if (s->first_displayed_entry) {
7396 		i += got_tree_entry_get_index(s->first_displayed_entry);
7397 		if (s->tree != s->root)
7398 			++i;  /* account for ".." entry */
7399 	}
7400 	nentries = got_object_tree_get_nentries(s->tree);
7401 	if (asprintf(&index, "[%d/%d] %s",
7402 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7403 		return got_error_from_errno("asprintf");
7404 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7405 	free(index);
7406 	if (err)
7407 		return err;
7408 	waddwstr(view->window, wline);
7409 	free(wline);
7410 	wline = NULL;
7411 	if (width < view->ncols - 1)
7412 		waddch(view->window, '\n');
7413 	if (--limit <= 0)
7414 		return NULL;
7415 	waddch(view->window, '\n');
7416 	if (--limit <= 0)
7417 		return NULL;
7418 
7419 	if (s->first_displayed_entry == NULL) {
7420 		te = got_object_tree_get_first_entry(s->tree);
7421 		if (s->selected == 0) {
7422 			if (view->focussed)
7423 				wstandout(view->window);
7424 			s->selected_entry = NULL;
7425 		}
7426 		waddstr(view->window, "  ..\n");	/* parent directory */
7427 		if (s->selected == 0 && view->focussed)
7428 			wstandend(view->window);
7429 		s->ndisplayed++;
7430 		if (--limit <= 0)
7431 			return NULL;
7432 		n = 1;
7433 	} else {
7434 		n = 0;
7435 		te = s->first_displayed_entry;
7436 	}
7437 
7438 	view->maxx = 0;
7439 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7440 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7441 		const char *modestr = "";
7442 		mode_t mode;
7443 
7444 		te = got_object_tree_get_entry(s->tree, i);
7445 		mode = got_tree_entry_get_mode(te);
7446 
7447 		if (s->show_ids) {
7448 			err = got_object_id_str(&id_str,
7449 			    got_tree_entry_get_id(te));
7450 			if (err)
7451 				return got_error_from_errno(
7452 				    "got_object_id_str");
7453 		}
7454 		if (got_object_tree_entry_is_submodule(te))
7455 			modestr = "$";
7456 		else if (S_ISLNK(mode)) {
7457 			int i;
7458 
7459 			err = got_tree_entry_get_symlink_target(&link_target,
7460 			    te, s->repo);
7461 			if (err) {
7462 				free(id_str);
7463 				return err;
7464 			}
7465 			for (i = 0; link_target[i] != '\0'; i++) {
7466 				if (!isprint((unsigned char)link_target[i]))
7467 					link_target[i] = '?';
7468 			}
7469 			modestr = "@";
7470 		}
7471 		else if (S_ISDIR(mode))
7472 			modestr = "/";
7473 		else if (mode & S_IXUSR)
7474 			modestr = "*";
7475 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7476 		    got_tree_entry_get_name(te), modestr,
7477 		    link_target ? " -> ": "",
7478 		    link_target ? link_target : "") == -1) {
7479 			free(id_str);
7480 			free(link_target);
7481 			return got_error_from_errno("asprintf");
7482 		}
7483 		free(id_str);
7484 		free(link_target);
7485 
7486 		/* use full line width to determine view->maxx */
7487 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7488 		if (err) {
7489 			free(line);
7490 			break;
7491 		}
7492 		view->maxx = MAX(view->maxx, width);
7493 		free(wline);
7494 		wline = NULL;
7495 
7496 		err = format_line(&wline, &width, &scrollx, line, view->x,
7497 		    view->ncols, 0, 0);
7498 		if (err) {
7499 			free(line);
7500 			break;
7501 		}
7502 		if (n == s->selected) {
7503 			if (view->focussed)
7504 				wstandout(view->window);
7505 			s->selected_entry = te;
7506 		}
7507 		tc = match_color(&s->colors, line);
7508 		if (tc)
7509 			wattr_on(view->window,
7510 			    COLOR_PAIR(tc->colorpair), NULL);
7511 		waddwstr(view->window, &wline[scrollx]);
7512 		if (tc)
7513 			wattr_off(view->window,
7514 			    COLOR_PAIR(tc->colorpair), NULL);
7515 		if (width < view->ncols)
7516 			waddch(view->window, '\n');
7517 		if (n == s->selected && view->focussed)
7518 			wstandend(view->window);
7519 		free(line);
7520 		free(wline);
7521 		wline = NULL;
7522 		n++;
7523 		s->ndisplayed++;
7524 		s->last_displayed_entry = te;
7525 		if (--limit <= 0)
7526 			break;
7527 	}
7528 
7529 	return err;
7530 }
7531 
7532 static void
7533 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7534 {
7535 	struct got_tree_entry *te;
7536 	int isroot = s->tree == s->root;
7537 	int i = 0;
7538 
7539 	if (s->first_displayed_entry == NULL)
7540 		return;
7541 
7542 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7543 	while (i++ < maxscroll) {
7544 		if (te == NULL) {
7545 			if (!isroot)
7546 				s->first_displayed_entry = NULL;
7547 			break;
7548 		}
7549 		s->first_displayed_entry = te;
7550 		te = got_tree_entry_get_prev(s->tree, te);
7551 	}
7552 }
7553 
7554 static const struct got_error *
7555 tree_scroll_down(struct tog_view *view, int maxscroll)
7556 {
7557 	struct tog_tree_view_state *s = &view->state.tree;
7558 	struct got_tree_entry *next, *last;
7559 	int n = 0;
7560 
7561 	if (s->first_displayed_entry)
7562 		next = got_tree_entry_get_next(s->tree,
7563 		    s->first_displayed_entry);
7564 	else
7565 		next = got_object_tree_get_first_entry(s->tree);
7566 
7567 	last = s->last_displayed_entry;
7568 	while (next && n++ < maxscroll) {
7569 		if (last) {
7570 			s->last_displayed_entry = last;
7571 			last = got_tree_entry_get_next(s->tree, last);
7572 		}
7573 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7574 			s->first_displayed_entry = next;
7575 			next = got_tree_entry_get_next(s->tree, next);
7576 		}
7577 	}
7578 
7579 	return NULL;
7580 }
7581 
7582 static const struct got_error *
7583 tree_entry_path(char **path, struct tog_parent_trees *parents,
7584     struct got_tree_entry *te)
7585 {
7586 	const struct got_error *err = NULL;
7587 	struct tog_parent_tree *pt;
7588 	size_t len = 2; /* for leading slash and NUL */
7589 
7590 	TAILQ_FOREACH(pt, parents, entry)
7591 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7592 		    + 1 /* slash */;
7593 	if (te)
7594 		len += strlen(got_tree_entry_get_name(te));
7595 
7596 	*path = calloc(1, len);
7597 	if (path == NULL)
7598 		return got_error_from_errno("calloc");
7599 
7600 	(*path)[0] = '/';
7601 	pt = TAILQ_LAST(parents, tog_parent_trees);
7602 	while (pt) {
7603 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7604 		if (strlcat(*path, name, len) >= len) {
7605 			err = got_error(GOT_ERR_NO_SPACE);
7606 			goto done;
7607 		}
7608 		if (strlcat(*path, "/", len) >= len) {
7609 			err = got_error(GOT_ERR_NO_SPACE);
7610 			goto done;
7611 		}
7612 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7613 	}
7614 	if (te) {
7615 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7616 			err = got_error(GOT_ERR_NO_SPACE);
7617 			goto done;
7618 		}
7619 	}
7620 done:
7621 	if (err) {
7622 		free(*path);
7623 		*path = NULL;
7624 	}
7625 	return err;
7626 }
7627 
7628 static const struct got_error *
7629 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7630     struct got_tree_entry *te, struct tog_parent_trees *parents,
7631     struct got_object_id *commit_id, struct got_repository *repo)
7632 {
7633 	const struct got_error *err = NULL;
7634 	char *path;
7635 	struct tog_view *blame_view;
7636 
7637 	*new_view = NULL;
7638 
7639 	err = tree_entry_path(&path, parents, te);
7640 	if (err)
7641 		return err;
7642 
7643 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7644 	if (blame_view == NULL) {
7645 		err = got_error_from_errno("view_open");
7646 		goto done;
7647 	}
7648 
7649 	err = open_blame_view(blame_view, path, commit_id, repo);
7650 	if (err) {
7651 		if (err->code == GOT_ERR_CANCELLED)
7652 			err = NULL;
7653 		view_close(blame_view);
7654 	} else
7655 		*new_view = blame_view;
7656 done:
7657 	free(path);
7658 	return err;
7659 }
7660 
7661 static const struct got_error *
7662 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7663     struct tog_tree_view_state *s)
7664 {
7665 	struct tog_view *log_view;
7666 	const struct got_error *err = NULL;
7667 	char *path;
7668 
7669 	*new_view = NULL;
7670 
7671 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7672 	if (log_view == NULL)
7673 		return got_error_from_errno("view_open");
7674 
7675 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7676 	if (err)
7677 		return err;
7678 
7679 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7680 	    path, 0, NULL);
7681 	if (err)
7682 		view_close(log_view);
7683 	else
7684 		*new_view = log_view;
7685 	free(path);
7686 	return err;
7687 }
7688 
7689 static const struct got_error *
7690 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7691     const char *head_ref_name, struct got_repository *repo)
7692 {
7693 	const struct got_error *err = NULL;
7694 	char *commit_id_str = NULL;
7695 	struct tog_tree_view_state *s = &view->state.tree;
7696 	struct got_commit_object *commit = NULL;
7697 
7698 	TAILQ_INIT(&s->parents);
7699 	STAILQ_INIT(&s->colors);
7700 
7701 	s->commit_id = got_object_id_dup(commit_id);
7702 	if (s->commit_id == NULL) {
7703 		err = got_error_from_errno("got_object_id_dup");
7704 		goto done;
7705 	}
7706 
7707 	err = got_object_open_as_commit(&commit, repo, commit_id);
7708 	if (err)
7709 		goto done;
7710 
7711 	/*
7712 	 * The root is opened here and will be closed when the view is closed.
7713 	 * Any visited subtrees and their path-wise parents are opened and
7714 	 * closed on demand.
7715 	 */
7716 	err = got_object_open_as_tree(&s->root, repo,
7717 	    got_object_commit_get_tree_id(commit));
7718 	if (err)
7719 		goto done;
7720 	s->tree = s->root;
7721 
7722 	err = got_object_id_str(&commit_id_str, commit_id);
7723 	if (err != NULL)
7724 		goto done;
7725 
7726 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7727 		err = got_error_from_errno("asprintf");
7728 		goto done;
7729 	}
7730 
7731 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7732 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7733 	if (head_ref_name) {
7734 		s->head_ref_name = strdup(head_ref_name);
7735 		if (s->head_ref_name == NULL) {
7736 			err = got_error_from_errno("strdup");
7737 			goto done;
7738 		}
7739 	}
7740 	s->repo = repo;
7741 
7742 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7743 		err = add_color(&s->colors, "\\$$",
7744 		    TOG_COLOR_TREE_SUBMODULE,
7745 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7746 		if (err)
7747 			goto done;
7748 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7749 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7750 		if (err)
7751 			goto done;
7752 		err = add_color(&s->colors, "/$",
7753 		    TOG_COLOR_TREE_DIRECTORY,
7754 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7755 		if (err)
7756 			goto done;
7757 
7758 		err = add_color(&s->colors, "\\*$",
7759 		    TOG_COLOR_TREE_EXECUTABLE,
7760 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7761 		if (err)
7762 			goto done;
7763 
7764 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7765 		    get_color_value("TOG_COLOR_COMMIT"));
7766 		if (err)
7767 			goto done;
7768 	}
7769 
7770 	view->show = show_tree_view;
7771 	view->input = input_tree_view;
7772 	view->close = close_tree_view;
7773 	view->search_start = search_start_tree_view;
7774 	view->search_next = search_next_tree_view;
7775 done:
7776 	free(commit_id_str);
7777 	if (commit)
7778 		got_object_commit_close(commit);
7779 	if (err) {
7780 		if (view->close == NULL)
7781 			close_tree_view(view);
7782 		view_close(view);
7783 	}
7784 	return err;
7785 }
7786 
7787 static const struct got_error *
7788 close_tree_view(struct tog_view *view)
7789 {
7790 	struct tog_tree_view_state *s = &view->state.tree;
7791 
7792 	free_colors(&s->colors);
7793 	free(s->tree_label);
7794 	s->tree_label = NULL;
7795 	free(s->commit_id);
7796 	s->commit_id = NULL;
7797 	free(s->head_ref_name);
7798 	s->head_ref_name = NULL;
7799 	while (!TAILQ_EMPTY(&s->parents)) {
7800 		struct tog_parent_tree *parent;
7801 		parent = TAILQ_FIRST(&s->parents);
7802 		TAILQ_REMOVE(&s->parents, parent, entry);
7803 		if (parent->tree != s->root)
7804 			got_object_tree_close(parent->tree);
7805 		free(parent);
7806 
7807 	}
7808 	if (s->tree != NULL && s->tree != s->root)
7809 		got_object_tree_close(s->tree);
7810 	if (s->root)
7811 		got_object_tree_close(s->root);
7812 	return NULL;
7813 }
7814 
7815 static const struct got_error *
7816 search_start_tree_view(struct tog_view *view)
7817 {
7818 	struct tog_tree_view_state *s = &view->state.tree;
7819 
7820 	s->matched_entry = NULL;
7821 	return NULL;
7822 }
7823 
7824 static int
7825 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7826 {
7827 	regmatch_t regmatch;
7828 
7829 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7830 	    0) == 0;
7831 }
7832 
7833 static const struct got_error *
7834 search_next_tree_view(struct tog_view *view)
7835 {
7836 	struct tog_tree_view_state *s = &view->state.tree;
7837 	struct got_tree_entry *te = NULL;
7838 
7839 	if (!view->searching) {
7840 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7841 		return NULL;
7842 	}
7843 
7844 	if (s->matched_entry) {
7845 		if (view->searching == TOG_SEARCH_FORWARD) {
7846 			if (s->selected_entry)
7847 				te = got_tree_entry_get_next(s->tree,
7848 				    s->selected_entry);
7849 			else
7850 				te = got_object_tree_get_first_entry(s->tree);
7851 		} else {
7852 			if (s->selected_entry == NULL)
7853 				te = got_object_tree_get_last_entry(s->tree);
7854 			else
7855 				te = got_tree_entry_get_prev(s->tree,
7856 				    s->selected_entry);
7857 		}
7858 	} else {
7859 		if (s->selected_entry)
7860 			te = s->selected_entry;
7861 		else if (view->searching == TOG_SEARCH_FORWARD)
7862 			te = got_object_tree_get_first_entry(s->tree);
7863 		else
7864 			te = got_object_tree_get_last_entry(s->tree);
7865 	}
7866 
7867 	while (1) {
7868 		if (te == NULL) {
7869 			if (s->matched_entry == NULL) {
7870 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7871 				return NULL;
7872 			}
7873 			if (view->searching == TOG_SEARCH_FORWARD)
7874 				te = got_object_tree_get_first_entry(s->tree);
7875 			else
7876 				te = got_object_tree_get_last_entry(s->tree);
7877 		}
7878 
7879 		if (match_tree_entry(te, &view->regex)) {
7880 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7881 			s->matched_entry = te;
7882 			break;
7883 		}
7884 
7885 		if (view->searching == TOG_SEARCH_FORWARD)
7886 			te = got_tree_entry_get_next(s->tree, te);
7887 		else
7888 			te = got_tree_entry_get_prev(s->tree, te);
7889 	}
7890 
7891 	if (s->matched_entry) {
7892 		s->first_displayed_entry = s->matched_entry;
7893 		s->selected = 0;
7894 	}
7895 
7896 	return NULL;
7897 }
7898 
7899 static const struct got_error *
7900 show_tree_view(struct tog_view *view)
7901 {
7902 	const struct got_error *err = NULL;
7903 	struct tog_tree_view_state *s = &view->state.tree;
7904 	char *parent_path;
7905 
7906 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7907 	if (err)
7908 		return err;
7909 
7910 	err = draw_tree_entries(view, parent_path);
7911 	free(parent_path);
7912 
7913 	view_border(view);
7914 	return err;
7915 }
7916 
7917 static const struct got_error *
7918 tree_goto_line(struct tog_view *view, int nlines)
7919 {
7920 	const struct got_error		 *err = NULL;
7921 	struct tog_tree_view_state	 *s = &view->state.tree;
7922 	struct got_tree_entry		**fte, **lte, **ste;
7923 	int				  g, last, first = 1, i = 1;
7924 	int				  root = s->tree == s->root;
7925 	int				  off = root ? 1 : 2;
7926 
7927 	g = view->gline;
7928 	view->gline = 0;
7929 
7930 	if (g == 0)
7931 		g = 1;
7932 	else if (g > got_object_tree_get_nentries(s->tree))
7933 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7934 
7935 	fte = &s->first_displayed_entry;
7936 	lte = &s->last_displayed_entry;
7937 	ste = &s->selected_entry;
7938 
7939 	if (*fte != NULL) {
7940 		first = got_tree_entry_get_index(*fte);
7941 		first += off;  /* account for ".." */
7942 	}
7943 	last = got_tree_entry_get_index(*lte);
7944 	last += off;
7945 
7946 	if (g >= first && g <= last && g - first < nlines) {
7947 		s->selected = g - first;
7948 		return NULL;	/* gline is on the current page */
7949 	}
7950 
7951 	if (*ste != NULL) {
7952 		i = got_tree_entry_get_index(*ste);
7953 		i += off;
7954 	}
7955 
7956 	if (i < g) {
7957 		err = tree_scroll_down(view, g - i);
7958 		if (err)
7959 			return err;
7960 		if (got_tree_entry_get_index(*lte) >=
7961 		    got_object_tree_get_nentries(s->tree) - 1 &&
7962 		    first + s->selected < g &&
7963 		    s->selected < s->ndisplayed - 1) {
7964 			first = got_tree_entry_get_index(*fte);
7965 			first += off;
7966 			s->selected = g - first;
7967 		}
7968 	} else if (i > g)
7969 		tree_scroll_up(s, i - g);
7970 
7971 	if (g < nlines &&
7972 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7973 		s->selected = g - 1;
7974 
7975 	return NULL;
7976 }
7977 
7978 static const struct got_error *
7979 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7980 {
7981 	const struct got_error *err = NULL;
7982 	struct tog_tree_view_state *s = &view->state.tree;
7983 	struct got_tree_entry *te;
7984 	int n, nscroll = view->nlines - 3;
7985 
7986 	if (view->gline)
7987 		return tree_goto_line(view, nscroll);
7988 
7989 	switch (ch) {
7990 	case '0':
7991 	case '$':
7992 	case KEY_RIGHT:
7993 	case 'l':
7994 	case KEY_LEFT:
7995 	case 'h':
7996 		horizontal_scroll_input(view, ch);
7997 		break;
7998 	case 'i':
7999 		s->show_ids = !s->show_ids;
8000 		view->count = 0;
8001 		break;
8002 	case 'L':
8003 		view->count = 0;
8004 		if (!s->selected_entry)
8005 			break;
8006 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8007 		break;
8008 	case 'R':
8009 		view->count = 0;
8010 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8011 		break;
8012 	case 'g':
8013 	case '=':
8014 	case KEY_HOME:
8015 		s->selected = 0;
8016 		view->count = 0;
8017 		if (s->tree == s->root)
8018 			s->first_displayed_entry =
8019 			    got_object_tree_get_first_entry(s->tree);
8020 		else
8021 			s->first_displayed_entry = NULL;
8022 		break;
8023 	case 'G':
8024 	case '*':
8025 	case KEY_END: {
8026 		int eos = view->nlines - 3;
8027 
8028 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8029 			--eos;  /* border */
8030 		s->selected = 0;
8031 		view->count = 0;
8032 		te = got_object_tree_get_last_entry(s->tree);
8033 		for (n = 0; n < eos; n++) {
8034 			if (te == NULL) {
8035 				if (s->tree != s->root) {
8036 					s->first_displayed_entry = NULL;
8037 					n++;
8038 				}
8039 				break;
8040 			}
8041 			s->first_displayed_entry = te;
8042 			te = got_tree_entry_get_prev(s->tree, te);
8043 		}
8044 		if (n > 0)
8045 			s->selected = n - 1;
8046 		break;
8047 	}
8048 	case 'k':
8049 	case KEY_UP:
8050 	case CTRL('p'):
8051 		if (s->selected > 0) {
8052 			s->selected--;
8053 			break;
8054 		}
8055 		tree_scroll_up(s, 1);
8056 		if (s->selected_entry == NULL ||
8057 		    (s->tree == s->root && s->selected_entry ==
8058 		     got_object_tree_get_first_entry(s->tree)))
8059 			view->count = 0;
8060 		break;
8061 	case CTRL('u'):
8062 	case 'u':
8063 		nscroll /= 2;
8064 		/* FALL THROUGH */
8065 	case KEY_PPAGE:
8066 	case CTRL('b'):
8067 	case 'b':
8068 		if (s->tree == s->root) {
8069 			if (got_object_tree_get_first_entry(s->tree) ==
8070 			    s->first_displayed_entry)
8071 				s->selected -= MIN(s->selected, nscroll);
8072 		} else {
8073 			if (s->first_displayed_entry == NULL)
8074 				s->selected -= MIN(s->selected, nscroll);
8075 		}
8076 		tree_scroll_up(s, MAX(0, nscroll));
8077 		if (s->selected_entry == NULL ||
8078 		    (s->tree == s->root && s->selected_entry ==
8079 		     got_object_tree_get_first_entry(s->tree)))
8080 			view->count = 0;
8081 		break;
8082 	case 'j':
8083 	case KEY_DOWN:
8084 	case CTRL('n'):
8085 		if (s->selected < s->ndisplayed - 1) {
8086 			s->selected++;
8087 			break;
8088 		}
8089 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8090 		    == NULL) {
8091 			/* can't scroll any further */
8092 			view->count = 0;
8093 			break;
8094 		}
8095 		tree_scroll_down(view, 1);
8096 		break;
8097 	case CTRL('d'):
8098 	case 'd':
8099 		nscroll /= 2;
8100 		/* FALL THROUGH */
8101 	case KEY_NPAGE:
8102 	case CTRL('f'):
8103 	case 'f':
8104 	case ' ':
8105 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8106 		    == NULL) {
8107 			/* can't scroll any further; move cursor down */
8108 			if (s->selected < s->ndisplayed - 1)
8109 				s->selected += MIN(nscroll,
8110 				    s->ndisplayed - s->selected - 1);
8111 			else
8112 				view->count = 0;
8113 			break;
8114 		}
8115 		tree_scroll_down(view, nscroll);
8116 		break;
8117 	case KEY_ENTER:
8118 	case '\r':
8119 	case KEY_BACKSPACE:
8120 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8121 			struct tog_parent_tree *parent;
8122 			/* user selected '..' */
8123 			if (s->tree == s->root) {
8124 				view->count = 0;
8125 				break;
8126 			}
8127 			parent = TAILQ_FIRST(&s->parents);
8128 			TAILQ_REMOVE(&s->parents, parent,
8129 			    entry);
8130 			got_object_tree_close(s->tree);
8131 			s->tree = parent->tree;
8132 			s->first_displayed_entry =
8133 			    parent->first_displayed_entry;
8134 			s->selected_entry =
8135 			    parent->selected_entry;
8136 			s->selected = parent->selected;
8137 			if (s->selected > view->nlines - 3) {
8138 				err = offset_selection_down(view);
8139 				if (err)
8140 					break;
8141 			}
8142 			free(parent);
8143 		} else if (S_ISDIR(got_tree_entry_get_mode(
8144 		    s->selected_entry))) {
8145 			struct got_tree_object *subtree;
8146 			view->count = 0;
8147 			err = got_object_open_as_tree(&subtree, s->repo,
8148 			    got_tree_entry_get_id(s->selected_entry));
8149 			if (err)
8150 				break;
8151 			err = tree_view_visit_subtree(s, subtree);
8152 			if (err) {
8153 				got_object_tree_close(subtree);
8154 				break;
8155 			}
8156 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8157 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8158 		break;
8159 	case KEY_RESIZE:
8160 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8161 			s->selected = view->nlines - 4;
8162 		view->count = 0;
8163 		break;
8164 	default:
8165 		view->count = 0;
8166 		break;
8167 	}
8168 
8169 	return err;
8170 }
8171 
8172 __dead static void
8173 usage_tree(void)
8174 {
8175 	endwin();
8176 	fprintf(stderr,
8177 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8178 	    getprogname());
8179 	exit(1);
8180 }
8181 
8182 static const struct got_error *
8183 cmd_tree(int argc, char *argv[])
8184 {
8185 	const struct got_error *error;
8186 	struct got_repository *repo = NULL;
8187 	struct got_worktree *worktree = NULL;
8188 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8189 	struct got_object_id *commit_id = NULL;
8190 	struct got_commit_object *commit = NULL;
8191 	const char *commit_id_arg = NULL;
8192 	char *keyword_idstr = NULL, *label = NULL;
8193 	struct got_reference *ref = NULL;
8194 	const char *head_ref_name = NULL;
8195 	int ch;
8196 	struct tog_view *view;
8197 	int *pack_fds = NULL;
8198 
8199 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8200 		switch (ch) {
8201 		case 'c':
8202 			commit_id_arg = optarg;
8203 			break;
8204 		case 'r':
8205 			repo_path = realpath(optarg, NULL);
8206 			if (repo_path == NULL)
8207 				return got_error_from_errno2("realpath",
8208 				    optarg);
8209 			break;
8210 		default:
8211 			usage_tree();
8212 			/* NOTREACHED */
8213 		}
8214 	}
8215 
8216 	argc -= optind;
8217 	argv += optind;
8218 
8219 	if (argc > 1)
8220 		usage_tree();
8221 
8222 	error = got_repo_pack_fds_open(&pack_fds);
8223 	if (error != NULL)
8224 		goto done;
8225 
8226 	if (repo_path == NULL) {
8227 		cwd = getcwd(NULL, 0);
8228 		if (cwd == NULL)
8229 			return got_error_from_errno("getcwd");
8230 		error = got_worktree_open(&worktree, cwd, NULL);
8231 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8232 			goto done;
8233 		if (worktree)
8234 			repo_path =
8235 			    strdup(got_worktree_get_repo_path(worktree));
8236 		else
8237 			repo_path = strdup(cwd);
8238 		if (repo_path == NULL) {
8239 			error = got_error_from_errno("strdup");
8240 			goto done;
8241 		}
8242 	}
8243 
8244 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8245 	if (error != NULL)
8246 		goto done;
8247 
8248 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8249 	    repo, worktree);
8250 	if (error)
8251 		goto done;
8252 
8253 	init_curses();
8254 
8255 	error = apply_unveil(got_repo_get_path(repo), NULL);
8256 	if (error)
8257 		goto done;
8258 
8259 	error = tog_load_refs(repo, 0);
8260 	if (error)
8261 		goto done;
8262 
8263 	if (commit_id_arg == NULL) {
8264 		error = got_repo_match_object_id(&commit_id, &label,
8265 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8266 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8267 		if (error)
8268 			goto done;
8269 		head_ref_name = label;
8270 	} else {
8271 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8272 		    repo, worktree);
8273 		if (error != NULL)
8274 			goto done;
8275 		if (keyword_idstr != NULL)
8276 			commit_id_arg = keyword_idstr;
8277 
8278 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8279 		if (error == NULL)
8280 			head_ref_name = got_ref_get_name(ref);
8281 		else if (error->code != GOT_ERR_NOT_REF)
8282 			goto done;
8283 		error = got_repo_match_object_id(&commit_id, NULL,
8284 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8285 		if (error)
8286 			goto done;
8287 	}
8288 
8289 	error = got_object_open_as_commit(&commit, repo, commit_id);
8290 	if (error)
8291 		goto done;
8292 
8293 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8294 	if (view == NULL) {
8295 		error = got_error_from_errno("view_open");
8296 		goto done;
8297 	}
8298 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8299 	if (error)
8300 		goto done;
8301 	if (!got_path_is_root_dir(in_repo_path)) {
8302 		error = tree_view_walk_path(&view->state.tree, commit,
8303 		    in_repo_path);
8304 		if (error)
8305 			goto done;
8306 	}
8307 
8308 	if (worktree) {
8309 		error = set_tog_base_commit(repo, worktree);
8310 		if (error != NULL)
8311 			goto done;
8312 
8313 		/* Release work tree lock. */
8314 		got_worktree_close(worktree);
8315 		worktree = NULL;
8316 	}
8317 
8318 	error = view_loop(view);
8319 
8320 done:
8321 	free(tog_base_commit.id);
8322 	free(keyword_idstr);
8323 	free(repo_path);
8324 	free(cwd);
8325 	free(commit_id);
8326 	free(label);
8327 	if (ref)
8328 		got_ref_close(ref);
8329 	if (worktree != NULL)
8330 		got_worktree_close(worktree);
8331 	if (repo) {
8332 		const struct got_error *close_err = got_repo_close(repo);
8333 		if (error == NULL)
8334 			error = close_err;
8335 	}
8336 	if (pack_fds) {
8337 		const struct got_error *pack_err =
8338 		    got_repo_pack_fds_close(pack_fds);
8339 		if (error == NULL)
8340 			error = pack_err;
8341 	}
8342 	tog_free_refs();
8343 	return error;
8344 }
8345 
8346 static const struct got_error *
8347 ref_view_load_refs(struct tog_ref_view_state *s)
8348 {
8349 	struct got_reflist_entry *sre;
8350 	struct tog_reflist_entry *re;
8351 
8352 	s->nrefs = 0;
8353 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8354 		if (strncmp(got_ref_get_name(sre->ref),
8355 		    "refs/got/", 9) == 0 &&
8356 		    strncmp(got_ref_get_name(sre->ref),
8357 		    "refs/got/backup/", 16) != 0)
8358 			continue;
8359 
8360 		re = malloc(sizeof(*re));
8361 		if (re == NULL)
8362 			return got_error_from_errno("malloc");
8363 
8364 		re->ref = got_ref_dup(sre->ref);
8365 		if (re->ref == NULL)
8366 			return got_error_from_errno("got_ref_dup");
8367 		re->idx = s->nrefs++;
8368 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8369 	}
8370 
8371 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8372 	return NULL;
8373 }
8374 
8375 static void
8376 ref_view_free_refs(struct tog_ref_view_state *s)
8377 {
8378 	struct tog_reflist_entry *re;
8379 
8380 	while (!TAILQ_EMPTY(&s->refs)) {
8381 		re = TAILQ_FIRST(&s->refs);
8382 		TAILQ_REMOVE(&s->refs, re, entry);
8383 		got_ref_close(re->ref);
8384 		free(re);
8385 	}
8386 }
8387 
8388 static const struct got_error *
8389 open_ref_view(struct tog_view *view, struct got_repository *repo)
8390 {
8391 	const struct got_error *err = NULL;
8392 	struct tog_ref_view_state *s = &view->state.ref;
8393 
8394 	s->selected_entry = 0;
8395 	s->repo = repo;
8396 
8397 	TAILQ_INIT(&s->refs);
8398 	STAILQ_INIT(&s->colors);
8399 
8400 	err = ref_view_load_refs(s);
8401 	if (err)
8402 		goto done;
8403 
8404 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8405 		err = add_color(&s->colors, "^refs/heads/",
8406 		    TOG_COLOR_REFS_HEADS,
8407 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8408 		if (err)
8409 			goto done;
8410 
8411 		err = add_color(&s->colors, "^refs/tags/",
8412 		    TOG_COLOR_REFS_TAGS,
8413 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8414 		if (err)
8415 			goto done;
8416 
8417 		err = add_color(&s->colors, "^refs/remotes/",
8418 		    TOG_COLOR_REFS_REMOTES,
8419 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8420 		if (err)
8421 			goto done;
8422 
8423 		err = add_color(&s->colors, "^refs/got/backup/",
8424 		    TOG_COLOR_REFS_BACKUP,
8425 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8426 		if (err)
8427 			goto done;
8428 	}
8429 
8430 	view->show = show_ref_view;
8431 	view->input = input_ref_view;
8432 	view->close = close_ref_view;
8433 	view->search_start = search_start_ref_view;
8434 	view->search_next = search_next_ref_view;
8435 done:
8436 	if (err) {
8437 		if (view->close == NULL)
8438 			close_ref_view(view);
8439 		view_close(view);
8440 	}
8441 	return err;
8442 }
8443 
8444 static const struct got_error *
8445 close_ref_view(struct tog_view *view)
8446 {
8447 	struct tog_ref_view_state *s = &view->state.ref;
8448 
8449 	ref_view_free_refs(s);
8450 	free_colors(&s->colors);
8451 
8452 	return NULL;
8453 }
8454 
8455 static const struct got_error *
8456 resolve_reflist_entry(struct got_object_id **commit_id,
8457     struct tog_reflist_entry *re, struct got_repository *repo)
8458 {
8459 	const struct got_error *err = NULL;
8460 	struct got_object_id *obj_id;
8461 	struct got_tag_object *tag = NULL;
8462 	int obj_type;
8463 
8464 	*commit_id = NULL;
8465 
8466 	err = got_ref_resolve(&obj_id, repo, re->ref);
8467 	if (err)
8468 		return err;
8469 
8470 	err = got_object_get_type(&obj_type, repo, obj_id);
8471 	if (err)
8472 		goto done;
8473 
8474 	switch (obj_type) {
8475 	case GOT_OBJ_TYPE_COMMIT:
8476 		*commit_id = obj_id;
8477 		break;
8478 	case GOT_OBJ_TYPE_TAG:
8479 		err = got_object_open_as_tag(&tag, repo, obj_id);
8480 		if (err)
8481 			goto done;
8482 		free(obj_id);
8483 		err = got_object_get_type(&obj_type, repo,
8484 		    got_object_tag_get_object_id(tag));
8485 		if (err)
8486 			goto done;
8487 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8488 			err = got_error(GOT_ERR_OBJ_TYPE);
8489 			goto done;
8490 		}
8491 		*commit_id = got_object_id_dup(
8492 		    got_object_tag_get_object_id(tag));
8493 		if (*commit_id == NULL) {
8494 			err = got_error_from_errno("got_object_id_dup");
8495 			goto done;
8496 		}
8497 		break;
8498 	default:
8499 		err = got_error(GOT_ERR_OBJ_TYPE);
8500 		break;
8501 	}
8502 
8503 done:
8504 	if (tag)
8505 		got_object_tag_close(tag);
8506 	if (err) {
8507 		free(*commit_id);
8508 		*commit_id = NULL;
8509 	}
8510 	return err;
8511 }
8512 
8513 static const struct got_error *
8514 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8515     struct tog_reflist_entry *re, struct got_repository *repo)
8516 {
8517 	struct tog_view *log_view;
8518 	const struct got_error *err = NULL;
8519 	struct got_object_id *commit_id = NULL;
8520 
8521 	*new_view = NULL;
8522 
8523 	err = resolve_reflist_entry(&commit_id, re, repo);
8524 	if (err) {
8525 		if (err->code != GOT_ERR_OBJ_TYPE)
8526 			return err;
8527 		else
8528 			return NULL;
8529 	}
8530 
8531 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8532 	if (log_view == NULL) {
8533 		err = got_error_from_errno("view_open");
8534 		goto done;
8535 	}
8536 
8537 	err = open_log_view(log_view, commit_id, repo,
8538 	    got_ref_get_name(re->ref), "", 0, NULL);
8539 done:
8540 	if (err)
8541 		view_close(log_view);
8542 	else
8543 		*new_view = log_view;
8544 	free(commit_id);
8545 	return err;
8546 }
8547 
8548 static void
8549 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8550 {
8551 	struct tog_reflist_entry *re;
8552 	int i = 0;
8553 
8554 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8555 		return;
8556 
8557 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8558 	while (i++ < maxscroll) {
8559 		if (re == NULL)
8560 			break;
8561 		s->first_displayed_entry = re;
8562 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8563 	}
8564 }
8565 
8566 static const struct got_error *
8567 ref_scroll_down(struct tog_view *view, int maxscroll)
8568 {
8569 	struct tog_ref_view_state *s = &view->state.ref;
8570 	struct tog_reflist_entry *next, *last;
8571 	int n = 0;
8572 
8573 	if (s->first_displayed_entry)
8574 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8575 	else
8576 		next = TAILQ_FIRST(&s->refs);
8577 
8578 	last = s->last_displayed_entry;
8579 	while (next && n++ < maxscroll) {
8580 		if (last) {
8581 			s->last_displayed_entry = last;
8582 			last = TAILQ_NEXT(last, entry);
8583 		}
8584 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8585 			s->first_displayed_entry = next;
8586 			next = TAILQ_NEXT(next, entry);
8587 		}
8588 	}
8589 
8590 	return NULL;
8591 }
8592 
8593 static const struct got_error *
8594 search_start_ref_view(struct tog_view *view)
8595 {
8596 	struct tog_ref_view_state *s = &view->state.ref;
8597 
8598 	s->matched_entry = NULL;
8599 	return NULL;
8600 }
8601 
8602 static int
8603 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8604 {
8605 	regmatch_t regmatch;
8606 
8607 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8608 	    0) == 0;
8609 }
8610 
8611 static const struct got_error *
8612 search_next_ref_view(struct tog_view *view)
8613 {
8614 	struct tog_ref_view_state *s = &view->state.ref;
8615 	struct tog_reflist_entry *re = NULL;
8616 
8617 	if (!view->searching) {
8618 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8619 		return NULL;
8620 	}
8621 
8622 	if (s->matched_entry) {
8623 		if (view->searching == TOG_SEARCH_FORWARD) {
8624 			if (s->selected_entry)
8625 				re = TAILQ_NEXT(s->selected_entry, entry);
8626 			else
8627 				re = TAILQ_PREV(s->selected_entry,
8628 				    tog_reflist_head, entry);
8629 		} else {
8630 			if (s->selected_entry == NULL)
8631 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8632 			else
8633 				re = TAILQ_PREV(s->selected_entry,
8634 				    tog_reflist_head, entry);
8635 		}
8636 	} else {
8637 		if (s->selected_entry)
8638 			re = s->selected_entry;
8639 		else if (view->searching == TOG_SEARCH_FORWARD)
8640 			re = TAILQ_FIRST(&s->refs);
8641 		else
8642 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8643 	}
8644 
8645 	while (1) {
8646 		if (re == NULL) {
8647 			if (s->matched_entry == NULL) {
8648 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8649 				return NULL;
8650 			}
8651 			if (view->searching == TOG_SEARCH_FORWARD)
8652 				re = TAILQ_FIRST(&s->refs);
8653 			else
8654 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8655 		}
8656 
8657 		if (match_reflist_entry(re, &view->regex)) {
8658 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8659 			s->matched_entry = re;
8660 			break;
8661 		}
8662 
8663 		if (view->searching == TOG_SEARCH_FORWARD)
8664 			re = TAILQ_NEXT(re, entry);
8665 		else
8666 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8667 	}
8668 
8669 	if (s->matched_entry) {
8670 		s->first_displayed_entry = s->matched_entry;
8671 		s->selected = 0;
8672 	}
8673 
8674 	return NULL;
8675 }
8676 
8677 static const struct got_error *
8678 show_ref_view(struct tog_view *view)
8679 {
8680 	const struct got_error *err = NULL;
8681 	struct tog_ref_view_state *s = &view->state.ref;
8682 	struct tog_reflist_entry *re;
8683 	char *line = NULL;
8684 	wchar_t *wline;
8685 	struct tog_color *tc;
8686 	int width, n, scrollx;
8687 	int limit = view->nlines;
8688 
8689 	werase(view->window);
8690 
8691 	s->ndisplayed = 0;
8692 	if (view_is_hsplit_top(view))
8693 		--limit;  /* border */
8694 
8695 	if (limit == 0)
8696 		return NULL;
8697 
8698 	re = s->first_displayed_entry;
8699 
8700 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8701 	    s->nrefs) == -1)
8702 		return got_error_from_errno("asprintf");
8703 
8704 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8705 	if (err) {
8706 		free(line);
8707 		return err;
8708 	}
8709 	if (view_needs_focus_indication(view))
8710 		wstandout(view->window);
8711 	waddwstr(view->window, wline);
8712 	while (width++ < view->ncols)
8713 		waddch(view->window, ' ');
8714 	if (view_needs_focus_indication(view))
8715 		wstandend(view->window);
8716 	free(wline);
8717 	wline = NULL;
8718 	free(line);
8719 	line = NULL;
8720 	if (--limit <= 0)
8721 		return NULL;
8722 
8723 	n = 0;
8724 	view->maxx = 0;
8725 	while (re && limit > 0) {
8726 		char *line = NULL;
8727 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8728 
8729 		if (s->show_date) {
8730 			struct got_commit_object *ci;
8731 			struct got_tag_object *tag;
8732 			struct got_object_id *id;
8733 			struct tm tm;
8734 			time_t t;
8735 
8736 			err = got_ref_resolve(&id, s->repo, re->ref);
8737 			if (err)
8738 				return err;
8739 			err = got_object_open_as_tag(&tag, s->repo, id);
8740 			if (err) {
8741 				if (err->code != GOT_ERR_OBJ_TYPE) {
8742 					free(id);
8743 					return err;
8744 				}
8745 				err = got_object_open_as_commit(&ci, s->repo,
8746 				    id);
8747 				if (err) {
8748 					free(id);
8749 					return err;
8750 				}
8751 				t = got_object_commit_get_committer_time(ci);
8752 				got_object_commit_close(ci);
8753 			} else {
8754 				t = got_object_tag_get_tagger_time(tag);
8755 				got_object_tag_close(tag);
8756 			}
8757 			free(id);
8758 			if (gmtime_r(&t, &tm) == NULL)
8759 				return got_error_from_errno("gmtime_r");
8760 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8761 				return got_error(GOT_ERR_NO_SPACE);
8762 		}
8763 		if (got_ref_is_symbolic(re->ref)) {
8764 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8765 			    ymd : "", got_ref_get_name(re->ref),
8766 			    got_ref_get_symref_target(re->ref)) == -1)
8767 				return got_error_from_errno("asprintf");
8768 		} else if (s->show_ids) {
8769 			struct got_object_id *id;
8770 			char *id_str;
8771 			err = got_ref_resolve(&id, s->repo, re->ref);
8772 			if (err)
8773 				return err;
8774 			err = got_object_id_str(&id_str, id);
8775 			if (err) {
8776 				free(id);
8777 				return err;
8778 			}
8779 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8780 			    got_ref_get_name(re->ref), id_str) == -1) {
8781 				err = got_error_from_errno("asprintf");
8782 				free(id);
8783 				free(id_str);
8784 				return err;
8785 			}
8786 			free(id);
8787 			free(id_str);
8788 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8789 		    got_ref_get_name(re->ref)) == -1)
8790 			return got_error_from_errno("asprintf");
8791 
8792 		/* use full line width to determine view->maxx */
8793 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8794 		if (err) {
8795 			free(line);
8796 			return err;
8797 		}
8798 		view->maxx = MAX(view->maxx, width);
8799 		free(wline);
8800 		wline = NULL;
8801 
8802 		err = format_line(&wline, &width, &scrollx, line, view->x,
8803 		    view->ncols, 0, 0);
8804 		if (err) {
8805 			free(line);
8806 			return err;
8807 		}
8808 		if (n == s->selected) {
8809 			if (view->focussed)
8810 				wstandout(view->window);
8811 			s->selected_entry = re;
8812 		}
8813 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8814 		if (tc)
8815 			wattr_on(view->window,
8816 			    COLOR_PAIR(tc->colorpair), NULL);
8817 		waddwstr(view->window, &wline[scrollx]);
8818 		if (tc)
8819 			wattr_off(view->window,
8820 			    COLOR_PAIR(tc->colorpair), NULL);
8821 		if (width < view->ncols)
8822 			waddch(view->window, '\n');
8823 		if (n == s->selected && view->focussed)
8824 			wstandend(view->window);
8825 		free(line);
8826 		free(wline);
8827 		wline = NULL;
8828 		n++;
8829 		s->ndisplayed++;
8830 		s->last_displayed_entry = re;
8831 
8832 		limit--;
8833 		re = TAILQ_NEXT(re, entry);
8834 	}
8835 
8836 	view_border(view);
8837 	return err;
8838 }
8839 
8840 static const struct got_error *
8841 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8842     struct tog_reflist_entry *re, struct got_repository *repo)
8843 {
8844 	const struct got_error *err = NULL;
8845 	struct got_object_id *commit_id = NULL;
8846 	struct tog_view *tree_view;
8847 
8848 	*new_view = NULL;
8849 
8850 	err = resolve_reflist_entry(&commit_id, re, repo);
8851 	if (err) {
8852 		if (err->code != GOT_ERR_OBJ_TYPE)
8853 			return err;
8854 		else
8855 			return NULL;
8856 	}
8857 
8858 
8859 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8860 	if (tree_view == NULL) {
8861 		err = got_error_from_errno("view_open");
8862 		goto done;
8863 	}
8864 
8865 	err = open_tree_view(tree_view, commit_id,
8866 	    got_ref_get_name(re->ref), repo);
8867 	if (err)
8868 		goto done;
8869 
8870 	*new_view = tree_view;
8871 done:
8872 	free(commit_id);
8873 	return err;
8874 }
8875 
8876 static const struct got_error *
8877 ref_goto_line(struct tog_view *view, int nlines)
8878 {
8879 	const struct got_error		*err = NULL;
8880 	struct tog_ref_view_state	*s = &view->state.ref;
8881 	int				 g, idx = s->selected_entry->idx;
8882 
8883 	g = view->gline;
8884 	view->gline = 0;
8885 
8886 	if (g == 0)
8887 		g = 1;
8888 	else if (g > s->nrefs)
8889 		g = s->nrefs;
8890 
8891 	if (g >= s->first_displayed_entry->idx + 1 &&
8892 	    g <= s->last_displayed_entry->idx + 1 &&
8893 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8894 		s->selected = g - s->first_displayed_entry->idx - 1;
8895 		return NULL;
8896 	}
8897 
8898 	if (idx + 1 < g) {
8899 		err = ref_scroll_down(view, g - idx - 1);
8900 		if (err)
8901 			return err;
8902 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8903 		    s->first_displayed_entry->idx + s->selected < g &&
8904 		    s->selected < s->ndisplayed - 1)
8905 			s->selected = g - s->first_displayed_entry->idx - 1;
8906 	} else if (idx + 1 > g)
8907 		ref_scroll_up(s, idx - g + 1);
8908 
8909 	if (g < nlines && s->first_displayed_entry->idx == 0)
8910 		s->selected = g - 1;
8911 
8912 	return NULL;
8913 
8914 }
8915 
8916 static const struct got_error *
8917 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8918 {
8919 	const struct got_error *err = NULL;
8920 	struct tog_ref_view_state *s = &view->state.ref;
8921 	struct tog_reflist_entry *re;
8922 	int n, nscroll = view->nlines - 1;
8923 
8924 	if (view->gline)
8925 		return ref_goto_line(view, nscroll);
8926 
8927 	switch (ch) {
8928 	case '0':
8929 	case '$':
8930 	case KEY_RIGHT:
8931 	case 'l':
8932 	case KEY_LEFT:
8933 	case 'h':
8934 		horizontal_scroll_input(view, ch);
8935 		break;
8936 	case 'i':
8937 		s->show_ids = !s->show_ids;
8938 		view->count = 0;
8939 		break;
8940 	case 'm':
8941 		s->show_date = !s->show_date;
8942 		view->count = 0;
8943 		break;
8944 	case 'o':
8945 		s->sort_by_date = !s->sort_by_date;
8946 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8947 		view->count = 0;
8948 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8949 		    got_ref_cmp_by_commit_timestamp_descending :
8950 		    tog_ref_cmp_by_name, s->repo);
8951 		if (err)
8952 			break;
8953 		got_reflist_object_id_map_free(tog_refs_idmap);
8954 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8955 		    &tog_refs, s->repo);
8956 		if (err)
8957 			break;
8958 		ref_view_free_refs(s);
8959 		err = ref_view_load_refs(s);
8960 		break;
8961 	case KEY_ENTER:
8962 	case '\r':
8963 		view->count = 0;
8964 		if (!s->selected_entry)
8965 			break;
8966 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8967 		break;
8968 	case 'T':
8969 		view->count = 0;
8970 		if (!s->selected_entry)
8971 			break;
8972 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8973 		break;
8974 	case 'g':
8975 	case '=':
8976 	case KEY_HOME:
8977 		s->selected = 0;
8978 		view->count = 0;
8979 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8980 		break;
8981 	case 'G':
8982 	case '*':
8983 	case KEY_END: {
8984 		int eos = view->nlines - 1;
8985 
8986 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8987 			--eos;  /* border */
8988 		s->selected = 0;
8989 		view->count = 0;
8990 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8991 		for (n = 0; n < eos; n++) {
8992 			if (re == NULL)
8993 				break;
8994 			s->first_displayed_entry = re;
8995 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8996 		}
8997 		if (n > 0)
8998 			s->selected = n - 1;
8999 		break;
9000 	}
9001 	case 'k':
9002 	case KEY_UP:
9003 	case CTRL('p'):
9004 		if (s->selected > 0) {
9005 			s->selected--;
9006 			break;
9007 		}
9008 		ref_scroll_up(s, 1);
9009 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9010 			view->count = 0;
9011 		break;
9012 	case CTRL('u'):
9013 	case 'u':
9014 		nscroll /= 2;
9015 		/* FALL THROUGH */
9016 	case KEY_PPAGE:
9017 	case CTRL('b'):
9018 	case 'b':
9019 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9020 			s->selected -= MIN(nscroll, s->selected);
9021 		ref_scroll_up(s, MAX(0, nscroll));
9022 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9023 			view->count = 0;
9024 		break;
9025 	case 'j':
9026 	case KEY_DOWN:
9027 	case CTRL('n'):
9028 		if (s->selected < s->ndisplayed - 1) {
9029 			s->selected++;
9030 			break;
9031 		}
9032 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9033 			/* can't scroll any further */
9034 			view->count = 0;
9035 			break;
9036 		}
9037 		ref_scroll_down(view, 1);
9038 		break;
9039 	case CTRL('d'):
9040 	case 'd':
9041 		nscroll /= 2;
9042 		/* FALL THROUGH */
9043 	case KEY_NPAGE:
9044 	case CTRL('f'):
9045 	case 'f':
9046 	case ' ':
9047 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9048 			/* can't scroll any further; move cursor down */
9049 			if (s->selected < s->ndisplayed - 1)
9050 				s->selected += MIN(nscroll,
9051 				    s->ndisplayed - s->selected - 1);
9052 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9053 				s->selected += s->ndisplayed - s->selected - 1;
9054 			view->count = 0;
9055 			break;
9056 		}
9057 		ref_scroll_down(view, nscroll);
9058 		break;
9059 	case CTRL('l'):
9060 		view->count = 0;
9061 		tog_free_refs();
9062 		err = tog_load_refs(s->repo, s->sort_by_date);
9063 		if (err)
9064 			break;
9065 		ref_view_free_refs(s);
9066 		err = ref_view_load_refs(s);
9067 		break;
9068 	case KEY_RESIZE:
9069 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9070 			s->selected = view->nlines - 2;
9071 		break;
9072 	default:
9073 		view->count = 0;
9074 		break;
9075 	}
9076 
9077 	return err;
9078 }
9079 
9080 __dead static void
9081 usage_ref(void)
9082 {
9083 	endwin();
9084 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9085 	    getprogname());
9086 	exit(1);
9087 }
9088 
9089 static const struct got_error *
9090 cmd_ref(int argc, char *argv[])
9091 {
9092 	const struct got_error *error;
9093 	struct got_repository *repo = NULL;
9094 	struct got_worktree *worktree = NULL;
9095 	char *cwd = NULL, *repo_path = NULL;
9096 	int ch;
9097 	struct tog_view *view;
9098 	int *pack_fds = NULL;
9099 
9100 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9101 		switch (ch) {
9102 		case 'r':
9103 			repo_path = realpath(optarg, NULL);
9104 			if (repo_path == NULL)
9105 				return got_error_from_errno2("realpath",
9106 				    optarg);
9107 			break;
9108 		default:
9109 			usage_ref();
9110 			/* NOTREACHED */
9111 		}
9112 	}
9113 
9114 	argc -= optind;
9115 	argv += optind;
9116 
9117 	if (argc > 1)
9118 		usage_ref();
9119 
9120 	error = got_repo_pack_fds_open(&pack_fds);
9121 	if (error != NULL)
9122 		goto done;
9123 
9124 	if (repo_path == NULL) {
9125 		cwd = getcwd(NULL, 0);
9126 		if (cwd == NULL)
9127 			return got_error_from_errno("getcwd");
9128 		error = got_worktree_open(&worktree, cwd, NULL);
9129 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9130 			goto done;
9131 		if (worktree)
9132 			repo_path =
9133 			    strdup(got_worktree_get_repo_path(worktree));
9134 		else
9135 			repo_path = strdup(cwd);
9136 		if (repo_path == NULL) {
9137 			error = got_error_from_errno("strdup");
9138 			goto done;
9139 		}
9140 	}
9141 
9142 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9143 	if (error != NULL)
9144 		goto done;
9145 
9146 	init_curses();
9147 
9148 	error = apply_unveil(got_repo_get_path(repo), NULL);
9149 	if (error)
9150 		goto done;
9151 
9152 	error = tog_load_refs(repo, 0);
9153 	if (error)
9154 		goto done;
9155 
9156 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9157 	if (view == NULL) {
9158 		error = got_error_from_errno("view_open");
9159 		goto done;
9160 	}
9161 
9162 	error = open_ref_view(view, repo);
9163 	if (error)
9164 		goto done;
9165 
9166 	if (worktree) {
9167 		error = set_tog_base_commit(repo, worktree);
9168 		if (error != NULL)
9169 			goto done;
9170 
9171 		/* Release work tree lock. */
9172 		got_worktree_close(worktree);
9173 		worktree = NULL;
9174 	}
9175 
9176 	error = view_loop(view);
9177 
9178 done:
9179 	free(tog_base_commit.id);
9180 	free(repo_path);
9181 	free(cwd);
9182 	if (worktree != NULL)
9183 		got_worktree_close(worktree);
9184 	if (repo) {
9185 		const struct got_error *close_err = got_repo_close(repo);
9186 		if (close_err)
9187 			error = close_err;
9188 	}
9189 	if (pack_fds) {
9190 		const struct got_error *pack_err =
9191 		    got_repo_pack_fds_close(pack_fds);
9192 		if (error == NULL)
9193 			error = pack_err;
9194 	}
9195 	tog_free_refs();
9196 	return error;
9197 }
9198 
9199 static const struct got_error*
9200 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9201     const char *str)
9202 {
9203 	size_t len;
9204 
9205 	if (win == NULL)
9206 		win = stdscr;
9207 
9208 	len = strlen(str);
9209 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9210 
9211 	if (focus)
9212 		wstandout(win);
9213 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9214 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9215 	if (focus)
9216 		wstandend(win);
9217 
9218 	return NULL;
9219 }
9220 
9221 static const struct got_error *
9222 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9223 {
9224 	off_t *p;
9225 
9226 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9227 	if (p == NULL) {
9228 		free(*line_offsets);
9229 		*line_offsets = NULL;
9230 		return got_error_from_errno("reallocarray");
9231 	}
9232 
9233 	*line_offsets = p;
9234 	(*line_offsets)[*nlines] = off;
9235 	++(*nlines);
9236 	return NULL;
9237 }
9238 
9239 static const struct got_error *
9240 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9241 {
9242 	*ret = 0;
9243 
9244 	for (;n > 0; --n, ++km) {
9245 		char	*t0, *t, *k;
9246 		size_t	 len = 1;
9247 
9248 		if (km->keys == NULL)
9249 			continue;
9250 
9251 		t = t0 = strdup(km->keys);
9252 		if (t0 == NULL)
9253 			return got_error_from_errno("strdup");
9254 
9255 		len += strlen(t);
9256 		while ((k = strsep(&t, " ")) != NULL)
9257 			len += strlen(k) > 1 ? 2 : 0;
9258 		free(t0);
9259 		*ret = MAX(*ret, len);
9260 	}
9261 
9262 	return NULL;
9263 }
9264 
9265 /*
9266  * Write keymap section headers, keys, and key info in km to f.
9267  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9268  * wrap control and symbolic keys in guillemets, else use <>.
9269  */
9270 static const struct got_error *
9271 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9272 {
9273 	int n, len = width;
9274 
9275 	if (km->keys) {
9276 		static const char *u8_glyph[] = {
9277 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9278 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9279 		};
9280 		char	*t0, *t, *k;
9281 		int	 cs, s, first = 1;
9282 
9283 		cs = got_locale_is_utf8();
9284 
9285 		t = t0 = strdup(km->keys);
9286 		if (t0 == NULL)
9287 			return got_error_from_errno("strdup");
9288 
9289 		len = strlen(km->keys);
9290 		while ((k = strsep(&t, " ")) != NULL) {
9291 			s = strlen(k) > 1;  /* control or symbolic key */
9292 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9293 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9294 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9295 			if (n < 0) {
9296 				free(t0);
9297 				return got_error_from_errno("fprintf");
9298 			}
9299 			first = 0;
9300 			len += s ? 2 : 0;
9301 			*off += n;
9302 		}
9303 		free(t0);
9304 	}
9305 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9306 	if (n < 0)
9307 		return got_error_from_errno("fprintf");
9308 	*off += n;
9309 
9310 	return NULL;
9311 }
9312 
9313 static const struct got_error *
9314 format_help(struct tog_help_view_state *s)
9315 {
9316 	const struct got_error		*err = NULL;
9317 	off_t				 off = 0;
9318 	int				 i, max, n, show = s->all;
9319 	static const struct tog_key_map	 km[] = {
9320 #define KEYMAP_(info, type)	{ NULL, (info), type }
9321 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9322 		GENERATE_HELP
9323 #undef KEYMAP_
9324 #undef KEY_
9325 	};
9326 
9327 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9328 	if (err)
9329 		return err;
9330 
9331 	n = nitems(km);
9332 	err = max_key_str(&max, km, n);
9333 	if (err)
9334 		return err;
9335 
9336 	for (i = 0; i < n; ++i) {
9337 		if (km[i].keys == NULL) {
9338 			show = s->all;
9339 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9340 			    km[i].type == s->type || s->all)
9341 				show = 1;
9342 		}
9343 		if (show) {
9344 			err = format_help_line(&off, s->f, &km[i], max);
9345 			if (err)
9346 				return err;
9347 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9348 			if (err)
9349 				return err;
9350 		}
9351 	}
9352 	fputc('\n', s->f);
9353 	++off;
9354 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9355 	return err;
9356 }
9357 
9358 static const struct got_error *
9359 create_help(struct tog_help_view_state *s)
9360 {
9361 	FILE			*f;
9362 	const struct got_error	*err;
9363 
9364 	free(s->line_offsets);
9365 	s->line_offsets = NULL;
9366 	s->nlines = 0;
9367 
9368 	f = got_opentemp();
9369 	if (f == NULL)
9370 		return got_error_from_errno("got_opentemp");
9371 	s->f = f;
9372 
9373 	err = format_help(s);
9374 	if (err)
9375 		return err;
9376 
9377 	if (s->f && fflush(s->f) != 0)
9378 		return got_error_from_errno("fflush");
9379 
9380 	return NULL;
9381 }
9382 
9383 static const struct got_error *
9384 search_start_help_view(struct tog_view *view)
9385 {
9386 	view->state.help.matched_line = 0;
9387 	return NULL;
9388 }
9389 
9390 static void
9391 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9392     size_t *nlines, int **first, int **last, int **match, int **selected)
9393 {
9394 	struct tog_help_view_state *s = &view->state.help;
9395 
9396 	*f = s->f;
9397 	*nlines = s->nlines;
9398 	*line_offsets = s->line_offsets;
9399 	*match = &s->matched_line;
9400 	*first = &s->first_displayed_line;
9401 	*last = &s->last_displayed_line;
9402 	*selected = &s->selected_line;
9403 }
9404 
9405 static const struct got_error *
9406 show_help_view(struct tog_view *view)
9407 {
9408 	struct tog_help_view_state	*s = &view->state.help;
9409 	const struct got_error		*err;
9410 	regmatch_t			*regmatch = &view->regmatch;
9411 	wchar_t				*wline;
9412 	char				*line;
9413 	ssize_t				 linelen;
9414 	size_t				 linesz = 0;
9415 	int				 width, nprinted = 0, rc = 0;
9416 	int				 eos = view->nlines;
9417 
9418 	if (view_is_hsplit_top(view))
9419 		--eos;  /* account for border */
9420 
9421 	s->lineno = 0;
9422 	rewind(s->f);
9423 	werase(view->window);
9424 
9425 	if (view->gline > s->nlines - 1)
9426 		view->gline = s->nlines - 1;
9427 
9428 	err = win_draw_center(view->window, 0, 0, view->ncols,
9429 	    view_needs_focus_indication(view),
9430 	    "tog help (press q to return to tog)");
9431 	if (err)
9432 		return err;
9433 	if (eos <= 1)
9434 		return NULL;
9435 	waddstr(view->window, "\n\n");
9436 	eos -= 2;
9437 
9438 	s->eof = 0;
9439 	view->maxx = 0;
9440 	line = NULL;
9441 	while (eos > 0 && nprinted < eos) {
9442 		attr_t attr = 0;
9443 
9444 		linelen = getline(&line, &linesz, s->f);
9445 		if (linelen == -1) {
9446 			if (!feof(s->f)) {
9447 				free(line);
9448 				return got_ferror(s->f, GOT_ERR_IO);
9449 			}
9450 			s->eof = 1;
9451 			break;
9452 		}
9453 		if (++s->lineno < s->first_displayed_line)
9454 			continue;
9455 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9456 			continue;
9457 		if (s->lineno == view->hiline)
9458 			attr = A_STANDOUT;
9459 
9460 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9461 		    view->x ? 1 : 0);
9462 		if (err) {
9463 			free(line);
9464 			return err;
9465 		}
9466 		view->maxx = MAX(view->maxx, width);
9467 		free(wline);
9468 		wline = NULL;
9469 
9470 		if (attr)
9471 			wattron(view->window, attr);
9472 		if (s->first_displayed_line + nprinted == s->matched_line &&
9473 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9474 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9475 			    view->window, view->x, regmatch);
9476 			if (err) {
9477 				free(line);
9478 				return err;
9479 			}
9480 		} else {
9481 			int skip;
9482 
9483 			err = format_line(&wline, &width, &skip, line,
9484 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9485 			if (err) {
9486 				free(line);
9487 				return err;
9488 			}
9489 			waddwstr(view->window, &wline[skip]);
9490 			free(wline);
9491 			wline = NULL;
9492 		}
9493 		if (s->lineno == view->hiline) {
9494 			while (width++ < view->ncols)
9495 				waddch(view->window, ' ');
9496 		} else {
9497 			if (width < view->ncols)
9498 				waddch(view->window, '\n');
9499 		}
9500 		if (attr)
9501 			wattroff(view->window, attr);
9502 		if (++nprinted == 1)
9503 			s->first_displayed_line = s->lineno;
9504 	}
9505 	free(line);
9506 	if (nprinted > 0)
9507 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9508 	else
9509 		s->last_displayed_line = s->first_displayed_line;
9510 
9511 	view_border(view);
9512 
9513 	if (s->eof) {
9514 		rc = waddnstr(view->window,
9515 		    "See the tog(1) manual page for full documentation",
9516 		    view->ncols - 1);
9517 		if (rc == ERR)
9518 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9519 	} else {
9520 		wmove(view->window, view->nlines - 1, 0);
9521 		wclrtoeol(view->window);
9522 		wstandout(view->window);
9523 		rc = waddnstr(view->window, "scroll down for more...",
9524 		    view->ncols - 1);
9525 		if (rc == ERR)
9526 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9527 		if (getcurx(view->window) < view->ncols - 6) {
9528 			rc = wprintw(view->window, "[%.0f%%]",
9529 			    100.00 * s->last_displayed_line / s->nlines);
9530 			if (rc == ERR)
9531 				return got_error_msg(GOT_ERR_IO, "wprintw");
9532 		}
9533 		wstandend(view->window);
9534 	}
9535 
9536 	return NULL;
9537 }
9538 
9539 static const struct got_error *
9540 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9541 {
9542 	struct tog_help_view_state	*s = &view->state.help;
9543 	const struct got_error		*err = NULL;
9544 	char				*line = NULL;
9545 	ssize_t				 linelen;
9546 	size_t				 linesz = 0;
9547 	int				 eos, nscroll;
9548 
9549 	eos = nscroll = view->nlines;
9550 	if (view_is_hsplit_top(view))
9551 		--eos;  /* border */
9552 
9553 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9554 
9555 	switch (ch) {
9556 	case '0':
9557 	case '$':
9558 	case KEY_RIGHT:
9559 	case 'l':
9560 	case KEY_LEFT:
9561 	case 'h':
9562 		horizontal_scroll_input(view, ch);
9563 		break;
9564 	case 'g':
9565 	case KEY_HOME:
9566 		s->first_displayed_line = 1;
9567 		view->count = 0;
9568 		break;
9569 	case 'G':
9570 	case KEY_END:
9571 		view->count = 0;
9572 		if (s->eof)
9573 			break;
9574 		s->first_displayed_line = (s->nlines - eos) + 3;
9575 		s->eof = 1;
9576 		break;
9577 	case 'k':
9578 	case KEY_UP:
9579 		if (s->first_displayed_line > 1)
9580 			--s->first_displayed_line;
9581 		else
9582 			view->count = 0;
9583 		break;
9584 	case CTRL('u'):
9585 	case 'u':
9586 		nscroll /= 2;
9587 		/* FALL THROUGH */
9588 	case KEY_PPAGE:
9589 	case CTRL('b'):
9590 	case 'b':
9591 		if (s->first_displayed_line == 1) {
9592 			view->count = 0;
9593 			break;
9594 		}
9595 		while (--nscroll > 0 && s->first_displayed_line > 1)
9596 			s->first_displayed_line--;
9597 		break;
9598 	case 'j':
9599 	case KEY_DOWN:
9600 	case CTRL('n'):
9601 		if (!s->eof)
9602 			++s->first_displayed_line;
9603 		else
9604 			view->count = 0;
9605 		break;
9606 	case CTRL('d'):
9607 	case 'd':
9608 		nscroll /= 2;
9609 		/* FALL THROUGH */
9610 	case KEY_NPAGE:
9611 	case CTRL('f'):
9612 	case 'f':
9613 	case ' ':
9614 		if (s->eof) {
9615 			view->count = 0;
9616 			break;
9617 		}
9618 		while (!s->eof && --nscroll > 0) {
9619 			linelen = getline(&line, &linesz, s->f);
9620 			s->first_displayed_line++;
9621 			if (linelen == -1) {
9622 				if (feof(s->f))
9623 					s->eof = 1;
9624 				else
9625 					err = got_ferror(s->f, GOT_ERR_IO);
9626 				break;
9627 			}
9628 		}
9629 		free(line);
9630 		break;
9631 	default:
9632 		view->count = 0;
9633 		break;
9634 	}
9635 
9636 	return err;
9637 }
9638 
9639 static const struct got_error *
9640 close_help_view(struct tog_view *view)
9641 {
9642 	struct tog_help_view_state *s = &view->state.help;
9643 
9644 	free(s->line_offsets);
9645 	s->line_offsets = NULL;
9646 	if (fclose(s->f) == EOF)
9647 		return got_error_from_errno("fclose");
9648 
9649 	return NULL;
9650 }
9651 
9652 static const struct got_error *
9653 reset_help_view(struct tog_view *view)
9654 {
9655 	struct tog_help_view_state *s = &view->state.help;
9656 
9657 
9658 	if (s->f && fclose(s->f) == EOF)
9659 		return got_error_from_errno("fclose");
9660 
9661 	wclear(view->window);
9662 	view->count = 0;
9663 	view->x = 0;
9664 	s->all = !s->all;
9665 	s->first_displayed_line = 1;
9666 	s->last_displayed_line = view->nlines;
9667 	s->matched_line = 0;
9668 
9669 	return create_help(s);
9670 }
9671 
9672 static const struct got_error *
9673 open_help_view(struct tog_view *view, struct tog_view *parent)
9674 {
9675 	const struct got_error		*err = NULL;
9676 	struct tog_help_view_state	*s = &view->state.help;
9677 
9678 	s->type = (enum tog_keymap_type)parent->type;
9679 	s->first_displayed_line = 1;
9680 	s->last_displayed_line = view->nlines;
9681 	s->selected_line = 1;
9682 
9683 	view->show = show_help_view;
9684 	view->input = input_help_view;
9685 	view->reset = reset_help_view;
9686 	view->close = close_help_view;
9687 	view->search_start = search_start_help_view;
9688 	view->search_setup = search_setup_help_view;
9689 	view->search_next = search_next_view_match;
9690 
9691 	err = create_help(s);
9692 	return err;
9693 }
9694 
9695 static const struct got_error *
9696 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9697     enum tog_view_type request, int y, int x)
9698 {
9699 	const struct got_error *err = NULL;
9700 
9701 	*new_view = NULL;
9702 
9703 	switch (request) {
9704 	case TOG_VIEW_DIFF:
9705 		if (view->type == TOG_VIEW_LOG) {
9706 			struct tog_log_view_state *s = &view->state.log;
9707 
9708 			err = open_diff_view_for_commit(new_view, y, x,
9709 			    s->selected_entry->commit, s->selected_entry->id,
9710 			    view, s->repo);
9711 		} else
9712 			return got_error_msg(GOT_ERR_NOT_IMPL,
9713 			    "parent/child view pair not supported");
9714 		break;
9715 	case TOG_VIEW_BLAME:
9716 		if (view->type == TOG_VIEW_TREE) {
9717 			struct tog_tree_view_state *s = &view->state.tree;
9718 
9719 			err = blame_tree_entry(new_view, y, x,
9720 			    s->selected_entry, &s->parents, s->commit_id,
9721 			    s->repo);
9722 		} else
9723 			return got_error_msg(GOT_ERR_NOT_IMPL,
9724 			    "parent/child view pair not supported");
9725 		break;
9726 	case TOG_VIEW_LOG:
9727 		if (view->type == TOG_VIEW_BLAME)
9728 			err = log_annotated_line(new_view, y, x,
9729 			    view->state.blame.repo, view->state.blame.id_to_log);
9730 		else if (view->type == TOG_VIEW_TREE)
9731 			err = log_selected_tree_entry(new_view, y, x,
9732 			    &view->state.tree);
9733 		else if (view->type == TOG_VIEW_REF)
9734 			err = log_ref_entry(new_view, y, x,
9735 			    view->state.ref.selected_entry,
9736 			    view->state.ref.repo);
9737 		else
9738 			return got_error_msg(GOT_ERR_NOT_IMPL,
9739 			    "parent/child view pair not supported");
9740 		break;
9741 	case TOG_VIEW_TREE:
9742 		if (view->type == TOG_VIEW_LOG)
9743 			err = browse_commit_tree(new_view, y, x,
9744 			    view->state.log.selected_entry,
9745 			    view->state.log.in_repo_path,
9746 			    view->state.log.head_ref_name,
9747 			    view->state.log.repo);
9748 		else if (view->type == TOG_VIEW_REF)
9749 			err = browse_ref_tree(new_view, y, x,
9750 			    view->state.ref.selected_entry,
9751 			    view->state.ref.repo);
9752 		else
9753 			return got_error_msg(GOT_ERR_NOT_IMPL,
9754 			    "parent/child view pair not supported");
9755 		break;
9756 	case TOG_VIEW_REF:
9757 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9758 		if (*new_view == NULL)
9759 			return got_error_from_errno("view_open");
9760 		if (view->type == TOG_VIEW_LOG)
9761 			err = open_ref_view(*new_view, view->state.log.repo);
9762 		else if (view->type == TOG_VIEW_TREE)
9763 			err = open_ref_view(*new_view, view->state.tree.repo);
9764 		else
9765 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9766 			    "parent/child view pair not supported");
9767 		if (err)
9768 			view_close(*new_view);
9769 		break;
9770 	case TOG_VIEW_HELP:
9771 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9772 		if (*new_view == NULL)
9773 			return got_error_from_errno("view_open");
9774 		err = open_help_view(*new_view, view);
9775 		if (err)
9776 			view_close(*new_view);
9777 		break;
9778 	default:
9779 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9780 	}
9781 
9782 	return err;
9783 }
9784 
9785 /*
9786  * If view was scrolled down to move the selected line into view when opening a
9787  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9788  */
9789 static void
9790 offset_selection_up(struct tog_view *view)
9791 {
9792 	switch (view->type) {
9793 	case TOG_VIEW_BLAME: {
9794 		struct tog_blame_view_state *s = &view->state.blame;
9795 		if (s->first_displayed_line == 1) {
9796 			s->selected_line = MAX(s->selected_line - view->offset,
9797 			    1);
9798 			break;
9799 		}
9800 		if (s->first_displayed_line > view->offset)
9801 			s->first_displayed_line -= view->offset;
9802 		else
9803 			s->first_displayed_line = 1;
9804 		s->selected_line += view->offset;
9805 		break;
9806 	}
9807 	case TOG_VIEW_LOG:
9808 		log_scroll_up(&view->state.log, view->offset);
9809 		view->state.log.selected += view->offset;
9810 		break;
9811 	case TOG_VIEW_REF:
9812 		ref_scroll_up(&view->state.ref, view->offset);
9813 		view->state.ref.selected += view->offset;
9814 		break;
9815 	case TOG_VIEW_TREE:
9816 		tree_scroll_up(&view->state.tree, view->offset);
9817 		view->state.tree.selected += view->offset;
9818 		break;
9819 	default:
9820 		break;
9821 	}
9822 
9823 	view->offset = 0;
9824 }
9825 
9826 /*
9827  * If the selected line is in the section of screen covered by the bottom split,
9828  * scroll down offset lines to move it into view and index its new position.
9829  */
9830 static const struct got_error *
9831 offset_selection_down(struct tog_view *view)
9832 {
9833 	const struct got_error	*err = NULL;
9834 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9835 	int			*selected = NULL;
9836 	int			 header, offset;
9837 
9838 	switch (view->type) {
9839 	case TOG_VIEW_BLAME: {
9840 		struct tog_blame_view_state *s = &view->state.blame;
9841 		header = 3;
9842 		scrolld = NULL;
9843 		if (s->selected_line > view->nlines - header) {
9844 			offset = abs(view->nlines - s->selected_line - header);
9845 			s->first_displayed_line += offset;
9846 			s->selected_line -= offset;
9847 			view->offset = offset;
9848 		}
9849 		break;
9850 	}
9851 	case TOG_VIEW_LOG: {
9852 		struct tog_log_view_state *s = &view->state.log;
9853 		scrolld = &log_scroll_down;
9854 		header = view_is_parent_view(view) ? 3 : 2;
9855 		selected = &s->selected;
9856 		break;
9857 	}
9858 	case TOG_VIEW_REF: {
9859 		struct tog_ref_view_state *s = &view->state.ref;
9860 		scrolld = &ref_scroll_down;
9861 		header = 3;
9862 		selected = &s->selected;
9863 		break;
9864 	}
9865 	case TOG_VIEW_TREE: {
9866 		struct tog_tree_view_state *s = &view->state.tree;
9867 		scrolld = &tree_scroll_down;
9868 		header = 5;
9869 		selected = &s->selected;
9870 		break;
9871 	}
9872 	default:
9873 		selected = NULL;
9874 		scrolld = NULL;
9875 		header = 0;
9876 		break;
9877 	}
9878 
9879 	if (selected && *selected > view->nlines - header) {
9880 		offset = abs(view->nlines - *selected - header);
9881 		view->offset = offset;
9882 		if (scrolld && offset) {
9883 			err = scrolld(view, offset);
9884 			*selected -= offset;
9885 		}
9886 	}
9887 
9888 	return err;
9889 }
9890 
9891 static void
9892 list_commands(FILE *fp)
9893 {
9894 	size_t i;
9895 
9896 	fprintf(fp, "commands:");
9897 	for (i = 0; i < nitems(tog_commands); i++) {
9898 		const struct tog_cmd *cmd = &tog_commands[i];
9899 		fprintf(fp, " %s", cmd->name);
9900 	}
9901 	fputc('\n', fp);
9902 }
9903 
9904 __dead static void
9905 usage(int hflag, int status)
9906 {
9907 	FILE *fp = (status == 0) ? stdout : stderr;
9908 
9909 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9910 	    getprogname());
9911 	if (hflag) {
9912 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9913 		list_commands(fp);
9914 	}
9915 	exit(status);
9916 }
9917 
9918 static char **
9919 make_argv(int argc, ...)
9920 {
9921 	va_list ap;
9922 	char **argv;
9923 	int i;
9924 
9925 	va_start(ap, argc);
9926 
9927 	argv = calloc(argc, sizeof(char *));
9928 	if (argv == NULL)
9929 		err(1, "calloc");
9930 	for (i = 0; i < argc; i++) {
9931 		argv[i] = strdup(va_arg(ap, char *));
9932 		if (argv[i] == NULL)
9933 			err(1, "strdup");
9934 	}
9935 
9936 	va_end(ap);
9937 	return argv;
9938 }
9939 
9940 /*
9941  * Try to convert 'tog path' into a 'tog log path' command.
9942  * The user could simply have mistyped the command rather than knowingly
9943  * provided a path. So check whether argv[0] can in fact be resolved
9944  * to a path in the HEAD commit and print a special error if not.
9945  * This hack is for mpi@ <3
9946  */
9947 static const struct got_error *
9948 tog_log_with_path(int argc, char *argv[])
9949 {
9950 	const struct got_error *error = NULL, *close_err;
9951 	const struct tog_cmd *cmd = NULL;
9952 	struct got_repository *repo = NULL;
9953 	struct got_worktree *worktree = NULL;
9954 	struct got_object_id *commit_id = NULL, *id = NULL;
9955 	struct got_commit_object *commit = NULL;
9956 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9957 	char *commit_id_str = NULL, **cmd_argv = NULL;
9958 	int *pack_fds = NULL;
9959 
9960 	cwd = getcwd(NULL, 0);
9961 	if (cwd == NULL)
9962 		return got_error_from_errno("getcwd");
9963 
9964 	error = got_repo_pack_fds_open(&pack_fds);
9965 	if (error != NULL)
9966 		goto done;
9967 
9968 	error = got_worktree_open(&worktree, cwd, NULL);
9969 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9970 		goto done;
9971 
9972 	if (worktree)
9973 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9974 	else
9975 		repo_path = strdup(cwd);
9976 	if (repo_path == NULL) {
9977 		error = got_error_from_errno("strdup");
9978 		goto done;
9979 	}
9980 
9981 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9982 	if (error != NULL)
9983 		goto done;
9984 
9985 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9986 	    repo, worktree);
9987 	if (error)
9988 		goto done;
9989 
9990 	error = tog_load_refs(repo, 0);
9991 	if (error)
9992 		goto done;
9993 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9994 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9995 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9996 	if (error)
9997 		goto done;
9998 
9999 	if (worktree) {
10000 		got_worktree_close(worktree);
10001 		worktree = NULL;
10002 	}
10003 
10004 	error = got_object_open_as_commit(&commit, repo, commit_id);
10005 	if (error)
10006 		goto done;
10007 
10008 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10009 	if (error) {
10010 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10011 			goto done;
10012 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10013 		    getprogname(), argv[0]);
10014 		usage(1, 1);
10015 		/* not reached */
10016 	}
10017 
10018 	error = got_object_id_str(&commit_id_str, commit_id);
10019 	if (error)
10020 		goto done;
10021 
10022 	cmd = &tog_commands[0]; /* log */
10023 	argc = 4;
10024 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10025 	error = cmd->cmd_main(argc, cmd_argv);
10026 done:
10027 	if (repo) {
10028 		close_err = got_repo_close(repo);
10029 		if (error == NULL)
10030 			error = close_err;
10031 	}
10032 	if (commit)
10033 		got_object_commit_close(commit);
10034 	if (worktree)
10035 		got_worktree_close(worktree);
10036 	if (pack_fds) {
10037 		const struct got_error *pack_err =
10038 		    got_repo_pack_fds_close(pack_fds);
10039 		if (error == NULL)
10040 			error = pack_err;
10041 	}
10042 	free(id);
10043 	free(commit_id_str);
10044 	free(commit_id);
10045 	free(cwd);
10046 	free(repo_path);
10047 	free(in_repo_path);
10048 	if (cmd_argv) {
10049 		int i;
10050 		for (i = 0; i < argc; i++)
10051 			free(cmd_argv[i]);
10052 		free(cmd_argv);
10053 	}
10054 	tog_free_refs();
10055 	return error;
10056 }
10057 
10058 int
10059 main(int argc, char *argv[])
10060 {
10061 	const struct got_error *io_err, *error = NULL;
10062 	const struct tog_cmd *cmd = NULL;
10063 	int ch, hflag = 0, Vflag = 0;
10064 	char **cmd_argv = NULL;
10065 	static const struct option longopts[] = {
10066 	    { "version", no_argument, NULL, 'V' },
10067 	    { NULL, 0, NULL, 0}
10068 	};
10069 	char *diff_algo_str = NULL;
10070 	const char *test_script_path;
10071 
10072 	setlocale(LC_CTYPE, "");
10073 
10074 	/*
10075 	 * Override default signal handlers before starting ncurses.
10076 	 * This should prevent ncurses from installing its own
10077 	 * broken cleanup() signal handler.
10078 	 */
10079 	signal(SIGWINCH, tog_sigwinch);
10080 	signal(SIGPIPE, tog_sigpipe);
10081 	signal(SIGCONT, tog_sigcont);
10082 	signal(SIGINT, tog_sigint);
10083 	signal(SIGTERM, tog_sigterm);
10084 
10085 	/*
10086 	 * Test mode init must happen before pledge() because "tty" will
10087 	 * not allow TTY-related ioctls to occur via regular files.
10088 	 */
10089 	test_script_path = getenv("TOG_TEST_SCRIPT");
10090 	if (test_script_path != NULL) {
10091 		error = init_mock_term(test_script_path);
10092 		if (error) {
10093 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10094 			return 1;
10095 		}
10096 	} else if (!isatty(STDIN_FILENO))
10097 		errx(1, "standard input is not a tty");
10098 
10099 #if !defined(PROFILE)
10100 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10101 	    NULL) == -1)
10102 		err(1, "pledge");
10103 #endif
10104 
10105 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10106 		switch (ch) {
10107 		case 'h':
10108 			hflag = 1;
10109 			break;
10110 		case 'V':
10111 			Vflag = 1;
10112 			break;
10113 		default:
10114 			usage(hflag, 1);
10115 			/* NOTREACHED */
10116 		}
10117 	}
10118 
10119 	argc -= optind;
10120 	argv += optind;
10121 	optind = 1;
10122 	optreset = 1;
10123 
10124 	if (Vflag) {
10125 		got_version_print_str();
10126 		return 0;
10127 	}
10128 
10129 	if (argc == 0) {
10130 		if (hflag)
10131 			usage(hflag, 0);
10132 		/* Build an argument vector which runs a default command. */
10133 		cmd = &tog_commands[0];
10134 		argc = 1;
10135 		cmd_argv = make_argv(argc, cmd->name);
10136 	} else {
10137 		size_t i;
10138 
10139 		/* Did the user specify a command? */
10140 		for (i = 0; i < nitems(tog_commands); i++) {
10141 			if (strncmp(tog_commands[i].name, argv[0],
10142 			    strlen(argv[0])) == 0) {
10143 				cmd = &tog_commands[i];
10144 				break;
10145 			}
10146 		}
10147 	}
10148 
10149 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10150 	if (diff_algo_str) {
10151 		if (strcasecmp(diff_algo_str, "patience") == 0)
10152 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10153 		if (strcasecmp(diff_algo_str, "myers") == 0)
10154 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10155 	}
10156 
10157 	tog_base_commit.idx = -1;
10158 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10159 
10160 	if (cmd == NULL) {
10161 		if (argc != 1)
10162 			usage(0, 1);
10163 		/* No command specified; try log with a path */
10164 		error = tog_log_with_path(argc, argv);
10165 	} else {
10166 		if (hflag)
10167 			cmd->cmd_usage();
10168 		else
10169 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10170 	}
10171 
10172 	if (using_mock_io) {
10173 		io_err = tog_io_close();
10174 		if (error == NULL)
10175 			error = io_err;
10176 	}
10177 	endwin();
10178 	if (cmd_argv) {
10179 		int i;
10180 		for (i = 0; i < argc; i++)
10181 			free(cmd_argv[i]);
10182 		free(cmd_argv);
10183 	}
10184 
10185 	if (error && error->code != GOT_ERR_CANCELLED &&
10186 	    error->code != GOT_ERR_EOF &&
10187 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10188 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10189 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10190 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10191 		return 1;
10192 	}
10193 	return 0;
10194 }