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->search_entry = s->selected_entry;
3725 			s->thread_args.commits_needed++;
3726 			return trigger_log_thread(view, 0);
3727 		}
3728 
3729 		err = match_commit(&have_match, entry->id, entry->commit,
3730 		    &view->regex);
3731 		if (err)
3732 			break;
3733 		if (have_match) {
3734 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3735 			s->matched_entry = entry;
3736 			break;
3737 		}
3738 
3739 		s->search_entry = entry;
3740 		if (view->searching == TOG_SEARCH_FORWARD)
3741 			entry = TAILQ_NEXT(entry, entry);
3742 		else
3743 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3744 	}
3745 
3746 	if (s->matched_entry) {
3747 		int cur = s->selected_entry->idx;
3748 		while (cur < s->matched_entry->idx) {
3749 			err = input_log_view(NULL, view, KEY_DOWN);
3750 			if (err)
3751 				return err;
3752 			cur++;
3753 		}
3754 		while (cur > s->matched_entry->idx) {
3755 			err = input_log_view(NULL, view, KEY_UP);
3756 			if (err)
3757 				return err;
3758 			cur--;
3759 		}
3760 	}
3761 
3762 	s->search_entry = NULL;
3763 
3764 	return NULL;
3765 }
3766 
3767 static const struct got_error *
3768 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3769     struct got_repository *repo, const char *head_ref_name,
3770     const char *in_repo_path, int log_branches,
3771     struct got_worktree *worktree)
3772 {
3773 	const struct got_error *err = NULL;
3774 	struct tog_log_view_state *s = &view->state.log;
3775 	struct got_repository *thread_repo = NULL;
3776 	struct got_commit_graph *thread_graph = NULL;
3777 	int errcode;
3778 
3779 	if (in_repo_path != s->in_repo_path) {
3780 		free(s->in_repo_path);
3781 		s->in_repo_path = strdup(in_repo_path);
3782 		if (s->in_repo_path == NULL) {
3783 			err = got_error_from_errno("strdup");
3784 			goto done;
3785 		}
3786 	}
3787 
3788 	/* The commit queue only contains commits being displayed. */
3789 	TAILQ_INIT(&s->real_commits.head);
3790 	s->real_commits.ncommits = 0;
3791 	s->commits = &s->real_commits;
3792 
3793 	TAILQ_INIT(&s->limit_commits.head);
3794 	s->limit_view = 0;
3795 	s->limit_commits.ncommits = 0;
3796 
3797 	s->repo = repo;
3798 	if (head_ref_name) {
3799 		s->head_ref_name = strdup(head_ref_name);
3800 		if (s->head_ref_name == NULL) {
3801 			err = got_error_from_errno("strdup");
3802 			goto done;
3803 		}
3804 	}
3805 	s->start_id = got_object_id_dup(start_id);
3806 	if (s->start_id == NULL) {
3807 		err = got_error_from_errno("got_object_id_dup");
3808 		goto done;
3809 	}
3810 	s->log_branches = log_branches;
3811 	s->use_committer = 1;
3812 
3813 	STAILQ_INIT(&s->colors);
3814 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3815 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3816 		    get_color_value("TOG_COLOR_COMMIT"));
3817 		if (err)
3818 			goto done;
3819 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3820 		    get_color_value("TOG_COLOR_AUTHOR"));
3821 		if (err) {
3822 			free_colors(&s->colors);
3823 			goto done;
3824 		}
3825 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3826 		    get_color_value("TOG_COLOR_DATE"));
3827 		if (err) {
3828 			free_colors(&s->colors);
3829 			goto done;
3830 		}
3831 	}
3832 
3833 	view->show = show_log_view;
3834 	view->input = input_log_view;
3835 	view->resize = resize_log_view;
3836 	view->close = close_log_view;
3837 	view->search_start = search_start_log_view;
3838 	view->search_next = search_next_log_view;
3839 
3840 	if (s->thread_args.pack_fds == NULL) {
3841 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3842 		if (err)
3843 			goto done;
3844 	}
3845 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3846 	    s->thread_args.pack_fds);
3847 	if (err)
3848 		goto done;
3849 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3850 	    !s->log_branches);
3851 	if (err)
3852 		goto done;
3853 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3854 	    s->repo, NULL, NULL);
3855 	if (err)
3856 		goto done;
3857 
3858 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3859 	if (errcode) {
3860 		err = got_error_set_errno(errcode, "pthread_cond_init");
3861 		goto done;
3862 	}
3863 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3864 	if (errcode) {
3865 		err = got_error_set_errno(errcode, "pthread_cond_init");
3866 		goto done;
3867 	}
3868 
3869 	if (using_mock_io) {
3870 		int rc;
3871 
3872 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3873 		if (rc)
3874 			return got_error_set_errno(rc, "pthread_cond_init");
3875 	}
3876 
3877 	s->thread_args.commits_needed = view->nlines;
3878 	s->thread_args.graph = thread_graph;
3879 	s->thread_args.real_commits = &s->real_commits;
3880 	s->thread_args.limit_commits = &s->limit_commits;
3881 	s->thread_args.in_repo_path = s->in_repo_path;
3882 	s->thread_args.start_id = s->start_id;
3883 	s->thread_args.repo = thread_repo;
3884 	s->thread_args.log_complete = 0;
3885 	s->thread_args.quit = &s->quit;
3886 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3887 	s->thread_args.selected_entry = &s->selected_entry;
3888 	s->thread_args.searching = &view->searching;
3889 	s->thread_args.search_next_done = &view->search_next_done;
3890 	s->thread_args.regex = &view->regex;
3891 	s->thread_args.limiting = &s->limit_view;
3892 	s->thread_args.limit_regex = &s->limit_regex;
3893 	s->thread_args.limit_commits = &s->limit_commits;
3894 	s->thread_args.worktree = worktree;
3895 	if (worktree)
3896 		s->thread_args.need_commit_marker = 1;
3897 done:
3898 	if (err) {
3899 		if (view->close == NULL)
3900 			close_log_view(view);
3901 		view_close(view);
3902 	}
3903 	return err;
3904 }
3905 
3906 static const struct got_error *
3907 show_log_view(struct tog_view *view)
3908 {
3909 	const struct got_error *err;
3910 	struct tog_log_view_state *s = &view->state.log;
3911 
3912 	if (s->thread == NULL) {
3913 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3914 		    &s->thread_args);
3915 		if (errcode)
3916 			return got_error_set_errno(errcode, "pthread_create");
3917 		if (s->thread_args.commits_needed > 0) {
3918 			err = trigger_log_thread(view, 1);
3919 			if (err)
3920 				return err;
3921 		}
3922 	}
3923 
3924 	return draw_commits(view);
3925 }
3926 
3927 static void
3928 log_move_cursor_up(struct tog_view *view, int page, int home)
3929 {
3930 	struct tog_log_view_state *s = &view->state.log;
3931 
3932 	if (s->first_displayed_entry == NULL)
3933 		return;
3934 	if (s->selected_entry->idx == 0)
3935 		view->count = 0;
3936 
3937 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3938 	    || home)
3939 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3940 
3941 	if (!page && !home && s->selected > 0)
3942 		--s->selected;
3943 	else
3944 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3945 
3946 	select_commit(s);
3947 	return;
3948 }
3949 
3950 static const struct got_error *
3951 log_move_cursor_down(struct tog_view *view, int page)
3952 {
3953 	struct tog_log_view_state	*s = &view->state.log;
3954 	const struct got_error		*err = NULL;
3955 	int				 eos = view->nlines - 2;
3956 
3957 	if (s->first_displayed_entry == NULL)
3958 		return NULL;
3959 
3960 	if (s->thread_args.log_complete &&
3961 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3962 		return NULL;
3963 
3964 	if (view_is_hsplit_top(view))
3965 		--eos;  /* border consumes the last line */
3966 
3967 	if (!page) {
3968 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3969 			++s->selected;
3970 		else
3971 			err = log_scroll_down(view, 1);
3972 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3973 		struct commit_queue_entry *entry;
3974 		int n;
3975 
3976 		s->selected = 0;
3977 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3978 		s->last_displayed_entry = entry;
3979 		for (n = 0; n <= eos; n++) {
3980 			if (entry == NULL)
3981 				break;
3982 			s->first_displayed_entry = entry;
3983 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3984 		}
3985 		if (n > 0)
3986 			s->selected = n - 1;
3987 	} else {
3988 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3989 		    s->thread_args.log_complete)
3990 			s->selected += MIN(page,
3991 			    s->commits->ncommits - s->selected_entry->idx - 1);
3992 		else
3993 			err = log_scroll_down(view, page);
3994 	}
3995 	if (err)
3996 		return err;
3997 
3998 	/*
3999 	 * We might necessarily overshoot in horizontal
4000 	 * splits; if so, select the last displayed commit.
4001 	 */
4002 	if (s->first_displayed_entry && s->last_displayed_entry) {
4003 		s->selected = MIN(s->selected,
4004 		    s->last_displayed_entry->idx -
4005 		    s->first_displayed_entry->idx);
4006 	}
4007 
4008 	select_commit(s);
4009 
4010 	if (s->thread_args.log_complete &&
4011 	    s->selected_entry->idx == s->commits->ncommits - 1)
4012 		view->count = 0;
4013 
4014 	return NULL;
4015 }
4016 
4017 static void
4018 view_get_split(struct tog_view *view, int *y, int *x)
4019 {
4020 	*x = 0;
4021 	*y = 0;
4022 
4023 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4024 		if (view->child && view->child->resized_y)
4025 			*y = view->child->resized_y;
4026 		else if (view->resized_y)
4027 			*y = view->resized_y;
4028 		else
4029 			*y = view_split_begin_y(view->lines);
4030 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4031 		if (view->child && view->child->resized_x)
4032 			*x = view->child->resized_x;
4033 		else if (view->resized_x)
4034 			*x = view->resized_x;
4035 		else
4036 			*x = view_split_begin_x(view->begin_x);
4037 	}
4038 }
4039 
4040 /* Split view horizontally at y and offset view->state->selected line. */
4041 static const struct got_error *
4042 view_init_hsplit(struct tog_view *view, int y)
4043 {
4044 	const struct got_error *err = NULL;
4045 
4046 	view->nlines = y;
4047 	view->ncols = COLS;
4048 	err = view_resize(view);
4049 	if (err)
4050 		return err;
4051 
4052 	err = offset_selection_down(view);
4053 
4054 	return err;
4055 }
4056 
4057 static const struct got_error *
4058 log_goto_line(struct tog_view *view, int nlines)
4059 {
4060 	const struct got_error		*err = NULL;
4061 	struct tog_log_view_state	*s = &view->state.log;
4062 	int				 g, idx = s->selected_entry->idx;
4063 
4064 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4065 		return NULL;
4066 
4067 	g = view->gline;
4068 	view->gline = 0;
4069 
4070 	if (g >= s->first_displayed_entry->idx + 1 &&
4071 	    g <= s->last_displayed_entry->idx + 1 &&
4072 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4073 		s->selected = g - s->first_displayed_entry->idx - 1;
4074 		select_commit(s);
4075 		return NULL;
4076 	}
4077 
4078 	if (idx + 1 < g) {
4079 		err = log_move_cursor_down(view, g - idx - 1);
4080 		if (!err && g > s->selected_entry->idx + 1)
4081 			err = log_move_cursor_down(view,
4082 			    g - s->first_displayed_entry->idx - 1);
4083 		if (err)
4084 			return err;
4085 	} else if (idx + 1 > g)
4086 		log_move_cursor_up(view, idx - g + 1, 0);
4087 
4088 	if (g < nlines && s->first_displayed_entry->idx == 0)
4089 		s->selected = g - 1;
4090 
4091 	select_commit(s);
4092 	return NULL;
4093 
4094 }
4095 
4096 static void
4097 horizontal_scroll_input(struct tog_view *view, int ch)
4098 {
4099 
4100 	switch (ch) {
4101 	case KEY_LEFT:
4102 	case 'h':
4103 		view->x -= MIN(view->x, 2);
4104 		if (view->x <= 0)
4105 			view->count = 0;
4106 		break;
4107 	case KEY_RIGHT:
4108 	case 'l':
4109 		if (view->x + view->ncols / 2 < view->maxx)
4110 			view->x += 2;
4111 		else
4112 			view->count = 0;
4113 		break;
4114 	case '0':
4115 		view->x = 0;
4116 		break;
4117 	case '$':
4118 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4119 		view->count = 0;
4120 		break;
4121 	default:
4122 		break;
4123 	}
4124 }
4125 
4126 static const struct got_error *
4127 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4128 {
4129 	const struct got_error *err = NULL;
4130 	struct tog_log_view_state *s = &view->state.log;
4131 	int eos, nscroll;
4132 
4133 	if (s->thread_args.load_all) {
4134 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4135 			s->thread_args.load_all = 0;
4136 		else if (s->thread_args.log_complete) {
4137 			err = log_move_cursor_down(view, s->commits->ncommits);
4138 			s->thread_args.load_all = 0;
4139 		}
4140 		if (err)
4141 			return err;
4142 	}
4143 
4144 	eos = nscroll = view->nlines - 1;
4145 	if (view_is_hsplit_top(view))
4146 		--eos;  /* border */
4147 
4148 	if (view->gline)
4149 		return log_goto_line(view, eos);
4150 
4151 	switch (ch) {
4152 	case '&':
4153 		err = limit_log_view(view);
4154 		break;
4155 	case 'q':
4156 		s->quit = 1;
4157 		break;
4158 	case '0':
4159 	case '$':
4160 	case KEY_RIGHT:
4161 	case 'l':
4162 	case KEY_LEFT:
4163 	case 'h':
4164 		horizontal_scroll_input(view, ch);
4165 		break;
4166 	case 'k':
4167 	case KEY_UP:
4168 	case '<':
4169 	case ',':
4170 	case CTRL('p'):
4171 		log_move_cursor_up(view, 0, 0);
4172 		break;
4173 	case 'g':
4174 	case '=':
4175 	case KEY_HOME:
4176 		log_move_cursor_up(view, 0, 1);
4177 		view->count = 0;
4178 		break;
4179 	case CTRL('u'):
4180 	case 'u':
4181 		nscroll /= 2;
4182 		/* FALL THROUGH */
4183 	case KEY_PPAGE:
4184 	case CTRL('b'):
4185 	case 'b':
4186 		log_move_cursor_up(view, nscroll, 0);
4187 		break;
4188 	case 'j':
4189 	case KEY_DOWN:
4190 	case '>':
4191 	case '.':
4192 	case CTRL('n'):
4193 		err = log_move_cursor_down(view, 0);
4194 		break;
4195 	case '@':
4196 		s->use_committer = !s->use_committer;
4197 		view->action = s->use_committer ?
4198 		    "show committer" : "show commit author";
4199 		break;
4200 	case 'G':
4201 	case '*':
4202 	case KEY_END: {
4203 		/* We don't know yet how many commits, so we're forced to
4204 		 * traverse them all. */
4205 		view->count = 0;
4206 		s->thread_args.load_all = 1;
4207 		if (!s->thread_args.log_complete)
4208 			return trigger_log_thread(view, 0);
4209 		err = log_move_cursor_down(view, s->commits->ncommits);
4210 		s->thread_args.load_all = 0;
4211 		break;
4212 	}
4213 	case CTRL('d'):
4214 	case 'd':
4215 		nscroll /= 2;
4216 		/* FALL THROUGH */
4217 	case KEY_NPAGE:
4218 	case CTRL('f'):
4219 	case 'f':
4220 	case ' ':
4221 		err = log_move_cursor_down(view, nscroll);
4222 		break;
4223 	case KEY_RESIZE:
4224 		if (s->selected > view->nlines - 2)
4225 			s->selected = view->nlines - 2;
4226 		if (s->selected > s->commits->ncommits - 1)
4227 			s->selected = s->commits->ncommits - 1;
4228 		select_commit(s);
4229 		if (s->commits->ncommits < view->nlines - 1 &&
4230 		    !s->thread_args.log_complete) {
4231 			s->thread_args.commits_needed += (view->nlines - 1) -
4232 			    s->commits->ncommits;
4233 			err = trigger_log_thread(view, 1);
4234 		}
4235 		break;
4236 	case KEY_ENTER:
4237 	case '\r':
4238 		view->count = 0;
4239 		if (s->selected_entry == NULL)
4240 			break;
4241 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4242 		break;
4243 	case 'T':
4244 		view->count = 0;
4245 		if (s->selected_entry == NULL)
4246 			break;
4247 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4248 		break;
4249 	case KEY_BACKSPACE:
4250 	case CTRL('l'):
4251 	case 'B':
4252 		view->count = 0;
4253 		if (ch == KEY_BACKSPACE &&
4254 		    got_path_is_root_dir(s->in_repo_path))
4255 			break;
4256 		err = stop_log_thread(s);
4257 		if (err)
4258 			return err;
4259 		if (ch == KEY_BACKSPACE) {
4260 			char *parent_path;
4261 			err = got_path_dirname(&parent_path, s->in_repo_path);
4262 			if (err)
4263 				return err;
4264 			free(s->in_repo_path);
4265 			s->in_repo_path = parent_path;
4266 			s->thread_args.in_repo_path = s->in_repo_path;
4267 		} else if (ch == CTRL('l')) {
4268 			struct got_object_id *start_id;
4269 			err = got_repo_match_object_id(&start_id, NULL,
4270 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4271 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4272 			if (err) {
4273 				if (s->head_ref_name == NULL ||
4274 				    err->code != GOT_ERR_NOT_REF)
4275 					return err;
4276 				/* Try to cope with deleted references. */
4277 				free(s->head_ref_name);
4278 				s->head_ref_name = NULL;
4279 				err = got_repo_match_object_id(&start_id,
4280 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4281 				    &tog_refs, s->repo);
4282 				if (err)
4283 					return err;
4284 			}
4285 			free(s->start_id);
4286 			s->start_id = start_id;
4287 			s->thread_args.start_id = s->start_id;
4288 		} else /* 'B' */
4289 			s->log_branches = !s->log_branches;
4290 
4291 		if (s->thread_args.pack_fds == NULL) {
4292 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4293 			if (err)
4294 				return err;
4295 		}
4296 		err = got_repo_open(&s->thread_args.repo,
4297 		    got_repo_get_path(s->repo), NULL,
4298 		    s->thread_args.pack_fds);
4299 		if (err)
4300 			return err;
4301 		tog_free_refs();
4302 		err = tog_load_refs(s->repo, 0);
4303 		if (err)
4304 			return err;
4305 		err = got_commit_graph_open(&s->thread_args.graph,
4306 		    s->in_repo_path, !s->log_branches);
4307 		if (err)
4308 			return err;
4309 		err = got_commit_graph_iter_start(s->thread_args.graph,
4310 		    s->start_id, s->repo, NULL, NULL);
4311 		if (err)
4312 			return err;
4313 		free_commits(&s->real_commits);
4314 		free_commits(&s->limit_commits);
4315 		s->first_displayed_entry = NULL;
4316 		s->last_displayed_entry = NULL;
4317 		s->selected_entry = NULL;
4318 		s->selected = 0;
4319 		s->thread_args.log_complete = 0;
4320 		s->quit = 0;
4321 		s->thread_args.commits_needed = view->lines;
4322 		s->matched_entry = NULL;
4323 		s->search_entry = NULL;
4324 		view->offset = 0;
4325 		break;
4326 	case 'R':
4327 		view->count = 0;
4328 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4329 		break;
4330 	default:
4331 		view->count = 0;
4332 		break;
4333 	}
4334 
4335 	return err;
4336 }
4337 
4338 static const struct got_error *
4339 apply_unveil(const char *repo_path, const char *worktree_path)
4340 {
4341 	const struct got_error *error;
4342 
4343 #ifdef PROFILE
4344 	if (unveil("gmon.out", "rwc") != 0)
4345 		return got_error_from_errno2("unveil", "gmon.out");
4346 #endif
4347 	if (repo_path && unveil(repo_path, "r") != 0)
4348 		return got_error_from_errno2("unveil", repo_path);
4349 
4350 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4351 		return got_error_from_errno2("unveil", worktree_path);
4352 
4353 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4354 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4355 
4356 	error = got_privsep_unveil_exec_helpers();
4357 	if (error != NULL)
4358 		return error;
4359 
4360 	if (unveil(NULL, NULL) != 0)
4361 		return got_error_from_errno("unveil");
4362 
4363 	return NULL;
4364 }
4365 
4366 static const struct got_error *
4367 init_mock_term(const char *test_script_path)
4368 {
4369 	const struct got_error	*err = NULL;
4370 	const char *screen_dump_path;
4371 	int in;
4372 
4373 	if (test_script_path == NULL || *test_script_path == '\0')
4374 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4375 
4376 	tog_io.f = fopen(test_script_path, "re");
4377 	if (tog_io.f == NULL) {
4378 		err = got_error_from_errno_fmt("fopen: %s",
4379 		    test_script_path);
4380 		goto done;
4381 	}
4382 
4383 	/* test mode, we don't want any output */
4384 	tog_io.cout = fopen("/dev/null", "w+");
4385 	if (tog_io.cout == NULL) {
4386 		err = got_error_from_errno2("fopen", "/dev/null");
4387 		goto done;
4388 	}
4389 
4390 	in = dup(fileno(tog_io.cout));
4391 	if (in == -1) {
4392 		err = got_error_from_errno("dup");
4393 		goto done;
4394 	}
4395 	tog_io.cin = fdopen(in, "r");
4396 	if (tog_io.cin == NULL) {
4397 		err = got_error_from_errno("fdopen");
4398 		close(in);
4399 		goto done;
4400 	}
4401 
4402 	screen_dump_path = getenv("TOG_SCR_DUMP");
4403 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4404 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4405 	tog_io.sdump = fopen(screen_dump_path, "we");
4406 	if (tog_io.sdump == NULL) {
4407 		err = got_error_from_errno2("fopen", screen_dump_path);
4408 		goto done;
4409 	}
4410 
4411 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4412 		err = got_error_from_errno("fseeko");
4413 		goto done;
4414 	}
4415 
4416 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4417 		err = got_error_msg(GOT_ERR_IO,
4418 		    "newterm: failed to initialise curses");
4419 
4420 	using_mock_io = 1;
4421 
4422 done:
4423 	if (err)
4424 		tog_io_close();
4425 	return err;
4426 }
4427 
4428 static void
4429 init_curses(void)
4430 {
4431 	if (using_mock_io) /* In test mode we use a fake terminal */
4432 		return;
4433 
4434 	initscr();
4435 
4436 	cbreak();
4437 	halfdelay(1); /* Fast refresh while initial view is loading. */
4438 	noecho();
4439 	nonl();
4440 	intrflush(stdscr, FALSE);
4441 	keypad(stdscr, TRUE);
4442 	curs_set(0);
4443 	if (getenv("TOG_COLORS") != NULL) {
4444 		start_color();
4445 		use_default_colors();
4446 	}
4447 
4448 	return;
4449 }
4450 
4451 static const struct got_error *
4452 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4453 {
4454 	tog_base_commit.id = got_object_id_dup(
4455 	    got_worktree_get_base_commit_id(worktree));
4456 	if (tog_base_commit.id == NULL)
4457 		return got_error_from_errno( "got_object_id_dup");
4458 
4459 	return NULL;
4460 }
4461 
4462 static const struct got_error *
4463 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4464     struct got_repository *repo, struct got_worktree *worktree)
4465 {
4466 	const struct got_error *err = NULL;
4467 
4468 	if (argc == 0) {
4469 		*in_repo_path = strdup("/");
4470 		if (*in_repo_path == NULL)
4471 			return got_error_from_errno("strdup");
4472 		return NULL;
4473 	}
4474 
4475 	if (worktree) {
4476 		const char *prefix = got_worktree_get_path_prefix(worktree);
4477 		char *p;
4478 
4479 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4480 		if (err)
4481 			return err;
4482 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4483 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4484 		    p) == -1) {
4485 			err = got_error_from_errno("asprintf");
4486 			*in_repo_path = NULL;
4487 		}
4488 		free(p);
4489 	} else
4490 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4491 
4492 	return err;
4493 }
4494 
4495 static const struct got_error *
4496 cmd_log(int argc, char *argv[])
4497 {
4498 	const struct got_error *error;
4499 	struct got_repository *repo = NULL;
4500 	struct got_worktree *worktree = NULL;
4501 	struct got_object_id *start_id = NULL;
4502 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4503 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4504 	struct got_reference *ref = NULL;
4505 	const char *head_ref_name = NULL;
4506 	int ch, log_branches = 0;
4507 	struct tog_view *view;
4508 	int *pack_fds = NULL;
4509 
4510 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4511 		switch (ch) {
4512 		case 'b':
4513 			log_branches = 1;
4514 			break;
4515 		case 'c':
4516 			start_commit = optarg;
4517 			break;
4518 		case 'r':
4519 			repo_path = realpath(optarg, NULL);
4520 			if (repo_path == NULL)
4521 				return got_error_from_errno2("realpath",
4522 				    optarg);
4523 			break;
4524 		default:
4525 			usage_log();
4526 			/* NOTREACHED */
4527 		}
4528 	}
4529 
4530 	argc -= optind;
4531 	argv += optind;
4532 
4533 	if (argc > 1)
4534 		usage_log();
4535 
4536 	error = got_repo_pack_fds_open(&pack_fds);
4537 	if (error != NULL)
4538 		goto done;
4539 
4540 	if (repo_path == NULL) {
4541 		cwd = getcwd(NULL, 0);
4542 		if (cwd == NULL) {
4543 			error = got_error_from_errno("getcwd");
4544 			goto done;
4545 		}
4546 		error = got_worktree_open(&worktree, cwd, NULL);
4547 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4548 			goto done;
4549 		if (worktree)
4550 			repo_path =
4551 			    strdup(got_worktree_get_repo_path(worktree));
4552 		else
4553 			repo_path = strdup(cwd);
4554 		if (repo_path == NULL) {
4555 			error = got_error_from_errno("strdup");
4556 			goto done;
4557 		}
4558 	}
4559 
4560 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4561 	if (error != NULL)
4562 		goto done;
4563 
4564 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4565 	    repo, worktree);
4566 	if (error)
4567 		goto done;
4568 
4569 	init_curses();
4570 
4571 	error = apply_unveil(got_repo_get_path(repo),
4572 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4573 	if (error)
4574 		goto done;
4575 
4576 	/* already loaded by tog_log_with_path()? */
4577 	if (TAILQ_EMPTY(&tog_refs)) {
4578 		error = tog_load_refs(repo, 0);
4579 		if (error)
4580 			goto done;
4581 	}
4582 
4583 	if (start_commit == NULL) {
4584 		error = got_repo_match_object_id(&start_id, &label,
4585 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4586 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4587 		if (error)
4588 			goto done;
4589 		head_ref_name = label;
4590 	} else {
4591 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4592 		    repo, worktree);
4593 		if (error != NULL)
4594 			goto done;
4595 		if (keyword_idstr != NULL)
4596 			start_commit = keyword_idstr;
4597 
4598 		error = got_ref_open(&ref, repo, start_commit, 0);
4599 		if (error == NULL)
4600 			head_ref_name = got_ref_get_name(ref);
4601 		else if (error->code != GOT_ERR_NOT_REF)
4602 			goto done;
4603 		error = got_repo_match_object_id(&start_id, NULL,
4604 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4605 		if (error)
4606 			goto done;
4607 	}
4608 
4609 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4610 	if (view == NULL) {
4611 		error = got_error_from_errno("view_open");
4612 		goto done;
4613 	}
4614 
4615 	if (worktree) {
4616 		error = set_tog_base_commit(repo, worktree);
4617 		if (error != NULL)
4618 			goto done;
4619 	}
4620 
4621 	error = open_log_view(view, start_id, repo, head_ref_name,
4622 	    in_repo_path, log_branches, worktree);
4623 	if (error)
4624 		goto done;
4625 
4626 	if (worktree) {
4627 		/* The work tree will be closed by the log thread. */
4628 		worktree = NULL;
4629 	}
4630 
4631 	error = view_loop(view);
4632 
4633 done:
4634 	free(tog_base_commit.id);
4635 	free(keyword_idstr);
4636 	free(in_repo_path);
4637 	free(repo_path);
4638 	free(cwd);
4639 	free(start_id);
4640 	free(label);
4641 	if (ref)
4642 		got_ref_close(ref);
4643 	if (repo) {
4644 		const struct got_error *close_err = got_repo_close(repo);
4645 		if (error == NULL)
4646 			error = close_err;
4647 	}
4648 	if (worktree)
4649 		got_worktree_close(worktree);
4650 	if (pack_fds) {
4651 		const struct got_error *pack_err =
4652 		    got_repo_pack_fds_close(pack_fds);
4653 		if (error == NULL)
4654 			error = pack_err;
4655 	}
4656 	tog_free_refs();
4657 	return error;
4658 }
4659 
4660 __dead static void
4661 usage_diff(void)
4662 {
4663 	endwin();
4664 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4665 	    "object1 object2\n", getprogname());
4666 	exit(1);
4667 }
4668 
4669 static int
4670 match_line(const char *line, regex_t *regex, size_t nmatch,
4671     regmatch_t *regmatch)
4672 {
4673 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4674 }
4675 
4676 static struct tog_color *
4677 match_color(struct tog_colors *colors, const char *line)
4678 {
4679 	struct tog_color *tc = NULL;
4680 
4681 	STAILQ_FOREACH(tc, colors, entry) {
4682 		if (match_line(line, &tc->regex, 0, NULL))
4683 			return tc;
4684 	}
4685 
4686 	return NULL;
4687 }
4688 
4689 static const struct got_error *
4690 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4691     WINDOW *window, int skipcol, regmatch_t *regmatch)
4692 {
4693 	const struct got_error *err = NULL;
4694 	char *exstr = NULL;
4695 	wchar_t *wline = NULL;
4696 	int rme, rms, n, width, scrollx;
4697 	int width0 = 0, width1 = 0, width2 = 0;
4698 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4699 
4700 	*wtotal = 0;
4701 
4702 	rms = regmatch->rm_so;
4703 	rme = regmatch->rm_eo;
4704 
4705 	err = expand_tab(&exstr, line);
4706 	if (err)
4707 		return err;
4708 
4709 	/* Split the line into 3 segments, according to match offsets. */
4710 	seg0 = strndup(exstr, rms);
4711 	if (seg0 == NULL) {
4712 		err = got_error_from_errno("strndup");
4713 		goto done;
4714 	}
4715 	seg1 = strndup(exstr + rms, rme - rms);
4716 	if (seg1 == NULL) {
4717 		err = got_error_from_errno("strndup");
4718 		goto done;
4719 	}
4720 	seg2 = strdup(exstr + rme);
4721 	if (seg2 == NULL) {
4722 		err = got_error_from_errno("strndup");
4723 		goto done;
4724 	}
4725 
4726 	/* draw up to matched token if we haven't scrolled past it */
4727 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4728 	    col_tab_align, 1);
4729 	if (err)
4730 		goto done;
4731 	n = MAX(width0 - skipcol, 0);
4732 	if (n) {
4733 		free(wline);
4734 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4735 		    wlimit, col_tab_align, 1);
4736 		if (err)
4737 			goto done;
4738 		waddwstr(window, &wline[scrollx]);
4739 		wlimit -= width;
4740 		*wtotal += width;
4741 	}
4742 
4743 	if (wlimit > 0) {
4744 		int i = 0, w = 0;
4745 		size_t wlen;
4746 
4747 		free(wline);
4748 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4749 		    col_tab_align, 1);
4750 		if (err)
4751 			goto done;
4752 		wlen = wcslen(wline);
4753 		while (i < wlen) {
4754 			width = wcwidth(wline[i]);
4755 			if (width == -1) {
4756 				/* should not happen, tabs are expanded */
4757 				err = got_error(GOT_ERR_RANGE);
4758 				goto done;
4759 			}
4760 			if (width0 + w + width > skipcol)
4761 				break;
4762 			w += width;
4763 			i++;
4764 		}
4765 		/* draw (visible part of) matched token (if scrolled into it) */
4766 		if (width1 - w > 0) {
4767 			wattron(window, A_STANDOUT);
4768 			waddwstr(window, &wline[i]);
4769 			wattroff(window, A_STANDOUT);
4770 			wlimit -= (width1 - w);
4771 			*wtotal += (width1 - w);
4772 		}
4773 	}
4774 
4775 	if (wlimit > 0) {  /* draw rest of line */
4776 		free(wline);
4777 		if (skipcol > width0 + width1) {
4778 			err = format_line(&wline, &width2, &scrollx, seg2,
4779 			    skipcol - (width0 + width1), wlimit,
4780 			    col_tab_align, 1);
4781 			if (err)
4782 				goto done;
4783 			waddwstr(window, &wline[scrollx]);
4784 		} else {
4785 			err = format_line(&wline, &width2, NULL, seg2, 0,
4786 			    wlimit, col_tab_align, 1);
4787 			if (err)
4788 				goto done;
4789 			waddwstr(window, wline);
4790 		}
4791 		*wtotal += width2;
4792 	}
4793 done:
4794 	free(wline);
4795 	free(exstr);
4796 	free(seg0);
4797 	free(seg1);
4798 	free(seg2);
4799 	return err;
4800 }
4801 
4802 static int
4803 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4804 {
4805 	FILE	*f = NULL;
4806 	int	*eof, *first, *selected;
4807 
4808 	if (view->type == TOG_VIEW_DIFF) {
4809 		struct tog_diff_view_state *s = &view->state.diff;
4810 
4811 		first = &s->first_displayed_line;
4812 		selected = first;
4813 		eof = &s->eof;
4814 		f = s->f;
4815 	} else if (view->type == TOG_VIEW_HELP) {
4816 		struct tog_help_view_state *s = &view->state.help;
4817 
4818 		first = &s->first_displayed_line;
4819 		selected = first;
4820 		eof = &s->eof;
4821 		f = s->f;
4822 	} else if (view->type == TOG_VIEW_BLAME) {
4823 		struct tog_blame_view_state *s = &view->state.blame;
4824 
4825 		first = &s->first_displayed_line;
4826 		selected = &s->selected_line;
4827 		eof = &s->eof;
4828 		f = s->blame.f;
4829 	} else
4830 		return 0;
4831 
4832 	/* Center gline in the middle of the page like vi(1). */
4833 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4834 		return 0;
4835 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4836 		rewind(f);
4837 		*eof = 0;
4838 		*first = 1;
4839 		*lineno = 0;
4840 		*nprinted = 0;
4841 		return 0;
4842 	}
4843 
4844 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4845 		view->gline : (view->nlines - 3) / 2 + 1;
4846 	view->gline = 0;
4847 
4848 	return 1;
4849 }
4850 
4851 static const struct got_error *
4852 draw_file(struct tog_view *view, const char *header)
4853 {
4854 	struct tog_diff_view_state *s = &view->state.diff;
4855 	regmatch_t *regmatch = &view->regmatch;
4856 	const struct got_error *err;
4857 	int nprinted = 0;
4858 	char *line;
4859 	size_t linesize = 0;
4860 	ssize_t linelen;
4861 	wchar_t *wline;
4862 	int width;
4863 	int max_lines = view->nlines;
4864 	int nlines = s->nlines;
4865 	off_t line_offset;
4866 
4867 	s->lineno = s->first_displayed_line - 1;
4868 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4869 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4870 		return got_error_from_errno("fseek");
4871 
4872 	werase(view->window);
4873 
4874 	if (view->gline > s->nlines - 1)
4875 		view->gline = s->nlines - 1;
4876 
4877 	if (header) {
4878 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4879 		    1 : view->gline - (view->nlines - 3) / 2 :
4880 		    s->lineno + s->selected_line;
4881 
4882 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4883 			return got_error_from_errno("asprintf");
4884 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4885 		    0, 0);
4886 		free(line);
4887 		if (err)
4888 			return err;
4889 
4890 		if (view_needs_focus_indication(view))
4891 			wstandout(view->window);
4892 		waddwstr(view->window, wline);
4893 		free(wline);
4894 		wline = NULL;
4895 		while (width++ < view->ncols)
4896 			waddch(view->window, ' ');
4897 		if (view_needs_focus_indication(view))
4898 			wstandend(view->window);
4899 
4900 		if (max_lines <= 1)
4901 			return NULL;
4902 		max_lines--;
4903 	}
4904 
4905 	s->eof = 0;
4906 	view->maxx = 0;
4907 	line = NULL;
4908 	while (max_lines > 0 && nprinted < max_lines) {
4909 		enum got_diff_line_type linetype;
4910 		attr_t attr = 0;
4911 
4912 		linelen = getline(&line, &linesize, s->f);
4913 		if (linelen == -1) {
4914 			if (feof(s->f)) {
4915 				s->eof = 1;
4916 				break;
4917 			}
4918 			free(line);
4919 			return got_ferror(s->f, GOT_ERR_IO);
4920 		}
4921 
4922 		if (++s->lineno < s->first_displayed_line)
4923 			continue;
4924 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4925 			continue;
4926 		if (s->lineno == view->hiline)
4927 			attr = A_STANDOUT;
4928 
4929 		/* Set view->maxx based on full line length. */
4930 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4931 		    view->x ? 1 : 0);
4932 		if (err) {
4933 			free(line);
4934 			return err;
4935 		}
4936 		view->maxx = MAX(view->maxx, width);
4937 		free(wline);
4938 		wline = NULL;
4939 
4940 		linetype = s->lines[s->lineno].type;
4941 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4942 		    linetype < GOT_DIFF_LINE_CONTEXT)
4943 			attr |= COLOR_PAIR(linetype);
4944 		if (attr)
4945 			wattron(view->window, attr);
4946 		if (s->first_displayed_line + nprinted == s->matched_line &&
4947 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4948 			err = add_matched_line(&width, line, view->ncols, 0,
4949 			    view->window, view->x, regmatch);
4950 			if (err) {
4951 				free(line);
4952 				return err;
4953 			}
4954 		} else {
4955 			int skip;
4956 			err = format_line(&wline, &width, &skip, line,
4957 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4958 			if (err) {
4959 				free(line);
4960 				return err;
4961 			}
4962 			waddwstr(view->window, &wline[skip]);
4963 			free(wline);
4964 			wline = NULL;
4965 		}
4966 		if (s->lineno == view->hiline) {
4967 			/* highlight full gline length */
4968 			while (width++ < view->ncols)
4969 				waddch(view->window, ' ');
4970 		} else {
4971 			if (width <= view->ncols - 1)
4972 				waddch(view->window, '\n');
4973 		}
4974 		if (attr)
4975 			wattroff(view->window, attr);
4976 		if (++nprinted == 1)
4977 			s->first_displayed_line = s->lineno;
4978 	}
4979 	free(line);
4980 	if (nprinted >= 1)
4981 		s->last_displayed_line = s->first_displayed_line +
4982 		    (nprinted - 1);
4983 	else
4984 		s->last_displayed_line = s->first_displayed_line;
4985 
4986 	view_border(view);
4987 
4988 	if (s->eof) {
4989 		while (nprinted < view->nlines) {
4990 			waddch(view->window, '\n');
4991 			nprinted++;
4992 		}
4993 
4994 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4995 		    view->ncols, 0, 0);
4996 		if (err) {
4997 			return err;
4998 		}
4999 
5000 		wstandout(view->window);
5001 		waddwstr(view->window, wline);
5002 		free(wline);
5003 		wline = NULL;
5004 		wstandend(view->window);
5005 	}
5006 
5007 	return NULL;
5008 }
5009 
5010 static char *
5011 get_datestr(time_t *time, char *datebuf)
5012 {
5013 	struct tm mytm, *tm;
5014 	char *p, *s;
5015 
5016 	tm = gmtime_r(time, &mytm);
5017 	if (tm == NULL)
5018 		return NULL;
5019 	s = asctime_r(tm, datebuf);
5020 	if (s == NULL)
5021 		return NULL;
5022 	p = strchr(s, '\n');
5023 	if (p)
5024 		*p = '\0';
5025 	return s;
5026 }
5027 
5028 static const struct got_error *
5029 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5030     off_t off, uint8_t type)
5031 {
5032 	struct got_diff_line *p;
5033 
5034 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5035 	if (p == NULL)
5036 		return got_error_from_errno("reallocarray");
5037 	*lines = p;
5038 	(*lines)[*nlines].offset = off;
5039 	(*lines)[*nlines].type = type;
5040 	(*nlines)++;
5041 
5042 	return NULL;
5043 }
5044 
5045 static const struct got_error *
5046 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5047     struct got_diff_line *s_lines, size_t s_nlines)
5048 {
5049 	struct got_diff_line	*p;
5050 	char			 buf[BUFSIZ];
5051 	size_t			 i, r;
5052 
5053 	if (fseeko(src, 0L, SEEK_SET) == -1)
5054 		return got_error_from_errno("fseeko");
5055 
5056 	for (;;) {
5057 		r = fread(buf, 1, sizeof(buf), src);
5058 		if (r == 0) {
5059 			if (ferror(src))
5060 				return got_error_from_errno("fread");
5061 			if (feof(src))
5062 				break;
5063 		}
5064 		if (fwrite(buf, 1, r, dst) != r)
5065 			return got_ferror(dst, GOT_ERR_IO);
5066 	}
5067 
5068 	if (s_nlines == 0 && *d_nlines == 0)
5069 		return NULL;
5070 
5071 	/*
5072 	 * If commit info was in dst, increment line offsets
5073 	 * of the appended diff content, but skip s_lines[0]
5074 	 * because offset zero is already in *d_lines.
5075 	 */
5076 	if (*d_nlines > 0) {
5077 		for (i = 1; i < s_nlines; ++i)
5078 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5079 
5080 		if (s_nlines > 0) {
5081 			--s_nlines;
5082 			++s_lines;
5083 		}
5084 	}
5085 
5086 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5087 	if (p == NULL) {
5088 		/* d_lines is freed in close_diff_view() */
5089 		return got_error_from_errno("reallocarray");
5090 	}
5091 
5092 	*d_lines = p;
5093 
5094 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5095 	*d_nlines += s_nlines;
5096 
5097 	return NULL;
5098 }
5099 
5100 static const struct got_error *
5101 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5102     struct got_object_id *commit_id, struct got_reflist_head *refs,
5103     struct got_repository *repo, int ignore_ws, int force_text_diff,
5104     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5105 {
5106 	const struct got_error *err = NULL;
5107 	char datebuf[26], *datestr;
5108 	struct got_commit_object *commit;
5109 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5110 	time_t committer_time;
5111 	const char *author, *committer;
5112 	char *refs_str = NULL;
5113 	struct got_pathlist_entry *pe;
5114 	off_t outoff = 0;
5115 	int n;
5116 
5117 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5118 	if (err)
5119 		return err;
5120 
5121 	err = got_object_open_as_commit(&commit, repo, commit_id);
5122 	if (err)
5123 		return err;
5124 
5125 	err = got_object_id_str(&id_str, commit_id);
5126 	if (err) {
5127 		err = got_error_from_errno("got_object_id_str");
5128 		goto done;
5129 	}
5130 
5131 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5132 	if (err)
5133 		goto done;
5134 
5135 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5136 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5137 	if (n < 0) {
5138 		err = got_error_from_errno("fprintf");
5139 		goto done;
5140 	}
5141 	outoff += n;
5142 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5143 	if (err)
5144 		goto done;
5145 
5146 	n = fprintf(outfile, "from: %s\n",
5147 	    got_object_commit_get_author(commit));
5148 	if (n < 0) {
5149 		err = got_error_from_errno("fprintf");
5150 		goto done;
5151 	}
5152 	outoff += n;
5153 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5154 	if (err)
5155 		goto done;
5156 
5157 	author = got_object_commit_get_author(commit);
5158 	committer = got_object_commit_get_committer(commit);
5159 	if (strcmp(author, committer) != 0) {
5160 		n = fprintf(outfile, "via: %s\n", committer);
5161 		if (n < 0) {
5162 			err = got_error_from_errno("fprintf");
5163 			goto done;
5164 		}
5165 		outoff += n;
5166 		err = add_line_metadata(lines, nlines, outoff,
5167 		    GOT_DIFF_LINE_AUTHOR);
5168 		if (err)
5169 			goto done;
5170 	}
5171 	committer_time = got_object_commit_get_committer_time(commit);
5172 	datestr = get_datestr(&committer_time, datebuf);
5173 	if (datestr) {
5174 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5175 		if (n < 0) {
5176 			err = got_error_from_errno("fprintf");
5177 			goto done;
5178 		}
5179 		outoff += n;
5180 		err = add_line_metadata(lines, nlines, outoff,
5181 		    GOT_DIFF_LINE_DATE);
5182 		if (err)
5183 			goto done;
5184 	}
5185 	if (got_object_commit_get_nparents(commit) > 1) {
5186 		const struct got_object_id_queue *parent_ids;
5187 		struct got_object_qid *qid;
5188 		int pn = 1;
5189 		parent_ids = got_object_commit_get_parent_ids(commit);
5190 		STAILQ_FOREACH(qid, parent_ids, entry) {
5191 			err = got_object_id_str(&id_str, &qid->id);
5192 			if (err)
5193 				goto done;
5194 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5195 			if (n < 0) {
5196 				err = got_error_from_errno("fprintf");
5197 				goto done;
5198 			}
5199 			outoff += n;
5200 			err = add_line_metadata(lines, nlines, outoff,
5201 			    GOT_DIFF_LINE_META);
5202 			if (err)
5203 				goto done;
5204 			free(id_str);
5205 			id_str = NULL;
5206 		}
5207 	}
5208 
5209 	err = got_object_commit_get_logmsg(&logmsg, commit);
5210 	if (err)
5211 		goto done;
5212 	s = logmsg;
5213 	while ((line = strsep(&s, "\n")) != NULL) {
5214 		n = fprintf(outfile, "%s\n", line);
5215 		if (n < 0) {
5216 			err = got_error_from_errno("fprintf");
5217 			goto done;
5218 		}
5219 		outoff += n;
5220 		err = add_line_metadata(lines, nlines, outoff,
5221 		    GOT_DIFF_LINE_LOGMSG);
5222 		if (err)
5223 			goto done;
5224 	}
5225 
5226 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5227 		struct got_diff_changed_path *cp = pe->data;
5228 		int pad = dsa->max_path_len - pe->path_len + 1;
5229 
5230 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5231 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5232 		    dsa->rm_cols + 1, cp->rm);
5233 		if (n < 0) {
5234 			err = got_error_from_errno("fprintf");
5235 			goto done;
5236 		}
5237 		outoff += n;
5238 		err = add_line_metadata(lines, nlines, outoff,
5239 		    GOT_DIFF_LINE_CHANGES);
5240 		if (err)
5241 			goto done;
5242 	}
5243 
5244 	fputc('\n', outfile);
5245 	outoff++;
5246 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5247 	if (err)
5248 		goto done;
5249 
5250 	n = fprintf(outfile,
5251 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5252 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5253 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5254 	if (n < 0) {
5255 		err = got_error_from_errno("fprintf");
5256 		goto done;
5257 	}
5258 	outoff += n;
5259 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5260 	if (err)
5261 		goto done;
5262 
5263 	fputc('\n', outfile);
5264 	outoff++;
5265 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5266 done:
5267 	free(id_str);
5268 	free(logmsg);
5269 	free(refs_str);
5270 	got_object_commit_close(commit);
5271 	if (err) {
5272 		free(*lines);
5273 		*lines = NULL;
5274 		*nlines = 0;
5275 	}
5276 	return err;
5277 }
5278 
5279 static const struct got_error *
5280 create_diff(struct tog_diff_view_state *s)
5281 {
5282 	const struct got_error *err = NULL;
5283 	FILE *f = NULL, *tmp_diff_file = NULL;
5284 	int obj_type;
5285 	struct got_diff_line *lines = NULL;
5286 	struct got_pathlist_head changed_paths;
5287 
5288 	TAILQ_INIT(&changed_paths);
5289 
5290 	free(s->lines);
5291 	s->lines = malloc(sizeof(*s->lines));
5292 	if (s->lines == NULL)
5293 		return got_error_from_errno("malloc");
5294 	s->nlines = 0;
5295 
5296 	f = got_opentemp();
5297 	if (f == NULL) {
5298 		err = got_error_from_errno("got_opentemp");
5299 		goto done;
5300 	}
5301 	tmp_diff_file = got_opentemp();
5302 	if (tmp_diff_file == NULL) {
5303 		err = got_error_from_errno("got_opentemp");
5304 		goto done;
5305 	}
5306 	if (s->f && fclose(s->f) == EOF) {
5307 		err = got_error_from_errno("fclose");
5308 		goto done;
5309 	}
5310 	s->f = f;
5311 
5312 	if (s->id1)
5313 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5314 	else
5315 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5316 	if (err)
5317 		goto done;
5318 
5319 	switch (obj_type) {
5320 	case GOT_OBJ_TYPE_BLOB:
5321 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5322 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5323 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5324 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5325 		    s->f);
5326 		break;
5327 	case GOT_OBJ_TYPE_TREE:
5328 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5329 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5330 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5331 		    s->force_text_diff, NULL, s->repo, s->f);
5332 		break;
5333 	case GOT_OBJ_TYPE_COMMIT: {
5334 		const struct got_object_id_queue *parent_ids;
5335 		struct got_object_qid *pid;
5336 		struct got_commit_object *commit2;
5337 		struct got_reflist_head *refs;
5338 		size_t nlines = 0;
5339 		struct got_diffstat_cb_arg dsa = {
5340 			0, 0, 0, 0, 0, 0,
5341 			&changed_paths,
5342 			s->ignore_whitespace,
5343 			s->force_text_diff,
5344 			tog_diff_algo
5345 		};
5346 
5347 		lines = malloc(sizeof(*lines));
5348 		if (lines == NULL) {
5349 			err = got_error_from_errno("malloc");
5350 			goto done;
5351 		}
5352 
5353 		/* build diff first in tmp file then append to commit info */
5354 		err = got_diff_objects_as_commits(&lines, &nlines,
5355 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5356 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5357 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5358 		if (err)
5359 			break;
5360 
5361 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5362 		if (err)
5363 			goto done;
5364 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5365 		/* Show commit info if we're diffing to a parent/root commit. */
5366 		if (s->id1 == NULL) {
5367 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5368 			    refs, s->repo, s->ignore_whitespace,
5369 			    s->force_text_diff, &dsa, s->f);
5370 			if (err)
5371 				goto done;
5372 		} else {
5373 			parent_ids = got_object_commit_get_parent_ids(commit2);
5374 			STAILQ_FOREACH(pid, parent_ids, entry) {
5375 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5376 					err = write_commit_info(&s->lines,
5377 					    &s->nlines, s->id2, refs, s->repo,
5378 					    s->ignore_whitespace,
5379 					    s->force_text_diff, &dsa, s->f);
5380 					if (err)
5381 						goto done;
5382 					break;
5383 				}
5384 			}
5385 		}
5386 		got_object_commit_close(commit2);
5387 
5388 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5389 		    lines, nlines);
5390 		break;
5391 	}
5392 	default:
5393 		err = got_error(GOT_ERR_OBJ_TYPE);
5394 		break;
5395 	}
5396 done:
5397 	free(lines);
5398 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5399 	if (s->f && fflush(s->f) != 0 && err == NULL)
5400 		err = got_error_from_errno("fflush");
5401 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5402 		err = got_error_from_errno("fclose");
5403 	return err;
5404 }
5405 
5406 static void
5407 diff_view_indicate_progress(struct tog_view *view)
5408 {
5409 	mvwaddstr(view->window, 0, 0, "diffing...");
5410 	update_panels();
5411 	doupdate();
5412 }
5413 
5414 static const struct got_error *
5415 search_start_diff_view(struct tog_view *view)
5416 {
5417 	struct tog_diff_view_state *s = &view->state.diff;
5418 
5419 	s->matched_line = 0;
5420 	return NULL;
5421 }
5422 
5423 static void
5424 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5425     size_t *nlines, int **first, int **last, int **match, int **selected)
5426 {
5427 	struct tog_diff_view_state *s = &view->state.diff;
5428 
5429 	*f = s->f;
5430 	*nlines = s->nlines;
5431 	*line_offsets = NULL;
5432 	*match = &s->matched_line;
5433 	*first = &s->first_displayed_line;
5434 	*last = &s->last_displayed_line;
5435 	*selected = &s->selected_line;
5436 }
5437 
5438 static const struct got_error *
5439 search_next_view_match(struct tog_view *view)
5440 {
5441 	const struct got_error *err = NULL;
5442 	FILE *f;
5443 	int lineno;
5444 	char *line = NULL;
5445 	size_t linesize = 0;
5446 	ssize_t linelen;
5447 	off_t *line_offsets;
5448 	size_t nlines = 0;
5449 	int *first, *last, *match, *selected;
5450 
5451 	if (!view->search_setup)
5452 		return got_error_msg(GOT_ERR_NOT_IMPL,
5453 		    "view search not supported");
5454 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5455 	    &match, &selected);
5456 
5457 	if (!view->searching) {
5458 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5459 		return NULL;
5460 	}
5461 
5462 	if (*match) {
5463 		if (view->searching == TOG_SEARCH_FORWARD)
5464 			lineno = *first + 1;
5465 		else
5466 			lineno = *first - 1;
5467 	} else
5468 		lineno = *first - 1 + *selected;
5469 
5470 	while (1) {
5471 		off_t offset;
5472 
5473 		if (lineno <= 0 || lineno > nlines) {
5474 			if (*match == 0) {
5475 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5476 				break;
5477 			}
5478 
5479 			if (view->searching == TOG_SEARCH_FORWARD)
5480 				lineno = 1;
5481 			else
5482 				lineno = nlines;
5483 		}
5484 
5485 		offset = view->type == TOG_VIEW_DIFF ?
5486 		    view->state.diff.lines[lineno - 1].offset :
5487 		    line_offsets[lineno - 1];
5488 		if (fseeko(f, offset, SEEK_SET) != 0) {
5489 			free(line);
5490 			return got_error_from_errno("fseeko");
5491 		}
5492 		linelen = getline(&line, &linesize, f);
5493 		if (linelen != -1) {
5494 			char *exstr;
5495 			err = expand_tab(&exstr, line);
5496 			if (err)
5497 				break;
5498 			if (match_line(exstr, &view->regex, 1,
5499 			    &view->regmatch)) {
5500 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5501 				*match = lineno;
5502 				free(exstr);
5503 				break;
5504 			}
5505 			free(exstr);
5506 		}
5507 		if (view->searching == TOG_SEARCH_FORWARD)
5508 			lineno++;
5509 		else
5510 			lineno--;
5511 	}
5512 	free(line);
5513 
5514 	if (*match) {
5515 		*first = *match;
5516 		*selected = 1;
5517 	}
5518 
5519 	return err;
5520 }
5521 
5522 static const struct got_error *
5523 close_diff_view(struct tog_view *view)
5524 {
5525 	const struct got_error *err = NULL;
5526 	struct tog_diff_view_state *s = &view->state.diff;
5527 
5528 	free(s->id1);
5529 	s->id1 = NULL;
5530 	free(s->id2);
5531 	s->id2 = NULL;
5532 	if (s->f && fclose(s->f) == EOF)
5533 		err = got_error_from_errno("fclose");
5534 	s->f = NULL;
5535 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5536 		err = got_error_from_errno("fclose");
5537 	s->f1 = NULL;
5538 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5539 		err = got_error_from_errno("fclose");
5540 	s->f2 = NULL;
5541 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5542 		err = got_error_from_errno("close");
5543 	s->fd1 = -1;
5544 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5545 		err = got_error_from_errno("close");
5546 	s->fd2 = -1;
5547 	free(s->lines);
5548 	s->lines = NULL;
5549 	s->nlines = 0;
5550 	return err;
5551 }
5552 
5553 static const struct got_error *
5554 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5555     struct got_object_id *id2, const char *label1, const char *label2,
5556     int diff_context, int ignore_whitespace, int force_text_diff,
5557     struct tog_view *parent_view, struct got_repository *repo)
5558 {
5559 	const struct got_error *err;
5560 	struct tog_diff_view_state *s = &view->state.diff;
5561 
5562 	memset(s, 0, sizeof(*s));
5563 	s->fd1 = -1;
5564 	s->fd2 = -1;
5565 
5566 	if (id1 != NULL && id2 != NULL) {
5567 		int type1, type2;
5568 
5569 		err = got_object_get_type(&type1, repo, id1);
5570 		if (err)
5571 			goto done;
5572 		err = got_object_get_type(&type2, repo, id2);
5573 		if (err)
5574 			goto done;
5575 
5576 		if (type1 != type2) {
5577 			err = got_error(GOT_ERR_OBJ_TYPE);
5578 			goto done;
5579 		}
5580 	}
5581 	s->first_displayed_line = 1;
5582 	s->last_displayed_line = view->nlines;
5583 	s->selected_line = 1;
5584 	s->repo = repo;
5585 	s->id1 = id1;
5586 	s->id2 = id2;
5587 	s->label1 = label1;
5588 	s->label2 = label2;
5589 
5590 	if (id1) {
5591 		s->id1 = got_object_id_dup(id1);
5592 		if (s->id1 == NULL) {
5593 			err = got_error_from_errno("got_object_id_dup");
5594 			goto done;
5595 		}
5596 	} else
5597 		s->id1 = NULL;
5598 
5599 	s->id2 = got_object_id_dup(id2);
5600 	if (s->id2 == NULL) {
5601 		err = got_error_from_errno("got_object_id_dup");
5602 		goto done;
5603 	}
5604 
5605 	s->f1 = got_opentemp();
5606 	if (s->f1 == NULL) {
5607 		err = got_error_from_errno("got_opentemp");
5608 		goto done;
5609 	}
5610 
5611 	s->f2 = got_opentemp();
5612 	if (s->f2 == NULL) {
5613 		err = got_error_from_errno("got_opentemp");
5614 		goto done;
5615 	}
5616 
5617 	s->fd1 = got_opentempfd();
5618 	if (s->fd1 == -1) {
5619 		err = got_error_from_errno("got_opentempfd");
5620 		goto done;
5621 	}
5622 
5623 	s->fd2 = got_opentempfd();
5624 	if (s->fd2 == -1) {
5625 		err = got_error_from_errno("got_opentempfd");
5626 		goto done;
5627 	}
5628 
5629 	s->diff_context = diff_context;
5630 	s->ignore_whitespace = ignore_whitespace;
5631 	s->force_text_diff = force_text_diff;
5632 	s->parent_view = parent_view;
5633 	s->repo = repo;
5634 
5635 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5636 		int rc;
5637 
5638 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5639 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5640 		if (rc != ERR)
5641 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5642 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5643 		if (rc != ERR)
5644 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5645 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5646 		if (rc != ERR)
5647 			rc = init_pair(GOT_DIFF_LINE_META,
5648 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5649 		if (rc != ERR)
5650 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5651 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5652 		if (rc != ERR)
5653 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5654 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5655 		if (rc != ERR)
5656 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5657 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5658 		if (rc != ERR)
5659 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5660 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5661 		if (rc != ERR)
5662 			rc = init_pair(GOT_DIFF_LINE_DATE,
5663 			    get_color_value("TOG_COLOR_DATE"), -1);
5664 		if (rc == ERR) {
5665 			err = got_error(GOT_ERR_RANGE);
5666 			goto done;
5667 		}
5668 	}
5669 
5670 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5671 	    view_is_splitscreen(view))
5672 		show_log_view(parent_view); /* draw border */
5673 	diff_view_indicate_progress(view);
5674 
5675 	err = create_diff(s);
5676 
5677 	view->show = show_diff_view;
5678 	view->input = input_diff_view;
5679 	view->reset = reset_diff_view;
5680 	view->close = close_diff_view;
5681 	view->search_start = search_start_diff_view;
5682 	view->search_setup = search_setup_diff_view;
5683 	view->search_next = search_next_view_match;
5684 done:
5685 	if (err) {
5686 		if (view->close == NULL)
5687 			close_diff_view(view);
5688 		view_close(view);
5689 	}
5690 	return err;
5691 }
5692 
5693 static const struct got_error *
5694 show_diff_view(struct tog_view *view)
5695 {
5696 	const struct got_error *err;
5697 	struct tog_diff_view_state *s = &view->state.diff;
5698 	char *id_str1 = NULL, *id_str2, *header;
5699 	const char *label1, *label2;
5700 
5701 	if (s->id1) {
5702 		err = got_object_id_str(&id_str1, s->id1);
5703 		if (err)
5704 			return err;
5705 		label1 = s->label1 ? s->label1 : id_str1;
5706 	} else
5707 		label1 = "/dev/null";
5708 
5709 	err = got_object_id_str(&id_str2, s->id2);
5710 	if (err)
5711 		return err;
5712 	label2 = s->label2 ? s->label2 : id_str2;
5713 
5714 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5715 		err = got_error_from_errno("asprintf");
5716 		free(id_str1);
5717 		free(id_str2);
5718 		return err;
5719 	}
5720 	free(id_str1);
5721 	free(id_str2);
5722 
5723 	err = draw_file(view, header);
5724 	free(header);
5725 	return err;
5726 }
5727 
5728 static const struct got_error *
5729 set_selected_commit(struct tog_diff_view_state *s,
5730     struct commit_queue_entry *entry)
5731 {
5732 	const struct got_error *err;
5733 	const struct got_object_id_queue *parent_ids;
5734 	struct got_commit_object *selected_commit;
5735 	struct got_object_qid *pid;
5736 
5737 	free(s->id2);
5738 	s->id2 = got_object_id_dup(entry->id);
5739 	if (s->id2 == NULL)
5740 		return got_error_from_errno("got_object_id_dup");
5741 
5742 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5743 	if (err)
5744 		return err;
5745 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5746 	free(s->id1);
5747 	pid = STAILQ_FIRST(parent_ids);
5748 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5749 	got_object_commit_close(selected_commit);
5750 	return NULL;
5751 }
5752 
5753 static const struct got_error *
5754 reset_diff_view(struct tog_view *view)
5755 {
5756 	struct tog_diff_view_state *s = &view->state.diff;
5757 
5758 	view->count = 0;
5759 	wclear(view->window);
5760 	s->first_displayed_line = 1;
5761 	s->last_displayed_line = view->nlines;
5762 	s->matched_line = 0;
5763 	diff_view_indicate_progress(view);
5764 	return create_diff(s);
5765 }
5766 
5767 static void
5768 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5769 {
5770 	int start, i;
5771 
5772 	i = start = s->first_displayed_line - 1;
5773 
5774 	while (s->lines[i].type != type) {
5775 		if (i == 0)
5776 			i = s->nlines - 1;
5777 		if (--i == start)
5778 			return; /* do nothing, requested type not in file */
5779 	}
5780 
5781 	s->selected_line = 1;
5782 	s->first_displayed_line = i;
5783 }
5784 
5785 static void
5786 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5787 {
5788 	int start, i;
5789 
5790 	i = start = s->first_displayed_line + 1;
5791 
5792 	while (s->lines[i].type != type) {
5793 		if (i == s->nlines - 1)
5794 			i = 0;
5795 		if (++i == start)
5796 			return; /* do nothing, requested type not in file */
5797 	}
5798 
5799 	s->selected_line = 1;
5800 	s->first_displayed_line = i;
5801 }
5802 
5803 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5804     int, int, int);
5805 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5806     int, int);
5807 
5808 static const struct got_error *
5809 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5810 {
5811 	const struct got_error *err = NULL;
5812 	struct tog_diff_view_state *s = &view->state.diff;
5813 	struct tog_log_view_state *ls;
5814 	struct commit_queue_entry *old_selected_entry;
5815 	char *line = NULL;
5816 	size_t linesize = 0;
5817 	ssize_t linelen;
5818 	int i, nscroll = view->nlines - 1, up = 0;
5819 
5820 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5821 
5822 	switch (ch) {
5823 	case '0':
5824 	case '$':
5825 	case KEY_RIGHT:
5826 	case 'l':
5827 	case KEY_LEFT:
5828 	case 'h':
5829 		horizontal_scroll_input(view, ch);
5830 		break;
5831 	case 'a':
5832 	case 'w':
5833 		if (ch == 'a') {
5834 			s->force_text_diff = !s->force_text_diff;
5835 			view->action = s->force_text_diff ?
5836 			    "force ASCII text enabled" :
5837 			    "force ASCII text disabled";
5838 		}
5839 		else if (ch == 'w') {
5840 			s->ignore_whitespace = !s->ignore_whitespace;
5841 			view->action = s->ignore_whitespace ?
5842 			    "ignore whitespace enabled" :
5843 			    "ignore whitespace disabled";
5844 		}
5845 		err = reset_diff_view(view);
5846 		break;
5847 	case 'g':
5848 	case KEY_HOME:
5849 		s->first_displayed_line = 1;
5850 		view->count = 0;
5851 		break;
5852 	case 'G':
5853 	case KEY_END:
5854 		view->count = 0;
5855 		if (s->eof)
5856 			break;
5857 
5858 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5859 		s->eof = 1;
5860 		break;
5861 	case 'k':
5862 	case KEY_UP:
5863 	case CTRL('p'):
5864 		if (s->first_displayed_line > 1)
5865 			s->first_displayed_line--;
5866 		else
5867 			view->count = 0;
5868 		break;
5869 	case CTRL('u'):
5870 	case 'u':
5871 		nscroll /= 2;
5872 		/* FALL THROUGH */
5873 	case KEY_PPAGE:
5874 	case CTRL('b'):
5875 	case 'b':
5876 		if (s->first_displayed_line == 1) {
5877 			view->count = 0;
5878 			break;
5879 		}
5880 		i = 0;
5881 		while (i++ < nscroll && s->first_displayed_line > 1)
5882 			s->first_displayed_line--;
5883 		break;
5884 	case 'j':
5885 	case KEY_DOWN:
5886 	case CTRL('n'):
5887 		if (!s->eof)
5888 			s->first_displayed_line++;
5889 		else
5890 			view->count = 0;
5891 		break;
5892 	case CTRL('d'):
5893 	case 'd':
5894 		nscroll /= 2;
5895 		/* FALL THROUGH */
5896 	case KEY_NPAGE:
5897 	case CTRL('f'):
5898 	case 'f':
5899 	case ' ':
5900 		if (s->eof) {
5901 			view->count = 0;
5902 			break;
5903 		}
5904 		i = 0;
5905 		while (!s->eof && i++ < nscroll) {
5906 			linelen = getline(&line, &linesize, s->f);
5907 			s->first_displayed_line++;
5908 			if (linelen == -1) {
5909 				if (feof(s->f)) {
5910 					s->eof = 1;
5911 				} else
5912 					err = got_ferror(s->f, GOT_ERR_IO);
5913 				break;
5914 			}
5915 		}
5916 		free(line);
5917 		break;
5918 	case '(':
5919 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5920 		break;
5921 	case ')':
5922 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5923 		break;
5924 	case '{':
5925 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5926 		break;
5927 	case '}':
5928 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5929 		break;
5930 	case '[':
5931 		if (s->diff_context > 0) {
5932 			s->diff_context--;
5933 			s->matched_line = 0;
5934 			diff_view_indicate_progress(view);
5935 			err = create_diff(s);
5936 			if (s->first_displayed_line + view->nlines - 1 >
5937 			    s->nlines) {
5938 				s->first_displayed_line = 1;
5939 				s->last_displayed_line = view->nlines;
5940 			}
5941 		} else
5942 			view->count = 0;
5943 		break;
5944 	case ']':
5945 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5946 			s->diff_context++;
5947 			s->matched_line = 0;
5948 			diff_view_indicate_progress(view);
5949 			err = create_diff(s);
5950 		} else
5951 			view->count = 0;
5952 		break;
5953 	case '<':
5954 	case ',':
5955 	case 'K':
5956 		up = 1;
5957 		/* FALL THROUGH */
5958 	case '>':
5959 	case '.':
5960 	case 'J':
5961 		if (s->parent_view == NULL) {
5962 			view->count = 0;
5963 			break;
5964 		}
5965 		s->parent_view->count = view->count;
5966 
5967 		if (s->parent_view->type == TOG_VIEW_LOG) {
5968 			ls = &s->parent_view->state.log;
5969 			old_selected_entry = ls->selected_entry;
5970 
5971 			err = input_log_view(NULL, s->parent_view,
5972 			    up ? KEY_UP : KEY_DOWN);
5973 			if (err)
5974 				break;
5975 			view->count = s->parent_view->count;
5976 
5977 			if (old_selected_entry == ls->selected_entry)
5978 				break;
5979 
5980 			err = set_selected_commit(s, ls->selected_entry);
5981 			if (err)
5982 				break;
5983 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5984 			struct tog_blame_view_state *bs;
5985 			struct got_object_id *id, *prev_id;
5986 
5987 			bs = &s->parent_view->state.blame;
5988 			prev_id = get_annotation_for_line(bs->blame.lines,
5989 			    bs->blame.nlines, bs->last_diffed_line);
5990 
5991 			err = input_blame_view(&view, s->parent_view,
5992 			    up ? KEY_UP : KEY_DOWN);
5993 			if (err)
5994 				break;
5995 			view->count = s->parent_view->count;
5996 
5997 			if (prev_id == NULL)
5998 				break;
5999 			id = get_selected_commit_id(bs->blame.lines,
6000 			    bs->blame.nlines, bs->first_displayed_line,
6001 			    bs->selected_line);
6002 			if (id == NULL)
6003 				break;
6004 
6005 			if (!got_object_id_cmp(prev_id, id))
6006 				break;
6007 
6008 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6009 			if (err)
6010 				break;
6011 		}
6012 		s->first_displayed_line = 1;
6013 		s->last_displayed_line = view->nlines;
6014 		s->matched_line = 0;
6015 		view->x = 0;
6016 
6017 		diff_view_indicate_progress(view);
6018 		err = create_diff(s);
6019 		break;
6020 	default:
6021 		view->count = 0;
6022 		break;
6023 	}
6024 
6025 	return err;
6026 }
6027 
6028 static const struct got_error *
6029 cmd_diff(int argc, char *argv[])
6030 {
6031 	const struct got_error *error;
6032 	struct got_repository *repo = NULL;
6033 	struct got_worktree *worktree = NULL;
6034 	struct got_object_id *id1 = NULL, *id2 = NULL;
6035 	char *repo_path = NULL, *cwd = NULL;
6036 	char *id_str1 = NULL, *id_str2 = NULL;
6037 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6038 	char *label1 = NULL, *label2 = NULL;
6039 	int diff_context = 3, ignore_whitespace = 0;
6040 	int ch, force_text_diff = 0;
6041 	const char *errstr;
6042 	struct tog_view *view;
6043 	int *pack_fds = NULL;
6044 
6045 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6046 		switch (ch) {
6047 		case 'a':
6048 			force_text_diff = 1;
6049 			break;
6050 		case 'C':
6051 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6052 			    &errstr);
6053 			if (errstr != NULL)
6054 				errx(1, "number of context lines is %s: %s",
6055 				    errstr, errstr);
6056 			break;
6057 		case 'r':
6058 			repo_path = realpath(optarg, NULL);
6059 			if (repo_path == NULL)
6060 				return got_error_from_errno2("realpath",
6061 				    optarg);
6062 			got_path_strip_trailing_slashes(repo_path);
6063 			break;
6064 		case 'w':
6065 			ignore_whitespace = 1;
6066 			break;
6067 		default:
6068 			usage_diff();
6069 			/* NOTREACHED */
6070 		}
6071 	}
6072 
6073 	argc -= optind;
6074 	argv += optind;
6075 
6076 	if (argc == 0) {
6077 		usage_diff(); /* TODO show local worktree changes */
6078 	} else if (argc == 2) {
6079 		id_str1 = argv[0];
6080 		id_str2 = argv[1];
6081 	} else
6082 		usage_diff();
6083 
6084 	error = got_repo_pack_fds_open(&pack_fds);
6085 	if (error)
6086 		goto done;
6087 
6088 	if (repo_path == NULL) {
6089 		cwd = getcwd(NULL, 0);
6090 		if (cwd == NULL)
6091 			return got_error_from_errno("getcwd");
6092 		error = got_worktree_open(&worktree, cwd, NULL);
6093 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6094 			goto done;
6095 		if (worktree)
6096 			repo_path =
6097 			    strdup(got_worktree_get_repo_path(worktree));
6098 		else
6099 			repo_path = strdup(cwd);
6100 		if (repo_path == NULL) {
6101 			error = got_error_from_errno("strdup");
6102 			goto done;
6103 		}
6104 	}
6105 
6106 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6107 	if (error)
6108 		goto done;
6109 
6110 	init_curses();
6111 
6112 	error = apply_unveil(got_repo_get_path(repo), NULL);
6113 	if (error)
6114 		goto done;
6115 
6116 	error = tog_load_refs(repo, 0);
6117 	if (error)
6118 		goto done;
6119 
6120 	if (id_str1 != NULL) {
6121 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6122 		    repo, worktree);
6123 		if (error != NULL)
6124 			goto done;
6125 		if (keyword_idstr1 != NULL)
6126 			id_str1 = keyword_idstr1;
6127 	}
6128 	if (id_str2 != NULL) {
6129 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6130 		    repo, worktree);
6131 		if (error != NULL)
6132 			goto done;
6133 		if (keyword_idstr2 != NULL)
6134 			id_str2 = keyword_idstr2;
6135 	}
6136 
6137 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6138 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6139 	if (error)
6140 		goto done;
6141 
6142 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6143 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6144 	if (error)
6145 		goto done;
6146 
6147 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6148 	if (view == NULL) {
6149 		error = got_error_from_errno("view_open");
6150 		goto done;
6151 	}
6152 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6153 	    ignore_whitespace, force_text_diff, NULL,  repo);
6154 	if (error)
6155 		goto done;
6156 
6157 	if (worktree) {
6158 		error = set_tog_base_commit(repo, worktree);
6159 		if (error != NULL)
6160 			goto done;
6161 	}
6162 
6163 	error = view_loop(view);
6164 
6165 done:
6166 	free(tog_base_commit.id);
6167 	free(keyword_idstr1);
6168 	free(keyword_idstr2);
6169 	free(label1);
6170 	free(label2);
6171 	free(repo_path);
6172 	free(cwd);
6173 	if (repo) {
6174 		const struct got_error *close_err = got_repo_close(repo);
6175 		if (error == NULL)
6176 			error = close_err;
6177 	}
6178 	if (worktree)
6179 		got_worktree_close(worktree);
6180 	if (pack_fds) {
6181 		const struct got_error *pack_err =
6182 		    got_repo_pack_fds_close(pack_fds);
6183 		if (error == NULL)
6184 			error = pack_err;
6185 	}
6186 	tog_free_refs();
6187 	return error;
6188 }
6189 
6190 __dead static void
6191 usage_blame(void)
6192 {
6193 	endwin();
6194 	fprintf(stderr,
6195 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6196 	    getprogname());
6197 	exit(1);
6198 }
6199 
6200 struct tog_blame_line {
6201 	int annotated;
6202 	struct got_object_id *id;
6203 };
6204 
6205 static const struct got_error *
6206 draw_blame(struct tog_view *view)
6207 {
6208 	struct tog_blame_view_state *s = &view->state.blame;
6209 	struct tog_blame *blame = &s->blame;
6210 	regmatch_t *regmatch = &view->regmatch;
6211 	const struct got_error *err;
6212 	int lineno = 0, nprinted = 0;
6213 	char *line = NULL;
6214 	size_t linesize = 0;
6215 	ssize_t linelen;
6216 	wchar_t *wline;
6217 	int width;
6218 	struct tog_blame_line *blame_line;
6219 	struct got_object_id *prev_id = NULL;
6220 	char *id_str;
6221 	struct tog_color *tc;
6222 
6223 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6224 	if (err)
6225 		return err;
6226 
6227 	rewind(blame->f);
6228 	werase(view->window);
6229 
6230 	if (asprintf(&line, "commit %s", id_str) == -1) {
6231 		err = got_error_from_errno("asprintf");
6232 		free(id_str);
6233 		return err;
6234 	}
6235 
6236 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6237 	free(line);
6238 	line = NULL;
6239 	if (err)
6240 		return err;
6241 	if (view_needs_focus_indication(view))
6242 		wstandout(view->window);
6243 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6244 	if (tc)
6245 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6246 	waddwstr(view->window, wline);
6247 	while (width++ < view->ncols)
6248 		waddch(view->window, ' ');
6249 	if (tc)
6250 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6251 	if (view_needs_focus_indication(view))
6252 		wstandend(view->window);
6253 	free(wline);
6254 	wline = NULL;
6255 
6256 	if (view->gline > blame->nlines)
6257 		view->gline = blame->nlines;
6258 
6259 	if (tog_io.wait_for_ui) {
6260 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6261 		int rc;
6262 
6263 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6264 		if (rc)
6265 			return got_error_set_errno(rc, "pthread_cond_wait");
6266 		tog_io.wait_for_ui = 0;
6267 	}
6268 
6269 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6270 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6271 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6272 		free(id_str);
6273 		return got_error_from_errno("asprintf");
6274 	}
6275 	free(id_str);
6276 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6277 	free(line);
6278 	line = NULL;
6279 	if (err)
6280 		return err;
6281 	waddwstr(view->window, wline);
6282 	free(wline);
6283 	wline = NULL;
6284 	if (width < view->ncols - 1)
6285 		waddch(view->window, '\n');
6286 
6287 	s->eof = 0;
6288 	view->maxx = 0;
6289 	while (nprinted < view->nlines - 2) {
6290 		linelen = getline(&line, &linesize, blame->f);
6291 		if (linelen == -1) {
6292 			if (feof(blame->f)) {
6293 				s->eof = 1;
6294 				break;
6295 			}
6296 			free(line);
6297 			return got_ferror(blame->f, GOT_ERR_IO);
6298 		}
6299 		if (++lineno < s->first_displayed_line)
6300 			continue;
6301 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6302 			continue;
6303 
6304 		/* Set view->maxx based on full line length. */
6305 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6306 		if (err) {
6307 			free(line);
6308 			return err;
6309 		}
6310 		free(wline);
6311 		wline = NULL;
6312 		view->maxx = MAX(view->maxx, width);
6313 
6314 		if (nprinted == s->selected_line - 1)
6315 			wstandout(view->window);
6316 
6317 		if (blame->nlines > 0) {
6318 			blame_line = &blame->lines[lineno - 1];
6319 			if (blame_line->annotated && prev_id &&
6320 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6321 			    !(nprinted == s->selected_line - 1)) {
6322 				waddstr(view->window, "        ");
6323 			} else if (blame_line->annotated) {
6324 				char *id_str;
6325 				err = got_object_id_str(&id_str,
6326 				    blame_line->id);
6327 				if (err) {
6328 					free(line);
6329 					return err;
6330 				}
6331 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6332 				if (tc)
6333 					wattr_on(view->window,
6334 					    COLOR_PAIR(tc->colorpair), NULL);
6335 				wprintw(view->window, "%.8s", id_str);
6336 				if (tc)
6337 					wattr_off(view->window,
6338 					    COLOR_PAIR(tc->colorpair), NULL);
6339 				free(id_str);
6340 				prev_id = blame_line->id;
6341 			} else {
6342 				waddstr(view->window, "........");
6343 				prev_id = NULL;
6344 			}
6345 		} else {
6346 			waddstr(view->window, "........");
6347 			prev_id = NULL;
6348 		}
6349 
6350 		if (nprinted == s->selected_line - 1)
6351 			wstandend(view->window);
6352 		waddstr(view->window, " ");
6353 
6354 		if (view->ncols <= 9) {
6355 			width = 9;
6356 		} else if (s->first_displayed_line + nprinted ==
6357 		    s->matched_line &&
6358 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6359 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6360 			    view->window, view->x, regmatch);
6361 			if (err) {
6362 				free(line);
6363 				return err;
6364 			}
6365 			width += 9;
6366 		} else {
6367 			int skip;
6368 			err = format_line(&wline, &width, &skip, line,
6369 			    view->x, view->ncols - 9, 9, 1);
6370 			if (err) {
6371 				free(line);
6372 				return err;
6373 			}
6374 			waddwstr(view->window, &wline[skip]);
6375 			width += 9;
6376 			free(wline);
6377 			wline = NULL;
6378 		}
6379 
6380 		if (width <= view->ncols - 1)
6381 			waddch(view->window, '\n');
6382 		if (++nprinted == 1)
6383 			s->first_displayed_line = lineno;
6384 	}
6385 	free(line);
6386 	s->last_displayed_line = lineno;
6387 
6388 	view_border(view);
6389 
6390 	return NULL;
6391 }
6392 
6393 static const struct got_error *
6394 blame_cb(void *arg, int nlines, int lineno,
6395     struct got_commit_object *commit, struct got_object_id *id)
6396 {
6397 	const struct got_error *err = NULL;
6398 	struct tog_blame_cb_args *a = arg;
6399 	struct tog_blame_line *line;
6400 	int errcode;
6401 
6402 	if (nlines != a->nlines ||
6403 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6404 		return got_error(GOT_ERR_RANGE);
6405 
6406 	errcode = pthread_mutex_lock(&tog_mutex);
6407 	if (errcode)
6408 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6409 
6410 	if (*a->quit) {	/* user has quit the blame view */
6411 		err = got_error(GOT_ERR_ITER_COMPLETED);
6412 		goto done;
6413 	}
6414 
6415 	if (lineno == -1)
6416 		goto done; /* no change in this commit */
6417 
6418 	line = &a->lines[lineno - 1];
6419 	if (line->annotated)
6420 		goto done;
6421 
6422 	line->id = got_object_id_dup(id);
6423 	if (line->id == NULL) {
6424 		err = got_error_from_errno("got_object_id_dup");
6425 		goto done;
6426 	}
6427 	line->annotated = 1;
6428 done:
6429 	errcode = pthread_mutex_unlock(&tog_mutex);
6430 	if (errcode)
6431 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6432 	return err;
6433 }
6434 
6435 static void *
6436 blame_thread(void *arg)
6437 {
6438 	const struct got_error *err, *close_err;
6439 	struct tog_blame_thread_args *ta = arg;
6440 	struct tog_blame_cb_args *a = ta->cb_args;
6441 	int errcode, fd1 = -1, fd2 = -1;
6442 	FILE *f1 = NULL, *f2 = NULL;
6443 
6444 	fd1 = got_opentempfd();
6445 	if (fd1 == -1)
6446 		return (void *)got_error_from_errno("got_opentempfd");
6447 
6448 	fd2 = got_opentempfd();
6449 	if (fd2 == -1) {
6450 		err = got_error_from_errno("got_opentempfd");
6451 		goto done;
6452 	}
6453 
6454 	f1 = got_opentemp();
6455 	if (f1 == NULL) {
6456 		err = (void *)got_error_from_errno("got_opentemp");
6457 		goto done;
6458 	}
6459 	f2 = got_opentemp();
6460 	if (f2 == NULL) {
6461 		err = (void *)got_error_from_errno("got_opentemp");
6462 		goto done;
6463 	}
6464 
6465 	err = block_signals_used_by_main_thread();
6466 	if (err)
6467 		goto done;
6468 
6469 	err = got_blame(ta->path, a->commit_id, ta->repo,
6470 	    tog_diff_algo, blame_cb, ta->cb_args,
6471 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6472 	if (err && err->code == GOT_ERR_CANCELLED)
6473 		err = NULL;
6474 
6475 	errcode = pthread_mutex_lock(&tog_mutex);
6476 	if (errcode) {
6477 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6478 		goto done;
6479 	}
6480 
6481 	close_err = got_repo_close(ta->repo);
6482 	if (err == NULL)
6483 		err = close_err;
6484 	ta->repo = NULL;
6485 	*ta->complete = 1;
6486 
6487 	if (tog_io.wait_for_ui) {
6488 		errcode = pthread_cond_signal(&ta->blame_complete);
6489 		if (errcode && err == NULL)
6490 			err = got_error_set_errno(errcode,
6491 			    "pthread_cond_signal");
6492 	}
6493 
6494 	errcode = pthread_mutex_unlock(&tog_mutex);
6495 	if (errcode && err == NULL)
6496 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6497 
6498 done:
6499 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6500 		err = got_error_from_errno("close");
6501 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6502 		err = got_error_from_errno("close");
6503 	if (f1 && fclose(f1) == EOF && err == NULL)
6504 		err = got_error_from_errno("fclose");
6505 	if (f2 && fclose(f2) == EOF && err == NULL)
6506 		err = got_error_from_errno("fclose");
6507 
6508 	return (void *)err;
6509 }
6510 
6511 static struct got_object_id *
6512 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6513     int first_displayed_line, int selected_line)
6514 {
6515 	struct tog_blame_line *line;
6516 
6517 	if (nlines <= 0)
6518 		return NULL;
6519 
6520 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6521 	if (!line->annotated)
6522 		return NULL;
6523 
6524 	return line->id;
6525 }
6526 
6527 static struct got_object_id *
6528 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6529     int lineno)
6530 {
6531 	struct tog_blame_line *line;
6532 
6533 	if (nlines <= 0 || lineno >= nlines)
6534 		return NULL;
6535 
6536 	line = &lines[lineno - 1];
6537 	if (!line->annotated)
6538 		return NULL;
6539 
6540 	return line->id;
6541 }
6542 
6543 static const struct got_error *
6544 stop_blame(struct tog_blame *blame)
6545 {
6546 	const struct got_error *err = NULL;
6547 	int i;
6548 
6549 	if (blame->thread) {
6550 		int errcode;
6551 		errcode = pthread_mutex_unlock(&tog_mutex);
6552 		if (errcode)
6553 			return got_error_set_errno(errcode,
6554 			    "pthread_mutex_unlock");
6555 		errcode = pthread_join(blame->thread, (void **)&err);
6556 		if (errcode)
6557 			return got_error_set_errno(errcode, "pthread_join");
6558 		errcode = pthread_mutex_lock(&tog_mutex);
6559 		if (errcode)
6560 			return got_error_set_errno(errcode,
6561 			    "pthread_mutex_lock");
6562 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6563 			err = NULL;
6564 		blame->thread = NULL;
6565 	}
6566 	if (blame->thread_args.repo) {
6567 		const struct got_error *close_err;
6568 		close_err = got_repo_close(blame->thread_args.repo);
6569 		if (err == NULL)
6570 			err = close_err;
6571 		blame->thread_args.repo = NULL;
6572 	}
6573 	if (blame->f) {
6574 		if (fclose(blame->f) == EOF && err == NULL)
6575 			err = got_error_from_errno("fclose");
6576 		blame->f = NULL;
6577 	}
6578 	if (blame->lines) {
6579 		for (i = 0; i < blame->nlines; i++)
6580 			free(blame->lines[i].id);
6581 		free(blame->lines);
6582 		blame->lines = NULL;
6583 	}
6584 	free(blame->cb_args.commit_id);
6585 	blame->cb_args.commit_id = NULL;
6586 	if (blame->pack_fds) {
6587 		const struct got_error *pack_err =
6588 		    got_repo_pack_fds_close(blame->pack_fds);
6589 		if (err == NULL)
6590 			err = pack_err;
6591 		blame->pack_fds = NULL;
6592 	}
6593 	return err;
6594 }
6595 
6596 static const struct got_error *
6597 cancel_blame_view(void *arg)
6598 {
6599 	const struct got_error *err = NULL;
6600 	int *done = arg;
6601 	int errcode;
6602 
6603 	errcode = pthread_mutex_lock(&tog_mutex);
6604 	if (errcode)
6605 		return got_error_set_errno(errcode,
6606 		    "pthread_mutex_unlock");
6607 
6608 	if (*done)
6609 		err = got_error(GOT_ERR_CANCELLED);
6610 
6611 	errcode = pthread_mutex_unlock(&tog_mutex);
6612 	if (errcode)
6613 		return got_error_set_errno(errcode,
6614 		    "pthread_mutex_lock");
6615 
6616 	return err;
6617 }
6618 
6619 static const struct got_error *
6620 run_blame(struct tog_view *view)
6621 {
6622 	struct tog_blame_view_state *s = &view->state.blame;
6623 	struct tog_blame *blame = &s->blame;
6624 	const struct got_error *err = NULL;
6625 	struct got_commit_object *commit = NULL;
6626 	struct got_blob_object *blob = NULL;
6627 	struct got_repository *thread_repo = NULL;
6628 	struct got_object_id *obj_id = NULL;
6629 	int obj_type, fd = -1;
6630 	int *pack_fds = NULL;
6631 
6632 	err = got_object_open_as_commit(&commit, s->repo,
6633 	    &s->blamed_commit->id);
6634 	if (err)
6635 		return err;
6636 
6637 	fd = got_opentempfd();
6638 	if (fd == -1) {
6639 		err = got_error_from_errno("got_opentempfd");
6640 		goto done;
6641 	}
6642 
6643 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6644 	if (err)
6645 		goto done;
6646 
6647 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6648 	if (err)
6649 		goto done;
6650 
6651 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6652 		err = got_error(GOT_ERR_OBJ_TYPE);
6653 		goto done;
6654 	}
6655 
6656 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6657 	if (err)
6658 		goto done;
6659 	blame->f = got_opentemp();
6660 	if (blame->f == NULL) {
6661 		err = got_error_from_errno("got_opentemp");
6662 		goto done;
6663 	}
6664 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6665 	    &blame->line_offsets, blame->f, blob);
6666 	if (err)
6667 		goto done;
6668 	if (blame->nlines == 0) {
6669 		s->blame_complete = 1;
6670 		goto done;
6671 	}
6672 
6673 	/* Don't include \n at EOF in the blame line count. */
6674 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6675 		blame->nlines--;
6676 
6677 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6678 	if (blame->lines == NULL) {
6679 		err = got_error_from_errno("calloc");
6680 		goto done;
6681 	}
6682 
6683 	err = got_repo_pack_fds_open(&pack_fds);
6684 	if (err)
6685 		goto done;
6686 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6687 	    pack_fds);
6688 	if (err)
6689 		goto done;
6690 
6691 	blame->pack_fds = pack_fds;
6692 	blame->cb_args.view = view;
6693 	blame->cb_args.lines = blame->lines;
6694 	blame->cb_args.nlines = blame->nlines;
6695 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6696 	if (blame->cb_args.commit_id == NULL) {
6697 		err = got_error_from_errno("got_object_id_dup");
6698 		goto done;
6699 	}
6700 	blame->cb_args.quit = &s->done;
6701 
6702 	blame->thread_args.path = s->path;
6703 	blame->thread_args.repo = thread_repo;
6704 	blame->thread_args.cb_args = &blame->cb_args;
6705 	blame->thread_args.complete = &s->blame_complete;
6706 	blame->thread_args.cancel_cb = cancel_blame_view;
6707 	blame->thread_args.cancel_arg = &s->done;
6708 	s->blame_complete = 0;
6709 
6710 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6711 		s->first_displayed_line = 1;
6712 		s->last_displayed_line = view->nlines;
6713 		s->selected_line = 1;
6714 	}
6715 	s->matched_line = 0;
6716 
6717 done:
6718 	if (commit)
6719 		got_object_commit_close(commit);
6720 	if (fd != -1 && close(fd) == -1 && err == NULL)
6721 		err = got_error_from_errno("close");
6722 	if (blob)
6723 		got_object_blob_close(blob);
6724 	free(obj_id);
6725 	if (err)
6726 		stop_blame(blame);
6727 	return err;
6728 }
6729 
6730 static const struct got_error *
6731 open_blame_view(struct tog_view *view, char *path,
6732     struct got_object_id *commit_id, struct got_repository *repo)
6733 {
6734 	const struct got_error *err = NULL;
6735 	struct tog_blame_view_state *s = &view->state.blame;
6736 
6737 	STAILQ_INIT(&s->blamed_commits);
6738 
6739 	s->path = strdup(path);
6740 	if (s->path == NULL)
6741 		return got_error_from_errno("strdup");
6742 
6743 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6744 	if (err) {
6745 		free(s->path);
6746 		return err;
6747 	}
6748 
6749 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6750 	s->first_displayed_line = 1;
6751 	s->last_displayed_line = view->nlines;
6752 	s->selected_line = 1;
6753 	s->blame_complete = 0;
6754 	s->repo = repo;
6755 	s->commit_id = commit_id;
6756 	memset(&s->blame, 0, sizeof(s->blame));
6757 
6758 	STAILQ_INIT(&s->colors);
6759 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6760 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6761 		    get_color_value("TOG_COLOR_COMMIT"));
6762 		if (err)
6763 			return err;
6764 	}
6765 
6766 	view->show = show_blame_view;
6767 	view->input = input_blame_view;
6768 	view->reset = reset_blame_view;
6769 	view->close = close_blame_view;
6770 	view->search_start = search_start_blame_view;
6771 	view->search_setup = search_setup_blame_view;
6772 	view->search_next = search_next_view_match;
6773 
6774 	if (using_mock_io) {
6775 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6776 		int rc;
6777 
6778 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6779 		if (rc)
6780 			return got_error_set_errno(rc, "pthread_cond_init");
6781 	}
6782 
6783 	return run_blame(view);
6784 }
6785 
6786 static const struct got_error *
6787 close_blame_view(struct tog_view *view)
6788 {
6789 	const struct got_error *err = NULL;
6790 	struct tog_blame_view_state *s = &view->state.blame;
6791 
6792 	if (s->blame.thread)
6793 		err = stop_blame(&s->blame);
6794 
6795 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6796 		struct got_object_qid *blamed_commit;
6797 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6798 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6799 		got_object_qid_free(blamed_commit);
6800 	}
6801 
6802 	if (using_mock_io) {
6803 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6804 		int rc;
6805 
6806 		rc = pthread_cond_destroy(&bta->blame_complete);
6807 		if (rc && err == NULL)
6808 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6809 	}
6810 
6811 	free(s->path);
6812 	free_colors(&s->colors);
6813 	return err;
6814 }
6815 
6816 static const struct got_error *
6817 search_start_blame_view(struct tog_view *view)
6818 {
6819 	struct tog_blame_view_state *s = &view->state.blame;
6820 
6821 	s->matched_line = 0;
6822 	return NULL;
6823 }
6824 
6825 static void
6826 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6827     size_t *nlines, int **first, int **last, int **match, int **selected)
6828 {
6829 	struct tog_blame_view_state *s = &view->state.blame;
6830 
6831 	*f = s->blame.f;
6832 	*nlines = s->blame.nlines;
6833 	*line_offsets = s->blame.line_offsets;
6834 	*match = &s->matched_line;
6835 	*first = &s->first_displayed_line;
6836 	*last = &s->last_displayed_line;
6837 	*selected = &s->selected_line;
6838 }
6839 
6840 static const struct got_error *
6841 show_blame_view(struct tog_view *view)
6842 {
6843 	const struct got_error *err = NULL;
6844 	struct tog_blame_view_state *s = &view->state.blame;
6845 	int errcode;
6846 
6847 	if (s->blame.thread == NULL && !s->blame_complete) {
6848 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6849 		    &s->blame.thread_args);
6850 		if (errcode)
6851 			return got_error_set_errno(errcode, "pthread_create");
6852 
6853 		if (!using_mock_io)
6854 			halfdelay(1); /* fast refresh while annotating  */
6855 	}
6856 
6857 	if (s->blame_complete && !using_mock_io)
6858 		halfdelay(10); /* disable fast refresh */
6859 
6860 	err = draw_blame(view);
6861 
6862 	view_border(view);
6863 	return err;
6864 }
6865 
6866 static const struct got_error *
6867 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6868     struct got_repository *repo, struct got_object_id *id)
6869 {
6870 	struct tog_view		*log_view;
6871 	const struct got_error	*err = NULL;
6872 
6873 	*new_view = NULL;
6874 
6875 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6876 	if (log_view == NULL)
6877 		return got_error_from_errno("view_open");
6878 
6879 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6880 	if (err)
6881 		view_close(log_view);
6882 	else
6883 		*new_view = log_view;
6884 
6885 	return err;
6886 }
6887 
6888 static const struct got_error *
6889 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6890 {
6891 	const struct got_error *err = NULL, *thread_err = NULL;
6892 	struct tog_view *diff_view;
6893 	struct tog_blame_view_state *s = &view->state.blame;
6894 	int eos, nscroll, begin_y = 0, begin_x = 0;
6895 
6896 	eos = nscroll = view->nlines - 2;
6897 	if (view_is_hsplit_top(view))
6898 		--eos;  /* border */
6899 
6900 	switch (ch) {
6901 	case '0':
6902 	case '$':
6903 	case KEY_RIGHT:
6904 	case 'l':
6905 	case KEY_LEFT:
6906 	case 'h':
6907 		horizontal_scroll_input(view, ch);
6908 		break;
6909 	case 'q':
6910 		s->done = 1;
6911 		break;
6912 	case 'g':
6913 	case KEY_HOME:
6914 		s->selected_line = 1;
6915 		s->first_displayed_line = 1;
6916 		view->count = 0;
6917 		break;
6918 	case 'G':
6919 	case KEY_END:
6920 		if (s->blame.nlines < eos) {
6921 			s->selected_line = s->blame.nlines;
6922 			s->first_displayed_line = 1;
6923 		} else {
6924 			s->selected_line = eos;
6925 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6926 		}
6927 		view->count = 0;
6928 		break;
6929 	case 'k':
6930 	case KEY_UP:
6931 	case CTRL('p'):
6932 		if (s->selected_line > 1)
6933 			s->selected_line--;
6934 		else if (s->selected_line == 1 &&
6935 		    s->first_displayed_line > 1)
6936 			s->first_displayed_line--;
6937 		else
6938 			view->count = 0;
6939 		break;
6940 	case CTRL('u'):
6941 	case 'u':
6942 		nscroll /= 2;
6943 		/* FALL THROUGH */
6944 	case KEY_PPAGE:
6945 	case CTRL('b'):
6946 	case 'b':
6947 		if (s->first_displayed_line == 1) {
6948 			if (view->count > 1)
6949 				nscroll += nscroll;
6950 			s->selected_line = MAX(1, s->selected_line - nscroll);
6951 			view->count = 0;
6952 			break;
6953 		}
6954 		if (s->first_displayed_line > nscroll)
6955 			s->first_displayed_line -= nscroll;
6956 		else
6957 			s->first_displayed_line = 1;
6958 		break;
6959 	case 'j':
6960 	case KEY_DOWN:
6961 	case CTRL('n'):
6962 		if (s->selected_line < eos && s->first_displayed_line +
6963 		    s->selected_line <= s->blame.nlines)
6964 			s->selected_line++;
6965 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6966 			s->first_displayed_line++;
6967 		else
6968 			view->count = 0;
6969 		break;
6970 	case 'c':
6971 	case 'p': {
6972 		struct got_object_id *id = NULL;
6973 
6974 		view->count = 0;
6975 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6976 		    s->first_displayed_line, s->selected_line);
6977 		if (id == NULL)
6978 			break;
6979 		if (ch == 'p') {
6980 			struct got_commit_object *commit, *pcommit;
6981 			struct got_object_qid *pid;
6982 			struct got_object_id *blob_id = NULL;
6983 			int obj_type;
6984 			err = got_object_open_as_commit(&commit,
6985 			    s->repo, id);
6986 			if (err)
6987 				break;
6988 			pid = STAILQ_FIRST(
6989 			    got_object_commit_get_parent_ids(commit));
6990 			if (pid == NULL) {
6991 				got_object_commit_close(commit);
6992 				break;
6993 			}
6994 			/* Check if path history ends here. */
6995 			err = got_object_open_as_commit(&pcommit,
6996 			    s->repo, &pid->id);
6997 			if (err)
6998 				break;
6999 			err = got_object_id_by_path(&blob_id, s->repo,
7000 			    pcommit, s->path);
7001 			got_object_commit_close(pcommit);
7002 			if (err) {
7003 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7004 					err = NULL;
7005 				got_object_commit_close(commit);
7006 				break;
7007 			}
7008 			err = got_object_get_type(&obj_type, s->repo,
7009 			    blob_id);
7010 			free(blob_id);
7011 			/* Can't blame non-blob type objects. */
7012 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7013 				got_object_commit_close(commit);
7014 				break;
7015 			}
7016 			err = got_object_qid_alloc(&s->blamed_commit,
7017 			    &pid->id);
7018 			got_object_commit_close(commit);
7019 		} else {
7020 			if (got_object_id_cmp(id,
7021 			    &s->blamed_commit->id) == 0)
7022 				break;
7023 			err = got_object_qid_alloc(&s->blamed_commit,
7024 			    id);
7025 		}
7026 		if (err)
7027 			break;
7028 		s->done = 1;
7029 		thread_err = stop_blame(&s->blame);
7030 		s->done = 0;
7031 		if (thread_err)
7032 			break;
7033 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7034 		    s->blamed_commit, entry);
7035 		err = run_blame(view);
7036 		if (err)
7037 			break;
7038 		break;
7039 	}
7040 	case 'C': {
7041 		struct got_object_qid *first;
7042 
7043 		view->count = 0;
7044 		first = STAILQ_FIRST(&s->blamed_commits);
7045 		if (!got_object_id_cmp(&first->id, s->commit_id))
7046 			break;
7047 		s->done = 1;
7048 		thread_err = stop_blame(&s->blame);
7049 		s->done = 0;
7050 		if (thread_err)
7051 			break;
7052 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7053 		got_object_qid_free(s->blamed_commit);
7054 		s->blamed_commit =
7055 		    STAILQ_FIRST(&s->blamed_commits);
7056 		err = run_blame(view);
7057 		if (err)
7058 			break;
7059 		break;
7060 	}
7061 	case 'L':
7062 		view->count = 0;
7063 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7064 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7065 		if (s->id_to_log)
7066 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7067 		break;
7068 	case KEY_ENTER:
7069 	case '\r': {
7070 		struct got_object_id *id = NULL;
7071 		struct got_object_qid *pid;
7072 		struct got_commit_object *commit = NULL;
7073 
7074 		view->count = 0;
7075 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7076 		    s->first_displayed_line, s->selected_line);
7077 		if (id == NULL)
7078 			break;
7079 		err = got_object_open_as_commit(&commit, s->repo, id);
7080 		if (err)
7081 			break;
7082 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7083 		if (*new_view) {
7084 			/* traversed from diff view, release diff resources  */
7085 			err = close_diff_view(*new_view);
7086 			if (err)
7087 				break;
7088 			diff_view = *new_view;
7089 		} else {
7090 			if (view_is_parent_view(view))
7091 				view_get_split(view, &begin_y, &begin_x);
7092 
7093 			diff_view = view_open(0, 0, begin_y, begin_x,
7094 			    TOG_VIEW_DIFF);
7095 			if (diff_view == NULL) {
7096 				got_object_commit_close(commit);
7097 				err = got_error_from_errno("view_open");
7098 				break;
7099 			}
7100 		}
7101 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7102 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7103 		got_object_commit_close(commit);
7104 		if (err)
7105 			break;
7106 		s->last_diffed_line = s->first_displayed_line - 1 +
7107 		    s->selected_line;
7108 		if (*new_view)
7109 			break;	/* still open from active diff view */
7110 		if (view_is_parent_view(view) &&
7111 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7112 			err = view_init_hsplit(view, begin_y);
7113 			if (err)
7114 				break;
7115 		}
7116 
7117 		view->focussed = 0;
7118 		diff_view->focussed = 1;
7119 		diff_view->mode = view->mode;
7120 		diff_view->nlines = view->lines - begin_y;
7121 		if (view_is_parent_view(view)) {
7122 			view_transfer_size(diff_view, view);
7123 			err = view_close_child(view);
7124 			if (err)
7125 				break;
7126 			err = view_set_child(view, diff_view);
7127 			if (err)
7128 				break;
7129 			view->focus_child = 1;
7130 		} else
7131 			*new_view = diff_view;
7132 		if (err)
7133 			break;
7134 		break;
7135 	}
7136 	case CTRL('d'):
7137 	case 'd':
7138 		nscroll /= 2;
7139 		/* FALL THROUGH */
7140 	case KEY_NPAGE:
7141 	case CTRL('f'):
7142 	case 'f':
7143 	case ' ':
7144 		if (s->last_displayed_line >= s->blame.nlines &&
7145 		    s->selected_line >= MIN(s->blame.nlines,
7146 		    view->nlines - 2)) {
7147 			view->count = 0;
7148 			break;
7149 		}
7150 		if (s->last_displayed_line >= s->blame.nlines &&
7151 		    s->selected_line < view->nlines - 2) {
7152 			s->selected_line +=
7153 			    MIN(nscroll, s->last_displayed_line -
7154 			    s->first_displayed_line - s->selected_line + 1);
7155 		}
7156 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7157 			s->first_displayed_line += nscroll;
7158 		else
7159 			s->first_displayed_line =
7160 			    s->blame.nlines - (view->nlines - 3);
7161 		break;
7162 	case KEY_RESIZE:
7163 		if (s->selected_line > view->nlines - 2) {
7164 			s->selected_line = MIN(s->blame.nlines,
7165 			    view->nlines - 2);
7166 		}
7167 		break;
7168 	default:
7169 		view->count = 0;
7170 		break;
7171 	}
7172 	return thread_err ? thread_err : err;
7173 }
7174 
7175 static const struct got_error *
7176 reset_blame_view(struct tog_view *view)
7177 {
7178 	const struct got_error *err;
7179 	struct tog_blame_view_state *s = &view->state.blame;
7180 
7181 	view->count = 0;
7182 	s->done = 1;
7183 	err = stop_blame(&s->blame);
7184 	s->done = 0;
7185 	if (err)
7186 		return err;
7187 	return run_blame(view);
7188 }
7189 
7190 static const struct got_error *
7191 cmd_blame(int argc, char *argv[])
7192 {
7193 	const struct got_error *error;
7194 	struct got_repository *repo = NULL;
7195 	struct got_worktree *worktree = NULL;
7196 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7197 	char *link_target = NULL;
7198 	struct got_object_id *commit_id = NULL;
7199 	struct got_commit_object *commit = NULL;
7200 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7201 	int ch;
7202 	struct tog_view *view = NULL;
7203 	int *pack_fds = NULL;
7204 
7205 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7206 		switch (ch) {
7207 		case 'c':
7208 			commit_id_str = optarg;
7209 			break;
7210 		case 'r':
7211 			repo_path = realpath(optarg, NULL);
7212 			if (repo_path == NULL)
7213 				return got_error_from_errno2("realpath",
7214 				    optarg);
7215 			break;
7216 		default:
7217 			usage_blame();
7218 			/* NOTREACHED */
7219 		}
7220 	}
7221 
7222 	argc -= optind;
7223 	argv += optind;
7224 
7225 	if (argc != 1)
7226 		usage_blame();
7227 
7228 	error = got_repo_pack_fds_open(&pack_fds);
7229 	if (error != NULL)
7230 		goto done;
7231 
7232 	if (repo_path == NULL) {
7233 		cwd = getcwd(NULL, 0);
7234 		if (cwd == NULL)
7235 			return got_error_from_errno("getcwd");
7236 		error = got_worktree_open(&worktree, cwd, NULL);
7237 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7238 			goto done;
7239 		if (worktree)
7240 			repo_path =
7241 			    strdup(got_worktree_get_repo_path(worktree));
7242 		else
7243 			repo_path = strdup(cwd);
7244 		if (repo_path == NULL) {
7245 			error = got_error_from_errno("strdup");
7246 			goto done;
7247 		}
7248 	}
7249 
7250 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7251 	if (error != NULL)
7252 		goto done;
7253 
7254 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7255 	    worktree);
7256 	if (error)
7257 		goto done;
7258 
7259 	init_curses();
7260 
7261 	error = apply_unveil(got_repo_get_path(repo), NULL);
7262 	if (error)
7263 		goto done;
7264 
7265 	error = tog_load_refs(repo, 0);
7266 	if (error)
7267 		goto done;
7268 
7269 	if (commit_id_str == NULL) {
7270 		struct got_reference *head_ref;
7271 		error = got_ref_open(&head_ref, repo, worktree ?
7272 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7273 		if (error != NULL)
7274 			goto done;
7275 		error = got_ref_resolve(&commit_id, repo, head_ref);
7276 		got_ref_close(head_ref);
7277 	} else {
7278 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7279 		    repo, worktree);
7280 		if (error != NULL)
7281 			goto done;
7282 		if (keyword_idstr != NULL)
7283 			commit_id_str = keyword_idstr;
7284 
7285 		error = got_repo_match_object_id(&commit_id, NULL,
7286 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7287 	}
7288 	if (error != NULL)
7289 		goto done;
7290 
7291 	error = got_object_open_as_commit(&commit, repo, commit_id);
7292 	if (error)
7293 		goto done;
7294 
7295 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7296 	    commit, repo);
7297 	if (error)
7298 		goto done;
7299 
7300 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7301 	if (view == NULL) {
7302 		error = got_error_from_errno("view_open");
7303 		goto done;
7304 	}
7305 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7306 	    commit_id, repo);
7307 	if (error != NULL) {
7308 		if (view->close == NULL)
7309 			close_blame_view(view);
7310 		view_close(view);
7311 		goto done;
7312 	}
7313 
7314 	if (worktree) {
7315 		error = set_tog_base_commit(repo, worktree);
7316 		if (error != NULL)
7317 			goto done;
7318 
7319 		/* Release work tree lock. */
7320 		got_worktree_close(worktree);
7321 		worktree = NULL;
7322 	}
7323 
7324 	error = view_loop(view);
7325 
7326 done:
7327 	free(tog_base_commit.id);
7328 	free(repo_path);
7329 	free(in_repo_path);
7330 	free(link_target);
7331 	free(cwd);
7332 	free(commit_id);
7333 	free(keyword_idstr);
7334 	if (commit)
7335 		got_object_commit_close(commit);
7336 	if (worktree)
7337 		got_worktree_close(worktree);
7338 	if (repo) {
7339 		const struct got_error *close_err = got_repo_close(repo);
7340 		if (error == NULL)
7341 			error = close_err;
7342 	}
7343 	if (pack_fds) {
7344 		const struct got_error *pack_err =
7345 		    got_repo_pack_fds_close(pack_fds);
7346 		if (error == NULL)
7347 			error = pack_err;
7348 	}
7349 	tog_free_refs();
7350 	return error;
7351 }
7352 
7353 static const struct got_error *
7354 draw_tree_entries(struct tog_view *view, const char *parent_path)
7355 {
7356 	struct tog_tree_view_state *s = &view->state.tree;
7357 	const struct got_error *err = NULL;
7358 	struct got_tree_entry *te;
7359 	wchar_t *wline;
7360 	char *index = NULL;
7361 	struct tog_color *tc;
7362 	int width, n, nentries, scrollx, i = 1;
7363 	int limit = view->nlines;
7364 
7365 	s->ndisplayed = 0;
7366 	if (view_is_hsplit_top(view))
7367 		--limit;  /* border */
7368 
7369 	werase(view->window);
7370 
7371 	if (limit == 0)
7372 		return NULL;
7373 
7374 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7375 	    0, 0);
7376 	if (err)
7377 		return err;
7378 	if (view_needs_focus_indication(view))
7379 		wstandout(view->window);
7380 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7381 	if (tc)
7382 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7383 	waddwstr(view->window, wline);
7384 	free(wline);
7385 	wline = NULL;
7386 	while (width++ < view->ncols)
7387 		waddch(view->window, ' ');
7388 	if (tc)
7389 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7390 	if (view_needs_focus_indication(view))
7391 		wstandend(view->window);
7392 	if (--limit <= 0)
7393 		return NULL;
7394 
7395 	i += s->selected;
7396 	if (s->first_displayed_entry) {
7397 		i += got_tree_entry_get_index(s->first_displayed_entry);
7398 		if (s->tree != s->root)
7399 			++i;  /* account for ".." entry */
7400 	}
7401 	nentries = got_object_tree_get_nentries(s->tree);
7402 	if (asprintf(&index, "[%d/%d] %s",
7403 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7404 		return got_error_from_errno("asprintf");
7405 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7406 	free(index);
7407 	if (err)
7408 		return err;
7409 	waddwstr(view->window, wline);
7410 	free(wline);
7411 	wline = NULL;
7412 	if (width < view->ncols - 1)
7413 		waddch(view->window, '\n');
7414 	if (--limit <= 0)
7415 		return NULL;
7416 	waddch(view->window, '\n');
7417 	if (--limit <= 0)
7418 		return NULL;
7419 
7420 	if (s->first_displayed_entry == NULL) {
7421 		te = got_object_tree_get_first_entry(s->tree);
7422 		if (s->selected == 0) {
7423 			if (view->focussed)
7424 				wstandout(view->window);
7425 			s->selected_entry = NULL;
7426 		}
7427 		waddstr(view->window, "  ..\n");	/* parent directory */
7428 		if (s->selected == 0 && view->focussed)
7429 			wstandend(view->window);
7430 		s->ndisplayed++;
7431 		if (--limit <= 0)
7432 			return NULL;
7433 		n = 1;
7434 	} else {
7435 		n = 0;
7436 		te = s->first_displayed_entry;
7437 	}
7438 
7439 	view->maxx = 0;
7440 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7441 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7442 		const char *modestr = "";
7443 		mode_t mode;
7444 
7445 		te = got_object_tree_get_entry(s->tree, i);
7446 		mode = got_tree_entry_get_mode(te);
7447 
7448 		if (s->show_ids) {
7449 			err = got_object_id_str(&id_str,
7450 			    got_tree_entry_get_id(te));
7451 			if (err)
7452 				return got_error_from_errno(
7453 				    "got_object_id_str");
7454 		}
7455 		if (got_object_tree_entry_is_submodule(te))
7456 			modestr = "$";
7457 		else if (S_ISLNK(mode)) {
7458 			int i;
7459 
7460 			err = got_tree_entry_get_symlink_target(&link_target,
7461 			    te, s->repo);
7462 			if (err) {
7463 				free(id_str);
7464 				return err;
7465 			}
7466 			for (i = 0; link_target[i] != '\0'; i++) {
7467 				if (!isprint((unsigned char)link_target[i]))
7468 					link_target[i] = '?';
7469 			}
7470 			modestr = "@";
7471 		}
7472 		else if (S_ISDIR(mode))
7473 			modestr = "/";
7474 		else if (mode & S_IXUSR)
7475 			modestr = "*";
7476 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7477 		    got_tree_entry_get_name(te), modestr,
7478 		    link_target ? " -> ": "",
7479 		    link_target ? link_target : "") == -1) {
7480 			free(id_str);
7481 			free(link_target);
7482 			return got_error_from_errno("asprintf");
7483 		}
7484 		free(id_str);
7485 		free(link_target);
7486 
7487 		/* use full line width to determine view->maxx */
7488 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7489 		if (err) {
7490 			free(line);
7491 			break;
7492 		}
7493 		view->maxx = MAX(view->maxx, width);
7494 		free(wline);
7495 		wline = NULL;
7496 
7497 		err = format_line(&wline, &width, &scrollx, line, view->x,
7498 		    view->ncols, 0, 0);
7499 		if (err) {
7500 			free(line);
7501 			break;
7502 		}
7503 		if (n == s->selected) {
7504 			if (view->focussed)
7505 				wstandout(view->window);
7506 			s->selected_entry = te;
7507 		}
7508 		tc = match_color(&s->colors, line);
7509 		if (tc)
7510 			wattr_on(view->window,
7511 			    COLOR_PAIR(tc->colorpair), NULL);
7512 		waddwstr(view->window, &wline[scrollx]);
7513 		if (tc)
7514 			wattr_off(view->window,
7515 			    COLOR_PAIR(tc->colorpair), NULL);
7516 		if (width < view->ncols)
7517 			waddch(view->window, '\n');
7518 		if (n == s->selected && view->focussed)
7519 			wstandend(view->window);
7520 		free(line);
7521 		free(wline);
7522 		wline = NULL;
7523 		n++;
7524 		s->ndisplayed++;
7525 		s->last_displayed_entry = te;
7526 		if (--limit <= 0)
7527 			break;
7528 	}
7529 
7530 	return err;
7531 }
7532 
7533 static void
7534 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7535 {
7536 	struct got_tree_entry *te;
7537 	int isroot = s->tree == s->root;
7538 	int i = 0;
7539 
7540 	if (s->first_displayed_entry == NULL)
7541 		return;
7542 
7543 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7544 	while (i++ < maxscroll) {
7545 		if (te == NULL) {
7546 			if (!isroot)
7547 				s->first_displayed_entry = NULL;
7548 			break;
7549 		}
7550 		s->first_displayed_entry = te;
7551 		te = got_tree_entry_get_prev(s->tree, te);
7552 	}
7553 }
7554 
7555 static const struct got_error *
7556 tree_scroll_down(struct tog_view *view, int maxscroll)
7557 {
7558 	struct tog_tree_view_state *s = &view->state.tree;
7559 	struct got_tree_entry *next, *last;
7560 	int n = 0;
7561 
7562 	if (s->first_displayed_entry)
7563 		next = got_tree_entry_get_next(s->tree,
7564 		    s->first_displayed_entry);
7565 	else
7566 		next = got_object_tree_get_first_entry(s->tree);
7567 
7568 	last = s->last_displayed_entry;
7569 	while (next && n++ < maxscroll) {
7570 		if (last) {
7571 			s->last_displayed_entry = last;
7572 			last = got_tree_entry_get_next(s->tree, last);
7573 		}
7574 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7575 			s->first_displayed_entry = next;
7576 			next = got_tree_entry_get_next(s->tree, next);
7577 		}
7578 	}
7579 
7580 	return NULL;
7581 }
7582 
7583 static const struct got_error *
7584 tree_entry_path(char **path, struct tog_parent_trees *parents,
7585     struct got_tree_entry *te)
7586 {
7587 	const struct got_error *err = NULL;
7588 	struct tog_parent_tree *pt;
7589 	size_t len = 2; /* for leading slash and NUL */
7590 
7591 	TAILQ_FOREACH(pt, parents, entry)
7592 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7593 		    + 1 /* slash */;
7594 	if (te)
7595 		len += strlen(got_tree_entry_get_name(te));
7596 
7597 	*path = calloc(1, len);
7598 	if (path == NULL)
7599 		return got_error_from_errno("calloc");
7600 
7601 	(*path)[0] = '/';
7602 	pt = TAILQ_LAST(parents, tog_parent_trees);
7603 	while (pt) {
7604 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7605 		if (strlcat(*path, name, len) >= len) {
7606 			err = got_error(GOT_ERR_NO_SPACE);
7607 			goto done;
7608 		}
7609 		if (strlcat(*path, "/", len) >= len) {
7610 			err = got_error(GOT_ERR_NO_SPACE);
7611 			goto done;
7612 		}
7613 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7614 	}
7615 	if (te) {
7616 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7617 			err = got_error(GOT_ERR_NO_SPACE);
7618 			goto done;
7619 		}
7620 	}
7621 done:
7622 	if (err) {
7623 		free(*path);
7624 		*path = NULL;
7625 	}
7626 	return err;
7627 }
7628 
7629 static const struct got_error *
7630 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7631     struct got_tree_entry *te, struct tog_parent_trees *parents,
7632     struct got_object_id *commit_id, struct got_repository *repo)
7633 {
7634 	const struct got_error *err = NULL;
7635 	char *path;
7636 	struct tog_view *blame_view;
7637 
7638 	*new_view = NULL;
7639 
7640 	err = tree_entry_path(&path, parents, te);
7641 	if (err)
7642 		return err;
7643 
7644 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7645 	if (blame_view == NULL) {
7646 		err = got_error_from_errno("view_open");
7647 		goto done;
7648 	}
7649 
7650 	err = open_blame_view(blame_view, path, commit_id, repo);
7651 	if (err) {
7652 		if (err->code == GOT_ERR_CANCELLED)
7653 			err = NULL;
7654 		view_close(blame_view);
7655 	} else
7656 		*new_view = blame_view;
7657 done:
7658 	free(path);
7659 	return err;
7660 }
7661 
7662 static const struct got_error *
7663 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7664     struct tog_tree_view_state *s)
7665 {
7666 	struct tog_view *log_view;
7667 	const struct got_error *err = NULL;
7668 	char *path;
7669 
7670 	*new_view = NULL;
7671 
7672 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7673 	if (log_view == NULL)
7674 		return got_error_from_errno("view_open");
7675 
7676 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7677 	if (err)
7678 		return err;
7679 
7680 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7681 	    path, 0, NULL);
7682 	if (err)
7683 		view_close(log_view);
7684 	else
7685 		*new_view = log_view;
7686 	free(path);
7687 	return err;
7688 }
7689 
7690 static const struct got_error *
7691 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7692     const char *head_ref_name, struct got_repository *repo)
7693 {
7694 	const struct got_error *err = NULL;
7695 	char *commit_id_str = NULL;
7696 	struct tog_tree_view_state *s = &view->state.tree;
7697 	struct got_commit_object *commit = NULL;
7698 
7699 	TAILQ_INIT(&s->parents);
7700 	STAILQ_INIT(&s->colors);
7701 
7702 	s->commit_id = got_object_id_dup(commit_id);
7703 	if (s->commit_id == NULL) {
7704 		err = got_error_from_errno("got_object_id_dup");
7705 		goto done;
7706 	}
7707 
7708 	err = got_object_open_as_commit(&commit, repo, commit_id);
7709 	if (err)
7710 		goto done;
7711 
7712 	/*
7713 	 * The root is opened here and will be closed when the view is closed.
7714 	 * Any visited subtrees and their path-wise parents are opened and
7715 	 * closed on demand.
7716 	 */
7717 	err = got_object_open_as_tree(&s->root, repo,
7718 	    got_object_commit_get_tree_id(commit));
7719 	if (err)
7720 		goto done;
7721 	s->tree = s->root;
7722 
7723 	err = got_object_id_str(&commit_id_str, commit_id);
7724 	if (err != NULL)
7725 		goto done;
7726 
7727 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7728 		err = got_error_from_errno("asprintf");
7729 		goto done;
7730 	}
7731 
7732 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7733 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7734 	if (head_ref_name) {
7735 		s->head_ref_name = strdup(head_ref_name);
7736 		if (s->head_ref_name == NULL) {
7737 			err = got_error_from_errno("strdup");
7738 			goto done;
7739 		}
7740 	}
7741 	s->repo = repo;
7742 
7743 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7744 		err = add_color(&s->colors, "\\$$",
7745 		    TOG_COLOR_TREE_SUBMODULE,
7746 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7747 		if (err)
7748 			goto done;
7749 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7750 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7751 		if (err)
7752 			goto done;
7753 		err = add_color(&s->colors, "/$",
7754 		    TOG_COLOR_TREE_DIRECTORY,
7755 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7756 		if (err)
7757 			goto done;
7758 
7759 		err = add_color(&s->colors, "\\*$",
7760 		    TOG_COLOR_TREE_EXECUTABLE,
7761 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7762 		if (err)
7763 			goto done;
7764 
7765 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7766 		    get_color_value("TOG_COLOR_COMMIT"));
7767 		if (err)
7768 			goto done;
7769 	}
7770 
7771 	view->show = show_tree_view;
7772 	view->input = input_tree_view;
7773 	view->close = close_tree_view;
7774 	view->search_start = search_start_tree_view;
7775 	view->search_next = search_next_tree_view;
7776 done:
7777 	free(commit_id_str);
7778 	if (commit)
7779 		got_object_commit_close(commit);
7780 	if (err) {
7781 		if (view->close == NULL)
7782 			close_tree_view(view);
7783 		view_close(view);
7784 	}
7785 	return err;
7786 }
7787 
7788 static const struct got_error *
7789 close_tree_view(struct tog_view *view)
7790 {
7791 	struct tog_tree_view_state *s = &view->state.tree;
7792 
7793 	free_colors(&s->colors);
7794 	free(s->tree_label);
7795 	s->tree_label = NULL;
7796 	free(s->commit_id);
7797 	s->commit_id = NULL;
7798 	free(s->head_ref_name);
7799 	s->head_ref_name = NULL;
7800 	while (!TAILQ_EMPTY(&s->parents)) {
7801 		struct tog_parent_tree *parent;
7802 		parent = TAILQ_FIRST(&s->parents);
7803 		TAILQ_REMOVE(&s->parents, parent, entry);
7804 		if (parent->tree != s->root)
7805 			got_object_tree_close(parent->tree);
7806 		free(parent);
7807 
7808 	}
7809 	if (s->tree != NULL && s->tree != s->root)
7810 		got_object_tree_close(s->tree);
7811 	if (s->root)
7812 		got_object_tree_close(s->root);
7813 	return NULL;
7814 }
7815 
7816 static const struct got_error *
7817 search_start_tree_view(struct tog_view *view)
7818 {
7819 	struct tog_tree_view_state *s = &view->state.tree;
7820 
7821 	s->matched_entry = NULL;
7822 	return NULL;
7823 }
7824 
7825 static int
7826 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7827 {
7828 	regmatch_t regmatch;
7829 
7830 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7831 	    0) == 0;
7832 }
7833 
7834 static const struct got_error *
7835 search_next_tree_view(struct tog_view *view)
7836 {
7837 	struct tog_tree_view_state *s = &view->state.tree;
7838 	struct got_tree_entry *te = NULL;
7839 
7840 	if (!view->searching) {
7841 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7842 		return NULL;
7843 	}
7844 
7845 	if (s->matched_entry) {
7846 		if (view->searching == TOG_SEARCH_FORWARD) {
7847 			if (s->selected_entry)
7848 				te = got_tree_entry_get_next(s->tree,
7849 				    s->selected_entry);
7850 			else
7851 				te = got_object_tree_get_first_entry(s->tree);
7852 		} else {
7853 			if (s->selected_entry == NULL)
7854 				te = got_object_tree_get_last_entry(s->tree);
7855 			else
7856 				te = got_tree_entry_get_prev(s->tree,
7857 				    s->selected_entry);
7858 		}
7859 	} else {
7860 		if (s->selected_entry)
7861 			te = s->selected_entry;
7862 		else if (view->searching == TOG_SEARCH_FORWARD)
7863 			te = got_object_tree_get_first_entry(s->tree);
7864 		else
7865 			te = got_object_tree_get_last_entry(s->tree);
7866 	}
7867 
7868 	while (1) {
7869 		if (te == NULL) {
7870 			if (s->matched_entry == NULL) {
7871 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7872 				return NULL;
7873 			}
7874 			if (view->searching == TOG_SEARCH_FORWARD)
7875 				te = got_object_tree_get_first_entry(s->tree);
7876 			else
7877 				te = got_object_tree_get_last_entry(s->tree);
7878 		}
7879 
7880 		if (match_tree_entry(te, &view->regex)) {
7881 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7882 			s->matched_entry = te;
7883 			break;
7884 		}
7885 
7886 		if (view->searching == TOG_SEARCH_FORWARD)
7887 			te = got_tree_entry_get_next(s->tree, te);
7888 		else
7889 			te = got_tree_entry_get_prev(s->tree, te);
7890 	}
7891 
7892 	if (s->matched_entry) {
7893 		s->first_displayed_entry = s->matched_entry;
7894 		s->selected = 0;
7895 	}
7896 
7897 	return NULL;
7898 }
7899 
7900 static const struct got_error *
7901 show_tree_view(struct tog_view *view)
7902 {
7903 	const struct got_error *err = NULL;
7904 	struct tog_tree_view_state *s = &view->state.tree;
7905 	char *parent_path;
7906 
7907 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7908 	if (err)
7909 		return err;
7910 
7911 	err = draw_tree_entries(view, parent_path);
7912 	free(parent_path);
7913 
7914 	view_border(view);
7915 	return err;
7916 }
7917 
7918 static const struct got_error *
7919 tree_goto_line(struct tog_view *view, int nlines)
7920 {
7921 	const struct got_error		 *err = NULL;
7922 	struct tog_tree_view_state	 *s = &view->state.tree;
7923 	struct got_tree_entry		**fte, **lte, **ste;
7924 	int				  g, last, first = 1, i = 1;
7925 	int				  root = s->tree == s->root;
7926 	int				  off = root ? 1 : 2;
7927 
7928 	g = view->gline;
7929 	view->gline = 0;
7930 
7931 	if (g == 0)
7932 		g = 1;
7933 	else if (g > got_object_tree_get_nentries(s->tree))
7934 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7935 
7936 	fte = &s->first_displayed_entry;
7937 	lte = &s->last_displayed_entry;
7938 	ste = &s->selected_entry;
7939 
7940 	if (*fte != NULL) {
7941 		first = got_tree_entry_get_index(*fte);
7942 		first += off;  /* account for ".." */
7943 	}
7944 	last = got_tree_entry_get_index(*lte);
7945 	last += off;
7946 
7947 	if (g >= first && g <= last && g - first < nlines) {
7948 		s->selected = g - first;
7949 		return NULL;	/* gline is on the current page */
7950 	}
7951 
7952 	if (*ste != NULL) {
7953 		i = got_tree_entry_get_index(*ste);
7954 		i += off;
7955 	}
7956 
7957 	if (i < g) {
7958 		err = tree_scroll_down(view, g - i);
7959 		if (err)
7960 			return err;
7961 		if (got_tree_entry_get_index(*lte) >=
7962 		    got_object_tree_get_nentries(s->tree) - 1 &&
7963 		    first + s->selected < g &&
7964 		    s->selected < s->ndisplayed - 1) {
7965 			first = got_tree_entry_get_index(*fte);
7966 			first += off;
7967 			s->selected = g - first;
7968 		}
7969 	} else if (i > g)
7970 		tree_scroll_up(s, i - g);
7971 
7972 	if (g < nlines &&
7973 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7974 		s->selected = g - 1;
7975 
7976 	return NULL;
7977 }
7978 
7979 static const struct got_error *
7980 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7981 {
7982 	const struct got_error *err = NULL;
7983 	struct tog_tree_view_state *s = &view->state.tree;
7984 	struct got_tree_entry *te;
7985 	int n, nscroll = view->nlines - 3;
7986 
7987 	if (view->gline)
7988 		return tree_goto_line(view, nscroll);
7989 
7990 	switch (ch) {
7991 	case '0':
7992 	case '$':
7993 	case KEY_RIGHT:
7994 	case 'l':
7995 	case KEY_LEFT:
7996 	case 'h':
7997 		horizontal_scroll_input(view, ch);
7998 		break;
7999 	case 'i':
8000 		s->show_ids = !s->show_ids;
8001 		view->count = 0;
8002 		break;
8003 	case 'L':
8004 		view->count = 0;
8005 		if (!s->selected_entry)
8006 			break;
8007 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8008 		break;
8009 	case 'R':
8010 		view->count = 0;
8011 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8012 		break;
8013 	case 'g':
8014 	case '=':
8015 	case KEY_HOME:
8016 		s->selected = 0;
8017 		view->count = 0;
8018 		if (s->tree == s->root)
8019 			s->first_displayed_entry =
8020 			    got_object_tree_get_first_entry(s->tree);
8021 		else
8022 			s->first_displayed_entry = NULL;
8023 		break;
8024 	case 'G':
8025 	case '*':
8026 	case KEY_END: {
8027 		int eos = view->nlines - 3;
8028 
8029 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8030 			--eos;  /* border */
8031 		s->selected = 0;
8032 		view->count = 0;
8033 		te = got_object_tree_get_last_entry(s->tree);
8034 		for (n = 0; n < eos; n++) {
8035 			if (te == NULL) {
8036 				if (s->tree != s->root) {
8037 					s->first_displayed_entry = NULL;
8038 					n++;
8039 				}
8040 				break;
8041 			}
8042 			s->first_displayed_entry = te;
8043 			te = got_tree_entry_get_prev(s->tree, te);
8044 		}
8045 		if (n > 0)
8046 			s->selected = n - 1;
8047 		break;
8048 	}
8049 	case 'k':
8050 	case KEY_UP:
8051 	case CTRL('p'):
8052 		if (s->selected > 0) {
8053 			s->selected--;
8054 			break;
8055 		}
8056 		tree_scroll_up(s, 1);
8057 		if (s->selected_entry == NULL ||
8058 		    (s->tree == s->root && s->selected_entry ==
8059 		     got_object_tree_get_first_entry(s->tree)))
8060 			view->count = 0;
8061 		break;
8062 	case CTRL('u'):
8063 	case 'u':
8064 		nscroll /= 2;
8065 		/* FALL THROUGH */
8066 	case KEY_PPAGE:
8067 	case CTRL('b'):
8068 	case 'b':
8069 		if (s->tree == s->root) {
8070 			if (got_object_tree_get_first_entry(s->tree) ==
8071 			    s->first_displayed_entry)
8072 				s->selected -= MIN(s->selected, nscroll);
8073 		} else {
8074 			if (s->first_displayed_entry == NULL)
8075 				s->selected -= MIN(s->selected, nscroll);
8076 		}
8077 		tree_scroll_up(s, MAX(0, nscroll));
8078 		if (s->selected_entry == NULL ||
8079 		    (s->tree == s->root && s->selected_entry ==
8080 		     got_object_tree_get_first_entry(s->tree)))
8081 			view->count = 0;
8082 		break;
8083 	case 'j':
8084 	case KEY_DOWN:
8085 	case CTRL('n'):
8086 		if (s->selected < s->ndisplayed - 1) {
8087 			s->selected++;
8088 			break;
8089 		}
8090 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8091 		    == NULL) {
8092 			/* can't scroll any further */
8093 			view->count = 0;
8094 			break;
8095 		}
8096 		tree_scroll_down(view, 1);
8097 		break;
8098 	case CTRL('d'):
8099 	case 'd':
8100 		nscroll /= 2;
8101 		/* FALL THROUGH */
8102 	case KEY_NPAGE:
8103 	case CTRL('f'):
8104 	case 'f':
8105 	case ' ':
8106 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8107 		    == NULL) {
8108 			/* can't scroll any further; move cursor down */
8109 			if (s->selected < s->ndisplayed - 1)
8110 				s->selected += MIN(nscroll,
8111 				    s->ndisplayed - s->selected - 1);
8112 			else
8113 				view->count = 0;
8114 			break;
8115 		}
8116 		tree_scroll_down(view, nscroll);
8117 		break;
8118 	case KEY_ENTER:
8119 	case '\r':
8120 	case KEY_BACKSPACE:
8121 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8122 			struct tog_parent_tree *parent;
8123 			/* user selected '..' */
8124 			if (s->tree == s->root) {
8125 				view->count = 0;
8126 				break;
8127 			}
8128 			parent = TAILQ_FIRST(&s->parents);
8129 			TAILQ_REMOVE(&s->parents, parent,
8130 			    entry);
8131 			got_object_tree_close(s->tree);
8132 			s->tree = parent->tree;
8133 			s->first_displayed_entry =
8134 			    parent->first_displayed_entry;
8135 			s->selected_entry =
8136 			    parent->selected_entry;
8137 			s->selected = parent->selected;
8138 			if (s->selected > view->nlines - 3) {
8139 				err = offset_selection_down(view);
8140 				if (err)
8141 					break;
8142 			}
8143 			free(parent);
8144 		} else if (S_ISDIR(got_tree_entry_get_mode(
8145 		    s->selected_entry))) {
8146 			struct got_tree_object *subtree;
8147 			view->count = 0;
8148 			err = got_object_open_as_tree(&subtree, s->repo,
8149 			    got_tree_entry_get_id(s->selected_entry));
8150 			if (err)
8151 				break;
8152 			err = tree_view_visit_subtree(s, subtree);
8153 			if (err) {
8154 				got_object_tree_close(subtree);
8155 				break;
8156 			}
8157 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8158 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8159 		break;
8160 	case KEY_RESIZE:
8161 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8162 			s->selected = view->nlines - 4;
8163 		view->count = 0;
8164 		break;
8165 	default:
8166 		view->count = 0;
8167 		break;
8168 	}
8169 
8170 	return err;
8171 }
8172 
8173 __dead static void
8174 usage_tree(void)
8175 {
8176 	endwin();
8177 	fprintf(stderr,
8178 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8179 	    getprogname());
8180 	exit(1);
8181 }
8182 
8183 static const struct got_error *
8184 cmd_tree(int argc, char *argv[])
8185 {
8186 	const struct got_error *error;
8187 	struct got_repository *repo = NULL;
8188 	struct got_worktree *worktree = NULL;
8189 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8190 	struct got_object_id *commit_id = NULL;
8191 	struct got_commit_object *commit = NULL;
8192 	const char *commit_id_arg = NULL;
8193 	char *keyword_idstr = NULL, *label = NULL;
8194 	struct got_reference *ref = NULL;
8195 	const char *head_ref_name = NULL;
8196 	int ch;
8197 	struct tog_view *view;
8198 	int *pack_fds = NULL;
8199 
8200 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8201 		switch (ch) {
8202 		case 'c':
8203 			commit_id_arg = optarg;
8204 			break;
8205 		case 'r':
8206 			repo_path = realpath(optarg, NULL);
8207 			if (repo_path == NULL)
8208 				return got_error_from_errno2("realpath",
8209 				    optarg);
8210 			break;
8211 		default:
8212 			usage_tree();
8213 			/* NOTREACHED */
8214 		}
8215 	}
8216 
8217 	argc -= optind;
8218 	argv += optind;
8219 
8220 	if (argc > 1)
8221 		usage_tree();
8222 
8223 	error = got_repo_pack_fds_open(&pack_fds);
8224 	if (error != NULL)
8225 		goto done;
8226 
8227 	if (repo_path == NULL) {
8228 		cwd = getcwd(NULL, 0);
8229 		if (cwd == NULL)
8230 			return got_error_from_errno("getcwd");
8231 		error = got_worktree_open(&worktree, cwd, NULL);
8232 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8233 			goto done;
8234 		if (worktree)
8235 			repo_path =
8236 			    strdup(got_worktree_get_repo_path(worktree));
8237 		else
8238 			repo_path = strdup(cwd);
8239 		if (repo_path == NULL) {
8240 			error = got_error_from_errno("strdup");
8241 			goto done;
8242 		}
8243 	}
8244 
8245 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8246 	if (error != NULL)
8247 		goto done;
8248 
8249 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8250 	    repo, worktree);
8251 	if (error)
8252 		goto done;
8253 
8254 	init_curses();
8255 
8256 	error = apply_unveil(got_repo_get_path(repo), NULL);
8257 	if (error)
8258 		goto done;
8259 
8260 	error = tog_load_refs(repo, 0);
8261 	if (error)
8262 		goto done;
8263 
8264 	if (commit_id_arg == NULL) {
8265 		error = got_repo_match_object_id(&commit_id, &label,
8266 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8267 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8268 		if (error)
8269 			goto done;
8270 		head_ref_name = label;
8271 	} else {
8272 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8273 		    repo, worktree);
8274 		if (error != NULL)
8275 			goto done;
8276 		if (keyword_idstr != NULL)
8277 			commit_id_arg = keyword_idstr;
8278 
8279 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8280 		if (error == NULL)
8281 			head_ref_name = got_ref_get_name(ref);
8282 		else if (error->code != GOT_ERR_NOT_REF)
8283 			goto done;
8284 		error = got_repo_match_object_id(&commit_id, NULL,
8285 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8286 		if (error)
8287 			goto done;
8288 	}
8289 
8290 	error = got_object_open_as_commit(&commit, repo, commit_id);
8291 	if (error)
8292 		goto done;
8293 
8294 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8295 	if (view == NULL) {
8296 		error = got_error_from_errno("view_open");
8297 		goto done;
8298 	}
8299 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8300 	if (error)
8301 		goto done;
8302 	if (!got_path_is_root_dir(in_repo_path)) {
8303 		error = tree_view_walk_path(&view->state.tree, commit,
8304 		    in_repo_path);
8305 		if (error)
8306 			goto done;
8307 	}
8308 
8309 	if (worktree) {
8310 		error = set_tog_base_commit(repo, worktree);
8311 		if (error != NULL)
8312 			goto done;
8313 
8314 		/* Release work tree lock. */
8315 		got_worktree_close(worktree);
8316 		worktree = NULL;
8317 	}
8318 
8319 	error = view_loop(view);
8320 
8321 done:
8322 	free(tog_base_commit.id);
8323 	free(keyword_idstr);
8324 	free(repo_path);
8325 	free(cwd);
8326 	free(commit_id);
8327 	free(label);
8328 	if (ref)
8329 		got_ref_close(ref);
8330 	if (worktree != NULL)
8331 		got_worktree_close(worktree);
8332 	if (repo) {
8333 		const struct got_error *close_err = got_repo_close(repo);
8334 		if (error == NULL)
8335 			error = close_err;
8336 	}
8337 	if (pack_fds) {
8338 		const struct got_error *pack_err =
8339 		    got_repo_pack_fds_close(pack_fds);
8340 		if (error == NULL)
8341 			error = pack_err;
8342 	}
8343 	tog_free_refs();
8344 	return error;
8345 }
8346 
8347 static const struct got_error *
8348 ref_view_load_refs(struct tog_ref_view_state *s)
8349 {
8350 	struct got_reflist_entry *sre;
8351 	struct tog_reflist_entry *re;
8352 
8353 	s->nrefs = 0;
8354 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8355 		if (strncmp(got_ref_get_name(sre->ref),
8356 		    "refs/got/", 9) == 0 &&
8357 		    strncmp(got_ref_get_name(sre->ref),
8358 		    "refs/got/backup/", 16) != 0)
8359 			continue;
8360 
8361 		re = malloc(sizeof(*re));
8362 		if (re == NULL)
8363 			return got_error_from_errno("malloc");
8364 
8365 		re->ref = got_ref_dup(sre->ref);
8366 		if (re->ref == NULL)
8367 			return got_error_from_errno("got_ref_dup");
8368 		re->idx = s->nrefs++;
8369 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8370 	}
8371 
8372 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8373 	return NULL;
8374 }
8375 
8376 static void
8377 ref_view_free_refs(struct tog_ref_view_state *s)
8378 {
8379 	struct tog_reflist_entry *re;
8380 
8381 	while (!TAILQ_EMPTY(&s->refs)) {
8382 		re = TAILQ_FIRST(&s->refs);
8383 		TAILQ_REMOVE(&s->refs, re, entry);
8384 		got_ref_close(re->ref);
8385 		free(re);
8386 	}
8387 }
8388 
8389 static const struct got_error *
8390 open_ref_view(struct tog_view *view, struct got_repository *repo)
8391 {
8392 	const struct got_error *err = NULL;
8393 	struct tog_ref_view_state *s = &view->state.ref;
8394 
8395 	s->selected_entry = 0;
8396 	s->repo = repo;
8397 
8398 	TAILQ_INIT(&s->refs);
8399 	STAILQ_INIT(&s->colors);
8400 
8401 	err = ref_view_load_refs(s);
8402 	if (err)
8403 		goto done;
8404 
8405 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8406 		err = add_color(&s->colors, "^refs/heads/",
8407 		    TOG_COLOR_REFS_HEADS,
8408 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8409 		if (err)
8410 			goto done;
8411 
8412 		err = add_color(&s->colors, "^refs/tags/",
8413 		    TOG_COLOR_REFS_TAGS,
8414 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8415 		if (err)
8416 			goto done;
8417 
8418 		err = add_color(&s->colors, "^refs/remotes/",
8419 		    TOG_COLOR_REFS_REMOTES,
8420 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8421 		if (err)
8422 			goto done;
8423 
8424 		err = add_color(&s->colors, "^refs/got/backup/",
8425 		    TOG_COLOR_REFS_BACKUP,
8426 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8427 		if (err)
8428 			goto done;
8429 	}
8430 
8431 	view->show = show_ref_view;
8432 	view->input = input_ref_view;
8433 	view->close = close_ref_view;
8434 	view->search_start = search_start_ref_view;
8435 	view->search_next = search_next_ref_view;
8436 done:
8437 	if (err) {
8438 		if (view->close == NULL)
8439 			close_ref_view(view);
8440 		view_close(view);
8441 	}
8442 	return err;
8443 }
8444 
8445 static const struct got_error *
8446 close_ref_view(struct tog_view *view)
8447 {
8448 	struct tog_ref_view_state *s = &view->state.ref;
8449 
8450 	ref_view_free_refs(s);
8451 	free_colors(&s->colors);
8452 
8453 	return NULL;
8454 }
8455 
8456 static const struct got_error *
8457 resolve_reflist_entry(struct got_object_id **commit_id,
8458     struct tog_reflist_entry *re, struct got_repository *repo)
8459 {
8460 	const struct got_error *err = NULL;
8461 	struct got_object_id *obj_id;
8462 	struct got_tag_object *tag = NULL;
8463 	int obj_type;
8464 
8465 	*commit_id = NULL;
8466 
8467 	err = got_ref_resolve(&obj_id, repo, re->ref);
8468 	if (err)
8469 		return err;
8470 
8471 	err = got_object_get_type(&obj_type, repo, obj_id);
8472 	if (err)
8473 		goto done;
8474 
8475 	switch (obj_type) {
8476 	case GOT_OBJ_TYPE_COMMIT:
8477 		*commit_id = obj_id;
8478 		break;
8479 	case GOT_OBJ_TYPE_TAG:
8480 		err = got_object_open_as_tag(&tag, repo, obj_id);
8481 		if (err)
8482 			goto done;
8483 		free(obj_id);
8484 		err = got_object_get_type(&obj_type, repo,
8485 		    got_object_tag_get_object_id(tag));
8486 		if (err)
8487 			goto done;
8488 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8489 			err = got_error(GOT_ERR_OBJ_TYPE);
8490 			goto done;
8491 		}
8492 		*commit_id = got_object_id_dup(
8493 		    got_object_tag_get_object_id(tag));
8494 		if (*commit_id == NULL) {
8495 			err = got_error_from_errno("got_object_id_dup");
8496 			goto done;
8497 		}
8498 		break;
8499 	default:
8500 		err = got_error(GOT_ERR_OBJ_TYPE);
8501 		break;
8502 	}
8503 
8504 done:
8505 	if (tag)
8506 		got_object_tag_close(tag);
8507 	if (err) {
8508 		free(*commit_id);
8509 		*commit_id = NULL;
8510 	}
8511 	return err;
8512 }
8513 
8514 static const struct got_error *
8515 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8516     struct tog_reflist_entry *re, struct got_repository *repo)
8517 {
8518 	struct tog_view *log_view;
8519 	const struct got_error *err = NULL;
8520 	struct got_object_id *commit_id = NULL;
8521 
8522 	*new_view = NULL;
8523 
8524 	err = resolve_reflist_entry(&commit_id, re, repo);
8525 	if (err) {
8526 		if (err->code != GOT_ERR_OBJ_TYPE)
8527 			return err;
8528 		else
8529 			return NULL;
8530 	}
8531 
8532 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8533 	if (log_view == NULL) {
8534 		err = got_error_from_errno("view_open");
8535 		goto done;
8536 	}
8537 
8538 	err = open_log_view(log_view, commit_id, repo,
8539 	    got_ref_get_name(re->ref), "", 0, NULL);
8540 done:
8541 	if (err)
8542 		view_close(log_view);
8543 	else
8544 		*new_view = log_view;
8545 	free(commit_id);
8546 	return err;
8547 }
8548 
8549 static void
8550 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8551 {
8552 	struct tog_reflist_entry *re;
8553 	int i = 0;
8554 
8555 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8556 		return;
8557 
8558 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8559 	while (i++ < maxscroll) {
8560 		if (re == NULL)
8561 			break;
8562 		s->first_displayed_entry = re;
8563 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8564 	}
8565 }
8566 
8567 static const struct got_error *
8568 ref_scroll_down(struct tog_view *view, int maxscroll)
8569 {
8570 	struct tog_ref_view_state *s = &view->state.ref;
8571 	struct tog_reflist_entry *next, *last;
8572 	int n = 0;
8573 
8574 	if (s->first_displayed_entry)
8575 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8576 	else
8577 		next = TAILQ_FIRST(&s->refs);
8578 
8579 	last = s->last_displayed_entry;
8580 	while (next && n++ < maxscroll) {
8581 		if (last) {
8582 			s->last_displayed_entry = last;
8583 			last = TAILQ_NEXT(last, entry);
8584 		}
8585 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8586 			s->first_displayed_entry = next;
8587 			next = TAILQ_NEXT(next, entry);
8588 		}
8589 	}
8590 
8591 	return NULL;
8592 }
8593 
8594 static const struct got_error *
8595 search_start_ref_view(struct tog_view *view)
8596 {
8597 	struct tog_ref_view_state *s = &view->state.ref;
8598 
8599 	s->matched_entry = NULL;
8600 	return NULL;
8601 }
8602 
8603 static int
8604 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8605 {
8606 	regmatch_t regmatch;
8607 
8608 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8609 	    0) == 0;
8610 }
8611 
8612 static const struct got_error *
8613 search_next_ref_view(struct tog_view *view)
8614 {
8615 	struct tog_ref_view_state *s = &view->state.ref;
8616 	struct tog_reflist_entry *re = NULL;
8617 
8618 	if (!view->searching) {
8619 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8620 		return NULL;
8621 	}
8622 
8623 	if (s->matched_entry) {
8624 		if (view->searching == TOG_SEARCH_FORWARD) {
8625 			if (s->selected_entry)
8626 				re = TAILQ_NEXT(s->selected_entry, entry);
8627 			else
8628 				re = TAILQ_PREV(s->selected_entry,
8629 				    tog_reflist_head, entry);
8630 		} else {
8631 			if (s->selected_entry == NULL)
8632 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8633 			else
8634 				re = TAILQ_PREV(s->selected_entry,
8635 				    tog_reflist_head, entry);
8636 		}
8637 	} else {
8638 		if (s->selected_entry)
8639 			re = s->selected_entry;
8640 		else if (view->searching == TOG_SEARCH_FORWARD)
8641 			re = TAILQ_FIRST(&s->refs);
8642 		else
8643 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8644 	}
8645 
8646 	while (1) {
8647 		if (re == NULL) {
8648 			if (s->matched_entry == NULL) {
8649 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8650 				return NULL;
8651 			}
8652 			if (view->searching == TOG_SEARCH_FORWARD)
8653 				re = TAILQ_FIRST(&s->refs);
8654 			else
8655 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8656 		}
8657 
8658 		if (match_reflist_entry(re, &view->regex)) {
8659 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8660 			s->matched_entry = re;
8661 			break;
8662 		}
8663 
8664 		if (view->searching == TOG_SEARCH_FORWARD)
8665 			re = TAILQ_NEXT(re, entry);
8666 		else
8667 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8668 	}
8669 
8670 	if (s->matched_entry) {
8671 		s->first_displayed_entry = s->matched_entry;
8672 		s->selected = 0;
8673 	}
8674 
8675 	return NULL;
8676 }
8677 
8678 static const struct got_error *
8679 show_ref_view(struct tog_view *view)
8680 {
8681 	const struct got_error *err = NULL;
8682 	struct tog_ref_view_state *s = &view->state.ref;
8683 	struct tog_reflist_entry *re;
8684 	char *line = NULL;
8685 	wchar_t *wline;
8686 	struct tog_color *tc;
8687 	int width, n, scrollx;
8688 	int limit = view->nlines;
8689 
8690 	werase(view->window);
8691 
8692 	s->ndisplayed = 0;
8693 	if (view_is_hsplit_top(view))
8694 		--limit;  /* border */
8695 
8696 	if (limit == 0)
8697 		return NULL;
8698 
8699 	re = s->first_displayed_entry;
8700 
8701 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8702 	    s->nrefs) == -1)
8703 		return got_error_from_errno("asprintf");
8704 
8705 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8706 	if (err) {
8707 		free(line);
8708 		return err;
8709 	}
8710 	if (view_needs_focus_indication(view))
8711 		wstandout(view->window);
8712 	waddwstr(view->window, wline);
8713 	while (width++ < view->ncols)
8714 		waddch(view->window, ' ');
8715 	if (view_needs_focus_indication(view))
8716 		wstandend(view->window);
8717 	free(wline);
8718 	wline = NULL;
8719 	free(line);
8720 	line = NULL;
8721 	if (--limit <= 0)
8722 		return NULL;
8723 
8724 	n = 0;
8725 	view->maxx = 0;
8726 	while (re && limit > 0) {
8727 		char *line = NULL;
8728 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8729 
8730 		if (s->show_date) {
8731 			struct got_commit_object *ci;
8732 			struct got_tag_object *tag;
8733 			struct got_object_id *id;
8734 			struct tm tm;
8735 			time_t t;
8736 
8737 			err = got_ref_resolve(&id, s->repo, re->ref);
8738 			if (err)
8739 				return err;
8740 			err = got_object_open_as_tag(&tag, s->repo, id);
8741 			if (err) {
8742 				if (err->code != GOT_ERR_OBJ_TYPE) {
8743 					free(id);
8744 					return err;
8745 				}
8746 				err = got_object_open_as_commit(&ci, s->repo,
8747 				    id);
8748 				if (err) {
8749 					free(id);
8750 					return err;
8751 				}
8752 				t = got_object_commit_get_committer_time(ci);
8753 				got_object_commit_close(ci);
8754 			} else {
8755 				t = got_object_tag_get_tagger_time(tag);
8756 				got_object_tag_close(tag);
8757 			}
8758 			free(id);
8759 			if (gmtime_r(&t, &tm) == NULL)
8760 				return got_error_from_errno("gmtime_r");
8761 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8762 				return got_error(GOT_ERR_NO_SPACE);
8763 		}
8764 		if (got_ref_is_symbolic(re->ref)) {
8765 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8766 			    ymd : "", got_ref_get_name(re->ref),
8767 			    got_ref_get_symref_target(re->ref)) == -1)
8768 				return got_error_from_errno("asprintf");
8769 		} else if (s->show_ids) {
8770 			struct got_object_id *id;
8771 			char *id_str;
8772 			err = got_ref_resolve(&id, s->repo, re->ref);
8773 			if (err)
8774 				return err;
8775 			err = got_object_id_str(&id_str, id);
8776 			if (err) {
8777 				free(id);
8778 				return err;
8779 			}
8780 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8781 			    got_ref_get_name(re->ref), id_str) == -1) {
8782 				err = got_error_from_errno("asprintf");
8783 				free(id);
8784 				free(id_str);
8785 				return err;
8786 			}
8787 			free(id);
8788 			free(id_str);
8789 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8790 		    got_ref_get_name(re->ref)) == -1)
8791 			return got_error_from_errno("asprintf");
8792 
8793 		/* use full line width to determine view->maxx */
8794 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8795 		if (err) {
8796 			free(line);
8797 			return err;
8798 		}
8799 		view->maxx = MAX(view->maxx, width);
8800 		free(wline);
8801 		wline = NULL;
8802 
8803 		err = format_line(&wline, &width, &scrollx, line, view->x,
8804 		    view->ncols, 0, 0);
8805 		if (err) {
8806 			free(line);
8807 			return err;
8808 		}
8809 		if (n == s->selected) {
8810 			if (view->focussed)
8811 				wstandout(view->window);
8812 			s->selected_entry = re;
8813 		}
8814 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8815 		if (tc)
8816 			wattr_on(view->window,
8817 			    COLOR_PAIR(tc->colorpair), NULL);
8818 		waddwstr(view->window, &wline[scrollx]);
8819 		if (tc)
8820 			wattr_off(view->window,
8821 			    COLOR_PAIR(tc->colorpair), NULL);
8822 		if (width < view->ncols)
8823 			waddch(view->window, '\n');
8824 		if (n == s->selected && view->focussed)
8825 			wstandend(view->window);
8826 		free(line);
8827 		free(wline);
8828 		wline = NULL;
8829 		n++;
8830 		s->ndisplayed++;
8831 		s->last_displayed_entry = re;
8832 
8833 		limit--;
8834 		re = TAILQ_NEXT(re, entry);
8835 	}
8836 
8837 	view_border(view);
8838 	return err;
8839 }
8840 
8841 static const struct got_error *
8842 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8843     struct tog_reflist_entry *re, struct got_repository *repo)
8844 {
8845 	const struct got_error *err = NULL;
8846 	struct got_object_id *commit_id = NULL;
8847 	struct tog_view *tree_view;
8848 
8849 	*new_view = NULL;
8850 
8851 	err = resolve_reflist_entry(&commit_id, re, repo);
8852 	if (err) {
8853 		if (err->code != GOT_ERR_OBJ_TYPE)
8854 			return err;
8855 		else
8856 			return NULL;
8857 	}
8858 
8859 
8860 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8861 	if (tree_view == NULL) {
8862 		err = got_error_from_errno("view_open");
8863 		goto done;
8864 	}
8865 
8866 	err = open_tree_view(tree_view, commit_id,
8867 	    got_ref_get_name(re->ref), repo);
8868 	if (err)
8869 		goto done;
8870 
8871 	*new_view = tree_view;
8872 done:
8873 	free(commit_id);
8874 	return err;
8875 }
8876 
8877 static const struct got_error *
8878 ref_goto_line(struct tog_view *view, int nlines)
8879 {
8880 	const struct got_error		*err = NULL;
8881 	struct tog_ref_view_state	*s = &view->state.ref;
8882 	int				 g, idx = s->selected_entry->idx;
8883 
8884 	g = view->gline;
8885 	view->gline = 0;
8886 
8887 	if (g == 0)
8888 		g = 1;
8889 	else if (g > s->nrefs)
8890 		g = s->nrefs;
8891 
8892 	if (g >= s->first_displayed_entry->idx + 1 &&
8893 	    g <= s->last_displayed_entry->idx + 1 &&
8894 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8895 		s->selected = g - s->first_displayed_entry->idx - 1;
8896 		return NULL;
8897 	}
8898 
8899 	if (idx + 1 < g) {
8900 		err = ref_scroll_down(view, g - idx - 1);
8901 		if (err)
8902 			return err;
8903 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8904 		    s->first_displayed_entry->idx + s->selected < g &&
8905 		    s->selected < s->ndisplayed - 1)
8906 			s->selected = g - s->first_displayed_entry->idx - 1;
8907 	} else if (idx + 1 > g)
8908 		ref_scroll_up(s, idx - g + 1);
8909 
8910 	if (g < nlines && s->first_displayed_entry->idx == 0)
8911 		s->selected = g - 1;
8912 
8913 	return NULL;
8914 
8915 }
8916 
8917 static const struct got_error *
8918 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8919 {
8920 	const struct got_error *err = NULL;
8921 	struct tog_ref_view_state *s = &view->state.ref;
8922 	struct tog_reflist_entry *re;
8923 	int n, nscroll = view->nlines - 1;
8924 
8925 	if (view->gline)
8926 		return ref_goto_line(view, nscroll);
8927 
8928 	switch (ch) {
8929 	case '0':
8930 	case '$':
8931 	case KEY_RIGHT:
8932 	case 'l':
8933 	case KEY_LEFT:
8934 	case 'h':
8935 		horizontal_scroll_input(view, ch);
8936 		break;
8937 	case 'i':
8938 		s->show_ids = !s->show_ids;
8939 		view->count = 0;
8940 		break;
8941 	case 'm':
8942 		s->show_date = !s->show_date;
8943 		view->count = 0;
8944 		break;
8945 	case 'o':
8946 		s->sort_by_date = !s->sort_by_date;
8947 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8948 		view->count = 0;
8949 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8950 		    got_ref_cmp_by_commit_timestamp_descending :
8951 		    tog_ref_cmp_by_name, s->repo);
8952 		if (err)
8953 			break;
8954 		got_reflist_object_id_map_free(tog_refs_idmap);
8955 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8956 		    &tog_refs, s->repo);
8957 		if (err)
8958 			break;
8959 		ref_view_free_refs(s);
8960 		err = ref_view_load_refs(s);
8961 		break;
8962 	case KEY_ENTER:
8963 	case '\r':
8964 		view->count = 0;
8965 		if (!s->selected_entry)
8966 			break;
8967 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8968 		break;
8969 	case 'T':
8970 		view->count = 0;
8971 		if (!s->selected_entry)
8972 			break;
8973 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8974 		break;
8975 	case 'g':
8976 	case '=':
8977 	case KEY_HOME:
8978 		s->selected = 0;
8979 		view->count = 0;
8980 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8981 		break;
8982 	case 'G':
8983 	case '*':
8984 	case KEY_END: {
8985 		int eos = view->nlines - 1;
8986 
8987 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8988 			--eos;  /* border */
8989 		s->selected = 0;
8990 		view->count = 0;
8991 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8992 		for (n = 0; n < eos; n++) {
8993 			if (re == NULL)
8994 				break;
8995 			s->first_displayed_entry = re;
8996 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8997 		}
8998 		if (n > 0)
8999 			s->selected = n - 1;
9000 		break;
9001 	}
9002 	case 'k':
9003 	case KEY_UP:
9004 	case CTRL('p'):
9005 		if (s->selected > 0) {
9006 			s->selected--;
9007 			break;
9008 		}
9009 		ref_scroll_up(s, 1);
9010 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9011 			view->count = 0;
9012 		break;
9013 	case CTRL('u'):
9014 	case 'u':
9015 		nscroll /= 2;
9016 		/* FALL THROUGH */
9017 	case KEY_PPAGE:
9018 	case CTRL('b'):
9019 	case 'b':
9020 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9021 			s->selected -= MIN(nscroll, s->selected);
9022 		ref_scroll_up(s, MAX(0, nscroll));
9023 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9024 			view->count = 0;
9025 		break;
9026 	case 'j':
9027 	case KEY_DOWN:
9028 	case CTRL('n'):
9029 		if (s->selected < s->ndisplayed - 1) {
9030 			s->selected++;
9031 			break;
9032 		}
9033 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9034 			/* can't scroll any further */
9035 			view->count = 0;
9036 			break;
9037 		}
9038 		ref_scroll_down(view, 1);
9039 		break;
9040 	case CTRL('d'):
9041 	case 'd':
9042 		nscroll /= 2;
9043 		/* FALL THROUGH */
9044 	case KEY_NPAGE:
9045 	case CTRL('f'):
9046 	case 'f':
9047 	case ' ':
9048 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9049 			/* can't scroll any further; move cursor down */
9050 			if (s->selected < s->ndisplayed - 1)
9051 				s->selected += MIN(nscroll,
9052 				    s->ndisplayed - s->selected - 1);
9053 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9054 				s->selected += s->ndisplayed - s->selected - 1;
9055 			view->count = 0;
9056 			break;
9057 		}
9058 		ref_scroll_down(view, nscroll);
9059 		break;
9060 	case CTRL('l'):
9061 		view->count = 0;
9062 		tog_free_refs();
9063 		err = tog_load_refs(s->repo, s->sort_by_date);
9064 		if (err)
9065 			break;
9066 		ref_view_free_refs(s);
9067 		err = ref_view_load_refs(s);
9068 		break;
9069 	case KEY_RESIZE:
9070 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9071 			s->selected = view->nlines - 2;
9072 		break;
9073 	default:
9074 		view->count = 0;
9075 		break;
9076 	}
9077 
9078 	return err;
9079 }
9080 
9081 __dead static void
9082 usage_ref(void)
9083 {
9084 	endwin();
9085 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9086 	    getprogname());
9087 	exit(1);
9088 }
9089 
9090 static const struct got_error *
9091 cmd_ref(int argc, char *argv[])
9092 {
9093 	const struct got_error *error;
9094 	struct got_repository *repo = NULL;
9095 	struct got_worktree *worktree = NULL;
9096 	char *cwd = NULL, *repo_path = NULL;
9097 	int ch;
9098 	struct tog_view *view;
9099 	int *pack_fds = NULL;
9100 
9101 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9102 		switch (ch) {
9103 		case 'r':
9104 			repo_path = realpath(optarg, NULL);
9105 			if (repo_path == NULL)
9106 				return got_error_from_errno2("realpath",
9107 				    optarg);
9108 			break;
9109 		default:
9110 			usage_ref();
9111 			/* NOTREACHED */
9112 		}
9113 	}
9114 
9115 	argc -= optind;
9116 	argv += optind;
9117 
9118 	if (argc > 1)
9119 		usage_ref();
9120 
9121 	error = got_repo_pack_fds_open(&pack_fds);
9122 	if (error != NULL)
9123 		goto done;
9124 
9125 	if (repo_path == NULL) {
9126 		cwd = getcwd(NULL, 0);
9127 		if (cwd == NULL)
9128 			return got_error_from_errno("getcwd");
9129 		error = got_worktree_open(&worktree, cwd, NULL);
9130 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9131 			goto done;
9132 		if (worktree)
9133 			repo_path =
9134 			    strdup(got_worktree_get_repo_path(worktree));
9135 		else
9136 			repo_path = strdup(cwd);
9137 		if (repo_path == NULL) {
9138 			error = got_error_from_errno("strdup");
9139 			goto done;
9140 		}
9141 	}
9142 
9143 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9144 	if (error != NULL)
9145 		goto done;
9146 
9147 	init_curses();
9148 
9149 	error = apply_unveil(got_repo_get_path(repo), NULL);
9150 	if (error)
9151 		goto done;
9152 
9153 	error = tog_load_refs(repo, 0);
9154 	if (error)
9155 		goto done;
9156 
9157 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9158 	if (view == NULL) {
9159 		error = got_error_from_errno("view_open");
9160 		goto done;
9161 	}
9162 
9163 	error = open_ref_view(view, repo);
9164 	if (error)
9165 		goto done;
9166 
9167 	if (worktree) {
9168 		error = set_tog_base_commit(repo, worktree);
9169 		if (error != NULL)
9170 			goto done;
9171 
9172 		/* Release work tree lock. */
9173 		got_worktree_close(worktree);
9174 		worktree = NULL;
9175 	}
9176 
9177 	error = view_loop(view);
9178 
9179 done:
9180 	free(tog_base_commit.id);
9181 	free(repo_path);
9182 	free(cwd);
9183 	if (worktree != NULL)
9184 		got_worktree_close(worktree);
9185 	if (repo) {
9186 		const struct got_error *close_err = got_repo_close(repo);
9187 		if (close_err)
9188 			error = close_err;
9189 	}
9190 	if (pack_fds) {
9191 		const struct got_error *pack_err =
9192 		    got_repo_pack_fds_close(pack_fds);
9193 		if (error == NULL)
9194 			error = pack_err;
9195 	}
9196 	tog_free_refs();
9197 	return error;
9198 }
9199 
9200 static const struct got_error*
9201 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9202     const char *str)
9203 {
9204 	size_t len;
9205 
9206 	if (win == NULL)
9207 		win = stdscr;
9208 
9209 	len = strlen(str);
9210 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9211 
9212 	if (focus)
9213 		wstandout(win);
9214 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9215 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9216 	if (focus)
9217 		wstandend(win);
9218 
9219 	return NULL;
9220 }
9221 
9222 static const struct got_error *
9223 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9224 {
9225 	off_t *p;
9226 
9227 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9228 	if (p == NULL) {
9229 		free(*line_offsets);
9230 		*line_offsets = NULL;
9231 		return got_error_from_errno("reallocarray");
9232 	}
9233 
9234 	*line_offsets = p;
9235 	(*line_offsets)[*nlines] = off;
9236 	++(*nlines);
9237 	return NULL;
9238 }
9239 
9240 static const struct got_error *
9241 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9242 {
9243 	*ret = 0;
9244 
9245 	for (;n > 0; --n, ++km) {
9246 		char	*t0, *t, *k;
9247 		size_t	 len = 1;
9248 
9249 		if (km->keys == NULL)
9250 			continue;
9251 
9252 		t = t0 = strdup(km->keys);
9253 		if (t0 == NULL)
9254 			return got_error_from_errno("strdup");
9255 
9256 		len += strlen(t);
9257 		while ((k = strsep(&t, " ")) != NULL)
9258 			len += strlen(k) > 1 ? 2 : 0;
9259 		free(t0);
9260 		*ret = MAX(*ret, len);
9261 	}
9262 
9263 	return NULL;
9264 }
9265 
9266 /*
9267  * Write keymap section headers, keys, and key info in km to f.
9268  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9269  * wrap control and symbolic keys in guillemets, else use <>.
9270  */
9271 static const struct got_error *
9272 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9273 {
9274 	int n, len = width;
9275 
9276 	if (km->keys) {
9277 		static const char *u8_glyph[] = {
9278 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9279 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9280 		};
9281 		char	*t0, *t, *k;
9282 		int	 cs, s, first = 1;
9283 
9284 		cs = got_locale_is_utf8();
9285 
9286 		t = t0 = strdup(km->keys);
9287 		if (t0 == NULL)
9288 			return got_error_from_errno("strdup");
9289 
9290 		len = strlen(km->keys);
9291 		while ((k = strsep(&t, " ")) != NULL) {
9292 			s = strlen(k) > 1;  /* control or symbolic key */
9293 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9294 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9295 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9296 			if (n < 0) {
9297 				free(t0);
9298 				return got_error_from_errno("fprintf");
9299 			}
9300 			first = 0;
9301 			len += s ? 2 : 0;
9302 			*off += n;
9303 		}
9304 		free(t0);
9305 	}
9306 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9307 	if (n < 0)
9308 		return got_error_from_errno("fprintf");
9309 	*off += n;
9310 
9311 	return NULL;
9312 }
9313 
9314 static const struct got_error *
9315 format_help(struct tog_help_view_state *s)
9316 {
9317 	const struct got_error		*err = NULL;
9318 	off_t				 off = 0;
9319 	int				 i, max, n, show = s->all;
9320 	static const struct tog_key_map	 km[] = {
9321 #define KEYMAP_(info, type)	{ NULL, (info), type }
9322 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9323 		GENERATE_HELP
9324 #undef KEYMAP_
9325 #undef KEY_
9326 	};
9327 
9328 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9329 	if (err)
9330 		return err;
9331 
9332 	n = nitems(km);
9333 	err = max_key_str(&max, km, n);
9334 	if (err)
9335 		return err;
9336 
9337 	for (i = 0; i < n; ++i) {
9338 		if (km[i].keys == NULL) {
9339 			show = s->all;
9340 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9341 			    km[i].type == s->type || s->all)
9342 				show = 1;
9343 		}
9344 		if (show) {
9345 			err = format_help_line(&off, s->f, &km[i], max);
9346 			if (err)
9347 				return err;
9348 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9349 			if (err)
9350 				return err;
9351 		}
9352 	}
9353 	fputc('\n', s->f);
9354 	++off;
9355 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9356 	return err;
9357 }
9358 
9359 static const struct got_error *
9360 create_help(struct tog_help_view_state *s)
9361 {
9362 	FILE			*f;
9363 	const struct got_error	*err;
9364 
9365 	free(s->line_offsets);
9366 	s->line_offsets = NULL;
9367 	s->nlines = 0;
9368 
9369 	f = got_opentemp();
9370 	if (f == NULL)
9371 		return got_error_from_errno("got_opentemp");
9372 	s->f = f;
9373 
9374 	err = format_help(s);
9375 	if (err)
9376 		return err;
9377 
9378 	if (s->f && fflush(s->f) != 0)
9379 		return got_error_from_errno("fflush");
9380 
9381 	return NULL;
9382 }
9383 
9384 static const struct got_error *
9385 search_start_help_view(struct tog_view *view)
9386 {
9387 	view->state.help.matched_line = 0;
9388 	return NULL;
9389 }
9390 
9391 static void
9392 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9393     size_t *nlines, int **first, int **last, int **match, int **selected)
9394 {
9395 	struct tog_help_view_state *s = &view->state.help;
9396 
9397 	*f = s->f;
9398 	*nlines = s->nlines;
9399 	*line_offsets = s->line_offsets;
9400 	*match = &s->matched_line;
9401 	*first = &s->first_displayed_line;
9402 	*last = &s->last_displayed_line;
9403 	*selected = &s->selected_line;
9404 }
9405 
9406 static const struct got_error *
9407 show_help_view(struct tog_view *view)
9408 {
9409 	struct tog_help_view_state	*s = &view->state.help;
9410 	const struct got_error		*err;
9411 	regmatch_t			*regmatch = &view->regmatch;
9412 	wchar_t				*wline;
9413 	char				*line;
9414 	ssize_t				 linelen;
9415 	size_t				 linesz = 0;
9416 	int				 width, nprinted = 0, rc = 0;
9417 	int				 eos = view->nlines;
9418 
9419 	if (view_is_hsplit_top(view))
9420 		--eos;  /* account for border */
9421 
9422 	s->lineno = 0;
9423 	rewind(s->f);
9424 	werase(view->window);
9425 
9426 	if (view->gline > s->nlines - 1)
9427 		view->gline = s->nlines - 1;
9428 
9429 	err = win_draw_center(view->window, 0, 0, view->ncols,
9430 	    view_needs_focus_indication(view),
9431 	    "tog help (press q to return to tog)");
9432 	if (err)
9433 		return err;
9434 	if (eos <= 1)
9435 		return NULL;
9436 	waddstr(view->window, "\n\n");
9437 	eos -= 2;
9438 
9439 	s->eof = 0;
9440 	view->maxx = 0;
9441 	line = NULL;
9442 	while (eos > 0 && nprinted < eos) {
9443 		attr_t attr = 0;
9444 
9445 		linelen = getline(&line, &linesz, s->f);
9446 		if (linelen == -1) {
9447 			if (!feof(s->f)) {
9448 				free(line);
9449 				return got_ferror(s->f, GOT_ERR_IO);
9450 			}
9451 			s->eof = 1;
9452 			break;
9453 		}
9454 		if (++s->lineno < s->first_displayed_line)
9455 			continue;
9456 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9457 			continue;
9458 		if (s->lineno == view->hiline)
9459 			attr = A_STANDOUT;
9460 
9461 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9462 		    view->x ? 1 : 0);
9463 		if (err) {
9464 			free(line);
9465 			return err;
9466 		}
9467 		view->maxx = MAX(view->maxx, width);
9468 		free(wline);
9469 		wline = NULL;
9470 
9471 		if (attr)
9472 			wattron(view->window, attr);
9473 		if (s->first_displayed_line + nprinted == s->matched_line &&
9474 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9475 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9476 			    view->window, view->x, regmatch);
9477 			if (err) {
9478 				free(line);
9479 				return err;
9480 			}
9481 		} else {
9482 			int skip;
9483 
9484 			err = format_line(&wline, &width, &skip, line,
9485 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9486 			if (err) {
9487 				free(line);
9488 				return err;
9489 			}
9490 			waddwstr(view->window, &wline[skip]);
9491 			free(wline);
9492 			wline = NULL;
9493 		}
9494 		if (s->lineno == view->hiline) {
9495 			while (width++ < view->ncols)
9496 				waddch(view->window, ' ');
9497 		} else {
9498 			if (width < view->ncols)
9499 				waddch(view->window, '\n');
9500 		}
9501 		if (attr)
9502 			wattroff(view->window, attr);
9503 		if (++nprinted == 1)
9504 			s->first_displayed_line = s->lineno;
9505 	}
9506 	free(line);
9507 	if (nprinted > 0)
9508 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9509 	else
9510 		s->last_displayed_line = s->first_displayed_line;
9511 
9512 	view_border(view);
9513 
9514 	if (s->eof) {
9515 		rc = waddnstr(view->window,
9516 		    "See the tog(1) manual page for full documentation",
9517 		    view->ncols - 1);
9518 		if (rc == ERR)
9519 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9520 	} else {
9521 		wmove(view->window, view->nlines - 1, 0);
9522 		wclrtoeol(view->window);
9523 		wstandout(view->window);
9524 		rc = waddnstr(view->window, "scroll down for more...",
9525 		    view->ncols - 1);
9526 		if (rc == ERR)
9527 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9528 		if (getcurx(view->window) < view->ncols - 6) {
9529 			rc = wprintw(view->window, "[%.0f%%]",
9530 			    100.00 * s->last_displayed_line / s->nlines);
9531 			if (rc == ERR)
9532 				return got_error_msg(GOT_ERR_IO, "wprintw");
9533 		}
9534 		wstandend(view->window);
9535 	}
9536 
9537 	return NULL;
9538 }
9539 
9540 static const struct got_error *
9541 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9542 {
9543 	struct tog_help_view_state	*s = &view->state.help;
9544 	const struct got_error		*err = NULL;
9545 	char				*line = NULL;
9546 	ssize_t				 linelen;
9547 	size_t				 linesz = 0;
9548 	int				 eos, nscroll;
9549 
9550 	eos = nscroll = view->nlines;
9551 	if (view_is_hsplit_top(view))
9552 		--eos;  /* border */
9553 
9554 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9555 
9556 	switch (ch) {
9557 	case '0':
9558 	case '$':
9559 	case KEY_RIGHT:
9560 	case 'l':
9561 	case KEY_LEFT:
9562 	case 'h':
9563 		horizontal_scroll_input(view, ch);
9564 		break;
9565 	case 'g':
9566 	case KEY_HOME:
9567 		s->first_displayed_line = 1;
9568 		view->count = 0;
9569 		break;
9570 	case 'G':
9571 	case KEY_END:
9572 		view->count = 0;
9573 		if (s->eof)
9574 			break;
9575 		s->first_displayed_line = (s->nlines - eos) + 3;
9576 		s->eof = 1;
9577 		break;
9578 	case 'k':
9579 	case KEY_UP:
9580 		if (s->first_displayed_line > 1)
9581 			--s->first_displayed_line;
9582 		else
9583 			view->count = 0;
9584 		break;
9585 	case CTRL('u'):
9586 	case 'u':
9587 		nscroll /= 2;
9588 		/* FALL THROUGH */
9589 	case KEY_PPAGE:
9590 	case CTRL('b'):
9591 	case 'b':
9592 		if (s->first_displayed_line == 1) {
9593 			view->count = 0;
9594 			break;
9595 		}
9596 		while (--nscroll > 0 && s->first_displayed_line > 1)
9597 			s->first_displayed_line--;
9598 		break;
9599 	case 'j':
9600 	case KEY_DOWN:
9601 	case CTRL('n'):
9602 		if (!s->eof)
9603 			++s->first_displayed_line;
9604 		else
9605 			view->count = 0;
9606 		break;
9607 	case CTRL('d'):
9608 	case 'd':
9609 		nscroll /= 2;
9610 		/* FALL THROUGH */
9611 	case KEY_NPAGE:
9612 	case CTRL('f'):
9613 	case 'f':
9614 	case ' ':
9615 		if (s->eof) {
9616 			view->count = 0;
9617 			break;
9618 		}
9619 		while (!s->eof && --nscroll > 0) {
9620 			linelen = getline(&line, &linesz, s->f);
9621 			s->first_displayed_line++;
9622 			if (linelen == -1) {
9623 				if (feof(s->f))
9624 					s->eof = 1;
9625 				else
9626 					err = got_ferror(s->f, GOT_ERR_IO);
9627 				break;
9628 			}
9629 		}
9630 		free(line);
9631 		break;
9632 	default:
9633 		view->count = 0;
9634 		break;
9635 	}
9636 
9637 	return err;
9638 }
9639 
9640 static const struct got_error *
9641 close_help_view(struct tog_view *view)
9642 {
9643 	struct tog_help_view_state *s = &view->state.help;
9644 
9645 	free(s->line_offsets);
9646 	s->line_offsets = NULL;
9647 	if (fclose(s->f) == EOF)
9648 		return got_error_from_errno("fclose");
9649 
9650 	return NULL;
9651 }
9652 
9653 static const struct got_error *
9654 reset_help_view(struct tog_view *view)
9655 {
9656 	struct tog_help_view_state *s = &view->state.help;
9657 
9658 
9659 	if (s->f && fclose(s->f) == EOF)
9660 		return got_error_from_errno("fclose");
9661 
9662 	wclear(view->window);
9663 	view->count = 0;
9664 	view->x = 0;
9665 	s->all = !s->all;
9666 	s->first_displayed_line = 1;
9667 	s->last_displayed_line = view->nlines;
9668 	s->matched_line = 0;
9669 
9670 	return create_help(s);
9671 }
9672 
9673 static const struct got_error *
9674 open_help_view(struct tog_view *view, struct tog_view *parent)
9675 {
9676 	const struct got_error		*err = NULL;
9677 	struct tog_help_view_state	*s = &view->state.help;
9678 
9679 	s->type = (enum tog_keymap_type)parent->type;
9680 	s->first_displayed_line = 1;
9681 	s->last_displayed_line = view->nlines;
9682 	s->selected_line = 1;
9683 
9684 	view->show = show_help_view;
9685 	view->input = input_help_view;
9686 	view->reset = reset_help_view;
9687 	view->close = close_help_view;
9688 	view->search_start = search_start_help_view;
9689 	view->search_setup = search_setup_help_view;
9690 	view->search_next = search_next_view_match;
9691 
9692 	err = create_help(s);
9693 	return err;
9694 }
9695 
9696 static const struct got_error *
9697 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9698     enum tog_view_type request, int y, int x)
9699 {
9700 	const struct got_error *err = NULL;
9701 
9702 	*new_view = NULL;
9703 
9704 	switch (request) {
9705 	case TOG_VIEW_DIFF:
9706 		if (view->type == TOG_VIEW_LOG) {
9707 			struct tog_log_view_state *s = &view->state.log;
9708 
9709 			err = open_diff_view_for_commit(new_view, y, x,
9710 			    s->selected_entry->commit, s->selected_entry->id,
9711 			    view, s->repo);
9712 		} else
9713 			return got_error_msg(GOT_ERR_NOT_IMPL,
9714 			    "parent/child view pair not supported");
9715 		break;
9716 	case TOG_VIEW_BLAME:
9717 		if (view->type == TOG_VIEW_TREE) {
9718 			struct tog_tree_view_state *s = &view->state.tree;
9719 
9720 			err = blame_tree_entry(new_view, y, x,
9721 			    s->selected_entry, &s->parents, s->commit_id,
9722 			    s->repo);
9723 		} else
9724 			return got_error_msg(GOT_ERR_NOT_IMPL,
9725 			    "parent/child view pair not supported");
9726 		break;
9727 	case TOG_VIEW_LOG:
9728 		if (view->type == TOG_VIEW_BLAME)
9729 			err = log_annotated_line(new_view, y, x,
9730 			    view->state.blame.repo, view->state.blame.id_to_log);
9731 		else if (view->type == TOG_VIEW_TREE)
9732 			err = log_selected_tree_entry(new_view, y, x,
9733 			    &view->state.tree);
9734 		else if (view->type == TOG_VIEW_REF)
9735 			err = log_ref_entry(new_view, y, x,
9736 			    view->state.ref.selected_entry,
9737 			    view->state.ref.repo);
9738 		else
9739 			return got_error_msg(GOT_ERR_NOT_IMPL,
9740 			    "parent/child view pair not supported");
9741 		break;
9742 	case TOG_VIEW_TREE:
9743 		if (view->type == TOG_VIEW_LOG)
9744 			err = browse_commit_tree(new_view, y, x,
9745 			    view->state.log.selected_entry,
9746 			    view->state.log.in_repo_path,
9747 			    view->state.log.head_ref_name,
9748 			    view->state.log.repo);
9749 		else if (view->type == TOG_VIEW_REF)
9750 			err = browse_ref_tree(new_view, y, x,
9751 			    view->state.ref.selected_entry,
9752 			    view->state.ref.repo);
9753 		else
9754 			return got_error_msg(GOT_ERR_NOT_IMPL,
9755 			    "parent/child view pair not supported");
9756 		break;
9757 	case TOG_VIEW_REF:
9758 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9759 		if (*new_view == NULL)
9760 			return got_error_from_errno("view_open");
9761 		if (view->type == TOG_VIEW_LOG)
9762 			err = open_ref_view(*new_view, view->state.log.repo);
9763 		else if (view->type == TOG_VIEW_TREE)
9764 			err = open_ref_view(*new_view, view->state.tree.repo);
9765 		else
9766 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9767 			    "parent/child view pair not supported");
9768 		if (err)
9769 			view_close(*new_view);
9770 		break;
9771 	case TOG_VIEW_HELP:
9772 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9773 		if (*new_view == NULL)
9774 			return got_error_from_errno("view_open");
9775 		err = open_help_view(*new_view, view);
9776 		if (err)
9777 			view_close(*new_view);
9778 		break;
9779 	default:
9780 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9781 	}
9782 
9783 	return err;
9784 }
9785 
9786 /*
9787  * If view was scrolled down to move the selected line into view when opening a
9788  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9789  */
9790 static void
9791 offset_selection_up(struct tog_view *view)
9792 {
9793 	switch (view->type) {
9794 	case TOG_VIEW_BLAME: {
9795 		struct tog_blame_view_state *s = &view->state.blame;
9796 		if (s->first_displayed_line == 1) {
9797 			s->selected_line = MAX(s->selected_line - view->offset,
9798 			    1);
9799 			break;
9800 		}
9801 		if (s->first_displayed_line > view->offset)
9802 			s->first_displayed_line -= view->offset;
9803 		else
9804 			s->first_displayed_line = 1;
9805 		s->selected_line += view->offset;
9806 		break;
9807 	}
9808 	case TOG_VIEW_LOG:
9809 		log_scroll_up(&view->state.log, view->offset);
9810 		view->state.log.selected += view->offset;
9811 		break;
9812 	case TOG_VIEW_REF:
9813 		ref_scroll_up(&view->state.ref, view->offset);
9814 		view->state.ref.selected += view->offset;
9815 		break;
9816 	case TOG_VIEW_TREE:
9817 		tree_scroll_up(&view->state.tree, view->offset);
9818 		view->state.tree.selected += view->offset;
9819 		break;
9820 	default:
9821 		break;
9822 	}
9823 
9824 	view->offset = 0;
9825 }
9826 
9827 /*
9828  * If the selected line is in the section of screen covered by the bottom split,
9829  * scroll down offset lines to move it into view and index its new position.
9830  */
9831 static const struct got_error *
9832 offset_selection_down(struct tog_view *view)
9833 {
9834 	const struct got_error	*err = NULL;
9835 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9836 	int			*selected = NULL;
9837 	int			 header, offset;
9838 
9839 	switch (view->type) {
9840 	case TOG_VIEW_BLAME: {
9841 		struct tog_blame_view_state *s = &view->state.blame;
9842 		header = 3;
9843 		scrolld = NULL;
9844 		if (s->selected_line > view->nlines - header) {
9845 			offset = abs(view->nlines - s->selected_line - header);
9846 			s->first_displayed_line += offset;
9847 			s->selected_line -= offset;
9848 			view->offset = offset;
9849 		}
9850 		break;
9851 	}
9852 	case TOG_VIEW_LOG: {
9853 		struct tog_log_view_state *s = &view->state.log;
9854 		scrolld = &log_scroll_down;
9855 		header = view_is_parent_view(view) ? 3 : 2;
9856 		selected = &s->selected;
9857 		break;
9858 	}
9859 	case TOG_VIEW_REF: {
9860 		struct tog_ref_view_state *s = &view->state.ref;
9861 		scrolld = &ref_scroll_down;
9862 		header = 3;
9863 		selected = &s->selected;
9864 		break;
9865 	}
9866 	case TOG_VIEW_TREE: {
9867 		struct tog_tree_view_state *s = &view->state.tree;
9868 		scrolld = &tree_scroll_down;
9869 		header = 5;
9870 		selected = &s->selected;
9871 		break;
9872 	}
9873 	default:
9874 		selected = NULL;
9875 		scrolld = NULL;
9876 		header = 0;
9877 		break;
9878 	}
9879 
9880 	if (selected && *selected > view->nlines - header) {
9881 		offset = abs(view->nlines - *selected - header);
9882 		view->offset = offset;
9883 		if (scrolld && offset) {
9884 			err = scrolld(view, offset);
9885 			*selected -= offset;
9886 		}
9887 	}
9888 
9889 	return err;
9890 }
9891 
9892 static void
9893 list_commands(FILE *fp)
9894 {
9895 	size_t i;
9896 
9897 	fprintf(fp, "commands:");
9898 	for (i = 0; i < nitems(tog_commands); i++) {
9899 		const struct tog_cmd *cmd = &tog_commands[i];
9900 		fprintf(fp, " %s", cmd->name);
9901 	}
9902 	fputc('\n', fp);
9903 }
9904 
9905 __dead static void
9906 usage(int hflag, int status)
9907 {
9908 	FILE *fp = (status == 0) ? stdout : stderr;
9909 
9910 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9911 	    getprogname());
9912 	if (hflag) {
9913 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9914 		list_commands(fp);
9915 	}
9916 	exit(status);
9917 }
9918 
9919 static char **
9920 make_argv(int argc, ...)
9921 {
9922 	va_list ap;
9923 	char **argv;
9924 	int i;
9925 
9926 	va_start(ap, argc);
9927 
9928 	argv = calloc(argc, sizeof(char *));
9929 	if (argv == NULL)
9930 		err(1, "calloc");
9931 	for (i = 0; i < argc; i++) {
9932 		argv[i] = strdup(va_arg(ap, char *));
9933 		if (argv[i] == NULL)
9934 			err(1, "strdup");
9935 	}
9936 
9937 	va_end(ap);
9938 	return argv;
9939 }
9940 
9941 /*
9942  * Try to convert 'tog path' into a 'tog log path' command.
9943  * The user could simply have mistyped the command rather than knowingly
9944  * provided a path. So check whether argv[0] can in fact be resolved
9945  * to a path in the HEAD commit and print a special error if not.
9946  * This hack is for mpi@ <3
9947  */
9948 static const struct got_error *
9949 tog_log_with_path(int argc, char *argv[])
9950 {
9951 	const struct got_error *error = NULL, *close_err;
9952 	const struct tog_cmd *cmd = NULL;
9953 	struct got_repository *repo = NULL;
9954 	struct got_worktree *worktree = NULL;
9955 	struct got_object_id *commit_id = NULL, *id = NULL;
9956 	struct got_commit_object *commit = NULL;
9957 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9958 	char *commit_id_str = NULL, **cmd_argv = NULL;
9959 	int *pack_fds = NULL;
9960 
9961 	cwd = getcwd(NULL, 0);
9962 	if (cwd == NULL)
9963 		return got_error_from_errno("getcwd");
9964 
9965 	error = got_repo_pack_fds_open(&pack_fds);
9966 	if (error != NULL)
9967 		goto done;
9968 
9969 	error = got_worktree_open(&worktree, cwd, NULL);
9970 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9971 		goto done;
9972 
9973 	if (worktree)
9974 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9975 	else
9976 		repo_path = strdup(cwd);
9977 	if (repo_path == NULL) {
9978 		error = got_error_from_errno("strdup");
9979 		goto done;
9980 	}
9981 
9982 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9983 	if (error != NULL)
9984 		goto done;
9985 
9986 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9987 	    repo, worktree);
9988 	if (error)
9989 		goto done;
9990 
9991 	error = tog_load_refs(repo, 0);
9992 	if (error)
9993 		goto done;
9994 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9995 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9996 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9997 	if (error)
9998 		goto done;
9999 
10000 	if (worktree) {
10001 		got_worktree_close(worktree);
10002 		worktree = NULL;
10003 	}
10004 
10005 	error = got_object_open_as_commit(&commit, repo, commit_id);
10006 	if (error)
10007 		goto done;
10008 
10009 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10010 	if (error) {
10011 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10012 			goto done;
10013 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10014 		    getprogname(), argv[0]);
10015 		usage(1, 1);
10016 		/* not reached */
10017 	}
10018 
10019 	error = got_object_id_str(&commit_id_str, commit_id);
10020 	if (error)
10021 		goto done;
10022 
10023 	cmd = &tog_commands[0]; /* log */
10024 	argc = 4;
10025 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10026 	error = cmd->cmd_main(argc, cmd_argv);
10027 done:
10028 	if (repo) {
10029 		close_err = got_repo_close(repo);
10030 		if (error == NULL)
10031 			error = close_err;
10032 	}
10033 	if (commit)
10034 		got_object_commit_close(commit);
10035 	if (worktree)
10036 		got_worktree_close(worktree);
10037 	if (pack_fds) {
10038 		const struct got_error *pack_err =
10039 		    got_repo_pack_fds_close(pack_fds);
10040 		if (error == NULL)
10041 			error = pack_err;
10042 	}
10043 	free(id);
10044 	free(commit_id_str);
10045 	free(commit_id);
10046 	free(cwd);
10047 	free(repo_path);
10048 	free(in_repo_path);
10049 	if (cmd_argv) {
10050 		int i;
10051 		for (i = 0; i < argc; i++)
10052 			free(cmd_argv[i]);
10053 		free(cmd_argv);
10054 	}
10055 	tog_free_refs();
10056 	return error;
10057 }
10058 
10059 int
10060 main(int argc, char *argv[])
10061 {
10062 	const struct got_error *io_err, *error = NULL;
10063 	const struct tog_cmd *cmd = NULL;
10064 	int ch, hflag = 0, Vflag = 0;
10065 	char **cmd_argv = NULL;
10066 	static const struct option longopts[] = {
10067 	    { "version", no_argument, NULL, 'V' },
10068 	    { NULL, 0, NULL, 0}
10069 	};
10070 	char *diff_algo_str = NULL;
10071 	const char *test_script_path;
10072 
10073 	setlocale(LC_CTYPE, "");
10074 
10075 	/*
10076 	 * Override default signal handlers before starting ncurses.
10077 	 * This should prevent ncurses from installing its own
10078 	 * broken cleanup() signal handler.
10079 	 */
10080 	signal(SIGWINCH, tog_sigwinch);
10081 	signal(SIGPIPE, tog_sigpipe);
10082 	signal(SIGCONT, tog_sigcont);
10083 	signal(SIGINT, tog_sigint);
10084 	signal(SIGTERM, tog_sigterm);
10085 
10086 	/*
10087 	 * Test mode init must happen before pledge() because "tty" will
10088 	 * not allow TTY-related ioctls to occur via regular files.
10089 	 */
10090 	test_script_path = getenv("TOG_TEST_SCRIPT");
10091 	if (test_script_path != NULL) {
10092 		error = init_mock_term(test_script_path);
10093 		if (error) {
10094 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10095 			return 1;
10096 		}
10097 	} else if (!isatty(STDIN_FILENO))
10098 		errx(1, "standard input is not a tty");
10099 
10100 #if !defined(PROFILE)
10101 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10102 	    NULL) == -1)
10103 		err(1, "pledge");
10104 #endif
10105 
10106 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10107 		switch (ch) {
10108 		case 'h':
10109 			hflag = 1;
10110 			break;
10111 		case 'V':
10112 			Vflag = 1;
10113 			break;
10114 		default:
10115 			usage(hflag, 1);
10116 			/* NOTREACHED */
10117 		}
10118 	}
10119 
10120 	argc -= optind;
10121 	argv += optind;
10122 	optind = 1;
10123 	optreset = 1;
10124 
10125 	if (Vflag) {
10126 		got_version_print_str();
10127 		return 0;
10128 	}
10129 
10130 	if (argc == 0) {
10131 		if (hflag)
10132 			usage(hflag, 0);
10133 		/* Build an argument vector which runs a default command. */
10134 		cmd = &tog_commands[0];
10135 		argc = 1;
10136 		cmd_argv = make_argv(argc, cmd->name);
10137 	} else {
10138 		size_t i;
10139 
10140 		/* Did the user specify a command? */
10141 		for (i = 0; i < nitems(tog_commands); i++) {
10142 			if (strncmp(tog_commands[i].name, argv[0],
10143 			    strlen(argv[0])) == 0) {
10144 				cmd = &tog_commands[i];
10145 				break;
10146 			}
10147 		}
10148 	}
10149 
10150 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10151 	if (diff_algo_str) {
10152 		if (strcasecmp(diff_algo_str, "patience") == 0)
10153 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10154 		if (strcasecmp(diff_algo_str, "myers") == 0)
10155 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10156 	}
10157 
10158 	tog_base_commit.idx = -1;
10159 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10160 
10161 	if (cmd == NULL) {
10162 		if (argc != 1)
10163 			usage(0, 1);
10164 		/* No command specified; try log with a path */
10165 		error = tog_log_with_path(argc, argv);
10166 	} else {
10167 		if (hflag)
10168 			cmd->cmd_usage();
10169 		else
10170 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10171 	}
10172 
10173 	if (using_mock_io) {
10174 		io_err = tog_io_close();
10175 		if (error == NULL)
10176 			error = io_err;
10177 	}
10178 	endwin();
10179 	if (cmd_argv) {
10180 		int i;
10181 		for (i = 0; i < argc; i++)
10182 			free(cmd_argv[i]);
10183 		free(cmd_argv);
10184 	}
10185 
10186 	if (error && error->code != GOT_ERR_CANCELLED &&
10187 	    error->code != GOT_ERR_EOF &&
10188 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10189 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10190 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10191 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10192 		return 1;
10193 	}
10194 	return 0;
10195 }