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_PATIENCE;
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 	char *action;
340 	FILE *f, *f1, *f2;
341 	int fd1, fd2;
342 	int lineno;
343 	int first_displayed_line;
344 	int last_displayed_line;
345 	int eof;
346 	int diff_context;
347 	int ignore_whitespace;
348 	int force_text_diff;
349 	struct got_repository *repo;
350 	struct got_diff_line *lines;
351 	size_t nlines;
352 	int matched_line;
353 	int selected_line;
354 
355 	/* passed from log or blame view; may be NULL */
356 	struct tog_view *parent_view;
357 };
358 
359 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
360 static volatile sig_atomic_t tog_thread_error;
361 
362 struct tog_log_thread_args {
363 	pthread_cond_t need_commits;
364 	pthread_cond_t commit_loaded;
365 	int commits_needed;
366 	int load_all;
367 	struct got_commit_graph *graph;
368 	struct commit_queue *real_commits;
369 	const char *in_repo_path;
370 	struct got_object_id *start_id;
371 	struct got_repository *repo;
372 	int *pack_fds;
373 	int log_complete;
374 	pthread_cond_t log_loaded;
375 	sig_atomic_t *quit;
376 	struct commit_queue_entry **first_displayed_entry;
377 	struct commit_queue_entry **selected_entry;
378 	int *searching;
379 	int *search_next_done;
380 	regex_t *regex;
381 	int *limiting;
382 	int limit_match;
383 	regex_t *limit_regex;
384 	struct commit_queue *limit_commits;
385 	struct got_worktree *worktree;
386 	int need_commit_marker;
387 };
388 
389 struct tog_log_view_state {
390 	struct commit_queue *commits;
391 	struct commit_queue_entry *first_displayed_entry;
392 	struct commit_queue_entry *last_displayed_entry;
393 	struct commit_queue_entry *selected_entry;
394 	struct commit_queue_entry *marked_entry;
395 	struct commit_queue real_commits;
396 	int selected;
397 	char *in_repo_path;
398 	char *head_ref_name;
399 	int log_branches;
400 	struct got_repository *repo;
401 	struct got_object_id *start_id;
402 	sig_atomic_t quit;
403 	pthread_t thread;
404 	struct tog_log_thread_args thread_args;
405 	struct commit_queue_entry *matched_entry;
406 	struct commit_queue_entry *search_entry;
407 	struct tog_colors colors;
408 	int use_committer;
409 	int limit_view;
410 	regex_t limit_regex;
411 	struct commit_queue limit_commits;
412 };
413 
414 #define TOG_COLOR_DIFF_MINUS		1
415 #define TOG_COLOR_DIFF_PLUS		2
416 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
417 #define TOG_COLOR_DIFF_META		4
418 #define TOG_COLOR_TREE_SUBMODULE	5
419 #define TOG_COLOR_TREE_SYMLINK		6
420 #define TOG_COLOR_TREE_DIRECTORY	7
421 #define TOG_COLOR_TREE_EXECUTABLE	8
422 #define TOG_COLOR_COMMIT		9
423 #define TOG_COLOR_AUTHOR		10
424 #define TOG_COLOR_DATE			11
425 #define TOG_COLOR_REFS_HEADS		12
426 #define TOG_COLOR_REFS_TAGS		13
427 #define TOG_COLOR_REFS_REMOTES		14
428 #define TOG_COLOR_REFS_BACKUP		15
429 
430 struct tog_blame_cb_args {
431 	struct tog_blame_line *lines; /* one per line */
432 	int nlines;
433 
434 	struct tog_view *view;
435 	struct got_object_id *commit_id;
436 	int *quit;
437 };
438 
439 struct tog_blame_thread_args {
440 	const char *path;
441 	struct got_repository *repo;
442 	struct tog_blame_cb_args *cb_args;
443 	int *complete;
444 	got_cancel_cb cancel_cb;
445 	void *cancel_arg;
446 	pthread_cond_t blame_complete;
447 };
448 
449 struct tog_blame {
450 	FILE *f;
451 	off_t filesize;
452 	struct tog_blame_line *lines;
453 	int nlines;
454 	off_t *line_offsets;
455 	pthread_t thread;
456 	struct tog_blame_thread_args thread_args;
457 	struct tog_blame_cb_args cb_args;
458 	const char *path;
459 	int *pack_fds;
460 };
461 
462 struct tog_blame_view_state {
463 	int first_displayed_line;
464 	int last_displayed_line;
465 	int selected_line;
466 	int last_diffed_line;
467 	int blame_complete;
468 	int eof;
469 	int done;
470 	struct got_object_id_queue blamed_commits;
471 	struct got_object_qid *blamed_commit;
472 	char *path;
473 	struct got_repository *repo;
474 	struct got_object_id *commit_id;
475 	struct got_object_id *id_to_log;
476 	struct tog_blame blame;
477 	int matched_line;
478 	struct tog_colors colors;
479 };
480 
481 struct tog_parent_tree {
482 	TAILQ_ENTRY(tog_parent_tree) entry;
483 	struct got_tree_object *tree;
484 	struct got_tree_entry *first_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int selected;
487 };
488 
489 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
490 
491 struct tog_tree_view_state {
492 	char *tree_label;
493 	struct got_object_id *commit_id;/* commit which this tree belongs to */
494 	struct got_tree_object *root;	/* the commit's root tree entry */
495 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
496 	struct got_tree_entry *first_displayed_entry;
497 	struct got_tree_entry *last_displayed_entry;
498 	struct got_tree_entry *selected_entry;
499 	int ndisplayed, selected, show_ids;
500 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
501 	char *head_ref_name;
502 	struct got_repository *repo;
503 	struct got_tree_entry *matched_entry;
504 	struct tog_colors colors;
505 };
506 
507 struct tog_reflist_entry {
508 	TAILQ_ENTRY(tog_reflist_entry) entry;
509 	struct got_reference *ref;
510 	int idx;
511 };
512 
513 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
514 
515 struct tog_ref_view_state {
516 	struct tog_reflist_head refs;
517 	struct tog_reflist_entry *first_displayed_entry;
518 	struct tog_reflist_entry *last_displayed_entry;
519 	struct tog_reflist_entry *selected_entry;
520 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
521 	struct got_repository *repo;
522 	struct tog_reflist_entry *matched_entry;
523 	struct tog_colors colors;
524 };
525 
526 struct tog_help_view_state {
527 	FILE			*f;
528 	off_t			*line_offsets;
529 	size_t			 nlines;
530 	int			 lineno;
531 	int			 first_displayed_line;
532 	int			 last_displayed_line;
533 	int			 eof;
534 	int			 matched_line;
535 	int			 selected_line;
536 	int			 all;
537 	enum tog_keymap_type	 type;
538 };
539 
540 #define GENERATE_HELP \
541 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
542 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
543 	KEY_("k C-p Up", "Move cursor or page up one line"), \
544 	KEY_("j C-n Down", "Move cursor or page down one line"), \
545 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
546 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
547 	KEY_("C-u u", "Scroll the view up one half page"), \
548 	KEY_("C-d d", "Scroll the view down one half page"), \
549 	KEY_("g", "Go to line N (default: first line)"), \
550 	KEY_("Home =", "Go to the first line"), \
551 	KEY_("G", "Go to line N (default: last line)"), \
552 	KEY_("End *", "Go to the last line"), \
553 	KEY_("l Right", "Scroll the view right"), \
554 	KEY_("h Left", "Scroll the view left"), \
555 	KEY_("$", "Scroll view to the rightmost position"), \
556 	KEY_("0", "Scroll view to the leftmost position"), \
557 	KEY_("-", "Decrease size of the focussed split"), \
558 	KEY_("+", "Increase size of the focussed split"), \
559 	KEY_("Tab", "Switch focus between views"), \
560 	KEY_("F", "Toggle fullscreen mode"), \
561 	KEY_("S", "Switch split-screen layout"), \
562 	KEY_("/", "Open prompt to enter search term"), \
563 	KEY_("n", "Find next line/token matching the current search term"), \
564 	KEY_("N", "Find previous line/token matching the current search term"),\
565 	KEY_("q", "Quit the focussed view; Quit help screen"), \
566 	KEY_("Q", "Quit tog"), \
567 	\
568 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
569 	KEY_("< ,", "Move cursor up one commit"), \
570 	KEY_("> .", "Move cursor down one commit"), \
571 	KEY_("Enter", "Open diff view of the selected commit"), \
572 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
573 	KEY_("R", "Open ref view of all repository references"), \
574 	KEY_("T", "Display tree view of the repository from the selected" \
575 	    " commit"), \
576 	KEY_("m", "Mark or unmark the selected entry for diffing with the " \
577 	    "next selected commit"), \
578 	KEY_("@", "Toggle between displaying author and committer name"), \
579 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
580 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
581 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
582 	\
583 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
584 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
585 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
586 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
587 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
588 	    " data"), \
589 	KEY_("p", "Write diff to a patch file in /tmp"), \
590 	KEY_("(", "Go to the previous file in the diff"), \
591 	KEY_(")", "Go to the next file in the diff"), \
592 	KEY_("{", "Go to the previous hunk in the diff"), \
593 	KEY_("}", "Go to the next hunk in the diff"), \
594 	KEY_("[", "Decrease the number of context lines"), \
595 	KEY_("]", "Increase the number of context lines"), \
596 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
597 	\
598 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
599 	KEY_("Enter", "Display diff view of the selected line's commit"), \
600 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
601 	KEY_("L", "Open log view for the currently selected annotated line"), \
602 	KEY_("C", "Reload view with the previously blamed commit"), \
603 	KEY_("c", "Reload view with the version of the file found in the" \
604 	    " selected line's commit"), \
605 	KEY_("p", "Reload view with the version of the file found in the" \
606 	    " selected line's parent commit"), \
607 	\
608 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
609 	KEY_("Enter", "Enter selected directory or open blame view of the" \
610 	    " selected file"), \
611 	KEY_("L", "Open log view for the selected entry"), \
612 	KEY_("R", "Open ref view of all repository references"), \
613 	KEY_("i", "Show object IDs for all tree entries"), \
614 	KEY_("Backspace", "Return to the parent directory"), \
615 	\
616 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
617 	KEY_("Enter", "Display log view of the selected reference"), \
618 	KEY_("T", "Display tree view of the selected reference"), \
619 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
620 	KEY_("m", "Toggle display of last modified date for each reference"), \
621 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
622 	KEY_("C-l", "Reload view with all repository references")
623 
624 struct tog_key_map {
625 	const char		*keys;
626 	const char		*info;
627 	enum tog_keymap_type	 type;
628 };
629 
630 /* curses io for tog regress */
631 struct tog_io {
632 	FILE	*cin;
633 	FILE	*cout;
634 	FILE	*f;
635 	FILE	*sdump;
636 	char	*input_str;
637 	int	 wait_for_ui;
638 } tog_io;
639 static int using_mock_io;
640 
641 #define TOG_KEY_SCRDUMP	SHRT_MIN
642 
643 /*
644  * We implement two types of views: parent views and child views.
645  *
646  * The 'Tab' key switches focus between a parent view and its child view.
647  * Child views are shown side-by-side to their parent view, provided
648  * there is enough screen estate.
649  *
650  * When a new view is opened from within a parent view, this new view
651  * becomes a child view of the parent view, replacing any existing child.
652  *
653  * When a new view is opened from within a child view, this new view
654  * becomes a parent view which will obscure the views below until the
655  * user quits the new parent view by typing 'q'.
656  *
657  * This list of views contains parent views only.
658  * Child views are only pointed to by their parent view.
659  */
660 TAILQ_HEAD(tog_view_list_head, tog_view);
661 
662 struct tog_view {
663 	TAILQ_ENTRY(tog_view) entry;
664 	WINDOW *window;
665 	PANEL *panel;
666 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
667 	int resized_y, resized_x; /* begin_y/x based on user resizing */
668 	int maxx, x; /* max column and current start column */
669 	int lines, cols; /* copies of LINES and COLS */
670 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
671 	int gline, hiline; /* navigate to and highlight this nG line */
672 	int ch, count; /* current keymap and count prefix */
673 	int resized; /* set when in a resize event */
674 	int focussed; /* Only set on one parent or child view at a time. */
675 	int dying;
676 	struct tog_view *parent;
677 	struct tog_view *child;
678 
679 	/*
680 	 * This flag is initially set on parent views when a new child view
681 	 * is created. It gets toggled when the 'Tab' key switches focus
682 	 * between parent and child.
683 	 * The flag indicates whether focus should be passed on to our child
684 	 * view if this parent view gets picked for focus after another parent
685 	 * view was closed. This prevents child views from losing focus in such
686 	 * situations.
687 	 */
688 	int focus_child;
689 
690 	enum tog_view_mode mode;
691 	/* type-specific state */
692 	enum tog_view_type type;
693 	union {
694 		struct tog_diff_view_state diff;
695 		struct tog_log_view_state log;
696 		struct tog_blame_view_state blame;
697 		struct tog_tree_view_state tree;
698 		struct tog_ref_view_state ref;
699 		struct tog_help_view_state help;
700 	} state;
701 
702 	const struct got_error *(*show)(struct tog_view *);
703 	const struct got_error *(*input)(struct tog_view **,
704 	    struct tog_view *, int);
705 	const struct got_error *(*reset)(struct tog_view *);
706 	const struct got_error *(*resize)(struct tog_view *, int);
707 	const struct got_error *(*close)(struct tog_view *);
708 
709 	const struct got_error *(*search_start)(struct tog_view *);
710 	const struct got_error *(*search_next)(struct tog_view *);
711 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
712 	    int **, int **, int **, int **);
713 	int search_started;
714 	int searching;
715 #define TOG_SEARCH_FORWARD	1
716 #define TOG_SEARCH_BACKWARD	2
717 	int search_next_done;
718 #define TOG_SEARCH_HAVE_MORE	1
719 #define TOG_SEARCH_NO_MORE	2
720 #define TOG_SEARCH_HAVE_NONE	3
721 	regex_t regex;
722 	regmatch_t regmatch;
723 	const char *action;
724 };
725 
726 static const struct got_error *open_diff_view(struct tog_view *,
727     struct got_object_id *, struct got_object_id *,
728     const char *, const char *, int, int, int, struct tog_view *,
729     struct got_repository *);
730 static const struct got_error *show_diff_view(struct tog_view *);
731 static const struct got_error *input_diff_view(struct tog_view **,
732     struct tog_view *, int);
733 static const struct got_error *reset_diff_view(struct tog_view *);
734 static const struct got_error* close_diff_view(struct tog_view *);
735 static const struct got_error *search_start_diff_view(struct tog_view *);
736 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
737     size_t *, int **, int **, int **, int **);
738 static const struct got_error *search_next_view_match(struct tog_view *);
739 
740 static const struct got_error *open_log_view(struct tog_view *,
741     struct got_object_id *, struct got_repository *,
742     const char *, const char *, int, struct got_worktree *);
743 static const struct got_error * show_log_view(struct tog_view *);
744 static const struct got_error *input_log_view(struct tog_view **,
745     struct tog_view *, int);
746 static const struct got_error *resize_log_view(struct tog_view *, int);
747 static const struct got_error *close_log_view(struct tog_view *);
748 static const struct got_error *search_start_log_view(struct tog_view *);
749 static const struct got_error *search_next_log_view(struct tog_view *);
750 
751 static const struct got_error *open_blame_view(struct tog_view *, char *,
752     struct got_object_id *, struct got_repository *);
753 static const struct got_error *show_blame_view(struct tog_view *);
754 static const struct got_error *input_blame_view(struct tog_view **,
755     struct tog_view *, int);
756 static const struct got_error *reset_blame_view(struct tog_view *);
757 static const struct got_error *close_blame_view(struct tog_view *);
758 static const struct got_error *search_start_blame_view(struct tog_view *);
759 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
760     size_t *, int **, int **, int **, int **);
761 
762 static const struct got_error *open_tree_view(struct tog_view *,
763     struct got_object_id *, const char *, struct got_repository *);
764 static const struct got_error *show_tree_view(struct tog_view *);
765 static const struct got_error *input_tree_view(struct tog_view **,
766     struct tog_view *, int);
767 static const struct got_error *close_tree_view(struct tog_view *);
768 static const struct got_error *search_start_tree_view(struct tog_view *);
769 static const struct got_error *search_next_tree_view(struct tog_view *);
770 
771 static const struct got_error *open_ref_view(struct tog_view *,
772     struct got_repository *);
773 static const struct got_error *show_ref_view(struct tog_view *);
774 static const struct got_error *input_ref_view(struct tog_view **,
775     struct tog_view *, int);
776 static const struct got_error *close_ref_view(struct tog_view *);
777 static const struct got_error *search_start_ref_view(struct tog_view *);
778 static const struct got_error *search_next_ref_view(struct tog_view *);
779 
780 static const struct got_error *open_help_view(struct tog_view *,
781     struct tog_view *);
782 static const struct got_error *show_help_view(struct tog_view *);
783 static const struct got_error *input_help_view(struct tog_view **,
784     struct tog_view *, int);
785 static const struct got_error *reset_help_view(struct tog_view *);
786 static const struct got_error* close_help_view(struct tog_view *);
787 static const struct got_error *search_start_help_view(struct tog_view *);
788 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
789     size_t *, int **, int **, int **, int **);
790 
791 static volatile sig_atomic_t tog_sigwinch_received;
792 static volatile sig_atomic_t tog_sigpipe_received;
793 static volatile sig_atomic_t tog_sigcont_received;
794 static volatile sig_atomic_t tog_sigint_received;
795 static volatile sig_atomic_t tog_sigterm_received;
796 
797 static void
798 tog_sigwinch(int signo)
799 {
800 	tog_sigwinch_received = 1;
801 }
802 
803 static void
804 tog_sigpipe(int signo)
805 {
806 	tog_sigpipe_received = 1;
807 }
808 
809 static void
810 tog_sigcont(int signo)
811 {
812 	tog_sigcont_received = 1;
813 }
814 
815 static void
816 tog_sigint(int signo)
817 {
818 	tog_sigint_received = 1;
819 }
820 
821 static void
822 tog_sigterm(int signo)
823 {
824 	tog_sigterm_received = 1;
825 }
826 
827 static int
828 tog_fatal_signal_received(void)
829 {
830 	return (tog_sigpipe_received ||
831 	    tog_sigint_received || tog_sigterm_received);
832 }
833 
834 static const struct got_error *
835 view_close(struct tog_view *view)
836 {
837 	const struct got_error *err = NULL, *child_err = NULL;
838 
839 	if (view->child) {
840 		child_err = view_close(view->child);
841 		view->child = NULL;
842 	}
843 	if (view->close)
844 		err = view->close(view);
845 	if (view->panel) {
846 		del_panel(view->panel);
847 		view->panel = NULL;
848 	}
849 	if (view->window) {
850 		delwin(view->window);
851 		view->window = NULL;
852 	}
853 	free(view);
854 	return err ? err : child_err;
855 }
856 
857 static struct tog_view *
858 view_open(int nlines, int ncols, int begin_y, int begin_x,
859     enum tog_view_type type)
860 {
861 	struct tog_view *view = calloc(1, sizeof(*view));
862 
863 	if (view == NULL)
864 		return NULL;
865 
866 	view->type = type;
867 	view->lines = LINES;
868 	view->cols = COLS;
869 	view->nlines = nlines ? nlines : LINES - begin_y;
870 	view->ncols = ncols ? ncols : COLS - begin_x;
871 	view->begin_y = begin_y;
872 	view->begin_x = begin_x;
873 	view->window = newwin(nlines, ncols, begin_y, begin_x);
874 	if (view->window == NULL) {
875 		view_close(view);
876 		return NULL;
877 	}
878 	view->panel = new_panel(view->window);
879 	if (view->panel == NULL ||
880 	    set_panel_userptr(view->panel, view) != OK) {
881 		view_close(view);
882 		return NULL;
883 	}
884 
885 	keypad(view->window, TRUE);
886 	return view;
887 }
888 
889 static int
890 view_split_begin_x(int begin_x)
891 {
892 	if (begin_x > 0 || COLS < 120)
893 		return 0;
894 	return (COLS - MAX(COLS / 2, 80));
895 }
896 
897 /* XXX Stub till we decide what to do. */
898 static int
899 view_split_begin_y(int lines)
900 {
901 	return lines * HSPLIT_SCALE;
902 }
903 
904 static const struct got_error *view_resize(struct tog_view *);
905 
906 static const struct got_error *
907 view_splitscreen(struct tog_view *view)
908 {
909 	const struct got_error *err = NULL;
910 
911 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
912 		if (view->resized_y && view->resized_y < view->lines)
913 			view->begin_y = view->resized_y;
914 		else
915 			view->begin_y = view_split_begin_y(view->nlines);
916 		view->begin_x = 0;
917 	} else if (!view->resized) {
918 		if (view->resized_x && view->resized_x < view->cols - 1 &&
919 		    view->cols > 119)
920 			view->begin_x = view->resized_x;
921 		else
922 			view->begin_x = view_split_begin_x(0);
923 		view->begin_y = 0;
924 	}
925 	view->nlines = LINES - view->begin_y;
926 	view->ncols = COLS - view->begin_x;
927 	view->lines = LINES;
928 	view->cols = COLS;
929 	err = view_resize(view);
930 	if (err)
931 		return err;
932 
933 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
934 		view->parent->nlines = view->begin_y;
935 
936 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
937 		return got_error_from_errno("mvwin");
938 
939 	return NULL;
940 }
941 
942 static const struct got_error *
943 view_fullscreen(struct tog_view *view)
944 {
945 	const struct got_error *err = NULL;
946 
947 	view->begin_x = 0;
948 	view->begin_y = view->resized ? view->begin_y : 0;
949 	view->nlines = view->resized ? view->nlines : LINES;
950 	view->ncols = COLS;
951 	view->lines = LINES;
952 	view->cols = COLS;
953 	err = view_resize(view);
954 	if (err)
955 		return err;
956 
957 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
958 		return got_error_from_errno("mvwin");
959 
960 	return NULL;
961 }
962 
963 static int
964 view_is_parent_view(struct tog_view *view)
965 {
966 	return view->parent == NULL;
967 }
968 
969 static int
970 view_is_splitscreen(struct tog_view *view)
971 {
972 	return view->begin_x > 0 || view->begin_y > 0;
973 }
974 
975 static int
976 view_is_fullscreen(struct tog_view *view)
977 {
978 	return view->nlines == LINES && view->ncols == COLS;
979 }
980 
981 static int
982 view_is_hsplit_top(struct tog_view *view)
983 {
984 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
985 	    view_is_splitscreen(view->child);
986 }
987 
988 static void
989 view_border(struct tog_view *view)
990 {
991 	PANEL *panel;
992 	const struct tog_view *view_above;
993 
994 	if (view->parent)
995 		return view_border(view->parent);
996 
997 	panel = panel_above(view->panel);
998 	if (panel == NULL)
999 		return;
1000 
1001 	view_above = panel_userptr(panel);
1002 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
1003 		mvwhline(view->window, view_above->begin_y - 1,
1004 		    view->begin_x, ACS_HLINE, view->ncols);
1005 	else
1006 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1007 		    ACS_VLINE, view->nlines);
1008 }
1009 
1010 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1011 static const struct got_error *request_log_commits(struct tog_view *);
1012 static const struct got_error *offset_selection_down(struct tog_view *);
1013 static void offset_selection_up(struct tog_view *);
1014 static void view_get_split(struct tog_view *, int *, int *);
1015 
1016 static const struct got_error *
1017 view_resize(struct tog_view *view)
1018 {
1019 	const struct got_error	*err = NULL;
1020 	int			 dif, nlines, ncols;
1021 
1022 	dif = LINES - view->lines;  /* line difference */
1023 
1024 	if (view->lines > LINES)
1025 		nlines = view->nlines - (view->lines - LINES);
1026 	else
1027 		nlines = view->nlines + (LINES - view->lines);
1028 	if (view->cols > COLS)
1029 		ncols = view->ncols - (view->cols - COLS);
1030 	else
1031 		ncols = view->ncols + (COLS - view->cols);
1032 
1033 	if (view->child) {
1034 		int hs = view->child->begin_y;
1035 
1036 		if (!view_is_fullscreen(view))
1037 			view->child->begin_x = view_split_begin_x(view->begin_x);
1038 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1039 		    view->child->begin_x == 0) {
1040 			ncols = COLS;
1041 
1042 			view_fullscreen(view->child);
1043 			if (view->child->focussed)
1044 				show_panel(view->child->panel);
1045 			else
1046 				show_panel(view->panel);
1047 		} else {
1048 			ncols = view->child->begin_x;
1049 
1050 			view_splitscreen(view->child);
1051 			show_panel(view->child->panel);
1052 		}
1053 		/*
1054 		 * XXX This is ugly and needs to be moved into the above
1055 		 * logic but "works" for now and my attempts at moving it
1056 		 * break either 'tab' or 'F' key maps in horizontal splits.
1057 		 */
1058 		if (hs) {
1059 			err = view_splitscreen(view->child);
1060 			if (err)
1061 				return err;
1062 			if (dif < 0) { /* top split decreased */
1063 				err = offset_selection_down(view);
1064 				if (err)
1065 					return err;
1066 			}
1067 			view_border(view);
1068 			update_panels();
1069 			doupdate();
1070 			show_panel(view->child->panel);
1071 			nlines = view->nlines;
1072 		}
1073 	} else if (view->parent == NULL)
1074 		ncols = COLS;
1075 
1076 	if (view->resize && dif > 0) {
1077 		err = view->resize(view, dif);
1078 		if (err)
1079 			return err;
1080 	}
1081 
1082 	if (wresize(view->window, nlines, ncols) == ERR)
1083 		return got_error_from_errno("wresize");
1084 	if (replace_panel(view->panel, view->window) == ERR)
1085 		return got_error_from_errno("replace_panel");
1086 	wclear(view->window);
1087 
1088 	view->nlines = nlines;
1089 	view->ncols = ncols;
1090 	view->lines = LINES;
1091 	view->cols = COLS;
1092 
1093 	return NULL;
1094 }
1095 
1096 static const struct got_error *
1097 resize_log_view(struct tog_view *view, int increase)
1098 {
1099 	struct tog_log_view_state	*s = &view->state.log;
1100 	const struct got_error		*err = NULL;
1101 	int				 n = 0;
1102 
1103 	if (s->selected_entry)
1104 		n = s->selected_entry->idx + view->lines - s->selected;
1105 
1106 	/*
1107 	 * Request commits to account for the increased
1108 	 * height so we have enough to populate the view.
1109 	 */
1110 	if (s->commits->ncommits < n) {
1111 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1112 		err = request_log_commits(view);
1113 	}
1114 
1115 	return err;
1116 }
1117 
1118 static void
1119 view_adjust_offset(struct tog_view *view, int n)
1120 {
1121 	if (n == 0)
1122 		return;
1123 
1124 	if (view->parent && view->parent->offset) {
1125 		if (view->parent->offset + n >= 0)
1126 			view->parent->offset += n;
1127 		else
1128 			view->parent->offset = 0;
1129 	} else if (view->offset) {
1130 		if (view->offset - n >= 0)
1131 			view->offset -= n;
1132 		else
1133 			view->offset = 0;
1134 	}
1135 }
1136 
1137 static const struct got_error *
1138 view_resize_split(struct tog_view *view, int resize)
1139 {
1140 	const struct got_error	*err = NULL;
1141 	struct tog_view		*v = NULL;
1142 
1143 	if (view->parent)
1144 		v = view->parent;
1145 	else
1146 		v = view;
1147 
1148 	if (!v->child || !view_is_splitscreen(v->child))
1149 		return NULL;
1150 
1151 	v->resized = v->child->resized = resize;  /* lock for resize event */
1152 
1153 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1154 		if (v->child->resized_y)
1155 			v->child->begin_y = v->child->resized_y;
1156 		if (view->parent)
1157 			v->child->begin_y -= resize;
1158 		else
1159 			v->child->begin_y += resize;
1160 		if (v->child->begin_y < 3) {
1161 			view->count = 0;
1162 			v->child->begin_y = 3;
1163 		} else if (v->child->begin_y > LINES - 1) {
1164 			view->count = 0;
1165 			v->child->begin_y = LINES - 1;
1166 		}
1167 		v->ncols = COLS;
1168 		v->child->ncols = COLS;
1169 		view_adjust_offset(view, resize);
1170 		err = view_init_hsplit(v, v->child->begin_y);
1171 		if (err)
1172 			return err;
1173 		v->child->resized_y = v->child->begin_y;
1174 	} else {
1175 		if (v->child->resized_x)
1176 			v->child->begin_x = v->child->resized_x;
1177 		if (view->parent)
1178 			v->child->begin_x -= resize;
1179 		else
1180 			v->child->begin_x += resize;
1181 		if (v->child->begin_x < 11) {
1182 			view->count = 0;
1183 			v->child->begin_x = 11;
1184 		} else if (v->child->begin_x > COLS - 1) {
1185 			view->count = 0;
1186 			v->child->begin_x = COLS - 1;
1187 		}
1188 		v->child->resized_x = v->child->begin_x;
1189 	}
1190 
1191 	v->child->mode = v->mode;
1192 	v->child->nlines = v->lines - v->child->begin_y;
1193 	v->child->ncols = v->cols - v->child->begin_x;
1194 	v->focus_child = 1;
1195 
1196 	err = view_fullscreen(v);
1197 	if (err)
1198 		return err;
1199 	err = view_splitscreen(v->child);
1200 	if (err)
1201 		return err;
1202 
1203 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1204 		err = offset_selection_down(v->child);
1205 		if (err)
1206 			return err;
1207 	}
1208 
1209 	if (v->resize)
1210 		err = v->resize(v, 0);
1211 	else if (v->child->resize)
1212 		err = v->child->resize(v->child, 0);
1213 
1214 	v->resized = v->child->resized = 0;
1215 
1216 	return err;
1217 }
1218 
1219 static void
1220 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1221 {
1222 	struct tog_view *v = src->child ? src->child : src;
1223 
1224 	dst->resized_x = v->resized_x;
1225 	dst->resized_y = v->resized_y;
1226 }
1227 
1228 static const struct got_error *
1229 view_close_child(struct tog_view *view)
1230 {
1231 	const struct got_error *err = NULL;
1232 
1233 	if (view->child == NULL)
1234 		return NULL;
1235 
1236 	err = view_close(view->child);
1237 	view->child = NULL;
1238 	return err;
1239 }
1240 
1241 static const struct got_error *
1242 view_set_child(struct tog_view *view, struct tog_view *child)
1243 {
1244 	const struct got_error *err = NULL;
1245 
1246 	view->child = child;
1247 	child->parent = view;
1248 
1249 	err = view_resize(view);
1250 	if (err)
1251 		return err;
1252 
1253 	if (view->child->resized_x || view->child->resized_y)
1254 		err = view_resize_split(view, 0);
1255 
1256 	return err;
1257 }
1258 
1259 static const struct got_error *view_dispatch_request(struct tog_view **,
1260     struct tog_view *, enum tog_view_type, int, int);
1261 
1262 static const struct got_error *
1263 view_request_new(struct tog_view **requested, struct tog_view *view,
1264     enum tog_view_type request)
1265 {
1266 	struct tog_view		*new_view = NULL;
1267 	const struct got_error	*err;
1268 	int			 y = 0, x = 0;
1269 
1270 	*requested = NULL;
1271 
1272 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1273 		view_get_split(view, &y, &x);
1274 
1275 	err = view_dispatch_request(&new_view, view, request, y, x);
1276 	if (err)
1277 		return err;
1278 
1279 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1280 	    request != TOG_VIEW_HELP) {
1281 		err = view_init_hsplit(view, y);
1282 		if (err)
1283 			return err;
1284 	}
1285 
1286 	view->focussed = 0;
1287 	new_view->focussed = 1;
1288 	new_view->mode = view->mode;
1289 	new_view->nlines = request == TOG_VIEW_HELP ?
1290 	    view->lines : view->lines - y;
1291 
1292 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1293 		view_transfer_size(new_view, view);
1294 		err = view_close_child(view);
1295 		if (err)
1296 			return err;
1297 		err = view_set_child(view, new_view);
1298 		if (err)
1299 			return err;
1300 		view->focus_child = 1;
1301 	} else
1302 		*requested = new_view;
1303 
1304 	return NULL;
1305 }
1306 
1307 static void
1308 tog_resizeterm(void)
1309 {
1310 	int cols, lines;
1311 	struct winsize size;
1312 
1313 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1314 		cols = 80;     /* Default */
1315 		lines = 24;
1316 	} else {
1317 		cols = size.ws_col;
1318 		lines = size.ws_row;
1319 	}
1320 	resize_term(lines, cols);
1321 }
1322 
1323 static const struct got_error *
1324 view_search_start(struct tog_view *view, int fast_refresh)
1325 {
1326 	const struct got_error *err = NULL;
1327 	struct tog_view *v = view;
1328 	char pattern[1024];
1329 	int ret;
1330 
1331 	if (view->search_started) {
1332 		regfree(&view->regex);
1333 		view->searching = 0;
1334 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1335 	}
1336 	view->search_started = 0;
1337 
1338 	if (view->nlines < 1)
1339 		return NULL;
1340 
1341 	if (view_is_hsplit_top(view))
1342 		v = view->child;
1343 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1344 		v = view->parent;
1345 
1346 	if (tog_io.input_str != NULL) {
1347 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
1348 		    sizeof(pattern))
1349 			return got_error(GOT_ERR_NO_SPACE);
1350 	} else {
1351 		mvwaddstr(v->window, v->nlines - 1, 0, "/");
1352 		wclrtoeol(v->window);
1353 		nodelay(v->window, FALSE);  /* block for search term input */
1354 		nocbreak();
1355 		echo();
1356 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
1357 		wrefresh(v->window);
1358 		cbreak();
1359 		noecho();
1360 		nodelay(v->window, TRUE);
1361 		if (!fast_refresh && !using_mock_io)
1362 			halfdelay(10);
1363 		if (ret == ERR)
1364 			return NULL;
1365 	}
1366 
1367 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1368 		err = view->search_start(view);
1369 		if (err) {
1370 			regfree(&view->regex);
1371 			return err;
1372 		}
1373 		view->search_started = 1;
1374 		view->searching = TOG_SEARCH_FORWARD;
1375 		view->search_next_done = 0;
1376 		view->search_next(view);
1377 	}
1378 
1379 	return NULL;
1380 }
1381 
1382 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1383 static const struct got_error *
1384 switch_split(struct tog_view *view)
1385 {
1386 	const struct got_error	*err = NULL;
1387 	struct tog_view		*v = NULL;
1388 
1389 	if (view->parent)
1390 		v = view->parent;
1391 	else
1392 		v = view;
1393 
1394 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1395 		v->mode = TOG_VIEW_SPLIT_VERT;
1396 	else
1397 		v->mode = TOG_VIEW_SPLIT_HRZN;
1398 
1399 	if (!v->child)
1400 		return NULL;
1401 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1402 		v->mode = TOG_VIEW_SPLIT_NONE;
1403 
1404 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1405 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1406 		v->child->begin_y = v->child->resized_y;
1407 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1408 		v->child->begin_x = v->child->resized_x;
1409 
1410 
1411 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1412 		v->ncols = COLS;
1413 		v->child->ncols = COLS;
1414 		v->child->nscrolled = LINES - v->child->nlines;
1415 
1416 		err = view_init_hsplit(v, v->child->begin_y);
1417 		if (err)
1418 			return err;
1419 	}
1420 	v->child->mode = v->mode;
1421 	v->child->nlines = v->lines - v->child->begin_y;
1422 	v->focus_child = 1;
1423 
1424 	err = view_fullscreen(v);
1425 	if (err)
1426 		return err;
1427 	err = view_splitscreen(v->child);
1428 	if (err)
1429 		return err;
1430 
1431 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1432 		v->mode = TOG_VIEW_SPLIT_VERT;
1433 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1434 		err = offset_selection_down(v);
1435 		if (err)
1436 			return err;
1437 		err = offset_selection_down(v->child);
1438 		if (err)
1439 			return err;
1440 	} else {
1441 		offset_selection_up(v);
1442 		offset_selection_up(v->child);
1443 	}
1444 	if (v->resize)
1445 		err = v->resize(v, 0);
1446 	else if (v->child->resize)
1447 		err = v->child->resize(v->child, 0);
1448 
1449 	return err;
1450 }
1451 
1452 /*
1453  * Strip trailing whitespace from str starting at byte *n;
1454  * if *n < 0, use strlen(str). Return new str length in *n.
1455  */
1456 static void
1457 strip_trailing_ws(char *str, int *n)
1458 {
1459 	size_t x = *n;
1460 
1461 	if (str == NULL || *str == '\0')
1462 		return;
1463 
1464 	if (x < 0)
1465 		x = strlen(str);
1466 
1467 	while (x-- > 0 && isspace((unsigned char)str[x]))
1468 		str[x] = '\0';
1469 
1470 	*n = x + 1;
1471 }
1472 
1473 /*
1474  * Extract visible substring of line y from the curses screen
1475  * and strip trailing whitespace. If vline is set, overwrite
1476  * line[vline] with '|' because the ACS_VLINE character is
1477  * written out as 'x'. Write the line to file f.
1478  */
1479 static const struct got_error *
1480 view_write_line(FILE *f, int y, int vline)
1481 {
1482 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1483 	int	r, w;
1484 
1485 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1486 	if (r == ERR)
1487 		return got_error_fmt(GOT_ERR_RANGE,
1488 		    "failed to extract line %d", y);
1489 
1490 	/*
1491 	 * In some views, lines are padded with blanks to COLS width.
1492 	 * Strip them so we can diff without the -b flag when testing.
1493 	 */
1494 	strip_trailing_ws(line, &r);
1495 
1496 	if (vline > 0)
1497 		line[vline] = '|';
1498 
1499 	w = fprintf(f, "%s\n", line);
1500 	if (w != r + 1)		/* \n */
1501 		return got_ferror(f, GOT_ERR_IO);
1502 
1503 	return NULL;
1504 }
1505 
1506 /*
1507  * Capture the visible curses screen by writing each line to the
1508  * file at the path set via the TOG_SCR_DUMP environment variable.
1509  */
1510 static const struct got_error *
1511 screendump(struct tog_view *view)
1512 {
1513 	const struct got_error	*err;
1514 	int			 i;
1515 
1516 	err = got_opentemp_truncate(tog_io.sdump);
1517 	if (err)
1518 		return err;
1519 
1520 	if ((view->child && view->child->begin_x) ||
1521 	    (view->parent && view->begin_x)) {
1522 		int ncols = view->child ? view->ncols : view->parent->ncols;
1523 
1524 		/* vertical splitscreen */
1525 		for (i = 0; i < view->nlines; ++i) {
1526 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1527 			if (err)
1528 				goto done;
1529 		}
1530 	} else {
1531 		int hline = 0;
1532 
1533 		/* fullscreen or horizontal splitscreen */
1534 		if ((view->child && view->child->begin_y) ||
1535 		    (view->parent && view->begin_y))	/* hsplit */
1536 			hline = view->child ?
1537 			    view->child->begin_y : view->begin_y;
1538 
1539 		for (i = 0; i < view->lines; i++) {
1540 			if (hline && i == hline - 1) {
1541 				int c;
1542 
1543 				/* ACS_HLINE writes out as 'q', overwrite it */
1544 				for (c = 0; c < view->cols; ++c)
1545 					fputc('-', tog_io.sdump);
1546 				fputc('\n', tog_io.sdump);
1547 				continue;
1548 			}
1549 
1550 			err = view_write_line(tog_io.sdump, i, 0);
1551 			if (err)
1552 				goto done;
1553 		}
1554 	}
1555 
1556 done:
1557 	return err;
1558 }
1559 
1560 /*
1561  * Compute view->count from numeric input. Assign total to view->count and
1562  * return first non-numeric key entered.
1563  */
1564 static int
1565 get_compound_key(struct tog_view *view, int c)
1566 {
1567 	struct tog_view	*v = view;
1568 	int		 x, n = 0;
1569 
1570 	if (view_is_hsplit_top(view))
1571 		v = view->child;
1572 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1573 		v = view->parent;
1574 
1575 	view->count = 0;
1576 	cbreak();  /* block for input */
1577 	nodelay(view->window, FALSE);
1578 	wmove(v->window, v->nlines - 1, 0);
1579 	wclrtoeol(v->window);
1580 	waddch(v->window, ':');
1581 
1582 	do {
1583 		x = getcurx(v->window);
1584 		if (x != ERR && x < view->ncols) {
1585 			waddch(v->window, c);
1586 			wrefresh(v->window);
1587 		}
1588 
1589 		/*
1590 		 * Don't overflow. Max valid request should be the greatest
1591 		 * between the longest and total lines; cap at 10 million.
1592 		 */
1593 		if (n >= 9999999)
1594 			n = 9999999;
1595 		else
1596 			n = n * 10 + (c - '0');
1597 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1598 
1599 	if (c == 'G' || c == 'g') {	/* nG key map */
1600 		view->gline = view->hiline = n;
1601 		n = 0;
1602 		c = 0;
1603 	}
1604 
1605 	/* Massage excessive or inapplicable values at the input handler. */
1606 	view->count = n;
1607 
1608 	return c;
1609 }
1610 
1611 static void
1612 action_report(struct tog_view *view)
1613 {
1614 	struct tog_view *v = view;
1615 
1616 	if (view_is_hsplit_top(view))
1617 		v = view->child;
1618 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1619 		v = view->parent;
1620 
1621 	wmove(v->window, v->nlines - 1, 0);
1622 	wclrtoeol(v->window);
1623 	wprintw(v->window, ":%s", view->action);
1624 	wrefresh(v->window);
1625 
1626 	/*
1627 	 * Clear action status report. Only clear in blame view
1628 	 * once annotating is complete, otherwise it's too fast.
1629 	 * In diff view, let its state control view->action lifetime.
1630 	 */
1631 	if (view->type == TOG_VIEW_BLAME) {
1632 		if (view->state.blame.blame_complete)
1633 			view->action = NULL;
1634 	} else if (view->type == TOG_VIEW_DIFF) {
1635 		view->action = view->state.diff.action;
1636 	} else
1637 		view->action = NULL;
1638 }
1639 
1640 /*
1641  * Read the next line from the test script and assign
1642  * key instruction to *ch. If at EOF, set the *done flag.
1643  */
1644 static const struct got_error *
1645 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1646 {
1647 	const struct got_error	*err = NULL;
1648 	char			*line = NULL;
1649 	size_t			 linesz = 0;
1650 	ssize_t			 n;
1651 
1652 
1653 	if (view->count && --view->count) {
1654 		*ch = view->ch;
1655 		return NULL;
1656 	} else
1657 		*ch = -1;
1658 
1659 	if ((n = getline(&line, &linesz, script)) == -1) {
1660 		if (feof(script)) {
1661 			*done = 1;
1662 			goto done;
1663 		} else {
1664 			err = got_ferror(script, GOT_ERR_IO);
1665 			goto done;
1666 		}
1667 	}
1668 
1669 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1670 		tog_io.wait_for_ui = 1;
1671 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1672 		*ch = KEY_ENTER;
1673 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1674 		*ch = KEY_RIGHT;
1675 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1676 		*ch = KEY_LEFT;
1677 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1678 		*ch = KEY_DOWN;
1679 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1680 		*ch = KEY_UP;
1681 	else if (strncasecmp(line, "TAB", 3) == 0)
1682 		*ch = '\t';
1683 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1684 		*ch = TOG_KEY_SCRDUMP;
1685 	else if (isdigit((unsigned char)*line)) {
1686 		char *t = line;
1687 
1688 		while (isdigit((unsigned char)*t))
1689 			++t;
1690 		view->ch = *ch = *t;
1691 		*t = '\0';
1692 		/* ignore error, view->count is 0 if instruction is invalid */
1693 		view->count = strtonum(line, 0, INT_MAX, NULL);
1694 	} else {
1695 		*ch = *line;
1696 		if (n > 2 && (*ch == '/' || *ch == '&')) {
1697 			/* skip leading keymap and trim trailing newline */
1698 			tog_io.input_str = strndup(line + 1, n - 2);
1699 			if (tog_io.input_str == NULL) {
1700 				err = got_error_from_errno("strndup");
1701 				goto done;
1702 			}
1703 		}
1704 	}
1705 
1706 done:
1707 	free(line);
1708 	return err;
1709 }
1710 
1711 static void
1712 log_mark_clear(struct tog_log_view_state *s)
1713 {
1714 	s->marked_entry = NULL;
1715 }
1716 
1717 static const struct got_error *
1718 view_input(struct tog_view **new, int *done, struct tog_view *view,
1719     struct tog_view_list_head *views, int fast_refresh)
1720 {
1721 	const struct got_error *err = NULL;
1722 	struct tog_view *v;
1723 	int ch, errcode;
1724 
1725 	*new = NULL;
1726 
1727 	if (view->action)
1728 		action_report(view);
1729 
1730 	/* Clear "no matches" indicator. */
1731 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1732 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1733 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1734 		view->count = 0;
1735 	}
1736 
1737 	if (view->searching && !view->search_next_done) {
1738 		errcode = pthread_mutex_unlock(&tog_mutex);
1739 		if (errcode)
1740 			return got_error_set_errno(errcode,
1741 			    "pthread_mutex_unlock");
1742 		sched_yield();
1743 		errcode = pthread_mutex_lock(&tog_mutex);
1744 		if (errcode)
1745 			return got_error_set_errno(errcode,
1746 			    "pthread_mutex_lock");
1747 		view->search_next(view);
1748 		return NULL;
1749 	}
1750 
1751 	/* Allow threads to make progress while we are waiting for input. */
1752 	errcode = pthread_mutex_unlock(&tog_mutex);
1753 	if (errcode)
1754 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1755 
1756 	if (using_mock_io) {
1757 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1758 		if (err) {
1759 			errcode = pthread_mutex_lock(&tog_mutex);
1760 			return err;
1761 		}
1762 	} else if (view->count && --view->count) {
1763 		cbreak();
1764 		nodelay(view->window, TRUE);
1765 		ch = wgetch(view->window);
1766 		/* let C-g or backspace abort unfinished count */
1767 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1768 			view->count = 0;
1769 		else
1770 			ch = view->ch;
1771 	} else {
1772 		ch = wgetch(view->window);
1773 		if (ch >= '1' && ch  <= '9')
1774 			view->ch = ch = get_compound_key(view, ch);
1775 	}
1776 	if (view->hiline && ch != ERR && ch != 0)
1777 		view->hiline = 0;  /* key pressed, clear line highlight */
1778 	nodelay(view->window, TRUE);
1779 	errcode = pthread_mutex_lock(&tog_mutex);
1780 	if (errcode)
1781 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1782 
1783 	if (tog_sigwinch_received || tog_sigcont_received) {
1784 		tog_resizeterm();
1785 		tog_sigwinch_received = 0;
1786 		tog_sigcont_received = 0;
1787 		TAILQ_FOREACH(v, views, entry) {
1788 			err = view_resize(v);
1789 			if (err)
1790 				return err;
1791 			err = v->input(new, v, KEY_RESIZE);
1792 			if (err)
1793 				return err;
1794 			if (v->child) {
1795 				err = view_resize(v->child);
1796 				if (err)
1797 					return err;
1798 				err = v->child->input(new, v->child,
1799 				    KEY_RESIZE);
1800 				if (err)
1801 					return err;
1802 				if (v->child->resized_x || v->child->resized_y) {
1803 					err = view_resize_split(v, 0);
1804 					if (err)
1805 						return err;
1806 				}
1807 			}
1808 		}
1809 	}
1810 
1811 	switch (ch) {
1812 	case '?':
1813 	case 'H':
1814 	case KEY_F(1):
1815 		if (view->type == TOG_VIEW_HELP)
1816 			err = view->reset(view);
1817 		else
1818 			err = view_request_new(new, view, TOG_VIEW_HELP);
1819 		break;
1820 	case '\t':
1821 		view->count = 0;
1822 		if (view->child) {
1823 			view->focussed = 0;
1824 			view->child->focussed = 1;
1825 			view->focus_child = 1;
1826 		} else if (view->parent) {
1827 			view->focussed = 0;
1828 			view->parent->focussed = 1;
1829 			view->parent->focus_child = 0;
1830 			if (!view_is_splitscreen(view)) {
1831 				if (view->parent->resize) {
1832 					err = view->parent->resize(view->parent,
1833 					    0);
1834 					if (err)
1835 						return err;
1836 				}
1837 				offset_selection_up(view->parent);
1838 				err = view_fullscreen(view->parent);
1839 				if (err)
1840 					return err;
1841 			}
1842 		}
1843 		break;
1844 	case 'q':
1845 		if (view->parent != NULL) {
1846 			if (view->parent->type == TOG_VIEW_LOG)
1847 				log_mark_clear(&view->parent->state.log);
1848 
1849 			if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1850 				if (view->parent->resize) {
1851 					/*
1852 					 * Might need more commits
1853 					 * to fill fullscreen.
1854 					 */
1855 					err = view->parent->resize(
1856 					    view->parent, 0);
1857 					if (err)
1858 						break;
1859 				}
1860 				offset_selection_up(view->parent);
1861 			}
1862 		}
1863 		err = view->input(new, view, ch);
1864 		view->dying = 1;
1865 		break;
1866 	case 'Q':
1867 		*done = 1;
1868 		break;
1869 	case 'F':
1870 		view->count = 0;
1871 		if (view_is_parent_view(view)) {
1872 			if (view->child == NULL)
1873 				break;
1874 			if (view_is_splitscreen(view->child)) {
1875 				view->focussed = 0;
1876 				view->child->focussed = 1;
1877 				err = view_fullscreen(view->child);
1878 			} else {
1879 				err = view_splitscreen(view->child);
1880 				if (!err)
1881 					err = view_resize_split(view, 0);
1882 			}
1883 			if (err)
1884 				break;
1885 			err = view->child->input(new, view->child,
1886 			    KEY_RESIZE);
1887 		} else {
1888 			if (view_is_splitscreen(view)) {
1889 				view->parent->focussed = 0;
1890 				view->focussed = 1;
1891 				err = view_fullscreen(view);
1892 			} else {
1893 				err = view_splitscreen(view);
1894 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1895 					err = view_resize(view->parent);
1896 				if (!err)
1897 					err = view_resize_split(view, 0);
1898 			}
1899 			if (err)
1900 				break;
1901 			err = view->input(new, view, KEY_RESIZE);
1902 		}
1903 		if (err)
1904 			break;
1905 		if (view->resize) {
1906 			err = view->resize(view, 0);
1907 			if (err)
1908 				break;
1909 		}
1910 		if (view->parent) {
1911 			if (view->parent->resize) {
1912 				err = view->parent->resize(view->parent, 0);
1913 				if (err != NULL)
1914 					break;
1915 			}
1916 			err = offset_selection_down(view->parent);
1917 			if (err != NULL)
1918 				break;
1919 		}
1920 		err = offset_selection_down(view);
1921 		break;
1922 	case 'S':
1923 		view->count = 0;
1924 		err = switch_split(view);
1925 		break;
1926 	case '-':
1927 		err = view_resize_split(view, -1);
1928 		break;
1929 	case '+':
1930 		err = view_resize_split(view, 1);
1931 		break;
1932 	case KEY_RESIZE:
1933 		break;
1934 	case '/':
1935 		view->count = 0;
1936 		if (view->search_start)
1937 			view_search_start(view, fast_refresh);
1938 		else
1939 			err = view->input(new, view, ch);
1940 		break;
1941 	case 'N':
1942 	case 'n':
1943 		if (view->search_started && view->search_next) {
1944 			view->searching = (ch == 'n' ?
1945 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1946 			view->search_next_done = 0;
1947 			view->search_next(view);
1948 		} else
1949 			err = view->input(new, view, ch);
1950 		break;
1951 	case 'A':
1952 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1953 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1954 			view->action = "Patience diff algorithm";
1955 		} else {
1956 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1957 			view->action = "Myers diff algorithm";
1958 		}
1959 		TAILQ_FOREACH(v, views, entry) {
1960 			if (v->reset) {
1961 				err = v->reset(v);
1962 				if (err)
1963 					return err;
1964 			}
1965 			if (v->child && v->child->reset) {
1966 				err = v->child->reset(v->child);
1967 				if (err)
1968 					return err;
1969 			}
1970 		}
1971 		break;
1972 	case TOG_KEY_SCRDUMP:
1973 		err = screendump(view);
1974 		break;
1975 	default:
1976 		err = view->input(new, view, ch);
1977 		break;
1978 	}
1979 
1980 	return err;
1981 }
1982 
1983 static int
1984 view_needs_focus_indication(struct tog_view *view)
1985 {
1986 	if (view_is_parent_view(view)) {
1987 		if (view->child == NULL || view->child->focussed)
1988 			return 0;
1989 		if (!view_is_splitscreen(view->child))
1990 			return 0;
1991 	} else if (!view_is_splitscreen(view))
1992 		return 0;
1993 
1994 	return view->focussed;
1995 }
1996 
1997 static const struct got_error *
1998 tog_io_close(void)
1999 {
2000 	const struct got_error *err = NULL;
2001 
2002 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
2003 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
2004 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
2005 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
2006 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
2007 		err = got_ferror(tog_io.f, GOT_ERR_IO);
2008 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
2009 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
2010 	if (tog_io.input_str != NULL)
2011 		free(tog_io.input_str);
2012 
2013 	return err;
2014 }
2015 
2016 static const struct got_error *
2017 view_loop(struct tog_view *view)
2018 {
2019 	const struct got_error *err = NULL;
2020 	struct tog_view_list_head views;
2021 	struct tog_view *new_view;
2022 	char *mode;
2023 	int fast_refresh = 10;
2024 	int done = 0, errcode;
2025 
2026 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2027 	if (!mode || !(*mode == 'h' || *mode == 'H'))
2028 		view->mode = TOG_VIEW_SPLIT_VERT;
2029 	else
2030 		view->mode = TOG_VIEW_SPLIT_HRZN;
2031 
2032 	errcode = pthread_mutex_lock(&tog_mutex);
2033 	if (errcode)
2034 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2035 
2036 	TAILQ_INIT(&views);
2037 	TAILQ_INSERT_HEAD(&views, view, entry);
2038 
2039 	view->focussed = 1;
2040 	err = view->show(view);
2041 	if (err)
2042 		return err;
2043 	update_panels();
2044 	doupdate();
2045 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2046 	    !tog_fatal_signal_received()) {
2047 		/* Refresh fast during initialization, then become slower. */
2048 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2049 			halfdelay(10); /* switch to once per second */
2050 
2051 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2052 		if (err)
2053 			break;
2054 
2055 		if (view->dying && view == TAILQ_FIRST(&views) &&
2056 		    TAILQ_NEXT(view, entry) == NULL)
2057 			done = 1;
2058 		if (done) {
2059 			struct tog_view *v;
2060 
2061 			/*
2062 			 * When we quit, scroll the screen up a single line
2063 			 * so we don't lose any information.
2064 			 */
2065 			TAILQ_FOREACH(v, &views, entry) {
2066 				wmove(v->window, 0, 0);
2067 				wdeleteln(v->window);
2068 				wnoutrefresh(v->window);
2069 				if (v->child && !view_is_fullscreen(v)) {
2070 					wmove(v->child->window, 0, 0);
2071 					wdeleteln(v->child->window);
2072 					wnoutrefresh(v->child->window);
2073 				}
2074 			}
2075 			doupdate();
2076 		}
2077 
2078 		if (view->dying) {
2079 			struct tog_view *v, *prev = NULL;
2080 
2081 			if (view_is_parent_view(view))
2082 				prev = TAILQ_PREV(view, tog_view_list_head,
2083 				    entry);
2084 			else if (view->parent)
2085 				prev = view->parent;
2086 
2087 			if (view->parent) {
2088 				view->parent->child = NULL;
2089 				view->parent->focus_child = 0;
2090 				/* Restore fullscreen line height. */
2091 				view->parent->nlines = view->parent->lines;
2092 				err = view_resize(view->parent);
2093 				if (err)
2094 					break;
2095 				/* Make resized splits persist. */
2096 				view_transfer_size(view->parent, view);
2097 			} else
2098 				TAILQ_REMOVE(&views, view, entry);
2099 
2100 			err = view_close(view);
2101 			if (err)
2102 				goto done;
2103 
2104 			view = NULL;
2105 			TAILQ_FOREACH(v, &views, entry) {
2106 				if (v->focussed)
2107 					break;
2108 			}
2109 			if (view == NULL && new_view == NULL) {
2110 				/* No view has focus. Try to pick one. */
2111 				if (prev)
2112 					view = prev;
2113 				else if (!TAILQ_EMPTY(&views)) {
2114 					view = TAILQ_LAST(&views,
2115 					    tog_view_list_head);
2116 				}
2117 				if (view) {
2118 					if (view->focus_child) {
2119 						view->child->focussed = 1;
2120 						view = view->child;
2121 					} else
2122 						view->focussed = 1;
2123 				}
2124 			}
2125 		}
2126 		if (new_view) {
2127 			struct tog_view *v, *t;
2128 			/* Only allow one parent view per type. */
2129 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2130 				if (v->type != new_view->type)
2131 					continue;
2132 				TAILQ_REMOVE(&views, v, entry);
2133 				err = view_close(v);
2134 				if (err)
2135 					goto done;
2136 				break;
2137 			}
2138 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2139 			view = new_view;
2140 		}
2141 		if (view && !done) {
2142 			if (view_is_parent_view(view)) {
2143 				if (view->child && view->child->focussed)
2144 					view = view->child;
2145 			} else {
2146 				if (view->parent && view->parent->focussed)
2147 					view = view->parent;
2148 			}
2149 			show_panel(view->panel);
2150 			if (view->child && view_is_splitscreen(view->child))
2151 				show_panel(view->child->panel);
2152 			if (view->parent && view_is_splitscreen(view)) {
2153 				err = view->parent->show(view->parent);
2154 				if (err)
2155 					goto done;
2156 			}
2157 			err = view->show(view);
2158 			if (err)
2159 				goto done;
2160 			if (view->child) {
2161 				err = view->child->show(view->child);
2162 				if (err)
2163 					goto done;
2164 			}
2165 			update_panels();
2166 			doupdate();
2167 		}
2168 	}
2169 done:
2170 	while (!TAILQ_EMPTY(&views)) {
2171 		const struct got_error *close_err;
2172 		view = TAILQ_FIRST(&views);
2173 		TAILQ_REMOVE(&views, view, entry);
2174 		close_err = view_close(view);
2175 		if (close_err && err == NULL)
2176 			err = close_err;
2177 	}
2178 
2179 	errcode = pthread_mutex_unlock(&tog_mutex);
2180 	if (errcode && err == NULL)
2181 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2182 
2183 	return err;
2184 }
2185 
2186 __dead static void
2187 usage_log(void)
2188 {
2189 	endwin();
2190 	fprintf(stderr,
2191 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2192 	    getprogname());
2193 	exit(1);
2194 }
2195 
2196 /* Create newly allocated wide-character string equivalent to a byte string. */
2197 static const struct got_error *
2198 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2199 {
2200 	char *vis = NULL;
2201 	const struct got_error *err = NULL;
2202 
2203 	*ws = NULL;
2204 	*wlen = mbstowcs(NULL, s, 0);
2205 	if (*wlen == (size_t)-1) {
2206 		int vislen;
2207 		if (errno != EILSEQ)
2208 			return got_error_from_errno("mbstowcs");
2209 
2210 		/* byte string invalid in current encoding; try to "fix" it */
2211 		err = got_mbsavis(&vis, &vislen, s);
2212 		if (err)
2213 			return err;
2214 		*wlen = mbstowcs(NULL, vis, 0);
2215 		if (*wlen == (size_t)-1) {
2216 			err = got_error_from_errno("mbstowcs"); /* give up */
2217 			goto done;
2218 		}
2219 	}
2220 
2221 	*ws = calloc(*wlen + 1, sizeof(**ws));
2222 	if (*ws == NULL) {
2223 		err = got_error_from_errno("calloc");
2224 		goto done;
2225 	}
2226 
2227 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2228 		err = got_error_from_errno("mbstowcs");
2229 done:
2230 	free(vis);
2231 	if (err) {
2232 		free(*ws);
2233 		*ws = NULL;
2234 		*wlen = 0;
2235 	}
2236 	return err;
2237 }
2238 
2239 static const struct got_error *
2240 expand_tab(char **ptr, const char *src)
2241 {
2242 	char	*dst;
2243 	size_t	 len, n, idx = 0, sz = 0;
2244 
2245 	*ptr = NULL;
2246 	n = len = strlen(src);
2247 	dst = malloc(n + 1);
2248 	if (dst == NULL)
2249 		return got_error_from_errno("malloc");
2250 
2251 	while (idx < len && src[idx]) {
2252 		const char c = src[idx];
2253 
2254 		if (c == '\t') {
2255 			size_t nb = TABSIZE - sz % TABSIZE;
2256 			char *p;
2257 
2258 			p = realloc(dst, n + nb);
2259 			if (p == NULL) {
2260 				free(dst);
2261 				return got_error_from_errno("realloc");
2262 
2263 			}
2264 			dst = p;
2265 			n += nb;
2266 			memset(dst + sz, ' ', nb);
2267 			sz += nb;
2268 		} else
2269 			dst[sz++] = src[idx];
2270 		++idx;
2271 	}
2272 
2273 	dst[sz] = '\0';
2274 	*ptr = dst;
2275 	return NULL;
2276 }
2277 
2278 /*
2279  * Advance at most n columns from wline starting at offset off.
2280  * Return the index to the first character after the span operation.
2281  * Return the combined column width of all spanned wide characters in
2282  * *rcol.
2283  */
2284 static int
2285 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2286 {
2287 	int width, i, cols = 0;
2288 
2289 	if (n == 0) {
2290 		*rcol = cols;
2291 		return off;
2292 	}
2293 
2294 	for (i = off; wline[i] != L'\0'; ++i) {
2295 		if (wline[i] == L'\t')
2296 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2297 		else
2298 			width = wcwidth(wline[i]);
2299 
2300 		if (width == -1) {
2301 			width = 1;
2302 			wline[i] = L'.';
2303 		}
2304 
2305 		if (cols + width > n)
2306 			break;
2307 		cols += width;
2308 	}
2309 
2310 	*rcol = cols;
2311 	return i;
2312 }
2313 
2314 /*
2315  * Format a line for display, ensuring that it won't overflow a width limit.
2316  * With scrolling, the width returned refers to the scrolled version of the
2317  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2318  */
2319 static const struct got_error *
2320 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2321     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2322 {
2323 	const struct got_error *err = NULL;
2324 	int cols;
2325 	wchar_t *wline = NULL;
2326 	char *exstr = NULL;
2327 	size_t wlen;
2328 	int i, scrollx;
2329 
2330 	*wlinep = NULL;
2331 	*widthp = 0;
2332 
2333 	if (expand) {
2334 		err = expand_tab(&exstr, line);
2335 		if (err)
2336 			return err;
2337 	}
2338 
2339 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2340 	free(exstr);
2341 	if (err)
2342 		return err;
2343 
2344 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2345 		wline[wlen - 1] = L'\0';
2346 		wlen--;
2347 	}
2348 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2349 		wline[wlen - 1] = L'\0';
2350 		wlen--;
2351 	}
2352 
2353 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2354 
2355 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2356 	wline[i] = L'\0';
2357 
2358 	if (widthp)
2359 		*widthp = cols;
2360 	if (scrollxp)
2361 		*scrollxp = scrollx;
2362 	if (err)
2363 		free(wline);
2364 	else
2365 		*wlinep = wline;
2366 	return err;
2367 }
2368 
2369 static const struct got_error*
2370 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2371     struct got_object_id *id, struct got_repository *repo)
2372 {
2373 	static const struct got_error *err = NULL;
2374 	struct got_reflist_entry *re;
2375 	char *s;
2376 	const char *name;
2377 
2378 	*refs_str = NULL;
2379 
2380 	if (refs == NULL)
2381 		return NULL;
2382 
2383 	TAILQ_FOREACH(re, refs, entry) {
2384 		struct got_tag_object *tag = NULL;
2385 		struct got_object_id *ref_id;
2386 		int cmp;
2387 
2388 		name = got_ref_get_name(re->ref);
2389 		if (strcmp(name, GOT_REF_HEAD) == 0)
2390 			continue;
2391 		if (strncmp(name, "refs/", 5) == 0)
2392 			name += 5;
2393 		if (strncmp(name, "got/", 4) == 0)
2394 			continue;
2395 		if (strncmp(name, "heads/", 6) == 0)
2396 			name += 6;
2397 		if (strncmp(name, "remotes/", 8) == 0) {
2398 			name += 8;
2399 			s = strstr(name, "/" GOT_REF_HEAD);
2400 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2401 				continue;
2402 		}
2403 		err = got_ref_resolve(&ref_id, repo, re->ref);
2404 		if (err)
2405 			break;
2406 		if (strncmp(name, "tags/", 5) == 0) {
2407 			err = got_object_open_as_tag(&tag, repo, ref_id);
2408 			if (err) {
2409 				if (err->code != GOT_ERR_OBJ_TYPE) {
2410 					free(ref_id);
2411 					break;
2412 				}
2413 				/* Ref points at something other than a tag. */
2414 				err = NULL;
2415 				tag = NULL;
2416 			}
2417 		}
2418 		cmp = got_object_id_cmp(tag ?
2419 		    got_object_tag_get_object_id(tag) : ref_id, id);
2420 		free(ref_id);
2421 		if (tag)
2422 			got_object_tag_close(tag);
2423 		if (cmp != 0)
2424 			continue;
2425 		s = *refs_str;
2426 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2427 		    s ? ", " : "", name) == -1) {
2428 			err = got_error_from_errno("asprintf");
2429 			free(s);
2430 			*refs_str = NULL;
2431 			break;
2432 		}
2433 		free(s);
2434 	}
2435 
2436 	return err;
2437 }
2438 
2439 static const struct got_error *
2440 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2441     int col_tab_align)
2442 {
2443 	char *smallerthan;
2444 
2445 	smallerthan = strchr(author, '<');
2446 	if (smallerthan && smallerthan[1] != '\0')
2447 		author = smallerthan + 1;
2448 	author[strcspn(author, "@>")] = '\0';
2449 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2450 	    col_tab_align, 0);
2451 }
2452 
2453 static const struct got_error *
2454 draw_commit_marker(struct tog_view *view, char c)
2455 {
2456 	struct tog_color *tc;
2457 
2458 	if (view->type != TOG_VIEW_LOG)
2459 		return got_error_msg(GOT_ERR_NOT_IMPL, "view not supported");
2460 
2461 	tc = get_color(&view->state.log.colors, TOG_COLOR_COMMIT);
2462 	if (tc != NULL)
2463 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2464 	if (waddch(view->window, c) == ERR)
2465 		return got_error_msg(GOT_ERR_IO, "waddch");
2466 	if (tc != NULL)
2467 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2468 
2469 	return NULL;
2470 }
2471 
2472 static const struct got_error *
2473 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2474     const size_t date_display_cols, int author_display_cols)
2475 {
2476 	struct tog_log_view_state *s = &view->state.log;
2477 	const struct got_error *err = NULL;
2478 	struct got_commit_object *commit = entry->commit;
2479 	struct got_object_id *id = entry->id;
2480 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2481 	char *refs_str = NULL;
2482 	char *logmsg0 = NULL, *logmsg = NULL;
2483 	char *author = NULL;
2484 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2485 	int author_width, refstr_width, logmsg_width;
2486 	char *newline, *line = NULL;
2487 	int col, limit, scrollx, logmsg_x;
2488 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2489 	struct tm tm;
2490 	time_t committer_time;
2491 	struct tog_color *tc;
2492 	struct got_reflist_head *refs;
2493 
2494 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2495 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2496 		tog_base_commit.idx = entry->idx;
2497 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2498 		int rc;
2499 
2500 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2501 		if (rc)
2502 			return got_error_set_errno(rc, "pthread_cond_wait");
2503 	}
2504 
2505 	committer_time = got_object_commit_get_committer_time(commit);
2506 	if (gmtime_r(&committer_time, &tm) == NULL)
2507 		return got_error_from_errno("gmtime_r");
2508 	if (strftime(datebuf, sizeof(datebuf), "%F ", &tm) == 0)
2509 		return got_error(GOT_ERR_NO_SPACE);
2510 
2511 	if (avail <= date_display_cols)
2512 		limit = MIN(sizeof(datebuf) - 1, avail);
2513 	else
2514 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2515 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2516 	if (tc)
2517 		wattr_on(view->window,
2518 		    COLOR_PAIR(tc->colorpair), NULL);
2519 	waddnstr(view->window, datebuf, limit);
2520 	if (tc)
2521 		wattr_off(view->window,
2522 		    COLOR_PAIR(tc->colorpair), NULL);
2523 	col = limit;
2524 	if (col > avail)
2525 		goto done;
2526 
2527 	if (avail >= 120) {
2528 		char *id_str;
2529 		err = got_object_id_str(&id_str, id);
2530 		if (err)
2531 			goto done;
2532 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2533 		if (tc)
2534 			wattr_on(view->window,
2535 			    COLOR_PAIR(tc->colorpair), NULL);
2536 		wprintw(view->window, "%.8s ", id_str);
2537 		if (tc)
2538 			wattr_off(view->window,
2539 			    COLOR_PAIR(tc->colorpair), NULL);
2540 		free(id_str);
2541 		col += 9;
2542 		if (col > avail)
2543 			goto done;
2544 	}
2545 
2546 	if (s->use_committer)
2547 		author = strdup(got_object_commit_get_committer(commit));
2548 	else
2549 		author = strdup(got_object_commit_get_author(commit));
2550 	if (author == NULL) {
2551 		err = got_error_from_errno("strdup");
2552 		goto done;
2553 	}
2554 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2555 	if (err)
2556 		goto done;
2557 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2558 	if (tc)
2559 		wattr_on(view->window,
2560 		    COLOR_PAIR(tc->colorpair), NULL);
2561 	waddwstr(view->window, wauthor);
2562 	col += author_width;
2563 	while (col < avail && author_width < author_display_cols + 2) {
2564 		if (s->marked_entry == entry && author_width == marker_column) {
2565 			err = draw_commit_marker(view, '>');
2566 			if (err != NULL)
2567 				goto done;
2568 		} else if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN
2569 		    && author_width == marker_column &&
2570 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2571 			err = draw_commit_marker(view, tog_base_commit.marker);
2572 			if (err != NULL)
2573 				goto done;
2574 		} else
2575 			waddch(view->window, ' ');
2576 		col++;
2577 		author_width++;
2578 	}
2579 	if (tc)
2580 		wattr_off(view->window,
2581 		    COLOR_PAIR(tc->colorpair), NULL);
2582 	if (col > avail)
2583 		goto done;
2584 
2585 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2586 	if (err)
2587 		goto done;
2588 	logmsg = logmsg0;
2589 	while (*logmsg == '\n')
2590 		logmsg++;
2591 	newline = strchr(logmsg, '\n');
2592 	if (newline)
2593 		*newline = '\0';
2594 
2595 	limit = avail - col;
2596 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2597 		limit--;	/* for the border */
2598 
2599 	/* Prepend reference labels to log message if possible .*/
2600 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2601 	err = build_refs_str(&refs_str, refs, id, s->repo);
2602 	if (err)
2603 		goto done;
2604 	if (refs_str) {
2605 		char *rs;
2606 
2607 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2608 			err = got_error_from_errno("asprintf");
2609 			goto done;
2610 		}
2611 		err = format_line(&wrefstr, &refstr_width,
2612 		    &scrollx, rs, view->x, limit, col, 1);
2613 		free(rs);
2614 		if (err)
2615 			goto done;
2616 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2617 		if (tc)
2618 			wattr_on(view->window,
2619 			    COLOR_PAIR(tc->colorpair), NULL);
2620 		waddwstr(view->window, &wrefstr[scrollx]);
2621 		if (tc)
2622 			wattr_off(view->window,
2623 			    COLOR_PAIR(tc->colorpair), NULL);
2624 		col += MAX(refstr_width, 0);
2625 		if (col > avail)
2626 			goto done;
2627 
2628 		if (col < avail) {
2629 			waddch(view->window, ' ');
2630 			col++;
2631 		}
2632 
2633 		if (refstr_width > 0)
2634 			logmsg_x = 0;
2635 		else {
2636 			int unscrolled_refstr_width;
2637 			size_t len = wcslen(wrefstr);
2638 
2639 			/*
2640 			 * No need to check for -1 return value here since
2641 			 * unprintables have been replaced by span_wline().
2642 			 */
2643 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2644 			unscrolled_refstr_width += 1; /* trailing space */
2645 			logmsg_x = view->x - unscrolled_refstr_width;
2646 		}
2647 
2648 		limit = avail - col;
2649 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2650 			limit--;	/* for the border */
2651 	} else
2652 		logmsg_x = view->x;
2653 
2654 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2655 	    limit, col, 1);
2656 	if (err)
2657 		goto done;
2658 	waddwstr(view->window, &wlogmsg[scrollx]);
2659 	col += MAX(logmsg_width, 0);
2660 	while (col < avail) {
2661 		waddch(view->window, ' ');
2662 		col++;
2663 	}
2664 done:
2665 	free(logmsg0);
2666 	free(wlogmsg);
2667 	free(wrefstr);
2668 	free(refs_str);
2669 	free(author);
2670 	free(wauthor);
2671 	free(line);
2672 	return err;
2673 }
2674 
2675 static struct commit_queue_entry *
2676 alloc_commit_queue_entry(struct got_commit_object *commit,
2677     struct got_object_id *id)
2678 {
2679 	struct commit_queue_entry *entry;
2680 	struct got_object_id *dup;
2681 
2682 	entry = calloc(1, sizeof(*entry));
2683 	if (entry == NULL)
2684 		return NULL;
2685 
2686 	dup = got_object_id_dup(id);
2687 	if (dup == NULL) {
2688 		free(entry);
2689 		return NULL;
2690 	}
2691 
2692 	entry->id = dup;
2693 	entry->commit = commit;
2694 	return entry;
2695 }
2696 
2697 static void
2698 pop_commit(struct commit_queue *commits)
2699 {
2700 	struct commit_queue_entry *entry;
2701 
2702 	entry = TAILQ_FIRST(&commits->head);
2703 	TAILQ_REMOVE(&commits->head, entry, entry);
2704 	got_object_commit_close(entry->commit);
2705 	commits->ncommits--;
2706 	free(entry->id);
2707 	free(entry);
2708 }
2709 
2710 static void
2711 free_commits(struct commit_queue *commits)
2712 {
2713 	while (!TAILQ_EMPTY(&commits->head))
2714 		pop_commit(commits);
2715 }
2716 
2717 static const struct got_error *
2718 match_commit(int *have_match, struct got_object_id *id,
2719     struct got_commit_object *commit, regex_t *regex)
2720 {
2721 	const struct got_error *err = NULL;
2722 	regmatch_t regmatch;
2723 	char *id_str = NULL, *logmsg = NULL;
2724 
2725 	*have_match = 0;
2726 
2727 	err = got_object_id_str(&id_str, id);
2728 	if (err)
2729 		return err;
2730 
2731 	err = got_object_commit_get_logmsg(&logmsg, commit);
2732 	if (err)
2733 		goto done;
2734 
2735 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2736 	    &regmatch, 0) == 0 ||
2737 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2738 	    &regmatch, 0) == 0 ||
2739 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2740 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2741 		*have_match = 1;
2742 done:
2743 	free(id_str);
2744 	free(logmsg);
2745 	return err;
2746 }
2747 
2748 static const struct got_error *
2749 queue_commits(struct tog_log_thread_args *a)
2750 {
2751 	const struct got_error *err = NULL;
2752 
2753 	/*
2754 	 * We keep all commits open throughout the lifetime of the log
2755 	 * view in order to avoid having to re-fetch commits from disk
2756 	 * while updating the display.
2757 	 */
2758 	do {
2759 		struct got_object_id id;
2760 		struct got_commit_object *commit;
2761 		struct commit_queue_entry *entry;
2762 		int limit_match = 0;
2763 		int errcode;
2764 
2765 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2766 		    NULL, NULL);
2767 		if (err)
2768 			break;
2769 
2770 		err = got_object_open_as_commit(&commit, a->repo, &id);
2771 		if (err)
2772 			break;
2773 		entry = alloc_commit_queue_entry(commit, &id);
2774 		if (entry == NULL) {
2775 			err = got_error_from_errno("alloc_commit_queue_entry");
2776 			break;
2777 		}
2778 
2779 		errcode = pthread_mutex_lock(&tog_mutex);
2780 		if (errcode) {
2781 			err = got_error_set_errno(errcode,
2782 			    "pthread_mutex_lock");
2783 			break;
2784 		}
2785 
2786 		entry->idx = a->real_commits->ncommits;
2787 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2788 		a->real_commits->ncommits++;
2789 
2790 		if (*a->limiting) {
2791 			err = match_commit(&limit_match, &id, commit,
2792 			    a->limit_regex);
2793 			if (err)
2794 				break;
2795 
2796 			if (limit_match) {
2797 				struct commit_queue_entry *matched;
2798 
2799 				matched = alloc_commit_queue_entry(
2800 				    entry->commit, entry->id);
2801 				if (matched == NULL) {
2802 					err = got_error_from_errno(
2803 					    "alloc_commit_queue_entry");
2804 					break;
2805 				}
2806 				matched->commit = entry->commit;
2807 				got_object_commit_retain(entry->commit);
2808 
2809 				matched->idx = a->limit_commits->ncommits;
2810 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2811 				    matched, entry);
2812 				a->limit_commits->ncommits++;
2813 			}
2814 
2815 			/*
2816 			 * This is how we signal log_thread() that we
2817 			 * have found a match, and that it should be
2818 			 * counted as a new entry for the view.
2819 			 */
2820 			a->limit_match = limit_match;
2821 		}
2822 
2823 		if (*a->searching == TOG_SEARCH_FORWARD &&
2824 		    !*a->search_next_done) {
2825 			int have_match;
2826 			err = match_commit(&have_match, &id, commit, a->regex);
2827 			if (err)
2828 				break;
2829 
2830 			if (*a->limiting) {
2831 				if (limit_match && have_match)
2832 					*a->search_next_done =
2833 					    TOG_SEARCH_HAVE_MORE;
2834 			} else if (have_match)
2835 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2836 		}
2837 
2838 		errcode = pthread_mutex_unlock(&tog_mutex);
2839 		if (errcode && err == NULL)
2840 			err = got_error_set_errno(errcode,
2841 			    "pthread_mutex_unlock");
2842 		if (err)
2843 			break;
2844 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2845 
2846 	return err;
2847 }
2848 
2849 static void
2850 select_commit(struct tog_log_view_state *s)
2851 {
2852 	struct commit_queue_entry *entry;
2853 	int ncommits = 0;
2854 
2855 	entry = s->first_displayed_entry;
2856 	while (entry) {
2857 		if (ncommits == s->selected) {
2858 			s->selected_entry = entry;
2859 			break;
2860 		}
2861 		entry = TAILQ_NEXT(entry, entry);
2862 		ncommits++;
2863 	}
2864 }
2865 
2866 static const struct got_error *
2867 draw_commits(struct tog_view *view)
2868 {
2869 	const struct got_error *err = NULL;
2870 	struct tog_log_view_state *s = &view->state.log;
2871 	struct commit_queue_entry *entry = s->selected_entry;
2872 	int limit = view->nlines;
2873 	int width;
2874 	int ncommits, author_cols = 4, refstr_cols;
2875 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2876 	char *refs_str = NULL;
2877 	wchar_t *wline;
2878 	struct tog_color *tc;
2879 	static const size_t date_display_cols = 12;
2880 	struct got_reflist_head *refs;
2881 
2882 	if (view_is_hsplit_top(view))
2883 		--limit;  /* account for border */
2884 
2885 	if (s->selected_entry &&
2886 	    !(view->searching && view->search_next_done == 0)) {
2887 		err = got_object_id_str(&id_str, s->selected_entry->id);
2888 		if (err)
2889 			return err;
2890 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2891 		    s->selected_entry->id);
2892 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2893 		    s->repo);
2894 		if (err)
2895 			goto done;
2896 	}
2897 
2898 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2899 		halfdelay(10); /* disable fast refresh */
2900 
2901 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2902 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2903 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2904 		    (view->searching && !view->search_next_done) ?
2905 		    "searching..." : "loading...") == -1) {
2906 			err = got_error_from_errno("asprintf");
2907 			goto done;
2908 		}
2909 	} else {
2910 		const char *search_str = NULL;
2911 		const char *limit_str = NULL;
2912 
2913 		if (view->searching) {
2914 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2915 				search_str = "no more matches";
2916 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2917 				search_str = "no matches found";
2918 			else if (!view->search_next_done)
2919 				search_str = "searching...";
2920 		}
2921 
2922 		if (s->limit_view && s->commits->ncommits == 0)
2923 			limit_str = "no matches found";
2924 
2925 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2926 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2927 		    search_str ? search_str : (refs_str ? refs_str : ""),
2928 		    limit_str ? limit_str : "") == -1) {
2929 			err = got_error_from_errno("asprintf");
2930 			goto done;
2931 		}
2932 	}
2933 
2934 	free(refs_str);
2935 	refs_str = NULL;
2936 
2937 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2938 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2939 		    "........................................",
2940 		    s->in_repo_path, ncommits_str) == -1) {
2941 			err = got_error_from_errno("asprintf");
2942 			header = NULL;
2943 			goto done;
2944 		}
2945 	} else if (asprintf(&header, "commit %s%s",
2946 	    id_str ? id_str : "........................................",
2947 	    ncommits_str) == -1) {
2948 		err = got_error_from_errno("asprintf");
2949 		header = NULL;
2950 		goto done;
2951 	}
2952 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2953 	if (err)
2954 		goto done;
2955 
2956 	werase(view->window);
2957 
2958 	if (view_needs_focus_indication(view))
2959 		wstandout(view->window);
2960 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2961 	if (tc)
2962 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2963 	waddwstr(view->window, wline);
2964 	while (width < view->ncols) {
2965 		waddch(view->window, ' ');
2966 		width++;
2967 	}
2968 	if (tc)
2969 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2970 	if (view_needs_focus_indication(view))
2971 		wstandend(view->window);
2972 	free(wline);
2973 	if (limit <= 1)
2974 		goto done;
2975 
2976 	/* Grow author column size if necessary, and set view->maxx. */
2977 	entry = s->first_displayed_entry;
2978 	ncommits = 0;
2979 	view->maxx = 0;
2980 	while (entry) {
2981 		struct got_commit_object *c = entry->commit;
2982 		char *author, *eol, *msg, *msg0;
2983 		wchar_t *wauthor, *wmsg;
2984 		int width;
2985 		if (ncommits >= limit - 1)
2986 			break;
2987 		if (s->use_committer)
2988 			author = strdup(got_object_commit_get_committer(c));
2989 		else
2990 			author = strdup(got_object_commit_get_author(c));
2991 		if (author == NULL) {
2992 			err = got_error_from_errno("strdup");
2993 			goto done;
2994 		}
2995 		err = format_author(&wauthor, &width, author, COLS,
2996 		    date_display_cols);
2997 		if (author_cols < width)
2998 			author_cols = width;
2999 		free(wauthor);
3000 		free(author);
3001 		if (err)
3002 			goto done;
3003 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
3004 		    entry->id);
3005 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
3006 		if (err)
3007 			goto done;
3008 		if (refs_str) {
3009 			wchar_t *ws;
3010 			err = format_line(&ws, &width, NULL, refs_str,
3011 			    0, INT_MAX, date_display_cols + author_cols, 0);
3012 			free(ws);
3013 			free(refs_str);
3014 			refs_str = NULL;
3015 			if (err)
3016 				goto done;
3017 			refstr_cols = width + 3; /* account for [ ] + space */
3018 		} else
3019 			refstr_cols = 0;
3020 		err = got_object_commit_get_logmsg(&msg0, c);
3021 		if (err)
3022 			goto done;
3023 		msg = msg0;
3024 		while (*msg == '\n')
3025 			++msg;
3026 		if ((eol = strchr(msg, '\n')))
3027 			*eol = '\0';
3028 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
3029 		    date_display_cols + author_cols + refstr_cols, 0);
3030 		if (err)
3031 			goto done;
3032 		view->maxx = MAX(view->maxx, width + refstr_cols);
3033 		free(msg0);
3034 		free(wmsg);
3035 		ncommits++;
3036 		entry = TAILQ_NEXT(entry, entry);
3037 	}
3038 
3039 	entry = s->first_displayed_entry;
3040 	s->last_displayed_entry = s->first_displayed_entry;
3041 	ncommits = 0;
3042 	while (entry) {
3043 		if (ncommits >= limit - 1)
3044 			break;
3045 		if (ncommits == s->selected)
3046 			wstandout(view->window);
3047 		err = draw_commit(view, entry, date_display_cols, author_cols);
3048 		if (ncommits == s->selected)
3049 			wstandend(view->window);
3050 		if (err)
3051 			goto done;
3052 		ncommits++;
3053 		s->last_displayed_entry = entry;
3054 		entry = TAILQ_NEXT(entry, entry);
3055 	}
3056 
3057 	view_border(view);
3058 done:
3059 	free(id_str);
3060 	free(refs_str);
3061 	free(ncommits_str);
3062 	free(header);
3063 	return err;
3064 }
3065 
3066 static void
3067 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3068 {
3069 	struct commit_queue_entry *entry;
3070 	int nscrolled = 0;
3071 
3072 	entry = TAILQ_FIRST(&s->commits->head);
3073 	if (s->first_displayed_entry == entry)
3074 		return;
3075 
3076 	entry = s->first_displayed_entry;
3077 	while (entry && nscrolled < maxscroll) {
3078 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3079 		if (entry) {
3080 			s->first_displayed_entry = entry;
3081 			nscrolled++;
3082 		}
3083 	}
3084 }
3085 
3086 static const struct got_error *
3087 trigger_log_thread(struct tog_view *view, int wait)
3088 {
3089 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3090 	int errcode;
3091 
3092 	if (!using_mock_io)
3093 		halfdelay(1); /* fast refresh while loading commits */
3094 
3095 	while (!ta->log_complete && !tog_thread_error &&
3096 	    (ta->commits_needed > 0 || ta->load_all)) {
3097 		/* Wake the log thread. */
3098 		errcode = pthread_cond_signal(&ta->need_commits);
3099 		if (errcode)
3100 			return got_error_set_errno(errcode,
3101 			    "pthread_cond_signal");
3102 
3103 		/*
3104 		 * The mutex will be released while the view loop waits
3105 		 * in wgetch(), at which time the log thread will run.
3106 		 */
3107 		if (!wait)
3108 			break;
3109 
3110 		/* Display progress update in log view. */
3111 		show_log_view(view);
3112 		update_panels();
3113 		doupdate();
3114 
3115 		/* Wait right here while next commit is being loaded. */
3116 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3117 		if (errcode)
3118 			return got_error_set_errno(errcode,
3119 			    "pthread_cond_wait");
3120 
3121 		/* Display progress update in log view. */
3122 		show_log_view(view);
3123 		update_panels();
3124 		doupdate();
3125 	}
3126 
3127 	return NULL;
3128 }
3129 
3130 static const struct got_error *
3131 request_log_commits(struct tog_view *view)
3132 {
3133 	struct tog_log_view_state	*state = &view->state.log;
3134 	const struct got_error		*err = NULL;
3135 
3136 	if (state->thread_args.log_complete)
3137 		return NULL;
3138 
3139 	state->thread_args.commits_needed += view->nscrolled;
3140 	err = trigger_log_thread(view, 1);
3141 	view->nscrolled = 0;
3142 
3143 	return err;
3144 }
3145 
3146 static const struct got_error *
3147 log_scroll_down(struct tog_view *view, int maxscroll)
3148 {
3149 	struct tog_log_view_state *s = &view->state.log;
3150 	const struct got_error *err = NULL;
3151 	struct commit_queue_entry *pentry;
3152 	int nscrolled = 0, ncommits_needed;
3153 
3154 	if (s->last_displayed_entry == NULL)
3155 		return NULL;
3156 
3157 	ncommits_needed = s->last_displayed_entry->idx + 2 + maxscroll;
3158 	if (s->commits->ncommits < ncommits_needed &&
3159 	    !s->thread_args.log_complete) {
3160 		/*
3161 		 * Ask the log thread for required amount of commits.
3162 		 */
3163 		s->thread_args.commits_needed +=
3164 		    ncommits_needed - s->commits->ncommits;
3165 		err = trigger_log_thread(view, 1);
3166 		if (err)
3167 			return err;
3168 	}
3169 
3170 	do {
3171 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3172 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3173 			break;
3174 
3175 		s->last_displayed_entry = pentry ?
3176 		    pentry : s->last_displayed_entry;
3177 
3178 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3179 		if (pentry == NULL)
3180 			break;
3181 		s->first_displayed_entry = pentry;
3182 	} while (++nscrolled < maxscroll);
3183 
3184 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3185 		view->nscrolled += nscrolled;
3186 	else
3187 		view->nscrolled = 0;
3188 
3189 	return err;
3190 }
3191 
3192 static const struct got_error *
3193 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3194     struct got_commit_object *commit, struct got_object_id *commit_id,
3195     struct tog_view *log_view, struct got_repository *repo)
3196 {
3197 	const struct got_error *err;
3198 	struct got_object_qid *p;
3199 	struct got_object_id *parent_id;
3200 	struct tog_view *diff_view;
3201 	struct tog_log_view_state *ls = NULL;
3202 
3203 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3204 	if (diff_view == NULL)
3205 		return got_error_from_errno("view_open");
3206 
3207 	if (log_view != NULL)
3208 		ls = &log_view->state.log;
3209 
3210 	if (ls != NULL && ls->marked_entry != NULL &&
3211 	    ls->marked_entry != ls->selected_entry)
3212 		parent_id = ls->marked_entry->id;
3213 	else if ((p = STAILQ_FIRST(got_object_commit_get_parent_ids(commit))))
3214 		parent_id = &p->id;
3215 	else
3216 		parent_id = NULL;
3217 
3218 	err = open_diff_view(diff_view, parent_id, commit_id,
3219 	    NULL, NULL, 3, 0, 0, log_view, repo);
3220 	if (err == NULL)
3221 		*new_view = diff_view;
3222 	return err;
3223 }
3224 
3225 static const struct got_error *
3226 tree_view_visit_subtree(struct tog_tree_view_state *s,
3227     struct got_tree_object *subtree)
3228 {
3229 	struct tog_parent_tree *parent;
3230 
3231 	parent = calloc(1, sizeof(*parent));
3232 	if (parent == NULL)
3233 		return got_error_from_errno("calloc");
3234 
3235 	parent->tree = s->tree;
3236 	parent->first_displayed_entry = s->first_displayed_entry;
3237 	parent->selected_entry = s->selected_entry;
3238 	parent->selected = s->selected;
3239 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3240 	s->tree = subtree;
3241 	s->selected = 0;
3242 	s->first_displayed_entry = NULL;
3243 	return NULL;
3244 }
3245 
3246 static const struct got_error *
3247 tree_view_walk_path(struct tog_tree_view_state *s,
3248     struct got_commit_object *commit, const char *path)
3249 {
3250 	const struct got_error *err = NULL;
3251 	struct got_tree_object *tree = NULL;
3252 	const char *p;
3253 	char *slash, *subpath = NULL;
3254 
3255 	/* Walk the path and open corresponding tree objects. */
3256 	p = path;
3257 	while (*p) {
3258 		struct got_tree_entry *te;
3259 		struct got_object_id *tree_id;
3260 		char *te_name;
3261 
3262 		while (p[0] == '/')
3263 			p++;
3264 
3265 		/* Ensure the correct subtree entry is selected. */
3266 		slash = strchr(p, '/');
3267 		if (slash == NULL)
3268 			te_name = strdup(p);
3269 		else
3270 			te_name = strndup(p, slash - p);
3271 		if (te_name == NULL) {
3272 			err = got_error_from_errno("strndup");
3273 			break;
3274 		}
3275 		te = got_object_tree_find_entry(s->tree, te_name);
3276 		if (te == NULL) {
3277 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3278 			free(te_name);
3279 			break;
3280 		}
3281 		free(te_name);
3282 		s->first_displayed_entry = s->selected_entry = te;
3283 
3284 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3285 			break; /* jump to this file's entry */
3286 
3287 		slash = strchr(p, '/');
3288 		if (slash)
3289 			subpath = strndup(path, slash - path);
3290 		else
3291 			subpath = strdup(path);
3292 		if (subpath == NULL) {
3293 			err = got_error_from_errno("strdup");
3294 			break;
3295 		}
3296 
3297 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3298 		    subpath);
3299 		if (err)
3300 			break;
3301 
3302 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3303 		free(tree_id);
3304 		if (err)
3305 			break;
3306 
3307 		err = tree_view_visit_subtree(s, tree);
3308 		if (err) {
3309 			got_object_tree_close(tree);
3310 			break;
3311 		}
3312 		if (slash == NULL)
3313 			break;
3314 		free(subpath);
3315 		subpath = NULL;
3316 		p = slash;
3317 	}
3318 
3319 	free(subpath);
3320 	return err;
3321 }
3322 
3323 static const struct got_error *
3324 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3325     struct commit_queue_entry *entry, const char *path,
3326     const char *head_ref_name, struct got_repository *repo)
3327 {
3328 	const struct got_error *err = NULL;
3329 	struct tog_tree_view_state *s;
3330 	struct tog_view *tree_view;
3331 
3332 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3333 	if (tree_view == NULL)
3334 		return got_error_from_errno("view_open");
3335 
3336 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3337 	if (err)
3338 		return err;
3339 	s = &tree_view->state.tree;
3340 
3341 	*new_view = tree_view;
3342 
3343 	if (got_path_is_root_dir(path))
3344 		return NULL;
3345 
3346 	return tree_view_walk_path(s, entry->commit, path);
3347 }
3348 
3349 static const struct got_error *
3350 block_signals_used_by_main_thread(void)
3351 {
3352 	sigset_t sigset;
3353 	int errcode;
3354 
3355 	if (sigemptyset(&sigset) == -1)
3356 		return got_error_from_errno("sigemptyset");
3357 
3358 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3359 	if (sigaddset(&sigset, SIGWINCH) == -1)
3360 		return got_error_from_errno("sigaddset");
3361 	if (sigaddset(&sigset, SIGCONT) == -1)
3362 		return got_error_from_errno("sigaddset");
3363 	if (sigaddset(&sigset, SIGINT) == -1)
3364 		return got_error_from_errno("sigaddset");
3365 	if (sigaddset(&sigset, SIGTERM) == -1)
3366 		return got_error_from_errno("sigaddset");
3367 
3368 	/* ncurses handles SIGTSTP */
3369 	if (sigaddset(&sigset, SIGTSTP) == -1)
3370 		return got_error_from_errno("sigaddset");
3371 
3372 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3373 	if (errcode)
3374 		return got_error_set_errno(errcode, "pthread_sigmask");
3375 
3376 	return NULL;
3377 }
3378 
3379 static void *
3380 log_thread(void *arg)
3381 {
3382 	const struct got_error *err = NULL;
3383 	int errcode = 0;
3384 	struct tog_log_thread_args *a = arg;
3385 	int done = 0;
3386 
3387 	/*
3388 	 * Sync startup with main thread such that we begin our
3389 	 * work once view_input() has released the mutex.
3390 	 */
3391 	errcode = pthread_mutex_lock(&tog_mutex);
3392 	if (errcode) {
3393 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3394 		return (void *)err;
3395 	}
3396 
3397 	err = block_signals_used_by_main_thread();
3398 	if (err) {
3399 		pthread_mutex_unlock(&tog_mutex);
3400 		goto done;
3401 	}
3402 
3403 	while (!done && !err && !tog_fatal_signal_received()) {
3404 		errcode = pthread_mutex_unlock(&tog_mutex);
3405 		if (errcode) {
3406 			err = got_error_set_errno(errcode,
3407 			    "pthread_mutex_unlock");
3408 			goto done;
3409 		}
3410 		err = queue_commits(a);
3411 		if (err) {
3412 			if (err->code != GOT_ERR_ITER_COMPLETED)
3413 				goto done;
3414 			err = NULL;
3415 			done = 1;
3416 			a->commits_needed = 0;
3417 		} else if (a->commits_needed > 0 && !a->load_all) {
3418 			if (*a->limiting) {
3419 				if (a->limit_match)
3420 					a->commits_needed--;
3421 			} else
3422 				a->commits_needed--;
3423 		}
3424 
3425 		errcode = pthread_mutex_lock(&tog_mutex);
3426 		if (errcode) {
3427 			err = got_error_set_errno(errcode,
3428 			    "pthread_mutex_lock");
3429 			goto done;
3430 		} else if (*a->quit)
3431 			done = 1;
3432 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3433 			*a->first_displayed_entry =
3434 			    TAILQ_FIRST(&a->limit_commits->head);
3435 			*a->selected_entry = *a->first_displayed_entry;
3436 		} else if (*a->first_displayed_entry == NULL) {
3437 			*a->first_displayed_entry =
3438 			    TAILQ_FIRST(&a->real_commits->head);
3439 			*a->selected_entry = *a->first_displayed_entry;
3440 		}
3441 
3442 		errcode = pthread_cond_signal(&a->commit_loaded);
3443 		if (errcode) {
3444 			err = got_error_set_errno(errcode,
3445 			    "pthread_cond_signal");
3446 			pthread_mutex_unlock(&tog_mutex);
3447 			goto done;
3448 		}
3449 
3450 		if (a->commits_needed == 0 &&
3451 		    a->need_commit_marker && a->worktree) {
3452 			errcode = pthread_mutex_unlock(&tog_mutex);
3453 			if (errcode) {
3454 				err = got_error_set_errno(errcode,
3455 				    "pthread_mutex_unlock");
3456 				goto done;
3457 			}
3458 			err = got_worktree_get_state(&tog_base_commit.marker,
3459 			    a->repo, a->worktree, NULL, NULL);
3460 			if (err)
3461 				goto done;
3462 			errcode = pthread_mutex_lock(&tog_mutex);
3463 			if (errcode) {
3464 				err = got_error_set_errno(errcode,
3465 				    "pthread_mutex_lock");
3466 				goto done;
3467 			}
3468 			a->need_commit_marker = 0;
3469 			/*
3470 			 * The main thread did not close this
3471 			 * work tree yet. Close it now.
3472 			 */
3473 			got_worktree_close(a->worktree);
3474 			a->worktree = NULL;
3475 
3476 			if (*a->quit)
3477 				done = 1;
3478 		}
3479 
3480 		if (done)
3481 			a->commits_needed = 0;
3482 		else {
3483 			if (a->commits_needed == 0 && !a->load_all) {
3484 				if (tog_io.wait_for_ui) {
3485 					errcode = pthread_cond_signal(
3486 					    &a->log_loaded);
3487 					if (errcode && err == NULL)
3488 						err = got_error_set_errno(
3489 						    errcode,
3490 						    "pthread_cond_signal");
3491 				}
3492 
3493 				errcode = pthread_cond_wait(&a->need_commits,
3494 				    &tog_mutex);
3495 				if (errcode) {
3496 					err = got_error_set_errno(errcode,
3497 					    "pthread_cond_wait");
3498 					pthread_mutex_unlock(&tog_mutex);
3499 					goto done;
3500 				}
3501 				if (*a->quit)
3502 					done = 1;
3503 			}
3504 		}
3505 	}
3506 	a->log_complete = 1;
3507 	if (tog_io.wait_for_ui) {
3508 		errcode = pthread_cond_signal(&a->log_loaded);
3509 		if (errcode && err == NULL)
3510 			err = got_error_set_errno(errcode,
3511 			    "pthread_cond_signal");
3512 	}
3513 
3514 	errcode = pthread_mutex_unlock(&tog_mutex);
3515 	if (errcode)
3516 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3517 done:
3518 	if (err) {
3519 		tog_thread_error = 1;
3520 		pthread_cond_signal(&a->commit_loaded);
3521 		if (a->worktree) {
3522 			got_worktree_close(a->worktree);
3523 			a->worktree = NULL;
3524 		}
3525 	}
3526 	return (void *)err;
3527 }
3528 
3529 static const struct got_error *
3530 stop_log_thread(struct tog_log_view_state *s)
3531 {
3532 	const struct got_error *err = NULL, *thread_err = NULL;
3533 	int errcode;
3534 
3535 	if (s->thread) {
3536 		s->quit = 1;
3537 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3538 		if (errcode)
3539 			return got_error_set_errno(errcode,
3540 			    "pthread_cond_signal");
3541 		errcode = pthread_mutex_unlock(&tog_mutex);
3542 		if (errcode)
3543 			return got_error_set_errno(errcode,
3544 			    "pthread_mutex_unlock");
3545 		errcode = pthread_join(s->thread, (void **)&thread_err);
3546 		if (errcode)
3547 			return got_error_set_errno(errcode, "pthread_join");
3548 		errcode = pthread_mutex_lock(&tog_mutex);
3549 		if (errcode)
3550 			return got_error_set_errno(errcode,
3551 			    "pthread_mutex_lock");
3552 		s->thread = NULL;
3553 	}
3554 
3555 	if (s->thread_args.repo) {
3556 		err = got_repo_close(s->thread_args.repo);
3557 		s->thread_args.repo = NULL;
3558 	}
3559 
3560 	if (s->thread_args.pack_fds) {
3561 		const struct got_error *pack_err =
3562 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3563 		if (err == NULL)
3564 			err = pack_err;
3565 		s->thread_args.pack_fds = NULL;
3566 	}
3567 
3568 	if (s->thread_args.graph) {
3569 		got_commit_graph_close(s->thread_args.graph);
3570 		s->thread_args.graph = NULL;
3571 	}
3572 
3573 	return err ? err : thread_err;
3574 }
3575 
3576 static const struct got_error *
3577 close_log_view(struct tog_view *view)
3578 {
3579 	const struct got_error *err = NULL;
3580 	struct tog_log_view_state *s = &view->state.log;
3581 	int errcode;
3582 
3583 	log_mark_clear(s);
3584 
3585 	err = stop_log_thread(s);
3586 
3587 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3588 	if (errcode && err == NULL)
3589 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3590 
3591 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3592 	if (errcode && err == NULL)
3593 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3594 
3595 	free_commits(&s->limit_commits);
3596 	free_commits(&s->real_commits);
3597 	free_colors(&s->colors);
3598 	free(s->in_repo_path);
3599 	s->in_repo_path = NULL;
3600 	free(s->start_id);
3601 	s->start_id = NULL;
3602 	free(s->head_ref_name);
3603 	s->head_ref_name = NULL;
3604 	return err;
3605 }
3606 
3607 /*
3608  * We use two queues to implement the limit feature: first consists of
3609  * commits matching the current limit_regex; second is the real queue
3610  * of all known commits (real_commits). When the user starts limiting,
3611  * we swap queues such that all movement and displaying functionality
3612  * works with very slight change.
3613  */
3614 static const struct got_error *
3615 limit_log_view(struct tog_view *view)
3616 {
3617 	struct tog_log_view_state *s = &view->state.log;
3618 	struct commit_queue_entry *entry;
3619 	struct tog_view	*v = view;
3620 	const struct got_error *err = NULL;
3621 	char pattern[1024];
3622 	int ret;
3623 
3624 	if (view_is_hsplit_top(view))
3625 		v = view->child;
3626 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3627 		v = view->parent;
3628 
3629 	if (tog_io.input_str != NULL) {
3630 		if (strlcpy(pattern, tog_io.input_str, sizeof(pattern)) >=
3631 		    sizeof(pattern))
3632 			return got_error(GOT_ERR_NO_SPACE);
3633 	} else {
3634 		wmove(v->window, v->nlines - 1, 0);
3635 		wclrtoeol(v->window);
3636 		mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3637 		nodelay(v->window, FALSE);
3638 		nocbreak();
3639 		echo();
3640 		ret = wgetnstr(v->window, pattern, sizeof(pattern));
3641 		cbreak();
3642 		noecho();
3643 		nodelay(v->window, TRUE);
3644 		if (ret == ERR)
3645 			return NULL;
3646 	}
3647 
3648 	if (*pattern == '\0') {
3649 		/*
3650 		 * Safety measure for the situation where the user
3651 		 * resets limit without previously limiting anything.
3652 		 */
3653 		if (!s->limit_view)
3654 			return NULL;
3655 
3656 		/*
3657 		 * User could have pressed Ctrl+L, which refreshed the
3658 		 * commit queues, it means we can't save previously
3659 		 * (before limit took place) displayed entries,
3660 		 * because they would point to already free'ed memory,
3661 		 * so we are forced to always select first entry of
3662 		 * the queue.
3663 		 */
3664 		s->commits = &s->real_commits;
3665 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3666 		s->selected_entry = s->first_displayed_entry;
3667 		s->selected = 0;
3668 		s->limit_view = 0;
3669 
3670 		return NULL;
3671 	}
3672 
3673 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3674 		return NULL;
3675 
3676 	s->limit_view = 1;
3677 
3678 	/* Clear the screen while loading limit view */
3679 	s->first_displayed_entry = NULL;
3680 	s->last_displayed_entry = NULL;
3681 	s->selected_entry = NULL;
3682 	s->commits = &s->limit_commits;
3683 
3684 	/* Prepare limit queue for new search */
3685 	free_commits(&s->limit_commits);
3686 	s->limit_commits.ncommits = 0;
3687 
3688 	/* First process commits, which are in queue already */
3689 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3690 		int have_match = 0;
3691 
3692 		err = match_commit(&have_match, entry->id,
3693 		    entry->commit, &s->limit_regex);
3694 		if (err)
3695 			return err;
3696 
3697 		if (have_match) {
3698 			struct commit_queue_entry *matched;
3699 
3700 			matched = alloc_commit_queue_entry(entry->commit,
3701 			    entry->id);
3702 			if (matched == NULL) {
3703 				err = got_error_from_errno(
3704 				    "alloc_commit_queue_entry");
3705 				break;
3706 			}
3707 			matched->commit = entry->commit;
3708 			got_object_commit_retain(entry->commit);
3709 
3710 			matched->idx = s->limit_commits.ncommits;
3711 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3712 			    matched, entry);
3713 			s->limit_commits.ncommits++;
3714 		}
3715 	}
3716 
3717 	/* Second process all the commits, until we fill the screen */
3718 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3719 	    !s->thread_args.log_complete) {
3720 		s->thread_args.commits_needed +=
3721 		    view->nlines - s->limit_commits.ncommits - 1;
3722 		err = trigger_log_thread(view, 1);
3723 		if (err)
3724 			return err;
3725 	}
3726 
3727 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3728 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3729 	s->selected = 0;
3730 
3731 	return NULL;
3732 }
3733 
3734 static const struct got_error *
3735 search_start_log_view(struct tog_view *view)
3736 {
3737 	struct tog_log_view_state *s = &view->state.log;
3738 
3739 	s->matched_entry = NULL;
3740 	s->search_entry = NULL;
3741 	return NULL;
3742 }
3743 
3744 static const struct got_error *
3745 search_next_log_view(struct tog_view *view)
3746 {
3747 	const struct got_error *err = NULL;
3748 	struct tog_log_view_state *s = &view->state.log;
3749 	struct commit_queue_entry *entry;
3750 
3751 	/* Display progress update in log view. */
3752 	show_log_view(view);
3753 	update_panels();
3754 	doupdate();
3755 
3756 	if (s->search_entry) {
3757 		if (!using_mock_io) {
3758 			int errcode, ch;
3759 
3760 			errcode = pthread_mutex_unlock(&tog_mutex);
3761 			if (errcode)
3762 				return got_error_set_errno(errcode,
3763 				    "pthread_mutex_unlock");
3764 			ch = wgetch(view->window);
3765 			errcode = pthread_mutex_lock(&tog_mutex);
3766 			if (errcode)
3767 				return got_error_set_errno(errcode,
3768 				    "pthread_mutex_lock");
3769 			if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3770 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3771 				return NULL;
3772 			}
3773 		}
3774 		if (view->searching == TOG_SEARCH_FORWARD)
3775 			entry = TAILQ_NEXT(s->search_entry, entry);
3776 		else
3777 			entry = TAILQ_PREV(s->search_entry,
3778 			    commit_queue_head, entry);
3779 	} else if (s->matched_entry) {
3780 		/*
3781 		 * If the user has moved the cursor after we hit a match,
3782 		 * the position from where we should continue searching
3783 		 * might have changed.
3784 		 */
3785 		if (view->searching == TOG_SEARCH_FORWARD)
3786 			entry = TAILQ_NEXT(s->selected_entry, entry);
3787 		else
3788 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3789 			    entry);
3790 	} else {
3791 		entry = s->selected_entry;
3792 	}
3793 
3794 	while (1) {
3795 		int have_match = 0;
3796 
3797 		if (entry == NULL) {
3798 			if (s->thread_args.log_complete ||
3799 			    view->searching == TOG_SEARCH_BACKWARD) {
3800 				view->search_next_done =
3801 				    (s->matched_entry == NULL ?
3802 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3803 				s->search_entry = NULL;
3804 				return NULL;
3805 			}
3806 			/*
3807 			 * Poke the log thread for more commits and return,
3808 			 * allowing the main loop to make progress. Search
3809 			 * will resume at s->search_entry once we come back.
3810 			 */
3811 			s->search_entry = s->selected_entry;
3812 			s->thread_args.commits_needed++;
3813 			return trigger_log_thread(view, 0);
3814 		}
3815 
3816 		err = match_commit(&have_match, entry->id, entry->commit,
3817 		    &view->regex);
3818 		if (err)
3819 			break;
3820 		if (have_match) {
3821 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3822 			s->matched_entry = entry;
3823 			break;
3824 		}
3825 
3826 		s->search_entry = entry;
3827 		if (view->searching == TOG_SEARCH_FORWARD)
3828 			entry = TAILQ_NEXT(entry, entry);
3829 		else
3830 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3831 	}
3832 
3833 	if (s->matched_entry) {
3834 		int cur = s->selected_entry->idx;
3835 		while (cur < s->matched_entry->idx) {
3836 			err = input_log_view(NULL, view, KEY_DOWN);
3837 			if (err)
3838 				return err;
3839 			cur++;
3840 		}
3841 		while (cur > s->matched_entry->idx) {
3842 			err = input_log_view(NULL, view, KEY_UP);
3843 			if (err)
3844 				return err;
3845 			cur--;
3846 		}
3847 	}
3848 
3849 	s->search_entry = NULL;
3850 
3851 	return NULL;
3852 }
3853 
3854 static const struct got_error *
3855 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3856     struct got_repository *repo, const char *head_ref_name,
3857     const char *in_repo_path, int log_branches,
3858     struct got_worktree *worktree)
3859 {
3860 	const struct got_error *err = NULL;
3861 	struct tog_log_view_state *s = &view->state.log;
3862 	struct got_repository *thread_repo = NULL;
3863 	struct got_commit_graph *thread_graph = NULL;
3864 	int errcode;
3865 
3866 	if (in_repo_path != s->in_repo_path) {
3867 		free(s->in_repo_path);
3868 		s->in_repo_path = strdup(in_repo_path);
3869 		if (s->in_repo_path == NULL) {
3870 			err = got_error_from_errno("strdup");
3871 			goto done;
3872 		}
3873 	}
3874 
3875 	/* The commit queue only contains commits being displayed. */
3876 	TAILQ_INIT(&s->real_commits.head);
3877 	s->real_commits.ncommits = 0;
3878 	s->commits = &s->real_commits;
3879 
3880 	TAILQ_INIT(&s->limit_commits.head);
3881 	s->limit_view = 0;
3882 	s->limit_commits.ncommits = 0;
3883 
3884 	s->repo = repo;
3885 	if (head_ref_name) {
3886 		s->head_ref_name = strdup(head_ref_name);
3887 		if (s->head_ref_name == NULL) {
3888 			err = got_error_from_errno("strdup");
3889 			goto done;
3890 		}
3891 	}
3892 	s->start_id = got_object_id_dup(start_id);
3893 	if (s->start_id == NULL) {
3894 		err = got_error_from_errno("got_object_id_dup");
3895 		goto done;
3896 	}
3897 	s->log_branches = log_branches;
3898 	s->use_committer = 1;
3899 
3900 	STAILQ_INIT(&s->colors);
3901 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3902 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3903 		    get_color_value("TOG_COLOR_COMMIT"));
3904 		if (err)
3905 			goto done;
3906 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3907 		    get_color_value("TOG_COLOR_AUTHOR"));
3908 		if (err)
3909 			goto done;
3910 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3911 		    get_color_value("TOG_COLOR_DATE"));
3912 		if (err)
3913 			goto done;
3914 	}
3915 
3916 	view->show = show_log_view;
3917 	view->input = input_log_view;
3918 	view->resize = resize_log_view;
3919 	view->close = close_log_view;
3920 	view->search_start = search_start_log_view;
3921 	view->search_next = search_next_log_view;
3922 
3923 	if (s->thread_args.pack_fds == NULL) {
3924 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3925 		if (err)
3926 			goto done;
3927 	}
3928 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3929 	    s->thread_args.pack_fds);
3930 	if (err)
3931 		goto done;
3932 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3933 	    !s->log_branches);
3934 	if (err)
3935 		goto done;
3936 	err = got_commit_graph_bfsort(thread_graph, s->start_id,
3937 	    s->repo, NULL, NULL);
3938 	if (err)
3939 		goto done;
3940 
3941 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3942 	if (errcode) {
3943 		err = got_error_set_errno(errcode, "pthread_cond_init");
3944 		goto done;
3945 	}
3946 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3947 	if (errcode) {
3948 		err = got_error_set_errno(errcode, "pthread_cond_init");
3949 		goto done;
3950 	}
3951 
3952 	if (using_mock_io) {
3953 		int rc;
3954 
3955 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3956 		if (rc)
3957 			return got_error_set_errno(rc, "pthread_cond_init");
3958 	}
3959 
3960 	s->thread_args.commits_needed = view->nlines;
3961 	s->thread_args.graph = thread_graph;
3962 	s->thread_args.real_commits = &s->real_commits;
3963 	s->thread_args.limit_commits = &s->limit_commits;
3964 	s->thread_args.in_repo_path = s->in_repo_path;
3965 	s->thread_args.start_id = s->start_id;
3966 	s->thread_args.repo = thread_repo;
3967 	s->thread_args.log_complete = 0;
3968 	s->thread_args.quit = &s->quit;
3969 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3970 	s->thread_args.selected_entry = &s->selected_entry;
3971 	s->thread_args.searching = &view->searching;
3972 	s->thread_args.search_next_done = &view->search_next_done;
3973 	s->thread_args.regex = &view->regex;
3974 	s->thread_args.limiting = &s->limit_view;
3975 	s->thread_args.limit_regex = &s->limit_regex;
3976 	s->thread_args.limit_commits = &s->limit_commits;
3977 	s->thread_args.worktree = worktree;
3978 	if (worktree)
3979 		s->thread_args.need_commit_marker = 1;
3980 done:
3981 	if (err) {
3982 		if (view->close == NULL)
3983 			close_log_view(view);
3984 		view_close(view);
3985 	}
3986 	return err;
3987 }
3988 
3989 static const struct got_error *
3990 show_log_view(struct tog_view *view)
3991 {
3992 	const struct got_error *err;
3993 	struct tog_log_view_state *s = &view->state.log;
3994 
3995 	if (s->thread == NULL) {
3996 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3997 		    &s->thread_args);
3998 		if (errcode)
3999 			return got_error_set_errno(errcode, "pthread_create");
4000 		if (s->thread_args.commits_needed > 0) {
4001 			err = trigger_log_thread(view, 1);
4002 			if (err)
4003 				return err;
4004 		}
4005 	}
4006 
4007 	return draw_commits(view);
4008 }
4009 
4010 static void
4011 log_move_cursor_up(struct tog_view *view, int page, int home)
4012 {
4013 	struct tog_log_view_state *s = &view->state.log;
4014 
4015 	if (s->first_displayed_entry == NULL)
4016 		return;
4017 	if (s->selected_entry->idx == 0)
4018 		view->count = 0;
4019 
4020 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
4021 	    || home)
4022 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
4023 
4024 	if (!page && !home && s->selected > 0)
4025 		--s->selected;
4026 	else
4027 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
4028 
4029 	select_commit(s);
4030 	return;
4031 }
4032 
4033 static const struct got_error *
4034 log_move_cursor_down(struct tog_view *view, int page)
4035 {
4036 	struct tog_log_view_state	*s = &view->state.log;
4037 	const struct got_error		*err = NULL;
4038 	int				 eos = view->nlines - 2;
4039 
4040 	if (s->first_displayed_entry == NULL)
4041 		return NULL;
4042 
4043 	if (s->thread_args.log_complete &&
4044 	    s->selected_entry->idx >= s->commits->ncommits - 1)
4045 		return NULL;
4046 
4047 	if (view_is_hsplit_top(view))
4048 		--eos;  /* border consumes the last line */
4049 
4050 	if (!page) {
4051 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
4052 			++s->selected;
4053 		else
4054 			err = log_scroll_down(view, 1);
4055 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
4056 		struct commit_queue_entry *entry;
4057 		int n;
4058 
4059 		s->selected = 0;
4060 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
4061 		s->last_displayed_entry = entry;
4062 		for (n = 0; n <= eos; n++) {
4063 			if (entry == NULL)
4064 				break;
4065 			s->first_displayed_entry = entry;
4066 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
4067 		}
4068 		if (n > 0)
4069 			s->selected = n - 1;
4070 	} else {
4071 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
4072 		    s->thread_args.log_complete)
4073 			s->selected += MIN(page,
4074 			    s->commits->ncommits - s->selected_entry->idx - 1);
4075 		else
4076 			err = log_scroll_down(view, page);
4077 	}
4078 	if (err)
4079 		return err;
4080 
4081 	/*
4082 	 * We might necessarily overshoot in horizontal
4083 	 * splits; if so, select the last displayed commit.
4084 	 */
4085 	if (view_is_hsplit_top(view) && s->first_displayed_entry &&
4086 	    s->last_displayed_entry) {
4087 		s->selected = MIN(s->selected,
4088 		    s->last_displayed_entry->idx -
4089 		    s->first_displayed_entry->idx);
4090 	}
4091 
4092 	select_commit(s);
4093 
4094 	if (s->thread_args.log_complete &&
4095 	    s->selected_entry->idx == s->commits->ncommits - 1)
4096 		view->count = 0;
4097 
4098 	return NULL;
4099 }
4100 
4101 static void
4102 view_get_split(struct tog_view *view, int *y, int *x)
4103 {
4104 	*x = 0;
4105 	*y = 0;
4106 
4107 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4108 		if (view->child && view->child->resized_y)
4109 			*y = view->child->resized_y;
4110 		else if (view->resized_y)
4111 			*y = view->resized_y;
4112 		else
4113 			*y = view_split_begin_y(view->lines);
4114 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4115 		if (view->child && view->child->resized_x)
4116 			*x = view->child->resized_x;
4117 		else if (view->resized_x)
4118 			*x = view->resized_x;
4119 		else
4120 			*x = view_split_begin_x(view->begin_x);
4121 	}
4122 }
4123 
4124 /* Split view horizontally at y and offset view->state->selected line. */
4125 static const struct got_error *
4126 view_init_hsplit(struct tog_view *view, int y)
4127 {
4128 	const struct got_error *err = NULL;
4129 
4130 	view->nlines = y;
4131 	view->ncols = COLS;
4132 	err = view_resize(view);
4133 	if (err)
4134 		return err;
4135 
4136 	err = offset_selection_down(view);
4137 
4138 	return err;
4139 }
4140 
4141 static const struct got_error *
4142 log_goto_line(struct tog_view *view, int nlines)
4143 {
4144 	const struct got_error		*err = NULL;
4145 	struct tog_log_view_state	*s = &view->state.log;
4146 	int				 g, idx = s->selected_entry->idx;
4147 
4148 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4149 		return NULL;
4150 
4151 	g = view->gline;
4152 	view->gline = 0;
4153 
4154 	if (g >= s->first_displayed_entry->idx + 1 &&
4155 	    g <= s->last_displayed_entry->idx + 1 &&
4156 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4157 		s->selected = g - s->first_displayed_entry->idx - 1;
4158 		select_commit(s);
4159 		return NULL;
4160 	}
4161 
4162 	if (idx + 1 < g) {
4163 		err = log_move_cursor_down(view, g - idx - 1);
4164 		if (!err && g > s->selected_entry->idx + 1)
4165 			err = log_move_cursor_down(view,
4166 			    g - s->first_displayed_entry->idx - 1);
4167 		if (err)
4168 			return err;
4169 	} else if (idx + 1 > g)
4170 		log_move_cursor_up(view, idx - g + 1, 0);
4171 
4172 	if (g < nlines && s->first_displayed_entry->idx == 0)
4173 		s->selected = g - 1;
4174 
4175 	select_commit(s);
4176 	return NULL;
4177 
4178 }
4179 
4180 static void
4181 horizontal_scroll_input(struct tog_view *view, int ch)
4182 {
4183 
4184 	switch (ch) {
4185 	case KEY_LEFT:
4186 	case 'h':
4187 		view->x -= MIN(view->x, 2);
4188 		if (view->x <= 0)
4189 			view->count = 0;
4190 		break;
4191 	case KEY_RIGHT:
4192 	case 'l':
4193 		if (view->x + view->ncols / 2 < view->maxx)
4194 			view->x += 2;
4195 		else
4196 			view->count = 0;
4197 		break;
4198 	case '0':
4199 		view->x = 0;
4200 		break;
4201 	case '$':
4202 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4203 		view->count = 0;
4204 		break;
4205 	default:
4206 		break;
4207 	}
4208 }
4209 
4210 static void
4211 log_mark_commit(struct tog_log_view_state *s)
4212 {
4213 	if (s->selected_entry == s->marked_entry)
4214 		s->marked_entry = NULL;
4215 	else
4216 		s->marked_entry = s->selected_entry;
4217 }
4218 
4219 static const struct got_error *
4220 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4221 {
4222 	const struct got_error *err = NULL;
4223 	struct tog_log_view_state *s = &view->state.log;
4224 	int eos, nscroll;
4225 
4226 	if (s->thread_args.load_all) {
4227 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4228 			s->thread_args.load_all = 0;
4229 		else if (s->thread_args.log_complete) {
4230 			err = log_move_cursor_down(view, s->commits->ncommits);
4231 			s->thread_args.load_all = 0;
4232 		}
4233 		if (err)
4234 			return err;
4235 	}
4236 
4237 	eos = nscroll = view->nlines - 1;
4238 	if (view_is_hsplit_top(view))
4239 		--eos;  /* border */
4240 
4241 	if (view->gline)
4242 		return log_goto_line(view, eos);
4243 
4244 	switch (ch) {
4245 	case '&':
4246 		err = limit_log_view(view);
4247 		break;
4248 	case 'q':
4249 		s->quit = 1;
4250 		break;
4251 	case '0':
4252 	case '$':
4253 	case KEY_RIGHT:
4254 	case 'l':
4255 	case KEY_LEFT:
4256 	case 'h':
4257 		horizontal_scroll_input(view, ch);
4258 		break;
4259 	case 'k':
4260 	case KEY_UP:
4261 	case '<':
4262 	case ',':
4263 	case CTRL('p'):
4264 		log_move_cursor_up(view, 0, 0);
4265 		break;
4266 	case 'g':
4267 	case '=':
4268 	case KEY_HOME:
4269 		log_move_cursor_up(view, 0, 1);
4270 		view->count = 0;
4271 		break;
4272 	case CTRL('u'):
4273 	case 'u':
4274 		nscroll /= 2;
4275 		/* FALL THROUGH */
4276 	case KEY_PPAGE:
4277 	case CTRL('b'):
4278 	case 'b':
4279 		log_move_cursor_up(view, nscroll, 0);
4280 		break;
4281 	case 'j':
4282 	case KEY_DOWN:
4283 	case '>':
4284 	case '.':
4285 	case CTRL('n'):
4286 		err = log_move_cursor_down(view, 0);
4287 		break;
4288 	case '@':
4289 		s->use_committer = !s->use_committer;
4290 		view->action = s->use_committer ?
4291 		    "show committer" : "show commit author";
4292 		break;
4293 	case 'G':
4294 	case '*':
4295 	case KEY_END: {
4296 		/* We don't know yet how many commits, so we're forced to
4297 		 * traverse them all. */
4298 		view->count = 0;
4299 		s->thread_args.load_all = 1;
4300 		if (!s->thread_args.log_complete)
4301 			return trigger_log_thread(view, 0);
4302 		err = log_move_cursor_down(view, s->commits->ncommits);
4303 		s->thread_args.load_all = 0;
4304 		break;
4305 	}
4306 	case CTRL('d'):
4307 	case 'd':
4308 		nscroll /= 2;
4309 		/* FALL THROUGH */
4310 	case KEY_NPAGE:
4311 	case CTRL('f'):
4312 	case 'f':
4313 	case ' ':
4314 		err = log_move_cursor_down(view, nscroll);
4315 		break;
4316 	case KEY_RESIZE:
4317 		if (s->selected > view->nlines - 2)
4318 			s->selected = view->nlines - 2;
4319 		if (s->selected > s->commits->ncommits - 1)
4320 			s->selected = s->commits->ncommits - 1;
4321 		select_commit(s);
4322 		if (s->commits->ncommits < view->nlines - 1 &&
4323 		    !s->thread_args.log_complete) {
4324 			s->thread_args.commits_needed += (view->nlines - 1) -
4325 			    s->commits->ncommits;
4326 			err = trigger_log_thread(view, 1);
4327 		}
4328 		break;
4329 	case KEY_ENTER:
4330 	case '\r':
4331 		view->count = 0;
4332 		if (s->selected_entry == NULL)
4333 			break;
4334 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4335 		break;
4336 	case 'T':
4337 		view->count = 0;
4338 		if (s->selected_entry == NULL)
4339 			break;
4340 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4341 		break;
4342 	case KEY_BACKSPACE:
4343 	case CTRL('l'):
4344 	case 'B':
4345 		view->count = 0;
4346 		if (ch == KEY_BACKSPACE &&
4347 		    got_path_is_root_dir(s->in_repo_path))
4348 			break;
4349 		err = stop_log_thread(s);
4350 		if (err)
4351 			return err;
4352 		if (ch == KEY_BACKSPACE) {
4353 			char *parent_path;
4354 			err = got_path_dirname(&parent_path, s->in_repo_path);
4355 			if (err)
4356 				return err;
4357 			free(s->in_repo_path);
4358 			s->in_repo_path = parent_path;
4359 			s->thread_args.in_repo_path = s->in_repo_path;
4360 		} else if (ch == CTRL('l')) {
4361 			struct got_object_id *start_id;
4362 			err = got_repo_match_object_id(&start_id, NULL,
4363 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4364 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4365 			if (err) {
4366 				if (s->head_ref_name == NULL ||
4367 				    err->code != GOT_ERR_NOT_REF)
4368 					return err;
4369 				/* Try to cope with deleted references. */
4370 				free(s->head_ref_name);
4371 				s->head_ref_name = NULL;
4372 				err = got_repo_match_object_id(&start_id,
4373 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4374 				    &tog_refs, s->repo);
4375 				if (err)
4376 					return err;
4377 			}
4378 			free(s->start_id);
4379 			s->start_id = start_id;
4380 			s->thread_args.start_id = s->start_id;
4381 		} else /* 'B' */
4382 			s->log_branches = !s->log_branches;
4383 
4384 		if (s->thread_args.pack_fds == NULL) {
4385 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4386 			if (err)
4387 				return err;
4388 		}
4389 		err = got_repo_open(&s->thread_args.repo,
4390 		    got_repo_get_path(s->repo), NULL,
4391 		    s->thread_args.pack_fds);
4392 		if (err)
4393 			return err;
4394 		tog_free_refs();
4395 		err = tog_load_refs(s->repo, 0);
4396 		if (err)
4397 			return err;
4398 		err = got_commit_graph_open(&s->thread_args.graph,
4399 		    s->in_repo_path, !s->log_branches);
4400 		if (err)
4401 			return err;
4402 		err = got_commit_graph_bfsort(s->thread_args.graph,
4403 		    s->start_id, s->repo, NULL, NULL);
4404 		if (err)
4405 			return err;
4406 		free_commits(&s->real_commits);
4407 		free_commits(&s->limit_commits);
4408 		s->first_displayed_entry = NULL;
4409 		s->last_displayed_entry = NULL;
4410 		s->selected_entry = NULL;
4411 		s->selected = 0;
4412 		s->thread_args.log_complete = 0;
4413 		s->quit = 0;
4414 		s->thread_args.commits_needed = view->lines;
4415 		s->matched_entry = NULL;
4416 		s->search_entry = NULL;
4417 		view->offset = 0;
4418 		break;
4419 	case 'm':
4420 		log_mark_commit(s);
4421 		break;
4422 	case 'R':
4423 		view->count = 0;
4424 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4425 		break;
4426 	default:
4427 		view->count = 0;
4428 		break;
4429 	}
4430 
4431 	return err;
4432 }
4433 
4434 static const struct got_error *
4435 apply_unveil(const char *repo_path, const char *worktree_path)
4436 {
4437 	const struct got_error *error;
4438 
4439 #ifdef PROFILE
4440 	if (unveil("gmon.out", "rwc") != 0)
4441 		return got_error_from_errno2("unveil", "gmon.out");
4442 #endif
4443 	if (repo_path && unveil(repo_path, "r") != 0)
4444 		return got_error_from_errno2("unveil", repo_path);
4445 
4446 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4447 		return got_error_from_errno2("unveil", worktree_path);
4448 
4449 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4450 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4451 
4452 	error = got_privsep_unveil_exec_helpers();
4453 	if (error != NULL)
4454 		return error;
4455 
4456 	if (unveil(NULL, NULL) != 0)
4457 		return got_error_from_errno("unveil");
4458 
4459 	return NULL;
4460 }
4461 
4462 static const struct got_error *
4463 init_mock_term(const char *test_script_path)
4464 {
4465 	const struct got_error	*err = NULL;
4466 	const char *screen_dump_path;
4467 	int in;
4468 
4469 	if (test_script_path == NULL || *test_script_path == '\0')
4470 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4471 
4472 	tog_io.f = fopen(test_script_path, "re");
4473 	if (tog_io.f == NULL) {
4474 		err = got_error_from_errno_fmt("fopen: %s",
4475 		    test_script_path);
4476 		goto done;
4477 	}
4478 
4479 	/* test mode, we don't want any output */
4480 	tog_io.cout = fopen("/dev/null", "w+");
4481 	if (tog_io.cout == NULL) {
4482 		err = got_error_from_errno2("fopen", "/dev/null");
4483 		goto done;
4484 	}
4485 
4486 	in = dup(fileno(tog_io.cout));
4487 	if (in == -1) {
4488 		err = got_error_from_errno("dup");
4489 		goto done;
4490 	}
4491 	tog_io.cin = fdopen(in, "r");
4492 	if (tog_io.cin == NULL) {
4493 		err = got_error_from_errno("fdopen");
4494 		close(in);
4495 		goto done;
4496 	}
4497 
4498 	screen_dump_path = getenv("TOG_SCR_DUMP");
4499 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4500 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4501 	tog_io.sdump = fopen(screen_dump_path, "we");
4502 	if (tog_io.sdump == NULL) {
4503 		err = got_error_from_errno2("fopen", screen_dump_path);
4504 		goto done;
4505 	}
4506 
4507 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4508 		err = got_error_from_errno("fseeko");
4509 		goto done;
4510 	}
4511 
4512 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4513 		err = got_error_msg(GOT_ERR_IO,
4514 		    "newterm: failed to initialise curses");
4515 
4516 	using_mock_io = 1;
4517 
4518 done:
4519 	if (err)
4520 		tog_io_close();
4521 	return err;
4522 }
4523 
4524 static void
4525 init_curses(void)
4526 {
4527 	if (using_mock_io) /* In test mode we use a fake terminal */
4528 		return;
4529 
4530 	initscr();
4531 
4532 	cbreak();
4533 	halfdelay(1); /* Fast refresh while initial view is loading. */
4534 	noecho();
4535 	nonl();
4536 	intrflush(stdscr, FALSE);
4537 	keypad(stdscr, TRUE);
4538 	curs_set(0);
4539 	if (getenv("TOG_COLORS") != NULL) {
4540 		start_color();
4541 		use_default_colors();
4542 	}
4543 
4544 	return;
4545 }
4546 
4547 static const struct got_error *
4548 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4549 {
4550 	tog_base_commit.id = got_object_id_dup(
4551 	    got_worktree_get_base_commit_id(worktree));
4552 	if (tog_base_commit.id == NULL)
4553 		return got_error_from_errno( "got_object_id_dup");
4554 
4555 	return NULL;
4556 }
4557 
4558 static const struct got_error *
4559 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4560     struct got_repository *repo, struct got_worktree *worktree)
4561 {
4562 	const struct got_error *err = NULL;
4563 
4564 	if (argc == 0) {
4565 		*in_repo_path = strdup("/");
4566 		if (*in_repo_path == NULL)
4567 			return got_error_from_errno("strdup");
4568 		return NULL;
4569 	}
4570 
4571 	if (worktree) {
4572 		const char *prefix = got_worktree_get_path_prefix(worktree);
4573 		char *p;
4574 
4575 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4576 		if (err)
4577 			return err;
4578 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4579 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4580 		    p) == -1) {
4581 			err = got_error_from_errno("asprintf");
4582 			*in_repo_path = NULL;
4583 		}
4584 		free(p);
4585 	} else
4586 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4587 
4588 	return err;
4589 }
4590 
4591 static const struct got_error *
4592 cmd_log(int argc, char *argv[])
4593 {
4594 	const struct got_error *error;
4595 	struct got_repository *repo = NULL;
4596 	struct got_worktree *worktree = NULL;
4597 	struct got_object_id *start_id = NULL;
4598 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4599 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4600 	struct got_reference *ref = NULL;
4601 	const char *head_ref_name = NULL;
4602 	int ch, log_branches = 0;
4603 	struct tog_view *view;
4604 	int *pack_fds = NULL;
4605 
4606 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4607 		switch (ch) {
4608 		case 'b':
4609 			log_branches = 1;
4610 			break;
4611 		case 'c':
4612 			start_commit = optarg;
4613 			break;
4614 		case 'r':
4615 			repo_path = realpath(optarg, NULL);
4616 			if (repo_path == NULL)
4617 				return got_error_from_errno2("realpath",
4618 				    optarg);
4619 			break;
4620 		default:
4621 			usage_log();
4622 			/* NOTREACHED */
4623 		}
4624 	}
4625 
4626 	argc -= optind;
4627 	argv += optind;
4628 
4629 	if (argc > 1)
4630 		usage_log();
4631 
4632 	error = got_repo_pack_fds_open(&pack_fds);
4633 	if (error != NULL)
4634 		goto done;
4635 
4636 	if (repo_path == NULL) {
4637 		cwd = getcwd(NULL, 0);
4638 		if (cwd == NULL) {
4639 			error = got_error_from_errno("getcwd");
4640 			goto done;
4641 		}
4642 		error = got_worktree_open(&worktree, cwd, NULL);
4643 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4644 			goto done;
4645 		if (worktree)
4646 			repo_path =
4647 			    strdup(got_worktree_get_repo_path(worktree));
4648 		else
4649 			repo_path = strdup(cwd);
4650 		if (repo_path == NULL) {
4651 			error = got_error_from_errno("strdup");
4652 			goto done;
4653 		}
4654 	}
4655 
4656 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4657 	if (error != NULL)
4658 		goto done;
4659 
4660 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4661 	    repo, worktree);
4662 	if (error)
4663 		goto done;
4664 
4665 	init_curses();
4666 
4667 	error = apply_unveil(got_repo_get_path(repo),
4668 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4669 	if (error)
4670 		goto done;
4671 
4672 	/* already loaded by tog_log_with_path()? */
4673 	if (TAILQ_EMPTY(&tog_refs)) {
4674 		error = tog_load_refs(repo, 0);
4675 		if (error)
4676 			goto done;
4677 	}
4678 
4679 	if (start_commit == NULL) {
4680 		error = got_repo_match_object_id(&start_id, &label,
4681 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4682 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4683 		if (error)
4684 			goto done;
4685 		head_ref_name = label;
4686 	} else {
4687 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4688 		    repo, worktree);
4689 		if (error != NULL)
4690 			goto done;
4691 		if (keyword_idstr != NULL)
4692 			start_commit = keyword_idstr;
4693 
4694 		error = got_ref_open(&ref, repo, start_commit, 0);
4695 		if (error == NULL)
4696 			head_ref_name = got_ref_get_name(ref);
4697 		else if (error->code != GOT_ERR_NOT_REF)
4698 			goto done;
4699 		error = got_repo_match_object_id(&start_id, NULL,
4700 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4701 		if (error)
4702 			goto done;
4703 	}
4704 
4705 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4706 	if (view == NULL) {
4707 		error = got_error_from_errno("view_open");
4708 		goto done;
4709 	}
4710 
4711 	if (worktree) {
4712 		error = set_tog_base_commit(repo, worktree);
4713 		if (error != NULL)
4714 			goto done;
4715 	}
4716 
4717 	error = open_log_view(view, start_id, repo, head_ref_name,
4718 	    in_repo_path, log_branches, worktree);
4719 	if (error)
4720 		goto done;
4721 
4722 	if (worktree) {
4723 		/* The work tree will be closed by the log thread. */
4724 		worktree = NULL;
4725 	}
4726 
4727 	error = view_loop(view);
4728 
4729 done:
4730 	free(tog_base_commit.id);
4731 	free(keyword_idstr);
4732 	free(in_repo_path);
4733 	free(repo_path);
4734 	free(cwd);
4735 	free(start_id);
4736 	free(label);
4737 	if (ref)
4738 		got_ref_close(ref);
4739 	if (repo) {
4740 		const struct got_error *close_err = got_repo_close(repo);
4741 		if (error == NULL)
4742 			error = close_err;
4743 	}
4744 	if (worktree)
4745 		got_worktree_close(worktree);
4746 	if (pack_fds) {
4747 		const struct got_error *pack_err =
4748 		    got_repo_pack_fds_close(pack_fds);
4749 		if (error == NULL)
4750 			error = pack_err;
4751 	}
4752 	tog_free_refs();
4753 	return error;
4754 }
4755 
4756 __dead static void
4757 usage_diff(void)
4758 {
4759 	endwin();
4760 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4761 	    "object1 object2\n", getprogname());
4762 	exit(1);
4763 }
4764 
4765 static int
4766 match_line(const char *line, regex_t *regex, size_t nmatch,
4767     regmatch_t *regmatch)
4768 {
4769 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4770 }
4771 
4772 static struct tog_color *
4773 match_color(struct tog_colors *colors, const char *line)
4774 {
4775 	struct tog_color *tc = NULL;
4776 
4777 	STAILQ_FOREACH(tc, colors, entry) {
4778 		if (match_line(line, &tc->regex, 0, NULL))
4779 			return tc;
4780 	}
4781 
4782 	return NULL;
4783 }
4784 
4785 static const struct got_error *
4786 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4787     WINDOW *window, int skipcol, regmatch_t *regmatch)
4788 {
4789 	const struct got_error *err = NULL;
4790 	char *exstr = NULL;
4791 	wchar_t *wline = NULL;
4792 	int rme, rms, n, width, scrollx;
4793 	int width0 = 0, width1 = 0, width2 = 0;
4794 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4795 
4796 	*wtotal = 0;
4797 
4798 	rms = regmatch->rm_so;
4799 	rme = regmatch->rm_eo;
4800 
4801 	err = expand_tab(&exstr, line);
4802 	if (err)
4803 		return err;
4804 
4805 	/* Split the line into 3 segments, according to match offsets. */
4806 	seg0 = strndup(exstr, rms);
4807 	if (seg0 == NULL) {
4808 		err = got_error_from_errno("strndup");
4809 		goto done;
4810 	}
4811 	seg1 = strndup(exstr + rms, rme - rms);
4812 	if (seg1 == NULL) {
4813 		err = got_error_from_errno("strndup");
4814 		goto done;
4815 	}
4816 	seg2 = strdup(exstr + rme);
4817 	if (seg2 == NULL) {
4818 		err = got_error_from_errno("strndup");
4819 		goto done;
4820 	}
4821 
4822 	/* draw up to matched token if we haven't scrolled past it */
4823 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4824 	    col_tab_align, 1);
4825 	if (err)
4826 		goto done;
4827 	n = MAX(width0 - skipcol, 0);
4828 	if (n) {
4829 		free(wline);
4830 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4831 		    wlimit, col_tab_align, 1);
4832 		if (err)
4833 			goto done;
4834 		waddwstr(window, &wline[scrollx]);
4835 		wlimit -= width;
4836 		*wtotal += width;
4837 	}
4838 
4839 	if (wlimit > 0) {
4840 		int i = 0, w = 0;
4841 		size_t wlen;
4842 
4843 		free(wline);
4844 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4845 		    col_tab_align, 1);
4846 		if (err)
4847 			goto done;
4848 		wlen = wcslen(wline);
4849 		while (i < wlen) {
4850 			width = wcwidth(wline[i]);
4851 			if (width == -1) {
4852 				/* should not happen, tabs are expanded */
4853 				err = got_error(GOT_ERR_RANGE);
4854 				goto done;
4855 			}
4856 			if (width0 + w + width > skipcol)
4857 				break;
4858 			w += width;
4859 			i++;
4860 		}
4861 		/* draw (visible part of) matched token (if scrolled into it) */
4862 		if (width1 - w > 0) {
4863 			wattron(window, A_STANDOUT);
4864 			waddwstr(window, &wline[i]);
4865 			wattroff(window, A_STANDOUT);
4866 			wlimit -= (width1 - w);
4867 			*wtotal += (width1 - w);
4868 		}
4869 	}
4870 
4871 	if (wlimit > 0) {  /* draw rest of line */
4872 		free(wline);
4873 		if (skipcol > width0 + width1) {
4874 			err = format_line(&wline, &width2, &scrollx, seg2,
4875 			    skipcol - (width0 + width1), wlimit,
4876 			    col_tab_align, 1);
4877 			if (err)
4878 				goto done;
4879 			waddwstr(window, &wline[scrollx]);
4880 		} else {
4881 			err = format_line(&wline, &width2, NULL, seg2, 0,
4882 			    wlimit, col_tab_align, 1);
4883 			if (err)
4884 				goto done;
4885 			waddwstr(window, wline);
4886 		}
4887 		*wtotal += width2;
4888 	}
4889 done:
4890 	free(wline);
4891 	free(exstr);
4892 	free(seg0);
4893 	free(seg1);
4894 	free(seg2);
4895 	return err;
4896 }
4897 
4898 static int
4899 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4900 {
4901 	FILE	*f = NULL;
4902 	int	*eof, *first, *selected;
4903 
4904 	if (view->type == TOG_VIEW_DIFF) {
4905 		struct tog_diff_view_state *s = &view->state.diff;
4906 
4907 		first = &s->first_displayed_line;
4908 		selected = first;
4909 		eof = &s->eof;
4910 		f = s->f;
4911 	} else if (view->type == TOG_VIEW_HELP) {
4912 		struct tog_help_view_state *s = &view->state.help;
4913 
4914 		first = &s->first_displayed_line;
4915 		selected = first;
4916 		eof = &s->eof;
4917 		f = s->f;
4918 	} else if (view->type == TOG_VIEW_BLAME) {
4919 		struct tog_blame_view_state *s = &view->state.blame;
4920 
4921 		first = &s->first_displayed_line;
4922 		selected = &s->selected_line;
4923 		eof = &s->eof;
4924 		f = s->blame.f;
4925 	} else
4926 		return 0;
4927 
4928 	/* Center gline in the middle of the page like vi(1). */
4929 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4930 		return 0;
4931 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4932 		rewind(f);
4933 		*eof = 0;
4934 		*first = 1;
4935 		*lineno = 0;
4936 		*nprinted = 0;
4937 		return 0;
4938 	}
4939 
4940 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4941 		view->gline : (view->nlines - 3) / 2 + 1;
4942 	view->gline = 0;
4943 
4944 	return 1;
4945 }
4946 
4947 static const struct got_error *
4948 draw_file(struct tog_view *view, const char *header)
4949 {
4950 	struct tog_diff_view_state *s = &view->state.diff;
4951 	regmatch_t *regmatch = &view->regmatch;
4952 	const struct got_error *err;
4953 	int nprinted = 0;
4954 	char *line;
4955 	size_t linesize = 0;
4956 	ssize_t linelen;
4957 	wchar_t *wline;
4958 	int width;
4959 	int max_lines = view->nlines;
4960 	int nlines = s->nlines;
4961 	off_t line_offset;
4962 
4963 	s->lineno = s->first_displayed_line - 1;
4964 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4965 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4966 		return got_error_from_errno("fseek");
4967 
4968 	werase(view->window);
4969 
4970 	if (view->gline > s->nlines - 1)
4971 		view->gline = s->nlines - 1;
4972 
4973 	if (header) {
4974 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4975 		    1 : view->gline - (view->nlines - 3) / 2 :
4976 		    s->lineno + s->selected_line;
4977 
4978 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4979 			return got_error_from_errno("asprintf");
4980 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4981 		    0, 0);
4982 		free(line);
4983 		if (err)
4984 			return err;
4985 
4986 		if (view_needs_focus_indication(view))
4987 			wstandout(view->window);
4988 		waddwstr(view->window, wline);
4989 		free(wline);
4990 		wline = NULL;
4991 		while (width++ < view->ncols)
4992 			waddch(view->window, ' ');
4993 		if (view_needs_focus_indication(view))
4994 			wstandend(view->window);
4995 
4996 		if (max_lines <= 1)
4997 			return NULL;
4998 		max_lines--;
4999 	}
5000 
5001 	s->eof = 0;
5002 	view->maxx = 0;
5003 	line = NULL;
5004 	while (max_lines > 0 && nprinted < max_lines) {
5005 		enum got_diff_line_type linetype;
5006 		attr_t attr = 0;
5007 
5008 		linelen = getline(&line, &linesize, s->f);
5009 		if (linelen == -1) {
5010 			if (feof(s->f)) {
5011 				s->eof = 1;
5012 				break;
5013 			}
5014 			free(line);
5015 			return got_ferror(s->f, GOT_ERR_IO);
5016 		}
5017 
5018 		if (++s->lineno < s->first_displayed_line)
5019 			continue;
5020 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
5021 			continue;
5022 		if (s->lineno == view->hiline)
5023 			attr = A_STANDOUT;
5024 
5025 		/* Set view->maxx based on full line length. */
5026 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
5027 		    view->x ? 1 : 0);
5028 		if (err) {
5029 			free(line);
5030 			return err;
5031 		}
5032 		view->maxx = MAX(view->maxx, width);
5033 		free(wline);
5034 		wline = NULL;
5035 
5036 		linetype = s->lines[s->lineno].type;
5037 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
5038 		    linetype < GOT_DIFF_LINE_CONTEXT)
5039 			attr |= COLOR_PAIR(linetype);
5040 		if (attr)
5041 			wattron(view->window, attr);
5042 		if (s->first_displayed_line + nprinted == s->matched_line &&
5043 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5044 			err = add_matched_line(&width, line, view->ncols, 0,
5045 			    view->window, view->x, regmatch);
5046 			if (err) {
5047 				free(line);
5048 				return err;
5049 			}
5050 		} else {
5051 			int skip;
5052 			err = format_line(&wline, &width, &skip, line,
5053 			    view->x, view->ncols, 0, view->x ? 1 : 0);
5054 			if (err) {
5055 				free(line);
5056 				return err;
5057 			}
5058 			waddwstr(view->window, &wline[skip]);
5059 			free(wline);
5060 			wline = NULL;
5061 		}
5062 		if (s->lineno == view->hiline) {
5063 			/* highlight full gline length */
5064 			while (width++ < view->ncols)
5065 				waddch(view->window, ' ');
5066 		} else {
5067 			if (width <= view->ncols - 1)
5068 				waddch(view->window, '\n');
5069 		}
5070 		if (attr)
5071 			wattroff(view->window, attr);
5072 		if (++nprinted == 1)
5073 			s->first_displayed_line = s->lineno;
5074 	}
5075 	free(line);
5076 	if (nprinted >= 1)
5077 		s->last_displayed_line = s->first_displayed_line +
5078 		    (nprinted - 1);
5079 	else
5080 		s->last_displayed_line = s->first_displayed_line;
5081 
5082 	view_border(view);
5083 
5084 	if (s->eof) {
5085 		while (nprinted < view->nlines) {
5086 			waddch(view->window, '\n');
5087 			nprinted++;
5088 		}
5089 
5090 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5091 		    view->ncols, 0, 0);
5092 		if (err) {
5093 			return err;
5094 		}
5095 
5096 		wstandout(view->window);
5097 		waddwstr(view->window, wline);
5098 		free(wline);
5099 		wline = NULL;
5100 		wstandend(view->window);
5101 	}
5102 
5103 	return NULL;
5104 }
5105 
5106 static char *
5107 get_datestr(time_t *time, char *datebuf)
5108 {
5109 	struct tm mytm, *tm;
5110 	char *p, *s;
5111 
5112 	tm = gmtime_r(time, &mytm);
5113 	if (tm == NULL)
5114 		return NULL;
5115 	s = asctime_r(tm, datebuf);
5116 	if (s == NULL)
5117 		return NULL;
5118 	p = strchr(s, '\n');
5119 	if (p)
5120 		*p = '\0';
5121 	return s;
5122 }
5123 
5124 static const struct got_error *
5125 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5126     off_t off, uint8_t type)
5127 {
5128 	struct got_diff_line *p;
5129 
5130 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5131 	if (p == NULL)
5132 		return got_error_from_errno("reallocarray");
5133 	*lines = p;
5134 	(*lines)[*nlines].offset = off;
5135 	(*lines)[*nlines].type = type;
5136 	(*nlines)++;
5137 
5138 	return NULL;
5139 }
5140 
5141 static const struct got_error *
5142 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5143     struct got_diff_line *s_lines, size_t s_nlines)
5144 {
5145 	struct got_diff_line	*p;
5146 	char			 buf[BUFSIZ];
5147 	size_t			 i, r;
5148 
5149 	if (fseeko(src, 0L, SEEK_SET) == -1)
5150 		return got_error_from_errno("fseeko");
5151 
5152 	for (;;) {
5153 		r = fread(buf, 1, sizeof(buf), src);
5154 		if (r == 0) {
5155 			if (ferror(src))
5156 				return got_error_from_errno("fread");
5157 			if (feof(src))
5158 				break;
5159 		}
5160 		if (fwrite(buf, 1, r, dst) != r)
5161 			return got_ferror(dst, GOT_ERR_IO);
5162 	}
5163 
5164 	if (s_nlines == 0 && *d_nlines == 0)
5165 		return NULL;
5166 
5167 	/*
5168 	 * If commit info was in dst, increment line offsets
5169 	 * of the appended diff content, but skip s_lines[0]
5170 	 * because offset zero is already in *d_lines.
5171 	 */
5172 	if (*d_nlines > 0) {
5173 		for (i = 1; i < s_nlines; ++i)
5174 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5175 
5176 		if (s_nlines > 0) {
5177 			--s_nlines;
5178 			++s_lines;
5179 		}
5180 	}
5181 
5182 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5183 	if (p == NULL) {
5184 		/* d_lines is freed in close_diff_view() */
5185 		return got_error_from_errno("reallocarray");
5186 	}
5187 
5188 	*d_lines = p;
5189 
5190 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5191 	*d_nlines += s_nlines;
5192 
5193 	return NULL;
5194 }
5195 
5196 static const struct got_error *
5197 write_diffstat(FILE *outfile, struct got_diff_line **lines, size_t *nlines,
5198     struct got_diffstat_cb_arg *dsa)
5199 {
5200 	const struct got_error		*err;
5201 	struct got_pathlist_entry	*pe;
5202 	off_t				 offset;
5203 	int				 n;
5204 
5205 	if (*nlines == 0) {
5206 		err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5207 		if (err != NULL)
5208 			return err;
5209 		offset = 0;
5210 	} else
5211 		offset = (*lines)[*nlines - 1].offset;
5212 
5213 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5214 		struct got_diff_changed_path *cp = pe->data;
5215 		int pad = dsa->max_path_len - pe->path_len + 1;
5216 
5217 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5218 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5219 		    dsa->rm_cols + 1, cp->rm);
5220 		if (n < 0)
5221 			return got_error_from_errno("fprintf");
5222 
5223 		offset += n;
5224 		err = add_line_metadata(lines, nlines, offset,
5225 		    GOT_DIFF_LINE_CHANGES);
5226 		if (err != NULL)
5227 			return err;
5228 	}
5229 
5230 	if (fputc('\n', outfile) == EOF)
5231 		return got_error_from_errno("fputc");
5232 
5233 	offset++;
5234 	err = add_line_metadata(lines, nlines, offset, GOT_DIFF_LINE_NONE);
5235 	if (err != NULL)
5236 		return err;
5237 
5238 	n = fprintf(outfile,
5239 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5240 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5241 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5242 	if (n < 0)
5243 		return got_error_from_errno("fprintf");
5244 
5245 	offset += n;
5246 	err = add_line_metadata(lines, nlines, offset, GOT_DIFF_LINE_NONE);
5247 	if (err != NULL)
5248 		return err;
5249 
5250 	if (fputc('\n', outfile) == EOF)
5251 		return got_error_from_errno("fputc");
5252 
5253 	offset++;
5254 	return add_line_metadata(lines, nlines, offset, GOT_DIFF_LINE_NONE);
5255 }
5256 
5257 static const struct got_error *
5258 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5259     struct got_object_id *commit_id, struct got_reflist_head *refs,
5260     struct got_repository *repo, int ignore_ws, int force_text_diff,
5261     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5262 {
5263 	const struct got_error *err = NULL;
5264 	char datebuf[26], *datestr;
5265 	struct got_commit_object *commit;
5266 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5267 	time_t committer_time;
5268 	const char *author, *committer;
5269 	char *refs_str = NULL;
5270 	off_t outoff = 0;
5271 	int n;
5272 
5273 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5274 	if (err)
5275 		return err;
5276 
5277 	err = got_object_open_as_commit(&commit, repo, commit_id);
5278 	if (err)
5279 		return err;
5280 
5281 	err = got_object_id_str(&id_str, commit_id);
5282 	if (err) {
5283 		err = got_error_from_errno("got_object_id_str");
5284 		goto done;
5285 	}
5286 
5287 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5288 	if (err)
5289 		goto done;
5290 
5291 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5292 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5293 	if (n < 0) {
5294 		err = got_error_from_errno("fprintf");
5295 		goto done;
5296 	}
5297 	outoff += n;
5298 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5299 	if (err)
5300 		goto done;
5301 
5302 	n = fprintf(outfile, "from: %s\n",
5303 	    got_object_commit_get_author(commit));
5304 	if (n < 0) {
5305 		err = got_error_from_errno("fprintf");
5306 		goto done;
5307 	}
5308 	outoff += n;
5309 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5310 	if (err)
5311 		goto done;
5312 
5313 	author = got_object_commit_get_author(commit);
5314 	committer = got_object_commit_get_committer(commit);
5315 	if (strcmp(author, committer) != 0) {
5316 		n = fprintf(outfile, "via: %s\n", committer);
5317 		if (n < 0) {
5318 			err = got_error_from_errno("fprintf");
5319 			goto done;
5320 		}
5321 		outoff += n;
5322 		err = add_line_metadata(lines, nlines, outoff,
5323 		    GOT_DIFF_LINE_AUTHOR);
5324 		if (err)
5325 			goto done;
5326 	}
5327 	committer_time = got_object_commit_get_committer_time(commit);
5328 	datestr = get_datestr(&committer_time, datebuf);
5329 	if (datestr) {
5330 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5331 		if (n < 0) {
5332 			err = got_error_from_errno("fprintf");
5333 			goto done;
5334 		}
5335 		outoff += n;
5336 		err = add_line_metadata(lines, nlines, outoff,
5337 		    GOT_DIFF_LINE_DATE);
5338 		if (err)
5339 			goto done;
5340 	}
5341 	if (got_object_commit_get_nparents(commit) > 1) {
5342 		const struct got_object_id_queue *parent_ids;
5343 		struct got_object_qid *qid;
5344 		int pn = 1;
5345 		parent_ids = got_object_commit_get_parent_ids(commit);
5346 		STAILQ_FOREACH(qid, parent_ids, entry) {
5347 			err = got_object_id_str(&id_str, &qid->id);
5348 			if (err)
5349 				goto done;
5350 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5351 			if (n < 0) {
5352 				err = got_error_from_errno("fprintf");
5353 				goto done;
5354 			}
5355 			outoff += n;
5356 			err = add_line_metadata(lines, nlines, outoff,
5357 			    GOT_DIFF_LINE_META);
5358 			if (err)
5359 				goto done;
5360 			free(id_str);
5361 			id_str = NULL;
5362 		}
5363 	}
5364 
5365 	err = got_object_commit_get_logmsg(&logmsg, commit);
5366 	if (err)
5367 		goto done;
5368 	s = logmsg;
5369 	while ((line = strsep(&s, "\n")) != NULL) {
5370 		n = fprintf(outfile, "%s\n", line);
5371 		if (n < 0) {
5372 			err = got_error_from_errno("fprintf");
5373 			goto done;
5374 		}
5375 		outoff += n;
5376 		err = add_line_metadata(lines, nlines, outoff,
5377 		    GOT_DIFF_LINE_LOGMSG);
5378 		if (err)
5379 			goto done;
5380 	}
5381 
5382 done:
5383 	free(id_str);
5384 	free(logmsg);
5385 	free(refs_str);
5386 	got_object_commit_close(commit);
5387 	return err;
5388 }
5389 
5390 static const struct got_error *
5391 create_diff(struct tog_diff_view_state *s)
5392 {
5393 	const struct got_error *err = NULL;
5394 	FILE *tmp_diff_file = NULL;
5395 	int obj_type;
5396 	struct got_diff_line *lines = NULL;
5397 	struct got_pathlist_head changed_paths;
5398 	struct got_commit_object *commit2 = NULL;
5399 	struct got_diffstat_cb_arg dsa;
5400 	size_t nlines = 0;
5401 
5402 	TAILQ_INIT(&changed_paths);
5403 	memset(&dsa, 0, sizeof(dsa));
5404 	dsa.paths = &changed_paths;
5405 	dsa.diff_algo = tog_diff_algo;
5406 	dsa.force_text = s->force_text_diff;
5407 	dsa.ignore_ws = s->ignore_whitespace;
5408 
5409 	free(s->lines);
5410 	s->lines = malloc(sizeof(*s->lines));
5411 	if (s->lines == NULL)
5412 		return got_error_from_errno("malloc");
5413 	s->nlines = 0;
5414 
5415 	if (s->f && fclose(s->f) == EOF) {
5416 		s->f = NULL;
5417 		return got_error_from_errno("fclose");
5418 	}
5419 
5420 	s->f = got_opentemp();
5421 	if (s->f == NULL)
5422 		return got_error_from_errno("got_opentemp");
5423 
5424 	/*
5425 	 * The diffstat requires the diff to be built first, but we want the
5426 	 * diffstat to precede the diff when displayed. Build the diff first
5427 	 * in the temporary file and write the diffstat and/or commit info to
5428 	 * the persistent file (s->f) from which views are drawn, then append
5429 	 * the diff from the temp file to the diffstat/commit info in s->f.
5430 	 */
5431 	tmp_diff_file = got_opentemp();
5432 	if (tmp_diff_file == NULL)
5433 		return got_error_from_errno("got_opentemp");
5434 
5435 	lines = malloc(sizeof(*lines));
5436 	if (lines == NULL) {
5437 		err = got_error_from_errno("malloc");
5438 		goto done;
5439 	}
5440 
5441 	if (s->id1)
5442 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5443 	else
5444 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5445 	if (err)
5446 		goto done;
5447 
5448 	switch (obj_type) {
5449 	case GOT_OBJ_TYPE_BLOB:
5450 		err = got_diff_objects_as_blobs(&lines, &nlines,
5451 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5452 		    NULL, NULL, tog_diff_algo, s->diff_context,
5453 		    s->ignore_whitespace, s->force_text_diff, &dsa, s->repo,
5454 		    tmp_diff_file);
5455 		if (err != NULL)
5456 			goto done;
5457 		break;
5458 	case GOT_OBJ_TYPE_TREE:
5459 		err = got_diff_objects_as_trees(&lines, &nlines,
5460 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5461 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5462 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5463 		if (err != NULL)
5464 			goto done;
5465 		break;
5466 	case GOT_OBJ_TYPE_COMMIT: {
5467 		const struct got_object_id_queue *parent_ids;
5468 		struct got_object_qid *pid;
5469 		struct got_reflist_head *refs;
5470 
5471 		err = got_diff_objects_as_commits(&lines, &nlines,
5472 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5473 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5474 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5475 		if (err)
5476 			goto done;
5477 
5478 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5479 		/* Show commit info if we're diffing to a parent/root commit. */
5480 		if (s->id1 == NULL) {
5481 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5482 			    refs, s->repo, s->ignore_whitespace,
5483 			    s->force_text_diff, &dsa, s->f);
5484 			if (err)
5485 				goto done;
5486 		} else {
5487 			err = got_object_open_as_commit(&commit2, s->repo,
5488 			    s->id2);
5489 			if (err)
5490 				goto done;
5491 
5492 			parent_ids = got_object_commit_get_parent_ids(commit2);
5493 			STAILQ_FOREACH(pid, parent_ids, entry) {
5494 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5495 					err = write_commit_info(&s->lines,
5496 					    &s->nlines, s->id2, refs, s->repo,
5497 					    s->ignore_whitespace,
5498 					    s->force_text_diff, &dsa, s->f);
5499 					if (err)
5500 						goto done;
5501 					break;
5502 				}
5503 			}
5504 		}
5505 		break;
5506 	}
5507 	default:
5508 		err = got_error(GOT_ERR_OBJ_TYPE);
5509 		goto done;
5510 	}
5511 
5512 	err = write_diffstat(s->f, &s->lines, &s->nlines, &dsa);
5513 	if (err != NULL)
5514 		goto done;
5515 
5516 	err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5517 	    lines, nlines);
5518 
5519 done:
5520 	free(lines);
5521 	if (commit2 != NULL)
5522 		got_object_commit_close(commit2);
5523 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5524 	if (s->f && fflush(s->f) != 0 && err == NULL)
5525 		err = got_error_from_errno("fflush");
5526 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5527 		err = got_error_from_errno("fclose");
5528 	return err;
5529 }
5530 
5531 static void
5532 diff_view_indicate_progress(struct tog_view *view)
5533 {
5534 	mvwaddstr(view->window, 0, 0, "diffing...");
5535 	update_panels();
5536 	doupdate();
5537 }
5538 
5539 static const struct got_error *
5540 search_start_diff_view(struct tog_view *view)
5541 {
5542 	struct tog_diff_view_state *s = &view->state.diff;
5543 
5544 	s->matched_line = 0;
5545 	return NULL;
5546 }
5547 
5548 static void
5549 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5550     size_t *nlines, int **first, int **last, int **match, int **selected)
5551 {
5552 	struct tog_diff_view_state *s = &view->state.diff;
5553 
5554 	*f = s->f;
5555 	*nlines = s->nlines;
5556 	*line_offsets = NULL;
5557 	*match = &s->matched_line;
5558 	*first = &s->first_displayed_line;
5559 	*last = &s->last_displayed_line;
5560 	*selected = &s->selected_line;
5561 }
5562 
5563 static const struct got_error *
5564 search_next_view_match(struct tog_view *view)
5565 {
5566 	const struct got_error *err = NULL;
5567 	FILE *f;
5568 	int lineno;
5569 	char *line = NULL;
5570 	size_t linesize = 0;
5571 	ssize_t linelen;
5572 	off_t *line_offsets;
5573 	size_t nlines = 0;
5574 	int *first, *last, *match, *selected;
5575 
5576 	if (!view->search_setup)
5577 		return got_error_msg(GOT_ERR_NOT_IMPL,
5578 		    "view search not supported");
5579 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5580 	    &match, &selected);
5581 
5582 	if (!view->searching) {
5583 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5584 		return NULL;
5585 	}
5586 
5587 	if (*match) {
5588 		if (view->searching == TOG_SEARCH_FORWARD)
5589 			lineno = *first + 1;
5590 		else
5591 			lineno = *first - 1;
5592 	} else
5593 		lineno = *first - 1 + *selected;
5594 
5595 	while (1) {
5596 		off_t offset;
5597 
5598 		if (lineno <= 0 || lineno > nlines) {
5599 			if (*match == 0) {
5600 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5601 				break;
5602 			}
5603 
5604 			if (view->searching == TOG_SEARCH_FORWARD)
5605 				lineno = 1;
5606 			else
5607 				lineno = nlines;
5608 		}
5609 
5610 		offset = view->type == TOG_VIEW_DIFF ?
5611 		    view->state.diff.lines[lineno - 1].offset :
5612 		    line_offsets[lineno - 1];
5613 		if (fseeko(f, offset, SEEK_SET) != 0) {
5614 			free(line);
5615 			return got_error_from_errno("fseeko");
5616 		}
5617 		linelen = getline(&line, &linesize, f);
5618 		if (linelen != -1) {
5619 			char *exstr;
5620 			err = expand_tab(&exstr, line);
5621 			if (err)
5622 				break;
5623 			if (match_line(exstr, &view->regex, 1,
5624 			    &view->regmatch)) {
5625 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5626 				*match = lineno;
5627 				free(exstr);
5628 				break;
5629 			}
5630 			free(exstr);
5631 		}
5632 		if (view->searching == TOG_SEARCH_FORWARD)
5633 			lineno++;
5634 		else
5635 			lineno--;
5636 	}
5637 	free(line);
5638 
5639 	if (*match) {
5640 		*first = *match;
5641 		*selected = 1;
5642 	}
5643 
5644 	return err;
5645 }
5646 
5647 static const struct got_error *
5648 close_diff_view(struct tog_view *view)
5649 {
5650 	const struct got_error *err = NULL;
5651 	struct tog_diff_view_state *s = &view->state.diff;
5652 
5653 	free(s->id1);
5654 	s->id1 = NULL;
5655 	free(s->id2);
5656 	s->id2 = NULL;
5657 	free(s->action);
5658 	s->action = NULL;
5659 	if (s->f && fclose(s->f) == EOF)
5660 		err = got_error_from_errno("fclose");
5661 	s->f = NULL;
5662 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5663 		err = got_error_from_errno("fclose");
5664 	s->f1 = NULL;
5665 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5666 		err = got_error_from_errno("fclose");
5667 	s->f2 = NULL;
5668 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5669 		err = got_error_from_errno("close");
5670 	s->fd1 = -1;
5671 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5672 		err = got_error_from_errno("close");
5673 	s->fd2 = -1;
5674 	free(s->lines);
5675 	s->lines = NULL;
5676 	s->nlines = 0;
5677 	return err;
5678 }
5679 
5680 static const struct got_error *
5681 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5682     struct got_object_id *id2, const char *label1, const char *label2,
5683     int diff_context, int ignore_whitespace, int force_text_diff,
5684     struct tog_view *parent_view, struct got_repository *repo)
5685 {
5686 	const struct got_error *err;
5687 	struct tog_diff_view_state *s = &view->state.diff;
5688 
5689 	memset(s, 0, sizeof(*s));
5690 	s->fd1 = -1;
5691 	s->fd2 = -1;
5692 
5693 	if (id1 != NULL && id2 != NULL) {
5694 		int type1, type2;
5695 
5696 		err = got_object_get_type(&type1, repo, id1);
5697 		if (err)
5698 			goto done;
5699 		err = got_object_get_type(&type2, repo, id2);
5700 		if (err)
5701 			goto done;
5702 
5703 		if (type1 != type2) {
5704 			err = got_error(GOT_ERR_OBJ_TYPE);
5705 			goto done;
5706 		}
5707 	}
5708 	s->first_displayed_line = 1;
5709 	s->last_displayed_line = view->nlines;
5710 	s->selected_line = 1;
5711 	s->repo = repo;
5712 	s->label1 = label1;
5713 	s->label2 = label2;
5714 
5715 	if (id1) {
5716 		s->id1 = got_object_id_dup(id1);
5717 		if (s->id1 == NULL) {
5718 			err = got_error_from_errno("got_object_id_dup");
5719 			goto done;
5720 		}
5721 	} else
5722 		s->id1 = NULL;
5723 
5724 	s->id2 = got_object_id_dup(id2);
5725 	if (s->id2 == NULL) {
5726 		err = got_error_from_errno("got_object_id_dup");
5727 		goto done;
5728 	}
5729 
5730 	s->f1 = got_opentemp();
5731 	if (s->f1 == NULL) {
5732 		err = got_error_from_errno("got_opentemp");
5733 		goto done;
5734 	}
5735 
5736 	s->f2 = got_opentemp();
5737 	if (s->f2 == NULL) {
5738 		err = got_error_from_errno("got_opentemp");
5739 		goto done;
5740 	}
5741 
5742 	s->fd1 = got_opentempfd();
5743 	if (s->fd1 == -1) {
5744 		err = got_error_from_errno("got_opentempfd");
5745 		goto done;
5746 	}
5747 
5748 	s->fd2 = got_opentempfd();
5749 	if (s->fd2 == -1) {
5750 		err = got_error_from_errno("got_opentempfd");
5751 		goto done;
5752 	}
5753 
5754 	s->diff_context = diff_context;
5755 	s->ignore_whitespace = ignore_whitespace;
5756 	s->force_text_diff = force_text_diff;
5757 	s->parent_view = parent_view;
5758 	s->repo = repo;
5759 
5760 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5761 		int rc;
5762 
5763 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5764 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5765 		if (rc != ERR)
5766 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5767 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5768 		if (rc != ERR)
5769 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5770 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5771 		if (rc != ERR)
5772 			rc = init_pair(GOT_DIFF_LINE_META,
5773 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5774 		if (rc != ERR)
5775 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5776 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5777 		if (rc != ERR)
5778 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5779 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5780 		if (rc != ERR)
5781 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5782 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5783 		if (rc != ERR)
5784 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5785 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5786 		if (rc != ERR)
5787 			rc = init_pair(GOT_DIFF_LINE_DATE,
5788 			    get_color_value("TOG_COLOR_DATE"), -1);
5789 		if (rc == ERR) {
5790 			err = got_error(GOT_ERR_RANGE);
5791 			goto done;
5792 		}
5793 	}
5794 
5795 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5796 	    view_is_splitscreen(view))
5797 		show_log_view(parent_view); /* draw border */
5798 	diff_view_indicate_progress(view);
5799 
5800 	err = create_diff(s);
5801 
5802 	view->show = show_diff_view;
5803 	view->input = input_diff_view;
5804 	view->reset = reset_diff_view;
5805 	view->close = close_diff_view;
5806 	view->search_start = search_start_diff_view;
5807 	view->search_setup = search_setup_diff_view;
5808 	view->search_next = search_next_view_match;
5809 done:
5810 	if (err) {
5811 		if (view->close == NULL)
5812 			close_diff_view(view);
5813 		view_close(view);
5814 	}
5815 	return err;
5816 }
5817 
5818 static const struct got_error *
5819 show_diff_view(struct tog_view *view)
5820 {
5821 	const struct got_error *err;
5822 	struct tog_diff_view_state *s = &view->state.diff;
5823 	char *id_str1 = NULL, *id_str2, *header;
5824 	const char *label1, *label2;
5825 
5826 	if (s->id1) {
5827 		err = got_object_id_str(&id_str1, s->id1);
5828 		if (err)
5829 			return err;
5830 		label1 = s->label1 ? s->label1 : id_str1;
5831 	} else
5832 		label1 = "/dev/null";
5833 
5834 	err = got_object_id_str(&id_str2, s->id2);
5835 	if (err)
5836 		return err;
5837 	label2 = s->label2 ? s->label2 : id_str2;
5838 
5839 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5840 		err = got_error_from_errno("asprintf");
5841 		free(id_str1);
5842 		free(id_str2);
5843 		return err;
5844 	}
5845 	free(id_str1);
5846 	free(id_str2);
5847 
5848 	err = draw_file(view, header);
5849 	free(header);
5850 	return err;
5851 }
5852 
5853 static const struct got_error *
5854 diff_write_patch(struct tog_view *view)
5855 {
5856 	const struct got_error		*err;
5857 	struct tog_diff_view_state	*s = &view->state.diff;
5858 	FILE				*f = NULL;
5859 	char				 buf[BUFSIZ], pathbase[PATH_MAX];
5860 	char				*idstr2, *idstr1 = NULL, *path = NULL;
5861 	size_t				 r;
5862 	off_t				 pos;
5863 	int				 rc;
5864 
5865 	if (s->action != NULL) {
5866 		free(s->action);
5867 		s->action = NULL;
5868 	}
5869 
5870 	pos = ftello(s->f);
5871 	if (pos == -1)
5872 		return got_error_from_errno("ftello");
5873 	if (fseeko(s->f, 0L, SEEK_SET) == -1)
5874 		return got_error_from_errno("fseeko");
5875 
5876 	if (s->id1 != NULL) {
5877 		err = got_object_id_str(&idstr1, s->id1);
5878 		if (err != NULL)
5879 			return err;
5880 	}
5881 	err = got_object_id_str(&idstr2, s->id2);
5882 	if (err != NULL)
5883 		goto done;
5884 
5885 	rc = snprintf(pathbase, sizeof(pathbase), "%s/tog-%.8s-%.8s",
5886 	    GOT_TMPDIR_STR, idstr1 != NULL ? idstr1 : "empty", idstr2);
5887 	if (rc < 0 || (size_t)rc >= sizeof(pathbase)) {
5888 		err = got_error(rc < 0 ? GOT_ERR_IO : GOT_ERR_NO_SPACE);
5889 		goto done;
5890 	}
5891 
5892 	err = got_opentemp_named(&path, &f, pathbase, ".diff");
5893 	if (err != NULL)
5894 		goto done;
5895 
5896 	while ((r = fread(buf, 1, sizeof(buf), s->f)) > 0) {
5897 		if (fwrite(buf, 1, r, f) != r) {
5898 			err = got_ferror(f, GOT_ERR_IO);
5899 			goto done;
5900 		}
5901 	}
5902 
5903 	if (ferror(s->f)) {
5904 		err = got_error_from_errno("fread");
5905 		goto done;
5906 	}
5907 	if (fseeko(s->f, pos, SEEK_SET) == -1) {
5908 		err = got_error_from_errno("fseeko");
5909 		goto done;
5910 	}
5911 
5912 	if (fflush(f) == EOF) {
5913 		err = got_error_from_errno2("fflush", path);
5914 		goto done;
5915 	}
5916 
5917 	if (asprintf(&s->action, "patch file written to %s", path) == -1) {
5918 		err = got_error_from_errno("asprintf");
5919 		goto done;
5920 	}
5921 
5922 	view->action = s->action;
5923 
5924 done:
5925 	if (f != NULL && fclose(f) == EOF && err == NULL)
5926 		err = got_error_from_errno2("fclose", path);
5927 	free(path);
5928 	free(idstr1);
5929 	free(idstr2);
5930 	return err;
5931 }
5932 
5933 static const struct got_error *
5934 set_selected_commit(struct tog_diff_view_state *s,
5935     struct commit_queue_entry *entry)
5936 {
5937 	const struct got_error *err;
5938 	const struct got_object_id_queue *parent_ids;
5939 	struct got_commit_object *selected_commit;
5940 	struct got_object_qid *pid;
5941 
5942 	free(s->id2);
5943 	s->id2 = got_object_id_dup(entry->id);
5944 	if (s->id2 == NULL)
5945 		return got_error_from_errno("got_object_id_dup");
5946 
5947 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5948 	if (err)
5949 		return err;
5950 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5951 	free(s->id1);
5952 	pid = STAILQ_FIRST(parent_ids);
5953 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5954 	got_object_commit_close(selected_commit);
5955 	return NULL;
5956 }
5957 
5958 static const struct got_error *
5959 reset_diff_view(struct tog_view *view)
5960 {
5961 	struct tog_diff_view_state *s = &view->state.diff;
5962 
5963 	view->count = 0;
5964 	wclear(view->window);
5965 	s->first_displayed_line = 1;
5966 	s->last_displayed_line = view->nlines;
5967 	s->matched_line = 0;
5968 	if (s->action != NULL) {
5969 		free(s->action);
5970 		s->action = NULL;
5971 	}
5972 	diff_view_indicate_progress(view);
5973 	return create_diff(s);
5974 }
5975 
5976 static void
5977 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5978 {
5979 	int start, i;
5980 
5981 	i = start = s->first_displayed_line - 1;
5982 
5983 	while (s->lines[i].type != type) {
5984 		if (i == 0)
5985 			i = s->nlines - 1;
5986 		if (--i == start)
5987 			return; /* do nothing, requested type not in file */
5988 	}
5989 
5990 	s->selected_line = 1;
5991 	s->first_displayed_line = i;
5992 }
5993 
5994 static void
5995 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5996 {
5997 	int start, i;
5998 
5999 	i = start = s->first_displayed_line + 1;
6000 
6001 	while (s->lines[i].type != type) {
6002 		if (i == s->nlines - 1)
6003 			i = 0;
6004 		if (++i == start)
6005 			return; /* do nothing, requested type not in file */
6006 	}
6007 
6008 	s->selected_line = 1;
6009 	s->first_displayed_line = i;
6010 }
6011 
6012 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
6013     int, int, int);
6014 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
6015     int, int);
6016 
6017 static const struct got_error *
6018 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
6019 {
6020 	const struct got_error *err = NULL;
6021 	struct tog_diff_view_state *s = &view->state.diff;
6022 	struct tog_log_view_state *ls;
6023 	struct commit_queue_entry *old_selected_entry;
6024 	char *line = NULL;
6025 	size_t linesize = 0;
6026 	ssize_t linelen;
6027 	int i, nscroll = view->nlines - 1, up = 0;
6028 
6029 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
6030 
6031 	if (s->action != NULL && ch != ERR) {
6032 		free(s->action);
6033 		s->action = NULL;
6034 		view->action = NULL;
6035 	}
6036 
6037 	switch (ch) {
6038 	case '0':
6039 	case '$':
6040 	case KEY_RIGHT:
6041 	case 'l':
6042 	case KEY_LEFT:
6043 	case 'h':
6044 		horizontal_scroll_input(view, ch);
6045 		break;
6046 	case 'a':
6047 	case 'w':
6048 		if (ch == 'a') {
6049 			s->force_text_diff = !s->force_text_diff;
6050 			view->action = s->force_text_diff ?
6051 			    "force ASCII text enabled" :
6052 			    "force ASCII text disabled";
6053 		}
6054 		else if (ch == 'w') {
6055 			s->ignore_whitespace = !s->ignore_whitespace;
6056 			view->action = s->ignore_whitespace ?
6057 			    "ignore whitespace enabled" :
6058 			    "ignore whitespace disabled";
6059 		}
6060 		err = reset_diff_view(view);
6061 		break;
6062 	case 'g':
6063 	case KEY_HOME:
6064 		s->first_displayed_line = 1;
6065 		view->count = 0;
6066 		break;
6067 	case 'G':
6068 	case KEY_END:
6069 		view->count = 0;
6070 		if (s->eof)
6071 			break;
6072 
6073 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
6074 		s->eof = 1;
6075 		break;
6076 	case 'k':
6077 	case KEY_UP:
6078 	case CTRL('p'):
6079 		if (s->first_displayed_line > 1)
6080 			s->first_displayed_line--;
6081 		else
6082 			view->count = 0;
6083 		break;
6084 	case CTRL('u'):
6085 	case 'u':
6086 		nscroll /= 2;
6087 		/* FALL THROUGH */
6088 	case KEY_PPAGE:
6089 	case CTRL('b'):
6090 	case 'b':
6091 		if (s->first_displayed_line == 1) {
6092 			view->count = 0;
6093 			break;
6094 		}
6095 		i = 0;
6096 		while (i++ < nscroll && s->first_displayed_line > 1)
6097 			s->first_displayed_line--;
6098 		break;
6099 	case 'j':
6100 	case KEY_DOWN:
6101 	case CTRL('n'):
6102 		if (!s->eof)
6103 			s->first_displayed_line++;
6104 		else
6105 			view->count = 0;
6106 		break;
6107 	case CTRL('d'):
6108 	case 'd':
6109 		nscroll /= 2;
6110 		/* FALL THROUGH */
6111 	case KEY_NPAGE:
6112 	case CTRL('f'):
6113 	case 'f':
6114 	case ' ':
6115 		if (s->eof) {
6116 			view->count = 0;
6117 			break;
6118 		}
6119 		i = 0;
6120 		while (!s->eof && i++ < nscroll) {
6121 			linelen = getline(&line, &linesize, s->f);
6122 			s->first_displayed_line++;
6123 			if (linelen == -1) {
6124 				if (feof(s->f)) {
6125 					s->eof = 1;
6126 				} else
6127 					err = got_ferror(s->f, GOT_ERR_IO);
6128 				break;
6129 			}
6130 		}
6131 		free(line);
6132 		break;
6133 	case '(':
6134 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
6135 		break;
6136 	case ')':
6137 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
6138 		break;
6139 	case '{':
6140 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
6141 		break;
6142 	case '}':
6143 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
6144 		break;
6145 	case '[':
6146 		if (s->diff_context > 0) {
6147 			s->diff_context--;
6148 			s->matched_line = 0;
6149 			diff_view_indicate_progress(view);
6150 			err = create_diff(s);
6151 			if (s->first_displayed_line + view->nlines - 1 >
6152 			    s->nlines) {
6153 				s->first_displayed_line = 1;
6154 				s->last_displayed_line = view->nlines;
6155 			}
6156 		} else
6157 			view->count = 0;
6158 		break;
6159 	case ']':
6160 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
6161 			s->diff_context++;
6162 			s->matched_line = 0;
6163 			diff_view_indicate_progress(view);
6164 			err = create_diff(s);
6165 		} else
6166 			view->count = 0;
6167 		break;
6168 	case '<':
6169 	case ',':
6170 	case 'K':
6171 		up = 1;
6172 		/* FALL THROUGH */
6173 	case '>':
6174 	case '.':
6175 	case 'J':
6176 		if (s->parent_view == NULL) {
6177 			view->count = 0;
6178 			break;
6179 		}
6180 		s->parent_view->count = view->count;
6181 
6182 		if (s->parent_view->type == TOG_VIEW_LOG) {
6183 			ls = &s->parent_view->state.log;
6184 			old_selected_entry = ls->selected_entry;
6185 
6186 			err = input_log_view(NULL, s->parent_view,
6187 			    up ? KEY_UP : KEY_DOWN);
6188 			if (err)
6189 				break;
6190 			view->count = s->parent_view->count;
6191 
6192 			if (old_selected_entry == ls->selected_entry)
6193 				break;
6194 
6195 			log_mark_clear(ls);
6196 
6197 			err = set_selected_commit(s, ls->selected_entry);
6198 			if (err)
6199 				break;
6200 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
6201 			struct tog_blame_view_state *bs;
6202 			struct got_object_id *id, *prev_id;
6203 
6204 			bs = &s->parent_view->state.blame;
6205 			prev_id = get_annotation_for_line(bs->blame.lines,
6206 			    bs->blame.nlines, bs->last_diffed_line);
6207 
6208 			err = input_blame_view(&view, s->parent_view,
6209 			    up ? KEY_UP : KEY_DOWN);
6210 			if (err)
6211 				break;
6212 			view->count = s->parent_view->count;
6213 
6214 			if (prev_id == NULL)
6215 				break;
6216 			id = get_selected_commit_id(bs->blame.lines,
6217 			    bs->blame.nlines, bs->first_displayed_line,
6218 			    bs->selected_line);
6219 			if (id == NULL)
6220 				break;
6221 
6222 			if (!got_object_id_cmp(prev_id, id))
6223 				break;
6224 
6225 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6226 			if (err)
6227 				break;
6228 		}
6229 		s->first_displayed_line = 1;
6230 		s->last_displayed_line = view->nlines;
6231 		s->matched_line = 0;
6232 		view->x = 0;
6233 
6234 		diff_view_indicate_progress(view);
6235 		err = create_diff(s);
6236 		break;
6237 	case 'p':
6238 		err = diff_write_patch(view);
6239 		break;
6240 	default:
6241 		view->count = 0;
6242 		break;
6243 	}
6244 
6245 	return err;
6246 }
6247 
6248 static const struct got_error *
6249 cmd_diff(int argc, char *argv[])
6250 {
6251 	const struct got_error *error;
6252 	struct got_repository *repo = NULL;
6253 	struct got_worktree *worktree = NULL;
6254 	struct got_object_id *id1 = NULL, *id2 = NULL;
6255 	char *repo_path = NULL, *cwd = NULL;
6256 	char *id_str1 = NULL, *id_str2 = NULL;
6257 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6258 	char *label1 = NULL, *label2 = NULL;
6259 	int diff_context = 3, ignore_whitespace = 0;
6260 	int ch, force_text_diff = 0;
6261 	const char *errstr;
6262 	struct tog_view *view;
6263 	int *pack_fds = NULL;
6264 
6265 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6266 		switch (ch) {
6267 		case 'a':
6268 			force_text_diff = 1;
6269 			break;
6270 		case 'C':
6271 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6272 			    &errstr);
6273 			if (errstr != NULL)
6274 				errx(1, "number of context lines is %s: %s",
6275 				    errstr, errstr);
6276 			break;
6277 		case 'r':
6278 			repo_path = realpath(optarg, NULL);
6279 			if (repo_path == NULL)
6280 				return got_error_from_errno2("realpath",
6281 				    optarg);
6282 			got_path_strip_trailing_slashes(repo_path);
6283 			break;
6284 		case 'w':
6285 			ignore_whitespace = 1;
6286 			break;
6287 		default:
6288 			usage_diff();
6289 			/* NOTREACHED */
6290 		}
6291 	}
6292 
6293 	argc -= optind;
6294 	argv += optind;
6295 
6296 	if (argc == 0) {
6297 		usage_diff(); /* TODO show local worktree changes */
6298 	} else if (argc == 2) {
6299 		id_str1 = argv[0];
6300 		id_str2 = argv[1];
6301 	} else
6302 		usage_diff();
6303 
6304 	error = got_repo_pack_fds_open(&pack_fds);
6305 	if (error)
6306 		goto done;
6307 
6308 	if (repo_path == NULL) {
6309 		cwd = getcwd(NULL, 0);
6310 		if (cwd == NULL)
6311 			return got_error_from_errno("getcwd");
6312 		error = got_worktree_open(&worktree, cwd, NULL);
6313 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6314 			goto done;
6315 		if (worktree)
6316 			repo_path =
6317 			    strdup(got_worktree_get_repo_path(worktree));
6318 		else
6319 			repo_path = strdup(cwd);
6320 		if (repo_path == NULL) {
6321 			error = got_error_from_errno("strdup");
6322 			goto done;
6323 		}
6324 	}
6325 
6326 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6327 	if (error)
6328 		goto done;
6329 
6330 	init_curses();
6331 
6332 	error = apply_unveil(got_repo_get_path(repo), NULL);
6333 	if (error)
6334 		goto done;
6335 
6336 	error = tog_load_refs(repo, 0);
6337 	if (error)
6338 		goto done;
6339 
6340 	if (id_str1 != NULL) {
6341 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6342 		    repo, worktree);
6343 		if (error != NULL)
6344 			goto done;
6345 		if (keyword_idstr1 != NULL)
6346 			id_str1 = keyword_idstr1;
6347 	}
6348 	if (id_str2 != NULL) {
6349 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6350 		    repo, worktree);
6351 		if (error != NULL)
6352 			goto done;
6353 		if (keyword_idstr2 != NULL)
6354 			id_str2 = keyword_idstr2;
6355 	}
6356 
6357 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6358 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6359 	if (error)
6360 		goto done;
6361 
6362 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6363 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6364 	if (error)
6365 		goto done;
6366 
6367 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6368 	if (view == NULL) {
6369 		error = got_error_from_errno("view_open");
6370 		goto done;
6371 	}
6372 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6373 	    ignore_whitespace, force_text_diff, NULL,  repo);
6374 	if (error)
6375 		goto done;
6376 
6377 	if (worktree) {
6378 		error = set_tog_base_commit(repo, worktree);
6379 		if (error != NULL)
6380 			goto done;
6381 
6382 		/* Release work tree lock. */
6383 		got_worktree_close(worktree);
6384 		worktree = NULL;
6385 	}
6386 
6387 	error = view_loop(view);
6388 
6389 done:
6390 	free(tog_base_commit.id);
6391 	free(keyword_idstr1);
6392 	free(keyword_idstr2);
6393 	free(label1);
6394 	free(label2);
6395 	free(id1);
6396 	free(id2);
6397 	free(repo_path);
6398 	free(cwd);
6399 	if (repo) {
6400 		const struct got_error *close_err = got_repo_close(repo);
6401 		if (error == NULL)
6402 			error = close_err;
6403 	}
6404 	if (worktree)
6405 		got_worktree_close(worktree);
6406 	if (pack_fds) {
6407 		const struct got_error *pack_err =
6408 		    got_repo_pack_fds_close(pack_fds);
6409 		if (error == NULL)
6410 			error = pack_err;
6411 	}
6412 	tog_free_refs();
6413 	return error;
6414 }
6415 
6416 __dead static void
6417 usage_blame(void)
6418 {
6419 	endwin();
6420 	fprintf(stderr,
6421 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6422 	    getprogname());
6423 	exit(1);
6424 }
6425 
6426 struct tog_blame_line {
6427 	int annotated;
6428 	struct got_object_id *id;
6429 };
6430 
6431 static const struct got_error *
6432 draw_blame(struct tog_view *view)
6433 {
6434 	struct tog_blame_view_state *s = &view->state.blame;
6435 	struct tog_blame *blame = &s->blame;
6436 	regmatch_t *regmatch = &view->regmatch;
6437 	const struct got_error *err;
6438 	int lineno = 0, nprinted = 0;
6439 	char *line = NULL;
6440 	size_t linesize = 0;
6441 	ssize_t linelen;
6442 	wchar_t *wline;
6443 	int width;
6444 	struct tog_blame_line *blame_line;
6445 	struct got_object_id *prev_id = NULL;
6446 	char *id_str;
6447 	struct tog_color *tc;
6448 
6449 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6450 	if (err)
6451 		return err;
6452 
6453 	rewind(blame->f);
6454 	werase(view->window);
6455 
6456 	if (asprintf(&line, "commit %s", id_str) == -1) {
6457 		err = got_error_from_errno("asprintf");
6458 		free(id_str);
6459 		return err;
6460 	}
6461 
6462 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6463 	free(line);
6464 	line = NULL;
6465 	if (err)
6466 		return err;
6467 	if (view_needs_focus_indication(view))
6468 		wstandout(view->window);
6469 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6470 	if (tc)
6471 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6472 	waddwstr(view->window, wline);
6473 	while (width++ < view->ncols)
6474 		waddch(view->window, ' ');
6475 	if (tc)
6476 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6477 	if (view_needs_focus_indication(view))
6478 		wstandend(view->window);
6479 	free(wline);
6480 	wline = NULL;
6481 
6482 	if (view->gline > blame->nlines)
6483 		view->gline = blame->nlines;
6484 
6485 	if (tog_io.wait_for_ui) {
6486 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6487 		int rc;
6488 
6489 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6490 		if (rc)
6491 			return got_error_set_errno(rc, "pthread_cond_wait");
6492 		tog_io.wait_for_ui = 0;
6493 	}
6494 
6495 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6496 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6497 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6498 		free(id_str);
6499 		return got_error_from_errno("asprintf");
6500 	}
6501 	free(id_str);
6502 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6503 	free(line);
6504 	line = NULL;
6505 	if (err)
6506 		return err;
6507 	waddwstr(view->window, wline);
6508 	free(wline);
6509 	wline = NULL;
6510 	if (width < view->ncols - 1)
6511 		waddch(view->window, '\n');
6512 
6513 	s->eof = 0;
6514 	view->maxx = 0;
6515 	while (nprinted < view->nlines - 2) {
6516 		linelen = getline(&line, &linesize, blame->f);
6517 		if (linelen == -1) {
6518 			if (feof(blame->f)) {
6519 				s->eof = 1;
6520 				break;
6521 			}
6522 			free(line);
6523 			return got_ferror(blame->f, GOT_ERR_IO);
6524 		}
6525 		if (++lineno < s->first_displayed_line)
6526 			continue;
6527 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6528 			continue;
6529 
6530 		/* Set view->maxx based on full line length. */
6531 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6532 		if (err) {
6533 			free(line);
6534 			return err;
6535 		}
6536 		free(wline);
6537 		wline = NULL;
6538 		view->maxx = MAX(view->maxx, width);
6539 
6540 		if (nprinted == s->selected_line - 1)
6541 			wstandout(view->window);
6542 
6543 		if (blame->nlines > 0) {
6544 			blame_line = &blame->lines[lineno - 1];
6545 			if (blame_line->annotated && prev_id &&
6546 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6547 			    !(nprinted == s->selected_line - 1)) {
6548 				waddstr(view->window, "        ");
6549 			} else if (blame_line->annotated) {
6550 				char *id_str;
6551 				err = got_object_id_str(&id_str,
6552 				    blame_line->id);
6553 				if (err) {
6554 					free(line);
6555 					return err;
6556 				}
6557 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6558 				if (tc)
6559 					wattr_on(view->window,
6560 					    COLOR_PAIR(tc->colorpair), NULL);
6561 				wprintw(view->window, "%.8s", id_str);
6562 				if (tc)
6563 					wattr_off(view->window,
6564 					    COLOR_PAIR(tc->colorpair), NULL);
6565 				free(id_str);
6566 				prev_id = blame_line->id;
6567 			} else {
6568 				waddstr(view->window, "........");
6569 				prev_id = NULL;
6570 			}
6571 		} else {
6572 			waddstr(view->window, "........");
6573 			prev_id = NULL;
6574 		}
6575 
6576 		if (nprinted == s->selected_line - 1)
6577 			wstandend(view->window);
6578 		waddstr(view->window, " ");
6579 
6580 		if (view->ncols <= 9) {
6581 			width = 9;
6582 		} else if (s->first_displayed_line + nprinted ==
6583 		    s->matched_line &&
6584 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6585 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6586 			    view->window, view->x, regmatch);
6587 			if (err) {
6588 				free(line);
6589 				return err;
6590 			}
6591 			width += 9;
6592 		} else {
6593 			int skip;
6594 			err = format_line(&wline, &width, &skip, line,
6595 			    view->x, view->ncols - 9, 9, 1);
6596 			if (err) {
6597 				free(line);
6598 				return err;
6599 			}
6600 			waddwstr(view->window, &wline[skip]);
6601 			width += 9;
6602 			free(wline);
6603 			wline = NULL;
6604 		}
6605 
6606 		if (width <= view->ncols - 1)
6607 			waddch(view->window, '\n');
6608 		if (++nprinted == 1)
6609 			s->first_displayed_line = lineno;
6610 	}
6611 	free(line);
6612 	s->last_displayed_line = lineno;
6613 
6614 	view_border(view);
6615 
6616 	return NULL;
6617 }
6618 
6619 static const struct got_error *
6620 blame_cb(void *arg, int nlines, int lineno,
6621     struct got_commit_object *commit, struct got_object_id *id)
6622 {
6623 	const struct got_error *err = NULL;
6624 	struct tog_blame_cb_args *a = arg;
6625 	struct tog_blame_line *line;
6626 	int errcode;
6627 
6628 	if (nlines != a->nlines ||
6629 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6630 		return got_error(GOT_ERR_RANGE);
6631 
6632 	errcode = pthread_mutex_lock(&tog_mutex);
6633 	if (errcode)
6634 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6635 
6636 	if (*a->quit) {	/* user has quit the blame view */
6637 		err = got_error(GOT_ERR_ITER_COMPLETED);
6638 		goto done;
6639 	}
6640 
6641 	if (lineno == -1)
6642 		goto done; /* no change in this commit */
6643 
6644 	line = &a->lines[lineno - 1];
6645 	if (line->annotated)
6646 		goto done;
6647 
6648 	line->id = got_object_id_dup(id);
6649 	if (line->id == NULL) {
6650 		err = got_error_from_errno("got_object_id_dup");
6651 		goto done;
6652 	}
6653 	line->annotated = 1;
6654 done:
6655 	errcode = pthread_mutex_unlock(&tog_mutex);
6656 	if (errcode)
6657 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6658 	return err;
6659 }
6660 
6661 static void *
6662 blame_thread(void *arg)
6663 {
6664 	const struct got_error *err, *close_err;
6665 	struct tog_blame_thread_args *ta = arg;
6666 	struct tog_blame_cb_args *a = ta->cb_args;
6667 	int errcode, fd1 = -1, fd2 = -1;
6668 	FILE *f1 = NULL, *f2 = NULL;
6669 
6670 	fd1 = got_opentempfd();
6671 	if (fd1 == -1)
6672 		return (void *)got_error_from_errno("got_opentempfd");
6673 
6674 	fd2 = got_opentempfd();
6675 	if (fd2 == -1) {
6676 		err = got_error_from_errno("got_opentempfd");
6677 		goto done;
6678 	}
6679 
6680 	f1 = got_opentemp();
6681 	if (f1 == NULL) {
6682 		err = (void *)got_error_from_errno("got_opentemp");
6683 		goto done;
6684 	}
6685 	f2 = got_opentemp();
6686 	if (f2 == NULL) {
6687 		err = (void *)got_error_from_errno("got_opentemp");
6688 		goto done;
6689 	}
6690 
6691 	err = block_signals_used_by_main_thread();
6692 	if (err)
6693 		goto done;
6694 
6695 	err = got_blame(ta->path, a->commit_id, ta->repo,
6696 	    tog_diff_algo, blame_cb, ta->cb_args,
6697 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6698 	if (err && err->code == GOT_ERR_CANCELLED)
6699 		err = NULL;
6700 
6701 	errcode = pthread_mutex_lock(&tog_mutex);
6702 	if (errcode) {
6703 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6704 		goto done;
6705 	}
6706 
6707 	close_err = got_repo_close(ta->repo);
6708 	if (err == NULL)
6709 		err = close_err;
6710 	ta->repo = NULL;
6711 	*ta->complete = 1;
6712 
6713 	if (tog_io.wait_for_ui) {
6714 		errcode = pthread_cond_signal(&ta->blame_complete);
6715 		if (errcode && err == NULL)
6716 			err = got_error_set_errno(errcode,
6717 			    "pthread_cond_signal");
6718 	}
6719 
6720 	errcode = pthread_mutex_unlock(&tog_mutex);
6721 	if (errcode && err == NULL)
6722 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6723 
6724 done:
6725 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6726 		err = got_error_from_errno("close");
6727 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6728 		err = got_error_from_errno("close");
6729 	if (f1 && fclose(f1) == EOF && err == NULL)
6730 		err = got_error_from_errno("fclose");
6731 	if (f2 && fclose(f2) == EOF && err == NULL)
6732 		err = got_error_from_errno("fclose");
6733 
6734 	return (void *)err;
6735 }
6736 
6737 static struct got_object_id *
6738 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6739     int first_displayed_line, int selected_line)
6740 {
6741 	struct tog_blame_line *line;
6742 
6743 	if (nlines <= 0)
6744 		return NULL;
6745 
6746 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6747 	if (!line->annotated)
6748 		return NULL;
6749 
6750 	return line->id;
6751 }
6752 
6753 static struct got_object_id *
6754 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6755     int lineno)
6756 {
6757 	struct tog_blame_line *line;
6758 
6759 	if (nlines <= 0 || lineno >= nlines)
6760 		return NULL;
6761 
6762 	line = &lines[lineno - 1];
6763 	if (!line->annotated)
6764 		return NULL;
6765 
6766 	return line->id;
6767 }
6768 
6769 static const struct got_error *
6770 stop_blame(struct tog_blame *blame)
6771 {
6772 	const struct got_error *err = NULL;
6773 	int i;
6774 
6775 	if (blame->thread) {
6776 		int errcode;
6777 		errcode = pthread_mutex_unlock(&tog_mutex);
6778 		if (errcode)
6779 			return got_error_set_errno(errcode,
6780 			    "pthread_mutex_unlock");
6781 		errcode = pthread_join(blame->thread, (void **)&err);
6782 		if (errcode)
6783 			return got_error_set_errno(errcode, "pthread_join");
6784 		errcode = pthread_mutex_lock(&tog_mutex);
6785 		if (errcode)
6786 			return got_error_set_errno(errcode,
6787 			    "pthread_mutex_lock");
6788 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6789 			err = NULL;
6790 		blame->thread = NULL;
6791 	}
6792 	if (blame->thread_args.repo) {
6793 		const struct got_error *close_err;
6794 		close_err = got_repo_close(blame->thread_args.repo);
6795 		if (err == NULL)
6796 			err = close_err;
6797 		blame->thread_args.repo = NULL;
6798 	}
6799 	if (blame->f) {
6800 		if (fclose(blame->f) == EOF && err == NULL)
6801 			err = got_error_from_errno("fclose");
6802 		blame->f = NULL;
6803 	}
6804 	if (blame->lines) {
6805 		for (i = 0; i < blame->nlines; i++)
6806 			free(blame->lines[i].id);
6807 		free(blame->lines);
6808 		blame->lines = NULL;
6809 	}
6810 	free(blame->cb_args.commit_id);
6811 	blame->cb_args.commit_id = NULL;
6812 	if (blame->pack_fds) {
6813 		const struct got_error *pack_err =
6814 		    got_repo_pack_fds_close(blame->pack_fds);
6815 		if (err == NULL)
6816 			err = pack_err;
6817 		blame->pack_fds = NULL;
6818 	}
6819 	free(blame->line_offsets);
6820 	blame->line_offsets = NULL;
6821 	return err;
6822 }
6823 
6824 static const struct got_error *
6825 cancel_blame_view(void *arg)
6826 {
6827 	const struct got_error *err = NULL;
6828 	int *done = arg;
6829 	int errcode;
6830 
6831 	errcode = pthread_mutex_lock(&tog_mutex);
6832 	if (errcode)
6833 		return got_error_set_errno(errcode,
6834 		    "pthread_mutex_unlock");
6835 
6836 	if (*done)
6837 		err = got_error(GOT_ERR_CANCELLED);
6838 
6839 	errcode = pthread_mutex_unlock(&tog_mutex);
6840 	if (errcode)
6841 		return got_error_set_errno(errcode,
6842 		    "pthread_mutex_lock");
6843 
6844 	return err;
6845 }
6846 
6847 static const struct got_error *
6848 run_blame(struct tog_view *view)
6849 {
6850 	struct tog_blame_view_state *s = &view->state.blame;
6851 	struct tog_blame *blame = &s->blame;
6852 	const struct got_error *err = NULL;
6853 	struct got_commit_object *commit = NULL;
6854 	struct got_blob_object *blob = NULL;
6855 	struct got_repository *thread_repo = NULL;
6856 	struct got_object_id *obj_id = NULL;
6857 	int obj_type, fd = -1;
6858 	int *pack_fds = NULL;
6859 
6860 	err = got_object_open_as_commit(&commit, s->repo,
6861 	    &s->blamed_commit->id);
6862 	if (err)
6863 		return err;
6864 
6865 	fd = got_opentempfd();
6866 	if (fd == -1) {
6867 		err = got_error_from_errno("got_opentempfd");
6868 		goto done;
6869 	}
6870 
6871 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6872 	if (err)
6873 		goto done;
6874 
6875 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6876 	if (err)
6877 		goto done;
6878 
6879 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6880 		err = got_error(GOT_ERR_OBJ_TYPE);
6881 		goto done;
6882 	}
6883 
6884 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6885 	if (err)
6886 		goto done;
6887 	blame->f = got_opentemp();
6888 	if (blame->f == NULL) {
6889 		err = got_error_from_errno("got_opentemp");
6890 		goto done;
6891 	}
6892 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6893 	    &blame->line_offsets, blame->f, blob);
6894 	if (err)
6895 		goto done;
6896 	if (blame->nlines == 0) {
6897 		s->blame_complete = 1;
6898 		goto done;
6899 	}
6900 
6901 	/* Don't include \n at EOF in the blame line count. */
6902 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6903 		blame->nlines--;
6904 
6905 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6906 	if (blame->lines == NULL) {
6907 		err = got_error_from_errno("calloc");
6908 		goto done;
6909 	}
6910 
6911 	err = got_repo_pack_fds_open(&pack_fds);
6912 	if (err)
6913 		goto done;
6914 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6915 	    pack_fds);
6916 	if (err)
6917 		goto done;
6918 
6919 	blame->pack_fds = pack_fds;
6920 	blame->cb_args.view = view;
6921 	blame->cb_args.lines = blame->lines;
6922 	blame->cb_args.nlines = blame->nlines;
6923 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6924 	if (blame->cb_args.commit_id == NULL) {
6925 		err = got_error_from_errno("got_object_id_dup");
6926 		goto done;
6927 	}
6928 	blame->cb_args.quit = &s->done;
6929 
6930 	blame->thread_args.path = s->path;
6931 	blame->thread_args.repo = thread_repo;
6932 	blame->thread_args.cb_args = &blame->cb_args;
6933 	blame->thread_args.complete = &s->blame_complete;
6934 	blame->thread_args.cancel_cb = cancel_blame_view;
6935 	blame->thread_args.cancel_arg = &s->done;
6936 	s->blame_complete = 0;
6937 
6938 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6939 		s->first_displayed_line = 1;
6940 		s->last_displayed_line = view->nlines;
6941 		s->selected_line = 1;
6942 	}
6943 	s->matched_line = 0;
6944 
6945 done:
6946 	if (commit)
6947 		got_object_commit_close(commit);
6948 	if (fd != -1 && close(fd) == -1 && err == NULL)
6949 		err = got_error_from_errno("close");
6950 	if (blob)
6951 		got_object_blob_close(blob);
6952 	free(obj_id);
6953 	if (err)
6954 		stop_blame(blame);
6955 	return err;
6956 }
6957 
6958 static const struct got_error *
6959 open_blame_view(struct tog_view *view, char *path,
6960     struct got_object_id *commit_id, struct got_repository *repo)
6961 {
6962 	const struct got_error *err = NULL;
6963 	struct tog_blame_view_state *s = &view->state.blame;
6964 
6965 	STAILQ_INIT(&s->blamed_commits);
6966 
6967 	s->path = strdup(path);
6968 	if (s->path == NULL)
6969 		return got_error_from_errno("strdup");
6970 
6971 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6972 	if (err) {
6973 		free(s->path);
6974 		return err;
6975 	}
6976 
6977 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6978 	s->first_displayed_line = 1;
6979 	s->last_displayed_line = view->nlines;
6980 	s->selected_line = 1;
6981 	s->blame_complete = 0;
6982 	s->repo = repo;
6983 	s->commit_id = commit_id;
6984 	memset(&s->blame, 0, sizeof(s->blame));
6985 
6986 	STAILQ_INIT(&s->colors);
6987 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6988 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6989 		    get_color_value("TOG_COLOR_COMMIT"));
6990 		if (err)
6991 			return err;
6992 	}
6993 
6994 	view->show = show_blame_view;
6995 	view->input = input_blame_view;
6996 	view->reset = reset_blame_view;
6997 	view->close = close_blame_view;
6998 	view->search_start = search_start_blame_view;
6999 	view->search_setup = search_setup_blame_view;
7000 	view->search_next = search_next_view_match;
7001 
7002 	if (using_mock_io) {
7003 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
7004 		int rc;
7005 
7006 		rc = pthread_cond_init(&bta->blame_complete, NULL);
7007 		if (rc)
7008 			return got_error_set_errno(rc, "pthread_cond_init");
7009 	}
7010 
7011 	return run_blame(view);
7012 }
7013 
7014 static const struct got_error *
7015 close_blame_view(struct tog_view *view)
7016 {
7017 	const struct got_error *err = NULL;
7018 	struct tog_blame_view_state *s = &view->state.blame;
7019 
7020 	if (s->blame.thread)
7021 		err = stop_blame(&s->blame);
7022 
7023 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
7024 		struct got_object_qid *blamed_commit;
7025 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
7026 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7027 		got_object_qid_free(blamed_commit);
7028 	}
7029 
7030 	if (using_mock_io) {
7031 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
7032 		int rc;
7033 
7034 		rc = pthread_cond_destroy(&bta->blame_complete);
7035 		if (rc && err == NULL)
7036 			err = got_error_set_errno(rc, "pthread_cond_destroy");
7037 	}
7038 
7039 	free(s->path);
7040 	free_colors(&s->colors);
7041 	return err;
7042 }
7043 
7044 static const struct got_error *
7045 search_start_blame_view(struct tog_view *view)
7046 {
7047 	struct tog_blame_view_state *s = &view->state.blame;
7048 
7049 	s->matched_line = 0;
7050 	return NULL;
7051 }
7052 
7053 static void
7054 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
7055     size_t *nlines, int **first, int **last, int **match, int **selected)
7056 {
7057 	struct tog_blame_view_state *s = &view->state.blame;
7058 
7059 	*f = s->blame.f;
7060 	*nlines = s->blame.nlines;
7061 	*line_offsets = s->blame.line_offsets;
7062 	*match = &s->matched_line;
7063 	*first = &s->first_displayed_line;
7064 	*last = &s->last_displayed_line;
7065 	*selected = &s->selected_line;
7066 }
7067 
7068 static const struct got_error *
7069 show_blame_view(struct tog_view *view)
7070 {
7071 	const struct got_error *err = NULL;
7072 	struct tog_blame_view_state *s = &view->state.blame;
7073 	int errcode;
7074 
7075 	if (s->blame.thread == NULL && !s->blame_complete) {
7076 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
7077 		    &s->blame.thread_args);
7078 		if (errcode)
7079 			return got_error_set_errno(errcode, "pthread_create");
7080 
7081 		if (!using_mock_io)
7082 			halfdelay(1); /* fast refresh while annotating  */
7083 	}
7084 
7085 	if (s->blame_complete && !using_mock_io)
7086 		halfdelay(10); /* disable fast refresh */
7087 
7088 	err = draw_blame(view);
7089 
7090 	view_border(view);
7091 	return err;
7092 }
7093 
7094 static const struct got_error *
7095 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
7096     struct got_repository *repo, struct got_object_id *id)
7097 {
7098 	struct tog_view		*log_view;
7099 	const struct got_error	*err = NULL;
7100 
7101 	*new_view = NULL;
7102 
7103 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7104 	if (log_view == NULL)
7105 		return got_error_from_errno("view_open");
7106 
7107 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
7108 	if (err)
7109 		view_close(log_view);
7110 	else
7111 		*new_view = log_view;
7112 
7113 	return err;
7114 }
7115 
7116 static const struct got_error *
7117 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
7118 {
7119 	const struct got_error *err = NULL, *thread_err = NULL;
7120 	struct tog_view *diff_view;
7121 	struct tog_blame_view_state *s = &view->state.blame;
7122 	int eos, nscroll, begin_y = 0, begin_x = 0;
7123 
7124 	eos = nscroll = view->nlines - 2;
7125 	if (view_is_hsplit_top(view))
7126 		--eos;  /* border */
7127 
7128 	switch (ch) {
7129 	case '0':
7130 	case '$':
7131 	case KEY_RIGHT:
7132 	case 'l':
7133 	case KEY_LEFT:
7134 	case 'h':
7135 		horizontal_scroll_input(view, ch);
7136 		break;
7137 	case 'q':
7138 		s->done = 1;
7139 		break;
7140 	case 'g':
7141 	case KEY_HOME:
7142 		s->selected_line = 1;
7143 		s->first_displayed_line = 1;
7144 		view->count = 0;
7145 		break;
7146 	case 'G':
7147 	case KEY_END:
7148 		if (s->blame.nlines < eos) {
7149 			s->selected_line = s->blame.nlines;
7150 			s->first_displayed_line = 1;
7151 		} else {
7152 			s->selected_line = eos;
7153 			s->first_displayed_line = s->blame.nlines - (eos - 1);
7154 		}
7155 		view->count = 0;
7156 		break;
7157 	case 'k':
7158 	case KEY_UP:
7159 	case CTRL('p'):
7160 		if (s->selected_line > 1)
7161 			s->selected_line--;
7162 		else if (s->selected_line == 1 &&
7163 		    s->first_displayed_line > 1)
7164 			s->first_displayed_line--;
7165 		else
7166 			view->count = 0;
7167 		break;
7168 	case CTRL('u'):
7169 	case 'u':
7170 		nscroll /= 2;
7171 		/* FALL THROUGH */
7172 	case KEY_PPAGE:
7173 	case CTRL('b'):
7174 	case 'b':
7175 		if (s->first_displayed_line == 1) {
7176 			if (view->count > 1)
7177 				nscroll += nscroll;
7178 			s->selected_line = MAX(1, s->selected_line - nscroll);
7179 			view->count = 0;
7180 			break;
7181 		}
7182 		if (s->first_displayed_line > nscroll)
7183 			s->first_displayed_line -= nscroll;
7184 		else
7185 			s->first_displayed_line = 1;
7186 		break;
7187 	case 'j':
7188 	case KEY_DOWN:
7189 	case CTRL('n'):
7190 		if (s->selected_line < eos && s->first_displayed_line +
7191 		    s->selected_line <= s->blame.nlines)
7192 			s->selected_line++;
7193 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
7194 			s->first_displayed_line++;
7195 		else
7196 			view->count = 0;
7197 		break;
7198 	case 'c':
7199 	case 'p': {
7200 		struct got_object_id *id = NULL;
7201 
7202 		view->count = 0;
7203 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7204 		    s->first_displayed_line, s->selected_line);
7205 		if (id == NULL)
7206 			break;
7207 		if (ch == 'p') {
7208 			struct got_commit_object *commit, *pcommit;
7209 			struct got_object_qid *pid;
7210 			struct got_object_id *blob_id = NULL;
7211 			int obj_type;
7212 			err = got_object_open_as_commit(&commit,
7213 			    s->repo, id);
7214 			if (err)
7215 				break;
7216 			pid = STAILQ_FIRST(
7217 			    got_object_commit_get_parent_ids(commit));
7218 			if (pid == NULL) {
7219 				got_object_commit_close(commit);
7220 				break;
7221 			}
7222 			/* Check if path history ends here. */
7223 			err = got_object_open_as_commit(&pcommit,
7224 			    s->repo, &pid->id);
7225 			if (err)
7226 				break;
7227 			err = got_object_id_by_path(&blob_id, s->repo,
7228 			    pcommit, s->path);
7229 			got_object_commit_close(pcommit);
7230 			if (err) {
7231 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7232 					err = NULL;
7233 				got_object_commit_close(commit);
7234 				break;
7235 			}
7236 			err = got_object_get_type(&obj_type, s->repo,
7237 			    blob_id);
7238 			free(blob_id);
7239 			/* Can't blame non-blob type objects. */
7240 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7241 				got_object_commit_close(commit);
7242 				break;
7243 			}
7244 			err = got_object_qid_alloc(&s->blamed_commit,
7245 			    &pid->id);
7246 			got_object_commit_close(commit);
7247 		} else {
7248 			if (got_object_id_cmp(id,
7249 			    &s->blamed_commit->id) == 0)
7250 				break;
7251 			err = got_object_qid_alloc(&s->blamed_commit,
7252 			    id);
7253 		}
7254 		if (err)
7255 			break;
7256 		s->done = 1;
7257 		thread_err = stop_blame(&s->blame);
7258 		s->done = 0;
7259 		if (thread_err)
7260 			break;
7261 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7262 		    s->blamed_commit, entry);
7263 		err = run_blame(view);
7264 		if (err)
7265 			break;
7266 		break;
7267 	}
7268 	case 'C': {
7269 		struct got_object_qid *first;
7270 
7271 		view->count = 0;
7272 		first = STAILQ_FIRST(&s->blamed_commits);
7273 		if (!got_object_id_cmp(&first->id, s->commit_id))
7274 			break;
7275 		s->done = 1;
7276 		thread_err = stop_blame(&s->blame);
7277 		s->done = 0;
7278 		if (thread_err)
7279 			break;
7280 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7281 		got_object_qid_free(s->blamed_commit);
7282 		s->blamed_commit =
7283 		    STAILQ_FIRST(&s->blamed_commits);
7284 		err = run_blame(view);
7285 		if (err)
7286 			break;
7287 		break;
7288 	}
7289 	case 'L':
7290 		view->count = 0;
7291 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7292 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7293 		if (s->id_to_log)
7294 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7295 		break;
7296 	case KEY_ENTER:
7297 	case '\r': {
7298 		struct got_object_id *id = NULL;
7299 		struct got_object_qid *pid;
7300 		struct got_commit_object *commit = NULL;
7301 
7302 		view->count = 0;
7303 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7304 		    s->first_displayed_line, s->selected_line);
7305 		if (id == NULL)
7306 			break;
7307 		err = got_object_open_as_commit(&commit, s->repo, id);
7308 		if (err)
7309 			break;
7310 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7311 		if (*new_view) {
7312 			/* traversed from diff view, release diff resources  */
7313 			err = close_diff_view(*new_view);
7314 			if (err)
7315 				break;
7316 			diff_view = *new_view;
7317 		} else {
7318 			if (view_is_parent_view(view))
7319 				view_get_split(view, &begin_y, &begin_x);
7320 
7321 			diff_view = view_open(0, 0, begin_y, begin_x,
7322 			    TOG_VIEW_DIFF);
7323 			if (diff_view == NULL) {
7324 				got_object_commit_close(commit);
7325 				err = got_error_from_errno("view_open");
7326 				break;
7327 			}
7328 		}
7329 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7330 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7331 		got_object_commit_close(commit);
7332 		if (err)
7333 			break;
7334 		s->last_diffed_line = s->first_displayed_line - 1 +
7335 		    s->selected_line;
7336 		if (*new_view)
7337 			break;	/* still open from active diff view */
7338 		if (view_is_parent_view(view) &&
7339 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7340 			err = view_init_hsplit(view, begin_y);
7341 			if (err)
7342 				break;
7343 		}
7344 
7345 		view->focussed = 0;
7346 		diff_view->focussed = 1;
7347 		diff_view->mode = view->mode;
7348 		diff_view->nlines = view->lines - begin_y;
7349 		if (view_is_parent_view(view)) {
7350 			view_transfer_size(diff_view, view);
7351 			err = view_close_child(view);
7352 			if (err)
7353 				break;
7354 			err = view_set_child(view, diff_view);
7355 			if (err)
7356 				break;
7357 			view->focus_child = 1;
7358 		} else
7359 			*new_view = diff_view;
7360 		if (err)
7361 			break;
7362 		break;
7363 	}
7364 	case CTRL('d'):
7365 	case 'd':
7366 		nscroll /= 2;
7367 		/* FALL THROUGH */
7368 	case KEY_NPAGE:
7369 	case CTRL('f'):
7370 	case 'f':
7371 	case ' ':
7372 		if (s->last_displayed_line >= s->blame.nlines &&
7373 		    s->selected_line >= MIN(s->blame.nlines,
7374 		    view->nlines - 2)) {
7375 			view->count = 0;
7376 			break;
7377 		}
7378 		if (s->last_displayed_line >= s->blame.nlines &&
7379 		    s->selected_line < view->nlines - 2) {
7380 			s->selected_line +=
7381 			    MIN(nscroll, s->last_displayed_line -
7382 			    s->first_displayed_line - s->selected_line + 1);
7383 		}
7384 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7385 			s->first_displayed_line += nscroll;
7386 		else
7387 			s->first_displayed_line =
7388 			    s->blame.nlines - (view->nlines - 3);
7389 		break;
7390 	case KEY_RESIZE:
7391 		if (s->selected_line > view->nlines - 2) {
7392 			s->selected_line = MIN(s->blame.nlines,
7393 			    view->nlines - 2);
7394 		}
7395 		break;
7396 	default:
7397 		view->count = 0;
7398 		break;
7399 	}
7400 	return thread_err ? thread_err : err;
7401 }
7402 
7403 static const struct got_error *
7404 reset_blame_view(struct tog_view *view)
7405 {
7406 	const struct got_error *err;
7407 	struct tog_blame_view_state *s = &view->state.blame;
7408 
7409 	view->count = 0;
7410 	s->done = 1;
7411 	err = stop_blame(&s->blame);
7412 	s->done = 0;
7413 	if (err)
7414 		return err;
7415 	return run_blame(view);
7416 }
7417 
7418 static const struct got_error *
7419 cmd_blame(int argc, char *argv[])
7420 {
7421 	const struct got_error *error;
7422 	struct got_repository *repo = NULL;
7423 	struct got_worktree *worktree = NULL;
7424 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7425 	char *link_target = NULL;
7426 	struct got_object_id *commit_id = NULL;
7427 	struct got_commit_object *commit = NULL;
7428 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7429 	int ch;
7430 	struct tog_view *view = NULL;
7431 	int *pack_fds = NULL;
7432 
7433 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7434 		switch (ch) {
7435 		case 'c':
7436 			commit_id_str = optarg;
7437 			break;
7438 		case 'r':
7439 			repo_path = realpath(optarg, NULL);
7440 			if (repo_path == NULL)
7441 				return got_error_from_errno2("realpath",
7442 				    optarg);
7443 			break;
7444 		default:
7445 			usage_blame();
7446 			/* NOTREACHED */
7447 		}
7448 	}
7449 
7450 	argc -= optind;
7451 	argv += optind;
7452 
7453 	if (argc != 1)
7454 		usage_blame();
7455 
7456 	error = got_repo_pack_fds_open(&pack_fds);
7457 	if (error != NULL)
7458 		goto done;
7459 
7460 	if (repo_path == NULL) {
7461 		cwd = getcwd(NULL, 0);
7462 		if (cwd == NULL)
7463 			return got_error_from_errno("getcwd");
7464 		error = got_worktree_open(&worktree, cwd, NULL);
7465 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7466 			goto done;
7467 		if (worktree)
7468 			repo_path =
7469 			    strdup(got_worktree_get_repo_path(worktree));
7470 		else
7471 			repo_path = strdup(cwd);
7472 		if (repo_path == NULL) {
7473 			error = got_error_from_errno("strdup");
7474 			goto done;
7475 		}
7476 	}
7477 
7478 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7479 	if (error != NULL)
7480 		goto done;
7481 
7482 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7483 	    worktree);
7484 	if (error)
7485 		goto done;
7486 
7487 	init_curses();
7488 
7489 	error = apply_unveil(got_repo_get_path(repo), NULL);
7490 	if (error)
7491 		goto done;
7492 
7493 	error = tog_load_refs(repo, 0);
7494 	if (error)
7495 		goto done;
7496 
7497 	if (commit_id_str == NULL) {
7498 		struct got_reference *head_ref;
7499 		error = got_ref_open(&head_ref, repo, worktree ?
7500 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7501 		if (error != NULL)
7502 			goto done;
7503 		error = got_ref_resolve(&commit_id, repo, head_ref);
7504 		got_ref_close(head_ref);
7505 	} else {
7506 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7507 		    repo, worktree);
7508 		if (error != NULL)
7509 			goto done;
7510 		if (keyword_idstr != NULL)
7511 			commit_id_str = keyword_idstr;
7512 
7513 		error = got_repo_match_object_id(&commit_id, NULL,
7514 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7515 	}
7516 	if (error != NULL)
7517 		goto done;
7518 
7519 	error = got_object_open_as_commit(&commit, repo, commit_id);
7520 	if (error)
7521 		goto done;
7522 
7523 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7524 	    commit, repo);
7525 	if (error)
7526 		goto done;
7527 
7528 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7529 	if (view == NULL) {
7530 		error = got_error_from_errno("view_open");
7531 		goto done;
7532 	}
7533 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7534 	    commit_id, repo);
7535 	if (error != NULL) {
7536 		if (view->close == NULL)
7537 			close_blame_view(view);
7538 		view_close(view);
7539 		goto done;
7540 	}
7541 
7542 	if (worktree) {
7543 		error = set_tog_base_commit(repo, worktree);
7544 		if (error != NULL)
7545 			goto done;
7546 
7547 		/* Release work tree lock. */
7548 		got_worktree_close(worktree);
7549 		worktree = NULL;
7550 	}
7551 
7552 	error = view_loop(view);
7553 
7554 done:
7555 	free(tog_base_commit.id);
7556 	free(repo_path);
7557 	free(in_repo_path);
7558 	free(link_target);
7559 	free(cwd);
7560 	free(commit_id);
7561 	free(keyword_idstr);
7562 	if (commit)
7563 		got_object_commit_close(commit);
7564 	if (worktree)
7565 		got_worktree_close(worktree);
7566 	if (repo) {
7567 		const struct got_error *close_err = got_repo_close(repo);
7568 		if (error == NULL)
7569 			error = close_err;
7570 	}
7571 	if (pack_fds) {
7572 		const struct got_error *pack_err =
7573 		    got_repo_pack_fds_close(pack_fds);
7574 		if (error == NULL)
7575 			error = pack_err;
7576 	}
7577 	tog_free_refs();
7578 	return error;
7579 }
7580 
7581 static const struct got_error *
7582 draw_tree_entries(struct tog_view *view, const char *parent_path)
7583 {
7584 	struct tog_tree_view_state *s = &view->state.tree;
7585 	const struct got_error *err = NULL;
7586 	struct got_tree_entry *te;
7587 	wchar_t *wline;
7588 	char *index = NULL;
7589 	struct tog_color *tc;
7590 	int width, n, nentries, scrollx, i = 1;
7591 	int limit = view->nlines;
7592 
7593 	s->ndisplayed = 0;
7594 	if (view_is_hsplit_top(view))
7595 		--limit;  /* border */
7596 
7597 	werase(view->window);
7598 
7599 	if (limit == 0)
7600 		return NULL;
7601 
7602 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7603 	    0, 0);
7604 	if (err)
7605 		return err;
7606 	if (view_needs_focus_indication(view))
7607 		wstandout(view->window);
7608 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7609 	if (tc)
7610 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7611 	waddwstr(view->window, wline);
7612 	free(wline);
7613 	wline = NULL;
7614 	while (width++ < view->ncols)
7615 		waddch(view->window, ' ');
7616 	if (tc)
7617 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7618 	if (view_needs_focus_indication(view))
7619 		wstandend(view->window);
7620 	if (--limit <= 0)
7621 		return NULL;
7622 
7623 	i += s->selected;
7624 	if (s->first_displayed_entry) {
7625 		i += got_tree_entry_get_index(s->first_displayed_entry);
7626 		if (s->tree != s->root)
7627 			++i;  /* account for ".." entry */
7628 	}
7629 	nentries = got_object_tree_get_nentries(s->tree);
7630 	if (asprintf(&index, "[%d/%d] %s",
7631 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7632 		return got_error_from_errno("asprintf");
7633 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7634 	free(index);
7635 	if (err)
7636 		return err;
7637 	waddwstr(view->window, wline);
7638 	free(wline);
7639 	wline = NULL;
7640 	if (width < view->ncols - 1)
7641 		waddch(view->window, '\n');
7642 	if (--limit <= 0)
7643 		return NULL;
7644 	waddch(view->window, '\n');
7645 	if (--limit <= 0)
7646 		return NULL;
7647 
7648 	if (s->first_displayed_entry == NULL) {
7649 		te = got_object_tree_get_first_entry(s->tree);
7650 		if (s->selected == 0) {
7651 			if (view->focussed)
7652 				wstandout(view->window);
7653 			s->selected_entry = NULL;
7654 		}
7655 		waddstr(view->window, "  ..\n");	/* parent directory */
7656 		if (s->selected == 0 && view->focussed)
7657 			wstandend(view->window);
7658 		s->ndisplayed++;
7659 		if (--limit <= 0)
7660 			return NULL;
7661 		n = 1;
7662 	} else {
7663 		n = 0;
7664 		te = s->first_displayed_entry;
7665 	}
7666 
7667 	view->maxx = 0;
7668 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7669 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7670 		const char *modestr = "";
7671 		mode_t mode;
7672 
7673 		te = got_object_tree_get_entry(s->tree, i);
7674 		mode = got_tree_entry_get_mode(te);
7675 
7676 		if (s->show_ids) {
7677 			err = got_object_id_str(&id_str,
7678 			    got_tree_entry_get_id(te));
7679 			if (err)
7680 				return got_error_from_errno(
7681 				    "got_object_id_str");
7682 		}
7683 		if (got_object_tree_entry_is_submodule(te))
7684 			modestr = "$";
7685 		else if (S_ISLNK(mode)) {
7686 			int i;
7687 
7688 			err = got_tree_entry_get_symlink_target(&link_target,
7689 			    te, s->repo);
7690 			if (err) {
7691 				free(id_str);
7692 				return err;
7693 			}
7694 			for (i = 0; link_target[i] != '\0'; i++) {
7695 				if (!isprint((unsigned char)link_target[i]))
7696 					link_target[i] = '?';
7697 			}
7698 			modestr = "@";
7699 		}
7700 		else if (S_ISDIR(mode))
7701 			modestr = "/";
7702 		else if (mode & S_IXUSR)
7703 			modestr = "*";
7704 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7705 		    got_tree_entry_get_name(te), modestr,
7706 		    link_target ? " -> ": "",
7707 		    link_target ? link_target : "") == -1) {
7708 			free(id_str);
7709 			free(link_target);
7710 			return got_error_from_errno("asprintf");
7711 		}
7712 		free(id_str);
7713 		free(link_target);
7714 
7715 		/* use full line width to determine view->maxx */
7716 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7717 		if (err) {
7718 			free(line);
7719 			break;
7720 		}
7721 		view->maxx = MAX(view->maxx, width);
7722 		free(wline);
7723 		wline = NULL;
7724 
7725 		err = format_line(&wline, &width, &scrollx, line, view->x,
7726 		    view->ncols, 0, 0);
7727 		if (err) {
7728 			free(line);
7729 			break;
7730 		}
7731 		if (n == s->selected) {
7732 			if (view->focussed)
7733 				wstandout(view->window);
7734 			s->selected_entry = te;
7735 		}
7736 		tc = match_color(&s->colors, line);
7737 		if (tc)
7738 			wattr_on(view->window,
7739 			    COLOR_PAIR(tc->colorpair), NULL);
7740 		waddwstr(view->window, &wline[scrollx]);
7741 		if (tc)
7742 			wattr_off(view->window,
7743 			    COLOR_PAIR(tc->colorpair), NULL);
7744 		if (width < view->ncols)
7745 			waddch(view->window, '\n');
7746 		if (n == s->selected && view->focussed)
7747 			wstandend(view->window);
7748 		free(line);
7749 		free(wline);
7750 		wline = NULL;
7751 		n++;
7752 		s->ndisplayed++;
7753 		s->last_displayed_entry = te;
7754 		if (--limit <= 0)
7755 			break;
7756 	}
7757 
7758 	return err;
7759 }
7760 
7761 static void
7762 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7763 {
7764 	struct got_tree_entry *te;
7765 	int isroot = s->tree == s->root;
7766 	int i = 0;
7767 
7768 	if (s->first_displayed_entry == NULL)
7769 		return;
7770 
7771 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7772 	while (i++ < maxscroll) {
7773 		if (te == NULL) {
7774 			if (!isroot)
7775 				s->first_displayed_entry = NULL;
7776 			break;
7777 		}
7778 		s->first_displayed_entry = te;
7779 		te = got_tree_entry_get_prev(s->tree, te);
7780 	}
7781 }
7782 
7783 static const struct got_error *
7784 tree_scroll_down(struct tog_view *view, int maxscroll)
7785 {
7786 	struct tog_tree_view_state *s = &view->state.tree;
7787 	struct got_tree_entry *next, *last;
7788 	int n = 0;
7789 
7790 	if (s->first_displayed_entry)
7791 		next = got_tree_entry_get_next(s->tree,
7792 		    s->first_displayed_entry);
7793 	else
7794 		next = got_object_tree_get_first_entry(s->tree);
7795 
7796 	last = s->last_displayed_entry;
7797 	while (next && n++ < maxscroll) {
7798 		if (last) {
7799 			s->last_displayed_entry = last;
7800 			last = got_tree_entry_get_next(s->tree, last);
7801 		}
7802 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7803 			s->first_displayed_entry = next;
7804 			next = got_tree_entry_get_next(s->tree, next);
7805 		}
7806 	}
7807 
7808 	return NULL;
7809 }
7810 
7811 static const struct got_error *
7812 tree_entry_path(char **path, struct tog_parent_trees *parents,
7813     struct got_tree_entry *te)
7814 {
7815 	const struct got_error *err = NULL;
7816 	struct tog_parent_tree *pt;
7817 	size_t len = 2; /* for leading slash and NUL */
7818 
7819 	TAILQ_FOREACH(pt, parents, entry)
7820 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7821 		    + 1 /* slash */;
7822 	if (te)
7823 		len += strlen(got_tree_entry_get_name(te));
7824 
7825 	*path = calloc(1, len);
7826 	if (path == NULL)
7827 		return got_error_from_errno("calloc");
7828 
7829 	(*path)[0] = '/';
7830 	pt = TAILQ_LAST(parents, tog_parent_trees);
7831 	while (pt) {
7832 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7833 		if (strlcat(*path, name, len) >= len) {
7834 			err = got_error(GOT_ERR_NO_SPACE);
7835 			goto done;
7836 		}
7837 		if (strlcat(*path, "/", len) >= len) {
7838 			err = got_error(GOT_ERR_NO_SPACE);
7839 			goto done;
7840 		}
7841 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7842 	}
7843 	if (te) {
7844 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7845 			err = got_error(GOT_ERR_NO_SPACE);
7846 			goto done;
7847 		}
7848 	}
7849 done:
7850 	if (err) {
7851 		free(*path);
7852 		*path = NULL;
7853 	}
7854 	return err;
7855 }
7856 
7857 static const struct got_error *
7858 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7859     struct got_tree_entry *te, struct tog_parent_trees *parents,
7860     struct got_object_id *commit_id, struct got_repository *repo)
7861 {
7862 	const struct got_error *err = NULL;
7863 	char *path;
7864 	struct tog_view *blame_view;
7865 
7866 	*new_view = NULL;
7867 
7868 	err = tree_entry_path(&path, parents, te);
7869 	if (err)
7870 		return err;
7871 
7872 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7873 	if (blame_view == NULL) {
7874 		err = got_error_from_errno("view_open");
7875 		goto done;
7876 	}
7877 
7878 	err = open_blame_view(blame_view, path, commit_id, repo);
7879 	if (err) {
7880 		if (err->code == GOT_ERR_CANCELLED)
7881 			err = NULL;
7882 		view_close(blame_view);
7883 	} else
7884 		*new_view = blame_view;
7885 done:
7886 	free(path);
7887 	return err;
7888 }
7889 
7890 static const struct got_error *
7891 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7892     struct tog_tree_view_state *s)
7893 {
7894 	struct tog_view *log_view;
7895 	const struct got_error *err = NULL;
7896 	char *path;
7897 
7898 	*new_view = NULL;
7899 
7900 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7901 	if (log_view == NULL)
7902 		return got_error_from_errno("view_open");
7903 
7904 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7905 	if (err)
7906 		return err;
7907 
7908 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7909 	    path, 0, NULL);
7910 	if (err)
7911 		view_close(log_view);
7912 	else
7913 		*new_view = log_view;
7914 	free(path);
7915 	return err;
7916 }
7917 
7918 static const struct got_error *
7919 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7920     const char *head_ref_name, struct got_repository *repo)
7921 {
7922 	const struct got_error *err = NULL;
7923 	char *commit_id_str = NULL;
7924 	struct tog_tree_view_state *s = &view->state.tree;
7925 	struct got_commit_object *commit = NULL;
7926 
7927 	TAILQ_INIT(&s->parents);
7928 	STAILQ_INIT(&s->colors);
7929 
7930 	s->commit_id = got_object_id_dup(commit_id);
7931 	if (s->commit_id == NULL) {
7932 		err = got_error_from_errno("got_object_id_dup");
7933 		goto done;
7934 	}
7935 
7936 	err = got_object_open_as_commit(&commit, repo, commit_id);
7937 	if (err)
7938 		goto done;
7939 
7940 	/*
7941 	 * The root is opened here and will be closed when the view is closed.
7942 	 * Any visited subtrees and their path-wise parents are opened and
7943 	 * closed on demand.
7944 	 */
7945 	err = got_object_open_as_tree(&s->root, repo,
7946 	    got_object_commit_get_tree_id(commit));
7947 	if (err)
7948 		goto done;
7949 	s->tree = s->root;
7950 
7951 	err = got_object_id_str(&commit_id_str, commit_id);
7952 	if (err != NULL)
7953 		goto done;
7954 
7955 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7956 		err = got_error_from_errno("asprintf");
7957 		goto done;
7958 	}
7959 
7960 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7961 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7962 	if (head_ref_name) {
7963 		s->head_ref_name = strdup(head_ref_name);
7964 		if (s->head_ref_name == NULL) {
7965 			err = got_error_from_errno("strdup");
7966 			goto done;
7967 		}
7968 	}
7969 	s->repo = repo;
7970 
7971 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7972 		err = add_color(&s->colors, "\\$$",
7973 		    TOG_COLOR_TREE_SUBMODULE,
7974 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7975 		if (err)
7976 			goto done;
7977 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7978 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7979 		if (err)
7980 			goto done;
7981 		err = add_color(&s->colors, "/$",
7982 		    TOG_COLOR_TREE_DIRECTORY,
7983 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7984 		if (err)
7985 			goto done;
7986 
7987 		err = add_color(&s->colors, "\\*$",
7988 		    TOG_COLOR_TREE_EXECUTABLE,
7989 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7990 		if (err)
7991 			goto done;
7992 
7993 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7994 		    get_color_value("TOG_COLOR_COMMIT"));
7995 		if (err)
7996 			goto done;
7997 	}
7998 
7999 	view->show = show_tree_view;
8000 	view->input = input_tree_view;
8001 	view->close = close_tree_view;
8002 	view->search_start = search_start_tree_view;
8003 	view->search_next = search_next_tree_view;
8004 done:
8005 	free(commit_id_str);
8006 	if (commit)
8007 		got_object_commit_close(commit);
8008 	if (err) {
8009 		if (view->close == NULL)
8010 			close_tree_view(view);
8011 		view_close(view);
8012 	}
8013 	return err;
8014 }
8015 
8016 static const struct got_error *
8017 close_tree_view(struct tog_view *view)
8018 {
8019 	struct tog_tree_view_state *s = &view->state.tree;
8020 
8021 	free_colors(&s->colors);
8022 	free(s->tree_label);
8023 	s->tree_label = NULL;
8024 	free(s->commit_id);
8025 	s->commit_id = NULL;
8026 	free(s->head_ref_name);
8027 	s->head_ref_name = NULL;
8028 	while (!TAILQ_EMPTY(&s->parents)) {
8029 		struct tog_parent_tree *parent;
8030 		parent = TAILQ_FIRST(&s->parents);
8031 		TAILQ_REMOVE(&s->parents, parent, entry);
8032 		if (parent->tree != s->root)
8033 			got_object_tree_close(parent->tree);
8034 		free(parent);
8035 
8036 	}
8037 	if (s->tree != NULL && s->tree != s->root)
8038 		got_object_tree_close(s->tree);
8039 	if (s->root)
8040 		got_object_tree_close(s->root);
8041 	return NULL;
8042 }
8043 
8044 static const struct got_error *
8045 search_start_tree_view(struct tog_view *view)
8046 {
8047 	struct tog_tree_view_state *s = &view->state.tree;
8048 
8049 	s->matched_entry = NULL;
8050 	return NULL;
8051 }
8052 
8053 static int
8054 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
8055 {
8056 	regmatch_t regmatch;
8057 
8058 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
8059 	    0) == 0;
8060 }
8061 
8062 static const struct got_error *
8063 search_next_tree_view(struct tog_view *view)
8064 {
8065 	struct tog_tree_view_state *s = &view->state.tree;
8066 	struct got_tree_entry *te = NULL;
8067 
8068 	if (!view->searching) {
8069 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8070 		return NULL;
8071 	}
8072 
8073 	if (s->matched_entry) {
8074 		if (view->searching == TOG_SEARCH_FORWARD) {
8075 			if (s->selected_entry)
8076 				te = got_tree_entry_get_next(s->tree,
8077 				    s->selected_entry);
8078 			else
8079 				te = got_object_tree_get_first_entry(s->tr