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