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