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