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