1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 	pthread_cond_t blame_complete;
436 };
437 
438 struct tog_blame {
439 	FILE *f;
440 	off_t filesize;
441 	struct tog_blame_line *lines;
442 	int nlines;
443 	off_t *line_offsets;
444 	pthread_t thread;
445 	struct tog_blame_thread_args thread_args;
446 	struct tog_blame_cb_args cb_args;
447 	const char *path;
448 	int *pack_fds;
449 };
450 
451 struct tog_blame_view_state {
452 	int first_displayed_line;
453 	int last_displayed_line;
454 	int selected_line;
455 	int last_diffed_line;
456 	int blame_complete;
457 	int eof;
458 	int done;
459 	struct got_object_id_queue blamed_commits;
460 	struct got_object_qid *blamed_commit;
461 	char *path;
462 	struct got_repository *repo;
463 	struct got_object_id *commit_id;
464 	struct got_object_id *id_to_log;
465 	struct tog_blame blame;
466 	int matched_line;
467 	struct tog_colors colors;
468 };
469 
470 struct tog_parent_tree {
471 	TAILQ_ENTRY(tog_parent_tree) entry;
472 	struct got_tree_object *tree;
473 	struct got_tree_entry *first_displayed_entry;
474 	struct got_tree_entry *selected_entry;
475 	int selected;
476 };
477 
478 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
479 
480 struct tog_tree_view_state {
481 	char *tree_label;
482 	struct got_object_id *commit_id;/* commit which this tree belongs to */
483 	struct got_tree_object *root;	/* the commit's root tree entry */
484 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
485 	struct got_tree_entry *first_displayed_entry;
486 	struct got_tree_entry *last_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int ndisplayed, selected, show_ids;
489 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
490 	char *head_ref_name;
491 	struct got_repository *repo;
492 	struct got_tree_entry *matched_entry;
493 	struct tog_colors colors;
494 };
495 
496 struct tog_reflist_entry {
497 	TAILQ_ENTRY(tog_reflist_entry) entry;
498 	struct got_reference *ref;
499 	int idx;
500 };
501 
502 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
503 
504 struct tog_ref_view_state {
505 	struct tog_reflist_head refs;
506 	struct tog_reflist_entry *first_displayed_entry;
507 	struct tog_reflist_entry *last_displayed_entry;
508 	struct tog_reflist_entry *selected_entry;
509 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
510 	struct got_repository *repo;
511 	struct tog_reflist_entry *matched_entry;
512 	struct tog_colors colors;
513 };
514 
515 struct tog_help_view_state {
516 	FILE			*f;
517 	off_t			*line_offsets;
518 	size_t			 nlines;
519 	int			 lineno;
520 	int			 first_displayed_line;
521 	int			 last_displayed_line;
522 	int			 eof;
523 	int			 matched_line;
524 	int			 selected_line;
525 	int			 all;
526 	enum tog_keymap_type	 type;
527 };
528 
529 #define GENERATE_HELP \
530 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
531 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
532 	KEY_("k C-p Up", "Move cursor or page up one line"), \
533 	KEY_("j C-n Down", "Move cursor or page down one line"), \
534 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
535 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
536 	KEY_("C-u u", "Scroll the view up one half page"), \
537 	KEY_("C-d d", "Scroll the view down one half page"), \
538 	KEY_("g", "Go to line N (default: first line)"), \
539 	KEY_("Home =", "Go to the first line"), \
540 	KEY_("G", "Go to line N (default: last line)"), \
541 	KEY_("End *", "Go to the last line"), \
542 	KEY_("l Right", "Scroll the view right"), \
543 	KEY_("h Left", "Scroll the view left"), \
544 	KEY_("$", "Scroll view to the rightmost position"), \
545 	KEY_("0", "Scroll view to the leftmost position"), \
546 	KEY_("-", "Decrease size of the focussed split"), \
547 	KEY_("+", "Increase size of the focussed split"), \
548 	KEY_("Tab", "Switch focus between views"), \
549 	KEY_("F", "Toggle fullscreen mode"), \
550 	KEY_("S", "Switch split-screen layout"), \
551 	KEY_("/", "Open prompt to enter search term"), \
552 	KEY_("n", "Find next line/token matching the current search term"), \
553 	KEY_("N", "Find previous line/token matching the current search term"),\
554 	KEY_("q", "Quit the focussed view; Quit help screen"), \
555 	KEY_("Q", "Quit tog"), \
556 	\
557 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
558 	KEY_("< ,", "Move cursor up one commit"), \
559 	KEY_("> .", "Move cursor down one commit"), \
560 	KEY_("Enter", "Open diff view of the selected commit"), \
561 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
562 	KEY_("R", "Open ref view of all repository references"), \
563 	KEY_("T", "Display tree view of the repository from the selected" \
564 	    " commit"), \
565 	KEY_("@", "Toggle between displaying author and committer name"), \
566 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
567 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
568 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
569 	\
570 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
571 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
572 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
573 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
574 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
575 	    " data"), \
576 	KEY_("(", "Go to the previous file in the diff"), \
577 	KEY_(")", "Go to the next file in the diff"), \
578 	KEY_("{", "Go to the previous hunk in the diff"), \
579 	KEY_("}", "Go to the next hunk in the diff"), \
580 	KEY_("[", "Decrease the number of context lines"), \
581 	KEY_("]", "Increase the number of context lines"), \
582 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
583 	\
584 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
585 	KEY_("Enter", "Display diff view of the selected line's commit"), \
586 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
587 	KEY_("L", "Open log view for the currently selected annotated line"), \
588 	KEY_("C", "Reload view with the previously blamed commit"), \
589 	KEY_("c", "Reload view with the version of the file found in the" \
590 	    " selected line's commit"), \
591 	KEY_("p", "Reload view with the version of the file found in the" \
592 	    " selected line's parent commit"), \
593 	\
594 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
595 	KEY_("Enter", "Enter selected directory or open blame view of the" \
596 	    " selected file"), \
597 	KEY_("L", "Open log view for the selected entry"), \
598 	KEY_("R", "Open ref view of all repository references"), \
599 	KEY_("i", "Show object IDs for all tree entries"), \
600 	KEY_("Backspace", "Return to the parent directory"), \
601 	\
602 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
603 	KEY_("Enter", "Display log view of the selected reference"), \
604 	KEY_("T", "Display tree view of the selected reference"), \
605 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
606 	KEY_("m", "Toggle display of last modified date for each reference"), \
607 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
608 	KEY_("C-l", "Reload view with all repository references")
609 
610 struct tog_key_map {
611 	const char		*keys;
612 	const char		*info;
613 	enum tog_keymap_type	 type;
614 };
615 
616 /* curses io for tog regress */
617 struct tog_io {
618 	FILE	*cin;
619 	FILE	*cout;
620 	FILE	*f;
621 	int	 wait_for_ui;
622 } tog_io;
623 static int using_mock_io;
624 
625 #define TOG_KEY_SCRDUMP	SHRT_MIN
626 
627 /*
628  * We implement two types of views: parent views and child views.
629  *
630  * The 'Tab' key switches focus between a parent view and its child view.
631  * Child views are shown side-by-side to their parent view, provided
632  * there is enough screen estate.
633  *
634  * When a new view is opened from within a parent view, this new view
635  * becomes a child view of the parent view, replacing any existing child.
636  *
637  * When a new view is opened from within a child view, this new view
638  * becomes a parent view which will obscure the views below until the
639  * user quits the new parent view by typing 'q'.
640  *
641  * This list of views contains parent views only.
642  * Child views are only pointed to by their parent view.
643  */
644 TAILQ_HEAD(tog_view_list_head, tog_view);
645 
646 struct tog_view {
647 	TAILQ_ENTRY(tog_view) entry;
648 	WINDOW *window;
649 	PANEL *panel;
650 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
651 	int resized_y, resized_x; /* begin_y/x based on user resizing */
652 	int maxx, x; /* max column and current start column */
653 	int lines, cols; /* copies of LINES and COLS */
654 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
655 	int gline, hiline; /* navigate to and highlight this nG line */
656 	int ch, count; /* current keymap and count prefix */
657 	int resized; /* set when in a resize event */
658 	int focussed; /* Only set on one parent or child view at a time. */
659 	int dying;
660 	struct tog_view *parent;
661 	struct tog_view *child;
662 
663 	/*
664 	 * This flag is initially set on parent views when a new child view
665 	 * is created. It gets toggled when the 'Tab' key switches focus
666 	 * between parent and child.
667 	 * The flag indicates whether focus should be passed on to our child
668 	 * view if this parent view gets picked for focus after another parent
669 	 * view was closed. This prevents child views from losing focus in such
670 	 * situations.
671 	 */
672 	int focus_child;
673 
674 	enum tog_view_mode mode;
675 	/* type-specific state */
676 	enum tog_view_type type;
677 	union {
678 		struct tog_diff_view_state diff;
679 		struct tog_log_view_state log;
680 		struct tog_blame_view_state blame;
681 		struct tog_tree_view_state tree;
682 		struct tog_ref_view_state ref;
683 		struct tog_help_view_state help;
684 	} state;
685 
686 	const struct got_error *(*show)(struct tog_view *);
687 	const struct got_error *(*input)(struct tog_view **,
688 	    struct tog_view *, int);
689 	const struct got_error *(*reset)(struct tog_view *);
690 	const struct got_error *(*resize)(struct tog_view *, int);
691 	const struct got_error *(*close)(struct tog_view *);
692 
693 	const struct got_error *(*search_start)(struct tog_view *);
694 	const struct got_error *(*search_next)(struct tog_view *);
695 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
696 	    int **, int **, int **, int **);
697 	int search_started;
698 	int searching;
699 #define TOG_SEARCH_FORWARD	1
700 #define TOG_SEARCH_BACKWARD	2
701 	int search_next_done;
702 #define TOG_SEARCH_HAVE_MORE	1
703 #define TOG_SEARCH_NO_MORE	2
704 #define TOG_SEARCH_HAVE_NONE	3
705 	regex_t regex;
706 	regmatch_t regmatch;
707 	const char *action;
708 };
709 
710 static const struct got_error *open_diff_view(struct tog_view *,
711     struct got_object_id *, struct got_object_id *,
712     const char *, const char *, int, int, int, struct tog_view *,
713     struct got_repository *);
714 static const struct got_error *show_diff_view(struct tog_view *);
715 static const struct got_error *input_diff_view(struct tog_view **,
716     struct tog_view *, int);
717 static const struct got_error *reset_diff_view(struct tog_view *);
718 static const struct got_error* close_diff_view(struct tog_view *);
719 static const struct got_error *search_start_diff_view(struct tog_view *);
720 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
721     size_t *, int **, int **, int **, int **);
722 static const struct got_error *search_next_view_match(struct tog_view *);
723 
724 static const struct got_error *open_log_view(struct tog_view *,
725     struct got_object_id *, struct got_repository *,
726     const char *, const char *, int);
727 static const struct got_error * show_log_view(struct tog_view *);
728 static const struct got_error *input_log_view(struct tog_view **,
729     struct tog_view *, int);
730 static const struct got_error *resize_log_view(struct tog_view *, int);
731 static const struct got_error *close_log_view(struct tog_view *);
732 static const struct got_error *search_start_log_view(struct tog_view *);
733 static const struct got_error *search_next_log_view(struct tog_view *);
734 
735 static const struct got_error *open_blame_view(struct tog_view *, char *,
736     struct got_object_id *, struct got_repository *);
737 static const struct got_error *show_blame_view(struct tog_view *);
738 static const struct got_error *input_blame_view(struct tog_view **,
739     struct tog_view *, int);
740 static const struct got_error *reset_blame_view(struct tog_view *);
741 static const struct got_error *close_blame_view(struct tog_view *);
742 static const struct got_error *search_start_blame_view(struct tog_view *);
743 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
744     size_t *, int **, int **, int **, int **);
745 
746 static const struct got_error *open_tree_view(struct tog_view *,
747     struct got_object_id *, const char *, struct got_repository *);
748 static const struct got_error *show_tree_view(struct tog_view *);
749 static const struct got_error *input_tree_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *close_tree_view(struct tog_view *);
752 static const struct got_error *search_start_tree_view(struct tog_view *);
753 static const struct got_error *search_next_tree_view(struct tog_view *);
754 
755 static const struct got_error *open_ref_view(struct tog_view *,
756     struct got_repository *);
757 static const struct got_error *show_ref_view(struct tog_view *);
758 static const struct got_error *input_ref_view(struct tog_view **,
759     struct tog_view *, int);
760 static const struct got_error *close_ref_view(struct tog_view *);
761 static const struct got_error *search_start_ref_view(struct tog_view *);
762 static const struct got_error *search_next_ref_view(struct tog_view *);
763 
764 static const struct got_error *open_help_view(struct tog_view *,
765     struct tog_view *);
766 static const struct got_error *show_help_view(struct tog_view *);
767 static const struct got_error *input_help_view(struct tog_view **,
768     struct tog_view *, int);
769 static const struct got_error *reset_help_view(struct tog_view *);
770 static const struct got_error* close_help_view(struct tog_view *);
771 static const struct got_error *search_start_help_view(struct tog_view *);
772 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
773     size_t *, int **, int **, int **, int **);
774 
775 static volatile sig_atomic_t tog_sigwinch_received;
776 static volatile sig_atomic_t tog_sigpipe_received;
777 static volatile sig_atomic_t tog_sigcont_received;
778 static volatile sig_atomic_t tog_sigint_received;
779 static volatile sig_atomic_t tog_sigterm_received;
780 
781 static void
782 tog_sigwinch(int signo)
783 {
784 	tog_sigwinch_received = 1;
785 }
786 
787 static void
788 tog_sigpipe(int signo)
789 {
790 	tog_sigpipe_received = 1;
791 }
792 
793 static void
794 tog_sigcont(int signo)
795 {
796 	tog_sigcont_received = 1;
797 }
798 
799 static void
800 tog_sigint(int signo)
801 {
802 	tog_sigint_received = 1;
803 }
804 
805 static void
806 tog_sigterm(int signo)
807 {
808 	tog_sigterm_received = 1;
809 }
810 
811 static int
812 tog_fatal_signal_received(void)
813 {
814 	return (tog_sigpipe_received ||
815 	    tog_sigint_received || tog_sigterm_received);
816 }
817 
818 static const struct got_error *
819 view_close(struct tog_view *view)
820 {
821 	const struct got_error *err = NULL, *child_err = NULL;
822 
823 	if (view->child) {
824 		child_err = view_close(view->child);
825 		view->child = NULL;
826 	}
827 	if (view->close)
828 		err = view->close(view);
829 	if (view->panel)
830 		del_panel(view->panel);
831 	if (view->window)
832 		delwin(view->window);
833 	free(view);
834 	return err ? err : child_err;
835 }
836 
837 static struct tog_view *
838 view_open(int nlines, int ncols, int begin_y, int begin_x,
839     enum tog_view_type type)
840 {
841 	struct tog_view *view = calloc(1, sizeof(*view));
842 
843 	if (view == NULL)
844 		return NULL;
845 
846 	view->type = type;
847 	view->lines = LINES;
848 	view->cols = COLS;
849 	view->nlines = nlines ? nlines : LINES - begin_y;
850 	view->ncols = ncols ? ncols : COLS - begin_x;
851 	view->begin_y = begin_y;
852 	view->begin_x = begin_x;
853 	view->window = newwin(nlines, ncols, begin_y, begin_x);
854 	if (view->window == NULL) {
855 		view_close(view);
856 		return NULL;
857 	}
858 	view->panel = new_panel(view->window);
859 	if (view->panel == NULL ||
860 	    set_panel_userptr(view->panel, view) != OK) {
861 		view_close(view);
862 		return NULL;
863 	}
864 
865 	keypad(view->window, TRUE);
866 	return view;
867 }
868 
869 static int
870 view_split_begin_x(int begin_x)
871 {
872 	if (begin_x > 0 || COLS < 120)
873 		return 0;
874 	return (COLS - MAX(COLS / 2, 80));
875 }
876 
877 /* XXX Stub till we decide what to do. */
878 static int
879 view_split_begin_y(int lines)
880 {
881 	return lines * HSPLIT_SCALE;
882 }
883 
884 static const struct got_error *view_resize(struct tog_view *);
885 
886 static const struct got_error *
887 view_splitscreen(struct tog_view *view)
888 {
889 	const struct got_error *err = NULL;
890 
891 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
892 		if (view->resized_y && view->resized_y < view->lines)
893 			view->begin_y = view->resized_y;
894 		else
895 			view->begin_y = view_split_begin_y(view->nlines);
896 		view->begin_x = 0;
897 	} else if (!view->resized) {
898 		if (view->resized_x && view->resized_x < view->cols - 1 &&
899 		    view->cols > 119)
900 			view->begin_x = view->resized_x;
901 		else
902 			view->begin_x = view_split_begin_x(0);
903 		view->begin_y = 0;
904 	}
905 	view->nlines = LINES - view->begin_y;
906 	view->ncols = COLS - view->begin_x;
907 	view->lines = LINES;
908 	view->cols = COLS;
909 	err = view_resize(view);
910 	if (err)
911 		return err;
912 
913 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
914 		view->parent->nlines = view->begin_y;
915 
916 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
917 		return got_error_from_errno("mvwin");
918 
919 	return NULL;
920 }
921 
922 static const struct got_error *
923 view_fullscreen(struct tog_view *view)
924 {
925 	const struct got_error *err = NULL;
926 
927 	view->begin_x = 0;
928 	view->begin_y = view->resized ? view->begin_y : 0;
929 	view->nlines = view->resized ? view->nlines : LINES;
930 	view->ncols = COLS;
931 	view->lines = LINES;
932 	view->cols = COLS;
933 	err = view_resize(view);
934 	if (err)
935 		return err;
936 
937 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
938 		return got_error_from_errno("mvwin");
939 
940 	return NULL;
941 }
942 
943 static int
944 view_is_parent_view(struct tog_view *view)
945 {
946 	return view->parent == NULL;
947 }
948 
949 static int
950 view_is_splitscreen(struct tog_view *view)
951 {
952 	return view->begin_x > 0 || view->begin_y > 0;
953 }
954 
955 static int
956 view_is_fullscreen(struct tog_view *view)
957 {
958 	return view->nlines == LINES && view->ncols == COLS;
959 }
960 
961 static int
962 view_is_hsplit_top(struct tog_view *view)
963 {
964 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
965 	    view_is_splitscreen(view->child);
966 }
967 
968 static void
969 view_border(struct tog_view *view)
970 {
971 	PANEL *panel;
972 	const struct tog_view *view_above;
973 
974 	if (view->parent)
975 		return view_border(view->parent);
976 
977 	panel = panel_above(view->panel);
978 	if (panel == NULL)
979 		return;
980 
981 	view_above = panel_userptr(panel);
982 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
983 		mvwhline(view->window, view_above->begin_y - 1,
984 		    view->begin_x, ACS_HLINE, view->ncols);
985 	else
986 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
987 		    ACS_VLINE, view->nlines);
988 }
989 
990 static const struct got_error *view_init_hsplit(struct tog_view *, int);
991 static const struct got_error *request_log_commits(struct tog_view *);
992 static const struct got_error *offset_selection_down(struct tog_view *);
993 static void offset_selection_up(struct tog_view *);
994 static void view_get_split(struct tog_view *, int *, int *);
995 
996 static const struct got_error *
997 view_resize(struct tog_view *view)
998 {
999 	const struct got_error	*err = NULL;
1000 	int			 dif, nlines, ncols;
1001 
1002 	dif = LINES - view->lines;  /* line difference */
1003 
1004 	if (view->lines > LINES)
1005 		nlines = view->nlines - (view->lines - LINES);
1006 	else
1007 		nlines = view->nlines + (LINES - view->lines);
1008 	if (view->cols > COLS)
1009 		ncols = view->ncols - (view->cols - COLS);
1010 	else
1011 		ncols = view->ncols + (COLS - view->cols);
1012 
1013 	if (view->child) {
1014 		int hs = view->child->begin_y;
1015 
1016 		if (!view_is_fullscreen(view))
1017 			view->child->begin_x = view_split_begin_x(view->begin_x);
1018 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1019 		    view->child->begin_x == 0) {
1020 			ncols = COLS;
1021 
1022 			view_fullscreen(view->child);
1023 			if (view->child->focussed)
1024 				show_panel(view->child->panel);
1025 			else
1026 				show_panel(view->panel);
1027 		} else {
1028 			ncols = view->child->begin_x;
1029 
1030 			view_splitscreen(view->child);
1031 			show_panel(view->child->panel);
1032 		}
1033 		/*
1034 		 * XXX This is ugly and needs to be moved into the above
1035 		 * logic but "works" for now and my attempts at moving it
1036 		 * break either 'tab' or 'F' key maps in horizontal splits.
1037 		 */
1038 		if (hs) {
1039 			err = view_splitscreen(view->child);
1040 			if (err)
1041 				return err;
1042 			if (dif < 0) { /* top split decreased */
1043 				err = offset_selection_down(view);
1044 				if (err)
1045 					return err;
1046 			}
1047 			view_border(view);
1048 			update_panels();
1049 			doupdate();
1050 			show_panel(view->child->panel);
1051 			nlines = view->nlines;
1052 		}
1053 	} else if (view->parent == NULL)
1054 		ncols = COLS;
1055 
1056 	if (view->resize && dif > 0) {
1057 		err = view->resize(view, dif);
1058 		if (err)
1059 			return err;
1060 	}
1061 
1062 	if (wresize(view->window, nlines, ncols) == ERR)
1063 		return got_error_from_errno("wresize");
1064 	if (replace_panel(view->panel, view->window) == ERR)
1065 		return got_error_from_errno("replace_panel");
1066 	wclear(view->window);
1067 
1068 	view->nlines = nlines;
1069 	view->ncols = ncols;
1070 	view->lines = LINES;
1071 	view->cols = COLS;
1072 
1073 	return NULL;
1074 }
1075 
1076 static const struct got_error *
1077 resize_log_view(struct tog_view *view, int increase)
1078 {
1079 	struct tog_log_view_state	*s = &view->state.log;
1080 	const struct got_error		*err = NULL;
1081 	int				 n = 0;
1082 
1083 	if (s->selected_entry)
1084 		n = s->selected_entry->idx + view->lines - s->selected;
1085 
1086 	/*
1087 	 * Request commits to account for the increased
1088 	 * height so we have enough to populate the view.
1089 	 */
1090 	if (s->commits->ncommits < n) {
1091 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1092 		err = request_log_commits(view);
1093 	}
1094 
1095 	return err;
1096 }
1097 
1098 static void
1099 view_adjust_offset(struct tog_view *view, int n)
1100 {
1101 	if (n == 0)
1102 		return;
1103 
1104 	if (view->parent && view->parent->offset) {
1105 		if (view->parent->offset + n >= 0)
1106 			view->parent->offset += n;
1107 		else
1108 			view->parent->offset = 0;
1109 	} else if (view->offset) {
1110 		if (view->offset - n >= 0)
1111 			view->offset -= n;
1112 		else
1113 			view->offset = 0;
1114 	}
1115 }
1116 
1117 static const struct got_error *
1118 view_resize_split(struct tog_view *view, int resize)
1119 {
1120 	const struct got_error	*err = NULL;
1121 	struct tog_view		*v = NULL;
1122 
1123 	if (view->parent)
1124 		v = view->parent;
1125 	else
1126 		v = view;
1127 
1128 	if (!v->child || !view_is_splitscreen(v->child))
1129 		return NULL;
1130 
1131 	v->resized = v->child->resized = resize;  /* lock for resize event */
1132 
1133 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1134 		if (v->child->resized_y)
1135 			v->child->begin_y = v->child->resized_y;
1136 		if (view->parent)
1137 			v->child->begin_y -= resize;
1138 		else
1139 			v->child->begin_y += resize;
1140 		if (v->child->begin_y < 3) {
1141 			view->count = 0;
1142 			v->child->begin_y = 3;
1143 		} else if (v->child->begin_y > LINES - 1) {
1144 			view->count = 0;
1145 			v->child->begin_y = LINES - 1;
1146 		}
1147 		v->ncols = COLS;
1148 		v->child->ncols = COLS;
1149 		view_adjust_offset(view, resize);
1150 		err = view_init_hsplit(v, v->child->begin_y);
1151 		if (err)
1152 			return err;
1153 		v->child->resized_y = v->child->begin_y;
1154 	} else {
1155 		if (v->child->resized_x)
1156 			v->child->begin_x = v->child->resized_x;
1157 		if (view->parent)
1158 			v->child->begin_x -= resize;
1159 		else
1160 			v->child->begin_x += resize;
1161 		if (v->child->begin_x < 11) {
1162 			view->count = 0;
1163 			v->child->begin_x = 11;
1164 		} else if (v->child->begin_x > COLS - 1) {
1165 			view->count = 0;
1166 			v->child->begin_x = COLS - 1;
1167 		}
1168 		v->child->resized_x = v->child->begin_x;
1169 	}
1170 
1171 	v->child->mode = v->mode;
1172 	v->child->nlines = v->lines - v->child->begin_y;
1173 	v->child->ncols = v->cols - v->child->begin_x;
1174 	v->focus_child = 1;
1175 
1176 	err = view_fullscreen(v);
1177 	if (err)
1178 		return err;
1179 	err = view_splitscreen(v->child);
1180 	if (err)
1181 		return err;
1182 
1183 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1184 		err = offset_selection_down(v->child);
1185 		if (err)
1186 			return err;
1187 	}
1188 
1189 	if (v->resize)
1190 		err = v->resize(v, 0);
1191 	else if (v->child->resize)
1192 		err = v->child->resize(v->child, 0);
1193 
1194 	v->resized = v->child->resized = 0;
1195 
1196 	return err;
1197 }
1198 
1199 static void
1200 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1201 {
1202 	struct tog_view *v = src->child ? src->child : src;
1203 
1204 	dst->resized_x = v->resized_x;
1205 	dst->resized_y = v->resized_y;
1206 }
1207 
1208 static const struct got_error *
1209 view_close_child(struct tog_view *view)
1210 {
1211 	const struct got_error *err = NULL;
1212 
1213 	if (view->child == NULL)
1214 		return NULL;
1215 
1216 	err = view_close(view->child);
1217 	view->child = NULL;
1218 	return err;
1219 }
1220 
1221 static const struct got_error *
1222 view_set_child(struct tog_view *view, struct tog_view *child)
1223 {
1224 	const struct got_error *err = NULL;
1225 
1226 	view->child = child;
1227 	child->parent = view;
1228 
1229 	err = view_resize(view);
1230 	if (err)
1231 		return err;
1232 
1233 	if (view->child->resized_x || view->child->resized_y)
1234 		err = view_resize_split(view, 0);
1235 
1236 	return err;
1237 }
1238 
1239 static const struct got_error *view_dispatch_request(struct tog_view **,
1240     struct tog_view *, enum tog_view_type, int, int);
1241 
1242 static const struct got_error *
1243 view_request_new(struct tog_view **requested, struct tog_view *view,
1244     enum tog_view_type request)
1245 {
1246 	struct tog_view		*new_view = NULL;
1247 	const struct got_error	*err;
1248 	int			 y = 0, x = 0;
1249 
1250 	*requested = NULL;
1251 
1252 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1253 		view_get_split(view, &y, &x);
1254 
1255 	err = view_dispatch_request(&new_view, view, request, y, x);
1256 	if (err)
1257 		return err;
1258 
1259 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1260 	    request != TOG_VIEW_HELP) {
1261 		err = view_init_hsplit(view, y);
1262 		if (err)
1263 			return err;
1264 	}
1265 
1266 	view->focussed = 0;
1267 	new_view->focussed = 1;
1268 	new_view->mode = view->mode;
1269 	new_view->nlines = request == TOG_VIEW_HELP ?
1270 	    view->lines : view->lines - y;
1271 
1272 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1273 		view_transfer_size(new_view, view);
1274 		err = view_close_child(view);
1275 		if (err)
1276 			return err;
1277 		err = view_set_child(view, new_view);
1278 		if (err)
1279 			return err;
1280 		view->focus_child = 1;
1281 	} else
1282 		*requested = new_view;
1283 
1284 	return NULL;
1285 }
1286 
1287 static void
1288 tog_resizeterm(void)
1289 {
1290 	int cols, lines;
1291 	struct winsize size;
1292 
1293 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1294 		cols = 80;     /* Default */
1295 		lines = 24;
1296 	} else {
1297 		cols = size.ws_col;
1298 		lines = size.ws_row;
1299 	}
1300 	resize_term(lines, cols);
1301 }
1302 
1303 static const struct got_error *
1304 view_search_start(struct tog_view *view, int fast_refresh)
1305 {
1306 	const struct got_error *err = NULL;
1307 	struct tog_view *v = view;
1308 	char pattern[1024];
1309 	int ret;
1310 
1311 	if (view->search_started) {
1312 		regfree(&view->regex);
1313 		view->searching = 0;
1314 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1315 	}
1316 	view->search_started = 0;
1317 
1318 	if (view->nlines < 1)
1319 		return NULL;
1320 
1321 	if (view_is_hsplit_top(view))
1322 		v = view->child;
1323 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1324 		v = view->parent;
1325 
1326 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1327 	wclrtoeol(v->window);
1328 
1329 	nodelay(v->window, FALSE);  /* block for search term input */
1330 	nocbreak();
1331 	echo();
1332 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1333 	wrefresh(v->window);
1334 	cbreak();
1335 	noecho();
1336 	nodelay(v->window, TRUE);
1337 	if (!fast_refresh && !using_mock_io)
1338 		halfdelay(10);
1339 	if (ret == ERR)
1340 		return NULL;
1341 
1342 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1343 		err = view->search_start(view);
1344 		if (err) {
1345 			regfree(&view->regex);
1346 			return err;
1347 		}
1348 		view->search_started = 1;
1349 		view->searching = TOG_SEARCH_FORWARD;
1350 		view->search_next_done = 0;
1351 		view->search_next(view);
1352 	}
1353 
1354 	return NULL;
1355 }
1356 
1357 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1358 static const struct got_error *
1359 switch_split(struct tog_view *view)
1360 {
1361 	const struct got_error	*err = NULL;
1362 	struct tog_view		*v = NULL;
1363 
1364 	if (view->parent)
1365 		v = view->parent;
1366 	else
1367 		v = view;
1368 
1369 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1370 		v->mode = TOG_VIEW_SPLIT_VERT;
1371 	else
1372 		v->mode = TOG_VIEW_SPLIT_HRZN;
1373 
1374 	if (!v->child)
1375 		return NULL;
1376 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1377 		v->mode = TOG_VIEW_SPLIT_NONE;
1378 
1379 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1380 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1381 		v->child->begin_y = v->child->resized_y;
1382 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1383 		v->child->begin_x = v->child->resized_x;
1384 
1385 
1386 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1387 		v->ncols = COLS;
1388 		v->child->ncols = COLS;
1389 		v->child->nscrolled = LINES - v->child->nlines;
1390 
1391 		err = view_init_hsplit(v, v->child->begin_y);
1392 		if (err)
1393 			return err;
1394 	}
1395 	v->child->mode = v->mode;
1396 	v->child->nlines = v->lines - v->child->begin_y;
1397 	v->focus_child = 1;
1398 
1399 	err = view_fullscreen(v);
1400 	if (err)
1401 		return err;
1402 	err = view_splitscreen(v->child);
1403 	if (err)
1404 		return err;
1405 
1406 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1407 		v->mode = TOG_VIEW_SPLIT_VERT;
1408 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1409 		err = offset_selection_down(v);
1410 		if (err)
1411 			return err;
1412 		err = offset_selection_down(v->child);
1413 		if (err)
1414 			return err;
1415 	} else {
1416 		offset_selection_up(v);
1417 		offset_selection_up(v->child);
1418 	}
1419 	if (v->resize)
1420 		err = v->resize(v, 0);
1421 	else if (v->child->resize)
1422 		err = v->child->resize(v->child, 0);
1423 
1424 	return err;
1425 }
1426 
1427 /*
1428  * Strip trailing whitespace from str starting at byte *n;
1429  * if *n < 0, use strlen(str). Return new str length in *n.
1430  */
1431 static void
1432 strip_trailing_ws(char *str, int *n)
1433 {
1434 	size_t x = *n;
1435 
1436 	if (str == NULL || *str == '\0')
1437 		return;
1438 
1439 	if (x < 0)
1440 		x = strlen(str);
1441 
1442 	while (x-- > 0 && isspace((unsigned char)str[x]))
1443 		str[x] = '\0';
1444 
1445 	*n = x + 1;
1446 }
1447 
1448 /*
1449  * Extract visible substring of line y from the curses screen
1450  * and strip trailing whitespace. If vline is set, overwrite
1451  * line[vline] with '|' because the ACS_VLINE character is
1452  * written out as 'x'. Write the line to file f.
1453  */
1454 static const struct got_error *
1455 view_write_line(FILE *f, int y, int vline)
1456 {
1457 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1458 	int	r, w;
1459 
1460 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1461 	if (r == ERR)
1462 		return got_error_fmt(GOT_ERR_RANGE,
1463 		    "failed to extract line %d", y);
1464 
1465 	/*
1466 	 * In some views, lines are padded with blanks to COLS width.
1467 	 * Strip them so we can diff without the -b flag when testing.
1468 	 */
1469 	strip_trailing_ws(line, &r);
1470 
1471 	if (vline > 0)
1472 		line[vline] = '|';
1473 
1474 	w = fprintf(f, "%s\n", line);
1475 	if (w != r + 1)		/* \n */
1476 		return got_ferror(f, GOT_ERR_IO);
1477 
1478 	return NULL;
1479 }
1480 
1481 /*
1482  * Capture the visible curses screen by writing each line to the
1483  * file at the path set via the TOG_SCR_DUMP environment variable.
1484  */
1485 static const struct got_error *
1486 screendump(struct tog_view *view)
1487 {
1488 	const struct got_error	*err;
1489 	FILE			*f = NULL;
1490 	const char		*path;
1491 	int			 i;
1492 
1493 	path = getenv("TOG_SCR_DUMP");
1494 	if (path == NULL || *path == '\0')
1495 		return got_error_msg(GOT_ERR_BAD_PATH,
1496 		    "TOG_SCR_DUMP path not set to capture screen dump");
1497 	f = fopen(path, "wex");
1498 	if (f == NULL)
1499 		return got_error_from_errno_fmt("fopen: %s", path);
1500 
1501 	if ((view->child && view->child->begin_x) ||
1502 	    (view->parent && view->begin_x)) {
1503 		int ncols = view->child ? view->ncols : view->parent->ncols;
1504 
1505 		/* vertical splitscreen */
1506 		for (i = 0; i < view->nlines; ++i) {
1507 			err = view_write_line(f, i, ncols - 1);
1508 			if (err)
1509 				goto done;
1510 		}
1511 	} else {
1512 		int hline = 0;
1513 
1514 		/* fullscreen or horizontal splitscreen */
1515 		if ((view->child && view->child->begin_y) ||
1516 		    (view->parent && view->begin_y))	/* hsplit */
1517 			hline = view->child ?
1518 			    view->child->begin_y : view->begin_y;
1519 
1520 		for (i = 0; i < view->lines; i++) {
1521 			if (hline && i == hline - 1) {
1522 				int c;
1523 
1524 				/* ACS_HLINE writes out as 'q', overwrite it */
1525 				for (c = 0; c < view->cols; ++c)
1526 					fputc('-', f);
1527 				fputc('\n', f);
1528 				continue;
1529 			}
1530 
1531 			err = view_write_line(f, i, 0);
1532 			if (err)
1533 				goto done;
1534 		}
1535 	}
1536 
1537 done:
1538 	if (f && fclose(f) == EOF && err == NULL)
1539 		err = got_ferror(f, GOT_ERR_IO);
1540 	return err;
1541 }
1542 
1543 /*
1544  * Compute view->count from numeric input. Assign total to view->count and
1545  * return first non-numeric key entered.
1546  */
1547 static int
1548 get_compound_key(struct tog_view *view, int c)
1549 {
1550 	struct tog_view	*v = view;
1551 	int		 x, n = 0;
1552 
1553 	if (view_is_hsplit_top(view))
1554 		v = view->child;
1555 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1556 		v = view->parent;
1557 
1558 	view->count = 0;
1559 	cbreak();  /* block for input */
1560 	nodelay(view->window, FALSE);
1561 	wmove(v->window, v->nlines - 1, 0);
1562 	wclrtoeol(v->window);
1563 	waddch(v->window, ':');
1564 
1565 	do {
1566 		x = getcurx(v->window);
1567 		if (x != ERR && x < view->ncols) {
1568 			waddch(v->window, c);
1569 			wrefresh(v->window);
1570 		}
1571 
1572 		/*
1573 		 * Don't overflow. Max valid request should be the greatest
1574 		 * between the longest and total lines; cap at 10 million.
1575 		 */
1576 		if (n >= 9999999)
1577 			n = 9999999;
1578 		else
1579 			n = n * 10 + (c - '0');
1580 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1581 
1582 	if (c == 'G' || c == 'g') {	/* nG key map */
1583 		view->gline = view->hiline = n;
1584 		n = 0;
1585 		c = 0;
1586 	}
1587 
1588 	/* Massage excessive or inapplicable values at the input handler. */
1589 	view->count = n;
1590 
1591 	return c;
1592 }
1593 
1594 static void
1595 action_report(struct tog_view *view)
1596 {
1597 	struct tog_view *v = view;
1598 
1599 	if (view_is_hsplit_top(view))
1600 		v = view->child;
1601 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1602 		v = view->parent;
1603 
1604 	wmove(v->window, v->nlines - 1, 0);
1605 	wclrtoeol(v->window);
1606 	wprintw(v->window, ":%s", view->action);
1607 	wrefresh(v->window);
1608 
1609 	/*
1610 	 * Clear action status report. Only clear in blame view
1611 	 * once annotating is complete, otherwise it's too fast.
1612 	 */
1613 	if (view->type == TOG_VIEW_BLAME) {
1614 		if (view->state.blame.blame_complete)
1615 			view->action = NULL;
1616 	} else
1617 		view->action = NULL;
1618 }
1619 
1620 /*
1621  * Read the next line from the test script and assign
1622  * key instruction to *ch. If at EOF, set the *done flag.
1623  */
1624 static const struct got_error *
1625 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1626 {
1627 	const struct got_error	*err = NULL;
1628 	char			*line = NULL;
1629 	size_t			 linesz = 0;
1630 
1631 	if (view->count && --view->count) {
1632 		*ch = view->ch;
1633 		return NULL;
1634 	} else
1635 		*ch = -1;
1636 
1637 	if (getline(&line, &linesz, script) == -1) {
1638 		if (feof(script)) {
1639 			*done = 1;
1640 			goto done;
1641 		} else {
1642 			err = got_ferror(script, GOT_ERR_IO);
1643 			goto done;
1644 		}
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, "SCREENDUMP", 10) == 0)
1660 		*ch = TOG_KEY_SCRDUMP;
1661 	else if (isdigit((unsigned char)*line)) {
1662 		char *t = line;
1663 
1664 		while (isdigit((unsigned char)*t))
1665 			++t;
1666 		view->ch = *ch = *t;
1667 		*t = '\0';
1668 		/* ignore error, view->count is 0 if instruction is invalid */
1669 		view->count = strtonum(line, 0, INT_MAX, NULL);
1670 	} else
1671 		*ch = *line;
1672 
1673 done:
1674 	free(line);
1675 	return err;
1676 }
1677 
1678 static const struct got_error *
1679 view_input(struct tog_view **new, int *done, struct tog_view *view,
1680     struct tog_view_list_head *views, int fast_refresh)
1681 {
1682 	const struct got_error *err = NULL;
1683 	struct tog_view *v;
1684 	int ch, errcode;
1685 
1686 	*new = NULL;
1687 
1688 	if (view->action)
1689 		action_report(view);
1690 
1691 	/* Clear "no matches" indicator. */
1692 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1693 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1694 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1695 		view->count = 0;
1696 	}
1697 
1698 	if (view->searching && !view->search_next_done) {
1699 		errcode = pthread_mutex_unlock(&tog_mutex);
1700 		if (errcode)
1701 			return got_error_set_errno(errcode,
1702 			    "pthread_mutex_unlock");
1703 		sched_yield();
1704 		errcode = pthread_mutex_lock(&tog_mutex);
1705 		if (errcode)
1706 			return got_error_set_errno(errcode,
1707 			    "pthread_mutex_lock");
1708 		view->search_next(view);
1709 		return NULL;
1710 	}
1711 
1712 	/* Allow threads to make progress while we are waiting for input. */
1713 	errcode = pthread_mutex_unlock(&tog_mutex);
1714 	if (errcode)
1715 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1716 
1717 	if (using_mock_io) {
1718 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1719 		if (err) {
1720 			errcode = pthread_mutex_lock(&tog_mutex);
1721 			return err;
1722 		}
1723 	} else if (view->count && --view->count) {
1724 		cbreak();
1725 		nodelay(view->window, TRUE);
1726 		ch = wgetch(view->window);
1727 		/* let C-g or backspace abort unfinished count */
1728 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1729 			view->count = 0;
1730 		else
1731 			ch = view->ch;
1732 	} else {
1733 		ch = wgetch(view->window);
1734 		if (ch >= '1' && ch  <= '9')
1735 			view->ch = ch = get_compound_key(view, ch);
1736 	}
1737 	if (view->hiline && ch != ERR && ch != 0)
1738 		view->hiline = 0;  /* key pressed, clear line highlight */
1739 	nodelay(view->window, TRUE);
1740 	errcode = pthread_mutex_lock(&tog_mutex);
1741 	if (errcode)
1742 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1743 
1744 	if (tog_sigwinch_received || tog_sigcont_received) {
1745 		tog_resizeterm();
1746 		tog_sigwinch_received = 0;
1747 		tog_sigcont_received = 0;
1748 		TAILQ_FOREACH(v, views, entry) {
1749 			err = view_resize(v);
1750 			if (err)
1751 				return err;
1752 			err = v->input(new, v, KEY_RESIZE);
1753 			if (err)
1754 				return err;
1755 			if (v->child) {
1756 				err = view_resize(v->child);
1757 				if (err)
1758 					return err;
1759 				err = v->child->input(new, v->child,
1760 				    KEY_RESIZE);
1761 				if (err)
1762 					return err;
1763 				if (v->child->resized_x || v->child->resized_y) {
1764 					err = view_resize_split(v, 0);
1765 					if (err)
1766 						return err;
1767 				}
1768 			}
1769 		}
1770 	}
1771 
1772 	switch (ch) {
1773 	case '?':
1774 	case 'H':
1775 	case KEY_F(1):
1776 		if (view->type == TOG_VIEW_HELP)
1777 			err = view->reset(view);
1778 		else
1779 			err = view_request_new(new, view, TOG_VIEW_HELP);
1780 		break;
1781 	case '\t':
1782 		view->count = 0;
1783 		if (view->child) {
1784 			view->focussed = 0;
1785 			view->child->focussed = 1;
1786 			view->focus_child = 1;
1787 		} else if (view->parent) {
1788 			view->focussed = 0;
1789 			view->parent->focussed = 1;
1790 			view->parent->focus_child = 0;
1791 			if (!view_is_splitscreen(view)) {
1792 				if (view->parent->resize) {
1793 					err = view->parent->resize(view->parent,
1794 					    0);
1795 					if (err)
1796 						return err;
1797 				}
1798 				offset_selection_up(view->parent);
1799 				err = view_fullscreen(view->parent);
1800 				if (err)
1801 					return err;
1802 			}
1803 		}
1804 		break;
1805 	case 'q':
1806 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1807 			if (view->parent->resize) {
1808 				/* might need more commits to fill fullscreen */
1809 				err = view->parent->resize(view->parent, 0);
1810 				if (err)
1811 					break;
1812 			}
1813 			offset_selection_up(view->parent);
1814 		}
1815 		err = view->input(new, view, ch);
1816 		view->dying = 1;
1817 		break;
1818 	case 'Q':
1819 		*done = 1;
1820 		break;
1821 	case 'F':
1822 		view->count = 0;
1823 		if (view_is_parent_view(view)) {
1824 			if (view->child == NULL)
1825 				break;
1826 			if (view_is_splitscreen(view->child)) {
1827 				view->focussed = 0;
1828 				view->child->focussed = 1;
1829 				err = view_fullscreen(view->child);
1830 			} else {
1831 				err = view_splitscreen(view->child);
1832 				if (!err)
1833 					err = view_resize_split(view, 0);
1834 			}
1835 			if (err)
1836 				break;
1837 			err = view->child->input(new, view->child,
1838 			    KEY_RESIZE);
1839 		} else {
1840 			if (view_is_splitscreen(view)) {
1841 				view->parent->focussed = 0;
1842 				view->focussed = 1;
1843 				err = view_fullscreen(view);
1844 			} else {
1845 				err = view_splitscreen(view);
1846 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1847 					err = view_resize(view->parent);
1848 				if (!err)
1849 					err = view_resize_split(view, 0);
1850 			}
1851 			if (err)
1852 				break;
1853 			err = view->input(new, view, KEY_RESIZE);
1854 		}
1855 		if (err)
1856 			break;
1857 		if (view->resize) {
1858 			err = view->resize(view, 0);
1859 			if (err)
1860 				break;
1861 		}
1862 		if (view->parent)
1863 			err = offset_selection_down(view->parent);
1864 		if (!err)
1865 			err = offset_selection_down(view);
1866 		break;
1867 	case 'S':
1868 		view->count = 0;
1869 		err = switch_split(view);
1870 		break;
1871 	case '-':
1872 		err = view_resize_split(view, -1);
1873 		break;
1874 	case '+':
1875 		err = view_resize_split(view, 1);
1876 		break;
1877 	case KEY_RESIZE:
1878 		break;
1879 	case '/':
1880 		view->count = 0;
1881 		if (view->search_start)
1882 			view_search_start(view, fast_refresh);
1883 		else
1884 			err = view->input(new, view, ch);
1885 		break;
1886 	case 'N':
1887 	case 'n':
1888 		if (view->search_started && view->search_next) {
1889 			view->searching = (ch == 'n' ?
1890 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1891 			view->search_next_done = 0;
1892 			view->search_next(view);
1893 		} else
1894 			err = view->input(new, view, ch);
1895 		break;
1896 	case 'A':
1897 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1898 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1899 			view->action = "Patience diff algorithm";
1900 		} else {
1901 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1902 			view->action = "Myers diff algorithm";
1903 		}
1904 		TAILQ_FOREACH(v, views, entry) {
1905 			if (v->reset) {
1906 				err = v->reset(v);
1907 				if (err)
1908 					return err;
1909 			}
1910 			if (v->child && v->child->reset) {
1911 				err = v->child->reset(v->child);
1912 				if (err)
1913 					return err;
1914 			}
1915 		}
1916 		break;
1917 	case TOG_KEY_SCRDUMP:
1918 		err = screendump(view);
1919 		break;
1920 	default:
1921 		err = view->input(new, view, ch);
1922 		break;
1923 	}
1924 
1925 	return err;
1926 }
1927 
1928 static int
1929 view_needs_focus_indication(struct tog_view *view)
1930 {
1931 	if (view_is_parent_view(view)) {
1932 		if (view->child == NULL || view->child->focussed)
1933 			return 0;
1934 		if (!view_is_splitscreen(view->child))
1935 			return 0;
1936 	} else if (!view_is_splitscreen(view))
1937 		return 0;
1938 
1939 	return view->focussed;
1940 }
1941 
1942 static const struct got_error *
1943 tog_io_close(void)
1944 {
1945 	const struct got_error *err = NULL;
1946 
1947 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1948 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1949 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1950 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1951 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1952 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1953 
1954 	return err;
1955 }
1956 
1957 static const struct got_error *
1958 view_loop(struct tog_view *view)
1959 {
1960 	const struct got_error *err = NULL;
1961 	struct tog_view_list_head views;
1962 	struct tog_view *new_view;
1963 	char *mode;
1964 	int fast_refresh = 10;
1965 	int done = 0, errcode;
1966 
1967 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1968 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1969 		view->mode = TOG_VIEW_SPLIT_VERT;
1970 	else
1971 		view->mode = TOG_VIEW_SPLIT_HRZN;
1972 
1973 	errcode = pthread_mutex_lock(&tog_mutex);
1974 	if (errcode)
1975 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1976 
1977 	TAILQ_INIT(&views);
1978 	TAILQ_INSERT_HEAD(&views, view, entry);
1979 
1980 	view->focussed = 1;
1981 	err = view->show(view);
1982 	if (err)
1983 		return err;
1984 	update_panels();
1985 	doupdate();
1986 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1987 	    !tog_fatal_signal_received()) {
1988 		/* Refresh fast during initialization, then become slower. */
1989 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1990 			halfdelay(10); /* switch to once per second */
1991 
1992 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1993 		if (err)
1994 			break;
1995 
1996 		if (view->dying && view == TAILQ_FIRST(&views) &&
1997 		    TAILQ_NEXT(view, entry) == NULL)
1998 			done = 1;
1999 		if (done) {
2000 			struct tog_view *v;
2001 
2002 			/*
2003 			 * When we quit, scroll the screen up a single line
2004 			 * so we don't lose any information.
2005 			 */
2006 			TAILQ_FOREACH(v, &views, entry) {
2007 				wmove(v->window, 0, 0);
2008 				wdeleteln(v->window);
2009 				wnoutrefresh(v->window);
2010 				if (v->child && !view_is_fullscreen(v)) {
2011 					wmove(v->child->window, 0, 0);
2012 					wdeleteln(v->child->window);
2013 					wnoutrefresh(v->child->window);
2014 				}
2015 			}
2016 			doupdate();
2017 		}
2018 
2019 		if (view->dying) {
2020 			struct tog_view *v, *prev = NULL;
2021 
2022 			if (view_is_parent_view(view))
2023 				prev = TAILQ_PREV(view, tog_view_list_head,
2024 				    entry);
2025 			else if (view->parent)
2026 				prev = view->parent;
2027 
2028 			if (view->parent) {
2029 				view->parent->child = NULL;
2030 				view->parent->focus_child = 0;
2031 				/* Restore fullscreen line height. */
2032 				view->parent->nlines = view->parent->lines;
2033 				err = view_resize(view->parent);
2034 				if (err)
2035 					break;
2036 				/* Make resized splits persist. */
2037 				view_transfer_size(view->parent, view);
2038 			} else
2039 				TAILQ_REMOVE(&views, view, entry);
2040 
2041 			err = view_close(view);
2042 			if (err)
2043 				goto done;
2044 
2045 			view = NULL;
2046 			TAILQ_FOREACH(v, &views, entry) {
2047 				if (v->focussed)
2048 					break;
2049 			}
2050 			if (view == NULL && new_view == NULL) {
2051 				/* No view has focus. Try to pick one. */
2052 				if (prev)
2053 					view = prev;
2054 				else if (!TAILQ_EMPTY(&views)) {
2055 					view = TAILQ_LAST(&views,
2056 					    tog_view_list_head);
2057 				}
2058 				if (view) {
2059 					if (view->focus_child) {
2060 						view->child->focussed = 1;
2061 						view = view->child;
2062 					} else
2063 						view->focussed = 1;
2064 				}
2065 			}
2066 		}
2067 		if (new_view) {
2068 			struct tog_view *v, *t;
2069 			/* Only allow one parent view per type. */
2070 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2071 				if (v->type != new_view->type)
2072 					continue;
2073 				TAILQ_REMOVE(&views, v, entry);
2074 				err = view_close(v);
2075 				if (err)
2076 					goto done;
2077 				break;
2078 			}
2079 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2080 			view = new_view;
2081 		}
2082 		if (view && !done) {
2083 			if (view_is_parent_view(view)) {
2084 				if (view->child && view->child->focussed)
2085 					view = view->child;
2086 			} else {
2087 				if (view->parent && view->parent->focussed)
2088 					view = view->parent;
2089 			}
2090 			show_panel(view->panel);
2091 			if (view->child && view_is_splitscreen(view->child))
2092 				show_panel(view->child->panel);
2093 			if (view->parent && view_is_splitscreen(view)) {
2094 				err = view->parent->show(view->parent);
2095 				if (err)
2096 					goto done;
2097 			}
2098 			err = view->show(view);
2099 			if (err)
2100 				goto done;
2101 			if (view->child) {
2102 				err = view->child->show(view->child);
2103 				if (err)
2104 					goto done;
2105 			}
2106 			update_panels();
2107 			doupdate();
2108 		}
2109 	}
2110 done:
2111 	while (!TAILQ_EMPTY(&views)) {
2112 		const struct got_error *close_err;
2113 		view = TAILQ_FIRST(&views);
2114 		TAILQ_REMOVE(&views, view, entry);
2115 		close_err = view_close(view);
2116 		if (close_err && err == NULL)
2117 			err = close_err;
2118 	}
2119 
2120 	errcode = pthread_mutex_unlock(&tog_mutex);
2121 	if (errcode && err == NULL)
2122 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2123 
2124 	return err;
2125 }
2126 
2127 __dead static void
2128 usage_log(void)
2129 {
2130 	endwin();
2131 	fprintf(stderr,
2132 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2133 	    getprogname());
2134 	exit(1);
2135 }
2136 
2137 /* Create newly allocated wide-character string equivalent to a byte string. */
2138 static const struct got_error *
2139 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2140 {
2141 	char *vis = NULL;
2142 	const struct got_error *err = NULL;
2143 
2144 	*ws = NULL;
2145 	*wlen = mbstowcs(NULL, s, 0);
2146 	if (*wlen == (size_t)-1) {
2147 		int vislen;
2148 		if (errno != EILSEQ)
2149 			return got_error_from_errno("mbstowcs");
2150 
2151 		/* byte string invalid in current encoding; try to "fix" it */
2152 		err = got_mbsavis(&vis, &vislen, s);
2153 		if (err)
2154 			return err;
2155 		*wlen = mbstowcs(NULL, vis, 0);
2156 		if (*wlen == (size_t)-1) {
2157 			err = got_error_from_errno("mbstowcs"); /* give up */
2158 			goto done;
2159 		}
2160 	}
2161 
2162 	*ws = calloc(*wlen + 1, sizeof(**ws));
2163 	if (*ws == NULL) {
2164 		err = got_error_from_errno("calloc");
2165 		goto done;
2166 	}
2167 
2168 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2169 		err = got_error_from_errno("mbstowcs");
2170 done:
2171 	free(vis);
2172 	if (err) {
2173 		free(*ws);
2174 		*ws = NULL;
2175 		*wlen = 0;
2176 	}
2177 	return err;
2178 }
2179 
2180 static const struct got_error *
2181 expand_tab(char **ptr, const char *src)
2182 {
2183 	char	*dst;
2184 	size_t	 len, n, idx = 0, sz = 0;
2185 
2186 	*ptr = NULL;
2187 	n = len = strlen(src);
2188 	dst = malloc(n + 1);
2189 	if (dst == NULL)
2190 		return got_error_from_errno("malloc");
2191 
2192 	while (idx < len && src[idx]) {
2193 		const char c = src[idx];
2194 
2195 		if (c == '\t') {
2196 			size_t nb = TABSIZE - sz % TABSIZE;
2197 			char *p;
2198 
2199 			p = realloc(dst, n + nb);
2200 			if (p == NULL) {
2201 				free(dst);
2202 				return got_error_from_errno("realloc");
2203 
2204 			}
2205 			dst = p;
2206 			n += nb;
2207 			memset(dst + sz, ' ', nb);
2208 			sz += nb;
2209 		} else
2210 			dst[sz++] = src[idx];
2211 		++idx;
2212 	}
2213 
2214 	dst[sz] = '\0';
2215 	*ptr = dst;
2216 	return NULL;
2217 }
2218 
2219 /*
2220  * Advance at most n columns from wline starting at offset off.
2221  * Return the index to the first character after the span operation.
2222  * Return the combined column width of all spanned wide character in
2223  * *rcol.
2224  */
2225 static int
2226 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2227 {
2228 	int width, i, cols = 0;
2229 
2230 	if (n == 0) {
2231 		*rcol = cols;
2232 		return off;
2233 	}
2234 
2235 	for (i = off; wline[i] != L'\0'; ++i) {
2236 		if (wline[i] == L'\t')
2237 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2238 		else
2239 			width = wcwidth(wline[i]);
2240 
2241 		if (width == -1) {
2242 			width = 1;
2243 			wline[i] = L'.';
2244 		}
2245 
2246 		if (cols + width > n)
2247 			break;
2248 		cols += width;
2249 	}
2250 
2251 	*rcol = cols;
2252 	return i;
2253 }
2254 
2255 /*
2256  * Format a line for display, ensuring that it won't overflow a width limit.
2257  * With scrolling, the width returned refers to the scrolled version of the
2258  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2259  */
2260 static const struct got_error *
2261 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2262     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2263 {
2264 	const struct got_error *err = NULL;
2265 	int cols;
2266 	wchar_t *wline = NULL;
2267 	char *exstr = NULL;
2268 	size_t wlen;
2269 	int i, scrollx;
2270 
2271 	*wlinep = NULL;
2272 	*widthp = 0;
2273 
2274 	if (expand) {
2275 		err = expand_tab(&exstr, line);
2276 		if (err)
2277 			return err;
2278 	}
2279 
2280 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2281 	free(exstr);
2282 	if (err)
2283 		return err;
2284 
2285 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2286 
2287 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2288 		wline[wlen - 1] = L'\0';
2289 		wlen--;
2290 	}
2291 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2292 		wline[wlen - 1] = L'\0';
2293 		wlen--;
2294 	}
2295 
2296 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2297 	wline[i] = L'\0';
2298 
2299 	if (widthp)
2300 		*widthp = cols;
2301 	if (scrollxp)
2302 		*scrollxp = scrollx;
2303 	if (err)
2304 		free(wline);
2305 	else
2306 		*wlinep = wline;
2307 	return err;
2308 }
2309 
2310 static const struct got_error*
2311 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2312     struct got_object_id *id, struct got_repository *repo)
2313 {
2314 	static const struct got_error *err = NULL;
2315 	struct got_reflist_entry *re;
2316 	char *s;
2317 	const char *name;
2318 
2319 	*refs_str = NULL;
2320 
2321 	TAILQ_FOREACH(re, refs, entry) {
2322 		struct got_tag_object *tag = NULL;
2323 		struct got_object_id *ref_id;
2324 		int cmp;
2325 
2326 		name = got_ref_get_name(re->ref);
2327 		if (strcmp(name, GOT_REF_HEAD) == 0)
2328 			continue;
2329 		if (strncmp(name, "refs/", 5) == 0)
2330 			name += 5;
2331 		if (strncmp(name, "got/", 4) == 0 &&
2332 		    strncmp(name, "got/backup/", 11) != 0)
2333 			continue;
2334 		if (strncmp(name, "heads/", 6) == 0)
2335 			name += 6;
2336 		if (strncmp(name, "remotes/", 8) == 0) {
2337 			name += 8;
2338 			s = strstr(name, "/" GOT_REF_HEAD);
2339 			if (s != NULL && s[strlen(s)] == '\0')
2340 				continue;
2341 		}
2342 		err = got_ref_resolve(&ref_id, repo, re->ref);
2343 		if (err)
2344 			break;
2345 		if (strncmp(name, "tags/", 5) == 0) {
2346 			err = got_object_open_as_tag(&tag, repo, ref_id);
2347 			if (err) {
2348 				if (err->code != GOT_ERR_OBJ_TYPE) {
2349 					free(ref_id);
2350 					break;
2351 				}
2352 				/* Ref points at something other than a tag. */
2353 				err = NULL;
2354 				tag = NULL;
2355 			}
2356 		}
2357 		cmp = got_object_id_cmp(tag ?
2358 		    got_object_tag_get_object_id(tag) : ref_id, id);
2359 		free(ref_id);
2360 		if (tag)
2361 			got_object_tag_close(tag);
2362 		if (cmp != 0)
2363 			continue;
2364 		s = *refs_str;
2365 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2366 		    s ? ", " : "", name) == -1) {
2367 			err = got_error_from_errno("asprintf");
2368 			free(s);
2369 			*refs_str = NULL;
2370 			break;
2371 		}
2372 		free(s);
2373 	}
2374 
2375 	return err;
2376 }
2377 
2378 static const struct got_error *
2379 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2380     int col_tab_align)
2381 {
2382 	char *smallerthan;
2383 
2384 	smallerthan = strchr(author, '<');
2385 	if (smallerthan && smallerthan[1] != '\0')
2386 		author = smallerthan + 1;
2387 	author[strcspn(author, "@>")] = '\0';
2388 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2389 	    col_tab_align, 0);
2390 }
2391 
2392 static const struct got_error *
2393 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2394     struct got_object_id *id, const size_t date_display_cols,
2395     int author_display_cols)
2396 {
2397 	struct tog_log_view_state *s = &view->state.log;
2398 	const struct got_error *err = NULL;
2399 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2400 	char *logmsg0 = NULL, *logmsg = NULL;
2401 	char *author = NULL;
2402 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2403 	int author_width, logmsg_width;
2404 	char *newline, *line = NULL;
2405 	int col, limit, scrollx;
2406 	const int avail = view->ncols;
2407 	struct tm tm;
2408 	time_t committer_time;
2409 	struct tog_color *tc;
2410 
2411 	committer_time = got_object_commit_get_committer_time(commit);
2412 	if (gmtime_r(&committer_time, &tm) == NULL)
2413 		return got_error_from_errno("gmtime_r");
2414 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2415 		return got_error(GOT_ERR_NO_SPACE);
2416 
2417 	if (avail <= date_display_cols)
2418 		limit = MIN(sizeof(datebuf) - 1, avail);
2419 	else
2420 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2421 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2422 	if (tc)
2423 		wattr_on(view->window,
2424 		    COLOR_PAIR(tc->colorpair), NULL);
2425 	waddnstr(view->window, datebuf, limit);
2426 	if (tc)
2427 		wattr_off(view->window,
2428 		    COLOR_PAIR(tc->colorpair), NULL);
2429 	col = limit;
2430 	if (col > avail)
2431 		goto done;
2432 
2433 	if (avail >= 120) {
2434 		char *id_str;
2435 		err = got_object_id_str(&id_str, id);
2436 		if (err)
2437 			goto done;
2438 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2439 		if (tc)
2440 			wattr_on(view->window,
2441 			    COLOR_PAIR(tc->colorpair), NULL);
2442 		wprintw(view->window, "%.8s ", id_str);
2443 		if (tc)
2444 			wattr_off(view->window,
2445 			    COLOR_PAIR(tc->colorpair), NULL);
2446 		free(id_str);
2447 		col += 9;
2448 		if (col > avail)
2449 			goto done;
2450 	}
2451 
2452 	if (s->use_committer)
2453 		author = strdup(got_object_commit_get_committer(commit));
2454 	else
2455 		author = strdup(got_object_commit_get_author(commit));
2456 	if (author == NULL) {
2457 		err = got_error_from_errno("strdup");
2458 		goto done;
2459 	}
2460 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2461 	if (err)
2462 		goto done;
2463 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2464 	if (tc)
2465 		wattr_on(view->window,
2466 		    COLOR_PAIR(tc->colorpair), NULL);
2467 	waddwstr(view->window, wauthor);
2468 	col += author_width;
2469 	while (col < avail && author_width < author_display_cols + 2) {
2470 		waddch(view->window, ' ');
2471 		col++;
2472 		author_width++;
2473 	}
2474 	if (tc)
2475 		wattr_off(view->window,
2476 		    COLOR_PAIR(tc->colorpair), NULL);
2477 	if (col > avail)
2478 		goto done;
2479 
2480 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2481 	if (err)
2482 		goto done;
2483 	logmsg = logmsg0;
2484 	while (*logmsg == '\n')
2485 		logmsg++;
2486 	newline = strchr(logmsg, '\n');
2487 	if (newline)
2488 		*newline = '\0';
2489 	limit = avail - col;
2490 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2491 		limit--;	/* for the border */
2492 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2493 	    limit, col, 1);
2494 	if (err)
2495 		goto done;
2496 	waddwstr(view->window, &wlogmsg[scrollx]);
2497 	col += MAX(logmsg_width, 0);
2498 	while (col < avail) {
2499 		waddch(view->window, ' ');
2500 		col++;
2501 	}
2502 done:
2503 	free(logmsg0);
2504 	free(wlogmsg);
2505 	free(author);
2506 	free(wauthor);
2507 	free(line);
2508 	return err;
2509 }
2510 
2511 static struct commit_queue_entry *
2512 alloc_commit_queue_entry(struct got_commit_object *commit,
2513     struct got_object_id *id)
2514 {
2515 	struct commit_queue_entry *entry;
2516 	struct got_object_id *dup;
2517 
2518 	entry = calloc(1, sizeof(*entry));
2519 	if (entry == NULL)
2520 		return NULL;
2521 
2522 	dup = got_object_id_dup(id);
2523 	if (dup == NULL) {
2524 		free(entry);
2525 		return NULL;
2526 	}
2527 
2528 	entry->id = dup;
2529 	entry->commit = commit;
2530 	return entry;
2531 }
2532 
2533 static void
2534 pop_commit(struct commit_queue *commits)
2535 {
2536 	struct commit_queue_entry *entry;
2537 
2538 	entry = TAILQ_FIRST(&commits->head);
2539 	TAILQ_REMOVE(&commits->head, entry, entry);
2540 	got_object_commit_close(entry->commit);
2541 	commits->ncommits--;
2542 	free(entry->id);
2543 	free(entry);
2544 }
2545 
2546 static void
2547 free_commits(struct commit_queue *commits)
2548 {
2549 	while (!TAILQ_EMPTY(&commits->head))
2550 		pop_commit(commits);
2551 }
2552 
2553 static const struct got_error *
2554 match_commit(int *have_match, struct got_object_id *id,
2555     struct got_commit_object *commit, regex_t *regex)
2556 {
2557 	const struct got_error *err = NULL;
2558 	regmatch_t regmatch;
2559 	char *id_str = NULL, *logmsg = NULL;
2560 
2561 	*have_match = 0;
2562 
2563 	err = got_object_id_str(&id_str, id);
2564 	if (err)
2565 		return err;
2566 
2567 	err = got_object_commit_get_logmsg(&logmsg, commit);
2568 	if (err)
2569 		goto done;
2570 
2571 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2572 	    &regmatch, 0) == 0 ||
2573 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2574 	    &regmatch, 0) == 0 ||
2575 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2576 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2577 		*have_match = 1;
2578 done:
2579 	free(id_str);
2580 	free(logmsg);
2581 	return err;
2582 }
2583 
2584 static const struct got_error *
2585 queue_commits(struct tog_log_thread_args *a)
2586 {
2587 	const struct got_error *err = NULL;
2588 
2589 	/*
2590 	 * We keep all commits open throughout the lifetime of the log
2591 	 * view in order to avoid having to re-fetch commits from disk
2592 	 * while updating the display.
2593 	 */
2594 	do {
2595 		struct got_object_id id;
2596 		struct got_commit_object *commit;
2597 		struct commit_queue_entry *entry;
2598 		int limit_match = 0;
2599 		int errcode;
2600 
2601 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2602 		    NULL, NULL);
2603 		if (err)
2604 			break;
2605 
2606 		err = got_object_open_as_commit(&commit, a->repo, &id);
2607 		if (err)
2608 			break;
2609 		entry = alloc_commit_queue_entry(commit, &id);
2610 		if (entry == NULL) {
2611 			err = got_error_from_errno("alloc_commit_queue_entry");
2612 			break;
2613 		}
2614 
2615 		errcode = pthread_mutex_lock(&tog_mutex);
2616 		if (errcode) {
2617 			err = got_error_set_errno(errcode,
2618 			    "pthread_mutex_lock");
2619 			break;
2620 		}
2621 
2622 		entry->idx = a->real_commits->ncommits;
2623 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2624 		a->real_commits->ncommits++;
2625 
2626 		if (*a->limiting) {
2627 			err = match_commit(&limit_match, &id, commit,
2628 			    a->limit_regex);
2629 			if (err)
2630 				break;
2631 
2632 			if (limit_match) {
2633 				struct commit_queue_entry *matched;
2634 
2635 				matched = alloc_commit_queue_entry(
2636 				    entry->commit, entry->id);
2637 				if (matched == NULL) {
2638 					err = got_error_from_errno(
2639 					    "alloc_commit_queue_entry");
2640 					break;
2641 				}
2642 				matched->commit = entry->commit;
2643 				got_object_commit_retain(entry->commit);
2644 
2645 				matched->idx = a->limit_commits->ncommits;
2646 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2647 				    matched, entry);
2648 				a->limit_commits->ncommits++;
2649 			}
2650 
2651 			/*
2652 			 * This is how we signal log_thread() that we
2653 			 * have found a match, and that it should be
2654 			 * counted as a new entry for the view.
2655 			 */
2656 			a->limit_match = limit_match;
2657 		}
2658 
2659 		if (*a->searching == TOG_SEARCH_FORWARD &&
2660 		    !*a->search_next_done) {
2661 			int have_match;
2662 			err = match_commit(&have_match, &id, commit, a->regex);
2663 			if (err)
2664 				break;
2665 
2666 			if (*a->limiting) {
2667 				if (limit_match && have_match)
2668 					*a->search_next_done =
2669 					    TOG_SEARCH_HAVE_MORE;
2670 			} else if (have_match)
2671 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2672 		}
2673 
2674 		errcode = pthread_mutex_unlock(&tog_mutex);
2675 		if (errcode && err == NULL)
2676 			err = got_error_set_errno(errcode,
2677 			    "pthread_mutex_unlock");
2678 		if (err)
2679 			break;
2680 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2681 
2682 	return err;
2683 }
2684 
2685 static void
2686 select_commit(struct tog_log_view_state *s)
2687 {
2688 	struct commit_queue_entry *entry;
2689 	int ncommits = 0;
2690 
2691 	entry = s->first_displayed_entry;
2692 	while (entry) {
2693 		if (ncommits == s->selected) {
2694 			s->selected_entry = entry;
2695 			break;
2696 		}
2697 		entry = TAILQ_NEXT(entry, entry);
2698 		ncommits++;
2699 	}
2700 }
2701 
2702 static const struct got_error *
2703 draw_commits(struct tog_view *view)
2704 {
2705 	const struct got_error *err = NULL;
2706 	struct tog_log_view_state *s = &view->state.log;
2707 	struct commit_queue_entry *entry = s->selected_entry;
2708 	int limit = view->nlines;
2709 	int width;
2710 	int ncommits, author_cols = 4;
2711 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2712 	char *refs_str = NULL;
2713 	wchar_t *wline;
2714 	struct tog_color *tc;
2715 	static const size_t date_display_cols = 12;
2716 
2717 	if (view_is_hsplit_top(view))
2718 		--limit;  /* account for border */
2719 
2720 	if (s->selected_entry &&
2721 	    !(view->searching && view->search_next_done == 0)) {
2722 		struct got_reflist_head *refs;
2723 		err = got_object_id_str(&id_str, s->selected_entry->id);
2724 		if (err)
2725 			return err;
2726 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2727 		    s->selected_entry->id);
2728 		if (refs) {
2729 			err = build_refs_str(&refs_str, refs,
2730 			    s->selected_entry->id, s->repo);
2731 			if (err)
2732 				goto done;
2733 		}
2734 	}
2735 
2736 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2737 		halfdelay(10); /* disable fast refresh */
2738 
2739 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2740 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2741 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2742 		    (view->searching && !view->search_next_done) ?
2743 		    "searching..." : "loading...") == -1) {
2744 			err = got_error_from_errno("asprintf");
2745 			goto done;
2746 		}
2747 	} else {
2748 		const char *search_str = NULL;
2749 		const char *limit_str = NULL;
2750 
2751 		if (view->searching) {
2752 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2753 				search_str = "no more matches";
2754 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2755 				search_str = "no matches found";
2756 			else if (!view->search_next_done)
2757 				search_str = "searching...";
2758 		}
2759 
2760 		if (s->limit_view && s->commits->ncommits == 0)
2761 			limit_str = "no matches found";
2762 
2763 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2764 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2765 		    search_str ? search_str : (refs_str ? refs_str : ""),
2766 		    limit_str ? limit_str : "") == -1) {
2767 			err = got_error_from_errno("asprintf");
2768 			goto done;
2769 		}
2770 	}
2771 
2772 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2773 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2774 		    "........................................",
2775 		    s->in_repo_path, ncommits_str) == -1) {
2776 			err = got_error_from_errno("asprintf");
2777 			header = NULL;
2778 			goto done;
2779 		}
2780 	} else if (asprintf(&header, "commit %s%s",
2781 	    id_str ? id_str : "........................................",
2782 	    ncommits_str) == -1) {
2783 		err = got_error_from_errno("asprintf");
2784 		header = NULL;
2785 		goto done;
2786 	}
2787 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2788 	if (err)
2789 		goto done;
2790 
2791 	werase(view->window);
2792 
2793 	if (view_needs_focus_indication(view))
2794 		wstandout(view->window);
2795 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2796 	if (tc)
2797 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2798 	waddwstr(view->window, wline);
2799 	while (width < view->ncols) {
2800 		waddch(view->window, ' ');
2801 		width++;
2802 	}
2803 	if (tc)
2804 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2805 	if (view_needs_focus_indication(view))
2806 		wstandend(view->window);
2807 	free(wline);
2808 	if (limit <= 1)
2809 		goto done;
2810 
2811 	/* Grow author column size if necessary, and set view->maxx. */
2812 	entry = s->first_displayed_entry;
2813 	ncommits = 0;
2814 	view->maxx = 0;
2815 	while (entry) {
2816 		struct got_commit_object *c = entry->commit;
2817 		char *author, *eol, *msg, *msg0;
2818 		wchar_t *wauthor, *wmsg;
2819 		int width;
2820 		if (ncommits >= limit - 1)
2821 			break;
2822 		if (s->use_committer)
2823 			author = strdup(got_object_commit_get_committer(c));
2824 		else
2825 			author = strdup(got_object_commit_get_author(c));
2826 		if (author == NULL) {
2827 			err = got_error_from_errno("strdup");
2828 			goto done;
2829 		}
2830 		err = format_author(&wauthor, &width, author, COLS,
2831 		    date_display_cols);
2832 		if (author_cols < width)
2833 			author_cols = width;
2834 		free(wauthor);
2835 		free(author);
2836 		if (err)
2837 			goto done;
2838 		err = got_object_commit_get_logmsg(&msg0, c);
2839 		if (err)
2840 			goto done;
2841 		msg = msg0;
2842 		while (*msg == '\n')
2843 			++msg;
2844 		if ((eol = strchr(msg, '\n')))
2845 			*eol = '\0';
2846 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2847 		    date_display_cols + author_cols, 0);
2848 		if (err)
2849 			goto done;
2850 		view->maxx = MAX(view->maxx, width);
2851 		free(msg0);
2852 		free(wmsg);
2853 		ncommits++;
2854 		entry = TAILQ_NEXT(entry, entry);
2855 	}
2856 
2857 	entry = s->first_displayed_entry;
2858 	s->last_displayed_entry = s->first_displayed_entry;
2859 	ncommits = 0;
2860 	while (entry) {
2861 		if (ncommits >= limit - 1)
2862 			break;
2863 		if (ncommits == s->selected)
2864 			wstandout(view->window);
2865 		err = draw_commit(view, entry->commit, entry->id,
2866 		    date_display_cols, author_cols);
2867 		if (ncommits == s->selected)
2868 			wstandend(view->window);
2869 		if (err)
2870 			goto done;
2871 		ncommits++;
2872 		s->last_displayed_entry = entry;
2873 		entry = TAILQ_NEXT(entry, entry);
2874 	}
2875 
2876 	view_border(view);
2877 done:
2878 	free(id_str);
2879 	free(refs_str);
2880 	free(ncommits_str);
2881 	free(header);
2882 	return err;
2883 }
2884 
2885 static void
2886 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2887 {
2888 	struct commit_queue_entry *entry;
2889 	int nscrolled = 0;
2890 
2891 	entry = TAILQ_FIRST(&s->commits->head);
2892 	if (s->first_displayed_entry == entry)
2893 		return;
2894 
2895 	entry = s->first_displayed_entry;
2896 	while (entry && nscrolled < maxscroll) {
2897 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2898 		if (entry) {
2899 			s->first_displayed_entry = entry;
2900 			nscrolled++;
2901 		}
2902 	}
2903 }
2904 
2905 static const struct got_error *
2906 trigger_log_thread(struct tog_view *view, int wait)
2907 {
2908 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2909 	int errcode;
2910 
2911 	if (!using_mock_io)
2912 		halfdelay(1); /* fast refresh while loading commits */
2913 
2914 	while (!ta->log_complete && !tog_thread_error &&
2915 	    (ta->commits_needed > 0 || ta->load_all)) {
2916 		/* Wake the log thread. */
2917 		errcode = pthread_cond_signal(&ta->need_commits);
2918 		if (errcode)
2919 			return got_error_set_errno(errcode,
2920 			    "pthread_cond_signal");
2921 
2922 		/*
2923 		 * The mutex will be released while the view loop waits
2924 		 * in wgetch(), at which time the log thread will run.
2925 		 */
2926 		if (!wait)
2927 			break;
2928 
2929 		/* Display progress update in log view. */
2930 		show_log_view(view);
2931 		update_panels();
2932 		doupdate();
2933 
2934 		/* Wait right here while next commit is being loaded. */
2935 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2936 		if (errcode)
2937 			return got_error_set_errno(errcode,
2938 			    "pthread_cond_wait");
2939 
2940 		/* Display progress update in log view. */
2941 		show_log_view(view);
2942 		update_panels();
2943 		doupdate();
2944 	}
2945 
2946 	return NULL;
2947 }
2948 
2949 static const struct got_error *
2950 request_log_commits(struct tog_view *view)
2951 {
2952 	struct tog_log_view_state	*state = &view->state.log;
2953 	const struct got_error		*err = NULL;
2954 
2955 	if (state->thread_args.log_complete)
2956 		return NULL;
2957 
2958 	state->thread_args.commits_needed += view->nscrolled;
2959 	err = trigger_log_thread(view, 1);
2960 	view->nscrolled = 0;
2961 
2962 	return err;
2963 }
2964 
2965 static const struct got_error *
2966 log_scroll_down(struct tog_view *view, int maxscroll)
2967 {
2968 	struct tog_log_view_state *s = &view->state.log;
2969 	const struct got_error *err = NULL;
2970 	struct commit_queue_entry *pentry;
2971 	int nscrolled = 0, ncommits_needed;
2972 
2973 	if (s->last_displayed_entry == NULL)
2974 		return NULL;
2975 
2976 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2977 	if (s->commits->ncommits < ncommits_needed &&
2978 	    !s->thread_args.log_complete) {
2979 		/*
2980 		 * Ask the log thread for required amount of commits.
2981 		 */
2982 		s->thread_args.commits_needed +=
2983 		    ncommits_needed - s->commits->ncommits;
2984 		err = trigger_log_thread(view, 1);
2985 		if (err)
2986 			return err;
2987 	}
2988 
2989 	do {
2990 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2991 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2992 			break;
2993 
2994 		s->last_displayed_entry = pentry ?
2995 		    pentry : s->last_displayed_entry;
2996 
2997 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2998 		if (pentry == NULL)
2999 			break;
3000 		s->first_displayed_entry = pentry;
3001 	} while (++nscrolled < maxscroll);
3002 
3003 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3004 		view->nscrolled += nscrolled;
3005 	else
3006 		view->nscrolled = 0;
3007 
3008 	return err;
3009 }
3010 
3011 static const struct got_error *
3012 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3013     struct got_commit_object *commit, struct got_object_id *commit_id,
3014     struct tog_view *log_view, struct got_repository *repo)
3015 {
3016 	const struct got_error *err;
3017 	struct got_object_qid *parent_id;
3018 	struct tog_view *diff_view;
3019 
3020 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3021 	if (diff_view == NULL)
3022 		return got_error_from_errno("view_open");
3023 
3024 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3025 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3026 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3027 	if (err == NULL)
3028 		*new_view = diff_view;
3029 	return err;
3030 }
3031 
3032 static const struct got_error *
3033 tree_view_visit_subtree(struct tog_tree_view_state *s,
3034     struct got_tree_object *subtree)
3035 {
3036 	struct tog_parent_tree *parent;
3037 
3038 	parent = calloc(1, sizeof(*parent));
3039 	if (parent == NULL)
3040 		return got_error_from_errno("calloc");
3041 
3042 	parent->tree = s->tree;
3043 	parent->first_displayed_entry = s->first_displayed_entry;
3044 	parent->selected_entry = s->selected_entry;
3045 	parent->selected = s->selected;
3046 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3047 	s->tree = subtree;
3048 	s->selected = 0;
3049 	s->first_displayed_entry = NULL;
3050 	return NULL;
3051 }
3052 
3053 static const struct got_error *
3054 tree_view_walk_path(struct tog_tree_view_state *s,
3055     struct got_commit_object *commit, const char *path)
3056 {
3057 	const struct got_error *err = NULL;
3058 	struct got_tree_object *tree = NULL;
3059 	const char *p;
3060 	char *slash, *subpath = NULL;
3061 
3062 	/* Walk the path and open corresponding tree objects. */
3063 	p = path;
3064 	while (*p) {
3065 		struct got_tree_entry *te;
3066 		struct got_object_id *tree_id;
3067 		char *te_name;
3068 
3069 		while (p[0] == '/')
3070 			p++;
3071 
3072 		/* Ensure the correct subtree entry is selected. */
3073 		slash = strchr(p, '/');
3074 		if (slash == NULL)
3075 			te_name = strdup(p);
3076 		else
3077 			te_name = strndup(p, slash - p);
3078 		if (te_name == NULL) {
3079 			err = got_error_from_errno("strndup");
3080 			break;
3081 		}
3082 		te = got_object_tree_find_entry(s->tree, te_name);
3083 		if (te == NULL) {
3084 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3085 			free(te_name);
3086 			break;
3087 		}
3088 		free(te_name);
3089 		s->first_displayed_entry = s->selected_entry = te;
3090 
3091 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3092 			break; /* jump to this file's entry */
3093 
3094 		slash = strchr(p, '/');
3095 		if (slash)
3096 			subpath = strndup(path, slash - path);
3097 		else
3098 			subpath = strdup(path);
3099 		if (subpath == NULL) {
3100 			err = got_error_from_errno("strdup");
3101 			break;
3102 		}
3103 
3104 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3105 		    subpath);
3106 		if (err)
3107 			break;
3108 
3109 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3110 		free(tree_id);
3111 		if (err)
3112 			break;
3113 
3114 		err = tree_view_visit_subtree(s, tree);
3115 		if (err) {
3116 			got_object_tree_close(tree);
3117 			break;
3118 		}
3119 		if (slash == NULL)
3120 			break;
3121 		free(subpath);
3122 		subpath = NULL;
3123 		p = slash;
3124 	}
3125 
3126 	free(subpath);
3127 	return err;
3128 }
3129 
3130 static const struct got_error *
3131 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3132     struct commit_queue_entry *entry, const char *path,
3133     const char *head_ref_name, struct got_repository *repo)
3134 {
3135 	const struct got_error *err = NULL;
3136 	struct tog_tree_view_state *s;
3137 	struct tog_view *tree_view;
3138 
3139 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3140 	if (tree_view == NULL)
3141 		return got_error_from_errno("view_open");
3142 
3143 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3144 	if (err)
3145 		return err;
3146 	s = &tree_view->state.tree;
3147 
3148 	*new_view = tree_view;
3149 
3150 	if (got_path_is_root_dir(path))
3151 		return NULL;
3152 
3153 	return tree_view_walk_path(s, entry->commit, path);
3154 }
3155 
3156 static const struct got_error *
3157 block_signals_used_by_main_thread(void)
3158 {
3159 	sigset_t sigset;
3160 	int errcode;
3161 
3162 	if (sigemptyset(&sigset) == -1)
3163 		return got_error_from_errno("sigemptyset");
3164 
3165 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3166 	if (sigaddset(&sigset, SIGWINCH) == -1)
3167 		return got_error_from_errno("sigaddset");
3168 	if (sigaddset(&sigset, SIGCONT) == -1)
3169 		return got_error_from_errno("sigaddset");
3170 	if (sigaddset(&sigset, SIGINT) == -1)
3171 		return got_error_from_errno("sigaddset");
3172 	if (sigaddset(&sigset, SIGTERM) == -1)
3173 		return got_error_from_errno("sigaddset");
3174 
3175 	/* ncurses handles SIGTSTP */
3176 	if (sigaddset(&sigset, SIGTSTP) == -1)
3177 		return got_error_from_errno("sigaddset");
3178 
3179 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3180 	if (errcode)
3181 		return got_error_set_errno(errcode, "pthread_sigmask");
3182 
3183 	return NULL;
3184 }
3185 
3186 static void *
3187 log_thread(void *arg)
3188 {
3189 	const struct got_error *err = NULL;
3190 	int errcode = 0;
3191 	struct tog_log_thread_args *a = arg;
3192 	int done = 0;
3193 
3194 	/*
3195 	 * Sync startup with main thread such that we begin our
3196 	 * work once view_input() has released the mutex.
3197 	 */
3198 	errcode = pthread_mutex_lock(&tog_mutex);
3199 	if (errcode) {
3200 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3201 		return (void *)err;
3202 	}
3203 
3204 	err = block_signals_used_by_main_thread();
3205 	if (err) {
3206 		pthread_mutex_unlock(&tog_mutex);
3207 		goto done;
3208 	}
3209 
3210 	while (!done && !err && !tog_fatal_signal_received()) {
3211 		errcode = pthread_mutex_unlock(&tog_mutex);
3212 		if (errcode) {
3213 			err = got_error_set_errno(errcode,
3214 			    "pthread_mutex_unlock");
3215 			goto done;
3216 		}
3217 		err = queue_commits(a);
3218 		if (err) {
3219 			if (err->code != GOT_ERR_ITER_COMPLETED)
3220 				goto done;
3221 			err = NULL;
3222 			done = 1;
3223 		} else if (a->commits_needed > 0 && !a->load_all) {
3224 			if (*a->limiting) {
3225 				if (a->limit_match)
3226 					a->commits_needed--;
3227 			} else
3228 				a->commits_needed--;
3229 		}
3230 
3231 		errcode = pthread_mutex_lock(&tog_mutex);
3232 		if (errcode) {
3233 			err = got_error_set_errno(errcode,
3234 			    "pthread_mutex_lock");
3235 			goto done;
3236 		} else if (*a->quit)
3237 			done = 1;
3238 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3239 			*a->first_displayed_entry =
3240 			    TAILQ_FIRST(&a->limit_commits->head);
3241 			*a->selected_entry = *a->first_displayed_entry;
3242 		} else if (*a->first_displayed_entry == NULL) {
3243 			*a->first_displayed_entry =
3244 			    TAILQ_FIRST(&a->real_commits->head);
3245 			*a->selected_entry = *a->first_displayed_entry;
3246 		}
3247 
3248 		errcode = pthread_cond_signal(&a->commit_loaded);
3249 		if (errcode) {
3250 			err = got_error_set_errno(errcode,
3251 			    "pthread_cond_signal");
3252 			pthread_mutex_unlock(&tog_mutex);
3253 			goto done;
3254 		}
3255 
3256 		if (done)
3257 			a->commits_needed = 0;
3258 		else {
3259 			if (a->commits_needed == 0 && !a->load_all) {
3260 				errcode = pthread_cond_wait(&a->need_commits,
3261 				    &tog_mutex);
3262 				if (errcode) {
3263 					err = got_error_set_errno(errcode,
3264 					    "pthread_cond_wait");
3265 					pthread_mutex_unlock(&tog_mutex);
3266 					goto done;
3267 				}
3268 				if (*a->quit)
3269 					done = 1;
3270 			}
3271 		}
3272 	}
3273 	a->log_complete = 1;
3274 	errcode = pthread_mutex_unlock(&tog_mutex);
3275 	if (errcode)
3276 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3277 done:
3278 	if (err) {
3279 		tog_thread_error = 1;
3280 		pthread_cond_signal(&a->commit_loaded);
3281 	}
3282 	return (void *)err;
3283 }
3284 
3285 static const struct got_error *
3286 stop_log_thread(struct tog_log_view_state *s)
3287 {
3288 	const struct got_error *err = NULL, *thread_err = NULL;
3289 	int errcode;
3290 
3291 	if (s->thread) {
3292 		s->quit = 1;
3293 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3294 		if (errcode)
3295 			return got_error_set_errno(errcode,
3296 			    "pthread_cond_signal");
3297 		errcode = pthread_mutex_unlock(&tog_mutex);
3298 		if (errcode)
3299 			return got_error_set_errno(errcode,
3300 			    "pthread_mutex_unlock");
3301 		errcode = pthread_join(s->thread, (void **)&thread_err);
3302 		if (errcode)
3303 			return got_error_set_errno(errcode, "pthread_join");
3304 		errcode = pthread_mutex_lock(&tog_mutex);
3305 		if (errcode)
3306 			return got_error_set_errno(errcode,
3307 			    "pthread_mutex_lock");
3308 		s->thread = NULL;
3309 	}
3310 
3311 	if (s->thread_args.repo) {
3312 		err = got_repo_close(s->thread_args.repo);
3313 		s->thread_args.repo = NULL;
3314 	}
3315 
3316 	if (s->thread_args.pack_fds) {
3317 		const struct got_error *pack_err =
3318 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3319 		if (err == NULL)
3320 			err = pack_err;
3321 		s->thread_args.pack_fds = NULL;
3322 	}
3323 
3324 	if (s->thread_args.graph) {
3325 		got_commit_graph_close(s->thread_args.graph);
3326 		s->thread_args.graph = NULL;
3327 	}
3328 
3329 	return err ? err : thread_err;
3330 }
3331 
3332 static const struct got_error *
3333 close_log_view(struct tog_view *view)
3334 {
3335 	const struct got_error *err = NULL;
3336 	struct tog_log_view_state *s = &view->state.log;
3337 	int errcode;
3338 
3339 	err = stop_log_thread(s);
3340 
3341 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3342 	if (errcode && err == NULL)
3343 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3344 
3345 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3346 	if (errcode && err == NULL)
3347 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3348 
3349 	free_commits(&s->limit_commits);
3350 	free_commits(&s->real_commits);
3351 	free(s->in_repo_path);
3352 	s->in_repo_path = NULL;
3353 	free(s->start_id);
3354 	s->start_id = NULL;
3355 	free(s->head_ref_name);
3356 	s->head_ref_name = NULL;
3357 	return err;
3358 }
3359 
3360 /*
3361  * We use two queues to implement the limit feature: first consists of
3362  * commits matching the current limit_regex; second is the real queue
3363  * of all known commits (real_commits). When the user starts limiting,
3364  * we swap queues such that all movement and displaying functionality
3365  * works with very slight change.
3366  */
3367 static const struct got_error *
3368 limit_log_view(struct tog_view *view)
3369 {
3370 	struct tog_log_view_state *s = &view->state.log;
3371 	struct commit_queue_entry *entry;
3372 	struct tog_view	*v = view;
3373 	const struct got_error *err = NULL;
3374 	char pattern[1024];
3375 	int ret;
3376 
3377 	if (view_is_hsplit_top(view))
3378 		v = view->child;
3379 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3380 		v = view->parent;
3381 
3382 	/* Get the pattern */
3383 	wmove(v->window, v->nlines - 1, 0);
3384 	wclrtoeol(v->window);
3385 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3386 	nodelay(v->window, FALSE);
3387 	nocbreak();
3388 	echo();
3389 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3390 	cbreak();
3391 	noecho();
3392 	nodelay(v->window, TRUE);
3393 	if (ret == ERR)
3394 		return NULL;
3395 
3396 	if (*pattern == '\0') {
3397 		/*
3398 		 * Safety measure for the situation where the user
3399 		 * resets limit without previously limiting anything.
3400 		 */
3401 		if (!s->limit_view)
3402 			return NULL;
3403 
3404 		/*
3405 		 * User could have pressed Ctrl+L, which refreshed the
3406 		 * commit queues, it means we can't save previously
3407 		 * (before limit took place) displayed entries,
3408 		 * because they would point to already free'ed memory,
3409 		 * so we are forced to always select first entry of
3410 		 * the queue.
3411 		 */
3412 		s->commits = &s->real_commits;
3413 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3414 		s->selected_entry = s->first_displayed_entry;
3415 		s->selected = 0;
3416 		s->limit_view = 0;
3417 
3418 		return NULL;
3419 	}
3420 
3421 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3422 		return NULL;
3423 
3424 	s->limit_view = 1;
3425 
3426 	/* Clear the screen while loading limit view */
3427 	s->first_displayed_entry = NULL;
3428 	s->last_displayed_entry = NULL;
3429 	s->selected_entry = NULL;
3430 	s->commits = &s->limit_commits;
3431 
3432 	/* Prepare limit queue for new search */
3433 	free_commits(&s->limit_commits);
3434 	s->limit_commits.ncommits = 0;
3435 
3436 	/* First process commits, which are in queue already */
3437 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3438 		int have_match = 0;
3439 
3440 		err = match_commit(&have_match, entry->id,
3441 		    entry->commit, &s->limit_regex);
3442 		if (err)
3443 			return err;
3444 
3445 		if (have_match) {
3446 			struct commit_queue_entry *matched;
3447 
3448 			matched = alloc_commit_queue_entry(entry->commit,
3449 			    entry->id);
3450 			if (matched == NULL) {
3451 				err = got_error_from_errno(
3452 				    "alloc_commit_queue_entry");
3453 				break;
3454 			}
3455 			matched->commit = entry->commit;
3456 			got_object_commit_retain(entry->commit);
3457 
3458 			matched->idx = s->limit_commits.ncommits;
3459 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3460 			    matched, entry);
3461 			s->limit_commits.ncommits++;
3462 		}
3463 	}
3464 
3465 	/* Second process all the commits, until we fill the screen */
3466 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3467 	    !s->thread_args.log_complete) {
3468 		s->thread_args.commits_needed +=
3469 		    view->nlines - s->limit_commits.ncommits - 1;
3470 		err = trigger_log_thread(view, 1);
3471 		if (err)
3472 			return err;
3473 	}
3474 
3475 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3476 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3477 	s->selected = 0;
3478 
3479 	return NULL;
3480 }
3481 
3482 static const struct got_error *
3483 search_start_log_view(struct tog_view *view)
3484 {
3485 	struct tog_log_view_state *s = &view->state.log;
3486 
3487 	s->matched_entry = NULL;
3488 	s->search_entry = NULL;
3489 	return NULL;
3490 }
3491 
3492 static const struct got_error *
3493 search_next_log_view(struct tog_view *view)
3494 {
3495 	const struct got_error *err = NULL;
3496 	struct tog_log_view_state *s = &view->state.log;
3497 	struct commit_queue_entry *entry;
3498 
3499 	/* Display progress update in log view. */
3500 	show_log_view(view);
3501 	update_panels();
3502 	doupdate();
3503 
3504 	if (s->search_entry) {
3505 		int errcode, ch;
3506 		errcode = pthread_mutex_unlock(&tog_mutex);
3507 		if (errcode)
3508 			return got_error_set_errno(errcode,
3509 			    "pthread_mutex_unlock");
3510 		ch = wgetch(view->window);
3511 		errcode = pthread_mutex_lock(&tog_mutex);
3512 		if (errcode)
3513 			return got_error_set_errno(errcode,
3514 			    "pthread_mutex_lock");
3515 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3516 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3517 			return NULL;
3518 		}
3519 		if (view->searching == TOG_SEARCH_FORWARD)
3520 			entry = TAILQ_NEXT(s->search_entry, entry);
3521 		else
3522 			entry = TAILQ_PREV(s->search_entry,
3523 			    commit_queue_head, entry);
3524 	} else if (s->matched_entry) {
3525 		/*
3526 		 * If the user has moved the cursor after we hit a match,
3527 		 * the position from where we should continue searching
3528 		 * might have changed.
3529 		 */
3530 		if (view->searching == TOG_SEARCH_FORWARD)
3531 			entry = TAILQ_NEXT(s->selected_entry, entry);
3532 		else
3533 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3534 			    entry);
3535 	} else {
3536 		entry = s->selected_entry;
3537 	}
3538 
3539 	while (1) {
3540 		int have_match = 0;
3541 
3542 		if (entry == NULL) {
3543 			if (s->thread_args.log_complete ||
3544 			    view->searching == TOG_SEARCH_BACKWARD) {
3545 				view->search_next_done =
3546 				    (s->matched_entry == NULL ?
3547 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3548 				s->search_entry = NULL;
3549 				return NULL;
3550 			}
3551 			/*
3552 			 * Poke the log thread for more commits and return,
3553 			 * allowing the main loop to make progress. Search
3554 			 * will resume at s->search_entry once we come back.
3555 			 */
3556 			s->thread_args.commits_needed++;
3557 			return trigger_log_thread(view, 0);
3558 		}
3559 
3560 		err = match_commit(&have_match, entry->id, entry->commit,
3561 		    &view->regex);
3562 		if (err)
3563 			break;
3564 		if (have_match) {
3565 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3566 			s->matched_entry = entry;
3567 			break;
3568 		}
3569 
3570 		s->search_entry = entry;
3571 		if (view->searching == TOG_SEARCH_FORWARD)
3572 			entry = TAILQ_NEXT(entry, entry);
3573 		else
3574 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3575 	}
3576 
3577 	if (s->matched_entry) {
3578 		int cur = s->selected_entry->idx;
3579 		while (cur < s->matched_entry->idx) {
3580 			err = input_log_view(NULL, view, KEY_DOWN);
3581 			if (err)
3582 				return err;
3583 			cur++;
3584 		}
3585 		while (cur > s->matched_entry->idx) {
3586 			err = input_log_view(NULL, view, KEY_UP);
3587 			if (err)
3588 				return err;
3589 			cur--;
3590 		}
3591 	}
3592 
3593 	s->search_entry = NULL;
3594 
3595 	return NULL;
3596 }
3597 
3598 static const struct got_error *
3599 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3600     struct got_repository *repo, const char *head_ref_name,
3601     const char *in_repo_path, int log_branches)
3602 {
3603 	const struct got_error *err = NULL;
3604 	struct tog_log_view_state *s = &view->state.log;
3605 	struct got_repository *thread_repo = NULL;
3606 	struct got_commit_graph *thread_graph = NULL;
3607 	int errcode;
3608 
3609 	if (in_repo_path != s->in_repo_path) {
3610 		free(s->in_repo_path);
3611 		s->in_repo_path = strdup(in_repo_path);
3612 		if (s->in_repo_path == NULL) {
3613 			err = got_error_from_errno("strdup");
3614 			goto done;
3615 		}
3616 	}
3617 
3618 	/* The commit queue only contains commits being displayed. */
3619 	TAILQ_INIT(&s->real_commits.head);
3620 	s->real_commits.ncommits = 0;
3621 	s->commits = &s->real_commits;
3622 
3623 	TAILQ_INIT(&s->limit_commits.head);
3624 	s->limit_view = 0;
3625 	s->limit_commits.ncommits = 0;
3626 
3627 	s->repo = repo;
3628 	if (head_ref_name) {
3629 		s->head_ref_name = strdup(head_ref_name);
3630 		if (s->head_ref_name == NULL) {
3631 			err = got_error_from_errno("strdup");
3632 			goto done;
3633 		}
3634 	}
3635 	s->start_id = got_object_id_dup(start_id);
3636 	if (s->start_id == NULL) {
3637 		err = got_error_from_errno("got_object_id_dup");
3638 		goto done;
3639 	}
3640 	s->log_branches = log_branches;
3641 	s->use_committer = 1;
3642 
3643 	STAILQ_INIT(&s->colors);
3644 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3645 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3646 		    get_color_value("TOG_COLOR_COMMIT"));
3647 		if (err)
3648 			goto done;
3649 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3650 		    get_color_value("TOG_COLOR_AUTHOR"));
3651 		if (err) {
3652 			free_colors(&s->colors);
3653 			goto done;
3654 		}
3655 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3656 		    get_color_value("TOG_COLOR_DATE"));
3657 		if (err) {
3658 			free_colors(&s->colors);
3659 			goto done;
3660 		}
3661 	}
3662 
3663 	view->show = show_log_view;
3664 	view->input = input_log_view;
3665 	view->resize = resize_log_view;
3666 	view->close = close_log_view;
3667 	view->search_start = search_start_log_view;
3668 	view->search_next = search_next_log_view;
3669 
3670 	if (s->thread_args.pack_fds == NULL) {
3671 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3672 		if (err)
3673 			goto done;
3674 	}
3675 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3676 	    s->thread_args.pack_fds);
3677 	if (err)
3678 		goto done;
3679 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3680 	    !s->log_branches);
3681 	if (err)
3682 		goto done;
3683 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3684 	    s->repo, NULL, NULL);
3685 	if (err)
3686 		goto done;
3687 
3688 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3689 	if (errcode) {
3690 		err = got_error_set_errno(errcode, "pthread_cond_init");
3691 		goto done;
3692 	}
3693 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3694 	if (errcode) {
3695 		err = got_error_set_errno(errcode, "pthread_cond_init");
3696 		goto done;
3697 	}
3698 
3699 	s->thread_args.commits_needed = view->nlines;
3700 	s->thread_args.graph = thread_graph;
3701 	s->thread_args.real_commits = &s->real_commits;
3702 	s->thread_args.limit_commits = &s->limit_commits;
3703 	s->thread_args.in_repo_path = s->in_repo_path;
3704 	s->thread_args.start_id = s->start_id;
3705 	s->thread_args.repo = thread_repo;
3706 	s->thread_args.log_complete = 0;
3707 	s->thread_args.quit = &s->quit;
3708 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3709 	s->thread_args.selected_entry = &s->selected_entry;
3710 	s->thread_args.searching = &view->searching;
3711 	s->thread_args.search_next_done = &view->search_next_done;
3712 	s->thread_args.regex = &view->regex;
3713 	s->thread_args.limiting = &s->limit_view;
3714 	s->thread_args.limit_regex = &s->limit_regex;
3715 	s->thread_args.limit_commits = &s->limit_commits;
3716 done:
3717 	if (err) {
3718 		if (view->close == NULL)
3719 			close_log_view(view);
3720 		view_close(view);
3721 	}
3722 	return err;
3723 }
3724 
3725 static const struct got_error *
3726 show_log_view(struct tog_view *view)
3727 {
3728 	const struct got_error *err;
3729 	struct tog_log_view_state *s = &view->state.log;
3730 
3731 	if (s->thread == NULL) {
3732 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3733 		    &s->thread_args);
3734 		if (errcode)
3735 			return got_error_set_errno(errcode, "pthread_create");
3736 		if (s->thread_args.commits_needed > 0) {
3737 			err = trigger_log_thread(view, 1);
3738 			if (err)
3739 				return err;
3740 		}
3741 	}
3742 
3743 	return draw_commits(view);
3744 }
3745 
3746 static void
3747 log_move_cursor_up(struct tog_view *view, int page, int home)
3748 {
3749 	struct tog_log_view_state *s = &view->state.log;
3750 
3751 	if (s->first_displayed_entry == NULL)
3752 		return;
3753 	if (s->selected_entry->idx == 0)
3754 		view->count = 0;
3755 
3756 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3757 	    || home)
3758 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3759 
3760 	if (!page && !home && s->selected > 0)
3761 		--s->selected;
3762 	else
3763 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3764 
3765 	select_commit(s);
3766 	return;
3767 }
3768 
3769 static const struct got_error *
3770 log_move_cursor_down(struct tog_view *view, int page)
3771 {
3772 	struct tog_log_view_state	*s = &view->state.log;
3773 	const struct got_error		*err = NULL;
3774 	int				 eos = view->nlines - 2;
3775 
3776 	if (s->first_displayed_entry == NULL)
3777 		return NULL;
3778 
3779 	if (s->thread_args.log_complete &&
3780 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3781 		return NULL;
3782 
3783 	if (view_is_hsplit_top(view))
3784 		--eos;  /* border consumes the last line */
3785 
3786 	if (!page) {
3787 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3788 			++s->selected;
3789 		else
3790 			err = log_scroll_down(view, 1);
3791 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3792 		struct commit_queue_entry *entry;
3793 		int n;
3794 
3795 		s->selected = 0;
3796 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3797 		s->last_displayed_entry = entry;
3798 		for (n = 0; n <= eos; n++) {
3799 			if (entry == NULL)
3800 				break;
3801 			s->first_displayed_entry = entry;
3802 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3803 		}
3804 		if (n > 0)
3805 			s->selected = n - 1;
3806 	} else {
3807 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3808 		    s->thread_args.log_complete)
3809 			s->selected += MIN(page,
3810 			    s->commits->ncommits - s->selected_entry->idx - 1);
3811 		else
3812 			err = log_scroll_down(view, page);
3813 	}
3814 	if (err)
3815 		return err;
3816 
3817 	/*
3818 	 * We might necessarily overshoot in horizontal
3819 	 * splits; if so, select the last displayed commit.
3820 	 */
3821 	if (s->first_displayed_entry && s->last_displayed_entry) {
3822 		s->selected = MIN(s->selected,
3823 		    s->last_displayed_entry->idx -
3824 		    s->first_displayed_entry->idx);
3825 	}
3826 
3827 	select_commit(s);
3828 
3829 	if (s->thread_args.log_complete &&
3830 	    s->selected_entry->idx == s->commits->ncommits - 1)
3831 		view->count = 0;
3832 
3833 	return NULL;
3834 }
3835 
3836 static void
3837 view_get_split(struct tog_view *view, int *y, int *x)
3838 {
3839 	*x = 0;
3840 	*y = 0;
3841 
3842 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3843 		if (view->child && view->child->resized_y)
3844 			*y = view->child->resized_y;
3845 		else if (view->resized_y)
3846 			*y = view->resized_y;
3847 		else
3848 			*y = view_split_begin_y(view->lines);
3849 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3850 		if (view->child && view->child->resized_x)
3851 			*x = view->child->resized_x;
3852 		else if (view->resized_x)
3853 			*x = view->resized_x;
3854 		else
3855 			*x = view_split_begin_x(view->begin_x);
3856 	}
3857 }
3858 
3859 /* Split view horizontally at y and offset view->state->selected line. */
3860 static const struct got_error *
3861 view_init_hsplit(struct tog_view *view, int y)
3862 {
3863 	const struct got_error *err = NULL;
3864 
3865 	view->nlines = y;
3866 	view->ncols = COLS;
3867 	err = view_resize(view);
3868 	if (err)
3869 		return err;
3870 
3871 	err = offset_selection_down(view);
3872 
3873 	return err;
3874 }
3875 
3876 static const struct got_error *
3877 log_goto_line(struct tog_view *view, int nlines)
3878 {
3879 	const struct got_error		*err = NULL;
3880 	struct tog_log_view_state	*s = &view->state.log;
3881 	int				 g, idx = s->selected_entry->idx;
3882 
3883 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3884 		return NULL;
3885 
3886 	g = view->gline;
3887 	view->gline = 0;
3888 
3889 	if (g >= s->first_displayed_entry->idx + 1 &&
3890 	    g <= s->last_displayed_entry->idx + 1 &&
3891 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3892 		s->selected = g - s->first_displayed_entry->idx - 1;
3893 		select_commit(s);
3894 		return NULL;
3895 	}
3896 
3897 	if (idx + 1 < g) {
3898 		err = log_move_cursor_down(view, g - idx - 1);
3899 		if (!err && g > s->selected_entry->idx + 1)
3900 			err = log_move_cursor_down(view,
3901 			    g - s->first_displayed_entry->idx - 1);
3902 		if (err)
3903 			return err;
3904 	} else if (idx + 1 > g)
3905 		log_move_cursor_up(view, idx - g + 1, 0);
3906 
3907 	if (g < nlines && s->first_displayed_entry->idx == 0)
3908 		s->selected = g - 1;
3909 
3910 	select_commit(s);
3911 	return NULL;
3912 
3913 }
3914 
3915 static void
3916 horizontal_scroll_input(struct tog_view *view, int ch)
3917 {
3918 
3919 	switch (ch) {
3920 	case KEY_LEFT:
3921 	case 'h':
3922 		view->x -= MIN(view->x, 2);
3923 		if (view->x <= 0)
3924 			view->count = 0;
3925 		break;
3926 	case KEY_RIGHT:
3927 	case 'l':
3928 		if (view->x + view->ncols / 2 < view->maxx)
3929 			view->x += 2;
3930 		else
3931 			view->count = 0;
3932 		break;
3933 	case '0':
3934 		view->x = 0;
3935 		break;
3936 	case '$':
3937 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3938 		view->count = 0;
3939 		break;
3940 	default:
3941 		break;
3942 	}
3943 }
3944 
3945 static const struct got_error *
3946 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3947 {
3948 	const struct got_error *err = NULL;
3949 	struct tog_log_view_state *s = &view->state.log;
3950 	int eos, nscroll;
3951 
3952 	if (s->thread_args.load_all) {
3953 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3954 			s->thread_args.load_all = 0;
3955 		else if (s->thread_args.log_complete) {
3956 			err = log_move_cursor_down(view, s->commits->ncommits);
3957 			s->thread_args.load_all = 0;
3958 		}
3959 		if (err)
3960 			return err;
3961 	}
3962 
3963 	eos = nscroll = view->nlines - 1;
3964 	if (view_is_hsplit_top(view))
3965 		--eos;  /* border */
3966 
3967 	if (view->gline)
3968 		return log_goto_line(view, eos);
3969 
3970 	switch (ch) {
3971 	case '&':
3972 		err = limit_log_view(view);
3973 		break;
3974 	case 'q':
3975 		s->quit = 1;
3976 		break;
3977 	case '0':
3978 	case '$':
3979 	case KEY_RIGHT:
3980 	case 'l':
3981 	case KEY_LEFT:
3982 	case 'h':
3983 		horizontal_scroll_input(view, ch);
3984 		break;
3985 	case 'k':
3986 	case KEY_UP:
3987 	case '<':
3988 	case ',':
3989 	case CTRL('p'):
3990 		log_move_cursor_up(view, 0, 0);
3991 		break;
3992 	case 'g':
3993 	case '=':
3994 	case KEY_HOME:
3995 		log_move_cursor_up(view, 0, 1);
3996 		view->count = 0;
3997 		break;
3998 	case CTRL('u'):
3999 	case 'u':
4000 		nscroll /= 2;
4001 		/* FALL THROUGH */
4002 	case KEY_PPAGE:
4003 	case CTRL('b'):
4004 	case 'b':
4005 		log_move_cursor_up(view, nscroll, 0);
4006 		break;
4007 	case 'j':
4008 	case KEY_DOWN:
4009 	case '>':
4010 	case '.':
4011 	case CTRL('n'):
4012 		err = log_move_cursor_down(view, 0);
4013 		break;
4014 	case '@':
4015 		s->use_committer = !s->use_committer;
4016 		view->action = s->use_committer ?
4017 		    "show committer" : "show commit author";
4018 		break;
4019 	case 'G':
4020 	case '*':
4021 	case KEY_END: {
4022 		/* We don't know yet how many commits, so we're forced to
4023 		 * traverse them all. */
4024 		view->count = 0;
4025 		s->thread_args.load_all = 1;
4026 		if (!s->thread_args.log_complete)
4027 			return trigger_log_thread(view, 0);
4028 		err = log_move_cursor_down(view, s->commits->ncommits);
4029 		s->thread_args.load_all = 0;
4030 		break;
4031 	}
4032 	case CTRL('d'):
4033 	case 'd':
4034 		nscroll /= 2;
4035 		/* FALL THROUGH */
4036 	case KEY_NPAGE:
4037 	case CTRL('f'):
4038 	case 'f':
4039 	case ' ':
4040 		err = log_move_cursor_down(view, nscroll);
4041 		break;
4042 	case KEY_RESIZE:
4043 		if (s->selected > view->nlines - 2)
4044 			s->selected = view->nlines - 2;
4045 		if (s->selected > s->commits->ncommits - 1)
4046 			s->selected = s->commits->ncommits - 1;
4047 		select_commit(s);
4048 		if (s->commits->ncommits < view->nlines - 1 &&
4049 		    !s->thread_args.log_complete) {
4050 			s->thread_args.commits_needed += (view->nlines - 1) -
4051 			    s->commits->ncommits;
4052 			err = trigger_log_thread(view, 1);
4053 		}
4054 		break;
4055 	case KEY_ENTER:
4056 	case '\r':
4057 		view->count = 0;
4058 		if (s->selected_entry == NULL)
4059 			break;
4060 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4061 		break;
4062 	case 'T':
4063 		view->count = 0;
4064 		if (s->selected_entry == NULL)
4065 			break;
4066 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4067 		break;
4068 	case KEY_BACKSPACE:
4069 	case CTRL('l'):
4070 	case 'B':
4071 		view->count = 0;
4072 		if (ch == KEY_BACKSPACE &&
4073 		    got_path_is_root_dir(s->in_repo_path))
4074 			break;
4075 		err = stop_log_thread(s);
4076 		if (err)
4077 			return err;
4078 		if (ch == KEY_BACKSPACE) {
4079 			char *parent_path;
4080 			err = got_path_dirname(&parent_path, s->in_repo_path);
4081 			if (err)
4082 				return err;
4083 			free(s->in_repo_path);
4084 			s->in_repo_path = parent_path;
4085 			s->thread_args.in_repo_path = s->in_repo_path;
4086 		} else if (ch == CTRL('l')) {
4087 			struct got_object_id *start_id;
4088 			err = got_repo_match_object_id(&start_id, NULL,
4089 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4090 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4091 			if (err) {
4092 				if (s->head_ref_name == NULL ||
4093 				    err->code != GOT_ERR_NOT_REF)
4094 					return err;
4095 				/* Try to cope with deleted references. */
4096 				free(s->head_ref_name);
4097 				s->head_ref_name = NULL;
4098 				err = got_repo_match_object_id(&start_id,
4099 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4100 				    &tog_refs, s->repo);
4101 				if (err)
4102 					return err;
4103 			}
4104 			free(s->start_id);
4105 			s->start_id = start_id;
4106 			s->thread_args.start_id = s->start_id;
4107 		} else /* 'B' */
4108 			s->log_branches = !s->log_branches;
4109 
4110 		if (s->thread_args.pack_fds == NULL) {
4111 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4112 			if (err)
4113 				return err;
4114 		}
4115 		err = got_repo_open(&s->thread_args.repo,
4116 		    got_repo_get_path(s->repo), NULL,
4117 		    s->thread_args.pack_fds);
4118 		if (err)
4119 			return err;
4120 		tog_free_refs();
4121 		err = tog_load_refs(s->repo, 0);
4122 		if (err)
4123 			return err;
4124 		err = got_commit_graph_open(&s->thread_args.graph,
4125 		    s->in_repo_path, !s->log_branches);
4126 		if (err)
4127 			return err;
4128 		err = got_commit_graph_iter_start(s->thread_args.graph,
4129 		    s->start_id, s->repo, NULL, NULL);
4130 		if (err)
4131 			return err;
4132 		free_commits(&s->real_commits);
4133 		free_commits(&s->limit_commits);
4134 		s->first_displayed_entry = NULL;
4135 		s->last_displayed_entry = NULL;
4136 		s->selected_entry = NULL;
4137 		s->selected = 0;
4138 		s->thread_args.log_complete = 0;
4139 		s->quit = 0;
4140 		s->thread_args.commits_needed = view->lines;
4141 		s->matched_entry = NULL;
4142 		s->search_entry = NULL;
4143 		view->offset = 0;
4144 		break;
4145 	case 'R':
4146 		view->count = 0;
4147 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4148 		break;
4149 	default:
4150 		view->count = 0;
4151 		break;
4152 	}
4153 
4154 	return err;
4155 }
4156 
4157 static const struct got_error *
4158 apply_unveil(const char *repo_path, const char *worktree_path)
4159 {
4160 	const struct got_error *error;
4161 
4162 #ifdef PROFILE
4163 	if (unveil("gmon.out", "rwc") != 0)
4164 		return got_error_from_errno2("unveil", "gmon.out");
4165 #endif
4166 	if (repo_path && unveil(repo_path, "r") != 0)
4167 		return got_error_from_errno2("unveil", repo_path);
4168 
4169 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4170 		return got_error_from_errno2("unveil", worktree_path);
4171 
4172 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4173 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4174 
4175 	error = got_privsep_unveil_exec_helpers();
4176 	if (error != NULL)
4177 		return error;
4178 
4179 	if (unveil(NULL, NULL) != 0)
4180 		return got_error_from_errno("unveil");
4181 
4182 	return NULL;
4183 }
4184 
4185 static const struct got_error *
4186 init_mock_term(const char *test_script_path)
4187 {
4188 	const struct got_error	*err = NULL;
4189 
4190 	if (test_script_path == NULL || *test_script_path == '\0')
4191 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4192 
4193 	tog_io.f = fopen(test_script_path, "re");
4194 	if (tog_io.f == NULL) {
4195 		err = got_error_from_errno_fmt("fopen: %s",
4196 		    test_script_path);
4197 		goto done;
4198 	}
4199 
4200 	/* test mode, we don't want any output */
4201 	tog_io.cout = fopen("/dev/null", "w+");
4202 	if (tog_io.cout == NULL) {
4203 		err = got_error_from_errno("fopen: /dev/null");
4204 		goto done;
4205 	}
4206 
4207 	tog_io.cin = fopen("/dev/tty", "r+");
4208 	if (tog_io.cin == NULL) {
4209 		err = got_error_from_errno("fopen: /dev/tty");
4210 		goto done;
4211 	}
4212 
4213 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4214 		err = got_error_from_errno("fseeko");
4215 		goto done;
4216 	}
4217 
4218 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4219 		err = got_error_msg(GOT_ERR_IO,
4220 		    "newterm: failed to initialise curses");
4221 
4222 	using_mock_io = 1;
4223 
4224 done:
4225 	if (err)
4226 		tog_io_close();
4227 	return err;
4228 }
4229 
4230 static void
4231 init_curses(void)
4232 {
4233 	/*
4234 	 * Override default signal handlers before starting ncurses.
4235 	 * This should prevent ncurses from installing its own
4236 	 * broken cleanup() signal handler.
4237 	 */
4238 	signal(SIGWINCH, tog_sigwinch);
4239 	signal(SIGPIPE, tog_sigpipe);
4240 	signal(SIGCONT, tog_sigcont);
4241 	signal(SIGINT, tog_sigint);
4242 	signal(SIGTERM, tog_sigterm);
4243 
4244 	if (using_mock_io) /* In test mode we use a fake terminal */
4245 		return;
4246 
4247 	initscr();
4248 
4249 	cbreak();
4250 	halfdelay(1); /* Fast refresh while initial view is loading. */
4251 	noecho();
4252 	nonl();
4253 	intrflush(stdscr, FALSE);
4254 	keypad(stdscr, TRUE);
4255 	curs_set(0);
4256 	if (getenv("TOG_COLORS") != NULL) {
4257 		start_color();
4258 		use_default_colors();
4259 	}
4260 
4261 	return;
4262 }
4263 
4264 static const struct got_error *
4265 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4266     struct got_repository *repo, struct got_worktree *worktree)
4267 {
4268 	const struct got_error *err = NULL;
4269 
4270 	if (argc == 0) {
4271 		*in_repo_path = strdup("/");
4272 		if (*in_repo_path == NULL)
4273 			return got_error_from_errno("strdup");
4274 		return NULL;
4275 	}
4276 
4277 	if (worktree) {
4278 		const char *prefix = got_worktree_get_path_prefix(worktree);
4279 		char *p;
4280 
4281 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4282 		if (err)
4283 			return err;
4284 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4285 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4286 		    p) == -1) {
4287 			err = got_error_from_errno("asprintf");
4288 			*in_repo_path = NULL;
4289 		}
4290 		free(p);
4291 	} else
4292 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4293 
4294 	return err;
4295 }
4296 
4297 static const struct got_error *
4298 cmd_log(int argc, char *argv[])
4299 {
4300 	const struct got_error *error;
4301 	struct got_repository *repo = NULL;
4302 	struct got_worktree *worktree = NULL;
4303 	struct got_object_id *start_id = NULL;
4304 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4305 	char *start_commit = NULL, *label = NULL;
4306 	struct got_reference *ref = NULL;
4307 	const char *head_ref_name = NULL;
4308 	int ch, log_branches = 0;
4309 	struct tog_view *view;
4310 	int *pack_fds = NULL;
4311 
4312 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4313 		switch (ch) {
4314 		case 'b':
4315 			log_branches = 1;
4316 			break;
4317 		case 'c':
4318 			start_commit = optarg;
4319 			break;
4320 		case 'r':
4321 			repo_path = realpath(optarg, NULL);
4322 			if (repo_path == NULL)
4323 				return got_error_from_errno2("realpath",
4324 				    optarg);
4325 			break;
4326 		default:
4327 			usage_log();
4328 			/* NOTREACHED */
4329 		}
4330 	}
4331 
4332 	argc -= optind;
4333 	argv += optind;
4334 
4335 	if (argc > 1)
4336 		usage_log();
4337 
4338 	error = got_repo_pack_fds_open(&pack_fds);
4339 	if (error != NULL)
4340 		goto done;
4341 
4342 	if (repo_path == NULL) {
4343 		cwd = getcwd(NULL, 0);
4344 		if (cwd == NULL)
4345 			return got_error_from_errno("getcwd");
4346 		error = got_worktree_open(&worktree, cwd);
4347 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4348 			goto done;
4349 		if (worktree)
4350 			repo_path =
4351 			    strdup(got_worktree_get_repo_path(worktree));
4352 		else
4353 			repo_path = strdup(cwd);
4354 		if (repo_path == NULL) {
4355 			error = got_error_from_errno("strdup");
4356 			goto done;
4357 		}
4358 	}
4359 
4360 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4361 	if (error != NULL)
4362 		goto done;
4363 
4364 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4365 	    repo, worktree);
4366 	if (error)
4367 		goto done;
4368 
4369 	init_curses();
4370 
4371 	error = apply_unveil(got_repo_get_path(repo),
4372 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4373 	if (error)
4374 		goto done;
4375 
4376 	/* already loaded by tog_log_with_path()? */
4377 	if (TAILQ_EMPTY(&tog_refs)) {
4378 		error = tog_load_refs(repo, 0);
4379 		if (error)
4380 			goto done;
4381 	}
4382 
4383 	if (start_commit == NULL) {
4384 		error = got_repo_match_object_id(&start_id, &label,
4385 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4386 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4387 		if (error)
4388 			goto done;
4389 		head_ref_name = label;
4390 	} else {
4391 		error = got_ref_open(&ref, repo, start_commit, 0);
4392 		if (error == NULL)
4393 			head_ref_name = got_ref_get_name(ref);
4394 		else if (error->code != GOT_ERR_NOT_REF)
4395 			goto done;
4396 		error = got_repo_match_object_id(&start_id, NULL,
4397 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4398 		if (error)
4399 			goto done;
4400 	}
4401 
4402 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4403 	if (view == NULL) {
4404 		error = got_error_from_errno("view_open");
4405 		goto done;
4406 	}
4407 	error = open_log_view(view, start_id, repo, head_ref_name,
4408 	    in_repo_path, log_branches);
4409 	if (error)
4410 		goto done;
4411 	if (worktree) {
4412 		/* Release work tree lock. */
4413 		got_worktree_close(worktree);
4414 		worktree = NULL;
4415 	}
4416 	error = view_loop(view);
4417 done:
4418 	free(in_repo_path);
4419 	free(repo_path);
4420 	free(cwd);
4421 	free(start_id);
4422 	free(label);
4423 	if (ref)
4424 		got_ref_close(ref);
4425 	if (repo) {
4426 		const struct got_error *close_err = got_repo_close(repo);
4427 		if (error == NULL)
4428 			error = close_err;
4429 	}
4430 	if (worktree)
4431 		got_worktree_close(worktree);
4432 	if (pack_fds) {
4433 		const struct got_error *pack_err =
4434 		    got_repo_pack_fds_close(pack_fds);
4435 		if (error == NULL)
4436 			error = pack_err;
4437 	}
4438 	tog_free_refs();
4439 	return error;
4440 }
4441 
4442 __dead static void
4443 usage_diff(void)
4444 {
4445 	endwin();
4446 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4447 	    "object1 object2\n", getprogname());
4448 	exit(1);
4449 }
4450 
4451 static int
4452 match_line(const char *line, regex_t *regex, size_t nmatch,
4453     regmatch_t *regmatch)
4454 {
4455 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4456 }
4457 
4458 static struct tog_color *
4459 match_color(struct tog_colors *colors, const char *line)
4460 {
4461 	struct tog_color *tc = NULL;
4462 
4463 	STAILQ_FOREACH(tc, colors, entry) {
4464 		if (match_line(line, &tc->regex, 0, NULL))
4465 			return tc;
4466 	}
4467 
4468 	return NULL;
4469 }
4470 
4471 static const struct got_error *
4472 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4473     WINDOW *window, int skipcol, regmatch_t *regmatch)
4474 {
4475 	const struct got_error *err = NULL;
4476 	char *exstr = NULL;
4477 	wchar_t *wline = NULL;
4478 	int rme, rms, n, width, scrollx;
4479 	int width0 = 0, width1 = 0, width2 = 0;
4480 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4481 
4482 	*wtotal = 0;
4483 
4484 	rms = regmatch->rm_so;
4485 	rme = regmatch->rm_eo;
4486 
4487 	err = expand_tab(&exstr, line);
4488 	if (err)
4489 		return err;
4490 
4491 	/* Split the line into 3 segments, according to match offsets. */
4492 	seg0 = strndup(exstr, rms);
4493 	if (seg0 == NULL) {
4494 		err = got_error_from_errno("strndup");
4495 		goto done;
4496 	}
4497 	seg1 = strndup(exstr + rms, rme - rms);
4498 	if (seg1 == NULL) {
4499 		err = got_error_from_errno("strndup");
4500 		goto done;
4501 	}
4502 	seg2 = strdup(exstr + rme);
4503 	if (seg2 == NULL) {
4504 		err = got_error_from_errno("strndup");
4505 		goto done;
4506 	}
4507 
4508 	/* draw up to matched token if we haven't scrolled past it */
4509 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4510 	    col_tab_align, 1);
4511 	if (err)
4512 		goto done;
4513 	n = MAX(width0 - skipcol, 0);
4514 	if (n) {
4515 		free(wline);
4516 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4517 		    wlimit, col_tab_align, 1);
4518 		if (err)
4519 			goto done;
4520 		waddwstr(window, &wline[scrollx]);
4521 		wlimit -= width;
4522 		*wtotal += width;
4523 	}
4524 
4525 	if (wlimit > 0) {
4526 		int i = 0, w = 0;
4527 		size_t wlen;
4528 
4529 		free(wline);
4530 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4531 		    col_tab_align, 1);
4532 		if (err)
4533 			goto done;
4534 		wlen = wcslen(wline);
4535 		while (i < wlen) {
4536 			width = wcwidth(wline[i]);
4537 			if (width == -1) {
4538 				/* should not happen, tabs are expanded */
4539 				err = got_error(GOT_ERR_RANGE);
4540 				goto done;
4541 			}
4542 			if (width0 + w + width > skipcol)
4543 				break;
4544 			w += width;
4545 			i++;
4546 		}
4547 		/* draw (visible part of) matched token (if scrolled into it) */
4548 		if (width1 - w > 0) {
4549 			wattron(window, A_STANDOUT);
4550 			waddwstr(window, &wline[i]);
4551 			wattroff(window, A_STANDOUT);
4552 			wlimit -= (width1 - w);
4553 			*wtotal += (width1 - w);
4554 		}
4555 	}
4556 
4557 	if (wlimit > 0) {  /* draw rest of line */
4558 		free(wline);
4559 		if (skipcol > width0 + width1) {
4560 			err = format_line(&wline, &width2, &scrollx, seg2,
4561 			    skipcol - (width0 + width1), wlimit,
4562 			    col_tab_align, 1);
4563 			if (err)
4564 				goto done;
4565 			waddwstr(window, &wline[scrollx]);
4566 		} else {
4567 			err = format_line(&wline, &width2, NULL, seg2, 0,
4568 			    wlimit, col_tab_align, 1);
4569 			if (err)
4570 				goto done;
4571 			waddwstr(window, wline);
4572 		}
4573 		*wtotal += width2;
4574 	}
4575 done:
4576 	free(wline);
4577 	free(exstr);
4578 	free(seg0);
4579 	free(seg1);
4580 	free(seg2);
4581 	return err;
4582 }
4583 
4584 static int
4585 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4586 {
4587 	FILE	*f = NULL;
4588 	int	*eof, *first, *selected;
4589 
4590 	if (view->type == TOG_VIEW_DIFF) {
4591 		struct tog_diff_view_state *s = &view->state.diff;
4592 
4593 		first = &s->first_displayed_line;
4594 		selected = first;
4595 		eof = &s->eof;
4596 		f = s->f;
4597 	} else if (view->type == TOG_VIEW_HELP) {
4598 		struct tog_help_view_state *s = &view->state.help;
4599 
4600 		first = &s->first_displayed_line;
4601 		selected = first;
4602 		eof = &s->eof;
4603 		f = s->f;
4604 	} else if (view->type == TOG_VIEW_BLAME) {
4605 		struct tog_blame_view_state *s = &view->state.blame;
4606 
4607 		first = &s->first_displayed_line;
4608 		selected = &s->selected_line;
4609 		eof = &s->eof;
4610 		f = s->blame.f;
4611 	} else
4612 		return 0;
4613 
4614 	/* Center gline in the middle of the page like vi(1). */
4615 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4616 		return 0;
4617 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4618 		rewind(f);
4619 		*eof = 0;
4620 		*first = 1;
4621 		*lineno = 0;
4622 		*nprinted = 0;
4623 		return 0;
4624 	}
4625 
4626 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4627 		view->gline : (view->nlines - 3) / 2 + 1;
4628 	view->gline = 0;
4629 
4630 	return 1;
4631 }
4632 
4633 static const struct got_error *
4634 draw_file(struct tog_view *view, const char *header)
4635 {
4636 	struct tog_diff_view_state *s = &view->state.diff;
4637 	regmatch_t *regmatch = &view->regmatch;
4638 	const struct got_error *err;
4639 	int nprinted = 0;
4640 	char *line;
4641 	size_t linesize = 0;
4642 	ssize_t linelen;
4643 	wchar_t *wline;
4644 	int width;
4645 	int max_lines = view->nlines;
4646 	int nlines = s->nlines;
4647 	off_t line_offset;
4648 
4649 	s->lineno = s->first_displayed_line - 1;
4650 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4651 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4652 		return got_error_from_errno("fseek");
4653 
4654 	werase(view->window);
4655 
4656 	if (view->gline > s->nlines - 1)
4657 		view->gline = s->nlines - 1;
4658 
4659 	if (header) {
4660 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4661 		    1 : view->gline - (view->nlines - 3) / 2 :
4662 		    s->lineno + s->selected_line;
4663 
4664 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4665 			return got_error_from_errno("asprintf");
4666 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4667 		    0, 0);
4668 		free(line);
4669 		if (err)
4670 			return err;
4671 
4672 		if (view_needs_focus_indication(view))
4673 			wstandout(view->window);
4674 		waddwstr(view->window, wline);
4675 		free(wline);
4676 		wline = NULL;
4677 		while (width++ < view->ncols)
4678 			waddch(view->window, ' ');
4679 		if (view_needs_focus_indication(view))
4680 			wstandend(view->window);
4681 
4682 		if (max_lines <= 1)
4683 			return NULL;
4684 		max_lines--;
4685 	}
4686 
4687 	s->eof = 0;
4688 	view->maxx = 0;
4689 	line = NULL;
4690 	while (max_lines > 0 && nprinted < max_lines) {
4691 		enum got_diff_line_type linetype;
4692 		attr_t attr = 0;
4693 
4694 		linelen = getline(&line, &linesize, s->f);
4695 		if (linelen == -1) {
4696 			if (feof(s->f)) {
4697 				s->eof = 1;
4698 				break;
4699 			}
4700 			free(line);
4701 			return got_ferror(s->f, GOT_ERR_IO);
4702 		}
4703 
4704 		if (++s->lineno < s->first_displayed_line)
4705 			continue;
4706 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4707 			continue;
4708 		if (s->lineno == view->hiline)
4709 			attr = A_STANDOUT;
4710 
4711 		/* Set view->maxx based on full line length. */
4712 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4713 		    view->x ? 1 : 0);
4714 		if (err) {
4715 			free(line);
4716 			return err;
4717 		}
4718 		view->maxx = MAX(view->maxx, width);
4719 		free(wline);
4720 		wline = NULL;
4721 
4722 		linetype = s->lines[s->lineno].type;
4723 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4724 		    linetype < GOT_DIFF_LINE_CONTEXT)
4725 			attr |= COLOR_PAIR(linetype);
4726 		if (attr)
4727 			wattron(view->window, attr);
4728 		if (s->first_displayed_line + nprinted == s->matched_line &&
4729 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4730 			err = add_matched_line(&width, line, view->ncols, 0,
4731 			    view->window, view->x, regmatch);
4732 			if (err) {
4733 				free(line);
4734 				return err;
4735 			}
4736 		} else {
4737 			int skip;
4738 			err = format_line(&wline, &width, &skip, line,
4739 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4740 			if (err) {
4741 				free(line);
4742 				return err;
4743 			}
4744 			waddwstr(view->window, &wline[skip]);
4745 			free(wline);
4746 			wline = NULL;
4747 		}
4748 		if (s->lineno == view->hiline) {
4749 			/* highlight full gline length */
4750 			while (width++ < view->ncols)
4751 				waddch(view->window, ' ');
4752 		} else {
4753 			if (width <= view->ncols - 1)
4754 				waddch(view->window, '\n');
4755 		}
4756 		if (attr)
4757 			wattroff(view->window, attr);
4758 		if (++nprinted == 1)
4759 			s->first_displayed_line = s->lineno;
4760 	}
4761 	free(line);
4762 	if (nprinted >= 1)
4763 		s->last_displayed_line = s->first_displayed_line +
4764 		    (nprinted - 1);
4765 	else
4766 		s->last_displayed_line = s->first_displayed_line;
4767 
4768 	view_border(view);
4769 
4770 	if (s->eof) {
4771 		while (nprinted < view->nlines) {
4772 			waddch(view->window, '\n');
4773 			nprinted++;
4774 		}
4775 
4776 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4777 		    view->ncols, 0, 0);
4778 		if (err) {
4779 			return err;
4780 		}
4781 
4782 		wstandout(view->window);
4783 		waddwstr(view->window, wline);
4784 		free(wline);
4785 		wline = NULL;
4786 		wstandend(view->window);
4787 	}
4788 
4789 	return NULL;
4790 }
4791 
4792 static char *
4793 get_datestr(time_t *time, char *datebuf)
4794 {
4795 	struct tm mytm, *tm;
4796 	char *p, *s;
4797 
4798 	tm = gmtime_r(time, &mytm);
4799 	if (tm == NULL)
4800 		return NULL;
4801 	s = asctime_r(tm, datebuf);
4802 	if (s == NULL)
4803 		return NULL;
4804 	p = strchr(s, '\n');
4805 	if (p)
4806 		*p = '\0';
4807 	return s;
4808 }
4809 
4810 static const struct got_error *
4811 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4812     off_t off, uint8_t type)
4813 {
4814 	struct got_diff_line *p;
4815 
4816 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4817 	if (p == NULL)
4818 		return got_error_from_errno("reallocarray");
4819 	*lines = p;
4820 	(*lines)[*nlines].offset = off;
4821 	(*lines)[*nlines].type = type;
4822 	(*nlines)++;
4823 
4824 	return NULL;
4825 }
4826 
4827 static const struct got_error *
4828 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4829     struct got_diff_line *s_lines, size_t s_nlines)
4830 {
4831 	struct got_diff_line	*p;
4832 	char			 buf[BUFSIZ];
4833 	size_t			 i, r;
4834 
4835 	if (fseeko(src, 0L, SEEK_SET) == -1)
4836 		return got_error_from_errno("fseeko");
4837 
4838 	for (;;) {
4839 		r = fread(buf, 1, sizeof(buf), src);
4840 		if (r == 0) {
4841 			if (ferror(src))
4842 				return got_error_from_errno("fread");
4843 			if (feof(src))
4844 				break;
4845 		}
4846 		if (fwrite(buf, 1, r, dst) != r)
4847 			return got_ferror(dst, GOT_ERR_IO);
4848 	}
4849 
4850 	if (s_nlines == 0 && *d_nlines == 0)
4851 		return NULL;
4852 
4853 	/*
4854 	 * If commit info was in dst, increment line offsets
4855 	 * of the appended diff content, but skip s_lines[0]
4856 	 * because offset zero is already in *d_lines.
4857 	 */
4858 	if (*d_nlines > 0) {
4859 		for (i = 1; i < s_nlines; ++i)
4860 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4861 
4862 		if (s_nlines > 0) {
4863 			--s_nlines;
4864 			++s_lines;
4865 		}
4866 	}
4867 
4868 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4869 	if (p == NULL) {
4870 		/* d_lines is freed in close_diff_view() */
4871 		return got_error_from_errno("reallocarray");
4872 	}
4873 
4874 	*d_lines = p;
4875 
4876 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4877 	*d_nlines += s_nlines;
4878 
4879 	return NULL;
4880 }
4881 
4882 static const struct got_error *
4883 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4884     struct got_object_id *commit_id, struct got_reflist_head *refs,
4885     struct got_repository *repo, int ignore_ws, int force_text_diff,
4886     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4887 {
4888 	const struct got_error *err = NULL;
4889 	char datebuf[26], *datestr;
4890 	struct got_commit_object *commit;
4891 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4892 	time_t committer_time;
4893 	const char *author, *committer;
4894 	char *refs_str = NULL;
4895 	struct got_pathlist_entry *pe;
4896 	off_t outoff = 0;
4897 	int n;
4898 
4899 	if (refs) {
4900 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4901 		if (err)
4902 			return err;
4903 	}
4904 
4905 	err = got_object_open_as_commit(&commit, repo, commit_id);
4906 	if (err)
4907 		return err;
4908 
4909 	err = got_object_id_str(&id_str, commit_id);
4910 	if (err) {
4911 		err = got_error_from_errno("got_object_id_str");
4912 		goto done;
4913 	}
4914 
4915 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4916 	if (err)
4917 		goto done;
4918 
4919 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4920 	    refs_str ? refs_str : "", refs_str ? ")" : "");
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_META);
4927 	if (err)
4928 		goto done;
4929 
4930 	n = fprintf(outfile, "from: %s\n",
4931 	    got_object_commit_get_author(commit));
4932 	if (n < 0) {
4933 		err = got_error_from_errno("fprintf");
4934 		goto done;
4935 	}
4936 	outoff += n;
4937 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4938 	if (err)
4939 		goto done;
4940 
4941 	author = got_object_commit_get_author(commit);
4942 	committer = got_object_commit_get_committer(commit);
4943 	if (strcmp(author, committer) != 0) {
4944 		n = fprintf(outfile, "via: %s\n", committer);
4945 		if (n < 0) {
4946 			err = got_error_from_errno("fprintf");
4947 			goto done;
4948 		}
4949 		outoff += n;
4950 		err = add_line_metadata(lines, nlines, outoff,
4951 		    GOT_DIFF_LINE_AUTHOR);
4952 		if (err)
4953 			goto done;
4954 	}
4955 	committer_time = got_object_commit_get_committer_time(commit);
4956 	datestr = get_datestr(&committer_time, datebuf);
4957 	if (datestr) {
4958 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4959 		if (n < 0) {
4960 			err = got_error_from_errno("fprintf");
4961 			goto done;
4962 		}
4963 		outoff += n;
4964 		err = add_line_metadata(lines, nlines, outoff,
4965 		    GOT_DIFF_LINE_DATE);
4966 		if (err)
4967 			goto done;
4968 	}
4969 	if (got_object_commit_get_nparents(commit) > 1) {
4970 		const struct got_object_id_queue *parent_ids;
4971 		struct got_object_qid *qid;
4972 		int pn = 1;
4973 		parent_ids = got_object_commit_get_parent_ids(commit);
4974 		STAILQ_FOREACH(qid, parent_ids, entry) {
4975 			err = got_object_id_str(&id_str, &qid->id);
4976 			if (err)
4977 				goto done;
4978 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4979 			if (n < 0) {
4980 				err = got_error_from_errno("fprintf");
4981 				goto done;
4982 			}
4983 			outoff += n;
4984 			err = add_line_metadata(lines, nlines, outoff,
4985 			    GOT_DIFF_LINE_META);
4986 			if (err)
4987 				goto done;
4988 			free(id_str);
4989 			id_str = NULL;
4990 		}
4991 	}
4992 
4993 	err = got_object_commit_get_logmsg(&logmsg, commit);
4994 	if (err)
4995 		goto done;
4996 	s = logmsg;
4997 	while ((line = strsep(&s, "\n")) != NULL) {
4998 		n = fprintf(outfile, "%s\n", line);
4999 		if (n < 0) {
5000 			err = got_error_from_errno("fprintf");
5001 			goto done;
5002 		}
5003 		outoff += n;
5004 		err = add_line_metadata(lines, nlines, outoff,
5005 		    GOT_DIFF_LINE_LOGMSG);
5006 		if (err)
5007 			goto done;
5008 	}
5009 
5010 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5011 		struct got_diff_changed_path *cp = pe->data;
5012 		int pad = dsa->max_path_len - pe->path_len + 1;
5013 
5014 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5015 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5016 		    dsa->rm_cols + 1, cp->rm);
5017 		if (n < 0) {
5018 			err = got_error_from_errno("fprintf");
5019 			goto done;
5020 		}
5021 		outoff += n;
5022 		err = add_line_metadata(lines, nlines, outoff,
5023 		    GOT_DIFF_LINE_CHANGES);
5024 		if (err)
5025 			goto done;
5026 	}
5027 
5028 	fputc('\n', outfile);
5029 	outoff++;
5030 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5031 	if (err)
5032 		goto done;
5033 
5034 	n = fprintf(outfile,
5035 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5036 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5037 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5038 	if (n < 0) {
5039 		err = got_error_from_errno("fprintf");
5040 		goto done;
5041 	}
5042 	outoff += n;
5043 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5044 	if (err)
5045 		goto done;
5046 
5047 	fputc('\n', outfile);
5048 	outoff++;
5049 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5050 done:
5051 	free(id_str);
5052 	free(logmsg);
5053 	free(refs_str);
5054 	got_object_commit_close(commit);
5055 	if (err) {
5056 		free(*lines);
5057 		*lines = NULL;
5058 		*nlines = 0;
5059 	}
5060 	return err;
5061 }
5062 
5063 static const struct got_error *
5064 create_diff(struct tog_diff_view_state *s)
5065 {
5066 	const struct got_error *err = NULL;
5067 	FILE *f = NULL, *tmp_diff_file = NULL;
5068 	int obj_type;
5069 	struct got_diff_line *lines = NULL;
5070 	struct got_pathlist_head changed_paths;
5071 
5072 	TAILQ_INIT(&changed_paths);
5073 
5074 	free(s->lines);
5075 	s->lines = malloc(sizeof(*s->lines));
5076 	if (s->lines == NULL)
5077 		return got_error_from_errno("malloc");
5078 	s->nlines = 0;
5079 
5080 	f = got_opentemp();
5081 	if (f == NULL) {
5082 		err = got_error_from_errno("got_opentemp");
5083 		goto done;
5084 	}
5085 	tmp_diff_file = got_opentemp();
5086 	if (tmp_diff_file == NULL) {
5087 		err = got_error_from_errno("got_opentemp");
5088 		goto done;
5089 	}
5090 	if (s->f && fclose(s->f) == EOF) {
5091 		err = got_error_from_errno("fclose");
5092 		goto done;
5093 	}
5094 	s->f = f;
5095 
5096 	if (s->id1)
5097 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5098 	else
5099 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5100 	if (err)
5101 		goto done;
5102 
5103 	switch (obj_type) {
5104 	case GOT_OBJ_TYPE_BLOB:
5105 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5106 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5107 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5108 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5109 		    s->f);
5110 		break;
5111 	case GOT_OBJ_TYPE_TREE:
5112 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5113 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5114 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5115 		    s->force_text_diff, NULL, s->repo, s->f);
5116 		break;
5117 	case GOT_OBJ_TYPE_COMMIT: {
5118 		const struct got_object_id_queue *parent_ids;
5119 		struct got_object_qid *pid;
5120 		struct got_commit_object *commit2;
5121 		struct got_reflist_head *refs;
5122 		size_t nlines = 0;
5123 		struct got_diffstat_cb_arg dsa = {
5124 			0, 0, 0, 0, 0, 0,
5125 			&changed_paths,
5126 			s->ignore_whitespace,
5127 			s->force_text_diff,
5128 			tog_diff_algo
5129 		};
5130 
5131 		lines = malloc(sizeof(*lines));
5132 		if (lines == NULL) {
5133 			err = got_error_from_errno("malloc");
5134 			goto done;
5135 		}
5136 
5137 		/* build diff first in tmp file then append to commit info */
5138 		err = got_diff_objects_as_commits(&lines, &nlines,
5139 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5140 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5141 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5142 		if (err)
5143 			break;
5144 
5145 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5146 		if (err)
5147 			goto done;
5148 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5149 		/* Show commit info if we're diffing to a parent/root commit. */
5150 		if (s->id1 == NULL) {
5151 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5152 			    refs, s->repo, s->ignore_whitespace,
5153 			    s->force_text_diff, &dsa, s->f);
5154 			if (err)
5155 				goto done;
5156 		} else {
5157 			parent_ids = got_object_commit_get_parent_ids(commit2);
5158 			STAILQ_FOREACH(pid, parent_ids, entry) {
5159 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5160 					err = write_commit_info(&s->lines,
5161 					    &s->nlines, s->id2, refs, s->repo,
5162 					    s->ignore_whitespace,
5163 					    s->force_text_diff, &dsa, s->f);
5164 					if (err)
5165 						goto done;
5166 					break;
5167 				}
5168 			}
5169 		}
5170 		got_object_commit_close(commit2);
5171 
5172 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5173 		    lines, nlines);
5174 		break;
5175 	}
5176 	default:
5177 		err = got_error(GOT_ERR_OBJ_TYPE);
5178 		break;
5179 	}
5180 done:
5181 	free(lines);
5182 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5183 	if (s->f && fflush(s->f) != 0 && err == NULL)
5184 		err = got_error_from_errno("fflush");
5185 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5186 		err = got_error_from_errno("fclose");
5187 	return err;
5188 }
5189 
5190 static void
5191 diff_view_indicate_progress(struct tog_view *view)
5192 {
5193 	mvwaddstr(view->window, 0, 0, "diffing...");
5194 	update_panels();
5195 	doupdate();
5196 }
5197 
5198 static const struct got_error *
5199 search_start_diff_view(struct tog_view *view)
5200 {
5201 	struct tog_diff_view_state *s = &view->state.diff;
5202 
5203 	s->matched_line = 0;
5204 	return NULL;
5205 }
5206 
5207 static void
5208 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5209     size_t *nlines, int **first, int **last, int **match, int **selected)
5210 {
5211 	struct tog_diff_view_state *s = &view->state.diff;
5212 
5213 	*f = s->f;
5214 	*nlines = s->nlines;
5215 	*line_offsets = NULL;
5216 	*match = &s->matched_line;
5217 	*first = &s->first_displayed_line;
5218 	*last = &s->last_displayed_line;
5219 	*selected = &s->selected_line;
5220 }
5221 
5222 static const struct got_error *
5223 search_next_view_match(struct tog_view *view)
5224 {
5225 	const struct got_error *err = NULL;
5226 	FILE *f;
5227 	int lineno;
5228 	char *line = NULL;
5229 	size_t linesize = 0;
5230 	ssize_t linelen;
5231 	off_t *line_offsets;
5232 	size_t nlines = 0;
5233 	int *first, *last, *match, *selected;
5234 
5235 	if (!view->search_setup)
5236 		return got_error_msg(GOT_ERR_NOT_IMPL,
5237 		    "view search not supported");
5238 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5239 	    &match, &selected);
5240 
5241 	if (!view->searching) {
5242 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5243 		return NULL;
5244 	}
5245 
5246 	if (*match) {
5247 		if (view->searching == TOG_SEARCH_FORWARD)
5248 			lineno = *first + 1;
5249 		else
5250 			lineno = *first - 1;
5251 	} else
5252 		lineno = *first - 1 + *selected;
5253 
5254 	while (1) {
5255 		off_t offset;
5256 
5257 		if (lineno <= 0 || lineno > nlines) {
5258 			if (*match == 0) {
5259 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5260 				break;
5261 			}
5262 
5263 			if (view->searching == TOG_SEARCH_FORWARD)
5264 				lineno = 1;
5265 			else
5266 				lineno = nlines;
5267 		}
5268 
5269 		offset = view->type == TOG_VIEW_DIFF ?
5270 		    view->state.diff.lines[lineno - 1].offset :
5271 		    line_offsets[lineno - 1];
5272 		if (fseeko(f, offset, SEEK_SET) != 0) {
5273 			free(line);
5274 			return got_error_from_errno("fseeko");
5275 		}
5276 		linelen = getline(&line, &linesize, f);
5277 		if (linelen != -1) {
5278 			char *exstr;
5279 			err = expand_tab(&exstr, line);
5280 			if (err)
5281 				break;
5282 			if (match_line(exstr, &view->regex, 1,
5283 			    &view->regmatch)) {
5284 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5285 				*match = lineno;
5286 				free(exstr);
5287 				break;
5288 			}
5289 			free(exstr);
5290 		}
5291 		if (view->searching == TOG_SEARCH_FORWARD)
5292 			lineno++;
5293 		else
5294 			lineno--;
5295 	}
5296 	free(line);
5297 
5298 	if (*match) {
5299 		*first = *match;
5300 		*selected = 1;
5301 	}
5302 
5303 	return err;
5304 }
5305 
5306 static const struct got_error *
5307 close_diff_view(struct tog_view *view)
5308 {
5309 	const struct got_error *err = NULL;
5310 	struct tog_diff_view_state *s = &view->state.diff;
5311 
5312 	free(s->id1);
5313 	s->id1 = NULL;
5314 	free(s->id2);
5315 	s->id2 = NULL;
5316 	if (s->f && fclose(s->f) == EOF)
5317 		err = got_error_from_errno("fclose");
5318 	s->f = NULL;
5319 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5320 		err = got_error_from_errno("fclose");
5321 	s->f1 = NULL;
5322 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5323 		err = got_error_from_errno("fclose");
5324 	s->f2 = NULL;
5325 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5326 		err = got_error_from_errno("close");
5327 	s->fd1 = -1;
5328 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5329 		err = got_error_from_errno("close");
5330 	s->fd2 = -1;
5331 	free(s->lines);
5332 	s->lines = NULL;
5333 	s->nlines = 0;
5334 	return err;
5335 }
5336 
5337 static const struct got_error *
5338 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5339     struct got_object_id *id2, const char *label1, const char *label2,
5340     int diff_context, int ignore_whitespace, int force_text_diff,
5341     struct tog_view *parent_view, struct got_repository *repo)
5342 {
5343 	const struct got_error *err;
5344 	struct tog_diff_view_state *s = &view->state.diff;
5345 
5346 	memset(s, 0, sizeof(*s));
5347 	s->fd1 = -1;
5348 	s->fd2 = -1;
5349 
5350 	if (id1 != NULL && id2 != NULL) {
5351 		int type1, type2;
5352 
5353 		err = got_object_get_type(&type1, repo, id1);
5354 		if (err)
5355 			goto done;
5356 		err = got_object_get_type(&type2, repo, id2);
5357 		if (err)
5358 			goto done;
5359 
5360 		if (type1 != type2) {
5361 			err = got_error(GOT_ERR_OBJ_TYPE);
5362 			goto done;
5363 		}
5364 	}
5365 	s->first_displayed_line = 1;
5366 	s->last_displayed_line = view->nlines;
5367 	s->selected_line = 1;
5368 	s->repo = repo;
5369 	s->id1 = id1;
5370 	s->id2 = id2;
5371 	s->label1 = label1;
5372 	s->label2 = label2;
5373 
5374 	if (id1) {
5375 		s->id1 = got_object_id_dup(id1);
5376 		if (s->id1 == NULL) {
5377 			err = got_error_from_errno("got_object_id_dup");
5378 			goto done;
5379 		}
5380 	} else
5381 		s->id1 = NULL;
5382 
5383 	s->id2 = got_object_id_dup(id2);
5384 	if (s->id2 == NULL) {
5385 		err = got_error_from_errno("got_object_id_dup");
5386 		goto done;
5387 	}
5388 
5389 	s->f1 = got_opentemp();
5390 	if (s->f1 == NULL) {
5391 		err = got_error_from_errno("got_opentemp");
5392 		goto done;
5393 	}
5394 
5395 	s->f2 = got_opentemp();
5396 	if (s->f2 == NULL) {
5397 		err = got_error_from_errno("got_opentemp");
5398 		goto done;
5399 	}
5400 
5401 	s->fd1 = got_opentempfd();
5402 	if (s->fd1 == -1) {
5403 		err = got_error_from_errno("got_opentempfd");
5404 		goto done;
5405 	}
5406 
5407 	s->fd2 = got_opentempfd();
5408 	if (s->fd2 == -1) {
5409 		err = got_error_from_errno("got_opentempfd");
5410 		goto done;
5411 	}
5412 
5413 	s->diff_context = diff_context;
5414 	s->ignore_whitespace = ignore_whitespace;
5415 	s->force_text_diff = force_text_diff;
5416 	s->parent_view = parent_view;
5417 	s->repo = repo;
5418 
5419 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5420 		int rc;
5421 
5422 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5423 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5424 		if (rc != ERR)
5425 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5426 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5427 		if (rc != ERR)
5428 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5429 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5430 		if (rc != ERR)
5431 			rc = init_pair(GOT_DIFF_LINE_META,
5432 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5433 		if (rc != ERR)
5434 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5435 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5436 		if (rc != ERR)
5437 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5438 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5439 		if (rc != ERR)
5440 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5441 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5442 		if (rc != ERR)
5443 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5444 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5445 		if (rc != ERR)
5446 			rc = init_pair(GOT_DIFF_LINE_DATE,
5447 			    get_color_value("TOG_COLOR_DATE"), -1);
5448 		if (rc == ERR) {
5449 			err = got_error(GOT_ERR_RANGE);
5450 			goto done;
5451 		}
5452 	}
5453 
5454 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5455 	    view_is_splitscreen(view))
5456 		show_log_view(parent_view); /* draw border */
5457 	diff_view_indicate_progress(view);
5458 
5459 	err = create_diff(s);
5460 
5461 	view->show = show_diff_view;
5462 	view->input = input_diff_view;
5463 	view->reset = reset_diff_view;
5464 	view->close = close_diff_view;
5465 	view->search_start = search_start_diff_view;
5466 	view->search_setup = search_setup_diff_view;
5467 	view->search_next = search_next_view_match;
5468 done:
5469 	if (err) {
5470 		if (view->close == NULL)
5471 			close_diff_view(view);
5472 		view_close(view);
5473 	}
5474 	return err;
5475 }
5476 
5477 static const struct got_error *
5478 show_diff_view(struct tog_view *view)
5479 {
5480 	const struct got_error *err;
5481 	struct tog_diff_view_state *s = &view->state.diff;
5482 	char *id_str1 = NULL, *id_str2, *header;
5483 	const char *label1, *label2;
5484 
5485 	if (s->id1) {
5486 		err = got_object_id_str(&id_str1, s->id1);
5487 		if (err)
5488 			return err;
5489 		label1 = s->label1 ? s->label1 : id_str1;
5490 	} else
5491 		label1 = "/dev/null";
5492 
5493 	err = got_object_id_str(&id_str2, s->id2);
5494 	if (err)
5495 		return err;
5496 	label2 = s->label2 ? s->label2 : id_str2;
5497 
5498 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5499 		err = got_error_from_errno("asprintf");
5500 		free(id_str1);
5501 		free(id_str2);
5502 		return err;
5503 	}
5504 	free(id_str1);
5505 	free(id_str2);
5506 
5507 	err = draw_file(view, header);
5508 	free(header);
5509 	return err;
5510 }
5511 
5512 static const struct got_error *
5513 set_selected_commit(struct tog_diff_view_state *s,
5514     struct commit_queue_entry *entry)
5515 {
5516 	const struct got_error *err;
5517 	const struct got_object_id_queue *parent_ids;
5518 	struct got_commit_object *selected_commit;
5519 	struct got_object_qid *pid;
5520 
5521 	free(s->id2);
5522 	s->id2 = got_object_id_dup(entry->id);
5523 	if (s->id2 == NULL)
5524 		return got_error_from_errno("got_object_id_dup");
5525 
5526 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5527 	if (err)
5528 		return err;
5529 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5530 	free(s->id1);
5531 	pid = STAILQ_FIRST(parent_ids);
5532 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5533 	got_object_commit_close(selected_commit);
5534 	return NULL;
5535 }
5536 
5537 static const struct got_error *
5538 reset_diff_view(struct tog_view *view)
5539 {
5540 	struct tog_diff_view_state *s = &view->state.diff;
5541 
5542 	view->count = 0;
5543 	wclear(view->window);
5544 	s->first_displayed_line = 1;
5545 	s->last_displayed_line = view->nlines;
5546 	s->matched_line = 0;
5547 	diff_view_indicate_progress(view);
5548 	return create_diff(s);
5549 }
5550 
5551 static void
5552 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5553 {
5554 	int start, i;
5555 
5556 	i = start = s->first_displayed_line - 1;
5557 
5558 	while (s->lines[i].type != type) {
5559 		if (i == 0)
5560 			i = s->nlines - 1;
5561 		if (--i == start)
5562 			return; /* do nothing, requested type not in file */
5563 	}
5564 
5565 	s->selected_line = 1;
5566 	s->first_displayed_line = i;
5567 }
5568 
5569 static void
5570 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5571 {
5572 	int start, i;
5573 
5574 	i = start = s->first_displayed_line + 1;
5575 
5576 	while (s->lines[i].type != type) {
5577 		if (i == s->nlines - 1)
5578 			i = 0;
5579 		if (++i == start)
5580 			return; /* do nothing, requested type not in file */
5581 	}
5582 
5583 	s->selected_line = 1;
5584 	s->first_displayed_line = i;
5585 }
5586 
5587 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5588     int, int, int);
5589 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5590     int, int);
5591 
5592 static const struct got_error *
5593 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5594 {
5595 	const struct got_error *err = NULL;
5596 	struct tog_diff_view_state *s = &view->state.diff;
5597 	struct tog_log_view_state *ls;
5598 	struct commit_queue_entry *old_selected_entry;
5599 	char *line = NULL;
5600 	size_t linesize = 0;
5601 	ssize_t linelen;
5602 	int i, nscroll = view->nlines - 1, up = 0;
5603 
5604 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5605 
5606 	switch (ch) {
5607 	case '0':
5608 	case '$':
5609 	case KEY_RIGHT:
5610 	case 'l':
5611 	case KEY_LEFT:
5612 	case 'h':
5613 		horizontal_scroll_input(view, ch);
5614 		break;
5615 	case 'a':
5616 	case 'w':
5617 		if (ch == 'a') {
5618 			s->force_text_diff = !s->force_text_diff;
5619 			view->action = s->force_text_diff ?
5620 			    "force ASCII text enabled" :
5621 			    "force ASCII text disabled";
5622 		}
5623 		else if (ch == 'w') {
5624 			s->ignore_whitespace = !s->ignore_whitespace;
5625 			view->action = s->ignore_whitespace ?
5626 			    "ignore whitespace enabled" :
5627 			    "ignore whitespace disabled";
5628 		}
5629 		err = reset_diff_view(view);
5630 		break;
5631 	case 'g':
5632 	case KEY_HOME:
5633 		s->first_displayed_line = 1;
5634 		view->count = 0;
5635 		break;
5636 	case 'G':
5637 	case KEY_END:
5638 		view->count = 0;
5639 		if (s->eof)
5640 			break;
5641 
5642 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5643 		s->eof = 1;
5644 		break;
5645 	case 'k':
5646 	case KEY_UP:
5647 	case CTRL('p'):
5648 		if (s->first_displayed_line > 1)
5649 			s->first_displayed_line--;
5650 		else
5651 			view->count = 0;
5652 		break;
5653 	case CTRL('u'):
5654 	case 'u':
5655 		nscroll /= 2;
5656 		/* FALL THROUGH */
5657 	case KEY_PPAGE:
5658 	case CTRL('b'):
5659 	case 'b':
5660 		if (s->first_displayed_line == 1) {
5661 			view->count = 0;
5662 			break;
5663 		}
5664 		i = 0;
5665 		while (i++ < nscroll && s->first_displayed_line > 1)
5666 			s->first_displayed_line--;
5667 		break;
5668 	case 'j':
5669 	case KEY_DOWN:
5670 	case CTRL('n'):
5671 		if (!s->eof)
5672 			s->first_displayed_line++;
5673 		else
5674 			view->count = 0;
5675 		break;
5676 	case CTRL('d'):
5677 	case 'd':
5678 		nscroll /= 2;
5679 		/* FALL THROUGH */
5680 	case KEY_NPAGE:
5681 	case CTRL('f'):
5682 	case 'f':
5683 	case ' ':
5684 		if (s->eof) {
5685 			view->count = 0;
5686 			break;
5687 		}
5688 		i = 0;
5689 		while (!s->eof && i++ < nscroll) {
5690 			linelen = getline(&line, &linesize, s->f);
5691 			s->first_displayed_line++;
5692 			if (linelen == -1) {
5693 				if (feof(s->f)) {
5694 					s->eof = 1;
5695 				} else
5696 					err = got_ferror(s->f, GOT_ERR_IO);
5697 				break;
5698 			}
5699 		}
5700 		free(line);
5701 		break;
5702 	case '(':
5703 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5704 		break;
5705 	case ')':
5706 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5707 		break;
5708 	case '{':
5709 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5710 		break;
5711 	case '}':
5712 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5713 		break;
5714 	case '[':
5715 		if (s->diff_context > 0) {
5716 			s->diff_context--;
5717 			s->matched_line = 0;
5718 			diff_view_indicate_progress(view);
5719 			err = create_diff(s);
5720 			if (s->first_displayed_line + view->nlines - 1 >
5721 			    s->nlines) {
5722 				s->first_displayed_line = 1;
5723 				s->last_displayed_line = view->nlines;
5724 			}
5725 		} else
5726 			view->count = 0;
5727 		break;
5728 	case ']':
5729 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5730 			s->diff_context++;
5731 			s->matched_line = 0;
5732 			diff_view_indicate_progress(view);
5733 			err = create_diff(s);
5734 		} else
5735 			view->count = 0;
5736 		break;
5737 	case '<':
5738 	case ',':
5739 	case 'K':
5740 		up = 1;
5741 		/* FALL THROUGH */
5742 	case '>':
5743 	case '.':
5744 	case 'J':
5745 		if (s->parent_view == NULL) {
5746 			view->count = 0;
5747 			break;
5748 		}
5749 		s->parent_view->count = view->count;
5750 
5751 		if (s->parent_view->type == TOG_VIEW_LOG) {
5752 			ls = &s->parent_view->state.log;
5753 			old_selected_entry = ls->selected_entry;
5754 
5755 			err = input_log_view(NULL, s->parent_view,
5756 			    up ? KEY_UP : KEY_DOWN);
5757 			if (err)
5758 				break;
5759 			view->count = s->parent_view->count;
5760 
5761 			if (old_selected_entry == ls->selected_entry)
5762 				break;
5763 
5764 			err = set_selected_commit(s, ls->selected_entry);
5765 			if (err)
5766 				break;
5767 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5768 			struct tog_blame_view_state *bs;
5769 			struct got_object_id *id, *prev_id;
5770 
5771 			bs = &s->parent_view->state.blame;
5772 			prev_id = get_annotation_for_line(bs->blame.lines,
5773 			    bs->blame.nlines, bs->last_diffed_line);
5774 
5775 			err = input_blame_view(&view, s->parent_view,
5776 			    up ? KEY_UP : KEY_DOWN);
5777 			if (err)
5778 				break;
5779 			view->count = s->parent_view->count;
5780 
5781 			if (prev_id == NULL)
5782 				break;
5783 			id = get_selected_commit_id(bs->blame.lines,
5784 			    bs->blame.nlines, bs->first_displayed_line,
5785 			    bs->selected_line);
5786 			if (id == NULL)
5787 				break;
5788 
5789 			if (!got_object_id_cmp(prev_id, id))
5790 				break;
5791 
5792 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5793 			if (err)
5794 				break;
5795 		}
5796 		s->first_displayed_line = 1;
5797 		s->last_displayed_line = view->nlines;
5798 		s->matched_line = 0;
5799 		view->x = 0;
5800 
5801 		diff_view_indicate_progress(view);
5802 		err = create_diff(s);
5803 		break;
5804 	default:
5805 		view->count = 0;
5806 		break;
5807 	}
5808 
5809 	return err;
5810 }
5811 
5812 static const struct got_error *
5813 cmd_diff(int argc, char *argv[])
5814 {
5815 	const struct got_error *error;
5816 	struct got_repository *repo = NULL;
5817 	struct got_worktree *worktree = NULL;
5818 	struct got_object_id *id1 = NULL, *id2 = NULL;
5819 	char *repo_path = NULL, *cwd = NULL;
5820 	char *id_str1 = NULL, *id_str2 = NULL;
5821 	char *label1 = NULL, *label2 = NULL;
5822 	int diff_context = 3, ignore_whitespace = 0;
5823 	int ch, force_text_diff = 0;
5824 	const char *errstr;
5825 	struct tog_view *view;
5826 	int *pack_fds = NULL;
5827 
5828 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5829 		switch (ch) {
5830 		case 'a':
5831 			force_text_diff = 1;
5832 			break;
5833 		case 'C':
5834 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5835 			    &errstr);
5836 			if (errstr != NULL)
5837 				errx(1, "number of context lines is %s: %s",
5838 				    errstr, errstr);
5839 			break;
5840 		case 'r':
5841 			repo_path = realpath(optarg, NULL);
5842 			if (repo_path == NULL)
5843 				return got_error_from_errno2("realpath",
5844 				    optarg);
5845 			got_path_strip_trailing_slashes(repo_path);
5846 			break;
5847 		case 'w':
5848 			ignore_whitespace = 1;
5849 			break;
5850 		default:
5851 			usage_diff();
5852 			/* NOTREACHED */
5853 		}
5854 	}
5855 
5856 	argc -= optind;
5857 	argv += optind;
5858 
5859 	if (argc == 0) {
5860 		usage_diff(); /* TODO show local worktree changes */
5861 	} else if (argc == 2) {
5862 		id_str1 = argv[0];
5863 		id_str2 = argv[1];
5864 	} else
5865 		usage_diff();
5866 
5867 	error = got_repo_pack_fds_open(&pack_fds);
5868 	if (error)
5869 		goto done;
5870 
5871 	if (repo_path == NULL) {
5872 		cwd = getcwd(NULL, 0);
5873 		if (cwd == NULL)
5874 			return got_error_from_errno("getcwd");
5875 		error = got_worktree_open(&worktree, cwd);
5876 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5877 			goto done;
5878 		if (worktree)
5879 			repo_path =
5880 			    strdup(got_worktree_get_repo_path(worktree));
5881 		else
5882 			repo_path = strdup(cwd);
5883 		if (repo_path == NULL) {
5884 			error = got_error_from_errno("strdup");
5885 			goto done;
5886 		}
5887 	}
5888 
5889 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5890 	if (error)
5891 		goto done;
5892 
5893 	init_curses();
5894 
5895 	error = apply_unveil(got_repo_get_path(repo), NULL);
5896 	if (error)
5897 		goto done;
5898 
5899 	error = tog_load_refs(repo, 0);
5900 	if (error)
5901 		goto done;
5902 
5903 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5904 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5905 	if (error)
5906 		goto done;
5907 
5908 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5909 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5910 	if (error)
5911 		goto done;
5912 
5913 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5914 	if (view == NULL) {
5915 		error = got_error_from_errno("view_open");
5916 		goto done;
5917 	}
5918 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5919 	    ignore_whitespace, force_text_diff, NULL,  repo);
5920 	if (error)
5921 		goto done;
5922 	error = view_loop(view);
5923 done:
5924 	free(label1);
5925 	free(label2);
5926 	free(repo_path);
5927 	free(cwd);
5928 	if (repo) {
5929 		const struct got_error *close_err = got_repo_close(repo);
5930 		if (error == NULL)
5931 			error = close_err;
5932 	}
5933 	if (worktree)
5934 		got_worktree_close(worktree);
5935 	if (pack_fds) {
5936 		const struct got_error *pack_err =
5937 		    got_repo_pack_fds_close(pack_fds);
5938 		if (error == NULL)
5939 			error = pack_err;
5940 	}
5941 	tog_free_refs();
5942 	return error;
5943 }
5944 
5945 __dead static void
5946 usage_blame(void)
5947 {
5948 	endwin();
5949 	fprintf(stderr,
5950 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5951 	    getprogname());
5952 	exit(1);
5953 }
5954 
5955 struct tog_blame_line {
5956 	int annotated;
5957 	struct got_object_id *id;
5958 };
5959 
5960 static const struct got_error *
5961 draw_blame(struct tog_view *view)
5962 {
5963 	struct tog_blame_view_state *s = &view->state.blame;
5964 	struct tog_blame *blame = &s->blame;
5965 	regmatch_t *regmatch = &view->regmatch;
5966 	const struct got_error *err;
5967 	int lineno = 0, nprinted = 0;
5968 	char *line = NULL;
5969 	size_t linesize = 0;
5970 	ssize_t linelen;
5971 	wchar_t *wline;
5972 	int width;
5973 	struct tog_blame_line *blame_line;
5974 	struct got_object_id *prev_id = NULL;
5975 	char *id_str;
5976 	struct tog_color *tc;
5977 
5978 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5979 	if (err)
5980 		return err;
5981 
5982 	rewind(blame->f);
5983 	werase(view->window);
5984 
5985 	if (asprintf(&line, "commit %s", id_str) == -1) {
5986 		err = got_error_from_errno("asprintf");
5987 		free(id_str);
5988 		return err;
5989 	}
5990 
5991 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5992 	free(line);
5993 	line = NULL;
5994 	if (err)
5995 		return err;
5996 	if (view_needs_focus_indication(view))
5997 		wstandout(view->window);
5998 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5999 	if (tc)
6000 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6001 	waddwstr(view->window, wline);
6002 	while (width++ < view->ncols)
6003 		waddch(view->window, ' ');
6004 	if (tc)
6005 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6006 	if (view_needs_focus_indication(view))
6007 		wstandend(view->window);
6008 	free(wline);
6009 	wline = NULL;
6010 
6011 	if (view->gline > blame->nlines)
6012 		view->gline = blame->nlines;
6013 
6014 	if (tog_io.wait_for_ui) {
6015 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6016 		int rc;
6017 
6018 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6019 		if (rc)
6020 			return got_error_set_errno(rc, "pthread_cond_wait");
6021 		tog_io.wait_for_ui = 0;
6022 	}
6023 
6024 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6025 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6026 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6027 		free(id_str);
6028 		return got_error_from_errno("asprintf");
6029 	}
6030 	free(id_str);
6031 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6032 	free(line);
6033 	line = NULL;
6034 	if (err)
6035 		return err;
6036 	waddwstr(view->window, wline);
6037 	free(wline);
6038 	wline = NULL;
6039 	if (width < view->ncols - 1)
6040 		waddch(view->window, '\n');
6041 
6042 	s->eof = 0;
6043 	view->maxx = 0;
6044 	while (nprinted < view->nlines - 2) {
6045 		linelen = getline(&line, &linesize, blame->f);
6046 		if (linelen == -1) {
6047 			if (feof(blame->f)) {
6048 				s->eof = 1;
6049 				break;
6050 			}
6051 			free(line);
6052 			return got_ferror(blame->f, GOT_ERR_IO);
6053 		}
6054 		if (++lineno < s->first_displayed_line)
6055 			continue;
6056 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6057 			continue;
6058 
6059 		/* Set view->maxx based on full line length. */
6060 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6061 		if (err) {
6062 			free(line);
6063 			return err;
6064 		}
6065 		free(wline);
6066 		wline = NULL;
6067 		view->maxx = MAX(view->maxx, width);
6068 
6069 		if (nprinted == s->selected_line - 1)
6070 			wstandout(view->window);
6071 
6072 		if (blame->nlines > 0) {
6073 			blame_line = &blame->lines[lineno - 1];
6074 			if (blame_line->annotated && prev_id &&
6075 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6076 			    !(nprinted == s->selected_line - 1)) {
6077 				waddstr(view->window, "        ");
6078 			} else if (blame_line->annotated) {
6079 				char *id_str;
6080 				err = got_object_id_str(&id_str,
6081 				    blame_line->id);
6082 				if (err) {
6083 					free(line);
6084 					return err;
6085 				}
6086 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6087 				if (tc)
6088 					wattr_on(view->window,
6089 					    COLOR_PAIR(tc->colorpair), NULL);
6090 				wprintw(view->window, "%.8s", id_str);
6091 				if (tc)
6092 					wattr_off(view->window,
6093 					    COLOR_PAIR(tc->colorpair), NULL);
6094 				free(id_str);
6095 				prev_id = blame_line->id;
6096 			} else {
6097 				waddstr(view->window, "........");
6098 				prev_id = NULL;
6099 			}
6100 		} else {
6101 			waddstr(view->window, "........");
6102 			prev_id = NULL;
6103 		}
6104 
6105 		if (nprinted == s->selected_line - 1)
6106 			wstandend(view->window);
6107 		waddstr(view->window, " ");
6108 
6109 		if (view->ncols <= 9) {
6110 			width = 9;
6111 		} else if (s->first_displayed_line + nprinted ==
6112 		    s->matched_line &&
6113 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6114 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6115 			    view->window, view->x, regmatch);
6116 			if (err) {
6117 				free(line);
6118 				return err;
6119 			}
6120 			width += 9;
6121 		} else {
6122 			int skip;
6123 			err = format_line(&wline, &width, &skip, line,
6124 			    view->x, view->ncols - 9, 9, 1);
6125 			if (err) {
6126 				free(line);
6127 				return err;
6128 			}
6129 			waddwstr(view->window, &wline[skip]);
6130 			width += 9;
6131 			free(wline);
6132 			wline = NULL;
6133 		}
6134 
6135 		if (width <= view->ncols - 1)
6136 			waddch(view->window, '\n');
6137 		if (++nprinted == 1)
6138 			s->first_displayed_line = lineno;
6139 	}
6140 	free(line);
6141 	s->last_displayed_line = lineno;
6142 
6143 	view_border(view);
6144 
6145 	return NULL;
6146 }
6147 
6148 static const struct got_error *
6149 blame_cb(void *arg, int nlines, int lineno,
6150     struct got_commit_object *commit, struct got_object_id *id)
6151 {
6152 	const struct got_error *err = NULL;
6153 	struct tog_blame_cb_args *a = arg;
6154 	struct tog_blame_line *line;
6155 	int errcode;
6156 
6157 	if (nlines != a->nlines ||
6158 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6159 		return got_error(GOT_ERR_RANGE);
6160 
6161 	errcode = pthread_mutex_lock(&tog_mutex);
6162 	if (errcode)
6163 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6164 
6165 	if (*a->quit) {	/* user has quit the blame view */
6166 		err = got_error(GOT_ERR_ITER_COMPLETED);
6167 		goto done;
6168 	}
6169 
6170 	if (lineno == -1)
6171 		goto done; /* no change in this commit */
6172 
6173 	line = &a->lines[lineno - 1];
6174 	if (line->annotated)
6175 		goto done;
6176 
6177 	line->id = got_object_id_dup(id);
6178 	if (line->id == NULL) {
6179 		err = got_error_from_errno("got_object_id_dup");
6180 		goto done;
6181 	}
6182 	line->annotated = 1;
6183 done:
6184 	errcode = pthread_mutex_unlock(&tog_mutex);
6185 	if (errcode)
6186 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6187 	return err;
6188 }
6189 
6190 static void *
6191 blame_thread(void *arg)
6192 {
6193 	const struct got_error *err, *close_err;
6194 	struct tog_blame_thread_args *ta = arg;
6195 	struct tog_blame_cb_args *a = ta->cb_args;
6196 	int errcode, fd1 = -1, fd2 = -1;
6197 	FILE *f1 = NULL, *f2 = NULL;
6198 
6199 	fd1 = got_opentempfd();
6200 	if (fd1 == -1)
6201 		return (void *)got_error_from_errno("got_opentempfd");
6202 
6203 	fd2 = got_opentempfd();
6204 	if (fd2 == -1) {
6205 		err = got_error_from_errno("got_opentempfd");
6206 		goto done;
6207 	}
6208 
6209 	f1 = got_opentemp();
6210 	if (f1 == NULL) {
6211 		err = (void *)got_error_from_errno("got_opentemp");
6212 		goto done;
6213 	}
6214 	f2 = got_opentemp();
6215 	if (f2 == NULL) {
6216 		err = (void *)got_error_from_errno("got_opentemp");
6217 		goto done;
6218 	}
6219 
6220 	err = block_signals_used_by_main_thread();
6221 	if (err)
6222 		goto done;
6223 
6224 	err = got_blame(ta->path, a->commit_id, ta->repo,
6225 	    tog_diff_algo, blame_cb, ta->cb_args,
6226 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6227 	if (err && err->code == GOT_ERR_CANCELLED)
6228 		err = NULL;
6229 
6230 	errcode = pthread_mutex_lock(&tog_mutex);
6231 	if (errcode) {
6232 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6233 		goto done;
6234 	}
6235 
6236 	close_err = got_repo_close(ta->repo);
6237 	if (err == NULL)
6238 		err = close_err;
6239 	ta->repo = NULL;
6240 	*ta->complete = 1;
6241 
6242 	if (tog_io.wait_for_ui) {
6243 		errcode = pthread_cond_signal(&ta->blame_complete);
6244 		if (errcode && err == NULL)
6245 			err = got_error_set_errno(errcode,
6246 			    "pthread_cond_signal");
6247 	}
6248 
6249 	errcode = pthread_mutex_unlock(&tog_mutex);
6250 	if (errcode && err == NULL)
6251 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6252 
6253 done:
6254 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6255 		err = got_error_from_errno("close");
6256 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6257 		err = got_error_from_errno("close");
6258 	if (f1 && fclose(f1) == EOF && err == NULL)
6259 		err = got_error_from_errno("fclose");
6260 	if (f2 && fclose(f2) == EOF && err == NULL)
6261 		err = got_error_from_errno("fclose");
6262 
6263 	return (void *)err;
6264 }
6265 
6266 static struct got_object_id *
6267 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6268     int first_displayed_line, int selected_line)
6269 {
6270 	struct tog_blame_line *line;
6271 
6272 	if (nlines <= 0)
6273 		return NULL;
6274 
6275 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6276 	if (!line->annotated)
6277 		return NULL;
6278 
6279 	return line->id;
6280 }
6281 
6282 static struct got_object_id *
6283 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6284     int lineno)
6285 {
6286 	struct tog_blame_line *line;
6287 
6288 	if (nlines <= 0 || lineno >= nlines)
6289 		return NULL;
6290 
6291 	line = &lines[lineno - 1];
6292 	if (!line->annotated)
6293 		return NULL;
6294 
6295 	return line->id;
6296 }
6297 
6298 static const struct got_error *
6299 stop_blame(struct tog_blame *blame)
6300 {
6301 	const struct got_error *err = NULL;
6302 	int i;
6303 
6304 	if (blame->thread) {
6305 		int errcode;
6306 		errcode = pthread_mutex_unlock(&tog_mutex);
6307 		if (errcode)
6308 			return got_error_set_errno(errcode,
6309 			    "pthread_mutex_unlock");
6310 		errcode = pthread_join(blame->thread, (void **)&err);
6311 		if (errcode)
6312 			return got_error_set_errno(errcode, "pthread_join");
6313 		errcode = pthread_mutex_lock(&tog_mutex);
6314 		if (errcode)
6315 			return got_error_set_errno(errcode,
6316 			    "pthread_mutex_lock");
6317 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6318 			err = NULL;
6319 		blame->thread = NULL;
6320 	}
6321 	if (blame->thread_args.repo) {
6322 		const struct got_error *close_err;
6323 		close_err = got_repo_close(blame->thread_args.repo);
6324 		if (err == NULL)
6325 			err = close_err;
6326 		blame->thread_args.repo = NULL;
6327 	}
6328 	if (blame->f) {
6329 		if (fclose(blame->f) == EOF && err == NULL)
6330 			err = got_error_from_errno("fclose");
6331 		blame->f = NULL;
6332 	}
6333 	if (blame->lines) {
6334 		for (i = 0; i < blame->nlines; i++)
6335 			free(blame->lines[i].id);
6336 		free(blame->lines);
6337 		blame->lines = NULL;
6338 	}
6339 	free(blame->cb_args.commit_id);
6340 	blame->cb_args.commit_id = NULL;
6341 	if (blame->pack_fds) {
6342 		const struct got_error *pack_err =
6343 		    got_repo_pack_fds_close(blame->pack_fds);
6344 		if (err == NULL)
6345 			err = pack_err;
6346 		blame->pack_fds = NULL;
6347 	}
6348 	return err;
6349 }
6350 
6351 static const struct got_error *
6352 cancel_blame_view(void *arg)
6353 {
6354 	const struct got_error *err = NULL;
6355 	int *done = arg;
6356 	int errcode;
6357 
6358 	errcode = pthread_mutex_lock(&tog_mutex);
6359 	if (errcode)
6360 		return got_error_set_errno(errcode,
6361 		    "pthread_mutex_unlock");
6362 
6363 	if (*done)
6364 		err = got_error(GOT_ERR_CANCELLED);
6365 
6366 	errcode = pthread_mutex_unlock(&tog_mutex);
6367 	if (errcode)
6368 		return got_error_set_errno(errcode,
6369 		    "pthread_mutex_lock");
6370 
6371 	return err;
6372 }
6373 
6374 static const struct got_error *
6375 run_blame(struct tog_view *view)
6376 {
6377 	struct tog_blame_view_state *s = &view->state.blame;
6378 	struct tog_blame *blame = &s->blame;
6379 	const struct got_error *err = NULL;
6380 	struct got_commit_object *commit = NULL;
6381 	struct got_blob_object *blob = NULL;
6382 	struct got_repository *thread_repo = NULL;
6383 	struct got_object_id *obj_id = NULL;
6384 	int obj_type, fd = -1;
6385 	int *pack_fds = NULL;
6386 
6387 	err = got_object_open_as_commit(&commit, s->repo,
6388 	    &s->blamed_commit->id);
6389 	if (err)
6390 		return err;
6391 
6392 	fd = got_opentempfd();
6393 	if (fd == -1) {
6394 		err = got_error_from_errno("got_opentempfd");
6395 		goto done;
6396 	}
6397 
6398 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6399 	if (err)
6400 		goto done;
6401 
6402 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6403 	if (err)
6404 		goto done;
6405 
6406 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6407 		err = got_error(GOT_ERR_OBJ_TYPE);
6408 		goto done;
6409 	}
6410 
6411 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6412 	if (err)
6413 		goto done;
6414 	blame->f = got_opentemp();
6415 	if (blame->f == NULL) {
6416 		err = got_error_from_errno("got_opentemp");
6417 		goto done;
6418 	}
6419 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6420 	    &blame->line_offsets, blame->f, blob);
6421 	if (err)
6422 		goto done;
6423 	if (blame->nlines == 0) {
6424 		s->blame_complete = 1;
6425 		goto done;
6426 	}
6427 
6428 	/* Don't include \n at EOF in the blame line count. */
6429 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6430 		blame->nlines--;
6431 
6432 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6433 	if (blame->lines == NULL) {
6434 		err = got_error_from_errno("calloc");
6435 		goto done;
6436 	}
6437 
6438 	err = got_repo_pack_fds_open(&pack_fds);
6439 	if (err)
6440 		goto done;
6441 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6442 	    pack_fds);
6443 	if (err)
6444 		goto done;
6445 
6446 	blame->pack_fds = pack_fds;
6447 	blame->cb_args.view = view;
6448 	blame->cb_args.lines = blame->lines;
6449 	blame->cb_args.nlines = blame->nlines;
6450 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6451 	if (blame->cb_args.commit_id == NULL) {
6452 		err = got_error_from_errno("got_object_id_dup");
6453 		goto done;
6454 	}
6455 	blame->cb_args.quit = &s->done;
6456 
6457 	blame->thread_args.path = s->path;
6458 	blame->thread_args.repo = thread_repo;
6459 	blame->thread_args.cb_args = &blame->cb_args;
6460 	blame->thread_args.complete = &s->blame_complete;
6461 	blame->thread_args.cancel_cb = cancel_blame_view;
6462 	blame->thread_args.cancel_arg = &s->done;
6463 	s->blame_complete = 0;
6464 
6465 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6466 		s->first_displayed_line = 1;
6467 		s->last_displayed_line = view->nlines;
6468 		s->selected_line = 1;
6469 	}
6470 	s->matched_line = 0;
6471 
6472 done:
6473 	if (commit)
6474 		got_object_commit_close(commit);
6475 	if (fd != -1 && close(fd) == -1 && err == NULL)
6476 		err = got_error_from_errno("close");
6477 	if (blob)
6478 		got_object_blob_close(blob);
6479 	free(obj_id);
6480 	if (err)
6481 		stop_blame(blame);
6482 	return err;
6483 }
6484 
6485 static const struct got_error *
6486 open_blame_view(struct tog_view *view, char *path,
6487     struct got_object_id *commit_id, struct got_repository *repo)
6488 {
6489 	const struct got_error *err = NULL;
6490 	struct tog_blame_view_state *s = &view->state.blame;
6491 
6492 	STAILQ_INIT(&s->blamed_commits);
6493 
6494 	s->path = strdup(path);
6495 	if (s->path == NULL)
6496 		return got_error_from_errno("strdup");
6497 
6498 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6499 	if (err) {
6500 		free(s->path);
6501 		return err;
6502 	}
6503 
6504 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6505 	s->first_displayed_line = 1;
6506 	s->last_displayed_line = view->nlines;
6507 	s->selected_line = 1;
6508 	s->blame_complete = 0;
6509 	s->repo = repo;
6510 	s->commit_id = commit_id;
6511 	memset(&s->blame, 0, sizeof(s->blame));
6512 
6513 	STAILQ_INIT(&s->colors);
6514 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6515 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6516 		    get_color_value("TOG_COLOR_COMMIT"));
6517 		if (err)
6518 			return err;
6519 	}
6520 
6521 	view->show = show_blame_view;
6522 	view->input = input_blame_view;
6523 	view->reset = reset_blame_view;
6524 	view->close = close_blame_view;
6525 	view->search_start = search_start_blame_view;
6526 	view->search_setup = search_setup_blame_view;
6527 	view->search_next = search_next_view_match;
6528 
6529 	if (using_mock_io) {
6530 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6531 		int rc;
6532 
6533 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6534 		if (rc)
6535 			return got_error_set_errno(rc, "pthread_cond_init");
6536 	}
6537 
6538 	return run_blame(view);
6539 }
6540 
6541 static const struct got_error *
6542 close_blame_view(struct tog_view *view)
6543 {
6544 	const struct got_error *err = NULL;
6545 	struct tog_blame_view_state *s = &view->state.blame;
6546 
6547 	if (s->blame.thread)
6548 		err = stop_blame(&s->blame);
6549 
6550 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6551 		struct got_object_qid *blamed_commit;
6552 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6553 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6554 		got_object_qid_free(blamed_commit);
6555 	}
6556 
6557 	if (using_mock_io) {
6558 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6559 		int rc;
6560 
6561 		rc = pthread_cond_destroy(&bta->blame_complete);
6562 		if (rc && err == NULL)
6563 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6564 	}
6565 
6566 	free(s->path);
6567 	free_colors(&s->colors);
6568 	return err;
6569 }
6570 
6571 static const struct got_error *
6572 search_start_blame_view(struct tog_view *view)
6573 {
6574 	struct tog_blame_view_state *s = &view->state.blame;
6575 
6576 	s->matched_line = 0;
6577 	return NULL;
6578 }
6579 
6580 static void
6581 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6582     size_t *nlines, int **first, int **last, int **match, int **selected)
6583 {
6584 	struct tog_blame_view_state *s = &view->state.blame;
6585 
6586 	*f = s->blame.f;
6587 	*nlines = s->blame.nlines;
6588 	*line_offsets = s->blame.line_offsets;
6589 	*match = &s->matched_line;
6590 	*first = &s->first_displayed_line;
6591 	*last = &s->last_displayed_line;
6592 	*selected = &s->selected_line;
6593 }
6594 
6595 static const struct got_error *
6596 show_blame_view(struct tog_view *view)
6597 {
6598 	const struct got_error *err = NULL;
6599 	struct tog_blame_view_state *s = &view->state.blame;
6600 	int errcode;
6601 
6602 	if (s->blame.thread == NULL && !s->blame_complete) {
6603 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6604 		    &s->blame.thread_args);
6605 		if (errcode)
6606 			return got_error_set_errno(errcode, "pthread_create");
6607 
6608 		if (!using_mock_io)
6609 			halfdelay(1); /* fast refresh while annotating  */
6610 	}
6611 
6612 	if (s->blame_complete && !using_mock_io)
6613 		halfdelay(10); /* disable fast refresh */
6614 
6615 	err = draw_blame(view);
6616 
6617 	view_border(view);
6618 	return err;
6619 }
6620 
6621 static const struct got_error *
6622 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6623     struct got_repository *repo, struct got_object_id *id)
6624 {
6625 	struct tog_view		*log_view;
6626 	const struct got_error	*err = NULL;
6627 
6628 	*new_view = NULL;
6629 
6630 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6631 	if (log_view == NULL)
6632 		return got_error_from_errno("view_open");
6633 
6634 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6635 	if (err)
6636 		view_close(log_view);
6637 	else
6638 		*new_view = log_view;
6639 
6640 	return err;
6641 }
6642 
6643 static const struct got_error *
6644 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6645 {
6646 	const struct got_error *err = NULL, *thread_err = NULL;
6647 	struct tog_view *diff_view;
6648 	struct tog_blame_view_state *s = &view->state.blame;
6649 	int eos, nscroll, begin_y = 0, begin_x = 0;
6650 
6651 	eos = nscroll = view->nlines - 2;
6652 	if (view_is_hsplit_top(view))
6653 		--eos;  /* border */
6654 
6655 	switch (ch) {
6656 	case '0':
6657 	case '$':
6658 	case KEY_RIGHT:
6659 	case 'l':
6660 	case KEY_LEFT:
6661 	case 'h':
6662 		horizontal_scroll_input(view, ch);
6663 		break;
6664 	case 'q':
6665 		s->done = 1;
6666 		break;
6667 	case 'g':
6668 	case KEY_HOME:
6669 		s->selected_line = 1;
6670 		s->first_displayed_line = 1;
6671 		view->count = 0;
6672 		break;
6673 	case 'G':
6674 	case KEY_END:
6675 		if (s->blame.nlines < eos) {
6676 			s->selected_line = s->blame.nlines;
6677 			s->first_displayed_line = 1;
6678 		} else {
6679 			s->selected_line = eos;
6680 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6681 		}
6682 		view->count = 0;
6683 		break;
6684 	case 'k':
6685 	case KEY_UP:
6686 	case CTRL('p'):
6687 		if (s->selected_line > 1)
6688 			s->selected_line--;
6689 		else if (s->selected_line == 1 &&
6690 		    s->first_displayed_line > 1)
6691 			s->first_displayed_line--;
6692 		else
6693 			view->count = 0;
6694 		break;
6695 	case CTRL('u'):
6696 	case 'u':
6697 		nscroll /= 2;
6698 		/* FALL THROUGH */
6699 	case KEY_PPAGE:
6700 	case CTRL('b'):
6701 	case 'b':
6702 		if (s->first_displayed_line == 1) {
6703 			if (view->count > 1)
6704 				nscroll += nscroll;
6705 			s->selected_line = MAX(1, s->selected_line - nscroll);
6706 			view->count = 0;
6707 			break;
6708 		}
6709 		if (s->first_displayed_line > nscroll)
6710 			s->first_displayed_line -= nscroll;
6711 		else
6712 			s->first_displayed_line = 1;
6713 		break;
6714 	case 'j':
6715 	case KEY_DOWN:
6716 	case CTRL('n'):
6717 		if (s->selected_line < eos && s->first_displayed_line +
6718 		    s->selected_line <= s->blame.nlines)
6719 			s->selected_line++;
6720 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6721 			s->first_displayed_line++;
6722 		else
6723 			view->count = 0;
6724 		break;
6725 	case 'c':
6726 	case 'p': {
6727 		struct got_object_id *id = NULL;
6728 
6729 		view->count = 0;
6730 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6731 		    s->first_displayed_line, s->selected_line);
6732 		if (id == NULL)
6733 			break;
6734 		if (ch == 'p') {
6735 			struct got_commit_object *commit, *pcommit;
6736 			struct got_object_qid *pid;
6737 			struct got_object_id *blob_id = NULL;
6738 			int obj_type;
6739 			err = got_object_open_as_commit(&commit,
6740 			    s->repo, id);
6741 			if (err)
6742 				break;
6743 			pid = STAILQ_FIRST(
6744 			    got_object_commit_get_parent_ids(commit));
6745 			if (pid == NULL) {
6746 				got_object_commit_close(commit);
6747 				break;
6748 			}
6749 			/* Check if path history ends here. */
6750 			err = got_object_open_as_commit(&pcommit,
6751 			    s->repo, &pid->id);
6752 			if (err)
6753 				break;
6754 			err = got_object_id_by_path(&blob_id, s->repo,
6755 			    pcommit, s->path);
6756 			got_object_commit_close(pcommit);
6757 			if (err) {
6758 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6759 					err = NULL;
6760 				got_object_commit_close(commit);
6761 				break;
6762 			}
6763 			err = got_object_get_type(&obj_type, s->repo,
6764 			    blob_id);
6765 			free(blob_id);
6766 			/* Can't blame non-blob type objects. */
6767 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6768 				got_object_commit_close(commit);
6769 				break;
6770 			}
6771 			err = got_object_qid_alloc(&s->blamed_commit,
6772 			    &pid->id);
6773 			got_object_commit_close(commit);
6774 		} else {
6775 			if (got_object_id_cmp(id,
6776 			    &s->blamed_commit->id) == 0)
6777 				break;
6778 			err = got_object_qid_alloc(&s->blamed_commit,
6779 			    id);
6780 		}
6781 		if (err)
6782 			break;
6783 		s->done = 1;
6784 		thread_err = stop_blame(&s->blame);
6785 		s->done = 0;
6786 		if (thread_err)
6787 			break;
6788 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6789 		    s->blamed_commit, entry);
6790 		err = run_blame(view);
6791 		if (err)
6792 			break;
6793 		break;
6794 	}
6795 	case 'C': {
6796 		struct got_object_qid *first;
6797 
6798 		view->count = 0;
6799 		first = STAILQ_FIRST(&s->blamed_commits);
6800 		if (!got_object_id_cmp(&first->id, s->commit_id))
6801 			break;
6802 		s->done = 1;
6803 		thread_err = stop_blame(&s->blame);
6804 		s->done = 0;
6805 		if (thread_err)
6806 			break;
6807 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6808 		got_object_qid_free(s->blamed_commit);
6809 		s->blamed_commit =
6810 		    STAILQ_FIRST(&s->blamed_commits);
6811 		err = run_blame(view);
6812 		if (err)
6813 			break;
6814 		break;
6815 	}
6816 	case 'L':
6817 		view->count = 0;
6818 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6819 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6820 		if (s->id_to_log)
6821 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6822 		break;
6823 	case KEY_ENTER:
6824 	case '\r': {
6825 		struct got_object_id *id = NULL;
6826 		struct got_object_qid *pid;
6827 		struct got_commit_object *commit = NULL;
6828 
6829 		view->count = 0;
6830 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6831 		    s->first_displayed_line, s->selected_line);
6832 		if (id == NULL)
6833 			break;
6834 		err = got_object_open_as_commit(&commit, s->repo, id);
6835 		if (err)
6836 			break;
6837 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6838 		if (*new_view) {
6839 			/* traversed from diff view, release diff resources  */
6840 			err = close_diff_view(*new_view);
6841 			if (err)
6842 				break;
6843 			diff_view = *new_view;
6844 		} else {
6845 			if (view_is_parent_view(view))
6846 				view_get_split(view, &begin_y, &begin_x);
6847 
6848 			diff_view = view_open(0, 0, begin_y, begin_x,
6849 			    TOG_VIEW_DIFF);
6850 			if (diff_view == NULL) {
6851 				got_object_commit_close(commit);
6852 				err = got_error_from_errno("view_open");
6853 				break;
6854 			}
6855 		}
6856 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6857 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6858 		got_object_commit_close(commit);
6859 		if (err) {
6860 			view_close(diff_view);
6861 			break;
6862 		}
6863 		s->last_diffed_line = s->first_displayed_line - 1 +
6864 		    s->selected_line;
6865 		if (*new_view)
6866 			break;	/* still open from active diff view */
6867 		if (view_is_parent_view(view) &&
6868 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6869 			err = view_init_hsplit(view, begin_y);
6870 			if (err)
6871 				break;
6872 		}
6873 
6874 		view->focussed = 0;
6875 		diff_view->focussed = 1;
6876 		diff_view->mode = view->mode;
6877 		diff_view->nlines = view->lines - begin_y;
6878 		if (view_is_parent_view(view)) {
6879 			view_transfer_size(diff_view, view);
6880 			err = view_close_child(view);
6881 			if (err)
6882 				break;
6883 			err = view_set_child(view, diff_view);
6884 			if (err)
6885 				break;
6886 			view->focus_child = 1;
6887 		} else
6888 			*new_view = diff_view;
6889 		if (err)
6890 			break;
6891 		break;
6892 	}
6893 	case CTRL('d'):
6894 	case 'd':
6895 		nscroll /= 2;
6896 		/* FALL THROUGH */
6897 	case KEY_NPAGE:
6898 	case CTRL('f'):
6899 	case 'f':
6900 	case ' ':
6901 		if (s->last_displayed_line >= s->blame.nlines &&
6902 		    s->selected_line >= MIN(s->blame.nlines,
6903 		    view->nlines - 2)) {
6904 			view->count = 0;
6905 			break;
6906 		}
6907 		if (s->last_displayed_line >= s->blame.nlines &&
6908 		    s->selected_line < view->nlines - 2) {
6909 			s->selected_line +=
6910 			    MIN(nscroll, s->last_displayed_line -
6911 			    s->first_displayed_line - s->selected_line + 1);
6912 		}
6913 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6914 			s->first_displayed_line += nscroll;
6915 		else
6916 			s->first_displayed_line =
6917 			    s->blame.nlines - (view->nlines - 3);
6918 		break;
6919 	case KEY_RESIZE:
6920 		if (s->selected_line > view->nlines - 2) {
6921 			s->selected_line = MIN(s->blame.nlines,
6922 			    view->nlines - 2);
6923 		}
6924 		break;
6925 	default:
6926 		view->count = 0;
6927 		break;
6928 	}
6929 	return thread_err ? thread_err : err;
6930 }
6931 
6932 static const struct got_error *
6933 reset_blame_view(struct tog_view *view)
6934 {
6935 	const struct got_error *err;
6936 	struct tog_blame_view_state *s = &view->state.blame;
6937 
6938 	view->count = 0;
6939 	s->done = 1;
6940 	err = stop_blame(&s->blame);
6941 	s->done = 0;
6942 	if (err)
6943 		return err;
6944 	return run_blame(view);
6945 }
6946 
6947 static const struct got_error *
6948 cmd_blame(int argc, char *argv[])
6949 {
6950 	const struct got_error *error;
6951 	struct got_repository *repo = NULL;
6952 	struct got_worktree *worktree = NULL;
6953 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6954 	char *link_target = NULL;
6955 	struct got_object_id *commit_id = NULL;
6956 	struct got_commit_object *commit = NULL;
6957 	char *commit_id_str = NULL;
6958 	int ch;
6959 	struct tog_view *view = NULL;
6960 	int *pack_fds = NULL;
6961 
6962 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6963 		switch (ch) {
6964 		case 'c':
6965 			commit_id_str = optarg;
6966 			break;
6967 		case 'r':
6968 			repo_path = realpath(optarg, NULL);
6969 			if (repo_path == NULL)
6970 				return got_error_from_errno2("realpath",
6971 				    optarg);
6972 			break;
6973 		default:
6974 			usage_blame();
6975 			/* NOTREACHED */
6976 		}
6977 	}
6978 
6979 	argc -= optind;
6980 	argv += optind;
6981 
6982 	if (argc != 1)
6983 		usage_blame();
6984 
6985 	error = got_repo_pack_fds_open(&pack_fds);
6986 	if (error != NULL)
6987 		goto done;
6988 
6989 	if (repo_path == NULL) {
6990 		cwd = getcwd(NULL, 0);
6991 		if (cwd == NULL)
6992 			return got_error_from_errno("getcwd");
6993 		error = got_worktree_open(&worktree, cwd);
6994 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6995 			goto done;
6996 		if (worktree)
6997 			repo_path =
6998 			    strdup(got_worktree_get_repo_path(worktree));
6999 		else
7000 			repo_path = strdup(cwd);
7001 		if (repo_path == NULL) {
7002 			error = got_error_from_errno("strdup");
7003 			goto done;
7004 		}
7005 	}
7006 
7007 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7008 	if (error != NULL)
7009 		goto done;
7010 
7011 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7012 	    worktree);
7013 	if (error)
7014 		goto done;
7015 
7016 	init_curses();
7017 
7018 	error = apply_unveil(got_repo_get_path(repo), NULL);
7019 	if (error)
7020 		goto done;
7021 
7022 	error = tog_load_refs(repo, 0);
7023 	if (error)
7024 		goto done;
7025 
7026 	if (commit_id_str == NULL) {
7027 		struct got_reference *head_ref;
7028 		error = got_ref_open(&head_ref, repo, worktree ?
7029 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7030 		if (error != NULL)
7031 			goto done;
7032 		error = got_ref_resolve(&commit_id, repo, head_ref);
7033 		got_ref_close(head_ref);
7034 	} else {
7035 		error = got_repo_match_object_id(&commit_id, NULL,
7036 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7037 	}
7038 	if (error != NULL)
7039 		goto done;
7040 
7041 	error = got_object_open_as_commit(&commit, repo, commit_id);
7042 	if (error)
7043 		goto done;
7044 
7045 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7046 	    commit, repo);
7047 	if (error)
7048 		goto done;
7049 
7050 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7051 	if (view == NULL) {
7052 		error = got_error_from_errno("view_open");
7053 		goto done;
7054 	}
7055 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7056 	    commit_id, repo);
7057 	if (error != NULL) {
7058 		if (view->close == NULL)
7059 			close_blame_view(view);
7060 		view_close(view);
7061 		goto done;
7062 	}
7063 	if (worktree) {
7064 		/* Release work tree lock. */
7065 		got_worktree_close(worktree);
7066 		worktree = NULL;
7067 	}
7068 	error = view_loop(view);
7069 done:
7070 	free(repo_path);
7071 	free(in_repo_path);
7072 	free(link_target);
7073 	free(cwd);
7074 	free(commit_id);
7075 	if (commit)
7076 		got_object_commit_close(commit);
7077 	if (worktree)
7078 		got_worktree_close(worktree);
7079 	if (repo) {
7080 		const struct got_error *close_err = got_repo_close(repo);
7081 		if (error == NULL)
7082 			error = close_err;
7083 	}
7084 	if (pack_fds) {
7085 		const struct got_error *pack_err =
7086 		    got_repo_pack_fds_close(pack_fds);
7087 		if (error == NULL)
7088 			error = pack_err;
7089 	}
7090 	tog_free_refs();
7091 	return error;
7092 }
7093 
7094 static const struct got_error *
7095 draw_tree_entries(struct tog_view *view, const char *parent_path)
7096 {
7097 	struct tog_tree_view_state *s = &view->state.tree;
7098 	const struct got_error *err = NULL;
7099 	struct got_tree_entry *te;
7100 	wchar_t *wline;
7101 	char *index = NULL;
7102 	struct tog_color *tc;
7103 	int width, n, nentries, scrollx, i = 1;
7104 	int limit = view->nlines;
7105 
7106 	s->ndisplayed = 0;
7107 	if (view_is_hsplit_top(view))
7108 		--limit;  /* border */
7109 
7110 	werase(view->window);
7111 
7112 	if (limit == 0)
7113 		return NULL;
7114 
7115 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7116 	    0, 0);
7117 	if (err)
7118 		return err;
7119 	if (view_needs_focus_indication(view))
7120 		wstandout(view->window);
7121 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7122 	if (tc)
7123 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7124 	waddwstr(view->window, wline);
7125 	free(wline);
7126 	wline = NULL;
7127 	while (width++ < view->ncols)
7128 		waddch(view->window, ' ');
7129 	if (tc)
7130 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7131 	if (view_needs_focus_indication(view))
7132 		wstandend(view->window);
7133 	if (--limit <= 0)
7134 		return NULL;
7135 
7136 	i += s->selected;
7137 	if (s->first_displayed_entry) {
7138 		i += got_tree_entry_get_index(s->first_displayed_entry);
7139 		if (s->tree != s->root)
7140 			++i;  /* account for ".." entry */
7141 	}
7142 	nentries = got_object_tree_get_nentries(s->tree);
7143 	if (asprintf(&index, "[%d/%d] %s",
7144 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7145 		return got_error_from_errno("asprintf");
7146 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7147 	free(index);
7148 	if (err)
7149 		return err;
7150 	waddwstr(view->window, wline);
7151 	free(wline);
7152 	wline = NULL;
7153 	if (width < view->ncols - 1)
7154 		waddch(view->window, '\n');
7155 	if (--limit <= 0)
7156 		return NULL;
7157 	waddch(view->window, '\n');
7158 	if (--limit <= 0)
7159 		return NULL;
7160 
7161 	if (s->first_displayed_entry == NULL) {
7162 		te = got_object_tree_get_first_entry(s->tree);
7163 		if (s->selected == 0) {
7164 			if (view->focussed)
7165 				wstandout(view->window);
7166 			s->selected_entry = NULL;
7167 		}
7168 		waddstr(view->window, "  ..\n");	/* parent directory */
7169 		if (s->selected == 0 && view->focussed)
7170 			wstandend(view->window);
7171 		s->ndisplayed++;
7172 		if (--limit <= 0)
7173 			return NULL;
7174 		n = 1;
7175 	} else {
7176 		n = 0;
7177 		te = s->first_displayed_entry;
7178 	}
7179 
7180 	view->maxx = 0;
7181 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7182 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7183 		const char *modestr = "";
7184 		mode_t mode;
7185 
7186 		te = got_object_tree_get_entry(s->tree, i);
7187 		mode = got_tree_entry_get_mode(te);
7188 
7189 		if (s->show_ids) {
7190 			err = got_object_id_str(&id_str,
7191 			    got_tree_entry_get_id(te));
7192 			if (err)
7193 				return got_error_from_errno(
7194 				    "got_object_id_str");
7195 		}
7196 		if (got_object_tree_entry_is_submodule(te))
7197 			modestr = "$";
7198 		else if (S_ISLNK(mode)) {
7199 			int i;
7200 
7201 			err = got_tree_entry_get_symlink_target(&link_target,
7202 			    te, s->repo);
7203 			if (err) {
7204 				free(id_str);
7205 				return err;
7206 			}
7207 			for (i = 0; i < strlen(link_target); i++) {
7208 				if (!isprint((unsigned char)link_target[i]))
7209 					link_target[i] = '?';
7210 			}
7211 			modestr = "@";
7212 		}
7213 		else if (S_ISDIR(mode))
7214 			modestr = "/";
7215 		else if (mode & S_IXUSR)
7216 			modestr = "*";
7217 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7218 		    got_tree_entry_get_name(te), modestr,
7219 		    link_target ? " -> ": "",
7220 		    link_target ? link_target : "") == -1) {
7221 			free(id_str);
7222 			free(link_target);
7223 			return got_error_from_errno("asprintf");
7224 		}
7225 		free(id_str);
7226 		free(link_target);
7227 
7228 		/* use full line width to determine view->maxx */
7229 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7230 		if (err) {
7231 			free(line);
7232 			break;
7233 		}
7234 		view->maxx = MAX(view->maxx, width);
7235 		free(wline);
7236 		wline = NULL;
7237 
7238 		err = format_line(&wline, &width, &scrollx, line, view->x,
7239 		    view->ncols, 0, 0);
7240 		if (err) {
7241 			free(line);
7242 			break;
7243 		}
7244 		if (n == s->selected) {
7245 			if (view->focussed)
7246 				wstandout(view->window);
7247 			s->selected_entry = te;
7248 		}
7249 		tc = match_color(&s->colors, line);
7250 		if (tc)
7251 			wattr_on(view->window,
7252 			    COLOR_PAIR(tc->colorpair), NULL);
7253 		waddwstr(view->window, &wline[scrollx]);
7254 		if (tc)
7255 			wattr_off(view->window,
7256 			    COLOR_PAIR(tc->colorpair), NULL);
7257 		if (width < view->ncols)
7258 			waddch(view->window, '\n');
7259 		if (n == s->selected && view->focussed)
7260 			wstandend(view->window);
7261 		free(line);
7262 		free(wline);
7263 		wline = NULL;
7264 		n++;
7265 		s->ndisplayed++;
7266 		s->last_displayed_entry = te;
7267 		if (--limit <= 0)
7268 			break;
7269 	}
7270 
7271 	return err;
7272 }
7273 
7274 static void
7275 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7276 {
7277 	struct got_tree_entry *te;
7278 	int isroot = s->tree == s->root;
7279 	int i = 0;
7280 
7281 	if (s->first_displayed_entry == NULL)
7282 		return;
7283 
7284 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7285 	while (i++ < maxscroll) {
7286 		if (te == NULL) {
7287 			if (!isroot)
7288 				s->first_displayed_entry = NULL;
7289 			break;
7290 		}
7291 		s->first_displayed_entry = te;
7292 		te = got_tree_entry_get_prev(s->tree, te);
7293 	}
7294 }
7295 
7296 static const struct got_error *
7297 tree_scroll_down(struct tog_view *view, int maxscroll)
7298 {
7299 	struct tog_tree_view_state *s = &view->state.tree;
7300 	struct got_tree_entry *next, *last;
7301 	int n = 0;
7302 
7303 	if (s->first_displayed_entry)
7304 		next = got_tree_entry_get_next(s->tree,
7305 		    s->first_displayed_entry);
7306 	else
7307 		next = got_object_tree_get_first_entry(s->tree);
7308 
7309 	last = s->last_displayed_entry;
7310 	while (next && n++ < maxscroll) {
7311 		if (last) {
7312 			s->last_displayed_entry = last;
7313 			last = got_tree_entry_get_next(s->tree, last);
7314 		}
7315 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7316 			s->first_displayed_entry = next;
7317 			next = got_tree_entry_get_next(s->tree, next);
7318 		}
7319 	}
7320 
7321 	return NULL;
7322 }
7323 
7324 static const struct got_error *
7325 tree_entry_path(char **path, struct tog_parent_trees *parents,
7326     struct got_tree_entry *te)
7327 {
7328 	const struct got_error *err = NULL;
7329 	struct tog_parent_tree *pt;
7330 	size_t len = 2; /* for leading slash and NUL */
7331 
7332 	TAILQ_FOREACH(pt, parents, entry)
7333 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7334 		    + 1 /* slash */;
7335 	if (te)
7336 		len += strlen(got_tree_entry_get_name(te));
7337 
7338 	*path = calloc(1, len);
7339 	if (path == NULL)
7340 		return got_error_from_errno("calloc");
7341 
7342 	(*path)[0] = '/';
7343 	pt = TAILQ_LAST(parents, tog_parent_trees);
7344 	while (pt) {
7345 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7346 		if (strlcat(*path, name, len) >= len) {
7347 			err = got_error(GOT_ERR_NO_SPACE);
7348 			goto done;
7349 		}
7350 		if (strlcat(*path, "/", len) >= len) {
7351 			err = got_error(GOT_ERR_NO_SPACE);
7352 			goto done;
7353 		}
7354 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7355 	}
7356 	if (te) {
7357 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7358 			err = got_error(GOT_ERR_NO_SPACE);
7359 			goto done;
7360 		}
7361 	}
7362 done:
7363 	if (err) {
7364 		free(*path);
7365 		*path = NULL;
7366 	}
7367 	return err;
7368 }
7369 
7370 static const struct got_error *
7371 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7372     struct got_tree_entry *te, struct tog_parent_trees *parents,
7373     struct got_object_id *commit_id, struct got_repository *repo)
7374 {
7375 	const struct got_error *err = NULL;
7376 	char *path;
7377 	struct tog_view *blame_view;
7378 
7379 	*new_view = NULL;
7380 
7381 	err = tree_entry_path(&path, parents, te);
7382 	if (err)
7383 		return err;
7384 
7385 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7386 	if (blame_view == NULL) {
7387 		err = got_error_from_errno("view_open");
7388 		goto done;
7389 	}
7390 
7391 	err = open_blame_view(blame_view, path, commit_id, repo);
7392 	if (err) {
7393 		if (err->code == GOT_ERR_CANCELLED)
7394 			err = NULL;
7395 		view_close(blame_view);
7396 	} else
7397 		*new_view = blame_view;
7398 done:
7399 	free(path);
7400 	return err;
7401 }
7402 
7403 static const struct got_error *
7404 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7405     struct tog_tree_view_state *s)
7406 {
7407 	struct tog_view *log_view;
7408 	const struct got_error *err = NULL;
7409 	char *path;
7410 
7411 	*new_view = NULL;
7412 
7413 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7414 	if (log_view == NULL)
7415 		return got_error_from_errno("view_open");
7416 
7417 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7418 	if (err)
7419 		return err;
7420 
7421 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7422 	    path, 0);
7423 	if (err)
7424 		view_close(log_view);
7425 	else
7426 		*new_view = log_view;
7427 	free(path);
7428 	return err;
7429 }
7430 
7431 static const struct got_error *
7432 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7433     const char *head_ref_name, struct got_repository *repo)
7434 {
7435 	const struct got_error *err = NULL;
7436 	char *commit_id_str = NULL;
7437 	struct tog_tree_view_state *s = &view->state.tree;
7438 	struct got_commit_object *commit = NULL;
7439 
7440 	TAILQ_INIT(&s->parents);
7441 	STAILQ_INIT(&s->colors);
7442 
7443 	s->commit_id = got_object_id_dup(commit_id);
7444 	if (s->commit_id == NULL) {
7445 		err = got_error_from_errno("got_object_id_dup");
7446 		goto done;
7447 	}
7448 
7449 	err = got_object_open_as_commit(&commit, repo, commit_id);
7450 	if (err)
7451 		goto done;
7452 
7453 	/*
7454 	 * The root is opened here and will be closed when the view is closed.
7455 	 * Any visited subtrees and their path-wise parents are opened and
7456 	 * closed on demand.
7457 	 */
7458 	err = got_object_open_as_tree(&s->root, repo,
7459 	    got_object_commit_get_tree_id(commit));
7460 	if (err)
7461 		goto done;
7462 	s->tree = s->root;
7463 
7464 	err = got_object_id_str(&commit_id_str, commit_id);
7465 	if (err != NULL)
7466 		goto done;
7467 
7468 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7469 		err = got_error_from_errno("asprintf");
7470 		goto done;
7471 	}
7472 
7473 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7474 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7475 	if (head_ref_name) {
7476 		s->head_ref_name = strdup(head_ref_name);
7477 		if (s->head_ref_name == NULL) {
7478 			err = got_error_from_errno("strdup");
7479 			goto done;
7480 		}
7481 	}
7482 	s->repo = repo;
7483 
7484 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7485 		err = add_color(&s->colors, "\\$$",
7486 		    TOG_COLOR_TREE_SUBMODULE,
7487 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7488 		if (err)
7489 			goto done;
7490 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7491 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7492 		if (err)
7493 			goto done;
7494 		err = add_color(&s->colors, "/$",
7495 		    TOG_COLOR_TREE_DIRECTORY,
7496 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7497 		if (err)
7498 			goto done;
7499 
7500 		err = add_color(&s->colors, "\\*$",
7501 		    TOG_COLOR_TREE_EXECUTABLE,
7502 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7503 		if (err)
7504 			goto done;
7505 
7506 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7507 		    get_color_value("TOG_COLOR_COMMIT"));
7508 		if (err)
7509 			goto done;
7510 	}
7511 
7512 	view->show = show_tree_view;
7513 	view->input = input_tree_view;
7514 	view->close = close_tree_view;
7515 	view->search_start = search_start_tree_view;
7516 	view->search_next = search_next_tree_view;
7517 done:
7518 	free(commit_id_str);
7519 	if (commit)
7520 		got_object_commit_close(commit);
7521 	if (err) {
7522 		if (view->close == NULL)
7523 			close_tree_view(view);
7524 		view_close(view);
7525 	}
7526 	return err;
7527 }
7528 
7529 static const struct got_error *
7530 close_tree_view(struct tog_view *view)
7531 {
7532 	struct tog_tree_view_state *s = &view->state.tree;
7533 
7534 	free_colors(&s->colors);
7535 	free(s->tree_label);
7536 	s->tree_label = NULL;
7537 	free(s->commit_id);
7538 	s->commit_id = NULL;
7539 	free(s->head_ref_name);
7540 	s->head_ref_name = NULL;
7541 	while (!TAILQ_EMPTY(&s->parents)) {
7542 		struct tog_parent_tree *parent;
7543 		parent = TAILQ_FIRST(&s->parents);
7544 		TAILQ_REMOVE(&s->parents, parent, entry);
7545 		if (parent->tree != s->root)
7546 			got_object_tree_close(parent->tree);
7547 		free(parent);
7548 
7549 	}
7550 	if (s->tree != NULL && s->tree != s->root)
7551 		got_object_tree_close(s->tree);
7552 	if (s->root)
7553 		got_object_tree_close(s->root);
7554 	return NULL;
7555 }
7556 
7557 static const struct got_error *
7558 search_start_tree_view(struct tog_view *view)
7559 {
7560 	struct tog_tree_view_state *s = &view->state.tree;
7561 
7562 	s->matched_entry = NULL;
7563 	return NULL;
7564 }
7565 
7566 static int
7567 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7568 {
7569 	regmatch_t regmatch;
7570 
7571 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7572 	    0) == 0;
7573 }
7574 
7575 static const struct got_error *
7576 search_next_tree_view(struct tog_view *view)
7577 {
7578 	struct tog_tree_view_state *s = &view->state.tree;
7579 	struct got_tree_entry *te = NULL;
7580 
7581 	if (!view->searching) {
7582 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7583 		return NULL;
7584 	}
7585 
7586 	if (s->matched_entry) {
7587 		if (view->searching == TOG_SEARCH_FORWARD) {
7588 			if (s->selected_entry)
7589 				te = got_tree_entry_get_next(s->tree,
7590 				    s->selected_entry);
7591 			else
7592 				te = got_object_tree_get_first_entry(s->tree);
7593 		} else {
7594 			if (s->selected_entry == NULL)
7595 				te = got_object_tree_get_last_entry(s->tree);
7596 			else
7597 				te = got_tree_entry_get_prev(s->tree,
7598 				    s->selected_entry);
7599 		}
7600 	} else {
7601 		if (s->selected_entry)
7602 			te = s->selected_entry;
7603 		else if (view->searching == TOG_SEARCH_FORWARD)
7604 			te = got_object_tree_get_first_entry(s->tree);
7605 		else
7606 			te = got_object_tree_get_last_entry(s->tree);
7607 	}
7608 
7609 	while (1) {
7610 		if (te == NULL) {
7611 			if (s->matched_entry == NULL) {
7612 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7613 				return NULL;
7614 			}
7615 			if (view->searching == TOG_SEARCH_FORWARD)
7616 				te = got_object_tree_get_first_entry(s->tree);
7617 			else
7618 				te = got_object_tree_get_last_entry(s->tree);
7619 		}
7620 
7621 		if (match_tree_entry(te, &view->regex)) {
7622 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7623 			s->matched_entry = te;
7624 			break;
7625 		}
7626 
7627 		if (view->searching == TOG_SEARCH_FORWARD)
7628 			te = got_tree_entry_get_next(s->tree, te);
7629 		else
7630 			te = got_tree_entry_get_prev(s->tree, te);
7631 	}
7632 
7633 	if (s->matched_entry) {
7634 		s->first_displayed_entry = s->matched_entry;
7635 		s->selected = 0;
7636 	}
7637 
7638 	return NULL;
7639 }
7640 
7641 static const struct got_error *
7642 show_tree_view(struct tog_view *view)
7643 {
7644 	const struct got_error *err = NULL;
7645 	struct tog_tree_view_state *s = &view->state.tree;
7646 	char *parent_path;
7647 
7648 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7649 	if (err)
7650 		return err;
7651 
7652 	err = draw_tree_entries(view, parent_path);
7653 	free(parent_path);
7654 
7655 	view_border(view);
7656 	return err;
7657 }
7658 
7659 static const struct got_error *
7660 tree_goto_line(struct tog_view *view, int nlines)
7661 {
7662 	const struct got_error		 *err = NULL;
7663 	struct tog_tree_view_state	 *s = &view->state.tree;
7664 	struct got_tree_entry		**fte, **lte, **ste;
7665 	int				  g, last, first = 1, i = 1;
7666 	int				  root = s->tree == s->root;
7667 	int				  off = root ? 1 : 2;
7668 
7669 	g = view->gline;
7670 	view->gline = 0;
7671 
7672 	if (g == 0)
7673 		g = 1;
7674 	else if (g > got_object_tree_get_nentries(s->tree))
7675 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7676 
7677 	fte = &s->first_displayed_entry;
7678 	lte = &s->last_displayed_entry;
7679 	ste = &s->selected_entry;
7680 
7681 	if (*fte != NULL) {
7682 		first = got_tree_entry_get_index(*fte);
7683 		first += off;  /* account for ".." */
7684 	}
7685 	last = got_tree_entry_get_index(*lte);
7686 	last += off;
7687 
7688 	if (g >= first && g <= last && g - first < nlines) {
7689 		s->selected = g - first;
7690 		return NULL;	/* gline is on the current page */
7691 	}
7692 
7693 	if (*ste != NULL) {
7694 		i = got_tree_entry_get_index(*ste);
7695 		i += off;
7696 	}
7697 
7698 	if (i < g) {
7699 		err = tree_scroll_down(view, g - i);
7700 		if (err)
7701 			return err;
7702 		if (got_tree_entry_get_index(*lte) >=
7703 		    got_object_tree_get_nentries(s->tree) - 1 &&
7704 		    first + s->selected < g &&
7705 		    s->selected < s->ndisplayed - 1) {
7706 			first = got_tree_entry_get_index(*fte);
7707 			first += off;
7708 			s->selected = g - first;
7709 		}
7710 	} else if (i > g)
7711 		tree_scroll_up(s, i - g);
7712 
7713 	if (g < nlines &&
7714 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7715 		s->selected = g - 1;
7716 
7717 	return NULL;
7718 }
7719 
7720 static const struct got_error *
7721 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7722 {
7723 	const struct got_error *err = NULL;
7724 	struct tog_tree_view_state *s = &view->state.tree;
7725 	struct got_tree_entry *te;
7726 	int n, nscroll = view->nlines - 3;
7727 
7728 	if (view->gline)
7729 		return tree_goto_line(view, nscroll);
7730 
7731 	switch (ch) {
7732 	case '0':
7733 	case '$':
7734 	case KEY_RIGHT:
7735 	case 'l':
7736 	case KEY_LEFT:
7737 	case 'h':
7738 		horizontal_scroll_input(view, ch);
7739 		break;
7740 	case 'i':
7741 		s->show_ids = !s->show_ids;
7742 		view->count = 0;
7743 		break;
7744 	case 'L':
7745 		view->count = 0;
7746 		if (!s->selected_entry)
7747 			break;
7748 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7749 		break;
7750 	case 'R':
7751 		view->count = 0;
7752 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7753 		break;
7754 	case 'g':
7755 	case '=':
7756 	case KEY_HOME:
7757 		s->selected = 0;
7758 		view->count = 0;
7759 		if (s->tree == s->root)
7760 			s->first_displayed_entry =
7761 			    got_object_tree_get_first_entry(s->tree);
7762 		else
7763 			s->first_displayed_entry = NULL;
7764 		break;
7765 	case 'G':
7766 	case '*':
7767 	case KEY_END: {
7768 		int eos = view->nlines - 3;
7769 
7770 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7771 			--eos;  /* border */
7772 		s->selected = 0;
7773 		view->count = 0;
7774 		te = got_object_tree_get_last_entry(s->tree);
7775 		for (n = 0; n < eos; n++) {
7776 			if (te == NULL) {
7777 				if (s->tree != s->root) {
7778 					s->first_displayed_entry = NULL;
7779 					n++;
7780 				}
7781 				break;
7782 			}
7783 			s->first_displayed_entry = te;
7784 			te = got_tree_entry_get_prev(s->tree, te);
7785 		}
7786 		if (n > 0)
7787 			s->selected = n - 1;
7788 		break;
7789 	}
7790 	case 'k':
7791 	case KEY_UP:
7792 	case CTRL('p'):
7793 		if (s->selected > 0) {
7794 			s->selected--;
7795 			break;
7796 		}
7797 		tree_scroll_up(s, 1);
7798 		if (s->selected_entry == NULL ||
7799 		    (s->tree == s->root && s->selected_entry ==
7800 		     got_object_tree_get_first_entry(s->tree)))
7801 			view->count = 0;
7802 		break;
7803 	case CTRL('u'):
7804 	case 'u':
7805 		nscroll /= 2;
7806 		/* FALL THROUGH */
7807 	case KEY_PPAGE:
7808 	case CTRL('b'):
7809 	case 'b':
7810 		if (s->tree == s->root) {
7811 			if (got_object_tree_get_first_entry(s->tree) ==
7812 			    s->first_displayed_entry)
7813 				s->selected -= MIN(s->selected, nscroll);
7814 		} else {
7815 			if (s->first_displayed_entry == NULL)
7816 				s->selected -= MIN(s->selected, nscroll);
7817 		}
7818 		tree_scroll_up(s, MAX(0, nscroll));
7819 		if (s->selected_entry == NULL ||
7820 		    (s->tree == s->root && s->selected_entry ==
7821 		     got_object_tree_get_first_entry(s->tree)))
7822 			view->count = 0;
7823 		break;
7824 	case 'j':
7825 	case KEY_DOWN:
7826 	case CTRL('n'):
7827 		if (s->selected < s->ndisplayed - 1) {
7828 			s->selected++;
7829 			break;
7830 		}
7831 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7832 		    == NULL) {
7833 			/* can't scroll any further */
7834 			view->count = 0;
7835 			break;
7836 		}
7837 		tree_scroll_down(view, 1);
7838 		break;
7839 	case CTRL('d'):
7840 	case 'd':
7841 		nscroll /= 2;
7842 		/* FALL THROUGH */
7843 	case KEY_NPAGE:
7844 	case CTRL('f'):
7845 	case 'f':
7846 	case ' ':
7847 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7848 		    == NULL) {
7849 			/* can't scroll any further; move cursor down */
7850 			if (s->selected < s->ndisplayed - 1)
7851 				s->selected += MIN(nscroll,
7852 				    s->ndisplayed - s->selected - 1);
7853 			else
7854 				view->count = 0;
7855 			break;
7856 		}
7857 		tree_scroll_down(view, nscroll);
7858 		break;
7859 	case KEY_ENTER:
7860 	case '\r':
7861 	case KEY_BACKSPACE:
7862 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7863 			struct tog_parent_tree *parent;
7864 			/* user selected '..' */
7865 			if (s->tree == s->root) {
7866 				view->count = 0;
7867 				break;
7868 			}
7869 			parent = TAILQ_FIRST(&s->parents);
7870 			TAILQ_REMOVE(&s->parents, parent,
7871 			    entry);
7872 			got_object_tree_close(s->tree);
7873 			s->tree = parent->tree;
7874 			s->first_displayed_entry =
7875 			    parent->first_displayed_entry;
7876 			s->selected_entry =
7877 			    parent->selected_entry;
7878 			s->selected = parent->selected;
7879 			if (s->selected > view->nlines - 3) {
7880 				err = offset_selection_down(view);
7881 				if (err)
7882 					break;
7883 			}
7884 			free(parent);
7885 		} else if (S_ISDIR(got_tree_entry_get_mode(
7886 		    s->selected_entry))) {
7887 			struct got_tree_object *subtree;
7888 			view->count = 0;
7889 			err = got_object_open_as_tree(&subtree, s->repo,
7890 			    got_tree_entry_get_id(s->selected_entry));
7891 			if (err)
7892 				break;
7893 			err = tree_view_visit_subtree(s, subtree);
7894 			if (err) {
7895 				got_object_tree_close(subtree);
7896 				break;
7897 			}
7898 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7899 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7900 		break;
7901 	case KEY_RESIZE:
7902 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7903 			s->selected = view->nlines - 4;
7904 		view->count = 0;
7905 		break;
7906 	default:
7907 		view->count = 0;
7908 		break;
7909 	}
7910 
7911 	return err;
7912 }
7913 
7914 __dead static void
7915 usage_tree(void)
7916 {
7917 	endwin();
7918 	fprintf(stderr,
7919 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7920 	    getprogname());
7921 	exit(1);
7922 }
7923 
7924 static const struct got_error *
7925 cmd_tree(int argc, char *argv[])
7926 {
7927 	const struct got_error *error;
7928 	struct got_repository *repo = NULL;
7929 	struct got_worktree *worktree = NULL;
7930 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7931 	struct got_object_id *commit_id = NULL;
7932 	struct got_commit_object *commit = NULL;
7933 	const char *commit_id_arg = NULL;
7934 	char *label = NULL;
7935 	struct got_reference *ref = NULL;
7936 	const char *head_ref_name = NULL;
7937 	int ch;
7938 	struct tog_view *view;
7939 	int *pack_fds = NULL;
7940 
7941 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7942 		switch (ch) {
7943 		case 'c':
7944 			commit_id_arg = optarg;
7945 			break;
7946 		case 'r':
7947 			repo_path = realpath(optarg, NULL);
7948 			if (repo_path == NULL)
7949 				return got_error_from_errno2("realpath",
7950 				    optarg);
7951 			break;
7952 		default:
7953 			usage_tree();
7954 			/* NOTREACHED */
7955 		}
7956 	}
7957 
7958 	argc -= optind;
7959 	argv += optind;
7960 
7961 	if (argc > 1)
7962 		usage_tree();
7963 
7964 	error = got_repo_pack_fds_open(&pack_fds);
7965 	if (error != NULL)
7966 		goto done;
7967 
7968 	if (repo_path == NULL) {
7969 		cwd = getcwd(NULL, 0);
7970 		if (cwd == NULL)
7971 			return got_error_from_errno("getcwd");
7972 		error = got_worktree_open(&worktree, cwd);
7973 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7974 			goto done;
7975 		if (worktree)
7976 			repo_path =
7977 			    strdup(got_worktree_get_repo_path(worktree));
7978 		else
7979 			repo_path = strdup(cwd);
7980 		if (repo_path == NULL) {
7981 			error = got_error_from_errno("strdup");
7982 			goto done;
7983 		}
7984 	}
7985 
7986 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7987 	if (error != NULL)
7988 		goto done;
7989 
7990 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7991 	    repo, worktree);
7992 	if (error)
7993 		goto done;
7994 
7995 	init_curses();
7996 
7997 	error = apply_unveil(got_repo_get_path(repo), NULL);
7998 	if (error)
7999 		goto done;
8000 
8001 	error = tog_load_refs(repo, 0);
8002 	if (error)
8003 		goto done;
8004 
8005 	if (commit_id_arg == NULL) {
8006 		error = got_repo_match_object_id(&commit_id, &label,
8007 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8008 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8009 		if (error)
8010 			goto done;
8011 		head_ref_name = label;
8012 	} else {
8013 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8014 		if (error == NULL)
8015 			head_ref_name = got_ref_get_name(ref);
8016 		else if (error->code != GOT_ERR_NOT_REF)
8017 			goto done;
8018 		error = got_repo_match_object_id(&commit_id, NULL,
8019 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8020 		if (error)
8021 			goto done;
8022 	}
8023 
8024 	error = got_object_open_as_commit(&commit, repo, commit_id);
8025 	if (error)
8026 		goto done;
8027 
8028 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8029 	if (view == NULL) {
8030 		error = got_error_from_errno("view_open");
8031 		goto done;
8032 	}
8033 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8034 	if (error)
8035 		goto done;
8036 	if (!got_path_is_root_dir(in_repo_path)) {
8037 		error = tree_view_walk_path(&view->state.tree, commit,
8038 		    in_repo_path);
8039 		if (error)
8040 			goto done;
8041 	}
8042 
8043 	if (worktree) {
8044 		/* Release work tree lock. */
8045 		got_worktree_close(worktree);
8046 		worktree = NULL;
8047 	}
8048 	error = view_loop(view);
8049 done:
8050 	free(repo_path);
8051 	free(cwd);
8052 	free(commit_id);
8053 	free(label);
8054 	if (ref)
8055 		got_ref_close(ref);
8056 	if (repo) {
8057 		const struct got_error *close_err = got_repo_close(repo);
8058 		if (error == NULL)
8059 			error = close_err;
8060 	}
8061 	if (pack_fds) {
8062 		const struct got_error *pack_err =
8063 		    got_repo_pack_fds_close(pack_fds);
8064 		if (error == NULL)
8065 			error = pack_err;
8066 	}
8067 	tog_free_refs();
8068 	return error;
8069 }
8070 
8071 static const struct got_error *
8072 ref_view_load_refs(struct tog_ref_view_state *s)
8073 {
8074 	struct got_reflist_entry *sre;
8075 	struct tog_reflist_entry *re;
8076 
8077 	s->nrefs = 0;
8078 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8079 		if (strncmp(got_ref_get_name(sre->ref),
8080 		    "refs/got/", 9) == 0 &&
8081 		    strncmp(got_ref_get_name(sre->ref),
8082 		    "refs/got/backup/", 16) != 0)
8083 			continue;
8084 
8085 		re = malloc(sizeof(*re));
8086 		if (re == NULL)
8087 			return got_error_from_errno("malloc");
8088 
8089 		re->ref = got_ref_dup(sre->ref);
8090 		if (re->ref == NULL)
8091 			return got_error_from_errno("got_ref_dup");
8092 		re->idx = s->nrefs++;
8093 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8094 	}
8095 
8096 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8097 	return NULL;
8098 }
8099 
8100 static void
8101 ref_view_free_refs(struct tog_ref_view_state *s)
8102 {
8103 	struct tog_reflist_entry *re;
8104 
8105 	while (!TAILQ_EMPTY(&s->refs)) {
8106 		re = TAILQ_FIRST(&s->refs);
8107 		TAILQ_REMOVE(&s->refs, re, entry);
8108 		got_ref_close(re->ref);
8109 		free(re);
8110 	}
8111 }
8112 
8113 static const struct got_error *
8114 open_ref_view(struct tog_view *view, struct got_repository *repo)
8115 {
8116 	const struct got_error *err = NULL;
8117 	struct tog_ref_view_state *s = &view->state.ref;
8118 
8119 	s->selected_entry = 0;
8120 	s->repo = repo;
8121 
8122 	TAILQ_INIT(&s->refs);
8123 	STAILQ_INIT(&s->colors);
8124 
8125 	err = ref_view_load_refs(s);
8126 	if (err)
8127 		goto done;
8128 
8129 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8130 		err = add_color(&s->colors, "^refs/heads/",
8131 		    TOG_COLOR_REFS_HEADS,
8132 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8133 		if (err)
8134 			goto done;
8135 
8136 		err = add_color(&s->colors, "^refs/tags/",
8137 		    TOG_COLOR_REFS_TAGS,
8138 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8139 		if (err)
8140 			goto done;
8141 
8142 		err = add_color(&s->colors, "^refs/remotes/",
8143 		    TOG_COLOR_REFS_REMOTES,
8144 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8145 		if (err)
8146 			goto done;
8147 
8148 		err = add_color(&s->colors, "^refs/got/backup/",
8149 		    TOG_COLOR_REFS_BACKUP,
8150 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8151 		if (err)
8152 			goto done;
8153 	}
8154 
8155 	view->show = show_ref_view;
8156 	view->input = input_ref_view;
8157 	view->close = close_ref_view;
8158 	view->search_start = search_start_ref_view;
8159 	view->search_next = search_next_ref_view;
8160 done:
8161 	if (err) {
8162 		if (view->close == NULL)
8163 			close_ref_view(view);
8164 		view_close(view);
8165 	}
8166 	return err;
8167 }
8168 
8169 static const struct got_error *
8170 close_ref_view(struct tog_view *view)
8171 {
8172 	struct tog_ref_view_state *s = &view->state.ref;
8173 
8174 	ref_view_free_refs(s);
8175 	free_colors(&s->colors);
8176 
8177 	return NULL;
8178 }
8179 
8180 static const struct got_error *
8181 resolve_reflist_entry(struct got_object_id **commit_id,
8182     struct tog_reflist_entry *re, struct got_repository *repo)
8183 {
8184 	const struct got_error *err = NULL;
8185 	struct got_object_id *obj_id;
8186 	struct got_tag_object *tag = NULL;
8187 	int obj_type;
8188 
8189 	*commit_id = NULL;
8190 
8191 	err = got_ref_resolve(&obj_id, repo, re->ref);
8192 	if (err)
8193 		return err;
8194 
8195 	err = got_object_get_type(&obj_type, repo, obj_id);
8196 	if (err)
8197 		goto done;
8198 
8199 	switch (obj_type) {
8200 	case GOT_OBJ_TYPE_COMMIT:
8201 		*commit_id = obj_id;
8202 		break;
8203 	case GOT_OBJ_TYPE_TAG:
8204 		err = got_object_open_as_tag(&tag, repo, obj_id);
8205 		if (err)
8206 			goto done;
8207 		free(obj_id);
8208 		err = got_object_get_type(&obj_type, repo,
8209 		    got_object_tag_get_object_id(tag));
8210 		if (err)
8211 			goto done;
8212 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8213 			err = got_error(GOT_ERR_OBJ_TYPE);
8214 			goto done;
8215 		}
8216 		*commit_id = got_object_id_dup(
8217 		    got_object_tag_get_object_id(tag));
8218 		if (*commit_id == NULL) {
8219 			err = got_error_from_errno("got_object_id_dup");
8220 			goto done;
8221 		}
8222 		break;
8223 	default:
8224 		err = got_error(GOT_ERR_OBJ_TYPE);
8225 		break;
8226 	}
8227 
8228 done:
8229 	if (tag)
8230 		got_object_tag_close(tag);
8231 	if (err) {
8232 		free(*commit_id);
8233 		*commit_id = NULL;
8234 	}
8235 	return err;
8236 }
8237 
8238 static const struct got_error *
8239 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8240     struct tog_reflist_entry *re, struct got_repository *repo)
8241 {
8242 	struct tog_view *log_view;
8243 	const struct got_error *err = NULL;
8244 	struct got_object_id *commit_id = NULL;
8245 
8246 	*new_view = NULL;
8247 
8248 	err = resolve_reflist_entry(&commit_id, re, repo);
8249 	if (err) {
8250 		if (err->code != GOT_ERR_OBJ_TYPE)
8251 			return err;
8252 		else
8253 			return NULL;
8254 	}
8255 
8256 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8257 	if (log_view == NULL) {
8258 		err = got_error_from_errno("view_open");
8259 		goto done;
8260 	}
8261 
8262 	err = open_log_view(log_view, commit_id, repo,
8263 	    got_ref_get_name(re->ref), "", 0);
8264 done:
8265 	if (err)
8266 		view_close(log_view);
8267 	else
8268 		*new_view = log_view;
8269 	free(commit_id);
8270 	return err;
8271 }
8272 
8273 static void
8274 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8275 {
8276 	struct tog_reflist_entry *re;
8277 	int i = 0;
8278 
8279 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8280 		return;
8281 
8282 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8283 	while (i++ < maxscroll) {
8284 		if (re == NULL)
8285 			break;
8286 		s->first_displayed_entry = re;
8287 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8288 	}
8289 }
8290 
8291 static const struct got_error *
8292 ref_scroll_down(struct tog_view *view, int maxscroll)
8293 {
8294 	struct tog_ref_view_state *s = &view->state.ref;
8295 	struct tog_reflist_entry *next, *last;
8296 	int n = 0;
8297 
8298 	if (s->first_displayed_entry)
8299 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8300 	else
8301 		next = TAILQ_FIRST(&s->refs);
8302 
8303 	last = s->last_displayed_entry;
8304 	while (next && n++ < maxscroll) {
8305 		if (last) {
8306 			s->last_displayed_entry = last;
8307 			last = TAILQ_NEXT(last, entry);
8308 		}
8309 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8310 			s->first_displayed_entry = next;
8311 			next = TAILQ_NEXT(next, entry);
8312 		}
8313 	}
8314 
8315 	return NULL;
8316 }
8317 
8318 static const struct got_error *
8319 search_start_ref_view(struct tog_view *view)
8320 {
8321 	struct tog_ref_view_state *s = &view->state.ref;
8322 
8323 	s->matched_entry = NULL;
8324 	return NULL;
8325 }
8326 
8327 static int
8328 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8329 {
8330 	regmatch_t regmatch;
8331 
8332 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8333 	    0) == 0;
8334 }
8335 
8336 static const struct got_error *
8337 search_next_ref_view(struct tog_view *view)
8338 {
8339 	struct tog_ref_view_state *s = &view->state.ref;
8340 	struct tog_reflist_entry *re = NULL;
8341 
8342 	if (!view->searching) {
8343 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8344 		return NULL;
8345 	}
8346 
8347 	if (s->matched_entry) {
8348 		if (view->searching == TOG_SEARCH_FORWARD) {
8349 			if (s->selected_entry)
8350 				re = TAILQ_NEXT(s->selected_entry, entry);
8351 			else
8352 				re = TAILQ_PREV(s->selected_entry,
8353 				    tog_reflist_head, entry);
8354 		} else {
8355 			if (s->selected_entry == NULL)
8356 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8357 			else
8358 				re = TAILQ_PREV(s->selected_entry,
8359 				    tog_reflist_head, entry);
8360 		}
8361 	} else {
8362 		if (s->selected_entry)
8363 			re = s->selected_entry;
8364 		else if (view->searching == TOG_SEARCH_FORWARD)
8365 			re = TAILQ_FIRST(&s->refs);
8366 		else
8367 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8368 	}
8369 
8370 	while (1) {
8371 		if (re == NULL) {
8372 			if (s->matched_entry == NULL) {
8373 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8374 				return NULL;
8375 			}
8376 			if (view->searching == TOG_SEARCH_FORWARD)
8377 				re = TAILQ_FIRST(&s->refs);
8378 			else
8379 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8380 		}
8381 
8382 		if (match_reflist_entry(re, &view->regex)) {
8383 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8384 			s->matched_entry = re;
8385 			break;
8386 		}
8387 
8388 		if (view->searching == TOG_SEARCH_FORWARD)
8389 			re = TAILQ_NEXT(re, entry);
8390 		else
8391 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8392 	}
8393 
8394 	if (s->matched_entry) {
8395 		s->first_displayed_entry = s->matched_entry;
8396 		s->selected = 0;
8397 	}
8398 
8399 	return NULL;
8400 }
8401 
8402 static const struct got_error *
8403 show_ref_view(struct tog_view *view)
8404 {
8405 	const struct got_error *err = NULL;
8406 	struct tog_ref_view_state *s = &view->state.ref;
8407 	struct tog_reflist_entry *re;
8408 	char *line = NULL;
8409 	wchar_t *wline;
8410 	struct tog_color *tc;
8411 	int width, n, scrollx;
8412 	int limit = view->nlines;
8413 
8414 	werase(view->window);
8415 
8416 	s->ndisplayed = 0;
8417 	if (view_is_hsplit_top(view))
8418 		--limit;  /* border */
8419 
8420 	if (limit == 0)
8421 		return NULL;
8422 
8423 	re = s->first_displayed_entry;
8424 
8425 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8426 	    s->nrefs) == -1)
8427 		return got_error_from_errno("asprintf");
8428 
8429 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8430 	if (err) {
8431 		free(line);
8432 		return err;
8433 	}
8434 	if (view_needs_focus_indication(view))
8435 		wstandout(view->window);
8436 	waddwstr(view->window, wline);
8437 	while (width++ < view->ncols)
8438 		waddch(view->window, ' ');
8439 	if (view_needs_focus_indication(view))
8440 		wstandend(view->window);
8441 	free(wline);
8442 	wline = NULL;
8443 	free(line);
8444 	line = NULL;
8445 	if (--limit <= 0)
8446 		return NULL;
8447 
8448 	n = 0;
8449 	view->maxx = 0;
8450 	while (re && limit > 0) {
8451 		char *line = NULL;
8452 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8453 
8454 		if (s->show_date) {
8455 			struct got_commit_object *ci;
8456 			struct got_tag_object *tag;
8457 			struct got_object_id *id;
8458 			struct tm tm;
8459 			time_t t;
8460 
8461 			err = got_ref_resolve(&id, s->repo, re->ref);
8462 			if (err)
8463 				return err;
8464 			err = got_object_open_as_tag(&tag, s->repo, id);
8465 			if (err) {
8466 				if (err->code != GOT_ERR_OBJ_TYPE) {
8467 					free(id);
8468 					return err;
8469 				}
8470 				err = got_object_open_as_commit(&ci, s->repo,
8471 				    id);
8472 				if (err) {
8473 					free(id);
8474 					return err;
8475 				}
8476 				t = got_object_commit_get_committer_time(ci);
8477 				got_object_commit_close(ci);
8478 			} else {
8479 				t = got_object_tag_get_tagger_time(tag);
8480 				got_object_tag_close(tag);
8481 			}
8482 			free(id);
8483 			if (gmtime_r(&t, &tm) == NULL)
8484 				return got_error_from_errno("gmtime_r");
8485 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8486 				return got_error(GOT_ERR_NO_SPACE);
8487 		}
8488 		if (got_ref_is_symbolic(re->ref)) {
8489 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8490 			    ymd : "", got_ref_get_name(re->ref),
8491 			    got_ref_get_symref_target(re->ref)) == -1)
8492 				return got_error_from_errno("asprintf");
8493 		} else if (s->show_ids) {
8494 			struct got_object_id *id;
8495 			char *id_str;
8496 			err = got_ref_resolve(&id, s->repo, re->ref);
8497 			if (err)
8498 				return err;
8499 			err = got_object_id_str(&id_str, id);
8500 			if (err) {
8501 				free(id);
8502 				return err;
8503 			}
8504 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8505 			    got_ref_get_name(re->ref), id_str) == -1) {
8506 				err = got_error_from_errno("asprintf");
8507 				free(id);
8508 				free(id_str);
8509 				return err;
8510 			}
8511 			free(id);
8512 			free(id_str);
8513 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8514 		    got_ref_get_name(re->ref)) == -1)
8515 			return got_error_from_errno("asprintf");
8516 
8517 		/* use full line width to determine view->maxx */
8518 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8519 		if (err) {
8520 			free(line);
8521 			return err;
8522 		}
8523 		view->maxx = MAX(view->maxx, width);
8524 		free(wline);
8525 		wline = NULL;
8526 
8527 		err = format_line(&wline, &width, &scrollx, line, view->x,
8528 		    view->ncols, 0, 0);
8529 		if (err) {
8530 			free(line);
8531 			return err;
8532 		}
8533 		if (n == s->selected) {
8534 			if (view->focussed)
8535 				wstandout(view->window);
8536 			s->selected_entry = re;
8537 		}
8538 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8539 		if (tc)
8540 			wattr_on(view->window,
8541 			    COLOR_PAIR(tc->colorpair), NULL);
8542 		waddwstr(view->window, &wline[scrollx]);
8543 		if (tc)
8544 			wattr_off(view->window,
8545 			    COLOR_PAIR(tc->colorpair), NULL);
8546 		if (width < view->ncols)
8547 			waddch(view->window, '\n');
8548 		if (n == s->selected && view->focussed)
8549 			wstandend(view->window);
8550 		free(line);
8551 		free(wline);
8552 		wline = NULL;
8553 		n++;
8554 		s->ndisplayed++;
8555 		s->last_displayed_entry = re;
8556 
8557 		limit--;
8558 		re = TAILQ_NEXT(re, entry);
8559 	}
8560 
8561 	view_border(view);
8562 	return err;
8563 }
8564 
8565 static const struct got_error *
8566 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8567     struct tog_reflist_entry *re, struct got_repository *repo)
8568 {
8569 	const struct got_error *err = NULL;
8570 	struct got_object_id *commit_id = NULL;
8571 	struct tog_view *tree_view;
8572 
8573 	*new_view = NULL;
8574 
8575 	err = resolve_reflist_entry(&commit_id, re, repo);
8576 	if (err) {
8577 		if (err->code != GOT_ERR_OBJ_TYPE)
8578 			return err;
8579 		else
8580 			return NULL;
8581 	}
8582 
8583 
8584 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8585 	if (tree_view == NULL) {
8586 		err = got_error_from_errno("view_open");
8587 		goto done;
8588 	}
8589 
8590 	err = open_tree_view(tree_view, commit_id,
8591 	    got_ref_get_name(re->ref), repo);
8592 	if (err)
8593 		goto done;
8594 
8595 	*new_view = tree_view;
8596 done:
8597 	free(commit_id);
8598 	return err;
8599 }
8600 
8601 static const struct got_error *
8602 ref_goto_line(struct tog_view *view, int nlines)
8603 {
8604 	const struct got_error		*err = NULL;
8605 	struct tog_ref_view_state	*s = &view->state.ref;
8606 	int				 g, idx = s->selected_entry->idx;
8607 
8608 	g = view->gline;
8609 	view->gline = 0;
8610 
8611 	if (g == 0)
8612 		g = 1;
8613 	else if (g > s->nrefs)
8614 		g = s->nrefs;
8615 
8616 	if (g >= s->first_displayed_entry->idx + 1 &&
8617 	    g <= s->last_displayed_entry->idx + 1 &&
8618 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8619 		s->selected = g - s->first_displayed_entry->idx - 1;
8620 		return NULL;
8621 	}
8622 
8623 	if (idx + 1 < g) {
8624 		err = ref_scroll_down(view, g - idx - 1);
8625 		if (err)
8626 			return err;
8627 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8628 		    s->first_displayed_entry->idx + s->selected < g &&
8629 		    s->selected < s->ndisplayed - 1)
8630 			s->selected = g - s->first_displayed_entry->idx - 1;
8631 	} else if (idx + 1 > g)
8632 		ref_scroll_up(s, idx - g + 1);
8633 
8634 	if (g < nlines && s->first_displayed_entry->idx == 0)
8635 		s->selected = g - 1;
8636 
8637 	return NULL;
8638 
8639 }
8640 
8641 static const struct got_error *
8642 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8643 {
8644 	const struct got_error *err = NULL;
8645 	struct tog_ref_view_state *s = &view->state.ref;
8646 	struct tog_reflist_entry *re;
8647 	int n, nscroll = view->nlines - 1;
8648 
8649 	if (view->gline)
8650 		return ref_goto_line(view, nscroll);
8651 
8652 	switch (ch) {
8653 	case '0':
8654 	case '$':
8655 	case KEY_RIGHT:
8656 	case 'l':
8657 	case KEY_LEFT:
8658 	case 'h':
8659 		horizontal_scroll_input(view, ch);
8660 		break;
8661 	case 'i':
8662 		s->show_ids = !s->show_ids;
8663 		view->count = 0;
8664 		break;
8665 	case 'm':
8666 		s->show_date = !s->show_date;
8667 		view->count = 0;
8668 		break;
8669 	case 'o':
8670 		s->sort_by_date = !s->sort_by_date;
8671 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8672 		view->count = 0;
8673 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8674 		    got_ref_cmp_by_commit_timestamp_descending :
8675 		    tog_ref_cmp_by_name, s->repo);
8676 		if (err)
8677 			break;
8678 		got_reflist_object_id_map_free(tog_refs_idmap);
8679 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8680 		    &tog_refs, s->repo);
8681 		if (err)
8682 			break;
8683 		ref_view_free_refs(s);
8684 		err = ref_view_load_refs(s);
8685 		break;
8686 	case KEY_ENTER:
8687 	case '\r':
8688 		view->count = 0;
8689 		if (!s->selected_entry)
8690 			break;
8691 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8692 		break;
8693 	case 'T':
8694 		view->count = 0;
8695 		if (!s->selected_entry)
8696 			break;
8697 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8698 		break;
8699 	case 'g':
8700 	case '=':
8701 	case KEY_HOME:
8702 		s->selected = 0;
8703 		view->count = 0;
8704 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8705 		break;
8706 	case 'G':
8707 	case '*':
8708 	case KEY_END: {
8709 		int eos = view->nlines - 1;
8710 
8711 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8712 			--eos;  /* border */
8713 		s->selected = 0;
8714 		view->count = 0;
8715 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8716 		for (n = 0; n < eos; n++) {
8717 			if (re == NULL)
8718 				break;
8719 			s->first_displayed_entry = re;
8720 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8721 		}
8722 		if (n > 0)
8723 			s->selected = n - 1;
8724 		break;
8725 	}
8726 	case 'k':
8727 	case KEY_UP:
8728 	case CTRL('p'):
8729 		if (s->selected > 0) {
8730 			s->selected--;
8731 			break;
8732 		}
8733 		ref_scroll_up(s, 1);
8734 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8735 			view->count = 0;
8736 		break;
8737 	case CTRL('u'):
8738 	case 'u':
8739 		nscroll /= 2;
8740 		/* FALL THROUGH */
8741 	case KEY_PPAGE:
8742 	case CTRL('b'):
8743 	case 'b':
8744 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8745 			s->selected -= MIN(nscroll, s->selected);
8746 		ref_scroll_up(s, MAX(0, nscroll));
8747 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8748 			view->count = 0;
8749 		break;
8750 	case 'j':
8751 	case KEY_DOWN:
8752 	case CTRL('n'):
8753 		if (s->selected < s->ndisplayed - 1) {
8754 			s->selected++;
8755 			break;
8756 		}
8757 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8758 			/* can't scroll any further */
8759 			view->count = 0;
8760 			break;
8761 		}
8762 		ref_scroll_down(view, 1);
8763 		break;
8764 	case CTRL('d'):
8765 	case 'd':
8766 		nscroll /= 2;
8767 		/* FALL THROUGH */
8768 	case KEY_NPAGE:
8769 	case CTRL('f'):
8770 	case 'f':
8771 	case ' ':
8772 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8773 			/* can't scroll any further; move cursor down */
8774 			if (s->selected < s->ndisplayed - 1)
8775 				s->selected += MIN(nscroll,
8776 				    s->ndisplayed - s->selected - 1);
8777 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8778 				s->selected += s->ndisplayed - s->selected - 1;
8779 			view->count = 0;
8780 			break;
8781 		}
8782 		ref_scroll_down(view, nscroll);
8783 		break;
8784 	case CTRL('l'):
8785 		view->count = 0;
8786 		tog_free_refs();
8787 		err = tog_load_refs(s->repo, s->sort_by_date);
8788 		if (err)
8789 			break;
8790 		ref_view_free_refs(s);
8791 		err = ref_view_load_refs(s);
8792 		break;
8793 	case KEY_RESIZE:
8794 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8795 			s->selected = view->nlines - 2;
8796 		break;
8797 	default:
8798 		view->count = 0;
8799 		break;
8800 	}
8801 
8802 	return err;
8803 }
8804 
8805 __dead static void
8806 usage_ref(void)
8807 {
8808 	endwin();
8809 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8810 	    getprogname());
8811 	exit(1);
8812 }
8813 
8814 static const struct got_error *
8815 cmd_ref(int argc, char *argv[])
8816 {
8817 	const struct got_error *error;
8818 	struct got_repository *repo = NULL;
8819 	struct got_worktree *worktree = NULL;
8820 	char *cwd = NULL, *repo_path = NULL;
8821 	int ch;
8822 	struct tog_view *view;
8823 	int *pack_fds = NULL;
8824 
8825 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8826 		switch (ch) {
8827 		case 'r':
8828 			repo_path = realpath(optarg, NULL);
8829 			if (repo_path == NULL)
8830 				return got_error_from_errno2("realpath",
8831 				    optarg);
8832 			break;
8833 		default:
8834 			usage_ref();
8835 			/* NOTREACHED */
8836 		}
8837 	}
8838 
8839 	argc -= optind;
8840 	argv += optind;
8841 
8842 	if (argc > 1)
8843 		usage_ref();
8844 
8845 	error = got_repo_pack_fds_open(&pack_fds);
8846 	if (error != NULL)
8847 		goto done;
8848 
8849 	if (repo_path == NULL) {
8850 		cwd = getcwd(NULL, 0);
8851 		if (cwd == NULL)
8852 			return got_error_from_errno("getcwd");
8853 		error = got_worktree_open(&worktree, cwd);
8854 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8855 			goto done;
8856 		if (worktree)
8857 			repo_path =
8858 			    strdup(got_worktree_get_repo_path(worktree));
8859 		else
8860 			repo_path = strdup(cwd);
8861 		if (repo_path == NULL) {
8862 			error = got_error_from_errno("strdup");
8863 			goto done;
8864 		}
8865 	}
8866 
8867 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8868 	if (error != NULL)
8869 		goto done;
8870 
8871 	init_curses();
8872 
8873 	error = apply_unveil(got_repo_get_path(repo), NULL);
8874 	if (error)
8875 		goto done;
8876 
8877 	error = tog_load_refs(repo, 0);
8878 	if (error)
8879 		goto done;
8880 
8881 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8882 	if (view == NULL) {
8883 		error = got_error_from_errno("view_open");
8884 		goto done;
8885 	}
8886 
8887 	error = open_ref_view(view, repo);
8888 	if (error)
8889 		goto done;
8890 
8891 	if (worktree) {
8892 		/* Release work tree lock. */
8893 		got_worktree_close(worktree);
8894 		worktree = NULL;
8895 	}
8896 	error = view_loop(view);
8897 done:
8898 	free(repo_path);
8899 	free(cwd);
8900 	if (repo) {
8901 		const struct got_error *close_err = got_repo_close(repo);
8902 		if (close_err)
8903 			error = close_err;
8904 	}
8905 	if (pack_fds) {
8906 		const struct got_error *pack_err =
8907 		    got_repo_pack_fds_close(pack_fds);
8908 		if (error == NULL)
8909 			error = pack_err;
8910 	}
8911 	tog_free_refs();
8912 	return error;
8913 }
8914 
8915 static const struct got_error*
8916 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8917     const char *str)
8918 {
8919 	size_t len;
8920 
8921 	if (win == NULL)
8922 		win = stdscr;
8923 
8924 	len = strlen(str);
8925 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8926 
8927 	if (focus)
8928 		wstandout(win);
8929 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8930 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8931 	if (focus)
8932 		wstandend(win);
8933 
8934 	return NULL;
8935 }
8936 
8937 static const struct got_error *
8938 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8939 {
8940 	off_t *p;
8941 
8942 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8943 	if (p == NULL) {
8944 		free(*line_offsets);
8945 		*line_offsets = NULL;
8946 		return got_error_from_errno("reallocarray");
8947 	}
8948 
8949 	*line_offsets = p;
8950 	(*line_offsets)[*nlines] = off;
8951 	++(*nlines);
8952 	return NULL;
8953 }
8954 
8955 static const struct got_error *
8956 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8957 {
8958 	*ret = 0;
8959 
8960 	for (;n > 0; --n, ++km) {
8961 		char	*t0, *t, *k;
8962 		size_t	 len = 1;
8963 
8964 		if (km->keys == NULL)
8965 			continue;
8966 
8967 		t = t0 = strdup(km->keys);
8968 		if (t0 == NULL)
8969 			return got_error_from_errno("strdup");
8970 
8971 		len += strlen(t);
8972 		while ((k = strsep(&t, " ")) != NULL)
8973 			len += strlen(k) > 1 ? 2 : 0;
8974 		free(t0);
8975 		*ret = MAX(*ret, len);
8976 	}
8977 
8978 	return NULL;
8979 }
8980 
8981 /*
8982  * Write keymap section headers, keys, and key info in km to f.
8983  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8984  * wrap control and symbolic keys in guillemets, else use <>.
8985  */
8986 static const struct got_error *
8987 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8988 {
8989 	int n, len = width;
8990 
8991 	if (km->keys) {
8992 		static const char *u8_glyph[] = {
8993 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8994 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8995 		};
8996 		char	*t0, *t, *k;
8997 		int	 cs, s, first = 1;
8998 
8999 		cs = got_locale_is_utf8();
9000 
9001 		t = t0 = strdup(km->keys);
9002 		if (t0 == NULL)
9003 			return got_error_from_errno("strdup");
9004 
9005 		len = strlen(km->keys);
9006 		while ((k = strsep(&t, " ")) != NULL) {
9007 			s = strlen(k) > 1;  /* control or symbolic key */
9008 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9009 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9010 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9011 			if (n < 0) {
9012 				free(t0);
9013 				return got_error_from_errno("fprintf");
9014 			}
9015 			first = 0;
9016 			len += s ? 2 : 0;
9017 			*off += n;
9018 		}
9019 		free(t0);
9020 	}
9021 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9022 	if (n < 0)
9023 		return got_error_from_errno("fprintf");
9024 	*off += n;
9025 
9026 	return NULL;
9027 }
9028 
9029 static const struct got_error *
9030 format_help(struct tog_help_view_state *s)
9031 {
9032 	const struct got_error		*err = NULL;
9033 	off_t				 off = 0;
9034 	int				 i, max, n, show = s->all;
9035 	static const struct tog_key_map	 km[] = {
9036 #define KEYMAP_(info, type)	{ NULL, (info), type }
9037 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9038 		GENERATE_HELP
9039 #undef KEYMAP_
9040 #undef KEY_
9041 	};
9042 
9043 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9044 	if (err)
9045 		return err;
9046 
9047 	n = nitems(km);
9048 	err = max_key_str(&max, km, n);
9049 	if (err)
9050 		return err;
9051 
9052 	for (i = 0; i < n; ++i) {
9053 		if (km[i].keys == NULL) {
9054 			show = s->all;
9055 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9056 			    km[i].type == s->type || s->all)
9057 				show = 1;
9058 		}
9059 		if (show) {
9060 			err = format_help_line(&off, s->f, &km[i], max);
9061 			if (err)
9062 				return err;
9063 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9064 			if (err)
9065 				return err;
9066 		}
9067 	}
9068 	fputc('\n', s->f);
9069 	++off;
9070 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9071 	return err;
9072 }
9073 
9074 static const struct got_error *
9075 create_help(struct tog_help_view_state *s)
9076 {
9077 	FILE			*f;
9078 	const struct got_error	*err;
9079 
9080 	free(s->line_offsets);
9081 	s->line_offsets = NULL;
9082 	s->nlines = 0;
9083 
9084 	f = got_opentemp();
9085 	if (f == NULL)
9086 		return got_error_from_errno("got_opentemp");
9087 	s->f = f;
9088 
9089 	err = format_help(s);
9090 	if (err)
9091 		return err;
9092 
9093 	if (s->f && fflush(s->f) != 0)
9094 		return got_error_from_errno("fflush");
9095 
9096 	return NULL;
9097 }
9098 
9099 static const struct got_error *
9100 search_start_help_view(struct tog_view *view)
9101 {
9102 	view->state.help.matched_line = 0;
9103 	return NULL;
9104 }
9105 
9106 static void
9107 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9108     size_t *nlines, int **first, int **last, int **match, int **selected)
9109 {
9110 	struct tog_help_view_state *s = &view->state.help;
9111 
9112 	*f = s->f;
9113 	*nlines = s->nlines;
9114 	*line_offsets = s->line_offsets;
9115 	*match = &s->matched_line;
9116 	*first = &s->first_displayed_line;
9117 	*last = &s->last_displayed_line;
9118 	*selected = &s->selected_line;
9119 }
9120 
9121 static const struct got_error *
9122 show_help_view(struct tog_view *view)
9123 {
9124 	struct tog_help_view_state	*s = &view->state.help;
9125 	const struct got_error		*err;
9126 	regmatch_t			*regmatch = &view->regmatch;
9127 	wchar_t				*wline;
9128 	char				*line;
9129 	ssize_t				 linelen;
9130 	size_t				 linesz = 0;
9131 	int				 width, nprinted = 0, rc = 0;
9132 	int				 eos = view->nlines;
9133 
9134 	if (view_is_hsplit_top(view))
9135 		--eos;  /* account for border */
9136 
9137 	s->lineno = 0;
9138 	rewind(s->f);
9139 	werase(view->window);
9140 
9141 	if (view->gline > s->nlines - 1)
9142 		view->gline = s->nlines - 1;
9143 
9144 	err = win_draw_center(view->window, 0, 0, view->ncols,
9145 	    view_needs_focus_indication(view),
9146 	    "tog help (press q to return to tog)");
9147 	if (err)
9148 		return err;
9149 	if (eos <= 1)
9150 		return NULL;
9151 	waddstr(view->window, "\n\n");
9152 	eos -= 2;
9153 
9154 	s->eof = 0;
9155 	view->maxx = 0;
9156 	line = NULL;
9157 	while (eos > 0 && nprinted < eos) {
9158 		attr_t attr = 0;
9159 
9160 		linelen = getline(&line, &linesz, s->f);
9161 		if (linelen == -1) {
9162 			if (!feof(s->f)) {
9163 				free(line);
9164 				return got_ferror(s->f, GOT_ERR_IO);
9165 			}
9166 			s->eof = 1;
9167 			break;
9168 		}
9169 		if (++s->lineno < s->first_displayed_line)
9170 			continue;
9171 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9172 			continue;
9173 		if (s->lineno == view->hiline)
9174 			attr = A_STANDOUT;
9175 
9176 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9177 		    view->x ? 1 : 0);
9178 		if (err) {
9179 			free(line);
9180 			return err;
9181 		}
9182 		view->maxx = MAX(view->maxx, width);
9183 		free(wline);
9184 		wline = NULL;
9185 
9186 		if (attr)
9187 			wattron(view->window, attr);
9188 		if (s->first_displayed_line + nprinted == s->matched_line &&
9189 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9190 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9191 			    view->window, view->x, regmatch);
9192 			if (err) {
9193 				free(line);
9194 				return err;
9195 			}
9196 		} else {
9197 			int skip;
9198 
9199 			err = format_line(&wline, &width, &skip, line,
9200 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9201 			if (err) {
9202 				free(line);
9203 				return err;
9204 			}
9205 			waddwstr(view->window, &wline[skip]);
9206 			free(wline);
9207 			wline = NULL;
9208 		}
9209 		if (s->lineno == view->hiline) {
9210 			while (width++ < view->ncols)
9211 				waddch(view->window, ' ');
9212 		} else {
9213 			if (width < view->ncols)
9214 				waddch(view->window, '\n');
9215 		}
9216 		if (attr)
9217 			wattroff(view->window, attr);
9218 		if (++nprinted == 1)
9219 			s->first_displayed_line = s->lineno;
9220 	}
9221 	free(line);
9222 	if (nprinted > 0)
9223 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9224 	else
9225 		s->last_displayed_line = s->first_displayed_line;
9226 
9227 	view_border(view);
9228 
9229 	if (s->eof) {
9230 		rc = waddnstr(view->window,
9231 		    "See the tog(1) manual page for full documentation",
9232 		    view->ncols - 1);
9233 		if (rc == ERR)
9234 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9235 	} else {
9236 		wmove(view->window, view->nlines - 1, 0);
9237 		wclrtoeol(view->window);
9238 		wstandout(view->window);
9239 		rc = waddnstr(view->window, "scroll down for more...",
9240 		    view->ncols - 1);
9241 		if (rc == ERR)
9242 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9243 		if (getcurx(view->window) < view->ncols - 6) {
9244 			rc = wprintw(view->window, "[%.0f%%]",
9245 			    100.00 * s->last_displayed_line / s->nlines);
9246 			if (rc == ERR)
9247 				return got_error_msg(GOT_ERR_IO, "wprintw");
9248 		}
9249 		wstandend(view->window);
9250 	}
9251 
9252 	return NULL;
9253 }
9254 
9255 static const struct got_error *
9256 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9257 {
9258 	struct tog_help_view_state	*s = &view->state.help;
9259 	const struct got_error		*err = NULL;
9260 	char				*line = NULL;
9261 	ssize_t				 linelen;
9262 	size_t				 linesz = 0;
9263 	int				 eos, nscroll;
9264 
9265 	eos = nscroll = view->nlines;
9266 	if (view_is_hsplit_top(view))
9267 		--eos;  /* border */
9268 
9269 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9270 
9271 	switch (ch) {
9272 	case '0':
9273 	case '$':
9274 	case KEY_RIGHT:
9275 	case 'l':
9276 	case KEY_LEFT:
9277 	case 'h':
9278 		horizontal_scroll_input(view, ch);
9279 		break;
9280 	case 'g':
9281 	case KEY_HOME:
9282 		s->first_displayed_line = 1;
9283 		view->count = 0;
9284 		break;
9285 	case 'G':
9286 	case KEY_END:
9287 		view->count = 0;
9288 		if (s->eof)
9289 			break;
9290 		s->first_displayed_line = (s->nlines - eos) + 3;
9291 		s->eof = 1;
9292 		break;
9293 	case 'k':
9294 	case KEY_UP:
9295 		if (s->first_displayed_line > 1)
9296 			--s->first_displayed_line;
9297 		else
9298 			view->count = 0;
9299 		break;
9300 	case CTRL('u'):
9301 	case 'u':
9302 		nscroll /= 2;
9303 		/* FALL THROUGH */
9304 	case KEY_PPAGE:
9305 	case CTRL('b'):
9306 	case 'b':
9307 		if (s->first_displayed_line == 1) {
9308 			view->count = 0;
9309 			break;
9310 		}
9311 		while (--nscroll > 0 && s->first_displayed_line > 1)
9312 			s->first_displayed_line--;
9313 		break;
9314 	case 'j':
9315 	case KEY_DOWN:
9316 	case CTRL('n'):
9317 		if (!s->eof)
9318 			++s->first_displayed_line;
9319 		else
9320 			view->count = 0;
9321 		break;
9322 	case CTRL('d'):
9323 	case 'd':
9324 		nscroll /= 2;
9325 		/* FALL THROUGH */
9326 	case KEY_NPAGE:
9327 	case CTRL('f'):
9328 	case 'f':
9329 	case ' ':
9330 		if (s->eof) {
9331 			view->count = 0;
9332 			break;
9333 		}
9334 		while (!s->eof && --nscroll > 0) {
9335 			linelen = getline(&line, &linesz, s->f);
9336 			s->first_displayed_line++;
9337 			if (linelen == -1) {
9338 				if (feof(s->f))
9339 					s->eof = 1;
9340 				else
9341 					err = got_ferror(s->f, GOT_ERR_IO);
9342 				break;
9343 			}
9344 		}
9345 		free(line);
9346 		break;
9347 	default:
9348 		view->count = 0;
9349 		break;
9350 	}
9351 
9352 	return err;
9353 }
9354 
9355 static const struct got_error *
9356 close_help_view(struct tog_view *view)
9357 {
9358 	struct tog_help_view_state *s = &view->state.help;
9359 
9360 	free(s->line_offsets);
9361 	s->line_offsets = NULL;
9362 	if (fclose(s->f) == EOF)
9363 		return got_error_from_errno("fclose");
9364 
9365 	return NULL;
9366 }
9367 
9368 static const struct got_error *
9369 reset_help_view(struct tog_view *view)
9370 {
9371 	struct tog_help_view_state *s = &view->state.help;
9372 
9373 
9374 	if (s->f && fclose(s->f) == EOF)
9375 		return got_error_from_errno("fclose");
9376 
9377 	wclear(view->window);
9378 	view->count = 0;
9379 	view->x = 0;
9380 	s->all = !s->all;
9381 	s->first_displayed_line = 1;
9382 	s->last_displayed_line = view->nlines;
9383 	s->matched_line = 0;
9384 
9385 	return create_help(s);
9386 }
9387 
9388 static const struct got_error *
9389 open_help_view(struct tog_view *view, struct tog_view *parent)
9390 {
9391 	const struct got_error		*err = NULL;
9392 	struct tog_help_view_state	*s = &view->state.help;
9393 
9394 	s->type = (enum tog_keymap_type)parent->type;
9395 	s->first_displayed_line = 1;
9396 	s->last_displayed_line = view->nlines;
9397 	s->selected_line = 1;
9398 
9399 	view->show = show_help_view;
9400 	view->input = input_help_view;
9401 	view->reset = reset_help_view;
9402 	view->close = close_help_view;
9403 	view->search_start = search_start_help_view;
9404 	view->search_setup = search_setup_help_view;
9405 	view->search_next = search_next_view_match;
9406 
9407 	err = create_help(s);
9408 	return err;
9409 }
9410 
9411 static const struct got_error *
9412 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9413     enum tog_view_type request, int y, int x)
9414 {
9415 	const struct got_error *err = NULL;
9416 
9417 	*new_view = NULL;
9418 
9419 	switch (request) {
9420 	case TOG_VIEW_DIFF:
9421 		if (view->type == TOG_VIEW_LOG) {
9422 			struct tog_log_view_state *s = &view->state.log;
9423 
9424 			err = open_diff_view_for_commit(new_view, y, x,
9425 			    s->selected_entry->commit, s->selected_entry->id,
9426 			    view, s->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_BLAME:
9432 		if (view->type == TOG_VIEW_TREE) {
9433 			struct tog_tree_view_state *s = &view->state.tree;
9434 
9435 			err = blame_tree_entry(new_view, y, x,
9436 			    s->selected_entry, &s->parents, s->commit_id,
9437 			    s->repo);
9438 		} else
9439 			return got_error_msg(GOT_ERR_NOT_IMPL,
9440 			    "parent/child view pair not supported");
9441 		break;
9442 	case TOG_VIEW_LOG:
9443 		if (view->type == TOG_VIEW_BLAME)
9444 			err = log_annotated_line(new_view, y, x,
9445 			    view->state.blame.repo, view->state.blame.id_to_log);
9446 		else if (view->type == TOG_VIEW_TREE)
9447 			err = log_selected_tree_entry(new_view, y, x,
9448 			    &view->state.tree);
9449 		else if (view->type == TOG_VIEW_REF)
9450 			err = log_ref_entry(new_view, y, x,
9451 			    view->state.ref.selected_entry,
9452 			    view->state.ref.repo);
9453 		else
9454 			return got_error_msg(GOT_ERR_NOT_IMPL,
9455 			    "parent/child view pair not supported");
9456 		break;
9457 	case TOG_VIEW_TREE:
9458 		if (view->type == TOG_VIEW_LOG)
9459 			err = browse_commit_tree(new_view, y, x,
9460 			    view->state.log.selected_entry,
9461 			    view->state.log.in_repo_path,
9462 			    view->state.log.head_ref_name,
9463 			    view->state.log.repo);
9464 		else if (view->type == TOG_VIEW_REF)
9465 			err = browse_ref_tree(new_view, y, x,
9466 			    view->state.ref.selected_entry,
9467 			    view->state.ref.repo);
9468 		else
9469 			return got_error_msg(GOT_ERR_NOT_IMPL,
9470 			    "parent/child view pair not supported");
9471 		break;
9472 	case TOG_VIEW_REF:
9473 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9474 		if (*new_view == NULL)
9475 			return got_error_from_errno("view_open");
9476 		if (view->type == TOG_VIEW_LOG)
9477 			err = open_ref_view(*new_view, view->state.log.repo);
9478 		else if (view->type == TOG_VIEW_TREE)
9479 			err = open_ref_view(*new_view, view->state.tree.repo);
9480 		else
9481 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9482 			    "parent/child view pair not supported");
9483 		if (err)
9484 			view_close(*new_view);
9485 		break;
9486 	case TOG_VIEW_HELP:
9487 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9488 		if (*new_view == NULL)
9489 			return got_error_from_errno("view_open");
9490 		err = open_help_view(*new_view, view);
9491 		if (err)
9492 			view_close(*new_view);
9493 		break;
9494 	default:
9495 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9496 	}
9497 
9498 	return err;
9499 }
9500 
9501 /*
9502  * If view was scrolled down to move the selected line into view when opening a
9503  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9504  */
9505 static void
9506 offset_selection_up(struct tog_view *view)
9507 {
9508 	switch (view->type) {
9509 	case TOG_VIEW_BLAME: {
9510 		struct tog_blame_view_state *s = &view->state.blame;
9511 		if (s->first_displayed_line == 1) {
9512 			s->selected_line = MAX(s->selected_line - view->offset,
9513 			    1);
9514 			break;
9515 		}
9516 		if (s->first_displayed_line > view->offset)
9517 			s->first_displayed_line -= view->offset;
9518 		else
9519 			s->first_displayed_line = 1;
9520 		s->selected_line += view->offset;
9521 		break;
9522 	}
9523 	case TOG_VIEW_LOG:
9524 		log_scroll_up(&view->state.log, view->offset);
9525 		view->state.log.selected += view->offset;
9526 		break;
9527 	case TOG_VIEW_REF:
9528 		ref_scroll_up(&view->state.ref, view->offset);
9529 		view->state.ref.selected += view->offset;
9530 		break;
9531 	case TOG_VIEW_TREE:
9532 		tree_scroll_up(&view->state.tree, view->offset);
9533 		view->state.tree.selected += view->offset;
9534 		break;
9535 	default:
9536 		break;
9537 	}
9538 
9539 	view->offset = 0;
9540 }
9541 
9542 /*
9543  * If the selected line is in the section of screen covered by the bottom split,
9544  * scroll down offset lines to move it into view and index its new position.
9545  */
9546 static const struct got_error *
9547 offset_selection_down(struct tog_view *view)
9548 {
9549 	const struct got_error	*err = NULL;
9550 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9551 	int			*selected = NULL;
9552 	int			 header, offset;
9553 
9554 	switch (view->type) {
9555 	case TOG_VIEW_BLAME: {
9556 		struct tog_blame_view_state *s = &view->state.blame;
9557 		header = 3;
9558 		scrolld = NULL;
9559 		if (s->selected_line > view->nlines - header) {
9560 			offset = abs(view->nlines - s->selected_line - header);
9561 			s->first_displayed_line += offset;
9562 			s->selected_line -= offset;
9563 			view->offset = offset;
9564 		}
9565 		break;
9566 	}
9567 	case TOG_VIEW_LOG: {
9568 		struct tog_log_view_state *s = &view->state.log;
9569 		scrolld = &log_scroll_down;
9570 		header = view_is_parent_view(view) ? 3 : 2;
9571 		selected = &s->selected;
9572 		break;
9573 	}
9574 	case TOG_VIEW_REF: {
9575 		struct tog_ref_view_state *s = &view->state.ref;
9576 		scrolld = &ref_scroll_down;
9577 		header = 3;
9578 		selected = &s->selected;
9579 		break;
9580 	}
9581 	case TOG_VIEW_TREE: {
9582 		struct tog_tree_view_state *s = &view->state.tree;
9583 		scrolld = &tree_scroll_down;
9584 		header = 5;
9585 		selected = &s->selected;
9586 		break;
9587 	}
9588 	default:
9589 		selected = NULL;
9590 		scrolld = NULL;
9591 		header = 0;
9592 		break;
9593 	}
9594 
9595 	if (selected && *selected > view->nlines - header) {
9596 		offset = abs(view->nlines - *selected - header);
9597 		view->offset = offset;
9598 		if (scrolld && offset) {
9599 			err = scrolld(view, offset);
9600 			*selected -= offset;
9601 		}
9602 	}
9603 
9604 	return err;
9605 }
9606 
9607 static void
9608 list_commands(FILE *fp)
9609 {
9610 	size_t i;
9611 
9612 	fprintf(fp, "commands:");
9613 	for (i = 0; i < nitems(tog_commands); i++) {
9614 		const struct tog_cmd *cmd = &tog_commands[i];
9615 		fprintf(fp, " %s", cmd->name);
9616 	}
9617 	fputc('\n', fp);
9618 }
9619 
9620 __dead static void
9621 usage(int hflag, int status)
9622 {
9623 	FILE *fp = (status == 0) ? stdout : stderr;
9624 
9625 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9626 	    getprogname());
9627 	if (hflag) {
9628 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9629 		list_commands(fp);
9630 	}
9631 	exit(status);
9632 }
9633 
9634 static char **
9635 make_argv(int argc, ...)
9636 {
9637 	va_list ap;
9638 	char **argv;
9639 	int i;
9640 
9641 	va_start(ap, argc);
9642 
9643 	argv = calloc(argc, sizeof(char *));
9644 	if (argv == NULL)
9645 		err(1, "calloc");
9646 	for (i = 0; i < argc; i++) {
9647 		argv[i] = strdup(va_arg(ap, char *));
9648 		if (argv[i] == NULL)
9649 			err(1, "strdup");
9650 	}
9651 
9652 	va_end(ap);
9653 	return argv;
9654 }
9655 
9656 /*
9657  * Try to convert 'tog path' into a 'tog log path' command.
9658  * The user could simply have mistyped the command rather than knowingly
9659  * provided a path. So check whether argv[0] can in fact be resolved
9660  * to a path in the HEAD commit and print a special error if not.
9661  * This hack is for mpi@ <3
9662  */
9663 static const struct got_error *
9664 tog_log_with_path(int argc, char *argv[])
9665 {
9666 	const struct got_error *error = NULL, *close_err;
9667 	const struct tog_cmd *cmd = NULL;
9668 	struct got_repository *repo = NULL;
9669 	struct got_worktree *worktree = NULL;
9670 	struct got_object_id *commit_id = NULL, *id = NULL;
9671 	struct got_commit_object *commit = NULL;
9672 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9673 	char *commit_id_str = NULL, **cmd_argv = NULL;
9674 	int *pack_fds = NULL;
9675 
9676 	cwd = getcwd(NULL, 0);
9677 	if (cwd == NULL)
9678 		return got_error_from_errno("getcwd");
9679 
9680 	error = got_repo_pack_fds_open(&pack_fds);
9681 	if (error != NULL)
9682 		goto done;
9683 
9684 	error = got_worktree_open(&worktree, cwd);
9685 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9686 		goto done;
9687 
9688 	if (worktree)
9689 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9690 	else
9691 		repo_path = strdup(cwd);
9692 	if (repo_path == NULL) {
9693 		error = got_error_from_errno("strdup");
9694 		goto done;
9695 	}
9696 
9697 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9698 	if (error != NULL)
9699 		goto done;
9700 
9701 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9702 	    repo, worktree);
9703 	if (error)
9704 		goto done;
9705 
9706 	error = tog_load_refs(repo, 0);
9707 	if (error)
9708 		goto done;
9709 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9710 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9711 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9712 	if (error)
9713 		goto done;
9714 
9715 	if (worktree) {
9716 		got_worktree_close(worktree);
9717 		worktree = NULL;
9718 	}
9719 
9720 	error = got_object_open_as_commit(&commit, repo, commit_id);
9721 	if (error)
9722 		goto done;
9723 
9724 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9725 	if (error) {
9726 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9727 			goto done;
9728 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9729 		    getprogname(), argv[0]);
9730 		usage(1, 1);
9731 		/* not reached */
9732 	}
9733 
9734 	error = got_object_id_str(&commit_id_str, commit_id);
9735 	if (error)
9736 		goto done;
9737 
9738 	cmd = &tog_commands[0]; /* log */
9739 	argc = 4;
9740 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9741 	error = cmd->cmd_main(argc, cmd_argv);
9742 done:
9743 	if (repo) {
9744 		close_err = got_repo_close(repo);
9745 		if (error == NULL)
9746 			error = close_err;
9747 	}
9748 	if (commit)
9749 		got_object_commit_close(commit);
9750 	if (worktree)
9751 		got_worktree_close(worktree);
9752 	if (pack_fds) {
9753 		const struct got_error *pack_err =
9754 		    got_repo_pack_fds_close(pack_fds);
9755 		if (error == NULL)
9756 			error = pack_err;
9757 	}
9758 	free(id);
9759 	free(commit_id_str);
9760 	free(commit_id);
9761 	free(cwd);
9762 	free(repo_path);
9763 	free(in_repo_path);
9764 	if (cmd_argv) {
9765 		int i;
9766 		for (i = 0; i < argc; i++)
9767 			free(cmd_argv[i]);
9768 		free(cmd_argv);
9769 	}
9770 	tog_free_refs();
9771 	return error;
9772 }
9773 
9774 int
9775 main(int argc, char *argv[])
9776 {
9777 	const struct got_error *io_err, *error = NULL;
9778 	const struct tog_cmd *cmd = NULL;
9779 	int ch, hflag = 0, Vflag = 0;
9780 	char **cmd_argv = NULL;
9781 	static const struct option longopts[] = {
9782 	    { "version", no_argument, NULL, 'V' },
9783 	    { NULL, 0, NULL, 0}
9784 	};
9785 	char *diff_algo_str = NULL;
9786 	const char *test_script_path;
9787 
9788 	setlocale(LC_CTYPE, "");
9789 
9790 	/*
9791 	 * Test mode init must happen before pledge() because "tty" will
9792 	 * not allow TTY-related ioctls to occur via regular files.
9793 	 */
9794 	test_script_path = getenv("TOG_TEST_SCRIPT");
9795 	if (test_script_path != NULL) {
9796 		error = init_mock_term(test_script_path);
9797 		if (error) {
9798 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9799 			return 1;
9800 		}
9801 	}
9802 
9803 #if !defined(PROFILE)
9804 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9805 	    NULL) == -1)
9806 		err(1, "pledge");
9807 #endif
9808 
9809 	if (!isatty(STDIN_FILENO))
9810 		errx(1, "standard input is not a tty");
9811 
9812 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9813 		switch (ch) {
9814 		case 'h':
9815 			hflag = 1;
9816 			break;
9817 		case 'V':
9818 			Vflag = 1;
9819 			break;
9820 		default:
9821 			usage(hflag, 1);
9822 			/* NOTREACHED */
9823 		}
9824 	}
9825 
9826 	argc -= optind;
9827 	argv += optind;
9828 	optind = 1;
9829 	optreset = 1;
9830 
9831 	if (Vflag) {
9832 		got_version_print_str();
9833 		return 0;
9834 	}
9835 
9836 	if (argc == 0) {
9837 		if (hflag)
9838 			usage(hflag, 0);
9839 		/* Build an argument vector which runs a default command. */
9840 		cmd = &tog_commands[0];
9841 		argc = 1;
9842 		cmd_argv = make_argv(argc, cmd->name);
9843 	} else {
9844 		size_t i;
9845 
9846 		/* Did the user specify a command? */
9847 		for (i = 0; i < nitems(tog_commands); i++) {
9848 			if (strncmp(tog_commands[i].name, argv[0],
9849 			    strlen(argv[0])) == 0) {
9850 				cmd = &tog_commands[i];
9851 				break;
9852 			}
9853 		}
9854 	}
9855 
9856 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9857 	if (diff_algo_str) {
9858 		if (strcasecmp(diff_algo_str, "patience") == 0)
9859 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9860 		if (strcasecmp(diff_algo_str, "myers") == 0)
9861 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9862 	}
9863 
9864 	if (cmd == NULL) {
9865 		if (argc != 1)
9866 			usage(0, 1);
9867 		/* No command specified; try log with a path */
9868 		error = tog_log_with_path(argc, argv);
9869 	} else {
9870 		if (hflag)
9871 			cmd->cmd_usage();
9872 		else
9873 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9874 	}
9875 
9876 	if (using_mock_io) {
9877 		io_err = tog_io_close();
9878 		if (error == NULL)
9879 			error = io_err;
9880 	}
9881 	endwin();
9882 	if (cmd_argv) {
9883 		int i;
9884 		for (i = 0; i < argc; i++)
9885 			free(cmd_argv[i]);
9886 		free(cmd_argv);
9887 	}
9888 
9889 	if (error && error->code != GOT_ERR_CANCELLED &&
9890 	    error->code != GOT_ERR_EOF &&
9891 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9892 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9893 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9894 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9895 	return 0;
9896 }