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 	int in;
4190 
4191 	if (test_script_path == NULL || *test_script_path == '\0')
4192 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4193 
4194 	tog_io.f = fopen(test_script_path, "re");
4195 	if (tog_io.f == NULL) {
4196 		err = got_error_from_errno_fmt("fopen: %s",
4197 		    test_script_path);
4198 		goto done;
4199 	}
4200 
4201 	/* test mode, we don't want any output */
4202 	tog_io.cout = fopen("/dev/null", "w+");
4203 	if (tog_io.cout == NULL) {
4204 		err = got_error_from_errno2("fopen", "/dev/null");
4205 		goto done;
4206 	}
4207 
4208 	in = dup(fileno(tog_io.cout));
4209 	if (in == -1) {
4210 		err = got_error_from_errno("dup");
4211 		goto done;
4212 	}
4213 	tog_io.cin = fdopen(in, "r");
4214 	if (tog_io.cin == NULL) {
4215 		err = got_error_from_errno("fdopen");
4216 		close(in);
4217 		goto done;
4218 	}
4219 
4220 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4221 		err = got_error_from_errno("fseeko");
4222 		goto done;
4223 	}
4224 
4225 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4226 		err = got_error_msg(GOT_ERR_IO,
4227 		    "newterm: failed to initialise curses");
4228 
4229 	using_mock_io = 1;
4230 
4231 done:
4232 	if (err)
4233 		tog_io_close();
4234 	return err;
4235 }
4236 
4237 static void
4238 init_curses(void)
4239 {
4240 	/*
4241 	 * Override default signal handlers before starting ncurses.
4242 	 * This should prevent ncurses from installing its own
4243 	 * broken cleanup() signal handler.
4244 	 */
4245 	signal(SIGWINCH, tog_sigwinch);
4246 	signal(SIGPIPE, tog_sigpipe);
4247 	signal(SIGCONT, tog_sigcont);
4248 	signal(SIGINT, tog_sigint);
4249 	signal(SIGTERM, tog_sigterm);
4250 
4251 	if (using_mock_io) /* In test mode we use a fake terminal */
4252 		return;
4253 
4254 	initscr();
4255 
4256 	cbreak();
4257 	halfdelay(1); /* Fast refresh while initial view is loading. */
4258 	noecho();
4259 	nonl();
4260 	intrflush(stdscr, FALSE);
4261 	keypad(stdscr, TRUE);
4262 	curs_set(0);
4263 	if (getenv("TOG_COLORS") != NULL) {
4264 		start_color();
4265 		use_default_colors();
4266 	}
4267 
4268 	return;
4269 }
4270 
4271 static const struct got_error *
4272 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4273     struct got_repository *repo, struct got_worktree *worktree)
4274 {
4275 	const struct got_error *err = NULL;
4276 
4277 	if (argc == 0) {
4278 		*in_repo_path = strdup("/");
4279 		if (*in_repo_path == NULL)
4280 			return got_error_from_errno("strdup");
4281 		return NULL;
4282 	}
4283 
4284 	if (worktree) {
4285 		const char *prefix = got_worktree_get_path_prefix(worktree);
4286 		char *p;
4287 
4288 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4289 		if (err)
4290 			return err;
4291 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4292 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4293 		    p) == -1) {
4294 			err = got_error_from_errno("asprintf");
4295 			*in_repo_path = NULL;
4296 		}
4297 		free(p);
4298 	} else
4299 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4300 
4301 	return err;
4302 }
4303 
4304 static const struct got_error *
4305 cmd_log(int argc, char *argv[])
4306 {
4307 	const struct got_error *error;
4308 	struct got_repository *repo = NULL;
4309 	struct got_worktree *worktree = NULL;
4310 	struct got_object_id *start_id = NULL;
4311 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4312 	char *start_commit = NULL, *label = NULL;
4313 	struct got_reference *ref = NULL;
4314 	const char *head_ref_name = NULL;
4315 	int ch, log_branches = 0;
4316 	struct tog_view *view;
4317 	int *pack_fds = NULL;
4318 
4319 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4320 		switch (ch) {
4321 		case 'b':
4322 			log_branches = 1;
4323 			break;
4324 		case 'c':
4325 			start_commit = optarg;
4326 			break;
4327 		case 'r':
4328 			repo_path = realpath(optarg, NULL);
4329 			if (repo_path == NULL)
4330 				return got_error_from_errno2("realpath",
4331 				    optarg);
4332 			break;
4333 		default:
4334 			usage_log();
4335 			/* NOTREACHED */
4336 		}
4337 	}
4338 
4339 	argc -= optind;
4340 	argv += optind;
4341 
4342 	if (argc > 1)
4343 		usage_log();
4344 
4345 	error = got_repo_pack_fds_open(&pack_fds);
4346 	if (error != NULL)
4347 		goto done;
4348 
4349 	if (repo_path == NULL) {
4350 		cwd = getcwd(NULL, 0);
4351 		if (cwd == NULL)
4352 			return got_error_from_errno("getcwd");
4353 		error = got_worktree_open(&worktree, cwd);
4354 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4355 			goto done;
4356 		if (worktree)
4357 			repo_path =
4358 			    strdup(got_worktree_get_repo_path(worktree));
4359 		else
4360 			repo_path = strdup(cwd);
4361 		if (repo_path == NULL) {
4362 			error = got_error_from_errno("strdup");
4363 			goto done;
4364 		}
4365 	}
4366 
4367 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4368 	if (error != NULL)
4369 		goto done;
4370 
4371 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4372 	    repo, worktree);
4373 	if (error)
4374 		goto done;
4375 
4376 	init_curses();
4377 
4378 	error = apply_unveil(got_repo_get_path(repo),
4379 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4380 	if (error)
4381 		goto done;
4382 
4383 	/* already loaded by tog_log_with_path()? */
4384 	if (TAILQ_EMPTY(&tog_refs)) {
4385 		error = tog_load_refs(repo, 0);
4386 		if (error)
4387 			goto done;
4388 	}
4389 
4390 	if (start_commit == NULL) {
4391 		error = got_repo_match_object_id(&start_id, &label,
4392 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4393 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4394 		if (error)
4395 			goto done;
4396 		head_ref_name = label;
4397 	} else {
4398 		error = got_ref_open(&ref, repo, start_commit, 0);
4399 		if (error == NULL)
4400 			head_ref_name = got_ref_get_name(ref);
4401 		else if (error->code != GOT_ERR_NOT_REF)
4402 			goto done;
4403 		error = got_repo_match_object_id(&start_id, NULL,
4404 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4405 		if (error)
4406 			goto done;
4407 	}
4408 
4409 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4410 	if (view == NULL) {
4411 		error = got_error_from_errno("view_open");
4412 		goto done;
4413 	}
4414 	error = open_log_view(view, start_id, repo, head_ref_name,
4415 	    in_repo_path, log_branches);
4416 	if (error)
4417 		goto done;
4418 	if (worktree) {
4419 		/* Release work tree lock. */
4420 		got_worktree_close(worktree);
4421 		worktree = NULL;
4422 	}
4423 	error = view_loop(view);
4424 done:
4425 	free(in_repo_path);
4426 	free(repo_path);
4427 	free(cwd);
4428 	free(start_id);
4429 	free(label);
4430 	if (ref)
4431 		got_ref_close(ref);
4432 	if (repo) {
4433 		const struct got_error *close_err = got_repo_close(repo);
4434 		if (error == NULL)
4435 			error = close_err;
4436 	}
4437 	if (worktree)
4438 		got_worktree_close(worktree);
4439 	if (pack_fds) {
4440 		const struct got_error *pack_err =
4441 		    got_repo_pack_fds_close(pack_fds);
4442 		if (error == NULL)
4443 			error = pack_err;
4444 	}
4445 	tog_free_refs();
4446 	return error;
4447 }
4448 
4449 __dead static void
4450 usage_diff(void)
4451 {
4452 	endwin();
4453 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4454 	    "object1 object2\n", getprogname());
4455 	exit(1);
4456 }
4457 
4458 static int
4459 match_line(const char *line, regex_t *regex, size_t nmatch,
4460     regmatch_t *regmatch)
4461 {
4462 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4463 }
4464 
4465 static struct tog_color *
4466 match_color(struct tog_colors *colors, const char *line)
4467 {
4468 	struct tog_color *tc = NULL;
4469 
4470 	STAILQ_FOREACH(tc, colors, entry) {
4471 		if (match_line(line, &tc->regex, 0, NULL))
4472 			return tc;
4473 	}
4474 
4475 	return NULL;
4476 }
4477 
4478 static const struct got_error *
4479 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4480     WINDOW *window, int skipcol, regmatch_t *regmatch)
4481 {
4482 	const struct got_error *err = NULL;
4483 	char *exstr = NULL;
4484 	wchar_t *wline = NULL;
4485 	int rme, rms, n, width, scrollx;
4486 	int width0 = 0, width1 = 0, width2 = 0;
4487 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4488 
4489 	*wtotal = 0;
4490 
4491 	rms = regmatch->rm_so;
4492 	rme = regmatch->rm_eo;
4493 
4494 	err = expand_tab(&exstr, line);
4495 	if (err)
4496 		return err;
4497 
4498 	/* Split the line into 3 segments, according to match offsets. */
4499 	seg0 = strndup(exstr, rms);
4500 	if (seg0 == NULL) {
4501 		err = got_error_from_errno("strndup");
4502 		goto done;
4503 	}
4504 	seg1 = strndup(exstr + rms, rme - rms);
4505 	if (seg1 == NULL) {
4506 		err = got_error_from_errno("strndup");
4507 		goto done;
4508 	}
4509 	seg2 = strdup(exstr + rme);
4510 	if (seg2 == NULL) {
4511 		err = got_error_from_errno("strndup");
4512 		goto done;
4513 	}
4514 
4515 	/* draw up to matched token if we haven't scrolled past it */
4516 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4517 	    col_tab_align, 1);
4518 	if (err)
4519 		goto done;
4520 	n = MAX(width0 - skipcol, 0);
4521 	if (n) {
4522 		free(wline);
4523 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4524 		    wlimit, col_tab_align, 1);
4525 		if (err)
4526 			goto done;
4527 		waddwstr(window, &wline[scrollx]);
4528 		wlimit -= width;
4529 		*wtotal += width;
4530 	}
4531 
4532 	if (wlimit > 0) {
4533 		int i = 0, w = 0;
4534 		size_t wlen;
4535 
4536 		free(wline);
4537 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4538 		    col_tab_align, 1);
4539 		if (err)
4540 			goto done;
4541 		wlen = wcslen(wline);
4542 		while (i < wlen) {
4543 			width = wcwidth(wline[i]);
4544 			if (width == -1) {
4545 				/* should not happen, tabs are expanded */
4546 				err = got_error(GOT_ERR_RANGE);
4547 				goto done;
4548 			}
4549 			if (width0 + w + width > skipcol)
4550 				break;
4551 			w += width;
4552 			i++;
4553 		}
4554 		/* draw (visible part of) matched token (if scrolled into it) */
4555 		if (width1 - w > 0) {
4556 			wattron(window, A_STANDOUT);
4557 			waddwstr(window, &wline[i]);
4558 			wattroff(window, A_STANDOUT);
4559 			wlimit -= (width1 - w);
4560 			*wtotal += (width1 - w);
4561 		}
4562 	}
4563 
4564 	if (wlimit > 0) {  /* draw rest of line */
4565 		free(wline);
4566 		if (skipcol > width0 + width1) {
4567 			err = format_line(&wline, &width2, &scrollx, seg2,
4568 			    skipcol - (width0 + width1), wlimit,
4569 			    col_tab_align, 1);
4570 			if (err)
4571 				goto done;
4572 			waddwstr(window, &wline[scrollx]);
4573 		} else {
4574 			err = format_line(&wline, &width2, NULL, seg2, 0,
4575 			    wlimit, col_tab_align, 1);
4576 			if (err)
4577 				goto done;
4578 			waddwstr(window, wline);
4579 		}
4580 		*wtotal += width2;
4581 	}
4582 done:
4583 	free(wline);
4584 	free(exstr);
4585 	free(seg0);
4586 	free(seg1);
4587 	free(seg2);
4588 	return err;
4589 }
4590 
4591 static int
4592 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4593 {
4594 	FILE	*f = NULL;
4595 	int	*eof, *first, *selected;
4596 
4597 	if (view->type == TOG_VIEW_DIFF) {
4598 		struct tog_diff_view_state *s = &view->state.diff;
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_HELP) {
4605 		struct tog_help_view_state *s = &view->state.help;
4606 
4607 		first = &s->first_displayed_line;
4608 		selected = first;
4609 		eof = &s->eof;
4610 		f = s->f;
4611 	} else if (view->type == TOG_VIEW_BLAME) {
4612 		struct tog_blame_view_state *s = &view->state.blame;
4613 
4614 		first = &s->first_displayed_line;
4615 		selected = &s->selected_line;
4616 		eof = &s->eof;
4617 		f = s->blame.f;
4618 	} else
4619 		return 0;
4620 
4621 	/* Center gline in the middle of the page like vi(1). */
4622 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4623 		return 0;
4624 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4625 		rewind(f);
4626 		*eof = 0;
4627 		*first = 1;
4628 		*lineno = 0;
4629 		*nprinted = 0;
4630 		return 0;
4631 	}
4632 
4633 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4634 		view->gline : (view->nlines - 3) / 2 + 1;
4635 	view->gline = 0;
4636 
4637 	return 1;
4638 }
4639 
4640 static const struct got_error *
4641 draw_file(struct tog_view *view, const char *header)
4642 {
4643 	struct tog_diff_view_state *s = &view->state.diff;
4644 	regmatch_t *regmatch = &view->regmatch;
4645 	const struct got_error *err;
4646 	int nprinted = 0;
4647 	char *line;
4648 	size_t linesize = 0;
4649 	ssize_t linelen;
4650 	wchar_t *wline;
4651 	int width;
4652 	int max_lines = view->nlines;
4653 	int nlines = s->nlines;
4654 	off_t line_offset;
4655 
4656 	s->lineno = s->first_displayed_line - 1;
4657 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4658 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4659 		return got_error_from_errno("fseek");
4660 
4661 	werase(view->window);
4662 
4663 	if (view->gline > s->nlines - 1)
4664 		view->gline = s->nlines - 1;
4665 
4666 	if (header) {
4667 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4668 		    1 : view->gline - (view->nlines - 3) / 2 :
4669 		    s->lineno + s->selected_line;
4670 
4671 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4672 			return got_error_from_errno("asprintf");
4673 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4674 		    0, 0);
4675 		free(line);
4676 		if (err)
4677 			return err;
4678 
4679 		if (view_needs_focus_indication(view))
4680 			wstandout(view->window);
4681 		waddwstr(view->window, wline);
4682 		free(wline);
4683 		wline = NULL;
4684 		while (width++ < view->ncols)
4685 			waddch(view->window, ' ');
4686 		if (view_needs_focus_indication(view))
4687 			wstandend(view->window);
4688 
4689 		if (max_lines <= 1)
4690 			return NULL;
4691 		max_lines--;
4692 	}
4693 
4694 	s->eof = 0;
4695 	view->maxx = 0;
4696 	line = NULL;
4697 	while (max_lines > 0 && nprinted < max_lines) {
4698 		enum got_diff_line_type linetype;
4699 		attr_t attr = 0;
4700 
4701 		linelen = getline(&line, &linesize, s->f);
4702 		if (linelen == -1) {
4703 			if (feof(s->f)) {
4704 				s->eof = 1;
4705 				break;
4706 			}
4707 			free(line);
4708 			return got_ferror(s->f, GOT_ERR_IO);
4709 		}
4710 
4711 		if (++s->lineno < s->first_displayed_line)
4712 			continue;
4713 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4714 			continue;
4715 		if (s->lineno == view->hiline)
4716 			attr = A_STANDOUT;
4717 
4718 		/* Set view->maxx based on full line length. */
4719 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4720 		    view->x ? 1 : 0);
4721 		if (err) {
4722 			free(line);
4723 			return err;
4724 		}
4725 		view->maxx = MAX(view->maxx, width);
4726 		free(wline);
4727 		wline = NULL;
4728 
4729 		linetype = s->lines[s->lineno].type;
4730 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4731 		    linetype < GOT_DIFF_LINE_CONTEXT)
4732 			attr |= COLOR_PAIR(linetype);
4733 		if (attr)
4734 			wattron(view->window, attr);
4735 		if (s->first_displayed_line + nprinted == s->matched_line &&
4736 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4737 			err = add_matched_line(&width, line, view->ncols, 0,
4738 			    view->window, view->x, regmatch);
4739 			if (err) {
4740 				free(line);
4741 				return err;
4742 			}
4743 		} else {
4744 			int skip;
4745 			err = format_line(&wline, &width, &skip, line,
4746 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4747 			if (err) {
4748 				free(line);
4749 				return err;
4750 			}
4751 			waddwstr(view->window, &wline[skip]);
4752 			free(wline);
4753 			wline = NULL;
4754 		}
4755 		if (s->lineno == view->hiline) {
4756 			/* highlight full gline length */
4757 			while (width++ < view->ncols)
4758 				waddch(view->window, ' ');
4759 		} else {
4760 			if (width <= view->ncols - 1)
4761 				waddch(view->window, '\n');
4762 		}
4763 		if (attr)
4764 			wattroff(view->window, attr);
4765 		if (++nprinted == 1)
4766 			s->first_displayed_line = s->lineno;
4767 	}
4768 	free(line);
4769 	if (nprinted >= 1)
4770 		s->last_displayed_line = s->first_displayed_line +
4771 		    (nprinted - 1);
4772 	else
4773 		s->last_displayed_line = s->first_displayed_line;
4774 
4775 	view_border(view);
4776 
4777 	if (s->eof) {
4778 		while (nprinted < view->nlines) {
4779 			waddch(view->window, '\n');
4780 			nprinted++;
4781 		}
4782 
4783 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4784 		    view->ncols, 0, 0);
4785 		if (err) {
4786 			return err;
4787 		}
4788 
4789 		wstandout(view->window);
4790 		waddwstr(view->window, wline);
4791 		free(wline);
4792 		wline = NULL;
4793 		wstandend(view->window);
4794 	}
4795 
4796 	return NULL;
4797 }
4798 
4799 static char *
4800 get_datestr(time_t *time, char *datebuf)
4801 {
4802 	struct tm mytm, *tm;
4803 	char *p, *s;
4804 
4805 	tm = gmtime_r(time, &mytm);
4806 	if (tm == NULL)
4807 		return NULL;
4808 	s = asctime_r(tm, datebuf);
4809 	if (s == NULL)
4810 		return NULL;
4811 	p = strchr(s, '\n');
4812 	if (p)
4813 		*p = '\0';
4814 	return s;
4815 }
4816 
4817 static const struct got_error *
4818 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4819     off_t off, uint8_t type)
4820 {
4821 	struct got_diff_line *p;
4822 
4823 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4824 	if (p == NULL)
4825 		return got_error_from_errno("reallocarray");
4826 	*lines = p;
4827 	(*lines)[*nlines].offset = off;
4828 	(*lines)[*nlines].type = type;
4829 	(*nlines)++;
4830 
4831 	return NULL;
4832 }
4833 
4834 static const struct got_error *
4835 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4836     struct got_diff_line *s_lines, size_t s_nlines)
4837 {
4838 	struct got_diff_line	*p;
4839 	char			 buf[BUFSIZ];
4840 	size_t			 i, r;
4841 
4842 	if (fseeko(src, 0L, SEEK_SET) == -1)
4843 		return got_error_from_errno("fseeko");
4844 
4845 	for (;;) {
4846 		r = fread(buf, 1, sizeof(buf), src);
4847 		if (r == 0) {
4848 			if (ferror(src))
4849 				return got_error_from_errno("fread");
4850 			if (feof(src))
4851 				break;
4852 		}
4853 		if (fwrite(buf, 1, r, dst) != r)
4854 			return got_ferror(dst, GOT_ERR_IO);
4855 	}
4856 
4857 	if (s_nlines == 0 && *d_nlines == 0)
4858 		return NULL;
4859 
4860 	/*
4861 	 * If commit info was in dst, increment line offsets
4862 	 * of the appended diff content, but skip s_lines[0]
4863 	 * because offset zero is already in *d_lines.
4864 	 */
4865 	if (*d_nlines > 0) {
4866 		for (i = 1; i < s_nlines; ++i)
4867 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4868 
4869 		if (s_nlines > 0) {
4870 			--s_nlines;
4871 			++s_lines;
4872 		}
4873 	}
4874 
4875 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4876 	if (p == NULL) {
4877 		/* d_lines is freed in close_diff_view() */
4878 		return got_error_from_errno("reallocarray");
4879 	}
4880 
4881 	*d_lines = p;
4882 
4883 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4884 	*d_nlines += s_nlines;
4885 
4886 	return NULL;
4887 }
4888 
4889 static const struct got_error *
4890 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4891     struct got_object_id *commit_id, struct got_reflist_head *refs,
4892     struct got_repository *repo, int ignore_ws, int force_text_diff,
4893     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4894 {
4895 	const struct got_error *err = NULL;
4896 	char datebuf[26], *datestr;
4897 	struct got_commit_object *commit;
4898 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4899 	time_t committer_time;
4900 	const char *author, *committer;
4901 	char *refs_str = NULL;
4902 	struct got_pathlist_entry *pe;
4903 	off_t outoff = 0;
4904 	int n;
4905 
4906 	if (refs) {
4907 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4908 		if (err)
4909 			return err;
4910 	}
4911 
4912 	err = got_object_open_as_commit(&commit, repo, commit_id);
4913 	if (err)
4914 		return err;
4915 
4916 	err = got_object_id_str(&id_str, commit_id);
4917 	if (err) {
4918 		err = got_error_from_errno("got_object_id_str");
4919 		goto done;
4920 	}
4921 
4922 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4923 	if (err)
4924 		goto done;
4925 
4926 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4927 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4928 	if (n < 0) {
4929 		err = got_error_from_errno("fprintf");
4930 		goto done;
4931 	}
4932 	outoff += n;
4933 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4934 	if (err)
4935 		goto done;
4936 
4937 	n = fprintf(outfile, "from: %s\n",
4938 	    got_object_commit_get_author(commit));
4939 	if (n < 0) {
4940 		err = got_error_from_errno("fprintf");
4941 		goto done;
4942 	}
4943 	outoff += n;
4944 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4945 	if (err)
4946 		goto done;
4947 
4948 	author = got_object_commit_get_author(commit);
4949 	committer = got_object_commit_get_committer(commit);
4950 	if (strcmp(author, committer) != 0) {
4951 		n = fprintf(outfile, "via: %s\n", committer);
4952 		if (n < 0) {
4953 			err = got_error_from_errno("fprintf");
4954 			goto done;
4955 		}
4956 		outoff += n;
4957 		err = add_line_metadata(lines, nlines, outoff,
4958 		    GOT_DIFF_LINE_AUTHOR);
4959 		if (err)
4960 			goto done;
4961 	}
4962 	committer_time = got_object_commit_get_committer_time(commit);
4963 	datestr = get_datestr(&committer_time, datebuf);
4964 	if (datestr) {
4965 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4966 		if (n < 0) {
4967 			err = got_error_from_errno("fprintf");
4968 			goto done;
4969 		}
4970 		outoff += n;
4971 		err = add_line_metadata(lines, nlines, outoff,
4972 		    GOT_DIFF_LINE_DATE);
4973 		if (err)
4974 			goto done;
4975 	}
4976 	if (got_object_commit_get_nparents(commit) > 1) {
4977 		const struct got_object_id_queue *parent_ids;
4978 		struct got_object_qid *qid;
4979 		int pn = 1;
4980 		parent_ids = got_object_commit_get_parent_ids(commit);
4981 		STAILQ_FOREACH(qid, parent_ids, entry) {
4982 			err = got_object_id_str(&id_str, &qid->id);
4983 			if (err)
4984 				goto done;
4985 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4986 			if (n < 0) {
4987 				err = got_error_from_errno("fprintf");
4988 				goto done;
4989 			}
4990 			outoff += n;
4991 			err = add_line_metadata(lines, nlines, outoff,
4992 			    GOT_DIFF_LINE_META);
4993 			if (err)
4994 				goto done;
4995 			free(id_str);
4996 			id_str = NULL;
4997 		}
4998 	}
4999 
5000 	err = got_object_commit_get_logmsg(&logmsg, commit);
5001 	if (err)
5002 		goto done;
5003 	s = logmsg;
5004 	while ((line = strsep(&s, "\n")) != NULL) {
5005 		n = fprintf(outfile, "%s\n", line);
5006 		if (n < 0) {
5007 			err = got_error_from_errno("fprintf");
5008 			goto done;
5009 		}
5010 		outoff += n;
5011 		err = add_line_metadata(lines, nlines, outoff,
5012 		    GOT_DIFF_LINE_LOGMSG);
5013 		if (err)
5014 			goto done;
5015 	}
5016 
5017 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5018 		struct got_diff_changed_path *cp = pe->data;
5019 		int pad = dsa->max_path_len - pe->path_len + 1;
5020 
5021 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5022 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5023 		    dsa->rm_cols + 1, cp->rm);
5024 		if (n < 0) {
5025 			err = got_error_from_errno("fprintf");
5026 			goto done;
5027 		}
5028 		outoff += n;
5029 		err = add_line_metadata(lines, nlines, outoff,
5030 		    GOT_DIFF_LINE_CHANGES);
5031 		if (err)
5032 			goto done;
5033 	}
5034 
5035 	fputc('\n', outfile);
5036 	outoff++;
5037 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5038 	if (err)
5039 		goto done;
5040 
5041 	n = fprintf(outfile,
5042 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5043 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5044 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5045 	if (n < 0) {
5046 		err = got_error_from_errno("fprintf");
5047 		goto done;
5048 	}
5049 	outoff += n;
5050 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5051 	if (err)
5052 		goto done;
5053 
5054 	fputc('\n', outfile);
5055 	outoff++;
5056 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5057 done:
5058 	free(id_str);
5059 	free(logmsg);
5060 	free(refs_str);
5061 	got_object_commit_close(commit);
5062 	if (err) {
5063 		free(*lines);
5064 		*lines = NULL;
5065 		*nlines = 0;
5066 	}
5067 	return err;
5068 }
5069 
5070 static const struct got_error *
5071 create_diff(struct tog_diff_view_state *s)
5072 {
5073 	const struct got_error *err = NULL;
5074 	FILE *f = NULL, *tmp_diff_file = NULL;
5075 	int obj_type;
5076 	struct got_diff_line *lines = NULL;
5077 	struct got_pathlist_head changed_paths;
5078 
5079 	TAILQ_INIT(&changed_paths);
5080 
5081 	free(s->lines);
5082 	s->lines = malloc(sizeof(*s->lines));
5083 	if (s->lines == NULL)
5084 		return got_error_from_errno("malloc");
5085 	s->nlines = 0;
5086 
5087 	f = got_opentemp();
5088 	if (f == NULL) {
5089 		err = got_error_from_errno("got_opentemp");
5090 		goto done;
5091 	}
5092 	tmp_diff_file = got_opentemp();
5093 	if (tmp_diff_file == NULL) {
5094 		err = got_error_from_errno("got_opentemp");
5095 		goto done;
5096 	}
5097 	if (s->f && fclose(s->f) == EOF) {
5098 		err = got_error_from_errno("fclose");
5099 		goto done;
5100 	}
5101 	s->f = f;
5102 
5103 	if (s->id1)
5104 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5105 	else
5106 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5107 	if (err)
5108 		goto done;
5109 
5110 	switch (obj_type) {
5111 	case GOT_OBJ_TYPE_BLOB:
5112 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5113 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5114 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5115 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5116 		    s->f);
5117 		break;
5118 	case GOT_OBJ_TYPE_TREE:
5119 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5120 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5121 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5122 		    s->force_text_diff, NULL, s->repo, s->f);
5123 		break;
5124 	case GOT_OBJ_TYPE_COMMIT: {
5125 		const struct got_object_id_queue *parent_ids;
5126 		struct got_object_qid *pid;
5127 		struct got_commit_object *commit2;
5128 		struct got_reflist_head *refs;
5129 		size_t nlines = 0;
5130 		struct got_diffstat_cb_arg dsa = {
5131 			0, 0, 0, 0, 0, 0,
5132 			&changed_paths,
5133 			s->ignore_whitespace,
5134 			s->force_text_diff,
5135 			tog_diff_algo
5136 		};
5137 
5138 		lines = malloc(sizeof(*lines));
5139 		if (lines == NULL) {
5140 			err = got_error_from_errno("malloc");
5141 			goto done;
5142 		}
5143 
5144 		/* build diff first in tmp file then append to commit info */
5145 		err = got_diff_objects_as_commits(&lines, &nlines,
5146 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5147 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5148 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5149 		if (err)
5150 			break;
5151 
5152 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5153 		if (err)
5154 			goto done;
5155 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5156 		/* Show commit info if we're diffing to a parent/root commit. */
5157 		if (s->id1 == NULL) {
5158 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5159 			    refs, s->repo, s->ignore_whitespace,
5160 			    s->force_text_diff, &dsa, s->f);
5161 			if (err)
5162 				goto done;
5163 		} else {
5164 			parent_ids = got_object_commit_get_parent_ids(commit2);
5165 			STAILQ_FOREACH(pid, parent_ids, entry) {
5166 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5167 					err = write_commit_info(&s->lines,
5168 					    &s->nlines, s->id2, refs, s->repo,
5169 					    s->ignore_whitespace,
5170 					    s->force_text_diff, &dsa, s->f);
5171 					if (err)
5172 						goto done;
5173 					break;
5174 				}
5175 			}
5176 		}
5177 		got_object_commit_close(commit2);
5178 
5179 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5180 		    lines, nlines);
5181 		break;
5182 	}
5183 	default:
5184 		err = got_error(GOT_ERR_OBJ_TYPE);
5185 		break;
5186 	}
5187 done:
5188 	free(lines);
5189 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5190 	if (s->f && fflush(s->f) != 0 && err == NULL)
5191 		err = got_error_from_errno("fflush");
5192 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5193 		err = got_error_from_errno("fclose");
5194 	return err;
5195 }
5196 
5197 static void
5198 diff_view_indicate_progress(struct tog_view *view)
5199 {
5200 	mvwaddstr(view->window, 0, 0, "diffing...");
5201 	update_panels();
5202 	doupdate();
5203 }
5204 
5205 static const struct got_error *
5206 search_start_diff_view(struct tog_view *view)
5207 {
5208 	struct tog_diff_view_state *s = &view->state.diff;
5209 
5210 	s->matched_line = 0;
5211 	return NULL;
5212 }
5213 
5214 static void
5215 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5216     size_t *nlines, int **first, int **last, int **match, int **selected)
5217 {
5218 	struct tog_diff_view_state *s = &view->state.diff;
5219 
5220 	*f = s->f;
5221 	*nlines = s->nlines;
5222 	*line_offsets = NULL;
5223 	*match = &s->matched_line;
5224 	*first = &s->first_displayed_line;
5225 	*last = &s->last_displayed_line;
5226 	*selected = &s->selected_line;
5227 }
5228 
5229 static const struct got_error *
5230 search_next_view_match(struct tog_view *view)
5231 {
5232 	const struct got_error *err = NULL;
5233 	FILE *f;
5234 	int lineno;
5235 	char *line = NULL;
5236 	size_t linesize = 0;
5237 	ssize_t linelen;
5238 	off_t *line_offsets;
5239 	size_t nlines = 0;
5240 	int *first, *last, *match, *selected;
5241 
5242 	if (!view->search_setup)
5243 		return got_error_msg(GOT_ERR_NOT_IMPL,
5244 		    "view search not supported");
5245 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5246 	    &match, &selected);
5247 
5248 	if (!view->searching) {
5249 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5250 		return NULL;
5251 	}
5252 
5253 	if (*match) {
5254 		if (view->searching == TOG_SEARCH_FORWARD)
5255 			lineno = *first + 1;
5256 		else
5257 			lineno = *first - 1;
5258 	} else
5259 		lineno = *first - 1 + *selected;
5260 
5261 	while (1) {
5262 		off_t offset;
5263 
5264 		if (lineno <= 0 || lineno > nlines) {
5265 			if (*match == 0) {
5266 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5267 				break;
5268 			}
5269 
5270 			if (view->searching == TOG_SEARCH_FORWARD)
5271 				lineno = 1;
5272 			else
5273 				lineno = nlines;
5274 		}
5275 
5276 		offset = view->type == TOG_VIEW_DIFF ?
5277 		    view->state.diff.lines[lineno - 1].offset :
5278 		    line_offsets[lineno - 1];
5279 		if (fseeko(f, offset, SEEK_SET) != 0) {
5280 			free(line);
5281 			return got_error_from_errno("fseeko");
5282 		}
5283 		linelen = getline(&line, &linesize, f);
5284 		if (linelen != -1) {
5285 			char *exstr;
5286 			err = expand_tab(&exstr, line);
5287 			if (err)
5288 				break;
5289 			if (match_line(exstr, &view->regex, 1,
5290 			    &view->regmatch)) {
5291 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5292 				*match = lineno;
5293 				free(exstr);
5294 				break;
5295 			}
5296 			free(exstr);
5297 		}
5298 		if (view->searching == TOG_SEARCH_FORWARD)
5299 			lineno++;
5300 		else
5301 			lineno--;
5302 	}
5303 	free(line);
5304 
5305 	if (*match) {
5306 		*first = *match;
5307 		*selected = 1;
5308 	}
5309 
5310 	return err;
5311 }
5312 
5313 static const struct got_error *
5314 close_diff_view(struct tog_view *view)
5315 {
5316 	const struct got_error *err = NULL;
5317 	struct tog_diff_view_state *s = &view->state.diff;
5318 
5319 	free(s->id1);
5320 	s->id1 = NULL;
5321 	free(s->id2);
5322 	s->id2 = NULL;
5323 	if (s->f && fclose(s->f) == EOF)
5324 		err = got_error_from_errno("fclose");
5325 	s->f = NULL;
5326 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5327 		err = got_error_from_errno("fclose");
5328 	s->f1 = NULL;
5329 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5330 		err = got_error_from_errno("fclose");
5331 	s->f2 = NULL;
5332 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5333 		err = got_error_from_errno("close");
5334 	s->fd1 = -1;
5335 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5336 		err = got_error_from_errno("close");
5337 	s->fd2 = -1;
5338 	free(s->lines);
5339 	s->lines = NULL;
5340 	s->nlines = 0;
5341 	return err;
5342 }
5343 
5344 static const struct got_error *
5345 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5346     struct got_object_id *id2, const char *label1, const char *label2,
5347     int diff_context, int ignore_whitespace, int force_text_diff,
5348     struct tog_view *parent_view, struct got_repository *repo)
5349 {
5350 	const struct got_error *err;
5351 	struct tog_diff_view_state *s = &view->state.diff;
5352 
5353 	memset(s, 0, sizeof(*s));
5354 	s->fd1 = -1;
5355 	s->fd2 = -1;
5356 
5357 	if (id1 != NULL && id2 != NULL) {
5358 		int type1, type2;
5359 
5360 		err = got_object_get_type(&type1, repo, id1);
5361 		if (err)
5362 			goto done;
5363 		err = got_object_get_type(&type2, repo, id2);
5364 		if (err)
5365 			goto done;
5366 
5367 		if (type1 != type2) {
5368 			err = got_error(GOT_ERR_OBJ_TYPE);
5369 			goto done;
5370 		}
5371 	}
5372 	s->first_displayed_line = 1;
5373 	s->last_displayed_line = view->nlines;
5374 	s->selected_line = 1;
5375 	s->repo = repo;
5376 	s->id1 = id1;
5377 	s->id2 = id2;
5378 	s->label1 = label1;
5379 	s->label2 = label2;
5380 
5381 	if (id1) {
5382 		s->id1 = got_object_id_dup(id1);
5383 		if (s->id1 == NULL) {
5384 			err = got_error_from_errno("got_object_id_dup");
5385 			goto done;
5386 		}
5387 	} else
5388 		s->id1 = NULL;
5389 
5390 	s->id2 = got_object_id_dup(id2);
5391 	if (s->id2 == NULL) {
5392 		err = got_error_from_errno("got_object_id_dup");
5393 		goto done;
5394 	}
5395 
5396 	s->f1 = got_opentemp();
5397 	if (s->f1 == NULL) {
5398 		err = got_error_from_errno("got_opentemp");
5399 		goto done;
5400 	}
5401 
5402 	s->f2 = got_opentemp();
5403 	if (s->f2 == NULL) {
5404 		err = got_error_from_errno("got_opentemp");
5405 		goto done;
5406 	}
5407 
5408 	s->fd1 = got_opentempfd();
5409 	if (s->fd1 == -1) {
5410 		err = got_error_from_errno("got_opentempfd");
5411 		goto done;
5412 	}
5413 
5414 	s->fd2 = got_opentempfd();
5415 	if (s->fd2 == -1) {
5416 		err = got_error_from_errno("got_opentempfd");
5417 		goto done;
5418 	}
5419 
5420 	s->diff_context = diff_context;
5421 	s->ignore_whitespace = ignore_whitespace;
5422 	s->force_text_diff = force_text_diff;
5423 	s->parent_view = parent_view;
5424 	s->repo = repo;
5425 
5426 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5427 		int rc;
5428 
5429 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5430 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5431 		if (rc != ERR)
5432 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5433 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5434 		if (rc != ERR)
5435 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5436 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5437 		if (rc != ERR)
5438 			rc = init_pair(GOT_DIFF_LINE_META,
5439 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5440 		if (rc != ERR)
5441 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5442 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5443 		if (rc != ERR)
5444 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5445 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5446 		if (rc != ERR)
5447 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5448 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5449 		if (rc != ERR)
5450 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5451 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5452 		if (rc != ERR)
5453 			rc = init_pair(GOT_DIFF_LINE_DATE,
5454 			    get_color_value("TOG_COLOR_DATE"), -1);
5455 		if (rc == ERR) {
5456 			err = got_error(GOT_ERR_RANGE);
5457 			goto done;
5458 		}
5459 	}
5460 
5461 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5462 	    view_is_splitscreen(view))
5463 		show_log_view(parent_view); /* draw border */
5464 	diff_view_indicate_progress(view);
5465 
5466 	err = create_diff(s);
5467 
5468 	view->show = show_diff_view;
5469 	view->input = input_diff_view;
5470 	view->reset = reset_diff_view;
5471 	view->close = close_diff_view;
5472 	view->search_start = search_start_diff_view;
5473 	view->search_setup = search_setup_diff_view;
5474 	view->search_next = search_next_view_match;
5475 done:
5476 	if (err) {
5477 		if (view->close == NULL)
5478 			close_diff_view(view);
5479 		view_close(view);
5480 	}
5481 	return err;
5482 }
5483 
5484 static const struct got_error *
5485 show_diff_view(struct tog_view *view)
5486 {
5487 	const struct got_error *err;
5488 	struct tog_diff_view_state *s = &view->state.diff;
5489 	char *id_str1 = NULL, *id_str2, *header;
5490 	const char *label1, *label2;
5491 
5492 	if (s->id1) {
5493 		err = got_object_id_str(&id_str1, s->id1);
5494 		if (err)
5495 			return err;
5496 		label1 = s->label1 ? s->label1 : id_str1;
5497 	} else
5498 		label1 = "/dev/null";
5499 
5500 	err = got_object_id_str(&id_str2, s->id2);
5501 	if (err)
5502 		return err;
5503 	label2 = s->label2 ? s->label2 : id_str2;
5504 
5505 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5506 		err = got_error_from_errno("asprintf");
5507 		free(id_str1);
5508 		free(id_str2);
5509 		return err;
5510 	}
5511 	free(id_str1);
5512 	free(id_str2);
5513 
5514 	err = draw_file(view, header);
5515 	free(header);
5516 	return err;
5517 }
5518 
5519 static const struct got_error *
5520 set_selected_commit(struct tog_diff_view_state *s,
5521     struct commit_queue_entry *entry)
5522 {
5523 	const struct got_error *err;
5524 	const struct got_object_id_queue *parent_ids;
5525 	struct got_commit_object *selected_commit;
5526 	struct got_object_qid *pid;
5527 
5528 	free(s->id2);
5529 	s->id2 = got_object_id_dup(entry->id);
5530 	if (s->id2 == NULL)
5531 		return got_error_from_errno("got_object_id_dup");
5532 
5533 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5534 	if (err)
5535 		return err;
5536 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5537 	free(s->id1);
5538 	pid = STAILQ_FIRST(parent_ids);
5539 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5540 	got_object_commit_close(selected_commit);
5541 	return NULL;
5542 }
5543 
5544 static const struct got_error *
5545 reset_diff_view(struct tog_view *view)
5546 {
5547 	struct tog_diff_view_state *s = &view->state.diff;
5548 
5549 	view->count = 0;
5550 	wclear(view->window);
5551 	s->first_displayed_line = 1;
5552 	s->last_displayed_line = view->nlines;
5553 	s->matched_line = 0;
5554 	diff_view_indicate_progress(view);
5555 	return create_diff(s);
5556 }
5557 
5558 static void
5559 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5560 {
5561 	int start, i;
5562 
5563 	i = start = s->first_displayed_line - 1;
5564 
5565 	while (s->lines[i].type != type) {
5566 		if (i == 0)
5567 			i = s->nlines - 1;
5568 		if (--i == start)
5569 			return; /* do nothing, requested type not in file */
5570 	}
5571 
5572 	s->selected_line = 1;
5573 	s->first_displayed_line = i;
5574 }
5575 
5576 static void
5577 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5578 {
5579 	int start, i;
5580 
5581 	i = start = s->first_displayed_line + 1;
5582 
5583 	while (s->lines[i].type != type) {
5584 		if (i == s->nlines - 1)
5585 			i = 0;
5586 		if (++i == start)
5587 			return; /* do nothing, requested type not in file */
5588 	}
5589 
5590 	s->selected_line = 1;
5591 	s->first_displayed_line = i;
5592 }
5593 
5594 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5595     int, int, int);
5596 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5597     int, int);
5598 
5599 static const struct got_error *
5600 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5601 {
5602 	const struct got_error *err = NULL;
5603 	struct tog_diff_view_state *s = &view->state.diff;
5604 	struct tog_log_view_state *ls;
5605 	struct commit_queue_entry *old_selected_entry;
5606 	char *line = NULL;
5607 	size_t linesize = 0;
5608 	ssize_t linelen;
5609 	int i, nscroll = view->nlines - 1, up = 0;
5610 
5611 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5612 
5613 	switch (ch) {
5614 	case '0':
5615 	case '$':
5616 	case KEY_RIGHT:
5617 	case 'l':
5618 	case KEY_LEFT:
5619 	case 'h':
5620 		horizontal_scroll_input(view, ch);
5621 		break;
5622 	case 'a':
5623 	case 'w':
5624 		if (ch == 'a') {
5625 			s->force_text_diff = !s->force_text_diff;
5626 			view->action = s->force_text_diff ?
5627 			    "force ASCII text enabled" :
5628 			    "force ASCII text disabled";
5629 		}
5630 		else if (ch == 'w') {
5631 			s->ignore_whitespace = !s->ignore_whitespace;
5632 			view->action = s->ignore_whitespace ?
5633 			    "ignore whitespace enabled" :
5634 			    "ignore whitespace disabled";
5635 		}
5636 		err = reset_diff_view(view);
5637 		break;
5638 	case 'g':
5639 	case KEY_HOME:
5640 		s->first_displayed_line = 1;
5641 		view->count = 0;
5642 		break;
5643 	case 'G':
5644 	case KEY_END:
5645 		view->count = 0;
5646 		if (s->eof)
5647 			break;
5648 
5649 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5650 		s->eof = 1;
5651 		break;
5652 	case 'k':
5653 	case KEY_UP:
5654 	case CTRL('p'):
5655 		if (s->first_displayed_line > 1)
5656 			s->first_displayed_line--;
5657 		else
5658 			view->count = 0;
5659 		break;
5660 	case CTRL('u'):
5661 	case 'u':
5662 		nscroll /= 2;
5663 		/* FALL THROUGH */
5664 	case KEY_PPAGE:
5665 	case CTRL('b'):
5666 	case 'b':
5667 		if (s->first_displayed_line == 1) {
5668 			view->count = 0;
5669 			break;
5670 		}
5671 		i = 0;
5672 		while (i++ < nscroll && s->first_displayed_line > 1)
5673 			s->first_displayed_line--;
5674 		break;
5675 	case 'j':
5676 	case KEY_DOWN:
5677 	case CTRL('n'):
5678 		if (!s->eof)
5679 			s->first_displayed_line++;
5680 		else
5681 			view->count = 0;
5682 		break;
5683 	case CTRL('d'):
5684 	case 'd':
5685 		nscroll /= 2;
5686 		/* FALL THROUGH */
5687 	case KEY_NPAGE:
5688 	case CTRL('f'):
5689 	case 'f':
5690 	case ' ':
5691 		if (s->eof) {
5692 			view->count = 0;
5693 			break;
5694 		}
5695 		i = 0;
5696 		while (!s->eof && i++ < nscroll) {
5697 			linelen = getline(&line, &linesize, s->f);
5698 			s->first_displayed_line++;
5699 			if (linelen == -1) {
5700 				if (feof(s->f)) {
5701 					s->eof = 1;
5702 				} else
5703 					err = got_ferror(s->f, GOT_ERR_IO);
5704 				break;
5705 			}
5706 		}
5707 		free(line);
5708 		break;
5709 	case '(':
5710 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5711 		break;
5712 	case ')':
5713 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5714 		break;
5715 	case '{':
5716 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5717 		break;
5718 	case '}':
5719 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5720 		break;
5721 	case '[':
5722 		if (s->diff_context > 0) {
5723 			s->diff_context--;
5724 			s->matched_line = 0;
5725 			diff_view_indicate_progress(view);
5726 			err = create_diff(s);
5727 			if (s->first_displayed_line + view->nlines - 1 >
5728 			    s->nlines) {
5729 				s->first_displayed_line = 1;
5730 				s->last_displayed_line = view->nlines;
5731 			}
5732 		} else
5733 			view->count = 0;
5734 		break;
5735 	case ']':
5736 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5737 			s->diff_context++;
5738 			s->matched_line = 0;
5739 			diff_view_indicate_progress(view);
5740 			err = create_diff(s);
5741 		} else
5742 			view->count = 0;
5743 		break;
5744 	case '<':
5745 	case ',':
5746 	case 'K':
5747 		up = 1;
5748 		/* FALL THROUGH */
5749 	case '>':
5750 	case '.':
5751 	case 'J':
5752 		if (s->parent_view == NULL) {
5753 			view->count = 0;
5754 			break;
5755 		}
5756 		s->parent_view->count = view->count;
5757 
5758 		if (s->parent_view->type == TOG_VIEW_LOG) {
5759 			ls = &s->parent_view->state.log;
5760 			old_selected_entry = ls->selected_entry;
5761 
5762 			err = input_log_view(NULL, s->parent_view,
5763 			    up ? KEY_UP : KEY_DOWN);
5764 			if (err)
5765 				break;
5766 			view->count = s->parent_view->count;
5767 
5768 			if (old_selected_entry == ls->selected_entry)
5769 				break;
5770 
5771 			err = set_selected_commit(s, ls->selected_entry);
5772 			if (err)
5773 				break;
5774 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5775 			struct tog_blame_view_state *bs;
5776 			struct got_object_id *id, *prev_id;
5777 
5778 			bs = &s->parent_view->state.blame;
5779 			prev_id = get_annotation_for_line(bs->blame.lines,
5780 			    bs->blame.nlines, bs->last_diffed_line);
5781 
5782 			err = input_blame_view(&view, s->parent_view,
5783 			    up ? KEY_UP : KEY_DOWN);
5784 			if (err)
5785 				break;
5786 			view->count = s->parent_view->count;
5787 
5788 			if (prev_id == NULL)
5789 				break;
5790 			id = get_selected_commit_id(bs->blame.lines,
5791 			    bs->blame.nlines, bs->first_displayed_line,
5792 			    bs->selected_line);
5793 			if (id == NULL)
5794 				break;
5795 
5796 			if (!got_object_id_cmp(prev_id, id))
5797 				break;
5798 
5799 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5800 			if (err)
5801 				break;
5802 		}
5803 		s->first_displayed_line = 1;
5804 		s->last_displayed_line = view->nlines;
5805 		s->matched_line = 0;
5806 		view->x = 0;
5807 
5808 		diff_view_indicate_progress(view);
5809 		err = create_diff(s);
5810 		break;
5811 	default:
5812 		view->count = 0;
5813 		break;
5814 	}
5815 
5816 	return err;
5817 }
5818 
5819 static const struct got_error *
5820 cmd_diff(int argc, char *argv[])
5821 {
5822 	const struct got_error *error;
5823 	struct got_repository *repo = NULL;
5824 	struct got_worktree *worktree = NULL;
5825 	struct got_object_id *id1 = NULL, *id2 = NULL;
5826 	char *repo_path = NULL, *cwd = NULL;
5827 	char *id_str1 = NULL, *id_str2 = NULL;
5828 	char *label1 = NULL, *label2 = NULL;
5829 	int diff_context = 3, ignore_whitespace = 0;
5830 	int ch, force_text_diff = 0;
5831 	const char *errstr;
5832 	struct tog_view *view;
5833 	int *pack_fds = NULL;
5834 
5835 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5836 		switch (ch) {
5837 		case 'a':
5838 			force_text_diff = 1;
5839 			break;
5840 		case 'C':
5841 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5842 			    &errstr);
5843 			if (errstr != NULL)
5844 				errx(1, "number of context lines is %s: %s",
5845 				    errstr, errstr);
5846 			break;
5847 		case 'r':
5848 			repo_path = realpath(optarg, NULL);
5849 			if (repo_path == NULL)
5850 				return got_error_from_errno2("realpath",
5851 				    optarg);
5852 			got_path_strip_trailing_slashes(repo_path);
5853 			break;
5854 		case 'w':
5855 			ignore_whitespace = 1;
5856 			break;
5857 		default:
5858 			usage_diff();
5859 			/* NOTREACHED */
5860 		}
5861 	}
5862 
5863 	argc -= optind;
5864 	argv += optind;
5865 
5866 	if (argc == 0) {
5867 		usage_diff(); /* TODO show local worktree changes */
5868 	} else if (argc == 2) {
5869 		id_str1 = argv[0];
5870 		id_str2 = argv[1];
5871 	} else
5872 		usage_diff();
5873 
5874 	error = got_repo_pack_fds_open(&pack_fds);
5875 	if (error)
5876 		goto done;
5877 
5878 	if (repo_path == NULL) {
5879 		cwd = getcwd(NULL, 0);
5880 		if (cwd == NULL)
5881 			return got_error_from_errno("getcwd");
5882 		error = got_worktree_open(&worktree, cwd);
5883 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5884 			goto done;
5885 		if (worktree)
5886 			repo_path =
5887 			    strdup(got_worktree_get_repo_path(worktree));
5888 		else
5889 			repo_path = strdup(cwd);
5890 		if (repo_path == NULL) {
5891 			error = got_error_from_errno("strdup");
5892 			goto done;
5893 		}
5894 	}
5895 
5896 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5897 	if (error)
5898 		goto done;
5899 
5900 	init_curses();
5901 
5902 	error = apply_unveil(got_repo_get_path(repo), NULL);
5903 	if (error)
5904 		goto done;
5905 
5906 	error = tog_load_refs(repo, 0);
5907 	if (error)
5908 		goto done;
5909 
5910 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5911 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5912 	if (error)
5913 		goto done;
5914 
5915 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5916 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5917 	if (error)
5918 		goto done;
5919 
5920 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5921 	if (view == NULL) {
5922 		error = got_error_from_errno("view_open");
5923 		goto done;
5924 	}
5925 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5926 	    ignore_whitespace, force_text_diff, NULL,  repo);
5927 	if (error)
5928 		goto done;
5929 	error = view_loop(view);
5930 done:
5931 	free(label1);
5932 	free(label2);
5933 	free(repo_path);
5934 	free(cwd);
5935 	if (repo) {
5936 		const struct got_error *close_err = got_repo_close(repo);
5937 		if (error == NULL)
5938 			error = close_err;
5939 	}
5940 	if (worktree)
5941 		got_worktree_close(worktree);
5942 	if (pack_fds) {
5943 		const struct got_error *pack_err =
5944 		    got_repo_pack_fds_close(pack_fds);
5945 		if (error == NULL)
5946 			error = pack_err;
5947 	}
5948 	tog_free_refs();
5949 	return error;
5950 }
5951 
5952 __dead static void
5953 usage_blame(void)
5954 {
5955 	endwin();
5956 	fprintf(stderr,
5957 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5958 	    getprogname());
5959 	exit(1);
5960 }
5961 
5962 struct tog_blame_line {
5963 	int annotated;
5964 	struct got_object_id *id;
5965 };
5966 
5967 static const struct got_error *
5968 draw_blame(struct tog_view *view)
5969 {
5970 	struct tog_blame_view_state *s = &view->state.blame;
5971 	struct tog_blame *blame = &s->blame;
5972 	regmatch_t *regmatch = &view->regmatch;
5973 	const struct got_error *err;
5974 	int lineno = 0, nprinted = 0;
5975 	char *line = NULL;
5976 	size_t linesize = 0;
5977 	ssize_t linelen;
5978 	wchar_t *wline;
5979 	int width;
5980 	struct tog_blame_line *blame_line;
5981 	struct got_object_id *prev_id = NULL;
5982 	char *id_str;
5983 	struct tog_color *tc;
5984 
5985 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5986 	if (err)
5987 		return err;
5988 
5989 	rewind(blame->f);
5990 	werase(view->window);
5991 
5992 	if (asprintf(&line, "commit %s", id_str) == -1) {
5993 		err = got_error_from_errno("asprintf");
5994 		free(id_str);
5995 		return err;
5996 	}
5997 
5998 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5999 	free(line);
6000 	line = NULL;
6001 	if (err)
6002 		return err;
6003 	if (view_needs_focus_indication(view))
6004 		wstandout(view->window);
6005 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6006 	if (tc)
6007 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6008 	waddwstr(view->window, wline);
6009 	while (width++ < view->ncols)
6010 		waddch(view->window, ' ');
6011 	if (tc)
6012 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6013 	if (view_needs_focus_indication(view))
6014 		wstandend(view->window);
6015 	free(wline);
6016 	wline = NULL;
6017 
6018 	if (view->gline > blame->nlines)
6019 		view->gline = blame->nlines;
6020 
6021 	if (tog_io.wait_for_ui) {
6022 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6023 		int rc;
6024 
6025 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6026 		if (rc)
6027 			return got_error_set_errno(rc, "pthread_cond_wait");
6028 		tog_io.wait_for_ui = 0;
6029 	}
6030 
6031 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6032 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6033 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6034 		free(id_str);
6035 		return got_error_from_errno("asprintf");
6036 	}
6037 	free(id_str);
6038 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6039 	free(line);
6040 	line = NULL;
6041 	if (err)
6042 		return err;
6043 	waddwstr(view->window, wline);
6044 	free(wline);
6045 	wline = NULL;
6046 	if (width < view->ncols - 1)
6047 		waddch(view->window, '\n');
6048 
6049 	s->eof = 0;
6050 	view->maxx = 0;
6051 	while (nprinted < view->nlines - 2) {
6052 		linelen = getline(&line, &linesize, blame->f);
6053 		if (linelen == -1) {
6054 			if (feof(blame->f)) {
6055 				s->eof = 1;
6056 				break;
6057 			}
6058 			free(line);
6059 			return got_ferror(blame->f, GOT_ERR_IO);
6060 		}
6061 		if (++lineno < s->first_displayed_line)
6062 			continue;
6063 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6064 			continue;
6065 
6066 		/* Set view->maxx based on full line length. */
6067 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6068 		if (err) {
6069 			free(line);
6070 			return err;
6071 		}
6072 		free(wline);
6073 		wline = NULL;
6074 		view->maxx = MAX(view->maxx, width);
6075 
6076 		if (nprinted == s->selected_line - 1)
6077 			wstandout(view->window);
6078 
6079 		if (blame->nlines > 0) {
6080 			blame_line = &blame->lines[lineno - 1];
6081 			if (blame_line->annotated && prev_id &&
6082 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6083 			    !(nprinted == s->selected_line - 1)) {
6084 				waddstr(view->window, "        ");
6085 			} else if (blame_line->annotated) {
6086 				char *id_str;
6087 				err = got_object_id_str(&id_str,
6088 				    blame_line->id);
6089 				if (err) {
6090 					free(line);
6091 					return err;
6092 				}
6093 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6094 				if (tc)
6095 					wattr_on(view->window,
6096 					    COLOR_PAIR(tc->colorpair), NULL);
6097 				wprintw(view->window, "%.8s", id_str);
6098 				if (tc)
6099 					wattr_off(view->window,
6100 					    COLOR_PAIR(tc->colorpair), NULL);
6101 				free(id_str);
6102 				prev_id = blame_line->id;
6103 			} else {
6104 				waddstr(view->window, "........");
6105 				prev_id = NULL;
6106 			}
6107 		} else {
6108 			waddstr(view->window, "........");
6109 			prev_id = NULL;
6110 		}
6111 
6112 		if (nprinted == s->selected_line - 1)
6113 			wstandend(view->window);
6114 		waddstr(view->window, " ");
6115 
6116 		if (view->ncols <= 9) {
6117 			width = 9;
6118 		} else if (s->first_displayed_line + nprinted ==
6119 		    s->matched_line &&
6120 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6121 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6122 			    view->window, view->x, regmatch);
6123 			if (err) {
6124 				free(line);
6125 				return err;
6126 			}
6127 			width += 9;
6128 		} else {
6129 			int skip;
6130 			err = format_line(&wline, &width, &skip, line,
6131 			    view->x, view->ncols - 9, 9, 1);
6132 			if (err) {
6133 				free(line);
6134 				return err;
6135 			}
6136 			waddwstr(view->window, &wline[skip]);
6137 			width += 9;
6138 			free(wline);
6139 			wline = NULL;
6140 		}
6141 
6142 		if (width <= view->ncols - 1)
6143 			waddch(view->window, '\n');
6144 		if (++nprinted == 1)
6145 			s->first_displayed_line = lineno;
6146 	}
6147 	free(line);
6148 	s->last_displayed_line = lineno;
6149 
6150 	view_border(view);
6151 
6152 	return NULL;
6153 }
6154 
6155 static const struct got_error *
6156 blame_cb(void *arg, int nlines, int lineno,
6157     struct got_commit_object *commit, struct got_object_id *id)
6158 {
6159 	const struct got_error *err = NULL;
6160 	struct tog_blame_cb_args *a = arg;
6161 	struct tog_blame_line *line;
6162 	int errcode;
6163 
6164 	if (nlines != a->nlines ||
6165 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6166 		return got_error(GOT_ERR_RANGE);
6167 
6168 	errcode = pthread_mutex_lock(&tog_mutex);
6169 	if (errcode)
6170 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6171 
6172 	if (*a->quit) {	/* user has quit the blame view */
6173 		err = got_error(GOT_ERR_ITER_COMPLETED);
6174 		goto done;
6175 	}
6176 
6177 	if (lineno == -1)
6178 		goto done; /* no change in this commit */
6179 
6180 	line = &a->lines[lineno - 1];
6181 	if (line->annotated)
6182 		goto done;
6183 
6184 	line->id = got_object_id_dup(id);
6185 	if (line->id == NULL) {
6186 		err = got_error_from_errno("got_object_id_dup");
6187 		goto done;
6188 	}
6189 	line->annotated = 1;
6190 done:
6191 	errcode = pthread_mutex_unlock(&tog_mutex);
6192 	if (errcode)
6193 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6194 	return err;
6195 }
6196 
6197 static void *
6198 blame_thread(void *arg)
6199 {
6200 	const struct got_error *err, *close_err;
6201 	struct tog_blame_thread_args *ta = arg;
6202 	struct tog_blame_cb_args *a = ta->cb_args;
6203 	int errcode, fd1 = -1, fd2 = -1;
6204 	FILE *f1 = NULL, *f2 = NULL;
6205 
6206 	fd1 = got_opentempfd();
6207 	if (fd1 == -1)
6208 		return (void *)got_error_from_errno("got_opentempfd");
6209 
6210 	fd2 = got_opentempfd();
6211 	if (fd2 == -1) {
6212 		err = got_error_from_errno("got_opentempfd");
6213 		goto done;
6214 	}
6215 
6216 	f1 = got_opentemp();
6217 	if (f1 == NULL) {
6218 		err = (void *)got_error_from_errno("got_opentemp");
6219 		goto done;
6220 	}
6221 	f2 = got_opentemp();
6222 	if (f2 == NULL) {
6223 		err = (void *)got_error_from_errno("got_opentemp");
6224 		goto done;
6225 	}
6226 
6227 	err = block_signals_used_by_main_thread();
6228 	if (err)
6229 		goto done;
6230 
6231 	err = got_blame(ta->path, a->commit_id, ta->repo,
6232 	    tog_diff_algo, blame_cb, ta->cb_args,
6233 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6234 	if (err && err->code == GOT_ERR_CANCELLED)
6235 		err = NULL;
6236 
6237 	errcode = pthread_mutex_lock(&tog_mutex);
6238 	if (errcode) {
6239 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6240 		goto done;
6241 	}
6242 
6243 	close_err = got_repo_close(ta->repo);
6244 	if (err == NULL)
6245 		err = close_err;
6246 	ta->repo = NULL;
6247 	*ta->complete = 1;
6248 
6249 	if (tog_io.wait_for_ui) {
6250 		errcode = pthread_cond_signal(&ta->blame_complete);
6251 		if (errcode && err == NULL)
6252 			err = got_error_set_errno(errcode,
6253 			    "pthread_cond_signal");
6254 	}
6255 
6256 	errcode = pthread_mutex_unlock(&tog_mutex);
6257 	if (errcode && err == NULL)
6258 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6259 
6260 done:
6261 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6262 		err = got_error_from_errno("close");
6263 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6264 		err = got_error_from_errno("close");
6265 	if (f1 && fclose(f1) == EOF && err == NULL)
6266 		err = got_error_from_errno("fclose");
6267 	if (f2 && fclose(f2) == EOF && err == NULL)
6268 		err = got_error_from_errno("fclose");
6269 
6270 	return (void *)err;
6271 }
6272 
6273 static struct got_object_id *
6274 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6275     int first_displayed_line, int selected_line)
6276 {
6277 	struct tog_blame_line *line;
6278 
6279 	if (nlines <= 0)
6280 		return NULL;
6281 
6282 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6283 	if (!line->annotated)
6284 		return NULL;
6285 
6286 	return line->id;
6287 }
6288 
6289 static struct got_object_id *
6290 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6291     int lineno)
6292 {
6293 	struct tog_blame_line *line;
6294 
6295 	if (nlines <= 0 || lineno >= nlines)
6296 		return NULL;
6297 
6298 	line = &lines[lineno - 1];
6299 	if (!line->annotated)
6300 		return NULL;
6301 
6302 	return line->id;
6303 }
6304 
6305 static const struct got_error *
6306 stop_blame(struct tog_blame *blame)
6307 {
6308 	const struct got_error *err = NULL;
6309 	int i;
6310 
6311 	if (blame->thread) {
6312 		int errcode;
6313 		errcode = pthread_mutex_unlock(&tog_mutex);
6314 		if (errcode)
6315 			return got_error_set_errno(errcode,
6316 			    "pthread_mutex_unlock");
6317 		errcode = pthread_join(blame->thread, (void **)&err);
6318 		if (errcode)
6319 			return got_error_set_errno(errcode, "pthread_join");
6320 		errcode = pthread_mutex_lock(&tog_mutex);
6321 		if (errcode)
6322 			return got_error_set_errno(errcode,
6323 			    "pthread_mutex_lock");
6324 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6325 			err = NULL;
6326 		blame->thread = NULL;
6327 	}
6328 	if (blame->thread_args.repo) {
6329 		const struct got_error *close_err;
6330 		close_err = got_repo_close(blame->thread_args.repo);
6331 		if (err == NULL)
6332 			err = close_err;
6333 		blame->thread_args.repo = NULL;
6334 	}
6335 	if (blame->f) {
6336 		if (fclose(blame->f) == EOF && err == NULL)
6337 			err = got_error_from_errno("fclose");
6338 		blame->f = NULL;
6339 	}
6340 	if (blame->lines) {
6341 		for (i = 0; i < blame->nlines; i++)
6342 			free(blame->lines[i].id);
6343 		free(blame->lines);
6344 		blame->lines = NULL;
6345 	}
6346 	free(blame->cb_args.commit_id);
6347 	blame->cb_args.commit_id = NULL;
6348 	if (blame->pack_fds) {
6349 		const struct got_error *pack_err =
6350 		    got_repo_pack_fds_close(blame->pack_fds);
6351 		if (err == NULL)
6352 			err = pack_err;
6353 		blame->pack_fds = NULL;
6354 	}
6355 	return err;
6356 }
6357 
6358 static const struct got_error *
6359 cancel_blame_view(void *arg)
6360 {
6361 	const struct got_error *err = NULL;
6362 	int *done = arg;
6363 	int errcode;
6364 
6365 	errcode = pthread_mutex_lock(&tog_mutex);
6366 	if (errcode)
6367 		return got_error_set_errno(errcode,
6368 		    "pthread_mutex_unlock");
6369 
6370 	if (*done)
6371 		err = got_error(GOT_ERR_CANCELLED);
6372 
6373 	errcode = pthread_mutex_unlock(&tog_mutex);
6374 	if (errcode)
6375 		return got_error_set_errno(errcode,
6376 		    "pthread_mutex_lock");
6377 
6378 	return err;
6379 }
6380 
6381 static const struct got_error *
6382 run_blame(struct tog_view *view)
6383 {
6384 	struct tog_blame_view_state *s = &view->state.blame;
6385 	struct tog_blame *blame = &s->blame;
6386 	const struct got_error *err = NULL;
6387 	struct got_commit_object *commit = NULL;
6388 	struct got_blob_object *blob = NULL;
6389 	struct got_repository *thread_repo = NULL;
6390 	struct got_object_id *obj_id = NULL;
6391 	int obj_type, fd = -1;
6392 	int *pack_fds = NULL;
6393 
6394 	err = got_object_open_as_commit(&commit, s->repo,
6395 	    &s->blamed_commit->id);
6396 	if (err)
6397 		return err;
6398 
6399 	fd = got_opentempfd();
6400 	if (fd == -1) {
6401 		err = got_error_from_errno("got_opentempfd");
6402 		goto done;
6403 	}
6404 
6405 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6406 	if (err)
6407 		goto done;
6408 
6409 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6410 	if (err)
6411 		goto done;
6412 
6413 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6414 		err = got_error(GOT_ERR_OBJ_TYPE);
6415 		goto done;
6416 	}
6417 
6418 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6419 	if (err)
6420 		goto done;
6421 	blame->f = got_opentemp();
6422 	if (blame->f == NULL) {
6423 		err = got_error_from_errno("got_opentemp");
6424 		goto done;
6425 	}
6426 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6427 	    &blame->line_offsets, blame->f, blob);
6428 	if (err)
6429 		goto done;
6430 	if (blame->nlines == 0) {
6431 		s->blame_complete = 1;
6432 		goto done;
6433 	}
6434 
6435 	/* Don't include \n at EOF in the blame line count. */
6436 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6437 		blame->nlines--;
6438 
6439 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6440 	if (blame->lines == NULL) {
6441 		err = got_error_from_errno("calloc");
6442 		goto done;
6443 	}
6444 
6445 	err = got_repo_pack_fds_open(&pack_fds);
6446 	if (err)
6447 		goto done;
6448 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6449 	    pack_fds);
6450 	if (err)
6451 		goto done;
6452 
6453 	blame->pack_fds = pack_fds;
6454 	blame->cb_args.view = view;
6455 	blame->cb_args.lines = blame->lines;
6456 	blame->cb_args.nlines = blame->nlines;
6457 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6458 	if (blame->cb_args.commit_id == NULL) {
6459 		err = got_error_from_errno("got_object_id_dup");
6460 		goto done;
6461 	}
6462 	blame->cb_args.quit = &s->done;
6463 
6464 	blame->thread_args.path = s->path;
6465 	blame->thread_args.repo = thread_repo;
6466 	blame->thread_args.cb_args = &blame->cb_args;
6467 	blame->thread_args.complete = &s->blame_complete;
6468 	blame->thread_args.cancel_cb = cancel_blame_view;
6469 	blame->thread_args.cancel_arg = &s->done;
6470 	s->blame_complete = 0;
6471 
6472 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6473 		s->first_displayed_line = 1;
6474 		s->last_displayed_line = view->nlines;
6475 		s->selected_line = 1;
6476 	}
6477 	s->matched_line = 0;
6478 
6479 done:
6480 	if (commit)
6481 		got_object_commit_close(commit);
6482 	if (fd != -1 && close(fd) == -1 && err == NULL)
6483 		err = got_error_from_errno("close");
6484 	if (blob)
6485 		got_object_blob_close(blob);
6486 	free(obj_id);
6487 	if (err)
6488 		stop_blame(blame);
6489 	return err;
6490 }
6491 
6492 static const struct got_error *
6493 open_blame_view(struct tog_view *view, char *path,
6494     struct got_object_id *commit_id, struct got_repository *repo)
6495 {
6496 	const struct got_error *err = NULL;
6497 	struct tog_blame_view_state *s = &view->state.blame;
6498 
6499 	STAILQ_INIT(&s->blamed_commits);
6500 
6501 	s->path = strdup(path);
6502 	if (s->path == NULL)
6503 		return got_error_from_errno("strdup");
6504 
6505 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6506 	if (err) {
6507 		free(s->path);
6508 		return err;
6509 	}
6510 
6511 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6512 	s->first_displayed_line = 1;
6513 	s->last_displayed_line = view->nlines;
6514 	s->selected_line = 1;
6515 	s->blame_complete = 0;
6516 	s->repo = repo;
6517 	s->commit_id = commit_id;
6518 	memset(&s->blame, 0, sizeof(s->blame));
6519 
6520 	STAILQ_INIT(&s->colors);
6521 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6522 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6523 		    get_color_value("TOG_COLOR_COMMIT"));
6524 		if (err)
6525 			return err;
6526 	}
6527 
6528 	view->show = show_blame_view;
6529 	view->input = input_blame_view;
6530 	view->reset = reset_blame_view;
6531 	view->close = close_blame_view;
6532 	view->search_start = search_start_blame_view;
6533 	view->search_setup = search_setup_blame_view;
6534 	view->search_next = search_next_view_match;
6535 
6536 	if (using_mock_io) {
6537 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6538 		int rc;
6539 
6540 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6541 		if (rc)
6542 			return got_error_set_errno(rc, "pthread_cond_init");
6543 	}
6544 
6545 	return run_blame(view);
6546 }
6547 
6548 static const struct got_error *
6549 close_blame_view(struct tog_view *view)
6550 {
6551 	const struct got_error *err = NULL;
6552 	struct tog_blame_view_state *s = &view->state.blame;
6553 
6554 	if (s->blame.thread)
6555 		err = stop_blame(&s->blame);
6556 
6557 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6558 		struct got_object_qid *blamed_commit;
6559 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6560 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6561 		got_object_qid_free(blamed_commit);
6562 	}
6563 
6564 	if (using_mock_io) {
6565 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6566 		int rc;
6567 
6568 		rc = pthread_cond_destroy(&bta->blame_complete);
6569 		if (rc && err == NULL)
6570 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6571 	}
6572 
6573 	free(s->path);
6574 	free_colors(&s->colors);
6575 	return err;
6576 }
6577 
6578 static const struct got_error *
6579 search_start_blame_view(struct tog_view *view)
6580 {
6581 	struct tog_blame_view_state *s = &view->state.blame;
6582 
6583 	s->matched_line = 0;
6584 	return NULL;
6585 }
6586 
6587 static void
6588 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6589     size_t *nlines, int **first, int **last, int **match, int **selected)
6590 {
6591 	struct tog_blame_view_state *s = &view->state.blame;
6592 
6593 	*f = s->blame.f;
6594 	*nlines = s->blame.nlines;
6595 	*line_offsets = s->blame.line_offsets;
6596 	*match = &s->matched_line;
6597 	*first = &s->first_displayed_line;
6598 	*last = &s->last_displayed_line;
6599 	*selected = &s->selected_line;
6600 }
6601 
6602 static const struct got_error *
6603 show_blame_view(struct tog_view *view)
6604 {
6605 	const struct got_error *err = NULL;
6606 	struct tog_blame_view_state *s = &view->state.blame;
6607 	int errcode;
6608 
6609 	if (s->blame.thread == NULL && !s->blame_complete) {
6610 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6611 		    &s->blame.thread_args);
6612 		if (errcode)
6613 			return got_error_set_errno(errcode, "pthread_create");
6614 
6615 		if (!using_mock_io)
6616 			halfdelay(1); /* fast refresh while annotating  */
6617 	}
6618 
6619 	if (s->blame_complete && !using_mock_io)
6620 		halfdelay(10); /* disable fast refresh */
6621 
6622 	err = draw_blame(view);
6623 
6624 	view_border(view);
6625 	return err;
6626 }
6627 
6628 static const struct got_error *
6629 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6630     struct got_repository *repo, struct got_object_id *id)
6631 {
6632 	struct tog_view		*log_view;
6633 	const struct got_error	*err = NULL;
6634 
6635 	*new_view = NULL;
6636 
6637 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6638 	if (log_view == NULL)
6639 		return got_error_from_errno("view_open");
6640 
6641 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6642 	if (err)
6643 		view_close(log_view);
6644 	else
6645 		*new_view = log_view;
6646 
6647 	return err;
6648 }
6649 
6650 static const struct got_error *
6651 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6652 {
6653 	const struct got_error *err = NULL, *thread_err = NULL;
6654 	struct tog_view *diff_view;
6655 	struct tog_blame_view_state *s = &view->state.blame;
6656 	int eos, nscroll, begin_y = 0, begin_x = 0;
6657 
6658 	eos = nscroll = view->nlines - 2;
6659 	if (view_is_hsplit_top(view))
6660 		--eos;  /* border */
6661 
6662 	switch (ch) {
6663 	case '0':
6664 	case '$':
6665 	case KEY_RIGHT:
6666 	case 'l':
6667 	case KEY_LEFT:
6668 	case 'h':
6669 		horizontal_scroll_input(view, ch);
6670 		break;
6671 	case 'q':
6672 		s->done = 1;
6673 		break;
6674 	case 'g':
6675 	case KEY_HOME:
6676 		s->selected_line = 1;
6677 		s->first_displayed_line = 1;
6678 		view->count = 0;
6679 		break;
6680 	case 'G':
6681 	case KEY_END:
6682 		if (s->blame.nlines < eos) {
6683 			s->selected_line = s->blame.nlines;
6684 			s->first_displayed_line = 1;
6685 		} else {
6686 			s->selected_line = eos;
6687 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6688 		}
6689 		view->count = 0;
6690 		break;
6691 	case 'k':
6692 	case KEY_UP:
6693 	case CTRL('p'):
6694 		if (s->selected_line > 1)
6695 			s->selected_line--;
6696 		else if (s->selected_line == 1 &&
6697 		    s->first_displayed_line > 1)
6698 			s->first_displayed_line--;
6699 		else
6700 			view->count = 0;
6701 		break;
6702 	case CTRL('u'):
6703 	case 'u':
6704 		nscroll /= 2;
6705 		/* FALL THROUGH */
6706 	case KEY_PPAGE:
6707 	case CTRL('b'):
6708 	case 'b':
6709 		if (s->first_displayed_line == 1) {
6710 			if (view->count > 1)
6711 				nscroll += nscroll;
6712 			s->selected_line = MAX(1, s->selected_line - nscroll);
6713 			view->count = 0;
6714 			break;
6715 		}
6716 		if (s->first_displayed_line > nscroll)
6717 			s->first_displayed_line -= nscroll;
6718 		else
6719 			s->first_displayed_line = 1;
6720 		break;
6721 	case 'j':
6722 	case KEY_DOWN:
6723 	case CTRL('n'):
6724 		if (s->selected_line < eos && s->first_displayed_line +
6725 		    s->selected_line <= s->blame.nlines)
6726 			s->selected_line++;
6727 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6728 			s->first_displayed_line++;
6729 		else
6730 			view->count = 0;
6731 		break;
6732 	case 'c':
6733 	case 'p': {
6734 		struct got_object_id *id = NULL;
6735 
6736 		view->count = 0;
6737 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6738 		    s->first_displayed_line, s->selected_line);
6739 		if (id == NULL)
6740 			break;
6741 		if (ch == 'p') {
6742 			struct got_commit_object *commit, *pcommit;
6743 			struct got_object_qid *pid;
6744 			struct got_object_id *blob_id = NULL;
6745 			int obj_type;
6746 			err = got_object_open_as_commit(&commit,
6747 			    s->repo, id);
6748 			if (err)
6749 				break;
6750 			pid = STAILQ_FIRST(
6751 			    got_object_commit_get_parent_ids(commit));
6752 			if (pid == NULL) {
6753 				got_object_commit_close(commit);
6754 				break;
6755 			}
6756 			/* Check if path history ends here. */
6757 			err = got_object_open_as_commit(&pcommit,
6758 			    s->repo, &pid->id);
6759 			if (err)
6760 				break;
6761 			err = got_object_id_by_path(&blob_id, s->repo,
6762 			    pcommit, s->path);
6763 			got_object_commit_close(pcommit);
6764 			if (err) {
6765 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6766 					err = NULL;
6767 				got_object_commit_close(commit);
6768 				break;
6769 			}
6770 			err = got_object_get_type(&obj_type, s->repo,
6771 			    blob_id);
6772 			free(blob_id);
6773 			/* Can't blame non-blob type objects. */
6774 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6775 				got_object_commit_close(commit);
6776 				break;
6777 			}
6778 			err = got_object_qid_alloc(&s->blamed_commit,
6779 			    &pid->id);
6780 			got_object_commit_close(commit);
6781 		} else {
6782 			if (got_object_id_cmp(id,
6783 			    &s->blamed_commit->id) == 0)
6784 				break;
6785 			err = got_object_qid_alloc(&s->blamed_commit,
6786 			    id);
6787 		}
6788 		if (err)
6789 			break;
6790 		s->done = 1;
6791 		thread_err = stop_blame(&s->blame);
6792 		s->done = 0;
6793 		if (thread_err)
6794 			break;
6795 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6796 		    s->blamed_commit, entry);
6797 		err = run_blame(view);
6798 		if (err)
6799 			break;
6800 		break;
6801 	}
6802 	case 'C': {
6803 		struct got_object_qid *first;
6804 
6805 		view->count = 0;
6806 		first = STAILQ_FIRST(&s->blamed_commits);
6807 		if (!got_object_id_cmp(&first->id, s->commit_id))
6808 			break;
6809 		s->done = 1;
6810 		thread_err = stop_blame(&s->blame);
6811 		s->done = 0;
6812 		if (thread_err)
6813 			break;
6814 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6815 		got_object_qid_free(s->blamed_commit);
6816 		s->blamed_commit =
6817 		    STAILQ_FIRST(&s->blamed_commits);
6818 		err = run_blame(view);
6819 		if (err)
6820 			break;
6821 		break;
6822 	}
6823 	case 'L':
6824 		view->count = 0;
6825 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6826 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6827 		if (s->id_to_log)
6828 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6829 		break;
6830 	case KEY_ENTER:
6831 	case '\r': {
6832 		struct got_object_id *id = NULL;
6833 		struct got_object_qid *pid;
6834 		struct got_commit_object *commit = NULL;
6835 
6836 		view->count = 0;
6837 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6838 		    s->first_displayed_line, s->selected_line);
6839 		if (id == NULL)
6840 			break;
6841 		err = got_object_open_as_commit(&commit, s->repo, id);
6842 		if (err)
6843 			break;
6844 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6845 		if (*new_view) {
6846 			/* traversed from diff view, release diff resources  */
6847 			err = close_diff_view(*new_view);
6848 			if (err)
6849 				break;
6850 			diff_view = *new_view;
6851 		} else {
6852 			if (view_is_parent_view(view))
6853 				view_get_split(view, &begin_y, &begin_x);
6854 
6855 			diff_view = view_open(0, 0, begin_y, begin_x,
6856 			    TOG_VIEW_DIFF);
6857 			if (diff_view == NULL) {
6858 				got_object_commit_close(commit);
6859 				err = got_error_from_errno("view_open");
6860 				break;
6861 			}
6862 		}
6863 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6864 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6865 		got_object_commit_close(commit);
6866 		if (err) {
6867 			view_close(diff_view);
6868 			break;
6869 		}
6870 		s->last_diffed_line = s->first_displayed_line - 1 +
6871 		    s->selected_line;
6872 		if (*new_view)
6873 			break;	/* still open from active diff view */
6874 		if (view_is_parent_view(view) &&
6875 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6876 			err = view_init_hsplit(view, begin_y);
6877 			if (err)
6878 				break;
6879 		}
6880 
6881 		view->focussed = 0;
6882 		diff_view->focussed = 1;
6883 		diff_view->mode = view->mode;
6884 		diff_view->nlines = view->lines - begin_y;
6885 		if (view_is_parent_view(view)) {
6886 			view_transfer_size(diff_view, view);
6887 			err = view_close_child(view);
6888 			if (err)
6889 				break;
6890 			err = view_set_child(view, diff_view);
6891 			if (err)
6892 				break;
6893 			view->focus_child = 1;
6894 		} else
6895 			*new_view = diff_view;
6896 		if (err)
6897 			break;
6898 		break;
6899 	}
6900 	case CTRL('d'):
6901 	case 'd':
6902 		nscroll /= 2;
6903 		/* FALL THROUGH */
6904 	case KEY_NPAGE:
6905 	case CTRL('f'):
6906 	case 'f':
6907 	case ' ':
6908 		if (s->last_displayed_line >= s->blame.nlines &&
6909 		    s->selected_line >= MIN(s->blame.nlines,
6910 		    view->nlines - 2)) {
6911 			view->count = 0;
6912 			break;
6913 		}
6914 		if (s->last_displayed_line >= s->blame.nlines &&
6915 		    s->selected_line < view->nlines - 2) {
6916 			s->selected_line +=
6917 			    MIN(nscroll, s->last_displayed_line -
6918 			    s->first_displayed_line - s->selected_line + 1);
6919 		}
6920 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6921 			s->first_displayed_line += nscroll;
6922 		else
6923 			s->first_displayed_line =
6924 			    s->blame.nlines - (view->nlines - 3);
6925 		break;
6926 	case KEY_RESIZE:
6927 		if (s->selected_line > view->nlines - 2) {
6928 			s->selected_line = MIN(s->blame.nlines,
6929 			    view->nlines - 2);
6930 		}
6931 		break;
6932 	default:
6933 		view->count = 0;
6934 		break;
6935 	}
6936 	return thread_err ? thread_err : err;
6937 }
6938 
6939 static const struct got_error *
6940 reset_blame_view(struct tog_view *view)
6941 {
6942 	const struct got_error *err;
6943 	struct tog_blame_view_state *s = &view->state.blame;
6944 
6945 	view->count = 0;
6946 	s->done = 1;
6947 	err = stop_blame(&s->blame);
6948 	s->done = 0;
6949 	if (err)
6950 		return err;
6951 	return run_blame(view);
6952 }
6953 
6954 static const struct got_error *
6955 cmd_blame(int argc, char *argv[])
6956 {
6957 	const struct got_error *error;
6958 	struct got_repository *repo = NULL;
6959 	struct got_worktree *worktree = NULL;
6960 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6961 	char *link_target = NULL;
6962 	struct got_object_id *commit_id = NULL;
6963 	struct got_commit_object *commit = NULL;
6964 	char *commit_id_str = NULL;
6965 	int ch;
6966 	struct tog_view *view = NULL;
6967 	int *pack_fds = NULL;
6968 
6969 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6970 		switch (ch) {
6971 		case 'c':
6972 			commit_id_str = optarg;
6973 			break;
6974 		case 'r':
6975 			repo_path = realpath(optarg, NULL);
6976 			if (repo_path == NULL)
6977 				return got_error_from_errno2("realpath",
6978 				    optarg);
6979 			break;
6980 		default:
6981 			usage_blame();
6982 			/* NOTREACHED */
6983 		}
6984 	}
6985 
6986 	argc -= optind;
6987 	argv += optind;
6988 
6989 	if (argc != 1)
6990 		usage_blame();
6991 
6992 	error = got_repo_pack_fds_open(&pack_fds);
6993 	if (error != NULL)
6994 		goto done;
6995 
6996 	if (repo_path == NULL) {
6997 		cwd = getcwd(NULL, 0);
6998 		if (cwd == NULL)
6999 			return got_error_from_errno("getcwd");
7000 		error = got_worktree_open(&worktree, cwd);
7001 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7002 			goto done;
7003 		if (worktree)
7004 			repo_path =
7005 			    strdup(got_worktree_get_repo_path(worktree));
7006 		else
7007 			repo_path = strdup(cwd);
7008 		if (repo_path == NULL) {
7009 			error = got_error_from_errno("strdup");
7010 			goto done;
7011 		}
7012 	}
7013 
7014 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7015 	if (error != NULL)
7016 		goto done;
7017 
7018 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7019 	    worktree);
7020 	if (error)
7021 		goto done;
7022 
7023 	init_curses();
7024 
7025 	error = apply_unveil(got_repo_get_path(repo), NULL);
7026 	if (error)
7027 		goto done;
7028 
7029 	error = tog_load_refs(repo, 0);
7030 	if (error)
7031 		goto done;
7032 
7033 	if (commit_id_str == NULL) {
7034 		struct got_reference *head_ref;
7035 		error = got_ref_open(&head_ref, repo, worktree ?
7036 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7037 		if (error != NULL)
7038 			goto done;
7039 		error = got_ref_resolve(&commit_id, repo, head_ref);
7040 		got_ref_close(head_ref);
7041 	} else {
7042 		error = got_repo_match_object_id(&commit_id, NULL,
7043 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7044 	}
7045 	if (error != NULL)
7046 		goto done;
7047 
7048 	error = got_object_open_as_commit(&commit, repo, commit_id);
7049 	if (error)
7050 		goto done;
7051 
7052 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7053 	    commit, repo);
7054 	if (error)
7055 		goto done;
7056 
7057 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7058 	if (view == NULL) {
7059 		error = got_error_from_errno("view_open");
7060 		goto done;
7061 	}
7062 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7063 	    commit_id, repo);
7064 	if (error != NULL) {
7065 		if (view->close == NULL)
7066 			close_blame_view(view);
7067 		view_close(view);
7068 		goto done;
7069 	}
7070 	if (worktree) {
7071 		/* Release work tree lock. */
7072 		got_worktree_close(worktree);
7073 		worktree = NULL;
7074 	}
7075 	error = view_loop(view);
7076 done:
7077 	free(repo_path);
7078 	free(in_repo_path);
7079 	free(link_target);
7080 	free(cwd);
7081 	free(commit_id);
7082 	if (commit)
7083 		got_object_commit_close(commit);
7084 	if (worktree)
7085 		got_worktree_close(worktree);
7086 	if (repo) {
7087 		const struct got_error *close_err = got_repo_close(repo);
7088 		if (error == NULL)
7089 			error = close_err;
7090 	}
7091 	if (pack_fds) {
7092 		const struct got_error *pack_err =
7093 		    got_repo_pack_fds_close(pack_fds);
7094 		if (error == NULL)
7095 			error = pack_err;
7096 	}
7097 	tog_free_refs();
7098 	return error;
7099 }
7100 
7101 static const struct got_error *
7102 draw_tree_entries(struct tog_view *view, const char *parent_path)
7103 {
7104 	struct tog_tree_view_state *s = &view->state.tree;
7105 	const struct got_error *err = NULL;
7106 	struct got_tree_entry *te;
7107 	wchar_t *wline;
7108 	char *index = NULL;
7109 	struct tog_color *tc;
7110 	int width, n, nentries, scrollx, i = 1;
7111 	int limit = view->nlines;
7112 
7113 	s->ndisplayed = 0;
7114 	if (view_is_hsplit_top(view))
7115 		--limit;  /* border */
7116 
7117 	werase(view->window);
7118 
7119 	if (limit == 0)
7120 		return NULL;
7121 
7122 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7123 	    0, 0);
7124 	if (err)
7125 		return err;
7126 	if (view_needs_focus_indication(view))
7127 		wstandout(view->window);
7128 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7129 	if (tc)
7130 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7131 	waddwstr(view->window, wline);
7132 	free(wline);
7133 	wline = NULL;
7134 	while (width++ < view->ncols)
7135 		waddch(view->window, ' ');
7136 	if (tc)
7137 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7138 	if (view_needs_focus_indication(view))
7139 		wstandend(view->window);
7140 	if (--limit <= 0)
7141 		return NULL;
7142 
7143 	i += s->selected;
7144 	if (s->first_displayed_entry) {
7145 		i += got_tree_entry_get_index(s->first_displayed_entry);
7146 		if (s->tree != s->root)
7147 			++i;  /* account for ".." entry */
7148 	}
7149 	nentries = got_object_tree_get_nentries(s->tree);
7150 	if (asprintf(&index, "[%d/%d] %s",
7151 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7152 		return got_error_from_errno("asprintf");
7153 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7154 	free(index);
7155 	if (err)
7156 		return err;
7157 	waddwstr(view->window, wline);
7158 	free(wline);
7159 	wline = NULL;
7160 	if (width < view->ncols - 1)
7161 		waddch(view->window, '\n');
7162 	if (--limit <= 0)
7163 		return NULL;
7164 	waddch(view->window, '\n');
7165 	if (--limit <= 0)
7166 		return NULL;
7167 
7168 	if (s->first_displayed_entry == NULL) {
7169 		te = got_object_tree_get_first_entry(s->tree);
7170 		if (s->selected == 0) {
7171 			if (view->focussed)
7172 				wstandout(view->window);
7173 			s->selected_entry = NULL;
7174 		}
7175 		waddstr(view->window, "  ..\n");	/* parent directory */
7176 		if (s->selected == 0 && view->focussed)
7177 			wstandend(view->window);
7178 		s->ndisplayed++;
7179 		if (--limit <= 0)
7180 			return NULL;
7181 		n = 1;
7182 	} else {
7183 		n = 0;
7184 		te = s->first_displayed_entry;
7185 	}
7186 
7187 	view->maxx = 0;
7188 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7189 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7190 		const char *modestr = "";
7191 		mode_t mode;
7192 
7193 		te = got_object_tree_get_entry(s->tree, i);
7194 		mode = got_tree_entry_get_mode(te);
7195 
7196 		if (s->show_ids) {
7197 			err = got_object_id_str(&id_str,
7198 			    got_tree_entry_get_id(te));
7199 			if (err)
7200 				return got_error_from_errno(
7201 				    "got_object_id_str");
7202 		}
7203 		if (got_object_tree_entry_is_submodule(te))
7204 			modestr = "$";
7205 		else if (S_ISLNK(mode)) {
7206 			int i;
7207 
7208 			err = got_tree_entry_get_symlink_target(&link_target,
7209 			    te, s->repo);
7210 			if (err) {
7211 				free(id_str);
7212 				return err;
7213 			}
7214 			for (i = 0; i < strlen(link_target); i++) {
7215 				if (!isprint((unsigned char)link_target[i]))
7216 					link_target[i] = '?';
7217 			}
7218 			modestr = "@";
7219 		}
7220 		else if (S_ISDIR(mode))
7221 			modestr = "/";
7222 		else if (mode & S_IXUSR)
7223 			modestr = "*";
7224 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7225 		    got_tree_entry_get_name(te), modestr,
7226 		    link_target ? " -> ": "",
7227 		    link_target ? link_target : "") == -1) {
7228 			free(id_str);
7229 			free(link_target);
7230 			return got_error_from_errno("asprintf");
7231 		}
7232 		free(id_str);
7233 		free(link_target);
7234 
7235 		/* use full line width to determine view->maxx */
7236 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7237 		if (err) {
7238 			free(line);
7239 			break;
7240 		}
7241 		view->maxx = MAX(view->maxx, width);
7242 		free(wline);
7243 		wline = NULL;
7244 
7245 		err = format_line(&wline, &width, &scrollx, line, view->x,
7246 		    view->ncols, 0, 0);
7247 		if (err) {
7248 			free(line);
7249 			break;
7250 		}
7251 		if (n == s->selected) {
7252 			if (view->focussed)
7253 				wstandout(view->window);
7254 			s->selected_entry = te;
7255 		}
7256 		tc = match_color(&s->colors, line);
7257 		if (tc)
7258 			wattr_on(view->window,
7259 			    COLOR_PAIR(tc->colorpair), NULL);
7260 		waddwstr(view->window, &wline[scrollx]);
7261 		if (tc)
7262 			wattr_off(view->window,
7263 			    COLOR_PAIR(tc->colorpair), NULL);
7264 		if (width < view->ncols)
7265 			waddch(view->window, '\n');
7266 		if (n == s->selected && view->focussed)
7267 			wstandend(view->window);
7268 		free(line);
7269 		free(wline);
7270 		wline = NULL;
7271 		n++;
7272 		s->ndisplayed++;
7273 		s->last_displayed_entry = te;
7274 		if (--limit <= 0)
7275 			break;
7276 	}
7277 
7278 	return err;
7279 }
7280 
7281 static void
7282 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7283 {
7284 	struct got_tree_entry *te;
7285 	int isroot = s->tree == s->root;
7286 	int i = 0;
7287 
7288 	if (s->first_displayed_entry == NULL)
7289 		return;
7290 
7291 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7292 	while (i++ < maxscroll) {
7293 		if (te == NULL) {
7294 			if (!isroot)
7295 				s->first_displayed_entry = NULL;
7296 			break;
7297 		}
7298 		s->first_displayed_entry = te;
7299 		te = got_tree_entry_get_prev(s->tree, te);
7300 	}
7301 }
7302 
7303 static const struct got_error *
7304 tree_scroll_down(struct tog_view *view, int maxscroll)
7305 {
7306 	struct tog_tree_view_state *s = &view->state.tree;
7307 	struct got_tree_entry *next, *last;
7308 	int n = 0;
7309 
7310 	if (s->first_displayed_entry)
7311 		next = got_tree_entry_get_next(s->tree,
7312 		    s->first_displayed_entry);
7313 	else
7314 		next = got_object_tree_get_first_entry(s->tree);
7315 
7316 	last = s->last_displayed_entry;
7317 	while (next && n++ < maxscroll) {
7318 		if (last) {
7319 			s->last_displayed_entry = last;
7320 			last = got_tree_entry_get_next(s->tree, last);
7321 		}
7322 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7323 			s->first_displayed_entry = next;
7324 			next = got_tree_entry_get_next(s->tree, next);
7325 		}
7326 	}
7327 
7328 	return NULL;
7329 }
7330 
7331 static const struct got_error *
7332 tree_entry_path(char **path, struct tog_parent_trees *parents,
7333     struct got_tree_entry *te)
7334 {
7335 	const struct got_error *err = NULL;
7336 	struct tog_parent_tree *pt;
7337 	size_t len = 2; /* for leading slash and NUL */
7338 
7339 	TAILQ_FOREACH(pt, parents, entry)
7340 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7341 		    + 1 /* slash */;
7342 	if (te)
7343 		len += strlen(got_tree_entry_get_name(te));
7344 
7345 	*path = calloc(1, len);
7346 	if (path == NULL)
7347 		return got_error_from_errno("calloc");
7348 
7349 	(*path)[0] = '/';
7350 	pt = TAILQ_LAST(parents, tog_parent_trees);
7351 	while (pt) {
7352 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7353 		if (strlcat(*path, name, len) >= len) {
7354 			err = got_error(GOT_ERR_NO_SPACE);
7355 			goto done;
7356 		}
7357 		if (strlcat(*path, "/", len) >= len) {
7358 			err = got_error(GOT_ERR_NO_SPACE);
7359 			goto done;
7360 		}
7361 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7362 	}
7363 	if (te) {
7364 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7365 			err = got_error(GOT_ERR_NO_SPACE);
7366 			goto done;
7367 		}
7368 	}
7369 done:
7370 	if (err) {
7371 		free(*path);
7372 		*path = NULL;
7373 	}
7374 	return err;
7375 }
7376 
7377 static const struct got_error *
7378 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7379     struct got_tree_entry *te, struct tog_parent_trees *parents,
7380     struct got_object_id *commit_id, struct got_repository *repo)
7381 {
7382 	const struct got_error *err = NULL;
7383 	char *path;
7384 	struct tog_view *blame_view;
7385 
7386 	*new_view = NULL;
7387 
7388 	err = tree_entry_path(&path, parents, te);
7389 	if (err)
7390 		return err;
7391 
7392 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7393 	if (blame_view == NULL) {
7394 		err = got_error_from_errno("view_open");
7395 		goto done;
7396 	}
7397 
7398 	err = open_blame_view(blame_view, path, commit_id, repo);
7399 	if (err) {
7400 		if (err->code == GOT_ERR_CANCELLED)
7401 			err = NULL;
7402 		view_close(blame_view);
7403 	} else
7404 		*new_view = blame_view;
7405 done:
7406 	free(path);
7407 	return err;
7408 }
7409 
7410 static const struct got_error *
7411 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7412     struct tog_tree_view_state *s)
7413 {
7414 	struct tog_view *log_view;
7415 	const struct got_error *err = NULL;
7416 	char *path;
7417 
7418 	*new_view = NULL;
7419 
7420 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7421 	if (log_view == NULL)
7422 		return got_error_from_errno("view_open");
7423 
7424 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7425 	if (err)
7426 		return err;
7427 
7428 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7429 	    path, 0);
7430 	if (err)
7431 		view_close(log_view);
7432 	else
7433 		*new_view = log_view;
7434 	free(path);
7435 	return err;
7436 }
7437 
7438 static const struct got_error *
7439 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7440     const char *head_ref_name, struct got_repository *repo)
7441 {
7442 	const struct got_error *err = NULL;
7443 	char *commit_id_str = NULL;
7444 	struct tog_tree_view_state *s = &view->state.tree;
7445 	struct got_commit_object *commit = NULL;
7446 
7447 	TAILQ_INIT(&s->parents);
7448 	STAILQ_INIT(&s->colors);
7449 
7450 	s->commit_id = got_object_id_dup(commit_id);
7451 	if (s->commit_id == NULL) {
7452 		err = got_error_from_errno("got_object_id_dup");
7453 		goto done;
7454 	}
7455 
7456 	err = got_object_open_as_commit(&commit, repo, commit_id);
7457 	if (err)
7458 		goto done;
7459 
7460 	/*
7461 	 * The root is opened here and will be closed when the view is closed.
7462 	 * Any visited subtrees and their path-wise parents are opened and
7463 	 * closed on demand.
7464 	 */
7465 	err = got_object_open_as_tree(&s->root, repo,
7466 	    got_object_commit_get_tree_id(commit));
7467 	if (err)
7468 		goto done;
7469 	s->tree = s->root;
7470 
7471 	err = got_object_id_str(&commit_id_str, commit_id);
7472 	if (err != NULL)
7473 		goto done;
7474 
7475 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7476 		err = got_error_from_errno("asprintf");
7477 		goto done;
7478 	}
7479 
7480 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7481 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7482 	if (head_ref_name) {
7483 		s->head_ref_name = strdup(head_ref_name);
7484 		if (s->head_ref_name == NULL) {
7485 			err = got_error_from_errno("strdup");
7486 			goto done;
7487 		}
7488 	}
7489 	s->repo = repo;
7490 
7491 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7492 		err = add_color(&s->colors, "\\$$",
7493 		    TOG_COLOR_TREE_SUBMODULE,
7494 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7495 		if (err)
7496 			goto done;
7497 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7498 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7499 		if (err)
7500 			goto done;
7501 		err = add_color(&s->colors, "/$",
7502 		    TOG_COLOR_TREE_DIRECTORY,
7503 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7504 		if (err)
7505 			goto done;
7506 
7507 		err = add_color(&s->colors, "\\*$",
7508 		    TOG_COLOR_TREE_EXECUTABLE,
7509 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7510 		if (err)
7511 			goto done;
7512 
7513 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7514 		    get_color_value("TOG_COLOR_COMMIT"));
7515 		if (err)
7516 			goto done;
7517 	}
7518 
7519 	view->show = show_tree_view;
7520 	view->input = input_tree_view;
7521 	view->close = close_tree_view;
7522 	view->search_start = search_start_tree_view;
7523 	view->search_next = search_next_tree_view;
7524 done:
7525 	free(commit_id_str);
7526 	if (commit)
7527 		got_object_commit_close(commit);
7528 	if (err) {
7529 		if (view->close == NULL)
7530 			close_tree_view(view);
7531 		view_close(view);
7532 	}
7533 	return err;
7534 }
7535 
7536 static const struct got_error *
7537 close_tree_view(struct tog_view *view)
7538 {
7539 	struct tog_tree_view_state *s = &view->state.tree;
7540 
7541 	free_colors(&s->colors);
7542 	free(s->tree_label);
7543 	s->tree_label = NULL;
7544 	free(s->commit_id);
7545 	s->commit_id = NULL;
7546 	free(s->head_ref_name);
7547 	s->head_ref_name = NULL;
7548 	while (!TAILQ_EMPTY(&s->parents)) {
7549 		struct tog_parent_tree *parent;
7550 		parent = TAILQ_FIRST(&s->parents);
7551 		TAILQ_REMOVE(&s->parents, parent, entry);
7552 		if (parent->tree != s->root)
7553 			got_object_tree_close(parent->tree);
7554 		free(parent);
7555 
7556 	}
7557 	if (s->tree != NULL && s->tree != s->root)
7558 		got_object_tree_close(s->tree);
7559 	if (s->root)
7560 		got_object_tree_close(s->root);
7561 	return NULL;
7562 }
7563 
7564 static const struct got_error *
7565 search_start_tree_view(struct tog_view *view)
7566 {
7567 	struct tog_tree_view_state *s = &view->state.tree;
7568 
7569 	s->matched_entry = NULL;
7570 	return NULL;
7571 }
7572 
7573 static int
7574 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7575 {
7576 	regmatch_t regmatch;
7577 
7578 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7579 	    0) == 0;
7580 }
7581 
7582 static const struct got_error *
7583 search_next_tree_view(struct tog_view *view)
7584 {
7585 	struct tog_tree_view_state *s = &view->state.tree;
7586 	struct got_tree_entry *te = NULL;
7587 
7588 	if (!view->searching) {
7589 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7590 		return NULL;
7591 	}
7592 
7593 	if (s->matched_entry) {
7594 		if (view->searching == TOG_SEARCH_FORWARD) {
7595 			if (s->selected_entry)
7596 				te = got_tree_entry_get_next(s->tree,
7597 				    s->selected_entry);
7598 			else
7599 				te = got_object_tree_get_first_entry(s->tree);
7600 		} else {
7601 			if (s->selected_entry == NULL)
7602 				te = got_object_tree_get_last_entry(s->tree);
7603 			else
7604 				te = got_tree_entry_get_prev(s->tree,
7605 				    s->selected_entry);
7606 		}
7607 	} else {
7608 		if (s->selected_entry)
7609 			te = s->selected_entry;
7610 		else if (view->searching == TOG_SEARCH_FORWARD)
7611 			te = got_object_tree_get_first_entry(s->tree);
7612 		else
7613 			te = got_object_tree_get_last_entry(s->tree);
7614 	}
7615 
7616 	while (1) {
7617 		if (te == NULL) {
7618 			if (s->matched_entry == NULL) {
7619 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7620 				return NULL;
7621 			}
7622 			if (view->searching == TOG_SEARCH_FORWARD)
7623 				te = got_object_tree_get_first_entry(s->tree);
7624 			else
7625 				te = got_object_tree_get_last_entry(s->tree);
7626 		}
7627 
7628 		if (match_tree_entry(te, &view->regex)) {
7629 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7630 			s->matched_entry = te;
7631 			break;
7632 		}
7633 
7634 		if (view->searching == TOG_SEARCH_FORWARD)
7635 			te = got_tree_entry_get_next(s->tree, te);
7636 		else
7637 			te = got_tree_entry_get_prev(s->tree, te);
7638 	}
7639 
7640 	if (s->matched_entry) {
7641 		s->first_displayed_entry = s->matched_entry;
7642 		s->selected = 0;
7643 	}
7644 
7645 	return NULL;
7646 }
7647 
7648 static const struct got_error *
7649 show_tree_view(struct tog_view *view)
7650 {
7651 	const struct got_error *err = NULL;
7652 	struct tog_tree_view_state *s = &view->state.tree;
7653 	char *parent_path;
7654 
7655 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7656 	if (err)
7657 		return err;
7658 
7659 	err = draw_tree_entries(view, parent_path);
7660 	free(parent_path);
7661 
7662 	view_border(view);
7663 	return err;
7664 }
7665 
7666 static const struct got_error *
7667 tree_goto_line(struct tog_view *view, int nlines)
7668 {
7669 	const struct got_error		 *err = NULL;
7670 	struct tog_tree_view_state	 *s = &view->state.tree;
7671 	struct got_tree_entry		**fte, **lte, **ste;
7672 	int				  g, last, first = 1, i = 1;
7673 	int				  root = s->tree == s->root;
7674 	int				  off = root ? 1 : 2;
7675 
7676 	g = view->gline;
7677 	view->gline = 0;
7678 
7679 	if (g == 0)
7680 		g = 1;
7681 	else if (g > got_object_tree_get_nentries(s->tree))
7682 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7683 
7684 	fte = &s->first_displayed_entry;
7685 	lte = &s->last_displayed_entry;
7686 	ste = &s->selected_entry;
7687 
7688 	if (*fte != NULL) {
7689 		first = got_tree_entry_get_index(*fte);
7690 		first += off;  /* account for ".." */
7691 	}
7692 	last = got_tree_entry_get_index(*lte);
7693 	last += off;
7694 
7695 	if (g >= first && g <= last && g - first < nlines) {
7696 		s->selected = g - first;
7697 		return NULL;	/* gline is on the current page */
7698 	}
7699 
7700 	if (*ste != NULL) {
7701 		i = got_tree_entry_get_index(*ste);
7702 		i += off;
7703 	}
7704 
7705 	if (i < g) {
7706 		err = tree_scroll_down(view, g - i);
7707 		if (err)
7708 			return err;
7709 		if (got_tree_entry_get_index(*lte) >=
7710 		    got_object_tree_get_nentries(s->tree) - 1 &&
7711 		    first + s->selected < g &&
7712 		    s->selected < s->ndisplayed - 1) {
7713 			first = got_tree_entry_get_index(*fte);
7714 			first += off;
7715 			s->selected = g - first;
7716 		}
7717 	} else if (i > g)
7718 		tree_scroll_up(s, i - g);
7719 
7720 	if (g < nlines &&
7721 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7722 		s->selected = g - 1;
7723 
7724 	return NULL;
7725 }
7726 
7727 static const struct got_error *
7728 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7729 {
7730 	const struct got_error *err = NULL;
7731 	struct tog_tree_view_state *s = &view->state.tree;
7732 	struct got_tree_entry *te;
7733 	int n, nscroll = view->nlines - 3;
7734 
7735 	if (view->gline)
7736 		return tree_goto_line(view, nscroll);
7737 
7738 	switch (ch) {
7739 	case '0':
7740 	case '$':
7741 	case KEY_RIGHT:
7742 	case 'l':
7743 	case KEY_LEFT:
7744 	case 'h':
7745 		horizontal_scroll_input(view, ch);
7746 		break;
7747 	case 'i':
7748 		s->show_ids = !s->show_ids;
7749 		view->count = 0;
7750 		break;
7751 	case 'L':
7752 		view->count = 0;
7753 		if (!s->selected_entry)
7754 			break;
7755 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7756 		break;
7757 	case 'R':
7758 		view->count = 0;
7759 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7760 		break;
7761 	case 'g':
7762 	case '=':
7763 	case KEY_HOME:
7764 		s->selected = 0;
7765 		view->count = 0;
7766 		if (s->tree == s->root)
7767 			s->first_displayed_entry =
7768 			    got_object_tree_get_first_entry(s->tree);
7769 		else
7770 			s->first_displayed_entry = NULL;
7771 		break;
7772 	case 'G':
7773 	case '*':
7774 	case KEY_END: {
7775 		int eos = view->nlines - 3;
7776 
7777 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7778 			--eos;  /* border */
7779 		s->selected = 0;
7780 		view->count = 0;
7781 		te = got_object_tree_get_last_entry(s->tree);
7782 		for (n = 0; n < eos; n++) {
7783 			if (te == NULL) {
7784 				if (s->tree != s->root) {
7785 					s->first_displayed_entry = NULL;
7786 					n++;
7787 				}
7788 				break;
7789 			}
7790 			s->first_displayed_entry = te;
7791 			te = got_tree_entry_get_prev(s->tree, te);
7792 		}
7793 		if (n > 0)
7794 			s->selected = n - 1;
7795 		break;
7796 	}
7797 	case 'k':
7798 	case KEY_UP:
7799 	case CTRL('p'):
7800 		if (s->selected > 0) {
7801 			s->selected--;
7802 			break;
7803 		}
7804 		tree_scroll_up(s, 1);
7805 		if (s->selected_entry == NULL ||
7806 		    (s->tree == s->root && s->selected_entry ==
7807 		     got_object_tree_get_first_entry(s->tree)))
7808 			view->count = 0;
7809 		break;
7810 	case CTRL('u'):
7811 	case 'u':
7812 		nscroll /= 2;
7813 		/* FALL THROUGH */
7814 	case KEY_PPAGE:
7815 	case CTRL('b'):
7816 	case 'b':
7817 		if (s->tree == s->root) {
7818 			if (got_object_tree_get_first_entry(s->tree) ==
7819 			    s->first_displayed_entry)
7820 				s->selected -= MIN(s->selected, nscroll);
7821 		} else {
7822 			if (s->first_displayed_entry == NULL)
7823 				s->selected -= MIN(s->selected, nscroll);
7824 		}
7825 		tree_scroll_up(s, MAX(0, nscroll));
7826 		if (s->selected_entry == NULL ||
7827 		    (s->tree == s->root && s->selected_entry ==
7828 		     got_object_tree_get_first_entry(s->tree)))
7829 			view->count = 0;
7830 		break;
7831 	case 'j':
7832 	case KEY_DOWN:
7833 	case CTRL('n'):
7834 		if (s->selected < s->ndisplayed - 1) {
7835 			s->selected++;
7836 			break;
7837 		}
7838 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7839 		    == NULL) {
7840 			/* can't scroll any further */
7841 			view->count = 0;
7842 			break;
7843 		}
7844 		tree_scroll_down(view, 1);
7845 		break;
7846 	case CTRL('d'):
7847 	case 'd':
7848 		nscroll /= 2;
7849 		/* FALL THROUGH */
7850 	case KEY_NPAGE:
7851 	case CTRL('f'):
7852 	case 'f':
7853 	case ' ':
7854 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7855 		    == NULL) {
7856 			/* can't scroll any further; move cursor down */
7857 			if (s->selected < s->ndisplayed - 1)
7858 				s->selected += MIN(nscroll,
7859 				    s->ndisplayed - s->selected - 1);
7860 			else
7861 				view->count = 0;
7862 			break;
7863 		}
7864 		tree_scroll_down(view, nscroll);
7865 		break;
7866 	case KEY_ENTER:
7867 	case '\r':
7868 	case KEY_BACKSPACE:
7869 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7870 			struct tog_parent_tree *parent;
7871 			/* user selected '..' */
7872 			if (s->tree == s->root) {
7873 				view->count = 0;
7874 				break;
7875 			}
7876 			parent = TAILQ_FIRST(&s->parents);
7877 			TAILQ_REMOVE(&s->parents, parent,
7878 			    entry);
7879 			got_object_tree_close(s->tree);
7880 			s->tree = parent->tree;
7881 			s->first_displayed_entry =
7882 			    parent->first_displayed_entry;
7883 			s->selected_entry =
7884 			    parent->selected_entry;
7885 			s->selected = parent->selected;
7886 			if (s->selected > view->nlines - 3) {
7887 				err = offset_selection_down(view);
7888 				if (err)
7889 					break;
7890 			}
7891 			free(parent);
7892 		} else if (S_ISDIR(got_tree_entry_get_mode(
7893 		    s->selected_entry))) {
7894 			struct got_tree_object *subtree;
7895 			view->count = 0;
7896 			err = got_object_open_as_tree(&subtree, s->repo,
7897 			    got_tree_entry_get_id(s->selected_entry));
7898 			if (err)
7899 				break;
7900 			err = tree_view_visit_subtree(s, subtree);
7901 			if (err) {
7902 				got_object_tree_close(subtree);
7903 				break;
7904 			}
7905 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7906 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7907 		break;
7908 	case KEY_RESIZE:
7909 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7910 			s->selected = view->nlines - 4;
7911 		view->count = 0;
7912 		break;
7913 	default:
7914 		view->count = 0;
7915 		break;
7916 	}
7917 
7918 	return err;
7919 }
7920 
7921 __dead static void
7922 usage_tree(void)
7923 {
7924 	endwin();
7925 	fprintf(stderr,
7926 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7927 	    getprogname());
7928 	exit(1);
7929 }
7930 
7931 static const struct got_error *
7932 cmd_tree(int argc, char *argv[])
7933 {
7934 	const struct got_error *error;
7935 	struct got_repository *repo = NULL;
7936 	struct got_worktree *worktree = NULL;
7937 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7938 	struct got_object_id *commit_id = NULL;
7939 	struct got_commit_object *commit = NULL;
7940 	const char *commit_id_arg = NULL;
7941 	char *label = NULL;
7942 	struct got_reference *ref = NULL;
7943 	const char *head_ref_name = NULL;
7944 	int ch;
7945 	struct tog_view *view;
7946 	int *pack_fds = NULL;
7947 
7948 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7949 		switch (ch) {
7950 		case 'c':
7951 			commit_id_arg = optarg;
7952 			break;
7953 		case 'r':
7954 			repo_path = realpath(optarg, NULL);
7955 			if (repo_path == NULL)
7956 				return got_error_from_errno2("realpath",
7957 				    optarg);
7958 			break;
7959 		default:
7960 			usage_tree();
7961 			/* NOTREACHED */
7962 		}
7963 	}
7964 
7965 	argc -= optind;
7966 	argv += optind;
7967 
7968 	if (argc > 1)
7969 		usage_tree();
7970 
7971 	error = got_repo_pack_fds_open(&pack_fds);
7972 	if (error != NULL)
7973 		goto done;
7974 
7975 	if (repo_path == NULL) {
7976 		cwd = getcwd(NULL, 0);
7977 		if (cwd == NULL)
7978 			return got_error_from_errno("getcwd");
7979 		error = got_worktree_open(&worktree, cwd);
7980 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7981 			goto done;
7982 		if (worktree)
7983 			repo_path =
7984 			    strdup(got_worktree_get_repo_path(worktree));
7985 		else
7986 			repo_path = strdup(cwd);
7987 		if (repo_path == NULL) {
7988 			error = got_error_from_errno("strdup");
7989 			goto done;
7990 		}
7991 	}
7992 
7993 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7994 	if (error != NULL)
7995 		goto done;
7996 
7997 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7998 	    repo, worktree);
7999 	if (error)
8000 		goto done;
8001 
8002 	init_curses();
8003 
8004 	error = apply_unveil(got_repo_get_path(repo), NULL);
8005 	if (error)
8006 		goto done;
8007 
8008 	error = tog_load_refs(repo, 0);
8009 	if (error)
8010 		goto done;
8011 
8012 	if (commit_id_arg == NULL) {
8013 		error = got_repo_match_object_id(&commit_id, &label,
8014 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8015 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8016 		if (error)
8017 			goto done;
8018 		head_ref_name = label;
8019 	} else {
8020 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8021 		if (error == NULL)
8022 			head_ref_name = got_ref_get_name(ref);
8023 		else if (error->code != GOT_ERR_NOT_REF)
8024 			goto done;
8025 		error = got_repo_match_object_id(&commit_id, NULL,
8026 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8027 		if (error)
8028 			goto done;
8029 	}
8030 
8031 	error = got_object_open_as_commit(&commit, repo, commit_id);
8032 	if (error)
8033 		goto done;
8034 
8035 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8036 	if (view == NULL) {
8037 		error = got_error_from_errno("view_open");
8038 		goto done;
8039 	}
8040 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8041 	if (error)
8042 		goto done;
8043 	if (!got_path_is_root_dir(in_repo_path)) {
8044 		error = tree_view_walk_path(&view->state.tree, commit,
8045 		    in_repo_path);
8046 		if (error)
8047 			goto done;
8048 	}
8049 
8050 	if (worktree) {
8051 		/* Release work tree lock. */
8052 		got_worktree_close(worktree);
8053 		worktree = NULL;
8054 	}
8055 	error = view_loop(view);
8056 done:
8057 	free(repo_path);
8058 	free(cwd);
8059 	free(commit_id);
8060 	free(label);
8061 	if (ref)
8062 		got_ref_close(ref);
8063 	if (repo) {
8064 		const struct got_error *close_err = got_repo_close(repo);
8065 		if (error == NULL)
8066 			error = close_err;
8067 	}
8068 	if (pack_fds) {
8069 		const struct got_error *pack_err =
8070 		    got_repo_pack_fds_close(pack_fds);
8071 		if (error == NULL)
8072 			error = pack_err;
8073 	}
8074 	tog_free_refs();
8075 	return error;
8076 }
8077 
8078 static const struct got_error *
8079 ref_view_load_refs(struct tog_ref_view_state *s)
8080 {
8081 	struct got_reflist_entry *sre;
8082 	struct tog_reflist_entry *re;
8083 
8084 	s->nrefs = 0;
8085 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8086 		if (strncmp(got_ref_get_name(sre->ref),
8087 		    "refs/got/", 9) == 0 &&
8088 		    strncmp(got_ref_get_name(sre->ref),
8089 		    "refs/got/backup/", 16) != 0)
8090 			continue;
8091 
8092 		re = malloc(sizeof(*re));
8093 		if (re == NULL)
8094 			return got_error_from_errno("malloc");
8095 
8096 		re->ref = got_ref_dup(sre->ref);
8097 		if (re->ref == NULL)
8098 			return got_error_from_errno("got_ref_dup");
8099 		re->idx = s->nrefs++;
8100 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8101 	}
8102 
8103 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8104 	return NULL;
8105 }
8106 
8107 static void
8108 ref_view_free_refs(struct tog_ref_view_state *s)
8109 {
8110 	struct tog_reflist_entry *re;
8111 
8112 	while (!TAILQ_EMPTY(&s->refs)) {
8113 		re = TAILQ_FIRST(&s->refs);
8114 		TAILQ_REMOVE(&s->refs, re, entry);
8115 		got_ref_close(re->ref);
8116 		free(re);
8117 	}
8118 }
8119 
8120 static const struct got_error *
8121 open_ref_view(struct tog_view *view, struct got_repository *repo)
8122 {
8123 	const struct got_error *err = NULL;
8124 	struct tog_ref_view_state *s = &view->state.ref;
8125 
8126 	s->selected_entry = 0;
8127 	s->repo = repo;
8128 
8129 	TAILQ_INIT(&s->refs);
8130 	STAILQ_INIT(&s->colors);
8131 
8132 	err = ref_view_load_refs(s);
8133 	if (err)
8134 		goto done;
8135 
8136 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8137 		err = add_color(&s->colors, "^refs/heads/",
8138 		    TOG_COLOR_REFS_HEADS,
8139 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8140 		if (err)
8141 			goto done;
8142 
8143 		err = add_color(&s->colors, "^refs/tags/",
8144 		    TOG_COLOR_REFS_TAGS,
8145 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8146 		if (err)
8147 			goto done;
8148 
8149 		err = add_color(&s->colors, "^refs/remotes/",
8150 		    TOG_COLOR_REFS_REMOTES,
8151 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8152 		if (err)
8153 			goto done;
8154 
8155 		err = add_color(&s->colors, "^refs/got/backup/",
8156 		    TOG_COLOR_REFS_BACKUP,
8157 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8158 		if (err)
8159 			goto done;
8160 	}
8161 
8162 	view->show = show_ref_view;
8163 	view->input = input_ref_view;
8164 	view->close = close_ref_view;
8165 	view->search_start = search_start_ref_view;
8166 	view->search_next = search_next_ref_view;
8167 done:
8168 	if (err) {
8169 		if (view->close == NULL)
8170 			close_ref_view(view);
8171 		view_close(view);
8172 	}
8173 	return err;
8174 }
8175 
8176 static const struct got_error *
8177 close_ref_view(struct tog_view *view)
8178 {
8179 	struct tog_ref_view_state *s = &view->state.ref;
8180 
8181 	ref_view_free_refs(s);
8182 	free_colors(&s->colors);
8183 
8184 	return NULL;
8185 }
8186 
8187 static const struct got_error *
8188 resolve_reflist_entry(struct got_object_id **commit_id,
8189     struct tog_reflist_entry *re, struct got_repository *repo)
8190 {
8191 	const struct got_error *err = NULL;
8192 	struct got_object_id *obj_id;
8193 	struct got_tag_object *tag = NULL;
8194 	int obj_type;
8195 
8196 	*commit_id = NULL;
8197 
8198 	err = got_ref_resolve(&obj_id, repo, re->ref);
8199 	if (err)
8200 		return err;
8201 
8202 	err = got_object_get_type(&obj_type, repo, obj_id);
8203 	if (err)
8204 		goto done;
8205 
8206 	switch (obj_type) {
8207 	case GOT_OBJ_TYPE_COMMIT:
8208 		*commit_id = obj_id;
8209 		break;
8210 	case GOT_OBJ_TYPE_TAG:
8211 		err = got_object_open_as_tag(&tag, repo, obj_id);
8212 		if (err)
8213 			goto done;
8214 		free(obj_id);
8215 		err = got_object_get_type(&obj_type, repo,
8216 		    got_object_tag_get_object_id(tag));
8217 		if (err)
8218 			goto done;
8219 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8220 			err = got_error(GOT_ERR_OBJ_TYPE);
8221 			goto done;
8222 		}
8223 		*commit_id = got_object_id_dup(
8224 		    got_object_tag_get_object_id(tag));
8225 		if (*commit_id == NULL) {
8226 			err = got_error_from_errno("got_object_id_dup");
8227 			goto done;
8228 		}
8229 		break;
8230 	default:
8231 		err = got_error(GOT_ERR_OBJ_TYPE);
8232 		break;
8233 	}
8234 
8235 done:
8236 	if (tag)
8237 		got_object_tag_close(tag);
8238 	if (err) {
8239 		free(*commit_id);
8240 		*commit_id = NULL;
8241 	}
8242 	return err;
8243 }
8244 
8245 static const struct got_error *
8246 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8247     struct tog_reflist_entry *re, struct got_repository *repo)
8248 {
8249 	struct tog_view *log_view;
8250 	const struct got_error *err = NULL;
8251 	struct got_object_id *commit_id = NULL;
8252 
8253 	*new_view = NULL;
8254 
8255 	err = resolve_reflist_entry(&commit_id, re, repo);
8256 	if (err) {
8257 		if (err->code != GOT_ERR_OBJ_TYPE)
8258 			return err;
8259 		else
8260 			return NULL;
8261 	}
8262 
8263 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8264 	if (log_view == NULL) {
8265 		err = got_error_from_errno("view_open");
8266 		goto done;
8267 	}
8268 
8269 	err = open_log_view(log_view, commit_id, repo,
8270 	    got_ref_get_name(re->ref), "", 0);
8271 done:
8272 	if (err)
8273 		view_close(log_view);
8274 	else
8275 		*new_view = log_view;
8276 	free(commit_id);
8277 	return err;
8278 }
8279 
8280 static void
8281 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8282 {
8283 	struct tog_reflist_entry *re;
8284 	int i = 0;
8285 
8286 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8287 		return;
8288 
8289 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8290 	while (i++ < maxscroll) {
8291 		if (re == NULL)
8292 			break;
8293 		s->first_displayed_entry = re;
8294 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8295 	}
8296 }
8297 
8298 static const struct got_error *
8299 ref_scroll_down(struct tog_view *view, int maxscroll)
8300 {
8301 	struct tog_ref_view_state *s = &view->state.ref;
8302 	struct tog_reflist_entry *next, *last;
8303 	int n = 0;
8304 
8305 	if (s->first_displayed_entry)
8306 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8307 	else
8308 		next = TAILQ_FIRST(&s->refs);
8309 
8310 	last = s->last_displayed_entry;
8311 	while (next && n++ < maxscroll) {
8312 		if (last) {
8313 			s->last_displayed_entry = last;
8314 			last = TAILQ_NEXT(last, entry);
8315 		}
8316 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8317 			s->first_displayed_entry = next;
8318 			next = TAILQ_NEXT(next, entry);
8319 		}
8320 	}
8321 
8322 	return NULL;
8323 }
8324 
8325 static const struct got_error *
8326 search_start_ref_view(struct tog_view *view)
8327 {
8328 	struct tog_ref_view_state *s = &view->state.ref;
8329 
8330 	s->matched_entry = NULL;
8331 	return NULL;
8332 }
8333 
8334 static int
8335 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8336 {
8337 	regmatch_t regmatch;
8338 
8339 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8340 	    0) == 0;
8341 }
8342 
8343 static const struct got_error *
8344 search_next_ref_view(struct tog_view *view)
8345 {
8346 	struct tog_ref_view_state *s = &view->state.ref;
8347 	struct tog_reflist_entry *re = NULL;
8348 
8349 	if (!view->searching) {
8350 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8351 		return NULL;
8352 	}
8353 
8354 	if (s->matched_entry) {
8355 		if (view->searching == TOG_SEARCH_FORWARD) {
8356 			if (s->selected_entry)
8357 				re = TAILQ_NEXT(s->selected_entry, entry);
8358 			else
8359 				re = TAILQ_PREV(s->selected_entry,
8360 				    tog_reflist_head, entry);
8361 		} else {
8362 			if (s->selected_entry == NULL)
8363 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8364 			else
8365 				re = TAILQ_PREV(s->selected_entry,
8366 				    tog_reflist_head, entry);
8367 		}
8368 	} else {
8369 		if (s->selected_entry)
8370 			re = s->selected_entry;
8371 		else if (view->searching == TOG_SEARCH_FORWARD)
8372 			re = TAILQ_FIRST(&s->refs);
8373 		else
8374 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8375 	}
8376 
8377 	while (1) {
8378 		if (re == NULL) {
8379 			if (s->matched_entry == NULL) {
8380 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8381 				return NULL;
8382 			}
8383 			if (view->searching == TOG_SEARCH_FORWARD)
8384 				re = TAILQ_FIRST(&s->refs);
8385 			else
8386 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8387 		}
8388 
8389 		if (match_reflist_entry(re, &view->regex)) {
8390 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8391 			s->matched_entry = re;
8392 			break;
8393 		}
8394 
8395 		if (view->searching == TOG_SEARCH_FORWARD)
8396 			re = TAILQ_NEXT(re, entry);
8397 		else
8398 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8399 	}
8400 
8401 	if (s->matched_entry) {
8402 		s->first_displayed_entry = s->matched_entry;
8403 		s->selected = 0;
8404 	}
8405 
8406 	return NULL;
8407 }
8408 
8409 static const struct got_error *
8410 show_ref_view(struct tog_view *view)
8411 {
8412 	const struct got_error *err = NULL;
8413 	struct tog_ref_view_state *s = &view->state.ref;
8414 	struct tog_reflist_entry *re;
8415 	char *line = NULL;
8416 	wchar_t *wline;
8417 	struct tog_color *tc;
8418 	int width, n, scrollx;
8419 	int limit = view->nlines;
8420 
8421 	werase(view->window);
8422 
8423 	s->ndisplayed = 0;
8424 	if (view_is_hsplit_top(view))
8425 		--limit;  /* border */
8426 
8427 	if (limit == 0)
8428 		return NULL;
8429 
8430 	re = s->first_displayed_entry;
8431 
8432 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8433 	    s->nrefs) == -1)
8434 		return got_error_from_errno("asprintf");
8435 
8436 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8437 	if (err) {
8438 		free(line);
8439 		return err;
8440 	}
8441 	if (view_needs_focus_indication(view))
8442 		wstandout(view->window);
8443 	waddwstr(view->window, wline);
8444 	while (width++ < view->ncols)
8445 		waddch(view->window, ' ');
8446 	if (view_needs_focus_indication(view))
8447 		wstandend(view->window);
8448 	free(wline);
8449 	wline = NULL;
8450 	free(line);
8451 	line = NULL;
8452 	if (--limit <= 0)
8453 		return NULL;
8454 
8455 	n = 0;
8456 	view->maxx = 0;
8457 	while (re && limit > 0) {
8458 		char *line = NULL;
8459 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8460 
8461 		if (s->show_date) {
8462 			struct got_commit_object *ci;
8463 			struct got_tag_object *tag;
8464 			struct got_object_id *id;
8465 			struct tm tm;
8466 			time_t t;
8467 
8468 			err = got_ref_resolve(&id, s->repo, re->ref);
8469 			if (err)
8470 				return err;
8471 			err = got_object_open_as_tag(&tag, s->repo, id);
8472 			if (err) {
8473 				if (err->code != GOT_ERR_OBJ_TYPE) {
8474 					free(id);
8475 					return err;
8476 				}
8477 				err = got_object_open_as_commit(&ci, s->repo,
8478 				    id);
8479 				if (err) {
8480 					free(id);
8481 					return err;
8482 				}
8483 				t = got_object_commit_get_committer_time(ci);
8484 				got_object_commit_close(ci);
8485 			} else {
8486 				t = got_object_tag_get_tagger_time(tag);
8487 				got_object_tag_close(tag);
8488 			}
8489 			free(id);
8490 			if (gmtime_r(&t, &tm) == NULL)
8491 				return got_error_from_errno("gmtime_r");
8492 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8493 				return got_error(GOT_ERR_NO_SPACE);
8494 		}
8495 		if (got_ref_is_symbolic(re->ref)) {
8496 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8497 			    ymd : "", got_ref_get_name(re->ref),
8498 			    got_ref_get_symref_target(re->ref)) == -1)
8499 				return got_error_from_errno("asprintf");
8500 		} else if (s->show_ids) {
8501 			struct got_object_id *id;
8502 			char *id_str;
8503 			err = got_ref_resolve(&id, s->repo, re->ref);
8504 			if (err)
8505 				return err;
8506 			err = got_object_id_str(&id_str, id);
8507 			if (err) {
8508 				free(id);
8509 				return err;
8510 			}
8511 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8512 			    got_ref_get_name(re->ref), id_str) == -1) {
8513 				err = got_error_from_errno("asprintf");
8514 				free(id);
8515 				free(id_str);
8516 				return err;
8517 			}
8518 			free(id);
8519 			free(id_str);
8520 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8521 		    got_ref_get_name(re->ref)) == -1)
8522 			return got_error_from_errno("asprintf");
8523 
8524 		/* use full line width to determine view->maxx */
8525 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8526 		if (err) {
8527 			free(line);
8528 			return err;
8529 		}
8530 		view->maxx = MAX(view->maxx, width);
8531 		free(wline);
8532 		wline = NULL;
8533 
8534 		err = format_line(&wline, &width, &scrollx, line, view->x,
8535 		    view->ncols, 0, 0);
8536 		if (err) {
8537 			free(line);
8538 			return err;
8539 		}
8540 		if (n == s->selected) {
8541 			if (view->focussed)
8542 				wstandout(view->window);
8543 			s->selected_entry = re;
8544 		}
8545 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8546 		if (tc)
8547 			wattr_on(view->window,
8548 			    COLOR_PAIR(tc->colorpair), NULL);
8549 		waddwstr(view->window, &wline[scrollx]);
8550 		if (tc)
8551 			wattr_off(view->window,
8552 			    COLOR_PAIR(tc->colorpair), NULL);
8553 		if (width < view->ncols)
8554 			waddch(view->window, '\n');
8555 		if (n == s->selected && view->focussed)
8556 			wstandend(view->window);
8557 		free(line);
8558 		free(wline);
8559 		wline = NULL;
8560 		n++;
8561 		s->ndisplayed++;
8562 		s->last_displayed_entry = re;
8563 
8564 		limit--;
8565 		re = TAILQ_NEXT(re, entry);
8566 	}
8567 
8568 	view_border(view);
8569 	return err;
8570 }
8571 
8572 static const struct got_error *
8573 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8574     struct tog_reflist_entry *re, struct got_repository *repo)
8575 {
8576 	const struct got_error *err = NULL;
8577 	struct got_object_id *commit_id = NULL;
8578 	struct tog_view *tree_view;
8579 
8580 	*new_view = NULL;
8581 
8582 	err = resolve_reflist_entry(&commit_id, re, repo);
8583 	if (err) {
8584 		if (err->code != GOT_ERR_OBJ_TYPE)
8585 			return err;
8586 		else
8587 			return NULL;
8588 	}
8589 
8590 
8591 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8592 	if (tree_view == NULL) {
8593 		err = got_error_from_errno("view_open");
8594 		goto done;
8595 	}
8596 
8597 	err = open_tree_view(tree_view, commit_id,
8598 	    got_ref_get_name(re->ref), repo);
8599 	if (err)
8600 		goto done;
8601 
8602 	*new_view = tree_view;
8603 done:
8604 	free(commit_id);
8605 	return err;
8606 }
8607 
8608 static const struct got_error *
8609 ref_goto_line(struct tog_view *view, int nlines)
8610 {
8611 	const struct got_error		*err = NULL;
8612 	struct tog_ref_view_state	*s = &view->state.ref;
8613 	int				 g, idx = s->selected_entry->idx;
8614 
8615 	g = view->gline;
8616 	view->gline = 0;
8617 
8618 	if (g == 0)
8619 		g = 1;
8620 	else if (g > s->nrefs)
8621 		g = s->nrefs;
8622 
8623 	if (g >= s->first_displayed_entry->idx + 1 &&
8624 	    g <= s->last_displayed_entry->idx + 1 &&
8625 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8626 		s->selected = g - s->first_displayed_entry->idx - 1;
8627 		return NULL;
8628 	}
8629 
8630 	if (idx + 1 < g) {
8631 		err = ref_scroll_down(view, g - idx - 1);
8632 		if (err)
8633 			return err;
8634 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8635 		    s->first_displayed_entry->idx + s->selected < g &&
8636 		    s->selected < s->ndisplayed - 1)
8637 			s->selected = g - s->first_displayed_entry->idx - 1;
8638 	} else if (idx + 1 > g)
8639 		ref_scroll_up(s, idx - g + 1);
8640 
8641 	if (g < nlines && s->first_displayed_entry->idx == 0)
8642 		s->selected = g - 1;
8643 
8644 	return NULL;
8645 
8646 }
8647 
8648 static const struct got_error *
8649 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8650 {
8651 	const struct got_error *err = NULL;
8652 	struct tog_ref_view_state *s = &view->state.ref;
8653 	struct tog_reflist_entry *re;
8654 	int n, nscroll = view->nlines - 1;
8655 
8656 	if (view->gline)
8657 		return ref_goto_line(view, nscroll);
8658 
8659 	switch (ch) {
8660 	case '0':
8661 	case '$':
8662 	case KEY_RIGHT:
8663 	case 'l':
8664 	case KEY_LEFT:
8665 	case 'h':
8666 		horizontal_scroll_input(view, ch);
8667 		break;
8668 	case 'i':
8669 		s->show_ids = !s->show_ids;
8670 		view->count = 0;
8671 		break;
8672 	case 'm':
8673 		s->show_date = !s->show_date;
8674 		view->count = 0;
8675 		break;
8676 	case 'o':
8677 		s->sort_by_date = !s->sort_by_date;
8678 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8679 		view->count = 0;
8680 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8681 		    got_ref_cmp_by_commit_timestamp_descending :
8682 		    tog_ref_cmp_by_name, s->repo);
8683 		if (err)
8684 			break;
8685 		got_reflist_object_id_map_free(tog_refs_idmap);
8686 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8687 		    &tog_refs, s->repo);
8688 		if (err)
8689 			break;
8690 		ref_view_free_refs(s);
8691 		err = ref_view_load_refs(s);
8692 		break;
8693 	case KEY_ENTER:
8694 	case '\r':
8695 		view->count = 0;
8696 		if (!s->selected_entry)
8697 			break;
8698 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8699 		break;
8700 	case 'T':
8701 		view->count = 0;
8702 		if (!s->selected_entry)
8703 			break;
8704 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8705 		break;
8706 	case 'g':
8707 	case '=':
8708 	case KEY_HOME:
8709 		s->selected = 0;
8710 		view->count = 0;
8711 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8712 		break;
8713 	case 'G':
8714 	case '*':
8715 	case KEY_END: {
8716 		int eos = view->nlines - 1;
8717 
8718 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8719 			--eos;  /* border */
8720 		s->selected = 0;
8721 		view->count = 0;
8722 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8723 		for (n = 0; n < eos; n++) {
8724 			if (re == NULL)
8725 				break;
8726 			s->first_displayed_entry = re;
8727 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8728 		}
8729 		if (n > 0)
8730 			s->selected = n - 1;
8731 		break;
8732 	}
8733 	case 'k':
8734 	case KEY_UP:
8735 	case CTRL('p'):
8736 		if (s->selected > 0) {
8737 			s->selected--;
8738 			break;
8739 		}
8740 		ref_scroll_up(s, 1);
8741 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8742 			view->count = 0;
8743 		break;
8744 	case CTRL('u'):
8745 	case 'u':
8746 		nscroll /= 2;
8747 		/* FALL THROUGH */
8748 	case KEY_PPAGE:
8749 	case CTRL('b'):
8750 	case 'b':
8751 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8752 			s->selected -= MIN(nscroll, s->selected);
8753 		ref_scroll_up(s, MAX(0, nscroll));
8754 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8755 			view->count = 0;
8756 		break;
8757 	case 'j':
8758 	case KEY_DOWN:
8759 	case CTRL('n'):
8760 		if (s->selected < s->ndisplayed - 1) {
8761 			s->selected++;
8762 			break;
8763 		}
8764 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8765 			/* can't scroll any further */
8766 			view->count = 0;
8767 			break;
8768 		}
8769 		ref_scroll_down(view, 1);
8770 		break;
8771 	case CTRL('d'):
8772 	case 'd':
8773 		nscroll /= 2;
8774 		/* FALL THROUGH */
8775 	case KEY_NPAGE:
8776 	case CTRL('f'):
8777 	case 'f':
8778 	case ' ':
8779 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8780 			/* can't scroll any further; move cursor down */
8781 			if (s->selected < s->ndisplayed - 1)
8782 				s->selected += MIN(nscroll,
8783 				    s->ndisplayed - s->selected - 1);
8784 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8785 				s->selected += s->ndisplayed - s->selected - 1;
8786 			view->count = 0;
8787 			break;
8788 		}
8789 		ref_scroll_down(view, nscroll);
8790 		break;
8791 	case CTRL('l'):
8792 		view->count = 0;
8793 		tog_free_refs();
8794 		err = tog_load_refs(s->repo, s->sort_by_date);
8795 		if (err)
8796 			break;
8797 		ref_view_free_refs(s);
8798 		err = ref_view_load_refs(s);
8799 		break;
8800 	case KEY_RESIZE:
8801 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8802 			s->selected = view->nlines - 2;
8803 		break;
8804 	default:
8805 		view->count = 0;
8806 		break;
8807 	}
8808 
8809 	return err;
8810 }
8811 
8812 __dead static void
8813 usage_ref(void)
8814 {
8815 	endwin();
8816 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8817 	    getprogname());
8818 	exit(1);
8819 }
8820 
8821 static const struct got_error *
8822 cmd_ref(int argc, char *argv[])
8823 {
8824 	const struct got_error *error;
8825 	struct got_repository *repo = NULL;
8826 	struct got_worktree *worktree = NULL;
8827 	char *cwd = NULL, *repo_path = NULL;
8828 	int ch;
8829 	struct tog_view *view;
8830 	int *pack_fds = NULL;
8831 
8832 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8833 		switch (ch) {
8834 		case 'r':
8835 			repo_path = realpath(optarg, NULL);
8836 			if (repo_path == NULL)
8837 				return got_error_from_errno2("realpath",
8838 				    optarg);
8839 			break;
8840 		default:
8841 			usage_ref();
8842 			/* NOTREACHED */
8843 		}
8844 	}
8845 
8846 	argc -= optind;
8847 	argv += optind;
8848 
8849 	if (argc > 1)
8850 		usage_ref();
8851 
8852 	error = got_repo_pack_fds_open(&pack_fds);
8853 	if (error != NULL)
8854 		goto done;
8855 
8856 	if (repo_path == NULL) {
8857 		cwd = getcwd(NULL, 0);
8858 		if (cwd == NULL)
8859 			return got_error_from_errno("getcwd");
8860 		error = got_worktree_open(&worktree, cwd);
8861 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8862 			goto done;
8863 		if (worktree)
8864 			repo_path =
8865 			    strdup(got_worktree_get_repo_path(worktree));
8866 		else
8867 			repo_path = strdup(cwd);
8868 		if (repo_path == NULL) {
8869 			error = got_error_from_errno("strdup");
8870 			goto done;
8871 		}
8872 	}
8873 
8874 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8875 	if (error != NULL)
8876 		goto done;
8877 
8878 	init_curses();
8879 
8880 	error = apply_unveil(got_repo_get_path(repo), NULL);
8881 	if (error)
8882 		goto done;
8883 
8884 	error = tog_load_refs(repo, 0);
8885 	if (error)
8886 		goto done;
8887 
8888 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8889 	if (view == NULL) {
8890 		error = got_error_from_errno("view_open");
8891 		goto done;
8892 	}
8893 
8894 	error = open_ref_view(view, repo);
8895 	if (error)
8896 		goto done;
8897 
8898 	if (worktree) {
8899 		/* Release work tree lock. */
8900 		got_worktree_close(worktree);
8901 		worktree = NULL;
8902 	}
8903 	error = view_loop(view);
8904 done:
8905 	free(repo_path);
8906 	free(cwd);
8907 	if (repo) {
8908 		const struct got_error *close_err = got_repo_close(repo);
8909 		if (close_err)
8910 			error = close_err;
8911 	}
8912 	if (pack_fds) {
8913 		const struct got_error *pack_err =
8914 		    got_repo_pack_fds_close(pack_fds);
8915 		if (error == NULL)
8916 			error = pack_err;
8917 	}
8918 	tog_free_refs();
8919 	return error;
8920 }
8921 
8922 static const struct got_error*
8923 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8924     const char *str)
8925 {
8926 	size_t len;
8927 
8928 	if (win == NULL)
8929 		win = stdscr;
8930 
8931 	len = strlen(str);
8932 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8933 
8934 	if (focus)
8935 		wstandout(win);
8936 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8937 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8938 	if (focus)
8939 		wstandend(win);
8940 
8941 	return NULL;
8942 }
8943 
8944 static const struct got_error *
8945 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8946 {
8947 	off_t *p;
8948 
8949 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8950 	if (p == NULL) {
8951 		free(*line_offsets);
8952 		*line_offsets = NULL;
8953 		return got_error_from_errno("reallocarray");
8954 	}
8955 
8956 	*line_offsets = p;
8957 	(*line_offsets)[*nlines] = off;
8958 	++(*nlines);
8959 	return NULL;
8960 }
8961 
8962 static const struct got_error *
8963 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8964 {
8965 	*ret = 0;
8966 
8967 	for (;n > 0; --n, ++km) {
8968 		char	*t0, *t, *k;
8969 		size_t	 len = 1;
8970 
8971 		if (km->keys == NULL)
8972 			continue;
8973 
8974 		t = t0 = strdup(km->keys);
8975 		if (t0 == NULL)
8976 			return got_error_from_errno("strdup");
8977 
8978 		len += strlen(t);
8979 		while ((k = strsep(&t, " ")) != NULL)
8980 			len += strlen(k) > 1 ? 2 : 0;
8981 		free(t0);
8982 		*ret = MAX(*ret, len);
8983 	}
8984 
8985 	return NULL;
8986 }
8987 
8988 /*
8989  * Write keymap section headers, keys, and key info in km to f.
8990  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8991  * wrap control and symbolic keys in guillemets, else use <>.
8992  */
8993 static const struct got_error *
8994 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8995 {
8996 	int n, len = width;
8997 
8998 	if (km->keys) {
8999 		static const char *u8_glyph[] = {
9000 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9001 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9002 		};
9003 		char	*t0, *t, *k;
9004 		int	 cs, s, first = 1;
9005 
9006 		cs = got_locale_is_utf8();
9007 
9008 		t = t0 = strdup(km->keys);
9009 		if (t0 == NULL)
9010 			return got_error_from_errno("strdup");
9011 
9012 		len = strlen(km->keys);
9013 		while ((k = strsep(&t, " ")) != NULL) {
9014 			s = strlen(k) > 1;  /* control or symbolic key */
9015 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9016 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9017 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9018 			if (n < 0) {
9019 				free(t0);
9020 				return got_error_from_errno("fprintf");
9021 			}
9022 			first = 0;
9023 			len += s ? 2 : 0;
9024 			*off += n;
9025 		}
9026 		free(t0);
9027 	}
9028 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9029 	if (n < 0)
9030 		return got_error_from_errno("fprintf");
9031 	*off += n;
9032 
9033 	return NULL;
9034 }
9035 
9036 static const struct got_error *
9037 format_help(struct tog_help_view_state *s)
9038 {
9039 	const struct got_error		*err = NULL;
9040 	off_t				 off = 0;
9041 	int				 i, max, n, show = s->all;
9042 	static const struct tog_key_map	 km[] = {
9043 #define KEYMAP_(info, type)	{ NULL, (info), type }
9044 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9045 		GENERATE_HELP
9046 #undef KEYMAP_
9047 #undef KEY_
9048 	};
9049 
9050 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9051 	if (err)
9052 		return err;
9053 
9054 	n = nitems(km);
9055 	err = max_key_str(&max, km, n);
9056 	if (err)
9057 		return err;
9058 
9059 	for (i = 0; i < n; ++i) {
9060 		if (km[i].keys == NULL) {
9061 			show = s->all;
9062 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9063 			    km[i].type == s->type || s->all)
9064 				show = 1;
9065 		}
9066 		if (show) {
9067 			err = format_help_line(&off, s->f, &km[i], max);
9068 			if (err)
9069 				return err;
9070 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9071 			if (err)
9072 				return err;
9073 		}
9074 	}
9075 	fputc('\n', s->f);
9076 	++off;
9077 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9078 	return err;
9079 }
9080 
9081 static const struct got_error *
9082 create_help(struct tog_help_view_state *s)
9083 {
9084 	FILE			*f;
9085 	const struct got_error	*err;
9086 
9087 	free(s->line_offsets);
9088 	s->line_offsets = NULL;
9089 	s->nlines = 0;
9090 
9091 	f = got_opentemp();
9092 	if (f == NULL)
9093 		return got_error_from_errno("got_opentemp");
9094 	s->f = f;
9095 
9096 	err = format_help(s);
9097 	if (err)
9098 		return err;
9099 
9100 	if (s->f && fflush(s->f) != 0)
9101 		return got_error_from_errno("fflush");
9102 
9103 	return NULL;
9104 }
9105 
9106 static const struct got_error *
9107 search_start_help_view(struct tog_view *view)
9108 {
9109 	view->state.help.matched_line = 0;
9110 	return NULL;
9111 }
9112 
9113 static void
9114 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9115     size_t *nlines, int **first, int **last, int **match, int **selected)
9116 {
9117 	struct tog_help_view_state *s = &view->state.help;
9118 
9119 	*f = s->f;
9120 	*nlines = s->nlines;
9121 	*line_offsets = s->line_offsets;
9122 	*match = &s->matched_line;
9123 	*first = &s->first_displayed_line;
9124 	*last = &s->last_displayed_line;
9125 	*selected = &s->selected_line;
9126 }
9127 
9128 static const struct got_error *
9129 show_help_view(struct tog_view *view)
9130 {
9131 	struct tog_help_view_state	*s = &view->state.help;
9132 	const struct got_error		*err;
9133 	regmatch_t			*regmatch = &view->regmatch;
9134 	wchar_t				*wline;
9135 	char				*line;
9136 	ssize_t				 linelen;
9137 	size_t				 linesz = 0;
9138 	int				 width, nprinted = 0, rc = 0;
9139 	int				 eos = view->nlines;
9140 
9141 	if (view_is_hsplit_top(view))
9142 		--eos;  /* account for border */
9143 
9144 	s->lineno = 0;
9145 	rewind(s->f);
9146 	werase(view->window);
9147 
9148 	if (view->gline > s->nlines - 1)
9149 		view->gline = s->nlines - 1;
9150 
9151 	err = win_draw_center(view->window, 0, 0, view->ncols,
9152 	    view_needs_focus_indication(view),
9153 	    "tog help (press q to return to tog)");
9154 	if (err)
9155 		return err;
9156 	if (eos <= 1)
9157 		return NULL;
9158 	waddstr(view->window, "\n\n");
9159 	eos -= 2;
9160 
9161 	s->eof = 0;
9162 	view->maxx = 0;
9163 	line = NULL;
9164 	while (eos > 0 && nprinted < eos) {
9165 		attr_t attr = 0;
9166 
9167 		linelen = getline(&line, &linesz, s->f);
9168 		if (linelen == -1) {
9169 			if (!feof(s->f)) {
9170 				free(line);
9171 				return got_ferror(s->f, GOT_ERR_IO);
9172 			}
9173 			s->eof = 1;
9174 			break;
9175 		}
9176 		if (++s->lineno < s->first_displayed_line)
9177 			continue;
9178 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9179 			continue;
9180 		if (s->lineno == view->hiline)
9181 			attr = A_STANDOUT;
9182 
9183 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9184 		    view->x ? 1 : 0);
9185 		if (err) {
9186 			free(line);
9187 			return err;
9188 		}
9189 		view->maxx = MAX(view->maxx, width);
9190 		free(wline);
9191 		wline = NULL;
9192 
9193 		if (attr)
9194 			wattron(view->window, attr);
9195 		if (s->first_displayed_line + nprinted == s->matched_line &&
9196 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9197 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9198 			    view->window, view->x, regmatch);
9199 			if (err) {
9200 				free(line);
9201 				return err;
9202 			}
9203 		} else {
9204 			int skip;
9205 
9206 			err = format_line(&wline, &width, &skip, line,
9207 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9208 			if (err) {
9209 				free(line);
9210 				return err;
9211 			}
9212 			waddwstr(view->window, &wline[skip]);
9213 			free(wline);
9214 			wline = NULL;
9215 		}
9216 		if (s->lineno == view->hiline) {
9217 			while (width++ < view->ncols)
9218 				waddch(view->window, ' ');
9219 		} else {
9220 			if (width < view->ncols)
9221 				waddch(view->window, '\n');
9222 		}
9223 		if (attr)
9224 			wattroff(view->window, attr);
9225 		if (++nprinted == 1)
9226 			s->first_displayed_line = s->lineno;
9227 	}
9228 	free(line);
9229 	if (nprinted > 0)
9230 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9231 	else
9232 		s->last_displayed_line = s->first_displayed_line;
9233 
9234 	view_border(view);
9235 
9236 	if (s->eof) {
9237 		rc = waddnstr(view->window,
9238 		    "See the tog(1) manual page for full documentation",
9239 		    view->ncols - 1);
9240 		if (rc == ERR)
9241 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9242 	} else {
9243 		wmove(view->window, view->nlines - 1, 0);
9244 		wclrtoeol(view->window);
9245 		wstandout(view->window);
9246 		rc = waddnstr(view->window, "scroll down for more...",
9247 		    view->ncols - 1);
9248 		if (rc == ERR)
9249 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9250 		if (getcurx(view->window) < view->ncols - 6) {
9251 			rc = wprintw(view->window, "[%.0f%%]",
9252 			    100.00 * s->last_displayed_line / s->nlines);
9253 			if (rc == ERR)
9254 				return got_error_msg(GOT_ERR_IO, "wprintw");
9255 		}
9256 		wstandend(view->window);
9257 	}
9258 
9259 	return NULL;
9260 }
9261 
9262 static const struct got_error *
9263 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9264 {
9265 	struct tog_help_view_state	*s = &view->state.help;
9266 	const struct got_error		*err = NULL;
9267 	char				*line = NULL;
9268 	ssize_t				 linelen;
9269 	size_t				 linesz = 0;
9270 	int				 eos, nscroll;
9271 
9272 	eos = nscroll = view->nlines;
9273 	if (view_is_hsplit_top(view))
9274 		--eos;  /* border */
9275 
9276 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9277 
9278 	switch (ch) {
9279 	case '0':
9280 	case '$':
9281 	case KEY_RIGHT:
9282 	case 'l':
9283 	case KEY_LEFT:
9284 	case 'h':
9285 		horizontal_scroll_input(view, ch);
9286 		break;
9287 	case 'g':
9288 	case KEY_HOME:
9289 		s->first_displayed_line = 1;
9290 		view->count = 0;
9291 		break;
9292 	case 'G':
9293 	case KEY_END:
9294 		view->count = 0;
9295 		if (s->eof)
9296 			break;
9297 		s->first_displayed_line = (s->nlines - eos) + 3;
9298 		s->eof = 1;
9299 		break;
9300 	case 'k':
9301 	case KEY_UP:
9302 		if (s->first_displayed_line > 1)
9303 			--s->first_displayed_line;
9304 		else
9305 			view->count = 0;
9306 		break;
9307 	case CTRL('u'):
9308 	case 'u':
9309 		nscroll /= 2;
9310 		/* FALL THROUGH */
9311 	case KEY_PPAGE:
9312 	case CTRL('b'):
9313 	case 'b':
9314 		if (s->first_displayed_line == 1) {
9315 			view->count = 0;
9316 			break;
9317 		}
9318 		while (--nscroll > 0 && s->first_displayed_line > 1)
9319 			s->first_displayed_line--;
9320 		break;
9321 	case 'j':
9322 	case KEY_DOWN:
9323 	case CTRL('n'):
9324 		if (!s->eof)
9325 			++s->first_displayed_line;
9326 		else
9327 			view->count = 0;
9328 		break;
9329 	case CTRL('d'):
9330 	case 'd':
9331 		nscroll /= 2;
9332 		/* FALL THROUGH */
9333 	case KEY_NPAGE:
9334 	case CTRL('f'):
9335 	case 'f':
9336 	case ' ':
9337 		if (s->eof) {
9338 			view->count = 0;
9339 			break;
9340 		}
9341 		while (!s->eof && --nscroll > 0) {
9342 			linelen = getline(&line, &linesz, s->f);
9343 			s->first_displayed_line++;
9344 			if (linelen == -1) {
9345 				if (feof(s->f))
9346 					s->eof = 1;
9347 				else
9348 					err = got_ferror(s->f, GOT_ERR_IO);
9349 				break;
9350 			}
9351 		}
9352 		free(line);
9353 		break;
9354 	default:
9355 		view->count = 0;
9356 		break;
9357 	}
9358 
9359 	return err;
9360 }
9361 
9362 static const struct got_error *
9363 close_help_view(struct tog_view *view)
9364 {
9365 	struct tog_help_view_state *s = &view->state.help;
9366 
9367 	free(s->line_offsets);
9368 	s->line_offsets = NULL;
9369 	if (fclose(s->f) == EOF)
9370 		return got_error_from_errno("fclose");
9371 
9372 	return NULL;
9373 }
9374 
9375 static const struct got_error *
9376 reset_help_view(struct tog_view *view)
9377 {
9378 	struct tog_help_view_state *s = &view->state.help;
9379 
9380 
9381 	if (s->f && fclose(s->f) == EOF)
9382 		return got_error_from_errno("fclose");
9383 
9384 	wclear(view->window);
9385 	view->count = 0;
9386 	view->x = 0;
9387 	s->all = !s->all;
9388 	s->first_displayed_line = 1;
9389 	s->last_displayed_line = view->nlines;
9390 	s->matched_line = 0;
9391 
9392 	return create_help(s);
9393 }
9394 
9395 static const struct got_error *
9396 open_help_view(struct tog_view *view, struct tog_view *parent)
9397 {
9398 	const struct got_error		*err = NULL;
9399 	struct tog_help_view_state	*s = &view->state.help;
9400 
9401 	s->type = (enum tog_keymap_type)parent->type;
9402 	s->first_displayed_line = 1;
9403 	s->last_displayed_line = view->nlines;
9404 	s->selected_line = 1;
9405 
9406 	view->show = show_help_view;
9407 	view->input = input_help_view;
9408 	view->reset = reset_help_view;
9409 	view->close = close_help_view;
9410 	view->search_start = search_start_help_view;
9411 	view->search_setup = search_setup_help_view;
9412 	view->search_next = search_next_view_match;
9413 
9414 	err = create_help(s);
9415 	return err;
9416 }
9417 
9418 static const struct got_error *
9419 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9420     enum tog_view_type request, int y, int x)
9421 {
9422 	const struct got_error *err = NULL;
9423 
9424 	*new_view = NULL;
9425 
9426 	switch (request) {
9427 	case TOG_VIEW_DIFF:
9428 		if (view->type == TOG_VIEW_LOG) {
9429 			struct tog_log_view_state *s = &view->state.log;
9430 
9431 			err = open_diff_view_for_commit(new_view, y, x,
9432 			    s->selected_entry->commit, s->selected_entry->id,
9433 			    view, s->repo);
9434 		} else
9435 			return got_error_msg(GOT_ERR_NOT_IMPL,
9436 			    "parent/child view pair not supported");
9437 		break;
9438 	case TOG_VIEW_BLAME:
9439 		if (view->type == TOG_VIEW_TREE) {
9440 			struct tog_tree_view_state *s = &view->state.tree;
9441 
9442 			err = blame_tree_entry(new_view, y, x,
9443 			    s->selected_entry, &s->parents, s->commit_id,
9444 			    s->repo);
9445 		} else
9446 			return got_error_msg(GOT_ERR_NOT_IMPL,
9447 			    "parent/child view pair not supported");
9448 		break;
9449 	case TOG_VIEW_LOG:
9450 		if (view->type == TOG_VIEW_BLAME)
9451 			err = log_annotated_line(new_view, y, x,
9452 			    view->state.blame.repo, view->state.blame.id_to_log);
9453 		else if (view->type == TOG_VIEW_TREE)
9454 			err = log_selected_tree_entry(new_view, y, x,
9455 			    &view->state.tree);
9456 		else if (view->type == TOG_VIEW_REF)
9457 			err = log_ref_entry(new_view, y, x,
9458 			    view->state.ref.selected_entry,
9459 			    view->state.ref.repo);
9460 		else
9461 			return got_error_msg(GOT_ERR_NOT_IMPL,
9462 			    "parent/child view pair not supported");
9463 		break;
9464 	case TOG_VIEW_TREE:
9465 		if (view->type == TOG_VIEW_LOG)
9466 			err = browse_commit_tree(new_view, y, x,
9467 			    view->state.log.selected_entry,
9468 			    view->state.log.in_repo_path,
9469 			    view->state.log.head_ref_name,
9470 			    view->state.log.repo);
9471 		else if (view->type == TOG_VIEW_REF)
9472 			err = browse_ref_tree(new_view, y, x,
9473 			    view->state.ref.selected_entry,
9474 			    view->state.ref.repo);
9475 		else
9476 			return got_error_msg(GOT_ERR_NOT_IMPL,
9477 			    "parent/child view pair not supported");
9478 		break;
9479 	case TOG_VIEW_REF:
9480 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9481 		if (*new_view == NULL)
9482 			return got_error_from_errno("view_open");
9483 		if (view->type == TOG_VIEW_LOG)
9484 			err = open_ref_view(*new_view, view->state.log.repo);
9485 		else if (view->type == TOG_VIEW_TREE)
9486 			err = open_ref_view(*new_view, view->state.tree.repo);
9487 		else
9488 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9489 			    "parent/child view pair not supported");
9490 		if (err)
9491 			view_close(*new_view);
9492 		break;
9493 	case TOG_VIEW_HELP:
9494 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9495 		if (*new_view == NULL)
9496 			return got_error_from_errno("view_open");
9497 		err = open_help_view(*new_view, view);
9498 		if (err)
9499 			view_close(*new_view);
9500 		break;
9501 	default:
9502 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9503 	}
9504 
9505 	return err;
9506 }
9507 
9508 /*
9509  * If view was scrolled down to move the selected line into view when opening a
9510  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9511  */
9512 static void
9513 offset_selection_up(struct tog_view *view)
9514 {
9515 	switch (view->type) {
9516 	case TOG_VIEW_BLAME: {
9517 		struct tog_blame_view_state *s = &view->state.blame;
9518 		if (s->first_displayed_line == 1) {
9519 			s->selected_line = MAX(s->selected_line - view->offset,
9520 			    1);
9521 			break;
9522 		}
9523 		if (s->first_displayed_line > view->offset)
9524 			s->first_displayed_line -= view->offset;
9525 		else
9526 			s->first_displayed_line = 1;
9527 		s->selected_line += view->offset;
9528 		break;
9529 	}
9530 	case TOG_VIEW_LOG:
9531 		log_scroll_up(&view->state.log, view->offset);
9532 		view->state.log.selected += view->offset;
9533 		break;
9534 	case TOG_VIEW_REF:
9535 		ref_scroll_up(&view->state.ref, view->offset);
9536 		view->state.ref.selected += view->offset;
9537 		break;
9538 	case TOG_VIEW_TREE:
9539 		tree_scroll_up(&view->state.tree, view->offset);
9540 		view->state.tree.selected += view->offset;
9541 		break;
9542 	default:
9543 		break;
9544 	}
9545 
9546 	view->offset = 0;
9547 }
9548 
9549 /*
9550  * If the selected line is in the section of screen covered by the bottom split,
9551  * scroll down offset lines to move it into view and index its new position.
9552  */
9553 static const struct got_error *
9554 offset_selection_down(struct tog_view *view)
9555 {
9556 	const struct got_error	*err = NULL;
9557 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9558 	int			*selected = NULL;
9559 	int			 header, offset;
9560 
9561 	switch (view->type) {
9562 	case TOG_VIEW_BLAME: {
9563 		struct tog_blame_view_state *s = &view->state.blame;
9564 		header = 3;
9565 		scrolld = NULL;
9566 		if (s->selected_line > view->nlines - header) {
9567 			offset = abs(view->nlines - s->selected_line - header);
9568 			s->first_displayed_line += offset;
9569 			s->selected_line -= offset;
9570 			view->offset = offset;
9571 		}
9572 		break;
9573 	}
9574 	case TOG_VIEW_LOG: {
9575 		struct tog_log_view_state *s = &view->state.log;
9576 		scrolld = &log_scroll_down;
9577 		header = view_is_parent_view(view) ? 3 : 2;
9578 		selected = &s->selected;
9579 		break;
9580 	}
9581 	case TOG_VIEW_REF: {
9582 		struct tog_ref_view_state *s = &view->state.ref;
9583 		scrolld = &ref_scroll_down;
9584 		header = 3;
9585 		selected = &s->selected;
9586 		break;
9587 	}
9588 	case TOG_VIEW_TREE: {
9589 		struct tog_tree_view_state *s = &view->state.tree;
9590 		scrolld = &tree_scroll_down;
9591 		header = 5;
9592 		selected = &s->selected;
9593 		break;
9594 	}
9595 	default:
9596 		selected = NULL;
9597 		scrolld = NULL;
9598 		header = 0;
9599 		break;
9600 	}
9601 
9602 	if (selected && *selected > view->nlines - header) {
9603 		offset = abs(view->nlines - *selected - header);
9604 		view->offset = offset;
9605 		if (scrolld && offset) {
9606 			err = scrolld(view, offset);
9607 			*selected -= offset;
9608 		}
9609 	}
9610 
9611 	return err;
9612 }
9613 
9614 static void
9615 list_commands(FILE *fp)
9616 {
9617 	size_t i;
9618 
9619 	fprintf(fp, "commands:");
9620 	for (i = 0; i < nitems(tog_commands); i++) {
9621 		const struct tog_cmd *cmd = &tog_commands[i];
9622 		fprintf(fp, " %s", cmd->name);
9623 	}
9624 	fputc('\n', fp);
9625 }
9626 
9627 __dead static void
9628 usage(int hflag, int status)
9629 {
9630 	FILE *fp = (status == 0) ? stdout : stderr;
9631 
9632 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9633 	    getprogname());
9634 	if (hflag) {
9635 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9636 		list_commands(fp);
9637 	}
9638 	exit(status);
9639 }
9640 
9641 static char **
9642 make_argv(int argc, ...)
9643 {
9644 	va_list ap;
9645 	char **argv;
9646 	int i;
9647 
9648 	va_start(ap, argc);
9649 
9650 	argv = calloc(argc, sizeof(char *));
9651 	if (argv == NULL)
9652 		err(1, "calloc");
9653 	for (i = 0; i < argc; i++) {
9654 		argv[i] = strdup(va_arg(ap, char *));
9655 		if (argv[i] == NULL)
9656 			err(1, "strdup");
9657 	}
9658 
9659 	va_end(ap);
9660 	return argv;
9661 }
9662 
9663 /*
9664  * Try to convert 'tog path' into a 'tog log path' command.
9665  * The user could simply have mistyped the command rather than knowingly
9666  * provided a path. So check whether argv[0] can in fact be resolved
9667  * to a path in the HEAD commit and print a special error if not.
9668  * This hack is for mpi@ <3
9669  */
9670 static const struct got_error *
9671 tog_log_with_path(int argc, char *argv[])
9672 {
9673 	const struct got_error *error = NULL, *close_err;
9674 	const struct tog_cmd *cmd = NULL;
9675 	struct got_repository *repo = NULL;
9676 	struct got_worktree *worktree = NULL;
9677 	struct got_object_id *commit_id = NULL, *id = NULL;
9678 	struct got_commit_object *commit = NULL;
9679 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9680 	char *commit_id_str = NULL, **cmd_argv = NULL;
9681 	int *pack_fds = NULL;
9682 
9683 	cwd = getcwd(NULL, 0);
9684 	if (cwd == NULL)
9685 		return got_error_from_errno("getcwd");
9686 
9687 	error = got_repo_pack_fds_open(&pack_fds);
9688 	if (error != NULL)
9689 		goto done;
9690 
9691 	error = got_worktree_open(&worktree, cwd);
9692 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9693 		goto done;
9694 
9695 	if (worktree)
9696 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9697 	else
9698 		repo_path = strdup(cwd);
9699 	if (repo_path == NULL) {
9700 		error = got_error_from_errno("strdup");
9701 		goto done;
9702 	}
9703 
9704 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9705 	if (error != NULL)
9706 		goto done;
9707 
9708 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9709 	    repo, worktree);
9710 	if (error)
9711 		goto done;
9712 
9713 	error = tog_load_refs(repo, 0);
9714 	if (error)
9715 		goto done;
9716 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9717 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9718 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9719 	if (error)
9720 		goto done;
9721 
9722 	if (worktree) {
9723 		got_worktree_close(worktree);
9724 		worktree = NULL;
9725 	}
9726 
9727 	error = got_object_open_as_commit(&commit, repo, commit_id);
9728 	if (error)
9729 		goto done;
9730 
9731 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9732 	if (error) {
9733 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9734 			goto done;
9735 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9736 		    getprogname(), argv[0]);
9737 		usage(1, 1);
9738 		/* not reached */
9739 	}
9740 
9741 	error = got_object_id_str(&commit_id_str, commit_id);
9742 	if (error)
9743 		goto done;
9744 
9745 	cmd = &tog_commands[0]; /* log */
9746 	argc = 4;
9747 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9748 	error = cmd->cmd_main(argc, cmd_argv);
9749 done:
9750 	if (repo) {
9751 		close_err = got_repo_close(repo);
9752 		if (error == NULL)
9753 			error = close_err;
9754 	}
9755 	if (commit)
9756 		got_object_commit_close(commit);
9757 	if (worktree)
9758 		got_worktree_close(worktree);
9759 	if (pack_fds) {
9760 		const struct got_error *pack_err =
9761 		    got_repo_pack_fds_close(pack_fds);
9762 		if (error == NULL)
9763 			error = pack_err;
9764 	}
9765 	free(id);
9766 	free(commit_id_str);
9767 	free(commit_id);
9768 	free(cwd);
9769 	free(repo_path);
9770 	free(in_repo_path);
9771 	if (cmd_argv) {
9772 		int i;
9773 		for (i = 0; i < argc; i++)
9774 			free(cmd_argv[i]);
9775 		free(cmd_argv);
9776 	}
9777 	tog_free_refs();
9778 	return error;
9779 }
9780 
9781 int
9782 main(int argc, char *argv[])
9783 {
9784 	const struct got_error *io_err, *error = NULL;
9785 	const struct tog_cmd *cmd = NULL;
9786 	int ch, hflag = 0, Vflag = 0;
9787 	char **cmd_argv = NULL;
9788 	static const struct option longopts[] = {
9789 	    { "version", no_argument, NULL, 'V' },
9790 	    { NULL, 0, NULL, 0}
9791 	};
9792 	char *diff_algo_str = NULL;
9793 	const char *test_script_path;
9794 
9795 	setlocale(LC_CTYPE, "");
9796 
9797 	/*
9798 	 * Test mode init must happen before pledge() because "tty" will
9799 	 * not allow TTY-related ioctls to occur via regular files.
9800 	 */
9801 	test_script_path = getenv("TOG_TEST_SCRIPT");
9802 	if (test_script_path != NULL) {
9803 		error = init_mock_term(test_script_path);
9804 		if (error) {
9805 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9806 			return 1;
9807 		}
9808 	} else if (!isatty(STDIN_FILENO))
9809 		errx(1, "standard input is not a tty");
9810 
9811 #if !defined(PROFILE)
9812 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9813 	    NULL) == -1)
9814 		err(1, "pledge");
9815 #endif
9816 
9817 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9818 		switch (ch) {
9819 		case 'h':
9820 			hflag = 1;
9821 			break;
9822 		case 'V':
9823 			Vflag = 1;
9824 			break;
9825 		default:
9826 			usage(hflag, 1);
9827 			/* NOTREACHED */
9828 		}
9829 	}
9830 
9831 	argc -= optind;
9832 	argv += optind;
9833 	optind = 1;
9834 	optreset = 1;
9835 
9836 	if (Vflag) {
9837 		got_version_print_str();
9838 		return 0;
9839 	}
9840 
9841 	if (argc == 0) {
9842 		if (hflag)
9843 			usage(hflag, 0);
9844 		/* Build an argument vector which runs a default command. */
9845 		cmd = &tog_commands[0];
9846 		argc = 1;
9847 		cmd_argv = make_argv(argc, cmd->name);
9848 	} else {
9849 		size_t i;
9850 
9851 		/* Did the user specify a command? */
9852 		for (i = 0; i < nitems(tog_commands); i++) {
9853 			if (strncmp(tog_commands[i].name, argv[0],
9854 			    strlen(argv[0])) == 0) {
9855 				cmd = &tog_commands[i];
9856 				break;
9857 			}
9858 		}
9859 	}
9860 
9861 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9862 	if (diff_algo_str) {
9863 		if (strcasecmp(diff_algo_str, "patience") == 0)
9864 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9865 		if (strcasecmp(diff_algo_str, "myers") == 0)
9866 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9867 	}
9868 
9869 	if (cmd == NULL) {
9870 		if (argc != 1)
9871 			usage(0, 1);
9872 		/* No command specified; try log with a path */
9873 		error = tog_log_with_path(argc, argv);
9874 	} else {
9875 		if (hflag)
9876 			cmd->cmd_usage();
9877 		else
9878 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9879 	}
9880 
9881 	if (using_mock_io) {
9882 		io_err = tog_io_close();
9883 		if (error == NULL)
9884 			error = io_err;
9885 	}
9886 	endwin();
9887 	if (cmd_argv) {
9888 		int i;
9889 		for (i = 0; i < argc; i++)
9890 			free(cmd_argv[i]);
9891 		free(cmd_argv);
9892 	}
9893 
9894 	if (error && error->code != GOT_ERR_CANCELLED &&
9895 	    error->code != GOT_ERR_EOF &&
9896 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9897 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9898 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9899 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9900 	return 0;
9901 }