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 <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g", "Go to line N (default: first line)"), \
537 	KEY_("Home =", "Go to the first line"), \
538 	KEY_("G", "Go to line N (default: last line)"), \
539 	KEY_("End *", "Go to the last line"), \
540 	KEY_("l Right", "Scroll the view right"), \
541 	KEY_("h Left", "Scroll the view left"), \
542 	KEY_("$", "Scroll view to the rightmost position"), \
543 	KEY_("0", "Scroll view to the leftmost position"), \
544 	KEY_("-", "Decrease size of the focussed split"), \
545 	KEY_("+", "Increase size of the focussed split"), \
546 	KEY_("Tab", "Switch focus between views"), \
547 	KEY_("F", "Toggle fullscreen mode"), \
548 	KEY_("/", "Open prompt to enter search term"), \
549 	KEY_("n", "Find next line/token matching the current search term"), \
550 	KEY_("N", "Find previous line/token matching the current search term"),\
551 	KEY_("q", "Quit the focussed view; Quit help screen"), \
552 	KEY_("Q", "Quit tog"), \
553 	\
554 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
555 	KEY_("< ,", "Move cursor up one commit"), \
556 	KEY_("> .", "Move cursor down one commit"), \
557 	KEY_("Enter", "Open diff view of the selected commit"), \
558 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
559 	KEY_("R", "Open ref view of all repository references"), \
560 	KEY_("T", "Display tree view of the repository from the selected" \
561 	    " commit"), \
562 	KEY_("@", "Toggle between displaying author and committer name"), \
563 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
564 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
565 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
566 	\
567 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
568 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
569 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
570 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
571 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
572 	    " data"), \
573 	KEY_("(", "Go to the previous file in the diff"), \
574 	KEY_(")", "Go to the next file in the diff"), \
575 	KEY_("{", "Go to the previous hunk in the diff"), \
576 	KEY_("}", "Go to the next hunk in the diff"), \
577 	KEY_("[", "Decrease the number of context lines"), \
578 	KEY_("]", "Increase the number of context lines"), \
579 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
580 	\
581 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
582 	KEY_("Enter", "Display diff view of the selected line's commit"), \
583 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
584 	KEY_("L", "Open log view for the currently selected annotated line"), \
585 	KEY_("C", "Reload view with the previously blamed commit"), \
586 	KEY_("c", "Reload view with the version of the file found in the" \
587 	    " selected line's commit"), \
588 	KEY_("p", "Reload view with the version of the file found in the" \
589 	    " selected line's parent commit"), \
590 	\
591 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
592 	KEY_("Enter", "Enter selected directory or open blame view of the" \
593 	    " selected file"), \
594 	KEY_("L", "Open log view for the selected entry"), \
595 	KEY_("R", "Open ref view of all repository references"), \
596 	KEY_("i", "Show object IDs for all tree entries"), \
597 	KEY_("Backspace", "Return to the parent directory"), \
598 	\
599 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
600 	KEY_("Enter", "Display log view of the selected reference"), \
601 	KEY_("T", "Display tree view of the selected reference"), \
602 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
603 	KEY_("m", "Toggle display of last modified date for each reference"), \
604 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
605 	KEY_("C-l", "Reload view with all repository references")
606 
607 struct tog_key_map {
608 	const char		*keys;
609 	const char		*info;
610 	enum tog_keymap_type	 type;
611 };
612 
613 /*
614  * We implement two types of views: parent views and child views.
615  *
616  * The 'Tab' key switches focus between a parent view and its child view.
617  * Child views are shown side-by-side to their parent view, provided
618  * there is enough screen estate.
619  *
620  * When a new view is opened from within a parent view, this new view
621  * becomes a child view of the parent view, replacing any existing child.
622  *
623  * When a new view is opened from within a child view, this new view
624  * becomes a parent view which will obscure the views below until the
625  * user quits the new parent view by typing 'q'.
626  *
627  * This list of views contains parent views only.
628  * Child views are only pointed to by their parent view.
629  */
630 TAILQ_HEAD(tog_view_list_head, tog_view);
631 
632 struct tog_view {
633 	TAILQ_ENTRY(tog_view) entry;
634 	WINDOW *window;
635 	PANEL *panel;
636 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
637 	int resized_y, resized_x; /* begin_y/x based on user resizing */
638 	int maxx, x; /* max column and current start column */
639 	int lines, cols; /* copies of LINES and COLS */
640 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
641 	int gline, hiline; /* navigate to and highlight this nG line */
642 	int ch, count; /* current keymap and count prefix */
643 	int resized; /* set when in a resize event */
644 	int focussed; /* Only set on one parent or child view at a time. */
645 	int dying;
646 	struct tog_view *parent;
647 	struct tog_view *child;
648 
649 	/*
650 	 * This flag is initially set on parent views when a new child view
651 	 * is created. It gets toggled when the 'Tab' key switches focus
652 	 * between parent and child.
653 	 * The flag indicates whether focus should be passed on to our child
654 	 * view if this parent view gets picked for focus after another parent
655 	 * view was closed. This prevents child views from losing focus in such
656 	 * situations.
657 	 */
658 	int focus_child;
659 
660 	enum tog_view_mode mode;
661 	/* type-specific state */
662 	enum tog_view_type type;
663 	union {
664 		struct tog_diff_view_state diff;
665 		struct tog_log_view_state log;
666 		struct tog_blame_view_state blame;
667 		struct tog_tree_view_state tree;
668 		struct tog_ref_view_state ref;
669 		struct tog_help_view_state help;
670 	} state;
671 
672 	const struct got_error *(*show)(struct tog_view *);
673 	const struct got_error *(*input)(struct tog_view **,
674 	    struct tog_view *, int);
675 	const struct got_error *(*reset)(struct tog_view *);
676 	const struct got_error *(*resize)(struct tog_view *, int);
677 	const struct got_error *(*close)(struct tog_view *);
678 
679 	const struct got_error *(*search_start)(struct tog_view *);
680 	const struct got_error *(*search_next)(struct tog_view *);
681 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
682 	    int **, int **, int **, int **);
683 	int search_started;
684 	int searching;
685 #define TOG_SEARCH_FORWARD	1
686 #define TOG_SEARCH_BACKWARD	2
687 	int search_next_done;
688 #define TOG_SEARCH_HAVE_MORE	1
689 #define TOG_SEARCH_NO_MORE	2
690 #define TOG_SEARCH_HAVE_NONE	3
691 	regex_t regex;
692 	regmatch_t regmatch;
693 };
694 
695 static const struct got_error *open_diff_view(struct tog_view *,
696     struct got_object_id *, struct got_object_id *,
697     const char *, const char *, int, int, int, struct tog_view *,
698     struct got_repository *);
699 static const struct got_error *show_diff_view(struct tog_view *);
700 static const struct got_error *input_diff_view(struct tog_view **,
701     struct tog_view *, int);
702 static const struct got_error *reset_diff_view(struct tog_view *);
703 static const struct got_error* close_diff_view(struct tog_view *);
704 static const struct got_error *search_start_diff_view(struct tog_view *);
705 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
706     size_t *, int **, int **, int **, int **);
707 static const struct got_error *search_next_view_match(struct tog_view *);
708 
709 static const struct got_error *open_log_view(struct tog_view *,
710     struct got_object_id *, struct got_repository *,
711     const char *, const char *, int);
712 static const struct got_error * show_log_view(struct tog_view *);
713 static const struct got_error *input_log_view(struct tog_view **,
714     struct tog_view *, int);
715 static const struct got_error *resize_log_view(struct tog_view *, int);
716 static const struct got_error *close_log_view(struct tog_view *);
717 static const struct got_error *search_start_log_view(struct tog_view *);
718 static const struct got_error *search_next_log_view(struct tog_view *);
719 
720 static const struct got_error *open_blame_view(struct tog_view *, char *,
721     struct got_object_id *, struct got_repository *);
722 static const struct got_error *show_blame_view(struct tog_view *);
723 static const struct got_error *input_blame_view(struct tog_view **,
724     struct tog_view *, int);
725 static const struct got_error *reset_blame_view(struct tog_view *);
726 static const struct got_error *close_blame_view(struct tog_view *);
727 static const struct got_error *search_start_blame_view(struct tog_view *);
728 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
729     size_t *, int **, int **, int **, int **);
730 
731 static const struct got_error *open_tree_view(struct tog_view *,
732     struct got_object_id *, const char *, struct got_repository *);
733 static const struct got_error *show_tree_view(struct tog_view *);
734 static const struct got_error *input_tree_view(struct tog_view **,
735     struct tog_view *, int);
736 static const struct got_error *close_tree_view(struct tog_view *);
737 static const struct got_error *search_start_tree_view(struct tog_view *);
738 static const struct got_error *search_next_tree_view(struct tog_view *);
739 
740 static const struct got_error *open_ref_view(struct tog_view *,
741     struct got_repository *);
742 static const struct got_error *show_ref_view(struct tog_view *);
743 static const struct got_error *input_ref_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *close_ref_view(struct tog_view *);
746 static const struct got_error *search_start_ref_view(struct tog_view *);
747 static const struct got_error *search_next_ref_view(struct tog_view *);
748 
749 static const struct got_error *open_help_view(struct tog_view *,
750     struct tog_view *);
751 static const struct got_error *show_help_view(struct tog_view *);
752 static const struct got_error *input_help_view(struct tog_view **,
753     struct tog_view *, int);
754 static const struct got_error *reset_help_view(struct tog_view *);
755 static const struct got_error* close_help_view(struct tog_view *);
756 static const struct got_error *search_start_help_view(struct tog_view *);
757 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
758     size_t *, int **, int **, int **, int **);
759 
760 static volatile sig_atomic_t tog_sigwinch_received;
761 static volatile sig_atomic_t tog_sigpipe_received;
762 static volatile sig_atomic_t tog_sigcont_received;
763 static volatile sig_atomic_t tog_sigint_received;
764 static volatile sig_atomic_t tog_sigterm_received;
765 
766 static void
767 tog_sigwinch(int signo)
768 {
769 	tog_sigwinch_received = 1;
770 }
771 
772 static void
773 tog_sigpipe(int signo)
774 {
775 	tog_sigpipe_received = 1;
776 }
777 
778 static void
779 tog_sigcont(int signo)
780 {
781 	tog_sigcont_received = 1;
782 }
783 
784 static void
785 tog_sigint(int signo)
786 {
787 	tog_sigint_received = 1;
788 }
789 
790 static void
791 tog_sigterm(int signo)
792 {
793 	tog_sigterm_received = 1;
794 }
795 
796 static int
797 tog_fatal_signal_received(void)
798 {
799 	return (tog_sigpipe_received ||
800 	    tog_sigint_received || tog_sigterm_received);
801 }
802 
803 static const struct got_error *
804 view_close(struct tog_view *view)
805 {
806 	const struct got_error *err = NULL, *child_err = NULL;
807 
808 	if (view->child) {
809 		child_err = view_close(view->child);
810 		view->child = NULL;
811 	}
812 	if (view->close)
813 		err = view->close(view);
814 	if (view->panel)
815 		del_panel(view->panel);
816 	if (view->window)
817 		delwin(view->window);
818 	free(view);
819 	return err ? err : child_err;
820 }
821 
822 static struct tog_view *
823 view_open(int nlines, int ncols, int begin_y, int begin_x,
824     enum tog_view_type type)
825 {
826 	struct tog_view *view = calloc(1, sizeof(*view));
827 
828 	if (view == NULL)
829 		return NULL;
830 
831 	view->type = type;
832 	view->lines = LINES;
833 	view->cols = COLS;
834 	view->nlines = nlines ? nlines : LINES - begin_y;
835 	view->ncols = ncols ? ncols : COLS - begin_x;
836 	view->begin_y = begin_y;
837 	view->begin_x = begin_x;
838 	view->window = newwin(nlines, ncols, begin_y, begin_x);
839 	if (view->window == NULL) {
840 		view_close(view);
841 		return NULL;
842 	}
843 	view->panel = new_panel(view->window);
844 	if (view->panel == NULL ||
845 	    set_panel_userptr(view->panel, view) != OK) {
846 		view_close(view);
847 		return NULL;
848 	}
849 
850 	keypad(view->window, TRUE);
851 	return view;
852 }
853 
854 static int
855 view_split_begin_x(int begin_x)
856 {
857 	if (begin_x > 0 || COLS < 120)
858 		return 0;
859 	return (COLS - MAX(COLS / 2, 80));
860 }
861 
862 /* XXX Stub till we decide what to do. */
863 static int
864 view_split_begin_y(int lines)
865 {
866 	return lines * HSPLIT_SCALE;
867 }
868 
869 static const struct got_error *view_resize(struct tog_view *);
870 
871 static const struct got_error *
872 view_splitscreen(struct tog_view *view)
873 {
874 	const struct got_error *err = NULL;
875 
876 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
877 		if (view->resized_y && view->resized_y < view->lines)
878 			view->begin_y = view->resized_y;
879 		else
880 			view->begin_y = view_split_begin_y(view->nlines);
881 		view->begin_x = 0;
882 	} else if (!view->resized) {
883 		if (view->resized_x && view->resized_x < view->cols - 1 &&
884 		    view->cols > 119)
885 			view->begin_x = view->resized_x;
886 		else
887 			view->begin_x = view_split_begin_x(0);
888 		view->begin_y = 0;
889 	}
890 	view->nlines = LINES - view->begin_y;
891 	view->ncols = COLS - view->begin_x;
892 	view->lines = LINES;
893 	view->cols = COLS;
894 	err = view_resize(view);
895 	if (err)
896 		return err;
897 
898 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
899 		view->parent->nlines = view->begin_y;
900 
901 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
902 		return got_error_from_errno("mvwin");
903 
904 	return NULL;
905 }
906 
907 static const struct got_error *
908 view_fullscreen(struct tog_view *view)
909 {
910 	const struct got_error *err = NULL;
911 
912 	view->begin_x = 0;
913 	view->begin_y = view->resized ? view->begin_y : 0;
914 	view->nlines = view->resized ? view->nlines : LINES;
915 	view->ncols = COLS;
916 	view->lines = LINES;
917 	view->cols = COLS;
918 	err = view_resize(view);
919 	if (err)
920 		return err;
921 
922 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
923 		return got_error_from_errno("mvwin");
924 
925 	return NULL;
926 }
927 
928 static int
929 view_is_parent_view(struct tog_view *view)
930 {
931 	return view->parent == NULL;
932 }
933 
934 static int
935 view_is_splitscreen(struct tog_view *view)
936 {
937 	return view->begin_x > 0 || view->begin_y > 0;
938 }
939 
940 static int
941 view_is_fullscreen(struct tog_view *view)
942 {
943 	return view->nlines == LINES && view->ncols == COLS;
944 }
945 
946 static int
947 view_is_hsplit_top(struct tog_view *view)
948 {
949 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
950 	    view_is_splitscreen(view->child);
951 }
952 
953 static void
954 view_border(struct tog_view *view)
955 {
956 	PANEL *panel;
957 	const struct tog_view *view_above;
958 
959 	if (view->parent)
960 		return view_border(view->parent);
961 
962 	panel = panel_above(view->panel);
963 	if (panel == NULL)
964 		return;
965 
966 	view_above = panel_userptr(panel);
967 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
968 		mvwhline(view->window, view_above->begin_y - 1,
969 		    view->begin_x, got_locale_is_utf8() ?
970 		    ACS_HLINE : '-', view->ncols);
971 	else
972 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
973 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
974 }
975 
976 static const struct got_error *view_init_hsplit(struct tog_view *, int);
977 static const struct got_error *request_log_commits(struct tog_view *);
978 static const struct got_error *offset_selection_down(struct tog_view *);
979 static void offset_selection_up(struct tog_view *);
980 static void view_get_split(struct tog_view *, int *, int *);
981 
982 static const struct got_error *
983 view_resize(struct tog_view *view)
984 {
985 	const struct got_error	*err = NULL;
986 	int			 dif, nlines, ncols;
987 
988 	dif = LINES - view->lines;  /* line difference */
989 
990 	if (view->lines > LINES)
991 		nlines = view->nlines - (view->lines - LINES);
992 	else
993 		nlines = view->nlines + (LINES - view->lines);
994 	if (view->cols > COLS)
995 		ncols = view->ncols - (view->cols - COLS);
996 	else
997 		ncols = view->ncols + (COLS - view->cols);
998 
999 	if (view->child) {
1000 		int hs = view->child->begin_y;
1001 
1002 		if (!view_is_fullscreen(view))
1003 			view->child->begin_x = view_split_begin_x(view->begin_x);
1004 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1005 		    view->child->begin_x == 0) {
1006 			ncols = COLS;
1007 
1008 			view_fullscreen(view->child);
1009 			if (view->child->focussed)
1010 				show_panel(view->child->panel);
1011 			else
1012 				show_panel(view->panel);
1013 		} else {
1014 			ncols = view->child->begin_x;
1015 
1016 			view_splitscreen(view->child);
1017 			show_panel(view->child->panel);
1018 		}
1019 		/*
1020 		 * XXX This is ugly and needs to be moved into the above
1021 		 * logic but "works" for now and my attempts at moving it
1022 		 * break either 'tab' or 'F' key maps in horizontal splits.
1023 		 */
1024 		if (hs) {
1025 			err = view_splitscreen(view->child);
1026 			if (err)
1027 				return err;
1028 			if (dif < 0) { /* top split decreased */
1029 				err = offset_selection_down(view);
1030 				if (err)
1031 					return err;
1032 			}
1033 			view_border(view);
1034 			update_panels();
1035 			doupdate();
1036 			show_panel(view->child->panel);
1037 			nlines = view->nlines;
1038 		}
1039 	} else if (view->parent == NULL)
1040 		ncols = COLS;
1041 
1042 	if (view->resize && dif > 0) {
1043 		err = view->resize(view, dif);
1044 		if (err)
1045 			return err;
1046 	}
1047 
1048 	if (wresize(view->window, nlines, ncols) == ERR)
1049 		return got_error_from_errno("wresize");
1050 	if (replace_panel(view->panel, view->window) == ERR)
1051 		return got_error_from_errno("replace_panel");
1052 	wclear(view->window);
1053 
1054 	view->nlines = nlines;
1055 	view->ncols = ncols;
1056 	view->lines = LINES;
1057 	view->cols = COLS;
1058 
1059 	return NULL;
1060 }
1061 
1062 static const struct got_error *
1063 resize_log_view(struct tog_view *view, int increase)
1064 {
1065 	struct tog_log_view_state	*s = &view->state.log;
1066 	const struct got_error		*err = NULL;
1067 	int				 n = 0;
1068 
1069 	if (s->selected_entry)
1070 		n = s->selected_entry->idx + view->lines - s->selected;
1071 
1072 	/*
1073 	 * Request commits to account for the increased
1074 	 * height so we have enough to populate the view.
1075 	 */
1076 	if (s->commits->ncommits < n) {
1077 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1078 		err = request_log_commits(view);
1079 	}
1080 
1081 	return err;
1082 }
1083 
1084 static void
1085 view_adjust_offset(struct tog_view *view, int n)
1086 {
1087 	if (n == 0)
1088 		return;
1089 
1090 	if (view->parent && view->parent->offset) {
1091 		if (view->parent->offset + n >= 0)
1092 			view->parent->offset += n;
1093 		else
1094 			view->parent->offset = 0;
1095 	} else if (view->offset) {
1096 		if (view->offset - n >= 0)
1097 			view->offset -= n;
1098 		else
1099 			view->offset = 0;
1100 	}
1101 }
1102 
1103 static const struct got_error *
1104 view_resize_split(struct tog_view *view, int resize)
1105 {
1106 	const struct got_error	*err = NULL;
1107 	struct tog_view		*v = NULL;
1108 
1109 	if (view->parent)
1110 		v = view->parent;
1111 	else
1112 		v = view;
1113 
1114 	if (!v->child || !view_is_splitscreen(v->child))
1115 		return NULL;
1116 
1117 	v->resized = v->child->resized = resize;  /* lock for resize event */
1118 
1119 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1120 		if (v->child->resized_y)
1121 			v->child->begin_y = v->child->resized_y;
1122 		if (view->parent)
1123 			v->child->begin_y -= resize;
1124 		else
1125 			v->child->begin_y += resize;
1126 		if (v->child->begin_y < 3) {
1127 			view->count = 0;
1128 			v->child->begin_y = 3;
1129 		} else if (v->child->begin_y > LINES - 1) {
1130 			view->count = 0;
1131 			v->child->begin_y = LINES - 1;
1132 		}
1133 		v->ncols = COLS;
1134 		v->child->ncols = COLS;
1135 		view_adjust_offset(view, resize);
1136 		err = view_init_hsplit(v, v->child->begin_y);
1137 		if (err)
1138 			return err;
1139 		v->child->resized_y = v->child->begin_y;
1140 	} else {
1141 		if (v->child->resized_x)
1142 			v->child->begin_x = v->child->resized_x;
1143 		if (view->parent)
1144 			v->child->begin_x -= resize;
1145 		else
1146 			v->child->begin_x += resize;
1147 		if (v->child->begin_x < 11) {
1148 			view->count = 0;
1149 			v->child->begin_x = 11;
1150 		} else if (v->child->begin_x > COLS - 1) {
1151 			view->count = 0;
1152 			v->child->begin_x = COLS - 1;
1153 		}
1154 		v->child->resized_x = v->child->begin_x;
1155 	}
1156 
1157 	v->child->mode = v->mode;
1158 	v->child->nlines = v->lines - v->child->begin_y;
1159 	v->child->ncols = v->cols - v->child->begin_x;
1160 	v->focus_child = 1;
1161 
1162 	err = view_fullscreen(v);
1163 	if (err)
1164 		return err;
1165 	err = view_splitscreen(v->child);
1166 	if (err)
1167 		return err;
1168 
1169 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1170 		err = offset_selection_down(v->child);
1171 		if (err)
1172 			return err;
1173 	}
1174 
1175 	if (v->resize)
1176 		err = v->resize(v, 0);
1177 	else if (v->child->resize)
1178 		err = v->child->resize(v->child, 0);
1179 
1180 	v->resized = v->child->resized = 0;
1181 
1182 	return err;
1183 }
1184 
1185 static void
1186 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1187 {
1188 	struct tog_view *v = src->child ? src->child : src;
1189 
1190 	dst->resized_x = v->resized_x;
1191 	dst->resized_y = v->resized_y;
1192 }
1193 
1194 static const struct got_error *
1195 view_close_child(struct tog_view *view)
1196 {
1197 	const struct got_error *err = NULL;
1198 
1199 	if (view->child == NULL)
1200 		return NULL;
1201 
1202 	err = view_close(view->child);
1203 	view->child = NULL;
1204 	return err;
1205 }
1206 
1207 static const struct got_error *
1208 view_set_child(struct tog_view *view, struct tog_view *child)
1209 {
1210 	const struct got_error *err = NULL;
1211 
1212 	view->child = child;
1213 	child->parent = view;
1214 
1215 	err = view_resize(view);
1216 	if (err)
1217 		return err;
1218 
1219 	if (view->child->resized_x || view->child->resized_y)
1220 		err = view_resize_split(view, 0);
1221 
1222 	return err;
1223 }
1224 
1225 static const struct got_error *view_dispatch_request(struct tog_view **,
1226     struct tog_view *, enum tog_view_type, int, int);
1227 
1228 static const struct got_error *
1229 view_request_new(struct tog_view **requested, struct tog_view *view,
1230     enum tog_view_type request)
1231 {
1232 	struct tog_view		*new_view = NULL;
1233 	const struct got_error	*err;
1234 	int			 y = 0, x = 0;
1235 
1236 	*requested = NULL;
1237 
1238 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1239 		view_get_split(view, &y, &x);
1240 
1241 	err = view_dispatch_request(&new_view, view, request, y, x);
1242 	if (err)
1243 		return err;
1244 
1245 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1246 	    request != TOG_VIEW_HELP) {
1247 		err = view_init_hsplit(view, y);
1248 		if (err)
1249 			return err;
1250 	}
1251 
1252 	view->focussed = 0;
1253 	new_view->focussed = 1;
1254 	new_view->mode = view->mode;
1255 	new_view->nlines = request == TOG_VIEW_HELP ?
1256 	    view->lines : view->lines - y;
1257 
1258 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1259 		view_transfer_size(new_view, view);
1260 		err = view_close_child(view);
1261 		if (err)
1262 			return err;
1263 		err = view_set_child(view, new_view);
1264 		if (err)
1265 			return err;
1266 		view->focus_child = 1;
1267 	} else
1268 		*requested = new_view;
1269 
1270 	return NULL;
1271 }
1272 
1273 static void
1274 tog_resizeterm(void)
1275 {
1276 	int cols, lines;
1277 	struct winsize size;
1278 
1279 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1280 		cols = 80;     /* Default */
1281 		lines = 24;
1282 	} else {
1283 		cols = size.ws_col;
1284 		lines = size.ws_row;
1285 	}
1286 	resize_term(lines, cols);
1287 }
1288 
1289 static const struct got_error *
1290 view_search_start(struct tog_view *view)
1291 {
1292 	const struct got_error *err = NULL;
1293 	struct tog_view *v = view;
1294 	char pattern[1024];
1295 	int ret;
1296 
1297 	if (view->search_started) {
1298 		regfree(&view->regex);
1299 		view->searching = 0;
1300 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1301 	}
1302 	view->search_started = 0;
1303 
1304 	if (view->nlines < 1)
1305 		return NULL;
1306 
1307 	if (view_is_hsplit_top(view))
1308 		v = view->child;
1309 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1310 		v = view->parent;
1311 
1312 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1313 	wclrtoeol(v->window);
1314 
1315 	nodelay(v->window, FALSE);  /* block for search term input */
1316 	nocbreak();
1317 	echo();
1318 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1319 	wrefresh(v->window);
1320 	cbreak();
1321 	noecho();
1322 	nodelay(v->window, TRUE);
1323 	if (ret == ERR)
1324 		return NULL;
1325 
1326 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1327 		err = view->search_start(view);
1328 		if (err) {
1329 			regfree(&view->regex);
1330 			return err;
1331 		}
1332 		view->search_started = 1;
1333 		view->searching = TOG_SEARCH_FORWARD;
1334 		view->search_next_done = 0;
1335 		view->search_next(view);
1336 	}
1337 
1338 	return NULL;
1339 }
1340 
1341 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1342 static const struct got_error *
1343 switch_split(struct tog_view *view)
1344 {
1345 	const struct got_error	*err = NULL;
1346 	struct tog_view		*v = NULL;
1347 
1348 	if (view->parent)
1349 		v = view->parent;
1350 	else
1351 		v = view;
1352 
1353 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1354 		v->mode = TOG_VIEW_SPLIT_VERT;
1355 	else
1356 		v->mode = TOG_VIEW_SPLIT_HRZN;
1357 
1358 	if (!v->child)
1359 		return NULL;
1360 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1361 		v->mode = TOG_VIEW_SPLIT_NONE;
1362 
1363 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1364 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1365 		v->child->begin_y = v->child->resized_y;
1366 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1367 		v->child->begin_x = v->child->resized_x;
1368 
1369 
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1371 		v->ncols = COLS;
1372 		v->child->ncols = COLS;
1373 		v->child->nscrolled = LINES - v->child->nlines;
1374 
1375 		err = view_init_hsplit(v, v->child->begin_y);
1376 		if (err)
1377 			return err;
1378 	}
1379 	v->child->mode = v->mode;
1380 	v->child->nlines = v->lines - v->child->begin_y;
1381 	v->focus_child = 1;
1382 
1383 	err = view_fullscreen(v);
1384 	if (err)
1385 		return err;
1386 	err = view_splitscreen(v->child);
1387 	if (err)
1388 		return err;
1389 
1390 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1391 		v->mode = TOG_VIEW_SPLIT_VERT;
1392 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1393 		err = offset_selection_down(v);
1394 		if (err)
1395 			return err;
1396 		err = offset_selection_down(v->child);
1397 		if (err)
1398 			return err;
1399 	} else {
1400 		offset_selection_up(v);
1401 		offset_selection_up(v->child);
1402 	}
1403 	if (v->resize)
1404 		err = v->resize(v, 0);
1405 	else if (v->child->resize)
1406 		err = v->child->resize(v->child, 0);
1407 
1408 	return err;
1409 }
1410 
1411 /*
1412  * Compute view->count from numeric input. Assign total to view->count and
1413  * return first non-numeric key entered.
1414  */
1415 static int
1416 get_compound_key(struct tog_view *view, int c)
1417 {
1418 	struct tog_view	*v = view;
1419 	int		 x, n = 0;
1420 
1421 	if (view_is_hsplit_top(view))
1422 		v = view->child;
1423 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1424 		v = view->parent;
1425 
1426 	view->count = 0;
1427 	cbreak();  /* block for input */
1428 	nodelay(view->window, FALSE);
1429 	wmove(v->window, v->nlines - 1, 0);
1430 	wclrtoeol(v->window);
1431 	waddch(v->window, ':');
1432 
1433 	do {
1434 		x = getcurx(v->window);
1435 		if (x != ERR && x < view->ncols) {
1436 			waddch(v->window, c);
1437 			wrefresh(v->window);
1438 		}
1439 
1440 		/*
1441 		 * Don't overflow. Max valid request should be the greatest
1442 		 * between the longest and total lines; cap at 10 million.
1443 		 */
1444 		if (n >= 9999999)
1445 			n = 9999999;
1446 		else
1447 			n = n * 10 + (c - '0');
1448 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1449 
1450 	if (c == 'G' || c == 'g') {	/* nG key map */
1451 		view->gline = view->hiline = n;
1452 		n = 0;
1453 		c = 0;
1454 	}
1455 
1456 	/* Massage excessive or inapplicable values at the input handler. */
1457 	view->count = n;
1458 
1459 	return c;
1460 }
1461 
1462 static const struct got_error *
1463 view_input(struct tog_view **new, int *done, struct tog_view *view,
1464     struct tog_view_list_head *views)
1465 {
1466 	const struct got_error *err = NULL;
1467 	struct tog_view *v;
1468 	int ch, errcode;
1469 
1470 	*new = NULL;
1471 
1472 	/* Clear "no matches" indicator. */
1473 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1474 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1475 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1476 		view->count = 0;
1477 	}
1478 
1479 	if (view->searching && !view->search_next_done) {
1480 		errcode = pthread_mutex_unlock(&tog_mutex);
1481 		if (errcode)
1482 			return got_error_set_errno(errcode,
1483 			    "pthread_mutex_unlock");
1484 		sched_yield();
1485 		errcode = pthread_mutex_lock(&tog_mutex);
1486 		if (errcode)
1487 			return got_error_set_errno(errcode,
1488 			    "pthread_mutex_lock");
1489 		view->search_next(view);
1490 		return NULL;
1491 	}
1492 
1493 	/* Allow threads to make progress while we are waiting for input. */
1494 	errcode = pthread_mutex_unlock(&tog_mutex);
1495 	if (errcode)
1496 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1497 	/* If we have an unfinished count, let C-g or backspace abort. */
1498 	if (view->count && --view->count) {
1499 		cbreak();
1500 		nodelay(view->window, TRUE);
1501 		ch = wgetch(view->window);
1502 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1503 			view->count = 0;
1504 		else
1505 			ch = view->ch;
1506 	} else {
1507 		ch = wgetch(view->window);
1508 		if (ch >= '1' && ch  <= '9')
1509 			view->ch = ch = get_compound_key(view, ch);
1510 	}
1511 	if (view->hiline && ch != ERR && ch != 0)
1512 		view->hiline = 0;  /* key pressed, clear line highlight */
1513 	nodelay(view->window, TRUE);
1514 	errcode = pthread_mutex_lock(&tog_mutex);
1515 	if (errcode)
1516 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1517 
1518 	if (tog_sigwinch_received || tog_sigcont_received) {
1519 		tog_resizeterm();
1520 		tog_sigwinch_received = 0;
1521 		tog_sigcont_received = 0;
1522 		TAILQ_FOREACH(v, views, entry) {
1523 			err = view_resize(v);
1524 			if (err)
1525 				return err;
1526 			err = v->input(new, v, KEY_RESIZE);
1527 			if (err)
1528 				return err;
1529 			if (v->child) {
1530 				err = view_resize(v->child);
1531 				if (err)
1532 					return err;
1533 				err = v->child->input(new, v->child,
1534 				    KEY_RESIZE);
1535 				if (err)
1536 					return err;
1537 				if (v->child->resized_x || v->child->resized_y) {
1538 					err = view_resize_split(v, 0);
1539 					if (err)
1540 						return err;
1541 				}
1542 			}
1543 		}
1544 	}
1545 
1546 	switch (ch) {
1547 	case '?':
1548 	case 'H':
1549 	case KEY_F(1):
1550 		if (view->type == TOG_VIEW_HELP)
1551 			err = view->reset(view);
1552 		else
1553 			err = view_request_new(new, view, TOG_VIEW_HELP);
1554 		break;
1555 	case '\t':
1556 		view->count = 0;
1557 		if (view->child) {
1558 			view->focussed = 0;
1559 			view->child->focussed = 1;
1560 			view->focus_child = 1;
1561 		} else if (view->parent) {
1562 			view->focussed = 0;
1563 			view->parent->focussed = 1;
1564 			view->parent->focus_child = 0;
1565 			if (!view_is_splitscreen(view)) {
1566 				if (view->parent->resize) {
1567 					err = view->parent->resize(view->parent,
1568 					    0);
1569 					if (err)
1570 						return err;
1571 				}
1572 				offset_selection_up(view->parent);
1573 				err = view_fullscreen(view->parent);
1574 				if (err)
1575 					return err;
1576 			}
1577 		}
1578 		break;
1579 	case 'q':
1580 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1581 			if (view->parent->resize) {
1582 				/* might need more commits to fill fullscreen */
1583 				err = view->parent->resize(view->parent, 0);
1584 				if (err)
1585 					break;
1586 			}
1587 			offset_selection_up(view->parent);
1588 		}
1589 		err = view->input(new, view, ch);
1590 		view->dying = 1;
1591 		break;
1592 	case 'Q':
1593 		*done = 1;
1594 		break;
1595 	case 'F':
1596 		view->count = 0;
1597 		if (view_is_parent_view(view)) {
1598 			if (view->child == NULL)
1599 				break;
1600 			if (view_is_splitscreen(view->child)) {
1601 				view->focussed = 0;
1602 				view->child->focussed = 1;
1603 				err = view_fullscreen(view->child);
1604 			} else {
1605 				err = view_splitscreen(view->child);
1606 				if (!err)
1607 					err = view_resize_split(view, 0);
1608 			}
1609 			if (err)
1610 				break;
1611 			err = view->child->input(new, view->child,
1612 			    KEY_RESIZE);
1613 		} else {
1614 			if (view_is_splitscreen(view)) {
1615 				view->parent->focussed = 0;
1616 				view->focussed = 1;
1617 				err = view_fullscreen(view);
1618 			} else {
1619 				err = view_splitscreen(view);
1620 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1621 					err = view_resize(view->parent);
1622 				if (!err)
1623 					err = view_resize_split(view, 0);
1624 			}
1625 			if (err)
1626 				break;
1627 			err = view->input(new, view, KEY_RESIZE);
1628 		}
1629 		if (err)
1630 			break;
1631 		if (view->resize) {
1632 			err = view->resize(view, 0);
1633 			if (err)
1634 				break;
1635 		}
1636 		if (view->parent)
1637 			err = offset_selection_down(view->parent);
1638 		if (!err)
1639 			err = offset_selection_down(view);
1640 		break;
1641 	case 'S':
1642 		view->count = 0;
1643 		err = switch_split(view);
1644 		break;
1645 	case '-':
1646 		err = view_resize_split(view, -1);
1647 		break;
1648 	case '+':
1649 		err = view_resize_split(view, 1);
1650 		break;
1651 	case KEY_RESIZE:
1652 		break;
1653 	case '/':
1654 		view->count = 0;
1655 		if (view->search_start)
1656 			view_search_start(view);
1657 		else
1658 			err = view->input(new, view, ch);
1659 		break;
1660 	case 'N':
1661 	case 'n':
1662 		if (view->search_started && view->search_next) {
1663 			view->searching = (ch == 'n' ?
1664 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1665 			view->search_next_done = 0;
1666 			view->search_next(view);
1667 		} else
1668 			err = view->input(new, view, ch);
1669 		break;
1670 	case 'A':
1671 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1672 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1673 		else
1674 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1675 		TAILQ_FOREACH(v, views, entry) {
1676 			if (v->reset) {
1677 				err = v->reset(v);
1678 				if (err)
1679 					return err;
1680 			}
1681 			if (v->child && v->child->reset) {
1682 				err = v->child->reset(v->child);
1683 				if (err)
1684 					return err;
1685 			}
1686 		}
1687 		break;
1688 	default:
1689 		err = view->input(new, view, ch);
1690 		break;
1691 	}
1692 
1693 	return err;
1694 }
1695 
1696 static int
1697 view_needs_focus_indication(struct tog_view *view)
1698 {
1699 	if (view_is_parent_view(view)) {
1700 		if (view->child == NULL || view->child->focussed)
1701 			return 0;
1702 		if (!view_is_splitscreen(view->child))
1703 			return 0;
1704 	} else if (!view_is_splitscreen(view))
1705 		return 0;
1706 
1707 	return view->focussed;
1708 }
1709 
1710 static const struct got_error *
1711 view_loop(struct tog_view *view)
1712 {
1713 	const struct got_error *err = NULL;
1714 	struct tog_view_list_head views;
1715 	struct tog_view *new_view;
1716 	char *mode;
1717 	int fast_refresh = 10;
1718 	int done = 0, errcode;
1719 
1720 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1721 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1722 		view->mode = TOG_VIEW_SPLIT_VERT;
1723 	else
1724 		view->mode = TOG_VIEW_SPLIT_HRZN;
1725 
1726 	errcode = pthread_mutex_lock(&tog_mutex);
1727 	if (errcode)
1728 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1729 
1730 	TAILQ_INIT(&views);
1731 	TAILQ_INSERT_HEAD(&views, view, entry);
1732 
1733 	view->focussed = 1;
1734 	err = view->show(view);
1735 	if (err)
1736 		return err;
1737 	update_panels();
1738 	doupdate();
1739 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1740 	    !tog_fatal_signal_received()) {
1741 		/* Refresh fast during initialization, then become slower. */
1742 		if (fast_refresh && fast_refresh-- == 0)
1743 			halfdelay(10); /* switch to once per second */
1744 
1745 		err = view_input(&new_view, &done, view, &views);
1746 		if (err)
1747 			break;
1748 		if (view->dying) {
1749 			struct tog_view *v, *prev = NULL;
1750 
1751 			if (view_is_parent_view(view))
1752 				prev = TAILQ_PREV(view, tog_view_list_head,
1753 				    entry);
1754 			else if (view->parent)
1755 				prev = view->parent;
1756 
1757 			if (view->parent) {
1758 				view->parent->child = NULL;
1759 				view->parent->focus_child = 0;
1760 				/* Restore fullscreen line height. */
1761 				view->parent->nlines = view->parent->lines;
1762 				err = view_resize(view->parent);
1763 				if (err)
1764 					break;
1765 				/* Make resized splits persist. */
1766 				view_transfer_size(view->parent, view);
1767 			} else
1768 				TAILQ_REMOVE(&views, view, entry);
1769 
1770 			err = view_close(view);
1771 			if (err)
1772 				goto done;
1773 
1774 			view = NULL;
1775 			TAILQ_FOREACH(v, &views, entry) {
1776 				if (v->focussed)
1777 					break;
1778 			}
1779 			if (view == NULL && new_view == NULL) {
1780 				/* No view has focus. Try to pick one. */
1781 				if (prev)
1782 					view = prev;
1783 				else if (!TAILQ_EMPTY(&views)) {
1784 					view = TAILQ_LAST(&views,
1785 					    tog_view_list_head);
1786 				}
1787 				if (view) {
1788 					if (view->focus_child) {
1789 						view->child->focussed = 1;
1790 						view = view->child;
1791 					} else
1792 						view->focussed = 1;
1793 				}
1794 			}
1795 		}
1796 		if (new_view) {
1797 			struct tog_view *v, *t;
1798 			/* Only allow one parent view per type. */
1799 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1800 				if (v->type != new_view->type)
1801 					continue;
1802 				TAILQ_REMOVE(&views, v, entry);
1803 				err = view_close(v);
1804 				if (err)
1805 					goto done;
1806 				break;
1807 			}
1808 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1809 			view = new_view;
1810 		}
1811 		if (view) {
1812 			if (view_is_parent_view(view)) {
1813 				if (view->child && view->child->focussed)
1814 					view = view->child;
1815 			} else {
1816 				if (view->parent && view->parent->focussed)
1817 					view = view->parent;
1818 			}
1819 			show_panel(view->panel);
1820 			if (view->child && view_is_splitscreen(view->child))
1821 				show_panel(view->child->panel);
1822 			if (view->parent && view_is_splitscreen(view)) {
1823 				err = view->parent->show(view->parent);
1824 				if (err)
1825 					goto done;
1826 			}
1827 			err = view->show(view);
1828 			if (err)
1829 				goto done;
1830 			if (view->child) {
1831 				err = view->child->show(view->child);
1832 				if (err)
1833 					goto done;
1834 			}
1835 			update_panels();
1836 			doupdate();
1837 		}
1838 	}
1839 done:
1840 	while (!TAILQ_EMPTY(&views)) {
1841 		const struct got_error *close_err;
1842 		view = TAILQ_FIRST(&views);
1843 		TAILQ_REMOVE(&views, view, entry);
1844 		close_err = view_close(view);
1845 		if (close_err && err == NULL)
1846 			err = close_err;
1847 	}
1848 
1849 	errcode = pthread_mutex_unlock(&tog_mutex);
1850 	if (errcode && err == NULL)
1851 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1852 
1853 	return err;
1854 }
1855 
1856 __dead static void
1857 usage_log(void)
1858 {
1859 	endwin();
1860 	fprintf(stderr,
1861 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1862 	    getprogname());
1863 	exit(1);
1864 }
1865 
1866 /* Create newly allocated wide-character string equivalent to a byte string. */
1867 static const struct got_error *
1868 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1869 {
1870 	char *vis = NULL;
1871 	const struct got_error *err = NULL;
1872 
1873 	*ws = NULL;
1874 	*wlen = mbstowcs(NULL, s, 0);
1875 	if (*wlen == (size_t)-1) {
1876 		int vislen;
1877 		if (errno != EILSEQ)
1878 			return got_error_from_errno("mbstowcs");
1879 
1880 		/* byte string invalid in current encoding; try to "fix" it */
1881 		err = got_mbsavis(&vis, &vislen, s);
1882 		if (err)
1883 			return err;
1884 		*wlen = mbstowcs(NULL, vis, 0);
1885 		if (*wlen == (size_t)-1) {
1886 			err = got_error_from_errno("mbstowcs"); /* give up */
1887 			goto done;
1888 		}
1889 	}
1890 
1891 	*ws = calloc(*wlen + 1, sizeof(**ws));
1892 	if (*ws == NULL) {
1893 		err = got_error_from_errno("calloc");
1894 		goto done;
1895 	}
1896 
1897 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1898 		err = got_error_from_errno("mbstowcs");
1899 done:
1900 	free(vis);
1901 	if (err) {
1902 		free(*ws);
1903 		*ws = NULL;
1904 		*wlen = 0;
1905 	}
1906 	return err;
1907 }
1908 
1909 static const struct got_error *
1910 expand_tab(char **ptr, const char *src)
1911 {
1912 	char	*dst;
1913 	size_t	 len, n, idx = 0, sz = 0;
1914 
1915 	*ptr = NULL;
1916 	n = len = strlen(src);
1917 	dst = malloc(n + 1);
1918 	if (dst == NULL)
1919 		return got_error_from_errno("malloc");
1920 
1921 	while (idx < len && src[idx]) {
1922 		const char c = src[idx];
1923 
1924 		if (c == '\t') {
1925 			size_t nb = TABSIZE - sz % TABSIZE;
1926 			char *p;
1927 
1928 			p = realloc(dst, n + nb);
1929 			if (p == NULL) {
1930 				free(dst);
1931 				return got_error_from_errno("realloc");
1932 
1933 			}
1934 			dst = p;
1935 			n += nb;
1936 			memset(dst + sz, ' ', nb);
1937 			sz += nb;
1938 		} else
1939 			dst[sz++] = src[idx];
1940 		++idx;
1941 	}
1942 
1943 	dst[sz] = '\0';
1944 	*ptr = dst;
1945 	return NULL;
1946 }
1947 
1948 /*
1949  * Advance at most n columns from wline starting at offset off.
1950  * Return the index to the first character after the span operation.
1951  * Return the combined column width of all spanned wide character in
1952  * *rcol.
1953  */
1954 static int
1955 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1956 {
1957 	int width, i, cols = 0;
1958 
1959 	if (n == 0) {
1960 		*rcol = cols;
1961 		return off;
1962 	}
1963 
1964 	for (i = off; wline[i] != L'\0'; ++i) {
1965 		if (wline[i] == L'\t')
1966 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1967 		else
1968 			width = wcwidth(wline[i]);
1969 
1970 		if (width == -1) {
1971 			width = 1;
1972 			wline[i] = L'.';
1973 		}
1974 
1975 		if (cols + width > n)
1976 			break;
1977 		cols += width;
1978 	}
1979 
1980 	*rcol = cols;
1981 	return i;
1982 }
1983 
1984 /*
1985  * Format a line for display, ensuring that it won't overflow a width limit.
1986  * With scrolling, the width returned refers to the scrolled version of the
1987  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1988  */
1989 static const struct got_error *
1990 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1991     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1992 {
1993 	const struct got_error *err = NULL;
1994 	int cols;
1995 	wchar_t *wline = NULL;
1996 	char *exstr = NULL;
1997 	size_t wlen;
1998 	int i, scrollx;
1999 
2000 	*wlinep = NULL;
2001 	*widthp = 0;
2002 
2003 	if (expand) {
2004 		err = expand_tab(&exstr, line);
2005 		if (err)
2006 			return err;
2007 	}
2008 
2009 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2010 	free(exstr);
2011 	if (err)
2012 		return err;
2013 
2014 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2015 
2016 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2017 		wline[wlen - 1] = L'\0';
2018 		wlen--;
2019 	}
2020 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2021 		wline[wlen - 1] = L'\0';
2022 		wlen--;
2023 	}
2024 
2025 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2026 	wline[i] = L'\0';
2027 
2028 	if (widthp)
2029 		*widthp = cols;
2030 	if (scrollxp)
2031 		*scrollxp = scrollx;
2032 	if (err)
2033 		free(wline);
2034 	else
2035 		*wlinep = wline;
2036 	return err;
2037 }
2038 
2039 static const struct got_error*
2040 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2041     struct got_object_id *id, struct got_repository *repo)
2042 {
2043 	static const struct got_error *err = NULL;
2044 	struct got_reflist_entry *re;
2045 	char *s;
2046 	const char *name;
2047 
2048 	*refs_str = NULL;
2049 
2050 	TAILQ_FOREACH(re, refs, entry) {
2051 		struct got_tag_object *tag = NULL;
2052 		struct got_object_id *ref_id;
2053 		int cmp;
2054 
2055 		name = got_ref_get_name(re->ref);
2056 		if (strcmp(name, GOT_REF_HEAD) == 0)
2057 			continue;
2058 		if (strncmp(name, "refs/", 5) == 0)
2059 			name += 5;
2060 		if (strncmp(name, "got/", 4) == 0 &&
2061 		    strncmp(name, "got/backup/", 11) != 0)
2062 			continue;
2063 		if (strncmp(name, "heads/", 6) == 0)
2064 			name += 6;
2065 		if (strncmp(name, "remotes/", 8) == 0) {
2066 			name += 8;
2067 			s = strstr(name, "/" GOT_REF_HEAD);
2068 			if (s != NULL && s[strlen(s)] == '\0')
2069 				continue;
2070 		}
2071 		err = got_ref_resolve(&ref_id, repo, re->ref);
2072 		if (err)
2073 			break;
2074 		if (strncmp(name, "tags/", 5) == 0) {
2075 			err = got_object_open_as_tag(&tag, repo, ref_id);
2076 			if (err) {
2077 				if (err->code != GOT_ERR_OBJ_TYPE) {
2078 					free(ref_id);
2079 					break;
2080 				}
2081 				/* Ref points at something other than a tag. */
2082 				err = NULL;
2083 				tag = NULL;
2084 			}
2085 		}
2086 		cmp = got_object_id_cmp(tag ?
2087 		    got_object_tag_get_object_id(tag) : ref_id, id);
2088 		free(ref_id);
2089 		if (tag)
2090 			got_object_tag_close(tag);
2091 		if (cmp != 0)
2092 			continue;
2093 		s = *refs_str;
2094 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2095 		    s ? ", " : "", name) == -1) {
2096 			err = got_error_from_errno("asprintf");
2097 			free(s);
2098 			*refs_str = NULL;
2099 			break;
2100 		}
2101 		free(s);
2102 	}
2103 
2104 	return err;
2105 }
2106 
2107 static const struct got_error *
2108 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2109     int col_tab_align)
2110 {
2111 	char *smallerthan;
2112 
2113 	smallerthan = strchr(author, '<');
2114 	if (smallerthan && smallerthan[1] != '\0')
2115 		author = smallerthan + 1;
2116 	author[strcspn(author, "@>")] = '\0';
2117 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2118 	    col_tab_align, 0);
2119 }
2120 
2121 static const struct got_error *
2122 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2123     struct got_object_id *id, const size_t date_display_cols,
2124     int author_display_cols)
2125 {
2126 	struct tog_log_view_state *s = &view->state.log;
2127 	const struct got_error *err = NULL;
2128 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2129 	char *logmsg0 = NULL, *logmsg = NULL;
2130 	char *author = NULL;
2131 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2132 	int author_width, logmsg_width;
2133 	char *newline, *line = NULL;
2134 	int col, limit, scrollx;
2135 	const int avail = view->ncols;
2136 	struct tm tm;
2137 	time_t committer_time;
2138 	struct tog_color *tc;
2139 
2140 	committer_time = got_object_commit_get_committer_time(commit);
2141 	if (gmtime_r(&committer_time, &tm) == NULL)
2142 		return got_error_from_errno("gmtime_r");
2143 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2144 		return got_error(GOT_ERR_NO_SPACE);
2145 
2146 	if (avail <= date_display_cols)
2147 		limit = MIN(sizeof(datebuf) - 1, avail);
2148 	else
2149 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2150 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2151 	if (tc)
2152 		wattr_on(view->window,
2153 		    COLOR_PAIR(tc->colorpair), NULL);
2154 	waddnstr(view->window, datebuf, limit);
2155 	if (tc)
2156 		wattr_off(view->window,
2157 		    COLOR_PAIR(tc->colorpair), NULL);
2158 	col = limit;
2159 	if (col > avail)
2160 		goto done;
2161 
2162 	if (avail >= 120) {
2163 		char *id_str;
2164 		err = got_object_id_str(&id_str, id);
2165 		if (err)
2166 			goto done;
2167 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2168 		if (tc)
2169 			wattr_on(view->window,
2170 			    COLOR_PAIR(tc->colorpair), NULL);
2171 		wprintw(view->window, "%.8s ", id_str);
2172 		if (tc)
2173 			wattr_off(view->window,
2174 			    COLOR_PAIR(tc->colorpair), NULL);
2175 		free(id_str);
2176 		col += 9;
2177 		if (col > avail)
2178 			goto done;
2179 	}
2180 
2181 	if (s->use_committer)
2182 		author = strdup(got_object_commit_get_committer(commit));
2183 	else
2184 		author = strdup(got_object_commit_get_author(commit));
2185 	if (author == NULL) {
2186 		err = got_error_from_errno("strdup");
2187 		goto done;
2188 	}
2189 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2190 	if (err)
2191 		goto done;
2192 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2193 	if (tc)
2194 		wattr_on(view->window,
2195 		    COLOR_PAIR(tc->colorpair), NULL);
2196 	waddwstr(view->window, wauthor);
2197 	col += author_width;
2198 	while (col < avail && author_width < author_display_cols + 2) {
2199 		waddch(view->window, ' ');
2200 		col++;
2201 		author_width++;
2202 	}
2203 	if (tc)
2204 		wattr_off(view->window,
2205 		    COLOR_PAIR(tc->colorpair), NULL);
2206 	if (col > avail)
2207 		goto done;
2208 
2209 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2210 	if (err)
2211 		goto done;
2212 	logmsg = logmsg0;
2213 	while (*logmsg == '\n')
2214 		logmsg++;
2215 	newline = strchr(logmsg, '\n');
2216 	if (newline)
2217 		*newline = '\0';
2218 	limit = avail - col;
2219 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2220 		limit--;	/* for the border */
2221 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2222 	    limit, col, 1);
2223 	if (err)
2224 		goto done;
2225 	waddwstr(view->window, &wlogmsg[scrollx]);
2226 	col += MAX(logmsg_width, 0);
2227 	while (col < avail) {
2228 		waddch(view->window, ' ');
2229 		col++;
2230 	}
2231 done:
2232 	free(logmsg0);
2233 	free(wlogmsg);
2234 	free(author);
2235 	free(wauthor);
2236 	free(line);
2237 	return err;
2238 }
2239 
2240 static struct commit_queue_entry *
2241 alloc_commit_queue_entry(struct got_commit_object *commit,
2242     struct got_object_id *id)
2243 {
2244 	struct commit_queue_entry *entry;
2245 	struct got_object_id *dup;
2246 
2247 	entry = calloc(1, sizeof(*entry));
2248 	if (entry == NULL)
2249 		return NULL;
2250 
2251 	dup = got_object_id_dup(id);
2252 	if (dup == NULL) {
2253 		free(entry);
2254 		return NULL;
2255 	}
2256 
2257 	entry->id = dup;
2258 	entry->commit = commit;
2259 	return entry;
2260 }
2261 
2262 static void
2263 pop_commit(struct commit_queue *commits)
2264 {
2265 	struct commit_queue_entry *entry;
2266 
2267 	entry = TAILQ_FIRST(&commits->head);
2268 	TAILQ_REMOVE(&commits->head, entry, entry);
2269 	got_object_commit_close(entry->commit);
2270 	commits->ncommits--;
2271 	free(entry->id);
2272 	free(entry);
2273 }
2274 
2275 static void
2276 free_commits(struct commit_queue *commits)
2277 {
2278 	while (!TAILQ_EMPTY(&commits->head))
2279 		pop_commit(commits);
2280 }
2281 
2282 static const struct got_error *
2283 match_commit(int *have_match, struct got_object_id *id,
2284     struct got_commit_object *commit, regex_t *regex)
2285 {
2286 	const struct got_error *err = NULL;
2287 	regmatch_t regmatch;
2288 	char *id_str = NULL, *logmsg = NULL;
2289 
2290 	*have_match = 0;
2291 
2292 	err = got_object_id_str(&id_str, id);
2293 	if (err)
2294 		return err;
2295 
2296 	err = got_object_commit_get_logmsg(&logmsg, commit);
2297 	if (err)
2298 		goto done;
2299 
2300 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2301 	    &regmatch, 0) == 0 ||
2302 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2303 	    &regmatch, 0) == 0 ||
2304 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2305 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2306 		*have_match = 1;
2307 done:
2308 	free(id_str);
2309 	free(logmsg);
2310 	return err;
2311 }
2312 
2313 static const struct got_error *
2314 queue_commits(struct tog_log_thread_args *a)
2315 {
2316 	const struct got_error *err = NULL;
2317 
2318 	/*
2319 	 * We keep all commits open throughout the lifetime of the log
2320 	 * view in order to avoid having to re-fetch commits from disk
2321 	 * while updating the display.
2322 	 */
2323 	do {
2324 		struct got_object_id id;
2325 		struct got_commit_object *commit;
2326 		struct commit_queue_entry *entry;
2327 		int limit_match = 0;
2328 		int errcode;
2329 
2330 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2331 		    NULL, NULL);
2332 		if (err)
2333 			break;
2334 
2335 		err = got_object_open_as_commit(&commit, a->repo, &id);
2336 		if (err)
2337 			break;
2338 		entry = alloc_commit_queue_entry(commit, &id);
2339 		if (entry == NULL) {
2340 			err = got_error_from_errno("alloc_commit_queue_entry");
2341 			break;
2342 		}
2343 
2344 		errcode = pthread_mutex_lock(&tog_mutex);
2345 		if (errcode) {
2346 			err = got_error_set_errno(errcode,
2347 			    "pthread_mutex_lock");
2348 			break;
2349 		}
2350 
2351 		entry->idx = a->real_commits->ncommits;
2352 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2353 		a->real_commits->ncommits++;
2354 
2355 		if (*a->limiting) {
2356 			err = match_commit(&limit_match, &id, commit,
2357 			    a->limit_regex);
2358 			if (err)
2359 				break;
2360 
2361 			if (limit_match) {
2362 				struct commit_queue_entry *matched;
2363 
2364 				matched = alloc_commit_queue_entry(
2365 				    entry->commit, entry->id);
2366 				if (matched == NULL) {
2367 					err = got_error_from_errno(
2368 					    "alloc_commit_queue_entry");
2369 					break;
2370 				}
2371 				matched->commit = entry->commit;
2372 				got_object_commit_retain(entry->commit);
2373 
2374 				matched->idx = a->limit_commits->ncommits;
2375 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2376 				    matched, entry);
2377 				a->limit_commits->ncommits++;
2378 			}
2379 
2380 			/*
2381 			 * This is how we signal log_thread() that we
2382 			 * have found a match, and that it should be
2383 			 * counted as a new entry for the view.
2384 			 */
2385 			a->limit_match = limit_match;
2386 		}
2387 
2388 		if (*a->searching == TOG_SEARCH_FORWARD &&
2389 		    !*a->search_next_done) {
2390 			int have_match;
2391 			err = match_commit(&have_match, &id, commit, a->regex);
2392 			if (err)
2393 				break;
2394 
2395 			if (*a->limiting) {
2396 				if (limit_match && have_match)
2397 					*a->search_next_done =
2398 					    TOG_SEARCH_HAVE_MORE;
2399 			} else if (have_match)
2400 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2401 		}
2402 
2403 		errcode = pthread_mutex_unlock(&tog_mutex);
2404 		if (errcode && err == NULL)
2405 			err = got_error_set_errno(errcode,
2406 			    "pthread_mutex_unlock");
2407 		if (err)
2408 			break;
2409 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2410 
2411 	return err;
2412 }
2413 
2414 static void
2415 select_commit(struct tog_log_view_state *s)
2416 {
2417 	struct commit_queue_entry *entry;
2418 	int ncommits = 0;
2419 
2420 	entry = s->first_displayed_entry;
2421 	while (entry) {
2422 		if (ncommits == s->selected) {
2423 			s->selected_entry = entry;
2424 			break;
2425 		}
2426 		entry = TAILQ_NEXT(entry, entry);
2427 		ncommits++;
2428 	}
2429 }
2430 
2431 static const struct got_error *
2432 draw_commits(struct tog_view *view)
2433 {
2434 	const struct got_error *err = NULL;
2435 	struct tog_log_view_state *s = &view->state.log;
2436 	struct commit_queue_entry *entry = s->selected_entry;
2437 	int limit = view->nlines;
2438 	int width;
2439 	int ncommits, author_cols = 4;
2440 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2441 	char *refs_str = NULL;
2442 	wchar_t *wline;
2443 	struct tog_color *tc;
2444 	static const size_t date_display_cols = 12;
2445 
2446 	if (view_is_hsplit_top(view))
2447 		--limit;  /* account for border */
2448 
2449 	if (s->selected_entry &&
2450 	    !(view->searching && view->search_next_done == 0)) {
2451 		struct got_reflist_head *refs;
2452 		err = got_object_id_str(&id_str, s->selected_entry->id);
2453 		if (err)
2454 			return err;
2455 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2456 		    s->selected_entry->id);
2457 		if (refs) {
2458 			err = build_refs_str(&refs_str, refs,
2459 			    s->selected_entry->id, s->repo);
2460 			if (err)
2461 				goto done;
2462 		}
2463 	}
2464 
2465 	if (s->thread_args.commits_needed == 0)
2466 		halfdelay(10); /* disable fast refresh */
2467 
2468 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2469 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2470 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2471 		    (view->searching && !view->search_next_done) ?
2472 		    "searching..." : "loading...") == -1) {
2473 			err = got_error_from_errno("asprintf");
2474 			goto done;
2475 		}
2476 	} else {
2477 		const char *search_str = NULL;
2478 		const char *limit_str = NULL;
2479 
2480 		if (view->searching) {
2481 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2482 				search_str = "no more matches";
2483 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2484 				search_str = "no matches found";
2485 			else if (!view->search_next_done)
2486 				search_str = "searching...";
2487 		}
2488 
2489 		if (s->limit_view && s->commits->ncommits == 0)
2490 			limit_str = "no matches found";
2491 
2492 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2493 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2494 		    search_str ? search_str : (refs_str ? refs_str : ""),
2495 		    limit_str ? limit_str : "") == -1) {
2496 			err = got_error_from_errno("asprintf");
2497 			goto done;
2498 		}
2499 	}
2500 
2501 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2502 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2503 		    "........................................",
2504 		    s->in_repo_path, ncommits_str) == -1) {
2505 			err = got_error_from_errno("asprintf");
2506 			header = NULL;
2507 			goto done;
2508 		}
2509 	} else if (asprintf(&header, "commit %s%s",
2510 	    id_str ? id_str : "........................................",
2511 	    ncommits_str) == -1) {
2512 		err = got_error_from_errno("asprintf");
2513 		header = NULL;
2514 		goto done;
2515 	}
2516 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2517 	if (err)
2518 		goto done;
2519 
2520 	werase(view->window);
2521 
2522 	if (view_needs_focus_indication(view))
2523 		wstandout(view->window);
2524 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2525 	if (tc)
2526 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2527 	waddwstr(view->window, wline);
2528 	while (width < view->ncols) {
2529 		waddch(view->window, ' ');
2530 		width++;
2531 	}
2532 	if (tc)
2533 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2534 	if (view_needs_focus_indication(view))
2535 		wstandend(view->window);
2536 	free(wline);
2537 	if (limit <= 1)
2538 		goto done;
2539 
2540 	/* Grow author column size if necessary, and set view->maxx. */
2541 	entry = s->first_displayed_entry;
2542 	ncommits = 0;
2543 	view->maxx = 0;
2544 	while (entry) {
2545 		struct got_commit_object *c = entry->commit;
2546 		char *author, *eol, *msg, *msg0;
2547 		wchar_t *wauthor, *wmsg;
2548 		int width;
2549 		if (ncommits >= limit - 1)
2550 			break;
2551 		if (s->use_committer)
2552 			author = strdup(got_object_commit_get_committer(c));
2553 		else
2554 			author = strdup(got_object_commit_get_author(c));
2555 		if (author == NULL) {
2556 			err = got_error_from_errno("strdup");
2557 			goto done;
2558 		}
2559 		err = format_author(&wauthor, &width, author, COLS,
2560 		    date_display_cols);
2561 		if (author_cols < width)
2562 			author_cols = width;
2563 		free(wauthor);
2564 		free(author);
2565 		if (err)
2566 			goto done;
2567 		err = got_object_commit_get_logmsg(&msg0, c);
2568 		if (err)
2569 			goto done;
2570 		msg = msg0;
2571 		while (*msg == '\n')
2572 			++msg;
2573 		if ((eol = strchr(msg, '\n')))
2574 			*eol = '\0';
2575 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2576 		    date_display_cols + author_cols, 0);
2577 		if (err)
2578 			goto done;
2579 		view->maxx = MAX(view->maxx, width);
2580 		free(msg0);
2581 		free(wmsg);
2582 		ncommits++;
2583 		entry = TAILQ_NEXT(entry, entry);
2584 	}
2585 
2586 	entry = s->first_displayed_entry;
2587 	s->last_displayed_entry = s->first_displayed_entry;
2588 	ncommits = 0;
2589 	while (entry) {
2590 		if (ncommits >= limit - 1)
2591 			break;
2592 		if (ncommits == s->selected)
2593 			wstandout(view->window);
2594 		err = draw_commit(view, entry->commit, entry->id,
2595 		    date_display_cols, author_cols);
2596 		if (ncommits == s->selected)
2597 			wstandend(view->window);
2598 		if (err)
2599 			goto done;
2600 		ncommits++;
2601 		s->last_displayed_entry = entry;
2602 		entry = TAILQ_NEXT(entry, entry);
2603 	}
2604 
2605 	view_border(view);
2606 done:
2607 	free(id_str);
2608 	free(refs_str);
2609 	free(ncommits_str);
2610 	free(header);
2611 	return err;
2612 }
2613 
2614 static void
2615 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2616 {
2617 	struct commit_queue_entry *entry;
2618 	int nscrolled = 0;
2619 
2620 	entry = TAILQ_FIRST(&s->commits->head);
2621 	if (s->first_displayed_entry == entry)
2622 		return;
2623 
2624 	entry = s->first_displayed_entry;
2625 	while (entry && nscrolled < maxscroll) {
2626 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2627 		if (entry) {
2628 			s->first_displayed_entry = entry;
2629 			nscrolled++;
2630 		}
2631 	}
2632 }
2633 
2634 static const struct got_error *
2635 trigger_log_thread(struct tog_view *view, int wait)
2636 {
2637 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2638 	int errcode;
2639 
2640 	halfdelay(1); /* fast refresh while loading commits */
2641 
2642 	while (!ta->log_complete && !tog_thread_error &&
2643 	    (ta->commits_needed > 0 || ta->load_all)) {
2644 		/* Wake the log thread. */
2645 		errcode = pthread_cond_signal(&ta->need_commits);
2646 		if (errcode)
2647 			return got_error_set_errno(errcode,
2648 			    "pthread_cond_signal");
2649 
2650 		/*
2651 		 * The mutex will be released while the view loop waits
2652 		 * in wgetch(), at which time the log thread will run.
2653 		 */
2654 		if (!wait)
2655 			break;
2656 
2657 		/* Display progress update in log view. */
2658 		show_log_view(view);
2659 		update_panels();
2660 		doupdate();
2661 
2662 		/* Wait right here while next commit is being loaded. */
2663 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2664 		if (errcode)
2665 			return got_error_set_errno(errcode,
2666 			    "pthread_cond_wait");
2667 
2668 		/* Display progress update in log view. */
2669 		show_log_view(view);
2670 		update_panels();
2671 		doupdate();
2672 	}
2673 
2674 	return NULL;
2675 }
2676 
2677 static const struct got_error *
2678 request_log_commits(struct tog_view *view)
2679 {
2680 	struct tog_log_view_state	*state = &view->state.log;
2681 	const struct got_error		*err = NULL;
2682 
2683 	if (state->thread_args.log_complete)
2684 		return NULL;
2685 
2686 	state->thread_args.commits_needed += view->nscrolled;
2687 	err = trigger_log_thread(view, 1);
2688 	view->nscrolled = 0;
2689 
2690 	return err;
2691 }
2692 
2693 static const struct got_error *
2694 log_scroll_down(struct tog_view *view, int maxscroll)
2695 {
2696 	struct tog_log_view_state *s = &view->state.log;
2697 	const struct got_error *err = NULL;
2698 	struct commit_queue_entry *pentry;
2699 	int nscrolled = 0, ncommits_needed;
2700 
2701 	if (s->last_displayed_entry == NULL)
2702 		return NULL;
2703 
2704 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2705 	if (s->commits->ncommits < ncommits_needed &&
2706 	    !s->thread_args.log_complete) {
2707 		/*
2708 		 * Ask the log thread for required amount of commits.
2709 		 */
2710 		s->thread_args.commits_needed +=
2711 		    ncommits_needed - s->commits->ncommits;
2712 		err = trigger_log_thread(view, 1);
2713 		if (err)
2714 			return err;
2715 	}
2716 
2717 	do {
2718 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2719 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2720 			break;
2721 
2722 		s->last_displayed_entry = pentry ?
2723 		    pentry : s->last_displayed_entry;
2724 
2725 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2726 		if (pentry == NULL)
2727 			break;
2728 		s->first_displayed_entry = pentry;
2729 	} while (++nscrolled < maxscroll);
2730 
2731 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2732 		view->nscrolled += nscrolled;
2733 	else
2734 		view->nscrolled = 0;
2735 
2736 	return err;
2737 }
2738 
2739 static const struct got_error *
2740 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2741     struct got_commit_object *commit, struct got_object_id *commit_id,
2742     struct tog_view *log_view, struct got_repository *repo)
2743 {
2744 	const struct got_error *err;
2745 	struct got_object_qid *parent_id;
2746 	struct tog_view *diff_view;
2747 
2748 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2749 	if (diff_view == NULL)
2750 		return got_error_from_errno("view_open");
2751 
2752 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2753 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2754 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2755 	if (err == NULL)
2756 		*new_view = diff_view;
2757 	return err;
2758 }
2759 
2760 static const struct got_error *
2761 tree_view_visit_subtree(struct tog_tree_view_state *s,
2762     struct got_tree_object *subtree)
2763 {
2764 	struct tog_parent_tree *parent;
2765 
2766 	parent = calloc(1, sizeof(*parent));
2767 	if (parent == NULL)
2768 		return got_error_from_errno("calloc");
2769 
2770 	parent->tree = s->tree;
2771 	parent->first_displayed_entry = s->first_displayed_entry;
2772 	parent->selected_entry = s->selected_entry;
2773 	parent->selected = s->selected;
2774 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2775 	s->tree = subtree;
2776 	s->selected = 0;
2777 	s->first_displayed_entry = NULL;
2778 	return NULL;
2779 }
2780 
2781 static const struct got_error *
2782 tree_view_walk_path(struct tog_tree_view_state *s,
2783     struct got_commit_object *commit, const char *path)
2784 {
2785 	const struct got_error *err = NULL;
2786 	struct got_tree_object *tree = NULL;
2787 	const char *p;
2788 	char *slash, *subpath = NULL;
2789 
2790 	/* Walk the path and open corresponding tree objects. */
2791 	p = path;
2792 	while (*p) {
2793 		struct got_tree_entry *te;
2794 		struct got_object_id *tree_id;
2795 		char *te_name;
2796 
2797 		while (p[0] == '/')
2798 			p++;
2799 
2800 		/* Ensure the correct subtree entry is selected. */
2801 		slash = strchr(p, '/');
2802 		if (slash == NULL)
2803 			te_name = strdup(p);
2804 		else
2805 			te_name = strndup(p, slash - p);
2806 		if (te_name == NULL) {
2807 			err = got_error_from_errno("strndup");
2808 			break;
2809 		}
2810 		te = got_object_tree_find_entry(s->tree, te_name);
2811 		if (te == NULL) {
2812 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2813 			free(te_name);
2814 			break;
2815 		}
2816 		free(te_name);
2817 		s->first_displayed_entry = s->selected_entry = te;
2818 
2819 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2820 			break; /* jump to this file's entry */
2821 
2822 		slash = strchr(p, '/');
2823 		if (slash)
2824 			subpath = strndup(path, slash - path);
2825 		else
2826 			subpath = strdup(path);
2827 		if (subpath == NULL) {
2828 			err = got_error_from_errno("strdup");
2829 			break;
2830 		}
2831 
2832 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2833 		    subpath);
2834 		if (err)
2835 			break;
2836 
2837 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2838 		free(tree_id);
2839 		if (err)
2840 			break;
2841 
2842 		err = tree_view_visit_subtree(s, tree);
2843 		if (err) {
2844 			got_object_tree_close(tree);
2845 			break;
2846 		}
2847 		if (slash == NULL)
2848 			break;
2849 		free(subpath);
2850 		subpath = NULL;
2851 		p = slash;
2852 	}
2853 
2854 	free(subpath);
2855 	return err;
2856 }
2857 
2858 static const struct got_error *
2859 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2860     struct commit_queue_entry *entry, const char *path,
2861     const char *head_ref_name, struct got_repository *repo)
2862 {
2863 	const struct got_error *err = NULL;
2864 	struct tog_tree_view_state *s;
2865 	struct tog_view *tree_view;
2866 
2867 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2868 	if (tree_view == NULL)
2869 		return got_error_from_errno("view_open");
2870 
2871 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2872 	if (err)
2873 		return err;
2874 	s = &tree_view->state.tree;
2875 
2876 	*new_view = tree_view;
2877 
2878 	if (got_path_is_root_dir(path))
2879 		return NULL;
2880 
2881 	return tree_view_walk_path(s, entry->commit, path);
2882 }
2883 
2884 static const struct got_error *
2885 block_signals_used_by_main_thread(void)
2886 {
2887 	sigset_t sigset;
2888 	int errcode;
2889 
2890 	if (sigemptyset(&sigset) == -1)
2891 		return got_error_from_errno("sigemptyset");
2892 
2893 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2894 	if (sigaddset(&sigset, SIGWINCH) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGCONT) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 	if (sigaddset(&sigset, SIGINT) == -1)
2899 		return got_error_from_errno("sigaddset");
2900 	if (sigaddset(&sigset, SIGTERM) == -1)
2901 		return got_error_from_errno("sigaddset");
2902 
2903 	/* ncurses handles SIGTSTP */
2904 	if (sigaddset(&sigset, SIGTSTP) == -1)
2905 		return got_error_from_errno("sigaddset");
2906 
2907 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2908 	if (errcode)
2909 		return got_error_set_errno(errcode, "pthread_sigmask");
2910 
2911 	return NULL;
2912 }
2913 
2914 static void *
2915 log_thread(void *arg)
2916 {
2917 	const struct got_error *err = NULL;
2918 	int errcode = 0;
2919 	struct tog_log_thread_args *a = arg;
2920 	int done = 0;
2921 
2922 	/*
2923 	 * Sync startup with main thread such that we begin our
2924 	 * work once view_input() has released the mutex.
2925 	 */
2926 	errcode = pthread_mutex_lock(&tog_mutex);
2927 	if (errcode) {
2928 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2929 		return (void *)err;
2930 	}
2931 
2932 	err = block_signals_used_by_main_thread();
2933 	if (err) {
2934 		pthread_mutex_unlock(&tog_mutex);
2935 		goto done;
2936 	}
2937 
2938 	while (!done && !err && !tog_fatal_signal_received()) {
2939 		errcode = pthread_mutex_unlock(&tog_mutex);
2940 		if (errcode) {
2941 			err = got_error_set_errno(errcode,
2942 			    "pthread_mutex_unlock");
2943 			goto done;
2944 		}
2945 		err = queue_commits(a);
2946 		if (err) {
2947 			if (err->code != GOT_ERR_ITER_COMPLETED)
2948 				goto done;
2949 			err = NULL;
2950 			done = 1;
2951 		} else if (a->commits_needed > 0 && !a->load_all) {
2952 			if (*a->limiting) {
2953 				if (a->limit_match)
2954 					a->commits_needed--;
2955 			} else
2956 				a->commits_needed--;
2957 		}
2958 
2959 		errcode = pthread_mutex_lock(&tog_mutex);
2960 		if (errcode) {
2961 			err = got_error_set_errno(errcode,
2962 			    "pthread_mutex_lock");
2963 			goto done;
2964 		} else if (*a->quit)
2965 			done = 1;
2966 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2967 			*a->first_displayed_entry =
2968 			    TAILQ_FIRST(&a->limit_commits->head);
2969 			*a->selected_entry = *a->first_displayed_entry;
2970 		} else if (*a->first_displayed_entry == NULL) {
2971 			*a->first_displayed_entry =
2972 			    TAILQ_FIRST(&a->real_commits->head);
2973 			*a->selected_entry = *a->first_displayed_entry;
2974 		}
2975 
2976 		errcode = pthread_cond_signal(&a->commit_loaded);
2977 		if (errcode) {
2978 			err = got_error_set_errno(errcode,
2979 			    "pthread_cond_signal");
2980 			pthread_mutex_unlock(&tog_mutex);
2981 			goto done;
2982 		}
2983 
2984 		if (done)
2985 			a->commits_needed = 0;
2986 		else {
2987 			if (a->commits_needed == 0 && !a->load_all) {
2988 				errcode = pthread_cond_wait(&a->need_commits,
2989 				    &tog_mutex);
2990 				if (errcode) {
2991 					err = got_error_set_errno(errcode,
2992 					    "pthread_cond_wait");
2993 					pthread_mutex_unlock(&tog_mutex);
2994 					goto done;
2995 				}
2996 				if (*a->quit)
2997 					done = 1;
2998 			}
2999 		}
3000 	}
3001 	a->log_complete = 1;
3002 	errcode = pthread_mutex_unlock(&tog_mutex);
3003 	if (errcode)
3004 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3005 done:
3006 	if (err) {
3007 		tog_thread_error = 1;
3008 		pthread_cond_signal(&a->commit_loaded);
3009 	}
3010 	return (void *)err;
3011 }
3012 
3013 static const struct got_error *
3014 stop_log_thread(struct tog_log_view_state *s)
3015 {
3016 	const struct got_error *err = NULL, *thread_err = NULL;
3017 	int errcode;
3018 
3019 	if (s->thread) {
3020 		s->quit = 1;
3021 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3022 		if (errcode)
3023 			return got_error_set_errno(errcode,
3024 			    "pthread_cond_signal");
3025 		errcode = pthread_mutex_unlock(&tog_mutex);
3026 		if (errcode)
3027 			return got_error_set_errno(errcode,
3028 			    "pthread_mutex_unlock");
3029 		errcode = pthread_join(s->thread, (void **)&thread_err);
3030 		if (errcode)
3031 			return got_error_set_errno(errcode, "pthread_join");
3032 		errcode = pthread_mutex_lock(&tog_mutex);
3033 		if (errcode)
3034 			return got_error_set_errno(errcode,
3035 			    "pthread_mutex_lock");
3036 		s->thread = NULL;
3037 	}
3038 
3039 	if (s->thread_args.repo) {
3040 		err = got_repo_close(s->thread_args.repo);
3041 		s->thread_args.repo = NULL;
3042 	}
3043 
3044 	if (s->thread_args.pack_fds) {
3045 		const struct got_error *pack_err =
3046 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3047 		if (err == NULL)
3048 			err = pack_err;
3049 		s->thread_args.pack_fds = NULL;
3050 	}
3051 
3052 	if (s->thread_args.graph) {
3053 		got_commit_graph_close(s->thread_args.graph);
3054 		s->thread_args.graph = NULL;
3055 	}
3056 
3057 	return err ? err : thread_err;
3058 }
3059 
3060 static const struct got_error *
3061 close_log_view(struct tog_view *view)
3062 {
3063 	const struct got_error *err = NULL;
3064 	struct tog_log_view_state *s = &view->state.log;
3065 	int errcode;
3066 
3067 	err = stop_log_thread(s);
3068 
3069 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3070 	if (errcode && err == NULL)
3071 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3072 
3073 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3074 	if (errcode && err == NULL)
3075 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3076 
3077 	free_commits(&s->limit_commits);
3078 	free_commits(&s->real_commits);
3079 	free(s->in_repo_path);
3080 	s->in_repo_path = NULL;
3081 	free(s->start_id);
3082 	s->start_id = NULL;
3083 	free(s->head_ref_name);
3084 	s->head_ref_name = NULL;
3085 	return err;
3086 }
3087 
3088 /*
3089  * We use two queues to implement the limit feature: first consists of
3090  * commits matching the current limit_regex; second is the real queue
3091  * of all known commits (real_commits). When the user starts limiting,
3092  * we swap queues such that all movement and displaying functionality
3093  * works with very slight change.
3094  */
3095 static const struct got_error *
3096 limit_log_view(struct tog_view *view)
3097 {
3098 	struct tog_log_view_state *s = &view->state.log;
3099 	struct commit_queue_entry *entry;
3100 	struct tog_view	*v = view;
3101 	const struct got_error *err = NULL;
3102 	char pattern[1024];
3103 	int ret;
3104 
3105 	if (view_is_hsplit_top(view))
3106 		v = view->child;
3107 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3108 		v = view->parent;
3109 
3110 	/* Get the pattern */
3111 	wmove(v->window, v->nlines - 1, 0);
3112 	wclrtoeol(v->window);
3113 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3114 	nodelay(v->window, FALSE);
3115 	nocbreak();
3116 	echo();
3117 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3118 	cbreak();
3119 	noecho();
3120 	nodelay(v->window, TRUE);
3121 	if (ret == ERR)
3122 		return NULL;
3123 
3124 	if (*pattern == '\0') {
3125 		/*
3126 		 * Safety measure for the situation where the user
3127 		 * resets limit without previously limiting anything.
3128 		 */
3129 		if (!s->limit_view)
3130 			return NULL;
3131 
3132 		/*
3133 		 * User could have pressed Ctrl+L, which refreshed the
3134 		 * commit queues, it means we can't save previously
3135 		 * (before limit took place) displayed entries,
3136 		 * because they would point to already free'ed memory,
3137 		 * so we are forced to always select first entry of
3138 		 * the queue.
3139 		 */
3140 		s->commits = &s->real_commits;
3141 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3142 		s->selected_entry = s->first_displayed_entry;
3143 		s->selected = 0;
3144 		s->limit_view = 0;
3145 
3146 		return NULL;
3147 	}
3148 
3149 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3150 		return NULL;
3151 
3152 	s->limit_view = 1;
3153 
3154 	/* Clear the screen while loading limit view */
3155 	s->first_displayed_entry = NULL;
3156 	s->last_displayed_entry = NULL;
3157 	s->selected_entry = NULL;
3158 	s->commits = &s->limit_commits;
3159 
3160 	/* Prepare limit queue for new search */
3161 	free_commits(&s->limit_commits);
3162 	s->limit_commits.ncommits = 0;
3163 
3164 	/* First process commits, which are in queue already */
3165 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3166 		int have_match = 0;
3167 
3168 		err = match_commit(&have_match, entry->id,
3169 		    entry->commit, &s->limit_regex);
3170 		if (err)
3171 			return err;
3172 
3173 		if (have_match) {
3174 			struct commit_queue_entry *matched;
3175 
3176 			matched = alloc_commit_queue_entry(entry->commit,
3177 			    entry->id);
3178 			if (matched == NULL) {
3179 				err = got_error_from_errno(
3180 				    "alloc_commit_queue_entry");
3181 				break;
3182 			}
3183 			matched->commit = entry->commit;
3184 			got_object_commit_retain(entry->commit);
3185 
3186 			matched->idx = s->limit_commits.ncommits;
3187 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3188 			    matched, entry);
3189 			s->limit_commits.ncommits++;
3190 		}
3191 	}
3192 
3193 	/* Second process all the commits, until we fill the screen */
3194 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3195 	    !s->thread_args.log_complete) {
3196 		s->thread_args.commits_needed +=
3197 		    view->nlines - s->limit_commits.ncommits - 1;
3198 		err = trigger_log_thread(view, 1);
3199 		if (err)
3200 			return err;
3201 	}
3202 
3203 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3204 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3205 	s->selected = 0;
3206 
3207 	return NULL;
3208 }
3209 
3210 static const struct got_error *
3211 search_start_log_view(struct tog_view *view)
3212 {
3213 	struct tog_log_view_state *s = &view->state.log;
3214 
3215 	s->matched_entry = NULL;
3216 	s->search_entry = NULL;
3217 	return NULL;
3218 }
3219 
3220 static const struct got_error *
3221 search_next_log_view(struct tog_view *view)
3222 {
3223 	const struct got_error *err = NULL;
3224 	struct tog_log_view_state *s = &view->state.log;
3225 	struct commit_queue_entry *entry;
3226 
3227 	/* Display progress update in log view. */
3228 	show_log_view(view);
3229 	update_panels();
3230 	doupdate();
3231 
3232 	if (s->search_entry) {
3233 		int errcode, ch;
3234 		errcode = pthread_mutex_unlock(&tog_mutex);
3235 		if (errcode)
3236 			return got_error_set_errno(errcode,
3237 			    "pthread_mutex_unlock");
3238 		ch = wgetch(view->window);
3239 		errcode = pthread_mutex_lock(&tog_mutex);
3240 		if (errcode)
3241 			return got_error_set_errno(errcode,
3242 			    "pthread_mutex_lock");
3243 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3244 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3245 			return NULL;
3246 		}
3247 		if (view->searching == TOG_SEARCH_FORWARD)
3248 			entry = TAILQ_NEXT(s->search_entry, entry);
3249 		else
3250 			entry = TAILQ_PREV(s->search_entry,
3251 			    commit_queue_head, entry);
3252 	} else if (s->matched_entry) {
3253 		/*
3254 		 * If the user has moved the cursor after we hit a match,
3255 		 * the position from where we should continue searching
3256 		 * might have changed.
3257 		 */
3258 		if (view->searching == TOG_SEARCH_FORWARD)
3259 			entry = TAILQ_NEXT(s->selected_entry, entry);
3260 		else
3261 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3262 			    entry);
3263 	} else {
3264 		entry = s->selected_entry;
3265 	}
3266 
3267 	while (1) {
3268 		int have_match = 0;
3269 
3270 		if (entry == NULL) {
3271 			if (s->thread_args.log_complete ||
3272 			    view->searching == TOG_SEARCH_BACKWARD) {
3273 				view->search_next_done =
3274 				    (s->matched_entry == NULL ?
3275 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3276 				s->search_entry = NULL;
3277 				return NULL;
3278 			}
3279 			/*
3280 			 * Poke the log thread for more commits and return,
3281 			 * allowing the main loop to make progress. Search
3282 			 * will resume at s->search_entry once we come back.
3283 			 */
3284 			s->thread_args.commits_needed++;
3285 			return trigger_log_thread(view, 0);
3286 		}
3287 
3288 		err = match_commit(&have_match, entry->id, entry->commit,
3289 		    &view->regex);
3290 		if (err)
3291 			break;
3292 		if (have_match) {
3293 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3294 			s->matched_entry = entry;
3295 			break;
3296 		}
3297 
3298 		s->search_entry = entry;
3299 		if (view->searching == TOG_SEARCH_FORWARD)
3300 			entry = TAILQ_NEXT(entry, entry);
3301 		else
3302 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3303 	}
3304 
3305 	if (s->matched_entry) {
3306 		int cur = s->selected_entry->idx;
3307 		while (cur < s->matched_entry->idx) {
3308 			err = input_log_view(NULL, view, KEY_DOWN);
3309 			if (err)
3310 				return err;
3311 			cur++;
3312 		}
3313 		while (cur > s->matched_entry->idx) {
3314 			err = input_log_view(NULL, view, KEY_UP);
3315 			if (err)
3316 				return err;
3317 			cur--;
3318 		}
3319 	}
3320 
3321 	s->search_entry = NULL;
3322 
3323 	return NULL;
3324 }
3325 
3326 static const struct got_error *
3327 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3328     struct got_repository *repo, const char *head_ref_name,
3329     const char *in_repo_path, int log_branches)
3330 {
3331 	const struct got_error *err = NULL;
3332 	struct tog_log_view_state *s = &view->state.log;
3333 	struct got_repository *thread_repo = NULL;
3334 	struct got_commit_graph *thread_graph = NULL;
3335 	int errcode;
3336 
3337 	if (in_repo_path != s->in_repo_path) {
3338 		free(s->in_repo_path);
3339 		s->in_repo_path = strdup(in_repo_path);
3340 		if (s->in_repo_path == NULL)
3341 			return got_error_from_errno("strdup");
3342 	}
3343 
3344 	/* The commit queue only contains commits being displayed. */
3345 	TAILQ_INIT(&s->real_commits.head);
3346 	s->real_commits.ncommits = 0;
3347 	s->commits = &s->real_commits;
3348 
3349 	TAILQ_INIT(&s->limit_commits.head);
3350 	s->limit_view = 0;
3351 	s->limit_commits.ncommits = 0;
3352 
3353 	s->repo = repo;
3354 	if (head_ref_name) {
3355 		s->head_ref_name = strdup(head_ref_name);
3356 		if (s->head_ref_name == NULL) {
3357 			err = got_error_from_errno("strdup");
3358 			goto done;
3359 		}
3360 	}
3361 	s->start_id = got_object_id_dup(start_id);
3362 	if (s->start_id == NULL) {
3363 		err = got_error_from_errno("got_object_id_dup");
3364 		goto done;
3365 	}
3366 	s->log_branches = log_branches;
3367 	s->use_committer = 1;
3368 
3369 	STAILQ_INIT(&s->colors);
3370 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3371 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3372 		    get_color_value("TOG_COLOR_COMMIT"));
3373 		if (err)
3374 			goto done;
3375 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3376 		    get_color_value("TOG_COLOR_AUTHOR"));
3377 		if (err) {
3378 			free_colors(&s->colors);
3379 			goto done;
3380 		}
3381 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3382 		    get_color_value("TOG_COLOR_DATE"));
3383 		if (err) {
3384 			free_colors(&s->colors);
3385 			goto done;
3386 		}
3387 	}
3388 
3389 	view->show = show_log_view;
3390 	view->input = input_log_view;
3391 	view->resize = resize_log_view;
3392 	view->close = close_log_view;
3393 	view->search_start = search_start_log_view;
3394 	view->search_next = search_next_log_view;
3395 
3396 	if (s->thread_args.pack_fds == NULL) {
3397 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3398 		if (err)
3399 			goto done;
3400 	}
3401 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3402 	    s->thread_args.pack_fds);
3403 	if (err)
3404 		goto done;
3405 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3406 	    !s->log_branches);
3407 	if (err)
3408 		goto done;
3409 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3410 	    s->repo, NULL, NULL);
3411 	if (err)
3412 		goto done;
3413 
3414 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3415 	if (errcode) {
3416 		err = got_error_set_errno(errcode, "pthread_cond_init");
3417 		goto done;
3418 	}
3419 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3420 	if (errcode) {
3421 		err = got_error_set_errno(errcode, "pthread_cond_init");
3422 		goto done;
3423 	}
3424 
3425 	s->thread_args.commits_needed = view->nlines;
3426 	s->thread_args.graph = thread_graph;
3427 	s->thread_args.real_commits = &s->real_commits;
3428 	s->thread_args.limit_commits = &s->limit_commits;
3429 	s->thread_args.in_repo_path = s->in_repo_path;
3430 	s->thread_args.start_id = s->start_id;
3431 	s->thread_args.repo = thread_repo;
3432 	s->thread_args.log_complete = 0;
3433 	s->thread_args.quit = &s->quit;
3434 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3435 	s->thread_args.selected_entry = &s->selected_entry;
3436 	s->thread_args.searching = &view->searching;
3437 	s->thread_args.search_next_done = &view->search_next_done;
3438 	s->thread_args.regex = &view->regex;
3439 	s->thread_args.limiting = &s->limit_view;
3440 	s->thread_args.limit_regex = &s->limit_regex;
3441 	s->thread_args.limit_commits = &s->limit_commits;
3442 done:
3443 	if (err)
3444 		close_log_view(view);
3445 	return err;
3446 }
3447 
3448 static const struct got_error *
3449 show_log_view(struct tog_view *view)
3450 {
3451 	const struct got_error *err;
3452 	struct tog_log_view_state *s = &view->state.log;
3453 
3454 	if (s->thread == NULL) {
3455 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3456 		    &s->thread_args);
3457 		if (errcode)
3458 			return got_error_set_errno(errcode, "pthread_create");
3459 		if (s->thread_args.commits_needed > 0) {
3460 			err = trigger_log_thread(view, 1);
3461 			if (err)
3462 				return err;
3463 		}
3464 	}
3465 
3466 	return draw_commits(view);
3467 }
3468 
3469 static void
3470 log_move_cursor_up(struct tog_view *view, int page, int home)
3471 {
3472 	struct tog_log_view_state *s = &view->state.log;
3473 
3474 	if (s->first_displayed_entry == NULL)
3475 		return;
3476 	if (s->selected_entry->idx == 0)
3477 		view->count = 0;
3478 
3479 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3480 	    || home)
3481 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3482 
3483 	if (!page && !home && s->selected > 0)
3484 		--s->selected;
3485 	else
3486 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3487 
3488 	select_commit(s);
3489 	return;
3490 }
3491 
3492 static const struct got_error *
3493 log_move_cursor_down(struct tog_view *view, int page)
3494 {
3495 	struct tog_log_view_state	*s = &view->state.log;
3496 	const struct got_error		*err = NULL;
3497 	int				 eos = view->nlines - 2;
3498 
3499 	if (s->first_displayed_entry == NULL)
3500 		return NULL;
3501 
3502 	if (s->thread_args.log_complete &&
3503 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3504 		return NULL;
3505 
3506 	if (view_is_hsplit_top(view))
3507 		--eos;  /* border consumes the last line */
3508 
3509 	if (!page) {
3510 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3511 			++s->selected;
3512 		else
3513 			err = log_scroll_down(view, 1);
3514 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3515 		struct commit_queue_entry *entry;
3516 		int n;
3517 
3518 		s->selected = 0;
3519 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3520 		s->last_displayed_entry = entry;
3521 		for (n = 0; n <= eos; n++) {
3522 			if (entry == NULL)
3523 				break;
3524 			s->first_displayed_entry = entry;
3525 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3526 		}
3527 		if (n > 0)
3528 			s->selected = n - 1;
3529 	} else {
3530 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3531 		    s->thread_args.log_complete)
3532 			s->selected += MIN(page,
3533 			    s->commits->ncommits - s->selected_entry->idx - 1);
3534 		else
3535 			err = log_scroll_down(view, page);
3536 	}
3537 	if (err)
3538 		return err;
3539 
3540 	/*
3541 	 * We might necessarily overshoot in horizontal
3542 	 * splits; if so, select the last displayed commit.
3543 	 */
3544 	if (s->first_displayed_entry && s->last_displayed_entry) {
3545 		s->selected = MIN(s->selected,
3546 		    s->last_displayed_entry->idx -
3547 		    s->first_displayed_entry->idx);
3548 	}
3549 
3550 	select_commit(s);
3551 
3552 	if (s->thread_args.log_complete &&
3553 	    s->selected_entry->idx == s->commits->ncommits - 1)
3554 		view->count = 0;
3555 
3556 	return NULL;
3557 }
3558 
3559 static void
3560 view_get_split(struct tog_view *view, int *y, int *x)
3561 {
3562 	*x = 0;
3563 	*y = 0;
3564 
3565 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3566 		if (view->child && view->child->resized_y)
3567 			*y = view->child->resized_y;
3568 		else if (view->resized_y)
3569 			*y = view->resized_y;
3570 		else
3571 			*y = view_split_begin_y(view->lines);
3572 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3573 		if (view->child && view->child->resized_x)
3574 			*x = view->child->resized_x;
3575 		else if (view->resized_x)
3576 			*x = view->resized_x;
3577 		else
3578 			*x = view_split_begin_x(view->begin_x);
3579 	}
3580 }
3581 
3582 /* Split view horizontally at y and offset view->state->selected line. */
3583 static const struct got_error *
3584 view_init_hsplit(struct tog_view *view, int y)
3585 {
3586 	const struct got_error *err = NULL;
3587 
3588 	view->nlines = y;
3589 	view->ncols = COLS;
3590 	err = view_resize(view);
3591 	if (err)
3592 		return err;
3593 
3594 	err = offset_selection_down(view);
3595 
3596 	return err;
3597 }
3598 
3599 static const struct got_error *
3600 log_goto_line(struct tog_view *view, int nlines)
3601 {
3602 	const struct got_error		*err = NULL;
3603 	struct tog_log_view_state	*s = &view->state.log;
3604 	int				 g, idx = s->selected_entry->idx;
3605 
3606 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3607 		return NULL;
3608 
3609 	g = view->gline;
3610 	view->gline = 0;
3611 
3612 	if (g >= s->first_displayed_entry->idx + 1 &&
3613 	    g <= s->last_displayed_entry->idx + 1 &&
3614 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3615 		s->selected = g - s->first_displayed_entry->idx - 1;
3616 		select_commit(s);
3617 		return NULL;
3618 	}
3619 
3620 	if (idx + 1 < g) {
3621 		err = log_move_cursor_down(view, g - idx - 1);
3622 		if (!err && g > s->selected_entry->idx + 1)
3623 			err = log_move_cursor_down(view,
3624 			    g - s->first_displayed_entry->idx - 1);
3625 		if (err)
3626 			return err;
3627 	} else if (idx + 1 > g)
3628 		log_move_cursor_up(view, idx - g + 1, 0);
3629 
3630 	if (g < nlines && s->first_displayed_entry->idx == 0)
3631 		s->selected = g - 1;
3632 
3633 	select_commit(s);
3634 	return NULL;
3635 
3636 }
3637 
3638 static const struct got_error *
3639 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3640 {
3641 	const struct got_error *err = NULL;
3642 	struct tog_log_view_state *s = &view->state.log;
3643 	int eos, nscroll;
3644 
3645 	if (s->thread_args.load_all) {
3646 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3647 			s->thread_args.load_all = 0;
3648 		else if (s->thread_args.log_complete) {
3649 			err = log_move_cursor_down(view, s->commits->ncommits);
3650 			s->thread_args.load_all = 0;
3651 		}
3652 		if (err)
3653 			return err;
3654 	}
3655 
3656 	eos = nscroll = view->nlines - 1;
3657 	if (view_is_hsplit_top(view))
3658 		--eos;  /* border */
3659 
3660 	if (view->gline)
3661 		return log_goto_line(view, eos);
3662 
3663 	switch (ch) {
3664 	case '&':
3665 		err = limit_log_view(view);
3666 		break;
3667 	case 'q':
3668 		s->quit = 1;
3669 		break;
3670 	case '0':
3671 		view->x = 0;
3672 		break;
3673 	case '$':
3674 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3675 		view->count = 0;
3676 		break;
3677 	case KEY_RIGHT:
3678 	case 'l':
3679 		if (view->x + view->ncols / 2 < view->maxx)
3680 			view->x += 2;  /* move two columns right */
3681 		else
3682 			view->count = 0;
3683 		break;
3684 	case KEY_LEFT:
3685 	case 'h':
3686 		view->x -= MIN(view->x, 2);  /* move two columns back */
3687 		if (view->x <= 0)
3688 			view->count = 0;
3689 		break;
3690 	case 'k':
3691 	case KEY_UP:
3692 	case '<':
3693 	case ',':
3694 	case CTRL('p'):
3695 		log_move_cursor_up(view, 0, 0);
3696 		break;
3697 	case 'g':
3698 	case '=':
3699 	case KEY_HOME:
3700 		log_move_cursor_up(view, 0, 1);
3701 		view->count = 0;
3702 		break;
3703 	case CTRL('u'):
3704 	case 'u':
3705 		nscroll /= 2;
3706 		/* FALL THROUGH */
3707 	case KEY_PPAGE:
3708 	case CTRL('b'):
3709 	case 'b':
3710 		log_move_cursor_up(view, nscroll, 0);
3711 		break;
3712 	case 'j':
3713 	case KEY_DOWN:
3714 	case '>':
3715 	case '.':
3716 	case CTRL('n'):
3717 		err = log_move_cursor_down(view, 0);
3718 		break;
3719 	case '@':
3720 		s->use_committer = !s->use_committer;
3721 		break;
3722 	case 'G':
3723 	case '*':
3724 	case KEY_END: {
3725 		/* We don't know yet how many commits, so we're forced to
3726 		 * traverse them all. */
3727 		view->count = 0;
3728 		s->thread_args.load_all = 1;
3729 		if (!s->thread_args.log_complete)
3730 			return trigger_log_thread(view, 0);
3731 		err = log_move_cursor_down(view, s->commits->ncommits);
3732 		s->thread_args.load_all = 0;
3733 		break;
3734 	}
3735 	case CTRL('d'):
3736 	case 'd':
3737 		nscroll /= 2;
3738 		/* FALL THROUGH */
3739 	case KEY_NPAGE:
3740 	case CTRL('f'):
3741 	case 'f':
3742 	case ' ':
3743 		err = log_move_cursor_down(view, nscroll);
3744 		break;
3745 	case KEY_RESIZE:
3746 		if (s->selected > view->nlines - 2)
3747 			s->selected = view->nlines - 2;
3748 		if (s->selected > s->commits->ncommits - 1)
3749 			s->selected = s->commits->ncommits - 1;
3750 		select_commit(s);
3751 		if (s->commits->ncommits < view->nlines - 1 &&
3752 		    !s->thread_args.log_complete) {
3753 			s->thread_args.commits_needed += (view->nlines - 1) -
3754 			    s->commits->ncommits;
3755 			err = trigger_log_thread(view, 1);
3756 		}
3757 		break;
3758 	case KEY_ENTER:
3759 	case '\r':
3760 		view->count = 0;
3761 		if (s->selected_entry == NULL)
3762 			break;
3763 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3764 		break;
3765 	case 'T':
3766 		view->count = 0;
3767 		if (s->selected_entry == NULL)
3768 			break;
3769 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3770 		break;
3771 	case KEY_BACKSPACE:
3772 	case CTRL('l'):
3773 	case 'B':
3774 		view->count = 0;
3775 		if (ch == KEY_BACKSPACE &&
3776 		    got_path_is_root_dir(s->in_repo_path))
3777 			break;
3778 		err = stop_log_thread(s);
3779 		if (err)
3780 			return err;
3781 		if (ch == KEY_BACKSPACE) {
3782 			char *parent_path;
3783 			err = got_path_dirname(&parent_path, s->in_repo_path);
3784 			if (err)
3785 				return err;
3786 			free(s->in_repo_path);
3787 			s->in_repo_path = parent_path;
3788 			s->thread_args.in_repo_path = s->in_repo_path;
3789 		} else if (ch == CTRL('l')) {
3790 			struct got_object_id *start_id;
3791 			err = got_repo_match_object_id(&start_id, NULL,
3792 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3793 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3794 			if (err) {
3795 				if (s->head_ref_name == NULL ||
3796 				    err->code != GOT_ERR_NOT_REF)
3797 					return err;
3798 				/* Try to cope with deleted references. */
3799 				free(s->head_ref_name);
3800 				s->head_ref_name = NULL;
3801 				err = got_repo_match_object_id(&start_id,
3802 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3803 				    &tog_refs, s->repo);
3804 				if (err)
3805 					return err;
3806 			}
3807 			free(s->start_id);
3808 			s->start_id = start_id;
3809 			s->thread_args.start_id = s->start_id;
3810 		} else /* 'B' */
3811 			s->log_branches = !s->log_branches;
3812 
3813 		if (s->thread_args.pack_fds == NULL) {
3814 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3815 			if (err)
3816 				return err;
3817 		}
3818 		err = got_repo_open(&s->thread_args.repo,
3819 		    got_repo_get_path(s->repo), NULL,
3820 		    s->thread_args.pack_fds);
3821 		if (err)
3822 			return err;
3823 		tog_free_refs();
3824 		err = tog_load_refs(s->repo, 0);
3825 		if (err)
3826 			return err;
3827 		err = got_commit_graph_open(&s->thread_args.graph,
3828 		    s->in_repo_path, !s->log_branches);
3829 		if (err)
3830 			return err;
3831 		err = got_commit_graph_iter_start(s->thread_args.graph,
3832 		    s->start_id, s->repo, NULL, NULL);
3833 		if (err)
3834 			return err;
3835 		free_commits(&s->real_commits);
3836 		free_commits(&s->limit_commits);
3837 		s->first_displayed_entry = NULL;
3838 		s->last_displayed_entry = NULL;
3839 		s->selected_entry = NULL;
3840 		s->selected = 0;
3841 		s->thread_args.log_complete = 0;
3842 		s->quit = 0;
3843 		s->thread_args.commits_needed = view->lines;
3844 		s->matched_entry = NULL;
3845 		s->search_entry = NULL;
3846 		view->offset = 0;
3847 		break;
3848 	case 'R':
3849 		view->count = 0;
3850 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3851 		break;
3852 	default:
3853 		view->count = 0;
3854 		break;
3855 	}
3856 
3857 	return err;
3858 }
3859 
3860 static const struct got_error *
3861 apply_unveil(const char *repo_path, const char *worktree_path)
3862 {
3863 	const struct got_error *error;
3864 
3865 #ifdef PROFILE
3866 	if (unveil("gmon.out", "rwc") != 0)
3867 		return got_error_from_errno2("unveil", "gmon.out");
3868 #endif
3869 	if (repo_path && unveil(repo_path, "r") != 0)
3870 		return got_error_from_errno2("unveil", repo_path);
3871 
3872 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3873 		return got_error_from_errno2("unveil", worktree_path);
3874 
3875 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3876 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3877 
3878 	error = got_privsep_unveil_exec_helpers();
3879 	if (error != NULL)
3880 		return error;
3881 
3882 	if (unveil(NULL, NULL) != 0)
3883 		return got_error_from_errno("unveil");
3884 
3885 	return NULL;
3886 }
3887 
3888 static void
3889 init_curses(void)
3890 {
3891 	/*
3892 	 * Override default signal handlers before starting ncurses.
3893 	 * This should prevent ncurses from installing its own
3894 	 * broken cleanup() signal handler.
3895 	 */
3896 	signal(SIGWINCH, tog_sigwinch);
3897 	signal(SIGPIPE, tog_sigpipe);
3898 	signal(SIGCONT, tog_sigcont);
3899 	signal(SIGINT, tog_sigint);
3900 	signal(SIGTERM, tog_sigterm);
3901 
3902 	initscr();
3903 	cbreak();
3904 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3905 	noecho();
3906 	nonl();
3907 	intrflush(stdscr, FALSE);
3908 	keypad(stdscr, TRUE);
3909 	curs_set(0);
3910 	if (getenv("TOG_COLORS") != NULL) {
3911 		start_color();
3912 		use_default_colors();
3913 	}
3914 }
3915 
3916 static const struct got_error *
3917 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3918     struct got_repository *repo, struct got_worktree *worktree)
3919 {
3920 	const struct got_error *err = NULL;
3921 
3922 	if (argc == 0) {
3923 		*in_repo_path = strdup("/");
3924 		if (*in_repo_path == NULL)
3925 			return got_error_from_errno("strdup");
3926 		return NULL;
3927 	}
3928 
3929 	if (worktree) {
3930 		const char *prefix = got_worktree_get_path_prefix(worktree);
3931 		char *p;
3932 
3933 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3934 		if (err)
3935 			return err;
3936 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3937 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3938 		    p) == -1) {
3939 			err = got_error_from_errno("asprintf");
3940 			*in_repo_path = NULL;
3941 		}
3942 		free(p);
3943 	} else
3944 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3945 
3946 	return err;
3947 }
3948 
3949 static const struct got_error *
3950 cmd_log(int argc, char *argv[])
3951 {
3952 	const struct got_error *error;
3953 	struct got_repository *repo = NULL;
3954 	struct got_worktree *worktree = NULL;
3955 	struct got_object_id *start_id = NULL;
3956 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3957 	char *start_commit = NULL, *label = NULL;
3958 	struct got_reference *ref = NULL;
3959 	const char *head_ref_name = NULL;
3960 	int ch, log_branches = 0;
3961 	struct tog_view *view;
3962 	int *pack_fds = NULL;
3963 
3964 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3965 		switch (ch) {
3966 		case 'b':
3967 			log_branches = 1;
3968 			break;
3969 		case 'c':
3970 			start_commit = optarg;
3971 			break;
3972 		case 'r':
3973 			repo_path = realpath(optarg, NULL);
3974 			if (repo_path == NULL)
3975 				return got_error_from_errno2("realpath",
3976 				    optarg);
3977 			break;
3978 		default:
3979 			usage_log();
3980 			/* NOTREACHED */
3981 		}
3982 	}
3983 
3984 	argc -= optind;
3985 	argv += optind;
3986 
3987 	if (argc > 1)
3988 		usage_log();
3989 
3990 	error = got_repo_pack_fds_open(&pack_fds);
3991 	if (error != NULL)
3992 		goto done;
3993 
3994 	if (repo_path == NULL) {
3995 		cwd = getcwd(NULL, 0);
3996 		if (cwd == NULL)
3997 			return got_error_from_errno("getcwd");
3998 		error = got_worktree_open(&worktree, cwd);
3999 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4000 			goto done;
4001 		if (worktree)
4002 			repo_path =
4003 			    strdup(got_worktree_get_repo_path(worktree));
4004 		else
4005 			repo_path = strdup(cwd);
4006 		if (repo_path == NULL) {
4007 			error = got_error_from_errno("strdup");
4008 			goto done;
4009 		}
4010 	}
4011 
4012 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4013 	if (error != NULL)
4014 		goto done;
4015 
4016 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4017 	    repo, worktree);
4018 	if (error)
4019 		goto done;
4020 
4021 	init_curses();
4022 
4023 	error = apply_unveil(got_repo_get_path(repo),
4024 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4025 	if (error)
4026 		goto done;
4027 
4028 	/* already loaded by tog_log_with_path()? */
4029 	if (TAILQ_EMPTY(&tog_refs)) {
4030 		error = tog_load_refs(repo, 0);
4031 		if (error)
4032 			goto done;
4033 	}
4034 
4035 	if (start_commit == NULL) {
4036 		error = got_repo_match_object_id(&start_id, &label,
4037 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4038 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4039 		if (error)
4040 			goto done;
4041 		head_ref_name = label;
4042 	} else {
4043 		error = got_ref_open(&ref, repo, start_commit, 0);
4044 		if (error == NULL)
4045 			head_ref_name = got_ref_get_name(ref);
4046 		else if (error->code != GOT_ERR_NOT_REF)
4047 			goto done;
4048 		error = got_repo_match_object_id(&start_id, NULL,
4049 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4050 		if (error)
4051 			goto done;
4052 	}
4053 
4054 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4055 	if (view == NULL) {
4056 		error = got_error_from_errno("view_open");
4057 		goto done;
4058 	}
4059 	error = open_log_view(view, start_id, repo, head_ref_name,
4060 	    in_repo_path, log_branches);
4061 	if (error)
4062 		goto done;
4063 	if (worktree) {
4064 		/* Release work tree lock. */
4065 		got_worktree_close(worktree);
4066 		worktree = NULL;
4067 	}
4068 	error = view_loop(view);
4069 done:
4070 	free(in_repo_path);
4071 	free(repo_path);
4072 	free(cwd);
4073 	free(start_id);
4074 	free(label);
4075 	if (ref)
4076 		got_ref_close(ref);
4077 	if (repo) {
4078 		const struct got_error *close_err = got_repo_close(repo);
4079 		if (error == NULL)
4080 			error = close_err;
4081 	}
4082 	if (worktree)
4083 		got_worktree_close(worktree);
4084 	if (pack_fds) {
4085 		const struct got_error *pack_err =
4086 		    got_repo_pack_fds_close(pack_fds);
4087 		if (error == NULL)
4088 			error = pack_err;
4089 	}
4090 	tog_free_refs();
4091 	return error;
4092 }
4093 
4094 __dead static void
4095 usage_diff(void)
4096 {
4097 	endwin();
4098 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4099 	    "object1 object2\n", getprogname());
4100 	exit(1);
4101 }
4102 
4103 static int
4104 match_line(const char *line, regex_t *regex, size_t nmatch,
4105     regmatch_t *regmatch)
4106 {
4107 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4108 }
4109 
4110 static struct tog_color *
4111 match_color(struct tog_colors *colors, const char *line)
4112 {
4113 	struct tog_color *tc = NULL;
4114 
4115 	STAILQ_FOREACH(tc, colors, entry) {
4116 		if (match_line(line, &tc->regex, 0, NULL))
4117 			return tc;
4118 	}
4119 
4120 	return NULL;
4121 }
4122 
4123 static const struct got_error *
4124 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4125     WINDOW *window, int skipcol, regmatch_t *regmatch)
4126 {
4127 	const struct got_error *err = NULL;
4128 	char *exstr = NULL;
4129 	wchar_t *wline = NULL;
4130 	int rme, rms, n, width, scrollx;
4131 	int width0 = 0, width1 = 0, width2 = 0;
4132 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4133 
4134 	*wtotal = 0;
4135 
4136 	rms = regmatch->rm_so;
4137 	rme = regmatch->rm_eo;
4138 
4139 	err = expand_tab(&exstr, line);
4140 	if (err)
4141 		return err;
4142 
4143 	/* Split the line into 3 segments, according to match offsets. */
4144 	seg0 = strndup(exstr, rms);
4145 	if (seg0 == NULL) {
4146 		err = got_error_from_errno("strndup");
4147 		goto done;
4148 	}
4149 	seg1 = strndup(exstr + rms, rme - rms);
4150 	if (seg1 == NULL) {
4151 		err = got_error_from_errno("strndup");
4152 		goto done;
4153 	}
4154 	seg2 = strdup(exstr + rme);
4155 	if (seg2 == NULL) {
4156 		err = got_error_from_errno("strndup");
4157 		goto done;
4158 	}
4159 
4160 	/* draw up to matched token if we haven't scrolled past it */
4161 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4162 	    col_tab_align, 1);
4163 	if (err)
4164 		goto done;
4165 	n = MAX(width0 - skipcol, 0);
4166 	if (n) {
4167 		free(wline);
4168 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4169 		    wlimit, col_tab_align, 1);
4170 		if (err)
4171 			goto done;
4172 		waddwstr(window, &wline[scrollx]);
4173 		wlimit -= width;
4174 		*wtotal += width;
4175 	}
4176 
4177 	if (wlimit > 0) {
4178 		int i = 0, w = 0;
4179 		size_t wlen;
4180 
4181 		free(wline);
4182 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4183 		    col_tab_align, 1);
4184 		if (err)
4185 			goto done;
4186 		wlen = wcslen(wline);
4187 		while (i < wlen) {
4188 			width = wcwidth(wline[i]);
4189 			if (width == -1) {
4190 				/* should not happen, tabs are expanded */
4191 				err = got_error(GOT_ERR_RANGE);
4192 				goto done;
4193 			}
4194 			if (width0 + w + width > skipcol)
4195 				break;
4196 			w += width;
4197 			i++;
4198 		}
4199 		/* draw (visible part of) matched token (if scrolled into it) */
4200 		if (width1 - w > 0) {
4201 			wattron(window, A_STANDOUT);
4202 			waddwstr(window, &wline[i]);
4203 			wattroff(window, A_STANDOUT);
4204 			wlimit -= (width1 - w);
4205 			*wtotal += (width1 - w);
4206 		}
4207 	}
4208 
4209 	if (wlimit > 0) {  /* draw rest of line */
4210 		free(wline);
4211 		if (skipcol > width0 + width1) {
4212 			err = format_line(&wline, &width2, &scrollx, seg2,
4213 			    skipcol - (width0 + width1), wlimit,
4214 			    col_tab_align, 1);
4215 			if (err)
4216 				goto done;
4217 			waddwstr(window, &wline[scrollx]);
4218 		} else {
4219 			err = format_line(&wline, &width2, NULL, seg2, 0,
4220 			    wlimit, col_tab_align, 1);
4221 			if (err)
4222 				goto done;
4223 			waddwstr(window, wline);
4224 		}
4225 		*wtotal += width2;
4226 	}
4227 done:
4228 	free(wline);
4229 	free(exstr);
4230 	free(seg0);
4231 	free(seg1);
4232 	free(seg2);
4233 	return err;
4234 }
4235 
4236 static int
4237 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4238 {
4239 	FILE	*f = NULL;
4240 	int	*eof, *first, *selected;
4241 
4242 	if (view->type == TOG_VIEW_DIFF) {
4243 		struct tog_diff_view_state *s = &view->state.diff;
4244 
4245 		first = &s->first_displayed_line;
4246 		selected = first;
4247 		eof = &s->eof;
4248 		f = s->f;
4249 	} else if (view->type == TOG_VIEW_HELP) {
4250 		struct tog_help_view_state *s = &view->state.help;
4251 
4252 		first = &s->first_displayed_line;
4253 		selected = first;
4254 		eof = &s->eof;
4255 		f = s->f;
4256 	} else if (view->type == TOG_VIEW_BLAME) {
4257 		struct tog_blame_view_state *s = &view->state.blame;
4258 
4259 		first = &s->first_displayed_line;
4260 		selected = &s->selected_line;
4261 		eof = &s->eof;
4262 		f = s->blame.f;
4263 	} else
4264 		return 0;
4265 
4266 	/* Center gline in the middle of the page like vi(1). */
4267 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4268 		return 0;
4269 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4270 		rewind(f);
4271 		*eof = 0;
4272 		*first = 1;
4273 		*lineno = 0;
4274 		*nprinted = 0;
4275 		return 0;
4276 	}
4277 
4278 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4279 		view->gline : (view->nlines - 3) / 2 + 1;
4280 	view->gline = 0;
4281 
4282 	return 1;
4283 }
4284 
4285 static const struct got_error *
4286 draw_file(struct tog_view *view, const char *header)
4287 {
4288 	struct tog_diff_view_state *s = &view->state.diff;
4289 	regmatch_t *regmatch = &view->regmatch;
4290 	const struct got_error *err;
4291 	int nprinted = 0;
4292 	char *line;
4293 	size_t linesize = 0;
4294 	ssize_t linelen;
4295 	wchar_t *wline;
4296 	int width;
4297 	int max_lines = view->nlines;
4298 	int nlines = s->nlines;
4299 	off_t line_offset;
4300 
4301 	s->lineno = s->first_displayed_line - 1;
4302 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4303 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4304 		return got_error_from_errno("fseek");
4305 
4306 	werase(view->window);
4307 
4308 	if (view->gline > s->nlines - 1)
4309 		view->gline = s->nlines - 1;
4310 
4311 	if (header) {
4312 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4313 		    1 : view->gline - (view->nlines - 3) / 2 :
4314 		    s->lineno + s->selected_line;
4315 
4316 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4317 			return got_error_from_errno("asprintf");
4318 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4319 		    0, 0);
4320 		free(line);
4321 		if (err)
4322 			return err;
4323 
4324 		if (view_needs_focus_indication(view))
4325 			wstandout(view->window);
4326 		waddwstr(view->window, wline);
4327 		free(wline);
4328 		wline = NULL;
4329 		while (width++ < view->ncols)
4330 			waddch(view->window, ' ');
4331 		if (view_needs_focus_indication(view))
4332 			wstandend(view->window);
4333 
4334 		if (max_lines <= 1)
4335 			return NULL;
4336 		max_lines--;
4337 	}
4338 
4339 	s->eof = 0;
4340 	view->maxx = 0;
4341 	line = NULL;
4342 	while (max_lines > 0 && nprinted < max_lines) {
4343 		enum got_diff_line_type linetype;
4344 		attr_t attr = 0;
4345 
4346 		linelen = getline(&line, &linesize, s->f);
4347 		if (linelen == -1) {
4348 			if (feof(s->f)) {
4349 				s->eof = 1;
4350 				break;
4351 			}
4352 			free(line);
4353 			return got_ferror(s->f, GOT_ERR_IO);
4354 		}
4355 
4356 		if (++s->lineno < s->first_displayed_line)
4357 			continue;
4358 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4359 			continue;
4360 		if (s->lineno == view->hiline)
4361 			attr = A_STANDOUT;
4362 
4363 		/* Set view->maxx based on full line length. */
4364 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4365 		    view->x ? 1 : 0);
4366 		if (err) {
4367 			free(line);
4368 			return err;
4369 		}
4370 		view->maxx = MAX(view->maxx, width);
4371 		free(wline);
4372 		wline = NULL;
4373 
4374 		linetype = s->lines[s->lineno].type;
4375 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4376 		    linetype < GOT_DIFF_LINE_CONTEXT)
4377 			attr |= COLOR_PAIR(linetype);
4378 		if (attr)
4379 			wattron(view->window, attr);
4380 		if (s->first_displayed_line + nprinted == s->matched_line &&
4381 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4382 			err = add_matched_line(&width, line, view->ncols, 0,
4383 			    view->window, view->x, regmatch);
4384 			if (err) {
4385 				free(line);
4386 				return err;
4387 			}
4388 		} else {
4389 			int skip;
4390 			err = format_line(&wline, &width, &skip, line,
4391 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4392 			if (err) {
4393 				free(line);
4394 				return err;
4395 			}
4396 			waddwstr(view->window, &wline[skip]);
4397 			free(wline);
4398 			wline = NULL;
4399 		}
4400 		if (s->lineno == view->hiline) {
4401 			/* highlight full gline length */
4402 			while (width++ < view->ncols)
4403 				waddch(view->window, ' ');
4404 		} else {
4405 			if (width <= view->ncols - 1)
4406 				waddch(view->window, '\n');
4407 		}
4408 		if (attr)
4409 			wattroff(view->window, attr);
4410 		if (++nprinted == 1)
4411 			s->first_displayed_line = s->lineno;
4412 	}
4413 	free(line);
4414 	if (nprinted >= 1)
4415 		s->last_displayed_line = s->first_displayed_line +
4416 		    (nprinted - 1);
4417 	else
4418 		s->last_displayed_line = s->first_displayed_line;
4419 
4420 	view_border(view);
4421 
4422 	if (s->eof) {
4423 		while (nprinted < view->nlines) {
4424 			waddch(view->window, '\n');
4425 			nprinted++;
4426 		}
4427 
4428 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4429 		    view->ncols, 0, 0);
4430 		if (err) {
4431 			return err;
4432 		}
4433 
4434 		wstandout(view->window);
4435 		waddwstr(view->window, wline);
4436 		free(wline);
4437 		wline = NULL;
4438 		wstandend(view->window);
4439 	}
4440 
4441 	return NULL;
4442 }
4443 
4444 static char *
4445 get_datestr(time_t *time, char *datebuf)
4446 {
4447 	struct tm mytm, *tm;
4448 	char *p, *s;
4449 
4450 	tm = gmtime_r(time, &mytm);
4451 	if (tm == NULL)
4452 		return NULL;
4453 	s = asctime_r(tm, datebuf);
4454 	if (s == NULL)
4455 		return NULL;
4456 	p = strchr(s, '\n');
4457 	if (p)
4458 		*p = '\0';
4459 	return s;
4460 }
4461 
4462 static const struct got_error *
4463 get_changed_paths(struct got_pathlist_head *paths,
4464     struct got_commit_object *commit, struct got_repository *repo,
4465     struct got_diffstat_cb_arg *dsa)
4466 {
4467 	const struct got_error *err = NULL;
4468 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4469 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4470 	struct got_object_qid *qid;
4471 	FILE *f1 = NULL, *f2 = NULL;
4472 	int fd1 = -1, fd2 = -1;
4473 
4474 	f1 = got_opentemp();
4475 	if (f1 == NULL) {
4476 		err = got_error_from_errno("got_opentemp");
4477 		goto done;
4478 	}
4479 	f2 = got_opentemp();
4480 	if (f2 == NULL) {
4481 		err = got_error_from_errno("got_opentemp");
4482 		goto done;
4483 	}
4484 
4485 	fd1 = got_opentempfd();
4486 	if (fd1 == -1) {
4487 		err = got_error_from_errno("got_opentempfd");
4488 		goto done;
4489 	}
4490 	fd2 = got_opentempfd();
4491 	if (fd2 == -1) {
4492 		err = got_error_from_errno("got_opentempfd");
4493 		goto done;
4494 	}
4495 
4496 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4497 	if (qid != NULL) {
4498 		struct got_commit_object *pcommit;
4499 		err = got_object_open_as_commit(&pcommit, repo,
4500 		    &qid->id);
4501 		if (err)
4502 			return err;
4503 
4504 		tree_id1 = got_object_id_dup(
4505 		    got_object_commit_get_tree_id(pcommit));
4506 		if (tree_id1 == NULL) {
4507 			got_object_commit_close(pcommit);
4508 			return got_error_from_errno("got_object_id_dup");
4509 		}
4510 		got_object_commit_close(pcommit);
4511 
4512 	}
4513 
4514 	if (tree_id1) {
4515 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4516 		if (err)
4517 			goto done;
4518 	}
4519 
4520 	tree_id2 = got_object_commit_get_tree_id(commit);
4521 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4522 	if (err)
4523 		goto done;
4524 
4525 	err = got_diff_tree(tree1, tree2, f1, f2, fd1, fd2, "", "", repo,
4526 	    got_diff_tree_compute_diffstat, dsa, 1);
4527 done:
4528 	if (tree1)
4529 		got_object_tree_close(tree1);
4530 	if (tree2)
4531 		got_object_tree_close(tree2);
4532 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
4533 		err = got_error_from_errno("close");
4534 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
4535 		err = got_error_from_errno("close");
4536 	if (f1 && fclose(f1) == EOF && err == NULL)
4537 		err = got_error_from_errno("fclose");
4538 	if (f2 && fclose(f2) == EOF && err == NULL)
4539 		err = got_error_from_errno("fclose");
4540 	free(tree_id1);
4541 	return err;
4542 }
4543 
4544 static const struct got_error *
4545 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4546     off_t off, uint8_t type)
4547 {
4548 	struct got_diff_line *p;
4549 
4550 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4551 	if (p == NULL)
4552 		return got_error_from_errno("reallocarray");
4553 	*lines = p;
4554 	(*lines)[*nlines].offset = off;
4555 	(*lines)[*nlines].type = type;
4556 	(*nlines)++;
4557 
4558 	return NULL;
4559 }
4560 
4561 static const struct got_error *
4562 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4563     struct got_object_id *commit_id, struct got_reflist_head *refs,
4564     struct got_repository *repo, int ignore_ws, int force_text_diff,
4565     FILE *outfile)
4566 {
4567 	const struct got_error *err = NULL;
4568 	char datebuf[26], *datestr;
4569 	struct got_commit_object *commit;
4570 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4571 	time_t committer_time;
4572 	const char *author, *committer;
4573 	char *refs_str = NULL;
4574 	struct got_pathlist_head changed_paths;
4575 	struct got_pathlist_entry *pe;
4576 	struct got_diffstat_cb_arg dsa = { 0, 0, 0, 0, 0, 0, &changed_paths,
4577 	    ignore_ws, force_text_diff, tog_diff_algo };
4578 	off_t outoff = 0;
4579 	int n;
4580 
4581 	TAILQ_INIT(&changed_paths);
4582 
4583 	if (refs) {
4584 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4585 		if (err)
4586 			return err;
4587 	}
4588 
4589 	err = got_object_open_as_commit(&commit, repo, commit_id);
4590 	if (err)
4591 		return err;
4592 
4593 	err = got_object_id_str(&id_str, commit_id);
4594 	if (err) {
4595 		err = got_error_from_errno("got_object_id_str");
4596 		goto done;
4597 	}
4598 
4599 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4600 	if (err)
4601 		goto done;
4602 
4603 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4604 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4605 	if (n < 0) {
4606 		err = got_error_from_errno("fprintf");
4607 		goto done;
4608 	}
4609 	outoff += n;
4610 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4611 	if (err)
4612 		goto done;
4613 
4614 	n = fprintf(outfile, "from: %s\n",
4615 	    got_object_commit_get_author(commit));
4616 	if (n < 0) {
4617 		err = got_error_from_errno("fprintf");
4618 		goto done;
4619 	}
4620 	outoff += n;
4621 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4622 	if (err)
4623 		goto done;
4624 
4625 	author = got_object_commit_get_author(commit);
4626 	committer = got_object_commit_get_committer(commit);
4627 	if (strcmp(author, committer) != 0) {
4628 		n = fprintf(outfile, "via: %s\n", committer);
4629 		if (n < 0) {
4630 			err = got_error_from_errno("fprintf");
4631 			goto done;
4632 		}
4633 		outoff += n;
4634 		err = add_line_metadata(lines, nlines, outoff,
4635 		    GOT_DIFF_LINE_AUTHOR);
4636 		if (err)
4637 			goto done;
4638 	}
4639 	committer_time = got_object_commit_get_committer_time(commit);
4640 	datestr = get_datestr(&committer_time, datebuf);
4641 	if (datestr) {
4642 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4643 		if (n < 0) {
4644 			err = got_error_from_errno("fprintf");
4645 			goto done;
4646 		}
4647 		outoff += n;
4648 		err = add_line_metadata(lines, nlines, outoff,
4649 		    GOT_DIFF_LINE_DATE);
4650 		if (err)
4651 			goto done;
4652 	}
4653 	if (got_object_commit_get_nparents(commit) > 1) {
4654 		const struct got_object_id_queue *parent_ids;
4655 		struct got_object_qid *qid;
4656 		int pn = 1;
4657 		parent_ids = got_object_commit_get_parent_ids(commit);
4658 		STAILQ_FOREACH(qid, parent_ids, entry) {
4659 			err = got_object_id_str(&id_str, &qid->id);
4660 			if (err)
4661 				goto done;
4662 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4663 			if (n < 0) {
4664 				err = got_error_from_errno("fprintf");
4665 				goto done;
4666 			}
4667 			outoff += n;
4668 			err = add_line_metadata(lines, nlines, outoff,
4669 			    GOT_DIFF_LINE_META);
4670 			if (err)
4671 				goto done;
4672 			free(id_str);
4673 			id_str = NULL;
4674 		}
4675 	}
4676 
4677 	err = got_object_commit_get_logmsg(&logmsg, commit);
4678 	if (err)
4679 		goto done;
4680 	s = logmsg;
4681 	while ((line = strsep(&s, "\n")) != NULL) {
4682 		n = fprintf(outfile, "%s\n", line);
4683 		if (n < 0) {
4684 			err = got_error_from_errno("fprintf");
4685 			goto done;
4686 		}
4687 		outoff += n;
4688 		err = add_line_metadata(lines, nlines, outoff,
4689 		    GOT_DIFF_LINE_LOGMSG);
4690 		if (err)
4691 			goto done;
4692 	}
4693 
4694 	err = get_changed_paths(&changed_paths, commit, repo, &dsa);
4695 	if (err)
4696 		goto done;
4697 
4698 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4699 		struct got_diff_changed_path *cp = pe->data;
4700 		int pad = dsa.max_path_len - pe->path_len + 1;
4701 
4702 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4703 		    pe->path, pad, ' ', dsa.add_cols + 1, cp->add,
4704 		    dsa.rm_cols + 1, cp->rm);
4705 		if (n < 0) {
4706 			err = got_error_from_errno("fprintf");
4707 			goto done;
4708 		}
4709 		outoff += n;
4710 		err = add_line_metadata(lines, nlines, outoff,
4711 		    GOT_DIFF_LINE_CHANGES);
4712 		if (err)
4713 			goto done;
4714 	}
4715 
4716 	fputc('\n', outfile);
4717 	outoff++;
4718 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4719 	if (err)
4720 		goto done;
4721 
4722 	n = fprintf(outfile,
4723 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4724 	    dsa.nfiles, dsa.nfiles > 1 ? "s" : "", dsa.ins,
4725 	    dsa.ins != 1 ? "s" : "", dsa.del, dsa.del != 1 ? "s" : "");
4726 	if (n < 0) {
4727 		err = got_error_from_errno("fprintf");
4728 		goto done;
4729 	}
4730 	outoff += n;
4731 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4732 	if (err)
4733 		goto done;
4734 
4735 	fputc('\n', outfile);
4736 	outoff++;
4737 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4738 done:
4739 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4740 	free(id_str);
4741 	free(logmsg);
4742 	free(refs_str);
4743 	got_object_commit_close(commit);
4744 	if (err) {
4745 		free(*lines);
4746 		*lines = NULL;
4747 		*nlines = 0;
4748 	}
4749 	return err;
4750 }
4751 
4752 static const struct got_error *
4753 create_diff(struct tog_diff_view_state *s)
4754 {
4755 	const struct got_error *err = NULL;
4756 	FILE *f = NULL;
4757 	int obj_type;
4758 
4759 	free(s->lines);
4760 	s->lines = malloc(sizeof(*s->lines));
4761 	if (s->lines == NULL)
4762 		return got_error_from_errno("malloc");
4763 	s->nlines = 0;
4764 
4765 	f = got_opentemp();
4766 	if (f == NULL) {
4767 		err = got_error_from_errno("got_opentemp");
4768 		goto done;
4769 	}
4770 	if (s->f && fclose(s->f) == EOF) {
4771 		err = got_error_from_errno("fclose");
4772 		goto done;
4773 	}
4774 	s->f = f;
4775 
4776 	if (s->id1)
4777 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4778 	else
4779 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4780 	if (err)
4781 		goto done;
4782 
4783 	switch (obj_type) {
4784 	case GOT_OBJ_TYPE_BLOB:
4785 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4786 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4787 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4788 		    s->ignore_whitespace, s->force_text_diff, 0, NULL, s->repo,
4789 		    s->f);
4790 		break;
4791 	case GOT_OBJ_TYPE_TREE:
4792 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4793 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4794 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4795 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4796 		break;
4797 	case GOT_OBJ_TYPE_COMMIT: {
4798 		const struct got_object_id_queue *parent_ids;
4799 		struct got_object_qid *pid;
4800 		struct got_commit_object *commit2;
4801 		struct got_reflist_head *refs;
4802 
4803 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4804 		if (err)
4805 			goto done;
4806 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4807 		/* Show commit info if we're diffing to a parent/root commit. */
4808 		if (s->id1 == NULL) {
4809 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4810 			    refs, s->repo, s->ignore_whitespace,
4811 			    s->force_text_diff, s->f);
4812 			if (err)
4813 				goto done;
4814 		} else {
4815 			parent_ids = got_object_commit_get_parent_ids(commit2);
4816 			STAILQ_FOREACH(pid, parent_ids, entry) {
4817 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4818 					err = write_commit_info(&s->lines,
4819 					    &s->nlines, s->id2, refs, s->repo,
4820 					    s->ignore_whitespace,
4821 					    s->force_text_diff, s->f);
4822 					if (err)
4823 						goto done;
4824 					break;
4825 				}
4826 			}
4827 		}
4828 		got_object_commit_close(commit2);
4829 
4830 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4831 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4832 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4833 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4834 		break;
4835 	}
4836 	default:
4837 		err = got_error(GOT_ERR_OBJ_TYPE);
4838 		break;
4839 	}
4840 done:
4841 	if (s->f && fflush(s->f) != 0 && err == NULL)
4842 		err = got_error_from_errno("fflush");
4843 	return err;
4844 }
4845 
4846 static void
4847 diff_view_indicate_progress(struct tog_view *view)
4848 {
4849 	mvwaddstr(view->window, 0, 0, "diffing...");
4850 	update_panels();
4851 	doupdate();
4852 }
4853 
4854 static const struct got_error *
4855 search_start_diff_view(struct tog_view *view)
4856 {
4857 	struct tog_diff_view_state *s = &view->state.diff;
4858 
4859 	s->matched_line = 0;
4860 	return NULL;
4861 }
4862 
4863 static void
4864 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4865     size_t *nlines, int **first, int **last, int **match, int **selected)
4866 {
4867 	struct tog_diff_view_state *s = &view->state.diff;
4868 
4869 	*f = s->f;
4870 	*nlines = s->nlines;
4871 	*line_offsets = NULL;
4872 	*match = &s->matched_line;
4873 	*first = &s->first_displayed_line;
4874 	*last = &s->last_displayed_line;
4875 	*selected = &s->selected_line;
4876 }
4877 
4878 static const struct got_error *
4879 search_next_view_match(struct tog_view *view)
4880 {
4881 	const struct got_error *err = NULL;
4882 	FILE *f;
4883 	int lineno;
4884 	char *line = NULL;
4885 	size_t linesize = 0;
4886 	ssize_t linelen;
4887 	off_t *line_offsets;
4888 	size_t nlines = 0;
4889 	int *first, *last, *match, *selected;
4890 
4891 	if (!view->search_setup)
4892 		return got_error_msg(GOT_ERR_NOT_IMPL,
4893 		    "view search not supported");
4894 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4895 	    &match, &selected);
4896 
4897 	if (!view->searching) {
4898 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4899 		return NULL;
4900 	}
4901 
4902 	if (*match) {
4903 		if (view->searching == TOG_SEARCH_FORWARD)
4904 			lineno = *match + 1;
4905 		else
4906 			lineno = *match - 1;
4907 	} else
4908 		lineno = *first - 1 + *selected;
4909 
4910 	while (1) {
4911 		off_t offset;
4912 
4913 		if (lineno <= 0 || lineno > nlines) {
4914 			if (*match == 0) {
4915 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4916 				break;
4917 			}
4918 
4919 			if (view->searching == TOG_SEARCH_FORWARD)
4920 				lineno = 1;
4921 			else
4922 				lineno = nlines;
4923 		}
4924 
4925 		offset = view->type == TOG_VIEW_DIFF ?
4926 		    view->state.diff.lines[lineno - 1].offset :
4927 		    line_offsets[lineno - 1];
4928 		if (fseeko(f, offset, SEEK_SET) != 0) {
4929 			free(line);
4930 			return got_error_from_errno("fseeko");
4931 		}
4932 		linelen = getline(&line, &linesize, f);
4933 		if (linelen != -1) {
4934 			char *exstr;
4935 			err = expand_tab(&exstr, line);
4936 			if (err)
4937 				break;
4938 			if (match_line(exstr, &view->regex, 1,
4939 			    &view->regmatch)) {
4940 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4941 				*match = lineno;
4942 				free(exstr);
4943 				break;
4944 			}
4945 			free(exstr);
4946 		}
4947 		if (view->searching == TOG_SEARCH_FORWARD)
4948 			lineno++;
4949 		else
4950 			lineno--;
4951 	}
4952 	free(line);
4953 
4954 	if (*match) {
4955 		*first = *match;
4956 		*selected = 1;
4957 	}
4958 
4959 	return err;
4960 }
4961 
4962 static const struct got_error *
4963 close_diff_view(struct tog_view *view)
4964 {
4965 	const struct got_error *err = NULL;
4966 	struct tog_diff_view_state *s = &view->state.diff;
4967 
4968 	free(s->id1);
4969 	s->id1 = NULL;
4970 	free(s->id2);
4971 	s->id2 = NULL;
4972 	if (s->f && fclose(s->f) == EOF)
4973 		err = got_error_from_errno("fclose");
4974 	s->f = NULL;
4975 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4976 		err = got_error_from_errno("fclose");
4977 	s->f1 = NULL;
4978 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4979 		err = got_error_from_errno("fclose");
4980 	s->f2 = NULL;
4981 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4982 		err = got_error_from_errno("close");
4983 	s->fd1 = -1;
4984 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4985 		err = got_error_from_errno("close");
4986 	s->fd2 = -1;
4987 	free(s->lines);
4988 	s->lines = NULL;
4989 	s->nlines = 0;
4990 	return err;
4991 }
4992 
4993 static const struct got_error *
4994 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4995     struct got_object_id *id2, const char *label1, const char *label2,
4996     int diff_context, int ignore_whitespace, int force_text_diff,
4997     struct tog_view *parent_view, struct got_repository *repo)
4998 {
4999 	const struct got_error *err;
5000 	struct tog_diff_view_state *s = &view->state.diff;
5001 
5002 	memset(s, 0, sizeof(*s));
5003 	s->fd1 = -1;
5004 	s->fd2 = -1;
5005 
5006 	if (id1 != NULL && id2 != NULL) {
5007 	    int type1, type2;
5008 	    err = got_object_get_type(&type1, repo, id1);
5009 	    if (err)
5010 		return err;
5011 	    err = got_object_get_type(&type2, repo, id2);
5012 	    if (err)
5013 		return err;
5014 
5015 	    if (type1 != type2)
5016 		return got_error(GOT_ERR_OBJ_TYPE);
5017 	}
5018 	s->first_displayed_line = 1;
5019 	s->last_displayed_line = view->nlines;
5020 	s->selected_line = 1;
5021 	s->repo = repo;
5022 	s->id1 = id1;
5023 	s->id2 = id2;
5024 	s->label1 = label1;
5025 	s->label2 = label2;
5026 
5027 	if (id1) {
5028 		s->id1 = got_object_id_dup(id1);
5029 		if (s->id1 == NULL)
5030 			return got_error_from_errno("got_object_id_dup");
5031 	} else
5032 		s->id1 = NULL;
5033 
5034 	s->id2 = got_object_id_dup(id2);
5035 	if (s->id2 == NULL) {
5036 		err = got_error_from_errno("got_object_id_dup");
5037 		goto done;
5038 	}
5039 
5040 	s->f1 = got_opentemp();
5041 	if (s->f1 == NULL) {
5042 		err = got_error_from_errno("got_opentemp");
5043 		goto done;
5044 	}
5045 
5046 	s->f2 = got_opentemp();
5047 	if (s->f2 == NULL) {
5048 		err = got_error_from_errno("got_opentemp");
5049 		goto done;
5050 	}
5051 
5052 	s->fd1 = got_opentempfd();
5053 	if (s->fd1 == -1) {
5054 		err = got_error_from_errno("got_opentempfd");
5055 		goto done;
5056 	}
5057 
5058 	s->fd2 = got_opentempfd();
5059 	if (s->fd2 == -1) {
5060 		err = got_error_from_errno("got_opentempfd");
5061 		goto done;
5062 	}
5063 
5064 	s->diff_context = diff_context;
5065 	s->ignore_whitespace = ignore_whitespace;
5066 	s->force_text_diff = force_text_diff;
5067 	s->parent_view = parent_view;
5068 	s->repo = repo;
5069 
5070 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5071 		int rc;
5072 
5073 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5074 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5075 		if (rc != ERR)
5076 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5077 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5078 		if (rc != ERR)
5079 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5080 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5081 		if (rc != ERR)
5082 			rc = init_pair(GOT_DIFF_LINE_META,
5083 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5084 		if (rc != ERR)
5085 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5086 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5087 		if (rc != ERR)
5088 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5089 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5090 		if (rc != ERR)
5091 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5092 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5093 		if (rc != ERR)
5094 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5095 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5096 		if (rc != ERR)
5097 			rc = init_pair(GOT_DIFF_LINE_DATE,
5098 			    get_color_value("TOG_COLOR_DATE"), -1);
5099 		if (rc == ERR) {
5100 			err = got_error(GOT_ERR_RANGE);
5101 			goto done;
5102 		}
5103 	}
5104 
5105 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5106 	    view_is_splitscreen(view))
5107 		show_log_view(parent_view); /* draw border */
5108 	diff_view_indicate_progress(view);
5109 
5110 	err = create_diff(s);
5111 
5112 	view->show = show_diff_view;
5113 	view->input = input_diff_view;
5114 	view->reset = reset_diff_view;
5115 	view->close = close_diff_view;
5116 	view->search_start = search_start_diff_view;
5117 	view->search_setup = search_setup_diff_view;
5118 	view->search_next = search_next_view_match;
5119 done:
5120 	if (err)
5121 		close_diff_view(view);
5122 	return err;
5123 }
5124 
5125 static const struct got_error *
5126 show_diff_view(struct tog_view *view)
5127 {
5128 	const struct got_error *err;
5129 	struct tog_diff_view_state *s = &view->state.diff;
5130 	char *id_str1 = NULL, *id_str2, *header;
5131 	const char *label1, *label2;
5132 
5133 	if (s->id1) {
5134 		err = got_object_id_str(&id_str1, s->id1);
5135 		if (err)
5136 			return err;
5137 		label1 = s->label1 ? s->label1 : id_str1;
5138 	} else
5139 		label1 = "/dev/null";
5140 
5141 	err = got_object_id_str(&id_str2, s->id2);
5142 	if (err)
5143 		return err;
5144 	label2 = s->label2 ? s->label2 : id_str2;
5145 
5146 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5147 		err = got_error_from_errno("asprintf");
5148 		free(id_str1);
5149 		free(id_str2);
5150 		return err;
5151 	}
5152 	free(id_str1);
5153 	free(id_str2);
5154 
5155 	err = draw_file(view, header);
5156 	free(header);
5157 	return err;
5158 }
5159 
5160 static const struct got_error *
5161 set_selected_commit(struct tog_diff_view_state *s,
5162     struct commit_queue_entry *entry)
5163 {
5164 	const struct got_error *err;
5165 	const struct got_object_id_queue *parent_ids;
5166 	struct got_commit_object *selected_commit;
5167 	struct got_object_qid *pid;
5168 
5169 	free(s->id2);
5170 	s->id2 = got_object_id_dup(entry->id);
5171 	if (s->id2 == NULL)
5172 		return got_error_from_errno("got_object_id_dup");
5173 
5174 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5175 	if (err)
5176 		return err;
5177 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5178 	free(s->id1);
5179 	pid = STAILQ_FIRST(parent_ids);
5180 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5181 	got_object_commit_close(selected_commit);
5182 	return NULL;
5183 }
5184 
5185 static const struct got_error *
5186 reset_diff_view(struct tog_view *view)
5187 {
5188 	struct tog_diff_view_state *s = &view->state.diff;
5189 
5190 	view->count = 0;
5191 	wclear(view->window);
5192 	s->first_displayed_line = 1;
5193 	s->last_displayed_line = view->nlines;
5194 	s->matched_line = 0;
5195 	diff_view_indicate_progress(view);
5196 	return create_diff(s);
5197 }
5198 
5199 static void
5200 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5201 {
5202 	int start, i;
5203 
5204 	i = start = s->first_displayed_line - 1;
5205 
5206 	while (s->lines[i].type != type) {
5207 		if (i == 0)
5208 			i = s->nlines - 1;
5209 		if (--i == start)
5210 			return; /* do nothing, requested type not in file */
5211 	}
5212 
5213 	s->selected_line = 1;
5214 	s->first_displayed_line = i;
5215 }
5216 
5217 static void
5218 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5219 {
5220 	int start, i;
5221 
5222 	i = start = s->first_displayed_line + 1;
5223 
5224 	while (s->lines[i].type != type) {
5225 		if (i == s->nlines - 1)
5226 			i = 0;
5227 		if (++i == start)
5228 			return; /* do nothing, requested type not in file */
5229 	}
5230 
5231 	s->selected_line = 1;
5232 	s->first_displayed_line = i;
5233 }
5234 
5235 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5236     int, int, int);
5237 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5238     int, int);
5239 
5240 static const struct got_error *
5241 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5242 {
5243 	const struct got_error *err = NULL;
5244 	struct tog_diff_view_state *s = &view->state.diff;
5245 	struct tog_log_view_state *ls;
5246 	struct commit_queue_entry *old_selected_entry;
5247 	char *line = NULL;
5248 	size_t linesize = 0;
5249 	ssize_t linelen;
5250 	int i, nscroll = view->nlines - 1, up = 0;
5251 
5252 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5253 
5254 	switch (ch) {
5255 	case '0':
5256 		view->x = 0;
5257 		break;
5258 	case '$':
5259 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5260 		view->count = 0;
5261 		break;
5262 	case KEY_RIGHT:
5263 	case 'l':
5264 		if (view->x + view->ncols / 3 < view->maxx)
5265 			view->x += 2;  /* move two columns right */
5266 		else
5267 			view->count = 0;
5268 		break;
5269 	case KEY_LEFT:
5270 	case 'h':
5271 		view->x -= MIN(view->x, 2);  /* move two columns back */
5272 		if (view->x <= 0)
5273 			view->count = 0;
5274 		break;
5275 	case 'a':
5276 	case 'w':
5277 		if (ch == 'a')
5278 			s->force_text_diff = !s->force_text_diff;
5279 		else if (ch == 'w')
5280 			s->ignore_whitespace = !s->ignore_whitespace;
5281 		err = reset_diff_view(view);
5282 		break;
5283 	case 'g':
5284 	case KEY_HOME:
5285 		s->first_displayed_line = 1;
5286 		view->count = 0;
5287 		break;
5288 	case 'G':
5289 	case KEY_END:
5290 		view->count = 0;
5291 		if (s->eof)
5292 			break;
5293 
5294 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5295 		s->eof = 1;
5296 		break;
5297 	case 'k':
5298 	case KEY_UP:
5299 	case CTRL('p'):
5300 		if (s->first_displayed_line > 1)
5301 			s->first_displayed_line--;
5302 		else
5303 			view->count = 0;
5304 		break;
5305 	case CTRL('u'):
5306 	case 'u':
5307 		nscroll /= 2;
5308 		/* FALL THROUGH */
5309 	case KEY_PPAGE:
5310 	case CTRL('b'):
5311 	case 'b':
5312 		if (s->first_displayed_line == 1) {
5313 			view->count = 0;
5314 			break;
5315 		}
5316 		i = 0;
5317 		while (i++ < nscroll && s->first_displayed_line > 1)
5318 			s->first_displayed_line--;
5319 		break;
5320 	case 'j':
5321 	case KEY_DOWN:
5322 	case CTRL('n'):
5323 		if (!s->eof)
5324 			s->first_displayed_line++;
5325 		else
5326 			view->count = 0;
5327 		break;
5328 	case CTRL('d'):
5329 	case 'd':
5330 		nscroll /= 2;
5331 		/* FALL THROUGH */
5332 	case KEY_NPAGE:
5333 	case CTRL('f'):
5334 	case 'f':
5335 	case ' ':
5336 		if (s->eof) {
5337 			view->count = 0;
5338 			break;
5339 		}
5340 		i = 0;
5341 		while (!s->eof && i++ < nscroll) {
5342 			linelen = getline(&line, &linesize, s->f);
5343 			s->first_displayed_line++;
5344 			if (linelen == -1) {
5345 				if (feof(s->f)) {
5346 					s->eof = 1;
5347 				} else
5348 					err = got_ferror(s->f, GOT_ERR_IO);
5349 				break;
5350 			}
5351 		}
5352 		free(line);
5353 		break;
5354 	case '(':
5355 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5356 		break;
5357 	case ')':
5358 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5359 		break;
5360 	case '{':
5361 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5362 		break;
5363 	case '}':
5364 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5365 		break;
5366 	case '[':
5367 		if (s->diff_context > 0) {
5368 			s->diff_context--;
5369 			s->matched_line = 0;
5370 			diff_view_indicate_progress(view);
5371 			err = create_diff(s);
5372 			if (s->first_displayed_line + view->nlines - 1 >
5373 			    s->nlines) {
5374 				s->first_displayed_line = 1;
5375 				s->last_displayed_line = view->nlines;
5376 			}
5377 		} else
5378 			view->count = 0;
5379 		break;
5380 	case ']':
5381 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5382 			s->diff_context++;
5383 			s->matched_line = 0;
5384 			diff_view_indicate_progress(view);
5385 			err = create_diff(s);
5386 		} else
5387 			view->count = 0;
5388 		break;
5389 	case '<':
5390 	case ',':
5391 	case 'K':
5392 		up = 1;
5393 		/* FALL THROUGH */
5394 	case '>':
5395 	case '.':
5396 	case 'J':
5397 		if (s->parent_view == NULL) {
5398 			view->count = 0;
5399 			break;
5400 		}
5401 		s->parent_view->count = view->count;
5402 
5403 		if (s->parent_view->type == TOG_VIEW_LOG) {
5404 			ls = &s->parent_view->state.log;
5405 			old_selected_entry = ls->selected_entry;
5406 
5407 			err = input_log_view(NULL, s->parent_view,
5408 			    up ? KEY_UP : KEY_DOWN);
5409 			if (err)
5410 				break;
5411 			view->count = s->parent_view->count;
5412 
5413 			if (old_selected_entry == ls->selected_entry)
5414 				break;
5415 
5416 			err = set_selected_commit(s, ls->selected_entry);
5417 			if (err)
5418 				break;
5419 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5420 			struct tog_blame_view_state *bs;
5421 			struct got_object_id *id, *prev_id;
5422 
5423 			bs = &s->parent_view->state.blame;
5424 			prev_id = get_annotation_for_line(bs->blame.lines,
5425 			    bs->blame.nlines, bs->last_diffed_line);
5426 
5427 			err = input_blame_view(&view, s->parent_view,
5428 			    up ? KEY_UP : KEY_DOWN);
5429 			if (err)
5430 				break;
5431 			view->count = s->parent_view->count;
5432 
5433 			if (prev_id == NULL)
5434 				break;
5435 			id = get_selected_commit_id(bs->blame.lines,
5436 			    bs->blame.nlines, bs->first_displayed_line,
5437 			    bs->selected_line);
5438 			if (id == NULL)
5439 				break;
5440 
5441 			if (!got_object_id_cmp(prev_id, id))
5442 				break;
5443 
5444 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5445 			if (err)
5446 				break;
5447 		}
5448 		s->first_displayed_line = 1;
5449 		s->last_displayed_line = view->nlines;
5450 		s->matched_line = 0;
5451 		view->x = 0;
5452 
5453 		diff_view_indicate_progress(view);
5454 		err = create_diff(s);
5455 		break;
5456 	default:
5457 		view->count = 0;
5458 		break;
5459 	}
5460 
5461 	return err;
5462 }
5463 
5464 static const struct got_error *
5465 cmd_diff(int argc, char *argv[])
5466 {
5467 	const struct got_error *error = NULL;
5468 	struct got_repository *repo = NULL;
5469 	struct got_worktree *worktree = NULL;
5470 	struct got_object_id *id1 = NULL, *id2 = NULL;
5471 	char *repo_path = NULL, *cwd = NULL;
5472 	char *id_str1 = NULL, *id_str2 = NULL;
5473 	char *label1 = NULL, *label2 = NULL;
5474 	int diff_context = 3, ignore_whitespace = 0;
5475 	int ch, force_text_diff = 0;
5476 	const char *errstr;
5477 	struct tog_view *view;
5478 	int *pack_fds = NULL;
5479 
5480 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5481 		switch (ch) {
5482 		case 'a':
5483 			force_text_diff = 1;
5484 			break;
5485 		case 'C':
5486 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5487 			    &errstr);
5488 			if (errstr != NULL)
5489 				errx(1, "number of context lines is %s: %s",
5490 				    errstr, errstr);
5491 			break;
5492 		case 'r':
5493 			repo_path = realpath(optarg, NULL);
5494 			if (repo_path == NULL)
5495 				return got_error_from_errno2("realpath",
5496 				    optarg);
5497 			got_path_strip_trailing_slashes(repo_path);
5498 			break;
5499 		case 'w':
5500 			ignore_whitespace = 1;
5501 			break;
5502 		default:
5503 			usage_diff();
5504 			/* NOTREACHED */
5505 		}
5506 	}
5507 
5508 	argc -= optind;
5509 	argv += optind;
5510 
5511 	if (argc == 0) {
5512 		usage_diff(); /* TODO show local worktree changes */
5513 	} else if (argc == 2) {
5514 		id_str1 = argv[0];
5515 		id_str2 = argv[1];
5516 	} else
5517 		usage_diff();
5518 
5519 	error = got_repo_pack_fds_open(&pack_fds);
5520 	if (error)
5521 		goto done;
5522 
5523 	if (repo_path == NULL) {
5524 		cwd = getcwd(NULL, 0);
5525 		if (cwd == NULL)
5526 			return got_error_from_errno("getcwd");
5527 		error = got_worktree_open(&worktree, cwd);
5528 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5529 			goto done;
5530 		if (worktree)
5531 			repo_path =
5532 			    strdup(got_worktree_get_repo_path(worktree));
5533 		else
5534 			repo_path = strdup(cwd);
5535 		if (repo_path == NULL) {
5536 			error = got_error_from_errno("strdup");
5537 			goto done;
5538 		}
5539 	}
5540 
5541 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5542 	if (error)
5543 		goto done;
5544 
5545 	init_curses();
5546 
5547 	error = apply_unveil(got_repo_get_path(repo), NULL);
5548 	if (error)
5549 		goto done;
5550 
5551 	error = tog_load_refs(repo, 0);
5552 	if (error)
5553 		goto done;
5554 
5555 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5556 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5557 	if (error)
5558 		goto done;
5559 
5560 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5561 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5562 	if (error)
5563 		goto done;
5564 
5565 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5566 	if (view == NULL) {
5567 		error = got_error_from_errno("view_open");
5568 		goto done;
5569 	}
5570 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5571 	    ignore_whitespace, force_text_diff, NULL,  repo);
5572 	if (error)
5573 		goto done;
5574 	error = view_loop(view);
5575 done:
5576 	free(label1);
5577 	free(label2);
5578 	free(repo_path);
5579 	free(cwd);
5580 	if (repo) {
5581 		const struct got_error *close_err = got_repo_close(repo);
5582 		if (error == NULL)
5583 			error = close_err;
5584 	}
5585 	if (worktree)
5586 		got_worktree_close(worktree);
5587 	if (pack_fds) {
5588 		const struct got_error *pack_err =
5589 		    got_repo_pack_fds_close(pack_fds);
5590 		if (error == NULL)
5591 			error = pack_err;
5592 	}
5593 	tog_free_refs();
5594 	return error;
5595 }
5596 
5597 __dead static void
5598 usage_blame(void)
5599 {
5600 	endwin();
5601 	fprintf(stderr,
5602 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5603 	    getprogname());
5604 	exit(1);
5605 }
5606 
5607 struct tog_blame_line {
5608 	int annotated;
5609 	struct got_object_id *id;
5610 };
5611 
5612 static const struct got_error *
5613 draw_blame(struct tog_view *view)
5614 {
5615 	struct tog_blame_view_state *s = &view->state.blame;
5616 	struct tog_blame *blame = &s->blame;
5617 	regmatch_t *regmatch = &view->regmatch;
5618 	const struct got_error *err;
5619 	int lineno = 0, nprinted = 0;
5620 	char *line = NULL;
5621 	size_t linesize = 0;
5622 	ssize_t linelen;
5623 	wchar_t *wline;
5624 	int width;
5625 	struct tog_blame_line *blame_line;
5626 	struct got_object_id *prev_id = NULL;
5627 	char *id_str;
5628 	struct tog_color *tc;
5629 
5630 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5631 	if (err)
5632 		return err;
5633 
5634 	rewind(blame->f);
5635 	werase(view->window);
5636 
5637 	if (asprintf(&line, "commit %s", id_str) == -1) {
5638 		err = got_error_from_errno("asprintf");
5639 		free(id_str);
5640 		return err;
5641 	}
5642 
5643 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5644 	free(line);
5645 	line = NULL;
5646 	if (err)
5647 		return err;
5648 	if (view_needs_focus_indication(view))
5649 		wstandout(view->window);
5650 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5651 	if (tc)
5652 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5653 	waddwstr(view->window, wline);
5654 	while (width++ < view->ncols)
5655 		waddch(view->window, ' ');
5656 	if (tc)
5657 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5658 	if (view_needs_focus_indication(view))
5659 		wstandend(view->window);
5660 	free(wline);
5661 	wline = NULL;
5662 
5663 	if (view->gline > blame->nlines)
5664 		view->gline = blame->nlines;
5665 
5666 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5667 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5668 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5669 		free(id_str);
5670 		return got_error_from_errno("asprintf");
5671 	}
5672 	free(id_str);
5673 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5674 	free(line);
5675 	line = NULL;
5676 	if (err)
5677 		return err;
5678 	waddwstr(view->window, wline);
5679 	free(wline);
5680 	wline = NULL;
5681 	if (width < view->ncols - 1)
5682 		waddch(view->window, '\n');
5683 
5684 	s->eof = 0;
5685 	view->maxx = 0;
5686 	while (nprinted < view->nlines - 2) {
5687 		linelen = getline(&line, &linesize, blame->f);
5688 		if (linelen == -1) {
5689 			if (feof(blame->f)) {
5690 				s->eof = 1;
5691 				break;
5692 			}
5693 			free(line);
5694 			return got_ferror(blame->f, GOT_ERR_IO);
5695 		}
5696 		if (++lineno < s->first_displayed_line)
5697 			continue;
5698 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5699 			continue;
5700 
5701 		/* Set view->maxx based on full line length. */
5702 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5703 		if (err) {
5704 			free(line);
5705 			return err;
5706 		}
5707 		free(wline);
5708 		wline = NULL;
5709 		view->maxx = MAX(view->maxx, width);
5710 
5711 		if (nprinted == s->selected_line - 1)
5712 			wstandout(view->window);
5713 
5714 		if (blame->nlines > 0) {
5715 			blame_line = &blame->lines[lineno - 1];
5716 			if (blame_line->annotated && prev_id &&
5717 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5718 			    !(nprinted == s->selected_line - 1)) {
5719 				waddstr(view->window, "        ");
5720 			} else if (blame_line->annotated) {
5721 				char *id_str;
5722 				err = got_object_id_str(&id_str,
5723 				    blame_line->id);
5724 				if (err) {
5725 					free(line);
5726 					return err;
5727 				}
5728 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5729 				if (tc)
5730 					wattr_on(view->window,
5731 					    COLOR_PAIR(tc->colorpair), NULL);
5732 				wprintw(view->window, "%.8s", id_str);
5733 				if (tc)
5734 					wattr_off(view->window,
5735 					    COLOR_PAIR(tc->colorpair), NULL);
5736 				free(id_str);
5737 				prev_id = blame_line->id;
5738 			} else {
5739 				waddstr(view->window, "........");
5740 				prev_id = NULL;
5741 			}
5742 		} else {
5743 			waddstr(view->window, "........");
5744 			prev_id = NULL;
5745 		}
5746 
5747 		if (nprinted == s->selected_line - 1)
5748 			wstandend(view->window);
5749 		waddstr(view->window, " ");
5750 
5751 		if (view->ncols <= 9) {
5752 			width = 9;
5753 		} else if (s->first_displayed_line + nprinted ==
5754 		    s->matched_line &&
5755 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5756 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5757 			    view->window, view->x, regmatch);
5758 			if (err) {
5759 				free(line);
5760 				return err;
5761 			}
5762 			width += 9;
5763 		} else {
5764 			int skip;
5765 			err = format_line(&wline, &width, &skip, line,
5766 			    view->x, view->ncols - 9, 9, 1);
5767 			if (err) {
5768 				free(line);
5769 				return err;
5770 			}
5771 			waddwstr(view->window, &wline[skip]);
5772 			width += 9;
5773 			free(wline);
5774 			wline = NULL;
5775 		}
5776 
5777 		if (width <= view->ncols - 1)
5778 			waddch(view->window, '\n');
5779 		if (++nprinted == 1)
5780 			s->first_displayed_line = lineno;
5781 	}
5782 	free(line);
5783 	s->last_displayed_line = lineno;
5784 
5785 	view_border(view);
5786 
5787 	return NULL;
5788 }
5789 
5790 static const struct got_error *
5791 blame_cb(void *arg, int nlines, int lineno,
5792     struct got_commit_object *commit, struct got_object_id *id)
5793 {
5794 	const struct got_error *err = NULL;
5795 	struct tog_blame_cb_args *a = arg;
5796 	struct tog_blame_line *line;
5797 	int errcode;
5798 
5799 	if (nlines != a->nlines ||
5800 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5801 		return got_error(GOT_ERR_RANGE);
5802 
5803 	errcode = pthread_mutex_lock(&tog_mutex);
5804 	if (errcode)
5805 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5806 
5807 	if (*a->quit) {	/* user has quit the blame view */
5808 		err = got_error(GOT_ERR_ITER_COMPLETED);
5809 		goto done;
5810 	}
5811 
5812 	if (lineno == -1)
5813 		goto done; /* no change in this commit */
5814 
5815 	line = &a->lines[lineno - 1];
5816 	if (line->annotated)
5817 		goto done;
5818 
5819 	line->id = got_object_id_dup(id);
5820 	if (line->id == NULL) {
5821 		err = got_error_from_errno("got_object_id_dup");
5822 		goto done;
5823 	}
5824 	line->annotated = 1;
5825 done:
5826 	errcode = pthread_mutex_unlock(&tog_mutex);
5827 	if (errcode)
5828 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5829 	return err;
5830 }
5831 
5832 static void *
5833 blame_thread(void *arg)
5834 {
5835 	const struct got_error *err, *close_err;
5836 	struct tog_blame_thread_args *ta = arg;
5837 	struct tog_blame_cb_args *a = ta->cb_args;
5838 	int errcode, fd1 = -1, fd2 = -1;
5839 	FILE *f1 = NULL, *f2 = NULL;
5840 
5841 	fd1 = got_opentempfd();
5842 	if (fd1 == -1)
5843 		return (void *)got_error_from_errno("got_opentempfd");
5844 
5845 	fd2 = got_opentempfd();
5846 	if (fd2 == -1) {
5847 		err = got_error_from_errno("got_opentempfd");
5848 		goto done;
5849 	}
5850 
5851 	f1 = got_opentemp();
5852 	if (f1 == NULL) {
5853 		err = (void *)got_error_from_errno("got_opentemp");
5854 		goto done;
5855 	}
5856 	f2 = got_opentemp();
5857 	if (f2 == NULL) {
5858 		err = (void *)got_error_from_errno("got_opentemp");
5859 		goto done;
5860 	}
5861 
5862 	err = block_signals_used_by_main_thread();
5863 	if (err)
5864 		goto done;
5865 
5866 	err = got_blame(ta->path, a->commit_id, ta->repo,
5867 	    tog_diff_algo, blame_cb, ta->cb_args,
5868 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5869 	if (err && err->code == GOT_ERR_CANCELLED)
5870 		err = NULL;
5871 
5872 	errcode = pthread_mutex_lock(&tog_mutex);
5873 	if (errcode) {
5874 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5875 		goto done;
5876 	}
5877 
5878 	close_err = got_repo_close(ta->repo);
5879 	if (err == NULL)
5880 		err = close_err;
5881 	ta->repo = NULL;
5882 	*ta->complete = 1;
5883 
5884 	errcode = pthread_mutex_unlock(&tog_mutex);
5885 	if (errcode && err == NULL)
5886 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5887 
5888 done:
5889 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5890 		err = got_error_from_errno("close");
5891 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5892 		err = got_error_from_errno("close");
5893 	if (f1 && fclose(f1) == EOF && err == NULL)
5894 		err = got_error_from_errno("fclose");
5895 	if (f2 && fclose(f2) == EOF && err == NULL)
5896 		err = got_error_from_errno("fclose");
5897 
5898 	return (void *)err;
5899 }
5900 
5901 static struct got_object_id *
5902 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5903     int first_displayed_line, int selected_line)
5904 {
5905 	struct tog_blame_line *line;
5906 
5907 	if (nlines <= 0)
5908 		return NULL;
5909 
5910 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5911 	if (!line->annotated)
5912 		return NULL;
5913 
5914 	return line->id;
5915 }
5916 
5917 static struct got_object_id *
5918 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5919     int lineno)
5920 {
5921 	struct tog_blame_line *line;
5922 
5923 	if (nlines <= 0 || lineno >= nlines)
5924 		return NULL;
5925 
5926 	line = &lines[lineno - 1];
5927 	if (!line->annotated)
5928 		return NULL;
5929 
5930 	return line->id;
5931 }
5932 
5933 static const struct got_error *
5934 stop_blame(struct tog_blame *blame)
5935 {
5936 	const struct got_error *err = NULL;
5937 	int i;
5938 
5939 	if (blame->thread) {
5940 		int errcode;
5941 		errcode = pthread_mutex_unlock(&tog_mutex);
5942 		if (errcode)
5943 			return got_error_set_errno(errcode,
5944 			    "pthread_mutex_unlock");
5945 		errcode = pthread_join(blame->thread, (void **)&err);
5946 		if (errcode)
5947 			return got_error_set_errno(errcode, "pthread_join");
5948 		errcode = pthread_mutex_lock(&tog_mutex);
5949 		if (errcode)
5950 			return got_error_set_errno(errcode,
5951 			    "pthread_mutex_lock");
5952 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5953 			err = NULL;
5954 		blame->thread = NULL;
5955 	}
5956 	if (blame->thread_args.repo) {
5957 		const struct got_error *close_err;
5958 		close_err = got_repo_close(blame->thread_args.repo);
5959 		if (err == NULL)
5960 			err = close_err;
5961 		blame->thread_args.repo = NULL;
5962 	}
5963 	if (blame->f) {
5964 		if (fclose(blame->f) == EOF && err == NULL)
5965 			err = got_error_from_errno("fclose");
5966 		blame->f = NULL;
5967 	}
5968 	if (blame->lines) {
5969 		for (i = 0; i < blame->nlines; i++)
5970 			free(blame->lines[i].id);
5971 		free(blame->lines);
5972 		blame->lines = NULL;
5973 	}
5974 	free(blame->cb_args.commit_id);
5975 	blame->cb_args.commit_id = NULL;
5976 	if (blame->pack_fds) {
5977 		const struct got_error *pack_err =
5978 		    got_repo_pack_fds_close(blame->pack_fds);
5979 		if (err == NULL)
5980 			err = pack_err;
5981 		blame->pack_fds = NULL;
5982 	}
5983 	return err;
5984 }
5985 
5986 static const struct got_error *
5987 cancel_blame_view(void *arg)
5988 {
5989 	const struct got_error *err = NULL;
5990 	int *done = arg;
5991 	int errcode;
5992 
5993 	errcode = pthread_mutex_lock(&tog_mutex);
5994 	if (errcode)
5995 		return got_error_set_errno(errcode,
5996 		    "pthread_mutex_unlock");
5997 
5998 	if (*done)
5999 		err = got_error(GOT_ERR_CANCELLED);
6000 
6001 	errcode = pthread_mutex_unlock(&tog_mutex);
6002 	if (errcode)
6003 		return got_error_set_errno(errcode,
6004 		    "pthread_mutex_lock");
6005 
6006 	return err;
6007 }
6008 
6009 static const struct got_error *
6010 run_blame(struct tog_view *view)
6011 {
6012 	struct tog_blame_view_state *s = &view->state.blame;
6013 	struct tog_blame *blame = &s->blame;
6014 	const struct got_error *err = NULL;
6015 	struct got_commit_object *commit = NULL;
6016 	struct got_blob_object *blob = NULL;
6017 	struct got_repository *thread_repo = NULL;
6018 	struct got_object_id *obj_id = NULL;
6019 	int obj_type, fd = -1;
6020 	int *pack_fds = NULL;
6021 
6022 	err = got_object_open_as_commit(&commit, s->repo,
6023 	    &s->blamed_commit->id);
6024 	if (err)
6025 		return err;
6026 
6027 	fd = got_opentempfd();
6028 	if (fd == -1) {
6029 		err = got_error_from_errno("got_opentempfd");
6030 		goto done;
6031 	}
6032 
6033 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6034 	if (err)
6035 		goto done;
6036 
6037 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6038 	if (err)
6039 		goto done;
6040 
6041 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6042 		err = got_error(GOT_ERR_OBJ_TYPE);
6043 		goto done;
6044 	}
6045 
6046 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6047 	if (err)
6048 		goto done;
6049 	blame->f = got_opentemp();
6050 	if (blame->f == NULL) {
6051 		err = got_error_from_errno("got_opentemp");
6052 		goto done;
6053 	}
6054 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6055 	    &blame->line_offsets, blame->f, blob);
6056 	if (err)
6057 		goto done;
6058 	if (blame->nlines == 0) {
6059 		s->blame_complete = 1;
6060 		goto done;
6061 	}
6062 
6063 	/* Don't include \n at EOF in the blame line count. */
6064 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6065 		blame->nlines--;
6066 
6067 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6068 	if (blame->lines == NULL) {
6069 		err = got_error_from_errno("calloc");
6070 		goto done;
6071 	}
6072 
6073 	err = got_repo_pack_fds_open(&pack_fds);
6074 	if (err)
6075 		goto done;
6076 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6077 	    pack_fds);
6078 	if (err)
6079 		goto done;
6080 
6081 	blame->pack_fds = pack_fds;
6082 	blame->cb_args.view = view;
6083 	blame->cb_args.lines = blame->lines;
6084 	blame->cb_args.nlines = blame->nlines;
6085 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6086 	if (blame->cb_args.commit_id == NULL) {
6087 		err = got_error_from_errno("got_object_id_dup");
6088 		goto done;
6089 	}
6090 	blame->cb_args.quit = &s->done;
6091 
6092 	blame->thread_args.path = s->path;
6093 	blame->thread_args.repo = thread_repo;
6094 	blame->thread_args.cb_args = &blame->cb_args;
6095 	blame->thread_args.complete = &s->blame_complete;
6096 	blame->thread_args.cancel_cb = cancel_blame_view;
6097 	blame->thread_args.cancel_arg = &s->done;
6098 	s->blame_complete = 0;
6099 
6100 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6101 		s->first_displayed_line = 1;
6102 		s->last_displayed_line = view->nlines;
6103 		s->selected_line = 1;
6104 	}
6105 	s->matched_line = 0;
6106 
6107 done:
6108 	if (commit)
6109 		got_object_commit_close(commit);
6110 	if (fd != -1 && close(fd) == -1 && err == NULL)
6111 		err = got_error_from_errno("close");
6112 	if (blob)
6113 		got_object_blob_close(blob);
6114 	free(obj_id);
6115 	if (err)
6116 		stop_blame(blame);
6117 	return err;
6118 }
6119 
6120 static const struct got_error *
6121 open_blame_view(struct tog_view *view, char *path,
6122     struct got_object_id *commit_id, struct got_repository *repo)
6123 {
6124 	const struct got_error *err = NULL;
6125 	struct tog_blame_view_state *s = &view->state.blame;
6126 
6127 	STAILQ_INIT(&s->blamed_commits);
6128 
6129 	s->path = strdup(path);
6130 	if (s->path == NULL)
6131 		return got_error_from_errno("strdup");
6132 
6133 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6134 	if (err) {
6135 		free(s->path);
6136 		return err;
6137 	}
6138 
6139 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6140 	s->first_displayed_line = 1;
6141 	s->last_displayed_line = view->nlines;
6142 	s->selected_line = 1;
6143 	s->blame_complete = 0;
6144 	s->repo = repo;
6145 	s->commit_id = commit_id;
6146 	memset(&s->blame, 0, sizeof(s->blame));
6147 
6148 	STAILQ_INIT(&s->colors);
6149 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6150 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6151 		    get_color_value("TOG_COLOR_COMMIT"));
6152 		if (err)
6153 			return err;
6154 	}
6155 
6156 	view->show = show_blame_view;
6157 	view->input = input_blame_view;
6158 	view->reset = reset_blame_view;
6159 	view->close = close_blame_view;
6160 	view->search_start = search_start_blame_view;
6161 	view->search_setup = search_setup_blame_view;
6162 	view->search_next = search_next_view_match;
6163 
6164 	return run_blame(view);
6165 }
6166 
6167 static const struct got_error *
6168 close_blame_view(struct tog_view *view)
6169 {
6170 	const struct got_error *err = NULL;
6171 	struct tog_blame_view_state *s = &view->state.blame;
6172 
6173 	if (s->blame.thread)
6174 		err = stop_blame(&s->blame);
6175 
6176 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6177 		struct got_object_qid *blamed_commit;
6178 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6179 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6180 		got_object_qid_free(blamed_commit);
6181 	}
6182 
6183 	free(s->path);
6184 	free_colors(&s->colors);
6185 	return err;
6186 }
6187 
6188 static const struct got_error *
6189 search_start_blame_view(struct tog_view *view)
6190 {
6191 	struct tog_blame_view_state *s = &view->state.blame;
6192 
6193 	s->matched_line = 0;
6194 	return NULL;
6195 }
6196 
6197 static void
6198 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6199     size_t *nlines, int **first, int **last, int **match, int **selected)
6200 {
6201 	struct tog_blame_view_state *s = &view->state.blame;
6202 
6203 	*f = s->blame.f;
6204 	*nlines = s->blame.nlines;
6205 	*line_offsets = s->blame.line_offsets;
6206 	*match = &s->matched_line;
6207 	*first = &s->first_displayed_line;
6208 	*last = &s->last_displayed_line;
6209 	*selected = &s->selected_line;
6210 }
6211 
6212 static const struct got_error *
6213 show_blame_view(struct tog_view *view)
6214 {
6215 	const struct got_error *err = NULL;
6216 	struct tog_blame_view_state *s = &view->state.blame;
6217 	int errcode;
6218 
6219 	if (s->blame.thread == NULL && !s->blame_complete) {
6220 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6221 		    &s->blame.thread_args);
6222 		if (errcode)
6223 			return got_error_set_errno(errcode, "pthread_create");
6224 
6225 		halfdelay(1); /* fast refresh while annotating  */
6226 	}
6227 
6228 	if (s->blame_complete)
6229 		halfdelay(10); /* disable fast refresh */
6230 
6231 	err = draw_blame(view);
6232 
6233 	view_border(view);
6234 	return err;
6235 }
6236 
6237 static const struct got_error *
6238 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6239     struct got_repository *repo, struct got_object_id *id)
6240 {
6241 	struct tog_view		*log_view;
6242 	const struct got_error	*err = NULL;
6243 
6244 	*new_view = NULL;
6245 
6246 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6247 	if (log_view == NULL)
6248 		return got_error_from_errno("view_open");
6249 
6250 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6251 	if (err)
6252 		view_close(log_view);
6253 	else
6254 		*new_view = log_view;
6255 
6256 	return err;
6257 }
6258 
6259 static const struct got_error *
6260 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6261 {
6262 	const struct got_error *err = NULL, *thread_err = NULL;
6263 	struct tog_view *diff_view;
6264 	struct tog_blame_view_state *s = &view->state.blame;
6265 	int eos, nscroll, begin_y = 0, begin_x = 0;
6266 
6267 	eos = nscroll = view->nlines - 2;
6268 	if (view_is_hsplit_top(view))
6269 		--eos;  /* border */
6270 
6271 	switch (ch) {
6272 	case '0':
6273 		view->x = 0;
6274 		break;
6275 	case '$':
6276 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6277 		view->count = 0;
6278 		break;
6279 	case KEY_RIGHT:
6280 	case 'l':
6281 		if (view->x + view->ncols / 3 < view->maxx)
6282 			view->x += 2;  /* move two columns right */
6283 		else
6284 			view->count = 0;
6285 		break;
6286 	case KEY_LEFT:
6287 	case 'h':
6288 		view->x -= MIN(view->x, 2);  /* move two columns back */
6289 		if (view->x <= 0)
6290 			view->count = 0;
6291 		break;
6292 	case 'q':
6293 		s->done = 1;
6294 		break;
6295 	case 'g':
6296 	case KEY_HOME:
6297 		s->selected_line = 1;
6298 		s->first_displayed_line = 1;
6299 		view->count = 0;
6300 		break;
6301 	case 'G':
6302 	case KEY_END:
6303 		if (s->blame.nlines < eos) {
6304 			s->selected_line = s->blame.nlines;
6305 			s->first_displayed_line = 1;
6306 		} else {
6307 			s->selected_line = eos;
6308 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6309 		}
6310 		view->count = 0;
6311 		break;
6312 	case 'k':
6313 	case KEY_UP:
6314 	case CTRL('p'):
6315 		if (s->selected_line > 1)
6316 			s->selected_line--;
6317 		else if (s->selected_line == 1 &&
6318 		    s->first_displayed_line > 1)
6319 			s->first_displayed_line--;
6320 		else
6321 			view->count = 0;
6322 		break;
6323 	case CTRL('u'):
6324 	case 'u':
6325 		nscroll /= 2;
6326 		/* FALL THROUGH */
6327 	case KEY_PPAGE:
6328 	case CTRL('b'):
6329 	case 'b':
6330 		if (s->first_displayed_line == 1) {
6331 			if (view->count > 1)
6332 				nscroll += nscroll;
6333 			s->selected_line = MAX(1, s->selected_line - nscroll);
6334 			view->count = 0;
6335 			break;
6336 		}
6337 		if (s->first_displayed_line > nscroll)
6338 			s->first_displayed_line -= nscroll;
6339 		else
6340 			s->first_displayed_line = 1;
6341 		break;
6342 	case 'j':
6343 	case KEY_DOWN:
6344 	case CTRL('n'):
6345 		if (s->selected_line < eos && s->first_displayed_line +
6346 		    s->selected_line <= s->blame.nlines)
6347 			s->selected_line++;
6348 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6349 			s->first_displayed_line++;
6350 		else
6351 			view->count = 0;
6352 		break;
6353 	case 'c':
6354 	case 'p': {
6355 		struct got_object_id *id = NULL;
6356 
6357 		view->count = 0;
6358 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6359 		    s->first_displayed_line, s->selected_line);
6360 		if (id == NULL)
6361 			break;
6362 		if (ch == 'p') {
6363 			struct got_commit_object *commit, *pcommit;
6364 			struct got_object_qid *pid;
6365 			struct got_object_id *blob_id = NULL;
6366 			int obj_type;
6367 			err = got_object_open_as_commit(&commit,
6368 			    s->repo, id);
6369 			if (err)
6370 				break;
6371 			pid = STAILQ_FIRST(
6372 			    got_object_commit_get_parent_ids(commit));
6373 			if (pid == NULL) {
6374 				got_object_commit_close(commit);
6375 				break;
6376 			}
6377 			/* Check if path history ends here. */
6378 			err = got_object_open_as_commit(&pcommit,
6379 			    s->repo, &pid->id);
6380 			if (err)
6381 				break;
6382 			err = got_object_id_by_path(&blob_id, s->repo,
6383 			    pcommit, s->path);
6384 			got_object_commit_close(pcommit);
6385 			if (err) {
6386 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6387 					err = NULL;
6388 				got_object_commit_close(commit);
6389 				break;
6390 			}
6391 			err = got_object_get_type(&obj_type, s->repo,
6392 			    blob_id);
6393 			free(blob_id);
6394 			/* Can't blame non-blob type objects. */
6395 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6396 				got_object_commit_close(commit);
6397 				break;
6398 			}
6399 			err = got_object_qid_alloc(&s->blamed_commit,
6400 			    &pid->id);
6401 			got_object_commit_close(commit);
6402 		} else {
6403 			if (got_object_id_cmp(id,
6404 			    &s->blamed_commit->id) == 0)
6405 				break;
6406 			err = got_object_qid_alloc(&s->blamed_commit,
6407 			    id);
6408 		}
6409 		if (err)
6410 			break;
6411 		s->done = 1;
6412 		thread_err = stop_blame(&s->blame);
6413 		s->done = 0;
6414 		if (thread_err)
6415 			break;
6416 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6417 		    s->blamed_commit, entry);
6418 		err = run_blame(view);
6419 		if (err)
6420 			break;
6421 		break;
6422 	}
6423 	case 'C': {
6424 		struct got_object_qid *first;
6425 
6426 		view->count = 0;
6427 		first = STAILQ_FIRST(&s->blamed_commits);
6428 		if (!got_object_id_cmp(&first->id, s->commit_id))
6429 			break;
6430 		s->done = 1;
6431 		thread_err = stop_blame(&s->blame);
6432 		s->done = 0;
6433 		if (thread_err)
6434 			break;
6435 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6436 		got_object_qid_free(s->blamed_commit);
6437 		s->blamed_commit =
6438 		    STAILQ_FIRST(&s->blamed_commits);
6439 		err = run_blame(view);
6440 		if (err)
6441 			break;
6442 		break;
6443 	}
6444 	case 'L':
6445 		view->count = 0;
6446 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6447 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6448 		if (s->id_to_log)
6449 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6450 		break;
6451 	case KEY_ENTER:
6452 	case '\r': {
6453 		struct got_object_id *id = NULL;
6454 		struct got_object_qid *pid;
6455 		struct got_commit_object *commit = NULL;
6456 
6457 		view->count = 0;
6458 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6459 		    s->first_displayed_line, s->selected_line);
6460 		if (id == NULL)
6461 			break;
6462 		err = got_object_open_as_commit(&commit, s->repo, id);
6463 		if (err)
6464 			break;
6465 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6466 		if (*new_view) {
6467 			/* traversed from diff view, release diff resources  */
6468 			err = close_diff_view(*new_view);
6469 			if (err)
6470 				break;
6471 			diff_view = *new_view;
6472 		} else {
6473 			if (view_is_parent_view(view))
6474 				view_get_split(view, &begin_y, &begin_x);
6475 
6476 			diff_view = view_open(0, 0, begin_y, begin_x,
6477 			    TOG_VIEW_DIFF);
6478 			if (diff_view == NULL) {
6479 				got_object_commit_close(commit);
6480 				err = got_error_from_errno("view_open");
6481 				break;
6482 			}
6483 		}
6484 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6485 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6486 		got_object_commit_close(commit);
6487 		if (err) {
6488 			view_close(diff_view);
6489 			break;
6490 		}
6491 		s->last_diffed_line = s->first_displayed_line - 1 +
6492 		    s->selected_line;
6493 		if (*new_view)
6494 			break;	/* still open from active diff view */
6495 		if (view_is_parent_view(view) &&
6496 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6497 			err = view_init_hsplit(view, begin_y);
6498 			if (err)
6499 				break;
6500 		}
6501 
6502 		view->focussed = 0;
6503 		diff_view->focussed = 1;
6504 		diff_view->mode = view->mode;
6505 		diff_view->nlines = view->lines - begin_y;
6506 		if (view_is_parent_view(view)) {
6507 			view_transfer_size(diff_view, view);
6508 			err = view_close_child(view);
6509 			if (err)
6510 				break;
6511 			err = view_set_child(view, diff_view);
6512 			if (err)
6513 				break;
6514 			view->focus_child = 1;
6515 		} else
6516 			*new_view = diff_view;
6517 		if (err)
6518 			break;
6519 		break;
6520 	}
6521 	case CTRL('d'):
6522 	case 'd':
6523 		nscroll /= 2;
6524 		/* FALL THROUGH */
6525 	case KEY_NPAGE:
6526 	case CTRL('f'):
6527 	case 'f':
6528 	case ' ':
6529 		if (s->last_displayed_line >= s->blame.nlines &&
6530 		    s->selected_line >= MIN(s->blame.nlines,
6531 		    view->nlines - 2)) {
6532 			view->count = 0;
6533 			break;
6534 		}
6535 		if (s->last_displayed_line >= s->blame.nlines &&
6536 		    s->selected_line < view->nlines - 2) {
6537 			s->selected_line +=
6538 			    MIN(nscroll, s->last_displayed_line -
6539 			    s->first_displayed_line - s->selected_line + 1);
6540 		}
6541 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6542 			s->first_displayed_line += nscroll;
6543 		else
6544 			s->first_displayed_line =
6545 			    s->blame.nlines - (view->nlines - 3);
6546 		break;
6547 	case KEY_RESIZE:
6548 		if (s->selected_line > view->nlines - 2) {
6549 			s->selected_line = MIN(s->blame.nlines,
6550 			    view->nlines - 2);
6551 		}
6552 		break;
6553 	default:
6554 		view->count = 0;
6555 		break;
6556 	}
6557 	return thread_err ? thread_err : err;
6558 }
6559 
6560 static const struct got_error *
6561 reset_blame_view(struct tog_view *view)
6562 {
6563 	const struct got_error *err;
6564 	struct tog_blame_view_state *s = &view->state.blame;
6565 
6566 	view->count = 0;
6567 	s->done = 1;
6568 	err = stop_blame(&s->blame);
6569 	s->done = 0;
6570 	if (err)
6571 		return err;
6572 	return run_blame(view);
6573 }
6574 
6575 static const struct got_error *
6576 cmd_blame(int argc, char *argv[])
6577 {
6578 	const struct got_error *error;
6579 	struct got_repository *repo = NULL;
6580 	struct got_worktree *worktree = NULL;
6581 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6582 	char *link_target = NULL;
6583 	struct got_object_id *commit_id = NULL;
6584 	struct got_commit_object *commit = NULL;
6585 	char *commit_id_str = NULL;
6586 	int ch;
6587 	struct tog_view *view;
6588 	int *pack_fds = NULL;
6589 
6590 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6591 		switch (ch) {
6592 		case 'c':
6593 			commit_id_str = optarg;
6594 			break;
6595 		case 'r':
6596 			repo_path = realpath(optarg, NULL);
6597 			if (repo_path == NULL)
6598 				return got_error_from_errno2("realpath",
6599 				    optarg);
6600 			break;
6601 		default:
6602 			usage_blame();
6603 			/* NOTREACHED */
6604 		}
6605 	}
6606 
6607 	argc -= optind;
6608 	argv += optind;
6609 
6610 	if (argc != 1)
6611 		usage_blame();
6612 
6613 	error = got_repo_pack_fds_open(&pack_fds);
6614 	if (error != NULL)
6615 		goto done;
6616 
6617 	if (repo_path == NULL) {
6618 		cwd = getcwd(NULL, 0);
6619 		if (cwd == NULL)
6620 			return got_error_from_errno("getcwd");
6621 		error = got_worktree_open(&worktree, cwd);
6622 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6623 			goto done;
6624 		if (worktree)
6625 			repo_path =
6626 			    strdup(got_worktree_get_repo_path(worktree));
6627 		else
6628 			repo_path = strdup(cwd);
6629 		if (repo_path == NULL) {
6630 			error = got_error_from_errno("strdup");
6631 			goto done;
6632 		}
6633 	}
6634 
6635 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6636 	if (error != NULL)
6637 		goto done;
6638 
6639 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6640 	    worktree);
6641 	if (error)
6642 		goto done;
6643 
6644 	init_curses();
6645 
6646 	error = apply_unveil(got_repo_get_path(repo), NULL);
6647 	if (error)
6648 		goto done;
6649 
6650 	error = tog_load_refs(repo, 0);
6651 	if (error)
6652 		goto done;
6653 
6654 	if (commit_id_str == NULL) {
6655 		struct got_reference *head_ref;
6656 		error = got_ref_open(&head_ref, repo, worktree ?
6657 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6658 		if (error != NULL)
6659 			goto done;
6660 		error = got_ref_resolve(&commit_id, repo, head_ref);
6661 		got_ref_close(head_ref);
6662 	} else {
6663 		error = got_repo_match_object_id(&commit_id, NULL,
6664 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6665 	}
6666 	if (error != NULL)
6667 		goto done;
6668 
6669 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6670 	if (view == NULL) {
6671 		error = got_error_from_errno("view_open");
6672 		goto done;
6673 	}
6674 
6675 	error = got_object_open_as_commit(&commit, repo, commit_id);
6676 	if (error)
6677 		goto done;
6678 
6679 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6680 	    commit, repo);
6681 	if (error)
6682 		goto done;
6683 
6684 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6685 	    commit_id, repo);
6686 	if (error)
6687 		goto done;
6688 	if (worktree) {
6689 		/* Release work tree lock. */
6690 		got_worktree_close(worktree);
6691 		worktree = NULL;
6692 	}
6693 	error = view_loop(view);
6694 done:
6695 	free(repo_path);
6696 	free(in_repo_path);
6697 	free(link_target);
6698 	free(cwd);
6699 	free(commit_id);
6700 	if (commit)
6701 		got_object_commit_close(commit);
6702 	if (worktree)
6703 		got_worktree_close(worktree);
6704 	if (repo) {
6705 		const struct got_error *close_err = got_repo_close(repo);
6706 		if (error == NULL)
6707 			error = close_err;
6708 	}
6709 	if (pack_fds) {
6710 		const struct got_error *pack_err =
6711 		    got_repo_pack_fds_close(pack_fds);
6712 		if (error == NULL)
6713 			error = pack_err;
6714 	}
6715 	tog_free_refs();
6716 	return error;
6717 }
6718 
6719 static const struct got_error *
6720 draw_tree_entries(struct tog_view *view, const char *parent_path)
6721 {
6722 	struct tog_tree_view_state *s = &view->state.tree;
6723 	const struct got_error *err = NULL;
6724 	struct got_tree_entry *te;
6725 	wchar_t *wline;
6726 	char *index = NULL;
6727 	struct tog_color *tc;
6728 	int width, n, nentries, i = 1;
6729 	int limit = view->nlines;
6730 
6731 	s->ndisplayed = 0;
6732 	if (view_is_hsplit_top(view))
6733 		--limit;  /* border */
6734 
6735 	werase(view->window);
6736 
6737 	if (limit == 0)
6738 		return NULL;
6739 
6740 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6741 	    0, 0);
6742 	if (err)
6743 		return err;
6744 	if (view_needs_focus_indication(view))
6745 		wstandout(view->window);
6746 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6747 	if (tc)
6748 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6749 	waddwstr(view->window, wline);
6750 	free(wline);
6751 	wline = NULL;
6752 	while (width++ < view->ncols)
6753 		waddch(view->window, ' ');
6754 	if (tc)
6755 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6756 	if (view_needs_focus_indication(view))
6757 		wstandend(view->window);
6758 	if (--limit <= 0)
6759 		return NULL;
6760 
6761 	i += s->selected;
6762 	if (s->first_displayed_entry) {
6763 		i += got_tree_entry_get_index(s->first_displayed_entry);
6764 		if (s->tree != s->root)
6765 			++i;  /* account for ".." entry */
6766 	}
6767 	nentries = got_object_tree_get_nentries(s->tree);
6768 	if (asprintf(&index, "[%d/%d] %s",
6769 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6770 		return got_error_from_errno("asprintf");
6771 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6772 	free(index);
6773 	if (err)
6774 		return err;
6775 	waddwstr(view->window, wline);
6776 	free(wline);
6777 	wline = NULL;
6778 	if (width < view->ncols - 1)
6779 		waddch(view->window, '\n');
6780 	if (--limit <= 0)
6781 		return NULL;
6782 	waddch(view->window, '\n');
6783 	if (--limit <= 0)
6784 		return NULL;
6785 
6786 	if (s->first_displayed_entry == NULL) {
6787 		te = got_object_tree_get_first_entry(s->tree);
6788 		if (s->selected == 0) {
6789 			if (view->focussed)
6790 				wstandout(view->window);
6791 			s->selected_entry = NULL;
6792 		}
6793 		waddstr(view->window, "  ..\n");	/* parent directory */
6794 		if (s->selected == 0 && view->focussed)
6795 			wstandend(view->window);
6796 		s->ndisplayed++;
6797 		if (--limit <= 0)
6798 			return NULL;
6799 		n = 1;
6800 	} else {
6801 		n = 0;
6802 		te = s->first_displayed_entry;
6803 	}
6804 
6805 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6806 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6807 		const char *modestr = "";
6808 		mode_t mode;
6809 
6810 		te = got_object_tree_get_entry(s->tree, i);
6811 		mode = got_tree_entry_get_mode(te);
6812 
6813 		if (s->show_ids) {
6814 			err = got_object_id_str(&id_str,
6815 			    got_tree_entry_get_id(te));
6816 			if (err)
6817 				return got_error_from_errno(
6818 				    "got_object_id_str");
6819 		}
6820 		if (got_object_tree_entry_is_submodule(te))
6821 			modestr = "$";
6822 		else if (S_ISLNK(mode)) {
6823 			int i;
6824 
6825 			err = got_tree_entry_get_symlink_target(&link_target,
6826 			    te, s->repo);
6827 			if (err) {
6828 				free(id_str);
6829 				return err;
6830 			}
6831 			for (i = 0; i < strlen(link_target); i++) {
6832 				if (!isprint((unsigned char)link_target[i]))
6833 					link_target[i] = '?';
6834 			}
6835 			modestr = "@";
6836 		}
6837 		else if (S_ISDIR(mode))
6838 			modestr = "/";
6839 		else if (mode & S_IXUSR)
6840 			modestr = "*";
6841 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6842 		    got_tree_entry_get_name(te), modestr,
6843 		    link_target ? " -> ": "",
6844 		    link_target ? link_target : "") == -1) {
6845 			free(id_str);
6846 			free(link_target);
6847 			return got_error_from_errno("asprintf");
6848 		}
6849 		free(id_str);
6850 		free(link_target);
6851 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6852 		    0, 0);
6853 		if (err) {
6854 			free(line);
6855 			break;
6856 		}
6857 		if (n == s->selected) {
6858 			if (view->focussed)
6859 				wstandout(view->window);
6860 			s->selected_entry = te;
6861 		}
6862 		tc = match_color(&s->colors, line);
6863 		if (tc)
6864 			wattr_on(view->window,
6865 			    COLOR_PAIR(tc->colorpair), NULL);
6866 		waddwstr(view->window, wline);
6867 		if (tc)
6868 			wattr_off(view->window,
6869 			    COLOR_PAIR(tc->colorpair), NULL);
6870 		if (width < view->ncols - 1)
6871 			waddch(view->window, '\n');
6872 		if (n == s->selected && view->focussed)
6873 			wstandend(view->window);
6874 		free(line);
6875 		free(wline);
6876 		wline = NULL;
6877 		n++;
6878 		s->ndisplayed++;
6879 		s->last_displayed_entry = te;
6880 		if (--limit <= 0)
6881 			break;
6882 	}
6883 
6884 	return err;
6885 }
6886 
6887 static void
6888 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6889 {
6890 	struct got_tree_entry *te;
6891 	int isroot = s->tree == s->root;
6892 	int i = 0;
6893 
6894 	if (s->first_displayed_entry == NULL)
6895 		return;
6896 
6897 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6898 	while (i++ < maxscroll) {
6899 		if (te == NULL) {
6900 			if (!isroot)
6901 				s->first_displayed_entry = NULL;
6902 			break;
6903 		}
6904 		s->first_displayed_entry = te;
6905 		te = got_tree_entry_get_prev(s->tree, te);
6906 	}
6907 }
6908 
6909 static const struct got_error *
6910 tree_scroll_down(struct tog_view *view, int maxscroll)
6911 {
6912 	struct tog_tree_view_state *s = &view->state.tree;
6913 	struct got_tree_entry *next, *last;
6914 	int n = 0;
6915 
6916 	if (s->first_displayed_entry)
6917 		next = got_tree_entry_get_next(s->tree,
6918 		    s->first_displayed_entry);
6919 	else
6920 		next = got_object_tree_get_first_entry(s->tree);
6921 
6922 	last = s->last_displayed_entry;
6923 	while (next && n++ < maxscroll) {
6924 		if (last) {
6925 			s->last_displayed_entry = last;
6926 			last = got_tree_entry_get_next(s->tree, last);
6927 		}
6928 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6929 			s->first_displayed_entry = next;
6930 			next = got_tree_entry_get_next(s->tree, next);
6931 		}
6932 	}
6933 
6934 	return NULL;
6935 }
6936 
6937 static const struct got_error *
6938 tree_entry_path(char **path, struct tog_parent_trees *parents,
6939     struct got_tree_entry *te)
6940 {
6941 	const struct got_error *err = NULL;
6942 	struct tog_parent_tree *pt;
6943 	size_t len = 2; /* for leading slash and NUL */
6944 
6945 	TAILQ_FOREACH(pt, parents, entry)
6946 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6947 		    + 1 /* slash */;
6948 	if (te)
6949 		len += strlen(got_tree_entry_get_name(te));
6950 
6951 	*path = calloc(1, len);
6952 	if (path == NULL)
6953 		return got_error_from_errno("calloc");
6954 
6955 	(*path)[0] = '/';
6956 	pt = TAILQ_LAST(parents, tog_parent_trees);
6957 	while (pt) {
6958 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6959 		if (strlcat(*path, name, len) >= len) {
6960 			err = got_error(GOT_ERR_NO_SPACE);
6961 			goto done;
6962 		}
6963 		if (strlcat(*path, "/", len) >= len) {
6964 			err = got_error(GOT_ERR_NO_SPACE);
6965 			goto done;
6966 		}
6967 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6968 	}
6969 	if (te) {
6970 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6971 			err = got_error(GOT_ERR_NO_SPACE);
6972 			goto done;
6973 		}
6974 	}
6975 done:
6976 	if (err) {
6977 		free(*path);
6978 		*path = NULL;
6979 	}
6980 	return err;
6981 }
6982 
6983 static const struct got_error *
6984 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6985     struct got_tree_entry *te, struct tog_parent_trees *parents,
6986     struct got_object_id *commit_id, struct got_repository *repo)
6987 {
6988 	const struct got_error *err = NULL;
6989 	char *path;
6990 	struct tog_view *blame_view;
6991 
6992 	*new_view = NULL;
6993 
6994 	err = tree_entry_path(&path, parents, te);
6995 	if (err)
6996 		return err;
6997 
6998 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6999 	if (blame_view == NULL) {
7000 		err = got_error_from_errno("view_open");
7001 		goto done;
7002 	}
7003 
7004 	err = open_blame_view(blame_view, path, commit_id, repo);
7005 	if (err) {
7006 		if (err->code == GOT_ERR_CANCELLED)
7007 			err = NULL;
7008 		view_close(blame_view);
7009 	} else
7010 		*new_view = blame_view;
7011 done:
7012 	free(path);
7013 	return err;
7014 }
7015 
7016 static const struct got_error *
7017 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7018     struct tog_tree_view_state *s)
7019 {
7020 	struct tog_view *log_view;
7021 	const struct got_error *err = NULL;
7022 	char *path;
7023 
7024 	*new_view = NULL;
7025 
7026 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7027 	if (log_view == NULL)
7028 		return got_error_from_errno("view_open");
7029 
7030 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7031 	if (err)
7032 		return err;
7033 
7034 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7035 	    path, 0);
7036 	if (err)
7037 		view_close(log_view);
7038 	else
7039 		*new_view = log_view;
7040 	free(path);
7041 	return err;
7042 }
7043 
7044 static const struct got_error *
7045 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7046     const char *head_ref_name, struct got_repository *repo)
7047 {
7048 	const struct got_error *err = NULL;
7049 	char *commit_id_str = NULL;
7050 	struct tog_tree_view_state *s = &view->state.tree;
7051 	struct got_commit_object *commit = NULL;
7052 
7053 	TAILQ_INIT(&s->parents);
7054 	STAILQ_INIT(&s->colors);
7055 
7056 	s->commit_id = got_object_id_dup(commit_id);
7057 	if (s->commit_id == NULL)
7058 		return got_error_from_errno("got_object_id_dup");
7059 
7060 	err = got_object_open_as_commit(&commit, repo, commit_id);
7061 	if (err)
7062 		goto done;
7063 
7064 	/*
7065 	 * The root is opened here and will be closed when the view is closed.
7066 	 * Any visited subtrees and their path-wise parents are opened and
7067 	 * closed on demand.
7068 	 */
7069 	err = got_object_open_as_tree(&s->root, repo,
7070 	    got_object_commit_get_tree_id(commit));
7071 	if (err)
7072 		goto done;
7073 	s->tree = s->root;
7074 
7075 	err = got_object_id_str(&commit_id_str, commit_id);
7076 	if (err != NULL)
7077 		goto done;
7078 
7079 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7080 		err = got_error_from_errno("asprintf");
7081 		goto done;
7082 	}
7083 
7084 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7085 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7086 	if (head_ref_name) {
7087 		s->head_ref_name = strdup(head_ref_name);
7088 		if (s->head_ref_name == NULL) {
7089 			err = got_error_from_errno("strdup");
7090 			goto done;
7091 		}
7092 	}
7093 	s->repo = repo;
7094 
7095 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7096 		err = add_color(&s->colors, "\\$$",
7097 		    TOG_COLOR_TREE_SUBMODULE,
7098 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7099 		if (err)
7100 			goto done;
7101 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7102 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7103 		if (err)
7104 			goto done;
7105 		err = add_color(&s->colors, "/$",
7106 		    TOG_COLOR_TREE_DIRECTORY,
7107 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7108 		if (err)
7109 			goto done;
7110 
7111 		err = add_color(&s->colors, "\\*$",
7112 		    TOG_COLOR_TREE_EXECUTABLE,
7113 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7114 		if (err)
7115 			goto done;
7116 
7117 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7118 		    get_color_value("TOG_COLOR_COMMIT"));
7119 		if (err)
7120 			goto done;
7121 	}
7122 
7123 	view->show = show_tree_view;
7124 	view->input = input_tree_view;
7125 	view->close = close_tree_view;
7126 	view->search_start = search_start_tree_view;
7127 	view->search_next = search_next_tree_view;
7128 done:
7129 	free(commit_id_str);
7130 	if (commit)
7131 		got_object_commit_close(commit);
7132 	if (err)
7133 		close_tree_view(view);
7134 	return err;
7135 }
7136 
7137 static const struct got_error *
7138 close_tree_view(struct tog_view *view)
7139 {
7140 	struct tog_tree_view_state *s = &view->state.tree;
7141 
7142 	free_colors(&s->colors);
7143 	free(s->tree_label);
7144 	s->tree_label = NULL;
7145 	free(s->commit_id);
7146 	s->commit_id = NULL;
7147 	free(s->head_ref_name);
7148 	s->head_ref_name = NULL;
7149 	while (!TAILQ_EMPTY(&s->parents)) {
7150 		struct tog_parent_tree *parent;
7151 		parent = TAILQ_FIRST(&s->parents);
7152 		TAILQ_REMOVE(&s->parents, parent, entry);
7153 		if (parent->tree != s->root)
7154 			got_object_tree_close(parent->tree);
7155 		free(parent);
7156 
7157 	}
7158 	if (s->tree != NULL && s->tree != s->root)
7159 		got_object_tree_close(s->tree);
7160 	if (s->root)
7161 		got_object_tree_close(s->root);
7162 	return NULL;
7163 }
7164 
7165 static const struct got_error *
7166 search_start_tree_view(struct tog_view *view)
7167 {
7168 	struct tog_tree_view_state *s = &view->state.tree;
7169 
7170 	s->matched_entry = NULL;
7171 	return NULL;
7172 }
7173 
7174 static int
7175 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7176 {
7177 	regmatch_t regmatch;
7178 
7179 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7180 	    0) == 0;
7181 }
7182 
7183 static const struct got_error *
7184 search_next_tree_view(struct tog_view *view)
7185 {
7186 	struct tog_tree_view_state *s = &view->state.tree;
7187 	struct got_tree_entry *te = NULL;
7188 
7189 	if (!view->searching) {
7190 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7191 		return NULL;
7192 	}
7193 
7194 	if (s->matched_entry) {
7195 		if (view->searching == TOG_SEARCH_FORWARD) {
7196 			if (s->selected_entry)
7197 				te = got_tree_entry_get_next(s->tree,
7198 				    s->selected_entry);
7199 			else
7200 				te = got_object_tree_get_first_entry(s->tree);
7201 		} else {
7202 			if (s->selected_entry == NULL)
7203 				te = got_object_tree_get_last_entry(s->tree);
7204 			else
7205 				te = got_tree_entry_get_prev(s->tree,
7206 				    s->selected_entry);
7207 		}
7208 	} else {
7209 		if (s->selected_entry)
7210 			te = s->selected_entry;
7211 		else if (view->searching == TOG_SEARCH_FORWARD)
7212 			te = got_object_tree_get_first_entry(s->tree);
7213 		else
7214 			te = got_object_tree_get_last_entry(s->tree);
7215 	}
7216 
7217 	while (1) {
7218 		if (te == NULL) {
7219 			if (s->matched_entry == NULL) {
7220 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7221 				return NULL;
7222 			}
7223 			if (view->searching == TOG_SEARCH_FORWARD)
7224 				te = got_object_tree_get_first_entry(s->tree);
7225 			else
7226 				te = got_object_tree_get_last_entry(s->tree);
7227 		}
7228 
7229 		if (match_tree_entry(te, &view->regex)) {
7230 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7231 			s->matched_entry = te;
7232 			break;
7233 		}
7234 
7235 		if (view->searching == TOG_SEARCH_FORWARD)
7236 			te = got_tree_entry_get_next(s->tree, te);
7237 		else
7238 			te = got_tree_entry_get_prev(s->tree, te);
7239 	}
7240 
7241 	if (s->matched_entry) {
7242 		s->first_displayed_entry = s->matched_entry;
7243 		s->selected = 0;
7244 	}
7245 
7246 	return NULL;
7247 }
7248 
7249 static const struct got_error *
7250 show_tree_view(struct tog_view *view)
7251 {
7252 	const struct got_error *err = NULL;
7253 	struct tog_tree_view_state *s = &view->state.tree;
7254 	char *parent_path;
7255 
7256 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7257 	if (err)
7258 		return err;
7259 
7260 	err = draw_tree_entries(view, parent_path);
7261 	free(parent_path);
7262 
7263 	view_border(view);
7264 	return err;
7265 }
7266 
7267 static const struct got_error *
7268 tree_goto_line(struct tog_view *view, int nlines)
7269 {
7270 	const struct got_error		 *err = NULL;
7271 	struct tog_tree_view_state	 *s = &view->state.tree;
7272 	struct got_tree_entry		**fte, **lte, **ste;
7273 	int				  g, last, first = 1, i = 1;
7274 	int				  root = s->tree == s->root;
7275 	int				  off = root ? 1 : 2;
7276 
7277 	g = view->gline;
7278 	view->gline = 0;
7279 
7280 	if (g == 0)
7281 		g = 1;
7282 	else if (g > got_object_tree_get_nentries(s->tree))
7283 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7284 
7285 	fte = &s->first_displayed_entry;
7286 	lte = &s->last_displayed_entry;
7287 	ste = &s->selected_entry;
7288 
7289 	if (*fte != NULL) {
7290 		first = got_tree_entry_get_index(*fte);
7291 		first += off;  /* account for ".." */
7292 	}
7293 	last = got_tree_entry_get_index(*lte);
7294 	last += off;
7295 
7296 	if (g >= first && g <= last && g - first < nlines) {
7297 		s->selected = g - first;
7298 		return NULL;	/* gline is on the current page */
7299 	}
7300 
7301 	if (*ste != NULL) {
7302 		i = got_tree_entry_get_index(*ste);
7303 		i += off;
7304 	}
7305 
7306 	if (i < g) {
7307 		err = tree_scroll_down(view, g - i);
7308 		if (err)
7309 			return err;
7310 		if (got_tree_entry_get_index(*lte) >=
7311 		    got_object_tree_get_nentries(s->tree) - 1 &&
7312 		    first + s->selected < g &&
7313 		    s->selected < s->ndisplayed - 1) {
7314 			first = got_tree_entry_get_index(*fte);
7315 			first += off;
7316 			s->selected = g - first;
7317 		}
7318 	} else if (i > g)
7319 		tree_scroll_up(s, i - g);
7320 
7321 	if (g < nlines &&
7322 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7323 		s->selected = g - 1;
7324 
7325 	return NULL;
7326 }
7327 
7328 static const struct got_error *
7329 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7330 {
7331 	const struct got_error *err = NULL;
7332 	struct tog_tree_view_state *s = &view->state.tree;
7333 	struct got_tree_entry *te;
7334 	int n, nscroll = view->nlines - 3;
7335 
7336 	if (view->gline)
7337 		return tree_goto_line(view, nscroll);
7338 
7339 	switch (ch) {
7340 	case 'i':
7341 		s->show_ids = !s->show_ids;
7342 		view->count = 0;
7343 		break;
7344 	case 'L':
7345 		view->count = 0;
7346 		if (!s->selected_entry)
7347 			break;
7348 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7349 		break;
7350 	case 'R':
7351 		view->count = 0;
7352 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7353 		break;
7354 	case 'g':
7355 	case '=':
7356 	case KEY_HOME:
7357 		s->selected = 0;
7358 		view->count = 0;
7359 		if (s->tree == s->root)
7360 			s->first_displayed_entry =
7361 			    got_object_tree_get_first_entry(s->tree);
7362 		else
7363 			s->first_displayed_entry = NULL;
7364 		break;
7365 	case 'G':
7366 	case '*':
7367 	case KEY_END: {
7368 		int eos = view->nlines - 3;
7369 
7370 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7371 			--eos;  /* border */
7372 		s->selected = 0;
7373 		view->count = 0;
7374 		te = got_object_tree_get_last_entry(s->tree);
7375 		for (n = 0; n < eos; n++) {
7376 			if (te == NULL) {
7377 				if (s->tree != s->root) {
7378 					s->first_displayed_entry = NULL;
7379 					n++;
7380 				}
7381 				break;
7382 			}
7383 			s->first_displayed_entry = te;
7384 			te = got_tree_entry_get_prev(s->tree, te);
7385 		}
7386 		if (n > 0)
7387 			s->selected = n - 1;
7388 		break;
7389 	}
7390 	case 'k':
7391 	case KEY_UP:
7392 	case CTRL('p'):
7393 		if (s->selected > 0) {
7394 			s->selected--;
7395 			break;
7396 		}
7397 		tree_scroll_up(s, 1);
7398 		if (s->selected_entry == NULL ||
7399 		    (s->tree == s->root && s->selected_entry ==
7400 		     got_object_tree_get_first_entry(s->tree)))
7401 			view->count = 0;
7402 		break;
7403 	case CTRL('u'):
7404 	case 'u':
7405 		nscroll /= 2;
7406 		/* FALL THROUGH */
7407 	case KEY_PPAGE:
7408 	case CTRL('b'):
7409 	case 'b':
7410 		if (s->tree == s->root) {
7411 			if (got_object_tree_get_first_entry(s->tree) ==
7412 			    s->first_displayed_entry)
7413 				s->selected -= MIN(s->selected, nscroll);
7414 		} else {
7415 			if (s->first_displayed_entry == NULL)
7416 				s->selected -= MIN(s->selected, nscroll);
7417 		}
7418 		tree_scroll_up(s, MAX(0, nscroll));
7419 		if (s->selected_entry == NULL ||
7420 		    (s->tree == s->root && s->selected_entry ==
7421 		     got_object_tree_get_first_entry(s->tree)))
7422 			view->count = 0;
7423 		break;
7424 	case 'j':
7425 	case KEY_DOWN:
7426 	case CTRL('n'):
7427 		if (s->selected < s->ndisplayed - 1) {
7428 			s->selected++;
7429 			break;
7430 		}
7431 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7432 		    == NULL) {
7433 			/* can't scroll any further */
7434 			view->count = 0;
7435 			break;
7436 		}
7437 		tree_scroll_down(view, 1);
7438 		break;
7439 	case CTRL('d'):
7440 	case 'd':
7441 		nscroll /= 2;
7442 		/* FALL THROUGH */
7443 	case KEY_NPAGE:
7444 	case CTRL('f'):
7445 	case 'f':
7446 	case ' ':
7447 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7448 		    == NULL) {
7449 			/* can't scroll any further; move cursor down */
7450 			if (s->selected < s->ndisplayed - 1)
7451 				s->selected += MIN(nscroll,
7452 				    s->ndisplayed - s->selected - 1);
7453 			else
7454 				view->count = 0;
7455 			break;
7456 		}
7457 		tree_scroll_down(view, nscroll);
7458 		break;
7459 	case KEY_ENTER:
7460 	case '\r':
7461 	case KEY_BACKSPACE:
7462 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7463 			struct tog_parent_tree *parent;
7464 			/* user selected '..' */
7465 			if (s->tree == s->root) {
7466 				view->count = 0;
7467 				break;
7468 			}
7469 			parent = TAILQ_FIRST(&s->parents);
7470 			TAILQ_REMOVE(&s->parents, parent,
7471 			    entry);
7472 			got_object_tree_close(s->tree);
7473 			s->tree = parent->tree;
7474 			s->first_displayed_entry =
7475 			    parent->first_displayed_entry;
7476 			s->selected_entry =
7477 			    parent->selected_entry;
7478 			s->selected = parent->selected;
7479 			if (s->selected > view->nlines - 3) {
7480 				err = offset_selection_down(view);
7481 				if (err)
7482 					break;
7483 			}
7484 			free(parent);
7485 		} else if (S_ISDIR(got_tree_entry_get_mode(
7486 		    s->selected_entry))) {
7487 			struct got_tree_object *subtree;
7488 			view->count = 0;
7489 			err = got_object_open_as_tree(&subtree, s->repo,
7490 			    got_tree_entry_get_id(s->selected_entry));
7491 			if (err)
7492 				break;
7493 			err = tree_view_visit_subtree(s, subtree);
7494 			if (err) {
7495 				got_object_tree_close(subtree);
7496 				break;
7497 			}
7498 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7499 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7500 		break;
7501 	case KEY_RESIZE:
7502 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7503 			s->selected = view->nlines - 4;
7504 		view->count = 0;
7505 		break;
7506 	default:
7507 		view->count = 0;
7508 		break;
7509 	}
7510 
7511 	return err;
7512 }
7513 
7514 __dead static void
7515 usage_tree(void)
7516 {
7517 	endwin();
7518 	fprintf(stderr,
7519 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7520 	    getprogname());
7521 	exit(1);
7522 }
7523 
7524 static const struct got_error *
7525 cmd_tree(int argc, char *argv[])
7526 {
7527 	const struct got_error *error;
7528 	struct got_repository *repo = NULL;
7529 	struct got_worktree *worktree = NULL;
7530 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7531 	struct got_object_id *commit_id = NULL;
7532 	struct got_commit_object *commit = NULL;
7533 	const char *commit_id_arg = NULL;
7534 	char *label = NULL;
7535 	struct got_reference *ref = NULL;
7536 	const char *head_ref_name = NULL;
7537 	int ch;
7538 	struct tog_view *view;
7539 	int *pack_fds = NULL;
7540 
7541 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7542 		switch (ch) {
7543 		case 'c':
7544 			commit_id_arg = optarg;
7545 			break;
7546 		case 'r':
7547 			repo_path = realpath(optarg, NULL);
7548 			if (repo_path == NULL)
7549 				return got_error_from_errno2("realpath",
7550 				    optarg);
7551 			break;
7552 		default:
7553 			usage_tree();
7554 			/* NOTREACHED */
7555 		}
7556 	}
7557 
7558 	argc -= optind;
7559 	argv += optind;
7560 
7561 	if (argc > 1)
7562 		usage_tree();
7563 
7564 	error = got_repo_pack_fds_open(&pack_fds);
7565 	if (error != NULL)
7566 		goto done;
7567 
7568 	if (repo_path == NULL) {
7569 		cwd = getcwd(NULL, 0);
7570 		if (cwd == NULL)
7571 			return got_error_from_errno("getcwd");
7572 		error = got_worktree_open(&worktree, cwd);
7573 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7574 			goto done;
7575 		if (worktree)
7576 			repo_path =
7577 			    strdup(got_worktree_get_repo_path(worktree));
7578 		else
7579 			repo_path = strdup(cwd);
7580 		if (repo_path == NULL) {
7581 			error = got_error_from_errno("strdup");
7582 			goto done;
7583 		}
7584 	}
7585 
7586 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7587 	if (error != NULL)
7588 		goto done;
7589 
7590 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7591 	    repo, worktree);
7592 	if (error)
7593 		goto done;
7594 
7595 	init_curses();
7596 
7597 	error = apply_unveil(got_repo_get_path(repo), NULL);
7598 	if (error)
7599 		goto done;
7600 
7601 	error = tog_load_refs(repo, 0);
7602 	if (error)
7603 		goto done;
7604 
7605 	if (commit_id_arg == NULL) {
7606 		error = got_repo_match_object_id(&commit_id, &label,
7607 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7608 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7609 		if (error)
7610 			goto done;
7611 		head_ref_name = label;
7612 	} else {
7613 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7614 		if (error == NULL)
7615 			head_ref_name = got_ref_get_name(ref);
7616 		else if (error->code != GOT_ERR_NOT_REF)
7617 			goto done;
7618 		error = got_repo_match_object_id(&commit_id, NULL,
7619 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7620 		if (error)
7621 			goto done;
7622 	}
7623 
7624 	error = got_object_open_as_commit(&commit, repo, commit_id);
7625 	if (error)
7626 		goto done;
7627 
7628 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7629 	if (view == NULL) {
7630 		error = got_error_from_errno("view_open");
7631 		goto done;
7632 	}
7633 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7634 	if (error)
7635 		goto done;
7636 	if (!got_path_is_root_dir(in_repo_path)) {
7637 		error = tree_view_walk_path(&view->state.tree, commit,
7638 		    in_repo_path);
7639 		if (error)
7640 			goto done;
7641 	}
7642 
7643 	if (worktree) {
7644 		/* Release work tree lock. */
7645 		got_worktree_close(worktree);
7646 		worktree = NULL;
7647 	}
7648 	error = view_loop(view);
7649 done:
7650 	free(repo_path);
7651 	free(cwd);
7652 	free(commit_id);
7653 	free(label);
7654 	if (ref)
7655 		got_ref_close(ref);
7656 	if (repo) {
7657 		const struct got_error *close_err = got_repo_close(repo);
7658 		if (error == NULL)
7659 			error = close_err;
7660 	}
7661 	if (pack_fds) {
7662 		const struct got_error *pack_err =
7663 		    got_repo_pack_fds_close(pack_fds);
7664 		if (error == NULL)
7665 			error = pack_err;
7666 	}
7667 	tog_free_refs();
7668 	return error;
7669 }
7670 
7671 static const struct got_error *
7672 ref_view_load_refs(struct tog_ref_view_state *s)
7673 {
7674 	struct got_reflist_entry *sre;
7675 	struct tog_reflist_entry *re;
7676 
7677 	s->nrefs = 0;
7678 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7679 		if (strncmp(got_ref_get_name(sre->ref),
7680 		    "refs/got/", 9) == 0 &&
7681 		    strncmp(got_ref_get_name(sre->ref),
7682 		    "refs/got/backup/", 16) != 0)
7683 			continue;
7684 
7685 		re = malloc(sizeof(*re));
7686 		if (re == NULL)
7687 			return got_error_from_errno("malloc");
7688 
7689 		re->ref = got_ref_dup(sre->ref);
7690 		if (re->ref == NULL)
7691 			return got_error_from_errno("got_ref_dup");
7692 		re->idx = s->nrefs++;
7693 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7694 	}
7695 
7696 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7697 	return NULL;
7698 }
7699 
7700 static void
7701 ref_view_free_refs(struct tog_ref_view_state *s)
7702 {
7703 	struct tog_reflist_entry *re;
7704 
7705 	while (!TAILQ_EMPTY(&s->refs)) {
7706 		re = TAILQ_FIRST(&s->refs);
7707 		TAILQ_REMOVE(&s->refs, re, entry);
7708 		got_ref_close(re->ref);
7709 		free(re);
7710 	}
7711 }
7712 
7713 static const struct got_error *
7714 open_ref_view(struct tog_view *view, struct got_repository *repo)
7715 {
7716 	const struct got_error *err = NULL;
7717 	struct tog_ref_view_state *s = &view->state.ref;
7718 
7719 	s->selected_entry = 0;
7720 	s->repo = repo;
7721 
7722 	TAILQ_INIT(&s->refs);
7723 	STAILQ_INIT(&s->colors);
7724 
7725 	err = ref_view_load_refs(s);
7726 	if (err)
7727 		return err;
7728 
7729 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7730 		err = add_color(&s->colors, "^refs/heads/",
7731 		    TOG_COLOR_REFS_HEADS,
7732 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7733 		if (err)
7734 			goto done;
7735 
7736 		err = add_color(&s->colors, "^refs/tags/",
7737 		    TOG_COLOR_REFS_TAGS,
7738 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7739 		if (err)
7740 			goto done;
7741 
7742 		err = add_color(&s->colors, "^refs/remotes/",
7743 		    TOG_COLOR_REFS_REMOTES,
7744 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7745 		if (err)
7746 			goto done;
7747 
7748 		err = add_color(&s->colors, "^refs/got/backup/",
7749 		    TOG_COLOR_REFS_BACKUP,
7750 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7751 		if (err)
7752 			goto done;
7753 	}
7754 
7755 	view->show = show_ref_view;
7756 	view->input = input_ref_view;
7757 	view->close = close_ref_view;
7758 	view->search_start = search_start_ref_view;
7759 	view->search_next = search_next_ref_view;
7760 done:
7761 	if (err)
7762 		free_colors(&s->colors);
7763 	return err;
7764 }
7765 
7766 static const struct got_error *
7767 close_ref_view(struct tog_view *view)
7768 {
7769 	struct tog_ref_view_state *s = &view->state.ref;
7770 
7771 	ref_view_free_refs(s);
7772 	free_colors(&s->colors);
7773 
7774 	return NULL;
7775 }
7776 
7777 static const struct got_error *
7778 resolve_reflist_entry(struct got_object_id **commit_id,
7779     struct tog_reflist_entry *re, struct got_repository *repo)
7780 {
7781 	const struct got_error *err = NULL;
7782 	struct got_object_id *obj_id;
7783 	struct got_tag_object *tag = NULL;
7784 	int obj_type;
7785 
7786 	*commit_id = NULL;
7787 
7788 	err = got_ref_resolve(&obj_id, repo, re->ref);
7789 	if (err)
7790 		return err;
7791 
7792 	err = got_object_get_type(&obj_type, repo, obj_id);
7793 	if (err)
7794 		goto done;
7795 
7796 	switch (obj_type) {
7797 	case GOT_OBJ_TYPE_COMMIT:
7798 		*commit_id = obj_id;
7799 		break;
7800 	case GOT_OBJ_TYPE_TAG:
7801 		err = got_object_open_as_tag(&tag, repo, obj_id);
7802 		if (err)
7803 			goto done;
7804 		free(obj_id);
7805 		err = got_object_get_type(&obj_type, repo,
7806 		    got_object_tag_get_object_id(tag));
7807 		if (err)
7808 			goto done;
7809 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7810 			err = got_error(GOT_ERR_OBJ_TYPE);
7811 			goto done;
7812 		}
7813 		*commit_id = got_object_id_dup(
7814 		    got_object_tag_get_object_id(tag));
7815 		if (*commit_id == NULL) {
7816 			err = got_error_from_errno("got_object_id_dup");
7817 			goto done;
7818 		}
7819 		break;
7820 	default:
7821 		err = got_error(GOT_ERR_OBJ_TYPE);
7822 		break;
7823 	}
7824 
7825 done:
7826 	if (tag)
7827 		got_object_tag_close(tag);
7828 	if (err) {
7829 		free(*commit_id);
7830 		*commit_id = NULL;
7831 	}
7832 	return err;
7833 }
7834 
7835 static const struct got_error *
7836 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7837     struct tog_reflist_entry *re, struct got_repository *repo)
7838 {
7839 	struct tog_view *log_view;
7840 	const struct got_error *err = NULL;
7841 	struct got_object_id *commit_id = NULL;
7842 
7843 	*new_view = NULL;
7844 
7845 	err = resolve_reflist_entry(&commit_id, re, repo);
7846 	if (err) {
7847 		if (err->code != GOT_ERR_OBJ_TYPE)
7848 			return err;
7849 		else
7850 			return NULL;
7851 	}
7852 
7853 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7854 	if (log_view == NULL) {
7855 		err = got_error_from_errno("view_open");
7856 		goto done;
7857 	}
7858 
7859 	err = open_log_view(log_view, commit_id, repo,
7860 	    got_ref_get_name(re->ref), "", 0);
7861 done:
7862 	if (err)
7863 		view_close(log_view);
7864 	else
7865 		*new_view = log_view;
7866 	free(commit_id);
7867 	return err;
7868 }
7869 
7870 static void
7871 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7872 {
7873 	struct tog_reflist_entry *re;
7874 	int i = 0;
7875 
7876 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7877 		return;
7878 
7879 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7880 	while (i++ < maxscroll) {
7881 		if (re == NULL)
7882 			break;
7883 		s->first_displayed_entry = re;
7884 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7885 	}
7886 }
7887 
7888 static const struct got_error *
7889 ref_scroll_down(struct tog_view *view, int maxscroll)
7890 {
7891 	struct tog_ref_view_state *s = &view->state.ref;
7892 	struct tog_reflist_entry *next, *last;
7893 	int n = 0;
7894 
7895 	if (s->first_displayed_entry)
7896 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7897 	else
7898 		next = TAILQ_FIRST(&s->refs);
7899 
7900 	last = s->last_displayed_entry;
7901 	while (next && n++ < maxscroll) {
7902 		if (last) {
7903 			s->last_displayed_entry = last;
7904 			last = TAILQ_NEXT(last, entry);
7905 		}
7906 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7907 			s->first_displayed_entry = next;
7908 			next = TAILQ_NEXT(next, entry);
7909 		}
7910 	}
7911 
7912 	return NULL;
7913 }
7914 
7915 static const struct got_error *
7916 search_start_ref_view(struct tog_view *view)
7917 {
7918 	struct tog_ref_view_state *s = &view->state.ref;
7919 
7920 	s->matched_entry = NULL;
7921 	return NULL;
7922 }
7923 
7924 static int
7925 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7926 {
7927 	regmatch_t regmatch;
7928 
7929 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7930 	    0) == 0;
7931 }
7932 
7933 static const struct got_error *
7934 search_next_ref_view(struct tog_view *view)
7935 {
7936 	struct tog_ref_view_state *s = &view->state.ref;
7937 	struct tog_reflist_entry *re = NULL;
7938 
7939 	if (!view->searching) {
7940 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7941 		return NULL;
7942 	}
7943 
7944 	if (s->matched_entry) {
7945 		if (view->searching == TOG_SEARCH_FORWARD) {
7946 			if (s->selected_entry)
7947 				re = TAILQ_NEXT(s->selected_entry, entry);
7948 			else
7949 				re = TAILQ_PREV(s->selected_entry,
7950 				    tog_reflist_head, entry);
7951 		} else {
7952 			if (s->selected_entry == NULL)
7953 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7954 			else
7955 				re = TAILQ_PREV(s->selected_entry,
7956 				    tog_reflist_head, entry);
7957 		}
7958 	} else {
7959 		if (s->selected_entry)
7960 			re = s->selected_entry;
7961 		else if (view->searching == TOG_SEARCH_FORWARD)
7962 			re = TAILQ_FIRST(&s->refs);
7963 		else
7964 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7965 	}
7966 
7967 	while (1) {
7968 		if (re == NULL) {
7969 			if (s->matched_entry == NULL) {
7970 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7971 				return NULL;
7972 			}
7973 			if (view->searching == TOG_SEARCH_FORWARD)
7974 				re = TAILQ_FIRST(&s->refs);
7975 			else
7976 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7977 		}
7978 
7979 		if (match_reflist_entry(re, &view->regex)) {
7980 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7981 			s->matched_entry = re;
7982 			break;
7983 		}
7984 
7985 		if (view->searching == TOG_SEARCH_FORWARD)
7986 			re = TAILQ_NEXT(re, entry);
7987 		else
7988 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7989 	}
7990 
7991 	if (s->matched_entry) {
7992 		s->first_displayed_entry = s->matched_entry;
7993 		s->selected = 0;
7994 	}
7995 
7996 	return NULL;
7997 }
7998 
7999 static const struct got_error *
8000 show_ref_view(struct tog_view *view)
8001 {
8002 	const struct got_error *err = NULL;
8003 	struct tog_ref_view_state *s = &view->state.ref;
8004 	struct tog_reflist_entry *re;
8005 	char *line = NULL;
8006 	wchar_t *wline;
8007 	struct tog_color *tc;
8008 	int width, n;
8009 	int limit = view->nlines;
8010 
8011 	werase(view->window);
8012 
8013 	s->ndisplayed = 0;
8014 	if (view_is_hsplit_top(view))
8015 		--limit;  /* border */
8016 
8017 	if (limit == 0)
8018 		return NULL;
8019 
8020 	re = s->first_displayed_entry;
8021 
8022 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8023 	    s->nrefs) == -1)
8024 		return got_error_from_errno("asprintf");
8025 
8026 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8027 	if (err) {
8028 		free(line);
8029 		return err;
8030 	}
8031 	if (view_needs_focus_indication(view))
8032 		wstandout(view->window);
8033 	waddwstr(view->window, wline);
8034 	while (width++ < view->ncols)
8035 		waddch(view->window, ' ');
8036 	if (view_needs_focus_indication(view))
8037 		wstandend(view->window);
8038 	free(wline);
8039 	wline = NULL;
8040 	free(line);
8041 	line = NULL;
8042 	if (--limit <= 0)
8043 		return NULL;
8044 
8045 	n = 0;
8046 	while (re && limit > 0) {
8047 		char *line = NULL;
8048 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8049 
8050 		if (s->show_date) {
8051 			struct got_commit_object *ci;
8052 			struct got_tag_object *tag;
8053 			struct got_object_id *id;
8054 			struct tm tm;
8055 			time_t t;
8056 
8057 			err = got_ref_resolve(&id, s->repo, re->ref);
8058 			if (err)
8059 				return err;
8060 			err = got_object_open_as_tag(&tag, s->repo, id);
8061 			if (err) {
8062 				if (err->code != GOT_ERR_OBJ_TYPE) {
8063 					free(id);
8064 					return err;
8065 				}
8066 				err = got_object_open_as_commit(&ci, s->repo,
8067 				    id);
8068 				if (err) {
8069 					free(id);
8070 					return err;
8071 				}
8072 				t = got_object_commit_get_committer_time(ci);
8073 				got_object_commit_close(ci);
8074 			} else {
8075 				t = got_object_tag_get_tagger_time(tag);
8076 				got_object_tag_close(tag);
8077 			}
8078 			free(id);
8079 			if (gmtime_r(&t, &tm) == NULL)
8080 				return got_error_from_errno("gmtime_r");
8081 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8082 				return got_error(GOT_ERR_NO_SPACE);
8083 		}
8084 		if (got_ref_is_symbolic(re->ref)) {
8085 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8086 			    ymd : "", got_ref_get_name(re->ref),
8087 			    got_ref_get_symref_target(re->ref)) == -1)
8088 				return got_error_from_errno("asprintf");
8089 		} else if (s->show_ids) {
8090 			struct got_object_id *id;
8091 			char *id_str;
8092 			err = got_ref_resolve(&id, s->repo, re->ref);
8093 			if (err)
8094 				return err;
8095 			err = got_object_id_str(&id_str, id);
8096 			if (err) {
8097 				free(id);
8098 				return err;
8099 			}
8100 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8101 			    got_ref_get_name(re->ref), id_str) == -1) {
8102 				err = got_error_from_errno("asprintf");
8103 				free(id);
8104 				free(id_str);
8105 				return err;
8106 			}
8107 			free(id);
8108 			free(id_str);
8109 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8110 		    got_ref_get_name(re->ref)) == -1)
8111 			return got_error_from_errno("asprintf");
8112 
8113 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8114 		    0, 0);
8115 		if (err) {
8116 			free(line);
8117 			return err;
8118 		}
8119 		if (n == s->selected) {
8120 			if (view->focussed)
8121 				wstandout(view->window);
8122 			s->selected_entry = re;
8123 		}
8124 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8125 		if (tc)
8126 			wattr_on(view->window,
8127 			    COLOR_PAIR(tc->colorpair), NULL);
8128 		waddwstr(view->window, wline);
8129 		if (tc)
8130 			wattr_off(view->window,
8131 			    COLOR_PAIR(tc->colorpair), NULL);
8132 		if (width < view->ncols - 1)
8133 			waddch(view->window, '\n');
8134 		if (n == s->selected && view->focussed)
8135 			wstandend(view->window);
8136 		free(line);
8137 		free(wline);
8138 		wline = NULL;
8139 		n++;
8140 		s->ndisplayed++;
8141 		s->last_displayed_entry = re;
8142 
8143 		limit--;
8144 		re = TAILQ_NEXT(re, entry);
8145 	}
8146 
8147 	view_border(view);
8148 	return err;
8149 }
8150 
8151 static const struct got_error *
8152 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8153     struct tog_reflist_entry *re, struct got_repository *repo)
8154 {
8155 	const struct got_error *err = NULL;
8156 	struct got_object_id *commit_id = NULL;
8157 	struct tog_view *tree_view;
8158 
8159 	*new_view = NULL;
8160 
8161 	err = resolve_reflist_entry(&commit_id, re, repo);
8162 	if (err) {
8163 		if (err->code != GOT_ERR_OBJ_TYPE)
8164 			return err;
8165 		else
8166 			return NULL;
8167 	}
8168 
8169 
8170 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8171 	if (tree_view == NULL) {
8172 		err = got_error_from_errno("view_open");
8173 		goto done;
8174 	}
8175 
8176 	err = open_tree_view(tree_view, commit_id,
8177 	    got_ref_get_name(re->ref), repo);
8178 	if (err)
8179 		goto done;
8180 
8181 	*new_view = tree_view;
8182 done:
8183 	free(commit_id);
8184 	return err;
8185 }
8186 
8187 static const struct got_error *
8188 ref_goto_line(struct tog_view *view, int nlines)
8189 {
8190 	const struct got_error		*err = NULL;
8191 	struct tog_ref_view_state	*s = &view->state.ref;
8192 	int				 g, idx = s->selected_entry->idx;
8193 
8194 	g = view->gline;
8195 	view->gline = 0;
8196 
8197 	if (g == 0)
8198 		g = 1;
8199 	else if (g > s->nrefs)
8200 		g = s->nrefs;
8201 
8202 	if (g >= s->first_displayed_entry->idx + 1 &&
8203 	    g <= s->last_displayed_entry->idx + 1 &&
8204 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8205 		s->selected = g - s->first_displayed_entry->idx - 1;
8206 		return NULL;
8207 	}
8208 
8209 	if (idx + 1 < g) {
8210 		err = ref_scroll_down(view, g - idx - 1);
8211 		if (err)
8212 			return err;
8213 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8214 		    s->first_displayed_entry->idx + s->selected < g &&
8215 		    s->selected < s->ndisplayed - 1)
8216 			s->selected = g - s->first_displayed_entry->idx - 1;
8217 	} else if (idx + 1 > g)
8218 		ref_scroll_up(s, idx - g + 1);
8219 
8220 	if (g < nlines && s->first_displayed_entry->idx == 0)
8221 		s->selected = g - 1;
8222 
8223 	return NULL;
8224 
8225 }
8226 
8227 static const struct got_error *
8228 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8229 {
8230 	const struct got_error *err = NULL;
8231 	struct tog_ref_view_state *s = &view->state.ref;
8232 	struct tog_reflist_entry *re;
8233 	int n, nscroll = view->nlines - 1;
8234 
8235 	if (view->gline)
8236 		return ref_goto_line(view, nscroll);
8237 
8238 	switch (ch) {
8239 	case 'i':
8240 		s->show_ids = !s->show_ids;
8241 		view->count = 0;
8242 		break;
8243 	case 'm':
8244 		s->show_date = !s->show_date;
8245 		view->count = 0;
8246 		break;
8247 	case 'o':
8248 		s->sort_by_date = !s->sort_by_date;
8249 		view->count = 0;
8250 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8251 		    got_ref_cmp_by_commit_timestamp_descending :
8252 		    tog_ref_cmp_by_name, s->repo);
8253 		if (err)
8254 			break;
8255 		got_reflist_object_id_map_free(tog_refs_idmap);
8256 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8257 		    &tog_refs, s->repo);
8258 		if (err)
8259 			break;
8260 		ref_view_free_refs(s);
8261 		err = ref_view_load_refs(s);
8262 		break;
8263 	case KEY_ENTER:
8264 	case '\r':
8265 		view->count = 0;
8266 		if (!s->selected_entry)
8267 			break;
8268 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8269 		break;
8270 	case 'T':
8271 		view->count = 0;
8272 		if (!s->selected_entry)
8273 			break;
8274 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8275 		break;
8276 	case 'g':
8277 	case '=':
8278 	case KEY_HOME:
8279 		s->selected = 0;
8280 		view->count = 0;
8281 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8282 		break;
8283 	case 'G':
8284 	case '*':
8285 	case KEY_END: {
8286 		int eos = view->nlines - 1;
8287 
8288 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8289 			--eos;  /* border */
8290 		s->selected = 0;
8291 		view->count = 0;
8292 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8293 		for (n = 0; n < eos; n++) {
8294 			if (re == NULL)
8295 				break;
8296 			s->first_displayed_entry = re;
8297 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8298 		}
8299 		if (n > 0)
8300 			s->selected = n - 1;
8301 		break;
8302 	}
8303 	case 'k':
8304 	case KEY_UP:
8305 	case CTRL('p'):
8306 		if (s->selected > 0) {
8307 			s->selected--;
8308 			break;
8309 		}
8310 		ref_scroll_up(s, 1);
8311 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8312 			view->count = 0;
8313 		break;
8314 	case CTRL('u'):
8315 	case 'u':
8316 		nscroll /= 2;
8317 		/* FALL THROUGH */
8318 	case KEY_PPAGE:
8319 	case CTRL('b'):
8320 	case 'b':
8321 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8322 			s->selected -= MIN(nscroll, s->selected);
8323 		ref_scroll_up(s, MAX(0, nscroll));
8324 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8325 			view->count = 0;
8326 		break;
8327 	case 'j':
8328 	case KEY_DOWN:
8329 	case CTRL('n'):
8330 		if (s->selected < s->ndisplayed - 1) {
8331 			s->selected++;
8332 			break;
8333 		}
8334 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8335 			/* can't scroll any further */
8336 			view->count = 0;
8337 			break;
8338 		}
8339 		ref_scroll_down(view, 1);
8340 		break;
8341 	case CTRL('d'):
8342 	case 'd':
8343 		nscroll /= 2;
8344 		/* FALL THROUGH */
8345 	case KEY_NPAGE:
8346 	case CTRL('f'):
8347 	case 'f':
8348 	case ' ':
8349 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8350 			/* can't scroll any further; move cursor down */
8351 			if (s->selected < s->ndisplayed - 1)
8352 				s->selected += MIN(nscroll,
8353 				    s->ndisplayed - s->selected - 1);
8354 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8355 				s->selected += s->ndisplayed - s->selected - 1;
8356 			view->count = 0;
8357 			break;
8358 		}
8359 		ref_scroll_down(view, nscroll);
8360 		break;
8361 	case CTRL('l'):
8362 		view->count = 0;
8363 		tog_free_refs();
8364 		err = tog_load_refs(s->repo, s->sort_by_date);
8365 		if (err)
8366 			break;
8367 		ref_view_free_refs(s);
8368 		err = ref_view_load_refs(s);
8369 		break;
8370 	case KEY_RESIZE:
8371 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8372 			s->selected = view->nlines - 2;
8373 		break;
8374 	default:
8375 		view->count = 0;
8376 		break;
8377 	}
8378 
8379 	return err;
8380 }
8381 
8382 __dead static void
8383 usage_ref(void)
8384 {
8385 	endwin();
8386 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8387 	    getprogname());
8388 	exit(1);
8389 }
8390 
8391 static const struct got_error *
8392 cmd_ref(int argc, char *argv[])
8393 {
8394 	const struct got_error *error;
8395 	struct got_repository *repo = NULL;
8396 	struct got_worktree *worktree = NULL;
8397 	char *cwd = NULL, *repo_path = NULL;
8398 	int ch;
8399 	struct tog_view *view;
8400 	int *pack_fds = NULL;
8401 
8402 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8403 		switch (ch) {
8404 		case 'r':
8405 			repo_path = realpath(optarg, NULL);
8406 			if (repo_path == NULL)
8407 				return got_error_from_errno2("realpath",
8408 				    optarg);
8409 			break;
8410 		default:
8411 			usage_ref();
8412 			/* NOTREACHED */
8413 		}
8414 	}
8415 
8416 	argc -= optind;
8417 	argv += optind;
8418 
8419 	if (argc > 1)
8420 		usage_ref();
8421 
8422 	error = got_repo_pack_fds_open(&pack_fds);
8423 	if (error != NULL)
8424 		goto done;
8425 
8426 	if (repo_path == NULL) {
8427 		cwd = getcwd(NULL, 0);
8428 		if (cwd == NULL)
8429 			return got_error_from_errno("getcwd");
8430 		error = got_worktree_open(&worktree, cwd);
8431 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8432 			goto done;
8433 		if (worktree)
8434 			repo_path =
8435 			    strdup(got_worktree_get_repo_path(worktree));
8436 		else
8437 			repo_path = strdup(cwd);
8438 		if (repo_path == NULL) {
8439 			error = got_error_from_errno("strdup");
8440 			goto done;
8441 		}
8442 	}
8443 
8444 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8445 	if (error != NULL)
8446 		goto done;
8447 
8448 	init_curses();
8449 
8450 	error = apply_unveil(got_repo_get_path(repo), NULL);
8451 	if (error)
8452 		goto done;
8453 
8454 	error = tog_load_refs(repo, 0);
8455 	if (error)
8456 		goto done;
8457 
8458 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8459 	if (view == NULL) {
8460 		error = got_error_from_errno("view_open");
8461 		goto done;
8462 	}
8463 
8464 	error = open_ref_view(view, repo);
8465 	if (error)
8466 		goto done;
8467 
8468 	if (worktree) {
8469 		/* Release work tree lock. */
8470 		got_worktree_close(worktree);
8471 		worktree = NULL;
8472 	}
8473 	error = view_loop(view);
8474 done:
8475 	free(repo_path);
8476 	free(cwd);
8477 	if (repo) {
8478 		const struct got_error *close_err = got_repo_close(repo);
8479 		if (close_err)
8480 			error = close_err;
8481 	}
8482 	if (pack_fds) {
8483 		const struct got_error *pack_err =
8484 		    got_repo_pack_fds_close(pack_fds);
8485 		if (error == NULL)
8486 			error = pack_err;
8487 	}
8488 	tog_free_refs();
8489 	return error;
8490 }
8491 
8492 static const struct got_error*
8493 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8494     const char *str)
8495 {
8496 	size_t len;
8497 
8498 	if (win == NULL)
8499 		win = stdscr;
8500 
8501 	len = strlen(str);
8502 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8503 
8504 	if (focus)
8505 		wstandout(win);
8506 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8507 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8508 	if (focus)
8509 		wstandend(win);
8510 
8511 	return NULL;
8512 }
8513 
8514 static const struct got_error *
8515 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8516 {
8517 	off_t *p;
8518 
8519 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8520 	if (p == NULL) {
8521 		free(*line_offsets);
8522 		*line_offsets = NULL;
8523 		return got_error_from_errno("reallocarray");
8524 	}
8525 
8526 	*line_offsets = p;
8527 	(*line_offsets)[*nlines] = off;
8528 	++(*nlines);
8529 	return NULL;
8530 }
8531 
8532 static const struct got_error *
8533 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8534 {
8535 	*ret = 0;
8536 
8537 	for (;n > 0; --n, ++km) {
8538 		char	*t0, *t, *k;
8539 		size_t	 len = 1;
8540 
8541 		if (km->keys == NULL)
8542 			continue;
8543 
8544 		t = t0 = strdup(km->keys);
8545 		if (t0 == NULL)
8546 			return got_error_from_errno("strdup");
8547 
8548 		len += strlen(t);
8549 		while ((k = strsep(&t, " ")) != NULL)
8550 			len += strlen(k) > 1 ? 2 : 0;
8551 		free(t0);
8552 		*ret = MAX(*ret, len);
8553 	}
8554 
8555 	return NULL;
8556 }
8557 
8558 /*
8559  * Write keymap section headers, keys, and key info in km to f.
8560  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8561  * wrap control and symbolic keys in guillemets, else use <>.
8562  */
8563 static const struct got_error *
8564 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8565 {
8566 	int n, len = width;
8567 
8568 	if (km->keys) {
8569 		static const char *u8_glyph[] = {
8570 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8571 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8572 		};
8573 		char	*t0, *t, *k;
8574 		int	 cs, s, first = 1;
8575 
8576 		cs = got_locale_is_utf8();
8577 
8578 		t = t0 = strdup(km->keys);
8579 		if (t0 == NULL)
8580 			return got_error_from_errno("strdup");
8581 
8582 		len = strlen(km->keys);
8583 		while ((k = strsep(&t, " ")) != NULL) {
8584 			s = strlen(k) > 1;  /* control or symbolic key */
8585 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8586 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8587 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8588 			if (n < 0) {
8589 				free(t0);
8590 				return got_error_from_errno("fprintf");
8591 			}
8592 			first = 0;
8593 			len += s ? 2 : 0;
8594 			*off += n;
8595 		}
8596 		free(t0);
8597 	}
8598 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8599 	if (n < 0)
8600 		return got_error_from_errno("fprintf");
8601 	*off += n;
8602 
8603 	return NULL;
8604 }
8605 
8606 static const struct got_error *
8607 format_help(struct tog_help_view_state *s)
8608 {
8609 	const struct got_error		*err = NULL;
8610 	off_t				 off = 0;
8611 	int				 i, max, n, show = s->all;
8612 	static const struct tog_key_map	 km[] = {
8613 #define KEYMAP_(info, type)	{ NULL, (info), type }
8614 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8615 		GENERATE_HELP
8616 #undef KEYMAP_
8617 #undef KEY_
8618 	};
8619 
8620 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8621 	if (err)
8622 		return err;
8623 
8624 	n = nitems(km);
8625 	err = max_key_str(&max, km, n);
8626 	if (err)
8627 		return err;
8628 
8629 	for (i = 0; i < n; ++i) {
8630 		if (km[i].keys == NULL) {
8631 			show = s->all;
8632 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8633 			    km[i].type == s->type || s->all)
8634 				show = 1;
8635 		}
8636 		if (show) {
8637 			err = format_help_line(&off, s->f, &km[i], max);
8638 			if (err)
8639 				return err;
8640 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8641 			if (err)
8642 				return err;
8643 		}
8644 	}
8645 	fputc('\n', s->f);
8646 	++off;
8647 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8648 	return err;
8649 }
8650 
8651 static const struct got_error *
8652 create_help(struct tog_help_view_state *s)
8653 {
8654 	FILE			*f;
8655 	const struct got_error	*err;
8656 
8657 	free(s->line_offsets);
8658 	s->line_offsets = NULL;
8659 	s->nlines = 0;
8660 
8661 	f = got_opentemp();
8662 	if (f == NULL)
8663 		return got_error_from_errno("got_opentemp");
8664 	s->f = f;
8665 
8666 	err = format_help(s);
8667 	if (err)
8668 		return err;
8669 
8670 	if (s->f && fflush(s->f) != 0)
8671 		return got_error_from_errno("fflush");
8672 
8673 	return NULL;
8674 }
8675 
8676 static const struct got_error *
8677 search_start_help_view(struct tog_view *view)
8678 {
8679 	view->state.help.matched_line = 0;
8680 	return NULL;
8681 }
8682 
8683 static void
8684 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8685     size_t *nlines, int **first, int **last, int **match, int **selected)
8686 {
8687 	struct tog_help_view_state *s = &view->state.help;
8688 
8689 	*f = s->f;
8690 	*nlines = s->nlines;
8691 	*line_offsets = s->line_offsets;
8692 	*match = &s->matched_line;
8693 	*first = &s->first_displayed_line;
8694 	*last = &s->last_displayed_line;
8695 	*selected = &s->selected_line;
8696 }
8697 
8698 static const struct got_error *
8699 show_help_view(struct tog_view *view)
8700 {
8701 	struct tog_help_view_state	*s = &view->state.help;
8702 	const struct got_error		*err;
8703 	regmatch_t			*regmatch = &view->regmatch;
8704 	wchar_t				*wline;
8705 	char				*line;
8706 	ssize_t				 linelen;
8707 	size_t				 linesz = 0;
8708 	int				 width, nprinted = 0, rc = 0;
8709 	int				 eos = view->nlines;
8710 
8711 	if (view_is_hsplit_top(view))
8712 		--eos;  /* account for border */
8713 
8714 	s->lineno = 0;
8715 	rewind(s->f);
8716 	werase(view->window);
8717 
8718 	if (view->gline > s->nlines - 1)
8719 		view->gline = s->nlines - 1;
8720 
8721 	err = win_draw_center(view->window, 0, 0, view->ncols,
8722 	    view_needs_focus_indication(view),
8723 	    "tog help (press q to return to tog)");
8724 	if (err)
8725 		return err;
8726 	if (eos <= 1)
8727 		return NULL;
8728 	waddstr(view->window, "\n\n");
8729 	eos -= 2;
8730 
8731 	s->eof = 0;
8732 	view->maxx = 0;
8733 	line = NULL;
8734 	while (eos > 0 && nprinted < eos) {
8735 		attr_t attr = 0;
8736 
8737 		linelen = getline(&line, &linesz, s->f);
8738 		if (linelen == -1) {
8739 			if (!feof(s->f)) {
8740 				free(line);
8741 				return got_ferror(s->f, GOT_ERR_IO);
8742 			}
8743 			s->eof = 1;
8744 			break;
8745 		}
8746 		if (++s->lineno < s->first_displayed_line)
8747 			continue;
8748 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8749 			continue;
8750 		if (s->lineno == view->hiline)
8751 			attr = A_STANDOUT;
8752 
8753 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8754 		    view->x ? 1 : 0);
8755 		if (err) {
8756 			free(line);
8757 			return err;
8758 		}
8759 		view->maxx = MAX(view->maxx, width);
8760 		free(wline);
8761 		wline = NULL;
8762 
8763 		if (attr)
8764 			wattron(view->window, attr);
8765 		if (s->first_displayed_line + nprinted == s->matched_line &&
8766 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8767 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8768 			    view->window, view->x, regmatch);
8769 			if (err) {
8770 				free(line);
8771 				return err;
8772 			}
8773 		} else {
8774 			int skip;
8775 
8776 			err = format_line(&wline, &width, &skip, line,
8777 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8778 			if (err) {
8779 				free(line);
8780 				return err;
8781 			}
8782 			rc = waddwstr(view->window, &wline[skip]);
8783 			free(wline);
8784 			wline = NULL;
8785 			if (rc == ERR)
8786 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8787 		}
8788 		if (s->lineno == view->hiline) {
8789 			while (width++ < view->ncols)
8790 				waddch(view->window, ' ');
8791 		} else {
8792 			if (width <= view->ncols)
8793 				waddch(view->window, '\n');
8794 		}
8795 		if (attr)
8796 			wattroff(view->window, attr);
8797 		if (++nprinted == 1)
8798 			s->first_displayed_line = s->lineno;
8799 	}
8800 	free(line);
8801 	if (nprinted > 0)
8802 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8803 	else
8804 		s->last_displayed_line = s->first_displayed_line;
8805 
8806 	view_border(view);
8807 
8808 	if (s->eof) {
8809 		rc = waddnstr(view->window,
8810 		    "See the tog(1) manual page for full documentation",
8811 		    view->ncols - 1);
8812 		if (rc == ERR)
8813 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8814 	} else {
8815 		wmove(view->window, view->nlines - 1, 0);
8816 		wclrtoeol(view->window);
8817 		wstandout(view->window);
8818 		rc = waddnstr(view->window, "scroll down for more...",
8819 		    view->ncols - 1);
8820 		if (rc == ERR)
8821 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8822 		if (getcurx(view->window) < view->ncols - 6) {
8823 			rc = wprintw(view->window, "[%.0f%%]",
8824 			    100.00 * s->last_displayed_line / s->nlines);
8825 			if (rc == ERR)
8826 				return got_error_msg(GOT_ERR_IO, "wprintw");
8827 		}
8828 		wstandend(view->window);
8829 	}
8830 
8831 	return NULL;
8832 }
8833 
8834 static const struct got_error *
8835 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8836 {
8837 	struct tog_help_view_state	*s = &view->state.help;
8838 	const struct got_error		*err = NULL;
8839 	char				*line = NULL;
8840 	ssize_t				 linelen;
8841 	size_t				 linesz = 0;
8842 	int				 eos, nscroll;
8843 
8844 	eos = nscroll = view->nlines;
8845 	if (view_is_hsplit_top(view))
8846 		--eos;  /* border */
8847 
8848 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8849 
8850 	switch (ch) {
8851 	case '0':
8852 		view->x = 0;
8853 		break;
8854 	case '$':
8855 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8856 		view->count = 0;
8857 		break;
8858 	case KEY_RIGHT:
8859 	case 'l':
8860 		if (view->x + view->ncols / 3 < view->maxx)
8861 			view->x += 2;
8862 		else
8863 			view->count = 0;
8864 		break;
8865 	case KEY_LEFT:
8866 	case 'h':
8867 		view->x -= MIN(view->x, 2);
8868 		if (view->x <= 0)
8869 			view->count = 0;
8870 		break;
8871 	case 'g':
8872 	case KEY_HOME:
8873 		s->first_displayed_line = 1;
8874 		view->count = 0;
8875 		break;
8876 	case 'G':
8877 	case KEY_END:
8878 		view->count = 0;
8879 		if (s->eof)
8880 			break;
8881 		s->first_displayed_line = (s->nlines - eos) + 3;
8882 		s->eof = 1;
8883 		break;
8884 	case 'k':
8885 	case KEY_UP:
8886 		if (s->first_displayed_line > 1)
8887 			--s->first_displayed_line;
8888 		else
8889 			view->count = 0;
8890 		break;
8891 	case CTRL('u'):
8892 	case 'u':
8893 		nscroll /= 2;
8894 		/* FALL THROUGH */
8895 	case KEY_PPAGE:
8896 	case CTRL('b'):
8897 	case 'b':
8898 		if (s->first_displayed_line == 1) {
8899 			view->count = 0;
8900 			break;
8901 		}
8902 		while (--nscroll > 0 && s->first_displayed_line > 1)
8903 			s->first_displayed_line--;
8904 		break;
8905 	case 'j':
8906 	case KEY_DOWN:
8907 	case CTRL('n'):
8908 		if (!s->eof)
8909 			++s->first_displayed_line;
8910 		else
8911 			view->count = 0;
8912 		break;
8913 	case CTRL('d'):
8914 	case 'd':
8915 		nscroll /= 2;
8916 		/* FALL THROUGH */
8917 	case KEY_NPAGE:
8918 	case CTRL('f'):
8919 	case 'f':
8920 	case ' ':
8921 		if (s->eof) {
8922 			view->count = 0;
8923 			break;
8924 		}
8925 		while (!s->eof && --nscroll > 0) {
8926 			linelen = getline(&line, &linesz, s->f);
8927 			s->first_displayed_line++;
8928 			if (linelen == -1) {
8929 				if (feof(s->f))
8930 					s->eof = 1;
8931 				else
8932 					err = got_ferror(s->f, GOT_ERR_IO);
8933 				break;
8934 			}
8935 		}
8936 		free(line);
8937 		break;
8938 	default:
8939 		view->count = 0;
8940 		break;
8941 	}
8942 
8943 	return err;
8944 }
8945 
8946 static const struct got_error *
8947 close_help_view(struct tog_view *view)
8948 {
8949 	struct tog_help_view_state *s = &view->state.help;
8950 
8951 	free(s->line_offsets);
8952 	s->line_offsets = NULL;
8953 	if (fclose(s->f) == EOF)
8954 		return got_error_from_errno("fclose");
8955 
8956 	return NULL;
8957 }
8958 
8959 static const struct got_error *
8960 reset_help_view(struct tog_view *view)
8961 {
8962 	struct tog_help_view_state *s = &view->state.help;
8963 
8964 
8965 	if (s->f && fclose(s->f) == EOF)
8966 		return got_error_from_errno("fclose");
8967 
8968 	wclear(view->window);
8969 	view->count = 0;
8970 	view->x = 0;
8971 	s->all = !s->all;
8972 	s->first_displayed_line = 1;
8973 	s->last_displayed_line = view->nlines;
8974 	s->matched_line = 0;
8975 
8976 	return create_help(s);
8977 }
8978 
8979 static const struct got_error *
8980 open_help_view(struct tog_view *view, struct tog_view *parent)
8981 {
8982 	const struct got_error		*err = NULL;
8983 	struct tog_help_view_state	*s = &view->state.help;
8984 
8985 	s->type = (enum tog_keymap_type)parent->type;
8986 	s->first_displayed_line = 1;
8987 	s->last_displayed_line = view->nlines;
8988 	s->selected_line = 1;
8989 
8990 	view->show = show_help_view;
8991 	view->input = input_help_view;
8992 	view->reset = reset_help_view;
8993 	view->close = close_help_view;
8994 	view->search_start = search_start_help_view;
8995 	view->search_setup = search_setup_help_view;
8996 	view->search_next = search_next_view_match;
8997 
8998 	err = create_help(s);
8999 	return err;
9000 }
9001 
9002 static const struct got_error *
9003 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9004     enum tog_view_type request, int y, int x)
9005 {
9006 	const struct got_error *err = NULL;
9007 
9008 	*new_view = NULL;
9009 
9010 	switch (request) {
9011 	case TOG_VIEW_DIFF:
9012 		if (view->type == TOG_VIEW_LOG) {
9013 			struct tog_log_view_state *s = &view->state.log;
9014 
9015 			err = open_diff_view_for_commit(new_view, y, x,
9016 			    s->selected_entry->commit, s->selected_entry->id,
9017 			    view, s->repo);
9018 		} else
9019 			return got_error_msg(GOT_ERR_NOT_IMPL,
9020 			    "parent/child view pair not supported");
9021 		break;
9022 	case TOG_VIEW_BLAME:
9023 		if (view->type == TOG_VIEW_TREE) {
9024 			struct tog_tree_view_state *s = &view->state.tree;
9025 
9026 			err = blame_tree_entry(new_view, y, x,
9027 			    s->selected_entry, &s->parents, s->commit_id,
9028 			    s->repo);
9029 		} else
9030 			return got_error_msg(GOT_ERR_NOT_IMPL,
9031 			    "parent/child view pair not supported");
9032 		break;
9033 	case TOG_VIEW_LOG:
9034 		if (view->type == TOG_VIEW_BLAME)
9035 			err = log_annotated_line(new_view, y, x,
9036 			    view->state.blame.repo, view->state.blame.id_to_log);
9037 		else if (view->type == TOG_VIEW_TREE)
9038 			err = log_selected_tree_entry(new_view, y, x,
9039 			    &view->state.tree);
9040 		else if (view->type == TOG_VIEW_REF)
9041 			err = log_ref_entry(new_view, y, x,
9042 			    view->state.ref.selected_entry,
9043 			    view->state.ref.repo);
9044 		else
9045 			return got_error_msg(GOT_ERR_NOT_IMPL,
9046 			    "parent/child view pair not supported");
9047 		break;
9048 	case TOG_VIEW_TREE:
9049 		if (view->type == TOG_VIEW_LOG)
9050 			err = browse_commit_tree(new_view, y, x,
9051 			    view->state.log.selected_entry,
9052 			    view->state.log.in_repo_path,
9053 			    view->state.log.head_ref_name,
9054 			    view->state.log.repo);
9055 		else if (view->type == TOG_VIEW_REF)
9056 			err = browse_ref_tree(new_view, y, x,
9057 			    view->state.ref.selected_entry,
9058 			    view->state.ref.repo);
9059 		else
9060 			return got_error_msg(GOT_ERR_NOT_IMPL,
9061 			    "parent/child view pair not supported");
9062 		break;
9063 	case TOG_VIEW_REF:
9064 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9065 		if (*new_view == NULL)
9066 			return got_error_from_errno("view_open");
9067 		if (view->type == TOG_VIEW_LOG)
9068 			err = open_ref_view(*new_view, view->state.log.repo);
9069 		else if (view->type == TOG_VIEW_TREE)
9070 			err = open_ref_view(*new_view, view->state.tree.repo);
9071 		else
9072 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9073 			    "parent/child view pair not supported");
9074 		if (err)
9075 			view_close(*new_view);
9076 		break;
9077 	case TOG_VIEW_HELP:
9078 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9079 		if (*new_view == NULL)
9080 			return got_error_from_errno("view_open");
9081 		err = open_help_view(*new_view, view);
9082 		if (err)
9083 			view_close(*new_view);
9084 		break;
9085 	default:
9086 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9087 	}
9088 
9089 	return err;
9090 }
9091 
9092 /*
9093  * If view was scrolled down to move the selected line into view when opening a
9094  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9095  */
9096 static void
9097 offset_selection_up(struct tog_view *view)
9098 {
9099 	switch (view->type) {
9100 	case TOG_VIEW_BLAME: {
9101 		struct tog_blame_view_state *s = &view->state.blame;
9102 		if (s->first_displayed_line == 1) {
9103 			s->selected_line = MAX(s->selected_line - view->offset,
9104 			    1);
9105 			break;
9106 		}
9107 		if (s->first_displayed_line > view->offset)
9108 			s->first_displayed_line -= view->offset;
9109 		else
9110 			s->first_displayed_line = 1;
9111 		s->selected_line += view->offset;
9112 		break;
9113 	}
9114 	case TOG_VIEW_LOG:
9115 		log_scroll_up(&view->state.log, view->offset);
9116 		view->state.log.selected += view->offset;
9117 		break;
9118 	case TOG_VIEW_REF:
9119 		ref_scroll_up(&view->state.ref, view->offset);
9120 		view->state.ref.selected += view->offset;
9121 		break;
9122 	case TOG_VIEW_TREE:
9123 		tree_scroll_up(&view->state.tree, view->offset);
9124 		view->state.tree.selected += view->offset;
9125 		break;
9126 	default:
9127 		break;
9128 	}
9129 
9130 	view->offset = 0;
9131 }
9132 
9133 /*
9134  * If the selected line is in the section of screen covered by the bottom split,
9135  * scroll down offset lines to move it into view and index its new position.
9136  */
9137 static const struct got_error *
9138 offset_selection_down(struct tog_view *view)
9139 {
9140 	const struct got_error	*err = NULL;
9141 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9142 	int			*selected = NULL;
9143 	int			 header, offset;
9144 
9145 	switch (view->type) {
9146 	case TOG_VIEW_BLAME: {
9147 		struct tog_blame_view_state *s = &view->state.blame;
9148 		header = 3;
9149 		scrolld = NULL;
9150 		if (s->selected_line > view->nlines - header) {
9151 			offset = abs(view->nlines - s->selected_line - header);
9152 			s->first_displayed_line += offset;
9153 			s->selected_line -= offset;
9154 			view->offset = offset;
9155 		}
9156 		break;
9157 	}
9158 	case TOG_VIEW_LOG: {
9159 		struct tog_log_view_state *s = &view->state.log;
9160 		scrolld = &log_scroll_down;
9161 		header = view_is_parent_view(view) ? 3 : 2;
9162 		selected = &s->selected;
9163 		break;
9164 	}
9165 	case TOG_VIEW_REF: {
9166 		struct tog_ref_view_state *s = &view->state.ref;
9167 		scrolld = &ref_scroll_down;
9168 		header = 3;
9169 		selected = &s->selected;
9170 		break;
9171 	}
9172 	case TOG_VIEW_TREE: {
9173 		struct tog_tree_view_state *s = &view->state.tree;
9174 		scrolld = &tree_scroll_down;
9175 		header = 5;
9176 		selected = &s->selected;
9177 		break;
9178 	}
9179 	default:
9180 		selected = NULL;
9181 		scrolld = NULL;
9182 		header = 0;
9183 		break;
9184 	}
9185 
9186 	if (selected && *selected > view->nlines - header) {
9187 		offset = abs(view->nlines - *selected - header);
9188 		view->offset = offset;
9189 		if (scrolld && offset) {
9190 			err = scrolld(view, offset);
9191 			*selected -= offset;
9192 		}
9193 	}
9194 
9195 	return err;
9196 }
9197 
9198 static void
9199 list_commands(FILE *fp)
9200 {
9201 	size_t i;
9202 
9203 	fprintf(fp, "commands:");
9204 	for (i = 0; i < nitems(tog_commands); i++) {
9205 		const struct tog_cmd *cmd = &tog_commands[i];
9206 		fprintf(fp, " %s", cmd->name);
9207 	}
9208 	fputc('\n', fp);
9209 }
9210 
9211 __dead static void
9212 usage(int hflag, int status)
9213 {
9214 	FILE *fp = (status == 0) ? stdout : stderr;
9215 
9216 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9217 	    getprogname());
9218 	if (hflag) {
9219 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9220 		list_commands(fp);
9221 	}
9222 	exit(status);
9223 }
9224 
9225 static char **
9226 make_argv(int argc, ...)
9227 {
9228 	va_list ap;
9229 	char **argv;
9230 	int i;
9231 
9232 	va_start(ap, argc);
9233 
9234 	argv = calloc(argc, sizeof(char *));
9235 	if (argv == NULL)
9236 		err(1, "calloc");
9237 	for (i = 0; i < argc; i++) {
9238 		argv[i] = strdup(va_arg(ap, char *));
9239 		if (argv[i] == NULL)
9240 			err(1, "strdup");
9241 	}
9242 
9243 	va_end(ap);
9244 	return argv;
9245 }
9246 
9247 /*
9248  * Try to convert 'tog path' into a 'tog log path' command.
9249  * The user could simply have mistyped the command rather than knowingly
9250  * provided a path. So check whether argv[0] can in fact be resolved
9251  * to a path in the HEAD commit and print a special error if not.
9252  * This hack is for mpi@ <3
9253  */
9254 static const struct got_error *
9255 tog_log_with_path(int argc, char *argv[])
9256 {
9257 	const struct got_error *error = NULL, *close_err;
9258 	const struct tog_cmd *cmd = NULL;
9259 	struct got_repository *repo = NULL;
9260 	struct got_worktree *worktree = NULL;
9261 	struct got_object_id *commit_id = NULL, *id = NULL;
9262 	struct got_commit_object *commit = NULL;
9263 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9264 	char *commit_id_str = NULL, **cmd_argv = NULL;
9265 	int *pack_fds = NULL;
9266 
9267 	cwd = getcwd(NULL, 0);
9268 	if (cwd == NULL)
9269 		return got_error_from_errno("getcwd");
9270 
9271 	error = got_repo_pack_fds_open(&pack_fds);
9272 	if (error != NULL)
9273 		goto done;
9274 
9275 	error = got_worktree_open(&worktree, cwd);
9276 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9277 		goto done;
9278 
9279 	if (worktree)
9280 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9281 	else
9282 		repo_path = strdup(cwd);
9283 	if (repo_path == NULL) {
9284 		error = got_error_from_errno("strdup");
9285 		goto done;
9286 	}
9287 
9288 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9289 	if (error != NULL)
9290 		goto done;
9291 
9292 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9293 	    repo, worktree);
9294 	if (error)
9295 		goto done;
9296 
9297 	error = tog_load_refs(repo, 0);
9298 	if (error)
9299 		goto done;
9300 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9301 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9302 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9303 	if (error)
9304 		goto done;
9305 
9306 	if (worktree) {
9307 		got_worktree_close(worktree);
9308 		worktree = NULL;
9309 	}
9310 
9311 	error = got_object_open_as_commit(&commit, repo, commit_id);
9312 	if (error)
9313 		goto done;
9314 
9315 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9316 	if (error) {
9317 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9318 			goto done;
9319 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9320 		    getprogname(), argv[0]);
9321 		usage(1, 1);
9322 		/* not reached */
9323 	}
9324 
9325 	error = got_object_id_str(&commit_id_str, commit_id);
9326 	if (error)
9327 		goto done;
9328 
9329 	cmd = &tog_commands[0]; /* log */
9330 	argc = 4;
9331 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9332 	error = cmd->cmd_main(argc, cmd_argv);
9333 done:
9334 	if (repo) {
9335 		close_err = got_repo_close(repo);
9336 		if (error == NULL)
9337 			error = close_err;
9338 	}
9339 	if (commit)
9340 		got_object_commit_close(commit);
9341 	if (worktree)
9342 		got_worktree_close(worktree);
9343 	if (pack_fds) {
9344 		const struct got_error *pack_err =
9345 		    got_repo_pack_fds_close(pack_fds);
9346 		if (error == NULL)
9347 			error = pack_err;
9348 	}
9349 	free(id);
9350 	free(commit_id_str);
9351 	free(commit_id);
9352 	free(cwd);
9353 	free(repo_path);
9354 	free(in_repo_path);
9355 	if (cmd_argv) {
9356 		int i;
9357 		for (i = 0; i < argc; i++)
9358 			free(cmd_argv[i]);
9359 		free(cmd_argv);
9360 	}
9361 	tog_free_refs();
9362 	return error;
9363 }
9364 
9365 int
9366 main(int argc, char *argv[])
9367 {
9368 	const struct got_error *error = NULL;
9369 	const struct tog_cmd *cmd = NULL;
9370 	int ch, hflag = 0, Vflag = 0;
9371 	char **cmd_argv = NULL;
9372 	static const struct option longopts[] = {
9373 	    { "version", no_argument, NULL, 'V' },
9374 	    { NULL, 0, NULL, 0}
9375 	};
9376 	char *diff_algo_str = NULL;
9377 
9378 	if (!isatty(STDIN_FILENO))
9379 		errx(1, "standard input is not a tty");
9380 
9381 	setlocale(LC_CTYPE, "");
9382 
9383 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9384 		switch (ch) {
9385 		case 'h':
9386 			hflag = 1;
9387 			break;
9388 		case 'V':
9389 			Vflag = 1;
9390 			break;
9391 		default:
9392 			usage(hflag, 1);
9393 			/* NOTREACHED */
9394 		}
9395 	}
9396 
9397 	argc -= optind;
9398 	argv += optind;
9399 	optind = 1;
9400 	optreset = 1;
9401 
9402 	if (Vflag) {
9403 		got_version_print_str();
9404 		return 0;
9405 	}
9406 
9407 #ifndef PROFILE
9408 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9409 	    NULL) == -1)
9410 		err(1, "pledge");
9411 #endif
9412 
9413 	if (argc == 0) {
9414 		if (hflag)
9415 			usage(hflag, 0);
9416 		/* Build an argument vector which runs a default command. */
9417 		cmd = &tog_commands[0];
9418 		argc = 1;
9419 		cmd_argv = make_argv(argc, cmd->name);
9420 	} else {
9421 		size_t i;
9422 
9423 		/* Did the user specify a command? */
9424 		for (i = 0; i < nitems(tog_commands); i++) {
9425 			if (strncmp(tog_commands[i].name, argv[0],
9426 			    strlen(argv[0])) == 0) {
9427 				cmd = &tog_commands[i];
9428 				break;
9429 			}
9430 		}
9431 	}
9432 
9433 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9434 	if (diff_algo_str) {
9435 		if (strcasecmp(diff_algo_str, "patience") == 0)
9436 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9437 		if (strcasecmp(diff_algo_str, "myers") == 0)
9438 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9439 	}
9440 
9441 	if (cmd == NULL) {
9442 		if (argc != 1)
9443 			usage(0, 1);
9444 		/* No command specified; try log with a path */
9445 		error = tog_log_with_path(argc, argv);
9446 	} else {
9447 		if (hflag)
9448 			cmd->cmd_usage();
9449 		else
9450 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9451 	}
9452 
9453 	endwin();
9454 	putchar('\n');
9455 	if (cmd_argv) {
9456 		int i;
9457 		for (i = 0; i < argc; i++)
9458 			free(cmd_argv[i]);
9459 		free(cmd_argv);
9460 	}
9461 
9462 	if (error && error->code != GOT_ERR_CANCELLED &&
9463 	    error->code != GOT_ERR_EOF &&
9464 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9465 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9466 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9467 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9468 	return 0;
9469 }