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