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", "Go to line N (default: first line)"), \
542 	KEY_("Home =", "Go to the first line"), \
543 	KEY_("G", "Go to line N (default: last line)"), \
544 	KEY_("End *", "Go to the last line"), \
545 	KEY_("l Right", "Scroll the view right"), \
546 	KEY_("h Left", "Scroll the view left"), \
547 	KEY_("$", "Scroll view to the rightmost position"), \
548 	KEY_("0", "Scroll view to the leftmost position"), \
549 	KEY_("-", "Decrease size of the focussed split"), \
550 	KEY_("+", "Increase size of the focussed split"), \
551 	KEY_("Tab", "Switch focus between views"), \
552 	KEY_("F", "Toggle fullscreen mode"), \
553 	KEY_("/", "Open prompt to enter search term"), \
554 	KEY_("n", "Find next line/token matching the current search term"), \
555 	KEY_("N", "Find previous line/token matching the current search term"),\
556 	KEY_("q", "Quit the focussed view; Quit help screen"), \
557 	KEY_("Q", "Quit tog"), \
558 	\
559 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
560 	KEY_("< ,", "Move cursor up one commit"), \
561 	KEY_("> .", "Move cursor down one commit"), \
562 	KEY_("Enter", "Open diff view of the selected commit"), \
563 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
564 	KEY_("R", "Open ref view of all repository references"), \
565 	KEY_("T", "Display tree view of the repository from the selected" \
566 	    " commit"), \
567 	KEY_("@", "Toggle between displaying author and committer name"), \
568 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
569 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
570 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
571 	\
572 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
573 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
574 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
575 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
576 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
577 	    " data"), \
578 	KEY_("(", "Go to the previous file in the diff"), \
579 	KEY_(")", "Go to the next file in the diff"), \
580 	KEY_("{", "Go to the previous hunk in the diff"), \
581 	KEY_("}", "Go to the next hunk in the diff"), \
582 	KEY_("[", "Decrease the number of context lines"), \
583 	KEY_("]", "Increase the number of context lines"), \
584 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
585 	\
586 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
587 	KEY_("Enter", "Display diff view of the selected line's commit"), \
588 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
589 	KEY_("L", "Open log view for the currently selected annotated line"), \
590 	KEY_("C", "Reload view with the previously blamed commit"), \
591 	KEY_("c", "Reload view with the version of the file found in the" \
592 	    " selected line's commit"), \
593 	KEY_("p", "Reload view with the version of the file found in the" \
594 	    " selected line's parent commit"), \
595 	\
596 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
597 	KEY_("Enter", "Enter selected directory or open blame view of the" \
598 	    " selected file"), \
599 	KEY_("L", "Open log view for the selected entry"), \
600 	KEY_("R", "Open ref view of all repository references"), \
601 	KEY_("i", "Show object IDs for all tree entries"), \
602 	KEY_("Backspace", "Return to the parent directory"), \
603 	\
604 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
605 	KEY_("Enter", "Display log view of the selected reference"), \
606 	KEY_("T", "Display tree view of the selected reference"), \
607 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
608 	KEY_("m", "Toggle display of last modified date for each reference"), \
609 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
610 	KEY_("C-l", "Reload view with all repository references")
611 
612 struct tog_key_map {
613 	const char		*keys;
614 	const char		*info;
615 	enum tog_keymap_type	 type;
616 };
617 
618 /*
619  * We implement two types of views: parent views and child views.
620  *
621  * The 'Tab' key switches focus between a parent view and its child view.
622  * Child views are shown side-by-side to their parent view, provided
623  * there is enough screen estate.
624  *
625  * When a new view is opened from within a parent view, this new view
626  * becomes a child view of the parent view, replacing any existing child.
627  *
628  * When a new view is opened from within a child view, this new view
629  * becomes a parent view which will obscure the views below until the
630  * user quits the new parent view by typing 'q'.
631  *
632  * This list of views contains parent views only.
633  * Child views are only pointed to by their parent view.
634  */
635 TAILQ_HEAD(tog_view_list_head, tog_view);
636 
637 struct tog_view {
638 	TAILQ_ENTRY(tog_view) entry;
639 	WINDOW *window;
640 	PANEL *panel;
641 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
642 	int resized_y, resized_x; /* begin_y/x based on user resizing */
643 	int maxx, x; /* max column and current start column */
644 	int lines, cols; /* copies of LINES and COLS */
645 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
646 	int gline, hiline; /* navigate to and highlight this nG line */
647 	int ch, count; /* current keymap and count prefix */
648 	int resized; /* set when in a resize event */
649 	int focussed; /* Only set on one parent or child view at a time. */
650 	int dying;
651 	struct tog_view *parent;
652 	struct tog_view *child;
653 
654 	/*
655 	 * This flag is initially set on parent views when a new child view
656 	 * is created. It gets toggled when the 'Tab' key switches focus
657 	 * between parent and child.
658 	 * The flag indicates whether focus should be passed on to our child
659 	 * view if this parent view gets picked for focus after another parent
660 	 * view was closed. This prevents child views from losing focus in such
661 	 * situations.
662 	 */
663 	int focus_child;
664 
665 	enum tog_view_mode mode;
666 	/* type-specific state */
667 	enum tog_view_type type;
668 	union {
669 		struct tog_diff_view_state diff;
670 		struct tog_log_view_state log;
671 		struct tog_blame_view_state blame;
672 		struct tog_tree_view_state tree;
673 		struct tog_ref_view_state ref;
674 		struct tog_help_view_state help;
675 	} state;
676 
677 	const struct got_error *(*show)(struct tog_view *);
678 	const struct got_error *(*input)(struct tog_view **,
679 	    struct tog_view *, int);
680 	const struct got_error *(*reset)(struct tog_view *);
681 	const struct got_error *(*resize)(struct tog_view *, int);
682 	const struct got_error *(*close)(struct tog_view *);
683 
684 	const struct got_error *(*search_start)(struct tog_view *);
685 	const struct got_error *(*search_next)(struct tog_view *);
686 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
687 	    int **, int **, int **, int **);
688 	int search_started;
689 	int searching;
690 #define TOG_SEARCH_FORWARD	1
691 #define TOG_SEARCH_BACKWARD	2
692 	int search_next_done;
693 #define TOG_SEARCH_HAVE_MORE	1
694 #define TOG_SEARCH_NO_MORE	2
695 #define TOG_SEARCH_HAVE_NONE	3
696 	regex_t regex;
697 	regmatch_t regmatch;
698 };
699 
700 static const struct got_error *open_diff_view(struct tog_view *,
701     struct got_object_id *, struct got_object_id *,
702     const char *, const char *, int, int, int, struct tog_view *,
703     struct got_repository *);
704 static const struct got_error *show_diff_view(struct tog_view *);
705 static const struct got_error *input_diff_view(struct tog_view **,
706     struct tog_view *, int);
707 static const struct got_error *reset_diff_view(struct tog_view *);
708 static const struct got_error* close_diff_view(struct tog_view *);
709 static const struct got_error *search_start_diff_view(struct tog_view *);
710 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
711     size_t *, int **, int **, int **, int **);
712 static const struct got_error *search_next_view_match(struct tog_view *);
713 
714 static const struct got_error *open_log_view(struct tog_view *,
715     struct got_object_id *, struct got_repository *,
716     const char *, const char *, int);
717 static const struct got_error * show_log_view(struct tog_view *);
718 static const struct got_error *input_log_view(struct tog_view **,
719     struct tog_view *, int);
720 static const struct got_error *resize_log_view(struct tog_view *, int);
721 static const struct got_error *close_log_view(struct tog_view *);
722 static const struct got_error *search_start_log_view(struct tog_view *);
723 static const struct got_error *search_next_log_view(struct tog_view *);
724 
725 static const struct got_error *open_blame_view(struct tog_view *, char *,
726     struct got_object_id *, struct got_repository *);
727 static const struct got_error *show_blame_view(struct tog_view *);
728 static const struct got_error *input_blame_view(struct tog_view **,
729     struct tog_view *, int);
730 static const struct got_error *reset_blame_view(struct tog_view *);
731 static const struct got_error *close_blame_view(struct tog_view *);
732 static const struct got_error *search_start_blame_view(struct tog_view *);
733 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
734     size_t *, int **, int **, int **, int **);
735 
736 static const struct got_error *open_tree_view(struct tog_view *,
737     struct got_object_id *, const char *, struct got_repository *);
738 static const struct got_error *show_tree_view(struct tog_view *);
739 static const struct got_error *input_tree_view(struct tog_view **,
740     struct tog_view *, int);
741 static const struct got_error *close_tree_view(struct tog_view *);
742 static const struct got_error *search_start_tree_view(struct tog_view *);
743 static const struct got_error *search_next_tree_view(struct tog_view *);
744 
745 static const struct got_error *open_ref_view(struct tog_view *,
746     struct got_repository *);
747 static const struct got_error *show_ref_view(struct tog_view *);
748 static const struct got_error *input_ref_view(struct tog_view **,
749     struct tog_view *, int);
750 static const struct got_error *close_ref_view(struct tog_view *);
751 static const struct got_error *search_start_ref_view(struct tog_view *);
752 static const struct got_error *search_next_ref_view(struct tog_view *);
753 
754 static const struct got_error *open_help_view(struct tog_view *,
755     struct tog_view *);
756 static const struct got_error *show_help_view(struct tog_view *);
757 static const struct got_error *input_help_view(struct tog_view **,
758     struct tog_view *, int);
759 static const struct got_error *reset_help_view(struct tog_view *);
760 static const struct got_error* close_help_view(struct tog_view *);
761 static const struct got_error *search_start_help_view(struct tog_view *);
762 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
763     size_t *, int **, int **, int **, int **);
764 
765 static volatile sig_atomic_t tog_sigwinch_received;
766 static volatile sig_atomic_t tog_sigpipe_received;
767 static volatile sig_atomic_t tog_sigcont_received;
768 static volatile sig_atomic_t tog_sigint_received;
769 static volatile sig_atomic_t tog_sigterm_received;
770 
771 static void
772 tog_sigwinch(int signo)
773 {
774 	tog_sigwinch_received = 1;
775 }
776 
777 static void
778 tog_sigpipe(int signo)
779 {
780 	tog_sigpipe_received = 1;
781 }
782 
783 static void
784 tog_sigcont(int signo)
785 {
786 	tog_sigcont_received = 1;
787 }
788 
789 static void
790 tog_sigint(int signo)
791 {
792 	tog_sigint_received = 1;
793 }
794 
795 static void
796 tog_sigterm(int signo)
797 {
798 	tog_sigterm_received = 1;
799 }
800 
801 static int
802 tog_fatal_signal_received(void)
803 {
804 	return (tog_sigpipe_received ||
805 	    tog_sigint_received || tog_sigterm_received);
806 }
807 
808 static const struct got_error *
809 view_close(struct tog_view *view)
810 {
811 	const struct got_error *err = NULL, *child_err = NULL;
812 
813 	if (view->child) {
814 		child_err = view_close(view->child);
815 		view->child = NULL;
816 	}
817 	if (view->close)
818 		err = view->close(view);
819 	if (view->panel)
820 		del_panel(view->panel);
821 	if (view->window)
822 		delwin(view->window);
823 	free(view);
824 	return err ? err : child_err;
825 }
826 
827 static struct tog_view *
828 view_open(int nlines, int ncols, int begin_y, int begin_x,
829     enum tog_view_type type)
830 {
831 	struct tog_view *view = calloc(1, sizeof(*view));
832 
833 	if (view == NULL)
834 		return NULL;
835 
836 	view->type = type;
837 	view->lines = LINES;
838 	view->cols = COLS;
839 	view->nlines = nlines ? nlines : LINES - begin_y;
840 	view->ncols = ncols ? ncols : COLS - begin_x;
841 	view->begin_y = begin_y;
842 	view->begin_x = begin_x;
843 	view->window = newwin(nlines, ncols, begin_y, begin_x);
844 	if (view->window == NULL) {
845 		view_close(view);
846 		return NULL;
847 	}
848 	view->panel = new_panel(view->window);
849 	if (view->panel == NULL ||
850 	    set_panel_userptr(view->panel, view) != OK) {
851 		view_close(view);
852 		return NULL;
853 	}
854 
855 	keypad(view->window, TRUE);
856 	return view;
857 }
858 
859 static int
860 view_split_begin_x(int begin_x)
861 {
862 	if (begin_x > 0 || COLS < 120)
863 		return 0;
864 	return (COLS - MAX(COLS / 2, 80));
865 }
866 
867 /* XXX Stub till we decide what to do. */
868 static int
869 view_split_begin_y(int lines)
870 {
871 	return lines * HSPLIT_SCALE;
872 }
873 
874 static const struct got_error *view_resize(struct tog_view *);
875 
876 static const struct got_error *
877 view_splitscreen(struct tog_view *view)
878 {
879 	const struct got_error *err = NULL;
880 
881 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
882 		if (view->resized_y && view->resized_y < view->lines)
883 			view->begin_y = view->resized_y;
884 		else
885 			view->begin_y = view_split_begin_y(view->nlines);
886 		view->begin_x = 0;
887 	} else if (!view->resized) {
888 		if (view->resized_x && view->resized_x < view->cols - 1 &&
889 		    view->cols > 119)
890 			view->begin_x = view->resized_x;
891 		else
892 			view->begin_x = view_split_begin_x(0);
893 		view->begin_y = 0;
894 	}
895 	view->nlines = LINES - view->begin_y;
896 	view->ncols = COLS - view->begin_x;
897 	view->lines = LINES;
898 	view->cols = COLS;
899 	err = view_resize(view);
900 	if (err)
901 		return err;
902 
903 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
904 		view->parent->nlines = view->begin_y;
905 
906 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
907 		return got_error_from_errno("mvwin");
908 
909 	return NULL;
910 }
911 
912 static const struct got_error *
913 view_fullscreen(struct tog_view *view)
914 {
915 	const struct got_error *err = NULL;
916 
917 	view->begin_x = 0;
918 	view->begin_y = view->resized ? view->begin_y : 0;
919 	view->nlines = view->resized ? view->nlines : LINES;
920 	view->ncols = COLS;
921 	view->lines = LINES;
922 	view->cols = COLS;
923 	err = view_resize(view);
924 	if (err)
925 		return err;
926 
927 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
928 		return got_error_from_errno("mvwin");
929 
930 	return NULL;
931 }
932 
933 static int
934 view_is_parent_view(struct tog_view *view)
935 {
936 	return view->parent == NULL;
937 }
938 
939 static int
940 view_is_splitscreen(struct tog_view *view)
941 {
942 	return view->begin_x > 0 || view->begin_y > 0;
943 }
944 
945 static int
946 view_is_fullscreen(struct tog_view *view)
947 {
948 	return view->nlines == LINES && view->ncols == COLS;
949 }
950 
951 static int
952 view_is_hsplit_top(struct tog_view *view)
953 {
954 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
955 	    view_is_splitscreen(view->child);
956 }
957 
958 static void
959 view_border(struct tog_view *view)
960 {
961 	PANEL *panel;
962 	const struct tog_view *view_above;
963 
964 	if (view->parent)
965 		return view_border(view->parent);
966 
967 	panel = panel_above(view->panel);
968 	if (panel == NULL)
969 		return;
970 
971 	view_above = panel_userptr(panel);
972 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
973 		mvwhline(view->window, view_above->begin_y - 1,
974 		    view->begin_x, got_locale_is_utf8() ?
975 		    ACS_HLINE : '-', view->ncols);
976 	else
977 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
978 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
979 }
980 
981 static const struct got_error *view_init_hsplit(struct tog_view *, int);
982 static const struct got_error *request_log_commits(struct tog_view *);
983 static const struct got_error *offset_selection_down(struct tog_view *);
984 static void offset_selection_up(struct tog_view *);
985 static void view_get_split(struct tog_view *, int *, int *);
986 
987 static const struct got_error *
988 view_resize(struct tog_view *view)
989 {
990 	const struct got_error	*err = NULL;
991 	int			 dif, nlines, ncols;
992 
993 	dif = LINES - view->lines;  /* line difference */
994 
995 	if (view->lines > LINES)
996 		nlines = view->nlines - (view->lines - LINES);
997 	else
998 		nlines = view->nlines + (LINES - view->lines);
999 	if (view->cols > COLS)
1000 		ncols = view->ncols - (view->cols - COLS);
1001 	else
1002 		ncols = view->ncols + (COLS - view->cols);
1003 
1004 	if (view->child) {
1005 		int hs = view->child->begin_y;
1006 
1007 		if (!view_is_fullscreen(view))
1008 			view->child->begin_x = view_split_begin_x(view->begin_x);
1009 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1010 		    view->child->begin_x == 0) {
1011 			ncols = COLS;
1012 
1013 			view_fullscreen(view->child);
1014 			if (view->child->focussed)
1015 				show_panel(view->child->panel);
1016 			else
1017 				show_panel(view->panel);
1018 		} else {
1019 			ncols = view->child->begin_x;
1020 
1021 			view_splitscreen(view->child);
1022 			show_panel(view->child->panel);
1023 		}
1024 		/*
1025 		 * XXX This is ugly and needs to be moved into the above
1026 		 * logic but "works" for now and my attempts at moving it
1027 		 * break either 'tab' or 'F' key maps in horizontal splits.
1028 		 */
1029 		if (hs) {
1030 			err = view_splitscreen(view->child);
1031 			if (err)
1032 				return err;
1033 			if (dif < 0) { /* top split decreased */
1034 				err = offset_selection_down(view);
1035 				if (err)
1036 					return err;
1037 			}
1038 			view_border(view);
1039 			update_panels();
1040 			doupdate();
1041 			show_panel(view->child->panel);
1042 			nlines = view->nlines;
1043 		}
1044 	} else if (view->parent == NULL)
1045 		ncols = COLS;
1046 
1047 	if (view->resize && dif > 0) {
1048 		err = view->resize(view, dif);
1049 		if (err)
1050 			return err;
1051 	}
1052 
1053 	if (wresize(view->window, nlines, ncols) == ERR)
1054 		return got_error_from_errno("wresize");
1055 	if (replace_panel(view->panel, view->window) == ERR)
1056 		return got_error_from_errno("replace_panel");
1057 	wclear(view->window);
1058 
1059 	view->nlines = nlines;
1060 	view->ncols = ncols;
1061 	view->lines = LINES;
1062 	view->cols = COLS;
1063 
1064 	return NULL;
1065 }
1066 
1067 static const struct got_error *
1068 resize_log_view(struct tog_view *view, int increase)
1069 {
1070 	struct tog_log_view_state	*s = &view->state.log;
1071 	const struct got_error		*err = NULL;
1072 	int				 n = 0;
1073 
1074 	if (s->selected_entry)
1075 		n = s->selected_entry->idx + view->lines - s->selected;
1076 
1077 	/*
1078 	 * Request commits to account for the increased
1079 	 * height so we have enough to populate the view.
1080 	 */
1081 	if (s->commits->ncommits < n) {
1082 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1083 		err = request_log_commits(view);
1084 	}
1085 
1086 	return err;
1087 }
1088 
1089 static void
1090 view_adjust_offset(struct tog_view *view, int n)
1091 {
1092 	if (n == 0)
1093 		return;
1094 
1095 	if (view->parent && view->parent->offset) {
1096 		if (view->parent->offset + n >= 0)
1097 			view->parent->offset += n;
1098 		else
1099 			view->parent->offset = 0;
1100 	} else if (view->offset) {
1101 		if (view->offset - n >= 0)
1102 			view->offset -= n;
1103 		else
1104 			view->offset = 0;
1105 	}
1106 }
1107 
1108 static const struct got_error *
1109 view_resize_split(struct tog_view *view, int resize)
1110 {
1111 	const struct got_error	*err = NULL;
1112 	struct tog_view		*v = NULL;
1113 
1114 	if (view->parent)
1115 		v = view->parent;
1116 	else
1117 		v = view;
1118 
1119 	if (!v->child || !view_is_splitscreen(v->child))
1120 		return NULL;
1121 
1122 	v->resized = v->child->resized = resize;  /* lock for resize event */
1123 
1124 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1125 		if (v->child->resized_y)
1126 			v->child->begin_y = v->child->resized_y;
1127 		if (view->parent)
1128 			v->child->begin_y -= resize;
1129 		else
1130 			v->child->begin_y += resize;
1131 		if (v->child->begin_y < 3) {
1132 			view->count = 0;
1133 			v->child->begin_y = 3;
1134 		} else if (v->child->begin_y > LINES - 1) {
1135 			view->count = 0;
1136 			v->child->begin_y = LINES - 1;
1137 		}
1138 		v->ncols = COLS;
1139 		v->child->ncols = COLS;
1140 		view_adjust_offset(view, resize);
1141 		err = view_init_hsplit(v, v->child->begin_y);
1142 		if (err)
1143 			return err;
1144 		v->child->resized_y = v->child->begin_y;
1145 	} else {
1146 		if (v->child->resized_x)
1147 			v->child->begin_x = v->child->resized_x;
1148 		if (view->parent)
1149 			v->child->begin_x -= resize;
1150 		else
1151 			v->child->begin_x += resize;
1152 		if (v->child->begin_x < 11) {
1153 			view->count = 0;
1154 			v->child->begin_x = 11;
1155 		} else if (v->child->begin_x > COLS - 1) {
1156 			view->count = 0;
1157 			v->child->begin_x = COLS - 1;
1158 		}
1159 		v->child->resized_x = v->child->begin_x;
1160 	}
1161 
1162 	v->child->mode = v->mode;
1163 	v->child->nlines = v->lines - v->child->begin_y;
1164 	v->child->ncols = v->cols - v->child->begin_x;
1165 	v->focus_child = 1;
1166 
1167 	err = view_fullscreen(v);
1168 	if (err)
1169 		return err;
1170 	err = view_splitscreen(v->child);
1171 	if (err)
1172 		return err;
1173 
1174 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1175 		err = offset_selection_down(v->child);
1176 		if (err)
1177 			return err;
1178 	}
1179 
1180 	if (v->resize)
1181 		err = v->resize(v, 0);
1182 	else if (v->child->resize)
1183 		err = v->child->resize(v->child, 0);
1184 
1185 	v->resized = v->child->resized = 0;
1186 
1187 	return err;
1188 }
1189 
1190 static void
1191 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1192 {
1193 	struct tog_view *v = src->child ? src->child : src;
1194 
1195 	dst->resized_x = v->resized_x;
1196 	dst->resized_y = v->resized_y;
1197 }
1198 
1199 static const struct got_error *
1200 view_close_child(struct tog_view *view)
1201 {
1202 	const struct got_error *err = NULL;
1203 
1204 	if (view->child == NULL)
1205 		return NULL;
1206 
1207 	err = view_close(view->child);
1208 	view->child = NULL;
1209 	return err;
1210 }
1211 
1212 static const struct got_error *
1213 view_set_child(struct tog_view *view, struct tog_view *child)
1214 {
1215 	const struct got_error *err = NULL;
1216 
1217 	view->child = child;
1218 	child->parent = view;
1219 
1220 	err = view_resize(view);
1221 	if (err)
1222 		return err;
1223 
1224 	if (view->child->resized_x || view->child->resized_y)
1225 		err = view_resize_split(view, 0);
1226 
1227 	return err;
1228 }
1229 
1230 static const struct got_error *view_dispatch_request(struct tog_view **,
1231     struct tog_view *, enum tog_view_type, int, int);
1232 
1233 static const struct got_error *
1234 view_request_new(struct tog_view **requested, struct tog_view *view,
1235     enum tog_view_type request)
1236 {
1237 	struct tog_view		*new_view = NULL;
1238 	const struct got_error	*err;
1239 	int			 y = 0, x = 0;
1240 
1241 	*requested = NULL;
1242 
1243 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1244 		view_get_split(view, &y, &x);
1245 
1246 	err = view_dispatch_request(&new_view, view, request, y, x);
1247 	if (err)
1248 		return err;
1249 
1250 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1251 	    request != TOG_VIEW_HELP) {
1252 		err = view_init_hsplit(view, y);
1253 		if (err)
1254 			return err;
1255 	}
1256 
1257 	view->focussed = 0;
1258 	new_view->focussed = 1;
1259 	new_view->mode = view->mode;
1260 	new_view->nlines = request == TOG_VIEW_HELP ?
1261 	    view->lines : view->lines - y;
1262 
1263 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1264 		view_transfer_size(new_view, view);
1265 		err = view_close_child(view);
1266 		if (err)
1267 			return err;
1268 		err = view_set_child(view, new_view);
1269 		if (err)
1270 			return err;
1271 		view->focus_child = 1;
1272 	} else
1273 		*requested = new_view;
1274 
1275 	return NULL;
1276 }
1277 
1278 static void
1279 tog_resizeterm(void)
1280 {
1281 	int cols, lines;
1282 	struct winsize size;
1283 
1284 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1285 		cols = 80;     /* Default */
1286 		lines = 24;
1287 	} else {
1288 		cols = size.ws_col;
1289 		lines = size.ws_row;
1290 	}
1291 	resize_term(lines, cols);
1292 }
1293 
1294 static const struct got_error *
1295 view_search_start(struct tog_view *view)
1296 {
1297 	const struct got_error *err = NULL;
1298 	struct tog_view *v = view;
1299 	char pattern[1024];
1300 	int ret;
1301 
1302 	if (view->search_started) {
1303 		regfree(&view->regex);
1304 		view->searching = 0;
1305 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1306 	}
1307 	view->search_started = 0;
1308 
1309 	if (view->nlines < 1)
1310 		return NULL;
1311 
1312 	if (view_is_hsplit_top(view))
1313 		v = view->child;
1314 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1315 		v = view->parent;
1316 
1317 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1318 	wclrtoeol(v->window);
1319 
1320 	nodelay(v->window, FALSE);  /* block for search term input */
1321 	nocbreak();
1322 	echo();
1323 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1324 	wrefresh(v->window);
1325 	cbreak();
1326 	noecho();
1327 	nodelay(v->window, TRUE);
1328 	if (ret == ERR)
1329 		return NULL;
1330 
1331 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1332 		err = view->search_start(view);
1333 		if (err) {
1334 			regfree(&view->regex);
1335 			return err;
1336 		}
1337 		view->search_started = 1;
1338 		view->searching = TOG_SEARCH_FORWARD;
1339 		view->search_next_done = 0;
1340 		view->search_next(view);
1341 	}
1342 
1343 	return NULL;
1344 }
1345 
1346 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1347 static const struct got_error *
1348 switch_split(struct tog_view *view)
1349 {
1350 	const struct got_error	*err = NULL;
1351 	struct tog_view		*v = NULL;
1352 
1353 	if (view->parent)
1354 		v = view->parent;
1355 	else
1356 		v = view;
1357 
1358 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1359 		v->mode = TOG_VIEW_SPLIT_VERT;
1360 	else
1361 		v->mode = TOG_VIEW_SPLIT_HRZN;
1362 
1363 	if (!v->child)
1364 		return NULL;
1365 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1366 		v->mode = TOG_VIEW_SPLIT_NONE;
1367 
1368 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1369 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1370 		v->child->begin_y = v->child->resized_y;
1371 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1372 		v->child->begin_x = v->child->resized_x;
1373 
1374 
1375 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1376 		v->ncols = COLS;
1377 		v->child->ncols = COLS;
1378 		v->child->nscrolled = LINES - v->child->nlines;
1379 
1380 		err = view_init_hsplit(v, v->child->begin_y);
1381 		if (err)
1382 			return err;
1383 	}
1384 	v->child->mode = v->mode;
1385 	v->child->nlines = v->lines - v->child->begin_y;
1386 	v->focus_child = 1;
1387 
1388 	err = view_fullscreen(v);
1389 	if (err)
1390 		return err;
1391 	err = view_splitscreen(v->child);
1392 	if (err)
1393 		return err;
1394 
1395 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1396 		v->mode = TOG_VIEW_SPLIT_VERT;
1397 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1398 		err = offset_selection_down(v);
1399 		if (err)
1400 			return err;
1401 		err = offset_selection_down(v->child);
1402 		if (err)
1403 			return err;
1404 	} else {
1405 		offset_selection_up(v);
1406 		offset_selection_up(v->child);
1407 	}
1408 	if (v->resize)
1409 		err = v->resize(v, 0);
1410 	else if (v->child->resize)
1411 		err = v->child->resize(v->child, 0);
1412 
1413 	return err;
1414 }
1415 
1416 /*
1417  * Compute view->count from numeric input. Assign total to view->count and
1418  * return first non-numeric key entered.
1419  */
1420 static int
1421 get_compound_key(struct tog_view *view, int c)
1422 {
1423 	struct tog_view	*v = view;
1424 	int		 x, n = 0;
1425 
1426 	if (view_is_hsplit_top(view))
1427 		v = view->child;
1428 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1429 		v = view->parent;
1430 
1431 	view->count = 0;
1432 	cbreak();  /* block for input */
1433 	nodelay(view->window, FALSE);
1434 	wmove(v->window, v->nlines - 1, 0);
1435 	wclrtoeol(v->window);
1436 	waddch(v->window, ':');
1437 
1438 	do {
1439 		x = getcurx(v->window);
1440 		if (x != ERR && x < view->ncols) {
1441 			waddch(v->window, c);
1442 			wrefresh(v->window);
1443 		}
1444 
1445 		/*
1446 		 * Don't overflow. Max valid request should be the greatest
1447 		 * between the longest and total lines; cap at 10 million.
1448 		 */
1449 		if (n >= 9999999)
1450 			n = 9999999;
1451 		else
1452 			n = n * 10 + (c - '0');
1453 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1454 
1455 	if (c == 'G' || c == 'g') {	/* nG key map */
1456 		view->gline = view->hiline = n;
1457 		n = 0;
1458 		c = 0;
1459 	}
1460 
1461 	/* Massage excessive or inapplicable values at the input handler. */
1462 	view->count = n;
1463 
1464 	return c;
1465 }
1466 
1467 static const struct got_error *
1468 view_input(struct tog_view **new, int *done, struct tog_view *view,
1469     struct tog_view_list_head *views)
1470 {
1471 	const struct got_error *err = NULL;
1472 	struct tog_view *v;
1473 	int ch, errcode;
1474 
1475 	*new = NULL;
1476 
1477 	/* Clear "no matches" indicator. */
1478 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1479 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1480 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1481 		view->count = 0;
1482 	}
1483 
1484 	if (view->searching && !view->search_next_done) {
1485 		errcode = pthread_mutex_unlock(&tog_mutex);
1486 		if (errcode)
1487 			return got_error_set_errno(errcode,
1488 			    "pthread_mutex_unlock");
1489 		sched_yield();
1490 		errcode = pthread_mutex_lock(&tog_mutex);
1491 		if (errcode)
1492 			return got_error_set_errno(errcode,
1493 			    "pthread_mutex_lock");
1494 		view->search_next(view);
1495 		return NULL;
1496 	}
1497 
1498 	/* Allow threads to make progress while we are waiting for input. */
1499 	errcode = pthread_mutex_unlock(&tog_mutex);
1500 	if (errcode)
1501 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1502 	/* If we have an unfinished count, let C-g or backspace abort. */
1503 	if (view->count && --view->count) {
1504 		cbreak();
1505 		nodelay(view->window, TRUE);
1506 		ch = wgetch(view->window);
1507 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1508 			view->count = 0;
1509 		else
1510 			ch = view->ch;
1511 	} else {
1512 		ch = wgetch(view->window);
1513 		if (ch >= '1' && ch  <= '9')
1514 			view->ch = ch = get_compound_key(view, ch);
1515 	}
1516 	if (view->hiline && ch != ERR && ch != 0)
1517 		view->hiline = 0;  /* key pressed, clear line highlight */
1518 	nodelay(view->window, TRUE);
1519 	errcode = pthread_mutex_lock(&tog_mutex);
1520 	if (errcode)
1521 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1522 
1523 	if (tog_sigwinch_received || tog_sigcont_received) {
1524 		tog_resizeterm();
1525 		tog_sigwinch_received = 0;
1526 		tog_sigcont_received = 0;
1527 		TAILQ_FOREACH(v, views, entry) {
1528 			err = view_resize(v);
1529 			if (err)
1530 				return err;
1531 			err = v->input(new, v, KEY_RESIZE);
1532 			if (err)
1533 				return err;
1534 			if (v->child) {
1535 				err = view_resize(v->child);
1536 				if (err)
1537 					return err;
1538 				err = v->child->input(new, v->child,
1539 				    KEY_RESIZE);
1540 				if (err)
1541 					return err;
1542 				if (v->child->resized_x || v->child->resized_y) {
1543 					err = view_resize_split(v, 0);
1544 					if (err)
1545 						return err;
1546 				}
1547 			}
1548 		}
1549 	}
1550 
1551 	switch (ch) {
1552 	case '?':
1553 	case 'H':
1554 	case KEY_F(1):
1555 		if (view->type == TOG_VIEW_HELP)
1556 			err = view->reset(view);
1557 		else
1558 			err = view_request_new(new, view, TOG_VIEW_HELP);
1559 		break;
1560 	case '\t':
1561 		view->count = 0;
1562 		if (view->child) {
1563 			view->focussed = 0;
1564 			view->child->focussed = 1;
1565 			view->focus_child = 1;
1566 		} else if (view->parent) {
1567 			view->focussed = 0;
1568 			view->parent->focussed = 1;
1569 			view->parent->focus_child = 0;
1570 			if (!view_is_splitscreen(view)) {
1571 				if (view->parent->resize) {
1572 					err = view->parent->resize(view->parent,
1573 					    0);
1574 					if (err)
1575 						return err;
1576 				}
1577 				offset_selection_up(view->parent);
1578 				err = view_fullscreen(view->parent);
1579 				if (err)
1580 					return err;
1581 			}
1582 		}
1583 		break;
1584 	case 'q':
1585 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1586 			if (view->parent->resize) {
1587 				/* might need more commits to fill fullscreen */
1588 				err = view->parent->resize(view->parent, 0);
1589 				if (err)
1590 					break;
1591 			}
1592 			offset_selection_up(view->parent);
1593 		}
1594 		err = view->input(new, view, ch);
1595 		view->dying = 1;
1596 		break;
1597 	case 'Q':
1598 		*done = 1;
1599 		break;
1600 	case 'F':
1601 		view->count = 0;
1602 		if (view_is_parent_view(view)) {
1603 			if (view->child == NULL)
1604 				break;
1605 			if (view_is_splitscreen(view->child)) {
1606 				view->focussed = 0;
1607 				view->child->focussed = 1;
1608 				err = view_fullscreen(view->child);
1609 			} else {
1610 				err = view_splitscreen(view->child);
1611 				if (!err)
1612 					err = view_resize_split(view, 0);
1613 			}
1614 			if (err)
1615 				break;
1616 			err = view->child->input(new, view->child,
1617 			    KEY_RESIZE);
1618 		} else {
1619 			if (view_is_splitscreen(view)) {
1620 				view->parent->focussed = 0;
1621 				view->focussed = 1;
1622 				err = view_fullscreen(view);
1623 			} else {
1624 				err = view_splitscreen(view);
1625 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1626 					err = view_resize(view->parent);
1627 				if (!err)
1628 					err = view_resize_split(view, 0);
1629 			}
1630 			if (err)
1631 				break;
1632 			err = view->input(new, view, KEY_RESIZE);
1633 		}
1634 		if (err)
1635 			break;
1636 		if (view->resize) {
1637 			err = view->resize(view, 0);
1638 			if (err)
1639 				break;
1640 		}
1641 		if (view->parent)
1642 			err = offset_selection_down(view->parent);
1643 		if (!err)
1644 			err = offset_selection_down(view);
1645 		break;
1646 	case 'S':
1647 		view->count = 0;
1648 		err = switch_split(view);
1649 		break;
1650 	case '-':
1651 		err = view_resize_split(view, -1);
1652 		break;
1653 	case '+':
1654 		err = view_resize_split(view, 1);
1655 		break;
1656 	case KEY_RESIZE:
1657 		break;
1658 	case '/':
1659 		view->count = 0;
1660 		if (view->search_start)
1661 			view_search_start(view);
1662 		else
1663 			err = view->input(new, view, ch);
1664 		break;
1665 	case 'N':
1666 	case 'n':
1667 		if (view->search_started && view->search_next) {
1668 			view->searching = (ch == 'n' ?
1669 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1670 			view->search_next_done = 0;
1671 			view->search_next(view);
1672 		} else
1673 			err = view->input(new, view, ch);
1674 		break;
1675 	case 'A':
1676 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1677 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1678 		else
1679 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1680 		TAILQ_FOREACH(v, views, entry) {
1681 			if (v->reset) {
1682 				err = v->reset(v);
1683 				if (err)
1684 					return err;
1685 			}
1686 			if (v->child && v->child->reset) {
1687 				err = v->child->reset(v->child);
1688 				if (err)
1689 					return err;
1690 			}
1691 		}
1692 		break;
1693 	default:
1694 		err = view->input(new, view, ch);
1695 		break;
1696 	}
1697 
1698 	return err;
1699 }
1700 
1701 static int
1702 view_needs_focus_indication(struct tog_view *view)
1703 {
1704 	if (view_is_parent_view(view)) {
1705 		if (view->child == NULL || view->child->focussed)
1706 			return 0;
1707 		if (!view_is_splitscreen(view->child))
1708 			return 0;
1709 	} else if (!view_is_splitscreen(view))
1710 		return 0;
1711 
1712 	return view->focussed;
1713 }
1714 
1715 static const struct got_error *
1716 view_loop(struct tog_view *view)
1717 {
1718 	const struct got_error *err = NULL;
1719 	struct tog_view_list_head views;
1720 	struct tog_view *new_view;
1721 	char *mode;
1722 	int fast_refresh = 10;
1723 	int done = 0, errcode;
1724 
1725 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1726 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1727 		view->mode = TOG_VIEW_SPLIT_VERT;
1728 	else
1729 		view->mode = TOG_VIEW_SPLIT_HRZN;
1730 
1731 	errcode = pthread_mutex_lock(&tog_mutex);
1732 	if (errcode)
1733 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1734 
1735 	TAILQ_INIT(&views);
1736 	TAILQ_INSERT_HEAD(&views, view, entry);
1737 
1738 	view->focussed = 1;
1739 	err = view->show(view);
1740 	if (err)
1741 		return err;
1742 	update_panels();
1743 	doupdate();
1744 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1745 	    !tog_fatal_signal_received()) {
1746 		/* Refresh fast during initialization, then become slower. */
1747 		if (fast_refresh && fast_refresh-- == 0)
1748 			halfdelay(10); /* switch to once per second */
1749 
1750 		err = view_input(&new_view, &done, view, &views);
1751 		if (err)
1752 			break;
1753 		if (view->dying) {
1754 			struct tog_view *v, *prev = NULL;
1755 
1756 			if (view_is_parent_view(view))
1757 				prev = TAILQ_PREV(view, tog_view_list_head,
1758 				    entry);
1759 			else if (view->parent)
1760 				prev = view->parent;
1761 
1762 			if (view->parent) {
1763 				view->parent->child = NULL;
1764 				view->parent->focus_child = 0;
1765 				/* Restore fullscreen line height. */
1766 				view->parent->nlines = view->parent->lines;
1767 				err = view_resize(view->parent);
1768 				if (err)
1769 					break;
1770 				/* Make resized splits persist. */
1771 				view_transfer_size(view->parent, view);
1772 			} else
1773 				TAILQ_REMOVE(&views, view, entry);
1774 
1775 			err = view_close(view);
1776 			if (err)
1777 				goto done;
1778 
1779 			view = NULL;
1780 			TAILQ_FOREACH(v, &views, entry) {
1781 				if (v->focussed)
1782 					break;
1783 			}
1784 			if (view == NULL && new_view == NULL) {
1785 				/* No view has focus. Try to pick one. */
1786 				if (prev)
1787 					view = prev;
1788 				else if (!TAILQ_EMPTY(&views)) {
1789 					view = TAILQ_LAST(&views,
1790 					    tog_view_list_head);
1791 				}
1792 				if (view) {
1793 					if (view->focus_child) {
1794 						view->child->focussed = 1;
1795 						view = view->child;
1796 					} else
1797 						view->focussed = 1;
1798 				}
1799 			}
1800 		}
1801 		if (new_view) {
1802 			struct tog_view *v, *t;
1803 			/* Only allow one parent view per type. */
1804 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1805 				if (v->type != new_view->type)
1806 					continue;
1807 				TAILQ_REMOVE(&views, v, entry);
1808 				err = view_close(v);
1809 				if (err)
1810 					goto done;
1811 				break;
1812 			}
1813 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1814 			view = new_view;
1815 		}
1816 		if (view) {
1817 			if (view_is_parent_view(view)) {
1818 				if (view->child && view->child->focussed)
1819 					view = view->child;
1820 			} else {
1821 				if (view->parent && view->parent->focussed)
1822 					view = view->parent;
1823 			}
1824 			show_panel(view->panel);
1825 			if (view->child && view_is_splitscreen(view->child))
1826 				show_panel(view->child->panel);
1827 			if (view->parent && view_is_splitscreen(view)) {
1828 				err = view->parent->show(view->parent);
1829 				if (err)
1830 					goto done;
1831 			}
1832 			err = view->show(view);
1833 			if (err)
1834 				goto done;
1835 			if (view->child) {
1836 				err = view->child->show(view->child);
1837 				if (err)
1838 					goto done;
1839 			}
1840 			update_panels();
1841 			doupdate();
1842 		}
1843 	}
1844 done:
1845 	while (!TAILQ_EMPTY(&views)) {
1846 		const struct got_error *close_err;
1847 		view = TAILQ_FIRST(&views);
1848 		TAILQ_REMOVE(&views, view, entry);
1849 		close_err = view_close(view);
1850 		if (close_err && err == NULL)
1851 			err = close_err;
1852 	}
1853 
1854 	errcode = pthread_mutex_unlock(&tog_mutex);
1855 	if (errcode && err == NULL)
1856 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1857 
1858 	return err;
1859 }
1860 
1861 __dead static void
1862 usage_log(void)
1863 {
1864 	endwin();
1865 	fprintf(stderr,
1866 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1867 	    getprogname());
1868 	exit(1);
1869 }
1870 
1871 /* Create newly allocated wide-character string equivalent to a byte string. */
1872 static const struct got_error *
1873 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1874 {
1875 	char *vis = NULL;
1876 	const struct got_error *err = NULL;
1877 
1878 	*ws = NULL;
1879 	*wlen = mbstowcs(NULL, s, 0);
1880 	if (*wlen == (size_t)-1) {
1881 		int vislen;
1882 		if (errno != EILSEQ)
1883 			return got_error_from_errno("mbstowcs");
1884 
1885 		/* byte string invalid in current encoding; try to "fix" it */
1886 		err = got_mbsavis(&vis, &vislen, s);
1887 		if (err)
1888 			return err;
1889 		*wlen = mbstowcs(NULL, vis, 0);
1890 		if (*wlen == (size_t)-1) {
1891 			err = got_error_from_errno("mbstowcs"); /* give up */
1892 			goto done;
1893 		}
1894 	}
1895 
1896 	*ws = calloc(*wlen + 1, sizeof(**ws));
1897 	if (*ws == NULL) {
1898 		err = got_error_from_errno("calloc");
1899 		goto done;
1900 	}
1901 
1902 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1903 		err = got_error_from_errno("mbstowcs");
1904 done:
1905 	free(vis);
1906 	if (err) {
1907 		free(*ws);
1908 		*ws = NULL;
1909 		*wlen = 0;
1910 	}
1911 	return err;
1912 }
1913 
1914 static const struct got_error *
1915 expand_tab(char **ptr, const char *src)
1916 {
1917 	char	*dst;
1918 	size_t	 len, n, idx = 0, sz = 0;
1919 
1920 	*ptr = NULL;
1921 	n = len = strlen(src);
1922 	dst = malloc(n + 1);
1923 	if (dst == NULL)
1924 		return got_error_from_errno("malloc");
1925 
1926 	while (idx < len && src[idx]) {
1927 		const char c = src[idx];
1928 
1929 		if (c == '\t') {
1930 			size_t nb = TABSIZE - sz % TABSIZE;
1931 			char *p;
1932 
1933 			p = realloc(dst, n + nb);
1934 			if (p == NULL) {
1935 				free(dst);
1936 				return got_error_from_errno("realloc");
1937 
1938 			}
1939 			dst = p;
1940 			n += nb;
1941 			memset(dst + sz, ' ', nb);
1942 			sz += nb;
1943 		} else
1944 			dst[sz++] = src[idx];
1945 		++idx;
1946 	}
1947 
1948 	dst[sz] = '\0';
1949 	*ptr = dst;
1950 	return NULL;
1951 }
1952 
1953 /*
1954  * Advance at most n columns from wline starting at offset off.
1955  * Return the index to the first character after the span operation.
1956  * Return the combined column width of all spanned wide character in
1957  * *rcol.
1958  */
1959 static int
1960 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1961 {
1962 	int width, i, cols = 0;
1963 
1964 	if (n == 0) {
1965 		*rcol = cols;
1966 		return off;
1967 	}
1968 
1969 	for (i = off; wline[i] != L'\0'; ++i) {
1970 		if (wline[i] == L'\t')
1971 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1972 		else
1973 			width = wcwidth(wline[i]);
1974 
1975 		if (width == -1) {
1976 			width = 1;
1977 			wline[i] = L'.';
1978 		}
1979 
1980 		if (cols + width > n)
1981 			break;
1982 		cols += width;
1983 	}
1984 
1985 	*rcol = cols;
1986 	return i;
1987 }
1988 
1989 /*
1990  * Format a line for display, ensuring that it won't overflow a width limit.
1991  * With scrolling, the width returned refers to the scrolled version of the
1992  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1993  */
1994 static const struct got_error *
1995 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1996     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1997 {
1998 	const struct got_error *err = NULL;
1999 	int cols;
2000 	wchar_t *wline = NULL;
2001 	char *exstr = NULL;
2002 	size_t wlen;
2003 	int i, scrollx;
2004 
2005 	*wlinep = NULL;
2006 	*widthp = 0;
2007 
2008 	if (expand) {
2009 		err = expand_tab(&exstr, line);
2010 		if (err)
2011 			return err;
2012 	}
2013 
2014 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2015 	free(exstr);
2016 	if (err)
2017 		return err;
2018 
2019 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2020 
2021 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2022 		wline[wlen - 1] = L'\0';
2023 		wlen--;
2024 	}
2025 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2026 		wline[wlen - 1] = L'\0';
2027 		wlen--;
2028 	}
2029 
2030 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2031 	wline[i] = L'\0';
2032 
2033 	if (widthp)
2034 		*widthp = cols;
2035 	if (scrollxp)
2036 		*scrollxp = scrollx;
2037 	if (err)
2038 		free(wline);
2039 	else
2040 		*wlinep = wline;
2041 	return err;
2042 }
2043 
2044 static const struct got_error*
2045 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2046     struct got_object_id *id, struct got_repository *repo)
2047 {
2048 	static const struct got_error *err = NULL;
2049 	struct got_reflist_entry *re;
2050 	char *s;
2051 	const char *name;
2052 
2053 	*refs_str = NULL;
2054 
2055 	TAILQ_FOREACH(re, refs, entry) {
2056 		struct got_tag_object *tag = NULL;
2057 		struct got_object_id *ref_id;
2058 		int cmp;
2059 
2060 		name = got_ref_get_name(re->ref);
2061 		if (strcmp(name, GOT_REF_HEAD) == 0)
2062 			continue;
2063 		if (strncmp(name, "refs/", 5) == 0)
2064 			name += 5;
2065 		if (strncmp(name, "got/", 4) == 0 &&
2066 		    strncmp(name, "got/backup/", 11) != 0)
2067 			continue;
2068 		if (strncmp(name, "heads/", 6) == 0)
2069 			name += 6;
2070 		if (strncmp(name, "remotes/", 8) == 0) {
2071 			name += 8;
2072 			s = strstr(name, "/" GOT_REF_HEAD);
2073 			if (s != NULL && s[strlen(s)] == '\0')
2074 				continue;
2075 		}
2076 		err = got_ref_resolve(&ref_id, repo, re->ref);
2077 		if (err)
2078 			break;
2079 		if (strncmp(name, "tags/", 5) == 0) {
2080 			err = got_object_open_as_tag(&tag, repo, ref_id);
2081 			if (err) {
2082 				if (err->code != GOT_ERR_OBJ_TYPE) {
2083 					free(ref_id);
2084 					break;
2085 				}
2086 				/* Ref points at something other than a tag. */
2087 				err = NULL;
2088 				tag = NULL;
2089 			}
2090 		}
2091 		cmp = got_object_id_cmp(tag ?
2092 		    got_object_tag_get_object_id(tag) : ref_id, id);
2093 		free(ref_id);
2094 		if (tag)
2095 			got_object_tag_close(tag);
2096 		if (cmp != 0)
2097 			continue;
2098 		s = *refs_str;
2099 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2100 		    s ? ", " : "", name) == -1) {
2101 			err = got_error_from_errno("asprintf");
2102 			free(s);
2103 			*refs_str = NULL;
2104 			break;
2105 		}
2106 		free(s);
2107 	}
2108 
2109 	return err;
2110 }
2111 
2112 static const struct got_error *
2113 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2114     int col_tab_align)
2115 {
2116 	char *smallerthan;
2117 
2118 	smallerthan = strchr(author, '<');
2119 	if (smallerthan && smallerthan[1] != '\0')
2120 		author = smallerthan + 1;
2121 	author[strcspn(author, "@>")] = '\0';
2122 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2123 	    col_tab_align, 0);
2124 }
2125 
2126 static const struct got_error *
2127 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2128     struct got_object_id *id, const size_t date_display_cols,
2129     int author_display_cols)
2130 {
2131 	struct tog_log_view_state *s = &view->state.log;
2132 	const struct got_error *err = NULL;
2133 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2134 	char *logmsg0 = NULL, *logmsg = NULL;
2135 	char *author = NULL;
2136 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2137 	int author_width, logmsg_width;
2138 	char *newline, *line = NULL;
2139 	int col, limit, scrollx;
2140 	const int avail = view->ncols;
2141 	struct tm tm;
2142 	time_t committer_time;
2143 	struct tog_color *tc;
2144 
2145 	committer_time = got_object_commit_get_committer_time(commit);
2146 	if (gmtime_r(&committer_time, &tm) == NULL)
2147 		return got_error_from_errno("gmtime_r");
2148 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2149 		return got_error(GOT_ERR_NO_SPACE);
2150 
2151 	if (avail <= date_display_cols)
2152 		limit = MIN(sizeof(datebuf) - 1, avail);
2153 	else
2154 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2155 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2156 	if (tc)
2157 		wattr_on(view->window,
2158 		    COLOR_PAIR(tc->colorpair), NULL);
2159 	waddnstr(view->window, datebuf, limit);
2160 	if (tc)
2161 		wattr_off(view->window,
2162 		    COLOR_PAIR(tc->colorpair), NULL);
2163 	col = limit;
2164 	if (col > avail)
2165 		goto done;
2166 
2167 	if (avail >= 120) {
2168 		char *id_str;
2169 		err = got_object_id_str(&id_str, id);
2170 		if (err)
2171 			goto done;
2172 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2173 		if (tc)
2174 			wattr_on(view->window,
2175 			    COLOR_PAIR(tc->colorpair), NULL);
2176 		wprintw(view->window, "%.8s ", id_str);
2177 		if (tc)
2178 			wattr_off(view->window,
2179 			    COLOR_PAIR(tc->colorpair), NULL);
2180 		free(id_str);
2181 		col += 9;
2182 		if (col > avail)
2183 			goto done;
2184 	}
2185 
2186 	if (s->use_committer)
2187 		author = strdup(got_object_commit_get_committer(commit));
2188 	else
2189 		author = strdup(got_object_commit_get_author(commit));
2190 	if (author == NULL) {
2191 		err = got_error_from_errno("strdup");
2192 		goto done;
2193 	}
2194 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2195 	if (err)
2196 		goto done;
2197 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2198 	if (tc)
2199 		wattr_on(view->window,
2200 		    COLOR_PAIR(tc->colorpair), NULL);
2201 	waddwstr(view->window, wauthor);
2202 	col += author_width;
2203 	while (col < avail && author_width < author_display_cols + 2) {
2204 		waddch(view->window, ' ');
2205 		col++;
2206 		author_width++;
2207 	}
2208 	if (tc)
2209 		wattr_off(view->window,
2210 		    COLOR_PAIR(tc->colorpair), NULL);
2211 	if (col > avail)
2212 		goto done;
2213 
2214 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2215 	if (err)
2216 		goto done;
2217 	logmsg = logmsg0;
2218 	while (*logmsg == '\n')
2219 		logmsg++;
2220 	newline = strchr(logmsg, '\n');
2221 	if (newline)
2222 		*newline = '\0';
2223 	limit = avail - col;
2224 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2225 		limit--;	/* for the border */
2226 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2227 	    limit, col, 1);
2228 	if (err)
2229 		goto done;
2230 	waddwstr(view->window, &wlogmsg[scrollx]);
2231 	col += MAX(logmsg_width, 0);
2232 	while (col < avail) {
2233 		waddch(view->window, ' ');
2234 		col++;
2235 	}
2236 done:
2237 	free(logmsg0);
2238 	free(wlogmsg);
2239 	free(author);
2240 	free(wauthor);
2241 	free(line);
2242 	return err;
2243 }
2244 
2245 static struct commit_queue_entry *
2246 alloc_commit_queue_entry(struct got_commit_object *commit,
2247     struct got_object_id *id)
2248 {
2249 	struct commit_queue_entry *entry;
2250 	struct got_object_id *dup;
2251 
2252 	entry = calloc(1, sizeof(*entry));
2253 	if (entry == NULL)
2254 		return NULL;
2255 
2256 	dup = got_object_id_dup(id);
2257 	if (dup == NULL) {
2258 		free(entry);
2259 		return NULL;
2260 	}
2261 
2262 	entry->id = dup;
2263 	entry->commit = commit;
2264 	return entry;
2265 }
2266 
2267 static void
2268 pop_commit(struct commit_queue *commits)
2269 {
2270 	struct commit_queue_entry *entry;
2271 
2272 	entry = TAILQ_FIRST(&commits->head);
2273 	TAILQ_REMOVE(&commits->head, entry, entry);
2274 	got_object_commit_close(entry->commit);
2275 	commits->ncommits--;
2276 	free(entry->id);
2277 	free(entry);
2278 }
2279 
2280 static void
2281 free_commits(struct commit_queue *commits)
2282 {
2283 	while (!TAILQ_EMPTY(&commits->head))
2284 		pop_commit(commits);
2285 }
2286 
2287 static const struct got_error *
2288 match_commit(int *have_match, struct got_object_id *id,
2289     struct got_commit_object *commit, regex_t *regex)
2290 {
2291 	const struct got_error *err = NULL;
2292 	regmatch_t regmatch;
2293 	char *id_str = NULL, *logmsg = NULL;
2294 
2295 	*have_match = 0;
2296 
2297 	err = got_object_id_str(&id_str, id);
2298 	if (err)
2299 		return err;
2300 
2301 	err = got_object_commit_get_logmsg(&logmsg, commit);
2302 	if (err)
2303 		goto done;
2304 
2305 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2306 	    &regmatch, 0) == 0 ||
2307 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2308 	    &regmatch, 0) == 0 ||
2309 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2310 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2311 		*have_match = 1;
2312 done:
2313 	free(id_str);
2314 	free(logmsg);
2315 	return err;
2316 }
2317 
2318 static const struct got_error *
2319 queue_commits(struct tog_log_thread_args *a)
2320 {
2321 	const struct got_error *err = NULL;
2322 
2323 	/*
2324 	 * We keep all commits open throughout the lifetime of the log
2325 	 * view in order to avoid having to re-fetch commits from disk
2326 	 * while updating the display.
2327 	 */
2328 	do {
2329 		struct got_object_id id;
2330 		struct got_commit_object *commit;
2331 		struct commit_queue_entry *entry;
2332 		int limit_match = 0;
2333 		int errcode;
2334 
2335 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2336 		    NULL, NULL);
2337 		if (err)
2338 			break;
2339 
2340 		err = got_object_open_as_commit(&commit, a->repo, &id);
2341 		if (err)
2342 			break;
2343 		entry = alloc_commit_queue_entry(commit, &id);
2344 		if (entry == NULL) {
2345 			err = got_error_from_errno("alloc_commit_queue_entry");
2346 			break;
2347 		}
2348 
2349 		errcode = pthread_mutex_lock(&tog_mutex);
2350 		if (errcode) {
2351 			err = got_error_set_errno(errcode,
2352 			    "pthread_mutex_lock");
2353 			break;
2354 		}
2355 
2356 		entry->idx = a->real_commits->ncommits;
2357 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2358 		a->real_commits->ncommits++;
2359 
2360 		if (*a->limiting) {
2361 			err = match_commit(&limit_match, &id, commit,
2362 			    a->limit_regex);
2363 			if (err)
2364 				break;
2365 
2366 			if (limit_match) {
2367 				struct commit_queue_entry *matched;
2368 
2369 				matched = alloc_commit_queue_entry(
2370 				    entry->commit, entry->id);
2371 				if (matched == NULL) {
2372 					err = got_error_from_errno(
2373 					    "alloc_commit_queue_entry");
2374 					break;
2375 				}
2376 				matched->commit = entry->commit;
2377 				got_object_commit_retain(entry->commit);
2378 
2379 				matched->idx = a->limit_commits->ncommits;
2380 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2381 				    matched, entry);
2382 				a->limit_commits->ncommits++;
2383 			}
2384 
2385 			/*
2386 			 * This is how we signal log_thread() that we
2387 			 * have found a match, and that it should be
2388 			 * counted as a new entry for the view.
2389 			 */
2390 			a->limit_match = limit_match;
2391 		}
2392 
2393 		if (*a->searching == TOG_SEARCH_FORWARD &&
2394 		    !*a->search_next_done) {
2395 			int have_match;
2396 			err = match_commit(&have_match, &id, commit, a->regex);
2397 			if (err)
2398 				break;
2399 
2400 			if (*a->limiting) {
2401 				if (limit_match && have_match)
2402 					*a->search_next_done =
2403 					    TOG_SEARCH_HAVE_MORE;
2404 			} else if (have_match)
2405 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2406 		}
2407 
2408 		errcode = pthread_mutex_unlock(&tog_mutex);
2409 		if (errcode && err == NULL)
2410 			err = got_error_set_errno(errcode,
2411 			    "pthread_mutex_unlock");
2412 		if (err)
2413 			break;
2414 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2415 
2416 	return err;
2417 }
2418 
2419 static void
2420 select_commit(struct tog_log_view_state *s)
2421 {
2422 	struct commit_queue_entry *entry;
2423 	int ncommits = 0;
2424 
2425 	entry = s->first_displayed_entry;
2426 	while (entry) {
2427 		if (ncommits == s->selected) {
2428 			s->selected_entry = entry;
2429 			break;
2430 		}
2431 		entry = TAILQ_NEXT(entry, entry);
2432 		ncommits++;
2433 	}
2434 }
2435 
2436 static const struct got_error *
2437 draw_commits(struct tog_view *view)
2438 {
2439 	const struct got_error *err = NULL;
2440 	struct tog_log_view_state *s = &view->state.log;
2441 	struct commit_queue_entry *entry = s->selected_entry;
2442 	int limit = view->nlines;
2443 	int width;
2444 	int ncommits, author_cols = 4;
2445 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2446 	char *refs_str = NULL;
2447 	wchar_t *wline;
2448 	struct tog_color *tc;
2449 	static const size_t date_display_cols = 12;
2450 
2451 	if (view_is_hsplit_top(view))
2452 		--limit;  /* account for border */
2453 
2454 	if (s->selected_entry &&
2455 	    !(view->searching && view->search_next_done == 0)) {
2456 		struct got_reflist_head *refs;
2457 		err = got_object_id_str(&id_str, s->selected_entry->id);
2458 		if (err)
2459 			return err;
2460 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2461 		    s->selected_entry->id);
2462 		if (refs) {
2463 			err = build_refs_str(&refs_str, refs,
2464 			    s->selected_entry->id, s->repo);
2465 			if (err)
2466 				goto done;
2467 		}
2468 	}
2469 
2470 	if (s->thread_args.commits_needed == 0)
2471 		halfdelay(10); /* disable fast refresh */
2472 
2473 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2474 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2475 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2476 		    (view->searching && !view->search_next_done) ?
2477 		    "searching..." : "loading...") == -1) {
2478 			err = got_error_from_errno("asprintf");
2479 			goto done;
2480 		}
2481 	} else {
2482 		const char *search_str = NULL;
2483 		const char *limit_str = NULL;
2484 
2485 		if (view->searching) {
2486 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2487 				search_str = "no more matches";
2488 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2489 				search_str = "no matches found";
2490 			else if (!view->search_next_done)
2491 				search_str = "searching...";
2492 		}
2493 
2494 		if (s->limit_view && s->commits->ncommits == 0)
2495 			limit_str = "no matches found";
2496 
2497 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2498 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2499 		    search_str ? search_str : (refs_str ? refs_str : ""),
2500 		    limit_str ? limit_str : "") == -1) {
2501 			err = got_error_from_errno("asprintf");
2502 			goto done;
2503 		}
2504 	}
2505 
2506 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2507 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2508 		    "........................................",
2509 		    s->in_repo_path, ncommits_str) == -1) {
2510 			err = got_error_from_errno("asprintf");
2511 			header = NULL;
2512 			goto done;
2513 		}
2514 	} else if (asprintf(&header, "commit %s%s",
2515 	    id_str ? id_str : "........................................",
2516 	    ncommits_str) == -1) {
2517 		err = got_error_from_errno("asprintf");
2518 		header = NULL;
2519 		goto done;
2520 	}
2521 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2522 	if (err)
2523 		goto done;
2524 
2525 	werase(view->window);
2526 
2527 	if (view_needs_focus_indication(view))
2528 		wstandout(view->window);
2529 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2530 	if (tc)
2531 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2532 	waddwstr(view->window, wline);
2533 	while (width < view->ncols) {
2534 		waddch(view->window, ' ');
2535 		width++;
2536 	}
2537 	if (tc)
2538 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2539 	if (view_needs_focus_indication(view))
2540 		wstandend(view->window);
2541 	free(wline);
2542 	if (limit <= 1)
2543 		goto done;
2544 
2545 	/* Grow author column size if necessary, and set view->maxx. */
2546 	entry = s->first_displayed_entry;
2547 	ncommits = 0;
2548 	view->maxx = 0;
2549 	while (entry) {
2550 		struct got_commit_object *c = entry->commit;
2551 		char *author, *eol, *msg, *msg0;
2552 		wchar_t *wauthor, *wmsg;
2553 		int width;
2554 		if (ncommits >= limit - 1)
2555 			break;
2556 		if (s->use_committer)
2557 			author = strdup(got_object_commit_get_committer(c));
2558 		else
2559 			author = strdup(got_object_commit_get_author(c));
2560 		if (author == NULL) {
2561 			err = got_error_from_errno("strdup");
2562 			goto done;
2563 		}
2564 		err = format_author(&wauthor, &width, author, COLS,
2565 		    date_display_cols);
2566 		if (author_cols < width)
2567 			author_cols = width;
2568 		free(wauthor);
2569 		free(author);
2570 		if (err)
2571 			goto done;
2572 		err = got_object_commit_get_logmsg(&msg0, c);
2573 		if (err)
2574 			goto done;
2575 		msg = msg0;
2576 		while (*msg == '\n')
2577 			++msg;
2578 		if ((eol = strchr(msg, '\n')))
2579 			*eol = '\0';
2580 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2581 		    date_display_cols + author_cols, 0);
2582 		if (err)
2583 			goto done;
2584 		view->maxx = MAX(view->maxx, width);
2585 		free(msg0);
2586 		free(wmsg);
2587 		ncommits++;
2588 		entry = TAILQ_NEXT(entry, entry);
2589 	}
2590 
2591 	entry = s->first_displayed_entry;
2592 	s->last_displayed_entry = s->first_displayed_entry;
2593 	ncommits = 0;
2594 	while (entry) {
2595 		if (ncommits >= limit - 1)
2596 			break;
2597 		if (ncommits == s->selected)
2598 			wstandout(view->window);
2599 		err = draw_commit(view, entry->commit, entry->id,
2600 		    date_display_cols, author_cols);
2601 		if (ncommits == s->selected)
2602 			wstandend(view->window);
2603 		if (err)
2604 			goto done;
2605 		ncommits++;
2606 		s->last_displayed_entry = entry;
2607 		entry = TAILQ_NEXT(entry, entry);
2608 	}
2609 
2610 	view_border(view);
2611 done:
2612 	free(id_str);
2613 	free(refs_str);
2614 	free(ncommits_str);
2615 	free(header);
2616 	return err;
2617 }
2618 
2619 static void
2620 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2621 {
2622 	struct commit_queue_entry *entry;
2623 	int nscrolled = 0;
2624 
2625 	entry = TAILQ_FIRST(&s->commits->head);
2626 	if (s->first_displayed_entry == entry)
2627 		return;
2628 
2629 	entry = s->first_displayed_entry;
2630 	while (entry && nscrolled < maxscroll) {
2631 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2632 		if (entry) {
2633 			s->first_displayed_entry = entry;
2634 			nscrolled++;
2635 		}
2636 	}
2637 }
2638 
2639 static const struct got_error *
2640 trigger_log_thread(struct tog_view *view, int wait)
2641 {
2642 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2643 	int errcode;
2644 
2645 	halfdelay(1); /* fast refresh while loading commits */
2646 
2647 	while (!ta->log_complete && !tog_thread_error &&
2648 	    (ta->commits_needed > 0 || ta->load_all)) {
2649 		/* Wake the log thread. */
2650 		errcode = pthread_cond_signal(&ta->need_commits);
2651 		if (errcode)
2652 			return got_error_set_errno(errcode,
2653 			    "pthread_cond_signal");
2654 
2655 		/*
2656 		 * The mutex will be released while the view loop waits
2657 		 * in wgetch(), at which time the log thread will run.
2658 		 */
2659 		if (!wait)
2660 			break;
2661 
2662 		/* Display progress update in log view. */
2663 		show_log_view(view);
2664 		update_panels();
2665 		doupdate();
2666 
2667 		/* Wait right here while next commit is being loaded. */
2668 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2669 		if (errcode)
2670 			return got_error_set_errno(errcode,
2671 			    "pthread_cond_wait");
2672 
2673 		/* Display progress update in log view. */
2674 		show_log_view(view);
2675 		update_panels();
2676 		doupdate();
2677 	}
2678 
2679 	return NULL;
2680 }
2681 
2682 static const struct got_error *
2683 request_log_commits(struct tog_view *view)
2684 {
2685 	struct tog_log_view_state	*state = &view->state.log;
2686 	const struct got_error		*err = NULL;
2687 
2688 	if (state->thread_args.log_complete)
2689 		return NULL;
2690 
2691 	state->thread_args.commits_needed += view->nscrolled;
2692 	err = trigger_log_thread(view, 1);
2693 	view->nscrolled = 0;
2694 
2695 	return err;
2696 }
2697 
2698 static const struct got_error *
2699 log_scroll_down(struct tog_view *view, int maxscroll)
2700 {
2701 	struct tog_log_view_state *s = &view->state.log;
2702 	const struct got_error *err = NULL;
2703 	struct commit_queue_entry *pentry;
2704 	int nscrolled = 0, ncommits_needed;
2705 
2706 	if (s->last_displayed_entry == NULL)
2707 		return NULL;
2708 
2709 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2710 	if (s->commits->ncommits < ncommits_needed &&
2711 	    !s->thread_args.log_complete) {
2712 		/*
2713 		 * Ask the log thread for required amount of commits.
2714 		 */
2715 		s->thread_args.commits_needed +=
2716 		    ncommits_needed - s->commits->ncommits;
2717 		err = trigger_log_thread(view, 1);
2718 		if (err)
2719 			return err;
2720 	}
2721 
2722 	do {
2723 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2724 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2725 			break;
2726 
2727 		s->last_displayed_entry = pentry ?
2728 		    pentry : s->last_displayed_entry;
2729 
2730 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2731 		if (pentry == NULL)
2732 			break;
2733 		s->first_displayed_entry = pentry;
2734 	} while (++nscrolled < maxscroll);
2735 
2736 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2737 		view->nscrolled += nscrolled;
2738 	else
2739 		view->nscrolled = 0;
2740 
2741 	return err;
2742 }
2743 
2744 static const struct got_error *
2745 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2746     struct got_commit_object *commit, struct got_object_id *commit_id,
2747     struct tog_view *log_view, struct got_repository *repo)
2748 {
2749 	const struct got_error *err;
2750 	struct got_object_qid *parent_id;
2751 	struct tog_view *diff_view;
2752 
2753 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2754 	if (diff_view == NULL)
2755 		return got_error_from_errno("view_open");
2756 
2757 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2758 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2759 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2760 	if (err == NULL)
2761 		*new_view = diff_view;
2762 	return err;
2763 }
2764 
2765 static const struct got_error *
2766 tree_view_visit_subtree(struct tog_tree_view_state *s,
2767     struct got_tree_object *subtree)
2768 {
2769 	struct tog_parent_tree *parent;
2770 
2771 	parent = calloc(1, sizeof(*parent));
2772 	if (parent == NULL)
2773 		return got_error_from_errno("calloc");
2774 
2775 	parent->tree = s->tree;
2776 	parent->first_displayed_entry = s->first_displayed_entry;
2777 	parent->selected_entry = s->selected_entry;
2778 	parent->selected = s->selected;
2779 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2780 	s->tree = subtree;
2781 	s->selected = 0;
2782 	s->first_displayed_entry = NULL;
2783 	return NULL;
2784 }
2785 
2786 static const struct got_error *
2787 tree_view_walk_path(struct tog_tree_view_state *s,
2788     struct got_commit_object *commit, const char *path)
2789 {
2790 	const struct got_error *err = NULL;
2791 	struct got_tree_object *tree = NULL;
2792 	const char *p;
2793 	char *slash, *subpath = NULL;
2794 
2795 	/* Walk the path and open corresponding tree objects. */
2796 	p = path;
2797 	while (*p) {
2798 		struct got_tree_entry *te;
2799 		struct got_object_id *tree_id;
2800 		char *te_name;
2801 
2802 		while (p[0] == '/')
2803 			p++;
2804 
2805 		/* Ensure the correct subtree entry is selected. */
2806 		slash = strchr(p, '/');
2807 		if (slash == NULL)
2808 			te_name = strdup(p);
2809 		else
2810 			te_name = strndup(p, slash - p);
2811 		if (te_name == NULL) {
2812 			err = got_error_from_errno("strndup");
2813 			break;
2814 		}
2815 		te = got_object_tree_find_entry(s->tree, te_name);
2816 		if (te == NULL) {
2817 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2818 			free(te_name);
2819 			break;
2820 		}
2821 		free(te_name);
2822 		s->first_displayed_entry = s->selected_entry = te;
2823 
2824 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2825 			break; /* jump to this file's entry */
2826 
2827 		slash = strchr(p, '/');
2828 		if (slash)
2829 			subpath = strndup(path, slash - path);
2830 		else
2831 			subpath = strdup(path);
2832 		if (subpath == NULL) {
2833 			err = got_error_from_errno("strdup");
2834 			break;
2835 		}
2836 
2837 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2838 		    subpath);
2839 		if (err)
2840 			break;
2841 
2842 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2843 		free(tree_id);
2844 		if (err)
2845 			break;
2846 
2847 		err = tree_view_visit_subtree(s, tree);
2848 		if (err) {
2849 			got_object_tree_close(tree);
2850 			break;
2851 		}
2852 		if (slash == NULL)
2853 			break;
2854 		free(subpath);
2855 		subpath = NULL;
2856 		p = slash;
2857 	}
2858 
2859 	free(subpath);
2860 	return err;
2861 }
2862 
2863 static const struct got_error *
2864 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2865     struct commit_queue_entry *entry, const char *path,
2866     const char *head_ref_name, struct got_repository *repo)
2867 {
2868 	const struct got_error *err = NULL;
2869 	struct tog_tree_view_state *s;
2870 	struct tog_view *tree_view;
2871 
2872 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2873 	if (tree_view == NULL)
2874 		return got_error_from_errno("view_open");
2875 
2876 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2877 	if (err)
2878 		return err;
2879 	s = &tree_view->state.tree;
2880 
2881 	*new_view = tree_view;
2882 
2883 	if (got_path_is_root_dir(path))
2884 		return NULL;
2885 
2886 	return tree_view_walk_path(s, entry->commit, path);
2887 }
2888 
2889 static const struct got_error *
2890 block_signals_used_by_main_thread(void)
2891 {
2892 	sigset_t sigset;
2893 	int errcode;
2894 
2895 	if (sigemptyset(&sigset) == -1)
2896 		return got_error_from_errno("sigemptyset");
2897 
2898 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2899 	if (sigaddset(&sigset, SIGWINCH) == -1)
2900 		return got_error_from_errno("sigaddset");
2901 	if (sigaddset(&sigset, SIGCONT) == -1)
2902 		return got_error_from_errno("sigaddset");
2903 	if (sigaddset(&sigset, SIGINT) == -1)
2904 		return got_error_from_errno("sigaddset");
2905 	if (sigaddset(&sigset, SIGTERM) == -1)
2906 		return got_error_from_errno("sigaddset");
2907 
2908 	/* ncurses handles SIGTSTP */
2909 	if (sigaddset(&sigset, SIGTSTP) == -1)
2910 		return got_error_from_errno("sigaddset");
2911 
2912 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2913 	if (errcode)
2914 		return got_error_set_errno(errcode, "pthread_sigmask");
2915 
2916 	return NULL;
2917 }
2918 
2919 static void *
2920 log_thread(void *arg)
2921 {
2922 	const struct got_error *err = NULL;
2923 	int errcode = 0;
2924 	struct tog_log_thread_args *a = arg;
2925 	int done = 0;
2926 
2927 	/*
2928 	 * Sync startup with main thread such that we begin our
2929 	 * work once view_input() has released the mutex.
2930 	 */
2931 	errcode = pthread_mutex_lock(&tog_mutex);
2932 	if (errcode) {
2933 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2934 		return (void *)err;
2935 	}
2936 
2937 	err = block_signals_used_by_main_thread();
2938 	if (err) {
2939 		pthread_mutex_unlock(&tog_mutex);
2940 		goto done;
2941 	}
2942 
2943 	while (!done && !err && !tog_fatal_signal_received()) {
2944 		errcode = pthread_mutex_unlock(&tog_mutex);
2945 		if (errcode) {
2946 			err = got_error_set_errno(errcode,
2947 			    "pthread_mutex_unlock");
2948 			goto done;
2949 		}
2950 		err = queue_commits(a);
2951 		if (err) {
2952 			if (err->code != GOT_ERR_ITER_COMPLETED)
2953 				goto done;
2954 			err = NULL;
2955 			done = 1;
2956 		} else if (a->commits_needed > 0 && !a->load_all) {
2957 			if (*a->limiting) {
2958 				if (a->limit_match)
2959 					a->commits_needed--;
2960 			} else
2961 				a->commits_needed--;
2962 		}
2963 
2964 		errcode = pthread_mutex_lock(&tog_mutex);
2965 		if (errcode) {
2966 			err = got_error_set_errno(errcode,
2967 			    "pthread_mutex_lock");
2968 			goto done;
2969 		} else if (*a->quit)
2970 			done = 1;
2971 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2972 			*a->first_displayed_entry =
2973 			    TAILQ_FIRST(&a->limit_commits->head);
2974 			*a->selected_entry = *a->first_displayed_entry;
2975 		} else if (*a->first_displayed_entry == NULL) {
2976 			*a->first_displayed_entry =
2977 			    TAILQ_FIRST(&a->real_commits->head);
2978 			*a->selected_entry = *a->first_displayed_entry;
2979 		}
2980 
2981 		errcode = pthread_cond_signal(&a->commit_loaded);
2982 		if (errcode) {
2983 			err = got_error_set_errno(errcode,
2984 			    "pthread_cond_signal");
2985 			pthread_mutex_unlock(&tog_mutex);
2986 			goto done;
2987 		}
2988 
2989 		if (done)
2990 			a->commits_needed = 0;
2991 		else {
2992 			if (a->commits_needed == 0 && !a->load_all) {
2993 				errcode = pthread_cond_wait(&a->need_commits,
2994 				    &tog_mutex);
2995 				if (errcode) {
2996 					err = got_error_set_errno(errcode,
2997 					    "pthread_cond_wait");
2998 					pthread_mutex_unlock(&tog_mutex);
2999 					goto done;
3000 				}
3001 				if (*a->quit)
3002 					done = 1;
3003 			}
3004 		}
3005 	}
3006 	a->log_complete = 1;
3007 	errcode = pthread_mutex_unlock(&tog_mutex);
3008 	if (errcode)
3009 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3010 done:
3011 	if (err) {
3012 		tog_thread_error = 1;
3013 		pthread_cond_signal(&a->commit_loaded);
3014 	}
3015 	return (void *)err;
3016 }
3017 
3018 static const struct got_error *
3019 stop_log_thread(struct tog_log_view_state *s)
3020 {
3021 	const struct got_error *err = NULL, *thread_err = NULL;
3022 	int errcode;
3023 
3024 	if (s->thread) {
3025 		s->quit = 1;
3026 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3027 		if (errcode)
3028 			return got_error_set_errno(errcode,
3029 			    "pthread_cond_signal");
3030 		errcode = pthread_mutex_unlock(&tog_mutex);
3031 		if (errcode)
3032 			return got_error_set_errno(errcode,
3033 			    "pthread_mutex_unlock");
3034 		errcode = pthread_join(s->thread, (void **)&thread_err);
3035 		if (errcode)
3036 			return got_error_set_errno(errcode, "pthread_join");
3037 		errcode = pthread_mutex_lock(&tog_mutex);
3038 		if (errcode)
3039 			return got_error_set_errno(errcode,
3040 			    "pthread_mutex_lock");
3041 		s->thread = 0; //NULL;
3042 	}
3043 
3044 	if (s->thread_args.repo) {
3045 		err = got_repo_close(s->thread_args.repo);
3046 		s->thread_args.repo = NULL;
3047 	}
3048 
3049 	if (s->thread_args.pack_fds) {
3050 		const struct got_error *pack_err =
3051 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3052 		if (err == NULL)
3053 			err = pack_err;
3054 		s->thread_args.pack_fds = NULL;
3055 	}
3056 
3057 	if (s->thread_args.graph) {
3058 		got_commit_graph_close(s->thread_args.graph);
3059 		s->thread_args.graph = NULL;
3060 	}
3061 
3062 	return err ? err : thread_err;
3063 }
3064 
3065 static const struct got_error *
3066 close_log_view(struct tog_view *view)
3067 {
3068 	const struct got_error *err = NULL;
3069 	struct tog_log_view_state *s = &view->state.log;
3070 	int errcode;
3071 
3072 	err = stop_log_thread(s);
3073 
3074 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3075 	if (errcode && err == NULL)
3076 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3077 
3078 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3079 	if (errcode && err == NULL)
3080 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3081 
3082 	free_commits(&s->limit_commits);
3083 	free_commits(&s->real_commits);
3084 	free(s->in_repo_path);
3085 	s->in_repo_path = NULL;
3086 	free(s->start_id);
3087 	s->start_id = NULL;
3088 	free(s->head_ref_name);
3089 	s->head_ref_name = NULL;
3090 	return err;
3091 }
3092 
3093 /*
3094  * We use two queues to implement the limit feature: first consists of
3095  * commits matching the current limit_regex; second is the real queue
3096  * of all known commits (real_commits). When the user starts limiting,
3097  * we swap queues such that all movement and displaying functionality
3098  * works with very slight change.
3099  */
3100 static const struct got_error *
3101 limit_log_view(struct tog_view *view)
3102 {
3103 	struct tog_log_view_state *s = &view->state.log;
3104 	struct commit_queue_entry *entry;
3105 	struct tog_view	*v = view;
3106 	const struct got_error *err = NULL;
3107 	char pattern[1024];
3108 	int ret;
3109 
3110 	if (view_is_hsplit_top(view))
3111 		v = view->child;
3112 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3113 		v = view->parent;
3114 
3115 	/* Get the pattern */
3116 	wmove(v->window, v->nlines - 1, 0);
3117 	wclrtoeol(v->window);
3118 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3119 	nodelay(v->window, FALSE);
3120 	nocbreak();
3121 	echo();
3122 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3123 	cbreak();
3124 	noecho();
3125 	nodelay(v->window, TRUE);
3126 	if (ret == ERR)
3127 		return NULL;
3128 
3129 	if (*pattern == '\0') {
3130 		/*
3131 		 * Safety measure for the situation where the user
3132 		 * resets limit without previously limiting anything.
3133 		 */
3134 		if (!s->limit_view)
3135 			return NULL;
3136 
3137 		/*
3138 		 * User could have pressed Ctrl+L, which refreshed the
3139 		 * commit queues, it means we can't save previously
3140 		 * (before limit took place) displayed entries,
3141 		 * because they would point to already free'ed memory,
3142 		 * so we are forced to always select first entry of
3143 		 * the queue.
3144 		 */
3145 		s->commits = &s->real_commits;
3146 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3147 		s->selected_entry = s->first_displayed_entry;
3148 		s->selected = 0;
3149 		s->limit_view = 0;
3150 
3151 		return NULL;
3152 	}
3153 
3154 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3155 		return NULL;
3156 
3157 	s->limit_view = 1;
3158 
3159 	/* Clear the screen while loading limit view */
3160 	s->first_displayed_entry = NULL;
3161 	s->last_displayed_entry = NULL;
3162 	s->selected_entry = NULL;
3163 	s->commits = &s->limit_commits;
3164 
3165 	/* Prepare limit queue for new search */
3166 	free_commits(&s->limit_commits);
3167 	s->limit_commits.ncommits = 0;
3168 
3169 	/* First process commits, which are in queue already */
3170 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3171 		int have_match = 0;
3172 
3173 		err = match_commit(&have_match, entry->id,
3174 		    entry->commit, &s->limit_regex);
3175 		if (err)
3176 			return err;
3177 
3178 		if (have_match) {
3179 			struct commit_queue_entry *matched;
3180 
3181 			matched = alloc_commit_queue_entry(entry->commit,
3182 			    entry->id);
3183 			if (matched == NULL) {
3184 				err = got_error_from_errno(
3185 				    "alloc_commit_queue_entry");
3186 				break;
3187 			}
3188 			matched->commit = entry->commit;
3189 			got_object_commit_retain(entry->commit);
3190 
3191 			matched->idx = s->limit_commits.ncommits;
3192 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3193 			    matched, entry);
3194 			s->limit_commits.ncommits++;
3195 		}
3196 	}
3197 
3198 	/* Second process all the commits, until we fill the screen */
3199 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3200 	    !s->thread_args.log_complete) {
3201 		s->thread_args.commits_needed +=
3202 		    view->nlines - s->limit_commits.ncommits - 1;
3203 		err = trigger_log_thread(view, 1);
3204 		if (err)
3205 			return err;
3206 	}
3207 
3208 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3209 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3210 	s->selected = 0;
3211 
3212 	return NULL;
3213 }
3214 
3215 static const struct got_error *
3216 search_start_log_view(struct tog_view *view)
3217 {
3218 	struct tog_log_view_state *s = &view->state.log;
3219 
3220 	s->matched_entry = NULL;
3221 	s->search_entry = NULL;
3222 	return NULL;
3223 }
3224 
3225 static const struct got_error *
3226 search_next_log_view(struct tog_view *view)
3227 {
3228 	const struct got_error *err = NULL;
3229 	struct tog_log_view_state *s = &view->state.log;
3230 	struct commit_queue_entry *entry;
3231 
3232 	/* Display progress update in log view. */
3233 	show_log_view(view);
3234 	update_panels();
3235 	doupdate();
3236 
3237 	if (s->search_entry) {
3238 		int errcode, ch;
3239 		errcode = pthread_mutex_unlock(&tog_mutex);
3240 		if (errcode)
3241 			return got_error_set_errno(errcode,
3242 			    "pthread_mutex_unlock");
3243 		ch = wgetch(view->window);
3244 		errcode = pthread_mutex_lock(&tog_mutex);
3245 		if (errcode)
3246 			return got_error_set_errno(errcode,
3247 			    "pthread_mutex_lock");
3248 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3249 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3250 			return NULL;
3251 		}
3252 		if (view->searching == TOG_SEARCH_FORWARD)
3253 			entry = TAILQ_NEXT(s->search_entry, entry);
3254 		else
3255 			entry = TAILQ_PREV(s->search_entry,
3256 			    commit_queue_head, entry);
3257 	} else if (s->matched_entry) {
3258 		/*
3259 		 * If the user has moved the cursor after we hit a match,
3260 		 * the position from where we should continue searching
3261 		 * might have changed.
3262 		 */
3263 		if (view->searching == TOG_SEARCH_FORWARD)
3264 			entry = TAILQ_NEXT(s->selected_entry, entry);
3265 		else
3266 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3267 			    entry);
3268 	} else {
3269 		entry = s->selected_entry;
3270 	}
3271 
3272 	while (1) {
3273 		int have_match = 0;
3274 
3275 		if (entry == NULL) {
3276 			if (s->thread_args.log_complete ||
3277 			    view->searching == TOG_SEARCH_BACKWARD) {
3278 				view->search_next_done =
3279 				    (s->matched_entry == NULL ?
3280 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3281 				s->search_entry = NULL;
3282 				return NULL;
3283 			}
3284 			/*
3285 			 * Poke the log thread for more commits and return,
3286 			 * allowing the main loop to make progress. Search
3287 			 * will resume at s->search_entry once we come back.
3288 			 */
3289 			s->thread_args.commits_needed++;
3290 			return trigger_log_thread(view, 0);
3291 		}
3292 
3293 		err = match_commit(&have_match, entry->id, entry->commit,
3294 		    &view->regex);
3295 		if (err)
3296 			break;
3297 		if (have_match) {
3298 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3299 			s->matched_entry = entry;
3300 			break;
3301 		}
3302 
3303 		s->search_entry = entry;
3304 		if (view->searching == TOG_SEARCH_FORWARD)
3305 			entry = TAILQ_NEXT(entry, entry);
3306 		else
3307 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3308 	}
3309 
3310 	if (s->matched_entry) {
3311 		int cur = s->selected_entry->idx;
3312 		while (cur < s->matched_entry->idx) {
3313 			err = input_log_view(NULL, view, KEY_DOWN);
3314 			if (err)
3315 				return err;
3316 			cur++;
3317 		}
3318 		while (cur > s->matched_entry->idx) {
3319 			err = input_log_view(NULL, view, KEY_UP);
3320 			if (err)
3321 				return err;
3322 			cur--;
3323 		}
3324 	}
3325 
3326 	s->search_entry = NULL;
3327 
3328 	return NULL;
3329 }
3330 
3331 static const struct got_error *
3332 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3333     struct got_repository *repo, const char *head_ref_name,
3334     const char *in_repo_path, int log_branches)
3335 {
3336 	const struct got_error *err = NULL;
3337 	struct tog_log_view_state *s = &view->state.log;
3338 	struct got_repository *thread_repo = NULL;
3339 	struct got_commit_graph *thread_graph = NULL;
3340 	int errcode;
3341 
3342 	if (in_repo_path != s->in_repo_path) {
3343 		free(s->in_repo_path);
3344 		s->in_repo_path = strdup(in_repo_path);
3345 		if (s->in_repo_path == NULL)
3346 			return got_error_from_errno("strdup");
3347 	}
3348 
3349 	/* The commit queue only contains commits being displayed. */
3350 	TAILQ_INIT(&s->real_commits.head);
3351 	s->real_commits.ncommits = 0;
3352 	s->commits = &s->real_commits;
3353 
3354 	TAILQ_INIT(&s->limit_commits.head);
3355 	s->limit_view = 0;
3356 	s->limit_commits.ncommits = 0;
3357 
3358 	s->repo = repo;
3359 	if (head_ref_name) {
3360 		s->head_ref_name = strdup(head_ref_name);
3361 		if (s->head_ref_name == NULL) {
3362 			err = got_error_from_errno("strdup");
3363 			goto done;
3364 		}
3365 	}
3366 	s->start_id = got_object_id_dup(start_id);
3367 	if (s->start_id == NULL) {
3368 		err = got_error_from_errno("got_object_id_dup");
3369 		goto done;
3370 	}
3371 	s->log_branches = log_branches;
3372 	s->use_committer = 1;
3373 
3374 	STAILQ_INIT(&s->colors);
3375 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3376 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3377 		    get_color_value("TOG_COLOR_COMMIT"));
3378 		if (err)
3379 			goto done;
3380 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3381 		    get_color_value("TOG_COLOR_AUTHOR"));
3382 		if (err) {
3383 			free_colors(&s->colors);
3384 			goto done;
3385 		}
3386 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3387 		    get_color_value("TOG_COLOR_DATE"));
3388 		if (err) {
3389 			free_colors(&s->colors);
3390 			goto done;
3391 		}
3392 	}
3393 
3394 	view->show = show_log_view;
3395 	view->input = input_log_view;
3396 	view->resize = resize_log_view;
3397 	view->close = close_log_view;
3398 	view->search_start = search_start_log_view;
3399 	view->search_next = search_next_log_view;
3400 
3401 	if (s->thread_args.pack_fds == NULL) {
3402 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3403 		if (err)
3404 			goto done;
3405 	}
3406 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3407 	    s->thread_args.pack_fds);
3408 	if (err)
3409 		goto done;
3410 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3411 	    !s->log_branches);
3412 	if (err)
3413 		goto done;
3414 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3415 	    s->repo, NULL, NULL);
3416 	if (err)
3417 		goto done;
3418 
3419 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3420 	if (errcode) {
3421 		err = got_error_set_errno(errcode, "pthread_cond_init");
3422 		goto done;
3423 	}
3424 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3425 	if (errcode) {
3426 		err = got_error_set_errno(errcode, "pthread_cond_init");
3427 		goto done;
3428 	}
3429 
3430 	s->thread_args.commits_needed = view->nlines;
3431 	s->thread_args.graph = thread_graph;
3432 	s->thread_args.real_commits = &s->real_commits;
3433 	s->thread_args.limit_commits = &s->limit_commits;
3434 	s->thread_args.in_repo_path = s->in_repo_path;
3435 	s->thread_args.start_id = s->start_id;
3436 	s->thread_args.repo = thread_repo;
3437 	s->thread_args.log_complete = 0;
3438 	s->thread_args.quit = &s->quit;
3439 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3440 	s->thread_args.selected_entry = &s->selected_entry;
3441 	s->thread_args.searching = &view->searching;
3442 	s->thread_args.search_next_done = &view->search_next_done;
3443 	s->thread_args.regex = &view->regex;
3444 	s->thread_args.limiting = &s->limit_view;
3445 	s->thread_args.limit_regex = &s->limit_regex;
3446 	s->thread_args.limit_commits = &s->limit_commits;
3447 done:
3448 	if (err)
3449 		close_log_view(view);
3450 	return err;
3451 }
3452 
3453 static const struct got_error *
3454 show_log_view(struct tog_view *view)
3455 {
3456 	const struct got_error *err;
3457 	struct tog_log_view_state *s = &view->state.log;
3458 
3459 	if (s->thread == 0) { //NULL) {
3460 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3461 		    &s->thread_args);
3462 		if (errcode)
3463 			return got_error_set_errno(errcode, "pthread_create");
3464 		if (s->thread_args.commits_needed > 0) {
3465 			err = trigger_log_thread(view, 1);
3466 			if (err)
3467 				return err;
3468 		}
3469 	}
3470 
3471 	return draw_commits(view);
3472 }
3473 
3474 static void
3475 log_move_cursor_up(struct tog_view *view, int page, int home)
3476 {
3477 	struct tog_log_view_state *s = &view->state.log;
3478 
3479 	if (s->first_displayed_entry == NULL)
3480 		return;
3481 	if (s->selected_entry->idx == 0)
3482 		view->count = 0;
3483 
3484 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3485 	    || home)
3486 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3487 
3488 	if (!page && !home && s->selected > 0)
3489 		--s->selected;
3490 	else
3491 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3492 
3493 	select_commit(s);
3494 	return;
3495 }
3496 
3497 static const struct got_error *
3498 log_move_cursor_down(struct tog_view *view, int page)
3499 {
3500 	struct tog_log_view_state	*s = &view->state.log;
3501 	const struct got_error		*err = NULL;
3502 	int				 eos = view->nlines - 2;
3503 
3504 	if (s->first_displayed_entry == NULL)
3505 		return NULL;
3506 
3507 	if (s->thread_args.log_complete &&
3508 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3509 		return NULL;
3510 
3511 	if (view_is_hsplit_top(view))
3512 		--eos;  /* border consumes the last line */
3513 
3514 	if (!page) {
3515 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3516 			++s->selected;
3517 		else
3518 			err = log_scroll_down(view, 1);
3519 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3520 		struct commit_queue_entry *entry;
3521 		int n;
3522 
3523 		s->selected = 0;
3524 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3525 		s->last_displayed_entry = entry;
3526 		for (n = 0; n <= eos; n++) {
3527 			if (entry == NULL)
3528 				break;
3529 			s->first_displayed_entry = entry;
3530 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3531 		}
3532 		if (n > 0)
3533 			s->selected = n - 1;
3534 	} else {
3535 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3536 		    s->thread_args.log_complete)
3537 			s->selected += MIN(page,
3538 			    s->commits->ncommits - s->selected_entry->idx - 1);
3539 		else
3540 			err = log_scroll_down(view, page);
3541 	}
3542 	if (err)
3543 		return err;
3544 
3545 	/*
3546 	 * We might necessarily overshoot in horizontal
3547 	 * splits; if so, select the last displayed commit.
3548 	 */
3549 	if (s->first_displayed_entry && s->last_displayed_entry) {
3550 		s->selected = MIN(s->selected,
3551 		    s->last_displayed_entry->idx -
3552 		    s->first_displayed_entry->idx);
3553 	}
3554 
3555 	select_commit(s);
3556 
3557 	if (s->thread_args.log_complete &&
3558 	    s->selected_entry->idx == s->commits->ncommits - 1)
3559 		view->count = 0;
3560 
3561 	return NULL;
3562 }
3563 
3564 static void
3565 view_get_split(struct tog_view *view, int *y, int *x)
3566 {
3567 	*x = 0;
3568 	*y = 0;
3569 
3570 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3571 		if (view->child && view->child->resized_y)
3572 			*y = view->child->resized_y;
3573 		else if (view->resized_y)
3574 			*y = view->resized_y;
3575 		else
3576 			*y = view_split_begin_y(view->lines);
3577 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3578 		if (view->child && view->child->resized_x)
3579 			*x = view->child->resized_x;
3580 		else if (view->resized_x)
3581 			*x = view->resized_x;
3582 		else
3583 			*x = view_split_begin_x(view->begin_x);
3584 	}
3585 }
3586 
3587 /* Split view horizontally at y and offset view->state->selected line. */
3588 static const struct got_error *
3589 view_init_hsplit(struct tog_view *view, int y)
3590 {
3591 	const struct got_error *err = NULL;
3592 
3593 	view->nlines = y;
3594 	view->ncols = COLS;
3595 	err = view_resize(view);
3596 	if (err)
3597 		return err;
3598 
3599 	err = offset_selection_down(view);
3600 
3601 	return err;
3602 }
3603 
3604 static const struct got_error *
3605 log_goto_line(struct tog_view *view, int nlines)
3606 {
3607 	const struct got_error		*err = NULL;
3608 	struct tog_log_view_state	*s = &view->state.log;
3609 	int				 g, idx = s->selected_entry->idx;
3610 
3611 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3612 		return NULL;
3613 
3614 	g = view->gline;
3615 	view->gline = 0;
3616 
3617 	if (g >= s->first_displayed_entry->idx + 1 &&
3618 	    g <= s->last_displayed_entry->idx + 1 &&
3619 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3620 		s->selected = g - s->first_displayed_entry->idx - 1;
3621 		select_commit(s);
3622 		return NULL;
3623 	}
3624 
3625 	if (idx + 1 < g) {
3626 		err = log_move_cursor_down(view, g - idx - 1);
3627 		if (!err && g > s->selected_entry->idx + 1)
3628 			err = log_move_cursor_down(view,
3629 			    g - s->first_displayed_entry->idx - 1);
3630 		if (err)
3631 			return err;
3632 	} else if (idx + 1 > g)
3633 		log_move_cursor_up(view, idx - g + 1, 0);
3634 
3635 	if (g < nlines && s->first_displayed_entry->idx == 0)
3636 		s->selected = g - 1;
3637 
3638 	select_commit(s);
3639 	return NULL;
3640 
3641 }
3642 
3643 static const struct got_error *
3644 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3645 {
3646 	const struct got_error *err = NULL;
3647 	struct tog_log_view_state *s = &view->state.log;
3648 	int eos, nscroll;
3649 
3650 	if (s->thread_args.load_all) {
3651 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3652 			s->thread_args.load_all = 0;
3653 		else if (s->thread_args.log_complete) {
3654 			err = log_move_cursor_down(view, s->commits->ncommits);
3655 			s->thread_args.load_all = 0;
3656 		}
3657 		if (err)
3658 			return err;
3659 	}
3660 
3661 	eos = nscroll = view->nlines - 1;
3662 	if (view_is_hsplit_top(view))
3663 		--eos;  /* border */
3664 
3665 	if (view->gline)
3666 		return log_goto_line(view, eos);
3667 
3668 	switch (ch) {
3669 	case '&':
3670 		err = limit_log_view(view);
3671 		break;
3672 	case 'q':
3673 		s->quit = 1;
3674 		break;
3675 	case '0':
3676 		view->x = 0;
3677 		break;
3678 	case '$':
3679 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3680 		view->count = 0;
3681 		break;
3682 	case KEY_RIGHT:
3683 	case 'l':
3684 		if (view->x + view->ncols / 2 < view->maxx)
3685 			view->x += 2;  /* move two columns right */
3686 		else
3687 			view->count = 0;
3688 		break;
3689 	case KEY_LEFT:
3690 	case 'h':
3691 		view->x -= MIN(view->x, 2);  /* move two columns back */
3692 		if (view->x <= 0)
3693 			view->count = 0;
3694 		break;
3695 	case 'k':
3696 	case KEY_UP:
3697 	case '<':
3698 	case ',':
3699 	case CTRL('p'):
3700 		log_move_cursor_up(view, 0, 0);
3701 		break;
3702 	case 'g':
3703 	case '=':
3704 	case KEY_HOME:
3705 		log_move_cursor_up(view, 0, 1);
3706 		view->count = 0;
3707 		break;
3708 	case CTRL('u'):
3709 	case 'u':
3710 		nscroll /= 2;
3711 		/* FALL THROUGH */
3712 	case KEY_PPAGE:
3713 	case CTRL('b'):
3714 	case 'b':
3715 		log_move_cursor_up(view, nscroll, 0);
3716 		break;
3717 	case 'j':
3718 	case KEY_DOWN:
3719 	case '>':
3720 	case '.':
3721 	case CTRL('n'):
3722 		err = log_move_cursor_down(view, 0);
3723 		break;
3724 	case '@':
3725 		s->use_committer = !s->use_committer;
3726 		break;
3727 	case 'G':
3728 	case '*':
3729 	case KEY_END: {
3730 		/* We don't know yet how many commits, so we're forced to
3731 		 * traverse them all. */
3732 		view->count = 0;
3733 		s->thread_args.load_all = 1;
3734 		if (!s->thread_args.log_complete)
3735 			return trigger_log_thread(view, 0);
3736 		err = log_move_cursor_down(view, s->commits->ncommits);
3737 		s->thread_args.load_all = 0;
3738 		break;
3739 	}
3740 	case CTRL('d'):
3741 	case 'd':
3742 		nscroll /= 2;
3743 		/* FALL THROUGH */
3744 	case KEY_NPAGE:
3745 	case CTRL('f'):
3746 	case 'f':
3747 	case ' ':
3748 		err = log_move_cursor_down(view, nscroll);
3749 		break;
3750 	case KEY_RESIZE:
3751 		if (s->selected > view->nlines - 2)
3752 			s->selected = view->nlines - 2;
3753 		if (s->selected > s->commits->ncommits - 1)
3754 			s->selected = s->commits->ncommits - 1;
3755 		select_commit(s);
3756 		if (s->commits->ncommits < view->nlines - 1 &&
3757 		    !s->thread_args.log_complete) {
3758 			s->thread_args.commits_needed += (view->nlines - 1) -
3759 			    s->commits->ncommits;
3760 			err = trigger_log_thread(view, 1);
3761 		}
3762 		break;
3763 	case KEY_ENTER:
3764 	case '\r':
3765 		view->count = 0;
3766 		if (s->selected_entry == NULL)
3767 			break;
3768 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3769 		break;
3770 	case 'T':
3771 		view->count = 0;
3772 		if (s->selected_entry == NULL)
3773 			break;
3774 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3775 		break;
3776 	case KEY_BACKSPACE:
3777 	case CTRL('l'):
3778 	case 'B':
3779 		view->count = 0;
3780 		if (ch == KEY_BACKSPACE &&
3781 		    got_path_is_root_dir(s->in_repo_path))
3782 			break;
3783 		err = stop_log_thread(s);
3784 		if (err)
3785 			return err;
3786 		if (ch == KEY_BACKSPACE) {
3787 			char *parent_path;
3788 			err = got_path_dirname(&parent_path, s->in_repo_path);
3789 			if (err)
3790 				return err;
3791 			free(s->in_repo_path);
3792 			s->in_repo_path = parent_path;
3793 			s->thread_args.in_repo_path = s->in_repo_path;
3794 		} else if (ch == CTRL('l')) {
3795 			struct got_object_id *start_id;
3796 			err = got_repo_match_object_id(&start_id, NULL,
3797 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3798 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3799 			if (err) {
3800 				if (s->head_ref_name == NULL ||
3801 				    err->code != GOT_ERR_NOT_REF)
3802 					return err;
3803 				/* Try to cope with deleted references. */
3804 				free(s->head_ref_name);
3805 				s->head_ref_name = NULL;
3806 				err = got_repo_match_object_id(&start_id,
3807 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3808 				    &tog_refs, s->repo);
3809 				if (err)
3810 					return err;
3811 			}
3812 			free(s->start_id);
3813 			s->start_id = start_id;
3814 			s->thread_args.start_id = s->start_id;
3815 		} else /* 'B' */
3816 			s->log_branches = !s->log_branches;
3817 
3818 		if (s->thread_args.pack_fds == NULL) {
3819 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3820 			if (err)
3821 				return err;
3822 		}
3823 		err = got_repo_open(&s->thread_args.repo,
3824 		    got_repo_get_path(s->repo), NULL,
3825 		    s->thread_args.pack_fds);
3826 		if (err)
3827 			return err;
3828 		tog_free_refs();
3829 		err = tog_load_refs(s->repo, 0);
3830 		if (err)
3831 			return err;
3832 		err = got_commit_graph_open(&s->thread_args.graph,
3833 		    s->in_repo_path, !s->log_branches);
3834 		if (err)
3835 			return err;
3836 		err = got_commit_graph_iter_start(s->thread_args.graph,
3837 		    s->start_id, s->repo, NULL, NULL);
3838 		if (err)
3839 			return err;
3840 		free_commits(&s->real_commits);
3841 		free_commits(&s->limit_commits);
3842 		s->first_displayed_entry = NULL;
3843 		s->last_displayed_entry = NULL;
3844 		s->selected_entry = NULL;
3845 		s->selected = 0;
3846 		s->thread_args.log_complete = 0;
3847 		s->quit = 0;
3848 		s->thread_args.commits_needed = view->lines;
3849 		s->matched_entry = NULL;
3850 		s->search_entry = NULL;
3851 		view->offset = 0;
3852 		break;
3853 	case 'R':
3854 		view->count = 0;
3855 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3856 		break;
3857 	default:
3858 		view->count = 0;
3859 		break;
3860 	}
3861 
3862 	return err;
3863 }
3864 
3865 static const struct got_error *
3866 apply_unveil(const char *repo_path, const char *worktree_path)
3867 {
3868 	const struct got_error *error;
3869 
3870 #ifdef PROFILE
3871 	if (unveil("gmon.out", "rwc") != 0)
3872 		return got_error_from_errno2("unveil", "gmon.out");
3873 #endif
3874 	if (repo_path && unveil(repo_path, "r") != 0)
3875 		return got_error_from_errno2("unveil", repo_path);
3876 
3877 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3878 		return got_error_from_errno2("unveil", worktree_path);
3879 
3880 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3881 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3882 
3883 	error = got_privsep_unveil_exec_helpers();
3884 	if (error != NULL)
3885 		return error;
3886 
3887 	if (unveil(NULL, NULL) != 0)
3888 		return got_error_from_errno("unveil");
3889 
3890 	return NULL;
3891 }
3892 
3893 static void
3894 init_curses(void)
3895 {
3896 	/*
3897 	 * Override default signal handlers before starting ncurses.
3898 	 * This should prevent ncurses from installing its own
3899 	 * broken cleanup() signal handler.
3900 	 */
3901 	signal(SIGWINCH, tog_sigwinch);
3902 	signal(SIGPIPE, tog_sigpipe);
3903 	signal(SIGCONT, tog_sigcont);
3904 	signal(SIGINT, tog_sigint);
3905 	signal(SIGTERM, tog_sigterm);
3906 
3907 	initscr();
3908 	cbreak();
3909 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3910 	noecho();
3911 	nonl();
3912 	intrflush(stdscr, FALSE);
3913 	keypad(stdscr, TRUE);
3914 	curs_set(0);
3915 	if (getenv("TOG_COLORS") != NULL) {
3916 		start_color();
3917 		use_default_colors();
3918 	}
3919 }
3920 
3921 static const struct got_error *
3922 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3923     struct got_repository *repo, struct got_worktree *worktree)
3924 {
3925 	const struct got_error *err = NULL;
3926 
3927 	if (argc == 0) {
3928 		*in_repo_path = strdup("/");
3929 		if (*in_repo_path == NULL)
3930 			return got_error_from_errno("strdup");
3931 		return NULL;
3932 	}
3933 
3934 	if (worktree) {
3935 		const char *prefix = got_worktree_get_path_prefix(worktree);
3936 		char *p;
3937 
3938 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3939 		if (err)
3940 			return err;
3941 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3942 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3943 		    p) == -1) {
3944 			err = got_error_from_errno("asprintf");
3945 			*in_repo_path = NULL;
3946 		}
3947 		free(p);
3948 	} else
3949 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3950 
3951 	return err;
3952 }
3953 
3954 static const struct got_error *
3955 cmd_log(int argc, char *argv[])
3956 {
3957 	const struct got_error *error;
3958 	struct got_repository *repo = NULL;
3959 	struct got_worktree *worktree = NULL;
3960 	struct got_object_id *start_id = NULL;
3961 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3962 	char *start_commit = NULL, *label = NULL;
3963 	struct got_reference *ref = NULL;
3964 	const char *head_ref_name = NULL;
3965 	int ch, log_branches = 0;
3966 	struct tog_view *view;
3967 	int *pack_fds = NULL;
3968 
3969 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3970 		switch (ch) {
3971 		case 'b':
3972 			log_branches = 1;
3973 			break;
3974 		case 'c':
3975 			start_commit = optarg;
3976 			break;
3977 		case 'r':
3978 			repo_path = realpath(optarg, NULL);
3979 			if (repo_path == NULL)
3980 				return got_error_from_errno2("realpath",
3981 				    optarg);
3982 			break;
3983 		default:
3984 			usage_log();
3985 			/* NOTREACHED */
3986 		}
3987 	}
3988 
3989 	argc -= optind;
3990 	argv += optind;
3991 
3992 	if (argc > 1)
3993 		usage_log();
3994 
3995 	error = got_repo_pack_fds_open(&pack_fds);
3996 	if (error != NULL)
3997 		goto done;
3998 
3999 	if (repo_path == NULL) {
4000 		cwd = getcwd(NULL, 0);
4001 		if (cwd == NULL)
4002 			return got_error_from_errno("getcwd");
4003 		error = got_worktree_open(&worktree, cwd);
4004 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4005 			goto done;
4006 		if (worktree)
4007 			repo_path =
4008 			    strdup(got_worktree_get_repo_path(worktree));
4009 		else
4010 			repo_path = strdup(cwd);
4011 		if (repo_path == NULL) {
4012 			error = got_error_from_errno("strdup");
4013 			goto done;
4014 		}
4015 	}
4016 
4017 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4018 	if (error != NULL)
4019 		goto done;
4020 
4021 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4022 	    repo, worktree);
4023 	if (error)
4024 		goto done;
4025 
4026 	init_curses();
4027 
4028 	error = apply_unveil(got_repo_get_path(repo),
4029 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4030 	if (error)
4031 		goto done;
4032 
4033 	/* already loaded by tog_log_with_path()? */
4034 	if (TAILQ_EMPTY(&tog_refs)) {
4035 		error = tog_load_refs(repo, 0);
4036 		if (error)
4037 			goto done;
4038 	}
4039 
4040 	if (start_commit == NULL) {
4041 		error = got_repo_match_object_id(&start_id, &label,
4042 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4043 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4044 		if (error)
4045 			goto done;
4046 		head_ref_name = label;
4047 	} else {
4048 		error = got_ref_open(&ref, repo, start_commit, 0);
4049 		if (error == NULL)
4050 			head_ref_name = got_ref_get_name(ref);
4051 		else if (error->code != GOT_ERR_NOT_REF)
4052 			goto done;
4053 		error = got_repo_match_object_id(&start_id, NULL,
4054 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4055 		if (error)
4056 			goto done;
4057 	}
4058 
4059 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4060 	if (view == NULL) {
4061 		error = got_error_from_errno("view_open");
4062 		goto done;
4063 	}
4064 	error = open_log_view(view, start_id, repo, head_ref_name,
4065 	    in_repo_path, log_branches);
4066 	if (error)
4067 		goto done;
4068 	if (worktree) {
4069 		/* Release work tree lock. */
4070 		got_worktree_close(worktree);
4071 		worktree = NULL;
4072 	}
4073 	error = view_loop(view);
4074 done:
4075 	free(in_repo_path);
4076 	free(repo_path);
4077 	free(cwd);
4078 	free(start_id);
4079 	free(label);
4080 	if (ref)
4081 		got_ref_close(ref);
4082 	if (repo) {
4083 		const struct got_error *close_err = got_repo_close(repo);
4084 		if (error == NULL)
4085 			error = close_err;
4086 	}
4087 	if (worktree)
4088 		got_worktree_close(worktree);
4089 	if (pack_fds) {
4090 		const struct got_error *pack_err =
4091 		    got_repo_pack_fds_close(pack_fds);
4092 		if (error == NULL)
4093 			error = pack_err;
4094 	}
4095 	tog_free_refs();
4096 	return error;
4097 }
4098 
4099 __dead static void
4100 usage_diff(void)
4101 {
4102 	endwin();
4103 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4104 	    "object1 object2\n", getprogname());
4105 	exit(1);
4106 }
4107 
4108 static int
4109 match_line(const char *line, regex_t *regex, size_t nmatch,
4110     regmatch_t *regmatch)
4111 {
4112 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4113 }
4114 
4115 static struct tog_color *
4116 match_color(struct tog_colors *colors, const char *line)
4117 {
4118 	struct tog_color *tc = NULL;
4119 
4120 	STAILQ_FOREACH(tc, colors, entry) {
4121 		if (match_line(line, &tc->regex, 0, NULL))
4122 			return tc;
4123 	}
4124 
4125 	return NULL;
4126 }
4127 
4128 static const struct got_error *
4129 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4130     WINDOW *window, int skipcol, regmatch_t *regmatch)
4131 {
4132 	const struct got_error *err = NULL;
4133 	char *exstr = NULL;
4134 	wchar_t *wline = NULL;
4135 	int rme, rms, n, width, scrollx;
4136 	int width0 = 0, width1 = 0, width2 = 0;
4137 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4138 
4139 	*wtotal = 0;
4140 
4141 	rms = regmatch->rm_so;
4142 	rme = regmatch->rm_eo;
4143 
4144 	err = expand_tab(&exstr, line);
4145 	if (err)
4146 		return err;
4147 
4148 	/* Split the line into 3 segments, according to match offsets. */
4149 	seg0 = strndup(exstr, rms);
4150 	if (seg0 == NULL) {
4151 		err = got_error_from_errno("strndup");
4152 		goto done;
4153 	}
4154 	seg1 = strndup(exstr + rms, rme - rms);
4155 	if (seg1 == NULL) {
4156 		err = got_error_from_errno("strndup");
4157 		goto done;
4158 	}
4159 	seg2 = strdup(exstr + rme);
4160 	if (seg2 == NULL) {
4161 		err = got_error_from_errno("strndup");
4162 		goto done;
4163 	}
4164 
4165 	/* draw up to matched token if we haven't scrolled past it */
4166 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4167 	    col_tab_align, 1);
4168 	if (err)
4169 		goto done;
4170 	n = MAX(width0 - skipcol, 0);
4171 	if (n) {
4172 		free(wline);
4173 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4174 		    wlimit, col_tab_align, 1);
4175 		if (err)
4176 			goto done;
4177 		waddwstr(window, &wline[scrollx]);
4178 		wlimit -= width;
4179 		*wtotal += width;
4180 	}
4181 
4182 	if (wlimit > 0) {
4183 		int i = 0, w = 0;
4184 		size_t wlen;
4185 
4186 		free(wline);
4187 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4188 		    col_tab_align, 1);
4189 		if (err)
4190 			goto done;
4191 		wlen = wcslen(wline);
4192 		while (i < wlen) {
4193 			width = wcwidth(wline[i]);
4194 			if (width == -1) {
4195 				/* should not happen, tabs are expanded */
4196 				err = got_error(GOT_ERR_RANGE);
4197 				goto done;
4198 			}
4199 			if (width0 + w + width > skipcol)
4200 				break;
4201 			w += width;
4202 			i++;
4203 		}
4204 		/* draw (visible part of) matched token (if scrolled into it) */
4205 		if (width1 - w > 0) {
4206 			wattron(window, A_STANDOUT);
4207 			waddwstr(window, &wline[i]);
4208 			wattroff(window, A_STANDOUT);
4209 			wlimit -= (width1 - w);
4210 			*wtotal += (width1 - w);
4211 		}
4212 	}
4213 
4214 	if (wlimit > 0) {  /* draw rest of line */
4215 		free(wline);
4216 		if (skipcol > width0 + width1) {
4217 			err = format_line(&wline, &width2, &scrollx, seg2,
4218 			    skipcol - (width0 + width1), wlimit,
4219 			    col_tab_align, 1);
4220 			if (err)
4221 				goto done;
4222 			waddwstr(window, &wline[scrollx]);
4223 		} else {
4224 			err = format_line(&wline, &width2, NULL, seg2, 0,
4225 			    wlimit, col_tab_align, 1);
4226 			if (err)
4227 				goto done;
4228 			waddwstr(window, wline);
4229 		}
4230 		*wtotal += width2;
4231 	}
4232 done:
4233 	free(wline);
4234 	free(exstr);
4235 	free(seg0);
4236 	free(seg1);
4237 	free(seg2);
4238 	return err;
4239 }
4240 
4241 static int
4242 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4243 {
4244 	FILE	*f = NULL;
4245 	int	*eof, *first, *selected;
4246 
4247 	if (view->type == TOG_VIEW_DIFF) {
4248 		struct tog_diff_view_state *s = &view->state.diff;
4249 
4250 		first = &s->first_displayed_line;
4251 		selected = first;
4252 		eof = &s->eof;
4253 		f = s->f;
4254 	} else if (view->type == TOG_VIEW_HELP) {
4255 		struct tog_help_view_state *s = &view->state.help;
4256 
4257 		first = &s->first_displayed_line;
4258 		selected = first;
4259 		eof = &s->eof;
4260 		f = s->f;
4261 	} else if (view->type == TOG_VIEW_BLAME) {
4262 		struct tog_blame_view_state *s = &view->state.blame;
4263 
4264 		first = &s->first_displayed_line;
4265 		selected = &s->selected_line;
4266 		eof = &s->eof;
4267 		f = s->blame.f;
4268 	} else
4269 		return 0;
4270 
4271 	/* Center gline in the middle of the page like vi(1). */
4272 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4273 		return 0;
4274 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4275 		rewind(f);
4276 		*eof = 0;
4277 		*first = 1;
4278 		*lineno = 0;
4279 		*nprinted = 0;
4280 		return 0;
4281 	}
4282 
4283 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4284 		view->gline : (view->nlines - 3) / 2 + 1;
4285 	view->gline = 0;
4286 
4287 	return 1;
4288 }
4289 
4290 static const struct got_error *
4291 draw_file(struct tog_view *view, const char *header)
4292 {
4293 	struct tog_diff_view_state *s = &view->state.diff;
4294 	regmatch_t *regmatch = &view->regmatch;
4295 	const struct got_error *err;
4296 	int nprinted = 0;
4297 	char *line;
4298 	size_t linesize = 0;
4299 	ssize_t linelen;
4300 	wchar_t *wline;
4301 	int width;
4302 	int max_lines = view->nlines;
4303 	int nlines = s->nlines;
4304 	off_t line_offset;
4305 
4306 	s->lineno = s->first_displayed_line - 1;
4307 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4308 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4309 		return got_error_from_errno("fseek");
4310 
4311 	werase(view->window);
4312 
4313 	if (view->gline > s->nlines - 1)
4314 		view->gline = s->nlines - 1;
4315 
4316 	if (header) {
4317 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4318 		    1 : view->gline - (view->nlines - 3) / 2 :
4319 		    s->lineno + s->selected_line;
4320 
4321 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4322 			return got_error_from_errno("asprintf");
4323 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4324 		    0, 0);
4325 		free(line);
4326 		if (err)
4327 			return err;
4328 
4329 		if (view_needs_focus_indication(view))
4330 			wstandout(view->window);
4331 		waddwstr(view->window, wline);
4332 		free(wline);
4333 		wline = NULL;
4334 		while (width++ < view->ncols)
4335 			waddch(view->window, ' ');
4336 		if (view_needs_focus_indication(view))
4337 			wstandend(view->window);
4338 
4339 		if (max_lines <= 1)
4340 			return NULL;
4341 		max_lines--;
4342 	}
4343 
4344 	s->eof = 0;
4345 	view->maxx = 0;
4346 	line = NULL;
4347 	while (max_lines > 0 && nprinted < max_lines) {
4348 		enum got_diff_line_type linetype;
4349 		attr_t attr = 0;
4350 
4351 		linelen = getline(&line, &linesize, s->f);
4352 		if (linelen == -1) {
4353 			if (feof(s->f)) {
4354 				s->eof = 1;
4355 				break;
4356 			}
4357 			free(line);
4358 			return got_ferror(s->f, GOT_ERR_IO);
4359 		}
4360 
4361 		if (++s->lineno < s->first_displayed_line)
4362 			continue;
4363 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4364 			continue;
4365 		if (s->lineno == view->hiline)
4366 			attr = A_STANDOUT;
4367 
4368 		/* Set view->maxx based on full line length. */
4369 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4370 		    view->x ? 1 : 0);
4371 		if (err) {
4372 			free(line);
4373 			return err;
4374 		}
4375 		view->maxx = MAX(view->maxx, width);
4376 		free(wline);
4377 		wline = NULL;
4378 
4379 		linetype = s->lines[s->lineno].type;
4380 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4381 		    linetype < GOT_DIFF_LINE_CONTEXT)
4382 			attr |= COLOR_PAIR(linetype);
4383 		if (attr)
4384 			wattron(view->window, attr);
4385 		if (s->first_displayed_line + nprinted == s->matched_line &&
4386 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4387 			err = add_matched_line(&width, line, view->ncols, 0,
4388 			    view->window, view->x, regmatch);
4389 			if (err) {
4390 				free(line);
4391 				return err;
4392 			}
4393 		} else {
4394 			int skip;
4395 			err = format_line(&wline, &width, &skip, line,
4396 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4397 			if (err) {
4398 				free(line);
4399 				return err;
4400 			}
4401 			waddwstr(view->window, &wline[skip]);
4402 			free(wline);
4403 			wline = NULL;
4404 		}
4405 		if (s->lineno == view->hiline) {
4406 			/* highlight full gline length */
4407 			while (width++ < view->ncols)
4408 				waddch(view->window, ' ');
4409 		} else {
4410 			if (width <= view->ncols - 1)
4411 				waddch(view->window, '\n');
4412 		}
4413 		if (attr)
4414 			wattroff(view->window, attr);
4415 		if (++nprinted == 1)
4416 			s->first_displayed_line = s->lineno;
4417 	}
4418 	free(line);
4419 	if (nprinted >= 1)
4420 		s->last_displayed_line = s->first_displayed_line +
4421 		    (nprinted - 1);
4422 	else
4423 		s->last_displayed_line = s->first_displayed_line;
4424 
4425 	view_border(view);
4426 
4427 	if (s->eof) {
4428 		while (nprinted < view->nlines) {
4429 			waddch(view->window, '\n');
4430 			nprinted++;
4431 		}
4432 
4433 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4434 		    view->ncols, 0, 0);
4435 		if (err) {
4436 			return err;
4437 		}
4438 
4439 		wstandout(view->window);
4440 		waddwstr(view->window, wline);
4441 		free(wline);
4442 		wline = NULL;
4443 		wstandend(view->window);
4444 	}
4445 
4446 	return NULL;
4447 }
4448 
4449 static char *
4450 get_datestr(time_t *time, char *datebuf)
4451 {
4452 	struct tm mytm, *tm;
4453 	char *p, *s;
4454 
4455 	tm = gmtime_r(time, &mytm);
4456 	if (tm == NULL)
4457 		return NULL;
4458 	s = asctime_r(tm, datebuf);
4459 	if (s == NULL)
4460 		return NULL;
4461 	p = strchr(s, '\n');
4462 	if (p)
4463 		*p = '\0';
4464 	return s;
4465 }
4466 
4467 static const struct got_error *
4468 get_changed_paths(struct got_pathlist_head *paths,
4469     struct got_commit_object *commit, struct got_repository *repo,
4470     struct got_diffstat_cb_arg *dsa)
4471 {
4472 	const struct got_error *err = NULL;
4473 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4474 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4475 	struct got_object_qid *qid;
4476 	FILE *f1 = NULL, *f2 = NULL;
4477 	int fd1 = -1, fd2 = -1;
4478 
4479 	f1 = got_opentemp();
4480 	if (f1 == NULL) {
4481 		err = got_error_from_errno("got_opentemp");
4482 		goto done;
4483 	}
4484 	f2 = got_opentemp();
4485 	if (f2 == NULL) {
4486 		err = got_error_from_errno("got_opentemp");
4487 		goto done;
4488 	}
4489 
4490 	fd1 = got_opentempfd();
4491 	if (fd1 == -1) {
4492 		err = got_error_from_errno("got_opentempfd");
4493 		goto done;
4494 	}
4495 	fd2 = got_opentempfd();
4496 	if (fd2 == -1) {
4497 		err = got_error_from_errno("got_opentempfd");
4498 		goto done;
4499 	}
4500 
4501 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4502 	if (qid != NULL) {
4503 		struct got_commit_object *pcommit;
4504 		err = got_object_open_as_commit(&pcommit, repo,
4505 		    &qid->id);
4506 		if (err)
4507 			return err;
4508 
4509 		tree_id1 = got_object_id_dup(
4510 		    got_object_commit_get_tree_id(pcommit));
4511 		if (tree_id1 == NULL) {
4512 			got_object_commit_close(pcommit);
4513 			return got_error_from_errno("got_object_id_dup");
4514 		}
4515 		got_object_commit_close(pcommit);
4516 
4517 	}
4518 
4519 	if (tree_id1) {
4520 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4521 		if (err)
4522 			goto done;
4523 	}
4524 
4525 	tree_id2 = got_object_commit_get_tree_id(commit);
4526 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4527 	if (err)
4528 		goto done;
4529 
4530 	err = got_diff_tree(tree1, tree2, f1, f2, fd1, fd2, "", "", repo,
4531 	    got_diff_tree_compute_diffstat, dsa, 1);
4532 done:
4533 	if (tree1)
4534 		got_object_tree_close(tree1);
4535 	if (tree2)
4536 		got_object_tree_close(tree2);
4537 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
4538 		err = got_error_from_errno("close");
4539 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
4540 		err = got_error_from_errno("close");
4541 	if (f1 && fclose(f1) == EOF && err == NULL)
4542 		err = got_error_from_errno("fclose");
4543 	if (f2 && fclose(f2) == EOF && err == NULL)
4544 		err = got_error_from_errno("fclose");
4545 	free(tree_id1);
4546 	return err;
4547 }
4548 
4549 static const struct got_error *
4550 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4551     off_t off, uint8_t type)
4552 {
4553 	struct got_diff_line *p;
4554 
4555 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4556 	if (p == NULL)
4557 		return got_error_from_errno("reallocarray");
4558 	*lines = p;
4559 	(*lines)[*nlines].offset = off;
4560 	(*lines)[*nlines].type = type;
4561 	(*nlines)++;
4562 
4563 	return NULL;
4564 }
4565 
4566 static const struct got_error *
4567 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4568     struct got_object_id *commit_id, struct got_reflist_head *refs,
4569     struct got_repository *repo, int ignore_ws, int force_text_diff,
4570     FILE *outfile)
4571 {
4572 	const struct got_error *err = NULL;
4573 	char datebuf[26], *datestr;
4574 	struct got_commit_object *commit;
4575 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4576 	time_t committer_time;
4577 	const char *author, *committer;
4578 	char *refs_str = NULL;
4579 	struct got_pathlist_head changed_paths;
4580 	struct got_pathlist_entry *pe;
4581 	struct got_diffstat_cb_arg dsa = { 0, 0, 0, 0, 0, 0, &changed_paths,
4582 	    ignore_ws, force_text_diff, tog_diff_algo };
4583 	off_t outoff = 0;
4584 	int n;
4585 
4586 	TAILQ_INIT(&changed_paths);
4587 
4588 	if (refs) {
4589 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4590 		if (err)
4591 			return err;
4592 	}
4593 
4594 	err = got_object_open_as_commit(&commit, repo, commit_id);
4595 	if (err)
4596 		return err;
4597 
4598 	err = got_object_id_str(&id_str, commit_id);
4599 	if (err) {
4600 		err = got_error_from_errno("got_object_id_str");
4601 		goto done;
4602 	}
4603 
4604 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4605 	if (err)
4606 		goto done;
4607 
4608 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4609 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4610 	if (n < 0) {
4611 		err = got_error_from_errno("fprintf");
4612 		goto done;
4613 	}
4614 	outoff += n;
4615 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4616 	if (err)
4617 		goto done;
4618 
4619 	n = fprintf(outfile, "from: %s\n",
4620 	    got_object_commit_get_author(commit));
4621 	if (n < 0) {
4622 		err = got_error_from_errno("fprintf");
4623 		goto done;
4624 	}
4625 	outoff += n;
4626 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4627 	if (err)
4628 		goto done;
4629 
4630 	author = got_object_commit_get_author(commit);
4631 	committer = got_object_commit_get_committer(commit);
4632 	if (strcmp(author, committer) != 0) {
4633 		n = fprintf(outfile, "via: %s\n", committer);
4634 		if (n < 0) {
4635 			err = got_error_from_errno("fprintf");
4636 			goto done;
4637 		}
4638 		outoff += n;
4639 		err = add_line_metadata(lines, nlines, outoff,
4640 		    GOT_DIFF_LINE_AUTHOR);
4641 		if (err)
4642 			goto done;
4643 	}
4644 	committer_time = got_object_commit_get_committer_time(commit);
4645 	datestr = get_datestr(&committer_time, datebuf);
4646 	if (datestr) {
4647 		n = fprintf(outfile, "date: %s UTC\n", datestr);
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_DATE);
4655 		if (err)
4656 			goto done;
4657 	}
4658 	if (got_object_commit_get_nparents(commit) > 1) {
4659 		const struct got_object_id_queue *parent_ids;
4660 		struct got_object_qid *qid;
4661 		int pn = 1;
4662 		parent_ids = got_object_commit_get_parent_ids(commit);
4663 		STAILQ_FOREACH(qid, parent_ids, entry) {
4664 			err = got_object_id_str(&id_str, &qid->id);
4665 			if (err)
4666 				goto done;
4667 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4668 			if (n < 0) {
4669 				err = got_error_from_errno("fprintf");
4670 				goto done;
4671 			}
4672 			outoff += n;
4673 			err = add_line_metadata(lines, nlines, outoff,
4674 			    GOT_DIFF_LINE_META);
4675 			if (err)
4676 				goto done;
4677 			free(id_str);
4678 			id_str = NULL;
4679 		}
4680 	}
4681 
4682 	err = got_object_commit_get_logmsg(&logmsg, commit);
4683 	if (err)
4684 		goto done;
4685 	s = logmsg;
4686 	while ((line = strsep(&s, "\n")) != NULL) {
4687 		n = fprintf(outfile, "%s\n", line);
4688 		if (n < 0) {
4689 			err = got_error_from_errno("fprintf");
4690 			goto done;
4691 		}
4692 		outoff += n;
4693 		err = add_line_metadata(lines, nlines, outoff,
4694 		    GOT_DIFF_LINE_LOGMSG);
4695 		if (err)
4696 			goto done;
4697 	}
4698 
4699 	err = get_changed_paths(&changed_paths, commit, repo, &dsa);
4700 	if (err)
4701 		goto done;
4702 
4703 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4704 		struct got_diff_changed_path *cp = pe->data;
4705 		int pad = dsa.max_path_len - pe->path_len + 1;
4706 
4707 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4708 		    pe->path, pad, ' ', dsa.add_cols + 1, cp->add,
4709 		    dsa.rm_cols + 1, cp->rm);
4710 		if (n < 0) {
4711 			err = got_error_from_errno("fprintf");
4712 			goto done;
4713 		}
4714 		outoff += n;
4715 		err = add_line_metadata(lines, nlines, outoff,
4716 		    GOT_DIFF_LINE_CHANGES);
4717 		if (err)
4718 			goto done;
4719 	}
4720 
4721 	fputc('\n', outfile);
4722 	outoff++;
4723 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4724 	if (err)
4725 		goto done;
4726 
4727 	n = fprintf(outfile,
4728 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
4729 	    dsa.nfiles, dsa.nfiles > 1 ? "s" : "", dsa.ins,
4730 	    dsa.ins != 1 ? "s" : "", dsa.del, dsa.del != 1 ? "s" : "");
4731 	if (n < 0) {
4732 		err = got_error_from_errno("fprintf");
4733 		goto done;
4734 	}
4735 	outoff += n;
4736 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4737 	if (err)
4738 		goto done;
4739 
4740 	fputc('\n', outfile);
4741 	outoff++;
4742 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4743 done:
4744 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
4745 	free(id_str);
4746 	free(logmsg);
4747 	free(refs_str);
4748 	got_object_commit_close(commit);
4749 	if (err) {
4750 		free(*lines);
4751 		*lines = NULL;
4752 		*nlines = 0;
4753 	}
4754 	return err;
4755 }
4756 
4757 static const struct got_error *
4758 create_diff(struct tog_diff_view_state *s)
4759 {
4760 	const struct got_error *err = NULL;
4761 	FILE *f = NULL;
4762 	int obj_type;
4763 
4764 	free(s->lines);
4765 	s->lines = malloc(sizeof(*s->lines));
4766 	if (s->lines == NULL)
4767 		return got_error_from_errno("malloc");
4768 	s->nlines = 0;
4769 
4770 	f = got_opentemp();
4771 	if (f == NULL) {
4772 		err = got_error_from_errno("got_opentemp");
4773 		goto done;
4774 	}
4775 	if (s->f && fclose(s->f) == EOF) {
4776 		err = got_error_from_errno("fclose");
4777 		goto done;
4778 	}
4779 	s->f = f;
4780 
4781 	if (s->id1)
4782 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4783 	else
4784 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4785 	if (err)
4786 		goto done;
4787 
4788 	switch (obj_type) {
4789 	case GOT_OBJ_TYPE_BLOB:
4790 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4791 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4792 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4793 		    s->ignore_whitespace, s->force_text_diff, 0, NULL, s->repo,
4794 		    s->f);
4795 		break;
4796 	case GOT_OBJ_TYPE_TREE:
4797 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4798 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4799 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4800 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4801 		break;
4802 	case GOT_OBJ_TYPE_COMMIT: {
4803 		const struct got_object_id_queue *parent_ids;
4804 		struct got_object_qid *pid;
4805 		struct got_commit_object *commit2;
4806 		struct got_reflist_head *refs;
4807 
4808 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4809 		if (err)
4810 			goto done;
4811 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4812 		/* Show commit info if we're diffing to a parent/root commit. */
4813 		if (s->id1 == NULL) {
4814 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4815 			    refs, s->repo, s->ignore_whitespace,
4816 			    s->force_text_diff, s->f);
4817 			if (err)
4818 				goto done;
4819 		} else {
4820 			parent_ids = got_object_commit_get_parent_ids(commit2);
4821 			STAILQ_FOREACH(pid, parent_ids, entry) {
4822 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4823 					err = write_commit_info(&s->lines,
4824 					    &s->nlines, s->id2, refs, s->repo,
4825 					    s->ignore_whitespace,
4826 					    s->force_text_diff, s->f);
4827 					if (err)
4828 						goto done;
4829 					break;
4830 				}
4831 			}
4832 		}
4833 		got_object_commit_close(commit2);
4834 
4835 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4836 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4837 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4838 		    s->force_text_diff, 0, NULL, s->repo, s->f);
4839 		break;
4840 	}
4841 	default:
4842 		err = got_error(GOT_ERR_OBJ_TYPE);
4843 		break;
4844 	}
4845 done:
4846 	if (s->f && fflush(s->f) != 0 && err == NULL)
4847 		err = got_error_from_errno("fflush");
4848 	return err;
4849 }
4850 
4851 static void
4852 diff_view_indicate_progress(struct tog_view *view)
4853 {
4854 	mvwaddstr(view->window, 0, 0, "diffing...");
4855 	update_panels();
4856 	doupdate();
4857 }
4858 
4859 static const struct got_error *
4860 search_start_diff_view(struct tog_view *view)
4861 {
4862 	struct tog_diff_view_state *s = &view->state.diff;
4863 
4864 	s->matched_line = 0;
4865 	return NULL;
4866 }
4867 
4868 static void
4869 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4870     size_t *nlines, int **first, int **last, int **match, int **selected)
4871 {
4872 	struct tog_diff_view_state *s = &view->state.diff;
4873 
4874 	*f = s->f;
4875 	*nlines = s->nlines;
4876 	*line_offsets = NULL;
4877 	*match = &s->matched_line;
4878 	*first = &s->first_displayed_line;
4879 	*last = &s->last_displayed_line;
4880 	*selected = &s->selected_line;
4881 }
4882 
4883 static const struct got_error *
4884 search_next_view_match(struct tog_view *view)
4885 {
4886 	const struct got_error *err = NULL;
4887 	FILE *f;
4888 	int lineno;
4889 	char *line = NULL;
4890 	size_t linesize = 0;
4891 	ssize_t linelen;
4892 	off_t *line_offsets;
4893 	size_t nlines = 0;
4894 	int *first, *last, *match, *selected;
4895 
4896 	if (!view->search_setup)
4897 		return got_error_msg(GOT_ERR_NOT_IMPL,
4898 		    "view search not supported");
4899 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4900 	    &match, &selected);
4901 
4902 	if (!view->searching) {
4903 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4904 		return NULL;
4905 	}
4906 
4907 	if (*match) {
4908 		if (view->searching == TOG_SEARCH_FORWARD)
4909 			lineno = *match + 1;
4910 		else
4911 			lineno = *match - 1;
4912 	} else
4913 		lineno = *first - 1 + *selected;
4914 
4915 	while (1) {
4916 		off_t offset;
4917 
4918 		if (lineno <= 0 || lineno > nlines) {
4919 			if (*match == 0) {
4920 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4921 				break;
4922 			}
4923 
4924 			if (view->searching == TOG_SEARCH_FORWARD)
4925 				lineno = 1;
4926 			else
4927 				lineno = nlines;
4928 		}
4929 
4930 		offset = view->type == TOG_VIEW_DIFF ?
4931 		    view->state.diff.lines[lineno - 1].offset :
4932 		    line_offsets[lineno - 1];
4933 		if (fseeko(f, offset, SEEK_SET) != 0) {
4934 			free(line);
4935 			return got_error_from_errno("fseeko");
4936 		}
4937 		linelen = getline(&line, &linesize, f);
4938 		if (linelen != -1) {
4939 			char *exstr;
4940 			err = expand_tab(&exstr, line);
4941 			if (err)
4942 				break;
4943 			if (match_line(exstr, &view->regex, 1,
4944 			    &view->regmatch)) {
4945 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4946 				*match = lineno;
4947 				free(exstr);
4948 				break;
4949 			}
4950 			free(exstr);
4951 		}
4952 		if (view->searching == TOG_SEARCH_FORWARD)
4953 			lineno++;
4954 		else
4955 			lineno--;
4956 	}
4957 	free(line);
4958 
4959 	if (*match) {
4960 		*first = *match;
4961 		*selected = 1;
4962 	}
4963 
4964 	return err;
4965 }
4966 
4967 static const struct got_error *
4968 close_diff_view(struct tog_view *view)
4969 {
4970 	const struct got_error *err = NULL;
4971 	struct tog_diff_view_state *s = &view->state.diff;
4972 
4973 	free(s->id1);
4974 	s->id1 = NULL;
4975 	free(s->id2);
4976 	s->id2 = NULL;
4977 	if (s->f && fclose(s->f) == EOF)
4978 		err = got_error_from_errno("fclose");
4979 	s->f = NULL;
4980 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4981 		err = got_error_from_errno("fclose");
4982 	s->f1 = NULL;
4983 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4984 		err = got_error_from_errno("fclose");
4985 	s->f2 = NULL;
4986 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4987 		err = got_error_from_errno("close");
4988 	s->fd1 = -1;
4989 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4990 		err = got_error_from_errno("close");
4991 	s->fd2 = -1;
4992 	free(s->lines);
4993 	s->lines = NULL;
4994 	s->nlines = 0;
4995 	return err;
4996 }
4997 
4998 static const struct got_error *
4999 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5000     struct got_object_id *id2, const char *label1, const char *label2,
5001     int diff_context, int ignore_whitespace, int force_text_diff,
5002     struct tog_view *parent_view, struct got_repository *repo)
5003 {
5004 	const struct got_error *err;
5005 	struct tog_diff_view_state *s = &view->state.diff;
5006 
5007 	memset(s, 0, sizeof(*s));
5008 	s->fd1 = -1;
5009 	s->fd2 = -1;
5010 
5011 	if (id1 != NULL && id2 != NULL) {
5012 	    int type1, type2;
5013 	    err = got_object_get_type(&type1, repo, id1);
5014 	    if (err)
5015 		return err;
5016 	    err = got_object_get_type(&type2, repo, id2);
5017 	    if (err)
5018 		return err;
5019 
5020 	    if (type1 != type2)
5021 		return got_error(GOT_ERR_OBJ_TYPE);
5022 	}
5023 	s->first_displayed_line = 1;
5024 	s->last_displayed_line = view->nlines;
5025 	s->selected_line = 1;
5026 	s->repo = repo;
5027 	s->id1 = id1;
5028 	s->id2 = id2;
5029 	s->label1 = label1;
5030 	s->label2 = label2;
5031 
5032 	if (id1) {
5033 		s->id1 = got_object_id_dup(id1);
5034 		if (s->id1 == NULL)
5035 			return got_error_from_errno("got_object_id_dup");
5036 	} else
5037 		s->id1 = NULL;
5038 
5039 	s->id2 = got_object_id_dup(id2);
5040 	if (s->id2 == NULL) {
5041 		err = got_error_from_errno("got_object_id_dup");
5042 		goto done;
5043 	}
5044 
5045 	s->f1 = got_opentemp();
5046 	if (s->f1 == NULL) {
5047 		err = got_error_from_errno("got_opentemp");
5048 		goto done;
5049 	}
5050 
5051 	s->f2 = got_opentemp();
5052 	if (s->f2 == NULL) {
5053 		err = got_error_from_errno("got_opentemp");
5054 		goto done;
5055 	}
5056 
5057 	s->fd1 = got_opentempfd();
5058 	if (s->fd1 == -1) {
5059 		err = got_error_from_errno("got_opentempfd");
5060 		goto done;
5061 	}
5062 
5063 	s->fd2 = got_opentempfd();
5064 	if (s->fd2 == -1) {
5065 		err = got_error_from_errno("got_opentempfd");
5066 		goto done;
5067 	}
5068 
5069 	s->diff_context = diff_context;
5070 	s->ignore_whitespace = ignore_whitespace;
5071 	s->force_text_diff = force_text_diff;
5072 	s->parent_view = parent_view;
5073 	s->repo = repo;
5074 
5075 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5076 		int rc;
5077 
5078 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5079 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5080 		if (rc != ERR)
5081 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5082 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5083 		if (rc != ERR)
5084 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5085 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5086 		if (rc != ERR)
5087 			rc = init_pair(GOT_DIFF_LINE_META,
5088 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5089 		if (rc != ERR)
5090 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5091 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5092 		if (rc != ERR)
5093 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5094 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5095 		if (rc != ERR)
5096 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5097 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5098 		if (rc != ERR)
5099 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5100 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5101 		if (rc != ERR)
5102 			rc = init_pair(GOT_DIFF_LINE_DATE,
5103 			    get_color_value("TOG_COLOR_DATE"), -1);
5104 		if (rc == ERR) {
5105 			err = got_error(GOT_ERR_RANGE);
5106 			goto done;
5107 		}
5108 	}
5109 
5110 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5111 	    view_is_splitscreen(view))
5112 		show_log_view(parent_view); /* draw border */
5113 	diff_view_indicate_progress(view);
5114 
5115 	err = create_diff(s);
5116 
5117 	view->show = show_diff_view;
5118 	view->input = input_diff_view;
5119 	view->reset = reset_diff_view;
5120 	view->close = close_diff_view;
5121 	view->search_start = search_start_diff_view;
5122 	view->search_setup = search_setup_diff_view;
5123 	view->search_next = search_next_view_match;
5124 done:
5125 	if (err)
5126 		close_diff_view(view);
5127 	return err;
5128 }
5129 
5130 static const struct got_error *
5131 show_diff_view(struct tog_view *view)
5132 {
5133 	const struct got_error *err;
5134 	struct tog_diff_view_state *s = &view->state.diff;
5135 	char *id_str1 = NULL, *id_str2, *header;
5136 	const char *label1, *label2;
5137 
5138 	if (s->id1) {
5139 		err = got_object_id_str(&id_str1, s->id1);
5140 		if (err)
5141 			return err;
5142 		label1 = s->label1 ? s->label1 : id_str1;
5143 	} else
5144 		label1 = "/dev/null";
5145 
5146 	err = got_object_id_str(&id_str2, s->id2);
5147 	if (err)
5148 		return err;
5149 	label2 = s->label2 ? s->label2 : id_str2;
5150 
5151 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5152 		err = got_error_from_errno("asprintf");
5153 		free(id_str1);
5154 		free(id_str2);
5155 		return err;
5156 	}
5157 	free(id_str1);
5158 	free(id_str2);
5159 
5160 	err = draw_file(view, header);
5161 	free(header);
5162 	return err;
5163 }
5164 
5165 static const struct got_error *
5166 set_selected_commit(struct tog_diff_view_state *s,
5167     struct commit_queue_entry *entry)
5168 {
5169 	const struct got_error *err;
5170 	const struct got_object_id_queue *parent_ids;
5171 	struct got_commit_object *selected_commit;
5172 	struct got_object_qid *pid;
5173 
5174 	free(s->id2);
5175 	s->id2 = got_object_id_dup(entry->id);
5176 	if (s->id2 == NULL)
5177 		return got_error_from_errno("got_object_id_dup");
5178 
5179 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5180 	if (err)
5181 		return err;
5182 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5183 	free(s->id1);
5184 	pid = STAILQ_FIRST(parent_ids);
5185 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5186 	got_object_commit_close(selected_commit);
5187 	return NULL;
5188 }
5189 
5190 static const struct got_error *
5191 reset_diff_view(struct tog_view *view)
5192 {
5193 	struct tog_diff_view_state *s = &view->state.diff;
5194 
5195 	view->count = 0;
5196 	wclear(view->window);
5197 	s->first_displayed_line = 1;
5198 	s->last_displayed_line = view->nlines;
5199 	s->matched_line = 0;
5200 	diff_view_indicate_progress(view);
5201 	return create_diff(s);
5202 }
5203 
5204 static void
5205 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5206 {
5207 	int start, i;
5208 
5209 	i = start = s->first_displayed_line - 1;
5210 
5211 	while (s->lines[i].type != type) {
5212 		if (i == 0)
5213 			i = s->nlines - 1;
5214 		if (--i == start)
5215 			return; /* do nothing, requested type not in file */
5216 	}
5217 
5218 	s->selected_line = 1;
5219 	s->first_displayed_line = i;
5220 }
5221 
5222 static void
5223 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5224 {
5225 	int start, i;
5226 
5227 	i = start = s->first_displayed_line + 1;
5228 
5229 	while (s->lines[i].type != type) {
5230 		if (i == s->nlines - 1)
5231 			i = 0;
5232 		if (++i == start)
5233 			return; /* do nothing, requested type not in file */
5234 	}
5235 
5236 	s->selected_line = 1;
5237 	s->first_displayed_line = i;
5238 }
5239 
5240 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5241     int, int, int);
5242 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5243     int, int);
5244 
5245 static const struct got_error *
5246 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5247 {
5248 	const struct got_error *err = NULL;
5249 	struct tog_diff_view_state *s = &view->state.diff;
5250 	struct tog_log_view_state *ls;
5251 	struct commit_queue_entry *old_selected_entry;
5252 	char *line = NULL;
5253 	size_t linesize = 0;
5254 	ssize_t linelen;
5255 	int i, nscroll = view->nlines - 1, up = 0;
5256 
5257 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5258 
5259 	switch (ch) {
5260 	case '0':
5261 		view->x = 0;
5262 		break;
5263 	case '$':
5264 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5265 		view->count = 0;
5266 		break;
5267 	case KEY_RIGHT:
5268 	case 'l':
5269 		if (view->x + view->ncols / 3 < view->maxx)
5270 			view->x += 2;  /* move two columns right */
5271 		else
5272 			view->count = 0;
5273 		break;
5274 	case KEY_LEFT:
5275 	case 'h':
5276 		view->x -= MIN(view->x, 2);  /* move two columns back */
5277 		if (view->x <= 0)
5278 			view->count = 0;
5279 		break;
5280 	case 'a':
5281 	case 'w':
5282 		if (ch == 'a')
5283 			s->force_text_diff = !s->force_text_diff;
5284 		else if (ch == 'w')
5285 			s->ignore_whitespace = !s->ignore_whitespace;
5286 		err = reset_diff_view(view);
5287 		break;
5288 	case 'g':
5289 	case KEY_HOME:
5290 		s->first_displayed_line = 1;
5291 		view->count = 0;
5292 		break;
5293 	case 'G':
5294 	case KEY_END:
5295 		view->count = 0;
5296 		if (s->eof)
5297 			break;
5298 
5299 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5300 		s->eof = 1;
5301 		break;
5302 	case 'k':
5303 	case KEY_UP:
5304 	case CTRL('p'):
5305 		if (s->first_displayed_line > 1)
5306 			s->first_displayed_line--;
5307 		else
5308 			view->count = 0;
5309 		break;
5310 	case CTRL('u'):
5311 	case 'u':
5312 		nscroll /= 2;
5313 		/* FALL THROUGH */
5314 	case KEY_PPAGE:
5315 	case CTRL('b'):
5316 	case 'b':
5317 		if (s->first_displayed_line == 1) {
5318 			view->count = 0;
5319 			break;
5320 		}
5321 		i = 0;
5322 		while (i++ < nscroll && s->first_displayed_line > 1)
5323 			s->first_displayed_line--;
5324 		break;
5325 	case 'j':
5326 	case KEY_DOWN:
5327 	case CTRL('n'):
5328 		if (!s->eof)
5329 			s->first_displayed_line++;
5330 		else
5331 			view->count = 0;
5332 		break;
5333 	case CTRL('d'):
5334 	case 'd':
5335 		nscroll /= 2;
5336 		/* FALL THROUGH */
5337 	case KEY_NPAGE:
5338 	case CTRL('f'):
5339 	case 'f':
5340 	case ' ':
5341 		if (s->eof) {
5342 			view->count = 0;
5343 			break;
5344 		}
5345 		i = 0;
5346 		while (!s->eof && i++ < nscroll) {
5347 			linelen = getline(&line, &linesize, s->f);
5348 			s->first_displayed_line++;
5349 			if (linelen == -1) {
5350 				if (feof(s->f)) {
5351 					s->eof = 1;
5352 				} else
5353 					err = got_ferror(s->f, GOT_ERR_IO);
5354 				break;
5355 			}
5356 		}
5357 		free(line);
5358 		break;
5359 	case '(':
5360 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5361 		break;
5362 	case ')':
5363 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5364 		break;
5365 	case '{':
5366 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5367 		break;
5368 	case '}':
5369 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5370 		break;
5371 	case '[':
5372 		if (s->diff_context > 0) {
5373 			s->diff_context--;
5374 			s->matched_line = 0;
5375 			diff_view_indicate_progress(view);
5376 			err = create_diff(s);
5377 			if (s->first_displayed_line + view->nlines - 1 >
5378 			    s->nlines) {
5379 				s->first_displayed_line = 1;
5380 				s->last_displayed_line = view->nlines;
5381 			}
5382 		} else
5383 			view->count = 0;
5384 		break;
5385 	case ']':
5386 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5387 			s->diff_context++;
5388 			s->matched_line = 0;
5389 			diff_view_indicate_progress(view);
5390 			err = create_diff(s);
5391 		} else
5392 			view->count = 0;
5393 		break;
5394 	case '<':
5395 	case ',':
5396 	case 'K':
5397 		up = 1;
5398 		/* FALL THROUGH */
5399 	case '>':
5400 	case '.':
5401 	case 'J':
5402 		if (s->parent_view == NULL) {
5403 			view->count = 0;
5404 			break;
5405 		}
5406 		s->parent_view->count = view->count;
5407 
5408 		if (s->parent_view->type == TOG_VIEW_LOG) {
5409 			ls = &s->parent_view->state.log;
5410 			old_selected_entry = ls->selected_entry;
5411 
5412 			err = input_log_view(NULL, s->parent_view,
5413 			    up ? KEY_UP : KEY_DOWN);
5414 			if (err)
5415 				break;
5416 			view->count = s->parent_view->count;
5417 
5418 			if (old_selected_entry == ls->selected_entry)
5419 				break;
5420 
5421 			err = set_selected_commit(s, ls->selected_entry);
5422 			if (err)
5423 				break;
5424 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5425 			struct tog_blame_view_state *bs;
5426 			struct got_object_id *id, *prev_id;
5427 
5428 			bs = &s->parent_view->state.blame;
5429 			prev_id = get_annotation_for_line(bs->blame.lines,
5430 			    bs->blame.nlines, bs->last_diffed_line);
5431 
5432 			err = input_blame_view(&view, s->parent_view,
5433 			    up ? KEY_UP : KEY_DOWN);
5434 			if (err)
5435 				break;
5436 			view->count = s->parent_view->count;
5437 
5438 			if (prev_id == NULL)
5439 				break;
5440 			id = get_selected_commit_id(bs->blame.lines,
5441 			    bs->blame.nlines, bs->first_displayed_line,
5442 			    bs->selected_line);
5443 			if (id == NULL)
5444 				break;
5445 
5446 			if (!got_object_id_cmp(prev_id, id))
5447 				break;
5448 
5449 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5450 			if (err)
5451 				break;
5452 		}
5453 		s->first_displayed_line = 1;
5454 		s->last_displayed_line = view->nlines;
5455 		s->matched_line = 0;
5456 		view->x = 0;
5457 
5458 		diff_view_indicate_progress(view);
5459 		err = create_diff(s);
5460 		break;
5461 	default:
5462 		view->count = 0;
5463 		break;
5464 	}
5465 
5466 	return err;
5467 }
5468 
5469 static const struct got_error *
5470 cmd_diff(int argc, char *argv[])
5471 {
5472 	const struct got_error *error = NULL;
5473 	struct got_repository *repo = NULL;
5474 	struct got_worktree *worktree = NULL;
5475 	struct got_object_id *id1 = NULL, *id2 = NULL;
5476 	char *repo_path = NULL, *cwd = NULL;
5477 	char *id_str1 = NULL, *id_str2 = NULL;
5478 	char *label1 = NULL, *label2 = NULL;
5479 	int diff_context = 3, ignore_whitespace = 0;
5480 	int ch, force_text_diff = 0;
5481 	const char *errstr;
5482 	struct tog_view *view;
5483 	int *pack_fds = NULL;
5484 
5485 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5486 		switch (ch) {
5487 		case 'a':
5488 			force_text_diff = 1;
5489 			break;
5490 		case 'C':
5491 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5492 			    &errstr);
5493 			if (errstr != NULL)
5494 				errx(1, "number of context lines is %s: %s",
5495 				    errstr, errstr);
5496 			break;
5497 		case 'r':
5498 			repo_path = realpath(optarg, NULL);
5499 			if (repo_path == NULL)
5500 				return got_error_from_errno2("realpath",
5501 				    optarg);
5502 			got_path_strip_trailing_slashes(repo_path);
5503 			break;
5504 		case 'w':
5505 			ignore_whitespace = 1;
5506 			break;
5507 		default:
5508 			usage_diff();
5509 			/* NOTREACHED */
5510 		}
5511 	}
5512 
5513 	argc -= optind;
5514 	argv += optind;
5515 
5516 	if (argc == 0) {
5517 		usage_diff(); /* TODO show local worktree changes */
5518 	} else if (argc == 2) {
5519 		id_str1 = argv[0];
5520 		id_str2 = argv[1];
5521 	} else
5522 		usage_diff();
5523 
5524 	error = got_repo_pack_fds_open(&pack_fds);
5525 	if (error)
5526 		goto done;
5527 
5528 	if (repo_path == NULL) {
5529 		cwd = getcwd(NULL, 0);
5530 		if (cwd == NULL)
5531 			return got_error_from_errno("getcwd");
5532 		error = got_worktree_open(&worktree, cwd);
5533 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5534 			goto done;
5535 		if (worktree)
5536 			repo_path =
5537 			    strdup(got_worktree_get_repo_path(worktree));
5538 		else
5539 			repo_path = strdup(cwd);
5540 		if (repo_path == NULL) {
5541 			error = got_error_from_errno("strdup");
5542 			goto done;
5543 		}
5544 	}
5545 
5546 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5547 	if (error)
5548 		goto done;
5549 
5550 	init_curses();
5551 
5552 	error = apply_unveil(got_repo_get_path(repo), NULL);
5553 	if (error)
5554 		goto done;
5555 
5556 	error = tog_load_refs(repo, 0);
5557 	if (error)
5558 		goto done;
5559 
5560 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5561 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5562 	if (error)
5563 		goto done;
5564 
5565 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5566 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5567 	if (error)
5568 		goto done;
5569 
5570 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5571 	if (view == NULL) {
5572 		error = got_error_from_errno("view_open");
5573 		goto done;
5574 	}
5575 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5576 	    ignore_whitespace, force_text_diff, NULL,  repo);
5577 	if (error)
5578 		goto done;
5579 	error = view_loop(view);
5580 done:
5581 	free(label1);
5582 	free(label2);
5583 	free(repo_path);
5584 	free(cwd);
5585 	if (repo) {
5586 		const struct got_error *close_err = got_repo_close(repo);
5587 		if (error == NULL)
5588 			error = close_err;
5589 	}
5590 	if (worktree)
5591 		got_worktree_close(worktree);
5592 	if (pack_fds) {
5593 		const struct got_error *pack_err =
5594 		    got_repo_pack_fds_close(pack_fds);
5595 		if (error == NULL)
5596 			error = pack_err;
5597 	}
5598 	tog_free_refs();
5599 	return error;
5600 }
5601 
5602 __dead static void
5603 usage_blame(void)
5604 {
5605 	endwin();
5606 	fprintf(stderr,
5607 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5608 	    getprogname());
5609 	exit(1);
5610 }
5611 
5612 struct tog_blame_line {
5613 	int annotated;
5614 	struct got_object_id *id;
5615 };
5616 
5617 static const struct got_error *
5618 draw_blame(struct tog_view *view)
5619 {
5620 	struct tog_blame_view_state *s = &view->state.blame;
5621 	struct tog_blame *blame = &s->blame;
5622 	regmatch_t *regmatch = &view->regmatch;
5623 	const struct got_error *err;
5624 	int lineno = 0, nprinted = 0;
5625 	char *line = NULL;
5626 	size_t linesize = 0;
5627 	ssize_t linelen;
5628 	wchar_t *wline;
5629 	int width;
5630 	struct tog_blame_line *blame_line;
5631 	struct got_object_id *prev_id = NULL;
5632 	char *id_str;
5633 	struct tog_color *tc;
5634 
5635 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5636 	if (err)
5637 		return err;
5638 
5639 	rewind(blame->f);
5640 	werase(view->window);
5641 
5642 	if (asprintf(&line, "commit %s", id_str) == -1) {
5643 		err = got_error_from_errno("asprintf");
5644 		free(id_str);
5645 		return err;
5646 	}
5647 
5648 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5649 	free(line);
5650 	line = NULL;
5651 	if (err)
5652 		return err;
5653 	if (view_needs_focus_indication(view))
5654 		wstandout(view->window);
5655 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5656 	if (tc)
5657 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5658 	waddwstr(view->window, wline);
5659 	while (width++ < view->ncols)
5660 		waddch(view->window, ' ');
5661 	if (tc)
5662 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5663 	if (view_needs_focus_indication(view))
5664 		wstandend(view->window);
5665 	free(wline);
5666 	wline = NULL;
5667 
5668 	if (view->gline > blame->nlines)
5669 		view->gline = blame->nlines;
5670 
5671 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5672 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5673 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5674 		free(id_str);
5675 		return got_error_from_errno("asprintf");
5676 	}
5677 	free(id_str);
5678 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5679 	free(line);
5680 	line = NULL;
5681 	if (err)
5682 		return err;
5683 	waddwstr(view->window, wline);
5684 	free(wline);
5685 	wline = NULL;
5686 	if (width < view->ncols - 1)
5687 		waddch(view->window, '\n');
5688 
5689 	s->eof = 0;
5690 	view->maxx = 0;
5691 	while (nprinted < view->nlines - 2) {
5692 		linelen = getline(&line, &linesize, blame->f);
5693 		if (linelen == -1) {
5694 			if (feof(blame->f)) {
5695 				s->eof = 1;
5696 				break;
5697 			}
5698 			free(line);
5699 			return got_ferror(blame->f, GOT_ERR_IO);
5700 		}
5701 		if (++lineno < s->first_displayed_line)
5702 			continue;
5703 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5704 			continue;
5705 
5706 		/* Set view->maxx based on full line length. */
5707 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5708 		if (err) {
5709 			free(line);
5710 			return err;
5711 		}
5712 		free(wline);
5713 		wline = NULL;
5714 		view->maxx = MAX(view->maxx, width);
5715 
5716 		if (nprinted == s->selected_line - 1)
5717 			wstandout(view->window);
5718 
5719 		if (blame->nlines > 0) {
5720 			blame_line = &blame->lines[lineno - 1];
5721 			if (blame_line->annotated && prev_id &&
5722 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5723 			    !(nprinted == s->selected_line - 1)) {
5724 				waddstr(view->window, "        ");
5725 			} else if (blame_line->annotated) {
5726 				char *id_str;
5727 				err = got_object_id_str(&id_str,
5728 				    blame_line->id);
5729 				if (err) {
5730 					free(line);
5731 					return err;
5732 				}
5733 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5734 				if (tc)
5735 					wattr_on(view->window,
5736 					    COLOR_PAIR(tc->colorpair), NULL);
5737 				wprintw(view->window, "%.8s", id_str);
5738 				if (tc)
5739 					wattr_off(view->window,
5740 					    COLOR_PAIR(tc->colorpair), NULL);
5741 				free(id_str);
5742 				prev_id = blame_line->id;
5743 			} else {
5744 				waddstr(view->window, "........");
5745 				prev_id = NULL;
5746 			}
5747 		} else {
5748 			waddstr(view->window, "........");
5749 			prev_id = NULL;
5750 		}
5751 
5752 		if (nprinted == s->selected_line - 1)
5753 			wstandend(view->window);
5754 		waddstr(view->window, " ");
5755 
5756 		if (view->ncols <= 9) {
5757 			width = 9;
5758 		} else if (s->first_displayed_line + nprinted ==
5759 		    s->matched_line &&
5760 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5761 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5762 			    view->window, view->x, regmatch);
5763 			if (err) {
5764 				free(line);
5765 				return err;
5766 			}
5767 			width += 9;
5768 		} else {
5769 			int skip;
5770 			err = format_line(&wline, &width, &skip, line,
5771 			    view->x, view->ncols - 9, 9, 1);
5772 			if (err) {
5773 				free(line);
5774 				return err;
5775 			}
5776 			waddwstr(view->window, &wline[skip]);
5777 			width += 9;
5778 			free(wline);
5779 			wline = NULL;
5780 		}
5781 
5782 		if (width <= view->ncols - 1)
5783 			waddch(view->window, '\n');
5784 		if (++nprinted == 1)
5785 			s->first_displayed_line = lineno;
5786 	}
5787 	free(line);
5788 	s->last_displayed_line = lineno;
5789 
5790 	view_border(view);
5791 
5792 	return NULL;
5793 }
5794 
5795 static const struct got_error *
5796 blame_cb(void *arg, int nlines, int lineno,
5797     struct got_commit_object *commit, struct got_object_id *id)
5798 {
5799 	const struct got_error *err = NULL;
5800 	struct tog_blame_cb_args *a = arg;
5801 	struct tog_blame_line *line;
5802 	int errcode;
5803 
5804 	if (nlines != a->nlines ||
5805 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5806 		return got_error(GOT_ERR_RANGE);
5807 
5808 	errcode = pthread_mutex_lock(&tog_mutex);
5809 	if (errcode)
5810 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5811 
5812 	if (*a->quit) {	/* user has quit the blame view */
5813 		err = got_error(GOT_ERR_ITER_COMPLETED);
5814 		goto done;
5815 	}
5816 
5817 	if (lineno == -1)
5818 		goto done; /* no change in this commit */
5819 
5820 	line = &a->lines[lineno - 1];
5821 	if (line->annotated)
5822 		goto done;
5823 
5824 	line->id = got_object_id_dup(id);
5825 	if (line->id == NULL) {
5826 		err = got_error_from_errno("got_object_id_dup");
5827 		goto done;
5828 	}
5829 	line->annotated = 1;
5830 done:
5831 	errcode = pthread_mutex_unlock(&tog_mutex);
5832 	if (errcode)
5833 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5834 	return err;
5835 }
5836 
5837 static void *
5838 blame_thread(void *arg)
5839 {
5840 	const struct got_error *err, *close_err;
5841 	struct tog_blame_thread_args *ta = arg;
5842 	struct tog_blame_cb_args *a = ta->cb_args;
5843 	int errcode, fd1 = -1, fd2 = -1;
5844 	FILE *f1 = NULL, *f2 = NULL;
5845 
5846 	fd1 = got_opentempfd();
5847 	if (fd1 == -1)
5848 		return (void *)got_error_from_errno("got_opentempfd");
5849 
5850 	fd2 = got_opentempfd();
5851 	if (fd2 == -1) {
5852 		err = got_error_from_errno("got_opentempfd");
5853 		goto done;
5854 	}
5855 
5856 	f1 = got_opentemp();
5857 	if (f1 == NULL) {
5858 		err = (void *)got_error_from_errno("got_opentemp");
5859 		goto done;
5860 	}
5861 	f2 = got_opentemp();
5862 	if (f2 == NULL) {
5863 		err = (void *)got_error_from_errno("got_opentemp");
5864 		goto done;
5865 	}
5866 
5867 	err = block_signals_used_by_main_thread();
5868 	if (err)
5869 		goto done;
5870 
5871 	err = got_blame(ta->path, a->commit_id, ta->repo,
5872 	    tog_diff_algo, blame_cb, ta->cb_args,
5873 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5874 	if (err && err->code == GOT_ERR_CANCELLED)
5875 		err = NULL;
5876 
5877 	errcode = pthread_mutex_lock(&tog_mutex);
5878 	if (errcode) {
5879 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5880 		goto done;
5881 	}
5882 
5883 	close_err = got_repo_close(ta->repo);
5884 	if (err == NULL)
5885 		err = close_err;
5886 	ta->repo = NULL;
5887 	*ta->complete = 1;
5888 
5889 	errcode = pthread_mutex_unlock(&tog_mutex);
5890 	if (errcode && err == NULL)
5891 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5892 
5893 done:
5894 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5895 		err = got_error_from_errno("close");
5896 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5897 		err = got_error_from_errno("close");
5898 	if (f1 && fclose(f1) == EOF && err == NULL)
5899 		err = got_error_from_errno("fclose");
5900 	if (f2 && fclose(f2) == EOF && err == NULL)
5901 		err = got_error_from_errno("fclose");
5902 
5903 	return (void *)err;
5904 }
5905 
5906 static struct got_object_id *
5907 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5908     int first_displayed_line, int selected_line)
5909 {
5910 	struct tog_blame_line *line;
5911 
5912 	if (nlines <= 0)
5913 		return NULL;
5914 
5915 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5916 	if (!line->annotated)
5917 		return NULL;
5918 
5919 	return line->id;
5920 }
5921 
5922 static struct got_object_id *
5923 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5924     int lineno)
5925 {
5926 	struct tog_blame_line *line;
5927 
5928 	if (nlines <= 0 || lineno >= nlines)
5929 		return NULL;
5930 
5931 	line = &lines[lineno - 1];
5932 	if (!line->annotated)
5933 		return NULL;
5934 
5935 	return line->id;
5936 }
5937 
5938 static const struct got_error *
5939 stop_blame(struct tog_blame *blame)
5940 {
5941 	const struct got_error *err = NULL;
5942 	int i;
5943 
5944 	if (blame->thread) {
5945 		int errcode;
5946 		errcode = pthread_mutex_unlock(&tog_mutex);
5947 		if (errcode)
5948 			return got_error_set_errno(errcode,
5949 			    "pthread_mutex_unlock");
5950 		errcode = pthread_join(blame->thread, (void **)&err);
5951 		if (errcode)
5952 			return got_error_set_errno(errcode, "pthread_join");
5953 		errcode = pthread_mutex_lock(&tog_mutex);
5954 		if (errcode)
5955 			return got_error_set_errno(errcode,
5956 			    "pthread_mutex_lock");
5957 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5958 			err = NULL;
5959 		blame->thread = 0; //NULL;
5960 	}
5961 	if (blame->thread_args.repo) {
5962 		const struct got_error *close_err;
5963 		close_err = got_repo_close(blame->thread_args.repo);
5964 		if (err == NULL)
5965 			err = close_err;
5966 		blame->thread_args.repo = NULL;
5967 	}
5968 	if (blame->f) {
5969 		if (fclose(blame->f) == EOF && err == NULL)
5970 			err = got_error_from_errno("fclose");
5971 		blame->f = NULL;
5972 	}
5973 	if (blame->lines) {
5974 		for (i = 0; i < blame->nlines; i++)
5975 			free(blame->lines[i].id);
5976 		free(blame->lines);
5977 		blame->lines = NULL;
5978 	}
5979 	free(blame->cb_args.commit_id);
5980 	blame->cb_args.commit_id = NULL;
5981 	if (blame->pack_fds) {
5982 		const struct got_error *pack_err =
5983 		    got_repo_pack_fds_close(blame->pack_fds);
5984 		if (err == NULL)
5985 			err = pack_err;
5986 		blame->pack_fds = NULL;
5987 	}
5988 	return err;
5989 }
5990 
5991 static const struct got_error *
5992 cancel_blame_view(void *arg)
5993 {
5994 	const struct got_error *err = NULL;
5995 	int *done = arg;
5996 	int errcode;
5997 
5998 	errcode = pthread_mutex_lock(&tog_mutex);
5999 	if (errcode)
6000 		return got_error_set_errno(errcode,
6001 		    "pthread_mutex_unlock");
6002 
6003 	if (*done)
6004 		err = got_error(GOT_ERR_CANCELLED);
6005 
6006 	errcode = pthread_mutex_unlock(&tog_mutex);
6007 	if (errcode)
6008 		return got_error_set_errno(errcode,
6009 		    "pthread_mutex_lock");
6010 
6011 	return err;
6012 }
6013 
6014 static const struct got_error *
6015 run_blame(struct tog_view *view)
6016 {
6017 	struct tog_blame_view_state *s = &view->state.blame;
6018 	struct tog_blame *blame = &s->blame;
6019 	const struct got_error *err = NULL;
6020 	struct got_commit_object *commit = NULL;
6021 	struct got_blob_object *blob = NULL;
6022 	struct got_repository *thread_repo = NULL;
6023 	struct got_object_id *obj_id = NULL;
6024 	int obj_type, fd = -1;
6025 	int *pack_fds = NULL;
6026 
6027 	err = got_object_open_as_commit(&commit, s->repo,
6028 	    &s->blamed_commit->id);
6029 	if (err)
6030 		return err;
6031 
6032 	fd = got_opentempfd();
6033 	if (fd == -1) {
6034 		err = got_error_from_errno("got_opentempfd");
6035 		goto done;
6036 	}
6037 
6038 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6039 	if (err)
6040 		goto done;
6041 
6042 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6043 	if (err)
6044 		goto done;
6045 
6046 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6047 		err = got_error(GOT_ERR_OBJ_TYPE);
6048 		goto done;
6049 	}
6050 
6051 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6052 	if (err)
6053 		goto done;
6054 	blame->f = got_opentemp();
6055 	if (blame->f == NULL) {
6056 		err = got_error_from_errno("got_opentemp");
6057 		goto done;
6058 	}
6059 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6060 	    &blame->line_offsets, blame->f, blob);
6061 	if (err)
6062 		goto done;
6063 	if (blame->nlines == 0) {
6064 		s->blame_complete = 1;
6065 		goto done;
6066 	}
6067 
6068 	/* Don't include \n at EOF in the blame line count. */
6069 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6070 		blame->nlines--;
6071 
6072 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6073 	if (blame->lines == NULL) {
6074 		err = got_error_from_errno("calloc");
6075 		goto done;
6076 	}
6077 
6078 	err = got_repo_pack_fds_open(&pack_fds);
6079 	if (err)
6080 		goto done;
6081 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6082 	    pack_fds);
6083 	if (err)
6084 		goto done;
6085 
6086 	blame->pack_fds = pack_fds;
6087 	blame->cb_args.view = view;
6088 	blame->cb_args.lines = blame->lines;
6089 	blame->cb_args.nlines = blame->nlines;
6090 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6091 	if (blame->cb_args.commit_id == NULL) {
6092 		err = got_error_from_errno("got_object_id_dup");
6093 		goto done;
6094 	}
6095 	blame->cb_args.quit = &s->done;
6096 
6097 	blame->thread_args.path = s->path;
6098 	blame->thread_args.repo = thread_repo;
6099 	blame->thread_args.cb_args = &blame->cb_args;
6100 	blame->thread_args.complete = &s->blame_complete;
6101 	blame->thread_args.cancel_cb = cancel_blame_view;
6102 	blame->thread_args.cancel_arg = &s->done;
6103 	s->blame_complete = 0;
6104 
6105 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6106 		s->first_displayed_line = 1;
6107 		s->last_displayed_line = view->nlines;
6108 		s->selected_line = 1;
6109 	}
6110 	s->matched_line = 0;
6111 
6112 done:
6113 	if (commit)
6114 		got_object_commit_close(commit);
6115 	if (fd != -1 && close(fd) == -1 && err == NULL)
6116 		err = got_error_from_errno("close");
6117 	if (blob)
6118 		got_object_blob_close(blob);
6119 	free(obj_id);
6120 	if (err)
6121 		stop_blame(blame);
6122 	return err;
6123 }
6124 
6125 static const struct got_error *
6126 open_blame_view(struct tog_view *view, char *path,
6127     struct got_object_id *commit_id, struct got_repository *repo)
6128 {
6129 	const struct got_error *err = NULL;
6130 	struct tog_blame_view_state *s = &view->state.blame;
6131 
6132 	STAILQ_INIT(&s->blamed_commits);
6133 
6134 	s->path = strdup(path);
6135 	if (s->path == NULL)
6136 		return got_error_from_errno("strdup");
6137 
6138 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6139 	if (err) {
6140 		free(s->path);
6141 		return err;
6142 	}
6143 
6144 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6145 	s->first_displayed_line = 1;
6146 	s->last_displayed_line = view->nlines;
6147 	s->selected_line = 1;
6148 	s->blame_complete = 0;
6149 	s->repo = repo;
6150 	s->commit_id = commit_id;
6151 	memset(&s->blame, 0, sizeof(s->blame));
6152 
6153 	STAILQ_INIT(&s->colors);
6154 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6155 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6156 		    get_color_value("TOG_COLOR_COMMIT"));
6157 		if (err)
6158 			return err;
6159 	}
6160 
6161 	view->show = show_blame_view;
6162 	view->input = input_blame_view;
6163 	view->reset = reset_blame_view;
6164 	view->close = close_blame_view;
6165 	view->search_start = search_start_blame_view;
6166 	view->search_setup = search_setup_blame_view;
6167 	view->search_next = search_next_view_match;
6168 
6169 	return run_blame(view);
6170 }
6171 
6172 static const struct got_error *
6173 close_blame_view(struct tog_view *view)
6174 {
6175 	const struct got_error *err = NULL;
6176 	struct tog_blame_view_state *s = &view->state.blame;
6177 
6178 	if (s->blame.thread)
6179 		err = stop_blame(&s->blame);
6180 
6181 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6182 		struct got_object_qid *blamed_commit;
6183 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6184 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6185 		got_object_qid_free(blamed_commit);
6186 	}
6187 
6188 	free(s->path);
6189 	free_colors(&s->colors);
6190 	return err;
6191 }
6192 
6193 static const struct got_error *
6194 search_start_blame_view(struct tog_view *view)
6195 {
6196 	struct tog_blame_view_state *s = &view->state.blame;
6197 
6198 	s->matched_line = 0;
6199 	return NULL;
6200 }
6201 
6202 static void
6203 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6204     size_t *nlines, int **first, int **last, int **match, int **selected)
6205 {
6206 	struct tog_blame_view_state *s = &view->state.blame;
6207 
6208 	*f = s->blame.f;
6209 	*nlines = s->blame.nlines;
6210 	*line_offsets = s->blame.line_offsets;
6211 	*match = &s->matched_line;
6212 	*first = &s->first_displayed_line;
6213 	*last = &s->last_displayed_line;
6214 	*selected = &s->selected_line;
6215 }
6216 
6217 static const struct got_error *
6218 show_blame_view(struct tog_view *view)
6219 {
6220 	const struct got_error *err = NULL;
6221 	struct tog_blame_view_state *s = &view->state.blame;
6222 	int errcode;
6223 
6224 	if (s->blame.thread == 0 && !s->blame_complete) {
6225 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6226 		    &s->blame.thread_args);
6227 		if (errcode)
6228 			return got_error_set_errno(errcode, "pthread_create");
6229 
6230 		halfdelay(1); /* fast refresh while annotating  */
6231 	}
6232 
6233 	if (s->blame_complete)
6234 		halfdelay(10); /* disable fast refresh */
6235 
6236 	err = draw_blame(view);
6237 
6238 	view_border(view);
6239 	return err;
6240 }
6241 
6242 static const struct got_error *
6243 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6244     struct got_repository *repo, struct got_object_id *id)
6245 {
6246 	struct tog_view		*log_view;
6247 	const struct got_error	*err = NULL;
6248 
6249 	*new_view = NULL;
6250 
6251 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6252 	if (log_view == NULL)
6253 		return got_error_from_errno("view_open");
6254 
6255 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6256 	if (err)
6257 		view_close(log_view);
6258 	else
6259 		*new_view = log_view;
6260 
6261 	return err;
6262 }
6263 
6264 static const struct got_error *
6265 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6266 {
6267 	const struct got_error *err = NULL, *thread_err = NULL;
6268 	struct tog_view *diff_view;
6269 	struct tog_blame_view_state *s = &view->state.blame;
6270 	int eos, nscroll, begin_y = 0, begin_x = 0;
6271 
6272 	eos = nscroll = view->nlines - 2;
6273 	if (view_is_hsplit_top(view))
6274 		--eos;  /* border */
6275 
6276 	switch (ch) {
6277 	case '0':
6278 		view->x = 0;
6279 		break;
6280 	case '$':
6281 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6282 		view->count = 0;
6283 		break;
6284 	case KEY_RIGHT:
6285 	case 'l':
6286 		if (view->x + view->ncols / 3 < view->maxx)
6287 			view->x += 2;  /* move two columns right */
6288 		else
6289 			view->count = 0;
6290 		break;
6291 	case KEY_LEFT:
6292 	case 'h':
6293 		view->x -= MIN(view->x, 2);  /* move two columns back */
6294 		if (view->x <= 0)
6295 			view->count = 0;
6296 		break;
6297 	case 'q':
6298 		s->done = 1;
6299 		break;
6300 	case 'g':
6301 	case KEY_HOME:
6302 		s->selected_line = 1;
6303 		s->first_displayed_line = 1;
6304 		view->count = 0;
6305 		break;
6306 	case 'G':
6307 	case KEY_END:
6308 		if (s->blame.nlines < eos) {
6309 			s->selected_line = s->blame.nlines;
6310 			s->first_displayed_line = 1;
6311 		} else {
6312 			s->selected_line = eos;
6313 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6314 		}
6315 		view->count = 0;
6316 		break;
6317 	case 'k':
6318 	case KEY_UP:
6319 	case CTRL('p'):
6320 		if (s->selected_line > 1)
6321 			s->selected_line--;
6322 		else if (s->selected_line == 1 &&
6323 		    s->first_displayed_line > 1)
6324 			s->first_displayed_line--;
6325 		else
6326 			view->count = 0;
6327 		break;
6328 	case CTRL('u'):
6329 	case 'u':
6330 		nscroll /= 2;
6331 		/* FALL THROUGH */
6332 	case KEY_PPAGE:
6333 	case CTRL('b'):
6334 	case 'b':
6335 		if (s->first_displayed_line == 1) {
6336 			if (view->count > 1)
6337 				nscroll += nscroll;
6338 			s->selected_line = MAX(1, s->selected_line - nscroll);
6339 			view->count = 0;
6340 			break;
6341 		}
6342 		if (s->first_displayed_line > nscroll)
6343 			s->first_displayed_line -= nscroll;
6344 		else
6345 			s->first_displayed_line = 1;
6346 		break;
6347 	case 'j':
6348 	case KEY_DOWN:
6349 	case CTRL('n'):
6350 		if (s->selected_line < eos && s->first_displayed_line +
6351 		    s->selected_line <= s->blame.nlines)
6352 			s->selected_line++;
6353 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6354 			s->first_displayed_line++;
6355 		else
6356 			view->count = 0;
6357 		break;
6358 	case 'c':
6359 	case 'p': {
6360 		struct got_object_id *id = NULL;
6361 
6362 		view->count = 0;
6363 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6364 		    s->first_displayed_line, s->selected_line);
6365 		if (id == NULL)
6366 			break;
6367 		if (ch == 'p') {
6368 			struct got_commit_object *commit, *pcommit;
6369 			struct got_object_qid *pid;
6370 			struct got_object_id *blob_id = NULL;
6371 			int obj_type;
6372 			err = got_object_open_as_commit(&commit,
6373 			    s->repo, id);
6374 			if (err)
6375 				break;
6376 			pid = STAILQ_FIRST(
6377 			    got_object_commit_get_parent_ids(commit));
6378 			if (pid == NULL) {
6379 				got_object_commit_close(commit);
6380 				break;
6381 			}
6382 			/* Check if path history ends here. */
6383 			err = got_object_open_as_commit(&pcommit,
6384 			    s->repo, &pid->id);
6385 			if (err)
6386 				break;
6387 			err = got_object_id_by_path(&blob_id, s->repo,
6388 			    pcommit, s->path);
6389 			got_object_commit_close(pcommit);
6390 			if (err) {
6391 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6392 					err = NULL;
6393 				got_object_commit_close(commit);
6394 				break;
6395 			}
6396 			err = got_object_get_type(&obj_type, s->repo,
6397 			    blob_id);
6398 			free(blob_id);
6399 			/* Can't blame non-blob type objects. */
6400 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6401 				got_object_commit_close(commit);
6402 				break;
6403 			}
6404 			err = got_object_qid_alloc(&s->blamed_commit,
6405 			    &pid->id);
6406 			got_object_commit_close(commit);
6407 		} else {
6408 			if (got_object_id_cmp(id,
6409 			    &s->blamed_commit->id) == 0)
6410 				break;
6411 			err = got_object_qid_alloc(&s->blamed_commit,
6412 			    id);
6413 		}
6414 		if (err)
6415 			break;
6416 		s->done = 1;
6417 		thread_err = stop_blame(&s->blame);
6418 		s->done = 0;
6419 		if (thread_err)
6420 			break;
6421 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6422 		    s->blamed_commit, entry);
6423 		err = run_blame(view);
6424 		if (err)
6425 			break;
6426 		break;
6427 	}
6428 	case 'C': {
6429 		struct got_object_qid *first;
6430 
6431 		view->count = 0;
6432 		first = STAILQ_FIRST(&s->blamed_commits);
6433 		if (!got_object_id_cmp(&first->id, s->commit_id))
6434 			break;
6435 		s->done = 1;
6436 		thread_err = stop_blame(&s->blame);
6437 		s->done = 0;
6438 		if (thread_err)
6439 			break;
6440 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6441 		got_object_qid_free(s->blamed_commit);
6442 		s->blamed_commit =
6443 		    STAILQ_FIRST(&s->blamed_commits);
6444 		err = run_blame(view);
6445 		if (err)
6446 			break;
6447 		break;
6448 	}
6449 	case 'L':
6450 		view->count = 0;
6451 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6452 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6453 		if (s->id_to_log)
6454 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6455 		break;
6456 	case KEY_ENTER:
6457 	case '\r': {
6458 		struct got_object_id *id = NULL;
6459 		struct got_object_qid *pid;
6460 		struct got_commit_object *commit = NULL;
6461 
6462 		view->count = 0;
6463 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6464 		    s->first_displayed_line, s->selected_line);
6465 		if (id == NULL)
6466 			break;
6467 		err = got_object_open_as_commit(&commit, s->repo, id);
6468 		if (err)
6469 			break;
6470 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6471 		if (*new_view) {
6472 			/* traversed from diff view, release diff resources  */
6473 			err = close_diff_view(*new_view);
6474 			if (err)
6475 				break;
6476 			diff_view = *new_view;
6477 		} else {
6478 			if (view_is_parent_view(view))
6479 				view_get_split(view, &begin_y, &begin_x);
6480 
6481 			diff_view = view_open(0, 0, begin_y, begin_x,
6482 			    TOG_VIEW_DIFF);
6483 			if (diff_view == NULL) {
6484 				got_object_commit_close(commit);
6485 				err = got_error_from_errno("view_open");
6486 				break;
6487 			}
6488 		}
6489 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6490 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6491 		got_object_commit_close(commit);
6492 		if (err) {
6493 			view_close(diff_view);
6494 			break;
6495 		}
6496 		s->last_diffed_line = s->first_displayed_line - 1 +
6497 		    s->selected_line;
6498 		if (*new_view)
6499 			break;	/* still open from active diff view */
6500 		if (view_is_parent_view(view) &&
6501 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6502 			err = view_init_hsplit(view, begin_y);
6503 			if (err)
6504 				break;
6505 		}
6506 
6507 		view->focussed = 0;
6508 		diff_view->focussed = 1;
6509 		diff_view->mode = view->mode;
6510 		diff_view->nlines = view->lines - begin_y;
6511 		if (view_is_parent_view(view)) {
6512 			view_transfer_size(diff_view, view);
6513 			err = view_close_child(view);
6514 			if (err)
6515 				break;
6516 			err = view_set_child(view, diff_view);
6517 			if (err)
6518 				break;
6519 			view->focus_child = 1;
6520 		} else
6521 			*new_view = diff_view;
6522 		if (err)
6523 			break;
6524 		break;
6525 	}
6526 	case CTRL('d'):
6527 	case 'd':
6528 		nscroll /= 2;
6529 		/* FALL THROUGH */
6530 	case KEY_NPAGE:
6531 	case CTRL('f'):
6532 	case 'f':
6533 	case ' ':
6534 		if (s->last_displayed_line >= s->blame.nlines &&
6535 		    s->selected_line >= MIN(s->blame.nlines,
6536 		    view->nlines - 2)) {
6537 			view->count = 0;
6538 			break;
6539 		}
6540 		if (s->last_displayed_line >= s->blame.nlines &&
6541 		    s->selected_line < view->nlines - 2) {
6542 			s->selected_line +=
6543 			    MIN(nscroll, s->last_displayed_line -
6544 			    s->first_displayed_line - s->selected_line + 1);
6545 		}
6546 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6547 			s->first_displayed_line += nscroll;
6548 		else
6549 			s->first_displayed_line =
6550 			    s->blame.nlines - (view->nlines - 3);
6551 		break;
6552 	case KEY_RESIZE:
6553 		if (s->selected_line > view->nlines - 2) {
6554 			s->selected_line = MIN(s->blame.nlines,
6555 			    view->nlines - 2);
6556 		}
6557 		break;
6558 	default:
6559 		view->count = 0;
6560 		break;
6561 	}
6562 	return thread_err ? thread_err : err;
6563 }
6564 
6565 static const struct got_error *
6566 reset_blame_view(struct tog_view *view)
6567 {
6568 	const struct got_error *err;
6569 	struct tog_blame_view_state *s = &view->state.blame;
6570 
6571 	view->count = 0;
6572 	s->done = 1;
6573 	err = stop_blame(&s->blame);
6574 	s->done = 0;
6575 	if (err)
6576 		return err;
6577 	return run_blame(view);
6578 }
6579 
6580 static const struct got_error *
6581 cmd_blame(int argc, char *argv[])
6582 {
6583 	const struct got_error *error;
6584 	struct got_repository *repo = NULL;
6585 	struct got_worktree *worktree = NULL;
6586 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6587 	char *link_target = NULL;
6588 	struct got_object_id *commit_id = NULL;
6589 	struct got_commit_object *commit = NULL;
6590 	char *commit_id_str = NULL;
6591 	int ch;
6592 	struct tog_view *view;
6593 	int *pack_fds = NULL;
6594 
6595 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6596 		switch (ch) {
6597 		case 'c':
6598 			commit_id_str = optarg;
6599 			break;
6600 		case 'r':
6601 			repo_path = realpath(optarg, NULL);
6602 			if (repo_path == NULL)
6603 				return got_error_from_errno2("realpath",
6604 				    optarg);
6605 			break;
6606 		default:
6607 			usage_blame();
6608 			/* NOTREACHED */
6609 		}
6610 	}
6611 
6612 	argc -= optind;
6613 	argv += optind;
6614 
6615 	if (argc != 1)
6616 		usage_blame();
6617 
6618 	error = got_repo_pack_fds_open(&pack_fds);
6619 	if (error != NULL)
6620 		goto done;
6621 
6622 	if (repo_path == NULL) {
6623 		cwd = getcwd(NULL, 0);
6624 		if (cwd == NULL)
6625 			return got_error_from_errno("getcwd");
6626 		error = got_worktree_open(&worktree, cwd);
6627 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6628 			goto done;
6629 		if (worktree)
6630 			repo_path =
6631 			    strdup(got_worktree_get_repo_path(worktree));
6632 		else
6633 			repo_path = strdup(cwd);
6634 		if (repo_path == NULL) {
6635 			error = got_error_from_errno("strdup");
6636 			goto done;
6637 		}
6638 	}
6639 
6640 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6641 	if (error != NULL)
6642 		goto done;
6643 
6644 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6645 	    worktree);
6646 	if (error)
6647 		goto done;
6648 
6649 	init_curses();
6650 
6651 	error = apply_unveil(got_repo_get_path(repo), NULL);
6652 	if (error)
6653 		goto done;
6654 
6655 	error = tog_load_refs(repo, 0);
6656 	if (error)
6657 		goto done;
6658 
6659 	if (commit_id_str == NULL) {
6660 		struct got_reference *head_ref;
6661 		error = got_ref_open(&head_ref, repo, worktree ?
6662 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6663 		if (error != NULL)
6664 			goto done;
6665 		error = got_ref_resolve(&commit_id, repo, head_ref);
6666 		got_ref_close(head_ref);
6667 	} else {
6668 		error = got_repo_match_object_id(&commit_id, NULL,
6669 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6670 	}
6671 	if (error != NULL)
6672 		goto done;
6673 
6674 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6675 	if (view == NULL) {
6676 		error = got_error_from_errno("view_open");
6677 		goto done;
6678 	}
6679 
6680 	error = got_object_open_as_commit(&commit, repo, commit_id);
6681 	if (error)
6682 		goto done;
6683 
6684 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6685 	    commit, repo);
6686 	if (error)
6687 		goto done;
6688 
6689 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6690 	    commit_id, repo);
6691 	if (error)
6692 		goto done;
6693 	if (worktree) {
6694 		/* Release work tree lock. */
6695 		got_worktree_close(worktree);
6696 		worktree = NULL;
6697 	}
6698 	error = view_loop(view);
6699 done:
6700 	free(repo_path);
6701 	free(in_repo_path);
6702 	free(link_target);
6703 	free(cwd);
6704 	free(commit_id);
6705 	if (commit)
6706 		got_object_commit_close(commit);
6707 	if (worktree)
6708 		got_worktree_close(worktree);
6709 	if (repo) {
6710 		const struct got_error *close_err = got_repo_close(repo);
6711 		if (error == NULL)
6712 			error = close_err;
6713 	}
6714 	if (pack_fds) {
6715 		const struct got_error *pack_err =
6716 		    got_repo_pack_fds_close(pack_fds);
6717 		if (error == NULL)
6718 			error = pack_err;
6719 	}
6720 	tog_free_refs();
6721 	return error;
6722 }
6723 
6724 static const struct got_error *
6725 draw_tree_entries(struct tog_view *view, const char *parent_path)
6726 {
6727 	struct tog_tree_view_state *s = &view->state.tree;
6728 	const struct got_error *err = NULL;
6729 	struct got_tree_entry *te;
6730 	wchar_t *wline;
6731 	char *index = NULL;
6732 	struct tog_color *tc;
6733 	int width, n, nentries, i = 1;
6734 	int limit = view->nlines;
6735 
6736 	s->ndisplayed = 0;
6737 	if (view_is_hsplit_top(view))
6738 		--limit;  /* border */
6739 
6740 	werase(view->window);
6741 
6742 	if (limit == 0)
6743 		return NULL;
6744 
6745 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6746 	    0, 0);
6747 	if (err)
6748 		return err;
6749 	if (view_needs_focus_indication(view))
6750 		wstandout(view->window);
6751 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6752 	if (tc)
6753 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6754 	waddwstr(view->window, wline);
6755 	free(wline);
6756 	wline = NULL;
6757 	while (width++ < view->ncols)
6758 		waddch(view->window, ' ');
6759 	if (tc)
6760 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6761 	if (view_needs_focus_indication(view))
6762 		wstandend(view->window);
6763 	if (--limit <= 0)
6764 		return NULL;
6765 
6766 	i += s->selected;
6767 	if (s->first_displayed_entry) {
6768 		i += got_tree_entry_get_index(s->first_displayed_entry);
6769 		if (s->tree != s->root)
6770 			++i;  /* account for ".." entry */
6771 	}
6772 	nentries = got_object_tree_get_nentries(s->tree);
6773 	if (asprintf(&index, "[%d/%d] %s",
6774 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6775 		return got_error_from_errno("asprintf");
6776 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6777 	free(index);
6778 	if (err)
6779 		return err;
6780 	waddwstr(view->window, wline);
6781 	free(wline);
6782 	wline = NULL;
6783 	if (width < view->ncols - 1)
6784 		waddch(view->window, '\n');
6785 	if (--limit <= 0)
6786 		return NULL;
6787 	waddch(view->window, '\n');
6788 	if (--limit <= 0)
6789 		return NULL;
6790 
6791 	if (s->first_displayed_entry == NULL) {
6792 		te = got_object_tree_get_first_entry(s->tree);
6793 		if (s->selected == 0) {
6794 			if (view->focussed)
6795 				wstandout(view->window);
6796 			s->selected_entry = NULL;
6797 		}
6798 		waddstr(view->window, "  ..\n");	/* parent directory */
6799 		if (s->selected == 0 && view->focussed)
6800 			wstandend(view->window);
6801 		s->ndisplayed++;
6802 		if (--limit <= 0)
6803 			return NULL;
6804 		n = 1;
6805 	} else {
6806 		n = 0;
6807 		te = s->first_displayed_entry;
6808 	}
6809 
6810 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6811 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6812 		const char *modestr = "";
6813 		mode_t mode;
6814 
6815 		te = got_object_tree_get_entry(s->tree, i);
6816 		mode = got_tree_entry_get_mode(te);
6817 
6818 		if (s->show_ids) {
6819 			err = got_object_id_str(&id_str,
6820 			    got_tree_entry_get_id(te));
6821 			if (err)
6822 				return got_error_from_errno(
6823 				    "got_object_id_str");
6824 		}
6825 		if (got_object_tree_entry_is_submodule(te))
6826 			modestr = "$";
6827 		else if (S_ISLNK(mode)) {
6828 			int i;
6829 
6830 			err = got_tree_entry_get_symlink_target(&link_target,
6831 			    te, s->repo);
6832 			if (err) {
6833 				free(id_str);
6834 				return err;
6835 			}
6836 			for (i = 0; i < strlen(link_target); i++) {
6837 				if (!isprint((unsigned char)link_target[i]))
6838 					link_target[i] = '?';
6839 			}
6840 			modestr = "@";
6841 		}
6842 		else if (S_ISDIR(mode))
6843 			modestr = "/";
6844 		else if (mode & S_IXUSR)
6845 			modestr = "*";
6846 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6847 		    got_tree_entry_get_name(te), modestr,
6848 		    link_target ? " -> ": "",
6849 		    link_target ? link_target : "") == -1) {
6850 			free(id_str);
6851 			free(link_target);
6852 			return got_error_from_errno("asprintf");
6853 		}
6854 		free(id_str);
6855 		free(link_target);
6856 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6857 		    0, 0);
6858 		if (err) {
6859 			free(line);
6860 			break;
6861 		}
6862 		if (n == s->selected) {
6863 			if (view->focussed)
6864 				wstandout(view->window);
6865 			s->selected_entry = te;
6866 		}
6867 		tc = match_color(&s->colors, line);
6868 		if (tc)
6869 			wattr_on(view->window,
6870 			    COLOR_PAIR(tc->colorpair), NULL);
6871 		waddwstr(view->window, wline);
6872 		if (tc)
6873 			wattr_off(view->window,
6874 			    COLOR_PAIR(tc->colorpair), NULL);
6875 		if (width < view->ncols - 1)
6876 			waddch(view->window, '\n');
6877 		if (n == s->selected && view->focussed)
6878 			wstandend(view->window);
6879 		free(line);
6880 		free(wline);
6881 		wline = NULL;
6882 		n++;
6883 		s->ndisplayed++;
6884 		s->last_displayed_entry = te;
6885 		if (--limit <= 0)
6886 			break;
6887 	}
6888 
6889 	return err;
6890 }
6891 
6892 static void
6893 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6894 {
6895 	struct got_tree_entry *te;
6896 	int isroot = s->tree == s->root;
6897 	int i = 0;
6898 
6899 	if (s->first_displayed_entry == NULL)
6900 		return;
6901 
6902 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6903 	while (i++ < maxscroll) {
6904 		if (te == NULL) {
6905 			if (!isroot)
6906 				s->first_displayed_entry = NULL;
6907 			break;
6908 		}
6909 		s->first_displayed_entry = te;
6910 		te = got_tree_entry_get_prev(s->tree, te);
6911 	}
6912 }
6913 
6914 static const struct got_error *
6915 tree_scroll_down(struct tog_view *view, int maxscroll)
6916 {
6917 	struct tog_tree_view_state *s = &view->state.tree;
6918 	struct got_tree_entry *next, *last;
6919 	int n = 0;
6920 
6921 	if (s->first_displayed_entry)
6922 		next = got_tree_entry_get_next(s->tree,
6923 		    s->first_displayed_entry);
6924 	else
6925 		next = got_object_tree_get_first_entry(s->tree);
6926 
6927 	last = s->last_displayed_entry;
6928 	while (next && n++ < maxscroll) {
6929 		if (last) {
6930 			s->last_displayed_entry = last;
6931 			last = got_tree_entry_get_next(s->tree, last);
6932 		}
6933 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6934 			s->first_displayed_entry = next;
6935 			next = got_tree_entry_get_next(s->tree, next);
6936 		}
6937 	}
6938 
6939 	return NULL;
6940 }
6941 
6942 static const struct got_error *
6943 tree_entry_path(char **path, struct tog_parent_trees *parents,
6944     struct got_tree_entry *te)
6945 {
6946 	const struct got_error *err = NULL;
6947 	struct tog_parent_tree *pt;
6948 	size_t len = 2; /* for leading slash and NUL */
6949 
6950 	TAILQ_FOREACH(pt, parents, entry)
6951 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6952 		    + 1 /* slash */;
6953 	if (te)
6954 		len += strlen(got_tree_entry_get_name(te));
6955 
6956 	*path = calloc(1, len);
6957 	if (path == NULL)
6958 		return got_error_from_errno("calloc");
6959 
6960 	(*path)[0] = '/';
6961 	pt = TAILQ_LAST(parents, tog_parent_trees);
6962 	while (pt) {
6963 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6964 		if (strlcat(*path, name, len) >= len) {
6965 			err = got_error(GOT_ERR_NO_SPACE);
6966 			goto done;
6967 		}
6968 		if (strlcat(*path, "/", len) >= len) {
6969 			err = got_error(GOT_ERR_NO_SPACE);
6970 			goto done;
6971 		}
6972 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6973 	}
6974 	if (te) {
6975 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6976 			err = got_error(GOT_ERR_NO_SPACE);
6977 			goto done;
6978 		}
6979 	}
6980 done:
6981 	if (err) {
6982 		free(*path);
6983 		*path = NULL;
6984 	}
6985 	return err;
6986 }
6987 
6988 static const struct got_error *
6989 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6990     struct got_tree_entry *te, struct tog_parent_trees *parents,
6991     struct got_object_id *commit_id, struct got_repository *repo)
6992 {
6993 	const struct got_error *err = NULL;
6994 	char *path;
6995 	struct tog_view *blame_view;
6996 
6997 	*new_view = NULL;
6998 
6999 	err = tree_entry_path(&path, parents, te);
7000 	if (err)
7001 		return err;
7002 
7003 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7004 	if (blame_view == NULL) {
7005 		err = got_error_from_errno("view_open");
7006 		goto done;
7007 	}
7008 
7009 	err = open_blame_view(blame_view, path, commit_id, repo);
7010 	if (err) {
7011 		if (err->code == GOT_ERR_CANCELLED)
7012 			err = NULL;
7013 		view_close(blame_view);
7014 	} else
7015 		*new_view = blame_view;
7016 done:
7017 	free(path);
7018 	return err;
7019 }
7020 
7021 static const struct got_error *
7022 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7023     struct tog_tree_view_state *s)
7024 {
7025 	struct tog_view *log_view;
7026 	const struct got_error *err = NULL;
7027 	char *path;
7028 
7029 	*new_view = NULL;
7030 
7031 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7032 	if (log_view == NULL)
7033 		return got_error_from_errno("view_open");
7034 
7035 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7036 	if (err)
7037 		return err;
7038 
7039 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7040 	    path, 0);
7041 	if (err)
7042 		view_close(log_view);
7043 	else
7044 		*new_view = log_view;
7045 	free(path);
7046 	return err;
7047 }
7048 
7049 static const struct got_error *
7050 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7051     const char *head_ref_name, struct got_repository *repo)
7052 {
7053 	const struct got_error *err = NULL;
7054 	char *commit_id_str = NULL;
7055 	struct tog_tree_view_state *s = &view->state.tree;
7056 	struct got_commit_object *commit = NULL;
7057 
7058 	TAILQ_INIT(&s->parents);
7059 	STAILQ_INIT(&s->colors);
7060 
7061 	s->commit_id = got_object_id_dup(commit_id);
7062 	if (s->commit_id == NULL)
7063 		return got_error_from_errno("got_object_id_dup");
7064 
7065 	err = got_object_open_as_commit(&commit, repo, commit_id);
7066 	if (err)
7067 		goto done;
7068 
7069 	/*
7070 	 * The root is opened here and will be closed when the view is closed.
7071 	 * Any visited subtrees and their path-wise parents are opened and
7072 	 * closed on demand.
7073 	 */
7074 	err = got_object_open_as_tree(&s->root, repo,
7075 	    got_object_commit_get_tree_id(commit));
7076 	if (err)
7077 		goto done;
7078 	s->tree = s->root;
7079 
7080 	err = got_object_id_str(&commit_id_str, commit_id);
7081 	if (err != NULL)
7082 		goto done;
7083 
7084 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7085 		err = got_error_from_errno("asprintf");
7086 		goto done;
7087 	}
7088 
7089 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7090 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7091 	if (head_ref_name) {
7092 		s->head_ref_name = strdup(head_ref_name);
7093 		if (s->head_ref_name == NULL) {
7094 			err = got_error_from_errno("strdup");
7095 			goto done;
7096 		}
7097 	}
7098 	s->repo = repo;
7099 
7100 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7101 		err = add_color(&s->colors, "\\$$",
7102 		    TOG_COLOR_TREE_SUBMODULE,
7103 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7104 		if (err)
7105 			goto done;
7106 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7107 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7108 		if (err)
7109 			goto done;
7110 		err = add_color(&s->colors, "/$",
7111 		    TOG_COLOR_TREE_DIRECTORY,
7112 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7113 		if (err)
7114 			goto done;
7115 
7116 		err = add_color(&s->colors, "\\*$",
7117 		    TOG_COLOR_TREE_EXECUTABLE,
7118 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7119 		if (err)
7120 			goto done;
7121 
7122 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7123 		    get_color_value("TOG_COLOR_COMMIT"));
7124 		if (err)
7125 			goto done;
7126 	}
7127 
7128 	view->show = show_tree_view;
7129 	view->input = input_tree_view;
7130 	view->close = close_tree_view;
7131 	view->search_start = search_start_tree_view;
7132 	view->search_next = search_next_tree_view;
7133 done:
7134 	free(commit_id_str);
7135 	if (commit)
7136 		got_object_commit_close(commit);
7137 	if (err)
7138 		close_tree_view(view);
7139 	return err;
7140 }
7141 
7142 static const struct got_error *
7143 close_tree_view(struct tog_view *view)
7144 {
7145 	struct tog_tree_view_state *s = &view->state.tree;
7146 
7147 	free_colors(&s->colors);
7148 	free(s->tree_label);
7149 	s->tree_label = NULL;
7150 	free(s->commit_id);
7151 	s->commit_id = NULL;
7152 	free(s->head_ref_name);
7153 	s->head_ref_name = NULL;
7154 	while (!TAILQ_EMPTY(&s->parents)) {
7155 		struct tog_parent_tree *parent;
7156 		parent = TAILQ_FIRST(&s->parents);
7157 		TAILQ_REMOVE(&s->parents, parent, entry);
7158 		if (parent->tree != s->root)
7159 			got_object_tree_close(parent->tree);
7160 		free(parent);
7161 
7162 	}
7163 	if (s->tree != NULL && s->tree != s->root)
7164 		got_object_tree_close(s->tree);
7165 	if (s->root)
7166 		got_object_tree_close(s->root);
7167 	return NULL;
7168 }
7169 
7170 static const struct got_error *
7171 search_start_tree_view(struct tog_view *view)
7172 {
7173 	struct tog_tree_view_state *s = &view->state.tree;
7174 
7175 	s->matched_entry = NULL;
7176 	return NULL;
7177 }
7178 
7179 static int
7180 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7181 {
7182 	regmatch_t regmatch;
7183 
7184 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7185 	    0) == 0;
7186 }
7187 
7188 static const struct got_error *
7189 search_next_tree_view(struct tog_view *view)
7190 {
7191 	struct tog_tree_view_state *s = &view->state.tree;
7192 	struct got_tree_entry *te = NULL;
7193 
7194 	if (!view->searching) {
7195 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7196 		return NULL;
7197 	}
7198 
7199 	if (s->matched_entry) {
7200 		if (view->searching == TOG_SEARCH_FORWARD) {
7201 			if (s->selected_entry)
7202 				te = got_tree_entry_get_next(s->tree,
7203 				    s->selected_entry);
7204 			else
7205 				te = got_object_tree_get_first_entry(s->tree);
7206 		} else {
7207 			if (s->selected_entry == NULL)
7208 				te = got_object_tree_get_last_entry(s->tree);
7209 			else
7210 				te = got_tree_entry_get_prev(s->tree,
7211 				    s->selected_entry);
7212 		}
7213 	} else {
7214 		if (s->selected_entry)
7215 			te = s->selected_entry;
7216 		else if (view->searching == TOG_SEARCH_FORWARD)
7217 			te = got_object_tree_get_first_entry(s->tree);
7218 		else
7219 			te = got_object_tree_get_last_entry(s->tree);
7220 	}
7221 
7222 	while (1) {
7223 		if (te == NULL) {
7224 			if (s->matched_entry == NULL) {
7225 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7226 				return NULL;
7227 			}
7228 			if (view->searching == TOG_SEARCH_FORWARD)
7229 				te = got_object_tree_get_first_entry(s->tree);
7230 			else
7231 				te = got_object_tree_get_last_entry(s->tree);
7232 		}
7233 
7234 		if (match_tree_entry(te, &view->regex)) {
7235 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7236 			s->matched_entry = te;
7237 			break;
7238 		}
7239 
7240 		if (view->searching == TOG_SEARCH_FORWARD)
7241 			te = got_tree_entry_get_next(s->tree, te);
7242 		else
7243 			te = got_tree_entry_get_prev(s->tree, te);
7244 	}
7245 
7246 	if (s->matched_entry) {
7247 		s->first_displayed_entry = s->matched_entry;
7248 		s->selected = 0;
7249 	}
7250 
7251 	return NULL;
7252 }
7253 
7254 static const struct got_error *
7255 show_tree_view(struct tog_view *view)
7256 {
7257 	const struct got_error *err = NULL;
7258 	struct tog_tree_view_state *s = &view->state.tree;
7259 	char *parent_path;
7260 
7261 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7262 	if (err)
7263 		return err;
7264 
7265 	err = draw_tree_entries(view, parent_path);
7266 	free(parent_path);
7267 
7268 	view_border(view);
7269 	return err;
7270 }
7271 
7272 static const struct got_error *
7273 tree_goto_line(struct tog_view *view, int nlines)
7274 {
7275 	const struct got_error		 *err = NULL;
7276 	struct tog_tree_view_state	 *s = &view->state.tree;
7277 	struct got_tree_entry		**fte, **lte, **ste;
7278 	int				  g, last, first = 1, i = 1;
7279 	int				  root = s->tree == s->root;
7280 	int				  off = root ? 1 : 2;
7281 
7282 	g = view->gline;
7283 	view->gline = 0;
7284 
7285 	if (g == 0)
7286 		g = 1;
7287 	else if (g > got_object_tree_get_nentries(s->tree))
7288 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7289 
7290 	fte = &s->first_displayed_entry;
7291 	lte = &s->last_displayed_entry;
7292 	ste = &s->selected_entry;
7293 
7294 	if (*fte != NULL) {
7295 		first = got_tree_entry_get_index(*fte);
7296 		first += off;  /* account for ".." */
7297 	}
7298 	last = got_tree_entry_get_index(*lte);
7299 	last += off;
7300 
7301 	if (g >= first && g <= last && g - first < nlines) {
7302 		s->selected = g - first;
7303 		return NULL;	/* gline is on the current page */
7304 	}
7305 
7306 	if (*ste != NULL) {
7307 		i = got_tree_entry_get_index(*ste);
7308 		i += off;
7309 	}
7310 
7311 	if (i < g) {
7312 		err = tree_scroll_down(view, g - i);
7313 		if (err)
7314 			return err;
7315 		if (got_tree_entry_get_index(*lte) >=
7316 		    got_object_tree_get_nentries(s->tree) - 1 &&
7317 		    first + s->selected < g &&
7318 		    s->selected < s->ndisplayed - 1) {
7319 			first = got_tree_entry_get_index(*fte);
7320 			first += off;
7321 			s->selected = g - first;
7322 		}
7323 	} else if (i > g)
7324 		tree_scroll_up(s, i - g);
7325 
7326 	if (g < nlines &&
7327 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7328 		s->selected = g - 1;
7329 
7330 	return NULL;
7331 }
7332 
7333 static const struct got_error *
7334 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7335 {
7336 	const struct got_error *err = NULL;
7337 	struct tog_tree_view_state *s = &view->state.tree;
7338 	struct got_tree_entry *te;
7339 	int n, nscroll = view->nlines - 3;
7340 
7341 	if (view->gline)
7342 		return tree_goto_line(view, nscroll);
7343 
7344 	switch (ch) {
7345 	case 'i':
7346 		s->show_ids = !s->show_ids;
7347 		view->count = 0;
7348 		break;
7349 	case 'L':
7350 		view->count = 0;
7351 		if (!s->selected_entry)
7352 			break;
7353 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7354 		break;
7355 	case 'R':
7356 		view->count = 0;
7357 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7358 		break;
7359 	case 'g':
7360 	case '=':
7361 	case KEY_HOME:
7362 		s->selected = 0;
7363 		view->count = 0;
7364 		if (s->tree == s->root)
7365 			s->first_displayed_entry =
7366 			    got_object_tree_get_first_entry(s->tree);
7367 		else
7368 			s->first_displayed_entry = NULL;
7369 		break;
7370 	case 'G':
7371 	case '*':
7372 	case KEY_END: {
7373 		int eos = view->nlines - 3;
7374 
7375 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7376 			--eos;  /* border */
7377 		s->selected = 0;
7378 		view->count = 0;
7379 		te = got_object_tree_get_last_entry(s->tree);
7380 		for (n = 0; n < eos; n++) {
7381 			if (te == NULL) {
7382 				if (s->tree != s->root) {
7383 					s->first_displayed_entry = NULL;
7384 					n++;
7385 				}
7386 				break;
7387 			}
7388 			s->first_displayed_entry = te;
7389 			te = got_tree_entry_get_prev(s->tree, te);
7390 		}
7391 		if (n > 0)
7392 			s->selected = n - 1;
7393 		break;
7394 	}
7395 	case 'k':
7396 	case KEY_UP:
7397 	case CTRL('p'):
7398 		if (s->selected > 0) {
7399 			s->selected--;
7400 			break;
7401 		}
7402 		tree_scroll_up(s, 1);
7403 		if (s->selected_entry == NULL ||
7404 		    (s->tree == s->root && s->selected_entry ==
7405 		     got_object_tree_get_first_entry(s->tree)))
7406 			view->count = 0;
7407 		break;
7408 	case CTRL('u'):
7409 	case 'u':
7410 		nscroll /= 2;
7411 		/* FALL THROUGH */
7412 	case KEY_PPAGE:
7413 	case CTRL('b'):
7414 	case 'b':
7415 		if (s->tree == s->root) {
7416 			if (got_object_tree_get_first_entry(s->tree) ==
7417 			    s->first_displayed_entry)
7418 				s->selected -= MIN(s->selected, nscroll);
7419 		} else {
7420 			if (s->first_displayed_entry == NULL)
7421 				s->selected -= MIN(s->selected, nscroll);
7422 		}
7423 		tree_scroll_up(s, MAX(0, nscroll));
7424 		if (s->selected_entry == NULL ||
7425 		    (s->tree == s->root && s->selected_entry ==
7426 		     got_object_tree_get_first_entry(s->tree)))
7427 			view->count = 0;
7428 		break;
7429 	case 'j':
7430 	case KEY_DOWN:
7431 	case CTRL('n'):
7432 		if (s->selected < s->ndisplayed - 1) {
7433 			s->selected++;
7434 			break;
7435 		}
7436 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7437 		    == NULL) {
7438 			/* can't scroll any further */
7439 			view->count = 0;
7440 			break;
7441 		}
7442 		tree_scroll_down(view, 1);
7443 		break;
7444 	case CTRL('d'):
7445 	case 'd':
7446 		nscroll /= 2;
7447 		/* FALL THROUGH */
7448 	case KEY_NPAGE:
7449 	case CTRL('f'):
7450 	case 'f':
7451 	case ' ':
7452 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7453 		    == NULL) {
7454 			/* can't scroll any further; move cursor down */
7455 			if (s->selected < s->ndisplayed - 1)
7456 				s->selected += MIN(nscroll,
7457 				    s->ndisplayed - s->selected - 1);
7458 			else
7459 				view->count = 0;
7460 			break;
7461 		}
7462 		tree_scroll_down(view, nscroll);
7463 		break;
7464 	case KEY_ENTER:
7465 	case '\r':
7466 	case KEY_BACKSPACE:
7467 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7468 			struct tog_parent_tree *parent;
7469 			/* user selected '..' */
7470 			if (s->tree == s->root) {
7471 				view->count = 0;
7472 				break;
7473 			}
7474 			parent = TAILQ_FIRST(&s->parents);
7475 			TAILQ_REMOVE(&s->parents, parent,
7476 			    entry);
7477 			got_object_tree_close(s->tree);
7478 			s->tree = parent->tree;
7479 			s->first_displayed_entry =
7480 			    parent->first_displayed_entry;
7481 			s->selected_entry =
7482 			    parent->selected_entry;
7483 			s->selected = parent->selected;
7484 			if (s->selected > view->nlines - 3) {
7485 				err = offset_selection_down(view);
7486 				if (err)
7487 					break;
7488 			}
7489 			free(parent);
7490 		} else if (S_ISDIR(got_tree_entry_get_mode(
7491 		    s->selected_entry))) {
7492 			struct got_tree_object *subtree;
7493 			view->count = 0;
7494 			err = got_object_open_as_tree(&subtree, s->repo,
7495 			    got_tree_entry_get_id(s->selected_entry));
7496 			if (err)
7497 				break;
7498 			err = tree_view_visit_subtree(s, subtree);
7499 			if (err) {
7500 				got_object_tree_close(subtree);
7501 				break;
7502 			}
7503 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7504 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7505 		break;
7506 	case KEY_RESIZE:
7507 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7508 			s->selected = view->nlines - 4;
7509 		view->count = 0;
7510 		break;
7511 	default:
7512 		view->count = 0;
7513 		break;
7514 	}
7515 
7516 	return err;
7517 }
7518 
7519 __dead static void
7520 usage_tree(void)
7521 {
7522 	endwin();
7523 	fprintf(stderr,
7524 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7525 	    getprogname());
7526 	exit(1);
7527 }
7528 
7529 static const struct got_error *
7530 cmd_tree(int argc, char *argv[])
7531 {
7532 	const struct got_error *error;
7533 	struct got_repository *repo = NULL;
7534 	struct got_worktree *worktree = NULL;
7535 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7536 	struct got_object_id *commit_id = NULL;
7537 	struct got_commit_object *commit = NULL;
7538 	const char *commit_id_arg = NULL;
7539 	char *label = NULL;
7540 	struct got_reference *ref = NULL;
7541 	const char *head_ref_name = NULL;
7542 	int ch;
7543 	struct tog_view *view;
7544 	int *pack_fds = NULL;
7545 
7546 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7547 		switch (ch) {
7548 		case 'c':
7549 			commit_id_arg = optarg;
7550 			break;
7551 		case 'r':
7552 			repo_path = realpath(optarg, NULL);
7553 			if (repo_path == NULL)
7554 				return got_error_from_errno2("realpath",
7555 				    optarg);
7556 			break;
7557 		default:
7558 			usage_tree();
7559 			/* NOTREACHED */
7560 		}
7561 	}
7562 
7563 	argc -= optind;
7564 	argv += optind;
7565 
7566 	if (argc > 1)
7567 		usage_tree();
7568 
7569 	error = got_repo_pack_fds_open(&pack_fds);
7570 	if (error != NULL)
7571 		goto done;
7572 
7573 	if (repo_path == NULL) {
7574 		cwd = getcwd(NULL, 0);
7575 		if (cwd == NULL)
7576 			return got_error_from_errno("getcwd");
7577 		error = got_worktree_open(&worktree, cwd);
7578 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7579 			goto done;
7580 		if (worktree)
7581 			repo_path =
7582 			    strdup(got_worktree_get_repo_path(worktree));
7583 		else
7584 			repo_path = strdup(cwd);
7585 		if (repo_path == NULL) {
7586 			error = got_error_from_errno("strdup");
7587 			goto done;
7588 		}
7589 	}
7590 
7591 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7592 	if (error != NULL)
7593 		goto done;
7594 
7595 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7596 	    repo, worktree);
7597 	if (error)
7598 		goto done;
7599 
7600 	init_curses();
7601 
7602 	error = apply_unveil(got_repo_get_path(repo), NULL);
7603 	if (error)
7604 		goto done;
7605 
7606 	error = tog_load_refs(repo, 0);
7607 	if (error)
7608 		goto done;
7609 
7610 	if (commit_id_arg == NULL) {
7611 		error = got_repo_match_object_id(&commit_id, &label,
7612 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7613 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7614 		if (error)
7615 			goto done;
7616 		head_ref_name = label;
7617 	} else {
7618 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7619 		if (error == NULL)
7620 			head_ref_name = got_ref_get_name(ref);
7621 		else if (error->code != GOT_ERR_NOT_REF)
7622 			goto done;
7623 		error = got_repo_match_object_id(&commit_id, NULL,
7624 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7625 		if (error)
7626 			goto done;
7627 	}
7628 
7629 	error = got_object_open_as_commit(&commit, repo, commit_id);
7630 	if (error)
7631 		goto done;
7632 
7633 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7634 	if (view == NULL) {
7635 		error = got_error_from_errno("view_open");
7636 		goto done;
7637 	}
7638 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7639 	if (error)
7640 		goto done;
7641 	if (!got_path_is_root_dir(in_repo_path)) {
7642 		error = tree_view_walk_path(&view->state.tree, commit,
7643 		    in_repo_path);
7644 		if (error)
7645 			goto done;
7646 	}
7647 
7648 	if (worktree) {
7649 		/* Release work tree lock. */
7650 		got_worktree_close(worktree);
7651 		worktree = NULL;
7652 	}
7653 	error = view_loop(view);
7654 done:
7655 	free(repo_path);
7656 	free(cwd);
7657 	free(commit_id);
7658 	free(label);
7659 	if (ref)
7660 		got_ref_close(ref);
7661 	if (repo) {
7662 		const struct got_error *close_err = got_repo_close(repo);
7663 		if (error == NULL)
7664 			error = close_err;
7665 	}
7666 	if (pack_fds) {
7667 		const struct got_error *pack_err =
7668 		    got_repo_pack_fds_close(pack_fds);
7669 		if (error == NULL)
7670 			error = pack_err;
7671 	}
7672 	tog_free_refs();
7673 	return error;
7674 }
7675 
7676 static const struct got_error *
7677 ref_view_load_refs(struct tog_ref_view_state *s)
7678 {
7679 	struct got_reflist_entry *sre;
7680 	struct tog_reflist_entry *re;
7681 
7682 	s->nrefs = 0;
7683 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7684 		if (strncmp(got_ref_get_name(sre->ref),
7685 		    "refs/got/", 9) == 0 &&
7686 		    strncmp(got_ref_get_name(sre->ref),
7687 		    "refs/got/backup/", 16) != 0)
7688 			continue;
7689 
7690 		re = malloc(sizeof(*re));
7691 		if (re == NULL)
7692 			return got_error_from_errno("malloc");
7693 
7694 		re->ref = got_ref_dup(sre->ref);
7695 		if (re->ref == NULL)
7696 			return got_error_from_errno("got_ref_dup");
7697 		re->idx = s->nrefs++;
7698 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7699 	}
7700 
7701 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7702 	return NULL;
7703 }
7704 
7705 static void
7706 ref_view_free_refs(struct tog_ref_view_state *s)
7707 {
7708 	struct tog_reflist_entry *re;
7709 
7710 	while (!TAILQ_EMPTY(&s->refs)) {
7711 		re = TAILQ_FIRST(&s->refs);
7712 		TAILQ_REMOVE(&s->refs, re, entry);
7713 		got_ref_close(re->ref);
7714 		free(re);
7715 	}
7716 }
7717 
7718 static const struct got_error *
7719 open_ref_view(struct tog_view *view, struct got_repository *repo)
7720 {
7721 	const struct got_error *err = NULL;
7722 	struct tog_ref_view_state *s = &view->state.ref;
7723 
7724 	s->selected_entry = 0;
7725 	s->repo = repo;
7726 
7727 	TAILQ_INIT(&s->refs);
7728 	STAILQ_INIT(&s->colors);
7729 
7730 	err = ref_view_load_refs(s);
7731 	if (err)
7732 		return err;
7733 
7734 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7735 		err = add_color(&s->colors, "^refs/heads/",
7736 		    TOG_COLOR_REFS_HEADS,
7737 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7738 		if (err)
7739 			goto done;
7740 
7741 		err = add_color(&s->colors, "^refs/tags/",
7742 		    TOG_COLOR_REFS_TAGS,
7743 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7744 		if (err)
7745 			goto done;
7746 
7747 		err = add_color(&s->colors, "^refs/remotes/",
7748 		    TOG_COLOR_REFS_REMOTES,
7749 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7750 		if (err)
7751 			goto done;
7752 
7753 		err = add_color(&s->colors, "^refs/got/backup/",
7754 		    TOG_COLOR_REFS_BACKUP,
7755 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7756 		if (err)
7757 			goto done;
7758 	}
7759 
7760 	view->show = show_ref_view;
7761 	view->input = input_ref_view;
7762 	view->close = close_ref_view;
7763 	view->search_start = search_start_ref_view;
7764 	view->search_next = search_next_ref_view;
7765 done:
7766 	if (err)
7767 		free_colors(&s->colors);
7768 	return err;
7769 }
7770 
7771 static const struct got_error *
7772 close_ref_view(struct tog_view *view)
7773 {
7774 	struct tog_ref_view_state *s = &view->state.ref;
7775 
7776 	ref_view_free_refs(s);
7777 	free_colors(&s->colors);
7778 
7779 	return NULL;
7780 }
7781 
7782 static const struct got_error *
7783 resolve_reflist_entry(struct got_object_id **commit_id,
7784     struct tog_reflist_entry *re, struct got_repository *repo)
7785 {
7786 	const struct got_error *err = NULL;
7787 	struct got_object_id *obj_id;
7788 	struct got_tag_object *tag = NULL;
7789 	int obj_type;
7790 
7791 	*commit_id = NULL;
7792 
7793 	err = got_ref_resolve(&obj_id, repo, re->ref);
7794 	if (err)
7795 		return err;
7796 
7797 	err = got_object_get_type(&obj_type, repo, obj_id);
7798 	if (err)
7799 		goto done;
7800 
7801 	switch (obj_type) {
7802 	case GOT_OBJ_TYPE_COMMIT:
7803 		*commit_id = obj_id;
7804 		break;
7805 	case GOT_OBJ_TYPE_TAG:
7806 		err = got_object_open_as_tag(&tag, repo, obj_id);
7807 		if (err)
7808 			goto done;
7809 		free(obj_id);
7810 		err = got_object_get_type(&obj_type, repo,
7811 		    got_object_tag_get_object_id(tag));
7812 		if (err)
7813 			goto done;
7814 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7815 			err = got_error(GOT_ERR_OBJ_TYPE);
7816 			goto done;
7817 		}
7818 		*commit_id = got_object_id_dup(
7819 		    got_object_tag_get_object_id(tag));
7820 		if (*commit_id == NULL) {
7821 			err = got_error_from_errno("got_object_id_dup");
7822 			goto done;
7823 		}
7824 		break;
7825 	default:
7826 		err = got_error(GOT_ERR_OBJ_TYPE);
7827 		break;
7828 	}
7829 
7830 done:
7831 	if (tag)
7832 		got_object_tag_close(tag);
7833 	if (err) {
7834 		free(*commit_id);
7835 		*commit_id = NULL;
7836 	}
7837 	return err;
7838 }
7839 
7840 static const struct got_error *
7841 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7842     struct tog_reflist_entry *re, struct got_repository *repo)
7843 {
7844 	struct tog_view *log_view;
7845 	const struct got_error *err = NULL;
7846 	struct got_object_id *commit_id = NULL;
7847 
7848 	*new_view = NULL;
7849 
7850 	err = resolve_reflist_entry(&commit_id, re, repo);
7851 	if (err) {
7852 		if (err->code != GOT_ERR_OBJ_TYPE)
7853 			return err;
7854 		else
7855 			return NULL;
7856 	}
7857 
7858 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7859 	if (log_view == NULL) {
7860 		err = got_error_from_errno("view_open");
7861 		goto done;
7862 	}
7863 
7864 	err = open_log_view(log_view, commit_id, repo,
7865 	    got_ref_get_name(re->ref), "", 0);
7866 done:
7867 	if (err)
7868 		view_close(log_view);
7869 	else
7870 		*new_view = log_view;
7871 	free(commit_id);
7872 	return err;
7873 }
7874 
7875 static void
7876 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7877 {
7878 	struct tog_reflist_entry *re;
7879 	int i = 0;
7880 
7881 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7882 		return;
7883 
7884 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7885 	while (i++ < maxscroll) {
7886 		if (re == NULL)
7887 			break;
7888 		s->first_displayed_entry = re;
7889 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7890 	}
7891 }
7892 
7893 static const struct got_error *
7894 ref_scroll_down(struct tog_view *view, int maxscroll)
7895 {
7896 	struct tog_ref_view_state *s = &view->state.ref;
7897 	struct tog_reflist_entry *next, *last;
7898 	int n = 0;
7899 
7900 	if (s->first_displayed_entry)
7901 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7902 	else
7903 		next = TAILQ_FIRST(&s->refs);
7904 
7905 	last = s->last_displayed_entry;
7906 	while (next && n++ < maxscroll) {
7907 		if (last) {
7908 			s->last_displayed_entry = last;
7909 			last = TAILQ_NEXT(last, entry);
7910 		}
7911 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7912 			s->first_displayed_entry = next;
7913 			next = TAILQ_NEXT(next, entry);
7914 		}
7915 	}
7916 
7917 	return NULL;
7918 }
7919 
7920 static const struct got_error *
7921 search_start_ref_view(struct tog_view *view)
7922 {
7923 	struct tog_ref_view_state *s = &view->state.ref;
7924 
7925 	s->matched_entry = NULL;
7926 	return NULL;
7927 }
7928 
7929 static int
7930 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7931 {
7932 	regmatch_t regmatch;
7933 
7934 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7935 	    0) == 0;
7936 }
7937 
7938 static const struct got_error *
7939 search_next_ref_view(struct tog_view *view)
7940 {
7941 	struct tog_ref_view_state *s = &view->state.ref;
7942 	struct tog_reflist_entry *re = NULL;
7943 
7944 	if (!view->searching) {
7945 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7946 		return NULL;
7947 	}
7948 
7949 	if (s->matched_entry) {
7950 		if (view->searching == TOG_SEARCH_FORWARD) {
7951 			if (s->selected_entry)
7952 				re = TAILQ_NEXT(s->selected_entry, entry);
7953 			else
7954 				re = TAILQ_PREV(s->selected_entry,
7955 				    tog_reflist_head, entry);
7956 		} else {
7957 			if (s->selected_entry == NULL)
7958 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7959 			else
7960 				re = TAILQ_PREV(s->selected_entry,
7961 				    tog_reflist_head, entry);
7962 		}
7963 	} else {
7964 		if (s->selected_entry)
7965 			re = s->selected_entry;
7966 		else if (view->searching == TOG_SEARCH_FORWARD)
7967 			re = TAILQ_FIRST(&s->refs);
7968 		else
7969 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7970 	}
7971 
7972 	while (1) {
7973 		if (re == NULL) {
7974 			if (s->matched_entry == NULL) {
7975 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7976 				return NULL;
7977 			}
7978 			if (view->searching == TOG_SEARCH_FORWARD)
7979 				re = TAILQ_FIRST(&s->refs);
7980 			else
7981 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7982 		}
7983 
7984 		if (match_reflist_entry(re, &view->regex)) {
7985 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7986 			s->matched_entry = re;
7987 			break;
7988 		}
7989 
7990 		if (view->searching == TOG_SEARCH_FORWARD)
7991 			re = TAILQ_NEXT(re, entry);
7992 		else
7993 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7994 	}
7995 
7996 	if (s->matched_entry) {
7997 		s->first_displayed_entry = s->matched_entry;
7998 		s->selected = 0;
7999 	}
8000 
8001 	return NULL;
8002 }
8003 
8004 static const struct got_error *
8005 show_ref_view(struct tog_view *view)
8006 {
8007 	const struct got_error *err = NULL;
8008 	struct tog_ref_view_state *s = &view->state.ref;
8009 	struct tog_reflist_entry *re;
8010 	char *line = NULL;
8011 	wchar_t *wline;
8012 	struct tog_color *tc;
8013 	int width, n;
8014 	int limit = view->nlines;
8015 
8016 	werase(view->window);
8017 
8018 	s->ndisplayed = 0;
8019 	if (view_is_hsplit_top(view))
8020 		--limit;  /* border */
8021 
8022 	if (limit == 0)
8023 		return NULL;
8024 
8025 	re = s->first_displayed_entry;
8026 
8027 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8028 	    s->nrefs) == -1)
8029 		return got_error_from_errno("asprintf");
8030 
8031 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8032 	if (err) {
8033 		free(line);
8034 		return err;
8035 	}
8036 	if (view_needs_focus_indication(view))
8037 		wstandout(view->window);
8038 	waddwstr(view->window, wline);
8039 	while (width++ < view->ncols)
8040 		waddch(view->window, ' ');
8041 	if (view_needs_focus_indication(view))
8042 		wstandend(view->window);
8043 	free(wline);
8044 	wline = NULL;
8045 	free(line);
8046 	line = NULL;
8047 	if (--limit <= 0)
8048 		return NULL;
8049 
8050 	n = 0;
8051 	while (re && limit > 0) {
8052 		char *line = NULL;
8053 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8054 
8055 		if (s->show_date) {
8056 			struct got_commit_object *ci;
8057 			struct got_tag_object *tag;
8058 			struct got_object_id *id;
8059 			struct tm tm;
8060 			time_t t;
8061 
8062 			err = got_ref_resolve(&id, s->repo, re->ref);
8063 			if (err)
8064 				return err;
8065 			err = got_object_open_as_tag(&tag, s->repo, id);
8066 			if (err) {
8067 				if (err->code != GOT_ERR_OBJ_TYPE) {
8068 					free(id);
8069 					return err;
8070 				}
8071 				err = got_object_open_as_commit(&ci, s->repo,
8072 				    id);
8073 				if (err) {
8074 					free(id);
8075 					return err;
8076 				}
8077 				t = got_object_commit_get_committer_time(ci);
8078 				got_object_commit_close(ci);
8079 			} else {
8080 				t = got_object_tag_get_tagger_time(tag);
8081 				got_object_tag_close(tag);
8082 			}
8083 			free(id);
8084 			if (gmtime_r(&t, &tm) == NULL)
8085 				return got_error_from_errno("gmtime_r");
8086 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8087 				return got_error(GOT_ERR_NO_SPACE);
8088 		}
8089 		if (got_ref_is_symbolic(re->ref)) {
8090 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8091 			    ymd : "", got_ref_get_name(re->ref),
8092 			    got_ref_get_symref_target(re->ref)) == -1)
8093 				return got_error_from_errno("asprintf");
8094 		} else if (s->show_ids) {
8095 			struct got_object_id *id;
8096 			char *id_str;
8097 			err = got_ref_resolve(&id, s->repo, re->ref);
8098 			if (err)
8099 				return err;
8100 			err = got_object_id_str(&id_str, id);
8101 			if (err) {
8102 				free(id);
8103 				return err;
8104 			}
8105 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8106 			    got_ref_get_name(re->ref), id_str) == -1) {
8107 				err = got_error_from_errno("asprintf");
8108 				free(id);
8109 				free(id_str);
8110 				return err;
8111 			}
8112 			free(id);
8113 			free(id_str);
8114 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8115 		    got_ref_get_name(re->ref)) == -1)
8116 			return got_error_from_errno("asprintf");
8117 
8118 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8119 		    0, 0);
8120 		if (err) {
8121 			free(line);
8122 			return err;
8123 		}
8124 		if (n == s->selected) {
8125 			if (view->focussed)
8126 				wstandout(view->window);
8127 			s->selected_entry = re;
8128 		}
8129 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8130 		if (tc)
8131 			wattr_on(view->window,
8132 			    COLOR_PAIR(tc->colorpair), NULL);
8133 		waddwstr(view->window, wline);
8134 		if (tc)
8135 			wattr_off(view->window,
8136 			    COLOR_PAIR(tc->colorpair), NULL);
8137 		if (width < view->ncols - 1)
8138 			waddch(view->window, '\n');
8139 		if (n == s->selected && view->focussed)
8140 			wstandend(view->window);
8141 		free(line);
8142 		free(wline);
8143 		wline = NULL;
8144 		n++;
8145 		s->ndisplayed++;
8146 		s->last_displayed_entry = re;
8147 
8148 		limit--;
8149 		re = TAILQ_NEXT(re, entry);
8150 	}
8151 
8152 	view_border(view);
8153 	return err;
8154 }
8155 
8156 static const struct got_error *
8157 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8158     struct tog_reflist_entry *re, struct got_repository *repo)
8159 {
8160 	const struct got_error *err = NULL;
8161 	struct got_object_id *commit_id = NULL;
8162 	struct tog_view *tree_view;
8163 
8164 	*new_view = NULL;
8165 
8166 	err = resolve_reflist_entry(&commit_id, re, repo);
8167 	if (err) {
8168 		if (err->code != GOT_ERR_OBJ_TYPE)
8169 			return err;
8170 		else
8171 			return NULL;
8172 	}
8173 
8174 
8175 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8176 	if (tree_view == NULL) {
8177 		err = got_error_from_errno("view_open");
8178 		goto done;
8179 	}
8180 
8181 	err = open_tree_view(tree_view, commit_id,
8182 	    got_ref_get_name(re->ref), repo);
8183 	if (err)
8184 		goto done;
8185 
8186 	*new_view = tree_view;
8187 done:
8188 	free(commit_id);
8189 	return err;
8190 }
8191 
8192 static const struct got_error *
8193 ref_goto_line(struct tog_view *view, int nlines)
8194 {
8195 	const struct got_error		*err = NULL;
8196 	struct tog_ref_view_state	*s = &view->state.ref;
8197 	int				 g, idx = s->selected_entry->idx;
8198 
8199 	g = view->gline;
8200 	view->gline = 0;
8201 
8202 	if (g == 0)
8203 		g = 1;
8204 	else if (g > s->nrefs)
8205 		g = s->nrefs;
8206 
8207 	if (g >= s->first_displayed_entry->idx + 1 &&
8208 	    g <= s->last_displayed_entry->idx + 1 &&
8209 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8210 		s->selected = g - s->first_displayed_entry->idx - 1;
8211 		return NULL;
8212 	}
8213 
8214 	if (idx + 1 < g) {
8215 		err = ref_scroll_down(view, g - idx - 1);
8216 		if (err)
8217 			return err;
8218 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8219 		    s->first_displayed_entry->idx + s->selected < g &&
8220 		    s->selected < s->ndisplayed - 1)
8221 			s->selected = g - s->first_displayed_entry->idx - 1;
8222 	} else if (idx + 1 > g)
8223 		ref_scroll_up(s, idx - g + 1);
8224 
8225 	if (g < nlines && s->first_displayed_entry->idx == 0)
8226 		s->selected = g - 1;
8227 
8228 	return NULL;
8229 
8230 }
8231 
8232 static const struct got_error *
8233 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8234 {
8235 	const struct got_error *err = NULL;
8236 	struct tog_ref_view_state *s = &view->state.ref;
8237 	struct tog_reflist_entry *re;
8238 	int n, nscroll = view->nlines - 1;
8239 
8240 	if (view->gline)
8241 		return ref_goto_line(view, nscroll);
8242 
8243 	switch (ch) {
8244 	case 'i':
8245 		s->show_ids = !s->show_ids;
8246 		view->count = 0;
8247 		break;
8248 	case 'm':
8249 		s->show_date = !s->show_date;
8250 		view->count = 0;
8251 		break;
8252 	case 'o':
8253 		s->sort_by_date = !s->sort_by_date;
8254 		view->count = 0;
8255 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8256 		    got_ref_cmp_by_commit_timestamp_descending :
8257 		    tog_ref_cmp_by_name, s->repo);
8258 		if (err)
8259 			break;
8260 		got_reflist_object_id_map_free(tog_refs_idmap);
8261 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8262 		    &tog_refs, s->repo);
8263 		if (err)
8264 			break;
8265 		ref_view_free_refs(s);
8266 		err = ref_view_load_refs(s);
8267 		break;
8268 	case KEY_ENTER:
8269 	case '\r':
8270 		view->count = 0;
8271 		if (!s->selected_entry)
8272 			break;
8273 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8274 		break;
8275 	case 'T':
8276 		view->count = 0;
8277 		if (!s->selected_entry)
8278 			break;
8279 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8280 		break;
8281 	case 'g':
8282 	case '=':
8283 	case KEY_HOME:
8284 		s->selected = 0;
8285 		view->count = 0;
8286 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8287 		break;
8288 	case 'G':
8289 	case '*':
8290 	case KEY_END: {
8291 		int eos = view->nlines - 1;
8292 
8293 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8294 			--eos;  /* border */
8295 		s->selected = 0;
8296 		view->count = 0;
8297 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8298 		for (n = 0; n < eos; n++) {
8299 			if (re == NULL)
8300 				break;
8301 			s->first_displayed_entry = re;
8302 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8303 		}
8304 		if (n > 0)
8305 			s->selected = n - 1;
8306 		break;
8307 	}
8308 	case 'k':
8309 	case KEY_UP:
8310 	case CTRL('p'):
8311 		if (s->selected > 0) {
8312 			s->selected--;
8313 			break;
8314 		}
8315 		ref_scroll_up(s, 1);
8316 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8317 			view->count = 0;
8318 		break;
8319 	case CTRL('u'):
8320 	case 'u':
8321 		nscroll /= 2;
8322 		/* FALL THROUGH */
8323 	case KEY_PPAGE:
8324 	case CTRL('b'):
8325 	case 'b':
8326 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8327 			s->selected -= MIN(nscroll, s->selected);
8328 		ref_scroll_up(s, MAX(0, nscroll));
8329 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8330 			view->count = 0;
8331 		break;
8332 	case 'j':
8333 	case KEY_DOWN:
8334 	case CTRL('n'):
8335 		if (s->selected < s->ndisplayed - 1) {
8336 			s->selected++;
8337 			break;
8338 		}
8339 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8340 			/* can't scroll any further */
8341 			view->count = 0;
8342 			break;
8343 		}
8344 		ref_scroll_down(view, 1);
8345 		break;
8346 	case CTRL('d'):
8347 	case 'd':
8348 		nscroll /= 2;
8349 		/* FALL THROUGH */
8350 	case KEY_NPAGE:
8351 	case CTRL('f'):
8352 	case 'f':
8353 	case ' ':
8354 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8355 			/* can't scroll any further; move cursor down */
8356 			if (s->selected < s->ndisplayed - 1)
8357 				s->selected += MIN(nscroll,
8358 				    s->ndisplayed - s->selected - 1);
8359 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8360 				s->selected += s->ndisplayed - s->selected - 1;
8361 			view->count = 0;
8362 			break;
8363 		}
8364 		ref_scroll_down(view, nscroll);
8365 		break;
8366 	case CTRL('l'):
8367 		view->count = 0;
8368 		tog_free_refs();
8369 		err = tog_load_refs(s->repo, s->sort_by_date);
8370 		if (err)
8371 			break;
8372 		ref_view_free_refs(s);
8373 		err = ref_view_load_refs(s);
8374 		break;
8375 	case KEY_RESIZE:
8376 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8377 			s->selected = view->nlines - 2;
8378 		break;
8379 	default:
8380 		view->count = 0;
8381 		break;
8382 	}
8383 
8384 	return err;
8385 }
8386 
8387 __dead static void
8388 usage_ref(void)
8389 {
8390 	endwin();
8391 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8392 	    getprogname());
8393 	exit(1);
8394 }
8395 
8396 static const struct got_error *
8397 cmd_ref(int argc, char *argv[])
8398 {
8399 	const struct got_error *error;
8400 	struct got_repository *repo = NULL;
8401 	struct got_worktree *worktree = NULL;
8402 	char *cwd = NULL, *repo_path = NULL;
8403 	int ch;
8404 	struct tog_view *view;
8405 	int *pack_fds = NULL;
8406 
8407 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8408 		switch (ch) {
8409 		case 'r':
8410 			repo_path = realpath(optarg, NULL);
8411 			if (repo_path == NULL)
8412 				return got_error_from_errno2("realpath",
8413 				    optarg);
8414 			break;
8415 		default:
8416 			usage_ref();
8417 			/* NOTREACHED */
8418 		}
8419 	}
8420 
8421 	argc -= optind;
8422 	argv += optind;
8423 
8424 	if (argc > 1)
8425 		usage_ref();
8426 
8427 	error = got_repo_pack_fds_open(&pack_fds);
8428 	if (error != NULL)
8429 		goto done;
8430 
8431 	if (repo_path == NULL) {
8432 		cwd = getcwd(NULL, 0);
8433 		if (cwd == NULL)
8434 			return got_error_from_errno("getcwd");
8435 		error = got_worktree_open(&worktree, cwd);
8436 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8437 			goto done;
8438 		if (worktree)
8439 			repo_path =
8440 			    strdup(got_worktree_get_repo_path(worktree));
8441 		else
8442 			repo_path = strdup(cwd);
8443 		if (repo_path == NULL) {
8444 			error = got_error_from_errno("strdup");
8445 			goto done;
8446 		}
8447 	}
8448 
8449 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8450 	if (error != NULL)
8451 		goto done;
8452 
8453 	init_curses();
8454 
8455 	error = apply_unveil(got_repo_get_path(repo), NULL);
8456 	if (error)
8457 		goto done;
8458 
8459 	error = tog_load_refs(repo, 0);
8460 	if (error)
8461 		goto done;
8462 
8463 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8464 	if (view == NULL) {
8465 		error = got_error_from_errno("view_open");
8466 		goto done;
8467 	}
8468 
8469 	error = open_ref_view(view, repo);
8470 	if (error)
8471 		goto done;
8472 
8473 	if (worktree) {
8474 		/* Release work tree lock. */
8475 		got_worktree_close(worktree);
8476 		worktree = NULL;
8477 	}
8478 	error = view_loop(view);
8479 done:
8480 	free(repo_path);
8481 	free(cwd);
8482 	if (repo) {
8483 		const struct got_error *close_err = got_repo_close(repo);
8484 		if (close_err)
8485 			error = close_err;
8486 	}
8487 	if (pack_fds) {
8488 		const struct got_error *pack_err =
8489 		    got_repo_pack_fds_close(pack_fds);
8490 		if (error == NULL)
8491 			error = pack_err;
8492 	}
8493 	tog_free_refs();
8494 	return error;
8495 }
8496 
8497 static const struct got_error*
8498 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8499     const char *str)
8500 {
8501 	size_t len;
8502 
8503 	if (win == NULL)
8504 		win = stdscr;
8505 
8506 	len = strlen(str);
8507 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8508 
8509 	if (focus)
8510 		wstandout(win);
8511 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8512 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8513 	if (focus)
8514 		wstandend(win);
8515 
8516 	return NULL;
8517 }
8518 
8519 static const struct got_error *
8520 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8521 {
8522 	off_t *p;
8523 
8524 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8525 	if (p == NULL) {
8526 		free(*line_offsets);
8527 		*line_offsets = NULL;
8528 		return got_error_from_errno("reallocarray");
8529 	}
8530 
8531 	*line_offsets = p;
8532 	(*line_offsets)[*nlines] = off;
8533 	++(*nlines);
8534 	return NULL;
8535 }
8536 
8537 static const struct got_error *
8538 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8539 {
8540 	*ret = 0;
8541 
8542 	for (;n > 0; --n, ++km) {
8543 		char	*t0, *t, *k;
8544 		size_t	 len = 1;
8545 
8546 		if (km->keys == NULL)
8547 			continue;
8548 
8549 		t = t0 = strdup(km->keys);
8550 		if (t0 == NULL)
8551 			return got_error_from_errno("strdup");
8552 
8553 		len += strlen(t);
8554 		while ((k = strsep(&t, " ")) != NULL)
8555 			len += strlen(k) > 1 ? 2 : 0;
8556 		free(t0);
8557 		*ret = MAX(*ret, len);
8558 	}
8559 
8560 	return NULL;
8561 }
8562 
8563 /*
8564  * Write keymap section headers, keys, and key info in km to f.
8565  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8566  * wrap control and symbolic keys in guillemets, else use <>.
8567  */
8568 static const struct got_error *
8569 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8570 {
8571 	int n, len = width;
8572 
8573 	if (km->keys) {
8574 		static const char *u8_glyph[] = {
8575 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8576 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8577 		};
8578 		char	*t0, *t, *k;
8579 		int	 cs, s, first = 1;
8580 
8581 		cs = got_locale_is_utf8();
8582 
8583 		t = t0 = strdup(km->keys);
8584 		if (t0 == NULL)
8585 			return got_error_from_errno("strdup");
8586 
8587 		len = strlen(km->keys);
8588 		while ((k = strsep(&t, " ")) != NULL) {
8589 			s = strlen(k) > 1;  /* control or symbolic key */
8590 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8591 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8592 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8593 			if (n < 0) {
8594 				free(t0);
8595 				return got_error_from_errno("fprintf");
8596 			}
8597 			first = 0;
8598 			len += s ? 2 : 0;
8599 			*off += n;
8600 		}
8601 		free(t0);
8602 	}
8603 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8604 	if (n < 0)
8605 		return got_error_from_errno("fprintf");
8606 	*off += n;
8607 
8608 	return NULL;
8609 }
8610 
8611 static const struct got_error *
8612 format_help(struct tog_help_view_state *s)
8613 {
8614 	const struct got_error		*err = NULL;
8615 	off_t				 off = 0;
8616 	int				 i, max, n, show = s->all;
8617 	static const struct tog_key_map	 km[] = {
8618 #define KEYMAP_(info, type)	{ NULL, (info), type }
8619 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8620 		GENERATE_HELP
8621 #undef KEYMAP_
8622 #undef KEY_
8623 	};
8624 
8625 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8626 	if (err)
8627 		return err;
8628 
8629 	n = nitems(km);
8630 	err = max_key_str(&max, km, n);
8631 	if (err)
8632 		return err;
8633 
8634 	for (i = 0; i < n; ++i) {
8635 		if (km[i].keys == NULL) {
8636 			show = s->all;
8637 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8638 			    km[i].type == s->type || s->all)
8639 				show = 1;
8640 		}
8641 		if (show) {
8642 			err = format_help_line(&off, s->f, &km[i], max);
8643 			if (err)
8644 				return err;
8645 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8646 			if (err)
8647 				return err;
8648 		}
8649 	}
8650 	fputc('\n', s->f);
8651 	++off;
8652 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8653 	return err;
8654 }
8655 
8656 static const struct got_error *
8657 create_help(struct tog_help_view_state *s)
8658 {
8659 	FILE			*f;
8660 	const struct got_error	*err;
8661 
8662 	free(s->line_offsets);
8663 	s->line_offsets = NULL;
8664 	s->nlines = 0;
8665 
8666 	f = got_opentemp();
8667 	if (f == NULL)
8668 		return got_error_from_errno("got_opentemp");
8669 	s->f = f;
8670 
8671 	err = format_help(s);
8672 	if (err)
8673 		return err;
8674 
8675 	if (s->f && fflush(s->f) != 0)
8676 		return got_error_from_errno("fflush");
8677 
8678 	return NULL;
8679 }
8680 
8681 static const struct got_error *
8682 search_start_help_view(struct tog_view *view)
8683 {
8684 	view->state.help.matched_line = 0;
8685 	return NULL;
8686 }
8687 
8688 static void
8689 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8690     size_t *nlines, int **first, int **last, int **match, int **selected)
8691 {
8692 	struct tog_help_view_state *s = &view->state.help;
8693 
8694 	*f = s->f;
8695 	*nlines = s->nlines;
8696 	*line_offsets = s->line_offsets;
8697 	*match = &s->matched_line;
8698 	*first = &s->first_displayed_line;
8699 	*last = &s->last_displayed_line;
8700 	*selected = &s->selected_line;
8701 }
8702 
8703 static const struct got_error *
8704 show_help_view(struct tog_view *view)
8705 {
8706 	struct tog_help_view_state	*s = &view->state.help;
8707 	const struct got_error		*err;
8708 	regmatch_t			*regmatch = &view->regmatch;
8709 	wchar_t				*wline;
8710 	char				*line;
8711 	ssize_t				 linelen;
8712 	size_t				 linesz = 0;
8713 	int				 width, nprinted = 0, rc = 0;
8714 	int				 eos = view->nlines;
8715 
8716 	if (view_is_hsplit_top(view))
8717 		--eos;  /* account for border */
8718 
8719 	s->lineno = 0;
8720 	rewind(s->f);
8721 	werase(view->window);
8722 
8723 	if (view->gline > s->nlines - 1)
8724 		view->gline = s->nlines - 1;
8725 
8726 	err = win_draw_center(view->window, 0, 0, view->ncols,
8727 	    view_needs_focus_indication(view),
8728 	    "tog help (press q to return to tog)");
8729 	if (err)
8730 		return err;
8731 	if (eos <= 1)
8732 		return NULL;
8733 	waddstr(view->window, "\n\n");
8734 	eos -= 2;
8735 
8736 	s->eof = 0;
8737 	view->maxx = 0;
8738 	line = NULL;
8739 	while (eos > 0 && nprinted < eos) {
8740 		attr_t attr = 0;
8741 
8742 		linelen = getline(&line, &linesz, s->f);
8743 		if (linelen == -1) {
8744 			if (!feof(s->f)) {
8745 				free(line);
8746 				return got_ferror(s->f, GOT_ERR_IO);
8747 			}
8748 			s->eof = 1;
8749 			break;
8750 		}
8751 		if (++s->lineno < s->first_displayed_line)
8752 			continue;
8753 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8754 			continue;
8755 		if (s->lineno == view->hiline)
8756 			attr = A_STANDOUT;
8757 
8758 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8759 		    view->x ? 1 : 0);
8760 		if (err) {
8761 			free(line);
8762 			return err;
8763 		}
8764 		view->maxx = MAX(view->maxx, width);
8765 		free(wline);
8766 		wline = NULL;
8767 
8768 		if (attr)
8769 			wattron(view->window, attr);
8770 		if (s->first_displayed_line + nprinted == s->matched_line &&
8771 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8772 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8773 			    view->window, view->x, regmatch);
8774 			if (err) {
8775 				free(line);
8776 				return err;
8777 			}
8778 		} else {
8779 			int skip;
8780 
8781 			err = format_line(&wline, &width, &skip, line,
8782 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8783 			if (err) {
8784 				free(line);
8785 				return err;
8786 			}
8787 			rc = waddwstr(view->window, &wline[skip]);
8788 			free(wline);
8789 			wline = NULL;
8790 			if (rc == ERR)
8791 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8792 		}
8793 		if (s->lineno == view->hiline) {
8794 			while (width++ < view->ncols)
8795 				waddch(view->window, ' ');
8796 		} else {
8797 			if (width <= view->ncols)
8798 				waddch(view->window, '\n');
8799 		}
8800 		if (attr)
8801 			wattroff(view->window, attr);
8802 		if (++nprinted == 1)
8803 			s->first_displayed_line = s->lineno;
8804 	}
8805 	free(line);
8806 	if (nprinted > 0)
8807 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8808 	else
8809 		s->last_displayed_line = s->first_displayed_line;
8810 
8811 	view_border(view);
8812 
8813 	if (s->eof) {
8814 		rc = waddnstr(view->window,
8815 		    "See the tog(1) manual page for full documentation",
8816 		    view->ncols - 1);
8817 		if (rc == ERR)
8818 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8819 	} else {
8820 		wmove(view->window, view->nlines - 1, 0);
8821 		wclrtoeol(view->window);
8822 		wstandout(view->window);
8823 		rc = waddnstr(view->window, "scroll down for more...",
8824 		    view->ncols - 1);
8825 		if (rc == ERR)
8826 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8827 		if (getcurx(view->window) < view->ncols - 6) {
8828 			rc = wprintw(view->window, "[%.0f%%]",
8829 			    100.00 * s->last_displayed_line / s->nlines);
8830 			if (rc == ERR)
8831 				return got_error_msg(GOT_ERR_IO, "wprintw");
8832 		}
8833 		wstandend(view->window);
8834 	}
8835 
8836 	return NULL;
8837 }
8838 
8839 static const struct got_error *
8840 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8841 {
8842 	struct tog_help_view_state	*s = &view->state.help;
8843 	const struct got_error		*err = NULL;
8844 	char				*line = NULL;
8845 	ssize_t				 linelen;
8846 	size_t				 linesz = 0;
8847 	int				 eos, nscroll;
8848 
8849 	eos = nscroll = view->nlines;
8850 	if (view_is_hsplit_top(view))
8851 		--eos;  /* border */
8852 
8853 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8854 
8855 	switch (ch) {
8856 	case '0':
8857 		view->x = 0;
8858 		break;
8859 	case '$':
8860 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8861 		view->count = 0;
8862 		break;
8863 	case KEY_RIGHT:
8864 	case 'l':
8865 		if (view->x + view->ncols / 3 < view->maxx)
8866 			view->x += 2;
8867 		else
8868 			view->count = 0;
8869 		break;
8870 	case KEY_LEFT:
8871 	case 'h':
8872 		view->x -= MIN(view->x, 2);
8873 		if (view->x <= 0)
8874 			view->count = 0;
8875 		break;
8876 	case 'g':
8877 	case KEY_HOME:
8878 		s->first_displayed_line = 1;
8879 		view->count = 0;
8880 		break;
8881 	case 'G':
8882 	case KEY_END:
8883 		view->count = 0;
8884 		if (s->eof)
8885 			break;
8886 		s->first_displayed_line = (s->nlines - eos) + 3;
8887 		s->eof = 1;
8888 		break;
8889 	case 'k':
8890 	case KEY_UP:
8891 		if (s->first_displayed_line > 1)
8892 			--s->first_displayed_line;
8893 		else
8894 			view->count = 0;
8895 		break;
8896 	case CTRL('u'):
8897 	case 'u':
8898 		nscroll /= 2;
8899 		/* FALL THROUGH */
8900 	case KEY_PPAGE:
8901 	case CTRL('b'):
8902 	case 'b':
8903 		if (s->first_displayed_line == 1) {
8904 			view->count = 0;
8905 			break;
8906 		}
8907 		while (--nscroll > 0 && s->first_displayed_line > 1)
8908 			s->first_displayed_line--;
8909 		break;
8910 	case 'j':
8911 	case KEY_DOWN:
8912 	case CTRL('n'):
8913 		if (!s->eof)
8914 			++s->first_displayed_line;
8915 		else
8916 			view->count = 0;
8917 		break;
8918 	case CTRL('d'):
8919 	case 'd':
8920 		nscroll /= 2;
8921 		/* FALL THROUGH */
8922 	case KEY_NPAGE:
8923 	case CTRL('f'):
8924 	case 'f':
8925 	case ' ':
8926 		if (s->eof) {
8927 			view->count = 0;
8928 			break;
8929 		}
8930 		while (!s->eof && --nscroll > 0) {
8931 			linelen = getline(&line, &linesz, s->f);
8932 			s->first_displayed_line++;
8933 			if (linelen == -1) {
8934 				if (feof(s->f))
8935 					s->eof = 1;
8936 				else
8937 					err = got_ferror(s->f, GOT_ERR_IO);
8938 				break;
8939 			}
8940 		}
8941 		free(line);
8942 		break;
8943 	default:
8944 		view->count = 0;
8945 		break;
8946 	}
8947 
8948 	return err;
8949 }
8950 
8951 static const struct got_error *
8952 close_help_view(struct tog_view *view)
8953 {
8954 	struct tog_help_view_state *s = &view->state.help;
8955 
8956 	free(s->line_offsets);
8957 	s->line_offsets = NULL;
8958 	if (fclose(s->f) == EOF)
8959 		return got_error_from_errno("fclose");
8960 
8961 	return NULL;
8962 }
8963 
8964 static const struct got_error *
8965 reset_help_view(struct tog_view *view)
8966 {
8967 	struct tog_help_view_state *s = &view->state.help;
8968 
8969 
8970 	if (s->f && fclose(s->f) == EOF)
8971 		return got_error_from_errno("fclose");
8972 
8973 	wclear(view->window);
8974 	view->count = 0;
8975 	view->x = 0;
8976 	s->all = !s->all;
8977 	s->first_displayed_line = 1;
8978 	s->last_displayed_line = view->nlines;
8979 	s->matched_line = 0;
8980 
8981 	return create_help(s);
8982 }
8983 
8984 static const struct got_error *
8985 open_help_view(struct tog_view *view, struct tog_view *parent)
8986 {
8987 	const struct got_error		*err = NULL;
8988 	struct tog_help_view_state	*s = &view->state.help;
8989 
8990 	s->type = (enum tog_keymap_type)parent->type;
8991 	s->first_displayed_line = 1;
8992 	s->last_displayed_line = view->nlines;
8993 	s->selected_line = 1;
8994 
8995 	view->show = show_help_view;
8996 	view->input = input_help_view;
8997 	view->reset = reset_help_view;
8998 	view->close = close_help_view;
8999 	view->search_start = search_start_help_view;
9000 	view->search_setup = search_setup_help_view;
9001 	view->search_next = search_next_view_match;
9002 
9003 	err = create_help(s);
9004 	return err;
9005 }
9006 
9007 static const struct got_error *
9008 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9009     enum tog_view_type request, int y, int x)
9010 {
9011 	const struct got_error *err = NULL;
9012 
9013 	*new_view = NULL;
9014 
9015 	switch (request) {
9016 	case TOG_VIEW_DIFF:
9017 		if (view->type == TOG_VIEW_LOG) {
9018 			struct tog_log_view_state *s = &view->state.log;
9019 
9020 			err = open_diff_view_for_commit(new_view, y, x,
9021 			    s->selected_entry->commit, s->selected_entry->id,
9022 			    view, s->repo);
9023 		} else
9024 			return got_error_msg(GOT_ERR_NOT_IMPL,
9025 			    "parent/child view pair not supported");
9026 		break;
9027 	case TOG_VIEW_BLAME:
9028 		if (view->type == TOG_VIEW_TREE) {
9029 			struct tog_tree_view_state *s = &view->state.tree;
9030 
9031 			err = blame_tree_entry(new_view, y, x,
9032 			    s->selected_entry, &s->parents, s->commit_id,
9033 			    s->repo);
9034 		} else
9035 			return got_error_msg(GOT_ERR_NOT_IMPL,
9036 			    "parent/child view pair not supported");
9037 		break;
9038 	case TOG_VIEW_LOG:
9039 		if (view->type == TOG_VIEW_BLAME)
9040 			err = log_annotated_line(new_view, y, x,
9041 			    view->state.blame.repo, view->state.blame.id_to_log);
9042 		else if (view->type == TOG_VIEW_TREE)
9043 			err = log_selected_tree_entry(new_view, y, x,
9044 			    &view->state.tree);
9045 		else if (view->type == TOG_VIEW_REF)
9046 			err = log_ref_entry(new_view, y, x,
9047 			    view->state.ref.selected_entry,
9048 			    view->state.ref.repo);
9049 		else
9050 			return got_error_msg(GOT_ERR_NOT_IMPL,
9051 			    "parent/child view pair not supported");
9052 		break;
9053 	case TOG_VIEW_TREE:
9054 		if (view->type == TOG_VIEW_LOG)
9055 			err = browse_commit_tree(new_view, y, x,
9056 			    view->state.log.selected_entry,
9057 			    view->state.log.in_repo_path,
9058 			    view->state.log.head_ref_name,
9059 			    view->state.log.repo);
9060 		else if (view->type == TOG_VIEW_REF)
9061 			err = browse_ref_tree(new_view, y, x,
9062 			    view->state.ref.selected_entry,
9063 			    view->state.ref.repo);
9064 		else
9065 			return got_error_msg(GOT_ERR_NOT_IMPL,
9066 			    "parent/child view pair not supported");
9067 		break;
9068 	case TOG_VIEW_REF:
9069 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9070 		if (*new_view == NULL)
9071 			return got_error_from_errno("view_open");
9072 		if (view->type == TOG_VIEW_LOG)
9073 			err = open_ref_view(*new_view, view->state.log.repo);
9074 		else if (view->type == TOG_VIEW_TREE)
9075 			err = open_ref_view(*new_view, view->state.tree.repo);
9076 		else
9077 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9078 			    "parent/child view pair not supported");
9079 		if (err)
9080 			view_close(*new_view);
9081 		break;
9082 	case TOG_VIEW_HELP:
9083 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9084 		if (*new_view == NULL)
9085 			return got_error_from_errno("view_open");
9086 		err = open_help_view(*new_view, view);
9087 		if (err)
9088 			view_close(*new_view);
9089 		break;
9090 	default:
9091 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9092 	}
9093 
9094 	return err;
9095 }
9096 
9097 /*
9098  * If view was scrolled down to move the selected line into view when opening a
9099  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9100  */
9101 static void
9102 offset_selection_up(struct tog_view *view)
9103 {
9104 	switch (view->type) {
9105 	case TOG_VIEW_BLAME: {
9106 		struct tog_blame_view_state *s = &view->state.blame;
9107 		if (s->first_displayed_line == 1) {
9108 			s->selected_line = MAX(s->selected_line - view->offset,
9109 			    1);
9110 			break;
9111 		}
9112 		if (s->first_displayed_line > view->offset)
9113 			s->first_displayed_line -= view->offset;
9114 		else
9115 			s->first_displayed_line = 1;
9116 		s->selected_line += view->offset;
9117 		break;
9118 	}
9119 	case TOG_VIEW_LOG:
9120 		log_scroll_up(&view->state.log, view->offset);
9121 		view->state.log.selected += view->offset;
9122 		break;
9123 	case TOG_VIEW_REF:
9124 		ref_scroll_up(&view->state.ref, view->offset);
9125 		view->state.ref.selected += view->offset;
9126 		break;
9127 	case TOG_VIEW_TREE:
9128 		tree_scroll_up(&view->state.tree, view->offset);
9129 		view->state.tree.selected += view->offset;
9130 		break;
9131 	default:
9132 		break;
9133 	}
9134 
9135 	view->offset = 0;
9136 }
9137 
9138 /*
9139  * If the selected line is in the section of screen covered by the bottom split,
9140  * scroll down offset lines to move it into view and index its new position.
9141  */
9142 static const struct got_error *
9143 offset_selection_down(struct tog_view *view)
9144 {
9145 	const struct got_error	*err = NULL;
9146 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9147 	int			*selected = NULL;
9148 	int			 header, offset;
9149 
9150 	switch (view->type) {
9151 	case TOG_VIEW_BLAME: {
9152 		struct tog_blame_view_state *s = &view->state.blame;
9153 		header = 3;
9154 		scrolld = NULL;
9155 		if (s->selected_line > view->nlines - header) {
9156 			offset = abs(view->nlines - s->selected_line - header);
9157 			s->first_displayed_line += offset;
9158 			s->selected_line -= offset;
9159 			view->offset = offset;
9160 		}
9161 		break;
9162 	}
9163 	case TOG_VIEW_LOG: {
9164 		struct tog_log_view_state *s = &view->state.log;
9165 		scrolld = &log_scroll_down;
9166 		header = view_is_parent_view(view) ? 3 : 2;
9167 		selected = &s->selected;
9168 		break;
9169 	}
9170 	case TOG_VIEW_REF: {
9171 		struct tog_ref_view_state *s = &view->state.ref;
9172 		scrolld = &ref_scroll_down;
9173 		header = 3;
9174 		selected = &s->selected;
9175 		break;
9176 	}
9177 	case TOG_VIEW_TREE: {
9178 		struct tog_tree_view_state *s = &view->state.tree;
9179 		scrolld = &tree_scroll_down;
9180 		header = 5;
9181 		selected = &s->selected;
9182 		break;
9183 	}
9184 	default:
9185 		selected = NULL;
9186 		scrolld = NULL;
9187 		header = 0;
9188 		break;
9189 	}
9190 
9191 	if (selected && *selected > view->nlines - header) {
9192 		offset = abs(view->nlines - *selected - header);
9193 		view->offset = offset;
9194 		if (scrolld && offset) {
9195 			err = scrolld(view, offset);
9196 			*selected -= offset;
9197 		}
9198 	}
9199 
9200 	return err;
9201 }
9202 
9203 static void
9204 list_commands(FILE *fp)
9205 {
9206 	size_t i;
9207 
9208 	fprintf(fp, "commands:");
9209 	for (i = 0; i < nitems(tog_commands); i++) {
9210 		const struct tog_cmd *cmd = &tog_commands[i];
9211 		fprintf(fp, " %s", cmd->name);
9212 	}
9213 	fputc('\n', fp);
9214 }
9215 
9216 __dead static void
9217 usage(int hflag, int status)
9218 {
9219 	FILE *fp = (status == 0) ? stdout : stderr;
9220 
9221 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9222 	    getprogname());
9223 	if (hflag) {
9224 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9225 		list_commands(fp);
9226 	}
9227 	exit(status);
9228 }
9229 
9230 static char **
9231 make_argv(int argc, ...)
9232 {
9233 	va_list ap;
9234 	char **argv;
9235 	int i;
9236 
9237 	va_start(ap, argc);
9238 
9239 	argv = calloc(argc, sizeof(char *));
9240 	if (argv == NULL)
9241 		err(1, "calloc");
9242 	for (i = 0; i < argc; i++) {
9243 		argv[i] = strdup(va_arg(ap, char *));
9244 		if (argv[i] == NULL)
9245 			err(1, "strdup");
9246 	}
9247 
9248 	va_end(ap);
9249 	return argv;
9250 }
9251 
9252 /*
9253  * Try to convert 'tog path' into a 'tog log path' command.
9254  * The user could simply have mistyped the command rather than knowingly
9255  * provided a path. So check whether argv[0] can in fact be resolved
9256  * to a path in the HEAD commit and print a special error if not.
9257  * This hack is for mpi@ <3
9258  */
9259 static const struct got_error *
9260 tog_log_with_path(int argc, char *argv[])
9261 {
9262 	const struct got_error *error = NULL, *close_err;
9263 	const struct tog_cmd *cmd = NULL;
9264 	struct got_repository *repo = NULL;
9265 	struct got_worktree *worktree = NULL;
9266 	struct got_object_id *commit_id = NULL, *id = NULL;
9267 	struct got_commit_object *commit = NULL;
9268 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9269 	char *commit_id_str = NULL, **cmd_argv = NULL;
9270 	int *pack_fds = NULL;
9271 
9272 	cwd = getcwd(NULL, 0);
9273 	if (cwd == NULL)
9274 		return got_error_from_errno("getcwd");
9275 
9276 	error = got_repo_pack_fds_open(&pack_fds);
9277 	if (error != NULL)
9278 		goto done;
9279 
9280 	error = got_worktree_open(&worktree, cwd);
9281 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9282 		goto done;
9283 
9284 	if (worktree)
9285 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9286 	else
9287 		repo_path = strdup(cwd);
9288 	if (repo_path == NULL) {
9289 		error = got_error_from_errno("strdup");
9290 		goto done;
9291 	}
9292 
9293 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9294 	if (error != NULL)
9295 		goto done;
9296 
9297 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9298 	    repo, worktree);
9299 	if (error)
9300 		goto done;
9301 
9302 	error = tog_load_refs(repo, 0);
9303 	if (error)
9304 		goto done;
9305 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9306 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9307 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9308 	if (error)
9309 		goto done;
9310 
9311 	if (worktree) {
9312 		got_worktree_close(worktree);
9313 		worktree = NULL;
9314 	}
9315 
9316 	error = got_object_open_as_commit(&commit, repo, commit_id);
9317 	if (error)
9318 		goto done;
9319 
9320 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9321 	if (error) {
9322 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9323 			goto done;
9324 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9325 		    getprogname(), argv[0]);
9326 		usage(1, 1);
9327 		/* not reached */
9328 	}
9329 
9330 	error = got_object_id_str(&commit_id_str, commit_id);
9331 	if (error)
9332 		goto done;
9333 
9334 	cmd = &tog_commands[0]; /* log */
9335 	argc = 4;
9336 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9337 	error = cmd->cmd_main(argc, cmd_argv);
9338 done:
9339 	if (repo) {
9340 		close_err = got_repo_close(repo);
9341 		if (error == NULL)
9342 			error = close_err;
9343 	}
9344 	if (commit)
9345 		got_object_commit_close(commit);
9346 	if (worktree)
9347 		got_worktree_close(worktree);
9348 	if (pack_fds) {
9349 		const struct got_error *pack_err =
9350 		    got_repo_pack_fds_close(pack_fds);
9351 		if (error == NULL)
9352 			error = pack_err;
9353 	}
9354 	free(id);
9355 	free(commit_id_str);
9356 	free(commit_id);
9357 	free(cwd);
9358 	free(repo_path);
9359 	free(in_repo_path);
9360 	if (cmd_argv) {
9361 		int i;
9362 		for (i = 0; i < argc; i++)
9363 			free(cmd_argv[i]);
9364 		free(cmd_argv);
9365 	}
9366 	tog_free_refs();
9367 	return error;
9368 }
9369 
9370 int
9371 main(int argc, char *argv[])
9372 {
9373 	const struct got_error *error = NULL;
9374 	const struct tog_cmd *cmd = NULL;
9375 	int ch, hflag = 0, Vflag = 0;
9376 	char **cmd_argv = NULL;
9377 	static const struct option longopts[] = {
9378 	    { "version", no_argument, NULL, 'V' },
9379 	    { NULL, 0, NULL, 0}
9380 	};
9381 	char *diff_algo_str = NULL;
9382 
9383 	if (!isatty(STDIN_FILENO))
9384 		errx(1, "standard input is not a tty");
9385 
9386 	setlocale(LC_CTYPE, "");
9387 
9388 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9389 		switch (ch) {
9390 		case 'h':
9391 			hflag = 1;
9392 			break;
9393 		case 'V':
9394 			Vflag = 1;
9395 			break;
9396 		default:
9397 			usage(hflag, 1);
9398 			/* NOTREACHED */
9399 		}
9400 	}
9401 
9402 	argc -= optind;
9403 	argv += optind;
9404 	optind = 1;
9405 	optreset = 1;
9406 
9407 	if (Vflag) {
9408 		got_version_print_str();
9409 		return 0;
9410 	}
9411 
9412 #ifndef PROFILE
9413 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9414 	    NULL) == -1)
9415 		err(1, "pledge");
9416 #endif
9417 
9418 	if (argc == 0) {
9419 		if (hflag)
9420 			usage(hflag, 0);
9421 		/* Build an argument vector which runs a default command. */
9422 		cmd = &tog_commands[0];
9423 		argc = 1;
9424 		cmd_argv = make_argv(argc, cmd->name);
9425 	} else {
9426 		size_t i;
9427 
9428 		/* Did the user specify a command? */
9429 		for (i = 0; i < nitems(tog_commands); i++) {
9430 			if (strncmp(tog_commands[i].name, argv[0],
9431 			    strlen(argv[0])) == 0) {
9432 				cmd = &tog_commands[i];
9433 				break;
9434 			}
9435 		}
9436 	}
9437 
9438 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9439 	if (diff_algo_str) {
9440 		if (strcasecmp(diff_algo_str, "patience") == 0)
9441 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9442 		if (strcasecmp(diff_algo_str, "myers") == 0)
9443 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9444 	}
9445 
9446 	if (cmd == NULL) {
9447 		if (argc != 1)
9448 			usage(0, 1);
9449 		/* No command specified; try log with a path */
9450 		error = tog_log_with_path(argc, argv);
9451 	} else {
9452 		if (hflag)
9453 			cmd->cmd_usage();
9454 		else
9455 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9456 	}
9457 
9458 	endwin();
9459 	putchar('\n');
9460 	if (cmd_argv) {
9461 		int i;
9462 		for (i = 0; i < argc; i++)
9463 			free(cmd_argv[i]);
9464 		free(cmd_argv);
9465 	}
9466 
9467 	if (error && error->code != GOT_ERR_CANCELLED &&
9468 	    error->code != GOT_ERR_EOF &&
9469 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9470 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9471 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9472 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9473 	return 0;
9474 }