1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g Home", "Go to line N (default: first line)"), \
537 	KEY_("G End", "Go to line N (default: last line)"), \
538 	KEY_("l Right", "Scroll the view right"), \
539 	KEY_("h Left", "Scroll the view left"), \
540 	KEY_("$", "Scroll view to the rightmost position"), \
541 	KEY_("0", "Scroll view to the leftmost position"), \
542 	KEY_("-", "Decrease size of the focussed split"), \
543 	KEY_("+", "Increase size of the focussed split"), \
544 	KEY_("Tab", "Switch focus between views"), \
545 	KEY_("F", "Toggle fullscreen mode"), \
546 	KEY_("/", "Open prompt to enter search term"), \
547 	KEY_("n", "Find next line/token matching the current search term"), \
548 	KEY_("N", "Find previous line/token matching the current search term"),\
549 	KEY_("q", "Quit the focussed view; Quit help screen"), \
550 	KEY_("Q", "Quit tog"), \
551 	\
552 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
553 	KEY_("< ,", "Move cursor up one commit"), \
554 	KEY_("> .", "Move cursor down one commit"), \
555 	KEY_("Enter", "Open diff view of the selected commit"), \
556 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
557 	KEY_("R", "Open ref view of all repository references"), \
558 	KEY_("T", "Display tree view of the repository from the selected" \
559 	    " commit"), \
560 	KEY_("@", "Toggle between displaying author and committer name"), \
561 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
562 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
563 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
564 	\
565 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
566 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
567 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
568 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
569 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
570 	    " data"), \
571 	KEY_("(", "Go to the previous file in the diff"), \
572 	KEY_(")", "Go to the next file in the diff"), \
573 	KEY_("{", "Go to the previous hunk in the diff"), \
574 	KEY_("}", "Go to the next hunk in the diff"), \
575 	KEY_("[", "Decrease the number of context lines"), \
576 	KEY_("]", "Increase the number of context lines"), \
577 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
578 	\
579 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
580 	KEY_("Enter", "Display diff view of the selected line's commit"), \
581 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
582 	KEY_("L", "Open log view for the currently selected annotated line"), \
583 	KEY_("C", "Reload view with the previously blamed commit"), \
584 	KEY_("c", "Reload view with the version of the file found in the" \
585 	    " selected line's commit"), \
586 	KEY_("p", "Reload view with the version of the file found in the" \
587 	    " selected line's parent commit"), \
588 	\
589 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
590 	KEY_("Enter", "Enter selected directory or open blame view of the" \
591 	    " selected file"), \
592 	KEY_("L", "Open log view for the selected entry"), \
593 	KEY_("R", "Open ref view of all repository references"), \
594 	KEY_("i", "Show object IDs for all tree entries"), \
595 	KEY_("Backspace", "Return to the parent directory"), \
596 	\
597 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
598 	KEY_("Enter", "Display log view of the selected reference"), \
599 	KEY_("T", "Display tree view of the selected reference"), \
600 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
601 	KEY_("m", "Toggle display of last modified date for each reference"), \
602 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
603 	KEY_("C-l", "Reload view with all repository references")
604 
605 struct tog_key_map {
606 	const char		*keys;
607 	const char		*info;
608 	enum tog_keymap_type	 type;
609 };
610 
611 /*
612  * We implement two types of views: parent views and child views.
613  *
614  * The 'Tab' key switches focus between a parent view and its child view.
615  * Child views are shown side-by-side to their parent view, provided
616  * there is enough screen estate.
617  *
618  * When a new view is opened from within a parent view, this new view
619  * becomes a child view of the parent view, replacing any existing child.
620  *
621  * When a new view is opened from within a child view, this new view
622  * becomes a parent view which will obscure the views below until the
623  * user quits the new parent view by typing 'q'.
624  *
625  * This list of views contains parent views only.
626  * Child views are only pointed to by their parent view.
627  */
628 TAILQ_HEAD(tog_view_list_head, tog_view);
629 
630 struct tog_view {
631 	TAILQ_ENTRY(tog_view) entry;
632 	WINDOW *window;
633 	PANEL *panel;
634 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
635 	int resized_y, resized_x; /* begin_y/x based on user resizing */
636 	int maxx, x; /* max column and current start column */
637 	int lines, cols; /* copies of LINES and COLS */
638 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
639 	int gline, hiline; /* navigate to and highlight this nG line */
640 	int ch, count; /* current keymap and count prefix */
641 	int resized; /* set when in a resize event */
642 	int focussed; /* Only set on one parent or child view at a time. */
643 	int dying;
644 	struct tog_view *parent;
645 	struct tog_view *child;
646 
647 	/*
648 	 * This flag is initially set on parent views when a new child view
649 	 * is created. It gets toggled when the 'Tab' key switches focus
650 	 * between parent and child.
651 	 * The flag indicates whether focus should be passed on to our child
652 	 * view if this parent view gets picked for focus after another parent
653 	 * view was closed. This prevents child views from losing focus in such
654 	 * situations.
655 	 */
656 	int focus_child;
657 
658 	enum tog_view_mode mode;
659 	/* type-specific state */
660 	enum tog_view_type type;
661 	union {
662 		struct tog_diff_view_state diff;
663 		struct tog_log_view_state log;
664 		struct tog_blame_view_state blame;
665 		struct tog_tree_view_state tree;
666 		struct tog_ref_view_state ref;
667 		struct tog_help_view_state help;
668 	} state;
669 
670 	const struct got_error *(*show)(struct tog_view *);
671 	const struct got_error *(*input)(struct tog_view **,
672 	    struct tog_view *, int);
673 	const struct got_error *(*reset)(struct tog_view *);
674 	const struct got_error *(*resize)(struct tog_view *, int);
675 	const struct got_error *(*close)(struct tog_view *);
676 
677 	const struct got_error *(*search_start)(struct tog_view *);
678 	const struct got_error *(*search_next)(struct tog_view *);
679 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
680 	    int **, int **, int **, int **);
681 	int search_started;
682 	int searching;
683 #define TOG_SEARCH_FORWARD	1
684 #define TOG_SEARCH_BACKWARD	2
685 	int search_next_done;
686 #define TOG_SEARCH_HAVE_MORE	1
687 #define TOG_SEARCH_NO_MORE	2
688 #define TOG_SEARCH_HAVE_NONE	3
689 	regex_t regex;
690 	regmatch_t regmatch;
691 };
692 
693 static const struct got_error *open_diff_view(struct tog_view *,
694     struct got_object_id *, struct got_object_id *,
695     const char *, const char *, int, int, int, struct tog_view *,
696     struct got_repository *);
697 static const struct got_error *show_diff_view(struct tog_view *);
698 static const struct got_error *input_diff_view(struct tog_view **,
699     struct tog_view *, int);
700 static const struct got_error *reset_diff_view(struct tog_view *);
701 static const struct got_error* close_diff_view(struct tog_view *);
702 static const struct got_error *search_start_diff_view(struct tog_view *);
703 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
704     size_t *, int **, int **, int **, int **);
705 static const struct got_error *search_next_view_match(struct tog_view *);
706 
707 static const struct got_error *open_log_view(struct tog_view *,
708     struct got_object_id *, struct got_repository *,
709     const char *, const char *, int);
710 static const struct got_error * show_log_view(struct tog_view *);
711 static const struct got_error *input_log_view(struct tog_view **,
712     struct tog_view *, int);
713 static const struct got_error *resize_log_view(struct tog_view *, int);
714 static const struct got_error *close_log_view(struct tog_view *);
715 static const struct got_error *search_start_log_view(struct tog_view *);
716 static const struct got_error *search_next_log_view(struct tog_view *);
717 
718 static const struct got_error *open_blame_view(struct tog_view *, char *,
719     struct got_object_id *, struct got_repository *);
720 static const struct got_error *show_blame_view(struct tog_view *);
721 static const struct got_error *input_blame_view(struct tog_view **,
722     struct tog_view *, int);
723 static const struct got_error *reset_blame_view(struct tog_view *);
724 static const struct got_error *close_blame_view(struct tog_view *);
725 static const struct got_error *search_start_blame_view(struct tog_view *);
726 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
727     size_t *, int **, int **, int **, int **);
728 
729 static const struct got_error *open_tree_view(struct tog_view *,
730     struct got_object_id *, const char *, struct got_repository *);
731 static const struct got_error *show_tree_view(struct tog_view *);
732 static const struct got_error *input_tree_view(struct tog_view **,
733     struct tog_view *, int);
734 static const struct got_error *close_tree_view(struct tog_view *);
735 static const struct got_error *search_start_tree_view(struct tog_view *);
736 static const struct got_error *search_next_tree_view(struct tog_view *);
737 
738 static const struct got_error *open_ref_view(struct tog_view *,
739     struct got_repository *);
740 static const struct got_error *show_ref_view(struct tog_view *);
741 static const struct got_error *input_ref_view(struct tog_view **,
742     struct tog_view *, int);
743 static const struct got_error *close_ref_view(struct tog_view *);
744 static const struct got_error *search_start_ref_view(struct tog_view *);
745 static const struct got_error *search_next_ref_view(struct tog_view *);
746 
747 static const struct got_error *open_help_view(struct tog_view *,
748     struct tog_view *);
749 static const struct got_error *show_help_view(struct tog_view *);
750 static const struct got_error *input_help_view(struct tog_view **,
751     struct tog_view *, int);
752 static const struct got_error *reset_help_view(struct tog_view *);
753 static const struct got_error* close_help_view(struct tog_view *);
754 static const struct got_error *search_start_help_view(struct tog_view *);
755 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
756     size_t *, int **, int **, int **, int **);
757 
758 static volatile sig_atomic_t tog_sigwinch_received;
759 static volatile sig_atomic_t tog_sigpipe_received;
760 static volatile sig_atomic_t tog_sigcont_received;
761 static volatile sig_atomic_t tog_sigint_received;
762 static volatile sig_atomic_t tog_sigterm_received;
763 
764 static void
765 tog_sigwinch(int signo)
766 {
767 	tog_sigwinch_received = 1;
768 }
769 
770 static void
771 tog_sigpipe(int signo)
772 {
773 	tog_sigpipe_received = 1;
774 }
775 
776 static void
777 tog_sigcont(int signo)
778 {
779 	tog_sigcont_received = 1;
780 }
781 
782 static void
783 tog_sigint(int signo)
784 {
785 	tog_sigint_received = 1;
786 }
787 
788 static void
789 tog_sigterm(int signo)
790 {
791 	tog_sigterm_received = 1;
792 }
793 
794 static int
795 tog_fatal_signal_received(void)
796 {
797 	return (tog_sigpipe_received ||
798 	    tog_sigint_received || tog_sigterm_received);
799 }
800 
801 static const struct got_error *
802 view_close(struct tog_view *view)
803 {
804 	const struct got_error *err = NULL, *child_err = NULL;
805 
806 	if (view->child) {
807 		child_err = view_close(view->child);
808 		view->child = NULL;
809 	}
810 	if (view->close)
811 		err = view->close(view);
812 	if (view->panel)
813 		del_panel(view->panel);
814 	if (view->window)
815 		delwin(view->window);
816 	free(view);
817 	return err ? err : child_err;
818 }
819 
820 static struct tog_view *
821 view_open(int nlines, int ncols, int begin_y, int begin_x,
822     enum tog_view_type type)
823 {
824 	struct tog_view *view = calloc(1, sizeof(*view));
825 
826 	if (view == NULL)
827 		return NULL;
828 
829 	view->type = type;
830 	view->lines = LINES;
831 	view->cols = COLS;
832 	view->nlines = nlines ? nlines : LINES - begin_y;
833 	view->ncols = ncols ? ncols : COLS - begin_x;
834 	view->begin_y = begin_y;
835 	view->begin_x = begin_x;
836 	view->window = newwin(nlines, ncols, begin_y, begin_x);
837 	if (view->window == NULL) {
838 		view_close(view);
839 		return NULL;
840 	}
841 	view->panel = new_panel(view->window);
842 	if (view->panel == NULL ||
843 	    set_panel_userptr(view->panel, view) != OK) {
844 		view_close(view);
845 		return NULL;
846 	}
847 
848 	keypad(view->window, TRUE);
849 	return view;
850 }
851 
852 static int
853 view_split_begin_x(int begin_x)
854 {
855 	if (begin_x > 0 || COLS < 120)
856 		return 0;
857 	return (COLS - MAX(COLS / 2, 80));
858 }
859 
860 /* XXX Stub till we decide what to do. */
861 static int
862 view_split_begin_y(int lines)
863 {
864 	return lines * HSPLIT_SCALE;
865 }
866 
867 static const struct got_error *view_resize(struct tog_view *);
868 
869 static const struct got_error *
870 view_splitscreen(struct tog_view *view)
871 {
872 	const struct got_error *err = NULL;
873 
874 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
875 		if (view->resized_y && view->resized_y < view->lines)
876 			view->begin_y = view->resized_y;
877 		else
878 			view->begin_y = view_split_begin_y(view->nlines);
879 		view->begin_x = 0;
880 	} else if (!view->resized) {
881 		if (view->resized_x && view->resized_x < view->cols - 1 &&
882 		    view->cols > 119)
883 			view->begin_x = view->resized_x;
884 		else
885 			view->begin_x = view_split_begin_x(0);
886 		view->begin_y = 0;
887 	}
888 	view->nlines = LINES - view->begin_y;
889 	view->ncols = COLS - view->begin_x;
890 	view->lines = LINES;
891 	view->cols = COLS;
892 	err = view_resize(view);
893 	if (err)
894 		return err;
895 
896 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
897 		view->parent->nlines = view->begin_y;
898 
899 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
900 		return got_error_from_errno("mvwin");
901 
902 	return NULL;
903 }
904 
905 static const struct got_error *
906 view_fullscreen(struct tog_view *view)
907 {
908 	const struct got_error *err = NULL;
909 
910 	view->begin_x = 0;
911 	view->begin_y = view->resized ? view->begin_y : 0;
912 	view->nlines = view->resized ? view->nlines : LINES;
913 	view->ncols = COLS;
914 	view->lines = LINES;
915 	view->cols = COLS;
916 	err = view_resize(view);
917 	if (err)
918 		return err;
919 
920 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
921 		return got_error_from_errno("mvwin");
922 
923 	return NULL;
924 }
925 
926 static int
927 view_is_parent_view(struct tog_view *view)
928 {
929 	return view->parent == NULL;
930 }
931 
932 static int
933 view_is_splitscreen(struct tog_view *view)
934 {
935 	return view->begin_x > 0 || view->begin_y > 0;
936 }
937 
938 static int
939 view_is_fullscreen(struct tog_view *view)
940 {
941 	return view->nlines == LINES && view->ncols == COLS;
942 }
943 
944 static int
945 view_is_hsplit_top(struct tog_view *view)
946 {
947 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
948 	    view_is_splitscreen(view->child);
949 }
950 
951 static void
952 view_border(struct tog_view *view)
953 {
954 	PANEL *panel;
955 	const struct tog_view *view_above;
956 
957 	if (view->parent)
958 		return view_border(view->parent);
959 
960 	panel = panel_above(view->panel);
961 	if (panel == NULL)
962 		return;
963 
964 	view_above = panel_userptr(panel);
965 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
966 		mvwhline(view->window, view_above->begin_y - 1,
967 		    view->begin_x, got_locale_is_utf8() ?
968 		    ACS_HLINE : '-', view->ncols);
969 	else
970 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
971 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
972 }
973 
974 static const struct got_error *view_init_hsplit(struct tog_view *, int);
975 static const struct got_error *request_log_commits(struct tog_view *);
976 static const struct got_error *offset_selection_down(struct tog_view *);
977 static void offset_selection_up(struct tog_view *);
978 static void view_get_split(struct tog_view *, int *, int *);
979 
980 static const struct got_error *
981 view_resize(struct tog_view *view)
982 {
983 	const struct got_error	*err = NULL;
984 	int			 dif, nlines, ncols;
985 
986 	dif = LINES - view->lines;  /* line difference */
987 
988 	if (view->lines > LINES)
989 		nlines = view->nlines - (view->lines - LINES);
990 	else
991 		nlines = view->nlines + (LINES - view->lines);
992 	if (view->cols > COLS)
993 		ncols = view->ncols - (view->cols - COLS);
994 	else
995 		ncols = view->ncols + (COLS - view->cols);
996 
997 	if (view->child) {
998 		int hs = view->child->begin_y;
999 
1000 		if (!view_is_fullscreen(view))
1001 			view->child->begin_x = view_split_begin_x(view->begin_x);
1002 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1003 		    view->child->begin_x == 0) {
1004 			ncols = COLS;
1005 
1006 			view_fullscreen(view->child);
1007 			if (view->child->focussed)
1008 				show_panel(view->child->panel);
1009 			else
1010 				show_panel(view->panel);
1011 		} else {
1012 			ncols = view->child->begin_x;
1013 
1014 			view_splitscreen(view->child);
1015 			show_panel(view->child->panel);
1016 		}
1017 		/*
1018 		 * XXX This is ugly and needs to be moved into the above
1019 		 * logic but "works" for now and my attempts at moving it
1020 		 * break either 'tab' or 'F' key maps in horizontal splits.
1021 		 */
1022 		if (hs) {
1023 			err = view_splitscreen(view->child);
1024 			if (err)
1025 				return err;
1026 			if (dif < 0) { /* top split decreased */
1027 				err = offset_selection_down(view);
1028 				if (err)
1029 					return err;
1030 			}
1031 			view_border(view);
1032 			update_panels();
1033 			doupdate();
1034 			show_panel(view->child->panel);
1035 			nlines = view->nlines;
1036 		}
1037 	} else if (view->parent == NULL)
1038 		ncols = COLS;
1039 
1040 	if (view->resize && dif > 0) {
1041 		err = view->resize(view, dif);
1042 		if (err)
1043 			return err;
1044 	}
1045 
1046 	if (wresize(view->window, nlines, ncols) == ERR)
1047 		return got_error_from_errno("wresize");
1048 	if (replace_panel(view->panel, view->window) == ERR)
1049 		return got_error_from_errno("replace_panel");
1050 	wclear(view->window);
1051 
1052 	view->nlines = nlines;
1053 	view->ncols = ncols;
1054 	view->lines = LINES;
1055 	view->cols = COLS;
1056 
1057 	return NULL;
1058 }
1059 
1060 static const struct got_error *
1061 resize_log_view(struct tog_view *view, int increase)
1062 {
1063 	struct tog_log_view_state	*s = &view->state.log;
1064 	const struct got_error		*err = NULL;
1065 	int				 n = 0;
1066 
1067 	if (s->selected_entry)
1068 		n = s->selected_entry->idx + view->lines - s->selected;
1069 
1070 	/*
1071 	 * Request commits to account for the increased
1072 	 * height so we have enough to populate the view.
1073 	 */
1074 	if (s->commits->ncommits < n) {
1075 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1076 		err = request_log_commits(view);
1077 	}
1078 
1079 	return err;
1080 }
1081 
1082 static void
1083 view_adjust_offset(struct tog_view *view, int n)
1084 {
1085 	if (n == 0)
1086 		return;
1087 
1088 	if (view->parent && view->parent->offset) {
1089 		if (view->parent->offset + n >= 0)
1090 			view->parent->offset += n;
1091 		else
1092 			view->parent->offset = 0;
1093 	} else if (view->offset) {
1094 		if (view->offset - n >= 0)
1095 			view->offset -= n;
1096 		else
1097 			view->offset = 0;
1098 	}
1099 }
1100 
1101 static const struct got_error *
1102 view_resize_split(struct tog_view *view, int resize)
1103 {
1104 	const struct got_error	*err = NULL;
1105 	struct tog_view		*v = NULL;
1106 
1107 	if (view->parent)
1108 		v = view->parent;
1109 	else
1110 		v = view;
1111 
1112 	if (!v->child || !view_is_splitscreen(v->child))
1113 		return NULL;
1114 
1115 	v->resized = v->child->resized = resize;  /* lock for resize event */
1116 
1117 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1118 		if (v->child->resized_y)
1119 			v->child->begin_y = v->child->resized_y;
1120 		if (view->parent)
1121 			v->child->begin_y -= resize;
1122 		else
1123 			v->child->begin_y += resize;
1124 		if (v->child->begin_y < 3) {
1125 			view->count = 0;
1126 			v->child->begin_y = 3;
1127 		} else if (v->child->begin_y > LINES - 1) {
1128 			view->count = 0;
1129 			v->child->begin_y = LINES - 1;
1130 		}
1131 		v->ncols = COLS;
1132 		v->child->ncols = COLS;
1133 		view_adjust_offset(view, resize);
1134 		err = view_init_hsplit(v, v->child->begin_y);
1135 		if (err)
1136 			return err;
1137 		v->child->resized_y = v->child->begin_y;
1138 	} else {
1139 		if (v->child->resized_x)
1140 			v->child->begin_x = v->child->resized_x;
1141 		if (view->parent)
1142 			v->child->begin_x -= resize;
1143 		else
1144 			v->child->begin_x += resize;
1145 		if (v->child->begin_x < 11) {
1146 			view->count = 0;
1147 			v->child->begin_x = 11;
1148 		} else if (v->child->begin_x > COLS - 1) {
1149 			view->count = 0;
1150 			v->child->begin_x = COLS - 1;
1151 		}
1152 		v->child->resized_x = v->child->begin_x;
1153 	}
1154 
1155 	v->child->mode = v->mode;
1156 	v->child->nlines = v->lines - v->child->begin_y;
1157 	v->child->ncols = v->cols - v->child->begin_x;
1158 	v->focus_child = 1;
1159 
1160 	err = view_fullscreen(v);
1161 	if (err)
1162 		return err;
1163 	err = view_splitscreen(v->child);
1164 	if (err)
1165 		return err;
1166 
1167 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1168 		err = offset_selection_down(v->child);
1169 		if (err)
1170 			return err;
1171 	}
1172 
1173 	if (v->resize)
1174 		err = v->resize(v, 0);
1175 	else if (v->child->resize)
1176 		err = v->child->resize(v->child, 0);
1177 
1178 	v->resized = v->child->resized = 0;
1179 
1180 	return err;
1181 }
1182 
1183 static void
1184 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1185 {
1186 	struct tog_view *v = src->child ? src->child : src;
1187 
1188 	dst->resized_x = v->resized_x;
1189 	dst->resized_y = v->resized_y;
1190 }
1191 
1192 static const struct got_error *
1193 view_close_child(struct tog_view *view)
1194 {
1195 	const struct got_error *err = NULL;
1196 
1197 	if (view->child == NULL)
1198 		return NULL;
1199 
1200 	err = view_close(view->child);
1201 	view->child = NULL;
1202 	return err;
1203 }
1204 
1205 static const struct got_error *
1206 view_set_child(struct tog_view *view, struct tog_view *child)
1207 {
1208 	const struct got_error *err = NULL;
1209 
1210 	view->child = child;
1211 	child->parent = view;
1212 
1213 	err = view_resize(view);
1214 	if (err)
1215 		return err;
1216 
1217 	if (view->child->resized_x || view->child->resized_y)
1218 		err = view_resize_split(view, 0);
1219 
1220 	return err;
1221 }
1222 
1223 static const struct got_error *view_dispatch_request(struct tog_view **,
1224     struct tog_view *, enum tog_view_type, int, int);
1225 
1226 static const struct got_error *
1227 view_request_new(struct tog_view **requested, struct tog_view *view,
1228     enum tog_view_type request)
1229 {
1230 	struct tog_view		*new_view = NULL;
1231 	const struct got_error	*err;
1232 	int			 y = 0, x = 0;
1233 
1234 	*requested = NULL;
1235 
1236 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1237 		view_get_split(view, &y, &x);
1238 
1239 	err = view_dispatch_request(&new_view, view, request, y, x);
1240 	if (err)
1241 		return err;
1242 
1243 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1244 	    request != TOG_VIEW_HELP) {
1245 		err = view_init_hsplit(view, y);
1246 		if (err)
1247 			return err;
1248 	}
1249 
1250 	view->focussed = 0;
1251 	new_view->focussed = 1;
1252 	new_view->mode = view->mode;
1253 	new_view->nlines = request == TOG_VIEW_HELP ?
1254 	    view->lines : view->lines - y;
1255 
1256 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1257 		view_transfer_size(new_view, view);
1258 		err = view_close_child(view);
1259 		if (err)
1260 			return err;
1261 		err = view_set_child(view, new_view);
1262 		if (err)
1263 			return err;
1264 		view->focus_child = 1;
1265 	} else
1266 		*requested = new_view;
1267 
1268 	return NULL;
1269 }
1270 
1271 static void
1272 tog_resizeterm(void)
1273 {
1274 	int cols, lines;
1275 	struct winsize size;
1276 
1277 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1278 		cols = 80;     /* Default */
1279 		lines = 24;
1280 	} else {
1281 		cols = size.ws_col;
1282 		lines = size.ws_row;
1283 	}
1284 	resize_term(lines, cols);
1285 }
1286 
1287 static const struct got_error *
1288 view_search_start(struct tog_view *view)
1289 {
1290 	const struct got_error *err = NULL;
1291 	struct tog_view *v = view;
1292 	char pattern[1024];
1293 	int ret;
1294 
1295 	if (view->search_started) {
1296 		regfree(&view->regex);
1297 		view->searching = 0;
1298 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1299 	}
1300 	view->search_started = 0;
1301 
1302 	if (view->nlines < 1)
1303 		return NULL;
1304 
1305 	if (view_is_hsplit_top(view))
1306 		v = view->child;
1307 
1308 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1309 	wclrtoeol(v->window);
1310 
1311 	nodelay(view->window, FALSE);  /* block for search term input */
1312 	nocbreak();
1313 	echo();
1314 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1315 	wrefresh(v->window);
1316 	cbreak();
1317 	noecho();
1318 	nodelay(view->window, TRUE);
1319 	if (ret == ERR)
1320 		return NULL;
1321 
1322 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1323 		err = view->search_start(view);
1324 		if (err) {
1325 			regfree(&view->regex);
1326 			return err;
1327 		}
1328 		view->search_started = 1;
1329 		view->searching = TOG_SEARCH_FORWARD;
1330 		view->search_next_done = 0;
1331 		view->search_next(view);
1332 	}
1333 
1334 	return NULL;
1335 }
1336 
1337 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1338 static const struct got_error *
1339 switch_split(struct tog_view *view)
1340 {
1341 	const struct got_error	*err = NULL;
1342 	struct tog_view		*v = NULL;
1343 
1344 	if (view->parent)
1345 		v = view->parent;
1346 	else
1347 		v = view;
1348 
1349 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1350 		v->mode = TOG_VIEW_SPLIT_VERT;
1351 	else
1352 		v->mode = TOG_VIEW_SPLIT_HRZN;
1353 
1354 	if (!v->child)
1355 		return NULL;
1356 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1357 		v->mode = TOG_VIEW_SPLIT_NONE;
1358 
1359 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1360 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1361 		v->child->begin_y = v->child->resized_y;
1362 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1363 		v->child->begin_x = v->child->resized_x;
1364 
1365 
1366 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1367 		v->ncols = COLS;
1368 		v->child->ncols = COLS;
1369 		v->child->nscrolled = LINES - v->child->nlines;
1370 
1371 		err = view_init_hsplit(v, v->child->begin_y);
1372 		if (err)
1373 			return err;
1374 	}
1375 	v->child->mode = v->mode;
1376 	v->child->nlines = v->lines - v->child->begin_y;
1377 	v->focus_child = 1;
1378 
1379 	err = view_fullscreen(v);
1380 	if (err)
1381 		return err;
1382 	err = view_splitscreen(v->child);
1383 	if (err)
1384 		return err;
1385 
1386 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1387 		v->mode = TOG_VIEW_SPLIT_VERT;
1388 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1389 		err = offset_selection_down(v);
1390 		if (err)
1391 			return err;
1392 		err = offset_selection_down(v->child);
1393 		if (err)
1394 			return err;
1395 	} else {
1396 		offset_selection_up(v);
1397 		offset_selection_up(v->child);
1398 	}
1399 	if (v->resize)
1400 		err = v->resize(v, 0);
1401 	else if (v->child->resize)
1402 		err = v->child->resize(v->child, 0);
1403 
1404 	return err;
1405 }
1406 
1407 /*
1408  * Compute view->count from numeric input. Assign total to view->count and
1409  * return first non-numeric key entered.
1410  */
1411 static int
1412 get_compound_key(struct tog_view *view, int c)
1413 {
1414 	struct tog_view	*v = view;
1415 	int		 x, n = 0;
1416 
1417 	if (view_is_hsplit_top(view))
1418 		v = view->child;
1419 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1420 		v = view->parent;
1421 
1422 	view->count = 0;
1423 	cbreak();  /* block for input */
1424 	nodelay(view->window, FALSE);
1425 	wmove(v->window, v->nlines - 1, 0);
1426 	wclrtoeol(v->window);
1427 	waddch(v->window, ':');
1428 
1429 	do {
1430 		x = getcurx(v->window);
1431 		if (x != ERR && x < view->ncols) {
1432 			waddch(v->window, c);
1433 			wrefresh(v->window);
1434 		}
1435 
1436 		/*
1437 		 * Don't overflow. Max valid request should be the greatest
1438 		 * between the longest and total lines; cap at 10 million.
1439 		 */
1440 		if (n >= 9999999)
1441 			n = 9999999;
1442 		else
1443 			n = n * 10 + (c - '0');
1444 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1445 
1446 	if (c == 'G' || c == 'g') {	/* nG key map */
1447 		view->gline = view->hiline = n;
1448 		n = 0;
1449 		c = 0;
1450 	}
1451 
1452 	/* Massage excessive or inapplicable values at the input handler. */
1453 	view->count = n;
1454 
1455 	return c;
1456 }
1457 
1458 static const struct got_error *
1459 view_input(struct tog_view **new, int *done, struct tog_view *view,
1460     struct tog_view_list_head *views)
1461 {
1462 	const struct got_error *err = NULL;
1463 	struct tog_view *v;
1464 	int ch, errcode;
1465 
1466 	*new = NULL;
1467 
1468 	/* Clear "no matches" indicator. */
1469 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1470 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1471 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1472 		view->count = 0;
1473 	}
1474 
1475 	if (view->searching && !view->search_next_done) {
1476 		errcode = pthread_mutex_unlock(&tog_mutex);
1477 		if (errcode)
1478 			return got_error_set_errno(errcode,
1479 			    "pthread_mutex_unlock");
1480 		sched_yield();
1481 		errcode = pthread_mutex_lock(&tog_mutex);
1482 		if (errcode)
1483 			return got_error_set_errno(errcode,
1484 			    "pthread_mutex_lock");
1485 		view->search_next(view);
1486 		return NULL;
1487 	}
1488 
1489 	/* Allow threads to make progress while we are waiting for input. */
1490 	errcode = pthread_mutex_unlock(&tog_mutex);
1491 	if (errcode)
1492 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1493 	/* If we have an unfinished count, let C-g or backspace abort. */
1494 	if (view->count && --view->count) {
1495 		cbreak();
1496 		nodelay(view->window, TRUE);
1497 		ch = wgetch(view->window);
1498 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1499 			view->count = 0;
1500 		else
1501 			ch = view->ch;
1502 	} else {
1503 		ch = wgetch(view->window);
1504 		if (ch >= '1' && ch  <= '9')
1505 			view->ch = ch = get_compound_key(view, ch);
1506 	}
1507 	if (view->hiline && ch != ERR && ch != 0)
1508 		view->hiline = 0;  /* key pressed, clear line highlight */
1509 	nodelay(view->window, TRUE);
1510 	errcode = pthread_mutex_lock(&tog_mutex);
1511 	if (errcode)
1512 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1513 
1514 	if (tog_sigwinch_received || tog_sigcont_received) {
1515 		tog_resizeterm();
1516 		tog_sigwinch_received = 0;
1517 		tog_sigcont_received = 0;
1518 		TAILQ_FOREACH(v, views, entry) {
1519 			err = view_resize(v);
1520 			if (err)
1521 				return err;
1522 			err = v->input(new, v, KEY_RESIZE);
1523 			if (err)
1524 				return err;
1525 			if (v->child) {
1526 				err = view_resize(v->child);
1527 				if (err)
1528 					return err;
1529 				err = v->child->input(new, v->child,
1530 				    KEY_RESIZE);
1531 				if (err)
1532 					return err;
1533 				if (v->child->resized_x || v->child->resized_y) {
1534 					err = view_resize_split(v, 0);
1535 					if (err)
1536 						return err;
1537 				}
1538 			}
1539 		}
1540 	}
1541 
1542 	switch (ch) {
1543 	case '?':
1544 	case 'H':
1545 	case KEY_F(1):
1546 		if (view->type == TOG_VIEW_HELP)
1547 			err = view->reset(view);
1548 		else
1549 			err = view_request_new(new, view, TOG_VIEW_HELP);
1550 		break;
1551 	case '\t':
1552 		view->count = 0;
1553 		if (view->child) {
1554 			view->focussed = 0;
1555 			view->child->focussed = 1;
1556 			view->focus_child = 1;
1557 		} else if (view->parent) {
1558 			view->focussed = 0;
1559 			view->parent->focussed = 1;
1560 			view->parent->focus_child = 0;
1561 			if (!view_is_splitscreen(view)) {
1562 				if (view->parent->resize) {
1563 					err = view->parent->resize(view->parent,
1564 					    0);
1565 					if (err)
1566 						return err;
1567 				}
1568 				offset_selection_up(view->parent);
1569 				err = view_fullscreen(view->parent);
1570 				if (err)
1571 					return err;
1572 			}
1573 		}
1574 		break;
1575 	case 'q':
1576 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1577 			if (view->parent->resize) {
1578 				/* might need more commits to fill fullscreen */
1579 				err = view->parent->resize(view->parent, 0);
1580 				if (err)
1581 					break;
1582 			}
1583 			offset_selection_up(view->parent);
1584 		}
1585 		err = view->input(new, view, ch);
1586 		view->dying = 1;
1587 		break;
1588 	case 'Q':
1589 		*done = 1;
1590 		break;
1591 	case 'F':
1592 		view->count = 0;
1593 		if (view_is_parent_view(view)) {
1594 			if (view->child == NULL)
1595 				break;
1596 			if (view_is_splitscreen(view->child)) {
1597 				view->focussed = 0;
1598 				view->child->focussed = 1;
1599 				err = view_fullscreen(view->child);
1600 			} else {
1601 				err = view_splitscreen(view->child);
1602 				if (!err)
1603 					err = view_resize_split(view, 0);
1604 			}
1605 			if (err)
1606 				break;
1607 			err = view->child->input(new, view->child,
1608 			    KEY_RESIZE);
1609 		} else {
1610 			if (view_is_splitscreen(view)) {
1611 				view->parent->focussed = 0;
1612 				view->focussed = 1;
1613 				err = view_fullscreen(view);
1614 			} else {
1615 				err = view_splitscreen(view);
1616 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1617 					err = view_resize(view->parent);
1618 				if (!err)
1619 					err = view_resize_split(view, 0);
1620 			}
1621 			if (err)
1622 				break;
1623 			err = view->input(new, view, KEY_RESIZE);
1624 		}
1625 		if (err)
1626 			break;
1627 		if (view->resize) {
1628 			err = view->resize(view, 0);
1629 			if (err)
1630 				break;
1631 		}
1632 		if (view->parent)
1633 			err = offset_selection_down(view->parent);
1634 		if (!err)
1635 			err = offset_selection_down(view);
1636 		break;
1637 	case 'S':
1638 		view->count = 0;
1639 		err = switch_split(view);
1640 		break;
1641 	case '-':
1642 		err = view_resize_split(view, -1);
1643 		break;
1644 	case '+':
1645 		err = view_resize_split(view, 1);
1646 		break;
1647 	case KEY_RESIZE:
1648 		break;
1649 	case '/':
1650 		view->count = 0;
1651 		if (view->search_start)
1652 			view_search_start(view);
1653 		else
1654 			err = view->input(new, view, ch);
1655 		break;
1656 	case 'N':
1657 	case 'n':
1658 		if (view->search_started && view->search_next) {
1659 			view->searching = (ch == 'n' ?
1660 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1661 			view->search_next_done = 0;
1662 			view->search_next(view);
1663 		} else
1664 			err = view->input(new, view, ch);
1665 		break;
1666 	case 'A':
1667 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1668 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1669 		else
1670 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1671 		TAILQ_FOREACH(v, views, entry) {
1672 			if (v->reset) {
1673 				err = v->reset(v);
1674 				if (err)
1675 					return err;
1676 			}
1677 			if (v->child && v->child->reset) {
1678 				err = v->child->reset(v->child);
1679 				if (err)
1680 					return err;
1681 			}
1682 		}
1683 		break;
1684 	default:
1685 		err = view->input(new, view, ch);
1686 		break;
1687 	}
1688 
1689 	return err;
1690 }
1691 
1692 static int
1693 view_needs_focus_indication(struct tog_view *view)
1694 {
1695 	if (view_is_parent_view(view)) {
1696 		if (view->child == NULL || view->child->focussed)
1697 			return 0;
1698 		if (!view_is_splitscreen(view->child))
1699 			return 0;
1700 	} else if (!view_is_splitscreen(view))
1701 		return 0;
1702 
1703 	return view->focussed;
1704 }
1705 
1706 static const struct got_error *
1707 view_loop(struct tog_view *view)
1708 {
1709 	const struct got_error *err = NULL;
1710 	struct tog_view_list_head views;
1711 	struct tog_view *new_view;
1712 	char *mode;
1713 	int fast_refresh = 10;
1714 	int done = 0, errcode;
1715 
1716 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1717 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1718 		view->mode = TOG_VIEW_SPLIT_VERT;
1719 	else
1720 		view->mode = TOG_VIEW_SPLIT_HRZN;
1721 
1722 	errcode = pthread_mutex_lock(&tog_mutex);
1723 	if (errcode)
1724 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1725 
1726 	TAILQ_INIT(&views);
1727 	TAILQ_INSERT_HEAD(&views, view, entry);
1728 
1729 	view->focussed = 1;
1730 	err = view->show(view);
1731 	if (err)
1732 		return err;
1733 	update_panels();
1734 	doupdate();
1735 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1736 	    !tog_fatal_signal_received()) {
1737 		/* Refresh fast during initialization, then become slower. */
1738 		if (fast_refresh && fast_refresh-- == 0)
1739 			halfdelay(10); /* switch to once per second */
1740 
1741 		err = view_input(&new_view, &done, view, &views);
1742 		if (err)
1743 			break;
1744 		if (view->dying) {
1745 			struct tog_view *v, *prev = NULL;
1746 
1747 			if (view_is_parent_view(view))
1748 				prev = TAILQ_PREV(view, tog_view_list_head,
1749 				    entry);
1750 			else if (view->parent)
1751 				prev = view->parent;
1752 
1753 			if (view->parent) {
1754 				view->parent->child = NULL;
1755 				view->parent->focus_child = 0;
1756 				/* Restore fullscreen line height. */
1757 				view->parent->nlines = view->parent->lines;
1758 				err = view_resize(view->parent);
1759 				if (err)
1760 					break;
1761 				/* Make resized splits persist. */
1762 				view_transfer_size(view->parent, view);
1763 			} else
1764 				TAILQ_REMOVE(&views, view, entry);
1765 
1766 			err = view_close(view);
1767 			if (err)
1768 				goto done;
1769 
1770 			view = NULL;
1771 			TAILQ_FOREACH(v, &views, entry) {
1772 				if (v->focussed)
1773 					break;
1774 			}
1775 			if (view == NULL && new_view == NULL) {
1776 				/* No view has focus. Try to pick one. */
1777 				if (prev)
1778 					view = prev;
1779 				else if (!TAILQ_EMPTY(&views)) {
1780 					view = TAILQ_LAST(&views,
1781 					    tog_view_list_head);
1782 				}
1783 				if (view) {
1784 					if (view->focus_child) {
1785 						view->child->focussed = 1;
1786 						view = view->child;
1787 					} else
1788 						view->focussed = 1;
1789 				}
1790 			}
1791 		}
1792 		if (new_view) {
1793 			struct tog_view *v, *t;
1794 			/* Only allow one parent view per type. */
1795 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1796 				if (v->type != new_view->type)
1797 					continue;
1798 				TAILQ_REMOVE(&views, v, entry);
1799 				err = view_close(v);
1800 				if (err)
1801 					goto done;
1802 				break;
1803 			}
1804 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1805 			view = new_view;
1806 		}
1807 		if (view) {
1808 			if (view_is_parent_view(view)) {
1809 				if (view->child && view->child->focussed)
1810 					view = view->child;
1811 			} else {
1812 				if (view->parent && view->parent->focussed)
1813 					view = view->parent;
1814 			}
1815 			show_panel(view->panel);
1816 			if (view->child && view_is_splitscreen(view->child))
1817 				show_panel(view->child->panel);
1818 			if (view->parent && view_is_splitscreen(view)) {
1819 				err = view->parent->show(view->parent);
1820 				if (err)
1821 					goto done;
1822 			}
1823 			err = view->show(view);
1824 			if (err)
1825 				goto done;
1826 			if (view->child) {
1827 				err = view->child->show(view->child);
1828 				if (err)
1829 					goto done;
1830 			}
1831 			update_panels();
1832 			doupdate();
1833 		}
1834 	}
1835 done:
1836 	while (!TAILQ_EMPTY(&views)) {
1837 		const struct got_error *close_err;
1838 		view = TAILQ_FIRST(&views);
1839 		TAILQ_REMOVE(&views, view, entry);
1840 		close_err = view_close(view);
1841 		if (close_err && err == NULL)
1842 			err = close_err;
1843 	}
1844 
1845 	errcode = pthread_mutex_unlock(&tog_mutex);
1846 	if (errcode && err == NULL)
1847 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1848 
1849 	return err;
1850 }
1851 
1852 __dead static void
1853 usage_log(void)
1854 {
1855 	endwin();
1856 	fprintf(stderr,
1857 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1858 	    getprogname());
1859 	exit(1);
1860 }
1861 
1862 /* Create newly allocated wide-character string equivalent to a byte string. */
1863 static const struct got_error *
1864 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1865 {
1866 	char *vis = NULL;
1867 	const struct got_error *err = NULL;
1868 
1869 	*ws = NULL;
1870 	*wlen = mbstowcs(NULL, s, 0);
1871 	if (*wlen == (size_t)-1) {
1872 		int vislen;
1873 		if (errno != EILSEQ)
1874 			return got_error_from_errno("mbstowcs");
1875 
1876 		/* byte string invalid in current encoding; try to "fix" it */
1877 		err = got_mbsavis(&vis, &vislen, s);
1878 		if (err)
1879 			return err;
1880 		*wlen = mbstowcs(NULL, vis, 0);
1881 		if (*wlen == (size_t)-1) {
1882 			err = got_error_from_errno("mbstowcs"); /* give up */
1883 			goto done;
1884 		}
1885 	}
1886 
1887 	*ws = calloc(*wlen + 1, sizeof(**ws));
1888 	if (*ws == NULL) {
1889 		err = got_error_from_errno("calloc");
1890 		goto done;
1891 	}
1892 
1893 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1894 		err = got_error_from_errno("mbstowcs");
1895 done:
1896 	free(vis);
1897 	if (err) {
1898 		free(*ws);
1899 		*ws = NULL;
1900 		*wlen = 0;
1901 	}
1902 	return err;
1903 }
1904 
1905 static const struct got_error *
1906 expand_tab(char **ptr, const char *src)
1907 {
1908 	char	*dst;
1909 	size_t	 len, n, idx = 0, sz = 0;
1910 
1911 	*ptr = NULL;
1912 	n = len = strlen(src);
1913 	dst = malloc(n + 1);
1914 	if (dst == NULL)
1915 		return got_error_from_errno("malloc");
1916 
1917 	while (idx < len && src[idx]) {
1918 		const char c = src[idx];
1919 
1920 		if (c == '\t') {
1921 			size_t nb = TABSIZE - sz % TABSIZE;
1922 			char *p;
1923 
1924 			p = realloc(dst, n + nb);
1925 			if (p == NULL) {
1926 				free(dst);
1927 				return got_error_from_errno("realloc");
1928 
1929 			}
1930 			dst = p;
1931 			n += nb;
1932 			memset(dst + sz, ' ', nb);
1933 			sz += nb;
1934 		} else
1935 			dst[sz++] = src[idx];
1936 		++idx;
1937 	}
1938 
1939 	dst[sz] = '\0';
1940 	*ptr = dst;
1941 	return NULL;
1942 }
1943 
1944 /*
1945  * Advance at most n columns from wline starting at offset off.
1946  * Return the index to the first character after the span operation.
1947  * Return the combined column width of all spanned wide character in
1948  * *rcol.
1949  */
1950 static int
1951 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1952 {
1953 	int width, i, cols = 0;
1954 
1955 	if (n == 0) {
1956 		*rcol = cols;
1957 		return off;
1958 	}
1959 
1960 	for (i = off; wline[i] != L'\0'; ++i) {
1961 		if (wline[i] == L'\t')
1962 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1963 		else
1964 			width = wcwidth(wline[i]);
1965 
1966 		if (width == -1) {
1967 			width = 1;
1968 			wline[i] = L'.';
1969 		}
1970 
1971 		if (cols + width > n)
1972 			break;
1973 		cols += width;
1974 	}
1975 
1976 	*rcol = cols;
1977 	return i;
1978 }
1979 
1980 /*
1981  * Format a line for display, ensuring that it won't overflow a width limit.
1982  * With scrolling, the width returned refers to the scrolled version of the
1983  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1984  */
1985 static const struct got_error *
1986 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1987     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1988 {
1989 	const struct got_error *err = NULL;
1990 	int cols;
1991 	wchar_t *wline = NULL;
1992 	char *exstr = NULL;
1993 	size_t wlen;
1994 	int i, scrollx;
1995 
1996 	*wlinep = NULL;
1997 	*widthp = 0;
1998 
1999 	if (expand) {
2000 		err = expand_tab(&exstr, line);
2001 		if (err)
2002 			return err;
2003 	}
2004 
2005 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2006 	free(exstr);
2007 	if (err)
2008 		return err;
2009 
2010 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2011 
2012 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2013 		wline[wlen - 1] = L'\0';
2014 		wlen--;
2015 	}
2016 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2017 		wline[wlen - 1] = L'\0';
2018 		wlen--;
2019 	}
2020 
2021 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2022 	wline[i] = L'\0';
2023 
2024 	if (widthp)
2025 		*widthp = cols;
2026 	if (scrollxp)
2027 		*scrollxp = scrollx;
2028 	if (err)
2029 		free(wline);
2030 	else
2031 		*wlinep = wline;
2032 	return err;
2033 }
2034 
2035 static const struct got_error*
2036 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2037     struct got_object_id *id, struct got_repository *repo)
2038 {
2039 	static const struct got_error *err = NULL;
2040 	struct got_reflist_entry *re;
2041 	char *s;
2042 	const char *name;
2043 
2044 	*refs_str = NULL;
2045 
2046 	TAILQ_FOREACH(re, refs, entry) {
2047 		struct got_tag_object *tag = NULL;
2048 		struct got_object_id *ref_id;
2049 		int cmp;
2050 
2051 		name = got_ref_get_name(re->ref);
2052 		if (strcmp(name, GOT_REF_HEAD) == 0)
2053 			continue;
2054 		if (strncmp(name, "refs/", 5) == 0)
2055 			name += 5;
2056 		if (strncmp(name, "got/", 4) == 0 &&
2057 		    strncmp(name, "got/backup/", 11) != 0)
2058 			continue;
2059 		if (strncmp(name, "heads/", 6) == 0)
2060 			name += 6;
2061 		if (strncmp(name, "remotes/", 8) == 0) {
2062 			name += 8;
2063 			s = strstr(name, "/" GOT_REF_HEAD);
2064 			if (s != NULL && s[strlen(s)] == '\0')
2065 				continue;
2066 		}
2067 		err = got_ref_resolve(&ref_id, repo, re->ref);
2068 		if (err)
2069 			break;
2070 		if (strncmp(name, "tags/", 5) == 0) {
2071 			err = got_object_open_as_tag(&tag, repo, ref_id);
2072 			if (err) {
2073 				if (err->code != GOT_ERR_OBJ_TYPE) {
2074 					free(ref_id);
2075 					break;
2076 				}
2077 				/* Ref points at something other than a tag. */
2078 				err = NULL;
2079 				tag = NULL;
2080 			}
2081 		}
2082 		cmp = got_object_id_cmp(tag ?
2083 		    got_object_tag_get_object_id(tag) : ref_id, id);
2084 		free(ref_id);
2085 		if (tag)
2086 			got_object_tag_close(tag);
2087 		if (cmp != 0)
2088 			continue;
2089 		s = *refs_str;
2090 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2091 		    s ? ", " : "", name) == -1) {
2092 			err = got_error_from_errno("asprintf");
2093 			free(s);
2094 			*refs_str = NULL;
2095 			break;
2096 		}
2097 		free(s);
2098 	}
2099 
2100 	return err;
2101 }
2102 
2103 static const struct got_error *
2104 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2105     int col_tab_align)
2106 {
2107 	char *smallerthan;
2108 
2109 	smallerthan = strchr(author, '<');
2110 	if (smallerthan && smallerthan[1] != '\0')
2111 		author = smallerthan + 1;
2112 	author[strcspn(author, "@>")] = '\0';
2113 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2114 	    col_tab_align, 0);
2115 }
2116 
2117 static const struct got_error *
2118 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2119     struct got_object_id *id, const size_t date_display_cols,
2120     int author_display_cols)
2121 {
2122 	struct tog_log_view_state *s = &view->state.log;
2123 	const struct got_error *err = NULL;
2124 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2125 	char *logmsg0 = NULL, *logmsg = NULL;
2126 	char *author = NULL;
2127 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2128 	int author_width, logmsg_width;
2129 	char *newline, *line = NULL;
2130 	int col, limit, scrollx;
2131 	const int avail = view->ncols;
2132 	struct tm tm;
2133 	time_t committer_time;
2134 	struct tog_color *tc;
2135 
2136 	committer_time = got_object_commit_get_committer_time(commit);
2137 	if (gmtime_r(&committer_time, &tm) == NULL)
2138 		return got_error_from_errno("gmtime_r");
2139 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2140 		return got_error(GOT_ERR_NO_SPACE);
2141 
2142 	if (avail <= date_display_cols)
2143 		limit = MIN(sizeof(datebuf) - 1, avail);
2144 	else
2145 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2146 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2147 	if (tc)
2148 		wattr_on(view->window,
2149 		    COLOR_PAIR(tc->colorpair), NULL);
2150 	waddnstr(view->window, datebuf, limit);
2151 	if (tc)
2152 		wattr_off(view->window,
2153 		    COLOR_PAIR(tc->colorpair), NULL);
2154 	col = limit;
2155 	if (col > avail)
2156 		goto done;
2157 
2158 	if (avail >= 120) {
2159 		char *id_str;
2160 		err = got_object_id_str(&id_str, id);
2161 		if (err)
2162 			goto done;
2163 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2164 		if (tc)
2165 			wattr_on(view->window,
2166 			    COLOR_PAIR(tc->colorpair), NULL);
2167 		wprintw(view->window, "%.8s ", id_str);
2168 		if (tc)
2169 			wattr_off(view->window,
2170 			    COLOR_PAIR(tc->colorpair), NULL);
2171 		free(id_str);
2172 		col += 9;
2173 		if (col > avail)
2174 			goto done;
2175 	}
2176 
2177 	if (s->use_committer)
2178 		author = strdup(got_object_commit_get_committer(commit));
2179 	else
2180 		author = strdup(got_object_commit_get_author(commit));
2181 	if (author == NULL) {
2182 		err = got_error_from_errno("strdup");
2183 		goto done;
2184 	}
2185 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2186 	if (err)
2187 		goto done;
2188 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2189 	if (tc)
2190 		wattr_on(view->window,
2191 		    COLOR_PAIR(tc->colorpair), NULL);
2192 	waddwstr(view->window, wauthor);
2193 	col += author_width;
2194 	while (col < avail && author_width < author_display_cols + 2) {
2195 		waddch(view->window, ' ');
2196 		col++;
2197 		author_width++;
2198 	}
2199 	if (tc)
2200 		wattr_off(view->window,
2201 		    COLOR_PAIR(tc->colorpair), NULL);
2202 	if (col > avail)
2203 		goto done;
2204 
2205 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2206 	if (err)
2207 		goto done;
2208 	logmsg = logmsg0;
2209 	while (*logmsg == '\n')
2210 		logmsg++;
2211 	newline = strchr(logmsg, '\n');
2212 	if (newline)
2213 		*newline = '\0';
2214 	limit = avail - col;
2215 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2216 		limit--;	/* for the border */
2217 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2218 	    limit, col, 1);
2219 	if (err)
2220 		goto done;
2221 	waddwstr(view->window, &wlogmsg[scrollx]);
2222 	col += MAX(logmsg_width, 0);
2223 	while (col < avail) {
2224 		waddch(view->window, ' ');
2225 		col++;
2226 	}
2227 done:
2228 	free(logmsg0);
2229 	free(wlogmsg);
2230 	free(author);
2231 	free(wauthor);
2232 	free(line);
2233 	return err;
2234 }
2235 
2236 static struct commit_queue_entry *
2237 alloc_commit_queue_entry(struct got_commit_object *commit,
2238     struct got_object_id *id)
2239 {
2240 	struct commit_queue_entry *entry;
2241 	struct got_object_id *dup;
2242 
2243 	entry = calloc(1, sizeof(*entry));
2244 	if (entry == NULL)
2245 		return NULL;
2246 
2247 	dup = got_object_id_dup(id);
2248 	if (dup == NULL) {
2249 		free(entry);
2250 		return NULL;
2251 	}
2252 
2253 	entry->id = dup;
2254 	entry->commit = commit;
2255 	return entry;
2256 }
2257 
2258 static void
2259 pop_commit(struct commit_queue *commits)
2260 {
2261 	struct commit_queue_entry *entry;
2262 
2263 	entry = TAILQ_FIRST(&commits->head);
2264 	TAILQ_REMOVE(&commits->head, entry, entry);
2265 	got_object_commit_close(entry->commit);
2266 	commits->ncommits--;
2267 	free(entry->id);
2268 	free(entry);
2269 }
2270 
2271 static void
2272 free_commits(struct commit_queue *commits)
2273 {
2274 	while (!TAILQ_EMPTY(&commits->head))
2275 		pop_commit(commits);
2276 }
2277 
2278 static const struct got_error *
2279 match_commit(int *have_match, struct got_object_id *id,
2280     struct got_commit_object *commit, regex_t *regex)
2281 {
2282 	const struct got_error *err = NULL;
2283 	regmatch_t regmatch;
2284 	char *id_str = NULL, *logmsg = NULL;
2285 
2286 	*have_match = 0;
2287 
2288 	err = got_object_id_str(&id_str, id);
2289 	if (err)
2290 		return err;
2291 
2292 	err = got_object_commit_get_logmsg(&logmsg, commit);
2293 	if (err)
2294 		goto done;
2295 
2296 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2297 	    &regmatch, 0) == 0 ||
2298 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2299 	    &regmatch, 0) == 0 ||
2300 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2301 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2302 		*have_match = 1;
2303 done:
2304 	free(id_str);
2305 	free(logmsg);
2306 	return err;
2307 }
2308 
2309 static const struct got_error *
2310 queue_commits(struct tog_log_thread_args *a)
2311 {
2312 	const struct got_error *err = NULL;
2313 
2314 	/*
2315 	 * We keep all commits open throughout the lifetime of the log
2316 	 * view in order to avoid having to re-fetch commits from disk
2317 	 * while updating the display.
2318 	 */
2319 	do {
2320 		struct got_object_id id;
2321 		struct got_commit_object *commit;
2322 		struct commit_queue_entry *entry;
2323 		int limit_match = 0;
2324 		int errcode;
2325 
2326 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2327 		    NULL, NULL);
2328 		if (err)
2329 			break;
2330 
2331 		err = got_object_open_as_commit(&commit, a->repo, &id);
2332 		if (err)
2333 			break;
2334 		entry = alloc_commit_queue_entry(commit, &id);
2335 		if (entry == NULL) {
2336 			err = got_error_from_errno("alloc_commit_queue_entry");
2337 			break;
2338 		}
2339 
2340 		errcode = pthread_mutex_lock(&tog_mutex);
2341 		if (errcode) {
2342 			err = got_error_set_errno(errcode,
2343 			    "pthread_mutex_lock");
2344 			break;
2345 		}
2346 
2347 		entry->idx = a->real_commits->ncommits;
2348 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2349 		a->real_commits->ncommits++;
2350 
2351 		if (*a->limiting) {
2352 			err = match_commit(&limit_match, &id, commit,
2353 			    a->limit_regex);
2354 			if (err)
2355 				break;
2356 
2357 			if (limit_match) {
2358 				struct commit_queue_entry *matched;
2359 
2360 				matched = alloc_commit_queue_entry(
2361 				    entry->commit, entry->id);
2362 				if (matched == NULL) {
2363 					err = got_error_from_errno(
2364 					    "alloc_commit_queue_entry");
2365 					break;
2366 				}
2367 				matched->commit = entry->commit;
2368 				got_object_commit_retain(entry->commit);
2369 
2370 				matched->idx = a->limit_commits->ncommits;
2371 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2372 				    matched, entry);
2373 				a->limit_commits->ncommits++;
2374 			}
2375 
2376 			/*
2377 			 * This is how we signal log_thread() that we
2378 			 * have found a match, and that it should be
2379 			 * counted as a new entry for the view.
2380 			 */
2381 			a->limit_match = limit_match;
2382 		}
2383 
2384 		if (*a->searching == TOG_SEARCH_FORWARD &&
2385 		    !*a->search_next_done) {
2386 			int have_match;
2387 			err = match_commit(&have_match, &id, commit, a->regex);
2388 			if (err)
2389 				break;
2390 
2391 			if (*a->limiting) {
2392 				if (limit_match && have_match)
2393 					*a->search_next_done =
2394 					    TOG_SEARCH_HAVE_MORE;
2395 			} else if (have_match)
2396 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2397 		}
2398 
2399 		errcode = pthread_mutex_unlock(&tog_mutex);
2400 		if (errcode && err == NULL)
2401 			err = got_error_set_errno(errcode,
2402 			    "pthread_mutex_unlock");
2403 		if (err)
2404 			break;
2405 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2406 
2407 	return err;
2408 }
2409 
2410 static void
2411 select_commit(struct tog_log_view_state *s)
2412 {
2413 	struct commit_queue_entry *entry;
2414 	int ncommits = 0;
2415 
2416 	entry = s->first_displayed_entry;
2417 	while (entry) {
2418 		if (ncommits == s->selected) {
2419 			s->selected_entry = entry;
2420 			break;
2421 		}
2422 		entry = TAILQ_NEXT(entry, entry);
2423 		ncommits++;
2424 	}
2425 }
2426 
2427 static const struct got_error *
2428 draw_commits(struct tog_view *view)
2429 {
2430 	const struct got_error *err = NULL;
2431 	struct tog_log_view_state *s = &view->state.log;
2432 	struct commit_queue_entry *entry = s->selected_entry;
2433 	int limit = view->nlines;
2434 	int width;
2435 	int ncommits, author_cols = 4;
2436 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2437 	char *refs_str = NULL;
2438 	wchar_t *wline;
2439 	struct tog_color *tc;
2440 	static const size_t date_display_cols = 12;
2441 
2442 	if (view_is_hsplit_top(view))
2443 		--limit;  /* account for border */
2444 
2445 	if (s->selected_entry &&
2446 	    !(view->searching && view->search_next_done == 0)) {
2447 		struct got_reflist_head *refs;
2448 		err = got_object_id_str(&id_str, s->selected_entry->id);
2449 		if (err)
2450 			return err;
2451 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2452 		    s->selected_entry->id);
2453 		if (refs) {
2454 			err = build_refs_str(&refs_str, refs,
2455 			    s->selected_entry->id, s->repo);
2456 			if (err)
2457 				goto done;
2458 		}
2459 	}
2460 
2461 	if (s->thread_args.commits_needed == 0)
2462 		halfdelay(10); /* disable fast refresh */
2463 
2464 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2465 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2466 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2467 		    (view->searching && !view->search_next_done) ?
2468 		    "searching..." : "loading...") == -1) {
2469 			err = got_error_from_errno("asprintf");
2470 			goto done;
2471 		}
2472 	} else {
2473 		const char *search_str = NULL;
2474 		const char *limit_str = NULL;
2475 
2476 		if (view->searching) {
2477 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2478 				search_str = "no more matches";
2479 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2480 				search_str = "no matches found";
2481 			else if (!view->search_next_done)
2482 				search_str = "searching...";
2483 		}
2484 
2485 		if (s->limit_view && s->commits->ncommits == 0)
2486 			limit_str = "no matches found";
2487 
2488 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2489 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2490 		    search_str ? search_str : (refs_str ? refs_str : ""),
2491 		    limit_str ? limit_str : "") == -1) {
2492 			err = got_error_from_errno("asprintf");
2493 			goto done;
2494 		}
2495 	}
2496 
2497 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2498 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2499 		    "........................................",
2500 		    s->in_repo_path, ncommits_str) == -1) {
2501 			err = got_error_from_errno("asprintf");
2502 			header = NULL;
2503 			goto done;
2504 		}
2505 	} else if (asprintf(&header, "commit %s%s",
2506 	    id_str ? id_str : "........................................",
2507 	    ncommits_str) == -1) {
2508 		err = got_error_from_errno("asprintf");
2509 		header = NULL;
2510 		goto done;
2511 	}
2512 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2513 	if (err)
2514 		goto done;
2515 
2516 	werase(view->window);
2517 
2518 	if (view_needs_focus_indication(view))
2519 		wstandout(view->window);
2520 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2521 	if (tc)
2522 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2523 	waddwstr(view->window, wline);
2524 	while (width < view->ncols) {
2525 		waddch(view->window, ' ');
2526 		width++;
2527 	}
2528 	if (tc)
2529 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2530 	if (view_needs_focus_indication(view))
2531 		wstandend(view->window);
2532 	free(wline);
2533 	if (limit <= 1)
2534 		goto done;
2535 
2536 	/* Grow author column size if necessary, and set view->maxx. */
2537 	entry = s->first_displayed_entry;
2538 	ncommits = 0;
2539 	view->maxx = 0;
2540 	while (entry) {
2541 		struct got_commit_object *c = entry->commit;
2542 		char *author, *eol, *msg, *msg0;
2543 		wchar_t *wauthor, *wmsg;
2544 		int width;
2545 		if (ncommits >= limit - 1)
2546 			break;
2547 		if (s->use_committer)
2548 			author = strdup(got_object_commit_get_committer(c));
2549 		else
2550 			author = strdup(got_object_commit_get_author(c));
2551 		if (author == NULL) {
2552 			err = got_error_from_errno("strdup");
2553 			goto done;
2554 		}
2555 		err = format_author(&wauthor, &width, author, COLS,
2556 		    date_display_cols);
2557 		if (author_cols < width)
2558 			author_cols = width;
2559 		free(wauthor);
2560 		free(author);
2561 		if (err)
2562 			goto done;
2563 		err = got_object_commit_get_logmsg(&msg0, c);
2564 		if (err)
2565 			goto done;
2566 		msg = msg0;
2567 		while (*msg == '\n')
2568 			++msg;
2569 		if ((eol = strchr(msg, '\n')))
2570 			*eol = '\0';
2571 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2572 		    date_display_cols + author_cols, 0);
2573 		if (err)
2574 			goto done;
2575 		view->maxx = MAX(view->maxx, width);
2576 		free(msg0);
2577 		free(wmsg);
2578 		ncommits++;
2579 		entry = TAILQ_NEXT(entry, entry);
2580 	}
2581 
2582 	entry = s->first_displayed_entry;
2583 	s->last_displayed_entry = s->first_displayed_entry;
2584 	ncommits = 0;
2585 	while (entry) {
2586 		if (ncommits >= limit - 1)
2587 			break;
2588 		if (ncommits == s->selected)
2589 			wstandout(view->window);
2590 		err = draw_commit(view, entry->commit, entry->id,
2591 		    date_display_cols, author_cols);
2592 		if (ncommits == s->selected)
2593 			wstandend(view->window);
2594 		if (err)
2595 			goto done;
2596 		ncommits++;
2597 		s->last_displayed_entry = entry;
2598 		entry = TAILQ_NEXT(entry, entry);
2599 	}
2600 
2601 	view_border(view);
2602 done:
2603 	free(id_str);
2604 	free(refs_str);
2605 	free(ncommits_str);
2606 	free(header);
2607 	return err;
2608 }
2609 
2610 static void
2611 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2612 {
2613 	struct commit_queue_entry *entry;
2614 	int nscrolled = 0;
2615 
2616 	entry = TAILQ_FIRST(&s->commits->head);
2617 	if (s->first_displayed_entry == entry)
2618 		return;
2619 
2620 	entry = s->first_displayed_entry;
2621 	while (entry && nscrolled < maxscroll) {
2622 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2623 		if (entry) {
2624 			s->first_displayed_entry = entry;
2625 			nscrolled++;
2626 		}
2627 	}
2628 }
2629 
2630 static const struct got_error *
2631 trigger_log_thread(struct tog_view *view, int wait)
2632 {
2633 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2634 	int errcode;
2635 
2636 	halfdelay(1); /* fast refresh while loading commits */
2637 
2638 	while (!ta->log_complete && !tog_thread_error &&
2639 	    (ta->commits_needed > 0 || ta->load_all)) {
2640 		/* Wake the log thread. */
2641 		errcode = pthread_cond_signal(&ta->need_commits);
2642 		if (errcode)
2643 			return got_error_set_errno(errcode,
2644 			    "pthread_cond_signal");
2645 
2646 		/*
2647 		 * The mutex will be released while the view loop waits
2648 		 * in wgetch(), at which time the log thread will run.
2649 		 */
2650 		if (!wait)
2651 			break;
2652 
2653 		/* Display progress update in log view. */
2654 		show_log_view(view);
2655 		update_panels();
2656 		doupdate();
2657 
2658 		/* Wait right here while next commit is being loaded. */
2659 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2660 		if (errcode)
2661 			return got_error_set_errno(errcode,
2662 			    "pthread_cond_wait");
2663 
2664 		/* Display progress update in log view. */
2665 		show_log_view(view);
2666 		update_panels();
2667 		doupdate();
2668 	}
2669 
2670 	return NULL;
2671 }
2672 
2673 static const struct got_error *
2674 request_log_commits(struct tog_view *view)
2675 {
2676 	struct tog_log_view_state	*state = &view->state.log;
2677 	const struct got_error		*err = NULL;
2678 
2679 	if (state->thread_args.log_complete)
2680 		return NULL;
2681 
2682 	state->thread_args.commits_needed += view->nscrolled;
2683 	err = trigger_log_thread(view, 1);
2684 	view->nscrolled = 0;
2685 
2686 	return err;
2687 }
2688 
2689 static const struct got_error *
2690 log_scroll_down(struct tog_view *view, int maxscroll)
2691 {
2692 	struct tog_log_view_state *s = &view->state.log;
2693 	const struct got_error *err = NULL;
2694 	struct commit_queue_entry *pentry;
2695 	int nscrolled = 0, ncommits_needed;
2696 
2697 	if (s->last_displayed_entry == NULL)
2698 		return NULL;
2699 
2700 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2701 	if (s->commits->ncommits < ncommits_needed &&
2702 	    !s->thread_args.log_complete) {
2703 		/*
2704 		 * Ask the log thread for required amount of commits.
2705 		 */
2706 		s->thread_args.commits_needed +=
2707 		    ncommits_needed - s->commits->ncommits;
2708 		err = trigger_log_thread(view, 1);
2709 		if (err)
2710 			return err;
2711 	}
2712 
2713 	do {
2714 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2715 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2716 			break;
2717 
2718 		s->last_displayed_entry = pentry ?
2719 		    pentry : s->last_displayed_entry;;
2720 
2721 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2722 		if (pentry == NULL)
2723 			break;
2724 		s->first_displayed_entry = pentry;
2725 	} while (++nscrolled < maxscroll);
2726 
2727 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2728 		view->nscrolled += nscrolled;
2729 	else
2730 		view->nscrolled = 0;
2731 
2732 	return err;
2733 }
2734 
2735 static const struct got_error *
2736 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2737     struct got_commit_object *commit, struct got_object_id *commit_id,
2738     struct tog_view *log_view, struct got_repository *repo)
2739 {
2740 	const struct got_error *err;
2741 	struct got_object_qid *parent_id;
2742 	struct tog_view *diff_view;
2743 
2744 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2745 	if (diff_view == NULL)
2746 		return got_error_from_errno("view_open");
2747 
2748 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2749 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2750 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2751 	if (err == NULL)
2752 		*new_view = diff_view;
2753 	return err;
2754 }
2755 
2756 static const struct got_error *
2757 tree_view_visit_subtree(struct tog_tree_view_state *s,
2758     struct got_tree_object *subtree)
2759 {
2760 	struct tog_parent_tree *parent;
2761 
2762 	parent = calloc(1, sizeof(*parent));
2763 	if (parent == NULL)
2764 		return got_error_from_errno("calloc");
2765 
2766 	parent->tree = s->tree;
2767 	parent->first_displayed_entry = s->first_displayed_entry;
2768 	parent->selected_entry = s->selected_entry;
2769 	parent->selected = s->selected;
2770 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2771 	s->tree = subtree;
2772 	s->selected = 0;
2773 	s->first_displayed_entry = NULL;
2774 	return NULL;
2775 }
2776 
2777 static const struct got_error *
2778 tree_view_walk_path(struct tog_tree_view_state *s,
2779     struct got_commit_object *commit, const char *path)
2780 {
2781 	const struct got_error *err = NULL;
2782 	struct got_tree_object *tree = NULL;
2783 	const char *p;
2784 	char *slash, *subpath = NULL;
2785 
2786 	/* Walk the path and open corresponding tree objects. */
2787 	p = path;
2788 	while (*p) {
2789 		struct got_tree_entry *te;
2790 		struct got_object_id *tree_id;
2791 		char *te_name;
2792 
2793 		while (p[0] == '/')
2794 			p++;
2795 
2796 		/* Ensure the correct subtree entry is selected. */
2797 		slash = strchr(p, '/');
2798 		if (slash == NULL)
2799 			te_name = strdup(p);
2800 		else
2801 			te_name = strndup(p, slash - p);
2802 		if (te_name == NULL) {
2803 			err = got_error_from_errno("strndup");
2804 			break;
2805 		}
2806 		te = got_object_tree_find_entry(s->tree, te_name);
2807 		if (te == NULL) {
2808 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2809 			free(te_name);
2810 			break;
2811 		}
2812 		free(te_name);
2813 		s->first_displayed_entry = s->selected_entry = te;
2814 
2815 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2816 			break; /* jump to this file's entry */
2817 
2818 		slash = strchr(p, '/');
2819 		if (slash)
2820 			subpath = strndup(path, slash - path);
2821 		else
2822 			subpath = strdup(path);
2823 		if (subpath == NULL) {
2824 			err = got_error_from_errno("strdup");
2825 			break;
2826 		}
2827 
2828 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2829 		    subpath);
2830 		if (err)
2831 			break;
2832 
2833 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2834 		free(tree_id);
2835 		if (err)
2836 			break;
2837 
2838 		err = tree_view_visit_subtree(s, tree);
2839 		if (err) {
2840 			got_object_tree_close(tree);
2841 			break;
2842 		}
2843 		if (slash == NULL)
2844 			break;
2845 		free(subpath);
2846 		subpath = NULL;
2847 		p = slash;
2848 	}
2849 
2850 	free(subpath);
2851 	return err;
2852 }
2853 
2854 static const struct got_error *
2855 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2856     struct commit_queue_entry *entry, const char *path,
2857     const char *head_ref_name, struct got_repository *repo)
2858 {
2859 	const struct got_error *err = NULL;
2860 	struct tog_tree_view_state *s;
2861 	struct tog_view *tree_view;
2862 
2863 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2864 	if (tree_view == NULL)
2865 		return got_error_from_errno("view_open");
2866 
2867 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2868 	if (err)
2869 		return err;
2870 	s = &tree_view->state.tree;
2871 
2872 	*new_view = tree_view;
2873 
2874 	if (got_path_is_root_dir(path))
2875 		return NULL;
2876 
2877 	return tree_view_walk_path(s, entry->commit, path);
2878 }
2879 
2880 static const struct got_error *
2881 block_signals_used_by_main_thread(void)
2882 {
2883 	sigset_t sigset;
2884 	int errcode;
2885 
2886 	if (sigemptyset(&sigset) == -1)
2887 		return got_error_from_errno("sigemptyset");
2888 
2889 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2890 	if (sigaddset(&sigset, SIGWINCH) == -1)
2891 		return got_error_from_errno("sigaddset");
2892 	if (sigaddset(&sigset, SIGCONT) == -1)
2893 		return got_error_from_errno("sigaddset");
2894 	if (sigaddset(&sigset, SIGINT) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGTERM) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 
2899 	/* ncurses handles SIGTSTP */
2900 	if (sigaddset(&sigset, SIGTSTP) == -1)
2901 		return got_error_from_errno("sigaddset");
2902 
2903 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2904 	if (errcode)
2905 		return got_error_set_errno(errcode, "pthread_sigmask");
2906 
2907 	return NULL;
2908 }
2909 
2910 static void *
2911 log_thread(void *arg)
2912 {
2913 	const struct got_error *err = NULL;
2914 	int errcode = 0;
2915 	struct tog_log_thread_args *a = arg;
2916 	int done = 0;
2917 
2918 	/*
2919 	 * Sync startup with main thread such that we begin our
2920 	 * work once view_input() has released the mutex.
2921 	 */
2922 	errcode = pthread_mutex_lock(&tog_mutex);
2923 	if (errcode) {
2924 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2925 		return (void *)err;
2926 	}
2927 
2928 	err = block_signals_used_by_main_thread();
2929 	if (err) {
2930 		pthread_mutex_unlock(&tog_mutex);
2931 		goto done;
2932 	}
2933 
2934 	while (!done && !err && !tog_fatal_signal_received()) {
2935 		errcode = pthread_mutex_unlock(&tog_mutex);
2936 		if (errcode) {
2937 			err = got_error_set_errno(errcode,
2938 			    "pthread_mutex_unlock");
2939 			goto done;
2940 		}
2941 		err = queue_commits(a);
2942 		if (err) {
2943 			if (err->code != GOT_ERR_ITER_COMPLETED)
2944 				goto done;
2945 			err = NULL;
2946 			done = 1;
2947 		} else if (a->commits_needed > 0 && !a->load_all) {
2948 			if (*a->limiting) {
2949 				if (a->limit_match)
2950 					a->commits_needed--;
2951 			} else
2952 				a->commits_needed--;
2953 		}
2954 
2955 		errcode = pthread_mutex_lock(&tog_mutex);
2956 		if (errcode) {
2957 			err = got_error_set_errno(errcode,
2958 			    "pthread_mutex_lock");
2959 			goto done;
2960 		} else if (*a->quit)
2961 			done = 1;
2962 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2963 			*a->first_displayed_entry =
2964 			    TAILQ_FIRST(&a->limit_commits->head);
2965 			*a->selected_entry = *a->first_displayed_entry;
2966 		} else if (*a->first_displayed_entry == NULL) {
2967 			*a->first_displayed_entry =
2968 			    TAILQ_FIRST(&a->real_commits->head);
2969 			*a->selected_entry = *a->first_displayed_entry;
2970 		}
2971 
2972 		errcode = pthread_cond_signal(&a->commit_loaded);
2973 		if (errcode) {
2974 			err = got_error_set_errno(errcode,
2975 			    "pthread_cond_signal");
2976 			pthread_mutex_unlock(&tog_mutex);
2977 			goto done;
2978 		}
2979 
2980 		if (done)
2981 			a->commits_needed = 0;
2982 		else {
2983 			if (a->commits_needed == 0 && !a->load_all) {
2984 				errcode = pthread_cond_wait(&a->need_commits,
2985 				    &tog_mutex);
2986 				if (errcode) {
2987 					err = got_error_set_errno(errcode,
2988 					    "pthread_cond_wait");
2989 					pthread_mutex_unlock(&tog_mutex);
2990 					goto done;
2991 				}
2992 				if (*a->quit)
2993 					done = 1;
2994 			}
2995 		}
2996 	}
2997 	a->log_complete = 1;
2998 	errcode = pthread_mutex_unlock(&tog_mutex);
2999 	if (errcode)
3000 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3001 done:
3002 	if (err) {
3003 		tog_thread_error = 1;
3004 		pthread_cond_signal(&a->commit_loaded);
3005 	}
3006 	return (void *)err;
3007 }
3008 
3009 static const struct got_error *
3010 stop_log_thread(struct tog_log_view_state *s)
3011 {
3012 	const struct got_error *err = NULL, *thread_err = NULL;
3013 	int errcode;
3014 
3015 	if (s->thread) {
3016 		s->quit = 1;
3017 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3018 		if (errcode)
3019 			return got_error_set_errno(errcode,
3020 			    "pthread_cond_signal");
3021 		errcode = pthread_mutex_unlock(&tog_mutex);
3022 		if (errcode)
3023 			return got_error_set_errno(errcode,
3024 			    "pthread_mutex_unlock");
3025 		errcode = pthread_join(s->thread, (void **)&thread_err);
3026 		if (errcode)
3027 			return got_error_set_errno(errcode, "pthread_join");
3028 		errcode = pthread_mutex_lock(&tog_mutex);
3029 		if (errcode)
3030 			return got_error_set_errno(errcode,
3031 			    "pthread_mutex_lock");
3032 		s->thread = NULL;
3033 	}
3034 
3035 	if (s->thread_args.repo) {
3036 		err = got_repo_close(s->thread_args.repo);
3037 		s->thread_args.repo = NULL;
3038 	}
3039 
3040 	if (s->thread_args.pack_fds) {
3041 		const struct got_error *pack_err =
3042 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3043 		if (err == NULL)
3044 			err = pack_err;
3045 		s->thread_args.pack_fds = NULL;
3046 	}
3047 
3048 	if (s->thread_args.graph) {
3049 		got_commit_graph_close(s->thread_args.graph);
3050 		s->thread_args.graph = NULL;
3051 	}
3052 
3053 	return err ? err : thread_err;
3054 }
3055 
3056 static const struct got_error *
3057 close_log_view(struct tog_view *view)
3058 {
3059 	const struct got_error *err = NULL;
3060 	struct tog_log_view_state *s = &view->state.log;
3061 	int errcode;
3062 
3063 	err = stop_log_thread(s);
3064 
3065 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3066 	if (errcode && err == NULL)
3067 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3068 
3069 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3070 	if (errcode && err == NULL)
3071 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3072 
3073 	free_commits(&s->limit_commits);
3074 	free_commits(&s->real_commits);
3075 	free(s->in_repo_path);
3076 	s->in_repo_path = NULL;
3077 	free(s->start_id);
3078 	s->start_id = NULL;
3079 	free(s->head_ref_name);
3080 	s->head_ref_name = NULL;
3081 	return err;
3082 }
3083 
3084 /*
3085  * We use two queues to implement the limit feature: first consists of
3086  * commits matching the current limit_regex; second is the real queue
3087  * of all known commits (real_commits). When the user starts limiting,
3088  * we swap queues such that all movement and displaying functionality
3089  * works with very slight change.
3090  */
3091 static const struct got_error *
3092 limit_log_view(struct tog_view *view)
3093 {
3094 	struct tog_log_view_state *s = &view->state.log;
3095 	struct commit_queue_entry *entry;
3096 	struct tog_view	*v = view;
3097 	const struct got_error *err = NULL;
3098 	char pattern[1024];
3099 	int ret;
3100 
3101 	if (view_is_hsplit_top(view))
3102 		v = view->child;
3103 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3104 		v = view->parent;
3105 
3106 	/* Get the pattern */
3107 	wmove(v->window, v->nlines - 1, 0);
3108 	wclrtoeol(v->window);
3109 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3110 	nodelay(v->window, FALSE);
3111 	nocbreak();
3112 	echo();
3113 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3114 	cbreak();
3115 	noecho();
3116 	nodelay(v->window, TRUE);
3117 	if (ret == ERR)
3118 		return NULL;
3119 
3120 	if (*pattern == '\0') {
3121 		/*
3122 		 * Safety measure for the situation where the user
3123 		 * resets limit without previously limiting anything.
3124 		 */
3125 		if (!s->limit_view)
3126 			return NULL;
3127 
3128 		/*
3129 		 * User could have pressed Ctrl+L, which refreshed the
3130 		 * commit queues, it means we can't save previously
3131 		 * (before limit took place) displayed entries,
3132 		 * because they would point to already free'ed memory,
3133 		 * so we are forced to always select first entry of
3134 		 * the queue.
3135 		 */
3136 		s->commits = &s->real_commits;
3137 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3138 		s->selected_entry = s->first_displayed_entry;
3139 		s->selected = 0;
3140 		s->limit_view = 0;
3141 
3142 		return NULL;
3143 	}
3144 
3145 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3146 		return NULL;
3147 
3148 	s->limit_view = 1;
3149 
3150 	/* Clear the screen while loading limit view */
3151 	s->first_displayed_entry = NULL;
3152 	s->last_displayed_entry = NULL;
3153 	s->selected_entry = NULL;
3154 	s->commits = &s->limit_commits;
3155 
3156 	/* Prepare limit queue for new search */
3157 	free_commits(&s->limit_commits);
3158 	s->limit_commits.ncommits = 0;
3159 
3160 	/* First process commits, which are in queue already */
3161 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3162 		int have_match = 0;
3163 
3164 		err = match_commit(&have_match, entry->id,
3165 		    entry->commit, &s->limit_regex);
3166 		if (err)
3167 			return err;
3168 
3169 		if (have_match) {
3170 			struct commit_queue_entry *matched;
3171 
3172 			matched = alloc_commit_queue_entry(entry->commit,
3173 			    entry->id);
3174 			if (matched == NULL) {
3175 				err = got_error_from_errno(
3176 				    "alloc_commit_queue_entry");
3177 				break;
3178 			}
3179 			matched->commit = entry->commit;
3180 			got_object_commit_retain(entry->commit);
3181 
3182 			matched->idx = s->limit_commits.ncommits;
3183 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3184 			    matched, entry);
3185 			s->limit_commits.ncommits++;
3186 		}
3187 	}
3188 
3189 	/* Second process all the commits, until we fill the screen */
3190 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3191 	    !s->thread_args.log_complete) {
3192 		s->thread_args.commits_needed +=
3193 		    view->nlines - s->limit_commits.ncommits - 1;
3194 		err = trigger_log_thread(view, 1);
3195 		if (err)
3196 			return err;
3197 	}
3198 
3199 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3200 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3201 	s->selected = 0;
3202 
3203 	return NULL;
3204 }
3205 
3206 static const struct got_error *
3207 search_start_log_view(struct tog_view *view)
3208 {
3209 	struct tog_log_view_state *s = &view->state.log;
3210 
3211 	s->matched_entry = NULL;
3212 	s->search_entry = NULL;
3213 	return NULL;
3214 }
3215 
3216 static const struct got_error *
3217 search_next_log_view(struct tog_view *view)
3218 {
3219 	const struct got_error *err = NULL;
3220 	struct tog_log_view_state *s = &view->state.log;
3221 	struct commit_queue_entry *entry;
3222 
3223 	/* Display progress update in log view. */
3224 	show_log_view(view);
3225 	update_panels();
3226 	doupdate();
3227 
3228 	if (s->search_entry) {
3229 		int errcode, ch;
3230 		errcode = pthread_mutex_unlock(&tog_mutex);
3231 		if (errcode)
3232 			return got_error_set_errno(errcode,
3233 			    "pthread_mutex_unlock");
3234 		ch = wgetch(view->window);
3235 		errcode = pthread_mutex_lock(&tog_mutex);
3236 		if (errcode)
3237 			return got_error_set_errno(errcode,
3238 			    "pthread_mutex_lock");
3239 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3240 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3241 			return NULL;
3242 		}
3243 		if (view->searching == TOG_SEARCH_FORWARD)
3244 			entry = TAILQ_NEXT(s->search_entry, entry);
3245 		else
3246 			entry = TAILQ_PREV(s->search_entry,
3247 			    commit_queue_head, entry);
3248 	} else if (s->matched_entry) {
3249 		/*
3250 		 * If the user has moved the cursor after we hit a match,
3251 		 * the position from where we should continue searching
3252 		 * might have changed.
3253 		 */
3254 		if (view->searching == TOG_SEARCH_FORWARD)
3255 			entry = TAILQ_NEXT(s->selected_entry, entry);
3256 		else
3257 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3258 			    entry);
3259 	} else {
3260 		entry = s->selected_entry;
3261 	}
3262 
3263 	while (1) {
3264 		int have_match = 0;
3265 
3266 		if (entry == NULL) {
3267 			if (s->thread_args.log_complete ||
3268 			    view->searching == TOG_SEARCH_BACKWARD) {
3269 				view->search_next_done =
3270 				    (s->matched_entry == NULL ?
3271 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3272 				s->search_entry = NULL;
3273 				return NULL;
3274 			}
3275 			/*
3276 			 * Poke the log thread for more commits and return,
3277 			 * allowing the main loop to make progress. Search
3278 			 * will resume at s->search_entry once we come back.
3279 			 */
3280 			s->thread_args.commits_needed++;
3281 			return trigger_log_thread(view, 0);
3282 		}
3283 
3284 		err = match_commit(&have_match, entry->id, entry->commit,
3285 		    &view->regex);
3286 		if (err)
3287 			break;
3288 		if (have_match) {
3289 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3290 			s->matched_entry = entry;
3291 			break;
3292 		}
3293 
3294 		s->search_entry = entry;
3295 		if (view->searching == TOG_SEARCH_FORWARD)
3296 			entry = TAILQ_NEXT(entry, entry);
3297 		else
3298 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3299 	}
3300 
3301 	if (s->matched_entry) {
3302 		int cur = s->selected_entry->idx;
3303 		while (cur < s->matched_entry->idx) {
3304 			err = input_log_view(NULL, view, KEY_DOWN);
3305 			if (err)
3306 				return err;
3307 			cur++;
3308 		}
3309 		while (cur > s->matched_entry->idx) {
3310 			err = input_log_view(NULL, view, KEY_UP);
3311 			if (err)
3312 				return err;
3313 			cur--;
3314 		}
3315 	}
3316 
3317 	s->search_entry = NULL;
3318 
3319 	return NULL;
3320 }
3321 
3322 static const struct got_error *
3323 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3324     struct got_repository *repo, const char *head_ref_name,
3325     const char *in_repo_path, int log_branches)
3326 {
3327 	const struct got_error *err = NULL;
3328 	struct tog_log_view_state *s = &view->state.log;
3329 	struct got_repository *thread_repo = NULL;
3330 	struct got_commit_graph *thread_graph = NULL;
3331 	int errcode;
3332 
3333 	if (in_repo_path != s->in_repo_path) {
3334 		free(s->in_repo_path);
3335 		s->in_repo_path = strdup(in_repo_path);
3336 		if (s->in_repo_path == NULL)
3337 			return got_error_from_errno("strdup");
3338 	}
3339 
3340 	/* The commit queue only contains commits being displayed. */
3341 	TAILQ_INIT(&s->real_commits.head);
3342 	s->real_commits.ncommits = 0;
3343 	s->commits = &s->real_commits;
3344 
3345 	TAILQ_INIT(&s->limit_commits.head);
3346 	s->limit_view = 0;
3347 	s->limit_commits.ncommits = 0;
3348 
3349 	s->repo = repo;
3350 	if (head_ref_name) {
3351 		s->head_ref_name = strdup(head_ref_name);
3352 		if (s->head_ref_name == NULL) {
3353 			err = got_error_from_errno("strdup");
3354 			goto done;
3355 		}
3356 	}
3357 	s->start_id = got_object_id_dup(start_id);
3358 	if (s->start_id == NULL) {
3359 		err = got_error_from_errno("got_object_id_dup");
3360 		goto done;
3361 	}
3362 	s->log_branches = log_branches;
3363 
3364 	STAILQ_INIT(&s->colors);
3365 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3366 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3367 		    get_color_value("TOG_COLOR_COMMIT"));
3368 		if (err)
3369 			goto done;
3370 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3371 		    get_color_value("TOG_COLOR_AUTHOR"));
3372 		if (err) {
3373 			free_colors(&s->colors);
3374 			goto done;
3375 		}
3376 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3377 		    get_color_value("TOG_COLOR_DATE"));
3378 		if (err) {
3379 			free_colors(&s->colors);
3380 			goto done;
3381 		}
3382 	}
3383 
3384 	view->show = show_log_view;
3385 	view->input = input_log_view;
3386 	view->resize = resize_log_view;
3387 	view->close = close_log_view;
3388 	view->search_start = search_start_log_view;
3389 	view->search_next = search_next_log_view;
3390 
3391 	if (s->thread_args.pack_fds == NULL) {
3392 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3393 		if (err)
3394 			goto done;
3395 	}
3396 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3397 	    s->thread_args.pack_fds);
3398 	if (err)
3399 		goto done;
3400 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3401 	    !s->log_branches);
3402 	if (err)
3403 		goto done;
3404 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3405 	    s->repo, NULL, NULL);
3406 	if (err)
3407 		goto done;
3408 
3409 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3410 	if (errcode) {
3411 		err = got_error_set_errno(errcode, "pthread_cond_init");
3412 		goto done;
3413 	}
3414 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3415 	if (errcode) {
3416 		err = got_error_set_errno(errcode, "pthread_cond_init");
3417 		goto done;
3418 	}
3419 
3420 	s->thread_args.commits_needed = view->nlines;
3421 	s->thread_args.graph = thread_graph;
3422 	s->thread_args.real_commits = &s->real_commits;
3423 	s->thread_args.limit_commits = &s->limit_commits;
3424 	s->thread_args.in_repo_path = s->in_repo_path;
3425 	s->thread_args.start_id = s->start_id;
3426 	s->thread_args.repo = thread_repo;
3427 	s->thread_args.log_complete = 0;
3428 	s->thread_args.quit = &s->quit;
3429 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3430 	s->thread_args.selected_entry = &s->selected_entry;
3431 	s->thread_args.searching = &view->searching;
3432 	s->thread_args.search_next_done = &view->search_next_done;
3433 	s->thread_args.regex = &view->regex;
3434 	s->thread_args.limiting = &s->limit_view;
3435 	s->thread_args.limit_regex = &s->limit_regex;
3436 	s->thread_args.limit_commits = &s->limit_commits;
3437 done:
3438 	if (err)
3439 		close_log_view(view);
3440 	return err;
3441 }
3442 
3443 static const struct got_error *
3444 show_log_view(struct tog_view *view)
3445 {
3446 	const struct got_error *err;
3447 	struct tog_log_view_state *s = &view->state.log;
3448 
3449 	if (s->thread == NULL) {
3450 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3451 		    &s->thread_args);
3452 		if (errcode)
3453 			return got_error_set_errno(errcode, "pthread_create");
3454 		if (s->thread_args.commits_needed > 0) {
3455 			err = trigger_log_thread(view, 1);
3456 			if (err)
3457 				return err;
3458 		}
3459 	}
3460 
3461 	return draw_commits(view);
3462 }
3463 
3464 static void
3465 log_move_cursor_up(struct tog_view *view, int page, int home)
3466 {
3467 	struct tog_log_view_state *s = &view->state.log;
3468 
3469 	if (s->first_displayed_entry == NULL)
3470 		return;
3471 	if (s->selected_entry->idx == 0)
3472 		view->count = 0;
3473 
3474 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3475 	    || home)
3476 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3477 
3478 	if (!page && !home && s->selected > 0)
3479 		--s->selected;
3480 	else
3481 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3482 
3483 	select_commit(s);
3484 	return;
3485 }
3486 
3487 static const struct got_error *
3488 log_move_cursor_down(struct tog_view *view, int page)
3489 {
3490 	struct tog_log_view_state	*s = &view->state.log;
3491 	const struct got_error		*err = NULL;
3492 	int				 eos = view->nlines - 2;
3493 
3494 	if (s->first_displayed_entry == NULL)
3495 		return NULL;
3496 
3497 	if (s->thread_args.log_complete &&
3498 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3499 		return NULL;
3500 
3501 	if (view_is_hsplit_top(view))
3502 		--eos;  /* border consumes the last line */
3503 
3504 	if (!page) {
3505 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3506 			++s->selected;
3507 		else
3508 			err = log_scroll_down(view, 1);
3509 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3510 		struct commit_queue_entry *entry;
3511 		int n;
3512 
3513 		s->selected = 0;
3514 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3515 		s->last_displayed_entry = entry;
3516 		for (n = 0; n <= eos; n++) {
3517 			if (entry == NULL)
3518 				break;
3519 			s->first_displayed_entry = entry;
3520 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3521 		}
3522 		if (n > 0)
3523 			s->selected = n - 1;
3524 	} else {
3525 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3526 		    s->thread_args.log_complete)
3527 			s->selected += MIN(page,
3528 			    s->commits->ncommits - s->selected_entry->idx - 1);
3529 		else
3530 			err = log_scroll_down(view, page);
3531 	}
3532 	if (err)
3533 		return err;
3534 
3535 	/*
3536 	 * We might necessarily overshoot in horizontal
3537 	 * splits; if so, select the last displayed commit.
3538 	 */
3539 	if (s->first_displayed_entry && s->last_displayed_entry) {
3540 		s->selected = MIN(s->selected,
3541 		    s->last_displayed_entry->idx -
3542 		    s->first_displayed_entry->idx);
3543 	}
3544 
3545 	select_commit(s);
3546 
3547 	if (s->thread_args.log_complete &&
3548 	    s->selected_entry->idx == s->commits->ncommits - 1)
3549 		view->count = 0;
3550 
3551 	return NULL;
3552 }
3553 
3554 static void
3555 view_get_split(struct tog_view *view, int *y, int *x)
3556 {
3557 	*x = 0;
3558 	*y = 0;
3559 
3560 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3561 		if (view->child && view->child->resized_y)
3562 			*y = view->child->resized_y;
3563 		else if (view->resized_y)
3564 			*y = view->resized_y;
3565 		else
3566 			*y = view_split_begin_y(view->lines);
3567 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3568 		if (view->child && view->child->resized_x)
3569 			*x = view->child->resized_x;
3570 		else if (view->resized_x)
3571 			*x = view->resized_x;
3572 		else
3573 			*x = view_split_begin_x(view->begin_x);
3574 	}
3575 }
3576 
3577 /* Split view horizontally at y and offset view->state->selected line. */
3578 static const struct got_error *
3579 view_init_hsplit(struct tog_view *view, int y)
3580 {
3581 	const struct got_error *err = NULL;
3582 
3583 	view->nlines = y;
3584 	view->ncols = COLS;
3585 	err = view_resize(view);
3586 	if (err)
3587 		return err;
3588 
3589 	err = offset_selection_down(view);
3590 
3591 	return err;
3592 }
3593 
3594 static const struct got_error *
3595 log_goto_line(struct tog_view *view, int nlines)
3596 {
3597 	const struct got_error		*err = NULL;
3598 	struct tog_log_view_state	*s = &view->state.log;
3599 	int				 g, idx = s->selected_entry->idx;
3600 
3601 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3602 		return NULL;
3603 
3604 	g = view->gline;
3605 	view->gline = 0;
3606 
3607 	if (g >= s->first_displayed_entry->idx + 1 &&
3608 	    g <= s->last_displayed_entry->idx + 1 &&
3609 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3610 		s->selected = g - s->first_displayed_entry->idx - 1;
3611 		select_commit(s);
3612 		return NULL;
3613 	}
3614 
3615 	if (idx + 1 < g) {
3616 		err = log_move_cursor_down(view, g - idx - 1);
3617 		if (!err && g > s->selected_entry->idx + 1)
3618 			err = log_move_cursor_down(view,
3619 			    g - s->first_displayed_entry->idx - 1);
3620 		if (err)
3621 			return err;
3622 	} else if (idx + 1 > g)
3623 		log_move_cursor_up(view, idx - g + 1, 0);
3624 
3625 	if (g < nlines && s->first_displayed_entry->idx == 0)
3626 		s->selected = g - 1;
3627 
3628 	select_commit(s);
3629 	return NULL;
3630 
3631 }
3632 
3633 static const struct got_error *
3634 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3635 {
3636 	const struct got_error *err = NULL;
3637 	struct tog_log_view_state *s = &view->state.log;
3638 	int eos, nscroll;
3639 
3640 	if (s->thread_args.load_all) {
3641 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3642 			s->thread_args.load_all = 0;
3643 		else if (s->thread_args.log_complete) {
3644 			err = log_move_cursor_down(view, s->commits->ncommits);
3645 			s->thread_args.load_all = 0;
3646 		}
3647 		if (err)
3648 			return err;
3649 	}
3650 
3651 	eos = nscroll = view->nlines - 1;
3652 	if (view_is_hsplit_top(view))
3653 		--eos;  /* border */
3654 
3655 	if (view->gline)
3656 		return log_goto_line(view, eos);
3657 
3658 	switch (ch) {
3659 	case '&':
3660 		err = limit_log_view(view);
3661 		break;
3662 	case 'q':
3663 		s->quit = 1;
3664 		break;
3665 	case '0':
3666 		view->x = 0;
3667 		break;
3668 	case '$':
3669 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3670 		view->count = 0;
3671 		break;
3672 	case KEY_RIGHT:
3673 	case 'l':
3674 		if (view->x + view->ncols / 2 < view->maxx)
3675 			view->x += 2;  /* move two columns right */
3676 		else
3677 			view->count = 0;
3678 		break;
3679 	case KEY_LEFT:
3680 	case 'h':
3681 		view->x -= MIN(view->x, 2);  /* move two columns back */
3682 		if (view->x <= 0)
3683 			view->count = 0;
3684 		break;
3685 	case 'k':
3686 	case KEY_UP:
3687 	case '<':
3688 	case ',':
3689 	case CTRL('p'):
3690 		log_move_cursor_up(view, 0, 0);
3691 		break;
3692 	case 'g':
3693 	case KEY_HOME:
3694 		log_move_cursor_up(view, 0, 1);
3695 		view->count = 0;
3696 		break;
3697 	case CTRL('u'):
3698 	case 'u':
3699 		nscroll /= 2;
3700 		/* FALL THROUGH */
3701 	case KEY_PPAGE:
3702 	case CTRL('b'):
3703 	case 'b':
3704 		log_move_cursor_up(view, nscroll, 0);
3705 		break;
3706 	case 'j':
3707 	case KEY_DOWN:
3708 	case '>':
3709 	case '.':
3710 	case CTRL('n'):
3711 		err = log_move_cursor_down(view, 0);
3712 		break;
3713 	case '@':
3714 		s->use_committer = !s->use_committer;
3715 		break;
3716 	case 'G':
3717 	case KEY_END: {
3718 		/* We don't know yet how many commits, so we're forced to
3719 		 * traverse them all. */
3720 		view->count = 0;
3721 		s->thread_args.load_all = 1;
3722 		if (!s->thread_args.log_complete)
3723 			return trigger_log_thread(view, 0);
3724 		err = log_move_cursor_down(view, s->commits->ncommits);
3725 		s->thread_args.load_all = 0;
3726 		break;
3727 	}
3728 	case CTRL('d'):
3729 	case 'd':
3730 		nscroll /= 2;
3731 		/* FALL THROUGH */
3732 	case KEY_NPAGE:
3733 	case CTRL('f'):
3734 	case 'f':
3735 	case ' ':
3736 		err = log_move_cursor_down(view, nscroll);
3737 		break;
3738 	case KEY_RESIZE:
3739 		if (s->selected > view->nlines - 2)
3740 			s->selected = view->nlines - 2;
3741 		if (s->selected > s->commits->ncommits - 1)
3742 			s->selected = s->commits->ncommits - 1;
3743 		select_commit(s);
3744 		if (s->commits->ncommits < view->nlines - 1 &&
3745 		    !s->thread_args.log_complete) {
3746 			s->thread_args.commits_needed += (view->nlines - 1) -
3747 			    s->commits->ncommits;
3748 			err = trigger_log_thread(view, 1);
3749 		}
3750 		break;
3751 	case KEY_ENTER:
3752 	case '\r':
3753 		view->count = 0;
3754 		if (s->selected_entry == NULL)
3755 			break;
3756 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3757 		break;
3758 	case 'T':
3759 		view->count = 0;
3760 		if (s->selected_entry == NULL)
3761 			break;
3762 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3763 		break;
3764 	case KEY_BACKSPACE:
3765 	case CTRL('l'):
3766 	case 'B':
3767 		view->count = 0;
3768 		if (ch == KEY_BACKSPACE &&
3769 		    got_path_is_root_dir(s->in_repo_path))
3770 			break;
3771 		err = stop_log_thread(s);
3772 		if (err)
3773 			return err;
3774 		if (ch == KEY_BACKSPACE) {
3775 			char *parent_path;
3776 			err = got_path_dirname(&parent_path, s->in_repo_path);
3777 			if (err)
3778 				return err;
3779 			free(s->in_repo_path);
3780 			s->in_repo_path = parent_path;
3781 			s->thread_args.in_repo_path = s->in_repo_path;
3782 		} else if (ch == CTRL('l')) {
3783 			struct got_object_id *start_id;
3784 			err = got_repo_match_object_id(&start_id, NULL,
3785 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3786 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3787 			if (err) {
3788 				if (s->head_ref_name == NULL ||
3789 				    err->code != GOT_ERR_NOT_REF)
3790 					return err;
3791 				/* Try to cope with deleted references. */
3792 				free(s->head_ref_name);
3793 				s->head_ref_name = NULL;
3794 				err = got_repo_match_object_id(&start_id,
3795 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3796 				    &tog_refs, s->repo);
3797 				if (err)
3798 					return err;
3799 			}
3800 			free(s->start_id);
3801 			s->start_id = start_id;
3802 			s->thread_args.start_id = s->start_id;
3803 		} else /* 'B' */
3804 			s->log_branches = !s->log_branches;
3805 
3806 		if (s->thread_args.pack_fds == NULL) {
3807 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3808 			if (err)
3809 				return err;
3810 		}
3811 		err = got_repo_open(&s->thread_args.repo,
3812 		    got_repo_get_path(s->repo), NULL,
3813 		    s->thread_args.pack_fds);
3814 		if (err)
3815 			return err;
3816 		tog_free_refs();
3817 		err = tog_load_refs(s->repo, 0);
3818 		if (err)
3819 			return err;
3820 		err = got_commit_graph_open(&s->thread_args.graph,
3821 		    s->in_repo_path, !s->log_branches);
3822 		if (err)
3823 			return err;
3824 		err = got_commit_graph_iter_start(s->thread_args.graph,
3825 		    s->start_id, s->repo, NULL, NULL);
3826 		if (err)
3827 			return err;
3828 		free_commits(&s->real_commits);
3829 		free_commits(&s->limit_commits);
3830 		s->first_displayed_entry = NULL;
3831 		s->last_displayed_entry = NULL;
3832 		s->selected_entry = NULL;
3833 		s->selected = 0;
3834 		s->thread_args.log_complete = 0;
3835 		s->quit = 0;
3836 		s->thread_args.commits_needed = view->lines;
3837 		s->matched_entry = NULL;
3838 		s->search_entry = NULL;
3839 		view->offset = 0;
3840 		break;
3841 	case 'R':
3842 		view->count = 0;
3843 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3844 		break;
3845 	default:
3846 		view->count = 0;
3847 		break;
3848 	}
3849 
3850 	return err;
3851 }
3852 
3853 static const struct got_error *
3854 apply_unveil(const char *repo_path, const char *worktree_path)
3855 {
3856 	const struct got_error *error;
3857 
3858 #ifdef PROFILE
3859 	if (unveil("gmon.out", "rwc") != 0)
3860 		return got_error_from_errno2("unveil", "gmon.out");
3861 #endif
3862 	if (repo_path && unveil(repo_path, "r") != 0)
3863 		return got_error_from_errno2("unveil", repo_path);
3864 
3865 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3866 		return got_error_from_errno2("unveil", worktree_path);
3867 
3868 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3869 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3870 
3871 	error = got_privsep_unveil_exec_helpers();
3872 	if (error != NULL)
3873 		return error;
3874 
3875 	if (unveil(NULL, NULL) != 0)
3876 		return got_error_from_errno("unveil");
3877 
3878 	return NULL;
3879 }
3880 
3881 static void
3882 init_curses(void)
3883 {
3884 	/*
3885 	 * Override default signal handlers before starting ncurses.
3886 	 * This should prevent ncurses from installing its own
3887 	 * broken cleanup() signal handler.
3888 	 */
3889 	signal(SIGWINCH, tog_sigwinch);
3890 	signal(SIGPIPE, tog_sigpipe);
3891 	signal(SIGCONT, tog_sigcont);
3892 	signal(SIGINT, tog_sigint);
3893 	signal(SIGTERM, tog_sigterm);
3894 
3895 	initscr();
3896 	cbreak();
3897 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3898 	noecho();
3899 	nonl();
3900 	intrflush(stdscr, FALSE);
3901 	keypad(stdscr, TRUE);
3902 	curs_set(0);
3903 	if (getenv("TOG_COLORS") != NULL) {
3904 		start_color();
3905 		use_default_colors();
3906 	}
3907 }
3908 
3909 static const struct got_error *
3910 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3911     struct got_repository *repo, struct got_worktree *worktree)
3912 {
3913 	const struct got_error *err = NULL;
3914 
3915 	if (argc == 0) {
3916 		*in_repo_path = strdup("/");
3917 		if (*in_repo_path == NULL)
3918 			return got_error_from_errno("strdup");
3919 		return NULL;
3920 	}
3921 
3922 	if (worktree) {
3923 		const char *prefix = got_worktree_get_path_prefix(worktree);
3924 		char *p;
3925 
3926 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3927 		if (err)
3928 			return err;
3929 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3930 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3931 		    p) == -1) {
3932 			err = got_error_from_errno("asprintf");
3933 			*in_repo_path = NULL;
3934 		}
3935 		free(p);
3936 	} else
3937 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3938 
3939 	return err;
3940 }
3941 
3942 static const struct got_error *
3943 cmd_log(int argc, char *argv[])
3944 {
3945 	const struct got_error *error;
3946 	struct got_repository *repo = NULL;
3947 	struct got_worktree *worktree = NULL;
3948 	struct got_object_id *start_id = NULL;
3949 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3950 	char *start_commit = NULL, *label = NULL;
3951 	struct got_reference *ref = NULL;
3952 	const char *head_ref_name = NULL;
3953 	int ch, log_branches = 0;
3954 	struct tog_view *view;
3955 	int *pack_fds = NULL;
3956 
3957 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3958 		switch (ch) {
3959 		case 'b':
3960 			log_branches = 1;
3961 			break;
3962 		case 'c':
3963 			start_commit = optarg;
3964 			break;
3965 		case 'r':
3966 			repo_path = realpath(optarg, NULL);
3967 			if (repo_path == NULL)
3968 				return got_error_from_errno2("realpath",
3969 				    optarg);
3970 			break;
3971 		default:
3972 			usage_log();
3973 			/* NOTREACHED */
3974 		}
3975 	}
3976 
3977 	argc -= optind;
3978 	argv += optind;
3979 
3980 	if (argc > 1)
3981 		usage_log();
3982 
3983 	error = got_repo_pack_fds_open(&pack_fds);
3984 	if (error != NULL)
3985 		goto done;
3986 
3987 	if (repo_path == NULL) {
3988 		cwd = getcwd(NULL, 0);
3989 		if (cwd == NULL)
3990 			return got_error_from_errno("getcwd");
3991 		error = got_worktree_open(&worktree, cwd);
3992 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3993 			goto done;
3994 		if (worktree)
3995 			repo_path =
3996 			    strdup(got_worktree_get_repo_path(worktree));
3997 		else
3998 			repo_path = strdup(cwd);
3999 		if (repo_path == NULL) {
4000 			error = got_error_from_errno("strdup");
4001 			goto done;
4002 		}
4003 	}
4004 
4005 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4006 	if (error != NULL)
4007 		goto done;
4008 
4009 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4010 	    repo, worktree);
4011 	if (error)
4012 		goto done;
4013 
4014 	init_curses();
4015 
4016 	error = apply_unveil(got_repo_get_path(repo),
4017 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4018 	if (error)
4019 		goto done;
4020 
4021 	/* already loaded by tog_log_with_path()? */
4022 	if (TAILQ_EMPTY(&tog_refs)) {
4023 		error = tog_load_refs(repo, 0);
4024 		if (error)
4025 			goto done;
4026 	}
4027 
4028 	if (start_commit == NULL) {
4029 		error = got_repo_match_object_id(&start_id, &label,
4030 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4031 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4032 		if (error)
4033 			goto done;
4034 		head_ref_name = label;
4035 	} else {
4036 		error = got_ref_open(&ref, repo, start_commit, 0);
4037 		if (error == NULL)
4038 			head_ref_name = got_ref_get_name(ref);
4039 		else if (error->code != GOT_ERR_NOT_REF)
4040 			goto done;
4041 		error = got_repo_match_object_id(&start_id, NULL,
4042 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4043 		if (error)
4044 			goto done;
4045 	}
4046 
4047 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4048 	if (view == NULL) {
4049 		error = got_error_from_errno("view_open");
4050 		goto done;
4051 	}
4052 	error = open_log_view(view, start_id, repo, head_ref_name,
4053 	    in_repo_path, log_branches);
4054 	if (error)
4055 		goto done;
4056 	if (worktree) {
4057 		/* Release work tree lock. */
4058 		got_worktree_close(worktree);
4059 		worktree = NULL;
4060 	}
4061 	error = view_loop(view);
4062 done:
4063 	free(in_repo_path);
4064 	free(repo_path);
4065 	free(cwd);
4066 	free(start_id);
4067 	free(label);
4068 	if (ref)
4069 		got_ref_close(ref);
4070 	if (repo) {
4071 		const struct got_error *close_err = got_repo_close(repo);
4072 		if (error == NULL)
4073 			error = close_err;
4074 	}
4075 	if (worktree)
4076 		got_worktree_close(worktree);
4077 	if (pack_fds) {
4078 		const struct got_error *pack_err =
4079 		    got_repo_pack_fds_close(pack_fds);
4080 		if (error == NULL)
4081 			error = pack_err;
4082 	}
4083 	tog_free_refs();
4084 	return error;
4085 }
4086 
4087 __dead static void
4088 usage_diff(void)
4089 {
4090 	endwin();
4091 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4092 	    "object1 object2\n", getprogname());
4093 	exit(1);
4094 }
4095 
4096 static int
4097 match_line(const char *line, regex_t *regex, size_t nmatch,
4098     regmatch_t *regmatch)
4099 {
4100 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4101 }
4102 
4103 static struct tog_color *
4104 match_color(struct tog_colors *colors, const char *line)
4105 {
4106 	struct tog_color *tc = NULL;
4107 
4108 	STAILQ_FOREACH(tc, colors, entry) {
4109 		if (match_line(line, &tc->regex, 0, NULL))
4110 			return tc;
4111 	}
4112 
4113 	return NULL;
4114 }
4115 
4116 static const struct got_error *
4117 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4118     WINDOW *window, int skipcol, regmatch_t *regmatch)
4119 {
4120 	const struct got_error *err = NULL;
4121 	char *exstr = NULL;
4122 	wchar_t *wline = NULL;
4123 	int rme, rms, n, width, scrollx;
4124 	int width0 = 0, width1 = 0, width2 = 0;
4125 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4126 
4127 	*wtotal = 0;
4128 
4129 	rms = regmatch->rm_so;
4130 	rme = regmatch->rm_eo;
4131 
4132 	err = expand_tab(&exstr, line);
4133 	if (err)
4134 		return err;
4135 
4136 	/* Split the line into 3 segments, according to match offsets. */
4137 	seg0 = strndup(exstr, rms);
4138 	if (seg0 == NULL) {
4139 		err = got_error_from_errno("strndup");
4140 		goto done;
4141 	}
4142 	seg1 = strndup(exstr + rms, rme - rms);
4143 	if (seg1 == NULL) {
4144 		err = got_error_from_errno("strndup");
4145 		goto done;
4146 	}
4147 	seg2 = strdup(exstr + rme);
4148 	if (seg2 == NULL) {
4149 		err = got_error_from_errno("strndup");
4150 		goto done;
4151 	}
4152 
4153 	/* draw up to matched token if we haven't scrolled past it */
4154 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4155 	    col_tab_align, 1);
4156 	if (err)
4157 		goto done;
4158 	n = MAX(width0 - skipcol, 0);
4159 	if (n) {
4160 		free(wline);
4161 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4162 		    wlimit, col_tab_align, 1);
4163 		if (err)
4164 			goto done;
4165 		waddwstr(window, &wline[scrollx]);
4166 		wlimit -= width;
4167 		*wtotal += width;
4168 	}
4169 
4170 	if (wlimit > 0) {
4171 		int i = 0, w = 0;
4172 		size_t wlen;
4173 
4174 		free(wline);
4175 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4176 		    col_tab_align, 1);
4177 		if (err)
4178 			goto done;
4179 		wlen = wcslen(wline);
4180 		while (i < wlen) {
4181 			width = wcwidth(wline[i]);
4182 			if (width == -1) {
4183 				/* should not happen, tabs are expanded */
4184 				err = got_error(GOT_ERR_RANGE);
4185 				goto done;
4186 			}
4187 			if (width0 + w + width > skipcol)
4188 				break;
4189 			w += width;
4190 			i++;
4191 		}
4192 		/* draw (visible part of) matched token (if scrolled into it) */
4193 		if (width1 - w > 0) {
4194 			wattron(window, A_STANDOUT);
4195 			waddwstr(window, &wline[i]);
4196 			wattroff(window, A_STANDOUT);
4197 			wlimit -= (width1 - w);
4198 			*wtotal += (width1 - w);
4199 		}
4200 	}
4201 
4202 	if (wlimit > 0) {  /* draw rest of line */
4203 		free(wline);
4204 		if (skipcol > width0 + width1) {
4205 			err = format_line(&wline, &width2, &scrollx, seg2,
4206 			    skipcol - (width0 + width1), wlimit,
4207 			    col_tab_align, 1);
4208 			if (err)
4209 				goto done;
4210 			waddwstr(window, &wline[scrollx]);
4211 		} else {
4212 			err = format_line(&wline, &width2, NULL, seg2, 0,
4213 			    wlimit, col_tab_align, 1);
4214 			if (err)
4215 				goto done;
4216 			waddwstr(window, wline);
4217 		}
4218 		*wtotal += width2;
4219 	}
4220 done:
4221 	free(wline);
4222 	free(exstr);
4223 	free(seg0);
4224 	free(seg1);
4225 	free(seg2);
4226 	return err;
4227 }
4228 
4229 static int
4230 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4231 {
4232 	FILE	*f = NULL;
4233 	int	*eof, *first, *selected;
4234 
4235 	if (view->type == TOG_VIEW_DIFF) {
4236 		struct tog_diff_view_state *s = &view->state.diff;
4237 
4238 		first = &s->first_displayed_line;
4239 		selected = first;
4240 		eof = &s->eof;
4241 		f = s->f;
4242 	} else if (view->type == TOG_VIEW_HELP) {
4243 		struct tog_help_view_state *s = &view->state.help;
4244 
4245 		first = &s->first_displayed_line;
4246 		selected = first;
4247 		eof = &s->eof;
4248 		f = s->f;
4249 	} else if (view->type == TOG_VIEW_BLAME) {
4250 		struct tog_blame_view_state *s = &view->state.blame;
4251 
4252 		first = &s->first_displayed_line;
4253 		selected = &s->selected_line;
4254 		eof = &s->eof;
4255 		f = s->blame.f;
4256 	} else
4257 		return 0;
4258 
4259 	/* Center gline in the middle of the page like vi(1). */
4260 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4261 		return 0;
4262 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4263 		rewind(f);
4264 		*eof = 0;
4265 		*first = 1;
4266 		*lineno = 0;
4267 		*nprinted = 0;
4268 		return 0;
4269 	}
4270 
4271 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4272 		view->gline : (view->nlines - 3) / 2 + 1;
4273 	view->gline = 0;
4274 
4275 	return 1;
4276 }
4277 
4278 static const struct got_error *
4279 draw_file(struct tog_view *view, const char *header)
4280 {
4281 	struct tog_diff_view_state *s = &view->state.diff;
4282 	regmatch_t *regmatch = &view->regmatch;
4283 	const struct got_error *err;
4284 	int nprinted = 0;
4285 	char *line;
4286 	size_t linesize = 0;
4287 	ssize_t linelen;
4288 	wchar_t *wline;
4289 	int width;
4290 	int max_lines = view->nlines;
4291 	int nlines = s->nlines;
4292 	off_t line_offset;
4293 
4294 	s->lineno = s->first_displayed_line - 1;
4295 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4296 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4297 		return got_error_from_errno("fseek");
4298 
4299 	werase(view->window);
4300 
4301 	if (view->gline > s->nlines - 1)
4302 		view->gline = s->nlines - 1;
4303 
4304 	if (header) {
4305 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4306 		    1 : view->gline - (view->nlines - 3) / 2 :
4307 		    s->lineno + s->selected_line;
4308 
4309 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4310 			return got_error_from_errno("asprintf");
4311 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4312 		    0, 0);
4313 		free(line);
4314 		if (err)
4315 			return err;
4316 
4317 		if (view_needs_focus_indication(view))
4318 			wstandout(view->window);
4319 		waddwstr(view->window, wline);
4320 		free(wline);
4321 		wline = NULL;
4322 		while (width++ < view->ncols)
4323 			waddch(view->window, ' ');
4324 		if (view_needs_focus_indication(view))
4325 			wstandend(view->window);
4326 
4327 		if (max_lines <= 1)
4328 			return NULL;
4329 		max_lines--;
4330 	}
4331 
4332 	s->eof = 0;
4333 	view->maxx = 0;
4334 	line = NULL;
4335 	while (max_lines > 0 && nprinted < max_lines) {
4336 		enum got_diff_line_type linetype;
4337 		attr_t attr = 0;
4338 
4339 		linelen = getline(&line, &linesize, s->f);
4340 		if (linelen == -1) {
4341 			if (feof(s->f)) {
4342 				s->eof = 1;
4343 				break;
4344 			}
4345 			free(line);
4346 			return got_ferror(s->f, GOT_ERR_IO);
4347 		}
4348 
4349 		if (++s->lineno < s->first_displayed_line)
4350 			continue;
4351 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4352 			continue;
4353 		if (s->lineno == view->hiline)
4354 			attr = A_STANDOUT;
4355 
4356 		/* Set view->maxx based on full line length. */
4357 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4358 		    view->x ? 1 : 0);
4359 		if (err) {
4360 			free(line);
4361 			return err;
4362 		}
4363 		view->maxx = MAX(view->maxx, width);
4364 		free(wline);
4365 		wline = NULL;
4366 
4367 		linetype = s->lines[s->lineno].type;
4368 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4369 		    linetype < GOT_DIFF_LINE_CONTEXT)
4370 			attr |= COLOR_PAIR(linetype);
4371 		if (attr)
4372 			wattron(view->window, attr);
4373 		if (s->first_displayed_line + nprinted == s->matched_line &&
4374 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4375 			err = add_matched_line(&width, line, view->ncols, 0,
4376 			    view->window, view->x, regmatch);
4377 			if (err) {
4378 				free(line);
4379 				return err;
4380 			}
4381 		} else {
4382 			int skip;
4383 			err = format_line(&wline, &width, &skip, line,
4384 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4385 			if (err) {
4386 				free(line);
4387 				return err;
4388 			}
4389 			waddwstr(view->window, &wline[skip]);
4390 			free(wline);
4391 			wline = NULL;
4392 		}
4393 		if (s->lineno == view->hiline) {
4394 			/* highlight full gline length */
4395 			while (width++ < view->ncols)
4396 				waddch(view->window, ' ');
4397 		} else {
4398 			if (width <= view->ncols - 1)
4399 				waddch(view->window, '\n');
4400 		}
4401 		if (attr)
4402 			wattroff(view->window, attr);
4403 		if (++nprinted == 1)
4404 			s->first_displayed_line = s->lineno;
4405 	}
4406 	free(line);
4407 	if (nprinted >= 1)
4408 		s->last_displayed_line = s->first_displayed_line +
4409 		    (nprinted - 1);
4410 	else
4411 		s->last_displayed_line = s->first_displayed_line;
4412 
4413 	view_border(view);
4414 
4415 	if (s->eof) {
4416 		while (nprinted < view->nlines) {
4417 			waddch(view->window, '\n');
4418 			nprinted++;
4419 		}
4420 
4421 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4422 		    view->ncols, 0, 0);
4423 		if (err) {
4424 			return err;
4425 		}
4426 
4427 		wstandout(view->window);
4428 		waddwstr(view->window, wline);
4429 		free(wline);
4430 		wline = NULL;
4431 		wstandend(view->window);
4432 	}
4433 
4434 	return NULL;
4435 }
4436 
4437 static char *
4438 get_datestr(time_t *time, char *datebuf)
4439 {
4440 	struct tm mytm, *tm;
4441 	char *p, *s;
4442 
4443 	tm = gmtime_r(time, &mytm);
4444 	if (tm == NULL)
4445 		return NULL;
4446 	s = asctime_r(tm, datebuf);
4447 	if (s == NULL)
4448 		return NULL;
4449 	p = strchr(s, '\n');
4450 	if (p)
4451 		*p = '\0';
4452 	return s;
4453 }
4454 
4455 static const struct got_error *
4456 get_changed_paths(struct got_pathlist_head *paths,
4457     struct got_commit_object *commit, struct got_repository *repo)
4458 {
4459 	const struct got_error *err = NULL;
4460 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4461 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4462 	struct got_object_qid *qid;
4463 
4464 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4465 	if (qid != NULL) {
4466 		struct got_commit_object *pcommit;
4467 		err = got_object_open_as_commit(&pcommit, repo,
4468 		    &qid->id);
4469 		if (err)
4470 			return err;
4471 
4472 		tree_id1 = got_object_id_dup(
4473 		    got_object_commit_get_tree_id(pcommit));
4474 		if (tree_id1 == NULL) {
4475 			got_object_commit_close(pcommit);
4476 			return got_error_from_errno("got_object_id_dup");
4477 		}
4478 		got_object_commit_close(pcommit);
4479 
4480 	}
4481 
4482 	if (tree_id1) {
4483 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4484 		if (err)
4485 			goto done;
4486 	}
4487 
4488 	tree_id2 = got_object_commit_get_tree_id(commit);
4489 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4490 	if (err)
4491 		goto done;
4492 
4493 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4494 	    got_diff_tree_collect_changed_paths, paths, 0);
4495 done:
4496 	if (tree1)
4497 		got_object_tree_close(tree1);
4498 	if (tree2)
4499 		got_object_tree_close(tree2);
4500 	free(tree_id1);
4501 	return err;
4502 }
4503 
4504 static const struct got_error *
4505 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4506     off_t off, uint8_t type)
4507 {
4508 	struct got_diff_line *p;
4509 
4510 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4511 	if (p == NULL)
4512 		return got_error_from_errno("reallocarray");
4513 	*lines = p;
4514 	(*lines)[*nlines].offset = off;
4515 	(*lines)[*nlines].type = type;
4516 	(*nlines)++;
4517 
4518 	return NULL;
4519 }
4520 
4521 static const struct got_error *
4522 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4523     struct got_object_id *commit_id, struct got_reflist_head *refs,
4524     struct got_repository *repo, FILE *outfile)
4525 {
4526 	const struct got_error *err = NULL;
4527 	char datebuf[26], *datestr;
4528 	struct got_commit_object *commit;
4529 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4530 	time_t committer_time;
4531 	const char *author, *committer;
4532 	char *refs_str = NULL;
4533 	struct got_pathlist_head changed_paths;
4534 	struct got_pathlist_entry *pe;
4535 	off_t outoff = 0;
4536 	int n;
4537 
4538 	TAILQ_INIT(&changed_paths);
4539 
4540 	if (refs) {
4541 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4542 		if (err)
4543 			return err;
4544 	}
4545 
4546 	err = got_object_open_as_commit(&commit, repo, commit_id);
4547 	if (err)
4548 		return err;
4549 
4550 	err = got_object_id_str(&id_str, commit_id);
4551 	if (err) {
4552 		err = got_error_from_errno("got_object_id_str");
4553 		goto done;
4554 	}
4555 
4556 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4557 	if (err)
4558 		goto done;
4559 
4560 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4561 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4562 	if (n < 0) {
4563 		err = got_error_from_errno("fprintf");
4564 		goto done;
4565 	}
4566 	outoff += n;
4567 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4568 	if (err)
4569 		goto done;
4570 
4571 	n = fprintf(outfile, "from: %s\n",
4572 	    got_object_commit_get_author(commit));
4573 	if (n < 0) {
4574 		err = got_error_from_errno("fprintf");
4575 		goto done;
4576 	}
4577 	outoff += n;
4578 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4579 	if (err)
4580 		goto done;
4581 
4582 	committer_time = got_object_commit_get_committer_time(commit);
4583 	datestr = get_datestr(&committer_time, datebuf);
4584 	if (datestr) {
4585 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4586 		if (n < 0) {
4587 			err = got_error_from_errno("fprintf");
4588 			goto done;
4589 		}
4590 		outoff += n;
4591 		err = add_line_metadata(lines, nlines, outoff,
4592 		    GOT_DIFF_LINE_DATE);
4593 		if (err)
4594 			goto done;
4595 	}
4596 	author = got_object_commit_get_author(commit);
4597 	committer = got_object_commit_get_committer(commit);
4598 	if (strcmp(author, committer) != 0) {
4599 		n = fprintf(outfile, "via: %s\n", committer);
4600 		if (n < 0) {
4601 			err = got_error_from_errno("fprintf");
4602 			goto done;
4603 		}
4604 		outoff += n;
4605 		err = add_line_metadata(lines, nlines, outoff,
4606 		    GOT_DIFF_LINE_AUTHOR);
4607 		if (err)
4608 			goto done;
4609 	}
4610 	if (got_object_commit_get_nparents(commit) > 1) {
4611 		const struct got_object_id_queue *parent_ids;
4612 		struct got_object_qid *qid;
4613 		int pn = 1;
4614 		parent_ids = got_object_commit_get_parent_ids(commit);
4615 		STAILQ_FOREACH(qid, parent_ids, entry) {
4616 			err = got_object_id_str(&id_str, &qid->id);
4617 			if (err)
4618 				goto done;
4619 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4620 			if (n < 0) {
4621 				err = got_error_from_errno("fprintf");
4622 				goto done;
4623 			}
4624 			outoff += n;
4625 			err = add_line_metadata(lines, nlines, outoff,
4626 			    GOT_DIFF_LINE_META);
4627 			if (err)
4628 				goto done;
4629 			free(id_str);
4630 			id_str = NULL;
4631 		}
4632 	}
4633 
4634 	err = got_object_commit_get_logmsg(&logmsg, commit);
4635 	if (err)
4636 		goto done;
4637 	s = logmsg;
4638 	while ((line = strsep(&s, "\n")) != NULL) {
4639 		n = fprintf(outfile, "%s\n", line);
4640 		if (n < 0) {
4641 			err = got_error_from_errno("fprintf");
4642 			goto done;
4643 		}
4644 		outoff += n;
4645 		err = add_line_metadata(lines, nlines, outoff,
4646 		    GOT_DIFF_LINE_LOGMSG);
4647 		if (err)
4648 			goto done;
4649 	}
4650 
4651 	err = get_changed_paths(&changed_paths, commit, repo);
4652 	if (err)
4653 		goto done;
4654 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4655 		struct got_diff_changed_path *cp = pe->data;
4656 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4657 		if (n < 0) {
4658 			err = got_error_from_errno("fprintf");
4659 			goto done;
4660 		}
4661 		outoff += n;
4662 		err = add_line_metadata(lines, nlines, outoff,
4663 		    GOT_DIFF_LINE_CHANGES);
4664 		if (err)
4665 			goto done;
4666 		free((char *)pe->path);
4667 		free(pe->data);
4668 	}
4669 
4670 	fputc('\n', outfile);
4671 	outoff++;
4672 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4673 done:
4674 	got_pathlist_free(&changed_paths);
4675 	free(id_str);
4676 	free(logmsg);
4677 	free(refs_str);
4678 	got_object_commit_close(commit);
4679 	if (err) {
4680 		free(*lines);
4681 		*lines = NULL;
4682 		*nlines = 0;
4683 	}
4684 	return err;
4685 }
4686 
4687 static const struct got_error *
4688 create_diff(struct tog_diff_view_state *s)
4689 {
4690 	const struct got_error *err = NULL;
4691 	FILE *f = NULL;
4692 	int obj_type;
4693 
4694 	free(s->lines);
4695 	s->lines = malloc(sizeof(*s->lines));
4696 	if (s->lines == NULL)
4697 		return got_error_from_errno("malloc");
4698 	s->nlines = 0;
4699 
4700 	f = got_opentemp();
4701 	if (f == NULL) {
4702 		err = got_error_from_errno("got_opentemp");
4703 		goto done;
4704 	}
4705 	if (s->f && fclose(s->f) == EOF) {
4706 		err = got_error_from_errno("fclose");
4707 		goto done;
4708 	}
4709 	s->f = f;
4710 
4711 	if (s->id1)
4712 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4713 	else
4714 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4715 	if (err)
4716 		goto done;
4717 
4718 	switch (obj_type) {
4719 	case GOT_OBJ_TYPE_BLOB:
4720 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4721 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4722 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4723 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4724 		break;
4725 	case GOT_OBJ_TYPE_TREE:
4726 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4727 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4728 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4729 		    s->force_text_diff, s->repo, s->f);
4730 		break;
4731 	case GOT_OBJ_TYPE_COMMIT: {
4732 		const struct got_object_id_queue *parent_ids;
4733 		struct got_object_qid *pid;
4734 		struct got_commit_object *commit2;
4735 		struct got_reflist_head *refs;
4736 
4737 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4738 		if (err)
4739 			goto done;
4740 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4741 		/* Show commit info if we're diffing to a parent/root commit. */
4742 		if (s->id1 == NULL) {
4743 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4744 			    refs, s->repo, s->f);
4745 			if (err)
4746 				goto done;
4747 		} else {
4748 			parent_ids = got_object_commit_get_parent_ids(commit2);
4749 			STAILQ_FOREACH(pid, parent_ids, entry) {
4750 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4751 					err = write_commit_info(&s->lines,
4752 					    &s->nlines, s->id2, refs, s->repo,
4753 					    s->f);
4754 					if (err)
4755 						goto done;
4756 					break;
4757 				}
4758 			}
4759 		}
4760 		got_object_commit_close(commit2);
4761 
4762 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4763 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4764 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4765 		    s->force_text_diff, s->repo, s->f);
4766 		break;
4767 	}
4768 	default:
4769 		err = got_error(GOT_ERR_OBJ_TYPE);
4770 		break;
4771 	}
4772 done:
4773 	if (s->f && fflush(s->f) != 0 && err == NULL)
4774 		err = got_error_from_errno("fflush");
4775 	return err;
4776 }
4777 
4778 static void
4779 diff_view_indicate_progress(struct tog_view *view)
4780 {
4781 	mvwaddstr(view->window, 0, 0, "diffing...");
4782 	update_panels();
4783 	doupdate();
4784 }
4785 
4786 static const struct got_error *
4787 search_start_diff_view(struct tog_view *view)
4788 {
4789 	struct tog_diff_view_state *s = &view->state.diff;
4790 
4791 	s->matched_line = 0;
4792 	return NULL;
4793 }
4794 
4795 static void
4796 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4797     size_t *nlines, int **first, int **last, int **match, int **selected)
4798 {
4799 	struct tog_diff_view_state *s = &view->state.diff;
4800 
4801 	*f = s->f;
4802 	*nlines = s->nlines;
4803 	*line_offsets = NULL;
4804 	*match = &s->matched_line;
4805 	*first = &s->first_displayed_line;
4806 	*last = &s->last_displayed_line;
4807 	*selected = &s->selected_line;
4808 }
4809 
4810 static const struct got_error *
4811 search_next_view_match(struct tog_view *view)
4812 {
4813 	const struct got_error *err = NULL;
4814 	FILE *f;
4815 	int lineno;
4816 	char *line = NULL;
4817 	size_t linesize = 0;
4818 	ssize_t linelen;
4819 	off_t *line_offsets;
4820 	size_t nlines = 0;
4821 	int *first, *last, *match, *selected;
4822 
4823 	if (!view->search_setup)
4824 		return got_error_msg(GOT_ERR_NOT_IMPL,
4825 		    "view search not supported");
4826 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4827 	    &match, &selected);
4828 
4829 	if (!view->searching) {
4830 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4831 		return NULL;
4832 	}
4833 
4834 	if (*match) {
4835 		if (view->searching == TOG_SEARCH_FORWARD)
4836 			lineno = *match + 1;
4837 		else
4838 			lineno = *match - 1;
4839 	} else
4840 		lineno = *first - 1 + *selected;
4841 
4842 	while (1) {
4843 		off_t offset;
4844 
4845 		if (lineno <= 0 || lineno > nlines) {
4846 			if (*match == 0) {
4847 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4848 				break;
4849 			}
4850 
4851 			if (view->searching == TOG_SEARCH_FORWARD)
4852 				lineno = 1;
4853 			else
4854 				lineno = nlines;
4855 		}
4856 
4857 		offset = view->type == TOG_VIEW_DIFF ?
4858 		    view->state.diff.lines[lineno - 1].offset :
4859 		    line_offsets[lineno - 1];
4860 		if (fseeko(f, offset, SEEK_SET) != 0) {
4861 			free(line);
4862 			return got_error_from_errno("fseeko");
4863 		}
4864 		linelen = getline(&line, &linesize, f);
4865 		if (linelen != -1) {
4866 			char *exstr;
4867 			err = expand_tab(&exstr, line);
4868 			if (err)
4869 				break;
4870 			if (match_line(exstr, &view->regex, 1,
4871 			    &view->regmatch)) {
4872 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4873 				*match = lineno;
4874 				free(exstr);
4875 				break;
4876 			}
4877 			free(exstr);
4878 		}
4879 		if (view->searching == TOG_SEARCH_FORWARD)
4880 			lineno++;
4881 		else
4882 			lineno--;
4883 	}
4884 	free(line);
4885 
4886 	if (*match) {
4887 		*first = *match;
4888 		*selected = 1;
4889 	}
4890 
4891 	return err;
4892 }
4893 
4894 static const struct got_error *
4895 close_diff_view(struct tog_view *view)
4896 {
4897 	const struct got_error *err = NULL;
4898 	struct tog_diff_view_state *s = &view->state.diff;
4899 
4900 	free(s->id1);
4901 	s->id1 = NULL;
4902 	free(s->id2);
4903 	s->id2 = NULL;
4904 	if (s->f && fclose(s->f) == EOF)
4905 		err = got_error_from_errno("fclose");
4906 	s->f = NULL;
4907 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4908 		err = got_error_from_errno("fclose");
4909 	s->f1 = NULL;
4910 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4911 		err = got_error_from_errno("fclose");
4912 	s->f2 = NULL;
4913 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4914 		err = got_error_from_errno("close");
4915 	s->fd1 = -1;
4916 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4917 		err = got_error_from_errno("close");
4918 	s->fd2 = -1;
4919 	free(s->lines);
4920 	s->lines = NULL;
4921 	s->nlines = 0;
4922 	return err;
4923 }
4924 
4925 static const struct got_error *
4926 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4927     struct got_object_id *id2, const char *label1, const char *label2,
4928     int diff_context, int ignore_whitespace, int force_text_diff,
4929     struct tog_view *parent_view, struct got_repository *repo)
4930 {
4931 	const struct got_error *err;
4932 	struct tog_diff_view_state *s = &view->state.diff;
4933 
4934 	memset(s, 0, sizeof(*s));
4935 	s->fd1 = -1;
4936 	s->fd2 = -1;
4937 
4938 	if (id1 != NULL && id2 != NULL) {
4939 	    int type1, type2;
4940 	    err = got_object_get_type(&type1, repo, id1);
4941 	    if (err)
4942 		return err;
4943 	    err = got_object_get_type(&type2, repo, id2);
4944 	    if (err)
4945 		return err;
4946 
4947 	    if (type1 != type2)
4948 		return got_error(GOT_ERR_OBJ_TYPE);
4949 	}
4950 	s->first_displayed_line = 1;
4951 	s->last_displayed_line = view->nlines;
4952 	s->selected_line = 1;
4953 	s->repo = repo;
4954 	s->id1 = id1;
4955 	s->id2 = id2;
4956 	s->label1 = label1;
4957 	s->label2 = label2;
4958 
4959 	if (id1) {
4960 		s->id1 = got_object_id_dup(id1);
4961 		if (s->id1 == NULL)
4962 			return got_error_from_errno("got_object_id_dup");
4963 	} else
4964 		s->id1 = NULL;
4965 
4966 	s->id2 = got_object_id_dup(id2);
4967 	if (s->id2 == NULL) {
4968 		err = got_error_from_errno("got_object_id_dup");
4969 		goto done;
4970 	}
4971 
4972 	s->f1 = got_opentemp();
4973 	if (s->f1 == NULL) {
4974 		err = got_error_from_errno("got_opentemp");
4975 		goto done;
4976 	}
4977 
4978 	s->f2 = got_opentemp();
4979 	if (s->f2 == NULL) {
4980 		err = got_error_from_errno("got_opentemp");
4981 		goto done;
4982 	}
4983 
4984 	s->fd1 = got_opentempfd();
4985 	if (s->fd1 == -1) {
4986 		err = got_error_from_errno("got_opentempfd");
4987 		goto done;
4988 	}
4989 
4990 	s->fd2 = got_opentempfd();
4991 	if (s->fd2 == -1) {
4992 		err = got_error_from_errno("got_opentempfd");
4993 		goto done;
4994 	}
4995 
4996 	s->first_displayed_line = 1;
4997 	s->last_displayed_line = view->nlines;
4998 	s->diff_context = diff_context;
4999 	s->ignore_whitespace = ignore_whitespace;
5000 	s->force_text_diff = force_text_diff;
5001 	s->parent_view = parent_view;
5002 	s->repo = repo;
5003 
5004 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5005 		int rc;
5006 
5007 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5008 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5009 		if (rc != ERR)
5010 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5011 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5012 		if (rc != ERR)
5013 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5014 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5015 		if (rc != ERR)
5016 			rc = init_pair(GOT_DIFF_LINE_META,
5017 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5018 		if (rc != ERR)
5019 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5020 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5021 		if (rc != ERR)
5022 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5023 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5024 		if (rc != ERR)
5025 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5026 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5027 		if (rc != ERR)
5028 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5029 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5030 		if (rc != ERR)
5031 			rc = init_pair(GOT_DIFF_LINE_DATE,
5032 			    get_color_value("TOG_COLOR_DATE"), -1);
5033 		if (rc == ERR) {
5034 			err = got_error(GOT_ERR_RANGE);
5035 			goto done;
5036 		}
5037 	}
5038 
5039 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5040 	    view_is_splitscreen(view))
5041 		show_log_view(parent_view); /* draw border */
5042 	diff_view_indicate_progress(view);
5043 
5044 	err = create_diff(s);
5045 
5046 	view->show = show_diff_view;
5047 	view->input = input_diff_view;
5048 	view->reset = reset_diff_view;
5049 	view->close = close_diff_view;
5050 	view->search_start = search_start_diff_view;
5051 	view->search_setup = search_setup_diff_view;
5052 	view->search_next = search_next_view_match;
5053 done:
5054 	if (err)
5055 		close_diff_view(view);
5056 	return err;
5057 }
5058 
5059 static const struct got_error *
5060 show_diff_view(struct tog_view *view)
5061 {
5062 	const struct got_error *err;
5063 	struct tog_diff_view_state *s = &view->state.diff;
5064 	char *id_str1 = NULL, *id_str2, *header;
5065 	const char *label1, *label2;
5066 
5067 	if (s->id1) {
5068 		err = got_object_id_str(&id_str1, s->id1);
5069 		if (err)
5070 			return err;
5071 		label1 = s->label1 ? s->label1 : id_str1;
5072 	} else
5073 		label1 = "/dev/null";
5074 
5075 	err = got_object_id_str(&id_str2, s->id2);
5076 	if (err)
5077 		return err;
5078 	label2 = s->label2 ? s->label2 : id_str2;
5079 
5080 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5081 		err = got_error_from_errno("asprintf");
5082 		free(id_str1);
5083 		free(id_str2);
5084 		return err;
5085 	}
5086 	free(id_str1);
5087 	free(id_str2);
5088 
5089 	err = draw_file(view, header);
5090 	free(header);
5091 	return err;
5092 }
5093 
5094 static const struct got_error *
5095 set_selected_commit(struct tog_diff_view_state *s,
5096     struct commit_queue_entry *entry)
5097 {
5098 	const struct got_error *err;
5099 	const struct got_object_id_queue *parent_ids;
5100 	struct got_commit_object *selected_commit;
5101 	struct got_object_qid *pid;
5102 
5103 	free(s->id2);
5104 	s->id2 = got_object_id_dup(entry->id);
5105 	if (s->id2 == NULL)
5106 		return got_error_from_errno("got_object_id_dup");
5107 
5108 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5109 	if (err)
5110 		return err;
5111 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5112 	free(s->id1);
5113 	pid = STAILQ_FIRST(parent_ids);
5114 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5115 	got_object_commit_close(selected_commit);
5116 	return NULL;
5117 }
5118 
5119 static const struct got_error *
5120 reset_diff_view(struct tog_view *view)
5121 {
5122 	struct tog_diff_view_state *s = &view->state.diff;
5123 
5124 	view->count = 0;
5125 	wclear(view->window);
5126 	s->first_displayed_line = 1;
5127 	s->last_displayed_line = view->nlines;
5128 	s->matched_line = 0;
5129 	diff_view_indicate_progress(view);
5130 	return create_diff(s);
5131 }
5132 
5133 static void
5134 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5135 {
5136 	int start, i;
5137 
5138 	i = start = s->first_displayed_line - 1;
5139 
5140 	while (s->lines[i].type != type) {
5141 		if (i == 0)
5142 			i = s->nlines - 1;
5143 		if (--i == start)
5144 			return; /* do nothing, requested type not in file */
5145 	}
5146 
5147 	s->selected_line = 1;
5148 	s->first_displayed_line = i;
5149 }
5150 
5151 static void
5152 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5153 {
5154 	int start, i;
5155 
5156 	i = start = s->first_displayed_line + 1;
5157 
5158 	while (s->lines[i].type != type) {
5159 		if (i == s->nlines - 1)
5160 			i = 0;
5161 		if (++i == start)
5162 			return; /* do nothing, requested type not in file */
5163 	}
5164 
5165 	s->selected_line = 1;
5166 	s->first_displayed_line = i;
5167 }
5168 
5169 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5170     int, int, int);
5171 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5172     int, int);
5173 
5174 static const struct got_error *
5175 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5176 {
5177 	const struct got_error *err = NULL;
5178 	struct tog_diff_view_state *s = &view->state.diff;
5179 	struct tog_log_view_state *ls;
5180 	struct commit_queue_entry *old_selected_entry;
5181 	char *line = NULL;
5182 	size_t linesize = 0;
5183 	ssize_t linelen;
5184 	int i, nscroll = view->nlines - 1, up = 0;
5185 
5186 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5187 
5188 	switch (ch) {
5189 	case '0':
5190 		view->x = 0;
5191 		break;
5192 	case '$':
5193 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5194 		view->count = 0;
5195 		break;
5196 	case KEY_RIGHT:
5197 	case 'l':
5198 		if (view->x + view->ncols / 3 < view->maxx)
5199 			view->x += 2;  /* move two columns right */
5200 		else
5201 			view->count = 0;
5202 		break;
5203 	case KEY_LEFT:
5204 	case 'h':
5205 		view->x -= MIN(view->x, 2);  /* move two columns back */
5206 		if (view->x <= 0)
5207 			view->count = 0;
5208 		break;
5209 	case 'a':
5210 	case 'w':
5211 		if (ch == 'a')
5212 			s->force_text_diff = !s->force_text_diff;
5213 		if (ch == 'w')
5214 			s->ignore_whitespace = !s->ignore_whitespace;
5215 		err = reset_diff_view(view);
5216 		break;
5217 	case 'g':
5218 	case KEY_HOME:
5219 		s->first_displayed_line = 1;
5220 		view->count = 0;
5221 		break;
5222 	case 'G':
5223 	case KEY_END:
5224 		view->count = 0;
5225 		if (s->eof)
5226 			break;
5227 
5228 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5229 		s->eof = 1;
5230 		break;
5231 	case 'k':
5232 	case KEY_UP:
5233 	case CTRL('p'):
5234 		if (s->first_displayed_line > 1)
5235 			s->first_displayed_line--;
5236 		else
5237 			view->count = 0;
5238 		break;
5239 	case CTRL('u'):
5240 	case 'u':
5241 		nscroll /= 2;
5242 		/* FALL THROUGH */
5243 	case KEY_PPAGE:
5244 	case CTRL('b'):
5245 	case 'b':
5246 		if (s->first_displayed_line == 1) {
5247 			view->count = 0;
5248 			break;
5249 		}
5250 		i = 0;
5251 		while (i++ < nscroll && s->first_displayed_line > 1)
5252 			s->first_displayed_line--;
5253 		break;
5254 	case 'j':
5255 	case KEY_DOWN:
5256 	case CTRL('n'):
5257 		if (!s->eof)
5258 			s->first_displayed_line++;
5259 		else
5260 			view->count = 0;
5261 		break;
5262 	case CTRL('d'):
5263 	case 'd':
5264 		nscroll /= 2;
5265 		/* FALL THROUGH */
5266 	case KEY_NPAGE:
5267 	case CTRL('f'):
5268 	case 'f':
5269 	case ' ':
5270 		if (s->eof) {
5271 			view->count = 0;
5272 			break;
5273 		}
5274 		i = 0;
5275 		while (!s->eof && i++ < nscroll) {
5276 			linelen = getline(&line, &linesize, s->f);
5277 			s->first_displayed_line++;
5278 			if (linelen == -1) {
5279 				if (feof(s->f)) {
5280 					s->eof = 1;
5281 				} else
5282 					err = got_ferror(s->f, GOT_ERR_IO);
5283 				break;
5284 			}
5285 		}
5286 		free(line);
5287 		break;
5288 	case '(':
5289 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5290 		break;
5291 	case ')':
5292 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5293 		break;
5294 	case '{':
5295 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5296 		break;
5297 	case '}':
5298 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5299 		break;
5300 	case '[':
5301 		if (s->diff_context > 0) {
5302 			s->diff_context--;
5303 			s->matched_line = 0;
5304 			diff_view_indicate_progress(view);
5305 			err = create_diff(s);
5306 			if (s->first_displayed_line + view->nlines - 1 >
5307 			    s->nlines) {
5308 				s->first_displayed_line = 1;
5309 				s->last_displayed_line = view->nlines;
5310 			}
5311 		} else
5312 			view->count = 0;
5313 		break;
5314 	case ']':
5315 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5316 			s->diff_context++;
5317 			s->matched_line = 0;
5318 			diff_view_indicate_progress(view);
5319 			err = create_diff(s);
5320 		} else
5321 			view->count = 0;
5322 		break;
5323 	case '<':
5324 	case ',':
5325 	case 'K':
5326 		up = 1;
5327 		/* FALL THROUGH */
5328 	case '>':
5329 	case '.':
5330 	case 'J':
5331 		if (s->parent_view == NULL) {
5332 			view->count = 0;
5333 			break;
5334 		}
5335 		s->parent_view->count = view->count;
5336 
5337 		if (s->parent_view->type == TOG_VIEW_LOG) {
5338 			ls = &s->parent_view->state.log;
5339 			old_selected_entry = ls->selected_entry;
5340 
5341 			err = input_log_view(NULL, s->parent_view,
5342 			    up ? KEY_UP : KEY_DOWN);
5343 			if (err)
5344 				break;
5345 			view->count = s->parent_view->count;
5346 
5347 			if (old_selected_entry == ls->selected_entry)
5348 				break;
5349 
5350 			err = set_selected_commit(s, ls->selected_entry);
5351 			if (err)
5352 				break;
5353 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5354 			struct tog_blame_view_state *bs;
5355 			struct got_object_id *id, *prev_id;
5356 
5357 			bs = &s->parent_view->state.blame;
5358 			prev_id = get_annotation_for_line(bs->blame.lines,
5359 			    bs->blame.nlines, bs->last_diffed_line);
5360 
5361 			err = input_blame_view(&view, s->parent_view,
5362 			    up ? KEY_UP : KEY_DOWN);
5363 			if (err)
5364 				break;
5365 			view->count = s->parent_view->count;
5366 
5367 			if (prev_id == NULL)
5368 				break;
5369 			id = get_selected_commit_id(bs->blame.lines,
5370 			    bs->blame.nlines, bs->first_displayed_line,
5371 			    bs->selected_line);
5372 			if (id == NULL)
5373 				break;
5374 
5375 			if (!got_object_id_cmp(prev_id, id))
5376 				break;
5377 
5378 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5379 			if (err)
5380 				break;
5381 		}
5382 		s->first_displayed_line = 1;
5383 		s->last_displayed_line = view->nlines;
5384 		s->matched_line = 0;
5385 		view->x = 0;
5386 
5387 		diff_view_indicate_progress(view);
5388 		err = create_diff(s);
5389 		break;
5390 	default:
5391 		view->count = 0;
5392 		break;
5393 	}
5394 
5395 	return err;
5396 }
5397 
5398 static const struct got_error *
5399 cmd_diff(int argc, char *argv[])
5400 {
5401 	const struct got_error *error = NULL;
5402 	struct got_repository *repo = NULL;
5403 	struct got_worktree *worktree = NULL;
5404 	struct got_object_id *id1 = NULL, *id2 = NULL;
5405 	char *repo_path = NULL, *cwd = NULL;
5406 	char *id_str1 = NULL, *id_str2 = NULL;
5407 	char *label1 = NULL, *label2 = NULL;
5408 	int diff_context = 3, ignore_whitespace = 0;
5409 	int ch, force_text_diff = 0;
5410 	const char *errstr;
5411 	struct tog_view *view;
5412 	int *pack_fds = NULL;
5413 
5414 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5415 		switch (ch) {
5416 		case 'a':
5417 			force_text_diff = 1;
5418 			break;
5419 		case 'C':
5420 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5421 			    &errstr);
5422 			if (errstr != NULL)
5423 				errx(1, "number of context lines is %s: %s",
5424 				    errstr, errstr);
5425 			break;
5426 		case 'r':
5427 			repo_path = realpath(optarg, NULL);
5428 			if (repo_path == NULL)
5429 				return got_error_from_errno2("realpath",
5430 				    optarg);
5431 			got_path_strip_trailing_slashes(repo_path);
5432 			break;
5433 		case 'w':
5434 			ignore_whitespace = 1;
5435 			break;
5436 		default:
5437 			usage_diff();
5438 			/* NOTREACHED */
5439 		}
5440 	}
5441 
5442 	argc -= optind;
5443 	argv += optind;
5444 
5445 	if (argc == 0) {
5446 		usage_diff(); /* TODO show local worktree changes */
5447 	} else if (argc == 2) {
5448 		id_str1 = argv[0];
5449 		id_str2 = argv[1];
5450 	} else
5451 		usage_diff();
5452 
5453 	error = got_repo_pack_fds_open(&pack_fds);
5454 	if (error)
5455 		goto done;
5456 
5457 	if (repo_path == NULL) {
5458 		cwd = getcwd(NULL, 0);
5459 		if (cwd == NULL)
5460 			return got_error_from_errno("getcwd");
5461 		error = got_worktree_open(&worktree, cwd);
5462 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5463 			goto done;
5464 		if (worktree)
5465 			repo_path =
5466 			    strdup(got_worktree_get_repo_path(worktree));
5467 		else
5468 			repo_path = strdup(cwd);
5469 		if (repo_path == NULL) {
5470 			error = got_error_from_errno("strdup");
5471 			goto done;
5472 		}
5473 	}
5474 
5475 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5476 	if (error)
5477 		goto done;
5478 
5479 	init_curses();
5480 
5481 	error = apply_unveil(got_repo_get_path(repo), NULL);
5482 	if (error)
5483 		goto done;
5484 
5485 	error = tog_load_refs(repo, 0);
5486 	if (error)
5487 		goto done;
5488 
5489 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5490 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5491 	if (error)
5492 		goto done;
5493 
5494 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5495 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5496 	if (error)
5497 		goto done;
5498 
5499 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5500 	if (view == NULL) {
5501 		error = got_error_from_errno("view_open");
5502 		goto done;
5503 	}
5504 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5505 	    ignore_whitespace, force_text_diff, NULL,  repo);
5506 	if (error)
5507 		goto done;
5508 	error = view_loop(view);
5509 done:
5510 	free(label1);
5511 	free(label2);
5512 	free(repo_path);
5513 	free(cwd);
5514 	if (repo) {
5515 		const struct got_error *close_err = got_repo_close(repo);
5516 		if (error == NULL)
5517 			error = close_err;
5518 	}
5519 	if (worktree)
5520 		got_worktree_close(worktree);
5521 	if (pack_fds) {
5522 		const struct got_error *pack_err =
5523 		    got_repo_pack_fds_close(pack_fds);
5524 		if (error == NULL)
5525 			error = pack_err;
5526 	}
5527 	tog_free_refs();
5528 	return error;
5529 }
5530 
5531 __dead static void
5532 usage_blame(void)
5533 {
5534 	endwin();
5535 	fprintf(stderr,
5536 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5537 	    getprogname());
5538 	exit(1);
5539 }
5540 
5541 struct tog_blame_line {
5542 	int annotated;
5543 	struct got_object_id *id;
5544 };
5545 
5546 static const struct got_error *
5547 draw_blame(struct tog_view *view)
5548 {
5549 	struct tog_blame_view_state *s = &view->state.blame;
5550 	struct tog_blame *blame = &s->blame;
5551 	regmatch_t *regmatch = &view->regmatch;
5552 	const struct got_error *err;
5553 	int lineno = 0, nprinted = 0;
5554 	char *line = NULL;
5555 	size_t linesize = 0;
5556 	ssize_t linelen;
5557 	wchar_t *wline;
5558 	int width;
5559 	struct tog_blame_line *blame_line;
5560 	struct got_object_id *prev_id = NULL;
5561 	char *id_str;
5562 	struct tog_color *tc;
5563 
5564 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5565 	if (err)
5566 		return err;
5567 
5568 	rewind(blame->f);
5569 	werase(view->window);
5570 
5571 	if (asprintf(&line, "commit %s", id_str) == -1) {
5572 		err = got_error_from_errno("asprintf");
5573 		free(id_str);
5574 		return err;
5575 	}
5576 
5577 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5578 	free(line);
5579 	line = NULL;
5580 	if (err)
5581 		return err;
5582 	if (view_needs_focus_indication(view))
5583 		wstandout(view->window);
5584 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5585 	if (tc)
5586 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5587 	waddwstr(view->window, wline);
5588 	while (width++ < view->ncols)
5589 		waddch(view->window, ' ');
5590 	if (tc)
5591 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5592 	if (view_needs_focus_indication(view))
5593 		wstandend(view->window);
5594 	free(wline);
5595 	wline = NULL;
5596 
5597 	if (view->gline > blame->nlines)
5598 		view->gline = blame->nlines;
5599 
5600 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5601 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5602 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5603 		free(id_str);
5604 		return got_error_from_errno("asprintf");
5605 	}
5606 	free(id_str);
5607 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5608 	free(line);
5609 	line = NULL;
5610 	if (err)
5611 		return err;
5612 	waddwstr(view->window, wline);
5613 	free(wline);
5614 	wline = NULL;
5615 	if (width < view->ncols - 1)
5616 		waddch(view->window, '\n');
5617 
5618 	s->eof = 0;
5619 	view->maxx = 0;
5620 	while (nprinted < view->nlines - 2) {
5621 		linelen = getline(&line, &linesize, blame->f);
5622 		if (linelen == -1) {
5623 			if (feof(blame->f)) {
5624 				s->eof = 1;
5625 				break;
5626 			}
5627 			free(line);
5628 			return got_ferror(blame->f, GOT_ERR_IO);
5629 		}
5630 		if (++lineno < s->first_displayed_line)
5631 			continue;
5632 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5633 			continue;
5634 
5635 		/* Set view->maxx based on full line length. */
5636 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5637 		if (err) {
5638 			free(line);
5639 			return err;
5640 		}
5641 		free(wline);
5642 		wline = NULL;
5643 		view->maxx = MAX(view->maxx, width);
5644 
5645 		if (nprinted == s->selected_line - 1)
5646 			wstandout(view->window);
5647 
5648 		if (blame->nlines > 0) {
5649 			blame_line = &blame->lines[lineno - 1];
5650 			if (blame_line->annotated && prev_id &&
5651 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5652 			    !(nprinted == s->selected_line - 1)) {
5653 				waddstr(view->window, "        ");
5654 			} else if (blame_line->annotated) {
5655 				char *id_str;
5656 				err = got_object_id_str(&id_str,
5657 				    blame_line->id);
5658 				if (err) {
5659 					free(line);
5660 					return err;
5661 				}
5662 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5663 				if (tc)
5664 					wattr_on(view->window,
5665 					    COLOR_PAIR(tc->colorpair), NULL);
5666 				wprintw(view->window, "%.8s", id_str);
5667 				if (tc)
5668 					wattr_off(view->window,
5669 					    COLOR_PAIR(tc->colorpair), NULL);
5670 				free(id_str);
5671 				prev_id = blame_line->id;
5672 			} else {
5673 				waddstr(view->window, "........");
5674 				prev_id = NULL;
5675 			}
5676 		} else {
5677 			waddstr(view->window, "........");
5678 			prev_id = NULL;
5679 		}
5680 
5681 		if (nprinted == s->selected_line - 1)
5682 			wstandend(view->window);
5683 		waddstr(view->window, " ");
5684 
5685 		if (view->ncols <= 9) {
5686 			width = 9;
5687 		} else if (s->first_displayed_line + nprinted ==
5688 		    s->matched_line &&
5689 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5690 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5691 			    view->window, view->x, regmatch);
5692 			if (err) {
5693 				free(line);
5694 				return err;
5695 			}
5696 			width += 9;
5697 		} else {
5698 			int skip;
5699 			err = format_line(&wline, &width, &skip, line,
5700 			    view->x, view->ncols - 9, 9, 1);
5701 			if (err) {
5702 				free(line);
5703 				return err;
5704 			}
5705 			waddwstr(view->window, &wline[skip]);
5706 			width += 9;
5707 			free(wline);
5708 			wline = NULL;
5709 		}
5710 
5711 		if (width <= view->ncols - 1)
5712 			waddch(view->window, '\n');
5713 		if (++nprinted == 1)
5714 			s->first_displayed_line = lineno;
5715 	}
5716 	free(line);
5717 	s->last_displayed_line = lineno;
5718 
5719 	view_border(view);
5720 
5721 	return NULL;
5722 }
5723 
5724 static const struct got_error *
5725 blame_cb(void *arg, int nlines, int lineno,
5726     struct got_commit_object *commit, struct got_object_id *id)
5727 {
5728 	const struct got_error *err = NULL;
5729 	struct tog_blame_cb_args *a = arg;
5730 	struct tog_blame_line *line;
5731 	int errcode;
5732 
5733 	if (nlines != a->nlines ||
5734 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5735 		return got_error(GOT_ERR_RANGE);
5736 
5737 	errcode = pthread_mutex_lock(&tog_mutex);
5738 	if (errcode)
5739 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5740 
5741 	if (*a->quit) {	/* user has quit the blame view */
5742 		err = got_error(GOT_ERR_ITER_COMPLETED);
5743 		goto done;
5744 	}
5745 
5746 	if (lineno == -1)
5747 		goto done; /* no change in this commit */
5748 
5749 	line = &a->lines[lineno - 1];
5750 	if (line->annotated)
5751 		goto done;
5752 
5753 	line->id = got_object_id_dup(id);
5754 	if (line->id == NULL) {
5755 		err = got_error_from_errno("got_object_id_dup");
5756 		goto done;
5757 	}
5758 	line->annotated = 1;
5759 done:
5760 	errcode = pthread_mutex_unlock(&tog_mutex);
5761 	if (errcode)
5762 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5763 	return err;
5764 }
5765 
5766 static void *
5767 blame_thread(void *arg)
5768 {
5769 	const struct got_error *err, *close_err;
5770 	struct tog_blame_thread_args *ta = arg;
5771 	struct tog_blame_cb_args *a = ta->cb_args;
5772 	int errcode, fd1 = -1, fd2 = -1;
5773 	FILE *f1 = NULL, *f2 = NULL;
5774 
5775 	fd1 = got_opentempfd();
5776 	if (fd1 == -1)
5777 		return (void *)got_error_from_errno("got_opentempfd");
5778 
5779 	fd2 = got_opentempfd();
5780 	if (fd2 == -1) {
5781 		err = got_error_from_errno("got_opentempfd");
5782 		goto done;
5783 	}
5784 
5785 	f1 = got_opentemp();
5786 	if (f1 == NULL) {
5787 		err = (void *)got_error_from_errno("got_opentemp");
5788 		goto done;
5789 	}
5790 	f2 = got_opentemp();
5791 	if (f2 == NULL) {
5792 		err = (void *)got_error_from_errno("got_opentemp");
5793 		goto done;
5794 	}
5795 
5796 	err = block_signals_used_by_main_thread();
5797 	if (err)
5798 		goto done;
5799 
5800 	err = got_blame(ta->path, a->commit_id, ta->repo,
5801 	    tog_diff_algo, blame_cb, ta->cb_args,
5802 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5803 	if (err && err->code == GOT_ERR_CANCELLED)
5804 		err = NULL;
5805 
5806 	errcode = pthread_mutex_lock(&tog_mutex);
5807 	if (errcode) {
5808 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5809 		goto done;
5810 	}
5811 
5812 	close_err = got_repo_close(ta->repo);
5813 	if (err == NULL)
5814 		err = close_err;
5815 	ta->repo = NULL;
5816 	*ta->complete = 1;
5817 
5818 	errcode = pthread_mutex_unlock(&tog_mutex);
5819 	if (errcode && err == NULL)
5820 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5821 
5822 done:
5823 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5824 		err = got_error_from_errno("close");
5825 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5826 		err = got_error_from_errno("close");
5827 	if (f1 && fclose(f1) == EOF && err == NULL)
5828 		err = got_error_from_errno("fclose");
5829 	if (f2 && fclose(f2) == EOF && err == NULL)
5830 		err = got_error_from_errno("fclose");
5831 
5832 	return (void *)err;
5833 }
5834 
5835 static struct got_object_id *
5836 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5837     int first_displayed_line, int selected_line)
5838 {
5839 	struct tog_blame_line *line;
5840 
5841 	if (nlines <= 0)
5842 		return NULL;
5843 
5844 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5845 	if (!line->annotated)
5846 		return NULL;
5847 
5848 	return line->id;
5849 }
5850 
5851 static struct got_object_id *
5852 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5853     int lineno)
5854 {
5855 	struct tog_blame_line *line;
5856 
5857 	if (nlines <= 0 || lineno >= nlines)
5858 		return NULL;
5859 
5860 	line = &lines[lineno - 1];
5861 	if (!line->annotated)
5862 		return NULL;
5863 
5864 	return line->id;
5865 }
5866 
5867 static const struct got_error *
5868 stop_blame(struct tog_blame *blame)
5869 {
5870 	const struct got_error *err = NULL;
5871 	int i;
5872 
5873 	if (blame->thread) {
5874 		int errcode;
5875 		errcode = pthread_mutex_unlock(&tog_mutex);
5876 		if (errcode)
5877 			return got_error_set_errno(errcode,
5878 			    "pthread_mutex_unlock");
5879 		errcode = pthread_join(blame->thread, (void **)&err);
5880 		if (errcode)
5881 			return got_error_set_errno(errcode, "pthread_join");
5882 		errcode = pthread_mutex_lock(&tog_mutex);
5883 		if (errcode)
5884 			return got_error_set_errno(errcode,
5885 			    "pthread_mutex_lock");
5886 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5887 			err = NULL;
5888 		blame->thread = NULL;
5889 	}
5890 	if (blame->thread_args.repo) {
5891 		const struct got_error *close_err;
5892 		close_err = got_repo_close(blame->thread_args.repo);
5893 		if (err == NULL)
5894 			err = close_err;
5895 		blame->thread_args.repo = NULL;
5896 	}
5897 	if (blame->f) {
5898 		if (fclose(blame->f) == EOF && err == NULL)
5899 			err = got_error_from_errno("fclose");
5900 		blame->f = NULL;
5901 	}
5902 	if (blame->lines) {
5903 		for (i = 0; i < blame->nlines; i++)
5904 			free(blame->lines[i].id);
5905 		free(blame->lines);
5906 		blame->lines = NULL;
5907 	}
5908 	free(blame->cb_args.commit_id);
5909 	blame->cb_args.commit_id = NULL;
5910 	if (blame->pack_fds) {
5911 		const struct got_error *pack_err =
5912 		    got_repo_pack_fds_close(blame->pack_fds);
5913 		if (err == NULL)
5914 			err = pack_err;
5915 		blame->pack_fds = NULL;
5916 	}
5917 	return err;
5918 }
5919 
5920 static const struct got_error *
5921 cancel_blame_view(void *arg)
5922 {
5923 	const struct got_error *err = NULL;
5924 	int *done = arg;
5925 	int errcode;
5926 
5927 	errcode = pthread_mutex_lock(&tog_mutex);
5928 	if (errcode)
5929 		return got_error_set_errno(errcode,
5930 		    "pthread_mutex_unlock");
5931 
5932 	if (*done)
5933 		err = got_error(GOT_ERR_CANCELLED);
5934 
5935 	errcode = pthread_mutex_unlock(&tog_mutex);
5936 	if (errcode)
5937 		return got_error_set_errno(errcode,
5938 		    "pthread_mutex_lock");
5939 
5940 	return err;
5941 }
5942 
5943 static const struct got_error *
5944 run_blame(struct tog_view *view)
5945 {
5946 	struct tog_blame_view_state *s = &view->state.blame;
5947 	struct tog_blame *blame = &s->blame;
5948 	const struct got_error *err = NULL;
5949 	struct got_commit_object *commit = NULL;
5950 	struct got_blob_object *blob = NULL;
5951 	struct got_repository *thread_repo = NULL;
5952 	struct got_object_id *obj_id = NULL;
5953 	int obj_type, fd = -1;
5954 	int *pack_fds = NULL;
5955 
5956 	err = got_object_open_as_commit(&commit, s->repo,
5957 	    &s->blamed_commit->id);
5958 	if (err)
5959 		return err;
5960 
5961 	fd = got_opentempfd();
5962 	if (fd == -1) {
5963 		err = got_error_from_errno("got_opentempfd");
5964 		goto done;
5965 	}
5966 
5967 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5968 	if (err)
5969 		goto done;
5970 
5971 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5972 	if (err)
5973 		goto done;
5974 
5975 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5976 		err = got_error(GOT_ERR_OBJ_TYPE);
5977 		goto done;
5978 	}
5979 
5980 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5981 	if (err)
5982 		goto done;
5983 	blame->f = got_opentemp();
5984 	if (blame->f == NULL) {
5985 		err = got_error_from_errno("got_opentemp");
5986 		goto done;
5987 	}
5988 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5989 	    &blame->line_offsets, blame->f, blob);
5990 	if (err)
5991 		goto done;
5992 	if (blame->nlines == 0) {
5993 		s->blame_complete = 1;
5994 		goto done;
5995 	}
5996 
5997 	/* Don't include \n at EOF in the blame line count. */
5998 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5999 		blame->nlines--;
6000 
6001 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6002 	if (blame->lines == NULL) {
6003 		err = got_error_from_errno("calloc");
6004 		goto done;
6005 	}
6006 
6007 	err = got_repo_pack_fds_open(&pack_fds);
6008 	if (err)
6009 		goto done;
6010 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6011 	    pack_fds);
6012 	if (err)
6013 		goto done;
6014 
6015 	blame->pack_fds = pack_fds;
6016 	blame->cb_args.view = view;
6017 	blame->cb_args.lines = blame->lines;
6018 	blame->cb_args.nlines = blame->nlines;
6019 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6020 	if (blame->cb_args.commit_id == NULL) {
6021 		err = got_error_from_errno("got_object_id_dup");
6022 		goto done;
6023 	}
6024 	blame->cb_args.quit = &s->done;
6025 
6026 	blame->thread_args.path = s->path;
6027 	blame->thread_args.repo = thread_repo;
6028 	blame->thread_args.cb_args = &blame->cb_args;
6029 	blame->thread_args.complete = &s->blame_complete;
6030 	blame->thread_args.cancel_cb = cancel_blame_view;
6031 	blame->thread_args.cancel_arg = &s->done;
6032 	s->blame_complete = 0;
6033 
6034 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6035 		s->first_displayed_line = 1;
6036 		s->last_displayed_line = view->nlines;
6037 		s->selected_line = 1;
6038 	}
6039 	s->matched_line = 0;
6040 
6041 done:
6042 	if (commit)
6043 		got_object_commit_close(commit);
6044 	if (fd != -1 && close(fd) == -1 && err == NULL)
6045 		err = got_error_from_errno("close");
6046 	if (blob)
6047 		got_object_blob_close(blob);
6048 	free(obj_id);
6049 	if (err)
6050 		stop_blame(blame);
6051 	return err;
6052 }
6053 
6054 static const struct got_error *
6055 open_blame_view(struct tog_view *view, char *path,
6056     struct got_object_id *commit_id, struct got_repository *repo)
6057 {
6058 	const struct got_error *err = NULL;
6059 	struct tog_blame_view_state *s = &view->state.blame;
6060 
6061 	STAILQ_INIT(&s->blamed_commits);
6062 
6063 	s->path = strdup(path);
6064 	if (s->path == NULL)
6065 		return got_error_from_errno("strdup");
6066 
6067 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6068 	if (err) {
6069 		free(s->path);
6070 		return err;
6071 	}
6072 
6073 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6074 	s->first_displayed_line = 1;
6075 	s->last_displayed_line = view->nlines;
6076 	s->selected_line = 1;
6077 	s->blame_complete = 0;
6078 	s->repo = repo;
6079 	s->commit_id = commit_id;
6080 	memset(&s->blame, 0, sizeof(s->blame));
6081 
6082 	STAILQ_INIT(&s->colors);
6083 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6084 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6085 		    get_color_value("TOG_COLOR_COMMIT"));
6086 		if (err)
6087 			return err;
6088 	}
6089 
6090 	view->show = show_blame_view;
6091 	view->input = input_blame_view;
6092 	view->reset = reset_blame_view;
6093 	view->close = close_blame_view;
6094 	view->search_start = search_start_blame_view;
6095 	view->search_setup = search_setup_blame_view;
6096 	view->search_next = search_next_view_match;
6097 
6098 	return run_blame(view);
6099 }
6100 
6101 static const struct got_error *
6102 close_blame_view(struct tog_view *view)
6103 {
6104 	const struct got_error *err = NULL;
6105 	struct tog_blame_view_state *s = &view->state.blame;
6106 
6107 	if (s->blame.thread)
6108 		err = stop_blame(&s->blame);
6109 
6110 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6111 		struct got_object_qid *blamed_commit;
6112 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6113 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6114 		got_object_qid_free(blamed_commit);
6115 	}
6116 
6117 	free(s->path);
6118 	free_colors(&s->colors);
6119 	return err;
6120 }
6121 
6122 static const struct got_error *
6123 search_start_blame_view(struct tog_view *view)
6124 {
6125 	struct tog_blame_view_state *s = &view->state.blame;
6126 
6127 	s->matched_line = 0;
6128 	return NULL;
6129 }
6130 
6131 static void
6132 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6133     size_t *nlines, int **first, int **last, int **match, int **selected)
6134 {
6135 	struct tog_blame_view_state *s = &view->state.blame;
6136 
6137 	*f = s->blame.f;
6138 	*nlines = s->blame.nlines;
6139 	*line_offsets = s->blame.line_offsets;
6140 	*match = &s->matched_line;
6141 	*first = &s->first_displayed_line;
6142 	*last = &s->last_displayed_line;
6143 	*selected = &s->selected_line;
6144 }
6145 
6146 static const struct got_error *
6147 show_blame_view(struct tog_view *view)
6148 {
6149 	const struct got_error *err = NULL;
6150 	struct tog_blame_view_state *s = &view->state.blame;
6151 	int errcode;
6152 
6153 	if (s->blame.thread == NULL && !s->blame_complete) {
6154 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6155 		    &s->blame.thread_args);
6156 		if (errcode)
6157 			return got_error_set_errno(errcode, "pthread_create");
6158 
6159 		halfdelay(1); /* fast refresh while annotating  */
6160 	}
6161 
6162 	if (s->blame_complete)
6163 		halfdelay(10); /* disable fast refresh */
6164 
6165 	err = draw_blame(view);
6166 
6167 	view_border(view);
6168 	return err;
6169 }
6170 
6171 static const struct got_error *
6172 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6173     struct got_repository *repo, struct got_object_id *id)
6174 {
6175 	struct tog_view		*log_view;
6176 	const struct got_error	*err = NULL;
6177 
6178 	*new_view = NULL;
6179 
6180 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6181 	if (log_view == NULL)
6182 		return got_error_from_errno("view_open");
6183 
6184 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6185 	if (err)
6186 		view_close(log_view);
6187 	else
6188 		*new_view = log_view;
6189 
6190 	return err;
6191 }
6192 
6193 static const struct got_error *
6194 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6195 {
6196 	const struct got_error *err = NULL, *thread_err = NULL;
6197 	struct tog_view *diff_view;
6198 	struct tog_blame_view_state *s = &view->state.blame;
6199 	int eos, nscroll, begin_y = 0, begin_x = 0;
6200 
6201 	eos = nscroll = view->nlines - 2;
6202 	if (view_is_hsplit_top(view))
6203 		--eos;  /* border */
6204 
6205 	switch (ch) {
6206 	case '0':
6207 		view->x = 0;
6208 		break;
6209 	case '$':
6210 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6211 		view->count = 0;
6212 		break;
6213 	case KEY_RIGHT:
6214 	case 'l':
6215 		if (view->x + view->ncols / 3 < view->maxx)
6216 			view->x += 2;  /* move two columns right */
6217 		else
6218 			view->count = 0;
6219 		break;
6220 	case KEY_LEFT:
6221 	case 'h':
6222 		view->x -= MIN(view->x, 2);  /* move two columns back */
6223 		if (view->x <= 0)
6224 			view->count = 0;
6225 		break;
6226 	case 'q':
6227 		s->done = 1;
6228 		break;
6229 	case 'g':
6230 	case KEY_HOME:
6231 		s->selected_line = 1;
6232 		s->first_displayed_line = 1;
6233 		view->count = 0;
6234 		break;
6235 	case 'G':
6236 	case KEY_END:
6237 		if (s->blame.nlines < eos) {
6238 			s->selected_line = s->blame.nlines;
6239 			s->first_displayed_line = 1;
6240 		} else {
6241 			s->selected_line = eos;
6242 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6243 		}
6244 		view->count = 0;
6245 		break;
6246 	case 'k':
6247 	case KEY_UP:
6248 	case CTRL('p'):
6249 		if (s->selected_line > 1)
6250 			s->selected_line--;
6251 		else if (s->selected_line == 1 &&
6252 		    s->first_displayed_line > 1)
6253 			s->first_displayed_line--;
6254 		else
6255 			view->count = 0;
6256 		break;
6257 	case CTRL('u'):
6258 	case 'u':
6259 		nscroll /= 2;
6260 		/* FALL THROUGH */
6261 	case KEY_PPAGE:
6262 	case CTRL('b'):
6263 	case 'b':
6264 		if (s->first_displayed_line == 1) {
6265 			if (view->count > 1)
6266 				nscroll += nscroll;
6267 			s->selected_line = MAX(1, s->selected_line - nscroll);
6268 			view->count = 0;
6269 			break;
6270 		}
6271 		if (s->first_displayed_line > nscroll)
6272 			s->first_displayed_line -= nscroll;
6273 		else
6274 			s->first_displayed_line = 1;
6275 		break;
6276 	case 'j':
6277 	case KEY_DOWN:
6278 	case CTRL('n'):
6279 		if (s->selected_line < eos && s->first_displayed_line +
6280 		    s->selected_line <= s->blame.nlines)
6281 			s->selected_line++;
6282 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6283 			s->first_displayed_line++;
6284 		else
6285 			view->count = 0;
6286 		break;
6287 	case 'c':
6288 	case 'p': {
6289 		struct got_object_id *id = NULL;
6290 
6291 		view->count = 0;
6292 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6293 		    s->first_displayed_line, s->selected_line);
6294 		if (id == NULL)
6295 			break;
6296 		if (ch == 'p') {
6297 			struct got_commit_object *commit, *pcommit;
6298 			struct got_object_qid *pid;
6299 			struct got_object_id *blob_id = NULL;
6300 			int obj_type;
6301 			err = got_object_open_as_commit(&commit,
6302 			    s->repo, id);
6303 			if (err)
6304 				break;
6305 			pid = STAILQ_FIRST(
6306 			    got_object_commit_get_parent_ids(commit));
6307 			if (pid == NULL) {
6308 				got_object_commit_close(commit);
6309 				break;
6310 			}
6311 			/* Check if path history ends here. */
6312 			err = got_object_open_as_commit(&pcommit,
6313 			    s->repo, &pid->id);
6314 			if (err)
6315 				break;
6316 			err = got_object_id_by_path(&blob_id, s->repo,
6317 			    pcommit, s->path);
6318 			got_object_commit_close(pcommit);
6319 			if (err) {
6320 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6321 					err = NULL;
6322 				got_object_commit_close(commit);
6323 				break;
6324 			}
6325 			err = got_object_get_type(&obj_type, s->repo,
6326 			    blob_id);
6327 			free(blob_id);
6328 			/* Can't blame non-blob type objects. */
6329 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6330 				got_object_commit_close(commit);
6331 				break;
6332 			}
6333 			err = got_object_qid_alloc(&s->blamed_commit,
6334 			    &pid->id);
6335 			got_object_commit_close(commit);
6336 		} else {
6337 			if (got_object_id_cmp(id,
6338 			    &s->blamed_commit->id) == 0)
6339 				break;
6340 			err = got_object_qid_alloc(&s->blamed_commit,
6341 			    id);
6342 		}
6343 		if (err)
6344 			break;
6345 		s->done = 1;
6346 		thread_err = stop_blame(&s->blame);
6347 		s->done = 0;
6348 		if (thread_err)
6349 			break;
6350 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6351 		    s->blamed_commit, entry);
6352 		err = run_blame(view);
6353 		if (err)
6354 			break;
6355 		break;
6356 	}
6357 	case 'C': {
6358 		struct got_object_qid *first;
6359 
6360 		view->count = 0;
6361 		first = STAILQ_FIRST(&s->blamed_commits);
6362 		if (!got_object_id_cmp(&first->id, s->commit_id))
6363 			break;
6364 		s->done = 1;
6365 		thread_err = stop_blame(&s->blame);
6366 		s->done = 0;
6367 		if (thread_err)
6368 			break;
6369 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6370 		got_object_qid_free(s->blamed_commit);
6371 		s->blamed_commit =
6372 		    STAILQ_FIRST(&s->blamed_commits);
6373 		err = run_blame(view);
6374 		if (err)
6375 			break;
6376 		break;
6377 	}
6378 	case 'L':
6379 		view->count = 0;
6380 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6381 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6382 		if (s->id_to_log)
6383 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6384 		break;
6385 	case KEY_ENTER:
6386 	case '\r': {
6387 		struct got_object_id *id = NULL;
6388 		struct got_object_qid *pid;
6389 		struct got_commit_object *commit = NULL;
6390 
6391 		view->count = 0;
6392 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6393 		    s->first_displayed_line, s->selected_line);
6394 		if (id == NULL)
6395 			break;
6396 		err = got_object_open_as_commit(&commit, s->repo, id);
6397 		if (err)
6398 			break;
6399 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6400 		if (*new_view) {
6401 			/* traversed from diff view, release diff resources  */
6402 			err = close_diff_view(*new_view);
6403 			if (err)
6404 				break;
6405 			diff_view = *new_view;
6406 		} else {
6407 			if (view_is_parent_view(view))
6408 				view_get_split(view, &begin_y, &begin_x);
6409 
6410 			diff_view = view_open(0, 0, begin_y, begin_x,
6411 			    TOG_VIEW_DIFF);
6412 			if (diff_view == NULL) {
6413 				got_object_commit_close(commit);
6414 				err = got_error_from_errno("view_open");
6415 				break;
6416 			}
6417 		}
6418 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6419 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6420 		got_object_commit_close(commit);
6421 		if (err) {
6422 			view_close(diff_view);
6423 			break;
6424 		}
6425 		s->last_diffed_line = s->first_displayed_line - 1 +
6426 		    s->selected_line;
6427 		if (*new_view)
6428 			break;	/* still open from active diff view */
6429 		if (view_is_parent_view(view) &&
6430 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6431 			err = view_init_hsplit(view, begin_y);
6432 			if (err)
6433 				break;
6434 		}
6435 
6436 		view->focussed = 0;
6437 		diff_view->focussed = 1;
6438 		diff_view->mode = view->mode;
6439 		diff_view->nlines = view->lines - begin_y;
6440 		if (view_is_parent_view(view)) {
6441 			view_transfer_size(diff_view, view);
6442 			err = view_close_child(view);
6443 			if (err)
6444 				break;
6445 			err = view_set_child(view, diff_view);
6446 			if (err)
6447 				break;
6448 			view->focus_child = 1;
6449 		} else
6450 			*new_view = diff_view;
6451 		if (err)
6452 			break;
6453 		break;
6454 	}
6455 	case CTRL('d'):
6456 	case 'd':
6457 		nscroll /= 2;
6458 		/* FALL THROUGH */
6459 	case KEY_NPAGE:
6460 	case CTRL('f'):
6461 	case 'f':
6462 	case ' ':
6463 		if (s->last_displayed_line >= s->blame.nlines &&
6464 		    s->selected_line >= MIN(s->blame.nlines,
6465 		    view->nlines - 2)) {
6466 			view->count = 0;
6467 			break;
6468 		}
6469 		if (s->last_displayed_line >= s->blame.nlines &&
6470 		    s->selected_line < view->nlines - 2) {
6471 			s->selected_line +=
6472 			    MIN(nscroll, s->last_displayed_line -
6473 			    s->first_displayed_line - s->selected_line + 1);
6474 		}
6475 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6476 			s->first_displayed_line += nscroll;
6477 		else
6478 			s->first_displayed_line =
6479 			    s->blame.nlines - (view->nlines - 3);
6480 		break;
6481 	case KEY_RESIZE:
6482 		if (s->selected_line > view->nlines - 2) {
6483 			s->selected_line = MIN(s->blame.nlines,
6484 			    view->nlines - 2);
6485 		}
6486 		break;
6487 	default:
6488 		view->count = 0;
6489 		break;
6490 	}
6491 	return thread_err ? thread_err : err;
6492 }
6493 
6494 static const struct got_error *
6495 reset_blame_view(struct tog_view *view)
6496 {
6497 	const struct got_error *err;
6498 	struct tog_blame_view_state *s = &view->state.blame;
6499 
6500 	view->count = 0;
6501 	s->done = 1;
6502 	err = stop_blame(&s->blame);
6503 	s->done = 0;
6504 	if (err)
6505 		return err;
6506 	return run_blame(view);
6507 }
6508 
6509 static const struct got_error *
6510 cmd_blame(int argc, char *argv[])
6511 {
6512 	const struct got_error *error;
6513 	struct got_repository *repo = NULL;
6514 	struct got_worktree *worktree = NULL;
6515 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6516 	char *link_target = NULL;
6517 	struct got_object_id *commit_id = NULL;
6518 	struct got_commit_object *commit = NULL;
6519 	char *commit_id_str = NULL;
6520 	int ch;
6521 	struct tog_view *view;
6522 	int *pack_fds = NULL;
6523 
6524 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6525 		switch (ch) {
6526 		case 'c':
6527 			commit_id_str = optarg;
6528 			break;
6529 		case 'r':
6530 			repo_path = realpath(optarg, NULL);
6531 			if (repo_path == NULL)
6532 				return got_error_from_errno2("realpath",
6533 				    optarg);
6534 			break;
6535 		default:
6536 			usage_blame();
6537 			/* NOTREACHED */
6538 		}
6539 	}
6540 
6541 	argc -= optind;
6542 	argv += optind;
6543 
6544 	if (argc != 1)
6545 		usage_blame();
6546 
6547 	error = got_repo_pack_fds_open(&pack_fds);
6548 	if (error != NULL)
6549 		goto done;
6550 
6551 	if (repo_path == NULL) {
6552 		cwd = getcwd(NULL, 0);
6553 		if (cwd == NULL)
6554 			return got_error_from_errno("getcwd");
6555 		error = got_worktree_open(&worktree, cwd);
6556 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6557 			goto done;
6558 		if (worktree)
6559 			repo_path =
6560 			    strdup(got_worktree_get_repo_path(worktree));
6561 		else
6562 			repo_path = strdup(cwd);
6563 		if (repo_path == NULL) {
6564 			error = got_error_from_errno("strdup");
6565 			goto done;
6566 		}
6567 	}
6568 
6569 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6570 	if (error != NULL)
6571 		goto done;
6572 
6573 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6574 	    worktree);
6575 	if (error)
6576 		goto done;
6577 
6578 	init_curses();
6579 
6580 	error = apply_unveil(got_repo_get_path(repo), NULL);
6581 	if (error)
6582 		goto done;
6583 
6584 	error = tog_load_refs(repo, 0);
6585 	if (error)
6586 		goto done;
6587 
6588 	if (commit_id_str == NULL) {
6589 		struct got_reference *head_ref;
6590 		error = got_ref_open(&head_ref, repo, worktree ?
6591 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6592 		if (error != NULL)
6593 			goto done;
6594 		error = got_ref_resolve(&commit_id, repo, head_ref);
6595 		got_ref_close(head_ref);
6596 	} else {
6597 		error = got_repo_match_object_id(&commit_id, NULL,
6598 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6599 	}
6600 	if (error != NULL)
6601 		goto done;
6602 
6603 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6604 	if (view == NULL) {
6605 		error = got_error_from_errno("view_open");
6606 		goto done;
6607 	}
6608 
6609 	error = got_object_open_as_commit(&commit, repo, commit_id);
6610 	if (error)
6611 		goto done;
6612 
6613 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6614 	    commit, repo);
6615 	if (error)
6616 		goto done;
6617 
6618 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6619 	    commit_id, repo);
6620 	if (error)
6621 		goto done;
6622 	if (worktree) {
6623 		/* Release work tree lock. */
6624 		got_worktree_close(worktree);
6625 		worktree = NULL;
6626 	}
6627 	error = view_loop(view);
6628 done:
6629 	free(repo_path);
6630 	free(in_repo_path);
6631 	free(link_target);
6632 	free(cwd);
6633 	free(commit_id);
6634 	if (commit)
6635 		got_object_commit_close(commit);
6636 	if (worktree)
6637 		got_worktree_close(worktree);
6638 	if (repo) {
6639 		const struct got_error *close_err = got_repo_close(repo);
6640 		if (error == NULL)
6641 			error = close_err;
6642 	}
6643 	if (pack_fds) {
6644 		const struct got_error *pack_err =
6645 		    got_repo_pack_fds_close(pack_fds);
6646 		if (error == NULL)
6647 			error = pack_err;
6648 	}
6649 	tog_free_refs();
6650 	return error;
6651 }
6652 
6653 static const struct got_error *
6654 draw_tree_entries(struct tog_view *view, const char *parent_path)
6655 {
6656 	struct tog_tree_view_state *s = &view->state.tree;
6657 	const struct got_error *err = NULL;
6658 	struct got_tree_entry *te;
6659 	wchar_t *wline;
6660 	char *index = NULL;
6661 	struct tog_color *tc;
6662 	int width, n, nentries, i = 1;
6663 	int limit = view->nlines;
6664 
6665 	s->ndisplayed = 0;
6666 	if (view_is_hsplit_top(view))
6667 		--limit;  /* border */
6668 
6669 	werase(view->window);
6670 
6671 	if (limit == 0)
6672 		return NULL;
6673 
6674 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6675 	    0, 0);
6676 	if (err)
6677 		return err;
6678 	if (view_needs_focus_indication(view))
6679 		wstandout(view->window);
6680 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6681 	if (tc)
6682 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6683 	waddwstr(view->window, wline);
6684 	free(wline);
6685 	wline = NULL;
6686 	while (width++ < view->ncols)
6687 		waddch(view->window, ' ');
6688 	if (tc)
6689 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6690 	if (view_needs_focus_indication(view))
6691 		wstandend(view->window);
6692 	if (--limit <= 0)
6693 		return NULL;
6694 
6695 	i += s->selected;
6696 	if (s->first_displayed_entry) {
6697 		i += got_tree_entry_get_index(s->first_displayed_entry);
6698 		if (s->tree != s->root)
6699 			++i;  /* account for ".." entry */
6700 	}
6701 	nentries = got_object_tree_get_nentries(s->tree);
6702 	if (asprintf(&index, "[%d/%d] %s",
6703 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6704 		return got_error_from_errno("asprintf");
6705 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6706 	free(index);
6707 	if (err)
6708 		return err;
6709 	waddwstr(view->window, wline);
6710 	free(wline);
6711 	wline = NULL;
6712 	if (width < view->ncols - 1)
6713 		waddch(view->window, '\n');
6714 	if (--limit <= 0)
6715 		return NULL;
6716 	waddch(view->window, '\n');
6717 	if (--limit <= 0)
6718 		return NULL;
6719 
6720 	if (s->first_displayed_entry == NULL) {
6721 		te = got_object_tree_get_first_entry(s->tree);
6722 		if (s->selected == 0) {
6723 			if (view->focussed)
6724 				wstandout(view->window);
6725 			s->selected_entry = NULL;
6726 		}
6727 		waddstr(view->window, "  ..\n");	/* parent directory */
6728 		if (s->selected == 0 && view->focussed)
6729 			wstandend(view->window);
6730 		s->ndisplayed++;
6731 		if (--limit <= 0)
6732 			return NULL;
6733 		n = 1;
6734 	} else {
6735 		n = 0;
6736 		te = s->first_displayed_entry;
6737 	}
6738 
6739 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6740 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6741 		const char *modestr = "";
6742 		mode_t mode;
6743 
6744 		te = got_object_tree_get_entry(s->tree, i);
6745 		mode = got_tree_entry_get_mode(te);
6746 
6747 		if (s->show_ids) {
6748 			err = got_object_id_str(&id_str,
6749 			    got_tree_entry_get_id(te));
6750 			if (err)
6751 				return got_error_from_errno(
6752 				    "got_object_id_str");
6753 		}
6754 		if (got_object_tree_entry_is_submodule(te))
6755 			modestr = "$";
6756 		else if (S_ISLNK(mode)) {
6757 			int i;
6758 
6759 			err = got_tree_entry_get_symlink_target(&link_target,
6760 			    te, s->repo);
6761 			if (err) {
6762 				free(id_str);
6763 				return err;
6764 			}
6765 			for (i = 0; i < strlen(link_target); i++) {
6766 				if (!isprint((unsigned char)link_target[i]))
6767 					link_target[i] = '?';
6768 			}
6769 			modestr = "@";
6770 		}
6771 		else if (S_ISDIR(mode))
6772 			modestr = "/";
6773 		else if (mode & S_IXUSR)
6774 			modestr = "*";
6775 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6776 		    got_tree_entry_get_name(te), modestr,
6777 		    link_target ? " -> ": "",
6778 		    link_target ? link_target : "") == -1) {
6779 			free(id_str);
6780 			free(link_target);
6781 			return got_error_from_errno("asprintf");
6782 		}
6783 		free(id_str);
6784 		free(link_target);
6785 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6786 		    0, 0);
6787 		if (err) {
6788 			free(line);
6789 			break;
6790 		}
6791 		if (n == s->selected) {
6792 			if (view->focussed)
6793 				wstandout(view->window);
6794 			s->selected_entry = te;
6795 		}
6796 		tc = match_color(&s->colors, line);
6797 		if (tc)
6798 			wattr_on(view->window,
6799 			    COLOR_PAIR(tc->colorpair), NULL);
6800 		waddwstr(view->window, wline);
6801 		if (tc)
6802 			wattr_off(view->window,
6803 			    COLOR_PAIR(tc->colorpair), NULL);
6804 		if (width < view->ncols - 1)
6805 			waddch(view->window, '\n');
6806 		if (n == s->selected && view->focussed)
6807 			wstandend(view->window);
6808 		free(line);
6809 		free(wline);
6810 		wline = NULL;
6811 		n++;
6812 		s->ndisplayed++;
6813 		s->last_displayed_entry = te;
6814 		if (--limit <= 0)
6815 			break;
6816 	}
6817 
6818 	return err;
6819 }
6820 
6821 static void
6822 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6823 {
6824 	struct got_tree_entry *te;
6825 	int isroot = s->tree == s->root;
6826 	int i = 0;
6827 
6828 	if (s->first_displayed_entry == NULL)
6829 		return;
6830 
6831 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6832 	while (i++ < maxscroll) {
6833 		if (te == NULL) {
6834 			if (!isroot)
6835 				s->first_displayed_entry = NULL;
6836 			break;
6837 		}
6838 		s->first_displayed_entry = te;
6839 		te = got_tree_entry_get_prev(s->tree, te);
6840 	}
6841 }
6842 
6843 static const struct got_error *
6844 tree_scroll_down(struct tog_view *view, int maxscroll)
6845 {
6846 	struct tog_tree_view_state *s = &view->state.tree;
6847 	struct got_tree_entry *next, *last;
6848 	int n = 0;
6849 
6850 	if (s->first_displayed_entry)
6851 		next = got_tree_entry_get_next(s->tree,
6852 		    s->first_displayed_entry);
6853 	else
6854 		next = got_object_tree_get_first_entry(s->tree);
6855 
6856 	last = s->last_displayed_entry;
6857 	while (next && n++ < maxscroll) {
6858 		if (last) {
6859 			s->last_displayed_entry = last;
6860 			last = got_tree_entry_get_next(s->tree, last);
6861 		}
6862 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6863 			s->first_displayed_entry = next;
6864 			next = got_tree_entry_get_next(s->tree, next);
6865 		}
6866 	}
6867 
6868 	return NULL;
6869 }
6870 
6871 static const struct got_error *
6872 tree_entry_path(char **path, struct tog_parent_trees *parents,
6873     struct got_tree_entry *te)
6874 {
6875 	const struct got_error *err = NULL;
6876 	struct tog_parent_tree *pt;
6877 	size_t len = 2; /* for leading slash and NUL */
6878 
6879 	TAILQ_FOREACH(pt, parents, entry)
6880 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6881 		    + 1 /* slash */;
6882 	if (te)
6883 		len += strlen(got_tree_entry_get_name(te));
6884 
6885 	*path = calloc(1, len);
6886 	if (path == NULL)
6887 		return got_error_from_errno("calloc");
6888 
6889 	(*path)[0] = '/';
6890 	pt = TAILQ_LAST(parents, tog_parent_trees);
6891 	while (pt) {
6892 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6893 		if (strlcat(*path, name, len) >= len) {
6894 			err = got_error(GOT_ERR_NO_SPACE);
6895 			goto done;
6896 		}
6897 		if (strlcat(*path, "/", len) >= len) {
6898 			err = got_error(GOT_ERR_NO_SPACE);
6899 			goto done;
6900 		}
6901 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6902 	}
6903 	if (te) {
6904 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6905 			err = got_error(GOT_ERR_NO_SPACE);
6906 			goto done;
6907 		}
6908 	}
6909 done:
6910 	if (err) {
6911 		free(*path);
6912 		*path = NULL;
6913 	}
6914 	return err;
6915 }
6916 
6917 static const struct got_error *
6918 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6919     struct got_tree_entry *te, struct tog_parent_trees *parents,
6920     struct got_object_id *commit_id, struct got_repository *repo)
6921 {
6922 	const struct got_error *err = NULL;
6923 	char *path;
6924 	struct tog_view *blame_view;
6925 
6926 	*new_view = NULL;
6927 
6928 	err = tree_entry_path(&path, parents, te);
6929 	if (err)
6930 		return err;
6931 
6932 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6933 	if (blame_view == NULL) {
6934 		err = got_error_from_errno("view_open");
6935 		goto done;
6936 	}
6937 
6938 	err = open_blame_view(blame_view, path, commit_id, repo);
6939 	if (err) {
6940 		if (err->code == GOT_ERR_CANCELLED)
6941 			err = NULL;
6942 		view_close(blame_view);
6943 	} else
6944 		*new_view = blame_view;
6945 done:
6946 	free(path);
6947 	return err;
6948 }
6949 
6950 static const struct got_error *
6951 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6952     struct tog_tree_view_state *s)
6953 {
6954 	struct tog_view *log_view;
6955 	const struct got_error *err = NULL;
6956 	char *path;
6957 
6958 	*new_view = NULL;
6959 
6960 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6961 	if (log_view == NULL)
6962 		return got_error_from_errno("view_open");
6963 
6964 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6965 	if (err)
6966 		return err;
6967 
6968 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6969 	    path, 0);
6970 	if (err)
6971 		view_close(log_view);
6972 	else
6973 		*new_view = log_view;
6974 	free(path);
6975 	return err;
6976 }
6977 
6978 static const struct got_error *
6979 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6980     const char *head_ref_name, struct got_repository *repo)
6981 {
6982 	const struct got_error *err = NULL;
6983 	char *commit_id_str = NULL;
6984 	struct tog_tree_view_state *s = &view->state.tree;
6985 	struct got_commit_object *commit = NULL;
6986 
6987 	TAILQ_INIT(&s->parents);
6988 	STAILQ_INIT(&s->colors);
6989 
6990 	s->commit_id = got_object_id_dup(commit_id);
6991 	if (s->commit_id == NULL)
6992 		return got_error_from_errno("got_object_id_dup");
6993 
6994 	err = got_object_open_as_commit(&commit, repo, commit_id);
6995 	if (err)
6996 		goto done;
6997 
6998 	/*
6999 	 * The root is opened here and will be closed when the view is closed.
7000 	 * Any visited subtrees and their path-wise parents are opened and
7001 	 * closed on demand.
7002 	 */
7003 	err = got_object_open_as_tree(&s->root, repo,
7004 	    got_object_commit_get_tree_id(commit));
7005 	if (err)
7006 		goto done;
7007 	s->tree = s->root;
7008 
7009 	err = got_object_id_str(&commit_id_str, commit_id);
7010 	if (err != NULL)
7011 		goto done;
7012 
7013 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7014 		err = got_error_from_errno("asprintf");
7015 		goto done;
7016 	}
7017 
7018 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7019 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7020 	if (head_ref_name) {
7021 		s->head_ref_name = strdup(head_ref_name);
7022 		if (s->head_ref_name == NULL) {
7023 			err = got_error_from_errno("strdup");
7024 			goto done;
7025 		}
7026 	}
7027 	s->repo = repo;
7028 
7029 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7030 		err = add_color(&s->colors, "\\$$",
7031 		    TOG_COLOR_TREE_SUBMODULE,
7032 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7033 		if (err)
7034 			goto done;
7035 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7036 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7037 		if (err)
7038 			goto done;
7039 		err = add_color(&s->colors, "/$",
7040 		    TOG_COLOR_TREE_DIRECTORY,
7041 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7042 		if (err)
7043 			goto done;
7044 
7045 		err = add_color(&s->colors, "\\*$",
7046 		    TOG_COLOR_TREE_EXECUTABLE,
7047 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7048 		if (err)
7049 			goto done;
7050 
7051 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7052 		    get_color_value("TOG_COLOR_COMMIT"));
7053 		if (err)
7054 			goto done;
7055 	}
7056 
7057 	view->show = show_tree_view;
7058 	view->input = input_tree_view;
7059 	view->close = close_tree_view;
7060 	view->search_start = search_start_tree_view;
7061 	view->search_next = search_next_tree_view;
7062 done:
7063 	free(commit_id_str);
7064 	if (commit)
7065 		got_object_commit_close(commit);
7066 	if (err)
7067 		close_tree_view(view);
7068 	return err;
7069 }
7070 
7071 static const struct got_error *
7072 close_tree_view(struct tog_view *view)
7073 {
7074 	struct tog_tree_view_state *s = &view->state.tree;
7075 
7076 	free_colors(&s->colors);
7077 	free(s->tree_label);
7078 	s->tree_label = NULL;
7079 	free(s->commit_id);
7080 	s->commit_id = NULL;
7081 	free(s->head_ref_name);
7082 	s->head_ref_name = NULL;
7083 	while (!TAILQ_EMPTY(&s->parents)) {
7084 		struct tog_parent_tree *parent;
7085 		parent = TAILQ_FIRST(&s->parents);
7086 		TAILQ_REMOVE(&s->parents, parent, entry);
7087 		if (parent->tree != s->root)
7088 			got_object_tree_close(parent->tree);
7089 		free(parent);
7090 
7091 	}
7092 	if (s->tree != NULL && s->tree != s->root)
7093 		got_object_tree_close(s->tree);
7094 	if (s->root)
7095 		got_object_tree_close(s->root);
7096 	return NULL;
7097 }
7098 
7099 static const struct got_error *
7100 search_start_tree_view(struct tog_view *view)
7101 {
7102 	struct tog_tree_view_state *s = &view->state.tree;
7103 
7104 	s->matched_entry = NULL;
7105 	return NULL;
7106 }
7107 
7108 static int
7109 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7110 {
7111 	regmatch_t regmatch;
7112 
7113 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7114 	    0) == 0;
7115 }
7116 
7117 static const struct got_error *
7118 search_next_tree_view(struct tog_view *view)
7119 {
7120 	struct tog_tree_view_state *s = &view->state.tree;
7121 	struct got_tree_entry *te = NULL;
7122 
7123 	if (!view->searching) {
7124 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7125 		return NULL;
7126 	}
7127 
7128 	if (s->matched_entry) {
7129 		if (view->searching == TOG_SEARCH_FORWARD) {
7130 			if (s->selected_entry)
7131 				te = got_tree_entry_get_next(s->tree,
7132 				    s->selected_entry);
7133 			else
7134 				te = got_object_tree_get_first_entry(s->tree);
7135 		} else {
7136 			if (s->selected_entry == NULL)
7137 				te = got_object_tree_get_last_entry(s->tree);
7138 			else
7139 				te = got_tree_entry_get_prev(s->tree,
7140 				    s->selected_entry);
7141 		}
7142 	} else {
7143 		if (s->selected_entry)
7144 			te = s->selected_entry;
7145 		else if (view->searching == TOG_SEARCH_FORWARD)
7146 			te = got_object_tree_get_first_entry(s->tree);
7147 		else
7148 			te = got_object_tree_get_last_entry(s->tree);
7149 	}
7150 
7151 	while (1) {
7152 		if (te == NULL) {
7153 			if (s->matched_entry == NULL) {
7154 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7155 				return NULL;
7156 			}
7157 			if (view->searching == TOG_SEARCH_FORWARD)
7158 				te = got_object_tree_get_first_entry(s->tree);
7159 			else
7160 				te = got_object_tree_get_last_entry(s->tree);
7161 		}
7162 
7163 		if (match_tree_entry(te, &view->regex)) {
7164 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7165 			s->matched_entry = te;
7166 			break;
7167 		}
7168 
7169 		if (view->searching == TOG_SEARCH_FORWARD)
7170 			te = got_tree_entry_get_next(s->tree, te);
7171 		else
7172 			te = got_tree_entry_get_prev(s->tree, te);
7173 	}
7174 
7175 	if (s->matched_entry) {
7176 		s->first_displayed_entry = s->matched_entry;
7177 		s->selected = 0;
7178 	}
7179 
7180 	return NULL;
7181 }
7182 
7183 static const struct got_error *
7184 show_tree_view(struct tog_view *view)
7185 {
7186 	const struct got_error *err = NULL;
7187 	struct tog_tree_view_state *s = &view->state.tree;
7188 	char *parent_path;
7189 
7190 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7191 	if (err)
7192 		return err;
7193 
7194 	err = draw_tree_entries(view, parent_path);
7195 	free(parent_path);
7196 
7197 	view_border(view);
7198 	return err;
7199 }
7200 
7201 static const struct got_error *
7202 tree_goto_line(struct tog_view *view, int nlines)
7203 {
7204 	const struct got_error		 *err = NULL;
7205 	struct tog_tree_view_state	 *s = &view->state.tree;
7206 	struct got_tree_entry		**fte, **lte, **ste;
7207 	int				  g, last, first = 1, i = 1;
7208 	int				  root = s->tree == s->root;
7209 	int				  off = root ? 1 : 2;
7210 
7211 	g = view->gline;
7212 	view->gline = 0;
7213 
7214 	if (g == 0)
7215 		g = 1;
7216 	else if (g > got_object_tree_get_nentries(s->tree))
7217 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7218 
7219 	fte = &s->first_displayed_entry;
7220 	lte = &s->last_displayed_entry;
7221 	ste = &s->selected_entry;
7222 
7223 	if (*fte != NULL) {
7224 		first = got_tree_entry_get_index(*fte);
7225 		first += off;  /* account for ".." */
7226 	}
7227 	last = got_tree_entry_get_index(*lte);
7228 	last += off;
7229 
7230 	if (g >= first && g <= last && g - first < nlines) {
7231 		s->selected = g - first;
7232 		return NULL;	/* gline is on the current page */
7233 	}
7234 
7235 	if (*ste != NULL) {
7236 		i = got_tree_entry_get_index(*ste);
7237 		i += off;
7238 	}
7239 
7240 	if (i < g) {
7241 		err = tree_scroll_down(view, g - i);
7242 		if (err)
7243 			return err;
7244 		if (got_tree_entry_get_index(*lte) >=
7245 		    got_object_tree_get_nentries(s->tree) - 1 &&
7246 		    first + s->selected < g &&
7247 		    s->selected < s->ndisplayed - 1) {
7248 			first = got_tree_entry_get_index(*fte);
7249 			first += off;
7250 			s->selected = g - first;
7251 		}
7252 	} else if (i > g)
7253 		tree_scroll_up(s, i - g);
7254 
7255 	if (g < nlines &&
7256 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7257 		s->selected = g - 1;
7258 
7259 	return NULL;
7260 }
7261 
7262 static const struct got_error *
7263 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7264 {
7265 	const struct got_error *err = NULL;
7266 	struct tog_tree_view_state *s = &view->state.tree;
7267 	struct got_tree_entry *te;
7268 	int n, nscroll = view->nlines - 3;
7269 
7270 	if (view->gline)
7271 		return tree_goto_line(view, nscroll);
7272 
7273 	switch (ch) {
7274 	case 'i':
7275 		s->show_ids = !s->show_ids;
7276 		view->count = 0;
7277 		break;
7278 	case 'L':
7279 		view->count = 0;
7280 		if (!s->selected_entry)
7281 			break;
7282 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7283 		break;
7284 	case 'R':
7285 		view->count = 0;
7286 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7287 		break;
7288 	case 'g':
7289 	case KEY_HOME:
7290 		s->selected = 0;
7291 		view->count = 0;
7292 		if (s->tree == s->root)
7293 			s->first_displayed_entry =
7294 			    got_object_tree_get_first_entry(s->tree);
7295 		else
7296 			s->first_displayed_entry = NULL;
7297 		break;
7298 	case 'G':
7299 	case KEY_END: {
7300 		int eos = view->nlines - 3;
7301 
7302 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7303 			--eos;  /* border */
7304 		s->selected = 0;
7305 		view->count = 0;
7306 		te = got_object_tree_get_last_entry(s->tree);
7307 		for (n = 0; n < eos; n++) {
7308 			if (te == NULL) {
7309 				if (s->tree != s->root) {
7310 					s->first_displayed_entry = NULL;
7311 					n++;
7312 				}
7313 				break;
7314 			}
7315 			s->first_displayed_entry = te;
7316 			te = got_tree_entry_get_prev(s->tree, te);
7317 		}
7318 		if (n > 0)
7319 			s->selected = n - 1;
7320 		break;
7321 	}
7322 	case 'k':
7323 	case KEY_UP:
7324 	case CTRL('p'):
7325 		if (s->selected > 0) {
7326 			s->selected--;
7327 			break;
7328 		}
7329 		tree_scroll_up(s, 1);
7330 		if (s->selected_entry == NULL ||
7331 		    (s->tree == s->root && s->selected_entry ==
7332 		     got_object_tree_get_first_entry(s->tree)))
7333 			view->count = 0;
7334 		break;
7335 	case CTRL('u'):
7336 	case 'u':
7337 		nscroll /= 2;
7338 		/* FALL THROUGH */
7339 	case KEY_PPAGE:
7340 	case CTRL('b'):
7341 	case 'b':
7342 		if (s->tree == s->root) {
7343 			if (got_object_tree_get_first_entry(s->tree) ==
7344 			    s->first_displayed_entry)
7345 				s->selected -= MIN(s->selected, nscroll);
7346 		} else {
7347 			if (s->first_displayed_entry == NULL)
7348 				s->selected -= MIN(s->selected, nscroll);
7349 		}
7350 		tree_scroll_up(s, MAX(0, nscroll));
7351 		if (s->selected_entry == NULL ||
7352 		    (s->tree == s->root && s->selected_entry ==
7353 		     got_object_tree_get_first_entry(s->tree)))
7354 			view->count = 0;
7355 		break;
7356 	case 'j':
7357 	case KEY_DOWN:
7358 	case CTRL('n'):
7359 		if (s->selected < s->ndisplayed - 1) {
7360 			s->selected++;
7361 			break;
7362 		}
7363 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7364 		    == NULL) {
7365 			/* can't scroll any further */
7366 			view->count = 0;
7367 			break;
7368 		}
7369 		tree_scroll_down(view, 1);
7370 		break;
7371 	case CTRL('d'):
7372 	case 'd':
7373 		nscroll /= 2;
7374 		/* FALL THROUGH */
7375 	case KEY_NPAGE:
7376 	case CTRL('f'):
7377 	case 'f':
7378 	case ' ':
7379 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7380 		    == NULL) {
7381 			/* can't scroll any further; move cursor down */
7382 			if (s->selected < s->ndisplayed - 1)
7383 				s->selected += MIN(nscroll,
7384 				    s->ndisplayed - s->selected - 1);
7385 			else
7386 				view->count = 0;
7387 			break;
7388 		}
7389 		tree_scroll_down(view, nscroll);
7390 		break;
7391 	case KEY_ENTER:
7392 	case '\r':
7393 	case KEY_BACKSPACE:
7394 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7395 			struct tog_parent_tree *parent;
7396 			/* user selected '..' */
7397 			if (s->tree == s->root) {
7398 				view->count = 0;
7399 				break;
7400 			}
7401 			parent = TAILQ_FIRST(&s->parents);
7402 			TAILQ_REMOVE(&s->parents, parent,
7403 			    entry);
7404 			got_object_tree_close(s->tree);
7405 			s->tree = parent->tree;
7406 			s->first_displayed_entry =
7407 			    parent->first_displayed_entry;
7408 			s->selected_entry =
7409 			    parent->selected_entry;
7410 			s->selected = parent->selected;
7411 			if (s->selected > view->nlines - 3) {
7412 				err = offset_selection_down(view);
7413 				if (err)
7414 					break;
7415 			}
7416 			free(parent);
7417 		} else if (S_ISDIR(got_tree_entry_get_mode(
7418 		    s->selected_entry))) {
7419 			struct got_tree_object *subtree;
7420 			view->count = 0;
7421 			err = got_object_open_as_tree(&subtree, s->repo,
7422 			    got_tree_entry_get_id(s->selected_entry));
7423 			if (err)
7424 				break;
7425 			err = tree_view_visit_subtree(s, subtree);
7426 			if (err) {
7427 				got_object_tree_close(subtree);
7428 				break;
7429 			}
7430 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7431 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7432 		break;
7433 	case KEY_RESIZE:
7434 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7435 			s->selected = view->nlines - 4;
7436 		view->count = 0;
7437 		break;
7438 	default:
7439 		view->count = 0;
7440 		break;
7441 	}
7442 
7443 	return err;
7444 }
7445 
7446 __dead static void
7447 usage_tree(void)
7448 {
7449 	endwin();
7450 	fprintf(stderr,
7451 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7452 	    getprogname());
7453 	exit(1);
7454 }
7455 
7456 static const struct got_error *
7457 cmd_tree(int argc, char *argv[])
7458 {
7459 	const struct got_error *error;
7460 	struct got_repository *repo = NULL;
7461 	struct got_worktree *worktree = NULL;
7462 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7463 	struct got_object_id *commit_id = NULL;
7464 	struct got_commit_object *commit = NULL;
7465 	const char *commit_id_arg = NULL;
7466 	char *label = NULL;
7467 	struct got_reference *ref = NULL;
7468 	const char *head_ref_name = NULL;
7469 	int ch;
7470 	struct tog_view *view;
7471 	int *pack_fds = NULL;
7472 
7473 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7474 		switch (ch) {
7475 		case 'c':
7476 			commit_id_arg = optarg;
7477 			break;
7478 		case 'r':
7479 			repo_path = realpath(optarg, NULL);
7480 			if (repo_path == NULL)
7481 				return got_error_from_errno2("realpath",
7482 				    optarg);
7483 			break;
7484 		default:
7485 			usage_tree();
7486 			/* NOTREACHED */
7487 		}
7488 	}
7489 
7490 	argc -= optind;
7491 	argv += optind;
7492 
7493 	if (argc > 1)
7494 		usage_tree();
7495 
7496 	error = got_repo_pack_fds_open(&pack_fds);
7497 	if (error != NULL)
7498 		goto done;
7499 
7500 	if (repo_path == NULL) {
7501 		cwd = getcwd(NULL, 0);
7502 		if (cwd == NULL)
7503 			return got_error_from_errno("getcwd");
7504 		error = got_worktree_open(&worktree, cwd);
7505 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7506 			goto done;
7507 		if (worktree)
7508 			repo_path =
7509 			    strdup(got_worktree_get_repo_path(worktree));
7510 		else
7511 			repo_path = strdup(cwd);
7512 		if (repo_path == NULL) {
7513 			error = got_error_from_errno("strdup");
7514 			goto done;
7515 		}
7516 	}
7517 
7518 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7519 	if (error != NULL)
7520 		goto done;
7521 
7522 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7523 	    repo, worktree);
7524 	if (error)
7525 		goto done;
7526 
7527 	init_curses();
7528 
7529 	error = apply_unveil(got_repo_get_path(repo), NULL);
7530 	if (error)
7531 		goto done;
7532 
7533 	error = tog_load_refs(repo, 0);
7534 	if (error)
7535 		goto done;
7536 
7537 	if (commit_id_arg == NULL) {
7538 		error = got_repo_match_object_id(&commit_id, &label,
7539 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7540 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7541 		if (error)
7542 			goto done;
7543 		head_ref_name = label;
7544 	} else {
7545 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7546 		if (error == NULL)
7547 			head_ref_name = got_ref_get_name(ref);
7548 		else if (error->code != GOT_ERR_NOT_REF)
7549 			goto done;
7550 		error = got_repo_match_object_id(&commit_id, NULL,
7551 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7552 		if (error)
7553 			goto done;
7554 	}
7555 
7556 	error = got_object_open_as_commit(&commit, repo, commit_id);
7557 	if (error)
7558 		goto done;
7559 
7560 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7561 	if (view == NULL) {
7562 		error = got_error_from_errno("view_open");
7563 		goto done;
7564 	}
7565 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7566 	if (error)
7567 		goto done;
7568 	if (!got_path_is_root_dir(in_repo_path)) {
7569 		error = tree_view_walk_path(&view->state.tree, commit,
7570 		    in_repo_path);
7571 		if (error)
7572 			goto done;
7573 	}
7574 
7575 	if (worktree) {
7576 		/* Release work tree lock. */
7577 		got_worktree_close(worktree);
7578 		worktree = NULL;
7579 	}
7580 	error = view_loop(view);
7581 done:
7582 	free(repo_path);
7583 	free(cwd);
7584 	free(commit_id);
7585 	free(label);
7586 	if (ref)
7587 		got_ref_close(ref);
7588 	if (repo) {
7589 		const struct got_error *close_err = got_repo_close(repo);
7590 		if (error == NULL)
7591 			error = close_err;
7592 	}
7593 	if (pack_fds) {
7594 		const struct got_error *pack_err =
7595 		    got_repo_pack_fds_close(pack_fds);
7596 		if (error == NULL)
7597 			error = pack_err;
7598 	}
7599 	tog_free_refs();
7600 	return error;
7601 }
7602 
7603 static const struct got_error *
7604 ref_view_load_refs(struct tog_ref_view_state *s)
7605 {
7606 	struct got_reflist_entry *sre;
7607 	struct tog_reflist_entry *re;
7608 
7609 	s->nrefs = 0;
7610 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7611 		if (strncmp(got_ref_get_name(sre->ref),
7612 		    "refs/got/", 9) == 0 &&
7613 		    strncmp(got_ref_get_name(sre->ref),
7614 		    "refs/got/backup/", 16) != 0)
7615 			continue;
7616 
7617 		re = malloc(sizeof(*re));
7618 		if (re == NULL)
7619 			return got_error_from_errno("malloc");
7620 
7621 		re->ref = got_ref_dup(sre->ref);
7622 		if (re->ref == NULL)
7623 			return got_error_from_errno("got_ref_dup");
7624 		re->idx = s->nrefs++;
7625 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7626 	}
7627 
7628 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7629 	return NULL;
7630 }
7631 
7632 static void
7633 ref_view_free_refs(struct tog_ref_view_state *s)
7634 {
7635 	struct tog_reflist_entry *re;
7636 
7637 	while (!TAILQ_EMPTY(&s->refs)) {
7638 		re = TAILQ_FIRST(&s->refs);
7639 		TAILQ_REMOVE(&s->refs, re, entry);
7640 		got_ref_close(re->ref);
7641 		free(re);
7642 	}
7643 }
7644 
7645 static const struct got_error *
7646 open_ref_view(struct tog_view *view, struct got_repository *repo)
7647 {
7648 	const struct got_error *err = NULL;
7649 	struct tog_ref_view_state *s = &view->state.ref;
7650 
7651 	s->selected_entry = 0;
7652 	s->repo = repo;
7653 
7654 	TAILQ_INIT(&s->refs);
7655 	STAILQ_INIT(&s->colors);
7656 
7657 	err = ref_view_load_refs(s);
7658 	if (err)
7659 		return err;
7660 
7661 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7662 		err = add_color(&s->colors, "^refs/heads/",
7663 		    TOG_COLOR_REFS_HEADS,
7664 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7665 		if (err)
7666 			goto done;
7667 
7668 		err = add_color(&s->colors, "^refs/tags/",
7669 		    TOG_COLOR_REFS_TAGS,
7670 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7671 		if (err)
7672 			goto done;
7673 
7674 		err = add_color(&s->colors, "^refs/remotes/",
7675 		    TOG_COLOR_REFS_REMOTES,
7676 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7677 		if (err)
7678 			goto done;
7679 
7680 		err = add_color(&s->colors, "^refs/got/backup/",
7681 		    TOG_COLOR_REFS_BACKUP,
7682 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7683 		if (err)
7684 			goto done;
7685 	}
7686 
7687 	view->show = show_ref_view;
7688 	view->input = input_ref_view;
7689 	view->close = close_ref_view;
7690 	view->search_start = search_start_ref_view;
7691 	view->search_next = search_next_ref_view;
7692 done:
7693 	if (err)
7694 		free_colors(&s->colors);
7695 	return err;
7696 }
7697 
7698 static const struct got_error *
7699 close_ref_view(struct tog_view *view)
7700 {
7701 	struct tog_ref_view_state *s = &view->state.ref;
7702 
7703 	ref_view_free_refs(s);
7704 	free_colors(&s->colors);
7705 
7706 	return NULL;
7707 }
7708 
7709 static const struct got_error *
7710 resolve_reflist_entry(struct got_object_id **commit_id,
7711     struct tog_reflist_entry *re, struct got_repository *repo)
7712 {
7713 	const struct got_error *err = NULL;
7714 	struct got_object_id *obj_id;
7715 	struct got_tag_object *tag = NULL;
7716 	int obj_type;
7717 
7718 	*commit_id = NULL;
7719 
7720 	err = got_ref_resolve(&obj_id, repo, re->ref);
7721 	if (err)
7722 		return err;
7723 
7724 	err = got_object_get_type(&obj_type, repo, obj_id);
7725 	if (err)
7726 		goto done;
7727 
7728 	switch (obj_type) {
7729 	case GOT_OBJ_TYPE_COMMIT:
7730 		*commit_id = obj_id;
7731 		break;
7732 	case GOT_OBJ_TYPE_TAG:
7733 		err = got_object_open_as_tag(&tag, repo, obj_id);
7734 		if (err)
7735 			goto done;
7736 		free(obj_id);
7737 		err = got_object_get_type(&obj_type, repo,
7738 		    got_object_tag_get_object_id(tag));
7739 		if (err)
7740 			goto done;
7741 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7742 			err = got_error(GOT_ERR_OBJ_TYPE);
7743 			goto done;
7744 		}
7745 		*commit_id = got_object_id_dup(
7746 		    got_object_tag_get_object_id(tag));
7747 		if (*commit_id == NULL) {
7748 			err = got_error_from_errno("got_object_id_dup");
7749 			goto done;
7750 		}
7751 		break;
7752 	default:
7753 		err = got_error(GOT_ERR_OBJ_TYPE);
7754 		break;
7755 	}
7756 
7757 done:
7758 	if (tag)
7759 		got_object_tag_close(tag);
7760 	if (err) {
7761 		free(*commit_id);
7762 		*commit_id = NULL;
7763 	}
7764 	return err;
7765 }
7766 
7767 static const struct got_error *
7768 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7769     struct tog_reflist_entry *re, struct got_repository *repo)
7770 {
7771 	struct tog_view *log_view;
7772 	const struct got_error *err = NULL;
7773 	struct got_object_id *commit_id = NULL;
7774 
7775 	*new_view = NULL;
7776 
7777 	err = resolve_reflist_entry(&commit_id, re, repo);
7778 	if (err) {
7779 		if (err->code != GOT_ERR_OBJ_TYPE)
7780 			return err;
7781 		else
7782 			return NULL;
7783 	}
7784 
7785 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7786 	if (log_view == NULL) {
7787 		err = got_error_from_errno("view_open");
7788 		goto done;
7789 	}
7790 
7791 	err = open_log_view(log_view, commit_id, repo,
7792 	    got_ref_get_name(re->ref), "", 0);
7793 done:
7794 	if (err)
7795 		view_close(log_view);
7796 	else
7797 		*new_view = log_view;
7798 	free(commit_id);
7799 	return err;
7800 }
7801 
7802 static void
7803 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7804 {
7805 	struct tog_reflist_entry *re;
7806 	int i = 0;
7807 
7808 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7809 		return;
7810 
7811 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7812 	while (i++ < maxscroll) {
7813 		if (re == NULL)
7814 			break;
7815 		s->first_displayed_entry = re;
7816 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7817 	}
7818 }
7819 
7820 static const struct got_error *
7821 ref_scroll_down(struct tog_view *view, int maxscroll)
7822 {
7823 	struct tog_ref_view_state *s = &view->state.ref;
7824 	struct tog_reflist_entry *next, *last;
7825 	int n = 0;
7826 
7827 	if (s->first_displayed_entry)
7828 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7829 	else
7830 		next = TAILQ_FIRST(&s->refs);
7831 
7832 	last = s->last_displayed_entry;
7833 	while (next && n++ < maxscroll) {
7834 		if (last) {
7835 			s->last_displayed_entry = last;
7836 			last = TAILQ_NEXT(last, entry);
7837 		}
7838 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7839 			s->first_displayed_entry = next;
7840 			next = TAILQ_NEXT(next, entry);
7841 		}
7842 	}
7843 
7844 	return NULL;
7845 }
7846 
7847 static const struct got_error *
7848 search_start_ref_view(struct tog_view *view)
7849 {
7850 	struct tog_ref_view_state *s = &view->state.ref;
7851 
7852 	s->matched_entry = NULL;
7853 	return NULL;
7854 }
7855 
7856 static int
7857 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7858 {
7859 	regmatch_t regmatch;
7860 
7861 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7862 	    0) == 0;
7863 }
7864 
7865 static const struct got_error *
7866 search_next_ref_view(struct tog_view *view)
7867 {
7868 	struct tog_ref_view_state *s = &view->state.ref;
7869 	struct tog_reflist_entry *re = NULL;
7870 
7871 	if (!view->searching) {
7872 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7873 		return NULL;
7874 	}
7875 
7876 	if (s->matched_entry) {
7877 		if (view->searching == TOG_SEARCH_FORWARD) {
7878 			if (s->selected_entry)
7879 				re = TAILQ_NEXT(s->selected_entry, entry);
7880 			else
7881 				re = TAILQ_PREV(s->selected_entry,
7882 				    tog_reflist_head, entry);
7883 		} else {
7884 			if (s->selected_entry == NULL)
7885 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7886 			else
7887 				re = TAILQ_PREV(s->selected_entry,
7888 				    tog_reflist_head, entry);
7889 		}
7890 	} else {
7891 		if (s->selected_entry)
7892 			re = s->selected_entry;
7893 		else if (view->searching == TOG_SEARCH_FORWARD)
7894 			re = TAILQ_FIRST(&s->refs);
7895 		else
7896 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7897 	}
7898 
7899 	while (1) {
7900 		if (re == NULL) {
7901 			if (s->matched_entry == NULL) {
7902 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7903 				return NULL;
7904 			}
7905 			if (view->searching == TOG_SEARCH_FORWARD)
7906 				re = TAILQ_FIRST(&s->refs);
7907 			else
7908 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7909 		}
7910 
7911 		if (match_reflist_entry(re, &view->regex)) {
7912 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7913 			s->matched_entry = re;
7914 			break;
7915 		}
7916 
7917 		if (view->searching == TOG_SEARCH_FORWARD)
7918 			re = TAILQ_NEXT(re, entry);
7919 		else
7920 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7921 	}
7922 
7923 	if (s->matched_entry) {
7924 		s->first_displayed_entry = s->matched_entry;
7925 		s->selected = 0;
7926 	}
7927 
7928 	return NULL;
7929 }
7930 
7931 static const struct got_error *
7932 show_ref_view(struct tog_view *view)
7933 {
7934 	const struct got_error *err = NULL;
7935 	struct tog_ref_view_state *s = &view->state.ref;
7936 	struct tog_reflist_entry *re;
7937 	char *line = NULL;
7938 	wchar_t *wline;
7939 	struct tog_color *tc;
7940 	int width, n;
7941 	int limit = view->nlines;
7942 
7943 	werase(view->window);
7944 
7945 	s->ndisplayed = 0;
7946 	if (view_is_hsplit_top(view))
7947 		--limit;  /* border */
7948 
7949 	if (limit == 0)
7950 		return NULL;
7951 
7952 	re = s->first_displayed_entry;
7953 
7954 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7955 	    s->nrefs) == -1)
7956 		return got_error_from_errno("asprintf");
7957 
7958 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7959 	if (err) {
7960 		free(line);
7961 		return err;
7962 	}
7963 	if (view_needs_focus_indication(view))
7964 		wstandout(view->window);
7965 	waddwstr(view->window, wline);
7966 	while (width++ < view->ncols)
7967 		waddch(view->window, ' ');
7968 	if (view_needs_focus_indication(view))
7969 		wstandend(view->window);
7970 	free(wline);
7971 	wline = NULL;
7972 	free(line);
7973 	line = NULL;
7974 	if (--limit <= 0)
7975 		return NULL;
7976 
7977 	n = 0;
7978 	while (re && limit > 0) {
7979 		char *line = NULL;
7980 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7981 
7982 		if (s->show_date) {
7983 			struct got_commit_object *ci;
7984 			struct got_tag_object *tag;
7985 			struct got_object_id *id;
7986 			struct tm tm;
7987 			time_t t;
7988 
7989 			err = got_ref_resolve(&id, s->repo, re->ref);
7990 			if (err)
7991 				return err;
7992 			err = got_object_open_as_tag(&tag, s->repo, id);
7993 			if (err) {
7994 				if (err->code != GOT_ERR_OBJ_TYPE) {
7995 					free(id);
7996 					return err;
7997 				}
7998 				err = got_object_open_as_commit(&ci, s->repo,
7999 				    id);
8000 				if (err) {
8001 					free(id);
8002 					return err;
8003 				}
8004 				t = got_object_commit_get_committer_time(ci);
8005 				got_object_commit_close(ci);
8006 			} else {
8007 				t = got_object_tag_get_tagger_time(tag);
8008 				got_object_tag_close(tag);
8009 			}
8010 			free(id);
8011 			if (gmtime_r(&t, &tm) == NULL)
8012 				return got_error_from_errno("gmtime_r");
8013 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8014 				return got_error(GOT_ERR_NO_SPACE);
8015 		}
8016 		if (got_ref_is_symbolic(re->ref)) {
8017 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8018 			    ymd : "", got_ref_get_name(re->ref),
8019 			    got_ref_get_symref_target(re->ref)) == -1)
8020 				return got_error_from_errno("asprintf");
8021 		} else if (s->show_ids) {
8022 			struct got_object_id *id;
8023 			char *id_str;
8024 			err = got_ref_resolve(&id, s->repo, re->ref);
8025 			if (err)
8026 				return err;
8027 			err = got_object_id_str(&id_str, id);
8028 			if (err) {
8029 				free(id);
8030 				return err;
8031 			}
8032 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8033 			    got_ref_get_name(re->ref), id_str) == -1) {
8034 				err = got_error_from_errno("asprintf");
8035 				free(id);
8036 				free(id_str);
8037 				return err;
8038 			}
8039 			free(id);
8040 			free(id_str);
8041 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8042 		    got_ref_get_name(re->ref)) == -1)
8043 			return got_error_from_errno("asprintf");
8044 
8045 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8046 		    0, 0);
8047 		if (err) {
8048 			free(line);
8049 			return err;
8050 		}
8051 		if (n == s->selected) {
8052 			if (view->focussed)
8053 				wstandout(view->window);
8054 			s->selected_entry = re;
8055 		}
8056 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8057 		if (tc)
8058 			wattr_on(view->window,
8059 			    COLOR_PAIR(tc->colorpair), NULL);
8060 		waddwstr(view->window, wline);
8061 		if (tc)
8062 			wattr_off(view->window,
8063 			    COLOR_PAIR(tc->colorpair), NULL);
8064 		if (width < view->ncols - 1)
8065 			waddch(view->window, '\n');
8066 		if (n == s->selected && view->focussed)
8067 			wstandend(view->window);
8068 		free(line);
8069 		free(wline);
8070 		wline = NULL;
8071 		n++;
8072 		s->ndisplayed++;
8073 		s->last_displayed_entry = re;
8074 
8075 		limit--;
8076 		re = TAILQ_NEXT(re, entry);
8077 	}
8078 
8079 	view_border(view);
8080 	return err;
8081 }
8082 
8083 static const struct got_error *
8084 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8085     struct tog_reflist_entry *re, struct got_repository *repo)
8086 {
8087 	const struct got_error *err = NULL;
8088 	struct got_object_id *commit_id = NULL;
8089 	struct tog_view *tree_view;
8090 
8091 	*new_view = NULL;
8092 
8093 	err = resolve_reflist_entry(&commit_id, re, repo);
8094 	if (err) {
8095 		if (err->code != GOT_ERR_OBJ_TYPE)
8096 			return err;
8097 		else
8098 			return NULL;
8099 	}
8100 
8101 
8102 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8103 	if (tree_view == NULL) {
8104 		err = got_error_from_errno("view_open");
8105 		goto done;
8106 	}
8107 
8108 	err = open_tree_view(tree_view, commit_id,
8109 	    got_ref_get_name(re->ref), repo);
8110 	if (err)
8111 		goto done;
8112 
8113 	*new_view = tree_view;
8114 done:
8115 	free(commit_id);
8116 	return err;
8117 }
8118 
8119 static const struct got_error *
8120 ref_goto_line(struct tog_view *view, int nlines)
8121 {
8122 	const struct got_error		*err = NULL;
8123 	struct tog_ref_view_state	*s = &view->state.ref;
8124 	int				 g, idx = s->selected_entry->idx;
8125 
8126 	g = view->gline;
8127 	view->gline = 0;
8128 
8129 	if (g == 0)
8130 		g = 1;
8131 	else if (g > s->nrefs)
8132 		g = s->nrefs;
8133 
8134 	if (g >= s->first_displayed_entry->idx + 1 &&
8135 	    g <= s->last_displayed_entry->idx + 1 &&
8136 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8137 		s->selected = g - s->first_displayed_entry->idx - 1;
8138 		return NULL;
8139 	}
8140 
8141 	if (idx + 1 < g) {
8142 		err = ref_scroll_down(view, g - idx - 1);
8143 		if (err)
8144 			return err;
8145 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8146 		    s->first_displayed_entry->idx + s->selected < g &&
8147 		    s->selected < s->ndisplayed - 1)
8148 			s->selected = g - s->first_displayed_entry->idx - 1;
8149 	} else if (idx + 1 > g)
8150 		ref_scroll_up(s, idx - g + 1);
8151 
8152 	if (g < nlines && s->first_displayed_entry->idx == 0)
8153 		s->selected = g - 1;
8154 
8155 	return NULL;
8156 
8157 }
8158 
8159 static const struct got_error *
8160 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8161 {
8162 	const struct got_error *err = NULL;
8163 	struct tog_ref_view_state *s = &view->state.ref;
8164 	struct tog_reflist_entry *re;
8165 	int n, nscroll = view->nlines - 1;
8166 
8167 	if (view->gline)
8168 		return ref_goto_line(view, nscroll);
8169 
8170 	switch (ch) {
8171 	case 'i':
8172 		s->show_ids = !s->show_ids;
8173 		view->count = 0;
8174 		break;
8175 	case 'm':
8176 		s->show_date = !s->show_date;
8177 		view->count = 0;
8178 		break;
8179 	case 'o':
8180 		s->sort_by_date = !s->sort_by_date;
8181 		view->count = 0;
8182 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8183 		    got_ref_cmp_by_commit_timestamp_descending :
8184 		    tog_ref_cmp_by_name, s->repo);
8185 		if (err)
8186 			break;
8187 		got_reflist_object_id_map_free(tog_refs_idmap);
8188 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8189 		    &tog_refs, s->repo);
8190 		if (err)
8191 			break;
8192 		ref_view_free_refs(s);
8193 		err = ref_view_load_refs(s);
8194 		break;
8195 	case KEY_ENTER:
8196 	case '\r':
8197 		view->count = 0;
8198 		if (!s->selected_entry)
8199 			break;
8200 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8201 		break;
8202 	case 'T':
8203 		view->count = 0;
8204 		if (!s->selected_entry)
8205 			break;
8206 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8207 		break;
8208 	case 'g':
8209 	case KEY_HOME:
8210 		s->selected = 0;
8211 		view->count = 0;
8212 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8213 		break;
8214 	case 'G':
8215 	case KEY_END: {
8216 		int eos = view->nlines - 1;
8217 
8218 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8219 			--eos;  /* border */
8220 		s->selected = 0;
8221 		view->count = 0;
8222 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8223 		for (n = 0; n < eos; n++) {
8224 			if (re == NULL)
8225 				break;
8226 			s->first_displayed_entry = re;
8227 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8228 		}
8229 		if (n > 0)
8230 			s->selected = n - 1;
8231 		break;
8232 	}
8233 	case 'k':
8234 	case KEY_UP:
8235 	case CTRL('p'):
8236 		if (s->selected > 0) {
8237 			s->selected--;
8238 			break;
8239 		}
8240 		ref_scroll_up(s, 1);
8241 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8242 			view->count = 0;
8243 		break;
8244 	case CTRL('u'):
8245 	case 'u':
8246 		nscroll /= 2;
8247 		/* FALL THROUGH */
8248 	case KEY_PPAGE:
8249 	case CTRL('b'):
8250 	case 'b':
8251 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8252 			s->selected -= MIN(nscroll, s->selected);
8253 		ref_scroll_up(s, MAX(0, nscroll));
8254 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8255 			view->count = 0;
8256 		break;
8257 	case 'j':
8258 	case KEY_DOWN:
8259 	case CTRL('n'):
8260 		if (s->selected < s->ndisplayed - 1) {
8261 			s->selected++;
8262 			break;
8263 		}
8264 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8265 			/* can't scroll any further */
8266 			view->count = 0;
8267 			break;
8268 		}
8269 		ref_scroll_down(view, 1);
8270 		break;
8271 	case CTRL('d'):
8272 	case 'd':
8273 		nscroll /= 2;
8274 		/* FALL THROUGH */
8275 	case KEY_NPAGE:
8276 	case CTRL('f'):
8277 	case 'f':
8278 	case ' ':
8279 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8280 			/* can't scroll any further; move cursor down */
8281 			if (s->selected < s->ndisplayed - 1)
8282 				s->selected += MIN(nscroll,
8283 				    s->ndisplayed - s->selected - 1);
8284 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8285 				s->selected += s->ndisplayed - s->selected - 1;
8286 			view->count = 0;
8287 			break;
8288 		}
8289 		ref_scroll_down(view, nscroll);
8290 		break;
8291 	case CTRL('l'):
8292 		view->count = 0;
8293 		tog_free_refs();
8294 		err = tog_load_refs(s->repo, s->sort_by_date);
8295 		if (err)
8296 			break;
8297 		ref_view_free_refs(s);
8298 		err = ref_view_load_refs(s);
8299 		break;
8300 	case KEY_RESIZE:
8301 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8302 			s->selected = view->nlines - 2;
8303 		break;
8304 	default:
8305 		view->count = 0;
8306 		break;
8307 	}
8308 
8309 	return err;
8310 }
8311 
8312 __dead static void
8313 usage_ref(void)
8314 {
8315 	endwin();
8316 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8317 	    getprogname());
8318 	exit(1);
8319 }
8320 
8321 static const struct got_error *
8322 cmd_ref(int argc, char *argv[])
8323 {
8324 	const struct got_error *error;
8325 	struct got_repository *repo = NULL;
8326 	struct got_worktree *worktree = NULL;
8327 	char *cwd = NULL, *repo_path = NULL;
8328 	int ch;
8329 	struct tog_view *view;
8330 	int *pack_fds = NULL;
8331 
8332 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8333 		switch (ch) {
8334 		case 'r':
8335 			repo_path = realpath(optarg, NULL);
8336 			if (repo_path == NULL)
8337 				return got_error_from_errno2("realpath",
8338 				    optarg);
8339 			break;
8340 		default:
8341 			usage_ref();
8342 			/* NOTREACHED */
8343 		}
8344 	}
8345 
8346 	argc -= optind;
8347 	argv += optind;
8348 
8349 	if (argc > 1)
8350 		usage_ref();
8351 
8352 	error = got_repo_pack_fds_open(&pack_fds);
8353 	if (error != NULL)
8354 		goto done;
8355 
8356 	if (repo_path == NULL) {
8357 		cwd = getcwd(NULL, 0);
8358 		if (cwd == NULL)
8359 			return got_error_from_errno("getcwd");
8360 		error = got_worktree_open(&worktree, cwd);
8361 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8362 			goto done;
8363 		if (worktree)
8364 			repo_path =
8365 			    strdup(got_worktree_get_repo_path(worktree));
8366 		else
8367 			repo_path = strdup(cwd);
8368 		if (repo_path == NULL) {
8369 			error = got_error_from_errno("strdup");
8370 			goto done;
8371 		}
8372 	}
8373 
8374 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8375 	if (error != NULL)
8376 		goto done;
8377 
8378 	init_curses();
8379 
8380 	error = apply_unveil(got_repo_get_path(repo), NULL);
8381 	if (error)
8382 		goto done;
8383 
8384 	error = tog_load_refs(repo, 0);
8385 	if (error)
8386 		goto done;
8387 
8388 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8389 	if (view == NULL) {
8390 		error = got_error_from_errno("view_open");
8391 		goto done;
8392 	}
8393 
8394 	error = open_ref_view(view, repo);
8395 	if (error)
8396 		goto done;
8397 
8398 	if (worktree) {
8399 		/* Release work tree lock. */
8400 		got_worktree_close(worktree);
8401 		worktree = NULL;
8402 	}
8403 	error = view_loop(view);
8404 done:
8405 	free(repo_path);
8406 	free(cwd);
8407 	if (repo) {
8408 		const struct got_error *close_err = got_repo_close(repo);
8409 		if (close_err)
8410 			error = close_err;
8411 	}
8412 	if (pack_fds) {
8413 		const struct got_error *pack_err =
8414 		    got_repo_pack_fds_close(pack_fds);
8415 		if (error == NULL)
8416 			error = pack_err;
8417 	}
8418 	tog_free_refs();
8419 	return error;
8420 }
8421 
8422 static const struct got_error*
8423 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8424     const char *str)
8425 {
8426 	size_t len;
8427 
8428 	if (win == NULL)
8429 		win = stdscr;
8430 
8431 	len = strlen(str);
8432 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8433 
8434 	if (focus)
8435 		wstandout(win);
8436 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8437 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8438 	if (focus)
8439 		wstandend(win);
8440 
8441 	return NULL;
8442 }
8443 
8444 static const struct got_error *
8445 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8446 {
8447 	off_t *p;
8448 
8449 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8450 	if (p == NULL) {
8451 		free(*line_offsets);
8452 		*line_offsets = NULL;
8453 		return got_error_from_errno("reallocarray");
8454 	}
8455 
8456 	*line_offsets = p;
8457 	(*line_offsets)[*nlines] = off;
8458 	++(*nlines);
8459 	return NULL;
8460 }
8461 
8462 static const struct got_error *
8463 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8464 {
8465 	*ret = 0;
8466 
8467 	for (;n > 0; --n, ++km) {
8468 		char	*t0, *t, *k;
8469 		size_t	 len = 1;
8470 
8471 		if (km->keys == NULL)
8472 			continue;
8473 
8474 		t = t0 = strdup(km->keys);
8475 		if (t0 == NULL)
8476 			return got_error_from_errno("strdup");
8477 
8478 		len += strlen(t);
8479 		while ((k = strsep(&t, " ")) != NULL)
8480 			len += strlen(k) > 1 ? 2 : 0;
8481 		free(t0);
8482 		*ret = MAX(*ret, len);
8483 	}
8484 
8485 	return NULL;
8486 }
8487 
8488 /*
8489  * Write keymap section headers, keys, and key info in km to f.
8490  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8491  * wrap control and symbolic keys in guillemets, else use <>.
8492  */
8493 static const struct got_error *
8494 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8495 {
8496 	int n, len = width;
8497 
8498 	if (km->keys) {
8499 		static const char *u8_glyph[] = {
8500 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8501 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8502 		};
8503 		char	*t0, *t, *k;
8504 		int	 cs, s, first = 1;
8505 
8506 		cs = got_locale_is_utf8();
8507 
8508 		t = t0 = strdup(km->keys);
8509 		if (t0 == NULL)
8510 			return got_error_from_errno("strdup");
8511 
8512 		len = strlen(km->keys);
8513 		while ((k = strsep(&t, " ")) != NULL) {
8514 			s = strlen(k) > 1;  /* control or symbolic key */
8515 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8516 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8517 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8518 			if (n < 0) {
8519 				free(t0);
8520 				return got_error_from_errno("fprintf");
8521 			}
8522 			first = 0;
8523 			len += s ? 2 : 0;
8524 			*off += n;
8525 		}
8526 		free(t0);
8527 	}
8528 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8529 	if (n < 0)
8530 		return got_error_from_errno("fprintf");
8531 	*off += n;
8532 
8533 	return NULL;
8534 }
8535 
8536 static const struct got_error *
8537 format_help(struct tog_help_view_state *s)
8538 {
8539 	const struct got_error		*err = NULL;
8540 	off_t				 off = 0;
8541 	int				 i, max, n, show = s->all;
8542 	static const struct tog_key_map	 km[] = {
8543 #define KEYMAP_(info, type)	{ NULL, (info), type }
8544 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8545 		GENERATE_HELP
8546 #undef KEYMAP_
8547 #undef KEY_
8548 	};
8549 
8550 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8551 	if (err)
8552 		return err;
8553 
8554 	n = nitems(km);
8555 	err = max_key_str(&max, km, n);
8556 	if (err)
8557 		return err;
8558 
8559 	for (i = 0; i < n; ++i) {
8560 		if (km[i].keys == NULL) {
8561 			show = s->all;
8562 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8563 			    km[i].type == s->type || s->all)
8564 				show = 1;
8565 		}
8566 		if (show) {
8567 			err = format_help_line(&off, s->f, &km[i], max);
8568 			if (err)
8569 				return err;
8570 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8571 			if (err)
8572 				return err;
8573 		}
8574 	}
8575 	fputc('\n', s->f);
8576 	++off;
8577 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8578 	return err;
8579 }
8580 
8581 static const struct got_error *
8582 create_help(struct tog_help_view_state *s)
8583 {
8584 	FILE			*f;
8585 	const struct got_error	*err;
8586 
8587 	free(s->line_offsets);
8588 	s->line_offsets = NULL;
8589 	s->nlines = 0;
8590 
8591 	f = got_opentemp();
8592 	if (f == NULL)
8593 		return got_error_from_errno("got_opentemp");
8594 	s->f = f;
8595 
8596 	err = format_help(s);
8597 	if (err)
8598 		return err;
8599 
8600 	if (s->f && fflush(s->f) != 0)
8601 		return got_error_from_errno("fflush");
8602 
8603 	return NULL;
8604 }
8605 
8606 static const struct got_error *
8607 search_start_help_view(struct tog_view *view)
8608 {
8609 	view->state.help.matched_line = 0;
8610 	return NULL;
8611 }
8612 
8613 static void
8614 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8615     size_t *nlines, int **first, int **last, int **match, int **selected)
8616 {
8617 	struct tog_help_view_state *s = &view->state.help;
8618 
8619 	*f = s->f;
8620 	*nlines = s->nlines;
8621 	*line_offsets = s->line_offsets;
8622 	*match = &s->matched_line;
8623 	*first = &s->first_displayed_line;
8624 	*last = &s->last_displayed_line;
8625 	*selected = &s->selected_line;
8626 }
8627 
8628 static const struct got_error *
8629 show_help_view(struct tog_view *view)
8630 {
8631 	struct tog_help_view_state	*s = &view->state.help;
8632 	const struct got_error		*err;
8633 	regmatch_t			*regmatch = &view->regmatch;
8634 	wchar_t				*wline;
8635 	char				*line;
8636 	ssize_t				 linelen;
8637 	size_t				 linesz = 0;
8638 	int				 width, nprinted = 0, rc = 0;
8639 	int				 eos = view->nlines;
8640 
8641 	if (view_is_hsplit_top(view))
8642 		--eos;  /* account for border */
8643 
8644 	s->lineno = 0;
8645 	rewind(s->f);
8646 	werase(view->window);
8647 
8648 	if (view->gline > s->nlines - 1)
8649 		view->gline = s->nlines - 1;
8650 
8651 	err = win_draw_center(view->window, 0, 0, view->ncols,
8652 	    view_needs_focus_indication(view),
8653 	    "tog help (press q to return to tog)");
8654 	if (err)
8655 		return err;
8656 	if (eos <= 1)
8657 		return NULL;
8658 	waddstr(view->window, "\n\n");
8659 	eos -= 2;
8660 
8661 	s->eof = 0;
8662 	view->maxx = 0;
8663 	line = NULL;
8664 	while (eos > 0 && nprinted < eos) {
8665 		attr_t attr = 0;
8666 
8667 		linelen = getline(&line, &linesz, s->f);
8668 		if (linelen == -1) {
8669 			if (!feof(s->f)) {
8670 				free(line);
8671 				return got_ferror(s->f, GOT_ERR_IO);
8672 			}
8673 			s->eof = 1;
8674 			break;
8675 		}
8676 		if (++s->lineno < s->first_displayed_line)
8677 			continue;
8678 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8679 			continue;
8680 		if (s->lineno == view->hiline)
8681 			attr = A_STANDOUT;
8682 
8683 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8684 		    view->x ? 1 : 0);
8685 		if (err) {
8686 			free(line);
8687 			return err;
8688 		}
8689 		view->maxx = MAX(view->maxx, width);
8690 		free(wline);
8691 		wline = NULL;
8692 
8693 		if (attr)
8694 			wattron(view->window, attr);
8695 		if (s->first_displayed_line + nprinted == s->matched_line &&
8696 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8697 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8698 			    view->window, view->x, regmatch);
8699 			if (err) {
8700 				free(line);
8701 				return err;
8702 			}
8703 		} else {
8704 			int skip;
8705 
8706 			err = format_line(&wline, &width, &skip, line,
8707 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8708 			if (err) {
8709 				free(line);
8710 				return err;
8711 			}
8712 			rc = waddwstr(view->window, &wline[skip]);
8713 			free(wline);
8714 			wline = NULL;
8715 			if (rc == ERR)
8716 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8717 		}
8718 		if (s->lineno == view->hiline) {
8719 			while (width++ < view->ncols)
8720 				waddch(view->window, ' ');
8721 		} else {
8722 			if (width <= view->ncols)
8723 				waddch(view->window, '\n');
8724 		}
8725 		if (attr)
8726 			wattroff(view->window, attr);
8727 		if (++nprinted == 1)
8728 			s->first_displayed_line = s->lineno;
8729 	}
8730 	free(line);
8731 	if (nprinted > 0)
8732 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8733 	else
8734 		s->last_displayed_line = s->first_displayed_line;
8735 
8736 	view_border(view);
8737 
8738 	if (s->eof) {
8739 		rc = waddnstr(view->window,
8740 		    "See the tog(1) manual page for full documentation",
8741 		    view->ncols - 1);
8742 		if (rc == ERR)
8743 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8744 	} else {
8745 		wmove(view->window, view->nlines - 1, 0);
8746 		wclrtoeol(view->window);
8747 		wstandout(view->window);
8748 		rc = waddnstr(view->window, "scroll down for more...",
8749 		    view->ncols - 1);
8750 		if (rc == ERR)
8751 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8752 		if (getcurx(view->window) < view->ncols - 6) {
8753 			rc = wprintw(view->window, "[%.0f%%]",
8754 			    100.00 * s->last_displayed_line / s->nlines);
8755 			if (rc == ERR)
8756 				return got_error_msg(GOT_ERR_IO, "wprintw");
8757 		}
8758 		wstandend(view->window);
8759 	}
8760 
8761 	return NULL;
8762 }
8763 
8764 static const struct got_error *
8765 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8766 {
8767 	struct tog_help_view_state	*s = &view->state.help;
8768 	const struct got_error		*err = NULL;
8769 	char				*line = NULL;
8770 	ssize_t				 linelen;
8771 	size_t				 linesz = 0;
8772 	int				 eos, nscroll;
8773 
8774 	eos = nscroll = view->nlines;
8775 	if (view_is_hsplit_top(view))
8776 		--eos;  /* border */
8777 
8778 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8779 
8780 	switch (ch) {
8781 	case '0':
8782 		view->x = 0;
8783 		break;
8784 	case '$':
8785 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8786 		view->count = 0;
8787 		break;
8788 	case KEY_RIGHT:
8789 	case 'l':
8790 		if (view->x + view->ncols / 3 < view->maxx)
8791 			view->x += 2;
8792 		else
8793 			view->count = 0;
8794 		break;
8795 	case KEY_LEFT:
8796 	case 'h':
8797 		view->x -= MIN(view->x, 2);
8798 		if (view->x <= 0)
8799 			view->count = 0;
8800 		break;
8801 	case 'g':
8802 	case KEY_HOME:
8803 		s->first_displayed_line = 1;
8804 		view->count = 0;
8805 		break;
8806 	case 'G':
8807 	case KEY_END:
8808 		view->count = 0;
8809 		if (s->eof)
8810 			break;
8811 		s->first_displayed_line = (s->nlines - eos) + 3;
8812 		s->eof = 1;
8813 		break;
8814 	case 'k':
8815 	case KEY_UP:
8816 		if (s->first_displayed_line > 1)
8817 			--s->first_displayed_line;
8818 		else
8819 			view->count = 0;
8820 		break;
8821 	case CTRL('u'):
8822 	case 'u':
8823 		nscroll /= 2;
8824 		/* FALL THROUGH */
8825 	case KEY_PPAGE:
8826 	case CTRL('b'):
8827 	case 'b':
8828 		if (s->first_displayed_line == 1) {
8829 			view->count = 0;
8830 			break;
8831 		}
8832 		while (--nscroll > 0 && s->first_displayed_line > 1)
8833 			s->first_displayed_line--;
8834 		break;
8835 	case 'j':
8836 	case KEY_DOWN:
8837 	case CTRL('n'):
8838 		if (!s->eof)
8839 			++s->first_displayed_line;
8840 		else
8841 			view->count = 0;
8842 		break;
8843 	case CTRL('d'):
8844 	case 'd':
8845 		nscroll /= 2;
8846 		/* FALL THROUGH */
8847 	case KEY_NPAGE:
8848 	case CTRL('f'):
8849 	case 'f':
8850 	case ' ':
8851 		if (s->eof) {
8852 			view->count = 0;
8853 			break;
8854 		}
8855 		while (!s->eof && --nscroll > 0) {
8856 			linelen = getline(&line, &linesz, s->f);
8857 			s->first_displayed_line++;
8858 			if (linelen == -1) {
8859 				if (feof(s->f))
8860 					s->eof = 1;
8861 				else
8862 					err = got_ferror(s->f, GOT_ERR_IO);
8863 				break;
8864 			}
8865 		}
8866 		free(line);
8867 		break;
8868 	default:
8869 		view->count = 0;
8870 		break;
8871 	}
8872 
8873 	return err;
8874 }
8875 
8876 static const struct got_error *
8877 close_help_view(struct tog_view *view)
8878 {
8879 	struct tog_help_view_state *s = &view->state.help;
8880 
8881 	free(s->line_offsets);
8882 	s->line_offsets = NULL;
8883 	if (fclose(s->f) == EOF)
8884 		return got_error_from_errno("fclose");
8885 
8886 	return NULL;
8887 }
8888 
8889 static const struct got_error *
8890 reset_help_view(struct tog_view *view)
8891 {
8892 	struct tog_help_view_state *s = &view->state.help;
8893 
8894 
8895 	if (s->f && fclose(s->f) == EOF)
8896 		return got_error_from_errno("fclose");
8897 
8898 	wclear(view->window);
8899 	view->count = 0;
8900 	view->x = 0;
8901 	s->all = !s->all;
8902 	s->first_displayed_line = 1;
8903 	s->last_displayed_line = view->nlines;
8904 	s->matched_line = 0;
8905 
8906 	return create_help(s);
8907 }
8908 
8909 static const struct got_error *
8910 open_help_view(struct tog_view *view, struct tog_view *parent)
8911 {
8912 	const struct got_error		*err = NULL;
8913 	struct tog_help_view_state	*s = &view->state.help;
8914 
8915 	s->type = (enum tog_keymap_type)parent->type;
8916 	s->first_displayed_line = 1;
8917 	s->last_displayed_line = view->nlines;
8918 	s->selected_line = 1;
8919 
8920 	view->show = show_help_view;
8921 	view->input = input_help_view;
8922 	view->reset = reset_help_view;
8923 	view->close = close_help_view;
8924 	view->search_start = search_start_help_view;
8925 	view->search_setup = search_setup_help_view;
8926 	view->search_next = search_next_view_match;
8927 
8928 	err = create_help(s);
8929 	return err;
8930 }
8931 
8932 static const struct got_error *
8933 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8934     enum tog_view_type request, int y, int x)
8935 {
8936 	const struct got_error *err = NULL;
8937 
8938 	*new_view = NULL;
8939 
8940 	switch (request) {
8941 	case TOG_VIEW_DIFF:
8942 		if (view->type == TOG_VIEW_LOG) {
8943 			struct tog_log_view_state *s = &view->state.log;
8944 
8945 			err = open_diff_view_for_commit(new_view, y, x,
8946 			    s->selected_entry->commit, s->selected_entry->id,
8947 			    view, s->repo);
8948 		} else
8949 			return got_error_msg(GOT_ERR_NOT_IMPL,
8950 			    "parent/child view pair not supported");
8951 		break;
8952 	case TOG_VIEW_BLAME:
8953 		if (view->type == TOG_VIEW_TREE) {
8954 			struct tog_tree_view_state *s = &view->state.tree;
8955 
8956 			err = blame_tree_entry(new_view, y, x,
8957 			    s->selected_entry, &s->parents, s->commit_id,
8958 			    s->repo);
8959 		} else
8960 			return got_error_msg(GOT_ERR_NOT_IMPL,
8961 			    "parent/child view pair not supported");
8962 		break;
8963 	case TOG_VIEW_LOG:
8964 		if (view->type == TOG_VIEW_BLAME)
8965 			err = log_annotated_line(new_view, y, x,
8966 			    view->state.blame.repo, view->state.blame.id_to_log);
8967 		else if (view->type == TOG_VIEW_TREE)
8968 			err = log_selected_tree_entry(new_view, y, x,
8969 			    &view->state.tree);
8970 		else if (view->type == TOG_VIEW_REF)
8971 			err = log_ref_entry(new_view, y, x,
8972 			    view->state.ref.selected_entry,
8973 			    view->state.ref.repo);
8974 		else
8975 			return got_error_msg(GOT_ERR_NOT_IMPL,
8976 			    "parent/child view pair not supported");
8977 		break;
8978 	case TOG_VIEW_TREE:
8979 		if (view->type == TOG_VIEW_LOG)
8980 			err = browse_commit_tree(new_view, y, x,
8981 			    view->state.log.selected_entry,
8982 			    view->state.log.in_repo_path,
8983 			    view->state.log.head_ref_name,
8984 			    view->state.log.repo);
8985 		else if (view->type == TOG_VIEW_REF)
8986 			err = browse_ref_tree(new_view, y, x,
8987 			    view->state.ref.selected_entry,
8988 			    view->state.ref.repo);
8989 		else
8990 			return got_error_msg(GOT_ERR_NOT_IMPL,
8991 			    "parent/child view pair not supported");
8992 		break;
8993 	case TOG_VIEW_REF:
8994 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8995 		if (*new_view == NULL)
8996 			return got_error_from_errno("view_open");
8997 		if (view->type == TOG_VIEW_LOG)
8998 			err = open_ref_view(*new_view, view->state.log.repo);
8999 		else if (view->type == TOG_VIEW_TREE)
9000 			err = open_ref_view(*new_view, view->state.tree.repo);
9001 		else
9002 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9003 			    "parent/child view pair not supported");
9004 		if (err)
9005 			view_close(*new_view);
9006 		break;
9007 	case TOG_VIEW_HELP:
9008 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9009 		if (*new_view == NULL)
9010 			return got_error_from_errno("view_open");
9011 		err = open_help_view(*new_view, view);
9012 		if (err)
9013 			view_close(*new_view);
9014 		break;
9015 	default:
9016 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9017 	}
9018 
9019 	return err;
9020 }
9021 
9022 /*
9023  * If view was scrolled down to move the selected line into view when opening a
9024  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9025  */
9026 static void
9027 offset_selection_up(struct tog_view *view)
9028 {
9029 	switch (view->type) {
9030 	case TOG_VIEW_BLAME: {
9031 		struct tog_blame_view_state *s = &view->state.blame;
9032 		if (s->first_displayed_line == 1) {
9033 			s->selected_line = MAX(s->selected_line - view->offset,
9034 			    1);
9035 			break;
9036 		}
9037 		if (s->first_displayed_line > view->offset)
9038 			s->first_displayed_line -= view->offset;
9039 		else
9040 			s->first_displayed_line = 1;
9041 		s->selected_line += view->offset;
9042 		break;
9043 	}
9044 	case TOG_VIEW_LOG:
9045 		log_scroll_up(&view->state.log, view->offset);
9046 		view->state.log.selected += view->offset;
9047 		break;
9048 	case TOG_VIEW_REF:
9049 		ref_scroll_up(&view->state.ref, view->offset);
9050 		view->state.ref.selected += view->offset;
9051 		break;
9052 	case TOG_VIEW_TREE:
9053 		tree_scroll_up(&view->state.tree, view->offset);
9054 		view->state.tree.selected += view->offset;
9055 		break;
9056 	default:
9057 		break;
9058 	}
9059 
9060 	view->offset = 0;
9061 }
9062 
9063 /*
9064  * If the selected line is in the section of screen covered by the bottom split,
9065  * scroll down offset lines to move it into view and index its new position.
9066  */
9067 static const struct got_error *
9068 offset_selection_down(struct tog_view *view)
9069 {
9070 	const struct got_error	*err = NULL;
9071 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9072 	int			*selected = NULL;
9073 	int			 header, offset;
9074 
9075 	switch (view->type) {
9076 	case TOG_VIEW_BLAME: {
9077 		struct tog_blame_view_state *s = &view->state.blame;
9078 		header = 3;
9079 		scrolld = NULL;
9080 		if (s->selected_line > view->nlines - header) {
9081 			offset = abs(view->nlines - s->selected_line - header);
9082 			s->first_displayed_line += offset;
9083 			s->selected_line -= offset;
9084 			view->offset = offset;
9085 		}
9086 		break;
9087 	}
9088 	case TOG_VIEW_LOG: {
9089 		struct tog_log_view_state *s = &view->state.log;
9090 		scrolld = &log_scroll_down;
9091 		header = view_is_parent_view(view) ? 3 : 2;
9092 		selected = &s->selected;
9093 		break;
9094 	}
9095 	case TOG_VIEW_REF: {
9096 		struct tog_ref_view_state *s = &view->state.ref;
9097 		scrolld = &ref_scroll_down;
9098 		header = 3;
9099 		selected = &s->selected;
9100 		break;
9101 	}
9102 	case TOG_VIEW_TREE: {
9103 		struct tog_tree_view_state *s = &view->state.tree;
9104 		scrolld = &tree_scroll_down;
9105 		header = 5;
9106 		selected = &s->selected;
9107 		break;
9108 	}
9109 	default:
9110 		selected = NULL;
9111 		scrolld = NULL;
9112 		header = 0;
9113 		break;
9114 	}
9115 
9116 	if (selected && *selected > view->nlines - header) {
9117 		offset = abs(view->nlines - *selected - header);
9118 		view->offset = offset;
9119 		if (scrolld && offset) {
9120 			err = scrolld(view, offset);
9121 			*selected -= offset;
9122 		}
9123 	}
9124 
9125 	return err;
9126 }
9127 
9128 static void
9129 list_commands(FILE *fp)
9130 {
9131 	size_t i;
9132 
9133 	fprintf(fp, "commands:");
9134 	for (i = 0; i < nitems(tog_commands); i++) {
9135 		const struct tog_cmd *cmd = &tog_commands[i];
9136 		fprintf(fp, " %s", cmd->name);
9137 	}
9138 	fputc('\n', fp);
9139 }
9140 
9141 __dead static void
9142 usage(int hflag, int status)
9143 {
9144 	FILE *fp = (status == 0) ? stdout : stderr;
9145 
9146 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9147 	    getprogname());
9148 	if (hflag) {
9149 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9150 		list_commands(fp);
9151 	}
9152 	exit(status);
9153 }
9154 
9155 static char **
9156 make_argv(int argc, ...)
9157 {
9158 	va_list ap;
9159 	char **argv;
9160 	int i;
9161 
9162 	va_start(ap, argc);
9163 
9164 	argv = calloc(argc, sizeof(char *));
9165 	if (argv == NULL)
9166 		err(1, "calloc");
9167 	for (i = 0; i < argc; i++) {
9168 		argv[i] = strdup(va_arg(ap, char *));
9169 		if (argv[i] == NULL)
9170 			err(1, "strdup");
9171 	}
9172 
9173 	va_end(ap);
9174 	return argv;
9175 }
9176 
9177 /*
9178  * Try to convert 'tog path' into a 'tog log path' command.
9179  * The user could simply have mistyped the command rather than knowingly
9180  * provided a path. So check whether argv[0] can in fact be resolved
9181  * to a path in the HEAD commit and print a special error if not.
9182  * This hack is for mpi@ <3
9183  */
9184 static const struct got_error *
9185 tog_log_with_path(int argc, char *argv[])
9186 {
9187 	const struct got_error *error = NULL, *close_err;
9188 	const struct tog_cmd *cmd = NULL;
9189 	struct got_repository *repo = NULL;
9190 	struct got_worktree *worktree = NULL;
9191 	struct got_object_id *commit_id = NULL, *id = NULL;
9192 	struct got_commit_object *commit = NULL;
9193 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9194 	char *commit_id_str = NULL, **cmd_argv = NULL;
9195 	int *pack_fds = NULL;
9196 
9197 	cwd = getcwd(NULL, 0);
9198 	if (cwd == NULL)
9199 		return got_error_from_errno("getcwd");
9200 
9201 	error = got_repo_pack_fds_open(&pack_fds);
9202 	if (error != NULL)
9203 		goto done;
9204 
9205 	error = got_worktree_open(&worktree, cwd);
9206 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9207 		goto done;
9208 
9209 	if (worktree)
9210 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9211 	else
9212 		repo_path = strdup(cwd);
9213 	if (repo_path == NULL) {
9214 		error = got_error_from_errno("strdup");
9215 		goto done;
9216 	}
9217 
9218 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9219 	if (error != NULL)
9220 		goto done;
9221 
9222 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9223 	    repo, worktree);
9224 	if (error)
9225 		goto done;
9226 
9227 	error = tog_load_refs(repo, 0);
9228 	if (error)
9229 		goto done;
9230 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9231 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9232 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9233 	if (error)
9234 		goto done;
9235 
9236 	if (worktree) {
9237 		got_worktree_close(worktree);
9238 		worktree = NULL;
9239 	}
9240 
9241 	error = got_object_open_as_commit(&commit, repo, commit_id);
9242 	if (error)
9243 		goto done;
9244 
9245 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9246 	if (error) {
9247 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9248 			goto done;
9249 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9250 		    getprogname(), argv[0]);
9251 		usage(1, 1);
9252 		/* not reached */
9253 	}
9254 
9255 	error = got_object_id_str(&commit_id_str, commit_id);
9256 	if (error)
9257 		goto done;
9258 
9259 	cmd = &tog_commands[0]; /* log */
9260 	argc = 4;
9261 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9262 	error = cmd->cmd_main(argc, cmd_argv);
9263 done:
9264 	if (repo) {
9265 		close_err = got_repo_close(repo);
9266 		if (error == NULL)
9267 			error = close_err;
9268 	}
9269 	if (commit)
9270 		got_object_commit_close(commit);
9271 	if (worktree)
9272 		got_worktree_close(worktree);
9273 	if (pack_fds) {
9274 		const struct got_error *pack_err =
9275 		    got_repo_pack_fds_close(pack_fds);
9276 		if (error == NULL)
9277 			error = pack_err;
9278 	}
9279 	free(id);
9280 	free(commit_id_str);
9281 	free(commit_id);
9282 	free(cwd);
9283 	free(repo_path);
9284 	free(in_repo_path);
9285 	if (cmd_argv) {
9286 		int i;
9287 		for (i = 0; i < argc; i++)
9288 			free(cmd_argv[i]);
9289 		free(cmd_argv);
9290 	}
9291 	tog_free_refs();
9292 	return error;
9293 }
9294 
9295 int
9296 main(int argc, char *argv[])
9297 {
9298 	const struct got_error *error = NULL;
9299 	const struct tog_cmd *cmd = NULL;
9300 	int ch, hflag = 0, Vflag = 0;
9301 	char **cmd_argv = NULL;
9302 	static const struct option longopts[] = {
9303 	    { "version", no_argument, NULL, 'V' },
9304 	    { NULL, 0, NULL, 0}
9305 	};
9306 	char *diff_algo_str = NULL;
9307 
9308 	if (!isatty(STDIN_FILENO))
9309 		errx(1, "standard input is not a tty");
9310 
9311 	setlocale(LC_CTYPE, "");
9312 
9313 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9314 		switch (ch) {
9315 		case 'h':
9316 			hflag = 1;
9317 			break;
9318 		case 'V':
9319 			Vflag = 1;
9320 			break;
9321 		default:
9322 			usage(hflag, 1);
9323 			/* NOTREACHED */
9324 		}
9325 	}
9326 
9327 	argc -= optind;
9328 	argv += optind;
9329 	optind = 1;
9330 	optreset = 1;
9331 
9332 	if (Vflag) {
9333 		got_version_print_str();
9334 		return 0;
9335 	}
9336 
9337 #ifndef PROFILE
9338 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9339 	    NULL) == -1)
9340 		err(1, "pledge");
9341 #endif
9342 
9343 	if (argc == 0) {
9344 		if (hflag)
9345 			usage(hflag, 0);
9346 		/* Build an argument vector which runs a default command. */
9347 		cmd = &tog_commands[0];
9348 		argc = 1;
9349 		cmd_argv = make_argv(argc, cmd->name);
9350 	} else {
9351 		size_t i;
9352 
9353 		/* Did the user specify a command? */
9354 		for (i = 0; i < nitems(tog_commands); i++) {
9355 			if (strncmp(tog_commands[i].name, argv[0],
9356 			    strlen(argv[0])) == 0) {
9357 				cmd = &tog_commands[i];
9358 				break;
9359 			}
9360 		}
9361 	}
9362 
9363 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9364 	if (diff_algo_str) {
9365 		if (strcasecmp(diff_algo_str, "patience") == 0)
9366 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9367 		if (strcasecmp(diff_algo_str, "myers") == 0)
9368 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9369 	}
9370 
9371 	if (cmd == NULL) {
9372 		if (argc != 1)
9373 			usage(0, 1);
9374 		/* No command specified; try log with a path */
9375 		error = tog_log_with_path(argc, argv);
9376 	} else {
9377 		if (hflag)
9378 			cmd->cmd_usage();
9379 		else
9380 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9381 	}
9382 
9383 	endwin();
9384 	putchar('\n');
9385 	if (cmd_argv) {
9386 		int i;
9387 		for (i = 0; i < argc; i++)
9388 			free(cmd_argv[i]);
9389 		free(cmd_argv);
9390 	}
9391 
9392 	if (error && error->code != GOT_ERR_CANCELLED &&
9393 	    error->code != GOT_ERR_EOF &&
9394 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9395 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9396 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9397 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9398 	return 0;
9399 }