1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 
60 #ifndef MIN
61 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
62 #endif
63 
64 #ifndef MAX
65 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
66 #endif
67 
68 #define CTRL(x)		((x) & 0x1f)
69 
70 #ifndef nitems
71 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
72 #endif
73 
74 struct tog_cmd {
75 	const char *name;
76 	const struct got_error *(*cmd_main)(int, char *[]);
77 	void (*cmd_usage)(void);
78 };
79 
80 __dead static void	usage(int, int);
81 __dead static void	usage_log(void);
82 __dead static void	usage_diff(void);
83 __dead static void	usage_blame(void);
84 __dead static void	usage_tree(void);
85 __dead static void	usage_ref(void);
86 
87 static const struct got_error*	cmd_log(int, char *[]);
88 static const struct got_error*	cmd_diff(int, char *[]);
89 static const struct got_error*	cmd_blame(int, char *[]);
90 static const struct got_error*	cmd_tree(int, char *[]);
91 static const struct got_error*	cmd_ref(int, char *[]);
92 
93 static const struct tog_cmd tog_commands[] = {
94 	{ "log",	cmd_log,	usage_log },
95 	{ "diff",	cmd_diff,	usage_diff },
96 	{ "blame",	cmd_blame,	usage_blame },
97 	{ "tree",	cmd_tree,	usage_tree },
98 	{ "ref",	cmd_ref,	usage_ref },
99 };
100 
101 enum tog_view_type {
102 	TOG_VIEW_DIFF,
103 	TOG_VIEW_LOG,
104 	TOG_VIEW_BLAME,
105 	TOG_VIEW_TREE,
106 	TOG_VIEW_REF,
107 	TOG_VIEW_HELP
108 };
109 
110 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
111 enum tog_keymap_type {
112 	TOG_KEYMAP_KEYS = -2,
113 	TOG_KEYMAP_GLOBAL,
114 	TOG_KEYMAP_DIFF,
115 	TOG_KEYMAP_LOG,
116 	TOG_KEYMAP_BLAME,
117 	TOG_KEYMAP_TREE,
118 	TOG_KEYMAP_REF,
119 	TOG_KEYMAP_HELP
120 };
121 
122 enum tog_view_mode {
123 	TOG_VIEW_SPLIT_NONE,
124 	TOG_VIEW_SPLIT_VERT,
125 	TOG_VIEW_SPLIT_HRZN
126 };
127 
128 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
129 
130 #define TOG_EOF_STRING	"(END)"
131 
132 struct commit_queue_entry {
133 	TAILQ_ENTRY(commit_queue_entry) entry;
134 	struct got_object_id *id;
135 	struct got_commit_object *commit;
136 	int idx;
137 };
138 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
139 struct commit_queue {
140 	int ncommits;
141 	struct commit_queue_head head;
142 };
143 
144 struct tog_color {
145 	STAILQ_ENTRY(tog_color) entry;
146 	regex_t regex;
147 	short colorpair;
148 };
149 STAILQ_HEAD(tog_colors, tog_color);
150 
151 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
152 static struct got_reflist_object_id_map *tog_refs_idmap;
153 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
154 
155 static const struct got_error *
156 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
157     struct got_reference* re2)
158 {
159 	const char *name1 = got_ref_get_name(re1);
160 	const char *name2 = got_ref_get_name(re2);
161 	int isbackup1, isbackup2;
162 
163 	/* Sort backup refs towards the bottom of the list. */
164 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
165 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
166 	if (!isbackup1 && isbackup2) {
167 		*cmp = -1;
168 		return NULL;
169 	} else if (isbackup1 && !isbackup2) {
170 		*cmp = 1;
171 		return NULL;
172 	}
173 
174 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
175 	return NULL;
176 }
177 
178 static const struct got_error *
179 tog_load_refs(struct got_repository *repo, int sort_by_date)
180 {
181 	const struct got_error *err;
182 
183 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
184 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
185 	    repo);
186 	if (err)
187 		return err;
188 
189 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
190 	    repo);
191 }
192 
193 static void
194 tog_free_refs(void)
195 {
196 	if (tog_refs_idmap) {
197 		got_reflist_object_id_map_free(tog_refs_idmap);
198 		tog_refs_idmap = NULL;
199 	}
200 	got_ref_list_free(&tog_refs);
201 }
202 
203 static const struct got_error *
204 add_color(struct tog_colors *colors, const char *pattern,
205     int idx, short color)
206 {
207 	const struct got_error *err = NULL;
208 	struct tog_color *tc;
209 	int regerr = 0;
210 
211 	if (idx < 1 || idx > COLOR_PAIRS - 1)
212 		return NULL;
213 
214 	init_pair(idx, color, -1);
215 
216 	tc = calloc(1, sizeof(*tc));
217 	if (tc == NULL)
218 		return got_error_from_errno("calloc");
219 	regerr = regcomp(&tc->regex, pattern,
220 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
221 	if (regerr) {
222 		static char regerr_msg[512];
223 		static char err_msg[512];
224 		regerror(regerr, &tc->regex, regerr_msg,
225 		    sizeof(regerr_msg));
226 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
227 		    regerr_msg);
228 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
229 		free(tc);
230 		return err;
231 	}
232 	tc->colorpair = idx;
233 	STAILQ_INSERT_HEAD(colors, tc, entry);
234 	return NULL;
235 }
236 
237 static void
238 free_colors(struct tog_colors *colors)
239 {
240 	struct tog_color *tc;
241 
242 	while (!STAILQ_EMPTY(colors)) {
243 		tc = STAILQ_FIRST(colors);
244 		STAILQ_REMOVE_HEAD(colors, entry);
245 		regfree(&tc->regex);
246 		free(tc);
247 	}
248 }
249 
250 static struct tog_color *
251 get_color(struct tog_colors *colors, int colorpair)
252 {
253 	struct tog_color *tc = NULL;
254 
255 	STAILQ_FOREACH(tc, colors, entry) {
256 		if (tc->colorpair == colorpair)
257 			return tc;
258 	}
259 
260 	return NULL;
261 }
262 
263 static int
264 default_color_value(const char *envvar)
265 {
266 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
267 		return COLOR_MAGENTA;
268 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
269 		return COLOR_CYAN;
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
271 		return COLOR_YELLOW;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
273 		return COLOR_GREEN;
274 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
275 		return COLOR_MAGENTA;
276 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
281 		return COLOR_GREEN;
282 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
287 		return COLOR_YELLOW;
288 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
291 		return COLOR_MAGENTA;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
295 		return COLOR_CYAN;
296 
297 	return -1;
298 }
299 
300 static int
301 get_color_value(const char *envvar)
302 {
303 	const char *val = getenv(envvar);
304 
305 	if (val == NULL)
306 		return default_color_value(envvar);
307 
308 	if (strcasecmp(val, "black") == 0)
309 		return COLOR_BLACK;
310 	if (strcasecmp(val, "red") == 0)
311 		return COLOR_RED;
312 	if (strcasecmp(val, "green") == 0)
313 		return COLOR_GREEN;
314 	if (strcasecmp(val, "yellow") == 0)
315 		return COLOR_YELLOW;
316 	if (strcasecmp(val, "blue") == 0)
317 		return COLOR_BLUE;
318 	if (strcasecmp(val, "magenta") == 0)
319 		return COLOR_MAGENTA;
320 	if (strcasecmp(val, "cyan") == 0)
321 		return COLOR_CYAN;
322 	if (strcasecmp(val, "white") == 0)
323 		return COLOR_WHITE;
324 	if (strcasecmp(val, "default") == 0)
325 		return -1;
326 
327 	return default_color_value(envvar);
328 }
329 
330 struct tog_diff_view_state {
331 	struct got_object_id *id1, *id2;
332 	const char *label1, *label2;
333 	FILE *f, *f1, *f2;
334 	int fd1, fd2;
335 	int lineno;
336 	int first_displayed_line;
337 	int last_displayed_line;
338 	int eof;
339 	int diff_context;
340 	int ignore_whitespace;
341 	int force_text_diff;
342 	struct got_repository *repo;
343 	struct got_diff_line *lines;
344 	size_t nlines;
345 	int matched_line;
346 	int selected_line;
347 
348 	/* passed from log or blame view; may be NULL */
349 	struct tog_view *parent_view;
350 };
351 
352 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
353 static volatile sig_atomic_t tog_thread_error;
354 
355 struct tog_log_thread_args {
356 	pthread_cond_t need_commits;
357 	pthread_cond_t commit_loaded;
358 	int commits_needed;
359 	int load_all;
360 	struct got_commit_graph *graph;
361 	struct commit_queue *real_commits;
362 	const char *in_repo_path;
363 	struct got_object_id *start_id;
364 	struct got_repository *repo;
365 	int *pack_fds;
366 	int log_complete;
367 	sig_atomic_t *quit;
368 	struct commit_queue_entry **first_displayed_entry;
369 	struct commit_queue_entry **selected_entry;
370 	int *searching;
371 	int *search_next_done;
372 	regex_t *regex;
373 	int *limiting;
374 	int limit_match;
375 	regex_t *limit_regex;
376 	struct commit_queue *limit_commits;
377 };
378 
379 struct tog_log_view_state {
380 	struct commit_queue *commits;
381 	struct commit_queue_entry *first_displayed_entry;
382 	struct commit_queue_entry *last_displayed_entry;
383 	struct commit_queue_entry *selected_entry;
384 	struct commit_queue real_commits;
385 	int selected;
386 	char *in_repo_path;
387 	char *head_ref_name;
388 	int log_branches;
389 	struct got_repository *repo;
390 	struct got_object_id *start_id;
391 	sig_atomic_t quit;
392 	pthread_t thread;
393 	struct tog_log_thread_args thread_args;
394 	struct commit_queue_entry *matched_entry;
395 	struct commit_queue_entry *search_entry;
396 	struct tog_colors colors;
397 	int use_committer;
398 	int limit_view;
399 	regex_t limit_regex;
400 	struct commit_queue limit_commits;
401 };
402 
403 #define TOG_COLOR_DIFF_MINUS		1
404 #define TOG_COLOR_DIFF_PLUS		2
405 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
406 #define TOG_COLOR_DIFF_META		4
407 #define TOG_COLOR_TREE_SUBMODULE	5
408 #define TOG_COLOR_TREE_SYMLINK		6
409 #define TOG_COLOR_TREE_DIRECTORY	7
410 #define TOG_COLOR_TREE_EXECUTABLE	8
411 #define TOG_COLOR_COMMIT		9
412 #define TOG_COLOR_AUTHOR		10
413 #define TOG_COLOR_DATE			11
414 #define TOG_COLOR_REFS_HEADS		12
415 #define TOG_COLOR_REFS_TAGS		13
416 #define TOG_COLOR_REFS_REMOTES		14
417 #define TOG_COLOR_REFS_BACKUP		15
418 
419 struct tog_blame_cb_args {
420 	struct tog_blame_line *lines; /* one per line */
421 	int nlines;
422 
423 	struct tog_view *view;
424 	struct got_object_id *commit_id;
425 	int *quit;
426 };
427 
428 struct tog_blame_thread_args {
429 	const char *path;
430 	struct got_repository *repo;
431 	struct tog_blame_cb_args *cb_args;
432 	int *complete;
433 	got_cancel_cb cancel_cb;
434 	void *cancel_arg;
435 };
436 
437 struct tog_blame {
438 	FILE *f;
439 	off_t filesize;
440 	struct tog_blame_line *lines;
441 	int nlines;
442 	off_t *line_offsets;
443 	pthread_t thread;
444 	struct tog_blame_thread_args thread_args;
445 	struct tog_blame_cb_args cb_args;
446 	const char *path;
447 	int *pack_fds;
448 };
449 
450 struct tog_blame_view_state {
451 	int first_displayed_line;
452 	int last_displayed_line;
453 	int selected_line;
454 	int last_diffed_line;
455 	int blame_complete;
456 	int eof;
457 	int done;
458 	struct got_object_id_queue blamed_commits;
459 	struct got_object_qid *blamed_commit;
460 	char *path;
461 	struct got_repository *repo;
462 	struct got_object_id *commit_id;
463 	struct got_object_id *id_to_log;
464 	struct tog_blame blame;
465 	int matched_line;
466 	struct tog_colors colors;
467 };
468 
469 struct tog_parent_tree {
470 	TAILQ_ENTRY(tog_parent_tree) entry;
471 	struct got_tree_object *tree;
472 	struct got_tree_entry *first_displayed_entry;
473 	struct got_tree_entry *selected_entry;
474 	int selected;
475 };
476 
477 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
478 
479 struct tog_tree_view_state {
480 	char *tree_label;
481 	struct got_object_id *commit_id;/* commit which this tree belongs to */
482 	struct got_tree_object *root;	/* the commit's root tree entry */
483 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
484 	struct got_tree_entry *first_displayed_entry;
485 	struct got_tree_entry *last_displayed_entry;
486 	struct got_tree_entry *selected_entry;
487 	int ndisplayed, selected, show_ids;
488 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
489 	char *head_ref_name;
490 	struct got_repository *repo;
491 	struct got_tree_entry *matched_entry;
492 	struct tog_colors colors;
493 };
494 
495 struct tog_reflist_entry {
496 	TAILQ_ENTRY(tog_reflist_entry) entry;
497 	struct got_reference *ref;
498 	int idx;
499 };
500 
501 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
502 
503 struct tog_ref_view_state {
504 	struct tog_reflist_head refs;
505 	struct tog_reflist_entry *first_displayed_entry;
506 	struct tog_reflist_entry *last_displayed_entry;
507 	struct tog_reflist_entry *selected_entry;
508 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
509 	struct got_repository *repo;
510 	struct tog_reflist_entry *matched_entry;
511 	struct tog_colors colors;
512 };
513 
514 struct tog_help_view_state {
515 	FILE			*f;
516 	off_t			*line_offsets;
517 	size_t			 nlines;
518 	int			 lineno;
519 	int			 first_displayed_line;
520 	int			 last_displayed_line;
521 	int			 eof;
522 	int			 matched_line;
523 	int			 selected_line;
524 	int			 all;
525 	enum tog_keymap_type	 type;
526 };
527 
528 #define GENERATE_HELP \
529 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
530 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
531 	KEY_("k C-p Up", "Move cursor or page up one line"), \
532 	KEY_("j C-n Down", "Move cursor or page down one line"), \
533 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
534 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
535 	KEY_("C-u u", "Scroll the view up one half page"), \
536 	KEY_("C-d d", "Scroll the view down one half page"), \
537 	KEY_("g", "Go to line N (default: first line)"), \
538 	KEY_("Home =", "Go to the first line"), \
539 	KEY_("G", "Go to line N (default: last line)"), \
540 	KEY_("End *", "Go to the last line"), \
541 	KEY_("l Right", "Scroll the view right"), \
542 	KEY_("h Left", "Scroll the view left"), \
543 	KEY_("$", "Scroll view to the rightmost position"), \
544 	KEY_("0", "Scroll view to the leftmost position"), \
545 	KEY_("-", "Decrease size of the focussed split"), \
546 	KEY_("+", "Increase size of the focussed split"), \
547 	KEY_("Tab", "Switch focus between views"), \
548 	KEY_("F", "Toggle fullscreen mode"), \
549 	KEY_("S", "Switch split-screen layout"), \
550 	KEY_("/", "Open prompt to enter search term"), \
551 	KEY_("n", "Find next line/token matching the current search term"), \
552 	KEY_("N", "Find previous line/token matching the current search term"),\
553 	KEY_("q", "Quit the focussed view; Quit help screen"), \
554 	KEY_("Q", "Quit tog"), \
555 	\
556 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
557 	KEY_("< ,", "Move cursor up one commit"), \
558 	KEY_("> .", "Move cursor down one commit"), \
559 	KEY_("Enter", "Open diff view of the selected commit"), \
560 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
561 	KEY_("R", "Open ref view of all repository references"), \
562 	KEY_("T", "Display tree view of the repository from the selected" \
563 	    " commit"), \
564 	KEY_("@", "Toggle between displaying author and committer name"), \
565 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
566 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
567 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
568 	\
569 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
570 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
571 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
572 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
573 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
574 	    " data"), \
575 	KEY_("(", "Go to the previous file in the diff"), \
576 	KEY_(")", "Go to the next file in the diff"), \
577 	KEY_("{", "Go to the previous hunk in the diff"), \
578 	KEY_("}", "Go to the next hunk in the diff"), \
579 	KEY_("[", "Decrease the number of context lines"), \
580 	KEY_("]", "Increase the number of context lines"), \
581 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
582 	\
583 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
584 	KEY_("Enter", "Display diff view of the selected line's commit"), \
585 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
586 	KEY_("L", "Open log view for the currently selected annotated line"), \
587 	KEY_("C", "Reload view with the previously blamed commit"), \
588 	KEY_("c", "Reload view with the version of the file found in the" \
589 	    " selected line's commit"), \
590 	KEY_("p", "Reload view with the version of the file found in the" \
591 	    " selected line's parent commit"), \
592 	\
593 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
594 	KEY_("Enter", "Enter selected directory or open blame view of the" \
595 	    " selected file"), \
596 	KEY_("L", "Open log view for the selected entry"), \
597 	KEY_("R", "Open ref view of all repository references"), \
598 	KEY_("i", "Show object IDs for all tree entries"), \
599 	KEY_("Backspace", "Return to the parent directory"), \
600 	\
601 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
602 	KEY_("Enter", "Display log view of the selected reference"), \
603 	KEY_("T", "Display tree view of the selected reference"), \
604 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
605 	KEY_("m", "Toggle display of last modified date for each reference"), \
606 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
607 	KEY_("C-l", "Reload view with all repository references")
608 
609 struct tog_key_map {
610 	const char		*keys;
611 	const char		*info;
612 	enum tog_keymap_type	 type;
613 };
614 
615 /* curses io for tog regress */
616 struct tog_io {
617 	FILE	*cin;
618 	FILE	*cout;
619 	FILE	*f;
620 } tog_io;
621 static int using_mock_io;
622 
623 #define TOG_SCREEN_DUMP		"SCREENDUMP"
624 #define TOG_SCREEN_DUMP_LEN	(sizeof(TOG_SCREEN_DUMP) - 1)
625 #define TOG_KEY_SCRDUMP		SHRT_MIN
626 
627 /*
628  * We implement two types of views: parent views and child views.
629  *
630  * The 'Tab' key switches focus between a parent view and its child view.
631  * Child views are shown side-by-side to their parent view, provided
632  * there is enough screen estate.
633  *
634  * When a new view is opened from within a parent view, this new view
635  * becomes a child view of the parent view, replacing any existing child.
636  *
637  * When a new view is opened from within a child view, this new view
638  * becomes a parent view which will obscure the views below until the
639  * user quits the new parent view by typing 'q'.
640  *
641  * This list of views contains parent views only.
642  * Child views are only pointed to by their parent view.
643  */
644 TAILQ_HEAD(tog_view_list_head, tog_view);
645 
646 struct tog_view {
647 	TAILQ_ENTRY(tog_view) entry;
648 	WINDOW *window;
649 	PANEL *panel;
650 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
651 	int resized_y, resized_x; /* begin_y/x based on user resizing */
652 	int maxx, x; /* max column and current start column */
653 	int lines, cols; /* copies of LINES and COLS */
654 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
655 	int gline, hiline; /* navigate to and highlight this nG line */
656 	int ch, count; /* current keymap and count prefix */
657 	int resized; /* set when in a resize event */
658 	int focussed; /* Only set on one parent or child view at a time. */
659 	int dying;
660 	struct tog_view *parent;
661 	struct tog_view *child;
662 
663 	/*
664 	 * This flag is initially set on parent views when a new child view
665 	 * is created. It gets toggled when the 'Tab' key switches focus
666 	 * between parent and child.
667 	 * The flag indicates whether focus should be passed on to our child
668 	 * view if this parent view gets picked for focus after another parent
669 	 * view was closed. This prevents child views from losing focus in such
670 	 * situations.
671 	 */
672 	int focus_child;
673 
674 	enum tog_view_mode mode;
675 	/* type-specific state */
676 	enum tog_view_type type;
677 	union {
678 		struct tog_diff_view_state diff;
679 		struct tog_log_view_state log;
680 		struct tog_blame_view_state blame;
681 		struct tog_tree_view_state tree;
682 		struct tog_ref_view_state ref;
683 		struct tog_help_view_state help;
684 	} state;
685 
686 	const struct got_error *(*show)(struct tog_view *);
687 	const struct got_error *(*input)(struct tog_view **,
688 	    struct tog_view *, int);
689 	const struct got_error *(*reset)(struct tog_view *);
690 	const struct got_error *(*resize)(struct tog_view *, int);
691 	const struct got_error *(*close)(struct tog_view *);
692 
693 	const struct got_error *(*search_start)(struct tog_view *);
694 	const struct got_error *(*search_next)(struct tog_view *);
695 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
696 	    int **, int **, int **, int **);
697 	int search_started;
698 	int searching;
699 #define TOG_SEARCH_FORWARD	1
700 #define TOG_SEARCH_BACKWARD	2
701 	int search_next_done;
702 #define TOG_SEARCH_HAVE_MORE	1
703 #define TOG_SEARCH_NO_MORE	2
704 #define TOG_SEARCH_HAVE_NONE	3
705 	regex_t regex;
706 	regmatch_t regmatch;
707 	const char *action;
708 };
709 
710 static const struct got_error *open_diff_view(struct tog_view *,
711     struct got_object_id *, struct got_object_id *,
712     const char *, const char *, int, int, int, struct tog_view *,
713     struct got_repository *);
714 static const struct got_error *show_diff_view(struct tog_view *);
715 static const struct got_error *input_diff_view(struct tog_view **,
716     struct tog_view *, int);
717 static const struct got_error *reset_diff_view(struct tog_view *);
718 static const struct got_error* close_diff_view(struct tog_view *);
719 static const struct got_error *search_start_diff_view(struct tog_view *);
720 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
721     size_t *, int **, int **, int **, int **);
722 static const struct got_error *search_next_view_match(struct tog_view *);
723 
724 static const struct got_error *open_log_view(struct tog_view *,
725     struct got_object_id *, struct got_repository *,
726     const char *, const char *, int);
727 static const struct got_error * show_log_view(struct tog_view *);
728 static const struct got_error *input_log_view(struct tog_view **,
729     struct tog_view *, int);
730 static const struct got_error *resize_log_view(struct tog_view *, int);
731 static const struct got_error *close_log_view(struct tog_view *);
732 static const struct got_error *search_start_log_view(struct tog_view *);
733 static const struct got_error *search_next_log_view(struct tog_view *);
734 
735 static const struct got_error *open_blame_view(struct tog_view *, char *,
736     struct got_object_id *, struct got_repository *);
737 static const struct got_error *show_blame_view(struct tog_view *);
738 static const struct got_error *input_blame_view(struct tog_view **,
739     struct tog_view *, int);
740 static const struct got_error *reset_blame_view(struct tog_view *);
741 static const struct got_error *close_blame_view(struct tog_view *);
742 static const struct got_error *search_start_blame_view(struct tog_view *);
743 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
744     size_t *, int **, int **, int **, int **);
745 
746 static const struct got_error *open_tree_view(struct tog_view *,
747     struct got_object_id *, const char *, struct got_repository *);
748 static const struct got_error *show_tree_view(struct tog_view *);
749 static const struct got_error *input_tree_view(struct tog_view **,
750     struct tog_view *, int);
751 static const struct got_error *close_tree_view(struct tog_view *);
752 static const struct got_error *search_start_tree_view(struct tog_view *);
753 static const struct got_error *search_next_tree_view(struct tog_view *);
754 
755 static const struct got_error *open_ref_view(struct tog_view *,
756     struct got_repository *);
757 static const struct got_error *show_ref_view(struct tog_view *);
758 static const struct got_error *input_ref_view(struct tog_view **,
759     struct tog_view *, int);
760 static const struct got_error *close_ref_view(struct tog_view *);
761 static const struct got_error *search_start_ref_view(struct tog_view *);
762 static const struct got_error *search_next_ref_view(struct tog_view *);
763 
764 static const struct got_error *open_help_view(struct tog_view *,
765     struct tog_view *);
766 static const struct got_error *show_help_view(struct tog_view *);
767 static const struct got_error *input_help_view(struct tog_view **,
768     struct tog_view *, int);
769 static const struct got_error *reset_help_view(struct tog_view *);
770 static const struct got_error* close_help_view(struct tog_view *);
771 static const struct got_error *search_start_help_view(struct tog_view *);
772 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
773     size_t *, int **, int **, int **, int **);
774 
775 static volatile sig_atomic_t tog_sigwinch_received;
776 static volatile sig_atomic_t tog_sigpipe_received;
777 static volatile sig_atomic_t tog_sigcont_received;
778 static volatile sig_atomic_t tog_sigint_received;
779 static volatile sig_atomic_t tog_sigterm_received;
780 
781 static void
782 tog_sigwinch(int signo)
783 {
784 	tog_sigwinch_received = 1;
785 }
786 
787 static void
788 tog_sigpipe(int signo)
789 {
790 	tog_sigpipe_received = 1;
791 }
792 
793 static void
794 tog_sigcont(int signo)
795 {
796 	tog_sigcont_received = 1;
797 }
798 
799 static void
800 tog_sigint(int signo)
801 {
802 	tog_sigint_received = 1;
803 }
804 
805 static void
806 tog_sigterm(int signo)
807 {
808 	tog_sigterm_received = 1;
809 }
810 
811 static int
812 tog_fatal_signal_received(void)
813 {
814 	return (tog_sigpipe_received ||
815 	    tog_sigint_received || tog_sigterm_received);
816 }
817 
818 static const struct got_error *
819 view_close(struct tog_view *view)
820 {
821 	const struct got_error *err = NULL, *child_err = NULL;
822 
823 	if (view->child) {
824 		child_err = view_close(view->child);
825 		view->child = NULL;
826 	}
827 	if (view->close)
828 		err = view->close(view);
829 	if (view->panel)
830 		del_panel(view->panel);
831 	if (view->window)
832 		delwin(view->window);
833 	free(view);
834 	return err ? err : child_err;
835 }
836 
837 static struct tog_view *
838 view_open(int nlines, int ncols, int begin_y, int begin_x,
839     enum tog_view_type type)
840 {
841 	struct tog_view *view = calloc(1, sizeof(*view));
842 
843 	if (view == NULL)
844 		return NULL;
845 
846 	view->type = type;
847 	view->lines = LINES;
848 	view->cols = COLS;
849 	view->nlines = nlines ? nlines : LINES - begin_y;
850 	view->ncols = ncols ? ncols : COLS - begin_x;
851 	view->begin_y = begin_y;
852 	view->begin_x = begin_x;
853 	view->window = newwin(nlines, ncols, begin_y, begin_x);
854 	if (view->window == NULL) {
855 		view_close(view);
856 		return NULL;
857 	}
858 	view->panel = new_panel(view->window);
859 	if (view->panel == NULL ||
860 	    set_panel_userptr(view->panel, view) != OK) {
861 		view_close(view);
862 		return NULL;
863 	}
864 
865 	keypad(view->window, TRUE);
866 	return view;
867 }
868 
869 static int
870 view_split_begin_x(int begin_x)
871 {
872 	if (begin_x > 0 || COLS < 120)
873 		return 0;
874 	return (COLS - MAX(COLS / 2, 80));
875 }
876 
877 /* XXX Stub till we decide what to do. */
878 static int
879 view_split_begin_y(int lines)
880 {
881 	return lines * HSPLIT_SCALE;
882 }
883 
884 static const struct got_error *view_resize(struct tog_view *);
885 
886 static const struct got_error *
887 view_splitscreen(struct tog_view *view)
888 {
889 	const struct got_error *err = NULL;
890 
891 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
892 		if (view->resized_y && view->resized_y < view->lines)
893 			view->begin_y = view->resized_y;
894 		else
895 			view->begin_y = view_split_begin_y(view->nlines);
896 		view->begin_x = 0;
897 	} else if (!view->resized) {
898 		if (view->resized_x && view->resized_x < view->cols - 1 &&
899 		    view->cols > 119)
900 			view->begin_x = view->resized_x;
901 		else
902 			view->begin_x = view_split_begin_x(0);
903 		view->begin_y = 0;
904 	}
905 	view->nlines = LINES - view->begin_y;
906 	view->ncols = COLS - view->begin_x;
907 	view->lines = LINES;
908 	view->cols = COLS;
909 	err = view_resize(view);
910 	if (err)
911 		return err;
912 
913 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
914 		view->parent->nlines = view->begin_y;
915 
916 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
917 		return got_error_from_errno("mvwin");
918 
919 	return NULL;
920 }
921 
922 static const struct got_error *
923 view_fullscreen(struct tog_view *view)
924 {
925 	const struct got_error *err = NULL;
926 
927 	view->begin_x = 0;
928 	view->begin_y = view->resized ? view->begin_y : 0;
929 	view->nlines = view->resized ? view->nlines : LINES;
930 	view->ncols = COLS;
931 	view->lines = LINES;
932 	view->cols = COLS;
933 	err = view_resize(view);
934 	if (err)
935 		return err;
936 
937 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
938 		return got_error_from_errno("mvwin");
939 
940 	return NULL;
941 }
942 
943 static int
944 view_is_parent_view(struct tog_view *view)
945 {
946 	return view->parent == NULL;
947 }
948 
949 static int
950 view_is_splitscreen(struct tog_view *view)
951 {
952 	return view->begin_x > 0 || view->begin_y > 0;
953 }
954 
955 static int
956 view_is_fullscreen(struct tog_view *view)
957 {
958 	return view->nlines == LINES && view->ncols == COLS;
959 }
960 
961 static int
962 view_is_hsplit_top(struct tog_view *view)
963 {
964 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
965 	    view_is_splitscreen(view->child);
966 }
967 
968 static void
969 view_border(struct tog_view *view)
970 {
971 	PANEL *panel;
972 	const struct tog_view *view_above;
973 
974 	if (view->parent)
975 		return view_border(view->parent);
976 
977 	panel = panel_above(view->panel);
978 	if (panel == NULL)
979 		return;
980 
981 	view_above = panel_userptr(panel);
982 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
983 		mvwhline(view->window, view_above->begin_y - 1,
984 		    view->begin_x, got_locale_is_utf8() ?
985 		    ACS_HLINE : '-', view->ncols);
986 	else
987 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
988 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
989 }
990 
991 static const struct got_error *view_init_hsplit(struct tog_view *, int);
992 static const struct got_error *request_log_commits(struct tog_view *);
993 static const struct got_error *offset_selection_down(struct tog_view *);
994 static void offset_selection_up(struct tog_view *);
995 static void view_get_split(struct tog_view *, int *, int *);
996 
997 static const struct got_error *
998 view_resize(struct tog_view *view)
999 {
1000 	const struct got_error	*err = NULL;
1001 	int			 dif, nlines, ncols;
1002 
1003 	dif = LINES - view->lines;  /* line difference */
1004 
1005 	if (view->lines > LINES)
1006 		nlines = view->nlines - (view->lines - LINES);
1007 	else
1008 		nlines = view->nlines + (LINES - view->lines);
1009 	if (view->cols > COLS)
1010 		ncols = view->ncols - (view->cols - COLS);
1011 	else
1012 		ncols = view->ncols + (COLS - view->cols);
1013 
1014 	if (view->child) {
1015 		int hs = view->child->begin_y;
1016 
1017 		if (!view_is_fullscreen(view))
1018 			view->child->begin_x = view_split_begin_x(view->begin_x);
1019 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1020 		    view->child->begin_x == 0) {
1021 			ncols = COLS;
1022 
1023 			view_fullscreen(view->child);
1024 			if (view->child->focussed)
1025 				show_panel(view->child->panel);
1026 			else
1027 				show_panel(view->panel);
1028 		} else {
1029 			ncols = view->child->begin_x;
1030 
1031 			view_splitscreen(view->child);
1032 			show_panel(view->child->panel);
1033 		}
1034 		/*
1035 		 * XXX This is ugly and needs to be moved into the above
1036 		 * logic but "works" for now and my attempts at moving it
1037 		 * break either 'tab' or 'F' key maps in horizontal splits.
1038 		 */
1039 		if (hs) {
1040 			err = view_splitscreen(view->child);
1041 			if (err)
1042 				return err;
1043 			if (dif < 0) { /* top split decreased */
1044 				err = offset_selection_down(view);
1045 				if (err)
1046 					return err;
1047 			}
1048 			view_border(view);
1049 			update_panels();
1050 			doupdate();
1051 			show_panel(view->child->panel);
1052 			nlines = view->nlines;
1053 		}
1054 	} else if (view->parent == NULL)
1055 		ncols = COLS;
1056 
1057 	if (view->resize && dif > 0) {
1058 		err = view->resize(view, dif);
1059 		if (err)
1060 			return err;
1061 	}
1062 
1063 	if (wresize(view->window, nlines, ncols) == ERR)
1064 		return got_error_from_errno("wresize");
1065 	if (replace_panel(view->panel, view->window) == ERR)
1066 		return got_error_from_errno("replace_panel");
1067 	wclear(view->window);
1068 
1069 	view->nlines = nlines;
1070 	view->ncols = ncols;
1071 	view->lines = LINES;
1072 	view->cols = COLS;
1073 
1074 	return NULL;
1075 }
1076 
1077 static const struct got_error *
1078 resize_log_view(struct tog_view *view, int increase)
1079 {
1080 	struct tog_log_view_state	*s = &view->state.log;
1081 	const struct got_error		*err = NULL;
1082 	int				 n = 0;
1083 
1084 	if (s->selected_entry)
1085 		n = s->selected_entry->idx + view->lines - s->selected;
1086 
1087 	/*
1088 	 * Request commits to account for the increased
1089 	 * height so we have enough to populate the view.
1090 	 */
1091 	if (s->commits->ncommits < n) {
1092 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1093 		err = request_log_commits(view);
1094 	}
1095 
1096 	return err;
1097 }
1098 
1099 static void
1100 view_adjust_offset(struct tog_view *view, int n)
1101 {
1102 	if (n == 0)
1103 		return;
1104 
1105 	if (view->parent && view->parent->offset) {
1106 		if (view->parent->offset + n >= 0)
1107 			view->parent->offset += n;
1108 		else
1109 			view->parent->offset = 0;
1110 	} else if (view->offset) {
1111 		if (view->offset - n >= 0)
1112 			view->offset -= n;
1113 		else
1114 			view->offset = 0;
1115 	}
1116 }
1117 
1118 static const struct got_error *
1119 view_resize_split(struct tog_view *view, int resize)
1120 {
1121 	const struct got_error	*err = NULL;
1122 	struct tog_view		*v = NULL;
1123 
1124 	if (view->parent)
1125 		v = view->parent;
1126 	else
1127 		v = view;
1128 
1129 	if (!v->child || !view_is_splitscreen(v->child))
1130 		return NULL;
1131 
1132 	v->resized = v->child->resized = resize;  /* lock for resize event */
1133 
1134 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1135 		if (v->child->resized_y)
1136 			v->child->begin_y = v->child->resized_y;
1137 		if (view->parent)
1138 			v->child->begin_y -= resize;
1139 		else
1140 			v->child->begin_y += resize;
1141 		if (v->child->begin_y < 3) {
1142 			view->count = 0;
1143 			v->child->begin_y = 3;
1144 		} else if (v->child->begin_y > LINES - 1) {
1145 			view->count = 0;
1146 			v->child->begin_y = LINES - 1;
1147 		}
1148 		v->ncols = COLS;
1149 		v->child->ncols = COLS;
1150 		view_adjust_offset(view, resize);
1151 		err = view_init_hsplit(v, v->child->begin_y);
1152 		if (err)
1153 			return err;
1154 		v->child->resized_y = v->child->begin_y;
1155 	} else {
1156 		if (v->child->resized_x)
1157 			v->child->begin_x = v->child->resized_x;
1158 		if (view->parent)
1159 			v->child->begin_x -= resize;
1160 		else
1161 			v->child->begin_x += resize;
1162 		if (v->child->begin_x < 11) {
1163 			view->count = 0;
1164 			v->child->begin_x = 11;
1165 		} else if (v->child->begin_x > COLS - 1) {
1166 			view->count = 0;
1167 			v->child->begin_x = COLS - 1;
1168 		}
1169 		v->child->resized_x = v->child->begin_x;
1170 	}
1171 
1172 	v->child->mode = v->mode;
1173 	v->child->nlines = v->lines - v->child->begin_y;
1174 	v->child->ncols = v->cols - v->child->begin_x;
1175 	v->focus_child = 1;
1176 
1177 	err = view_fullscreen(v);
1178 	if (err)
1179 		return err;
1180 	err = view_splitscreen(v->child);
1181 	if (err)
1182 		return err;
1183 
1184 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1185 		err = offset_selection_down(v->child);
1186 		if (err)
1187 			return err;
1188 	}
1189 
1190 	if (v->resize)
1191 		err = v->resize(v, 0);
1192 	else if (v->child->resize)
1193 		err = v->child->resize(v->child, 0);
1194 
1195 	v->resized = v->child->resized = 0;
1196 
1197 	return err;
1198 }
1199 
1200 static void
1201 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1202 {
1203 	struct tog_view *v = src->child ? src->child : src;
1204 
1205 	dst->resized_x = v->resized_x;
1206 	dst->resized_y = v->resized_y;
1207 }
1208 
1209 static const struct got_error *
1210 view_close_child(struct tog_view *view)
1211 {
1212 	const struct got_error *err = NULL;
1213 
1214 	if (view->child == NULL)
1215 		return NULL;
1216 
1217 	err = view_close(view->child);
1218 	view->child = NULL;
1219 	return err;
1220 }
1221 
1222 static const struct got_error *
1223 view_set_child(struct tog_view *view, struct tog_view *child)
1224 {
1225 	const struct got_error *err = NULL;
1226 
1227 	view->child = child;
1228 	child->parent = view;
1229 
1230 	err = view_resize(view);
1231 	if (err)
1232 		return err;
1233 
1234 	if (view->child->resized_x || view->child->resized_y)
1235 		err = view_resize_split(view, 0);
1236 
1237 	return err;
1238 }
1239 
1240 static const struct got_error *view_dispatch_request(struct tog_view **,
1241     struct tog_view *, enum tog_view_type, int, int);
1242 
1243 static const struct got_error *
1244 view_request_new(struct tog_view **requested, struct tog_view *view,
1245     enum tog_view_type request)
1246 {
1247 	struct tog_view		*new_view = NULL;
1248 	const struct got_error	*err;
1249 	int			 y = 0, x = 0;
1250 
1251 	*requested = NULL;
1252 
1253 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1254 		view_get_split(view, &y, &x);
1255 
1256 	err = view_dispatch_request(&new_view, view, request, y, x);
1257 	if (err)
1258 		return err;
1259 
1260 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1261 	    request != TOG_VIEW_HELP) {
1262 		err = view_init_hsplit(view, y);
1263 		if (err)
1264 			return err;
1265 	}
1266 
1267 	view->focussed = 0;
1268 	new_view->focussed = 1;
1269 	new_view->mode = view->mode;
1270 	new_view->nlines = request == TOG_VIEW_HELP ?
1271 	    view->lines : view->lines - y;
1272 
1273 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1274 		view_transfer_size(new_view, view);
1275 		err = view_close_child(view);
1276 		if (err)
1277 			return err;
1278 		err = view_set_child(view, new_view);
1279 		if (err)
1280 			return err;
1281 		view->focus_child = 1;
1282 	} else
1283 		*requested = new_view;
1284 
1285 	return NULL;
1286 }
1287 
1288 static void
1289 tog_resizeterm(void)
1290 {
1291 	int cols, lines;
1292 	struct winsize size;
1293 
1294 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1295 		cols = 80;     /* Default */
1296 		lines = 24;
1297 	} else {
1298 		cols = size.ws_col;
1299 		lines = size.ws_row;
1300 	}
1301 	resize_term(lines, cols);
1302 }
1303 
1304 static const struct got_error *
1305 view_search_start(struct tog_view *view, int fast_refresh)
1306 {
1307 	const struct got_error *err = NULL;
1308 	struct tog_view *v = view;
1309 	char pattern[1024];
1310 	int ret;
1311 
1312 	if (view->search_started) {
1313 		regfree(&view->regex);
1314 		view->searching = 0;
1315 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1316 	}
1317 	view->search_started = 0;
1318 
1319 	if (view->nlines < 1)
1320 		return NULL;
1321 
1322 	if (view_is_hsplit_top(view))
1323 		v = view->child;
1324 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1325 		v = view->parent;
1326 
1327 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1328 	wclrtoeol(v->window);
1329 
1330 	nodelay(v->window, FALSE);  /* block for search term input */
1331 	nocbreak();
1332 	echo();
1333 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1334 	wrefresh(v->window);
1335 	cbreak();
1336 	noecho();
1337 	nodelay(v->window, TRUE);
1338 	if (!fast_refresh && !using_mock_io)
1339 		halfdelay(10);
1340 	if (ret == ERR)
1341 		return NULL;
1342 
1343 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1344 		err = view->search_start(view);
1345 		if (err) {
1346 			regfree(&view->regex);
1347 			return err;
1348 		}
1349 		view->search_started = 1;
1350 		view->searching = TOG_SEARCH_FORWARD;
1351 		view->search_next_done = 0;
1352 		view->search_next(view);
1353 	}
1354 
1355 	return NULL;
1356 }
1357 
1358 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1359 static const struct got_error *
1360 switch_split(struct tog_view *view)
1361 {
1362 	const struct got_error	*err = NULL;
1363 	struct tog_view		*v = NULL;
1364 
1365 	if (view->parent)
1366 		v = view->parent;
1367 	else
1368 		v = view;
1369 
1370 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1371 		v->mode = TOG_VIEW_SPLIT_VERT;
1372 	else
1373 		v->mode = TOG_VIEW_SPLIT_HRZN;
1374 
1375 	if (!v->child)
1376 		return NULL;
1377 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1378 		v->mode = TOG_VIEW_SPLIT_NONE;
1379 
1380 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1381 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1382 		v->child->begin_y = v->child->resized_y;
1383 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1384 		v->child->begin_x = v->child->resized_x;
1385 
1386 
1387 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1388 		v->ncols = COLS;
1389 		v->child->ncols = COLS;
1390 		v->child->nscrolled = LINES - v->child->nlines;
1391 
1392 		err = view_init_hsplit(v, v->child->begin_y);
1393 		if (err)
1394 			return err;
1395 	}
1396 	v->child->mode = v->mode;
1397 	v->child->nlines = v->lines - v->child->begin_y;
1398 	v->focus_child = 1;
1399 
1400 	err = view_fullscreen(v);
1401 	if (err)
1402 		return err;
1403 	err = view_splitscreen(v->child);
1404 	if (err)
1405 		return err;
1406 
1407 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1408 		v->mode = TOG_VIEW_SPLIT_VERT;
1409 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1410 		err = offset_selection_down(v);
1411 		if (err)
1412 			return err;
1413 		err = offset_selection_down(v->child);
1414 		if (err)
1415 			return err;
1416 	} else {
1417 		offset_selection_up(v);
1418 		offset_selection_up(v->child);
1419 	}
1420 	if (v->resize)
1421 		err = v->resize(v, 0);
1422 	else if (v->child->resize)
1423 		err = v->child->resize(v->child, 0);
1424 
1425 	return err;
1426 }
1427 
1428 /*
1429  * Strip trailing whitespace from str starting at byte *n;
1430  * if *n < 0, use strlen(str). Return new str length in *n.
1431  */
1432 static void
1433 strip_trailing_ws(char *str, int *n)
1434 {
1435 	size_t x = *n;
1436 
1437 	if (str == NULL || *str == '\0')
1438 		return;
1439 
1440 	if (x < 0)
1441 		x = strlen(str);
1442 
1443 	while (x-- > 0 && isspace((unsigned char)str[x]))
1444 		str[x] = '\0';
1445 
1446 	*n = x + 1;
1447 }
1448 
1449 /*
1450  * Extract visible substring of line y from the curses screen
1451  * and strip trailing whitespace. If vline is set and locale is
1452  * UTF-8, overwrite line[vline] with '|' because the ACS_VLINE
1453  * character is written out as 'x'. Write the line to file f.
1454  */
1455 static const struct got_error *
1456 view_write_line(FILE *f, int y, int vline)
1457 {
1458 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1459 	int	r, w;
1460 
1461 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1462 	if (r == ERR)
1463 		return got_error_fmt(GOT_ERR_RANGE,
1464 		    "failed to extract line %d", y);
1465 
1466 	/*
1467 	 * In some views, lines are padded with blanks to COLS width.
1468 	 * Strip them so we can diff without the -b flag when testing.
1469 	 */
1470 	strip_trailing_ws(line, &r);
1471 
1472 	if (vline > 0 && got_locale_is_utf8())
1473 		line[vline] = '|';
1474 
1475 	w = fprintf(f, "%s\n", line);
1476 	if (w != r + 1)		/* \n */
1477 		return got_ferror(f, GOT_ERR_IO);
1478 
1479 	return NULL;
1480 }
1481 
1482 /*
1483  * Capture the visible curses screen by writing each line to the
1484  * file at the path set via the TOG_SCR_DUMP environment variable.
1485  */
1486 static const struct got_error *
1487 screendump(struct tog_view *view)
1488 {
1489 	const struct got_error	*err;
1490 	FILE			*f = NULL;
1491 	const char		*path;
1492 	int			 i;
1493 
1494 	path = getenv("TOG_SCR_DUMP");
1495 	if (path == NULL || *path == '\0')
1496 		return got_error_msg(GOT_ERR_BAD_PATH,
1497 		    "TOG_SCR_DUMP path not set to capture screen dump");
1498 	f = fopen(path, "wex");
1499 	if (f == NULL)
1500 		return got_error_from_errno_fmt("fopen: %s", path);
1501 
1502 	if ((view->child && view->child->begin_x) ||
1503 	    (view->parent && view->begin_x)) {
1504 		int ncols = view->child ? view->ncols : view->parent->ncols;
1505 
1506 		/* vertical splitscreen */
1507 		for (i = 0; i < view->nlines; ++i) {
1508 			err = view_write_line(f, i, ncols - 1);
1509 			if (err)
1510 				goto done;
1511 		}
1512 	} else {
1513 		int hline = 0;
1514 
1515 		/* fullscreen or horizontal splitscreen */
1516 		if ((view->child && view->child->begin_y) ||
1517 		    (view->parent && view->begin_y))	/* hsplit */
1518 			hline = view->child ?
1519 			    view->child->begin_y : view->begin_y;
1520 
1521 		for (i = 0; i < view->lines; i++) {
1522 			if (hline && got_locale_is_utf8() && i == hline - 1) {
1523 				int c;
1524 
1525 				/* ACS_HLINE writes out as 'q', overwrite it */
1526 				for (c = 0; c < view->cols; ++c)
1527 					fputc('-', f);
1528 				fputc('\n', f);
1529 				continue;
1530 			}
1531 
1532 			err = view_write_line(f, i, 0);
1533 			if (err)
1534 				goto done;
1535 		}
1536 	}
1537 
1538 done:
1539 	if (f && fclose(f) == EOF && err == NULL)
1540 		err = got_ferror(f, GOT_ERR_IO);
1541 	return err;
1542 }
1543 
1544 /*
1545  * Compute view->count from numeric input. Assign total to view->count and
1546  * return first non-numeric key entered.
1547  */
1548 static int
1549 get_compound_key(struct tog_view *view, int c)
1550 {
1551 	struct tog_view	*v = view;
1552 	int		 x, n = 0;
1553 
1554 	if (view_is_hsplit_top(view))
1555 		v = view->child;
1556 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1557 		v = view->parent;
1558 
1559 	view->count = 0;
1560 	cbreak();  /* block for input */
1561 	nodelay(view->window, FALSE);
1562 	wmove(v->window, v->nlines - 1, 0);
1563 	wclrtoeol(v->window);
1564 	waddch(v->window, ':');
1565 
1566 	do {
1567 		x = getcurx(v->window);
1568 		if (x != ERR && x < view->ncols) {
1569 			waddch(v->window, c);
1570 			wrefresh(v->window);
1571 		}
1572 
1573 		/*
1574 		 * Don't overflow. Max valid request should be the greatest
1575 		 * between the longest and total lines; cap at 10 million.
1576 		 */
1577 		if (n >= 9999999)
1578 			n = 9999999;
1579 		else
1580 			n = n * 10 + (c - '0');
1581 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1582 
1583 	if (c == 'G' || c == 'g') {	/* nG key map */
1584 		view->gline = view->hiline = n;
1585 		n = 0;
1586 		c = 0;
1587 	}
1588 
1589 	/* Massage excessive or inapplicable values at the input handler. */
1590 	view->count = n;
1591 
1592 	return c;
1593 }
1594 
1595 static void
1596 action_report(struct tog_view *view)
1597 {
1598 	struct tog_view *v = view;
1599 
1600 	if (view_is_hsplit_top(view))
1601 		v = view->child;
1602 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1603 		v = view->parent;
1604 
1605 	wmove(v->window, v->nlines - 1, 0);
1606 	wclrtoeol(v->window);
1607 	wprintw(v->window, ":%s", view->action);
1608 	wrefresh(v->window);
1609 
1610 	/*
1611 	 * Clear action status report. Only clear in blame view
1612 	 * once annotating is complete, otherwise it's too fast.
1613 	 */
1614 	if (view->type == TOG_VIEW_BLAME) {
1615 		if (view->state.blame.blame_complete)
1616 			view->action = NULL;
1617 	} else
1618 		view->action = NULL;
1619 }
1620 
1621 /*
1622  * Read the next line from the test script and assign
1623  * key instruction to *ch. If at EOF, set the *done flag.
1624  */
1625 static const struct got_error *
1626 tog_read_script_key(FILE *script, int *ch, int *done)
1627 {
1628 	const struct got_error	*err = NULL;
1629 	char			*line = NULL;
1630 	size_t			 linesz = 0;
1631 
1632 	if (getline(&line, &linesz, script) == -1) {
1633 		if (feof(script)) {
1634 			*done = 1;
1635 			goto done;
1636 		} else {
1637 			err = got_ferror(script, GOT_ERR_IO);
1638 			goto done;
1639 		}
1640 	} else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1641 		*ch = KEY_ENTER;
1642 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1643 		*ch = KEY_RIGHT;
1644 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1645 		*ch = KEY_LEFT;
1646 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1647 		*ch = KEY_DOWN;
1648 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1649 		*ch = KEY_UP;
1650 	else if (strncasecmp(line, TOG_SCREEN_DUMP, TOG_SCREEN_DUMP_LEN) == 0)
1651 		*ch = TOG_KEY_SCRDUMP;
1652 	else
1653 		*ch = *line;
1654 
1655 done:
1656 	free(line);
1657 	return err;
1658 }
1659 
1660 static const struct got_error *
1661 view_input(struct tog_view **new, int *done, struct tog_view *view,
1662     struct tog_view_list_head *views, int fast_refresh)
1663 {
1664 	const struct got_error *err = NULL;
1665 	struct tog_view *v;
1666 	int ch, errcode;
1667 
1668 	*new = NULL;
1669 
1670 	if (view->action)
1671 		action_report(view);
1672 
1673 	/* Clear "no matches" indicator. */
1674 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1675 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1676 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1677 		view->count = 0;
1678 	}
1679 
1680 	if (view->searching && !view->search_next_done) {
1681 		errcode = pthread_mutex_unlock(&tog_mutex);
1682 		if (errcode)
1683 			return got_error_set_errno(errcode,
1684 			    "pthread_mutex_unlock");
1685 		sched_yield();
1686 		errcode = pthread_mutex_lock(&tog_mutex);
1687 		if (errcode)
1688 			return got_error_set_errno(errcode,
1689 			    "pthread_mutex_lock");
1690 		view->search_next(view);
1691 		return NULL;
1692 	}
1693 
1694 	/* Allow threads to make progress while we are waiting for input. */
1695 	errcode = pthread_mutex_unlock(&tog_mutex);
1696 	if (errcode)
1697 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1698 
1699 	if (using_mock_io) {
1700 		err = tog_read_script_key(tog_io.f, &ch, done);
1701 		if (err)
1702 			return err;
1703 	} else if (view->count && --view->count) {
1704 		cbreak();
1705 		nodelay(view->window, TRUE);
1706 		ch = wgetch(view->window);
1707 		/* let C-g or backspace abort unfinished count */
1708 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1709 			view->count = 0;
1710 		else
1711 			ch = view->ch;
1712 	} else {
1713 		ch = wgetch(view->window);
1714 		if (ch >= '1' && ch  <= '9')
1715 			view->ch = ch = get_compound_key(view, ch);
1716 	}
1717 	if (view->hiline && ch != ERR && ch != 0)
1718 		view->hiline = 0;  /* key pressed, clear line highlight */
1719 	nodelay(view->window, TRUE);
1720 	errcode = pthread_mutex_lock(&tog_mutex);
1721 	if (errcode)
1722 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1723 
1724 	if (tog_sigwinch_received || tog_sigcont_received) {
1725 		tog_resizeterm();
1726 		tog_sigwinch_received = 0;
1727 		tog_sigcont_received = 0;
1728 		TAILQ_FOREACH(v, views, entry) {
1729 			err = view_resize(v);
1730 			if (err)
1731 				return err;
1732 			err = v->input(new, v, KEY_RESIZE);
1733 			if (err)
1734 				return err;
1735 			if (v->child) {
1736 				err = view_resize(v->child);
1737 				if (err)
1738 					return err;
1739 				err = v->child->input(new, v->child,
1740 				    KEY_RESIZE);
1741 				if (err)
1742 					return err;
1743 				if (v->child->resized_x || v->child->resized_y) {
1744 					err = view_resize_split(v, 0);
1745 					if (err)
1746 						return err;
1747 				}
1748 			}
1749 		}
1750 	}
1751 
1752 	switch (ch) {
1753 	case '?':
1754 	case 'H':
1755 	case KEY_F(1):
1756 		if (view->type == TOG_VIEW_HELP)
1757 			err = view->reset(view);
1758 		else
1759 			err = view_request_new(new, view, TOG_VIEW_HELP);
1760 		break;
1761 	case '\t':
1762 		view->count = 0;
1763 		if (view->child) {
1764 			view->focussed = 0;
1765 			view->child->focussed = 1;
1766 			view->focus_child = 1;
1767 		} else if (view->parent) {
1768 			view->focussed = 0;
1769 			view->parent->focussed = 1;
1770 			view->parent->focus_child = 0;
1771 			if (!view_is_splitscreen(view)) {
1772 				if (view->parent->resize) {
1773 					err = view->parent->resize(view->parent,
1774 					    0);
1775 					if (err)
1776 						return err;
1777 				}
1778 				offset_selection_up(view->parent);
1779 				err = view_fullscreen(view->parent);
1780 				if (err)
1781 					return err;
1782 			}
1783 		}
1784 		break;
1785 	case 'q':
1786 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1787 			if (view->parent->resize) {
1788 				/* might need more commits to fill fullscreen */
1789 				err = view->parent->resize(view->parent, 0);
1790 				if (err)
1791 					break;
1792 			}
1793 			offset_selection_up(view->parent);
1794 		}
1795 		err = view->input(new, view, ch);
1796 		view->dying = 1;
1797 		break;
1798 	case 'Q':
1799 		*done = 1;
1800 		break;
1801 	case 'F':
1802 		view->count = 0;
1803 		if (view_is_parent_view(view)) {
1804 			if (view->child == NULL)
1805 				break;
1806 			if (view_is_splitscreen(view->child)) {
1807 				view->focussed = 0;
1808 				view->child->focussed = 1;
1809 				err = view_fullscreen(view->child);
1810 			} else {
1811 				err = view_splitscreen(view->child);
1812 				if (!err)
1813 					err = view_resize_split(view, 0);
1814 			}
1815 			if (err)
1816 				break;
1817 			err = view->child->input(new, view->child,
1818 			    KEY_RESIZE);
1819 		} else {
1820 			if (view_is_splitscreen(view)) {
1821 				view->parent->focussed = 0;
1822 				view->focussed = 1;
1823 				err = view_fullscreen(view);
1824 			} else {
1825 				err = view_splitscreen(view);
1826 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1827 					err = view_resize(view->parent);
1828 				if (!err)
1829 					err = view_resize_split(view, 0);
1830 			}
1831 			if (err)
1832 				break;
1833 			err = view->input(new, view, KEY_RESIZE);
1834 		}
1835 		if (err)
1836 			break;
1837 		if (view->resize) {
1838 			err = view->resize(view, 0);
1839 			if (err)
1840 				break;
1841 		}
1842 		if (view->parent)
1843 			err = offset_selection_down(view->parent);
1844 		if (!err)
1845 			err = offset_selection_down(view);
1846 		break;
1847 	case 'S':
1848 		view->count = 0;
1849 		err = switch_split(view);
1850 		break;
1851 	case '-':
1852 		err = view_resize_split(view, -1);
1853 		break;
1854 	case '+':
1855 		err = view_resize_split(view, 1);
1856 		break;
1857 	case KEY_RESIZE:
1858 		break;
1859 	case '/':
1860 		view->count = 0;
1861 		if (view->search_start)
1862 			view_search_start(view, fast_refresh);
1863 		else
1864 			err = view->input(new, view, ch);
1865 		break;
1866 	case 'N':
1867 	case 'n':
1868 		if (view->search_started && view->search_next) {
1869 			view->searching = (ch == 'n' ?
1870 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1871 			view->search_next_done = 0;
1872 			view->search_next(view);
1873 		} else
1874 			err = view->input(new, view, ch);
1875 		break;
1876 	case 'A':
1877 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1878 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1879 			view->action = "Patience diff algorithm";
1880 		} else {
1881 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1882 			view->action = "Myers diff algorithm";
1883 		}
1884 		TAILQ_FOREACH(v, views, entry) {
1885 			if (v->reset) {
1886 				err = v->reset(v);
1887 				if (err)
1888 					return err;
1889 			}
1890 			if (v->child && v->child->reset) {
1891 				err = v->child->reset(v->child);
1892 				if (err)
1893 					return err;
1894 			}
1895 		}
1896 		break;
1897 	case TOG_KEY_SCRDUMP:
1898 		err = screendump(view);
1899 		break;
1900 	default:
1901 		err = view->input(new, view, ch);
1902 		break;
1903 	}
1904 
1905 	return err;
1906 }
1907 
1908 static int
1909 view_needs_focus_indication(struct tog_view *view)
1910 {
1911 	if (view_is_parent_view(view)) {
1912 		if (view->child == NULL || view->child->focussed)
1913 			return 0;
1914 		if (!view_is_splitscreen(view->child))
1915 			return 0;
1916 	} else if (!view_is_splitscreen(view))
1917 		return 0;
1918 
1919 	return view->focussed;
1920 }
1921 
1922 static const struct got_error *
1923 tog_io_close(void)
1924 {
1925 	const struct got_error *err = NULL;
1926 
1927 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1928 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1929 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1930 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1931 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1932 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1933 
1934 	return err;
1935 }
1936 
1937 static const struct got_error *
1938 view_loop(struct tog_view *view)
1939 {
1940 	const struct got_error *err = NULL;
1941 	struct tog_view_list_head views;
1942 	struct tog_view *new_view;
1943 	char *mode;
1944 	int fast_refresh = 10;
1945 	int done = 0, errcode;
1946 
1947 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1948 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1949 		view->mode = TOG_VIEW_SPLIT_VERT;
1950 	else
1951 		view->mode = TOG_VIEW_SPLIT_HRZN;
1952 
1953 	errcode = pthread_mutex_lock(&tog_mutex);
1954 	if (errcode)
1955 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1956 
1957 	TAILQ_INIT(&views);
1958 	TAILQ_INSERT_HEAD(&views, view, entry);
1959 
1960 	view->focussed = 1;
1961 	err = view->show(view);
1962 	if (err)
1963 		return err;
1964 	update_panels();
1965 	doupdate();
1966 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1967 	    !tog_fatal_signal_received()) {
1968 		/* Refresh fast during initialization, then become slower. */
1969 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1970 			halfdelay(10); /* switch to once per second */
1971 
1972 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1973 		if (err)
1974 			break;
1975 
1976 		if (view->dying && view == TAILQ_FIRST(&views) &&
1977 		    TAILQ_NEXT(view, entry) == NULL)
1978 			done = 1;
1979 		if (done) {
1980 			struct tog_view *v;
1981 
1982 			/*
1983 			 * When we quit, scroll the screen up a single line
1984 			 * so we don't lose any information.
1985 			 */
1986 			TAILQ_FOREACH(v, &views, entry) {
1987 				wmove(v->window, 0, 0);
1988 				wdeleteln(v->window);
1989 				wnoutrefresh(v->window);
1990 				if (v->child && !view_is_fullscreen(v)) {
1991 					wmove(v->child->window, 0, 0);
1992 					wdeleteln(v->child->window);
1993 					wnoutrefresh(v->child->window);
1994 				}
1995 			}
1996 			doupdate();
1997 		}
1998 
1999 		if (view->dying) {
2000 			struct tog_view *v, *prev = NULL;
2001 
2002 			if (view_is_parent_view(view))
2003 				prev = TAILQ_PREV(view, tog_view_list_head,
2004 				    entry);
2005 			else if (view->parent)
2006 				prev = view->parent;
2007 
2008 			if (view->parent) {
2009 				view->parent->child = NULL;
2010 				view->parent->focus_child = 0;
2011 				/* Restore fullscreen line height. */
2012 				view->parent->nlines = view->parent->lines;
2013 				err = view_resize(view->parent);
2014 				if (err)
2015 					break;
2016 				/* Make resized splits persist. */
2017 				view_transfer_size(view->parent, view);
2018 			} else
2019 				TAILQ_REMOVE(&views, view, entry);
2020 
2021 			err = view_close(view);
2022 			if (err)
2023 				goto done;
2024 
2025 			view = NULL;
2026 			TAILQ_FOREACH(v, &views, entry) {
2027 				if (v->focussed)
2028 					break;
2029 			}
2030 			if (view == NULL && new_view == NULL) {
2031 				/* No view has focus. Try to pick one. */
2032 				if (prev)
2033 					view = prev;
2034 				else if (!TAILQ_EMPTY(&views)) {
2035 					view = TAILQ_LAST(&views,
2036 					    tog_view_list_head);
2037 				}
2038 				if (view) {
2039 					if (view->focus_child) {
2040 						view->child->focussed = 1;
2041 						view = view->child;
2042 					} else
2043 						view->focussed = 1;
2044 				}
2045 			}
2046 		}
2047 		if (new_view) {
2048 			struct tog_view *v, *t;
2049 			/* Only allow one parent view per type. */
2050 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2051 				if (v->type != new_view->type)
2052 					continue;
2053 				TAILQ_REMOVE(&views, v, entry);
2054 				err = view_close(v);
2055 				if (err)
2056 					goto done;
2057 				break;
2058 			}
2059 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2060 			view = new_view;
2061 		}
2062 		if (view && !done) {
2063 			if (view_is_parent_view(view)) {
2064 				if (view->child && view->child->focussed)
2065 					view = view->child;
2066 			} else {
2067 				if (view->parent && view->parent->focussed)
2068 					view = view->parent;
2069 			}
2070 			show_panel(view->panel);
2071 			if (view->child && view_is_splitscreen(view->child))
2072 				show_panel(view->child->panel);
2073 			if (view->parent && view_is_splitscreen(view)) {
2074 				err = view->parent->show(view->parent);
2075 				if (err)
2076 					goto done;
2077 			}
2078 			err = view->show(view);
2079 			if (err)
2080 				goto done;
2081 			if (view->child) {
2082 				err = view->child->show(view->child);
2083 				if (err)
2084 					goto done;
2085 			}
2086 			update_panels();
2087 			doupdate();
2088 		}
2089 	}
2090 done:
2091 	while (!TAILQ_EMPTY(&views)) {
2092 		const struct got_error *close_err;
2093 		view = TAILQ_FIRST(&views);
2094 		TAILQ_REMOVE(&views, view, entry);
2095 		close_err = view_close(view);
2096 		if (close_err && err == NULL)
2097 			err = close_err;
2098 	}
2099 
2100 	errcode = pthread_mutex_unlock(&tog_mutex);
2101 	if (errcode && err == NULL)
2102 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2103 
2104 	return err;
2105 }
2106 
2107 __dead static void
2108 usage_log(void)
2109 {
2110 	endwin();
2111 	fprintf(stderr,
2112 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2113 	    getprogname());
2114 	exit(1);
2115 }
2116 
2117 /* Create newly allocated wide-character string equivalent to a byte string. */
2118 static const struct got_error *
2119 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2120 {
2121 	char *vis = NULL;
2122 	const struct got_error *err = NULL;
2123 
2124 	*ws = NULL;
2125 	*wlen = mbstowcs(NULL, s, 0);
2126 	if (*wlen == (size_t)-1) {
2127 		int vislen;
2128 		if (errno != EILSEQ)
2129 			return got_error_from_errno("mbstowcs");
2130 
2131 		/* byte string invalid in current encoding; try to "fix" it */
2132 		err = got_mbsavis(&vis, &vislen, s);
2133 		if (err)
2134 			return err;
2135 		*wlen = mbstowcs(NULL, vis, 0);
2136 		if (*wlen == (size_t)-1) {
2137 			err = got_error_from_errno("mbstowcs"); /* give up */
2138 			goto done;
2139 		}
2140 	}
2141 
2142 	*ws = calloc(*wlen + 1, sizeof(**ws));
2143 	if (*ws == NULL) {
2144 		err = got_error_from_errno("calloc");
2145 		goto done;
2146 	}
2147 
2148 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2149 		err = got_error_from_errno("mbstowcs");
2150 done:
2151 	free(vis);
2152 	if (err) {
2153 		free(*ws);
2154 		*ws = NULL;
2155 		*wlen = 0;
2156 	}
2157 	return err;
2158 }
2159 
2160 static const struct got_error *
2161 expand_tab(char **ptr, const char *src)
2162 {
2163 	char	*dst;
2164 	size_t	 len, n, idx = 0, sz = 0;
2165 
2166 	*ptr = NULL;
2167 	n = len = strlen(src);
2168 	dst = malloc(n + 1);
2169 	if (dst == NULL)
2170 		return got_error_from_errno("malloc");
2171 
2172 	while (idx < len && src[idx]) {
2173 		const char c = src[idx];
2174 
2175 		if (c == '\t') {
2176 			size_t nb = TABSIZE - sz % TABSIZE;
2177 			char *p;
2178 
2179 			p = realloc(dst, n + nb);
2180 			if (p == NULL) {
2181 				free(dst);
2182 				return got_error_from_errno("realloc");
2183 
2184 			}
2185 			dst = p;
2186 			n += nb;
2187 			memset(dst + sz, ' ', nb);
2188 			sz += nb;
2189 		} else
2190 			dst[sz++] = src[idx];
2191 		++idx;
2192 	}
2193 
2194 	dst[sz] = '\0';
2195 	*ptr = dst;
2196 	return NULL;
2197 }
2198 
2199 /*
2200  * Advance at most n columns from wline starting at offset off.
2201  * Return the index to the first character after the span operation.
2202  * Return the combined column width of all spanned wide character in
2203  * *rcol.
2204  */
2205 static int
2206 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2207 {
2208 	int width, i, cols = 0;
2209 
2210 	if (n == 0) {
2211 		*rcol = cols;
2212 		return off;
2213 	}
2214 
2215 	for (i = off; wline[i] != L'\0'; ++i) {
2216 		if (wline[i] == L'\t')
2217 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2218 		else
2219 			width = wcwidth(wline[i]);
2220 
2221 		if (width == -1) {
2222 			width = 1;
2223 			wline[i] = L'.';
2224 		}
2225 
2226 		if (cols + width > n)
2227 			break;
2228 		cols += width;
2229 	}
2230 
2231 	*rcol = cols;
2232 	return i;
2233 }
2234 
2235 /*
2236  * Format a line for display, ensuring that it won't overflow a width limit.
2237  * With scrolling, the width returned refers to the scrolled version of the
2238  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2239  */
2240 static const struct got_error *
2241 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2242     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2243 {
2244 	const struct got_error *err = NULL;
2245 	int cols;
2246 	wchar_t *wline = NULL;
2247 	char *exstr = NULL;
2248 	size_t wlen;
2249 	int i, scrollx;
2250 
2251 	*wlinep = NULL;
2252 	*widthp = 0;
2253 
2254 	if (expand) {
2255 		err = expand_tab(&exstr, line);
2256 		if (err)
2257 			return err;
2258 	}
2259 
2260 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2261 	free(exstr);
2262 	if (err)
2263 		return err;
2264 
2265 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2266 
2267 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2268 		wline[wlen - 1] = L'\0';
2269 		wlen--;
2270 	}
2271 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2272 		wline[wlen - 1] = L'\0';
2273 		wlen--;
2274 	}
2275 
2276 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2277 	wline[i] = L'\0';
2278 
2279 	if (widthp)
2280 		*widthp = cols;
2281 	if (scrollxp)
2282 		*scrollxp = scrollx;
2283 	if (err)
2284 		free(wline);
2285 	else
2286 		*wlinep = wline;
2287 	return err;
2288 }
2289 
2290 static const struct got_error*
2291 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2292     struct got_object_id *id, struct got_repository *repo)
2293 {
2294 	static const struct got_error *err = NULL;
2295 	struct got_reflist_entry *re;
2296 	char *s;
2297 	const char *name;
2298 
2299 	*refs_str = NULL;
2300 
2301 	TAILQ_FOREACH(re, refs, entry) {
2302 		struct got_tag_object *tag = NULL;
2303 		struct got_object_id *ref_id;
2304 		int cmp;
2305 
2306 		name = got_ref_get_name(re->ref);
2307 		if (strcmp(name, GOT_REF_HEAD) == 0)
2308 			continue;
2309 		if (strncmp(name, "refs/", 5) == 0)
2310 			name += 5;
2311 		if (strncmp(name, "got/", 4) == 0 &&
2312 		    strncmp(name, "got/backup/", 11) != 0)
2313 			continue;
2314 		if (strncmp(name, "heads/", 6) == 0)
2315 			name += 6;
2316 		if (strncmp(name, "remotes/", 8) == 0) {
2317 			name += 8;
2318 			s = strstr(name, "/" GOT_REF_HEAD);
2319 			if (s != NULL && s[strlen(s)] == '\0')
2320 				continue;
2321 		}
2322 		err = got_ref_resolve(&ref_id, repo, re->ref);
2323 		if (err)
2324 			break;
2325 		if (strncmp(name, "tags/", 5) == 0) {
2326 			err = got_object_open_as_tag(&tag, repo, ref_id);
2327 			if (err) {
2328 				if (err->code != GOT_ERR_OBJ_TYPE) {
2329 					free(ref_id);
2330 					break;
2331 				}
2332 				/* Ref points at something other than a tag. */
2333 				err = NULL;
2334 				tag = NULL;
2335 			}
2336 		}
2337 		cmp = got_object_id_cmp(tag ?
2338 		    got_object_tag_get_object_id(tag) : ref_id, id);
2339 		free(ref_id);
2340 		if (tag)
2341 			got_object_tag_close(tag);
2342 		if (cmp != 0)
2343 			continue;
2344 		s = *refs_str;
2345 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2346 		    s ? ", " : "", name) == -1) {
2347 			err = got_error_from_errno("asprintf");
2348 			free(s);
2349 			*refs_str = NULL;
2350 			break;
2351 		}
2352 		free(s);
2353 	}
2354 
2355 	return err;
2356 }
2357 
2358 static const struct got_error *
2359 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2360     int col_tab_align)
2361 {
2362 	char *smallerthan;
2363 
2364 	smallerthan = strchr(author, '<');
2365 	if (smallerthan && smallerthan[1] != '\0')
2366 		author = smallerthan + 1;
2367 	author[strcspn(author, "@>")] = '\0';
2368 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2369 	    col_tab_align, 0);
2370 }
2371 
2372 static const struct got_error *
2373 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2374     struct got_object_id *id, const size_t date_display_cols,
2375     int author_display_cols)
2376 {
2377 	struct tog_log_view_state *s = &view->state.log;
2378 	const struct got_error *err = NULL;
2379 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2380 	char *logmsg0 = NULL, *logmsg = NULL;
2381 	char *author = NULL;
2382 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2383 	int author_width, logmsg_width;
2384 	char *newline, *line = NULL;
2385 	int col, limit, scrollx;
2386 	const int avail = view->ncols;
2387 	struct tm tm;
2388 	time_t committer_time;
2389 	struct tog_color *tc;
2390 
2391 	committer_time = got_object_commit_get_committer_time(commit);
2392 	if (gmtime_r(&committer_time, &tm) == NULL)
2393 		return got_error_from_errno("gmtime_r");
2394 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2395 		return got_error(GOT_ERR_NO_SPACE);
2396 
2397 	if (avail <= date_display_cols)
2398 		limit = MIN(sizeof(datebuf) - 1, avail);
2399 	else
2400 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2401 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2402 	if (tc)
2403 		wattr_on(view->window,
2404 		    COLOR_PAIR(tc->colorpair), NULL);
2405 	waddnstr(view->window, datebuf, limit);
2406 	if (tc)
2407 		wattr_off(view->window,
2408 		    COLOR_PAIR(tc->colorpair), NULL);
2409 	col = limit;
2410 	if (col > avail)
2411 		goto done;
2412 
2413 	if (avail >= 120) {
2414 		char *id_str;
2415 		err = got_object_id_str(&id_str, id);
2416 		if (err)
2417 			goto done;
2418 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2419 		if (tc)
2420 			wattr_on(view->window,
2421 			    COLOR_PAIR(tc->colorpair), NULL);
2422 		wprintw(view->window, "%.8s ", id_str);
2423 		if (tc)
2424 			wattr_off(view->window,
2425 			    COLOR_PAIR(tc->colorpair), NULL);
2426 		free(id_str);
2427 		col += 9;
2428 		if (col > avail)
2429 			goto done;
2430 	}
2431 
2432 	if (s->use_committer)
2433 		author = strdup(got_object_commit_get_committer(commit));
2434 	else
2435 		author = strdup(got_object_commit_get_author(commit));
2436 	if (author == NULL) {
2437 		err = got_error_from_errno("strdup");
2438 		goto done;
2439 	}
2440 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2441 	if (err)
2442 		goto done;
2443 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2444 	if (tc)
2445 		wattr_on(view->window,
2446 		    COLOR_PAIR(tc->colorpair), NULL);
2447 	waddwstr(view->window, wauthor);
2448 	col += author_width;
2449 	while (col < avail && author_width < author_display_cols + 2) {
2450 		waddch(view->window, ' ');
2451 		col++;
2452 		author_width++;
2453 	}
2454 	if (tc)
2455 		wattr_off(view->window,
2456 		    COLOR_PAIR(tc->colorpair), NULL);
2457 	if (col > avail)
2458 		goto done;
2459 
2460 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2461 	if (err)
2462 		goto done;
2463 	logmsg = logmsg0;
2464 	while (*logmsg == '\n')
2465 		logmsg++;
2466 	newline = strchr(logmsg, '\n');
2467 	if (newline)
2468 		*newline = '\0';
2469 	limit = avail - col;
2470 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2471 		limit--;	/* for the border */
2472 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2473 	    limit, col, 1);
2474 	if (err)
2475 		goto done;
2476 	waddwstr(view->window, &wlogmsg[scrollx]);
2477 	col += MAX(logmsg_width, 0);
2478 	while (col < avail) {
2479 		waddch(view->window, ' ');
2480 		col++;
2481 	}
2482 done:
2483 	free(logmsg0);
2484 	free(wlogmsg);
2485 	free(author);
2486 	free(wauthor);
2487 	free(line);
2488 	return err;
2489 }
2490 
2491 static struct commit_queue_entry *
2492 alloc_commit_queue_entry(struct got_commit_object *commit,
2493     struct got_object_id *id)
2494 {
2495 	struct commit_queue_entry *entry;
2496 	struct got_object_id *dup;
2497 
2498 	entry = calloc(1, sizeof(*entry));
2499 	if (entry == NULL)
2500 		return NULL;
2501 
2502 	dup = got_object_id_dup(id);
2503 	if (dup == NULL) {
2504 		free(entry);
2505 		return NULL;
2506 	}
2507 
2508 	entry->id = dup;
2509 	entry->commit = commit;
2510 	return entry;
2511 }
2512 
2513 static void
2514 pop_commit(struct commit_queue *commits)
2515 {
2516 	struct commit_queue_entry *entry;
2517 
2518 	entry = TAILQ_FIRST(&commits->head);
2519 	TAILQ_REMOVE(&commits->head, entry, entry);
2520 	got_object_commit_close(entry->commit);
2521 	commits->ncommits--;
2522 	free(entry->id);
2523 	free(entry);
2524 }
2525 
2526 static void
2527 free_commits(struct commit_queue *commits)
2528 {
2529 	while (!TAILQ_EMPTY(&commits->head))
2530 		pop_commit(commits);
2531 }
2532 
2533 static const struct got_error *
2534 match_commit(int *have_match, struct got_object_id *id,
2535     struct got_commit_object *commit, regex_t *regex)
2536 {
2537 	const struct got_error *err = NULL;
2538 	regmatch_t regmatch;
2539 	char *id_str = NULL, *logmsg = NULL;
2540 
2541 	*have_match = 0;
2542 
2543 	err = got_object_id_str(&id_str, id);
2544 	if (err)
2545 		return err;
2546 
2547 	err = got_object_commit_get_logmsg(&logmsg, commit);
2548 	if (err)
2549 		goto done;
2550 
2551 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2552 	    &regmatch, 0) == 0 ||
2553 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2554 	    &regmatch, 0) == 0 ||
2555 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2556 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2557 		*have_match = 1;
2558 done:
2559 	free(id_str);
2560 	free(logmsg);
2561 	return err;
2562 }
2563 
2564 static const struct got_error *
2565 queue_commits(struct tog_log_thread_args *a)
2566 {
2567 	const struct got_error *err = NULL;
2568 
2569 	/*
2570 	 * We keep all commits open throughout the lifetime of the log
2571 	 * view in order to avoid having to re-fetch commits from disk
2572 	 * while updating the display.
2573 	 */
2574 	do {
2575 		struct got_object_id id;
2576 		struct got_commit_object *commit;
2577 		struct commit_queue_entry *entry;
2578 		int limit_match = 0;
2579 		int errcode;
2580 
2581 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2582 		    NULL, NULL);
2583 		if (err)
2584 			break;
2585 
2586 		err = got_object_open_as_commit(&commit, a->repo, &id);
2587 		if (err)
2588 			break;
2589 		entry = alloc_commit_queue_entry(commit, &id);
2590 		if (entry == NULL) {
2591 			err = got_error_from_errno("alloc_commit_queue_entry");
2592 			break;
2593 		}
2594 
2595 		errcode = pthread_mutex_lock(&tog_mutex);
2596 		if (errcode) {
2597 			err = got_error_set_errno(errcode,
2598 			    "pthread_mutex_lock");
2599 			break;
2600 		}
2601 
2602 		entry->idx = a->real_commits->ncommits;
2603 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2604 		a->real_commits->ncommits++;
2605 
2606 		if (*a->limiting) {
2607 			err = match_commit(&limit_match, &id, commit,
2608 			    a->limit_regex);
2609 			if (err)
2610 				break;
2611 
2612 			if (limit_match) {
2613 				struct commit_queue_entry *matched;
2614 
2615 				matched = alloc_commit_queue_entry(
2616 				    entry->commit, entry->id);
2617 				if (matched == NULL) {
2618 					err = got_error_from_errno(
2619 					    "alloc_commit_queue_entry");
2620 					break;
2621 				}
2622 				matched->commit = entry->commit;
2623 				got_object_commit_retain(entry->commit);
2624 
2625 				matched->idx = a->limit_commits->ncommits;
2626 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2627 				    matched, entry);
2628 				a->limit_commits->ncommits++;
2629 			}
2630 
2631 			/*
2632 			 * This is how we signal log_thread() that we
2633 			 * have found a match, and that it should be
2634 			 * counted as a new entry for the view.
2635 			 */
2636 			a->limit_match = limit_match;
2637 		}
2638 
2639 		if (*a->searching == TOG_SEARCH_FORWARD &&
2640 		    !*a->search_next_done) {
2641 			int have_match;
2642 			err = match_commit(&have_match, &id, commit, a->regex);
2643 			if (err)
2644 				break;
2645 
2646 			if (*a->limiting) {
2647 				if (limit_match && have_match)
2648 					*a->search_next_done =
2649 					    TOG_SEARCH_HAVE_MORE;
2650 			} else if (have_match)
2651 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2652 		}
2653 
2654 		errcode = pthread_mutex_unlock(&tog_mutex);
2655 		if (errcode && err == NULL)
2656 			err = got_error_set_errno(errcode,
2657 			    "pthread_mutex_unlock");
2658 		if (err)
2659 			break;
2660 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2661 
2662 	return err;
2663 }
2664 
2665 static void
2666 select_commit(struct tog_log_view_state *s)
2667 {
2668 	struct commit_queue_entry *entry;
2669 	int ncommits = 0;
2670 
2671 	entry = s->first_displayed_entry;
2672 	while (entry) {
2673 		if (ncommits == s->selected) {
2674 			s->selected_entry = entry;
2675 			break;
2676 		}
2677 		entry = TAILQ_NEXT(entry, entry);
2678 		ncommits++;
2679 	}
2680 }
2681 
2682 static const struct got_error *
2683 draw_commits(struct tog_view *view)
2684 {
2685 	const struct got_error *err = NULL;
2686 	struct tog_log_view_state *s = &view->state.log;
2687 	struct commit_queue_entry *entry = s->selected_entry;
2688 	int limit = view->nlines;
2689 	int width;
2690 	int ncommits, author_cols = 4;
2691 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2692 	char *refs_str = NULL;
2693 	wchar_t *wline;
2694 	struct tog_color *tc;
2695 	static const size_t date_display_cols = 12;
2696 
2697 	if (view_is_hsplit_top(view))
2698 		--limit;  /* account for border */
2699 
2700 	if (s->selected_entry &&
2701 	    !(view->searching && view->search_next_done == 0)) {
2702 		struct got_reflist_head *refs;
2703 		err = got_object_id_str(&id_str, s->selected_entry->id);
2704 		if (err)
2705 			return err;
2706 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2707 		    s->selected_entry->id);
2708 		if (refs) {
2709 			err = build_refs_str(&refs_str, refs,
2710 			    s->selected_entry->id, s->repo);
2711 			if (err)
2712 				goto done;
2713 		}
2714 	}
2715 
2716 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2717 		halfdelay(10); /* disable fast refresh */
2718 
2719 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2720 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2721 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2722 		    (view->searching && !view->search_next_done) ?
2723 		    "searching..." : "loading...") == -1) {
2724 			err = got_error_from_errno("asprintf");
2725 			goto done;
2726 		}
2727 	} else {
2728 		const char *search_str = NULL;
2729 		const char *limit_str = NULL;
2730 
2731 		if (view->searching) {
2732 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2733 				search_str = "no more matches";
2734 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2735 				search_str = "no matches found";
2736 			else if (!view->search_next_done)
2737 				search_str = "searching...";
2738 		}
2739 
2740 		if (s->limit_view && s->commits->ncommits == 0)
2741 			limit_str = "no matches found";
2742 
2743 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2744 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2745 		    search_str ? search_str : (refs_str ? refs_str : ""),
2746 		    limit_str ? limit_str : "") == -1) {
2747 			err = got_error_from_errno("asprintf");
2748 			goto done;
2749 		}
2750 	}
2751 
2752 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2753 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2754 		    "........................................",
2755 		    s->in_repo_path, ncommits_str) == -1) {
2756 			err = got_error_from_errno("asprintf");
2757 			header = NULL;
2758 			goto done;
2759 		}
2760 	} else if (asprintf(&header, "commit %s%s",
2761 	    id_str ? id_str : "........................................",
2762 	    ncommits_str) == -1) {
2763 		err = got_error_from_errno("asprintf");
2764 		header = NULL;
2765 		goto done;
2766 	}
2767 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2768 	if (err)
2769 		goto done;
2770 
2771 	werase(view->window);
2772 
2773 	if (view_needs_focus_indication(view))
2774 		wstandout(view->window);
2775 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2776 	if (tc)
2777 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2778 	waddwstr(view->window, wline);
2779 	while (width < view->ncols) {
2780 		waddch(view->window, ' ');
2781 		width++;
2782 	}
2783 	if (tc)
2784 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2785 	if (view_needs_focus_indication(view))
2786 		wstandend(view->window);
2787 	free(wline);
2788 	if (limit <= 1)
2789 		goto done;
2790 
2791 	/* Grow author column size if necessary, and set view->maxx. */
2792 	entry = s->first_displayed_entry;
2793 	ncommits = 0;
2794 	view->maxx = 0;
2795 	while (entry) {
2796 		struct got_commit_object *c = entry->commit;
2797 		char *author, *eol, *msg, *msg0;
2798 		wchar_t *wauthor, *wmsg;
2799 		int width;
2800 		if (ncommits >= limit - 1)
2801 			break;
2802 		if (s->use_committer)
2803 			author = strdup(got_object_commit_get_committer(c));
2804 		else
2805 			author = strdup(got_object_commit_get_author(c));
2806 		if (author == NULL) {
2807 			err = got_error_from_errno("strdup");
2808 			goto done;
2809 		}
2810 		err = format_author(&wauthor, &width, author, COLS,
2811 		    date_display_cols);
2812 		if (author_cols < width)
2813 			author_cols = width;
2814 		free(wauthor);
2815 		free(author);
2816 		if (err)
2817 			goto done;
2818 		err = got_object_commit_get_logmsg(&msg0, c);
2819 		if (err)
2820 			goto done;
2821 		msg = msg0;
2822 		while (*msg == '\n')
2823 			++msg;
2824 		if ((eol = strchr(msg, '\n')))
2825 			*eol = '\0';
2826 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2827 		    date_display_cols + author_cols, 0);
2828 		if (err)
2829 			goto done;
2830 		view->maxx = MAX(view->maxx, width);
2831 		free(msg0);
2832 		free(wmsg);
2833 		ncommits++;
2834 		entry = TAILQ_NEXT(entry, entry);
2835 	}
2836 
2837 	entry = s->first_displayed_entry;
2838 	s->last_displayed_entry = s->first_displayed_entry;
2839 	ncommits = 0;
2840 	while (entry) {
2841 		if (ncommits >= limit - 1)
2842 			break;
2843 		if (ncommits == s->selected)
2844 			wstandout(view->window);
2845 		err = draw_commit(view, entry->commit, entry->id,
2846 		    date_display_cols, author_cols);
2847 		if (ncommits == s->selected)
2848 			wstandend(view->window);
2849 		if (err)
2850 			goto done;
2851 		ncommits++;
2852 		s->last_displayed_entry = entry;
2853 		entry = TAILQ_NEXT(entry, entry);
2854 	}
2855 
2856 	view_border(view);
2857 done:
2858 	free(id_str);
2859 	free(refs_str);
2860 	free(ncommits_str);
2861 	free(header);
2862 	return err;
2863 }
2864 
2865 static void
2866 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2867 {
2868 	struct commit_queue_entry *entry;
2869 	int nscrolled = 0;
2870 
2871 	entry = TAILQ_FIRST(&s->commits->head);
2872 	if (s->first_displayed_entry == entry)
2873 		return;
2874 
2875 	entry = s->first_displayed_entry;
2876 	while (entry && nscrolled < maxscroll) {
2877 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2878 		if (entry) {
2879 			s->first_displayed_entry = entry;
2880 			nscrolled++;
2881 		}
2882 	}
2883 }
2884 
2885 static const struct got_error *
2886 trigger_log_thread(struct tog_view *view, int wait)
2887 {
2888 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2889 	int errcode;
2890 
2891 	if (!using_mock_io)
2892 		halfdelay(1); /* fast refresh while loading commits */
2893 
2894 	while (!ta->log_complete && !tog_thread_error &&
2895 	    (ta->commits_needed > 0 || ta->load_all)) {
2896 		/* Wake the log thread. */
2897 		errcode = pthread_cond_signal(&ta->need_commits);
2898 		if (errcode)
2899 			return got_error_set_errno(errcode,
2900 			    "pthread_cond_signal");
2901 
2902 		/*
2903 		 * The mutex will be released while the view loop waits
2904 		 * in wgetch(), at which time the log thread will run.
2905 		 */
2906 		if (!wait)
2907 			break;
2908 
2909 		/* Display progress update in log view. */
2910 		show_log_view(view);
2911 		update_panels();
2912 		doupdate();
2913 
2914 		/* Wait right here while next commit is being loaded. */
2915 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2916 		if (errcode)
2917 			return got_error_set_errno(errcode,
2918 			    "pthread_cond_wait");
2919 
2920 		/* Display progress update in log view. */
2921 		show_log_view(view);
2922 		update_panels();
2923 		doupdate();
2924 	}
2925 
2926 	return NULL;
2927 }
2928 
2929 static const struct got_error *
2930 request_log_commits(struct tog_view *view)
2931 {
2932 	struct tog_log_view_state	*state = &view->state.log;
2933 	const struct got_error		*err = NULL;
2934 
2935 	if (state->thread_args.log_complete)
2936 		return NULL;
2937 
2938 	state->thread_args.commits_needed += view->nscrolled;
2939 	err = trigger_log_thread(view, 1);
2940 	view->nscrolled = 0;
2941 
2942 	return err;
2943 }
2944 
2945 static const struct got_error *
2946 log_scroll_down(struct tog_view *view, int maxscroll)
2947 {
2948 	struct tog_log_view_state *s = &view->state.log;
2949 	const struct got_error *err = NULL;
2950 	struct commit_queue_entry *pentry;
2951 	int nscrolled = 0, ncommits_needed;
2952 
2953 	if (s->last_displayed_entry == NULL)
2954 		return NULL;
2955 
2956 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2957 	if (s->commits->ncommits < ncommits_needed &&
2958 	    !s->thread_args.log_complete) {
2959 		/*
2960 		 * Ask the log thread for required amount of commits.
2961 		 */
2962 		s->thread_args.commits_needed +=
2963 		    ncommits_needed - s->commits->ncommits;
2964 		err = trigger_log_thread(view, 1);
2965 		if (err)
2966 			return err;
2967 	}
2968 
2969 	do {
2970 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2971 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2972 			break;
2973 
2974 		s->last_displayed_entry = pentry ?
2975 		    pentry : s->last_displayed_entry;
2976 
2977 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2978 		if (pentry == NULL)
2979 			break;
2980 		s->first_displayed_entry = pentry;
2981 	} while (++nscrolled < maxscroll);
2982 
2983 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2984 		view->nscrolled += nscrolled;
2985 	else
2986 		view->nscrolled = 0;
2987 
2988 	return err;
2989 }
2990 
2991 static const struct got_error *
2992 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2993     struct got_commit_object *commit, struct got_object_id *commit_id,
2994     struct tog_view *log_view, struct got_repository *repo)
2995 {
2996 	const struct got_error *err;
2997 	struct got_object_qid *parent_id;
2998 	struct tog_view *diff_view;
2999 
3000 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3001 	if (diff_view == NULL)
3002 		return got_error_from_errno("view_open");
3003 
3004 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3005 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3006 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3007 	if (err == NULL)
3008 		*new_view = diff_view;
3009 	return err;
3010 }
3011 
3012 static const struct got_error *
3013 tree_view_visit_subtree(struct tog_tree_view_state *s,
3014     struct got_tree_object *subtree)
3015 {
3016 	struct tog_parent_tree *parent;
3017 
3018 	parent = calloc(1, sizeof(*parent));
3019 	if (parent == NULL)
3020 		return got_error_from_errno("calloc");
3021 
3022 	parent->tree = s->tree;
3023 	parent->first_displayed_entry = s->first_displayed_entry;
3024 	parent->selected_entry = s->selected_entry;
3025 	parent->selected = s->selected;
3026 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3027 	s->tree = subtree;
3028 	s->selected = 0;
3029 	s->first_displayed_entry = NULL;
3030 	return NULL;
3031 }
3032 
3033 static const struct got_error *
3034 tree_view_walk_path(struct tog_tree_view_state *s,
3035     struct got_commit_object *commit, const char *path)
3036 {
3037 	const struct got_error *err = NULL;
3038 	struct got_tree_object *tree = NULL;
3039 	const char *p;
3040 	char *slash, *subpath = NULL;
3041 
3042 	/* Walk the path and open corresponding tree objects. */
3043 	p = path;
3044 	while (*p) {
3045 		struct got_tree_entry *te;
3046 		struct got_object_id *tree_id;
3047 		char *te_name;
3048 
3049 		while (p[0] == '/')
3050 			p++;
3051 
3052 		/* Ensure the correct subtree entry is selected. */
3053 		slash = strchr(p, '/');
3054 		if (slash == NULL)
3055 			te_name = strdup(p);
3056 		else
3057 			te_name = strndup(p, slash - p);
3058 		if (te_name == NULL) {
3059 			err = got_error_from_errno("strndup");
3060 			break;
3061 		}
3062 		te = got_object_tree_find_entry(s->tree, te_name);
3063 		if (te == NULL) {
3064 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3065 			free(te_name);
3066 			break;
3067 		}
3068 		free(te_name);
3069 		s->first_displayed_entry = s->selected_entry = te;
3070 
3071 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3072 			break; /* jump to this file's entry */
3073 
3074 		slash = strchr(p, '/');
3075 		if (slash)
3076 			subpath = strndup(path, slash - path);
3077 		else
3078 			subpath = strdup(path);
3079 		if (subpath == NULL) {
3080 			err = got_error_from_errno("strdup");
3081 			break;
3082 		}
3083 
3084 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3085 		    subpath);
3086 		if (err)
3087 			break;
3088 
3089 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3090 		free(tree_id);
3091 		if (err)
3092 			break;
3093 
3094 		err = tree_view_visit_subtree(s, tree);
3095 		if (err) {
3096 			got_object_tree_close(tree);
3097 			break;
3098 		}
3099 		if (slash == NULL)
3100 			break;
3101 		free(subpath);
3102 		subpath = NULL;
3103 		p = slash;
3104 	}
3105 
3106 	free(subpath);
3107 	return err;
3108 }
3109 
3110 static const struct got_error *
3111 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3112     struct commit_queue_entry *entry, const char *path,
3113     const char *head_ref_name, struct got_repository *repo)
3114 {
3115 	const struct got_error *err = NULL;
3116 	struct tog_tree_view_state *s;
3117 	struct tog_view *tree_view;
3118 
3119 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3120 	if (tree_view == NULL)
3121 		return got_error_from_errno("view_open");
3122 
3123 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3124 	if (err)
3125 		return err;
3126 	s = &tree_view->state.tree;
3127 
3128 	*new_view = tree_view;
3129 
3130 	if (got_path_is_root_dir(path))
3131 		return NULL;
3132 
3133 	return tree_view_walk_path(s, entry->commit, path);
3134 }
3135 
3136 static const struct got_error *
3137 block_signals_used_by_main_thread(void)
3138 {
3139 	sigset_t sigset;
3140 	int errcode;
3141 
3142 	if (sigemptyset(&sigset) == -1)
3143 		return got_error_from_errno("sigemptyset");
3144 
3145 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3146 	if (sigaddset(&sigset, SIGWINCH) == -1)
3147 		return got_error_from_errno("sigaddset");
3148 	if (sigaddset(&sigset, SIGCONT) == -1)
3149 		return got_error_from_errno("sigaddset");
3150 	if (sigaddset(&sigset, SIGINT) == -1)
3151 		return got_error_from_errno("sigaddset");
3152 	if (sigaddset(&sigset, SIGTERM) == -1)
3153 		return got_error_from_errno("sigaddset");
3154 
3155 	/* ncurses handles SIGTSTP */
3156 	if (sigaddset(&sigset, SIGTSTP) == -1)
3157 		return got_error_from_errno("sigaddset");
3158 
3159 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3160 	if (errcode)
3161 		return got_error_set_errno(errcode, "pthread_sigmask");
3162 
3163 	return NULL;
3164 }
3165 
3166 static void *
3167 log_thread(void *arg)
3168 {
3169 	const struct got_error *err = NULL;
3170 	int errcode = 0;
3171 	struct tog_log_thread_args *a = arg;
3172 	int done = 0;
3173 
3174 	/*
3175 	 * Sync startup with main thread such that we begin our
3176 	 * work once view_input() has released the mutex.
3177 	 */
3178 	errcode = pthread_mutex_lock(&tog_mutex);
3179 	if (errcode) {
3180 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3181 		return (void *)err;
3182 	}
3183 
3184 	err = block_signals_used_by_main_thread();
3185 	if (err) {
3186 		pthread_mutex_unlock(&tog_mutex);
3187 		goto done;
3188 	}
3189 
3190 	while (!done && !err && !tog_fatal_signal_received()) {
3191 		errcode = pthread_mutex_unlock(&tog_mutex);
3192 		if (errcode) {
3193 			err = got_error_set_errno(errcode,
3194 			    "pthread_mutex_unlock");
3195 			goto done;
3196 		}
3197 		err = queue_commits(a);
3198 		if (err) {
3199 			if (err->code != GOT_ERR_ITER_COMPLETED)
3200 				goto done;
3201 			err = NULL;
3202 			done = 1;
3203 		} else if (a->commits_needed > 0 && !a->load_all) {
3204 			if (*a->limiting) {
3205 				if (a->limit_match)
3206 					a->commits_needed--;
3207 			} else
3208 				a->commits_needed--;
3209 		}
3210 
3211 		errcode = pthread_mutex_lock(&tog_mutex);
3212 		if (errcode) {
3213 			err = got_error_set_errno(errcode,
3214 			    "pthread_mutex_lock");
3215 			goto done;
3216 		} else if (*a->quit)
3217 			done = 1;
3218 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3219 			*a->first_displayed_entry =
3220 			    TAILQ_FIRST(&a->limit_commits->head);
3221 			*a->selected_entry = *a->first_displayed_entry;
3222 		} else if (*a->first_displayed_entry == NULL) {
3223 			*a->first_displayed_entry =
3224 			    TAILQ_FIRST(&a->real_commits->head);
3225 			*a->selected_entry = *a->first_displayed_entry;
3226 		}
3227 
3228 		errcode = pthread_cond_signal(&a->commit_loaded);
3229 		if (errcode) {
3230 			err = got_error_set_errno(errcode,
3231 			    "pthread_cond_signal");
3232 			pthread_mutex_unlock(&tog_mutex);
3233 			goto done;
3234 		}
3235 
3236 		if (done)
3237 			a->commits_needed = 0;
3238 		else {
3239 			if (a->commits_needed == 0 && !a->load_all) {
3240 				errcode = pthread_cond_wait(&a->need_commits,
3241 				    &tog_mutex);
3242 				if (errcode) {
3243 					err = got_error_set_errno(errcode,
3244 					    "pthread_cond_wait");
3245 					pthread_mutex_unlock(&tog_mutex);
3246 					goto done;
3247 				}
3248 				if (*a->quit)
3249 					done = 1;
3250 			}
3251 		}
3252 	}
3253 	a->log_complete = 1;
3254 	errcode = pthread_mutex_unlock(&tog_mutex);
3255 	if (errcode)
3256 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3257 done:
3258 	if (err) {
3259 		tog_thread_error = 1;
3260 		pthread_cond_signal(&a->commit_loaded);
3261 	}
3262 	return (void *)err;
3263 }
3264 
3265 static const struct got_error *
3266 stop_log_thread(struct tog_log_view_state *s)
3267 {
3268 	const struct got_error *err = NULL, *thread_err = NULL;
3269 	int errcode;
3270 
3271 	if (s->thread) {
3272 		s->quit = 1;
3273 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3274 		if (errcode)
3275 			return got_error_set_errno(errcode,
3276 			    "pthread_cond_signal");
3277 		errcode = pthread_mutex_unlock(&tog_mutex);
3278 		if (errcode)
3279 			return got_error_set_errno(errcode,
3280 			    "pthread_mutex_unlock");
3281 		errcode = pthread_join(s->thread, (void **)&thread_err);
3282 		if (errcode)
3283 			return got_error_set_errno(errcode, "pthread_join");
3284 		errcode = pthread_mutex_lock(&tog_mutex);
3285 		if (errcode)
3286 			return got_error_set_errno(errcode,
3287 			    "pthread_mutex_lock");
3288 		s->thread = NULL;
3289 	}
3290 
3291 	if (s->thread_args.repo) {
3292 		err = got_repo_close(s->thread_args.repo);
3293 		s->thread_args.repo = NULL;
3294 	}
3295 
3296 	if (s->thread_args.pack_fds) {
3297 		const struct got_error *pack_err =
3298 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3299 		if (err == NULL)
3300 			err = pack_err;
3301 		s->thread_args.pack_fds = NULL;
3302 	}
3303 
3304 	if (s->thread_args.graph) {
3305 		got_commit_graph_close(s->thread_args.graph);
3306 		s->thread_args.graph = NULL;
3307 	}
3308 
3309 	return err ? err : thread_err;
3310 }
3311 
3312 static const struct got_error *
3313 close_log_view(struct tog_view *view)
3314 {
3315 	const struct got_error *err = NULL;
3316 	struct tog_log_view_state *s = &view->state.log;
3317 	int errcode;
3318 
3319 	err = stop_log_thread(s);
3320 
3321 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3322 	if (errcode && err == NULL)
3323 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3324 
3325 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3326 	if (errcode && err == NULL)
3327 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3328 
3329 	free_commits(&s->limit_commits);
3330 	free_commits(&s->real_commits);
3331 	free(s->in_repo_path);
3332 	s->in_repo_path = NULL;
3333 	free(s->start_id);
3334 	s->start_id = NULL;
3335 	free(s->head_ref_name);
3336 	s->head_ref_name = NULL;
3337 	return err;
3338 }
3339 
3340 /*
3341  * We use two queues to implement the limit feature: first consists of
3342  * commits matching the current limit_regex; second is the real queue
3343  * of all known commits (real_commits). When the user starts limiting,
3344  * we swap queues such that all movement and displaying functionality
3345  * works with very slight change.
3346  */
3347 static const struct got_error *
3348 limit_log_view(struct tog_view *view)
3349 {
3350 	struct tog_log_view_state *s = &view->state.log;
3351 	struct commit_queue_entry *entry;
3352 	struct tog_view	*v = view;
3353 	const struct got_error *err = NULL;
3354 	char pattern[1024];
3355 	int ret;
3356 
3357 	if (view_is_hsplit_top(view))
3358 		v = view->child;
3359 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3360 		v = view->parent;
3361 
3362 	/* Get the pattern */
3363 	wmove(v->window, v->nlines - 1, 0);
3364 	wclrtoeol(v->window);
3365 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3366 	nodelay(v->window, FALSE);
3367 	nocbreak();
3368 	echo();
3369 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3370 	cbreak();
3371 	noecho();
3372 	nodelay(v->window, TRUE);
3373 	if (ret == ERR)
3374 		return NULL;
3375 
3376 	if (*pattern == '\0') {
3377 		/*
3378 		 * Safety measure for the situation where the user
3379 		 * resets limit without previously limiting anything.
3380 		 */
3381 		if (!s->limit_view)
3382 			return NULL;
3383 
3384 		/*
3385 		 * User could have pressed Ctrl+L, which refreshed the
3386 		 * commit queues, it means we can't save previously
3387 		 * (before limit took place) displayed entries,
3388 		 * because they would point to already free'ed memory,
3389 		 * so we are forced to always select first entry of
3390 		 * the queue.
3391 		 */
3392 		s->commits = &s->real_commits;
3393 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3394 		s->selected_entry = s->first_displayed_entry;
3395 		s->selected = 0;
3396 		s->limit_view = 0;
3397 
3398 		return NULL;
3399 	}
3400 
3401 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3402 		return NULL;
3403 
3404 	s->limit_view = 1;
3405 
3406 	/* Clear the screen while loading limit view */
3407 	s->first_displayed_entry = NULL;
3408 	s->last_displayed_entry = NULL;
3409 	s->selected_entry = NULL;
3410 	s->commits = &s->limit_commits;
3411 
3412 	/* Prepare limit queue for new search */
3413 	free_commits(&s->limit_commits);
3414 	s->limit_commits.ncommits = 0;
3415 
3416 	/* First process commits, which are in queue already */
3417 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3418 		int have_match = 0;
3419 
3420 		err = match_commit(&have_match, entry->id,
3421 		    entry->commit, &s->limit_regex);
3422 		if (err)
3423 			return err;
3424 
3425 		if (have_match) {
3426 			struct commit_queue_entry *matched;
3427 
3428 			matched = alloc_commit_queue_entry(entry->commit,
3429 			    entry->id);
3430 			if (matched == NULL) {
3431 				err = got_error_from_errno(
3432 				    "alloc_commit_queue_entry");
3433 				break;
3434 			}
3435 			matched->commit = entry->commit;
3436 			got_object_commit_retain(entry->commit);
3437 
3438 			matched->idx = s->limit_commits.ncommits;
3439 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3440 			    matched, entry);
3441 			s->limit_commits.ncommits++;
3442 		}
3443 	}
3444 
3445 	/* Second process all the commits, until we fill the screen */
3446 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3447 	    !s->thread_args.log_complete) {
3448 		s->thread_args.commits_needed +=
3449 		    view->nlines - s->limit_commits.ncommits - 1;
3450 		err = trigger_log_thread(view, 1);
3451 		if (err)
3452 			return err;
3453 	}
3454 
3455 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3456 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3457 	s->selected = 0;
3458 
3459 	return NULL;
3460 }
3461 
3462 static const struct got_error *
3463 search_start_log_view(struct tog_view *view)
3464 {
3465 	struct tog_log_view_state *s = &view->state.log;
3466 
3467 	s->matched_entry = NULL;
3468 	s->search_entry = NULL;
3469 	return NULL;
3470 }
3471 
3472 static const struct got_error *
3473 search_next_log_view(struct tog_view *view)
3474 {
3475 	const struct got_error *err = NULL;
3476 	struct tog_log_view_state *s = &view->state.log;
3477 	struct commit_queue_entry *entry;
3478 
3479 	/* Display progress update in log view. */
3480 	show_log_view(view);
3481 	update_panels();
3482 	doupdate();
3483 
3484 	if (s->search_entry) {
3485 		int errcode, ch;
3486 		errcode = pthread_mutex_unlock(&tog_mutex);
3487 		if (errcode)
3488 			return got_error_set_errno(errcode,
3489 			    "pthread_mutex_unlock");
3490 		ch = wgetch(view->window);
3491 		errcode = pthread_mutex_lock(&tog_mutex);
3492 		if (errcode)
3493 			return got_error_set_errno(errcode,
3494 			    "pthread_mutex_lock");
3495 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3496 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3497 			return NULL;
3498 		}
3499 		if (view->searching == TOG_SEARCH_FORWARD)
3500 			entry = TAILQ_NEXT(s->search_entry, entry);
3501 		else
3502 			entry = TAILQ_PREV(s->search_entry,
3503 			    commit_queue_head, entry);
3504 	} else if (s->matched_entry) {
3505 		/*
3506 		 * If the user has moved the cursor after we hit a match,
3507 		 * the position from where we should continue searching
3508 		 * might have changed.
3509 		 */
3510 		if (view->searching == TOG_SEARCH_FORWARD)
3511 			entry = TAILQ_NEXT(s->selected_entry, entry);
3512 		else
3513 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3514 			    entry);
3515 	} else {
3516 		entry = s->selected_entry;
3517 	}
3518 
3519 	while (1) {
3520 		int have_match = 0;
3521 
3522 		if (entry == NULL) {
3523 			if (s->thread_args.log_complete ||
3524 			    view->searching == TOG_SEARCH_BACKWARD) {
3525 				view->search_next_done =
3526 				    (s->matched_entry == NULL ?
3527 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3528 				s->search_entry = NULL;
3529 				return NULL;
3530 			}
3531 			/*
3532 			 * Poke the log thread for more commits and return,
3533 			 * allowing the main loop to make progress. Search
3534 			 * will resume at s->search_entry once we come back.
3535 			 */
3536 			s->thread_args.commits_needed++;
3537 			return trigger_log_thread(view, 0);
3538 		}
3539 
3540 		err = match_commit(&have_match, entry->id, entry->commit,
3541 		    &view->regex);
3542 		if (err)
3543 			break;
3544 		if (have_match) {
3545 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3546 			s->matched_entry = entry;
3547 			break;
3548 		}
3549 
3550 		s->search_entry = entry;
3551 		if (view->searching == TOG_SEARCH_FORWARD)
3552 			entry = TAILQ_NEXT(entry, entry);
3553 		else
3554 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3555 	}
3556 
3557 	if (s->matched_entry) {
3558 		int cur = s->selected_entry->idx;
3559 		while (cur < s->matched_entry->idx) {
3560 			err = input_log_view(NULL, view, KEY_DOWN);
3561 			if (err)
3562 				return err;
3563 			cur++;
3564 		}
3565 		while (cur > s->matched_entry->idx) {
3566 			err = input_log_view(NULL, view, KEY_UP);
3567 			if (err)
3568 				return err;
3569 			cur--;
3570 		}
3571 	}
3572 
3573 	s->search_entry = NULL;
3574 
3575 	return NULL;
3576 }
3577 
3578 static const struct got_error *
3579 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3580     struct got_repository *repo, const char *head_ref_name,
3581     const char *in_repo_path, int log_branches)
3582 {
3583 	const struct got_error *err = NULL;
3584 	struct tog_log_view_state *s = &view->state.log;
3585 	struct got_repository *thread_repo = NULL;
3586 	struct got_commit_graph *thread_graph = NULL;
3587 	int errcode;
3588 
3589 	if (in_repo_path != s->in_repo_path) {
3590 		free(s->in_repo_path);
3591 		s->in_repo_path = strdup(in_repo_path);
3592 		if (s->in_repo_path == NULL) {
3593 			err = got_error_from_errno("strdup");
3594 			goto done;
3595 		}
3596 	}
3597 
3598 	/* The commit queue only contains commits being displayed. */
3599 	TAILQ_INIT(&s->real_commits.head);
3600 	s->real_commits.ncommits = 0;
3601 	s->commits = &s->real_commits;
3602 
3603 	TAILQ_INIT(&s->limit_commits.head);
3604 	s->limit_view = 0;
3605 	s->limit_commits.ncommits = 0;
3606 
3607 	s->repo = repo;
3608 	if (head_ref_name) {
3609 		s->head_ref_name = strdup(head_ref_name);
3610 		if (s->head_ref_name == NULL) {
3611 			err = got_error_from_errno("strdup");
3612 			goto done;
3613 		}
3614 	}
3615 	s->start_id = got_object_id_dup(start_id);
3616 	if (s->start_id == NULL) {
3617 		err = got_error_from_errno("got_object_id_dup");
3618 		goto done;
3619 	}
3620 	s->log_branches = log_branches;
3621 	s->use_committer = 1;
3622 
3623 	STAILQ_INIT(&s->colors);
3624 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3625 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3626 		    get_color_value("TOG_COLOR_COMMIT"));
3627 		if (err)
3628 			goto done;
3629 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3630 		    get_color_value("TOG_COLOR_AUTHOR"));
3631 		if (err) {
3632 			free_colors(&s->colors);
3633 			goto done;
3634 		}
3635 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3636 		    get_color_value("TOG_COLOR_DATE"));
3637 		if (err) {
3638 			free_colors(&s->colors);
3639 			goto done;
3640 		}
3641 	}
3642 
3643 	view->show = show_log_view;
3644 	view->input = input_log_view;
3645 	view->resize = resize_log_view;
3646 	view->close = close_log_view;
3647 	view->search_start = search_start_log_view;
3648 	view->search_next = search_next_log_view;
3649 
3650 	if (s->thread_args.pack_fds == NULL) {
3651 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3652 		if (err)
3653 			goto done;
3654 	}
3655 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3656 	    s->thread_args.pack_fds);
3657 	if (err)
3658 		goto done;
3659 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3660 	    !s->log_branches);
3661 	if (err)
3662 		goto done;
3663 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3664 	    s->repo, NULL, NULL);
3665 	if (err)
3666 		goto done;
3667 
3668 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3669 	if (errcode) {
3670 		err = got_error_set_errno(errcode, "pthread_cond_init");
3671 		goto done;
3672 	}
3673 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3674 	if (errcode) {
3675 		err = got_error_set_errno(errcode, "pthread_cond_init");
3676 		goto done;
3677 	}
3678 
3679 	s->thread_args.commits_needed = view->nlines;
3680 	s->thread_args.graph = thread_graph;
3681 	s->thread_args.real_commits = &s->real_commits;
3682 	s->thread_args.limit_commits = &s->limit_commits;
3683 	s->thread_args.in_repo_path = s->in_repo_path;
3684 	s->thread_args.start_id = s->start_id;
3685 	s->thread_args.repo = thread_repo;
3686 	s->thread_args.log_complete = 0;
3687 	s->thread_args.quit = &s->quit;
3688 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3689 	s->thread_args.selected_entry = &s->selected_entry;
3690 	s->thread_args.searching = &view->searching;
3691 	s->thread_args.search_next_done = &view->search_next_done;
3692 	s->thread_args.regex = &view->regex;
3693 	s->thread_args.limiting = &s->limit_view;
3694 	s->thread_args.limit_regex = &s->limit_regex;
3695 	s->thread_args.limit_commits = &s->limit_commits;
3696 done:
3697 	if (err) {
3698 		if (view->close == NULL)
3699 			close_log_view(view);
3700 		view_close(view);
3701 	}
3702 	return err;
3703 }
3704 
3705 static const struct got_error *
3706 show_log_view(struct tog_view *view)
3707 {
3708 	const struct got_error *err;
3709 	struct tog_log_view_state *s = &view->state.log;
3710 
3711 	if (s->thread == NULL) {
3712 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3713 		    &s->thread_args);
3714 		if (errcode)
3715 			return got_error_set_errno(errcode, "pthread_create");
3716 		if (s->thread_args.commits_needed > 0) {
3717 			err = trigger_log_thread(view, 1);
3718 			if (err)
3719 				return err;
3720 		}
3721 	}
3722 
3723 	return draw_commits(view);
3724 }
3725 
3726 static void
3727 log_move_cursor_up(struct tog_view *view, int page, int home)
3728 {
3729 	struct tog_log_view_state *s = &view->state.log;
3730 
3731 	if (s->first_displayed_entry == NULL)
3732 		return;
3733 	if (s->selected_entry->idx == 0)
3734 		view->count = 0;
3735 
3736 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3737 	    || home)
3738 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3739 
3740 	if (!page && !home && s->selected > 0)
3741 		--s->selected;
3742 	else
3743 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3744 
3745 	select_commit(s);
3746 	return;
3747 }
3748 
3749 static const struct got_error *
3750 log_move_cursor_down(struct tog_view *view, int page)
3751 {
3752 	struct tog_log_view_state	*s = &view->state.log;
3753 	const struct got_error		*err = NULL;
3754 	int				 eos = view->nlines - 2;
3755 
3756 	if (s->first_displayed_entry == NULL)
3757 		return NULL;
3758 
3759 	if (s->thread_args.log_complete &&
3760 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3761 		return NULL;
3762 
3763 	if (view_is_hsplit_top(view))
3764 		--eos;  /* border consumes the last line */
3765 
3766 	if (!page) {
3767 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3768 			++s->selected;
3769 		else
3770 			err = log_scroll_down(view, 1);
3771 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3772 		struct commit_queue_entry *entry;
3773 		int n;
3774 
3775 		s->selected = 0;
3776 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3777 		s->last_displayed_entry = entry;
3778 		for (n = 0; n <= eos; n++) {
3779 			if (entry == NULL)
3780 				break;
3781 			s->first_displayed_entry = entry;
3782 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3783 		}
3784 		if (n > 0)
3785 			s->selected = n - 1;
3786 	} else {
3787 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3788 		    s->thread_args.log_complete)
3789 			s->selected += MIN(page,
3790 			    s->commits->ncommits - s->selected_entry->idx - 1);
3791 		else
3792 			err = log_scroll_down(view, page);
3793 	}
3794 	if (err)
3795 		return err;
3796 
3797 	/*
3798 	 * We might necessarily overshoot in horizontal
3799 	 * splits; if so, select the last displayed commit.
3800 	 */
3801 	if (s->first_displayed_entry && s->last_displayed_entry) {
3802 		s->selected = MIN(s->selected,
3803 		    s->last_displayed_entry->idx -
3804 		    s->first_displayed_entry->idx);
3805 	}
3806 
3807 	select_commit(s);
3808 
3809 	if (s->thread_args.log_complete &&
3810 	    s->selected_entry->idx == s->commits->ncommits - 1)
3811 		view->count = 0;
3812 
3813 	return NULL;
3814 }
3815 
3816 static void
3817 view_get_split(struct tog_view *view, int *y, int *x)
3818 {
3819 	*x = 0;
3820 	*y = 0;
3821 
3822 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3823 		if (view->child && view->child->resized_y)
3824 			*y = view->child->resized_y;
3825 		else if (view->resized_y)
3826 			*y = view->resized_y;
3827 		else
3828 			*y = view_split_begin_y(view->lines);
3829 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3830 		if (view->child && view->child->resized_x)
3831 			*x = view->child->resized_x;
3832 		else if (view->resized_x)
3833 			*x = view->resized_x;
3834 		else
3835 			*x = view_split_begin_x(view->begin_x);
3836 	}
3837 }
3838 
3839 /* Split view horizontally at y and offset view->state->selected line. */
3840 static const struct got_error *
3841 view_init_hsplit(struct tog_view *view, int y)
3842 {
3843 	const struct got_error *err = NULL;
3844 
3845 	view->nlines = y;
3846 	view->ncols = COLS;
3847 	err = view_resize(view);
3848 	if (err)
3849 		return err;
3850 
3851 	err = offset_selection_down(view);
3852 
3853 	return err;
3854 }
3855 
3856 static const struct got_error *
3857 log_goto_line(struct tog_view *view, int nlines)
3858 {
3859 	const struct got_error		*err = NULL;
3860 	struct tog_log_view_state	*s = &view->state.log;
3861 	int				 g, idx = s->selected_entry->idx;
3862 
3863 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3864 		return NULL;
3865 
3866 	g = view->gline;
3867 	view->gline = 0;
3868 
3869 	if (g >= s->first_displayed_entry->idx + 1 &&
3870 	    g <= s->last_displayed_entry->idx + 1 &&
3871 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3872 		s->selected = g - s->first_displayed_entry->idx - 1;
3873 		select_commit(s);
3874 		return NULL;
3875 	}
3876 
3877 	if (idx + 1 < g) {
3878 		err = log_move_cursor_down(view, g - idx - 1);
3879 		if (!err && g > s->selected_entry->idx + 1)
3880 			err = log_move_cursor_down(view,
3881 			    g - s->first_displayed_entry->idx - 1);
3882 		if (err)
3883 			return err;
3884 	} else if (idx + 1 > g)
3885 		log_move_cursor_up(view, idx - g + 1, 0);
3886 
3887 	if (g < nlines && s->first_displayed_entry->idx == 0)
3888 		s->selected = g - 1;
3889 
3890 	select_commit(s);
3891 	return NULL;
3892 
3893 }
3894 
3895 static void
3896 horizontal_scroll_input(struct tog_view *view, int ch)
3897 {
3898 
3899 	switch (ch) {
3900 	case KEY_LEFT:
3901 	case 'h':
3902 		view->x -= MIN(view->x, 2);
3903 		if (view->x <= 0)
3904 			view->count = 0;
3905 		break;
3906 	case KEY_RIGHT:
3907 	case 'l':
3908 		if (view->x + view->ncols / 2 < view->maxx)
3909 			view->x += 2;
3910 		else
3911 			view->count = 0;
3912 		break;
3913 	case '0':
3914 		view->x = 0;
3915 		break;
3916 	case '$':
3917 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3918 		view->count = 0;
3919 		break;
3920 	default:
3921 		break;
3922 	}
3923 }
3924 
3925 static const struct got_error *
3926 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3927 {
3928 	const struct got_error *err = NULL;
3929 	struct tog_log_view_state *s = &view->state.log;
3930 	int eos, nscroll;
3931 
3932 	if (s->thread_args.load_all) {
3933 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3934 			s->thread_args.load_all = 0;
3935 		else if (s->thread_args.log_complete) {
3936 			err = log_move_cursor_down(view, s->commits->ncommits);
3937 			s->thread_args.load_all = 0;
3938 		}
3939 		if (err)
3940 			return err;
3941 	}
3942 
3943 	eos = nscroll = view->nlines - 1;
3944 	if (view_is_hsplit_top(view))
3945 		--eos;  /* border */
3946 
3947 	if (view->gline)
3948 		return log_goto_line(view, eos);
3949 
3950 	switch (ch) {
3951 	case '&':
3952 		err = limit_log_view(view);
3953 		break;
3954 	case 'q':
3955 		s->quit = 1;
3956 		break;
3957 	case '0':
3958 	case '$':
3959 	case KEY_RIGHT:
3960 	case 'l':
3961 	case KEY_LEFT:
3962 	case 'h':
3963 		horizontal_scroll_input(view, ch);
3964 		break;
3965 	case 'k':
3966 	case KEY_UP:
3967 	case '<':
3968 	case ',':
3969 	case CTRL('p'):
3970 		log_move_cursor_up(view, 0, 0);
3971 		break;
3972 	case 'g':
3973 	case '=':
3974 	case KEY_HOME:
3975 		log_move_cursor_up(view, 0, 1);
3976 		view->count = 0;
3977 		break;
3978 	case CTRL('u'):
3979 	case 'u':
3980 		nscroll /= 2;
3981 		/* FALL THROUGH */
3982 	case KEY_PPAGE:
3983 	case CTRL('b'):
3984 	case 'b':
3985 		log_move_cursor_up(view, nscroll, 0);
3986 		break;
3987 	case 'j':
3988 	case KEY_DOWN:
3989 	case '>':
3990 	case '.':
3991 	case CTRL('n'):
3992 		err = log_move_cursor_down(view, 0);
3993 		break;
3994 	case '@':
3995 		s->use_committer = !s->use_committer;
3996 		view->action = s->use_committer ?
3997 		    "show committer" : "show commit author";
3998 		break;
3999 	case 'G':
4000 	case '*':
4001 	case KEY_END: {
4002 		/* We don't know yet how many commits, so we're forced to
4003 		 * traverse them all. */
4004 		view->count = 0;
4005 		s->thread_args.load_all = 1;
4006 		if (!s->thread_args.log_complete)
4007 			return trigger_log_thread(view, 0);
4008 		err = log_move_cursor_down(view, s->commits->ncommits);
4009 		s->thread_args.load_all = 0;
4010 		break;
4011 	}
4012 	case CTRL('d'):
4013 	case 'd':
4014 		nscroll /= 2;
4015 		/* FALL THROUGH */
4016 	case KEY_NPAGE:
4017 	case CTRL('f'):
4018 	case 'f':
4019 	case ' ':
4020 		err = log_move_cursor_down(view, nscroll);
4021 		break;
4022 	case KEY_RESIZE:
4023 		if (s->selected > view->nlines - 2)
4024 			s->selected = view->nlines - 2;
4025 		if (s->selected > s->commits->ncommits - 1)
4026 			s->selected = s->commits->ncommits - 1;
4027 		select_commit(s);
4028 		if (s->commits->ncommits < view->nlines - 1 &&
4029 		    !s->thread_args.log_complete) {
4030 			s->thread_args.commits_needed += (view->nlines - 1) -
4031 			    s->commits->ncommits;
4032 			err = trigger_log_thread(view, 1);
4033 		}
4034 		break;
4035 	case KEY_ENTER:
4036 	case '\r':
4037 		view->count = 0;
4038 		if (s->selected_entry == NULL)
4039 			break;
4040 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4041 		break;
4042 	case 'T':
4043 		view->count = 0;
4044 		if (s->selected_entry == NULL)
4045 			break;
4046 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4047 		break;
4048 	case KEY_BACKSPACE:
4049 	case CTRL('l'):
4050 	case 'B':
4051 		view->count = 0;
4052 		if (ch == KEY_BACKSPACE &&
4053 		    got_path_is_root_dir(s->in_repo_path))
4054 			break;
4055 		err = stop_log_thread(s);
4056 		if (err)
4057 			return err;
4058 		if (ch == KEY_BACKSPACE) {
4059 			char *parent_path;
4060 			err = got_path_dirname(&parent_path, s->in_repo_path);
4061 			if (err)
4062 				return err;
4063 			free(s->in_repo_path);
4064 			s->in_repo_path = parent_path;
4065 			s->thread_args.in_repo_path = s->in_repo_path;
4066 		} else if (ch == CTRL('l')) {
4067 			struct got_object_id *start_id;
4068 			err = got_repo_match_object_id(&start_id, NULL,
4069 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4070 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4071 			if (err) {
4072 				if (s->head_ref_name == NULL ||
4073 				    err->code != GOT_ERR_NOT_REF)
4074 					return err;
4075 				/* Try to cope with deleted references. */
4076 				free(s->head_ref_name);
4077 				s->head_ref_name = NULL;
4078 				err = got_repo_match_object_id(&start_id,
4079 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4080 				    &tog_refs, s->repo);
4081 				if (err)
4082 					return err;
4083 			}
4084 			free(s->start_id);
4085 			s->start_id = start_id;
4086 			s->thread_args.start_id = s->start_id;
4087 		} else /* 'B' */
4088 			s->log_branches = !s->log_branches;
4089 
4090 		if (s->thread_args.pack_fds == NULL) {
4091 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4092 			if (err)
4093 				return err;
4094 		}
4095 		err = got_repo_open(&s->thread_args.repo,
4096 		    got_repo_get_path(s->repo), NULL,
4097 		    s->thread_args.pack_fds);
4098 		if (err)
4099 			return err;
4100 		tog_free_refs();
4101 		err = tog_load_refs(s->repo, 0);
4102 		if (err)
4103 			return err;
4104 		err = got_commit_graph_open(&s->thread_args.graph,
4105 		    s->in_repo_path, !s->log_branches);
4106 		if (err)
4107 			return err;
4108 		err = got_commit_graph_iter_start(s->thread_args.graph,
4109 		    s->start_id, s->repo, NULL, NULL);
4110 		if (err)
4111 			return err;
4112 		free_commits(&s->real_commits);
4113 		free_commits(&s->limit_commits);
4114 		s->first_displayed_entry = NULL;
4115 		s->last_displayed_entry = NULL;
4116 		s->selected_entry = NULL;
4117 		s->selected = 0;
4118 		s->thread_args.log_complete = 0;
4119 		s->quit = 0;
4120 		s->thread_args.commits_needed = view->lines;
4121 		s->matched_entry = NULL;
4122 		s->search_entry = NULL;
4123 		view->offset = 0;
4124 		break;
4125 	case 'R':
4126 		view->count = 0;
4127 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4128 		break;
4129 	default:
4130 		view->count = 0;
4131 		break;
4132 	}
4133 
4134 	return err;
4135 }
4136 
4137 static const struct got_error *
4138 apply_unveil(const char *repo_path, const char *worktree_path)
4139 {
4140 	const struct got_error *error;
4141 
4142 #ifdef PROFILE
4143 	if (unveil("gmon.out", "rwc") != 0)
4144 		return got_error_from_errno2("unveil", "gmon.out");
4145 #endif
4146 	if (repo_path && unveil(repo_path, "r") != 0)
4147 		return got_error_from_errno2("unveil", repo_path);
4148 
4149 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4150 		return got_error_from_errno2("unveil", worktree_path);
4151 
4152 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4153 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4154 
4155 	error = got_privsep_unveil_exec_helpers();
4156 	if (error != NULL)
4157 		return error;
4158 
4159 	if (unveil(NULL, NULL) != 0)
4160 		return got_error_from_errno("unveil");
4161 
4162 	return NULL;
4163 }
4164 
4165 static const struct got_error *
4166 init_mock_term(const char *test_script_path)
4167 {
4168 	const struct got_error	*err = NULL;
4169 
4170 	if (test_script_path == NULL || *test_script_path == '\0')
4171 		return got_error_msg(GOT_ERR_IO, "GOT_TOG_TEST not defined");
4172 
4173 	tog_io.f = fopen(test_script_path, "re");
4174 	if (tog_io.f == NULL) {
4175 		err = got_error_from_errno_fmt("fopen: %s",
4176 		    test_script_path);
4177 		goto done;
4178 	}
4179 
4180 	/* test mode, we don't want any output */
4181 	tog_io.cout = fopen("/dev/null", "w+");
4182 	if (tog_io.cout == NULL) {
4183 		err = got_error_from_errno("fopen: /dev/null");
4184 		goto done;
4185 	}
4186 
4187 	tog_io.cin = fopen("/dev/tty", "r+");
4188 	if (tog_io.cin == NULL) {
4189 		err = got_error_from_errno("fopen: /dev/tty");
4190 		goto done;
4191 	}
4192 
4193 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4194 		err = got_error_from_errno("fseeko");
4195 		goto done;
4196 	}
4197 
4198 	/* use local TERM so we test in different environments */
4199 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4200 		err = got_error_msg(GOT_ERR_IO,
4201 		    "newterm: failed to initialise curses");
4202 
4203 	using_mock_io = 1;
4204 done:
4205 	if (err)
4206 		tog_io_close();
4207 	return err;
4208 }
4209 
4210 static void
4211 init_curses(void)
4212 {
4213 	/*
4214 	 * Override default signal handlers before starting ncurses.
4215 	 * This should prevent ncurses from installing its own
4216 	 * broken cleanup() signal handler.
4217 	 */
4218 	signal(SIGWINCH, tog_sigwinch);
4219 	signal(SIGPIPE, tog_sigpipe);
4220 	signal(SIGCONT, tog_sigcont);
4221 	signal(SIGINT, tog_sigint);
4222 	signal(SIGTERM, tog_sigterm);
4223 
4224 	if (using_mock_io) /* In test mode we use a fake terminal */
4225 		return;
4226 
4227 	initscr();
4228 
4229 	cbreak();
4230 	halfdelay(1); /* Fast refresh while initial view is loading. */
4231 	noecho();
4232 	nonl();
4233 	intrflush(stdscr, FALSE);
4234 	keypad(stdscr, TRUE);
4235 	curs_set(0);
4236 	if (getenv("TOG_COLORS") != NULL) {
4237 		start_color();
4238 		use_default_colors();
4239 	}
4240 
4241 	return;
4242 }
4243 
4244 static const struct got_error *
4245 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4246     struct got_repository *repo, struct got_worktree *worktree)
4247 {
4248 	const struct got_error *err = NULL;
4249 
4250 	if (argc == 0) {
4251 		*in_repo_path = strdup("/");
4252 		if (*in_repo_path == NULL)
4253 			return got_error_from_errno("strdup");
4254 		return NULL;
4255 	}
4256 
4257 	if (worktree) {
4258 		const char *prefix = got_worktree_get_path_prefix(worktree);
4259 		char *p;
4260 
4261 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4262 		if (err)
4263 			return err;
4264 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4265 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4266 		    p) == -1) {
4267 			err = got_error_from_errno("asprintf");
4268 			*in_repo_path = NULL;
4269 		}
4270 		free(p);
4271 	} else
4272 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4273 
4274 	return err;
4275 }
4276 
4277 static const struct got_error *
4278 cmd_log(int argc, char *argv[])
4279 {
4280 	const struct got_error *error;
4281 	struct got_repository *repo = NULL;
4282 	struct got_worktree *worktree = NULL;
4283 	struct got_object_id *start_id = NULL;
4284 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4285 	char *start_commit = NULL, *label = NULL;
4286 	struct got_reference *ref = NULL;
4287 	const char *head_ref_name = NULL;
4288 	int ch, log_branches = 0;
4289 	struct tog_view *view;
4290 	int *pack_fds = NULL;
4291 
4292 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4293 		switch (ch) {
4294 		case 'b':
4295 			log_branches = 1;
4296 			break;
4297 		case 'c':
4298 			start_commit = optarg;
4299 			break;
4300 		case 'r':
4301 			repo_path = realpath(optarg, NULL);
4302 			if (repo_path == NULL)
4303 				return got_error_from_errno2("realpath",
4304 				    optarg);
4305 			break;
4306 		default:
4307 			usage_log();
4308 			/* NOTREACHED */
4309 		}
4310 	}
4311 
4312 	argc -= optind;
4313 	argv += optind;
4314 
4315 	if (argc > 1)
4316 		usage_log();
4317 
4318 	error = got_repo_pack_fds_open(&pack_fds);
4319 	if (error != NULL)
4320 		goto done;
4321 
4322 	if (repo_path == NULL) {
4323 		cwd = getcwd(NULL, 0);
4324 		if (cwd == NULL)
4325 			return got_error_from_errno("getcwd");
4326 		error = got_worktree_open(&worktree, cwd);
4327 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4328 			goto done;
4329 		if (worktree)
4330 			repo_path =
4331 			    strdup(got_worktree_get_repo_path(worktree));
4332 		else
4333 			repo_path = strdup(cwd);
4334 		if (repo_path == NULL) {
4335 			error = got_error_from_errno("strdup");
4336 			goto done;
4337 		}
4338 	}
4339 
4340 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4341 	if (error != NULL)
4342 		goto done;
4343 
4344 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4345 	    repo, worktree);
4346 	if (error)
4347 		goto done;
4348 
4349 	init_curses();
4350 
4351 	error = apply_unveil(got_repo_get_path(repo),
4352 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4353 	if (error)
4354 		goto done;
4355 
4356 	/* already loaded by tog_log_with_path()? */
4357 	if (TAILQ_EMPTY(&tog_refs)) {
4358 		error = tog_load_refs(repo, 0);
4359 		if (error)
4360 			goto done;
4361 	}
4362 
4363 	if (start_commit == NULL) {
4364 		error = got_repo_match_object_id(&start_id, &label,
4365 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4366 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4367 		if (error)
4368 			goto done;
4369 		head_ref_name = label;
4370 	} else {
4371 		error = got_ref_open(&ref, repo, start_commit, 0);
4372 		if (error == NULL)
4373 			head_ref_name = got_ref_get_name(ref);
4374 		else if (error->code != GOT_ERR_NOT_REF)
4375 			goto done;
4376 		error = got_repo_match_object_id(&start_id, NULL,
4377 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4378 		if (error)
4379 			goto done;
4380 	}
4381 
4382 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4383 	if (view == NULL) {
4384 		error = got_error_from_errno("view_open");
4385 		goto done;
4386 	}
4387 	error = open_log_view(view, start_id, repo, head_ref_name,
4388 	    in_repo_path, log_branches);
4389 	if (error)
4390 		goto done;
4391 	if (worktree) {
4392 		/* Release work tree lock. */
4393 		got_worktree_close(worktree);
4394 		worktree = NULL;
4395 	}
4396 	error = view_loop(view);
4397 done:
4398 	free(in_repo_path);
4399 	free(repo_path);
4400 	free(cwd);
4401 	free(start_id);
4402 	free(label);
4403 	if (ref)
4404 		got_ref_close(ref);
4405 	if (repo) {
4406 		const struct got_error *close_err = got_repo_close(repo);
4407 		if (error == NULL)
4408 			error = close_err;
4409 	}
4410 	if (worktree)
4411 		got_worktree_close(worktree);
4412 	if (pack_fds) {
4413 		const struct got_error *pack_err =
4414 		    got_repo_pack_fds_close(pack_fds);
4415 		if (error == NULL)
4416 			error = pack_err;
4417 	}
4418 	tog_free_refs();
4419 	return error;
4420 }
4421 
4422 __dead static void
4423 usage_diff(void)
4424 {
4425 	endwin();
4426 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4427 	    "object1 object2\n", getprogname());
4428 	exit(1);
4429 }
4430 
4431 static int
4432 match_line(const char *line, regex_t *regex, size_t nmatch,
4433     regmatch_t *regmatch)
4434 {
4435 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4436 }
4437 
4438 static struct tog_color *
4439 match_color(struct tog_colors *colors, const char *line)
4440 {
4441 	struct tog_color *tc = NULL;
4442 
4443 	STAILQ_FOREACH(tc, colors, entry) {
4444 		if (match_line(line, &tc->regex, 0, NULL))
4445 			return tc;
4446 	}
4447 
4448 	return NULL;
4449 }
4450 
4451 static const struct got_error *
4452 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4453     WINDOW *window, int skipcol, regmatch_t *regmatch)
4454 {
4455 	const struct got_error *err = NULL;
4456 	char *exstr = NULL;
4457 	wchar_t *wline = NULL;
4458 	int rme, rms, n, width, scrollx;
4459 	int width0 = 0, width1 = 0, width2 = 0;
4460 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4461 
4462 	*wtotal = 0;
4463 
4464 	rms = regmatch->rm_so;
4465 	rme = regmatch->rm_eo;
4466 
4467 	err = expand_tab(&exstr, line);
4468 	if (err)
4469 		return err;
4470 
4471 	/* Split the line into 3 segments, according to match offsets. */
4472 	seg0 = strndup(exstr, rms);
4473 	if (seg0 == NULL) {
4474 		err = got_error_from_errno("strndup");
4475 		goto done;
4476 	}
4477 	seg1 = strndup(exstr + rms, rme - rms);
4478 	if (seg1 == NULL) {
4479 		err = got_error_from_errno("strndup");
4480 		goto done;
4481 	}
4482 	seg2 = strdup(exstr + rme);
4483 	if (seg2 == NULL) {
4484 		err = got_error_from_errno("strndup");
4485 		goto done;
4486 	}
4487 
4488 	/* draw up to matched token if we haven't scrolled past it */
4489 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4490 	    col_tab_align, 1);
4491 	if (err)
4492 		goto done;
4493 	n = MAX(width0 - skipcol, 0);
4494 	if (n) {
4495 		free(wline);
4496 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4497 		    wlimit, col_tab_align, 1);
4498 		if (err)
4499 			goto done;
4500 		waddwstr(window, &wline[scrollx]);
4501 		wlimit -= width;
4502 		*wtotal += width;
4503 	}
4504 
4505 	if (wlimit > 0) {
4506 		int i = 0, w = 0;
4507 		size_t wlen;
4508 
4509 		free(wline);
4510 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4511 		    col_tab_align, 1);
4512 		if (err)
4513 			goto done;
4514 		wlen = wcslen(wline);
4515 		while (i < wlen) {
4516 			width = wcwidth(wline[i]);
4517 			if (width == -1) {
4518 				/* should not happen, tabs are expanded */
4519 				err = got_error(GOT_ERR_RANGE);
4520 				goto done;
4521 			}
4522 			if (width0 + w + width > skipcol)
4523 				break;
4524 			w += width;
4525 			i++;
4526 		}
4527 		/* draw (visible part of) matched token (if scrolled into it) */
4528 		if (width1 - w > 0) {
4529 			wattron(window, A_STANDOUT);
4530 			waddwstr(window, &wline[i]);
4531 			wattroff(window, A_STANDOUT);
4532 			wlimit -= (width1 - w);
4533 			*wtotal += (width1 - w);
4534 		}
4535 	}
4536 
4537 	if (wlimit > 0) {  /* draw rest of line */
4538 		free(wline);
4539 		if (skipcol > width0 + width1) {
4540 			err = format_line(&wline, &width2, &scrollx, seg2,
4541 			    skipcol - (width0 + width1), wlimit,
4542 			    col_tab_align, 1);
4543 			if (err)
4544 				goto done;
4545 			waddwstr(window, &wline[scrollx]);
4546 		} else {
4547 			err = format_line(&wline, &width2, NULL, seg2, 0,
4548 			    wlimit, col_tab_align, 1);
4549 			if (err)
4550 				goto done;
4551 			waddwstr(window, wline);
4552 		}
4553 		*wtotal += width2;
4554 	}
4555 done:
4556 	free(wline);
4557 	free(exstr);
4558 	free(seg0);
4559 	free(seg1);
4560 	free(seg2);
4561 	return err;
4562 }
4563 
4564 static int
4565 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4566 {
4567 	FILE	*f = NULL;
4568 	int	*eof, *first, *selected;
4569 
4570 	if (view->type == TOG_VIEW_DIFF) {
4571 		struct tog_diff_view_state *s = &view->state.diff;
4572 
4573 		first = &s->first_displayed_line;
4574 		selected = first;
4575 		eof = &s->eof;
4576 		f = s->f;
4577 	} else if (view->type == TOG_VIEW_HELP) {
4578 		struct tog_help_view_state *s = &view->state.help;
4579 
4580 		first = &s->first_displayed_line;
4581 		selected = first;
4582 		eof = &s->eof;
4583 		f = s->f;
4584 	} else if (view->type == TOG_VIEW_BLAME) {
4585 		struct tog_blame_view_state *s = &view->state.blame;
4586 
4587 		first = &s->first_displayed_line;
4588 		selected = &s->selected_line;
4589 		eof = &s->eof;
4590 		f = s->blame.f;
4591 	} else
4592 		return 0;
4593 
4594 	/* Center gline in the middle of the page like vi(1). */
4595 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4596 		return 0;
4597 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4598 		rewind(f);
4599 		*eof = 0;
4600 		*first = 1;
4601 		*lineno = 0;
4602 		*nprinted = 0;
4603 		return 0;
4604 	}
4605 
4606 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4607 		view->gline : (view->nlines - 3) / 2 + 1;
4608 	view->gline = 0;
4609 
4610 	return 1;
4611 }
4612 
4613 static const struct got_error *
4614 draw_file(struct tog_view *view, const char *header)
4615 {
4616 	struct tog_diff_view_state *s = &view->state.diff;
4617 	regmatch_t *regmatch = &view->regmatch;
4618 	const struct got_error *err;
4619 	int nprinted = 0;
4620 	char *line;
4621 	size_t linesize = 0;
4622 	ssize_t linelen;
4623 	wchar_t *wline;
4624 	int width;
4625 	int max_lines = view->nlines;
4626 	int nlines = s->nlines;
4627 	off_t line_offset;
4628 
4629 	s->lineno = s->first_displayed_line - 1;
4630 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4631 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4632 		return got_error_from_errno("fseek");
4633 
4634 	werase(view->window);
4635 
4636 	if (view->gline > s->nlines - 1)
4637 		view->gline = s->nlines - 1;
4638 
4639 	if (header) {
4640 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4641 		    1 : view->gline - (view->nlines - 3) / 2 :
4642 		    s->lineno + s->selected_line;
4643 
4644 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4645 			return got_error_from_errno("asprintf");
4646 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4647 		    0, 0);
4648 		free(line);
4649 		if (err)
4650 			return err;
4651 
4652 		if (view_needs_focus_indication(view))
4653 			wstandout(view->window);
4654 		waddwstr(view->window, wline);
4655 		free(wline);
4656 		wline = NULL;
4657 		while (width++ < view->ncols)
4658 			waddch(view->window, ' ');
4659 		if (view_needs_focus_indication(view))
4660 			wstandend(view->window);
4661 
4662 		if (max_lines <= 1)
4663 			return NULL;
4664 		max_lines--;
4665 	}
4666 
4667 	s->eof = 0;
4668 	view->maxx = 0;
4669 	line = NULL;
4670 	while (max_lines > 0 && nprinted < max_lines) {
4671 		enum got_diff_line_type linetype;
4672 		attr_t attr = 0;
4673 
4674 		linelen = getline(&line, &linesize, s->f);
4675 		if (linelen == -1) {
4676 			if (feof(s->f)) {
4677 				s->eof = 1;
4678 				break;
4679 			}
4680 			free(line);
4681 			return got_ferror(s->f, GOT_ERR_IO);
4682 		}
4683 
4684 		if (++s->lineno < s->first_displayed_line)
4685 			continue;
4686 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4687 			continue;
4688 		if (s->lineno == view->hiline)
4689 			attr = A_STANDOUT;
4690 
4691 		/* Set view->maxx based on full line length. */
4692 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4693 		    view->x ? 1 : 0);
4694 		if (err) {
4695 			free(line);
4696 			return err;
4697 		}
4698 		view->maxx = MAX(view->maxx, width);
4699 		free(wline);
4700 		wline = NULL;
4701 
4702 		linetype = s->lines[s->lineno].type;
4703 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4704 		    linetype < GOT_DIFF_LINE_CONTEXT)
4705 			attr |= COLOR_PAIR(linetype);
4706 		if (attr)
4707 			wattron(view->window, attr);
4708 		if (s->first_displayed_line + nprinted == s->matched_line &&
4709 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4710 			err = add_matched_line(&width, line, view->ncols, 0,
4711 			    view->window, view->x, regmatch);
4712 			if (err) {
4713 				free(line);
4714 				return err;
4715 			}
4716 		} else {
4717 			int skip;
4718 			err = format_line(&wline, &width, &skip, line,
4719 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4720 			if (err) {
4721 				free(line);
4722 				return err;
4723 			}
4724 			waddwstr(view->window, &wline[skip]);
4725 			free(wline);
4726 			wline = NULL;
4727 		}
4728 		if (s->lineno == view->hiline) {
4729 			/* highlight full gline length */
4730 			while (width++ < view->ncols)
4731 				waddch(view->window, ' ');
4732 		} else {
4733 			if (width <= view->ncols - 1)
4734 				waddch(view->window, '\n');
4735 		}
4736 		if (attr)
4737 			wattroff(view->window, attr);
4738 		if (++nprinted == 1)
4739 			s->first_displayed_line = s->lineno;
4740 	}
4741 	free(line);
4742 	if (nprinted >= 1)
4743 		s->last_displayed_line = s->first_displayed_line +
4744 		    (nprinted - 1);
4745 	else
4746 		s->last_displayed_line = s->first_displayed_line;
4747 
4748 	view_border(view);
4749 
4750 	if (s->eof) {
4751 		while (nprinted < view->nlines) {
4752 			waddch(view->window, '\n');
4753 			nprinted++;
4754 		}
4755 
4756 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4757 		    view->ncols, 0, 0);
4758 		if (err) {
4759 			return err;
4760 		}
4761 
4762 		wstandout(view->window);
4763 		waddwstr(view->window, wline);
4764 		free(wline);
4765 		wline = NULL;
4766 		wstandend(view->window);
4767 	}
4768 
4769 	return NULL;
4770 }
4771 
4772 static char *
4773 get_datestr(time_t *time, char *datebuf)
4774 {
4775 	struct tm mytm, *tm;
4776 	char *p, *s;
4777 
4778 	tm = gmtime_r(time, &mytm);
4779 	if (tm == NULL)
4780 		return NULL;
4781 	s = asctime_r(tm, datebuf);
4782 	if (s == NULL)
4783 		return NULL;
4784 	p = strchr(s, '\n');
4785 	if (p)
4786 		*p = '\0';
4787 	return s;
4788 }
4789 
4790 static const struct got_error *
4791 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4792     off_t off, uint8_t type)
4793 {
4794 	struct got_diff_line *p;
4795 
4796 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4797 	if (p == NULL)
4798 		return got_error_from_errno("reallocarray");
4799 	*lines = p;
4800 	(*lines)[*nlines].offset = off;
4801 	(*lines)[*nlines].type = type;
4802 	(*nlines)++;
4803 
4804 	return NULL;
4805 }
4806 
4807 static const struct got_error *
4808 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4809     struct got_diff_line *s_lines, size_t s_nlines)
4810 {
4811 	struct got_diff_line	*p;
4812 	char			 buf[BUFSIZ];
4813 	size_t			 i, r;
4814 
4815 	if (fseeko(src, 0L, SEEK_SET) == -1)
4816 		return got_error_from_errno("fseeko");
4817 
4818 	for (;;) {
4819 		r = fread(buf, 1, sizeof(buf), src);
4820 		if (r == 0) {
4821 			if (ferror(src))
4822 				return got_error_from_errno("fread");
4823 			if (feof(src))
4824 				break;
4825 		}
4826 		if (fwrite(buf, 1, r, dst) != r)
4827 			return got_ferror(dst, GOT_ERR_IO);
4828 	}
4829 
4830 	if (s_nlines == 0 && *d_nlines == 0)
4831 		return NULL;
4832 
4833 	/*
4834 	 * If commit info was in dst, increment line offsets
4835 	 * of the appended diff content, but skip s_lines[0]
4836 	 * because offset zero is already in *d_lines.
4837 	 */
4838 	if (*d_nlines > 0) {
4839 		for (i = 1; i < s_nlines; ++i)
4840 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4841 
4842 		if (s_nlines > 0) {
4843 			--s_nlines;
4844 			++s_lines;
4845 		}
4846 	}
4847 
4848 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4849 	if (p == NULL) {
4850 		/* d_lines is freed in close_diff_view() */
4851 		return got_error_from_errno("reallocarray");
4852 	}
4853 
4854 	*d_lines = p;
4855 
4856 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4857 	*d_nlines += s_nlines;
4858 
4859 	return NULL;
4860 }
4861 
4862 static const struct got_error *
4863 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4864     struct got_object_id *commit_id, struct got_reflist_head *refs,
4865     struct got_repository *repo, int ignore_ws, int force_text_diff,
4866     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4867 {
4868 	const struct got_error *err = NULL;
4869 	char datebuf[26], *datestr;
4870 	struct got_commit_object *commit;
4871 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4872 	time_t committer_time;
4873 	const char *author, *committer;
4874 	char *refs_str = NULL;
4875 	struct got_pathlist_entry *pe;
4876 	off_t outoff = 0;
4877 	int n;
4878 
4879 	if (refs) {
4880 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4881 		if (err)
4882 			return err;
4883 	}
4884 
4885 	err = got_object_open_as_commit(&commit, repo, commit_id);
4886 	if (err)
4887 		return err;
4888 
4889 	err = got_object_id_str(&id_str, commit_id);
4890 	if (err) {
4891 		err = got_error_from_errno("got_object_id_str");
4892 		goto done;
4893 	}
4894 
4895 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4896 	if (err)
4897 		goto done;
4898 
4899 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4900 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4901 	if (n < 0) {
4902 		err = got_error_from_errno("fprintf");
4903 		goto done;
4904 	}
4905 	outoff += n;
4906 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4907 	if (err)
4908 		goto done;
4909 
4910 	n = fprintf(outfile, "from: %s\n",
4911 	    got_object_commit_get_author(commit));
4912 	if (n < 0) {
4913 		err = got_error_from_errno("fprintf");
4914 		goto done;
4915 	}
4916 	outoff += n;
4917 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4918 	if (err)
4919 		goto done;
4920 
4921 	author = got_object_commit_get_author(commit);
4922 	committer = got_object_commit_get_committer(commit);
4923 	if (strcmp(author, committer) != 0) {
4924 		n = fprintf(outfile, "via: %s\n", committer);
4925 		if (n < 0) {
4926 			err = got_error_from_errno("fprintf");
4927 			goto done;
4928 		}
4929 		outoff += n;
4930 		err = add_line_metadata(lines, nlines, outoff,
4931 		    GOT_DIFF_LINE_AUTHOR);
4932 		if (err)
4933 			goto done;
4934 	}
4935 	committer_time = got_object_commit_get_committer_time(commit);
4936 	datestr = get_datestr(&committer_time, datebuf);
4937 	if (datestr) {
4938 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4939 		if (n < 0) {
4940 			err = got_error_from_errno("fprintf");
4941 			goto done;
4942 		}
4943 		outoff += n;
4944 		err = add_line_metadata(lines, nlines, outoff,
4945 		    GOT_DIFF_LINE_DATE);
4946 		if (err)
4947 			goto done;
4948 	}
4949 	if (got_object_commit_get_nparents(commit) > 1) {
4950 		const struct got_object_id_queue *parent_ids;
4951 		struct got_object_qid *qid;
4952 		int pn = 1;
4953 		parent_ids = got_object_commit_get_parent_ids(commit);
4954 		STAILQ_FOREACH(qid, parent_ids, entry) {
4955 			err = got_object_id_str(&id_str, &qid->id);
4956 			if (err)
4957 				goto done;
4958 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4959 			if (n < 0) {
4960 				err = got_error_from_errno("fprintf");
4961 				goto done;
4962 			}
4963 			outoff += n;
4964 			err = add_line_metadata(lines, nlines, outoff,
4965 			    GOT_DIFF_LINE_META);
4966 			if (err)
4967 				goto done;
4968 			free(id_str);
4969 			id_str = NULL;
4970 		}
4971 	}
4972 
4973 	err = got_object_commit_get_logmsg(&logmsg, commit);
4974 	if (err)
4975 		goto done;
4976 	s = logmsg;
4977 	while ((line = strsep(&s, "\n")) != NULL) {
4978 		n = fprintf(outfile, "%s\n", line);
4979 		if (n < 0) {
4980 			err = got_error_from_errno("fprintf");
4981 			goto done;
4982 		}
4983 		outoff += n;
4984 		err = add_line_metadata(lines, nlines, outoff,
4985 		    GOT_DIFF_LINE_LOGMSG);
4986 		if (err)
4987 			goto done;
4988 	}
4989 
4990 	TAILQ_FOREACH(pe, dsa->paths, entry) {
4991 		struct got_diff_changed_path *cp = pe->data;
4992 		int pad = dsa->max_path_len - pe->path_len + 1;
4993 
4994 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4995 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
4996 		    dsa->rm_cols + 1, cp->rm);
4997 		if (n < 0) {
4998 			err = got_error_from_errno("fprintf");
4999 			goto done;
5000 		}
5001 		outoff += n;
5002 		err = add_line_metadata(lines, nlines, outoff,
5003 		    GOT_DIFF_LINE_CHANGES);
5004 		if (err)
5005 			goto done;
5006 	}
5007 
5008 	fputc('\n', outfile);
5009 	outoff++;
5010 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5011 	if (err)
5012 		goto done;
5013 
5014 	n = fprintf(outfile,
5015 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5016 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5017 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5018 	if (n < 0) {
5019 		err = got_error_from_errno("fprintf");
5020 		goto done;
5021 	}
5022 	outoff += n;
5023 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5024 	if (err)
5025 		goto done;
5026 
5027 	fputc('\n', outfile);
5028 	outoff++;
5029 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5030 done:
5031 	free(id_str);
5032 	free(logmsg);
5033 	free(refs_str);
5034 	got_object_commit_close(commit);
5035 	if (err) {
5036 		free(*lines);
5037 		*lines = NULL;
5038 		*nlines = 0;
5039 	}
5040 	return err;
5041 }
5042 
5043 static const struct got_error *
5044 create_diff(struct tog_diff_view_state *s)
5045 {
5046 	const struct got_error *err = NULL;
5047 	FILE *f = NULL, *tmp_diff_file = NULL;
5048 	int obj_type;
5049 	struct got_diff_line *lines = NULL;
5050 	struct got_pathlist_head changed_paths;
5051 
5052 	TAILQ_INIT(&changed_paths);
5053 
5054 	free(s->lines);
5055 	s->lines = malloc(sizeof(*s->lines));
5056 	if (s->lines == NULL)
5057 		return got_error_from_errno("malloc");
5058 	s->nlines = 0;
5059 
5060 	f = got_opentemp();
5061 	if (f == NULL) {
5062 		err = got_error_from_errno("got_opentemp");
5063 		goto done;
5064 	}
5065 	tmp_diff_file = got_opentemp();
5066 	if (tmp_diff_file == NULL) {
5067 		err = got_error_from_errno("got_opentemp");
5068 		goto done;
5069 	}
5070 	if (s->f && fclose(s->f) == EOF) {
5071 		err = got_error_from_errno("fclose");
5072 		goto done;
5073 	}
5074 	s->f = f;
5075 
5076 	if (s->id1)
5077 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5078 	else
5079 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5080 	if (err)
5081 		goto done;
5082 
5083 	switch (obj_type) {
5084 	case GOT_OBJ_TYPE_BLOB:
5085 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5086 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5087 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5088 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5089 		    s->f);
5090 		break;
5091 	case GOT_OBJ_TYPE_TREE:
5092 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5093 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5094 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5095 		    s->force_text_diff, NULL, s->repo, s->f);
5096 		break;
5097 	case GOT_OBJ_TYPE_COMMIT: {
5098 		const struct got_object_id_queue *parent_ids;
5099 		struct got_object_qid *pid;
5100 		struct got_commit_object *commit2;
5101 		struct got_reflist_head *refs;
5102 		size_t nlines = 0;
5103 		struct got_diffstat_cb_arg dsa = {
5104 			0, 0, 0, 0, 0, 0,
5105 			&changed_paths,
5106 			s->ignore_whitespace,
5107 			s->force_text_diff,
5108 			tog_diff_algo
5109 		};
5110 
5111 		lines = malloc(sizeof(*lines));
5112 		if (lines == NULL) {
5113 			err = got_error_from_errno("malloc");
5114 			goto done;
5115 		}
5116 
5117 		/* build diff first in tmp file then append to commit info */
5118 		err = got_diff_objects_as_commits(&lines, &nlines,
5119 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5120 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5121 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5122 		if (err)
5123 			break;
5124 
5125 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5126 		if (err)
5127 			goto done;
5128 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5129 		/* Show commit info if we're diffing to a parent/root commit. */
5130 		if (s->id1 == NULL) {
5131 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5132 			    refs, s->repo, s->ignore_whitespace,
5133 			    s->force_text_diff, &dsa, s->f);
5134 			if (err)
5135 				goto done;
5136 		} else {
5137 			parent_ids = got_object_commit_get_parent_ids(commit2);
5138 			STAILQ_FOREACH(pid, parent_ids, entry) {
5139 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5140 					err = write_commit_info(&s->lines,
5141 					    &s->nlines, s->id2, refs, s->repo,
5142 					    s->ignore_whitespace,
5143 					    s->force_text_diff, &dsa, s->f);
5144 					if (err)
5145 						goto done;
5146 					break;
5147 				}
5148 			}
5149 		}
5150 		got_object_commit_close(commit2);
5151 
5152 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5153 		    lines, nlines);
5154 		break;
5155 	}
5156 	default:
5157 		err = got_error(GOT_ERR_OBJ_TYPE);
5158 		break;
5159 	}
5160 done:
5161 	free(lines);
5162 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5163 	if (s->f && fflush(s->f) != 0 && err == NULL)
5164 		err = got_error_from_errno("fflush");
5165 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5166 		err = got_error_from_errno("fclose");
5167 	return err;
5168 }
5169 
5170 static void
5171 diff_view_indicate_progress(struct tog_view *view)
5172 {
5173 	mvwaddstr(view->window, 0, 0, "diffing...");
5174 	update_panels();
5175 	doupdate();
5176 }
5177 
5178 static const struct got_error *
5179 search_start_diff_view(struct tog_view *view)
5180 {
5181 	struct tog_diff_view_state *s = &view->state.diff;
5182 
5183 	s->matched_line = 0;
5184 	return NULL;
5185 }
5186 
5187 static void
5188 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5189     size_t *nlines, int **first, int **last, int **match, int **selected)
5190 {
5191 	struct tog_diff_view_state *s = &view->state.diff;
5192 
5193 	*f = s->f;
5194 	*nlines = s->nlines;
5195 	*line_offsets = NULL;
5196 	*match = &s->matched_line;
5197 	*first = &s->first_displayed_line;
5198 	*last = &s->last_displayed_line;
5199 	*selected = &s->selected_line;
5200 }
5201 
5202 static const struct got_error *
5203 search_next_view_match(struct tog_view *view)
5204 {
5205 	const struct got_error *err = NULL;
5206 	FILE *f;
5207 	int lineno;
5208 	char *line = NULL;
5209 	size_t linesize = 0;
5210 	ssize_t linelen;
5211 	off_t *line_offsets;
5212 	size_t nlines = 0;
5213 	int *first, *last, *match, *selected;
5214 
5215 	if (!view->search_setup)
5216 		return got_error_msg(GOT_ERR_NOT_IMPL,
5217 		    "view search not supported");
5218 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5219 	    &match, &selected);
5220 
5221 	if (!view->searching) {
5222 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5223 		return NULL;
5224 	}
5225 
5226 	if (*match) {
5227 		if (view->searching == TOG_SEARCH_FORWARD)
5228 			lineno = *first + 1;
5229 		else
5230 			lineno = *first - 1;
5231 	} else
5232 		lineno = *first - 1 + *selected;
5233 
5234 	while (1) {
5235 		off_t offset;
5236 
5237 		if (lineno <= 0 || lineno > nlines) {
5238 			if (*match == 0) {
5239 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5240 				break;
5241 			}
5242 
5243 			if (view->searching == TOG_SEARCH_FORWARD)
5244 				lineno = 1;
5245 			else
5246 				lineno = nlines;
5247 		}
5248 
5249 		offset = view->type == TOG_VIEW_DIFF ?
5250 		    view->state.diff.lines[lineno - 1].offset :
5251 		    line_offsets[lineno - 1];
5252 		if (fseeko(f, offset, SEEK_SET) != 0) {
5253 			free(line);
5254 			return got_error_from_errno("fseeko");
5255 		}
5256 		linelen = getline(&line, &linesize, f);
5257 		if (linelen != -1) {
5258 			char *exstr;
5259 			err = expand_tab(&exstr, line);
5260 			if (err)
5261 				break;
5262 			if (match_line(exstr, &view->regex, 1,
5263 			    &view->regmatch)) {
5264 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5265 				*match = lineno;
5266 				free(exstr);
5267 				break;
5268 			}
5269 			free(exstr);
5270 		}
5271 		if (view->searching == TOG_SEARCH_FORWARD)
5272 			lineno++;
5273 		else
5274 			lineno--;
5275 	}
5276 	free(line);
5277 
5278 	if (*match) {
5279 		*first = *match;
5280 		*selected = 1;
5281 	}
5282 
5283 	return err;
5284 }
5285 
5286 static const struct got_error *
5287 close_diff_view(struct tog_view *view)
5288 {
5289 	const struct got_error *err = NULL;
5290 	struct tog_diff_view_state *s = &view->state.diff;
5291 
5292 	free(s->id1);
5293 	s->id1 = NULL;
5294 	free(s->id2);
5295 	s->id2 = NULL;
5296 	if (s->f && fclose(s->f) == EOF)
5297 		err = got_error_from_errno("fclose");
5298 	s->f = NULL;
5299 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5300 		err = got_error_from_errno("fclose");
5301 	s->f1 = NULL;
5302 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5303 		err = got_error_from_errno("fclose");
5304 	s->f2 = NULL;
5305 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5306 		err = got_error_from_errno("close");
5307 	s->fd1 = -1;
5308 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5309 		err = got_error_from_errno("close");
5310 	s->fd2 = -1;
5311 	free(s->lines);
5312 	s->lines = NULL;
5313 	s->nlines = 0;
5314 	return err;
5315 }
5316 
5317 static const struct got_error *
5318 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5319     struct got_object_id *id2, const char *label1, const char *label2,
5320     int diff_context, int ignore_whitespace, int force_text_diff,
5321     struct tog_view *parent_view, struct got_repository *repo)
5322 {
5323 	const struct got_error *err;
5324 	struct tog_diff_view_state *s = &view->state.diff;
5325 
5326 	memset(s, 0, sizeof(*s));
5327 	s->fd1 = -1;
5328 	s->fd2 = -1;
5329 
5330 	if (id1 != NULL && id2 != NULL) {
5331 		int type1, type2;
5332 
5333 		err = got_object_get_type(&type1, repo, id1);
5334 		if (err)
5335 			goto done;
5336 		err = got_object_get_type(&type2, repo, id2);
5337 		if (err)
5338 			goto done;
5339 
5340 		if (type1 != type2) {
5341 			err = got_error(GOT_ERR_OBJ_TYPE);
5342 			goto done;
5343 		}
5344 	}
5345 	s->first_displayed_line = 1;
5346 	s->last_displayed_line = view->nlines;
5347 	s->selected_line = 1;
5348 	s->repo = repo;
5349 	s->id1 = id1;
5350 	s->id2 = id2;
5351 	s->label1 = label1;
5352 	s->label2 = label2;
5353 
5354 	if (id1) {
5355 		s->id1 = got_object_id_dup(id1);
5356 		if (s->id1 == NULL) {
5357 			err = got_error_from_errno("got_object_id_dup");
5358 			goto done;
5359 		}
5360 	} else
5361 		s->id1 = NULL;
5362 
5363 	s->id2 = got_object_id_dup(id2);
5364 	if (s->id2 == NULL) {
5365 		err = got_error_from_errno("got_object_id_dup");
5366 		goto done;
5367 	}
5368 
5369 	s->f1 = got_opentemp();
5370 	if (s->f1 == NULL) {
5371 		err = got_error_from_errno("got_opentemp");
5372 		goto done;
5373 	}
5374 
5375 	s->f2 = got_opentemp();
5376 	if (s->f2 == NULL) {
5377 		err = got_error_from_errno("got_opentemp");
5378 		goto done;
5379 	}
5380 
5381 	s->fd1 = got_opentempfd();
5382 	if (s->fd1 == -1) {
5383 		err = got_error_from_errno("got_opentempfd");
5384 		goto done;
5385 	}
5386 
5387 	s->fd2 = got_opentempfd();
5388 	if (s->fd2 == -1) {
5389 		err = got_error_from_errno("got_opentempfd");
5390 		goto done;
5391 	}
5392 
5393 	s->diff_context = diff_context;
5394 	s->ignore_whitespace = ignore_whitespace;
5395 	s->force_text_diff = force_text_diff;
5396 	s->parent_view = parent_view;
5397 	s->repo = repo;
5398 
5399 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5400 		int rc;
5401 
5402 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5403 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5404 		if (rc != ERR)
5405 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5406 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5407 		if (rc != ERR)
5408 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5409 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5410 		if (rc != ERR)
5411 			rc = init_pair(GOT_DIFF_LINE_META,
5412 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5413 		if (rc != ERR)
5414 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5415 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5416 		if (rc != ERR)
5417 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5418 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5419 		if (rc != ERR)
5420 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5421 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5422 		if (rc != ERR)
5423 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5424 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5425 		if (rc != ERR)
5426 			rc = init_pair(GOT_DIFF_LINE_DATE,
5427 			    get_color_value("TOG_COLOR_DATE"), -1);
5428 		if (rc == ERR) {
5429 			err = got_error(GOT_ERR_RANGE);
5430 			goto done;
5431 		}
5432 	}
5433 
5434 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5435 	    view_is_splitscreen(view))
5436 		show_log_view(parent_view); /* draw border */
5437 	diff_view_indicate_progress(view);
5438 
5439 	err = create_diff(s);
5440 
5441 	view->show = show_diff_view;
5442 	view->input = input_diff_view;
5443 	view->reset = reset_diff_view;
5444 	view->close = close_diff_view;
5445 	view->search_start = search_start_diff_view;
5446 	view->search_setup = search_setup_diff_view;
5447 	view->search_next = search_next_view_match;
5448 done:
5449 	if (err) {
5450 		if (view->close == NULL)
5451 			close_diff_view(view);
5452 		view_close(view);
5453 	}
5454 	return err;
5455 }
5456 
5457 static const struct got_error *
5458 show_diff_view(struct tog_view *view)
5459 {
5460 	const struct got_error *err;
5461 	struct tog_diff_view_state *s = &view->state.diff;
5462 	char *id_str1 = NULL, *id_str2, *header;
5463 	const char *label1, *label2;
5464 
5465 	if (s->id1) {
5466 		err = got_object_id_str(&id_str1, s->id1);
5467 		if (err)
5468 			return err;
5469 		label1 = s->label1 ? s->label1 : id_str1;
5470 	} else
5471 		label1 = "/dev/null";
5472 
5473 	err = got_object_id_str(&id_str2, s->id2);
5474 	if (err)
5475 		return err;
5476 	label2 = s->label2 ? s->label2 : id_str2;
5477 
5478 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5479 		err = got_error_from_errno("asprintf");
5480 		free(id_str1);
5481 		free(id_str2);
5482 		return err;
5483 	}
5484 	free(id_str1);
5485 	free(id_str2);
5486 
5487 	err = draw_file(view, header);
5488 	free(header);
5489 	return err;
5490 }
5491 
5492 static const struct got_error *
5493 set_selected_commit(struct tog_diff_view_state *s,
5494     struct commit_queue_entry *entry)
5495 {
5496 	const struct got_error *err;
5497 	const struct got_object_id_queue *parent_ids;
5498 	struct got_commit_object *selected_commit;
5499 	struct got_object_qid *pid;
5500 
5501 	free(s->id2);
5502 	s->id2 = got_object_id_dup(entry->id);
5503 	if (s->id2 == NULL)
5504 		return got_error_from_errno("got_object_id_dup");
5505 
5506 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5507 	if (err)
5508 		return err;
5509 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5510 	free(s->id1);
5511 	pid = STAILQ_FIRST(parent_ids);
5512 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5513 	got_object_commit_close(selected_commit);
5514 	return NULL;
5515 }
5516 
5517 static const struct got_error *
5518 reset_diff_view(struct tog_view *view)
5519 {
5520 	struct tog_diff_view_state *s = &view->state.diff;
5521 
5522 	view->count = 0;
5523 	wclear(view->window);
5524 	s->first_displayed_line = 1;
5525 	s->last_displayed_line = view->nlines;
5526 	s->matched_line = 0;
5527 	diff_view_indicate_progress(view);
5528 	return create_diff(s);
5529 }
5530 
5531 static void
5532 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5533 {
5534 	int start, i;
5535 
5536 	i = start = s->first_displayed_line - 1;
5537 
5538 	while (s->lines[i].type != type) {
5539 		if (i == 0)
5540 			i = s->nlines - 1;
5541 		if (--i == start)
5542 			return; /* do nothing, requested type not in file */
5543 	}
5544 
5545 	s->selected_line = 1;
5546 	s->first_displayed_line = i;
5547 }
5548 
5549 static void
5550 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5551 {
5552 	int start, i;
5553 
5554 	i = start = s->first_displayed_line + 1;
5555 
5556 	while (s->lines[i].type != type) {
5557 		if (i == s->nlines - 1)
5558 			i = 0;
5559 		if (++i == start)
5560 			return; /* do nothing, requested type not in file */
5561 	}
5562 
5563 	s->selected_line = 1;
5564 	s->first_displayed_line = i;
5565 }
5566 
5567 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5568     int, int, int);
5569 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5570     int, int);
5571 
5572 static const struct got_error *
5573 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5574 {
5575 	const struct got_error *err = NULL;
5576 	struct tog_diff_view_state *s = &view->state.diff;
5577 	struct tog_log_view_state *ls;
5578 	struct commit_queue_entry *old_selected_entry;
5579 	char *line = NULL;
5580 	size_t linesize = 0;
5581 	ssize_t linelen;
5582 	int i, nscroll = view->nlines - 1, up = 0;
5583 
5584 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5585 
5586 	switch (ch) {
5587 	case '0':
5588 	case '$':
5589 	case KEY_RIGHT:
5590 	case 'l':
5591 	case KEY_LEFT:
5592 	case 'h':
5593 		horizontal_scroll_input(view, ch);
5594 		break;
5595 	case 'a':
5596 	case 'w':
5597 		if (ch == 'a') {
5598 			s->force_text_diff = !s->force_text_diff;
5599 			view->action = s->force_text_diff ?
5600 			    "force ASCII text enabled" :
5601 			    "force ASCII text disabled";
5602 		}
5603 		else if (ch == 'w') {
5604 			s->ignore_whitespace = !s->ignore_whitespace;
5605 			view->action = s->ignore_whitespace ?
5606 			    "ignore whitespace enabled" :
5607 			    "ignore whitespace disabled";
5608 		}
5609 		err = reset_diff_view(view);
5610 		break;
5611 	case 'g':
5612 	case KEY_HOME:
5613 		s->first_displayed_line = 1;
5614 		view->count = 0;
5615 		break;
5616 	case 'G':
5617 	case KEY_END:
5618 		view->count = 0;
5619 		if (s->eof)
5620 			break;
5621 
5622 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5623 		s->eof = 1;
5624 		break;
5625 	case 'k':
5626 	case KEY_UP:
5627 	case CTRL('p'):
5628 		if (s->first_displayed_line > 1)
5629 			s->first_displayed_line--;
5630 		else
5631 			view->count = 0;
5632 		break;
5633 	case CTRL('u'):
5634 	case 'u':
5635 		nscroll /= 2;
5636 		/* FALL THROUGH */
5637 	case KEY_PPAGE:
5638 	case CTRL('b'):
5639 	case 'b':
5640 		if (s->first_displayed_line == 1) {
5641 			view->count = 0;
5642 			break;
5643 		}
5644 		i = 0;
5645 		while (i++ < nscroll && s->first_displayed_line > 1)
5646 			s->first_displayed_line--;
5647 		break;
5648 	case 'j':
5649 	case KEY_DOWN:
5650 	case CTRL('n'):
5651 		if (!s->eof)
5652 			s->first_displayed_line++;
5653 		else
5654 			view->count = 0;
5655 		break;
5656 	case CTRL('d'):
5657 	case 'd':
5658 		nscroll /= 2;
5659 		/* FALL THROUGH */
5660 	case KEY_NPAGE:
5661 	case CTRL('f'):
5662 	case 'f':
5663 	case ' ':
5664 		if (s->eof) {
5665 			view->count = 0;
5666 			break;
5667 		}
5668 		i = 0;
5669 		while (!s->eof && i++ < nscroll) {
5670 			linelen = getline(&line, &linesize, s->f);
5671 			s->first_displayed_line++;
5672 			if (linelen == -1) {
5673 				if (feof(s->f)) {
5674 					s->eof = 1;
5675 				} else
5676 					err = got_ferror(s->f, GOT_ERR_IO);
5677 				break;
5678 			}
5679 		}
5680 		free(line);
5681 		break;
5682 	case '(':
5683 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5684 		break;
5685 	case ')':
5686 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5687 		break;
5688 	case '{':
5689 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5690 		break;
5691 	case '}':
5692 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5693 		break;
5694 	case '[':
5695 		if (s->diff_context > 0) {
5696 			s->diff_context--;
5697 			s->matched_line = 0;
5698 			diff_view_indicate_progress(view);
5699 			err = create_diff(s);
5700 			if (s->first_displayed_line + view->nlines - 1 >
5701 			    s->nlines) {
5702 				s->first_displayed_line = 1;
5703 				s->last_displayed_line = view->nlines;
5704 			}
5705 		} else
5706 			view->count = 0;
5707 		break;
5708 	case ']':
5709 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5710 			s->diff_context++;
5711 			s->matched_line = 0;
5712 			diff_view_indicate_progress(view);
5713 			err = create_diff(s);
5714 		} else
5715 			view->count = 0;
5716 		break;
5717 	case '<':
5718 	case ',':
5719 	case 'K':
5720 		up = 1;
5721 		/* FALL THROUGH */
5722 	case '>':
5723 	case '.':
5724 	case 'J':
5725 		if (s->parent_view == NULL) {
5726 			view->count = 0;
5727 			break;
5728 		}
5729 		s->parent_view->count = view->count;
5730 
5731 		if (s->parent_view->type == TOG_VIEW_LOG) {
5732 			ls = &s->parent_view->state.log;
5733 			old_selected_entry = ls->selected_entry;
5734 
5735 			err = input_log_view(NULL, s->parent_view,
5736 			    up ? KEY_UP : KEY_DOWN);
5737 			if (err)
5738 				break;
5739 			view->count = s->parent_view->count;
5740 
5741 			if (old_selected_entry == ls->selected_entry)
5742 				break;
5743 
5744 			err = set_selected_commit(s, ls->selected_entry);
5745 			if (err)
5746 				break;
5747 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5748 			struct tog_blame_view_state *bs;
5749 			struct got_object_id *id, *prev_id;
5750 
5751 			bs = &s->parent_view->state.blame;
5752 			prev_id = get_annotation_for_line(bs->blame.lines,
5753 			    bs->blame.nlines, bs->last_diffed_line);
5754 
5755 			err = input_blame_view(&view, s->parent_view,
5756 			    up ? KEY_UP : KEY_DOWN);
5757 			if (err)
5758 				break;
5759 			view->count = s->parent_view->count;
5760 
5761 			if (prev_id == NULL)
5762 				break;
5763 			id = get_selected_commit_id(bs->blame.lines,
5764 			    bs->blame.nlines, bs->first_displayed_line,
5765 			    bs->selected_line);
5766 			if (id == NULL)
5767 				break;
5768 
5769 			if (!got_object_id_cmp(prev_id, id))
5770 				break;
5771 
5772 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5773 			if (err)
5774 				break;
5775 		}
5776 		s->first_displayed_line = 1;
5777 		s->last_displayed_line = view->nlines;
5778 		s->matched_line = 0;
5779 		view->x = 0;
5780 
5781 		diff_view_indicate_progress(view);
5782 		err = create_diff(s);
5783 		break;
5784 	default:
5785 		view->count = 0;
5786 		break;
5787 	}
5788 
5789 	return err;
5790 }
5791 
5792 static const struct got_error *
5793 cmd_diff(int argc, char *argv[])
5794 {
5795 	const struct got_error *error;
5796 	struct got_repository *repo = NULL;
5797 	struct got_worktree *worktree = NULL;
5798 	struct got_object_id *id1 = NULL, *id2 = NULL;
5799 	char *repo_path = NULL, *cwd = NULL;
5800 	char *id_str1 = NULL, *id_str2 = NULL;
5801 	char *label1 = NULL, *label2 = NULL;
5802 	int diff_context = 3, ignore_whitespace = 0;
5803 	int ch, force_text_diff = 0;
5804 	const char *errstr;
5805 	struct tog_view *view;
5806 	int *pack_fds = NULL;
5807 
5808 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5809 		switch (ch) {
5810 		case 'a':
5811 			force_text_diff = 1;
5812 			break;
5813 		case 'C':
5814 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5815 			    &errstr);
5816 			if (errstr != NULL)
5817 				errx(1, "number of context lines is %s: %s",
5818 				    errstr, errstr);
5819 			break;
5820 		case 'r':
5821 			repo_path = realpath(optarg, NULL);
5822 			if (repo_path == NULL)
5823 				return got_error_from_errno2("realpath",
5824 				    optarg);
5825 			got_path_strip_trailing_slashes(repo_path);
5826 			break;
5827 		case 'w':
5828 			ignore_whitespace = 1;
5829 			break;
5830 		default:
5831 			usage_diff();
5832 			/* NOTREACHED */
5833 		}
5834 	}
5835 
5836 	argc -= optind;
5837 	argv += optind;
5838 
5839 	if (argc == 0) {
5840 		usage_diff(); /* TODO show local worktree changes */
5841 	} else if (argc == 2) {
5842 		id_str1 = argv[0];
5843 		id_str2 = argv[1];
5844 	} else
5845 		usage_diff();
5846 
5847 	error = got_repo_pack_fds_open(&pack_fds);
5848 	if (error)
5849 		goto done;
5850 
5851 	if (repo_path == NULL) {
5852 		cwd = getcwd(NULL, 0);
5853 		if (cwd == NULL)
5854 			return got_error_from_errno("getcwd");
5855 		error = got_worktree_open(&worktree, cwd);
5856 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5857 			goto done;
5858 		if (worktree)
5859 			repo_path =
5860 			    strdup(got_worktree_get_repo_path(worktree));
5861 		else
5862 			repo_path = strdup(cwd);
5863 		if (repo_path == NULL) {
5864 			error = got_error_from_errno("strdup");
5865 			goto done;
5866 		}
5867 	}
5868 
5869 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5870 	if (error)
5871 		goto done;
5872 
5873 	init_curses();
5874 
5875 	error = apply_unveil(got_repo_get_path(repo), NULL);
5876 	if (error)
5877 		goto done;
5878 
5879 	error = tog_load_refs(repo, 0);
5880 	if (error)
5881 		goto done;
5882 
5883 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5884 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5885 	if (error)
5886 		goto done;
5887 
5888 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5889 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5890 	if (error)
5891 		goto done;
5892 
5893 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5894 	if (view == NULL) {
5895 		error = got_error_from_errno("view_open");
5896 		goto done;
5897 	}
5898 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5899 	    ignore_whitespace, force_text_diff, NULL,  repo);
5900 	if (error)
5901 		goto done;
5902 	error = view_loop(view);
5903 done:
5904 	free(label1);
5905 	free(label2);
5906 	free(repo_path);
5907 	free(cwd);
5908 	if (repo) {
5909 		const struct got_error *close_err = got_repo_close(repo);
5910 		if (error == NULL)
5911 			error = close_err;
5912 	}
5913 	if (worktree)
5914 		got_worktree_close(worktree);
5915 	if (pack_fds) {
5916 		const struct got_error *pack_err =
5917 		    got_repo_pack_fds_close(pack_fds);
5918 		if (error == NULL)
5919 			error = pack_err;
5920 	}
5921 	tog_free_refs();
5922 	return error;
5923 }
5924 
5925 __dead static void
5926 usage_blame(void)
5927 {
5928 	endwin();
5929 	fprintf(stderr,
5930 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5931 	    getprogname());
5932 	exit(1);
5933 }
5934 
5935 struct tog_blame_line {
5936 	int annotated;
5937 	struct got_object_id *id;
5938 };
5939 
5940 static const struct got_error *
5941 draw_blame(struct tog_view *view)
5942 {
5943 	struct tog_blame_view_state *s = &view->state.blame;
5944 	struct tog_blame *blame = &s->blame;
5945 	regmatch_t *regmatch = &view->regmatch;
5946 	const struct got_error *err;
5947 	int lineno = 0, nprinted = 0;
5948 	char *line = NULL;
5949 	size_t linesize = 0;
5950 	ssize_t linelen;
5951 	wchar_t *wline;
5952 	int width;
5953 	struct tog_blame_line *blame_line;
5954 	struct got_object_id *prev_id = NULL;
5955 	char *id_str;
5956 	struct tog_color *tc;
5957 
5958 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5959 	if (err)
5960 		return err;
5961 
5962 	rewind(blame->f);
5963 	werase(view->window);
5964 
5965 	if (asprintf(&line, "commit %s", id_str) == -1) {
5966 		err = got_error_from_errno("asprintf");
5967 		free(id_str);
5968 		return err;
5969 	}
5970 
5971 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5972 	free(line);
5973 	line = NULL;
5974 	if (err)
5975 		return err;
5976 	if (view_needs_focus_indication(view))
5977 		wstandout(view->window);
5978 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5979 	if (tc)
5980 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5981 	waddwstr(view->window, wline);
5982 	while (width++ < view->ncols)
5983 		waddch(view->window, ' ');
5984 	if (tc)
5985 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5986 	if (view_needs_focus_indication(view))
5987 		wstandend(view->window);
5988 	free(wline);
5989 	wline = NULL;
5990 
5991 	if (view->gline > blame->nlines)
5992 		view->gline = blame->nlines;
5993 
5994 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5995 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5996 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5997 		free(id_str);
5998 		return got_error_from_errno("asprintf");
5999 	}
6000 	free(id_str);
6001 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6002 	free(line);
6003 	line = NULL;
6004 	if (err)
6005 		return err;
6006 	waddwstr(view->window, wline);
6007 	free(wline);
6008 	wline = NULL;
6009 	if (width < view->ncols - 1)
6010 		waddch(view->window, '\n');
6011 
6012 	s->eof = 0;
6013 	view->maxx = 0;
6014 	while (nprinted < view->nlines - 2) {
6015 		linelen = getline(&line, &linesize, blame->f);
6016 		if (linelen == -1) {
6017 			if (feof(blame->f)) {
6018 				s->eof = 1;
6019 				break;
6020 			}
6021 			free(line);
6022 			return got_ferror(blame->f, GOT_ERR_IO);
6023 		}
6024 		if (++lineno < s->first_displayed_line)
6025 			continue;
6026 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6027 			continue;
6028 
6029 		/* Set view->maxx based on full line length. */
6030 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6031 		if (err) {
6032 			free(line);
6033 			return err;
6034 		}
6035 		free(wline);
6036 		wline = NULL;
6037 		view->maxx = MAX(view->maxx, width);
6038 
6039 		if (nprinted == s->selected_line - 1)
6040 			wstandout(view->window);
6041 
6042 		if (blame->nlines > 0) {
6043 			blame_line = &blame->lines[lineno - 1];
6044 			if (blame_line->annotated && prev_id &&
6045 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6046 			    !(nprinted == s->selected_line - 1)) {
6047 				waddstr(view->window, "        ");
6048 			} else if (blame_line->annotated) {
6049 				char *id_str;
6050 				err = got_object_id_str(&id_str,
6051 				    blame_line->id);
6052 				if (err) {
6053 					free(line);
6054 					return err;
6055 				}
6056 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6057 				if (tc)
6058 					wattr_on(view->window,
6059 					    COLOR_PAIR(tc->colorpair), NULL);
6060 				wprintw(view->window, "%.8s", id_str);
6061 				if (tc)
6062 					wattr_off(view->window,
6063 					    COLOR_PAIR(tc->colorpair), NULL);
6064 				free(id_str);
6065 				prev_id = blame_line->id;
6066 			} else {
6067 				waddstr(view->window, "........");
6068 				prev_id = NULL;
6069 			}
6070 		} else {
6071 			waddstr(view->window, "........");
6072 			prev_id = NULL;
6073 		}
6074 
6075 		if (nprinted == s->selected_line - 1)
6076 			wstandend(view->window);
6077 		waddstr(view->window, " ");
6078 
6079 		if (view->ncols <= 9) {
6080 			width = 9;
6081 		} else if (s->first_displayed_line + nprinted ==
6082 		    s->matched_line &&
6083 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6084 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6085 			    view->window, view->x, regmatch);
6086 			if (err) {
6087 				free(line);
6088 				return err;
6089 			}
6090 			width += 9;
6091 		} else {
6092 			int skip;
6093 			err = format_line(&wline, &width, &skip, line,
6094 			    view->x, view->ncols - 9, 9, 1);
6095 			if (err) {
6096 				free(line);
6097 				return err;
6098 			}
6099 			waddwstr(view->window, &wline[skip]);
6100 			width += 9;
6101 			free(wline);
6102 			wline = NULL;
6103 		}
6104 
6105 		if (width <= view->ncols - 1)
6106 			waddch(view->window, '\n');
6107 		if (++nprinted == 1)
6108 			s->first_displayed_line = lineno;
6109 	}
6110 	free(line);
6111 	s->last_displayed_line = lineno;
6112 
6113 	view_border(view);
6114 
6115 	return NULL;
6116 }
6117 
6118 static const struct got_error *
6119 blame_cb(void *arg, int nlines, int lineno,
6120     struct got_commit_object *commit, struct got_object_id *id)
6121 {
6122 	const struct got_error *err = NULL;
6123 	struct tog_blame_cb_args *a = arg;
6124 	struct tog_blame_line *line;
6125 	int errcode;
6126 
6127 	if (nlines != a->nlines ||
6128 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6129 		return got_error(GOT_ERR_RANGE);
6130 
6131 	errcode = pthread_mutex_lock(&tog_mutex);
6132 	if (errcode)
6133 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6134 
6135 	if (*a->quit) {	/* user has quit the blame view */
6136 		err = got_error(GOT_ERR_ITER_COMPLETED);
6137 		goto done;
6138 	}
6139 
6140 	if (lineno == -1)
6141 		goto done; /* no change in this commit */
6142 
6143 	line = &a->lines[lineno - 1];
6144 	if (line->annotated)
6145 		goto done;
6146 
6147 	line->id = got_object_id_dup(id);
6148 	if (line->id == NULL) {
6149 		err = got_error_from_errno("got_object_id_dup");
6150 		goto done;
6151 	}
6152 	line->annotated = 1;
6153 done:
6154 	errcode = pthread_mutex_unlock(&tog_mutex);
6155 	if (errcode)
6156 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6157 	return err;
6158 }
6159 
6160 static void *
6161 blame_thread(void *arg)
6162 {
6163 	const struct got_error *err, *close_err;
6164 	struct tog_blame_thread_args *ta = arg;
6165 	struct tog_blame_cb_args *a = ta->cb_args;
6166 	int errcode, fd1 = -1, fd2 = -1;
6167 	FILE *f1 = NULL, *f2 = NULL;
6168 
6169 	fd1 = got_opentempfd();
6170 	if (fd1 == -1)
6171 		return (void *)got_error_from_errno("got_opentempfd");
6172 
6173 	fd2 = got_opentempfd();
6174 	if (fd2 == -1) {
6175 		err = got_error_from_errno("got_opentempfd");
6176 		goto done;
6177 	}
6178 
6179 	f1 = got_opentemp();
6180 	if (f1 == NULL) {
6181 		err = (void *)got_error_from_errno("got_opentemp");
6182 		goto done;
6183 	}
6184 	f2 = got_opentemp();
6185 	if (f2 == NULL) {
6186 		err = (void *)got_error_from_errno("got_opentemp");
6187 		goto done;
6188 	}
6189 
6190 	err = block_signals_used_by_main_thread();
6191 	if (err)
6192 		goto done;
6193 
6194 	err = got_blame(ta->path, a->commit_id, ta->repo,
6195 	    tog_diff_algo, blame_cb, ta->cb_args,
6196 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6197 	if (err && err->code == GOT_ERR_CANCELLED)
6198 		err = NULL;
6199 
6200 	errcode = pthread_mutex_lock(&tog_mutex);
6201 	if (errcode) {
6202 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6203 		goto done;
6204 	}
6205 
6206 	close_err = got_repo_close(ta->repo);
6207 	if (err == NULL)
6208 		err = close_err;
6209 	ta->repo = NULL;
6210 	*ta->complete = 1;
6211 
6212 	errcode = pthread_mutex_unlock(&tog_mutex);
6213 	if (errcode && err == NULL)
6214 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6215 
6216 done:
6217 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6218 		err = got_error_from_errno("close");
6219 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6220 		err = got_error_from_errno("close");
6221 	if (f1 && fclose(f1) == EOF && err == NULL)
6222 		err = got_error_from_errno("fclose");
6223 	if (f2 && fclose(f2) == EOF && err == NULL)
6224 		err = got_error_from_errno("fclose");
6225 
6226 	return (void *)err;
6227 }
6228 
6229 static struct got_object_id *
6230 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6231     int first_displayed_line, int selected_line)
6232 {
6233 	struct tog_blame_line *line;
6234 
6235 	if (nlines <= 0)
6236 		return NULL;
6237 
6238 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6239 	if (!line->annotated)
6240 		return NULL;
6241 
6242 	return line->id;
6243 }
6244 
6245 static struct got_object_id *
6246 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6247     int lineno)
6248 {
6249 	struct tog_blame_line *line;
6250 
6251 	if (nlines <= 0 || lineno >= nlines)
6252 		return NULL;
6253 
6254 	line = &lines[lineno - 1];
6255 	if (!line->annotated)
6256 		return NULL;
6257 
6258 	return line->id;
6259 }
6260 
6261 static const struct got_error *
6262 stop_blame(struct tog_blame *blame)
6263 {
6264 	const struct got_error *err = NULL;
6265 	int i;
6266 
6267 	if (blame->thread) {
6268 		int errcode;
6269 		errcode = pthread_mutex_unlock(&tog_mutex);
6270 		if (errcode)
6271 			return got_error_set_errno(errcode,
6272 			    "pthread_mutex_unlock");
6273 		errcode = pthread_join(blame->thread, (void **)&err);
6274 		if (errcode)
6275 			return got_error_set_errno(errcode, "pthread_join");
6276 		errcode = pthread_mutex_lock(&tog_mutex);
6277 		if (errcode)
6278 			return got_error_set_errno(errcode,
6279 			    "pthread_mutex_lock");
6280 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6281 			err = NULL;
6282 		blame->thread = NULL;
6283 	}
6284 	if (blame->thread_args.repo) {
6285 		const struct got_error *close_err;
6286 		close_err = got_repo_close(blame->thread_args.repo);
6287 		if (err == NULL)
6288 			err = close_err;
6289 		blame->thread_args.repo = NULL;
6290 	}
6291 	if (blame->f) {
6292 		if (fclose(blame->f) == EOF && err == NULL)
6293 			err = got_error_from_errno("fclose");
6294 		blame->f = NULL;
6295 	}
6296 	if (blame->lines) {
6297 		for (i = 0; i < blame->nlines; i++)
6298 			free(blame->lines[i].id);
6299 		free(blame->lines);
6300 		blame->lines = NULL;
6301 	}
6302 	free(blame->cb_args.commit_id);
6303 	blame->cb_args.commit_id = NULL;
6304 	if (blame->pack_fds) {
6305 		const struct got_error *pack_err =
6306 		    got_repo_pack_fds_close(blame->pack_fds);
6307 		if (err == NULL)
6308 			err = pack_err;
6309 		blame->pack_fds = NULL;
6310 	}
6311 	return err;
6312 }
6313 
6314 static const struct got_error *
6315 cancel_blame_view(void *arg)
6316 {
6317 	const struct got_error *err = NULL;
6318 	int *done = arg;
6319 	int errcode;
6320 
6321 	errcode = pthread_mutex_lock(&tog_mutex);
6322 	if (errcode)
6323 		return got_error_set_errno(errcode,
6324 		    "pthread_mutex_unlock");
6325 
6326 	if (*done)
6327 		err = got_error(GOT_ERR_CANCELLED);
6328 
6329 	errcode = pthread_mutex_unlock(&tog_mutex);
6330 	if (errcode)
6331 		return got_error_set_errno(errcode,
6332 		    "pthread_mutex_lock");
6333 
6334 	return err;
6335 }
6336 
6337 static const struct got_error *
6338 run_blame(struct tog_view *view)
6339 {
6340 	struct tog_blame_view_state *s = &view->state.blame;
6341 	struct tog_blame *blame = &s->blame;
6342 	const struct got_error *err = NULL;
6343 	struct got_commit_object *commit = NULL;
6344 	struct got_blob_object *blob = NULL;
6345 	struct got_repository *thread_repo = NULL;
6346 	struct got_object_id *obj_id = NULL;
6347 	int obj_type, fd = -1;
6348 	int *pack_fds = NULL;
6349 
6350 	err = got_object_open_as_commit(&commit, s->repo,
6351 	    &s->blamed_commit->id);
6352 	if (err)
6353 		return err;
6354 
6355 	fd = got_opentempfd();
6356 	if (fd == -1) {
6357 		err = got_error_from_errno("got_opentempfd");
6358 		goto done;
6359 	}
6360 
6361 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6362 	if (err)
6363 		goto done;
6364 
6365 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6366 	if (err)
6367 		goto done;
6368 
6369 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6370 		err = got_error(GOT_ERR_OBJ_TYPE);
6371 		goto done;
6372 	}
6373 
6374 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6375 	if (err)
6376 		goto done;
6377 	blame->f = got_opentemp();
6378 	if (blame->f == NULL) {
6379 		err = got_error_from_errno("got_opentemp");
6380 		goto done;
6381 	}
6382 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6383 	    &blame->line_offsets, blame->f, blob);
6384 	if (err)
6385 		goto done;
6386 	if (blame->nlines == 0) {
6387 		s->blame_complete = 1;
6388 		goto done;
6389 	}
6390 
6391 	/* Don't include \n at EOF in the blame line count. */
6392 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6393 		blame->nlines--;
6394 
6395 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6396 	if (blame->lines == NULL) {
6397 		err = got_error_from_errno("calloc");
6398 		goto done;
6399 	}
6400 
6401 	err = got_repo_pack_fds_open(&pack_fds);
6402 	if (err)
6403 		goto done;
6404 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6405 	    pack_fds);
6406 	if (err)
6407 		goto done;
6408 
6409 	blame->pack_fds = pack_fds;
6410 	blame->cb_args.view = view;
6411 	blame->cb_args.lines = blame->lines;
6412 	blame->cb_args.nlines = blame->nlines;
6413 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6414 	if (blame->cb_args.commit_id == NULL) {
6415 		err = got_error_from_errno("got_object_id_dup");
6416 		goto done;
6417 	}
6418 	blame->cb_args.quit = &s->done;
6419 
6420 	blame->thread_args.path = s->path;
6421 	blame->thread_args.repo = thread_repo;
6422 	blame->thread_args.cb_args = &blame->cb_args;
6423 	blame->thread_args.complete = &s->blame_complete;
6424 	blame->thread_args.cancel_cb = cancel_blame_view;
6425 	blame->thread_args.cancel_arg = &s->done;
6426 	s->blame_complete = 0;
6427 
6428 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6429 		s->first_displayed_line = 1;
6430 		s->last_displayed_line = view->nlines;
6431 		s->selected_line = 1;
6432 	}
6433 	s->matched_line = 0;
6434 
6435 done:
6436 	if (commit)
6437 		got_object_commit_close(commit);
6438 	if (fd != -1 && close(fd) == -1 && err == NULL)
6439 		err = got_error_from_errno("close");
6440 	if (blob)
6441 		got_object_blob_close(blob);
6442 	free(obj_id);
6443 	if (err)
6444 		stop_blame(blame);
6445 	return err;
6446 }
6447 
6448 static const struct got_error *
6449 open_blame_view(struct tog_view *view, char *path,
6450     struct got_object_id *commit_id, struct got_repository *repo)
6451 {
6452 	const struct got_error *err = NULL;
6453 	struct tog_blame_view_state *s = &view->state.blame;
6454 
6455 	STAILQ_INIT(&s->blamed_commits);
6456 
6457 	s->path = strdup(path);
6458 	if (s->path == NULL)
6459 		return got_error_from_errno("strdup");
6460 
6461 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6462 	if (err) {
6463 		free(s->path);
6464 		return err;
6465 	}
6466 
6467 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6468 	s->first_displayed_line = 1;
6469 	s->last_displayed_line = view->nlines;
6470 	s->selected_line = 1;
6471 	s->blame_complete = 0;
6472 	s->repo = repo;
6473 	s->commit_id = commit_id;
6474 	memset(&s->blame, 0, sizeof(s->blame));
6475 
6476 	STAILQ_INIT(&s->colors);
6477 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6478 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6479 		    get_color_value("TOG_COLOR_COMMIT"));
6480 		if (err)
6481 			return err;
6482 	}
6483 
6484 	view->show = show_blame_view;
6485 	view->input = input_blame_view;
6486 	view->reset = reset_blame_view;
6487 	view->close = close_blame_view;
6488 	view->search_start = search_start_blame_view;
6489 	view->search_setup = search_setup_blame_view;
6490 	view->search_next = search_next_view_match;
6491 
6492 	return run_blame(view);
6493 }
6494 
6495 static const struct got_error *
6496 close_blame_view(struct tog_view *view)
6497 {
6498 	const struct got_error *err = NULL;
6499 	struct tog_blame_view_state *s = &view->state.blame;
6500 
6501 	if (s->blame.thread)
6502 		err = stop_blame(&s->blame);
6503 
6504 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6505 		struct got_object_qid *blamed_commit;
6506 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6507 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6508 		got_object_qid_free(blamed_commit);
6509 	}
6510 
6511 	free(s->path);
6512 	free_colors(&s->colors);
6513 	return err;
6514 }
6515 
6516 static const struct got_error *
6517 search_start_blame_view(struct tog_view *view)
6518 {
6519 	struct tog_blame_view_state *s = &view->state.blame;
6520 
6521 	s->matched_line = 0;
6522 	return NULL;
6523 }
6524 
6525 static void
6526 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6527     size_t *nlines, int **first, int **last, int **match, int **selected)
6528 {
6529 	struct tog_blame_view_state *s = &view->state.blame;
6530 
6531 	*f = s->blame.f;
6532 	*nlines = s->blame.nlines;
6533 	*line_offsets = s->blame.line_offsets;
6534 	*match = &s->matched_line;
6535 	*first = &s->first_displayed_line;
6536 	*last = &s->last_displayed_line;
6537 	*selected = &s->selected_line;
6538 }
6539 
6540 static const struct got_error *
6541 show_blame_view(struct tog_view *view)
6542 {
6543 	const struct got_error *err = NULL;
6544 	struct tog_blame_view_state *s = &view->state.blame;
6545 	int errcode;
6546 
6547 	if (s->blame.thread == NULL && !s->blame_complete) {
6548 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6549 		    &s->blame.thread_args);
6550 		if (errcode)
6551 			return got_error_set_errno(errcode, "pthread_create");
6552 
6553 		if (!using_mock_io)
6554 			halfdelay(1); /* fast refresh while annotating  */
6555 	}
6556 
6557 	if (s->blame_complete && !using_mock_io)
6558 		halfdelay(10); /* disable fast refresh */
6559 
6560 	err = draw_blame(view);
6561 
6562 	view_border(view);
6563 	return err;
6564 }
6565 
6566 static const struct got_error *
6567 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6568     struct got_repository *repo, struct got_object_id *id)
6569 {
6570 	struct tog_view		*log_view;
6571 	const struct got_error	*err = NULL;
6572 
6573 	*new_view = NULL;
6574 
6575 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6576 	if (log_view == NULL)
6577 		return got_error_from_errno("view_open");
6578 
6579 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6580 	if (err)
6581 		view_close(log_view);
6582 	else
6583 		*new_view = log_view;
6584 
6585 	return err;
6586 }
6587 
6588 static const struct got_error *
6589 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6590 {
6591 	const struct got_error *err = NULL, *thread_err = NULL;
6592 	struct tog_view *diff_view;
6593 	struct tog_blame_view_state *s = &view->state.blame;
6594 	int eos, nscroll, begin_y = 0, begin_x = 0;
6595 
6596 	eos = nscroll = view->nlines - 2;
6597 	if (view_is_hsplit_top(view))
6598 		--eos;  /* border */
6599 
6600 	switch (ch) {
6601 	case '0':
6602 	case '$':
6603 	case KEY_RIGHT:
6604 	case 'l':
6605 	case KEY_LEFT:
6606 	case 'h':
6607 		horizontal_scroll_input(view, ch);
6608 		break;
6609 	case 'q':
6610 		s->done = 1;
6611 		break;
6612 	case 'g':
6613 	case KEY_HOME:
6614 		s->selected_line = 1;
6615 		s->first_displayed_line = 1;
6616 		view->count = 0;
6617 		break;
6618 	case 'G':
6619 	case KEY_END:
6620 		if (s->blame.nlines < eos) {
6621 			s->selected_line = s->blame.nlines;
6622 			s->first_displayed_line = 1;
6623 		} else {
6624 			s->selected_line = eos;
6625 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6626 		}
6627 		view->count = 0;
6628 		break;
6629 	case 'k':
6630 	case KEY_UP:
6631 	case CTRL('p'):
6632 		if (s->selected_line > 1)
6633 			s->selected_line--;
6634 		else if (s->selected_line == 1 &&
6635 		    s->first_displayed_line > 1)
6636 			s->first_displayed_line--;
6637 		else
6638 			view->count = 0;
6639 		break;
6640 	case CTRL('u'):
6641 	case 'u':
6642 		nscroll /= 2;
6643 		/* FALL THROUGH */
6644 	case KEY_PPAGE:
6645 	case CTRL('b'):
6646 	case 'b':
6647 		if (s->first_displayed_line == 1) {
6648 			if (view->count > 1)
6649 				nscroll += nscroll;
6650 			s->selected_line = MAX(1, s->selected_line - nscroll);
6651 			view->count = 0;
6652 			break;
6653 		}
6654 		if (s->first_displayed_line > nscroll)
6655 			s->first_displayed_line -= nscroll;
6656 		else
6657 			s->first_displayed_line = 1;
6658 		break;
6659 	case 'j':
6660 	case KEY_DOWN:
6661 	case CTRL('n'):
6662 		if (s->selected_line < eos && s->first_displayed_line +
6663 		    s->selected_line <= s->blame.nlines)
6664 			s->selected_line++;
6665 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6666 			s->first_displayed_line++;
6667 		else
6668 			view->count = 0;
6669 		break;
6670 	case 'c':
6671 	case 'p': {
6672 		struct got_object_id *id = NULL;
6673 
6674 		view->count = 0;
6675 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6676 		    s->first_displayed_line, s->selected_line);
6677 		if (id == NULL)
6678 			break;
6679 		if (ch == 'p') {
6680 			struct got_commit_object *commit, *pcommit;
6681 			struct got_object_qid *pid;
6682 			struct got_object_id *blob_id = NULL;
6683 			int obj_type;
6684 			err = got_object_open_as_commit(&commit,
6685 			    s->repo, id);
6686 			if (err)
6687 				break;
6688 			pid = STAILQ_FIRST(
6689 			    got_object_commit_get_parent_ids(commit));
6690 			if (pid == NULL) {
6691 				got_object_commit_close(commit);
6692 				break;
6693 			}
6694 			/* Check if path history ends here. */
6695 			err = got_object_open_as_commit(&pcommit,
6696 			    s->repo, &pid->id);
6697 			if (err)
6698 				break;
6699 			err = got_object_id_by_path(&blob_id, s->repo,
6700 			    pcommit, s->path);
6701 			got_object_commit_close(pcommit);
6702 			if (err) {
6703 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6704 					err = NULL;
6705 				got_object_commit_close(commit);
6706 				break;
6707 			}
6708 			err = got_object_get_type(&obj_type, s->repo,
6709 			    blob_id);
6710 			free(blob_id);
6711 			/* Can't blame non-blob type objects. */
6712 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6713 				got_object_commit_close(commit);
6714 				break;
6715 			}
6716 			err = got_object_qid_alloc(&s->blamed_commit,
6717 			    &pid->id);
6718 			got_object_commit_close(commit);
6719 		} else {
6720 			if (got_object_id_cmp(id,
6721 			    &s->blamed_commit->id) == 0)
6722 				break;
6723 			err = got_object_qid_alloc(&s->blamed_commit,
6724 			    id);
6725 		}
6726 		if (err)
6727 			break;
6728 		s->done = 1;
6729 		thread_err = stop_blame(&s->blame);
6730 		s->done = 0;
6731 		if (thread_err)
6732 			break;
6733 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6734 		    s->blamed_commit, entry);
6735 		err = run_blame(view);
6736 		if (err)
6737 			break;
6738 		break;
6739 	}
6740 	case 'C': {
6741 		struct got_object_qid *first;
6742 
6743 		view->count = 0;
6744 		first = STAILQ_FIRST(&s->blamed_commits);
6745 		if (!got_object_id_cmp(&first->id, s->commit_id))
6746 			break;
6747 		s->done = 1;
6748 		thread_err = stop_blame(&s->blame);
6749 		s->done = 0;
6750 		if (thread_err)
6751 			break;
6752 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6753 		got_object_qid_free(s->blamed_commit);
6754 		s->blamed_commit =
6755 		    STAILQ_FIRST(&s->blamed_commits);
6756 		err = run_blame(view);
6757 		if (err)
6758 			break;
6759 		break;
6760 	}
6761 	case 'L':
6762 		view->count = 0;
6763 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6764 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6765 		if (s->id_to_log)
6766 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6767 		break;
6768 	case KEY_ENTER:
6769 	case '\r': {
6770 		struct got_object_id *id = NULL;
6771 		struct got_object_qid *pid;
6772 		struct got_commit_object *commit = NULL;
6773 
6774 		view->count = 0;
6775 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6776 		    s->first_displayed_line, s->selected_line);
6777 		if (id == NULL)
6778 			break;
6779 		err = got_object_open_as_commit(&commit, s->repo, id);
6780 		if (err)
6781 			break;
6782 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6783 		if (*new_view) {
6784 			/* traversed from diff view, release diff resources  */
6785 			err = close_diff_view(*new_view);
6786 			if (err)
6787 				break;
6788 			diff_view = *new_view;
6789 		} else {
6790 			if (view_is_parent_view(view))
6791 				view_get_split(view, &begin_y, &begin_x);
6792 
6793 			diff_view = view_open(0, 0, begin_y, begin_x,
6794 			    TOG_VIEW_DIFF);
6795 			if (diff_view == NULL) {
6796 				got_object_commit_close(commit);
6797 				err = got_error_from_errno("view_open");
6798 				break;
6799 			}
6800 		}
6801 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6802 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6803 		got_object_commit_close(commit);
6804 		if (err) {
6805 			view_close(diff_view);
6806 			break;
6807 		}
6808 		s->last_diffed_line = s->first_displayed_line - 1 +
6809 		    s->selected_line;
6810 		if (*new_view)
6811 			break;	/* still open from active diff view */
6812 		if (view_is_parent_view(view) &&
6813 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6814 			err = view_init_hsplit(view, begin_y);
6815 			if (err)
6816 				break;
6817 		}
6818 
6819 		view->focussed = 0;
6820 		diff_view->focussed = 1;
6821 		diff_view->mode = view->mode;
6822 		diff_view->nlines = view->lines - begin_y;
6823 		if (view_is_parent_view(view)) {
6824 			view_transfer_size(diff_view, view);
6825 			err = view_close_child(view);
6826 			if (err)
6827 				break;
6828 			err = view_set_child(view, diff_view);
6829 			if (err)
6830 				break;
6831 			view->focus_child = 1;
6832 		} else
6833 			*new_view = diff_view;
6834 		if (err)
6835 			break;
6836 		break;
6837 	}
6838 	case CTRL('d'):
6839 	case 'd':
6840 		nscroll /= 2;
6841 		/* FALL THROUGH */
6842 	case KEY_NPAGE:
6843 	case CTRL('f'):
6844 	case 'f':
6845 	case ' ':
6846 		if (s->last_displayed_line >= s->blame.nlines &&
6847 		    s->selected_line >= MIN(s->blame.nlines,
6848 		    view->nlines - 2)) {
6849 			view->count = 0;
6850 			break;
6851 		}
6852 		if (s->last_displayed_line >= s->blame.nlines &&
6853 		    s->selected_line < view->nlines - 2) {
6854 			s->selected_line +=
6855 			    MIN(nscroll, s->last_displayed_line -
6856 			    s->first_displayed_line - s->selected_line + 1);
6857 		}
6858 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6859 			s->first_displayed_line += nscroll;
6860 		else
6861 			s->first_displayed_line =
6862 			    s->blame.nlines - (view->nlines - 3);
6863 		break;
6864 	case KEY_RESIZE:
6865 		if (s->selected_line > view->nlines - 2) {
6866 			s->selected_line = MIN(s->blame.nlines,
6867 			    view->nlines - 2);
6868 		}
6869 		break;
6870 	default:
6871 		view->count = 0;
6872 		break;
6873 	}
6874 	return thread_err ? thread_err : err;
6875 }
6876 
6877 static const struct got_error *
6878 reset_blame_view(struct tog_view *view)
6879 {
6880 	const struct got_error *err;
6881 	struct tog_blame_view_state *s = &view->state.blame;
6882 
6883 	view->count = 0;
6884 	s->done = 1;
6885 	err = stop_blame(&s->blame);
6886 	s->done = 0;
6887 	if (err)
6888 		return err;
6889 	return run_blame(view);
6890 }
6891 
6892 static const struct got_error *
6893 cmd_blame(int argc, char *argv[])
6894 {
6895 	const struct got_error *error;
6896 	struct got_repository *repo = NULL;
6897 	struct got_worktree *worktree = NULL;
6898 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6899 	char *link_target = NULL;
6900 	struct got_object_id *commit_id = NULL;
6901 	struct got_commit_object *commit = NULL;
6902 	char *commit_id_str = NULL;
6903 	int ch;
6904 	struct tog_view *view = NULL;
6905 	int *pack_fds = NULL;
6906 
6907 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6908 		switch (ch) {
6909 		case 'c':
6910 			commit_id_str = optarg;
6911 			break;
6912 		case 'r':
6913 			repo_path = realpath(optarg, NULL);
6914 			if (repo_path == NULL)
6915 				return got_error_from_errno2("realpath",
6916 				    optarg);
6917 			break;
6918 		default:
6919 			usage_blame();
6920 			/* NOTREACHED */
6921 		}
6922 	}
6923 
6924 	argc -= optind;
6925 	argv += optind;
6926 
6927 	if (argc != 1)
6928 		usage_blame();
6929 
6930 	error = got_repo_pack_fds_open(&pack_fds);
6931 	if (error != NULL)
6932 		goto done;
6933 
6934 	if (repo_path == NULL) {
6935 		cwd = getcwd(NULL, 0);
6936 		if (cwd == NULL)
6937 			return got_error_from_errno("getcwd");
6938 		error = got_worktree_open(&worktree, cwd);
6939 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6940 			goto done;
6941 		if (worktree)
6942 			repo_path =
6943 			    strdup(got_worktree_get_repo_path(worktree));
6944 		else
6945 			repo_path = strdup(cwd);
6946 		if (repo_path == NULL) {
6947 			error = got_error_from_errno("strdup");
6948 			goto done;
6949 		}
6950 	}
6951 
6952 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6953 	if (error != NULL)
6954 		goto done;
6955 
6956 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6957 	    worktree);
6958 	if (error)
6959 		goto done;
6960 
6961 	init_curses();
6962 
6963 	error = apply_unveil(got_repo_get_path(repo), NULL);
6964 	if (error)
6965 		goto done;
6966 
6967 	error = tog_load_refs(repo, 0);
6968 	if (error)
6969 		goto done;
6970 
6971 	if (commit_id_str == NULL) {
6972 		struct got_reference *head_ref;
6973 		error = got_ref_open(&head_ref, repo, worktree ?
6974 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6975 		if (error != NULL)
6976 			goto done;
6977 		error = got_ref_resolve(&commit_id, repo, head_ref);
6978 		got_ref_close(head_ref);
6979 	} else {
6980 		error = got_repo_match_object_id(&commit_id, NULL,
6981 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6982 	}
6983 	if (error != NULL)
6984 		goto done;
6985 
6986 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6987 	if (view == NULL) {
6988 		error = got_error_from_errno("view_open");
6989 		goto done;
6990 	}
6991 
6992 	error = got_object_open_as_commit(&commit, repo, commit_id);
6993 	if (error)
6994 		goto done;
6995 
6996 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6997 	    commit, repo);
6998 	if (error)
6999 		goto done;
7000 
7001 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7002 	    commit_id, repo);
7003 	if (error)
7004 		goto done;
7005 	if (worktree) {
7006 		/* Release work tree lock. */
7007 		got_worktree_close(worktree);
7008 		worktree = NULL;
7009 	}
7010 	error = view_loop(view);
7011 done:
7012 	free(repo_path);
7013 	free(in_repo_path);
7014 	free(link_target);
7015 	free(cwd);
7016 	free(commit_id);
7017 	if (error != NULL && view != NULL) {
7018 		if (view->close == NULL)
7019 			close_blame_view(view);
7020 		view_close(view);
7021 	}
7022 	if (commit)
7023 		got_object_commit_close(commit);
7024 	if (worktree)
7025 		got_worktree_close(worktree);
7026 	if (repo) {
7027 		const struct got_error *close_err = got_repo_close(repo);
7028 		if (error == NULL)
7029 			error = close_err;
7030 	}
7031 	if (pack_fds) {
7032 		const struct got_error *pack_err =
7033 		    got_repo_pack_fds_close(pack_fds);
7034 		if (error == NULL)
7035 			error = pack_err;
7036 	}
7037 	tog_free_refs();
7038 	return error;
7039 }
7040 
7041 static const struct got_error *
7042 draw_tree_entries(struct tog_view *view, const char *parent_path)
7043 {
7044 	struct tog_tree_view_state *s = &view->state.tree;
7045 	const struct got_error *err = NULL;
7046 	struct got_tree_entry *te;
7047 	wchar_t *wline;
7048 	char *index = NULL;
7049 	struct tog_color *tc;
7050 	int width, n, nentries, scrollx, i = 1;
7051 	int limit = view->nlines;
7052 
7053 	s->ndisplayed = 0;
7054 	if (view_is_hsplit_top(view))
7055 		--limit;  /* border */
7056 
7057 	werase(view->window);
7058 
7059 	if (limit == 0)
7060 		return NULL;
7061 
7062 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7063 	    0, 0);
7064 	if (err)
7065 		return err;
7066 	if (view_needs_focus_indication(view))
7067 		wstandout(view->window);
7068 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7069 	if (tc)
7070 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7071 	waddwstr(view->window, wline);
7072 	free(wline);
7073 	wline = NULL;
7074 	while (width++ < view->ncols)
7075 		waddch(view->window, ' ');
7076 	if (tc)
7077 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7078 	if (view_needs_focus_indication(view))
7079 		wstandend(view->window);
7080 	if (--limit <= 0)
7081 		return NULL;
7082 
7083 	i += s->selected;
7084 	if (s->first_displayed_entry) {
7085 		i += got_tree_entry_get_index(s->first_displayed_entry);
7086 		if (s->tree != s->root)
7087 			++i;  /* account for ".." entry */
7088 	}
7089 	nentries = got_object_tree_get_nentries(s->tree);
7090 	if (asprintf(&index, "[%d/%d] %s",
7091 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7092 		return got_error_from_errno("asprintf");
7093 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7094 	free(index);
7095 	if (err)
7096 		return err;
7097 	waddwstr(view->window, wline);
7098 	free(wline);
7099 	wline = NULL;
7100 	if (width < view->ncols - 1)
7101 		waddch(view->window, '\n');
7102 	if (--limit <= 0)
7103 		return NULL;
7104 	waddch(view->window, '\n');
7105 	if (--limit <= 0)
7106 		return NULL;
7107 
7108 	if (s->first_displayed_entry == NULL) {
7109 		te = got_object_tree_get_first_entry(s->tree);
7110 		if (s->selected == 0) {
7111 			if (view->focussed)
7112 				wstandout(view->window);
7113 			s->selected_entry = NULL;
7114 		}
7115 		waddstr(view->window, "  ..\n");	/* parent directory */
7116 		if (s->selected == 0 && view->focussed)
7117 			wstandend(view->window);
7118 		s->ndisplayed++;
7119 		if (--limit <= 0)
7120 			return NULL;
7121 		n = 1;
7122 	} else {
7123 		n = 0;
7124 		te = s->first_displayed_entry;
7125 	}
7126 
7127 	view->maxx = 0;
7128 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7129 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7130 		const char *modestr = "";
7131 		mode_t mode;
7132 
7133 		te = got_object_tree_get_entry(s->tree, i);
7134 		mode = got_tree_entry_get_mode(te);
7135 
7136 		if (s->show_ids) {
7137 			err = got_object_id_str(&id_str,
7138 			    got_tree_entry_get_id(te));
7139 			if (err)
7140 				return got_error_from_errno(
7141 				    "got_object_id_str");
7142 		}
7143 		if (got_object_tree_entry_is_submodule(te))
7144 			modestr = "$";
7145 		else if (S_ISLNK(mode)) {
7146 			int i;
7147 
7148 			err = got_tree_entry_get_symlink_target(&link_target,
7149 			    te, s->repo);
7150 			if (err) {
7151 				free(id_str);
7152 				return err;
7153 			}
7154 			for (i = 0; i < strlen(link_target); i++) {
7155 				if (!isprint((unsigned char)link_target[i]))
7156 					link_target[i] = '?';
7157 			}
7158 			modestr = "@";
7159 		}
7160 		else if (S_ISDIR(mode))
7161 			modestr = "/";
7162 		else if (mode & S_IXUSR)
7163 			modestr = "*";
7164 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7165 		    got_tree_entry_get_name(te), modestr,
7166 		    link_target ? " -> ": "",
7167 		    link_target ? link_target : "") == -1) {
7168 			free(id_str);
7169 			free(link_target);
7170 			return got_error_from_errno("asprintf");
7171 		}
7172 		free(id_str);
7173 		free(link_target);
7174 
7175 		/* use full line width to determine view->maxx */
7176 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7177 		if (err) {
7178 			free(line);
7179 			break;
7180 		}
7181 		view->maxx = MAX(view->maxx, width);
7182 		free(wline);
7183 		wline = NULL;
7184 
7185 		err = format_line(&wline, &width, &scrollx, line, view->x,
7186 		    view->ncols, 0, 0);
7187 		if (err) {
7188 			free(line);
7189 			break;
7190 		}
7191 		if (n == s->selected) {
7192 			if (view->focussed)
7193 				wstandout(view->window);
7194 			s->selected_entry = te;
7195 		}
7196 		tc = match_color(&s->colors, line);
7197 		if (tc)
7198 			wattr_on(view->window,
7199 			    COLOR_PAIR(tc->colorpair), NULL);
7200 		waddwstr(view->window, &wline[scrollx]);
7201 		if (tc)
7202 			wattr_off(view->window,
7203 			    COLOR_PAIR(tc->colorpair), NULL);
7204 		if (width < view->ncols)
7205 			waddch(view->window, '\n');
7206 		if (n == s->selected && view->focussed)
7207 			wstandend(view->window);
7208 		free(line);
7209 		free(wline);
7210 		wline = NULL;
7211 		n++;
7212 		s->ndisplayed++;
7213 		s->last_displayed_entry = te;
7214 		if (--limit <= 0)
7215 			break;
7216 	}
7217 
7218 	return err;
7219 }
7220 
7221 static void
7222 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7223 {
7224 	struct got_tree_entry *te;
7225 	int isroot = s->tree == s->root;
7226 	int i = 0;
7227 
7228 	if (s->first_displayed_entry == NULL)
7229 		return;
7230 
7231 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7232 	while (i++ < maxscroll) {
7233 		if (te == NULL) {
7234 			if (!isroot)
7235 				s->first_displayed_entry = NULL;
7236 			break;
7237 		}
7238 		s->first_displayed_entry = te;
7239 		te = got_tree_entry_get_prev(s->tree, te);
7240 	}
7241 }
7242 
7243 static const struct got_error *
7244 tree_scroll_down(struct tog_view *view, int maxscroll)
7245 {
7246 	struct tog_tree_view_state *s = &view->state.tree;
7247 	struct got_tree_entry *next, *last;
7248 	int n = 0;
7249 
7250 	if (s->first_displayed_entry)
7251 		next = got_tree_entry_get_next(s->tree,
7252 		    s->first_displayed_entry);
7253 	else
7254 		next = got_object_tree_get_first_entry(s->tree);
7255 
7256 	last = s->last_displayed_entry;
7257 	while (next && n++ < maxscroll) {
7258 		if (last) {
7259 			s->last_displayed_entry = last;
7260 			last = got_tree_entry_get_next(s->tree, last);
7261 		}
7262 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7263 			s->first_displayed_entry = next;
7264 			next = got_tree_entry_get_next(s->tree, next);
7265 		}
7266 	}
7267 
7268 	return NULL;
7269 }
7270 
7271 static const struct got_error *
7272 tree_entry_path(char **path, struct tog_parent_trees *parents,
7273     struct got_tree_entry *te)
7274 {
7275 	const struct got_error *err = NULL;
7276 	struct tog_parent_tree *pt;
7277 	size_t len = 2; /* for leading slash and NUL */
7278 
7279 	TAILQ_FOREACH(pt, parents, entry)
7280 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7281 		    + 1 /* slash */;
7282 	if (te)
7283 		len += strlen(got_tree_entry_get_name(te));
7284 
7285 	*path = calloc(1, len);
7286 	if (path == NULL)
7287 		return got_error_from_errno("calloc");
7288 
7289 	(*path)[0] = '/';
7290 	pt = TAILQ_LAST(parents, tog_parent_trees);
7291 	while (pt) {
7292 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7293 		if (strlcat(*path, name, len) >= len) {
7294 			err = got_error(GOT_ERR_NO_SPACE);
7295 			goto done;
7296 		}
7297 		if (strlcat(*path, "/", len) >= len) {
7298 			err = got_error(GOT_ERR_NO_SPACE);
7299 			goto done;
7300 		}
7301 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7302 	}
7303 	if (te) {
7304 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7305 			err = got_error(GOT_ERR_NO_SPACE);
7306 			goto done;
7307 		}
7308 	}
7309 done:
7310 	if (err) {
7311 		free(*path);
7312 		*path = NULL;
7313 	}
7314 	return err;
7315 }
7316 
7317 static const struct got_error *
7318 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7319     struct got_tree_entry *te, struct tog_parent_trees *parents,
7320     struct got_object_id *commit_id, struct got_repository *repo)
7321 {
7322 	const struct got_error *err = NULL;
7323 	char *path;
7324 	struct tog_view *blame_view;
7325 
7326 	*new_view = NULL;
7327 
7328 	err = tree_entry_path(&path, parents, te);
7329 	if (err)
7330 		return err;
7331 
7332 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7333 	if (blame_view == NULL) {
7334 		err = got_error_from_errno("view_open");
7335 		goto done;
7336 	}
7337 
7338 	err = open_blame_view(blame_view, path, commit_id, repo);
7339 	if (err) {
7340 		if (err->code == GOT_ERR_CANCELLED)
7341 			err = NULL;
7342 		view_close(blame_view);
7343 	} else
7344 		*new_view = blame_view;
7345 done:
7346 	free(path);
7347 	return err;
7348 }
7349 
7350 static const struct got_error *
7351 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7352     struct tog_tree_view_state *s)
7353 {
7354 	struct tog_view *log_view;
7355 	const struct got_error *err = NULL;
7356 	char *path;
7357 
7358 	*new_view = NULL;
7359 
7360 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7361 	if (log_view == NULL)
7362 		return got_error_from_errno("view_open");
7363 
7364 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7365 	if (err)
7366 		return err;
7367 
7368 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7369 	    path, 0);
7370 	if (err)
7371 		view_close(log_view);
7372 	else
7373 		*new_view = log_view;
7374 	free(path);
7375 	return err;
7376 }
7377 
7378 static const struct got_error *
7379 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7380     const char *head_ref_name, struct got_repository *repo)
7381 {
7382 	const struct got_error *err = NULL;
7383 	char *commit_id_str = NULL;
7384 	struct tog_tree_view_state *s = &view->state.tree;
7385 	struct got_commit_object *commit = NULL;
7386 
7387 	TAILQ_INIT(&s->parents);
7388 	STAILQ_INIT(&s->colors);
7389 
7390 	s->commit_id = got_object_id_dup(commit_id);
7391 	if (s->commit_id == NULL) {
7392 		err = got_error_from_errno("got_object_id_dup");
7393 		goto done;
7394 	}
7395 
7396 	err = got_object_open_as_commit(&commit, repo, commit_id);
7397 	if (err)
7398 		goto done;
7399 
7400 	/*
7401 	 * The root is opened here and will be closed when the view is closed.
7402 	 * Any visited subtrees and their path-wise parents are opened and
7403 	 * closed on demand.
7404 	 */
7405 	err = got_object_open_as_tree(&s->root, repo,
7406 	    got_object_commit_get_tree_id(commit));
7407 	if (err)
7408 		goto done;
7409 	s->tree = s->root;
7410 
7411 	err = got_object_id_str(&commit_id_str, commit_id);
7412 	if (err != NULL)
7413 		goto done;
7414 
7415 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7416 		err = got_error_from_errno("asprintf");
7417 		goto done;
7418 	}
7419 
7420 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7421 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7422 	if (head_ref_name) {
7423 		s->head_ref_name = strdup(head_ref_name);
7424 		if (s->head_ref_name == NULL) {
7425 			err = got_error_from_errno("strdup");
7426 			goto done;
7427 		}
7428 	}
7429 	s->repo = repo;
7430 
7431 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7432 		err = add_color(&s->colors, "\\$$",
7433 		    TOG_COLOR_TREE_SUBMODULE,
7434 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7435 		if (err)
7436 			goto done;
7437 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7438 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7439 		if (err)
7440 			goto done;
7441 		err = add_color(&s->colors, "/$",
7442 		    TOG_COLOR_TREE_DIRECTORY,
7443 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7444 		if (err)
7445 			goto done;
7446 
7447 		err = add_color(&s->colors, "\\*$",
7448 		    TOG_COLOR_TREE_EXECUTABLE,
7449 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7450 		if (err)
7451 			goto done;
7452 
7453 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7454 		    get_color_value("TOG_COLOR_COMMIT"));
7455 		if (err)
7456 			goto done;
7457 	}
7458 
7459 	view->show = show_tree_view;
7460 	view->input = input_tree_view;
7461 	view->close = close_tree_view;
7462 	view->search_start = search_start_tree_view;
7463 	view->search_next = search_next_tree_view;
7464 done:
7465 	free(commit_id_str);
7466 	if (commit)
7467 		got_object_commit_close(commit);
7468 	if (err) {
7469 		if (view->close == NULL)
7470 			close_tree_view(view);
7471 		view_close(view);
7472 	}
7473 	return err;
7474 }
7475 
7476 static const struct got_error *
7477 close_tree_view(struct tog_view *view)
7478 {
7479 	struct tog_tree_view_state *s = &view->state.tree;
7480 
7481 	free_colors(&s->colors);
7482 	free(s->tree_label);
7483 	s->tree_label = NULL;
7484 	free(s->commit_id);
7485 	s->commit_id = NULL;
7486 	free(s->head_ref_name);
7487 	s->head_ref_name = NULL;
7488 	while (!TAILQ_EMPTY(&s->parents)) {
7489 		struct tog_parent_tree *parent;
7490 		parent = TAILQ_FIRST(&s->parents);
7491 		TAILQ_REMOVE(&s->parents, parent, entry);
7492 		if (parent->tree != s->root)
7493 			got_object_tree_close(parent->tree);
7494 		free(parent);
7495 
7496 	}
7497 	if (s->tree != NULL && s->tree != s->root)
7498 		got_object_tree_close(s->tree);
7499 	if (s->root)
7500 		got_object_tree_close(s->root);
7501 	return NULL;
7502 }
7503 
7504 static const struct got_error *
7505 search_start_tree_view(struct tog_view *view)
7506 {
7507 	struct tog_tree_view_state *s = &view->state.tree;
7508 
7509 	s->matched_entry = NULL;
7510 	return NULL;
7511 }
7512 
7513 static int
7514 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7515 {
7516 	regmatch_t regmatch;
7517 
7518 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7519 	    0) == 0;
7520 }
7521 
7522 static const struct got_error *
7523 search_next_tree_view(struct tog_view *view)
7524 {
7525 	struct tog_tree_view_state *s = &view->state.tree;
7526 	struct got_tree_entry *te = NULL;
7527 
7528 	if (!view->searching) {
7529 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7530 		return NULL;
7531 	}
7532 
7533 	if (s->matched_entry) {
7534 		if (view->searching == TOG_SEARCH_FORWARD) {
7535 			if (s->selected_entry)
7536 				te = got_tree_entry_get_next(s->tree,
7537 				    s->selected_entry);
7538 			else
7539 				te = got_object_tree_get_first_entry(s->tree);
7540 		} else {
7541 			if (s->selected_entry == NULL)
7542 				te = got_object_tree_get_last_entry(s->tree);
7543 			else
7544 				te = got_tree_entry_get_prev(s->tree,
7545 				    s->selected_entry);
7546 		}
7547 	} else {
7548 		if (s->selected_entry)
7549 			te = s->selected_entry;
7550 		else if (view->searching == TOG_SEARCH_FORWARD)
7551 			te = got_object_tree_get_first_entry(s->tree);
7552 		else
7553 			te = got_object_tree_get_last_entry(s->tree);
7554 	}
7555 
7556 	while (1) {
7557 		if (te == NULL) {
7558 			if (s->matched_entry == NULL) {
7559 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7560 				return NULL;
7561 			}
7562 			if (view->searching == TOG_SEARCH_FORWARD)
7563 				te = got_object_tree_get_first_entry(s->tree);
7564 			else
7565 				te = got_object_tree_get_last_entry(s->tree);
7566 		}
7567 
7568 		if (match_tree_entry(te, &view->regex)) {
7569 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7570 			s->matched_entry = te;
7571 			break;
7572 		}
7573 
7574 		if (view->searching == TOG_SEARCH_FORWARD)
7575 			te = got_tree_entry_get_next(s->tree, te);
7576 		else
7577 			te = got_tree_entry_get_prev(s->tree, te);
7578 	}
7579 
7580 	if (s->matched_entry) {
7581 		s->first_displayed_entry = s->matched_entry;
7582 		s->selected = 0;
7583 	}
7584 
7585 	return NULL;
7586 }
7587 
7588 static const struct got_error *
7589 show_tree_view(struct tog_view *view)
7590 {
7591 	const struct got_error *err = NULL;
7592 	struct tog_tree_view_state *s = &view->state.tree;
7593 	char *parent_path;
7594 
7595 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7596 	if (err)
7597 		return err;
7598 
7599 	err = draw_tree_entries(view, parent_path);
7600 	free(parent_path);
7601 
7602 	view_border(view);
7603 	return err;
7604 }
7605 
7606 static const struct got_error *
7607 tree_goto_line(struct tog_view *view, int nlines)
7608 {
7609 	const struct got_error		 *err = NULL;
7610 	struct tog_tree_view_state	 *s = &view->state.tree;
7611 	struct got_tree_entry		**fte, **lte, **ste;
7612 	int				  g, last, first = 1, i = 1;
7613 	int				  root = s->tree == s->root;
7614 	int				  off = root ? 1 : 2;
7615 
7616 	g = view->gline;
7617 	view->gline = 0;
7618 
7619 	if (g == 0)
7620 		g = 1;
7621 	else if (g > got_object_tree_get_nentries(s->tree))
7622 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7623 
7624 	fte = &s->first_displayed_entry;
7625 	lte = &s->last_displayed_entry;
7626 	ste = &s->selected_entry;
7627 
7628 	if (*fte != NULL) {
7629 		first = got_tree_entry_get_index(*fte);
7630 		first += off;  /* account for ".." */
7631 	}
7632 	last = got_tree_entry_get_index(*lte);
7633 	last += off;
7634 
7635 	if (g >= first && g <= last && g - first < nlines) {
7636 		s->selected = g - first;
7637 		return NULL;	/* gline is on the current page */
7638 	}
7639 
7640 	if (*ste != NULL) {
7641 		i = got_tree_entry_get_index(*ste);
7642 		i += off;
7643 	}
7644 
7645 	if (i < g) {
7646 		err = tree_scroll_down(view, g - i);
7647 		if (err)
7648 			return err;
7649 		if (got_tree_entry_get_index(*lte) >=
7650 		    got_object_tree_get_nentries(s->tree) - 1 &&
7651 		    first + s->selected < g &&
7652 		    s->selected < s->ndisplayed - 1) {
7653 			first = got_tree_entry_get_index(*fte);
7654 			first += off;
7655 			s->selected = g - first;
7656 		}
7657 	} else if (i > g)
7658 		tree_scroll_up(s, i - g);
7659 
7660 	if (g < nlines &&
7661 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7662 		s->selected = g - 1;
7663 
7664 	return NULL;
7665 }
7666 
7667 static const struct got_error *
7668 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7669 {
7670 	const struct got_error *err = NULL;
7671 	struct tog_tree_view_state *s = &view->state.tree;
7672 	struct got_tree_entry *te;
7673 	int n, nscroll = view->nlines - 3;
7674 
7675 	if (view->gline)
7676 		return tree_goto_line(view, nscroll);
7677 
7678 	switch (ch) {
7679 	case '0':
7680 	case '$':
7681 	case KEY_RIGHT:
7682 	case 'l':
7683 	case KEY_LEFT:
7684 	case 'h':
7685 		horizontal_scroll_input(view, ch);
7686 		break;
7687 	case 'i':
7688 		s->show_ids = !s->show_ids;
7689 		view->count = 0;
7690 		break;
7691 	case 'L':
7692 		view->count = 0;
7693 		if (!s->selected_entry)
7694 			break;
7695 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7696 		break;
7697 	case 'R':
7698 		view->count = 0;
7699 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7700 		break;
7701 	case 'g':
7702 	case '=':
7703 	case KEY_HOME:
7704 		s->selected = 0;
7705 		view->count = 0;
7706 		if (s->tree == s->root)
7707 			s->first_displayed_entry =
7708 			    got_object_tree_get_first_entry(s->tree);
7709 		else
7710 			s->first_displayed_entry = NULL;
7711 		break;
7712 	case 'G':
7713 	case '*':
7714 	case KEY_END: {
7715 		int eos = view->nlines - 3;
7716 
7717 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7718 			--eos;  /* border */
7719 		s->selected = 0;
7720 		view->count = 0;
7721 		te = got_object_tree_get_last_entry(s->tree);
7722 		for (n = 0; n < eos; n++) {
7723 			if (te == NULL) {
7724 				if (s->tree != s->root) {
7725 					s->first_displayed_entry = NULL;
7726 					n++;
7727 				}
7728 				break;
7729 			}
7730 			s->first_displayed_entry = te;
7731 			te = got_tree_entry_get_prev(s->tree, te);
7732 		}
7733 		if (n > 0)
7734 			s->selected = n - 1;
7735 		break;
7736 	}
7737 	case 'k':
7738 	case KEY_UP:
7739 	case CTRL('p'):
7740 		if (s->selected > 0) {
7741 			s->selected--;
7742 			break;
7743 		}
7744 		tree_scroll_up(s, 1);
7745 		if (s->selected_entry == NULL ||
7746 		    (s->tree == s->root && s->selected_entry ==
7747 		     got_object_tree_get_first_entry(s->tree)))
7748 			view->count = 0;
7749 		break;
7750 	case CTRL('u'):
7751 	case 'u':
7752 		nscroll /= 2;
7753 		/* FALL THROUGH */
7754 	case KEY_PPAGE:
7755 	case CTRL('b'):
7756 	case 'b':
7757 		if (s->tree == s->root) {
7758 			if (got_object_tree_get_first_entry(s->tree) ==
7759 			    s->first_displayed_entry)
7760 				s->selected -= MIN(s->selected, nscroll);
7761 		} else {
7762 			if (s->first_displayed_entry == NULL)
7763 				s->selected -= MIN(s->selected, nscroll);
7764 		}
7765 		tree_scroll_up(s, MAX(0, nscroll));
7766 		if (s->selected_entry == NULL ||
7767 		    (s->tree == s->root && s->selected_entry ==
7768 		     got_object_tree_get_first_entry(s->tree)))
7769 			view->count = 0;
7770 		break;
7771 	case 'j':
7772 	case KEY_DOWN:
7773 	case CTRL('n'):
7774 		if (s->selected < s->ndisplayed - 1) {
7775 			s->selected++;
7776 			break;
7777 		}
7778 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7779 		    == NULL) {
7780 			/* can't scroll any further */
7781 			view->count = 0;
7782 			break;
7783 		}
7784 		tree_scroll_down(view, 1);
7785 		break;
7786 	case CTRL('d'):
7787 	case 'd':
7788 		nscroll /= 2;
7789 		/* FALL THROUGH */
7790 	case KEY_NPAGE:
7791 	case CTRL('f'):
7792 	case 'f':
7793 	case ' ':
7794 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7795 		    == NULL) {
7796 			/* can't scroll any further; move cursor down */
7797 			if (s->selected < s->ndisplayed - 1)
7798 				s->selected += MIN(nscroll,
7799 				    s->ndisplayed - s->selected - 1);
7800 			else
7801 				view->count = 0;
7802 			break;
7803 		}
7804 		tree_scroll_down(view, nscroll);
7805 		break;
7806 	case KEY_ENTER:
7807 	case '\r':
7808 	case KEY_BACKSPACE:
7809 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7810 			struct tog_parent_tree *parent;
7811 			/* user selected '..' */
7812 			if (s->tree == s->root) {
7813 				view->count = 0;
7814 				break;
7815 			}
7816 			parent = TAILQ_FIRST(&s->parents);
7817 			TAILQ_REMOVE(&s->parents, parent,
7818 			    entry);
7819 			got_object_tree_close(s->tree);
7820 			s->tree = parent->tree;
7821 			s->first_displayed_entry =
7822 			    parent->first_displayed_entry;
7823 			s->selected_entry =
7824 			    parent->selected_entry;
7825 			s->selected = parent->selected;
7826 			if (s->selected > view->nlines - 3) {
7827 				err = offset_selection_down(view);
7828 				if (err)
7829 					break;
7830 			}
7831 			free(parent);
7832 		} else if (S_ISDIR(got_tree_entry_get_mode(
7833 		    s->selected_entry))) {
7834 			struct got_tree_object *subtree;
7835 			view->count = 0;
7836 			err = got_object_open_as_tree(&subtree, s->repo,
7837 			    got_tree_entry_get_id(s->selected_entry));
7838 			if (err)
7839 				break;
7840 			err = tree_view_visit_subtree(s, subtree);
7841 			if (err) {
7842 				got_object_tree_close(subtree);
7843 				break;
7844 			}
7845 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7846 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7847 		break;
7848 	case KEY_RESIZE:
7849 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7850 			s->selected = view->nlines - 4;
7851 		view->count = 0;
7852 		break;
7853 	default:
7854 		view->count = 0;
7855 		break;
7856 	}
7857 
7858 	return err;
7859 }
7860 
7861 __dead static void
7862 usage_tree(void)
7863 {
7864 	endwin();
7865 	fprintf(stderr,
7866 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7867 	    getprogname());
7868 	exit(1);
7869 }
7870 
7871 static const struct got_error *
7872 cmd_tree(int argc, char *argv[])
7873 {
7874 	const struct got_error *error;
7875 	struct got_repository *repo = NULL;
7876 	struct got_worktree *worktree = NULL;
7877 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7878 	struct got_object_id *commit_id = NULL;
7879 	struct got_commit_object *commit = NULL;
7880 	const char *commit_id_arg = NULL;
7881 	char *label = NULL;
7882 	struct got_reference *ref = NULL;
7883 	const char *head_ref_name = NULL;
7884 	int ch;
7885 	struct tog_view *view;
7886 	int *pack_fds = NULL;
7887 
7888 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7889 		switch (ch) {
7890 		case 'c':
7891 			commit_id_arg = optarg;
7892 			break;
7893 		case 'r':
7894 			repo_path = realpath(optarg, NULL);
7895 			if (repo_path == NULL)
7896 				return got_error_from_errno2("realpath",
7897 				    optarg);
7898 			break;
7899 		default:
7900 			usage_tree();
7901 			/* NOTREACHED */
7902 		}
7903 	}
7904 
7905 	argc -= optind;
7906 	argv += optind;
7907 
7908 	if (argc > 1)
7909 		usage_tree();
7910 
7911 	error = got_repo_pack_fds_open(&pack_fds);
7912 	if (error != NULL)
7913 		goto done;
7914 
7915 	if (repo_path == NULL) {
7916 		cwd = getcwd(NULL, 0);
7917 		if (cwd == NULL)
7918 			return got_error_from_errno("getcwd");
7919 		error = got_worktree_open(&worktree, cwd);
7920 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7921 			goto done;
7922 		if (worktree)
7923 			repo_path =
7924 			    strdup(got_worktree_get_repo_path(worktree));
7925 		else
7926 			repo_path = strdup(cwd);
7927 		if (repo_path == NULL) {
7928 			error = got_error_from_errno("strdup");
7929 			goto done;
7930 		}
7931 	}
7932 
7933 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7934 	if (error != NULL)
7935 		goto done;
7936 
7937 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7938 	    repo, worktree);
7939 	if (error)
7940 		goto done;
7941 
7942 	init_curses();
7943 
7944 	error = apply_unveil(got_repo_get_path(repo), NULL);
7945 	if (error)
7946 		goto done;
7947 
7948 	error = tog_load_refs(repo, 0);
7949 	if (error)
7950 		goto done;
7951 
7952 	if (commit_id_arg == NULL) {
7953 		error = got_repo_match_object_id(&commit_id, &label,
7954 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7955 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7956 		if (error)
7957 			goto done;
7958 		head_ref_name = label;
7959 	} else {
7960 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7961 		if (error == NULL)
7962 			head_ref_name = got_ref_get_name(ref);
7963 		else if (error->code != GOT_ERR_NOT_REF)
7964 			goto done;
7965 		error = got_repo_match_object_id(&commit_id, NULL,
7966 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7967 		if (error)
7968 			goto done;
7969 	}
7970 
7971 	error = got_object_open_as_commit(&commit, repo, commit_id);
7972 	if (error)
7973 		goto done;
7974 
7975 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7976 	if (view == NULL) {
7977 		error = got_error_from_errno("view_open");
7978 		goto done;
7979 	}
7980 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7981 	if (error)
7982 		goto done;
7983 	if (!got_path_is_root_dir(in_repo_path)) {
7984 		error = tree_view_walk_path(&view->state.tree, commit,
7985 		    in_repo_path);
7986 		if (error)
7987 			goto done;
7988 	}
7989 
7990 	if (worktree) {
7991 		/* Release work tree lock. */
7992 		got_worktree_close(worktree);
7993 		worktree = NULL;
7994 	}
7995 	error = view_loop(view);
7996 done:
7997 	free(repo_path);
7998 	free(cwd);
7999 	free(commit_id);
8000 	free(label);
8001 	if (ref)
8002 		got_ref_close(ref);
8003 	if (repo) {
8004 		const struct got_error *close_err = got_repo_close(repo);
8005 		if (error == NULL)
8006 			error = close_err;
8007 	}
8008 	if (pack_fds) {
8009 		const struct got_error *pack_err =
8010 		    got_repo_pack_fds_close(pack_fds);
8011 		if (error == NULL)
8012 			error = pack_err;
8013 	}
8014 	tog_free_refs();
8015 	return error;
8016 }
8017 
8018 static const struct got_error *
8019 ref_view_load_refs(struct tog_ref_view_state *s)
8020 {
8021 	struct got_reflist_entry *sre;
8022 	struct tog_reflist_entry *re;
8023 
8024 	s->nrefs = 0;
8025 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8026 		if (strncmp(got_ref_get_name(sre->ref),
8027 		    "refs/got/", 9) == 0 &&
8028 		    strncmp(got_ref_get_name(sre->ref),
8029 		    "refs/got/backup/", 16) != 0)
8030 			continue;
8031 
8032 		re = malloc(sizeof(*re));
8033 		if (re == NULL)
8034 			return got_error_from_errno("malloc");
8035 
8036 		re->ref = got_ref_dup(sre->ref);
8037 		if (re->ref == NULL)
8038 			return got_error_from_errno("got_ref_dup");
8039 		re->idx = s->nrefs++;
8040 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8041 	}
8042 
8043 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8044 	return NULL;
8045 }
8046 
8047 static void
8048 ref_view_free_refs(struct tog_ref_view_state *s)
8049 {
8050 	struct tog_reflist_entry *re;
8051 
8052 	while (!TAILQ_EMPTY(&s->refs)) {
8053 		re = TAILQ_FIRST(&s->refs);
8054 		TAILQ_REMOVE(&s->refs, re, entry);
8055 		got_ref_close(re->ref);
8056 		free(re);
8057 	}
8058 }
8059 
8060 static const struct got_error *
8061 open_ref_view(struct tog_view *view, struct got_repository *repo)
8062 {
8063 	const struct got_error *err = NULL;
8064 	struct tog_ref_view_state *s = &view->state.ref;
8065 
8066 	s->selected_entry = 0;
8067 	s->repo = repo;
8068 
8069 	TAILQ_INIT(&s->refs);
8070 	STAILQ_INIT(&s->colors);
8071 
8072 	err = ref_view_load_refs(s);
8073 	if (err)
8074 		goto done;
8075 
8076 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8077 		err = add_color(&s->colors, "^refs/heads/",
8078 		    TOG_COLOR_REFS_HEADS,
8079 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8080 		if (err)
8081 			goto done;
8082 
8083 		err = add_color(&s->colors, "^refs/tags/",
8084 		    TOG_COLOR_REFS_TAGS,
8085 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8086 		if (err)
8087 			goto done;
8088 
8089 		err = add_color(&s->colors, "^refs/remotes/",
8090 		    TOG_COLOR_REFS_REMOTES,
8091 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8092 		if (err)
8093 			goto done;
8094 
8095 		err = add_color(&s->colors, "^refs/got/backup/",
8096 		    TOG_COLOR_REFS_BACKUP,
8097 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8098 		if (err)
8099 			goto done;
8100 	}
8101 
8102 	view->show = show_ref_view;
8103 	view->input = input_ref_view;
8104 	view->close = close_ref_view;
8105 	view->search_start = search_start_ref_view;
8106 	view->search_next = search_next_ref_view;
8107 done:
8108 	if (err) {
8109 		if (view->close == NULL)
8110 			close_ref_view(view);
8111 		view_close(view);
8112 	}
8113 	return err;
8114 }
8115 
8116 static const struct got_error *
8117 close_ref_view(struct tog_view *view)
8118 {
8119 	struct tog_ref_view_state *s = &view->state.ref;
8120 
8121 	ref_view_free_refs(s);
8122 	free_colors(&s->colors);
8123 
8124 	return NULL;
8125 }
8126 
8127 static const struct got_error *
8128 resolve_reflist_entry(struct got_object_id **commit_id,
8129     struct tog_reflist_entry *re, struct got_repository *repo)
8130 {
8131 	const struct got_error *err = NULL;
8132 	struct got_object_id *obj_id;
8133 	struct got_tag_object *tag = NULL;
8134 	int obj_type;
8135 
8136 	*commit_id = NULL;
8137 
8138 	err = got_ref_resolve(&obj_id, repo, re->ref);
8139 	if (err)
8140 		return err;
8141 
8142 	err = got_object_get_type(&obj_type, repo, obj_id);
8143 	if (err)
8144 		goto done;
8145 
8146 	switch (obj_type) {
8147 	case GOT_OBJ_TYPE_COMMIT:
8148 		*commit_id = obj_id;
8149 		break;
8150 	case GOT_OBJ_TYPE_TAG:
8151 		err = got_object_open_as_tag(&tag, repo, obj_id);
8152 		if (err)
8153 			goto done;
8154 		free(obj_id);
8155 		err = got_object_get_type(&obj_type, repo,
8156 		    got_object_tag_get_object_id(tag));
8157 		if (err)
8158 			goto done;
8159 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8160 			err = got_error(GOT_ERR_OBJ_TYPE);
8161 			goto done;
8162 		}
8163 		*commit_id = got_object_id_dup(
8164 		    got_object_tag_get_object_id(tag));
8165 		if (*commit_id == NULL) {
8166 			err = got_error_from_errno("got_object_id_dup");
8167 			goto done;
8168 		}
8169 		break;
8170 	default:
8171 		err = got_error(GOT_ERR_OBJ_TYPE);
8172 		break;
8173 	}
8174 
8175 done:
8176 	if (tag)
8177 		got_object_tag_close(tag);
8178 	if (err) {
8179 		free(*commit_id);
8180 		*commit_id = NULL;
8181 	}
8182 	return err;
8183 }
8184 
8185 static const struct got_error *
8186 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8187     struct tog_reflist_entry *re, struct got_repository *repo)
8188 {
8189 	struct tog_view *log_view;
8190 	const struct got_error *err = NULL;
8191 	struct got_object_id *commit_id = NULL;
8192 
8193 	*new_view = NULL;
8194 
8195 	err = resolve_reflist_entry(&commit_id, re, repo);
8196 	if (err) {
8197 		if (err->code != GOT_ERR_OBJ_TYPE)
8198 			return err;
8199 		else
8200 			return NULL;
8201 	}
8202 
8203 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8204 	if (log_view == NULL) {
8205 		err = got_error_from_errno("view_open");
8206 		goto done;
8207 	}
8208 
8209 	err = open_log_view(log_view, commit_id, repo,
8210 	    got_ref_get_name(re->ref), "", 0);
8211 done:
8212 	if (err)
8213 		view_close(log_view);
8214 	else
8215 		*new_view = log_view;
8216 	free(commit_id);
8217 	return err;
8218 }
8219 
8220 static void
8221 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8222 {
8223 	struct tog_reflist_entry *re;
8224 	int i = 0;
8225 
8226 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8227 		return;
8228 
8229 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8230 	while (i++ < maxscroll) {
8231 		if (re == NULL)
8232 			break;
8233 		s->first_displayed_entry = re;
8234 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8235 	}
8236 }
8237 
8238 static const struct got_error *
8239 ref_scroll_down(struct tog_view *view, int maxscroll)
8240 {
8241 	struct tog_ref_view_state *s = &view->state.ref;
8242 	struct tog_reflist_entry *next, *last;
8243 	int n = 0;
8244 
8245 	if (s->first_displayed_entry)
8246 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8247 	else
8248 		next = TAILQ_FIRST(&s->refs);
8249 
8250 	last = s->last_displayed_entry;
8251 	while (next && n++ < maxscroll) {
8252 		if (last) {
8253 			s->last_displayed_entry = last;
8254 			last = TAILQ_NEXT(last, entry);
8255 		}
8256 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8257 			s->first_displayed_entry = next;
8258 			next = TAILQ_NEXT(next, entry);
8259 		}
8260 	}
8261 
8262 	return NULL;
8263 }
8264 
8265 static const struct got_error *
8266 search_start_ref_view(struct tog_view *view)
8267 {
8268 	struct tog_ref_view_state *s = &view->state.ref;
8269 
8270 	s->matched_entry = NULL;
8271 	return NULL;
8272 }
8273 
8274 static int
8275 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8276 {
8277 	regmatch_t regmatch;
8278 
8279 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8280 	    0) == 0;
8281 }
8282 
8283 static const struct got_error *
8284 search_next_ref_view(struct tog_view *view)
8285 {
8286 	struct tog_ref_view_state *s = &view->state.ref;
8287 	struct tog_reflist_entry *re = NULL;
8288 
8289 	if (!view->searching) {
8290 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8291 		return NULL;
8292 	}
8293 
8294 	if (s->matched_entry) {
8295 		if (view->searching == TOG_SEARCH_FORWARD) {
8296 			if (s->selected_entry)
8297 				re = TAILQ_NEXT(s->selected_entry, entry);
8298 			else
8299 				re = TAILQ_PREV(s->selected_entry,
8300 				    tog_reflist_head, entry);
8301 		} else {
8302 			if (s->selected_entry == NULL)
8303 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8304 			else
8305 				re = TAILQ_PREV(s->selected_entry,
8306 				    tog_reflist_head, entry);
8307 		}
8308 	} else {
8309 		if (s->selected_entry)
8310 			re = s->selected_entry;
8311 		else if (view->searching == TOG_SEARCH_FORWARD)
8312 			re = TAILQ_FIRST(&s->refs);
8313 		else
8314 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8315 	}
8316 
8317 	while (1) {
8318 		if (re == NULL) {
8319 			if (s->matched_entry == NULL) {
8320 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8321 				return NULL;
8322 			}
8323 			if (view->searching == TOG_SEARCH_FORWARD)
8324 				re = TAILQ_FIRST(&s->refs);
8325 			else
8326 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8327 		}
8328 
8329 		if (match_reflist_entry(re, &view->regex)) {
8330 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8331 			s->matched_entry = re;
8332 			break;
8333 		}
8334 
8335 		if (view->searching == TOG_SEARCH_FORWARD)
8336 			re = TAILQ_NEXT(re, entry);
8337 		else
8338 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8339 	}
8340 
8341 	if (s->matched_entry) {
8342 		s->first_displayed_entry = s->matched_entry;
8343 		s->selected = 0;
8344 	}
8345 
8346 	return NULL;
8347 }
8348 
8349 static const struct got_error *
8350 show_ref_view(struct tog_view *view)
8351 {
8352 	const struct got_error *err = NULL;
8353 	struct tog_ref_view_state *s = &view->state.ref;
8354 	struct tog_reflist_entry *re;
8355 	char *line = NULL;
8356 	wchar_t *wline;
8357 	struct tog_color *tc;
8358 	int width, n, scrollx;
8359 	int limit = view->nlines;
8360 
8361 	werase(view->window);
8362 
8363 	s->ndisplayed = 0;
8364 	if (view_is_hsplit_top(view))
8365 		--limit;  /* border */
8366 
8367 	if (limit == 0)
8368 		return NULL;
8369 
8370 	re = s->first_displayed_entry;
8371 
8372 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8373 	    s->nrefs) == -1)
8374 		return got_error_from_errno("asprintf");
8375 
8376 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8377 	if (err) {
8378 		free(line);
8379 		return err;
8380 	}
8381 	if (view_needs_focus_indication(view))
8382 		wstandout(view->window);
8383 	waddwstr(view->window, wline);
8384 	while (width++ < view->ncols)
8385 		waddch(view->window, ' ');
8386 	if (view_needs_focus_indication(view))
8387 		wstandend(view->window);
8388 	free(wline);
8389 	wline = NULL;
8390 	free(line);
8391 	line = NULL;
8392 	if (--limit <= 0)
8393 		return NULL;
8394 
8395 	n = 0;
8396 	view->maxx = 0;
8397 	while (re && limit > 0) {
8398 		char *line = NULL;
8399 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8400 
8401 		if (s->show_date) {
8402 			struct got_commit_object *ci;
8403 			struct got_tag_object *tag;
8404 			struct got_object_id *id;
8405 			struct tm tm;
8406 			time_t t;
8407 
8408 			err = got_ref_resolve(&id, s->repo, re->ref);
8409 			if (err)
8410 				return err;
8411 			err = got_object_open_as_tag(&tag, s->repo, id);
8412 			if (err) {
8413 				if (err->code != GOT_ERR_OBJ_TYPE) {
8414 					free(id);
8415 					return err;
8416 				}
8417 				err = got_object_open_as_commit(&ci, s->repo,
8418 				    id);
8419 				if (err) {
8420 					free(id);
8421 					return err;
8422 				}
8423 				t = got_object_commit_get_committer_time(ci);
8424 				got_object_commit_close(ci);
8425 			} else {
8426 				t = got_object_tag_get_tagger_time(tag);
8427 				got_object_tag_close(tag);
8428 			}
8429 			free(id);
8430 			if (gmtime_r(&t, &tm) == NULL)
8431 				return got_error_from_errno("gmtime_r");
8432 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8433 				return got_error(GOT_ERR_NO_SPACE);
8434 		}
8435 		if (got_ref_is_symbolic(re->ref)) {
8436 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8437 			    ymd : "", got_ref_get_name(re->ref),
8438 			    got_ref_get_symref_target(re->ref)) == -1)
8439 				return got_error_from_errno("asprintf");
8440 		} else if (s->show_ids) {
8441 			struct got_object_id *id;
8442 			char *id_str;
8443 			err = got_ref_resolve(&id, s->repo, re->ref);
8444 			if (err)
8445 				return err;
8446 			err = got_object_id_str(&id_str, id);
8447 			if (err) {
8448 				free(id);
8449 				return err;
8450 			}
8451 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8452 			    got_ref_get_name(re->ref), id_str) == -1) {
8453 				err = got_error_from_errno("asprintf");
8454 				free(id);
8455 				free(id_str);
8456 				return err;
8457 			}
8458 			free(id);
8459 			free(id_str);
8460 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8461 		    got_ref_get_name(re->ref)) == -1)
8462 			return got_error_from_errno("asprintf");
8463 
8464 		/* use full line width to determine view->maxx */
8465 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8466 		if (err) {
8467 			free(line);
8468 			return err;
8469 		}
8470 		view->maxx = MAX(view->maxx, width);
8471 		free(wline);
8472 		wline = NULL;
8473 
8474 		err = format_line(&wline, &width, &scrollx, line, view->x,
8475 		    view->ncols, 0, 0);
8476 		if (err) {
8477 			free(line);
8478 			return err;
8479 		}
8480 		if (n == s->selected) {
8481 			if (view->focussed)
8482 				wstandout(view->window);
8483 			s->selected_entry = re;
8484 		}
8485 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8486 		if (tc)
8487 			wattr_on(view->window,
8488 			    COLOR_PAIR(tc->colorpair), NULL);
8489 		waddwstr(view->window, &wline[scrollx]);
8490 		if (tc)
8491 			wattr_off(view->window,
8492 			    COLOR_PAIR(tc->colorpair), NULL);
8493 		if (width < view->ncols)
8494 			waddch(view->window, '\n');
8495 		if (n == s->selected && view->focussed)
8496 			wstandend(view->window);
8497 		free(line);
8498 		free(wline);
8499 		wline = NULL;
8500 		n++;
8501 		s->ndisplayed++;
8502 		s->last_displayed_entry = re;
8503 
8504 		limit--;
8505 		re = TAILQ_NEXT(re, entry);
8506 	}
8507 
8508 	view_border(view);
8509 	return err;
8510 }
8511 
8512 static const struct got_error *
8513 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8514     struct tog_reflist_entry *re, struct got_repository *repo)
8515 {
8516 	const struct got_error *err = NULL;
8517 	struct got_object_id *commit_id = NULL;
8518 	struct tog_view *tree_view;
8519 
8520 	*new_view = NULL;
8521 
8522 	err = resolve_reflist_entry(&commit_id, re, repo);
8523 	if (err) {
8524 		if (err->code != GOT_ERR_OBJ_TYPE)
8525 			return err;
8526 		else
8527 			return NULL;
8528 	}
8529 
8530 
8531 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8532 	if (tree_view == NULL) {
8533 		err = got_error_from_errno("view_open");
8534 		goto done;
8535 	}
8536 
8537 	err = open_tree_view(tree_view, commit_id,
8538 	    got_ref_get_name(re->ref), repo);
8539 	if (err)
8540 		goto done;
8541 
8542 	*new_view = tree_view;
8543 done:
8544 	free(commit_id);
8545 	return err;
8546 }
8547 
8548 static const struct got_error *
8549 ref_goto_line(struct tog_view *view, int nlines)
8550 {
8551 	const struct got_error		*err = NULL;
8552 	struct tog_ref_view_state	*s = &view->state.ref;
8553 	int				 g, idx = s->selected_entry->idx;
8554 
8555 	g = view->gline;
8556 	view->gline = 0;
8557 
8558 	if (g == 0)
8559 		g = 1;
8560 	else if (g > s->nrefs)
8561 		g = s->nrefs;
8562 
8563 	if (g >= s->first_displayed_entry->idx + 1 &&
8564 	    g <= s->last_displayed_entry->idx + 1 &&
8565 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8566 		s->selected = g - s->first_displayed_entry->idx - 1;
8567 		return NULL;
8568 	}
8569 
8570 	if (idx + 1 < g) {
8571 		err = ref_scroll_down(view, g - idx - 1);
8572 		if (err)
8573 			return err;
8574 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8575 		    s->first_displayed_entry->idx + s->selected < g &&
8576 		    s->selected < s->ndisplayed - 1)
8577 			s->selected = g - s->first_displayed_entry->idx - 1;
8578 	} else if (idx + 1 > g)
8579 		ref_scroll_up(s, idx - g + 1);
8580 
8581 	if (g < nlines && s->first_displayed_entry->idx == 0)
8582 		s->selected = g - 1;
8583 
8584 	return NULL;
8585 
8586 }
8587 
8588 static const struct got_error *
8589 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8590 {
8591 	const struct got_error *err = NULL;
8592 	struct tog_ref_view_state *s = &view->state.ref;
8593 	struct tog_reflist_entry *re;
8594 	int n, nscroll = view->nlines - 1;
8595 
8596 	if (view->gline)
8597 		return ref_goto_line(view, nscroll);
8598 
8599 	switch (ch) {
8600 	case '0':
8601 	case '$':
8602 	case KEY_RIGHT:
8603 	case 'l':
8604 	case KEY_LEFT:
8605 	case 'h':
8606 		horizontal_scroll_input(view, ch);
8607 		break;
8608 	case 'i':
8609 		s->show_ids = !s->show_ids;
8610 		view->count = 0;
8611 		break;
8612 	case 'm':
8613 		s->show_date = !s->show_date;
8614 		view->count = 0;
8615 		break;
8616 	case 'o':
8617 		s->sort_by_date = !s->sort_by_date;
8618 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8619 		view->count = 0;
8620 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8621 		    got_ref_cmp_by_commit_timestamp_descending :
8622 		    tog_ref_cmp_by_name, s->repo);
8623 		if (err)
8624 			break;
8625 		got_reflist_object_id_map_free(tog_refs_idmap);
8626 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8627 		    &tog_refs, s->repo);
8628 		if (err)
8629 			break;
8630 		ref_view_free_refs(s);
8631 		err = ref_view_load_refs(s);
8632 		break;
8633 	case KEY_ENTER:
8634 	case '\r':
8635 		view->count = 0;
8636 		if (!s->selected_entry)
8637 			break;
8638 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8639 		break;
8640 	case 'T':
8641 		view->count = 0;
8642 		if (!s->selected_entry)
8643 			break;
8644 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8645 		break;
8646 	case 'g':
8647 	case '=':
8648 	case KEY_HOME:
8649 		s->selected = 0;
8650 		view->count = 0;
8651 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8652 		break;
8653 	case 'G':
8654 	case '*':
8655 	case KEY_END: {
8656 		int eos = view->nlines - 1;
8657 
8658 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8659 			--eos;  /* border */
8660 		s->selected = 0;
8661 		view->count = 0;
8662 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8663 		for (n = 0; n < eos; n++) {
8664 			if (re == NULL)
8665 				break;
8666 			s->first_displayed_entry = re;
8667 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8668 		}
8669 		if (n > 0)
8670 			s->selected = n - 1;
8671 		break;
8672 	}
8673 	case 'k':
8674 	case KEY_UP:
8675 	case CTRL('p'):
8676 		if (s->selected > 0) {
8677 			s->selected--;
8678 			break;
8679 		}
8680 		ref_scroll_up(s, 1);
8681 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8682 			view->count = 0;
8683 		break;
8684 	case CTRL('u'):
8685 	case 'u':
8686 		nscroll /= 2;
8687 		/* FALL THROUGH */
8688 	case KEY_PPAGE:
8689 	case CTRL('b'):
8690 	case 'b':
8691 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8692 			s->selected -= MIN(nscroll, s->selected);
8693 		ref_scroll_up(s, MAX(0, nscroll));
8694 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8695 			view->count = 0;
8696 		break;
8697 	case 'j':
8698 	case KEY_DOWN:
8699 	case CTRL('n'):
8700 		if (s->selected < s->ndisplayed - 1) {
8701 			s->selected++;
8702 			break;
8703 		}
8704 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8705 			/* can't scroll any further */
8706 			view->count = 0;
8707 			break;
8708 		}
8709 		ref_scroll_down(view, 1);
8710 		break;
8711 	case CTRL('d'):
8712 	case 'd':
8713 		nscroll /= 2;
8714 		/* FALL THROUGH */
8715 	case KEY_NPAGE:
8716 	case CTRL('f'):
8717 	case 'f':
8718 	case ' ':
8719 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8720 			/* can't scroll any further; move cursor down */
8721 			if (s->selected < s->ndisplayed - 1)
8722 				s->selected += MIN(nscroll,
8723 				    s->ndisplayed - s->selected - 1);
8724 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8725 				s->selected += s->ndisplayed - s->selected - 1;
8726 			view->count = 0;
8727 			break;
8728 		}
8729 		ref_scroll_down(view, nscroll);
8730 		break;
8731 	case CTRL('l'):
8732 		view->count = 0;
8733 		tog_free_refs();
8734 		err = tog_load_refs(s->repo, s->sort_by_date);
8735 		if (err)
8736 			break;
8737 		ref_view_free_refs(s);
8738 		err = ref_view_load_refs(s);
8739 		break;
8740 	case KEY_RESIZE:
8741 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8742 			s->selected = view->nlines - 2;
8743 		break;
8744 	default:
8745 		view->count = 0;
8746 		break;
8747 	}
8748 
8749 	return err;
8750 }
8751 
8752 __dead static void
8753 usage_ref(void)
8754 {
8755 	endwin();
8756 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8757 	    getprogname());
8758 	exit(1);
8759 }
8760 
8761 static const struct got_error *
8762 cmd_ref(int argc, char *argv[])
8763 {
8764 	const struct got_error *error;
8765 	struct got_repository *repo = NULL;
8766 	struct got_worktree *worktree = NULL;
8767 	char *cwd = NULL, *repo_path = NULL;
8768 	int ch;
8769 	struct tog_view *view;
8770 	int *pack_fds = NULL;
8771 
8772 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8773 		switch (ch) {
8774 		case 'r':
8775 			repo_path = realpath(optarg, NULL);
8776 			if (repo_path == NULL)
8777 				return got_error_from_errno2("realpath",
8778 				    optarg);
8779 			break;
8780 		default:
8781 			usage_ref();
8782 			/* NOTREACHED */
8783 		}
8784 	}
8785 
8786 	argc -= optind;
8787 	argv += optind;
8788 
8789 	if (argc > 1)
8790 		usage_ref();
8791 
8792 	error = got_repo_pack_fds_open(&pack_fds);
8793 	if (error != NULL)
8794 		goto done;
8795 
8796 	if (repo_path == NULL) {
8797 		cwd = getcwd(NULL, 0);
8798 		if (cwd == NULL)
8799 			return got_error_from_errno("getcwd");
8800 		error = got_worktree_open(&worktree, cwd);
8801 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8802 			goto done;
8803 		if (worktree)
8804 			repo_path =
8805 			    strdup(got_worktree_get_repo_path(worktree));
8806 		else
8807 			repo_path = strdup(cwd);
8808 		if (repo_path == NULL) {
8809 			error = got_error_from_errno("strdup");
8810 			goto done;
8811 		}
8812 	}
8813 
8814 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8815 	if (error != NULL)
8816 		goto done;
8817 
8818 	init_curses();
8819 
8820 	error = apply_unveil(got_repo_get_path(repo), NULL);
8821 	if (error)
8822 		goto done;
8823 
8824 	error = tog_load_refs(repo, 0);
8825 	if (error)
8826 		goto done;
8827 
8828 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8829 	if (view == NULL) {
8830 		error = got_error_from_errno("view_open");
8831 		goto done;
8832 	}
8833 
8834 	error = open_ref_view(view, repo);
8835 	if (error)
8836 		goto done;
8837 
8838 	if (worktree) {
8839 		/* Release work tree lock. */
8840 		got_worktree_close(worktree);
8841 		worktree = NULL;
8842 	}
8843 	error = view_loop(view);
8844 done:
8845 	free(repo_path);
8846 	free(cwd);
8847 	if (repo) {
8848 		const struct got_error *close_err = got_repo_close(repo);
8849 		if (close_err)
8850 			error = close_err;
8851 	}
8852 	if (pack_fds) {
8853 		const struct got_error *pack_err =
8854 		    got_repo_pack_fds_close(pack_fds);
8855 		if (error == NULL)
8856 			error = pack_err;
8857 	}
8858 	tog_free_refs();
8859 	return error;
8860 }
8861 
8862 static const struct got_error*
8863 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8864     const char *str)
8865 {
8866 	size_t len;
8867 
8868 	if (win == NULL)
8869 		win = stdscr;
8870 
8871 	len = strlen(str);
8872 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8873 
8874 	if (focus)
8875 		wstandout(win);
8876 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8877 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8878 	if (focus)
8879 		wstandend(win);
8880 
8881 	return NULL;
8882 }
8883 
8884 static const struct got_error *
8885 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8886 {
8887 	off_t *p;
8888 
8889 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8890 	if (p == NULL) {
8891 		free(*line_offsets);
8892 		*line_offsets = NULL;
8893 		return got_error_from_errno("reallocarray");
8894 	}
8895 
8896 	*line_offsets = p;
8897 	(*line_offsets)[*nlines] = off;
8898 	++(*nlines);
8899 	return NULL;
8900 }
8901 
8902 static const struct got_error *
8903 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8904 {
8905 	*ret = 0;
8906 
8907 	for (;n > 0; --n, ++km) {
8908 		char	*t0, *t, *k;
8909 		size_t	 len = 1;
8910 
8911 		if (km->keys == NULL)
8912 			continue;
8913 
8914 		t = t0 = strdup(km->keys);
8915 		if (t0 == NULL)
8916 			return got_error_from_errno("strdup");
8917 
8918 		len += strlen(t);
8919 		while ((k = strsep(&t, " ")) != NULL)
8920 			len += strlen(k) > 1 ? 2 : 0;
8921 		free(t0);
8922 		*ret = MAX(*ret, len);
8923 	}
8924 
8925 	return NULL;
8926 }
8927 
8928 /*
8929  * Write keymap section headers, keys, and key info in km to f.
8930  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8931  * wrap control and symbolic keys in guillemets, else use <>.
8932  */
8933 static const struct got_error *
8934 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8935 {
8936 	int n, len = width;
8937 
8938 	if (km->keys) {
8939 		static const char *u8_glyph[] = {
8940 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8941 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8942 		};
8943 		char	*t0, *t, *k;
8944 		int	 cs, s, first = 1;
8945 
8946 		cs = got_locale_is_utf8();
8947 
8948 		t = t0 = strdup(km->keys);
8949 		if (t0 == NULL)
8950 			return got_error_from_errno("strdup");
8951 
8952 		len = strlen(km->keys);
8953 		while ((k = strsep(&t, " ")) != NULL) {
8954 			s = strlen(k) > 1;  /* control or symbolic key */
8955 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8956 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8957 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8958 			if (n < 0) {
8959 				free(t0);
8960 				return got_error_from_errno("fprintf");
8961 			}
8962 			first = 0;
8963 			len += s ? 2 : 0;
8964 			*off += n;
8965 		}
8966 		free(t0);
8967 	}
8968 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8969 	if (n < 0)
8970 		return got_error_from_errno("fprintf");
8971 	*off += n;
8972 
8973 	return NULL;
8974 }
8975 
8976 static const struct got_error *
8977 format_help(struct tog_help_view_state *s)
8978 {
8979 	const struct got_error		*err = NULL;
8980 	off_t				 off = 0;
8981 	int				 i, max, n, show = s->all;
8982 	static const struct tog_key_map	 km[] = {
8983 #define KEYMAP_(info, type)	{ NULL, (info), type }
8984 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8985 		GENERATE_HELP
8986 #undef KEYMAP_
8987 #undef KEY_
8988 	};
8989 
8990 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8991 	if (err)
8992 		return err;
8993 
8994 	n = nitems(km);
8995 	err = max_key_str(&max, km, n);
8996 	if (err)
8997 		return err;
8998 
8999 	for (i = 0; i < n; ++i) {
9000 		if (km[i].keys == NULL) {
9001 			show = s->all;
9002 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9003 			    km[i].type == s->type || s->all)
9004 				show = 1;
9005 		}
9006 		if (show) {
9007 			err = format_help_line(&off, s->f, &km[i], max);
9008 			if (err)
9009 				return err;
9010 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9011 			if (err)
9012 				return err;
9013 		}
9014 	}
9015 	fputc('\n', s->f);
9016 	++off;
9017 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9018 	return err;
9019 }
9020 
9021 static const struct got_error *
9022 create_help(struct tog_help_view_state *s)
9023 {
9024 	FILE			*f;
9025 	const struct got_error	*err;
9026 
9027 	free(s->line_offsets);
9028 	s->line_offsets = NULL;
9029 	s->nlines = 0;
9030 
9031 	f = got_opentemp();
9032 	if (f == NULL)
9033 		return got_error_from_errno("got_opentemp");
9034 	s->f = f;
9035 
9036 	err = format_help(s);
9037 	if (err)
9038 		return err;
9039 
9040 	if (s->f && fflush(s->f) != 0)
9041 		return got_error_from_errno("fflush");
9042 
9043 	return NULL;
9044 }
9045 
9046 static const struct got_error *
9047 search_start_help_view(struct tog_view *view)
9048 {
9049 	view->state.help.matched_line = 0;
9050 	return NULL;
9051 }
9052 
9053 static void
9054 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9055     size_t *nlines, int **first, int **last, int **match, int **selected)
9056 {
9057 	struct tog_help_view_state *s = &view->state.help;
9058 
9059 	*f = s->f;
9060 	*nlines = s->nlines;
9061 	*line_offsets = s->line_offsets;
9062 	*match = &s->matched_line;
9063 	*first = &s->first_displayed_line;
9064 	*last = &s->last_displayed_line;
9065 	*selected = &s->selected_line;
9066 }
9067 
9068 static const struct got_error *
9069 show_help_view(struct tog_view *view)
9070 {
9071 	struct tog_help_view_state	*s = &view->state.help;
9072 	const struct got_error		*err;
9073 	regmatch_t			*regmatch = &view->regmatch;
9074 	wchar_t				*wline;
9075 	char				*line;
9076 	ssize_t				 linelen;
9077 	size_t				 linesz = 0;
9078 	int				 width, nprinted = 0, rc = 0;
9079 	int				 eos = view->nlines;
9080 
9081 	if (view_is_hsplit_top(view))
9082 		--eos;  /* account for border */
9083 
9084 	s->lineno = 0;
9085 	rewind(s->f);
9086 	werase(view->window);
9087 
9088 	if (view->gline > s->nlines - 1)
9089 		view->gline = s->nlines - 1;
9090 
9091 	err = win_draw_center(view->window, 0, 0, view->ncols,
9092 	    view_needs_focus_indication(view),
9093 	    "tog help (press q to return to tog)");
9094 	if (err)
9095 		return err;
9096 	if (eos <= 1)
9097 		return NULL;
9098 	waddstr(view->window, "\n\n");
9099 	eos -= 2;
9100 
9101 	s->eof = 0;
9102 	view->maxx = 0;
9103 	line = NULL;
9104 	while (eos > 0 && nprinted < eos) {
9105 		attr_t attr = 0;
9106 
9107 		linelen = getline(&line, &linesz, s->f);
9108 		if (linelen == -1) {
9109 			if (!feof(s->f)) {
9110 				free(line);
9111 				return got_ferror(s->f, GOT_ERR_IO);
9112 			}
9113 			s->eof = 1;
9114 			break;
9115 		}
9116 		if (++s->lineno < s->first_displayed_line)
9117 			continue;
9118 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9119 			continue;
9120 		if (s->lineno == view->hiline)
9121 			attr = A_STANDOUT;
9122 
9123 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9124 		    view->x ? 1 : 0);
9125 		if (err) {
9126 			free(line);
9127 			return err;
9128 		}
9129 		view->maxx = MAX(view->maxx, width);
9130 		free(wline);
9131 		wline = NULL;
9132 
9133 		if (attr)
9134 			wattron(view->window, attr);
9135 		if (s->first_displayed_line + nprinted == s->matched_line &&
9136 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9137 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9138 			    view->window, view->x, regmatch);
9139 			if (err) {
9140 				free(line);
9141 				return err;
9142 			}
9143 		} else {
9144 			int skip;
9145 
9146 			err = format_line(&wline, &width, &skip, line,
9147 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9148 			if (err) {
9149 				free(line);
9150 				return err;
9151 			}
9152 			waddwstr(view->window, &wline[skip]);
9153 			free(wline);
9154 			wline = NULL;
9155 		}
9156 		if (s->lineno == view->hiline) {
9157 			while (width++ < view->ncols)
9158 				waddch(view->window, ' ');
9159 		} else {
9160 			if (width < view->ncols)
9161 				waddch(view->window, '\n');
9162 		}
9163 		if (attr)
9164 			wattroff(view->window, attr);
9165 		if (++nprinted == 1)
9166 			s->first_displayed_line = s->lineno;
9167 	}
9168 	free(line);
9169 	if (nprinted > 0)
9170 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9171 	else
9172 		s->last_displayed_line = s->first_displayed_line;
9173 
9174 	view_border(view);
9175 
9176 	if (s->eof) {
9177 		rc = waddnstr(view->window,
9178 		    "See the tog(1) manual page for full documentation",
9179 		    view->ncols - 1);
9180 		if (rc == ERR)
9181 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9182 	} else {
9183 		wmove(view->window, view->nlines - 1, 0);
9184 		wclrtoeol(view->window);
9185 		wstandout(view->window);
9186 		rc = waddnstr(view->window, "scroll down for more...",
9187 		    view->ncols - 1);
9188 		if (rc == ERR)
9189 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9190 		if (getcurx(view->window) < view->ncols - 6) {
9191 			rc = wprintw(view->window, "[%.0f%%]",
9192 			    100.00 * s->last_displayed_line / s->nlines);
9193 			if (rc == ERR)
9194 				return got_error_msg(GOT_ERR_IO, "wprintw");
9195 		}
9196 		wstandend(view->window);
9197 	}
9198 
9199 	return NULL;
9200 }
9201 
9202 static const struct got_error *
9203 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9204 {
9205 	struct tog_help_view_state	*s = &view->state.help;
9206 	const struct got_error		*err = NULL;
9207 	char				*line = NULL;
9208 	ssize_t				 linelen;
9209 	size_t				 linesz = 0;
9210 	int				 eos, nscroll;
9211 
9212 	eos = nscroll = view->nlines;
9213 	if (view_is_hsplit_top(view))
9214 		--eos;  /* border */
9215 
9216 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9217 
9218 	switch (ch) {
9219 	case '0':
9220 	case '$':
9221 	case KEY_RIGHT:
9222 	case 'l':
9223 	case KEY_LEFT:
9224 	case 'h':
9225 		horizontal_scroll_input(view, ch);
9226 		break;
9227 	case 'g':
9228 	case KEY_HOME:
9229 		s->first_displayed_line = 1;
9230 		view->count = 0;
9231 		break;
9232 	case 'G':
9233 	case KEY_END:
9234 		view->count = 0;
9235 		if (s->eof)
9236 			break;
9237 		s->first_displayed_line = (s->nlines - eos) + 3;
9238 		s->eof = 1;
9239 		break;
9240 	case 'k':
9241 	case KEY_UP:
9242 		if (s->first_displayed_line > 1)
9243 			--s->first_displayed_line;
9244 		else
9245 			view->count = 0;
9246 		break;
9247 	case CTRL('u'):
9248 	case 'u':
9249 		nscroll /= 2;
9250 		/* FALL THROUGH */
9251 	case KEY_PPAGE:
9252 	case CTRL('b'):
9253 	case 'b':
9254 		if (s->first_displayed_line == 1) {
9255 			view->count = 0;
9256 			break;
9257 		}
9258 		while (--nscroll > 0 && s->first_displayed_line > 1)
9259 			s->first_displayed_line--;
9260 		break;
9261 	case 'j':
9262 	case KEY_DOWN:
9263 	case CTRL('n'):
9264 		if (!s->eof)
9265 			++s->first_displayed_line;
9266 		else
9267 			view->count = 0;
9268 		break;
9269 	case CTRL('d'):
9270 	case 'd':
9271 		nscroll /= 2;
9272 		/* FALL THROUGH */
9273 	case KEY_NPAGE:
9274 	case CTRL('f'):
9275 	case 'f':
9276 	case ' ':
9277 		if (s->eof) {
9278 			view->count = 0;
9279 			break;
9280 		}
9281 		while (!s->eof && --nscroll > 0) {
9282 			linelen = getline(&line, &linesz, s->f);
9283 			s->first_displayed_line++;
9284 			if (linelen == -1) {
9285 				if (feof(s->f))
9286 					s->eof = 1;
9287 				else
9288 					err = got_ferror(s->f, GOT_ERR_IO);
9289 				break;
9290 			}
9291 		}
9292 		free(line);
9293 		break;
9294 	default:
9295 		view->count = 0;
9296 		break;
9297 	}
9298 
9299 	return err;
9300 }
9301 
9302 static const struct got_error *
9303 close_help_view(struct tog_view *view)
9304 {
9305 	struct tog_help_view_state *s = &view->state.help;
9306 
9307 	free(s->line_offsets);
9308 	s->line_offsets = NULL;
9309 	if (fclose(s->f) == EOF)
9310 		return got_error_from_errno("fclose");
9311 
9312 	return NULL;
9313 }
9314 
9315 static const struct got_error *
9316 reset_help_view(struct tog_view *view)
9317 {
9318 	struct tog_help_view_state *s = &view->state.help;
9319 
9320 
9321 	if (s->f && fclose(s->f) == EOF)
9322 		return got_error_from_errno("fclose");
9323 
9324 	wclear(view->window);
9325 	view->count = 0;
9326 	view->x = 0;
9327 	s->all = !s->all;
9328 	s->first_displayed_line = 1;
9329 	s->last_displayed_line = view->nlines;
9330 	s->matched_line = 0;
9331 
9332 	return create_help(s);
9333 }
9334 
9335 static const struct got_error *
9336 open_help_view(struct tog_view *view, struct tog_view *parent)
9337 {
9338 	const struct got_error		*err = NULL;
9339 	struct tog_help_view_state	*s = &view->state.help;
9340 
9341 	s->type = (enum tog_keymap_type)parent->type;
9342 	s->first_displayed_line = 1;
9343 	s->last_displayed_line = view->nlines;
9344 	s->selected_line = 1;
9345 
9346 	view->show = show_help_view;
9347 	view->input = input_help_view;
9348 	view->reset = reset_help_view;
9349 	view->close = close_help_view;
9350 	view->search_start = search_start_help_view;
9351 	view->search_setup = search_setup_help_view;
9352 	view->search_next = search_next_view_match;
9353 
9354 	err = create_help(s);
9355 	return err;
9356 }
9357 
9358 static const struct got_error *
9359 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9360     enum tog_view_type request, int y, int x)
9361 {
9362 	const struct got_error *err = NULL;
9363 
9364 	*new_view = NULL;
9365 
9366 	switch (request) {
9367 	case TOG_VIEW_DIFF:
9368 		if (view->type == TOG_VIEW_LOG) {
9369 			struct tog_log_view_state *s = &view->state.log;
9370 
9371 			err = open_diff_view_for_commit(new_view, y, x,
9372 			    s->selected_entry->commit, s->selected_entry->id,
9373 			    view, s->repo);
9374 		} else
9375 			return got_error_msg(GOT_ERR_NOT_IMPL,
9376 			    "parent/child view pair not supported");
9377 		break;
9378 	case TOG_VIEW_BLAME:
9379 		if (view->type == TOG_VIEW_TREE) {
9380 			struct tog_tree_view_state *s = &view->state.tree;
9381 
9382 			err = blame_tree_entry(new_view, y, x,
9383 			    s->selected_entry, &s->parents, s->commit_id,
9384 			    s->repo);
9385 		} else
9386 			return got_error_msg(GOT_ERR_NOT_IMPL,
9387 			    "parent/child view pair not supported");
9388 		break;
9389 	case TOG_VIEW_LOG:
9390 		if (view->type == TOG_VIEW_BLAME)
9391 			err = log_annotated_line(new_view, y, x,
9392 			    view->state.blame.repo, view->state.blame.id_to_log);
9393 		else if (view->type == TOG_VIEW_TREE)
9394 			err = log_selected_tree_entry(new_view, y, x,
9395 			    &view->state.tree);
9396 		else if (view->type == TOG_VIEW_REF)
9397 			err = log_ref_entry(new_view, y, x,
9398 			    view->state.ref.selected_entry,
9399 			    view->state.ref.repo);
9400 		else
9401 			return got_error_msg(GOT_ERR_NOT_IMPL,
9402 			    "parent/child view pair not supported");
9403 		break;
9404 	case TOG_VIEW_TREE:
9405 		if (view->type == TOG_VIEW_LOG)
9406 			err = browse_commit_tree(new_view, y, x,
9407 			    view->state.log.selected_entry,
9408 			    view->state.log.in_repo_path,
9409 			    view->state.log.head_ref_name,
9410 			    view->state.log.repo);
9411 		else if (view->type == TOG_VIEW_REF)
9412 			err = browse_ref_tree(new_view, y, x,
9413 			    view->state.ref.selected_entry,
9414 			    view->state.ref.repo);
9415 		else
9416 			return got_error_msg(GOT_ERR_NOT_IMPL,
9417 			    "parent/child view pair not supported");
9418 		break;
9419 	case TOG_VIEW_REF:
9420 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9421 		if (*new_view == NULL)
9422 			return got_error_from_errno("view_open");
9423 		if (view->type == TOG_VIEW_LOG)
9424 			err = open_ref_view(*new_view, view->state.log.repo);
9425 		else if (view->type == TOG_VIEW_TREE)
9426 			err = open_ref_view(*new_view, view->state.tree.repo);
9427 		else
9428 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9429 			    "parent/child view pair not supported");
9430 		if (err)
9431 			view_close(*new_view);
9432 		break;
9433 	case TOG_VIEW_HELP:
9434 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9435 		if (*new_view == NULL)
9436 			return got_error_from_errno("view_open");
9437 		err = open_help_view(*new_view, view);
9438 		if (err)
9439 			view_close(*new_view);
9440 		break;
9441 	default:
9442 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9443 	}
9444 
9445 	return err;
9446 }
9447 
9448 /*
9449  * If view was scrolled down to move the selected line into view when opening a
9450  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9451  */
9452 static void
9453 offset_selection_up(struct tog_view *view)
9454 {
9455 	switch (view->type) {
9456 	case TOG_VIEW_BLAME: {
9457 		struct tog_blame_view_state *s = &view->state.blame;
9458 		if (s->first_displayed_line == 1) {
9459 			s->selected_line = MAX(s->selected_line - view->offset,
9460 			    1);
9461 			break;
9462 		}
9463 		if (s->first_displayed_line > view->offset)
9464 			s->first_displayed_line -= view->offset;
9465 		else
9466 			s->first_displayed_line = 1;
9467 		s->selected_line += view->offset;
9468 		break;
9469 	}
9470 	case TOG_VIEW_LOG:
9471 		log_scroll_up(&view->state.log, view->offset);
9472 		view->state.log.selected += view->offset;
9473 		break;
9474 	case TOG_VIEW_REF:
9475 		ref_scroll_up(&view->state.ref, view->offset);
9476 		view->state.ref.selected += view->offset;
9477 		break;
9478 	case TOG_VIEW_TREE:
9479 		tree_scroll_up(&view->state.tree, view->offset);
9480 		view->state.tree.selected += view->offset;
9481 		break;
9482 	default:
9483 		break;
9484 	}
9485 
9486 	view->offset = 0;
9487 }
9488 
9489 /*
9490  * If the selected line is in the section of screen covered by the bottom split,
9491  * scroll down offset lines to move it into view and index its new position.
9492  */
9493 static const struct got_error *
9494 offset_selection_down(struct tog_view *view)
9495 {
9496 	const struct got_error	*err = NULL;
9497 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9498 	int			*selected = NULL;
9499 	int			 header, offset;
9500 
9501 	switch (view->type) {
9502 	case TOG_VIEW_BLAME: {
9503 		struct tog_blame_view_state *s = &view->state.blame;
9504 		header = 3;
9505 		scrolld = NULL;
9506 		if (s->selected_line > view->nlines - header) {
9507 			offset = abs(view->nlines - s->selected_line - header);
9508 			s->first_displayed_line += offset;
9509 			s->selected_line -= offset;
9510 			view->offset = offset;
9511 		}
9512 		break;
9513 	}
9514 	case TOG_VIEW_LOG: {
9515 		struct tog_log_view_state *s = &view->state.log;
9516 		scrolld = &log_scroll_down;
9517 		header = view_is_parent_view(view) ? 3 : 2;
9518 		selected = &s->selected;
9519 		break;
9520 	}
9521 	case TOG_VIEW_REF: {
9522 		struct tog_ref_view_state *s = &view->state.ref;
9523 		scrolld = &ref_scroll_down;
9524 		header = 3;
9525 		selected = &s->selected;
9526 		break;
9527 	}
9528 	case TOG_VIEW_TREE: {
9529 		struct tog_tree_view_state *s = &view->state.tree;
9530 		scrolld = &tree_scroll_down;
9531 		header = 5;
9532 		selected = &s->selected;
9533 		break;
9534 	}
9535 	default:
9536 		selected = NULL;
9537 		scrolld = NULL;
9538 		header = 0;
9539 		break;
9540 	}
9541 
9542 	if (selected && *selected > view->nlines - header) {
9543 		offset = abs(view->nlines - *selected - header);
9544 		view->offset = offset;
9545 		if (scrolld && offset) {
9546 			err = scrolld(view, offset);
9547 			*selected -= offset;
9548 		}
9549 	}
9550 
9551 	return err;
9552 }
9553 
9554 static void
9555 list_commands(FILE *fp)
9556 {
9557 	size_t i;
9558 
9559 	fprintf(fp, "commands:");
9560 	for (i = 0; i < nitems(tog_commands); i++) {
9561 		const struct tog_cmd *cmd = &tog_commands[i];
9562 		fprintf(fp, " %s", cmd->name);
9563 	}
9564 	fputc('\n', fp);
9565 }
9566 
9567 __dead static void
9568 usage(int hflag, int status)
9569 {
9570 	FILE *fp = (status == 0) ? stdout : stderr;
9571 
9572 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9573 	    getprogname());
9574 	if (hflag) {
9575 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9576 		list_commands(fp);
9577 	}
9578 	exit(status);
9579 }
9580 
9581 static char **
9582 make_argv(int argc, ...)
9583 {
9584 	va_list ap;
9585 	char **argv;
9586 	int i;
9587 
9588 	va_start(ap, argc);
9589 
9590 	argv = calloc(argc, sizeof(char *));
9591 	if (argv == NULL)
9592 		err(1, "calloc");
9593 	for (i = 0; i < argc; i++) {
9594 		argv[i] = strdup(va_arg(ap, char *));
9595 		if (argv[i] == NULL)
9596 			err(1, "strdup");
9597 	}
9598 
9599 	va_end(ap);
9600 	return argv;
9601 }
9602 
9603 /*
9604  * Try to convert 'tog path' into a 'tog log path' command.
9605  * The user could simply have mistyped the command rather than knowingly
9606  * provided a path. So check whether argv[0] can in fact be resolved
9607  * to a path in the HEAD commit and print a special error if not.
9608  * This hack is for mpi@ <3
9609  */
9610 static const struct got_error *
9611 tog_log_with_path(int argc, char *argv[])
9612 {
9613 	const struct got_error *error = NULL, *close_err;
9614 	const struct tog_cmd *cmd = NULL;
9615 	struct got_repository *repo = NULL;
9616 	struct got_worktree *worktree = NULL;
9617 	struct got_object_id *commit_id = NULL, *id = NULL;
9618 	struct got_commit_object *commit = NULL;
9619 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9620 	char *commit_id_str = NULL, **cmd_argv = NULL;
9621 	int *pack_fds = NULL;
9622 
9623 	cwd = getcwd(NULL, 0);
9624 	if (cwd == NULL)
9625 		return got_error_from_errno("getcwd");
9626 
9627 	error = got_repo_pack_fds_open(&pack_fds);
9628 	if (error != NULL)
9629 		goto done;
9630 
9631 	error = got_worktree_open(&worktree, cwd);
9632 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9633 		goto done;
9634 
9635 	if (worktree)
9636 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9637 	else
9638 		repo_path = strdup(cwd);
9639 	if (repo_path == NULL) {
9640 		error = got_error_from_errno("strdup");
9641 		goto done;
9642 	}
9643 
9644 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9645 	if (error != NULL)
9646 		goto done;
9647 
9648 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9649 	    repo, worktree);
9650 	if (error)
9651 		goto done;
9652 
9653 	error = tog_load_refs(repo, 0);
9654 	if (error)
9655 		goto done;
9656 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9657 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9658 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9659 	if (error)
9660 		goto done;
9661 
9662 	if (worktree) {
9663 		got_worktree_close(worktree);
9664 		worktree = NULL;
9665 	}
9666 
9667 	error = got_object_open_as_commit(&commit, repo, commit_id);
9668 	if (error)
9669 		goto done;
9670 
9671 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9672 	if (error) {
9673 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9674 			goto done;
9675 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9676 		    getprogname(), argv[0]);
9677 		usage(1, 1);
9678 		/* not reached */
9679 	}
9680 
9681 	error = got_object_id_str(&commit_id_str, commit_id);
9682 	if (error)
9683 		goto done;
9684 
9685 	cmd = &tog_commands[0]; /* log */
9686 	argc = 4;
9687 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9688 	error = cmd->cmd_main(argc, cmd_argv);
9689 done:
9690 	if (repo) {
9691 		close_err = got_repo_close(repo);
9692 		if (error == NULL)
9693 			error = close_err;
9694 	}
9695 	if (commit)
9696 		got_object_commit_close(commit);
9697 	if (worktree)
9698 		got_worktree_close(worktree);
9699 	if (pack_fds) {
9700 		const struct got_error *pack_err =
9701 		    got_repo_pack_fds_close(pack_fds);
9702 		if (error == NULL)
9703 			error = pack_err;
9704 	}
9705 	free(id);
9706 	free(commit_id_str);
9707 	free(commit_id);
9708 	free(cwd);
9709 	free(repo_path);
9710 	free(in_repo_path);
9711 	if (cmd_argv) {
9712 		int i;
9713 		for (i = 0; i < argc; i++)
9714 			free(cmd_argv[i]);
9715 		free(cmd_argv);
9716 	}
9717 	tog_free_refs();
9718 	return error;
9719 }
9720 
9721 int
9722 main(int argc, char *argv[])
9723 {
9724 	const struct got_error *io_err, *error = NULL;
9725 	const struct tog_cmd *cmd = NULL;
9726 	int ch, hflag = 0, Vflag = 0;
9727 	char **cmd_argv = NULL;
9728 	static const struct option longopts[] = {
9729 	    { "version", no_argument, NULL, 'V' },
9730 	    { NULL, 0, NULL, 0}
9731 	};
9732 	char *diff_algo_str = NULL;
9733 	const char *test_script_path;
9734 
9735 	setlocale(LC_CTYPE, "");
9736 
9737 	/*
9738 	 * Test mode init must happen before pledge() because "tty" will
9739 	 * not allow TTY-related ioctls to occur via regular files.
9740 	 */
9741 	test_script_path = getenv("GOT_TOG_TEST");
9742 	if (test_script_path != NULL) {
9743 		error = init_mock_term(test_script_path);
9744 		if (error) {
9745 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9746 			return 1;
9747 		}
9748 	}
9749 
9750 #if !defined(PROFILE)
9751 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9752 	    NULL) == -1)
9753 		err(1, "pledge");
9754 #endif
9755 
9756 	if (!isatty(STDIN_FILENO))
9757 		errx(1, "standard input is not a tty");
9758 
9759 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9760 		switch (ch) {
9761 		case 'h':
9762 			hflag = 1;
9763 			break;
9764 		case 'V':
9765 			Vflag = 1;
9766 			break;
9767 		default:
9768 			usage(hflag, 1);
9769 			/* NOTREACHED */
9770 		}
9771 	}
9772 
9773 	argc -= optind;
9774 	argv += optind;
9775 	optind = 1;
9776 	optreset = 1;
9777 
9778 	if (Vflag) {
9779 		got_version_print_str();
9780 		return 0;
9781 	}
9782 
9783 	if (argc == 0) {
9784 		if (hflag)
9785 			usage(hflag, 0);
9786 		/* Build an argument vector which runs a default command. */
9787 		cmd = &tog_commands[0];
9788 		argc = 1;
9789 		cmd_argv = make_argv(argc, cmd->name);
9790 	} else {
9791 		size_t i;
9792 
9793 		/* Did the user specify a command? */
9794 		for (i = 0; i < nitems(tog_commands); i++) {
9795 			if (strncmp(tog_commands[i].name, argv[0],
9796 			    strlen(argv[0])) == 0) {
9797 				cmd = &tog_commands[i];
9798 				break;
9799 			}
9800 		}
9801 	}
9802 
9803 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9804 	if (diff_algo_str) {
9805 		if (strcasecmp(diff_algo_str, "patience") == 0)
9806 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9807 		if (strcasecmp(diff_algo_str, "myers") == 0)
9808 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9809 	}
9810 
9811 	if (cmd == NULL) {
9812 		if (argc != 1)
9813 			usage(0, 1);
9814 		/* No command specified; try log with a path */
9815 		error = tog_log_with_path(argc, argv);
9816 	} else {
9817 		if (hflag)
9818 			cmd->cmd_usage();
9819 		else
9820 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9821 	}
9822 
9823 	if (using_mock_io) {
9824 		io_err = tog_io_close();
9825 		if (error == NULL)
9826 			error = io_err;
9827 	}
9828 	endwin();
9829 	if (cmd_argv) {
9830 		int i;
9831 		for (i = 0; i < argc; i++)
9832 			free(cmd_argv[i]);
9833 		free(cmd_argv);
9834 	}
9835 
9836 	if (error && error->code != GOT_ERR_CANCELLED &&
9837 	    error->code != GOT_ERR_EOF &&
9838 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9839 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9840 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9841 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9842 	return 0;
9843 }