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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 #include "got_keyword.h"
62 
63 #ifndef MIN
64 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
65 #endif
66 
67 #ifndef MAX
68 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
69 #endif
70 
71 #ifndef CTRL
72 #define CTRL(x)		((x) & 0x1f)
73 #endif
74 
75 #ifndef nitems
76 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
77 #endif
78 
79 struct tog_cmd {
80 	const char *name;
81 	const struct got_error *(*cmd_main)(int, char *[]);
82 	void (*cmd_usage)(void);
83 };
84 
85 __dead static void	usage(int, int);
86 __dead static void	usage_log(void);
87 __dead static void	usage_diff(void);
88 __dead static void	usage_blame(void);
89 __dead static void	usage_tree(void);
90 __dead static void	usage_ref(void);
91 
92 static const struct got_error*	cmd_log(int, char *[]);
93 static const struct got_error*	cmd_diff(int, char *[]);
94 static const struct got_error*	cmd_blame(int, char *[]);
95 static const struct got_error*	cmd_tree(int, char *[]);
96 static const struct got_error*	cmd_ref(int, char *[]);
97 
98 static const struct tog_cmd tog_commands[] = {
99 	{ "log",	cmd_log,	usage_log },
100 	{ "diff",	cmd_diff,	usage_diff },
101 	{ "blame",	cmd_blame,	usage_blame },
102 	{ "tree",	cmd_tree,	usage_tree },
103 	{ "ref",	cmd_ref,	usage_ref },
104 };
105 
106 enum tog_view_type {
107 	TOG_VIEW_DIFF,
108 	TOG_VIEW_LOG,
109 	TOG_VIEW_BLAME,
110 	TOG_VIEW_TREE,
111 	TOG_VIEW_REF,
112 	TOG_VIEW_HELP
113 };
114 
115 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
116 enum tog_keymap_type {
117 	TOG_KEYMAP_KEYS = -2,
118 	TOG_KEYMAP_GLOBAL,
119 	TOG_KEYMAP_DIFF,
120 	TOG_KEYMAP_LOG,
121 	TOG_KEYMAP_BLAME,
122 	TOG_KEYMAP_TREE,
123 	TOG_KEYMAP_REF,
124 	TOG_KEYMAP_HELP
125 };
126 
127 enum tog_view_mode {
128 	TOG_VIEW_SPLIT_NONE,
129 	TOG_VIEW_SPLIT_VERT,
130 	TOG_VIEW_SPLIT_HRZN
131 };
132 
133 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
134 
135 #define TOG_EOF_STRING	"(END)"
136 
137 struct commit_queue_entry {
138 	TAILQ_ENTRY(commit_queue_entry) entry;
139 	struct got_object_id *id;
140 	struct got_commit_object *commit;
141 	int idx;
142 };
143 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
144 struct commit_queue {
145 	int ncommits;
146 	struct commit_queue_head head;
147 };
148 
149 struct tog_color {
150 	STAILQ_ENTRY(tog_color) entry;
151 	regex_t regex;
152 	short colorpair;
153 };
154 STAILQ_HEAD(tog_colors, tog_color);
155 
156 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
157 static struct got_reflist_object_id_map *tog_refs_idmap;
158 static struct {
159 	struct got_object_id	*id;
160 	int			 idx;
161 	char			 marker;
162 } tog_base_commit;
163 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
164 
165 static const struct got_error *
166 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
167     struct got_reference* re2)
168 {
169 	const char *name1 = got_ref_get_name(re1);
170 	const char *name2 = got_ref_get_name(re2);
171 	int isbackup1, isbackup2;
172 
173 	/* Sort backup refs towards the bottom of the list. */
174 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
175 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
176 	if (!isbackup1 && isbackup2) {
177 		*cmp = -1;
178 		return NULL;
179 	} else if (isbackup1 && !isbackup2) {
180 		*cmp = 1;
181 		return NULL;
182 	}
183 
184 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
185 	return NULL;
186 }
187 
188 static const struct got_error *
189 tog_load_refs(struct got_repository *repo, int sort_by_date)
190 {
191 	const struct got_error *err;
192 
193 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
194 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
195 	    repo);
196 	if (err)
197 		return err;
198 
199 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
200 	    repo);
201 }
202 
203 static void
204 tog_free_refs(void)
205 {
206 	if (tog_refs_idmap) {
207 		got_reflist_object_id_map_free(tog_refs_idmap);
208 		tog_refs_idmap = NULL;
209 	}
210 	got_ref_list_free(&tog_refs);
211 }
212 
213 static const struct got_error *
214 add_color(struct tog_colors *colors, const char *pattern,
215     int idx, short color)
216 {
217 	const struct got_error *err = NULL;
218 	struct tog_color *tc;
219 	int regerr = 0;
220 
221 	if (idx < 1 || idx > COLOR_PAIRS - 1)
222 		return NULL;
223 
224 	init_pair(idx, color, -1);
225 
226 	tc = calloc(1, sizeof(*tc));
227 	if (tc == NULL)
228 		return got_error_from_errno("calloc");
229 	regerr = regcomp(&tc->regex, pattern,
230 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
231 	if (regerr) {
232 		static char regerr_msg[512];
233 		static char err_msg[512];
234 		regerror(regerr, &tc->regex, regerr_msg,
235 		    sizeof(regerr_msg));
236 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
237 		    regerr_msg);
238 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
239 		free(tc);
240 		return err;
241 	}
242 	tc->colorpair = idx;
243 	STAILQ_INSERT_HEAD(colors, tc, entry);
244 	return NULL;
245 }
246 
247 static void
248 free_colors(struct tog_colors *colors)
249 {
250 	struct tog_color *tc;
251 
252 	while (!STAILQ_EMPTY(colors)) {
253 		tc = STAILQ_FIRST(colors);
254 		STAILQ_REMOVE_HEAD(colors, entry);
255 		regfree(&tc->regex);
256 		free(tc);
257 	}
258 }
259 
260 static struct tog_color *
261 get_color(struct tog_colors *colors, int colorpair)
262 {
263 	struct tog_color *tc = NULL;
264 
265 	STAILQ_FOREACH(tc, colors, entry) {
266 		if (tc->colorpair == colorpair)
267 			return tc;
268 	}
269 
270 	return NULL;
271 }
272 
273 static int
274 default_color_value(const char *envvar)
275 {
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
281 		return COLOR_YELLOW;
282 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
285 		return COLOR_MAGENTA;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
287 		return COLOR_MAGENTA;
288 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
291 		return COLOR_GREEN;
292 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
295 		return COLOR_CYAN;
296 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
299 		return COLOR_GREEN;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
301 		return COLOR_MAGENTA;
302 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
303 		return COLOR_YELLOW;
304 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
305 		return COLOR_CYAN;
306 
307 	return -1;
308 }
309 
310 static int
311 get_color_value(const char *envvar)
312 {
313 	const char *val = getenv(envvar);
314 
315 	if (val == NULL)
316 		return default_color_value(envvar);
317 
318 	if (strcasecmp(val, "black") == 0)
319 		return COLOR_BLACK;
320 	if (strcasecmp(val, "red") == 0)
321 		return COLOR_RED;
322 	if (strcasecmp(val, "green") == 0)
323 		return COLOR_GREEN;
324 	if (strcasecmp(val, "yellow") == 0)
325 		return COLOR_YELLOW;
326 	if (strcasecmp(val, "blue") == 0)
327 		return COLOR_BLUE;
328 	if (strcasecmp(val, "magenta") == 0)
329 		return COLOR_MAGENTA;
330 	if (strcasecmp(val, "cyan") == 0)
331 		return COLOR_CYAN;
332 	if (strcasecmp(val, "white") == 0)
333 		return COLOR_WHITE;
334 	if (strcasecmp(val, "default") == 0)
335 		return -1;
336 
337 	return default_color_value(envvar);
338 }
339 
340 struct tog_diff_view_state {
341 	struct got_object_id *id1, *id2;
342 	const char *label1, *label2;
343 	FILE *f, *f1, *f2;
344 	int fd1, fd2;
345 	int lineno;
346 	int first_displayed_line;
347 	int last_displayed_line;
348 	int eof;
349 	int diff_context;
350 	int ignore_whitespace;
351 	int force_text_diff;
352 	struct got_repository *repo;
353 	struct got_diff_line *lines;
354 	size_t nlines;
355 	int matched_line;
356 	int selected_line;
357 
358 	/* passed from log or blame view; may be NULL */
359 	struct tog_view *parent_view;
360 };
361 
362 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
363 static volatile sig_atomic_t tog_thread_error;
364 
365 struct tog_log_thread_args {
366 	pthread_cond_t need_commits;
367 	pthread_cond_t commit_loaded;
368 	int commits_needed;
369 	int load_all;
370 	struct got_commit_graph *graph;
371 	struct commit_queue *real_commits;
372 	const char *in_repo_path;
373 	struct got_object_id *start_id;
374 	struct got_repository *repo;
375 	int *pack_fds;
376 	int log_complete;
377 	pthread_cond_t log_loaded;
378 	sig_atomic_t *quit;
379 	struct commit_queue_entry **first_displayed_entry;
380 	struct commit_queue_entry **selected_entry;
381 	int *searching;
382 	int *search_next_done;
383 	regex_t *regex;
384 	int *limiting;
385 	int limit_match;
386 	regex_t *limit_regex;
387 	struct commit_queue *limit_commits;
388 	struct got_worktree *worktree;
389 	int need_commit_marker;
390 };
391 
392 struct tog_log_view_state {
393 	struct commit_queue *commits;
394 	struct commit_queue_entry *first_displayed_entry;
395 	struct commit_queue_entry *last_displayed_entry;
396 	struct commit_queue_entry *selected_entry;
397 	struct commit_queue real_commits;
398 	int selected;
399 	char *in_repo_path;
400 	char *head_ref_name;
401 	int log_branches;
402 	struct got_repository *repo;
403 	struct got_object_id *start_id;
404 	sig_atomic_t quit;
405 	pthread_t thread;
406 	struct tog_log_thread_args thread_args;
407 	struct commit_queue_entry *matched_entry;
408 	struct commit_queue_entry *search_entry;
409 	struct tog_colors colors;
410 	int use_committer;
411 	int limit_view;
412 	regex_t limit_regex;
413 	struct commit_queue limit_commits;
414 };
415 
416 #define TOG_COLOR_DIFF_MINUS		1
417 #define TOG_COLOR_DIFF_PLUS		2
418 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
419 #define TOG_COLOR_DIFF_META		4
420 #define TOG_COLOR_TREE_SUBMODULE	5
421 #define TOG_COLOR_TREE_SYMLINK		6
422 #define TOG_COLOR_TREE_DIRECTORY	7
423 #define TOG_COLOR_TREE_EXECUTABLE	8
424 #define TOG_COLOR_COMMIT		9
425 #define TOG_COLOR_AUTHOR		10
426 #define TOG_COLOR_DATE			11
427 #define TOG_COLOR_REFS_HEADS		12
428 #define TOG_COLOR_REFS_TAGS		13
429 #define TOG_COLOR_REFS_REMOTES		14
430 #define TOG_COLOR_REFS_BACKUP		15
431 
432 struct tog_blame_cb_args {
433 	struct tog_blame_line *lines; /* one per line */
434 	int nlines;
435 
436 	struct tog_view *view;
437 	struct got_object_id *commit_id;
438 	int *quit;
439 };
440 
441 struct tog_blame_thread_args {
442 	const char *path;
443 	struct got_repository *repo;
444 	struct tog_blame_cb_args *cb_args;
445 	int *complete;
446 	got_cancel_cb cancel_cb;
447 	void *cancel_arg;
448 	pthread_cond_t blame_complete;
449 };
450 
451 struct tog_blame {
452 	FILE *f;
453 	off_t filesize;
454 	struct tog_blame_line *lines;
455 	int nlines;
456 	off_t *line_offsets;
457 	pthread_t thread;
458 	struct tog_blame_thread_args thread_args;
459 	struct tog_blame_cb_args cb_args;
460 	const char *path;
461 	int *pack_fds;
462 };
463 
464 struct tog_blame_view_state {
465 	int first_displayed_line;
466 	int last_displayed_line;
467 	int selected_line;
468 	int last_diffed_line;
469 	int blame_complete;
470 	int eof;
471 	int done;
472 	struct got_object_id_queue blamed_commits;
473 	struct got_object_qid *blamed_commit;
474 	char *path;
475 	struct got_repository *repo;
476 	struct got_object_id *commit_id;
477 	struct got_object_id *id_to_log;
478 	struct tog_blame blame;
479 	int matched_line;
480 	struct tog_colors colors;
481 };
482 
483 struct tog_parent_tree {
484 	TAILQ_ENTRY(tog_parent_tree) entry;
485 	struct got_tree_object *tree;
486 	struct got_tree_entry *first_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int selected;
489 };
490 
491 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
492 
493 struct tog_tree_view_state {
494 	char *tree_label;
495 	struct got_object_id *commit_id;/* commit which this tree belongs to */
496 	struct got_tree_object *root;	/* the commit's root tree entry */
497 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
498 	struct got_tree_entry *first_displayed_entry;
499 	struct got_tree_entry *last_displayed_entry;
500 	struct got_tree_entry *selected_entry;
501 	int ndisplayed, selected, show_ids;
502 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
503 	char *head_ref_name;
504 	struct got_repository *repo;
505 	struct got_tree_entry *matched_entry;
506 	struct tog_colors colors;
507 };
508 
509 struct tog_reflist_entry {
510 	TAILQ_ENTRY(tog_reflist_entry) entry;
511 	struct got_reference *ref;
512 	int idx;
513 };
514 
515 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
516 
517 struct tog_ref_view_state {
518 	struct tog_reflist_head refs;
519 	struct tog_reflist_entry *first_displayed_entry;
520 	struct tog_reflist_entry *last_displayed_entry;
521 	struct tog_reflist_entry *selected_entry;
522 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
523 	struct got_repository *repo;
524 	struct tog_reflist_entry *matched_entry;
525 	struct tog_colors colors;
526 };
527 
528 struct tog_help_view_state {
529 	FILE			*f;
530 	off_t			*line_offsets;
531 	size_t			 nlines;
532 	int			 lineno;
533 	int			 first_displayed_line;
534 	int			 last_displayed_line;
535 	int			 eof;
536 	int			 matched_line;
537 	int			 selected_line;
538 	int			 all;
539 	enum tog_keymap_type	 type;
540 };
541 
542 #define GENERATE_HELP \
543 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
544 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
545 	KEY_("k C-p Up", "Move cursor or page up one line"), \
546 	KEY_("j C-n Down", "Move cursor or page down one line"), \
547 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
548 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
549 	KEY_("C-u u", "Scroll the view up one half page"), \
550 	KEY_("C-d d", "Scroll the view down one half page"), \
551 	KEY_("g", "Go to line N (default: first line)"), \
552 	KEY_("Home =", "Go to the first line"), \
553 	KEY_("G", "Go to line N (default: last line)"), \
554 	KEY_("End *", "Go to the last line"), \
555 	KEY_("l Right", "Scroll the view right"), \
556 	KEY_("h Left", "Scroll the view left"), \
557 	KEY_("$", "Scroll view to the rightmost position"), \
558 	KEY_("0", "Scroll view to the leftmost position"), \
559 	KEY_("-", "Decrease size of the focussed split"), \
560 	KEY_("+", "Increase size of the focussed split"), \
561 	KEY_("Tab", "Switch focus between views"), \
562 	KEY_("F", "Toggle fullscreen mode"), \
563 	KEY_("S", "Switch split-screen layout"), \
564 	KEY_("/", "Open prompt to enter search term"), \
565 	KEY_("n", "Find next line/token matching the current search term"), \
566 	KEY_("N", "Find previous line/token matching the current search term"),\
567 	KEY_("q", "Quit the focussed view; Quit help screen"), \
568 	KEY_("Q", "Quit tog"), \
569 	\
570 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
571 	KEY_("< ,", "Move cursor up one commit"), \
572 	KEY_("> .", "Move cursor down one commit"), \
573 	KEY_("Enter", "Open diff view of the selected commit"), \
574 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
575 	KEY_("R", "Open ref view of all repository references"), \
576 	KEY_("T", "Display tree view of the repository from the selected" \
577 	    " commit"), \
578 	KEY_("@", "Toggle between displaying author and committer name"), \
579 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
580 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
581 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
582 	\
583 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
584 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
585 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
586 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
587 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
588 	    " data"), \
589 	KEY_("(", "Go to the previous file in the diff"), \
590 	KEY_(")", "Go to the next file in the diff"), \
591 	KEY_("{", "Go to the previous hunk in the diff"), \
592 	KEY_("}", "Go to the next hunk in the diff"), \
593 	KEY_("[", "Decrease the number of context lines"), \
594 	KEY_("]", "Increase the number of context lines"), \
595 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
596 	\
597 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
598 	KEY_("Enter", "Display diff view of the selected line's commit"), \
599 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
600 	KEY_("L", "Open log view for the currently selected annotated line"), \
601 	KEY_("C", "Reload view with the previously blamed commit"), \
602 	KEY_("c", "Reload view with the version of the file found in the" \
603 	    " selected line's commit"), \
604 	KEY_("p", "Reload view with the version of the file found in the" \
605 	    " selected line's parent commit"), \
606 	\
607 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
608 	KEY_("Enter", "Enter selected directory or open blame view of the" \
609 	    " selected file"), \
610 	KEY_("L", "Open log view for the selected entry"), \
611 	KEY_("R", "Open ref view of all repository references"), \
612 	KEY_("i", "Show object IDs for all tree entries"), \
613 	KEY_("Backspace", "Return to the parent directory"), \
614 	\
615 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
616 	KEY_("Enter", "Display log view of the selected reference"), \
617 	KEY_("T", "Display tree view of the selected reference"), \
618 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
619 	KEY_("m", "Toggle display of last modified date for each reference"), \
620 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
621 	KEY_("C-l", "Reload view with all repository references")
622 
623 struct tog_key_map {
624 	const char		*keys;
625 	const char		*info;
626 	enum tog_keymap_type	 type;
627 };
628 
629 /* curses io for tog regress */
630 struct tog_io {
631 	FILE	*cin;
632 	FILE	*cout;
633 	FILE	*f;
634 	FILE	*sdump;
635 	int	 wait_for_ui;
636 } tog_io;
637 static int using_mock_io;
638 
639 #define TOG_KEY_SCRDUMP	SHRT_MIN
640 
641 /*
642  * We implement two types of views: parent views and child views.
643  *
644  * The 'Tab' key switches focus between a parent view and its child view.
645  * Child views are shown side-by-side to their parent view, provided
646  * there is enough screen estate.
647  *
648  * When a new view is opened from within a parent view, this new view
649  * becomes a child view of the parent view, replacing any existing child.
650  *
651  * When a new view is opened from within a child view, this new view
652  * becomes a parent view which will obscure the views below until the
653  * user quits the new parent view by typing 'q'.
654  *
655  * This list of views contains parent views only.
656  * Child views are only pointed to by their parent view.
657  */
658 TAILQ_HEAD(tog_view_list_head, tog_view);
659 
660 struct tog_view {
661 	TAILQ_ENTRY(tog_view) entry;
662 	WINDOW *window;
663 	PANEL *panel;
664 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
665 	int resized_y, resized_x; /* begin_y/x based on user resizing */
666 	int maxx, x; /* max column and current start column */
667 	int lines, cols; /* copies of LINES and COLS */
668 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
669 	int gline, hiline; /* navigate to and highlight this nG line */
670 	int ch, count; /* current keymap and count prefix */
671 	int resized; /* set when in a resize event */
672 	int focussed; /* Only set on one parent or child view at a time. */
673 	int dying;
674 	struct tog_view *parent;
675 	struct tog_view *child;
676 
677 	/*
678 	 * This flag is initially set on parent views when a new child view
679 	 * is created. It gets toggled when the 'Tab' key switches focus
680 	 * between parent and child.
681 	 * The flag indicates whether focus should be passed on to our child
682 	 * view if this parent view gets picked for focus after another parent
683 	 * view was closed. This prevents child views from losing focus in such
684 	 * situations.
685 	 */
686 	int focus_child;
687 
688 	enum tog_view_mode mode;
689 	/* type-specific state */
690 	enum tog_view_type type;
691 	union {
692 		struct tog_diff_view_state diff;
693 		struct tog_log_view_state log;
694 		struct tog_blame_view_state blame;
695 		struct tog_tree_view_state tree;
696 		struct tog_ref_view_state ref;
697 		struct tog_help_view_state help;
698 	} state;
699 
700 	const struct got_error *(*show)(struct tog_view *);
701 	const struct got_error *(*input)(struct tog_view **,
702 	    struct tog_view *, int);
703 	const struct got_error *(*reset)(struct tog_view *);
704 	const struct got_error *(*resize)(struct tog_view *, int);
705 	const struct got_error *(*close)(struct tog_view *);
706 
707 	const struct got_error *(*search_start)(struct tog_view *);
708 	const struct got_error *(*search_next)(struct tog_view *);
709 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
710 	    int **, int **, int **, int **);
711 	int search_started;
712 	int searching;
713 #define TOG_SEARCH_FORWARD	1
714 #define TOG_SEARCH_BACKWARD	2
715 	int search_next_done;
716 #define TOG_SEARCH_HAVE_MORE	1
717 #define TOG_SEARCH_NO_MORE	2
718 #define TOG_SEARCH_HAVE_NONE	3
719 	regex_t regex;
720 	regmatch_t regmatch;
721 	const char *action;
722 };
723 
724 static const struct got_error *open_diff_view(struct tog_view *,
725     struct got_object_id *, struct got_object_id *,
726     const char *, const char *, int, int, int, struct tog_view *,
727     struct got_repository *);
728 static const struct got_error *show_diff_view(struct tog_view *);
729 static const struct got_error *input_diff_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *reset_diff_view(struct tog_view *);
732 static const struct got_error* close_diff_view(struct tog_view *);
733 static const struct got_error *search_start_diff_view(struct tog_view *);
734 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
735     size_t *, int **, int **, int **, int **);
736 static const struct got_error *search_next_view_match(struct tog_view *);
737 
738 static const struct got_error *open_log_view(struct tog_view *,
739     struct got_object_id *, struct got_repository *,
740     const char *, const char *, int, struct got_worktree *);
741 static const struct got_error * show_log_view(struct tog_view *);
742 static const struct got_error *input_log_view(struct tog_view **,
743     struct tog_view *, int);
744 static const struct got_error *resize_log_view(struct tog_view *, int);
745 static const struct got_error *close_log_view(struct tog_view *);
746 static const struct got_error *search_start_log_view(struct tog_view *);
747 static const struct got_error *search_next_log_view(struct tog_view *);
748 
749 static const struct got_error *open_blame_view(struct tog_view *, char *,
750     struct got_object_id *, struct got_repository *);
751 static const struct got_error *show_blame_view(struct tog_view *);
752 static const struct got_error *input_blame_view(struct tog_view **,
753     struct tog_view *, int);
754 static const struct got_error *reset_blame_view(struct tog_view *);
755 static const struct got_error *close_blame_view(struct tog_view *);
756 static const struct got_error *search_start_blame_view(struct tog_view *);
757 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
758     size_t *, int **, int **, int **, int **);
759 
760 static const struct got_error *open_tree_view(struct tog_view *,
761     struct got_object_id *, const char *, struct got_repository *);
762 static const struct got_error *show_tree_view(struct tog_view *);
763 static const struct got_error *input_tree_view(struct tog_view **,
764     struct tog_view *, int);
765 static const struct got_error *close_tree_view(struct tog_view *);
766 static const struct got_error *search_start_tree_view(struct tog_view *);
767 static const struct got_error *search_next_tree_view(struct tog_view *);
768 
769 static const struct got_error *open_ref_view(struct tog_view *,
770     struct got_repository *);
771 static const struct got_error *show_ref_view(struct tog_view *);
772 static const struct got_error *input_ref_view(struct tog_view **,
773     struct tog_view *, int);
774 static const struct got_error *close_ref_view(struct tog_view *);
775 static const struct got_error *search_start_ref_view(struct tog_view *);
776 static const struct got_error *search_next_ref_view(struct tog_view *);
777 
778 static const struct got_error *open_help_view(struct tog_view *,
779     struct tog_view *);
780 static const struct got_error *show_help_view(struct tog_view *);
781 static const struct got_error *input_help_view(struct tog_view **,
782     struct tog_view *, int);
783 static const struct got_error *reset_help_view(struct tog_view *);
784 static const struct got_error* close_help_view(struct tog_view *);
785 static const struct got_error *search_start_help_view(struct tog_view *);
786 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
787     size_t *, int **, int **, int **, int **);
788 
789 static volatile sig_atomic_t tog_sigwinch_received;
790 static volatile sig_atomic_t tog_sigpipe_received;
791 static volatile sig_atomic_t tog_sigcont_received;
792 static volatile sig_atomic_t tog_sigint_received;
793 static volatile sig_atomic_t tog_sigterm_received;
794 
795 static void
796 tog_sigwinch(int signo)
797 {
798 	tog_sigwinch_received = 1;
799 }
800 
801 static void
802 tog_sigpipe(int signo)
803 {
804 	tog_sigpipe_received = 1;
805 }
806 
807 static void
808 tog_sigcont(int signo)
809 {
810 	tog_sigcont_received = 1;
811 }
812 
813 static void
814 tog_sigint(int signo)
815 {
816 	tog_sigint_received = 1;
817 }
818 
819 static void
820 tog_sigterm(int signo)
821 {
822 	tog_sigterm_received = 1;
823 }
824 
825 static int
826 tog_fatal_signal_received(void)
827 {
828 	return (tog_sigpipe_received ||
829 	    tog_sigint_received || tog_sigterm_received);
830 }
831 
832 static const struct got_error *
833 view_close(struct tog_view *view)
834 {
835 	const struct got_error *err = NULL, *child_err = NULL;
836 
837 	if (view->child) {
838 		child_err = view_close(view->child);
839 		view->child = NULL;
840 	}
841 	if (view->close)
842 		err = view->close(view);
843 	if (view->panel)
844 		del_panel(view->panel);
845 	if (view->window)
846 		delwin(view->window);
847 	free(view);
848 	return err ? err : child_err;
849 }
850 
851 static struct tog_view *
852 view_open(int nlines, int ncols, int begin_y, int begin_x,
853     enum tog_view_type type)
854 {
855 	struct tog_view *view = calloc(1, sizeof(*view));
856 
857 	if (view == NULL)
858 		return NULL;
859 
860 	view->type = type;
861 	view->lines = LINES;
862 	view->cols = COLS;
863 	view->nlines = nlines ? nlines : LINES - begin_y;
864 	view->ncols = ncols ? ncols : COLS - begin_x;
865 	view->begin_y = begin_y;
866 	view->begin_x = begin_x;
867 	view->window = newwin(nlines, ncols, begin_y, begin_x);
868 	if (view->window == NULL) {
869 		view_close(view);
870 		return NULL;
871 	}
872 	view->panel = new_panel(view->window);
873 	if (view->panel == NULL ||
874 	    set_panel_userptr(view->panel, view) != OK) {
875 		view_close(view);
876 		return NULL;
877 	}
878 
879 	keypad(view->window, TRUE);
880 	return view;
881 }
882 
883 static int
884 view_split_begin_x(int begin_x)
885 {
886 	if (begin_x > 0 || COLS < 120)
887 		return 0;
888 	return (COLS - MAX(COLS / 2, 80));
889 }
890 
891 /* XXX Stub till we decide what to do. */
892 static int
893 view_split_begin_y(int lines)
894 {
895 	return lines * HSPLIT_SCALE;
896 }
897 
898 static const struct got_error *view_resize(struct tog_view *);
899 
900 static const struct got_error *
901 view_splitscreen(struct tog_view *view)
902 {
903 	const struct got_error *err = NULL;
904 
905 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
906 		if (view->resized_y && view->resized_y < view->lines)
907 			view->begin_y = view->resized_y;
908 		else
909 			view->begin_y = view_split_begin_y(view->nlines);
910 		view->begin_x = 0;
911 	} else if (!view->resized) {
912 		if (view->resized_x && view->resized_x < view->cols - 1 &&
913 		    view->cols > 119)
914 			view->begin_x = view->resized_x;
915 		else
916 			view->begin_x = view_split_begin_x(0);
917 		view->begin_y = 0;
918 	}
919 	view->nlines = LINES - view->begin_y;
920 	view->ncols = COLS - view->begin_x;
921 	view->lines = LINES;
922 	view->cols = COLS;
923 	err = view_resize(view);
924 	if (err)
925 		return err;
926 
927 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
928 		view->parent->nlines = view->begin_y;
929 
930 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
931 		return got_error_from_errno("mvwin");
932 
933 	return NULL;
934 }
935 
936 static const struct got_error *
937 view_fullscreen(struct tog_view *view)
938 {
939 	const struct got_error *err = NULL;
940 
941 	view->begin_x = 0;
942 	view->begin_y = view->resized ? view->begin_y : 0;
943 	view->nlines = view->resized ? view->nlines : LINES;
944 	view->ncols = COLS;
945 	view->lines = LINES;
946 	view->cols = COLS;
947 	err = view_resize(view);
948 	if (err)
949 		return err;
950 
951 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
952 		return got_error_from_errno("mvwin");
953 
954 	return NULL;
955 }
956 
957 static int
958 view_is_parent_view(struct tog_view *view)
959 {
960 	return view->parent == NULL;
961 }
962 
963 static int
964 view_is_splitscreen(struct tog_view *view)
965 {
966 	return view->begin_x > 0 || view->begin_y > 0;
967 }
968 
969 static int
970 view_is_fullscreen(struct tog_view *view)
971 {
972 	return view->nlines == LINES && view->ncols == COLS;
973 }
974 
975 static int
976 view_is_hsplit_top(struct tog_view *view)
977 {
978 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
979 	    view_is_splitscreen(view->child);
980 }
981 
982 static void
983 view_border(struct tog_view *view)
984 {
985 	PANEL *panel;
986 	const struct tog_view *view_above;
987 
988 	if (view->parent)
989 		return view_border(view->parent);
990 
991 	panel = panel_above(view->panel);
992 	if (panel == NULL)
993 		return;
994 
995 	view_above = panel_userptr(panel);
996 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
997 		mvwhline(view->window, view_above->begin_y - 1,
998 		    view->begin_x, ACS_HLINE, view->ncols);
999 	else
1000 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1001 		    ACS_VLINE, view->nlines);
1002 }
1003 
1004 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1005 static const struct got_error *request_log_commits(struct tog_view *);
1006 static const struct got_error *offset_selection_down(struct tog_view *);
1007 static void offset_selection_up(struct tog_view *);
1008 static void view_get_split(struct tog_view *, int *, int *);
1009 
1010 static const struct got_error *
1011 view_resize(struct tog_view *view)
1012 {
1013 	const struct got_error	*err = NULL;
1014 	int			 dif, nlines, ncols;
1015 
1016 	dif = LINES - view->lines;  /* line difference */
1017 
1018 	if (view->lines > LINES)
1019 		nlines = view->nlines - (view->lines - LINES);
1020 	else
1021 		nlines = view->nlines + (LINES - view->lines);
1022 	if (view->cols > COLS)
1023 		ncols = view->ncols - (view->cols - COLS);
1024 	else
1025 		ncols = view->ncols + (COLS - view->cols);
1026 
1027 	if (view->child) {
1028 		int hs = view->child->begin_y;
1029 
1030 		if (!view_is_fullscreen(view))
1031 			view->child->begin_x = view_split_begin_x(view->begin_x);
1032 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1033 		    view->child->begin_x == 0) {
1034 			ncols = COLS;
1035 
1036 			view_fullscreen(view->child);
1037 			if (view->child->focussed)
1038 				show_panel(view->child->panel);
1039 			else
1040 				show_panel(view->panel);
1041 		} else {
1042 			ncols = view->child->begin_x;
1043 
1044 			view_splitscreen(view->child);
1045 			show_panel(view->child->panel);
1046 		}
1047 		/*
1048 		 * XXX This is ugly and needs to be moved into the above
1049 		 * logic but "works" for now and my attempts at moving it
1050 		 * break either 'tab' or 'F' key maps in horizontal splits.
1051 		 */
1052 		if (hs) {
1053 			err = view_splitscreen(view->child);
1054 			if (err)
1055 				return err;
1056 			if (dif < 0) { /* top split decreased */
1057 				err = offset_selection_down(view);
1058 				if (err)
1059 					return err;
1060 			}
1061 			view_border(view);
1062 			update_panels();
1063 			doupdate();
1064 			show_panel(view->child->panel);
1065 			nlines = view->nlines;
1066 		}
1067 	} else if (view->parent == NULL)
1068 		ncols = COLS;
1069 
1070 	if (view->resize && dif > 0) {
1071 		err = view->resize(view, dif);
1072 		if (err)
1073 			return err;
1074 	}
1075 
1076 	if (wresize(view->window, nlines, ncols) == ERR)
1077 		return got_error_from_errno("wresize");
1078 	if (replace_panel(view->panel, view->window) == ERR)
1079 		return got_error_from_errno("replace_panel");
1080 	wclear(view->window);
1081 
1082 	view->nlines = nlines;
1083 	view->ncols = ncols;
1084 	view->lines = LINES;
1085 	view->cols = COLS;
1086 
1087 	return NULL;
1088 }
1089 
1090 static const struct got_error *
1091 resize_log_view(struct tog_view *view, int increase)
1092 {
1093 	struct tog_log_view_state	*s = &view->state.log;
1094 	const struct got_error		*err = NULL;
1095 	int				 n = 0;
1096 
1097 	if (s->selected_entry)
1098 		n = s->selected_entry->idx + view->lines - s->selected;
1099 
1100 	/*
1101 	 * Request commits to account for the increased
1102 	 * height so we have enough to populate the view.
1103 	 */
1104 	if (s->commits->ncommits < n) {
1105 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1106 		err = request_log_commits(view);
1107 	}
1108 
1109 	return err;
1110 }
1111 
1112 static void
1113 view_adjust_offset(struct tog_view *view, int n)
1114 {
1115 	if (n == 0)
1116 		return;
1117 
1118 	if (view->parent && view->parent->offset) {
1119 		if (view->parent->offset + n >= 0)
1120 			view->parent->offset += n;
1121 		else
1122 			view->parent->offset = 0;
1123 	} else if (view->offset) {
1124 		if (view->offset - n >= 0)
1125 			view->offset -= n;
1126 		else
1127 			view->offset = 0;
1128 	}
1129 }
1130 
1131 static const struct got_error *
1132 view_resize_split(struct tog_view *view, int resize)
1133 {
1134 	const struct got_error	*err = NULL;
1135 	struct tog_view		*v = NULL;
1136 
1137 	if (view->parent)
1138 		v = view->parent;
1139 	else
1140 		v = view;
1141 
1142 	if (!v->child || !view_is_splitscreen(v->child))
1143 		return NULL;
1144 
1145 	v->resized = v->child->resized = resize;  /* lock for resize event */
1146 
1147 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1148 		if (v->child->resized_y)
1149 			v->child->begin_y = v->child->resized_y;
1150 		if (view->parent)
1151 			v->child->begin_y -= resize;
1152 		else
1153 			v->child->begin_y += resize;
1154 		if (v->child->begin_y < 3) {
1155 			view->count = 0;
1156 			v->child->begin_y = 3;
1157 		} else if (v->child->begin_y > LINES - 1) {
1158 			view->count = 0;
1159 			v->child->begin_y = LINES - 1;
1160 		}
1161 		v->ncols = COLS;
1162 		v->child->ncols = COLS;
1163 		view_adjust_offset(view, resize);
1164 		err = view_init_hsplit(v, v->child->begin_y);
1165 		if (err)
1166 			return err;
1167 		v->child->resized_y = v->child->begin_y;
1168 	} else {
1169 		if (v->child->resized_x)
1170 			v->child->begin_x = v->child->resized_x;
1171 		if (view->parent)
1172 			v->child->begin_x -= resize;
1173 		else
1174 			v->child->begin_x += resize;
1175 		if (v->child->begin_x < 11) {
1176 			view->count = 0;
1177 			v->child->begin_x = 11;
1178 		} else if (v->child->begin_x > COLS - 1) {
1179 			view->count = 0;
1180 			v->child->begin_x = COLS - 1;
1181 		}
1182 		v->child->resized_x = v->child->begin_x;
1183 	}
1184 
1185 	v->child->mode = v->mode;
1186 	v->child->nlines = v->lines - v->child->begin_y;
1187 	v->child->ncols = v->cols - v->child->begin_x;
1188 	v->focus_child = 1;
1189 
1190 	err = view_fullscreen(v);
1191 	if (err)
1192 		return err;
1193 	err = view_splitscreen(v->child);
1194 	if (err)
1195 		return err;
1196 
1197 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1198 		err = offset_selection_down(v->child);
1199 		if (err)
1200 			return err;
1201 	}
1202 
1203 	if (v->resize)
1204 		err = v->resize(v, 0);
1205 	else if (v->child->resize)
1206 		err = v->child->resize(v->child, 0);
1207 
1208 	v->resized = v->child->resized = 0;
1209 
1210 	return err;
1211 }
1212 
1213 static void
1214 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1215 {
1216 	struct tog_view *v = src->child ? src->child : src;
1217 
1218 	dst->resized_x = v->resized_x;
1219 	dst->resized_y = v->resized_y;
1220 }
1221 
1222 static const struct got_error *
1223 view_close_child(struct tog_view *view)
1224 {
1225 	const struct got_error *err = NULL;
1226 
1227 	if (view->child == NULL)
1228 		return NULL;
1229 
1230 	err = view_close(view->child);
1231 	view->child = NULL;
1232 	return err;
1233 }
1234 
1235 static const struct got_error *
1236 view_set_child(struct tog_view *view, struct tog_view *child)
1237 {
1238 	const struct got_error *err = NULL;
1239 
1240 	view->child = child;
1241 	child->parent = view;
1242 
1243 	err = view_resize(view);
1244 	if (err)
1245 		return err;
1246 
1247 	if (view->child->resized_x || view->child->resized_y)
1248 		err = view_resize_split(view, 0);
1249 
1250 	return err;
1251 }
1252 
1253 static const struct got_error *view_dispatch_request(struct tog_view **,
1254     struct tog_view *, enum tog_view_type, int, int);
1255 
1256 static const struct got_error *
1257 view_request_new(struct tog_view **requested, struct tog_view *view,
1258     enum tog_view_type request)
1259 {
1260 	struct tog_view		*new_view = NULL;
1261 	const struct got_error	*err;
1262 	int			 y = 0, x = 0;
1263 
1264 	*requested = NULL;
1265 
1266 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1267 		view_get_split(view, &y, &x);
1268 
1269 	err = view_dispatch_request(&new_view, view, request, y, x);
1270 	if (err)
1271 		return err;
1272 
1273 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1274 	    request != TOG_VIEW_HELP) {
1275 		err = view_init_hsplit(view, y);
1276 		if (err)
1277 			return err;
1278 	}
1279 
1280 	view->focussed = 0;
1281 	new_view->focussed = 1;
1282 	new_view->mode = view->mode;
1283 	new_view->nlines = request == TOG_VIEW_HELP ?
1284 	    view->lines : view->lines - y;
1285 
1286 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1287 		view_transfer_size(new_view, view);
1288 		err = view_close_child(view);
1289 		if (err)
1290 			return err;
1291 		err = view_set_child(view, new_view);
1292 		if (err)
1293 			return err;
1294 		view->focus_child = 1;
1295 	} else
1296 		*requested = new_view;
1297 
1298 	return NULL;
1299 }
1300 
1301 static void
1302 tog_resizeterm(void)
1303 {
1304 	int cols, lines;
1305 	struct winsize size;
1306 
1307 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1308 		cols = 80;     /* Default */
1309 		lines = 24;
1310 	} else {
1311 		cols = size.ws_col;
1312 		lines = size.ws_row;
1313 	}
1314 	resize_term(lines, cols);
1315 }
1316 
1317 static const struct got_error *
1318 view_search_start(struct tog_view *view, int fast_refresh)
1319 {
1320 	const struct got_error *err = NULL;
1321 	struct tog_view *v = view;
1322 	char pattern[1024];
1323 	int ret;
1324 
1325 	if (view->search_started) {
1326 		regfree(&view->regex);
1327 		view->searching = 0;
1328 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1329 	}
1330 	view->search_started = 0;
1331 
1332 	if (view->nlines < 1)
1333 		return NULL;
1334 
1335 	if (view_is_hsplit_top(view))
1336 		v = view->child;
1337 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1338 		v = view->parent;
1339 
1340 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1341 	wclrtoeol(v->window);
1342 
1343 	nodelay(v->window, FALSE);  /* block for search term input */
1344 	nocbreak();
1345 	echo();
1346 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1347 	wrefresh(v->window);
1348 	cbreak();
1349 	noecho();
1350 	nodelay(v->window, TRUE);
1351 	if (!fast_refresh && !using_mock_io)
1352 		halfdelay(10);
1353 	if (ret == ERR)
1354 		return NULL;
1355 
1356 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1357 		err = view->search_start(view);
1358 		if (err) {
1359 			regfree(&view->regex);
1360 			return err;
1361 		}
1362 		view->search_started = 1;
1363 		view->searching = TOG_SEARCH_FORWARD;
1364 		view->search_next_done = 0;
1365 		view->search_next(view);
1366 	}
1367 
1368 	return NULL;
1369 }
1370 
1371 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1372 static const struct got_error *
1373 switch_split(struct tog_view *view)
1374 {
1375 	const struct got_error	*err = NULL;
1376 	struct tog_view		*v = NULL;
1377 
1378 	if (view->parent)
1379 		v = view->parent;
1380 	else
1381 		v = view;
1382 
1383 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1384 		v->mode = TOG_VIEW_SPLIT_VERT;
1385 	else
1386 		v->mode = TOG_VIEW_SPLIT_HRZN;
1387 
1388 	if (!v->child)
1389 		return NULL;
1390 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1391 		v->mode = TOG_VIEW_SPLIT_NONE;
1392 
1393 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1394 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1395 		v->child->begin_y = v->child->resized_y;
1396 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1397 		v->child->begin_x = v->child->resized_x;
1398 
1399 
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1401 		v->ncols = COLS;
1402 		v->child->ncols = COLS;
1403 		v->child->nscrolled = LINES - v->child->nlines;
1404 
1405 		err = view_init_hsplit(v, v->child->begin_y);
1406 		if (err)
1407 			return err;
1408 	}
1409 	v->child->mode = v->mode;
1410 	v->child->nlines = v->lines - v->child->begin_y;
1411 	v->focus_child = 1;
1412 
1413 	err = view_fullscreen(v);
1414 	if (err)
1415 		return err;
1416 	err = view_splitscreen(v->child);
1417 	if (err)
1418 		return err;
1419 
1420 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1421 		v->mode = TOG_VIEW_SPLIT_VERT;
1422 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1423 		err = offset_selection_down(v);
1424 		if (err)
1425 			return err;
1426 		err = offset_selection_down(v->child);
1427 		if (err)
1428 			return err;
1429 	} else {
1430 		offset_selection_up(v);
1431 		offset_selection_up(v->child);
1432 	}
1433 	if (v->resize)
1434 		err = v->resize(v, 0);
1435 	else if (v->child->resize)
1436 		err = v->child->resize(v->child, 0);
1437 
1438 	return err;
1439 }
1440 
1441 /*
1442  * Strip trailing whitespace from str starting at byte *n;
1443  * if *n < 0, use strlen(str). Return new str length in *n.
1444  */
1445 static void
1446 strip_trailing_ws(char *str, int *n)
1447 {
1448 	size_t x = *n;
1449 
1450 	if (str == NULL || *str == '\0')
1451 		return;
1452 
1453 	if (x < 0)
1454 		x = strlen(str);
1455 
1456 	while (x-- > 0 && isspace((unsigned char)str[x]))
1457 		str[x] = '\0';
1458 
1459 	*n = x + 1;
1460 }
1461 
1462 /*
1463  * Extract visible substring of line y from the curses screen
1464  * and strip trailing whitespace. If vline is set, overwrite
1465  * line[vline] with '|' because the ACS_VLINE character is
1466  * written out as 'x'. Write the line to file f.
1467  */
1468 static const struct got_error *
1469 view_write_line(FILE *f, int y, int vline)
1470 {
1471 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1472 	int	r, w;
1473 
1474 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1475 	if (r == ERR)
1476 		return got_error_fmt(GOT_ERR_RANGE,
1477 		    "failed to extract line %d", y);
1478 
1479 	/*
1480 	 * In some views, lines are padded with blanks to COLS width.
1481 	 * Strip them so we can diff without the -b flag when testing.
1482 	 */
1483 	strip_trailing_ws(line, &r);
1484 
1485 	if (vline > 0)
1486 		line[vline] = '|';
1487 
1488 	w = fprintf(f, "%s\n", line);
1489 	if (w != r + 1)		/* \n */
1490 		return got_ferror(f, GOT_ERR_IO);
1491 
1492 	return NULL;
1493 }
1494 
1495 /*
1496  * Capture the visible curses screen by writing each line to the
1497  * file at the path set via the TOG_SCR_DUMP environment variable.
1498  */
1499 static const struct got_error *
1500 screendump(struct tog_view *view)
1501 {
1502 	const struct got_error	*err;
1503 	int			 i;
1504 
1505 	err = got_opentemp_truncate(tog_io.sdump);
1506 	if (err)
1507 		return err;
1508 
1509 	if ((view->child && view->child->begin_x) ||
1510 	    (view->parent && view->begin_x)) {
1511 		int ncols = view->child ? view->ncols : view->parent->ncols;
1512 
1513 		/* vertical splitscreen */
1514 		for (i = 0; i < view->nlines; ++i) {
1515 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1516 			if (err)
1517 				goto done;
1518 		}
1519 	} else {
1520 		int hline = 0;
1521 
1522 		/* fullscreen or horizontal splitscreen */
1523 		if ((view->child && view->child->begin_y) ||
1524 		    (view->parent && view->begin_y))	/* hsplit */
1525 			hline = view->child ?
1526 			    view->child->begin_y : view->begin_y;
1527 
1528 		for (i = 0; i < view->lines; i++) {
1529 			if (hline && i == hline - 1) {
1530 				int c;
1531 
1532 				/* ACS_HLINE writes out as 'q', overwrite it */
1533 				for (c = 0; c < view->cols; ++c)
1534 					fputc('-', tog_io.sdump);
1535 				fputc('\n', tog_io.sdump);
1536 				continue;
1537 			}
1538 
1539 			err = view_write_line(tog_io.sdump, i, 0);
1540 			if (err)
1541 				goto done;
1542 		}
1543 	}
1544 
1545 done:
1546 	return err;
1547 }
1548 
1549 /*
1550  * Compute view->count from numeric input. Assign total to view->count and
1551  * return first non-numeric key entered.
1552  */
1553 static int
1554 get_compound_key(struct tog_view *view, int c)
1555 {
1556 	struct tog_view	*v = view;
1557 	int		 x, n = 0;
1558 
1559 	if (view_is_hsplit_top(view))
1560 		v = view->child;
1561 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1562 		v = view->parent;
1563 
1564 	view->count = 0;
1565 	cbreak();  /* block for input */
1566 	nodelay(view->window, FALSE);
1567 	wmove(v->window, v->nlines - 1, 0);
1568 	wclrtoeol(v->window);
1569 	waddch(v->window, ':');
1570 
1571 	do {
1572 		x = getcurx(v->window);
1573 		if (x != ERR && x < view->ncols) {
1574 			waddch(v->window, c);
1575 			wrefresh(v->window);
1576 		}
1577 
1578 		/*
1579 		 * Don't overflow. Max valid request should be the greatest
1580 		 * between the longest and total lines; cap at 10 million.
1581 		 */
1582 		if (n >= 9999999)
1583 			n = 9999999;
1584 		else
1585 			n = n * 10 + (c - '0');
1586 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1587 
1588 	if (c == 'G' || c == 'g') {	/* nG key map */
1589 		view->gline = view->hiline = n;
1590 		n = 0;
1591 		c = 0;
1592 	}
1593 
1594 	/* Massage excessive or inapplicable values at the input handler. */
1595 	view->count = n;
1596 
1597 	return c;
1598 }
1599 
1600 static void
1601 action_report(struct tog_view *view)
1602 {
1603 	struct tog_view *v = view;
1604 
1605 	if (view_is_hsplit_top(view))
1606 		v = view->child;
1607 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1608 		v = view->parent;
1609 
1610 	wmove(v->window, v->nlines - 1, 0);
1611 	wclrtoeol(v->window);
1612 	wprintw(v->window, ":%s", view->action);
1613 	wrefresh(v->window);
1614 
1615 	/*
1616 	 * Clear action status report. Only clear in blame view
1617 	 * once annotating is complete, otherwise it's too fast.
1618 	 */
1619 	if (view->type == TOG_VIEW_BLAME) {
1620 		if (view->state.blame.blame_complete)
1621 			view->action = NULL;
1622 	} else
1623 		view->action = NULL;
1624 }
1625 
1626 /*
1627  * Read the next line from the test script and assign
1628  * key instruction to *ch. If at EOF, set the *done flag.
1629  */
1630 static const struct got_error *
1631 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1632 {
1633 	const struct got_error	*err = NULL;
1634 	char			*line = NULL;
1635 	size_t			 linesz = 0;
1636 
1637 	if (view->count && --view->count) {
1638 		*ch = view->ch;
1639 		return NULL;
1640 	} else
1641 		*ch = -1;
1642 
1643 	if (getline(&line, &linesz, script) == -1) {
1644 		if (feof(script)) {
1645 			*done = 1;
1646 			goto done;
1647 		} else {
1648 			err = got_ferror(script, GOT_ERR_IO);
1649 			goto done;
1650 		}
1651 	}
1652 
1653 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1654 		tog_io.wait_for_ui = 1;
1655 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1656 		*ch = KEY_ENTER;
1657 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1658 		*ch = KEY_RIGHT;
1659 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1660 		*ch = KEY_LEFT;
1661 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1662 		*ch = KEY_DOWN;
1663 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1664 		*ch = KEY_UP;
1665 	else if (strncasecmp(line, "TAB", 3) == 0)
1666 		*ch = '\t';
1667 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1668 		*ch = TOG_KEY_SCRDUMP;
1669 	else if (isdigit((unsigned char)*line)) {
1670 		char *t = line;
1671 
1672 		while (isdigit((unsigned char)*t))
1673 			++t;
1674 		view->ch = *ch = *t;
1675 		*t = '\0';
1676 		/* ignore error, view->count is 0 if instruction is invalid */
1677 		view->count = strtonum(line, 0, INT_MAX, NULL);
1678 	} else
1679 		*ch = *line;
1680 
1681 done:
1682 	free(line);
1683 	return err;
1684 }
1685 
1686 static const struct got_error *
1687 view_input(struct tog_view **new, int *done, struct tog_view *view,
1688     struct tog_view_list_head *views, int fast_refresh)
1689 {
1690 	const struct got_error *err = NULL;
1691 	struct tog_view *v;
1692 	int ch, errcode;
1693 
1694 	*new = NULL;
1695 
1696 	if (view->action)
1697 		action_report(view);
1698 
1699 	/* Clear "no matches" indicator. */
1700 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1701 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1702 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1703 		view->count = 0;
1704 	}
1705 
1706 	if (view->searching && !view->search_next_done) {
1707 		errcode = pthread_mutex_unlock(&tog_mutex);
1708 		if (errcode)
1709 			return got_error_set_errno(errcode,
1710 			    "pthread_mutex_unlock");
1711 		sched_yield();
1712 		errcode = pthread_mutex_lock(&tog_mutex);
1713 		if (errcode)
1714 			return got_error_set_errno(errcode,
1715 			    "pthread_mutex_lock");
1716 		view->search_next(view);
1717 		return NULL;
1718 	}
1719 
1720 	/* Allow threads to make progress while we are waiting for input. */
1721 	errcode = pthread_mutex_unlock(&tog_mutex);
1722 	if (errcode)
1723 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1724 
1725 	if (using_mock_io) {
1726 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1727 		if (err) {
1728 			errcode = pthread_mutex_lock(&tog_mutex);
1729 			return err;
1730 		}
1731 	} else if (view->count && --view->count) {
1732 		cbreak();
1733 		nodelay(view->window, TRUE);
1734 		ch = wgetch(view->window);
1735 		/* let C-g or backspace abort unfinished count */
1736 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1737 			view->count = 0;
1738 		else
1739 			ch = view->ch;
1740 	} else {
1741 		ch = wgetch(view->window);
1742 		if (ch >= '1' && ch  <= '9')
1743 			view->ch = ch = get_compound_key(view, ch);
1744 	}
1745 	if (view->hiline && ch != ERR && ch != 0)
1746 		view->hiline = 0;  /* key pressed, clear line highlight */
1747 	nodelay(view->window, TRUE);
1748 	errcode = pthread_mutex_lock(&tog_mutex);
1749 	if (errcode)
1750 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1751 
1752 	if (tog_sigwinch_received || tog_sigcont_received) {
1753 		tog_resizeterm();
1754 		tog_sigwinch_received = 0;
1755 		tog_sigcont_received = 0;
1756 		TAILQ_FOREACH(v, views, entry) {
1757 			err = view_resize(v);
1758 			if (err)
1759 				return err;
1760 			err = v->input(new, v, KEY_RESIZE);
1761 			if (err)
1762 				return err;
1763 			if (v->child) {
1764 				err = view_resize(v->child);
1765 				if (err)
1766 					return err;
1767 				err = v->child->input(new, v->child,
1768 				    KEY_RESIZE);
1769 				if (err)
1770 					return err;
1771 				if (v->child->resized_x || v->child->resized_y) {
1772 					err = view_resize_split(v, 0);
1773 					if (err)
1774 						return err;
1775 				}
1776 			}
1777 		}
1778 	}
1779 
1780 	switch (ch) {
1781 	case '?':
1782 	case 'H':
1783 	case KEY_F(1):
1784 		if (view->type == TOG_VIEW_HELP)
1785 			err = view->reset(view);
1786 		else
1787 			err = view_request_new(new, view, TOG_VIEW_HELP);
1788 		break;
1789 	case '\t':
1790 		view->count = 0;
1791 		if (view->child) {
1792 			view->focussed = 0;
1793 			view->child->focussed = 1;
1794 			view->focus_child = 1;
1795 		} else if (view->parent) {
1796 			view->focussed = 0;
1797 			view->parent->focussed = 1;
1798 			view->parent->focus_child = 0;
1799 			if (!view_is_splitscreen(view)) {
1800 				if (view->parent->resize) {
1801 					err = view->parent->resize(view->parent,
1802 					    0);
1803 					if (err)
1804 						return err;
1805 				}
1806 				offset_selection_up(view->parent);
1807 				err = view_fullscreen(view->parent);
1808 				if (err)
1809 					return err;
1810 			}
1811 		}
1812 		break;
1813 	case 'q':
1814 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1815 			if (view->parent->resize) {
1816 				/* might need more commits to fill fullscreen */
1817 				err = view->parent->resize(view->parent, 0);
1818 				if (err)
1819 					break;
1820 			}
1821 			offset_selection_up(view->parent);
1822 		}
1823 		err = view->input(new, view, ch);
1824 		view->dying = 1;
1825 		break;
1826 	case 'Q':
1827 		*done = 1;
1828 		break;
1829 	case 'F':
1830 		view->count = 0;
1831 		if (view_is_parent_view(view)) {
1832 			if (view->child == NULL)
1833 				break;
1834 			if (view_is_splitscreen(view->child)) {
1835 				view->focussed = 0;
1836 				view->child->focussed = 1;
1837 				err = view_fullscreen(view->child);
1838 			} else {
1839 				err = view_splitscreen(view->child);
1840 				if (!err)
1841 					err = view_resize_split(view, 0);
1842 			}
1843 			if (err)
1844 				break;
1845 			err = view->child->input(new, view->child,
1846 			    KEY_RESIZE);
1847 		} else {
1848 			if (view_is_splitscreen(view)) {
1849 				view->parent->focussed = 0;
1850 				view->focussed = 1;
1851 				err = view_fullscreen(view);
1852 			} else {
1853 				err = view_splitscreen(view);
1854 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1855 					err = view_resize(view->parent);
1856 				if (!err)
1857 					err = view_resize_split(view, 0);
1858 			}
1859 			if (err)
1860 				break;
1861 			err = view->input(new, view, KEY_RESIZE);
1862 		}
1863 		if (err)
1864 			break;
1865 		if (view->resize) {
1866 			err = view->resize(view, 0);
1867 			if (err)
1868 				break;
1869 		}
1870 		if (view->parent) {
1871 			if (view->parent->resize) {
1872 				err = view->parent->resize(view->parent, 0);
1873 				if (err != NULL)
1874 					break;
1875 			}
1876 			err = offset_selection_down(view->parent);
1877 			if (err != NULL)
1878 				break;
1879 		}
1880 		err = offset_selection_down(view);
1881 		break;
1882 	case 'S':
1883 		view->count = 0;
1884 		err = switch_split(view);
1885 		break;
1886 	case '-':
1887 		err = view_resize_split(view, -1);
1888 		break;
1889 	case '+':
1890 		err = view_resize_split(view, 1);
1891 		break;
1892 	case KEY_RESIZE:
1893 		break;
1894 	case '/':
1895 		view->count = 0;
1896 		if (view->search_start)
1897 			view_search_start(view, fast_refresh);
1898 		else
1899 			err = view->input(new, view, ch);
1900 		break;
1901 	case 'N':
1902 	case 'n':
1903 		if (view->search_started && view->search_next) {
1904 			view->searching = (ch == 'n' ?
1905 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1906 			view->search_next_done = 0;
1907 			view->search_next(view);
1908 		} else
1909 			err = view->input(new, view, ch);
1910 		break;
1911 	case 'A':
1912 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1913 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1914 			view->action = "Patience diff algorithm";
1915 		} else {
1916 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1917 			view->action = "Myers diff algorithm";
1918 		}
1919 		TAILQ_FOREACH(v, views, entry) {
1920 			if (v->reset) {
1921 				err = v->reset(v);
1922 				if (err)
1923 					return err;
1924 			}
1925 			if (v->child && v->child->reset) {
1926 				err = v->child->reset(v->child);
1927 				if (err)
1928 					return err;
1929 			}
1930 		}
1931 		break;
1932 	case TOG_KEY_SCRDUMP:
1933 		err = screendump(view);
1934 		break;
1935 	default:
1936 		err = view->input(new, view, ch);
1937 		break;
1938 	}
1939 
1940 	return err;
1941 }
1942 
1943 static int
1944 view_needs_focus_indication(struct tog_view *view)
1945 {
1946 	if (view_is_parent_view(view)) {
1947 		if (view->child == NULL || view->child->focussed)
1948 			return 0;
1949 		if (!view_is_splitscreen(view->child))
1950 			return 0;
1951 	} else if (!view_is_splitscreen(view))
1952 		return 0;
1953 
1954 	return view->focussed;
1955 }
1956 
1957 static const struct got_error *
1958 tog_io_close(void)
1959 {
1960 	const struct got_error *err = NULL;
1961 
1962 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1963 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1964 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1965 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1966 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1967 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1968 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1969 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1970 
1971 	return err;
1972 }
1973 
1974 static const struct got_error *
1975 view_loop(struct tog_view *view)
1976 {
1977 	const struct got_error *err = NULL;
1978 	struct tog_view_list_head views;
1979 	struct tog_view *new_view;
1980 	char *mode;
1981 	int fast_refresh = 10;
1982 	int done = 0, errcode;
1983 
1984 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1985 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1986 		view->mode = TOG_VIEW_SPLIT_VERT;
1987 	else
1988 		view->mode = TOG_VIEW_SPLIT_HRZN;
1989 
1990 	errcode = pthread_mutex_lock(&tog_mutex);
1991 	if (errcode)
1992 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1993 
1994 	TAILQ_INIT(&views);
1995 	TAILQ_INSERT_HEAD(&views, view, entry);
1996 
1997 	view->focussed = 1;
1998 	err = view->show(view);
1999 	if (err)
2000 		return err;
2001 	update_panels();
2002 	doupdate();
2003 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2004 	    !tog_fatal_signal_received()) {
2005 		/* Refresh fast during initialization, then become slower. */
2006 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2007 			halfdelay(10); /* switch to once per second */
2008 
2009 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2010 		if (err)
2011 			break;
2012 
2013 		if (view->dying && view == TAILQ_FIRST(&views) &&
2014 		    TAILQ_NEXT(view, entry) == NULL)
2015 			done = 1;
2016 		if (done) {
2017 			struct tog_view *v;
2018 
2019 			/*
2020 			 * When we quit, scroll the screen up a single line
2021 			 * so we don't lose any information.
2022 			 */
2023 			TAILQ_FOREACH(v, &views, entry) {
2024 				wmove(v->window, 0, 0);
2025 				wdeleteln(v->window);
2026 				wnoutrefresh(v->window);
2027 				if (v->child && !view_is_fullscreen(v)) {
2028 					wmove(v->child->window, 0, 0);
2029 					wdeleteln(v->child->window);
2030 					wnoutrefresh(v->child->window);
2031 				}
2032 			}
2033 			doupdate();
2034 		}
2035 
2036 		if (view->dying) {
2037 			struct tog_view *v, *prev = NULL;
2038 
2039 			if (view_is_parent_view(view))
2040 				prev = TAILQ_PREV(view, tog_view_list_head,
2041 				    entry);
2042 			else if (view->parent)
2043 				prev = view->parent;
2044 
2045 			if (view->parent) {
2046 				view->parent->child = NULL;
2047 				view->parent->focus_child = 0;
2048 				/* Restore fullscreen line height. */
2049 				view->parent->nlines = view->parent->lines;
2050 				err = view_resize(view->parent);
2051 				if (err)
2052 					break;
2053 				/* Make resized splits persist. */
2054 				view_transfer_size(view->parent, view);
2055 			} else
2056 				TAILQ_REMOVE(&views, view, entry);
2057 
2058 			err = view_close(view);
2059 			if (err)
2060 				goto done;
2061 
2062 			view = NULL;
2063 			TAILQ_FOREACH(v, &views, entry) {
2064 				if (v->focussed)
2065 					break;
2066 			}
2067 			if (view == NULL && new_view == NULL) {
2068 				/* No view has focus. Try to pick one. */
2069 				if (prev)
2070 					view = prev;
2071 				else if (!TAILQ_EMPTY(&views)) {
2072 					view = TAILQ_LAST(&views,
2073 					    tog_view_list_head);
2074 				}
2075 				if (view) {
2076 					if (view->focus_child) {
2077 						view->child->focussed = 1;
2078 						view = view->child;
2079 					} else
2080 						view->focussed = 1;
2081 				}
2082 			}
2083 		}
2084 		if (new_view) {
2085 			struct tog_view *v, *t;
2086 			/* Only allow one parent view per type. */
2087 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2088 				if (v->type != new_view->type)
2089 					continue;
2090 				TAILQ_REMOVE(&views, v, entry);
2091 				err = view_close(v);
2092 				if (err)
2093 					goto done;
2094 				break;
2095 			}
2096 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2097 			view = new_view;
2098 		}
2099 		if (view && !done) {
2100 			if (view_is_parent_view(view)) {
2101 				if (view->child && view->child->focussed)
2102 					view = view->child;
2103 			} else {
2104 				if (view->parent && view->parent->focussed)
2105 					view = view->parent;
2106 			}
2107 			show_panel(view->panel);
2108 			if (view->child && view_is_splitscreen(view->child))
2109 				show_panel(view->child->panel);
2110 			if (view->parent && view_is_splitscreen(view)) {
2111 				err = view->parent->show(view->parent);
2112 				if (err)
2113 					goto done;
2114 			}
2115 			err = view->show(view);
2116 			if (err)
2117 				goto done;
2118 			if (view->child) {
2119 				err = view->child->show(view->child);
2120 				if (err)
2121 					goto done;
2122 			}
2123 			update_panels();
2124 			doupdate();
2125 		}
2126 	}
2127 done:
2128 	while (!TAILQ_EMPTY(&views)) {
2129 		const struct got_error *close_err;
2130 		view = TAILQ_FIRST(&views);
2131 		TAILQ_REMOVE(&views, view, entry);
2132 		close_err = view_close(view);
2133 		if (close_err && err == NULL)
2134 			err = close_err;
2135 	}
2136 
2137 	errcode = pthread_mutex_unlock(&tog_mutex);
2138 	if (errcode && err == NULL)
2139 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2140 
2141 	return err;
2142 }
2143 
2144 __dead static void
2145 usage_log(void)
2146 {
2147 	endwin();
2148 	fprintf(stderr,
2149 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2150 	    getprogname());
2151 	exit(1);
2152 }
2153 
2154 /* Create newly allocated wide-character string equivalent to a byte string. */
2155 static const struct got_error *
2156 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2157 {
2158 	char *vis = NULL;
2159 	const struct got_error *err = NULL;
2160 
2161 	*ws = NULL;
2162 	*wlen = mbstowcs(NULL, s, 0);
2163 	if (*wlen == (size_t)-1) {
2164 		int vislen;
2165 		if (errno != EILSEQ)
2166 			return got_error_from_errno("mbstowcs");
2167 
2168 		/* byte string invalid in current encoding; try to "fix" it */
2169 		err = got_mbsavis(&vis, &vislen, s);
2170 		if (err)
2171 			return err;
2172 		*wlen = mbstowcs(NULL, vis, 0);
2173 		if (*wlen == (size_t)-1) {
2174 			err = got_error_from_errno("mbstowcs"); /* give up */
2175 			goto done;
2176 		}
2177 	}
2178 
2179 	*ws = calloc(*wlen + 1, sizeof(**ws));
2180 	if (*ws == NULL) {
2181 		err = got_error_from_errno("calloc");
2182 		goto done;
2183 	}
2184 
2185 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2186 		err = got_error_from_errno("mbstowcs");
2187 done:
2188 	free(vis);
2189 	if (err) {
2190 		free(*ws);
2191 		*ws = NULL;
2192 		*wlen = 0;
2193 	}
2194 	return err;
2195 }
2196 
2197 static const struct got_error *
2198 expand_tab(char **ptr, const char *src)
2199 {
2200 	char	*dst;
2201 	size_t	 len, n, idx = 0, sz = 0;
2202 
2203 	*ptr = NULL;
2204 	n = len = strlen(src);
2205 	dst = malloc(n + 1);
2206 	if (dst == NULL)
2207 		return got_error_from_errno("malloc");
2208 
2209 	while (idx < len && src[idx]) {
2210 		const char c = src[idx];
2211 
2212 		if (c == '\t') {
2213 			size_t nb = TABSIZE - sz % TABSIZE;
2214 			char *p;
2215 
2216 			p = realloc(dst, n + nb);
2217 			if (p == NULL) {
2218 				free(dst);
2219 				return got_error_from_errno("realloc");
2220 
2221 			}
2222 			dst = p;
2223 			n += nb;
2224 			memset(dst + sz, ' ', nb);
2225 			sz += nb;
2226 		} else
2227 			dst[sz++] = src[idx];
2228 		++idx;
2229 	}
2230 
2231 	dst[sz] = '\0';
2232 	*ptr = dst;
2233 	return NULL;
2234 }
2235 
2236 /*
2237  * Advance at most n columns from wline starting at offset off.
2238  * Return the index to the first character after the span operation.
2239  * Return the combined column width of all spanned wide characters in
2240  * *rcol.
2241  */
2242 static int
2243 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2244 {
2245 	int width, i, cols = 0;
2246 
2247 	if (n == 0) {
2248 		*rcol = cols;
2249 		return off;
2250 	}
2251 
2252 	for (i = off; wline[i] != L'\0'; ++i) {
2253 		if (wline[i] == L'\t')
2254 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2255 		else
2256 			width = wcwidth(wline[i]);
2257 
2258 		if (width == -1) {
2259 			width = 1;
2260 			wline[i] = L'.';
2261 		}
2262 
2263 		if (cols + width > n)
2264 			break;
2265 		cols += width;
2266 	}
2267 
2268 	*rcol = cols;
2269 	return i;
2270 }
2271 
2272 /*
2273  * Format a line for display, ensuring that it won't overflow a width limit.
2274  * With scrolling, the width returned refers to the scrolled version of the
2275  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2276  */
2277 static const struct got_error *
2278 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2279     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2280 {
2281 	const struct got_error *err = NULL;
2282 	int cols;
2283 	wchar_t *wline = NULL;
2284 	char *exstr = NULL;
2285 	size_t wlen;
2286 	int i, scrollx;
2287 
2288 	*wlinep = NULL;
2289 	*widthp = 0;
2290 
2291 	if (expand) {
2292 		err = expand_tab(&exstr, line);
2293 		if (err)
2294 			return err;
2295 	}
2296 
2297 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2298 	free(exstr);
2299 	if (err)
2300 		return err;
2301 
2302 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2303 
2304 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2305 		wline[wlen - 1] = L'\0';
2306 		wlen--;
2307 	}
2308 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2309 		wline[wlen - 1] = L'\0';
2310 		wlen--;
2311 	}
2312 
2313 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2314 	wline[i] = L'\0';
2315 
2316 	if (widthp)
2317 		*widthp = cols;
2318 	if (scrollxp)
2319 		*scrollxp = scrollx;
2320 	if (err)
2321 		free(wline);
2322 	else
2323 		*wlinep = wline;
2324 	return err;
2325 }
2326 
2327 static const struct got_error*
2328 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2329     struct got_object_id *id, struct got_repository *repo)
2330 {
2331 	static const struct got_error *err = NULL;
2332 	struct got_reflist_entry *re;
2333 	char *s;
2334 	const char *name;
2335 
2336 	*refs_str = NULL;
2337 
2338 	if (refs == NULL)
2339 		return NULL;
2340 
2341 	TAILQ_FOREACH(re, refs, entry) {
2342 		struct got_tag_object *tag = NULL;
2343 		struct got_object_id *ref_id;
2344 		int cmp;
2345 
2346 		name = got_ref_get_name(re->ref);
2347 		if (strcmp(name, GOT_REF_HEAD) == 0)
2348 			continue;
2349 		if (strncmp(name, "refs/", 5) == 0)
2350 			name += 5;
2351 		if (strncmp(name, "got/", 4) == 0)
2352 			continue;
2353 		if (strncmp(name, "heads/", 6) == 0)
2354 			name += 6;
2355 		if (strncmp(name, "remotes/", 8) == 0) {
2356 			name += 8;
2357 			s = strstr(name, "/" GOT_REF_HEAD);
2358 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2359 				continue;
2360 		}
2361 		err = got_ref_resolve(&ref_id, repo, re->ref);
2362 		if (err)
2363 			break;
2364 		if (strncmp(name, "tags/", 5) == 0) {
2365 			err = got_object_open_as_tag(&tag, repo, ref_id);
2366 			if (err) {
2367 				if (err->code != GOT_ERR_OBJ_TYPE) {
2368 					free(ref_id);
2369 					break;
2370 				}
2371 				/* Ref points at something other than a tag. */
2372 				err = NULL;
2373 				tag = NULL;
2374 			}
2375 		}
2376 		cmp = got_object_id_cmp(tag ?
2377 		    got_object_tag_get_object_id(tag) : ref_id, id);
2378 		free(ref_id);
2379 		if (tag)
2380 			got_object_tag_close(tag);
2381 		if (cmp != 0)
2382 			continue;
2383 		s = *refs_str;
2384 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2385 		    s ? ", " : "", name) == -1) {
2386 			err = got_error_from_errno("asprintf");
2387 			free(s);
2388 			*refs_str = NULL;
2389 			break;
2390 		}
2391 		free(s);
2392 	}
2393 
2394 	return err;
2395 }
2396 
2397 static const struct got_error *
2398 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2399     int col_tab_align)
2400 {
2401 	char *smallerthan;
2402 
2403 	smallerthan = strchr(author, '<');
2404 	if (smallerthan && smallerthan[1] != '\0')
2405 		author = smallerthan + 1;
2406 	author[strcspn(author, "@>")] = '\0';
2407 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2408 	    col_tab_align, 0);
2409 }
2410 
2411 static const struct got_error *
2412 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2413     const size_t date_display_cols, int author_display_cols)
2414 {
2415 	struct tog_log_view_state *s = &view->state.log;
2416 	const struct got_error *err = NULL;
2417 	struct got_commit_object *commit = entry->commit;
2418 	struct got_object_id *id = entry->id;
2419 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2420 	char *refs_str = NULL;
2421 	char *logmsg0 = NULL, *logmsg = NULL;
2422 	char *author = NULL;
2423 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2424 	int author_width, refstr_width, logmsg_width;
2425 	char *newline, *line = NULL;
2426 	int col, limit, scrollx, logmsg_x;
2427 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2428 	struct tm tm;
2429 	time_t committer_time;
2430 	struct tog_color *tc;
2431 	struct got_reflist_head *refs;
2432 
2433 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2434 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2435 		tog_base_commit.idx = entry->idx;
2436 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2437 		int rc;
2438 
2439 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2440 		if (rc)
2441 			return got_error_set_errno(rc, "pthread_cond_wait");
2442 	}
2443 
2444 	committer_time = got_object_commit_get_committer_time(commit);
2445 	if (gmtime_r(&committer_time, &tm) == NULL)
2446 		return got_error_from_errno("gmtime_r");
2447 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2448 		return got_error(GOT_ERR_NO_SPACE);
2449 
2450 	if (avail <= date_display_cols)
2451 		limit = MIN(sizeof(datebuf) - 1, avail);
2452 	else
2453 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2454 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2455 	if (tc)
2456 		wattr_on(view->window,
2457 		    COLOR_PAIR(tc->colorpair), NULL);
2458 	waddnstr(view->window, datebuf, limit);
2459 	if (tc)
2460 		wattr_off(view->window,
2461 		    COLOR_PAIR(tc->colorpair), NULL);
2462 	col = limit;
2463 	if (col > avail)
2464 		goto done;
2465 
2466 	if (avail >= 120) {
2467 		char *id_str;
2468 		err = got_object_id_str(&id_str, id);
2469 		if (err)
2470 			goto done;
2471 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2472 		if (tc)
2473 			wattr_on(view->window,
2474 			    COLOR_PAIR(tc->colorpair), NULL);
2475 		wprintw(view->window, "%.8s ", id_str);
2476 		if (tc)
2477 			wattr_off(view->window,
2478 			    COLOR_PAIR(tc->colorpair), NULL);
2479 		free(id_str);
2480 		col += 9;
2481 		if (col > avail)
2482 			goto done;
2483 	}
2484 
2485 	if (s->use_committer)
2486 		author = strdup(got_object_commit_get_committer(commit));
2487 	else
2488 		author = strdup(got_object_commit_get_author(commit));
2489 	if (author == NULL) {
2490 		err = got_error_from_errno("strdup");
2491 		goto done;
2492 	}
2493 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2494 	if (err)
2495 		goto done;
2496 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2497 	if (tc)
2498 		wattr_on(view->window,
2499 		    COLOR_PAIR(tc->colorpair), NULL);
2500 	waddwstr(view->window, wauthor);
2501 	col += author_width;
2502 	while (col < avail && author_width < author_display_cols + 2) {
2503 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2504 		    author_width == marker_column &&
2505 		    entry->idx == tog_base_commit.idx) {
2506 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2507 			if (tc)
2508 				wattr_on(view->window,
2509 				    COLOR_PAIR(tc->colorpair), NULL);
2510 			waddch(view->window, tog_base_commit.marker);
2511 			if (tc)
2512 				wattr_off(view->window,
2513 				    COLOR_PAIR(tc->colorpair), NULL);
2514 		} else
2515 			waddch(view->window, ' ');
2516 		col++;
2517 		author_width++;
2518 	}
2519 	if (tc)
2520 		wattr_off(view->window,
2521 		    COLOR_PAIR(tc->colorpair), NULL);
2522 	if (col > avail)
2523 		goto done;
2524 
2525 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2526 	if (err)
2527 		goto done;
2528 	logmsg = logmsg0;
2529 	while (*logmsg == '\n')
2530 		logmsg++;
2531 	newline = strchr(logmsg, '\n');
2532 	if (newline)
2533 		*newline = '\0';
2534 
2535 	limit = avail - col;
2536 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2537 		limit--;	/* for the border */
2538 
2539 	/* Prepend reference labels to log message if possible .*/
2540 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2541 	err = build_refs_str(&refs_str, refs, id, s->repo);
2542 	if (err)
2543 		goto done;
2544 	if (refs_str) {
2545 		char *rs;
2546 
2547 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2548 			err = got_error_from_errno("asprintf");
2549 			goto done;
2550 		}
2551 		err = format_line(&wrefstr, &refstr_width,
2552 		    &scrollx, rs, view->x, limit, col, 1);
2553 		free(rs);
2554 		if (err)
2555 			goto done;
2556 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2557 		if (tc)
2558 			wattr_on(view->window,
2559 			    COLOR_PAIR(tc->colorpair), NULL);
2560 		waddwstr(view->window, &wrefstr[scrollx]);
2561 		if (tc)
2562 			wattr_off(view->window,
2563 			    COLOR_PAIR(tc->colorpair), NULL);
2564 		col += MAX(refstr_width, 0);
2565 		if (col > avail)
2566 			goto done;
2567 
2568 		if (col < avail) {
2569 			waddch(view->window, ' ');
2570 			col++;
2571 		}
2572 
2573 		if (refstr_width > 0)
2574 			logmsg_x = 0;
2575 		else {
2576 			int unscrolled_refstr_width;
2577 			size_t len = wcslen(wrefstr);
2578 
2579 			/*
2580 			 * No need to check for -1 return value here since
2581 			 * unprintables have been replaced by span_wline().
2582 			 */
2583 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2584 			unscrolled_refstr_width += 1; /* trailing space */
2585 			logmsg_x = view->x - unscrolled_refstr_width;
2586 		}
2587 
2588 		limit = avail - col;
2589 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2590 			limit--;	/* for the border */
2591 	} else
2592 		logmsg_x = view->x;
2593 
2594 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2595 	    limit, col, 1);
2596 	if (err)
2597 		goto done;
2598 	waddwstr(view->window, &wlogmsg[scrollx]);
2599 	col += MAX(logmsg_width, 0);
2600 	while (col < avail) {
2601 		waddch(view->window, ' ');
2602 		col++;
2603 	}
2604 done:
2605 	free(logmsg0);
2606 	free(wlogmsg);
2607 	free(wrefstr);
2608 	free(refs_str);
2609 	free(author);
2610 	free(wauthor);
2611 	free(line);
2612 	return err;
2613 }
2614 
2615 static struct commit_queue_entry *
2616 alloc_commit_queue_entry(struct got_commit_object *commit,
2617     struct got_object_id *id)
2618 {
2619 	struct commit_queue_entry *entry;
2620 	struct got_object_id *dup;
2621 
2622 	entry = calloc(1, sizeof(*entry));
2623 	if (entry == NULL)
2624 		return NULL;
2625 
2626 	dup = got_object_id_dup(id);
2627 	if (dup == NULL) {
2628 		free(entry);
2629 		return NULL;
2630 	}
2631 
2632 	entry->id = dup;
2633 	entry->commit = commit;
2634 	return entry;
2635 }
2636 
2637 static void
2638 pop_commit(struct commit_queue *commits)
2639 {
2640 	struct commit_queue_entry *entry;
2641 
2642 	entry = TAILQ_FIRST(&commits->head);
2643 	TAILQ_REMOVE(&commits->head, entry, entry);
2644 	got_object_commit_close(entry->commit);
2645 	commits->ncommits--;
2646 	free(entry->id);
2647 	free(entry);
2648 }
2649 
2650 static void
2651 free_commits(struct commit_queue *commits)
2652 {
2653 	while (!TAILQ_EMPTY(&commits->head))
2654 		pop_commit(commits);
2655 }
2656 
2657 static const struct got_error *
2658 match_commit(int *have_match, struct got_object_id *id,
2659     struct got_commit_object *commit, regex_t *regex)
2660 {
2661 	const struct got_error *err = NULL;
2662 	regmatch_t regmatch;
2663 	char *id_str = NULL, *logmsg = NULL;
2664 
2665 	*have_match = 0;
2666 
2667 	err = got_object_id_str(&id_str, id);
2668 	if (err)
2669 		return err;
2670 
2671 	err = got_object_commit_get_logmsg(&logmsg, commit);
2672 	if (err)
2673 		goto done;
2674 
2675 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2676 	    &regmatch, 0) == 0 ||
2677 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2678 	    &regmatch, 0) == 0 ||
2679 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2680 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2681 		*have_match = 1;
2682 done:
2683 	free(id_str);
2684 	free(logmsg);
2685 	return err;
2686 }
2687 
2688 static const struct got_error *
2689 queue_commits(struct tog_log_thread_args *a)
2690 {
2691 	const struct got_error *err = NULL;
2692 
2693 	/*
2694 	 * We keep all commits open throughout the lifetime of the log
2695 	 * view in order to avoid having to re-fetch commits from disk
2696 	 * while updating the display.
2697 	 */
2698 	do {
2699 		struct got_object_id id;
2700 		struct got_commit_object *commit;
2701 		struct commit_queue_entry *entry;
2702 		int limit_match = 0;
2703 		int errcode;
2704 
2705 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2706 		    NULL, NULL);
2707 		if (err)
2708 			break;
2709 
2710 		err = got_object_open_as_commit(&commit, a->repo, &id);
2711 		if (err)
2712 			break;
2713 		entry = alloc_commit_queue_entry(commit, &id);
2714 		if (entry == NULL) {
2715 			err = got_error_from_errno("alloc_commit_queue_entry");
2716 			break;
2717 		}
2718 
2719 		errcode = pthread_mutex_lock(&tog_mutex);
2720 		if (errcode) {
2721 			err = got_error_set_errno(errcode,
2722 			    "pthread_mutex_lock");
2723 			break;
2724 		}
2725 
2726 		entry->idx = a->real_commits->ncommits;
2727 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2728 		a->real_commits->ncommits++;
2729 
2730 		if (*a->limiting) {
2731 			err = match_commit(&limit_match, &id, commit,
2732 			    a->limit_regex);
2733 			if (err)
2734 				break;
2735 
2736 			if (limit_match) {
2737 				struct commit_queue_entry *matched;
2738 
2739 				matched = alloc_commit_queue_entry(
2740 				    entry->commit, entry->id);
2741 				if (matched == NULL) {
2742 					err = got_error_from_errno(
2743 					    "alloc_commit_queue_entry");
2744 					break;
2745 				}
2746 				matched->commit = entry->commit;
2747 				got_object_commit_retain(entry->commit);
2748 
2749 				matched->idx = a->limit_commits->ncommits;
2750 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2751 				    matched, entry);
2752 				a->limit_commits->ncommits++;
2753 			}
2754 
2755 			/*
2756 			 * This is how we signal log_thread() that we
2757 			 * have found a match, and that it should be
2758 			 * counted as a new entry for the view.
2759 			 */
2760 			a->limit_match = limit_match;
2761 		}
2762 
2763 		if (*a->searching == TOG_SEARCH_FORWARD &&
2764 		    !*a->search_next_done) {
2765 			int have_match;
2766 			err = match_commit(&have_match, &id, commit, a->regex);
2767 			if (err)
2768 				break;
2769 
2770 			if (*a->limiting) {
2771 				if (limit_match && have_match)
2772 					*a->search_next_done =
2773 					    TOG_SEARCH_HAVE_MORE;
2774 			} else if (have_match)
2775 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2776 		}
2777 
2778 		errcode = pthread_mutex_unlock(&tog_mutex);
2779 		if (errcode && err == NULL)
2780 			err = got_error_set_errno(errcode,
2781 			    "pthread_mutex_unlock");
2782 		if (err)
2783 			break;
2784 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2785 
2786 	return err;
2787 }
2788 
2789 static void
2790 select_commit(struct tog_log_view_state *s)
2791 {
2792 	struct commit_queue_entry *entry;
2793 	int ncommits = 0;
2794 
2795 	entry = s->first_displayed_entry;
2796 	while (entry) {
2797 		if (ncommits == s->selected) {
2798 			s->selected_entry = entry;
2799 			break;
2800 		}
2801 		entry = TAILQ_NEXT(entry, entry);
2802 		ncommits++;
2803 	}
2804 }
2805 
2806 static const struct got_error *
2807 draw_commits(struct tog_view *view)
2808 {
2809 	const struct got_error *err = NULL;
2810 	struct tog_log_view_state *s = &view->state.log;
2811 	struct commit_queue_entry *entry = s->selected_entry;
2812 	int limit = view->nlines;
2813 	int width;
2814 	int ncommits, author_cols = 4, refstr_cols;
2815 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2816 	char *refs_str = NULL;
2817 	wchar_t *wline;
2818 	struct tog_color *tc;
2819 	static const size_t date_display_cols = 12;
2820 	struct got_reflist_head *refs;
2821 
2822 	if (view_is_hsplit_top(view))
2823 		--limit;  /* account for border */
2824 
2825 	if (s->selected_entry &&
2826 	    !(view->searching && view->search_next_done == 0)) {
2827 		err = got_object_id_str(&id_str, s->selected_entry->id);
2828 		if (err)
2829 			return err;
2830 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2831 		    s->selected_entry->id);
2832 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2833 		    s->repo);
2834 		if (err)
2835 			goto done;
2836 	}
2837 
2838 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2839 		halfdelay(10); /* disable fast refresh */
2840 
2841 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2842 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2843 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2844 		    (view->searching && !view->search_next_done) ?
2845 		    "searching..." : "loading...") == -1) {
2846 			err = got_error_from_errno("asprintf");
2847 			goto done;
2848 		}
2849 	} else {
2850 		const char *search_str = NULL;
2851 		const char *limit_str = NULL;
2852 
2853 		if (view->searching) {
2854 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2855 				search_str = "no more matches";
2856 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2857 				search_str = "no matches found";
2858 			else if (!view->search_next_done)
2859 				search_str = "searching...";
2860 		}
2861 
2862 		if (s->limit_view && s->commits->ncommits == 0)
2863 			limit_str = "no matches found";
2864 
2865 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2866 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2867 		    search_str ? search_str : (refs_str ? refs_str : ""),
2868 		    limit_str ? limit_str : "") == -1) {
2869 			err = got_error_from_errno("asprintf");
2870 			goto done;
2871 		}
2872 	}
2873 
2874 	free(refs_str);
2875 	refs_str = NULL;
2876 
2877 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2878 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2879 		    "........................................",
2880 		    s->in_repo_path, ncommits_str) == -1) {
2881 			err = got_error_from_errno("asprintf");
2882 			header = NULL;
2883 			goto done;
2884 		}
2885 	} else if (asprintf(&header, "commit %s%s",
2886 	    id_str ? id_str : "........................................",
2887 	    ncommits_str) == -1) {
2888 		err = got_error_from_errno("asprintf");
2889 		header = NULL;
2890 		goto done;
2891 	}
2892 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2893 	if (err)
2894 		goto done;
2895 
2896 	werase(view->window);
2897 
2898 	if (view_needs_focus_indication(view))
2899 		wstandout(view->window);
2900 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2901 	if (tc)
2902 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2903 	waddwstr(view->window, wline);
2904 	while (width < view->ncols) {
2905 		waddch(view->window, ' ');
2906 		width++;
2907 	}
2908 	if (tc)
2909 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2910 	if (view_needs_focus_indication(view))
2911 		wstandend(view->window);
2912 	free(wline);
2913 	if (limit <= 1)
2914 		goto done;
2915 
2916 	/* Grow author column size if necessary, and set view->maxx. */
2917 	entry = s->first_displayed_entry;
2918 	ncommits = 0;
2919 	view->maxx = 0;
2920 	while (entry) {
2921 		struct got_commit_object *c = entry->commit;
2922 		char *author, *eol, *msg, *msg0;
2923 		wchar_t *wauthor, *wmsg;
2924 		int width;
2925 		if (ncommits >= limit - 1)
2926 			break;
2927 		if (s->use_committer)
2928 			author = strdup(got_object_commit_get_committer(c));
2929 		else
2930 			author = strdup(got_object_commit_get_author(c));
2931 		if (author == NULL) {
2932 			err = got_error_from_errno("strdup");
2933 			goto done;
2934 		}
2935 		err = format_author(&wauthor, &width, author, COLS,
2936 		    date_display_cols);
2937 		if (author_cols < width)
2938 			author_cols = width;
2939 		free(wauthor);
2940 		free(author);
2941 		if (err)
2942 			goto done;
2943 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2944 		    entry->id);
2945 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2946 		if (err)
2947 			goto done;
2948 		if (refs_str) {
2949 			wchar_t *ws;
2950 			err = format_line(&ws, &width, NULL, refs_str,
2951 			    0, INT_MAX, date_display_cols + author_cols, 0);
2952 			free(ws);
2953 			free(refs_str);
2954 			refs_str = NULL;
2955 			if (err)
2956 				goto done;
2957 			refstr_cols = width + 3; /* account for [ ] + space */
2958 		} else
2959 			refstr_cols = 0;
2960 		err = got_object_commit_get_logmsg(&msg0, c);
2961 		if (err)
2962 			goto done;
2963 		msg = msg0;
2964 		while (*msg == '\n')
2965 			++msg;
2966 		if ((eol = strchr(msg, '\n')))
2967 			*eol = '\0';
2968 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2969 		    date_display_cols + author_cols + refstr_cols, 0);
2970 		if (err)
2971 			goto done;
2972 		view->maxx = MAX(view->maxx, width + refstr_cols);
2973 		free(msg0);
2974 		free(wmsg);
2975 		ncommits++;
2976 		entry = TAILQ_NEXT(entry, entry);
2977 	}
2978 
2979 	entry = s->first_displayed_entry;
2980 	s->last_displayed_entry = s->first_displayed_entry;
2981 	ncommits = 0;
2982 	while (entry) {
2983 		if (ncommits >= limit - 1)
2984 			break;
2985 		if (ncommits == s->selected)
2986 			wstandout(view->window);
2987 		err = draw_commit(view, entry, date_display_cols, author_cols);
2988 		if (ncommits == s->selected)
2989 			wstandend(view->window);
2990 		if (err)
2991 			goto done;
2992 		ncommits++;
2993 		s->last_displayed_entry = entry;
2994 		entry = TAILQ_NEXT(entry, entry);
2995 	}
2996 
2997 	view_border(view);
2998 done:
2999 	free(id_str);
3000 	free(refs_str);
3001 	free(ncommits_str);
3002 	free(header);
3003 	return err;
3004 }
3005 
3006 static void
3007 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3008 {
3009 	struct commit_queue_entry *entry;
3010 	int nscrolled = 0;
3011 
3012 	entry = TAILQ_FIRST(&s->commits->head);
3013 	if (s->first_displayed_entry == entry)
3014 		return;
3015 
3016 	entry = s->first_displayed_entry;
3017 	while (entry && nscrolled < maxscroll) {
3018 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3019 		if (entry) {
3020 			s->first_displayed_entry = entry;
3021 			nscrolled++;
3022 		}
3023 	}
3024 }
3025 
3026 static const struct got_error *
3027 trigger_log_thread(struct tog_view *view, int wait)
3028 {
3029 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3030 	int errcode;
3031 
3032 	if (!using_mock_io)
3033 		halfdelay(1); /* fast refresh while loading commits */
3034 
3035 	while (!ta->log_complete && !tog_thread_error &&
3036 	    (ta->commits_needed > 0 || ta->load_all)) {
3037 		/* Wake the log thread. */
3038 		errcode = pthread_cond_signal(&ta->need_commits);
3039 		if (errcode)
3040 			return got_error_set_errno(errcode,
3041 			    "pthread_cond_signal");
3042 
3043 		/*
3044 		 * The mutex will be released while the view loop waits
3045 		 * in wgetch(), at which time the log thread will run.
3046 		 */
3047 		if (!wait)
3048 			break;
3049 
3050 		/* Display progress update in log view. */
3051 		show_log_view(view);
3052 		update_panels();
3053 		doupdate();
3054 
3055 		/* Wait right here while next commit is being loaded. */
3056 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3057 		if (errcode)
3058 			return got_error_set_errno(errcode,
3059 			    "pthread_cond_wait");
3060 
3061 		/* Display progress update in log view. */
3062 		show_log_view(view);
3063 		update_panels();
3064 		doupdate();
3065 	}
3066 
3067 	return NULL;
3068 }
3069 
3070 static const struct got_error *
3071 request_log_commits(struct tog_view *view)
3072 {
3073 	struct tog_log_view_state	*state = &view->state.log;
3074 	const struct got_error		*err = NULL;
3075 
3076 	if (state->thread_args.log_complete)
3077 		return NULL;
3078 
3079 	state->thread_args.commits_needed += view->nscrolled;
3080 	err = trigger_log_thread(view, 1);
3081 	view->nscrolled = 0;
3082 
3083 	return err;
3084 }
3085 
3086 static const struct got_error *
3087 log_scroll_down(struct tog_view *view, int maxscroll)
3088 {
3089 	struct tog_log_view_state *s = &view->state.log;
3090 	const struct got_error *err = NULL;
3091 	struct commit_queue_entry *pentry;
3092 	int nscrolled = 0, ncommits_needed;
3093 
3094 	if (s->last_displayed_entry == NULL)
3095 		return NULL;
3096 
3097 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3098 	if (s->commits->ncommits < ncommits_needed &&
3099 	    !s->thread_args.log_complete) {
3100 		/*
3101 		 * Ask the log thread for required amount of commits.
3102 		 */
3103 		s->thread_args.commits_needed +=
3104 		    ncommits_needed - s->commits->ncommits;
3105 		err = trigger_log_thread(view, 1);
3106 		if (err)
3107 			return err;
3108 	}
3109 
3110 	do {
3111 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3112 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3113 			break;
3114 
3115 		s->last_displayed_entry = pentry ?
3116 		    pentry : s->last_displayed_entry;
3117 
3118 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3119 		if (pentry == NULL)
3120 			break;
3121 		s->first_displayed_entry = pentry;
3122 	} while (++nscrolled < maxscroll);
3123 
3124 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3125 		view->nscrolled += nscrolled;
3126 	else
3127 		view->nscrolled = 0;
3128 
3129 	return err;
3130 }
3131 
3132 static const struct got_error *
3133 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3134     struct got_commit_object *commit, struct got_object_id *commit_id,
3135     struct tog_view *log_view, struct got_repository *repo)
3136 {
3137 	const struct got_error *err;
3138 	struct got_object_qid *parent_id;
3139 	struct tog_view *diff_view;
3140 
3141 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3142 	if (diff_view == NULL)
3143 		return got_error_from_errno("view_open");
3144 
3145 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3146 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3147 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3148 	if (err == NULL)
3149 		*new_view = diff_view;
3150 	return err;
3151 }
3152 
3153 static const struct got_error *
3154 tree_view_visit_subtree(struct tog_tree_view_state *s,
3155     struct got_tree_object *subtree)
3156 {
3157 	struct tog_parent_tree *parent;
3158 
3159 	parent = calloc(1, sizeof(*parent));
3160 	if (parent == NULL)
3161 		return got_error_from_errno("calloc");
3162 
3163 	parent->tree = s->tree;
3164 	parent->first_displayed_entry = s->first_displayed_entry;
3165 	parent->selected_entry = s->selected_entry;
3166 	parent->selected = s->selected;
3167 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3168 	s->tree = subtree;
3169 	s->selected = 0;
3170 	s->first_displayed_entry = NULL;
3171 	return NULL;
3172 }
3173 
3174 static const struct got_error *
3175 tree_view_walk_path(struct tog_tree_view_state *s,
3176     struct got_commit_object *commit, const char *path)
3177 {
3178 	const struct got_error *err = NULL;
3179 	struct got_tree_object *tree = NULL;
3180 	const char *p;
3181 	char *slash, *subpath = NULL;
3182 
3183 	/* Walk the path and open corresponding tree objects. */
3184 	p = path;
3185 	while (*p) {
3186 		struct got_tree_entry *te;
3187 		struct got_object_id *tree_id;
3188 		char *te_name;
3189 
3190 		while (p[0] == '/')
3191 			p++;
3192 
3193 		/* Ensure the correct subtree entry is selected. */
3194 		slash = strchr(p, '/');
3195 		if (slash == NULL)
3196 			te_name = strdup(p);
3197 		else
3198 			te_name = strndup(p, slash - p);
3199 		if (te_name == NULL) {
3200 			err = got_error_from_errno("strndup");
3201 			break;
3202 		}
3203 		te = got_object_tree_find_entry(s->tree, te_name);
3204 		if (te == NULL) {
3205 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3206 			free(te_name);
3207 			break;
3208 		}
3209 		free(te_name);
3210 		s->first_displayed_entry = s->selected_entry = te;
3211 
3212 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3213 			break; /* jump to this file's entry */
3214 
3215 		slash = strchr(p, '/');
3216 		if (slash)
3217 			subpath = strndup(path, slash - path);
3218 		else
3219 			subpath = strdup(path);
3220 		if (subpath == NULL) {
3221 			err = got_error_from_errno("strdup");
3222 			break;
3223 		}
3224 
3225 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3226 		    subpath);
3227 		if (err)
3228 			break;
3229 
3230 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3231 		free(tree_id);
3232 		if (err)
3233 			break;
3234 
3235 		err = tree_view_visit_subtree(s, tree);
3236 		if (err) {
3237 			got_object_tree_close(tree);
3238 			break;
3239 		}
3240 		if (slash == NULL)
3241 			break;
3242 		free(subpath);
3243 		subpath = NULL;
3244 		p = slash;
3245 	}
3246 
3247 	free(subpath);
3248 	return err;
3249 }
3250 
3251 static const struct got_error *
3252 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3253     struct commit_queue_entry *entry, const char *path,
3254     const char *head_ref_name, struct got_repository *repo)
3255 {
3256 	const struct got_error *err = NULL;
3257 	struct tog_tree_view_state *s;
3258 	struct tog_view *tree_view;
3259 
3260 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3261 	if (tree_view == NULL)
3262 		return got_error_from_errno("view_open");
3263 
3264 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3265 	if (err)
3266 		return err;
3267 	s = &tree_view->state.tree;
3268 
3269 	*new_view = tree_view;
3270 
3271 	if (got_path_is_root_dir(path))
3272 		return NULL;
3273 
3274 	return tree_view_walk_path(s, entry->commit, path);
3275 }
3276 
3277 static const struct got_error *
3278 block_signals_used_by_main_thread(void)
3279 {
3280 	sigset_t sigset;
3281 	int errcode;
3282 
3283 	if (sigemptyset(&sigset) == -1)
3284 		return got_error_from_errno("sigemptyset");
3285 
3286 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3287 	if (sigaddset(&sigset, SIGWINCH) == -1)
3288 		return got_error_from_errno("sigaddset");
3289 	if (sigaddset(&sigset, SIGCONT) == -1)
3290 		return got_error_from_errno("sigaddset");
3291 	if (sigaddset(&sigset, SIGINT) == -1)
3292 		return got_error_from_errno("sigaddset");
3293 	if (sigaddset(&sigset, SIGTERM) == -1)
3294 		return got_error_from_errno("sigaddset");
3295 
3296 	/* ncurses handles SIGTSTP */
3297 	if (sigaddset(&sigset, SIGTSTP) == -1)
3298 		return got_error_from_errno("sigaddset");
3299 
3300 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3301 	if (errcode)
3302 		return got_error_set_errno(errcode, "pthread_sigmask");
3303 
3304 	return NULL;
3305 }
3306 
3307 static void *
3308 log_thread(void *arg)
3309 {
3310 	const struct got_error *err = NULL;
3311 	int errcode = 0;
3312 	struct tog_log_thread_args *a = arg;
3313 	int done = 0;
3314 
3315 	/*
3316 	 * Sync startup with main thread such that we begin our
3317 	 * work once view_input() has released the mutex.
3318 	 */
3319 	errcode = pthread_mutex_lock(&tog_mutex);
3320 	if (errcode) {
3321 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3322 		return (void *)err;
3323 	}
3324 
3325 	err = block_signals_used_by_main_thread();
3326 	if (err) {
3327 		pthread_mutex_unlock(&tog_mutex);
3328 		goto done;
3329 	}
3330 
3331 	while (!done && !err && !tog_fatal_signal_received()) {
3332 		errcode = pthread_mutex_unlock(&tog_mutex);
3333 		if (errcode) {
3334 			err = got_error_set_errno(errcode,
3335 			    "pthread_mutex_unlock");
3336 			goto done;
3337 		}
3338 		err = queue_commits(a);
3339 		if (err) {
3340 			if (err->code != GOT_ERR_ITER_COMPLETED)
3341 				goto done;
3342 			err = NULL;
3343 			done = 1;
3344 			a->commits_needed = 0;
3345 		} else if (a->commits_needed > 0 && !a->load_all) {
3346 			if (*a->limiting) {
3347 				if (a->limit_match)
3348 					a->commits_needed--;
3349 			} else
3350 				a->commits_needed--;
3351 		}
3352 
3353 		errcode = pthread_mutex_lock(&tog_mutex);
3354 		if (errcode) {
3355 			err = got_error_set_errno(errcode,
3356 			    "pthread_mutex_lock");
3357 			goto done;
3358 		} else if (*a->quit)
3359 			done = 1;
3360 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3361 			*a->first_displayed_entry =
3362 			    TAILQ_FIRST(&a->limit_commits->head);
3363 			*a->selected_entry = *a->first_displayed_entry;
3364 		} else if (*a->first_displayed_entry == NULL) {
3365 			*a->first_displayed_entry =
3366 			    TAILQ_FIRST(&a->real_commits->head);
3367 			*a->selected_entry = *a->first_displayed_entry;
3368 		}
3369 
3370 		errcode = pthread_cond_signal(&a->commit_loaded);
3371 		if (errcode) {
3372 			err = got_error_set_errno(errcode,
3373 			    "pthread_cond_signal");
3374 			pthread_mutex_unlock(&tog_mutex);
3375 			goto done;
3376 		}
3377 
3378 		if (a->commits_needed == 0 &&
3379 		    a->need_commit_marker && a->worktree) {
3380 			errcode = pthread_mutex_unlock(&tog_mutex);
3381 			if (errcode) {
3382 				err = got_error_set_errno(errcode,
3383 				    "pthread_mutex_unlock");
3384 				goto done;
3385 			}
3386 			err = got_worktree_get_state(&tog_base_commit.marker,
3387 			    a->repo, a->worktree, NULL, NULL);
3388 			if (err)
3389 				goto done;
3390 			errcode = pthread_mutex_lock(&tog_mutex);
3391 			if (errcode) {
3392 				err = got_error_set_errno(errcode,
3393 				    "pthread_mutex_lock");
3394 				goto done;
3395 			}
3396 			a->need_commit_marker = 0;
3397 			/*
3398 			 * The main thread did not close this
3399 			 * work tree yet. Close it now.
3400 			 */
3401 			got_worktree_close(a->worktree);
3402 			a->worktree = NULL;
3403 
3404 			if (*a->quit)
3405 				done = 1;
3406 		}
3407 
3408 		if (done)
3409 			a->commits_needed = 0;
3410 		else {
3411 			if (a->commits_needed == 0 && !a->load_all) {
3412 				if (tog_io.wait_for_ui) {
3413 					errcode = pthread_cond_signal(
3414 					    &a->log_loaded);
3415 					if (errcode && err == NULL)
3416 						err = got_error_set_errno(
3417 						    errcode,
3418 						    "pthread_cond_signal");
3419 				}
3420 
3421 				errcode = pthread_cond_wait(&a->need_commits,
3422 				    &tog_mutex);
3423 				if (errcode) {
3424 					err = got_error_set_errno(errcode,
3425 					    "pthread_cond_wait");
3426 					pthread_mutex_unlock(&tog_mutex);
3427 					goto done;
3428 				}
3429 				if (*a->quit)
3430 					done = 1;
3431 			}
3432 		}
3433 	}
3434 	a->log_complete = 1;
3435 	if (tog_io.wait_for_ui) {
3436 		errcode = pthread_cond_signal(&a->log_loaded);
3437 		if (errcode && err == NULL)
3438 			err = got_error_set_errno(errcode,
3439 			    "pthread_cond_signal");
3440 	}
3441 
3442 	errcode = pthread_mutex_unlock(&tog_mutex);
3443 	if (errcode)
3444 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3445 done:
3446 	if (err) {
3447 		tog_thread_error = 1;
3448 		pthread_cond_signal(&a->commit_loaded);
3449 		if (a->worktree) {
3450 			got_worktree_close(a->worktree);
3451 			a->worktree = NULL;
3452 		}
3453 	}
3454 	return (void *)err;
3455 }
3456 
3457 static const struct got_error *
3458 stop_log_thread(struct tog_log_view_state *s)
3459 {
3460 	const struct got_error *err = NULL, *thread_err = NULL;
3461 	int errcode;
3462 
3463 	if (s->thread) {
3464 		s->quit = 1;
3465 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3466 		if (errcode)
3467 			return got_error_set_errno(errcode,
3468 			    "pthread_cond_signal");
3469 		errcode = pthread_mutex_unlock(&tog_mutex);
3470 		if (errcode)
3471 			return got_error_set_errno(errcode,
3472 			    "pthread_mutex_unlock");
3473 		errcode = pthread_join(s->thread, (void **)&thread_err);
3474 		if (errcode)
3475 			return got_error_set_errno(errcode, "pthread_join");
3476 		errcode = pthread_mutex_lock(&tog_mutex);
3477 		if (errcode)
3478 			return got_error_set_errno(errcode,
3479 			    "pthread_mutex_lock");
3480 		s->thread = 0; //NULL;
3481 	}
3482 
3483 	if (s->thread_args.repo) {
3484 		err = got_repo_close(s->thread_args.repo);
3485 		s->thread_args.repo = NULL;
3486 	}
3487 
3488 	if (s->thread_args.pack_fds) {
3489 		const struct got_error *pack_err =
3490 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3491 		if (err == NULL)
3492 			err = pack_err;
3493 		s->thread_args.pack_fds = NULL;
3494 	}
3495 
3496 	if (s->thread_args.graph) {
3497 		got_commit_graph_close(s->thread_args.graph);
3498 		s->thread_args.graph = NULL;
3499 	}
3500 
3501 	return err ? err : thread_err;
3502 }
3503 
3504 static const struct got_error *
3505 close_log_view(struct tog_view *view)
3506 {
3507 	const struct got_error *err = NULL;
3508 	struct tog_log_view_state *s = &view->state.log;
3509 	int errcode;
3510 
3511 	err = stop_log_thread(s);
3512 
3513 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3514 	if (errcode && err == NULL)
3515 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3516 
3517 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3518 	if (errcode && err == NULL)
3519 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3520 
3521 	free_commits(&s->limit_commits);
3522 	free_commits(&s->real_commits);
3523 	free(s->in_repo_path);
3524 	s->in_repo_path = NULL;
3525 	free(s->start_id);
3526 	s->start_id = NULL;
3527 	free(s->head_ref_name);
3528 	s->head_ref_name = NULL;
3529 	return err;
3530 }
3531 
3532 /*
3533  * We use two queues to implement the limit feature: first consists of
3534  * commits matching the current limit_regex; second is the real queue
3535  * of all known commits (real_commits). When the user starts limiting,
3536  * we swap queues such that all movement and displaying functionality
3537  * works with very slight change.
3538  */
3539 static const struct got_error *
3540 limit_log_view(struct tog_view *view)
3541 {
3542 	struct tog_log_view_state *s = &view->state.log;
3543 	struct commit_queue_entry *entry;
3544 	struct tog_view	*v = view;
3545 	const struct got_error *err = NULL;
3546 	char pattern[1024];
3547 	int ret;
3548 
3549 	if (view_is_hsplit_top(view))
3550 		v = view->child;
3551 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3552 		v = view->parent;
3553 
3554 	/* Get the pattern */
3555 	wmove(v->window, v->nlines - 1, 0);
3556 	wclrtoeol(v->window);
3557 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3558 	nodelay(v->window, FALSE);
3559 	nocbreak();
3560 	echo();
3561 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3562 	cbreak();
3563 	noecho();
3564 	nodelay(v->window, TRUE);
3565 	if (ret == ERR)
3566 		return NULL;
3567 
3568 	if (*pattern == '\0') {
3569 		/*
3570 		 * Safety measure for the situation where the user
3571 		 * resets limit without previously limiting anything.
3572 		 */
3573 		if (!s->limit_view)
3574 			return NULL;
3575 
3576 		/*
3577 		 * User could have pressed Ctrl+L, which refreshed the
3578 		 * commit queues, it means we can't save previously
3579 		 * (before limit took place) displayed entries,
3580 		 * because they would point to already free'ed memory,
3581 		 * so we are forced to always select first entry of
3582 		 * the queue.
3583 		 */
3584 		s->commits = &s->real_commits;
3585 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3586 		s->selected_entry = s->first_displayed_entry;
3587 		s->selected = 0;
3588 		s->limit_view = 0;
3589 
3590 		return NULL;
3591 	}
3592 
3593 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3594 		return NULL;
3595 
3596 	s->limit_view = 1;
3597 
3598 	/* Clear the screen while loading limit view */
3599 	s->first_displayed_entry = NULL;
3600 	s->last_displayed_entry = NULL;
3601 	s->selected_entry = NULL;
3602 	s->commits = &s->limit_commits;
3603 
3604 	/* Prepare limit queue for new search */
3605 	free_commits(&s->limit_commits);
3606 	s->limit_commits.ncommits = 0;
3607 
3608 	/* First process commits, which are in queue already */
3609 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3610 		int have_match = 0;
3611 
3612 		err = match_commit(&have_match, entry->id,
3613 		    entry->commit, &s->limit_regex);
3614 		if (err)
3615 			return err;
3616 
3617 		if (have_match) {
3618 			struct commit_queue_entry *matched;
3619 
3620 			matched = alloc_commit_queue_entry(entry->commit,
3621 			    entry->id);
3622 			if (matched == NULL) {
3623 				err = got_error_from_errno(
3624 				    "alloc_commit_queue_entry");
3625 				break;
3626 			}
3627 			matched->commit = entry->commit;
3628 			got_object_commit_retain(entry->commit);
3629 
3630 			matched->idx = s->limit_commits.ncommits;
3631 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3632 			    matched, entry);
3633 			s->limit_commits.ncommits++;
3634 		}
3635 	}
3636 
3637 	/* Second process all the commits, until we fill the screen */
3638 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3639 	    !s->thread_args.log_complete) {
3640 		s->thread_args.commits_needed +=
3641 		    view->nlines - s->limit_commits.ncommits - 1;
3642 		err = trigger_log_thread(view, 1);
3643 		if (err)
3644 			return err;
3645 	}
3646 
3647 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3648 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3649 	s->selected = 0;
3650 
3651 	return NULL;
3652 }
3653 
3654 static const struct got_error *
3655 search_start_log_view(struct tog_view *view)
3656 {
3657 	struct tog_log_view_state *s = &view->state.log;
3658 
3659 	s->matched_entry = NULL;
3660 	s->search_entry = NULL;
3661 	return NULL;
3662 }
3663 
3664 static const struct got_error *
3665 search_next_log_view(struct tog_view *view)
3666 {
3667 	const struct got_error *err = NULL;
3668 	struct tog_log_view_state *s = &view->state.log;
3669 	struct commit_queue_entry *entry;
3670 
3671 	/* Display progress update in log view. */
3672 	show_log_view(view);
3673 	update_panels();
3674 	doupdate();
3675 
3676 	if (s->search_entry) {
3677 		int errcode, ch;
3678 		errcode = pthread_mutex_unlock(&tog_mutex);
3679 		if (errcode)
3680 			return got_error_set_errno(errcode,
3681 			    "pthread_mutex_unlock");
3682 		ch = wgetch(view->window);
3683 		errcode = pthread_mutex_lock(&tog_mutex);
3684 		if (errcode)
3685 			return got_error_set_errno(errcode,
3686 			    "pthread_mutex_lock");
3687 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3688 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3689 			return NULL;
3690 		}
3691 		if (view->searching == TOG_SEARCH_FORWARD)
3692 			entry = TAILQ_NEXT(s->search_entry, entry);
3693 		else
3694 			entry = TAILQ_PREV(s->search_entry,
3695 			    commit_queue_head, entry);
3696 	} else if (s->matched_entry) {
3697 		/*
3698 		 * If the user has moved the cursor after we hit a match,
3699 		 * the position from where we should continue searching
3700 		 * might have changed.
3701 		 */
3702 		if (view->searching == TOG_SEARCH_FORWARD)
3703 			entry = TAILQ_NEXT(s->selected_entry, entry);
3704 		else
3705 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3706 			    entry);
3707 	} else {
3708 		entry = s->selected_entry;
3709 	}
3710 
3711 	while (1) {
3712 		int have_match = 0;
3713 
3714 		if (entry == NULL) {
3715 			if (s->thread_args.log_complete ||
3716 			    view->searching == TOG_SEARCH_BACKWARD) {
3717 				view->search_next_done =
3718 				    (s->matched_entry == NULL ?
3719 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3720 				s->search_entry = NULL;
3721 				return NULL;
3722 			}
3723 			/*
3724 			 * Poke the log thread for more commits and return,
3725 			 * allowing the main loop to make progress. Search
3726 			 * will resume at s->search_entry once we come back.
3727 			 */
3728 			s->thread_args.commits_needed++;
3729 			return trigger_log_thread(view, 0);
3730 		}
3731 
3732 		err = match_commit(&have_match, entry->id, entry->commit,
3733 		    &view->regex);
3734 		if (err)
3735 			break;
3736 		if (have_match) {
3737 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3738 			s->matched_entry = entry;
3739 			break;
3740 		}
3741 
3742 		s->search_entry = entry;
3743 		if (view->searching == TOG_SEARCH_FORWARD)
3744 			entry = TAILQ_NEXT(entry, entry);
3745 		else
3746 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3747 	}
3748 
3749 	if (s->matched_entry) {
3750 		int cur = s->selected_entry->idx;
3751 		while (cur < s->matched_entry->idx) {
3752 			err = input_log_view(NULL, view, KEY_DOWN);
3753 			if (err)
3754 				return err;
3755 			cur++;
3756 		}
3757 		while (cur > s->matched_entry->idx) {
3758 			err = input_log_view(NULL, view, KEY_UP);
3759 			if (err)
3760 				return err;
3761 			cur--;
3762 		}
3763 	}
3764 
3765 	s->search_entry = NULL;
3766 
3767 	return NULL;
3768 }
3769 
3770 static const struct got_error *
3771 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3772     struct got_repository *repo, const char *head_ref_name,
3773     const char *in_repo_path, int log_branches,
3774     struct got_worktree *worktree)
3775 {
3776 	const struct got_error *err = NULL;
3777 	struct tog_log_view_state *s = &view->state.log;
3778 	struct got_repository *thread_repo = NULL;
3779 	struct got_commit_graph *thread_graph = NULL;
3780 	int errcode;
3781 
3782 	if (in_repo_path != s->in_repo_path) {
3783 		free(s->in_repo_path);
3784 		s->in_repo_path = strdup(in_repo_path);
3785 		if (s->in_repo_path == NULL) {
3786 			err = got_error_from_errno("strdup");
3787 			goto done;
3788 		}
3789 	}
3790 
3791 	/* The commit queue only contains commits being displayed. */
3792 	TAILQ_INIT(&s->real_commits.head);
3793 	s->real_commits.ncommits = 0;
3794 	s->commits = &s->real_commits;
3795 
3796 	TAILQ_INIT(&s->limit_commits.head);
3797 	s->limit_view = 0;
3798 	s->limit_commits.ncommits = 0;
3799 
3800 	s->repo = repo;
3801 	if (head_ref_name) {
3802 		s->head_ref_name = strdup(head_ref_name);
3803 		if (s->head_ref_name == NULL) {
3804 			err = got_error_from_errno("strdup");
3805 			goto done;
3806 		}
3807 	}
3808 	s->start_id = got_object_id_dup(start_id);
3809 	if (s->start_id == NULL) {
3810 		err = got_error_from_errno("got_object_id_dup");
3811 		goto done;
3812 	}
3813 	s->log_branches = log_branches;
3814 	s->use_committer = 1;
3815 
3816 	STAILQ_INIT(&s->colors);
3817 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3818 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3819 		    get_color_value("TOG_COLOR_COMMIT"));
3820 		if (err)
3821 			goto done;
3822 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3823 		    get_color_value("TOG_COLOR_AUTHOR"));
3824 		if (err) {
3825 			free_colors(&s->colors);
3826 			goto done;
3827 		}
3828 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3829 		    get_color_value("TOG_COLOR_DATE"));
3830 		if (err) {
3831 			free_colors(&s->colors);
3832 			goto done;
3833 		}
3834 	}
3835 
3836 	view->show = show_log_view;
3837 	view->input = input_log_view;
3838 	view->resize = resize_log_view;
3839 	view->close = close_log_view;
3840 	view->search_start = search_start_log_view;
3841 	view->search_next = search_next_log_view;
3842 
3843 	if (s->thread_args.pack_fds == NULL) {
3844 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3845 		if (err)
3846 			goto done;
3847 	}
3848 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3849 	    s->thread_args.pack_fds);
3850 	if (err)
3851 		goto done;
3852 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3853 	    !s->log_branches);
3854 	if (err)
3855 		goto done;
3856 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3857 	    s->repo, NULL, NULL);
3858 	if (err)
3859 		goto done;
3860 
3861 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3862 	if (errcode) {
3863 		err = got_error_set_errno(errcode, "pthread_cond_init");
3864 		goto done;
3865 	}
3866 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3867 	if (errcode) {
3868 		err = got_error_set_errno(errcode, "pthread_cond_init");
3869 		goto done;
3870 	}
3871 
3872 	if (using_mock_io) {
3873 		int rc;
3874 
3875 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3876 		if (rc)
3877 			return got_error_set_errno(rc, "pthread_cond_init");
3878 	}
3879 
3880 	s->thread_args.commits_needed = view->nlines;
3881 	s->thread_args.graph = thread_graph;
3882 	s->thread_args.real_commits = &s->real_commits;
3883 	s->thread_args.limit_commits = &s->limit_commits;
3884 	s->thread_args.in_repo_path = s->in_repo_path;
3885 	s->thread_args.start_id = s->start_id;
3886 	s->thread_args.repo = thread_repo;
3887 	s->thread_args.log_complete = 0;
3888 	s->thread_args.quit = &s->quit;
3889 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3890 	s->thread_args.selected_entry = &s->selected_entry;
3891 	s->thread_args.searching = &view->searching;
3892 	s->thread_args.search_next_done = &view->search_next_done;
3893 	s->thread_args.regex = &view->regex;
3894 	s->thread_args.limiting = &s->limit_view;
3895 	s->thread_args.limit_regex = &s->limit_regex;
3896 	s->thread_args.limit_commits = &s->limit_commits;
3897 	s->thread_args.worktree = worktree;
3898 	if (worktree)
3899 		s->thread_args.need_commit_marker = 1;
3900 done:
3901 	if (err) {
3902 		if (view->close == NULL)
3903 			close_log_view(view);
3904 		view_close(view);
3905 	}
3906 	return err;
3907 }
3908 
3909 static const struct got_error *
3910 show_log_view(struct tog_view *view)
3911 {
3912 	const struct got_error *err;
3913 	struct tog_log_view_state *s = &view->state.log;
3914 
3915 	if (s->thread == 0) { //NULL) {
3916 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3917 		    &s->thread_args);
3918 		if (errcode)
3919 			return got_error_set_errno(errcode, "pthread_create");
3920 		if (s->thread_args.commits_needed > 0) {
3921 			err = trigger_log_thread(view, 1);
3922 			if (err)
3923 				return err;
3924 		}
3925 	}
3926 
3927 	return draw_commits(view);
3928 }
3929 
3930 static void
3931 log_move_cursor_up(struct tog_view *view, int page, int home)
3932 {
3933 	struct tog_log_view_state *s = &view->state.log;
3934 
3935 	if (s->first_displayed_entry == NULL)
3936 		return;
3937 	if (s->selected_entry->idx == 0)
3938 		view->count = 0;
3939 
3940 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3941 	    || home)
3942 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3943 
3944 	if (!page && !home && s->selected > 0)
3945 		--s->selected;
3946 	else
3947 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3948 
3949 	select_commit(s);
3950 	return;
3951 }
3952 
3953 static const struct got_error *
3954 log_move_cursor_down(struct tog_view *view, int page)
3955 {
3956 	struct tog_log_view_state	*s = &view->state.log;
3957 	const struct got_error		*err = NULL;
3958 	int				 eos = view->nlines - 2;
3959 
3960 	if (s->first_displayed_entry == NULL)
3961 		return NULL;
3962 
3963 	if (s->thread_args.log_complete &&
3964 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3965 		return NULL;
3966 
3967 	if (view_is_hsplit_top(view))
3968 		--eos;  /* border consumes the last line */
3969 
3970 	if (!page) {
3971 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3972 			++s->selected;
3973 		else
3974 			err = log_scroll_down(view, 1);
3975 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3976 		struct commit_queue_entry *entry;
3977 		int n;
3978 
3979 		s->selected = 0;
3980 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3981 		s->last_displayed_entry = entry;
3982 		for (n = 0; n <= eos; n++) {
3983 			if (entry == NULL)
3984 				break;
3985 			s->first_displayed_entry = entry;
3986 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3987 		}
3988 		if (n > 0)
3989 			s->selected = n - 1;
3990 	} else {
3991 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3992 		    s->thread_args.log_complete)
3993 			s->selected += MIN(page,
3994 			    s->commits->ncommits - s->selected_entry->idx - 1);
3995 		else
3996 			err = log_scroll_down(view, page);
3997 	}
3998 	if (err)
3999 		return err;
4000 
4001 	/*
4002 	 * We might necessarily overshoot in horizontal
4003 	 * splits; if so, select the last displayed commit.
4004 	 */
4005 	if (s->first_displayed_entry && s->last_displayed_entry) {
4006 		s->selected = MIN(s->selected,
4007 		    s->last_displayed_entry->idx -
4008 		    s->first_displayed_entry->idx);
4009 	}
4010 
4011 	select_commit(s);
4012 
4013 	if (s->thread_args.log_complete &&
4014 	    s->selected_entry->idx == s->commits->ncommits - 1)
4015 		view->count = 0;
4016 
4017 	return NULL;
4018 }
4019 
4020 static void
4021 view_get_split(struct tog_view *view, int *y, int *x)
4022 {
4023 	*x = 0;
4024 	*y = 0;
4025 
4026 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4027 		if (view->child && view->child->resized_y)
4028 			*y = view->child->resized_y;
4029 		else if (view->resized_y)
4030 			*y = view->resized_y;
4031 		else
4032 			*y = view_split_begin_y(view->lines);
4033 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4034 		if (view->child && view->child->resized_x)
4035 			*x = view->child->resized_x;
4036 		else if (view->resized_x)
4037 			*x = view->resized_x;
4038 		else
4039 			*x = view_split_begin_x(view->begin_x);
4040 	}
4041 }
4042 
4043 /* Split view horizontally at y and offset view->state->selected line. */
4044 static const struct got_error *
4045 view_init_hsplit(struct tog_view *view, int y)
4046 {
4047 	const struct got_error *err = NULL;
4048 
4049 	view->nlines = y;
4050 	view->ncols = COLS;
4051 	err = view_resize(view);
4052 	if (err)
4053 		return err;
4054 
4055 	err = offset_selection_down(view);
4056 
4057 	return err;
4058 }
4059 
4060 static const struct got_error *
4061 log_goto_line(struct tog_view *view, int nlines)
4062 {
4063 	const struct got_error		*err = NULL;
4064 	struct tog_log_view_state	*s = &view->state.log;
4065 	int				 g, idx = s->selected_entry->idx;
4066 
4067 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4068 		return NULL;
4069 
4070 	g = view->gline;
4071 	view->gline = 0;
4072 
4073 	if (g >= s->first_displayed_entry->idx + 1 &&
4074 	    g <= s->last_displayed_entry->idx + 1 &&
4075 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4076 		s->selected = g - s->first_displayed_entry->idx - 1;
4077 		select_commit(s);
4078 		return NULL;
4079 	}
4080 
4081 	if (idx + 1 < g) {
4082 		err = log_move_cursor_down(view, g - idx - 1);
4083 		if (!err && g > s->selected_entry->idx + 1)
4084 			err = log_move_cursor_down(view,
4085 			    g - s->first_displayed_entry->idx - 1);
4086 		if (err)
4087 			return err;
4088 	} else if (idx + 1 > g)
4089 		log_move_cursor_up(view, idx - g + 1, 0);
4090 
4091 	if (g < nlines && s->first_displayed_entry->idx == 0)
4092 		s->selected = g - 1;
4093 
4094 	select_commit(s);
4095 	return NULL;
4096 
4097 }
4098 
4099 static void
4100 horizontal_scroll_input(struct tog_view *view, int ch)
4101 {
4102 
4103 	switch (ch) {
4104 	case KEY_LEFT:
4105 	case 'h':
4106 		view->x -= MIN(view->x, 2);
4107 		if (view->x <= 0)
4108 			view->count = 0;
4109 		break;
4110 	case KEY_RIGHT:
4111 	case 'l':
4112 		if (view->x + view->ncols / 2 < view->maxx)
4113 			view->x += 2;
4114 		else
4115 			view->count = 0;
4116 		break;
4117 	case '0':
4118 		view->x = 0;
4119 		break;
4120 	case '$':
4121 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4122 		view->count = 0;
4123 		break;
4124 	default:
4125 		break;
4126 	}
4127 }
4128 
4129 static const struct got_error *
4130 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4131 {
4132 	const struct got_error *err = NULL;
4133 	struct tog_log_view_state *s = &view->state.log;
4134 	int eos, nscroll;
4135 
4136 	if (s->thread_args.load_all) {
4137 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4138 			s->thread_args.load_all = 0;
4139 		else if (s->thread_args.log_complete) {
4140 			err = log_move_cursor_down(view, s->commits->ncommits);
4141 			s->thread_args.load_all = 0;
4142 		}
4143 		if (err)
4144 			return err;
4145 	}
4146 
4147 	eos = nscroll = view->nlines - 1;
4148 	if (view_is_hsplit_top(view))
4149 		--eos;  /* border */
4150 
4151 	if (view->gline)
4152 		return log_goto_line(view, eos);
4153 
4154 	switch (ch) {
4155 	case '&':
4156 		err = limit_log_view(view);
4157 		break;
4158 	case 'q':
4159 		s->quit = 1;
4160 		break;
4161 	case '0':
4162 	case '$':
4163 	case KEY_RIGHT:
4164 	case 'l':
4165 	case KEY_LEFT:
4166 	case 'h':
4167 		horizontal_scroll_input(view, ch);
4168 		break;
4169 	case 'k':
4170 	case KEY_UP:
4171 	case '<':
4172 	case ',':
4173 	case CTRL('p'):
4174 		log_move_cursor_up(view, 0, 0);
4175 		break;
4176 	case 'g':
4177 	case '=':
4178 	case KEY_HOME:
4179 		log_move_cursor_up(view, 0, 1);
4180 		view->count = 0;
4181 		break;
4182 	case CTRL('u'):
4183 	case 'u':
4184 		nscroll /= 2;
4185 		/* FALL THROUGH */
4186 	case KEY_PPAGE:
4187 	case CTRL('b'):
4188 	case 'b':
4189 		log_move_cursor_up(view, nscroll, 0);
4190 		break;
4191 	case 'j':
4192 	case KEY_DOWN:
4193 	case '>':
4194 	case '.':
4195 	case CTRL('n'):
4196 		err = log_move_cursor_down(view, 0);
4197 		break;
4198 	case '@':
4199 		s->use_committer = !s->use_committer;
4200 		view->action = s->use_committer ?
4201 		    "show committer" : "show commit author";
4202 		break;
4203 	case 'G':
4204 	case '*':
4205 	case KEY_END: {
4206 		/* We don't know yet how many commits, so we're forced to
4207 		 * traverse them all. */
4208 		view->count = 0;
4209 		s->thread_args.load_all = 1;
4210 		if (!s->thread_args.log_complete)
4211 			return trigger_log_thread(view, 0);
4212 		err = log_move_cursor_down(view, s->commits->ncommits);
4213 		s->thread_args.load_all = 0;
4214 		break;
4215 	}
4216 	case CTRL('d'):
4217 	case 'd':
4218 		nscroll /= 2;
4219 		/* FALL THROUGH */
4220 	case KEY_NPAGE:
4221 	case CTRL('f'):
4222 	case 'f':
4223 	case ' ':
4224 		err = log_move_cursor_down(view, nscroll);
4225 		break;
4226 	case KEY_RESIZE:
4227 		if (s->selected > view->nlines - 2)
4228 			s->selected = view->nlines - 2;
4229 		if (s->selected > s->commits->ncommits - 1)
4230 			s->selected = s->commits->ncommits - 1;
4231 		select_commit(s);
4232 		if (s->commits->ncommits < view->nlines - 1 &&
4233 		    !s->thread_args.log_complete) {
4234 			s->thread_args.commits_needed += (view->nlines - 1) -
4235 			    s->commits->ncommits;
4236 			err = trigger_log_thread(view, 1);
4237 		}
4238 		break;
4239 	case KEY_ENTER:
4240 	case '\r':
4241 		view->count = 0;
4242 		if (s->selected_entry == NULL)
4243 			break;
4244 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4245 		break;
4246 	case 'T':
4247 		view->count = 0;
4248 		if (s->selected_entry == NULL)
4249 			break;
4250 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4251 		break;
4252 	case KEY_BACKSPACE:
4253 	case CTRL('l'):
4254 	case 'B':
4255 		view->count = 0;
4256 		if (ch == KEY_BACKSPACE &&
4257 		    got_path_is_root_dir(s->in_repo_path))
4258 			break;
4259 		err = stop_log_thread(s);
4260 		if (err)
4261 			return err;
4262 		if (ch == KEY_BACKSPACE) {
4263 			char *parent_path;
4264 			err = got_path_dirname(&parent_path, s->in_repo_path);
4265 			if (err)
4266 				return err;
4267 			free(s->in_repo_path);
4268 			s->in_repo_path = parent_path;
4269 			s->thread_args.in_repo_path = s->in_repo_path;
4270 		} else if (ch == CTRL('l')) {
4271 			struct got_object_id *start_id;
4272 			err = got_repo_match_object_id(&start_id, NULL,
4273 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4274 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4275 			if (err) {
4276 				if (s->head_ref_name == NULL ||
4277 				    err->code != GOT_ERR_NOT_REF)
4278 					return err;
4279 				/* Try to cope with deleted references. */
4280 				free(s->head_ref_name);
4281 				s->head_ref_name = NULL;
4282 				err = got_repo_match_object_id(&start_id,
4283 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4284 				    &tog_refs, s->repo);
4285 				if (err)
4286 					return err;
4287 			}
4288 			free(s->start_id);
4289 			s->start_id = start_id;
4290 			s->thread_args.start_id = s->start_id;
4291 		} else /* 'B' */
4292 			s->log_branches = !s->log_branches;
4293 
4294 		if (s->thread_args.pack_fds == NULL) {
4295 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4296 			if (err)
4297 				return err;
4298 		}
4299 		err = got_repo_open(&s->thread_args.repo,
4300 		    got_repo_get_path(s->repo), NULL,
4301 		    s->thread_args.pack_fds);
4302 		if (err)
4303 			return err;
4304 		tog_free_refs();
4305 		err = tog_load_refs(s->repo, 0);
4306 		if (err)
4307 			return err;
4308 		err = got_commit_graph_open(&s->thread_args.graph,
4309 		    s->in_repo_path, !s->log_branches);
4310 		if (err)
4311 			return err;
4312 		err = got_commit_graph_iter_start(s->thread_args.graph,
4313 		    s->start_id, s->repo, NULL, NULL);
4314 		if (err)
4315 			return err;
4316 		free_commits(&s->real_commits);
4317 		free_commits(&s->limit_commits);
4318 		s->first_displayed_entry = NULL;
4319 		s->last_displayed_entry = NULL;
4320 		s->selected_entry = NULL;
4321 		s->selected = 0;
4322 		s->thread_args.log_complete = 0;
4323 		s->quit = 0;
4324 		s->thread_args.commits_needed = view->lines;
4325 		s->matched_entry = NULL;
4326 		s->search_entry = NULL;
4327 		view->offset = 0;
4328 		break;
4329 	case 'R':
4330 		view->count = 0;
4331 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4332 		break;
4333 	default:
4334 		view->count = 0;
4335 		break;
4336 	}
4337 
4338 	return err;
4339 }
4340 
4341 static const struct got_error *
4342 apply_unveil(const char *repo_path, const char *worktree_path)
4343 {
4344 	const struct got_error *error;
4345 
4346 #ifdef PROFILE
4347 	if (unveil("gmon.out", "rwc") != 0)
4348 		return got_error_from_errno2("unveil", "gmon.out");
4349 #endif
4350 	if (repo_path && unveil(repo_path, "r") != 0)
4351 		return got_error_from_errno2("unveil", repo_path);
4352 
4353 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4354 		return got_error_from_errno2("unveil", worktree_path);
4355 
4356 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4357 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4358 
4359 	error = got_privsep_unveil_exec_helpers();
4360 	if (error != NULL)
4361 		return error;
4362 
4363 	if (unveil(NULL, NULL) != 0)
4364 		return got_error_from_errno("unveil");
4365 
4366 	return NULL;
4367 }
4368 
4369 static const struct got_error *
4370 init_mock_term(const char *test_script_path)
4371 {
4372 	const struct got_error	*err = NULL;
4373 	const char *screen_dump_path;
4374 	int in;
4375 
4376 	if (test_script_path == NULL || *test_script_path == '\0')
4377 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4378 
4379 	tog_io.f = fopen(test_script_path, "re");
4380 	if (tog_io.f == NULL) {
4381 		err = got_error_from_errno_fmt("fopen: %s",
4382 		    test_script_path);
4383 		goto done;
4384 	}
4385 
4386 	/* test mode, we don't want any output */
4387 	tog_io.cout = fopen("/dev/null", "w+");
4388 	if (tog_io.cout == NULL) {
4389 		err = got_error_from_errno2("fopen", "/dev/null");
4390 		goto done;
4391 	}
4392 
4393 	in = dup(fileno(tog_io.cout));
4394 	if (in == -1) {
4395 		err = got_error_from_errno("dup");
4396 		goto done;
4397 	}
4398 	tog_io.cin = fdopen(in, "r");
4399 	if (tog_io.cin == NULL) {
4400 		err = got_error_from_errno("fdopen");
4401 		close(in);
4402 		goto done;
4403 	}
4404 
4405 	screen_dump_path = getenv("TOG_SCR_DUMP");
4406 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4407 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4408 	tog_io.sdump = fopen(screen_dump_path, "we");
4409 	if (tog_io.sdump == NULL) {
4410 		err = got_error_from_errno2("fopen", screen_dump_path);
4411 		goto done;
4412 	}
4413 
4414 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4415 		err = got_error_from_errno("fseeko");
4416 		goto done;
4417 	}
4418 
4419 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4420 		err = got_error_msg(GOT_ERR_IO,
4421 		    "newterm: failed to initialise curses");
4422 
4423 	using_mock_io = 1;
4424 
4425 done:
4426 	if (err)
4427 		tog_io_close();
4428 	return err;
4429 }
4430 
4431 static void
4432 init_curses(void)
4433 {
4434 	if (using_mock_io) /* In test mode we use a fake terminal */
4435 		return;
4436 
4437 	initscr();
4438 
4439 	cbreak();
4440 	halfdelay(1); /* Fast refresh while initial view is loading. */
4441 	noecho();
4442 	nonl();
4443 	intrflush(stdscr, FALSE);
4444 	keypad(stdscr, TRUE);
4445 	curs_set(0);
4446 	if (getenv("TOG_COLORS") != NULL) {
4447 		start_color();
4448 		use_default_colors();
4449 	}
4450 
4451 	return;
4452 }
4453 
4454 static const struct got_error *
4455 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4456 {
4457 	tog_base_commit.id = got_object_id_dup(
4458 	    got_worktree_get_base_commit_id(worktree));
4459 	if (tog_base_commit.id == NULL)
4460 		return got_error_from_errno( "got_object_id_dup");
4461 
4462 	return NULL;
4463 }
4464 
4465 static const struct got_error *
4466 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4467     struct got_repository *repo, struct got_worktree *worktree)
4468 {
4469 	const struct got_error *err = NULL;
4470 
4471 	if (argc == 0) {
4472 		*in_repo_path = strdup("/");
4473 		if (*in_repo_path == NULL)
4474 			return got_error_from_errno("strdup");
4475 		return NULL;
4476 	}
4477 
4478 	if (worktree) {
4479 		const char *prefix = got_worktree_get_path_prefix(worktree);
4480 		char *p;
4481 
4482 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4483 		if (err)
4484 			return err;
4485 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4486 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4487 		    p) == -1) {
4488 			err = got_error_from_errno("asprintf");
4489 			*in_repo_path = NULL;
4490 		}
4491 		free(p);
4492 	} else
4493 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4494 
4495 	return err;
4496 }
4497 
4498 static const struct got_error *
4499 cmd_log(int argc, char *argv[])
4500 {
4501 	const struct got_error *error;
4502 	struct got_repository *repo = NULL;
4503 	struct got_worktree *worktree = NULL;
4504 	struct got_object_id *start_id = NULL;
4505 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4506 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4507 	struct got_reference *ref = NULL;
4508 	const char *head_ref_name = NULL;
4509 	int ch, log_branches = 0;
4510 	struct tog_view *view;
4511 	int *pack_fds = NULL;
4512 
4513 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4514 		switch (ch) {
4515 		case 'b':
4516 			log_branches = 1;
4517 			break;
4518 		case 'c':
4519 			start_commit = optarg;
4520 			break;
4521 		case 'r':
4522 			repo_path = realpath(optarg, NULL);
4523 			if (repo_path == NULL)
4524 				return got_error_from_errno2("realpath",
4525 				    optarg);
4526 			break;
4527 		default:
4528 			usage_log();
4529 			/* NOTREACHED */
4530 		}
4531 	}
4532 
4533 	argc -= optind;
4534 	argv += optind;
4535 
4536 	if (argc > 1)
4537 		usage_log();
4538 
4539 	error = got_repo_pack_fds_open(&pack_fds);
4540 	if (error != NULL)
4541 		goto done;
4542 
4543 	if (repo_path == NULL) {
4544 		cwd = getcwd(NULL, 0);
4545 		if (cwd == NULL) {
4546 			error = got_error_from_errno("getcwd");
4547 			goto done;
4548 		}
4549 		error = got_worktree_open(&worktree, cwd, NULL);
4550 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4551 			goto done;
4552 		if (worktree)
4553 			repo_path =
4554 			    strdup(got_worktree_get_repo_path(worktree));
4555 		else
4556 			repo_path = strdup(cwd);
4557 		if (repo_path == NULL) {
4558 			error = got_error_from_errno("strdup");
4559 			goto done;
4560 		}
4561 	}
4562 
4563 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4564 	if (error != NULL)
4565 		goto done;
4566 
4567 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4568 	    repo, worktree);
4569 	if (error)
4570 		goto done;
4571 
4572 	init_curses();
4573 
4574 	error = apply_unveil(got_repo_get_path(repo),
4575 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4576 	if (error)
4577 		goto done;
4578 
4579 	/* already loaded by tog_log_with_path()? */
4580 	if (TAILQ_EMPTY(&tog_refs)) {
4581 		error = tog_load_refs(repo, 0);
4582 		if (error)
4583 			goto done;
4584 	}
4585 
4586 	if (start_commit == NULL) {
4587 		error = got_repo_match_object_id(&start_id, &label,
4588 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4589 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4590 		if (error)
4591 			goto done;
4592 		head_ref_name = label;
4593 	} else {
4594 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4595 		    repo, worktree);
4596 		if (error != NULL)
4597 			goto done;
4598 		if (keyword_idstr != NULL)
4599 			start_commit = keyword_idstr;
4600 
4601 		error = got_ref_open(&ref, repo, start_commit, 0);
4602 		if (error == NULL)
4603 			head_ref_name = got_ref_get_name(ref);
4604 		else if (error->code != GOT_ERR_NOT_REF)
4605 			goto done;
4606 		error = got_repo_match_object_id(&start_id, NULL,
4607 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4608 		if (error)
4609 			goto done;
4610 	}
4611 
4612 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4613 	if (view == NULL) {
4614 		error = got_error_from_errno("view_open");
4615 		goto done;
4616 	}
4617 
4618 	if (worktree) {
4619 		error = set_tog_base_commit(repo, worktree);
4620 		if (error != NULL)
4621 			goto done;
4622 	}
4623 
4624 	error = open_log_view(view, start_id, repo, head_ref_name,
4625 	    in_repo_path, log_branches, worktree);
4626 	if (error)
4627 		goto done;
4628 
4629 	if (worktree) {
4630 		/* The work tree will be closed by the log thread. */
4631 		worktree = NULL;
4632 	}
4633 
4634 	error = view_loop(view);
4635 
4636 done:
4637 	free(tog_base_commit.id);
4638 	free(keyword_idstr);
4639 	free(in_repo_path);
4640 	free(repo_path);
4641 	free(cwd);
4642 	free(start_id);
4643 	free(label);
4644 	if (ref)
4645 		got_ref_close(ref);
4646 	if (repo) {
4647 		const struct got_error *close_err = got_repo_close(repo);
4648 		if (error == NULL)
4649 			error = close_err;
4650 	}
4651 	if (worktree)
4652 		got_worktree_close(worktree);
4653 	if (pack_fds) {
4654 		const struct got_error *pack_err =
4655 		    got_repo_pack_fds_close(pack_fds);
4656 		if (error == NULL)
4657 			error = pack_err;
4658 	}
4659 	tog_free_refs();
4660 	return error;
4661 }
4662 
4663 __dead static void
4664 usage_diff(void)
4665 {
4666 	endwin();
4667 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4668 	    "object1 object2\n", getprogname());
4669 	exit(1);
4670 }
4671 
4672 static int
4673 match_line(const char *line, regex_t *regex, size_t nmatch,
4674     regmatch_t *regmatch)
4675 {
4676 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4677 }
4678 
4679 static struct tog_color *
4680 match_color(struct tog_colors *colors, const char *line)
4681 {
4682 	struct tog_color *tc = NULL;
4683 
4684 	STAILQ_FOREACH(tc, colors, entry) {
4685 		if (match_line(line, &tc->regex, 0, NULL))
4686 			return tc;
4687 	}
4688 
4689 	return NULL;
4690 }
4691 
4692 static const struct got_error *
4693 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4694     WINDOW *window, int skipcol, regmatch_t *regmatch)
4695 {
4696 	const struct got_error *err = NULL;
4697 	char *exstr = NULL;
4698 	wchar_t *wline = NULL;
4699 	int rme, rms, n, width, scrollx;
4700 	int width0 = 0, width1 = 0, width2 = 0;
4701 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4702 
4703 	*wtotal = 0;
4704 
4705 	rms = regmatch->rm_so;
4706 	rme = regmatch->rm_eo;
4707 
4708 	err = expand_tab(&exstr, line);
4709 	if (err)
4710 		return err;
4711 
4712 	/* Split the line into 3 segments, according to match offsets. */
4713 	seg0 = strndup(exstr, rms);
4714 	if (seg0 == NULL) {
4715 		err = got_error_from_errno("strndup");
4716 		goto done;
4717 	}
4718 	seg1 = strndup(exstr + rms, rme - rms);
4719 	if (seg1 == NULL) {
4720 		err = got_error_from_errno("strndup");
4721 		goto done;
4722 	}
4723 	seg2 = strdup(exstr + rme);
4724 	if (seg2 == NULL) {
4725 		err = got_error_from_errno("strndup");
4726 		goto done;
4727 	}
4728 
4729 	/* draw up to matched token if we haven't scrolled past it */
4730 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4731 	    col_tab_align, 1);
4732 	if (err)
4733 		goto done;
4734 	n = MAX(width0 - skipcol, 0);
4735 	if (n) {
4736 		free(wline);
4737 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4738 		    wlimit, col_tab_align, 1);
4739 		if (err)
4740 			goto done;
4741 		waddwstr(window, &wline[scrollx]);
4742 		wlimit -= width;
4743 		*wtotal += width;
4744 	}
4745 
4746 	if (wlimit > 0) {
4747 		int i = 0, w = 0;
4748 		size_t wlen;
4749 
4750 		free(wline);
4751 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4752 		    col_tab_align, 1);
4753 		if (err)
4754 			goto done;
4755 		wlen = wcslen(wline);
4756 		while (i < wlen) {
4757 			width = wcwidth(wline[i]);
4758 			if (width == -1) {
4759 				/* should not happen, tabs are expanded */
4760 				err = got_error(GOT_ERR_RANGE);
4761 				goto done;
4762 			}
4763 			if (width0 + w + width > skipcol)
4764 				break;
4765 			w += width;
4766 			i++;
4767 		}
4768 		/* draw (visible part of) matched token (if scrolled into it) */
4769 		if (width1 - w > 0) {
4770 			wattron(window, A_STANDOUT);
4771 			waddwstr(window, &wline[i]);
4772 			wattroff(window, A_STANDOUT);
4773 			wlimit -= (width1 - w);
4774 			*wtotal += (width1 - w);
4775 		}
4776 	}
4777 
4778 	if (wlimit > 0) {  /* draw rest of line */
4779 		free(wline);
4780 		if (skipcol > width0 + width1) {
4781 			err = format_line(&wline, &width2, &scrollx, seg2,
4782 			    skipcol - (width0 + width1), wlimit,
4783 			    col_tab_align, 1);
4784 			if (err)
4785 				goto done;
4786 			waddwstr(window, &wline[scrollx]);
4787 		} else {
4788 			err = format_line(&wline, &width2, NULL, seg2, 0,
4789 			    wlimit, col_tab_align, 1);
4790 			if (err)
4791 				goto done;
4792 			waddwstr(window, wline);
4793 		}
4794 		*wtotal += width2;
4795 	}
4796 done:
4797 	free(wline);
4798 	free(exstr);
4799 	free(seg0);
4800 	free(seg1);
4801 	free(seg2);
4802 	return err;
4803 }
4804 
4805 static int
4806 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4807 {
4808 	FILE	*f = NULL;
4809 	int	*eof, *first, *selected;
4810 
4811 	if (view->type == TOG_VIEW_DIFF) {
4812 		struct tog_diff_view_state *s = &view->state.diff;
4813 
4814 		first = &s->first_displayed_line;
4815 		selected = first;
4816 		eof = &s->eof;
4817 		f = s->f;
4818 	} else if (view->type == TOG_VIEW_HELP) {
4819 		struct tog_help_view_state *s = &view->state.help;
4820 
4821 		first = &s->first_displayed_line;
4822 		selected = first;
4823 		eof = &s->eof;
4824 		f = s->f;
4825 	} else if (view->type == TOG_VIEW_BLAME) {
4826 		struct tog_blame_view_state *s = &view->state.blame;
4827 
4828 		first = &s->first_displayed_line;
4829 		selected = &s->selected_line;
4830 		eof = &s->eof;
4831 		f = s->blame.f;
4832 	} else
4833 		return 0;
4834 
4835 	/* Center gline in the middle of the page like vi(1). */
4836 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4837 		return 0;
4838 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4839 		rewind(f);
4840 		*eof = 0;
4841 		*first = 1;
4842 		*lineno = 0;
4843 		*nprinted = 0;
4844 		return 0;
4845 	}
4846 
4847 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4848 		view->gline : (view->nlines - 3) / 2 + 1;
4849 	view->gline = 0;
4850 
4851 	return 1;
4852 }
4853 
4854 static const struct got_error *
4855 draw_file(struct tog_view *view, const char *header)
4856 {
4857 	struct tog_diff_view_state *s = &view->state.diff;
4858 	regmatch_t *regmatch = &view->regmatch;
4859 	const struct got_error *err;
4860 	int nprinted = 0;
4861 	char *line;
4862 	size_t linesize = 0;
4863 	ssize_t linelen;
4864 	wchar_t *wline;
4865 	int width;
4866 	int max_lines = view->nlines;
4867 	int nlines = s->nlines;
4868 	off_t line_offset;
4869 
4870 	s->lineno = s->first_displayed_line - 1;
4871 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4872 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4873 		return got_error_from_errno("fseek");
4874 
4875 	werase(view->window);
4876 
4877 	if (view->gline > s->nlines - 1)
4878 		view->gline = s->nlines - 1;
4879 
4880 	if (header) {
4881 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4882 		    1 : view->gline - (view->nlines - 3) / 2 :
4883 		    s->lineno + s->selected_line;
4884 
4885 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4886 			return got_error_from_errno("asprintf");
4887 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4888 		    0, 0);
4889 		free(line);
4890 		if (err)
4891 			return err;
4892 
4893 		if (view_needs_focus_indication(view))
4894 			wstandout(view->window);
4895 		waddwstr(view->window, wline);
4896 		free(wline);
4897 		wline = NULL;
4898 		while (width++ < view->ncols)
4899 			waddch(view->window, ' ');
4900 		if (view_needs_focus_indication(view))
4901 			wstandend(view->window);
4902 
4903 		if (max_lines <= 1)
4904 			return NULL;
4905 		max_lines--;
4906 	}
4907 
4908 	s->eof = 0;
4909 	view->maxx = 0;
4910 	line = NULL;
4911 	while (max_lines > 0 && nprinted < max_lines) {
4912 		enum got_diff_line_type linetype;
4913 		attr_t attr = 0;
4914 
4915 		linelen = getline(&line, &linesize, s->f);
4916 		if (linelen == -1) {
4917 			if (feof(s->f)) {
4918 				s->eof = 1;
4919 				break;
4920 			}
4921 			free(line);
4922 			return got_ferror(s->f, GOT_ERR_IO);
4923 		}
4924 
4925 		if (++s->lineno < s->first_displayed_line)
4926 			continue;
4927 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4928 			continue;
4929 		if (s->lineno == view->hiline)
4930 			attr = A_STANDOUT;
4931 
4932 		/* Set view->maxx based on full line length. */
4933 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4934 		    view->x ? 1 : 0);
4935 		if (err) {
4936 			free(line);
4937 			return err;
4938 		}
4939 		view->maxx = MAX(view->maxx, width);
4940 		free(wline);
4941 		wline = NULL;
4942 
4943 		linetype = s->lines[s->lineno].type;
4944 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4945 		    linetype < GOT_DIFF_LINE_CONTEXT)
4946 			attr |= COLOR_PAIR(linetype);
4947 		if (attr)
4948 			wattron(view->window, attr);
4949 		if (s->first_displayed_line + nprinted == s->matched_line &&
4950 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4951 			err = add_matched_line(&width, line, view->ncols, 0,
4952 			    view->window, view->x, regmatch);
4953 			if (err) {
4954 				free(line);
4955 				return err;
4956 			}
4957 		} else {
4958 			int skip;
4959 			err = format_line(&wline, &width, &skip, line,
4960 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4961 			if (err) {
4962 				free(line);
4963 				return err;
4964 			}
4965 			waddwstr(view->window, &wline[skip]);
4966 			free(wline);
4967 			wline = NULL;
4968 		}
4969 		if (s->lineno == view->hiline) {
4970 			/* highlight full gline length */
4971 			while (width++ < view->ncols)
4972 				waddch(view->window, ' ');
4973 		} else {
4974 			if (width <= view->ncols - 1)
4975 				waddch(view->window, '\n');
4976 		}
4977 		if (attr)
4978 			wattroff(view->window, attr);
4979 		if (++nprinted == 1)
4980 			s->first_displayed_line = s->lineno;
4981 	}
4982 	free(line);
4983 	if (nprinted >= 1)
4984 		s->last_displayed_line = s->first_displayed_line +
4985 		    (nprinted - 1);
4986 	else
4987 		s->last_displayed_line = s->first_displayed_line;
4988 
4989 	view_border(view);
4990 
4991 	if (s->eof) {
4992 		while (nprinted < view->nlines) {
4993 			waddch(view->window, '\n');
4994 			nprinted++;
4995 		}
4996 
4997 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4998 		    view->ncols, 0, 0);
4999 		if (err) {
5000 			return err;
5001 		}
5002 
5003 		wstandout(view->window);
5004 		waddwstr(view->window, wline);
5005 		free(wline);
5006 		wline = NULL;
5007 		wstandend(view->window);
5008 	}
5009 
5010 	return NULL;
5011 }
5012 
5013 static char *
5014 get_datestr(time_t *time, char *datebuf)
5015 {
5016 	struct tm mytm, *tm;
5017 	char *p, *s;
5018 
5019 	tm = gmtime_r(time, &mytm);
5020 	if (tm == NULL)
5021 		return NULL;
5022 	s = asctime_r(tm, datebuf);
5023 	if (s == NULL)
5024 		return NULL;
5025 	p = strchr(s, '\n');
5026 	if (p)
5027 		*p = '\0';
5028 	return s;
5029 }
5030 
5031 static const struct got_error *
5032 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5033     off_t off, uint8_t type)
5034 {
5035 	struct got_diff_line *p;
5036 
5037 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5038 	if (p == NULL)
5039 		return got_error_from_errno("reallocarray");
5040 	*lines = p;
5041 	(*lines)[*nlines].offset = off;
5042 	(*lines)[*nlines].type = type;
5043 	(*nlines)++;
5044 
5045 	return NULL;
5046 }
5047 
5048 static const struct got_error *
5049 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5050     struct got_diff_line *s_lines, size_t s_nlines)
5051 {
5052 	struct got_diff_line	*p;
5053 	char			 buf[BUFSIZ];
5054 	size_t			 i, r;
5055 
5056 	if (fseeko(src, 0L, SEEK_SET) == -1)
5057 		return got_error_from_errno("fseeko");
5058 
5059 	for (;;) {
5060 		r = fread(buf, 1, sizeof(buf), src);
5061 		if (r == 0) {
5062 			if (ferror(src))
5063 				return got_error_from_errno("fread");
5064 			if (feof(src))
5065 				break;
5066 		}
5067 		if (fwrite(buf, 1, r, dst) != r)
5068 			return got_ferror(dst, GOT_ERR_IO);
5069 	}
5070 
5071 	if (s_nlines == 0 && *d_nlines == 0)
5072 		return NULL;
5073 
5074 	/*
5075 	 * If commit info was in dst, increment line offsets
5076 	 * of the appended diff content, but skip s_lines[0]
5077 	 * because offset zero is already in *d_lines.
5078 	 */
5079 	if (*d_nlines > 0) {
5080 		for (i = 1; i < s_nlines; ++i)
5081 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5082 
5083 		if (s_nlines > 0) {
5084 			--s_nlines;
5085 			++s_lines;
5086 		}
5087 	}
5088 
5089 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5090 	if (p == NULL) {
5091 		/* d_lines is freed in close_diff_view() */
5092 		return got_error_from_errno("reallocarray");
5093 	}
5094 
5095 	*d_lines = p;
5096 
5097 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5098 	*d_nlines += s_nlines;
5099 
5100 	return NULL;
5101 }
5102 
5103 static const struct got_error *
5104 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5105     struct got_object_id *commit_id, struct got_reflist_head *refs,
5106     struct got_repository *repo, int ignore_ws, int force_text_diff,
5107     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5108 {
5109 	const struct got_error *err = NULL;
5110 	char datebuf[26], *datestr;
5111 	struct got_commit_object *commit;
5112 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5113 	time_t committer_time;
5114 	const char *author, *committer;
5115 	char *refs_str = NULL;
5116 	struct got_pathlist_entry *pe;
5117 	off_t outoff = 0;
5118 	int n;
5119 
5120 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5121 	if (err)
5122 		return err;
5123 
5124 	err = got_object_open_as_commit(&commit, repo, commit_id);
5125 	if (err)
5126 		return err;
5127 
5128 	err = got_object_id_str(&id_str, commit_id);
5129 	if (err) {
5130 		err = got_error_from_errno("got_object_id_str");
5131 		goto done;
5132 	}
5133 
5134 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5135 	if (err)
5136 		goto done;
5137 
5138 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5139 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5140 	if (n < 0) {
5141 		err = got_error_from_errno("fprintf");
5142 		goto done;
5143 	}
5144 	outoff += n;
5145 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5146 	if (err)
5147 		goto done;
5148 
5149 	n = fprintf(outfile, "from: %s\n",
5150 	    got_object_commit_get_author(commit));
5151 	if (n < 0) {
5152 		err = got_error_from_errno("fprintf");
5153 		goto done;
5154 	}
5155 	outoff += n;
5156 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5157 	if (err)
5158 		goto done;
5159 
5160 	author = got_object_commit_get_author(commit);
5161 	committer = got_object_commit_get_committer(commit);
5162 	if (strcmp(author, committer) != 0) {
5163 		n = fprintf(outfile, "via: %s\n", committer);
5164 		if (n < 0) {
5165 			err = got_error_from_errno("fprintf");
5166 			goto done;
5167 		}
5168 		outoff += n;
5169 		err = add_line_metadata(lines, nlines, outoff,
5170 		    GOT_DIFF_LINE_AUTHOR);
5171 		if (err)
5172 			goto done;
5173 	}
5174 	committer_time = got_object_commit_get_committer_time(commit);
5175 	datestr = get_datestr(&committer_time, datebuf);
5176 	if (datestr) {
5177 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5178 		if (n < 0) {
5179 			err = got_error_from_errno("fprintf");
5180 			goto done;
5181 		}
5182 		outoff += n;
5183 		err = add_line_metadata(lines, nlines, outoff,
5184 		    GOT_DIFF_LINE_DATE);
5185 		if (err)
5186 			goto done;
5187 	}
5188 	if (got_object_commit_get_nparents(commit) > 1) {
5189 		const struct got_object_id_queue *parent_ids;
5190 		struct got_object_qid *qid;
5191 		int pn = 1;
5192 		parent_ids = got_object_commit_get_parent_ids(commit);
5193 		STAILQ_FOREACH(qid, parent_ids, entry) {
5194 			err = got_object_id_str(&id_str, &qid->id);
5195 			if (err)
5196 				goto done;
5197 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5198 			if (n < 0) {
5199 				err = got_error_from_errno("fprintf");
5200 				goto done;
5201 			}
5202 			outoff += n;
5203 			err = add_line_metadata(lines, nlines, outoff,
5204 			    GOT_DIFF_LINE_META);
5205 			if (err)
5206 				goto done;
5207 			free(id_str);
5208 			id_str = NULL;
5209 		}
5210 	}
5211 
5212 	err = got_object_commit_get_logmsg(&logmsg, commit);
5213 	if (err)
5214 		goto done;
5215 	s = logmsg;
5216 	while ((line = strsep(&s, "\n")) != NULL) {
5217 		n = fprintf(outfile, "%s\n", line);
5218 		if (n < 0) {
5219 			err = got_error_from_errno("fprintf");
5220 			goto done;
5221 		}
5222 		outoff += n;
5223 		err = add_line_metadata(lines, nlines, outoff,
5224 		    GOT_DIFF_LINE_LOGMSG);
5225 		if (err)
5226 			goto done;
5227 	}
5228 
5229 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5230 		struct got_diff_changed_path *cp = pe->data;
5231 		int pad = dsa->max_path_len - pe->path_len + 1;
5232 
5233 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5234 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5235 		    dsa->rm_cols + 1, cp->rm);
5236 		if (n < 0) {
5237 			err = got_error_from_errno("fprintf");
5238 			goto done;
5239 		}
5240 		outoff += n;
5241 		err = add_line_metadata(lines, nlines, outoff,
5242 		    GOT_DIFF_LINE_CHANGES);
5243 		if (err)
5244 			goto done;
5245 	}
5246 
5247 	fputc('\n', outfile);
5248 	outoff++;
5249 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5250 	if (err)
5251 		goto done;
5252 
5253 	n = fprintf(outfile,
5254 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5255 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5256 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5257 	if (n < 0) {
5258 		err = got_error_from_errno("fprintf");
5259 		goto done;
5260 	}
5261 	outoff += n;
5262 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5263 	if (err)
5264 		goto done;
5265 
5266 	fputc('\n', outfile);
5267 	outoff++;
5268 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5269 done:
5270 	free(id_str);
5271 	free(logmsg);
5272 	free(refs_str);
5273 	got_object_commit_close(commit);
5274 	if (err) {
5275 		free(*lines);
5276 		*lines = NULL;
5277 		*nlines = 0;
5278 	}
5279 	return err;
5280 }
5281 
5282 static const struct got_error *
5283 create_diff(struct tog_diff_view_state *s)
5284 {
5285 	const struct got_error *err = NULL;
5286 	FILE *f = NULL, *tmp_diff_file = NULL;
5287 	int obj_type;
5288 	struct got_diff_line *lines = NULL;
5289 	struct got_pathlist_head changed_paths;
5290 
5291 	TAILQ_INIT(&changed_paths);
5292 
5293 	free(s->lines);
5294 	s->lines = malloc(sizeof(*s->lines));
5295 	if (s->lines == NULL)
5296 		return got_error_from_errno("malloc");
5297 	s->nlines = 0;
5298 
5299 	f = got_opentemp();
5300 	if (f == NULL) {
5301 		err = got_error_from_errno("got_opentemp");
5302 		goto done;
5303 	}
5304 	tmp_diff_file = got_opentemp();
5305 	if (tmp_diff_file == NULL) {
5306 		err = got_error_from_errno("got_opentemp");
5307 		goto done;
5308 	}
5309 	if (s->f && fclose(s->f) == EOF) {
5310 		err = got_error_from_errno("fclose");
5311 		goto done;
5312 	}
5313 	s->f = f;
5314 
5315 	if (s->id1)
5316 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5317 	else
5318 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5319 	if (err)
5320 		goto done;
5321 
5322 	switch (obj_type) {
5323 	case GOT_OBJ_TYPE_BLOB:
5324 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5325 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5326 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5327 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5328 		    s->f);
5329 		break;
5330 	case GOT_OBJ_TYPE_TREE:
5331 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5332 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5333 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5334 		    s->force_text_diff, NULL, s->repo, s->f);
5335 		break;
5336 	case GOT_OBJ_TYPE_COMMIT: {
5337 		const struct got_object_id_queue *parent_ids;
5338 		struct got_object_qid *pid;
5339 		struct got_commit_object *commit2;
5340 		struct got_reflist_head *refs;
5341 		size_t nlines = 0;
5342 		struct got_diffstat_cb_arg dsa = {
5343 			0, 0, 0, 0, 0, 0,
5344 			&changed_paths,
5345 			s->ignore_whitespace,
5346 			s->force_text_diff,
5347 			tog_diff_algo
5348 		};
5349 
5350 		lines = malloc(sizeof(*lines));
5351 		if (lines == NULL) {
5352 			err = got_error_from_errno("malloc");
5353 			goto done;
5354 		}
5355 
5356 		/* build diff first in tmp file then append to commit info */
5357 		err = got_diff_objects_as_commits(&lines, &nlines,
5358 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5359 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5360 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5361 		if (err)
5362 			break;
5363 
5364 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5365 		if (err)
5366 			goto done;
5367 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5368 		/* Show commit info if we're diffing to a parent/root commit. */
5369 		if (s->id1 == NULL) {
5370 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5371 			    refs, s->repo, s->ignore_whitespace,
5372 			    s->force_text_diff, &dsa, s->f);
5373 			if (err)
5374 				goto done;
5375 		} else {
5376 			parent_ids = got_object_commit_get_parent_ids(commit2);
5377 			STAILQ_FOREACH(pid, parent_ids, entry) {
5378 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5379 					err = write_commit_info(&s->lines,
5380 					    &s->nlines, s->id2, refs, s->repo,
5381 					    s->ignore_whitespace,
5382 					    s->force_text_diff, &dsa, s->f);
5383 					if (err)
5384 						goto done;
5385 					break;
5386 				}
5387 			}
5388 		}
5389 		got_object_commit_close(commit2);
5390 
5391 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5392 		    lines, nlines);
5393 		break;
5394 	}
5395 	default:
5396 		err = got_error(GOT_ERR_OBJ_TYPE);
5397 		break;
5398 	}
5399 done:
5400 	free(lines);
5401 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5402 	if (s->f && fflush(s->f) != 0 && err == NULL)
5403 		err = got_error_from_errno("fflush");
5404 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5405 		err = got_error_from_errno("fclose");
5406 	return err;
5407 }
5408 
5409 static void
5410 diff_view_indicate_progress(struct tog_view *view)
5411 {
5412 	mvwaddstr(view->window, 0, 0, "diffing...");
5413 	update_panels();
5414 	doupdate();
5415 }
5416 
5417 static const struct got_error *
5418 search_start_diff_view(struct tog_view *view)
5419 {
5420 	struct tog_diff_view_state *s = &view->state.diff;
5421 
5422 	s->matched_line = 0;
5423 	return NULL;
5424 }
5425 
5426 static void
5427 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5428     size_t *nlines, int **first, int **last, int **match, int **selected)
5429 {
5430 	struct tog_diff_view_state *s = &view->state.diff;
5431 
5432 	*f = s->f;
5433 	*nlines = s->nlines;
5434 	*line_offsets = NULL;
5435 	*match = &s->matched_line;
5436 	*first = &s->first_displayed_line;
5437 	*last = &s->last_displayed_line;
5438 	*selected = &s->selected_line;
5439 }
5440 
5441 static const struct got_error *
5442 search_next_view_match(struct tog_view *view)
5443 {
5444 	const struct got_error *err = NULL;
5445 	FILE *f;
5446 	int lineno;
5447 	char *line = NULL;
5448 	size_t linesize = 0;
5449 	ssize_t linelen;
5450 	off_t *line_offsets;
5451 	size_t nlines = 0;
5452 	int *first, *last, *match, *selected;
5453 
5454 	if (!view->search_setup)
5455 		return got_error_msg(GOT_ERR_NOT_IMPL,
5456 		    "view search not supported");
5457 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5458 	    &match, &selected);
5459 
5460 	if (!view->searching) {
5461 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5462 		return NULL;
5463 	}
5464 
5465 	if (*match) {
5466 		if (view->searching == TOG_SEARCH_FORWARD)
5467 			lineno = *first + 1;
5468 		else
5469 			lineno = *first - 1;
5470 	} else
5471 		lineno = *first - 1 + *selected;
5472 
5473 	while (1) {
5474 		off_t offset;
5475 
5476 		if (lineno <= 0 || lineno > nlines) {
5477 			if (*match == 0) {
5478 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5479 				break;
5480 			}
5481 
5482 			if (view->searching == TOG_SEARCH_FORWARD)
5483 				lineno = 1;
5484 			else
5485 				lineno = nlines;
5486 		}
5487 
5488 		offset = view->type == TOG_VIEW_DIFF ?
5489 		    view->state.diff.lines[lineno - 1].offset :
5490 		    line_offsets[lineno - 1];
5491 		if (fseeko(f, offset, SEEK_SET) != 0) {
5492 			free(line);
5493 			return got_error_from_errno("fseeko");
5494 		}
5495 		linelen = getline(&line, &linesize, f);
5496 		if (linelen != -1) {
5497 			char *exstr;
5498 			err = expand_tab(&exstr, line);
5499 			if (err)
5500 				break;
5501 			if (match_line(exstr, &view->regex, 1,
5502 			    &view->regmatch)) {
5503 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5504 				*match = lineno;
5505 				free(exstr);
5506 				break;
5507 			}
5508 			free(exstr);
5509 		}
5510 		if (view->searching == TOG_SEARCH_FORWARD)
5511 			lineno++;
5512 		else
5513 			lineno--;
5514 	}
5515 	free(line);
5516 
5517 	if (*match) {
5518 		*first = *match;
5519 		*selected = 1;
5520 	}
5521 
5522 	return err;
5523 }
5524 
5525 static const struct got_error *
5526 close_diff_view(struct tog_view *view)
5527 {
5528 	const struct got_error *err = NULL;
5529 	struct tog_diff_view_state *s = &view->state.diff;
5530 
5531 	free(s->id1);
5532 	s->id1 = NULL;
5533 	free(s->id2);
5534 	s->id2 = NULL;
5535 	if (s->f && fclose(s->f) == EOF)
5536 		err = got_error_from_errno("fclose");
5537 	s->f = NULL;
5538 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5539 		err = got_error_from_errno("fclose");
5540 	s->f1 = NULL;
5541 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5542 		err = got_error_from_errno("fclose");
5543 	s->f2 = NULL;
5544 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5545 		err = got_error_from_errno("close");
5546 	s->fd1 = -1;
5547 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5548 		err = got_error_from_errno("close");
5549 	s->fd2 = -1;
5550 	free(s->lines);
5551 	s->lines = NULL;
5552 	s->nlines = 0;
5553 	return err;
5554 }
5555 
5556 static const struct got_error *
5557 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5558     struct got_object_id *id2, const char *label1, const char *label2,
5559     int diff_context, int ignore_whitespace, int force_text_diff,
5560     struct tog_view *parent_view, struct got_repository *repo)
5561 {
5562 	const struct got_error *err;
5563 	struct tog_diff_view_state *s = &view->state.diff;
5564 
5565 	memset(s, 0, sizeof(*s));
5566 	s->fd1 = -1;
5567 	s->fd2 = -1;
5568 
5569 	if (id1 != NULL && id2 != NULL) {
5570 		int type1, type2;
5571 
5572 		err = got_object_get_type(&type1, repo, id1);
5573 		if (err)
5574 			goto done;
5575 		err = got_object_get_type(&type2, repo, id2);
5576 		if (err)
5577 			goto done;
5578 
5579 		if (type1 != type2) {
5580 			err = got_error(GOT_ERR_OBJ_TYPE);
5581 			goto done;
5582 		}
5583 	}
5584 	s->first_displayed_line = 1;
5585 	s->last_displayed_line = view->nlines;
5586 	s->selected_line = 1;
5587 	s->repo = repo;
5588 	s->id1 = id1;
5589 	s->id2 = id2;
5590 	s->label1 = label1;
5591 	s->label2 = label2;
5592 
5593 	if (id1) {
5594 		s->id1 = got_object_id_dup(id1);
5595 		if (s->id1 == NULL) {
5596 			err = got_error_from_errno("got_object_id_dup");
5597 			goto done;
5598 		}
5599 	} else
5600 		s->id1 = NULL;
5601 
5602 	s->id2 = got_object_id_dup(id2);
5603 	if (s->id2 == NULL) {
5604 		err = got_error_from_errno("got_object_id_dup");
5605 		goto done;
5606 	}
5607 
5608 	s->f1 = got_opentemp();
5609 	if (s->f1 == NULL) {
5610 		err = got_error_from_errno("got_opentemp");
5611 		goto done;
5612 	}
5613 
5614 	s->f2 = got_opentemp();
5615 	if (s->f2 == NULL) {
5616 		err = got_error_from_errno("got_opentemp");
5617 		goto done;
5618 	}
5619 
5620 	s->fd1 = got_opentempfd();
5621 	if (s->fd1 == -1) {
5622 		err = got_error_from_errno("got_opentempfd");
5623 		goto done;
5624 	}
5625 
5626 	s->fd2 = got_opentempfd();
5627 	if (s->fd2 == -1) {
5628 		err = got_error_from_errno("got_opentempfd");
5629 		goto done;
5630 	}
5631 
5632 	s->diff_context = diff_context;
5633 	s->ignore_whitespace = ignore_whitespace;
5634 	s->force_text_diff = force_text_diff;
5635 	s->parent_view = parent_view;
5636 	s->repo = repo;
5637 
5638 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5639 		int rc;
5640 
5641 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5642 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5643 		if (rc != ERR)
5644 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5645 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5646 		if (rc != ERR)
5647 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5648 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5649 		if (rc != ERR)
5650 			rc = init_pair(GOT_DIFF_LINE_META,
5651 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5652 		if (rc != ERR)
5653 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5654 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5655 		if (rc != ERR)
5656 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5657 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5658 		if (rc != ERR)
5659 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5660 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5661 		if (rc != ERR)
5662 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5663 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5664 		if (rc != ERR)
5665 			rc = init_pair(GOT_DIFF_LINE_DATE,
5666 			    get_color_value("TOG_COLOR_DATE"), -1);
5667 		if (rc == ERR) {
5668 			err = got_error(GOT_ERR_RANGE);
5669 			goto done;
5670 		}
5671 	}
5672 
5673 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5674 	    view_is_splitscreen(view))
5675 		show_log_view(parent_view); /* draw border */
5676 	diff_view_indicate_progress(view);
5677 
5678 	err = create_diff(s);
5679 
5680 	view->show = show_diff_view;
5681 	view->input = input_diff_view;
5682 	view->reset = reset_diff_view;
5683 	view->close = close_diff_view;
5684 	view->search_start = search_start_diff_view;
5685 	view->search_setup = search_setup_diff_view;
5686 	view->search_next = search_next_view_match;
5687 done:
5688 	if (err) {
5689 		if (view->close == NULL)
5690 			close_diff_view(view);
5691 		view_close(view);
5692 	}
5693 	return err;
5694 }
5695 
5696 static const struct got_error *
5697 show_diff_view(struct tog_view *view)
5698 {
5699 	const struct got_error *err;
5700 	struct tog_diff_view_state *s = &view->state.diff;
5701 	char *id_str1 = NULL, *id_str2, *header;
5702 	const char *label1, *label2;
5703 
5704 	if (s->id1) {
5705 		err = got_object_id_str(&id_str1, s->id1);
5706 		if (err)
5707 			return err;
5708 		label1 = s->label1 ? s->label1 : id_str1;
5709 	} else
5710 		label1 = "/dev/null";
5711 
5712 	err = got_object_id_str(&id_str2, s->id2);
5713 	if (err)
5714 		return err;
5715 	label2 = s->label2 ? s->label2 : id_str2;
5716 
5717 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5718 		err = got_error_from_errno("asprintf");
5719 		free(id_str1);
5720 		free(id_str2);
5721 		return err;
5722 	}
5723 	free(id_str1);
5724 	free(id_str2);
5725 
5726 	err = draw_file(view, header);
5727 	free(header);
5728 	return err;
5729 }
5730 
5731 static const struct got_error *
5732 set_selected_commit(struct tog_diff_view_state *s,
5733     struct commit_queue_entry *entry)
5734 {
5735 	const struct got_error *err;
5736 	const struct got_object_id_queue *parent_ids;
5737 	struct got_commit_object *selected_commit;
5738 	struct got_object_qid *pid;
5739 
5740 	free(s->id2);
5741 	s->id2 = got_object_id_dup(entry->id);
5742 	if (s->id2 == NULL)
5743 		return got_error_from_errno("got_object_id_dup");
5744 
5745 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5746 	if (err)
5747 		return err;
5748 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5749 	free(s->id1);
5750 	pid = STAILQ_FIRST(parent_ids);
5751 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5752 	got_object_commit_close(selected_commit);
5753 	return NULL;
5754 }
5755 
5756 static const struct got_error *
5757 reset_diff_view(struct tog_view *view)
5758 {
5759 	struct tog_diff_view_state *s = &view->state.diff;
5760 
5761 	view->count = 0;
5762 	wclear(view->window);
5763 	s->first_displayed_line = 1;
5764 	s->last_displayed_line = view->nlines;
5765 	s->matched_line = 0;
5766 	diff_view_indicate_progress(view);
5767 	return create_diff(s);
5768 }
5769 
5770 static void
5771 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5772 {
5773 	int start, i;
5774 
5775 	i = start = s->first_displayed_line - 1;
5776 
5777 	while (s->lines[i].type != type) {
5778 		if (i == 0)
5779 			i = s->nlines - 1;
5780 		if (--i == start)
5781 			return; /* do nothing, requested type not in file */
5782 	}
5783 
5784 	s->selected_line = 1;
5785 	s->first_displayed_line = i;
5786 }
5787 
5788 static void
5789 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5790 {
5791 	int start, i;
5792 
5793 	i = start = s->first_displayed_line + 1;
5794 
5795 	while (s->lines[i].type != type) {
5796 		if (i == s->nlines - 1)
5797 			i = 0;
5798 		if (++i == start)
5799 			return; /* do nothing, requested type not in file */
5800 	}
5801 
5802 	s->selected_line = 1;
5803 	s->first_displayed_line = i;
5804 }
5805 
5806 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5807     int, int, int);
5808 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5809     int, int);
5810 
5811 static const struct got_error *
5812 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5813 {
5814 	const struct got_error *err = NULL;
5815 	struct tog_diff_view_state *s = &view->state.diff;
5816 	struct tog_log_view_state *ls;
5817 	struct commit_queue_entry *old_selected_entry;
5818 	char *line = NULL;
5819 	size_t linesize = 0;
5820 	ssize_t linelen;
5821 	int i, nscroll = view->nlines - 1, up = 0;
5822 
5823 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5824 
5825 	switch (ch) {
5826 	case '0':
5827 	case '$':
5828 	case KEY_RIGHT:
5829 	case 'l':
5830 	case KEY_LEFT:
5831 	case 'h':
5832 		horizontal_scroll_input(view, ch);
5833 		break;
5834 	case 'a':
5835 	case 'w':
5836 		if (ch == 'a') {
5837 			s->force_text_diff = !s->force_text_diff;
5838 			view->action = s->force_text_diff ?
5839 			    "force ASCII text enabled" :
5840 			    "force ASCII text disabled";
5841 		}
5842 		else if (ch == 'w') {
5843 			s->ignore_whitespace = !s->ignore_whitespace;
5844 			view->action = s->ignore_whitespace ?
5845 			    "ignore whitespace enabled" :
5846 			    "ignore whitespace disabled";
5847 		}
5848 		err = reset_diff_view(view);
5849 		break;
5850 	case 'g':
5851 	case KEY_HOME:
5852 		s->first_displayed_line = 1;
5853 		view->count = 0;
5854 		break;
5855 	case 'G':
5856 	case KEY_END:
5857 		view->count = 0;
5858 		if (s->eof)
5859 			break;
5860 
5861 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5862 		s->eof = 1;
5863 		break;
5864 	case 'k':
5865 	case KEY_UP:
5866 	case CTRL('p'):
5867 		if (s->first_displayed_line > 1)
5868 			s->first_displayed_line--;
5869 		else
5870 			view->count = 0;
5871 		break;
5872 	case CTRL('u'):
5873 	case 'u':
5874 		nscroll /= 2;
5875 		/* FALL THROUGH */
5876 	case KEY_PPAGE:
5877 	case CTRL('b'):
5878 	case 'b':
5879 		if (s->first_displayed_line == 1) {
5880 			view->count = 0;
5881 			break;
5882 		}
5883 		i = 0;
5884 		while (i++ < nscroll && s->first_displayed_line > 1)
5885 			s->first_displayed_line--;
5886 		break;
5887 	case 'j':
5888 	case KEY_DOWN:
5889 	case CTRL('n'):
5890 		if (!s->eof)
5891 			s->first_displayed_line++;
5892 		else
5893 			view->count = 0;
5894 		break;
5895 	case CTRL('d'):
5896 	case 'd':
5897 		nscroll /= 2;
5898 		/* FALL THROUGH */
5899 	case KEY_NPAGE:
5900 	case CTRL('f'):
5901 	case 'f':
5902 	case ' ':
5903 		if (s->eof) {
5904 			view->count = 0;
5905 			break;
5906 		}
5907 		i = 0;
5908 		while (!s->eof && i++ < nscroll) {
5909 			linelen = getline(&line, &linesize, s->f);
5910 			s->first_displayed_line++;
5911 			if (linelen == -1) {
5912 				if (feof(s->f)) {
5913 					s->eof = 1;
5914 				} else
5915 					err = got_ferror(s->f, GOT_ERR_IO);
5916 				break;
5917 			}
5918 		}
5919 		free(line);
5920 		break;
5921 	case '(':
5922 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5923 		break;
5924 	case ')':
5925 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5926 		break;
5927 	case '{':
5928 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5929 		break;
5930 	case '}':
5931 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5932 		break;
5933 	case '[':
5934 		if (s->diff_context > 0) {
5935 			s->diff_context--;
5936 			s->matched_line = 0;
5937 			diff_view_indicate_progress(view);
5938 			err = create_diff(s);
5939 			if (s->first_displayed_line + view->nlines - 1 >
5940 			    s->nlines) {
5941 				s->first_displayed_line = 1;
5942 				s->last_displayed_line = view->nlines;
5943 			}
5944 		} else
5945 			view->count = 0;
5946 		break;
5947 	case ']':
5948 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5949 			s->diff_context++;
5950 			s->matched_line = 0;
5951 			diff_view_indicate_progress(view);
5952 			err = create_diff(s);
5953 		} else
5954 			view->count = 0;
5955 		break;
5956 	case '<':
5957 	case ',':
5958 	case 'K':
5959 		up = 1;
5960 		/* FALL THROUGH */
5961 	case '>':
5962 	case '.':
5963 	case 'J':
5964 		if (s->parent_view == NULL) {
5965 			view->count = 0;
5966 			break;
5967 		}
5968 		s->parent_view->count = view->count;
5969 
5970 		if (s->parent_view->type == TOG_VIEW_LOG) {
5971 			ls = &s->parent_view->state.log;
5972 			old_selected_entry = ls->selected_entry;
5973 
5974 			err = input_log_view(NULL, s->parent_view,
5975 			    up ? KEY_UP : KEY_DOWN);
5976 			if (err)
5977 				break;
5978 			view->count = s->parent_view->count;
5979 
5980 			if (old_selected_entry == ls->selected_entry)
5981 				break;
5982 
5983 			err = set_selected_commit(s, ls->selected_entry);
5984 			if (err)
5985 				break;
5986 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5987 			struct tog_blame_view_state *bs;
5988 			struct got_object_id *id, *prev_id;
5989 
5990 			bs = &s->parent_view->state.blame;
5991 			prev_id = get_annotation_for_line(bs->blame.lines,
5992 			    bs->blame.nlines, bs->last_diffed_line);
5993 
5994 			err = input_blame_view(&view, s->parent_view,
5995 			    up ? KEY_UP : KEY_DOWN);
5996 			if (err)
5997 				break;
5998 			view->count = s->parent_view->count;
5999 
6000 			if (prev_id == NULL)
6001 				break;
6002 			id = get_selected_commit_id(bs->blame.lines,
6003 			    bs->blame.nlines, bs->first_displayed_line,
6004 			    bs->selected_line);
6005 			if (id == NULL)
6006 				break;
6007 
6008 			if (!got_object_id_cmp(prev_id, id))
6009 				break;
6010 
6011 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6012 			if (err)
6013 				break;
6014 		}
6015 		s->first_displayed_line = 1;
6016 		s->last_displayed_line = view->nlines;
6017 		s->matched_line = 0;
6018 		view->x = 0;
6019 
6020 		diff_view_indicate_progress(view);
6021 		err = create_diff(s);
6022 		break;
6023 	default:
6024 		view->count = 0;
6025 		break;
6026 	}
6027 
6028 	return err;
6029 }
6030 
6031 static const struct got_error *
6032 cmd_diff(int argc, char *argv[])
6033 {
6034 	const struct got_error *error;
6035 	struct got_repository *repo = NULL;
6036 	struct got_worktree *worktree = NULL;
6037 	struct got_object_id *id1 = NULL, *id2 = NULL;
6038 	char *repo_path = NULL, *cwd = NULL;
6039 	char *id_str1 = NULL, *id_str2 = NULL;
6040 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6041 	char *label1 = NULL, *label2 = NULL;
6042 	int diff_context = 3, ignore_whitespace = 0;
6043 	int ch, force_text_diff = 0;
6044 	const char *errstr;
6045 	struct tog_view *view;
6046 	int *pack_fds = NULL;
6047 
6048 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6049 		switch (ch) {
6050 		case 'a':
6051 			force_text_diff = 1;
6052 			break;
6053 		case 'C':
6054 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6055 			    &errstr);
6056 			if (errstr != NULL)
6057 				errx(1, "number of context lines is %s: %s",
6058 				    errstr, errstr);
6059 			break;
6060 		case 'r':
6061 			repo_path = realpath(optarg, NULL);
6062 			if (repo_path == NULL)
6063 				return got_error_from_errno2("realpath",
6064 				    optarg);
6065 			got_path_strip_trailing_slashes(repo_path);
6066 			break;
6067 		case 'w':
6068 			ignore_whitespace = 1;
6069 			break;
6070 		default:
6071 			usage_diff();
6072 			/* NOTREACHED */
6073 		}
6074 	}
6075 
6076 	argc -= optind;
6077 	argv += optind;
6078 
6079 	if (argc == 0) {
6080 		usage_diff(); /* TODO show local worktree changes */
6081 	} else if (argc == 2) {
6082 		id_str1 = argv[0];
6083 		id_str2 = argv[1];
6084 	} else
6085 		usage_diff();
6086 
6087 	error = got_repo_pack_fds_open(&pack_fds);
6088 	if (error)
6089 		goto done;
6090 
6091 	if (repo_path == NULL) {
6092 		cwd = getcwd(NULL, 0);
6093 		if (cwd == NULL)
6094 			return got_error_from_errno("getcwd");
6095 		error = got_worktree_open(&worktree, cwd, NULL);
6096 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6097 			goto done;
6098 		if (worktree)
6099 			repo_path =
6100 			    strdup(got_worktree_get_repo_path(worktree));
6101 		else
6102 			repo_path = strdup(cwd);
6103 		if (repo_path == NULL) {
6104 			error = got_error_from_errno("strdup");
6105 			goto done;
6106 		}
6107 	}
6108 
6109 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6110 	if (error)
6111 		goto done;
6112 
6113 	init_curses();
6114 
6115 	error = apply_unveil(got_repo_get_path(repo), NULL);
6116 	if (error)
6117 		goto done;
6118 
6119 	error = tog_load_refs(repo, 0);
6120 	if (error)
6121 		goto done;
6122 
6123 	if (id_str1 != NULL) {
6124 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6125 		    repo, worktree);
6126 		if (error != NULL)
6127 			goto done;
6128 		if (keyword_idstr1 != NULL)
6129 			id_str1 = keyword_idstr1;
6130 	}
6131 	if (id_str2 != NULL) {
6132 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6133 		    repo, worktree);
6134 		if (error != NULL)
6135 			goto done;
6136 		if (keyword_idstr2 != NULL)
6137 			id_str2 = keyword_idstr2;
6138 	}
6139 
6140 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6141 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6142 	if (error)
6143 		goto done;
6144 
6145 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6146 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6147 	if (error)
6148 		goto done;
6149 
6150 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6151 	if (view == NULL) {
6152 		error = got_error_from_errno("view_open");
6153 		goto done;
6154 	}
6155 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6156 	    ignore_whitespace, force_text_diff, NULL,  repo);
6157 	if (error)
6158 		goto done;
6159 
6160 	if (worktree) {
6161 		error = set_tog_base_commit(repo, worktree);
6162 		if (error != NULL)
6163 			goto done;
6164 	}
6165 
6166 	error = view_loop(view);
6167 
6168 done:
6169 	free(tog_base_commit.id);
6170 	free(keyword_idstr1);
6171 	free(keyword_idstr2);
6172 	free(label1);
6173 	free(label2);
6174 	free(repo_path);
6175 	free(cwd);
6176 	if (repo) {
6177 		const struct got_error *close_err = got_repo_close(repo);
6178 		if (error == NULL)
6179 			error = close_err;
6180 	}
6181 	if (worktree)
6182 		got_worktree_close(worktree);
6183 	if (pack_fds) {
6184 		const struct got_error *pack_err =
6185 		    got_repo_pack_fds_close(pack_fds);
6186 		if (error == NULL)
6187 			error = pack_err;
6188 	}
6189 	tog_free_refs();
6190 	return error;
6191 }
6192 
6193 __dead static void
6194 usage_blame(void)
6195 {
6196 	endwin();
6197 	fprintf(stderr,
6198 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6199 	    getprogname());
6200 	exit(1);
6201 }
6202 
6203 struct tog_blame_line {
6204 	int annotated;
6205 	struct got_object_id *id;
6206 };
6207 
6208 static const struct got_error *
6209 draw_blame(struct tog_view *view)
6210 {
6211 	struct tog_blame_view_state *s = &view->state.blame;
6212 	struct tog_blame *blame = &s->blame;
6213 	regmatch_t *regmatch = &view->regmatch;
6214 	const struct got_error *err;
6215 	int lineno = 0, nprinted = 0;
6216 	char *line = NULL;
6217 	size_t linesize = 0;
6218 	ssize_t linelen;
6219 	wchar_t *wline;
6220 	int width;
6221 	struct tog_blame_line *blame_line;
6222 	struct got_object_id *prev_id = NULL;
6223 	char *id_str;
6224 	struct tog_color *tc;
6225 
6226 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6227 	if (err)
6228 		return err;
6229 
6230 	rewind(blame->f);
6231 	werase(view->window);
6232 
6233 	if (asprintf(&line, "commit %s", id_str) == -1) {
6234 		err = got_error_from_errno("asprintf");
6235 		free(id_str);
6236 		return err;
6237 	}
6238 
6239 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6240 	free(line);
6241 	line = NULL;
6242 	if (err)
6243 		return err;
6244 	if (view_needs_focus_indication(view))
6245 		wstandout(view->window);
6246 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6247 	if (tc)
6248 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6249 	waddwstr(view->window, wline);
6250 	while (width++ < view->ncols)
6251 		waddch(view->window, ' ');
6252 	if (tc)
6253 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6254 	if (view_needs_focus_indication(view))
6255 		wstandend(view->window);
6256 	free(wline);
6257 	wline = NULL;
6258 
6259 	if (view->gline > blame->nlines)
6260 		view->gline = blame->nlines;
6261 
6262 	if (tog_io.wait_for_ui) {
6263 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6264 		int rc;
6265 
6266 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6267 		if (rc)
6268 			return got_error_set_errno(rc, "pthread_cond_wait");
6269 		tog_io.wait_for_ui = 0;
6270 	}
6271 
6272 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6273 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6274 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6275 		free(id_str);
6276 		return got_error_from_errno("asprintf");
6277 	}
6278 	free(id_str);
6279 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6280 	free(line);
6281 	line = NULL;
6282 	if (err)
6283 		return err;
6284 	waddwstr(view->window, wline);
6285 	free(wline);
6286 	wline = NULL;
6287 	if (width < view->ncols - 1)
6288 		waddch(view->window, '\n');
6289 
6290 	s->eof = 0;
6291 	view->maxx = 0;
6292 	while (nprinted < view->nlines - 2) {
6293 		linelen = getline(&line, &linesize, blame->f);
6294 		if (linelen == -1) {
6295 			if (feof(blame->f)) {
6296 				s->eof = 1;
6297 				break;
6298 			}
6299 			free(line);
6300 			return got_ferror(blame->f, GOT_ERR_IO);
6301 		}
6302 		if (++lineno < s->first_displayed_line)
6303 			continue;
6304 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6305 			continue;
6306 
6307 		/* Set view->maxx based on full line length. */
6308 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6309 		if (err) {
6310 			free(line);
6311 			return err;
6312 		}
6313 		free(wline);
6314 		wline = NULL;
6315 		view->maxx = MAX(view->maxx, width);
6316 
6317 		if (nprinted == s->selected_line - 1)
6318 			wstandout(view->window);
6319 
6320 		if (blame->nlines > 0) {
6321 			blame_line = &blame->lines[lineno - 1];
6322 			if (blame_line->annotated && prev_id &&
6323 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6324 			    !(nprinted == s->selected_line - 1)) {
6325 				waddstr(view->window, "        ");
6326 			} else if (blame_line->annotated) {
6327 				char *id_str;
6328 				err = got_object_id_str(&id_str,
6329 				    blame_line->id);
6330 				if (err) {
6331 					free(line);
6332 					return err;
6333 				}
6334 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6335 				if (tc)
6336 					wattr_on(view->window,
6337 					    COLOR_PAIR(tc->colorpair), NULL);
6338 				wprintw(view->window, "%.8s", id_str);
6339 				if (tc)
6340 					wattr_off(view->window,
6341 					    COLOR_PAIR(tc->colorpair), NULL);
6342 				free(id_str);
6343 				prev_id = blame_line->id;
6344 			} else {
6345 				waddstr(view->window, "........");
6346 				prev_id = NULL;
6347 			}
6348 		} else {
6349 			waddstr(view->window, "........");
6350 			prev_id = NULL;
6351 		}
6352 
6353 		if (nprinted == s->selected_line - 1)
6354 			wstandend(view->window);
6355 		waddstr(view->window, " ");
6356 
6357 		if (view->ncols <= 9) {
6358 			width = 9;
6359 		} else if (s->first_displayed_line + nprinted ==
6360 		    s->matched_line &&
6361 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6362 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6363 			    view->window, view->x, regmatch);
6364 			if (err) {
6365 				free(line);
6366 				return err;
6367 			}
6368 			width += 9;
6369 		} else {
6370 			int skip;
6371 			err = format_line(&wline, &width, &skip, line,
6372 			    view->x, view->ncols - 9, 9, 1);
6373 			if (err) {
6374 				free(line);
6375 				return err;
6376 			}
6377 			waddwstr(view->window, &wline[skip]);
6378 			width += 9;
6379 			free(wline);
6380 			wline = NULL;
6381 		}
6382 
6383 		if (width <= view->ncols - 1)
6384 			waddch(view->window, '\n');
6385 		if (++nprinted == 1)
6386 			s->first_displayed_line = lineno;
6387 	}
6388 	free(line);
6389 	s->last_displayed_line = lineno;
6390 
6391 	view_border(view);
6392 
6393 	return NULL;
6394 }
6395 
6396 static const struct got_error *
6397 blame_cb(void *arg, int nlines, int lineno,
6398     struct got_commit_object *commit, struct got_object_id *id)
6399 {
6400 	const struct got_error *err = NULL;
6401 	struct tog_blame_cb_args *a = arg;
6402 	struct tog_blame_line *line;
6403 	int errcode;
6404 
6405 	if (nlines != a->nlines ||
6406 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6407 		return got_error(GOT_ERR_RANGE);
6408 
6409 	errcode = pthread_mutex_lock(&tog_mutex);
6410 	if (errcode)
6411 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6412 
6413 	if (*a->quit) {	/* user has quit the blame view */
6414 		err = got_error(GOT_ERR_ITER_COMPLETED);
6415 		goto done;
6416 	}
6417 
6418 	if (lineno == -1)
6419 		goto done; /* no change in this commit */
6420 
6421 	line = &a->lines[lineno - 1];
6422 	if (line->annotated)
6423 		goto done;
6424 
6425 	line->id = got_object_id_dup(id);
6426 	if (line->id == NULL) {
6427 		err = got_error_from_errno("got_object_id_dup");
6428 		goto done;
6429 	}
6430 	line->annotated = 1;
6431 done:
6432 	errcode = pthread_mutex_unlock(&tog_mutex);
6433 	if (errcode)
6434 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6435 	return err;
6436 }
6437 
6438 static void *
6439 blame_thread(void *arg)
6440 {
6441 	const struct got_error *err, *close_err;
6442 	struct tog_blame_thread_args *ta = arg;
6443 	struct tog_blame_cb_args *a = ta->cb_args;
6444 	int errcode, fd1 = -1, fd2 = -1;
6445 	FILE *f1 = NULL, *f2 = NULL;
6446 
6447 	fd1 = got_opentempfd();
6448 	if (fd1 == -1)
6449 		return (void *)got_error_from_errno("got_opentempfd");
6450 
6451 	fd2 = got_opentempfd();
6452 	if (fd2 == -1) {
6453 		err = got_error_from_errno("got_opentempfd");
6454 		goto done;
6455 	}
6456 
6457 	f1 = got_opentemp();
6458 	if (f1 == NULL) {
6459 		err = (void *)got_error_from_errno("got_opentemp");
6460 		goto done;
6461 	}
6462 	f2 = got_opentemp();
6463 	if (f2 == NULL) {
6464 		err = (void *)got_error_from_errno("got_opentemp");
6465 		goto done;
6466 	}
6467 
6468 	err = block_signals_used_by_main_thread();
6469 	if (err)
6470 		goto done;
6471 
6472 	err = got_blame(ta->path, a->commit_id, ta->repo,
6473 	    tog_diff_algo, blame_cb, ta->cb_args,
6474 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6475 	if (err && err->code == GOT_ERR_CANCELLED)
6476 		err = NULL;
6477 
6478 	errcode = pthread_mutex_lock(&tog_mutex);
6479 	if (errcode) {
6480 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6481 		goto done;
6482 	}
6483 
6484 	close_err = got_repo_close(ta->repo);
6485 	if (err == NULL)
6486 		err = close_err;
6487 	ta->repo = NULL;
6488 	*ta->complete = 1;
6489 
6490 	if (tog_io.wait_for_ui) {
6491 		errcode = pthread_cond_signal(&ta->blame_complete);
6492 		if (errcode && err == NULL)
6493 			err = got_error_set_errno(errcode,
6494 			    "pthread_cond_signal");
6495 	}
6496 
6497 	errcode = pthread_mutex_unlock(&tog_mutex);
6498 	if (errcode && err == NULL)
6499 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6500 
6501 done:
6502 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6503 		err = got_error_from_errno("close");
6504 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6505 		err = got_error_from_errno("close");
6506 	if (f1 && fclose(f1) == EOF && err == NULL)
6507 		err = got_error_from_errno("fclose");
6508 	if (f2 && fclose(f2) == EOF && err == NULL)
6509 		err = got_error_from_errno("fclose");
6510 
6511 	return (void *)err;
6512 }
6513 
6514 static struct got_object_id *
6515 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6516     int first_displayed_line, int selected_line)
6517 {
6518 	struct tog_blame_line *line;
6519 
6520 	if (nlines <= 0)
6521 		return NULL;
6522 
6523 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6524 	if (!line->annotated)
6525 		return NULL;
6526 
6527 	return line->id;
6528 }
6529 
6530 static struct got_object_id *
6531 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6532     int lineno)
6533 {
6534 	struct tog_blame_line *line;
6535 
6536 	if (nlines <= 0 || lineno >= nlines)
6537 		return NULL;
6538 
6539 	line = &lines[lineno - 1];
6540 	if (!line->annotated)
6541 		return NULL;
6542 
6543 	return line->id;
6544 }
6545 
6546 static const struct got_error *
6547 stop_blame(struct tog_blame *blame)
6548 {
6549 	const struct got_error *err = NULL;
6550 	int i;
6551 
6552 	if (blame->thread) {
6553 		int errcode;
6554 		errcode = pthread_mutex_unlock(&tog_mutex);
6555 		if (errcode)
6556 			return got_error_set_errno(errcode,
6557 			    "pthread_mutex_unlock");
6558 		errcode = pthread_join(blame->thread, (void **)&err);
6559 		if (errcode)
6560 			return got_error_set_errno(errcode, "pthread_join");
6561 		errcode = pthread_mutex_lock(&tog_mutex);
6562 		if (errcode)
6563 			return got_error_set_errno(errcode,
6564 			    "pthread_mutex_lock");
6565 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6566 			err = NULL;
6567 		blame->thread = 0; //NULL;
6568 	}
6569 	if (blame->thread_args.repo) {
6570 		const struct got_error *close_err;
6571 		close_err = got_repo_close(blame->thread_args.repo);
6572 		if (err == NULL)
6573 			err = close_err;
6574 		blame->thread_args.repo = NULL;
6575 	}
6576 	if (blame->f) {
6577 		if (fclose(blame->f) == EOF && err == NULL)
6578 			err = got_error_from_errno("fclose");
6579 		blame->f = NULL;
6580 	}
6581 	if (blame->lines) {
6582 		for (i = 0; i < blame->nlines; i++)
6583 			free(blame->lines[i].id);
6584 		free(blame->lines);
6585 		blame->lines = NULL;
6586 	}
6587 	free(blame->cb_args.commit_id);
6588 	blame->cb_args.commit_id = NULL;
6589 	if (blame->pack_fds) {
6590 		const struct got_error *pack_err =
6591 		    got_repo_pack_fds_close(blame->pack_fds);
6592 		if (err == NULL)
6593 			err = pack_err;
6594 		blame->pack_fds = NULL;
6595 	}
6596 	return err;
6597 }
6598 
6599 static const struct got_error *
6600 cancel_blame_view(void *arg)
6601 {
6602 	const struct got_error *err = NULL;
6603 	int *done = arg;
6604 	int errcode;
6605 
6606 	errcode = pthread_mutex_lock(&tog_mutex);
6607 	if (errcode)
6608 		return got_error_set_errno(errcode,
6609 		    "pthread_mutex_unlock");
6610 
6611 	if (*done)
6612 		err = got_error(GOT_ERR_CANCELLED);
6613 
6614 	errcode = pthread_mutex_unlock(&tog_mutex);
6615 	if (errcode)
6616 		return got_error_set_errno(errcode,
6617 		    "pthread_mutex_lock");
6618 
6619 	return err;
6620 }
6621 
6622 static const struct got_error *
6623 run_blame(struct tog_view *view)
6624 {
6625 	struct tog_blame_view_state *s = &view->state.blame;
6626 	struct tog_blame *blame = &s->blame;
6627 	const struct got_error *err = NULL;
6628 	struct got_commit_object *commit = NULL;
6629 	struct got_blob_object *blob = NULL;
6630 	struct got_repository *thread_repo = NULL;
6631 	struct got_object_id *obj_id = NULL;
6632 	int obj_type, fd = -1;
6633 	int *pack_fds = NULL;
6634 
6635 	err = got_object_open_as_commit(&commit, s->repo,
6636 	    &s->blamed_commit->id);
6637 	if (err)
6638 		return err;
6639 
6640 	fd = got_opentempfd();
6641 	if (fd == -1) {
6642 		err = got_error_from_errno("got_opentempfd");
6643 		goto done;
6644 	}
6645 
6646 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6647 	if (err)
6648 		goto done;
6649 
6650 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6651 	if (err)
6652 		goto done;
6653 
6654 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6655 		err = got_error(GOT_ERR_OBJ_TYPE);
6656 		goto done;
6657 	}
6658 
6659 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6660 	if (err)
6661 		goto done;
6662 	blame->f = got_opentemp();
6663 	if (blame->f == NULL) {
6664 		err = got_error_from_errno("got_opentemp");
6665 		goto done;
6666 	}
6667 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6668 	    &blame->line_offsets, blame->f, blob);
6669 	if (err)
6670 		goto done;
6671 	if (blame->nlines == 0) {
6672 		s->blame_complete = 1;
6673 		goto done;
6674 	}
6675 
6676 	/* Don't include \n at EOF in the blame line count. */
6677 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6678 		blame->nlines--;
6679 
6680 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6681 	if (blame->lines == NULL) {
6682 		err = got_error_from_errno("calloc");
6683 		goto done;
6684 	}
6685 
6686 	err = got_repo_pack_fds_open(&pack_fds);
6687 	if (err)
6688 		goto done;
6689 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6690 	    pack_fds);
6691 	if (err)
6692 		goto done;
6693 
6694 	blame->pack_fds = pack_fds;
6695 	blame->cb_args.view = view;
6696 	blame->cb_args.lines = blame->lines;
6697 	blame->cb_args.nlines = blame->nlines;
6698 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6699 	if (blame->cb_args.commit_id == NULL) {
6700 		err = got_error_from_errno("got_object_id_dup");
6701 		goto done;
6702 	}
6703 	blame->cb_args.quit = &s->done;
6704 
6705 	blame->thread_args.path = s->path;
6706 	blame->thread_args.repo = thread_repo;
6707 	blame->thread_args.cb_args = &blame->cb_args;
6708 	blame->thread_args.complete = &s->blame_complete;
6709 	blame->thread_args.cancel_cb = cancel_blame_view;
6710 	blame->thread_args.cancel_arg = &s->done;
6711 	s->blame_complete = 0;
6712 
6713 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6714 		s->first_displayed_line = 1;
6715 		s->last_displayed_line = view->nlines;
6716 		s->selected_line = 1;
6717 	}
6718 	s->matched_line = 0;
6719 
6720 done:
6721 	if (commit)
6722 		got_object_commit_close(commit);
6723 	if (fd != -1 && close(fd) == -1 && err == NULL)
6724 		err = got_error_from_errno("close");
6725 	if (blob)
6726 		got_object_blob_close(blob);
6727 	free(obj_id);
6728 	if (err)
6729 		stop_blame(blame);
6730 	return err;
6731 }
6732 
6733 static const struct got_error *
6734 open_blame_view(struct tog_view *view, char *path,
6735     struct got_object_id *commit_id, struct got_repository *repo)
6736 {
6737 	const struct got_error *err = NULL;
6738 	struct tog_blame_view_state *s = &view->state.blame;
6739 
6740 	STAILQ_INIT(&s->blamed_commits);
6741 
6742 	s->path = strdup(path);
6743 	if (s->path == NULL)
6744 		return got_error_from_errno("strdup");
6745 
6746 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6747 	if (err) {
6748 		free(s->path);
6749 		return err;
6750 	}
6751 
6752 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6753 	s->first_displayed_line = 1;
6754 	s->last_displayed_line = view->nlines;
6755 	s->selected_line = 1;
6756 	s->blame_complete = 0;
6757 	s->repo = repo;
6758 	s->commit_id = commit_id;
6759 	memset(&s->blame, 0, sizeof(s->blame));
6760 
6761 	STAILQ_INIT(&s->colors);
6762 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6763 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6764 		    get_color_value("TOG_COLOR_COMMIT"));
6765 		if (err)
6766 			return err;
6767 	}
6768 
6769 	view->show = show_blame_view;
6770 	view->input = input_blame_view;
6771 	view->reset = reset_blame_view;
6772 	view->close = close_blame_view;
6773 	view->search_start = search_start_blame_view;
6774 	view->search_setup = search_setup_blame_view;
6775 	view->search_next = search_next_view_match;
6776 
6777 	if (using_mock_io) {
6778 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6779 		int rc;
6780 
6781 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6782 		if (rc)
6783 			return got_error_set_errno(rc, "pthread_cond_init");
6784 	}
6785 
6786 	return run_blame(view);
6787 }
6788 
6789 static const struct got_error *
6790 close_blame_view(struct tog_view *view)
6791 {
6792 	const struct got_error *err = NULL;
6793 	struct tog_blame_view_state *s = &view->state.blame;
6794 
6795 	if (s->blame.thread)
6796 		err = stop_blame(&s->blame);
6797 
6798 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6799 		struct got_object_qid *blamed_commit;
6800 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6801 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6802 		got_object_qid_free(blamed_commit);
6803 	}
6804 
6805 	if (using_mock_io) {
6806 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6807 		int rc;
6808 
6809 		rc = pthread_cond_destroy(&bta->blame_complete);
6810 		if (rc && err == NULL)
6811 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6812 	}
6813 
6814 	free(s->path);
6815 	free_colors(&s->colors);
6816 	return err;
6817 }
6818 
6819 static const struct got_error *
6820 search_start_blame_view(struct tog_view *view)
6821 {
6822 	struct tog_blame_view_state *s = &view->state.blame;
6823 
6824 	s->matched_line = 0;
6825 	return NULL;
6826 }
6827 
6828 static void
6829 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6830     size_t *nlines, int **first, int **last, int **match, int **selected)
6831 {
6832 	struct tog_blame_view_state *s = &view->state.blame;
6833 
6834 	*f = s->blame.f;
6835 	*nlines = s->blame.nlines;
6836 	*line_offsets = s->blame.line_offsets;
6837 	*match = &s->matched_line;
6838 	*first = &s->first_displayed_line;
6839 	*last = &s->last_displayed_line;
6840 	*selected = &s->selected_line;
6841 }
6842 
6843 static const struct got_error *
6844 show_blame_view(struct tog_view *view)
6845 {
6846 	const struct got_error *err = NULL;
6847 	struct tog_blame_view_state *s = &view->state.blame;
6848 	int errcode;
6849 
6850 	if (s->blame.thread == 0 && !s->blame_complete) {
6851 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6852 		    &s->blame.thread_args);
6853 		if (errcode)
6854 			return got_error_set_errno(errcode, "pthread_create");
6855 
6856 		if (!using_mock_io)
6857 			halfdelay(1); /* fast refresh while annotating  */
6858 	}
6859 
6860 	if (s->blame_complete && !using_mock_io)
6861 		halfdelay(10); /* disable fast refresh */
6862 
6863 	err = draw_blame(view);
6864 
6865 	view_border(view);
6866 	return err;
6867 }
6868 
6869 static const struct got_error *
6870 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6871     struct got_repository *repo, struct got_object_id *id)
6872 {
6873 	struct tog_view		*log_view;
6874 	const struct got_error	*err = NULL;
6875 
6876 	*new_view = NULL;
6877 
6878 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6879 	if (log_view == NULL)
6880 		return got_error_from_errno("view_open");
6881 
6882 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6883 	if (err)
6884 		view_close(log_view);
6885 	else
6886 		*new_view = log_view;
6887 
6888 	return err;
6889 }
6890 
6891 static const struct got_error *
6892 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6893 {
6894 	const struct got_error *err = NULL, *thread_err = NULL;
6895 	struct tog_view *diff_view;
6896 	struct tog_blame_view_state *s = &view->state.blame;
6897 	int eos, nscroll, begin_y = 0, begin_x = 0;
6898 
6899 	eos = nscroll = view->nlines - 2;
6900 	if (view_is_hsplit_top(view))
6901 		--eos;  /* border */
6902 
6903 	switch (ch) {
6904 	case '0':
6905 	case '$':
6906 	case KEY_RIGHT:
6907 	case 'l':
6908 	case KEY_LEFT:
6909 	case 'h':
6910 		horizontal_scroll_input(view, ch);
6911 		break;
6912 	case 'q':
6913 		s->done = 1;
6914 		break;
6915 	case 'g':
6916 	case KEY_HOME:
6917 		s->selected_line = 1;
6918 		s->first_displayed_line = 1;
6919 		view->count = 0;
6920 		break;
6921 	case 'G':
6922 	case KEY_END:
6923 		if (s->blame.nlines < eos) {
6924 			s->selected_line = s->blame.nlines;
6925 			s->first_displayed_line = 1;
6926 		} else {
6927 			s->selected_line = eos;
6928 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6929 		}
6930 		view->count = 0;
6931 		break;
6932 	case 'k':
6933 	case KEY_UP:
6934 	case CTRL('p'):
6935 		if (s->selected_line > 1)
6936 			s->selected_line--;
6937 		else if (s->selected_line == 1 &&
6938 		    s->first_displayed_line > 1)
6939 			s->first_displayed_line--;
6940 		else
6941 			view->count = 0;
6942 		break;
6943 	case CTRL('u'):
6944 	case 'u':
6945 		nscroll /= 2;
6946 		/* FALL THROUGH */
6947 	case KEY_PPAGE:
6948 	case CTRL('b'):
6949 	case 'b':
6950 		if (s->first_displayed_line == 1) {
6951 			if (view->count > 1)
6952 				nscroll += nscroll;
6953 			s->selected_line = MAX(1, s->selected_line - nscroll);
6954 			view->count = 0;
6955 			break;
6956 		}
6957 		if (s->first_displayed_line > nscroll)
6958 			s->first_displayed_line -= nscroll;
6959 		else
6960 			s->first_displayed_line = 1;
6961 		break;
6962 	case 'j':
6963 	case KEY_DOWN:
6964 	case CTRL('n'):
6965 		if (s->selected_line < eos && s->first_displayed_line +
6966 		    s->selected_line <= s->blame.nlines)
6967 			s->selected_line++;
6968 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6969 			s->first_displayed_line++;
6970 		else
6971 			view->count = 0;
6972 		break;
6973 	case 'c':
6974 	case 'p': {
6975 		struct got_object_id *id = NULL;
6976 
6977 		view->count = 0;
6978 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6979 		    s->first_displayed_line, s->selected_line);
6980 		if (id == NULL)
6981 			break;
6982 		if (ch == 'p') {
6983 			struct got_commit_object *commit, *pcommit;
6984 			struct got_object_qid *pid;
6985 			struct got_object_id *blob_id = NULL;
6986 			int obj_type;
6987 			err = got_object_open_as_commit(&commit,
6988 			    s->repo, id);
6989 			if (err)
6990 				break;
6991 			pid = STAILQ_FIRST(
6992 			    got_object_commit_get_parent_ids(commit));
6993 			if (pid == NULL) {
6994 				got_object_commit_close(commit);
6995 				break;
6996 			}
6997 			/* Check if path history ends here. */
6998 			err = got_object_open_as_commit(&pcommit,
6999 			    s->repo, &pid->id);
7000 			if (err)
7001 				break;
7002 			err = got_object_id_by_path(&blob_id, s->repo,
7003 			    pcommit, s->path);
7004 			got_object_commit_close(pcommit);
7005 			if (err) {
7006 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7007 					err = NULL;
7008 				got_object_commit_close(commit);
7009 				break;
7010 			}
7011 			err = got_object_get_type(&obj_type, s->repo,
7012 			    blob_id);
7013 			free(blob_id);
7014 			/* Can't blame non-blob type objects. */
7015 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7016 				got_object_commit_close(commit);
7017 				break;
7018 			}
7019 			err = got_object_qid_alloc(&s->blamed_commit,
7020 			    &pid->id);
7021 			got_object_commit_close(commit);
7022 		} else {
7023 			if (got_object_id_cmp(id,
7024 			    &s->blamed_commit->id) == 0)
7025 				break;
7026 			err = got_object_qid_alloc(&s->blamed_commit,
7027 			    id);
7028 		}
7029 		if (err)
7030 			break;
7031 		s->done = 1;
7032 		thread_err = stop_blame(&s->blame);
7033 		s->done = 0;
7034 		if (thread_err)
7035 			break;
7036 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7037 		    s->blamed_commit, entry);
7038 		err = run_blame(view);
7039 		if (err)
7040 			break;
7041 		break;
7042 	}
7043 	case 'C': {
7044 		struct got_object_qid *first;
7045 
7046 		view->count = 0;
7047 		first = STAILQ_FIRST(&s->blamed_commits);
7048 		if (!got_object_id_cmp(&first->id, s->commit_id))
7049 			break;
7050 		s->done = 1;
7051 		thread_err = stop_blame(&s->blame);
7052 		s->done = 0;
7053 		if (thread_err)
7054 			break;
7055 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7056 		got_object_qid_free(s->blamed_commit);
7057 		s->blamed_commit =
7058 		    STAILQ_FIRST(&s->blamed_commits);
7059 		err = run_blame(view);
7060 		if (err)
7061 			break;
7062 		break;
7063 	}
7064 	case 'L':
7065 		view->count = 0;
7066 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7067 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7068 		if (s->id_to_log)
7069 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7070 		break;
7071 	case KEY_ENTER:
7072 	case '\r': {
7073 		struct got_object_id *id = NULL;
7074 		struct got_object_qid *pid;
7075 		struct got_commit_object *commit = NULL;
7076 
7077 		view->count = 0;
7078 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7079 		    s->first_displayed_line, s->selected_line);
7080 		if (id == NULL)
7081 			break;
7082 		err = got_object_open_as_commit(&commit, s->repo, id);
7083 		if (err)
7084 			break;
7085 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7086 		if (*new_view) {
7087 			/* traversed from diff view, release diff resources  */
7088 			err = close_diff_view(*new_view);
7089 			if (err)
7090 				break;
7091 			diff_view = *new_view;
7092 		} else {
7093 			if (view_is_parent_view(view))
7094 				view_get_split(view, &begin_y, &begin_x);
7095 
7096 			diff_view = view_open(0, 0, begin_y, begin_x,
7097 			    TOG_VIEW_DIFF);
7098 			if (diff_view == NULL) {
7099 				got_object_commit_close(commit);
7100 				err = got_error_from_errno("view_open");
7101 				break;
7102 			}
7103 		}
7104 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7105 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7106 		got_object_commit_close(commit);
7107 		if (err)
7108 			break;
7109 		s->last_diffed_line = s->first_displayed_line - 1 +
7110 		    s->selected_line;
7111 		if (*new_view)
7112 			break;	/* still open from active diff view */
7113 		if (view_is_parent_view(view) &&
7114 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7115 			err = view_init_hsplit(view, begin_y);
7116 			if (err)
7117 				break;
7118 		}
7119 
7120 		view->focussed = 0;
7121 		diff_view->focussed = 1;
7122 		diff_view->mode = view->mode;
7123 		diff_view->nlines = view->lines - begin_y;
7124 		if (view_is_parent_view(view)) {
7125 			view_transfer_size(diff_view, view);
7126 			err = view_close_child(view);
7127 			if (err)
7128 				break;
7129 			err = view_set_child(view, diff_view);
7130 			if (err)
7131 				break;
7132 			view->focus_child = 1;
7133 		} else
7134 			*new_view = diff_view;
7135 		if (err)
7136 			break;
7137 		break;
7138 	}
7139 	case CTRL('d'):
7140 	case 'd':
7141 		nscroll /= 2;
7142 		/* FALL THROUGH */
7143 	case KEY_NPAGE:
7144 	case CTRL('f'):
7145 	case 'f':
7146 	case ' ':
7147 		if (s->last_displayed_line >= s->blame.nlines &&
7148 		    s->selected_line >= MIN(s->blame.nlines,
7149 		    view->nlines - 2)) {
7150 			view->count = 0;
7151 			break;
7152 		}
7153 		if (s->last_displayed_line >= s->blame.nlines &&
7154 		    s->selected_line < view->nlines - 2) {
7155 			s->selected_line +=
7156 			    MIN(nscroll, s->last_displayed_line -
7157 			    s->first_displayed_line - s->selected_line + 1);
7158 		}
7159 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7160 			s->first_displayed_line += nscroll;
7161 		else
7162 			s->first_displayed_line =
7163 			    s->blame.nlines - (view->nlines - 3);
7164 		break;
7165 	case KEY_RESIZE:
7166 		if (s->selected_line > view->nlines - 2) {
7167 			s->selected_line = MIN(s->blame.nlines,
7168 			    view->nlines - 2);
7169 		}
7170 		break;
7171 	default:
7172 		view->count = 0;
7173 		break;
7174 	}
7175 	return thread_err ? thread_err : err;
7176 }
7177 
7178 static const struct got_error *
7179 reset_blame_view(struct tog_view *view)
7180 {
7181 	const struct got_error *err;
7182 	struct tog_blame_view_state *s = &view->state.blame;
7183 
7184 	view->count = 0;
7185 	s->done = 1;
7186 	err = stop_blame(&s->blame);
7187 	s->done = 0;
7188 	if (err)
7189 		return err;
7190 	return run_blame(view);
7191 }
7192 
7193 static const struct got_error *
7194 cmd_blame(int argc, char *argv[])
7195 {
7196 	const struct got_error *error;
7197 	struct got_repository *repo = NULL;
7198 	struct got_worktree *worktree = NULL;
7199 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7200 	char *link_target = NULL;
7201 	struct got_object_id *commit_id = NULL;
7202 	struct got_commit_object *commit = NULL;
7203 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7204 	int ch;
7205 	struct tog_view *view = NULL;
7206 	int *pack_fds = NULL;
7207 
7208 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7209 		switch (ch) {
7210 		case 'c':
7211 			commit_id_str = optarg;
7212 			break;
7213 		case 'r':
7214 			repo_path = realpath(optarg, NULL);
7215 			if (repo_path == NULL)
7216 				return got_error_from_errno2("realpath",
7217 				    optarg);
7218 			break;
7219 		default:
7220 			usage_blame();
7221 			/* NOTREACHED */
7222 		}
7223 	}
7224 
7225 	argc -= optind;
7226 	argv += optind;
7227 
7228 	if (argc != 1)
7229 		usage_blame();
7230 
7231 	error = got_repo_pack_fds_open(&pack_fds);
7232 	if (error != NULL)
7233 		goto done;
7234 
7235 	if (repo_path == NULL) {
7236 		cwd = getcwd(NULL, 0);
7237 		if (cwd == NULL)
7238 			return got_error_from_errno("getcwd");
7239 		error = got_worktree_open(&worktree, cwd, NULL);
7240 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7241 			goto done;
7242 		if (worktree)
7243 			repo_path =
7244 			    strdup(got_worktree_get_repo_path(worktree));
7245 		else
7246 			repo_path = strdup(cwd);
7247 		if (repo_path == NULL) {
7248 			error = got_error_from_errno("strdup");
7249 			goto done;
7250 		}
7251 	}
7252 
7253 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7254 	if (error != NULL)
7255 		goto done;
7256 
7257 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7258 	    worktree);
7259 	if (error)
7260 		goto done;
7261 
7262 	init_curses();
7263 
7264 	error = apply_unveil(got_repo_get_path(repo), NULL);
7265 	if (error)
7266 		goto done;
7267 
7268 	error = tog_load_refs(repo, 0);
7269 	if (error)
7270 		goto done;
7271 
7272 	if (commit_id_str == NULL) {
7273 		struct got_reference *head_ref;
7274 		error = got_ref_open(&head_ref, repo, worktree ?
7275 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7276 		if (error != NULL)
7277 			goto done;
7278 		error = got_ref_resolve(&commit_id, repo, head_ref);
7279 		got_ref_close(head_ref);
7280 	} else {
7281 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7282 		    repo, worktree);
7283 		if (error != NULL)
7284 			goto done;
7285 		if (keyword_idstr != NULL)
7286 			commit_id_str = keyword_idstr;
7287 
7288 		error = got_repo_match_object_id(&commit_id, NULL,
7289 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7290 	}
7291 	if (error != NULL)
7292 		goto done;
7293 
7294 	error = got_object_open_as_commit(&commit, repo, commit_id);
7295 	if (error)
7296 		goto done;
7297 
7298 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7299 	    commit, repo);
7300 	if (error)
7301 		goto done;
7302 
7303 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7304 	if (view == NULL) {
7305 		error = got_error_from_errno("view_open");
7306 		goto done;
7307 	}
7308 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7309 	    commit_id, repo);
7310 	if (error != NULL) {
7311 		if (view->close == NULL)
7312 			close_blame_view(view);
7313 		view_close(view);
7314 		goto done;
7315 	}
7316 
7317 	if (worktree) {
7318 		error = set_tog_base_commit(repo, worktree);
7319 		if (error != NULL)
7320 			goto done;
7321 
7322 		/* Release work tree lock. */
7323 		got_worktree_close(worktree);
7324 		worktree = NULL;
7325 	}
7326 
7327 	error = view_loop(view);
7328 
7329 done:
7330 	free(tog_base_commit.id);
7331 	free(repo_path);
7332 	free(in_repo_path);
7333 	free(link_target);
7334 	free(cwd);
7335 	free(commit_id);
7336 	free(keyword_idstr);
7337 	if (commit)
7338 		got_object_commit_close(commit);
7339 	if (worktree)
7340 		got_worktree_close(worktree);
7341 	if (repo) {
7342 		const struct got_error *close_err = got_repo_close(repo);
7343 		if (error == NULL)
7344 			error = close_err;
7345 	}
7346 	if (pack_fds) {
7347 		const struct got_error *pack_err =
7348 		    got_repo_pack_fds_close(pack_fds);
7349 		if (error == NULL)
7350 			error = pack_err;
7351 	}
7352 	tog_free_refs();
7353 	return error;
7354 }
7355 
7356 static const struct got_error *
7357 draw_tree_entries(struct tog_view *view, const char *parent_path)
7358 {
7359 	struct tog_tree_view_state *s = &view->state.tree;
7360 	const struct got_error *err = NULL;
7361 	struct got_tree_entry *te;
7362 	wchar_t *wline;
7363 	char *index = NULL;
7364 	struct tog_color *tc;
7365 	int width, n, nentries, scrollx, i = 1;
7366 	int limit = view->nlines;
7367 
7368 	s->ndisplayed = 0;
7369 	if (view_is_hsplit_top(view))
7370 		--limit;  /* border */
7371 
7372 	werase(view->window);
7373 
7374 	if (limit == 0)
7375 		return NULL;
7376 
7377 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7378 	    0, 0);
7379 	if (err)
7380 		return err;
7381 	if (view_needs_focus_indication(view))
7382 		wstandout(view->window);
7383 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7384 	if (tc)
7385 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7386 	waddwstr(view->window, wline);
7387 	free(wline);
7388 	wline = NULL;
7389 	while (width++ < view->ncols)
7390 		waddch(view->window, ' ');
7391 	if (tc)
7392 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7393 	if (view_needs_focus_indication(view))
7394 		wstandend(view->window);
7395 	if (--limit <= 0)
7396 		return NULL;
7397 
7398 	i += s->selected;
7399 	if (s->first_displayed_entry) {
7400 		i += got_tree_entry_get_index(s->first_displayed_entry);
7401 		if (s->tree != s->root)
7402 			++i;  /* account for ".." entry */
7403 	}
7404 	nentries = got_object_tree_get_nentries(s->tree);
7405 	if (asprintf(&index, "[%d/%d] %s",
7406 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7407 		return got_error_from_errno("asprintf");
7408 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7409 	free(index);
7410 	if (err)
7411 		return err;
7412 	waddwstr(view->window, wline);
7413 	free(wline);
7414 	wline = NULL;
7415 	if (width < view->ncols - 1)
7416 		waddch(view->window, '\n');
7417 	if (--limit <= 0)
7418 		return NULL;
7419 	waddch(view->window, '\n');
7420 	if (--limit <= 0)
7421 		return NULL;
7422 
7423 	if (s->first_displayed_entry == NULL) {
7424 		te = got_object_tree_get_first_entry(s->tree);
7425 		if (s->selected == 0) {
7426 			if (view->focussed)
7427 				wstandout(view->window);
7428 			s->selected_entry = NULL;
7429 		}
7430 		waddstr(view->window, "  ..\n");	/* parent directory */
7431 		if (s->selected == 0 && view->focussed)
7432 			wstandend(view->window);
7433 		s->ndisplayed++;
7434 		if (--limit <= 0)
7435 			return NULL;
7436 		n = 1;
7437 	} else {
7438 		n = 0;
7439 		te = s->first_displayed_entry;
7440 	}
7441 
7442 	view->maxx = 0;
7443 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7444 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7445 		const char *modestr = "";
7446 		mode_t mode;
7447 
7448 		te = got_object_tree_get_entry(s->tree, i);
7449 		mode = got_tree_entry_get_mode(te);
7450 
7451 		if (s->show_ids) {
7452 			err = got_object_id_str(&id_str,
7453 			    got_tree_entry_get_id(te));
7454 			if (err)
7455 				return got_error_from_errno(
7456 				    "got_object_id_str");
7457 		}
7458 		if (got_object_tree_entry_is_submodule(te))
7459 			modestr = "$";
7460 		else if (S_ISLNK(mode)) {
7461 			int i;
7462 
7463 			err = got_tree_entry_get_symlink_target(&link_target,
7464 			    te, s->repo);
7465 			if (err) {
7466 				free(id_str);
7467 				return err;
7468 			}
7469 			for (i = 0; link_target[i] != '\0'; i++) {
7470 				if (!isprint((unsigned char)link_target[i]))
7471 					link_target[i] = '?';
7472 			}
7473 			modestr = "@";
7474 		}
7475 		else if (S_ISDIR(mode))
7476 			modestr = "/";
7477 		else if (mode & S_IXUSR)
7478 			modestr = "*";
7479 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7480 		    got_tree_entry_get_name(te), modestr,
7481 		    link_target ? " -> ": "",
7482 		    link_target ? link_target : "") == -1) {
7483 			free(id_str);
7484 			free(link_target);
7485 			return got_error_from_errno("asprintf");
7486 		}
7487 		free(id_str);
7488 		free(link_target);
7489 
7490 		/* use full line width to determine view->maxx */
7491 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7492 		if (err) {
7493 			free(line);
7494 			break;
7495 		}
7496 		view->maxx = MAX(view->maxx, width);
7497 		free(wline);
7498 		wline = NULL;
7499 
7500 		err = format_line(&wline, &width, &scrollx, line, view->x,
7501 		    view->ncols, 0, 0);
7502 		if (err) {
7503 			free(line);
7504 			break;
7505 		}
7506 		if (n == s->selected) {
7507 			if (view->focussed)
7508 				wstandout(view->window);
7509 			s->selected_entry = te;
7510 		}
7511 		tc = match_color(&s->colors, line);
7512 		if (tc)
7513 			wattr_on(view->window,
7514 			    COLOR_PAIR(tc->colorpair), NULL);
7515 		waddwstr(view->window, &wline[scrollx]);
7516 		if (tc)
7517 			wattr_off(view->window,
7518 			    COLOR_PAIR(tc->colorpair), NULL);
7519 		if (width < view->ncols)
7520 			waddch(view->window, '\n');
7521 		if (n == s->selected && view->focussed)
7522 			wstandend(view->window);
7523 		free(line);
7524 		free(wline);
7525 		wline = NULL;
7526 		n++;
7527 		s->ndisplayed++;
7528 		s->last_displayed_entry = te;
7529 		if (--limit <= 0)
7530 			break;
7531 	}
7532 
7533 	return err;
7534 }
7535 
7536 static void
7537 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7538 {
7539 	struct got_tree_entry *te;
7540 	int isroot = s->tree == s->root;
7541 	int i = 0;
7542 
7543 	if (s->first_displayed_entry == NULL)
7544 		return;
7545 
7546 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7547 	while (i++ < maxscroll) {
7548 		if (te == NULL) {
7549 			if (!isroot)
7550 				s->first_displayed_entry = NULL;
7551 			break;
7552 		}
7553 		s->first_displayed_entry = te;
7554 		te = got_tree_entry_get_prev(s->tree, te);
7555 	}
7556 }
7557 
7558 static const struct got_error *
7559 tree_scroll_down(struct tog_view *view, int maxscroll)
7560 {
7561 	struct tog_tree_view_state *s = &view->state.tree;
7562 	struct got_tree_entry *next, *last;
7563 	int n = 0;
7564 
7565 	if (s->first_displayed_entry)
7566 		next = got_tree_entry_get_next(s->tree,
7567 		    s->first_displayed_entry);
7568 	else
7569 		next = got_object_tree_get_first_entry(s->tree);
7570 
7571 	last = s->last_displayed_entry;
7572 	while (next && n++ < maxscroll) {
7573 		if (last) {
7574 			s->last_displayed_entry = last;
7575 			last = got_tree_entry_get_next(s->tree, last);
7576 		}
7577 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7578 			s->first_displayed_entry = next;
7579 			next = got_tree_entry_get_next(s->tree, next);
7580 		}
7581 	}
7582 
7583 	return NULL;
7584 }
7585 
7586 static const struct got_error *
7587 tree_entry_path(char **path, struct tog_parent_trees *parents,
7588     struct got_tree_entry *te)
7589 {
7590 	const struct got_error *err = NULL;
7591 	struct tog_parent_tree *pt;
7592 	size_t len = 2; /* for leading slash and NUL */
7593 
7594 	TAILQ_FOREACH(pt, parents, entry)
7595 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7596 		    + 1 /* slash */;
7597 	if (te)
7598 		len += strlen(got_tree_entry_get_name(te));
7599 
7600 	*path = calloc(1, len);
7601 	if (path == NULL)
7602 		return got_error_from_errno("calloc");
7603 
7604 	(*path)[0] = '/';
7605 	pt = TAILQ_LAST(parents, tog_parent_trees);
7606 	while (pt) {
7607 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7608 		if (strlcat(*path, name, len) >= len) {
7609 			err = got_error(GOT_ERR_NO_SPACE);
7610 			goto done;
7611 		}
7612 		if (strlcat(*path, "/", len) >= len) {
7613 			err = got_error(GOT_ERR_NO_SPACE);
7614 			goto done;
7615 		}
7616 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7617 	}
7618 	if (te) {
7619 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7620 			err = got_error(GOT_ERR_NO_SPACE);
7621 			goto done;
7622 		}
7623 	}
7624 done:
7625 	if (err) {
7626 		free(*path);
7627 		*path = NULL;
7628 	}
7629 	return err;
7630 }
7631 
7632 static const struct got_error *
7633 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7634     struct got_tree_entry *te, struct tog_parent_trees *parents,
7635     struct got_object_id *commit_id, struct got_repository *repo)
7636 {
7637 	const struct got_error *err = NULL;
7638 	char *path;
7639 	struct tog_view *blame_view;
7640 
7641 	*new_view = NULL;
7642 
7643 	err = tree_entry_path(&path, parents, te);
7644 	if (err)
7645 		return err;
7646 
7647 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7648 	if (blame_view == NULL) {
7649 		err = got_error_from_errno("view_open");
7650 		goto done;
7651 	}
7652 
7653 	err = open_blame_view(blame_view, path, commit_id, repo);
7654 	if (err) {
7655 		if (err->code == GOT_ERR_CANCELLED)
7656 			err = NULL;
7657 		view_close(blame_view);
7658 	} else
7659 		*new_view = blame_view;
7660 done:
7661 	free(path);
7662 	return err;
7663 }
7664 
7665 static const struct got_error *
7666 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7667     struct tog_tree_view_state *s)
7668 {
7669 	struct tog_view *log_view;
7670 	const struct got_error *err = NULL;
7671 	char *path;
7672 
7673 	*new_view = NULL;
7674 
7675 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7676 	if (log_view == NULL)
7677 		return got_error_from_errno("view_open");
7678 
7679 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7680 	if (err)
7681 		return err;
7682 
7683 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7684 	    path, 0, NULL);
7685 	if (err)
7686 		view_close(log_view);
7687 	else
7688 		*new_view = log_view;
7689 	free(path);
7690 	return err;
7691 }
7692 
7693 static const struct got_error *
7694 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7695     const char *head_ref_name, struct got_repository *repo)
7696 {
7697 	const struct got_error *err = NULL;
7698 	char *commit_id_str = NULL;
7699 	struct tog_tree_view_state *s = &view->state.tree;
7700 	struct got_commit_object *commit = NULL;
7701 
7702 	TAILQ_INIT(&s->parents);
7703 	STAILQ_INIT(&s->colors);
7704 
7705 	s->commit_id = got_object_id_dup(commit_id);
7706 	if (s->commit_id == NULL) {
7707 		err = got_error_from_errno("got_object_id_dup");
7708 		goto done;
7709 	}
7710 
7711 	err = got_object_open_as_commit(&commit, repo, commit_id);
7712 	if (err)
7713 		goto done;
7714 
7715 	/*
7716 	 * The root is opened here and will be closed when the view is closed.
7717 	 * Any visited subtrees and their path-wise parents are opened and
7718 	 * closed on demand.
7719 	 */
7720 	err = got_object_open_as_tree(&s->root, repo,
7721 	    got_object_commit_get_tree_id(commit));
7722 	if (err)
7723 		goto done;
7724 	s->tree = s->root;
7725 
7726 	err = got_object_id_str(&commit_id_str, commit_id);
7727 	if (err != NULL)
7728 		goto done;
7729 
7730 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7731 		err = got_error_from_errno("asprintf");
7732 		goto done;
7733 	}
7734 
7735 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7736 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7737 	if (head_ref_name) {
7738 		s->head_ref_name = strdup(head_ref_name);
7739 		if (s->head_ref_name == NULL) {
7740 			err = got_error_from_errno("strdup");
7741 			goto done;
7742 		}
7743 	}
7744 	s->repo = repo;
7745 
7746 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7747 		err = add_color(&s->colors, "\\$$",
7748 		    TOG_COLOR_TREE_SUBMODULE,
7749 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7750 		if (err)
7751 			goto done;
7752 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7753 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7754 		if (err)
7755 			goto done;
7756 		err = add_color(&s->colors, "/$",
7757 		    TOG_COLOR_TREE_DIRECTORY,
7758 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7759 		if (err)
7760 			goto done;
7761 
7762 		err = add_color(&s->colors, "\\*$",
7763 		    TOG_COLOR_TREE_EXECUTABLE,
7764 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7765 		if (err)
7766 			goto done;
7767 
7768 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7769 		    get_color_value("TOG_COLOR_COMMIT"));
7770 		if (err)
7771 			goto done;
7772 	}
7773 
7774 	view->show = show_tree_view;
7775 	view->input = input_tree_view;
7776 	view->close = close_tree_view;
7777 	view->search_start = search_start_tree_view;
7778 	view->search_next = search_next_tree_view;
7779 done:
7780 	free(commit_id_str);
7781 	if (commit)
7782 		got_object_commit_close(commit);
7783 	if (err) {
7784 		if (view->close == NULL)
7785 			close_tree_view(view);
7786 		view_close(view);
7787 	}
7788 	return err;
7789 }
7790 
7791 static const struct got_error *
7792 close_tree_view(struct tog_view *view)
7793 {
7794 	struct tog_tree_view_state *s = &view->state.tree;
7795 
7796 	free_colors(&s->colors);
7797 	free(s->tree_label);
7798 	s->tree_label = NULL;
7799 	free(s->commit_id);
7800 	s->commit_id = NULL;
7801 	free(s->head_ref_name);
7802 	s->head_ref_name = NULL;
7803 	while (!TAILQ_EMPTY(&s->parents)) {
7804 		struct tog_parent_tree *parent;
7805 		parent = TAILQ_FIRST(&s->parents);
7806 		TAILQ_REMOVE(&s->parents, parent, entry);
7807 		if (parent->tree != s->root)
7808 			got_object_tree_close(parent->tree);
7809 		free(parent);
7810 
7811 	}
7812 	if (s->tree != NULL && s->tree != s->root)
7813 		got_object_tree_close(s->tree);
7814 	if (s->root)
7815 		got_object_tree_close(s->root);
7816 	return NULL;
7817 }
7818 
7819 static const struct got_error *
7820 search_start_tree_view(struct tog_view *view)
7821 {
7822 	struct tog_tree_view_state *s = &view->state.tree;
7823 
7824 	s->matched_entry = NULL;
7825 	return NULL;
7826 }
7827 
7828 static int
7829 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7830 {
7831 	regmatch_t regmatch;
7832 
7833 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7834 	    0) == 0;
7835 }
7836 
7837 static const struct got_error *
7838 search_next_tree_view(struct tog_view *view)
7839 {
7840 	struct tog_tree_view_state *s = &view->state.tree;
7841 	struct got_tree_entry *te = NULL;
7842 
7843 	if (!view->searching) {
7844 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7845 		return NULL;
7846 	}
7847 
7848 	if (s->matched_entry) {
7849 		if (view->searching == TOG_SEARCH_FORWARD) {
7850 			if (s->selected_entry)
7851 				te = got_tree_entry_get_next(s->tree,
7852 				    s->selected_entry);
7853 			else
7854 				te = got_object_tree_get_first_entry(s->tree);
7855 		} else {
7856 			if (s->selected_entry == NULL)
7857 				te = got_object_tree_get_last_entry(s->tree);
7858 			else
7859 				te = got_tree_entry_get_prev(s->tree,
7860 				    s->selected_entry);
7861 		}
7862 	} else {
7863 		if (s->selected_entry)
7864 			te = s->selected_entry;
7865 		else if (view->searching == TOG_SEARCH_FORWARD)
7866 			te = got_object_tree_get_first_entry(s->tree);
7867 		else
7868 			te = got_object_tree_get_last_entry(s->tree);
7869 	}
7870 
7871 	while (1) {
7872 		if (te == NULL) {
7873 			if (s->matched_entry == NULL) {
7874 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7875 				return NULL;
7876 			}
7877 			if (view->searching == TOG_SEARCH_FORWARD)
7878 				te = got_object_tree_get_first_entry(s->tree);
7879 			else
7880 				te = got_object_tree_get_last_entry(s->tree);
7881 		}
7882 
7883 		if (match_tree_entry(te, &view->regex)) {
7884 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7885 			s->matched_entry = te;
7886 			break;
7887 		}
7888 
7889 		if (view->searching == TOG_SEARCH_FORWARD)
7890 			te = got_tree_entry_get_next(s->tree, te);
7891 		else
7892 			te = got_tree_entry_get_prev(s->tree, te);
7893 	}
7894 
7895 	if (s->matched_entry) {
7896 		s->first_displayed_entry = s->matched_entry;
7897 		s->selected = 0;
7898 	}
7899 
7900 	return NULL;
7901 }
7902 
7903 static const struct got_error *
7904 show_tree_view(struct tog_view *view)
7905 {
7906 	const struct got_error *err = NULL;
7907 	struct tog_tree_view_state *s = &view->state.tree;
7908 	char *parent_path;
7909 
7910 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7911 	if (err)
7912 		return err;
7913 
7914 	err = draw_tree_entries(view, parent_path);
7915 	free(parent_path);
7916 
7917 	view_border(view);
7918 	return err;
7919 }
7920 
7921 static const struct got_error *
7922 tree_goto_line(struct tog_view *view, int nlines)
7923 {
7924 	const struct got_error		 *err = NULL;
7925 	struct tog_tree_view_state	 *s = &view->state.tree;
7926 	struct got_tree_entry		**fte, **lte, **ste;
7927 	int				  g, last, first = 1, i = 1;
7928 	int				  root = s->tree == s->root;
7929 	int				  off = root ? 1 : 2;
7930 
7931 	g = view->gline;
7932 	view->gline = 0;
7933 
7934 	if (g == 0)
7935 		g = 1;
7936 	else if (g > got_object_tree_get_nentries(s->tree))
7937 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7938 
7939 	fte = &s->first_displayed_entry;
7940 	lte = &s->last_displayed_entry;
7941 	ste = &s->selected_entry;
7942 
7943 	if (*fte != NULL) {
7944 		first = got_tree_entry_get_index(*fte);
7945 		first += off;  /* account for ".." */
7946 	}
7947 	last = got_tree_entry_get_index(*lte);
7948 	last += off;
7949 
7950 	if (g >= first && g <= last && g - first < nlines) {
7951 		s->selected = g - first;
7952 		return NULL;	/* gline is on the current page */
7953 	}
7954 
7955 	if (*ste != NULL) {
7956 		i = got_tree_entry_get_index(*ste);
7957 		i += off;
7958 	}
7959 
7960 	if (i < g) {
7961 		err = tree_scroll_down(view, g - i);
7962 		if (err)
7963 			return err;
7964 		if (got_tree_entry_get_index(*lte) >=
7965 		    got_object_tree_get_nentries(s->tree) - 1 &&
7966 		    first + s->selected < g &&
7967 		    s->selected < s->ndisplayed - 1) {
7968 			first = got_tree_entry_get_index(*fte);
7969 			first += off;
7970 			s->selected = g - first;
7971 		}
7972 	} else if (i > g)
7973 		tree_scroll_up(s, i - g);
7974 
7975 	if (g < nlines &&
7976 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7977 		s->selected = g - 1;
7978 
7979 	return NULL;
7980 }
7981 
7982 static const struct got_error *
7983 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7984 {
7985 	const struct got_error *err = NULL;
7986 	struct tog_tree_view_state *s = &view->state.tree;
7987 	struct got_tree_entry *te;
7988 	int n, nscroll = view->nlines - 3;
7989 
7990 	if (view->gline)
7991 		return tree_goto_line(view, nscroll);
7992 
7993 	switch (ch) {
7994 	case '0':
7995 	case '$':
7996 	case KEY_RIGHT:
7997 	case 'l':
7998 	case KEY_LEFT:
7999 	case 'h':
8000 		horizontal_scroll_input(view, ch);
8001 		break;
8002 	case 'i':
8003 		s->show_ids = !s->show_ids;
8004 		view->count = 0;
8005 		break;
8006 	case 'L':
8007 		view->count = 0;
8008 		if (!s->selected_entry)
8009 			break;
8010 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8011 		break;
8012 	case 'R':
8013 		view->count = 0;
8014 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8015 		break;
8016 	case 'g':
8017 	case '=':
8018 	case KEY_HOME:
8019 		s->selected = 0;
8020 		view->count = 0;
8021 		if (s->tree == s->root)
8022 			s->first_displayed_entry =
8023 			    got_object_tree_get_first_entry(s->tree);
8024 		else
8025 			s->first_displayed_entry = NULL;
8026 		break;
8027 	case 'G':
8028 	case '*':
8029 	case KEY_END: {
8030 		int eos = view->nlines - 3;
8031 
8032 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8033 			--eos;  /* border */
8034 		s->selected = 0;
8035 		view->count = 0;
8036 		te = got_object_tree_get_last_entry(s->tree);
8037 		for (n = 0; n < eos; n++) {
8038 			if (te == NULL) {
8039 				if (s->tree != s->root) {
8040 					s->first_displayed_entry = NULL;
8041 					n++;
8042 				}
8043 				break;
8044 			}
8045 			s->first_displayed_entry = te;
8046 			te = got_tree_entry_get_prev(s->tree, te);
8047 		}
8048 		if (n > 0)
8049 			s->selected = n - 1;
8050 		break;
8051 	}
8052 	case 'k':
8053 	case KEY_UP:
8054 	case CTRL('p'):
8055 		if (s->selected > 0) {
8056 			s->selected--;
8057 			break;
8058 		}
8059 		tree_scroll_up(s, 1);
8060 		if (s->selected_entry == NULL ||
8061 		    (s->tree == s->root && s->selected_entry ==
8062 		     got_object_tree_get_first_entry(s->tree)))
8063 			view->count = 0;
8064 		break;
8065 	case CTRL('u'):
8066 	case 'u':
8067 		nscroll /= 2;
8068 		/* FALL THROUGH */
8069 	case KEY_PPAGE:
8070 	case CTRL('b'):
8071 	case 'b':
8072 		if (s->tree == s->root) {
8073 			if (got_object_tree_get_first_entry(s->tree) ==
8074 			    s->first_displayed_entry)
8075 				s->selected -= MIN(s->selected, nscroll);
8076 		} else {
8077 			if (s->first_displayed_entry == NULL)
8078 				s->selected -= MIN(s->selected, nscroll);
8079 		}
8080 		tree_scroll_up(s, MAX(0, nscroll));
8081 		if (s->selected_entry == NULL ||
8082 		    (s->tree == s->root && s->selected_entry ==
8083 		     got_object_tree_get_first_entry(s->tree)))
8084 			view->count = 0;
8085 		break;
8086 	case 'j':
8087 	case KEY_DOWN:
8088 	case CTRL('n'):
8089 		if (s->selected < s->ndisplayed - 1) {
8090 			s->selected++;
8091 			break;
8092 		}
8093 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8094 		    == NULL) {
8095 			/* can't scroll any further */
8096 			view->count = 0;
8097 			break;
8098 		}
8099 		tree_scroll_down(view, 1);
8100 		break;
8101 	case CTRL('d'):
8102 	case 'd':
8103 		nscroll /= 2;
8104 		/* FALL THROUGH */
8105 	case KEY_NPAGE:
8106 	case CTRL('f'):
8107 	case 'f':
8108 	case ' ':
8109 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8110 		    == NULL) {
8111 			/* can't scroll any further; move cursor down */
8112 			if (s->selected < s->ndisplayed - 1)
8113 				s->selected += MIN(nscroll,
8114 				    s->ndisplayed - s->selected - 1);
8115 			else
8116 				view->count = 0;
8117 			break;
8118 		}
8119 		tree_scroll_down(view, nscroll);
8120 		break;
8121 	case KEY_ENTER:
8122 	case '\r':
8123 	case KEY_BACKSPACE:
8124 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8125 			struct tog_parent_tree *parent;
8126 			/* user selected '..' */
8127 			if (s->tree == s->root) {
8128 				view->count = 0;
8129 				break;
8130 			}
8131 			parent = TAILQ_FIRST(&s->parents);
8132 			TAILQ_REMOVE(&s->parents, parent,
8133 			    entry);
8134 			got_object_tree_close(s->tree);
8135 			s->tree = parent->tree;
8136 			s->first_displayed_entry =
8137 			    parent->first_displayed_entry;
8138 			s->selected_entry =
8139 			    parent->selected_entry;
8140 			s->selected = parent->selected;
8141 			if (s->selected > view->nlines - 3) {
8142 				err = offset_selection_down(view);
8143 				if (err)
8144 					break;
8145 			}
8146 			free(parent);
8147 		} else if (S_ISDIR(got_tree_entry_get_mode(
8148 		    s->selected_entry))) {
8149 			struct got_tree_object *subtree;
8150 			view->count = 0;
8151 			err = got_object_open_as_tree(&subtree, s->repo,
8152 			    got_tree_entry_get_id(s->selected_entry));
8153 			if (err)
8154 				break;
8155 			err = tree_view_visit_subtree(s, subtree);
8156 			if (err) {
8157 				got_object_tree_close(subtree);
8158 				break;
8159 			}
8160 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8161 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8162 		break;
8163 	case KEY_RESIZE:
8164 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8165 			s->selected = view->nlines - 4;
8166 		view->count = 0;
8167 		break;
8168 	default:
8169 		view->count = 0;
8170 		break;
8171 	}
8172 
8173 	return err;
8174 }
8175 
8176 __dead static void
8177 usage_tree(void)
8178 {
8179 	endwin();
8180 	fprintf(stderr,
8181 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8182 	    getprogname());
8183 	exit(1);
8184 }
8185 
8186 static const struct got_error *
8187 cmd_tree(int argc, char *argv[])
8188 {
8189 	const struct got_error *error;
8190 	struct got_repository *repo = NULL;
8191 	struct got_worktree *worktree = NULL;
8192 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8193 	struct got_object_id *commit_id = NULL;
8194 	struct got_commit_object *commit = NULL;
8195 	const char *commit_id_arg = NULL;
8196 	char *keyword_idstr = NULL, *label = NULL;
8197 	struct got_reference *ref = NULL;
8198 	const char *head_ref_name = NULL;
8199 	int ch;
8200 	struct tog_view *view;
8201 	int *pack_fds = NULL;
8202 
8203 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8204 		switch (ch) {
8205 		case 'c':
8206 			commit_id_arg = optarg;
8207 			break;
8208 		case 'r':
8209 			repo_path = realpath(optarg, NULL);
8210 			if (repo_path == NULL)
8211 				return got_error_from_errno2("realpath",
8212 				    optarg);
8213 			break;
8214 		default:
8215 			usage_tree();
8216 			/* NOTREACHED */
8217 		}
8218 	}
8219 
8220 	argc -= optind;
8221 	argv += optind;
8222 
8223 	if (argc > 1)
8224 		usage_tree();
8225 
8226 	error = got_repo_pack_fds_open(&pack_fds);
8227 	if (error != NULL)
8228 		goto done;
8229 
8230 	if (repo_path == NULL) {
8231 		cwd = getcwd(NULL, 0);
8232 		if (cwd == NULL)
8233 			return got_error_from_errno("getcwd");
8234 		error = got_worktree_open(&worktree, cwd, NULL);
8235 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8236 			goto done;
8237 		if (worktree)
8238 			repo_path =
8239 			    strdup(got_worktree_get_repo_path(worktree));
8240 		else
8241 			repo_path = strdup(cwd);
8242 		if (repo_path == NULL) {
8243 			error = got_error_from_errno("strdup");
8244 			goto done;
8245 		}
8246 	}
8247 
8248 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8249 	if (error != NULL)
8250 		goto done;
8251 
8252 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8253 	    repo, worktree);
8254 	if (error)
8255 		goto done;
8256 
8257 	init_curses();
8258 
8259 	error = apply_unveil(got_repo_get_path(repo), NULL);
8260 	if (error)
8261 		goto done;
8262 
8263 	error = tog_load_refs(repo, 0);
8264 	if (error)
8265 		goto done;
8266 
8267 	if (commit_id_arg == NULL) {
8268 		error = got_repo_match_object_id(&commit_id, &label,
8269 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8270 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8271 		if (error)
8272 			goto done;
8273 		head_ref_name = label;
8274 	} else {
8275 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8276 		    repo, worktree);
8277 		if (error != NULL)
8278 			goto done;
8279 		if (keyword_idstr != NULL)
8280 			commit_id_arg = keyword_idstr;
8281 
8282 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8283 		if (error == NULL)
8284 			head_ref_name = got_ref_get_name(ref);
8285 		else if (error->code != GOT_ERR_NOT_REF)
8286 			goto done;
8287 		error = got_repo_match_object_id(&commit_id, NULL,
8288 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8289 		if (error)
8290 			goto done;
8291 	}
8292 
8293 	error = got_object_open_as_commit(&commit, repo, commit_id);
8294 	if (error)
8295 		goto done;
8296 
8297 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8298 	if (view == NULL) {
8299 		error = got_error_from_errno("view_open");
8300 		goto done;
8301 	}
8302 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8303 	if (error)
8304 		goto done;
8305 	if (!got_path_is_root_dir(in_repo_path)) {
8306 		error = tree_view_walk_path(&view->state.tree, commit,
8307 		    in_repo_path);
8308 		if (error)
8309 			goto done;
8310 	}
8311 
8312 	if (worktree) {
8313 		error = set_tog_base_commit(repo, worktree);
8314 		if (error != NULL)
8315 			goto done;
8316 
8317 		/* Release work tree lock. */
8318 		got_worktree_close(worktree);
8319 		worktree = NULL;
8320 	}
8321 
8322 	error = view_loop(view);
8323 
8324 done:
8325 	free(tog_base_commit.id);
8326 	free(keyword_idstr);
8327 	free(repo_path);
8328 	free(cwd);
8329 	free(commit_id);
8330 	free(label);
8331 	if (ref)
8332 		got_ref_close(ref);
8333 	if (worktree != NULL)
8334 		got_worktree_close(worktree);
8335 	if (repo) {
8336 		const struct got_error *close_err = got_repo_close(repo);
8337 		if (error == NULL)
8338 			error = close_err;
8339 	}
8340 	if (pack_fds) {
8341 		const struct got_error *pack_err =
8342 		    got_repo_pack_fds_close(pack_fds);
8343 		if (error == NULL)
8344 			error = pack_err;
8345 	}
8346 	tog_free_refs();
8347 	return error;
8348 }
8349 
8350 static const struct got_error *
8351 ref_view_load_refs(struct tog_ref_view_state *s)
8352 {
8353 	struct got_reflist_entry *sre;
8354 	struct tog_reflist_entry *re;
8355 
8356 	s->nrefs = 0;
8357 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8358 		if (strncmp(got_ref_get_name(sre->ref),
8359 		    "refs/got/", 9) == 0 &&
8360 		    strncmp(got_ref_get_name(sre->ref),
8361 		    "refs/got/backup/", 16) != 0)
8362 			continue;
8363 
8364 		re = malloc(sizeof(*re));
8365 		if (re == NULL)
8366 			return got_error_from_errno("malloc");
8367 
8368 		re->ref = got_ref_dup(sre->ref);
8369 		if (re->ref == NULL)
8370 			return got_error_from_errno("got_ref_dup");
8371 		re->idx = s->nrefs++;
8372 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8373 	}
8374 
8375 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8376 	return NULL;
8377 }
8378 
8379 static void
8380 ref_view_free_refs(struct tog_ref_view_state *s)
8381 {
8382 	struct tog_reflist_entry *re;
8383 
8384 	while (!TAILQ_EMPTY(&s->refs)) {
8385 		re = TAILQ_FIRST(&s->refs);
8386 		TAILQ_REMOVE(&s->refs, re, entry);
8387 		got_ref_close(re->ref);
8388 		free(re);
8389 	}
8390 }
8391 
8392 static const struct got_error *
8393 open_ref_view(struct tog_view *view, struct got_repository *repo)
8394 {
8395 	const struct got_error *err = NULL;
8396 	struct tog_ref_view_state *s = &view->state.ref;
8397 
8398 	s->selected_entry = 0;
8399 	s->repo = repo;
8400 
8401 	TAILQ_INIT(&s->refs);
8402 	STAILQ_INIT(&s->colors);
8403 
8404 	err = ref_view_load_refs(s);
8405 	if (err)
8406 		goto done;
8407 
8408 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8409 		err = add_color(&s->colors, "^refs/heads/",
8410 		    TOG_COLOR_REFS_HEADS,
8411 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8412 		if (err)
8413 			goto done;
8414 
8415 		err = add_color(&s->colors, "^refs/tags/",
8416 		    TOG_COLOR_REFS_TAGS,
8417 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8418 		if (err)
8419 			goto done;
8420 
8421 		err = add_color(&s->colors, "^refs/remotes/",
8422 		    TOG_COLOR_REFS_REMOTES,
8423 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8424 		if (err)
8425 			goto done;
8426 
8427 		err = add_color(&s->colors, "^refs/got/backup/",
8428 		    TOG_COLOR_REFS_BACKUP,
8429 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8430 		if (err)
8431 			goto done;
8432 	}
8433 
8434 	view->show = show_ref_view;
8435 	view->input = input_ref_view;
8436 	view->close = close_ref_view;
8437 	view->search_start = search_start_ref_view;
8438 	view->search_next = search_next_ref_view;
8439 done:
8440 	if (err) {
8441 		if (view->close == NULL)
8442 			close_ref_view(view);
8443 		view_close(view);
8444 	}
8445 	return err;
8446 }
8447 
8448 static const struct got_error *
8449 close_ref_view(struct tog_view *view)
8450 {
8451 	struct tog_ref_view_state *s = &view->state.ref;
8452 
8453 	ref_view_free_refs(s);
8454 	free_colors(&s->colors);
8455 
8456 	return NULL;
8457 }
8458 
8459 static const struct got_error *
8460 resolve_reflist_entry(struct got_object_id **commit_id,
8461     struct tog_reflist_entry *re, struct got_repository *repo)
8462 {
8463 	const struct got_error *err = NULL;
8464 	struct got_object_id *obj_id;
8465 	struct got_tag_object *tag = NULL;
8466 	int obj_type;
8467 
8468 	*commit_id = NULL;
8469 
8470 	err = got_ref_resolve(&obj_id, repo, re->ref);
8471 	if (err)
8472 		return err;
8473 
8474 	err = got_object_get_type(&obj_type, repo, obj_id);
8475 	if (err)
8476 		goto done;
8477 
8478 	switch (obj_type) {
8479 	case GOT_OBJ_TYPE_COMMIT:
8480 		*commit_id = obj_id;
8481 		break;
8482 	case GOT_OBJ_TYPE_TAG:
8483 		err = got_object_open_as_tag(&tag, repo, obj_id);
8484 		if (err)
8485 			goto done;
8486 		free(obj_id);
8487 		err = got_object_get_type(&obj_type, repo,
8488 		    got_object_tag_get_object_id(tag));
8489 		if (err)
8490 			goto done;
8491 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8492 			err = got_error(GOT_ERR_OBJ_TYPE);
8493 			goto done;
8494 		}
8495 		*commit_id = got_object_id_dup(
8496 		    got_object_tag_get_object_id(tag));
8497 		if (*commit_id == NULL) {
8498 			err = got_error_from_errno("got_object_id_dup");
8499 			goto done;
8500 		}
8501 		break;
8502 	default:
8503 		err = got_error(GOT_ERR_OBJ_TYPE);
8504 		break;
8505 	}
8506 
8507 done:
8508 	if (tag)
8509 		got_object_tag_close(tag);
8510 	if (err) {
8511 		free(*commit_id);
8512 		*commit_id = NULL;
8513 	}
8514 	return err;
8515 }
8516 
8517 static const struct got_error *
8518 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8519     struct tog_reflist_entry *re, struct got_repository *repo)
8520 {
8521 	struct tog_view *log_view;
8522 	const struct got_error *err = NULL;
8523 	struct got_object_id *commit_id = NULL;
8524 
8525 	*new_view = NULL;
8526 
8527 	err = resolve_reflist_entry(&commit_id, re, repo);
8528 	if (err) {
8529 		if (err->code != GOT_ERR_OBJ_TYPE)
8530 			return err;
8531 		else
8532 			return NULL;
8533 	}
8534 
8535 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8536 	if (log_view == NULL) {
8537 		err = got_error_from_errno("view_open");
8538 		goto done;
8539 	}
8540 
8541 	err = open_log_view(log_view, commit_id, repo,
8542 	    got_ref_get_name(re->ref), "", 0, NULL);
8543 done:
8544 	if (err)
8545 		view_close(log_view);
8546 	else
8547 		*new_view = log_view;
8548 	free(commit_id);
8549 	return err;
8550 }
8551 
8552 static void
8553 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8554 {
8555 	struct tog_reflist_entry *re;
8556 	int i = 0;
8557 
8558 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8559 		return;
8560 
8561 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8562 	while (i++ < maxscroll) {
8563 		if (re == NULL)
8564 			break;
8565 		s->first_displayed_entry = re;
8566 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8567 	}
8568 }
8569 
8570 static const struct got_error *
8571 ref_scroll_down(struct tog_view *view, int maxscroll)
8572 {
8573 	struct tog_ref_view_state *s = &view->state.ref;
8574 	struct tog_reflist_entry *next, *last;
8575 	int n = 0;
8576 
8577 	if (s->first_displayed_entry)
8578 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8579 	else
8580 		next = TAILQ_FIRST(&s->refs);
8581 
8582 	last = s->last_displayed_entry;
8583 	while (next && n++ < maxscroll) {
8584 		if (last) {
8585 			s->last_displayed_entry = last;
8586 			last = TAILQ_NEXT(last, entry);
8587 		}
8588 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8589 			s->first_displayed_entry = next;
8590 			next = TAILQ_NEXT(next, entry);
8591 		}
8592 	}
8593 
8594 	return NULL;
8595 }
8596 
8597 static const struct got_error *
8598 search_start_ref_view(struct tog_view *view)
8599 {
8600 	struct tog_ref_view_state *s = &view->state.ref;
8601 
8602 	s->matched_entry = NULL;
8603 	return NULL;
8604 }
8605 
8606 static int
8607 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8608 {
8609 	regmatch_t regmatch;
8610 
8611 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8612 	    0) == 0;
8613 }
8614 
8615 static const struct got_error *
8616 search_next_ref_view(struct tog_view *view)
8617 {
8618 	struct tog_ref_view_state *s = &view->state.ref;
8619 	struct tog_reflist_entry *re = NULL;
8620 
8621 	if (!view->searching) {
8622 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8623 		return NULL;
8624 	}
8625 
8626 	if (s->matched_entry) {
8627 		if (view->searching == TOG_SEARCH_FORWARD) {
8628 			if (s->selected_entry)
8629 				re = TAILQ_NEXT(s->selected_entry, entry);
8630 			else
8631 				re = TAILQ_PREV(s->selected_entry,
8632 				    tog_reflist_head, entry);
8633 		} else {
8634 			if (s->selected_entry == NULL)
8635 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8636 			else
8637 				re = TAILQ_PREV(s->selected_entry,
8638 				    tog_reflist_head, entry);
8639 		}
8640 	} else {
8641 		if (s->selected_entry)
8642 			re = s->selected_entry;
8643 		else if (view->searching == TOG_SEARCH_FORWARD)
8644 			re = TAILQ_FIRST(&s->refs);
8645 		else
8646 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8647 	}
8648 
8649 	while (1) {
8650 		if (re == NULL) {
8651 			if (s->matched_entry == NULL) {
8652 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8653 				return NULL;
8654 			}
8655 			if (view->searching == TOG_SEARCH_FORWARD)
8656 				re = TAILQ_FIRST(&s->refs);
8657 			else
8658 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8659 		}
8660 
8661 		if (match_reflist_entry(re, &view->regex)) {
8662 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8663 			s->matched_entry = re;
8664 			break;
8665 		}
8666 
8667 		if (view->searching == TOG_SEARCH_FORWARD)
8668 			re = TAILQ_NEXT(re, entry);
8669 		else
8670 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8671 	}
8672 
8673 	if (s->matched_entry) {
8674 		s->first_displayed_entry = s->matched_entry;
8675 		s->selected = 0;
8676 	}
8677 
8678 	return NULL;
8679 }
8680 
8681 static const struct got_error *
8682 show_ref_view(struct tog_view *view)
8683 {
8684 	const struct got_error *err = NULL;
8685 	struct tog_ref_view_state *s = &view->state.ref;
8686 	struct tog_reflist_entry *re;
8687 	char *line = NULL;
8688 	wchar_t *wline;
8689 	struct tog_color *tc;
8690 	int width, n, scrollx;
8691 	int limit = view->nlines;
8692 
8693 	werase(view->window);
8694 
8695 	s->ndisplayed = 0;
8696 	if (view_is_hsplit_top(view))
8697 		--limit;  /* border */
8698 
8699 	if (limit == 0)
8700 		return NULL;
8701 
8702 	re = s->first_displayed_entry;
8703 
8704 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8705 	    s->nrefs) == -1)
8706 		return got_error_from_errno("asprintf");
8707 
8708 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8709 	if (err) {
8710 		free(line);
8711 		return err;
8712 	}
8713 	if (view_needs_focus_indication(view))
8714 		wstandout(view->window);
8715 	waddwstr(view->window, wline);
8716 	while (width++ < view->ncols)
8717 		waddch(view->window, ' ');
8718 	if (view_needs_focus_indication(view))
8719 		wstandend(view->window);
8720 	free(wline);
8721 	wline = NULL;
8722 	free(line);
8723 	line = NULL;
8724 	if (--limit <= 0)
8725 		return NULL;
8726 
8727 	n = 0;
8728 	view->maxx = 0;
8729 	while (re && limit > 0) {
8730 		char *line = NULL;
8731 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8732 
8733 		if (s->show_date) {
8734 			struct got_commit_object *ci;
8735 			struct got_tag_object *tag;
8736 			struct got_object_id *id;
8737 			struct tm tm;
8738 			time_t t;
8739 
8740 			err = got_ref_resolve(&id, s->repo, re->ref);
8741 			if (err)
8742 				return err;
8743 			err = got_object_open_as_tag(&tag, s->repo, id);
8744 			if (err) {
8745 				if (err->code != GOT_ERR_OBJ_TYPE) {
8746 					free(id);
8747 					return err;
8748 				}
8749 				err = got_object_open_as_commit(&ci, s->repo,
8750 				    id);
8751 				if (err) {
8752 					free(id);
8753 					return err;
8754 				}
8755 				t = got_object_commit_get_committer_time(ci);
8756 				got_object_commit_close(ci);
8757 			} else {
8758 				t = got_object_tag_get_tagger_time(tag);
8759 				got_object_tag_close(tag);
8760 			}
8761 			free(id);
8762 			if (gmtime_r(&t, &tm) == NULL)
8763 				return got_error_from_errno("gmtime_r");
8764 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8765 				return got_error(GOT_ERR_NO_SPACE);
8766 		}
8767 		if (got_ref_is_symbolic(re->ref)) {
8768 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8769 			    ymd : "", got_ref_get_name(re->ref),
8770 			    got_ref_get_symref_target(re->ref)) == -1)
8771 				return got_error_from_errno("asprintf");
8772 		} else if (s->show_ids) {
8773 			struct got_object_id *id;
8774 			char *id_str;
8775 			err = got_ref_resolve(&id, s->repo, re->ref);
8776 			if (err)
8777 				return err;
8778 			err = got_object_id_str(&id_str, id);
8779 			if (err) {
8780 				free(id);
8781 				return err;
8782 			}
8783 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8784 			    got_ref_get_name(re->ref), id_str) == -1) {
8785 				err = got_error_from_errno("asprintf");
8786 				free(id);
8787 				free(id_str);
8788 				return err;
8789 			}
8790 			free(id);
8791 			free(id_str);
8792 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8793 		    got_ref_get_name(re->ref)) == -1)
8794 			return got_error_from_errno("asprintf");
8795 
8796 		/* use full line width to determine view->maxx */
8797 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8798 		if (err) {
8799 			free(line);
8800 			return err;
8801 		}
8802 		view->maxx = MAX(view->maxx, width);
8803 		free(wline);
8804 		wline = NULL;
8805 
8806 		err = format_line(&wline, &width, &scrollx, line, view->x,
8807 		    view->ncols, 0, 0);
8808 		if (err) {
8809 			free(line);
8810 			return err;
8811 		}
8812 		if (n == s->selected) {
8813 			if (view->focussed)
8814 				wstandout(view->window);
8815 			s->selected_entry = re;
8816 		}
8817 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8818 		if (tc)
8819 			wattr_on(view->window,
8820 			    COLOR_PAIR(tc->colorpair), NULL);
8821 		waddwstr(view->window, &wline[scrollx]);
8822 		if (tc)
8823 			wattr_off(view->window,
8824 			    COLOR_PAIR(tc->colorpair), NULL);
8825 		if (width < view->ncols)
8826 			waddch(view->window, '\n');
8827 		if (n == s->selected && view->focussed)
8828 			wstandend(view->window);
8829 		free(line);
8830 		free(wline);
8831 		wline = NULL;
8832 		n++;
8833 		s->ndisplayed++;
8834 		s->last_displayed_entry = re;
8835 
8836 		limit--;
8837 		re = TAILQ_NEXT(re, entry);
8838 	}
8839 
8840 	view_border(view);
8841 	return err;
8842 }
8843 
8844 static const struct got_error *
8845 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8846     struct tog_reflist_entry *re, struct got_repository *repo)
8847 {
8848 	const struct got_error *err = NULL;
8849 	struct got_object_id *commit_id = NULL;
8850 	struct tog_view *tree_view;
8851 
8852 	*new_view = NULL;
8853 
8854 	err = resolve_reflist_entry(&commit_id, re, repo);
8855 	if (err) {
8856 		if (err->code != GOT_ERR_OBJ_TYPE)
8857 			return err;
8858 		else
8859 			return NULL;
8860 	}
8861 
8862 
8863 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8864 	if (tree_view == NULL) {
8865 		err = got_error_from_errno("view_open");
8866 		goto done;
8867 	}
8868 
8869 	err = open_tree_view(tree_view, commit_id,
8870 	    got_ref_get_name(re->ref), repo);
8871 	if (err)
8872 		goto done;
8873 
8874 	*new_view = tree_view;
8875 done:
8876 	free(commit_id);
8877 	return err;
8878 }
8879 
8880 static const struct got_error *
8881 ref_goto_line(struct tog_view *view, int nlines)
8882 {
8883 	const struct got_error		*err = NULL;
8884 	struct tog_ref_view_state	*s = &view->state.ref;
8885 	int				 g, idx = s->selected_entry->idx;
8886 
8887 	g = view->gline;
8888 	view->gline = 0;
8889 
8890 	if (g == 0)
8891 		g = 1;
8892 	else if (g > s->nrefs)
8893 		g = s->nrefs;
8894 
8895 	if (g >= s->first_displayed_entry->idx + 1 &&
8896 	    g <= s->last_displayed_entry->idx + 1 &&
8897 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8898 		s->selected = g - s->first_displayed_entry->idx - 1;
8899 		return NULL;
8900 	}
8901 
8902 	if (idx + 1 < g) {
8903 		err = ref_scroll_down(view, g - idx - 1);
8904 		if (err)
8905 			return err;
8906 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8907 		    s->first_displayed_entry->idx + s->selected < g &&
8908 		    s->selected < s->ndisplayed - 1)
8909 			s->selected = g - s->first_displayed_entry->idx - 1;
8910 	} else if (idx + 1 > g)
8911 		ref_scroll_up(s, idx - g + 1);
8912 
8913 	if (g < nlines && s->first_displayed_entry->idx == 0)
8914 		s->selected = g - 1;
8915 
8916 	return NULL;
8917 
8918 }
8919 
8920 static const struct got_error *
8921 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8922 {
8923 	const struct got_error *err = NULL;
8924 	struct tog_ref_view_state *s = &view->state.ref;
8925 	struct tog_reflist_entry *re;
8926 	int n, nscroll = view->nlines - 1;
8927 
8928 	if (view->gline)
8929 		return ref_goto_line(view, nscroll);
8930 
8931 	switch (ch) {
8932 	case '0':
8933 	case '$':
8934 	case KEY_RIGHT:
8935 	case 'l':
8936 	case KEY_LEFT:
8937 	case 'h':
8938 		horizontal_scroll_input(view, ch);
8939 		break;
8940 	case 'i':
8941 		s->show_ids = !s->show_ids;
8942 		view->count = 0;
8943 		break;
8944 	case 'm':
8945 		s->show_date = !s->show_date;
8946 		view->count = 0;
8947 		break;
8948 	case 'o':
8949 		s->sort_by_date = !s->sort_by_date;
8950 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8951 		view->count = 0;
8952 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8953 		    got_ref_cmp_by_commit_timestamp_descending :
8954 		    tog_ref_cmp_by_name, s->repo);
8955 		if (err)
8956 			break;
8957 		got_reflist_object_id_map_free(tog_refs_idmap);
8958 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8959 		    &tog_refs, s->repo);
8960 		if (err)
8961 			break;
8962 		ref_view_free_refs(s);
8963 		err = ref_view_load_refs(s);
8964 		break;
8965 	case KEY_ENTER:
8966 	case '\r':
8967 		view->count = 0;
8968 		if (!s->selected_entry)
8969 			break;
8970 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8971 		break;
8972 	case 'T':
8973 		view->count = 0;
8974 		if (!s->selected_entry)
8975 			break;
8976 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8977 		break;
8978 	case 'g':
8979 	case '=':
8980 	case KEY_HOME:
8981 		s->selected = 0;
8982 		view->count = 0;
8983 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8984 		break;
8985 	case 'G':
8986 	case '*':
8987 	case KEY_END: {
8988 		int eos = view->nlines - 1;
8989 
8990 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8991 			--eos;  /* border */
8992 		s->selected = 0;
8993 		view->count = 0;
8994 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8995 		for (n = 0; n < eos; n++) {
8996 			if (re == NULL)
8997 				break;
8998 			s->first_displayed_entry = re;
8999 			re = TAILQ_PREV(re, tog_reflist_head, entry);
9000 		}
9001 		if (n > 0)
9002 			s->selected = n - 1;
9003 		break;
9004 	}
9005 	case 'k':
9006 	case KEY_UP:
9007 	case CTRL('p'):
9008 		if (s->selected > 0) {
9009 			s->selected--;
9010 			break;
9011 		}
9012 		ref_scroll_up(s, 1);
9013 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9014 			view->count = 0;
9015 		break;
9016 	case CTRL('u'):
9017 	case 'u':
9018 		nscroll /= 2;
9019 		/* FALL THROUGH */
9020 	case KEY_PPAGE:
9021 	case CTRL('b'):
9022 	case 'b':
9023 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9024 			s->selected -= MIN(nscroll, s->selected);
9025 		ref_scroll_up(s, MAX(0, nscroll));
9026 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9027 			view->count = 0;
9028 		break;
9029 	case 'j':
9030 	case KEY_DOWN:
9031 	case CTRL('n'):
9032 		if (s->selected < s->ndisplayed - 1) {
9033 			s->selected++;
9034 			break;
9035 		}
9036 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9037 			/* can't scroll any further */
9038 			view->count = 0;
9039 			break;
9040 		}
9041 		ref_scroll_down(view, 1);
9042 		break;
9043 	case CTRL('d'):
9044 	case 'd':
9045 		nscroll /= 2;
9046 		/* FALL THROUGH */
9047 	case KEY_NPAGE:
9048 	case CTRL('f'):
9049 	case 'f':
9050 	case ' ':
9051 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9052 			/* can't scroll any further; move cursor down */
9053 			if (s->selected < s->ndisplayed - 1)
9054 				s->selected += MIN(nscroll,
9055 				    s->ndisplayed - s->selected - 1);
9056 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9057 				s->selected += s->ndisplayed - s->selected - 1;
9058 			view->count = 0;
9059 			break;
9060 		}
9061 		ref_scroll_down(view, nscroll);
9062 		break;
9063 	case CTRL('l'):
9064 		view->count = 0;
9065 		tog_free_refs();
9066 		err = tog_load_refs(s->repo, s->sort_by_date);
9067 		if (err)
9068 			break;
9069 		ref_view_free_refs(s);
9070 		err = ref_view_load_refs(s);
9071 		break;
9072 	case KEY_RESIZE:
9073 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9074 			s->selected = view->nlines - 2;
9075 		break;
9076 	default:
9077 		view->count = 0;
9078 		break;
9079 	}
9080 
9081 	return err;
9082 }
9083 
9084 __dead static void
9085 usage_ref(void)
9086 {
9087 	endwin();
9088 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9089 	    getprogname());
9090 	exit(1);
9091 }
9092 
9093 static const struct got_error *
9094 cmd_ref(int argc, char *argv[])
9095 {
9096 	const struct got_error *error;
9097 	struct got_repository *repo = NULL;
9098 	struct got_worktree *worktree = NULL;
9099 	char *cwd = NULL, *repo_path = NULL;
9100 	int ch;
9101 	struct tog_view *view;
9102 	int *pack_fds = NULL;
9103 
9104 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9105 		switch (ch) {
9106 		case 'r':
9107 			repo_path = realpath(optarg, NULL);
9108 			if (repo_path == NULL)
9109 				return got_error_from_errno2("realpath",
9110 				    optarg);
9111 			break;
9112 		default:
9113 			usage_ref();
9114 			/* NOTREACHED */
9115 		}
9116 	}
9117 
9118 	argc -= optind;
9119 	argv += optind;
9120 
9121 	if (argc > 1)
9122 		usage_ref();
9123 
9124 	error = got_repo_pack_fds_open(&pack_fds);
9125 	if (error != NULL)
9126 		goto done;
9127 
9128 	if (repo_path == NULL) {
9129 		cwd = getcwd(NULL, 0);
9130 		if (cwd == NULL)
9131 			return got_error_from_errno("getcwd");
9132 		error = got_worktree_open(&worktree, cwd, NULL);
9133 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9134 			goto done;
9135 		if (worktree)
9136 			repo_path =
9137 			    strdup(got_worktree_get_repo_path(worktree));
9138 		else
9139 			repo_path = strdup(cwd);
9140 		if (repo_path == NULL) {
9141 			error = got_error_from_errno("strdup");
9142 			goto done;
9143 		}
9144 	}
9145 
9146 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9147 	if (error != NULL)
9148 		goto done;
9149 
9150 	init_curses();
9151 
9152 	error = apply_unveil(got_repo_get_path(repo), NULL);
9153 	if (error)
9154 		goto done;
9155 
9156 	error = tog_load_refs(repo, 0);
9157 	if (error)
9158 		goto done;
9159 
9160 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9161 	if (view == NULL) {
9162 		error = got_error_from_errno("view_open");
9163 		goto done;
9164 	}
9165 
9166 	error = open_ref_view(view, repo);
9167 	if (error)
9168 		goto done;
9169 
9170 	if (worktree) {
9171 		error = set_tog_base_commit(repo, worktree);
9172 		if (error != NULL)
9173 			goto done;
9174 
9175 		/* Release work tree lock. */
9176 		got_worktree_close(worktree);
9177 		worktree = NULL;
9178 	}
9179 
9180 	error = view_loop(view);
9181 
9182 done:
9183 	free(tog_base_commit.id);
9184 	free(repo_path);
9185 	free(cwd);
9186 	if (worktree != NULL)
9187 		got_worktree_close(worktree);
9188 	if (repo) {
9189 		const struct got_error *close_err = got_repo_close(repo);
9190 		if (close_err)
9191 			error = close_err;
9192 	}
9193 	if (pack_fds) {
9194 		const struct got_error *pack_err =
9195 		    got_repo_pack_fds_close(pack_fds);
9196 		if (error == NULL)
9197 			error = pack_err;
9198 	}
9199 	tog_free_refs();
9200 	return error;
9201 }
9202 
9203 static const struct got_error*
9204 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9205     const char *str)
9206 {
9207 	size_t len;
9208 
9209 	if (win == NULL)
9210 		win = stdscr;
9211 
9212 	len = strlen(str);
9213 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9214 
9215 	if (focus)
9216 		wstandout(win);
9217 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9218 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9219 	if (focus)
9220 		wstandend(win);
9221 
9222 	return NULL;
9223 }
9224 
9225 static const struct got_error *
9226 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9227 {
9228 	off_t *p;
9229 
9230 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9231 	if (p == NULL) {
9232 		free(*line_offsets);
9233 		*line_offsets = NULL;
9234 		return got_error_from_errno("reallocarray");
9235 	}
9236 
9237 	*line_offsets = p;
9238 	(*line_offsets)[*nlines] = off;
9239 	++(*nlines);
9240 	return NULL;
9241 }
9242 
9243 static const struct got_error *
9244 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9245 {
9246 	*ret = 0;
9247 
9248 	for (;n > 0; --n, ++km) {
9249 		char	*t0, *t, *k;
9250 		size_t	 len = 1;
9251 
9252 		if (km->keys == NULL)
9253 			continue;
9254 
9255 		t = t0 = strdup(km->keys);
9256 		if (t0 == NULL)
9257 			return got_error_from_errno("strdup");
9258 
9259 		len += strlen(t);
9260 		while ((k = strsep(&t, " ")) != NULL)
9261 			len += strlen(k) > 1 ? 2 : 0;
9262 		free(t0);
9263 		*ret = MAX(*ret, len);
9264 	}
9265 
9266 	return NULL;
9267 }
9268 
9269 /*
9270  * Write keymap section headers, keys, and key info in km to f.
9271  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9272  * wrap control and symbolic keys in guillemets, else use <>.
9273  */
9274 static const struct got_error *
9275 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9276 {
9277 	int n, len = width;
9278 
9279 	if (km->keys) {
9280 		static const char *u8_glyph[] = {
9281 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9282 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9283 		};
9284 		char	*t0, *t, *k;
9285 		int	 cs, s, first = 1;
9286 
9287 		cs = got_locale_is_utf8();
9288 
9289 		t = t0 = strdup(km->keys);
9290 		if (t0 == NULL)
9291 			return got_error_from_errno("strdup");
9292 
9293 		len = strlen(km->keys);
9294 		while ((k = strsep(&t, " ")) != NULL) {
9295 			s = strlen(k) > 1;  /* control or symbolic key */
9296 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9297 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9298 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9299 			if (n < 0) {
9300 				free(t0);
9301 				return got_error_from_errno("fprintf");
9302 			}
9303 			first = 0;
9304 			len += s ? 2 : 0;
9305 			*off += n;
9306 		}
9307 		free(t0);
9308 	}
9309 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9310 	if (n < 0)
9311 		return got_error_from_errno("fprintf");
9312 	*off += n;
9313 
9314 	return NULL;
9315 }
9316 
9317 static const struct got_error *
9318 format_help(struct tog_help_view_state *s)
9319 {
9320 	const struct got_error		*err = NULL;
9321 	off_t				 off = 0;
9322 	int				 i, max, n, show = s->all;
9323 	static const struct tog_key_map	 km[] = {
9324 #define KEYMAP_(info, type)	{ NULL, (info), type }
9325 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9326 		GENERATE_HELP
9327 #undef KEYMAP_
9328 #undef KEY_
9329 	};
9330 
9331 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9332 	if (err)
9333 		return err;
9334 
9335 	n = nitems(km);
9336 	err = max_key_str(&max, km, n);
9337 	if (err)
9338 		return err;
9339 
9340 	for (i = 0; i < n; ++i) {
9341 		if (km[i].keys == NULL) {
9342 			show = s->all;
9343 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9344 			    km[i].type == s->type || s->all)
9345 				show = 1;
9346 		}
9347 		if (show) {
9348 			err = format_help_line(&off, s->f, &km[i], max);
9349 			if (err)
9350 				return err;
9351 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9352 			if (err)
9353 				return err;
9354 		}
9355 	}
9356 	fputc('\n', s->f);
9357 	++off;
9358 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9359 	return err;
9360 }
9361 
9362 static const struct got_error *
9363 create_help(struct tog_help_view_state *s)
9364 {
9365 	FILE			*f;
9366 	const struct got_error	*err;
9367 
9368 	free(s->line_offsets);
9369 	s->line_offsets = NULL;
9370 	s->nlines = 0;
9371 
9372 	f = got_opentemp();
9373 	if (f == NULL)
9374 		return got_error_from_errno("got_opentemp");
9375 	s->f = f;
9376 
9377 	err = format_help(s);
9378 	if (err)
9379 		return err;
9380 
9381 	if (s->f && fflush(s->f) != 0)
9382 		return got_error_from_errno("fflush");
9383 
9384 	return NULL;
9385 }
9386 
9387 static const struct got_error *
9388 search_start_help_view(struct tog_view *view)
9389 {
9390 	view->state.help.matched_line = 0;
9391 	return NULL;
9392 }
9393 
9394 static void
9395 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9396     size_t *nlines, int **first, int **last, int **match, int **selected)
9397 {
9398 	struct tog_help_view_state *s = &view->state.help;
9399 
9400 	*f = s->f;
9401 	*nlines = s->nlines;
9402 	*line_offsets = s->line_offsets;
9403 	*match = &s->matched_line;
9404 	*first = &s->first_displayed_line;
9405 	*last = &s->last_displayed_line;
9406 	*selected = &s->selected_line;
9407 }
9408 
9409 static const struct got_error *
9410 show_help_view(struct tog_view *view)
9411 {
9412 	struct tog_help_view_state	*s = &view->state.help;
9413 	const struct got_error		*err;
9414 	regmatch_t			*regmatch = &view->regmatch;
9415 	wchar_t				*wline;
9416 	char				*line;
9417 	ssize_t				 linelen;
9418 	size_t				 linesz = 0;
9419 	int				 width, nprinted = 0, rc = 0;
9420 	int				 eos = view->nlines;
9421 
9422 	if (view_is_hsplit_top(view))
9423 		--eos;  /* account for border */
9424 
9425 	s->lineno = 0;
9426 	rewind(s->f);
9427 	werase(view->window);
9428 
9429 	if (view->gline > s->nlines - 1)
9430 		view->gline = s->nlines - 1;
9431 
9432 	err = win_draw_center(view->window, 0, 0, view->ncols,
9433 	    view_needs_focus_indication(view),
9434 	    "tog help (press q to return to tog)");
9435 	if (err)
9436 		return err;
9437 	if (eos <= 1)
9438 		return NULL;
9439 	waddstr(view->window, "\n\n");
9440 	eos -= 2;
9441 
9442 	s->eof = 0;
9443 	view->maxx = 0;
9444 	line = NULL;
9445 	while (eos > 0 && nprinted < eos) {
9446 		attr_t attr = 0;
9447 
9448 		linelen = getline(&line, &linesz, s->f);
9449 		if (linelen == -1) {
9450 			if (!feof(s->f)) {
9451 				free(line);
9452 				return got_ferror(s->f, GOT_ERR_IO);
9453 			}
9454 			s->eof = 1;
9455 			break;
9456 		}
9457 		if (++s->lineno < s->first_displayed_line)
9458 			continue;
9459 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9460 			continue;
9461 		if (s->lineno == view->hiline)
9462 			attr = A_STANDOUT;
9463 
9464 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9465 		    view->x ? 1 : 0);
9466 		if (err) {
9467 			free(line);
9468 			return err;
9469 		}
9470 		view->maxx = MAX(view->maxx, width);
9471 		free(wline);
9472 		wline = NULL;
9473 
9474 		if (attr)
9475 			wattron(view->window, attr);
9476 		if (s->first_displayed_line + nprinted == s->matched_line &&
9477 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9478 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9479 			    view->window, view->x, regmatch);
9480 			if (err) {
9481 				free(line);
9482 				return err;
9483 			}
9484 		} else {
9485 			int skip;
9486 
9487 			err = format_line(&wline, &width, &skip, line,
9488 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9489 			if (err) {
9490 				free(line);
9491 				return err;
9492 			}
9493 			waddwstr(view->window, &wline[skip]);
9494 			free(wline);
9495 			wline = NULL;
9496 		}
9497 		if (s->lineno == view->hiline) {
9498 			while (width++ < view->ncols)
9499 				waddch(view->window, ' ');
9500 		} else {
9501 			if (width < view->ncols)
9502 				waddch(view->window, '\n');
9503 		}
9504 		if (attr)
9505 			wattroff(view->window, attr);
9506 		if (++nprinted == 1)
9507 			s->first_displayed_line = s->lineno;
9508 	}
9509 	free(line);
9510 	if (nprinted > 0)
9511 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9512 	else
9513 		s->last_displayed_line = s->first_displayed_line;
9514 
9515 	view_border(view);
9516 
9517 	if (s->eof) {
9518 		rc = waddnstr(view->window,
9519 		    "See the tog(1) manual page for full documentation",
9520 		    view->ncols - 1);
9521 		if (rc == ERR)
9522 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9523 	} else {
9524 		wmove(view->window, view->nlines - 1, 0);
9525 		wclrtoeol(view->window);
9526 		wstandout(view->window);
9527 		rc = waddnstr(view->window, "scroll down for more...",
9528 		    view->ncols - 1);
9529 		if (rc == ERR)
9530 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9531 		if (getcurx(view->window) < view->ncols - 6) {
9532 			rc = wprintw(view->window, "[%.0f%%]",
9533 			    100.00 * s->last_displayed_line / s->nlines);
9534 			if (rc == ERR)
9535 				return got_error_msg(GOT_ERR_IO, "wprintw");
9536 		}
9537 		wstandend(view->window);
9538 	}
9539 
9540 	return NULL;
9541 }
9542 
9543 static const struct got_error *
9544 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9545 {
9546 	struct tog_help_view_state	*s = &view->state.help;
9547 	const struct got_error		*err = NULL;
9548 	char				*line = NULL;
9549 	ssize_t				 linelen;
9550 	size_t				 linesz = 0;
9551 	int				 eos, nscroll;
9552 
9553 	eos = nscroll = view->nlines;
9554 	if (view_is_hsplit_top(view))
9555 		--eos;  /* border */
9556 
9557 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9558 
9559 	switch (ch) {
9560 	case '0':
9561 	case '$':
9562 	case KEY_RIGHT:
9563 	case 'l':
9564 	case KEY_LEFT:
9565 	case 'h':
9566 		horizontal_scroll_input(view, ch);
9567 		break;
9568 	case 'g':
9569 	case KEY_HOME:
9570 		s->first_displayed_line = 1;
9571 		view->count = 0;
9572 		break;
9573 	case 'G':
9574 	case KEY_END:
9575 		view->count = 0;
9576 		if (s->eof)
9577 			break;
9578 		s->first_displayed_line = (s->nlines - eos) + 3;
9579 		s->eof = 1;
9580 		break;
9581 	case 'k':
9582 	case KEY_UP:
9583 		if (s->first_displayed_line > 1)
9584 			--s->first_displayed_line;
9585 		else
9586 			view->count = 0;
9587 		break;
9588 	case CTRL('u'):
9589 	case 'u':
9590 		nscroll /= 2;
9591 		/* FALL THROUGH */
9592 	case KEY_PPAGE:
9593 	case CTRL('b'):
9594 	case 'b':
9595 		if (s->first_displayed_line == 1) {
9596 			view->count = 0;
9597 			break;
9598 		}
9599 		while (--nscroll > 0 && s->first_displayed_line > 1)
9600 			s->first_displayed_line--;
9601 		break;
9602 	case 'j':
9603 	case KEY_DOWN:
9604 	case CTRL('n'):
9605 		if (!s->eof)
9606 			++s->first_displayed_line;
9607 		else
9608 			view->count = 0;
9609 		break;
9610 	case CTRL('d'):
9611 	case 'd':
9612 		nscroll /= 2;
9613 		/* FALL THROUGH */
9614 	case KEY_NPAGE:
9615 	case CTRL('f'):
9616 	case 'f':
9617 	case ' ':
9618 		if (s->eof) {
9619 			view->count = 0;
9620 			break;
9621 		}
9622 		while (!s->eof && --nscroll > 0) {
9623 			linelen = getline(&line, &linesz, s->f);
9624 			s->first_displayed_line++;
9625 			if (linelen == -1) {
9626 				if (feof(s->f))
9627 					s->eof = 1;
9628 				else
9629 					err = got_ferror(s->f, GOT_ERR_IO);
9630 				break;
9631 			}
9632 		}
9633 		free(line);
9634 		break;
9635 	default:
9636 		view->count = 0;
9637 		break;
9638 	}
9639 
9640 	return err;
9641 }
9642 
9643 static const struct got_error *
9644 close_help_view(struct tog_view *view)
9645 {
9646 	struct tog_help_view_state *s = &view->state.help;
9647 
9648 	free(s->line_offsets);
9649 	s->line_offsets = NULL;
9650 	if (fclose(s->f) == EOF)
9651 		return got_error_from_errno("fclose");
9652 
9653 	return NULL;
9654 }
9655 
9656 static const struct got_error *
9657 reset_help_view(struct tog_view *view)
9658 {
9659 	struct tog_help_view_state *s = &view->state.help;
9660 
9661 
9662 	if (s->f && fclose(s->f) == EOF)
9663 		return got_error_from_errno("fclose");
9664 
9665 	wclear(view->window);
9666 	view->count = 0;
9667 	view->x = 0;
9668 	s->all = !s->all;
9669 	s->first_displayed_line = 1;
9670 	s->last_displayed_line = view->nlines;
9671 	s->matched_line = 0;
9672 
9673 	return create_help(s);
9674 }
9675 
9676 static const struct got_error *
9677 open_help_view(struct tog_view *view, struct tog_view *parent)
9678 {
9679 	const struct got_error		*err = NULL;
9680 	struct tog_help_view_state	*s = &view->state.help;
9681 
9682 	s->type = (enum tog_keymap_type)parent->type;
9683 	s->first_displayed_line = 1;
9684 	s->last_displayed_line = view->nlines;
9685 	s->selected_line = 1;
9686 
9687 	view->show = show_help_view;
9688 	view->input = input_help_view;
9689 	view->reset = reset_help_view;
9690 	view->close = close_help_view;
9691 	view->search_start = search_start_help_view;
9692 	view->search_setup = search_setup_help_view;
9693 	view->search_next = search_next_view_match;
9694 
9695 	err = create_help(s);
9696 	return err;
9697 }
9698 
9699 static const struct got_error *
9700 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9701     enum tog_view_type request, int y, int x)
9702 {
9703 	const struct got_error *err = NULL;
9704 
9705 	*new_view = NULL;
9706 
9707 	switch (request) {
9708 	case TOG_VIEW_DIFF:
9709 		if (view->type == TOG_VIEW_LOG) {
9710 			struct tog_log_view_state *s = &view->state.log;
9711 
9712 			err = open_diff_view_for_commit(new_view, y, x,
9713 			    s->selected_entry->commit, s->selected_entry->id,
9714 			    view, s->repo);
9715 		} else
9716 			return got_error_msg(GOT_ERR_NOT_IMPL,
9717 			    "parent/child view pair not supported");
9718 		break;
9719 	case TOG_VIEW_BLAME:
9720 		if (view->type == TOG_VIEW_TREE) {
9721 			struct tog_tree_view_state *s = &view->state.tree;
9722 
9723 			err = blame_tree_entry(new_view, y, x,
9724 			    s->selected_entry, &s->parents, s->commit_id,
9725 			    s->repo);
9726 		} else
9727 			return got_error_msg(GOT_ERR_NOT_IMPL,
9728 			    "parent/child view pair not supported");
9729 		break;
9730 	case TOG_VIEW_LOG:
9731 		if (view->type == TOG_VIEW_BLAME)
9732 			err = log_annotated_line(new_view, y, x,
9733 			    view->state.blame.repo, view->state.blame.id_to_log);
9734 		else if (view->type == TOG_VIEW_TREE)
9735 			err = log_selected_tree_entry(new_view, y, x,
9736 			    &view->state.tree);
9737 		else if (view->type == TOG_VIEW_REF)
9738 			err = log_ref_entry(new_view, y, x,
9739 			    view->state.ref.selected_entry,
9740 			    view->state.ref.repo);
9741 		else
9742 			return got_error_msg(GOT_ERR_NOT_IMPL,
9743 			    "parent/child view pair not supported");
9744 		break;
9745 	case TOG_VIEW_TREE:
9746 		if (view->type == TOG_VIEW_LOG)
9747 			err = browse_commit_tree(new_view, y, x,
9748 			    view->state.log.selected_entry,
9749 			    view->state.log.in_repo_path,
9750 			    view->state.log.head_ref_name,
9751 			    view->state.log.repo);
9752 		else if (view->type == TOG_VIEW_REF)
9753 			err = browse_ref_tree(new_view, y, x,
9754 			    view->state.ref.selected_entry,
9755 			    view->state.ref.repo);
9756 		else
9757 			return got_error_msg(GOT_ERR_NOT_IMPL,
9758 			    "parent/child view pair not supported");
9759 		break;
9760 	case TOG_VIEW_REF:
9761 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9762 		if (*new_view == NULL)
9763 			return got_error_from_errno("view_open");
9764 		if (view->type == TOG_VIEW_LOG)
9765 			err = open_ref_view(*new_view, view->state.log.repo);
9766 		else if (view->type == TOG_VIEW_TREE)
9767 			err = open_ref_view(*new_view, view->state.tree.repo);
9768 		else
9769 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9770 			    "parent/child view pair not supported");
9771 		if (err)
9772 			view_close(*new_view);
9773 		break;
9774 	case TOG_VIEW_HELP:
9775 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9776 		if (*new_view == NULL)
9777 			return got_error_from_errno("view_open");
9778 		err = open_help_view(*new_view, view);
9779 		if (err)
9780 			view_close(*new_view);
9781 		break;
9782 	default:
9783 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9784 	}
9785 
9786 	return err;
9787 }
9788 
9789 /*
9790  * If view was scrolled down to move the selected line into view when opening a
9791  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9792  */
9793 static void
9794 offset_selection_up(struct tog_view *view)
9795 {
9796 	switch (view->type) {
9797 	case TOG_VIEW_BLAME: {
9798 		struct tog_blame_view_state *s = &view->state.blame;
9799 		if (s->first_displayed_line == 1) {
9800 			s->selected_line = MAX(s->selected_line - view->offset,
9801 			    1);
9802 			break;
9803 		}
9804 		if (s->first_displayed_line > view->offset)
9805 			s->first_displayed_line -= view->offset;
9806 		else
9807 			s->first_displayed_line = 1;
9808 		s->selected_line += view->offset;
9809 		break;
9810 	}
9811 	case TOG_VIEW_LOG:
9812 		log_scroll_up(&view->state.log, view->offset);
9813 		view->state.log.selected += view->offset;
9814 		break;
9815 	case TOG_VIEW_REF:
9816 		ref_scroll_up(&view->state.ref, view->offset);
9817 		view->state.ref.selected += view->offset;
9818 		break;
9819 	case TOG_VIEW_TREE:
9820 		tree_scroll_up(&view->state.tree, view->offset);
9821 		view->state.tree.selected += view->offset;
9822 		break;
9823 	default:
9824 		break;
9825 	}
9826 
9827 	view->offset = 0;
9828 }
9829 
9830 /*
9831  * If the selected line is in the section of screen covered by the bottom split,
9832  * scroll down offset lines to move it into view and index its new position.
9833  */
9834 static const struct got_error *
9835 offset_selection_down(struct tog_view *view)
9836 {
9837 	const struct got_error	*err = NULL;
9838 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9839 	int			*selected = NULL;
9840 	int			 header, offset;
9841 
9842 	switch (view->type) {
9843 	case TOG_VIEW_BLAME: {
9844 		struct tog_blame_view_state *s = &view->state.blame;
9845 		header = 3;
9846 		scrolld = NULL;
9847 		if (s->selected_line > view->nlines - header) {
9848 			offset = abs(view->nlines - s->selected_line - header);
9849 			s->first_displayed_line += offset;
9850 			s->selected_line -= offset;
9851 			view->offset = offset;
9852 		}
9853 		break;
9854 	}
9855 	case TOG_VIEW_LOG: {
9856 		struct tog_log_view_state *s = &view->state.log;
9857 		scrolld = &log_scroll_down;
9858 		header = view_is_parent_view(view) ? 3 : 2;
9859 		selected = &s->selected;
9860 		break;
9861 	}
9862 	case TOG_VIEW_REF: {
9863 		struct tog_ref_view_state *s = &view->state.ref;
9864 		scrolld = &ref_scroll_down;
9865 		header = 3;
9866 		selected = &s->selected;
9867 		break;
9868 	}
9869 	case TOG_VIEW_TREE: {
9870 		struct tog_tree_view_state *s = &view->state.tree;
9871 		scrolld = &tree_scroll_down;
9872 		header = 5;
9873 		selected = &s->selected;
9874 		break;
9875 	}
9876 	default:
9877 		selected = NULL;
9878 		scrolld = NULL;
9879 		header = 0;
9880 		break;
9881 	}
9882 
9883 	if (selected && *selected > view->nlines - header) {
9884 		offset = abs(view->nlines - *selected - header);
9885 		view->offset = offset;
9886 		if (scrolld && offset) {
9887 			err = scrolld(view, offset);
9888 			*selected -= offset;
9889 		}
9890 	}
9891 
9892 	return err;
9893 }
9894 
9895 static void
9896 list_commands(FILE *fp)
9897 {
9898 	size_t i;
9899 
9900 	fprintf(fp, "commands:");
9901 	for (i = 0; i < nitems(tog_commands); i++) {
9902 		const struct tog_cmd *cmd = &tog_commands[i];
9903 		fprintf(fp, " %s", cmd->name);
9904 	}
9905 	fputc('\n', fp);
9906 }
9907 
9908 __dead static void
9909 usage(int hflag, int status)
9910 {
9911 	FILE *fp = (status == 0) ? stdout : stderr;
9912 
9913 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9914 	    getprogname());
9915 	if (hflag) {
9916 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9917 		list_commands(fp);
9918 	}
9919 	exit(status);
9920 }
9921 
9922 static char **
9923 make_argv(int argc, ...)
9924 {
9925 	va_list ap;
9926 	char **argv;
9927 	int i;
9928 
9929 	va_start(ap, argc);
9930 
9931 	argv = calloc(argc, sizeof(char *));
9932 	if (argv == NULL)
9933 		err(1, "calloc");
9934 	for (i = 0; i < argc; i++) {
9935 		argv[i] = strdup(va_arg(ap, char *));
9936 		if (argv[i] == NULL)
9937 			err(1, "strdup");
9938 	}
9939 
9940 	va_end(ap);
9941 	return argv;
9942 }
9943 
9944 /*
9945  * Try to convert 'tog path' into a 'tog log path' command.
9946  * The user could simply have mistyped the command rather than knowingly
9947  * provided a path. So check whether argv[0] can in fact be resolved
9948  * to a path in the HEAD commit and print a special error if not.
9949  * This hack is for mpi@ <3
9950  */
9951 static const struct got_error *
9952 tog_log_with_path(int argc, char *argv[])
9953 {
9954 	const struct got_error *error = NULL, *close_err;
9955 	const struct tog_cmd *cmd = NULL;
9956 	struct got_repository *repo = NULL;
9957 	struct got_worktree *worktree = NULL;
9958 	struct got_object_id *commit_id = NULL, *id = NULL;
9959 	struct got_commit_object *commit = NULL;
9960 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9961 	char *commit_id_str = NULL, **cmd_argv = NULL;
9962 	int *pack_fds = NULL;
9963 
9964 	cwd = getcwd(NULL, 0);
9965 	if (cwd == NULL)
9966 		return got_error_from_errno("getcwd");
9967 
9968 	error = got_repo_pack_fds_open(&pack_fds);
9969 	if (error != NULL)
9970 		goto done;
9971 
9972 	error = got_worktree_open(&worktree, cwd, NULL);
9973 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9974 		goto done;
9975 
9976 	if (worktree)
9977 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9978 	else
9979 		repo_path = strdup(cwd);
9980 	if (repo_path == NULL) {
9981 		error = got_error_from_errno("strdup");
9982 		goto done;
9983 	}
9984 
9985 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9986 	if (error != NULL)
9987 		goto done;
9988 
9989 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9990 	    repo, worktree);
9991 	if (error)
9992 		goto done;
9993 
9994 	error = tog_load_refs(repo, 0);
9995 	if (error)
9996 		goto done;
9997 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9998 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9999 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
10000 	if (error)
10001 		goto done;
10002 
10003 	if (worktree) {
10004 		got_worktree_close(worktree);
10005 		worktree = NULL;
10006 	}
10007 
10008 	error = got_object_open_as_commit(&commit, repo, commit_id);
10009 	if (error)
10010 		goto done;
10011 
10012 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10013 	if (error) {
10014 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10015 			goto done;
10016 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10017 		    getprogname(), argv[0]);
10018 		usage(1, 1);
10019 		/* not reached */
10020 	}
10021 
10022 	error = got_object_id_str(&commit_id_str, commit_id);
10023 	if (error)
10024 		goto done;
10025 
10026 	cmd = &tog_commands[0]; /* log */
10027 	argc = 4;
10028 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10029 	error = cmd->cmd_main(argc, cmd_argv);
10030 done:
10031 	if (repo) {
10032 		close_err = got_repo_close(repo);
10033 		if (error == NULL)
10034 			error = close_err;
10035 	}
10036 	if (commit)
10037 		got_object_commit_close(commit);
10038 	if (worktree)
10039 		got_worktree_close(worktree);
10040 	if (pack_fds) {
10041 		const struct got_error *pack_err =
10042 		    got_repo_pack_fds_close(pack_fds);
10043 		if (error == NULL)
10044 			error = pack_err;
10045 	}
10046 	free(id);
10047 	free(commit_id_str);
10048 	free(commit_id);
10049 	free(cwd);
10050 	free(repo_path);
10051 	free(in_repo_path);
10052 	if (cmd_argv) {
10053 		int i;
10054 		for (i = 0; i < argc; i++)
10055 			free(cmd_argv[i]);
10056 		free(cmd_argv);
10057 	}
10058 	tog_free_refs();
10059 	return error;
10060 }
10061 
10062 int
10063 main(int argc, char *argv[])
10064 {
10065 	const struct got_error *io_err, *error = NULL;
10066 	const struct tog_cmd *cmd = NULL;
10067 	int ch, hflag = 0, Vflag = 0;
10068 	char **cmd_argv = NULL;
10069 	static const struct option longopts[] = {
10070 	    { "version", no_argument, NULL, 'V' },
10071 	    { NULL, 0, NULL, 0}
10072 	};
10073 	char *diff_algo_str = NULL;
10074 	const char *test_script_path;
10075 
10076 	setlocale(LC_CTYPE, "");
10077 
10078 	/*
10079 	 * Override default signal handlers before starting ncurses.
10080 	 * This should prevent ncurses from installing its own
10081 	 * broken cleanup() signal handler.
10082 	 */
10083 	signal(SIGWINCH, tog_sigwinch);
10084 	signal(SIGPIPE, tog_sigpipe);
10085 	signal(SIGCONT, tog_sigcont);
10086 	signal(SIGINT, tog_sigint);
10087 	signal(SIGTERM, tog_sigterm);
10088 
10089 	/*
10090 	 * Test mode init must happen before pledge() because "tty" will
10091 	 * not allow TTY-related ioctls to occur via regular files.
10092 	 */
10093 	test_script_path = getenv("TOG_TEST_SCRIPT");
10094 	if (test_script_path != NULL) {
10095 		error = init_mock_term(test_script_path);
10096 		if (error) {
10097 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10098 			return 1;
10099 		}
10100 	} else if (!isatty(STDIN_FILENO))
10101 		errx(1, "standard input is not a tty");
10102 
10103 #if !defined(PROFILE)
10104 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10105 	    NULL) == -1)
10106 		err(1, "pledge");
10107 #endif
10108 
10109 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10110 		switch (ch) {
10111 		case 'h':
10112 			hflag = 1;
10113 			break;
10114 		case 'V':
10115 			Vflag = 1;
10116 			break;
10117 		default:
10118 			usage(hflag, 1);
10119 			/* NOTREACHED */
10120 		}
10121 	}
10122 
10123 	argc -= optind;
10124 	argv += optind;
10125 	optind = 1;
10126 	optreset = 1;
10127 
10128 	if (Vflag) {
10129 		got_version_print_str();
10130 		return 0;
10131 	}
10132 
10133 	if (argc == 0) {
10134 		if (hflag)
10135 			usage(hflag, 0);
10136 		/* Build an argument vector which runs a default command. */
10137 		cmd = &tog_commands[0];
10138 		argc = 1;
10139 		cmd_argv = make_argv(argc, cmd->name);
10140 	} else {
10141 		size_t i;
10142 
10143 		/* Did the user specify a command? */
10144 		for (i = 0; i < nitems(tog_commands); i++) {
10145 			if (strncmp(tog_commands[i].name, argv[0],
10146 			    strlen(argv[0])) == 0) {
10147 				cmd = &tog_commands[i];
10148 				break;
10149 			}
10150 		}
10151 	}
10152 
10153 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10154 	if (diff_algo_str) {
10155 		if (strcasecmp(diff_algo_str, "patience") == 0)
10156 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10157 		if (strcasecmp(diff_algo_str, "myers") == 0)
10158 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10159 	}
10160 
10161 	tog_base_commit.idx = -1;
10162 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10163 
10164 	if (cmd == NULL) {
10165 		if (argc != 1)
10166 			usage(0, 1);
10167 		/* No command specified; try log with a path */
10168 		error = tog_log_with_path(argc, argv);
10169 	} else {
10170 		if (hflag)
10171 			cmd->cmd_usage();
10172 		else
10173 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10174 	}
10175 
10176 	if (using_mock_io) {
10177 		io_err = tog_io_close();
10178 		if (error == NULL)
10179 			error = io_err;
10180 	}
10181 	endwin();
10182 	if (cmd_argv) {
10183 		int i;
10184 		for (i = 0; i < argc; i++)
10185 			free(cmd_argv[i]);
10186 		free(cmd_argv);
10187 	}
10188 
10189 	if (error && error->code != GOT_ERR_CANCELLED &&
10190 	    error->code != GOT_ERR_EOF &&
10191 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10192 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10193 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10194 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10195 		return 1;
10196 	}
10197 	return 0;
10198 }