1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static struct {
155 	struct got_object_id	*id;
156 	int			 idx;
157 	char			 marker;
158 } tog_base_commit;
159 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
160 
161 static const struct got_error *
162 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
163     struct got_reference* re2)
164 {
165 	const char *name1 = got_ref_get_name(re1);
166 	const char *name2 = got_ref_get_name(re2);
167 	int isbackup1, isbackup2;
168 
169 	/* Sort backup refs towards the bottom of the list. */
170 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
171 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
172 	if (!isbackup1 && isbackup2) {
173 		*cmp = -1;
174 		return NULL;
175 	} else if (isbackup1 && !isbackup2) {
176 		*cmp = 1;
177 		return NULL;
178 	}
179 
180 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 tog_load_refs(struct got_repository *repo, int sort_by_date)
186 {
187 	const struct got_error *err;
188 
189 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
190 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
191 	    repo);
192 	if (err)
193 		return err;
194 
195 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
196 	    repo);
197 }
198 
199 static void
200 tog_free_refs(void)
201 {
202 	if (tog_refs_idmap) {
203 		got_reflist_object_id_map_free(tog_refs_idmap);
204 		tog_refs_idmap = NULL;
205 	}
206 	got_ref_list_free(&tog_refs);
207 }
208 
209 static const struct got_error *
210 add_color(struct tog_colors *colors, const char *pattern,
211     int idx, short color)
212 {
213 	const struct got_error *err = NULL;
214 	struct tog_color *tc;
215 	int regerr = 0;
216 
217 	if (idx < 1 || idx > COLOR_PAIRS - 1)
218 		return NULL;
219 
220 	init_pair(idx, color, -1);
221 
222 	tc = calloc(1, sizeof(*tc));
223 	if (tc == NULL)
224 		return got_error_from_errno("calloc");
225 	regerr = regcomp(&tc->regex, pattern,
226 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
227 	if (regerr) {
228 		static char regerr_msg[512];
229 		static char err_msg[512];
230 		regerror(regerr, &tc->regex, regerr_msg,
231 		    sizeof(regerr_msg));
232 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
233 		    regerr_msg);
234 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
235 		free(tc);
236 		return err;
237 	}
238 	tc->colorpair = idx;
239 	STAILQ_INSERT_HEAD(colors, tc, entry);
240 	return NULL;
241 }
242 
243 static void
244 free_colors(struct tog_colors *colors)
245 {
246 	struct tog_color *tc;
247 
248 	while (!STAILQ_EMPTY(colors)) {
249 		tc = STAILQ_FIRST(colors);
250 		STAILQ_REMOVE_HEAD(colors, entry);
251 		regfree(&tc->regex);
252 		free(tc);
253 	}
254 }
255 
256 static struct tog_color *
257 get_color(struct tog_colors *colors, int colorpair)
258 {
259 	struct tog_color *tc = NULL;
260 
261 	STAILQ_FOREACH(tc, colors, entry) {
262 		if (tc->colorpair == colorpair)
263 			return tc;
264 	}
265 
266 	return NULL;
267 }
268 
269 static int
270 default_color_value(const char *envvar)
271 {
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
273 		return COLOR_MAGENTA;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
283 		return COLOR_MAGENTA;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
291 		return COLOR_CYAN;
292 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
295 		return COLOR_GREEN;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
297 		return COLOR_MAGENTA;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
299 		return COLOR_YELLOW;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
301 		return COLOR_CYAN;
302 
303 	return -1;
304 }
305 
306 static int
307 get_color_value(const char *envvar)
308 {
309 	const char *val = getenv(envvar);
310 
311 	if (val == NULL)
312 		return default_color_value(envvar);
313 
314 	if (strcasecmp(val, "black") == 0)
315 		return COLOR_BLACK;
316 	if (strcasecmp(val, "red") == 0)
317 		return COLOR_RED;
318 	if (strcasecmp(val, "green") == 0)
319 		return COLOR_GREEN;
320 	if (strcasecmp(val, "yellow") == 0)
321 		return COLOR_YELLOW;
322 	if (strcasecmp(val, "blue") == 0)
323 		return COLOR_BLUE;
324 	if (strcasecmp(val, "magenta") == 0)
325 		return COLOR_MAGENTA;
326 	if (strcasecmp(val, "cyan") == 0)
327 		return COLOR_CYAN;
328 	if (strcasecmp(val, "white") == 0)
329 		return COLOR_WHITE;
330 	if (strcasecmp(val, "default") == 0)
331 		return -1;
332 
333 	return default_color_value(envvar);
334 }
335 
336 struct tog_diff_view_state {
337 	struct got_object_id *id1, *id2;
338 	const char *label1, *label2;
339 	FILE *f, *f1, *f2;
340 	int fd1, fd2;
341 	int lineno;
342 	int first_displayed_line;
343 	int last_displayed_line;
344 	int eof;
345 	int diff_context;
346 	int ignore_whitespace;
347 	int force_text_diff;
348 	struct got_repository *repo;
349 	struct got_diff_line *lines;
350 	size_t nlines;
351 	int matched_line;
352 	int selected_line;
353 
354 	/* passed from log or blame view; may be NULL */
355 	struct tog_view *parent_view;
356 };
357 
358 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
359 static volatile sig_atomic_t tog_thread_error;
360 
361 struct tog_log_thread_args {
362 	pthread_cond_t need_commits;
363 	pthread_cond_t commit_loaded;
364 	int commits_needed;
365 	int load_all;
366 	struct got_commit_graph *graph;
367 	struct commit_queue *real_commits;
368 	const char *in_repo_path;
369 	struct got_object_id *start_id;
370 	struct got_repository *repo;
371 	int *pack_fds;
372 	int log_complete;
373 	pthread_cond_t log_loaded;
374 	sig_atomic_t *quit;
375 	struct commit_queue_entry **first_displayed_entry;
376 	struct commit_queue_entry **selected_entry;
377 	int *searching;
378 	int *search_next_done;
379 	regex_t *regex;
380 	int *limiting;
381 	int limit_match;
382 	regex_t *limit_regex;
383 	struct commit_queue *limit_commits;
384 	struct got_worktree *worktree;
385 	int need_commit_marker;
386 };
387 
388 struct tog_log_view_state {
389 	struct commit_queue *commits;
390 	struct commit_queue_entry *first_displayed_entry;
391 	struct commit_queue_entry *last_displayed_entry;
392 	struct commit_queue_entry *selected_entry;
393 	struct commit_queue real_commits;
394 	int selected;
395 	char *in_repo_path;
396 	char *head_ref_name;
397 	int log_branches;
398 	struct got_repository *repo;
399 	struct got_object_id *start_id;
400 	sig_atomic_t quit;
401 	pthread_t thread;
402 	struct tog_log_thread_args thread_args;
403 	struct commit_queue_entry *matched_entry;
404 	struct commit_queue_entry *search_entry;
405 	struct tog_colors colors;
406 	int use_committer;
407 	int limit_view;
408 	regex_t limit_regex;
409 	struct commit_queue limit_commits;
410 };
411 
412 #define TOG_COLOR_DIFF_MINUS		1
413 #define TOG_COLOR_DIFF_PLUS		2
414 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
415 #define TOG_COLOR_DIFF_META		4
416 #define TOG_COLOR_TREE_SUBMODULE	5
417 #define TOG_COLOR_TREE_SYMLINK		6
418 #define TOG_COLOR_TREE_DIRECTORY	7
419 #define TOG_COLOR_TREE_EXECUTABLE	8
420 #define TOG_COLOR_COMMIT		9
421 #define TOG_COLOR_AUTHOR		10
422 #define TOG_COLOR_DATE			11
423 #define TOG_COLOR_REFS_HEADS		12
424 #define TOG_COLOR_REFS_TAGS		13
425 #define TOG_COLOR_REFS_REMOTES		14
426 #define TOG_COLOR_REFS_BACKUP		15
427 
428 struct tog_blame_cb_args {
429 	struct tog_blame_line *lines; /* one per line */
430 	int nlines;
431 
432 	struct tog_view *view;
433 	struct got_object_id *commit_id;
434 	int *quit;
435 };
436 
437 struct tog_blame_thread_args {
438 	const char *path;
439 	struct got_repository *repo;
440 	struct tog_blame_cb_args *cb_args;
441 	int *complete;
442 	got_cancel_cb cancel_cb;
443 	void *cancel_arg;
444 	pthread_cond_t blame_complete;
445 };
446 
447 struct tog_blame {
448 	FILE *f;
449 	off_t filesize;
450 	struct tog_blame_line *lines;
451 	int nlines;
452 	off_t *line_offsets;
453 	pthread_t thread;
454 	struct tog_blame_thread_args thread_args;
455 	struct tog_blame_cb_args cb_args;
456 	const char *path;
457 	int *pack_fds;
458 };
459 
460 struct tog_blame_view_state {
461 	int first_displayed_line;
462 	int last_displayed_line;
463 	int selected_line;
464 	int last_diffed_line;
465 	int blame_complete;
466 	int eof;
467 	int done;
468 	struct got_object_id_queue blamed_commits;
469 	struct got_object_qid *blamed_commit;
470 	char *path;
471 	struct got_repository *repo;
472 	struct got_object_id *commit_id;
473 	struct got_object_id *id_to_log;
474 	struct tog_blame blame;
475 	int matched_line;
476 	struct tog_colors colors;
477 };
478 
479 struct tog_parent_tree {
480 	TAILQ_ENTRY(tog_parent_tree) entry;
481 	struct got_tree_object *tree;
482 	struct got_tree_entry *first_displayed_entry;
483 	struct got_tree_entry *selected_entry;
484 	int selected;
485 };
486 
487 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
488 
489 struct tog_tree_view_state {
490 	char *tree_label;
491 	struct got_object_id *commit_id;/* commit which this tree belongs to */
492 	struct got_tree_object *root;	/* the commit's root tree entry */
493 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
494 	struct got_tree_entry *first_displayed_entry;
495 	struct got_tree_entry *last_displayed_entry;
496 	struct got_tree_entry *selected_entry;
497 	int ndisplayed, selected, show_ids;
498 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
499 	char *head_ref_name;
500 	struct got_repository *repo;
501 	struct got_tree_entry *matched_entry;
502 	struct tog_colors colors;
503 };
504 
505 struct tog_reflist_entry {
506 	TAILQ_ENTRY(tog_reflist_entry) entry;
507 	struct got_reference *ref;
508 	int idx;
509 };
510 
511 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
512 
513 struct tog_ref_view_state {
514 	struct tog_reflist_head refs;
515 	struct tog_reflist_entry *first_displayed_entry;
516 	struct tog_reflist_entry *last_displayed_entry;
517 	struct tog_reflist_entry *selected_entry;
518 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
519 	struct got_repository *repo;
520 	struct tog_reflist_entry *matched_entry;
521 	struct tog_colors colors;
522 };
523 
524 struct tog_help_view_state {
525 	FILE			*f;
526 	off_t			*line_offsets;
527 	size_t			 nlines;
528 	int			 lineno;
529 	int			 first_displayed_line;
530 	int			 last_displayed_line;
531 	int			 eof;
532 	int			 matched_line;
533 	int			 selected_line;
534 	int			 all;
535 	enum tog_keymap_type	 type;
536 };
537 
538 #define GENERATE_HELP \
539 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
540 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
541 	KEY_("k C-p Up", "Move cursor or page up one line"), \
542 	KEY_("j C-n Down", "Move cursor or page down one line"), \
543 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
544 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
545 	KEY_("C-u u", "Scroll the view up one half page"), \
546 	KEY_("C-d d", "Scroll the view down one half page"), \
547 	KEY_("g", "Go to line N (default: first line)"), \
548 	KEY_("Home =", "Go to the first line"), \
549 	KEY_("G", "Go to line N (default: last line)"), \
550 	KEY_("End *", "Go to the last line"), \
551 	KEY_("l Right", "Scroll the view right"), \
552 	KEY_("h Left", "Scroll the view left"), \
553 	KEY_("$", "Scroll view to the rightmost position"), \
554 	KEY_("0", "Scroll view to the leftmost position"), \
555 	KEY_("-", "Decrease size of the focussed split"), \
556 	KEY_("+", "Increase size of the focussed split"), \
557 	KEY_("Tab", "Switch focus between views"), \
558 	KEY_("F", "Toggle fullscreen mode"), \
559 	KEY_("S", "Switch split-screen layout"), \
560 	KEY_("/", "Open prompt to enter search term"), \
561 	KEY_("n", "Find next line/token matching the current search term"), \
562 	KEY_("N", "Find previous line/token matching the current search term"),\
563 	KEY_("q", "Quit the focussed view; Quit help screen"), \
564 	KEY_("Q", "Quit tog"), \
565 	\
566 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
567 	KEY_("< ,", "Move cursor up one commit"), \
568 	KEY_("> .", "Move cursor down one commit"), \
569 	KEY_("Enter", "Open diff view of the selected commit"), \
570 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
571 	KEY_("R", "Open ref view of all repository references"), \
572 	KEY_("T", "Display tree view of the repository from the selected" \
573 	    " commit"), \
574 	KEY_("@", "Toggle between displaying author and committer name"), \
575 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
576 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
577 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
578 	\
579 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
580 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
581 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
582 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
583 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
584 	    " data"), \
585 	KEY_("(", "Go to the previous file in the diff"), \
586 	KEY_(")", "Go to the next file in the diff"), \
587 	KEY_("{", "Go to the previous hunk in the diff"), \
588 	KEY_("}", "Go to the next hunk in the diff"), \
589 	KEY_("[", "Decrease the number of context lines"), \
590 	KEY_("]", "Increase the number of context lines"), \
591 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
592 	\
593 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
594 	KEY_("Enter", "Display diff view of the selected line's commit"), \
595 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
596 	KEY_("L", "Open log view for the currently selected annotated line"), \
597 	KEY_("C", "Reload view with the previously blamed commit"), \
598 	KEY_("c", "Reload view with the version of the file found in the" \
599 	    " selected line's commit"), \
600 	KEY_("p", "Reload view with the version of the file found in the" \
601 	    " selected line's parent commit"), \
602 	\
603 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
604 	KEY_("Enter", "Enter selected directory or open blame view of the" \
605 	    " selected file"), \
606 	KEY_("L", "Open log view for the selected entry"), \
607 	KEY_("R", "Open ref view of all repository references"), \
608 	KEY_("i", "Show object IDs for all tree entries"), \
609 	KEY_("Backspace", "Return to the parent directory"), \
610 	\
611 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
612 	KEY_("Enter", "Display log view of the selected reference"), \
613 	KEY_("T", "Display tree view of the selected reference"), \
614 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
615 	KEY_("m", "Toggle display of last modified date for each reference"), \
616 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
617 	KEY_("C-l", "Reload view with all repository references")
618 
619 struct tog_key_map {
620 	const char		*keys;
621 	const char		*info;
622 	enum tog_keymap_type	 type;
623 };
624 
625 /* curses io for tog regress */
626 struct tog_io {
627 	FILE	*cin;
628 	FILE	*cout;
629 	FILE	*f;
630 	FILE	*sdump;
631 	int	 wait_for_ui;
632 } tog_io;
633 static int using_mock_io;
634 
635 #define TOG_KEY_SCRDUMP	SHRT_MIN
636 
637 /*
638  * We implement two types of views: parent views and child views.
639  *
640  * The 'Tab' key switches focus between a parent view and its child view.
641  * Child views are shown side-by-side to their parent view, provided
642  * there is enough screen estate.
643  *
644  * When a new view is opened from within a parent view, this new view
645  * becomes a child view of the parent view, replacing any existing child.
646  *
647  * When a new view is opened from within a child view, this new view
648  * becomes a parent view which will obscure the views below until the
649  * user quits the new parent view by typing 'q'.
650  *
651  * This list of views contains parent views only.
652  * Child views are only pointed to by their parent view.
653  */
654 TAILQ_HEAD(tog_view_list_head, tog_view);
655 
656 struct tog_view {
657 	TAILQ_ENTRY(tog_view) entry;
658 	WINDOW *window;
659 	PANEL *panel;
660 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
661 	int resized_y, resized_x; /* begin_y/x based on user resizing */
662 	int maxx, x; /* max column and current start column */
663 	int lines, cols; /* copies of LINES and COLS */
664 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
665 	int gline, hiline; /* navigate to and highlight this nG line */
666 	int ch, count; /* current keymap and count prefix */
667 	int resized; /* set when in a resize event */
668 	int focussed; /* Only set on one parent or child view at a time. */
669 	int dying;
670 	struct tog_view *parent;
671 	struct tog_view *child;
672 
673 	/*
674 	 * This flag is initially set on parent views when a new child view
675 	 * is created. It gets toggled when the 'Tab' key switches focus
676 	 * between parent and child.
677 	 * The flag indicates whether focus should be passed on to our child
678 	 * view if this parent view gets picked for focus after another parent
679 	 * view was closed. This prevents child views from losing focus in such
680 	 * situations.
681 	 */
682 	int focus_child;
683 
684 	enum tog_view_mode mode;
685 	/* type-specific state */
686 	enum tog_view_type type;
687 	union {
688 		struct tog_diff_view_state diff;
689 		struct tog_log_view_state log;
690 		struct tog_blame_view_state blame;
691 		struct tog_tree_view_state tree;
692 		struct tog_ref_view_state ref;
693 		struct tog_help_view_state help;
694 	} state;
695 
696 	const struct got_error *(*show)(struct tog_view *);
697 	const struct got_error *(*input)(struct tog_view **,
698 	    struct tog_view *, int);
699 	const struct got_error *(*reset)(struct tog_view *);
700 	const struct got_error *(*resize)(struct tog_view *, int);
701 	const struct got_error *(*close)(struct tog_view *);
702 
703 	const struct got_error *(*search_start)(struct tog_view *);
704 	const struct got_error *(*search_next)(struct tog_view *);
705 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
706 	    int **, int **, int **, int **);
707 	int search_started;
708 	int searching;
709 #define TOG_SEARCH_FORWARD	1
710 #define TOG_SEARCH_BACKWARD	2
711 	int search_next_done;
712 #define TOG_SEARCH_HAVE_MORE	1
713 #define TOG_SEARCH_NO_MORE	2
714 #define TOG_SEARCH_HAVE_NONE	3
715 	regex_t regex;
716 	regmatch_t regmatch;
717 	const char *action;
718 };
719 
720 static const struct got_error *open_diff_view(struct tog_view *,
721     struct got_object_id *, struct got_object_id *,
722     const char *, const char *, int, int, int, struct tog_view *,
723     struct got_repository *);
724 static const struct got_error *show_diff_view(struct tog_view *);
725 static const struct got_error *input_diff_view(struct tog_view **,
726     struct tog_view *, int);
727 static const struct got_error *reset_diff_view(struct tog_view *);
728 static const struct got_error* close_diff_view(struct tog_view *);
729 static const struct got_error *search_start_diff_view(struct tog_view *);
730 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
731     size_t *, int **, int **, int **, int **);
732 static const struct got_error *search_next_view_match(struct tog_view *);
733 
734 static const struct got_error *open_log_view(struct tog_view *,
735     struct got_object_id *, struct got_repository *,
736     const char *, const char *, int, struct got_worktree *);
737 static const struct got_error * show_log_view(struct tog_view *);
738 static const struct got_error *input_log_view(struct tog_view **,
739     struct tog_view *, int);
740 static const struct got_error *resize_log_view(struct tog_view *, int);
741 static const struct got_error *close_log_view(struct tog_view *);
742 static const struct got_error *search_start_log_view(struct tog_view *);
743 static const struct got_error *search_next_log_view(struct tog_view *);
744 
745 static const struct got_error *open_blame_view(struct tog_view *, char *,
746     struct got_object_id *, struct got_repository *);
747 static const struct got_error *show_blame_view(struct tog_view *);
748 static const struct got_error *input_blame_view(struct tog_view **,
749     struct tog_view *, int);
750 static const struct got_error *reset_blame_view(struct tog_view *);
751 static const struct got_error *close_blame_view(struct tog_view *);
752 static const struct got_error *search_start_blame_view(struct tog_view *);
753 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
754     size_t *, int **, int **, int **, int **);
755 
756 static const struct got_error *open_tree_view(struct tog_view *,
757     struct got_object_id *, const char *, struct got_repository *);
758 static const struct got_error *show_tree_view(struct tog_view *);
759 static const struct got_error *input_tree_view(struct tog_view **,
760     struct tog_view *, int);
761 static const struct got_error *close_tree_view(struct tog_view *);
762 static const struct got_error *search_start_tree_view(struct tog_view *);
763 static const struct got_error *search_next_tree_view(struct tog_view *);
764 
765 static const struct got_error *open_ref_view(struct tog_view *,
766     struct got_repository *);
767 static const struct got_error *show_ref_view(struct tog_view *);
768 static const struct got_error *input_ref_view(struct tog_view **,
769     struct tog_view *, int);
770 static const struct got_error *close_ref_view(struct tog_view *);
771 static const struct got_error *search_start_ref_view(struct tog_view *);
772 static const struct got_error *search_next_ref_view(struct tog_view *);
773 
774 static const struct got_error *open_help_view(struct tog_view *,
775     struct tog_view *);
776 static const struct got_error *show_help_view(struct tog_view *);
777 static const struct got_error *input_help_view(struct tog_view **,
778     struct tog_view *, int);
779 static const struct got_error *reset_help_view(struct tog_view *);
780 static const struct got_error* close_help_view(struct tog_view *);
781 static const struct got_error *search_start_help_view(struct tog_view *);
782 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
783     size_t *, int **, int **, int **, int **);
784 
785 static volatile sig_atomic_t tog_sigwinch_received;
786 static volatile sig_atomic_t tog_sigpipe_received;
787 static volatile sig_atomic_t tog_sigcont_received;
788 static volatile sig_atomic_t tog_sigint_received;
789 static volatile sig_atomic_t tog_sigterm_received;
790 
791 static void
792 tog_sigwinch(int signo)
793 {
794 	tog_sigwinch_received = 1;
795 }
796 
797 static void
798 tog_sigpipe(int signo)
799 {
800 	tog_sigpipe_received = 1;
801 }
802 
803 static void
804 tog_sigcont(int signo)
805 {
806 	tog_sigcont_received = 1;
807 }
808 
809 static void
810 tog_sigint(int signo)
811 {
812 	tog_sigint_received = 1;
813 }
814 
815 static void
816 tog_sigterm(int signo)
817 {
818 	tog_sigterm_received = 1;
819 }
820 
821 static int
822 tog_fatal_signal_received(void)
823 {
824 	return (tog_sigpipe_received ||
825 	    tog_sigint_received || tog_sigterm_received);
826 }
827 
828 static const struct got_error *
829 view_close(struct tog_view *view)
830 {
831 	const struct got_error *err = NULL, *child_err = NULL;
832 
833 	if (view->child) {
834 		child_err = view_close(view->child);
835 		view->child = NULL;
836 	}
837 	if (view->close)
838 		err = view->close(view);
839 	if (view->panel)
840 		del_panel(view->panel);
841 	if (view->window)
842 		delwin(view->window);
843 	free(view);
844 	return err ? err : child_err;
845 }
846 
847 static struct tog_view *
848 view_open(int nlines, int ncols, int begin_y, int begin_x,
849     enum tog_view_type type)
850 {
851 	struct tog_view *view = calloc(1, sizeof(*view));
852 
853 	if (view == NULL)
854 		return NULL;
855 
856 	view->type = type;
857 	view->lines = LINES;
858 	view->cols = COLS;
859 	view->nlines = nlines ? nlines : LINES - begin_y;
860 	view->ncols = ncols ? ncols : COLS - begin_x;
861 	view->begin_y = begin_y;
862 	view->begin_x = begin_x;
863 	view->window = newwin(nlines, ncols, begin_y, begin_x);
864 	if (view->window == NULL) {
865 		view_close(view);
866 		return NULL;
867 	}
868 	view->panel = new_panel(view->window);
869 	if (view->panel == NULL ||
870 	    set_panel_userptr(view->panel, view) != OK) {
871 		view_close(view);
872 		return NULL;
873 	}
874 
875 	keypad(view->window, TRUE);
876 	return view;
877 }
878 
879 static int
880 view_split_begin_x(int begin_x)
881 {
882 	if (begin_x > 0 || COLS < 120)
883 		return 0;
884 	return (COLS - MAX(COLS / 2, 80));
885 }
886 
887 /* XXX Stub till we decide what to do. */
888 static int
889 view_split_begin_y(int lines)
890 {
891 	return lines * HSPLIT_SCALE;
892 }
893 
894 static const struct got_error *view_resize(struct tog_view *);
895 
896 static const struct got_error *
897 view_splitscreen(struct tog_view *view)
898 {
899 	const struct got_error *err = NULL;
900 
901 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
902 		if (view->resized_y && view->resized_y < view->lines)
903 			view->begin_y = view->resized_y;
904 		else
905 			view->begin_y = view_split_begin_y(view->nlines);
906 		view->begin_x = 0;
907 	} else if (!view->resized) {
908 		if (view->resized_x && view->resized_x < view->cols - 1 &&
909 		    view->cols > 119)
910 			view->begin_x = view->resized_x;
911 		else
912 			view->begin_x = view_split_begin_x(0);
913 		view->begin_y = 0;
914 	}
915 	view->nlines = LINES - view->begin_y;
916 	view->ncols = COLS - view->begin_x;
917 	view->lines = LINES;
918 	view->cols = COLS;
919 	err = view_resize(view);
920 	if (err)
921 		return err;
922 
923 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
924 		view->parent->nlines = view->begin_y;
925 
926 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
927 		return got_error_from_errno("mvwin");
928 
929 	return NULL;
930 }
931 
932 static const struct got_error *
933 view_fullscreen(struct tog_view *view)
934 {
935 	const struct got_error *err = NULL;
936 
937 	view->begin_x = 0;
938 	view->begin_y = view->resized ? view->begin_y : 0;
939 	view->nlines = view->resized ? view->nlines : LINES;
940 	view->ncols = COLS;
941 	view->lines = LINES;
942 	view->cols = COLS;
943 	err = view_resize(view);
944 	if (err)
945 		return err;
946 
947 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
948 		return got_error_from_errno("mvwin");
949 
950 	return NULL;
951 }
952 
953 static int
954 view_is_parent_view(struct tog_view *view)
955 {
956 	return view->parent == NULL;
957 }
958 
959 static int
960 view_is_splitscreen(struct tog_view *view)
961 {
962 	return view->begin_x > 0 || view->begin_y > 0;
963 }
964 
965 static int
966 view_is_fullscreen(struct tog_view *view)
967 {
968 	return view->nlines == LINES && view->ncols == COLS;
969 }
970 
971 static int
972 view_is_hsplit_top(struct tog_view *view)
973 {
974 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
975 	    view_is_splitscreen(view->child);
976 }
977 
978 static void
979 view_border(struct tog_view *view)
980 {
981 	PANEL *panel;
982 	const struct tog_view *view_above;
983 
984 	if (view->parent)
985 		return view_border(view->parent);
986 
987 	panel = panel_above(view->panel);
988 	if (panel == NULL)
989 		return;
990 
991 	view_above = panel_userptr(panel);
992 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
993 		mvwhline(view->window, view_above->begin_y - 1,
994 		    view->begin_x, ACS_HLINE, view->ncols);
995 	else
996 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
997 		    ACS_VLINE, view->nlines);
998 }
999 
1000 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1001 static const struct got_error *request_log_commits(struct tog_view *);
1002 static const struct got_error *offset_selection_down(struct tog_view *);
1003 static void offset_selection_up(struct tog_view *);
1004 static void view_get_split(struct tog_view *, int *, int *);
1005 
1006 static const struct got_error *
1007 view_resize(struct tog_view *view)
1008 {
1009 	const struct got_error	*err = NULL;
1010 	int			 dif, nlines, ncols;
1011 
1012 	dif = LINES - view->lines;  /* line difference */
1013 
1014 	if (view->lines > LINES)
1015 		nlines = view->nlines - (view->lines - LINES);
1016 	else
1017 		nlines = view->nlines + (LINES - view->lines);
1018 	if (view->cols > COLS)
1019 		ncols = view->ncols - (view->cols - COLS);
1020 	else
1021 		ncols = view->ncols + (COLS - view->cols);
1022 
1023 	if (view->child) {
1024 		int hs = view->child->begin_y;
1025 
1026 		if (!view_is_fullscreen(view))
1027 			view->child->begin_x = view_split_begin_x(view->begin_x);
1028 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1029 		    view->child->begin_x == 0) {
1030 			ncols = COLS;
1031 
1032 			view_fullscreen(view->child);
1033 			if (view->child->focussed)
1034 				show_panel(view->child->panel);
1035 			else
1036 				show_panel(view->panel);
1037 		} else {
1038 			ncols = view->child->begin_x;
1039 
1040 			view_splitscreen(view->child);
1041 			show_panel(view->child->panel);
1042 		}
1043 		/*
1044 		 * XXX This is ugly and needs to be moved into the above
1045 		 * logic but "works" for now and my attempts at moving it
1046 		 * break either 'tab' or 'F' key maps in horizontal splits.
1047 		 */
1048 		if (hs) {
1049 			err = view_splitscreen(view->child);
1050 			if (err)
1051 				return err;
1052 			if (dif < 0) { /* top split decreased */
1053 				err = offset_selection_down(view);
1054 				if (err)
1055 					return err;
1056 			}
1057 			view_border(view);
1058 			update_panels();
1059 			doupdate();
1060 			show_panel(view->child->panel);
1061 			nlines = view->nlines;
1062 		}
1063 	} else if (view->parent == NULL)
1064 		ncols = COLS;
1065 
1066 	if (view->resize && dif > 0) {
1067 		err = view->resize(view, dif);
1068 		if (err)
1069 			return err;
1070 	}
1071 
1072 	if (wresize(view->window, nlines, ncols) == ERR)
1073 		return got_error_from_errno("wresize");
1074 	if (replace_panel(view->panel, view->window) == ERR)
1075 		return got_error_from_errno("replace_panel");
1076 	wclear(view->window);
1077 
1078 	view->nlines = nlines;
1079 	view->ncols = ncols;
1080 	view->lines = LINES;
1081 	view->cols = COLS;
1082 
1083 	return NULL;
1084 }
1085 
1086 static const struct got_error *
1087 resize_log_view(struct tog_view *view, int increase)
1088 {
1089 	struct tog_log_view_state	*s = &view->state.log;
1090 	const struct got_error		*err = NULL;
1091 	int				 n = 0;
1092 
1093 	if (s->selected_entry)
1094 		n = s->selected_entry->idx + view->lines - s->selected;
1095 
1096 	/*
1097 	 * Request commits to account for the increased
1098 	 * height so we have enough to populate the view.
1099 	 */
1100 	if (s->commits->ncommits < n) {
1101 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1102 		err = request_log_commits(view);
1103 	}
1104 
1105 	return err;
1106 }
1107 
1108 static void
1109 view_adjust_offset(struct tog_view *view, int n)
1110 {
1111 	if (n == 0)
1112 		return;
1113 
1114 	if (view->parent && view->parent->offset) {
1115 		if (view->parent->offset + n >= 0)
1116 			view->parent->offset += n;
1117 		else
1118 			view->parent->offset = 0;
1119 	} else if (view->offset) {
1120 		if (view->offset - n >= 0)
1121 			view->offset -= n;
1122 		else
1123 			view->offset = 0;
1124 	}
1125 }
1126 
1127 static const struct got_error *
1128 view_resize_split(struct tog_view *view, int resize)
1129 {
1130 	const struct got_error	*err = NULL;
1131 	struct tog_view		*v = NULL;
1132 
1133 	if (view->parent)
1134 		v = view->parent;
1135 	else
1136 		v = view;
1137 
1138 	if (!v->child || !view_is_splitscreen(v->child))
1139 		return NULL;
1140 
1141 	v->resized = v->child->resized = resize;  /* lock for resize event */
1142 
1143 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1144 		if (v->child->resized_y)
1145 			v->child->begin_y = v->child->resized_y;
1146 		if (view->parent)
1147 			v->child->begin_y -= resize;
1148 		else
1149 			v->child->begin_y += resize;
1150 		if (v->child->begin_y < 3) {
1151 			view->count = 0;
1152 			v->child->begin_y = 3;
1153 		} else if (v->child->begin_y > LINES - 1) {
1154 			view->count = 0;
1155 			v->child->begin_y = LINES - 1;
1156 		}
1157 		v->ncols = COLS;
1158 		v->child->ncols = COLS;
1159 		view_adjust_offset(view, resize);
1160 		err = view_init_hsplit(v, v->child->begin_y);
1161 		if (err)
1162 			return err;
1163 		v->child->resized_y = v->child->begin_y;
1164 	} else {
1165 		if (v->child->resized_x)
1166 			v->child->begin_x = v->child->resized_x;
1167 		if (view->parent)
1168 			v->child->begin_x -= resize;
1169 		else
1170 			v->child->begin_x += resize;
1171 		if (v->child->begin_x < 11) {
1172 			view->count = 0;
1173 			v->child->begin_x = 11;
1174 		} else if (v->child->begin_x > COLS - 1) {
1175 			view->count = 0;
1176 			v->child->begin_x = COLS - 1;
1177 		}
1178 		v->child->resized_x = v->child->begin_x;
1179 	}
1180 
1181 	v->child->mode = v->mode;
1182 	v->child->nlines = v->lines - v->child->begin_y;
1183 	v->child->ncols = v->cols - v->child->begin_x;
1184 	v->focus_child = 1;
1185 
1186 	err = view_fullscreen(v);
1187 	if (err)
1188 		return err;
1189 	err = view_splitscreen(v->child);
1190 	if (err)
1191 		return err;
1192 
1193 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1194 		err = offset_selection_down(v->child);
1195 		if (err)
1196 			return err;
1197 	}
1198 
1199 	if (v->resize)
1200 		err = v->resize(v, 0);
1201 	else if (v->child->resize)
1202 		err = v->child->resize(v->child, 0);
1203 
1204 	v->resized = v->child->resized = 0;
1205 
1206 	return err;
1207 }
1208 
1209 static void
1210 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1211 {
1212 	struct tog_view *v = src->child ? src->child : src;
1213 
1214 	dst->resized_x = v->resized_x;
1215 	dst->resized_y = v->resized_y;
1216 }
1217 
1218 static const struct got_error *
1219 view_close_child(struct tog_view *view)
1220 {
1221 	const struct got_error *err = NULL;
1222 
1223 	if (view->child == NULL)
1224 		return NULL;
1225 
1226 	err = view_close(view->child);
1227 	view->child = NULL;
1228 	return err;
1229 }
1230 
1231 static const struct got_error *
1232 view_set_child(struct tog_view *view, struct tog_view *child)
1233 {
1234 	const struct got_error *err = NULL;
1235 
1236 	view->child = child;
1237 	child->parent = view;
1238 
1239 	err = view_resize(view);
1240 	if (err)
1241 		return err;
1242 
1243 	if (view->child->resized_x || view->child->resized_y)
1244 		err = view_resize_split(view, 0);
1245 
1246 	return err;
1247 }
1248 
1249 static const struct got_error *view_dispatch_request(struct tog_view **,
1250     struct tog_view *, enum tog_view_type, int, int);
1251 
1252 static const struct got_error *
1253 view_request_new(struct tog_view **requested, struct tog_view *view,
1254     enum tog_view_type request)
1255 {
1256 	struct tog_view		*new_view = NULL;
1257 	const struct got_error	*err;
1258 	int			 y = 0, x = 0;
1259 
1260 	*requested = NULL;
1261 
1262 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1263 		view_get_split(view, &y, &x);
1264 
1265 	err = view_dispatch_request(&new_view, view, request, y, x);
1266 	if (err)
1267 		return err;
1268 
1269 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1270 	    request != TOG_VIEW_HELP) {
1271 		err = view_init_hsplit(view, y);
1272 		if (err)
1273 			return err;
1274 	}
1275 
1276 	view->focussed = 0;
1277 	new_view->focussed = 1;
1278 	new_view->mode = view->mode;
1279 	new_view->nlines = request == TOG_VIEW_HELP ?
1280 	    view->lines : view->lines - y;
1281 
1282 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1283 		view_transfer_size(new_view, view);
1284 		err = view_close_child(view);
1285 		if (err)
1286 			return err;
1287 		err = view_set_child(view, new_view);
1288 		if (err)
1289 			return err;
1290 		view->focus_child = 1;
1291 	} else
1292 		*requested = new_view;
1293 
1294 	return NULL;
1295 }
1296 
1297 static void
1298 tog_resizeterm(void)
1299 {
1300 	int cols, lines;
1301 	struct winsize size;
1302 
1303 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1304 		cols = 80;     /* Default */
1305 		lines = 24;
1306 	} else {
1307 		cols = size.ws_col;
1308 		lines = size.ws_row;
1309 	}
1310 	resize_term(lines, cols);
1311 }
1312 
1313 static const struct got_error *
1314 view_search_start(struct tog_view *view, int fast_refresh)
1315 {
1316 	const struct got_error *err = NULL;
1317 	struct tog_view *v = view;
1318 	char pattern[1024];
1319 	int ret;
1320 
1321 	if (view->search_started) {
1322 		regfree(&view->regex);
1323 		view->searching = 0;
1324 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1325 	}
1326 	view->search_started = 0;
1327 
1328 	if (view->nlines < 1)
1329 		return NULL;
1330 
1331 	if (view_is_hsplit_top(view))
1332 		v = view->child;
1333 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1334 		v = view->parent;
1335 
1336 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1337 	wclrtoeol(v->window);
1338 
1339 	nodelay(v->window, FALSE);  /* block for search term input */
1340 	nocbreak();
1341 	echo();
1342 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1343 	wrefresh(v->window);
1344 	cbreak();
1345 	noecho();
1346 	nodelay(v->window, TRUE);
1347 	if (!fast_refresh && !using_mock_io)
1348 		halfdelay(10);
1349 	if (ret == ERR)
1350 		return NULL;
1351 
1352 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1353 		err = view->search_start(view);
1354 		if (err) {
1355 			regfree(&view->regex);
1356 			return err;
1357 		}
1358 		view->search_started = 1;
1359 		view->searching = TOG_SEARCH_FORWARD;
1360 		view->search_next_done = 0;
1361 		view->search_next(view);
1362 	}
1363 
1364 	return NULL;
1365 }
1366 
1367 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1368 static const struct got_error *
1369 switch_split(struct tog_view *view)
1370 {
1371 	const struct got_error	*err = NULL;
1372 	struct tog_view		*v = NULL;
1373 
1374 	if (view->parent)
1375 		v = view->parent;
1376 	else
1377 		v = view;
1378 
1379 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1380 		v->mode = TOG_VIEW_SPLIT_VERT;
1381 	else
1382 		v->mode = TOG_VIEW_SPLIT_HRZN;
1383 
1384 	if (!v->child)
1385 		return NULL;
1386 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1387 		v->mode = TOG_VIEW_SPLIT_NONE;
1388 
1389 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1390 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1391 		v->child->begin_y = v->child->resized_y;
1392 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1393 		v->child->begin_x = v->child->resized_x;
1394 
1395 
1396 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1397 		v->ncols = COLS;
1398 		v->child->ncols = COLS;
1399 		v->child->nscrolled = LINES - v->child->nlines;
1400 
1401 		err = view_init_hsplit(v, v->child->begin_y);
1402 		if (err)
1403 			return err;
1404 	}
1405 	v->child->mode = v->mode;
1406 	v->child->nlines = v->lines - v->child->begin_y;
1407 	v->focus_child = 1;
1408 
1409 	err = view_fullscreen(v);
1410 	if (err)
1411 		return err;
1412 	err = view_splitscreen(v->child);
1413 	if (err)
1414 		return err;
1415 
1416 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1417 		v->mode = TOG_VIEW_SPLIT_VERT;
1418 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1419 		err = offset_selection_down(v);
1420 		if (err)
1421 			return err;
1422 		err = offset_selection_down(v->child);
1423 		if (err)
1424 			return err;
1425 	} else {
1426 		offset_selection_up(v);
1427 		offset_selection_up(v->child);
1428 	}
1429 	if (v->resize)
1430 		err = v->resize(v, 0);
1431 	else if (v->child->resize)
1432 		err = v->child->resize(v->child, 0);
1433 
1434 	return err;
1435 }
1436 
1437 /*
1438  * Strip trailing whitespace from str starting at byte *n;
1439  * if *n < 0, use strlen(str). Return new str length in *n.
1440  */
1441 static void
1442 strip_trailing_ws(char *str, int *n)
1443 {
1444 	size_t x = *n;
1445 
1446 	if (str == NULL || *str == '\0')
1447 		return;
1448 
1449 	if (x < 0)
1450 		x = strlen(str);
1451 
1452 	while (x-- > 0 && isspace((unsigned char)str[x]))
1453 		str[x] = '\0';
1454 
1455 	*n = x + 1;
1456 }
1457 
1458 /*
1459  * Extract visible substring of line y from the curses screen
1460  * and strip trailing whitespace. If vline is set, overwrite
1461  * line[vline] with '|' because the ACS_VLINE character is
1462  * written out as 'x'. Write the line to file f.
1463  */
1464 static const struct got_error *
1465 view_write_line(FILE *f, int y, int vline)
1466 {
1467 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1468 	int	r, w;
1469 
1470 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1471 	if (r == ERR)
1472 		return got_error_fmt(GOT_ERR_RANGE,
1473 		    "failed to extract line %d", y);
1474 
1475 	/*
1476 	 * In some views, lines are padded with blanks to COLS width.
1477 	 * Strip them so we can diff without the -b flag when testing.
1478 	 */
1479 	strip_trailing_ws(line, &r);
1480 
1481 	if (vline > 0)
1482 		line[vline] = '|';
1483 
1484 	w = fprintf(f, "%s\n", line);
1485 	if (w != r + 1)		/* \n */
1486 		return got_ferror(f, GOT_ERR_IO);
1487 
1488 	return NULL;
1489 }
1490 
1491 /*
1492  * Capture the visible curses screen by writing each line to the
1493  * file at the path set via the TOG_SCR_DUMP environment variable.
1494  */
1495 static const struct got_error *
1496 screendump(struct tog_view *view)
1497 {
1498 	const struct got_error	*err;
1499 	int			 i;
1500 
1501 	err = got_opentemp_truncate(tog_io.sdump);
1502 	if (err)
1503 		return err;
1504 
1505 	if ((view->child && view->child->begin_x) ||
1506 	    (view->parent && view->begin_x)) {
1507 		int ncols = view->child ? view->ncols : view->parent->ncols;
1508 
1509 		/* vertical splitscreen */
1510 		for (i = 0; i < view->nlines; ++i) {
1511 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1512 			if (err)
1513 				goto done;
1514 		}
1515 	} else {
1516 		int hline = 0;
1517 
1518 		/* fullscreen or horizontal splitscreen */
1519 		if ((view->child && view->child->begin_y) ||
1520 		    (view->parent && view->begin_y))	/* hsplit */
1521 			hline = view->child ?
1522 			    view->child->begin_y : view->begin_y;
1523 
1524 		for (i = 0; i < view->lines; i++) {
1525 			if (hline && i == hline - 1) {
1526 				int c;
1527 
1528 				/* ACS_HLINE writes out as 'q', overwrite it */
1529 				for (c = 0; c < view->cols; ++c)
1530 					fputc('-', tog_io.sdump);
1531 				fputc('\n', tog_io.sdump);
1532 				continue;
1533 			}
1534 
1535 			err = view_write_line(tog_io.sdump, i, 0);
1536 			if (err)
1537 				goto done;
1538 		}
1539 	}
1540 
1541 done:
1542 	return err;
1543 }
1544 
1545 /*
1546  * Compute view->count from numeric input. Assign total to view->count and
1547  * return first non-numeric key entered.
1548  */
1549 static int
1550 get_compound_key(struct tog_view *view, int c)
1551 {
1552 	struct tog_view	*v = view;
1553 	int		 x, n = 0;
1554 
1555 	if (view_is_hsplit_top(view))
1556 		v = view->child;
1557 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1558 		v = view->parent;
1559 
1560 	view->count = 0;
1561 	cbreak();  /* block for input */
1562 	nodelay(view->window, FALSE);
1563 	wmove(v->window, v->nlines - 1, 0);
1564 	wclrtoeol(v->window);
1565 	waddch(v->window, ':');
1566 
1567 	do {
1568 		x = getcurx(v->window);
1569 		if (x != ERR && x < view->ncols) {
1570 			waddch(v->window, c);
1571 			wrefresh(v->window);
1572 		}
1573 
1574 		/*
1575 		 * Don't overflow. Max valid request should be the greatest
1576 		 * between the longest and total lines; cap at 10 million.
1577 		 */
1578 		if (n >= 9999999)
1579 			n = 9999999;
1580 		else
1581 			n = n * 10 + (c - '0');
1582 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1583 
1584 	if (c == 'G' || c == 'g') {	/* nG key map */
1585 		view->gline = view->hiline = n;
1586 		n = 0;
1587 		c = 0;
1588 	}
1589 
1590 	/* Massage excessive or inapplicable values at the input handler. */
1591 	view->count = n;
1592 
1593 	return c;
1594 }
1595 
1596 static void
1597 action_report(struct tog_view *view)
1598 {
1599 	struct tog_view *v = view;
1600 
1601 	if (view_is_hsplit_top(view))
1602 		v = view->child;
1603 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1604 		v = view->parent;
1605 
1606 	wmove(v->window, v->nlines - 1, 0);
1607 	wclrtoeol(v->window);
1608 	wprintw(v->window, ":%s", view->action);
1609 	wrefresh(v->window);
1610 
1611 	/*
1612 	 * Clear action status report. Only clear in blame view
1613 	 * once annotating is complete, otherwise it's too fast.
1614 	 */
1615 	if (view->type == TOG_VIEW_BLAME) {
1616 		if (view->state.blame.blame_complete)
1617 			view->action = NULL;
1618 	} else
1619 		view->action = NULL;
1620 }
1621 
1622 /*
1623  * Read the next line from the test script and assign
1624  * key instruction to *ch. If at EOF, set the *done flag.
1625  */
1626 static const struct got_error *
1627 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1628 {
1629 	const struct got_error	*err = NULL;
1630 	char			*line = NULL;
1631 	size_t			 linesz = 0;
1632 
1633 	if (view->count && --view->count) {
1634 		*ch = view->ch;
1635 		return NULL;
1636 	} else
1637 		*ch = -1;
1638 
1639 	if (getline(&line, &linesz, script) == -1) {
1640 		if (feof(script)) {
1641 			*done = 1;
1642 			goto done;
1643 		} else {
1644 			err = got_ferror(script, GOT_ERR_IO);
1645 			goto done;
1646 		}
1647 	}
1648 
1649 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1650 		tog_io.wait_for_ui = 1;
1651 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1652 		*ch = KEY_ENTER;
1653 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1654 		*ch = KEY_RIGHT;
1655 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1656 		*ch = KEY_LEFT;
1657 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1658 		*ch = KEY_DOWN;
1659 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1660 		*ch = KEY_UP;
1661 	else if (strncasecmp(line, "TAB", 3) == 0)
1662 		*ch = '\t';
1663 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1664 		*ch = TOG_KEY_SCRDUMP;
1665 	else if (isdigit((unsigned char)*line)) {
1666 		char *t = line;
1667 
1668 		while (isdigit((unsigned char)*t))
1669 			++t;
1670 		view->ch = *ch = *t;
1671 		*t = '\0';
1672 		/* ignore error, view->count is 0 if instruction is invalid */
1673 		view->count = strtonum(line, 0, INT_MAX, NULL);
1674 	} else
1675 		*ch = *line;
1676 
1677 done:
1678 	free(line);
1679 	return err;
1680 }
1681 
1682 static const struct got_error *
1683 view_input(struct tog_view **new, int *done, struct tog_view *view,
1684     struct tog_view_list_head *views, int fast_refresh)
1685 {
1686 	const struct got_error *err = NULL;
1687 	struct tog_view *v;
1688 	int ch, errcode;
1689 
1690 	*new = NULL;
1691 
1692 	if (view->action)
1693 		action_report(view);
1694 
1695 	/* Clear "no matches" indicator. */
1696 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1697 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1698 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1699 		view->count = 0;
1700 	}
1701 
1702 	if (view->searching && !view->search_next_done) {
1703 		errcode = pthread_mutex_unlock(&tog_mutex);
1704 		if (errcode)
1705 			return got_error_set_errno(errcode,
1706 			    "pthread_mutex_unlock");
1707 		sched_yield();
1708 		errcode = pthread_mutex_lock(&tog_mutex);
1709 		if (errcode)
1710 			return got_error_set_errno(errcode,
1711 			    "pthread_mutex_lock");
1712 		view->search_next(view);
1713 		return NULL;
1714 	}
1715 
1716 	/* Allow threads to make progress while we are waiting for input. */
1717 	errcode = pthread_mutex_unlock(&tog_mutex);
1718 	if (errcode)
1719 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1720 
1721 	if (using_mock_io) {
1722 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1723 		if (err) {
1724 			errcode = pthread_mutex_lock(&tog_mutex);
1725 			return err;
1726 		}
1727 	} else if (view->count && --view->count) {
1728 		cbreak();
1729 		nodelay(view->window, TRUE);
1730 		ch = wgetch(view->window);
1731 		/* let C-g or backspace abort unfinished count */
1732 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1733 			view->count = 0;
1734 		else
1735 			ch = view->ch;
1736 	} else {
1737 		ch = wgetch(view->window);
1738 		if (ch >= '1' && ch  <= '9')
1739 			view->ch = ch = get_compound_key(view, ch);
1740 	}
1741 	if (view->hiline && ch != ERR && ch != 0)
1742 		view->hiline = 0;  /* key pressed, clear line highlight */
1743 	nodelay(view->window, TRUE);
1744 	errcode = pthread_mutex_lock(&tog_mutex);
1745 	if (errcode)
1746 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1747 
1748 	if (tog_sigwinch_received || tog_sigcont_received) {
1749 		tog_resizeterm();
1750 		tog_sigwinch_received = 0;
1751 		tog_sigcont_received = 0;
1752 		TAILQ_FOREACH(v, views, entry) {
1753 			err = view_resize(v);
1754 			if (err)
1755 				return err;
1756 			err = v->input(new, v, KEY_RESIZE);
1757 			if (err)
1758 				return err;
1759 			if (v->child) {
1760 				err = view_resize(v->child);
1761 				if (err)
1762 					return err;
1763 				err = v->child->input(new, v->child,
1764 				    KEY_RESIZE);
1765 				if (err)
1766 					return err;
1767 				if (v->child->resized_x || v->child->resized_y) {
1768 					err = view_resize_split(v, 0);
1769 					if (err)
1770 						return err;
1771 				}
1772 			}
1773 		}
1774 	}
1775 
1776 	switch (ch) {
1777 	case '?':
1778 	case 'H':
1779 	case KEY_F(1):
1780 		if (view->type == TOG_VIEW_HELP)
1781 			err = view->reset(view);
1782 		else
1783 			err = view_request_new(new, view, TOG_VIEW_HELP);
1784 		break;
1785 	case '\t':
1786 		view->count = 0;
1787 		if (view->child) {
1788 			view->focussed = 0;
1789 			view->child->focussed = 1;
1790 			view->focus_child = 1;
1791 		} else if (view->parent) {
1792 			view->focussed = 0;
1793 			view->parent->focussed = 1;
1794 			view->parent->focus_child = 0;
1795 			if (!view_is_splitscreen(view)) {
1796 				if (view->parent->resize) {
1797 					err = view->parent->resize(view->parent,
1798 					    0);
1799 					if (err)
1800 						return err;
1801 				}
1802 				offset_selection_up(view->parent);
1803 				err = view_fullscreen(view->parent);
1804 				if (err)
1805 					return err;
1806 			}
1807 		}
1808 		break;
1809 	case 'q':
1810 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1811 			if (view->parent->resize) {
1812 				/* might need more commits to fill fullscreen */
1813 				err = view->parent->resize(view->parent, 0);
1814 				if (err)
1815 					break;
1816 			}
1817 			offset_selection_up(view->parent);
1818 		}
1819 		err = view->input(new, view, ch);
1820 		view->dying = 1;
1821 		break;
1822 	case 'Q':
1823 		*done = 1;
1824 		break;
1825 	case 'F':
1826 		view->count = 0;
1827 		if (view_is_parent_view(view)) {
1828 			if (view->child == NULL)
1829 				break;
1830 			if (view_is_splitscreen(view->child)) {
1831 				view->focussed = 0;
1832 				view->child->focussed = 1;
1833 				err = view_fullscreen(view->child);
1834 			} else {
1835 				err = view_splitscreen(view->child);
1836 				if (!err)
1837 					err = view_resize_split(view, 0);
1838 			}
1839 			if (err)
1840 				break;
1841 			err = view->child->input(new, view->child,
1842 			    KEY_RESIZE);
1843 		} else {
1844 			if (view_is_splitscreen(view)) {
1845 				view->parent->focussed = 0;
1846 				view->focussed = 1;
1847 				err = view_fullscreen(view);
1848 			} else {
1849 				err = view_splitscreen(view);
1850 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1851 					err = view_resize(view->parent);
1852 				if (!err)
1853 					err = view_resize_split(view, 0);
1854 			}
1855 			if (err)
1856 				break;
1857 			err = view->input(new, view, KEY_RESIZE);
1858 		}
1859 		if (err)
1860 			break;
1861 		if (view->resize) {
1862 			err = view->resize(view, 0);
1863 			if (err)
1864 				break;
1865 		}
1866 		if (view->parent) {
1867 			if (view->parent->resize) {
1868 				err = view->parent->resize(view->parent, 0);
1869 				if (err != NULL)
1870 					break;
1871 			}
1872 			err = offset_selection_down(view->parent);
1873 			if (err != NULL)
1874 				break;
1875 		}
1876 		err = offset_selection_down(view);
1877 		break;
1878 	case 'S':
1879 		view->count = 0;
1880 		err = switch_split(view);
1881 		break;
1882 	case '-':
1883 		err = view_resize_split(view, -1);
1884 		break;
1885 	case '+':
1886 		err = view_resize_split(view, 1);
1887 		break;
1888 	case KEY_RESIZE:
1889 		break;
1890 	case '/':
1891 		view->count = 0;
1892 		if (view->search_start)
1893 			view_search_start(view, fast_refresh);
1894 		else
1895 			err = view->input(new, view, ch);
1896 		break;
1897 	case 'N':
1898 	case 'n':
1899 		if (view->search_started && view->search_next) {
1900 			view->searching = (ch == 'n' ?
1901 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1902 			view->search_next_done = 0;
1903 			view->search_next(view);
1904 		} else
1905 			err = view->input(new, view, ch);
1906 		break;
1907 	case 'A':
1908 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1909 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1910 			view->action = "Patience diff algorithm";
1911 		} else {
1912 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1913 			view->action = "Myers diff algorithm";
1914 		}
1915 		TAILQ_FOREACH(v, views, entry) {
1916 			if (v->reset) {
1917 				err = v->reset(v);
1918 				if (err)
1919 					return err;
1920 			}
1921 			if (v->child && v->child->reset) {
1922 				err = v->child->reset(v->child);
1923 				if (err)
1924 					return err;
1925 			}
1926 		}
1927 		break;
1928 	case TOG_KEY_SCRDUMP:
1929 		err = screendump(view);
1930 		break;
1931 	default:
1932 		err = view->input(new, view, ch);
1933 		break;
1934 	}
1935 
1936 	return err;
1937 }
1938 
1939 static int
1940 view_needs_focus_indication(struct tog_view *view)
1941 {
1942 	if (view_is_parent_view(view)) {
1943 		if (view->child == NULL || view->child->focussed)
1944 			return 0;
1945 		if (!view_is_splitscreen(view->child))
1946 			return 0;
1947 	} else if (!view_is_splitscreen(view))
1948 		return 0;
1949 
1950 	return view->focussed;
1951 }
1952 
1953 static const struct got_error *
1954 tog_io_close(void)
1955 {
1956 	const struct got_error *err = NULL;
1957 
1958 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1959 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1960 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1961 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1962 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1963 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1964 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1965 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1966 
1967 	return err;
1968 }
1969 
1970 static const struct got_error *
1971 view_loop(struct tog_view *view)
1972 {
1973 	const struct got_error *err = NULL;
1974 	struct tog_view_list_head views;
1975 	struct tog_view *new_view;
1976 	char *mode;
1977 	int fast_refresh = 10;
1978 	int done = 0, errcode;
1979 
1980 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1981 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1982 		view->mode = TOG_VIEW_SPLIT_VERT;
1983 	else
1984 		view->mode = TOG_VIEW_SPLIT_HRZN;
1985 
1986 	errcode = pthread_mutex_lock(&tog_mutex);
1987 	if (errcode)
1988 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1989 
1990 	TAILQ_INIT(&views);
1991 	TAILQ_INSERT_HEAD(&views, view, entry);
1992 
1993 	view->focussed = 1;
1994 	err = view->show(view);
1995 	if (err)
1996 		return err;
1997 	update_panels();
1998 	doupdate();
1999 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2000 	    !tog_fatal_signal_received()) {
2001 		/* Refresh fast during initialization, then become slower. */
2002 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2003 			halfdelay(10); /* switch to once per second */
2004 
2005 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2006 		if (err)
2007 			break;
2008 
2009 		if (view->dying && view == TAILQ_FIRST(&views) &&
2010 		    TAILQ_NEXT(view, entry) == NULL)
2011 			done = 1;
2012 		if (done) {
2013 			struct tog_view *v;
2014 
2015 			/*
2016 			 * When we quit, scroll the screen up a single line
2017 			 * so we don't lose any information.
2018 			 */
2019 			TAILQ_FOREACH(v, &views, entry) {
2020 				wmove(v->window, 0, 0);
2021 				wdeleteln(v->window);
2022 				wnoutrefresh(v->window);
2023 				if (v->child && !view_is_fullscreen(v)) {
2024 					wmove(v->child->window, 0, 0);
2025 					wdeleteln(v->child->window);
2026 					wnoutrefresh(v->child->window);
2027 				}
2028 			}
2029 			doupdate();
2030 		}
2031 
2032 		if (view->dying) {
2033 			struct tog_view *v, *prev = NULL;
2034 
2035 			if (view_is_parent_view(view))
2036 				prev = TAILQ_PREV(view, tog_view_list_head,
2037 				    entry);
2038 			else if (view->parent)
2039 				prev = view->parent;
2040 
2041 			if (view->parent) {
2042 				view->parent->child = NULL;
2043 				view->parent->focus_child = 0;
2044 				/* Restore fullscreen line height. */
2045 				view->parent->nlines = view->parent->lines;
2046 				err = view_resize(view->parent);
2047 				if (err)
2048 					break;
2049 				/* Make resized splits persist. */
2050 				view_transfer_size(view->parent, view);
2051 			} else
2052 				TAILQ_REMOVE(&views, view, entry);
2053 
2054 			err = view_close(view);
2055 			if (err)
2056 				goto done;
2057 
2058 			view = NULL;
2059 			TAILQ_FOREACH(v, &views, entry) {
2060 				if (v->focussed)
2061 					break;
2062 			}
2063 			if (view == NULL && new_view == NULL) {
2064 				/* No view has focus. Try to pick one. */
2065 				if (prev)
2066 					view = prev;
2067 				else if (!TAILQ_EMPTY(&views)) {
2068 					view = TAILQ_LAST(&views,
2069 					    tog_view_list_head);
2070 				}
2071 				if (view) {
2072 					if (view->focus_child) {
2073 						view->child->focussed = 1;
2074 						view = view->child;
2075 					} else
2076 						view->focussed = 1;
2077 				}
2078 			}
2079 		}
2080 		if (new_view) {
2081 			struct tog_view *v, *t;
2082 			/* Only allow one parent view per type. */
2083 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2084 				if (v->type != new_view->type)
2085 					continue;
2086 				TAILQ_REMOVE(&views, v, entry);
2087 				err = view_close(v);
2088 				if (err)
2089 					goto done;
2090 				break;
2091 			}
2092 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2093 			view = new_view;
2094 		}
2095 		if (view && !done) {
2096 			if (view_is_parent_view(view)) {
2097 				if (view->child && view->child->focussed)
2098 					view = view->child;
2099 			} else {
2100 				if (view->parent && view->parent->focussed)
2101 					view = view->parent;
2102 			}
2103 			show_panel(view->panel);
2104 			if (view->child && view_is_splitscreen(view->child))
2105 				show_panel(view->child->panel);
2106 			if (view->parent && view_is_splitscreen(view)) {
2107 				err = view->parent->show(view->parent);
2108 				if (err)
2109 					goto done;
2110 			}
2111 			err = view->show(view);
2112 			if (err)
2113 				goto done;
2114 			if (view->child) {
2115 				err = view->child->show(view->child);
2116 				if (err)
2117 					goto done;
2118 			}
2119 			update_panels();
2120 			doupdate();
2121 		}
2122 	}
2123 done:
2124 	while (!TAILQ_EMPTY(&views)) {
2125 		const struct got_error *close_err;
2126 		view = TAILQ_FIRST(&views);
2127 		TAILQ_REMOVE(&views, view, entry);
2128 		close_err = view_close(view);
2129 		if (close_err && err == NULL)
2130 			err = close_err;
2131 	}
2132 
2133 	errcode = pthread_mutex_unlock(&tog_mutex);
2134 	if (errcode && err == NULL)
2135 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2136 
2137 	return err;
2138 }
2139 
2140 __dead static void
2141 usage_log(void)
2142 {
2143 	endwin();
2144 	fprintf(stderr,
2145 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2146 	    getprogname());
2147 	exit(1);
2148 }
2149 
2150 /* Create newly allocated wide-character string equivalent to a byte string. */
2151 static const struct got_error *
2152 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2153 {
2154 	char *vis = NULL;
2155 	const struct got_error *err = NULL;
2156 
2157 	*ws = NULL;
2158 	*wlen = mbstowcs(NULL, s, 0);
2159 	if (*wlen == (size_t)-1) {
2160 		int vislen;
2161 		if (errno != EILSEQ)
2162 			return got_error_from_errno("mbstowcs");
2163 
2164 		/* byte string invalid in current encoding; try to "fix" it */
2165 		err = got_mbsavis(&vis, &vislen, s);
2166 		if (err)
2167 			return err;
2168 		*wlen = mbstowcs(NULL, vis, 0);
2169 		if (*wlen == (size_t)-1) {
2170 			err = got_error_from_errno("mbstowcs"); /* give up */
2171 			goto done;
2172 		}
2173 	}
2174 
2175 	*ws = calloc(*wlen + 1, sizeof(**ws));
2176 	if (*ws == NULL) {
2177 		err = got_error_from_errno("calloc");
2178 		goto done;
2179 	}
2180 
2181 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2182 		err = got_error_from_errno("mbstowcs");
2183 done:
2184 	free(vis);
2185 	if (err) {
2186 		free(*ws);
2187 		*ws = NULL;
2188 		*wlen = 0;
2189 	}
2190 	return err;
2191 }
2192 
2193 static const struct got_error *
2194 expand_tab(char **ptr, const char *src)
2195 {
2196 	char	*dst;
2197 	size_t	 len, n, idx = 0, sz = 0;
2198 
2199 	*ptr = NULL;
2200 	n = len = strlen(src);
2201 	dst = malloc(n + 1);
2202 	if (dst == NULL)
2203 		return got_error_from_errno("malloc");
2204 
2205 	while (idx < len && src[idx]) {
2206 		const char c = src[idx];
2207 
2208 		if (c == '\t') {
2209 			size_t nb = TABSIZE - sz % TABSIZE;
2210 			char *p;
2211 
2212 			p = realloc(dst, n + nb);
2213 			if (p == NULL) {
2214 				free(dst);
2215 				return got_error_from_errno("realloc");
2216 
2217 			}
2218 			dst = p;
2219 			n += nb;
2220 			memset(dst + sz, ' ', nb);
2221 			sz += nb;
2222 		} else
2223 			dst[sz++] = src[idx];
2224 		++idx;
2225 	}
2226 
2227 	dst[sz] = '\0';
2228 	*ptr = dst;
2229 	return NULL;
2230 }
2231 
2232 /*
2233  * Advance at most n columns from wline starting at offset off.
2234  * Return the index to the first character after the span operation.
2235  * Return the combined column width of all spanned wide characters in
2236  * *rcol.
2237  */
2238 static int
2239 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2240 {
2241 	int width, i, cols = 0;
2242 
2243 	if (n == 0) {
2244 		*rcol = cols;
2245 		return off;
2246 	}
2247 
2248 	for (i = off; wline[i] != L'\0'; ++i) {
2249 		if (wline[i] == L'\t')
2250 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2251 		else
2252 			width = wcwidth(wline[i]);
2253 
2254 		if (width == -1) {
2255 			width = 1;
2256 			wline[i] = L'.';
2257 		}
2258 
2259 		if (cols + width > n)
2260 			break;
2261 		cols += width;
2262 	}
2263 
2264 	*rcol = cols;
2265 	return i;
2266 }
2267 
2268 /*
2269  * Format a line for display, ensuring that it won't overflow a width limit.
2270  * With scrolling, the width returned refers to the scrolled version of the
2271  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2272  */
2273 static const struct got_error *
2274 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2275     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2276 {
2277 	const struct got_error *err = NULL;
2278 	int cols;
2279 	wchar_t *wline = NULL;
2280 	char *exstr = NULL;
2281 	size_t wlen;
2282 	int i, scrollx;
2283 
2284 	*wlinep = NULL;
2285 	*widthp = 0;
2286 
2287 	if (expand) {
2288 		err = expand_tab(&exstr, line);
2289 		if (err)
2290 			return err;
2291 	}
2292 
2293 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2294 	free(exstr);
2295 	if (err)
2296 		return err;
2297 
2298 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2299 
2300 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2301 		wline[wlen - 1] = L'\0';
2302 		wlen--;
2303 	}
2304 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2305 		wline[wlen - 1] = L'\0';
2306 		wlen--;
2307 	}
2308 
2309 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2310 	wline[i] = L'\0';
2311 
2312 	if (widthp)
2313 		*widthp = cols;
2314 	if (scrollxp)
2315 		*scrollxp = scrollx;
2316 	if (err)
2317 		free(wline);
2318 	else
2319 		*wlinep = wline;
2320 	return err;
2321 }
2322 
2323 static const struct got_error*
2324 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2325     struct got_object_id *id, struct got_repository *repo)
2326 {
2327 	static const struct got_error *err = NULL;
2328 	struct got_reflist_entry *re;
2329 	char *s;
2330 	const char *name;
2331 
2332 	*refs_str = NULL;
2333 
2334 	if (refs == NULL)
2335 		return NULL;
2336 
2337 	TAILQ_FOREACH(re, refs, entry) {
2338 		struct got_tag_object *tag = NULL;
2339 		struct got_object_id *ref_id;
2340 		int cmp;
2341 
2342 		name = got_ref_get_name(re->ref);
2343 		if (strcmp(name, GOT_REF_HEAD) == 0)
2344 			continue;
2345 		if (strncmp(name, "refs/", 5) == 0)
2346 			name += 5;
2347 		if (strncmp(name, "got/", 4) == 0)
2348 			continue;
2349 		if (strncmp(name, "heads/", 6) == 0)
2350 			name += 6;
2351 		if (strncmp(name, "remotes/", 8) == 0) {
2352 			name += 8;
2353 			s = strstr(name, "/" GOT_REF_HEAD);
2354 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2355 				continue;
2356 		}
2357 		err = got_ref_resolve(&ref_id, repo, re->ref);
2358 		if (err)
2359 			break;
2360 		if (strncmp(name, "tags/", 5) == 0) {
2361 			err = got_object_open_as_tag(&tag, repo, ref_id);
2362 			if (err) {
2363 				if (err->code != GOT_ERR_OBJ_TYPE) {
2364 					free(ref_id);
2365 					break;
2366 				}
2367 				/* Ref points at something other than a tag. */
2368 				err = NULL;
2369 				tag = NULL;
2370 			}
2371 		}
2372 		cmp = got_object_id_cmp(tag ?
2373 		    got_object_tag_get_object_id(tag) : ref_id, id);
2374 		free(ref_id);
2375 		if (tag)
2376 			got_object_tag_close(tag);
2377 		if (cmp != 0)
2378 			continue;
2379 		s = *refs_str;
2380 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2381 		    s ? ", " : "", name) == -1) {
2382 			err = got_error_from_errno("asprintf");
2383 			free(s);
2384 			*refs_str = NULL;
2385 			break;
2386 		}
2387 		free(s);
2388 	}
2389 
2390 	return err;
2391 }
2392 
2393 static const struct got_error *
2394 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2395     int col_tab_align)
2396 {
2397 	char *smallerthan;
2398 
2399 	smallerthan = strchr(author, '<');
2400 	if (smallerthan && smallerthan[1] != '\0')
2401 		author = smallerthan + 1;
2402 	author[strcspn(author, "@>")] = '\0';
2403 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2404 	    col_tab_align, 0);
2405 }
2406 
2407 static const struct got_error *
2408 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2409     const size_t date_display_cols, int author_display_cols)
2410 {
2411 	struct tog_log_view_state *s = &view->state.log;
2412 	const struct got_error *err = NULL;
2413 	struct got_commit_object *commit = entry->commit;
2414 	struct got_object_id *id = entry->id;
2415 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2416 	char *refs_str = NULL;
2417 	char *logmsg0 = NULL, *logmsg = NULL;
2418 	char *author = NULL;
2419 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2420 	int author_width, refstr_width, logmsg_width;
2421 	char *newline, *line = NULL;
2422 	int col, limit, scrollx, logmsg_x;
2423 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2424 	struct tm tm;
2425 	time_t committer_time;
2426 	struct tog_color *tc;
2427 	struct got_reflist_head *refs;
2428 
2429 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2430 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2431 		tog_base_commit.idx = entry->idx;
2432 
2433 	committer_time = got_object_commit_get_committer_time(commit);
2434 	if (gmtime_r(&committer_time, &tm) == NULL)
2435 		return got_error_from_errno("gmtime_r");
2436 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2437 		return got_error(GOT_ERR_NO_SPACE);
2438 
2439 	if (avail <= date_display_cols)
2440 		limit = MIN(sizeof(datebuf) - 1, avail);
2441 	else
2442 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2443 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2444 	if (tc)
2445 		wattr_on(view->window,
2446 		    COLOR_PAIR(tc->colorpair), NULL);
2447 	waddnstr(view->window, datebuf, limit);
2448 	if (tc)
2449 		wattr_off(view->window,
2450 		    COLOR_PAIR(tc->colorpair), NULL);
2451 	col = limit;
2452 	if (col > avail)
2453 		goto done;
2454 
2455 	if (avail >= 120) {
2456 		char *id_str;
2457 		err = got_object_id_str(&id_str, id);
2458 		if (err)
2459 			goto done;
2460 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2461 		if (tc)
2462 			wattr_on(view->window,
2463 			    COLOR_PAIR(tc->colorpair), NULL);
2464 		wprintw(view->window, "%.8s ", id_str);
2465 		if (tc)
2466 			wattr_off(view->window,
2467 			    COLOR_PAIR(tc->colorpair), NULL);
2468 		free(id_str);
2469 		col += 9;
2470 		if (col > avail)
2471 			goto done;
2472 	}
2473 
2474 	if (s->use_committer)
2475 		author = strdup(got_object_commit_get_committer(commit));
2476 	else
2477 		author = strdup(got_object_commit_get_author(commit));
2478 	if (author == NULL) {
2479 		err = got_error_from_errno("strdup");
2480 		goto done;
2481 	}
2482 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2483 	if (err)
2484 		goto done;
2485 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2486 	if (tc)
2487 		wattr_on(view->window,
2488 		    COLOR_PAIR(tc->colorpair), NULL);
2489 	waddwstr(view->window, wauthor);
2490 	col += author_width;
2491 	while (col < avail && author_width < author_display_cols + 2) {
2492 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2493 		    author_width == marker_column &&
2494 		    entry->idx == tog_base_commit.idx) {
2495 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2496 			if (tc)
2497 				wattr_on(view->window,
2498 				    COLOR_PAIR(tc->colorpair), NULL);
2499 			waddch(view->window, tog_base_commit.marker);
2500 			if (tc)
2501 				wattr_off(view->window,
2502 				    COLOR_PAIR(tc->colorpair), NULL);
2503 		} else
2504 			waddch(view->window, ' ');
2505 		col++;
2506 		author_width++;
2507 	}
2508 	if (tc)
2509 		wattr_off(view->window,
2510 		    COLOR_PAIR(tc->colorpair), NULL);
2511 	if (col > avail)
2512 		goto done;
2513 
2514 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2515 	if (err)
2516 		goto done;
2517 	logmsg = logmsg0;
2518 	while (*logmsg == '\n')
2519 		logmsg++;
2520 	newline = strchr(logmsg, '\n');
2521 	if (newline)
2522 		*newline = '\0';
2523 
2524 	limit = avail - col;
2525 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2526 		limit--;	/* for the border */
2527 
2528 	/* Prepend reference labels to log message if possible .*/
2529 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2530 	err = build_refs_str(&refs_str, refs, id, s->repo);
2531 	if (err)
2532 		goto done;
2533 	if (refs_str) {
2534 		char *rs;
2535 
2536 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2537 			err = got_error_from_errno("asprintf");
2538 			goto done;
2539 		}
2540 		err = format_line(&wrefstr, &refstr_width,
2541 		    &scrollx, rs, view->x, limit, col, 1);
2542 		free(rs);
2543 		if (err)
2544 			goto done;
2545 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2546 		if (tc)
2547 			wattr_on(view->window,
2548 			    COLOR_PAIR(tc->colorpair), NULL);
2549 		waddwstr(view->window, &wrefstr[scrollx]);
2550 		if (tc)
2551 			wattr_off(view->window,
2552 			    COLOR_PAIR(tc->colorpair), NULL);
2553 		col += MAX(refstr_width, 0);
2554 		if (col > avail)
2555 			goto done;
2556 
2557 		if (col < avail) {
2558 			waddch(view->window, ' ');
2559 			col++;
2560 		}
2561 
2562 		if (refstr_width > 0)
2563 			logmsg_x = 0;
2564 		else {
2565 			int unscrolled_refstr_width;
2566 			size_t len = wcslen(wrefstr);
2567 
2568 			/*
2569 			 * No need to check for -1 return value here since
2570 			 * unprintables have been replaced by span_wline().
2571 			 */
2572 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2573 			unscrolled_refstr_width += 1; /* trailing space */
2574 			logmsg_x = view->x - unscrolled_refstr_width;
2575 		}
2576 
2577 		limit = avail - col;
2578 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2579 			limit--;	/* for the border */
2580 	} else
2581 		logmsg_x = view->x;
2582 
2583 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2584 	    limit, col, 1);
2585 	if (err)
2586 		goto done;
2587 	waddwstr(view->window, &wlogmsg[scrollx]);
2588 	col += MAX(logmsg_width, 0);
2589 	while (col < avail) {
2590 		waddch(view->window, ' ');
2591 		col++;
2592 	}
2593 done:
2594 	free(logmsg0);
2595 	free(wlogmsg);
2596 	free(wrefstr);
2597 	free(refs_str);
2598 	free(author);
2599 	free(wauthor);
2600 	free(line);
2601 	return err;
2602 }
2603 
2604 static struct commit_queue_entry *
2605 alloc_commit_queue_entry(struct got_commit_object *commit,
2606     struct got_object_id *id)
2607 {
2608 	struct commit_queue_entry *entry;
2609 	struct got_object_id *dup;
2610 
2611 	entry = calloc(1, sizeof(*entry));
2612 	if (entry == NULL)
2613 		return NULL;
2614 
2615 	dup = got_object_id_dup(id);
2616 	if (dup == NULL) {
2617 		free(entry);
2618 		return NULL;
2619 	}
2620 
2621 	entry->id = dup;
2622 	entry->commit = commit;
2623 	return entry;
2624 }
2625 
2626 static void
2627 pop_commit(struct commit_queue *commits)
2628 {
2629 	struct commit_queue_entry *entry;
2630 
2631 	entry = TAILQ_FIRST(&commits->head);
2632 	TAILQ_REMOVE(&commits->head, entry, entry);
2633 	got_object_commit_close(entry->commit);
2634 	commits->ncommits--;
2635 	free(entry->id);
2636 	free(entry);
2637 }
2638 
2639 static void
2640 free_commits(struct commit_queue *commits)
2641 {
2642 	while (!TAILQ_EMPTY(&commits->head))
2643 		pop_commit(commits);
2644 }
2645 
2646 static const struct got_error *
2647 match_commit(int *have_match, struct got_object_id *id,
2648     struct got_commit_object *commit, regex_t *regex)
2649 {
2650 	const struct got_error *err = NULL;
2651 	regmatch_t regmatch;
2652 	char *id_str = NULL, *logmsg = NULL;
2653 
2654 	*have_match = 0;
2655 
2656 	err = got_object_id_str(&id_str, id);
2657 	if (err)
2658 		return err;
2659 
2660 	err = got_object_commit_get_logmsg(&logmsg, commit);
2661 	if (err)
2662 		goto done;
2663 
2664 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2665 	    &regmatch, 0) == 0 ||
2666 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2667 	    &regmatch, 0) == 0 ||
2668 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2669 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2670 		*have_match = 1;
2671 done:
2672 	free(id_str);
2673 	free(logmsg);
2674 	return err;
2675 }
2676 
2677 static const struct got_error *
2678 queue_commits(struct tog_log_thread_args *a)
2679 {
2680 	const struct got_error *err = NULL;
2681 
2682 	/*
2683 	 * We keep all commits open throughout the lifetime of the log
2684 	 * view in order to avoid having to re-fetch commits from disk
2685 	 * while updating the display.
2686 	 */
2687 	do {
2688 		struct got_object_id id;
2689 		struct got_commit_object *commit;
2690 		struct commit_queue_entry *entry;
2691 		int limit_match = 0;
2692 		int errcode;
2693 
2694 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2695 		    NULL, NULL);
2696 		if (err)
2697 			break;
2698 
2699 		err = got_object_open_as_commit(&commit, a->repo, &id);
2700 		if (err)
2701 			break;
2702 		entry = alloc_commit_queue_entry(commit, &id);
2703 		if (entry == NULL) {
2704 			err = got_error_from_errno("alloc_commit_queue_entry");
2705 			break;
2706 		}
2707 
2708 		errcode = pthread_mutex_lock(&tog_mutex);
2709 		if (errcode) {
2710 			err = got_error_set_errno(errcode,
2711 			    "pthread_mutex_lock");
2712 			break;
2713 		}
2714 
2715 		entry->idx = a->real_commits->ncommits;
2716 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2717 		a->real_commits->ncommits++;
2718 
2719 		if (*a->limiting) {
2720 			err = match_commit(&limit_match, &id, commit,
2721 			    a->limit_regex);
2722 			if (err)
2723 				break;
2724 
2725 			if (limit_match) {
2726 				struct commit_queue_entry *matched;
2727 
2728 				matched = alloc_commit_queue_entry(
2729 				    entry->commit, entry->id);
2730 				if (matched == NULL) {
2731 					err = got_error_from_errno(
2732 					    "alloc_commit_queue_entry");
2733 					break;
2734 				}
2735 				matched->commit = entry->commit;
2736 				got_object_commit_retain(entry->commit);
2737 
2738 				matched->idx = a->limit_commits->ncommits;
2739 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2740 				    matched, entry);
2741 				a->limit_commits->ncommits++;
2742 			}
2743 
2744 			/*
2745 			 * This is how we signal log_thread() that we
2746 			 * have found a match, and that it should be
2747 			 * counted as a new entry for the view.
2748 			 */
2749 			a->limit_match = limit_match;
2750 		}
2751 
2752 		if (*a->searching == TOG_SEARCH_FORWARD &&
2753 		    !*a->search_next_done) {
2754 			int have_match;
2755 			err = match_commit(&have_match, &id, commit, a->regex);
2756 			if (err)
2757 				break;
2758 
2759 			if (*a->limiting) {
2760 				if (limit_match && have_match)
2761 					*a->search_next_done =
2762 					    TOG_SEARCH_HAVE_MORE;
2763 			} else if (have_match)
2764 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2765 		}
2766 
2767 		errcode = pthread_mutex_unlock(&tog_mutex);
2768 		if (errcode && err == NULL)
2769 			err = got_error_set_errno(errcode,
2770 			    "pthread_mutex_unlock");
2771 		if (err)
2772 			break;
2773 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2774 
2775 	return err;
2776 }
2777 
2778 static void
2779 select_commit(struct tog_log_view_state *s)
2780 {
2781 	struct commit_queue_entry *entry;
2782 	int ncommits = 0;
2783 
2784 	entry = s->first_displayed_entry;
2785 	while (entry) {
2786 		if (ncommits == s->selected) {
2787 			s->selected_entry = entry;
2788 			break;
2789 		}
2790 		entry = TAILQ_NEXT(entry, entry);
2791 		ncommits++;
2792 	}
2793 }
2794 
2795 static const struct got_error *
2796 draw_commits(struct tog_view *view)
2797 {
2798 	const struct got_error *err = NULL;
2799 	struct tog_log_view_state *s = &view->state.log;
2800 	struct commit_queue_entry *entry = s->selected_entry;
2801 	int limit = view->nlines;
2802 	int width;
2803 	int ncommits, author_cols = 4, refstr_cols;
2804 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2805 	char *refs_str = NULL;
2806 	wchar_t *wline;
2807 	struct tog_color *tc;
2808 	static const size_t date_display_cols = 12;
2809 	struct got_reflist_head *refs;
2810 
2811 	if (view_is_hsplit_top(view))
2812 		--limit;  /* account for border */
2813 
2814 	if (s->selected_entry &&
2815 	    !(view->searching && view->search_next_done == 0)) {
2816 		err = got_object_id_str(&id_str, s->selected_entry->id);
2817 		if (err)
2818 			return err;
2819 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2820 		    s->selected_entry->id);
2821 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2822 		    s->repo);
2823 		if (err)
2824 			goto done;
2825 	}
2826 
2827 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2828 		halfdelay(10); /* disable fast refresh */
2829 
2830 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2831 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2832 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2833 		    (view->searching && !view->search_next_done) ?
2834 		    "searching..." : "loading...") == -1) {
2835 			err = got_error_from_errno("asprintf");
2836 			goto done;
2837 		}
2838 	} else {
2839 		const char *search_str = NULL;
2840 		const char *limit_str = NULL;
2841 
2842 		if (view->searching) {
2843 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2844 				search_str = "no more matches";
2845 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2846 				search_str = "no matches found";
2847 			else if (!view->search_next_done)
2848 				search_str = "searching...";
2849 		}
2850 
2851 		if (s->limit_view && s->commits->ncommits == 0)
2852 			limit_str = "no matches found";
2853 
2854 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2855 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2856 		    search_str ? search_str : (refs_str ? refs_str : ""),
2857 		    limit_str ? limit_str : "") == -1) {
2858 			err = got_error_from_errno("asprintf");
2859 			goto done;
2860 		}
2861 	}
2862 
2863 	free(refs_str);
2864 	refs_str = NULL;
2865 
2866 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2867 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2868 		    "........................................",
2869 		    s->in_repo_path, ncommits_str) == -1) {
2870 			err = got_error_from_errno("asprintf");
2871 			header = NULL;
2872 			goto done;
2873 		}
2874 	} else if (asprintf(&header, "commit %s%s",
2875 	    id_str ? id_str : "........................................",
2876 	    ncommits_str) == -1) {
2877 		err = got_error_from_errno("asprintf");
2878 		header = NULL;
2879 		goto done;
2880 	}
2881 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2882 	if (err)
2883 		goto done;
2884 
2885 	werase(view->window);
2886 
2887 	if (view_needs_focus_indication(view))
2888 		wstandout(view->window);
2889 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2890 	if (tc)
2891 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2892 	waddwstr(view->window, wline);
2893 	while (width < view->ncols) {
2894 		waddch(view->window, ' ');
2895 		width++;
2896 	}
2897 	if (tc)
2898 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2899 	if (view_needs_focus_indication(view))
2900 		wstandend(view->window);
2901 	free(wline);
2902 	if (limit <= 1)
2903 		goto done;
2904 
2905 	/* Grow author column size if necessary, and set view->maxx. */
2906 	entry = s->first_displayed_entry;
2907 	ncommits = 0;
2908 	view->maxx = 0;
2909 	while (entry) {
2910 		struct got_commit_object *c = entry->commit;
2911 		char *author, *eol, *msg, *msg0;
2912 		wchar_t *wauthor, *wmsg;
2913 		int width;
2914 		if (ncommits >= limit - 1)
2915 			break;
2916 		if (s->use_committer)
2917 			author = strdup(got_object_commit_get_committer(c));
2918 		else
2919 			author = strdup(got_object_commit_get_author(c));
2920 		if (author == NULL) {
2921 			err = got_error_from_errno("strdup");
2922 			goto done;
2923 		}
2924 		err = format_author(&wauthor, &width, author, COLS,
2925 		    date_display_cols);
2926 		if (author_cols < width)
2927 			author_cols = width;
2928 		free(wauthor);
2929 		free(author);
2930 		if (err)
2931 			goto done;
2932 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2933 		    entry->id);
2934 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2935 		if (err)
2936 			goto done;
2937 		if (refs_str) {
2938 			wchar_t *ws;
2939 			err = format_line(&ws, &width, NULL, refs_str,
2940 			    0, INT_MAX, date_display_cols + author_cols, 0);
2941 			free(ws);
2942 			free(refs_str);
2943 			refs_str = NULL;
2944 			if (err)
2945 				goto done;
2946 			refstr_cols = width + 3; /* account for [ ] + space */
2947 		} else
2948 			refstr_cols = 0;
2949 		err = got_object_commit_get_logmsg(&msg0, c);
2950 		if (err)
2951 			goto done;
2952 		msg = msg0;
2953 		while (*msg == '\n')
2954 			++msg;
2955 		if ((eol = strchr(msg, '\n')))
2956 			*eol = '\0';
2957 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2958 		    date_display_cols + author_cols + refstr_cols, 0);
2959 		if (err)
2960 			goto done;
2961 		view->maxx = MAX(view->maxx, width + refstr_cols);
2962 		free(msg0);
2963 		free(wmsg);
2964 		ncommits++;
2965 		entry = TAILQ_NEXT(entry, entry);
2966 	}
2967 
2968 	entry = s->first_displayed_entry;
2969 	s->last_displayed_entry = s->first_displayed_entry;
2970 	ncommits = 0;
2971 	while (entry) {
2972 		if (ncommits >= limit - 1)
2973 			break;
2974 		if (ncommits == s->selected)
2975 			wstandout(view->window);
2976 		err = draw_commit(view, entry, date_display_cols, author_cols);
2977 		if (ncommits == s->selected)
2978 			wstandend(view->window);
2979 		if (err)
2980 			goto done;
2981 		ncommits++;
2982 		s->last_displayed_entry = entry;
2983 		entry = TAILQ_NEXT(entry, entry);
2984 	}
2985 
2986 	view_border(view);
2987 done:
2988 	free(id_str);
2989 	free(refs_str);
2990 	free(ncommits_str);
2991 	free(header);
2992 	return err;
2993 }
2994 
2995 static void
2996 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2997 {
2998 	struct commit_queue_entry *entry;
2999 	int nscrolled = 0;
3000 
3001 	entry = TAILQ_FIRST(&s->commits->head);
3002 	if (s->first_displayed_entry == entry)
3003 		return;
3004 
3005 	entry = s->first_displayed_entry;
3006 	while (entry && nscrolled < maxscroll) {
3007 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3008 		if (entry) {
3009 			s->first_displayed_entry = entry;
3010 			nscrolled++;
3011 		}
3012 	}
3013 }
3014 
3015 static const struct got_error *
3016 trigger_log_thread(struct tog_view *view, int wait)
3017 {
3018 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3019 	int errcode;
3020 
3021 	if (!using_mock_io)
3022 		halfdelay(1); /* fast refresh while loading commits */
3023 
3024 	while (!ta->log_complete && !tog_thread_error &&
3025 	    (ta->commits_needed > 0 || ta->load_all)) {
3026 		/* Wake the log thread. */
3027 		errcode = pthread_cond_signal(&ta->need_commits);
3028 		if (errcode)
3029 			return got_error_set_errno(errcode,
3030 			    "pthread_cond_signal");
3031 
3032 		/*
3033 		 * The mutex will be released while the view loop waits
3034 		 * in wgetch(), at which time the log thread will run.
3035 		 */
3036 		if (!wait)
3037 			break;
3038 
3039 		/* Display progress update in log view. */
3040 		show_log_view(view);
3041 		update_panels();
3042 		doupdate();
3043 
3044 		/* Wait right here while next commit is being loaded. */
3045 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3046 		if (errcode)
3047 			return got_error_set_errno(errcode,
3048 			    "pthread_cond_wait");
3049 
3050 		/* Display progress update in log view. */
3051 		show_log_view(view);
3052 		update_panels();
3053 		doupdate();
3054 	}
3055 
3056 	return NULL;
3057 }
3058 
3059 static const struct got_error *
3060 request_log_commits(struct tog_view *view)
3061 {
3062 	struct tog_log_view_state	*state = &view->state.log;
3063 	const struct got_error		*err = NULL;
3064 
3065 	if (state->thread_args.log_complete)
3066 		return NULL;
3067 
3068 	state->thread_args.commits_needed += view->nscrolled;
3069 	err = trigger_log_thread(view, 1);
3070 	view->nscrolled = 0;
3071 
3072 	return err;
3073 }
3074 
3075 static const struct got_error *
3076 log_scroll_down(struct tog_view *view, int maxscroll)
3077 {
3078 	struct tog_log_view_state *s = &view->state.log;
3079 	const struct got_error *err = NULL;
3080 	struct commit_queue_entry *pentry;
3081 	int nscrolled = 0, ncommits_needed;
3082 
3083 	if (s->last_displayed_entry == NULL)
3084 		return NULL;
3085 
3086 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3087 	if (s->commits->ncommits < ncommits_needed &&
3088 	    !s->thread_args.log_complete) {
3089 		/*
3090 		 * Ask the log thread for required amount of commits.
3091 		 */
3092 		s->thread_args.commits_needed +=
3093 		    ncommits_needed - s->commits->ncommits;
3094 		err = trigger_log_thread(view, 1);
3095 		if (err)
3096 			return err;
3097 	}
3098 
3099 	do {
3100 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3101 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3102 			break;
3103 
3104 		s->last_displayed_entry = pentry ?
3105 		    pentry : s->last_displayed_entry;
3106 
3107 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3108 		if (pentry == NULL)
3109 			break;
3110 		s->first_displayed_entry = pentry;
3111 	} while (++nscrolled < maxscroll);
3112 
3113 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3114 		view->nscrolled += nscrolled;
3115 	else
3116 		view->nscrolled = 0;
3117 
3118 	return err;
3119 }
3120 
3121 static const struct got_error *
3122 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3123     struct got_commit_object *commit, struct got_object_id *commit_id,
3124     struct tog_view *log_view, struct got_repository *repo)
3125 {
3126 	const struct got_error *err;
3127 	struct got_object_qid *parent_id;
3128 	struct tog_view *diff_view;
3129 
3130 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3131 	if (diff_view == NULL)
3132 		return got_error_from_errno("view_open");
3133 
3134 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3135 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3136 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3137 	if (err == NULL)
3138 		*new_view = diff_view;
3139 	return err;
3140 }
3141 
3142 static const struct got_error *
3143 tree_view_visit_subtree(struct tog_tree_view_state *s,
3144     struct got_tree_object *subtree)
3145 {
3146 	struct tog_parent_tree *parent;
3147 
3148 	parent = calloc(1, sizeof(*parent));
3149 	if (parent == NULL)
3150 		return got_error_from_errno("calloc");
3151 
3152 	parent->tree = s->tree;
3153 	parent->first_displayed_entry = s->first_displayed_entry;
3154 	parent->selected_entry = s->selected_entry;
3155 	parent->selected = s->selected;
3156 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3157 	s->tree = subtree;
3158 	s->selected = 0;
3159 	s->first_displayed_entry = NULL;
3160 	return NULL;
3161 }
3162 
3163 static const struct got_error *
3164 tree_view_walk_path(struct tog_tree_view_state *s,
3165     struct got_commit_object *commit, const char *path)
3166 {
3167 	const struct got_error *err = NULL;
3168 	struct got_tree_object *tree = NULL;
3169 	const char *p;
3170 	char *slash, *subpath = NULL;
3171 
3172 	/* Walk the path and open corresponding tree objects. */
3173 	p = path;
3174 	while (*p) {
3175 		struct got_tree_entry *te;
3176 		struct got_object_id *tree_id;
3177 		char *te_name;
3178 
3179 		while (p[0] == '/')
3180 			p++;
3181 
3182 		/* Ensure the correct subtree entry is selected. */
3183 		slash = strchr(p, '/');
3184 		if (slash == NULL)
3185 			te_name = strdup(p);
3186 		else
3187 			te_name = strndup(p, slash - p);
3188 		if (te_name == NULL) {
3189 			err = got_error_from_errno("strndup");
3190 			break;
3191 		}
3192 		te = got_object_tree_find_entry(s->tree, te_name);
3193 		if (te == NULL) {
3194 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3195 			free(te_name);
3196 			break;
3197 		}
3198 		free(te_name);
3199 		s->first_displayed_entry = s->selected_entry = te;
3200 
3201 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3202 			break; /* jump to this file's entry */
3203 
3204 		slash = strchr(p, '/');
3205 		if (slash)
3206 			subpath = strndup(path, slash - path);
3207 		else
3208 			subpath = strdup(path);
3209 		if (subpath == NULL) {
3210 			err = got_error_from_errno("strdup");
3211 			break;
3212 		}
3213 
3214 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3215 		    subpath);
3216 		if (err)
3217 			break;
3218 
3219 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3220 		free(tree_id);
3221 		if (err)
3222 			break;
3223 
3224 		err = tree_view_visit_subtree(s, tree);
3225 		if (err) {
3226 			got_object_tree_close(tree);
3227 			break;
3228 		}
3229 		if (slash == NULL)
3230 			break;
3231 		free(subpath);
3232 		subpath = NULL;
3233 		p = slash;
3234 	}
3235 
3236 	free(subpath);
3237 	return err;
3238 }
3239 
3240 static const struct got_error *
3241 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3242     struct commit_queue_entry *entry, const char *path,
3243     const char *head_ref_name, struct got_repository *repo)
3244 {
3245 	const struct got_error *err = NULL;
3246 	struct tog_tree_view_state *s;
3247 	struct tog_view *tree_view;
3248 
3249 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3250 	if (tree_view == NULL)
3251 		return got_error_from_errno("view_open");
3252 
3253 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3254 	if (err)
3255 		return err;
3256 	s = &tree_view->state.tree;
3257 
3258 	*new_view = tree_view;
3259 
3260 	if (got_path_is_root_dir(path))
3261 		return NULL;
3262 
3263 	return tree_view_walk_path(s, entry->commit, path);
3264 }
3265 
3266 static const struct got_error *
3267 block_signals_used_by_main_thread(void)
3268 {
3269 	sigset_t sigset;
3270 	int errcode;
3271 
3272 	if (sigemptyset(&sigset) == -1)
3273 		return got_error_from_errno("sigemptyset");
3274 
3275 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3276 	if (sigaddset(&sigset, SIGWINCH) == -1)
3277 		return got_error_from_errno("sigaddset");
3278 	if (sigaddset(&sigset, SIGCONT) == -1)
3279 		return got_error_from_errno("sigaddset");
3280 	if (sigaddset(&sigset, SIGINT) == -1)
3281 		return got_error_from_errno("sigaddset");
3282 	if (sigaddset(&sigset, SIGTERM) == -1)
3283 		return got_error_from_errno("sigaddset");
3284 
3285 	/* ncurses handles SIGTSTP */
3286 	if (sigaddset(&sigset, SIGTSTP) == -1)
3287 		return got_error_from_errno("sigaddset");
3288 
3289 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3290 	if (errcode)
3291 		return got_error_set_errno(errcode, "pthread_sigmask");
3292 
3293 	return NULL;
3294 }
3295 
3296 static void *
3297 log_thread(void *arg)
3298 {
3299 	const struct got_error *err = NULL;
3300 	int errcode = 0;
3301 	struct tog_log_thread_args *a = arg;
3302 	int done = 0;
3303 
3304 	/*
3305 	 * Sync startup with main thread such that we begin our
3306 	 * work once view_input() has released the mutex.
3307 	 */
3308 	errcode = pthread_mutex_lock(&tog_mutex);
3309 	if (errcode) {
3310 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3311 		return (void *)err;
3312 	}
3313 
3314 	err = block_signals_used_by_main_thread();
3315 	if (err) {
3316 		pthread_mutex_unlock(&tog_mutex);
3317 		goto done;
3318 	}
3319 
3320 	while (!done && !err && !tog_fatal_signal_received()) {
3321 		errcode = pthread_mutex_unlock(&tog_mutex);
3322 		if (errcode) {
3323 			err = got_error_set_errno(errcode,
3324 			    "pthread_mutex_unlock");
3325 			goto done;
3326 		}
3327 		err = queue_commits(a);
3328 		if (err) {
3329 			if (err->code != GOT_ERR_ITER_COMPLETED)
3330 				goto done;
3331 			err = NULL;
3332 			done = 1;
3333 			a->commits_needed = 0;
3334 		} else if (a->commits_needed > 0 && !a->load_all) {
3335 			if (*a->limiting) {
3336 				if (a->limit_match)
3337 					a->commits_needed--;
3338 			} else
3339 				a->commits_needed--;
3340 		}
3341 
3342 		errcode = pthread_mutex_lock(&tog_mutex);
3343 		if (errcode) {
3344 			err = got_error_set_errno(errcode,
3345 			    "pthread_mutex_lock");
3346 			goto done;
3347 		} else if (*a->quit)
3348 			done = 1;
3349 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3350 			*a->first_displayed_entry =
3351 			    TAILQ_FIRST(&a->limit_commits->head);
3352 			*a->selected_entry = *a->first_displayed_entry;
3353 		} else if (*a->first_displayed_entry == NULL) {
3354 			*a->first_displayed_entry =
3355 			    TAILQ_FIRST(&a->real_commits->head);
3356 			*a->selected_entry = *a->first_displayed_entry;
3357 		}
3358 
3359 		errcode = pthread_cond_signal(&a->commit_loaded);
3360 		if (errcode) {
3361 			err = got_error_set_errno(errcode,
3362 			    "pthread_cond_signal");
3363 			pthread_mutex_unlock(&tog_mutex);
3364 			goto done;
3365 		}
3366 
3367 		if (a->commits_needed == 0 &&
3368 		    a->need_commit_marker && a->worktree) {
3369 			errcode = pthread_mutex_unlock(&tog_mutex);
3370 			if (errcode) {
3371 				err = got_error_set_errno(errcode,
3372 				    "pthread_mutex_unlock");
3373 				goto done;
3374 			}
3375 			err = got_worktree_get_state(&tog_base_commit.marker,
3376 			    a->repo, a->worktree, NULL, NULL);
3377 			if (err)
3378 				goto done;
3379 			errcode = pthread_mutex_lock(&tog_mutex);
3380 			if (errcode) {
3381 				err = got_error_set_errno(errcode,
3382 				    "pthread_mutex_lock");
3383 				goto done;
3384 			}
3385 			a->need_commit_marker = 0;
3386 			/*
3387 			 * The main thread did not close this
3388 			 * work tree yet. Close it now.
3389 			 */
3390 			got_worktree_close(a->worktree);
3391 			a->worktree = NULL;
3392 
3393 			if (*a->quit)
3394 				done = 1;
3395 		}
3396 
3397 		if (done)
3398 			a->commits_needed = 0;
3399 		else {
3400 			if (a->commits_needed == 0 && !a->load_all) {
3401 				if (tog_io.wait_for_ui) {
3402 					errcode = pthread_cond_signal(
3403 					    &a->log_loaded);
3404 					if (errcode && err == NULL)
3405 						err = got_error_set_errno(
3406 						    errcode,
3407 						    "pthread_cond_signal");
3408 				}
3409 
3410 				errcode = pthread_cond_wait(&a->need_commits,
3411 				    &tog_mutex);
3412 				if (errcode) {
3413 					err = got_error_set_errno(errcode,
3414 					    "pthread_cond_wait");
3415 					pthread_mutex_unlock(&tog_mutex);
3416 					goto done;
3417 				}
3418 				if (*a->quit)
3419 					done = 1;
3420 			}
3421 		}
3422 	}
3423 	a->log_complete = 1;
3424 	if (tog_io.wait_for_ui) {
3425 		errcode = pthread_cond_signal(&a->log_loaded);
3426 		if (errcode && err == NULL)
3427 			err = got_error_set_errno(errcode,
3428 			    "pthread_cond_signal");
3429 	}
3430 
3431 	errcode = pthread_mutex_unlock(&tog_mutex);
3432 	if (errcode)
3433 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3434 done:
3435 	if (err) {
3436 		tog_thread_error = 1;
3437 		pthread_cond_signal(&a->commit_loaded);
3438 		if (a->worktree) {
3439 			got_worktree_close(a->worktree);
3440 			a->worktree = NULL;
3441 		}
3442 	}
3443 	return (void *)err;
3444 }
3445 
3446 static const struct got_error *
3447 stop_log_thread(struct tog_log_view_state *s)
3448 {
3449 	const struct got_error *err = NULL, *thread_err = NULL;
3450 	int errcode;
3451 
3452 	if (s->thread) {
3453 		s->quit = 1;
3454 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3455 		if (errcode)
3456 			return got_error_set_errno(errcode,
3457 			    "pthread_cond_signal");
3458 		errcode = pthread_mutex_unlock(&tog_mutex);
3459 		if (errcode)
3460 			return got_error_set_errno(errcode,
3461 			    "pthread_mutex_unlock");
3462 		errcode = pthread_join(s->thread, (void **)&thread_err);
3463 		if (errcode)
3464 			return got_error_set_errno(errcode, "pthread_join");
3465 		errcode = pthread_mutex_lock(&tog_mutex);
3466 		if (errcode)
3467 			return got_error_set_errno(errcode,
3468 			    "pthread_mutex_lock");
3469 		s->thread = NULL;
3470 	}
3471 
3472 	if (s->thread_args.repo) {
3473 		err = got_repo_close(s->thread_args.repo);
3474 		s->thread_args.repo = NULL;
3475 	}
3476 
3477 	if (s->thread_args.pack_fds) {
3478 		const struct got_error *pack_err =
3479 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3480 		if (err == NULL)
3481 			err = pack_err;
3482 		s->thread_args.pack_fds = NULL;
3483 	}
3484 
3485 	if (s->thread_args.graph) {
3486 		got_commit_graph_close(s->thread_args.graph);
3487 		s->thread_args.graph = NULL;
3488 	}
3489 
3490 	return err ? err : thread_err;
3491 }
3492 
3493 static const struct got_error *
3494 close_log_view(struct tog_view *view)
3495 {
3496 	const struct got_error *err = NULL;
3497 	struct tog_log_view_state *s = &view->state.log;
3498 	int errcode;
3499 
3500 	err = stop_log_thread(s);
3501 
3502 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3503 	if (errcode && err == NULL)
3504 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3505 
3506 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3507 	if (errcode && err == NULL)
3508 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3509 
3510 	free_commits(&s->limit_commits);
3511 	free_commits(&s->real_commits);
3512 	free(s->in_repo_path);
3513 	s->in_repo_path = NULL;
3514 	free(s->start_id);
3515 	s->start_id = NULL;
3516 	free(s->head_ref_name);
3517 	s->head_ref_name = NULL;
3518 	return err;
3519 }
3520 
3521 /*
3522  * We use two queues to implement the limit feature: first consists of
3523  * commits matching the current limit_regex; second is the real queue
3524  * of all known commits (real_commits). When the user starts limiting,
3525  * we swap queues such that all movement and displaying functionality
3526  * works with very slight change.
3527  */
3528 static const struct got_error *
3529 limit_log_view(struct tog_view *view)
3530 {
3531 	struct tog_log_view_state *s = &view->state.log;
3532 	struct commit_queue_entry *entry;
3533 	struct tog_view	*v = view;
3534 	const struct got_error *err = NULL;
3535 	char pattern[1024];
3536 	int ret;
3537 
3538 	if (view_is_hsplit_top(view))
3539 		v = view->child;
3540 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3541 		v = view->parent;
3542 
3543 	/* Get the pattern */
3544 	wmove(v->window, v->nlines - 1, 0);
3545 	wclrtoeol(v->window);
3546 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3547 	nodelay(v->window, FALSE);
3548 	nocbreak();
3549 	echo();
3550 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3551 	cbreak();
3552 	noecho();
3553 	nodelay(v->window, TRUE);
3554 	if (ret == ERR)
3555 		return NULL;
3556 
3557 	if (*pattern == '\0') {
3558 		/*
3559 		 * Safety measure for the situation where the user
3560 		 * resets limit without previously limiting anything.
3561 		 */
3562 		if (!s->limit_view)
3563 			return NULL;
3564 
3565 		/*
3566 		 * User could have pressed Ctrl+L, which refreshed the
3567 		 * commit queues, it means we can't save previously
3568 		 * (before limit took place) displayed entries,
3569 		 * because they would point to already free'ed memory,
3570 		 * so we are forced to always select first entry of
3571 		 * the queue.
3572 		 */
3573 		s->commits = &s->real_commits;
3574 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3575 		s->selected_entry = s->first_displayed_entry;
3576 		s->selected = 0;
3577 		s->limit_view = 0;
3578 
3579 		return NULL;
3580 	}
3581 
3582 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3583 		return NULL;
3584 
3585 	s->limit_view = 1;
3586 
3587 	/* Clear the screen while loading limit view */
3588 	s->first_displayed_entry = NULL;
3589 	s->last_displayed_entry = NULL;
3590 	s->selected_entry = NULL;
3591 	s->commits = &s->limit_commits;
3592 
3593 	/* Prepare limit queue for new search */
3594 	free_commits(&s->limit_commits);
3595 	s->limit_commits.ncommits = 0;
3596 
3597 	/* First process commits, which are in queue already */
3598 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3599 		int have_match = 0;
3600 
3601 		err = match_commit(&have_match, entry->id,
3602 		    entry->commit, &s->limit_regex);
3603 		if (err)
3604 			return err;
3605 
3606 		if (have_match) {
3607 			struct commit_queue_entry *matched;
3608 
3609 			matched = alloc_commit_queue_entry(entry->commit,
3610 			    entry->id);
3611 			if (matched == NULL) {
3612 				err = got_error_from_errno(
3613 				    "alloc_commit_queue_entry");
3614 				break;
3615 			}
3616 			matched->commit = entry->commit;
3617 			got_object_commit_retain(entry->commit);
3618 
3619 			matched->idx = s->limit_commits.ncommits;
3620 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3621 			    matched, entry);
3622 			s->limit_commits.ncommits++;
3623 		}
3624 	}
3625 
3626 	/* Second process all the commits, until we fill the screen */
3627 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3628 	    !s->thread_args.log_complete) {
3629 		s->thread_args.commits_needed +=
3630 		    view->nlines - s->limit_commits.ncommits - 1;
3631 		err = trigger_log_thread(view, 1);
3632 		if (err)
3633 			return err;
3634 	}
3635 
3636 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3637 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3638 	s->selected = 0;
3639 
3640 	return NULL;
3641 }
3642 
3643 static const struct got_error *
3644 search_start_log_view(struct tog_view *view)
3645 {
3646 	struct tog_log_view_state *s = &view->state.log;
3647 
3648 	s->matched_entry = NULL;
3649 	s->search_entry = NULL;
3650 	return NULL;
3651 }
3652 
3653 static const struct got_error *
3654 search_next_log_view(struct tog_view *view)
3655 {
3656 	const struct got_error *err = NULL;
3657 	struct tog_log_view_state *s = &view->state.log;
3658 	struct commit_queue_entry *entry;
3659 
3660 	/* Display progress update in log view. */
3661 	show_log_view(view);
3662 	update_panels();
3663 	doupdate();
3664 
3665 	if (s->search_entry) {
3666 		int errcode, ch;
3667 		errcode = pthread_mutex_unlock(&tog_mutex);
3668 		if (errcode)
3669 			return got_error_set_errno(errcode,
3670 			    "pthread_mutex_unlock");
3671 		ch = wgetch(view->window);
3672 		errcode = pthread_mutex_lock(&tog_mutex);
3673 		if (errcode)
3674 			return got_error_set_errno(errcode,
3675 			    "pthread_mutex_lock");
3676 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3677 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3678 			return NULL;
3679 		}
3680 		if (view->searching == TOG_SEARCH_FORWARD)
3681 			entry = TAILQ_NEXT(s->search_entry, entry);
3682 		else
3683 			entry = TAILQ_PREV(s->search_entry,
3684 			    commit_queue_head, entry);
3685 	} else if (s->matched_entry) {
3686 		/*
3687 		 * If the user has moved the cursor after we hit a match,
3688 		 * the position from where we should continue searching
3689 		 * might have changed.
3690 		 */
3691 		if (view->searching == TOG_SEARCH_FORWARD)
3692 			entry = TAILQ_NEXT(s->selected_entry, entry);
3693 		else
3694 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3695 			    entry);
3696 	} else {
3697 		entry = s->selected_entry;
3698 	}
3699 
3700 	while (1) {
3701 		int have_match = 0;
3702 
3703 		if (entry == NULL) {
3704 			if (s->thread_args.log_complete ||
3705 			    view->searching == TOG_SEARCH_BACKWARD) {
3706 				view->search_next_done =
3707 				    (s->matched_entry == NULL ?
3708 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3709 				s->search_entry = NULL;
3710 				return NULL;
3711 			}
3712 			/*
3713 			 * Poke the log thread for more commits and return,
3714 			 * allowing the main loop to make progress. Search
3715 			 * will resume at s->search_entry once we come back.
3716 			 */
3717 			s->thread_args.commits_needed++;
3718 			return trigger_log_thread(view, 0);
3719 		}
3720 
3721 		err = match_commit(&have_match, entry->id, entry->commit,
3722 		    &view->regex);
3723 		if (err)
3724 			break;
3725 		if (have_match) {
3726 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3727 			s->matched_entry = entry;
3728 			break;
3729 		}
3730 
3731 		s->search_entry = entry;
3732 		if (view->searching == TOG_SEARCH_FORWARD)
3733 			entry = TAILQ_NEXT(entry, entry);
3734 		else
3735 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3736 	}
3737 
3738 	if (s->matched_entry) {
3739 		int cur = s->selected_entry->idx;
3740 		while (cur < s->matched_entry->idx) {
3741 			err = input_log_view(NULL, view, KEY_DOWN);
3742 			if (err)
3743 				return err;
3744 			cur++;
3745 		}
3746 		while (cur > s->matched_entry->idx) {
3747 			err = input_log_view(NULL, view, KEY_UP);
3748 			if (err)
3749 				return err;
3750 			cur--;
3751 		}
3752 	}
3753 
3754 	s->search_entry = NULL;
3755 
3756 	return NULL;
3757 }
3758 
3759 static const struct got_error *
3760 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3761     struct got_repository *repo, const char *head_ref_name,
3762     const char *in_repo_path, int log_branches,
3763     struct got_worktree *worktree)
3764 {
3765 	const struct got_error *err = NULL;
3766 	struct tog_log_view_state *s = &view->state.log;
3767 	struct got_repository *thread_repo = NULL;
3768 	struct got_commit_graph *thread_graph = NULL;
3769 	int errcode;
3770 
3771 	if (in_repo_path != s->in_repo_path) {
3772 		free(s->in_repo_path);
3773 		s->in_repo_path = strdup(in_repo_path);
3774 		if (s->in_repo_path == NULL) {
3775 			err = got_error_from_errno("strdup");
3776 			goto done;
3777 		}
3778 	}
3779 
3780 	/* The commit queue only contains commits being displayed. */
3781 	TAILQ_INIT(&s->real_commits.head);
3782 	s->real_commits.ncommits = 0;
3783 	s->commits = &s->real_commits;
3784 
3785 	TAILQ_INIT(&s->limit_commits.head);
3786 	s->limit_view = 0;
3787 	s->limit_commits.ncommits = 0;
3788 
3789 	s->repo = repo;
3790 	if (head_ref_name) {
3791 		s->head_ref_name = strdup(head_ref_name);
3792 		if (s->head_ref_name == NULL) {
3793 			err = got_error_from_errno("strdup");
3794 			goto done;
3795 		}
3796 	}
3797 	s->start_id = got_object_id_dup(start_id);
3798 	if (s->start_id == NULL) {
3799 		err = got_error_from_errno("got_object_id_dup");
3800 		goto done;
3801 	}
3802 	s->log_branches = log_branches;
3803 	s->use_committer = 1;
3804 
3805 	STAILQ_INIT(&s->colors);
3806 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3807 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3808 		    get_color_value("TOG_COLOR_COMMIT"));
3809 		if (err)
3810 			goto done;
3811 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3812 		    get_color_value("TOG_COLOR_AUTHOR"));
3813 		if (err) {
3814 			free_colors(&s->colors);
3815 			goto done;
3816 		}
3817 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3818 		    get_color_value("TOG_COLOR_DATE"));
3819 		if (err) {
3820 			free_colors(&s->colors);
3821 			goto done;
3822 		}
3823 	}
3824 
3825 	view->show = show_log_view;
3826 	view->input = input_log_view;
3827 	view->resize = resize_log_view;
3828 	view->close = close_log_view;
3829 	view->search_start = search_start_log_view;
3830 	view->search_next = search_next_log_view;
3831 
3832 	if (s->thread_args.pack_fds == NULL) {
3833 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3834 		if (err)
3835 			goto done;
3836 	}
3837 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3838 	    s->thread_args.pack_fds);
3839 	if (err)
3840 		goto done;
3841 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3842 	    !s->log_branches);
3843 	if (err)
3844 		goto done;
3845 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3846 	    s->repo, NULL, NULL);
3847 	if (err)
3848 		goto done;
3849 
3850 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3851 	if (errcode) {
3852 		err = got_error_set_errno(errcode, "pthread_cond_init");
3853 		goto done;
3854 	}
3855 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3856 	if (errcode) {
3857 		err = got_error_set_errno(errcode, "pthread_cond_init");
3858 		goto done;
3859 	}
3860 
3861 	if (using_mock_io) {
3862 		int rc;
3863 
3864 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3865 		if (rc)
3866 			return got_error_set_errno(rc, "pthread_cond_init");
3867 	}
3868 
3869 	s->thread_args.commits_needed = view->nlines;
3870 	s->thread_args.graph = thread_graph;
3871 	s->thread_args.real_commits = &s->real_commits;
3872 	s->thread_args.limit_commits = &s->limit_commits;
3873 	s->thread_args.in_repo_path = s->in_repo_path;
3874 	s->thread_args.start_id = s->start_id;
3875 	s->thread_args.repo = thread_repo;
3876 	s->thread_args.log_complete = 0;
3877 	s->thread_args.quit = &s->quit;
3878 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3879 	s->thread_args.selected_entry = &s->selected_entry;
3880 	s->thread_args.searching = &view->searching;
3881 	s->thread_args.search_next_done = &view->search_next_done;
3882 	s->thread_args.regex = &view->regex;
3883 	s->thread_args.limiting = &s->limit_view;
3884 	s->thread_args.limit_regex = &s->limit_regex;
3885 	s->thread_args.limit_commits = &s->limit_commits;
3886 	s->thread_args.worktree = worktree;
3887 	if (worktree)
3888 		s->thread_args.need_commit_marker = 1;
3889 done:
3890 	if (err) {
3891 		if (view->close == NULL)
3892 			close_log_view(view);
3893 		view_close(view);
3894 	}
3895 	return err;
3896 }
3897 
3898 static const struct got_error *
3899 show_log_view(struct tog_view *view)
3900 {
3901 	const struct got_error *err;
3902 	struct tog_log_view_state *s = &view->state.log;
3903 
3904 	if (s->thread == NULL) {
3905 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3906 		    &s->thread_args);
3907 		if (errcode)
3908 			return got_error_set_errno(errcode, "pthread_create");
3909 		if (s->thread_args.commits_needed > 0) {
3910 			err = trigger_log_thread(view, 1);
3911 			if (err)
3912 				return err;
3913 			if (tog_io.wait_for_ui) {
3914 				int rc;
3915 
3916 				rc = pthread_cond_wait(&s->thread_args.log_loaded,
3917 				    &tog_mutex);
3918 				if (rc)
3919 					return got_error_set_errno(rc,
3920 					    "pthread_cond_wait");
3921 				tog_io.wait_for_ui = 0;
3922 			}
3923 		}
3924 	}
3925 
3926 	return draw_commits(view);
3927 }
3928 
3929 static void
3930 log_move_cursor_up(struct tog_view *view, int page, int home)
3931 {
3932 	struct tog_log_view_state *s = &view->state.log;
3933 
3934 	if (s->first_displayed_entry == NULL)
3935 		return;
3936 	if (s->selected_entry->idx == 0)
3937 		view->count = 0;
3938 
3939 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3940 	    || home)
3941 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3942 
3943 	if (!page && !home && s->selected > 0)
3944 		--s->selected;
3945 	else
3946 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3947 
3948 	select_commit(s);
3949 	return;
3950 }
3951 
3952 static const struct got_error *
3953 log_move_cursor_down(struct tog_view *view, int page)
3954 {
3955 	struct tog_log_view_state	*s = &view->state.log;
3956 	const struct got_error		*err = NULL;
3957 	int				 eos = view->nlines - 2;
3958 
3959 	if (s->first_displayed_entry == NULL)
3960 		return NULL;
3961 
3962 	if (s->thread_args.log_complete &&
3963 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3964 		return NULL;
3965 
3966 	if (view_is_hsplit_top(view))
3967 		--eos;  /* border consumes the last line */
3968 
3969 	if (!page) {
3970 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3971 			++s->selected;
3972 		else
3973 			err = log_scroll_down(view, 1);
3974 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3975 		struct commit_queue_entry *entry;
3976 		int n;
3977 
3978 		s->selected = 0;
3979 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3980 		s->last_displayed_entry = entry;
3981 		for (n = 0; n <= eos; n++) {
3982 			if (entry == NULL)
3983 				break;
3984 			s->first_displayed_entry = entry;
3985 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3986 		}
3987 		if (n > 0)
3988 			s->selected = n - 1;
3989 	} else {
3990 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3991 		    s->thread_args.log_complete)
3992 			s->selected += MIN(page,
3993 			    s->commits->ncommits - s->selected_entry->idx - 1);
3994 		else
3995 			err = log_scroll_down(view, page);
3996 	}
3997 	if (err)
3998 		return err;
3999 
4000 	/*
4001 	 * We might necessarily overshoot in horizontal
4002 	 * splits; if so, select the last displayed commit.
4003 	 */
4004 	if (s->first_displayed_entry && s->last_displayed_entry) {
4005 		s->selected = MIN(s->selected,
4006 		    s->last_displayed_entry->idx -
4007 		    s->first_displayed_entry->idx);
4008 	}
4009 
4010 	select_commit(s);
4011 
4012 	if (s->thread_args.log_complete &&
4013 	    s->selected_entry->idx == s->commits->ncommits - 1)
4014 		view->count = 0;
4015 
4016 	return NULL;
4017 }
4018 
4019 static void
4020 view_get_split(struct tog_view *view, int *y, int *x)
4021 {
4022 	*x = 0;
4023 	*y = 0;
4024 
4025 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4026 		if (view->child && view->child->resized_y)
4027 			*y = view->child->resized_y;
4028 		else if (view->resized_y)
4029 			*y = view->resized_y;
4030 		else
4031 			*y = view_split_begin_y(view->lines);
4032 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4033 		if (view->child && view->child->resized_x)
4034 			*x = view->child->resized_x;
4035 		else if (view->resized_x)
4036 			*x = view->resized_x;
4037 		else
4038 			*x = view_split_begin_x(view->begin_x);
4039 	}
4040 }
4041 
4042 /* Split view horizontally at y and offset view->state->selected line. */
4043 static const struct got_error *
4044 view_init_hsplit(struct tog_view *view, int y)
4045 {
4046 	const struct got_error *err = NULL;
4047 
4048 	view->nlines = y;
4049 	view->ncols = COLS;
4050 	err = view_resize(view);
4051 	if (err)
4052 		return err;
4053 
4054 	err = offset_selection_down(view);
4055 
4056 	return err;
4057 }
4058 
4059 static const struct got_error *
4060 log_goto_line(struct tog_view *view, int nlines)
4061 {
4062 	const struct got_error		*err = NULL;
4063 	struct tog_log_view_state	*s = &view->state.log;
4064 	int				 g, idx = s->selected_entry->idx;
4065 
4066 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4067 		return NULL;
4068 
4069 	g = view->gline;
4070 	view->gline = 0;
4071 
4072 	if (g >= s->first_displayed_entry->idx + 1 &&
4073 	    g <= s->last_displayed_entry->idx + 1 &&
4074 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4075 		s->selected = g - s->first_displayed_entry->idx - 1;
4076 		select_commit(s);
4077 		return NULL;
4078 	}
4079 
4080 	if (idx + 1 < g) {
4081 		err = log_move_cursor_down(view, g - idx - 1);
4082 		if (!err && g > s->selected_entry->idx + 1)
4083 			err = log_move_cursor_down(view,
4084 			    g - s->first_displayed_entry->idx - 1);
4085 		if (err)
4086 			return err;
4087 	} else if (idx + 1 > g)
4088 		log_move_cursor_up(view, idx - g + 1, 0);
4089 
4090 	if (g < nlines && s->first_displayed_entry->idx == 0)
4091 		s->selected = g - 1;
4092 
4093 	select_commit(s);
4094 	return NULL;
4095 
4096 }
4097 
4098 static void
4099 horizontal_scroll_input(struct tog_view *view, int ch)
4100 {
4101 
4102 	switch (ch) {
4103 	case KEY_LEFT:
4104 	case 'h':
4105 		view->x -= MIN(view->x, 2);
4106 		if (view->x <= 0)
4107 			view->count = 0;
4108 		break;
4109 	case KEY_RIGHT:
4110 	case 'l':
4111 		if (view->x + view->ncols / 2 < view->maxx)
4112 			view->x += 2;
4113 		else
4114 			view->count = 0;
4115 		break;
4116 	case '0':
4117 		view->x = 0;
4118 		break;
4119 	case '$':
4120 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4121 		view->count = 0;
4122 		break;
4123 	default:
4124 		break;
4125 	}
4126 }
4127 
4128 static const struct got_error *
4129 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4130 {
4131 	const struct got_error *err = NULL;
4132 	struct tog_log_view_state *s = &view->state.log;
4133 	int eos, nscroll;
4134 
4135 	if (s->thread_args.load_all) {
4136 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4137 			s->thread_args.load_all = 0;
4138 		else if (s->thread_args.log_complete) {
4139 			err = log_move_cursor_down(view, s->commits->ncommits);
4140 			s->thread_args.load_all = 0;
4141 		}
4142 		if (err)
4143 			return err;
4144 	}
4145 
4146 	eos = nscroll = view->nlines - 1;
4147 	if (view_is_hsplit_top(view))
4148 		--eos;  /* border */
4149 
4150 	if (view->gline)
4151 		return log_goto_line(view, eos);
4152 
4153 	switch (ch) {
4154 	case '&':
4155 		err = limit_log_view(view);
4156 		break;
4157 	case 'q':
4158 		s->quit = 1;
4159 		break;
4160 	case '0':
4161 	case '$':
4162 	case KEY_RIGHT:
4163 	case 'l':
4164 	case KEY_LEFT:
4165 	case 'h':
4166 		horizontal_scroll_input(view, ch);
4167 		break;
4168 	case 'k':
4169 	case KEY_UP:
4170 	case '<':
4171 	case ',':
4172 	case CTRL('p'):
4173 		log_move_cursor_up(view, 0, 0);
4174 		break;
4175 	case 'g':
4176 	case '=':
4177 	case KEY_HOME:
4178 		log_move_cursor_up(view, 0, 1);
4179 		view->count = 0;
4180 		break;
4181 	case CTRL('u'):
4182 	case 'u':
4183 		nscroll /= 2;
4184 		/* FALL THROUGH */
4185 	case KEY_PPAGE:
4186 	case CTRL('b'):
4187 	case 'b':
4188 		log_move_cursor_up(view, nscroll, 0);
4189 		break;
4190 	case 'j':
4191 	case KEY_DOWN:
4192 	case '>':
4193 	case '.':
4194 	case CTRL('n'):
4195 		err = log_move_cursor_down(view, 0);
4196 		break;
4197 	case '@':
4198 		s->use_committer = !s->use_committer;
4199 		view->action = s->use_committer ?
4200 		    "show committer" : "show commit author";
4201 		break;
4202 	case 'G':
4203 	case '*':
4204 	case KEY_END: {
4205 		/* We don't know yet how many commits, so we're forced to
4206 		 * traverse them all. */
4207 		view->count = 0;
4208 		s->thread_args.load_all = 1;
4209 		if (!s->thread_args.log_complete)
4210 			return trigger_log_thread(view, 0);
4211 		err = log_move_cursor_down(view, s->commits->ncommits);
4212 		s->thread_args.load_all = 0;
4213 		break;
4214 	}
4215 	case CTRL('d'):
4216 	case 'd':
4217 		nscroll /= 2;
4218 		/* FALL THROUGH */
4219 	case KEY_NPAGE:
4220 	case CTRL('f'):
4221 	case 'f':
4222 	case ' ':
4223 		err = log_move_cursor_down(view, nscroll);
4224 		break;
4225 	case KEY_RESIZE:
4226 		if (s->selected > view->nlines - 2)
4227 			s->selected = view->nlines - 2;
4228 		if (s->selected > s->commits->ncommits - 1)
4229 			s->selected = s->commits->ncommits - 1;
4230 		select_commit(s);
4231 		if (s->commits->ncommits < view->nlines - 1 &&
4232 		    !s->thread_args.log_complete) {
4233 			s->thread_args.commits_needed += (view->nlines - 1) -
4234 			    s->commits->ncommits;
4235 			err = trigger_log_thread(view, 1);
4236 		}
4237 		break;
4238 	case KEY_ENTER:
4239 	case '\r':
4240 		view->count = 0;
4241 		if (s->selected_entry == NULL)
4242 			break;
4243 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4244 		break;
4245 	case 'T':
4246 		view->count = 0;
4247 		if (s->selected_entry == NULL)
4248 			break;
4249 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4250 		break;
4251 	case KEY_BACKSPACE:
4252 	case CTRL('l'):
4253 	case 'B':
4254 		view->count = 0;
4255 		if (ch == KEY_BACKSPACE &&
4256 		    got_path_is_root_dir(s->in_repo_path))
4257 			break;
4258 		err = stop_log_thread(s);
4259 		if (err)
4260 			return err;
4261 		if (ch == KEY_BACKSPACE) {
4262 			char *parent_path;
4263 			err = got_path_dirname(&parent_path, s->in_repo_path);
4264 			if (err)
4265 				return err;
4266 			free(s->in_repo_path);
4267 			s->in_repo_path = parent_path;
4268 			s->thread_args.in_repo_path = s->in_repo_path;
4269 		} else if (ch == CTRL('l')) {
4270 			struct got_object_id *start_id;
4271 			err = got_repo_match_object_id(&start_id, NULL,
4272 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4273 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4274 			if (err) {
4275 				if (s->head_ref_name == NULL ||
4276 				    err->code != GOT_ERR_NOT_REF)
4277 					return err;
4278 				/* Try to cope with deleted references. */
4279 				free(s->head_ref_name);
4280 				s->head_ref_name = NULL;
4281 				err = got_repo_match_object_id(&start_id,
4282 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4283 				    &tog_refs, s->repo);
4284 				if (err)
4285 					return err;
4286 			}
4287 			free(s->start_id);
4288 			s->start_id = start_id;
4289 			s->thread_args.start_id = s->start_id;
4290 		} else /* 'B' */
4291 			s->log_branches = !s->log_branches;
4292 
4293 		if (s->thread_args.pack_fds == NULL) {
4294 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4295 			if (err)
4296 				return err;
4297 		}
4298 		err = got_repo_open(&s->thread_args.repo,
4299 		    got_repo_get_path(s->repo), NULL,
4300 		    s->thread_args.pack_fds);
4301 		if (err)
4302 			return err;
4303 		tog_free_refs();
4304 		err = tog_load_refs(s->repo, 0);
4305 		if (err)
4306 			return err;
4307 		err = got_commit_graph_open(&s->thread_args.graph,
4308 		    s->in_repo_path, !s->log_branches);
4309 		if (err)
4310 			return err;
4311 		err = got_commit_graph_iter_start(s->thread_args.graph,
4312 		    s->start_id, s->repo, NULL, NULL);
4313 		if (err)
4314 			return err;
4315 		free_commits(&s->real_commits);
4316 		free_commits(&s->limit_commits);
4317 		s->first_displayed_entry = NULL;
4318 		s->last_displayed_entry = NULL;
4319 		s->selected_entry = NULL;
4320 		s->selected = 0;
4321 		s->thread_args.log_complete = 0;
4322 		s->quit = 0;
4323 		s->thread_args.commits_needed = view->lines;
4324 		s->matched_entry = NULL;
4325 		s->search_entry = NULL;
4326 		view->offset = 0;
4327 		break;
4328 	case 'R':
4329 		view->count = 0;
4330 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4331 		break;
4332 	default:
4333 		view->count = 0;
4334 		break;
4335 	}
4336 
4337 	return err;
4338 }
4339 
4340 static const struct got_error *
4341 apply_unveil(const char *repo_path, const char *worktree_path)
4342 {
4343 	const struct got_error *error;
4344 
4345 #ifdef PROFILE
4346 	if (unveil("gmon.out", "rwc") != 0)
4347 		return got_error_from_errno2("unveil", "gmon.out");
4348 #endif
4349 	if (repo_path && unveil(repo_path, "r") != 0)
4350 		return got_error_from_errno2("unveil", repo_path);
4351 
4352 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4353 		return got_error_from_errno2("unveil", worktree_path);
4354 
4355 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4356 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4357 
4358 	error = got_privsep_unveil_exec_helpers();
4359 	if (error != NULL)
4360 		return error;
4361 
4362 	if (unveil(NULL, NULL) != 0)
4363 		return got_error_from_errno("unveil");
4364 
4365 	return NULL;
4366 }
4367 
4368 static const struct got_error *
4369 init_mock_term(const char *test_script_path)
4370 {
4371 	const struct got_error	*err = NULL;
4372 	const char *screen_dump_path;
4373 	int in;
4374 
4375 	if (test_script_path == NULL || *test_script_path == '\0')
4376 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4377 
4378 	tog_io.f = fopen(test_script_path, "re");
4379 	if (tog_io.f == NULL) {
4380 		err = got_error_from_errno_fmt("fopen: %s",
4381 		    test_script_path);
4382 		goto done;
4383 	}
4384 
4385 	/* test mode, we don't want any output */
4386 	tog_io.cout = fopen("/dev/null", "w+");
4387 	if (tog_io.cout == NULL) {
4388 		err = got_error_from_errno2("fopen", "/dev/null");
4389 		goto done;
4390 	}
4391 
4392 	in = dup(fileno(tog_io.cout));
4393 	if (in == -1) {
4394 		err = got_error_from_errno("dup");
4395 		goto done;
4396 	}
4397 	tog_io.cin = fdopen(in, "r");
4398 	if (tog_io.cin == NULL) {
4399 		err = got_error_from_errno("fdopen");
4400 		close(in);
4401 		goto done;
4402 	}
4403 
4404 	screen_dump_path = getenv("TOG_SCR_DUMP");
4405 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4406 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4407 	tog_io.sdump = fopen(screen_dump_path, "we");
4408 	if (tog_io.sdump == NULL) {
4409 		err = got_error_from_errno2("fopen", screen_dump_path);
4410 		goto done;
4411 	}
4412 
4413 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4414 		err = got_error_from_errno("fseeko");
4415 		goto done;
4416 	}
4417 
4418 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4419 		err = got_error_msg(GOT_ERR_IO,
4420 		    "newterm: failed to initialise curses");
4421 
4422 	using_mock_io = 1;
4423 
4424 done:
4425 	if (err)
4426 		tog_io_close();
4427 	return err;
4428 }
4429 
4430 static void
4431 init_curses(void)
4432 {
4433 	/*
4434 	 * Override default signal handlers before starting ncurses.
4435 	 * This should prevent ncurses from installing its own
4436 	 * broken cleanup() signal handler.
4437 	 */
4438 	signal(SIGWINCH, tog_sigwinch);
4439 	signal(SIGPIPE, tog_sigpipe);
4440 	signal(SIGCONT, tog_sigcont);
4441 	signal(SIGINT, tog_sigint);
4442 	signal(SIGTERM, tog_sigterm);
4443 
4444 	if (using_mock_io) /* In test mode we use a fake terminal */
4445 		return;
4446 
4447 	initscr();
4448 
4449 	cbreak();
4450 	halfdelay(1); /* Fast refresh while initial view is loading. */
4451 	noecho();
4452 	nonl();
4453 	intrflush(stdscr, FALSE);
4454 	keypad(stdscr, TRUE);
4455 	curs_set(0);
4456 	if (getenv("TOG_COLORS") != NULL) {
4457 		start_color();
4458 		use_default_colors();
4459 	}
4460 
4461 	return;
4462 }
4463 
4464 static const struct got_error *
4465 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4466 {
4467 	tog_base_commit.id = got_object_id_dup(
4468 	    got_worktree_get_base_commit_id(worktree));
4469 	if (tog_base_commit.id == NULL)
4470 		return got_error_from_errno( "got_object_id_dup");
4471 
4472 	return NULL;
4473 }
4474 
4475 static const struct got_error *
4476 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4477     struct got_repository *repo, struct got_worktree *worktree)
4478 {
4479 	const struct got_error *err = NULL;
4480 
4481 	if (argc == 0) {
4482 		*in_repo_path = strdup("/");
4483 		if (*in_repo_path == NULL)
4484 			return got_error_from_errno("strdup");
4485 		return NULL;
4486 	}
4487 
4488 	if (worktree) {
4489 		const char *prefix = got_worktree_get_path_prefix(worktree);
4490 		char *p;
4491 
4492 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4493 		if (err)
4494 			return err;
4495 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4496 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4497 		    p) == -1) {
4498 			err = got_error_from_errno("asprintf");
4499 			*in_repo_path = NULL;
4500 		}
4501 		free(p);
4502 	} else
4503 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4504 
4505 	return err;
4506 }
4507 
4508 static const struct got_error *
4509 cmd_log(int argc, char *argv[])
4510 {
4511 	const struct got_error *error;
4512 	struct got_repository *repo = NULL;
4513 	struct got_worktree *worktree = NULL;
4514 	struct got_object_id *start_id = NULL;
4515 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4516 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4517 	struct got_reference *ref = NULL;
4518 	const char *head_ref_name = NULL;
4519 	int ch, log_branches = 0;
4520 	struct tog_view *view;
4521 	int *pack_fds = NULL;
4522 
4523 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4524 		switch (ch) {
4525 		case 'b':
4526 			log_branches = 1;
4527 			break;
4528 		case 'c':
4529 			start_commit = optarg;
4530 			break;
4531 		case 'r':
4532 			repo_path = realpath(optarg, NULL);
4533 			if (repo_path == NULL)
4534 				return got_error_from_errno2("realpath",
4535 				    optarg);
4536 			break;
4537 		default:
4538 			usage_log();
4539 			/* NOTREACHED */
4540 		}
4541 	}
4542 
4543 	argc -= optind;
4544 	argv += optind;
4545 
4546 	if (argc > 1)
4547 		usage_log();
4548 
4549 	error = got_repo_pack_fds_open(&pack_fds);
4550 	if (error != NULL)
4551 		goto done;
4552 
4553 	if (repo_path == NULL) {
4554 		cwd = getcwd(NULL, 0);
4555 		if (cwd == NULL) {
4556 			error = got_error_from_errno("getcwd");
4557 			goto done;
4558 		}
4559 		error = got_worktree_open(&worktree, cwd, NULL);
4560 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4561 			goto done;
4562 		if (worktree)
4563 			repo_path =
4564 			    strdup(got_worktree_get_repo_path(worktree));
4565 		else
4566 			repo_path = strdup(cwd);
4567 		if (repo_path == NULL) {
4568 			error = got_error_from_errno("strdup");
4569 			goto done;
4570 		}
4571 	}
4572 
4573 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4574 	if (error != NULL)
4575 		goto done;
4576 
4577 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4578 	    repo, worktree);
4579 	if (error)
4580 		goto done;
4581 
4582 	init_curses();
4583 
4584 	error = apply_unveil(got_repo_get_path(repo),
4585 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4586 	if (error)
4587 		goto done;
4588 
4589 	/* already loaded by tog_log_with_path()? */
4590 	if (TAILQ_EMPTY(&tog_refs)) {
4591 		error = tog_load_refs(repo, 0);
4592 		if (error)
4593 			goto done;
4594 	}
4595 
4596 	if (start_commit == NULL) {
4597 		error = got_repo_match_object_id(&start_id, &label,
4598 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4599 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4600 		if (error)
4601 			goto done;
4602 		head_ref_name = label;
4603 	} else {
4604 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4605 		    repo, worktree);
4606 		if (error != NULL)
4607 			goto done;
4608 		if (keyword_idstr != NULL)
4609 			start_commit = keyword_idstr;
4610 
4611 		error = got_ref_open(&ref, repo, start_commit, 0);
4612 		if (error == NULL)
4613 			head_ref_name = got_ref_get_name(ref);
4614 		else if (error->code != GOT_ERR_NOT_REF)
4615 			goto done;
4616 		error = got_repo_match_object_id(&start_id, NULL,
4617 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4618 		if (error)
4619 			goto done;
4620 	}
4621 
4622 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4623 	if (view == NULL) {
4624 		error = got_error_from_errno("view_open");
4625 		goto done;
4626 	}
4627 
4628 	if (worktree) {
4629 		error = set_tog_base_commit(repo, worktree);
4630 		if (error != NULL)
4631 			goto done;
4632 	}
4633 
4634 	error = open_log_view(view, start_id, repo, head_ref_name,
4635 	    in_repo_path, log_branches, worktree);
4636 	if (error)
4637 		goto done;
4638 
4639 	if (worktree) {
4640 		/* The work tree will be closed by the log thread. */
4641 		worktree = NULL;
4642 	}
4643 
4644 	error = view_loop(view);
4645 
4646 done:
4647 	free(tog_base_commit.id);
4648 	free(keyword_idstr);
4649 	free(in_repo_path);
4650 	free(repo_path);
4651 	free(cwd);
4652 	free(start_id);
4653 	free(label);
4654 	if (ref)
4655 		got_ref_close(ref);
4656 	if (repo) {
4657 		const struct got_error *close_err = got_repo_close(repo);
4658 		if (error == NULL)
4659 			error = close_err;
4660 	}
4661 	if (worktree)
4662 		got_worktree_close(worktree);
4663 	if (pack_fds) {
4664 		const struct got_error *pack_err =
4665 		    got_repo_pack_fds_close(pack_fds);
4666 		if (error == NULL)
4667 			error = pack_err;
4668 	}
4669 	tog_free_refs();
4670 	return error;
4671 }
4672 
4673 __dead static void
4674 usage_diff(void)
4675 {
4676 	endwin();
4677 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4678 	    "object1 object2\n", getprogname());
4679 	exit(1);
4680 }
4681 
4682 static int
4683 match_line(const char *line, regex_t *regex, size_t nmatch,
4684     regmatch_t *regmatch)
4685 {
4686 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4687 }
4688 
4689 static struct tog_color *
4690 match_color(struct tog_colors *colors, const char *line)
4691 {
4692 	struct tog_color *tc = NULL;
4693 
4694 	STAILQ_FOREACH(tc, colors, entry) {
4695 		if (match_line(line, &tc->regex, 0, NULL))
4696 			return tc;
4697 	}
4698 
4699 	return NULL;
4700 }
4701 
4702 static const struct got_error *
4703 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4704     WINDOW *window, int skipcol, regmatch_t *regmatch)
4705 {
4706 	const struct got_error *err = NULL;
4707 	char *exstr = NULL;
4708 	wchar_t *wline = NULL;
4709 	int rme, rms, n, width, scrollx;
4710 	int width0 = 0, width1 = 0, width2 = 0;
4711 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4712 
4713 	*wtotal = 0;
4714 
4715 	rms = regmatch->rm_so;
4716 	rme = regmatch->rm_eo;
4717 
4718 	err = expand_tab(&exstr, line);
4719 	if (err)
4720 		return err;
4721 
4722 	/* Split the line into 3 segments, according to match offsets. */
4723 	seg0 = strndup(exstr, rms);
4724 	if (seg0 == NULL) {
4725 		err = got_error_from_errno("strndup");
4726 		goto done;
4727 	}
4728 	seg1 = strndup(exstr + rms, rme - rms);
4729 	if (seg1 == NULL) {
4730 		err = got_error_from_errno("strndup");
4731 		goto done;
4732 	}
4733 	seg2 = strdup(exstr + rme);
4734 	if (seg2 == NULL) {
4735 		err = got_error_from_errno("strndup");
4736 		goto done;
4737 	}
4738 
4739 	/* draw up to matched token if we haven't scrolled past it */
4740 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4741 	    col_tab_align, 1);
4742 	if (err)
4743 		goto done;
4744 	n = MAX(width0 - skipcol, 0);
4745 	if (n) {
4746 		free(wline);
4747 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4748 		    wlimit, col_tab_align, 1);
4749 		if (err)
4750 			goto done;
4751 		waddwstr(window, &wline[scrollx]);
4752 		wlimit -= width;
4753 		*wtotal += width;
4754 	}
4755 
4756 	if (wlimit > 0) {
4757 		int i = 0, w = 0;
4758 		size_t wlen;
4759 
4760 		free(wline);
4761 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4762 		    col_tab_align, 1);
4763 		if (err)
4764 			goto done;
4765 		wlen = wcslen(wline);
4766 		while (i < wlen) {
4767 			width = wcwidth(wline[i]);
4768 			if (width == -1) {
4769 				/* should not happen, tabs are expanded */
4770 				err = got_error(GOT_ERR_RANGE);
4771 				goto done;
4772 			}
4773 			if (width0 + w + width > skipcol)
4774 				break;
4775 			w += width;
4776 			i++;
4777 		}
4778 		/* draw (visible part of) matched token (if scrolled into it) */
4779 		if (width1 - w > 0) {
4780 			wattron(window, A_STANDOUT);
4781 			waddwstr(window, &wline[i]);
4782 			wattroff(window, A_STANDOUT);
4783 			wlimit -= (width1 - w);
4784 			*wtotal += (width1 - w);
4785 		}
4786 	}
4787 
4788 	if (wlimit > 0) {  /* draw rest of line */
4789 		free(wline);
4790 		if (skipcol > width0 + width1) {
4791 			err = format_line(&wline, &width2, &scrollx, seg2,
4792 			    skipcol - (width0 + width1), wlimit,
4793 			    col_tab_align, 1);
4794 			if (err)
4795 				goto done;
4796 			waddwstr(window, &wline[scrollx]);
4797 		} else {
4798 			err = format_line(&wline, &width2, NULL, seg2, 0,
4799 			    wlimit, col_tab_align, 1);
4800 			if (err)
4801 				goto done;
4802 			waddwstr(window, wline);
4803 		}
4804 		*wtotal += width2;
4805 	}
4806 done:
4807 	free(wline);
4808 	free(exstr);
4809 	free(seg0);
4810 	free(seg1);
4811 	free(seg2);
4812 	return err;
4813 }
4814 
4815 static int
4816 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4817 {
4818 	FILE	*f = NULL;
4819 	int	*eof, *first, *selected;
4820 
4821 	if (view->type == TOG_VIEW_DIFF) {
4822 		struct tog_diff_view_state *s = &view->state.diff;
4823 
4824 		first = &s->first_displayed_line;
4825 		selected = first;
4826 		eof = &s->eof;
4827 		f = s->f;
4828 	} else if (view->type == TOG_VIEW_HELP) {
4829 		struct tog_help_view_state *s = &view->state.help;
4830 
4831 		first = &s->first_displayed_line;
4832 		selected = first;
4833 		eof = &s->eof;
4834 		f = s->f;
4835 	} else if (view->type == TOG_VIEW_BLAME) {
4836 		struct tog_blame_view_state *s = &view->state.blame;
4837 
4838 		first = &s->first_displayed_line;
4839 		selected = &s->selected_line;
4840 		eof = &s->eof;
4841 		f = s->blame.f;
4842 	} else
4843 		return 0;
4844 
4845 	/* Center gline in the middle of the page like vi(1). */
4846 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4847 		return 0;
4848 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4849 		rewind(f);
4850 		*eof = 0;
4851 		*first = 1;
4852 		*lineno = 0;
4853 		*nprinted = 0;
4854 		return 0;
4855 	}
4856 
4857 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4858 		view->gline : (view->nlines - 3) / 2 + 1;
4859 	view->gline = 0;
4860 
4861 	return 1;
4862 }
4863 
4864 static const struct got_error *
4865 draw_file(struct tog_view *view, const char *header)
4866 {
4867 	struct tog_diff_view_state *s = &view->state.diff;
4868 	regmatch_t *regmatch = &view->regmatch;
4869 	const struct got_error *err;
4870 	int nprinted = 0;
4871 	char *line;
4872 	size_t linesize = 0;
4873 	ssize_t linelen;
4874 	wchar_t *wline;
4875 	int width;
4876 	int max_lines = view->nlines;
4877 	int nlines = s->nlines;
4878 	off_t line_offset;
4879 
4880 	s->lineno = s->first_displayed_line - 1;
4881 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4882 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4883 		return got_error_from_errno("fseek");
4884 
4885 	werase(view->window);
4886 
4887 	if (view->gline > s->nlines - 1)
4888 		view->gline = s->nlines - 1;
4889 
4890 	if (header) {
4891 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4892 		    1 : view->gline - (view->nlines - 3) / 2 :
4893 		    s->lineno + s->selected_line;
4894 
4895 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4896 			return got_error_from_errno("asprintf");
4897 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4898 		    0, 0);
4899 		free(line);
4900 		if (err)
4901 			return err;
4902 
4903 		if (view_needs_focus_indication(view))
4904 			wstandout(view->window);
4905 		waddwstr(view->window, wline);
4906 		free(wline);
4907 		wline = NULL;
4908 		while (width++ < view->ncols)
4909 			waddch(view->window, ' ');
4910 		if (view_needs_focus_indication(view))
4911 			wstandend(view->window);
4912 
4913 		if (max_lines <= 1)
4914 			return NULL;
4915 		max_lines--;
4916 	}
4917 
4918 	s->eof = 0;
4919 	view->maxx = 0;
4920 	line = NULL;
4921 	while (max_lines > 0 && nprinted < max_lines) {
4922 		enum got_diff_line_type linetype;
4923 		attr_t attr = 0;
4924 
4925 		linelen = getline(&line, &linesize, s->f);
4926 		if (linelen == -1) {
4927 			if (feof(s->f)) {
4928 				s->eof = 1;
4929 				break;
4930 			}
4931 			free(line);
4932 			return got_ferror(s->f, GOT_ERR_IO);
4933 		}
4934 
4935 		if (++s->lineno < s->first_displayed_line)
4936 			continue;
4937 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4938 			continue;
4939 		if (s->lineno == view->hiline)
4940 			attr = A_STANDOUT;
4941 
4942 		/* Set view->maxx based on full line length. */
4943 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4944 		    view->x ? 1 : 0);
4945 		if (err) {
4946 			free(line);
4947 			return err;
4948 		}
4949 		view->maxx = MAX(view->maxx, width);
4950 		free(wline);
4951 		wline = NULL;
4952 
4953 		linetype = s->lines[s->lineno].type;
4954 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4955 		    linetype < GOT_DIFF_LINE_CONTEXT)
4956 			attr |= COLOR_PAIR(linetype);
4957 		if (attr)
4958 			wattron(view->window, attr);
4959 		if (s->first_displayed_line + nprinted == s->matched_line &&
4960 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4961 			err = add_matched_line(&width, line, view->ncols, 0,
4962 			    view->window, view->x, regmatch);
4963 			if (err) {
4964 				free(line);
4965 				return err;
4966 			}
4967 		} else {
4968 			int skip;
4969 			err = format_line(&wline, &width, &skip, line,
4970 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4971 			if (err) {
4972 				free(line);
4973 				return err;
4974 			}
4975 			waddwstr(view->window, &wline[skip]);
4976 			free(wline);
4977 			wline = NULL;
4978 		}
4979 		if (s->lineno == view->hiline) {
4980 			/* highlight full gline length */
4981 			while (width++ < view->ncols)
4982 				waddch(view->window, ' ');
4983 		} else {
4984 			if (width <= view->ncols - 1)
4985 				waddch(view->window, '\n');
4986 		}
4987 		if (attr)
4988 			wattroff(view->window, attr);
4989 		if (++nprinted == 1)
4990 			s->first_displayed_line = s->lineno;
4991 	}
4992 	free(line);
4993 	if (nprinted >= 1)
4994 		s->last_displayed_line = s->first_displayed_line +
4995 		    (nprinted - 1);
4996 	else
4997 		s->last_displayed_line = s->first_displayed_line;
4998 
4999 	view_border(view);
5000 
5001 	if (s->eof) {
5002 		while (nprinted < view->nlines) {
5003 			waddch(view->window, '\n');
5004 			nprinted++;
5005 		}
5006 
5007 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
5008 		    view->ncols, 0, 0);
5009 		if (err) {
5010 			return err;
5011 		}
5012 
5013 		wstandout(view->window);
5014 		waddwstr(view->window, wline);
5015 		free(wline);
5016 		wline = NULL;
5017 		wstandend(view->window);
5018 	}
5019 
5020 	return NULL;
5021 }
5022 
5023 static char *
5024 get_datestr(time_t *time, char *datebuf)
5025 {
5026 	struct tm mytm, *tm;
5027 	char *p, *s;
5028 
5029 	tm = gmtime_r(time, &mytm);
5030 	if (tm == NULL)
5031 		return NULL;
5032 	s = asctime_r(tm, datebuf);
5033 	if (s == NULL)
5034 		return NULL;
5035 	p = strchr(s, '\n');
5036 	if (p)
5037 		*p = '\0';
5038 	return s;
5039 }
5040 
5041 static const struct got_error *
5042 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5043     off_t off, uint8_t type)
5044 {
5045 	struct got_diff_line *p;
5046 
5047 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5048 	if (p == NULL)
5049 		return got_error_from_errno("reallocarray");
5050 	*lines = p;
5051 	(*lines)[*nlines].offset = off;
5052 	(*lines)[*nlines].type = type;
5053 	(*nlines)++;
5054 
5055 	return NULL;
5056 }
5057 
5058 static const struct got_error *
5059 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5060     struct got_diff_line *s_lines, size_t s_nlines)
5061 {
5062 	struct got_diff_line	*p;
5063 	char			 buf[BUFSIZ];
5064 	size_t			 i, r;
5065 
5066 	if (fseeko(src, 0L, SEEK_SET) == -1)
5067 		return got_error_from_errno("fseeko");
5068 
5069 	for (;;) {
5070 		r = fread(buf, 1, sizeof(buf), src);
5071 		if (r == 0) {
5072 			if (ferror(src))
5073 				return got_error_from_errno("fread");
5074 			if (feof(src))
5075 				break;
5076 		}
5077 		if (fwrite(buf, 1, r, dst) != r)
5078 			return got_ferror(dst, GOT_ERR_IO);
5079 	}
5080 
5081 	if (s_nlines == 0 && *d_nlines == 0)
5082 		return NULL;
5083 
5084 	/*
5085 	 * If commit info was in dst, increment line offsets
5086 	 * of the appended diff content, but skip s_lines[0]
5087 	 * because offset zero is already in *d_lines.
5088 	 */
5089 	if (*d_nlines > 0) {
5090 		for (i = 1; i < s_nlines; ++i)
5091 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5092 
5093 		if (s_nlines > 0) {
5094 			--s_nlines;
5095 			++s_lines;
5096 		}
5097 	}
5098 
5099 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5100 	if (p == NULL) {
5101 		/* d_lines is freed in close_diff_view() */
5102 		return got_error_from_errno("reallocarray");
5103 	}
5104 
5105 	*d_lines = p;
5106 
5107 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5108 	*d_nlines += s_nlines;
5109 
5110 	return NULL;
5111 }
5112 
5113 static const struct got_error *
5114 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5115     struct got_object_id *commit_id, struct got_reflist_head *refs,
5116     struct got_repository *repo, int ignore_ws, int force_text_diff,
5117     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5118 {
5119 	const struct got_error *err = NULL;
5120 	char datebuf[26], *datestr;
5121 	struct got_commit_object *commit;
5122 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5123 	time_t committer_time;
5124 	const char *author, *committer;
5125 	char *refs_str = NULL;
5126 	struct got_pathlist_entry *pe;
5127 	off_t outoff = 0;
5128 	int n;
5129 
5130 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5131 	if (err)
5132 		return err;
5133 
5134 	err = got_object_open_as_commit(&commit, repo, commit_id);
5135 	if (err)
5136 		return err;
5137 
5138 	err = got_object_id_str(&id_str, commit_id);
5139 	if (err) {
5140 		err = got_error_from_errno("got_object_id_str");
5141 		goto done;
5142 	}
5143 
5144 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5145 	if (err)
5146 		goto done;
5147 
5148 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5149 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5150 	if (n < 0) {
5151 		err = got_error_from_errno("fprintf");
5152 		goto done;
5153 	}
5154 	outoff += n;
5155 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5156 	if (err)
5157 		goto done;
5158 
5159 	n = fprintf(outfile, "from: %s\n",
5160 	    got_object_commit_get_author(commit));
5161 	if (n < 0) {
5162 		err = got_error_from_errno("fprintf");
5163 		goto done;
5164 	}
5165 	outoff += n;
5166 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5167 	if (err)
5168 		goto done;
5169 
5170 	author = got_object_commit_get_author(commit);
5171 	committer = got_object_commit_get_committer(commit);
5172 	if (strcmp(author, committer) != 0) {
5173 		n = fprintf(outfile, "via: %s\n", committer);
5174 		if (n < 0) {
5175 			err = got_error_from_errno("fprintf");
5176 			goto done;
5177 		}
5178 		outoff += n;
5179 		err = add_line_metadata(lines, nlines, outoff,
5180 		    GOT_DIFF_LINE_AUTHOR);
5181 		if (err)
5182 			goto done;
5183 	}
5184 	committer_time = got_object_commit_get_committer_time(commit);
5185 	datestr = get_datestr(&committer_time, datebuf);
5186 	if (datestr) {
5187 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5188 		if (n < 0) {
5189 			err = got_error_from_errno("fprintf");
5190 			goto done;
5191 		}
5192 		outoff += n;
5193 		err = add_line_metadata(lines, nlines, outoff,
5194 		    GOT_DIFF_LINE_DATE);
5195 		if (err)
5196 			goto done;
5197 	}
5198 	if (got_object_commit_get_nparents(commit) > 1) {
5199 		const struct got_object_id_queue *parent_ids;
5200 		struct got_object_qid *qid;
5201 		int pn = 1;
5202 		parent_ids = got_object_commit_get_parent_ids(commit);
5203 		STAILQ_FOREACH(qid, parent_ids, entry) {
5204 			err = got_object_id_str(&id_str, &qid->id);
5205 			if (err)
5206 				goto done;
5207 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5208 			if (n < 0) {
5209 				err = got_error_from_errno("fprintf");
5210 				goto done;
5211 			}
5212 			outoff += n;
5213 			err = add_line_metadata(lines, nlines, outoff,
5214 			    GOT_DIFF_LINE_META);
5215 			if (err)
5216 				goto done;
5217 			free(id_str);
5218 			id_str = NULL;
5219 		}
5220 	}
5221 
5222 	err = got_object_commit_get_logmsg(&logmsg, commit);
5223 	if (err)
5224 		goto done;
5225 	s = logmsg;
5226 	while ((line = strsep(&s, "\n")) != NULL) {
5227 		n = fprintf(outfile, "%s\n", line);
5228 		if (n < 0) {
5229 			err = got_error_from_errno("fprintf");
5230 			goto done;
5231 		}
5232 		outoff += n;
5233 		err = add_line_metadata(lines, nlines, outoff,
5234 		    GOT_DIFF_LINE_LOGMSG);
5235 		if (err)
5236 			goto done;
5237 	}
5238 
5239 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5240 		struct got_diff_changed_path *cp = pe->data;
5241 		int pad = dsa->max_path_len - pe->path_len + 1;
5242 
5243 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5244 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5245 		    dsa->rm_cols + 1, cp->rm);
5246 		if (n < 0) {
5247 			err = got_error_from_errno("fprintf");
5248 			goto done;
5249 		}
5250 		outoff += n;
5251 		err = add_line_metadata(lines, nlines, outoff,
5252 		    GOT_DIFF_LINE_CHANGES);
5253 		if (err)
5254 			goto done;
5255 	}
5256 
5257 	fputc('\n', outfile);
5258 	outoff++;
5259 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5260 	if (err)
5261 		goto done;
5262 
5263 	n = fprintf(outfile,
5264 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5265 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5266 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5267 	if (n < 0) {
5268 		err = got_error_from_errno("fprintf");
5269 		goto done;
5270 	}
5271 	outoff += n;
5272 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5273 	if (err)
5274 		goto done;
5275 
5276 	fputc('\n', outfile);
5277 	outoff++;
5278 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5279 done:
5280 	free(id_str);
5281 	free(logmsg);
5282 	free(refs_str);
5283 	got_object_commit_close(commit);
5284 	if (err) {
5285 		free(*lines);
5286 		*lines = NULL;
5287 		*nlines = 0;
5288 	}
5289 	return err;
5290 }
5291 
5292 static const struct got_error *
5293 create_diff(struct tog_diff_view_state *s)
5294 {
5295 	const struct got_error *err = NULL;
5296 	FILE *f = NULL, *tmp_diff_file = NULL;
5297 	int obj_type;
5298 	struct got_diff_line *lines = NULL;
5299 	struct got_pathlist_head changed_paths;
5300 
5301 	TAILQ_INIT(&changed_paths);
5302 
5303 	free(s->lines);
5304 	s->lines = malloc(sizeof(*s->lines));
5305 	if (s->lines == NULL)
5306 		return got_error_from_errno("malloc");
5307 	s->nlines = 0;
5308 
5309 	f = got_opentemp();
5310 	if (f == NULL) {
5311 		err = got_error_from_errno("got_opentemp");
5312 		goto done;
5313 	}
5314 	tmp_diff_file = got_opentemp();
5315 	if (tmp_diff_file == NULL) {
5316 		err = got_error_from_errno("got_opentemp");
5317 		goto done;
5318 	}
5319 	if (s->f && fclose(s->f) == EOF) {
5320 		err = got_error_from_errno("fclose");
5321 		goto done;
5322 	}
5323 	s->f = f;
5324 
5325 	if (s->id1)
5326 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5327 	else
5328 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5329 	if (err)
5330 		goto done;
5331 
5332 	switch (obj_type) {
5333 	case GOT_OBJ_TYPE_BLOB:
5334 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5335 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5336 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5337 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5338 		    s->f);
5339 		break;
5340 	case GOT_OBJ_TYPE_TREE:
5341 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5342 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5343 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5344 		    s->force_text_diff, NULL, s->repo, s->f);
5345 		break;
5346 	case GOT_OBJ_TYPE_COMMIT: {
5347 		const struct got_object_id_queue *parent_ids;
5348 		struct got_object_qid *pid;
5349 		struct got_commit_object *commit2;
5350 		struct got_reflist_head *refs;
5351 		size_t nlines = 0;
5352 		struct got_diffstat_cb_arg dsa = {
5353 			0, 0, 0, 0, 0, 0,
5354 			&changed_paths,
5355 			s->ignore_whitespace,
5356 			s->force_text_diff,
5357 			tog_diff_algo
5358 		};
5359 
5360 		lines = malloc(sizeof(*lines));
5361 		if (lines == NULL) {
5362 			err = got_error_from_errno("malloc");
5363 			goto done;
5364 		}
5365 
5366 		/* build diff first in tmp file then append to commit info */
5367 		err = got_diff_objects_as_commits(&lines, &nlines,
5368 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5369 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5370 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5371 		if (err)
5372 			break;
5373 
5374 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5375 		if (err)
5376 			goto done;
5377 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5378 		/* Show commit info if we're diffing to a parent/root commit. */
5379 		if (s->id1 == NULL) {
5380 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5381 			    refs, s->repo, s->ignore_whitespace,
5382 			    s->force_text_diff, &dsa, s->f);
5383 			if (err)
5384 				goto done;
5385 		} else {
5386 			parent_ids = got_object_commit_get_parent_ids(commit2);
5387 			STAILQ_FOREACH(pid, parent_ids, entry) {
5388 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5389 					err = write_commit_info(&s->lines,
5390 					    &s->nlines, s->id2, refs, s->repo,
5391 					    s->ignore_whitespace,
5392 					    s->force_text_diff, &dsa, s->f);
5393 					if (err)
5394 						goto done;
5395 					break;
5396 				}
5397 			}
5398 		}
5399 		got_object_commit_close(commit2);
5400 
5401 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5402 		    lines, nlines);
5403 		break;
5404 	}
5405 	default:
5406 		err = got_error(GOT_ERR_OBJ_TYPE);
5407 		break;
5408 	}
5409 done:
5410 	free(lines);
5411 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5412 	if (s->f && fflush(s->f) != 0 && err == NULL)
5413 		err = got_error_from_errno("fflush");
5414 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5415 		err = got_error_from_errno("fclose");
5416 	return err;
5417 }
5418 
5419 static void
5420 diff_view_indicate_progress(struct tog_view *view)
5421 {
5422 	mvwaddstr(view->window, 0, 0, "diffing...");
5423 	update_panels();
5424 	doupdate();
5425 }
5426 
5427 static const struct got_error *
5428 search_start_diff_view(struct tog_view *view)
5429 {
5430 	struct tog_diff_view_state *s = &view->state.diff;
5431 
5432 	s->matched_line = 0;
5433 	return NULL;
5434 }
5435 
5436 static void
5437 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5438     size_t *nlines, int **first, int **last, int **match, int **selected)
5439 {
5440 	struct tog_diff_view_state *s = &view->state.diff;
5441 
5442 	*f = s->f;
5443 	*nlines = s->nlines;
5444 	*line_offsets = NULL;
5445 	*match = &s->matched_line;
5446 	*first = &s->first_displayed_line;
5447 	*last = &s->last_displayed_line;
5448 	*selected = &s->selected_line;
5449 }
5450 
5451 static const struct got_error *
5452 search_next_view_match(struct tog_view *view)
5453 {
5454 	const struct got_error *err = NULL;
5455 	FILE *f;
5456 	int lineno;
5457 	char *line = NULL;
5458 	size_t linesize = 0;
5459 	ssize_t linelen;
5460 	off_t *line_offsets;
5461 	size_t nlines = 0;
5462 	int *first, *last, *match, *selected;
5463 
5464 	if (!view->search_setup)
5465 		return got_error_msg(GOT_ERR_NOT_IMPL,
5466 		    "view search not supported");
5467 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5468 	    &match, &selected);
5469 
5470 	if (!view->searching) {
5471 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5472 		return NULL;
5473 	}
5474 
5475 	if (*match) {
5476 		if (view->searching == TOG_SEARCH_FORWARD)
5477 			lineno = *first + 1;
5478 		else
5479 			lineno = *first - 1;
5480 	} else
5481 		lineno = *first - 1 + *selected;
5482 
5483 	while (1) {
5484 		off_t offset;
5485 
5486 		if (lineno <= 0 || lineno > nlines) {
5487 			if (*match == 0) {
5488 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5489 				break;
5490 			}
5491 
5492 			if (view->searching == TOG_SEARCH_FORWARD)
5493 				lineno = 1;
5494 			else
5495 				lineno = nlines;
5496 		}
5497 
5498 		offset = view->type == TOG_VIEW_DIFF ?
5499 		    view->state.diff.lines[lineno - 1].offset :
5500 		    line_offsets[lineno - 1];
5501 		if (fseeko(f, offset, SEEK_SET) != 0) {
5502 			free(line);
5503 			return got_error_from_errno("fseeko");
5504 		}
5505 		linelen = getline(&line, &linesize, f);
5506 		if (linelen != -1) {
5507 			char *exstr;
5508 			err = expand_tab(&exstr, line);
5509 			if (err)
5510 				break;
5511 			if (match_line(exstr, &view->regex, 1,
5512 			    &view->regmatch)) {
5513 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5514 				*match = lineno;
5515 				free(exstr);
5516 				break;
5517 			}
5518 			free(exstr);
5519 		}
5520 		if (view->searching == TOG_SEARCH_FORWARD)
5521 			lineno++;
5522 		else
5523 			lineno--;
5524 	}
5525 	free(line);
5526 
5527 	if (*match) {
5528 		*first = *match;
5529 		*selected = 1;
5530 	}
5531 
5532 	return err;
5533 }
5534 
5535 static const struct got_error *
5536 close_diff_view(struct tog_view *view)
5537 {
5538 	const struct got_error *err = NULL;
5539 	struct tog_diff_view_state *s = &view->state.diff;
5540 
5541 	free(s->id1);
5542 	s->id1 = NULL;
5543 	free(s->id2);
5544 	s->id2 = NULL;
5545 	if (s->f && fclose(s->f) == EOF)
5546 		err = got_error_from_errno("fclose");
5547 	s->f = NULL;
5548 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5549 		err = got_error_from_errno("fclose");
5550 	s->f1 = NULL;
5551 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5552 		err = got_error_from_errno("fclose");
5553 	s->f2 = NULL;
5554 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5555 		err = got_error_from_errno("close");
5556 	s->fd1 = -1;
5557 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5558 		err = got_error_from_errno("close");
5559 	s->fd2 = -1;
5560 	free(s->lines);
5561 	s->lines = NULL;
5562 	s->nlines = 0;
5563 	return err;
5564 }
5565 
5566 static const struct got_error *
5567 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5568     struct got_object_id *id2, const char *label1, const char *label2,
5569     int diff_context, int ignore_whitespace, int force_text_diff,
5570     struct tog_view *parent_view, struct got_repository *repo)
5571 {
5572 	const struct got_error *err;
5573 	struct tog_diff_view_state *s = &view->state.diff;
5574 
5575 	memset(s, 0, sizeof(*s));
5576 	s->fd1 = -1;
5577 	s->fd2 = -1;
5578 
5579 	if (id1 != NULL && id2 != NULL) {
5580 		int type1, type2;
5581 
5582 		err = got_object_get_type(&type1, repo, id1);
5583 		if (err)
5584 			goto done;
5585 		err = got_object_get_type(&type2, repo, id2);
5586 		if (err)
5587 			goto done;
5588 
5589 		if (type1 != type2) {
5590 			err = got_error(GOT_ERR_OBJ_TYPE);
5591 			goto done;
5592 		}
5593 	}
5594 	s->first_displayed_line = 1;
5595 	s->last_displayed_line = view->nlines;
5596 	s->selected_line = 1;
5597 	s->repo = repo;
5598 	s->id1 = id1;
5599 	s->id2 = id2;
5600 	s->label1 = label1;
5601 	s->label2 = label2;
5602 
5603 	if (id1) {
5604 		s->id1 = got_object_id_dup(id1);
5605 		if (s->id1 == NULL) {
5606 			err = got_error_from_errno("got_object_id_dup");
5607 			goto done;
5608 		}
5609 	} else
5610 		s->id1 = NULL;
5611 
5612 	s->id2 = got_object_id_dup(id2);
5613 	if (s->id2 == NULL) {
5614 		err = got_error_from_errno("got_object_id_dup");
5615 		goto done;
5616 	}
5617 
5618 	s->f1 = got_opentemp();
5619 	if (s->f1 == NULL) {
5620 		err = got_error_from_errno("got_opentemp");
5621 		goto done;
5622 	}
5623 
5624 	s->f2 = got_opentemp();
5625 	if (s->f2 == NULL) {
5626 		err = got_error_from_errno("got_opentemp");
5627 		goto done;
5628 	}
5629 
5630 	s->fd1 = got_opentempfd();
5631 	if (s->fd1 == -1) {
5632 		err = got_error_from_errno("got_opentempfd");
5633 		goto done;
5634 	}
5635 
5636 	s->fd2 = got_opentempfd();
5637 	if (s->fd2 == -1) {
5638 		err = got_error_from_errno("got_opentempfd");
5639 		goto done;
5640 	}
5641 
5642 	s->diff_context = diff_context;
5643 	s->ignore_whitespace = ignore_whitespace;
5644 	s->force_text_diff = force_text_diff;
5645 	s->parent_view = parent_view;
5646 	s->repo = repo;
5647 
5648 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5649 		int rc;
5650 
5651 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5652 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5653 		if (rc != ERR)
5654 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5655 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5656 		if (rc != ERR)
5657 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5658 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5659 		if (rc != ERR)
5660 			rc = init_pair(GOT_DIFF_LINE_META,
5661 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5662 		if (rc != ERR)
5663 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5664 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5665 		if (rc != ERR)
5666 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5667 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5668 		if (rc != ERR)
5669 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5670 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5671 		if (rc != ERR)
5672 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5673 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5674 		if (rc != ERR)
5675 			rc = init_pair(GOT_DIFF_LINE_DATE,
5676 			    get_color_value("TOG_COLOR_DATE"), -1);
5677 		if (rc == ERR) {
5678 			err = got_error(GOT_ERR_RANGE);
5679 			goto done;
5680 		}
5681 	}
5682 
5683 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5684 	    view_is_splitscreen(view))
5685 		show_log_view(parent_view); /* draw border */
5686 	diff_view_indicate_progress(view);
5687 
5688 	err = create_diff(s);
5689 
5690 	view->show = show_diff_view;
5691 	view->input = input_diff_view;
5692 	view->reset = reset_diff_view;
5693 	view->close = close_diff_view;
5694 	view->search_start = search_start_diff_view;
5695 	view->search_setup = search_setup_diff_view;
5696 	view->search_next = search_next_view_match;
5697 done:
5698 	if (err) {
5699 		if (view->close == NULL)
5700 			close_diff_view(view);
5701 		view_close(view);
5702 	}
5703 	return err;
5704 }
5705 
5706 static const struct got_error *
5707 show_diff_view(struct tog_view *view)
5708 {
5709 	const struct got_error *err;
5710 	struct tog_diff_view_state *s = &view->state.diff;
5711 	char *id_str1 = NULL, *id_str2, *header;
5712 	const char *label1, *label2;
5713 
5714 	if (s->id1) {
5715 		err = got_object_id_str(&id_str1, s->id1);
5716 		if (err)
5717 			return err;
5718 		label1 = s->label1 ? s->label1 : id_str1;
5719 	} else
5720 		label1 = "/dev/null";
5721 
5722 	err = got_object_id_str(&id_str2, s->id2);
5723 	if (err)
5724 		return err;
5725 	label2 = s->label2 ? s->label2 : id_str2;
5726 
5727 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5728 		err = got_error_from_errno("asprintf");
5729 		free(id_str1);
5730 		free(id_str2);
5731 		return err;
5732 	}
5733 	free(id_str1);
5734 	free(id_str2);
5735 
5736 	err = draw_file(view, header);
5737 	free(header);
5738 	return err;
5739 }
5740 
5741 static const struct got_error *
5742 set_selected_commit(struct tog_diff_view_state *s,
5743     struct commit_queue_entry *entry)
5744 {
5745 	const struct got_error *err;
5746 	const struct got_object_id_queue *parent_ids;
5747 	struct got_commit_object *selected_commit;
5748 	struct got_object_qid *pid;
5749 
5750 	free(s->id2);
5751 	s->id2 = got_object_id_dup(entry->id);
5752 	if (s->id2 == NULL)
5753 		return got_error_from_errno("got_object_id_dup");
5754 
5755 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5756 	if (err)
5757 		return err;
5758 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5759 	free(s->id1);
5760 	pid = STAILQ_FIRST(parent_ids);
5761 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5762 	got_object_commit_close(selected_commit);
5763 	return NULL;
5764 }
5765 
5766 static const struct got_error *
5767 reset_diff_view(struct tog_view *view)
5768 {
5769 	struct tog_diff_view_state *s = &view->state.diff;
5770 
5771 	view->count = 0;
5772 	wclear(view->window);
5773 	s->first_displayed_line = 1;
5774 	s->last_displayed_line = view->nlines;
5775 	s->matched_line = 0;
5776 	diff_view_indicate_progress(view);
5777 	return create_diff(s);
5778 }
5779 
5780 static void
5781 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5782 {
5783 	int start, i;
5784 
5785 	i = start = s->first_displayed_line - 1;
5786 
5787 	while (s->lines[i].type != type) {
5788 		if (i == 0)
5789 			i = s->nlines - 1;
5790 		if (--i == start)
5791 			return; /* do nothing, requested type not in file */
5792 	}
5793 
5794 	s->selected_line = 1;
5795 	s->first_displayed_line = i;
5796 }
5797 
5798 static void
5799 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5800 {
5801 	int start, i;
5802 
5803 	i = start = s->first_displayed_line + 1;
5804 
5805 	while (s->lines[i].type != type) {
5806 		if (i == s->nlines - 1)
5807 			i = 0;
5808 		if (++i == start)
5809 			return; /* do nothing, requested type not in file */
5810 	}
5811 
5812 	s->selected_line = 1;
5813 	s->first_displayed_line = i;
5814 }
5815 
5816 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5817     int, int, int);
5818 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5819     int, int);
5820 
5821 static const struct got_error *
5822 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5823 {
5824 	const struct got_error *err = NULL;
5825 	struct tog_diff_view_state *s = &view->state.diff;
5826 	struct tog_log_view_state *ls;
5827 	struct commit_queue_entry *old_selected_entry;
5828 	char *line = NULL;
5829 	size_t linesize = 0;
5830 	ssize_t linelen;
5831 	int i, nscroll = view->nlines - 1, up = 0;
5832 
5833 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5834 
5835 	switch (ch) {
5836 	case '0':
5837 	case '$':
5838 	case KEY_RIGHT:
5839 	case 'l':
5840 	case KEY_LEFT:
5841 	case 'h':
5842 		horizontal_scroll_input(view, ch);
5843 		break;
5844 	case 'a':
5845 	case 'w':
5846 		if (ch == 'a') {
5847 			s->force_text_diff = !s->force_text_diff;
5848 			view->action = s->force_text_diff ?
5849 			    "force ASCII text enabled" :
5850 			    "force ASCII text disabled";
5851 		}
5852 		else if (ch == 'w') {
5853 			s->ignore_whitespace = !s->ignore_whitespace;
5854 			view->action = s->ignore_whitespace ?
5855 			    "ignore whitespace enabled" :
5856 			    "ignore whitespace disabled";
5857 		}
5858 		err = reset_diff_view(view);
5859 		break;
5860 	case 'g':
5861 	case KEY_HOME:
5862 		s->first_displayed_line = 1;
5863 		view->count = 0;
5864 		break;
5865 	case 'G':
5866 	case KEY_END:
5867 		view->count = 0;
5868 		if (s->eof)
5869 			break;
5870 
5871 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5872 		s->eof = 1;
5873 		break;
5874 	case 'k':
5875 	case KEY_UP:
5876 	case CTRL('p'):
5877 		if (s->first_displayed_line > 1)
5878 			s->first_displayed_line--;
5879 		else
5880 			view->count = 0;
5881 		break;
5882 	case CTRL('u'):
5883 	case 'u':
5884 		nscroll /= 2;
5885 		/* FALL THROUGH */
5886 	case KEY_PPAGE:
5887 	case CTRL('b'):
5888 	case 'b':
5889 		if (s->first_displayed_line == 1) {
5890 			view->count = 0;
5891 			break;
5892 		}
5893 		i = 0;
5894 		while (i++ < nscroll && s->first_displayed_line > 1)
5895 			s->first_displayed_line--;
5896 		break;
5897 	case 'j':
5898 	case KEY_DOWN:
5899 	case CTRL('n'):
5900 		if (!s->eof)
5901 			s->first_displayed_line++;
5902 		else
5903 			view->count = 0;
5904 		break;
5905 	case CTRL('d'):
5906 	case 'd':
5907 		nscroll /= 2;
5908 		/* FALL THROUGH */
5909 	case KEY_NPAGE:
5910 	case CTRL('f'):
5911 	case 'f':
5912 	case ' ':
5913 		if (s->eof) {
5914 			view->count = 0;
5915 			break;
5916 		}
5917 		i = 0;
5918 		while (!s->eof && i++ < nscroll) {
5919 			linelen = getline(&line, &linesize, s->f);
5920 			s->first_displayed_line++;
5921 			if (linelen == -1) {
5922 				if (feof(s->f)) {
5923 					s->eof = 1;
5924 				} else
5925 					err = got_ferror(s->f, GOT_ERR_IO);
5926 				break;
5927 			}
5928 		}
5929 		free(line);
5930 		break;
5931 	case '(':
5932 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5933 		break;
5934 	case ')':
5935 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5936 		break;
5937 	case '{':
5938 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5939 		break;
5940 	case '}':
5941 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5942 		break;
5943 	case '[':
5944 		if (s->diff_context > 0) {
5945 			s->diff_context--;
5946 			s->matched_line = 0;
5947 			diff_view_indicate_progress(view);
5948 			err = create_diff(s);
5949 			if (s->first_displayed_line + view->nlines - 1 >
5950 			    s->nlines) {
5951 				s->first_displayed_line = 1;
5952 				s->last_displayed_line = view->nlines;
5953 			}
5954 		} else
5955 			view->count = 0;
5956 		break;
5957 	case ']':
5958 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5959 			s->diff_context++;
5960 			s->matched_line = 0;
5961 			diff_view_indicate_progress(view);
5962 			err = create_diff(s);
5963 		} else
5964 			view->count = 0;
5965 		break;
5966 	case '<':
5967 	case ',':
5968 	case 'K':
5969 		up = 1;
5970 		/* FALL THROUGH */
5971 	case '>':
5972 	case '.':
5973 	case 'J':
5974 		if (s->parent_view == NULL) {
5975 			view->count = 0;
5976 			break;
5977 		}
5978 		s->parent_view->count = view->count;
5979 
5980 		if (s->parent_view->type == TOG_VIEW_LOG) {
5981 			ls = &s->parent_view->state.log;
5982 			old_selected_entry = ls->selected_entry;
5983 
5984 			err = input_log_view(NULL, s->parent_view,
5985 			    up ? KEY_UP : KEY_DOWN);
5986 			if (err)
5987 				break;
5988 			view->count = s->parent_view->count;
5989 
5990 			if (old_selected_entry == ls->selected_entry)
5991 				break;
5992 
5993 			err = set_selected_commit(s, ls->selected_entry);
5994 			if (err)
5995 				break;
5996 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5997 			struct tog_blame_view_state *bs;
5998 			struct got_object_id *id, *prev_id;
5999 
6000 			bs = &s->parent_view->state.blame;
6001 			prev_id = get_annotation_for_line(bs->blame.lines,
6002 			    bs->blame.nlines, bs->last_diffed_line);
6003 
6004 			err = input_blame_view(&view, s->parent_view,
6005 			    up ? KEY_UP : KEY_DOWN);
6006 			if (err)
6007 				break;
6008 			view->count = s->parent_view->count;
6009 
6010 			if (prev_id == NULL)
6011 				break;
6012 			id = get_selected_commit_id(bs->blame.lines,
6013 			    bs->blame.nlines, bs->first_displayed_line,
6014 			    bs->selected_line);
6015 			if (id == NULL)
6016 				break;
6017 
6018 			if (!got_object_id_cmp(prev_id, id))
6019 				break;
6020 
6021 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6022 			if (err)
6023 				break;
6024 		}
6025 		s->first_displayed_line = 1;
6026 		s->last_displayed_line = view->nlines;
6027 		s->matched_line = 0;
6028 		view->x = 0;
6029 
6030 		diff_view_indicate_progress(view);
6031 		err = create_diff(s);
6032 		break;
6033 	default:
6034 		view->count = 0;
6035 		break;
6036 	}
6037 
6038 	return err;
6039 }
6040 
6041 static const struct got_error *
6042 cmd_diff(int argc, char *argv[])
6043 {
6044 	const struct got_error *error;
6045 	struct got_repository *repo = NULL;
6046 	struct got_worktree *worktree = NULL;
6047 	struct got_object_id *id1 = NULL, *id2 = NULL;
6048 	char *repo_path = NULL, *cwd = NULL;
6049 	char *id_str1 = NULL, *id_str2 = NULL;
6050 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6051 	char *label1 = NULL, *label2 = NULL;
6052 	int diff_context = 3, ignore_whitespace = 0;
6053 	int ch, force_text_diff = 0;
6054 	const char *errstr;
6055 	struct tog_view *view;
6056 	int *pack_fds = NULL;
6057 
6058 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6059 		switch (ch) {
6060 		case 'a':
6061 			force_text_diff = 1;
6062 			break;
6063 		case 'C':
6064 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6065 			    &errstr);
6066 			if (errstr != NULL)
6067 				errx(1, "number of context lines is %s: %s",
6068 				    errstr, errstr);
6069 			break;
6070 		case 'r':
6071 			repo_path = realpath(optarg, NULL);
6072 			if (repo_path == NULL)
6073 				return got_error_from_errno2("realpath",
6074 				    optarg);
6075 			got_path_strip_trailing_slashes(repo_path);
6076 			break;
6077 		case 'w':
6078 			ignore_whitespace = 1;
6079 			break;
6080 		default:
6081 			usage_diff();
6082 			/* NOTREACHED */
6083 		}
6084 	}
6085 
6086 	argc -= optind;
6087 	argv += optind;
6088 
6089 	if (argc == 0) {
6090 		usage_diff(); /* TODO show local worktree changes */
6091 	} else if (argc == 2) {
6092 		id_str1 = argv[0];
6093 		id_str2 = argv[1];
6094 	} else
6095 		usage_diff();
6096 
6097 	error = got_repo_pack_fds_open(&pack_fds);
6098 	if (error)
6099 		goto done;
6100 
6101 	if (repo_path == NULL) {
6102 		cwd = getcwd(NULL, 0);
6103 		if (cwd == NULL)
6104 			return got_error_from_errno("getcwd");
6105 		error = got_worktree_open(&worktree, cwd, NULL);
6106 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6107 			goto done;
6108 		if (worktree)
6109 			repo_path =
6110 			    strdup(got_worktree_get_repo_path(worktree));
6111 		else
6112 			repo_path = strdup(cwd);
6113 		if (repo_path == NULL) {
6114 			error = got_error_from_errno("strdup");
6115 			goto done;
6116 		}
6117 	}
6118 
6119 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6120 	if (error)
6121 		goto done;
6122 
6123 	init_curses();
6124 
6125 	error = apply_unveil(got_repo_get_path(repo), NULL);
6126 	if (error)
6127 		goto done;
6128 
6129 	error = tog_load_refs(repo, 0);
6130 	if (error)
6131 		goto done;
6132 
6133 	if (id_str1 != NULL) {
6134 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6135 		    repo, worktree);
6136 		if (error != NULL)
6137 			goto done;
6138 		if (keyword_idstr1 != NULL)
6139 			id_str1 = keyword_idstr1;
6140 	}
6141 	if (id_str2 != NULL) {
6142 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6143 		    repo, worktree);
6144 		if (error != NULL)
6145 			goto done;
6146 		if (keyword_idstr2 != NULL)
6147 			id_str2 = keyword_idstr2;
6148 	}
6149 
6150 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6151 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6152 	if (error)
6153 		goto done;
6154 
6155 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6156 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6157 	if (error)
6158 		goto done;
6159 
6160 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6161 	if (view == NULL) {
6162 		error = got_error_from_errno("view_open");
6163 		goto done;
6164 	}
6165 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6166 	    ignore_whitespace, force_text_diff, NULL,  repo);
6167 	if (error)
6168 		goto done;
6169 
6170 	if (worktree) {
6171 		error = set_tog_base_commit(repo, worktree);
6172 		if (error != NULL)
6173 			goto done;
6174 	}
6175 
6176 	error = view_loop(view);
6177 
6178 done:
6179 	free(tog_base_commit.id);
6180 	free(keyword_idstr1);
6181 	free(keyword_idstr2);
6182 	free(label1);
6183 	free(label2);
6184 	free(repo_path);
6185 	free(cwd);
6186 	if (repo) {
6187 		const struct got_error *close_err = got_repo_close(repo);
6188 		if (error == NULL)
6189 			error = close_err;
6190 	}
6191 	if (worktree)
6192 		got_worktree_close(worktree);
6193 	if (pack_fds) {
6194 		const struct got_error *pack_err =
6195 		    got_repo_pack_fds_close(pack_fds);
6196 		if (error == NULL)
6197 			error = pack_err;
6198 	}
6199 	tog_free_refs();
6200 	return error;
6201 }
6202 
6203 __dead static void
6204 usage_blame(void)
6205 {
6206 	endwin();
6207 	fprintf(stderr,
6208 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6209 	    getprogname());
6210 	exit(1);
6211 }
6212 
6213 struct tog_blame_line {
6214 	int annotated;
6215 	struct got_object_id *id;
6216 };
6217 
6218 static const struct got_error *
6219 draw_blame(struct tog_view *view)
6220 {
6221 	struct tog_blame_view_state *s = &view->state.blame;
6222 	struct tog_blame *blame = &s->blame;
6223 	regmatch_t *regmatch = &view->regmatch;
6224 	const struct got_error *err;
6225 	int lineno = 0, nprinted = 0;
6226 	char *line = NULL;
6227 	size_t linesize = 0;
6228 	ssize_t linelen;
6229 	wchar_t *wline;
6230 	int width;
6231 	struct tog_blame_line *blame_line;
6232 	struct got_object_id *prev_id = NULL;
6233 	char *id_str;
6234 	struct tog_color *tc;
6235 
6236 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6237 	if (err)
6238 		return err;
6239 
6240 	rewind(blame->f);
6241 	werase(view->window);
6242 
6243 	if (asprintf(&line, "commit %s", id_str) == -1) {
6244 		err = got_error_from_errno("asprintf");
6245 		free(id_str);
6246 		return err;
6247 	}
6248 
6249 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6250 	free(line);
6251 	line = NULL;
6252 	if (err)
6253 		return err;
6254 	if (view_needs_focus_indication(view))
6255 		wstandout(view->window);
6256 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6257 	if (tc)
6258 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6259 	waddwstr(view->window, wline);
6260 	while (width++ < view->ncols)
6261 		waddch(view->window, ' ');
6262 	if (tc)
6263 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6264 	if (view_needs_focus_indication(view))
6265 		wstandend(view->window);
6266 	free(wline);
6267 	wline = NULL;
6268 
6269 	if (view->gline > blame->nlines)
6270 		view->gline = blame->nlines;
6271 
6272 	if (tog_io.wait_for_ui) {
6273 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6274 		int rc;
6275 
6276 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6277 		if (rc)
6278 			return got_error_set_errno(rc, "pthread_cond_wait");
6279 		tog_io.wait_for_ui = 0;
6280 	}
6281 
6282 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6283 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6284 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6285 		free(id_str);
6286 		return got_error_from_errno("asprintf");
6287 	}
6288 	free(id_str);
6289 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6290 	free(line);
6291 	line = NULL;
6292 	if (err)
6293 		return err;
6294 	waddwstr(view->window, wline);
6295 	free(wline);
6296 	wline = NULL;
6297 	if (width < view->ncols - 1)
6298 		waddch(view->window, '\n');
6299 
6300 	s->eof = 0;
6301 	view->maxx = 0;
6302 	while (nprinted < view->nlines - 2) {
6303 		linelen = getline(&line, &linesize, blame->f);
6304 		if (linelen == -1) {
6305 			if (feof(blame->f)) {
6306 				s->eof = 1;
6307 				break;
6308 			}
6309 			free(line);
6310 			return got_ferror(blame->f, GOT_ERR_IO);
6311 		}
6312 		if (++lineno < s->first_displayed_line)
6313 			continue;
6314 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6315 			continue;
6316 
6317 		/* Set view->maxx based on full line length. */
6318 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6319 		if (err) {
6320 			free(line);
6321 			return err;
6322 		}
6323 		free(wline);
6324 		wline = NULL;
6325 		view->maxx = MAX(view->maxx, width);
6326 
6327 		if (nprinted == s->selected_line - 1)
6328 			wstandout(view->window);
6329 
6330 		if (blame->nlines > 0) {
6331 			blame_line = &blame->lines[lineno - 1];
6332 			if (blame_line->annotated && prev_id &&
6333 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6334 			    !(nprinted == s->selected_line - 1)) {
6335 				waddstr(view->window, "        ");
6336 			} else if (blame_line->annotated) {
6337 				char *id_str;
6338 				err = got_object_id_str(&id_str,
6339 				    blame_line->id);
6340 				if (err) {
6341 					free(line);
6342 					return err;
6343 				}
6344 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6345 				if (tc)
6346 					wattr_on(view->window,
6347 					    COLOR_PAIR(tc->colorpair), NULL);
6348 				wprintw(view->window, "%.8s", id_str);
6349 				if (tc)
6350 					wattr_off(view->window,
6351 					    COLOR_PAIR(tc->colorpair), NULL);
6352 				free(id_str);
6353 				prev_id = blame_line->id;
6354 			} else {
6355 				waddstr(view->window, "........");
6356 				prev_id = NULL;
6357 			}
6358 		} else {
6359 			waddstr(view->window, "........");
6360 			prev_id = NULL;
6361 		}
6362 
6363 		if (nprinted == s->selected_line - 1)
6364 			wstandend(view->window);
6365 		waddstr(view->window, " ");
6366 
6367 		if (view->ncols <= 9) {
6368 			width = 9;
6369 		} else if (s->first_displayed_line + nprinted ==
6370 		    s->matched_line &&
6371 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6372 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6373 			    view->window, view->x, regmatch);
6374 			if (err) {
6375 				free(line);
6376 				return err;
6377 			}
6378 			width += 9;
6379 		} else {
6380 			int skip;
6381 			err = format_line(&wline, &width, &skip, line,
6382 			    view->x, view->ncols - 9, 9, 1);
6383 			if (err) {
6384 				free(line);
6385 				return err;
6386 			}
6387 			waddwstr(view->window, &wline[skip]);
6388 			width += 9;
6389 			free(wline);
6390 			wline = NULL;
6391 		}
6392 
6393 		if (width <= view->ncols - 1)
6394 			waddch(view->window, '\n');
6395 		if (++nprinted == 1)
6396 			s->first_displayed_line = lineno;
6397 	}
6398 	free(line);
6399 	s->last_displayed_line = lineno;
6400 
6401 	view_border(view);
6402 
6403 	return NULL;
6404 }
6405 
6406 static const struct got_error *
6407 blame_cb(void *arg, int nlines, int lineno,
6408     struct got_commit_object *commit, struct got_object_id *id)
6409 {
6410 	const struct got_error *err = NULL;
6411 	struct tog_blame_cb_args *a = arg;
6412 	struct tog_blame_line *line;
6413 	int errcode;
6414 
6415 	if (nlines != a->nlines ||
6416 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6417 		return got_error(GOT_ERR_RANGE);
6418 
6419 	errcode = pthread_mutex_lock(&tog_mutex);
6420 	if (errcode)
6421 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6422 
6423 	if (*a->quit) {	/* user has quit the blame view */
6424 		err = got_error(GOT_ERR_ITER_COMPLETED);
6425 		goto done;
6426 	}
6427 
6428 	if (lineno == -1)
6429 		goto done; /* no change in this commit */
6430 
6431 	line = &a->lines[lineno - 1];
6432 	if (line->annotated)
6433 		goto done;
6434 
6435 	line->id = got_object_id_dup(id);
6436 	if (line->id == NULL) {
6437 		err = got_error_from_errno("got_object_id_dup");
6438 		goto done;
6439 	}
6440 	line->annotated = 1;
6441 done:
6442 	errcode = pthread_mutex_unlock(&tog_mutex);
6443 	if (errcode)
6444 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6445 	return err;
6446 }
6447 
6448 static void *
6449 blame_thread(void *arg)
6450 {
6451 	const struct got_error *err, *close_err;
6452 	struct tog_blame_thread_args *ta = arg;
6453 	struct tog_blame_cb_args *a = ta->cb_args;
6454 	int errcode, fd1 = -1, fd2 = -1;
6455 	FILE *f1 = NULL, *f2 = NULL;
6456 
6457 	fd1 = got_opentempfd();
6458 	if (fd1 == -1)
6459 		return (void *)got_error_from_errno("got_opentempfd");
6460 
6461 	fd2 = got_opentempfd();
6462 	if (fd2 == -1) {
6463 		err = got_error_from_errno("got_opentempfd");
6464 		goto done;
6465 	}
6466 
6467 	f1 = got_opentemp();
6468 	if (f1 == NULL) {
6469 		err = (void *)got_error_from_errno("got_opentemp");
6470 		goto done;
6471 	}
6472 	f2 = got_opentemp();
6473 	if (f2 == NULL) {
6474 		err = (void *)got_error_from_errno("got_opentemp");
6475 		goto done;
6476 	}
6477 
6478 	err = block_signals_used_by_main_thread();
6479 	if (err)
6480 		goto done;
6481 
6482 	err = got_blame(ta->path, a->commit_id, ta->repo,
6483 	    tog_diff_algo, blame_cb, ta->cb_args,
6484 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6485 	if (err && err->code == GOT_ERR_CANCELLED)
6486 		err = NULL;
6487 
6488 	errcode = pthread_mutex_lock(&tog_mutex);
6489 	if (errcode) {
6490 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6491 		goto done;
6492 	}
6493 
6494 	close_err = got_repo_close(ta->repo);
6495 	if (err == NULL)
6496 		err = close_err;
6497 	ta->repo = NULL;
6498 	*ta->complete = 1;
6499 
6500 	if (tog_io.wait_for_ui) {
6501 		errcode = pthread_cond_signal(&ta->blame_complete);
6502 		if (errcode && err == NULL)
6503 			err = got_error_set_errno(errcode,
6504 			    "pthread_cond_signal");
6505 	}
6506 
6507 	errcode = pthread_mutex_unlock(&tog_mutex);
6508 	if (errcode && err == NULL)
6509 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6510 
6511 done:
6512 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6513 		err = got_error_from_errno("close");
6514 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6515 		err = got_error_from_errno("close");
6516 	if (f1 && fclose(f1) == EOF && err == NULL)
6517 		err = got_error_from_errno("fclose");
6518 	if (f2 && fclose(f2) == EOF && err == NULL)
6519 		err = got_error_from_errno("fclose");
6520 
6521 	return (void *)err;
6522 }
6523 
6524 static struct got_object_id *
6525 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6526     int first_displayed_line, int selected_line)
6527 {
6528 	struct tog_blame_line *line;
6529 
6530 	if (nlines <= 0)
6531 		return NULL;
6532 
6533 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6534 	if (!line->annotated)
6535 		return NULL;
6536 
6537 	return line->id;
6538 }
6539 
6540 static struct got_object_id *
6541 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6542     int lineno)
6543 {
6544 	struct tog_blame_line *line;
6545 
6546 	if (nlines <= 0 || lineno >= nlines)
6547 		return NULL;
6548 
6549 	line = &lines[lineno - 1];
6550 	if (!line->annotated)
6551 		return NULL;
6552 
6553 	return line->id;
6554 }
6555 
6556 static const struct got_error *
6557 stop_blame(struct tog_blame *blame)
6558 {
6559 	const struct got_error *err = NULL;
6560 	int i;
6561 
6562 	if (blame->thread) {
6563 		int errcode;
6564 		errcode = pthread_mutex_unlock(&tog_mutex);
6565 		if (errcode)
6566 			return got_error_set_errno(errcode,
6567 			    "pthread_mutex_unlock");
6568 		errcode = pthread_join(blame->thread, (void **)&err);
6569 		if (errcode)
6570 			return got_error_set_errno(errcode, "pthread_join");
6571 		errcode = pthread_mutex_lock(&tog_mutex);
6572 		if (errcode)
6573 			return got_error_set_errno(errcode,
6574 			    "pthread_mutex_lock");
6575 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6576 			err = NULL;
6577 		blame->thread = NULL;
6578 	}
6579 	if (blame->thread_args.repo) {
6580 		const struct got_error *close_err;
6581 		close_err = got_repo_close(blame->thread_args.repo);
6582 		if (err == NULL)
6583 			err = close_err;
6584 		blame->thread_args.repo = NULL;
6585 	}
6586 	if (blame->f) {
6587 		if (fclose(blame->f) == EOF && err == NULL)
6588 			err = got_error_from_errno("fclose");
6589 		blame->f = NULL;
6590 	}
6591 	if (blame->lines) {
6592 		for (i = 0; i < blame->nlines; i++)
6593 			free(blame->lines[i].id);
6594 		free(blame->lines);
6595 		blame->lines = NULL;
6596 	}
6597 	free(blame->cb_args.commit_id);
6598 	blame->cb_args.commit_id = NULL;
6599 	if (blame->pack_fds) {
6600 		const struct got_error *pack_err =
6601 		    got_repo_pack_fds_close(blame->pack_fds);
6602 		if (err == NULL)
6603 			err = pack_err;
6604 		blame->pack_fds = NULL;
6605 	}
6606 	return err;
6607 }
6608 
6609 static const struct got_error *
6610 cancel_blame_view(void *arg)
6611 {
6612 	const struct got_error *err = NULL;
6613 	int *done = arg;
6614 	int errcode;
6615 
6616 	errcode = pthread_mutex_lock(&tog_mutex);
6617 	if (errcode)
6618 		return got_error_set_errno(errcode,
6619 		    "pthread_mutex_unlock");
6620 
6621 	if (*done)
6622 		err = got_error(GOT_ERR_CANCELLED);
6623 
6624 	errcode = pthread_mutex_unlock(&tog_mutex);
6625 	if (errcode)
6626 		return got_error_set_errno(errcode,
6627 		    "pthread_mutex_lock");
6628 
6629 	return err;
6630 }
6631 
6632 static const struct got_error *
6633 run_blame(struct tog_view *view)
6634 {
6635 	struct tog_blame_view_state *s = &view->state.blame;
6636 	struct tog_blame *blame = &s->blame;
6637 	const struct got_error *err = NULL;
6638 	struct got_commit_object *commit = NULL;
6639 	struct got_blob_object *blob = NULL;
6640 	struct got_repository *thread_repo = NULL;
6641 	struct got_object_id *obj_id = NULL;
6642 	int obj_type, fd = -1;
6643 	int *pack_fds = NULL;
6644 
6645 	err = got_object_open_as_commit(&commit, s->repo,
6646 	    &s->blamed_commit->id);
6647 	if (err)
6648 		return err;
6649 
6650 	fd = got_opentempfd();
6651 	if (fd == -1) {
6652 		err = got_error_from_errno("got_opentempfd");
6653 		goto done;
6654 	}
6655 
6656 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6657 	if (err)
6658 		goto done;
6659 
6660 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6661 	if (err)
6662 		goto done;
6663 
6664 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6665 		err = got_error(GOT_ERR_OBJ_TYPE);
6666 		goto done;
6667 	}
6668 
6669 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6670 	if (err)
6671 		goto done;
6672 	blame->f = got_opentemp();
6673 	if (blame->f == NULL) {
6674 		err = got_error_from_errno("got_opentemp");
6675 		goto done;
6676 	}
6677 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6678 	    &blame->line_offsets, blame->f, blob);
6679 	if (err)
6680 		goto done;
6681 	if (blame->nlines == 0) {
6682 		s->blame_complete = 1;
6683 		goto done;
6684 	}
6685 
6686 	/* Don't include \n at EOF in the blame line count. */
6687 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6688 		blame->nlines--;
6689 
6690 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6691 	if (blame->lines == NULL) {
6692 		err = got_error_from_errno("calloc");
6693 		goto done;
6694 	}
6695 
6696 	err = got_repo_pack_fds_open(&pack_fds);
6697 	if (err)
6698 		goto done;
6699 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6700 	    pack_fds);
6701 	if (err)
6702 		goto done;
6703 
6704 	blame->pack_fds = pack_fds;
6705 	blame->cb_args.view = view;
6706 	blame->cb_args.lines = blame->lines;
6707 	blame->cb_args.nlines = blame->nlines;
6708 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6709 	if (blame->cb_args.commit_id == NULL) {
6710 		err = got_error_from_errno("got_object_id_dup");
6711 		goto done;
6712 	}
6713 	blame->cb_args.quit = &s->done;
6714 
6715 	blame->thread_args.path = s->path;
6716 	blame->thread_args.repo = thread_repo;
6717 	blame->thread_args.cb_args = &blame->cb_args;
6718 	blame->thread_args.complete = &s->blame_complete;
6719 	blame->thread_args.cancel_cb = cancel_blame_view;
6720 	blame->thread_args.cancel_arg = &s->done;
6721 	s->blame_complete = 0;
6722 
6723 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6724 		s->first_displayed_line = 1;
6725 		s->last_displayed_line = view->nlines;
6726 		s->selected_line = 1;
6727 	}
6728 	s->matched_line = 0;
6729 
6730 done:
6731 	if (commit)
6732 		got_object_commit_close(commit);
6733 	if (fd != -1 && close(fd) == -1 && err == NULL)
6734 		err = got_error_from_errno("close");
6735 	if (blob)
6736 		got_object_blob_close(blob);
6737 	free(obj_id);
6738 	if (err)
6739 		stop_blame(blame);
6740 	return err;
6741 }
6742 
6743 static const struct got_error *
6744 open_blame_view(struct tog_view *view, char *path,
6745     struct got_object_id *commit_id, struct got_repository *repo)
6746 {
6747 	const struct got_error *err = NULL;
6748 	struct tog_blame_view_state *s = &view->state.blame;
6749 
6750 	STAILQ_INIT(&s->blamed_commits);
6751 
6752 	s->path = strdup(path);
6753 	if (s->path == NULL)
6754 		return got_error_from_errno("strdup");
6755 
6756 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6757 	if (err) {
6758 		free(s->path);
6759 		return err;
6760 	}
6761 
6762 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6763 	s->first_displayed_line = 1;
6764 	s->last_displayed_line = view->nlines;
6765 	s->selected_line = 1;
6766 	s->blame_complete = 0;
6767 	s->repo = repo;
6768 	s->commit_id = commit_id;
6769 	memset(&s->blame, 0, sizeof(s->blame));
6770 
6771 	STAILQ_INIT(&s->colors);
6772 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6773 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6774 		    get_color_value("TOG_COLOR_COMMIT"));
6775 		if (err)
6776 			return err;
6777 	}
6778 
6779 	view->show = show_blame_view;
6780 	view->input = input_blame_view;
6781 	view->reset = reset_blame_view;
6782 	view->close = close_blame_view;
6783 	view->search_start = search_start_blame_view;
6784 	view->search_setup = search_setup_blame_view;
6785 	view->search_next = search_next_view_match;
6786 
6787 	if (using_mock_io) {
6788 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6789 		int rc;
6790 
6791 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6792 		if (rc)
6793 			return got_error_set_errno(rc, "pthread_cond_init");
6794 	}
6795 
6796 	return run_blame(view);
6797 }
6798 
6799 static const struct got_error *
6800 close_blame_view(struct tog_view *view)
6801 {
6802 	const struct got_error *err = NULL;
6803 	struct tog_blame_view_state *s = &view->state.blame;
6804 
6805 	if (s->blame.thread)
6806 		err = stop_blame(&s->blame);
6807 
6808 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6809 		struct got_object_qid *blamed_commit;
6810 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6811 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6812 		got_object_qid_free(blamed_commit);
6813 	}
6814 
6815 	if (using_mock_io) {
6816 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6817 		int rc;
6818 
6819 		rc = pthread_cond_destroy(&bta->blame_complete);
6820 		if (rc && err == NULL)
6821 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6822 	}
6823 
6824 	free(s->path);
6825 	free_colors(&s->colors);
6826 	return err;
6827 }
6828 
6829 static const struct got_error *
6830 search_start_blame_view(struct tog_view *view)
6831 {
6832 	struct tog_blame_view_state *s = &view->state.blame;
6833 
6834 	s->matched_line = 0;
6835 	return NULL;
6836 }
6837 
6838 static void
6839 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6840     size_t *nlines, int **first, int **last, int **match, int **selected)
6841 {
6842 	struct tog_blame_view_state *s = &view->state.blame;
6843 
6844 	*f = s->blame.f;
6845 	*nlines = s->blame.nlines;
6846 	*line_offsets = s->blame.line_offsets;
6847 	*match = &s->matched_line;
6848 	*first = &s->first_displayed_line;
6849 	*last = &s->last_displayed_line;
6850 	*selected = &s->selected_line;
6851 }
6852 
6853 static const struct got_error *
6854 show_blame_view(struct tog_view *view)
6855 {
6856 	const struct got_error *err = NULL;
6857 	struct tog_blame_view_state *s = &view->state.blame;
6858 	int errcode;
6859 
6860 	if (s->blame.thread == NULL && !s->blame_complete) {
6861 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6862 		    &s->blame.thread_args);
6863 		if (errcode)
6864 			return got_error_set_errno(errcode, "pthread_create");
6865 
6866 		if (!using_mock_io)
6867 			halfdelay(1); /* fast refresh while annotating  */
6868 	}
6869 
6870 	if (s->blame_complete && !using_mock_io)
6871 		halfdelay(10); /* disable fast refresh */
6872 
6873 	err = draw_blame(view);
6874 
6875 	view_border(view);
6876 	return err;
6877 }
6878 
6879 static const struct got_error *
6880 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6881     struct got_repository *repo, struct got_object_id *id)
6882 {
6883 	struct tog_view		*log_view;
6884 	const struct got_error	*err = NULL;
6885 
6886 	*new_view = NULL;
6887 
6888 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6889 	if (log_view == NULL)
6890 		return got_error_from_errno("view_open");
6891 
6892 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6893 	if (err)
6894 		view_close(log_view);
6895 	else
6896 		*new_view = log_view;
6897 
6898 	return err;
6899 }
6900 
6901 static const struct got_error *
6902 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6903 {
6904 	const struct got_error *err = NULL, *thread_err = NULL;
6905 	struct tog_view *diff_view;
6906 	struct tog_blame_view_state *s = &view->state.blame;
6907 	int eos, nscroll, begin_y = 0, begin_x = 0;
6908 
6909 	eos = nscroll = view->nlines - 2;
6910 	if (view_is_hsplit_top(view))
6911 		--eos;  /* border */
6912 
6913 	switch (ch) {
6914 	case '0':
6915 	case '$':
6916 	case KEY_RIGHT:
6917 	case 'l':
6918 	case KEY_LEFT:
6919 	case 'h':
6920 		horizontal_scroll_input(view, ch);
6921 		break;
6922 	case 'q':
6923 		s->done = 1;
6924 		break;
6925 	case 'g':
6926 	case KEY_HOME:
6927 		s->selected_line = 1;
6928 		s->first_displayed_line = 1;
6929 		view->count = 0;
6930 		break;
6931 	case 'G':
6932 	case KEY_END:
6933 		if (s->blame.nlines < eos) {
6934 			s->selected_line = s->blame.nlines;
6935 			s->first_displayed_line = 1;
6936 		} else {
6937 			s->selected_line = eos;
6938 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6939 		}
6940 		view->count = 0;
6941 		break;
6942 	case 'k':
6943 	case KEY_UP:
6944 	case CTRL('p'):
6945 		if (s->selected_line > 1)
6946 			s->selected_line--;
6947 		else if (s->selected_line == 1 &&
6948 		    s->first_displayed_line > 1)
6949 			s->first_displayed_line--;
6950 		else
6951 			view->count = 0;
6952 		break;
6953 	case CTRL('u'):
6954 	case 'u':
6955 		nscroll /= 2;
6956 		/* FALL THROUGH */
6957 	case KEY_PPAGE:
6958 	case CTRL('b'):
6959 	case 'b':
6960 		if (s->first_displayed_line == 1) {
6961 			if (view->count > 1)
6962 				nscroll += nscroll;
6963 			s->selected_line = MAX(1, s->selected_line - nscroll);
6964 			view->count = 0;
6965 			break;
6966 		}
6967 		if (s->first_displayed_line > nscroll)
6968 			s->first_displayed_line -= nscroll;
6969 		else
6970 			s->first_displayed_line = 1;
6971 		break;
6972 	case 'j':
6973 	case KEY_DOWN:
6974 	case CTRL('n'):
6975 		if (s->selected_line < eos && s->first_displayed_line +
6976 		    s->selected_line <= s->blame.nlines)
6977 			s->selected_line++;
6978 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6979 			s->first_displayed_line++;
6980 		else
6981 			view->count = 0;
6982 		break;
6983 	case 'c':
6984 	case 'p': {
6985 		struct got_object_id *id = NULL;
6986 
6987 		view->count = 0;
6988 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6989 		    s->first_displayed_line, s->selected_line);
6990 		if (id == NULL)
6991 			break;
6992 		if (ch == 'p') {
6993 			struct got_commit_object *commit, *pcommit;
6994 			struct got_object_qid *pid;
6995 			struct got_object_id *blob_id = NULL;
6996 			int obj_type;
6997 			err = got_object_open_as_commit(&commit,
6998 			    s->repo, id);
6999 			if (err)
7000 				break;
7001 			pid = STAILQ_FIRST(
7002 			    got_object_commit_get_parent_ids(commit));
7003 			if (pid == NULL) {
7004 				got_object_commit_close(commit);
7005 				break;
7006 			}
7007 			/* Check if path history ends here. */
7008 			err = got_object_open_as_commit(&pcommit,
7009 			    s->repo, &pid->id);
7010 			if (err)
7011 				break;
7012 			err = got_object_id_by_path(&blob_id, s->repo,
7013 			    pcommit, s->path);
7014 			got_object_commit_close(pcommit);
7015 			if (err) {
7016 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7017 					err = NULL;
7018 				got_object_commit_close(commit);
7019 				break;
7020 			}
7021 			err = got_object_get_type(&obj_type, s->repo,
7022 			    blob_id);
7023 			free(blob_id);
7024 			/* Can't blame non-blob type objects. */
7025 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7026 				got_object_commit_close(commit);
7027 				break;
7028 			}
7029 			err = got_object_qid_alloc(&s->blamed_commit,
7030 			    &pid->id);
7031 			got_object_commit_close(commit);
7032 		} else {
7033 			if (got_object_id_cmp(id,
7034 			    &s->blamed_commit->id) == 0)
7035 				break;
7036 			err = got_object_qid_alloc(&s->blamed_commit,
7037 			    id);
7038 		}
7039 		if (err)
7040 			break;
7041 		s->done = 1;
7042 		thread_err = stop_blame(&s->blame);
7043 		s->done = 0;
7044 		if (thread_err)
7045 			break;
7046 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7047 		    s->blamed_commit, entry);
7048 		err = run_blame(view);
7049 		if (err)
7050 			break;
7051 		break;
7052 	}
7053 	case 'C': {
7054 		struct got_object_qid *first;
7055 
7056 		view->count = 0;
7057 		first = STAILQ_FIRST(&s->blamed_commits);
7058 		if (!got_object_id_cmp(&first->id, s->commit_id))
7059 			break;
7060 		s->done = 1;
7061 		thread_err = stop_blame(&s->blame);
7062 		s->done = 0;
7063 		if (thread_err)
7064 			break;
7065 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7066 		got_object_qid_free(s->blamed_commit);
7067 		s->blamed_commit =
7068 		    STAILQ_FIRST(&s->blamed_commits);
7069 		err = run_blame(view);
7070 		if (err)
7071 			break;
7072 		break;
7073 	}
7074 	case 'L':
7075 		view->count = 0;
7076 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7077 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7078 		if (s->id_to_log)
7079 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7080 		break;
7081 	case KEY_ENTER:
7082 	case '\r': {
7083 		struct got_object_id *id = NULL;
7084 		struct got_object_qid *pid;
7085 		struct got_commit_object *commit = NULL;
7086 
7087 		view->count = 0;
7088 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7089 		    s->first_displayed_line, s->selected_line);
7090 		if (id == NULL)
7091 			break;
7092 		err = got_object_open_as_commit(&commit, s->repo, id);
7093 		if (err)
7094 			break;
7095 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7096 		if (*new_view) {
7097 			/* traversed from diff view, release diff resources  */
7098 			err = close_diff_view(*new_view);
7099 			if (err)
7100 				break;
7101 			diff_view = *new_view;
7102 		} else {
7103 			if (view_is_parent_view(view))
7104 				view_get_split(view, &begin_y, &begin_x);
7105 
7106 			diff_view = view_open(0, 0, begin_y, begin_x,
7107 			    TOG_VIEW_DIFF);
7108 			if (diff_view == NULL) {
7109 				got_object_commit_close(commit);
7110 				err = got_error_from_errno("view_open");
7111 				break;
7112 			}
7113 		}
7114 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7115 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7116 		got_object_commit_close(commit);
7117 		if (err)
7118 			break;
7119 		s->last_diffed_line = s->first_displayed_line - 1 +
7120 		    s->selected_line;
7121 		if (*new_view)
7122 			break;	/* still open from active diff view */
7123 		if (view_is_parent_view(view) &&
7124 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7125 			err = view_init_hsplit(view, begin_y);
7126 			if (err)
7127 				break;
7128 		}
7129 
7130 		view->focussed = 0;
7131 		diff_view->focussed = 1;
7132 		diff_view->mode = view->mode;
7133 		diff_view->nlines = view->lines - begin_y;
7134 		if (view_is_parent_view(view)) {
7135 			view_transfer_size(diff_view, view);
7136 			err = view_close_child(view);
7137 			if (err)
7138 				break;
7139 			err = view_set_child(view, diff_view);
7140 			if (err)
7141 				break;
7142 			view->focus_child = 1;
7143 		} else
7144 			*new_view = diff_view;
7145 		if (err)
7146 			break;
7147 		break;
7148 	}
7149 	case CTRL('d'):
7150 	case 'd':
7151 		nscroll /= 2;
7152 		/* FALL THROUGH */
7153 	case KEY_NPAGE:
7154 	case CTRL('f'):
7155 	case 'f':
7156 	case ' ':
7157 		if (s->last_displayed_line >= s->blame.nlines &&
7158 		    s->selected_line >= MIN(s->blame.nlines,
7159 		    view->nlines - 2)) {
7160 			view->count = 0;
7161 			break;
7162 		}
7163 		if (s->last_displayed_line >= s->blame.nlines &&
7164 		    s->selected_line < view->nlines - 2) {
7165 			s->selected_line +=
7166 			    MIN(nscroll, s->last_displayed_line -
7167 			    s->first_displayed_line - s->selected_line + 1);
7168 		}
7169 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7170 			s->first_displayed_line += nscroll;
7171 		else
7172 			s->first_displayed_line =
7173 			    s->blame.nlines - (view->nlines - 3);
7174 		break;
7175 	case KEY_RESIZE:
7176 		if (s->selected_line > view->nlines - 2) {
7177 			s->selected_line = MIN(s->blame.nlines,
7178 			    view->nlines - 2);
7179 		}
7180 		break;
7181 	default:
7182 		view->count = 0;
7183 		break;
7184 	}
7185 	return thread_err ? thread_err : err;
7186 }
7187 
7188 static const struct got_error *
7189 reset_blame_view(struct tog_view *view)
7190 {
7191 	const struct got_error *err;
7192 	struct tog_blame_view_state *s = &view->state.blame;
7193 
7194 	view->count = 0;
7195 	s->done = 1;
7196 	err = stop_blame(&s->blame);
7197 	s->done = 0;
7198 	if (err)
7199 		return err;
7200 	return run_blame(view);
7201 }
7202 
7203 static const struct got_error *
7204 cmd_blame(int argc, char *argv[])
7205 {
7206 	const struct got_error *error;
7207 	struct got_repository *repo = NULL;
7208 	struct got_worktree *worktree = NULL;
7209 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7210 	char *link_target = NULL;
7211 	struct got_object_id *commit_id = NULL;
7212 	struct got_commit_object *commit = NULL;
7213 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7214 	int ch;
7215 	struct tog_view *view = NULL;
7216 	int *pack_fds = NULL;
7217 
7218 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7219 		switch (ch) {
7220 		case 'c':
7221 			commit_id_str = optarg;
7222 			break;
7223 		case 'r':
7224 			repo_path = realpath(optarg, NULL);
7225 			if (repo_path == NULL)
7226 				return got_error_from_errno2("realpath",
7227 				    optarg);
7228 			break;
7229 		default:
7230 			usage_blame();
7231 			/* NOTREACHED */
7232 		}
7233 	}
7234 
7235 	argc -= optind;
7236 	argv += optind;
7237 
7238 	if (argc != 1)
7239 		usage_blame();
7240 
7241 	error = got_repo_pack_fds_open(&pack_fds);
7242 	if (error != NULL)
7243 		goto done;
7244 
7245 	if (repo_path == NULL) {
7246 		cwd = getcwd(NULL, 0);
7247 		if (cwd == NULL)
7248 			return got_error_from_errno("getcwd");
7249 		error = got_worktree_open(&worktree, cwd, NULL);
7250 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7251 			goto done;
7252 		if (worktree)
7253 			repo_path =
7254 			    strdup(got_worktree_get_repo_path(worktree));
7255 		else
7256 			repo_path = strdup(cwd);
7257 		if (repo_path == NULL) {
7258 			error = got_error_from_errno("strdup");
7259 			goto done;
7260 		}
7261 	}
7262 
7263 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7264 	if (error != NULL)
7265 		goto done;
7266 
7267 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7268 	    worktree);
7269 	if (error)
7270 		goto done;
7271 
7272 	init_curses();
7273 
7274 	error = apply_unveil(got_repo_get_path(repo), NULL);
7275 	if (error)
7276 		goto done;
7277 
7278 	error = tog_load_refs(repo, 0);
7279 	if (error)
7280 		goto done;
7281 
7282 	if (commit_id_str == NULL) {
7283 		struct got_reference *head_ref;
7284 		error = got_ref_open(&head_ref, repo, worktree ?
7285 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7286 		if (error != NULL)
7287 			goto done;
7288 		error = got_ref_resolve(&commit_id, repo, head_ref);
7289 		got_ref_close(head_ref);
7290 	} else {
7291 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7292 		    repo, worktree);
7293 		if (error != NULL)
7294 			goto done;
7295 		if (keyword_idstr != NULL)
7296 			commit_id_str = keyword_idstr;
7297 
7298 		error = got_repo_match_object_id(&commit_id, NULL,
7299 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7300 	}
7301 	if (error != NULL)
7302 		goto done;
7303 
7304 	error = got_object_open_as_commit(&commit, repo, commit_id);
7305 	if (error)
7306 		goto done;
7307 
7308 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7309 	    commit, repo);
7310 	if (error)
7311 		goto done;
7312 
7313 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7314 	if (view == NULL) {
7315 		error = got_error_from_errno("view_open");
7316 		goto done;
7317 	}
7318 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7319 	    commit_id, repo);
7320 	if (error != NULL) {
7321 		if (view->close == NULL)
7322 			close_blame_view(view);
7323 		view_close(view);
7324 		goto done;
7325 	}
7326 
7327 	if (worktree) {
7328 		error = set_tog_base_commit(repo, worktree);
7329 		if (error != NULL)
7330 			goto done;
7331 
7332 		/* Release work tree lock. */
7333 		got_worktree_close(worktree);
7334 		worktree = NULL;
7335 	}
7336 
7337 	error = view_loop(view);
7338 
7339 done:
7340 	free(tog_base_commit.id);
7341 	free(repo_path);
7342 	free(in_repo_path);
7343 	free(link_target);
7344 	free(cwd);
7345 	free(commit_id);
7346 	free(keyword_idstr);
7347 	if (commit)
7348 		got_object_commit_close(commit);
7349 	if (worktree)
7350 		got_worktree_close(worktree);
7351 	if (repo) {
7352 		const struct got_error *close_err = got_repo_close(repo);
7353 		if (error == NULL)
7354 			error = close_err;
7355 	}
7356 	if (pack_fds) {
7357 		const struct got_error *pack_err =
7358 		    got_repo_pack_fds_close(pack_fds);
7359 		if (error == NULL)
7360 			error = pack_err;
7361 	}
7362 	tog_free_refs();
7363 	return error;
7364 }
7365 
7366 static const struct got_error *
7367 draw_tree_entries(struct tog_view *view, const char *parent_path)
7368 {
7369 	struct tog_tree_view_state *s = &view->state.tree;
7370 	const struct got_error *err = NULL;
7371 	struct got_tree_entry *te;
7372 	wchar_t *wline;
7373 	char *index = NULL;
7374 	struct tog_color *tc;
7375 	int width, n, nentries, scrollx, i = 1;
7376 	int limit = view->nlines;
7377 
7378 	s->ndisplayed = 0;
7379 	if (view_is_hsplit_top(view))
7380 		--limit;  /* border */
7381 
7382 	werase(view->window);
7383 
7384 	if (limit == 0)
7385 		return NULL;
7386 
7387 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7388 	    0, 0);
7389 	if (err)
7390 		return err;
7391 	if (view_needs_focus_indication(view))
7392 		wstandout(view->window);
7393 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7394 	if (tc)
7395 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7396 	waddwstr(view->window, wline);
7397 	free(wline);
7398 	wline = NULL;
7399 	while (width++ < view->ncols)
7400 		waddch(view->window, ' ');
7401 	if (tc)
7402 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7403 	if (view_needs_focus_indication(view))
7404 		wstandend(view->window);
7405 	if (--limit <= 0)
7406 		return NULL;
7407 
7408 	i += s->selected;
7409 	if (s->first_displayed_entry) {
7410 		i += got_tree_entry_get_index(s->first_displayed_entry);
7411 		if (s->tree != s->root)
7412 			++i;  /* account for ".." entry */
7413 	}
7414 	nentries = got_object_tree_get_nentries(s->tree);
7415 	if (asprintf(&index, "[%d/%d] %s",
7416 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7417 		return got_error_from_errno("asprintf");
7418 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7419 	free(index);
7420 	if (err)
7421 		return err;
7422 	waddwstr(view->window, wline);
7423 	free(wline);
7424 	wline = NULL;
7425 	if (width < view->ncols - 1)
7426 		waddch(view->window, '\n');
7427 	if (--limit <= 0)
7428 		return NULL;
7429 	waddch(view->window, '\n');
7430 	if (--limit <= 0)
7431 		return NULL;
7432 
7433 	if (s->first_displayed_entry == NULL) {
7434 		te = got_object_tree_get_first_entry(s->tree);
7435 		if (s->selected == 0) {
7436 			if (view->focussed)
7437 				wstandout(view->window);
7438 			s->selected_entry = NULL;
7439 		}
7440 		waddstr(view->window, "  ..\n");	/* parent directory */
7441 		if (s->selected == 0 && view->focussed)
7442 			wstandend(view->window);
7443 		s->ndisplayed++;
7444 		if (--limit <= 0)
7445 			return NULL;
7446 		n = 1;
7447 	} else {
7448 		n = 0;
7449 		te = s->first_displayed_entry;
7450 	}
7451 
7452 	view->maxx = 0;
7453 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7454 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7455 		const char *modestr = "";
7456 		mode_t mode;
7457 
7458 		te = got_object_tree_get_entry(s->tree, i);
7459 		mode = got_tree_entry_get_mode(te);
7460 
7461 		if (s->show_ids) {
7462 			err = got_object_id_str(&id_str,
7463 			    got_tree_entry_get_id(te));
7464 			if (err)
7465 				return got_error_from_errno(
7466 				    "got_object_id_str");
7467 		}
7468 		if (got_object_tree_entry_is_submodule(te))
7469 			modestr = "$";
7470 		else if (S_ISLNK(mode)) {
7471 			int i;
7472 
7473 			err = got_tree_entry_get_symlink_target(&link_target,
7474 			    te, s->repo);
7475 			if (err) {
7476 				free(id_str);
7477 				return err;
7478 			}
7479 			for (i = 0; link_target[i] != '\0'; i++) {
7480 				if (!isprint((unsigned char)link_target[i]))
7481 					link_target[i] = '?';
7482 			}
7483 			modestr = "@";
7484 		}
7485 		else if (S_ISDIR(mode))
7486 			modestr = "/";
7487 		else if (mode & S_IXUSR)
7488 			modestr = "*";
7489 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7490 		    got_tree_entry_get_name(te), modestr,
7491 		    link_target ? " -> ": "",
7492 		    link_target ? link_target : "") == -1) {
7493 			free(id_str);
7494 			free(link_target);
7495 			return got_error_from_errno("asprintf");
7496 		}
7497 		free(id_str);
7498 		free(link_target);
7499 
7500 		/* use full line width to determine view->maxx */
7501 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7502 		if (err) {
7503 			free(line);
7504 			break;
7505 		}
7506 		view->maxx = MAX(view->maxx, width);
7507 		free(wline);
7508 		wline = NULL;
7509 
7510 		err = format_line(&wline, &width, &scrollx, line, view->x,
7511 		    view->ncols, 0, 0);
7512 		if (err) {
7513 			free(line);
7514 			break;
7515 		}
7516 		if (n == s->selected) {
7517 			if (view->focussed)
7518 				wstandout(view->window);
7519 			s->selected_entry = te;
7520 		}
7521 		tc = match_color(&s->colors, line);
7522 		if (tc)
7523 			wattr_on(view->window,
7524 			    COLOR_PAIR(tc->colorpair), NULL);
7525 		waddwstr(view->window, &wline[scrollx]);
7526 		if (tc)
7527 			wattr_off(view->window,
7528 			    COLOR_PAIR(tc->colorpair), NULL);
7529 		if (width < view->ncols)
7530 			waddch(view->window, '\n');
7531 		if (n == s->selected && view->focussed)
7532 			wstandend(view->window);
7533 		free(line);
7534 		free(wline);
7535 		wline = NULL;
7536 		n++;
7537 		s->ndisplayed++;
7538 		s->last_displayed_entry = te;
7539 		if (--limit <= 0)
7540 			break;
7541 	}
7542 
7543 	return err;
7544 }
7545 
7546 static void
7547 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7548 {
7549 	struct got_tree_entry *te;
7550 	int isroot = s->tree == s->root;
7551 	int i = 0;
7552 
7553 	if (s->first_displayed_entry == NULL)
7554 		return;
7555 
7556 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7557 	while (i++ < maxscroll) {
7558 		if (te == NULL) {
7559 			if (!isroot)
7560 				s->first_displayed_entry = NULL;
7561 			break;
7562 		}
7563 		s->first_displayed_entry = te;
7564 		te = got_tree_entry_get_prev(s->tree, te);
7565 	}
7566 }
7567 
7568 static const struct got_error *
7569 tree_scroll_down(struct tog_view *view, int maxscroll)
7570 {
7571 	struct tog_tree_view_state *s = &view->state.tree;
7572 	struct got_tree_entry *next, *last;
7573 	int n = 0;
7574 
7575 	if (s->first_displayed_entry)
7576 		next = got_tree_entry_get_next(s->tree,
7577 		    s->first_displayed_entry);
7578 	else
7579 		next = got_object_tree_get_first_entry(s->tree);
7580 
7581 	last = s->last_displayed_entry;
7582 	while (next && n++ < maxscroll) {
7583 		if (last) {
7584 			s->last_displayed_entry = last;
7585 			last = got_tree_entry_get_next(s->tree, last);
7586 		}
7587 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7588 			s->first_displayed_entry = next;
7589 			next = got_tree_entry_get_next(s->tree, next);
7590 		}
7591 	}
7592 
7593 	return NULL;
7594 }
7595 
7596 static const struct got_error *
7597 tree_entry_path(char **path, struct tog_parent_trees *parents,
7598     struct got_tree_entry *te)
7599 {
7600 	const struct got_error *err = NULL;
7601 	struct tog_parent_tree *pt;
7602 	size_t len = 2; /* for leading slash and NUL */
7603 
7604 	TAILQ_FOREACH(pt, parents, entry)
7605 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7606 		    + 1 /* slash */;
7607 	if (te)
7608 		len += strlen(got_tree_entry_get_name(te));
7609 
7610 	*path = calloc(1, len);
7611 	if (path == NULL)
7612 		return got_error_from_errno("calloc");
7613 
7614 	(*path)[0] = '/';
7615 	pt = TAILQ_LAST(parents, tog_parent_trees);
7616 	while (pt) {
7617 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7618 		if (strlcat(*path, name, len) >= len) {
7619 			err = got_error(GOT_ERR_NO_SPACE);
7620 			goto done;
7621 		}
7622 		if (strlcat(*path, "/", len) >= len) {
7623 			err = got_error(GOT_ERR_NO_SPACE);
7624 			goto done;
7625 		}
7626 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7627 	}
7628 	if (te) {
7629 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7630 			err = got_error(GOT_ERR_NO_SPACE);
7631 			goto done;
7632 		}
7633 	}
7634 done:
7635 	if (err) {
7636 		free(*path);
7637 		*path = NULL;
7638 	}
7639 	return err;
7640 }
7641 
7642 static const struct got_error *
7643 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7644     struct got_tree_entry *te, struct tog_parent_trees *parents,
7645     struct got_object_id *commit_id, struct got_repository *repo)
7646 {
7647 	const struct got_error *err = NULL;
7648 	char *path;
7649 	struct tog_view *blame_view;
7650 
7651 	*new_view = NULL;
7652 
7653 	err = tree_entry_path(&path, parents, te);
7654 	if (err)
7655 		return err;
7656 
7657 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7658 	if (blame_view == NULL) {
7659 		err = got_error_from_errno("view_open");
7660 		goto done;
7661 	}
7662 
7663 	err = open_blame_view(blame_view, path, commit_id, repo);
7664 	if (err) {
7665 		if (err->code == GOT_ERR_CANCELLED)
7666 			err = NULL;
7667 		view_close(blame_view);
7668 	} else
7669 		*new_view = blame_view;
7670 done:
7671 	free(path);
7672 	return err;
7673 }
7674 
7675 static const struct got_error *
7676 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7677     struct tog_tree_view_state *s)
7678 {
7679 	struct tog_view *log_view;
7680 	const struct got_error *err = NULL;
7681 	char *path;
7682 
7683 	*new_view = NULL;
7684 
7685 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7686 	if (log_view == NULL)
7687 		return got_error_from_errno("view_open");
7688 
7689 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7690 	if (err)
7691 		return err;
7692 
7693 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7694 	    path, 0, NULL);
7695 	if (err)
7696 		view_close(log_view);
7697 	else
7698 		*new_view = log_view;
7699 	free(path);
7700 	return err;
7701 }
7702 
7703 static const struct got_error *
7704 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7705     const char *head_ref_name, struct got_repository *repo)
7706 {
7707 	const struct got_error *err = NULL;
7708 	char *commit_id_str = NULL;
7709 	struct tog_tree_view_state *s = &view->state.tree;
7710 	struct got_commit_object *commit = NULL;
7711 
7712 	TAILQ_INIT(&s->parents);
7713 	STAILQ_INIT(&s->colors);
7714 
7715 	s->commit_id = got_object_id_dup(commit_id);
7716 	if (s->commit_id == NULL) {
7717 		err = got_error_from_errno("got_object_id_dup");
7718 		goto done;
7719 	}
7720 
7721 	err = got_object_open_as_commit(&commit, repo, commit_id);
7722 	if (err)
7723 		goto done;
7724 
7725 	/*
7726 	 * The root is opened here and will be closed when the view is closed.
7727 	 * Any visited subtrees and their path-wise parents are opened and
7728 	 * closed on demand.
7729 	 */
7730 	err = got_object_open_as_tree(&s->root, repo,
7731 	    got_object_commit_get_tree_id(commit));
7732 	if (err)
7733 		goto done;
7734 	s->tree = s->root;
7735 
7736 	err = got_object_id_str(&commit_id_str, commit_id);
7737 	if (err != NULL)
7738 		goto done;
7739 
7740 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7741 		err = got_error_from_errno("asprintf");
7742 		goto done;
7743 	}
7744 
7745 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7746 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7747 	if (head_ref_name) {
7748 		s->head_ref_name = strdup(head_ref_name);
7749 		if (s->head_ref_name == NULL) {
7750 			err = got_error_from_errno("strdup");
7751 			goto done;
7752 		}
7753 	}
7754 	s->repo = repo;
7755 
7756 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7757 		err = add_color(&s->colors, "\\$$",
7758 		    TOG_COLOR_TREE_SUBMODULE,
7759 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7760 		if (err)
7761 			goto done;
7762 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7763 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7764 		if (err)
7765 			goto done;
7766 		err = add_color(&s->colors, "/$",
7767 		    TOG_COLOR_TREE_DIRECTORY,
7768 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7769 		if (err)
7770 			goto done;
7771 
7772 		err = add_color(&s->colors, "\\*$",
7773 		    TOG_COLOR_TREE_EXECUTABLE,
7774 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7775 		if (err)
7776 			goto done;
7777 
7778 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7779 		    get_color_value("TOG_COLOR_COMMIT"));
7780 		if (err)
7781 			goto done;
7782 	}
7783 
7784 	view->show = show_tree_view;
7785 	view->input = input_tree_view;
7786 	view->close = close_tree_view;
7787 	view->search_start = search_start_tree_view;
7788 	view->search_next = search_next_tree_view;
7789 done:
7790 	free(commit_id_str);
7791 	if (commit)
7792 		got_object_commit_close(commit);
7793 	if (err) {
7794 		if (view->close == NULL)
7795 			close_tree_view(view);
7796 		view_close(view);
7797 	}
7798 	return err;
7799 }
7800 
7801 static const struct got_error *
7802 close_tree_view(struct tog_view *view)
7803 {
7804 	struct tog_tree_view_state *s = &view->state.tree;
7805 
7806 	free_colors(&s->colors);
7807 	free(s->tree_label);
7808 	s->tree_label = NULL;
7809 	free(s->commit_id);
7810 	s->commit_id = NULL;
7811 	free(s->head_ref_name);
7812 	s->head_ref_name = NULL;
7813 	while (!TAILQ_EMPTY(&s->parents)) {
7814 		struct tog_parent_tree *parent;
7815 		parent = TAILQ_FIRST(&s->parents);
7816 		TAILQ_REMOVE(&s->parents, parent, entry);
7817 		if (parent->tree != s->root)
7818 			got_object_tree_close(parent->tree);
7819 		free(parent);
7820 
7821 	}
7822 	if (s->tree != NULL && s->tree != s->root)
7823 		got_object_tree_close(s->tree);
7824 	if (s->root)
7825 		got_object_tree_close(s->root);
7826 	return NULL;
7827 }
7828 
7829 static const struct got_error *
7830 search_start_tree_view(struct tog_view *view)
7831 {
7832 	struct tog_tree_view_state *s = &view->state.tree;
7833 
7834 	s->matched_entry = NULL;
7835 	return NULL;
7836 }
7837 
7838 static int
7839 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7840 {
7841 	regmatch_t regmatch;
7842 
7843 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7844 	    0) == 0;
7845 }
7846 
7847 static const struct got_error *
7848 search_next_tree_view(struct tog_view *view)
7849 {
7850 	struct tog_tree_view_state *s = &view->state.tree;
7851 	struct got_tree_entry *te = NULL;
7852 
7853 	if (!view->searching) {
7854 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7855 		return NULL;
7856 	}
7857 
7858 	if (s->matched_entry) {
7859 		if (view->searching == TOG_SEARCH_FORWARD) {
7860 			if (s->selected_entry)
7861 				te = got_tree_entry_get_next(s->tree,
7862 				    s->selected_entry);
7863 			else
7864 				te = got_object_tree_get_first_entry(s->tree);
7865 		} else {
7866 			if (s->selected_entry == NULL)
7867 				te = got_object_tree_get_last_entry(s->tree);
7868 			else
7869 				te = got_tree_entry_get_prev(s->tree,
7870 				    s->selected_entry);
7871 		}
7872 	} else {
7873 		if (s->selected_entry)
7874 			te = s->selected_entry;
7875 		else if (view->searching == TOG_SEARCH_FORWARD)
7876 			te = got_object_tree_get_first_entry(s->tree);
7877 		else
7878 			te = got_object_tree_get_last_entry(s->tree);
7879 	}
7880 
7881 	while (1) {
7882 		if (te == NULL) {
7883 			if (s->matched_entry == NULL) {
7884 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7885 				return NULL;
7886 			}
7887 			if (view->searching == TOG_SEARCH_FORWARD)
7888 				te = got_object_tree_get_first_entry(s->tree);
7889 			else
7890 				te = got_object_tree_get_last_entry(s->tree);
7891 		}
7892 
7893 		if (match_tree_entry(te, &view->regex)) {
7894 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7895 			s->matched_entry = te;
7896 			break;
7897 		}
7898 
7899 		if (view->searching == TOG_SEARCH_FORWARD)
7900 			te = got_tree_entry_get_next(s->tree, te);
7901 		else
7902 			te = got_tree_entry_get_prev(s->tree, te);
7903 	}
7904 
7905 	if (s->matched_entry) {
7906 		s->first_displayed_entry = s->matched_entry;
7907 		s->selected = 0;
7908 	}
7909 
7910 	return NULL;
7911 }
7912 
7913 static const struct got_error *
7914 show_tree_view(struct tog_view *view)
7915 {
7916 	const struct got_error *err = NULL;
7917 	struct tog_tree_view_state *s = &view->state.tree;
7918 	char *parent_path;
7919 
7920 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7921 	if (err)
7922 		return err;
7923 
7924 	err = draw_tree_entries(view, parent_path);
7925 	free(parent_path);
7926 
7927 	view_border(view);
7928 	return err;
7929 }
7930 
7931 static const struct got_error *
7932 tree_goto_line(struct tog_view *view, int nlines)
7933 {
7934 	const struct got_error		 *err = NULL;
7935 	struct tog_tree_view_state	 *s = &view->state.tree;
7936 	struct got_tree_entry		**fte, **lte, **ste;
7937 	int				  g, last, first = 1, i = 1;
7938 	int				  root = s->tree == s->root;
7939 	int				  off = root ? 1 : 2;
7940 
7941 	g = view->gline;
7942 	view->gline = 0;
7943 
7944 	if (g == 0)
7945 		g = 1;
7946 	else if (g > got_object_tree_get_nentries(s->tree))
7947 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7948 
7949 	fte = &s->first_displayed_entry;
7950 	lte = &s->last_displayed_entry;
7951 	ste = &s->selected_entry;
7952 
7953 	if (*fte != NULL) {
7954 		first = got_tree_entry_get_index(*fte);
7955 		first += off;  /* account for ".." */
7956 	}
7957 	last = got_tree_entry_get_index(*lte);
7958 	last += off;
7959 
7960 	if (g >= first && g <= last && g - first < nlines) {
7961 		s->selected = g - first;
7962 		return NULL;	/* gline is on the current page */
7963 	}
7964 
7965 	if (*ste != NULL) {
7966 		i = got_tree_entry_get_index(*ste);
7967 		i += off;
7968 	}
7969 
7970 	if (i < g) {
7971 		err = tree_scroll_down(view, g - i);
7972 		if (err)
7973 			return err;
7974 		if (got_tree_entry_get_index(*lte) >=
7975 		    got_object_tree_get_nentries(s->tree) - 1 &&
7976 		    first + s->selected < g &&
7977 		    s->selected < s->ndisplayed - 1) {
7978 			first = got_tree_entry_get_index(*fte);
7979 			first += off;
7980 			s->selected = g - first;
7981 		}
7982 	} else if (i > g)
7983 		tree_scroll_up(s, i - g);
7984 
7985 	if (g < nlines &&
7986 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7987 		s->selected = g - 1;
7988 
7989 	return NULL;
7990 }
7991 
7992 static const struct got_error *
7993 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7994 {
7995 	const struct got_error *err = NULL;
7996 	struct tog_tree_view_state *s = &view->state.tree;
7997 	struct got_tree_entry *te;
7998 	int n, nscroll = view->nlines - 3;
7999 
8000 	if (view->gline)
8001 		return tree_goto_line(view, nscroll);
8002 
8003 	switch (ch) {
8004 	case '0':
8005 	case '$':
8006 	case KEY_RIGHT:
8007 	case 'l':
8008 	case KEY_LEFT:
8009 	case 'h':
8010 		horizontal_scroll_input(view, ch);
8011 		break;
8012 	case 'i':
8013 		s->show_ids = !s->show_ids;
8014 		view->count = 0;
8015 		break;
8016 	case 'L':
8017 		view->count = 0;
8018 		if (!s->selected_entry)
8019 			break;
8020 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8021 		break;
8022 	case 'R':
8023 		view->count = 0;
8024 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8025 		break;
8026 	case 'g':
8027 	case '=':
8028 	case KEY_HOME:
8029 		s->selected = 0;
8030 		view->count = 0;
8031 		if (s->tree == s->root)
8032 			s->first_displayed_entry =
8033 			    got_object_tree_get_first_entry(s->tree);
8034 		else
8035 			s->first_displayed_entry = NULL;
8036 		break;
8037 	case 'G':
8038 	case '*':
8039 	case KEY_END: {
8040 		int eos = view->nlines - 3;
8041 
8042 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8043 			--eos;  /* border */
8044 		s->selected = 0;
8045 		view->count = 0;
8046 		te = got_object_tree_get_last_entry(s->tree);
8047 		for (n = 0; n < eos; n++) {
8048 			if (te == NULL) {
8049 				if (s->tree != s->root) {
8050 					s->first_displayed_entry = NULL;
8051 					n++;
8052 				}
8053 				break;
8054 			}
8055 			s->first_displayed_entry = te;
8056 			te = got_tree_entry_get_prev(s->tree, te);
8057 		}
8058 		if (n > 0)
8059 			s->selected = n - 1;
8060 		break;
8061 	}
8062 	case 'k':
8063 	case KEY_UP:
8064 	case CTRL('p'):
8065 		if (s->selected > 0) {
8066 			s->selected--;
8067 			break;
8068 		}
8069 		tree_scroll_up(s, 1);
8070 		if (s->selected_entry == NULL ||
8071 		    (s->tree == s->root && s->selected_entry ==
8072 		     got_object_tree_get_first_entry(s->tree)))
8073 			view->count = 0;
8074 		break;
8075 	case CTRL('u'):
8076 	case 'u':
8077 		nscroll /= 2;
8078 		/* FALL THROUGH */
8079 	case KEY_PPAGE:
8080 	case CTRL('b'):
8081 	case 'b':
8082 		if (s->tree == s->root) {
8083 			if (got_object_tree_get_first_entry(s->tree) ==
8084 			    s->first_displayed_entry)
8085 				s->selected -= MIN(s->selected, nscroll);
8086 		} else {
8087 			if (s->first_displayed_entry == NULL)
8088 				s->selected -= MIN(s->selected, nscroll);
8089 		}
8090 		tree_scroll_up(s, MAX(0, nscroll));
8091 		if (s->selected_entry == NULL ||
8092 		    (s->tree == s->root && s->selected_entry ==
8093 		     got_object_tree_get_first_entry(s->tree)))
8094 			view->count = 0;
8095 		break;
8096 	case 'j':
8097 	case KEY_DOWN:
8098 	case CTRL('n'):
8099 		if (s->selected < s->ndisplayed - 1) {
8100 			s->selected++;
8101 			break;
8102 		}
8103 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8104 		    == NULL) {
8105 			/* can't scroll any further */
8106 			view->count = 0;
8107 			break;
8108 		}
8109 		tree_scroll_down(view, 1);
8110 		break;
8111 	case CTRL('d'):
8112 	case 'd':
8113 		nscroll /= 2;
8114 		/* FALL THROUGH */
8115 	case KEY_NPAGE:
8116 	case CTRL('f'):
8117 	case 'f':
8118 	case ' ':
8119 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8120 		    == NULL) {
8121 			/* can't scroll any further; move cursor down */
8122 			if (s->selected < s->ndisplayed - 1)
8123 				s->selected += MIN(nscroll,
8124 				    s->ndisplayed - s->selected - 1);
8125 			else
8126 				view->count = 0;
8127 			break;
8128 		}
8129 		tree_scroll_down(view, nscroll);
8130 		break;
8131 	case KEY_ENTER:
8132 	case '\r':
8133 	case KEY_BACKSPACE:
8134 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8135 			struct tog_parent_tree *parent;
8136 			/* user selected '..' */
8137 			if (s->tree == s->root) {
8138 				view->count = 0;
8139 				break;
8140 			}
8141 			parent = TAILQ_FIRST(&s->parents);
8142 			TAILQ_REMOVE(&s->parents, parent,
8143 			    entry);
8144 			got_object_tree_close(s->tree);
8145 			s->tree = parent->tree;
8146 			s->first_displayed_entry =
8147 			    parent->first_displayed_entry;
8148 			s->selected_entry =
8149 			    parent->selected_entry;
8150 			s->selected = parent->selected;
8151 			if (s->selected > view->nlines - 3) {
8152 				err = offset_selection_down(view);
8153 				if (err)
8154 					break;
8155 			}
8156 			free(parent);
8157 		} else if (S_ISDIR(got_tree_entry_get_mode(
8158 		    s->selected_entry))) {
8159 			struct got_tree_object *subtree;
8160 			view->count = 0;
8161 			err = got_object_open_as_tree(&subtree, s->repo,
8162 			    got_tree_entry_get_id(s->selected_entry));
8163 			if (err)
8164 				break;
8165 			err = tree_view_visit_subtree(s, subtree);
8166 			if (err) {
8167 				got_object_tree_close(subtree);
8168 				break;
8169 			}
8170 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8171 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8172 		break;
8173 	case KEY_RESIZE:
8174 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8175 			s->selected = view->nlines - 4;
8176 		view->count = 0;
8177 		break;
8178 	default:
8179 		view->count = 0;
8180 		break;
8181 	}
8182 
8183 	return err;
8184 }
8185 
8186 __dead static void
8187 usage_tree(void)
8188 {
8189 	endwin();
8190 	fprintf(stderr,
8191 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8192 	    getprogname());
8193 	exit(1);
8194 }
8195 
8196 static const struct got_error *
8197 cmd_tree(int argc, char *argv[])
8198 {
8199 	const struct got_error *error;
8200 	struct got_repository *repo = NULL;
8201 	struct got_worktree *worktree = NULL;
8202 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8203 	struct got_object_id *commit_id = NULL;
8204 	struct got_commit_object *commit = NULL;
8205 	const char *commit_id_arg = NULL;
8206 	char *keyword_idstr = NULL, *label = NULL;
8207 	struct got_reference *ref = NULL;
8208 	const char *head_ref_name = NULL;
8209 	int ch;
8210 	struct tog_view *view;
8211 	int *pack_fds = NULL;
8212 
8213 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8214 		switch (ch) {
8215 		case 'c':
8216 			commit_id_arg = optarg;
8217 			break;
8218 		case 'r':
8219 			repo_path = realpath(optarg, NULL);
8220 			if (repo_path == NULL)
8221 				return got_error_from_errno2("realpath",
8222 				    optarg);
8223 			break;
8224 		default:
8225 			usage_tree();
8226 			/* NOTREACHED */
8227 		}
8228 	}
8229 
8230 	argc -= optind;
8231 	argv += optind;
8232 
8233 	if (argc > 1)
8234 		usage_tree();
8235 
8236 	error = got_repo_pack_fds_open(&pack_fds);
8237 	if (error != NULL)
8238 		goto done;
8239 
8240 	if (repo_path == NULL) {
8241 		cwd = getcwd(NULL, 0);
8242 		if (cwd == NULL)
8243 			return got_error_from_errno("getcwd");
8244 		error = got_worktree_open(&worktree, cwd, NULL);
8245 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8246 			goto done;
8247 		if (worktree)
8248 			repo_path =
8249 			    strdup(got_worktree_get_repo_path(worktree));
8250 		else
8251 			repo_path = strdup(cwd);
8252 		if (repo_path == NULL) {
8253 			error = got_error_from_errno("strdup");
8254 			goto done;
8255 		}
8256 	}
8257 
8258 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8259 	if (error != NULL)
8260 		goto done;
8261 
8262 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8263 	    repo, worktree);
8264 	if (error)
8265 		goto done;
8266 
8267 	init_curses();
8268 
8269 	error = apply_unveil(got_repo_get_path(repo), NULL);
8270 	if (error)
8271 		goto done;
8272 
8273 	error = tog_load_refs(repo, 0);
8274 	if (error)
8275 		goto done;
8276 
8277 	if (commit_id_arg == NULL) {
8278 		error = got_repo_match_object_id(&commit_id, &label,
8279 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8280 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8281 		if (error)
8282 			goto done;
8283 		head_ref_name = label;
8284 	} else {
8285 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8286 		    repo, worktree);
8287 		if (error != NULL)
8288 			goto done;
8289 		if (keyword_idstr != NULL)
8290 			commit_id_arg = keyword_idstr;
8291 
8292 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8293 		if (error == NULL)
8294 			head_ref_name = got_ref_get_name(ref);
8295 		else if (error->code != GOT_ERR_NOT_REF)
8296 			goto done;
8297 		error = got_repo_match_object_id(&commit_id, NULL,
8298 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8299 		if (error)
8300 			goto done;
8301 	}
8302 
8303 	error = got_object_open_as_commit(&commit, repo, commit_id);
8304 	if (error)
8305 		goto done;
8306 
8307 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8308 	if (view == NULL) {
8309 		error = got_error_from_errno("view_open");
8310 		goto done;
8311 	}
8312 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8313 	if (error)
8314 		goto done;
8315 	if (!got_path_is_root_dir(in_repo_path)) {
8316 		error = tree_view_walk_path(&view->state.tree, commit,
8317 		    in_repo_path);
8318 		if (error)
8319 			goto done;
8320 	}
8321 
8322 	if (worktree) {
8323 		error = set_tog_base_commit(repo, worktree);
8324 		if (error != NULL)
8325 			goto done;
8326 
8327 		/* Release work tree lock. */
8328 		got_worktree_close(worktree);
8329 		worktree = NULL;
8330 	}
8331 
8332 	error = view_loop(view);
8333 
8334 done:
8335 	free(tog_base_commit.id);
8336 	free(keyword_idstr);
8337 	free(repo_path);
8338 	free(cwd);
8339 	free(commit_id);
8340 	free(label);
8341 	if (ref)
8342 		got_ref_close(ref);
8343 	if (worktree != NULL)
8344 		got_worktree_close(worktree);
8345 	if (repo) {
8346 		const struct got_error *close_err = got_repo_close(repo);
8347 		if (error == NULL)
8348 			error = close_err;
8349 	}
8350 	if (pack_fds) {
8351 		const struct got_error *pack_err =
8352 		    got_repo_pack_fds_close(pack_fds);
8353 		if (error == NULL)
8354 			error = pack_err;
8355 	}
8356 	tog_free_refs();
8357 	return error;
8358 }
8359 
8360 static const struct got_error *
8361 ref_view_load_refs(struct tog_ref_view_state *s)
8362 {
8363 	struct got_reflist_entry *sre;
8364 	struct tog_reflist_entry *re;
8365 
8366 	s->nrefs = 0;
8367 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8368 		if (strncmp(got_ref_get_name(sre->ref),
8369 		    "refs/got/", 9) == 0 &&
8370 		    strncmp(got_ref_get_name(sre->ref),
8371 		    "refs/got/backup/", 16) != 0)
8372 			continue;
8373 
8374 		re = malloc(sizeof(*re));
8375 		if (re == NULL)
8376 			return got_error_from_errno("malloc");
8377 
8378 		re->ref = got_ref_dup(sre->ref);
8379 		if (re->ref == NULL)
8380 			return got_error_from_errno("got_ref_dup");
8381 		re->idx = s->nrefs++;
8382 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8383 	}
8384 
8385 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8386 	return NULL;
8387 }
8388 
8389 static void
8390 ref_view_free_refs(struct tog_ref_view_state *s)
8391 {
8392 	struct tog_reflist_entry *re;
8393 
8394 	while (!TAILQ_EMPTY(&s->refs)) {
8395 		re = TAILQ_FIRST(&s->refs);
8396 		TAILQ_REMOVE(&s->refs, re, entry);
8397 		got_ref_close(re->ref);
8398 		free(re);
8399 	}
8400 }
8401 
8402 static const struct got_error *
8403 open_ref_view(struct tog_view *view, struct got_repository *repo)
8404 {
8405 	const struct got_error *err = NULL;
8406 	struct tog_ref_view_state *s = &view->state.ref;
8407 
8408 	s->selected_entry = 0;
8409 	s->repo = repo;
8410 
8411 	TAILQ_INIT(&s->refs);
8412 	STAILQ_INIT(&s->colors);
8413 
8414 	err = ref_view_load_refs(s);
8415 	if (err)
8416 		goto done;
8417 
8418 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8419 		err = add_color(&s->colors, "^refs/heads/",
8420 		    TOG_COLOR_REFS_HEADS,
8421 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8422 		if (err)
8423 			goto done;
8424 
8425 		err = add_color(&s->colors, "^refs/tags/",
8426 		    TOG_COLOR_REFS_TAGS,
8427 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8428 		if (err)
8429 			goto done;
8430 
8431 		err = add_color(&s->colors, "^refs/remotes/",
8432 		    TOG_COLOR_REFS_REMOTES,
8433 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8434 		if (err)
8435 			goto done;
8436 
8437 		err = add_color(&s->colors, "^refs/got/backup/",
8438 		    TOG_COLOR_REFS_BACKUP,
8439 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8440 		if (err)
8441 			goto done;
8442 	}
8443 
8444 	view->show = show_ref_view;
8445 	view->input = input_ref_view;
8446 	view->close = close_ref_view;
8447 	view->search_start = search_start_ref_view;
8448 	view->search_next = search_next_ref_view;
8449 done:
8450 	if (err) {
8451 		if (view->close == NULL)
8452 			close_ref_view(view);
8453 		view_close(view);
8454 	}
8455 	return err;
8456 }
8457 
8458 static const struct got_error *
8459 close_ref_view(struct tog_view *view)
8460 {
8461 	struct tog_ref_view_state *s = &view->state.ref;
8462 
8463 	ref_view_free_refs(s);
8464 	free_colors(&s->colors);
8465 
8466 	return NULL;
8467 }
8468 
8469 static const struct got_error *
8470 resolve_reflist_entry(struct got_object_id **commit_id,
8471     struct tog_reflist_entry *re, struct got_repository *repo)
8472 {
8473 	const struct got_error *err = NULL;
8474 	struct got_object_id *obj_id;
8475 	struct got_tag_object *tag = NULL;
8476 	int obj_type;
8477 
8478 	*commit_id = NULL;
8479 
8480 	err = got_ref_resolve(&obj_id, repo, re->ref);
8481 	if (err)
8482 		return err;
8483 
8484 	err = got_object_get_type(&obj_type, repo, obj_id);
8485 	if (err)
8486 		goto done;
8487 
8488 	switch (obj_type) {
8489 	case GOT_OBJ_TYPE_COMMIT:
8490 		*commit_id = obj_id;
8491 		break;
8492 	case GOT_OBJ_TYPE_TAG:
8493 		err = got_object_open_as_tag(&tag, repo, obj_id);
8494 		if (err)
8495 			goto done;
8496 		free(obj_id);
8497 		err = got_object_get_type(&obj_type, repo,
8498 		    got_object_tag_get_object_id(tag));
8499 		if (err)
8500 			goto done;
8501 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8502 			err = got_error(GOT_ERR_OBJ_TYPE);
8503 			goto done;
8504 		}
8505 		*commit_id = got_object_id_dup(
8506 		    got_object_tag_get_object_id(tag));
8507 		if (*commit_id == NULL) {
8508 			err = got_error_from_errno("got_object_id_dup");
8509 			goto done;
8510 		}
8511 		break;
8512 	default:
8513 		err = got_error(GOT_ERR_OBJ_TYPE);
8514 		break;
8515 	}
8516 
8517 done:
8518 	if (tag)
8519 		got_object_tag_close(tag);
8520 	if (err) {
8521 		free(*commit_id);
8522 		*commit_id = NULL;
8523 	}
8524 	return err;
8525 }
8526 
8527 static const struct got_error *
8528 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8529     struct tog_reflist_entry *re, struct got_repository *repo)
8530 {
8531 	struct tog_view *log_view;
8532 	const struct got_error *err = NULL;
8533 	struct got_object_id *commit_id = NULL;
8534 
8535 	*new_view = NULL;
8536 
8537 	err = resolve_reflist_entry(&commit_id, re, repo);
8538 	if (err) {
8539 		if (err->code != GOT_ERR_OBJ_TYPE)
8540 			return err;
8541 		else
8542 			return NULL;
8543 	}
8544 
8545 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8546 	if (log_view == NULL) {
8547 		err = got_error_from_errno("view_open");
8548 		goto done;
8549 	}
8550 
8551 	err = open_log_view(log_view, commit_id, repo,
8552 	    got_ref_get_name(re->ref), "", 0, NULL);
8553 done:
8554 	if (err)
8555 		view_close(log_view);
8556 	else
8557 		*new_view = log_view;
8558 	free(commit_id);
8559 	return err;
8560 }
8561 
8562 static void
8563 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8564 {
8565 	struct tog_reflist_entry *re;
8566 	int i = 0;
8567 
8568 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8569 		return;
8570 
8571 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8572 	while (i++ < maxscroll) {
8573 		if (re == NULL)
8574 			break;
8575 		s->first_displayed_entry = re;
8576 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8577 	}
8578 }
8579 
8580 static const struct got_error *
8581 ref_scroll_down(struct tog_view *view, int maxscroll)
8582 {
8583 	struct tog_ref_view_state *s = &view->state.ref;
8584 	struct tog_reflist_entry *next, *last;
8585 	int n = 0;
8586 
8587 	if (s->first_displayed_entry)
8588 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8589 	else
8590 		next = TAILQ_FIRST(&s->refs);
8591 
8592 	last = s->last_displayed_entry;
8593 	while (next && n++ < maxscroll) {
8594 		if (last) {
8595 			s->last_displayed_entry = last;
8596 			last = TAILQ_NEXT(last, entry);
8597 		}
8598 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8599 			s->first_displayed_entry = next;
8600 			next = TAILQ_NEXT(next, entry);
8601 		}
8602 	}
8603 
8604 	return NULL;
8605 }
8606 
8607 static const struct got_error *
8608 search_start_ref_view(struct tog_view *view)
8609 {
8610 	struct tog_ref_view_state *s = &view->state.ref;
8611 
8612 	s->matched_entry = NULL;
8613 	return NULL;
8614 }
8615 
8616 static int
8617 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8618 {
8619 	regmatch_t regmatch;
8620 
8621 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8622 	    0) == 0;
8623 }
8624 
8625 static const struct got_error *
8626 search_next_ref_view(struct tog_view *view)
8627 {
8628 	struct tog_ref_view_state *s = &view->state.ref;
8629 	struct tog_reflist_entry *re = NULL;
8630 
8631 	if (!view->searching) {
8632 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8633 		return NULL;
8634 	}
8635 
8636 	if (s->matched_entry) {
8637 		if (view->searching == TOG_SEARCH_FORWARD) {
8638 			if (s->selected_entry)
8639 				re = TAILQ_NEXT(s->selected_entry, entry);
8640 			else
8641 				re = TAILQ_PREV(s->selected_entry,
8642 				    tog_reflist_head, entry);
8643 		} else {
8644 			if (s->selected_entry == NULL)
8645 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8646 			else
8647 				re = TAILQ_PREV(s->selected_entry,
8648 				    tog_reflist_head, entry);
8649 		}
8650 	} else {
8651 		if (s->selected_entry)
8652 			re = s->selected_entry;
8653 		else if (view->searching == TOG_SEARCH_FORWARD)
8654 			re = TAILQ_FIRST(&s->refs);
8655 		else
8656 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8657 	}
8658 
8659 	while (1) {
8660 		if (re == NULL) {
8661 			if (s->matched_entry == NULL) {
8662 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8663 				return NULL;
8664 			}
8665 			if (view->searching == TOG_SEARCH_FORWARD)
8666 				re = TAILQ_FIRST(&s->refs);
8667 			else
8668 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8669 		}
8670 
8671 		if (match_reflist_entry(re, &view->regex)) {
8672 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8673 			s->matched_entry = re;
8674 			break;
8675 		}
8676 
8677 		if (view->searching == TOG_SEARCH_FORWARD)
8678 			re = TAILQ_NEXT(re, entry);
8679 		else
8680 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8681 	}
8682 
8683 	if (s->matched_entry) {
8684 		s->first_displayed_entry = s->matched_entry;
8685 		s->selected = 0;
8686 	}
8687 
8688 	return NULL;
8689 }
8690 
8691 static const struct got_error *
8692 show_ref_view(struct tog_view *view)
8693 {
8694 	const struct got_error *err = NULL;
8695 	struct tog_ref_view_state *s = &view->state.ref;
8696 	struct tog_reflist_entry *re;
8697 	char *line = NULL;
8698 	wchar_t *wline;
8699 	struct tog_color *tc;
8700 	int width, n, scrollx;
8701 	int limit = view->nlines;
8702 
8703 	werase(view->window);
8704 
8705 	s->ndisplayed = 0;
8706 	if (view_is_hsplit_top(view))
8707 		--limit;  /* border */
8708 
8709 	if (limit == 0)
8710 		return NULL;
8711 
8712 	re = s->first_displayed_entry;
8713 
8714 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8715 	    s->nrefs) == -1)
8716 		return got_error_from_errno("asprintf");
8717 
8718 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8719 	if (err) {
8720 		free(line);
8721 		return err;
8722 	}
8723 	if (view_needs_focus_indication(view))
8724 		wstandout(view->window);
8725 	waddwstr(view->window, wline);
8726 	while (width++ < view->ncols)
8727 		waddch(view->window, ' ');
8728 	if (view_needs_focus_indication(view))
8729 		wstandend(view->window);
8730 	free(wline);
8731 	wline = NULL;
8732 	free(line);
8733 	line = NULL;
8734 	if (--limit <= 0)
8735 		return NULL;
8736 
8737 	n = 0;
8738 	view->maxx = 0;
8739 	while (re && limit > 0) {
8740 		char *line = NULL;
8741 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8742 
8743 		if (s->show_date) {
8744 			struct got_commit_object *ci;
8745 			struct got_tag_object *tag;
8746 			struct got_object_id *id;
8747 			struct tm tm;
8748 			time_t t;
8749 
8750 			err = got_ref_resolve(&id, s->repo, re->ref);
8751 			if (err)
8752 				return err;
8753 			err = got_object_open_as_tag(&tag, s->repo, id);
8754 			if (err) {
8755 				if (err->code != GOT_ERR_OBJ_TYPE) {
8756 					free(id);
8757 					return err;
8758 				}
8759 				err = got_object_open_as_commit(&ci, s->repo,
8760 				    id);
8761 				if (err) {
8762 					free(id);
8763 					return err;
8764 				}
8765 				t = got_object_commit_get_committer_time(ci);
8766 				got_object_commit_close(ci);
8767 			} else {
8768 				t = got_object_tag_get_tagger_time(tag);
8769 				got_object_tag_close(tag);
8770 			}
8771 			free(id);
8772 			if (gmtime_r(&t, &tm) == NULL)
8773 				return got_error_from_errno("gmtime_r");
8774 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8775 				return got_error(GOT_ERR_NO_SPACE);
8776 		}
8777 		if (got_ref_is_symbolic(re->ref)) {
8778 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8779 			    ymd : "", got_ref_get_name(re->ref),
8780 			    got_ref_get_symref_target(re->ref)) == -1)
8781 				return got_error_from_errno("asprintf");
8782 		} else if (s->show_ids) {
8783 			struct got_object_id *id;
8784 			char *id_str;
8785 			err = got_ref_resolve(&id, s->repo, re->ref);
8786 			if (err)
8787 				return err;
8788 			err = got_object_id_str(&id_str, id);
8789 			if (err) {
8790 				free(id);
8791 				return err;
8792 			}
8793 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8794 			    got_ref_get_name(re->ref), id_str) == -1) {
8795 				err = got_error_from_errno("asprintf");
8796 				free(id);
8797 				free(id_str);
8798 				return err;
8799 			}
8800 			free(id);
8801 			free(id_str);
8802 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8803 		    got_ref_get_name(re->ref)) == -1)
8804 			return got_error_from_errno("asprintf");
8805 
8806 		/* use full line width to determine view->maxx */
8807 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8808 		if (err) {
8809 			free(line);
8810 			return err;
8811 		}
8812 		view->maxx = MAX(view->maxx, width);
8813 		free(wline);
8814 		wline = NULL;
8815 
8816 		err = format_line(&wline, &width, &scrollx, line, view->x,
8817 		    view->ncols, 0, 0);
8818 		if (err) {
8819 			free(line);
8820 			return err;
8821 		}
8822 		if (n == s->selected) {
8823 			if (view->focussed)
8824 				wstandout(view->window);
8825 			s->selected_entry = re;
8826 		}
8827 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8828 		if (tc)
8829 			wattr_on(view->window,
8830 			    COLOR_PAIR(tc->colorpair), NULL);
8831 		waddwstr(view->window, &wline[scrollx]);
8832 		if (tc)
8833 			wattr_off(view->window,
8834 			    COLOR_PAIR(tc->colorpair), NULL);
8835 		if (width < view->ncols)
8836 			waddch(view->window, '\n');
8837 		if (n == s->selected && view->focussed)
8838 			wstandend(view->window);
8839 		free(line);
8840 		free(wline);
8841 		wline = NULL;
8842 		n++;
8843 		s->ndisplayed++;
8844 		s->last_displayed_entry = re;
8845 
8846 		limit--;
8847 		re = TAILQ_NEXT(re, entry);
8848 	}
8849 
8850 	view_border(view);
8851 	return err;
8852 }
8853 
8854 static const struct got_error *
8855 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8856     struct tog_reflist_entry *re, struct got_repository *repo)
8857 {
8858 	const struct got_error *err = NULL;
8859 	struct got_object_id *commit_id = NULL;
8860 	struct tog_view *tree_view;
8861 
8862 	*new_view = NULL;
8863 
8864 	err = resolve_reflist_entry(&commit_id, re, repo);
8865 	if (err) {
8866 		if (err->code != GOT_ERR_OBJ_TYPE)
8867 			return err;
8868 		else
8869 			return NULL;
8870 	}
8871 
8872 
8873 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8874 	if (tree_view == NULL) {
8875 		err = got_error_from_errno("view_open");
8876 		goto done;
8877 	}
8878 
8879 	err = open_tree_view(tree_view, commit_id,
8880 	    got_ref_get_name(re->ref), repo);
8881 	if (err)
8882 		goto done;
8883 
8884 	*new_view = tree_view;
8885 done:
8886 	free(commit_id);
8887 	return err;
8888 }
8889 
8890 static const struct got_error *
8891 ref_goto_line(struct tog_view *view, int nlines)
8892 {
8893 	const struct got_error		*err = NULL;
8894 	struct tog_ref_view_state	*s = &view->state.ref;
8895 	int				 g, idx = s->selected_entry->idx;
8896 
8897 	g = view->gline;
8898 	view->gline = 0;
8899 
8900 	if (g == 0)
8901 		g = 1;
8902 	else if (g > s->nrefs)
8903 		g = s->nrefs;
8904 
8905 	if (g >= s->first_displayed_entry->idx + 1 &&
8906 	    g <= s->last_displayed_entry->idx + 1 &&
8907 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8908 		s->selected = g - s->first_displayed_entry->idx - 1;
8909 		return NULL;
8910 	}
8911 
8912 	if (idx + 1 < g) {
8913 		err = ref_scroll_down(view, g - idx - 1);
8914 		if (err)
8915 			return err;
8916 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8917 		    s->first_displayed_entry->idx + s->selected < g &&
8918 		    s->selected < s->ndisplayed - 1)
8919 			s->selected = g - s->first_displayed_entry->idx - 1;
8920 	} else if (idx + 1 > g)
8921 		ref_scroll_up(s, idx - g + 1);
8922 
8923 	if (g < nlines && s->first_displayed_entry->idx == 0)
8924 		s->selected = g - 1;
8925 
8926 	return NULL;
8927 
8928 }
8929 
8930 static const struct got_error *
8931 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8932 {
8933 	const struct got_error *err = NULL;
8934 	struct tog_ref_view_state *s = &view->state.ref;
8935 	struct tog_reflist_entry *re;
8936 	int n, nscroll = view->nlines - 1;
8937 
8938 	if (view->gline)
8939 		return ref_goto_line(view, nscroll);
8940 
8941 	switch (ch) {
8942 	case '0':
8943 	case '$':
8944 	case KEY_RIGHT:
8945 	case 'l':
8946 	case KEY_LEFT:
8947 	case 'h':
8948 		horizontal_scroll_input(view, ch);
8949 		break;
8950 	case 'i':
8951 		s->show_ids = !s->show_ids;
8952 		view->count = 0;
8953 		break;
8954 	case 'm':
8955 		s->show_date = !s->show_date;
8956 		view->count = 0;
8957 		break;
8958 	case 'o':
8959 		s->sort_by_date = !s->sort_by_date;
8960 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8961 		view->count = 0;
8962 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8963 		    got_ref_cmp_by_commit_timestamp_descending :
8964 		    tog_ref_cmp_by_name, s->repo);
8965 		if (err)
8966 			break;
8967 		got_reflist_object_id_map_free(tog_refs_idmap);
8968 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8969 		    &tog_refs, s->repo);
8970 		if (err)
8971 			break;
8972 		ref_view_free_refs(s);
8973 		err = ref_view_load_refs(s);
8974 		break;
8975 	case KEY_ENTER:
8976 	case '\r':
8977 		view->count = 0;
8978 		if (!s->selected_entry)
8979 			break;
8980 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8981 		break;
8982 	case 'T':
8983 		view->count = 0;
8984 		if (!s->selected_entry)
8985 			break;
8986 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8987 		break;
8988 	case 'g':
8989 	case '=':
8990 	case KEY_HOME:
8991 		s->selected = 0;
8992 		view->count = 0;
8993 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8994 		break;
8995 	case 'G':
8996 	case '*':
8997 	case KEY_END: {
8998 		int eos = view->nlines - 1;
8999 
9000 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
9001 			--eos;  /* border */
9002 		s->selected = 0;
9003 		view->count = 0;
9004 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
9005 		for (n = 0; n < eos; n++) {
9006 			if (re == NULL)
9007 				break;
9008 			s->first_displayed_entry = re;
9009 			re = TAILQ_PREV(re, tog_reflist_head, entry);
9010 		}
9011 		if (n > 0)
9012 			s->selected = n - 1;
9013 		break;
9014 	}
9015 	case 'k':
9016 	case KEY_UP:
9017 	case CTRL('p'):
9018 		if (s->selected > 0) {
9019 			s->selected--;
9020 			break;
9021 		}
9022 		ref_scroll_up(s, 1);
9023 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9024 			view->count = 0;
9025 		break;
9026 	case CTRL('u'):
9027 	case 'u':
9028 		nscroll /= 2;
9029 		/* FALL THROUGH */
9030 	case KEY_PPAGE:
9031 	case CTRL('b'):
9032 	case 'b':
9033 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9034 			s->selected -= MIN(nscroll, s->selected);
9035 		ref_scroll_up(s, MAX(0, nscroll));
9036 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9037 			view->count = 0;
9038 		break;
9039 	case 'j':
9040 	case KEY_DOWN:
9041 	case CTRL('n'):
9042 		if (s->selected < s->ndisplayed - 1) {
9043 			s->selected++;
9044 			break;
9045 		}
9046 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9047 			/* can't scroll any further */
9048 			view->count = 0;
9049 			break;
9050 		}
9051 		ref_scroll_down(view, 1);
9052 		break;
9053 	case CTRL('d'):
9054 	case 'd':
9055 		nscroll /= 2;
9056 		/* FALL THROUGH */
9057 	case KEY_NPAGE:
9058 	case CTRL('f'):
9059 	case 'f':
9060 	case ' ':
9061 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9062 			/* can't scroll any further; move cursor down */
9063 			if (s->selected < s->ndisplayed - 1)
9064 				s->selected += MIN(nscroll,
9065 				    s->ndisplayed - s->selected - 1);
9066 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9067 				s->selected += s->ndisplayed - s->selected - 1;
9068 			view->count = 0;
9069 			break;
9070 		}
9071 		ref_scroll_down(view, nscroll);
9072 		break;
9073 	case CTRL('l'):
9074 		view->count = 0;
9075 		tog_free_refs();
9076 		err = tog_load_refs(s->repo, s->sort_by_date);
9077 		if (err)
9078 			break;
9079 		ref_view_free_refs(s);
9080 		err = ref_view_load_refs(s);
9081 		break;
9082 	case KEY_RESIZE:
9083 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9084 			s->selected = view->nlines - 2;
9085 		break;
9086 	default:
9087 		view->count = 0;
9088 		break;
9089 	}
9090 
9091 	return err;
9092 }
9093 
9094 __dead static void
9095 usage_ref(void)
9096 {
9097 	endwin();
9098 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9099 	    getprogname());
9100 	exit(1);
9101 }
9102 
9103 static const struct got_error *
9104 cmd_ref(int argc, char *argv[])
9105 {
9106 	const struct got_error *error;
9107 	struct got_repository *repo = NULL;
9108 	struct got_worktree *worktree = NULL;
9109 	char *cwd = NULL, *repo_path = NULL;
9110 	int ch;
9111 	struct tog_view *view;
9112 	int *pack_fds = NULL;
9113 
9114 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9115 		switch (ch) {
9116 		case 'r':
9117 			repo_path = realpath(optarg, NULL);
9118 			if (repo_path == NULL)
9119 				return got_error_from_errno2("realpath",
9120 				    optarg);
9121 			break;
9122 		default:
9123 			usage_ref();
9124 			/* NOTREACHED */
9125 		}
9126 	}
9127 
9128 	argc -= optind;
9129 	argv += optind;
9130 
9131 	if (argc > 1)
9132 		usage_ref();
9133 
9134 	error = got_repo_pack_fds_open(&pack_fds);
9135 	if (error != NULL)
9136 		goto done;
9137 
9138 	if (repo_path == NULL) {
9139 		cwd = getcwd(NULL, 0);
9140 		if (cwd == NULL)
9141 			return got_error_from_errno("getcwd");
9142 		error = got_worktree_open(&worktree, cwd, NULL);
9143 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9144 			goto done;
9145 		if (worktree)
9146 			repo_path =
9147 			    strdup(got_worktree_get_repo_path(worktree));
9148 		else
9149 			repo_path = strdup(cwd);
9150 		if (repo_path == NULL) {
9151 			error = got_error_from_errno("strdup");
9152 			goto done;
9153 		}
9154 	}
9155 
9156 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9157 	if (error != NULL)
9158 		goto done;
9159 
9160 	init_curses();
9161 
9162 	error = apply_unveil(got_repo_get_path(repo), NULL);
9163 	if (error)
9164 		goto done;
9165 
9166 	error = tog_load_refs(repo, 0);
9167 	if (error)
9168 		goto done;
9169 
9170 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9171 	if (view == NULL) {
9172 		error = got_error_from_errno("view_open");
9173 		goto done;
9174 	}
9175 
9176 	error = open_ref_view(view, repo);
9177 	if (error)
9178 		goto done;
9179 
9180 	if (worktree) {
9181 		error = set_tog_base_commit(repo, worktree);
9182 		if (error != NULL)
9183 			goto done;
9184 
9185 		/* Release work tree lock. */
9186 		got_worktree_close(worktree);
9187 		worktree = NULL;
9188 	}
9189 
9190 	error = view_loop(view);
9191 
9192 done:
9193 	free(tog_base_commit.id);
9194 	free(repo_path);
9195 	free(cwd);
9196 	if (worktree != NULL)
9197 		got_worktree_close(worktree);
9198 	if (repo) {
9199 		const struct got_error *close_err = got_repo_close(repo);
9200 		if (close_err)
9201 			error = close_err;
9202 	}
9203 	if (pack_fds) {
9204 		const struct got_error *pack_err =
9205 		    got_repo_pack_fds_close(pack_fds);
9206 		if (error == NULL)
9207 			error = pack_err;
9208 	}
9209 	tog_free_refs();
9210 	return error;
9211 }
9212 
9213 static const struct got_error*
9214 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9215     const char *str)
9216 {
9217 	size_t len;
9218 
9219 	if (win == NULL)
9220 		win = stdscr;
9221 
9222 	len = strlen(str);
9223 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9224 
9225 	if (focus)
9226 		wstandout(win);
9227 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9228 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9229 	if (focus)
9230 		wstandend(win);
9231 
9232 	return NULL;
9233 }
9234 
9235 static const struct got_error *
9236 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9237 {
9238 	off_t *p;
9239 
9240 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9241 	if (p == NULL) {
9242 		free(*line_offsets);
9243 		*line_offsets = NULL;
9244 		return got_error_from_errno("reallocarray");
9245 	}
9246 
9247 	*line_offsets = p;
9248 	(*line_offsets)[*nlines] = off;
9249 	++(*nlines);
9250 	return NULL;
9251 }
9252 
9253 static const struct got_error *
9254 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9255 {
9256 	*ret = 0;
9257 
9258 	for (;n > 0; --n, ++km) {
9259 		char	*t0, *t, *k;
9260 		size_t	 len = 1;
9261 
9262 		if (km->keys == NULL)
9263 			continue;
9264 
9265 		t = t0 = strdup(km->keys);
9266 		if (t0 == NULL)
9267 			return got_error_from_errno("strdup");
9268 
9269 		len += strlen(t);
9270 		while ((k = strsep(&t, " ")) != NULL)
9271 			len += strlen(k) > 1 ? 2 : 0;
9272 		free(t0);
9273 		*ret = MAX(*ret, len);
9274 	}
9275 
9276 	return NULL;
9277 }
9278 
9279 /*
9280  * Write keymap section headers, keys, and key info in km to f.
9281  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9282  * wrap control and symbolic keys in guillemets, else use <>.
9283  */
9284 static const struct got_error *
9285 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9286 {
9287 	int n, len = width;
9288 
9289 	if (km->keys) {
9290 		static const char *u8_glyph[] = {
9291 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9292 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9293 		};
9294 		char	*t0, *t, *k;
9295 		int	 cs, s, first = 1;
9296 
9297 		cs = got_locale_is_utf8();
9298 
9299 		t = t0 = strdup(km->keys);
9300 		if (t0 == NULL)
9301 			return got_error_from_errno("strdup");
9302 
9303 		len = strlen(km->keys);
9304 		while ((k = strsep(&t, " ")) != NULL) {
9305 			s = strlen(k) > 1;  /* control or symbolic key */
9306 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9307 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9308 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9309 			if (n < 0) {
9310 				free(t0);
9311 				return got_error_from_errno("fprintf");
9312 			}
9313 			first = 0;
9314 			len += s ? 2 : 0;
9315 			*off += n;
9316 		}
9317 		free(t0);
9318 	}
9319 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9320 	if (n < 0)
9321 		return got_error_from_errno("fprintf");
9322 	*off += n;
9323 
9324 	return NULL;
9325 }
9326 
9327 static const struct got_error *
9328 format_help(struct tog_help_view_state *s)
9329 {
9330 	const struct got_error		*err = NULL;
9331 	off_t				 off = 0;
9332 	int				 i, max, n, show = s->all;
9333 	static const struct tog_key_map	 km[] = {
9334 #define KEYMAP_(info, type)	{ NULL, (info), type }
9335 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9336 		GENERATE_HELP
9337 #undef KEYMAP_
9338 #undef KEY_
9339 	};
9340 
9341 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9342 	if (err)
9343 		return err;
9344 
9345 	n = nitems(km);
9346 	err = max_key_str(&max, km, n);
9347 	if (err)
9348 		return err;
9349 
9350 	for (i = 0; i < n; ++i) {
9351 		if (km[i].keys == NULL) {
9352 			show = s->all;
9353 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9354 			    km[i].type == s->type || s->all)
9355 				show = 1;
9356 		}
9357 		if (show) {
9358 			err = format_help_line(&off, s->f, &km[i], max);
9359 			if (err)
9360 				return err;
9361 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9362 			if (err)
9363 				return err;
9364 		}
9365 	}
9366 	fputc('\n', s->f);
9367 	++off;
9368 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9369 	return err;
9370 }
9371 
9372 static const struct got_error *
9373 create_help(struct tog_help_view_state *s)
9374 {
9375 	FILE			*f;
9376 	const struct got_error	*err;
9377 
9378 	free(s->line_offsets);
9379 	s->line_offsets = NULL;
9380 	s->nlines = 0;
9381 
9382 	f = got_opentemp();
9383 	if (f == NULL)
9384 		return got_error_from_errno("got_opentemp");
9385 	s->f = f;
9386 
9387 	err = format_help(s);
9388 	if (err)
9389 		return err;
9390 
9391 	if (s->f && fflush(s->f) != 0)
9392 		return got_error_from_errno("fflush");
9393 
9394 	return NULL;
9395 }
9396 
9397 static const struct got_error *
9398 search_start_help_view(struct tog_view *view)
9399 {
9400 	view->state.help.matched_line = 0;
9401 	return NULL;
9402 }
9403 
9404 static void
9405 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9406     size_t *nlines, int **first, int **last, int **match, int **selected)
9407 {
9408 	struct tog_help_view_state *s = &view->state.help;
9409 
9410 	*f = s->f;
9411 	*nlines = s->nlines;
9412 	*line_offsets = s->line_offsets;
9413 	*match = &s->matched_line;
9414 	*first = &s->first_displayed_line;
9415 	*last = &s->last_displayed_line;
9416 	*selected = &s->selected_line;
9417 }
9418 
9419 static const struct got_error *
9420 show_help_view(struct tog_view *view)
9421 {
9422 	struct tog_help_view_state	*s = &view->state.help;
9423 	const struct got_error		*err;
9424 	regmatch_t			*regmatch = &view->regmatch;
9425 	wchar_t				*wline;
9426 	char				*line;
9427 	ssize_t				 linelen;
9428 	size_t				 linesz = 0;
9429 	int				 width, nprinted = 0, rc = 0;
9430 	int				 eos = view->nlines;
9431 
9432 	if (view_is_hsplit_top(view))
9433 		--eos;  /* account for border */
9434 
9435 	s->lineno = 0;
9436 	rewind(s->f);
9437 	werase(view->window);
9438 
9439 	if (view->gline > s->nlines - 1)
9440 		view->gline = s->nlines - 1;
9441 
9442 	err = win_draw_center(view->window, 0, 0, view->ncols,
9443 	    view_needs_focus_indication(view),
9444 	    "tog help (press q to return to tog)");
9445 	if (err)
9446 		return err;
9447 	if (eos <= 1)
9448 		return NULL;
9449 	waddstr(view->window, "\n\n");
9450 	eos -= 2;
9451 
9452 	s->eof = 0;
9453 	view->maxx = 0;
9454 	line = NULL;
9455 	while (eos > 0 && nprinted < eos) {
9456 		attr_t attr = 0;
9457 
9458 		linelen = getline(&line, &linesz, s->f);
9459 		if (linelen == -1) {
9460 			if (!feof(s->f)) {
9461 				free(line);
9462 				return got_ferror(s->f, GOT_ERR_IO);
9463 			}
9464 			s->eof = 1;
9465 			break;
9466 		}
9467 		if (++s->lineno < s->first_displayed_line)
9468 			continue;
9469 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9470 			continue;
9471 		if (s->lineno == view->hiline)
9472 			attr = A_STANDOUT;
9473 
9474 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9475 		    view->x ? 1 : 0);
9476 		if (err) {
9477 			free(line);
9478 			return err;
9479 		}
9480 		view->maxx = MAX(view->maxx, width);
9481 		free(wline);
9482 		wline = NULL;
9483 
9484 		if (attr)
9485 			wattron(view->window, attr);
9486 		if (s->first_displayed_line + nprinted == s->matched_line &&
9487 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9488 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9489 			    view->window, view->x, regmatch);
9490 			if (err) {
9491 				free(line);
9492 				return err;
9493 			}
9494 		} else {
9495 			int skip;
9496 
9497 			err = format_line(&wline, &width, &skip, line,
9498 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9499 			if (err) {
9500 				free(line);
9501 				return err;
9502 			}
9503 			waddwstr(view->window, &wline[skip]);
9504 			free(wline);
9505 			wline = NULL;
9506 		}
9507 		if (s->lineno == view->hiline) {
9508 			while (width++ < view->ncols)
9509 				waddch(view->window, ' ');
9510 		} else {
9511 			if (width < view->ncols)
9512 				waddch(view->window, '\n');
9513 		}
9514 		if (attr)
9515 			wattroff(view->window, attr);
9516 		if (++nprinted == 1)
9517 			s->first_displayed_line = s->lineno;
9518 	}
9519 	free(line);
9520 	if (nprinted > 0)
9521 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9522 	else
9523 		s->last_displayed_line = s->first_displayed_line;
9524 
9525 	view_border(view);
9526 
9527 	if (s->eof) {
9528 		rc = waddnstr(view->window,
9529 		    "See the tog(1) manual page for full documentation",
9530 		    view->ncols - 1);
9531 		if (rc == ERR)
9532 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9533 	} else {
9534 		wmove(view->window, view->nlines - 1, 0);
9535 		wclrtoeol(view->window);
9536 		wstandout(view->window);
9537 		rc = waddnstr(view->window, "scroll down for more...",
9538 		    view->ncols - 1);
9539 		if (rc == ERR)
9540 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9541 		if (getcurx(view->window) < view->ncols - 6) {
9542 			rc = wprintw(view->window, "[%.0f%%]",
9543 			    100.00 * s->last_displayed_line / s->nlines);
9544 			if (rc == ERR)
9545 				return got_error_msg(GOT_ERR_IO, "wprintw");
9546 		}
9547 		wstandend(view->window);
9548 	}
9549 
9550 	return NULL;
9551 }
9552 
9553 static const struct got_error *
9554 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9555 {
9556 	struct tog_help_view_state	*s = &view->state.help;
9557 	const struct got_error		*err = NULL;
9558 	char				*line = NULL;
9559 	ssize_t				 linelen;
9560 	size_t				 linesz = 0;
9561 	int				 eos, nscroll;
9562 
9563 	eos = nscroll = view->nlines;
9564 	if (view_is_hsplit_top(view))
9565 		--eos;  /* border */
9566 
9567 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9568 
9569 	switch (ch) {
9570 	case '0':
9571 	case '$':
9572 	case KEY_RIGHT:
9573 	case 'l':
9574 	case KEY_LEFT:
9575 	case 'h':
9576 		horizontal_scroll_input(view, ch);
9577 		break;
9578 	case 'g':
9579 	case KEY_HOME:
9580 		s->first_displayed_line = 1;
9581 		view->count = 0;
9582 		break;
9583 	case 'G':
9584 	case KEY_END:
9585 		view->count = 0;
9586 		if (s->eof)
9587 			break;
9588 		s->first_displayed_line = (s->nlines - eos) + 3;
9589 		s->eof = 1;
9590 		break;
9591 	case 'k':
9592 	case KEY_UP:
9593 		if (s->first_displayed_line > 1)
9594 			--s->first_displayed_line;
9595 		else
9596 			view->count = 0;
9597 		break;
9598 	case CTRL('u'):
9599 	case 'u':
9600 		nscroll /= 2;
9601 		/* FALL THROUGH */
9602 	case KEY_PPAGE:
9603 	case CTRL('b'):
9604 	case 'b':
9605 		if (s->first_displayed_line == 1) {
9606 			view->count = 0;
9607 			break;
9608 		}
9609 		while (--nscroll > 0 && s->first_displayed_line > 1)
9610 			s->first_displayed_line--;
9611 		break;
9612 	case 'j':
9613 	case KEY_DOWN:
9614 	case CTRL('n'):
9615 		if (!s->eof)
9616 			++s->first_displayed_line;
9617 		else
9618 			view->count = 0;
9619 		break;
9620 	case CTRL('d'):
9621 	case 'd':
9622 		nscroll /= 2;
9623 		/* FALL THROUGH */
9624 	case KEY_NPAGE:
9625 	case CTRL('f'):
9626 	case 'f':
9627 	case ' ':
9628 		if (s->eof) {
9629 			view->count = 0;
9630 			break;
9631 		}
9632 		while (!s->eof && --nscroll > 0) {
9633 			linelen = getline(&line, &linesz, s->f);
9634 			s->first_displayed_line++;
9635 			if (linelen == -1) {
9636 				if (feof(s->f))
9637 					s->eof = 1;
9638 				else
9639 					err = got_ferror(s->f, GOT_ERR_IO);
9640 				break;
9641 			}
9642 		}
9643 		free(line);
9644 		break;
9645 	default:
9646 		view->count = 0;
9647 		break;
9648 	}
9649 
9650 	return err;
9651 }
9652 
9653 static const struct got_error *
9654 close_help_view(struct tog_view *view)
9655 {
9656 	struct tog_help_view_state *s = &view->state.help;
9657 
9658 	free(s->line_offsets);
9659 	s->line_offsets = NULL;
9660 	if (fclose(s->f) == EOF)
9661 		return got_error_from_errno("fclose");
9662 
9663 	return NULL;
9664 }
9665 
9666 static const struct got_error *
9667 reset_help_view(struct tog_view *view)
9668 {
9669 	struct tog_help_view_state *s = &view->state.help;
9670 
9671 
9672 	if (s->f && fclose(s->f) == EOF)
9673 		return got_error_from_errno("fclose");
9674 
9675 	wclear(view->window);
9676 	view->count = 0;
9677 	view->x = 0;
9678 	s->all = !s->all;
9679 	s->first_displayed_line = 1;
9680 	s->last_displayed_line = view->nlines;
9681 	s->matched_line = 0;
9682 
9683 	return create_help(s);
9684 }
9685 
9686 static const struct got_error *
9687 open_help_view(struct tog_view *view, struct tog_view *parent)
9688 {
9689 	const struct got_error		*err = NULL;
9690 	struct tog_help_view_state	*s = &view->state.help;
9691 
9692 	s->type = (enum tog_keymap_type)parent->type;
9693 	s->first_displayed_line = 1;
9694 	s->last_displayed_line = view->nlines;
9695 	s->selected_line = 1;
9696 
9697 	view->show = show_help_view;
9698 	view->input = input_help_view;
9699 	view->reset = reset_help_view;
9700 	view->close = close_help_view;
9701 	view->search_start = search_start_help_view;
9702 	view->search_setup = search_setup_help_view;
9703 	view->search_next = search_next_view_match;
9704 
9705 	err = create_help(s);
9706 	return err;
9707 }
9708 
9709 static const struct got_error *
9710 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9711     enum tog_view_type request, int y, int x)
9712 {
9713 	const struct got_error *err = NULL;
9714 
9715 	*new_view = NULL;
9716 
9717 	switch (request) {
9718 	case TOG_VIEW_DIFF:
9719 		if (view->type == TOG_VIEW_LOG) {
9720 			struct tog_log_view_state *s = &view->state.log;
9721 
9722 			err = open_diff_view_for_commit(new_view, y, x,
9723 			    s->selected_entry->commit, s->selected_entry->id,
9724 			    view, s->repo);
9725 		} else
9726 			return got_error_msg(GOT_ERR_NOT_IMPL,
9727 			    "parent/child view pair not supported");
9728 		break;
9729 	case TOG_VIEW_BLAME:
9730 		if (view->type == TOG_VIEW_TREE) {
9731 			struct tog_tree_view_state *s = &view->state.tree;
9732 
9733 			err = blame_tree_entry(new_view, y, x,
9734 			    s->selected_entry, &s->parents, s->commit_id,
9735 			    s->repo);
9736 		} else
9737 			return got_error_msg(GOT_ERR_NOT_IMPL,
9738 			    "parent/child view pair not supported");
9739 		break;
9740 	case TOG_VIEW_LOG:
9741 		if (view->type == TOG_VIEW_BLAME)
9742 			err = log_annotated_line(new_view, y, x,
9743 			    view->state.blame.repo, view->state.blame.id_to_log);
9744 		else if (view->type == TOG_VIEW_TREE)
9745 			err = log_selected_tree_entry(new_view, y, x,
9746 			    &view->state.tree);
9747 		else if (view->type == TOG_VIEW_REF)
9748 			err = log_ref_entry(new_view, y, x,
9749 			    view->state.ref.selected_entry,
9750 			    view->state.ref.repo);
9751 		else
9752 			return got_error_msg(GOT_ERR_NOT_IMPL,
9753 			    "parent/child view pair not supported");
9754 		break;
9755 	case TOG_VIEW_TREE:
9756 		if (view->type == TOG_VIEW_LOG)
9757 			err = browse_commit_tree(new_view, y, x,
9758 			    view->state.log.selected_entry,
9759 			    view->state.log.in_repo_path,
9760 			    view->state.log.head_ref_name,
9761 			    view->state.log.repo);
9762 		else if (view->type == TOG_VIEW_REF)
9763 			err = browse_ref_tree(new_view, y, x,
9764 			    view->state.ref.selected_entry,
9765 			    view->state.ref.repo);
9766 		else
9767 			return got_error_msg(GOT_ERR_NOT_IMPL,
9768 			    "parent/child view pair not supported");
9769 		break;
9770 	case TOG_VIEW_REF:
9771 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9772 		if (*new_view == NULL)
9773 			return got_error_from_errno("view_open");
9774 		if (view->type == TOG_VIEW_LOG)
9775 			err = open_ref_view(*new_view, view->state.log.repo);
9776 		else if (view->type == TOG_VIEW_TREE)
9777 			err = open_ref_view(*new_view, view->state.tree.repo);
9778 		else
9779 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9780 			    "parent/child view pair not supported");
9781 		if (err)
9782 			view_close(*new_view);
9783 		break;
9784 	case TOG_VIEW_HELP:
9785 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9786 		if (*new_view == NULL)
9787 			return got_error_from_errno("view_open");
9788 		err = open_help_view(*new_view, view);
9789 		if (err)
9790 			view_close(*new_view);
9791 		break;
9792 	default:
9793 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9794 	}
9795 
9796 	return err;
9797 }
9798 
9799 /*
9800  * If view was scrolled down to move the selected line into view when opening a
9801  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9802  */
9803 static void
9804 offset_selection_up(struct tog_view *view)
9805 {
9806 	switch (view->type) {
9807 	case TOG_VIEW_BLAME: {
9808 		struct tog_blame_view_state *s = &view->state.blame;
9809 		if (s->first_displayed_line == 1) {
9810 			s->selected_line = MAX(s->selected_line - view->offset,
9811 			    1);
9812 			break;
9813 		}
9814 		if (s->first_displayed_line > view->offset)
9815 			s->first_displayed_line -= view->offset;
9816 		else
9817 			s->first_displayed_line = 1;
9818 		s->selected_line += view->offset;
9819 		break;
9820 	}
9821 	case TOG_VIEW_LOG:
9822 		log_scroll_up(&view->state.log, view->offset);
9823 		view->state.log.selected += view->offset;
9824 		break;
9825 	case TOG_VIEW_REF:
9826 		ref_scroll_up(&view->state.ref, view->offset);
9827 		view->state.ref.selected += view->offset;
9828 		break;
9829 	case TOG_VIEW_TREE:
9830 		tree_scroll_up(&view->state.tree, view->offset);
9831 		view->state.tree.selected += view->offset;
9832 		break;
9833 	default:
9834 		break;
9835 	}
9836 
9837 	view->offset = 0;
9838 }
9839 
9840 /*
9841  * If the selected line is in the section of screen covered by the bottom split,
9842  * scroll down offset lines to move it into view and index its new position.
9843  */
9844 static const struct got_error *
9845 offset_selection_down(struct tog_view *view)
9846 {
9847 	const struct got_error	*err = NULL;
9848 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9849 	int			*selected = NULL;
9850 	int			 header, offset;
9851 
9852 	switch (view->type) {
9853 	case TOG_VIEW_BLAME: {
9854 		struct tog_blame_view_state *s = &view->state.blame;
9855 		header = 3;
9856 		scrolld = NULL;
9857 		if (s->selected_line > view->nlines - header) {
9858 			offset = abs(view->nlines - s->selected_line - header);
9859 			s->first_displayed_line += offset;
9860 			s->selected_line -= offset;
9861 			view->offset = offset;
9862 		}
9863 		break;
9864 	}
9865 	case TOG_VIEW_LOG: {
9866 		struct tog_log_view_state *s = &view->state.log;
9867 		scrolld = &log_scroll_down;
9868 		header = view_is_parent_view(view) ? 3 : 2;
9869 		selected = &s->selected;
9870 		break;
9871 	}
9872 	case TOG_VIEW_REF: {
9873 		struct tog_ref_view_state *s = &view->state.ref;
9874 		scrolld = &ref_scroll_down;
9875 		header = 3;
9876 		selected = &s->selected;
9877 		break;
9878 	}
9879 	case TOG_VIEW_TREE: {
9880 		struct tog_tree_view_state *s = &view->state.tree;
9881 		scrolld = &tree_scroll_down;
9882 		header = 5;
9883 		selected = &s->selected;
9884 		break;
9885 	}
9886 	default:
9887 		selected = NULL;
9888 		scrolld = NULL;
9889 		header = 0;
9890 		break;
9891 	}
9892 
9893 	if (selected && *selected > view->nlines - header) {
9894 		offset = abs(view->nlines - *selected - header);
9895 		view->offset = offset;
9896 		if (scrolld && offset) {
9897 			err = scrolld(view, offset);
9898 			*selected -= offset;
9899 		}
9900 	}
9901 
9902 	return err;
9903 }
9904 
9905 static void
9906 list_commands(FILE *fp)
9907 {
9908 	size_t i;
9909 
9910 	fprintf(fp, "commands:");
9911 	for (i = 0; i < nitems(tog_commands); i++) {
9912 		const struct tog_cmd *cmd = &tog_commands[i];
9913 		fprintf(fp, " %s", cmd->name);
9914 	}
9915 	fputc('\n', fp);
9916 }
9917 
9918 __dead static void
9919 usage(int hflag, int status)
9920 {
9921 	FILE *fp = (status == 0) ? stdout : stderr;
9922 
9923 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9924 	    getprogname());
9925 	if (hflag) {
9926 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9927 		list_commands(fp);
9928 	}
9929 	exit(status);
9930 }
9931 
9932 static char **
9933 make_argv(int argc, ...)
9934 {
9935 	va_list ap;
9936 	char **argv;
9937 	int i;
9938 
9939 	va_start(ap, argc);
9940 
9941 	argv = calloc(argc, sizeof(char *));
9942 	if (argv == NULL)
9943 		err(1, "calloc");
9944 	for (i = 0; i < argc; i++) {
9945 		argv[i] = strdup(va_arg(ap, char *));
9946 		if (argv[i] == NULL)
9947 			err(1, "strdup");
9948 	}
9949 
9950 	va_end(ap);
9951 	return argv;
9952 }
9953 
9954 /*
9955  * Try to convert 'tog path' into a 'tog log path' command.
9956  * The user could simply have mistyped the command rather than knowingly
9957  * provided a path. So check whether argv[0] can in fact be resolved
9958  * to a path in the HEAD commit and print a special error if not.
9959  * This hack is for mpi@ <3
9960  */
9961 static const struct got_error *
9962 tog_log_with_path(int argc, char *argv[])
9963 {
9964 	const struct got_error *error = NULL, *close_err;
9965 	const struct tog_cmd *cmd = NULL;
9966 	struct got_repository *repo = NULL;
9967 	struct got_worktree *worktree = NULL;
9968 	struct got_object_id *commit_id = NULL, *id = NULL;
9969 	struct got_commit_object *commit = NULL;
9970 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9971 	char *commit_id_str = NULL, **cmd_argv = NULL;
9972 	int *pack_fds = NULL;
9973 
9974 	cwd = getcwd(NULL, 0);
9975 	if (cwd == NULL)
9976 		return got_error_from_errno("getcwd");
9977 
9978 	error = got_repo_pack_fds_open(&pack_fds);
9979 	if (error != NULL)
9980 		goto done;
9981 
9982 	error = got_worktree_open(&worktree, cwd, NULL);
9983 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9984 		goto done;
9985 
9986 	if (worktree)
9987 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9988 	else
9989 		repo_path = strdup(cwd);
9990 	if (repo_path == NULL) {
9991 		error = got_error_from_errno("strdup");
9992 		goto done;
9993 	}
9994 
9995 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9996 	if (error != NULL)
9997 		goto done;
9998 
9999 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
10000 	    repo, worktree);
10001 	if (error)
10002 		goto done;
10003 
10004 	error = tog_load_refs(repo, 0);
10005 	if (error)
10006 		goto done;
10007 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
10008 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
10009 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
10010 	if (error)
10011 		goto done;
10012 
10013 	if (worktree) {
10014 		got_worktree_close(worktree);
10015 		worktree = NULL;
10016 	}
10017 
10018 	error = got_object_open_as_commit(&commit, repo, commit_id);
10019 	if (error)
10020 		goto done;
10021 
10022 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10023 	if (error) {
10024 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10025 			goto done;
10026 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10027 		    getprogname(), argv[0]);
10028 		usage(1, 1);
10029 		/* not reached */
10030 	}
10031 
10032 	error = got_object_id_str(&commit_id_str, commit_id);
10033 	if (error)
10034 		goto done;
10035 
10036 	cmd = &tog_commands[0]; /* log */
10037 	argc = 4;
10038 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10039 	error = cmd->cmd_main(argc, cmd_argv);
10040 done:
10041 	if (repo) {
10042 		close_err = got_repo_close(repo);
10043 		if (error == NULL)
10044 			error = close_err;
10045 	}
10046 	if (commit)
10047 		got_object_commit_close(commit);
10048 	if (worktree)
10049 		got_worktree_close(worktree);
10050 	if (pack_fds) {
10051 		const struct got_error *pack_err =
10052 		    got_repo_pack_fds_close(pack_fds);
10053 		if (error == NULL)
10054 			error = pack_err;
10055 	}
10056 	free(id);
10057 	free(commit_id_str);
10058 	free(commit_id);
10059 	free(cwd);
10060 	free(repo_path);
10061 	free(in_repo_path);
10062 	if (cmd_argv) {
10063 		int i;
10064 		for (i = 0; i < argc; i++)
10065 			free(cmd_argv[i]);
10066 		free(cmd_argv);
10067 	}
10068 	tog_free_refs();
10069 	return error;
10070 }
10071 
10072 int
10073 main(int argc, char *argv[])
10074 {
10075 	const struct got_error *io_err, *error = NULL;
10076 	const struct tog_cmd *cmd = NULL;
10077 	int ch, hflag = 0, Vflag = 0;
10078 	char **cmd_argv = NULL;
10079 	static const struct option longopts[] = {
10080 	    { "version", no_argument, NULL, 'V' },
10081 	    { NULL, 0, NULL, 0}
10082 	};
10083 	char *diff_algo_str = NULL;
10084 	const char *test_script_path;
10085 
10086 	setlocale(LC_CTYPE, "");
10087 
10088 	/*
10089 	 * Test mode init must happen before pledge() because "tty" will
10090 	 * not allow TTY-related ioctls to occur via regular files.
10091 	 */
10092 	test_script_path = getenv("TOG_TEST_SCRIPT");
10093 	if (test_script_path != NULL) {
10094 		error = init_mock_term(test_script_path);
10095 		if (error) {
10096 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10097 			return 1;
10098 		}
10099 	} else if (!isatty(STDIN_FILENO))
10100 		errx(1, "standard input is not a tty");
10101 
10102 #if !defined(PROFILE)
10103 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10104 	    NULL) == -1)
10105 		err(1, "pledge");
10106 #endif
10107 
10108 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10109 		switch (ch) {
10110 		case 'h':
10111 			hflag = 1;
10112 			break;
10113 		case 'V':
10114 			Vflag = 1;
10115 			break;
10116 		default:
10117 			usage(hflag, 1);
10118 			/* NOTREACHED */
10119 		}
10120 	}
10121 
10122 	argc -= optind;
10123 	argv += optind;
10124 	optind = 1;
10125 	optreset = 1;
10126 
10127 	if (Vflag) {
10128 		got_version_print_str();
10129 		return 0;
10130 	}
10131 
10132 	if (argc == 0) {
10133 		if (hflag)
10134 			usage(hflag, 0);
10135 		/* Build an argument vector which runs a default command. */
10136 		cmd = &tog_commands[0];
10137 		argc = 1;
10138 		cmd_argv = make_argv(argc, cmd->name);
10139 	} else {
10140 		size_t i;
10141 
10142 		/* Did the user specify a command? */
10143 		for (i = 0; i < nitems(tog_commands); i++) {
10144 			if (strncmp(tog_commands[i].name, argv[0],
10145 			    strlen(argv[0])) == 0) {
10146 				cmd = &tog_commands[i];
10147 				break;
10148 			}
10149 		}
10150 	}
10151 
10152 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10153 	if (diff_algo_str) {
10154 		if (strcasecmp(diff_algo_str, "patience") == 0)
10155 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10156 		if (strcasecmp(diff_algo_str, "myers") == 0)
10157 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10158 	}
10159 
10160 	tog_base_commit.idx = -1;
10161 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10162 
10163 	if (cmd == NULL) {
10164 		if (argc != 1)
10165 			usage(0, 1);
10166 		/* No command specified; try log with a path */
10167 		error = tog_log_with_path(argc, argv);
10168 	} else {
10169 		if (hflag)
10170 			cmd->cmd_usage();
10171 		else
10172 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10173 	}
10174 
10175 	if (using_mock_io) {
10176 		io_err = tog_io_close();
10177 		if (error == NULL)
10178 			error = io_err;
10179 	}
10180 	endwin();
10181 	if (cmd_argv) {
10182 		int i;
10183 		for (i = 0; i < argc; i++)
10184 			free(cmd_argv[i]);
10185 		free(cmd_argv);
10186 	}
10187 
10188 	if (error && error->code != GOT_ERR_CANCELLED &&
10189 	    error->code != GOT_ERR_EOF &&
10190 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10191 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10192 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10193 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10194 		return 1;
10195 	}
10196 	return 0;
10197 }