1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 #include "got_keyword.h"
62 
63 #ifndef MIN
64 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
65 #endif
66 
67 #ifndef MAX
68 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
69 #endif
70 
71 #ifndef CTRL
72 #define CTRL(x)		((x) & 0x1f)
73 #endif
74 
75 #ifndef nitems
76 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
77 #endif
78 
79 struct tog_cmd {
80 	const char *name;
81 	const struct got_error *(*cmd_main)(int, char *[]);
82 	void (*cmd_usage)(void);
83 };
84 
85 __dead static void	usage(int, int);
86 __dead static void	usage_log(void);
87 __dead static void	usage_diff(void);
88 __dead static void	usage_blame(void);
89 __dead static void	usage_tree(void);
90 __dead static void	usage_ref(void);
91 
92 static const struct got_error*	cmd_log(int, char *[]);
93 static const struct got_error*	cmd_diff(int, char *[]);
94 static const struct got_error*	cmd_blame(int, char *[]);
95 static const struct got_error*	cmd_tree(int, char *[]);
96 static const struct got_error*	cmd_ref(int, char *[]);
97 
98 static const struct tog_cmd tog_commands[] = {
99 	{ "log",	cmd_log,	usage_log },
100 	{ "diff",	cmd_diff,	usage_diff },
101 	{ "blame",	cmd_blame,	usage_blame },
102 	{ "tree",	cmd_tree,	usage_tree },
103 	{ "ref",	cmd_ref,	usage_ref },
104 };
105 
106 enum tog_view_type {
107 	TOG_VIEW_DIFF,
108 	TOG_VIEW_LOG,
109 	TOG_VIEW_BLAME,
110 	TOG_VIEW_TREE,
111 	TOG_VIEW_REF,
112 	TOG_VIEW_HELP
113 };
114 
115 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
116 enum tog_keymap_type {
117 	TOG_KEYMAP_KEYS = -2,
118 	TOG_KEYMAP_GLOBAL,
119 	TOG_KEYMAP_DIFF,
120 	TOG_KEYMAP_LOG,
121 	TOG_KEYMAP_BLAME,
122 	TOG_KEYMAP_TREE,
123 	TOG_KEYMAP_REF,
124 	TOG_KEYMAP_HELP
125 };
126 
127 enum tog_view_mode {
128 	TOG_VIEW_SPLIT_NONE,
129 	TOG_VIEW_SPLIT_VERT,
130 	TOG_VIEW_SPLIT_HRZN
131 };
132 
133 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
134 
135 #define TOG_EOF_STRING	"(END)"
136 
137 struct commit_queue_entry {
138 	TAILQ_ENTRY(commit_queue_entry) entry;
139 	struct got_object_id *id;
140 	struct got_commit_object *commit;
141 	int idx;
142 };
143 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
144 struct commit_queue {
145 	int ncommits;
146 	struct commit_queue_head head;
147 };
148 
149 struct tog_color {
150 	STAILQ_ENTRY(tog_color) entry;
151 	regex_t regex;
152 	short colorpair;
153 };
154 STAILQ_HEAD(tog_colors, tog_color);
155 
156 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
157 static struct got_reflist_object_id_map *tog_refs_idmap;
158 static struct {
159 	struct got_object_id	*id;
160 	int			 idx;
161 	char			 marker;
162 } tog_base_commit;
163 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
164 
165 static const struct got_error *
166 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
167     struct got_reference* re2)
168 {
169 	const char *name1 = got_ref_get_name(re1);
170 	const char *name2 = got_ref_get_name(re2);
171 	int isbackup1, isbackup2;
172 
173 	/* Sort backup refs towards the bottom of the list. */
174 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
175 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
176 	if (!isbackup1 && isbackup2) {
177 		*cmp = -1;
178 		return NULL;
179 	} else if (isbackup1 && !isbackup2) {
180 		*cmp = 1;
181 		return NULL;
182 	}
183 
184 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
185 	return NULL;
186 }
187 
188 static const struct got_error *
189 tog_load_refs(struct got_repository *repo, int sort_by_date)
190 {
191 	const struct got_error *err;
192 
193 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
194 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
195 	    repo);
196 	if (err)
197 		return err;
198 
199 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
200 	    repo);
201 }
202 
203 static void
204 tog_free_refs(void)
205 {
206 	if (tog_refs_idmap) {
207 		got_reflist_object_id_map_free(tog_refs_idmap);
208 		tog_refs_idmap = NULL;
209 	}
210 	got_ref_list_free(&tog_refs);
211 }
212 
213 static const struct got_error *
214 add_color(struct tog_colors *colors, const char *pattern,
215     int idx, short color)
216 {
217 	const struct got_error *err = NULL;
218 	struct tog_color *tc;
219 	int regerr = 0;
220 
221 	if (idx < 1 || idx > COLOR_PAIRS - 1)
222 		return NULL;
223 
224 	init_pair(idx, color, -1);
225 
226 	tc = calloc(1, sizeof(*tc));
227 	if (tc == NULL)
228 		return got_error_from_errno("calloc");
229 	regerr = regcomp(&tc->regex, pattern,
230 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
231 	if (regerr) {
232 		static char regerr_msg[512];
233 		static char err_msg[512];
234 		regerror(regerr, &tc->regex, regerr_msg,
235 		    sizeof(regerr_msg));
236 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
237 		    regerr_msg);
238 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
239 		free(tc);
240 		return err;
241 	}
242 	tc->colorpair = idx;
243 	STAILQ_INSERT_HEAD(colors, tc, entry);
244 	return NULL;
245 }
246 
247 static void
248 free_colors(struct tog_colors *colors)
249 {
250 	struct tog_color *tc;
251 
252 	while (!STAILQ_EMPTY(colors)) {
253 		tc = STAILQ_FIRST(colors);
254 		STAILQ_REMOVE_HEAD(colors, entry);
255 		regfree(&tc->regex);
256 		free(tc);
257 	}
258 }
259 
260 static struct tog_color *
261 get_color(struct tog_colors *colors, int colorpair)
262 {
263 	struct tog_color *tc = NULL;
264 
265 	STAILQ_FOREACH(tc, colors, entry) {
266 		if (tc->colorpair == colorpair)
267 			return tc;
268 	}
269 
270 	return NULL;
271 }
272 
273 static int
274 default_color_value(const char *envvar)
275 {
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
279 		return COLOR_CYAN;
280 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
281 		return COLOR_YELLOW;
282 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
283 		return COLOR_GREEN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
285 		return COLOR_MAGENTA;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
287 		return COLOR_MAGENTA;
288 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
291 		return COLOR_GREEN;
292 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
295 		return COLOR_CYAN;
296 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
299 		return COLOR_GREEN;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
301 		return COLOR_MAGENTA;
302 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
303 		return COLOR_YELLOW;
304 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
305 		return COLOR_CYAN;
306 
307 	return -1;
308 }
309 
310 static int
311 get_color_value(const char *envvar)
312 {
313 	const char *val = getenv(envvar);
314 
315 	if (val == NULL)
316 		return default_color_value(envvar);
317 
318 	if (strcasecmp(val, "black") == 0)
319 		return COLOR_BLACK;
320 	if (strcasecmp(val, "red") == 0)
321 		return COLOR_RED;
322 	if (strcasecmp(val, "green") == 0)
323 		return COLOR_GREEN;
324 	if (strcasecmp(val, "yellow") == 0)
325 		return COLOR_YELLOW;
326 	if (strcasecmp(val, "blue") == 0)
327 		return COLOR_BLUE;
328 	if (strcasecmp(val, "magenta") == 0)
329 		return COLOR_MAGENTA;
330 	if (strcasecmp(val, "cyan") == 0)
331 		return COLOR_CYAN;
332 	if (strcasecmp(val, "white") == 0)
333 		return COLOR_WHITE;
334 	if (strcasecmp(val, "default") == 0)
335 		return -1;
336 
337 	return default_color_value(envvar);
338 }
339 
340 struct tog_diff_view_state {
341 	struct got_object_id *id1, *id2;
342 	const char *label1, *label2;
343 	FILE *f, *f1, *f2;
344 	int fd1, fd2;
345 	int lineno;
346 	int first_displayed_line;
347 	int last_displayed_line;
348 	int eof;
349 	int diff_context;
350 	int ignore_whitespace;
351 	int force_text_diff;
352 	struct got_repository *repo;
353 	struct got_diff_line *lines;
354 	size_t nlines;
355 	int matched_line;
356 	int selected_line;
357 
358 	/* passed from log or blame view; may be NULL */
359 	struct tog_view *parent_view;
360 };
361 
362 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
363 static volatile sig_atomic_t tog_thread_error;
364 
365 struct tog_log_thread_args {
366 	pthread_cond_t need_commits;
367 	pthread_cond_t commit_loaded;
368 	int commits_needed;
369 	int load_all;
370 	struct got_commit_graph *graph;
371 	struct commit_queue *real_commits;
372 	const char *in_repo_path;
373 	struct got_object_id *start_id;
374 	struct got_repository *repo;
375 	int *pack_fds;
376 	int log_complete;
377 	pthread_cond_t log_loaded;
378 	sig_atomic_t *quit;
379 	struct commit_queue_entry **first_displayed_entry;
380 	struct commit_queue_entry **selected_entry;
381 	int *searching;
382 	int *search_next_done;
383 	regex_t *regex;
384 	int *limiting;
385 	int limit_match;
386 	regex_t *limit_regex;
387 	struct commit_queue *limit_commits;
388 	struct got_worktree *worktree;
389 	int need_commit_marker;
390 };
391 
392 struct tog_log_view_state {
393 	struct commit_queue *commits;
394 	struct commit_queue_entry *first_displayed_entry;
395 	struct commit_queue_entry *last_displayed_entry;
396 	struct commit_queue_entry *selected_entry;
397 	struct commit_queue real_commits;
398 	int selected;
399 	char *in_repo_path;
400 	char *head_ref_name;
401 	int log_branches;
402 	struct got_repository *repo;
403 	struct got_object_id *start_id;
404 	sig_atomic_t quit;
405 	pthread_t thread;
406 	struct tog_log_thread_args thread_args;
407 	struct commit_queue_entry *matched_entry;
408 	struct commit_queue_entry *search_entry;
409 	struct tog_colors colors;
410 	int use_committer;
411 	int limit_view;
412 	regex_t limit_regex;
413 	struct commit_queue limit_commits;
414 };
415 
416 #define TOG_COLOR_DIFF_MINUS		1
417 #define TOG_COLOR_DIFF_PLUS		2
418 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
419 #define TOG_COLOR_DIFF_META		4
420 #define TOG_COLOR_TREE_SUBMODULE	5
421 #define TOG_COLOR_TREE_SYMLINK		6
422 #define TOG_COLOR_TREE_DIRECTORY	7
423 #define TOG_COLOR_TREE_EXECUTABLE	8
424 #define TOG_COLOR_COMMIT		9
425 #define TOG_COLOR_AUTHOR		10
426 #define TOG_COLOR_DATE			11
427 #define TOG_COLOR_REFS_HEADS		12
428 #define TOG_COLOR_REFS_TAGS		13
429 #define TOG_COLOR_REFS_REMOTES		14
430 #define TOG_COLOR_REFS_BACKUP		15
431 
432 struct tog_blame_cb_args {
433 	struct tog_blame_line *lines; /* one per line */
434 	int nlines;
435 
436 	struct tog_view *view;
437 	struct got_object_id *commit_id;
438 	int *quit;
439 };
440 
441 struct tog_blame_thread_args {
442 	const char *path;
443 	struct got_repository *repo;
444 	struct tog_blame_cb_args *cb_args;
445 	int *complete;
446 	got_cancel_cb cancel_cb;
447 	void *cancel_arg;
448 	pthread_cond_t blame_complete;
449 };
450 
451 struct tog_blame {
452 	FILE *f;
453 	off_t filesize;
454 	struct tog_blame_line *lines;
455 	int nlines;
456 	off_t *line_offsets;
457 	pthread_t thread;
458 	struct tog_blame_thread_args thread_args;
459 	struct tog_blame_cb_args cb_args;
460 	const char *path;
461 	int *pack_fds;
462 };
463 
464 struct tog_blame_view_state {
465 	int first_displayed_line;
466 	int last_displayed_line;
467 	int selected_line;
468 	int last_diffed_line;
469 	int blame_complete;
470 	int eof;
471 	int done;
472 	struct got_object_id_queue blamed_commits;
473 	struct got_object_qid *blamed_commit;
474 	char *path;
475 	struct got_repository *repo;
476 	struct got_object_id *commit_id;
477 	struct got_object_id *id_to_log;
478 	struct tog_blame blame;
479 	int matched_line;
480 	struct tog_colors colors;
481 };
482 
483 struct tog_parent_tree {
484 	TAILQ_ENTRY(tog_parent_tree) entry;
485 	struct got_tree_object *tree;
486 	struct got_tree_entry *first_displayed_entry;
487 	struct got_tree_entry *selected_entry;
488 	int selected;
489 };
490 
491 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
492 
493 struct tog_tree_view_state {
494 	char *tree_label;
495 	struct got_object_id *commit_id;/* commit which this tree belongs to */
496 	struct got_tree_object *root;	/* the commit's root tree entry */
497 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
498 	struct got_tree_entry *first_displayed_entry;
499 	struct got_tree_entry *last_displayed_entry;
500 	struct got_tree_entry *selected_entry;
501 	int ndisplayed, selected, show_ids;
502 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
503 	char *head_ref_name;
504 	struct got_repository *repo;
505 	struct got_tree_entry *matched_entry;
506 	struct tog_colors colors;
507 };
508 
509 struct tog_reflist_entry {
510 	TAILQ_ENTRY(tog_reflist_entry) entry;
511 	struct got_reference *ref;
512 	int idx;
513 };
514 
515 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
516 
517 struct tog_ref_view_state {
518 	struct tog_reflist_head refs;
519 	struct tog_reflist_entry *first_displayed_entry;
520 	struct tog_reflist_entry *last_displayed_entry;
521 	struct tog_reflist_entry *selected_entry;
522 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
523 	struct got_repository *repo;
524 	struct tog_reflist_entry *matched_entry;
525 	struct tog_colors colors;
526 };
527 
528 struct tog_help_view_state {
529 	FILE			*f;
530 	off_t			*line_offsets;
531 	size_t			 nlines;
532 	int			 lineno;
533 	int			 first_displayed_line;
534 	int			 last_displayed_line;
535 	int			 eof;
536 	int			 matched_line;
537 	int			 selected_line;
538 	int			 all;
539 	enum tog_keymap_type	 type;
540 };
541 
542 #define GENERATE_HELP \
543 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
544 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
545 	KEY_("k C-p Up", "Move cursor or page up one line"), \
546 	KEY_("j C-n Down", "Move cursor or page down one line"), \
547 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
548 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
549 	KEY_("C-u u", "Scroll the view up one half page"), \
550 	KEY_("C-d d", "Scroll the view down one half page"), \
551 	KEY_("g", "Go to line N (default: first line)"), \
552 	KEY_("Home =", "Go to the first line"), \
553 	KEY_("G", "Go to line N (default: last line)"), \
554 	KEY_("End *", "Go to the last line"), \
555 	KEY_("l Right", "Scroll the view right"), \
556 	KEY_("h Left", "Scroll the view left"), \
557 	KEY_("$", "Scroll view to the rightmost position"), \
558 	KEY_("0", "Scroll view to the leftmost position"), \
559 	KEY_("-", "Decrease size of the focussed split"), \
560 	KEY_("+", "Increase size of the focussed split"), \
561 	KEY_("Tab", "Switch focus between views"), \
562 	KEY_("F", "Toggle fullscreen mode"), \
563 	KEY_("S", "Switch split-screen layout"), \
564 	KEY_("/", "Open prompt to enter search term"), \
565 	KEY_("n", "Find next line/token matching the current search term"), \
566 	KEY_("N", "Find previous line/token matching the current search term"),\
567 	KEY_("q", "Quit the focussed view; Quit help screen"), \
568 	KEY_("Q", "Quit tog"), \
569 	\
570 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
571 	KEY_("< ,", "Move cursor up one commit"), \
572 	KEY_("> .", "Move cursor down one commit"), \
573 	KEY_("Enter", "Open diff view of the selected commit"), \
574 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
575 	KEY_("R", "Open ref view of all repository references"), \
576 	KEY_("T", "Display tree view of the repository from the selected" \
577 	    " commit"), \
578 	KEY_("@", "Toggle between displaying author and committer name"), \
579 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
580 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
581 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
582 	\
583 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
584 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
585 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
586 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
587 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
588 	    " data"), \
589 	KEY_("(", "Go to the previous file in the diff"), \
590 	KEY_(")", "Go to the next file in the diff"), \
591 	KEY_("{", "Go to the previous hunk in the diff"), \
592 	KEY_("}", "Go to the next hunk in the diff"), \
593 	KEY_("[", "Decrease the number of context lines"), \
594 	KEY_("]", "Increase the number of context lines"), \
595 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
596 	\
597 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
598 	KEY_("Enter", "Display diff view of the selected line's commit"), \
599 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
600 	KEY_("L", "Open log view for the currently selected annotated line"), \
601 	KEY_("C", "Reload view with the previously blamed commit"), \
602 	KEY_("c", "Reload view with the version of the file found in the" \
603 	    " selected line's commit"), \
604 	KEY_("p", "Reload view with the version of the file found in the" \
605 	    " selected line's parent commit"), \
606 	\
607 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
608 	KEY_("Enter", "Enter selected directory or open blame view of the" \
609 	    " selected file"), \
610 	KEY_("L", "Open log view for the selected entry"), \
611 	KEY_("R", "Open ref view of all repository references"), \
612 	KEY_("i", "Show object IDs for all tree entries"), \
613 	KEY_("Backspace", "Return to the parent directory"), \
614 	\
615 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
616 	KEY_("Enter", "Display log view of the selected reference"), \
617 	KEY_("T", "Display tree view of the selected reference"), \
618 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
619 	KEY_("m", "Toggle display of last modified date for each reference"), \
620 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
621 	KEY_("C-l", "Reload view with all repository references")
622 
623 struct tog_key_map {
624 	const char		*keys;
625 	const char		*info;
626 	enum tog_keymap_type	 type;
627 };
628 
629 /* curses io for tog regress */
630 struct tog_io {
631 	FILE	*cin;
632 	FILE	*cout;
633 	FILE	*f;
634 	FILE	*sdump;
635 	int	 wait_for_ui;
636 } tog_io;
637 static int using_mock_io;
638 
639 #define TOG_KEY_SCRDUMP	SHRT_MIN
640 
641 /*
642  * We implement two types of views: parent views and child views.
643  *
644  * The 'Tab' key switches focus between a parent view and its child view.
645  * Child views are shown side-by-side to their parent view, provided
646  * there is enough screen estate.
647  *
648  * When a new view is opened from within a parent view, this new view
649  * becomes a child view of the parent view, replacing any existing child.
650  *
651  * When a new view is opened from within a child view, this new view
652  * becomes a parent view which will obscure the views below until the
653  * user quits the new parent view by typing 'q'.
654  *
655  * This list of views contains parent views only.
656  * Child views are only pointed to by their parent view.
657  */
658 TAILQ_HEAD(tog_view_list_head, tog_view);
659 
660 struct tog_view {
661 	TAILQ_ENTRY(tog_view) entry;
662 	WINDOW *window;
663 	PANEL *panel;
664 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
665 	int resized_y, resized_x; /* begin_y/x based on user resizing */
666 	int maxx, x; /* max column and current start column */
667 	int lines, cols; /* copies of LINES and COLS */
668 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
669 	int gline, hiline; /* navigate to and highlight this nG line */
670 	int ch, count; /* current keymap and count prefix */
671 	int resized; /* set when in a resize event */
672 	int focussed; /* Only set on one parent or child view at a time. */
673 	int dying;
674 	struct tog_view *parent;
675 	struct tog_view *child;
676 
677 	/*
678 	 * This flag is initially set on parent views when a new child view
679 	 * is created. It gets toggled when the 'Tab' key switches focus
680 	 * between parent and child.
681 	 * The flag indicates whether focus should be passed on to our child
682 	 * view if this parent view gets picked for focus after another parent
683 	 * view was closed. This prevents child views from losing focus in such
684 	 * situations.
685 	 */
686 	int focus_child;
687 
688 	enum tog_view_mode mode;
689 	/* type-specific state */
690 	enum tog_view_type type;
691 	union {
692 		struct tog_diff_view_state diff;
693 		struct tog_log_view_state log;
694 		struct tog_blame_view_state blame;
695 		struct tog_tree_view_state tree;
696 		struct tog_ref_view_state ref;
697 		struct tog_help_view_state help;
698 	} state;
699 
700 	const struct got_error *(*show)(struct tog_view *);
701 	const struct got_error *(*input)(struct tog_view **,
702 	    struct tog_view *, int);
703 	const struct got_error *(*reset)(struct tog_view *);
704 	const struct got_error *(*resize)(struct tog_view *, int);
705 	const struct got_error *(*close)(struct tog_view *);
706 
707 	const struct got_error *(*search_start)(struct tog_view *);
708 	const struct got_error *(*search_next)(struct tog_view *);
709 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
710 	    int **, int **, int **, int **);
711 	int search_started;
712 	int searching;
713 #define TOG_SEARCH_FORWARD	1
714 #define TOG_SEARCH_BACKWARD	2
715 	int search_next_done;
716 #define TOG_SEARCH_HAVE_MORE	1
717 #define TOG_SEARCH_NO_MORE	2
718 #define TOG_SEARCH_HAVE_NONE	3
719 	regex_t regex;
720 	regmatch_t regmatch;
721 	const char *action;
722 };
723 
724 static const struct got_error *open_diff_view(struct tog_view *,
725     struct got_object_id *, struct got_object_id *,
726     const char *, const char *, int, int, int, struct tog_view *,
727     struct got_repository *);
728 static const struct got_error *show_diff_view(struct tog_view *);
729 static const struct got_error *input_diff_view(struct tog_view **,
730     struct tog_view *, int);
731 static const struct got_error *reset_diff_view(struct tog_view *);
732 static const struct got_error* close_diff_view(struct tog_view *);
733 static const struct got_error *search_start_diff_view(struct tog_view *);
734 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
735     size_t *, int **, int **, int **, int **);
736 static const struct got_error *search_next_view_match(struct tog_view *);
737 
738 static const struct got_error *open_log_view(struct tog_view *,
739     struct got_object_id *, struct got_repository *,
740     const char *, const char *, int, struct got_worktree *);
741 static const struct got_error * show_log_view(struct tog_view *);
742 static const struct got_error *input_log_view(struct tog_view **,
743     struct tog_view *, int);
744 static const struct got_error *resize_log_view(struct tog_view *, int);
745 static const struct got_error *close_log_view(struct tog_view *);
746 static const struct got_error *search_start_log_view(struct tog_view *);
747 static const struct got_error *search_next_log_view(struct tog_view *);
748 
749 static const struct got_error *open_blame_view(struct tog_view *, char *,
750     struct got_object_id *, struct got_repository *);
751 static const struct got_error *show_blame_view(struct tog_view *);
752 static const struct got_error *input_blame_view(struct tog_view **,
753     struct tog_view *, int);
754 static const struct got_error *reset_blame_view(struct tog_view *);
755 static const struct got_error *close_blame_view(struct tog_view *);
756 static const struct got_error *search_start_blame_view(struct tog_view *);
757 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
758     size_t *, int **, int **, int **, int **);
759 
760 static const struct got_error *open_tree_view(struct tog_view *,
761     struct got_object_id *, const char *, struct got_repository *);
762 static const struct got_error *show_tree_view(struct tog_view *);
763 static const struct got_error *input_tree_view(struct tog_view **,
764     struct tog_view *, int);
765 static const struct got_error *close_tree_view(struct tog_view *);
766 static const struct got_error *search_start_tree_view(struct tog_view *);
767 static const struct got_error *search_next_tree_view(struct tog_view *);
768 
769 static const struct got_error *open_ref_view(struct tog_view *,
770     struct got_repository *);
771 static const struct got_error *show_ref_view(struct tog_view *);
772 static const struct got_error *input_ref_view(struct tog_view **,
773     struct tog_view *, int);
774 static const struct got_error *close_ref_view(struct tog_view *);
775 static const struct got_error *search_start_ref_view(struct tog_view *);
776 static const struct got_error *search_next_ref_view(struct tog_view *);
777 
778 static const struct got_error *open_help_view(struct tog_view *,
779     struct tog_view *);
780 static const struct got_error *show_help_view(struct tog_view *);
781 static const struct got_error *input_help_view(struct tog_view **,
782     struct tog_view *, int);
783 static const struct got_error *reset_help_view(struct tog_view *);
784 static const struct got_error* close_help_view(struct tog_view *);
785 static const struct got_error *search_start_help_view(struct tog_view *);
786 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
787     size_t *, int **, int **, int **, int **);
788 
789 static volatile sig_atomic_t tog_sigwinch_received;
790 static volatile sig_atomic_t tog_sigpipe_received;
791 static volatile sig_atomic_t tog_sigcont_received;
792 static volatile sig_atomic_t tog_sigint_received;
793 static volatile sig_atomic_t tog_sigterm_received;
794 
795 static void
796 tog_sigwinch(int signo)
797 {
798 	tog_sigwinch_received = 1;
799 }
800 
801 static void
802 tog_sigpipe(int signo)
803 {
804 	tog_sigpipe_received = 1;
805 }
806 
807 static void
808 tog_sigcont(int signo)
809 {
810 	tog_sigcont_received = 1;
811 }
812 
813 static void
814 tog_sigint(int signo)
815 {
816 	tog_sigint_received = 1;
817 }
818 
819 static void
820 tog_sigterm(int signo)
821 {
822 	tog_sigterm_received = 1;
823 }
824 
825 static int
826 tog_fatal_signal_received(void)
827 {
828 	return (tog_sigpipe_received ||
829 	    tog_sigint_received || tog_sigterm_received);
830 }
831 
832 static const struct got_error *
833 view_close(struct tog_view *view)
834 {
835 	const struct got_error *err = NULL, *child_err = NULL;
836 
837 	if (view->child) {
838 		child_err = view_close(view->child);
839 		view->child = NULL;
840 	}
841 	if (view->close)
842 		err = view->close(view);
843 	if (view->panel)
844 		del_panel(view->panel);
845 	if (view->window)
846 		delwin(view->window);
847 	free(view);
848 	return err ? err : child_err;
849 }
850 
851 static struct tog_view *
852 view_open(int nlines, int ncols, int begin_y, int begin_x,
853     enum tog_view_type type)
854 {
855 	struct tog_view *view = calloc(1, sizeof(*view));
856 
857 	if (view == NULL)
858 		return NULL;
859 
860 	view->type = type;
861 	view->lines = LINES;
862 	view->cols = COLS;
863 	view->nlines = nlines ? nlines : LINES - begin_y;
864 	view->ncols = ncols ? ncols : COLS - begin_x;
865 	view->begin_y = begin_y;
866 	view->begin_x = begin_x;
867 	view->window = newwin(nlines, ncols, begin_y, begin_x);
868 	if (view->window == NULL) {
869 		view_close(view);
870 		return NULL;
871 	}
872 	view->panel = new_panel(view->window);
873 	if (view->panel == NULL ||
874 	    set_panel_userptr(view->panel, view) != OK) {
875 		view_close(view);
876 		return NULL;
877 	}
878 
879 	keypad(view->window, TRUE);
880 	return view;
881 }
882 
883 static int
884 view_split_begin_x(int begin_x)
885 {
886 	if (begin_x > 0 || COLS < 120)
887 		return 0;
888 	return (COLS - MAX(COLS / 2, 80));
889 }
890 
891 /* XXX Stub till we decide what to do. */
892 static int
893 view_split_begin_y(int lines)
894 {
895 	return lines * HSPLIT_SCALE;
896 }
897 
898 static const struct got_error *view_resize(struct tog_view *);
899 
900 static const struct got_error *
901 view_splitscreen(struct tog_view *view)
902 {
903 	const struct got_error *err = NULL;
904 
905 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
906 		if (view->resized_y && view->resized_y < view->lines)
907 			view->begin_y = view->resized_y;
908 		else
909 			view->begin_y = view_split_begin_y(view->nlines);
910 		view->begin_x = 0;
911 	} else if (!view->resized) {
912 		if (view->resized_x && view->resized_x < view->cols - 1 &&
913 		    view->cols > 119)
914 			view->begin_x = view->resized_x;
915 		else
916 			view->begin_x = view_split_begin_x(0);
917 		view->begin_y = 0;
918 	}
919 	view->nlines = LINES - view->begin_y;
920 	view->ncols = COLS - view->begin_x;
921 	view->lines = LINES;
922 	view->cols = COLS;
923 	err = view_resize(view);
924 	if (err)
925 		return err;
926 
927 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
928 		view->parent->nlines = view->begin_y;
929 
930 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
931 		return got_error_from_errno("mvwin");
932 
933 	return NULL;
934 }
935 
936 static const struct got_error *
937 view_fullscreen(struct tog_view *view)
938 {
939 	const struct got_error *err = NULL;
940 
941 	view->begin_x = 0;
942 	view->begin_y = view->resized ? view->begin_y : 0;
943 	view->nlines = view->resized ? view->nlines : LINES;
944 	view->ncols = COLS;
945 	view->lines = LINES;
946 	view->cols = COLS;
947 	err = view_resize(view);
948 	if (err)
949 		return err;
950 
951 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
952 		return got_error_from_errno("mvwin");
953 
954 	return NULL;
955 }
956 
957 static int
958 view_is_parent_view(struct tog_view *view)
959 {
960 	return view->parent == NULL;
961 }
962 
963 static int
964 view_is_splitscreen(struct tog_view *view)
965 {
966 	return view->begin_x > 0 || view->begin_y > 0;
967 }
968 
969 static int
970 view_is_fullscreen(struct tog_view *view)
971 {
972 	return view->nlines == LINES && view->ncols == COLS;
973 }
974 
975 static int
976 view_is_hsplit_top(struct tog_view *view)
977 {
978 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
979 	    view_is_splitscreen(view->child);
980 }
981 
982 static void
983 view_border(struct tog_view *view)
984 {
985 	PANEL *panel;
986 	const struct tog_view *view_above;
987 
988 	if (view->parent)
989 		return view_border(view->parent);
990 
991 	panel = panel_above(view->panel);
992 	if (panel == NULL)
993 		return;
994 
995 	view_above = panel_userptr(panel);
996 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
997 		mvwhline(view->window, view_above->begin_y - 1,
998 		    view->begin_x, ACS_HLINE, view->ncols);
999 	else
1000 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1001 		    ACS_VLINE, view->nlines);
1002 }
1003 
1004 static const struct got_error *view_init_hsplit(struct tog_view *, int);
1005 static const struct got_error *request_log_commits(struct tog_view *);
1006 static const struct got_error *offset_selection_down(struct tog_view *);
1007 static void offset_selection_up(struct tog_view *);
1008 static void view_get_split(struct tog_view *, int *, int *);
1009 
1010 static const struct got_error *
1011 view_resize(struct tog_view *view)
1012 {
1013 	const struct got_error	*err = NULL;
1014 	int			 dif, nlines, ncols;
1015 
1016 	dif = LINES - view->lines;  /* line difference */
1017 
1018 	if (view->lines > LINES)
1019 		nlines = view->nlines - (view->lines - LINES);
1020 	else
1021 		nlines = view->nlines + (LINES - view->lines);
1022 	if (view->cols > COLS)
1023 		ncols = view->ncols - (view->cols - COLS);
1024 	else
1025 		ncols = view->ncols + (COLS - view->cols);
1026 
1027 	if (view->child) {
1028 		int hs = view->child->begin_y;
1029 
1030 		if (!view_is_fullscreen(view))
1031 			view->child->begin_x = view_split_begin_x(view->begin_x);
1032 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1033 		    view->child->begin_x == 0) {
1034 			ncols = COLS;
1035 
1036 			view_fullscreen(view->child);
1037 			if (view->child->focussed)
1038 				show_panel(view->child->panel);
1039 			else
1040 				show_panel(view->panel);
1041 		} else {
1042 			ncols = view->child->begin_x;
1043 
1044 			view_splitscreen(view->child);
1045 			show_panel(view->child->panel);
1046 		}
1047 		/*
1048 		 * XXX This is ugly and needs to be moved into the above
1049 		 * logic but "works" for now and my attempts at moving it
1050 		 * break either 'tab' or 'F' key maps in horizontal splits.
1051 		 */
1052 		if (hs) {
1053 			err = view_splitscreen(view->child);
1054 			if (err)
1055 				return err;
1056 			if (dif < 0) { /* top split decreased */
1057 				err = offset_selection_down(view);
1058 				if (err)
1059 					return err;
1060 			}
1061 			view_border(view);
1062 			update_panels();
1063 			doupdate();
1064 			show_panel(view->child->panel);
1065 			nlines = view->nlines;
1066 		}
1067 	} else if (view->parent == NULL)
1068 		ncols = COLS;
1069 
1070 	if (view->resize && dif > 0) {
1071 		err = view->resize(view, dif);
1072 		if (err)
1073 			return err;
1074 	}
1075 
1076 	if (wresize(view->window, nlines, ncols) == ERR)
1077 		return got_error_from_errno("wresize");
1078 	if (replace_panel(view->panel, view->window) == ERR)
1079 		return got_error_from_errno("replace_panel");
1080 	wclear(view->window);
1081 
1082 	view->nlines = nlines;
1083 	view->ncols = ncols;
1084 	view->lines = LINES;
1085 	view->cols = COLS;
1086 
1087 	return NULL;
1088 }
1089 
1090 static const struct got_error *
1091 resize_log_view(struct tog_view *view, int increase)
1092 {
1093 	struct tog_log_view_state	*s = &view->state.log;
1094 	const struct got_error		*err = NULL;
1095 	int				 n = 0;
1096 
1097 	if (s->selected_entry)
1098 		n = s->selected_entry->idx + view->lines - s->selected;
1099 
1100 	/*
1101 	 * Request commits to account for the increased
1102 	 * height so we have enough to populate the view.
1103 	 */
1104 	if (s->commits->ncommits < n) {
1105 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1106 		err = request_log_commits(view);
1107 	}
1108 
1109 	return err;
1110 }
1111 
1112 static void
1113 view_adjust_offset(struct tog_view *view, int n)
1114 {
1115 	if (n == 0)
1116 		return;
1117 
1118 	if (view->parent && view->parent->offset) {
1119 		if (view->parent->offset + n >= 0)
1120 			view->parent->offset += n;
1121 		else
1122 			view->parent->offset = 0;
1123 	} else if (view->offset) {
1124 		if (view->offset - n >= 0)
1125 			view->offset -= n;
1126 		else
1127 			view->offset = 0;
1128 	}
1129 }
1130 
1131 static const struct got_error *
1132 view_resize_split(struct tog_view *view, int resize)
1133 {
1134 	const struct got_error	*err = NULL;
1135 	struct tog_view		*v = NULL;
1136 
1137 	if (view->parent)
1138 		v = view->parent;
1139 	else
1140 		v = view;
1141 
1142 	if (!v->child || !view_is_splitscreen(v->child))
1143 		return NULL;
1144 
1145 	v->resized = v->child->resized = resize;  /* lock for resize event */
1146 
1147 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1148 		if (v->child->resized_y)
1149 			v->child->begin_y = v->child->resized_y;
1150 		if (view->parent)
1151 			v->child->begin_y -= resize;
1152 		else
1153 			v->child->begin_y += resize;
1154 		if (v->child->begin_y < 3) {
1155 			view->count = 0;
1156 			v->child->begin_y = 3;
1157 		} else if (v->child->begin_y > LINES - 1) {
1158 			view->count = 0;
1159 			v->child->begin_y = LINES - 1;
1160 		}
1161 		v->ncols = COLS;
1162 		v->child->ncols = COLS;
1163 		view_adjust_offset(view, resize);
1164 		err = view_init_hsplit(v, v->child->begin_y);
1165 		if (err)
1166 			return err;
1167 		v->child->resized_y = v->child->begin_y;
1168 	} else {
1169 		if (v->child->resized_x)
1170 			v->child->begin_x = v->child->resized_x;
1171 		if (view->parent)
1172 			v->child->begin_x -= resize;
1173 		else
1174 			v->child->begin_x += resize;
1175 		if (v->child->begin_x < 11) {
1176 			view->count = 0;
1177 			v->child->begin_x = 11;
1178 		} else if (v->child->begin_x > COLS - 1) {
1179 			view->count = 0;
1180 			v->child->begin_x = COLS - 1;
1181 		}
1182 		v->child->resized_x = v->child->begin_x;
1183 	}
1184 
1185 	v->child->mode = v->mode;
1186 	v->child->nlines = v->lines - v->child->begin_y;
1187 	v->child->ncols = v->cols - v->child->begin_x;
1188 	v->focus_child = 1;
1189 
1190 	err = view_fullscreen(v);
1191 	if (err)
1192 		return err;
1193 	err = view_splitscreen(v->child);
1194 	if (err)
1195 		return err;
1196 
1197 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1198 		err = offset_selection_down(v->child);
1199 		if (err)
1200 			return err;
1201 	}
1202 
1203 	if (v->resize)
1204 		err = v->resize(v, 0);
1205 	else if (v->child->resize)
1206 		err = v->child->resize(v->child, 0);
1207 
1208 	v->resized = v->child->resized = 0;
1209 
1210 	return err;
1211 }
1212 
1213 static void
1214 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1215 {
1216 	struct tog_view *v = src->child ? src->child : src;
1217 
1218 	dst->resized_x = v->resized_x;
1219 	dst->resized_y = v->resized_y;
1220 }
1221 
1222 static const struct got_error *
1223 view_close_child(struct tog_view *view)
1224 {
1225 	const struct got_error *err = NULL;
1226 
1227 	if (view->child == NULL)
1228 		return NULL;
1229 
1230 	err = view_close(view->child);
1231 	view->child = NULL;
1232 	return err;
1233 }
1234 
1235 static const struct got_error *
1236 view_set_child(struct tog_view *view, struct tog_view *child)
1237 {
1238 	const struct got_error *err = NULL;
1239 
1240 	view->child = child;
1241 	child->parent = view;
1242 
1243 	err = view_resize(view);
1244 	if (err)
1245 		return err;
1246 
1247 	if (view->child->resized_x || view->child->resized_y)
1248 		err = view_resize_split(view, 0);
1249 
1250 	return err;
1251 }
1252 
1253 static const struct got_error *view_dispatch_request(struct tog_view **,
1254     struct tog_view *, enum tog_view_type, int, int);
1255 
1256 static const struct got_error *
1257 view_request_new(struct tog_view **requested, struct tog_view *view,
1258     enum tog_view_type request)
1259 {
1260 	struct tog_view		*new_view = NULL;
1261 	const struct got_error	*err;
1262 	int			 y = 0, x = 0;
1263 
1264 	*requested = NULL;
1265 
1266 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1267 		view_get_split(view, &y, &x);
1268 
1269 	err = view_dispatch_request(&new_view, view, request, y, x);
1270 	if (err)
1271 		return err;
1272 
1273 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1274 	    request != TOG_VIEW_HELP) {
1275 		err = view_init_hsplit(view, y);
1276 		if (err)
1277 			return err;
1278 	}
1279 
1280 	view->focussed = 0;
1281 	new_view->focussed = 1;
1282 	new_view->mode = view->mode;
1283 	new_view->nlines = request == TOG_VIEW_HELP ?
1284 	    view->lines : view->lines - y;
1285 
1286 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1287 		view_transfer_size(new_view, view);
1288 		err = view_close_child(view);
1289 		if (err)
1290 			return err;
1291 		err = view_set_child(view, new_view);
1292 		if (err)
1293 			return err;
1294 		view->focus_child = 1;
1295 	} else
1296 		*requested = new_view;
1297 
1298 	return NULL;
1299 }
1300 
1301 static void
1302 tog_resizeterm(void)
1303 {
1304 	int cols, lines;
1305 	struct winsize size;
1306 
1307 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1308 		cols = 80;     /* Default */
1309 		lines = 24;
1310 	} else {
1311 		cols = size.ws_col;
1312 		lines = size.ws_row;
1313 	}
1314 	resize_term(lines, cols);
1315 }
1316 
1317 static const struct got_error *
1318 view_search_start(struct tog_view *view, int fast_refresh)
1319 {
1320 	const struct got_error *err = NULL;
1321 	struct tog_view *v = view;
1322 	char pattern[1024];
1323 	int ret;
1324 
1325 	if (view->search_started) {
1326 		regfree(&view->regex);
1327 		view->searching = 0;
1328 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1329 	}
1330 	view->search_started = 0;
1331 
1332 	if (view->nlines < 1)
1333 		return NULL;
1334 
1335 	if (view_is_hsplit_top(view))
1336 		v = view->child;
1337 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1338 		v = view->parent;
1339 
1340 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1341 	wclrtoeol(v->window);
1342 
1343 	nodelay(v->window, FALSE);  /* block for search term input */
1344 	nocbreak();
1345 	echo();
1346 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1347 	wrefresh(v->window);
1348 	cbreak();
1349 	noecho();
1350 	nodelay(v->window, TRUE);
1351 	if (!fast_refresh && !using_mock_io)
1352 		halfdelay(10);
1353 	if (ret == ERR)
1354 		return NULL;
1355 
1356 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1357 		err = view->search_start(view);
1358 		if (err) {
1359 			regfree(&view->regex);
1360 			return err;
1361 		}
1362 		view->search_started = 1;
1363 		view->searching = TOG_SEARCH_FORWARD;
1364 		view->search_next_done = 0;
1365 		view->search_next(view);
1366 	}
1367 
1368 	return NULL;
1369 }
1370 
1371 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1372 static const struct got_error *
1373 switch_split(struct tog_view *view)
1374 {
1375 	const struct got_error	*err = NULL;
1376 	struct tog_view		*v = NULL;
1377 
1378 	if (view->parent)
1379 		v = view->parent;
1380 	else
1381 		v = view;
1382 
1383 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1384 		v->mode = TOG_VIEW_SPLIT_VERT;
1385 	else
1386 		v->mode = TOG_VIEW_SPLIT_HRZN;
1387 
1388 	if (!v->child)
1389 		return NULL;
1390 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1391 		v->mode = TOG_VIEW_SPLIT_NONE;
1392 
1393 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1394 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1395 		v->child->begin_y = v->child->resized_y;
1396 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1397 		v->child->begin_x = v->child->resized_x;
1398 
1399 
1400 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1401 		v->ncols = COLS;
1402 		v->child->ncols = COLS;
1403 		v->child->nscrolled = LINES - v->child->nlines;
1404 
1405 		err = view_init_hsplit(v, v->child->begin_y);
1406 		if (err)
1407 			return err;
1408 	}
1409 	v->child->mode = v->mode;
1410 	v->child->nlines = v->lines - v->child->begin_y;
1411 	v->focus_child = 1;
1412 
1413 	err = view_fullscreen(v);
1414 	if (err)
1415 		return err;
1416 	err = view_splitscreen(v->child);
1417 	if (err)
1418 		return err;
1419 
1420 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1421 		v->mode = TOG_VIEW_SPLIT_VERT;
1422 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1423 		err = offset_selection_down(v);
1424 		if (err)
1425 			return err;
1426 		err = offset_selection_down(v->child);
1427 		if (err)
1428 			return err;
1429 	} else {
1430 		offset_selection_up(v);
1431 		offset_selection_up(v->child);
1432 	}
1433 	if (v->resize)
1434 		err = v->resize(v, 0);
1435 	else if (v->child->resize)
1436 		err = v->child->resize(v->child, 0);
1437 
1438 	return err;
1439 }
1440 
1441 /*
1442  * Strip trailing whitespace from str starting at byte *n;
1443  * if *n < 0, use strlen(str). Return new str length in *n.
1444  */
1445 static void
1446 strip_trailing_ws(char *str, int *n)
1447 {
1448 	size_t x = *n;
1449 
1450 	if (str == NULL || *str == '\0')
1451 		return;
1452 
1453 	if (x < 0)
1454 		x = strlen(str);
1455 
1456 	while (x-- > 0 && isspace((unsigned char)str[x]))
1457 		str[x] = '\0';
1458 
1459 	*n = x + 1;
1460 }
1461 
1462 /*
1463  * Extract visible substring of line y from the curses screen
1464  * and strip trailing whitespace. If vline is set, overwrite
1465  * line[vline] with '|' because the ACS_VLINE character is
1466  * written out as 'x'. Write the line to file f.
1467  */
1468 static const struct got_error *
1469 view_write_line(FILE *f, int y, int vline)
1470 {
1471 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1472 	int	r, w;
1473 
1474 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1475 	if (r == ERR)
1476 		return got_error_fmt(GOT_ERR_RANGE,
1477 		    "failed to extract line %d", y);
1478 
1479 	/*
1480 	 * In some views, lines are padded with blanks to COLS width.
1481 	 * Strip them so we can diff without the -b flag when testing.
1482 	 */
1483 	strip_trailing_ws(line, &r);
1484 
1485 	if (vline > 0)
1486 		line[vline] = '|';
1487 
1488 	w = fprintf(f, "%s\n", line);
1489 	if (w != r + 1)		/* \n */
1490 		return got_ferror(f, GOT_ERR_IO);
1491 
1492 	return NULL;
1493 }
1494 
1495 /*
1496  * Capture the visible curses screen by writing each line to the
1497  * file at the path set via the TOG_SCR_DUMP environment variable.
1498  */
1499 static const struct got_error *
1500 screendump(struct tog_view *view)
1501 {
1502 	const struct got_error	*err;
1503 	int			 i;
1504 
1505 	err = got_opentemp_truncate(tog_io.sdump);
1506 	if (err)
1507 		return err;
1508 
1509 	if ((view->child && view->child->begin_x) ||
1510 	    (view->parent && view->begin_x)) {
1511 		int ncols = view->child ? view->ncols : view->parent->ncols;
1512 
1513 		/* vertical splitscreen */
1514 		for (i = 0; i < view->nlines; ++i) {
1515 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1516 			if (err)
1517 				goto done;
1518 		}
1519 	} else {
1520 		int hline = 0;
1521 
1522 		/* fullscreen or horizontal splitscreen */
1523 		if ((view->child && view->child->begin_y) ||
1524 		    (view->parent && view->begin_y))	/* hsplit */
1525 			hline = view->child ?
1526 			    view->child->begin_y : view->begin_y;
1527 
1528 		for (i = 0; i < view->lines; i++) {
1529 			if (hline && i == hline - 1) {
1530 				int c;
1531 
1532 				/* ACS_HLINE writes out as 'q', overwrite it */
1533 				for (c = 0; c < view->cols; ++c)
1534 					fputc('-', tog_io.sdump);
1535 				fputc('\n', tog_io.sdump);
1536 				continue;
1537 			}
1538 
1539 			err = view_write_line(tog_io.sdump, i, 0);
1540 			if (err)
1541 				goto done;
1542 		}
1543 	}
1544 
1545 done:
1546 	return err;
1547 }
1548 
1549 /*
1550  * Compute view->count from numeric input. Assign total to view->count and
1551  * return first non-numeric key entered.
1552  */
1553 static int
1554 get_compound_key(struct tog_view *view, int c)
1555 {
1556 	struct tog_view	*v = view;
1557 	int		 x, n = 0;
1558 
1559 	if (view_is_hsplit_top(view))
1560 		v = view->child;
1561 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1562 		v = view->parent;
1563 
1564 	view->count = 0;
1565 	cbreak();  /* block for input */
1566 	nodelay(view->window, FALSE);
1567 	wmove(v->window, v->nlines - 1, 0);
1568 	wclrtoeol(v->window);
1569 	waddch(v->window, ':');
1570 
1571 	do {
1572 		x = getcurx(v->window);
1573 		if (x != ERR && x < view->ncols) {
1574 			waddch(v->window, c);
1575 			wrefresh(v->window);
1576 		}
1577 
1578 		/*
1579 		 * Don't overflow. Max valid request should be the greatest
1580 		 * between the longest and total lines; cap at 10 million.
1581 		 */
1582 		if (n >= 9999999)
1583 			n = 9999999;
1584 		else
1585 			n = n * 10 + (c - '0');
1586 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1587 
1588 	if (c == 'G' || c == 'g') {	/* nG key map */
1589 		view->gline = view->hiline = n;
1590 		n = 0;
1591 		c = 0;
1592 	}
1593 
1594 	/* Massage excessive or inapplicable values at the input handler. */
1595 	view->count = n;
1596 
1597 	return c;
1598 }
1599 
1600 static void
1601 action_report(struct tog_view *view)
1602 {
1603 	struct tog_view *v = view;
1604 
1605 	if (view_is_hsplit_top(view))
1606 		v = view->child;
1607 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1608 		v = view->parent;
1609 
1610 	wmove(v->window, v->nlines - 1, 0);
1611 	wclrtoeol(v->window);
1612 	wprintw(v->window, ":%s", view->action);
1613 	wrefresh(v->window);
1614 
1615 	/*
1616 	 * Clear action status report. Only clear in blame view
1617 	 * once annotating is complete, otherwise it's too fast.
1618 	 */
1619 	if (view->type == TOG_VIEW_BLAME) {
1620 		if (view->state.blame.blame_complete)
1621 			view->action = NULL;
1622 	} else
1623 		view->action = NULL;
1624 }
1625 
1626 /*
1627  * Read the next line from the test script and assign
1628  * key instruction to *ch. If at EOF, set the *done flag.
1629  */
1630 static const struct got_error *
1631 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1632 {
1633 	const struct got_error	*err = NULL;
1634 	char			*line = NULL;
1635 	size_t			 linesz = 0;
1636 
1637 	if (view->count && --view->count) {
1638 		*ch = view->ch;
1639 		return NULL;
1640 	} else
1641 		*ch = -1;
1642 
1643 	if (getline(&line, &linesz, script) == -1) {
1644 		if (feof(script)) {
1645 			*done = 1;
1646 			goto done;
1647 		} else {
1648 			err = got_ferror(script, GOT_ERR_IO);
1649 			goto done;
1650 		}
1651 	}
1652 
1653 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1654 		tog_io.wait_for_ui = 1;
1655 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1656 		*ch = KEY_ENTER;
1657 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1658 		*ch = KEY_RIGHT;
1659 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1660 		*ch = KEY_LEFT;
1661 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1662 		*ch = KEY_DOWN;
1663 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1664 		*ch = KEY_UP;
1665 	else if (strncasecmp(line, "TAB", 3) == 0)
1666 		*ch = '\t';
1667 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1668 		*ch = TOG_KEY_SCRDUMP;
1669 	else if (isdigit((unsigned char)*line)) {
1670 		char *t = line;
1671 
1672 		while (isdigit((unsigned char)*t))
1673 			++t;
1674 		view->ch = *ch = *t;
1675 		*t = '\0';
1676 		/* ignore error, view->count is 0 if instruction is invalid */
1677 		view->count = strtonum(line, 0, INT_MAX, NULL);
1678 	} else
1679 		*ch = *line;
1680 
1681 done:
1682 	free(line);
1683 	return err;
1684 }
1685 
1686 static const struct got_error *
1687 view_input(struct tog_view **new, int *done, struct tog_view *view,
1688     struct tog_view_list_head *views, int fast_refresh)
1689 {
1690 	const struct got_error *err = NULL;
1691 	struct tog_view *v;
1692 	int ch, errcode;
1693 
1694 	*new = NULL;
1695 
1696 	if (view->action)
1697 		action_report(view);
1698 
1699 	/* Clear "no matches" indicator. */
1700 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1701 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1702 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1703 		view->count = 0;
1704 	}
1705 
1706 	if (view->searching && !view->search_next_done) {
1707 		errcode = pthread_mutex_unlock(&tog_mutex);
1708 		if (errcode)
1709 			return got_error_set_errno(errcode,
1710 			    "pthread_mutex_unlock");
1711 		sched_yield();
1712 		errcode = pthread_mutex_lock(&tog_mutex);
1713 		if (errcode)
1714 			return got_error_set_errno(errcode,
1715 			    "pthread_mutex_lock");
1716 		view->search_next(view);
1717 		return NULL;
1718 	}
1719 
1720 	/* Allow threads to make progress while we are waiting for input. */
1721 	errcode = pthread_mutex_unlock(&tog_mutex);
1722 	if (errcode)
1723 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1724 
1725 	if (using_mock_io) {
1726 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1727 		if (err) {
1728 			errcode = pthread_mutex_lock(&tog_mutex);
1729 			return err;
1730 		}
1731 	} else if (view->count && --view->count) {
1732 		cbreak();
1733 		nodelay(view->window, TRUE);
1734 		ch = wgetch(view->window);
1735 		/* let C-g or backspace abort unfinished count */
1736 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1737 			view->count = 0;
1738 		else
1739 			ch = view->ch;
1740 	} else {
1741 		ch = wgetch(view->window);
1742 		if (ch >= '1' && ch  <= '9')
1743 			view->ch = ch = get_compound_key(view, ch);
1744 	}
1745 	if (view->hiline && ch != ERR && ch != 0)
1746 		view->hiline = 0;  /* key pressed, clear line highlight */
1747 	nodelay(view->window, TRUE);
1748 	errcode = pthread_mutex_lock(&tog_mutex);
1749 	if (errcode)
1750 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1751 
1752 	if (tog_sigwinch_received || tog_sigcont_received) {
1753 		tog_resizeterm();
1754 		tog_sigwinch_received = 0;
1755 		tog_sigcont_received = 0;
1756 		TAILQ_FOREACH(v, views, entry) {
1757 			err = view_resize(v);
1758 			if (err)
1759 				return err;
1760 			err = v->input(new, v, KEY_RESIZE);
1761 			if (err)
1762 				return err;
1763 			if (v->child) {
1764 				err = view_resize(v->child);
1765 				if (err)
1766 					return err;
1767 				err = v->child->input(new, v->child,
1768 				    KEY_RESIZE);
1769 				if (err)
1770 					return err;
1771 				if (v->child->resized_x || v->child->resized_y) {
1772 					err = view_resize_split(v, 0);
1773 					if (err)
1774 						return err;
1775 				}
1776 			}
1777 		}
1778 	}
1779 
1780 	switch (ch) {
1781 	case '?':
1782 	case 'H':
1783 	case KEY_F(1):
1784 		if (view->type == TOG_VIEW_HELP)
1785 			err = view->reset(view);
1786 		else
1787 			err = view_request_new(new, view, TOG_VIEW_HELP);
1788 		break;
1789 	case '\t':
1790 		view->count = 0;
1791 		if (view->child) {
1792 			view->focussed = 0;
1793 			view->child->focussed = 1;
1794 			view->focus_child = 1;
1795 		} else if (view->parent) {
1796 			view->focussed = 0;
1797 			view->parent->focussed = 1;
1798 			view->parent->focus_child = 0;
1799 			if (!view_is_splitscreen(view)) {
1800 				if (view->parent->resize) {
1801 					err = view->parent->resize(view->parent,
1802 					    0);
1803 					if (err)
1804 						return err;
1805 				}
1806 				offset_selection_up(view->parent);
1807 				err = view_fullscreen(view->parent);
1808 				if (err)
1809 					return err;
1810 			}
1811 		}
1812 		break;
1813 	case 'q':
1814 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1815 			if (view->parent->resize) {
1816 				/* might need more commits to fill fullscreen */
1817 				err = view->parent->resize(view->parent, 0);
1818 				if (err)
1819 					break;
1820 			}
1821 			offset_selection_up(view->parent);
1822 		}
1823 		err = view->input(new, view, ch);
1824 		view->dying = 1;
1825 		break;
1826 	case 'Q':
1827 		*done = 1;
1828 		break;
1829 	case 'F':
1830 		view->count = 0;
1831 		if (view_is_parent_view(view)) {
1832 			if (view->child == NULL)
1833 				break;
1834 			if (view_is_splitscreen(view->child)) {
1835 				view->focussed = 0;
1836 				view->child->focussed = 1;
1837 				err = view_fullscreen(view->child);
1838 			} else {
1839 				err = view_splitscreen(view->child);
1840 				if (!err)
1841 					err = view_resize_split(view, 0);
1842 			}
1843 			if (err)
1844 				break;
1845 			err = view->child->input(new, view->child,
1846 			    KEY_RESIZE);
1847 		} else {
1848 			if (view_is_splitscreen(view)) {
1849 				view->parent->focussed = 0;
1850 				view->focussed = 1;
1851 				err = view_fullscreen(view);
1852 			} else {
1853 				err = view_splitscreen(view);
1854 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1855 					err = view_resize(view->parent);
1856 				if (!err)
1857 					err = view_resize_split(view, 0);
1858 			}
1859 			if (err)
1860 				break;
1861 			err = view->input(new, view, KEY_RESIZE);
1862 		}
1863 		if (err)
1864 			break;
1865 		if (view->resize) {
1866 			err = view->resize(view, 0);
1867 			if (err)
1868 				break;
1869 		}
1870 		if (view->parent) {
1871 			if (view->parent->resize) {
1872 				err = view->parent->resize(view->parent, 0);
1873 				if (err != NULL)
1874 					break;
1875 			}
1876 			err = offset_selection_down(view->parent);
1877 			if (err != NULL)
1878 				break;
1879 		}
1880 		err = offset_selection_down(view);
1881 		break;
1882 	case 'S':
1883 		view->count = 0;
1884 		err = switch_split(view);
1885 		break;
1886 	case '-':
1887 		err = view_resize_split(view, -1);
1888 		break;
1889 	case '+':
1890 		err = view_resize_split(view, 1);
1891 		break;
1892 	case KEY_RESIZE:
1893 		break;
1894 	case '/':
1895 		view->count = 0;
1896 		if (view->search_start)
1897 			view_search_start(view, fast_refresh);
1898 		else
1899 			err = view->input(new, view, ch);
1900 		break;
1901 	case 'N':
1902 	case 'n':
1903 		if (view->search_started && view->search_next) {
1904 			view->searching = (ch == 'n' ?
1905 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1906 			view->search_next_done = 0;
1907 			view->search_next(view);
1908 		} else
1909 			err = view->input(new, view, ch);
1910 		break;
1911 	case 'A':
1912 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1913 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1914 			view->action = "Patience diff algorithm";
1915 		} else {
1916 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1917 			view->action = "Myers diff algorithm";
1918 		}
1919 		TAILQ_FOREACH(v, views, entry) {
1920 			if (v->reset) {
1921 				err = v->reset(v);
1922 				if (err)
1923 					return err;
1924 			}
1925 			if (v->child && v->child->reset) {
1926 				err = v->child->reset(v->child);
1927 				if (err)
1928 					return err;
1929 			}
1930 		}
1931 		break;
1932 	case TOG_KEY_SCRDUMP:
1933 		err = screendump(view);
1934 		break;
1935 	default:
1936 		err = view->input(new, view, ch);
1937 		break;
1938 	}
1939 
1940 	return err;
1941 }
1942 
1943 static int
1944 view_needs_focus_indication(struct tog_view *view)
1945 {
1946 	if (view_is_parent_view(view)) {
1947 		if (view->child == NULL || view->child->focussed)
1948 			return 0;
1949 		if (!view_is_splitscreen(view->child))
1950 			return 0;
1951 	} else if (!view_is_splitscreen(view))
1952 		return 0;
1953 
1954 	return view->focussed;
1955 }
1956 
1957 static const struct got_error *
1958 tog_io_close(void)
1959 {
1960 	const struct got_error *err = NULL;
1961 
1962 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1963 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1964 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1965 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1966 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1967 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1968 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1969 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1970 
1971 	return err;
1972 }
1973 
1974 static const struct got_error *
1975 view_loop(struct tog_view *view)
1976 {
1977 	const struct got_error *err = NULL;
1978 	struct tog_view_list_head views;
1979 	struct tog_view *new_view;
1980 	char *mode;
1981 	int fast_refresh = 10;
1982 	int done = 0, errcode;
1983 
1984 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1985 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1986 		view->mode = TOG_VIEW_SPLIT_VERT;
1987 	else
1988 		view->mode = TOG_VIEW_SPLIT_HRZN;
1989 
1990 	errcode = pthread_mutex_lock(&tog_mutex);
1991 	if (errcode)
1992 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1993 
1994 	TAILQ_INIT(&views);
1995 	TAILQ_INSERT_HEAD(&views, view, entry);
1996 
1997 	view->focussed = 1;
1998 	err = view->show(view);
1999 	if (err)
2000 		return err;
2001 	update_panels();
2002 	doupdate();
2003 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
2004 	    !tog_fatal_signal_received()) {
2005 		/* Refresh fast during initialization, then become slower. */
2006 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2007 			halfdelay(10); /* switch to once per second */
2008 
2009 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2010 		if (err)
2011 			break;
2012 
2013 		if (view->dying && view == TAILQ_FIRST(&views) &&
2014 		    TAILQ_NEXT(view, entry) == NULL)
2015 			done = 1;
2016 		if (done) {
2017 			struct tog_view *v;
2018 
2019 			/*
2020 			 * When we quit, scroll the screen up a single line
2021 			 * so we don't lose any information.
2022 			 */
2023 			TAILQ_FOREACH(v, &views, entry) {
2024 				wmove(v->window, 0, 0);
2025 				wdeleteln(v->window);
2026 				wnoutrefresh(v->window);
2027 				if (v->child && !view_is_fullscreen(v)) {
2028 					wmove(v->child->window, 0, 0);
2029 					wdeleteln(v->child->window);
2030 					wnoutrefresh(v->child->window);
2031 				}
2032 			}
2033 			doupdate();
2034 		}
2035 
2036 		if (view->dying) {
2037 			struct tog_view *v, *prev = NULL;
2038 
2039 			if (view_is_parent_view(view))
2040 				prev = TAILQ_PREV(view, tog_view_list_head,
2041 				    entry);
2042 			else if (view->parent)
2043 				prev = view->parent;
2044 
2045 			if (view->parent) {
2046 				view->parent->child = NULL;
2047 				view->parent->focus_child = 0;
2048 				/* Restore fullscreen line height. */
2049 				view->parent->nlines = view->parent->lines;
2050 				err = view_resize(view->parent);
2051 				if (err)
2052 					break;
2053 				/* Make resized splits persist. */
2054 				view_transfer_size(view->parent, view);
2055 			} else
2056 				TAILQ_REMOVE(&views, view, entry);
2057 
2058 			err = view_close(view);
2059 			if (err)
2060 				goto done;
2061 
2062 			view = NULL;
2063 			TAILQ_FOREACH(v, &views, entry) {
2064 				if (v->focussed)
2065 					break;
2066 			}
2067 			if (view == NULL && new_view == NULL) {
2068 				/* No view has focus. Try to pick one. */
2069 				if (prev)
2070 					view = prev;
2071 				else if (!TAILQ_EMPTY(&views)) {
2072 					view = TAILQ_LAST(&views,
2073 					    tog_view_list_head);
2074 				}
2075 				if (view) {
2076 					if (view->focus_child) {
2077 						view->child->focussed = 1;
2078 						view = view->child;
2079 					} else
2080 						view->focussed = 1;
2081 				}
2082 			}
2083 		}
2084 		if (new_view) {
2085 			struct tog_view *v, *t;
2086 			/* Only allow one parent view per type. */
2087 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2088 				if (v->type != new_view->type)
2089 					continue;
2090 				TAILQ_REMOVE(&views, v, entry);
2091 				err = view_close(v);
2092 				if (err)
2093 					goto done;
2094 				break;
2095 			}
2096 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2097 			view = new_view;
2098 		}
2099 		if (view && !done) {
2100 			if (view_is_parent_view(view)) {
2101 				if (view->child && view->child->focussed)
2102 					view = view->child;
2103 			} else {
2104 				if (view->parent && view->parent->focussed)
2105 					view = view->parent;
2106 			}
2107 			show_panel(view->panel);
2108 			if (view->child && view_is_splitscreen(view->child))
2109 				show_panel(view->child->panel);
2110 			if (view->parent && view_is_splitscreen(view)) {
2111 				err = view->parent->show(view->parent);
2112 				if (err)
2113 					goto done;
2114 			}
2115 			err = view->show(view);
2116 			if (err)
2117 				goto done;
2118 			if (view->child) {
2119 				err = view->child->show(view->child);
2120 				if (err)
2121 					goto done;
2122 			}
2123 			update_panels();
2124 			doupdate();
2125 		}
2126 	}
2127 done:
2128 	while (!TAILQ_EMPTY(&views)) {
2129 		const struct got_error *close_err;
2130 		view = TAILQ_FIRST(&views);
2131 		TAILQ_REMOVE(&views, view, entry);
2132 		close_err = view_close(view);
2133 		if (close_err && err == NULL)
2134 			err = close_err;
2135 	}
2136 
2137 	errcode = pthread_mutex_unlock(&tog_mutex);
2138 	if (errcode && err == NULL)
2139 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2140 
2141 	return err;
2142 }
2143 
2144 __dead static void
2145 usage_log(void)
2146 {
2147 	endwin();
2148 	fprintf(stderr,
2149 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2150 	    getprogname());
2151 	exit(1);
2152 }
2153 
2154 /* Create newly allocated wide-character string equivalent to a byte string. */
2155 static const struct got_error *
2156 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2157 {
2158 	char *vis = NULL;
2159 	const struct got_error *err = NULL;
2160 
2161 	*ws = NULL;
2162 	*wlen = mbstowcs(NULL, s, 0);
2163 	if (*wlen == (size_t)-1) {
2164 		int vislen;
2165 		if (errno != EILSEQ)
2166 			return got_error_from_errno("mbstowcs");
2167 
2168 		/* byte string invalid in current encoding; try to "fix" it */
2169 		err = got_mbsavis(&vis, &vislen, s);
2170 		if (err)
2171 			return err;
2172 		*wlen = mbstowcs(NULL, vis, 0);
2173 		if (*wlen == (size_t)-1) {
2174 			err = got_error_from_errno("mbstowcs"); /* give up */
2175 			goto done;
2176 		}
2177 	}
2178 
2179 	*ws = calloc(*wlen + 1, sizeof(**ws));
2180 	if (*ws == NULL) {
2181 		err = got_error_from_errno("calloc");
2182 		goto done;
2183 	}
2184 
2185 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2186 		err = got_error_from_errno("mbstowcs");
2187 done:
2188 	free(vis);
2189 	if (err) {
2190 		free(*ws);
2191 		*ws = NULL;
2192 		*wlen = 0;
2193 	}
2194 	return err;
2195 }
2196 
2197 static const struct got_error *
2198 expand_tab(char **ptr, const char *src)
2199 {
2200 	char	*dst;
2201 	size_t	 len, n, idx = 0, sz = 0;
2202 
2203 	*ptr = NULL;
2204 	n = len = strlen(src);
2205 	dst = malloc(n + 1);
2206 	if (dst == NULL)
2207 		return got_error_from_errno("malloc");
2208 
2209 	while (idx < len && src[idx]) {
2210 		const char c = src[idx];
2211 
2212 		if (c == '\t') {
2213 			size_t nb = TABSIZE - sz % TABSIZE;
2214 			char *p;
2215 
2216 			p = realloc(dst, n + nb);
2217 			if (p == NULL) {
2218 				free(dst);
2219 				return got_error_from_errno("realloc");
2220 
2221 			}
2222 			dst = p;
2223 			n += nb;
2224 			memset(dst + sz, ' ', nb);
2225 			sz += nb;
2226 		} else
2227 			dst[sz++] = src[idx];
2228 		++idx;
2229 	}
2230 
2231 	dst[sz] = '\0';
2232 	*ptr = dst;
2233 	return NULL;
2234 }
2235 
2236 /*
2237  * Advance at most n columns from wline starting at offset off.
2238  * Return the index to the first character after the span operation.
2239  * Return the combined column width of all spanned wide characters in
2240  * *rcol.
2241  */
2242 static int
2243 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2244 {
2245 	int width, i, cols = 0;
2246 
2247 	if (n == 0) {
2248 		*rcol = cols;
2249 		return off;
2250 	}
2251 
2252 	for (i = off; wline[i] != L'\0'; ++i) {
2253 		if (wline[i] == L'\t')
2254 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2255 		else
2256 			width = wcwidth(wline[i]);
2257 
2258 		if (width == -1) {
2259 			width = 1;
2260 			wline[i] = L'.';
2261 		}
2262 
2263 		if (cols + width > n)
2264 			break;
2265 		cols += width;
2266 	}
2267 
2268 	*rcol = cols;
2269 	return i;
2270 }
2271 
2272 /*
2273  * Format a line for display, ensuring that it won't overflow a width limit.
2274  * With scrolling, the width returned refers to the scrolled version of the
2275  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2276  */
2277 static const struct got_error *
2278 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2279     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2280 {
2281 	const struct got_error *err = NULL;
2282 	int cols;
2283 	wchar_t *wline = NULL;
2284 	char *exstr = NULL;
2285 	size_t wlen;
2286 	int i, scrollx;
2287 
2288 	*wlinep = NULL;
2289 	*widthp = 0;
2290 
2291 	if (expand) {
2292 		err = expand_tab(&exstr, line);
2293 		if (err)
2294 			return err;
2295 	}
2296 
2297 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2298 	free(exstr);
2299 	if (err)
2300 		return err;
2301 
2302 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2303 
2304 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2305 		wline[wlen - 1] = L'\0';
2306 		wlen--;
2307 	}
2308 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2309 		wline[wlen - 1] = L'\0';
2310 		wlen--;
2311 	}
2312 
2313 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2314 	wline[i] = L'\0';
2315 
2316 	if (widthp)
2317 		*widthp = cols;
2318 	if (scrollxp)
2319 		*scrollxp = scrollx;
2320 	if (err)
2321 		free(wline);
2322 	else
2323 		*wlinep = wline;
2324 	return err;
2325 }
2326 
2327 static const struct got_error*
2328 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2329     struct got_object_id *id, struct got_repository *repo)
2330 {
2331 	static const struct got_error *err = NULL;
2332 	struct got_reflist_entry *re;
2333 	char *s;
2334 	const char *name;
2335 
2336 	*refs_str = NULL;
2337 
2338 	if (refs == NULL)
2339 		return NULL;
2340 
2341 	TAILQ_FOREACH(re, refs, entry) {
2342 		struct got_tag_object *tag = NULL;
2343 		struct got_object_id *ref_id;
2344 		int cmp;
2345 
2346 		name = got_ref_get_name(re->ref);
2347 		if (strcmp(name, GOT_REF_HEAD) == 0)
2348 			continue;
2349 		if (strncmp(name, "refs/", 5) == 0)
2350 			name += 5;
2351 		if (strncmp(name, "got/", 4) == 0)
2352 			continue;
2353 		if (strncmp(name, "heads/", 6) == 0)
2354 			name += 6;
2355 		if (strncmp(name, "remotes/", 8) == 0) {
2356 			name += 8;
2357 			s = strstr(name, "/" GOT_REF_HEAD);
2358 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2359 				continue;
2360 		}
2361 		err = got_ref_resolve(&ref_id, repo, re->ref);
2362 		if (err)
2363 			break;
2364 		if (strncmp(name, "tags/", 5) == 0) {
2365 			err = got_object_open_as_tag(&tag, repo, ref_id);
2366 			if (err) {
2367 				if (err->code != GOT_ERR_OBJ_TYPE) {
2368 					free(ref_id);
2369 					break;
2370 				}
2371 				/* Ref points at something other than a tag. */
2372 				err = NULL;
2373 				tag = NULL;
2374 			}
2375 		}
2376 		cmp = got_object_id_cmp(tag ?
2377 		    got_object_tag_get_object_id(tag) : ref_id, id);
2378 		free(ref_id);
2379 		if (tag)
2380 			got_object_tag_close(tag);
2381 		if (cmp != 0)
2382 			continue;
2383 		s = *refs_str;
2384 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2385 		    s ? ", " : "", name) == -1) {
2386 			err = got_error_from_errno("asprintf");
2387 			free(s);
2388 			*refs_str = NULL;
2389 			break;
2390 		}
2391 		free(s);
2392 	}
2393 
2394 	return err;
2395 }
2396 
2397 static const struct got_error *
2398 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2399     int col_tab_align)
2400 {
2401 	char *smallerthan;
2402 
2403 	smallerthan = strchr(author, '<');
2404 	if (smallerthan && smallerthan[1] != '\0')
2405 		author = smallerthan + 1;
2406 	author[strcspn(author, "@>")] = '\0';
2407 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2408 	    col_tab_align, 0);
2409 }
2410 
2411 static const struct got_error *
2412 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2413     const size_t date_display_cols, int author_display_cols)
2414 {
2415 	struct tog_log_view_state *s = &view->state.log;
2416 	const struct got_error *err = NULL;
2417 	struct got_commit_object *commit = entry->commit;
2418 	struct got_object_id *id = entry->id;
2419 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2420 	char *refs_str = NULL;
2421 	char *logmsg0 = NULL, *logmsg = NULL;
2422 	char *author = NULL;
2423 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2424 	int author_width, refstr_width, logmsg_width;
2425 	char *newline, *line = NULL;
2426 	int col, limit, scrollx, logmsg_x;
2427 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2428 	struct tm tm;
2429 	time_t committer_time;
2430 	struct tog_color *tc;
2431 	struct got_reflist_head *refs;
2432 
2433 	if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2434 	    got_object_id_cmp(id, tog_base_commit.id) == 0)
2435 		tog_base_commit.idx = entry->idx;
2436 	if (tog_io.wait_for_ui && s->thread_args.need_commit_marker) {
2437 		int rc;
2438 
2439 		rc = pthread_cond_wait(&s->thread_args.log_loaded, &tog_mutex);
2440 		if (rc)
2441 			return got_error_set_errno(rc, "pthread_cond_wait");
2442 	}
2443 
2444 	committer_time = got_object_commit_get_committer_time(commit);
2445 	if (gmtime_r(&committer_time, &tm) == NULL)
2446 		return got_error_from_errno("gmtime_r");
2447 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2448 		return got_error(GOT_ERR_NO_SPACE);
2449 
2450 	if (avail <= date_display_cols)
2451 		limit = MIN(sizeof(datebuf) - 1, avail);
2452 	else
2453 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2454 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2455 	if (tc)
2456 		wattr_on(view->window,
2457 		    COLOR_PAIR(tc->colorpair), NULL);
2458 	waddnstr(view->window, datebuf, limit);
2459 	if (tc)
2460 		wattr_off(view->window,
2461 		    COLOR_PAIR(tc->colorpair), NULL);
2462 	col = limit;
2463 	if (col > avail)
2464 		goto done;
2465 
2466 	if (avail >= 120) {
2467 		char *id_str;
2468 		err = got_object_id_str(&id_str, id);
2469 		if (err)
2470 			goto done;
2471 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2472 		if (tc)
2473 			wattr_on(view->window,
2474 			    COLOR_PAIR(tc->colorpair), NULL);
2475 		wprintw(view->window, "%.8s ", id_str);
2476 		if (tc)
2477 			wattr_off(view->window,
2478 			    COLOR_PAIR(tc->colorpair), NULL);
2479 		free(id_str);
2480 		col += 9;
2481 		if (col > avail)
2482 			goto done;
2483 	}
2484 
2485 	if (s->use_committer)
2486 		author = strdup(got_object_commit_get_committer(commit));
2487 	else
2488 		author = strdup(got_object_commit_get_author(commit));
2489 	if (author == NULL) {
2490 		err = got_error_from_errno("strdup");
2491 		goto done;
2492 	}
2493 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2494 	if (err)
2495 		goto done;
2496 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2497 	if (tc)
2498 		wattr_on(view->window,
2499 		    COLOR_PAIR(tc->colorpair), NULL);
2500 	waddwstr(view->window, wauthor);
2501 	col += author_width;
2502 	while (col < avail && author_width < author_display_cols + 2) {
2503 		if (tog_base_commit.marker != GOT_WORKTREE_STATE_UNKNOWN &&
2504 		    author_width == marker_column &&
2505 		    entry->idx == tog_base_commit.idx && !s->limit_view) {
2506 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2507 			if (tc)
2508 				wattr_on(view->window,
2509 				    COLOR_PAIR(tc->colorpair), NULL);
2510 			waddch(view->window, tog_base_commit.marker);
2511 			if (tc)
2512 				wattr_off(view->window,
2513 				    COLOR_PAIR(tc->colorpair), NULL);
2514 		} else
2515 			waddch(view->window, ' ');
2516 		col++;
2517 		author_width++;
2518 	}
2519 	if (tc)
2520 		wattr_off(view->window,
2521 		    COLOR_PAIR(tc->colorpair), NULL);
2522 	if (col > avail)
2523 		goto done;
2524 
2525 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2526 	if (err)
2527 		goto done;
2528 	logmsg = logmsg0;
2529 	while (*logmsg == '\n')
2530 		logmsg++;
2531 	newline = strchr(logmsg, '\n');
2532 	if (newline)
2533 		*newline = '\0';
2534 
2535 	limit = avail - col;
2536 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2537 		limit--;	/* for the border */
2538 
2539 	/* Prepend reference labels to log message if possible .*/
2540 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2541 	err = build_refs_str(&refs_str, refs, id, s->repo);
2542 	if (err)
2543 		goto done;
2544 	if (refs_str) {
2545 		char *rs;
2546 
2547 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2548 			err = got_error_from_errno("asprintf");
2549 			goto done;
2550 		}
2551 		err = format_line(&wrefstr, &refstr_width,
2552 		    &scrollx, rs, view->x, limit, col, 1);
2553 		free(rs);
2554 		if (err)
2555 			goto done;
2556 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2557 		if (tc)
2558 			wattr_on(view->window,
2559 			    COLOR_PAIR(tc->colorpair), NULL);
2560 		waddwstr(view->window, &wrefstr[scrollx]);
2561 		if (tc)
2562 			wattr_off(view->window,
2563 			    COLOR_PAIR(tc->colorpair), NULL);
2564 		col += MAX(refstr_width, 0);
2565 		if (col > avail)
2566 			goto done;
2567 
2568 		if (col < avail) {
2569 			waddch(view->window, ' ');
2570 			col++;
2571 		}
2572 
2573 		if (refstr_width > 0)
2574 			logmsg_x = 0;
2575 		else {
2576 			int unscrolled_refstr_width;
2577 			size_t len = wcslen(wrefstr);
2578 
2579 			/*
2580 			 * No need to check for -1 return value here since
2581 			 * unprintables have been replaced by span_wline().
2582 			 */
2583 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2584 			unscrolled_refstr_width += 1; /* trailing space */
2585 			logmsg_x = view->x - unscrolled_refstr_width;
2586 		}
2587 
2588 		limit = avail - col;
2589 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2590 			limit--;	/* for the border */
2591 	} else
2592 		logmsg_x = view->x;
2593 
2594 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2595 	    limit, col, 1);
2596 	if (err)
2597 		goto done;
2598 	waddwstr(view->window, &wlogmsg[scrollx]);
2599 	col += MAX(logmsg_width, 0);
2600 	while (col < avail) {
2601 		waddch(view->window, ' ');
2602 		col++;
2603 	}
2604 done:
2605 	free(logmsg0);
2606 	free(wlogmsg);
2607 	free(wrefstr);
2608 	free(refs_str);
2609 	free(author);
2610 	free(wauthor);
2611 	free(line);
2612 	return err;
2613 }
2614 
2615 static struct commit_queue_entry *
2616 alloc_commit_queue_entry(struct got_commit_object *commit,
2617     struct got_object_id *id)
2618 {
2619 	struct commit_queue_entry *entry;
2620 	struct got_object_id *dup;
2621 
2622 	entry = calloc(1, sizeof(*entry));
2623 	if (entry == NULL)
2624 		return NULL;
2625 
2626 	dup = got_object_id_dup(id);
2627 	if (dup == NULL) {
2628 		free(entry);
2629 		return NULL;
2630 	}
2631 
2632 	entry->id = dup;
2633 	entry->commit = commit;
2634 	return entry;
2635 }
2636 
2637 static void
2638 pop_commit(struct commit_queue *commits)
2639 {
2640 	struct commit_queue_entry *entry;
2641 
2642 	entry = TAILQ_FIRST(&commits->head);
2643 	TAILQ_REMOVE(&commits->head, entry, entry);
2644 	got_object_commit_close(entry->commit);
2645 	commits->ncommits--;
2646 	free(entry->id);
2647 	free(entry);
2648 }
2649 
2650 static void
2651 free_commits(struct commit_queue *commits)
2652 {
2653 	while (!TAILQ_EMPTY(&commits->head))
2654 		pop_commit(commits);
2655 }
2656 
2657 static const struct got_error *
2658 match_commit(int *have_match, struct got_object_id *id,
2659     struct got_commit_object *commit, regex_t *regex)
2660 {
2661 	const struct got_error *err = NULL;
2662 	regmatch_t regmatch;
2663 	char *id_str = NULL, *logmsg = NULL;
2664 
2665 	*have_match = 0;
2666 
2667 	err = got_object_id_str(&id_str, id);
2668 	if (err)
2669 		return err;
2670 
2671 	err = got_object_commit_get_logmsg(&logmsg, commit);
2672 	if (err)
2673 		goto done;
2674 
2675 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2676 	    &regmatch, 0) == 0 ||
2677 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2678 	    &regmatch, 0) == 0 ||
2679 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2680 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2681 		*have_match = 1;
2682 done:
2683 	free(id_str);
2684 	free(logmsg);
2685 	return err;
2686 }
2687 
2688 static const struct got_error *
2689 queue_commits(struct tog_log_thread_args *a)
2690 {
2691 	const struct got_error *err = NULL;
2692 
2693 	/*
2694 	 * We keep all commits open throughout the lifetime of the log
2695 	 * view in order to avoid having to re-fetch commits from disk
2696 	 * while updating the display.
2697 	 */
2698 	do {
2699 		struct got_object_id id;
2700 		struct got_commit_object *commit;
2701 		struct commit_queue_entry *entry;
2702 		int limit_match = 0;
2703 		int errcode;
2704 
2705 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2706 		    NULL, NULL);
2707 		if (err)
2708 			break;
2709 
2710 		err = got_object_open_as_commit(&commit, a->repo, &id);
2711 		if (err)
2712 			break;
2713 		entry = alloc_commit_queue_entry(commit, &id);
2714 		if (entry == NULL) {
2715 			err = got_error_from_errno("alloc_commit_queue_entry");
2716 			break;
2717 		}
2718 
2719 		errcode = pthread_mutex_lock(&tog_mutex);
2720 		if (errcode) {
2721 			err = got_error_set_errno(errcode,
2722 			    "pthread_mutex_lock");
2723 			break;
2724 		}
2725 
2726 		entry->idx = a->real_commits->ncommits;
2727 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2728 		a->real_commits->ncommits++;
2729 
2730 		if (*a->limiting) {
2731 			err = match_commit(&limit_match, &id, commit,
2732 			    a->limit_regex);
2733 			if (err)
2734 				break;
2735 
2736 			if (limit_match) {
2737 				struct commit_queue_entry *matched;
2738 
2739 				matched = alloc_commit_queue_entry(
2740 				    entry->commit, entry->id);
2741 				if (matched == NULL) {
2742 					err = got_error_from_errno(
2743 					    "alloc_commit_queue_entry");
2744 					break;
2745 				}
2746 				matched->commit = entry->commit;
2747 				got_object_commit_retain(entry->commit);
2748 
2749 				matched->idx = a->limit_commits->ncommits;
2750 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2751 				    matched, entry);
2752 				a->limit_commits->ncommits++;
2753 			}
2754 
2755 			/*
2756 			 * This is how we signal log_thread() that we
2757 			 * have found a match, and that it should be
2758 			 * counted as a new entry for the view.
2759 			 */
2760 			a->limit_match = limit_match;
2761 		}
2762 
2763 		if (*a->searching == TOG_SEARCH_FORWARD &&
2764 		    !*a->search_next_done) {
2765 			int have_match;
2766 			err = match_commit(&have_match, &id, commit, a->regex);
2767 			if (err)
2768 				break;
2769 
2770 			if (*a->limiting) {
2771 				if (limit_match && have_match)
2772 					*a->search_next_done =
2773 					    TOG_SEARCH_HAVE_MORE;
2774 			} else if (have_match)
2775 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2776 		}
2777 
2778 		errcode = pthread_mutex_unlock(&tog_mutex);
2779 		if (errcode && err == NULL)
2780 			err = got_error_set_errno(errcode,
2781 			    "pthread_mutex_unlock");
2782 		if (err)
2783 			break;
2784 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2785 
2786 	return err;
2787 }
2788 
2789 static void
2790 select_commit(struct tog_log_view_state *s)
2791 {
2792 	struct commit_queue_entry *entry;
2793 	int ncommits = 0;
2794 
2795 	entry = s->first_displayed_entry;
2796 	while (entry) {
2797 		if (ncommits == s->selected) {
2798 			s->selected_entry = entry;
2799 			break;
2800 		}
2801 		entry = TAILQ_NEXT(entry, entry);
2802 		ncommits++;
2803 	}
2804 }
2805 
2806 static const struct got_error *
2807 draw_commits(struct tog_view *view)
2808 {
2809 	const struct got_error *err = NULL;
2810 	struct tog_log_view_state *s = &view->state.log;
2811 	struct commit_queue_entry *entry = s->selected_entry;
2812 	int limit = view->nlines;
2813 	int width;
2814 	int ncommits, author_cols = 4, refstr_cols;
2815 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2816 	char *refs_str = NULL;
2817 	wchar_t *wline;
2818 	struct tog_color *tc;
2819 	static const size_t date_display_cols = 12;
2820 	struct got_reflist_head *refs;
2821 
2822 	if (view_is_hsplit_top(view))
2823 		--limit;  /* account for border */
2824 
2825 	if (s->selected_entry &&
2826 	    !(view->searching && view->search_next_done == 0)) {
2827 		err = got_object_id_str(&id_str, s->selected_entry->id);
2828 		if (err)
2829 			return err;
2830 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2831 		    s->selected_entry->id);
2832 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2833 		    s->repo);
2834 		if (err)
2835 			goto done;
2836 	}
2837 
2838 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2839 		halfdelay(10); /* disable fast refresh */
2840 
2841 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2842 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2843 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2844 		    (view->searching && !view->search_next_done) ?
2845 		    "searching..." : "loading...") == -1) {
2846 			err = got_error_from_errno("asprintf");
2847 			goto done;
2848 		}
2849 	} else {
2850 		const char *search_str = NULL;
2851 		const char *limit_str = NULL;
2852 
2853 		if (view->searching) {
2854 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2855 				search_str = "no more matches";
2856 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2857 				search_str = "no matches found";
2858 			else if (!view->search_next_done)
2859 				search_str = "searching...";
2860 		}
2861 
2862 		if (s->limit_view && s->commits->ncommits == 0)
2863 			limit_str = "no matches found";
2864 
2865 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2866 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2867 		    search_str ? search_str : (refs_str ? refs_str : ""),
2868 		    limit_str ? limit_str : "") == -1) {
2869 			err = got_error_from_errno("asprintf");
2870 			goto done;
2871 		}
2872 	}
2873 
2874 	free(refs_str);
2875 	refs_str = NULL;
2876 
2877 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2878 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2879 		    "........................................",
2880 		    s->in_repo_path, ncommits_str) == -1) {
2881 			err = got_error_from_errno("asprintf");
2882 			header = NULL;
2883 			goto done;
2884 		}
2885 	} else if (asprintf(&header, "commit %s%s",
2886 	    id_str ? id_str : "........................................",
2887 	    ncommits_str) == -1) {
2888 		err = got_error_from_errno("asprintf");
2889 		header = NULL;
2890 		goto done;
2891 	}
2892 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2893 	if (err)
2894 		goto done;
2895 
2896 	werase(view->window);
2897 
2898 	if (view_needs_focus_indication(view))
2899 		wstandout(view->window);
2900 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2901 	if (tc)
2902 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2903 	waddwstr(view->window, wline);
2904 	while (width < view->ncols) {
2905 		waddch(view->window, ' ');
2906 		width++;
2907 	}
2908 	if (tc)
2909 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2910 	if (view_needs_focus_indication(view))
2911 		wstandend(view->window);
2912 	free(wline);
2913 	if (limit <= 1)
2914 		goto done;
2915 
2916 	/* Grow author column size if necessary, and set view->maxx. */
2917 	entry = s->first_displayed_entry;
2918 	ncommits = 0;
2919 	view->maxx = 0;
2920 	while (entry) {
2921 		struct got_commit_object *c = entry->commit;
2922 		char *author, *eol, *msg, *msg0;
2923 		wchar_t *wauthor, *wmsg;
2924 		int width;
2925 		if (ncommits >= limit - 1)
2926 			break;
2927 		if (s->use_committer)
2928 			author = strdup(got_object_commit_get_committer(c));
2929 		else
2930 			author = strdup(got_object_commit_get_author(c));
2931 		if (author == NULL) {
2932 			err = got_error_from_errno("strdup");
2933 			goto done;
2934 		}
2935 		err = format_author(&wauthor, &width, author, COLS,
2936 		    date_display_cols);
2937 		if (author_cols < width)
2938 			author_cols = width;
2939 		free(wauthor);
2940 		free(author);
2941 		if (err)
2942 			goto done;
2943 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2944 		    entry->id);
2945 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2946 		if (err)
2947 			goto done;
2948 		if (refs_str) {
2949 			wchar_t *ws;
2950 			err = format_line(&ws, &width, NULL, refs_str,
2951 			    0, INT_MAX, date_display_cols + author_cols, 0);
2952 			free(ws);
2953 			free(refs_str);
2954 			refs_str = NULL;
2955 			if (err)
2956 				goto done;
2957 			refstr_cols = width + 3; /* account for [ ] + space */
2958 		} else
2959 			refstr_cols = 0;
2960 		err = got_object_commit_get_logmsg(&msg0, c);
2961 		if (err)
2962 			goto done;
2963 		msg = msg0;
2964 		while (*msg == '\n')
2965 			++msg;
2966 		if ((eol = strchr(msg, '\n')))
2967 			*eol = '\0';
2968 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2969 		    date_display_cols + author_cols + refstr_cols, 0);
2970 		if (err)
2971 			goto done;
2972 		view->maxx = MAX(view->maxx, width + refstr_cols);
2973 		free(msg0);
2974 		free(wmsg);
2975 		ncommits++;
2976 		entry = TAILQ_NEXT(entry, entry);
2977 	}
2978 
2979 	entry = s->first_displayed_entry;
2980 	s->last_displayed_entry = s->first_displayed_entry;
2981 	ncommits = 0;
2982 	while (entry) {
2983 		if (ncommits >= limit - 1)
2984 			break;
2985 		if (ncommits == s->selected)
2986 			wstandout(view->window);
2987 		err = draw_commit(view, entry, date_display_cols, author_cols);
2988 		if (ncommits == s->selected)
2989 			wstandend(view->window);
2990 		if (err)
2991 			goto done;
2992 		ncommits++;
2993 		s->last_displayed_entry = entry;
2994 		entry = TAILQ_NEXT(entry, entry);
2995 	}
2996 
2997 	view_border(view);
2998 done:
2999 	free(id_str);
3000 	free(refs_str);
3001 	free(ncommits_str);
3002 	free(header);
3003 	return err;
3004 }
3005 
3006 static void
3007 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
3008 {
3009 	struct commit_queue_entry *entry;
3010 	int nscrolled = 0;
3011 
3012 	entry = TAILQ_FIRST(&s->commits->head);
3013 	if (s->first_displayed_entry == entry)
3014 		return;
3015 
3016 	entry = s->first_displayed_entry;
3017 	while (entry && nscrolled < maxscroll) {
3018 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3019 		if (entry) {
3020 			s->first_displayed_entry = entry;
3021 			nscrolled++;
3022 		}
3023 	}
3024 }
3025 
3026 static const struct got_error *
3027 trigger_log_thread(struct tog_view *view, int wait)
3028 {
3029 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3030 	int errcode;
3031 
3032 	if (!using_mock_io)
3033 		halfdelay(1); /* fast refresh while loading commits */
3034 
3035 	while (!ta->log_complete && !tog_thread_error &&
3036 	    (ta->commits_needed > 0 || ta->load_all)) {
3037 		/* Wake the log thread. */
3038 		errcode = pthread_cond_signal(&ta->need_commits);
3039 		if (errcode)
3040 			return got_error_set_errno(errcode,
3041 			    "pthread_cond_signal");
3042 
3043 		/*
3044 		 * The mutex will be released while the view loop waits
3045 		 * in wgetch(), at which time the log thread will run.
3046 		 */
3047 		if (!wait)
3048 			break;
3049 
3050 		/* Display progress update in log view. */
3051 		show_log_view(view);
3052 		update_panels();
3053 		doupdate();
3054 
3055 		/* Wait right here while next commit is being loaded. */
3056 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3057 		if (errcode)
3058 			return got_error_set_errno(errcode,
3059 			    "pthread_cond_wait");
3060 
3061 		/* Display progress update in log view. */
3062 		show_log_view(view);
3063 		update_panels();
3064 		doupdate();
3065 	}
3066 
3067 	return NULL;
3068 }
3069 
3070 static const struct got_error *
3071 request_log_commits(struct tog_view *view)
3072 {
3073 	struct tog_log_view_state	*state = &view->state.log;
3074 	const struct got_error		*err = NULL;
3075 
3076 	if (state->thread_args.log_complete)
3077 		return NULL;
3078 
3079 	state->thread_args.commits_needed += view->nscrolled;
3080 	err = trigger_log_thread(view, 1);
3081 	view->nscrolled = 0;
3082 
3083 	return err;
3084 }
3085 
3086 static const struct got_error *
3087 log_scroll_down(struct tog_view *view, int maxscroll)
3088 {
3089 	struct tog_log_view_state *s = &view->state.log;
3090 	const struct got_error *err = NULL;
3091 	struct commit_queue_entry *pentry;
3092 	int nscrolled = 0, ncommits_needed;
3093 
3094 	if (s->last_displayed_entry == NULL)
3095 		return NULL;
3096 
3097 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3098 	if (s->commits->ncommits < ncommits_needed &&
3099 	    !s->thread_args.log_complete) {
3100 		/*
3101 		 * Ask the log thread for required amount of commits.
3102 		 */
3103 		s->thread_args.commits_needed +=
3104 		    ncommits_needed - s->commits->ncommits;
3105 		err = trigger_log_thread(view, 1);
3106 		if (err)
3107 			return err;
3108 	}
3109 
3110 	do {
3111 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3112 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3113 			break;
3114 
3115 		s->last_displayed_entry = pentry ?
3116 		    pentry : s->last_displayed_entry;
3117 
3118 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3119 		if (pentry == NULL)
3120 			break;
3121 		s->first_displayed_entry = pentry;
3122 	} while (++nscrolled < maxscroll);
3123 
3124 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3125 		view->nscrolled += nscrolled;
3126 	else
3127 		view->nscrolled = 0;
3128 
3129 	return err;
3130 }
3131 
3132 static const struct got_error *
3133 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3134     struct got_commit_object *commit, struct got_object_id *commit_id,
3135     struct tog_view *log_view, struct got_repository *repo)
3136 {
3137 	const struct got_error *err;
3138 	struct got_object_qid *parent_id;
3139 	struct tog_view *diff_view;
3140 
3141 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3142 	if (diff_view == NULL)
3143 		return got_error_from_errno("view_open");
3144 
3145 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3146 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3147 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3148 	if (err == NULL)
3149 		*new_view = diff_view;
3150 	return err;
3151 }
3152 
3153 static const struct got_error *
3154 tree_view_visit_subtree(struct tog_tree_view_state *s,
3155     struct got_tree_object *subtree)
3156 {
3157 	struct tog_parent_tree *parent;
3158 
3159 	parent = calloc(1, sizeof(*parent));
3160 	if (parent == NULL)
3161 		return got_error_from_errno("calloc");
3162 
3163 	parent->tree = s->tree;
3164 	parent->first_displayed_entry = s->first_displayed_entry;
3165 	parent->selected_entry = s->selected_entry;
3166 	parent->selected = s->selected;
3167 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3168 	s->tree = subtree;
3169 	s->selected = 0;
3170 	s->first_displayed_entry = NULL;
3171 	return NULL;
3172 }
3173 
3174 static const struct got_error *
3175 tree_view_walk_path(struct tog_tree_view_state *s,
3176     struct got_commit_object *commit, const char *path)
3177 {
3178 	const struct got_error *err = NULL;
3179 	struct got_tree_object *tree = NULL;
3180 	const char *p;
3181 	char *slash, *subpath = NULL;
3182 
3183 	/* Walk the path and open corresponding tree objects. */
3184 	p = path;
3185 	while (*p) {
3186 		struct got_tree_entry *te;
3187 		struct got_object_id *tree_id;
3188 		char *te_name;
3189 
3190 		while (p[0] == '/')
3191 			p++;
3192 
3193 		/* Ensure the correct subtree entry is selected. */
3194 		slash = strchr(p, '/');
3195 		if (slash == NULL)
3196 			te_name = strdup(p);
3197 		else
3198 			te_name = strndup(p, slash - p);
3199 		if (te_name == NULL) {
3200 			err = got_error_from_errno("strndup");
3201 			break;
3202 		}
3203 		te = got_object_tree_find_entry(s->tree, te_name);
3204 		if (te == NULL) {
3205 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3206 			free(te_name);
3207 			break;
3208 		}
3209 		free(te_name);
3210 		s->first_displayed_entry = s->selected_entry = te;
3211 
3212 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3213 			break; /* jump to this file's entry */
3214 
3215 		slash = strchr(p, '/');
3216 		if (slash)
3217 			subpath = strndup(path, slash - path);
3218 		else
3219 			subpath = strdup(path);
3220 		if (subpath == NULL) {
3221 			err = got_error_from_errno("strdup");
3222 			break;
3223 		}
3224 
3225 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3226 		    subpath);
3227 		if (err)
3228 			break;
3229 
3230 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3231 		free(tree_id);
3232 		if (err)
3233 			break;
3234 
3235 		err = tree_view_visit_subtree(s, tree);
3236 		if (err) {
3237 			got_object_tree_close(tree);
3238 			break;
3239 		}
3240 		if (slash == NULL)
3241 			break;
3242 		free(subpath);
3243 		subpath = NULL;
3244 		p = slash;
3245 	}
3246 
3247 	free(subpath);
3248 	return err;
3249 }
3250 
3251 static const struct got_error *
3252 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3253     struct commit_queue_entry *entry, const char *path,
3254     const char *head_ref_name, struct got_repository *repo)
3255 {
3256 	const struct got_error *err = NULL;
3257 	struct tog_tree_view_state *s;
3258 	struct tog_view *tree_view;
3259 
3260 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3261 	if (tree_view == NULL)
3262 		return got_error_from_errno("view_open");
3263 
3264 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3265 	if (err)
3266 		return err;
3267 	s = &tree_view->state.tree;
3268 
3269 	*new_view = tree_view;
3270 
3271 	if (got_path_is_root_dir(path))
3272 		return NULL;
3273 
3274 	return tree_view_walk_path(s, entry->commit, path);
3275 }
3276 
3277 static const struct got_error *
3278 block_signals_used_by_main_thread(void)
3279 {
3280 	sigset_t sigset;
3281 	int errcode;
3282 
3283 	if (sigemptyset(&sigset) == -1)
3284 		return got_error_from_errno("sigemptyset");
3285 
3286 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3287 	if (sigaddset(&sigset, SIGWINCH) == -1)
3288 		return got_error_from_errno("sigaddset");
3289 	if (sigaddset(&sigset, SIGCONT) == -1)
3290 		return got_error_from_errno("sigaddset");
3291 	if (sigaddset(&sigset, SIGINT) == -1)
3292 		return got_error_from_errno("sigaddset");
3293 	if (sigaddset(&sigset, SIGTERM) == -1)
3294 		return got_error_from_errno("sigaddset");
3295 
3296 	/* ncurses handles SIGTSTP */
3297 	if (sigaddset(&sigset, SIGTSTP) == -1)
3298 		return got_error_from_errno("sigaddset");
3299 
3300 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3301 	if (errcode)
3302 		return got_error_set_errno(errcode, "pthread_sigmask");
3303 
3304 	return NULL;
3305 }
3306 
3307 static void *
3308 log_thread(void *arg)
3309 {
3310 	const struct got_error *err = NULL;
3311 	int errcode = 0;
3312 	struct tog_log_thread_args *a = arg;
3313 	int done = 0;
3314 
3315 	/*
3316 	 * Sync startup with main thread such that we begin our
3317 	 * work once view_input() has released the mutex.
3318 	 */
3319 	errcode = pthread_mutex_lock(&tog_mutex);
3320 	if (errcode) {
3321 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3322 		return (void *)err;
3323 	}
3324 
3325 	err = block_signals_used_by_main_thread();
3326 	if (err) {
3327 		pthread_mutex_unlock(&tog_mutex);
3328 		goto done;
3329 	}
3330 
3331 	while (!done && !err && !tog_fatal_signal_received()) {
3332 		errcode = pthread_mutex_unlock(&tog_mutex);
3333 		if (errcode) {
3334 			err = got_error_set_errno(errcode,
3335 			    "pthread_mutex_unlock");
3336 			goto done;
3337 		}
3338 		err = queue_commits(a);
3339 		if (err) {
3340 			if (err->code != GOT_ERR_ITER_COMPLETED)
3341 				goto done;
3342 			err = NULL;
3343 			done = 1;
3344 			a->commits_needed = 0;
3345 		} else if (a->commits_needed > 0 && !a->load_all) {
3346 			if (*a->limiting) {
3347 				if (a->limit_match)
3348 					a->commits_needed--;
3349 			} else
3350 				a->commits_needed--;
3351 		}
3352 
3353 		errcode = pthread_mutex_lock(&tog_mutex);
3354 		if (errcode) {
3355 			err = got_error_set_errno(errcode,
3356 			    "pthread_mutex_lock");
3357 			goto done;
3358 		} else if (*a->quit)
3359 			done = 1;
3360 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3361 			*a->first_displayed_entry =
3362 			    TAILQ_FIRST(&a->limit_commits->head);
3363 			*a->selected_entry = *a->first_displayed_entry;
3364 		} else if (*a->first_displayed_entry == NULL) {
3365 			*a->first_displayed_entry =
3366 			    TAILQ_FIRST(&a->real_commits->head);
3367 			*a->selected_entry = *a->first_displayed_entry;
3368 		}
3369 
3370 		errcode = pthread_cond_signal(&a->commit_loaded);
3371 		if (errcode) {
3372 			err = got_error_set_errno(errcode,
3373 			    "pthread_cond_signal");
3374 			pthread_mutex_unlock(&tog_mutex);
3375 			goto done;
3376 		}
3377 
3378 		if (a->commits_needed == 0 &&
3379 		    a->need_commit_marker && a->worktree) {
3380 			errcode = pthread_mutex_unlock(&tog_mutex);
3381 			if (errcode) {
3382 				err = got_error_set_errno(errcode,
3383 				    "pthread_mutex_unlock");
3384 				goto done;
3385 			}
3386 			err = got_worktree_get_state(&tog_base_commit.marker,
3387 			    a->repo, a->worktree, NULL, NULL);
3388 			if (err)
3389 				goto done;
3390 			errcode = pthread_mutex_lock(&tog_mutex);
3391 			if (errcode) {
3392 				err = got_error_set_errno(errcode,
3393 				    "pthread_mutex_lock");
3394 				goto done;
3395 			}
3396 			a->need_commit_marker = 0;
3397 			/*
3398 			 * The main thread did not close this
3399 			 * work tree yet. Close it now.
3400 			 */
3401 			got_worktree_close(a->worktree);
3402 			a->worktree = NULL;
3403 
3404 			if (*a->quit)
3405 				done = 1;
3406 		}
3407 
3408 		if (done)
3409 			a->commits_needed = 0;
3410 		else {
3411 			if (a->commits_needed == 0 && !a->load_all) {
3412 				if (tog_io.wait_for_ui) {
3413 					errcode = pthread_cond_signal(
3414 					    &a->log_loaded);
3415 					if (errcode && err == NULL)
3416 						err = got_error_set_errno(
3417 						    errcode,
3418 						    "pthread_cond_signal");
3419 				}
3420 
3421 				errcode = pthread_cond_wait(&a->need_commits,
3422 				    &tog_mutex);
3423 				if (errcode) {
3424 					err = got_error_set_errno(errcode,
3425 					    "pthread_cond_wait");
3426 					pthread_mutex_unlock(&tog_mutex);
3427 					goto done;
3428 				}
3429 				if (*a->quit)
3430 					done = 1;
3431 			}
3432 		}
3433 	}
3434 	a->log_complete = 1;
3435 	if (tog_io.wait_for_ui) {
3436 		errcode = pthread_cond_signal(&a->log_loaded);
3437 		if (errcode && err == NULL)
3438 			err = got_error_set_errno(errcode,
3439 			    "pthread_cond_signal");
3440 	}
3441 
3442 	errcode = pthread_mutex_unlock(&tog_mutex);
3443 	if (errcode)
3444 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3445 done:
3446 	if (err) {
3447 		tog_thread_error = 1;
3448 		pthread_cond_signal(&a->commit_loaded);
3449 		if (a->worktree) {
3450 			got_worktree_close(a->worktree);
3451 			a->worktree = NULL;
3452 		}
3453 	}
3454 	return (void *)err;
3455 }
3456 
3457 static const struct got_error *
3458 stop_log_thread(struct tog_log_view_state *s)
3459 {
3460 	const struct got_error *err = NULL, *thread_err = NULL;
3461 	int errcode;
3462 
3463 	if (s->thread) {
3464 		s->quit = 1;
3465 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3466 		if (errcode)
3467 			return got_error_set_errno(errcode,
3468 			    "pthread_cond_signal");
3469 		errcode = pthread_mutex_unlock(&tog_mutex);
3470 		if (errcode)
3471 			return got_error_set_errno(errcode,
3472 			    "pthread_mutex_unlock");
3473 		errcode = pthread_join(s->thread, (void **)&thread_err);
3474 		if (errcode)
3475 			return got_error_set_errno(errcode, "pthread_join");
3476 		errcode = pthread_mutex_lock(&tog_mutex);
3477 		if (errcode)
3478 			return got_error_set_errno(errcode,
3479 			    "pthread_mutex_lock");
3480 		s->thread = 0; //NULL;
3481 	}
3482 
3483 	if (s->thread_args.repo) {
3484 		err = got_repo_close(s->thread_args.repo);
3485 		s->thread_args.repo = NULL;
3486 	}
3487 
3488 	if (s->thread_args.pack_fds) {
3489 		const struct got_error *pack_err =
3490 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3491 		if (err == NULL)
3492 			err = pack_err;
3493 		s->thread_args.pack_fds = NULL;
3494 	}
3495 
3496 	if (s->thread_args.graph) {
3497 		got_commit_graph_close(s->thread_args.graph);
3498 		s->thread_args.graph = NULL;
3499 	}
3500 
3501 	return err ? err : thread_err;
3502 }
3503 
3504 static const struct got_error *
3505 close_log_view(struct tog_view *view)
3506 {
3507 	const struct got_error *err = NULL;
3508 	struct tog_log_view_state *s = &view->state.log;
3509 	int errcode;
3510 
3511 	err = stop_log_thread(s);
3512 
3513 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3514 	if (errcode && err == NULL)
3515 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3516 
3517 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3518 	if (errcode && err == NULL)
3519 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3520 
3521 	free_commits(&s->limit_commits);
3522 	free_commits(&s->real_commits);
3523 	free(s->in_repo_path);
3524 	s->in_repo_path = NULL;
3525 	free(s->start_id);
3526 	s->start_id = NULL;
3527 	free(s->head_ref_name);
3528 	s->head_ref_name = NULL;
3529 	return err;
3530 }
3531 
3532 /*
3533  * We use two queues to implement the limit feature: first consists of
3534  * commits matching the current limit_regex; second is the real queue
3535  * of all known commits (real_commits). When the user starts limiting,
3536  * we swap queues such that all movement and displaying functionality
3537  * works with very slight change.
3538  */
3539 static const struct got_error *
3540 limit_log_view(struct tog_view *view)
3541 {
3542 	struct tog_log_view_state *s = &view->state.log;
3543 	struct commit_queue_entry *entry;
3544 	struct tog_view	*v = view;
3545 	const struct got_error *err = NULL;
3546 	char pattern[1024];
3547 	int ret;
3548 
3549 	if (view_is_hsplit_top(view))
3550 		v = view->child;
3551 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3552 		v = view->parent;
3553 
3554 	/* Get the pattern */
3555 	wmove(v->window, v->nlines - 1, 0);
3556 	wclrtoeol(v->window);
3557 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3558 	nodelay(v->window, FALSE);
3559 	nocbreak();
3560 	echo();
3561 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3562 	cbreak();
3563 	noecho();
3564 	nodelay(v->window, TRUE);
3565 	if (ret == ERR)
3566 		return NULL;
3567 
3568 	if (*pattern == '\0') {
3569 		/*
3570 		 * Safety measure for the situation where the user
3571 		 * resets limit without previously limiting anything.
3572 		 */
3573 		if (!s->limit_view)
3574 			return NULL;
3575 
3576 		/*
3577 		 * User could have pressed Ctrl+L, which refreshed the
3578 		 * commit queues, it means we can't save previously
3579 		 * (before limit took place) displayed entries,
3580 		 * because they would point to already free'ed memory,
3581 		 * so we are forced to always select first entry of
3582 		 * the queue.
3583 		 */
3584 		s->commits = &s->real_commits;
3585 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3586 		s->selected_entry = s->first_displayed_entry;
3587 		s->selected = 0;
3588 		s->limit_view = 0;
3589 
3590 		return NULL;
3591 	}
3592 
3593 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3594 		return NULL;
3595 
3596 	s->limit_view = 1;
3597 
3598 	/* Clear the screen while loading limit view */
3599 	s->first_displayed_entry = NULL;
3600 	s->last_displayed_entry = NULL;
3601 	s->selected_entry = NULL;
3602 	s->commits = &s->limit_commits;
3603 
3604 	/* Prepare limit queue for new search */
3605 	free_commits(&s->limit_commits);
3606 	s->limit_commits.ncommits = 0;
3607 
3608 	/* First process commits, which are in queue already */
3609 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3610 		int have_match = 0;
3611 
3612 		err = match_commit(&have_match, entry->id,
3613 		    entry->commit, &s->limit_regex);
3614 		if (err)
3615 			return err;
3616 
3617 		if (have_match) {
3618 			struct commit_queue_entry *matched;
3619 
3620 			matched = alloc_commit_queue_entry(entry->commit,
3621 			    entry->id);
3622 			if (matched == NULL) {
3623 				err = got_error_from_errno(
3624 				    "alloc_commit_queue_entry");
3625 				break;
3626 			}
3627 			matched->commit = entry->commit;
3628 			got_object_commit_retain(entry->commit);
3629 
3630 			matched->idx = s->limit_commits.ncommits;
3631 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3632 			    matched, entry);
3633 			s->limit_commits.ncommits++;
3634 		}
3635 	}
3636 
3637 	/* Second process all the commits, until we fill the screen */
3638 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3639 	    !s->thread_args.log_complete) {
3640 		s->thread_args.commits_needed +=
3641 		    view->nlines - s->limit_commits.ncommits - 1;
3642 		err = trigger_log_thread(view, 1);
3643 		if (err)
3644 			return err;
3645 	}
3646 
3647 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3648 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3649 	s->selected = 0;
3650 
3651 	return NULL;
3652 }
3653 
3654 static const struct got_error *
3655 search_start_log_view(struct tog_view *view)
3656 {
3657 	struct tog_log_view_state *s = &view->state.log;
3658 
3659 	s->matched_entry = NULL;
3660 	s->search_entry = NULL;
3661 	return NULL;
3662 }
3663 
3664 static const struct got_error *
3665 search_next_log_view(struct tog_view *view)
3666 {
3667 	const struct got_error *err = NULL;
3668 	struct tog_log_view_state *s = &view->state.log;
3669 	struct commit_queue_entry *entry;
3670 
3671 	/* Display progress update in log view. */
3672 	show_log_view(view);
3673 	update_panels();
3674 	doupdate();
3675 
3676 	if (s->search_entry) {
3677 		int errcode, ch;
3678 		errcode = pthread_mutex_unlock(&tog_mutex);
3679 		if (errcode)
3680 			return got_error_set_errno(errcode,
3681 			    "pthread_mutex_unlock");
3682 		ch = wgetch(view->window);
3683 		errcode = pthread_mutex_lock(&tog_mutex);
3684 		if (errcode)
3685 			return got_error_set_errno(errcode,
3686 			    "pthread_mutex_lock");
3687 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3688 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3689 			return NULL;
3690 		}
3691 		if (view->searching == TOG_SEARCH_FORWARD)
3692 			entry = TAILQ_NEXT(s->search_entry, entry);
3693 		else
3694 			entry = TAILQ_PREV(s->search_entry,
3695 			    commit_queue_head, entry);
3696 	} else if (s->matched_entry) {
3697 		/*
3698 		 * If the user has moved the cursor after we hit a match,
3699 		 * the position from where we should continue searching
3700 		 * might have changed.
3701 		 */
3702 		if (view->searching == TOG_SEARCH_FORWARD)
3703 			entry = TAILQ_NEXT(s->selected_entry, entry);
3704 		else
3705 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3706 			    entry);
3707 	} else {
3708 		entry = s->selected_entry;
3709 	}
3710 
3711 	while (1) {
3712 		int have_match = 0;
3713 
3714 		if (entry == NULL) {
3715 			if (s->thread_args.log_complete ||
3716 			    view->searching == TOG_SEARCH_BACKWARD) {
3717 				view->search_next_done =
3718 				    (s->matched_entry == NULL ?
3719 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3720 				s->search_entry = NULL;
3721 				return NULL;
3722 			}
3723 			/*
3724 			 * Poke the log thread for more commits and return,
3725 			 * allowing the main loop to make progress. Search
3726 			 * will resume at s->search_entry once we come back.
3727 			 */
3728 			s->search_entry = s->selected_entry;
3729 			s->thread_args.commits_needed++;
3730 			return trigger_log_thread(view, 0);
3731 		}
3732 
3733 		err = match_commit(&have_match, entry->id, entry->commit,
3734 		    &view->regex);
3735 		if (err)
3736 			break;
3737 		if (have_match) {
3738 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3739 			s->matched_entry = entry;
3740 			break;
3741 		}
3742 
3743 		s->search_entry = entry;
3744 		if (view->searching == TOG_SEARCH_FORWARD)
3745 			entry = TAILQ_NEXT(entry, entry);
3746 		else
3747 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3748 	}
3749 
3750 	if (s->matched_entry) {
3751 		int cur = s->selected_entry->idx;
3752 		while (cur < s->matched_entry->idx) {
3753 			err = input_log_view(NULL, view, KEY_DOWN);
3754 			if (err)
3755 				return err;
3756 			cur++;
3757 		}
3758 		while (cur > s->matched_entry->idx) {
3759 			err = input_log_view(NULL, view, KEY_UP);
3760 			if (err)
3761 				return err;
3762 			cur--;
3763 		}
3764 	}
3765 
3766 	s->search_entry = NULL;
3767 
3768 	return NULL;
3769 }
3770 
3771 static const struct got_error *
3772 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3773     struct got_repository *repo, const char *head_ref_name,
3774     const char *in_repo_path, int log_branches,
3775     struct got_worktree *worktree)
3776 {
3777 	const struct got_error *err = NULL;
3778 	struct tog_log_view_state *s = &view->state.log;
3779 	struct got_repository *thread_repo = NULL;
3780 	struct got_commit_graph *thread_graph = NULL;
3781 	int errcode;
3782 
3783 	if (in_repo_path != s->in_repo_path) {
3784 		free(s->in_repo_path);
3785 		s->in_repo_path = strdup(in_repo_path);
3786 		if (s->in_repo_path == NULL) {
3787 			err = got_error_from_errno("strdup");
3788 			goto done;
3789 		}
3790 	}
3791 
3792 	/* The commit queue only contains commits being displayed. */
3793 	TAILQ_INIT(&s->real_commits.head);
3794 	s->real_commits.ncommits = 0;
3795 	s->commits = &s->real_commits;
3796 
3797 	TAILQ_INIT(&s->limit_commits.head);
3798 	s->limit_view = 0;
3799 	s->limit_commits.ncommits = 0;
3800 
3801 	s->repo = repo;
3802 	if (head_ref_name) {
3803 		s->head_ref_name = strdup(head_ref_name);
3804 		if (s->head_ref_name == NULL) {
3805 			err = got_error_from_errno("strdup");
3806 			goto done;
3807 		}
3808 	}
3809 	s->start_id = got_object_id_dup(start_id);
3810 	if (s->start_id == NULL) {
3811 		err = got_error_from_errno("got_object_id_dup");
3812 		goto done;
3813 	}
3814 	s->log_branches = log_branches;
3815 	s->use_committer = 1;
3816 
3817 	STAILQ_INIT(&s->colors);
3818 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3819 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3820 		    get_color_value("TOG_COLOR_COMMIT"));
3821 		if (err)
3822 			goto done;
3823 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3824 		    get_color_value("TOG_COLOR_AUTHOR"));
3825 		if (err) {
3826 			free_colors(&s->colors);
3827 			goto done;
3828 		}
3829 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3830 		    get_color_value("TOG_COLOR_DATE"));
3831 		if (err) {
3832 			free_colors(&s->colors);
3833 			goto done;
3834 		}
3835 	}
3836 
3837 	view->show = show_log_view;
3838 	view->input = input_log_view;
3839 	view->resize = resize_log_view;
3840 	view->close = close_log_view;
3841 	view->search_start = search_start_log_view;
3842 	view->search_next = search_next_log_view;
3843 
3844 	if (s->thread_args.pack_fds == NULL) {
3845 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3846 		if (err)
3847 			goto done;
3848 	}
3849 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3850 	    s->thread_args.pack_fds);
3851 	if (err)
3852 		goto done;
3853 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3854 	    !s->log_branches);
3855 	if (err)
3856 		goto done;
3857 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3858 	    s->repo, NULL, NULL);
3859 	if (err)
3860 		goto done;
3861 
3862 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3863 	if (errcode) {
3864 		err = got_error_set_errno(errcode, "pthread_cond_init");
3865 		goto done;
3866 	}
3867 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3868 	if (errcode) {
3869 		err = got_error_set_errno(errcode, "pthread_cond_init");
3870 		goto done;
3871 	}
3872 
3873 	if (using_mock_io) {
3874 		int rc;
3875 
3876 		rc = pthread_cond_init(&s->thread_args.log_loaded, NULL);
3877 		if (rc)
3878 			return got_error_set_errno(rc, "pthread_cond_init");
3879 	}
3880 
3881 	s->thread_args.commits_needed = view->nlines;
3882 	s->thread_args.graph = thread_graph;
3883 	s->thread_args.real_commits = &s->real_commits;
3884 	s->thread_args.limit_commits = &s->limit_commits;
3885 	s->thread_args.in_repo_path = s->in_repo_path;
3886 	s->thread_args.start_id = s->start_id;
3887 	s->thread_args.repo = thread_repo;
3888 	s->thread_args.log_complete = 0;
3889 	s->thread_args.quit = &s->quit;
3890 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3891 	s->thread_args.selected_entry = &s->selected_entry;
3892 	s->thread_args.searching = &view->searching;
3893 	s->thread_args.search_next_done = &view->search_next_done;
3894 	s->thread_args.regex = &view->regex;
3895 	s->thread_args.limiting = &s->limit_view;
3896 	s->thread_args.limit_regex = &s->limit_regex;
3897 	s->thread_args.limit_commits = &s->limit_commits;
3898 	s->thread_args.worktree = worktree;
3899 	if (worktree)
3900 		s->thread_args.need_commit_marker = 1;
3901 done:
3902 	if (err) {
3903 		if (view->close == NULL)
3904 			close_log_view(view);
3905 		view_close(view);
3906 	}
3907 	return err;
3908 }
3909 
3910 static const struct got_error *
3911 show_log_view(struct tog_view *view)
3912 {
3913 	const struct got_error *err;
3914 	struct tog_log_view_state *s = &view->state.log;
3915 
3916 	if (s->thread == 0) { //NULL) {
3917 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3918 		    &s->thread_args);
3919 		if (errcode)
3920 			return got_error_set_errno(errcode, "pthread_create");
3921 		if (s->thread_args.commits_needed > 0) {
3922 			err = trigger_log_thread(view, 1);
3923 			if (err)
3924 				return err;
3925 		}
3926 	}
3927 
3928 	return draw_commits(view);
3929 }
3930 
3931 static void
3932 log_move_cursor_up(struct tog_view *view, int page, int home)
3933 {
3934 	struct tog_log_view_state *s = &view->state.log;
3935 
3936 	if (s->first_displayed_entry == NULL)
3937 		return;
3938 	if (s->selected_entry->idx == 0)
3939 		view->count = 0;
3940 
3941 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3942 	    || home)
3943 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3944 
3945 	if (!page && !home && s->selected > 0)
3946 		--s->selected;
3947 	else
3948 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3949 
3950 	select_commit(s);
3951 	return;
3952 }
3953 
3954 static const struct got_error *
3955 log_move_cursor_down(struct tog_view *view, int page)
3956 {
3957 	struct tog_log_view_state	*s = &view->state.log;
3958 	const struct got_error		*err = NULL;
3959 	int				 eos = view->nlines - 2;
3960 
3961 	if (s->first_displayed_entry == NULL)
3962 		return NULL;
3963 
3964 	if (s->thread_args.log_complete &&
3965 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3966 		return NULL;
3967 
3968 	if (view_is_hsplit_top(view))
3969 		--eos;  /* border consumes the last line */
3970 
3971 	if (!page) {
3972 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3973 			++s->selected;
3974 		else
3975 			err = log_scroll_down(view, 1);
3976 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3977 		struct commit_queue_entry *entry;
3978 		int n;
3979 
3980 		s->selected = 0;
3981 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3982 		s->last_displayed_entry = entry;
3983 		for (n = 0; n <= eos; n++) {
3984 			if (entry == NULL)
3985 				break;
3986 			s->first_displayed_entry = entry;
3987 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3988 		}
3989 		if (n > 0)
3990 			s->selected = n - 1;
3991 	} else {
3992 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3993 		    s->thread_args.log_complete)
3994 			s->selected += MIN(page,
3995 			    s->commits->ncommits - s->selected_entry->idx - 1);
3996 		else
3997 			err = log_scroll_down(view, page);
3998 	}
3999 	if (err)
4000 		return err;
4001 
4002 	/*
4003 	 * We might necessarily overshoot in horizontal
4004 	 * splits; if so, select the last displayed commit.
4005 	 */
4006 	if (s->first_displayed_entry && s->last_displayed_entry) {
4007 		s->selected = MIN(s->selected,
4008 		    s->last_displayed_entry->idx -
4009 		    s->first_displayed_entry->idx);
4010 	}
4011 
4012 	select_commit(s);
4013 
4014 	if (s->thread_args.log_complete &&
4015 	    s->selected_entry->idx == s->commits->ncommits - 1)
4016 		view->count = 0;
4017 
4018 	return NULL;
4019 }
4020 
4021 static void
4022 view_get_split(struct tog_view *view, int *y, int *x)
4023 {
4024 	*x = 0;
4025 	*y = 0;
4026 
4027 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
4028 		if (view->child && view->child->resized_y)
4029 			*y = view->child->resized_y;
4030 		else if (view->resized_y)
4031 			*y = view->resized_y;
4032 		else
4033 			*y = view_split_begin_y(view->lines);
4034 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
4035 		if (view->child && view->child->resized_x)
4036 			*x = view->child->resized_x;
4037 		else if (view->resized_x)
4038 			*x = view->resized_x;
4039 		else
4040 			*x = view_split_begin_x(view->begin_x);
4041 	}
4042 }
4043 
4044 /* Split view horizontally at y and offset view->state->selected line. */
4045 static const struct got_error *
4046 view_init_hsplit(struct tog_view *view, int y)
4047 {
4048 	const struct got_error *err = NULL;
4049 
4050 	view->nlines = y;
4051 	view->ncols = COLS;
4052 	err = view_resize(view);
4053 	if (err)
4054 		return err;
4055 
4056 	err = offset_selection_down(view);
4057 
4058 	return err;
4059 }
4060 
4061 static const struct got_error *
4062 log_goto_line(struct tog_view *view, int nlines)
4063 {
4064 	const struct got_error		*err = NULL;
4065 	struct tog_log_view_state	*s = &view->state.log;
4066 	int				 g, idx = s->selected_entry->idx;
4067 
4068 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
4069 		return NULL;
4070 
4071 	g = view->gline;
4072 	view->gline = 0;
4073 
4074 	if (g >= s->first_displayed_entry->idx + 1 &&
4075 	    g <= s->last_displayed_entry->idx + 1 &&
4076 	    g - s->first_displayed_entry->idx - 1 < nlines) {
4077 		s->selected = g - s->first_displayed_entry->idx - 1;
4078 		select_commit(s);
4079 		return NULL;
4080 	}
4081 
4082 	if (idx + 1 < g) {
4083 		err = log_move_cursor_down(view, g - idx - 1);
4084 		if (!err && g > s->selected_entry->idx + 1)
4085 			err = log_move_cursor_down(view,
4086 			    g - s->first_displayed_entry->idx - 1);
4087 		if (err)
4088 			return err;
4089 	} else if (idx + 1 > g)
4090 		log_move_cursor_up(view, idx - g + 1, 0);
4091 
4092 	if (g < nlines && s->first_displayed_entry->idx == 0)
4093 		s->selected = g - 1;
4094 
4095 	select_commit(s);
4096 	return NULL;
4097 
4098 }
4099 
4100 static void
4101 horizontal_scroll_input(struct tog_view *view, int ch)
4102 {
4103 
4104 	switch (ch) {
4105 	case KEY_LEFT:
4106 	case 'h':
4107 		view->x -= MIN(view->x, 2);
4108 		if (view->x <= 0)
4109 			view->count = 0;
4110 		break;
4111 	case KEY_RIGHT:
4112 	case 'l':
4113 		if (view->x + view->ncols / 2 < view->maxx)
4114 			view->x += 2;
4115 		else
4116 			view->count = 0;
4117 		break;
4118 	case '0':
4119 		view->x = 0;
4120 		break;
4121 	case '$':
4122 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4123 		view->count = 0;
4124 		break;
4125 	default:
4126 		break;
4127 	}
4128 }
4129 
4130 static const struct got_error *
4131 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4132 {
4133 	const struct got_error *err = NULL;
4134 	struct tog_log_view_state *s = &view->state.log;
4135 	int eos, nscroll;
4136 
4137 	if (s->thread_args.load_all) {
4138 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4139 			s->thread_args.load_all = 0;
4140 		else if (s->thread_args.log_complete) {
4141 			err = log_move_cursor_down(view, s->commits->ncommits);
4142 			s->thread_args.load_all = 0;
4143 		}
4144 		if (err)
4145 			return err;
4146 	}
4147 
4148 	eos = nscroll = view->nlines - 1;
4149 	if (view_is_hsplit_top(view))
4150 		--eos;  /* border */
4151 
4152 	if (view->gline)
4153 		return log_goto_line(view, eos);
4154 
4155 	switch (ch) {
4156 	case '&':
4157 		err = limit_log_view(view);
4158 		break;
4159 	case 'q':
4160 		s->quit = 1;
4161 		break;
4162 	case '0':
4163 	case '$':
4164 	case KEY_RIGHT:
4165 	case 'l':
4166 	case KEY_LEFT:
4167 	case 'h':
4168 		horizontal_scroll_input(view, ch);
4169 		break;
4170 	case 'k':
4171 	case KEY_UP:
4172 	case '<':
4173 	case ',':
4174 	case CTRL('p'):
4175 		log_move_cursor_up(view, 0, 0);
4176 		break;
4177 	case 'g':
4178 	case '=':
4179 	case KEY_HOME:
4180 		log_move_cursor_up(view, 0, 1);
4181 		view->count = 0;
4182 		break;
4183 	case CTRL('u'):
4184 	case 'u':
4185 		nscroll /= 2;
4186 		/* FALL THROUGH */
4187 	case KEY_PPAGE:
4188 	case CTRL('b'):
4189 	case 'b':
4190 		log_move_cursor_up(view, nscroll, 0);
4191 		break;
4192 	case 'j':
4193 	case KEY_DOWN:
4194 	case '>':
4195 	case '.':
4196 	case CTRL('n'):
4197 		err = log_move_cursor_down(view, 0);
4198 		break;
4199 	case '@':
4200 		s->use_committer = !s->use_committer;
4201 		view->action = s->use_committer ?
4202 		    "show committer" : "show commit author";
4203 		break;
4204 	case 'G':
4205 	case '*':
4206 	case KEY_END: {
4207 		/* We don't know yet how many commits, so we're forced to
4208 		 * traverse them all. */
4209 		view->count = 0;
4210 		s->thread_args.load_all = 1;
4211 		if (!s->thread_args.log_complete)
4212 			return trigger_log_thread(view, 0);
4213 		err = log_move_cursor_down(view, s->commits->ncommits);
4214 		s->thread_args.load_all = 0;
4215 		break;
4216 	}
4217 	case CTRL('d'):
4218 	case 'd':
4219 		nscroll /= 2;
4220 		/* FALL THROUGH */
4221 	case KEY_NPAGE:
4222 	case CTRL('f'):
4223 	case 'f':
4224 	case ' ':
4225 		err = log_move_cursor_down(view, nscroll);
4226 		break;
4227 	case KEY_RESIZE:
4228 		if (s->selected > view->nlines - 2)
4229 			s->selected = view->nlines - 2;
4230 		if (s->selected > s->commits->ncommits - 1)
4231 			s->selected = s->commits->ncommits - 1;
4232 		select_commit(s);
4233 		if (s->commits->ncommits < view->nlines - 1 &&
4234 		    !s->thread_args.log_complete) {
4235 			s->thread_args.commits_needed += (view->nlines - 1) -
4236 			    s->commits->ncommits;
4237 			err = trigger_log_thread(view, 1);
4238 		}
4239 		break;
4240 	case KEY_ENTER:
4241 	case '\r':
4242 		view->count = 0;
4243 		if (s->selected_entry == NULL)
4244 			break;
4245 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4246 		break;
4247 	case 'T':
4248 		view->count = 0;
4249 		if (s->selected_entry == NULL)
4250 			break;
4251 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4252 		break;
4253 	case KEY_BACKSPACE:
4254 	case CTRL('l'):
4255 	case 'B':
4256 		view->count = 0;
4257 		if (ch == KEY_BACKSPACE &&
4258 		    got_path_is_root_dir(s->in_repo_path))
4259 			break;
4260 		err = stop_log_thread(s);
4261 		if (err)
4262 			return err;
4263 		if (ch == KEY_BACKSPACE) {
4264 			char *parent_path;
4265 			err = got_path_dirname(&parent_path, s->in_repo_path);
4266 			if (err)
4267 				return err;
4268 			free(s->in_repo_path);
4269 			s->in_repo_path = parent_path;
4270 			s->thread_args.in_repo_path = s->in_repo_path;
4271 		} else if (ch == CTRL('l')) {
4272 			struct got_object_id *start_id;
4273 			err = got_repo_match_object_id(&start_id, NULL,
4274 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4275 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4276 			if (err) {
4277 				if (s->head_ref_name == NULL ||
4278 				    err->code != GOT_ERR_NOT_REF)
4279 					return err;
4280 				/* Try to cope with deleted references. */
4281 				free(s->head_ref_name);
4282 				s->head_ref_name = NULL;
4283 				err = got_repo_match_object_id(&start_id,
4284 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4285 				    &tog_refs, s->repo);
4286 				if (err)
4287 					return err;
4288 			}
4289 			free(s->start_id);
4290 			s->start_id = start_id;
4291 			s->thread_args.start_id = s->start_id;
4292 		} else /* 'B' */
4293 			s->log_branches = !s->log_branches;
4294 
4295 		if (s->thread_args.pack_fds == NULL) {
4296 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4297 			if (err)
4298 				return err;
4299 		}
4300 		err = got_repo_open(&s->thread_args.repo,
4301 		    got_repo_get_path(s->repo), NULL,
4302 		    s->thread_args.pack_fds);
4303 		if (err)
4304 			return err;
4305 		tog_free_refs();
4306 		err = tog_load_refs(s->repo, 0);
4307 		if (err)
4308 			return err;
4309 		err = got_commit_graph_open(&s->thread_args.graph,
4310 		    s->in_repo_path, !s->log_branches);
4311 		if (err)
4312 			return err;
4313 		err = got_commit_graph_iter_start(s->thread_args.graph,
4314 		    s->start_id, s->repo, NULL, NULL);
4315 		if (err)
4316 			return err;
4317 		free_commits(&s->real_commits);
4318 		free_commits(&s->limit_commits);
4319 		s->first_displayed_entry = NULL;
4320 		s->last_displayed_entry = NULL;
4321 		s->selected_entry = NULL;
4322 		s->selected = 0;
4323 		s->thread_args.log_complete = 0;
4324 		s->quit = 0;
4325 		s->thread_args.commits_needed = view->lines;
4326 		s->matched_entry = NULL;
4327 		s->search_entry = NULL;
4328 		view->offset = 0;
4329 		break;
4330 	case 'R':
4331 		view->count = 0;
4332 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4333 		break;
4334 	default:
4335 		view->count = 0;
4336 		break;
4337 	}
4338 
4339 	return err;
4340 }
4341 
4342 static const struct got_error *
4343 apply_unveil(const char *repo_path, const char *worktree_path)
4344 {
4345 	const struct got_error *error;
4346 
4347 #ifdef PROFILE
4348 	if (unveil("gmon.out", "rwc") != 0)
4349 		return got_error_from_errno2("unveil", "gmon.out");
4350 #endif
4351 	if (repo_path && unveil(repo_path, "r") != 0)
4352 		return got_error_from_errno2("unveil", repo_path);
4353 
4354 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4355 		return got_error_from_errno2("unveil", worktree_path);
4356 
4357 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4358 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4359 
4360 	error = got_privsep_unveil_exec_helpers();
4361 	if (error != NULL)
4362 		return error;
4363 
4364 	if (unveil(NULL, NULL) != 0)
4365 		return got_error_from_errno("unveil");
4366 
4367 	return NULL;
4368 }
4369 
4370 static const struct got_error *
4371 init_mock_term(const char *test_script_path)
4372 {
4373 	const struct got_error	*err = NULL;
4374 	const char *screen_dump_path;
4375 	int in;
4376 
4377 	if (test_script_path == NULL || *test_script_path == '\0')
4378 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4379 
4380 	tog_io.f = fopen(test_script_path, "re");
4381 	if (tog_io.f == NULL) {
4382 		err = got_error_from_errno_fmt("fopen: %s",
4383 		    test_script_path);
4384 		goto done;
4385 	}
4386 
4387 	/* test mode, we don't want any output */
4388 	tog_io.cout = fopen("/dev/null", "w+");
4389 	if (tog_io.cout == NULL) {
4390 		err = got_error_from_errno2("fopen", "/dev/null");
4391 		goto done;
4392 	}
4393 
4394 	in = dup(fileno(tog_io.cout));
4395 	if (in == -1) {
4396 		err = got_error_from_errno("dup");
4397 		goto done;
4398 	}
4399 	tog_io.cin = fdopen(in, "r");
4400 	if (tog_io.cin == NULL) {
4401 		err = got_error_from_errno("fdopen");
4402 		close(in);
4403 		goto done;
4404 	}
4405 
4406 	screen_dump_path = getenv("TOG_SCR_DUMP");
4407 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4408 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4409 	tog_io.sdump = fopen(screen_dump_path, "we");
4410 	if (tog_io.sdump == NULL) {
4411 		err = got_error_from_errno2("fopen", screen_dump_path);
4412 		goto done;
4413 	}
4414 
4415 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4416 		err = got_error_from_errno("fseeko");
4417 		goto done;
4418 	}
4419 
4420 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4421 		err = got_error_msg(GOT_ERR_IO,
4422 		    "newterm: failed to initialise curses");
4423 
4424 	using_mock_io = 1;
4425 
4426 done:
4427 	if (err)
4428 		tog_io_close();
4429 	return err;
4430 }
4431 
4432 static void
4433 init_curses(void)
4434 {
4435 	if (using_mock_io) /* In test mode we use a fake terminal */
4436 		return;
4437 
4438 	initscr();
4439 
4440 	cbreak();
4441 	halfdelay(1); /* Fast refresh while initial view is loading. */
4442 	noecho();
4443 	nonl();
4444 	intrflush(stdscr, FALSE);
4445 	keypad(stdscr, TRUE);
4446 	curs_set(0);
4447 	if (getenv("TOG_COLORS") != NULL) {
4448 		start_color();
4449 		use_default_colors();
4450 	}
4451 
4452 	return;
4453 }
4454 
4455 static const struct got_error *
4456 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4457 {
4458 	tog_base_commit.id = got_object_id_dup(
4459 	    got_worktree_get_base_commit_id(worktree));
4460 	if (tog_base_commit.id == NULL)
4461 		return got_error_from_errno( "got_object_id_dup");
4462 
4463 	return NULL;
4464 }
4465 
4466 static const struct got_error *
4467 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4468     struct got_repository *repo, struct got_worktree *worktree)
4469 {
4470 	const struct got_error *err = NULL;
4471 
4472 	if (argc == 0) {
4473 		*in_repo_path = strdup("/");
4474 		if (*in_repo_path == NULL)
4475 			return got_error_from_errno("strdup");
4476 		return NULL;
4477 	}
4478 
4479 	if (worktree) {
4480 		const char *prefix = got_worktree_get_path_prefix(worktree);
4481 		char *p;
4482 
4483 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4484 		if (err)
4485 			return err;
4486 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4487 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4488 		    p) == -1) {
4489 			err = got_error_from_errno("asprintf");
4490 			*in_repo_path = NULL;
4491 		}
4492 		free(p);
4493 	} else
4494 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4495 
4496 	return err;
4497 }
4498 
4499 static const struct got_error *
4500 cmd_log(int argc, char *argv[])
4501 {
4502 	const struct got_error *error;
4503 	struct got_repository *repo = NULL;
4504 	struct got_worktree *worktree = NULL;
4505 	struct got_object_id *start_id = NULL;
4506 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4507 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4508 	struct got_reference *ref = NULL;
4509 	const char *head_ref_name = NULL;
4510 	int ch, log_branches = 0;
4511 	struct tog_view *view;
4512 	int *pack_fds = NULL;
4513 
4514 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4515 		switch (ch) {
4516 		case 'b':
4517 			log_branches = 1;
4518 			break;
4519 		case 'c':
4520 			start_commit = optarg;
4521 			break;
4522 		case 'r':
4523 			repo_path = realpath(optarg, NULL);
4524 			if (repo_path == NULL)
4525 				return got_error_from_errno2("realpath",
4526 				    optarg);
4527 			break;
4528 		default:
4529 			usage_log();
4530 			/* NOTREACHED */
4531 		}
4532 	}
4533 
4534 	argc -= optind;
4535 	argv += optind;
4536 
4537 	if (argc > 1)
4538 		usage_log();
4539 
4540 	error = got_repo_pack_fds_open(&pack_fds);
4541 	if (error != NULL)
4542 		goto done;
4543 
4544 	if (repo_path == NULL) {
4545 		cwd = getcwd(NULL, 0);
4546 		if (cwd == NULL) {
4547 			error = got_error_from_errno("getcwd");
4548 			goto done;
4549 		}
4550 		error = got_worktree_open(&worktree, cwd, NULL);
4551 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4552 			goto done;
4553 		if (worktree)
4554 			repo_path =
4555 			    strdup(got_worktree_get_repo_path(worktree));
4556 		else
4557 			repo_path = strdup(cwd);
4558 		if (repo_path == NULL) {
4559 			error = got_error_from_errno("strdup");
4560 			goto done;
4561 		}
4562 	}
4563 
4564 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4565 	if (error != NULL)
4566 		goto done;
4567 
4568 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4569 	    repo, worktree);
4570 	if (error)
4571 		goto done;
4572 
4573 	init_curses();
4574 
4575 	error = apply_unveil(got_repo_get_path(repo),
4576 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4577 	if (error)
4578 		goto done;
4579 
4580 	/* already loaded by tog_log_with_path()? */
4581 	if (TAILQ_EMPTY(&tog_refs)) {
4582 		error = tog_load_refs(repo, 0);
4583 		if (error)
4584 			goto done;
4585 	}
4586 
4587 	if (start_commit == NULL) {
4588 		error = got_repo_match_object_id(&start_id, &label,
4589 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4590 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4591 		if (error)
4592 			goto done;
4593 		head_ref_name = label;
4594 	} else {
4595 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4596 		    repo, worktree);
4597 		if (error != NULL)
4598 			goto done;
4599 		if (keyword_idstr != NULL)
4600 			start_commit = keyword_idstr;
4601 
4602 		error = got_ref_open(&ref, repo, start_commit, 0);
4603 		if (error == NULL)
4604 			head_ref_name = got_ref_get_name(ref);
4605 		else if (error->code != GOT_ERR_NOT_REF)
4606 			goto done;
4607 		error = got_repo_match_object_id(&start_id, NULL,
4608 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4609 		if (error)
4610 			goto done;
4611 	}
4612 
4613 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4614 	if (view == NULL) {
4615 		error = got_error_from_errno("view_open");
4616 		goto done;
4617 	}
4618 
4619 	if (worktree) {
4620 		error = set_tog_base_commit(repo, worktree);
4621 		if (error != NULL)
4622 			goto done;
4623 	}
4624 
4625 	error = open_log_view(view, start_id, repo, head_ref_name,
4626 	    in_repo_path, log_branches, worktree);
4627 	if (error)
4628 		goto done;
4629 
4630 	if (worktree) {
4631 		/* The work tree will be closed by the log thread. */
4632 		worktree = NULL;
4633 	}
4634 
4635 	error = view_loop(view);
4636 
4637 done:
4638 	free(tog_base_commit.id);
4639 	free(keyword_idstr);
4640 	free(in_repo_path);
4641 	free(repo_path);
4642 	free(cwd);
4643 	free(start_id);
4644 	free(label);
4645 	if (ref)
4646 		got_ref_close(ref);
4647 	if (repo) {
4648 		const struct got_error *close_err = got_repo_close(repo);
4649 		if (error == NULL)
4650 			error = close_err;
4651 	}
4652 	if (worktree)
4653 		got_worktree_close(worktree);
4654 	if (pack_fds) {
4655 		const struct got_error *pack_err =
4656 		    got_repo_pack_fds_close(pack_fds);
4657 		if (error == NULL)
4658 			error = pack_err;
4659 	}
4660 	tog_free_refs();
4661 	return error;
4662 }
4663 
4664 __dead static void
4665 usage_diff(void)
4666 {
4667 	endwin();
4668 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4669 	    "object1 object2\n", getprogname());
4670 	exit(1);
4671 }
4672 
4673 static int
4674 match_line(const char *line, regex_t *regex, size_t nmatch,
4675     regmatch_t *regmatch)
4676 {
4677 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4678 }
4679 
4680 static struct tog_color *
4681 match_color(struct tog_colors *colors, const char *line)
4682 {
4683 	struct tog_color *tc = NULL;
4684 
4685 	STAILQ_FOREACH(tc, colors, entry) {
4686 		if (match_line(line, &tc->regex, 0, NULL))
4687 			return tc;
4688 	}
4689 
4690 	return NULL;
4691 }
4692 
4693 static const struct got_error *
4694 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4695     WINDOW *window, int skipcol, regmatch_t *regmatch)
4696 {
4697 	const struct got_error *err = NULL;
4698 	char *exstr = NULL;
4699 	wchar_t *wline = NULL;
4700 	int rme, rms, n, width, scrollx;
4701 	int width0 = 0, width1 = 0, width2 = 0;
4702 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4703 
4704 	*wtotal = 0;
4705 
4706 	rms = regmatch->rm_so;
4707 	rme = regmatch->rm_eo;
4708 
4709 	err = expand_tab(&exstr, line);
4710 	if (err)
4711 		return err;
4712 
4713 	/* Split the line into 3 segments, according to match offsets. */
4714 	seg0 = strndup(exstr, rms);
4715 	if (seg0 == NULL) {
4716 		err = got_error_from_errno("strndup");
4717 		goto done;
4718 	}
4719 	seg1 = strndup(exstr + rms, rme - rms);
4720 	if (seg1 == NULL) {
4721 		err = got_error_from_errno("strndup");
4722 		goto done;
4723 	}
4724 	seg2 = strdup(exstr + rme);
4725 	if (seg2 == NULL) {
4726 		err = got_error_from_errno("strndup");
4727 		goto done;
4728 	}
4729 
4730 	/* draw up to matched token if we haven't scrolled past it */
4731 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4732 	    col_tab_align, 1);
4733 	if (err)
4734 		goto done;
4735 	n = MAX(width0 - skipcol, 0);
4736 	if (n) {
4737 		free(wline);
4738 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4739 		    wlimit, col_tab_align, 1);
4740 		if (err)
4741 			goto done;
4742 		waddwstr(window, &wline[scrollx]);
4743 		wlimit -= width;
4744 		*wtotal += width;
4745 	}
4746 
4747 	if (wlimit > 0) {
4748 		int i = 0, w = 0;
4749 		size_t wlen;
4750 
4751 		free(wline);
4752 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4753 		    col_tab_align, 1);
4754 		if (err)
4755 			goto done;
4756 		wlen = wcslen(wline);
4757 		while (i < wlen) {
4758 			width = wcwidth(wline[i]);
4759 			if (width == -1) {
4760 				/* should not happen, tabs are expanded */
4761 				err = got_error(GOT_ERR_RANGE);
4762 				goto done;
4763 			}
4764 			if (width0 + w + width > skipcol)
4765 				break;
4766 			w += width;
4767 			i++;
4768 		}
4769 		/* draw (visible part of) matched token (if scrolled into it) */
4770 		if (width1 - w > 0) {
4771 			wattron(window, A_STANDOUT);
4772 			waddwstr(window, &wline[i]);
4773 			wattroff(window, A_STANDOUT);
4774 			wlimit -= (width1 - w);
4775 			*wtotal += (width1 - w);
4776 		}
4777 	}
4778 
4779 	if (wlimit > 0) {  /* draw rest of line */
4780 		free(wline);
4781 		if (skipcol > width0 + width1) {
4782 			err = format_line(&wline, &width2, &scrollx, seg2,
4783 			    skipcol - (width0 + width1), wlimit,
4784 			    col_tab_align, 1);
4785 			if (err)
4786 				goto done;
4787 			waddwstr(window, &wline[scrollx]);
4788 		} else {
4789 			err = format_line(&wline, &width2, NULL, seg2, 0,
4790 			    wlimit, col_tab_align, 1);
4791 			if (err)
4792 				goto done;
4793 			waddwstr(window, wline);
4794 		}
4795 		*wtotal += width2;
4796 	}
4797 done:
4798 	free(wline);
4799 	free(exstr);
4800 	free(seg0);
4801 	free(seg1);
4802 	free(seg2);
4803 	return err;
4804 }
4805 
4806 static int
4807 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4808 {
4809 	FILE	*f = NULL;
4810 	int	*eof, *first, *selected;
4811 
4812 	if (view->type == TOG_VIEW_DIFF) {
4813 		struct tog_diff_view_state *s = &view->state.diff;
4814 
4815 		first = &s->first_displayed_line;
4816 		selected = first;
4817 		eof = &s->eof;
4818 		f = s->f;
4819 	} else if (view->type == TOG_VIEW_HELP) {
4820 		struct tog_help_view_state *s = &view->state.help;
4821 
4822 		first = &s->first_displayed_line;
4823 		selected = first;
4824 		eof = &s->eof;
4825 		f = s->f;
4826 	} else if (view->type == TOG_VIEW_BLAME) {
4827 		struct tog_blame_view_state *s = &view->state.blame;
4828 
4829 		first = &s->first_displayed_line;
4830 		selected = &s->selected_line;
4831 		eof = &s->eof;
4832 		f = s->blame.f;
4833 	} else
4834 		return 0;
4835 
4836 	/* Center gline in the middle of the page like vi(1). */
4837 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4838 		return 0;
4839 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4840 		rewind(f);
4841 		*eof = 0;
4842 		*first = 1;
4843 		*lineno = 0;
4844 		*nprinted = 0;
4845 		return 0;
4846 	}
4847 
4848 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4849 		view->gline : (view->nlines - 3) / 2 + 1;
4850 	view->gline = 0;
4851 
4852 	return 1;
4853 }
4854 
4855 static const struct got_error *
4856 draw_file(struct tog_view *view, const char *header)
4857 {
4858 	struct tog_diff_view_state *s = &view->state.diff;
4859 	regmatch_t *regmatch = &view->regmatch;
4860 	const struct got_error *err;
4861 	int nprinted = 0;
4862 	char *line;
4863 	size_t linesize = 0;
4864 	ssize_t linelen;
4865 	wchar_t *wline;
4866 	int width;
4867 	int max_lines = view->nlines;
4868 	int nlines = s->nlines;
4869 	off_t line_offset;
4870 
4871 	s->lineno = s->first_displayed_line - 1;
4872 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4873 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4874 		return got_error_from_errno("fseek");
4875 
4876 	werase(view->window);
4877 
4878 	if (view->gline > s->nlines - 1)
4879 		view->gline = s->nlines - 1;
4880 
4881 	if (header) {
4882 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4883 		    1 : view->gline - (view->nlines - 3) / 2 :
4884 		    s->lineno + s->selected_line;
4885 
4886 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4887 			return got_error_from_errno("asprintf");
4888 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4889 		    0, 0);
4890 		free(line);
4891 		if (err)
4892 			return err;
4893 
4894 		if (view_needs_focus_indication(view))
4895 			wstandout(view->window);
4896 		waddwstr(view->window, wline);
4897 		free(wline);
4898 		wline = NULL;
4899 		while (width++ < view->ncols)
4900 			waddch(view->window, ' ');
4901 		if (view_needs_focus_indication(view))
4902 			wstandend(view->window);
4903 
4904 		if (max_lines <= 1)
4905 			return NULL;
4906 		max_lines--;
4907 	}
4908 
4909 	s->eof = 0;
4910 	view->maxx = 0;
4911 	line = NULL;
4912 	while (max_lines > 0 && nprinted < max_lines) {
4913 		enum got_diff_line_type linetype;
4914 		attr_t attr = 0;
4915 
4916 		linelen = getline(&line, &linesize, s->f);
4917 		if (linelen == -1) {
4918 			if (feof(s->f)) {
4919 				s->eof = 1;
4920 				break;
4921 			}
4922 			free(line);
4923 			return got_ferror(s->f, GOT_ERR_IO);
4924 		}
4925 
4926 		if (++s->lineno < s->first_displayed_line)
4927 			continue;
4928 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4929 			continue;
4930 		if (s->lineno == view->hiline)
4931 			attr = A_STANDOUT;
4932 
4933 		/* Set view->maxx based on full line length. */
4934 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4935 		    view->x ? 1 : 0);
4936 		if (err) {
4937 			free(line);
4938 			return err;
4939 		}
4940 		view->maxx = MAX(view->maxx, width);
4941 		free(wline);
4942 		wline = NULL;
4943 
4944 		linetype = s->lines[s->lineno].type;
4945 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4946 		    linetype < GOT_DIFF_LINE_CONTEXT)
4947 			attr |= COLOR_PAIR(linetype);
4948 		if (attr)
4949 			wattron(view->window, attr);
4950 		if (s->first_displayed_line + nprinted == s->matched_line &&
4951 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4952 			err = add_matched_line(&width, line, view->ncols, 0,
4953 			    view->window, view->x, regmatch);
4954 			if (err) {
4955 				free(line);
4956 				return err;
4957 			}
4958 		} else {
4959 			int skip;
4960 			err = format_line(&wline, &width, &skip, line,
4961 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4962 			if (err) {
4963 				free(line);
4964 				return err;
4965 			}
4966 			waddwstr(view->window, &wline[skip]);
4967 			free(wline);
4968 			wline = NULL;
4969 		}
4970 		if (s->lineno == view->hiline) {
4971 			/* highlight full gline length */
4972 			while (width++ < view->ncols)
4973 				waddch(view->window, ' ');
4974 		} else {
4975 			if (width <= view->ncols - 1)
4976 				waddch(view->window, '\n');
4977 		}
4978 		if (attr)
4979 			wattroff(view->window, attr);
4980 		if (++nprinted == 1)
4981 			s->first_displayed_line = s->lineno;
4982 	}
4983 	free(line);
4984 	if (nprinted >= 1)
4985 		s->last_displayed_line = s->first_displayed_line +
4986 		    (nprinted - 1);
4987 	else
4988 		s->last_displayed_line = s->first_displayed_line;
4989 
4990 	view_border(view);
4991 
4992 	if (s->eof) {
4993 		while (nprinted < view->nlines) {
4994 			waddch(view->window, '\n');
4995 			nprinted++;
4996 		}
4997 
4998 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4999 		    view->ncols, 0, 0);
5000 		if (err) {
5001 			return err;
5002 		}
5003 
5004 		wstandout(view->window);
5005 		waddwstr(view->window, wline);
5006 		free(wline);
5007 		wline = NULL;
5008 		wstandend(view->window);
5009 	}
5010 
5011 	return NULL;
5012 }
5013 
5014 static char *
5015 get_datestr(time_t *time, char *datebuf)
5016 {
5017 	struct tm mytm, *tm;
5018 	char *p, *s;
5019 
5020 	tm = gmtime_r(time, &mytm);
5021 	if (tm == NULL)
5022 		return NULL;
5023 	s = asctime_r(tm, datebuf);
5024 	if (s == NULL)
5025 		return NULL;
5026 	p = strchr(s, '\n');
5027 	if (p)
5028 		*p = '\0';
5029 	return s;
5030 }
5031 
5032 static const struct got_error *
5033 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
5034     off_t off, uint8_t type)
5035 {
5036 	struct got_diff_line *p;
5037 
5038 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
5039 	if (p == NULL)
5040 		return got_error_from_errno("reallocarray");
5041 	*lines = p;
5042 	(*lines)[*nlines].offset = off;
5043 	(*lines)[*nlines].type = type;
5044 	(*nlines)++;
5045 
5046 	return NULL;
5047 }
5048 
5049 static const struct got_error *
5050 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
5051     struct got_diff_line *s_lines, size_t s_nlines)
5052 {
5053 	struct got_diff_line	*p;
5054 	char			 buf[BUFSIZ];
5055 	size_t			 i, r;
5056 
5057 	if (fseeko(src, 0L, SEEK_SET) == -1)
5058 		return got_error_from_errno("fseeko");
5059 
5060 	for (;;) {
5061 		r = fread(buf, 1, sizeof(buf), src);
5062 		if (r == 0) {
5063 			if (ferror(src))
5064 				return got_error_from_errno("fread");
5065 			if (feof(src))
5066 				break;
5067 		}
5068 		if (fwrite(buf, 1, r, dst) != r)
5069 			return got_ferror(dst, GOT_ERR_IO);
5070 	}
5071 
5072 	if (s_nlines == 0 && *d_nlines == 0)
5073 		return NULL;
5074 
5075 	/*
5076 	 * If commit info was in dst, increment line offsets
5077 	 * of the appended diff content, but skip s_lines[0]
5078 	 * because offset zero is already in *d_lines.
5079 	 */
5080 	if (*d_nlines > 0) {
5081 		for (i = 1; i < s_nlines; ++i)
5082 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5083 
5084 		if (s_nlines > 0) {
5085 			--s_nlines;
5086 			++s_lines;
5087 		}
5088 	}
5089 
5090 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5091 	if (p == NULL) {
5092 		/* d_lines is freed in close_diff_view() */
5093 		return got_error_from_errno("reallocarray");
5094 	}
5095 
5096 	*d_lines = p;
5097 
5098 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5099 	*d_nlines += s_nlines;
5100 
5101 	return NULL;
5102 }
5103 
5104 static const struct got_error *
5105 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5106     struct got_object_id *commit_id, struct got_reflist_head *refs,
5107     struct got_repository *repo, int ignore_ws, int force_text_diff,
5108     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5109 {
5110 	const struct got_error *err = NULL;
5111 	char datebuf[26], *datestr;
5112 	struct got_commit_object *commit;
5113 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5114 	time_t committer_time;
5115 	const char *author, *committer;
5116 	char *refs_str = NULL;
5117 	struct got_pathlist_entry *pe;
5118 	off_t outoff = 0;
5119 	int n;
5120 
5121 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5122 	if (err)
5123 		return err;
5124 
5125 	err = got_object_open_as_commit(&commit, repo, commit_id);
5126 	if (err)
5127 		return err;
5128 
5129 	err = got_object_id_str(&id_str, commit_id);
5130 	if (err) {
5131 		err = got_error_from_errno("got_object_id_str");
5132 		goto done;
5133 	}
5134 
5135 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5136 	if (err)
5137 		goto done;
5138 
5139 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5140 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5141 	if (n < 0) {
5142 		err = got_error_from_errno("fprintf");
5143 		goto done;
5144 	}
5145 	outoff += n;
5146 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5147 	if (err)
5148 		goto done;
5149 
5150 	n = fprintf(outfile, "from: %s\n",
5151 	    got_object_commit_get_author(commit));
5152 	if (n < 0) {
5153 		err = got_error_from_errno("fprintf");
5154 		goto done;
5155 	}
5156 	outoff += n;
5157 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5158 	if (err)
5159 		goto done;
5160 
5161 	author = got_object_commit_get_author(commit);
5162 	committer = got_object_commit_get_committer(commit);
5163 	if (strcmp(author, committer) != 0) {
5164 		n = fprintf(outfile, "via: %s\n", committer);
5165 		if (n < 0) {
5166 			err = got_error_from_errno("fprintf");
5167 			goto done;
5168 		}
5169 		outoff += n;
5170 		err = add_line_metadata(lines, nlines, outoff,
5171 		    GOT_DIFF_LINE_AUTHOR);
5172 		if (err)
5173 			goto done;
5174 	}
5175 	committer_time = got_object_commit_get_committer_time(commit);
5176 	datestr = get_datestr(&committer_time, datebuf);
5177 	if (datestr) {
5178 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5179 		if (n < 0) {
5180 			err = got_error_from_errno("fprintf");
5181 			goto done;
5182 		}
5183 		outoff += n;
5184 		err = add_line_metadata(lines, nlines, outoff,
5185 		    GOT_DIFF_LINE_DATE);
5186 		if (err)
5187 			goto done;
5188 	}
5189 	if (got_object_commit_get_nparents(commit) > 1) {
5190 		const struct got_object_id_queue *parent_ids;
5191 		struct got_object_qid *qid;
5192 		int pn = 1;
5193 		parent_ids = got_object_commit_get_parent_ids(commit);
5194 		STAILQ_FOREACH(qid, parent_ids, entry) {
5195 			err = got_object_id_str(&id_str, &qid->id);
5196 			if (err)
5197 				goto done;
5198 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5199 			if (n < 0) {
5200 				err = got_error_from_errno("fprintf");
5201 				goto done;
5202 			}
5203 			outoff += n;
5204 			err = add_line_metadata(lines, nlines, outoff,
5205 			    GOT_DIFF_LINE_META);
5206 			if (err)
5207 				goto done;
5208 			free(id_str);
5209 			id_str = NULL;
5210 		}
5211 	}
5212 
5213 	err = got_object_commit_get_logmsg(&logmsg, commit);
5214 	if (err)
5215 		goto done;
5216 	s = logmsg;
5217 	while ((line = strsep(&s, "\n")) != NULL) {
5218 		n = fprintf(outfile, "%s\n", line);
5219 		if (n < 0) {
5220 			err = got_error_from_errno("fprintf");
5221 			goto done;
5222 		}
5223 		outoff += n;
5224 		err = add_line_metadata(lines, nlines, outoff,
5225 		    GOT_DIFF_LINE_LOGMSG);
5226 		if (err)
5227 			goto done;
5228 	}
5229 
5230 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5231 		struct got_diff_changed_path *cp = pe->data;
5232 		int pad = dsa->max_path_len - pe->path_len + 1;
5233 
5234 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5235 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5236 		    dsa->rm_cols + 1, cp->rm);
5237 		if (n < 0) {
5238 			err = got_error_from_errno("fprintf");
5239 			goto done;
5240 		}
5241 		outoff += n;
5242 		err = add_line_metadata(lines, nlines, outoff,
5243 		    GOT_DIFF_LINE_CHANGES);
5244 		if (err)
5245 			goto done;
5246 	}
5247 
5248 	fputc('\n', outfile);
5249 	outoff++;
5250 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5251 	if (err)
5252 		goto done;
5253 
5254 	n = fprintf(outfile,
5255 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5256 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5257 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5258 	if (n < 0) {
5259 		err = got_error_from_errno("fprintf");
5260 		goto done;
5261 	}
5262 	outoff += n;
5263 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5264 	if (err)
5265 		goto done;
5266 
5267 	fputc('\n', outfile);
5268 	outoff++;
5269 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5270 done:
5271 	free(id_str);
5272 	free(logmsg);
5273 	free(refs_str);
5274 	got_object_commit_close(commit);
5275 	if (err) {
5276 		free(*lines);
5277 		*lines = NULL;
5278 		*nlines = 0;
5279 	}
5280 	return err;
5281 }
5282 
5283 static const struct got_error *
5284 create_diff(struct tog_diff_view_state *s)
5285 {
5286 	const struct got_error *err = NULL;
5287 	FILE *f = NULL, *tmp_diff_file = NULL;
5288 	int obj_type;
5289 	struct got_diff_line *lines = NULL;
5290 	struct got_pathlist_head changed_paths;
5291 
5292 	TAILQ_INIT(&changed_paths);
5293 
5294 	free(s->lines);
5295 	s->lines = malloc(sizeof(*s->lines));
5296 	if (s->lines == NULL)
5297 		return got_error_from_errno("malloc");
5298 	s->nlines = 0;
5299 
5300 	f = got_opentemp();
5301 	if (f == NULL) {
5302 		err = got_error_from_errno("got_opentemp");
5303 		goto done;
5304 	}
5305 	tmp_diff_file = got_opentemp();
5306 	if (tmp_diff_file == NULL) {
5307 		err = got_error_from_errno("got_opentemp");
5308 		goto done;
5309 	}
5310 	if (s->f && fclose(s->f) == EOF) {
5311 		err = got_error_from_errno("fclose");
5312 		goto done;
5313 	}
5314 	s->f = f;
5315 
5316 	if (s->id1)
5317 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5318 	else
5319 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5320 	if (err)
5321 		goto done;
5322 
5323 	switch (obj_type) {
5324 	case GOT_OBJ_TYPE_BLOB:
5325 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5326 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5327 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5328 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5329 		    s->f);
5330 		break;
5331 	case GOT_OBJ_TYPE_TREE:
5332 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5333 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5334 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5335 		    s->force_text_diff, NULL, s->repo, s->f);
5336 		break;
5337 	case GOT_OBJ_TYPE_COMMIT: {
5338 		const struct got_object_id_queue *parent_ids;
5339 		struct got_object_qid *pid;
5340 		struct got_commit_object *commit2;
5341 		struct got_reflist_head *refs;
5342 		size_t nlines = 0;
5343 		struct got_diffstat_cb_arg dsa = {
5344 			0, 0, 0, 0, 0, 0,
5345 			&changed_paths,
5346 			s->ignore_whitespace,
5347 			s->force_text_diff,
5348 			tog_diff_algo
5349 		};
5350 
5351 		lines = malloc(sizeof(*lines));
5352 		if (lines == NULL) {
5353 			err = got_error_from_errno("malloc");
5354 			goto done;
5355 		}
5356 
5357 		/* build diff first in tmp file then append to commit info */
5358 		err = got_diff_objects_as_commits(&lines, &nlines,
5359 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5360 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5361 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5362 		if (err)
5363 			break;
5364 
5365 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5366 		if (err)
5367 			goto done;
5368 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5369 		/* Show commit info if we're diffing to a parent/root commit. */
5370 		if (s->id1 == NULL) {
5371 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5372 			    refs, s->repo, s->ignore_whitespace,
5373 			    s->force_text_diff, &dsa, s->f);
5374 			if (err)
5375 				goto done;
5376 		} else {
5377 			parent_ids = got_object_commit_get_parent_ids(commit2);
5378 			STAILQ_FOREACH(pid, parent_ids, entry) {
5379 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5380 					err = write_commit_info(&s->lines,
5381 					    &s->nlines, s->id2, refs, s->repo,
5382 					    s->ignore_whitespace,
5383 					    s->force_text_diff, &dsa, s->f);
5384 					if (err)
5385 						goto done;
5386 					break;
5387 				}
5388 			}
5389 		}
5390 		got_object_commit_close(commit2);
5391 
5392 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5393 		    lines, nlines);
5394 		break;
5395 	}
5396 	default:
5397 		err = got_error(GOT_ERR_OBJ_TYPE);
5398 		break;
5399 	}
5400 done:
5401 	free(lines);
5402 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5403 	if (s->f && fflush(s->f) != 0 && err == NULL)
5404 		err = got_error_from_errno("fflush");
5405 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5406 		err = got_error_from_errno("fclose");
5407 	return err;
5408 }
5409 
5410 static void
5411 diff_view_indicate_progress(struct tog_view *view)
5412 {
5413 	mvwaddstr(view->window, 0, 0, "diffing...");
5414 	update_panels();
5415 	doupdate();
5416 }
5417 
5418 static const struct got_error *
5419 search_start_diff_view(struct tog_view *view)
5420 {
5421 	struct tog_diff_view_state *s = &view->state.diff;
5422 
5423 	s->matched_line = 0;
5424 	return NULL;
5425 }
5426 
5427 static void
5428 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5429     size_t *nlines, int **first, int **last, int **match, int **selected)
5430 {
5431 	struct tog_diff_view_state *s = &view->state.diff;
5432 
5433 	*f = s->f;
5434 	*nlines = s->nlines;
5435 	*line_offsets = NULL;
5436 	*match = &s->matched_line;
5437 	*first = &s->first_displayed_line;
5438 	*last = &s->last_displayed_line;
5439 	*selected = &s->selected_line;
5440 }
5441 
5442 static const struct got_error *
5443 search_next_view_match(struct tog_view *view)
5444 {
5445 	const struct got_error *err = NULL;
5446 	FILE *f;
5447 	int lineno;
5448 	char *line = NULL;
5449 	size_t linesize = 0;
5450 	ssize_t linelen;
5451 	off_t *line_offsets;
5452 	size_t nlines = 0;
5453 	int *first, *last, *match, *selected;
5454 
5455 	if (!view->search_setup)
5456 		return got_error_msg(GOT_ERR_NOT_IMPL,
5457 		    "view search not supported");
5458 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5459 	    &match, &selected);
5460 
5461 	if (!view->searching) {
5462 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5463 		return NULL;
5464 	}
5465 
5466 	if (*match) {
5467 		if (view->searching == TOG_SEARCH_FORWARD)
5468 			lineno = *first + 1;
5469 		else
5470 			lineno = *first - 1;
5471 	} else
5472 		lineno = *first - 1 + *selected;
5473 
5474 	while (1) {
5475 		off_t offset;
5476 
5477 		if (lineno <= 0 || lineno > nlines) {
5478 			if (*match == 0) {
5479 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5480 				break;
5481 			}
5482 
5483 			if (view->searching == TOG_SEARCH_FORWARD)
5484 				lineno = 1;
5485 			else
5486 				lineno = nlines;
5487 		}
5488 
5489 		offset = view->type == TOG_VIEW_DIFF ?
5490 		    view->state.diff.lines[lineno - 1].offset :
5491 		    line_offsets[lineno - 1];
5492 		if (fseeko(f, offset, SEEK_SET) != 0) {
5493 			free(line);
5494 			return got_error_from_errno("fseeko");
5495 		}
5496 		linelen = getline(&line, &linesize, f);
5497 		if (linelen != -1) {
5498 			char *exstr;
5499 			err = expand_tab(&exstr, line);
5500 			if (err)
5501 				break;
5502 			if (match_line(exstr, &view->regex, 1,
5503 			    &view->regmatch)) {
5504 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5505 				*match = lineno;
5506 				free(exstr);
5507 				break;
5508 			}
5509 			free(exstr);
5510 		}
5511 		if (view->searching == TOG_SEARCH_FORWARD)
5512 			lineno++;
5513 		else
5514 			lineno--;
5515 	}
5516 	free(line);
5517 
5518 	if (*match) {
5519 		*first = *match;
5520 		*selected = 1;
5521 	}
5522 
5523 	return err;
5524 }
5525 
5526 static const struct got_error *
5527 close_diff_view(struct tog_view *view)
5528 {
5529 	const struct got_error *err = NULL;
5530 	struct tog_diff_view_state *s = &view->state.diff;
5531 
5532 	free(s->id1);
5533 	s->id1 = NULL;
5534 	free(s->id2);
5535 	s->id2 = NULL;
5536 	if (s->f && fclose(s->f) == EOF)
5537 		err = got_error_from_errno("fclose");
5538 	s->f = NULL;
5539 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5540 		err = got_error_from_errno("fclose");
5541 	s->f1 = NULL;
5542 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5543 		err = got_error_from_errno("fclose");
5544 	s->f2 = NULL;
5545 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5546 		err = got_error_from_errno("close");
5547 	s->fd1 = -1;
5548 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5549 		err = got_error_from_errno("close");
5550 	s->fd2 = -1;
5551 	free(s->lines);
5552 	s->lines = NULL;
5553 	s->nlines = 0;
5554 	return err;
5555 }
5556 
5557 static const struct got_error *
5558 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5559     struct got_object_id *id2, const char *label1, const char *label2,
5560     int diff_context, int ignore_whitespace, int force_text_diff,
5561     struct tog_view *parent_view, struct got_repository *repo)
5562 {
5563 	const struct got_error *err;
5564 	struct tog_diff_view_state *s = &view->state.diff;
5565 
5566 	memset(s, 0, sizeof(*s));
5567 	s->fd1 = -1;
5568 	s->fd2 = -1;
5569 
5570 	if (id1 != NULL && id2 != NULL) {
5571 		int type1, type2;
5572 
5573 		err = got_object_get_type(&type1, repo, id1);
5574 		if (err)
5575 			goto done;
5576 		err = got_object_get_type(&type2, repo, id2);
5577 		if (err)
5578 			goto done;
5579 
5580 		if (type1 != type2) {
5581 			err = got_error(GOT_ERR_OBJ_TYPE);
5582 			goto done;
5583 		}
5584 	}
5585 	s->first_displayed_line = 1;
5586 	s->last_displayed_line = view->nlines;
5587 	s->selected_line = 1;
5588 	s->repo = repo;
5589 	s->id1 = id1;
5590 	s->id2 = id2;
5591 	s->label1 = label1;
5592 	s->label2 = label2;
5593 
5594 	if (id1) {
5595 		s->id1 = got_object_id_dup(id1);
5596 		if (s->id1 == NULL) {
5597 			err = got_error_from_errno("got_object_id_dup");
5598 			goto done;
5599 		}
5600 	} else
5601 		s->id1 = NULL;
5602 
5603 	s->id2 = got_object_id_dup(id2);
5604 	if (s->id2 == NULL) {
5605 		err = got_error_from_errno("got_object_id_dup");
5606 		goto done;
5607 	}
5608 
5609 	s->f1 = got_opentemp();
5610 	if (s->f1 == NULL) {
5611 		err = got_error_from_errno("got_opentemp");
5612 		goto done;
5613 	}
5614 
5615 	s->f2 = got_opentemp();
5616 	if (s->f2 == NULL) {
5617 		err = got_error_from_errno("got_opentemp");
5618 		goto done;
5619 	}
5620 
5621 	s->fd1 = got_opentempfd();
5622 	if (s->fd1 == -1) {
5623 		err = got_error_from_errno("got_opentempfd");
5624 		goto done;
5625 	}
5626 
5627 	s->fd2 = got_opentempfd();
5628 	if (s->fd2 == -1) {
5629 		err = got_error_from_errno("got_opentempfd");
5630 		goto done;
5631 	}
5632 
5633 	s->diff_context = diff_context;
5634 	s->ignore_whitespace = ignore_whitespace;
5635 	s->force_text_diff = force_text_diff;
5636 	s->parent_view = parent_view;
5637 	s->repo = repo;
5638 
5639 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5640 		int rc;
5641 
5642 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5643 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5644 		if (rc != ERR)
5645 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5646 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5647 		if (rc != ERR)
5648 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5649 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5650 		if (rc != ERR)
5651 			rc = init_pair(GOT_DIFF_LINE_META,
5652 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5653 		if (rc != ERR)
5654 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5655 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5656 		if (rc != ERR)
5657 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5658 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5659 		if (rc != ERR)
5660 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5661 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5662 		if (rc != ERR)
5663 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5664 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5665 		if (rc != ERR)
5666 			rc = init_pair(GOT_DIFF_LINE_DATE,
5667 			    get_color_value("TOG_COLOR_DATE"), -1);
5668 		if (rc == ERR) {
5669 			err = got_error(GOT_ERR_RANGE);
5670 			goto done;
5671 		}
5672 	}
5673 
5674 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5675 	    view_is_splitscreen(view))
5676 		show_log_view(parent_view); /* draw border */
5677 	diff_view_indicate_progress(view);
5678 
5679 	err = create_diff(s);
5680 
5681 	view->show = show_diff_view;
5682 	view->input = input_diff_view;
5683 	view->reset = reset_diff_view;
5684 	view->close = close_diff_view;
5685 	view->search_start = search_start_diff_view;
5686 	view->search_setup = search_setup_diff_view;
5687 	view->search_next = search_next_view_match;
5688 done:
5689 	if (err) {
5690 		if (view->close == NULL)
5691 			close_diff_view(view);
5692 		view_close(view);
5693 	}
5694 	return err;
5695 }
5696 
5697 static const struct got_error *
5698 show_diff_view(struct tog_view *view)
5699 {
5700 	const struct got_error *err;
5701 	struct tog_diff_view_state *s = &view->state.diff;
5702 	char *id_str1 = NULL, *id_str2, *header;
5703 	const char *label1, *label2;
5704 
5705 	if (s->id1) {
5706 		err = got_object_id_str(&id_str1, s->id1);
5707 		if (err)
5708 			return err;
5709 		label1 = s->label1 ? s->label1 : id_str1;
5710 	} else
5711 		label1 = "/dev/null";
5712 
5713 	err = got_object_id_str(&id_str2, s->id2);
5714 	if (err)
5715 		return err;
5716 	label2 = s->label2 ? s->label2 : id_str2;
5717 
5718 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5719 		err = got_error_from_errno("asprintf");
5720 		free(id_str1);
5721 		free(id_str2);
5722 		return err;
5723 	}
5724 	free(id_str1);
5725 	free(id_str2);
5726 
5727 	err = draw_file(view, header);
5728 	free(header);
5729 	return err;
5730 }
5731 
5732 static const struct got_error *
5733 set_selected_commit(struct tog_diff_view_state *s,
5734     struct commit_queue_entry *entry)
5735 {
5736 	const struct got_error *err;
5737 	const struct got_object_id_queue *parent_ids;
5738 	struct got_commit_object *selected_commit;
5739 	struct got_object_qid *pid;
5740 
5741 	free(s->id2);
5742 	s->id2 = got_object_id_dup(entry->id);
5743 	if (s->id2 == NULL)
5744 		return got_error_from_errno("got_object_id_dup");
5745 
5746 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5747 	if (err)
5748 		return err;
5749 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5750 	free(s->id1);
5751 	pid = STAILQ_FIRST(parent_ids);
5752 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5753 	got_object_commit_close(selected_commit);
5754 	return NULL;
5755 }
5756 
5757 static const struct got_error *
5758 reset_diff_view(struct tog_view *view)
5759 {
5760 	struct tog_diff_view_state *s = &view->state.diff;
5761 
5762 	view->count = 0;
5763 	wclear(view->window);
5764 	s->first_displayed_line = 1;
5765 	s->last_displayed_line = view->nlines;
5766 	s->matched_line = 0;
5767 	diff_view_indicate_progress(view);
5768 	return create_diff(s);
5769 }
5770 
5771 static void
5772 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5773 {
5774 	int start, i;
5775 
5776 	i = start = s->first_displayed_line - 1;
5777 
5778 	while (s->lines[i].type != type) {
5779 		if (i == 0)
5780 			i = s->nlines - 1;
5781 		if (--i == start)
5782 			return; /* do nothing, requested type not in file */
5783 	}
5784 
5785 	s->selected_line = 1;
5786 	s->first_displayed_line = i;
5787 }
5788 
5789 static void
5790 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5791 {
5792 	int start, i;
5793 
5794 	i = start = s->first_displayed_line + 1;
5795 
5796 	while (s->lines[i].type != type) {
5797 		if (i == s->nlines - 1)
5798 			i = 0;
5799 		if (++i == start)
5800 			return; /* do nothing, requested type not in file */
5801 	}
5802 
5803 	s->selected_line = 1;
5804 	s->first_displayed_line = i;
5805 }
5806 
5807 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5808     int, int, int);
5809 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5810     int, int);
5811 
5812 static const struct got_error *
5813 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5814 {
5815 	const struct got_error *err = NULL;
5816 	struct tog_diff_view_state *s = &view->state.diff;
5817 	struct tog_log_view_state *ls;
5818 	struct commit_queue_entry *old_selected_entry;
5819 	char *line = NULL;
5820 	size_t linesize = 0;
5821 	ssize_t linelen;
5822 	int i, nscroll = view->nlines - 1, up = 0;
5823 
5824 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5825 
5826 	switch (ch) {
5827 	case '0':
5828 	case '$':
5829 	case KEY_RIGHT:
5830 	case 'l':
5831 	case KEY_LEFT:
5832 	case 'h':
5833 		horizontal_scroll_input(view, ch);
5834 		break;
5835 	case 'a':
5836 	case 'w':
5837 		if (ch == 'a') {
5838 			s->force_text_diff = !s->force_text_diff;
5839 			view->action = s->force_text_diff ?
5840 			    "force ASCII text enabled" :
5841 			    "force ASCII text disabled";
5842 		}
5843 		else if (ch == 'w') {
5844 			s->ignore_whitespace = !s->ignore_whitespace;
5845 			view->action = s->ignore_whitespace ?
5846 			    "ignore whitespace enabled" :
5847 			    "ignore whitespace disabled";
5848 		}
5849 		err = reset_diff_view(view);
5850 		break;
5851 	case 'g':
5852 	case KEY_HOME:
5853 		s->first_displayed_line = 1;
5854 		view->count = 0;
5855 		break;
5856 	case 'G':
5857 	case KEY_END:
5858 		view->count = 0;
5859 		if (s->eof)
5860 			break;
5861 
5862 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5863 		s->eof = 1;
5864 		break;
5865 	case 'k':
5866 	case KEY_UP:
5867 	case CTRL('p'):
5868 		if (s->first_displayed_line > 1)
5869 			s->first_displayed_line--;
5870 		else
5871 			view->count = 0;
5872 		break;
5873 	case CTRL('u'):
5874 	case 'u':
5875 		nscroll /= 2;
5876 		/* FALL THROUGH */
5877 	case KEY_PPAGE:
5878 	case CTRL('b'):
5879 	case 'b':
5880 		if (s->first_displayed_line == 1) {
5881 			view->count = 0;
5882 			break;
5883 		}
5884 		i = 0;
5885 		while (i++ < nscroll && s->first_displayed_line > 1)
5886 			s->first_displayed_line--;
5887 		break;
5888 	case 'j':
5889 	case KEY_DOWN:
5890 	case CTRL('n'):
5891 		if (!s->eof)
5892 			s->first_displayed_line++;
5893 		else
5894 			view->count = 0;
5895 		break;
5896 	case CTRL('d'):
5897 	case 'd':
5898 		nscroll /= 2;
5899 		/* FALL THROUGH */
5900 	case KEY_NPAGE:
5901 	case CTRL('f'):
5902 	case 'f':
5903 	case ' ':
5904 		if (s->eof) {
5905 			view->count = 0;
5906 			break;
5907 		}
5908 		i = 0;
5909 		while (!s->eof && i++ < nscroll) {
5910 			linelen = getline(&line, &linesize, s->f);
5911 			s->first_displayed_line++;
5912 			if (linelen == -1) {
5913 				if (feof(s->f)) {
5914 					s->eof = 1;
5915 				} else
5916 					err = got_ferror(s->f, GOT_ERR_IO);
5917 				break;
5918 			}
5919 		}
5920 		free(line);
5921 		break;
5922 	case '(':
5923 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5924 		break;
5925 	case ')':
5926 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5927 		break;
5928 	case '{':
5929 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5930 		break;
5931 	case '}':
5932 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5933 		break;
5934 	case '[':
5935 		if (s->diff_context > 0) {
5936 			s->diff_context--;
5937 			s->matched_line = 0;
5938 			diff_view_indicate_progress(view);
5939 			err = create_diff(s);
5940 			if (s->first_displayed_line + view->nlines - 1 >
5941 			    s->nlines) {
5942 				s->first_displayed_line = 1;
5943 				s->last_displayed_line = view->nlines;
5944 			}
5945 		} else
5946 			view->count = 0;
5947 		break;
5948 	case ']':
5949 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5950 			s->diff_context++;
5951 			s->matched_line = 0;
5952 			diff_view_indicate_progress(view);
5953 			err = create_diff(s);
5954 		} else
5955 			view->count = 0;
5956 		break;
5957 	case '<':
5958 	case ',':
5959 	case 'K':
5960 		up = 1;
5961 		/* FALL THROUGH */
5962 	case '>':
5963 	case '.':
5964 	case 'J':
5965 		if (s->parent_view == NULL) {
5966 			view->count = 0;
5967 			break;
5968 		}
5969 		s->parent_view->count = view->count;
5970 
5971 		if (s->parent_view->type == TOG_VIEW_LOG) {
5972 			ls = &s->parent_view->state.log;
5973 			old_selected_entry = ls->selected_entry;
5974 
5975 			err = input_log_view(NULL, s->parent_view,
5976 			    up ? KEY_UP : KEY_DOWN);
5977 			if (err)
5978 				break;
5979 			view->count = s->parent_view->count;
5980 
5981 			if (old_selected_entry == ls->selected_entry)
5982 				break;
5983 
5984 			err = set_selected_commit(s, ls->selected_entry);
5985 			if (err)
5986 				break;
5987 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5988 			struct tog_blame_view_state *bs;
5989 			struct got_object_id *id, *prev_id;
5990 
5991 			bs = &s->parent_view->state.blame;
5992 			prev_id = get_annotation_for_line(bs->blame.lines,
5993 			    bs->blame.nlines, bs->last_diffed_line);
5994 
5995 			err = input_blame_view(&view, s->parent_view,
5996 			    up ? KEY_UP : KEY_DOWN);
5997 			if (err)
5998 				break;
5999 			view->count = s->parent_view->count;
6000 
6001 			if (prev_id == NULL)
6002 				break;
6003 			id = get_selected_commit_id(bs->blame.lines,
6004 			    bs->blame.nlines, bs->first_displayed_line,
6005 			    bs->selected_line);
6006 			if (id == NULL)
6007 				break;
6008 
6009 			if (!got_object_id_cmp(prev_id, id))
6010 				break;
6011 
6012 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
6013 			if (err)
6014 				break;
6015 		}
6016 		s->first_displayed_line = 1;
6017 		s->last_displayed_line = view->nlines;
6018 		s->matched_line = 0;
6019 		view->x = 0;
6020 
6021 		diff_view_indicate_progress(view);
6022 		err = create_diff(s);
6023 		break;
6024 	default:
6025 		view->count = 0;
6026 		break;
6027 	}
6028 
6029 	return err;
6030 }
6031 
6032 static const struct got_error *
6033 cmd_diff(int argc, char *argv[])
6034 {
6035 	const struct got_error *error;
6036 	struct got_repository *repo = NULL;
6037 	struct got_worktree *worktree = NULL;
6038 	struct got_object_id *id1 = NULL, *id2 = NULL;
6039 	char *repo_path = NULL, *cwd = NULL;
6040 	char *id_str1 = NULL, *id_str2 = NULL;
6041 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
6042 	char *label1 = NULL, *label2 = NULL;
6043 	int diff_context = 3, ignore_whitespace = 0;
6044 	int ch, force_text_diff = 0;
6045 	const char *errstr;
6046 	struct tog_view *view;
6047 	int *pack_fds = NULL;
6048 
6049 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
6050 		switch (ch) {
6051 		case 'a':
6052 			force_text_diff = 1;
6053 			break;
6054 		case 'C':
6055 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
6056 			    &errstr);
6057 			if (errstr != NULL)
6058 				errx(1, "number of context lines is %s: %s",
6059 				    errstr, errstr);
6060 			break;
6061 		case 'r':
6062 			repo_path = realpath(optarg, NULL);
6063 			if (repo_path == NULL)
6064 				return got_error_from_errno2("realpath",
6065 				    optarg);
6066 			got_path_strip_trailing_slashes(repo_path);
6067 			break;
6068 		case 'w':
6069 			ignore_whitespace = 1;
6070 			break;
6071 		default:
6072 			usage_diff();
6073 			/* NOTREACHED */
6074 		}
6075 	}
6076 
6077 	argc -= optind;
6078 	argv += optind;
6079 
6080 	if (argc == 0) {
6081 		usage_diff(); /* TODO show local worktree changes */
6082 	} else if (argc == 2) {
6083 		id_str1 = argv[0];
6084 		id_str2 = argv[1];
6085 	} else
6086 		usage_diff();
6087 
6088 	error = got_repo_pack_fds_open(&pack_fds);
6089 	if (error)
6090 		goto done;
6091 
6092 	if (repo_path == NULL) {
6093 		cwd = getcwd(NULL, 0);
6094 		if (cwd == NULL)
6095 			return got_error_from_errno("getcwd");
6096 		error = got_worktree_open(&worktree, cwd, NULL);
6097 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6098 			goto done;
6099 		if (worktree)
6100 			repo_path =
6101 			    strdup(got_worktree_get_repo_path(worktree));
6102 		else
6103 			repo_path = strdup(cwd);
6104 		if (repo_path == NULL) {
6105 			error = got_error_from_errno("strdup");
6106 			goto done;
6107 		}
6108 	}
6109 
6110 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6111 	if (error)
6112 		goto done;
6113 
6114 	init_curses();
6115 
6116 	error = apply_unveil(got_repo_get_path(repo), NULL);
6117 	if (error)
6118 		goto done;
6119 
6120 	error = tog_load_refs(repo, 0);
6121 	if (error)
6122 		goto done;
6123 
6124 	if (id_str1 != NULL) {
6125 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6126 		    repo, worktree);
6127 		if (error != NULL)
6128 			goto done;
6129 		if (keyword_idstr1 != NULL)
6130 			id_str1 = keyword_idstr1;
6131 	}
6132 	if (id_str2 != NULL) {
6133 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6134 		    repo, worktree);
6135 		if (error != NULL)
6136 			goto done;
6137 		if (keyword_idstr2 != NULL)
6138 			id_str2 = keyword_idstr2;
6139 	}
6140 
6141 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6142 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6143 	if (error)
6144 		goto done;
6145 
6146 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6147 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6148 	if (error)
6149 		goto done;
6150 
6151 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6152 	if (view == NULL) {
6153 		error = got_error_from_errno("view_open");
6154 		goto done;
6155 	}
6156 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6157 	    ignore_whitespace, force_text_diff, NULL,  repo);
6158 	if (error)
6159 		goto done;
6160 
6161 	if (worktree) {
6162 		error = set_tog_base_commit(repo, worktree);
6163 		if (error != NULL)
6164 			goto done;
6165 	}
6166 
6167 	error = view_loop(view);
6168 
6169 done:
6170 	free(tog_base_commit.id);
6171 	free(keyword_idstr1);
6172 	free(keyword_idstr2);
6173 	free(label1);
6174 	free(label2);
6175 	free(repo_path);
6176 	free(cwd);
6177 	if (repo) {
6178 		const struct got_error *close_err = got_repo_close(repo);
6179 		if (error == NULL)
6180 			error = close_err;
6181 	}
6182 	if (worktree)
6183 		got_worktree_close(worktree);
6184 	if (pack_fds) {
6185 		const struct got_error *pack_err =
6186 		    got_repo_pack_fds_close(pack_fds);
6187 		if (error == NULL)
6188 			error = pack_err;
6189 	}
6190 	tog_free_refs();
6191 	return error;
6192 }
6193 
6194 __dead static void
6195 usage_blame(void)
6196 {
6197 	endwin();
6198 	fprintf(stderr,
6199 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6200 	    getprogname());
6201 	exit(1);
6202 }
6203 
6204 struct tog_blame_line {
6205 	int annotated;
6206 	struct got_object_id *id;
6207 };
6208 
6209 static const struct got_error *
6210 draw_blame(struct tog_view *view)
6211 {
6212 	struct tog_blame_view_state *s = &view->state.blame;
6213 	struct tog_blame *blame = &s->blame;
6214 	regmatch_t *regmatch = &view->regmatch;
6215 	const struct got_error *err;
6216 	int lineno = 0, nprinted = 0;
6217 	char *line = NULL;
6218 	size_t linesize = 0;
6219 	ssize_t linelen;
6220 	wchar_t *wline;
6221 	int width;
6222 	struct tog_blame_line *blame_line;
6223 	struct got_object_id *prev_id = NULL;
6224 	char *id_str;
6225 	struct tog_color *tc;
6226 
6227 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6228 	if (err)
6229 		return err;
6230 
6231 	rewind(blame->f);
6232 	werase(view->window);
6233 
6234 	if (asprintf(&line, "commit %s", id_str) == -1) {
6235 		err = got_error_from_errno("asprintf");
6236 		free(id_str);
6237 		return err;
6238 	}
6239 
6240 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6241 	free(line);
6242 	line = NULL;
6243 	if (err)
6244 		return err;
6245 	if (view_needs_focus_indication(view))
6246 		wstandout(view->window);
6247 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6248 	if (tc)
6249 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6250 	waddwstr(view->window, wline);
6251 	while (width++ < view->ncols)
6252 		waddch(view->window, ' ');
6253 	if (tc)
6254 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6255 	if (view_needs_focus_indication(view))
6256 		wstandend(view->window);
6257 	free(wline);
6258 	wline = NULL;
6259 
6260 	if (view->gline > blame->nlines)
6261 		view->gline = blame->nlines;
6262 
6263 	if (tog_io.wait_for_ui) {
6264 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6265 		int rc;
6266 
6267 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6268 		if (rc)
6269 			return got_error_set_errno(rc, "pthread_cond_wait");
6270 		tog_io.wait_for_ui = 0;
6271 	}
6272 
6273 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6274 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6275 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6276 		free(id_str);
6277 		return got_error_from_errno("asprintf");
6278 	}
6279 	free(id_str);
6280 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6281 	free(line);
6282 	line = NULL;
6283 	if (err)
6284 		return err;
6285 	waddwstr(view->window, wline);
6286 	free(wline);
6287 	wline = NULL;
6288 	if (width < view->ncols - 1)
6289 		waddch(view->window, '\n');
6290 
6291 	s->eof = 0;
6292 	view->maxx = 0;
6293 	while (nprinted < view->nlines - 2) {
6294 		linelen = getline(&line, &linesize, blame->f);
6295 		if (linelen == -1) {
6296 			if (feof(blame->f)) {
6297 				s->eof = 1;
6298 				break;
6299 			}
6300 			free(line);
6301 			return got_ferror(blame->f, GOT_ERR_IO);
6302 		}
6303 		if (++lineno < s->first_displayed_line)
6304 			continue;
6305 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6306 			continue;
6307 
6308 		/* Set view->maxx based on full line length. */
6309 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6310 		if (err) {
6311 			free(line);
6312 			return err;
6313 		}
6314 		free(wline);
6315 		wline = NULL;
6316 		view->maxx = MAX(view->maxx, width);
6317 
6318 		if (nprinted == s->selected_line - 1)
6319 			wstandout(view->window);
6320 
6321 		if (blame->nlines > 0) {
6322 			blame_line = &blame->lines[lineno - 1];
6323 			if (blame_line->annotated && prev_id &&
6324 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6325 			    !(nprinted == s->selected_line - 1)) {
6326 				waddstr(view->window, "        ");
6327 			} else if (blame_line->annotated) {
6328 				char *id_str;
6329 				err = got_object_id_str(&id_str,
6330 				    blame_line->id);
6331 				if (err) {
6332 					free(line);
6333 					return err;
6334 				}
6335 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6336 				if (tc)
6337 					wattr_on(view->window,
6338 					    COLOR_PAIR(tc->colorpair), NULL);
6339 				wprintw(view->window, "%.8s", id_str);
6340 				if (tc)
6341 					wattr_off(view->window,
6342 					    COLOR_PAIR(tc->colorpair), NULL);
6343 				free(id_str);
6344 				prev_id = blame_line->id;
6345 			} else {
6346 				waddstr(view->window, "........");
6347 				prev_id = NULL;
6348 			}
6349 		} else {
6350 			waddstr(view->window, "........");
6351 			prev_id = NULL;
6352 		}
6353 
6354 		if (nprinted == s->selected_line - 1)
6355 			wstandend(view->window);
6356 		waddstr(view->window, " ");
6357 
6358 		if (view->ncols <= 9) {
6359 			width = 9;
6360 		} else if (s->first_displayed_line + nprinted ==
6361 		    s->matched_line &&
6362 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6363 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6364 			    view->window, view->x, regmatch);
6365 			if (err) {
6366 				free(line);
6367 				return err;
6368 			}
6369 			width += 9;
6370 		} else {
6371 			int skip;
6372 			err = format_line(&wline, &width, &skip, line,
6373 			    view->x, view->ncols - 9, 9, 1);
6374 			if (err) {
6375 				free(line);
6376 				return err;
6377 			}
6378 			waddwstr(view->window, &wline[skip]);
6379 			width += 9;
6380 			free(wline);
6381 			wline = NULL;
6382 		}
6383 
6384 		if (width <= view->ncols - 1)
6385 			waddch(view->window, '\n');
6386 		if (++nprinted == 1)
6387 			s->first_displayed_line = lineno;
6388 	}
6389 	free(line);
6390 	s->last_displayed_line = lineno;
6391 
6392 	view_border(view);
6393 
6394 	return NULL;
6395 }
6396 
6397 static const struct got_error *
6398 blame_cb(void *arg, int nlines, int lineno,
6399     struct got_commit_object *commit, struct got_object_id *id)
6400 {
6401 	const struct got_error *err = NULL;
6402 	struct tog_blame_cb_args *a = arg;
6403 	struct tog_blame_line *line;
6404 	int errcode;
6405 
6406 	if (nlines != a->nlines ||
6407 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6408 		return got_error(GOT_ERR_RANGE);
6409 
6410 	errcode = pthread_mutex_lock(&tog_mutex);
6411 	if (errcode)
6412 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6413 
6414 	if (*a->quit) {	/* user has quit the blame view */
6415 		err = got_error(GOT_ERR_ITER_COMPLETED);
6416 		goto done;
6417 	}
6418 
6419 	if (lineno == -1)
6420 		goto done; /* no change in this commit */
6421 
6422 	line = &a->lines[lineno - 1];
6423 	if (line->annotated)
6424 		goto done;
6425 
6426 	line->id = got_object_id_dup(id);
6427 	if (line->id == NULL) {
6428 		err = got_error_from_errno("got_object_id_dup");
6429 		goto done;
6430 	}
6431 	line->annotated = 1;
6432 done:
6433 	errcode = pthread_mutex_unlock(&tog_mutex);
6434 	if (errcode)
6435 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6436 	return err;
6437 }
6438 
6439 static void *
6440 blame_thread(void *arg)
6441 {
6442 	const struct got_error *err, *close_err;
6443 	struct tog_blame_thread_args *ta = arg;
6444 	struct tog_blame_cb_args *a = ta->cb_args;
6445 	int errcode, fd1 = -1, fd2 = -1;
6446 	FILE *f1 = NULL, *f2 = NULL;
6447 
6448 	fd1 = got_opentempfd();
6449 	if (fd1 == -1)
6450 		return (void *)got_error_from_errno("got_opentempfd");
6451 
6452 	fd2 = got_opentempfd();
6453 	if (fd2 == -1) {
6454 		err = got_error_from_errno("got_opentempfd");
6455 		goto done;
6456 	}
6457 
6458 	f1 = got_opentemp();
6459 	if (f1 == NULL) {
6460 		err = (void *)got_error_from_errno("got_opentemp");
6461 		goto done;
6462 	}
6463 	f2 = got_opentemp();
6464 	if (f2 == NULL) {
6465 		err = (void *)got_error_from_errno("got_opentemp");
6466 		goto done;
6467 	}
6468 
6469 	err = block_signals_used_by_main_thread();
6470 	if (err)
6471 		goto done;
6472 
6473 	err = got_blame(ta->path, a->commit_id, ta->repo,
6474 	    tog_diff_algo, blame_cb, ta->cb_args,
6475 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6476 	if (err && err->code == GOT_ERR_CANCELLED)
6477 		err = NULL;
6478 
6479 	errcode = pthread_mutex_lock(&tog_mutex);
6480 	if (errcode) {
6481 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6482 		goto done;
6483 	}
6484 
6485 	close_err = got_repo_close(ta->repo);
6486 	if (err == NULL)
6487 		err = close_err;
6488 	ta->repo = NULL;
6489 	*ta->complete = 1;
6490 
6491 	if (tog_io.wait_for_ui) {
6492 		errcode = pthread_cond_signal(&ta->blame_complete);
6493 		if (errcode && err == NULL)
6494 			err = got_error_set_errno(errcode,
6495 			    "pthread_cond_signal");
6496 	}
6497 
6498 	errcode = pthread_mutex_unlock(&tog_mutex);
6499 	if (errcode && err == NULL)
6500 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6501 
6502 done:
6503 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6504 		err = got_error_from_errno("close");
6505 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6506 		err = got_error_from_errno("close");
6507 	if (f1 && fclose(f1) == EOF && err == NULL)
6508 		err = got_error_from_errno("fclose");
6509 	if (f2 && fclose(f2) == EOF && err == NULL)
6510 		err = got_error_from_errno("fclose");
6511 
6512 	return (void *)err;
6513 }
6514 
6515 static struct got_object_id *
6516 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6517     int first_displayed_line, int selected_line)
6518 {
6519 	struct tog_blame_line *line;
6520 
6521 	if (nlines <= 0)
6522 		return NULL;
6523 
6524 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6525 	if (!line->annotated)
6526 		return NULL;
6527 
6528 	return line->id;
6529 }
6530 
6531 static struct got_object_id *
6532 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6533     int lineno)
6534 {
6535 	struct tog_blame_line *line;
6536 
6537 	if (nlines <= 0 || lineno >= nlines)
6538 		return NULL;
6539 
6540 	line = &lines[lineno - 1];
6541 	if (!line->annotated)
6542 		return NULL;
6543 
6544 	return line->id;
6545 }
6546 
6547 static const struct got_error *
6548 stop_blame(struct tog_blame *blame)
6549 {
6550 	const struct got_error *err = NULL;
6551 	int i;
6552 
6553 	if (blame->thread) {
6554 		int errcode;
6555 		errcode = pthread_mutex_unlock(&tog_mutex);
6556 		if (errcode)
6557 			return got_error_set_errno(errcode,
6558 			    "pthread_mutex_unlock");
6559 		errcode = pthread_join(blame->thread, (void **)&err);
6560 		if (errcode)
6561 			return got_error_set_errno(errcode, "pthread_join");
6562 		errcode = pthread_mutex_lock(&tog_mutex);
6563 		if (errcode)
6564 			return got_error_set_errno(errcode,
6565 			    "pthread_mutex_lock");
6566 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6567 			err = NULL;
6568 		blame->thread = 0; //NULL;
6569 	}
6570 	if (blame->thread_args.repo) {
6571 		const struct got_error *close_err;
6572 		close_err = got_repo_close(blame->thread_args.repo);
6573 		if (err == NULL)
6574 			err = close_err;
6575 		blame->thread_args.repo = NULL;
6576 	}
6577 	if (blame->f) {
6578 		if (fclose(blame->f) == EOF && err == NULL)
6579 			err = got_error_from_errno("fclose");
6580 		blame->f = NULL;
6581 	}
6582 	if (blame->lines) {
6583 		for (i = 0; i < blame->nlines; i++)
6584 			free(blame->lines[i].id);
6585 		free(blame->lines);
6586 		blame->lines = NULL;
6587 	}
6588 	free(blame->cb_args.commit_id);
6589 	blame->cb_args.commit_id = NULL;
6590 	if (blame->pack_fds) {
6591 		const struct got_error *pack_err =
6592 		    got_repo_pack_fds_close(blame->pack_fds);
6593 		if (err == NULL)
6594 			err = pack_err;
6595 		blame->pack_fds = NULL;
6596 	}
6597 	return err;
6598 }
6599 
6600 static const struct got_error *
6601 cancel_blame_view(void *arg)
6602 {
6603 	const struct got_error *err = NULL;
6604 	int *done = arg;
6605 	int errcode;
6606 
6607 	errcode = pthread_mutex_lock(&tog_mutex);
6608 	if (errcode)
6609 		return got_error_set_errno(errcode,
6610 		    "pthread_mutex_unlock");
6611 
6612 	if (*done)
6613 		err = got_error(GOT_ERR_CANCELLED);
6614 
6615 	errcode = pthread_mutex_unlock(&tog_mutex);
6616 	if (errcode)
6617 		return got_error_set_errno(errcode,
6618 		    "pthread_mutex_lock");
6619 
6620 	return err;
6621 }
6622 
6623 static const struct got_error *
6624 run_blame(struct tog_view *view)
6625 {
6626 	struct tog_blame_view_state *s = &view->state.blame;
6627 	struct tog_blame *blame = &s->blame;
6628 	const struct got_error *err = NULL;
6629 	struct got_commit_object *commit = NULL;
6630 	struct got_blob_object *blob = NULL;
6631 	struct got_repository *thread_repo = NULL;
6632 	struct got_object_id *obj_id = NULL;
6633 	int obj_type, fd = -1;
6634 	int *pack_fds = NULL;
6635 
6636 	err = got_object_open_as_commit(&commit, s->repo,
6637 	    &s->blamed_commit->id);
6638 	if (err)
6639 		return err;
6640 
6641 	fd = got_opentempfd();
6642 	if (fd == -1) {
6643 		err = got_error_from_errno("got_opentempfd");
6644 		goto done;
6645 	}
6646 
6647 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6648 	if (err)
6649 		goto done;
6650 
6651 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6652 	if (err)
6653 		goto done;
6654 
6655 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6656 		err = got_error(GOT_ERR_OBJ_TYPE);
6657 		goto done;
6658 	}
6659 
6660 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6661 	if (err)
6662 		goto done;
6663 	blame->f = got_opentemp();
6664 	if (blame->f == NULL) {
6665 		err = got_error_from_errno("got_opentemp");
6666 		goto done;
6667 	}
6668 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6669 	    &blame->line_offsets, blame->f, blob);
6670 	if (err)
6671 		goto done;
6672 	if (blame->nlines == 0) {
6673 		s->blame_complete = 1;
6674 		goto done;
6675 	}
6676 
6677 	/* Don't include \n at EOF in the blame line count. */
6678 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6679 		blame->nlines--;
6680 
6681 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6682 	if (blame->lines == NULL) {
6683 		err = got_error_from_errno("calloc");
6684 		goto done;
6685 	}
6686 
6687 	err = got_repo_pack_fds_open(&pack_fds);
6688 	if (err)
6689 		goto done;
6690 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6691 	    pack_fds);
6692 	if (err)
6693 		goto done;
6694 
6695 	blame->pack_fds = pack_fds;
6696 	blame->cb_args.view = view;
6697 	blame->cb_args.lines = blame->lines;
6698 	blame->cb_args.nlines = blame->nlines;
6699 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6700 	if (blame->cb_args.commit_id == NULL) {
6701 		err = got_error_from_errno("got_object_id_dup");
6702 		goto done;
6703 	}
6704 	blame->cb_args.quit = &s->done;
6705 
6706 	blame->thread_args.path = s->path;
6707 	blame->thread_args.repo = thread_repo;
6708 	blame->thread_args.cb_args = &blame->cb_args;
6709 	blame->thread_args.complete = &s->blame_complete;
6710 	blame->thread_args.cancel_cb = cancel_blame_view;
6711 	blame->thread_args.cancel_arg = &s->done;
6712 	s->blame_complete = 0;
6713 
6714 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6715 		s->first_displayed_line = 1;
6716 		s->last_displayed_line = view->nlines;
6717 		s->selected_line = 1;
6718 	}
6719 	s->matched_line = 0;
6720 
6721 done:
6722 	if (commit)
6723 		got_object_commit_close(commit);
6724 	if (fd != -1 && close(fd) == -1 && err == NULL)
6725 		err = got_error_from_errno("close");
6726 	if (blob)
6727 		got_object_blob_close(blob);
6728 	free(obj_id);
6729 	if (err)
6730 		stop_blame(blame);
6731 	return err;
6732 }
6733 
6734 static const struct got_error *
6735 open_blame_view(struct tog_view *view, char *path,
6736     struct got_object_id *commit_id, struct got_repository *repo)
6737 {
6738 	const struct got_error *err = NULL;
6739 	struct tog_blame_view_state *s = &view->state.blame;
6740 
6741 	STAILQ_INIT(&s->blamed_commits);
6742 
6743 	s->path = strdup(path);
6744 	if (s->path == NULL)
6745 		return got_error_from_errno("strdup");
6746 
6747 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6748 	if (err) {
6749 		free(s->path);
6750 		return err;
6751 	}
6752 
6753 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6754 	s->first_displayed_line = 1;
6755 	s->last_displayed_line = view->nlines;
6756 	s->selected_line = 1;
6757 	s->blame_complete = 0;
6758 	s->repo = repo;
6759 	s->commit_id = commit_id;
6760 	memset(&s->blame, 0, sizeof(s->blame));
6761 
6762 	STAILQ_INIT(&s->colors);
6763 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6764 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6765 		    get_color_value("TOG_COLOR_COMMIT"));
6766 		if (err)
6767 			return err;
6768 	}
6769 
6770 	view->show = show_blame_view;
6771 	view->input = input_blame_view;
6772 	view->reset = reset_blame_view;
6773 	view->close = close_blame_view;
6774 	view->search_start = search_start_blame_view;
6775 	view->search_setup = search_setup_blame_view;
6776 	view->search_next = search_next_view_match;
6777 
6778 	if (using_mock_io) {
6779 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6780 		int rc;
6781 
6782 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6783 		if (rc)
6784 			return got_error_set_errno(rc, "pthread_cond_init");
6785 	}
6786 
6787 	return run_blame(view);
6788 }
6789 
6790 static const struct got_error *
6791 close_blame_view(struct tog_view *view)
6792 {
6793 	const struct got_error *err = NULL;
6794 	struct tog_blame_view_state *s = &view->state.blame;
6795 
6796 	if (s->blame.thread)
6797 		err = stop_blame(&s->blame);
6798 
6799 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6800 		struct got_object_qid *blamed_commit;
6801 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6802 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6803 		got_object_qid_free(blamed_commit);
6804 	}
6805 
6806 	if (using_mock_io) {
6807 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6808 		int rc;
6809 
6810 		rc = pthread_cond_destroy(&bta->blame_complete);
6811 		if (rc && err == NULL)
6812 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6813 	}
6814 
6815 	free(s->path);
6816 	free_colors(&s->colors);
6817 	return err;
6818 }
6819 
6820 static const struct got_error *
6821 search_start_blame_view(struct tog_view *view)
6822 {
6823 	struct tog_blame_view_state *s = &view->state.blame;
6824 
6825 	s->matched_line = 0;
6826 	return NULL;
6827 }
6828 
6829 static void
6830 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6831     size_t *nlines, int **first, int **last, int **match, int **selected)
6832 {
6833 	struct tog_blame_view_state *s = &view->state.blame;
6834 
6835 	*f = s->blame.f;
6836 	*nlines = s->blame.nlines;
6837 	*line_offsets = s->blame.line_offsets;
6838 	*match = &s->matched_line;
6839 	*first = &s->first_displayed_line;
6840 	*last = &s->last_displayed_line;
6841 	*selected = &s->selected_line;
6842 }
6843 
6844 static const struct got_error *
6845 show_blame_view(struct tog_view *view)
6846 {
6847 	const struct got_error *err = NULL;
6848 	struct tog_blame_view_state *s = &view->state.blame;
6849 	int errcode;
6850 
6851 	if (s->blame.thread == 0 && !s->blame_complete) {
6852 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6853 		    &s->blame.thread_args);
6854 		if (errcode)
6855 			return got_error_set_errno(errcode, "pthread_create");
6856 
6857 		if (!using_mock_io)
6858 			halfdelay(1); /* fast refresh while annotating  */
6859 	}
6860 
6861 	if (s->blame_complete && !using_mock_io)
6862 		halfdelay(10); /* disable fast refresh */
6863 
6864 	err = draw_blame(view);
6865 
6866 	view_border(view);
6867 	return err;
6868 }
6869 
6870 static const struct got_error *
6871 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6872     struct got_repository *repo, struct got_object_id *id)
6873 {
6874 	struct tog_view		*log_view;
6875 	const struct got_error	*err = NULL;
6876 
6877 	*new_view = NULL;
6878 
6879 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6880 	if (log_view == NULL)
6881 		return got_error_from_errno("view_open");
6882 
6883 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0, NULL);
6884 	if (err)
6885 		view_close(log_view);
6886 	else
6887 		*new_view = log_view;
6888 
6889 	return err;
6890 }
6891 
6892 static const struct got_error *
6893 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6894 {
6895 	const struct got_error *err = NULL, *thread_err = NULL;
6896 	struct tog_view *diff_view;
6897 	struct tog_blame_view_state *s = &view->state.blame;
6898 	int eos, nscroll, begin_y = 0, begin_x = 0;
6899 
6900 	eos = nscroll = view->nlines - 2;
6901 	if (view_is_hsplit_top(view))
6902 		--eos;  /* border */
6903 
6904 	switch (ch) {
6905 	case '0':
6906 	case '$':
6907 	case KEY_RIGHT:
6908 	case 'l':
6909 	case KEY_LEFT:
6910 	case 'h':
6911 		horizontal_scroll_input(view, ch);
6912 		break;
6913 	case 'q':
6914 		s->done = 1;
6915 		break;
6916 	case 'g':
6917 	case KEY_HOME:
6918 		s->selected_line = 1;
6919 		s->first_displayed_line = 1;
6920 		view->count = 0;
6921 		break;
6922 	case 'G':
6923 	case KEY_END:
6924 		if (s->blame.nlines < eos) {
6925 			s->selected_line = s->blame.nlines;
6926 			s->first_displayed_line = 1;
6927 		} else {
6928 			s->selected_line = eos;
6929 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6930 		}
6931 		view->count = 0;
6932 		break;
6933 	case 'k':
6934 	case KEY_UP:
6935 	case CTRL('p'):
6936 		if (s->selected_line > 1)
6937 			s->selected_line--;
6938 		else if (s->selected_line == 1 &&
6939 		    s->first_displayed_line > 1)
6940 			s->first_displayed_line--;
6941 		else
6942 			view->count = 0;
6943 		break;
6944 	case CTRL('u'):
6945 	case 'u':
6946 		nscroll /= 2;
6947 		/* FALL THROUGH */
6948 	case KEY_PPAGE:
6949 	case CTRL('b'):
6950 	case 'b':
6951 		if (s->first_displayed_line == 1) {
6952 			if (view->count > 1)
6953 				nscroll += nscroll;
6954 			s->selected_line = MAX(1, s->selected_line - nscroll);
6955 			view->count = 0;
6956 			break;
6957 		}
6958 		if (s->first_displayed_line > nscroll)
6959 			s->first_displayed_line -= nscroll;
6960 		else
6961 			s->first_displayed_line = 1;
6962 		break;
6963 	case 'j':
6964 	case KEY_DOWN:
6965 	case CTRL('n'):
6966 		if (s->selected_line < eos && s->first_displayed_line +
6967 		    s->selected_line <= s->blame.nlines)
6968 			s->selected_line++;
6969 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6970 			s->first_displayed_line++;
6971 		else
6972 			view->count = 0;
6973 		break;
6974 	case 'c':
6975 	case 'p': {
6976 		struct got_object_id *id = NULL;
6977 
6978 		view->count = 0;
6979 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6980 		    s->first_displayed_line, s->selected_line);
6981 		if (id == NULL)
6982 			break;
6983 		if (ch == 'p') {
6984 			struct got_commit_object *commit, *pcommit;
6985 			struct got_object_qid *pid;
6986 			struct got_object_id *blob_id = NULL;
6987 			int obj_type;
6988 			err = got_object_open_as_commit(&commit,
6989 			    s->repo, id);
6990 			if (err)
6991 				break;
6992 			pid = STAILQ_FIRST(
6993 			    got_object_commit_get_parent_ids(commit));
6994 			if (pid == NULL) {
6995 				got_object_commit_close(commit);
6996 				break;
6997 			}
6998 			/* Check if path history ends here. */
6999 			err = got_object_open_as_commit(&pcommit,
7000 			    s->repo, &pid->id);
7001 			if (err)
7002 				break;
7003 			err = got_object_id_by_path(&blob_id, s->repo,
7004 			    pcommit, s->path);
7005 			got_object_commit_close(pcommit);
7006 			if (err) {
7007 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
7008 					err = NULL;
7009 				got_object_commit_close(commit);
7010 				break;
7011 			}
7012 			err = got_object_get_type(&obj_type, s->repo,
7013 			    blob_id);
7014 			free(blob_id);
7015 			/* Can't blame non-blob type objects. */
7016 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
7017 				got_object_commit_close(commit);
7018 				break;
7019 			}
7020 			err = got_object_qid_alloc(&s->blamed_commit,
7021 			    &pid->id);
7022 			got_object_commit_close(commit);
7023 		} else {
7024 			if (got_object_id_cmp(id,
7025 			    &s->blamed_commit->id) == 0)
7026 				break;
7027 			err = got_object_qid_alloc(&s->blamed_commit,
7028 			    id);
7029 		}
7030 		if (err)
7031 			break;
7032 		s->done = 1;
7033 		thread_err = stop_blame(&s->blame);
7034 		s->done = 0;
7035 		if (thread_err)
7036 			break;
7037 		STAILQ_INSERT_HEAD(&s->blamed_commits,
7038 		    s->blamed_commit, entry);
7039 		err = run_blame(view);
7040 		if (err)
7041 			break;
7042 		break;
7043 	}
7044 	case 'C': {
7045 		struct got_object_qid *first;
7046 
7047 		view->count = 0;
7048 		first = STAILQ_FIRST(&s->blamed_commits);
7049 		if (!got_object_id_cmp(&first->id, s->commit_id))
7050 			break;
7051 		s->done = 1;
7052 		thread_err = stop_blame(&s->blame);
7053 		s->done = 0;
7054 		if (thread_err)
7055 			break;
7056 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
7057 		got_object_qid_free(s->blamed_commit);
7058 		s->blamed_commit =
7059 		    STAILQ_FIRST(&s->blamed_commits);
7060 		err = run_blame(view);
7061 		if (err)
7062 			break;
7063 		break;
7064 	}
7065 	case 'L':
7066 		view->count = 0;
7067 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7068 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7069 		if (s->id_to_log)
7070 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7071 		break;
7072 	case KEY_ENTER:
7073 	case '\r': {
7074 		struct got_object_id *id = NULL;
7075 		struct got_object_qid *pid;
7076 		struct got_commit_object *commit = NULL;
7077 
7078 		view->count = 0;
7079 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7080 		    s->first_displayed_line, s->selected_line);
7081 		if (id == NULL)
7082 			break;
7083 		err = got_object_open_as_commit(&commit, s->repo, id);
7084 		if (err)
7085 			break;
7086 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7087 		if (*new_view) {
7088 			/* traversed from diff view, release diff resources  */
7089 			err = close_diff_view(*new_view);
7090 			if (err)
7091 				break;
7092 			diff_view = *new_view;
7093 		} else {
7094 			if (view_is_parent_view(view))
7095 				view_get_split(view, &begin_y, &begin_x);
7096 
7097 			diff_view = view_open(0, 0, begin_y, begin_x,
7098 			    TOG_VIEW_DIFF);
7099 			if (diff_view == NULL) {
7100 				got_object_commit_close(commit);
7101 				err = got_error_from_errno("view_open");
7102 				break;
7103 			}
7104 		}
7105 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7106 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7107 		got_object_commit_close(commit);
7108 		if (err)
7109 			break;
7110 		s->last_diffed_line = s->first_displayed_line - 1 +
7111 		    s->selected_line;
7112 		if (*new_view)
7113 			break;	/* still open from active diff view */
7114 		if (view_is_parent_view(view) &&
7115 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7116 			err = view_init_hsplit(view, begin_y);
7117 			if (err)
7118 				break;
7119 		}
7120 
7121 		view->focussed = 0;
7122 		diff_view->focussed = 1;
7123 		diff_view->mode = view->mode;
7124 		diff_view->nlines = view->lines - begin_y;
7125 		if (view_is_parent_view(view)) {
7126 			view_transfer_size(diff_view, view);
7127 			err = view_close_child(view);
7128 			if (err)
7129 				break;
7130 			err = view_set_child(view, diff_view);
7131 			if (err)
7132 				break;
7133 			view->focus_child = 1;
7134 		} else
7135 			*new_view = diff_view;
7136 		if (err)
7137 			break;
7138 		break;
7139 	}
7140 	case CTRL('d'):
7141 	case 'd':
7142 		nscroll /= 2;
7143 		/* FALL THROUGH */
7144 	case KEY_NPAGE:
7145 	case CTRL('f'):
7146 	case 'f':
7147 	case ' ':
7148 		if (s->last_displayed_line >= s->blame.nlines &&
7149 		    s->selected_line >= MIN(s->blame.nlines,
7150 		    view->nlines - 2)) {
7151 			view->count = 0;
7152 			break;
7153 		}
7154 		if (s->last_displayed_line >= s->blame.nlines &&
7155 		    s->selected_line < view->nlines - 2) {
7156 			s->selected_line +=
7157 			    MIN(nscroll, s->last_displayed_line -
7158 			    s->first_displayed_line - s->selected_line + 1);
7159 		}
7160 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7161 			s->first_displayed_line += nscroll;
7162 		else
7163 			s->first_displayed_line =
7164 			    s->blame.nlines - (view->nlines - 3);
7165 		break;
7166 	case KEY_RESIZE:
7167 		if (s->selected_line > view->nlines - 2) {
7168 			s->selected_line = MIN(s->blame.nlines,
7169 			    view->nlines - 2);
7170 		}
7171 		break;
7172 	default:
7173 		view->count = 0;
7174 		break;
7175 	}
7176 	return thread_err ? thread_err : err;
7177 }
7178 
7179 static const struct got_error *
7180 reset_blame_view(struct tog_view *view)
7181 {
7182 	const struct got_error *err;
7183 	struct tog_blame_view_state *s = &view->state.blame;
7184 
7185 	view->count = 0;
7186 	s->done = 1;
7187 	err = stop_blame(&s->blame);
7188 	s->done = 0;
7189 	if (err)
7190 		return err;
7191 	return run_blame(view);
7192 }
7193 
7194 static const struct got_error *
7195 cmd_blame(int argc, char *argv[])
7196 {
7197 	const struct got_error *error;
7198 	struct got_repository *repo = NULL;
7199 	struct got_worktree *worktree = NULL;
7200 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7201 	char *link_target = NULL;
7202 	struct got_object_id *commit_id = NULL;
7203 	struct got_commit_object *commit = NULL;
7204 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7205 	int ch;
7206 	struct tog_view *view = NULL;
7207 	int *pack_fds = NULL;
7208 
7209 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7210 		switch (ch) {
7211 		case 'c':
7212 			commit_id_str = optarg;
7213 			break;
7214 		case 'r':
7215 			repo_path = realpath(optarg, NULL);
7216 			if (repo_path == NULL)
7217 				return got_error_from_errno2("realpath",
7218 				    optarg);
7219 			break;
7220 		default:
7221 			usage_blame();
7222 			/* NOTREACHED */
7223 		}
7224 	}
7225 
7226 	argc -= optind;
7227 	argv += optind;
7228 
7229 	if (argc != 1)
7230 		usage_blame();
7231 
7232 	error = got_repo_pack_fds_open(&pack_fds);
7233 	if (error != NULL)
7234 		goto done;
7235 
7236 	if (repo_path == NULL) {
7237 		cwd = getcwd(NULL, 0);
7238 		if (cwd == NULL)
7239 			return got_error_from_errno("getcwd");
7240 		error = got_worktree_open(&worktree, cwd, NULL);
7241 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7242 			goto done;
7243 		if (worktree)
7244 			repo_path =
7245 			    strdup(got_worktree_get_repo_path(worktree));
7246 		else
7247 			repo_path = strdup(cwd);
7248 		if (repo_path == NULL) {
7249 			error = got_error_from_errno("strdup");
7250 			goto done;
7251 		}
7252 	}
7253 
7254 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7255 	if (error != NULL)
7256 		goto done;
7257 
7258 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7259 	    worktree);
7260 	if (error)
7261 		goto done;
7262 
7263 	init_curses();
7264 
7265 	error = apply_unveil(got_repo_get_path(repo), NULL);
7266 	if (error)
7267 		goto done;
7268 
7269 	error = tog_load_refs(repo, 0);
7270 	if (error)
7271 		goto done;
7272 
7273 	if (commit_id_str == NULL) {
7274 		struct got_reference *head_ref;
7275 		error = got_ref_open(&head_ref, repo, worktree ?
7276 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7277 		if (error != NULL)
7278 			goto done;
7279 		error = got_ref_resolve(&commit_id, repo, head_ref);
7280 		got_ref_close(head_ref);
7281 	} else {
7282 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7283 		    repo, worktree);
7284 		if (error != NULL)
7285 			goto done;
7286 		if (keyword_idstr != NULL)
7287 			commit_id_str = keyword_idstr;
7288 
7289 		error = got_repo_match_object_id(&commit_id, NULL,
7290 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7291 	}
7292 	if (error != NULL)
7293 		goto done;
7294 
7295 	error = got_object_open_as_commit(&commit, repo, commit_id);
7296 	if (error)
7297 		goto done;
7298 
7299 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7300 	    commit, repo);
7301 	if (error)
7302 		goto done;
7303 
7304 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7305 	if (view == NULL) {
7306 		error = got_error_from_errno("view_open");
7307 		goto done;
7308 	}
7309 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7310 	    commit_id, repo);
7311 	if (error != NULL) {
7312 		if (view->close == NULL)
7313 			close_blame_view(view);
7314 		view_close(view);
7315 		goto done;
7316 	}
7317 
7318 	if (worktree) {
7319 		error = set_tog_base_commit(repo, worktree);
7320 		if (error != NULL)
7321 			goto done;
7322 
7323 		/* Release work tree lock. */
7324 		got_worktree_close(worktree);
7325 		worktree = NULL;
7326 	}
7327 
7328 	error = view_loop(view);
7329 
7330 done:
7331 	free(tog_base_commit.id);
7332 	free(repo_path);
7333 	free(in_repo_path);
7334 	free(link_target);
7335 	free(cwd);
7336 	free(commit_id);
7337 	free(keyword_idstr);
7338 	if (commit)
7339 		got_object_commit_close(commit);
7340 	if (worktree)
7341 		got_worktree_close(worktree);
7342 	if (repo) {
7343 		const struct got_error *close_err = got_repo_close(repo);
7344 		if (error == NULL)
7345 			error = close_err;
7346 	}
7347 	if (pack_fds) {
7348 		const struct got_error *pack_err =
7349 		    got_repo_pack_fds_close(pack_fds);
7350 		if (error == NULL)
7351 			error = pack_err;
7352 	}
7353 	tog_free_refs();
7354 	return error;
7355 }
7356 
7357 static const struct got_error *
7358 draw_tree_entries(struct tog_view *view, const char *parent_path)
7359 {
7360 	struct tog_tree_view_state *s = &view->state.tree;
7361 	const struct got_error *err = NULL;
7362 	struct got_tree_entry *te;
7363 	wchar_t *wline;
7364 	char *index = NULL;
7365 	struct tog_color *tc;
7366 	int width, n, nentries, scrollx, i = 1;
7367 	int limit = view->nlines;
7368 
7369 	s->ndisplayed = 0;
7370 	if (view_is_hsplit_top(view))
7371 		--limit;  /* border */
7372 
7373 	werase(view->window);
7374 
7375 	if (limit == 0)
7376 		return NULL;
7377 
7378 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7379 	    0, 0);
7380 	if (err)
7381 		return err;
7382 	if (view_needs_focus_indication(view))
7383 		wstandout(view->window);
7384 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7385 	if (tc)
7386 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7387 	waddwstr(view->window, wline);
7388 	free(wline);
7389 	wline = NULL;
7390 	while (width++ < view->ncols)
7391 		waddch(view->window, ' ');
7392 	if (tc)
7393 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7394 	if (view_needs_focus_indication(view))
7395 		wstandend(view->window);
7396 	if (--limit <= 0)
7397 		return NULL;
7398 
7399 	i += s->selected;
7400 	if (s->first_displayed_entry) {
7401 		i += got_tree_entry_get_index(s->first_displayed_entry);
7402 		if (s->tree != s->root)
7403 			++i;  /* account for ".." entry */
7404 	}
7405 	nentries = got_object_tree_get_nentries(s->tree);
7406 	if (asprintf(&index, "[%d/%d] %s",
7407 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7408 		return got_error_from_errno("asprintf");
7409 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7410 	free(index);
7411 	if (err)
7412 		return err;
7413 	waddwstr(view->window, wline);
7414 	free(wline);
7415 	wline = NULL;
7416 	if (width < view->ncols - 1)
7417 		waddch(view->window, '\n');
7418 	if (--limit <= 0)
7419 		return NULL;
7420 	waddch(view->window, '\n');
7421 	if (--limit <= 0)
7422 		return NULL;
7423 
7424 	if (s->first_displayed_entry == NULL) {
7425 		te = got_object_tree_get_first_entry(s->tree);
7426 		if (s->selected == 0) {
7427 			if (view->focussed)
7428 				wstandout(view->window);
7429 			s->selected_entry = NULL;
7430 		}
7431 		waddstr(view->window, "  ..\n");	/* parent directory */
7432 		if (s->selected == 0 && view->focussed)
7433 			wstandend(view->window);
7434 		s->ndisplayed++;
7435 		if (--limit <= 0)
7436 			return NULL;
7437 		n = 1;
7438 	} else {
7439 		n = 0;
7440 		te = s->first_displayed_entry;
7441 	}
7442 
7443 	view->maxx = 0;
7444 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7445 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7446 		const char *modestr = "";
7447 		mode_t mode;
7448 
7449 		te = got_object_tree_get_entry(s->tree, i);
7450 		mode = got_tree_entry_get_mode(te);
7451 
7452 		if (s->show_ids) {
7453 			err = got_object_id_str(&id_str,
7454 			    got_tree_entry_get_id(te));
7455 			if (err)
7456 				return got_error_from_errno(
7457 				    "got_object_id_str");
7458 		}
7459 		if (got_object_tree_entry_is_submodule(te))
7460 			modestr = "$";
7461 		else if (S_ISLNK(mode)) {
7462 			int i;
7463 
7464 			err = got_tree_entry_get_symlink_target(&link_target,
7465 			    te, s->repo);
7466 			if (err) {
7467 				free(id_str);
7468 				return err;
7469 			}
7470 			for (i = 0; link_target[i] != '\0'; i++) {
7471 				if (!isprint((unsigned char)link_target[i]))
7472 					link_target[i] = '?';
7473 			}
7474 			modestr = "@";
7475 		}
7476 		else if (S_ISDIR(mode))
7477 			modestr = "/";
7478 		else if (mode & S_IXUSR)
7479 			modestr = "*";
7480 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7481 		    got_tree_entry_get_name(te), modestr,
7482 		    link_target ? " -> ": "",
7483 		    link_target ? link_target : "") == -1) {
7484 			free(id_str);
7485 			free(link_target);
7486 			return got_error_from_errno("asprintf");
7487 		}
7488 		free(id_str);
7489 		free(link_target);
7490 
7491 		/* use full line width to determine view->maxx */
7492 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7493 		if (err) {
7494 			free(line);
7495 			break;
7496 		}
7497 		view->maxx = MAX(view->maxx, width);
7498 		free(wline);
7499 		wline = NULL;
7500 
7501 		err = format_line(&wline, &width, &scrollx, line, view->x,
7502 		    view->ncols, 0, 0);
7503 		if (err) {
7504 			free(line);
7505 			break;
7506 		}
7507 		if (n == s->selected) {
7508 			if (view->focussed)
7509 				wstandout(view->window);
7510 			s->selected_entry = te;
7511 		}
7512 		tc = match_color(&s->colors, line);
7513 		if (tc)
7514 			wattr_on(view->window,
7515 			    COLOR_PAIR(tc->colorpair), NULL);
7516 		waddwstr(view->window, &wline[scrollx]);
7517 		if (tc)
7518 			wattr_off(view->window,
7519 			    COLOR_PAIR(tc->colorpair), NULL);
7520 		if (width < view->ncols)
7521 			waddch(view->window, '\n');
7522 		if (n == s->selected && view->focussed)
7523 			wstandend(view->window);
7524 		free(line);
7525 		free(wline);
7526 		wline = NULL;
7527 		n++;
7528 		s->ndisplayed++;
7529 		s->last_displayed_entry = te;
7530 		if (--limit <= 0)
7531 			break;
7532 	}
7533 
7534 	return err;
7535 }
7536 
7537 static void
7538 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7539 {
7540 	struct got_tree_entry *te;
7541 	int isroot = s->tree == s->root;
7542 	int i = 0;
7543 
7544 	if (s->first_displayed_entry == NULL)
7545 		return;
7546 
7547 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7548 	while (i++ < maxscroll) {
7549 		if (te == NULL) {
7550 			if (!isroot)
7551 				s->first_displayed_entry = NULL;
7552 			break;
7553 		}
7554 		s->first_displayed_entry = te;
7555 		te = got_tree_entry_get_prev(s->tree, te);
7556 	}
7557 }
7558 
7559 static const struct got_error *
7560 tree_scroll_down(struct tog_view *view, int maxscroll)
7561 {
7562 	struct tog_tree_view_state *s = &view->state.tree;
7563 	struct got_tree_entry *next, *last;
7564 	int n = 0;
7565 
7566 	if (s->first_displayed_entry)
7567 		next = got_tree_entry_get_next(s->tree,
7568 		    s->first_displayed_entry);
7569 	else
7570 		next = got_object_tree_get_first_entry(s->tree);
7571 
7572 	last = s->last_displayed_entry;
7573 	while (next && n++ < maxscroll) {
7574 		if (last) {
7575 			s->last_displayed_entry = last;
7576 			last = got_tree_entry_get_next(s->tree, last);
7577 		}
7578 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7579 			s->first_displayed_entry = next;
7580 			next = got_tree_entry_get_next(s->tree, next);
7581 		}
7582 	}
7583 
7584 	return NULL;
7585 }
7586 
7587 static const struct got_error *
7588 tree_entry_path(char **path, struct tog_parent_trees *parents,
7589     struct got_tree_entry *te)
7590 {
7591 	const struct got_error *err = NULL;
7592 	struct tog_parent_tree *pt;
7593 	size_t len = 2; /* for leading slash and NUL */
7594 
7595 	TAILQ_FOREACH(pt, parents, entry)
7596 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7597 		    + 1 /* slash */;
7598 	if (te)
7599 		len += strlen(got_tree_entry_get_name(te));
7600 
7601 	*path = calloc(1, len);
7602 	if (path == NULL)
7603 		return got_error_from_errno("calloc");
7604 
7605 	(*path)[0] = '/';
7606 	pt = TAILQ_LAST(parents, tog_parent_trees);
7607 	while (pt) {
7608 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7609 		if (strlcat(*path, name, len) >= len) {
7610 			err = got_error(GOT_ERR_NO_SPACE);
7611 			goto done;
7612 		}
7613 		if (strlcat(*path, "/", len) >= len) {
7614 			err = got_error(GOT_ERR_NO_SPACE);
7615 			goto done;
7616 		}
7617 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7618 	}
7619 	if (te) {
7620 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7621 			err = got_error(GOT_ERR_NO_SPACE);
7622 			goto done;
7623 		}
7624 	}
7625 done:
7626 	if (err) {
7627 		free(*path);
7628 		*path = NULL;
7629 	}
7630 	return err;
7631 }
7632 
7633 static const struct got_error *
7634 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7635     struct got_tree_entry *te, struct tog_parent_trees *parents,
7636     struct got_object_id *commit_id, struct got_repository *repo)
7637 {
7638 	const struct got_error *err = NULL;
7639 	char *path;
7640 	struct tog_view *blame_view;
7641 
7642 	*new_view = NULL;
7643 
7644 	err = tree_entry_path(&path, parents, te);
7645 	if (err)
7646 		return err;
7647 
7648 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7649 	if (blame_view == NULL) {
7650 		err = got_error_from_errno("view_open");
7651 		goto done;
7652 	}
7653 
7654 	err = open_blame_view(blame_view, path, commit_id, repo);
7655 	if (err) {
7656 		if (err->code == GOT_ERR_CANCELLED)
7657 			err = NULL;
7658 		view_close(blame_view);
7659 	} else
7660 		*new_view = blame_view;
7661 done:
7662 	free(path);
7663 	return err;
7664 }
7665 
7666 static const struct got_error *
7667 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7668     struct tog_tree_view_state *s)
7669 {
7670 	struct tog_view *log_view;
7671 	const struct got_error *err = NULL;
7672 	char *path;
7673 
7674 	*new_view = NULL;
7675 
7676 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7677 	if (log_view == NULL)
7678 		return got_error_from_errno("view_open");
7679 
7680 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7681 	if (err)
7682 		return err;
7683 
7684 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7685 	    path, 0, NULL);
7686 	if (err)
7687 		view_close(log_view);
7688 	else
7689 		*new_view = log_view;
7690 	free(path);
7691 	return err;
7692 }
7693 
7694 static const struct got_error *
7695 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7696     const char *head_ref_name, struct got_repository *repo)
7697 {
7698 	const struct got_error *err = NULL;
7699 	char *commit_id_str = NULL;
7700 	struct tog_tree_view_state *s = &view->state.tree;
7701 	struct got_commit_object *commit = NULL;
7702 
7703 	TAILQ_INIT(&s->parents);
7704 	STAILQ_INIT(&s->colors);
7705 
7706 	s->commit_id = got_object_id_dup(commit_id);
7707 	if (s->commit_id == NULL) {
7708 		err = got_error_from_errno("got_object_id_dup");
7709 		goto done;
7710 	}
7711 
7712 	err = got_object_open_as_commit(&commit, repo, commit_id);
7713 	if (err)
7714 		goto done;
7715 
7716 	/*
7717 	 * The root is opened here and will be closed when the view is closed.
7718 	 * Any visited subtrees and their path-wise parents are opened and
7719 	 * closed on demand.
7720 	 */
7721 	err = got_object_open_as_tree(&s->root, repo,
7722 	    got_object_commit_get_tree_id(commit));
7723 	if (err)
7724 		goto done;
7725 	s->tree = s->root;
7726 
7727 	err = got_object_id_str(&commit_id_str, commit_id);
7728 	if (err != NULL)
7729 		goto done;
7730 
7731 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7732 		err = got_error_from_errno("asprintf");
7733 		goto done;
7734 	}
7735 
7736 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7737 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7738 	if (head_ref_name) {
7739 		s->head_ref_name = strdup(head_ref_name);
7740 		if (s->head_ref_name == NULL) {
7741 			err = got_error_from_errno("strdup");
7742 			goto done;
7743 		}
7744 	}
7745 	s->repo = repo;
7746 
7747 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7748 		err = add_color(&s->colors, "\\$$",
7749 		    TOG_COLOR_TREE_SUBMODULE,
7750 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7751 		if (err)
7752 			goto done;
7753 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7754 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7755 		if (err)
7756 			goto done;
7757 		err = add_color(&s->colors, "/$",
7758 		    TOG_COLOR_TREE_DIRECTORY,
7759 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7760 		if (err)
7761 			goto done;
7762 
7763 		err = add_color(&s->colors, "\\*$",
7764 		    TOG_COLOR_TREE_EXECUTABLE,
7765 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7766 		if (err)
7767 			goto done;
7768 
7769 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7770 		    get_color_value("TOG_COLOR_COMMIT"));
7771 		if (err)
7772 			goto done;
7773 	}
7774 
7775 	view->show = show_tree_view;
7776 	view->input = input_tree_view;
7777 	view->close = close_tree_view;
7778 	view->search_start = search_start_tree_view;
7779 	view->search_next = search_next_tree_view;
7780 done:
7781 	free(commit_id_str);
7782 	if (commit)
7783 		got_object_commit_close(commit);
7784 	if (err) {
7785 		if (view->close == NULL)
7786 			close_tree_view(view);
7787 		view_close(view);
7788 	}
7789 	return err;
7790 }
7791 
7792 static const struct got_error *
7793 close_tree_view(struct tog_view *view)
7794 {
7795 	struct tog_tree_view_state *s = &view->state.tree;
7796 
7797 	free_colors(&s->colors);
7798 	free(s->tree_label);
7799 	s->tree_label = NULL;
7800 	free(s->commit_id);
7801 	s->commit_id = NULL;
7802 	free(s->head_ref_name);
7803 	s->head_ref_name = NULL;
7804 	while (!TAILQ_EMPTY(&s->parents)) {
7805 		struct tog_parent_tree *parent;
7806 		parent = TAILQ_FIRST(&s->parents);
7807 		TAILQ_REMOVE(&s->parents, parent, entry);
7808 		if (parent->tree != s->root)
7809 			got_object_tree_close(parent->tree);
7810 		free(parent);
7811 
7812 	}
7813 	if (s->tree != NULL && s->tree != s->root)
7814 		got_object_tree_close(s->tree);
7815 	if (s->root)
7816 		got_object_tree_close(s->root);
7817 	return NULL;
7818 }
7819 
7820 static const struct got_error *
7821 search_start_tree_view(struct tog_view *view)
7822 {
7823 	struct tog_tree_view_state *s = &view->state.tree;
7824 
7825 	s->matched_entry = NULL;
7826 	return NULL;
7827 }
7828 
7829 static int
7830 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7831 {
7832 	regmatch_t regmatch;
7833 
7834 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7835 	    0) == 0;
7836 }
7837 
7838 static const struct got_error *
7839 search_next_tree_view(struct tog_view *view)
7840 {
7841 	struct tog_tree_view_state *s = &view->state.tree;
7842 	struct got_tree_entry *te = NULL;
7843 
7844 	if (!view->searching) {
7845 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7846 		return NULL;
7847 	}
7848 
7849 	if (s->matched_entry) {
7850 		if (view->searching == TOG_SEARCH_FORWARD) {
7851 			if (s->selected_entry)
7852 				te = got_tree_entry_get_next(s->tree,
7853 				    s->selected_entry);
7854 			else
7855 				te = got_object_tree_get_first_entry(s->tree);
7856 		} else {
7857 			if (s->selected_entry == NULL)
7858 				te = got_object_tree_get_last_entry(s->tree);
7859 			else
7860 				te = got_tree_entry_get_prev(s->tree,
7861 				    s->selected_entry);
7862 		}
7863 	} else {
7864 		if (s->selected_entry)
7865 			te = s->selected_entry;
7866 		else if (view->searching == TOG_SEARCH_FORWARD)
7867 			te = got_object_tree_get_first_entry(s->tree);
7868 		else
7869 			te = got_object_tree_get_last_entry(s->tree);
7870 	}
7871 
7872 	while (1) {
7873 		if (te == NULL) {
7874 			if (s->matched_entry == NULL) {
7875 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7876 				return NULL;
7877 			}
7878 			if (view->searching == TOG_SEARCH_FORWARD)
7879 				te = got_object_tree_get_first_entry(s->tree);
7880 			else
7881 				te = got_object_tree_get_last_entry(s->tree);
7882 		}
7883 
7884 		if (match_tree_entry(te, &view->regex)) {
7885 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7886 			s->matched_entry = te;
7887 			break;
7888 		}
7889 
7890 		if (view->searching == TOG_SEARCH_FORWARD)
7891 			te = got_tree_entry_get_next(s->tree, te);
7892 		else
7893 			te = got_tree_entry_get_prev(s->tree, te);
7894 	}
7895 
7896 	if (s->matched_entry) {
7897 		s->first_displayed_entry = s->matched_entry;
7898 		s->selected = 0;
7899 	}
7900 
7901 	return NULL;
7902 }
7903 
7904 static const struct got_error *
7905 show_tree_view(struct tog_view *view)
7906 {
7907 	const struct got_error *err = NULL;
7908 	struct tog_tree_view_state *s = &view->state.tree;
7909 	char *parent_path;
7910 
7911 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7912 	if (err)
7913 		return err;
7914 
7915 	err = draw_tree_entries(view, parent_path);
7916 	free(parent_path);
7917 
7918 	view_border(view);
7919 	return err;
7920 }
7921 
7922 static const struct got_error *
7923 tree_goto_line(struct tog_view *view, int nlines)
7924 {
7925 	const struct got_error		 *err = NULL;
7926 	struct tog_tree_view_state	 *s = &view->state.tree;
7927 	struct got_tree_entry		**fte, **lte, **ste;
7928 	int				  g, last, first = 1, i = 1;
7929 	int				  root = s->tree == s->root;
7930 	int				  off = root ? 1 : 2;
7931 
7932 	g = view->gline;
7933 	view->gline = 0;
7934 
7935 	if (g == 0)
7936 		g = 1;
7937 	else if (g > got_object_tree_get_nentries(s->tree))
7938 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7939 
7940 	fte = &s->first_displayed_entry;
7941 	lte = &s->last_displayed_entry;
7942 	ste = &s->selected_entry;
7943 
7944 	if (*fte != NULL) {
7945 		first = got_tree_entry_get_index(*fte);
7946 		first += off;  /* account for ".." */
7947 	}
7948 	last = got_tree_entry_get_index(*lte);
7949 	last += off;
7950 
7951 	if (g >= first && g <= last && g - first < nlines) {
7952 		s->selected = g - first;
7953 		return NULL;	/* gline is on the current page */
7954 	}
7955 
7956 	if (*ste != NULL) {
7957 		i = got_tree_entry_get_index(*ste);
7958 		i += off;
7959 	}
7960 
7961 	if (i < g) {
7962 		err = tree_scroll_down(view, g - i);
7963 		if (err)
7964 			return err;
7965 		if (got_tree_entry_get_index(*lte) >=
7966 		    got_object_tree_get_nentries(s->tree) - 1 &&
7967 		    first + s->selected < g &&
7968 		    s->selected < s->ndisplayed - 1) {
7969 			first = got_tree_entry_get_index(*fte);
7970 			first += off;
7971 			s->selected = g - first;
7972 		}
7973 	} else if (i > g)
7974 		tree_scroll_up(s, i - g);
7975 
7976 	if (g < nlines &&
7977 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7978 		s->selected = g - 1;
7979 
7980 	return NULL;
7981 }
7982 
7983 static const struct got_error *
7984 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7985 {
7986 	const struct got_error *err = NULL;
7987 	struct tog_tree_view_state *s = &view->state.tree;
7988 	struct got_tree_entry *te;
7989 	int n, nscroll = view->nlines - 3;
7990 
7991 	if (view->gline)
7992 		return tree_goto_line(view, nscroll);
7993 
7994 	switch (ch) {
7995 	case '0':
7996 	case '$':
7997 	case KEY_RIGHT:
7998 	case 'l':
7999 	case KEY_LEFT:
8000 	case 'h':
8001 		horizontal_scroll_input(view, ch);
8002 		break;
8003 	case 'i':
8004 		s->show_ids = !s->show_ids;
8005 		view->count = 0;
8006 		break;
8007 	case 'L':
8008 		view->count = 0;
8009 		if (!s->selected_entry)
8010 			break;
8011 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8012 		break;
8013 	case 'R':
8014 		view->count = 0;
8015 		err = view_request_new(new_view, view, TOG_VIEW_REF);
8016 		break;
8017 	case 'g':
8018 	case '=':
8019 	case KEY_HOME:
8020 		s->selected = 0;
8021 		view->count = 0;
8022 		if (s->tree == s->root)
8023 			s->first_displayed_entry =
8024 			    got_object_tree_get_first_entry(s->tree);
8025 		else
8026 			s->first_displayed_entry = NULL;
8027 		break;
8028 	case 'G':
8029 	case '*':
8030 	case KEY_END: {
8031 		int eos = view->nlines - 3;
8032 
8033 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8034 			--eos;  /* border */
8035 		s->selected = 0;
8036 		view->count = 0;
8037 		te = got_object_tree_get_last_entry(s->tree);
8038 		for (n = 0; n < eos; n++) {
8039 			if (te == NULL) {
8040 				if (s->tree != s->root) {
8041 					s->first_displayed_entry = NULL;
8042 					n++;
8043 				}
8044 				break;
8045 			}
8046 			s->first_displayed_entry = te;
8047 			te = got_tree_entry_get_prev(s->tree, te);
8048 		}
8049 		if (n > 0)
8050 			s->selected = n - 1;
8051 		break;
8052 	}
8053 	case 'k':
8054 	case KEY_UP:
8055 	case CTRL('p'):
8056 		if (s->selected > 0) {
8057 			s->selected--;
8058 			break;
8059 		}
8060 		tree_scroll_up(s, 1);
8061 		if (s->selected_entry == NULL ||
8062 		    (s->tree == s->root && s->selected_entry ==
8063 		     got_object_tree_get_first_entry(s->tree)))
8064 			view->count = 0;
8065 		break;
8066 	case CTRL('u'):
8067 	case 'u':
8068 		nscroll /= 2;
8069 		/* FALL THROUGH */
8070 	case KEY_PPAGE:
8071 	case CTRL('b'):
8072 	case 'b':
8073 		if (s->tree == s->root) {
8074 			if (got_object_tree_get_first_entry(s->tree) ==
8075 			    s->first_displayed_entry)
8076 				s->selected -= MIN(s->selected, nscroll);
8077 		} else {
8078 			if (s->first_displayed_entry == NULL)
8079 				s->selected -= MIN(s->selected, nscroll);
8080 		}
8081 		tree_scroll_up(s, MAX(0, nscroll));
8082 		if (s->selected_entry == NULL ||
8083 		    (s->tree == s->root && s->selected_entry ==
8084 		     got_object_tree_get_first_entry(s->tree)))
8085 			view->count = 0;
8086 		break;
8087 	case 'j':
8088 	case KEY_DOWN:
8089 	case CTRL('n'):
8090 		if (s->selected < s->ndisplayed - 1) {
8091 			s->selected++;
8092 			break;
8093 		}
8094 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8095 		    == NULL) {
8096 			/* can't scroll any further */
8097 			view->count = 0;
8098 			break;
8099 		}
8100 		tree_scroll_down(view, 1);
8101 		break;
8102 	case CTRL('d'):
8103 	case 'd':
8104 		nscroll /= 2;
8105 		/* FALL THROUGH */
8106 	case KEY_NPAGE:
8107 	case CTRL('f'):
8108 	case 'f':
8109 	case ' ':
8110 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8111 		    == NULL) {
8112 			/* can't scroll any further; move cursor down */
8113 			if (s->selected < s->ndisplayed - 1)
8114 				s->selected += MIN(nscroll,
8115 				    s->ndisplayed - s->selected - 1);
8116 			else
8117 				view->count = 0;
8118 			break;
8119 		}
8120 		tree_scroll_down(view, nscroll);
8121 		break;
8122 	case KEY_ENTER:
8123 	case '\r':
8124 	case KEY_BACKSPACE:
8125 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8126 			struct tog_parent_tree *parent;
8127 			/* user selected '..' */
8128 			if (s->tree == s->root) {
8129 				view->count = 0;
8130 				break;
8131 			}
8132 			parent = TAILQ_FIRST(&s->parents);
8133 			TAILQ_REMOVE(&s->parents, parent,
8134 			    entry);
8135 			got_object_tree_close(s->tree);
8136 			s->tree = parent->tree;
8137 			s->first_displayed_entry =
8138 			    parent->first_displayed_entry;
8139 			s->selected_entry =
8140 			    parent->selected_entry;
8141 			s->selected = parent->selected;
8142 			if (s->selected > view->nlines - 3) {
8143 				err = offset_selection_down(view);
8144 				if (err)
8145 					break;
8146 			}
8147 			free(parent);
8148 		} else if (S_ISDIR(got_tree_entry_get_mode(
8149 		    s->selected_entry))) {
8150 			struct got_tree_object *subtree;
8151 			view->count = 0;
8152 			err = got_object_open_as_tree(&subtree, s->repo,
8153 			    got_tree_entry_get_id(s->selected_entry));
8154 			if (err)
8155 				break;
8156 			err = tree_view_visit_subtree(s, subtree);
8157 			if (err) {
8158 				got_object_tree_close(subtree);
8159 				break;
8160 			}
8161 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8162 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8163 		break;
8164 	case KEY_RESIZE:
8165 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8166 			s->selected = view->nlines - 4;
8167 		view->count = 0;
8168 		break;
8169 	default:
8170 		view->count = 0;
8171 		break;
8172 	}
8173 
8174 	return err;
8175 }
8176 
8177 __dead static void
8178 usage_tree(void)
8179 {
8180 	endwin();
8181 	fprintf(stderr,
8182 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8183 	    getprogname());
8184 	exit(1);
8185 }
8186 
8187 static const struct got_error *
8188 cmd_tree(int argc, char *argv[])
8189 {
8190 	const struct got_error *error;
8191 	struct got_repository *repo = NULL;
8192 	struct got_worktree *worktree = NULL;
8193 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8194 	struct got_object_id *commit_id = NULL;
8195 	struct got_commit_object *commit = NULL;
8196 	const char *commit_id_arg = NULL;
8197 	char *keyword_idstr = NULL, *label = NULL;
8198 	struct got_reference *ref = NULL;
8199 	const char *head_ref_name = NULL;
8200 	int ch;
8201 	struct tog_view *view;
8202 	int *pack_fds = NULL;
8203 
8204 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8205 		switch (ch) {
8206 		case 'c':
8207 			commit_id_arg = optarg;
8208 			break;
8209 		case 'r':
8210 			repo_path = realpath(optarg, NULL);
8211 			if (repo_path == NULL)
8212 				return got_error_from_errno2("realpath",
8213 				    optarg);
8214 			break;
8215 		default:
8216 			usage_tree();
8217 			/* NOTREACHED */
8218 		}
8219 	}
8220 
8221 	argc -= optind;
8222 	argv += optind;
8223 
8224 	if (argc > 1)
8225 		usage_tree();
8226 
8227 	error = got_repo_pack_fds_open(&pack_fds);
8228 	if (error != NULL)
8229 		goto done;
8230 
8231 	if (repo_path == NULL) {
8232 		cwd = getcwd(NULL, 0);
8233 		if (cwd == NULL)
8234 			return got_error_from_errno("getcwd");
8235 		error = got_worktree_open(&worktree, cwd, NULL);
8236 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8237 			goto done;
8238 		if (worktree)
8239 			repo_path =
8240 			    strdup(got_worktree_get_repo_path(worktree));
8241 		else
8242 			repo_path = strdup(cwd);
8243 		if (repo_path == NULL) {
8244 			error = got_error_from_errno("strdup");
8245 			goto done;
8246 		}
8247 	}
8248 
8249 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8250 	if (error != NULL)
8251 		goto done;
8252 
8253 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8254 	    repo, worktree);
8255 	if (error)
8256 		goto done;
8257 
8258 	init_curses();
8259 
8260 	error = apply_unveil(got_repo_get_path(repo), NULL);
8261 	if (error)
8262 		goto done;
8263 
8264 	error = tog_load_refs(repo, 0);
8265 	if (error)
8266 		goto done;
8267 
8268 	if (commit_id_arg == NULL) {
8269 		error = got_repo_match_object_id(&commit_id, &label,
8270 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8271 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8272 		if (error)
8273 			goto done;
8274 		head_ref_name = label;
8275 	} else {
8276 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8277 		    repo, worktree);
8278 		if (error != NULL)
8279 			goto done;
8280 		if (keyword_idstr != NULL)
8281 			commit_id_arg = keyword_idstr;
8282 
8283 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8284 		if (error == NULL)
8285 			head_ref_name = got_ref_get_name(ref);
8286 		else if (error->code != GOT_ERR_NOT_REF)
8287 			goto done;
8288 		error = got_repo_match_object_id(&commit_id, NULL,
8289 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8290 		if (error)
8291 			goto done;
8292 	}
8293 
8294 	error = got_object_open_as_commit(&commit, repo, commit_id);
8295 	if (error)
8296 		goto done;
8297 
8298 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8299 	if (view == NULL) {
8300 		error = got_error_from_errno("view_open");
8301 		goto done;
8302 	}
8303 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8304 	if (error)
8305 		goto done;
8306 	if (!got_path_is_root_dir(in_repo_path)) {
8307 		error = tree_view_walk_path(&view->state.tree, commit,
8308 		    in_repo_path);
8309 		if (error)
8310 			goto done;
8311 	}
8312 
8313 	if (worktree) {
8314 		error = set_tog_base_commit(repo, worktree);
8315 		if (error != NULL)
8316 			goto done;
8317 
8318 		/* Release work tree lock. */
8319 		got_worktree_close(worktree);
8320 		worktree = NULL;
8321 	}
8322 
8323 	error = view_loop(view);
8324 
8325 done:
8326 	free(tog_base_commit.id);
8327 	free(keyword_idstr);
8328 	free(repo_path);
8329 	free(cwd);
8330 	free(commit_id);
8331 	free(label);
8332 	if (ref)
8333 		got_ref_close(ref);
8334 	if (worktree != NULL)
8335 		got_worktree_close(worktree);
8336 	if (repo) {
8337 		const struct got_error *close_err = got_repo_close(repo);
8338 		if (error == NULL)
8339 			error = close_err;
8340 	}
8341 	if (pack_fds) {
8342 		const struct got_error *pack_err =
8343 		    got_repo_pack_fds_close(pack_fds);
8344 		if (error == NULL)
8345 			error = pack_err;
8346 	}
8347 	tog_free_refs();
8348 	return error;
8349 }
8350 
8351 static const struct got_error *
8352 ref_view_load_refs(struct tog_ref_view_state *s)
8353 {
8354 	struct got_reflist_entry *sre;
8355 	struct tog_reflist_entry *re;
8356 
8357 	s->nrefs = 0;
8358 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8359 		if (strncmp(got_ref_get_name(sre->ref),
8360 		    "refs/got/", 9) == 0 &&
8361 		    strncmp(got_ref_get_name(sre->ref),
8362 		    "refs/got/backup/", 16) != 0)
8363 			continue;
8364 
8365 		re = malloc(sizeof(*re));
8366 		if (re == NULL)
8367 			return got_error_from_errno("malloc");
8368 
8369 		re->ref = got_ref_dup(sre->ref);
8370 		if (re->ref == NULL)
8371 			return got_error_from_errno("got_ref_dup");
8372 		re->idx = s->nrefs++;
8373 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8374 	}
8375 
8376 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8377 	return NULL;
8378 }
8379 
8380 static void
8381 ref_view_free_refs(struct tog_ref_view_state *s)
8382 {
8383 	struct tog_reflist_entry *re;
8384 
8385 	while (!TAILQ_EMPTY(&s->refs)) {
8386 		re = TAILQ_FIRST(&s->refs);
8387 		TAILQ_REMOVE(&s->refs, re, entry);
8388 		got_ref_close(re->ref);
8389 		free(re);
8390 	}
8391 }
8392 
8393 static const struct got_error *
8394 open_ref_view(struct tog_view *view, struct got_repository *repo)
8395 {
8396 	const struct got_error *err = NULL;
8397 	struct tog_ref_view_state *s = &view->state.ref;
8398 
8399 	s->selected_entry = 0;
8400 	s->repo = repo;
8401 
8402 	TAILQ_INIT(&s->refs);
8403 	STAILQ_INIT(&s->colors);
8404 
8405 	err = ref_view_load_refs(s);
8406 	if (err)
8407 		goto done;
8408 
8409 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8410 		err = add_color(&s->colors, "^refs/heads/",
8411 		    TOG_COLOR_REFS_HEADS,
8412 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8413 		if (err)
8414 			goto done;
8415 
8416 		err = add_color(&s->colors, "^refs/tags/",
8417 		    TOG_COLOR_REFS_TAGS,
8418 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8419 		if (err)
8420 			goto done;
8421 
8422 		err = add_color(&s->colors, "^refs/remotes/",
8423 		    TOG_COLOR_REFS_REMOTES,
8424 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8425 		if (err)
8426 			goto done;
8427 
8428 		err = add_color(&s->colors, "^refs/got/backup/",
8429 		    TOG_COLOR_REFS_BACKUP,
8430 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8431 		if (err)
8432 			goto done;
8433 	}
8434 
8435 	view->show = show_ref_view;
8436 	view->input = input_ref_view;
8437 	view->close = close_ref_view;
8438 	view->search_start = search_start_ref_view;
8439 	view->search_next = search_next_ref_view;
8440 done:
8441 	if (err) {
8442 		if (view->close == NULL)
8443 			close_ref_view(view);
8444 		view_close(view);
8445 	}
8446 	return err;
8447 }
8448 
8449 static const struct got_error *
8450 close_ref_view(struct tog_view *view)
8451 {
8452 	struct tog_ref_view_state *s = &view->state.ref;
8453 
8454 	ref_view_free_refs(s);
8455 	free_colors(&s->colors);
8456 
8457 	return NULL;
8458 }
8459 
8460 static const struct got_error *
8461 resolve_reflist_entry(struct got_object_id **commit_id,
8462     struct tog_reflist_entry *re, struct got_repository *repo)
8463 {
8464 	const struct got_error *err = NULL;
8465 	struct got_object_id *obj_id;
8466 	struct got_tag_object *tag = NULL;
8467 	int obj_type;
8468 
8469 	*commit_id = NULL;
8470 
8471 	err = got_ref_resolve(&obj_id, repo, re->ref);
8472 	if (err)
8473 		return err;
8474 
8475 	err = got_object_get_type(&obj_type, repo, obj_id);
8476 	if (err)
8477 		goto done;
8478 
8479 	switch (obj_type) {
8480 	case GOT_OBJ_TYPE_COMMIT:
8481 		*commit_id = obj_id;
8482 		break;
8483 	case GOT_OBJ_TYPE_TAG:
8484 		err = got_object_open_as_tag(&tag, repo, obj_id);
8485 		if (err)
8486 			goto done;
8487 		free(obj_id);
8488 		err = got_object_get_type(&obj_type, repo,
8489 		    got_object_tag_get_object_id(tag));
8490 		if (err)
8491 			goto done;
8492 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8493 			err = got_error(GOT_ERR_OBJ_TYPE);
8494 			goto done;
8495 		}
8496 		*commit_id = got_object_id_dup(
8497 		    got_object_tag_get_object_id(tag));
8498 		if (*commit_id == NULL) {
8499 			err = got_error_from_errno("got_object_id_dup");
8500 			goto done;
8501 		}
8502 		break;
8503 	default:
8504 		err = got_error(GOT_ERR_OBJ_TYPE);
8505 		break;
8506 	}
8507 
8508 done:
8509 	if (tag)
8510 		got_object_tag_close(tag);
8511 	if (err) {
8512 		free(*commit_id);
8513 		*commit_id = NULL;
8514 	}
8515 	return err;
8516 }
8517 
8518 static const struct got_error *
8519 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8520     struct tog_reflist_entry *re, struct got_repository *repo)
8521 {
8522 	struct tog_view *log_view;
8523 	const struct got_error *err = NULL;
8524 	struct got_object_id *commit_id = NULL;
8525 
8526 	*new_view = NULL;
8527 
8528 	err = resolve_reflist_entry(&commit_id, re, repo);
8529 	if (err) {
8530 		if (err->code != GOT_ERR_OBJ_TYPE)
8531 			return err;
8532 		else
8533 			return NULL;
8534 	}
8535 
8536 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8537 	if (log_view == NULL) {
8538 		err = got_error_from_errno("view_open");
8539 		goto done;
8540 	}
8541 
8542 	err = open_log_view(log_view, commit_id, repo,
8543 	    got_ref_get_name(re->ref), "", 0, NULL);
8544 done:
8545 	if (err)
8546 		view_close(log_view);
8547 	else
8548 		*new_view = log_view;
8549 	free(commit_id);
8550 	return err;
8551 }
8552 
8553 static void
8554 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8555 {
8556 	struct tog_reflist_entry *re;
8557 	int i = 0;
8558 
8559 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8560 		return;
8561 
8562 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8563 	while (i++ < maxscroll) {
8564 		if (re == NULL)
8565 			break;
8566 		s->first_displayed_entry = re;
8567 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8568 	}
8569 }
8570 
8571 static const struct got_error *
8572 ref_scroll_down(struct tog_view *view, int maxscroll)
8573 {
8574 	struct tog_ref_view_state *s = &view->state.ref;
8575 	struct tog_reflist_entry *next, *last;
8576 	int n = 0;
8577 
8578 	if (s->first_displayed_entry)
8579 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8580 	else
8581 		next = TAILQ_FIRST(&s->refs);
8582 
8583 	last = s->last_displayed_entry;
8584 	while (next && n++ < maxscroll) {
8585 		if (last) {
8586 			s->last_displayed_entry = last;
8587 			last = TAILQ_NEXT(last, entry);
8588 		}
8589 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8590 			s->first_displayed_entry = next;
8591 			next = TAILQ_NEXT(next, entry);
8592 		}
8593 	}
8594 
8595 	return NULL;
8596 }
8597 
8598 static const struct got_error *
8599 search_start_ref_view(struct tog_view *view)
8600 {
8601 	struct tog_ref_view_state *s = &view->state.ref;
8602 
8603 	s->matched_entry = NULL;
8604 	return NULL;
8605 }
8606 
8607 static int
8608 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8609 {
8610 	regmatch_t regmatch;
8611 
8612 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8613 	    0) == 0;
8614 }
8615 
8616 static const struct got_error *
8617 search_next_ref_view(struct tog_view *view)
8618 {
8619 	struct tog_ref_view_state *s = &view->state.ref;
8620 	struct tog_reflist_entry *re = NULL;
8621 
8622 	if (!view->searching) {
8623 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8624 		return NULL;
8625 	}
8626 
8627 	if (s->matched_entry) {
8628 		if (view->searching == TOG_SEARCH_FORWARD) {
8629 			if (s->selected_entry)
8630 				re = TAILQ_NEXT(s->selected_entry, entry);
8631 			else
8632 				re = TAILQ_PREV(s->selected_entry,
8633 				    tog_reflist_head, entry);
8634 		} else {
8635 			if (s->selected_entry == NULL)
8636 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8637 			else
8638 				re = TAILQ_PREV(s->selected_entry,
8639 				    tog_reflist_head, entry);
8640 		}
8641 	} else {
8642 		if (s->selected_entry)
8643 			re = s->selected_entry;
8644 		else if (view->searching == TOG_SEARCH_FORWARD)
8645 			re = TAILQ_FIRST(&s->refs);
8646 		else
8647 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8648 	}
8649 
8650 	while (1) {
8651 		if (re == NULL) {
8652 			if (s->matched_entry == NULL) {
8653 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8654 				return NULL;
8655 			}
8656 			if (view->searching == TOG_SEARCH_FORWARD)
8657 				re = TAILQ_FIRST(&s->refs);
8658 			else
8659 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8660 		}
8661 
8662 		if (match_reflist_entry(re, &view->regex)) {
8663 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8664 			s->matched_entry = re;
8665 			break;
8666 		}
8667 
8668 		if (view->searching == TOG_SEARCH_FORWARD)
8669 			re = TAILQ_NEXT(re, entry);
8670 		else
8671 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8672 	}
8673 
8674 	if (s->matched_entry) {
8675 		s->first_displayed_entry = s->matched_entry;
8676 		s->selected = 0;
8677 	}
8678 
8679 	return NULL;
8680 }
8681 
8682 static const struct got_error *
8683 show_ref_view(struct tog_view *view)
8684 {
8685 	const struct got_error *err = NULL;
8686 	struct tog_ref_view_state *s = &view->state.ref;
8687 	struct tog_reflist_entry *re;
8688 	char *line = NULL;
8689 	wchar_t *wline;
8690 	struct tog_color *tc;
8691 	int width, n, scrollx;
8692 	int limit = view->nlines;
8693 
8694 	werase(view->window);
8695 
8696 	s->ndisplayed = 0;
8697 	if (view_is_hsplit_top(view))
8698 		--limit;  /* border */
8699 
8700 	if (limit == 0)
8701 		return NULL;
8702 
8703 	re = s->first_displayed_entry;
8704 
8705 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8706 	    s->nrefs) == -1)
8707 		return got_error_from_errno("asprintf");
8708 
8709 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8710 	if (err) {
8711 		free(line);
8712 		return err;
8713 	}
8714 	if (view_needs_focus_indication(view))
8715 		wstandout(view->window);
8716 	waddwstr(view->window, wline);
8717 	while (width++ < view->ncols)
8718 		waddch(view->window, ' ');
8719 	if (view_needs_focus_indication(view))
8720 		wstandend(view->window);
8721 	free(wline);
8722 	wline = NULL;
8723 	free(line);
8724 	line = NULL;
8725 	if (--limit <= 0)
8726 		return NULL;
8727 
8728 	n = 0;
8729 	view->maxx = 0;
8730 	while (re && limit > 0) {
8731 		char *line = NULL;
8732 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8733 
8734 		if (s->show_date) {
8735 			struct got_commit_object *ci;
8736 			struct got_tag_object *tag;
8737 			struct got_object_id *id;
8738 			struct tm tm;
8739 			time_t t;
8740 
8741 			err = got_ref_resolve(&id, s->repo, re->ref);
8742 			if (err)
8743 				return err;
8744 			err = got_object_open_as_tag(&tag, s->repo, id);
8745 			if (err) {
8746 				if (err->code != GOT_ERR_OBJ_TYPE) {
8747 					free(id);
8748 					return err;
8749 				}
8750 				err = got_object_open_as_commit(&ci, s->repo,
8751 				    id);
8752 				if (err) {
8753 					free(id);
8754 					return err;
8755 				}
8756 				t = got_object_commit_get_committer_time(ci);
8757 				got_object_commit_close(ci);
8758 			} else {
8759 				t = got_object_tag_get_tagger_time(tag);
8760 				got_object_tag_close(tag);
8761 			}
8762 			free(id);
8763 			if (gmtime_r(&t, &tm) == NULL)
8764 				return got_error_from_errno("gmtime_r");
8765 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8766 				return got_error(GOT_ERR_NO_SPACE);
8767 		}
8768 		if (got_ref_is_symbolic(re->ref)) {
8769 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8770 			    ymd : "", got_ref_get_name(re->ref),
8771 			    got_ref_get_symref_target(re->ref)) == -1)
8772 				return got_error_from_errno("asprintf");
8773 		} else if (s->show_ids) {
8774 			struct got_object_id *id;
8775 			char *id_str;
8776 			err = got_ref_resolve(&id, s->repo, re->ref);
8777 			if (err)
8778 				return err;
8779 			err = got_object_id_str(&id_str, id);
8780 			if (err) {
8781 				free(id);
8782 				return err;
8783 			}
8784 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8785 			    got_ref_get_name(re->ref), id_str) == -1) {
8786 				err = got_error_from_errno("asprintf");
8787 				free(id);
8788 				free(id_str);
8789 				return err;
8790 			}
8791 			free(id);
8792 			free(id_str);
8793 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8794 		    got_ref_get_name(re->ref)) == -1)
8795 			return got_error_from_errno("asprintf");
8796 
8797 		/* use full line width to determine view->maxx */
8798 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8799 		if (err) {
8800 			free(line);
8801 			return err;
8802 		}
8803 		view->maxx = MAX(view->maxx, width);
8804 		free(wline);
8805 		wline = NULL;
8806 
8807 		err = format_line(&wline, &width, &scrollx, line, view->x,
8808 		    view->ncols, 0, 0);
8809 		if (err) {
8810 			free(line);
8811 			return err;
8812 		}
8813 		if (n == s->selected) {
8814 			if (view->focussed)
8815 				wstandout(view->window);
8816 			s->selected_entry = re;
8817 		}
8818 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8819 		if (tc)
8820 			wattr_on(view->window,
8821 			    COLOR_PAIR(tc->colorpair), NULL);
8822 		waddwstr(view->window, &wline[scrollx]);
8823 		if (tc)
8824 			wattr_off(view->window,
8825 			    COLOR_PAIR(tc->colorpair), NULL);
8826 		if (width < view->ncols)
8827 			waddch(view->window, '\n');
8828 		if (n == s->selected && view->focussed)
8829 			wstandend(view->window);
8830 		free(line);
8831 		free(wline);
8832 		wline = NULL;
8833 		n++;
8834 		s->ndisplayed++;
8835 		s->last_displayed_entry = re;
8836 
8837 		limit--;
8838 		re = TAILQ_NEXT(re, entry);
8839 	}
8840 
8841 	view_border(view);
8842 	return err;
8843 }
8844 
8845 static const struct got_error *
8846 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8847     struct tog_reflist_entry *re, struct got_repository *repo)
8848 {
8849 	const struct got_error *err = NULL;
8850 	struct got_object_id *commit_id = NULL;
8851 	struct tog_view *tree_view;
8852 
8853 	*new_view = NULL;
8854 
8855 	err = resolve_reflist_entry(&commit_id, re, repo);
8856 	if (err) {
8857 		if (err->code != GOT_ERR_OBJ_TYPE)
8858 			return err;
8859 		else
8860 			return NULL;
8861 	}
8862 
8863 
8864 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8865 	if (tree_view == NULL) {
8866 		err = got_error_from_errno("view_open");
8867 		goto done;
8868 	}
8869 
8870 	err = open_tree_view(tree_view, commit_id,
8871 	    got_ref_get_name(re->ref), repo);
8872 	if (err)
8873 		goto done;
8874 
8875 	*new_view = tree_view;
8876 done:
8877 	free(commit_id);
8878 	return err;
8879 }
8880 
8881 static const struct got_error *
8882 ref_goto_line(struct tog_view *view, int nlines)
8883 {
8884 	const struct got_error		*err = NULL;
8885 	struct tog_ref_view_state	*s = &view->state.ref;
8886 	int				 g, idx = s->selected_entry->idx;
8887 
8888 	g = view->gline;
8889 	view->gline = 0;
8890 
8891 	if (g == 0)
8892 		g = 1;
8893 	else if (g > s->nrefs)
8894 		g = s->nrefs;
8895 
8896 	if (g >= s->first_displayed_entry->idx + 1 &&
8897 	    g <= s->last_displayed_entry->idx + 1 &&
8898 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8899 		s->selected = g - s->first_displayed_entry->idx - 1;
8900 		return NULL;
8901 	}
8902 
8903 	if (idx + 1 < g) {
8904 		err = ref_scroll_down(view, g - idx - 1);
8905 		if (err)
8906 			return err;
8907 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8908 		    s->first_displayed_entry->idx + s->selected < g &&
8909 		    s->selected < s->ndisplayed - 1)
8910 			s->selected = g - s->first_displayed_entry->idx - 1;
8911 	} else if (idx + 1 > g)
8912 		ref_scroll_up(s, idx - g + 1);
8913 
8914 	if (g < nlines && s->first_displayed_entry->idx == 0)
8915 		s->selected = g - 1;
8916 
8917 	return NULL;
8918 
8919 }
8920 
8921 static const struct got_error *
8922 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8923 {
8924 	const struct got_error *err = NULL;
8925 	struct tog_ref_view_state *s = &view->state.ref;
8926 	struct tog_reflist_entry *re;
8927 	int n, nscroll = view->nlines - 1;
8928 
8929 	if (view->gline)
8930 		return ref_goto_line(view, nscroll);
8931 
8932 	switch (ch) {
8933 	case '0':
8934 	case '$':
8935 	case KEY_RIGHT:
8936 	case 'l':
8937 	case KEY_LEFT:
8938 	case 'h':
8939 		horizontal_scroll_input(view, ch);
8940 		break;
8941 	case 'i':
8942 		s->show_ids = !s->show_ids;
8943 		view->count = 0;
8944 		break;
8945 	case 'm':
8946 		s->show_date = !s->show_date;
8947 		view->count = 0;
8948 		break;
8949 	case 'o':
8950 		s->sort_by_date = !s->sort_by_date;
8951 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8952 		view->count = 0;
8953 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8954 		    got_ref_cmp_by_commit_timestamp_descending :
8955 		    tog_ref_cmp_by_name, s->repo);
8956 		if (err)
8957 			break;
8958 		got_reflist_object_id_map_free(tog_refs_idmap);
8959 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8960 		    &tog_refs, s->repo);
8961 		if (err)
8962 			break;
8963 		ref_view_free_refs(s);
8964 		err = ref_view_load_refs(s);
8965 		break;
8966 	case KEY_ENTER:
8967 	case '\r':
8968 		view->count = 0;
8969 		if (!s->selected_entry)
8970 			break;
8971 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8972 		break;
8973 	case 'T':
8974 		view->count = 0;
8975 		if (!s->selected_entry)
8976 			break;
8977 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8978 		break;
8979 	case 'g':
8980 	case '=':
8981 	case KEY_HOME:
8982 		s->selected = 0;
8983 		view->count = 0;
8984 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8985 		break;
8986 	case 'G':
8987 	case '*':
8988 	case KEY_END: {
8989 		int eos = view->nlines - 1;
8990 
8991 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8992 			--eos;  /* border */
8993 		s->selected = 0;
8994 		view->count = 0;
8995 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8996 		for (n = 0; n < eos; n++) {
8997 			if (re == NULL)
8998 				break;
8999 			s->first_displayed_entry = re;
9000 			re = TAILQ_PREV(re, tog_reflist_head, entry);
9001 		}
9002 		if (n > 0)
9003 			s->selected = n - 1;
9004 		break;
9005 	}
9006 	case 'k':
9007 	case KEY_UP:
9008 	case CTRL('p'):
9009 		if (s->selected > 0) {
9010 			s->selected--;
9011 			break;
9012 		}
9013 		ref_scroll_up(s, 1);
9014 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9015 			view->count = 0;
9016 		break;
9017 	case CTRL('u'):
9018 	case 'u':
9019 		nscroll /= 2;
9020 		/* FALL THROUGH */
9021 	case KEY_PPAGE:
9022 	case CTRL('b'):
9023 	case 'b':
9024 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
9025 			s->selected -= MIN(nscroll, s->selected);
9026 		ref_scroll_up(s, MAX(0, nscroll));
9027 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
9028 			view->count = 0;
9029 		break;
9030 	case 'j':
9031 	case KEY_DOWN:
9032 	case CTRL('n'):
9033 		if (s->selected < s->ndisplayed - 1) {
9034 			s->selected++;
9035 			break;
9036 		}
9037 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9038 			/* can't scroll any further */
9039 			view->count = 0;
9040 			break;
9041 		}
9042 		ref_scroll_down(view, 1);
9043 		break;
9044 	case CTRL('d'):
9045 	case 'd':
9046 		nscroll /= 2;
9047 		/* FALL THROUGH */
9048 	case KEY_NPAGE:
9049 	case CTRL('f'):
9050 	case 'f':
9051 	case ' ':
9052 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
9053 			/* can't scroll any further; move cursor down */
9054 			if (s->selected < s->ndisplayed - 1)
9055 				s->selected += MIN(nscroll,
9056 				    s->ndisplayed - s->selected - 1);
9057 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
9058 				s->selected += s->ndisplayed - s->selected - 1;
9059 			view->count = 0;
9060 			break;
9061 		}
9062 		ref_scroll_down(view, nscroll);
9063 		break;
9064 	case CTRL('l'):
9065 		view->count = 0;
9066 		tog_free_refs();
9067 		err = tog_load_refs(s->repo, s->sort_by_date);
9068 		if (err)
9069 			break;
9070 		ref_view_free_refs(s);
9071 		err = ref_view_load_refs(s);
9072 		break;
9073 	case KEY_RESIZE:
9074 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9075 			s->selected = view->nlines - 2;
9076 		break;
9077 	default:
9078 		view->count = 0;
9079 		break;
9080 	}
9081 
9082 	return err;
9083 }
9084 
9085 __dead static void
9086 usage_ref(void)
9087 {
9088 	endwin();
9089 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9090 	    getprogname());
9091 	exit(1);
9092 }
9093 
9094 static const struct got_error *
9095 cmd_ref(int argc, char *argv[])
9096 {
9097 	const struct got_error *error;
9098 	struct got_repository *repo = NULL;
9099 	struct got_worktree *worktree = NULL;
9100 	char *cwd = NULL, *repo_path = NULL;
9101 	int ch;
9102 	struct tog_view *view;
9103 	int *pack_fds = NULL;
9104 
9105 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9106 		switch (ch) {
9107 		case 'r':
9108 			repo_path = realpath(optarg, NULL);
9109 			if (repo_path == NULL)
9110 				return got_error_from_errno2("realpath",
9111 				    optarg);
9112 			break;
9113 		default:
9114 			usage_ref();
9115 			/* NOTREACHED */
9116 		}
9117 	}
9118 
9119 	argc -= optind;
9120 	argv += optind;
9121 
9122 	if (argc > 1)
9123 		usage_ref();
9124 
9125 	error = got_repo_pack_fds_open(&pack_fds);
9126 	if (error != NULL)
9127 		goto done;
9128 
9129 	if (repo_path == NULL) {
9130 		cwd = getcwd(NULL, 0);
9131 		if (cwd == NULL)
9132 			return got_error_from_errno("getcwd");
9133 		error = got_worktree_open(&worktree, cwd, NULL);
9134 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9135 			goto done;
9136 		if (worktree)
9137 			repo_path =
9138 			    strdup(got_worktree_get_repo_path(worktree));
9139 		else
9140 			repo_path = strdup(cwd);
9141 		if (repo_path == NULL) {
9142 			error = got_error_from_errno("strdup");
9143 			goto done;
9144 		}
9145 	}
9146 
9147 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9148 	if (error != NULL)
9149 		goto done;
9150 
9151 	init_curses();
9152 
9153 	error = apply_unveil(got_repo_get_path(repo), NULL);
9154 	if (error)
9155 		goto done;
9156 
9157 	error = tog_load_refs(repo, 0);
9158 	if (error)
9159 		goto done;
9160 
9161 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9162 	if (view == NULL) {
9163 		error = got_error_from_errno("view_open");
9164 		goto done;
9165 	}
9166 
9167 	error = open_ref_view(view, repo);
9168 	if (error)
9169 		goto done;
9170 
9171 	if (worktree) {
9172 		error = set_tog_base_commit(repo, worktree);
9173 		if (error != NULL)
9174 			goto done;
9175 
9176 		/* Release work tree lock. */
9177 		got_worktree_close(worktree);
9178 		worktree = NULL;
9179 	}
9180 
9181 	error = view_loop(view);
9182 
9183 done:
9184 	free(tog_base_commit.id);
9185 	free(repo_path);
9186 	free(cwd);
9187 	if (worktree != NULL)
9188 		got_worktree_close(worktree);
9189 	if (repo) {
9190 		const struct got_error *close_err = got_repo_close(repo);
9191 		if (close_err)
9192 			error = close_err;
9193 	}
9194 	if (pack_fds) {
9195 		const struct got_error *pack_err =
9196 		    got_repo_pack_fds_close(pack_fds);
9197 		if (error == NULL)
9198 			error = pack_err;
9199 	}
9200 	tog_free_refs();
9201 	return error;
9202 }
9203 
9204 static const struct got_error*
9205 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9206     const char *str)
9207 {
9208 	size_t len;
9209 
9210 	if (win == NULL)
9211 		win = stdscr;
9212 
9213 	len = strlen(str);
9214 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9215 
9216 	if (focus)
9217 		wstandout(win);
9218 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9219 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9220 	if (focus)
9221 		wstandend(win);
9222 
9223 	return NULL;
9224 }
9225 
9226 static const struct got_error *
9227 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9228 {
9229 	off_t *p;
9230 
9231 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9232 	if (p == NULL) {
9233 		free(*line_offsets);
9234 		*line_offsets = NULL;
9235 		return got_error_from_errno("reallocarray");
9236 	}
9237 
9238 	*line_offsets = p;
9239 	(*line_offsets)[*nlines] = off;
9240 	++(*nlines);
9241 	return NULL;
9242 }
9243 
9244 static const struct got_error *
9245 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9246 {
9247 	*ret = 0;
9248 
9249 	for (;n > 0; --n, ++km) {
9250 		char	*t0, *t, *k;
9251 		size_t	 len = 1;
9252 
9253 		if (km->keys == NULL)
9254 			continue;
9255 
9256 		t = t0 = strdup(km->keys);
9257 		if (t0 == NULL)
9258 			return got_error_from_errno("strdup");
9259 
9260 		len += strlen(t);
9261 		while ((k = strsep(&t, " ")) != NULL)
9262 			len += strlen(k) > 1 ? 2 : 0;
9263 		free(t0);
9264 		*ret = MAX(*ret, len);
9265 	}
9266 
9267 	return NULL;
9268 }
9269 
9270 /*
9271  * Write keymap section headers, keys, and key info in km to f.
9272  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9273  * wrap control and symbolic keys in guillemets, else use <>.
9274  */
9275 static const struct got_error *
9276 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9277 {
9278 	int n, len = width;
9279 
9280 	if (km->keys) {
9281 		static const char *u8_glyph[] = {
9282 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9283 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9284 		};
9285 		char	*t0, *t, *k;
9286 		int	 cs, s, first = 1;
9287 
9288 		cs = got_locale_is_utf8();
9289 
9290 		t = t0 = strdup(km->keys);
9291 		if (t0 == NULL)
9292 			return got_error_from_errno("strdup");
9293 
9294 		len = strlen(km->keys);
9295 		while ((k = strsep(&t, " ")) != NULL) {
9296 			s = strlen(k) > 1;  /* control or symbolic key */
9297 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9298 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9299 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9300 			if (n < 0) {
9301 				free(t0);
9302 				return got_error_from_errno("fprintf");
9303 			}
9304 			first = 0;
9305 			len += s ? 2 : 0;
9306 			*off += n;
9307 		}
9308 		free(t0);
9309 	}
9310 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9311 	if (n < 0)
9312 		return got_error_from_errno("fprintf");
9313 	*off += n;
9314 
9315 	return NULL;
9316 }
9317 
9318 static const struct got_error *
9319 format_help(struct tog_help_view_state *s)
9320 {
9321 	const struct got_error		*err = NULL;
9322 	off_t				 off = 0;
9323 	int				 i, max, n, show = s->all;
9324 	static const struct tog_key_map	 km[] = {
9325 #define KEYMAP_(info, type)	{ NULL, (info), type }
9326 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9327 		GENERATE_HELP
9328 #undef KEYMAP_
9329 #undef KEY_
9330 	};
9331 
9332 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9333 	if (err)
9334 		return err;
9335 
9336 	n = nitems(km);
9337 	err = max_key_str(&max, km, n);
9338 	if (err)
9339 		return err;
9340 
9341 	for (i = 0; i < n; ++i) {
9342 		if (km[i].keys == NULL) {
9343 			show = s->all;
9344 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9345 			    km[i].type == s->type || s->all)
9346 				show = 1;
9347 		}
9348 		if (show) {
9349 			err = format_help_line(&off, s->f, &km[i], max);
9350 			if (err)
9351 				return err;
9352 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9353 			if (err)
9354 				return err;
9355 		}
9356 	}
9357 	fputc('\n', s->f);
9358 	++off;
9359 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9360 	return err;
9361 }
9362 
9363 static const struct got_error *
9364 create_help(struct tog_help_view_state *s)
9365 {
9366 	FILE			*f;
9367 	const struct got_error	*err;
9368 
9369 	free(s->line_offsets);
9370 	s->line_offsets = NULL;
9371 	s->nlines = 0;
9372 
9373 	f = got_opentemp();
9374 	if (f == NULL)
9375 		return got_error_from_errno("got_opentemp");
9376 	s->f = f;
9377 
9378 	err = format_help(s);
9379 	if (err)
9380 		return err;
9381 
9382 	if (s->f && fflush(s->f) != 0)
9383 		return got_error_from_errno("fflush");
9384 
9385 	return NULL;
9386 }
9387 
9388 static const struct got_error *
9389 search_start_help_view(struct tog_view *view)
9390 {
9391 	view->state.help.matched_line = 0;
9392 	return NULL;
9393 }
9394 
9395 static void
9396 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9397     size_t *nlines, int **first, int **last, int **match, int **selected)
9398 {
9399 	struct tog_help_view_state *s = &view->state.help;
9400 
9401 	*f = s->f;
9402 	*nlines = s->nlines;
9403 	*line_offsets = s->line_offsets;
9404 	*match = &s->matched_line;
9405 	*first = &s->first_displayed_line;
9406 	*last = &s->last_displayed_line;
9407 	*selected = &s->selected_line;
9408 }
9409 
9410 static const struct got_error *
9411 show_help_view(struct tog_view *view)
9412 {
9413 	struct tog_help_view_state	*s = &view->state.help;
9414 	const struct got_error		*err;
9415 	regmatch_t			*regmatch = &view->regmatch;
9416 	wchar_t				*wline;
9417 	char				*line;
9418 	ssize_t				 linelen;
9419 	size_t				 linesz = 0;
9420 	int				 width, nprinted = 0, rc = 0;
9421 	int				 eos = view->nlines;
9422 
9423 	if (view_is_hsplit_top(view))
9424 		--eos;  /* account for border */
9425 
9426 	s->lineno = 0;
9427 	rewind(s->f);
9428 	werase(view->window);
9429 
9430 	if (view->gline > s->nlines - 1)
9431 		view->gline = s->nlines - 1;
9432 
9433 	err = win_draw_center(view->window, 0, 0, view->ncols,
9434 	    view_needs_focus_indication(view),
9435 	    "tog help (press q to return to tog)");
9436 	if (err)
9437 		return err;
9438 	if (eos <= 1)
9439 		return NULL;
9440 	waddstr(view->window, "\n\n");
9441 	eos -= 2;
9442 
9443 	s->eof = 0;
9444 	view->maxx = 0;
9445 	line = NULL;
9446 	while (eos > 0 && nprinted < eos) {
9447 		attr_t attr = 0;
9448 
9449 		linelen = getline(&line, &linesz, s->f);
9450 		if (linelen == -1) {
9451 			if (!feof(s->f)) {
9452 				free(line);
9453 				return got_ferror(s->f, GOT_ERR_IO);
9454 			}
9455 			s->eof = 1;
9456 			break;
9457 		}
9458 		if (++s->lineno < s->first_displayed_line)
9459 			continue;
9460 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9461 			continue;
9462 		if (s->lineno == view->hiline)
9463 			attr = A_STANDOUT;
9464 
9465 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9466 		    view->x ? 1 : 0);
9467 		if (err) {
9468 			free(line);
9469 			return err;
9470 		}
9471 		view->maxx = MAX(view->maxx, width);
9472 		free(wline);
9473 		wline = NULL;
9474 
9475 		if (attr)
9476 			wattron(view->window, attr);
9477 		if (s->first_displayed_line + nprinted == s->matched_line &&
9478 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9479 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9480 			    view->window, view->x, regmatch);
9481 			if (err) {
9482 				free(line);
9483 				return err;
9484 			}
9485 		} else {
9486 			int skip;
9487 
9488 			err = format_line(&wline, &width, &skip, line,
9489 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9490 			if (err) {
9491 				free(line);
9492 				return err;
9493 			}
9494 			waddwstr(view->window, &wline[skip]);
9495 			free(wline);
9496 			wline = NULL;
9497 		}
9498 		if (s->lineno == view->hiline) {
9499 			while (width++ < view->ncols)
9500 				waddch(view->window, ' ');
9501 		} else {
9502 			if (width < view->ncols)
9503 				waddch(view->window, '\n');
9504 		}
9505 		if (attr)
9506 			wattroff(view->window, attr);
9507 		if (++nprinted == 1)
9508 			s->first_displayed_line = s->lineno;
9509 	}
9510 	free(line);
9511 	if (nprinted > 0)
9512 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9513 	else
9514 		s->last_displayed_line = s->first_displayed_line;
9515 
9516 	view_border(view);
9517 
9518 	if (s->eof) {
9519 		rc = waddnstr(view->window,
9520 		    "See the tog(1) manual page for full documentation",
9521 		    view->ncols - 1);
9522 		if (rc == ERR)
9523 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9524 	} else {
9525 		wmove(view->window, view->nlines - 1, 0);
9526 		wclrtoeol(view->window);
9527 		wstandout(view->window);
9528 		rc = waddnstr(view->window, "scroll down for more...",
9529 		    view->ncols - 1);
9530 		if (rc == ERR)
9531 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9532 		if (getcurx(view->window) < view->ncols - 6) {
9533 			rc = wprintw(view->window, "[%.0f%%]",
9534 			    100.00 * s->last_displayed_line / s->nlines);
9535 			if (rc == ERR)
9536 				return got_error_msg(GOT_ERR_IO, "wprintw");
9537 		}
9538 		wstandend(view->window);
9539 	}
9540 
9541 	return NULL;
9542 }
9543 
9544 static const struct got_error *
9545 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9546 {
9547 	struct tog_help_view_state	*s = &view->state.help;
9548 	const struct got_error		*err = NULL;
9549 	char				*line = NULL;
9550 	ssize_t				 linelen;
9551 	size_t				 linesz = 0;
9552 	int				 eos, nscroll;
9553 
9554 	eos = nscroll = view->nlines;
9555 	if (view_is_hsplit_top(view))
9556 		--eos;  /* border */
9557 
9558 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9559 
9560 	switch (ch) {
9561 	case '0':
9562 	case '$':
9563 	case KEY_RIGHT:
9564 	case 'l':
9565 	case KEY_LEFT:
9566 	case 'h':
9567 		horizontal_scroll_input(view, ch);
9568 		break;
9569 	case 'g':
9570 	case KEY_HOME:
9571 		s->first_displayed_line = 1;
9572 		view->count = 0;
9573 		break;
9574 	case 'G':
9575 	case KEY_END:
9576 		view->count = 0;
9577 		if (s->eof)
9578 			break;
9579 		s->first_displayed_line = (s->nlines - eos) + 3;
9580 		s->eof = 1;
9581 		break;
9582 	case 'k':
9583 	case KEY_UP:
9584 		if (s->first_displayed_line > 1)
9585 			--s->first_displayed_line;
9586 		else
9587 			view->count = 0;
9588 		break;
9589 	case CTRL('u'):
9590 	case 'u':
9591 		nscroll /= 2;
9592 		/* FALL THROUGH */
9593 	case KEY_PPAGE:
9594 	case CTRL('b'):
9595 	case 'b':
9596 		if (s->first_displayed_line == 1) {
9597 			view->count = 0;
9598 			break;
9599 		}
9600 		while (--nscroll > 0 && s->first_displayed_line > 1)
9601 			s->first_displayed_line--;
9602 		break;
9603 	case 'j':
9604 	case KEY_DOWN:
9605 	case CTRL('n'):
9606 		if (!s->eof)
9607 			++s->first_displayed_line;
9608 		else
9609 			view->count = 0;
9610 		break;
9611 	case CTRL('d'):
9612 	case 'd':
9613 		nscroll /= 2;
9614 		/* FALL THROUGH */
9615 	case KEY_NPAGE:
9616 	case CTRL('f'):
9617 	case 'f':
9618 	case ' ':
9619 		if (s->eof) {
9620 			view->count = 0;
9621 			break;
9622 		}
9623 		while (!s->eof && --nscroll > 0) {
9624 			linelen = getline(&line, &linesz, s->f);
9625 			s->first_displayed_line++;
9626 			if (linelen == -1) {
9627 				if (feof(s->f))
9628 					s->eof = 1;
9629 				else
9630 					err = got_ferror(s->f, GOT_ERR_IO);
9631 				break;
9632 			}
9633 		}
9634 		free(line);
9635 		break;
9636 	default:
9637 		view->count = 0;
9638 		break;
9639 	}
9640 
9641 	return err;
9642 }
9643 
9644 static const struct got_error *
9645 close_help_view(struct tog_view *view)
9646 {
9647 	struct tog_help_view_state *s = &view->state.help;
9648 
9649 	free(s->line_offsets);
9650 	s->line_offsets = NULL;
9651 	if (fclose(s->f) == EOF)
9652 		return got_error_from_errno("fclose");
9653 
9654 	return NULL;
9655 }
9656 
9657 static const struct got_error *
9658 reset_help_view(struct tog_view *view)
9659 {
9660 	struct tog_help_view_state *s = &view->state.help;
9661 
9662 
9663 	if (s->f && fclose(s->f) == EOF)
9664 		return got_error_from_errno("fclose");
9665 
9666 	wclear(view->window);
9667 	view->count = 0;
9668 	view->x = 0;
9669 	s->all = !s->all;
9670 	s->first_displayed_line = 1;
9671 	s->last_displayed_line = view->nlines;
9672 	s->matched_line = 0;
9673 
9674 	return create_help(s);
9675 }
9676 
9677 static const struct got_error *
9678 open_help_view(struct tog_view *view, struct tog_view *parent)
9679 {
9680 	const struct got_error		*err = NULL;
9681 	struct tog_help_view_state	*s = &view->state.help;
9682 
9683 	s->type = (enum tog_keymap_type)parent->type;
9684 	s->first_displayed_line = 1;
9685 	s->last_displayed_line = view->nlines;
9686 	s->selected_line = 1;
9687 
9688 	view->show = show_help_view;
9689 	view->input = input_help_view;
9690 	view->reset = reset_help_view;
9691 	view->close = close_help_view;
9692 	view->search_start = search_start_help_view;
9693 	view->search_setup = search_setup_help_view;
9694 	view->search_next = search_next_view_match;
9695 
9696 	err = create_help(s);
9697 	return err;
9698 }
9699 
9700 static const struct got_error *
9701 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9702     enum tog_view_type request, int y, int x)
9703 {
9704 	const struct got_error *err = NULL;
9705 
9706 	*new_view = NULL;
9707 
9708 	switch (request) {
9709 	case TOG_VIEW_DIFF:
9710 		if (view->type == TOG_VIEW_LOG) {
9711 			struct tog_log_view_state *s = &view->state.log;
9712 
9713 			err = open_diff_view_for_commit(new_view, y, x,
9714 			    s->selected_entry->commit, s->selected_entry->id,
9715 			    view, s->repo);
9716 		} else
9717 			return got_error_msg(GOT_ERR_NOT_IMPL,
9718 			    "parent/child view pair not supported");
9719 		break;
9720 	case TOG_VIEW_BLAME:
9721 		if (view->type == TOG_VIEW_TREE) {
9722 			struct tog_tree_view_state *s = &view->state.tree;
9723 
9724 			err = blame_tree_entry(new_view, y, x,
9725 			    s->selected_entry, &s->parents, s->commit_id,
9726 			    s->repo);
9727 		} else
9728 			return got_error_msg(GOT_ERR_NOT_IMPL,
9729 			    "parent/child view pair not supported");
9730 		break;
9731 	case TOG_VIEW_LOG:
9732 		if (view->type == TOG_VIEW_BLAME)
9733 			err = log_annotated_line(new_view, y, x,
9734 			    view->state.blame.repo, view->state.blame.id_to_log);
9735 		else if (view->type == TOG_VIEW_TREE)
9736 			err = log_selected_tree_entry(new_view, y, x,
9737 			    &view->state.tree);
9738 		else if (view->type == TOG_VIEW_REF)
9739 			err = log_ref_entry(new_view, y, x,
9740 			    view->state.ref.selected_entry,
9741 			    view->state.ref.repo);
9742 		else
9743 			return got_error_msg(GOT_ERR_NOT_IMPL,
9744 			    "parent/child view pair not supported");
9745 		break;
9746 	case TOG_VIEW_TREE:
9747 		if (view->type == TOG_VIEW_LOG)
9748 			err = browse_commit_tree(new_view, y, x,
9749 			    view->state.log.selected_entry,
9750 			    view->state.log.in_repo_path,
9751 			    view->state.log.head_ref_name,
9752 			    view->state.log.repo);
9753 		else if (view->type == TOG_VIEW_REF)
9754 			err = browse_ref_tree(new_view, y, x,
9755 			    view->state.ref.selected_entry,
9756 			    view->state.ref.repo);
9757 		else
9758 			return got_error_msg(GOT_ERR_NOT_IMPL,
9759 			    "parent/child view pair not supported");
9760 		break;
9761 	case TOG_VIEW_REF:
9762 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9763 		if (*new_view == NULL)
9764 			return got_error_from_errno("view_open");
9765 		if (view->type == TOG_VIEW_LOG)
9766 			err = open_ref_view(*new_view, view->state.log.repo);
9767 		else if (view->type == TOG_VIEW_TREE)
9768 			err = open_ref_view(*new_view, view->state.tree.repo);
9769 		else
9770 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9771 			    "parent/child view pair not supported");
9772 		if (err)
9773 			view_close(*new_view);
9774 		break;
9775 	case TOG_VIEW_HELP:
9776 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9777 		if (*new_view == NULL)
9778 			return got_error_from_errno("view_open");
9779 		err = open_help_view(*new_view, view);
9780 		if (err)
9781 			view_close(*new_view);
9782 		break;
9783 	default:
9784 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9785 	}
9786 
9787 	return err;
9788 }
9789 
9790 /*
9791  * If view was scrolled down to move the selected line into view when opening a
9792  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9793  */
9794 static void
9795 offset_selection_up(struct tog_view *view)
9796 {
9797 	switch (view->type) {
9798 	case TOG_VIEW_BLAME: {
9799 		struct tog_blame_view_state *s = &view->state.blame;
9800 		if (s->first_displayed_line == 1) {
9801 			s->selected_line = MAX(s->selected_line - view->offset,
9802 			    1);
9803 			break;
9804 		}
9805 		if (s->first_displayed_line > view->offset)
9806 			s->first_displayed_line -= view->offset;
9807 		else
9808 			s->first_displayed_line = 1;
9809 		s->selected_line += view->offset;
9810 		break;
9811 	}
9812 	case TOG_VIEW_LOG:
9813 		log_scroll_up(&view->state.log, view->offset);
9814 		view->state.log.selected += view->offset;
9815 		break;
9816 	case TOG_VIEW_REF:
9817 		ref_scroll_up(&view->state.ref, view->offset);
9818 		view->state.ref.selected += view->offset;
9819 		break;
9820 	case TOG_VIEW_TREE:
9821 		tree_scroll_up(&view->state.tree, view->offset);
9822 		view->state.tree.selected += view->offset;
9823 		break;
9824 	default:
9825 		break;
9826 	}
9827 
9828 	view->offset = 0;
9829 }
9830 
9831 /*
9832  * If the selected line is in the section of screen covered by the bottom split,
9833  * scroll down offset lines to move it into view and index its new position.
9834  */
9835 static const struct got_error *
9836 offset_selection_down(struct tog_view *view)
9837 {
9838 	const struct got_error	*err = NULL;
9839 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9840 	int			*selected = NULL;
9841 	int			 header, offset;
9842 
9843 	switch (view->type) {
9844 	case TOG_VIEW_BLAME: {
9845 		struct tog_blame_view_state *s = &view->state.blame;
9846 		header = 3;
9847 		scrolld = NULL;
9848 		if (s->selected_line > view->nlines - header) {
9849 			offset = abs(view->nlines - s->selected_line - header);
9850 			s->first_displayed_line += offset;
9851 			s->selected_line -= offset;
9852 			view->offset = offset;
9853 		}
9854 		break;
9855 	}
9856 	case TOG_VIEW_LOG: {
9857 		struct tog_log_view_state *s = &view->state.log;
9858 		scrolld = &log_scroll_down;
9859 		header = view_is_parent_view(view) ? 3 : 2;
9860 		selected = &s->selected;
9861 		break;
9862 	}
9863 	case TOG_VIEW_REF: {
9864 		struct tog_ref_view_state *s = &view->state.ref;
9865 		scrolld = &ref_scroll_down;
9866 		header = 3;
9867 		selected = &s->selected;
9868 		break;
9869 	}
9870 	case TOG_VIEW_TREE: {
9871 		struct tog_tree_view_state *s = &view->state.tree;
9872 		scrolld = &tree_scroll_down;
9873 		header = 5;
9874 		selected = &s->selected;
9875 		break;
9876 	}
9877 	default:
9878 		selected = NULL;
9879 		scrolld = NULL;
9880 		header = 0;
9881 		break;
9882 	}
9883 
9884 	if (selected && *selected > view->nlines - header) {
9885 		offset = abs(view->nlines - *selected - header);
9886 		view->offset = offset;
9887 		if (scrolld && offset) {
9888 			err = scrolld(view, offset);
9889 			*selected -= offset;
9890 		}
9891 	}
9892 
9893 	return err;
9894 }
9895 
9896 static void
9897 list_commands(FILE *fp)
9898 {
9899 	size_t i;
9900 
9901 	fprintf(fp, "commands:");
9902 	for (i = 0; i < nitems(tog_commands); i++) {
9903 		const struct tog_cmd *cmd = &tog_commands[i];
9904 		fprintf(fp, " %s", cmd->name);
9905 	}
9906 	fputc('\n', fp);
9907 }
9908 
9909 __dead static void
9910 usage(int hflag, int status)
9911 {
9912 	FILE *fp = (status == 0) ? stdout : stderr;
9913 
9914 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9915 	    getprogname());
9916 	if (hflag) {
9917 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9918 		list_commands(fp);
9919 	}
9920 	exit(status);
9921 }
9922 
9923 static char **
9924 make_argv(int argc, ...)
9925 {
9926 	va_list ap;
9927 	char **argv;
9928 	int i;
9929 
9930 	va_start(ap, argc);
9931 
9932 	argv = calloc(argc, sizeof(char *));
9933 	if (argv == NULL)
9934 		err(1, "calloc");
9935 	for (i = 0; i < argc; i++) {
9936 		argv[i] = strdup(va_arg(ap, char *));
9937 		if (argv[i] == NULL)
9938 			err(1, "strdup");
9939 	}
9940 
9941 	va_end(ap);
9942 	return argv;
9943 }
9944 
9945 /*
9946  * Try to convert 'tog path' into a 'tog log path' command.
9947  * The user could simply have mistyped the command rather than knowingly
9948  * provided a path. So check whether argv[0] can in fact be resolved
9949  * to a path in the HEAD commit and print a special error if not.
9950  * This hack is for mpi@ <3
9951  */
9952 static const struct got_error *
9953 tog_log_with_path(int argc, char *argv[])
9954 {
9955 	const struct got_error *error = NULL, *close_err;
9956 	const struct tog_cmd *cmd = NULL;
9957 	struct got_repository *repo = NULL;
9958 	struct got_worktree *worktree = NULL;
9959 	struct got_object_id *commit_id = NULL, *id = NULL;
9960 	struct got_commit_object *commit = NULL;
9961 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9962 	char *commit_id_str = NULL, **cmd_argv = NULL;
9963 	int *pack_fds = NULL;
9964 
9965 	cwd = getcwd(NULL, 0);
9966 	if (cwd == NULL)
9967 		return got_error_from_errno("getcwd");
9968 
9969 	error = got_repo_pack_fds_open(&pack_fds);
9970 	if (error != NULL)
9971 		goto done;
9972 
9973 	error = got_worktree_open(&worktree, cwd, NULL);
9974 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9975 		goto done;
9976 
9977 	if (worktree)
9978 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9979 	else
9980 		repo_path = strdup(cwd);
9981 	if (repo_path == NULL) {
9982 		error = got_error_from_errno("strdup");
9983 		goto done;
9984 	}
9985 
9986 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9987 	if (error != NULL)
9988 		goto done;
9989 
9990 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9991 	    repo, worktree);
9992 	if (error)
9993 		goto done;
9994 
9995 	error = tog_load_refs(repo, 0);
9996 	if (error)
9997 		goto done;
9998 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9999 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
10000 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
10001 	if (error)
10002 		goto done;
10003 
10004 	if (worktree) {
10005 		got_worktree_close(worktree);
10006 		worktree = NULL;
10007 	}
10008 
10009 	error = got_object_open_as_commit(&commit, repo, commit_id);
10010 	if (error)
10011 		goto done;
10012 
10013 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
10014 	if (error) {
10015 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
10016 			goto done;
10017 		fprintf(stderr, "%s: '%s' is no known command or path\n",
10018 		    getprogname(), argv[0]);
10019 		usage(1, 1);
10020 		/* not reached */
10021 	}
10022 
10023 	error = got_object_id_str(&commit_id_str, commit_id);
10024 	if (error)
10025 		goto done;
10026 
10027 	cmd = &tog_commands[0]; /* log */
10028 	argc = 4;
10029 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
10030 	error = cmd->cmd_main(argc, cmd_argv);
10031 done:
10032 	if (repo) {
10033 		close_err = got_repo_close(repo);
10034 		if (error == NULL)
10035 			error = close_err;
10036 	}
10037 	if (commit)
10038 		got_object_commit_close(commit);
10039 	if (worktree)
10040 		got_worktree_close(worktree);
10041 	if (pack_fds) {
10042 		const struct got_error *pack_err =
10043 		    got_repo_pack_fds_close(pack_fds);
10044 		if (error == NULL)
10045 			error = pack_err;
10046 	}
10047 	free(id);
10048 	free(commit_id_str);
10049 	free(commit_id);
10050 	free(cwd);
10051 	free(repo_path);
10052 	free(in_repo_path);
10053 	if (cmd_argv) {
10054 		int i;
10055 		for (i = 0; i < argc; i++)
10056 			free(cmd_argv[i]);
10057 		free(cmd_argv);
10058 	}
10059 	tog_free_refs();
10060 	return error;
10061 }
10062 
10063 int
10064 main(int argc, char *argv[])
10065 {
10066 	const struct got_error *io_err, *error = NULL;
10067 	const struct tog_cmd *cmd = NULL;
10068 	int ch, hflag = 0, Vflag = 0;
10069 	char **cmd_argv = NULL;
10070 	static const struct option longopts[] = {
10071 	    { "version", no_argument, NULL, 'V' },
10072 	    { NULL, 0, NULL, 0}
10073 	};
10074 	char *diff_algo_str = NULL;
10075 	const char *test_script_path;
10076 
10077 	setlocale(LC_CTYPE, "");
10078 
10079 	/*
10080 	 * Override default signal handlers before starting ncurses.
10081 	 * This should prevent ncurses from installing its own
10082 	 * broken cleanup() signal handler.
10083 	 */
10084 	signal(SIGWINCH, tog_sigwinch);
10085 	signal(SIGPIPE, tog_sigpipe);
10086 	signal(SIGCONT, tog_sigcont);
10087 	signal(SIGINT, tog_sigint);
10088 	signal(SIGTERM, tog_sigterm);
10089 
10090 	/*
10091 	 * Test mode init must happen before pledge() because "tty" will
10092 	 * not allow TTY-related ioctls to occur via regular files.
10093 	 */
10094 	test_script_path = getenv("TOG_TEST_SCRIPT");
10095 	if (test_script_path != NULL) {
10096 		error = init_mock_term(test_script_path);
10097 		if (error) {
10098 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10099 			return 1;
10100 		}
10101 	} else if (!isatty(STDIN_FILENO))
10102 		errx(1, "standard input is not a tty");
10103 
10104 #if !defined(PROFILE)
10105 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10106 	    NULL) == -1)
10107 		err(1, "pledge");
10108 #endif
10109 
10110 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10111 		switch (ch) {
10112 		case 'h':
10113 			hflag = 1;
10114 			break;
10115 		case 'V':
10116 			Vflag = 1;
10117 			break;
10118 		default:
10119 			usage(hflag, 1);
10120 			/* NOTREACHED */
10121 		}
10122 	}
10123 
10124 	argc -= optind;
10125 	argv += optind;
10126 	optind = 1;
10127 	optreset = 1;
10128 
10129 	if (Vflag) {
10130 		got_version_print_str();
10131 		return 0;
10132 	}
10133 
10134 	if (argc == 0) {
10135 		if (hflag)
10136 			usage(hflag, 0);
10137 		/* Build an argument vector which runs a default command. */
10138 		cmd = &tog_commands[0];
10139 		argc = 1;
10140 		cmd_argv = make_argv(argc, cmd->name);
10141 	} else {
10142 		size_t i;
10143 
10144 		/* Did the user specify a command? */
10145 		for (i = 0; i < nitems(tog_commands); i++) {
10146 			if (strncmp(tog_commands[i].name, argv[0],
10147 			    strlen(argv[0])) == 0) {
10148 				cmd = &tog_commands[i];
10149 				break;
10150 			}
10151 		}
10152 	}
10153 
10154 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10155 	if (diff_algo_str) {
10156 		if (strcasecmp(diff_algo_str, "patience") == 0)
10157 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10158 		if (strcasecmp(diff_algo_str, "myers") == 0)
10159 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10160 	}
10161 
10162 	tog_base_commit.idx = -1;
10163 	tog_base_commit.marker = GOT_WORKTREE_STATE_UNKNOWN;
10164 
10165 	if (cmd == NULL) {
10166 		if (argc != 1)
10167 			usage(0, 1);
10168 		/* No command specified; try log with a path */
10169 		error = tog_log_with_path(argc, argv);
10170 	} else {
10171 		if (hflag)
10172 			cmd->cmd_usage();
10173 		else
10174 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10175 	}
10176 
10177 	if (using_mock_io) {
10178 		io_err = tog_io_close();
10179 		if (error == NULL)
10180 			error = io_err;
10181 	}
10182 	endwin();
10183 	if (cmd_argv) {
10184 		int i;
10185 		for (i = 0; i < argc; i++)
10186 			free(cmd_argv[i]);
10187 		free(cmd_argv);
10188 	}
10189 
10190 	if (error && error->code != GOT_ERR_CANCELLED &&
10191 	    error->code != GOT_ERR_EOF &&
10192 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10193 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10194 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10195 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10196 		return 1;
10197 	}
10198 	return 0;
10199 }