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