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