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 <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 	TOG_VIEW_HELP
107 };
108 
109 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
110 enum tog_keymap_type {
111 	TOG_KEYMAP_KEYS = -2,
112 	TOG_KEYMAP_GLOBAL,
113 	TOG_KEYMAP_DIFF,
114 	TOG_KEYMAP_LOG,
115 	TOG_KEYMAP_BLAME,
116 	TOG_KEYMAP_TREE,
117 	TOG_KEYMAP_REF,
118 	TOG_KEYMAP_HELP
119 };
120 
121 enum tog_view_mode {
122 	TOG_VIEW_SPLIT_NONE,
123 	TOG_VIEW_SPLIT_VERT,
124 	TOG_VIEW_SPLIT_HRZN
125 };
126 
127 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
128 
129 #define TOG_EOF_STRING	"(END)"
130 
131 struct commit_queue_entry {
132 	TAILQ_ENTRY(commit_queue_entry) entry;
133 	struct got_object_id *id;
134 	struct got_commit_object *commit;
135 	int idx;
136 };
137 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
138 struct commit_queue {
139 	int ncommits;
140 	struct commit_queue_head head;
141 };
142 
143 struct tog_color {
144 	STAILQ_ENTRY(tog_color) entry;
145 	regex_t regex;
146 	short colorpair;
147 };
148 STAILQ_HEAD(tog_colors, tog_color);
149 
150 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
151 static struct got_reflist_object_id_map *tog_refs_idmap;
152 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
153 
154 static const struct got_error *
155 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
156     struct got_reference* re2)
157 {
158 	const char *name1 = got_ref_get_name(re1);
159 	const char *name2 = got_ref_get_name(re2);
160 	int isbackup1, isbackup2;
161 
162 	/* Sort backup refs towards the bottom of the list. */
163 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
164 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
165 	if (!isbackup1 && isbackup2) {
166 		*cmp = -1;
167 		return NULL;
168 	} else if (isbackup1 && !isbackup2) {
169 		*cmp = 1;
170 		return NULL;
171 	}
172 
173 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
174 	return NULL;
175 }
176 
177 static const struct got_error *
178 tog_load_refs(struct got_repository *repo, int sort_by_date)
179 {
180 	const struct got_error *err;
181 
182 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
183 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
184 	    repo);
185 	if (err)
186 		return err;
187 
188 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
189 	    repo);
190 }
191 
192 static void
193 tog_free_refs(void)
194 {
195 	if (tog_refs_idmap) {
196 		got_reflist_object_id_map_free(tog_refs_idmap);
197 		tog_refs_idmap = NULL;
198 	}
199 	got_ref_list_free(&tog_refs);
200 }
201 
202 static const struct got_error *
203 add_color(struct tog_colors *colors, const char *pattern,
204     int idx, short color)
205 {
206 	const struct got_error *err = NULL;
207 	struct tog_color *tc;
208 	int regerr = 0;
209 
210 	if (idx < 1 || idx > COLOR_PAIRS - 1)
211 		return NULL;
212 
213 	init_pair(idx, color, -1);
214 
215 	tc = calloc(1, sizeof(*tc));
216 	if (tc == NULL)
217 		return got_error_from_errno("calloc");
218 	regerr = regcomp(&tc->regex, pattern,
219 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
220 	if (regerr) {
221 		static char regerr_msg[512];
222 		static char err_msg[512];
223 		regerror(regerr, &tc->regex, regerr_msg,
224 		    sizeof(regerr_msg));
225 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
226 		    regerr_msg);
227 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
228 		free(tc);
229 		return err;
230 	}
231 	tc->colorpair = idx;
232 	STAILQ_INSERT_HEAD(colors, tc, entry);
233 	return NULL;
234 }
235 
236 static void
237 free_colors(struct tog_colors *colors)
238 {
239 	struct tog_color *tc;
240 
241 	while (!STAILQ_EMPTY(colors)) {
242 		tc = STAILQ_FIRST(colors);
243 		STAILQ_REMOVE_HEAD(colors, entry);
244 		regfree(&tc->regex);
245 		free(tc);
246 	}
247 }
248 
249 static struct tog_color *
250 get_color(struct tog_colors *colors, int colorpair)
251 {
252 	struct tog_color *tc = NULL;
253 
254 	STAILQ_FOREACH(tc, colors, entry) {
255 		if (tc->colorpair == colorpair)
256 			return tc;
257 	}
258 
259 	return NULL;
260 }
261 
262 static int
263 default_color_value(const char *envvar)
264 {
265 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
268 		return COLOR_CYAN;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
274 		return COLOR_MAGENTA;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
278 		return COLOR_CYAN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
286 		return COLOR_YELLOW;
287 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
290 		return COLOR_MAGENTA;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
294 		return COLOR_CYAN;
295 
296 	return -1;
297 }
298 
299 static int
300 get_color_value(const char *envvar)
301 {
302 	const char *val = getenv(envvar);
303 
304 	if (val == NULL)
305 		return default_color_value(envvar);
306 
307 	if (strcasecmp(val, "black") == 0)
308 		return COLOR_BLACK;
309 	if (strcasecmp(val, "red") == 0)
310 		return COLOR_RED;
311 	if (strcasecmp(val, "green") == 0)
312 		return COLOR_GREEN;
313 	if (strcasecmp(val, "yellow") == 0)
314 		return COLOR_YELLOW;
315 	if (strcasecmp(val, "blue") == 0)
316 		return COLOR_BLUE;
317 	if (strcasecmp(val, "magenta") == 0)
318 		return COLOR_MAGENTA;
319 	if (strcasecmp(val, "cyan") == 0)
320 		return COLOR_CYAN;
321 	if (strcasecmp(val, "white") == 0)
322 		return COLOR_WHITE;
323 	if (strcasecmp(val, "default") == 0)
324 		return -1;
325 
326 	return default_color_value(envvar);
327 }
328 
329 struct tog_diff_view_state {
330 	struct got_object_id *id1, *id2;
331 	const char *label1, *label2;
332 	FILE *f, *f1, *f2;
333 	int fd1, fd2;
334 	int lineno;
335 	int first_displayed_line;
336 	int last_displayed_line;
337 	int eof;
338 	int diff_context;
339 	int ignore_whitespace;
340 	int force_text_diff;
341 	struct got_repository *repo;
342 	struct got_diff_line *lines;
343 	size_t nlines;
344 	int matched_line;
345 	int selected_line;
346 
347 	/* passed from log or blame view; may be NULL */
348 	struct tog_view *parent_view;
349 };
350 
351 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
352 static volatile sig_atomic_t tog_thread_error;
353 
354 struct tog_log_thread_args {
355 	pthread_cond_t need_commits;
356 	pthread_cond_t commit_loaded;
357 	int commits_needed;
358 	int load_all;
359 	struct got_commit_graph *graph;
360 	struct commit_queue *real_commits;
361 	const char *in_repo_path;
362 	struct got_object_id *start_id;
363 	struct got_repository *repo;
364 	int *pack_fds;
365 	int log_complete;
366 	sig_atomic_t *quit;
367 	struct commit_queue_entry **first_displayed_entry;
368 	struct commit_queue_entry **selected_entry;
369 	int *searching;
370 	int *search_next_done;
371 	regex_t *regex;
372 	int *limiting;
373 	int limit_match;
374 	regex_t *limit_regex;
375 	struct commit_queue *limit_commits;
376 };
377 
378 struct tog_log_view_state {
379 	struct commit_queue *commits;
380 	struct commit_queue_entry *first_displayed_entry;
381 	struct commit_queue_entry *last_displayed_entry;
382 	struct commit_queue_entry *selected_entry;
383 	struct commit_queue real_commits;
384 	int selected;
385 	char *in_repo_path;
386 	char *head_ref_name;
387 	int log_branches;
388 	struct got_repository *repo;
389 	struct got_object_id *start_id;
390 	sig_atomic_t quit;
391 	pthread_t thread;
392 	struct tog_log_thread_args thread_args;
393 	struct commit_queue_entry *matched_entry;
394 	struct commit_queue_entry *search_entry;
395 	struct tog_colors colors;
396 	int use_committer;
397 	int limit_view;
398 	regex_t limit_regex;
399 	struct commit_queue limit_commits;
400 };
401 
402 #define TOG_COLOR_DIFF_MINUS		1
403 #define TOG_COLOR_DIFF_PLUS		2
404 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
405 #define TOG_COLOR_DIFF_META		4
406 #define TOG_COLOR_TREE_SUBMODULE	5
407 #define TOG_COLOR_TREE_SYMLINK		6
408 #define TOG_COLOR_TREE_DIRECTORY	7
409 #define TOG_COLOR_TREE_EXECUTABLE	8
410 #define TOG_COLOR_COMMIT		9
411 #define TOG_COLOR_AUTHOR		10
412 #define TOG_COLOR_DATE			11
413 #define TOG_COLOR_REFS_HEADS		12
414 #define TOG_COLOR_REFS_TAGS		13
415 #define TOG_COLOR_REFS_REMOTES		14
416 #define TOG_COLOR_REFS_BACKUP		15
417 
418 struct tog_blame_cb_args {
419 	struct tog_blame_line *lines; /* one per line */
420 	int nlines;
421 
422 	struct tog_view *view;
423 	struct got_object_id *commit_id;
424 	int *quit;
425 };
426 
427 struct tog_blame_thread_args {
428 	const char *path;
429 	struct got_repository *repo;
430 	struct tog_blame_cb_args *cb_args;
431 	int *complete;
432 	got_cancel_cb cancel_cb;
433 	void *cancel_arg;
434 };
435 
436 struct tog_blame {
437 	FILE *f;
438 	off_t filesize;
439 	struct tog_blame_line *lines;
440 	int nlines;
441 	off_t *line_offsets;
442 	pthread_t thread;
443 	struct tog_blame_thread_args thread_args;
444 	struct tog_blame_cb_args cb_args;
445 	const char *path;
446 	int *pack_fds;
447 };
448 
449 struct tog_blame_view_state {
450 	int first_displayed_line;
451 	int last_displayed_line;
452 	int selected_line;
453 	int last_diffed_line;
454 	int blame_complete;
455 	int eof;
456 	int done;
457 	struct got_object_id_queue blamed_commits;
458 	struct got_object_qid *blamed_commit;
459 	char *path;
460 	struct got_repository *repo;
461 	struct got_object_id *commit_id;
462 	struct got_object_id *id_to_log;
463 	struct tog_blame blame;
464 	int matched_line;
465 	struct tog_colors colors;
466 };
467 
468 struct tog_parent_tree {
469 	TAILQ_ENTRY(tog_parent_tree) entry;
470 	struct got_tree_object *tree;
471 	struct got_tree_entry *first_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int selected;
474 };
475 
476 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
477 
478 struct tog_tree_view_state {
479 	char *tree_label;
480 	struct got_object_id *commit_id;/* commit which this tree belongs to */
481 	struct got_tree_object *root;	/* the commit's root tree entry */
482 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
483 	struct got_tree_entry *first_displayed_entry;
484 	struct got_tree_entry *last_displayed_entry;
485 	struct got_tree_entry *selected_entry;
486 	int ndisplayed, selected, show_ids;
487 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
488 	char *head_ref_name;
489 	struct got_repository *repo;
490 	struct got_tree_entry *matched_entry;
491 	struct tog_colors colors;
492 };
493 
494 struct tog_reflist_entry {
495 	TAILQ_ENTRY(tog_reflist_entry) entry;
496 	struct got_reference *ref;
497 	int idx;
498 };
499 
500 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
501 
502 struct tog_ref_view_state {
503 	struct tog_reflist_head refs;
504 	struct tog_reflist_entry *first_displayed_entry;
505 	struct tog_reflist_entry *last_displayed_entry;
506 	struct tog_reflist_entry *selected_entry;
507 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
508 	struct got_repository *repo;
509 	struct tog_reflist_entry *matched_entry;
510 	struct tog_colors colors;
511 };
512 
513 struct tog_help_view_state {
514 	FILE			*f;
515 	off_t			*line_offsets;
516 	size_t			 nlines;
517 	int			 lineno;
518 	int			 first_displayed_line;
519 	int			 last_displayed_line;
520 	int			 eof;
521 	int			 matched_line;
522 	int			 selected_line;
523 	int			 all;
524 	enum tog_keymap_type	 type;
525 };
526 
527 #define GENERATE_HELP \
528 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
529 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
530 	KEY_("k C-p Up", "Move cursor or page up one line"), \
531 	KEY_("j C-n Down", "Move cursor or page down one line"), \
532 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
533 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
534 	KEY_("C-u u", "Scroll the view up one half page"), \
535 	KEY_("C-d d", "Scroll the view down one half page"), \
536 	KEY_("g Home", "Go to line N (default: first line)"), \
537 	KEY_("G End", "Go to line N (default: last line)"), \
538 	KEY_("l Right", "Scroll the view right"), \
539 	KEY_("h Left", "Scroll the view left"), \
540 	KEY_("$", "Scroll view to the rightmost position"), \
541 	KEY_("0", "Scroll view to the leftmost position"), \
542 	KEY_("-", "Decrease size of the focussed split"), \
543 	KEY_("+", "Increase size of the focussed split"), \
544 	KEY_("Tab", "Switch focus between views"), \
545 	KEY_("F", "Toggle fullscreen mode"), \
546 	KEY_("/", "Open prompt to enter search term"), \
547 	KEY_("n", "Find next line/token matching the current search term"), \
548 	KEY_("N", "Find previous line/token matching the current search term"),\
549 	KEY_("q", "Quit the focussed view; Quit help screen"), \
550 	KEY_("Q", "Quit tog"), \
551 	\
552 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
553 	KEY_("< ,", "Move cursor up one commit"), \
554 	KEY_("> .", "Move cursor down one commit"), \
555 	KEY_("Enter", "Open diff view of the selected commit"), \
556 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
557 	KEY_("R", "Open ref view of all repository references"), \
558 	KEY_("T", "Display tree view of the repository from the selected" \
559 	    " commit"), \
560 	KEY_("@", "Toggle between displaying author and committer name"), \
561 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
562 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
563 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
564 	\
565 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
566 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
567 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
568 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
569 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
570 	    " data"), \
571 	KEY_("(", "Go to the previous file in the diff"), \
572 	KEY_(")", "Go to the next file in the diff"), \
573 	KEY_("{", "Go to the previous hunk in the diff"), \
574 	KEY_("}", "Go to the next hunk in the diff"), \
575 	KEY_("[", "Decrease the number of context lines"), \
576 	KEY_("]", "Increase the number of context lines"), \
577 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
578 	\
579 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
580 	KEY_("Enter", "Display diff view of the selected line's commit"), \
581 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
582 	KEY_("L", "Open log view for the currently selected annotated line"), \
583 	KEY_("C", "Reload view with the previously blamed commit"), \
584 	KEY_("c", "Reload view with the version of the file found in the" \
585 	    " selected line's commit"), \
586 	KEY_("p", "Reload view with the version of the file found in the" \
587 	    " selected line's parent commit"), \
588 	\
589 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
590 	KEY_("Enter", "Enter selected directory or open blame view of the" \
591 	    " selected file"), \
592 	KEY_("L", "Open log view for the selected entry"), \
593 	KEY_("R", "Open ref view of all repository references"), \
594 	KEY_("i", "Show object IDs for all tree entries"), \
595 	KEY_("Backspace", "Return to the parent directory"), \
596 	\
597 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
598 	KEY_("Enter", "Display log view of the selected reference"), \
599 	KEY_("T", "Display tree view of the selected reference"), \
600 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
601 	KEY_("m", "Toggle display of last modified date for each reference"), \
602 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
603 	KEY_("C-l", "Reload view with all repository references")
604 
605 struct tog_key_map {
606 	const char		*keys;
607 	const char		*info;
608 	enum tog_keymap_type	 type;
609 };
610 
611 /*
612  * We implement two types of views: parent views and child views.
613  *
614  * The 'Tab' key switches focus between a parent view and its child view.
615  * Child views are shown side-by-side to their parent view, provided
616  * there is enough screen estate.
617  *
618  * When a new view is opened from within a parent view, this new view
619  * becomes a child view of the parent view, replacing any existing child.
620  *
621  * When a new view is opened from within a child view, this new view
622  * becomes a parent view which will obscure the views below until the
623  * user quits the new parent view by typing 'q'.
624  *
625  * This list of views contains parent views only.
626  * Child views are only pointed to by their parent view.
627  */
628 TAILQ_HEAD(tog_view_list_head, tog_view);
629 
630 struct tog_view {
631 	TAILQ_ENTRY(tog_view) entry;
632 	WINDOW *window;
633 	PANEL *panel;
634 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
635 	int resized_y, resized_x; /* begin_y/x based on user resizing */
636 	int maxx, x; /* max column and current start column */
637 	int lines, cols; /* copies of LINES and COLS */
638 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
639 	int gline, hiline; /* navigate to and highlight this nG line */
640 	int ch, count; /* current keymap and count prefix */
641 	int resized; /* set when in a resize event */
642 	int focussed; /* Only set on one parent or child view at a time. */
643 	int dying;
644 	struct tog_view *parent;
645 	struct tog_view *child;
646 
647 	/*
648 	 * This flag is initially set on parent views when a new child view
649 	 * is created. It gets toggled when the 'Tab' key switches focus
650 	 * between parent and child.
651 	 * The flag indicates whether focus should be passed on to our child
652 	 * view if this parent view gets picked for focus after another parent
653 	 * view was closed. This prevents child views from losing focus in such
654 	 * situations.
655 	 */
656 	int focus_child;
657 
658 	enum tog_view_mode mode;
659 	/* type-specific state */
660 	enum tog_view_type type;
661 	union {
662 		struct tog_diff_view_state diff;
663 		struct tog_log_view_state log;
664 		struct tog_blame_view_state blame;
665 		struct tog_tree_view_state tree;
666 		struct tog_ref_view_state ref;
667 		struct tog_help_view_state help;
668 	} state;
669 
670 	const struct got_error *(*show)(struct tog_view *);
671 	const struct got_error *(*input)(struct tog_view **,
672 	    struct tog_view *, int);
673 	const struct got_error *(*reset)(struct tog_view *);
674 	const struct got_error *(*resize)(struct tog_view *, int);
675 	const struct got_error *(*close)(struct tog_view *);
676 
677 	const struct got_error *(*search_start)(struct tog_view *);
678 	const struct got_error *(*search_next)(struct tog_view *);
679 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
680 	    int **, int **, int **, int **);
681 	int search_started;
682 	int searching;
683 #define TOG_SEARCH_FORWARD	1
684 #define TOG_SEARCH_BACKWARD	2
685 	int search_next_done;
686 #define TOG_SEARCH_HAVE_MORE	1
687 #define TOG_SEARCH_NO_MORE	2
688 #define TOG_SEARCH_HAVE_NONE	3
689 	regex_t regex;
690 	regmatch_t regmatch;
691 };
692 
693 static const struct got_error *open_diff_view(struct tog_view *,
694     struct got_object_id *, struct got_object_id *,
695     const char *, const char *, int, int, int, struct tog_view *,
696     struct got_repository *);
697 static const struct got_error *show_diff_view(struct tog_view *);
698 static const struct got_error *input_diff_view(struct tog_view **,
699     struct tog_view *, int);
700 static const struct got_error *reset_diff_view(struct tog_view *);
701 static const struct got_error* close_diff_view(struct tog_view *);
702 static const struct got_error *search_start_diff_view(struct tog_view *);
703 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
704     size_t *, int **, int **, int **, int **);
705 static const struct got_error *search_next_view_match(struct tog_view *);
706 
707 static const struct got_error *open_log_view(struct tog_view *,
708     struct got_object_id *, struct got_repository *,
709     const char *, const char *, int);
710 static const struct got_error * show_log_view(struct tog_view *);
711 static const struct got_error *input_log_view(struct tog_view **,
712     struct tog_view *, int);
713 static const struct got_error *resize_log_view(struct tog_view *, int);
714 static const struct got_error *close_log_view(struct tog_view *);
715 static const struct got_error *search_start_log_view(struct tog_view *);
716 static const struct got_error *search_next_log_view(struct tog_view *);
717 
718 static const struct got_error *open_blame_view(struct tog_view *, char *,
719     struct got_object_id *, struct got_repository *);
720 static const struct got_error *show_blame_view(struct tog_view *);
721 static const struct got_error *input_blame_view(struct tog_view **,
722     struct tog_view *, int);
723 static const struct got_error *reset_blame_view(struct tog_view *);
724 static const struct got_error *close_blame_view(struct tog_view *);
725 static const struct got_error *search_start_blame_view(struct tog_view *);
726 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
727     size_t *, int **, int **, int **, int **);
728 
729 static const struct got_error *open_tree_view(struct tog_view *,
730     struct got_object_id *, const char *, struct got_repository *);
731 static const struct got_error *show_tree_view(struct tog_view *);
732 static const struct got_error *input_tree_view(struct tog_view **,
733     struct tog_view *, int);
734 static const struct got_error *close_tree_view(struct tog_view *);
735 static const struct got_error *search_start_tree_view(struct tog_view *);
736 static const struct got_error *search_next_tree_view(struct tog_view *);
737 
738 static const struct got_error *open_ref_view(struct tog_view *,
739     struct got_repository *);
740 static const struct got_error *show_ref_view(struct tog_view *);
741 static const struct got_error *input_ref_view(struct tog_view **,
742     struct tog_view *, int);
743 static const struct got_error *close_ref_view(struct tog_view *);
744 static const struct got_error *search_start_ref_view(struct tog_view *);
745 static const struct got_error *search_next_ref_view(struct tog_view *);
746 
747 static const struct got_error *open_help_view(struct tog_view *,
748     struct tog_view *);
749 static const struct got_error *show_help_view(struct tog_view *);
750 static const struct got_error *input_help_view(struct tog_view **,
751     struct tog_view *, int);
752 static const struct got_error *reset_help_view(struct tog_view *);
753 static const struct got_error* close_help_view(struct tog_view *);
754 static const struct got_error *search_start_help_view(struct tog_view *);
755 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
756     size_t *, int **, int **, int **, int **);
757 
758 static volatile sig_atomic_t tog_sigwinch_received;
759 static volatile sig_atomic_t tog_sigpipe_received;
760 static volatile sig_atomic_t tog_sigcont_received;
761 static volatile sig_atomic_t tog_sigint_received;
762 static volatile sig_atomic_t tog_sigterm_received;
763 
764 static void
765 tog_sigwinch(int signo)
766 {
767 	tog_sigwinch_received = 1;
768 }
769 
770 static void
771 tog_sigpipe(int signo)
772 {
773 	tog_sigpipe_received = 1;
774 }
775 
776 static void
777 tog_sigcont(int signo)
778 {
779 	tog_sigcont_received = 1;
780 }
781 
782 static void
783 tog_sigint(int signo)
784 {
785 	tog_sigint_received = 1;
786 }
787 
788 static void
789 tog_sigterm(int signo)
790 {
791 	tog_sigterm_received = 1;
792 }
793 
794 static int
795 tog_fatal_signal_received(void)
796 {
797 	return (tog_sigpipe_received ||
798 	    tog_sigint_received || tog_sigterm_received);
799 }
800 
801 static const struct got_error *
802 view_close(struct tog_view *view)
803 {
804 	const struct got_error *err = NULL, *child_err = NULL;
805 
806 	if (view->child) {
807 		child_err = view_close(view->child);
808 		view->child = NULL;
809 	}
810 	if (view->close)
811 		err = view->close(view);
812 	if (view->panel)
813 		del_panel(view->panel);
814 	if (view->window)
815 		delwin(view->window);
816 	free(view);
817 	return err ? err : child_err;
818 }
819 
820 static struct tog_view *
821 view_open(int nlines, int ncols, int begin_y, int begin_x,
822     enum tog_view_type type)
823 {
824 	struct tog_view *view = calloc(1, sizeof(*view));
825 
826 	if (view == NULL)
827 		return NULL;
828 
829 	view->type = type;
830 	view->lines = LINES;
831 	view->cols = COLS;
832 	view->nlines = nlines ? nlines : LINES - begin_y;
833 	view->ncols = ncols ? ncols : COLS - begin_x;
834 	view->begin_y = begin_y;
835 	view->begin_x = begin_x;
836 	view->window = newwin(nlines, ncols, begin_y, begin_x);
837 	if (view->window == NULL) {
838 		view_close(view);
839 		return NULL;
840 	}
841 	view->panel = new_panel(view->window);
842 	if (view->panel == NULL ||
843 	    set_panel_userptr(view->panel, view) != OK) {
844 		view_close(view);
845 		return NULL;
846 	}
847 
848 	keypad(view->window, TRUE);
849 	return view;
850 }
851 
852 static int
853 view_split_begin_x(int begin_x)
854 {
855 	if (begin_x > 0 || COLS < 120)
856 		return 0;
857 	return (COLS - MAX(COLS / 2, 80));
858 }
859 
860 /* XXX Stub till we decide what to do. */
861 static int
862 view_split_begin_y(int lines)
863 {
864 	return lines * HSPLIT_SCALE;
865 }
866 
867 static const struct got_error *view_resize(struct tog_view *);
868 
869 static const struct got_error *
870 view_splitscreen(struct tog_view *view)
871 {
872 	const struct got_error *err = NULL;
873 
874 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
875 		if (view->resized_y && view->resized_y < view->lines)
876 			view->begin_y = view->resized_y;
877 		else
878 			view->begin_y = view_split_begin_y(view->nlines);
879 		view->begin_x = 0;
880 	} else if (!view->resized) {
881 		if (view->resized_x && view->resized_x < view->cols - 1 &&
882 		    view->cols > 119)
883 			view->begin_x = view->resized_x;
884 		else
885 			view->begin_x = view_split_begin_x(0);
886 		view->begin_y = 0;
887 	}
888 	view->nlines = LINES - view->begin_y;
889 	view->ncols = COLS - view->begin_x;
890 	view->lines = LINES;
891 	view->cols = COLS;
892 	err = view_resize(view);
893 	if (err)
894 		return err;
895 
896 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
897 		view->parent->nlines = view->begin_y;
898 
899 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
900 		return got_error_from_errno("mvwin");
901 
902 	return NULL;
903 }
904 
905 static const struct got_error *
906 view_fullscreen(struct tog_view *view)
907 {
908 	const struct got_error *err = NULL;
909 
910 	view->begin_x = 0;
911 	view->begin_y = view->resized ? view->begin_y : 0;
912 	view->nlines = view->resized ? view->nlines : LINES;
913 	view->ncols = COLS;
914 	view->lines = LINES;
915 	view->cols = COLS;
916 	err = view_resize(view);
917 	if (err)
918 		return err;
919 
920 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
921 		return got_error_from_errno("mvwin");
922 
923 	return NULL;
924 }
925 
926 static int
927 view_is_parent_view(struct tog_view *view)
928 {
929 	return view->parent == NULL;
930 }
931 
932 static int
933 view_is_splitscreen(struct tog_view *view)
934 {
935 	return view->begin_x > 0 || view->begin_y > 0;
936 }
937 
938 static int
939 view_is_fullscreen(struct tog_view *view)
940 {
941 	return view->nlines == LINES && view->ncols == COLS;
942 }
943 
944 static int
945 view_is_hsplit_top(struct tog_view *view)
946 {
947 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
948 	    view_is_splitscreen(view->child);
949 }
950 
951 static void
952 view_border(struct tog_view *view)
953 {
954 	PANEL *panel;
955 	const struct tog_view *view_above;
956 
957 	if (view->parent)
958 		return view_border(view->parent);
959 
960 	panel = panel_above(view->panel);
961 	if (panel == NULL)
962 		return;
963 
964 	view_above = panel_userptr(panel);
965 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
966 		mvwhline(view->window, view_above->begin_y - 1,
967 		    view->begin_x, got_locale_is_utf8() ?
968 		    ACS_HLINE : '-', view->ncols);
969 	else
970 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
971 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
972 }
973 
974 static const struct got_error *view_init_hsplit(struct tog_view *, int);
975 static const struct got_error *request_log_commits(struct tog_view *);
976 static const struct got_error *offset_selection_down(struct tog_view *);
977 static void offset_selection_up(struct tog_view *);
978 static void view_get_split(struct tog_view *, int *, int *);
979 
980 static const struct got_error *
981 view_resize(struct tog_view *view)
982 {
983 	const struct got_error	*err = NULL;
984 	int			 dif, nlines, ncols;
985 
986 	dif = LINES - view->lines;  /* line difference */
987 
988 	if (view->lines > LINES)
989 		nlines = view->nlines - (view->lines - LINES);
990 	else
991 		nlines = view->nlines + (LINES - view->lines);
992 	if (view->cols > COLS)
993 		ncols = view->ncols - (view->cols - COLS);
994 	else
995 		ncols = view->ncols + (COLS - view->cols);
996 
997 	if (view->child) {
998 		int hs = view->child->begin_y;
999 
1000 		if (!view_is_fullscreen(view))
1001 			view->child->begin_x = view_split_begin_x(view->begin_x);
1002 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1003 		    view->child->begin_x == 0) {
1004 			ncols = COLS;
1005 
1006 			view_fullscreen(view->child);
1007 			if (view->child->focussed)
1008 				show_panel(view->child->panel);
1009 			else
1010 				show_panel(view->panel);
1011 		} else {
1012 			ncols = view->child->begin_x;
1013 
1014 			view_splitscreen(view->child);
1015 			show_panel(view->child->panel);
1016 		}
1017 		/*
1018 		 * XXX This is ugly and needs to be moved into the above
1019 		 * logic but "works" for now and my attempts at moving it
1020 		 * break either 'tab' or 'F' key maps in horizontal splits.
1021 		 */
1022 		if (hs) {
1023 			err = view_splitscreen(view->child);
1024 			if (err)
1025 				return err;
1026 			if (dif < 0) { /* top split decreased */
1027 				err = offset_selection_down(view);
1028 				if (err)
1029 					return err;
1030 			}
1031 			view_border(view);
1032 			update_panels();
1033 			doupdate();
1034 			show_panel(view->child->panel);
1035 			nlines = view->nlines;
1036 		}
1037 	} else if (view->parent == NULL)
1038 		ncols = COLS;
1039 
1040 	if (view->resize && dif > 0) {
1041 		err = view->resize(view, dif);
1042 		if (err)
1043 			return err;
1044 	}
1045 
1046 	if (wresize(view->window, nlines, ncols) == ERR)
1047 		return got_error_from_errno("wresize");
1048 	if (replace_panel(view->panel, view->window) == ERR)
1049 		return got_error_from_errno("replace_panel");
1050 	wclear(view->window);
1051 
1052 	view->nlines = nlines;
1053 	view->ncols = ncols;
1054 	view->lines = LINES;
1055 	view->cols = COLS;
1056 
1057 	return NULL;
1058 }
1059 
1060 static const struct got_error *
1061 resize_log_view(struct tog_view *view, int increase)
1062 {
1063 	struct tog_log_view_state	*s = &view->state.log;
1064 	const struct got_error		*err = NULL;
1065 	int				 n = 0;
1066 
1067 	if (s->selected_entry)
1068 		n = s->selected_entry->idx + view->lines - s->selected;
1069 
1070 	/*
1071 	 * Request commits to account for the increased
1072 	 * height so we have enough to populate the view.
1073 	 */
1074 	if (s->commits->ncommits < n) {
1075 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1076 		err = request_log_commits(view);
1077 	}
1078 
1079 	return err;
1080 }
1081 
1082 static void
1083 view_adjust_offset(struct tog_view *view, int n)
1084 {
1085 	if (n == 0)
1086 		return;
1087 
1088 	if (view->parent && view->parent->offset) {
1089 		if (view->parent->offset + n >= 0)
1090 			view->parent->offset += n;
1091 		else
1092 			view->parent->offset = 0;
1093 	} else if (view->offset) {
1094 		if (view->offset - n >= 0)
1095 			view->offset -= n;
1096 		else
1097 			view->offset = 0;
1098 	}
1099 }
1100 
1101 static const struct got_error *
1102 view_resize_split(struct tog_view *view, int resize)
1103 {
1104 	const struct got_error	*err = NULL;
1105 	struct tog_view		*v = NULL;
1106 
1107 	if (view->parent)
1108 		v = view->parent;
1109 	else
1110 		v = view;
1111 
1112 	if (!v->child || !view_is_splitscreen(v->child))
1113 		return NULL;
1114 
1115 	v->resized = v->child->resized = resize;  /* lock for resize event */
1116 
1117 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1118 		if (v->child->resized_y)
1119 			v->child->begin_y = v->child->resized_y;
1120 		if (view->parent)
1121 			v->child->begin_y -= resize;
1122 		else
1123 			v->child->begin_y += resize;
1124 		if (v->child->begin_y < 3) {
1125 			view->count = 0;
1126 			v->child->begin_y = 3;
1127 		} else if (v->child->begin_y > LINES - 1) {
1128 			view->count = 0;
1129 			v->child->begin_y = LINES - 1;
1130 		}
1131 		v->ncols = COLS;
1132 		v->child->ncols = COLS;
1133 		view_adjust_offset(view, resize);
1134 		err = view_init_hsplit(v, v->child->begin_y);
1135 		if (err)
1136 			return err;
1137 		v->child->resized_y = v->child->begin_y;
1138 	} else {
1139 		if (v->child->resized_x)
1140 			v->child->begin_x = v->child->resized_x;
1141 		if (view->parent)
1142 			v->child->begin_x -= resize;
1143 		else
1144 			v->child->begin_x += resize;
1145 		if (v->child->begin_x < 11) {
1146 			view->count = 0;
1147 			v->child->begin_x = 11;
1148 		} else if (v->child->begin_x > COLS - 1) {
1149 			view->count = 0;
1150 			v->child->begin_x = COLS - 1;
1151 		}
1152 		v->child->resized_x = v->child->begin_x;
1153 	}
1154 
1155 	v->child->mode = v->mode;
1156 	v->child->nlines = v->lines - v->child->begin_y;
1157 	v->child->ncols = v->cols - v->child->begin_x;
1158 	v->focus_child = 1;
1159 
1160 	err = view_fullscreen(v);
1161 	if (err)
1162 		return err;
1163 	err = view_splitscreen(v->child);
1164 	if (err)
1165 		return err;
1166 
1167 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1168 		err = offset_selection_down(v->child);
1169 		if (err)
1170 			return err;
1171 	}
1172 
1173 	if (v->resize)
1174 		err = v->resize(v, 0);
1175 	else if (v->child->resize)
1176 		err = v->child->resize(v->child, 0);
1177 
1178 	v->resized = v->child->resized = 0;
1179 
1180 	return err;
1181 }
1182 
1183 static void
1184 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1185 {
1186 	struct tog_view *v = src->child ? src->child : src;
1187 
1188 	dst->resized_x = v->resized_x;
1189 	dst->resized_y = v->resized_y;
1190 }
1191 
1192 static const struct got_error *
1193 view_close_child(struct tog_view *view)
1194 {
1195 	const struct got_error *err = NULL;
1196 
1197 	if (view->child == NULL)
1198 		return NULL;
1199 
1200 	err = view_close(view->child);
1201 	view->child = NULL;
1202 	return err;
1203 }
1204 
1205 static const struct got_error *
1206 view_set_child(struct tog_view *view, struct tog_view *child)
1207 {
1208 	const struct got_error *err = NULL;
1209 
1210 	view->child = child;
1211 	child->parent = view;
1212 
1213 	err = view_resize(view);
1214 	if (err)
1215 		return err;
1216 
1217 	if (view->child->resized_x || view->child->resized_y)
1218 		err = view_resize_split(view, 0);
1219 
1220 	return err;
1221 }
1222 
1223 static const struct got_error *view_dispatch_request(struct tog_view **,
1224     struct tog_view *, enum tog_view_type, int, int);
1225 
1226 static const struct got_error *
1227 view_request_new(struct tog_view **requested, struct tog_view *view,
1228     enum tog_view_type request)
1229 {
1230 	struct tog_view		*new_view = NULL;
1231 	const struct got_error	*err;
1232 	int			 y = 0, x = 0;
1233 
1234 	*requested = NULL;
1235 
1236 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1237 		view_get_split(view, &y, &x);
1238 
1239 	err = view_dispatch_request(&new_view, view, request, y, x);
1240 	if (err)
1241 		return err;
1242 
1243 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1244 	    request != TOG_VIEW_HELP) {
1245 		err = view_init_hsplit(view, y);
1246 		if (err)
1247 			return err;
1248 	}
1249 
1250 	view->focussed = 0;
1251 	new_view->focussed = 1;
1252 	new_view->mode = view->mode;
1253 	new_view->nlines = request == TOG_VIEW_HELP ?
1254 	    view->lines : view->lines - y;
1255 
1256 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1257 		view_transfer_size(new_view, view);
1258 		err = view_close_child(view);
1259 		if (err)
1260 			return err;
1261 		err = view_set_child(view, new_view);
1262 		if (err)
1263 			return err;
1264 		view->focus_child = 1;
1265 	} else
1266 		*requested = new_view;
1267 
1268 	return NULL;
1269 }
1270 
1271 static void
1272 tog_resizeterm(void)
1273 {
1274 	int cols, lines;
1275 	struct winsize size;
1276 
1277 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1278 		cols = 80;     /* Default */
1279 		lines = 24;
1280 	} else {
1281 		cols = size.ws_col;
1282 		lines = size.ws_row;
1283 	}
1284 	resize_term(lines, cols);
1285 }
1286 
1287 static const struct got_error *
1288 view_search_start(struct tog_view *view)
1289 {
1290 	const struct got_error *err = NULL;
1291 	struct tog_view *v = view;
1292 	char pattern[1024];
1293 	int ret;
1294 
1295 	if (view->search_started) {
1296 		regfree(&view->regex);
1297 		view->searching = 0;
1298 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1299 	}
1300 	view->search_started = 0;
1301 
1302 	if (view->nlines < 1)
1303 		return NULL;
1304 
1305 	if (view_is_hsplit_top(view))
1306 		v = view->child;
1307 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1308 		v = view->parent;
1309 
1310 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1311 	wclrtoeol(v->window);
1312 
1313 	nodelay(v->window, FALSE);  /* block for search term input */
1314 	nocbreak();
1315 	echo();
1316 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1317 	wrefresh(v->window);
1318 	cbreak();
1319 	noecho();
1320 	nodelay(v->window, TRUE);
1321 	if (ret == ERR)
1322 		return NULL;
1323 
1324 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1325 		err = view->search_start(view);
1326 		if (err) {
1327 			regfree(&view->regex);
1328 			return err;
1329 		}
1330 		view->search_started = 1;
1331 		view->searching = TOG_SEARCH_FORWARD;
1332 		view->search_next_done = 0;
1333 		view->search_next(view);
1334 	}
1335 
1336 	return NULL;
1337 }
1338 
1339 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1340 static const struct got_error *
1341 switch_split(struct tog_view *view)
1342 {
1343 	const struct got_error	*err = NULL;
1344 	struct tog_view		*v = NULL;
1345 
1346 	if (view->parent)
1347 		v = view->parent;
1348 	else
1349 		v = view;
1350 
1351 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1352 		v->mode = TOG_VIEW_SPLIT_VERT;
1353 	else
1354 		v->mode = TOG_VIEW_SPLIT_HRZN;
1355 
1356 	if (!v->child)
1357 		return NULL;
1358 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1359 		v->mode = TOG_VIEW_SPLIT_NONE;
1360 
1361 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1362 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1363 		v->child->begin_y = v->child->resized_y;
1364 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1365 		v->child->begin_x = v->child->resized_x;
1366 
1367 
1368 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1369 		v->ncols = COLS;
1370 		v->child->ncols = COLS;
1371 		v->child->nscrolled = LINES - v->child->nlines;
1372 
1373 		err = view_init_hsplit(v, v->child->begin_y);
1374 		if (err)
1375 			return err;
1376 	}
1377 	v->child->mode = v->mode;
1378 	v->child->nlines = v->lines - v->child->begin_y;
1379 	v->focus_child = 1;
1380 
1381 	err = view_fullscreen(v);
1382 	if (err)
1383 		return err;
1384 	err = view_splitscreen(v->child);
1385 	if (err)
1386 		return err;
1387 
1388 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1389 		v->mode = TOG_VIEW_SPLIT_VERT;
1390 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1391 		err = offset_selection_down(v);
1392 		if (err)
1393 			return err;
1394 		err = offset_selection_down(v->child);
1395 		if (err)
1396 			return err;
1397 	} else {
1398 		offset_selection_up(v);
1399 		offset_selection_up(v->child);
1400 	}
1401 	if (v->resize)
1402 		err = v->resize(v, 0);
1403 	else if (v->child->resize)
1404 		err = v->child->resize(v->child, 0);
1405 
1406 	return err;
1407 }
1408 
1409 /*
1410  * Compute view->count from numeric input. Assign total to view->count and
1411  * return first non-numeric key entered.
1412  */
1413 static int
1414 get_compound_key(struct tog_view *view, int c)
1415 {
1416 	struct tog_view	*v = view;
1417 	int		 x, n = 0;
1418 
1419 	if (view_is_hsplit_top(view))
1420 		v = view->child;
1421 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1422 		v = view->parent;
1423 
1424 	view->count = 0;
1425 	cbreak();  /* block for input */
1426 	nodelay(view->window, FALSE);
1427 	wmove(v->window, v->nlines - 1, 0);
1428 	wclrtoeol(v->window);
1429 	waddch(v->window, ':');
1430 
1431 	do {
1432 		x = getcurx(v->window);
1433 		if (x != ERR && x < view->ncols) {
1434 			waddch(v->window, c);
1435 			wrefresh(v->window);
1436 		}
1437 
1438 		/*
1439 		 * Don't overflow. Max valid request should be the greatest
1440 		 * between the longest and total lines; cap at 10 million.
1441 		 */
1442 		if (n >= 9999999)
1443 			n = 9999999;
1444 		else
1445 			n = n * 10 + (c - '0');
1446 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1447 
1448 	if (c == 'G' || c == 'g') {	/* nG key map */
1449 		view->gline = view->hiline = n;
1450 		n = 0;
1451 		c = 0;
1452 	}
1453 
1454 	/* Massage excessive or inapplicable values at the input handler. */
1455 	view->count = n;
1456 
1457 	return c;
1458 }
1459 
1460 static const struct got_error *
1461 view_input(struct tog_view **new, int *done, struct tog_view *view,
1462     struct tog_view_list_head *views)
1463 {
1464 	const struct got_error *err = NULL;
1465 	struct tog_view *v;
1466 	int ch, errcode;
1467 
1468 	*new = NULL;
1469 
1470 	/* Clear "no matches" indicator. */
1471 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1472 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1473 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1474 		view->count = 0;
1475 	}
1476 
1477 	if (view->searching && !view->search_next_done) {
1478 		errcode = pthread_mutex_unlock(&tog_mutex);
1479 		if (errcode)
1480 			return got_error_set_errno(errcode,
1481 			    "pthread_mutex_unlock");
1482 		sched_yield();
1483 		errcode = pthread_mutex_lock(&tog_mutex);
1484 		if (errcode)
1485 			return got_error_set_errno(errcode,
1486 			    "pthread_mutex_lock");
1487 		view->search_next(view);
1488 		return NULL;
1489 	}
1490 
1491 	/* Allow threads to make progress while we are waiting for input. */
1492 	errcode = pthread_mutex_unlock(&tog_mutex);
1493 	if (errcode)
1494 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1495 	/* If we have an unfinished count, let C-g or backspace abort. */
1496 	if (view->count && --view->count) {
1497 		cbreak();
1498 		nodelay(view->window, TRUE);
1499 		ch = wgetch(view->window);
1500 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1501 			view->count = 0;
1502 		else
1503 			ch = view->ch;
1504 	} else {
1505 		ch = wgetch(view->window);
1506 		if (ch >= '1' && ch  <= '9')
1507 			view->ch = ch = get_compound_key(view, ch);
1508 	}
1509 	if (view->hiline && ch != ERR && ch != 0)
1510 		view->hiline = 0;  /* key pressed, clear line highlight */
1511 	nodelay(view->window, TRUE);
1512 	errcode = pthread_mutex_lock(&tog_mutex);
1513 	if (errcode)
1514 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1515 
1516 	if (tog_sigwinch_received || tog_sigcont_received) {
1517 		tog_resizeterm();
1518 		tog_sigwinch_received = 0;
1519 		tog_sigcont_received = 0;
1520 		TAILQ_FOREACH(v, views, entry) {
1521 			err = view_resize(v);
1522 			if (err)
1523 				return err;
1524 			err = v->input(new, v, KEY_RESIZE);
1525 			if (err)
1526 				return err;
1527 			if (v->child) {
1528 				err = view_resize(v->child);
1529 				if (err)
1530 					return err;
1531 				err = v->child->input(new, v->child,
1532 				    KEY_RESIZE);
1533 				if (err)
1534 					return err;
1535 				if (v->child->resized_x || v->child->resized_y) {
1536 					err = view_resize_split(v, 0);
1537 					if (err)
1538 						return err;
1539 				}
1540 			}
1541 		}
1542 	}
1543 
1544 	switch (ch) {
1545 	case '?':
1546 	case 'H':
1547 	case KEY_F(1):
1548 		if (view->type == TOG_VIEW_HELP)
1549 			err = view->reset(view);
1550 		else
1551 			err = view_request_new(new, view, TOG_VIEW_HELP);
1552 		break;
1553 	case '\t':
1554 		view->count = 0;
1555 		if (view->child) {
1556 			view->focussed = 0;
1557 			view->child->focussed = 1;
1558 			view->focus_child = 1;
1559 		} else if (view->parent) {
1560 			view->focussed = 0;
1561 			view->parent->focussed = 1;
1562 			view->parent->focus_child = 0;
1563 			if (!view_is_splitscreen(view)) {
1564 				if (view->parent->resize) {
1565 					err = view->parent->resize(view->parent,
1566 					    0);
1567 					if (err)
1568 						return err;
1569 				}
1570 				offset_selection_up(view->parent);
1571 				err = view_fullscreen(view->parent);
1572 				if (err)
1573 					return err;
1574 			}
1575 		}
1576 		break;
1577 	case 'q':
1578 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1579 			if (view->parent->resize) {
1580 				/* might need more commits to fill fullscreen */
1581 				err = view->parent->resize(view->parent, 0);
1582 				if (err)
1583 					break;
1584 			}
1585 			offset_selection_up(view->parent);
1586 		}
1587 		err = view->input(new, view, ch);
1588 		view->dying = 1;
1589 		break;
1590 	case 'Q':
1591 		*done = 1;
1592 		break;
1593 	case 'F':
1594 		view->count = 0;
1595 		if (view_is_parent_view(view)) {
1596 			if (view->child == NULL)
1597 				break;
1598 			if (view_is_splitscreen(view->child)) {
1599 				view->focussed = 0;
1600 				view->child->focussed = 1;
1601 				err = view_fullscreen(view->child);
1602 			} else {
1603 				err = view_splitscreen(view->child);
1604 				if (!err)
1605 					err = view_resize_split(view, 0);
1606 			}
1607 			if (err)
1608 				break;
1609 			err = view->child->input(new, view->child,
1610 			    KEY_RESIZE);
1611 		} else {
1612 			if (view_is_splitscreen(view)) {
1613 				view->parent->focussed = 0;
1614 				view->focussed = 1;
1615 				err = view_fullscreen(view);
1616 			} else {
1617 				err = view_splitscreen(view);
1618 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1619 					err = view_resize(view->parent);
1620 				if (!err)
1621 					err = view_resize_split(view, 0);
1622 			}
1623 			if (err)
1624 				break;
1625 			err = view->input(new, view, KEY_RESIZE);
1626 		}
1627 		if (err)
1628 			break;
1629 		if (view->resize) {
1630 			err = view->resize(view, 0);
1631 			if (err)
1632 				break;
1633 		}
1634 		if (view->parent)
1635 			err = offset_selection_down(view->parent);
1636 		if (!err)
1637 			err = offset_selection_down(view);
1638 		break;
1639 	case 'S':
1640 		view->count = 0;
1641 		err = switch_split(view);
1642 		break;
1643 	case '-':
1644 		err = view_resize_split(view, -1);
1645 		break;
1646 	case '+':
1647 		err = view_resize_split(view, 1);
1648 		break;
1649 	case KEY_RESIZE:
1650 		break;
1651 	case '/':
1652 		view->count = 0;
1653 		if (view->search_start)
1654 			view_search_start(view);
1655 		else
1656 			err = view->input(new, view, ch);
1657 		break;
1658 	case 'N':
1659 	case 'n':
1660 		if (view->search_started && view->search_next) {
1661 			view->searching = (ch == 'n' ?
1662 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1663 			view->search_next_done = 0;
1664 			view->search_next(view);
1665 		} else
1666 			err = view->input(new, view, ch);
1667 		break;
1668 	case 'A':
1669 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1670 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1671 		else
1672 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1673 		TAILQ_FOREACH(v, views, entry) {
1674 			if (v->reset) {
1675 				err = v->reset(v);
1676 				if (err)
1677 					return err;
1678 			}
1679 			if (v->child && v->child->reset) {
1680 				err = v->child->reset(v->child);
1681 				if (err)
1682 					return err;
1683 			}
1684 		}
1685 		break;
1686 	default:
1687 		err = view->input(new, view, ch);
1688 		break;
1689 	}
1690 
1691 	return err;
1692 }
1693 
1694 static int
1695 view_needs_focus_indication(struct tog_view *view)
1696 {
1697 	if (view_is_parent_view(view)) {
1698 		if (view->child == NULL || view->child->focussed)
1699 			return 0;
1700 		if (!view_is_splitscreen(view->child))
1701 			return 0;
1702 	} else if (!view_is_splitscreen(view))
1703 		return 0;
1704 
1705 	return view->focussed;
1706 }
1707 
1708 static const struct got_error *
1709 view_loop(struct tog_view *view)
1710 {
1711 	const struct got_error *err = NULL;
1712 	struct tog_view_list_head views;
1713 	struct tog_view *new_view;
1714 	char *mode;
1715 	int fast_refresh = 10;
1716 	int done = 0, errcode;
1717 
1718 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1719 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1720 		view->mode = TOG_VIEW_SPLIT_VERT;
1721 	else
1722 		view->mode = TOG_VIEW_SPLIT_HRZN;
1723 
1724 	errcode = pthread_mutex_lock(&tog_mutex);
1725 	if (errcode)
1726 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1727 
1728 	TAILQ_INIT(&views);
1729 	TAILQ_INSERT_HEAD(&views, view, entry);
1730 
1731 	view->focussed = 1;
1732 	err = view->show(view);
1733 	if (err)
1734 		return err;
1735 	update_panels();
1736 	doupdate();
1737 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1738 	    !tog_fatal_signal_received()) {
1739 		/* Refresh fast during initialization, then become slower. */
1740 		if (fast_refresh && fast_refresh-- == 0)
1741 			halfdelay(10); /* switch to once per second */
1742 
1743 		err = view_input(&new_view, &done, view, &views);
1744 		if (err)
1745 			break;
1746 		if (view->dying) {
1747 			struct tog_view *v, *prev = NULL;
1748 
1749 			if (view_is_parent_view(view))
1750 				prev = TAILQ_PREV(view, tog_view_list_head,
1751 				    entry);
1752 			else if (view->parent)
1753 				prev = view->parent;
1754 
1755 			if (view->parent) {
1756 				view->parent->child = NULL;
1757 				view->parent->focus_child = 0;
1758 				/* Restore fullscreen line height. */
1759 				view->parent->nlines = view->parent->lines;
1760 				err = view_resize(view->parent);
1761 				if (err)
1762 					break;
1763 				/* Make resized splits persist. */
1764 				view_transfer_size(view->parent, view);
1765 			} else
1766 				TAILQ_REMOVE(&views, view, entry);
1767 
1768 			err = view_close(view);
1769 			if (err)
1770 				goto done;
1771 
1772 			view = NULL;
1773 			TAILQ_FOREACH(v, &views, entry) {
1774 				if (v->focussed)
1775 					break;
1776 			}
1777 			if (view == NULL && new_view == NULL) {
1778 				/* No view has focus. Try to pick one. */
1779 				if (prev)
1780 					view = prev;
1781 				else if (!TAILQ_EMPTY(&views)) {
1782 					view = TAILQ_LAST(&views,
1783 					    tog_view_list_head);
1784 				}
1785 				if (view) {
1786 					if (view->focus_child) {
1787 						view->child->focussed = 1;
1788 						view = view->child;
1789 					} else
1790 						view->focussed = 1;
1791 				}
1792 			}
1793 		}
1794 		if (new_view) {
1795 			struct tog_view *v, *t;
1796 			/* Only allow one parent view per type. */
1797 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1798 				if (v->type != new_view->type)
1799 					continue;
1800 				TAILQ_REMOVE(&views, v, entry);
1801 				err = view_close(v);
1802 				if (err)
1803 					goto done;
1804 				break;
1805 			}
1806 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1807 			view = new_view;
1808 		}
1809 		if (view) {
1810 			if (view_is_parent_view(view)) {
1811 				if (view->child && view->child->focussed)
1812 					view = view->child;
1813 			} else {
1814 				if (view->parent && view->parent->focussed)
1815 					view = view->parent;
1816 			}
1817 			show_panel(view->panel);
1818 			if (view->child && view_is_splitscreen(view->child))
1819 				show_panel(view->child->panel);
1820 			if (view->parent && view_is_splitscreen(view)) {
1821 				err = view->parent->show(view->parent);
1822 				if (err)
1823 					goto done;
1824 			}
1825 			err = view->show(view);
1826 			if (err)
1827 				goto done;
1828 			if (view->child) {
1829 				err = view->child->show(view->child);
1830 				if (err)
1831 					goto done;
1832 			}
1833 			update_panels();
1834 			doupdate();
1835 		}
1836 	}
1837 done:
1838 	while (!TAILQ_EMPTY(&views)) {
1839 		const struct got_error *close_err;
1840 		view = TAILQ_FIRST(&views);
1841 		TAILQ_REMOVE(&views, view, entry);
1842 		close_err = view_close(view);
1843 		if (close_err && err == NULL)
1844 			err = close_err;
1845 	}
1846 
1847 	errcode = pthread_mutex_unlock(&tog_mutex);
1848 	if (errcode && err == NULL)
1849 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1850 
1851 	return err;
1852 }
1853 
1854 __dead static void
1855 usage_log(void)
1856 {
1857 	endwin();
1858 	fprintf(stderr,
1859 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1860 	    getprogname());
1861 	exit(1);
1862 }
1863 
1864 /* Create newly allocated wide-character string equivalent to a byte string. */
1865 static const struct got_error *
1866 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1867 {
1868 	char *vis = NULL;
1869 	const struct got_error *err = NULL;
1870 
1871 	*ws = NULL;
1872 	*wlen = mbstowcs(NULL, s, 0);
1873 	if (*wlen == (size_t)-1) {
1874 		int vislen;
1875 		if (errno != EILSEQ)
1876 			return got_error_from_errno("mbstowcs");
1877 
1878 		/* byte string invalid in current encoding; try to "fix" it */
1879 		err = got_mbsavis(&vis, &vislen, s);
1880 		if (err)
1881 			return err;
1882 		*wlen = mbstowcs(NULL, vis, 0);
1883 		if (*wlen == (size_t)-1) {
1884 			err = got_error_from_errno("mbstowcs"); /* give up */
1885 			goto done;
1886 		}
1887 	}
1888 
1889 	*ws = calloc(*wlen + 1, sizeof(**ws));
1890 	if (*ws == NULL) {
1891 		err = got_error_from_errno("calloc");
1892 		goto done;
1893 	}
1894 
1895 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1896 		err = got_error_from_errno("mbstowcs");
1897 done:
1898 	free(vis);
1899 	if (err) {
1900 		free(*ws);
1901 		*ws = NULL;
1902 		*wlen = 0;
1903 	}
1904 	return err;
1905 }
1906 
1907 static const struct got_error *
1908 expand_tab(char **ptr, const char *src)
1909 {
1910 	char	*dst;
1911 	size_t	 len, n, idx = 0, sz = 0;
1912 
1913 	*ptr = NULL;
1914 	n = len = strlen(src);
1915 	dst = malloc(n + 1);
1916 	if (dst == NULL)
1917 		return got_error_from_errno("malloc");
1918 
1919 	while (idx < len && src[idx]) {
1920 		const char c = src[idx];
1921 
1922 		if (c == '\t') {
1923 			size_t nb = TABSIZE - sz % TABSIZE;
1924 			char *p;
1925 
1926 			p = realloc(dst, n + nb);
1927 			if (p == NULL) {
1928 				free(dst);
1929 				return got_error_from_errno("realloc");
1930 
1931 			}
1932 			dst = p;
1933 			n += nb;
1934 			memset(dst + sz, ' ', nb);
1935 			sz += nb;
1936 		} else
1937 			dst[sz++] = src[idx];
1938 		++idx;
1939 	}
1940 
1941 	dst[sz] = '\0';
1942 	*ptr = dst;
1943 	return NULL;
1944 }
1945 
1946 /*
1947  * Advance at most n columns from wline starting at offset off.
1948  * Return the index to the first character after the span operation.
1949  * Return the combined column width of all spanned wide character in
1950  * *rcol.
1951  */
1952 static int
1953 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1954 {
1955 	int width, i, cols = 0;
1956 
1957 	if (n == 0) {
1958 		*rcol = cols;
1959 		return off;
1960 	}
1961 
1962 	for (i = off; wline[i] != L'\0'; ++i) {
1963 		if (wline[i] == L'\t')
1964 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1965 		else
1966 			width = wcwidth(wline[i]);
1967 
1968 		if (width == -1) {
1969 			width = 1;
1970 			wline[i] = L'.';
1971 		}
1972 
1973 		if (cols + width > n)
1974 			break;
1975 		cols += width;
1976 	}
1977 
1978 	*rcol = cols;
1979 	return i;
1980 }
1981 
1982 /*
1983  * Format a line for display, ensuring that it won't overflow a width limit.
1984  * With scrolling, the width returned refers to the scrolled version of the
1985  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1986  */
1987 static const struct got_error *
1988 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1989     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1990 {
1991 	const struct got_error *err = NULL;
1992 	int cols;
1993 	wchar_t *wline = NULL;
1994 	char *exstr = NULL;
1995 	size_t wlen;
1996 	int i, scrollx;
1997 
1998 	*wlinep = NULL;
1999 	*widthp = 0;
2000 
2001 	if (expand) {
2002 		err = expand_tab(&exstr, line);
2003 		if (err)
2004 			return err;
2005 	}
2006 
2007 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2008 	free(exstr);
2009 	if (err)
2010 		return err;
2011 
2012 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2013 
2014 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2015 		wline[wlen - 1] = L'\0';
2016 		wlen--;
2017 	}
2018 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2019 		wline[wlen - 1] = L'\0';
2020 		wlen--;
2021 	}
2022 
2023 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2024 	wline[i] = L'\0';
2025 
2026 	if (widthp)
2027 		*widthp = cols;
2028 	if (scrollxp)
2029 		*scrollxp = scrollx;
2030 	if (err)
2031 		free(wline);
2032 	else
2033 		*wlinep = wline;
2034 	return err;
2035 }
2036 
2037 static const struct got_error*
2038 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2039     struct got_object_id *id, struct got_repository *repo)
2040 {
2041 	static const struct got_error *err = NULL;
2042 	struct got_reflist_entry *re;
2043 	char *s;
2044 	const char *name;
2045 
2046 	*refs_str = NULL;
2047 
2048 	TAILQ_FOREACH(re, refs, entry) {
2049 		struct got_tag_object *tag = NULL;
2050 		struct got_object_id *ref_id;
2051 		int cmp;
2052 
2053 		name = got_ref_get_name(re->ref);
2054 		if (strcmp(name, GOT_REF_HEAD) == 0)
2055 			continue;
2056 		if (strncmp(name, "refs/", 5) == 0)
2057 			name += 5;
2058 		if (strncmp(name, "got/", 4) == 0 &&
2059 		    strncmp(name, "got/backup/", 11) != 0)
2060 			continue;
2061 		if (strncmp(name, "heads/", 6) == 0)
2062 			name += 6;
2063 		if (strncmp(name, "remotes/", 8) == 0) {
2064 			name += 8;
2065 			s = strstr(name, "/" GOT_REF_HEAD);
2066 			if (s != NULL && s[strlen(s)] == '\0')
2067 				continue;
2068 		}
2069 		err = got_ref_resolve(&ref_id, repo, re->ref);
2070 		if (err)
2071 			break;
2072 		if (strncmp(name, "tags/", 5) == 0) {
2073 			err = got_object_open_as_tag(&tag, repo, ref_id);
2074 			if (err) {
2075 				if (err->code != GOT_ERR_OBJ_TYPE) {
2076 					free(ref_id);
2077 					break;
2078 				}
2079 				/* Ref points at something other than a tag. */
2080 				err = NULL;
2081 				tag = NULL;
2082 			}
2083 		}
2084 		cmp = got_object_id_cmp(tag ?
2085 		    got_object_tag_get_object_id(tag) : ref_id, id);
2086 		free(ref_id);
2087 		if (tag)
2088 			got_object_tag_close(tag);
2089 		if (cmp != 0)
2090 			continue;
2091 		s = *refs_str;
2092 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2093 		    s ? ", " : "", name) == -1) {
2094 			err = got_error_from_errno("asprintf");
2095 			free(s);
2096 			*refs_str = NULL;
2097 			break;
2098 		}
2099 		free(s);
2100 	}
2101 
2102 	return err;
2103 }
2104 
2105 static const struct got_error *
2106 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2107     int col_tab_align)
2108 {
2109 	char *smallerthan;
2110 
2111 	smallerthan = strchr(author, '<');
2112 	if (smallerthan && smallerthan[1] != '\0')
2113 		author = smallerthan + 1;
2114 	author[strcspn(author, "@>")] = '\0';
2115 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2116 	    col_tab_align, 0);
2117 }
2118 
2119 static const struct got_error *
2120 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2121     struct got_object_id *id, const size_t date_display_cols,
2122     int author_display_cols)
2123 {
2124 	struct tog_log_view_state *s = &view->state.log;
2125 	const struct got_error *err = NULL;
2126 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2127 	char *logmsg0 = NULL, *logmsg = NULL;
2128 	char *author = NULL;
2129 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2130 	int author_width, logmsg_width;
2131 	char *newline, *line = NULL;
2132 	int col, limit, scrollx;
2133 	const int avail = view->ncols;
2134 	struct tm tm;
2135 	time_t committer_time;
2136 	struct tog_color *tc;
2137 
2138 	committer_time = got_object_commit_get_committer_time(commit);
2139 	if (gmtime_r(&committer_time, &tm) == NULL)
2140 		return got_error_from_errno("gmtime_r");
2141 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2142 		return got_error(GOT_ERR_NO_SPACE);
2143 
2144 	if (avail <= date_display_cols)
2145 		limit = MIN(sizeof(datebuf) - 1, avail);
2146 	else
2147 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2148 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2149 	if (tc)
2150 		wattr_on(view->window,
2151 		    COLOR_PAIR(tc->colorpair), NULL);
2152 	waddnstr(view->window, datebuf, limit);
2153 	if (tc)
2154 		wattr_off(view->window,
2155 		    COLOR_PAIR(tc->colorpair), NULL);
2156 	col = limit;
2157 	if (col > avail)
2158 		goto done;
2159 
2160 	if (avail >= 120) {
2161 		char *id_str;
2162 		err = got_object_id_str(&id_str, id);
2163 		if (err)
2164 			goto done;
2165 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2166 		if (tc)
2167 			wattr_on(view->window,
2168 			    COLOR_PAIR(tc->colorpair), NULL);
2169 		wprintw(view->window, "%.8s ", id_str);
2170 		if (tc)
2171 			wattr_off(view->window,
2172 			    COLOR_PAIR(tc->colorpair), NULL);
2173 		free(id_str);
2174 		col += 9;
2175 		if (col > avail)
2176 			goto done;
2177 	}
2178 
2179 	if (s->use_committer)
2180 		author = strdup(got_object_commit_get_committer(commit));
2181 	else
2182 		author = strdup(got_object_commit_get_author(commit));
2183 	if (author == NULL) {
2184 		err = got_error_from_errno("strdup");
2185 		goto done;
2186 	}
2187 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2188 	if (err)
2189 		goto done;
2190 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2191 	if (tc)
2192 		wattr_on(view->window,
2193 		    COLOR_PAIR(tc->colorpair), NULL);
2194 	waddwstr(view->window, wauthor);
2195 	col += author_width;
2196 	while (col < avail && author_width < author_display_cols + 2) {
2197 		waddch(view->window, ' ');
2198 		col++;
2199 		author_width++;
2200 	}
2201 	if (tc)
2202 		wattr_off(view->window,
2203 		    COLOR_PAIR(tc->colorpair), NULL);
2204 	if (col > avail)
2205 		goto done;
2206 
2207 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2208 	if (err)
2209 		goto done;
2210 	logmsg = logmsg0;
2211 	while (*logmsg == '\n')
2212 		logmsg++;
2213 	newline = strchr(logmsg, '\n');
2214 	if (newline)
2215 		*newline = '\0';
2216 	limit = avail - col;
2217 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2218 		limit--;	/* for the border */
2219 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2220 	    limit, col, 1);
2221 	if (err)
2222 		goto done;
2223 	waddwstr(view->window, &wlogmsg[scrollx]);
2224 	col += MAX(logmsg_width, 0);
2225 	while (col < avail) {
2226 		waddch(view->window, ' ');
2227 		col++;
2228 	}
2229 done:
2230 	free(logmsg0);
2231 	free(wlogmsg);
2232 	free(author);
2233 	free(wauthor);
2234 	free(line);
2235 	return err;
2236 }
2237 
2238 static struct commit_queue_entry *
2239 alloc_commit_queue_entry(struct got_commit_object *commit,
2240     struct got_object_id *id)
2241 {
2242 	struct commit_queue_entry *entry;
2243 	struct got_object_id *dup;
2244 
2245 	entry = calloc(1, sizeof(*entry));
2246 	if (entry == NULL)
2247 		return NULL;
2248 
2249 	dup = got_object_id_dup(id);
2250 	if (dup == NULL) {
2251 		free(entry);
2252 		return NULL;
2253 	}
2254 
2255 	entry->id = dup;
2256 	entry->commit = commit;
2257 	return entry;
2258 }
2259 
2260 static void
2261 pop_commit(struct commit_queue *commits)
2262 {
2263 	struct commit_queue_entry *entry;
2264 
2265 	entry = TAILQ_FIRST(&commits->head);
2266 	TAILQ_REMOVE(&commits->head, entry, entry);
2267 	got_object_commit_close(entry->commit);
2268 	commits->ncommits--;
2269 	free(entry->id);
2270 	free(entry);
2271 }
2272 
2273 static void
2274 free_commits(struct commit_queue *commits)
2275 {
2276 	while (!TAILQ_EMPTY(&commits->head))
2277 		pop_commit(commits);
2278 }
2279 
2280 static const struct got_error *
2281 match_commit(int *have_match, struct got_object_id *id,
2282     struct got_commit_object *commit, regex_t *regex)
2283 {
2284 	const struct got_error *err = NULL;
2285 	regmatch_t regmatch;
2286 	char *id_str = NULL, *logmsg = NULL;
2287 
2288 	*have_match = 0;
2289 
2290 	err = got_object_id_str(&id_str, id);
2291 	if (err)
2292 		return err;
2293 
2294 	err = got_object_commit_get_logmsg(&logmsg, commit);
2295 	if (err)
2296 		goto done;
2297 
2298 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2299 	    &regmatch, 0) == 0 ||
2300 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2301 	    &regmatch, 0) == 0 ||
2302 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2303 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2304 		*have_match = 1;
2305 done:
2306 	free(id_str);
2307 	free(logmsg);
2308 	return err;
2309 }
2310 
2311 static const struct got_error *
2312 queue_commits(struct tog_log_thread_args *a)
2313 {
2314 	const struct got_error *err = NULL;
2315 
2316 	/*
2317 	 * We keep all commits open throughout the lifetime of the log
2318 	 * view in order to avoid having to re-fetch commits from disk
2319 	 * while updating the display.
2320 	 */
2321 	do {
2322 		struct got_object_id id;
2323 		struct got_commit_object *commit;
2324 		struct commit_queue_entry *entry;
2325 		int limit_match = 0;
2326 		int errcode;
2327 
2328 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2329 		    NULL, NULL);
2330 		if (err)
2331 			break;
2332 
2333 		err = got_object_open_as_commit(&commit, a->repo, &id);
2334 		if (err)
2335 			break;
2336 		entry = alloc_commit_queue_entry(commit, &id);
2337 		if (entry == NULL) {
2338 			err = got_error_from_errno("alloc_commit_queue_entry");
2339 			break;
2340 		}
2341 
2342 		errcode = pthread_mutex_lock(&tog_mutex);
2343 		if (errcode) {
2344 			err = got_error_set_errno(errcode,
2345 			    "pthread_mutex_lock");
2346 			break;
2347 		}
2348 
2349 		entry->idx = a->real_commits->ncommits;
2350 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2351 		a->real_commits->ncommits++;
2352 
2353 		if (*a->limiting) {
2354 			err = match_commit(&limit_match, &id, commit,
2355 			    a->limit_regex);
2356 			if (err)
2357 				break;
2358 
2359 			if (limit_match) {
2360 				struct commit_queue_entry *matched;
2361 
2362 				matched = alloc_commit_queue_entry(
2363 				    entry->commit, entry->id);
2364 				if (matched == NULL) {
2365 					err = got_error_from_errno(
2366 					    "alloc_commit_queue_entry");
2367 					break;
2368 				}
2369 				matched->commit = entry->commit;
2370 				got_object_commit_retain(entry->commit);
2371 
2372 				matched->idx = a->limit_commits->ncommits;
2373 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2374 				    matched, entry);
2375 				a->limit_commits->ncommits++;
2376 			}
2377 
2378 			/*
2379 			 * This is how we signal log_thread() that we
2380 			 * have found a match, and that it should be
2381 			 * counted as a new entry for the view.
2382 			 */
2383 			a->limit_match = limit_match;
2384 		}
2385 
2386 		if (*a->searching == TOG_SEARCH_FORWARD &&
2387 		    !*a->search_next_done) {
2388 			int have_match;
2389 			err = match_commit(&have_match, &id, commit, a->regex);
2390 			if (err)
2391 				break;
2392 
2393 			if (*a->limiting) {
2394 				if (limit_match && have_match)
2395 					*a->search_next_done =
2396 					    TOG_SEARCH_HAVE_MORE;
2397 			} else if (have_match)
2398 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2399 		}
2400 
2401 		errcode = pthread_mutex_unlock(&tog_mutex);
2402 		if (errcode && err == NULL)
2403 			err = got_error_set_errno(errcode,
2404 			    "pthread_mutex_unlock");
2405 		if (err)
2406 			break;
2407 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2408 
2409 	return err;
2410 }
2411 
2412 static void
2413 select_commit(struct tog_log_view_state *s)
2414 {
2415 	struct commit_queue_entry *entry;
2416 	int ncommits = 0;
2417 
2418 	entry = s->first_displayed_entry;
2419 	while (entry) {
2420 		if (ncommits == s->selected) {
2421 			s->selected_entry = entry;
2422 			break;
2423 		}
2424 		entry = TAILQ_NEXT(entry, entry);
2425 		ncommits++;
2426 	}
2427 }
2428 
2429 static const struct got_error *
2430 draw_commits(struct tog_view *view)
2431 {
2432 	const struct got_error *err = NULL;
2433 	struct tog_log_view_state *s = &view->state.log;
2434 	struct commit_queue_entry *entry = s->selected_entry;
2435 	int limit = view->nlines;
2436 	int width;
2437 	int ncommits, author_cols = 4;
2438 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2439 	char *refs_str = NULL;
2440 	wchar_t *wline;
2441 	struct tog_color *tc;
2442 	static const size_t date_display_cols = 12;
2443 
2444 	if (view_is_hsplit_top(view))
2445 		--limit;  /* account for border */
2446 
2447 	if (s->selected_entry &&
2448 	    !(view->searching && view->search_next_done == 0)) {
2449 		struct got_reflist_head *refs;
2450 		err = got_object_id_str(&id_str, s->selected_entry->id);
2451 		if (err)
2452 			return err;
2453 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2454 		    s->selected_entry->id);
2455 		if (refs) {
2456 			err = build_refs_str(&refs_str, refs,
2457 			    s->selected_entry->id, s->repo);
2458 			if (err)
2459 				goto done;
2460 		}
2461 	}
2462 
2463 	if (s->thread_args.commits_needed == 0)
2464 		halfdelay(10); /* disable fast refresh */
2465 
2466 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2467 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2468 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2469 		    (view->searching && !view->search_next_done) ?
2470 		    "searching..." : "loading...") == -1) {
2471 			err = got_error_from_errno("asprintf");
2472 			goto done;
2473 		}
2474 	} else {
2475 		const char *search_str = NULL;
2476 		const char *limit_str = NULL;
2477 
2478 		if (view->searching) {
2479 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2480 				search_str = "no more matches";
2481 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2482 				search_str = "no matches found";
2483 			else if (!view->search_next_done)
2484 				search_str = "searching...";
2485 		}
2486 
2487 		if (s->limit_view && s->commits->ncommits == 0)
2488 			limit_str = "no matches found";
2489 
2490 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2491 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2492 		    search_str ? search_str : (refs_str ? refs_str : ""),
2493 		    limit_str ? limit_str : "") == -1) {
2494 			err = got_error_from_errno("asprintf");
2495 			goto done;
2496 		}
2497 	}
2498 
2499 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2500 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2501 		    "........................................",
2502 		    s->in_repo_path, ncommits_str) == -1) {
2503 			err = got_error_from_errno("asprintf");
2504 			header = NULL;
2505 			goto done;
2506 		}
2507 	} else if (asprintf(&header, "commit %s%s",
2508 	    id_str ? id_str : "........................................",
2509 	    ncommits_str) == -1) {
2510 		err = got_error_from_errno("asprintf");
2511 		header = NULL;
2512 		goto done;
2513 	}
2514 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2515 	if (err)
2516 		goto done;
2517 
2518 	werase(view->window);
2519 
2520 	if (view_needs_focus_indication(view))
2521 		wstandout(view->window);
2522 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2523 	if (tc)
2524 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2525 	waddwstr(view->window, wline);
2526 	while (width < view->ncols) {
2527 		waddch(view->window, ' ');
2528 		width++;
2529 	}
2530 	if (tc)
2531 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2532 	if (view_needs_focus_indication(view))
2533 		wstandend(view->window);
2534 	free(wline);
2535 	if (limit <= 1)
2536 		goto done;
2537 
2538 	/* Grow author column size if necessary, and set view->maxx. */
2539 	entry = s->first_displayed_entry;
2540 	ncommits = 0;
2541 	view->maxx = 0;
2542 	while (entry) {
2543 		struct got_commit_object *c = entry->commit;
2544 		char *author, *eol, *msg, *msg0;
2545 		wchar_t *wauthor, *wmsg;
2546 		int width;
2547 		if (ncommits >= limit - 1)
2548 			break;
2549 		if (s->use_committer)
2550 			author = strdup(got_object_commit_get_committer(c));
2551 		else
2552 			author = strdup(got_object_commit_get_author(c));
2553 		if (author == NULL) {
2554 			err = got_error_from_errno("strdup");
2555 			goto done;
2556 		}
2557 		err = format_author(&wauthor, &width, author, COLS,
2558 		    date_display_cols);
2559 		if (author_cols < width)
2560 			author_cols = width;
2561 		free(wauthor);
2562 		free(author);
2563 		if (err)
2564 			goto done;
2565 		err = got_object_commit_get_logmsg(&msg0, c);
2566 		if (err)
2567 			goto done;
2568 		msg = msg0;
2569 		while (*msg == '\n')
2570 			++msg;
2571 		if ((eol = strchr(msg, '\n')))
2572 			*eol = '\0';
2573 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2574 		    date_display_cols + author_cols, 0);
2575 		if (err)
2576 			goto done;
2577 		view->maxx = MAX(view->maxx, width);
2578 		free(msg0);
2579 		free(wmsg);
2580 		ncommits++;
2581 		entry = TAILQ_NEXT(entry, entry);
2582 	}
2583 
2584 	entry = s->first_displayed_entry;
2585 	s->last_displayed_entry = s->first_displayed_entry;
2586 	ncommits = 0;
2587 	while (entry) {
2588 		if (ncommits >= limit - 1)
2589 			break;
2590 		if (ncommits == s->selected)
2591 			wstandout(view->window);
2592 		err = draw_commit(view, entry->commit, entry->id,
2593 		    date_display_cols, author_cols);
2594 		if (ncommits == s->selected)
2595 			wstandend(view->window);
2596 		if (err)
2597 			goto done;
2598 		ncommits++;
2599 		s->last_displayed_entry = entry;
2600 		entry = TAILQ_NEXT(entry, entry);
2601 	}
2602 
2603 	view_border(view);
2604 done:
2605 	free(id_str);
2606 	free(refs_str);
2607 	free(ncommits_str);
2608 	free(header);
2609 	return err;
2610 }
2611 
2612 static void
2613 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2614 {
2615 	struct commit_queue_entry *entry;
2616 	int nscrolled = 0;
2617 
2618 	entry = TAILQ_FIRST(&s->commits->head);
2619 	if (s->first_displayed_entry == entry)
2620 		return;
2621 
2622 	entry = s->first_displayed_entry;
2623 	while (entry && nscrolled < maxscroll) {
2624 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2625 		if (entry) {
2626 			s->first_displayed_entry = entry;
2627 			nscrolled++;
2628 		}
2629 	}
2630 }
2631 
2632 static const struct got_error *
2633 trigger_log_thread(struct tog_view *view, int wait)
2634 {
2635 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2636 	int errcode;
2637 
2638 	halfdelay(1); /* fast refresh while loading commits */
2639 
2640 	while (!ta->log_complete && !tog_thread_error &&
2641 	    (ta->commits_needed > 0 || ta->load_all)) {
2642 		/* Wake the log thread. */
2643 		errcode = pthread_cond_signal(&ta->need_commits);
2644 		if (errcode)
2645 			return got_error_set_errno(errcode,
2646 			    "pthread_cond_signal");
2647 
2648 		/*
2649 		 * The mutex will be released while the view loop waits
2650 		 * in wgetch(), at which time the log thread will run.
2651 		 */
2652 		if (!wait)
2653 			break;
2654 
2655 		/* Display progress update in log view. */
2656 		show_log_view(view);
2657 		update_panels();
2658 		doupdate();
2659 
2660 		/* Wait right here while next commit is being loaded. */
2661 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2662 		if (errcode)
2663 			return got_error_set_errno(errcode,
2664 			    "pthread_cond_wait");
2665 
2666 		/* Display progress update in log view. */
2667 		show_log_view(view);
2668 		update_panels();
2669 		doupdate();
2670 	}
2671 
2672 	return NULL;
2673 }
2674 
2675 static const struct got_error *
2676 request_log_commits(struct tog_view *view)
2677 {
2678 	struct tog_log_view_state	*state = &view->state.log;
2679 	const struct got_error		*err = NULL;
2680 
2681 	if (state->thread_args.log_complete)
2682 		return NULL;
2683 
2684 	state->thread_args.commits_needed += view->nscrolled;
2685 	err = trigger_log_thread(view, 1);
2686 	view->nscrolled = 0;
2687 
2688 	return err;
2689 }
2690 
2691 static const struct got_error *
2692 log_scroll_down(struct tog_view *view, int maxscroll)
2693 {
2694 	struct tog_log_view_state *s = &view->state.log;
2695 	const struct got_error *err = NULL;
2696 	struct commit_queue_entry *pentry;
2697 	int nscrolled = 0, ncommits_needed;
2698 
2699 	if (s->last_displayed_entry == NULL)
2700 		return NULL;
2701 
2702 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2703 	if (s->commits->ncommits < ncommits_needed &&
2704 	    !s->thread_args.log_complete) {
2705 		/*
2706 		 * Ask the log thread for required amount of commits.
2707 		 */
2708 		s->thread_args.commits_needed +=
2709 		    ncommits_needed - s->commits->ncommits;
2710 		err = trigger_log_thread(view, 1);
2711 		if (err)
2712 			return err;
2713 	}
2714 
2715 	do {
2716 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2717 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2718 			break;
2719 
2720 		s->last_displayed_entry = pentry ?
2721 		    pentry : s->last_displayed_entry;;
2722 
2723 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2724 		if (pentry == NULL)
2725 			break;
2726 		s->first_displayed_entry = pentry;
2727 	} while (++nscrolled < maxscroll);
2728 
2729 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2730 		view->nscrolled += nscrolled;
2731 	else
2732 		view->nscrolled = 0;
2733 
2734 	return err;
2735 }
2736 
2737 static const struct got_error *
2738 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2739     struct got_commit_object *commit, struct got_object_id *commit_id,
2740     struct tog_view *log_view, struct got_repository *repo)
2741 {
2742 	const struct got_error *err;
2743 	struct got_object_qid *parent_id;
2744 	struct tog_view *diff_view;
2745 
2746 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2747 	if (diff_view == NULL)
2748 		return got_error_from_errno("view_open");
2749 
2750 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2751 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2752 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2753 	if (err == NULL)
2754 		*new_view = diff_view;
2755 	return err;
2756 }
2757 
2758 static const struct got_error *
2759 tree_view_visit_subtree(struct tog_tree_view_state *s,
2760     struct got_tree_object *subtree)
2761 {
2762 	struct tog_parent_tree *parent;
2763 
2764 	parent = calloc(1, sizeof(*parent));
2765 	if (parent == NULL)
2766 		return got_error_from_errno("calloc");
2767 
2768 	parent->tree = s->tree;
2769 	parent->first_displayed_entry = s->first_displayed_entry;
2770 	parent->selected_entry = s->selected_entry;
2771 	parent->selected = s->selected;
2772 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2773 	s->tree = subtree;
2774 	s->selected = 0;
2775 	s->first_displayed_entry = NULL;
2776 	return NULL;
2777 }
2778 
2779 static const struct got_error *
2780 tree_view_walk_path(struct tog_tree_view_state *s,
2781     struct got_commit_object *commit, const char *path)
2782 {
2783 	const struct got_error *err = NULL;
2784 	struct got_tree_object *tree = NULL;
2785 	const char *p;
2786 	char *slash, *subpath = NULL;
2787 
2788 	/* Walk the path and open corresponding tree objects. */
2789 	p = path;
2790 	while (*p) {
2791 		struct got_tree_entry *te;
2792 		struct got_object_id *tree_id;
2793 		char *te_name;
2794 
2795 		while (p[0] == '/')
2796 			p++;
2797 
2798 		/* Ensure the correct subtree entry is selected. */
2799 		slash = strchr(p, '/');
2800 		if (slash == NULL)
2801 			te_name = strdup(p);
2802 		else
2803 			te_name = strndup(p, slash - p);
2804 		if (te_name == NULL) {
2805 			err = got_error_from_errno("strndup");
2806 			break;
2807 		}
2808 		te = got_object_tree_find_entry(s->tree, te_name);
2809 		if (te == NULL) {
2810 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2811 			free(te_name);
2812 			break;
2813 		}
2814 		free(te_name);
2815 		s->first_displayed_entry = s->selected_entry = te;
2816 
2817 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2818 			break; /* jump to this file's entry */
2819 
2820 		slash = strchr(p, '/');
2821 		if (slash)
2822 			subpath = strndup(path, slash - path);
2823 		else
2824 			subpath = strdup(path);
2825 		if (subpath == NULL) {
2826 			err = got_error_from_errno("strdup");
2827 			break;
2828 		}
2829 
2830 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2831 		    subpath);
2832 		if (err)
2833 			break;
2834 
2835 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2836 		free(tree_id);
2837 		if (err)
2838 			break;
2839 
2840 		err = tree_view_visit_subtree(s, tree);
2841 		if (err) {
2842 			got_object_tree_close(tree);
2843 			break;
2844 		}
2845 		if (slash == NULL)
2846 			break;
2847 		free(subpath);
2848 		subpath = NULL;
2849 		p = slash;
2850 	}
2851 
2852 	free(subpath);
2853 	return err;
2854 }
2855 
2856 static const struct got_error *
2857 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2858     struct commit_queue_entry *entry, const char *path,
2859     const char *head_ref_name, struct got_repository *repo)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_tree_view_state *s;
2863 	struct tog_view *tree_view;
2864 
2865 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2866 	if (tree_view == NULL)
2867 		return got_error_from_errno("view_open");
2868 
2869 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2870 	if (err)
2871 		return err;
2872 	s = &tree_view->state.tree;
2873 
2874 	*new_view = tree_view;
2875 
2876 	if (got_path_is_root_dir(path))
2877 		return NULL;
2878 
2879 	return tree_view_walk_path(s, entry->commit, path);
2880 }
2881 
2882 static const struct got_error *
2883 block_signals_used_by_main_thread(void)
2884 {
2885 	sigset_t sigset;
2886 	int errcode;
2887 
2888 	if (sigemptyset(&sigset) == -1)
2889 		return got_error_from_errno("sigemptyset");
2890 
2891 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2892 	if (sigaddset(&sigset, SIGWINCH) == -1)
2893 		return got_error_from_errno("sigaddset");
2894 	if (sigaddset(&sigset, SIGCONT) == -1)
2895 		return got_error_from_errno("sigaddset");
2896 	if (sigaddset(&sigset, SIGINT) == -1)
2897 		return got_error_from_errno("sigaddset");
2898 	if (sigaddset(&sigset, SIGTERM) == -1)
2899 		return got_error_from_errno("sigaddset");
2900 
2901 	/* ncurses handles SIGTSTP */
2902 	if (sigaddset(&sigset, SIGTSTP) == -1)
2903 		return got_error_from_errno("sigaddset");
2904 
2905 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2906 	if (errcode)
2907 		return got_error_set_errno(errcode, "pthread_sigmask");
2908 
2909 	return NULL;
2910 }
2911 
2912 static void *
2913 log_thread(void *arg)
2914 {
2915 	const struct got_error *err = NULL;
2916 	int errcode = 0;
2917 	struct tog_log_thread_args *a = arg;
2918 	int done = 0;
2919 
2920 	/*
2921 	 * Sync startup with main thread such that we begin our
2922 	 * work once view_input() has released the mutex.
2923 	 */
2924 	errcode = pthread_mutex_lock(&tog_mutex);
2925 	if (errcode) {
2926 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2927 		return (void *)err;
2928 	}
2929 
2930 	err = block_signals_used_by_main_thread();
2931 	if (err) {
2932 		pthread_mutex_unlock(&tog_mutex);
2933 		goto done;
2934 	}
2935 
2936 	while (!done && !err && !tog_fatal_signal_received()) {
2937 		errcode = pthread_mutex_unlock(&tog_mutex);
2938 		if (errcode) {
2939 			err = got_error_set_errno(errcode,
2940 			    "pthread_mutex_unlock");
2941 			goto done;
2942 		}
2943 		err = queue_commits(a);
2944 		if (err) {
2945 			if (err->code != GOT_ERR_ITER_COMPLETED)
2946 				goto done;
2947 			err = NULL;
2948 			done = 1;
2949 		} else if (a->commits_needed > 0 && !a->load_all) {
2950 			if (*a->limiting) {
2951 				if (a->limit_match)
2952 					a->commits_needed--;
2953 			} else
2954 				a->commits_needed--;
2955 		}
2956 
2957 		errcode = pthread_mutex_lock(&tog_mutex);
2958 		if (errcode) {
2959 			err = got_error_set_errno(errcode,
2960 			    "pthread_mutex_lock");
2961 			goto done;
2962 		} else if (*a->quit)
2963 			done = 1;
2964 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2965 			*a->first_displayed_entry =
2966 			    TAILQ_FIRST(&a->limit_commits->head);
2967 			*a->selected_entry = *a->first_displayed_entry;
2968 		} else if (*a->first_displayed_entry == NULL) {
2969 			*a->first_displayed_entry =
2970 			    TAILQ_FIRST(&a->real_commits->head);
2971 			*a->selected_entry = *a->first_displayed_entry;
2972 		}
2973 
2974 		errcode = pthread_cond_signal(&a->commit_loaded);
2975 		if (errcode) {
2976 			err = got_error_set_errno(errcode,
2977 			    "pthread_cond_signal");
2978 			pthread_mutex_unlock(&tog_mutex);
2979 			goto done;
2980 		}
2981 
2982 		if (done)
2983 			a->commits_needed = 0;
2984 		else {
2985 			if (a->commits_needed == 0 && !a->load_all) {
2986 				errcode = pthread_cond_wait(&a->need_commits,
2987 				    &tog_mutex);
2988 				if (errcode) {
2989 					err = got_error_set_errno(errcode,
2990 					    "pthread_cond_wait");
2991 					pthread_mutex_unlock(&tog_mutex);
2992 					goto done;
2993 				}
2994 				if (*a->quit)
2995 					done = 1;
2996 			}
2997 		}
2998 	}
2999 	a->log_complete = 1;
3000 	errcode = pthread_mutex_unlock(&tog_mutex);
3001 	if (errcode)
3002 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3003 done:
3004 	if (err) {
3005 		tog_thread_error = 1;
3006 		pthread_cond_signal(&a->commit_loaded);
3007 	}
3008 	return (void *)err;
3009 }
3010 
3011 static const struct got_error *
3012 stop_log_thread(struct tog_log_view_state *s)
3013 {
3014 	const struct got_error *err = NULL, *thread_err = NULL;
3015 	int errcode;
3016 
3017 	if (s->thread) {
3018 		s->quit = 1;
3019 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3020 		if (errcode)
3021 			return got_error_set_errno(errcode,
3022 			    "pthread_cond_signal");
3023 		errcode = pthread_mutex_unlock(&tog_mutex);
3024 		if (errcode)
3025 			return got_error_set_errno(errcode,
3026 			    "pthread_mutex_unlock");
3027 		errcode = pthread_join(s->thread, (void **)&thread_err);
3028 		if (errcode)
3029 			return got_error_set_errno(errcode, "pthread_join");
3030 		errcode = pthread_mutex_lock(&tog_mutex);
3031 		if (errcode)
3032 			return got_error_set_errno(errcode,
3033 			    "pthread_mutex_lock");
3034 		s->thread = NULL;
3035 	}
3036 
3037 	if (s->thread_args.repo) {
3038 		err = got_repo_close(s->thread_args.repo);
3039 		s->thread_args.repo = NULL;
3040 	}
3041 
3042 	if (s->thread_args.pack_fds) {
3043 		const struct got_error *pack_err =
3044 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3045 		if (err == NULL)
3046 			err = pack_err;
3047 		s->thread_args.pack_fds = NULL;
3048 	}
3049 
3050 	if (s->thread_args.graph) {
3051 		got_commit_graph_close(s->thread_args.graph);
3052 		s->thread_args.graph = NULL;
3053 	}
3054 
3055 	return err ? err : thread_err;
3056 }
3057 
3058 static const struct got_error *
3059 close_log_view(struct tog_view *view)
3060 {
3061 	const struct got_error *err = NULL;
3062 	struct tog_log_view_state *s = &view->state.log;
3063 	int errcode;
3064 
3065 	err = stop_log_thread(s);
3066 
3067 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3068 	if (errcode && err == NULL)
3069 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3070 
3071 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3072 	if (errcode && err == NULL)
3073 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3074 
3075 	free_commits(&s->limit_commits);
3076 	free_commits(&s->real_commits);
3077 	free(s->in_repo_path);
3078 	s->in_repo_path = NULL;
3079 	free(s->start_id);
3080 	s->start_id = NULL;
3081 	free(s->head_ref_name);
3082 	s->head_ref_name = NULL;
3083 	return err;
3084 }
3085 
3086 /*
3087  * We use two queues to implement the limit feature: first consists of
3088  * commits matching the current limit_regex; second is the real queue
3089  * of all known commits (real_commits). When the user starts limiting,
3090  * we swap queues such that all movement and displaying functionality
3091  * works with very slight change.
3092  */
3093 static const struct got_error *
3094 limit_log_view(struct tog_view *view)
3095 {
3096 	struct tog_log_view_state *s = &view->state.log;
3097 	struct commit_queue_entry *entry;
3098 	struct tog_view	*v = view;
3099 	const struct got_error *err = NULL;
3100 	char pattern[1024];
3101 	int ret;
3102 
3103 	if (view_is_hsplit_top(view))
3104 		v = view->child;
3105 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3106 		v = view->parent;
3107 
3108 	/* Get the pattern */
3109 	wmove(v->window, v->nlines - 1, 0);
3110 	wclrtoeol(v->window);
3111 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3112 	nodelay(v->window, FALSE);
3113 	nocbreak();
3114 	echo();
3115 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3116 	cbreak();
3117 	noecho();
3118 	nodelay(v->window, TRUE);
3119 	if (ret == ERR)
3120 		return NULL;
3121 
3122 	if (*pattern == '\0') {
3123 		/*
3124 		 * Safety measure for the situation where the user
3125 		 * resets limit without previously limiting anything.
3126 		 */
3127 		if (!s->limit_view)
3128 			return NULL;
3129 
3130 		/*
3131 		 * User could have pressed Ctrl+L, which refreshed the
3132 		 * commit queues, it means we can't save previously
3133 		 * (before limit took place) displayed entries,
3134 		 * because they would point to already free'ed memory,
3135 		 * so we are forced to always select first entry of
3136 		 * the queue.
3137 		 */
3138 		s->commits = &s->real_commits;
3139 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3140 		s->selected_entry = s->first_displayed_entry;
3141 		s->selected = 0;
3142 		s->limit_view = 0;
3143 
3144 		return NULL;
3145 	}
3146 
3147 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3148 		return NULL;
3149 
3150 	s->limit_view = 1;
3151 
3152 	/* Clear the screen while loading limit view */
3153 	s->first_displayed_entry = NULL;
3154 	s->last_displayed_entry = NULL;
3155 	s->selected_entry = NULL;
3156 	s->commits = &s->limit_commits;
3157 
3158 	/* Prepare limit queue for new search */
3159 	free_commits(&s->limit_commits);
3160 	s->limit_commits.ncommits = 0;
3161 
3162 	/* First process commits, which are in queue already */
3163 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3164 		int have_match = 0;
3165 
3166 		err = match_commit(&have_match, entry->id,
3167 		    entry->commit, &s->limit_regex);
3168 		if (err)
3169 			return err;
3170 
3171 		if (have_match) {
3172 			struct commit_queue_entry *matched;
3173 
3174 			matched = alloc_commit_queue_entry(entry->commit,
3175 			    entry->id);
3176 			if (matched == NULL) {
3177 				err = got_error_from_errno(
3178 				    "alloc_commit_queue_entry");
3179 				break;
3180 			}
3181 			matched->commit = entry->commit;
3182 			got_object_commit_retain(entry->commit);
3183 
3184 			matched->idx = s->limit_commits.ncommits;
3185 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3186 			    matched, entry);
3187 			s->limit_commits.ncommits++;
3188 		}
3189 	}
3190 
3191 	/* Second process all the commits, until we fill the screen */
3192 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3193 	    !s->thread_args.log_complete) {
3194 		s->thread_args.commits_needed +=
3195 		    view->nlines - s->limit_commits.ncommits - 1;
3196 		err = trigger_log_thread(view, 1);
3197 		if (err)
3198 			return err;
3199 	}
3200 
3201 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3202 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3203 	s->selected = 0;
3204 
3205 	return NULL;
3206 }
3207 
3208 static const struct got_error *
3209 search_start_log_view(struct tog_view *view)
3210 {
3211 	struct tog_log_view_state *s = &view->state.log;
3212 
3213 	s->matched_entry = NULL;
3214 	s->search_entry = NULL;
3215 	return NULL;
3216 }
3217 
3218 static const struct got_error *
3219 search_next_log_view(struct tog_view *view)
3220 {
3221 	const struct got_error *err = NULL;
3222 	struct tog_log_view_state *s = &view->state.log;
3223 	struct commit_queue_entry *entry;
3224 
3225 	/* Display progress update in log view. */
3226 	show_log_view(view);
3227 	update_panels();
3228 	doupdate();
3229 
3230 	if (s->search_entry) {
3231 		int errcode, ch;
3232 		errcode = pthread_mutex_unlock(&tog_mutex);
3233 		if (errcode)
3234 			return got_error_set_errno(errcode,
3235 			    "pthread_mutex_unlock");
3236 		ch = wgetch(view->window);
3237 		errcode = pthread_mutex_lock(&tog_mutex);
3238 		if (errcode)
3239 			return got_error_set_errno(errcode,
3240 			    "pthread_mutex_lock");
3241 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3242 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3243 			return NULL;
3244 		}
3245 		if (view->searching == TOG_SEARCH_FORWARD)
3246 			entry = TAILQ_NEXT(s->search_entry, entry);
3247 		else
3248 			entry = TAILQ_PREV(s->search_entry,
3249 			    commit_queue_head, entry);
3250 	} else if (s->matched_entry) {
3251 		/*
3252 		 * If the user has moved the cursor after we hit a match,
3253 		 * the position from where we should continue searching
3254 		 * might have changed.
3255 		 */
3256 		if (view->searching == TOG_SEARCH_FORWARD)
3257 			entry = TAILQ_NEXT(s->selected_entry, entry);
3258 		else
3259 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3260 			    entry);
3261 	} else {
3262 		entry = s->selected_entry;
3263 	}
3264 
3265 	while (1) {
3266 		int have_match = 0;
3267 
3268 		if (entry == NULL) {
3269 			if (s->thread_args.log_complete ||
3270 			    view->searching == TOG_SEARCH_BACKWARD) {
3271 				view->search_next_done =
3272 				    (s->matched_entry == NULL ?
3273 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3274 				s->search_entry = NULL;
3275 				return NULL;
3276 			}
3277 			/*
3278 			 * Poke the log thread for more commits and return,
3279 			 * allowing the main loop to make progress. Search
3280 			 * will resume at s->search_entry once we come back.
3281 			 */
3282 			s->thread_args.commits_needed++;
3283 			return trigger_log_thread(view, 0);
3284 		}
3285 
3286 		err = match_commit(&have_match, entry->id, entry->commit,
3287 		    &view->regex);
3288 		if (err)
3289 			break;
3290 		if (have_match) {
3291 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3292 			s->matched_entry = entry;
3293 			break;
3294 		}
3295 
3296 		s->search_entry = entry;
3297 		if (view->searching == TOG_SEARCH_FORWARD)
3298 			entry = TAILQ_NEXT(entry, entry);
3299 		else
3300 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3301 	}
3302 
3303 	if (s->matched_entry) {
3304 		int cur = s->selected_entry->idx;
3305 		while (cur < s->matched_entry->idx) {
3306 			err = input_log_view(NULL, view, KEY_DOWN);
3307 			if (err)
3308 				return err;
3309 			cur++;
3310 		}
3311 		while (cur > s->matched_entry->idx) {
3312 			err = input_log_view(NULL, view, KEY_UP);
3313 			if (err)
3314 				return err;
3315 			cur--;
3316 		}
3317 	}
3318 
3319 	s->search_entry = NULL;
3320 
3321 	return NULL;
3322 }
3323 
3324 static const struct got_error *
3325 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3326     struct got_repository *repo, const char *head_ref_name,
3327     const char *in_repo_path, int log_branches)
3328 {
3329 	const struct got_error *err = NULL;
3330 	struct tog_log_view_state *s = &view->state.log;
3331 	struct got_repository *thread_repo = NULL;
3332 	struct got_commit_graph *thread_graph = NULL;
3333 	int errcode;
3334 
3335 	if (in_repo_path != s->in_repo_path) {
3336 		free(s->in_repo_path);
3337 		s->in_repo_path = strdup(in_repo_path);
3338 		if (s->in_repo_path == NULL)
3339 			return got_error_from_errno("strdup");
3340 	}
3341 
3342 	/* The commit queue only contains commits being displayed. */
3343 	TAILQ_INIT(&s->real_commits.head);
3344 	s->real_commits.ncommits = 0;
3345 	s->commits = &s->real_commits;
3346 
3347 	TAILQ_INIT(&s->limit_commits.head);
3348 	s->limit_view = 0;
3349 	s->limit_commits.ncommits = 0;
3350 
3351 	s->repo = repo;
3352 	if (head_ref_name) {
3353 		s->head_ref_name = strdup(head_ref_name);
3354 		if (s->head_ref_name == NULL) {
3355 			err = got_error_from_errno("strdup");
3356 			goto done;
3357 		}
3358 	}
3359 	s->start_id = got_object_id_dup(start_id);
3360 	if (s->start_id == NULL) {
3361 		err = got_error_from_errno("got_object_id_dup");
3362 		goto done;
3363 	}
3364 	s->log_branches = log_branches;
3365 	s->use_committer = 1;
3366 
3367 	STAILQ_INIT(&s->colors);
3368 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3369 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3370 		    get_color_value("TOG_COLOR_COMMIT"));
3371 		if (err)
3372 			goto done;
3373 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3374 		    get_color_value("TOG_COLOR_AUTHOR"));
3375 		if (err) {
3376 			free_colors(&s->colors);
3377 			goto done;
3378 		}
3379 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3380 		    get_color_value("TOG_COLOR_DATE"));
3381 		if (err) {
3382 			free_colors(&s->colors);
3383 			goto done;
3384 		}
3385 	}
3386 
3387 	view->show = show_log_view;
3388 	view->input = input_log_view;
3389 	view->resize = resize_log_view;
3390 	view->close = close_log_view;
3391 	view->search_start = search_start_log_view;
3392 	view->search_next = search_next_log_view;
3393 
3394 	if (s->thread_args.pack_fds == NULL) {
3395 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3396 		if (err)
3397 			goto done;
3398 	}
3399 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3400 	    s->thread_args.pack_fds);
3401 	if (err)
3402 		goto done;
3403 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3404 	    !s->log_branches);
3405 	if (err)
3406 		goto done;
3407 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3408 	    s->repo, NULL, NULL);
3409 	if (err)
3410 		goto done;
3411 
3412 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3413 	if (errcode) {
3414 		err = got_error_set_errno(errcode, "pthread_cond_init");
3415 		goto done;
3416 	}
3417 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3418 	if (errcode) {
3419 		err = got_error_set_errno(errcode, "pthread_cond_init");
3420 		goto done;
3421 	}
3422 
3423 	s->thread_args.commits_needed = view->nlines;
3424 	s->thread_args.graph = thread_graph;
3425 	s->thread_args.real_commits = &s->real_commits;
3426 	s->thread_args.limit_commits = &s->limit_commits;
3427 	s->thread_args.in_repo_path = s->in_repo_path;
3428 	s->thread_args.start_id = s->start_id;
3429 	s->thread_args.repo = thread_repo;
3430 	s->thread_args.log_complete = 0;
3431 	s->thread_args.quit = &s->quit;
3432 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3433 	s->thread_args.selected_entry = &s->selected_entry;
3434 	s->thread_args.searching = &view->searching;
3435 	s->thread_args.search_next_done = &view->search_next_done;
3436 	s->thread_args.regex = &view->regex;
3437 	s->thread_args.limiting = &s->limit_view;
3438 	s->thread_args.limit_regex = &s->limit_regex;
3439 	s->thread_args.limit_commits = &s->limit_commits;
3440 done:
3441 	if (err)
3442 		close_log_view(view);
3443 	return err;
3444 }
3445 
3446 static const struct got_error *
3447 show_log_view(struct tog_view *view)
3448 {
3449 	const struct got_error *err;
3450 	struct tog_log_view_state *s = &view->state.log;
3451 
3452 	if (s->thread == NULL) {
3453 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3454 		    &s->thread_args);
3455 		if (errcode)
3456 			return got_error_set_errno(errcode, "pthread_create");
3457 		if (s->thread_args.commits_needed > 0) {
3458 			err = trigger_log_thread(view, 1);
3459 			if (err)
3460 				return err;
3461 		}
3462 	}
3463 
3464 	return draw_commits(view);
3465 }
3466 
3467 static void
3468 log_move_cursor_up(struct tog_view *view, int page, int home)
3469 {
3470 	struct tog_log_view_state *s = &view->state.log;
3471 
3472 	if (s->first_displayed_entry == NULL)
3473 		return;
3474 	if (s->selected_entry->idx == 0)
3475 		view->count = 0;
3476 
3477 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3478 	    || home)
3479 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3480 
3481 	if (!page && !home && s->selected > 0)
3482 		--s->selected;
3483 	else
3484 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3485 
3486 	select_commit(s);
3487 	return;
3488 }
3489 
3490 static const struct got_error *
3491 log_move_cursor_down(struct tog_view *view, int page)
3492 {
3493 	struct tog_log_view_state	*s = &view->state.log;
3494 	const struct got_error		*err = NULL;
3495 	int				 eos = view->nlines - 2;
3496 
3497 	if (s->first_displayed_entry == NULL)
3498 		return NULL;
3499 
3500 	if (s->thread_args.log_complete &&
3501 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3502 		return NULL;
3503 
3504 	if (view_is_hsplit_top(view))
3505 		--eos;  /* border consumes the last line */
3506 
3507 	if (!page) {
3508 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3509 			++s->selected;
3510 		else
3511 			err = log_scroll_down(view, 1);
3512 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3513 		struct commit_queue_entry *entry;
3514 		int n;
3515 
3516 		s->selected = 0;
3517 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3518 		s->last_displayed_entry = entry;
3519 		for (n = 0; n <= eos; n++) {
3520 			if (entry == NULL)
3521 				break;
3522 			s->first_displayed_entry = entry;
3523 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3524 		}
3525 		if (n > 0)
3526 			s->selected = n - 1;
3527 	} else {
3528 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3529 		    s->thread_args.log_complete)
3530 			s->selected += MIN(page,
3531 			    s->commits->ncommits - s->selected_entry->idx - 1);
3532 		else
3533 			err = log_scroll_down(view, page);
3534 	}
3535 	if (err)
3536 		return err;
3537 
3538 	/*
3539 	 * We might necessarily overshoot in horizontal
3540 	 * splits; if so, select the last displayed commit.
3541 	 */
3542 	if (s->first_displayed_entry && s->last_displayed_entry) {
3543 		s->selected = MIN(s->selected,
3544 		    s->last_displayed_entry->idx -
3545 		    s->first_displayed_entry->idx);
3546 	}
3547 
3548 	select_commit(s);
3549 
3550 	if (s->thread_args.log_complete &&
3551 	    s->selected_entry->idx == s->commits->ncommits - 1)
3552 		view->count = 0;
3553 
3554 	return NULL;
3555 }
3556 
3557 static void
3558 view_get_split(struct tog_view *view, int *y, int *x)
3559 {
3560 	*x = 0;
3561 	*y = 0;
3562 
3563 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3564 		if (view->child && view->child->resized_y)
3565 			*y = view->child->resized_y;
3566 		else if (view->resized_y)
3567 			*y = view->resized_y;
3568 		else
3569 			*y = view_split_begin_y(view->lines);
3570 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3571 		if (view->child && view->child->resized_x)
3572 			*x = view->child->resized_x;
3573 		else if (view->resized_x)
3574 			*x = view->resized_x;
3575 		else
3576 			*x = view_split_begin_x(view->begin_x);
3577 	}
3578 }
3579 
3580 /* Split view horizontally at y and offset view->state->selected line. */
3581 static const struct got_error *
3582 view_init_hsplit(struct tog_view *view, int y)
3583 {
3584 	const struct got_error *err = NULL;
3585 
3586 	view->nlines = y;
3587 	view->ncols = COLS;
3588 	err = view_resize(view);
3589 	if (err)
3590 		return err;
3591 
3592 	err = offset_selection_down(view);
3593 
3594 	return err;
3595 }
3596 
3597 static const struct got_error *
3598 log_goto_line(struct tog_view *view, int nlines)
3599 {
3600 	const struct got_error		*err = NULL;
3601 	struct tog_log_view_state	*s = &view->state.log;
3602 	int				 g, idx = s->selected_entry->idx;
3603 
3604 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3605 		return NULL;
3606 
3607 	g = view->gline;
3608 	view->gline = 0;
3609 
3610 	if (g >= s->first_displayed_entry->idx + 1 &&
3611 	    g <= s->last_displayed_entry->idx + 1 &&
3612 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3613 		s->selected = g - s->first_displayed_entry->idx - 1;
3614 		select_commit(s);
3615 		return NULL;
3616 	}
3617 
3618 	if (idx + 1 < g) {
3619 		err = log_move_cursor_down(view, g - idx - 1);
3620 		if (!err && g > s->selected_entry->idx + 1)
3621 			err = log_move_cursor_down(view,
3622 			    g - s->first_displayed_entry->idx - 1);
3623 		if (err)
3624 			return err;
3625 	} else if (idx + 1 > g)
3626 		log_move_cursor_up(view, idx - g + 1, 0);
3627 
3628 	if (g < nlines && s->first_displayed_entry->idx == 0)
3629 		s->selected = g - 1;
3630 
3631 	select_commit(s);
3632 	return NULL;
3633 
3634 }
3635 
3636 static const struct got_error *
3637 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3638 {
3639 	const struct got_error *err = NULL;
3640 	struct tog_log_view_state *s = &view->state.log;
3641 	int eos, nscroll;
3642 
3643 	if (s->thread_args.load_all) {
3644 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3645 			s->thread_args.load_all = 0;
3646 		else if (s->thread_args.log_complete) {
3647 			err = log_move_cursor_down(view, s->commits->ncommits);
3648 			s->thread_args.load_all = 0;
3649 		}
3650 		if (err)
3651 			return err;
3652 	}
3653 
3654 	eos = nscroll = view->nlines - 1;
3655 	if (view_is_hsplit_top(view))
3656 		--eos;  /* border */
3657 
3658 	if (view->gline)
3659 		return log_goto_line(view, eos);
3660 
3661 	switch (ch) {
3662 	case '&':
3663 		err = limit_log_view(view);
3664 		break;
3665 	case 'q':
3666 		s->quit = 1;
3667 		break;
3668 	case '0':
3669 		view->x = 0;
3670 		break;
3671 	case '$':
3672 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3673 		view->count = 0;
3674 		break;
3675 	case KEY_RIGHT:
3676 	case 'l':
3677 		if (view->x + view->ncols / 2 < view->maxx)
3678 			view->x += 2;  /* move two columns right */
3679 		else
3680 			view->count = 0;
3681 		break;
3682 	case KEY_LEFT:
3683 	case 'h':
3684 		view->x -= MIN(view->x, 2);  /* move two columns back */
3685 		if (view->x <= 0)
3686 			view->count = 0;
3687 		break;
3688 	case 'k':
3689 	case KEY_UP:
3690 	case '<':
3691 	case ',':
3692 	case CTRL('p'):
3693 		log_move_cursor_up(view, 0, 0);
3694 		break;
3695 	case 'g':
3696 	case KEY_HOME:
3697 		log_move_cursor_up(view, 0, 1);
3698 		view->count = 0;
3699 		break;
3700 	case CTRL('u'):
3701 	case 'u':
3702 		nscroll /= 2;
3703 		/* FALL THROUGH */
3704 	case KEY_PPAGE:
3705 	case CTRL('b'):
3706 	case 'b':
3707 		log_move_cursor_up(view, nscroll, 0);
3708 		break;
3709 	case 'j':
3710 	case KEY_DOWN:
3711 	case '>':
3712 	case '.':
3713 	case CTRL('n'):
3714 		err = log_move_cursor_down(view, 0);
3715 		break;
3716 	case '@':
3717 		s->use_committer = !s->use_committer;
3718 		break;
3719 	case 'G':
3720 	case KEY_END: {
3721 		/* We don't know yet how many commits, so we're forced to
3722 		 * traverse them all. */
3723 		view->count = 0;
3724 		s->thread_args.load_all = 1;
3725 		if (!s->thread_args.log_complete)
3726 			return trigger_log_thread(view, 0);
3727 		err = log_move_cursor_down(view, s->commits->ncommits);
3728 		s->thread_args.load_all = 0;
3729 		break;
3730 	}
3731 	case CTRL('d'):
3732 	case 'd':
3733 		nscroll /= 2;
3734 		/* FALL THROUGH */
3735 	case KEY_NPAGE:
3736 	case CTRL('f'):
3737 	case 'f':
3738 	case ' ':
3739 		err = log_move_cursor_down(view, nscroll);
3740 		break;
3741 	case KEY_RESIZE:
3742 		if (s->selected > view->nlines - 2)
3743 			s->selected = view->nlines - 2;
3744 		if (s->selected > s->commits->ncommits - 1)
3745 			s->selected = s->commits->ncommits - 1;
3746 		select_commit(s);
3747 		if (s->commits->ncommits < view->nlines - 1 &&
3748 		    !s->thread_args.log_complete) {
3749 			s->thread_args.commits_needed += (view->nlines - 1) -
3750 			    s->commits->ncommits;
3751 			err = trigger_log_thread(view, 1);
3752 		}
3753 		break;
3754 	case KEY_ENTER:
3755 	case '\r':
3756 		view->count = 0;
3757 		if (s->selected_entry == NULL)
3758 			break;
3759 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3760 		break;
3761 	case 'T':
3762 		view->count = 0;
3763 		if (s->selected_entry == NULL)
3764 			break;
3765 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3766 		break;
3767 	case KEY_BACKSPACE:
3768 	case CTRL('l'):
3769 	case 'B':
3770 		view->count = 0;
3771 		if (ch == KEY_BACKSPACE &&
3772 		    got_path_is_root_dir(s->in_repo_path))
3773 			break;
3774 		err = stop_log_thread(s);
3775 		if (err)
3776 			return err;
3777 		if (ch == KEY_BACKSPACE) {
3778 			char *parent_path;
3779 			err = got_path_dirname(&parent_path, s->in_repo_path);
3780 			if (err)
3781 				return err;
3782 			free(s->in_repo_path);
3783 			s->in_repo_path = parent_path;
3784 			s->thread_args.in_repo_path = s->in_repo_path;
3785 		} else if (ch == CTRL('l')) {
3786 			struct got_object_id *start_id;
3787 			err = got_repo_match_object_id(&start_id, NULL,
3788 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3789 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3790 			if (err) {
3791 				if (s->head_ref_name == NULL ||
3792 				    err->code != GOT_ERR_NOT_REF)
3793 					return err;
3794 				/* Try to cope with deleted references. */
3795 				free(s->head_ref_name);
3796 				s->head_ref_name = NULL;
3797 				err = got_repo_match_object_id(&start_id,
3798 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
3799 				    &tog_refs, s->repo);
3800 				if (err)
3801 					return err;
3802 			}
3803 			free(s->start_id);
3804 			s->start_id = start_id;
3805 			s->thread_args.start_id = s->start_id;
3806 		} else /* 'B' */
3807 			s->log_branches = !s->log_branches;
3808 
3809 		if (s->thread_args.pack_fds == NULL) {
3810 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3811 			if (err)
3812 				return err;
3813 		}
3814 		err = got_repo_open(&s->thread_args.repo,
3815 		    got_repo_get_path(s->repo), NULL,
3816 		    s->thread_args.pack_fds);
3817 		if (err)
3818 			return err;
3819 		tog_free_refs();
3820 		err = tog_load_refs(s->repo, 0);
3821 		if (err)
3822 			return err;
3823 		err = got_commit_graph_open(&s->thread_args.graph,
3824 		    s->in_repo_path, !s->log_branches);
3825 		if (err)
3826 			return err;
3827 		err = got_commit_graph_iter_start(s->thread_args.graph,
3828 		    s->start_id, s->repo, NULL, NULL);
3829 		if (err)
3830 			return err;
3831 		free_commits(&s->real_commits);
3832 		free_commits(&s->limit_commits);
3833 		s->first_displayed_entry = NULL;
3834 		s->last_displayed_entry = NULL;
3835 		s->selected_entry = NULL;
3836 		s->selected = 0;
3837 		s->thread_args.log_complete = 0;
3838 		s->quit = 0;
3839 		s->thread_args.commits_needed = view->lines;
3840 		s->matched_entry = NULL;
3841 		s->search_entry = NULL;
3842 		view->offset = 0;
3843 		break;
3844 	case 'R':
3845 		view->count = 0;
3846 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3847 		break;
3848 	default:
3849 		view->count = 0;
3850 		break;
3851 	}
3852 
3853 	return err;
3854 }
3855 
3856 static const struct got_error *
3857 apply_unveil(const char *repo_path, const char *worktree_path)
3858 {
3859 	const struct got_error *error;
3860 
3861 #ifdef PROFILE
3862 	if (unveil("gmon.out", "rwc") != 0)
3863 		return got_error_from_errno2("unveil", "gmon.out");
3864 #endif
3865 	if (repo_path && unveil(repo_path, "r") != 0)
3866 		return got_error_from_errno2("unveil", repo_path);
3867 
3868 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3869 		return got_error_from_errno2("unveil", worktree_path);
3870 
3871 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3872 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3873 
3874 	error = got_privsep_unveil_exec_helpers();
3875 	if (error != NULL)
3876 		return error;
3877 
3878 	if (unveil(NULL, NULL) != 0)
3879 		return got_error_from_errno("unveil");
3880 
3881 	return NULL;
3882 }
3883 
3884 static void
3885 init_curses(void)
3886 {
3887 	/*
3888 	 * Override default signal handlers before starting ncurses.
3889 	 * This should prevent ncurses from installing its own
3890 	 * broken cleanup() signal handler.
3891 	 */
3892 	signal(SIGWINCH, tog_sigwinch);
3893 	signal(SIGPIPE, tog_sigpipe);
3894 	signal(SIGCONT, tog_sigcont);
3895 	signal(SIGINT, tog_sigint);
3896 	signal(SIGTERM, tog_sigterm);
3897 
3898 	initscr();
3899 	cbreak();
3900 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3901 	noecho();
3902 	nonl();
3903 	intrflush(stdscr, FALSE);
3904 	keypad(stdscr, TRUE);
3905 	curs_set(0);
3906 	if (getenv("TOG_COLORS") != NULL) {
3907 		start_color();
3908 		use_default_colors();
3909 	}
3910 }
3911 
3912 static const struct got_error *
3913 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3914     struct got_repository *repo, struct got_worktree *worktree)
3915 {
3916 	const struct got_error *err = NULL;
3917 
3918 	if (argc == 0) {
3919 		*in_repo_path = strdup("/");
3920 		if (*in_repo_path == NULL)
3921 			return got_error_from_errno("strdup");
3922 		return NULL;
3923 	}
3924 
3925 	if (worktree) {
3926 		const char *prefix = got_worktree_get_path_prefix(worktree);
3927 		char *p;
3928 
3929 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3930 		if (err)
3931 			return err;
3932 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3933 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3934 		    p) == -1) {
3935 			err = got_error_from_errno("asprintf");
3936 			*in_repo_path = NULL;
3937 		}
3938 		free(p);
3939 	} else
3940 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3941 
3942 	return err;
3943 }
3944 
3945 static const struct got_error *
3946 cmd_log(int argc, char *argv[])
3947 {
3948 	const struct got_error *error;
3949 	struct got_repository *repo = NULL;
3950 	struct got_worktree *worktree = NULL;
3951 	struct got_object_id *start_id = NULL;
3952 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3953 	char *start_commit = NULL, *label = NULL;
3954 	struct got_reference *ref = NULL;
3955 	const char *head_ref_name = NULL;
3956 	int ch, log_branches = 0;
3957 	struct tog_view *view;
3958 	int *pack_fds = NULL;
3959 
3960 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3961 		switch (ch) {
3962 		case 'b':
3963 			log_branches = 1;
3964 			break;
3965 		case 'c':
3966 			start_commit = optarg;
3967 			break;
3968 		case 'r':
3969 			repo_path = realpath(optarg, NULL);
3970 			if (repo_path == NULL)
3971 				return got_error_from_errno2("realpath",
3972 				    optarg);
3973 			break;
3974 		default:
3975 			usage_log();
3976 			/* NOTREACHED */
3977 		}
3978 	}
3979 
3980 	argc -= optind;
3981 	argv += optind;
3982 
3983 	if (argc > 1)
3984 		usage_log();
3985 
3986 	error = got_repo_pack_fds_open(&pack_fds);
3987 	if (error != NULL)
3988 		goto done;
3989 
3990 	if (repo_path == NULL) {
3991 		cwd = getcwd(NULL, 0);
3992 		if (cwd == NULL)
3993 			return got_error_from_errno("getcwd");
3994 		error = got_worktree_open(&worktree, cwd);
3995 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3996 			goto done;
3997 		if (worktree)
3998 			repo_path =
3999 			    strdup(got_worktree_get_repo_path(worktree));
4000 		else
4001 			repo_path = strdup(cwd);
4002 		if (repo_path == NULL) {
4003 			error = got_error_from_errno("strdup");
4004 			goto done;
4005 		}
4006 	}
4007 
4008 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4009 	if (error != NULL)
4010 		goto done;
4011 
4012 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4013 	    repo, worktree);
4014 	if (error)
4015 		goto done;
4016 
4017 	init_curses();
4018 
4019 	error = apply_unveil(got_repo_get_path(repo),
4020 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4021 	if (error)
4022 		goto done;
4023 
4024 	/* already loaded by tog_log_with_path()? */
4025 	if (TAILQ_EMPTY(&tog_refs)) {
4026 		error = tog_load_refs(repo, 0);
4027 		if (error)
4028 			goto done;
4029 	}
4030 
4031 	if (start_commit == NULL) {
4032 		error = got_repo_match_object_id(&start_id, &label,
4033 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4034 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4035 		if (error)
4036 			goto done;
4037 		head_ref_name = label;
4038 	} else {
4039 		error = got_ref_open(&ref, repo, start_commit, 0);
4040 		if (error == NULL)
4041 			head_ref_name = got_ref_get_name(ref);
4042 		else if (error->code != GOT_ERR_NOT_REF)
4043 			goto done;
4044 		error = got_repo_match_object_id(&start_id, NULL,
4045 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4046 		if (error)
4047 			goto done;
4048 	}
4049 
4050 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4051 	if (view == NULL) {
4052 		error = got_error_from_errno("view_open");
4053 		goto done;
4054 	}
4055 	error = open_log_view(view, start_id, repo, head_ref_name,
4056 	    in_repo_path, log_branches);
4057 	if (error)
4058 		goto done;
4059 	if (worktree) {
4060 		/* Release work tree lock. */
4061 		got_worktree_close(worktree);
4062 		worktree = NULL;
4063 	}
4064 	error = view_loop(view);
4065 done:
4066 	free(in_repo_path);
4067 	free(repo_path);
4068 	free(cwd);
4069 	free(start_id);
4070 	free(label);
4071 	if (ref)
4072 		got_ref_close(ref);
4073 	if (repo) {
4074 		const struct got_error *close_err = got_repo_close(repo);
4075 		if (error == NULL)
4076 			error = close_err;
4077 	}
4078 	if (worktree)
4079 		got_worktree_close(worktree);
4080 	if (pack_fds) {
4081 		const struct got_error *pack_err =
4082 		    got_repo_pack_fds_close(pack_fds);
4083 		if (error == NULL)
4084 			error = pack_err;
4085 	}
4086 	tog_free_refs();
4087 	return error;
4088 }
4089 
4090 __dead static void
4091 usage_diff(void)
4092 {
4093 	endwin();
4094 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4095 	    "object1 object2\n", getprogname());
4096 	exit(1);
4097 }
4098 
4099 static int
4100 match_line(const char *line, regex_t *regex, size_t nmatch,
4101     regmatch_t *regmatch)
4102 {
4103 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4104 }
4105 
4106 static struct tog_color *
4107 match_color(struct tog_colors *colors, const char *line)
4108 {
4109 	struct tog_color *tc = NULL;
4110 
4111 	STAILQ_FOREACH(tc, colors, entry) {
4112 		if (match_line(line, &tc->regex, 0, NULL))
4113 			return tc;
4114 	}
4115 
4116 	return NULL;
4117 }
4118 
4119 static const struct got_error *
4120 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4121     WINDOW *window, int skipcol, regmatch_t *regmatch)
4122 {
4123 	const struct got_error *err = NULL;
4124 	char *exstr = NULL;
4125 	wchar_t *wline = NULL;
4126 	int rme, rms, n, width, scrollx;
4127 	int width0 = 0, width1 = 0, width2 = 0;
4128 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4129 
4130 	*wtotal = 0;
4131 
4132 	rms = regmatch->rm_so;
4133 	rme = regmatch->rm_eo;
4134 
4135 	err = expand_tab(&exstr, line);
4136 	if (err)
4137 		return err;
4138 
4139 	/* Split the line into 3 segments, according to match offsets. */
4140 	seg0 = strndup(exstr, rms);
4141 	if (seg0 == NULL) {
4142 		err = got_error_from_errno("strndup");
4143 		goto done;
4144 	}
4145 	seg1 = strndup(exstr + rms, rme - rms);
4146 	if (seg1 == NULL) {
4147 		err = got_error_from_errno("strndup");
4148 		goto done;
4149 	}
4150 	seg2 = strdup(exstr + rme);
4151 	if (seg2 == NULL) {
4152 		err = got_error_from_errno("strndup");
4153 		goto done;
4154 	}
4155 
4156 	/* draw up to matched token if we haven't scrolled past it */
4157 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4158 	    col_tab_align, 1);
4159 	if (err)
4160 		goto done;
4161 	n = MAX(width0 - skipcol, 0);
4162 	if (n) {
4163 		free(wline);
4164 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4165 		    wlimit, col_tab_align, 1);
4166 		if (err)
4167 			goto done;
4168 		waddwstr(window, &wline[scrollx]);
4169 		wlimit -= width;
4170 		*wtotal += width;
4171 	}
4172 
4173 	if (wlimit > 0) {
4174 		int i = 0, w = 0;
4175 		size_t wlen;
4176 
4177 		free(wline);
4178 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4179 		    col_tab_align, 1);
4180 		if (err)
4181 			goto done;
4182 		wlen = wcslen(wline);
4183 		while (i < wlen) {
4184 			width = wcwidth(wline[i]);
4185 			if (width == -1) {
4186 				/* should not happen, tabs are expanded */
4187 				err = got_error(GOT_ERR_RANGE);
4188 				goto done;
4189 			}
4190 			if (width0 + w + width > skipcol)
4191 				break;
4192 			w += width;
4193 			i++;
4194 		}
4195 		/* draw (visible part of) matched token (if scrolled into it) */
4196 		if (width1 - w > 0) {
4197 			wattron(window, A_STANDOUT);
4198 			waddwstr(window, &wline[i]);
4199 			wattroff(window, A_STANDOUT);
4200 			wlimit -= (width1 - w);
4201 			*wtotal += (width1 - w);
4202 		}
4203 	}
4204 
4205 	if (wlimit > 0) {  /* draw rest of line */
4206 		free(wline);
4207 		if (skipcol > width0 + width1) {
4208 			err = format_line(&wline, &width2, &scrollx, seg2,
4209 			    skipcol - (width0 + width1), wlimit,
4210 			    col_tab_align, 1);
4211 			if (err)
4212 				goto done;
4213 			waddwstr(window, &wline[scrollx]);
4214 		} else {
4215 			err = format_line(&wline, &width2, NULL, seg2, 0,
4216 			    wlimit, col_tab_align, 1);
4217 			if (err)
4218 				goto done;
4219 			waddwstr(window, wline);
4220 		}
4221 		*wtotal += width2;
4222 	}
4223 done:
4224 	free(wline);
4225 	free(exstr);
4226 	free(seg0);
4227 	free(seg1);
4228 	free(seg2);
4229 	return err;
4230 }
4231 
4232 static int
4233 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4234 {
4235 	FILE	*f = NULL;
4236 	int	*eof, *first, *selected;
4237 
4238 	if (view->type == TOG_VIEW_DIFF) {
4239 		struct tog_diff_view_state *s = &view->state.diff;
4240 
4241 		first = &s->first_displayed_line;
4242 		selected = first;
4243 		eof = &s->eof;
4244 		f = s->f;
4245 	} else if (view->type == TOG_VIEW_HELP) {
4246 		struct tog_help_view_state *s = &view->state.help;
4247 
4248 		first = &s->first_displayed_line;
4249 		selected = first;
4250 		eof = &s->eof;
4251 		f = s->f;
4252 	} else if (view->type == TOG_VIEW_BLAME) {
4253 		struct tog_blame_view_state *s = &view->state.blame;
4254 
4255 		first = &s->first_displayed_line;
4256 		selected = &s->selected_line;
4257 		eof = &s->eof;
4258 		f = s->blame.f;
4259 	} else
4260 		return 0;
4261 
4262 	/* Center gline in the middle of the page like vi(1). */
4263 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4264 		return 0;
4265 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4266 		rewind(f);
4267 		*eof = 0;
4268 		*first = 1;
4269 		*lineno = 0;
4270 		*nprinted = 0;
4271 		return 0;
4272 	}
4273 
4274 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4275 		view->gline : (view->nlines - 3) / 2 + 1;
4276 	view->gline = 0;
4277 
4278 	return 1;
4279 }
4280 
4281 static const struct got_error *
4282 draw_file(struct tog_view *view, const char *header)
4283 {
4284 	struct tog_diff_view_state *s = &view->state.diff;
4285 	regmatch_t *regmatch = &view->regmatch;
4286 	const struct got_error *err;
4287 	int nprinted = 0;
4288 	char *line;
4289 	size_t linesize = 0;
4290 	ssize_t linelen;
4291 	wchar_t *wline;
4292 	int width;
4293 	int max_lines = view->nlines;
4294 	int nlines = s->nlines;
4295 	off_t line_offset;
4296 
4297 	s->lineno = s->first_displayed_line - 1;
4298 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4299 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4300 		return got_error_from_errno("fseek");
4301 
4302 	werase(view->window);
4303 
4304 	if (view->gline > s->nlines - 1)
4305 		view->gline = s->nlines - 1;
4306 
4307 	if (header) {
4308 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4309 		    1 : view->gline - (view->nlines - 3) / 2 :
4310 		    s->lineno + s->selected_line;
4311 
4312 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4313 			return got_error_from_errno("asprintf");
4314 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4315 		    0, 0);
4316 		free(line);
4317 		if (err)
4318 			return err;
4319 
4320 		if (view_needs_focus_indication(view))
4321 			wstandout(view->window);
4322 		waddwstr(view->window, wline);
4323 		free(wline);
4324 		wline = NULL;
4325 		while (width++ < view->ncols)
4326 			waddch(view->window, ' ');
4327 		if (view_needs_focus_indication(view))
4328 			wstandend(view->window);
4329 
4330 		if (max_lines <= 1)
4331 			return NULL;
4332 		max_lines--;
4333 	}
4334 
4335 	s->eof = 0;
4336 	view->maxx = 0;
4337 	line = NULL;
4338 	while (max_lines > 0 && nprinted < max_lines) {
4339 		enum got_diff_line_type linetype;
4340 		attr_t attr = 0;
4341 
4342 		linelen = getline(&line, &linesize, s->f);
4343 		if (linelen == -1) {
4344 			if (feof(s->f)) {
4345 				s->eof = 1;
4346 				break;
4347 			}
4348 			free(line);
4349 			return got_ferror(s->f, GOT_ERR_IO);
4350 		}
4351 
4352 		if (++s->lineno < s->first_displayed_line)
4353 			continue;
4354 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4355 			continue;
4356 		if (s->lineno == view->hiline)
4357 			attr = A_STANDOUT;
4358 
4359 		/* Set view->maxx based on full line length. */
4360 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4361 		    view->x ? 1 : 0);
4362 		if (err) {
4363 			free(line);
4364 			return err;
4365 		}
4366 		view->maxx = MAX(view->maxx, width);
4367 		free(wline);
4368 		wline = NULL;
4369 
4370 		linetype = s->lines[s->lineno].type;
4371 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4372 		    linetype < GOT_DIFF_LINE_CONTEXT)
4373 			attr |= COLOR_PAIR(linetype);
4374 		if (attr)
4375 			wattron(view->window, attr);
4376 		if (s->first_displayed_line + nprinted == s->matched_line &&
4377 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4378 			err = add_matched_line(&width, line, view->ncols, 0,
4379 			    view->window, view->x, regmatch);
4380 			if (err) {
4381 				free(line);
4382 				return err;
4383 			}
4384 		} else {
4385 			int skip;
4386 			err = format_line(&wline, &width, &skip, line,
4387 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4388 			if (err) {
4389 				free(line);
4390 				return err;
4391 			}
4392 			waddwstr(view->window, &wline[skip]);
4393 			free(wline);
4394 			wline = NULL;
4395 		}
4396 		if (s->lineno == view->hiline) {
4397 			/* highlight full gline length */
4398 			while (width++ < view->ncols)
4399 				waddch(view->window, ' ');
4400 		} else {
4401 			if (width <= view->ncols - 1)
4402 				waddch(view->window, '\n');
4403 		}
4404 		if (attr)
4405 			wattroff(view->window, attr);
4406 		if (++nprinted == 1)
4407 			s->first_displayed_line = s->lineno;
4408 	}
4409 	free(line);
4410 	if (nprinted >= 1)
4411 		s->last_displayed_line = s->first_displayed_line +
4412 		    (nprinted - 1);
4413 	else
4414 		s->last_displayed_line = s->first_displayed_line;
4415 
4416 	view_border(view);
4417 
4418 	if (s->eof) {
4419 		while (nprinted < view->nlines) {
4420 			waddch(view->window, '\n');
4421 			nprinted++;
4422 		}
4423 
4424 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4425 		    view->ncols, 0, 0);
4426 		if (err) {
4427 			return err;
4428 		}
4429 
4430 		wstandout(view->window);
4431 		waddwstr(view->window, wline);
4432 		free(wline);
4433 		wline = NULL;
4434 		wstandend(view->window);
4435 	}
4436 
4437 	return NULL;
4438 }
4439 
4440 static char *
4441 get_datestr(time_t *time, char *datebuf)
4442 {
4443 	struct tm mytm, *tm;
4444 	char *p, *s;
4445 
4446 	tm = gmtime_r(time, &mytm);
4447 	if (tm == NULL)
4448 		return NULL;
4449 	s = asctime_r(tm, datebuf);
4450 	if (s == NULL)
4451 		return NULL;
4452 	p = strchr(s, '\n');
4453 	if (p)
4454 		*p = '\0';
4455 	return s;
4456 }
4457 
4458 static const struct got_error *
4459 get_changed_paths(struct got_pathlist_head *paths,
4460     struct got_commit_object *commit, struct got_repository *repo,
4461     struct got_diffstat_cb_arg *dsa)
4462 {
4463 	const struct got_error *err = NULL;
4464 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4465 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4466 	struct got_object_qid *qid;
4467 	FILE *f1 = NULL, *f2 = NULL;
4468 	int fd1 = -1, fd2 = -1;
4469 
4470 	f1 = got_opentemp();
4471 	if (f1 == NULL) {
4472 		err = got_error_from_errno("got_opentemp");
4473 		goto done;
4474 	}
4475 	f2 = got_opentemp();
4476 	if (f2 == NULL) {
4477 		err = got_error_from_errno("got_opentemp");
4478 		goto done;
4479 	}
4480 
4481 	fd1 = got_opentempfd();
4482 	if (fd1 == -1) {
4483 		err = got_error_from_errno("got_opentempfd");
4484 		goto done;
4485 	}
4486 	fd2 = got_opentempfd();
4487 	if (fd2 == -1) {
4488 		err = got_error_from_errno("got_opentempfd");
4489 		goto done;
4490 	}
4491 
4492 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4493 	if (qid != NULL) {
4494 		struct got_commit_object *pcommit;
4495 		err = got_object_open_as_commit(&pcommit, repo,
4496 		    &qid->id);
4497 		if (err)
4498 			return err;
4499 
4500 		tree_id1 = got_object_id_dup(
4501 		    got_object_commit_get_tree_id(pcommit));
4502 		if (tree_id1 == NULL) {
4503 			got_object_commit_close(pcommit);
4504 			return got_error_from_errno("got_object_id_dup");
4505 		}
4506 		got_object_commit_close(pcommit);
4507 
4508 	}
4509 
4510 	if (tree_id1) {
4511 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4512 		if (err)
4513 			goto done;
4514 	}
4515 
4516 	tree_id2 = got_object_commit_get_tree_id(commit);
4517 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4518 	if (err)
4519 		goto done;
4520 
4521 	err = got_diff_tree(tree1, tree2, f1, f2, fd1, fd2, "", "", repo,
4522 	    got_diff_tree_compute_diffstat, dsa, 1);
4523 done:
4524 	if (tree1)
4525 		got_object_tree_close(tree1);
4526 	if (tree2)
4527 		got_object_tree_close(tree2);
4528 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
4529 		err = got_error_from_errno("close");
4530 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
4531 		err = got_error_from_errno("close");
4532 	if (f1 && fclose(f1) == EOF && err == NULL)
4533 		err = got_error_from_errno("fclose");
4534 	if (f2 && fclose(f2) == EOF && err == NULL)
4535 		err = got_error_from_errno("fclose");
4536 	free(tree_id1);
4537 	return err;
4538 }
4539 
4540 static const struct got_error *
4541 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4542     off_t off, uint8_t type)
4543 {
4544 	struct got_diff_line *p;
4545 
4546 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4547 	if (p == NULL)
4548 		return got_error_from_errno("reallocarray");
4549 	*lines = p;
4550 	(*lines)[*nlines].offset = off;
4551 	(*lines)[*nlines].type = type;
4552 	(*nlines)++;
4553 
4554 	return NULL;
4555 }
4556 
4557 static const struct got_error *
4558 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4559     struct got_object_id *commit_id, struct got_reflist_head *refs,
4560     struct got_repository *repo, int ignore_ws, int force_text_diff,
4561     FILE *outfile)
4562 {
4563 	const struct got_error *err = NULL;
4564 	char datebuf[26], *datestr;
4565 	struct got_commit_object *commit;
4566 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4567 	time_t committer_time;
4568 	const char *author, *committer;
4569 	char *refs_str = NULL;
4570 	struct got_pathlist_head changed_paths;
4571 	struct got_pathlist_entry *pe;
4572 	struct got_diffstat_cb_arg dsa = { 0, 0, 0, 0, 0, 0, &changed_paths,
4573 	    ignore_ws, force_text_diff, tog_diff_algo };
4574 	off_t outoff = 0;
4575 	int n;
4576 
4577 	TAILQ_INIT(&changed_paths);
4578 
4579 	if (refs) {
4580 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4581 		if (err)
4582 			return err;
4583 	}
4584 
4585 	err = got_object_open_as_commit(&commit, repo, commit_id);
4586 	if (err)
4587 		return err;
4588 
4589 	err = got_object_id_str(&id_str, commit_id);
4590 	if (err) {
4591 		err = got_error_from_errno("got_object_id_str");
4592 		goto done;
4593 	}
4594 
4595 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4596 	if (err)
4597 		goto done;
4598 
4599 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4600 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4601 	if (n < 0) {
4602 		err = got_error_from_errno("fprintf");
4603 		goto done;
4604 	}
4605 	outoff += n;
4606 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4607 	if (err)
4608 		goto done;
4609 
4610 	n = fprintf(outfile, "from: %s\n",
4611 	    got_object_commit_get_author(commit));
4612 	if (n < 0) {
4613 		err = got_error_from_errno("fprintf");
4614 		goto done;
4615 	}
4616 	outoff += n;
4617 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4618 	if (err)
4619 		goto done;
4620 
4621 	committer_time = got_object_commit_get_committer_time(commit);
4622 	datestr = get_datestr(&committer_time, datebuf);
4623 	if (datestr) {
4624 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4625 		if (n < 0) {
4626 			err = got_error_from_errno("fprintf");
4627 			goto done;
4628 		}
4629 		outoff += n;
4630 		err = add_line_metadata(lines, nlines, outoff,
4631 		    GOT_DIFF_LINE_DATE);
4632 		if (err)
4633 			goto done;
4634 	}
4635 	author = got_object_commit_get_author(commit);
4636 	committer = got_object_commit_get_committer(commit);
4637 	if (strcmp(author, committer) != 0) {
4638 		n = fprintf(outfile, "via: %s\n", committer);
4639 		if (n < 0) {
4640 			err = got_error_from_errno("fprintf");
4641 			goto done;
4642 		}
4643 		outoff += n;
4644 		err = add_line_metadata(lines, nlines, outoff,
4645 		    GOT_DIFF_LINE_AUTHOR);
4646 		if (err)
4647 			goto done;
4648 	}
4649 	if (got_object_commit_get_nparents(commit) > 1) {
4650 		const struct got_object_id_queue *parent_ids;
4651 		struct got_object_qid *qid;
4652 		int pn = 1;
4653 		parent_ids = got_object_commit_get_parent_ids(commit);
4654 		STAILQ_FOREACH(qid, parent_ids, entry) {
4655 			err = got_object_id_str(&id_str, &qid->id);
4656 			if (err)
4657 				goto done;
4658 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4659 			if (n < 0) {
4660 				err = got_error_from_errno("fprintf");
4661 				goto done;
4662 			}
4663 			outoff += n;
4664 			err = add_line_metadata(lines, nlines, outoff,
4665 			    GOT_DIFF_LINE_META);
4666 			if (err)
4667 				goto done;
4668 			free(id_str);
4669 			id_str = NULL;
4670 		}
4671 	}
4672 
4673 	err = got_object_commit_get_logmsg(&logmsg, commit);
4674 	if (err)
4675 		goto done;
4676 	s = logmsg;
4677 	while ((line = strsep(&s, "\n")) != NULL) {
4678 		n = fprintf(outfile, "%s\n", line);
4679 		if (n < 0) {
4680 			err = got_error_from_errno("fprintf");
4681 			goto done;
4682 		}
4683 		outoff += n;
4684 		err = add_line_metadata(lines, nlines, outoff,
4685 		    GOT_DIFF_LINE_LOGMSG);
4686 		if (err)
4687 			goto done;
4688 	}
4689 
4690 	err = get_changed_paths(&changed_paths, commit, repo, &dsa);
4691 	if (err)
4692 		goto done;
4693 
4694 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4695 		struct got_diff_changed_path *cp = pe->data;
4696 		int pad = dsa.max_path_len - pe->path_len + 1;
4697 
4698 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
4699 		    pe->path, pad, ' ', dsa.add_cols + 1, cp->add,
4700 		    dsa.rm_cols + 1, cp->rm);
4701 		if (n < 0) {
4702 			err = got_error_from_errno("fprintf");
4703 			goto done;
4704 		}
4705 		outoff += n;
4706 		err = add_line_metadata(lines, nlines, outoff,
4707 		    GOT_DIFF_LINE_CHANGES);
4708 		if (err)
4709 			goto done;
4710 		free((char *)pe->path);
4711 		free(pe->data);
4712 	}
4713 
4714 	fputc('\n', outfile);
4715 	outoff++;
4716 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4717 	if (err)
4718 		goto done;
4719 
4720 	n = fprintf(outfile,
4721 	    "%d file%s changed, %d insertions(+), %d deletions(-)\n",
4722 	    dsa.nfiles, dsa.nfiles > 1 ? "s" : "", dsa.ins, dsa.del);
4723 	if (n < 0) {
4724 		err = got_error_from_errno("fprintf");
4725 		goto done;
4726 	}
4727 	outoff += n;
4728 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4729 	if (err)
4730 		goto done;
4731 
4732 	fputc('\n', outfile);
4733 	outoff++;
4734 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4735 done:
4736 	got_pathlist_free(&changed_paths);
4737 	free(id_str);
4738 	free(logmsg);
4739 	free(refs_str);
4740 	got_object_commit_close(commit);
4741 	if (err) {
4742 		free(*lines);
4743 		*lines = NULL;
4744 		*nlines = 0;
4745 	}
4746 	return err;
4747 }
4748 
4749 static const struct got_error *
4750 create_diff(struct tog_diff_view_state *s)
4751 {
4752 	const struct got_error *err = NULL;
4753 	FILE *f = NULL;
4754 	int obj_type;
4755 
4756 	free(s->lines);
4757 	s->lines = malloc(sizeof(*s->lines));
4758 	if (s->lines == NULL)
4759 		return got_error_from_errno("malloc");
4760 	s->nlines = 0;
4761 
4762 	f = got_opentemp();
4763 	if (f == NULL) {
4764 		err = got_error_from_errno("got_opentemp");
4765 		goto done;
4766 	}
4767 	if (s->f && fclose(s->f) == EOF) {
4768 		err = got_error_from_errno("fclose");
4769 		goto done;
4770 	}
4771 	s->f = f;
4772 
4773 	if (s->id1)
4774 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4775 	else
4776 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4777 	if (err)
4778 		goto done;
4779 
4780 	switch (obj_type) {
4781 	case GOT_OBJ_TYPE_BLOB:
4782 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4783 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4784 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4785 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4786 		break;
4787 	case GOT_OBJ_TYPE_TREE:
4788 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4789 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4790 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4791 		    s->force_text_diff, s->repo, s->f);
4792 		break;
4793 	case GOT_OBJ_TYPE_COMMIT: {
4794 		const struct got_object_id_queue *parent_ids;
4795 		struct got_object_qid *pid;
4796 		struct got_commit_object *commit2;
4797 		struct got_reflist_head *refs;
4798 
4799 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4800 		if (err)
4801 			goto done;
4802 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4803 		/* Show commit info if we're diffing to a parent/root commit. */
4804 		if (s->id1 == NULL) {
4805 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4806 			    refs, s->repo, s->ignore_whitespace,
4807 			    s->force_text_diff, s->f);
4808 			if (err)
4809 				goto done;
4810 		} else {
4811 			parent_ids = got_object_commit_get_parent_ids(commit2);
4812 			STAILQ_FOREACH(pid, parent_ids, entry) {
4813 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4814 					err = write_commit_info(&s->lines,
4815 					    &s->nlines, s->id2, refs, s->repo,
4816 					    s->ignore_whitespace,
4817 					    s->force_text_diff, s->f);
4818 					if (err)
4819 						goto done;
4820 					break;
4821 				}
4822 			}
4823 		}
4824 		got_object_commit_close(commit2);
4825 
4826 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4827 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4828 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4829 		    s->force_text_diff, s->repo, s->f);
4830 		break;
4831 	}
4832 	default:
4833 		err = got_error(GOT_ERR_OBJ_TYPE);
4834 		break;
4835 	}
4836 done:
4837 	if (s->f && fflush(s->f) != 0 && err == NULL)
4838 		err = got_error_from_errno("fflush");
4839 	return err;
4840 }
4841 
4842 static void
4843 diff_view_indicate_progress(struct tog_view *view)
4844 {
4845 	mvwaddstr(view->window, 0, 0, "diffing...");
4846 	update_panels();
4847 	doupdate();
4848 }
4849 
4850 static const struct got_error *
4851 search_start_diff_view(struct tog_view *view)
4852 {
4853 	struct tog_diff_view_state *s = &view->state.diff;
4854 
4855 	s->matched_line = 0;
4856 	return NULL;
4857 }
4858 
4859 static void
4860 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4861     size_t *nlines, int **first, int **last, int **match, int **selected)
4862 {
4863 	struct tog_diff_view_state *s = &view->state.diff;
4864 
4865 	*f = s->f;
4866 	*nlines = s->nlines;
4867 	*line_offsets = NULL;
4868 	*match = &s->matched_line;
4869 	*first = &s->first_displayed_line;
4870 	*last = &s->last_displayed_line;
4871 	*selected = &s->selected_line;
4872 }
4873 
4874 static const struct got_error *
4875 search_next_view_match(struct tog_view *view)
4876 {
4877 	const struct got_error *err = NULL;
4878 	FILE *f;
4879 	int lineno;
4880 	char *line = NULL;
4881 	size_t linesize = 0;
4882 	ssize_t linelen;
4883 	off_t *line_offsets;
4884 	size_t nlines = 0;
4885 	int *first, *last, *match, *selected;
4886 
4887 	if (!view->search_setup)
4888 		return got_error_msg(GOT_ERR_NOT_IMPL,
4889 		    "view search not supported");
4890 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4891 	    &match, &selected);
4892 
4893 	if (!view->searching) {
4894 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4895 		return NULL;
4896 	}
4897 
4898 	if (*match) {
4899 		if (view->searching == TOG_SEARCH_FORWARD)
4900 			lineno = *match + 1;
4901 		else
4902 			lineno = *match - 1;
4903 	} else
4904 		lineno = *first - 1 + *selected;
4905 
4906 	while (1) {
4907 		off_t offset;
4908 
4909 		if (lineno <= 0 || lineno > nlines) {
4910 			if (*match == 0) {
4911 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4912 				break;
4913 			}
4914 
4915 			if (view->searching == TOG_SEARCH_FORWARD)
4916 				lineno = 1;
4917 			else
4918 				lineno = nlines;
4919 		}
4920 
4921 		offset = view->type == TOG_VIEW_DIFF ?
4922 		    view->state.diff.lines[lineno - 1].offset :
4923 		    line_offsets[lineno - 1];
4924 		if (fseeko(f, offset, SEEK_SET) != 0) {
4925 			free(line);
4926 			return got_error_from_errno("fseeko");
4927 		}
4928 		linelen = getline(&line, &linesize, f);
4929 		if (linelen != -1) {
4930 			char *exstr;
4931 			err = expand_tab(&exstr, line);
4932 			if (err)
4933 				break;
4934 			if (match_line(exstr, &view->regex, 1,
4935 			    &view->regmatch)) {
4936 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4937 				*match = lineno;
4938 				free(exstr);
4939 				break;
4940 			}
4941 			free(exstr);
4942 		}
4943 		if (view->searching == TOG_SEARCH_FORWARD)
4944 			lineno++;
4945 		else
4946 			lineno--;
4947 	}
4948 	free(line);
4949 
4950 	if (*match) {
4951 		*first = *match;
4952 		*selected = 1;
4953 	}
4954 
4955 	return err;
4956 }
4957 
4958 static const struct got_error *
4959 close_diff_view(struct tog_view *view)
4960 {
4961 	const struct got_error *err = NULL;
4962 	struct tog_diff_view_state *s = &view->state.diff;
4963 
4964 	free(s->id1);
4965 	s->id1 = NULL;
4966 	free(s->id2);
4967 	s->id2 = NULL;
4968 	if (s->f && fclose(s->f) == EOF)
4969 		err = got_error_from_errno("fclose");
4970 	s->f = NULL;
4971 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4972 		err = got_error_from_errno("fclose");
4973 	s->f1 = NULL;
4974 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4975 		err = got_error_from_errno("fclose");
4976 	s->f2 = NULL;
4977 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4978 		err = got_error_from_errno("close");
4979 	s->fd1 = -1;
4980 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4981 		err = got_error_from_errno("close");
4982 	s->fd2 = -1;
4983 	free(s->lines);
4984 	s->lines = NULL;
4985 	s->nlines = 0;
4986 	return err;
4987 }
4988 
4989 static const struct got_error *
4990 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4991     struct got_object_id *id2, const char *label1, const char *label2,
4992     int diff_context, int ignore_whitespace, int force_text_diff,
4993     struct tog_view *parent_view, struct got_repository *repo)
4994 {
4995 	const struct got_error *err;
4996 	struct tog_diff_view_state *s = &view->state.diff;
4997 
4998 	memset(s, 0, sizeof(*s));
4999 	s->fd1 = -1;
5000 	s->fd2 = -1;
5001 
5002 	if (id1 != NULL && id2 != NULL) {
5003 	    int type1, type2;
5004 	    err = got_object_get_type(&type1, repo, id1);
5005 	    if (err)
5006 		return err;
5007 	    err = got_object_get_type(&type2, repo, id2);
5008 	    if (err)
5009 		return err;
5010 
5011 	    if (type1 != type2)
5012 		return got_error(GOT_ERR_OBJ_TYPE);
5013 	}
5014 	s->first_displayed_line = 1;
5015 	s->last_displayed_line = view->nlines;
5016 	s->selected_line = 1;
5017 	s->repo = repo;
5018 	s->id1 = id1;
5019 	s->id2 = id2;
5020 	s->label1 = label1;
5021 	s->label2 = label2;
5022 
5023 	if (id1) {
5024 		s->id1 = got_object_id_dup(id1);
5025 		if (s->id1 == NULL)
5026 			return got_error_from_errno("got_object_id_dup");
5027 	} else
5028 		s->id1 = NULL;
5029 
5030 	s->id2 = got_object_id_dup(id2);
5031 	if (s->id2 == NULL) {
5032 		err = got_error_from_errno("got_object_id_dup");
5033 		goto done;
5034 	}
5035 
5036 	s->f1 = got_opentemp();
5037 	if (s->f1 == NULL) {
5038 		err = got_error_from_errno("got_opentemp");
5039 		goto done;
5040 	}
5041 
5042 	s->f2 = got_opentemp();
5043 	if (s->f2 == NULL) {
5044 		err = got_error_from_errno("got_opentemp");
5045 		goto done;
5046 	}
5047 
5048 	s->fd1 = got_opentempfd();
5049 	if (s->fd1 == -1) {
5050 		err = got_error_from_errno("got_opentempfd");
5051 		goto done;
5052 	}
5053 
5054 	s->fd2 = got_opentempfd();
5055 	if (s->fd2 == -1) {
5056 		err = got_error_from_errno("got_opentempfd");
5057 		goto done;
5058 	}
5059 
5060 	s->first_displayed_line = 1;
5061 	s->last_displayed_line = view->nlines;
5062 	s->diff_context = diff_context;
5063 	s->ignore_whitespace = ignore_whitespace;
5064 	s->force_text_diff = force_text_diff;
5065 	s->parent_view = parent_view;
5066 	s->repo = repo;
5067 
5068 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5069 		int rc;
5070 
5071 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5072 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5073 		if (rc != ERR)
5074 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5075 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5076 		if (rc != ERR)
5077 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5078 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5079 		if (rc != ERR)
5080 			rc = init_pair(GOT_DIFF_LINE_META,
5081 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5082 		if (rc != ERR)
5083 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5084 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5085 		if (rc != ERR)
5086 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5087 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5088 		if (rc != ERR)
5089 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5090 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5091 		if (rc != ERR)
5092 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5093 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5094 		if (rc != ERR)
5095 			rc = init_pair(GOT_DIFF_LINE_DATE,
5096 			    get_color_value("TOG_COLOR_DATE"), -1);
5097 		if (rc == ERR) {
5098 			err = got_error(GOT_ERR_RANGE);
5099 			goto done;
5100 		}
5101 	}
5102 
5103 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5104 	    view_is_splitscreen(view))
5105 		show_log_view(parent_view); /* draw border */
5106 	diff_view_indicate_progress(view);
5107 
5108 	err = create_diff(s);
5109 
5110 	view->show = show_diff_view;
5111 	view->input = input_diff_view;
5112 	view->reset = reset_diff_view;
5113 	view->close = close_diff_view;
5114 	view->search_start = search_start_diff_view;
5115 	view->search_setup = search_setup_diff_view;
5116 	view->search_next = search_next_view_match;
5117 done:
5118 	if (err)
5119 		close_diff_view(view);
5120 	return err;
5121 }
5122 
5123 static const struct got_error *
5124 show_diff_view(struct tog_view *view)
5125 {
5126 	const struct got_error *err;
5127 	struct tog_diff_view_state *s = &view->state.diff;
5128 	char *id_str1 = NULL, *id_str2, *header;
5129 	const char *label1, *label2;
5130 
5131 	if (s->id1) {
5132 		err = got_object_id_str(&id_str1, s->id1);
5133 		if (err)
5134 			return err;
5135 		label1 = s->label1 ? s->label1 : id_str1;
5136 	} else
5137 		label1 = "/dev/null";
5138 
5139 	err = got_object_id_str(&id_str2, s->id2);
5140 	if (err)
5141 		return err;
5142 	label2 = s->label2 ? s->label2 : id_str2;
5143 
5144 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5145 		err = got_error_from_errno("asprintf");
5146 		free(id_str1);
5147 		free(id_str2);
5148 		return err;
5149 	}
5150 	free(id_str1);
5151 	free(id_str2);
5152 
5153 	err = draw_file(view, header);
5154 	free(header);
5155 	return err;
5156 }
5157 
5158 static const struct got_error *
5159 set_selected_commit(struct tog_diff_view_state *s,
5160     struct commit_queue_entry *entry)
5161 {
5162 	const struct got_error *err;
5163 	const struct got_object_id_queue *parent_ids;
5164 	struct got_commit_object *selected_commit;
5165 	struct got_object_qid *pid;
5166 
5167 	free(s->id2);
5168 	s->id2 = got_object_id_dup(entry->id);
5169 	if (s->id2 == NULL)
5170 		return got_error_from_errno("got_object_id_dup");
5171 
5172 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5173 	if (err)
5174 		return err;
5175 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5176 	free(s->id1);
5177 	pid = STAILQ_FIRST(parent_ids);
5178 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5179 	got_object_commit_close(selected_commit);
5180 	return NULL;
5181 }
5182 
5183 static const struct got_error *
5184 reset_diff_view(struct tog_view *view)
5185 {
5186 	struct tog_diff_view_state *s = &view->state.diff;
5187 
5188 	view->count = 0;
5189 	wclear(view->window);
5190 	s->first_displayed_line = 1;
5191 	s->last_displayed_line = view->nlines;
5192 	s->matched_line = 0;
5193 	diff_view_indicate_progress(view);
5194 	return create_diff(s);
5195 }
5196 
5197 static void
5198 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5199 {
5200 	int start, i;
5201 
5202 	i = start = s->first_displayed_line - 1;
5203 
5204 	while (s->lines[i].type != type) {
5205 		if (i == 0)
5206 			i = s->nlines - 1;
5207 		if (--i == start)
5208 			return; /* do nothing, requested type not in file */
5209 	}
5210 
5211 	s->selected_line = 1;
5212 	s->first_displayed_line = i;
5213 }
5214 
5215 static void
5216 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5217 {
5218 	int start, i;
5219 
5220 	i = start = s->first_displayed_line + 1;
5221 
5222 	while (s->lines[i].type != type) {
5223 		if (i == s->nlines - 1)
5224 			i = 0;
5225 		if (++i == start)
5226 			return; /* do nothing, requested type not in file */
5227 	}
5228 
5229 	s->selected_line = 1;
5230 	s->first_displayed_line = i;
5231 }
5232 
5233 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5234     int, int, int);
5235 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5236     int, int);
5237 
5238 static const struct got_error *
5239 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5240 {
5241 	const struct got_error *err = NULL;
5242 	struct tog_diff_view_state *s = &view->state.diff;
5243 	struct tog_log_view_state *ls;
5244 	struct commit_queue_entry *old_selected_entry;
5245 	char *line = NULL;
5246 	size_t linesize = 0;
5247 	ssize_t linelen;
5248 	int i, nscroll = view->nlines - 1, up = 0;
5249 
5250 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5251 
5252 	switch (ch) {
5253 	case '0':
5254 		view->x = 0;
5255 		break;
5256 	case '$':
5257 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5258 		view->count = 0;
5259 		break;
5260 	case KEY_RIGHT:
5261 	case 'l':
5262 		if (view->x + view->ncols / 3 < view->maxx)
5263 			view->x += 2;  /* move two columns right */
5264 		else
5265 			view->count = 0;
5266 		break;
5267 	case KEY_LEFT:
5268 	case 'h':
5269 		view->x -= MIN(view->x, 2);  /* move two columns back */
5270 		if (view->x <= 0)
5271 			view->count = 0;
5272 		break;
5273 	case 'a':
5274 	case 'w':
5275 		if (ch == 'a')
5276 			s->force_text_diff = !s->force_text_diff;
5277 		else if (ch == 'w')
5278 			s->ignore_whitespace = !s->ignore_whitespace;
5279 		err = reset_diff_view(view);
5280 		break;
5281 	case 'g':
5282 	case KEY_HOME:
5283 		s->first_displayed_line = 1;
5284 		view->count = 0;
5285 		break;
5286 	case 'G':
5287 	case KEY_END:
5288 		view->count = 0;
5289 		if (s->eof)
5290 			break;
5291 
5292 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5293 		s->eof = 1;
5294 		break;
5295 	case 'k':
5296 	case KEY_UP:
5297 	case CTRL('p'):
5298 		if (s->first_displayed_line > 1)
5299 			s->first_displayed_line--;
5300 		else
5301 			view->count = 0;
5302 		break;
5303 	case CTRL('u'):
5304 	case 'u':
5305 		nscroll /= 2;
5306 		/* FALL THROUGH */
5307 	case KEY_PPAGE:
5308 	case CTRL('b'):
5309 	case 'b':
5310 		if (s->first_displayed_line == 1) {
5311 			view->count = 0;
5312 			break;
5313 		}
5314 		i = 0;
5315 		while (i++ < nscroll && s->first_displayed_line > 1)
5316 			s->first_displayed_line--;
5317 		break;
5318 	case 'j':
5319 	case KEY_DOWN:
5320 	case CTRL('n'):
5321 		if (!s->eof)
5322 			s->first_displayed_line++;
5323 		else
5324 			view->count = 0;
5325 		break;
5326 	case CTRL('d'):
5327 	case 'd':
5328 		nscroll /= 2;
5329 		/* FALL THROUGH */
5330 	case KEY_NPAGE:
5331 	case CTRL('f'):
5332 	case 'f':
5333 	case ' ':
5334 		if (s->eof) {
5335 			view->count = 0;
5336 			break;
5337 		}
5338 		i = 0;
5339 		while (!s->eof && i++ < nscroll) {
5340 			linelen = getline(&line, &linesize, s->f);
5341 			s->first_displayed_line++;
5342 			if (linelen == -1) {
5343 				if (feof(s->f)) {
5344 					s->eof = 1;
5345 				} else
5346 					err = got_ferror(s->f, GOT_ERR_IO);
5347 				break;
5348 			}
5349 		}
5350 		free(line);
5351 		break;
5352 	case '(':
5353 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5354 		break;
5355 	case ')':
5356 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5357 		break;
5358 	case '{':
5359 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5360 		break;
5361 	case '}':
5362 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5363 		break;
5364 	case '[':
5365 		if (s->diff_context > 0) {
5366 			s->diff_context--;
5367 			s->matched_line = 0;
5368 			diff_view_indicate_progress(view);
5369 			err = create_diff(s);
5370 			if (s->first_displayed_line + view->nlines - 1 >
5371 			    s->nlines) {
5372 				s->first_displayed_line = 1;
5373 				s->last_displayed_line = view->nlines;
5374 			}
5375 		} else
5376 			view->count = 0;
5377 		break;
5378 	case ']':
5379 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5380 			s->diff_context++;
5381 			s->matched_line = 0;
5382 			diff_view_indicate_progress(view);
5383 			err = create_diff(s);
5384 		} else
5385 			view->count = 0;
5386 		break;
5387 	case '<':
5388 	case ',':
5389 	case 'K':
5390 		up = 1;
5391 		/* FALL THROUGH */
5392 	case '>':
5393 	case '.':
5394 	case 'J':
5395 		if (s->parent_view == NULL) {
5396 			view->count = 0;
5397 			break;
5398 		}
5399 		s->parent_view->count = view->count;
5400 
5401 		if (s->parent_view->type == TOG_VIEW_LOG) {
5402 			ls = &s->parent_view->state.log;
5403 			old_selected_entry = ls->selected_entry;
5404 
5405 			err = input_log_view(NULL, s->parent_view,
5406 			    up ? KEY_UP : KEY_DOWN);
5407 			if (err)
5408 				break;
5409 			view->count = s->parent_view->count;
5410 
5411 			if (old_selected_entry == ls->selected_entry)
5412 				break;
5413 
5414 			err = set_selected_commit(s, ls->selected_entry);
5415 			if (err)
5416 				break;
5417 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5418 			struct tog_blame_view_state *bs;
5419 			struct got_object_id *id, *prev_id;
5420 
5421 			bs = &s->parent_view->state.blame;
5422 			prev_id = get_annotation_for_line(bs->blame.lines,
5423 			    bs->blame.nlines, bs->last_diffed_line);
5424 
5425 			err = input_blame_view(&view, s->parent_view,
5426 			    up ? KEY_UP : KEY_DOWN);
5427 			if (err)
5428 				break;
5429 			view->count = s->parent_view->count;
5430 
5431 			if (prev_id == NULL)
5432 				break;
5433 			id = get_selected_commit_id(bs->blame.lines,
5434 			    bs->blame.nlines, bs->first_displayed_line,
5435 			    bs->selected_line);
5436 			if (id == NULL)
5437 				break;
5438 
5439 			if (!got_object_id_cmp(prev_id, id))
5440 				break;
5441 
5442 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5443 			if (err)
5444 				break;
5445 		}
5446 		s->first_displayed_line = 1;
5447 		s->last_displayed_line = view->nlines;
5448 		s->matched_line = 0;
5449 		view->x = 0;
5450 
5451 		diff_view_indicate_progress(view);
5452 		err = create_diff(s);
5453 		break;
5454 	default:
5455 		view->count = 0;
5456 		break;
5457 	}
5458 
5459 	return err;
5460 }
5461 
5462 static const struct got_error *
5463 cmd_diff(int argc, char *argv[])
5464 {
5465 	const struct got_error *error = NULL;
5466 	struct got_repository *repo = NULL;
5467 	struct got_worktree *worktree = NULL;
5468 	struct got_object_id *id1 = NULL, *id2 = NULL;
5469 	char *repo_path = NULL, *cwd = NULL;
5470 	char *id_str1 = NULL, *id_str2 = NULL;
5471 	char *label1 = NULL, *label2 = NULL;
5472 	int diff_context = 3, ignore_whitespace = 0;
5473 	int ch, force_text_diff = 0;
5474 	const char *errstr;
5475 	struct tog_view *view;
5476 	int *pack_fds = NULL;
5477 
5478 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5479 		switch (ch) {
5480 		case 'a':
5481 			force_text_diff = 1;
5482 			break;
5483 		case 'C':
5484 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5485 			    &errstr);
5486 			if (errstr != NULL)
5487 				errx(1, "number of context lines is %s: %s",
5488 				    errstr, errstr);
5489 			break;
5490 		case 'r':
5491 			repo_path = realpath(optarg, NULL);
5492 			if (repo_path == NULL)
5493 				return got_error_from_errno2("realpath",
5494 				    optarg);
5495 			got_path_strip_trailing_slashes(repo_path);
5496 			break;
5497 		case 'w':
5498 			ignore_whitespace = 1;
5499 			break;
5500 		default:
5501 			usage_diff();
5502 			/* NOTREACHED */
5503 		}
5504 	}
5505 
5506 	argc -= optind;
5507 	argv += optind;
5508 
5509 	if (argc == 0) {
5510 		usage_diff(); /* TODO show local worktree changes */
5511 	} else if (argc == 2) {
5512 		id_str1 = argv[0];
5513 		id_str2 = argv[1];
5514 	} else
5515 		usage_diff();
5516 
5517 	error = got_repo_pack_fds_open(&pack_fds);
5518 	if (error)
5519 		goto done;
5520 
5521 	if (repo_path == NULL) {
5522 		cwd = getcwd(NULL, 0);
5523 		if (cwd == NULL)
5524 			return got_error_from_errno("getcwd");
5525 		error = got_worktree_open(&worktree, cwd);
5526 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5527 			goto done;
5528 		if (worktree)
5529 			repo_path =
5530 			    strdup(got_worktree_get_repo_path(worktree));
5531 		else
5532 			repo_path = strdup(cwd);
5533 		if (repo_path == NULL) {
5534 			error = got_error_from_errno("strdup");
5535 			goto done;
5536 		}
5537 	}
5538 
5539 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5540 	if (error)
5541 		goto done;
5542 
5543 	init_curses();
5544 
5545 	error = apply_unveil(got_repo_get_path(repo), NULL);
5546 	if (error)
5547 		goto done;
5548 
5549 	error = tog_load_refs(repo, 0);
5550 	if (error)
5551 		goto done;
5552 
5553 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5554 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5555 	if (error)
5556 		goto done;
5557 
5558 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5559 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5560 	if (error)
5561 		goto done;
5562 
5563 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5564 	if (view == NULL) {
5565 		error = got_error_from_errno("view_open");
5566 		goto done;
5567 	}
5568 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5569 	    ignore_whitespace, force_text_diff, NULL,  repo);
5570 	if (error)
5571 		goto done;
5572 	error = view_loop(view);
5573 done:
5574 	free(label1);
5575 	free(label2);
5576 	free(repo_path);
5577 	free(cwd);
5578 	if (repo) {
5579 		const struct got_error *close_err = got_repo_close(repo);
5580 		if (error == NULL)
5581 			error = close_err;
5582 	}
5583 	if (worktree)
5584 		got_worktree_close(worktree);
5585 	if (pack_fds) {
5586 		const struct got_error *pack_err =
5587 		    got_repo_pack_fds_close(pack_fds);
5588 		if (error == NULL)
5589 			error = pack_err;
5590 	}
5591 	tog_free_refs();
5592 	return error;
5593 }
5594 
5595 __dead static void
5596 usage_blame(void)
5597 {
5598 	endwin();
5599 	fprintf(stderr,
5600 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5601 	    getprogname());
5602 	exit(1);
5603 }
5604 
5605 struct tog_blame_line {
5606 	int annotated;
5607 	struct got_object_id *id;
5608 };
5609 
5610 static const struct got_error *
5611 draw_blame(struct tog_view *view)
5612 {
5613 	struct tog_blame_view_state *s = &view->state.blame;
5614 	struct tog_blame *blame = &s->blame;
5615 	regmatch_t *regmatch = &view->regmatch;
5616 	const struct got_error *err;
5617 	int lineno = 0, nprinted = 0;
5618 	char *line = NULL;
5619 	size_t linesize = 0;
5620 	ssize_t linelen;
5621 	wchar_t *wline;
5622 	int width;
5623 	struct tog_blame_line *blame_line;
5624 	struct got_object_id *prev_id = NULL;
5625 	char *id_str;
5626 	struct tog_color *tc;
5627 
5628 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5629 	if (err)
5630 		return err;
5631 
5632 	rewind(blame->f);
5633 	werase(view->window);
5634 
5635 	if (asprintf(&line, "commit %s", id_str) == -1) {
5636 		err = got_error_from_errno("asprintf");
5637 		free(id_str);
5638 		return err;
5639 	}
5640 
5641 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5642 	free(line);
5643 	line = NULL;
5644 	if (err)
5645 		return err;
5646 	if (view_needs_focus_indication(view))
5647 		wstandout(view->window);
5648 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5649 	if (tc)
5650 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5651 	waddwstr(view->window, wline);
5652 	while (width++ < view->ncols)
5653 		waddch(view->window, ' ');
5654 	if (tc)
5655 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5656 	if (view_needs_focus_indication(view))
5657 		wstandend(view->window);
5658 	free(wline);
5659 	wline = NULL;
5660 
5661 	if (view->gline > blame->nlines)
5662 		view->gline = blame->nlines;
5663 
5664 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5665 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5666 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5667 		free(id_str);
5668 		return got_error_from_errno("asprintf");
5669 	}
5670 	free(id_str);
5671 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5672 	free(line);
5673 	line = NULL;
5674 	if (err)
5675 		return err;
5676 	waddwstr(view->window, wline);
5677 	free(wline);
5678 	wline = NULL;
5679 	if (width < view->ncols - 1)
5680 		waddch(view->window, '\n');
5681 
5682 	s->eof = 0;
5683 	view->maxx = 0;
5684 	while (nprinted < view->nlines - 2) {
5685 		linelen = getline(&line, &linesize, blame->f);
5686 		if (linelen == -1) {
5687 			if (feof(blame->f)) {
5688 				s->eof = 1;
5689 				break;
5690 			}
5691 			free(line);
5692 			return got_ferror(blame->f, GOT_ERR_IO);
5693 		}
5694 		if (++lineno < s->first_displayed_line)
5695 			continue;
5696 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5697 			continue;
5698 
5699 		/* Set view->maxx based on full line length. */
5700 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5701 		if (err) {
5702 			free(line);
5703 			return err;
5704 		}
5705 		free(wline);
5706 		wline = NULL;
5707 		view->maxx = MAX(view->maxx, width);
5708 
5709 		if (nprinted == s->selected_line - 1)
5710 			wstandout(view->window);
5711 
5712 		if (blame->nlines > 0) {
5713 			blame_line = &blame->lines[lineno - 1];
5714 			if (blame_line->annotated && prev_id &&
5715 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5716 			    !(nprinted == s->selected_line - 1)) {
5717 				waddstr(view->window, "        ");
5718 			} else if (blame_line->annotated) {
5719 				char *id_str;
5720 				err = got_object_id_str(&id_str,
5721 				    blame_line->id);
5722 				if (err) {
5723 					free(line);
5724 					return err;
5725 				}
5726 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5727 				if (tc)
5728 					wattr_on(view->window,
5729 					    COLOR_PAIR(tc->colorpair), NULL);
5730 				wprintw(view->window, "%.8s", id_str);
5731 				if (tc)
5732 					wattr_off(view->window,
5733 					    COLOR_PAIR(tc->colorpair), NULL);
5734 				free(id_str);
5735 				prev_id = blame_line->id;
5736 			} else {
5737 				waddstr(view->window, "........");
5738 				prev_id = NULL;
5739 			}
5740 		} else {
5741 			waddstr(view->window, "........");
5742 			prev_id = NULL;
5743 		}
5744 
5745 		if (nprinted == s->selected_line - 1)
5746 			wstandend(view->window);
5747 		waddstr(view->window, " ");
5748 
5749 		if (view->ncols <= 9) {
5750 			width = 9;
5751 		} else if (s->first_displayed_line + nprinted ==
5752 		    s->matched_line &&
5753 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5754 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5755 			    view->window, view->x, regmatch);
5756 			if (err) {
5757 				free(line);
5758 				return err;
5759 			}
5760 			width += 9;
5761 		} else {
5762 			int skip;
5763 			err = format_line(&wline, &width, &skip, line,
5764 			    view->x, view->ncols - 9, 9, 1);
5765 			if (err) {
5766 				free(line);
5767 				return err;
5768 			}
5769 			waddwstr(view->window, &wline[skip]);
5770 			width += 9;
5771 			free(wline);
5772 			wline = NULL;
5773 		}
5774 
5775 		if (width <= view->ncols - 1)
5776 			waddch(view->window, '\n');
5777 		if (++nprinted == 1)
5778 			s->first_displayed_line = lineno;
5779 	}
5780 	free(line);
5781 	s->last_displayed_line = lineno;
5782 
5783 	view_border(view);
5784 
5785 	return NULL;
5786 }
5787 
5788 static const struct got_error *
5789 blame_cb(void *arg, int nlines, int lineno,
5790     struct got_commit_object *commit, struct got_object_id *id)
5791 {
5792 	const struct got_error *err = NULL;
5793 	struct tog_blame_cb_args *a = arg;
5794 	struct tog_blame_line *line;
5795 	int errcode;
5796 
5797 	if (nlines != a->nlines ||
5798 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5799 		return got_error(GOT_ERR_RANGE);
5800 
5801 	errcode = pthread_mutex_lock(&tog_mutex);
5802 	if (errcode)
5803 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5804 
5805 	if (*a->quit) {	/* user has quit the blame view */
5806 		err = got_error(GOT_ERR_ITER_COMPLETED);
5807 		goto done;
5808 	}
5809 
5810 	if (lineno == -1)
5811 		goto done; /* no change in this commit */
5812 
5813 	line = &a->lines[lineno - 1];
5814 	if (line->annotated)
5815 		goto done;
5816 
5817 	line->id = got_object_id_dup(id);
5818 	if (line->id == NULL) {
5819 		err = got_error_from_errno("got_object_id_dup");
5820 		goto done;
5821 	}
5822 	line->annotated = 1;
5823 done:
5824 	errcode = pthread_mutex_unlock(&tog_mutex);
5825 	if (errcode)
5826 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5827 	return err;
5828 }
5829 
5830 static void *
5831 blame_thread(void *arg)
5832 {
5833 	const struct got_error *err, *close_err;
5834 	struct tog_blame_thread_args *ta = arg;
5835 	struct tog_blame_cb_args *a = ta->cb_args;
5836 	int errcode, fd1 = -1, fd2 = -1;
5837 	FILE *f1 = NULL, *f2 = NULL;
5838 
5839 	fd1 = got_opentempfd();
5840 	if (fd1 == -1)
5841 		return (void *)got_error_from_errno("got_opentempfd");
5842 
5843 	fd2 = got_opentempfd();
5844 	if (fd2 == -1) {
5845 		err = got_error_from_errno("got_opentempfd");
5846 		goto done;
5847 	}
5848 
5849 	f1 = got_opentemp();
5850 	if (f1 == NULL) {
5851 		err = (void *)got_error_from_errno("got_opentemp");
5852 		goto done;
5853 	}
5854 	f2 = got_opentemp();
5855 	if (f2 == NULL) {
5856 		err = (void *)got_error_from_errno("got_opentemp");
5857 		goto done;
5858 	}
5859 
5860 	err = block_signals_used_by_main_thread();
5861 	if (err)
5862 		goto done;
5863 
5864 	err = got_blame(ta->path, a->commit_id, ta->repo,
5865 	    tog_diff_algo, blame_cb, ta->cb_args,
5866 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5867 	if (err && err->code == GOT_ERR_CANCELLED)
5868 		err = NULL;
5869 
5870 	errcode = pthread_mutex_lock(&tog_mutex);
5871 	if (errcode) {
5872 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5873 		goto done;
5874 	}
5875 
5876 	close_err = got_repo_close(ta->repo);
5877 	if (err == NULL)
5878 		err = close_err;
5879 	ta->repo = NULL;
5880 	*ta->complete = 1;
5881 
5882 	errcode = pthread_mutex_unlock(&tog_mutex);
5883 	if (errcode && err == NULL)
5884 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5885 
5886 done:
5887 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5888 		err = got_error_from_errno("close");
5889 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5890 		err = got_error_from_errno("close");
5891 	if (f1 && fclose(f1) == EOF && err == NULL)
5892 		err = got_error_from_errno("fclose");
5893 	if (f2 && fclose(f2) == EOF && err == NULL)
5894 		err = got_error_from_errno("fclose");
5895 
5896 	return (void *)err;
5897 }
5898 
5899 static struct got_object_id *
5900 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5901     int first_displayed_line, int selected_line)
5902 {
5903 	struct tog_blame_line *line;
5904 
5905 	if (nlines <= 0)
5906 		return NULL;
5907 
5908 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5909 	if (!line->annotated)
5910 		return NULL;
5911 
5912 	return line->id;
5913 }
5914 
5915 static struct got_object_id *
5916 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5917     int lineno)
5918 {
5919 	struct tog_blame_line *line;
5920 
5921 	if (nlines <= 0 || lineno >= nlines)
5922 		return NULL;
5923 
5924 	line = &lines[lineno - 1];
5925 	if (!line->annotated)
5926 		return NULL;
5927 
5928 	return line->id;
5929 }
5930 
5931 static const struct got_error *
5932 stop_blame(struct tog_blame *blame)
5933 {
5934 	const struct got_error *err = NULL;
5935 	int i;
5936 
5937 	if (blame->thread) {
5938 		int errcode;
5939 		errcode = pthread_mutex_unlock(&tog_mutex);
5940 		if (errcode)
5941 			return got_error_set_errno(errcode,
5942 			    "pthread_mutex_unlock");
5943 		errcode = pthread_join(blame->thread, (void **)&err);
5944 		if (errcode)
5945 			return got_error_set_errno(errcode, "pthread_join");
5946 		errcode = pthread_mutex_lock(&tog_mutex);
5947 		if (errcode)
5948 			return got_error_set_errno(errcode,
5949 			    "pthread_mutex_lock");
5950 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5951 			err = NULL;
5952 		blame->thread = NULL;
5953 	}
5954 	if (blame->thread_args.repo) {
5955 		const struct got_error *close_err;
5956 		close_err = got_repo_close(blame->thread_args.repo);
5957 		if (err == NULL)
5958 			err = close_err;
5959 		blame->thread_args.repo = NULL;
5960 	}
5961 	if (blame->f) {
5962 		if (fclose(blame->f) == EOF && err == NULL)
5963 			err = got_error_from_errno("fclose");
5964 		blame->f = NULL;
5965 	}
5966 	if (blame->lines) {
5967 		for (i = 0; i < blame->nlines; i++)
5968 			free(blame->lines[i].id);
5969 		free(blame->lines);
5970 		blame->lines = NULL;
5971 	}
5972 	free(blame->cb_args.commit_id);
5973 	blame->cb_args.commit_id = NULL;
5974 	if (blame->pack_fds) {
5975 		const struct got_error *pack_err =
5976 		    got_repo_pack_fds_close(blame->pack_fds);
5977 		if (err == NULL)
5978 			err = pack_err;
5979 		blame->pack_fds = NULL;
5980 	}
5981 	return err;
5982 }
5983 
5984 static const struct got_error *
5985 cancel_blame_view(void *arg)
5986 {
5987 	const struct got_error *err = NULL;
5988 	int *done = arg;
5989 	int errcode;
5990 
5991 	errcode = pthread_mutex_lock(&tog_mutex);
5992 	if (errcode)
5993 		return got_error_set_errno(errcode,
5994 		    "pthread_mutex_unlock");
5995 
5996 	if (*done)
5997 		err = got_error(GOT_ERR_CANCELLED);
5998 
5999 	errcode = pthread_mutex_unlock(&tog_mutex);
6000 	if (errcode)
6001 		return got_error_set_errno(errcode,
6002 		    "pthread_mutex_lock");
6003 
6004 	return err;
6005 }
6006 
6007 static const struct got_error *
6008 run_blame(struct tog_view *view)
6009 {
6010 	struct tog_blame_view_state *s = &view->state.blame;
6011 	struct tog_blame *blame = &s->blame;
6012 	const struct got_error *err = NULL;
6013 	struct got_commit_object *commit = NULL;
6014 	struct got_blob_object *blob = NULL;
6015 	struct got_repository *thread_repo = NULL;
6016 	struct got_object_id *obj_id = NULL;
6017 	int obj_type, fd = -1;
6018 	int *pack_fds = NULL;
6019 
6020 	err = got_object_open_as_commit(&commit, s->repo,
6021 	    &s->blamed_commit->id);
6022 	if (err)
6023 		return err;
6024 
6025 	fd = got_opentempfd();
6026 	if (fd == -1) {
6027 		err = got_error_from_errno("got_opentempfd");
6028 		goto done;
6029 	}
6030 
6031 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6032 	if (err)
6033 		goto done;
6034 
6035 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6036 	if (err)
6037 		goto done;
6038 
6039 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6040 		err = got_error(GOT_ERR_OBJ_TYPE);
6041 		goto done;
6042 	}
6043 
6044 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6045 	if (err)
6046 		goto done;
6047 	blame->f = got_opentemp();
6048 	if (blame->f == NULL) {
6049 		err = got_error_from_errno("got_opentemp");
6050 		goto done;
6051 	}
6052 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6053 	    &blame->line_offsets, blame->f, blob);
6054 	if (err)
6055 		goto done;
6056 	if (blame->nlines == 0) {
6057 		s->blame_complete = 1;
6058 		goto done;
6059 	}
6060 
6061 	/* Don't include \n at EOF in the blame line count. */
6062 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6063 		blame->nlines--;
6064 
6065 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6066 	if (blame->lines == NULL) {
6067 		err = got_error_from_errno("calloc");
6068 		goto done;
6069 	}
6070 
6071 	err = got_repo_pack_fds_open(&pack_fds);
6072 	if (err)
6073 		goto done;
6074 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6075 	    pack_fds);
6076 	if (err)
6077 		goto done;
6078 
6079 	blame->pack_fds = pack_fds;
6080 	blame->cb_args.view = view;
6081 	blame->cb_args.lines = blame->lines;
6082 	blame->cb_args.nlines = blame->nlines;
6083 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6084 	if (blame->cb_args.commit_id == NULL) {
6085 		err = got_error_from_errno("got_object_id_dup");
6086 		goto done;
6087 	}
6088 	blame->cb_args.quit = &s->done;
6089 
6090 	blame->thread_args.path = s->path;
6091 	blame->thread_args.repo = thread_repo;
6092 	blame->thread_args.cb_args = &blame->cb_args;
6093 	blame->thread_args.complete = &s->blame_complete;
6094 	blame->thread_args.cancel_cb = cancel_blame_view;
6095 	blame->thread_args.cancel_arg = &s->done;
6096 	s->blame_complete = 0;
6097 
6098 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6099 		s->first_displayed_line = 1;
6100 		s->last_displayed_line = view->nlines;
6101 		s->selected_line = 1;
6102 	}
6103 	s->matched_line = 0;
6104 
6105 done:
6106 	if (commit)
6107 		got_object_commit_close(commit);
6108 	if (fd != -1 && close(fd) == -1 && err == NULL)
6109 		err = got_error_from_errno("close");
6110 	if (blob)
6111 		got_object_blob_close(blob);
6112 	free(obj_id);
6113 	if (err)
6114 		stop_blame(blame);
6115 	return err;
6116 }
6117 
6118 static const struct got_error *
6119 open_blame_view(struct tog_view *view, char *path,
6120     struct got_object_id *commit_id, struct got_repository *repo)
6121 {
6122 	const struct got_error *err = NULL;
6123 	struct tog_blame_view_state *s = &view->state.blame;
6124 
6125 	STAILQ_INIT(&s->blamed_commits);
6126 
6127 	s->path = strdup(path);
6128 	if (s->path == NULL)
6129 		return got_error_from_errno("strdup");
6130 
6131 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6132 	if (err) {
6133 		free(s->path);
6134 		return err;
6135 	}
6136 
6137 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6138 	s->first_displayed_line = 1;
6139 	s->last_displayed_line = view->nlines;
6140 	s->selected_line = 1;
6141 	s->blame_complete = 0;
6142 	s->repo = repo;
6143 	s->commit_id = commit_id;
6144 	memset(&s->blame, 0, sizeof(s->blame));
6145 
6146 	STAILQ_INIT(&s->colors);
6147 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6148 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6149 		    get_color_value("TOG_COLOR_COMMIT"));
6150 		if (err)
6151 			return err;
6152 	}
6153 
6154 	view->show = show_blame_view;
6155 	view->input = input_blame_view;
6156 	view->reset = reset_blame_view;
6157 	view->close = close_blame_view;
6158 	view->search_start = search_start_blame_view;
6159 	view->search_setup = search_setup_blame_view;
6160 	view->search_next = search_next_view_match;
6161 
6162 	return run_blame(view);
6163 }
6164 
6165 static const struct got_error *
6166 close_blame_view(struct tog_view *view)
6167 {
6168 	const struct got_error *err = NULL;
6169 	struct tog_blame_view_state *s = &view->state.blame;
6170 
6171 	if (s->blame.thread)
6172 		err = stop_blame(&s->blame);
6173 
6174 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6175 		struct got_object_qid *blamed_commit;
6176 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6177 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6178 		got_object_qid_free(blamed_commit);
6179 	}
6180 
6181 	free(s->path);
6182 	free_colors(&s->colors);
6183 	return err;
6184 }
6185 
6186 static const struct got_error *
6187 search_start_blame_view(struct tog_view *view)
6188 {
6189 	struct tog_blame_view_state *s = &view->state.blame;
6190 
6191 	s->matched_line = 0;
6192 	return NULL;
6193 }
6194 
6195 static void
6196 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6197     size_t *nlines, int **first, int **last, int **match, int **selected)
6198 {
6199 	struct tog_blame_view_state *s = &view->state.blame;
6200 
6201 	*f = s->blame.f;
6202 	*nlines = s->blame.nlines;
6203 	*line_offsets = s->blame.line_offsets;
6204 	*match = &s->matched_line;
6205 	*first = &s->first_displayed_line;
6206 	*last = &s->last_displayed_line;
6207 	*selected = &s->selected_line;
6208 }
6209 
6210 static const struct got_error *
6211 show_blame_view(struct tog_view *view)
6212 {
6213 	const struct got_error *err = NULL;
6214 	struct tog_blame_view_state *s = &view->state.blame;
6215 	int errcode;
6216 
6217 	if (s->blame.thread == NULL && !s->blame_complete) {
6218 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6219 		    &s->blame.thread_args);
6220 		if (errcode)
6221 			return got_error_set_errno(errcode, "pthread_create");
6222 
6223 		halfdelay(1); /* fast refresh while annotating  */
6224 	}
6225 
6226 	if (s->blame_complete)
6227 		halfdelay(10); /* disable fast refresh */
6228 
6229 	err = draw_blame(view);
6230 
6231 	view_border(view);
6232 	return err;
6233 }
6234 
6235 static const struct got_error *
6236 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6237     struct got_repository *repo, struct got_object_id *id)
6238 {
6239 	struct tog_view		*log_view;
6240 	const struct got_error	*err = NULL;
6241 
6242 	*new_view = NULL;
6243 
6244 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6245 	if (log_view == NULL)
6246 		return got_error_from_errno("view_open");
6247 
6248 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6249 	if (err)
6250 		view_close(log_view);
6251 	else
6252 		*new_view = log_view;
6253 
6254 	return err;
6255 }
6256 
6257 static const struct got_error *
6258 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6259 {
6260 	const struct got_error *err = NULL, *thread_err = NULL;
6261 	struct tog_view *diff_view;
6262 	struct tog_blame_view_state *s = &view->state.blame;
6263 	int eos, nscroll, begin_y = 0, begin_x = 0;
6264 
6265 	eos = nscroll = view->nlines - 2;
6266 	if (view_is_hsplit_top(view))
6267 		--eos;  /* border */
6268 
6269 	switch (ch) {
6270 	case '0':
6271 		view->x = 0;
6272 		break;
6273 	case '$':
6274 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6275 		view->count = 0;
6276 		break;
6277 	case KEY_RIGHT:
6278 	case 'l':
6279 		if (view->x + view->ncols / 3 < view->maxx)
6280 			view->x += 2;  /* move two columns right */
6281 		else
6282 			view->count = 0;
6283 		break;
6284 	case KEY_LEFT:
6285 	case 'h':
6286 		view->x -= MIN(view->x, 2);  /* move two columns back */
6287 		if (view->x <= 0)
6288 			view->count = 0;
6289 		break;
6290 	case 'q':
6291 		s->done = 1;
6292 		break;
6293 	case 'g':
6294 	case KEY_HOME:
6295 		s->selected_line = 1;
6296 		s->first_displayed_line = 1;
6297 		view->count = 0;
6298 		break;
6299 	case 'G':
6300 	case KEY_END:
6301 		if (s->blame.nlines < eos) {
6302 			s->selected_line = s->blame.nlines;
6303 			s->first_displayed_line = 1;
6304 		} else {
6305 			s->selected_line = eos;
6306 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6307 		}
6308 		view->count = 0;
6309 		break;
6310 	case 'k':
6311 	case KEY_UP:
6312 	case CTRL('p'):
6313 		if (s->selected_line > 1)
6314 			s->selected_line--;
6315 		else if (s->selected_line == 1 &&
6316 		    s->first_displayed_line > 1)
6317 			s->first_displayed_line--;
6318 		else
6319 			view->count = 0;
6320 		break;
6321 	case CTRL('u'):
6322 	case 'u':
6323 		nscroll /= 2;
6324 		/* FALL THROUGH */
6325 	case KEY_PPAGE:
6326 	case CTRL('b'):
6327 	case 'b':
6328 		if (s->first_displayed_line == 1) {
6329 			if (view->count > 1)
6330 				nscroll += nscroll;
6331 			s->selected_line = MAX(1, s->selected_line - nscroll);
6332 			view->count = 0;
6333 			break;
6334 		}
6335 		if (s->first_displayed_line > nscroll)
6336 			s->first_displayed_line -= nscroll;
6337 		else
6338 			s->first_displayed_line = 1;
6339 		break;
6340 	case 'j':
6341 	case KEY_DOWN:
6342 	case CTRL('n'):
6343 		if (s->selected_line < eos && s->first_displayed_line +
6344 		    s->selected_line <= s->blame.nlines)
6345 			s->selected_line++;
6346 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6347 			s->first_displayed_line++;
6348 		else
6349 			view->count = 0;
6350 		break;
6351 	case 'c':
6352 	case 'p': {
6353 		struct got_object_id *id = NULL;
6354 
6355 		view->count = 0;
6356 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6357 		    s->first_displayed_line, s->selected_line);
6358 		if (id == NULL)
6359 			break;
6360 		if (ch == 'p') {
6361 			struct got_commit_object *commit, *pcommit;
6362 			struct got_object_qid *pid;
6363 			struct got_object_id *blob_id = NULL;
6364 			int obj_type;
6365 			err = got_object_open_as_commit(&commit,
6366 			    s->repo, id);
6367 			if (err)
6368 				break;
6369 			pid = STAILQ_FIRST(
6370 			    got_object_commit_get_parent_ids(commit));
6371 			if (pid == NULL) {
6372 				got_object_commit_close(commit);
6373 				break;
6374 			}
6375 			/* Check if path history ends here. */
6376 			err = got_object_open_as_commit(&pcommit,
6377 			    s->repo, &pid->id);
6378 			if (err)
6379 				break;
6380 			err = got_object_id_by_path(&blob_id, s->repo,
6381 			    pcommit, s->path);
6382 			got_object_commit_close(pcommit);
6383 			if (err) {
6384 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6385 					err = NULL;
6386 				got_object_commit_close(commit);
6387 				break;
6388 			}
6389 			err = got_object_get_type(&obj_type, s->repo,
6390 			    blob_id);
6391 			free(blob_id);
6392 			/* Can't blame non-blob type objects. */
6393 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6394 				got_object_commit_close(commit);
6395 				break;
6396 			}
6397 			err = got_object_qid_alloc(&s->blamed_commit,
6398 			    &pid->id);
6399 			got_object_commit_close(commit);
6400 		} else {
6401 			if (got_object_id_cmp(id,
6402 			    &s->blamed_commit->id) == 0)
6403 				break;
6404 			err = got_object_qid_alloc(&s->blamed_commit,
6405 			    id);
6406 		}
6407 		if (err)
6408 			break;
6409 		s->done = 1;
6410 		thread_err = stop_blame(&s->blame);
6411 		s->done = 0;
6412 		if (thread_err)
6413 			break;
6414 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6415 		    s->blamed_commit, entry);
6416 		err = run_blame(view);
6417 		if (err)
6418 			break;
6419 		break;
6420 	}
6421 	case 'C': {
6422 		struct got_object_qid *first;
6423 
6424 		view->count = 0;
6425 		first = STAILQ_FIRST(&s->blamed_commits);
6426 		if (!got_object_id_cmp(&first->id, s->commit_id))
6427 			break;
6428 		s->done = 1;
6429 		thread_err = stop_blame(&s->blame);
6430 		s->done = 0;
6431 		if (thread_err)
6432 			break;
6433 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6434 		got_object_qid_free(s->blamed_commit);
6435 		s->blamed_commit =
6436 		    STAILQ_FIRST(&s->blamed_commits);
6437 		err = run_blame(view);
6438 		if (err)
6439 			break;
6440 		break;
6441 	}
6442 	case 'L':
6443 		view->count = 0;
6444 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6445 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6446 		if (s->id_to_log)
6447 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6448 		break;
6449 	case KEY_ENTER:
6450 	case '\r': {
6451 		struct got_object_id *id = NULL;
6452 		struct got_object_qid *pid;
6453 		struct got_commit_object *commit = NULL;
6454 
6455 		view->count = 0;
6456 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6457 		    s->first_displayed_line, s->selected_line);
6458 		if (id == NULL)
6459 			break;
6460 		err = got_object_open_as_commit(&commit, s->repo, id);
6461 		if (err)
6462 			break;
6463 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6464 		if (*new_view) {
6465 			/* traversed from diff view, release diff resources  */
6466 			err = close_diff_view(*new_view);
6467 			if (err)
6468 				break;
6469 			diff_view = *new_view;
6470 		} else {
6471 			if (view_is_parent_view(view))
6472 				view_get_split(view, &begin_y, &begin_x);
6473 
6474 			diff_view = view_open(0, 0, begin_y, begin_x,
6475 			    TOG_VIEW_DIFF);
6476 			if (diff_view == NULL) {
6477 				got_object_commit_close(commit);
6478 				err = got_error_from_errno("view_open");
6479 				break;
6480 			}
6481 		}
6482 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6483 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6484 		got_object_commit_close(commit);
6485 		if (err) {
6486 			view_close(diff_view);
6487 			break;
6488 		}
6489 		s->last_diffed_line = s->first_displayed_line - 1 +
6490 		    s->selected_line;
6491 		if (*new_view)
6492 			break;	/* still open from active diff view */
6493 		if (view_is_parent_view(view) &&
6494 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6495 			err = view_init_hsplit(view, begin_y);
6496 			if (err)
6497 				break;
6498 		}
6499 
6500 		view->focussed = 0;
6501 		diff_view->focussed = 1;
6502 		diff_view->mode = view->mode;
6503 		diff_view->nlines = view->lines - begin_y;
6504 		if (view_is_parent_view(view)) {
6505 			view_transfer_size(diff_view, view);
6506 			err = view_close_child(view);
6507 			if (err)
6508 				break;
6509 			err = view_set_child(view, diff_view);
6510 			if (err)
6511 				break;
6512 			view->focus_child = 1;
6513 		} else
6514 			*new_view = diff_view;
6515 		if (err)
6516 			break;
6517 		break;
6518 	}
6519 	case CTRL('d'):
6520 	case 'd':
6521 		nscroll /= 2;
6522 		/* FALL THROUGH */
6523 	case KEY_NPAGE:
6524 	case CTRL('f'):
6525 	case 'f':
6526 	case ' ':
6527 		if (s->last_displayed_line >= s->blame.nlines &&
6528 		    s->selected_line >= MIN(s->blame.nlines,
6529 		    view->nlines - 2)) {
6530 			view->count = 0;
6531 			break;
6532 		}
6533 		if (s->last_displayed_line >= s->blame.nlines &&
6534 		    s->selected_line < view->nlines - 2) {
6535 			s->selected_line +=
6536 			    MIN(nscroll, s->last_displayed_line -
6537 			    s->first_displayed_line - s->selected_line + 1);
6538 		}
6539 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6540 			s->first_displayed_line += nscroll;
6541 		else
6542 			s->first_displayed_line =
6543 			    s->blame.nlines - (view->nlines - 3);
6544 		break;
6545 	case KEY_RESIZE:
6546 		if (s->selected_line > view->nlines - 2) {
6547 			s->selected_line = MIN(s->blame.nlines,
6548 			    view->nlines - 2);
6549 		}
6550 		break;
6551 	default:
6552 		view->count = 0;
6553 		break;
6554 	}
6555 	return thread_err ? thread_err : err;
6556 }
6557 
6558 static const struct got_error *
6559 reset_blame_view(struct tog_view *view)
6560 {
6561 	const struct got_error *err;
6562 	struct tog_blame_view_state *s = &view->state.blame;
6563 
6564 	view->count = 0;
6565 	s->done = 1;
6566 	err = stop_blame(&s->blame);
6567 	s->done = 0;
6568 	if (err)
6569 		return err;
6570 	return run_blame(view);
6571 }
6572 
6573 static const struct got_error *
6574 cmd_blame(int argc, char *argv[])
6575 {
6576 	const struct got_error *error;
6577 	struct got_repository *repo = NULL;
6578 	struct got_worktree *worktree = NULL;
6579 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6580 	char *link_target = NULL;
6581 	struct got_object_id *commit_id = NULL;
6582 	struct got_commit_object *commit = NULL;
6583 	char *commit_id_str = NULL;
6584 	int ch;
6585 	struct tog_view *view;
6586 	int *pack_fds = NULL;
6587 
6588 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6589 		switch (ch) {
6590 		case 'c':
6591 			commit_id_str = optarg;
6592 			break;
6593 		case 'r':
6594 			repo_path = realpath(optarg, NULL);
6595 			if (repo_path == NULL)
6596 				return got_error_from_errno2("realpath",
6597 				    optarg);
6598 			break;
6599 		default:
6600 			usage_blame();
6601 			/* NOTREACHED */
6602 		}
6603 	}
6604 
6605 	argc -= optind;
6606 	argv += optind;
6607 
6608 	if (argc != 1)
6609 		usage_blame();
6610 
6611 	error = got_repo_pack_fds_open(&pack_fds);
6612 	if (error != NULL)
6613 		goto done;
6614 
6615 	if (repo_path == NULL) {
6616 		cwd = getcwd(NULL, 0);
6617 		if (cwd == NULL)
6618 			return got_error_from_errno("getcwd");
6619 		error = got_worktree_open(&worktree, cwd);
6620 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6621 			goto done;
6622 		if (worktree)
6623 			repo_path =
6624 			    strdup(got_worktree_get_repo_path(worktree));
6625 		else
6626 			repo_path = strdup(cwd);
6627 		if (repo_path == NULL) {
6628 			error = got_error_from_errno("strdup");
6629 			goto done;
6630 		}
6631 	}
6632 
6633 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6634 	if (error != NULL)
6635 		goto done;
6636 
6637 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6638 	    worktree);
6639 	if (error)
6640 		goto done;
6641 
6642 	init_curses();
6643 
6644 	error = apply_unveil(got_repo_get_path(repo), NULL);
6645 	if (error)
6646 		goto done;
6647 
6648 	error = tog_load_refs(repo, 0);
6649 	if (error)
6650 		goto done;
6651 
6652 	if (commit_id_str == NULL) {
6653 		struct got_reference *head_ref;
6654 		error = got_ref_open(&head_ref, repo, worktree ?
6655 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6656 		if (error != NULL)
6657 			goto done;
6658 		error = got_ref_resolve(&commit_id, repo, head_ref);
6659 		got_ref_close(head_ref);
6660 	} else {
6661 		error = got_repo_match_object_id(&commit_id, NULL,
6662 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6663 	}
6664 	if (error != NULL)
6665 		goto done;
6666 
6667 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6668 	if (view == NULL) {
6669 		error = got_error_from_errno("view_open");
6670 		goto done;
6671 	}
6672 
6673 	error = got_object_open_as_commit(&commit, repo, commit_id);
6674 	if (error)
6675 		goto done;
6676 
6677 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6678 	    commit, repo);
6679 	if (error)
6680 		goto done;
6681 
6682 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6683 	    commit_id, repo);
6684 	if (error)
6685 		goto done;
6686 	if (worktree) {
6687 		/* Release work tree lock. */
6688 		got_worktree_close(worktree);
6689 		worktree = NULL;
6690 	}
6691 	error = view_loop(view);
6692 done:
6693 	free(repo_path);
6694 	free(in_repo_path);
6695 	free(link_target);
6696 	free(cwd);
6697 	free(commit_id);
6698 	if (commit)
6699 		got_object_commit_close(commit);
6700 	if (worktree)
6701 		got_worktree_close(worktree);
6702 	if (repo) {
6703 		const struct got_error *close_err = got_repo_close(repo);
6704 		if (error == NULL)
6705 			error = close_err;
6706 	}
6707 	if (pack_fds) {
6708 		const struct got_error *pack_err =
6709 		    got_repo_pack_fds_close(pack_fds);
6710 		if (error == NULL)
6711 			error = pack_err;
6712 	}
6713 	tog_free_refs();
6714 	return error;
6715 }
6716 
6717 static const struct got_error *
6718 draw_tree_entries(struct tog_view *view, const char *parent_path)
6719 {
6720 	struct tog_tree_view_state *s = &view->state.tree;
6721 	const struct got_error *err = NULL;
6722 	struct got_tree_entry *te;
6723 	wchar_t *wline;
6724 	char *index = NULL;
6725 	struct tog_color *tc;
6726 	int width, n, nentries, i = 1;
6727 	int limit = view->nlines;
6728 
6729 	s->ndisplayed = 0;
6730 	if (view_is_hsplit_top(view))
6731 		--limit;  /* border */
6732 
6733 	werase(view->window);
6734 
6735 	if (limit == 0)
6736 		return NULL;
6737 
6738 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6739 	    0, 0);
6740 	if (err)
6741 		return err;
6742 	if (view_needs_focus_indication(view))
6743 		wstandout(view->window);
6744 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6745 	if (tc)
6746 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6747 	waddwstr(view->window, wline);
6748 	free(wline);
6749 	wline = NULL;
6750 	while (width++ < view->ncols)
6751 		waddch(view->window, ' ');
6752 	if (tc)
6753 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6754 	if (view_needs_focus_indication(view))
6755 		wstandend(view->window);
6756 	if (--limit <= 0)
6757 		return NULL;
6758 
6759 	i += s->selected;
6760 	if (s->first_displayed_entry) {
6761 		i += got_tree_entry_get_index(s->first_displayed_entry);
6762 		if (s->tree != s->root)
6763 			++i;  /* account for ".." entry */
6764 	}
6765 	nentries = got_object_tree_get_nentries(s->tree);
6766 	if (asprintf(&index, "[%d/%d] %s",
6767 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6768 		return got_error_from_errno("asprintf");
6769 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6770 	free(index);
6771 	if (err)
6772 		return err;
6773 	waddwstr(view->window, wline);
6774 	free(wline);
6775 	wline = NULL;
6776 	if (width < view->ncols - 1)
6777 		waddch(view->window, '\n');
6778 	if (--limit <= 0)
6779 		return NULL;
6780 	waddch(view->window, '\n');
6781 	if (--limit <= 0)
6782 		return NULL;
6783 
6784 	if (s->first_displayed_entry == NULL) {
6785 		te = got_object_tree_get_first_entry(s->tree);
6786 		if (s->selected == 0) {
6787 			if (view->focussed)
6788 				wstandout(view->window);
6789 			s->selected_entry = NULL;
6790 		}
6791 		waddstr(view->window, "  ..\n");	/* parent directory */
6792 		if (s->selected == 0 && view->focussed)
6793 			wstandend(view->window);
6794 		s->ndisplayed++;
6795 		if (--limit <= 0)
6796 			return NULL;
6797 		n = 1;
6798 	} else {
6799 		n = 0;
6800 		te = s->first_displayed_entry;
6801 	}
6802 
6803 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6804 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6805 		const char *modestr = "";
6806 		mode_t mode;
6807 
6808 		te = got_object_tree_get_entry(s->tree, i);
6809 		mode = got_tree_entry_get_mode(te);
6810 
6811 		if (s->show_ids) {
6812 			err = got_object_id_str(&id_str,
6813 			    got_tree_entry_get_id(te));
6814 			if (err)
6815 				return got_error_from_errno(
6816 				    "got_object_id_str");
6817 		}
6818 		if (got_object_tree_entry_is_submodule(te))
6819 			modestr = "$";
6820 		else if (S_ISLNK(mode)) {
6821 			int i;
6822 
6823 			err = got_tree_entry_get_symlink_target(&link_target,
6824 			    te, s->repo);
6825 			if (err) {
6826 				free(id_str);
6827 				return err;
6828 			}
6829 			for (i = 0; i < strlen(link_target); i++) {
6830 				if (!isprint((unsigned char)link_target[i]))
6831 					link_target[i] = '?';
6832 			}
6833 			modestr = "@";
6834 		}
6835 		else if (S_ISDIR(mode))
6836 			modestr = "/";
6837 		else if (mode & S_IXUSR)
6838 			modestr = "*";
6839 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6840 		    got_tree_entry_get_name(te), modestr,
6841 		    link_target ? " -> ": "",
6842 		    link_target ? link_target : "") == -1) {
6843 			free(id_str);
6844 			free(link_target);
6845 			return got_error_from_errno("asprintf");
6846 		}
6847 		free(id_str);
6848 		free(link_target);
6849 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6850 		    0, 0);
6851 		if (err) {
6852 			free(line);
6853 			break;
6854 		}
6855 		if (n == s->selected) {
6856 			if (view->focussed)
6857 				wstandout(view->window);
6858 			s->selected_entry = te;
6859 		}
6860 		tc = match_color(&s->colors, line);
6861 		if (tc)
6862 			wattr_on(view->window,
6863 			    COLOR_PAIR(tc->colorpair), NULL);
6864 		waddwstr(view->window, wline);
6865 		if (tc)
6866 			wattr_off(view->window,
6867 			    COLOR_PAIR(tc->colorpair), NULL);
6868 		if (width < view->ncols - 1)
6869 			waddch(view->window, '\n');
6870 		if (n == s->selected && view->focussed)
6871 			wstandend(view->window);
6872 		free(line);
6873 		free(wline);
6874 		wline = NULL;
6875 		n++;
6876 		s->ndisplayed++;
6877 		s->last_displayed_entry = te;
6878 		if (--limit <= 0)
6879 			break;
6880 	}
6881 
6882 	return err;
6883 }
6884 
6885 static void
6886 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6887 {
6888 	struct got_tree_entry *te;
6889 	int isroot = s->tree == s->root;
6890 	int i = 0;
6891 
6892 	if (s->first_displayed_entry == NULL)
6893 		return;
6894 
6895 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6896 	while (i++ < maxscroll) {
6897 		if (te == NULL) {
6898 			if (!isroot)
6899 				s->first_displayed_entry = NULL;
6900 			break;
6901 		}
6902 		s->first_displayed_entry = te;
6903 		te = got_tree_entry_get_prev(s->tree, te);
6904 	}
6905 }
6906 
6907 static const struct got_error *
6908 tree_scroll_down(struct tog_view *view, int maxscroll)
6909 {
6910 	struct tog_tree_view_state *s = &view->state.tree;
6911 	struct got_tree_entry *next, *last;
6912 	int n = 0;
6913 
6914 	if (s->first_displayed_entry)
6915 		next = got_tree_entry_get_next(s->tree,
6916 		    s->first_displayed_entry);
6917 	else
6918 		next = got_object_tree_get_first_entry(s->tree);
6919 
6920 	last = s->last_displayed_entry;
6921 	while (next && n++ < maxscroll) {
6922 		if (last) {
6923 			s->last_displayed_entry = last;
6924 			last = got_tree_entry_get_next(s->tree, last);
6925 		}
6926 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6927 			s->first_displayed_entry = next;
6928 			next = got_tree_entry_get_next(s->tree, next);
6929 		}
6930 	}
6931 
6932 	return NULL;
6933 }
6934 
6935 static const struct got_error *
6936 tree_entry_path(char **path, struct tog_parent_trees *parents,
6937     struct got_tree_entry *te)
6938 {
6939 	const struct got_error *err = NULL;
6940 	struct tog_parent_tree *pt;
6941 	size_t len = 2; /* for leading slash and NUL */
6942 
6943 	TAILQ_FOREACH(pt, parents, entry)
6944 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6945 		    + 1 /* slash */;
6946 	if (te)
6947 		len += strlen(got_tree_entry_get_name(te));
6948 
6949 	*path = calloc(1, len);
6950 	if (path == NULL)
6951 		return got_error_from_errno("calloc");
6952 
6953 	(*path)[0] = '/';
6954 	pt = TAILQ_LAST(parents, tog_parent_trees);
6955 	while (pt) {
6956 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6957 		if (strlcat(*path, name, len) >= len) {
6958 			err = got_error(GOT_ERR_NO_SPACE);
6959 			goto done;
6960 		}
6961 		if (strlcat(*path, "/", len) >= len) {
6962 			err = got_error(GOT_ERR_NO_SPACE);
6963 			goto done;
6964 		}
6965 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6966 	}
6967 	if (te) {
6968 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6969 			err = got_error(GOT_ERR_NO_SPACE);
6970 			goto done;
6971 		}
6972 	}
6973 done:
6974 	if (err) {
6975 		free(*path);
6976 		*path = NULL;
6977 	}
6978 	return err;
6979 }
6980 
6981 static const struct got_error *
6982 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6983     struct got_tree_entry *te, struct tog_parent_trees *parents,
6984     struct got_object_id *commit_id, struct got_repository *repo)
6985 {
6986 	const struct got_error *err = NULL;
6987 	char *path;
6988 	struct tog_view *blame_view;
6989 
6990 	*new_view = NULL;
6991 
6992 	err = tree_entry_path(&path, parents, te);
6993 	if (err)
6994 		return err;
6995 
6996 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6997 	if (blame_view == NULL) {
6998 		err = got_error_from_errno("view_open");
6999 		goto done;
7000 	}
7001 
7002 	err = open_blame_view(blame_view, path, commit_id, repo);
7003 	if (err) {
7004 		if (err->code == GOT_ERR_CANCELLED)
7005 			err = NULL;
7006 		view_close(blame_view);
7007 	} else
7008 		*new_view = blame_view;
7009 done:
7010 	free(path);
7011 	return err;
7012 }
7013 
7014 static const struct got_error *
7015 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7016     struct tog_tree_view_state *s)
7017 {
7018 	struct tog_view *log_view;
7019 	const struct got_error *err = NULL;
7020 	char *path;
7021 
7022 	*new_view = NULL;
7023 
7024 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7025 	if (log_view == NULL)
7026 		return got_error_from_errno("view_open");
7027 
7028 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7029 	if (err)
7030 		return err;
7031 
7032 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7033 	    path, 0);
7034 	if (err)
7035 		view_close(log_view);
7036 	else
7037 		*new_view = log_view;
7038 	free(path);
7039 	return err;
7040 }
7041 
7042 static const struct got_error *
7043 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7044     const char *head_ref_name, struct got_repository *repo)
7045 {
7046 	const struct got_error *err = NULL;
7047 	char *commit_id_str = NULL;
7048 	struct tog_tree_view_state *s = &view->state.tree;
7049 	struct got_commit_object *commit = NULL;
7050 
7051 	TAILQ_INIT(&s->parents);
7052 	STAILQ_INIT(&s->colors);
7053 
7054 	s->commit_id = got_object_id_dup(commit_id);
7055 	if (s->commit_id == NULL)
7056 		return got_error_from_errno("got_object_id_dup");
7057 
7058 	err = got_object_open_as_commit(&commit, repo, commit_id);
7059 	if (err)
7060 		goto done;
7061 
7062 	/*
7063 	 * The root is opened here and will be closed when the view is closed.
7064 	 * Any visited subtrees and their path-wise parents are opened and
7065 	 * closed on demand.
7066 	 */
7067 	err = got_object_open_as_tree(&s->root, repo,
7068 	    got_object_commit_get_tree_id(commit));
7069 	if (err)
7070 		goto done;
7071 	s->tree = s->root;
7072 
7073 	err = got_object_id_str(&commit_id_str, commit_id);
7074 	if (err != NULL)
7075 		goto done;
7076 
7077 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7078 		err = got_error_from_errno("asprintf");
7079 		goto done;
7080 	}
7081 
7082 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7083 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7084 	if (head_ref_name) {
7085 		s->head_ref_name = strdup(head_ref_name);
7086 		if (s->head_ref_name == NULL) {
7087 			err = got_error_from_errno("strdup");
7088 			goto done;
7089 		}
7090 	}
7091 	s->repo = repo;
7092 
7093 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7094 		err = add_color(&s->colors, "\\$$",
7095 		    TOG_COLOR_TREE_SUBMODULE,
7096 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7097 		if (err)
7098 			goto done;
7099 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7100 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7101 		if (err)
7102 			goto done;
7103 		err = add_color(&s->colors, "/$",
7104 		    TOG_COLOR_TREE_DIRECTORY,
7105 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7106 		if (err)
7107 			goto done;
7108 
7109 		err = add_color(&s->colors, "\\*$",
7110 		    TOG_COLOR_TREE_EXECUTABLE,
7111 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7112 		if (err)
7113 			goto done;
7114 
7115 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7116 		    get_color_value("TOG_COLOR_COMMIT"));
7117 		if (err)
7118 			goto done;
7119 	}
7120 
7121 	view->show = show_tree_view;
7122 	view->input = input_tree_view;
7123 	view->close = close_tree_view;
7124 	view->search_start = search_start_tree_view;
7125 	view->search_next = search_next_tree_view;
7126 done:
7127 	free(commit_id_str);
7128 	if (commit)
7129 		got_object_commit_close(commit);
7130 	if (err)
7131 		close_tree_view(view);
7132 	return err;
7133 }
7134 
7135 static const struct got_error *
7136 close_tree_view(struct tog_view *view)
7137 {
7138 	struct tog_tree_view_state *s = &view->state.tree;
7139 
7140 	free_colors(&s->colors);
7141 	free(s->tree_label);
7142 	s->tree_label = NULL;
7143 	free(s->commit_id);
7144 	s->commit_id = NULL;
7145 	free(s->head_ref_name);
7146 	s->head_ref_name = NULL;
7147 	while (!TAILQ_EMPTY(&s->parents)) {
7148 		struct tog_parent_tree *parent;
7149 		parent = TAILQ_FIRST(&s->parents);
7150 		TAILQ_REMOVE(&s->parents, parent, entry);
7151 		if (parent->tree != s->root)
7152 			got_object_tree_close(parent->tree);
7153 		free(parent);
7154 
7155 	}
7156 	if (s->tree != NULL && s->tree != s->root)
7157 		got_object_tree_close(s->tree);
7158 	if (s->root)
7159 		got_object_tree_close(s->root);
7160 	return NULL;
7161 }
7162 
7163 static const struct got_error *
7164 search_start_tree_view(struct tog_view *view)
7165 {
7166 	struct tog_tree_view_state *s = &view->state.tree;
7167 
7168 	s->matched_entry = NULL;
7169 	return NULL;
7170 }
7171 
7172 static int
7173 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7174 {
7175 	regmatch_t regmatch;
7176 
7177 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7178 	    0) == 0;
7179 }
7180 
7181 static const struct got_error *
7182 search_next_tree_view(struct tog_view *view)
7183 {
7184 	struct tog_tree_view_state *s = &view->state.tree;
7185 	struct got_tree_entry *te = NULL;
7186 
7187 	if (!view->searching) {
7188 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7189 		return NULL;
7190 	}
7191 
7192 	if (s->matched_entry) {
7193 		if (view->searching == TOG_SEARCH_FORWARD) {
7194 			if (s->selected_entry)
7195 				te = got_tree_entry_get_next(s->tree,
7196 				    s->selected_entry);
7197 			else
7198 				te = got_object_tree_get_first_entry(s->tree);
7199 		} else {
7200 			if (s->selected_entry == NULL)
7201 				te = got_object_tree_get_last_entry(s->tree);
7202 			else
7203 				te = got_tree_entry_get_prev(s->tree,
7204 				    s->selected_entry);
7205 		}
7206 	} else {
7207 		if (s->selected_entry)
7208 			te = s->selected_entry;
7209 		else if (view->searching == TOG_SEARCH_FORWARD)
7210 			te = got_object_tree_get_first_entry(s->tree);
7211 		else
7212 			te = got_object_tree_get_last_entry(s->tree);
7213 	}
7214 
7215 	while (1) {
7216 		if (te == NULL) {
7217 			if (s->matched_entry == NULL) {
7218 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7219 				return NULL;
7220 			}
7221 			if (view->searching == TOG_SEARCH_FORWARD)
7222 				te = got_object_tree_get_first_entry(s->tree);
7223 			else
7224 				te = got_object_tree_get_last_entry(s->tree);
7225 		}
7226 
7227 		if (match_tree_entry(te, &view->regex)) {
7228 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7229 			s->matched_entry = te;
7230 			break;
7231 		}
7232 
7233 		if (view->searching == TOG_SEARCH_FORWARD)
7234 			te = got_tree_entry_get_next(s->tree, te);
7235 		else
7236 			te = got_tree_entry_get_prev(s->tree, te);
7237 	}
7238 
7239 	if (s->matched_entry) {
7240 		s->first_displayed_entry = s->matched_entry;
7241 		s->selected = 0;
7242 	}
7243 
7244 	return NULL;
7245 }
7246 
7247 static const struct got_error *
7248 show_tree_view(struct tog_view *view)
7249 {
7250 	const struct got_error *err = NULL;
7251 	struct tog_tree_view_state *s = &view->state.tree;
7252 	char *parent_path;
7253 
7254 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7255 	if (err)
7256 		return err;
7257 
7258 	err = draw_tree_entries(view, parent_path);
7259 	free(parent_path);
7260 
7261 	view_border(view);
7262 	return err;
7263 }
7264 
7265 static const struct got_error *
7266 tree_goto_line(struct tog_view *view, int nlines)
7267 {
7268 	const struct got_error		 *err = NULL;
7269 	struct tog_tree_view_state	 *s = &view->state.tree;
7270 	struct got_tree_entry		**fte, **lte, **ste;
7271 	int				  g, last, first = 1, i = 1;
7272 	int				  root = s->tree == s->root;
7273 	int				  off = root ? 1 : 2;
7274 
7275 	g = view->gline;
7276 	view->gline = 0;
7277 
7278 	if (g == 0)
7279 		g = 1;
7280 	else if (g > got_object_tree_get_nentries(s->tree))
7281 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7282 
7283 	fte = &s->first_displayed_entry;
7284 	lte = &s->last_displayed_entry;
7285 	ste = &s->selected_entry;
7286 
7287 	if (*fte != NULL) {
7288 		first = got_tree_entry_get_index(*fte);
7289 		first += off;  /* account for ".." */
7290 	}
7291 	last = got_tree_entry_get_index(*lte);
7292 	last += off;
7293 
7294 	if (g >= first && g <= last && g - first < nlines) {
7295 		s->selected = g - first;
7296 		return NULL;	/* gline is on the current page */
7297 	}
7298 
7299 	if (*ste != NULL) {
7300 		i = got_tree_entry_get_index(*ste);
7301 		i += off;
7302 	}
7303 
7304 	if (i < g) {
7305 		err = tree_scroll_down(view, g - i);
7306 		if (err)
7307 			return err;
7308 		if (got_tree_entry_get_index(*lte) >=
7309 		    got_object_tree_get_nentries(s->tree) - 1 &&
7310 		    first + s->selected < g &&
7311 		    s->selected < s->ndisplayed - 1) {
7312 			first = got_tree_entry_get_index(*fte);
7313 			first += off;
7314 			s->selected = g - first;
7315 		}
7316 	} else if (i > g)
7317 		tree_scroll_up(s, i - g);
7318 
7319 	if (g < nlines &&
7320 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7321 		s->selected = g - 1;
7322 
7323 	return NULL;
7324 }
7325 
7326 static const struct got_error *
7327 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7328 {
7329 	const struct got_error *err = NULL;
7330 	struct tog_tree_view_state *s = &view->state.tree;
7331 	struct got_tree_entry *te;
7332 	int n, nscroll = view->nlines - 3;
7333 
7334 	if (view->gline)
7335 		return tree_goto_line(view, nscroll);
7336 
7337 	switch (ch) {
7338 	case 'i':
7339 		s->show_ids = !s->show_ids;
7340 		view->count = 0;
7341 		break;
7342 	case 'L':
7343 		view->count = 0;
7344 		if (!s->selected_entry)
7345 			break;
7346 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7347 		break;
7348 	case 'R':
7349 		view->count = 0;
7350 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7351 		break;
7352 	case 'g':
7353 	case KEY_HOME:
7354 		s->selected = 0;
7355 		view->count = 0;
7356 		if (s->tree == s->root)
7357 			s->first_displayed_entry =
7358 			    got_object_tree_get_first_entry(s->tree);
7359 		else
7360 			s->first_displayed_entry = NULL;
7361 		break;
7362 	case 'G':
7363 	case KEY_END: {
7364 		int eos = view->nlines - 3;
7365 
7366 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7367 			--eos;  /* border */
7368 		s->selected = 0;
7369 		view->count = 0;
7370 		te = got_object_tree_get_last_entry(s->tree);
7371 		for (n = 0; n < eos; n++) {
7372 			if (te == NULL) {
7373 				if (s->tree != s->root) {
7374 					s->first_displayed_entry = NULL;
7375 					n++;
7376 				}
7377 				break;
7378 			}
7379 			s->first_displayed_entry = te;
7380 			te = got_tree_entry_get_prev(s->tree, te);
7381 		}
7382 		if (n > 0)
7383 			s->selected = n - 1;
7384 		break;
7385 	}
7386 	case 'k':
7387 	case KEY_UP:
7388 	case CTRL('p'):
7389 		if (s->selected > 0) {
7390 			s->selected--;
7391 			break;
7392 		}
7393 		tree_scroll_up(s, 1);
7394 		if (s->selected_entry == NULL ||
7395 		    (s->tree == s->root && s->selected_entry ==
7396 		     got_object_tree_get_first_entry(s->tree)))
7397 			view->count = 0;
7398 		break;
7399 	case CTRL('u'):
7400 	case 'u':
7401 		nscroll /= 2;
7402 		/* FALL THROUGH */
7403 	case KEY_PPAGE:
7404 	case CTRL('b'):
7405 	case 'b':
7406 		if (s->tree == s->root) {
7407 			if (got_object_tree_get_first_entry(s->tree) ==
7408 			    s->first_displayed_entry)
7409 				s->selected -= MIN(s->selected, nscroll);
7410 		} else {
7411 			if (s->first_displayed_entry == NULL)
7412 				s->selected -= MIN(s->selected, nscroll);
7413 		}
7414 		tree_scroll_up(s, MAX(0, nscroll));
7415 		if (s->selected_entry == NULL ||
7416 		    (s->tree == s->root && s->selected_entry ==
7417 		     got_object_tree_get_first_entry(s->tree)))
7418 			view->count = 0;
7419 		break;
7420 	case 'j':
7421 	case KEY_DOWN:
7422 	case CTRL('n'):
7423 		if (s->selected < s->ndisplayed - 1) {
7424 			s->selected++;
7425 			break;
7426 		}
7427 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7428 		    == NULL) {
7429 			/* can't scroll any further */
7430 			view->count = 0;
7431 			break;
7432 		}
7433 		tree_scroll_down(view, 1);
7434 		break;
7435 	case CTRL('d'):
7436 	case 'd':
7437 		nscroll /= 2;
7438 		/* FALL THROUGH */
7439 	case KEY_NPAGE:
7440 	case CTRL('f'):
7441 	case 'f':
7442 	case ' ':
7443 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7444 		    == NULL) {
7445 			/* can't scroll any further; move cursor down */
7446 			if (s->selected < s->ndisplayed - 1)
7447 				s->selected += MIN(nscroll,
7448 				    s->ndisplayed - s->selected - 1);
7449 			else
7450 				view->count = 0;
7451 			break;
7452 		}
7453 		tree_scroll_down(view, nscroll);
7454 		break;
7455 	case KEY_ENTER:
7456 	case '\r':
7457 	case KEY_BACKSPACE:
7458 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7459 			struct tog_parent_tree *parent;
7460 			/* user selected '..' */
7461 			if (s->tree == s->root) {
7462 				view->count = 0;
7463 				break;
7464 			}
7465 			parent = TAILQ_FIRST(&s->parents);
7466 			TAILQ_REMOVE(&s->parents, parent,
7467 			    entry);
7468 			got_object_tree_close(s->tree);
7469 			s->tree = parent->tree;
7470 			s->first_displayed_entry =
7471 			    parent->first_displayed_entry;
7472 			s->selected_entry =
7473 			    parent->selected_entry;
7474 			s->selected = parent->selected;
7475 			if (s->selected > view->nlines - 3) {
7476 				err = offset_selection_down(view);
7477 				if (err)
7478 					break;
7479 			}
7480 			free(parent);
7481 		} else if (S_ISDIR(got_tree_entry_get_mode(
7482 		    s->selected_entry))) {
7483 			struct got_tree_object *subtree;
7484 			view->count = 0;
7485 			err = got_object_open_as_tree(&subtree, s->repo,
7486 			    got_tree_entry_get_id(s->selected_entry));
7487 			if (err)
7488 				break;
7489 			err = tree_view_visit_subtree(s, subtree);
7490 			if (err) {
7491 				got_object_tree_close(subtree);
7492 				break;
7493 			}
7494 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7495 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7496 		break;
7497 	case KEY_RESIZE:
7498 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7499 			s->selected = view->nlines - 4;
7500 		view->count = 0;
7501 		break;
7502 	default:
7503 		view->count = 0;
7504 		break;
7505 	}
7506 
7507 	return err;
7508 }
7509 
7510 __dead static void
7511 usage_tree(void)
7512 {
7513 	endwin();
7514 	fprintf(stderr,
7515 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7516 	    getprogname());
7517 	exit(1);
7518 }
7519 
7520 static const struct got_error *
7521 cmd_tree(int argc, char *argv[])
7522 {
7523 	const struct got_error *error;
7524 	struct got_repository *repo = NULL;
7525 	struct got_worktree *worktree = NULL;
7526 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7527 	struct got_object_id *commit_id = NULL;
7528 	struct got_commit_object *commit = NULL;
7529 	const char *commit_id_arg = NULL;
7530 	char *label = NULL;
7531 	struct got_reference *ref = NULL;
7532 	const char *head_ref_name = NULL;
7533 	int ch;
7534 	struct tog_view *view;
7535 	int *pack_fds = NULL;
7536 
7537 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7538 		switch (ch) {
7539 		case 'c':
7540 			commit_id_arg = optarg;
7541 			break;
7542 		case 'r':
7543 			repo_path = realpath(optarg, NULL);
7544 			if (repo_path == NULL)
7545 				return got_error_from_errno2("realpath",
7546 				    optarg);
7547 			break;
7548 		default:
7549 			usage_tree();
7550 			/* NOTREACHED */
7551 		}
7552 	}
7553 
7554 	argc -= optind;
7555 	argv += optind;
7556 
7557 	if (argc > 1)
7558 		usage_tree();
7559 
7560 	error = got_repo_pack_fds_open(&pack_fds);
7561 	if (error != NULL)
7562 		goto done;
7563 
7564 	if (repo_path == NULL) {
7565 		cwd = getcwd(NULL, 0);
7566 		if (cwd == NULL)
7567 			return got_error_from_errno("getcwd");
7568 		error = got_worktree_open(&worktree, cwd);
7569 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7570 			goto done;
7571 		if (worktree)
7572 			repo_path =
7573 			    strdup(got_worktree_get_repo_path(worktree));
7574 		else
7575 			repo_path = strdup(cwd);
7576 		if (repo_path == NULL) {
7577 			error = got_error_from_errno("strdup");
7578 			goto done;
7579 		}
7580 	}
7581 
7582 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7583 	if (error != NULL)
7584 		goto done;
7585 
7586 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7587 	    repo, worktree);
7588 	if (error)
7589 		goto done;
7590 
7591 	init_curses();
7592 
7593 	error = apply_unveil(got_repo_get_path(repo), NULL);
7594 	if (error)
7595 		goto done;
7596 
7597 	error = tog_load_refs(repo, 0);
7598 	if (error)
7599 		goto done;
7600 
7601 	if (commit_id_arg == NULL) {
7602 		error = got_repo_match_object_id(&commit_id, &label,
7603 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7604 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7605 		if (error)
7606 			goto done;
7607 		head_ref_name = label;
7608 	} else {
7609 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7610 		if (error == NULL)
7611 			head_ref_name = got_ref_get_name(ref);
7612 		else if (error->code != GOT_ERR_NOT_REF)
7613 			goto done;
7614 		error = got_repo_match_object_id(&commit_id, NULL,
7615 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7616 		if (error)
7617 			goto done;
7618 	}
7619 
7620 	error = got_object_open_as_commit(&commit, repo, commit_id);
7621 	if (error)
7622 		goto done;
7623 
7624 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7625 	if (view == NULL) {
7626 		error = got_error_from_errno("view_open");
7627 		goto done;
7628 	}
7629 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7630 	if (error)
7631 		goto done;
7632 	if (!got_path_is_root_dir(in_repo_path)) {
7633 		error = tree_view_walk_path(&view->state.tree, commit,
7634 		    in_repo_path);
7635 		if (error)
7636 			goto done;
7637 	}
7638 
7639 	if (worktree) {
7640 		/* Release work tree lock. */
7641 		got_worktree_close(worktree);
7642 		worktree = NULL;
7643 	}
7644 	error = view_loop(view);
7645 done:
7646 	free(repo_path);
7647 	free(cwd);
7648 	free(commit_id);
7649 	free(label);
7650 	if (ref)
7651 		got_ref_close(ref);
7652 	if (repo) {
7653 		const struct got_error *close_err = got_repo_close(repo);
7654 		if (error == NULL)
7655 			error = close_err;
7656 	}
7657 	if (pack_fds) {
7658 		const struct got_error *pack_err =
7659 		    got_repo_pack_fds_close(pack_fds);
7660 		if (error == NULL)
7661 			error = pack_err;
7662 	}
7663 	tog_free_refs();
7664 	return error;
7665 }
7666 
7667 static const struct got_error *
7668 ref_view_load_refs(struct tog_ref_view_state *s)
7669 {
7670 	struct got_reflist_entry *sre;
7671 	struct tog_reflist_entry *re;
7672 
7673 	s->nrefs = 0;
7674 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7675 		if (strncmp(got_ref_get_name(sre->ref),
7676 		    "refs/got/", 9) == 0 &&
7677 		    strncmp(got_ref_get_name(sre->ref),
7678 		    "refs/got/backup/", 16) != 0)
7679 			continue;
7680 
7681 		re = malloc(sizeof(*re));
7682 		if (re == NULL)
7683 			return got_error_from_errno("malloc");
7684 
7685 		re->ref = got_ref_dup(sre->ref);
7686 		if (re->ref == NULL)
7687 			return got_error_from_errno("got_ref_dup");
7688 		re->idx = s->nrefs++;
7689 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7690 	}
7691 
7692 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7693 	return NULL;
7694 }
7695 
7696 static void
7697 ref_view_free_refs(struct tog_ref_view_state *s)
7698 {
7699 	struct tog_reflist_entry *re;
7700 
7701 	while (!TAILQ_EMPTY(&s->refs)) {
7702 		re = TAILQ_FIRST(&s->refs);
7703 		TAILQ_REMOVE(&s->refs, re, entry);
7704 		got_ref_close(re->ref);
7705 		free(re);
7706 	}
7707 }
7708 
7709 static const struct got_error *
7710 open_ref_view(struct tog_view *view, struct got_repository *repo)
7711 {
7712 	const struct got_error *err = NULL;
7713 	struct tog_ref_view_state *s = &view->state.ref;
7714 
7715 	s->selected_entry = 0;
7716 	s->repo = repo;
7717 
7718 	TAILQ_INIT(&s->refs);
7719 	STAILQ_INIT(&s->colors);
7720 
7721 	err = ref_view_load_refs(s);
7722 	if (err)
7723 		return err;
7724 
7725 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7726 		err = add_color(&s->colors, "^refs/heads/",
7727 		    TOG_COLOR_REFS_HEADS,
7728 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7729 		if (err)
7730 			goto done;
7731 
7732 		err = add_color(&s->colors, "^refs/tags/",
7733 		    TOG_COLOR_REFS_TAGS,
7734 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7735 		if (err)
7736 			goto done;
7737 
7738 		err = add_color(&s->colors, "^refs/remotes/",
7739 		    TOG_COLOR_REFS_REMOTES,
7740 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7741 		if (err)
7742 			goto done;
7743 
7744 		err = add_color(&s->colors, "^refs/got/backup/",
7745 		    TOG_COLOR_REFS_BACKUP,
7746 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7747 		if (err)
7748 			goto done;
7749 	}
7750 
7751 	view->show = show_ref_view;
7752 	view->input = input_ref_view;
7753 	view->close = close_ref_view;
7754 	view->search_start = search_start_ref_view;
7755 	view->search_next = search_next_ref_view;
7756 done:
7757 	if (err)
7758 		free_colors(&s->colors);
7759 	return err;
7760 }
7761 
7762 static const struct got_error *
7763 close_ref_view(struct tog_view *view)
7764 {
7765 	struct tog_ref_view_state *s = &view->state.ref;
7766 
7767 	ref_view_free_refs(s);
7768 	free_colors(&s->colors);
7769 
7770 	return NULL;
7771 }
7772 
7773 static const struct got_error *
7774 resolve_reflist_entry(struct got_object_id **commit_id,
7775     struct tog_reflist_entry *re, struct got_repository *repo)
7776 {
7777 	const struct got_error *err = NULL;
7778 	struct got_object_id *obj_id;
7779 	struct got_tag_object *tag = NULL;
7780 	int obj_type;
7781 
7782 	*commit_id = NULL;
7783 
7784 	err = got_ref_resolve(&obj_id, repo, re->ref);
7785 	if (err)
7786 		return err;
7787 
7788 	err = got_object_get_type(&obj_type, repo, obj_id);
7789 	if (err)
7790 		goto done;
7791 
7792 	switch (obj_type) {
7793 	case GOT_OBJ_TYPE_COMMIT:
7794 		*commit_id = obj_id;
7795 		break;
7796 	case GOT_OBJ_TYPE_TAG:
7797 		err = got_object_open_as_tag(&tag, repo, obj_id);
7798 		if (err)
7799 			goto done;
7800 		free(obj_id);
7801 		err = got_object_get_type(&obj_type, repo,
7802 		    got_object_tag_get_object_id(tag));
7803 		if (err)
7804 			goto done;
7805 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7806 			err = got_error(GOT_ERR_OBJ_TYPE);
7807 			goto done;
7808 		}
7809 		*commit_id = got_object_id_dup(
7810 		    got_object_tag_get_object_id(tag));
7811 		if (*commit_id == NULL) {
7812 			err = got_error_from_errno("got_object_id_dup");
7813 			goto done;
7814 		}
7815 		break;
7816 	default:
7817 		err = got_error(GOT_ERR_OBJ_TYPE);
7818 		break;
7819 	}
7820 
7821 done:
7822 	if (tag)
7823 		got_object_tag_close(tag);
7824 	if (err) {
7825 		free(*commit_id);
7826 		*commit_id = NULL;
7827 	}
7828 	return err;
7829 }
7830 
7831 static const struct got_error *
7832 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7833     struct tog_reflist_entry *re, struct got_repository *repo)
7834 {
7835 	struct tog_view *log_view;
7836 	const struct got_error *err = NULL;
7837 	struct got_object_id *commit_id = NULL;
7838 
7839 	*new_view = NULL;
7840 
7841 	err = resolve_reflist_entry(&commit_id, re, repo);
7842 	if (err) {
7843 		if (err->code != GOT_ERR_OBJ_TYPE)
7844 			return err;
7845 		else
7846 			return NULL;
7847 	}
7848 
7849 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7850 	if (log_view == NULL) {
7851 		err = got_error_from_errno("view_open");
7852 		goto done;
7853 	}
7854 
7855 	err = open_log_view(log_view, commit_id, repo,
7856 	    got_ref_get_name(re->ref), "", 0);
7857 done:
7858 	if (err)
7859 		view_close(log_view);
7860 	else
7861 		*new_view = log_view;
7862 	free(commit_id);
7863 	return err;
7864 }
7865 
7866 static void
7867 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7868 {
7869 	struct tog_reflist_entry *re;
7870 	int i = 0;
7871 
7872 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7873 		return;
7874 
7875 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7876 	while (i++ < maxscroll) {
7877 		if (re == NULL)
7878 			break;
7879 		s->first_displayed_entry = re;
7880 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7881 	}
7882 }
7883 
7884 static const struct got_error *
7885 ref_scroll_down(struct tog_view *view, int maxscroll)
7886 {
7887 	struct tog_ref_view_state *s = &view->state.ref;
7888 	struct tog_reflist_entry *next, *last;
7889 	int n = 0;
7890 
7891 	if (s->first_displayed_entry)
7892 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7893 	else
7894 		next = TAILQ_FIRST(&s->refs);
7895 
7896 	last = s->last_displayed_entry;
7897 	while (next && n++ < maxscroll) {
7898 		if (last) {
7899 			s->last_displayed_entry = last;
7900 			last = TAILQ_NEXT(last, entry);
7901 		}
7902 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7903 			s->first_displayed_entry = next;
7904 			next = TAILQ_NEXT(next, entry);
7905 		}
7906 	}
7907 
7908 	return NULL;
7909 }
7910 
7911 static const struct got_error *
7912 search_start_ref_view(struct tog_view *view)
7913 {
7914 	struct tog_ref_view_state *s = &view->state.ref;
7915 
7916 	s->matched_entry = NULL;
7917 	return NULL;
7918 }
7919 
7920 static int
7921 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7922 {
7923 	regmatch_t regmatch;
7924 
7925 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7926 	    0) == 0;
7927 }
7928 
7929 static const struct got_error *
7930 search_next_ref_view(struct tog_view *view)
7931 {
7932 	struct tog_ref_view_state *s = &view->state.ref;
7933 	struct tog_reflist_entry *re = NULL;
7934 
7935 	if (!view->searching) {
7936 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7937 		return NULL;
7938 	}
7939 
7940 	if (s->matched_entry) {
7941 		if (view->searching == TOG_SEARCH_FORWARD) {
7942 			if (s->selected_entry)
7943 				re = TAILQ_NEXT(s->selected_entry, entry);
7944 			else
7945 				re = TAILQ_PREV(s->selected_entry,
7946 				    tog_reflist_head, entry);
7947 		} else {
7948 			if (s->selected_entry == NULL)
7949 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7950 			else
7951 				re = TAILQ_PREV(s->selected_entry,
7952 				    tog_reflist_head, entry);
7953 		}
7954 	} else {
7955 		if (s->selected_entry)
7956 			re = s->selected_entry;
7957 		else if (view->searching == TOG_SEARCH_FORWARD)
7958 			re = TAILQ_FIRST(&s->refs);
7959 		else
7960 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7961 	}
7962 
7963 	while (1) {
7964 		if (re == NULL) {
7965 			if (s->matched_entry == NULL) {
7966 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7967 				return NULL;
7968 			}
7969 			if (view->searching == TOG_SEARCH_FORWARD)
7970 				re = TAILQ_FIRST(&s->refs);
7971 			else
7972 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7973 		}
7974 
7975 		if (match_reflist_entry(re, &view->regex)) {
7976 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7977 			s->matched_entry = re;
7978 			break;
7979 		}
7980 
7981 		if (view->searching == TOG_SEARCH_FORWARD)
7982 			re = TAILQ_NEXT(re, entry);
7983 		else
7984 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7985 	}
7986 
7987 	if (s->matched_entry) {
7988 		s->first_displayed_entry = s->matched_entry;
7989 		s->selected = 0;
7990 	}
7991 
7992 	return NULL;
7993 }
7994 
7995 static const struct got_error *
7996 show_ref_view(struct tog_view *view)
7997 {
7998 	const struct got_error *err = NULL;
7999 	struct tog_ref_view_state *s = &view->state.ref;
8000 	struct tog_reflist_entry *re;
8001 	char *line = NULL;
8002 	wchar_t *wline;
8003 	struct tog_color *tc;
8004 	int width, n;
8005 	int limit = view->nlines;
8006 
8007 	werase(view->window);
8008 
8009 	s->ndisplayed = 0;
8010 	if (view_is_hsplit_top(view))
8011 		--limit;  /* border */
8012 
8013 	if (limit == 0)
8014 		return NULL;
8015 
8016 	re = s->first_displayed_entry;
8017 
8018 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8019 	    s->nrefs) == -1)
8020 		return got_error_from_errno("asprintf");
8021 
8022 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8023 	if (err) {
8024 		free(line);
8025 		return err;
8026 	}
8027 	if (view_needs_focus_indication(view))
8028 		wstandout(view->window);
8029 	waddwstr(view->window, wline);
8030 	while (width++ < view->ncols)
8031 		waddch(view->window, ' ');
8032 	if (view_needs_focus_indication(view))
8033 		wstandend(view->window);
8034 	free(wline);
8035 	wline = NULL;
8036 	free(line);
8037 	line = NULL;
8038 	if (--limit <= 0)
8039 		return NULL;
8040 
8041 	n = 0;
8042 	while (re && limit > 0) {
8043 		char *line = NULL;
8044 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8045 
8046 		if (s->show_date) {
8047 			struct got_commit_object *ci;
8048 			struct got_tag_object *tag;
8049 			struct got_object_id *id;
8050 			struct tm tm;
8051 			time_t t;
8052 
8053 			err = got_ref_resolve(&id, s->repo, re->ref);
8054 			if (err)
8055 				return err;
8056 			err = got_object_open_as_tag(&tag, s->repo, id);
8057 			if (err) {
8058 				if (err->code != GOT_ERR_OBJ_TYPE) {
8059 					free(id);
8060 					return err;
8061 				}
8062 				err = got_object_open_as_commit(&ci, s->repo,
8063 				    id);
8064 				if (err) {
8065 					free(id);
8066 					return err;
8067 				}
8068 				t = got_object_commit_get_committer_time(ci);
8069 				got_object_commit_close(ci);
8070 			} else {
8071 				t = got_object_tag_get_tagger_time(tag);
8072 				got_object_tag_close(tag);
8073 			}
8074 			free(id);
8075 			if (gmtime_r(&t, &tm) == NULL)
8076 				return got_error_from_errno("gmtime_r");
8077 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8078 				return got_error(GOT_ERR_NO_SPACE);
8079 		}
8080 		if (got_ref_is_symbolic(re->ref)) {
8081 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8082 			    ymd : "", got_ref_get_name(re->ref),
8083 			    got_ref_get_symref_target(re->ref)) == -1)
8084 				return got_error_from_errno("asprintf");
8085 		} else if (s->show_ids) {
8086 			struct got_object_id *id;
8087 			char *id_str;
8088 			err = got_ref_resolve(&id, s->repo, re->ref);
8089 			if (err)
8090 				return err;
8091 			err = got_object_id_str(&id_str, id);
8092 			if (err) {
8093 				free(id);
8094 				return err;
8095 			}
8096 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8097 			    got_ref_get_name(re->ref), id_str) == -1) {
8098 				err = got_error_from_errno("asprintf");
8099 				free(id);
8100 				free(id_str);
8101 				return err;
8102 			}
8103 			free(id);
8104 			free(id_str);
8105 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8106 		    got_ref_get_name(re->ref)) == -1)
8107 			return got_error_from_errno("asprintf");
8108 
8109 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8110 		    0, 0);
8111 		if (err) {
8112 			free(line);
8113 			return err;
8114 		}
8115 		if (n == s->selected) {
8116 			if (view->focussed)
8117 				wstandout(view->window);
8118 			s->selected_entry = re;
8119 		}
8120 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8121 		if (tc)
8122 			wattr_on(view->window,
8123 			    COLOR_PAIR(tc->colorpair), NULL);
8124 		waddwstr(view->window, wline);
8125 		if (tc)
8126 			wattr_off(view->window,
8127 			    COLOR_PAIR(tc->colorpair), NULL);
8128 		if (width < view->ncols - 1)
8129 			waddch(view->window, '\n');
8130 		if (n == s->selected && view->focussed)
8131 			wstandend(view->window);
8132 		free(line);
8133 		free(wline);
8134 		wline = NULL;
8135 		n++;
8136 		s->ndisplayed++;
8137 		s->last_displayed_entry = re;
8138 
8139 		limit--;
8140 		re = TAILQ_NEXT(re, entry);
8141 	}
8142 
8143 	view_border(view);
8144 	return err;
8145 }
8146 
8147 static const struct got_error *
8148 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8149     struct tog_reflist_entry *re, struct got_repository *repo)
8150 {
8151 	const struct got_error *err = NULL;
8152 	struct got_object_id *commit_id = NULL;
8153 	struct tog_view *tree_view;
8154 
8155 	*new_view = NULL;
8156 
8157 	err = resolve_reflist_entry(&commit_id, re, repo);
8158 	if (err) {
8159 		if (err->code != GOT_ERR_OBJ_TYPE)
8160 			return err;
8161 		else
8162 			return NULL;
8163 	}
8164 
8165 
8166 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8167 	if (tree_view == NULL) {
8168 		err = got_error_from_errno("view_open");
8169 		goto done;
8170 	}
8171 
8172 	err = open_tree_view(tree_view, commit_id,
8173 	    got_ref_get_name(re->ref), repo);
8174 	if (err)
8175 		goto done;
8176 
8177 	*new_view = tree_view;
8178 done:
8179 	free(commit_id);
8180 	return err;
8181 }
8182 
8183 static const struct got_error *
8184 ref_goto_line(struct tog_view *view, int nlines)
8185 {
8186 	const struct got_error		*err = NULL;
8187 	struct tog_ref_view_state	*s = &view->state.ref;
8188 	int				 g, idx = s->selected_entry->idx;
8189 
8190 	g = view->gline;
8191 	view->gline = 0;
8192 
8193 	if (g == 0)
8194 		g = 1;
8195 	else if (g > s->nrefs)
8196 		g = s->nrefs;
8197 
8198 	if (g >= s->first_displayed_entry->idx + 1 &&
8199 	    g <= s->last_displayed_entry->idx + 1 &&
8200 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8201 		s->selected = g - s->first_displayed_entry->idx - 1;
8202 		return NULL;
8203 	}
8204 
8205 	if (idx + 1 < g) {
8206 		err = ref_scroll_down(view, g - idx - 1);
8207 		if (err)
8208 			return err;
8209 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8210 		    s->first_displayed_entry->idx + s->selected < g &&
8211 		    s->selected < s->ndisplayed - 1)
8212 			s->selected = g - s->first_displayed_entry->idx - 1;
8213 	} else if (idx + 1 > g)
8214 		ref_scroll_up(s, idx - g + 1);
8215 
8216 	if (g < nlines && s->first_displayed_entry->idx == 0)
8217 		s->selected = g - 1;
8218 
8219 	return NULL;
8220 
8221 }
8222 
8223 static const struct got_error *
8224 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8225 {
8226 	const struct got_error *err = NULL;
8227 	struct tog_ref_view_state *s = &view->state.ref;
8228 	struct tog_reflist_entry *re;
8229 	int n, nscroll = view->nlines - 1;
8230 
8231 	if (view->gline)
8232 		return ref_goto_line(view, nscroll);
8233 
8234 	switch (ch) {
8235 	case 'i':
8236 		s->show_ids = !s->show_ids;
8237 		view->count = 0;
8238 		break;
8239 	case 'm':
8240 		s->show_date = !s->show_date;
8241 		view->count = 0;
8242 		break;
8243 	case 'o':
8244 		s->sort_by_date = !s->sort_by_date;
8245 		view->count = 0;
8246 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8247 		    got_ref_cmp_by_commit_timestamp_descending :
8248 		    tog_ref_cmp_by_name, s->repo);
8249 		if (err)
8250 			break;
8251 		got_reflist_object_id_map_free(tog_refs_idmap);
8252 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8253 		    &tog_refs, s->repo);
8254 		if (err)
8255 			break;
8256 		ref_view_free_refs(s);
8257 		err = ref_view_load_refs(s);
8258 		break;
8259 	case KEY_ENTER:
8260 	case '\r':
8261 		view->count = 0;
8262 		if (!s->selected_entry)
8263 			break;
8264 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8265 		break;
8266 	case 'T':
8267 		view->count = 0;
8268 		if (!s->selected_entry)
8269 			break;
8270 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8271 		break;
8272 	case 'g':
8273 	case KEY_HOME:
8274 		s->selected = 0;
8275 		view->count = 0;
8276 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8277 		break;
8278 	case 'G':
8279 	case KEY_END: {
8280 		int eos = view->nlines - 1;
8281 
8282 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8283 			--eos;  /* border */
8284 		s->selected = 0;
8285 		view->count = 0;
8286 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8287 		for (n = 0; n < eos; n++) {
8288 			if (re == NULL)
8289 				break;
8290 			s->first_displayed_entry = re;
8291 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8292 		}
8293 		if (n > 0)
8294 			s->selected = n - 1;
8295 		break;
8296 	}
8297 	case 'k':
8298 	case KEY_UP:
8299 	case CTRL('p'):
8300 		if (s->selected > 0) {
8301 			s->selected--;
8302 			break;
8303 		}
8304 		ref_scroll_up(s, 1);
8305 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8306 			view->count = 0;
8307 		break;
8308 	case CTRL('u'):
8309 	case 'u':
8310 		nscroll /= 2;
8311 		/* FALL THROUGH */
8312 	case KEY_PPAGE:
8313 	case CTRL('b'):
8314 	case 'b':
8315 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8316 			s->selected -= MIN(nscroll, s->selected);
8317 		ref_scroll_up(s, MAX(0, nscroll));
8318 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8319 			view->count = 0;
8320 		break;
8321 	case 'j':
8322 	case KEY_DOWN:
8323 	case CTRL('n'):
8324 		if (s->selected < s->ndisplayed - 1) {
8325 			s->selected++;
8326 			break;
8327 		}
8328 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8329 			/* can't scroll any further */
8330 			view->count = 0;
8331 			break;
8332 		}
8333 		ref_scroll_down(view, 1);
8334 		break;
8335 	case CTRL('d'):
8336 	case 'd':
8337 		nscroll /= 2;
8338 		/* FALL THROUGH */
8339 	case KEY_NPAGE:
8340 	case CTRL('f'):
8341 	case 'f':
8342 	case ' ':
8343 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8344 			/* can't scroll any further; move cursor down */
8345 			if (s->selected < s->ndisplayed - 1)
8346 				s->selected += MIN(nscroll,
8347 				    s->ndisplayed - s->selected - 1);
8348 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8349 				s->selected += s->ndisplayed - s->selected - 1;
8350 			view->count = 0;
8351 			break;
8352 		}
8353 		ref_scroll_down(view, nscroll);
8354 		break;
8355 	case CTRL('l'):
8356 		view->count = 0;
8357 		tog_free_refs();
8358 		err = tog_load_refs(s->repo, s->sort_by_date);
8359 		if (err)
8360 			break;
8361 		ref_view_free_refs(s);
8362 		err = ref_view_load_refs(s);
8363 		break;
8364 	case KEY_RESIZE:
8365 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8366 			s->selected = view->nlines - 2;
8367 		break;
8368 	default:
8369 		view->count = 0;
8370 		break;
8371 	}
8372 
8373 	return err;
8374 }
8375 
8376 __dead static void
8377 usage_ref(void)
8378 {
8379 	endwin();
8380 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8381 	    getprogname());
8382 	exit(1);
8383 }
8384 
8385 static const struct got_error *
8386 cmd_ref(int argc, char *argv[])
8387 {
8388 	const struct got_error *error;
8389 	struct got_repository *repo = NULL;
8390 	struct got_worktree *worktree = NULL;
8391 	char *cwd = NULL, *repo_path = NULL;
8392 	int ch;
8393 	struct tog_view *view;
8394 	int *pack_fds = NULL;
8395 
8396 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8397 		switch (ch) {
8398 		case 'r':
8399 			repo_path = realpath(optarg, NULL);
8400 			if (repo_path == NULL)
8401 				return got_error_from_errno2("realpath",
8402 				    optarg);
8403 			break;
8404 		default:
8405 			usage_ref();
8406 			/* NOTREACHED */
8407 		}
8408 	}
8409 
8410 	argc -= optind;
8411 	argv += optind;
8412 
8413 	if (argc > 1)
8414 		usage_ref();
8415 
8416 	error = got_repo_pack_fds_open(&pack_fds);
8417 	if (error != NULL)
8418 		goto done;
8419 
8420 	if (repo_path == NULL) {
8421 		cwd = getcwd(NULL, 0);
8422 		if (cwd == NULL)
8423 			return got_error_from_errno("getcwd");
8424 		error = got_worktree_open(&worktree, cwd);
8425 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8426 			goto done;
8427 		if (worktree)
8428 			repo_path =
8429 			    strdup(got_worktree_get_repo_path(worktree));
8430 		else
8431 			repo_path = strdup(cwd);
8432 		if (repo_path == NULL) {
8433 			error = got_error_from_errno("strdup");
8434 			goto done;
8435 		}
8436 	}
8437 
8438 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8439 	if (error != NULL)
8440 		goto done;
8441 
8442 	init_curses();
8443 
8444 	error = apply_unveil(got_repo_get_path(repo), NULL);
8445 	if (error)
8446 		goto done;
8447 
8448 	error = tog_load_refs(repo, 0);
8449 	if (error)
8450 		goto done;
8451 
8452 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8453 	if (view == NULL) {
8454 		error = got_error_from_errno("view_open");
8455 		goto done;
8456 	}
8457 
8458 	error = open_ref_view(view, repo);
8459 	if (error)
8460 		goto done;
8461 
8462 	if (worktree) {
8463 		/* Release work tree lock. */
8464 		got_worktree_close(worktree);
8465 		worktree = NULL;
8466 	}
8467 	error = view_loop(view);
8468 done:
8469 	free(repo_path);
8470 	free(cwd);
8471 	if (repo) {
8472 		const struct got_error *close_err = got_repo_close(repo);
8473 		if (close_err)
8474 			error = close_err;
8475 	}
8476 	if (pack_fds) {
8477 		const struct got_error *pack_err =
8478 		    got_repo_pack_fds_close(pack_fds);
8479 		if (error == NULL)
8480 			error = pack_err;
8481 	}
8482 	tog_free_refs();
8483 	return error;
8484 }
8485 
8486 static const struct got_error*
8487 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8488     const char *str)
8489 {
8490 	size_t len;
8491 
8492 	if (win == NULL)
8493 		win = stdscr;
8494 
8495 	len = strlen(str);
8496 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8497 
8498 	if (focus)
8499 		wstandout(win);
8500 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8501 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8502 	if (focus)
8503 		wstandend(win);
8504 
8505 	return NULL;
8506 }
8507 
8508 static const struct got_error *
8509 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8510 {
8511 	off_t *p;
8512 
8513 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8514 	if (p == NULL) {
8515 		free(*line_offsets);
8516 		*line_offsets = NULL;
8517 		return got_error_from_errno("reallocarray");
8518 	}
8519 
8520 	*line_offsets = p;
8521 	(*line_offsets)[*nlines] = off;
8522 	++(*nlines);
8523 	return NULL;
8524 }
8525 
8526 static const struct got_error *
8527 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8528 {
8529 	*ret = 0;
8530 
8531 	for (;n > 0; --n, ++km) {
8532 		char	*t0, *t, *k;
8533 		size_t	 len = 1;
8534 
8535 		if (km->keys == NULL)
8536 			continue;
8537 
8538 		t = t0 = strdup(km->keys);
8539 		if (t0 == NULL)
8540 			return got_error_from_errno("strdup");
8541 
8542 		len += strlen(t);
8543 		while ((k = strsep(&t, " ")) != NULL)
8544 			len += strlen(k) > 1 ? 2 : 0;
8545 		free(t0);
8546 		*ret = MAX(*ret, len);
8547 	}
8548 
8549 	return NULL;
8550 }
8551 
8552 /*
8553  * Write keymap section headers, keys, and key info in km to f.
8554  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8555  * wrap control and symbolic keys in guillemets, else use <>.
8556  */
8557 static const struct got_error *
8558 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8559 {
8560 	int n, len = width;
8561 
8562 	if (km->keys) {
8563 		static const char *u8_glyph[] = {
8564 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8565 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8566 		};
8567 		char	*t0, *t, *k;
8568 		int	 cs, s, first = 1;
8569 
8570 		cs = got_locale_is_utf8();
8571 
8572 		t = t0 = strdup(km->keys);
8573 		if (t0 == NULL)
8574 			return got_error_from_errno("strdup");
8575 
8576 		len = strlen(km->keys);
8577 		while ((k = strsep(&t, " ")) != NULL) {
8578 			s = strlen(k) > 1;  /* control or symbolic key */
8579 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8580 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8581 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8582 			if (n < 0) {
8583 				free(t0);
8584 				return got_error_from_errno("fprintf");
8585 			}
8586 			first = 0;
8587 			len += s ? 2 : 0;
8588 			*off += n;
8589 		}
8590 		free(t0);
8591 	}
8592 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8593 	if (n < 0)
8594 		return got_error_from_errno("fprintf");
8595 	*off += n;
8596 
8597 	return NULL;
8598 }
8599 
8600 static const struct got_error *
8601 format_help(struct tog_help_view_state *s)
8602 {
8603 	const struct got_error		*err = NULL;
8604 	off_t				 off = 0;
8605 	int				 i, max, n, show = s->all;
8606 	static const struct tog_key_map	 km[] = {
8607 #define KEYMAP_(info, type)	{ NULL, (info), type }
8608 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8609 		GENERATE_HELP
8610 #undef KEYMAP_
8611 #undef KEY_
8612 	};
8613 
8614 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8615 	if (err)
8616 		return err;
8617 
8618 	n = nitems(km);
8619 	err = max_key_str(&max, km, n);
8620 	if (err)
8621 		return err;
8622 
8623 	for (i = 0; i < n; ++i) {
8624 		if (km[i].keys == NULL) {
8625 			show = s->all;
8626 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8627 			    km[i].type == s->type || s->all)
8628 				show = 1;
8629 		}
8630 		if (show) {
8631 			err = format_help_line(&off, s->f, &km[i], max);
8632 			if (err)
8633 				return err;
8634 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8635 			if (err)
8636 				return err;
8637 		}
8638 	}
8639 	fputc('\n', s->f);
8640 	++off;
8641 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8642 	return err;
8643 }
8644 
8645 static const struct got_error *
8646 create_help(struct tog_help_view_state *s)
8647 {
8648 	FILE			*f;
8649 	const struct got_error	*err;
8650 
8651 	free(s->line_offsets);
8652 	s->line_offsets = NULL;
8653 	s->nlines = 0;
8654 
8655 	f = got_opentemp();
8656 	if (f == NULL)
8657 		return got_error_from_errno("got_opentemp");
8658 	s->f = f;
8659 
8660 	err = format_help(s);
8661 	if (err)
8662 		return err;
8663 
8664 	if (s->f && fflush(s->f) != 0)
8665 		return got_error_from_errno("fflush");
8666 
8667 	return NULL;
8668 }
8669 
8670 static const struct got_error *
8671 search_start_help_view(struct tog_view *view)
8672 {
8673 	view->state.help.matched_line = 0;
8674 	return NULL;
8675 }
8676 
8677 static void
8678 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8679     size_t *nlines, int **first, int **last, int **match, int **selected)
8680 {
8681 	struct tog_help_view_state *s = &view->state.help;
8682 
8683 	*f = s->f;
8684 	*nlines = s->nlines;
8685 	*line_offsets = s->line_offsets;
8686 	*match = &s->matched_line;
8687 	*first = &s->first_displayed_line;
8688 	*last = &s->last_displayed_line;
8689 	*selected = &s->selected_line;
8690 }
8691 
8692 static const struct got_error *
8693 show_help_view(struct tog_view *view)
8694 {
8695 	struct tog_help_view_state	*s = &view->state.help;
8696 	const struct got_error		*err;
8697 	regmatch_t			*regmatch = &view->regmatch;
8698 	wchar_t				*wline;
8699 	char				*line;
8700 	ssize_t				 linelen;
8701 	size_t				 linesz = 0;
8702 	int				 width, nprinted = 0, rc = 0;
8703 	int				 eos = view->nlines;
8704 
8705 	if (view_is_hsplit_top(view))
8706 		--eos;  /* account for border */
8707 
8708 	s->lineno = 0;
8709 	rewind(s->f);
8710 	werase(view->window);
8711 
8712 	if (view->gline > s->nlines - 1)
8713 		view->gline = s->nlines - 1;
8714 
8715 	err = win_draw_center(view->window, 0, 0, view->ncols,
8716 	    view_needs_focus_indication(view),
8717 	    "tog help (press q to return to tog)");
8718 	if (err)
8719 		return err;
8720 	if (eos <= 1)
8721 		return NULL;
8722 	waddstr(view->window, "\n\n");
8723 	eos -= 2;
8724 
8725 	s->eof = 0;
8726 	view->maxx = 0;
8727 	line = NULL;
8728 	while (eos > 0 && nprinted < eos) {
8729 		attr_t attr = 0;
8730 
8731 		linelen = getline(&line, &linesz, s->f);
8732 		if (linelen == -1) {
8733 			if (!feof(s->f)) {
8734 				free(line);
8735 				return got_ferror(s->f, GOT_ERR_IO);
8736 			}
8737 			s->eof = 1;
8738 			break;
8739 		}
8740 		if (++s->lineno < s->first_displayed_line)
8741 			continue;
8742 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8743 			continue;
8744 		if (s->lineno == view->hiline)
8745 			attr = A_STANDOUT;
8746 
8747 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8748 		    view->x ? 1 : 0);
8749 		if (err) {
8750 			free(line);
8751 			return err;
8752 		}
8753 		view->maxx = MAX(view->maxx, width);
8754 		free(wline);
8755 		wline = NULL;
8756 
8757 		if (attr)
8758 			wattron(view->window, attr);
8759 		if (s->first_displayed_line + nprinted == s->matched_line &&
8760 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8761 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8762 			    view->window, view->x, regmatch);
8763 			if (err) {
8764 				free(line);
8765 				return err;
8766 			}
8767 		} else {
8768 			int skip;
8769 
8770 			err = format_line(&wline, &width, &skip, line,
8771 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8772 			if (err) {
8773 				free(line);
8774 				return err;
8775 			}
8776 			rc = waddwstr(view->window, &wline[skip]);
8777 			free(wline);
8778 			wline = NULL;
8779 			if (rc == ERR)
8780 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8781 		}
8782 		if (s->lineno == view->hiline) {
8783 			while (width++ < view->ncols)
8784 				waddch(view->window, ' ');
8785 		} else {
8786 			if (width <= view->ncols)
8787 				waddch(view->window, '\n');
8788 		}
8789 		if (attr)
8790 			wattroff(view->window, attr);
8791 		if (++nprinted == 1)
8792 			s->first_displayed_line = s->lineno;
8793 	}
8794 	free(line);
8795 	if (nprinted > 0)
8796 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8797 	else
8798 		s->last_displayed_line = s->first_displayed_line;
8799 
8800 	view_border(view);
8801 
8802 	if (s->eof) {
8803 		rc = waddnstr(view->window,
8804 		    "See the tog(1) manual page for full documentation",
8805 		    view->ncols - 1);
8806 		if (rc == ERR)
8807 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8808 	} else {
8809 		wmove(view->window, view->nlines - 1, 0);
8810 		wclrtoeol(view->window);
8811 		wstandout(view->window);
8812 		rc = waddnstr(view->window, "scroll down for more...",
8813 		    view->ncols - 1);
8814 		if (rc == ERR)
8815 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8816 		if (getcurx(view->window) < view->ncols - 6) {
8817 			rc = wprintw(view->window, "[%.0f%%]",
8818 			    100.00 * s->last_displayed_line / s->nlines);
8819 			if (rc == ERR)
8820 				return got_error_msg(GOT_ERR_IO, "wprintw");
8821 		}
8822 		wstandend(view->window);
8823 	}
8824 
8825 	return NULL;
8826 }
8827 
8828 static const struct got_error *
8829 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8830 {
8831 	struct tog_help_view_state	*s = &view->state.help;
8832 	const struct got_error		*err = NULL;
8833 	char				*line = NULL;
8834 	ssize_t				 linelen;
8835 	size_t				 linesz = 0;
8836 	int				 eos, nscroll;
8837 
8838 	eos = nscroll = view->nlines;
8839 	if (view_is_hsplit_top(view))
8840 		--eos;  /* border */
8841 
8842 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8843 
8844 	switch (ch) {
8845 	case '0':
8846 		view->x = 0;
8847 		break;
8848 	case '$':
8849 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8850 		view->count = 0;
8851 		break;
8852 	case KEY_RIGHT:
8853 	case 'l':
8854 		if (view->x + view->ncols / 3 < view->maxx)
8855 			view->x += 2;
8856 		else
8857 			view->count = 0;
8858 		break;
8859 	case KEY_LEFT:
8860 	case 'h':
8861 		view->x -= MIN(view->x, 2);
8862 		if (view->x <= 0)
8863 			view->count = 0;
8864 		break;
8865 	case 'g':
8866 	case KEY_HOME:
8867 		s->first_displayed_line = 1;
8868 		view->count = 0;
8869 		break;
8870 	case 'G':
8871 	case KEY_END:
8872 		view->count = 0;
8873 		if (s->eof)
8874 			break;
8875 		s->first_displayed_line = (s->nlines - eos) + 3;
8876 		s->eof = 1;
8877 		break;
8878 	case 'k':
8879 	case KEY_UP:
8880 		if (s->first_displayed_line > 1)
8881 			--s->first_displayed_line;
8882 		else
8883 			view->count = 0;
8884 		break;
8885 	case CTRL('u'):
8886 	case 'u':
8887 		nscroll /= 2;
8888 		/* FALL THROUGH */
8889 	case KEY_PPAGE:
8890 	case CTRL('b'):
8891 	case 'b':
8892 		if (s->first_displayed_line == 1) {
8893 			view->count = 0;
8894 			break;
8895 		}
8896 		while (--nscroll > 0 && s->first_displayed_line > 1)
8897 			s->first_displayed_line--;
8898 		break;
8899 	case 'j':
8900 	case KEY_DOWN:
8901 	case CTRL('n'):
8902 		if (!s->eof)
8903 			++s->first_displayed_line;
8904 		else
8905 			view->count = 0;
8906 		break;
8907 	case CTRL('d'):
8908 	case 'd':
8909 		nscroll /= 2;
8910 		/* FALL THROUGH */
8911 	case KEY_NPAGE:
8912 	case CTRL('f'):
8913 	case 'f':
8914 	case ' ':
8915 		if (s->eof) {
8916 			view->count = 0;
8917 			break;
8918 		}
8919 		while (!s->eof && --nscroll > 0) {
8920 			linelen = getline(&line, &linesz, s->f);
8921 			s->first_displayed_line++;
8922 			if (linelen == -1) {
8923 				if (feof(s->f))
8924 					s->eof = 1;
8925 				else
8926 					err = got_ferror(s->f, GOT_ERR_IO);
8927 				break;
8928 			}
8929 		}
8930 		free(line);
8931 		break;
8932 	default:
8933 		view->count = 0;
8934 		break;
8935 	}
8936 
8937 	return err;
8938 }
8939 
8940 static const struct got_error *
8941 close_help_view(struct tog_view *view)
8942 {
8943 	struct tog_help_view_state *s = &view->state.help;
8944 
8945 	free(s->line_offsets);
8946 	s->line_offsets = NULL;
8947 	if (fclose(s->f) == EOF)
8948 		return got_error_from_errno("fclose");
8949 
8950 	return NULL;
8951 }
8952 
8953 static const struct got_error *
8954 reset_help_view(struct tog_view *view)
8955 {
8956 	struct tog_help_view_state *s = &view->state.help;
8957 
8958 
8959 	if (s->f && fclose(s->f) == EOF)
8960 		return got_error_from_errno("fclose");
8961 
8962 	wclear(view->window);
8963 	view->count = 0;
8964 	view->x = 0;
8965 	s->all = !s->all;
8966 	s->first_displayed_line = 1;
8967 	s->last_displayed_line = view->nlines;
8968 	s->matched_line = 0;
8969 
8970 	return create_help(s);
8971 }
8972 
8973 static const struct got_error *
8974 open_help_view(struct tog_view *view, struct tog_view *parent)
8975 {
8976 	const struct got_error		*err = NULL;
8977 	struct tog_help_view_state	*s = &view->state.help;
8978 
8979 	s->type = (enum tog_keymap_type)parent->type;
8980 	s->first_displayed_line = 1;
8981 	s->last_displayed_line = view->nlines;
8982 	s->selected_line = 1;
8983 
8984 	view->show = show_help_view;
8985 	view->input = input_help_view;
8986 	view->reset = reset_help_view;
8987 	view->close = close_help_view;
8988 	view->search_start = search_start_help_view;
8989 	view->search_setup = search_setup_help_view;
8990 	view->search_next = search_next_view_match;
8991 
8992 	err = create_help(s);
8993 	return err;
8994 }
8995 
8996 static const struct got_error *
8997 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8998     enum tog_view_type request, int y, int x)
8999 {
9000 	const struct got_error *err = NULL;
9001 
9002 	*new_view = NULL;
9003 
9004 	switch (request) {
9005 	case TOG_VIEW_DIFF:
9006 		if (view->type == TOG_VIEW_LOG) {
9007 			struct tog_log_view_state *s = &view->state.log;
9008 
9009 			err = open_diff_view_for_commit(new_view, y, x,
9010 			    s->selected_entry->commit, s->selected_entry->id,
9011 			    view, s->repo);
9012 		} else
9013 			return got_error_msg(GOT_ERR_NOT_IMPL,
9014 			    "parent/child view pair not supported");
9015 		break;
9016 	case TOG_VIEW_BLAME:
9017 		if (view->type == TOG_VIEW_TREE) {
9018 			struct tog_tree_view_state *s = &view->state.tree;
9019 
9020 			err = blame_tree_entry(new_view, y, x,
9021 			    s->selected_entry, &s->parents, s->commit_id,
9022 			    s->repo);
9023 		} else
9024 			return got_error_msg(GOT_ERR_NOT_IMPL,
9025 			    "parent/child view pair not supported");
9026 		break;
9027 	case TOG_VIEW_LOG:
9028 		if (view->type == TOG_VIEW_BLAME)
9029 			err = log_annotated_line(new_view, y, x,
9030 			    view->state.blame.repo, view->state.blame.id_to_log);
9031 		else if (view->type == TOG_VIEW_TREE)
9032 			err = log_selected_tree_entry(new_view, y, x,
9033 			    &view->state.tree);
9034 		else if (view->type == TOG_VIEW_REF)
9035 			err = log_ref_entry(new_view, y, x,
9036 			    view->state.ref.selected_entry,
9037 			    view->state.ref.repo);
9038 		else
9039 			return got_error_msg(GOT_ERR_NOT_IMPL,
9040 			    "parent/child view pair not supported");
9041 		break;
9042 	case TOG_VIEW_TREE:
9043 		if (view->type == TOG_VIEW_LOG)
9044 			err = browse_commit_tree(new_view, y, x,
9045 			    view->state.log.selected_entry,
9046 			    view->state.log.in_repo_path,
9047 			    view->state.log.head_ref_name,
9048 			    view->state.log.repo);
9049 		else if (view->type == TOG_VIEW_REF)
9050 			err = browse_ref_tree(new_view, y, x,
9051 			    view->state.ref.selected_entry,
9052 			    view->state.ref.repo);
9053 		else
9054 			return got_error_msg(GOT_ERR_NOT_IMPL,
9055 			    "parent/child view pair not supported");
9056 		break;
9057 	case TOG_VIEW_REF:
9058 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9059 		if (*new_view == NULL)
9060 			return got_error_from_errno("view_open");
9061 		if (view->type == TOG_VIEW_LOG)
9062 			err = open_ref_view(*new_view, view->state.log.repo);
9063 		else if (view->type == TOG_VIEW_TREE)
9064 			err = open_ref_view(*new_view, view->state.tree.repo);
9065 		else
9066 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9067 			    "parent/child view pair not supported");
9068 		if (err)
9069 			view_close(*new_view);
9070 		break;
9071 	case TOG_VIEW_HELP:
9072 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9073 		if (*new_view == NULL)
9074 			return got_error_from_errno("view_open");
9075 		err = open_help_view(*new_view, view);
9076 		if (err)
9077 			view_close(*new_view);
9078 		break;
9079 	default:
9080 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9081 	}
9082 
9083 	return err;
9084 }
9085 
9086 /*
9087  * If view was scrolled down to move the selected line into view when opening a
9088  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9089  */
9090 static void
9091 offset_selection_up(struct tog_view *view)
9092 {
9093 	switch (view->type) {
9094 	case TOG_VIEW_BLAME: {
9095 		struct tog_blame_view_state *s = &view->state.blame;
9096 		if (s->first_displayed_line == 1) {
9097 			s->selected_line = MAX(s->selected_line - view->offset,
9098 			    1);
9099 			break;
9100 		}
9101 		if (s->first_displayed_line > view->offset)
9102 			s->first_displayed_line -= view->offset;
9103 		else
9104 			s->first_displayed_line = 1;
9105 		s->selected_line += view->offset;
9106 		break;
9107 	}
9108 	case TOG_VIEW_LOG:
9109 		log_scroll_up(&view->state.log, view->offset);
9110 		view->state.log.selected += view->offset;
9111 		break;
9112 	case TOG_VIEW_REF:
9113 		ref_scroll_up(&view->state.ref, view->offset);
9114 		view->state.ref.selected += view->offset;
9115 		break;
9116 	case TOG_VIEW_TREE:
9117 		tree_scroll_up(&view->state.tree, view->offset);
9118 		view->state.tree.selected += view->offset;
9119 		break;
9120 	default:
9121 		break;
9122 	}
9123 
9124 	view->offset = 0;
9125 }
9126 
9127 /*
9128  * If the selected line is in the section of screen covered by the bottom split,
9129  * scroll down offset lines to move it into view and index its new position.
9130  */
9131 static const struct got_error *
9132 offset_selection_down(struct tog_view *view)
9133 {
9134 	const struct got_error	*err = NULL;
9135 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9136 	int			*selected = NULL;
9137 	int			 header, offset;
9138 
9139 	switch (view->type) {
9140 	case TOG_VIEW_BLAME: {
9141 		struct tog_blame_view_state *s = &view->state.blame;
9142 		header = 3;
9143 		scrolld = NULL;
9144 		if (s->selected_line > view->nlines - header) {
9145 			offset = abs(view->nlines - s->selected_line - header);
9146 			s->first_displayed_line += offset;
9147 			s->selected_line -= offset;
9148 			view->offset = offset;
9149 		}
9150 		break;
9151 	}
9152 	case TOG_VIEW_LOG: {
9153 		struct tog_log_view_state *s = &view->state.log;
9154 		scrolld = &log_scroll_down;
9155 		header = view_is_parent_view(view) ? 3 : 2;
9156 		selected = &s->selected;
9157 		break;
9158 	}
9159 	case TOG_VIEW_REF: {
9160 		struct tog_ref_view_state *s = &view->state.ref;
9161 		scrolld = &ref_scroll_down;
9162 		header = 3;
9163 		selected = &s->selected;
9164 		break;
9165 	}
9166 	case TOG_VIEW_TREE: {
9167 		struct tog_tree_view_state *s = &view->state.tree;
9168 		scrolld = &tree_scroll_down;
9169 		header = 5;
9170 		selected = &s->selected;
9171 		break;
9172 	}
9173 	default:
9174 		selected = NULL;
9175 		scrolld = NULL;
9176 		header = 0;
9177 		break;
9178 	}
9179 
9180 	if (selected && *selected > view->nlines - header) {
9181 		offset = abs(view->nlines - *selected - header);
9182 		view->offset = offset;
9183 		if (scrolld && offset) {
9184 			err = scrolld(view, offset);
9185 			*selected -= offset;
9186 		}
9187 	}
9188 
9189 	return err;
9190 }
9191 
9192 static void
9193 list_commands(FILE *fp)
9194 {
9195 	size_t i;
9196 
9197 	fprintf(fp, "commands:");
9198 	for (i = 0; i < nitems(tog_commands); i++) {
9199 		const struct tog_cmd *cmd = &tog_commands[i];
9200 		fprintf(fp, " %s", cmd->name);
9201 	}
9202 	fputc('\n', fp);
9203 }
9204 
9205 __dead static void
9206 usage(int hflag, int status)
9207 {
9208 	FILE *fp = (status == 0) ? stdout : stderr;
9209 
9210 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9211 	    getprogname());
9212 	if (hflag) {
9213 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9214 		list_commands(fp);
9215 	}
9216 	exit(status);
9217 }
9218 
9219 static char **
9220 make_argv(int argc, ...)
9221 {
9222 	va_list ap;
9223 	char **argv;
9224 	int i;
9225 
9226 	va_start(ap, argc);
9227 
9228 	argv = calloc(argc, sizeof(char *));
9229 	if (argv == NULL)
9230 		err(1, "calloc");
9231 	for (i = 0; i < argc; i++) {
9232 		argv[i] = strdup(va_arg(ap, char *));
9233 		if (argv[i] == NULL)
9234 			err(1, "strdup");
9235 	}
9236 
9237 	va_end(ap);
9238 	return argv;
9239 }
9240 
9241 /*
9242  * Try to convert 'tog path' into a 'tog log path' command.
9243  * The user could simply have mistyped the command rather than knowingly
9244  * provided a path. So check whether argv[0] can in fact be resolved
9245  * to a path in the HEAD commit and print a special error if not.
9246  * This hack is for mpi@ <3
9247  */
9248 static const struct got_error *
9249 tog_log_with_path(int argc, char *argv[])
9250 {
9251 	const struct got_error *error = NULL, *close_err;
9252 	const struct tog_cmd *cmd = NULL;
9253 	struct got_repository *repo = NULL;
9254 	struct got_worktree *worktree = NULL;
9255 	struct got_object_id *commit_id = NULL, *id = NULL;
9256 	struct got_commit_object *commit = NULL;
9257 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9258 	char *commit_id_str = NULL, **cmd_argv = NULL;
9259 	int *pack_fds = NULL;
9260 
9261 	cwd = getcwd(NULL, 0);
9262 	if (cwd == NULL)
9263 		return got_error_from_errno("getcwd");
9264 
9265 	error = got_repo_pack_fds_open(&pack_fds);
9266 	if (error != NULL)
9267 		goto done;
9268 
9269 	error = got_worktree_open(&worktree, cwd);
9270 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9271 		goto done;
9272 
9273 	if (worktree)
9274 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9275 	else
9276 		repo_path = strdup(cwd);
9277 	if (repo_path == NULL) {
9278 		error = got_error_from_errno("strdup");
9279 		goto done;
9280 	}
9281 
9282 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9283 	if (error != NULL)
9284 		goto done;
9285 
9286 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9287 	    repo, worktree);
9288 	if (error)
9289 		goto done;
9290 
9291 	error = tog_load_refs(repo, 0);
9292 	if (error)
9293 		goto done;
9294 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9295 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9296 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9297 	if (error)
9298 		goto done;
9299 
9300 	if (worktree) {
9301 		got_worktree_close(worktree);
9302 		worktree = NULL;
9303 	}
9304 
9305 	error = got_object_open_as_commit(&commit, repo, commit_id);
9306 	if (error)
9307 		goto done;
9308 
9309 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9310 	if (error) {
9311 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9312 			goto done;
9313 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9314 		    getprogname(), argv[0]);
9315 		usage(1, 1);
9316 		/* not reached */
9317 	}
9318 
9319 	error = got_object_id_str(&commit_id_str, commit_id);
9320 	if (error)
9321 		goto done;
9322 
9323 	cmd = &tog_commands[0]; /* log */
9324 	argc = 4;
9325 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9326 	error = cmd->cmd_main(argc, cmd_argv);
9327 done:
9328 	if (repo) {
9329 		close_err = got_repo_close(repo);
9330 		if (error == NULL)
9331 			error = close_err;
9332 	}
9333 	if (commit)
9334 		got_object_commit_close(commit);
9335 	if (worktree)
9336 		got_worktree_close(worktree);
9337 	if (pack_fds) {
9338 		const struct got_error *pack_err =
9339 		    got_repo_pack_fds_close(pack_fds);
9340 		if (error == NULL)
9341 			error = pack_err;
9342 	}
9343 	free(id);
9344 	free(commit_id_str);
9345 	free(commit_id);
9346 	free(cwd);
9347 	free(repo_path);
9348 	free(in_repo_path);
9349 	if (cmd_argv) {
9350 		int i;
9351 		for (i = 0; i < argc; i++)
9352 			free(cmd_argv[i]);
9353 		free(cmd_argv);
9354 	}
9355 	tog_free_refs();
9356 	return error;
9357 }
9358 
9359 int
9360 main(int argc, char *argv[])
9361 {
9362 	const struct got_error *error = NULL;
9363 	const struct tog_cmd *cmd = NULL;
9364 	int ch, hflag = 0, Vflag = 0;
9365 	char **cmd_argv = NULL;
9366 	static const struct option longopts[] = {
9367 	    { "version", no_argument, NULL, 'V' },
9368 	    { NULL, 0, NULL, 0}
9369 	};
9370 	char *diff_algo_str = NULL;
9371 
9372 	if (!isatty(STDIN_FILENO))
9373 		errx(1, "standard input is not a tty");
9374 
9375 	setlocale(LC_CTYPE, "");
9376 
9377 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9378 		switch (ch) {
9379 		case 'h':
9380 			hflag = 1;
9381 			break;
9382 		case 'V':
9383 			Vflag = 1;
9384 			break;
9385 		default:
9386 			usage(hflag, 1);
9387 			/* NOTREACHED */
9388 		}
9389 	}
9390 
9391 	argc -= optind;
9392 	argv += optind;
9393 	optind = 1;
9394 	optreset = 1;
9395 
9396 	if (Vflag) {
9397 		got_version_print_str();
9398 		return 0;
9399 	}
9400 
9401 #ifndef PROFILE
9402 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9403 	    NULL) == -1)
9404 		err(1, "pledge");
9405 #endif
9406 
9407 	if (argc == 0) {
9408 		if (hflag)
9409 			usage(hflag, 0);
9410 		/* Build an argument vector which runs a default command. */
9411 		cmd = &tog_commands[0];
9412 		argc = 1;
9413 		cmd_argv = make_argv(argc, cmd->name);
9414 	} else {
9415 		size_t i;
9416 
9417 		/* Did the user specify a command? */
9418 		for (i = 0; i < nitems(tog_commands); i++) {
9419 			if (strncmp(tog_commands[i].name, argv[0],
9420 			    strlen(argv[0])) == 0) {
9421 				cmd = &tog_commands[i];
9422 				break;
9423 			}
9424 		}
9425 	}
9426 
9427 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9428 	if (diff_algo_str) {
9429 		if (strcasecmp(diff_algo_str, "patience") == 0)
9430 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9431 		if (strcasecmp(diff_algo_str, "myers") == 0)
9432 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9433 	}
9434 
9435 	if (cmd == NULL) {
9436 		if (argc != 1)
9437 			usage(0, 1);
9438 		/* No command specified; try log with a path */
9439 		error = tog_log_with_path(argc, argv);
9440 	} else {
9441 		if (hflag)
9442 			cmd->cmd_usage();
9443 		else
9444 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9445 	}
9446 
9447 	endwin();
9448 	putchar('\n');
9449 	if (cmd_argv) {
9450 		int i;
9451 		for (i = 0; i < argc; i++)
9452 			free(cmd_argv[i]);
9453 		free(cmd_argv);
9454 	}
9455 
9456 	if (error && error->code != GOT_ERR_CANCELLED &&
9457 	    error->code != GOT_ERR_EOF &&
9458 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9459 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9460 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9461 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9462 	return 0;
9463 }