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 {
4462 	const struct got_error *err = NULL;
4463 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4464 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4465 	struct got_object_qid *qid;
4466 
4467 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4468 	if (qid != NULL) {
4469 		struct got_commit_object *pcommit;
4470 		err = got_object_open_as_commit(&pcommit, repo,
4471 		    &qid->id);
4472 		if (err)
4473 			return err;
4474 
4475 		tree_id1 = got_object_id_dup(
4476 		    got_object_commit_get_tree_id(pcommit));
4477 		if (tree_id1 == NULL) {
4478 			got_object_commit_close(pcommit);
4479 			return got_error_from_errno("got_object_id_dup");
4480 		}
4481 		got_object_commit_close(pcommit);
4482 
4483 	}
4484 
4485 	if (tree_id1) {
4486 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4487 		if (err)
4488 			goto done;
4489 	}
4490 
4491 	tree_id2 = got_object_commit_get_tree_id(commit);
4492 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4493 	if (err)
4494 		goto done;
4495 
4496 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4497 	    got_diff_tree_collect_changed_paths, paths, 0);
4498 done:
4499 	if (tree1)
4500 		got_object_tree_close(tree1);
4501 	if (tree2)
4502 		got_object_tree_close(tree2);
4503 	free(tree_id1);
4504 	return err;
4505 }
4506 
4507 static const struct got_error *
4508 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4509     off_t off, uint8_t type)
4510 {
4511 	struct got_diff_line *p;
4512 
4513 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4514 	if (p == NULL)
4515 		return got_error_from_errno("reallocarray");
4516 	*lines = p;
4517 	(*lines)[*nlines].offset = off;
4518 	(*lines)[*nlines].type = type;
4519 	(*nlines)++;
4520 
4521 	return NULL;
4522 }
4523 
4524 static const struct got_error *
4525 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4526     struct got_object_id *commit_id, struct got_reflist_head *refs,
4527     struct got_repository *repo, FILE *outfile)
4528 {
4529 	const struct got_error *err = NULL;
4530 	char datebuf[26], *datestr;
4531 	struct got_commit_object *commit;
4532 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4533 	time_t committer_time;
4534 	const char *author, *committer;
4535 	char *refs_str = NULL;
4536 	struct got_pathlist_head changed_paths;
4537 	struct got_pathlist_entry *pe;
4538 	off_t outoff = 0;
4539 	int n;
4540 
4541 	TAILQ_INIT(&changed_paths);
4542 
4543 	if (refs) {
4544 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4545 		if (err)
4546 			return err;
4547 	}
4548 
4549 	err = got_object_open_as_commit(&commit, repo, commit_id);
4550 	if (err)
4551 		return err;
4552 
4553 	err = got_object_id_str(&id_str, commit_id);
4554 	if (err) {
4555 		err = got_error_from_errno("got_object_id_str");
4556 		goto done;
4557 	}
4558 
4559 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4560 	if (err)
4561 		goto done;
4562 
4563 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4564 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4565 	if (n < 0) {
4566 		err = got_error_from_errno("fprintf");
4567 		goto done;
4568 	}
4569 	outoff += n;
4570 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4571 	if (err)
4572 		goto done;
4573 
4574 	n = fprintf(outfile, "from: %s\n",
4575 	    got_object_commit_get_author(commit));
4576 	if (n < 0) {
4577 		err = got_error_from_errno("fprintf");
4578 		goto done;
4579 	}
4580 	outoff += n;
4581 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4582 	if (err)
4583 		goto done;
4584 
4585 	committer_time = got_object_commit_get_committer_time(commit);
4586 	datestr = get_datestr(&committer_time, datebuf);
4587 	if (datestr) {
4588 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4589 		if (n < 0) {
4590 			err = got_error_from_errno("fprintf");
4591 			goto done;
4592 		}
4593 		outoff += n;
4594 		err = add_line_metadata(lines, nlines, outoff,
4595 		    GOT_DIFF_LINE_DATE);
4596 		if (err)
4597 			goto done;
4598 	}
4599 	author = got_object_commit_get_author(commit);
4600 	committer = got_object_commit_get_committer(commit);
4601 	if (strcmp(author, committer) != 0) {
4602 		n = fprintf(outfile, "via: %s\n", committer);
4603 		if (n < 0) {
4604 			err = got_error_from_errno("fprintf");
4605 			goto done;
4606 		}
4607 		outoff += n;
4608 		err = add_line_metadata(lines, nlines, outoff,
4609 		    GOT_DIFF_LINE_AUTHOR);
4610 		if (err)
4611 			goto done;
4612 	}
4613 	if (got_object_commit_get_nparents(commit) > 1) {
4614 		const struct got_object_id_queue *parent_ids;
4615 		struct got_object_qid *qid;
4616 		int pn = 1;
4617 		parent_ids = got_object_commit_get_parent_ids(commit);
4618 		STAILQ_FOREACH(qid, parent_ids, entry) {
4619 			err = got_object_id_str(&id_str, &qid->id);
4620 			if (err)
4621 				goto done;
4622 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4623 			if (n < 0) {
4624 				err = got_error_from_errno("fprintf");
4625 				goto done;
4626 			}
4627 			outoff += n;
4628 			err = add_line_metadata(lines, nlines, outoff,
4629 			    GOT_DIFF_LINE_META);
4630 			if (err)
4631 				goto done;
4632 			free(id_str);
4633 			id_str = NULL;
4634 		}
4635 	}
4636 
4637 	err = got_object_commit_get_logmsg(&logmsg, commit);
4638 	if (err)
4639 		goto done;
4640 	s = logmsg;
4641 	while ((line = strsep(&s, "\n")) != NULL) {
4642 		n = fprintf(outfile, "%s\n", line);
4643 		if (n < 0) {
4644 			err = got_error_from_errno("fprintf");
4645 			goto done;
4646 		}
4647 		outoff += n;
4648 		err = add_line_metadata(lines, nlines, outoff,
4649 		    GOT_DIFF_LINE_LOGMSG);
4650 		if (err)
4651 			goto done;
4652 	}
4653 
4654 	err = get_changed_paths(&changed_paths, commit, repo);
4655 	if (err)
4656 		goto done;
4657 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4658 		struct got_diff_changed_path *cp = pe->data;
4659 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4660 		if (n < 0) {
4661 			err = got_error_from_errno("fprintf");
4662 			goto done;
4663 		}
4664 		outoff += n;
4665 		err = add_line_metadata(lines, nlines, outoff,
4666 		    GOT_DIFF_LINE_CHANGES);
4667 		if (err)
4668 			goto done;
4669 		free((char *)pe->path);
4670 		free(pe->data);
4671 	}
4672 
4673 	fputc('\n', outfile);
4674 	outoff++;
4675 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4676 done:
4677 	got_pathlist_free(&changed_paths);
4678 	free(id_str);
4679 	free(logmsg);
4680 	free(refs_str);
4681 	got_object_commit_close(commit);
4682 	if (err) {
4683 		free(*lines);
4684 		*lines = NULL;
4685 		*nlines = 0;
4686 	}
4687 	return err;
4688 }
4689 
4690 static const struct got_error *
4691 create_diff(struct tog_diff_view_state *s)
4692 {
4693 	const struct got_error *err = NULL;
4694 	FILE *f = NULL;
4695 	int obj_type;
4696 
4697 	free(s->lines);
4698 	s->lines = malloc(sizeof(*s->lines));
4699 	if (s->lines == NULL)
4700 		return got_error_from_errno("malloc");
4701 	s->nlines = 0;
4702 
4703 	f = got_opentemp();
4704 	if (f == NULL) {
4705 		err = got_error_from_errno("got_opentemp");
4706 		goto done;
4707 	}
4708 	if (s->f && fclose(s->f) == EOF) {
4709 		err = got_error_from_errno("fclose");
4710 		goto done;
4711 	}
4712 	s->f = f;
4713 
4714 	if (s->id1)
4715 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4716 	else
4717 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4718 	if (err)
4719 		goto done;
4720 
4721 	switch (obj_type) {
4722 	case GOT_OBJ_TYPE_BLOB:
4723 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4724 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4725 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4726 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4727 		break;
4728 	case GOT_OBJ_TYPE_TREE:
4729 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4730 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4731 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4732 		    s->force_text_diff, s->repo, s->f);
4733 		break;
4734 	case GOT_OBJ_TYPE_COMMIT: {
4735 		const struct got_object_id_queue *parent_ids;
4736 		struct got_object_qid *pid;
4737 		struct got_commit_object *commit2;
4738 		struct got_reflist_head *refs;
4739 
4740 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4741 		if (err)
4742 			goto done;
4743 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4744 		/* Show commit info if we're diffing to a parent/root commit. */
4745 		if (s->id1 == NULL) {
4746 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4747 			    refs, s->repo, s->f);
4748 			if (err)
4749 				goto done;
4750 		} else {
4751 			parent_ids = got_object_commit_get_parent_ids(commit2);
4752 			STAILQ_FOREACH(pid, parent_ids, entry) {
4753 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4754 					err = write_commit_info(&s->lines,
4755 					    &s->nlines, s->id2, refs, s->repo,
4756 					    s->f);
4757 					if (err)
4758 						goto done;
4759 					break;
4760 				}
4761 			}
4762 		}
4763 		got_object_commit_close(commit2);
4764 
4765 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4766 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4767 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4768 		    s->force_text_diff, s->repo, s->f);
4769 		break;
4770 	}
4771 	default:
4772 		err = got_error(GOT_ERR_OBJ_TYPE);
4773 		break;
4774 	}
4775 done:
4776 	if (s->f && fflush(s->f) != 0 && err == NULL)
4777 		err = got_error_from_errno("fflush");
4778 	return err;
4779 }
4780 
4781 static void
4782 diff_view_indicate_progress(struct tog_view *view)
4783 {
4784 	mvwaddstr(view->window, 0, 0, "diffing...");
4785 	update_panels();
4786 	doupdate();
4787 }
4788 
4789 static const struct got_error *
4790 search_start_diff_view(struct tog_view *view)
4791 {
4792 	struct tog_diff_view_state *s = &view->state.diff;
4793 
4794 	s->matched_line = 0;
4795 	return NULL;
4796 }
4797 
4798 static void
4799 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
4800     size_t *nlines, int **first, int **last, int **match, int **selected)
4801 {
4802 	struct tog_diff_view_state *s = &view->state.diff;
4803 
4804 	*f = s->f;
4805 	*nlines = s->nlines;
4806 	*line_offsets = NULL;
4807 	*match = &s->matched_line;
4808 	*first = &s->first_displayed_line;
4809 	*last = &s->last_displayed_line;
4810 	*selected = &s->selected_line;
4811 }
4812 
4813 static const struct got_error *
4814 search_next_view_match(struct tog_view *view)
4815 {
4816 	const struct got_error *err = NULL;
4817 	FILE *f;
4818 	int lineno;
4819 	char *line = NULL;
4820 	size_t linesize = 0;
4821 	ssize_t linelen;
4822 	off_t *line_offsets;
4823 	size_t nlines = 0;
4824 	int *first, *last, *match, *selected;
4825 
4826 	if (!view->search_setup)
4827 		return got_error_msg(GOT_ERR_NOT_IMPL,
4828 		    "view search not supported");
4829 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
4830 	    &match, &selected);
4831 
4832 	if (!view->searching) {
4833 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4834 		return NULL;
4835 	}
4836 
4837 	if (*match) {
4838 		if (view->searching == TOG_SEARCH_FORWARD)
4839 			lineno = *match + 1;
4840 		else
4841 			lineno = *match - 1;
4842 	} else
4843 		lineno = *first - 1 + *selected;
4844 
4845 	while (1) {
4846 		off_t offset;
4847 
4848 		if (lineno <= 0 || lineno > nlines) {
4849 			if (*match == 0) {
4850 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4851 				break;
4852 			}
4853 
4854 			if (view->searching == TOG_SEARCH_FORWARD)
4855 				lineno = 1;
4856 			else
4857 				lineno = nlines;
4858 		}
4859 
4860 		offset = view->type == TOG_VIEW_DIFF ?
4861 		    view->state.diff.lines[lineno - 1].offset :
4862 		    line_offsets[lineno - 1];
4863 		if (fseeko(f, offset, SEEK_SET) != 0) {
4864 			free(line);
4865 			return got_error_from_errno("fseeko");
4866 		}
4867 		linelen = getline(&line, &linesize, f);
4868 		if (linelen != -1) {
4869 			char *exstr;
4870 			err = expand_tab(&exstr, line);
4871 			if (err)
4872 				break;
4873 			if (match_line(exstr, &view->regex, 1,
4874 			    &view->regmatch)) {
4875 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4876 				*match = lineno;
4877 				free(exstr);
4878 				break;
4879 			}
4880 			free(exstr);
4881 		}
4882 		if (view->searching == TOG_SEARCH_FORWARD)
4883 			lineno++;
4884 		else
4885 			lineno--;
4886 	}
4887 	free(line);
4888 
4889 	if (*match) {
4890 		*first = *match;
4891 		*selected = 1;
4892 	}
4893 
4894 	return err;
4895 }
4896 
4897 static const struct got_error *
4898 close_diff_view(struct tog_view *view)
4899 {
4900 	const struct got_error *err = NULL;
4901 	struct tog_diff_view_state *s = &view->state.diff;
4902 
4903 	free(s->id1);
4904 	s->id1 = NULL;
4905 	free(s->id2);
4906 	s->id2 = NULL;
4907 	if (s->f && fclose(s->f) == EOF)
4908 		err = got_error_from_errno("fclose");
4909 	s->f = NULL;
4910 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4911 		err = got_error_from_errno("fclose");
4912 	s->f1 = NULL;
4913 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4914 		err = got_error_from_errno("fclose");
4915 	s->f2 = NULL;
4916 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4917 		err = got_error_from_errno("close");
4918 	s->fd1 = -1;
4919 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4920 		err = got_error_from_errno("close");
4921 	s->fd2 = -1;
4922 	free(s->lines);
4923 	s->lines = NULL;
4924 	s->nlines = 0;
4925 	return err;
4926 }
4927 
4928 static const struct got_error *
4929 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4930     struct got_object_id *id2, const char *label1, const char *label2,
4931     int diff_context, int ignore_whitespace, int force_text_diff,
4932     struct tog_view *parent_view, struct got_repository *repo)
4933 {
4934 	const struct got_error *err;
4935 	struct tog_diff_view_state *s = &view->state.diff;
4936 
4937 	memset(s, 0, sizeof(*s));
4938 	s->fd1 = -1;
4939 	s->fd2 = -1;
4940 
4941 	if (id1 != NULL && id2 != NULL) {
4942 	    int type1, type2;
4943 	    err = got_object_get_type(&type1, repo, id1);
4944 	    if (err)
4945 		return err;
4946 	    err = got_object_get_type(&type2, repo, id2);
4947 	    if (err)
4948 		return err;
4949 
4950 	    if (type1 != type2)
4951 		return got_error(GOT_ERR_OBJ_TYPE);
4952 	}
4953 	s->first_displayed_line = 1;
4954 	s->last_displayed_line = view->nlines;
4955 	s->selected_line = 1;
4956 	s->repo = repo;
4957 	s->id1 = id1;
4958 	s->id2 = id2;
4959 	s->label1 = label1;
4960 	s->label2 = label2;
4961 
4962 	if (id1) {
4963 		s->id1 = got_object_id_dup(id1);
4964 		if (s->id1 == NULL)
4965 			return got_error_from_errno("got_object_id_dup");
4966 	} else
4967 		s->id1 = NULL;
4968 
4969 	s->id2 = got_object_id_dup(id2);
4970 	if (s->id2 == NULL) {
4971 		err = got_error_from_errno("got_object_id_dup");
4972 		goto done;
4973 	}
4974 
4975 	s->f1 = got_opentemp();
4976 	if (s->f1 == NULL) {
4977 		err = got_error_from_errno("got_opentemp");
4978 		goto done;
4979 	}
4980 
4981 	s->f2 = got_opentemp();
4982 	if (s->f2 == NULL) {
4983 		err = got_error_from_errno("got_opentemp");
4984 		goto done;
4985 	}
4986 
4987 	s->fd1 = got_opentempfd();
4988 	if (s->fd1 == -1) {
4989 		err = got_error_from_errno("got_opentempfd");
4990 		goto done;
4991 	}
4992 
4993 	s->fd2 = got_opentempfd();
4994 	if (s->fd2 == -1) {
4995 		err = got_error_from_errno("got_opentempfd");
4996 		goto done;
4997 	}
4998 
4999 	s->first_displayed_line = 1;
5000 	s->last_displayed_line = view->nlines;
5001 	s->diff_context = diff_context;
5002 	s->ignore_whitespace = ignore_whitespace;
5003 	s->force_text_diff = force_text_diff;
5004 	s->parent_view = parent_view;
5005 	s->repo = repo;
5006 
5007 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5008 		int rc;
5009 
5010 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5011 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5012 		if (rc != ERR)
5013 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5014 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5015 		if (rc != ERR)
5016 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5017 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5018 		if (rc != ERR)
5019 			rc = init_pair(GOT_DIFF_LINE_META,
5020 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5021 		if (rc != ERR)
5022 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5023 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5024 		if (rc != ERR)
5025 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5026 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5027 		if (rc != ERR)
5028 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5029 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5030 		if (rc != ERR)
5031 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5032 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5033 		if (rc != ERR)
5034 			rc = init_pair(GOT_DIFF_LINE_DATE,
5035 			    get_color_value("TOG_COLOR_DATE"), -1);
5036 		if (rc == ERR) {
5037 			err = got_error(GOT_ERR_RANGE);
5038 			goto done;
5039 		}
5040 	}
5041 
5042 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5043 	    view_is_splitscreen(view))
5044 		show_log_view(parent_view); /* draw border */
5045 	diff_view_indicate_progress(view);
5046 
5047 	err = create_diff(s);
5048 
5049 	view->show = show_diff_view;
5050 	view->input = input_diff_view;
5051 	view->reset = reset_diff_view;
5052 	view->close = close_diff_view;
5053 	view->search_start = search_start_diff_view;
5054 	view->search_setup = search_setup_diff_view;
5055 	view->search_next = search_next_view_match;
5056 done:
5057 	if (err)
5058 		close_diff_view(view);
5059 	return err;
5060 }
5061 
5062 static const struct got_error *
5063 show_diff_view(struct tog_view *view)
5064 {
5065 	const struct got_error *err;
5066 	struct tog_diff_view_state *s = &view->state.diff;
5067 	char *id_str1 = NULL, *id_str2, *header;
5068 	const char *label1, *label2;
5069 
5070 	if (s->id1) {
5071 		err = got_object_id_str(&id_str1, s->id1);
5072 		if (err)
5073 			return err;
5074 		label1 = s->label1 ? s->label1 : id_str1;
5075 	} else
5076 		label1 = "/dev/null";
5077 
5078 	err = got_object_id_str(&id_str2, s->id2);
5079 	if (err)
5080 		return err;
5081 	label2 = s->label2 ? s->label2 : id_str2;
5082 
5083 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5084 		err = got_error_from_errno("asprintf");
5085 		free(id_str1);
5086 		free(id_str2);
5087 		return err;
5088 	}
5089 	free(id_str1);
5090 	free(id_str2);
5091 
5092 	err = draw_file(view, header);
5093 	free(header);
5094 	return err;
5095 }
5096 
5097 static const struct got_error *
5098 set_selected_commit(struct tog_diff_view_state *s,
5099     struct commit_queue_entry *entry)
5100 {
5101 	const struct got_error *err;
5102 	const struct got_object_id_queue *parent_ids;
5103 	struct got_commit_object *selected_commit;
5104 	struct got_object_qid *pid;
5105 
5106 	free(s->id2);
5107 	s->id2 = got_object_id_dup(entry->id);
5108 	if (s->id2 == NULL)
5109 		return got_error_from_errno("got_object_id_dup");
5110 
5111 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5112 	if (err)
5113 		return err;
5114 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5115 	free(s->id1);
5116 	pid = STAILQ_FIRST(parent_ids);
5117 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5118 	got_object_commit_close(selected_commit);
5119 	return NULL;
5120 }
5121 
5122 static const struct got_error *
5123 reset_diff_view(struct tog_view *view)
5124 {
5125 	struct tog_diff_view_state *s = &view->state.diff;
5126 
5127 	view->count = 0;
5128 	wclear(view->window);
5129 	s->first_displayed_line = 1;
5130 	s->last_displayed_line = view->nlines;
5131 	s->matched_line = 0;
5132 	diff_view_indicate_progress(view);
5133 	return create_diff(s);
5134 }
5135 
5136 static void
5137 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5138 {
5139 	int start, i;
5140 
5141 	i = start = s->first_displayed_line - 1;
5142 
5143 	while (s->lines[i].type != type) {
5144 		if (i == 0)
5145 			i = s->nlines - 1;
5146 		if (--i == start)
5147 			return; /* do nothing, requested type not in file */
5148 	}
5149 
5150 	s->selected_line = 1;
5151 	s->first_displayed_line = i;
5152 }
5153 
5154 static void
5155 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5156 {
5157 	int start, i;
5158 
5159 	i = start = s->first_displayed_line + 1;
5160 
5161 	while (s->lines[i].type != type) {
5162 		if (i == s->nlines - 1)
5163 			i = 0;
5164 		if (++i == start)
5165 			return; /* do nothing, requested type not in file */
5166 	}
5167 
5168 	s->selected_line = 1;
5169 	s->first_displayed_line = i;
5170 }
5171 
5172 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5173     int, int, int);
5174 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5175     int, int);
5176 
5177 static const struct got_error *
5178 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5179 {
5180 	const struct got_error *err = NULL;
5181 	struct tog_diff_view_state *s = &view->state.diff;
5182 	struct tog_log_view_state *ls;
5183 	struct commit_queue_entry *old_selected_entry;
5184 	char *line = NULL;
5185 	size_t linesize = 0;
5186 	ssize_t linelen;
5187 	int i, nscroll = view->nlines - 1, up = 0;
5188 
5189 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5190 
5191 	switch (ch) {
5192 	case '0':
5193 		view->x = 0;
5194 		break;
5195 	case '$':
5196 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5197 		view->count = 0;
5198 		break;
5199 	case KEY_RIGHT:
5200 	case 'l':
5201 		if (view->x + view->ncols / 3 < view->maxx)
5202 			view->x += 2;  /* move two columns right */
5203 		else
5204 			view->count = 0;
5205 		break;
5206 	case KEY_LEFT:
5207 	case 'h':
5208 		view->x -= MIN(view->x, 2);  /* move two columns back */
5209 		if (view->x <= 0)
5210 			view->count = 0;
5211 		break;
5212 	case 'a':
5213 	case 'w':
5214 		if (ch == 'a')
5215 			s->force_text_diff = !s->force_text_diff;
5216 		if (ch == 'w')
5217 			s->ignore_whitespace = !s->ignore_whitespace;
5218 		err = reset_diff_view(view);
5219 		break;
5220 	case 'g':
5221 	case KEY_HOME:
5222 		s->first_displayed_line = 1;
5223 		view->count = 0;
5224 		break;
5225 	case 'G':
5226 	case KEY_END:
5227 		view->count = 0;
5228 		if (s->eof)
5229 			break;
5230 
5231 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5232 		s->eof = 1;
5233 		break;
5234 	case 'k':
5235 	case KEY_UP:
5236 	case CTRL('p'):
5237 		if (s->first_displayed_line > 1)
5238 			s->first_displayed_line--;
5239 		else
5240 			view->count = 0;
5241 		break;
5242 	case CTRL('u'):
5243 	case 'u':
5244 		nscroll /= 2;
5245 		/* FALL THROUGH */
5246 	case KEY_PPAGE:
5247 	case CTRL('b'):
5248 	case 'b':
5249 		if (s->first_displayed_line == 1) {
5250 			view->count = 0;
5251 			break;
5252 		}
5253 		i = 0;
5254 		while (i++ < nscroll && s->first_displayed_line > 1)
5255 			s->first_displayed_line--;
5256 		break;
5257 	case 'j':
5258 	case KEY_DOWN:
5259 	case CTRL('n'):
5260 		if (!s->eof)
5261 			s->first_displayed_line++;
5262 		else
5263 			view->count = 0;
5264 		break;
5265 	case CTRL('d'):
5266 	case 'd':
5267 		nscroll /= 2;
5268 		/* FALL THROUGH */
5269 	case KEY_NPAGE:
5270 	case CTRL('f'):
5271 	case 'f':
5272 	case ' ':
5273 		if (s->eof) {
5274 			view->count = 0;
5275 			break;
5276 		}
5277 		i = 0;
5278 		while (!s->eof && i++ < nscroll) {
5279 			linelen = getline(&line, &linesize, s->f);
5280 			s->first_displayed_line++;
5281 			if (linelen == -1) {
5282 				if (feof(s->f)) {
5283 					s->eof = 1;
5284 				} else
5285 					err = got_ferror(s->f, GOT_ERR_IO);
5286 				break;
5287 			}
5288 		}
5289 		free(line);
5290 		break;
5291 	case '(':
5292 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5293 		break;
5294 	case ')':
5295 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5296 		break;
5297 	case '{':
5298 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5299 		break;
5300 	case '}':
5301 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5302 		break;
5303 	case '[':
5304 		if (s->diff_context > 0) {
5305 			s->diff_context--;
5306 			s->matched_line = 0;
5307 			diff_view_indicate_progress(view);
5308 			err = create_diff(s);
5309 			if (s->first_displayed_line + view->nlines - 1 >
5310 			    s->nlines) {
5311 				s->first_displayed_line = 1;
5312 				s->last_displayed_line = view->nlines;
5313 			}
5314 		} else
5315 			view->count = 0;
5316 		break;
5317 	case ']':
5318 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5319 			s->diff_context++;
5320 			s->matched_line = 0;
5321 			diff_view_indicate_progress(view);
5322 			err = create_diff(s);
5323 		} else
5324 			view->count = 0;
5325 		break;
5326 	case '<':
5327 	case ',':
5328 	case 'K':
5329 		up = 1;
5330 		/* FALL THROUGH */
5331 	case '>':
5332 	case '.':
5333 	case 'J':
5334 		if (s->parent_view == NULL) {
5335 			view->count = 0;
5336 			break;
5337 		}
5338 		s->parent_view->count = view->count;
5339 
5340 		if (s->parent_view->type == TOG_VIEW_LOG) {
5341 			ls = &s->parent_view->state.log;
5342 			old_selected_entry = ls->selected_entry;
5343 
5344 			err = input_log_view(NULL, s->parent_view,
5345 			    up ? KEY_UP : KEY_DOWN);
5346 			if (err)
5347 				break;
5348 			view->count = s->parent_view->count;
5349 
5350 			if (old_selected_entry == ls->selected_entry)
5351 				break;
5352 
5353 			err = set_selected_commit(s, ls->selected_entry);
5354 			if (err)
5355 				break;
5356 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5357 			struct tog_blame_view_state *bs;
5358 			struct got_object_id *id, *prev_id;
5359 
5360 			bs = &s->parent_view->state.blame;
5361 			prev_id = get_annotation_for_line(bs->blame.lines,
5362 			    bs->blame.nlines, bs->last_diffed_line);
5363 
5364 			err = input_blame_view(&view, s->parent_view,
5365 			    up ? KEY_UP : KEY_DOWN);
5366 			if (err)
5367 				break;
5368 			view->count = s->parent_view->count;
5369 
5370 			if (prev_id == NULL)
5371 				break;
5372 			id = get_selected_commit_id(bs->blame.lines,
5373 			    bs->blame.nlines, bs->first_displayed_line,
5374 			    bs->selected_line);
5375 			if (id == NULL)
5376 				break;
5377 
5378 			if (!got_object_id_cmp(prev_id, id))
5379 				break;
5380 
5381 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5382 			if (err)
5383 				break;
5384 		}
5385 		s->first_displayed_line = 1;
5386 		s->last_displayed_line = view->nlines;
5387 		s->matched_line = 0;
5388 		view->x = 0;
5389 
5390 		diff_view_indicate_progress(view);
5391 		err = create_diff(s);
5392 		break;
5393 	default:
5394 		view->count = 0;
5395 		break;
5396 	}
5397 
5398 	return err;
5399 }
5400 
5401 static const struct got_error *
5402 cmd_diff(int argc, char *argv[])
5403 {
5404 	const struct got_error *error = NULL;
5405 	struct got_repository *repo = NULL;
5406 	struct got_worktree *worktree = NULL;
5407 	struct got_object_id *id1 = NULL, *id2 = NULL;
5408 	char *repo_path = NULL, *cwd = NULL;
5409 	char *id_str1 = NULL, *id_str2 = NULL;
5410 	char *label1 = NULL, *label2 = NULL;
5411 	int diff_context = 3, ignore_whitespace = 0;
5412 	int ch, force_text_diff = 0;
5413 	const char *errstr;
5414 	struct tog_view *view;
5415 	int *pack_fds = NULL;
5416 
5417 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5418 		switch (ch) {
5419 		case 'a':
5420 			force_text_diff = 1;
5421 			break;
5422 		case 'C':
5423 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5424 			    &errstr);
5425 			if (errstr != NULL)
5426 				errx(1, "number of context lines is %s: %s",
5427 				    errstr, errstr);
5428 			break;
5429 		case 'r':
5430 			repo_path = realpath(optarg, NULL);
5431 			if (repo_path == NULL)
5432 				return got_error_from_errno2("realpath",
5433 				    optarg);
5434 			got_path_strip_trailing_slashes(repo_path);
5435 			break;
5436 		case 'w':
5437 			ignore_whitespace = 1;
5438 			break;
5439 		default:
5440 			usage_diff();
5441 			/* NOTREACHED */
5442 		}
5443 	}
5444 
5445 	argc -= optind;
5446 	argv += optind;
5447 
5448 	if (argc == 0) {
5449 		usage_diff(); /* TODO show local worktree changes */
5450 	} else if (argc == 2) {
5451 		id_str1 = argv[0];
5452 		id_str2 = argv[1];
5453 	} else
5454 		usage_diff();
5455 
5456 	error = got_repo_pack_fds_open(&pack_fds);
5457 	if (error)
5458 		goto done;
5459 
5460 	if (repo_path == NULL) {
5461 		cwd = getcwd(NULL, 0);
5462 		if (cwd == NULL)
5463 			return got_error_from_errno("getcwd");
5464 		error = got_worktree_open(&worktree, cwd);
5465 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5466 			goto done;
5467 		if (worktree)
5468 			repo_path =
5469 			    strdup(got_worktree_get_repo_path(worktree));
5470 		else
5471 			repo_path = strdup(cwd);
5472 		if (repo_path == NULL) {
5473 			error = got_error_from_errno("strdup");
5474 			goto done;
5475 		}
5476 	}
5477 
5478 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5479 	if (error)
5480 		goto done;
5481 
5482 	init_curses();
5483 
5484 	error = apply_unveil(got_repo_get_path(repo), NULL);
5485 	if (error)
5486 		goto done;
5487 
5488 	error = tog_load_refs(repo, 0);
5489 	if (error)
5490 		goto done;
5491 
5492 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5493 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5494 	if (error)
5495 		goto done;
5496 
5497 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5498 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5499 	if (error)
5500 		goto done;
5501 
5502 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5503 	if (view == NULL) {
5504 		error = got_error_from_errno("view_open");
5505 		goto done;
5506 	}
5507 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5508 	    ignore_whitespace, force_text_diff, NULL,  repo);
5509 	if (error)
5510 		goto done;
5511 	error = view_loop(view);
5512 done:
5513 	free(label1);
5514 	free(label2);
5515 	free(repo_path);
5516 	free(cwd);
5517 	if (repo) {
5518 		const struct got_error *close_err = got_repo_close(repo);
5519 		if (error == NULL)
5520 			error = close_err;
5521 	}
5522 	if (worktree)
5523 		got_worktree_close(worktree);
5524 	if (pack_fds) {
5525 		const struct got_error *pack_err =
5526 		    got_repo_pack_fds_close(pack_fds);
5527 		if (error == NULL)
5528 			error = pack_err;
5529 	}
5530 	tog_free_refs();
5531 	return error;
5532 }
5533 
5534 __dead static void
5535 usage_blame(void)
5536 {
5537 	endwin();
5538 	fprintf(stderr,
5539 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5540 	    getprogname());
5541 	exit(1);
5542 }
5543 
5544 struct tog_blame_line {
5545 	int annotated;
5546 	struct got_object_id *id;
5547 };
5548 
5549 static const struct got_error *
5550 draw_blame(struct tog_view *view)
5551 {
5552 	struct tog_blame_view_state *s = &view->state.blame;
5553 	struct tog_blame *blame = &s->blame;
5554 	regmatch_t *regmatch = &view->regmatch;
5555 	const struct got_error *err;
5556 	int lineno = 0, nprinted = 0;
5557 	char *line = NULL;
5558 	size_t linesize = 0;
5559 	ssize_t linelen;
5560 	wchar_t *wline;
5561 	int width;
5562 	struct tog_blame_line *blame_line;
5563 	struct got_object_id *prev_id = NULL;
5564 	char *id_str;
5565 	struct tog_color *tc;
5566 
5567 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5568 	if (err)
5569 		return err;
5570 
5571 	rewind(blame->f);
5572 	werase(view->window);
5573 
5574 	if (asprintf(&line, "commit %s", id_str) == -1) {
5575 		err = got_error_from_errno("asprintf");
5576 		free(id_str);
5577 		return err;
5578 	}
5579 
5580 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5581 	free(line);
5582 	line = NULL;
5583 	if (err)
5584 		return err;
5585 	if (view_needs_focus_indication(view))
5586 		wstandout(view->window);
5587 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5588 	if (tc)
5589 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5590 	waddwstr(view->window, wline);
5591 	while (width++ < view->ncols)
5592 		waddch(view->window, ' ');
5593 	if (tc)
5594 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5595 	if (view_needs_focus_indication(view))
5596 		wstandend(view->window);
5597 	free(wline);
5598 	wline = NULL;
5599 
5600 	if (view->gline > blame->nlines)
5601 		view->gline = blame->nlines;
5602 
5603 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5604 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5605 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5606 		free(id_str);
5607 		return got_error_from_errno("asprintf");
5608 	}
5609 	free(id_str);
5610 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5611 	free(line);
5612 	line = NULL;
5613 	if (err)
5614 		return err;
5615 	waddwstr(view->window, wline);
5616 	free(wline);
5617 	wline = NULL;
5618 	if (width < view->ncols - 1)
5619 		waddch(view->window, '\n');
5620 
5621 	s->eof = 0;
5622 	view->maxx = 0;
5623 	while (nprinted < view->nlines - 2) {
5624 		linelen = getline(&line, &linesize, blame->f);
5625 		if (linelen == -1) {
5626 			if (feof(blame->f)) {
5627 				s->eof = 1;
5628 				break;
5629 			}
5630 			free(line);
5631 			return got_ferror(blame->f, GOT_ERR_IO);
5632 		}
5633 		if (++lineno < s->first_displayed_line)
5634 			continue;
5635 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5636 			continue;
5637 
5638 		/* Set view->maxx based on full line length. */
5639 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5640 		if (err) {
5641 			free(line);
5642 			return err;
5643 		}
5644 		free(wline);
5645 		wline = NULL;
5646 		view->maxx = MAX(view->maxx, width);
5647 
5648 		if (nprinted == s->selected_line - 1)
5649 			wstandout(view->window);
5650 
5651 		if (blame->nlines > 0) {
5652 			blame_line = &blame->lines[lineno - 1];
5653 			if (blame_line->annotated && prev_id &&
5654 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5655 			    !(nprinted == s->selected_line - 1)) {
5656 				waddstr(view->window, "        ");
5657 			} else if (blame_line->annotated) {
5658 				char *id_str;
5659 				err = got_object_id_str(&id_str,
5660 				    blame_line->id);
5661 				if (err) {
5662 					free(line);
5663 					return err;
5664 				}
5665 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5666 				if (tc)
5667 					wattr_on(view->window,
5668 					    COLOR_PAIR(tc->colorpair), NULL);
5669 				wprintw(view->window, "%.8s", id_str);
5670 				if (tc)
5671 					wattr_off(view->window,
5672 					    COLOR_PAIR(tc->colorpair), NULL);
5673 				free(id_str);
5674 				prev_id = blame_line->id;
5675 			} else {
5676 				waddstr(view->window, "........");
5677 				prev_id = NULL;
5678 			}
5679 		} else {
5680 			waddstr(view->window, "........");
5681 			prev_id = NULL;
5682 		}
5683 
5684 		if (nprinted == s->selected_line - 1)
5685 			wstandend(view->window);
5686 		waddstr(view->window, " ");
5687 
5688 		if (view->ncols <= 9) {
5689 			width = 9;
5690 		} else if (s->first_displayed_line + nprinted ==
5691 		    s->matched_line &&
5692 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5693 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5694 			    view->window, view->x, regmatch);
5695 			if (err) {
5696 				free(line);
5697 				return err;
5698 			}
5699 			width += 9;
5700 		} else {
5701 			int skip;
5702 			err = format_line(&wline, &width, &skip, line,
5703 			    view->x, view->ncols - 9, 9, 1);
5704 			if (err) {
5705 				free(line);
5706 				return err;
5707 			}
5708 			waddwstr(view->window, &wline[skip]);
5709 			width += 9;
5710 			free(wline);
5711 			wline = NULL;
5712 		}
5713 
5714 		if (width <= view->ncols - 1)
5715 			waddch(view->window, '\n');
5716 		if (++nprinted == 1)
5717 			s->first_displayed_line = lineno;
5718 	}
5719 	free(line);
5720 	s->last_displayed_line = lineno;
5721 
5722 	view_border(view);
5723 
5724 	return NULL;
5725 }
5726 
5727 static const struct got_error *
5728 blame_cb(void *arg, int nlines, int lineno,
5729     struct got_commit_object *commit, struct got_object_id *id)
5730 {
5731 	const struct got_error *err = NULL;
5732 	struct tog_blame_cb_args *a = arg;
5733 	struct tog_blame_line *line;
5734 	int errcode;
5735 
5736 	if (nlines != a->nlines ||
5737 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5738 		return got_error(GOT_ERR_RANGE);
5739 
5740 	errcode = pthread_mutex_lock(&tog_mutex);
5741 	if (errcode)
5742 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5743 
5744 	if (*a->quit) {	/* user has quit the blame view */
5745 		err = got_error(GOT_ERR_ITER_COMPLETED);
5746 		goto done;
5747 	}
5748 
5749 	if (lineno == -1)
5750 		goto done; /* no change in this commit */
5751 
5752 	line = &a->lines[lineno - 1];
5753 	if (line->annotated)
5754 		goto done;
5755 
5756 	line->id = got_object_id_dup(id);
5757 	if (line->id == NULL) {
5758 		err = got_error_from_errno("got_object_id_dup");
5759 		goto done;
5760 	}
5761 	line->annotated = 1;
5762 done:
5763 	errcode = pthread_mutex_unlock(&tog_mutex);
5764 	if (errcode)
5765 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5766 	return err;
5767 }
5768 
5769 static void *
5770 blame_thread(void *arg)
5771 {
5772 	const struct got_error *err, *close_err;
5773 	struct tog_blame_thread_args *ta = arg;
5774 	struct tog_blame_cb_args *a = ta->cb_args;
5775 	int errcode, fd1 = -1, fd2 = -1;
5776 	FILE *f1 = NULL, *f2 = NULL;
5777 
5778 	fd1 = got_opentempfd();
5779 	if (fd1 == -1)
5780 		return (void *)got_error_from_errno("got_opentempfd");
5781 
5782 	fd2 = got_opentempfd();
5783 	if (fd2 == -1) {
5784 		err = got_error_from_errno("got_opentempfd");
5785 		goto done;
5786 	}
5787 
5788 	f1 = got_opentemp();
5789 	if (f1 == NULL) {
5790 		err = (void *)got_error_from_errno("got_opentemp");
5791 		goto done;
5792 	}
5793 	f2 = got_opentemp();
5794 	if (f2 == NULL) {
5795 		err = (void *)got_error_from_errno("got_opentemp");
5796 		goto done;
5797 	}
5798 
5799 	err = block_signals_used_by_main_thread();
5800 	if (err)
5801 		goto done;
5802 
5803 	err = got_blame(ta->path, a->commit_id, ta->repo,
5804 	    tog_diff_algo, blame_cb, ta->cb_args,
5805 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5806 	if (err && err->code == GOT_ERR_CANCELLED)
5807 		err = NULL;
5808 
5809 	errcode = pthread_mutex_lock(&tog_mutex);
5810 	if (errcode) {
5811 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5812 		goto done;
5813 	}
5814 
5815 	close_err = got_repo_close(ta->repo);
5816 	if (err == NULL)
5817 		err = close_err;
5818 	ta->repo = NULL;
5819 	*ta->complete = 1;
5820 
5821 	errcode = pthread_mutex_unlock(&tog_mutex);
5822 	if (errcode && err == NULL)
5823 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5824 
5825 done:
5826 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5827 		err = got_error_from_errno("close");
5828 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5829 		err = got_error_from_errno("close");
5830 	if (f1 && fclose(f1) == EOF && err == NULL)
5831 		err = got_error_from_errno("fclose");
5832 	if (f2 && fclose(f2) == EOF && err == NULL)
5833 		err = got_error_from_errno("fclose");
5834 
5835 	return (void *)err;
5836 }
5837 
5838 static struct got_object_id *
5839 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5840     int first_displayed_line, int selected_line)
5841 {
5842 	struct tog_blame_line *line;
5843 
5844 	if (nlines <= 0)
5845 		return NULL;
5846 
5847 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5848 	if (!line->annotated)
5849 		return NULL;
5850 
5851 	return line->id;
5852 }
5853 
5854 static struct got_object_id *
5855 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5856     int lineno)
5857 {
5858 	struct tog_blame_line *line;
5859 
5860 	if (nlines <= 0 || lineno >= nlines)
5861 		return NULL;
5862 
5863 	line = &lines[lineno - 1];
5864 	if (!line->annotated)
5865 		return NULL;
5866 
5867 	return line->id;
5868 }
5869 
5870 static const struct got_error *
5871 stop_blame(struct tog_blame *blame)
5872 {
5873 	const struct got_error *err = NULL;
5874 	int i;
5875 
5876 	if (blame->thread) {
5877 		int errcode;
5878 		errcode = pthread_mutex_unlock(&tog_mutex);
5879 		if (errcode)
5880 			return got_error_set_errno(errcode,
5881 			    "pthread_mutex_unlock");
5882 		errcode = pthread_join(blame->thread, (void **)&err);
5883 		if (errcode)
5884 			return got_error_set_errno(errcode, "pthread_join");
5885 		errcode = pthread_mutex_lock(&tog_mutex);
5886 		if (errcode)
5887 			return got_error_set_errno(errcode,
5888 			    "pthread_mutex_lock");
5889 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5890 			err = NULL;
5891 		blame->thread = NULL;
5892 	}
5893 	if (blame->thread_args.repo) {
5894 		const struct got_error *close_err;
5895 		close_err = got_repo_close(blame->thread_args.repo);
5896 		if (err == NULL)
5897 			err = close_err;
5898 		blame->thread_args.repo = NULL;
5899 	}
5900 	if (blame->f) {
5901 		if (fclose(blame->f) == EOF && err == NULL)
5902 			err = got_error_from_errno("fclose");
5903 		blame->f = NULL;
5904 	}
5905 	if (blame->lines) {
5906 		for (i = 0; i < blame->nlines; i++)
5907 			free(blame->lines[i].id);
5908 		free(blame->lines);
5909 		blame->lines = NULL;
5910 	}
5911 	free(blame->cb_args.commit_id);
5912 	blame->cb_args.commit_id = NULL;
5913 	if (blame->pack_fds) {
5914 		const struct got_error *pack_err =
5915 		    got_repo_pack_fds_close(blame->pack_fds);
5916 		if (err == NULL)
5917 			err = pack_err;
5918 		blame->pack_fds = NULL;
5919 	}
5920 	return err;
5921 }
5922 
5923 static const struct got_error *
5924 cancel_blame_view(void *arg)
5925 {
5926 	const struct got_error *err = NULL;
5927 	int *done = arg;
5928 	int errcode;
5929 
5930 	errcode = pthread_mutex_lock(&tog_mutex);
5931 	if (errcode)
5932 		return got_error_set_errno(errcode,
5933 		    "pthread_mutex_unlock");
5934 
5935 	if (*done)
5936 		err = got_error(GOT_ERR_CANCELLED);
5937 
5938 	errcode = pthread_mutex_unlock(&tog_mutex);
5939 	if (errcode)
5940 		return got_error_set_errno(errcode,
5941 		    "pthread_mutex_lock");
5942 
5943 	return err;
5944 }
5945 
5946 static const struct got_error *
5947 run_blame(struct tog_view *view)
5948 {
5949 	struct tog_blame_view_state *s = &view->state.blame;
5950 	struct tog_blame *blame = &s->blame;
5951 	const struct got_error *err = NULL;
5952 	struct got_commit_object *commit = NULL;
5953 	struct got_blob_object *blob = NULL;
5954 	struct got_repository *thread_repo = NULL;
5955 	struct got_object_id *obj_id = NULL;
5956 	int obj_type, fd = -1;
5957 	int *pack_fds = NULL;
5958 
5959 	err = got_object_open_as_commit(&commit, s->repo,
5960 	    &s->blamed_commit->id);
5961 	if (err)
5962 		return err;
5963 
5964 	fd = got_opentempfd();
5965 	if (fd == -1) {
5966 		err = got_error_from_errno("got_opentempfd");
5967 		goto done;
5968 	}
5969 
5970 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5971 	if (err)
5972 		goto done;
5973 
5974 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5975 	if (err)
5976 		goto done;
5977 
5978 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5979 		err = got_error(GOT_ERR_OBJ_TYPE);
5980 		goto done;
5981 	}
5982 
5983 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5984 	if (err)
5985 		goto done;
5986 	blame->f = got_opentemp();
5987 	if (blame->f == NULL) {
5988 		err = got_error_from_errno("got_opentemp");
5989 		goto done;
5990 	}
5991 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5992 	    &blame->line_offsets, blame->f, blob);
5993 	if (err)
5994 		goto done;
5995 	if (blame->nlines == 0) {
5996 		s->blame_complete = 1;
5997 		goto done;
5998 	}
5999 
6000 	/* Don't include \n at EOF in the blame line count. */
6001 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6002 		blame->nlines--;
6003 
6004 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6005 	if (blame->lines == NULL) {
6006 		err = got_error_from_errno("calloc");
6007 		goto done;
6008 	}
6009 
6010 	err = got_repo_pack_fds_open(&pack_fds);
6011 	if (err)
6012 		goto done;
6013 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6014 	    pack_fds);
6015 	if (err)
6016 		goto done;
6017 
6018 	blame->pack_fds = pack_fds;
6019 	blame->cb_args.view = view;
6020 	blame->cb_args.lines = blame->lines;
6021 	blame->cb_args.nlines = blame->nlines;
6022 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6023 	if (blame->cb_args.commit_id == NULL) {
6024 		err = got_error_from_errno("got_object_id_dup");
6025 		goto done;
6026 	}
6027 	blame->cb_args.quit = &s->done;
6028 
6029 	blame->thread_args.path = s->path;
6030 	blame->thread_args.repo = thread_repo;
6031 	blame->thread_args.cb_args = &blame->cb_args;
6032 	blame->thread_args.complete = &s->blame_complete;
6033 	blame->thread_args.cancel_cb = cancel_blame_view;
6034 	blame->thread_args.cancel_arg = &s->done;
6035 	s->blame_complete = 0;
6036 
6037 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6038 		s->first_displayed_line = 1;
6039 		s->last_displayed_line = view->nlines;
6040 		s->selected_line = 1;
6041 	}
6042 	s->matched_line = 0;
6043 
6044 done:
6045 	if (commit)
6046 		got_object_commit_close(commit);
6047 	if (fd != -1 && close(fd) == -1 && err == NULL)
6048 		err = got_error_from_errno("close");
6049 	if (blob)
6050 		got_object_blob_close(blob);
6051 	free(obj_id);
6052 	if (err)
6053 		stop_blame(blame);
6054 	return err;
6055 }
6056 
6057 static const struct got_error *
6058 open_blame_view(struct tog_view *view, char *path,
6059     struct got_object_id *commit_id, struct got_repository *repo)
6060 {
6061 	const struct got_error *err = NULL;
6062 	struct tog_blame_view_state *s = &view->state.blame;
6063 
6064 	STAILQ_INIT(&s->blamed_commits);
6065 
6066 	s->path = strdup(path);
6067 	if (s->path == NULL)
6068 		return got_error_from_errno("strdup");
6069 
6070 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6071 	if (err) {
6072 		free(s->path);
6073 		return err;
6074 	}
6075 
6076 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6077 	s->first_displayed_line = 1;
6078 	s->last_displayed_line = view->nlines;
6079 	s->selected_line = 1;
6080 	s->blame_complete = 0;
6081 	s->repo = repo;
6082 	s->commit_id = commit_id;
6083 	memset(&s->blame, 0, sizeof(s->blame));
6084 
6085 	STAILQ_INIT(&s->colors);
6086 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6087 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6088 		    get_color_value("TOG_COLOR_COMMIT"));
6089 		if (err)
6090 			return err;
6091 	}
6092 
6093 	view->show = show_blame_view;
6094 	view->input = input_blame_view;
6095 	view->reset = reset_blame_view;
6096 	view->close = close_blame_view;
6097 	view->search_start = search_start_blame_view;
6098 	view->search_setup = search_setup_blame_view;
6099 	view->search_next = search_next_view_match;
6100 
6101 	return run_blame(view);
6102 }
6103 
6104 static const struct got_error *
6105 close_blame_view(struct tog_view *view)
6106 {
6107 	const struct got_error *err = NULL;
6108 	struct tog_blame_view_state *s = &view->state.blame;
6109 
6110 	if (s->blame.thread)
6111 		err = stop_blame(&s->blame);
6112 
6113 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6114 		struct got_object_qid *blamed_commit;
6115 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6116 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6117 		got_object_qid_free(blamed_commit);
6118 	}
6119 
6120 	free(s->path);
6121 	free_colors(&s->colors);
6122 	return err;
6123 }
6124 
6125 static const struct got_error *
6126 search_start_blame_view(struct tog_view *view)
6127 {
6128 	struct tog_blame_view_state *s = &view->state.blame;
6129 
6130 	s->matched_line = 0;
6131 	return NULL;
6132 }
6133 
6134 static void
6135 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6136     size_t *nlines, int **first, int **last, int **match, int **selected)
6137 {
6138 	struct tog_blame_view_state *s = &view->state.blame;
6139 
6140 	*f = s->blame.f;
6141 	*nlines = s->blame.nlines;
6142 	*line_offsets = s->blame.line_offsets;
6143 	*match = &s->matched_line;
6144 	*first = &s->first_displayed_line;
6145 	*last = &s->last_displayed_line;
6146 	*selected = &s->selected_line;
6147 }
6148 
6149 static const struct got_error *
6150 show_blame_view(struct tog_view *view)
6151 {
6152 	const struct got_error *err = NULL;
6153 	struct tog_blame_view_state *s = &view->state.blame;
6154 	int errcode;
6155 
6156 	if (s->blame.thread == NULL && !s->blame_complete) {
6157 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6158 		    &s->blame.thread_args);
6159 		if (errcode)
6160 			return got_error_set_errno(errcode, "pthread_create");
6161 
6162 		halfdelay(1); /* fast refresh while annotating  */
6163 	}
6164 
6165 	if (s->blame_complete)
6166 		halfdelay(10); /* disable fast refresh */
6167 
6168 	err = draw_blame(view);
6169 
6170 	view_border(view);
6171 	return err;
6172 }
6173 
6174 static const struct got_error *
6175 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6176     struct got_repository *repo, struct got_object_id *id)
6177 {
6178 	struct tog_view		*log_view;
6179 	const struct got_error	*err = NULL;
6180 
6181 	*new_view = NULL;
6182 
6183 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6184 	if (log_view == NULL)
6185 		return got_error_from_errno("view_open");
6186 
6187 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6188 	if (err)
6189 		view_close(log_view);
6190 	else
6191 		*new_view = log_view;
6192 
6193 	return err;
6194 }
6195 
6196 static const struct got_error *
6197 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6198 {
6199 	const struct got_error *err = NULL, *thread_err = NULL;
6200 	struct tog_view *diff_view;
6201 	struct tog_blame_view_state *s = &view->state.blame;
6202 	int eos, nscroll, begin_y = 0, begin_x = 0;
6203 
6204 	eos = nscroll = view->nlines - 2;
6205 	if (view_is_hsplit_top(view))
6206 		--eos;  /* border */
6207 
6208 	switch (ch) {
6209 	case '0':
6210 		view->x = 0;
6211 		break;
6212 	case '$':
6213 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6214 		view->count = 0;
6215 		break;
6216 	case KEY_RIGHT:
6217 	case 'l':
6218 		if (view->x + view->ncols / 3 < view->maxx)
6219 			view->x += 2;  /* move two columns right */
6220 		else
6221 			view->count = 0;
6222 		break;
6223 	case KEY_LEFT:
6224 	case 'h':
6225 		view->x -= MIN(view->x, 2);  /* move two columns back */
6226 		if (view->x <= 0)
6227 			view->count = 0;
6228 		break;
6229 	case 'q':
6230 		s->done = 1;
6231 		break;
6232 	case 'g':
6233 	case KEY_HOME:
6234 		s->selected_line = 1;
6235 		s->first_displayed_line = 1;
6236 		view->count = 0;
6237 		break;
6238 	case 'G':
6239 	case KEY_END:
6240 		if (s->blame.nlines < eos) {
6241 			s->selected_line = s->blame.nlines;
6242 			s->first_displayed_line = 1;
6243 		} else {
6244 			s->selected_line = eos;
6245 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6246 		}
6247 		view->count = 0;
6248 		break;
6249 	case 'k':
6250 	case KEY_UP:
6251 	case CTRL('p'):
6252 		if (s->selected_line > 1)
6253 			s->selected_line--;
6254 		else if (s->selected_line == 1 &&
6255 		    s->first_displayed_line > 1)
6256 			s->first_displayed_line--;
6257 		else
6258 			view->count = 0;
6259 		break;
6260 	case CTRL('u'):
6261 	case 'u':
6262 		nscroll /= 2;
6263 		/* FALL THROUGH */
6264 	case KEY_PPAGE:
6265 	case CTRL('b'):
6266 	case 'b':
6267 		if (s->first_displayed_line == 1) {
6268 			if (view->count > 1)
6269 				nscroll += nscroll;
6270 			s->selected_line = MAX(1, s->selected_line - nscroll);
6271 			view->count = 0;
6272 			break;
6273 		}
6274 		if (s->first_displayed_line > nscroll)
6275 			s->first_displayed_line -= nscroll;
6276 		else
6277 			s->first_displayed_line = 1;
6278 		break;
6279 	case 'j':
6280 	case KEY_DOWN:
6281 	case CTRL('n'):
6282 		if (s->selected_line < eos && s->first_displayed_line +
6283 		    s->selected_line <= s->blame.nlines)
6284 			s->selected_line++;
6285 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6286 			s->first_displayed_line++;
6287 		else
6288 			view->count = 0;
6289 		break;
6290 	case 'c':
6291 	case 'p': {
6292 		struct got_object_id *id = NULL;
6293 
6294 		view->count = 0;
6295 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6296 		    s->first_displayed_line, s->selected_line);
6297 		if (id == NULL)
6298 			break;
6299 		if (ch == 'p') {
6300 			struct got_commit_object *commit, *pcommit;
6301 			struct got_object_qid *pid;
6302 			struct got_object_id *blob_id = NULL;
6303 			int obj_type;
6304 			err = got_object_open_as_commit(&commit,
6305 			    s->repo, id);
6306 			if (err)
6307 				break;
6308 			pid = STAILQ_FIRST(
6309 			    got_object_commit_get_parent_ids(commit));
6310 			if (pid == NULL) {
6311 				got_object_commit_close(commit);
6312 				break;
6313 			}
6314 			/* Check if path history ends here. */
6315 			err = got_object_open_as_commit(&pcommit,
6316 			    s->repo, &pid->id);
6317 			if (err)
6318 				break;
6319 			err = got_object_id_by_path(&blob_id, s->repo,
6320 			    pcommit, s->path);
6321 			got_object_commit_close(pcommit);
6322 			if (err) {
6323 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6324 					err = NULL;
6325 				got_object_commit_close(commit);
6326 				break;
6327 			}
6328 			err = got_object_get_type(&obj_type, s->repo,
6329 			    blob_id);
6330 			free(blob_id);
6331 			/* Can't blame non-blob type objects. */
6332 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6333 				got_object_commit_close(commit);
6334 				break;
6335 			}
6336 			err = got_object_qid_alloc(&s->blamed_commit,
6337 			    &pid->id);
6338 			got_object_commit_close(commit);
6339 		} else {
6340 			if (got_object_id_cmp(id,
6341 			    &s->blamed_commit->id) == 0)
6342 				break;
6343 			err = got_object_qid_alloc(&s->blamed_commit,
6344 			    id);
6345 		}
6346 		if (err)
6347 			break;
6348 		s->done = 1;
6349 		thread_err = stop_blame(&s->blame);
6350 		s->done = 0;
6351 		if (thread_err)
6352 			break;
6353 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6354 		    s->blamed_commit, entry);
6355 		err = run_blame(view);
6356 		if (err)
6357 			break;
6358 		break;
6359 	}
6360 	case 'C': {
6361 		struct got_object_qid *first;
6362 
6363 		view->count = 0;
6364 		first = STAILQ_FIRST(&s->blamed_commits);
6365 		if (!got_object_id_cmp(&first->id, s->commit_id))
6366 			break;
6367 		s->done = 1;
6368 		thread_err = stop_blame(&s->blame);
6369 		s->done = 0;
6370 		if (thread_err)
6371 			break;
6372 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6373 		got_object_qid_free(s->blamed_commit);
6374 		s->blamed_commit =
6375 		    STAILQ_FIRST(&s->blamed_commits);
6376 		err = run_blame(view);
6377 		if (err)
6378 			break;
6379 		break;
6380 	}
6381 	case 'L':
6382 		view->count = 0;
6383 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6384 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6385 		if (s->id_to_log)
6386 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6387 		break;
6388 	case KEY_ENTER:
6389 	case '\r': {
6390 		struct got_object_id *id = NULL;
6391 		struct got_object_qid *pid;
6392 		struct got_commit_object *commit = NULL;
6393 
6394 		view->count = 0;
6395 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6396 		    s->first_displayed_line, s->selected_line);
6397 		if (id == NULL)
6398 			break;
6399 		err = got_object_open_as_commit(&commit, s->repo, id);
6400 		if (err)
6401 			break;
6402 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6403 		if (*new_view) {
6404 			/* traversed from diff view, release diff resources  */
6405 			err = close_diff_view(*new_view);
6406 			if (err)
6407 				break;
6408 			diff_view = *new_view;
6409 		} else {
6410 			if (view_is_parent_view(view))
6411 				view_get_split(view, &begin_y, &begin_x);
6412 
6413 			diff_view = view_open(0, 0, begin_y, begin_x,
6414 			    TOG_VIEW_DIFF);
6415 			if (diff_view == NULL) {
6416 				got_object_commit_close(commit);
6417 				err = got_error_from_errno("view_open");
6418 				break;
6419 			}
6420 		}
6421 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6422 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6423 		got_object_commit_close(commit);
6424 		if (err) {
6425 			view_close(diff_view);
6426 			break;
6427 		}
6428 		s->last_diffed_line = s->first_displayed_line - 1 +
6429 		    s->selected_line;
6430 		if (*new_view)
6431 			break;	/* still open from active diff view */
6432 		if (view_is_parent_view(view) &&
6433 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6434 			err = view_init_hsplit(view, begin_y);
6435 			if (err)
6436 				break;
6437 		}
6438 
6439 		view->focussed = 0;
6440 		diff_view->focussed = 1;
6441 		diff_view->mode = view->mode;
6442 		diff_view->nlines = view->lines - begin_y;
6443 		if (view_is_parent_view(view)) {
6444 			view_transfer_size(diff_view, view);
6445 			err = view_close_child(view);
6446 			if (err)
6447 				break;
6448 			err = view_set_child(view, diff_view);
6449 			if (err)
6450 				break;
6451 			view->focus_child = 1;
6452 		} else
6453 			*new_view = diff_view;
6454 		if (err)
6455 			break;
6456 		break;
6457 	}
6458 	case CTRL('d'):
6459 	case 'd':
6460 		nscroll /= 2;
6461 		/* FALL THROUGH */
6462 	case KEY_NPAGE:
6463 	case CTRL('f'):
6464 	case 'f':
6465 	case ' ':
6466 		if (s->last_displayed_line >= s->blame.nlines &&
6467 		    s->selected_line >= MIN(s->blame.nlines,
6468 		    view->nlines - 2)) {
6469 			view->count = 0;
6470 			break;
6471 		}
6472 		if (s->last_displayed_line >= s->blame.nlines &&
6473 		    s->selected_line < view->nlines - 2) {
6474 			s->selected_line +=
6475 			    MIN(nscroll, s->last_displayed_line -
6476 			    s->first_displayed_line - s->selected_line + 1);
6477 		}
6478 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6479 			s->first_displayed_line += nscroll;
6480 		else
6481 			s->first_displayed_line =
6482 			    s->blame.nlines - (view->nlines - 3);
6483 		break;
6484 	case KEY_RESIZE:
6485 		if (s->selected_line > view->nlines - 2) {
6486 			s->selected_line = MIN(s->blame.nlines,
6487 			    view->nlines - 2);
6488 		}
6489 		break;
6490 	default:
6491 		view->count = 0;
6492 		break;
6493 	}
6494 	return thread_err ? thread_err : err;
6495 }
6496 
6497 static const struct got_error *
6498 reset_blame_view(struct tog_view *view)
6499 {
6500 	const struct got_error *err;
6501 	struct tog_blame_view_state *s = &view->state.blame;
6502 
6503 	view->count = 0;
6504 	s->done = 1;
6505 	err = stop_blame(&s->blame);
6506 	s->done = 0;
6507 	if (err)
6508 		return err;
6509 	return run_blame(view);
6510 }
6511 
6512 static const struct got_error *
6513 cmd_blame(int argc, char *argv[])
6514 {
6515 	const struct got_error *error;
6516 	struct got_repository *repo = NULL;
6517 	struct got_worktree *worktree = NULL;
6518 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6519 	char *link_target = NULL;
6520 	struct got_object_id *commit_id = NULL;
6521 	struct got_commit_object *commit = NULL;
6522 	char *commit_id_str = NULL;
6523 	int ch;
6524 	struct tog_view *view;
6525 	int *pack_fds = NULL;
6526 
6527 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6528 		switch (ch) {
6529 		case 'c':
6530 			commit_id_str = optarg;
6531 			break;
6532 		case 'r':
6533 			repo_path = realpath(optarg, NULL);
6534 			if (repo_path == NULL)
6535 				return got_error_from_errno2("realpath",
6536 				    optarg);
6537 			break;
6538 		default:
6539 			usage_blame();
6540 			/* NOTREACHED */
6541 		}
6542 	}
6543 
6544 	argc -= optind;
6545 	argv += optind;
6546 
6547 	if (argc != 1)
6548 		usage_blame();
6549 
6550 	error = got_repo_pack_fds_open(&pack_fds);
6551 	if (error != NULL)
6552 		goto done;
6553 
6554 	if (repo_path == NULL) {
6555 		cwd = getcwd(NULL, 0);
6556 		if (cwd == NULL)
6557 			return got_error_from_errno("getcwd");
6558 		error = got_worktree_open(&worktree, cwd);
6559 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6560 			goto done;
6561 		if (worktree)
6562 			repo_path =
6563 			    strdup(got_worktree_get_repo_path(worktree));
6564 		else
6565 			repo_path = strdup(cwd);
6566 		if (repo_path == NULL) {
6567 			error = got_error_from_errno("strdup");
6568 			goto done;
6569 		}
6570 	}
6571 
6572 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6573 	if (error != NULL)
6574 		goto done;
6575 
6576 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6577 	    worktree);
6578 	if (error)
6579 		goto done;
6580 
6581 	init_curses();
6582 
6583 	error = apply_unveil(got_repo_get_path(repo), NULL);
6584 	if (error)
6585 		goto done;
6586 
6587 	error = tog_load_refs(repo, 0);
6588 	if (error)
6589 		goto done;
6590 
6591 	if (commit_id_str == NULL) {
6592 		struct got_reference *head_ref;
6593 		error = got_ref_open(&head_ref, repo, worktree ?
6594 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6595 		if (error != NULL)
6596 			goto done;
6597 		error = got_ref_resolve(&commit_id, repo, head_ref);
6598 		got_ref_close(head_ref);
6599 	} else {
6600 		error = got_repo_match_object_id(&commit_id, NULL,
6601 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6602 	}
6603 	if (error != NULL)
6604 		goto done;
6605 
6606 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6607 	if (view == NULL) {
6608 		error = got_error_from_errno("view_open");
6609 		goto done;
6610 	}
6611 
6612 	error = got_object_open_as_commit(&commit, repo, commit_id);
6613 	if (error)
6614 		goto done;
6615 
6616 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6617 	    commit, repo);
6618 	if (error)
6619 		goto done;
6620 
6621 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6622 	    commit_id, repo);
6623 	if (error)
6624 		goto done;
6625 	if (worktree) {
6626 		/* Release work tree lock. */
6627 		got_worktree_close(worktree);
6628 		worktree = NULL;
6629 	}
6630 	error = view_loop(view);
6631 done:
6632 	free(repo_path);
6633 	free(in_repo_path);
6634 	free(link_target);
6635 	free(cwd);
6636 	free(commit_id);
6637 	if (commit)
6638 		got_object_commit_close(commit);
6639 	if (worktree)
6640 		got_worktree_close(worktree);
6641 	if (repo) {
6642 		const struct got_error *close_err = got_repo_close(repo);
6643 		if (error == NULL)
6644 			error = close_err;
6645 	}
6646 	if (pack_fds) {
6647 		const struct got_error *pack_err =
6648 		    got_repo_pack_fds_close(pack_fds);
6649 		if (error == NULL)
6650 			error = pack_err;
6651 	}
6652 	tog_free_refs();
6653 	return error;
6654 }
6655 
6656 static const struct got_error *
6657 draw_tree_entries(struct tog_view *view, const char *parent_path)
6658 {
6659 	struct tog_tree_view_state *s = &view->state.tree;
6660 	const struct got_error *err = NULL;
6661 	struct got_tree_entry *te;
6662 	wchar_t *wline;
6663 	char *index = NULL;
6664 	struct tog_color *tc;
6665 	int width, n, nentries, i = 1;
6666 	int limit = view->nlines;
6667 
6668 	s->ndisplayed = 0;
6669 	if (view_is_hsplit_top(view))
6670 		--limit;  /* border */
6671 
6672 	werase(view->window);
6673 
6674 	if (limit == 0)
6675 		return NULL;
6676 
6677 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6678 	    0, 0);
6679 	if (err)
6680 		return err;
6681 	if (view_needs_focus_indication(view))
6682 		wstandout(view->window);
6683 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6684 	if (tc)
6685 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6686 	waddwstr(view->window, wline);
6687 	free(wline);
6688 	wline = NULL;
6689 	while (width++ < view->ncols)
6690 		waddch(view->window, ' ');
6691 	if (tc)
6692 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6693 	if (view_needs_focus_indication(view))
6694 		wstandend(view->window);
6695 	if (--limit <= 0)
6696 		return NULL;
6697 
6698 	i += s->selected;
6699 	if (s->first_displayed_entry) {
6700 		i += got_tree_entry_get_index(s->first_displayed_entry);
6701 		if (s->tree != s->root)
6702 			++i;  /* account for ".." entry */
6703 	}
6704 	nentries = got_object_tree_get_nentries(s->tree);
6705 	if (asprintf(&index, "[%d/%d] %s",
6706 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6707 		return got_error_from_errno("asprintf");
6708 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6709 	free(index);
6710 	if (err)
6711 		return err;
6712 	waddwstr(view->window, wline);
6713 	free(wline);
6714 	wline = NULL;
6715 	if (width < view->ncols - 1)
6716 		waddch(view->window, '\n');
6717 	if (--limit <= 0)
6718 		return NULL;
6719 	waddch(view->window, '\n');
6720 	if (--limit <= 0)
6721 		return NULL;
6722 
6723 	if (s->first_displayed_entry == NULL) {
6724 		te = got_object_tree_get_first_entry(s->tree);
6725 		if (s->selected == 0) {
6726 			if (view->focussed)
6727 				wstandout(view->window);
6728 			s->selected_entry = NULL;
6729 		}
6730 		waddstr(view->window, "  ..\n");	/* parent directory */
6731 		if (s->selected == 0 && view->focussed)
6732 			wstandend(view->window);
6733 		s->ndisplayed++;
6734 		if (--limit <= 0)
6735 			return NULL;
6736 		n = 1;
6737 	} else {
6738 		n = 0;
6739 		te = s->first_displayed_entry;
6740 	}
6741 
6742 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6743 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6744 		const char *modestr = "";
6745 		mode_t mode;
6746 
6747 		te = got_object_tree_get_entry(s->tree, i);
6748 		mode = got_tree_entry_get_mode(te);
6749 
6750 		if (s->show_ids) {
6751 			err = got_object_id_str(&id_str,
6752 			    got_tree_entry_get_id(te));
6753 			if (err)
6754 				return got_error_from_errno(
6755 				    "got_object_id_str");
6756 		}
6757 		if (got_object_tree_entry_is_submodule(te))
6758 			modestr = "$";
6759 		else if (S_ISLNK(mode)) {
6760 			int i;
6761 
6762 			err = got_tree_entry_get_symlink_target(&link_target,
6763 			    te, s->repo);
6764 			if (err) {
6765 				free(id_str);
6766 				return err;
6767 			}
6768 			for (i = 0; i < strlen(link_target); i++) {
6769 				if (!isprint((unsigned char)link_target[i]))
6770 					link_target[i] = '?';
6771 			}
6772 			modestr = "@";
6773 		}
6774 		else if (S_ISDIR(mode))
6775 			modestr = "/";
6776 		else if (mode & S_IXUSR)
6777 			modestr = "*";
6778 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6779 		    got_tree_entry_get_name(te), modestr,
6780 		    link_target ? " -> ": "",
6781 		    link_target ? link_target : "") == -1) {
6782 			free(id_str);
6783 			free(link_target);
6784 			return got_error_from_errno("asprintf");
6785 		}
6786 		free(id_str);
6787 		free(link_target);
6788 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6789 		    0, 0);
6790 		if (err) {
6791 			free(line);
6792 			break;
6793 		}
6794 		if (n == s->selected) {
6795 			if (view->focussed)
6796 				wstandout(view->window);
6797 			s->selected_entry = te;
6798 		}
6799 		tc = match_color(&s->colors, line);
6800 		if (tc)
6801 			wattr_on(view->window,
6802 			    COLOR_PAIR(tc->colorpair), NULL);
6803 		waddwstr(view->window, wline);
6804 		if (tc)
6805 			wattr_off(view->window,
6806 			    COLOR_PAIR(tc->colorpair), NULL);
6807 		if (width < view->ncols - 1)
6808 			waddch(view->window, '\n');
6809 		if (n == s->selected && view->focussed)
6810 			wstandend(view->window);
6811 		free(line);
6812 		free(wline);
6813 		wline = NULL;
6814 		n++;
6815 		s->ndisplayed++;
6816 		s->last_displayed_entry = te;
6817 		if (--limit <= 0)
6818 			break;
6819 	}
6820 
6821 	return err;
6822 }
6823 
6824 static void
6825 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6826 {
6827 	struct got_tree_entry *te;
6828 	int isroot = s->tree == s->root;
6829 	int i = 0;
6830 
6831 	if (s->first_displayed_entry == NULL)
6832 		return;
6833 
6834 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6835 	while (i++ < maxscroll) {
6836 		if (te == NULL) {
6837 			if (!isroot)
6838 				s->first_displayed_entry = NULL;
6839 			break;
6840 		}
6841 		s->first_displayed_entry = te;
6842 		te = got_tree_entry_get_prev(s->tree, te);
6843 	}
6844 }
6845 
6846 static const struct got_error *
6847 tree_scroll_down(struct tog_view *view, int maxscroll)
6848 {
6849 	struct tog_tree_view_state *s = &view->state.tree;
6850 	struct got_tree_entry *next, *last;
6851 	int n = 0;
6852 
6853 	if (s->first_displayed_entry)
6854 		next = got_tree_entry_get_next(s->tree,
6855 		    s->first_displayed_entry);
6856 	else
6857 		next = got_object_tree_get_first_entry(s->tree);
6858 
6859 	last = s->last_displayed_entry;
6860 	while (next && n++ < maxscroll) {
6861 		if (last) {
6862 			s->last_displayed_entry = last;
6863 			last = got_tree_entry_get_next(s->tree, last);
6864 		}
6865 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6866 			s->first_displayed_entry = next;
6867 			next = got_tree_entry_get_next(s->tree, next);
6868 		}
6869 	}
6870 
6871 	return NULL;
6872 }
6873 
6874 static const struct got_error *
6875 tree_entry_path(char **path, struct tog_parent_trees *parents,
6876     struct got_tree_entry *te)
6877 {
6878 	const struct got_error *err = NULL;
6879 	struct tog_parent_tree *pt;
6880 	size_t len = 2; /* for leading slash and NUL */
6881 
6882 	TAILQ_FOREACH(pt, parents, entry)
6883 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6884 		    + 1 /* slash */;
6885 	if (te)
6886 		len += strlen(got_tree_entry_get_name(te));
6887 
6888 	*path = calloc(1, len);
6889 	if (path == NULL)
6890 		return got_error_from_errno("calloc");
6891 
6892 	(*path)[0] = '/';
6893 	pt = TAILQ_LAST(parents, tog_parent_trees);
6894 	while (pt) {
6895 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6896 		if (strlcat(*path, name, len) >= len) {
6897 			err = got_error(GOT_ERR_NO_SPACE);
6898 			goto done;
6899 		}
6900 		if (strlcat(*path, "/", len) >= len) {
6901 			err = got_error(GOT_ERR_NO_SPACE);
6902 			goto done;
6903 		}
6904 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6905 	}
6906 	if (te) {
6907 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6908 			err = got_error(GOT_ERR_NO_SPACE);
6909 			goto done;
6910 		}
6911 	}
6912 done:
6913 	if (err) {
6914 		free(*path);
6915 		*path = NULL;
6916 	}
6917 	return err;
6918 }
6919 
6920 static const struct got_error *
6921 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6922     struct got_tree_entry *te, struct tog_parent_trees *parents,
6923     struct got_object_id *commit_id, struct got_repository *repo)
6924 {
6925 	const struct got_error *err = NULL;
6926 	char *path;
6927 	struct tog_view *blame_view;
6928 
6929 	*new_view = NULL;
6930 
6931 	err = tree_entry_path(&path, parents, te);
6932 	if (err)
6933 		return err;
6934 
6935 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6936 	if (blame_view == NULL) {
6937 		err = got_error_from_errno("view_open");
6938 		goto done;
6939 	}
6940 
6941 	err = open_blame_view(blame_view, path, commit_id, repo);
6942 	if (err) {
6943 		if (err->code == GOT_ERR_CANCELLED)
6944 			err = NULL;
6945 		view_close(blame_view);
6946 	} else
6947 		*new_view = blame_view;
6948 done:
6949 	free(path);
6950 	return err;
6951 }
6952 
6953 static const struct got_error *
6954 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6955     struct tog_tree_view_state *s)
6956 {
6957 	struct tog_view *log_view;
6958 	const struct got_error *err = NULL;
6959 	char *path;
6960 
6961 	*new_view = NULL;
6962 
6963 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6964 	if (log_view == NULL)
6965 		return got_error_from_errno("view_open");
6966 
6967 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6968 	if (err)
6969 		return err;
6970 
6971 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6972 	    path, 0);
6973 	if (err)
6974 		view_close(log_view);
6975 	else
6976 		*new_view = log_view;
6977 	free(path);
6978 	return err;
6979 }
6980 
6981 static const struct got_error *
6982 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6983     const char *head_ref_name, struct got_repository *repo)
6984 {
6985 	const struct got_error *err = NULL;
6986 	char *commit_id_str = NULL;
6987 	struct tog_tree_view_state *s = &view->state.tree;
6988 	struct got_commit_object *commit = NULL;
6989 
6990 	TAILQ_INIT(&s->parents);
6991 	STAILQ_INIT(&s->colors);
6992 
6993 	s->commit_id = got_object_id_dup(commit_id);
6994 	if (s->commit_id == NULL)
6995 		return got_error_from_errno("got_object_id_dup");
6996 
6997 	err = got_object_open_as_commit(&commit, repo, commit_id);
6998 	if (err)
6999 		goto done;
7000 
7001 	/*
7002 	 * The root is opened here and will be closed when the view is closed.
7003 	 * Any visited subtrees and their path-wise parents are opened and
7004 	 * closed on demand.
7005 	 */
7006 	err = got_object_open_as_tree(&s->root, repo,
7007 	    got_object_commit_get_tree_id(commit));
7008 	if (err)
7009 		goto done;
7010 	s->tree = s->root;
7011 
7012 	err = got_object_id_str(&commit_id_str, commit_id);
7013 	if (err != NULL)
7014 		goto done;
7015 
7016 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7017 		err = got_error_from_errno("asprintf");
7018 		goto done;
7019 	}
7020 
7021 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7022 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7023 	if (head_ref_name) {
7024 		s->head_ref_name = strdup(head_ref_name);
7025 		if (s->head_ref_name == NULL) {
7026 			err = got_error_from_errno("strdup");
7027 			goto done;
7028 		}
7029 	}
7030 	s->repo = repo;
7031 
7032 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7033 		err = add_color(&s->colors, "\\$$",
7034 		    TOG_COLOR_TREE_SUBMODULE,
7035 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7036 		if (err)
7037 			goto done;
7038 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7039 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7040 		if (err)
7041 			goto done;
7042 		err = add_color(&s->colors, "/$",
7043 		    TOG_COLOR_TREE_DIRECTORY,
7044 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7045 		if (err)
7046 			goto done;
7047 
7048 		err = add_color(&s->colors, "\\*$",
7049 		    TOG_COLOR_TREE_EXECUTABLE,
7050 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7051 		if (err)
7052 			goto done;
7053 
7054 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7055 		    get_color_value("TOG_COLOR_COMMIT"));
7056 		if (err)
7057 			goto done;
7058 	}
7059 
7060 	view->show = show_tree_view;
7061 	view->input = input_tree_view;
7062 	view->close = close_tree_view;
7063 	view->search_start = search_start_tree_view;
7064 	view->search_next = search_next_tree_view;
7065 done:
7066 	free(commit_id_str);
7067 	if (commit)
7068 		got_object_commit_close(commit);
7069 	if (err)
7070 		close_tree_view(view);
7071 	return err;
7072 }
7073 
7074 static const struct got_error *
7075 close_tree_view(struct tog_view *view)
7076 {
7077 	struct tog_tree_view_state *s = &view->state.tree;
7078 
7079 	free_colors(&s->colors);
7080 	free(s->tree_label);
7081 	s->tree_label = NULL;
7082 	free(s->commit_id);
7083 	s->commit_id = NULL;
7084 	free(s->head_ref_name);
7085 	s->head_ref_name = NULL;
7086 	while (!TAILQ_EMPTY(&s->parents)) {
7087 		struct tog_parent_tree *parent;
7088 		parent = TAILQ_FIRST(&s->parents);
7089 		TAILQ_REMOVE(&s->parents, parent, entry);
7090 		if (parent->tree != s->root)
7091 			got_object_tree_close(parent->tree);
7092 		free(parent);
7093 
7094 	}
7095 	if (s->tree != NULL && s->tree != s->root)
7096 		got_object_tree_close(s->tree);
7097 	if (s->root)
7098 		got_object_tree_close(s->root);
7099 	return NULL;
7100 }
7101 
7102 static const struct got_error *
7103 search_start_tree_view(struct tog_view *view)
7104 {
7105 	struct tog_tree_view_state *s = &view->state.tree;
7106 
7107 	s->matched_entry = NULL;
7108 	return NULL;
7109 }
7110 
7111 static int
7112 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7113 {
7114 	regmatch_t regmatch;
7115 
7116 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7117 	    0) == 0;
7118 }
7119 
7120 static const struct got_error *
7121 search_next_tree_view(struct tog_view *view)
7122 {
7123 	struct tog_tree_view_state *s = &view->state.tree;
7124 	struct got_tree_entry *te = NULL;
7125 
7126 	if (!view->searching) {
7127 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7128 		return NULL;
7129 	}
7130 
7131 	if (s->matched_entry) {
7132 		if (view->searching == TOG_SEARCH_FORWARD) {
7133 			if (s->selected_entry)
7134 				te = got_tree_entry_get_next(s->tree,
7135 				    s->selected_entry);
7136 			else
7137 				te = got_object_tree_get_first_entry(s->tree);
7138 		} else {
7139 			if (s->selected_entry == NULL)
7140 				te = got_object_tree_get_last_entry(s->tree);
7141 			else
7142 				te = got_tree_entry_get_prev(s->tree,
7143 				    s->selected_entry);
7144 		}
7145 	} else {
7146 		if (s->selected_entry)
7147 			te = s->selected_entry;
7148 		else if (view->searching == TOG_SEARCH_FORWARD)
7149 			te = got_object_tree_get_first_entry(s->tree);
7150 		else
7151 			te = got_object_tree_get_last_entry(s->tree);
7152 	}
7153 
7154 	while (1) {
7155 		if (te == NULL) {
7156 			if (s->matched_entry == NULL) {
7157 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7158 				return NULL;
7159 			}
7160 			if (view->searching == TOG_SEARCH_FORWARD)
7161 				te = got_object_tree_get_first_entry(s->tree);
7162 			else
7163 				te = got_object_tree_get_last_entry(s->tree);
7164 		}
7165 
7166 		if (match_tree_entry(te, &view->regex)) {
7167 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7168 			s->matched_entry = te;
7169 			break;
7170 		}
7171 
7172 		if (view->searching == TOG_SEARCH_FORWARD)
7173 			te = got_tree_entry_get_next(s->tree, te);
7174 		else
7175 			te = got_tree_entry_get_prev(s->tree, te);
7176 	}
7177 
7178 	if (s->matched_entry) {
7179 		s->first_displayed_entry = s->matched_entry;
7180 		s->selected = 0;
7181 	}
7182 
7183 	return NULL;
7184 }
7185 
7186 static const struct got_error *
7187 show_tree_view(struct tog_view *view)
7188 {
7189 	const struct got_error *err = NULL;
7190 	struct tog_tree_view_state *s = &view->state.tree;
7191 	char *parent_path;
7192 
7193 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7194 	if (err)
7195 		return err;
7196 
7197 	err = draw_tree_entries(view, parent_path);
7198 	free(parent_path);
7199 
7200 	view_border(view);
7201 	return err;
7202 }
7203 
7204 static const struct got_error *
7205 tree_goto_line(struct tog_view *view, int nlines)
7206 {
7207 	const struct got_error		 *err = NULL;
7208 	struct tog_tree_view_state	 *s = &view->state.tree;
7209 	struct got_tree_entry		**fte, **lte, **ste;
7210 	int				  g, last, first = 1, i = 1;
7211 	int				  root = s->tree == s->root;
7212 	int				  off = root ? 1 : 2;
7213 
7214 	g = view->gline;
7215 	view->gline = 0;
7216 
7217 	if (g == 0)
7218 		g = 1;
7219 	else if (g > got_object_tree_get_nentries(s->tree))
7220 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7221 
7222 	fte = &s->first_displayed_entry;
7223 	lte = &s->last_displayed_entry;
7224 	ste = &s->selected_entry;
7225 
7226 	if (*fte != NULL) {
7227 		first = got_tree_entry_get_index(*fte);
7228 		first += off;  /* account for ".." */
7229 	}
7230 	last = got_tree_entry_get_index(*lte);
7231 	last += off;
7232 
7233 	if (g >= first && g <= last && g - first < nlines) {
7234 		s->selected = g - first;
7235 		return NULL;	/* gline is on the current page */
7236 	}
7237 
7238 	if (*ste != NULL) {
7239 		i = got_tree_entry_get_index(*ste);
7240 		i += off;
7241 	}
7242 
7243 	if (i < g) {
7244 		err = tree_scroll_down(view, g - i);
7245 		if (err)
7246 			return err;
7247 		if (got_tree_entry_get_index(*lte) >=
7248 		    got_object_tree_get_nentries(s->tree) - 1 &&
7249 		    first + s->selected < g &&
7250 		    s->selected < s->ndisplayed - 1) {
7251 			first = got_tree_entry_get_index(*fte);
7252 			first += off;
7253 			s->selected = g - first;
7254 		}
7255 	} else if (i > g)
7256 		tree_scroll_up(s, i - g);
7257 
7258 	if (g < nlines &&
7259 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7260 		s->selected = g - 1;
7261 
7262 	return NULL;
7263 }
7264 
7265 static const struct got_error *
7266 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7267 {
7268 	const struct got_error *err = NULL;
7269 	struct tog_tree_view_state *s = &view->state.tree;
7270 	struct got_tree_entry *te;
7271 	int n, nscroll = view->nlines - 3;
7272 
7273 	if (view->gline)
7274 		return tree_goto_line(view, nscroll);
7275 
7276 	switch (ch) {
7277 	case 'i':
7278 		s->show_ids = !s->show_ids;
7279 		view->count = 0;
7280 		break;
7281 	case 'L':
7282 		view->count = 0;
7283 		if (!s->selected_entry)
7284 			break;
7285 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7286 		break;
7287 	case 'R':
7288 		view->count = 0;
7289 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7290 		break;
7291 	case 'g':
7292 	case KEY_HOME:
7293 		s->selected = 0;
7294 		view->count = 0;
7295 		if (s->tree == s->root)
7296 			s->first_displayed_entry =
7297 			    got_object_tree_get_first_entry(s->tree);
7298 		else
7299 			s->first_displayed_entry = NULL;
7300 		break;
7301 	case 'G':
7302 	case KEY_END: {
7303 		int eos = view->nlines - 3;
7304 
7305 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7306 			--eos;  /* border */
7307 		s->selected = 0;
7308 		view->count = 0;
7309 		te = got_object_tree_get_last_entry(s->tree);
7310 		for (n = 0; n < eos; n++) {
7311 			if (te == NULL) {
7312 				if (s->tree != s->root) {
7313 					s->first_displayed_entry = NULL;
7314 					n++;
7315 				}
7316 				break;
7317 			}
7318 			s->first_displayed_entry = te;
7319 			te = got_tree_entry_get_prev(s->tree, te);
7320 		}
7321 		if (n > 0)
7322 			s->selected = n - 1;
7323 		break;
7324 	}
7325 	case 'k':
7326 	case KEY_UP:
7327 	case CTRL('p'):
7328 		if (s->selected > 0) {
7329 			s->selected--;
7330 			break;
7331 		}
7332 		tree_scroll_up(s, 1);
7333 		if (s->selected_entry == NULL ||
7334 		    (s->tree == s->root && s->selected_entry ==
7335 		     got_object_tree_get_first_entry(s->tree)))
7336 			view->count = 0;
7337 		break;
7338 	case CTRL('u'):
7339 	case 'u':
7340 		nscroll /= 2;
7341 		/* FALL THROUGH */
7342 	case KEY_PPAGE:
7343 	case CTRL('b'):
7344 	case 'b':
7345 		if (s->tree == s->root) {
7346 			if (got_object_tree_get_first_entry(s->tree) ==
7347 			    s->first_displayed_entry)
7348 				s->selected -= MIN(s->selected, nscroll);
7349 		} else {
7350 			if (s->first_displayed_entry == NULL)
7351 				s->selected -= MIN(s->selected, nscroll);
7352 		}
7353 		tree_scroll_up(s, MAX(0, nscroll));
7354 		if (s->selected_entry == NULL ||
7355 		    (s->tree == s->root && s->selected_entry ==
7356 		     got_object_tree_get_first_entry(s->tree)))
7357 			view->count = 0;
7358 		break;
7359 	case 'j':
7360 	case KEY_DOWN:
7361 	case CTRL('n'):
7362 		if (s->selected < s->ndisplayed - 1) {
7363 			s->selected++;
7364 			break;
7365 		}
7366 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7367 		    == NULL) {
7368 			/* can't scroll any further */
7369 			view->count = 0;
7370 			break;
7371 		}
7372 		tree_scroll_down(view, 1);
7373 		break;
7374 	case CTRL('d'):
7375 	case 'd':
7376 		nscroll /= 2;
7377 		/* FALL THROUGH */
7378 	case KEY_NPAGE:
7379 	case CTRL('f'):
7380 	case 'f':
7381 	case ' ':
7382 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7383 		    == NULL) {
7384 			/* can't scroll any further; move cursor down */
7385 			if (s->selected < s->ndisplayed - 1)
7386 				s->selected += MIN(nscroll,
7387 				    s->ndisplayed - s->selected - 1);
7388 			else
7389 				view->count = 0;
7390 			break;
7391 		}
7392 		tree_scroll_down(view, nscroll);
7393 		break;
7394 	case KEY_ENTER:
7395 	case '\r':
7396 	case KEY_BACKSPACE:
7397 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7398 			struct tog_parent_tree *parent;
7399 			/* user selected '..' */
7400 			if (s->tree == s->root) {
7401 				view->count = 0;
7402 				break;
7403 			}
7404 			parent = TAILQ_FIRST(&s->parents);
7405 			TAILQ_REMOVE(&s->parents, parent,
7406 			    entry);
7407 			got_object_tree_close(s->tree);
7408 			s->tree = parent->tree;
7409 			s->first_displayed_entry =
7410 			    parent->first_displayed_entry;
7411 			s->selected_entry =
7412 			    parent->selected_entry;
7413 			s->selected = parent->selected;
7414 			if (s->selected > view->nlines - 3) {
7415 				err = offset_selection_down(view);
7416 				if (err)
7417 					break;
7418 			}
7419 			free(parent);
7420 		} else if (S_ISDIR(got_tree_entry_get_mode(
7421 		    s->selected_entry))) {
7422 			struct got_tree_object *subtree;
7423 			view->count = 0;
7424 			err = got_object_open_as_tree(&subtree, s->repo,
7425 			    got_tree_entry_get_id(s->selected_entry));
7426 			if (err)
7427 				break;
7428 			err = tree_view_visit_subtree(s, subtree);
7429 			if (err) {
7430 				got_object_tree_close(subtree);
7431 				break;
7432 			}
7433 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7434 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7435 		break;
7436 	case KEY_RESIZE:
7437 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7438 			s->selected = view->nlines - 4;
7439 		view->count = 0;
7440 		break;
7441 	default:
7442 		view->count = 0;
7443 		break;
7444 	}
7445 
7446 	return err;
7447 }
7448 
7449 __dead static void
7450 usage_tree(void)
7451 {
7452 	endwin();
7453 	fprintf(stderr,
7454 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7455 	    getprogname());
7456 	exit(1);
7457 }
7458 
7459 static const struct got_error *
7460 cmd_tree(int argc, char *argv[])
7461 {
7462 	const struct got_error *error;
7463 	struct got_repository *repo = NULL;
7464 	struct got_worktree *worktree = NULL;
7465 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7466 	struct got_object_id *commit_id = NULL;
7467 	struct got_commit_object *commit = NULL;
7468 	const char *commit_id_arg = NULL;
7469 	char *label = NULL;
7470 	struct got_reference *ref = NULL;
7471 	const char *head_ref_name = NULL;
7472 	int ch;
7473 	struct tog_view *view;
7474 	int *pack_fds = NULL;
7475 
7476 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7477 		switch (ch) {
7478 		case 'c':
7479 			commit_id_arg = optarg;
7480 			break;
7481 		case 'r':
7482 			repo_path = realpath(optarg, NULL);
7483 			if (repo_path == NULL)
7484 				return got_error_from_errno2("realpath",
7485 				    optarg);
7486 			break;
7487 		default:
7488 			usage_tree();
7489 			/* NOTREACHED */
7490 		}
7491 	}
7492 
7493 	argc -= optind;
7494 	argv += optind;
7495 
7496 	if (argc > 1)
7497 		usage_tree();
7498 
7499 	error = got_repo_pack_fds_open(&pack_fds);
7500 	if (error != NULL)
7501 		goto done;
7502 
7503 	if (repo_path == NULL) {
7504 		cwd = getcwd(NULL, 0);
7505 		if (cwd == NULL)
7506 			return got_error_from_errno("getcwd");
7507 		error = got_worktree_open(&worktree, cwd);
7508 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7509 			goto done;
7510 		if (worktree)
7511 			repo_path =
7512 			    strdup(got_worktree_get_repo_path(worktree));
7513 		else
7514 			repo_path = strdup(cwd);
7515 		if (repo_path == NULL) {
7516 			error = got_error_from_errno("strdup");
7517 			goto done;
7518 		}
7519 	}
7520 
7521 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7522 	if (error != NULL)
7523 		goto done;
7524 
7525 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7526 	    repo, worktree);
7527 	if (error)
7528 		goto done;
7529 
7530 	init_curses();
7531 
7532 	error = apply_unveil(got_repo_get_path(repo), NULL);
7533 	if (error)
7534 		goto done;
7535 
7536 	error = tog_load_refs(repo, 0);
7537 	if (error)
7538 		goto done;
7539 
7540 	if (commit_id_arg == NULL) {
7541 		error = got_repo_match_object_id(&commit_id, &label,
7542 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7543 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7544 		if (error)
7545 			goto done;
7546 		head_ref_name = label;
7547 	} else {
7548 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7549 		if (error == NULL)
7550 			head_ref_name = got_ref_get_name(ref);
7551 		else if (error->code != GOT_ERR_NOT_REF)
7552 			goto done;
7553 		error = got_repo_match_object_id(&commit_id, NULL,
7554 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7555 		if (error)
7556 			goto done;
7557 	}
7558 
7559 	error = got_object_open_as_commit(&commit, repo, commit_id);
7560 	if (error)
7561 		goto done;
7562 
7563 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7564 	if (view == NULL) {
7565 		error = got_error_from_errno("view_open");
7566 		goto done;
7567 	}
7568 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7569 	if (error)
7570 		goto done;
7571 	if (!got_path_is_root_dir(in_repo_path)) {
7572 		error = tree_view_walk_path(&view->state.tree, commit,
7573 		    in_repo_path);
7574 		if (error)
7575 			goto done;
7576 	}
7577 
7578 	if (worktree) {
7579 		/* Release work tree lock. */
7580 		got_worktree_close(worktree);
7581 		worktree = NULL;
7582 	}
7583 	error = view_loop(view);
7584 done:
7585 	free(repo_path);
7586 	free(cwd);
7587 	free(commit_id);
7588 	free(label);
7589 	if (ref)
7590 		got_ref_close(ref);
7591 	if (repo) {
7592 		const struct got_error *close_err = got_repo_close(repo);
7593 		if (error == NULL)
7594 			error = close_err;
7595 	}
7596 	if (pack_fds) {
7597 		const struct got_error *pack_err =
7598 		    got_repo_pack_fds_close(pack_fds);
7599 		if (error == NULL)
7600 			error = pack_err;
7601 	}
7602 	tog_free_refs();
7603 	return error;
7604 }
7605 
7606 static const struct got_error *
7607 ref_view_load_refs(struct tog_ref_view_state *s)
7608 {
7609 	struct got_reflist_entry *sre;
7610 	struct tog_reflist_entry *re;
7611 
7612 	s->nrefs = 0;
7613 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7614 		if (strncmp(got_ref_get_name(sre->ref),
7615 		    "refs/got/", 9) == 0 &&
7616 		    strncmp(got_ref_get_name(sre->ref),
7617 		    "refs/got/backup/", 16) != 0)
7618 			continue;
7619 
7620 		re = malloc(sizeof(*re));
7621 		if (re == NULL)
7622 			return got_error_from_errno("malloc");
7623 
7624 		re->ref = got_ref_dup(sre->ref);
7625 		if (re->ref == NULL)
7626 			return got_error_from_errno("got_ref_dup");
7627 		re->idx = s->nrefs++;
7628 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7629 	}
7630 
7631 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7632 	return NULL;
7633 }
7634 
7635 static void
7636 ref_view_free_refs(struct tog_ref_view_state *s)
7637 {
7638 	struct tog_reflist_entry *re;
7639 
7640 	while (!TAILQ_EMPTY(&s->refs)) {
7641 		re = TAILQ_FIRST(&s->refs);
7642 		TAILQ_REMOVE(&s->refs, re, entry);
7643 		got_ref_close(re->ref);
7644 		free(re);
7645 	}
7646 }
7647 
7648 static const struct got_error *
7649 open_ref_view(struct tog_view *view, struct got_repository *repo)
7650 {
7651 	const struct got_error *err = NULL;
7652 	struct tog_ref_view_state *s = &view->state.ref;
7653 
7654 	s->selected_entry = 0;
7655 	s->repo = repo;
7656 
7657 	TAILQ_INIT(&s->refs);
7658 	STAILQ_INIT(&s->colors);
7659 
7660 	err = ref_view_load_refs(s);
7661 	if (err)
7662 		return err;
7663 
7664 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7665 		err = add_color(&s->colors, "^refs/heads/",
7666 		    TOG_COLOR_REFS_HEADS,
7667 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7668 		if (err)
7669 			goto done;
7670 
7671 		err = add_color(&s->colors, "^refs/tags/",
7672 		    TOG_COLOR_REFS_TAGS,
7673 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7674 		if (err)
7675 			goto done;
7676 
7677 		err = add_color(&s->colors, "^refs/remotes/",
7678 		    TOG_COLOR_REFS_REMOTES,
7679 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7680 		if (err)
7681 			goto done;
7682 
7683 		err = add_color(&s->colors, "^refs/got/backup/",
7684 		    TOG_COLOR_REFS_BACKUP,
7685 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7686 		if (err)
7687 			goto done;
7688 	}
7689 
7690 	view->show = show_ref_view;
7691 	view->input = input_ref_view;
7692 	view->close = close_ref_view;
7693 	view->search_start = search_start_ref_view;
7694 	view->search_next = search_next_ref_view;
7695 done:
7696 	if (err)
7697 		free_colors(&s->colors);
7698 	return err;
7699 }
7700 
7701 static const struct got_error *
7702 close_ref_view(struct tog_view *view)
7703 {
7704 	struct tog_ref_view_state *s = &view->state.ref;
7705 
7706 	ref_view_free_refs(s);
7707 	free_colors(&s->colors);
7708 
7709 	return NULL;
7710 }
7711 
7712 static const struct got_error *
7713 resolve_reflist_entry(struct got_object_id **commit_id,
7714     struct tog_reflist_entry *re, struct got_repository *repo)
7715 {
7716 	const struct got_error *err = NULL;
7717 	struct got_object_id *obj_id;
7718 	struct got_tag_object *tag = NULL;
7719 	int obj_type;
7720 
7721 	*commit_id = NULL;
7722 
7723 	err = got_ref_resolve(&obj_id, repo, re->ref);
7724 	if (err)
7725 		return err;
7726 
7727 	err = got_object_get_type(&obj_type, repo, obj_id);
7728 	if (err)
7729 		goto done;
7730 
7731 	switch (obj_type) {
7732 	case GOT_OBJ_TYPE_COMMIT:
7733 		*commit_id = obj_id;
7734 		break;
7735 	case GOT_OBJ_TYPE_TAG:
7736 		err = got_object_open_as_tag(&tag, repo, obj_id);
7737 		if (err)
7738 			goto done;
7739 		free(obj_id);
7740 		err = got_object_get_type(&obj_type, repo,
7741 		    got_object_tag_get_object_id(tag));
7742 		if (err)
7743 			goto done;
7744 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7745 			err = got_error(GOT_ERR_OBJ_TYPE);
7746 			goto done;
7747 		}
7748 		*commit_id = got_object_id_dup(
7749 		    got_object_tag_get_object_id(tag));
7750 		if (*commit_id == NULL) {
7751 			err = got_error_from_errno("got_object_id_dup");
7752 			goto done;
7753 		}
7754 		break;
7755 	default:
7756 		err = got_error(GOT_ERR_OBJ_TYPE);
7757 		break;
7758 	}
7759 
7760 done:
7761 	if (tag)
7762 		got_object_tag_close(tag);
7763 	if (err) {
7764 		free(*commit_id);
7765 		*commit_id = NULL;
7766 	}
7767 	return err;
7768 }
7769 
7770 static const struct got_error *
7771 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7772     struct tog_reflist_entry *re, struct got_repository *repo)
7773 {
7774 	struct tog_view *log_view;
7775 	const struct got_error *err = NULL;
7776 	struct got_object_id *commit_id = NULL;
7777 
7778 	*new_view = NULL;
7779 
7780 	err = resolve_reflist_entry(&commit_id, re, repo);
7781 	if (err) {
7782 		if (err->code != GOT_ERR_OBJ_TYPE)
7783 			return err;
7784 		else
7785 			return NULL;
7786 	}
7787 
7788 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7789 	if (log_view == NULL) {
7790 		err = got_error_from_errno("view_open");
7791 		goto done;
7792 	}
7793 
7794 	err = open_log_view(log_view, commit_id, repo,
7795 	    got_ref_get_name(re->ref), "", 0);
7796 done:
7797 	if (err)
7798 		view_close(log_view);
7799 	else
7800 		*new_view = log_view;
7801 	free(commit_id);
7802 	return err;
7803 }
7804 
7805 static void
7806 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7807 {
7808 	struct tog_reflist_entry *re;
7809 	int i = 0;
7810 
7811 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7812 		return;
7813 
7814 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7815 	while (i++ < maxscroll) {
7816 		if (re == NULL)
7817 			break;
7818 		s->first_displayed_entry = re;
7819 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7820 	}
7821 }
7822 
7823 static const struct got_error *
7824 ref_scroll_down(struct tog_view *view, int maxscroll)
7825 {
7826 	struct tog_ref_view_state *s = &view->state.ref;
7827 	struct tog_reflist_entry *next, *last;
7828 	int n = 0;
7829 
7830 	if (s->first_displayed_entry)
7831 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7832 	else
7833 		next = TAILQ_FIRST(&s->refs);
7834 
7835 	last = s->last_displayed_entry;
7836 	while (next && n++ < maxscroll) {
7837 		if (last) {
7838 			s->last_displayed_entry = last;
7839 			last = TAILQ_NEXT(last, entry);
7840 		}
7841 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7842 			s->first_displayed_entry = next;
7843 			next = TAILQ_NEXT(next, entry);
7844 		}
7845 	}
7846 
7847 	return NULL;
7848 }
7849 
7850 static const struct got_error *
7851 search_start_ref_view(struct tog_view *view)
7852 {
7853 	struct tog_ref_view_state *s = &view->state.ref;
7854 
7855 	s->matched_entry = NULL;
7856 	return NULL;
7857 }
7858 
7859 static int
7860 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7861 {
7862 	regmatch_t regmatch;
7863 
7864 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7865 	    0) == 0;
7866 }
7867 
7868 static const struct got_error *
7869 search_next_ref_view(struct tog_view *view)
7870 {
7871 	struct tog_ref_view_state *s = &view->state.ref;
7872 	struct tog_reflist_entry *re = NULL;
7873 
7874 	if (!view->searching) {
7875 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7876 		return NULL;
7877 	}
7878 
7879 	if (s->matched_entry) {
7880 		if (view->searching == TOG_SEARCH_FORWARD) {
7881 			if (s->selected_entry)
7882 				re = TAILQ_NEXT(s->selected_entry, entry);
7883 			else
7884 				re = TAILQ_PREV(s->selected_entry,
7885 				    tog_reflist_head, entry);
7886 		} else {
7887 			if (s->selected_entry == NULL)
7888 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7889 			else
7890 				re = TAILQ_PREV(s->selected_entry,
7891 				    tog_reflist_head, entry);
7892 		}
7893 	} else {
7894 		if (s->selected_entry)
7895 			re = s->selected_entry;
7896 		else if (view->searching == TOG_SEARCH_FORWARD)
7897 			re = TAILQ_FIRST(&s->refs);
7898 		else
7899 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7900 	}
7901 
7902 	while (1) {
7903 		if (re == NULL) {
7904 			if (s->matched_entry == NULL) {
7905 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7906 				return NULL;
7907 			}
7908 			if (view->searching == TOG_SEARCH_FORWARD)
7909 				re = TAILQ_FIRST(&s->refs);
7910 			else
7911 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7912 		}
7913 
7914 		if (match_reflist_entry(re, &view->regex)) {
7915 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7916 			s->matched_entry = re;
7917 			break;
7918 		}
7919 
7920 		if (view->searching == TOG_SEARCH_FORWARD)
7921 			re = TAILQ_NEXT(re, entry);
7922 		else
7923 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7924 	}
7925 
7926 	if (s->matched_entry) {
7927 		s->first_displayed_entry = s->matched_entry;
7928 		s->selected = 0;
7929 	}
7930 
7931 	return NULL;
7932 }
7933 
7934 static const struct got_error *
7935 show_ref_view(struct tog_view *view)
7936 {
7937 	const struct got_error *err = NULL;
7938 	struct tog_ref_view_state *s = &view->state.ref;
7939 	struct tog_reflist_entry *re;
7940 	char *line = NULL;
7941 	wchar_t *wline;
7942 	struct tog_color *tc;
7943 	int width, n;
7944 	int limit = view->nlines;
7945 
7946 	werase(view->window);
7947 
7948 	s->ndisplayed = 0;
7949 	if (view_is_hsplit_top(view))
7950 		--limit;  /* border */
7951 
7952 	if (limit == 0)
7953 		return NULL;
7954 
7955 	re = s->first_displayed_entry;
7956 
7957 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7958 	    s->nrefs) == -1)
7959 		return got_error_from_errno("asprintf");
7960 
7961 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7962 	if (err) {
7963 		free(line);
7964 		return err;
7965 	}
7966 	if (view_needs_focus_indication(view))
7967 		wstandout(view->window);
7968 	waddwstr(view->window, wline);
7969 	while (width++ < view->ncols)
7970 		waddch(view->window, ' ');
7971 	if (view_needs_focus_indication(view))
7972 		wstandend(view->window);
7973 	free(wline);
7974 	wline = NULL;
7975 	free(line);
7976 	line = NULL;
7977 	if (--limit <= 0)
7978 		return NULL;
7979 
7980 	n = 0;
7981 	while (re && limit > 0) {
7982 		char *line = NULL;
7983 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7984 
7985 		if (s->show_date) {
7986 			struct got_commit_object *ci;
7987 			struct got_tag_object *tag;
7988 			struct got_object_id *id;
7989 			struct tm tm;
7990 			time_t t;
7991 
7992 			err = got_ref_resolve(&id, s->repo, re->ref);
7993 			if (err)
7994 				return err;
7995 			err = got_object_open_as_tag(&tag, s->repo, id);
7996 			if (err) {
7997 				if (err->code != GOT_ERR_OBJ_TYPE) {
7998 					free(id);
7999 					return err;
8000 				}
8001 				err = got_object_open_as_commit(&ci, s->repo,
8002 				    id);
8003 				if (err) {
8004 					free(id);
8005 					return err;
8006 				}
8007 				t = got_object_commit_get_committer_time(ci);
8008 				got_object_commit_close(ci);
8009 			} else {
8010 				t = got_object_tag_get_tagger_time(tag);
8011 				got_object_tag_close(tag);
8012 			}
8013 			free(id);
8014 			if (gmtime_r(&t, &tm) == NULL)
8015 				return got_error_from_errno("gmtime_r");
8016 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8017 				return got_error(GOT_ERR_NO_SPACE);
8018 		}
8019 		if (got_ref_is_symbolic(re->ref)) {
8020 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8021 			    ymd : "", got_ref_get_name(re->ref),
8022 			    got_ref_get_symref_target(re->ref)) == -1)
8023 				return got_error_from_errno("asprintf");
8024 		} else if (s->show_ids) {
8025 			struct got_object_id *id;
8026 			char *id_str;
8027 			err = got_ref_resolve(&id, s->repo, re->ref);
8028 			if (err)
8029 				return err;
8030 			err = got_object_id_str(&id_str, id);
8031 			if (err) {
8032 				free(id);
8033 				return err;
8034 			}
8035 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8036 			    got_ref_get_name(re->ref), id_str) == -1) {
8037 				err = got_error_from_errno("asprintf");
8038 				free(id);
8039 				free(id_str);
8040 				return err;
8041 			}
8042 			free(id);
8043 			free(id_str);
8044 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8045 		    got_ref_get_name(re->ref)) == -1)
8046 			return got_error_from_errno("asprintf");
8047 
8048 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
8049 		    0, 0);
8050 		if (err) {
8051 			free(line);
8052 			return err;
8053 		}
8054 		if (n == s->selected) {
8055 			if (view->focussed)
8056 				wstandout(view->window);
8057 			s->selected_entry = re;
8058 		}
8059 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8060 		if (tc)
8061 			wattr_on(view->window,
8062 			    COLOR_PAIR(tc->colorpair), NULL);
8063 		waddwstr(view->window, wline);
8064 		if (tc)
8065 			wattr_off(view->window,
8066 			    COLOR_PAIR(tc->colorpair), NULL);
8067 		if (width < view->ncols - 1)
8068 			waddch(view->window, '\n');
8069 		if (n == s->selected && view->focussed)
8070 			wstandend(view->window);
8071 		free(line);
8072 		free(wline);
8073 		wline = NULL;
8074 		n++;
8075 		s->ndisplayed++;
8076 		s->last_displayed_entry = re;
8077 
8078 		limit--;
8079 		re = TAILQ_NEXT(re, entry);
8080 	}
8081 
8082 	view_border(view);
8083 	return err;
8084 }
8085 
8086 static const struct got_error *
8087 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8088     struct tog_reflist_entry *re, struct got_repository *repo)
8089 {
8090 	const struct got_error *err = NULL;
8091 	struct got_object_id *commit_id = NULL;
8092 	struct tog_view *tree_view;
8093 
8094 	*new_view = NULL;
8095 
8096 	err = resolve_reflist_entry(&commit_id, re, repo);
8097 	if (err) {
8098 		if (err->code != GOT_ERR_OBJ_TYPE)
8099 			return err;
8100 		else
8101 			return NULL;
8102 	}
8103 
8104 
8105 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8106 	if (tree_view == NULL) {
8107 		err = got_error_from_errno("view_open");
8108 		goto done;
8109 	}
8110 
8111 	err = open_tree_view(tree_view, commit_id,
8112 	    got_ref_get_name(re->ref), repo);
8113 	if (err)
8114 		goto done;
8115 
8116 	*new_view = tree_view;
8117 done:
8118 	free(commit_id);
8119 	return err;
8120 }
8121 
8122 static const struct got_error *
8123 ref_goto_line(struct tog_view *view, int nlines)
8124 {
8125 	const struct got_error		*err = NULL;
8126 	struct tog_ref_view_state	*s = &view->state.ref;
8127 	int				 g, idx = s->selected_entry->idx;
8128 
8129 	g = view->gline;
8130 	view->gline = 0;
8131 
8132 	if (g == 0)
8133 		g = 1;
8134 	else if (g > s->nrefs)
8135 		g = s->nrefs;
8136 
8137 	if (g >= s->first_displayed_entry->idx + 1 &&
8138 	    g <= s->last_displayed_entry->idx + 1 &&
8139 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8140 		s->selected = g - s->first_displayed_entry->idx - 1;
8141 		return NULL;
8142 	}
8143 
8144 	if (idx + 1 < g) {
8145 		err = ref_scroll_down(view, g - idx - 1);
8146 		if (err)
8147 			return err;
8148 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8149 		    s->first_displayed_entry->idx + s->selected < g &&
8150 		    s->selected < s->ndisplayed - 1)
8151 			s->selected = g - s->first_displayed_entry->idx - 1;
8152 	} else if (idx + 1 > g)
8153 		ref_scroll_up(s, idx - g + 1);
8154 
8155 	if (g < nlines && s->first_displayed_entry->idx == 0)
8156 		s->selected = g - 1;
8157 
8158 	return NULL;
8159 
8160 }
8161 
8162 static const struct got_error *
8163 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8164 {
8165 	const struct got_error *err = NULL;
8166 	struct tog_ref_view_state *s = &view->state.ref;
8167 	struct tog_reflist_entry *re;
8168 	int n, nscroll = view->nlines - 1;
8169 
8170 	if (view->gline)
8171 		return ref_goto_line(view, nscroll);
8172 
8173 	switch (ch) {
8174 	case 'i':
8175 		s->show_ids = !s->show_ids;
8176 		view->count = 0;
8177 		break;
8178 	case 'm':
8179 		s->show_date = !s->show_date;
8180 		view->count = 0;
8181 		break;
8182 	case 'o':
8183 		s->sort_by_date = !s->sort_by_date;
8184 		view->count = 0;
8185 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8186 		    got_ref_cmp_by_commit_timestamp_descending :
8187 		    tog_ref_cmp_by_name, s->repo);
8188 		if (err)
8189 			break;
8190 		got_reflist_object_id_map_free(tog_refs_idmap);
8191 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8192 		    &tog_refs, s->repo);
8193 		if (err)
8194 			break;
8195 		ref_view_free_refs(s);
8196 		err = ref_view_load_refs(s);
8197 		break;
8198 	case KEY_ENTER:
8199 	case '\r':
8200 		view->count = 0;
8201 		if (!s->selected_entry)
8202 			break;
8203 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8204 		break;
8205 	case 'T':
8206 		view->count = 0;
8207 		if (!s->selected_entry)
8208 			break;
8209 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8210 		break;
8211 	case 'g':
8212 	case KEY_HOME:
8213 		s->selected = 0;
8214 		view->count = 0;
8215 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8216 		break;
8217 	case 'G':
8218 	case KEY_END: {
8219 		int eos = view->nlines - 1;
8220 
8221 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8222 			--eos;  /* border */
8223 		s->selected = 0;
8224 		view->count = 0;
8225 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8226 		for (n = 0; n < eos; n++) {
8227 			if (re == NULL)
8228 				break;
8229 			s->first_displayed_entry = re;
8230 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8231 		}
8232 		if (n > 0)
8233 			s->selected = n - 1;
8234 		break;
8235 	}
8236 	case 'k':
8237 	case KEY_UP:
8238 	case CTRL('p'):
8239 		if (s->selected > 0) {
8240 			s->selected--;
8241 			break;
8242 		}
8243 		ref_scroll_up(s, 1);
8244 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8245 			view->count = 0;
8246 		break;
8247 	case CTRL('u'):
8248 	case 'u':
8249 		nscroll /= 2;
8250 		/* FALL THROUGH */
8251 	case KEY_PPAGE:
8252 	case CTRL('b'):
8253 	case 'b':
8254 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8255 			s->selected -= MIN(nscroll, s->selected);
8256 		ref_scroll_up(s, MAX(0, nscroll));
8257 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8258 			view->count = 0;
8259 		break;
8260 	case 'j':
8261 	case KEY_DOWN:
8262 	case CTRL('n'):
8263 		if (s->selected < s->ndisplayed - 1) {
8264 			s->selected++;
8265 			break;
8266 		}
8267 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8268 			/* can't scroll any further */
8269 			view->count = 0;
8270 			break;
8271 		}
8272 		ref_scroll_down(view, 1);
8273 		break;
8274 	case CTRL('d'):
8275 	case 'd':
8276 		nscroll /= 2;
8277 		/* FALL THROUGH */
8278 	case KEY_NPAGE:
8279 	case CTRL('f'):
8280 	case 'f':
8281 	case ' ':
8282 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8283 			/* can't scroll any further; move cursor down */
8284 			if (s->selected < s->ndisplayed - 1)
8285 				s->selected += MIN(nscroll,
8286 				    s->ndisplayed - s->selected - 1);
8287 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8288 				s->selected += s->ndisplayed - s->selected - 1;
8289 			view->count = 0;
8290 			break;
8291 		}
8292 		ref_scroll_down(view, nscroll);
8293 		break;
8294 	case CTRL('l'):
8295 		view->count = 0;
8296 		tog_free_refs();
8297 		err = tog_load_refs(s->repo, s->sort_by_date);
8298 		if (err)
8299 			break;
8300 		ref_view_free_refs(s);
8301 		err = ref_view_load_refs(s);
8302 		break;
8303 	case KEY_RESIZE:
8304 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8305 			s->selected = view->nlines - 2;
8306 		break;
8307 	default:
8308 		view->count = 0;
8309 		break;
8310 	}
8311 
8312 	return err;
8313 }
8314 
8315 __dead static void
8316 usage_ref(void)
8317 {
8318 	endwin();
8319 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8320 	    getprogname());
8321 	exit(1);
8322 }
8323 
8324 static const struct got_error *
8325 cmd_ref(int argc, char *argv[])
8326 {
8327 	const struct got_error *error;
8328 	struct got_repository *repo = NULL;
8329 	struct got_worktree *worktree = NULL;
8330 	char *cwd = NULL, *repo_path = NULL;
8331 	int ch;
8332 	struct tog_view *view;
8333 	int *pack_fds = NULL;
8334 
8335 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8336 		switch (ch) {
8337 		case 'r':
8338 			repo_path = realpath(optarg, NULL);
8339 			if (repo_path == NULL)
8340 				return got_error_from_errno2("realpath",
8341 				    optarg);
8342 			break;
8343 		default:
8344 			usage_ref();
8345 			/* NOTREACHED */
8346 		}
8347 	}
8348 
8349 	argc -= optind;
8350 	argv += optind;
8351 
8352 	if (argc > 1)
8353 		usage_ref();
8354 
8355 	error = got_repo_pack_fds_open(&pack_fds);
8356 	if (error != NULL)
8357 		goto done;
8358 
8359 	if (repo_path == NULL) {
8360 		cwd = getcwd(NULL, 0);
8361 		if (cwd == NULL)
8362 			return got_error_from_errno("getcwd");
8363 		error = got_worktree_open(&worktree, cwd);
8364 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8365 			goto done;
8366 		if (worktree)
8367 			repo_path =
8368 			    strdup(got_worktree_get_repo_path(worktree));
8369 		else
8370 			repo_path = strdup(cwd);
8371 		if (repo_path == NULL) {
8372 			error = got_error_from_errno("strdup");
8373 			goto done;
8374 		}
8375 	}
8376 
8377 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8378 	if (error != NULL)
8379 		goto done;
8380 
8381 	init_curses();
8382 
8383 	error = apply_unveil(got_repo_get_path(repo), NULL);
8384 	if (error)
8385 		goto done;
8386 
8387 	error = tog_load_refs(repo, 0);
8388 	if (error)
8389 		goto done;
8390 
8391 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8392 	if (view == NULL) {
8393 		error = got_error_from_errno("view_open");
8394 		goto done;
8395 	}
8396 
8397 	error = open_ref_view(view, repo);
8398 	if (error)
8399 		goto done;
8400 
8401 	if (worktree) {
8402 		/* Release work tree lock. */
8403 		got_worktree_close(worktree);
8404 		worktree = NULL;
8405 	}
8406 	error = view_loop(view);
8407 done:
8408 	free(repo_path);
8409 	free(cwd);
8410 	if (repo) {
8411 		const struct got_error *close_err = got_repo_close(repo);
8412 		if (close_err)
8413 			error = close_err;
8414 	}
8415 	if (pack_fds) {
8416 		const struct got_error *pack_err =
8417 		    got_repo_pack_fds_close(pack_fds);
8418 		if (error == NULL)
8419 			error = pack_err;
8420 	}
8421 	tog_free_refs();
8422 	return error;
8423 }
8424 
8425 static const struct got_error*
8426 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8427     const char *str)
8428 {
8429 	size_t len;
8430 
8431 	if (win == NULL)
8432 		win = stdscr;
8433 
8434 	len = strlen(str);
8435 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8436 
8437 	if (focus)
8438 		wstandout(win);
8439 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8440 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8441 	if (focus)
8442 		wstandend(win);
8443 
8444 	return NULL;
8445 }
8446 
8447 static const struct got_error *
8448 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8449 {
8450 	off_t *p;
8451 
8452 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8453 	if (p == NULL) {
8454 		free(*line_offsets);
8455 		*line_offsets = NULL;
8456 		return got_error_from_errno("reallocarray");
8457 	}
8458 
8459 	*line_offsets = p;
8460 	(*line_offsets)[*nlines] = off;
8461 	++(*nlines);
8462 	return NULL;
8463 }
8464 
8465 static const struct got_error *
8466 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8467 {
8468 	*ret = 0;
8469 
8470 	for (;n > 0; --n, ++km) {
8471 		char	*t0, *t, *k;
8472 		size_t	 len = 1;
8473 
8474 		if (km->keys == NULL)
8475 			continue;
8476 
8477 		t = t0 = strdup(km->keys);
8478 		if (t0 == NULL)
8479 			return got_error_from_errno("strdup");
8480 
8481 		len += strlen(t);
8482 		while ((k = strsep(&t, " ")) != NULL)
8483 			len += strlen(k) > 1 ? 2 : 0;
8484 		free(t0);
8485 		*ret = MAX(*ret, len);
8486 	}
8487 
8488 	return NULL;
8489 }
8490 
8491 /*
8492  * Write keymap section headers, keys, and key info in km to f.
8493  * Save line offset to *off. If terminal has UTF8 encoding enabled,
8494  * wrap control and symbolic keys in guillemets, else use <>.
8495  */
8496 static const struct got_error *
8497 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
8498 {
8499 	int n, len = width;
8500 
8501 	if (km->keys) {
8502 		static const char *u8_glyph[] = {
8503 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
8504 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
8505 		};
8506 		char	*t0, *t, *k;
8507 		int	 cs, s, first = 1;
8508 
8509 		cs = got_locale_is_utf8();
8510 
8511 		t = t0 = strdup(km->keys);
8512 		if (t0 == NULL)
8513 			return got_error_from_errno("strdup");
8514 
8515 		len = strlen(km->keys);
8516 		while ((k = strsep(&t, " ")) != NULL) {
8517 			s = strlen(k) > 1;  /* control or symbolic key */
8518 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
8519 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
8520 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
8521 			if (n < 0) {
8522 				free(t0);
8523 				return got_error_from_errno("fprintf");
8524 			}
8525 			first = 0;
8526 			len += s ? 2 : 0;
8527 			*off += n;
8528 		}
8529 		free(t0);
8530 	}
8531 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
8532 	if (n < 0)
8533 		return got_error_from_errno("fprintf");
8534 	*off += n;
8535 
8536 	return NULL;
8537 }
8538 
8539 static const struct got_error *
8540 format_help(struct tog_help_view_state *s)
8541 {
8542 	const struct got_error		*err = NULL;
8543 	off_t				 off = 0;
8544 	int				 i, max, n, show = s->all;
8545 	static const struct tog_key_map	 km[] = {
8546 #define KEYMAP_(info, type)	{ NULL, (info), type }
8547 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
8548 		GENERATE_HELP
8549 #undef KEYMAP_
8550 #undef KEY_
8551 	};
8552 
8553 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
8554 	if (err)
8555 		return err;
8556 
8557 	n = nitems(km);
8558 	err = max_key_str(&max, km, n);
8559 	if (err)
8560 		return err;
8561 
8562 	for (i = 0; i < n; ++i) {
8563 		if (km[i].keys == NULL) {
8564 			show = s->all;
8565 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
8566 			    km[i].type == s->type || s->all)
8567 				show = 1;
8568 		}
8569 		if (show) {
8570 			err = format_help_line(&off, s->f, &km[i], max);
8571 			if (err)
8572 				return err;
8573 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
8574 			if (err)
8575 				return err;
8576 		}
8577 	}
8578 	fputc('\n', s->f);
8579 	++off;
8580 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
8581 	return err;
8582 }
8583 
8584 static const struct got_error *
8585 create_help(struct tog_help_view_state *s)
8586 {
8587 	FILE			*f;
8588 	const struct got_error	*err;
8589 
8590 	free(s->line_offsets);
8591 	s->line_offsets = NULL;
8592 	s->nlines = 0;
8593 
8594 	f = got_opentemp();
8595 	if (f == NULL)
8596 		return got_error_from_errno("got_opentemp");
8597 	s->f = f;
8598 
8599 	err = format_help(s);
8600 	if (err)
8601 		return err;
8602 
8603 	if (s->f && fflush(s->f) != 0)
8604 		return got_error_from_errno("fflush");
8605 
8606 	return NULL;
8607 }
8608 
8609 static const struct got_error *
8610 search_start_help_view(struct tog_view *view)
8611 {
8612 	view->state.help.matched_line = 0;
8613 	return NULL;
8614 }
8615 
8616 static void
8617 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
8618     size_t *nlines, int **first, int **last, int **match, int **selected)
8619 {
8620 	struct tog_help_view_state *s = &view->state.help;
8621 
8622 	*f = s->f;
8623 	*nlines = s->nlines;
8624 	*line_offsets = s->line_offsets;
8625 	*match = &s->matched_line;
8626 	*first = &s->first_displayed_line;
8627 	*last = &s->last_displayed_line;
8628 	*selected = &s->selected_line;
8629 }
8630 
8631 static const struct got_error *
8632 show_help_view(struct tog_view *view)
8633 {
8634 	struct tog_help_view_state	*s = &view->state.help;
8635 	const struct got_error		*err;
8636 	regmatch_t			*regmatch = &view->regmatch;
8637 	wchar_t				*wline;
8638 	char				*line;
8639 	ssize_t				 linelen;
8640 	size_t				 linesz = 0;
8641 	int				 width, nprinted = 0, rc = 0;
8642 	int				 eos = view->nlines;
8643 
8644 	if (view_is_hsplit_top(view))
8645 		--eos;  /* account for border */
8646 
8647 	s->lineno = 0;
8648 	rewind(s->f);
8649 	werase(view->window);
8650 
8651 	if (view->gline > s->nlines - 1)
8652 		view->gline = s->nlines - 1;
8653 
8654 	err = win_draw_center(view->window, 0, 0, view->ncols,
8655 	    view_needs_focus_indication(view),
8656 	    "tog help (press q to return to tog)");
8657 	if (err)
8658 		return err;
8659 	if (eos <= 1)
8660 		return NULL;
8661 	waddstr(view->window, "\n\n");
8662 	eos -= 2;
8663 
8664 	s->eof = 0;
8665 	view->maxx = 0;
8666 	line = NULL;
8667 	while (eos > 0 && nprinted < eos) {
8668 		attr_t attr = 0;
8669 
8670 		linelen = getline(&line, &linesz, s->f);
8671 		if (linelen == -1) {
8672 			if (!feof(s->f)) {
8673 				free(line);
8674 				return got_ferror(s->f, GOT_ERR_IO);
8675 			}
8676 			s->eof = 1;
8677 			break;
8678 		}
8679 		if (++s->lineno < s->first_displayed_line)
8680 			continue;
8681 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
8682 			continue;
8683 		if (s->lineno == view->hiline)
8684 			attr = A_STANDOUT;
8685 
8686 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
8687 		    view->x ? 1 : 0);
8688 		if (err) {
8689 			free(line);
8690 			return err;
8691 		}
8692 		view->maxx = MAX(view->maxx, width);
8693 		free(wline);
8694 		wline = NULL;
8695 
8696 		if (attr)
8697 			wattron(view->window, attr);
8698 		if (s->first_displayed_line + nprinted == s->matched_line &&
8699 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
8700 			err = add_matched_line(&width, line, view->ncols - 1, 0,
8701 			    view->window, view->x, regmatch);
8702 			if (err) {
8703 				free(line);
8704 				return err;
8705 			}
8706 		} else {
8707 			int skip;
8708 
8709 			err = format_line(&wline, &width, &skip, line,
8710 			    view->x, view->ncols - 1, 0, view->x ? 1 : 0);
8711 			if (err) {
8712 				free(line);
8713 				return err;
8714 			}
8715 			rc = waddwstr(view->window, &wline[skip]);
8716 			free(wline);
8717 			wline = NULL;
8718 			if (rc == ERR)
8719 				return got_error_msg(GOT_ERR_IO, "waddwstr");
8720 		}
8721 		if (s->lineno == view->hiline) {
8722 			while (width++ < view->ncols)
8723 				waddch(view->window, ' ');
8724 		} else {
8725 			if (width <= view->ncols)
8726 				waddch(view->window, '\n');
8727 		}
8728 		if (attr)
8729 			wattroff(view->window, attr);
8730 		if (++nprinted == 1)
8731 			s->first_displayed_line = s->lineno;
8732 	}
8733 	free(line);
8734 	if (nprinted > 0)
8735 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
8736 	else
8737 		s->last_displayed_line = s->first_displayed_line;
8738 
8739 	view_border(view);
8740 
8741 	if (s->eof) {
8742 		rc = waddnstr(view->window,
8743 		    "See the tog(1) manual page for full documentation",
8744 		    view->ncols - 1);
8745 		if (rc == ERR)
8746 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8747 	} else {
8748 		wmove(view->window, view->nlines - 1, 0);
8749 		wclrtoeol(view->window);
8750 		wstandout(view->window);
8751 		rc = waddnstr(view->window, "scroll down for more...",
8752 		    view->ncols - 1);
8753 		if (rc == ERR)
8754 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
8755 		if (getcurx(view->window) < view->ncols - 6) {
8756 			rc = wprintw(view->window, "[%.0f%%]",
8757 			    100.00 * s->last_displayed_line / s->nlines);
8758 			if (rc == ERR)
8759 				return got_error_msg(GOT_ERR_IO, "wprintw");
8760 		}
8761 		wstandend(view->window);
8762 	}
8763 
8764 	return NULL;
8765 }
8766 
8767 static const struct got_error *
8768 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
8769 {
8770 	struct tog_help_view_state	*s = &view->state.help;
8771 	const struct got_error		*err = NULL;
8772 	char				*line = NULL;
8773 	ssize_t				 linelen;
8774 	size_t				 linesz = 0;
8775 	int				 eos, nscroll;
8776 
8777 	eos = nscroll = view->nlines;
8778 	if (view_is_hsplit_top(view))
8779 		--eos;  /* border */
8780 
8781 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
8782 
8783 	switch (ch) {
8784 	case '0':
8785 		view->x = 0;
8786 		break;
8787 	case '$':
8788 		view->x = MAX(view->maxx - view->ncols / 3, 0);
8789 		view->count = 0;
8790 		break;
8791 	case KEY_RIGHT:
8792 	case 'l':
8793 		if (view->x + view->ncols / 3 < view->maxx)
8794 			view->x += 2;
8795 		else
8796 			view->count = 0;
8797 		break;
8798 	case KEY_LEFT:
8799 	case 'h':
8800 		view->x -= MIN(view->x, 2);
8801 		if (view->x <= 0)
8802 			view->count = 0;
8803 		break;
8804 	case 'g':
8805 	case KEY_HOME:
8806 		s->first_displayed_line = 1;
8807 		view->count = 0;
8808 		break;
8809 	case 'G':
8810 	case KEY_END:
8811 		view->count = 0;
8812 		if (s->eof)
8813 			break;
8814 		s->first_displayed_line = (s->nlines - eos) + 3;
8815 		s->eof = 1;
8816 		break;
8817 	case 'k':
8818 	case KEY_UP:
8819 		if (s->first_displayed_line > 1)
8820 			--s->first_displayed_line;
8821 		else
8822 			view->count = 0;
8823 		break;
8824 	case CTRL('u'):
8825 	case 'u':
8826 		nscroll /= 2;
8827 		/* FALL THROUGH */
8828 	case KEY_PPAGE:
8829 	case CTRL('b'):
8830 	case 'b':
8831 		if (s->first_displayed_line == 1) {
8832 			view->count = 0;
8833 			break;
8834 		}
8835 		while (--nscroll > 0 && s->first_displayed_line > 1)
8836 			s->first_displayed_line--;
8837 		break;
8838 	case 'j':
8839 	case KEY_DOWN:
8840 	case CTRL('n'):
8841 		if (!s->eof)
8842 			++s->first_displayed_line;
8843 		else
8844 			view->count = 0;
8845 		break;
8846 	case CTRL('d'):
8847 	case 'd':
8848 		nscroll /= 2;
8849 		/* FALL THROUGH */
8850 	case KEY_NPAGE:
8851 	case CTRL('f'):
8852 	case 'f':
8853 	case ' ':
8854 		if (s->eof) {
8855 			view->count = 0;
8856 			break;
8857 		}
8858 		while (!s->eof && --nscroll > 0) {
8859 			linelen = getline(&line, &linesz, s->f);
8860 			s->first_displayed_line++;
8861 			if (linelen == -1) {
8862 				if (feof(s->f))
8863 					s->eof = 1;
8864 				else
8865 					err = got_ferror(s->f, GOT_ERR_IO);
8866 				break;
8867 			}
8868 		}
8869 		free(line);
8870 		break;
8871 	default:
8872 		view->count = 0;
8873 		break;
8874 	}
8875 
8876 	return err;
8877 }
8878 
8879 static const struct got_error *
8880 close_help_view(struct tog_view *view)
8881 {
8882 	struct tog_help_view_state *s = &view->state.help;
8883 
8884 	free(s->line_offsets);
8885 	s->line_offsets = NULL;
8886 	if (fclose(s->f) == EOF)
8887 		return got_error_from_errno("fclose");
8888 
8889 	return NULL;
8890 }
8891 
8892 static const struct got_error *
8893 reset_help_view(struct tog_view *view)
8894 {
8895 	struct tog_help_view_state *s = &view->state.help;
8896 
8897 
8898 	if (s->f && fclose(s->f) == EOF)
8899 		return got_error_from_errno("fclose");
8900 
8901 	wclear(view->window);
8902 	view->count = 0;
8903 	view->x = 0;
8904 	s->all = !s->all;
8905 	s->first_displayed_line = 1;
8906 	s->last_displayed_line = view->nlines;
8907 	s->matched_line = 0;
8908 
8909 	return create_help(s);
8910 }
8911 
8912 static const struct got_error *
8913 open_help_view(struct tog_view *view, struct tog_view *parent)
8914 {
8915 	const struct got_error		*err = NULL;
8916 	struct tog_help_view_state	*s = &view->state.help;
8917 
8918 	s->type = (enum tog_keymap_type)parent->type;
8919 	s->first_displayed_line = 1;
8920 	s->last_displayed_line = view->nlines;
8921 	s->selected_line = 1;
8922 
8923 	view->show = show_help_view;
8924 	view->input = input_help_view;
8925 	view->reset = reset_help_view;
8926 	view->close = close_help_view;
8927 	view->search_start = search_start_help_view;
8928 	view->search_setup = search_setup_help_view;
8929 	view->search_next = search_next_view_match;
8930 
8931 	err = create_help(s);
8932 	return err;
8933 }
8934 
8935 static const struct got_error *
8936 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8937     enum tog_view_type request, int y, int x)
8938 {
8939 	const struct got_error *err = NULL;
8940 
8941 	*new_view = NULL;
8942 
8943 	switch (request) {
8944 	case TOG_VIEW_DIFF:
8945 		if (view->type == TOG_VIEW_LOG) {
8946 			struct tog_log_view_state *s = &view->state.log;
8947 
8948 			err = open_diff_view_for_commit(new_view, y, x,
8949 			    s->selected_entry->commit, s->selected_entry->id,
8950 			    view, s->repo);
8951 		} else
8952 			return got_error_msg(GOT_ERR_NOT_IMPL,
8953 			    "parent/child view pair not supported");
8954 		break;
8955 	case TOG_VIEW_BLAME:
8956 		if (view->type == TOG_VIEW_TREE) {
8957 			struct tog_tree_view_state *s = &view->state.tree;
8958 
8959 			err = blame_tree_entry(new_view, y, x,
8960 			    s->selected_entry, &s->parents, s->commit_id,
8961 			    s->repo);
8962 		} else
8963 			return got_error_msg(GOT_ERR_NOT_IMPL,
8964 			    "parent/child view pair not supported");
8965 		break;
8966 	case TOG_VIEW_LOG:
8967 		if (view->type == TOG_VIEW_BLAME)
8968 			err = log_annotated_line(new_view, y, x,
8969 			    view->state.blame.repo, view->state.blame.id_to_log);
8970 		else if (view->type == TOG_VIEW_TREE)
8971 			err = log_selected_tree_entry(new_view, y, x,
8972 			    &view->state.tree);
8973 		else if (view->type == TOG_VIEW_REF)
8974 			err = log_ref_entry(new_view, y, x,
8975 			    view->state.ref.selected_entry,
8976 			    view->state.ref.repo);
8977 		else
8978 			return got_error_msg(GOT_ERR_NOT_IMPL,
8979 			    "parent/child view pair not supported");
8980 		break;
8981 	case TOG_VIEW_TREE:
8982 		if (view->type == TOG_VIEW_LOG)
8983 			err = browse_commit_tree(new_view, y, x,
8984 			    view->state.log.selected_entry,
8985 			    view->state.log.in_repo_path,
8986 			    view->state.log.head_ref_name,
8987 			    view->state.log.repo);
8988 		else if (view->type == TOG_VIEW_REF)
8989 			err = browse_ref_tree(new_view, y, x,
8990 			    view->state.ref.selected_entry,
8991 			    view->state.ref.repo);
8992 		else
8993 			return got_error_msg(GOT_ERR_NOT_IMPL,
8994 			    "parent/child view pair not supported");
8995 		break;
8996 	case TOG_VIEW_REF:
8997 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8998 		if (*new_view == NULL)
8999 			return got_error_from_errno("view_open");
9000 		if (view->type == TOG_VIEW_LOG)
9001 			err = open_ref_view(*new_view, view->state.log.repo);
9002 		else if (view->type == TOG_VIEW_TREE)
9003 			err = open_ref_view(*new_view, view->state.tree.repo);
9004 		else
9005 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9006 			    "parent/child view pair not supported");
9007 		if (err)
9008 			view_close(*new_view);
9009 		break;
9010 	case TOG_VIEW_HELP:
9011 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9012 		if (*new_view == NULL)
9013 			return got_error_from_errno("view_open");
9014 		err = open_help_view(*new_view, view);
9015 		if (err)
9016 			view_close(*new_view);
9017 		break;
9018 	default:
9019 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9020 	}
9021 
9022 	return err;
9023 }
9024 
9025 /*
9026  * If view was scrolled down to move the selected line into view when opening a
9027  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9028  */
9029 static void
9030 offset_selection_up(struct tog_view *view)
9031 {
9032 	switch (view->type) {
9033 	case TOG_VIEW_BLAME: {
9034 		struct tog_blame_view_state *s = &view->state.blame;
9035 		if (s->first_displayed_line == 1) {
9036 			s->selected_line = MAX(s->selected_line - view->offset,
9037 			    1);
9038 			break;
9039 		}
9040 		if (s->first_displayed_line > view->offset)
9041 			s->first_displayed_line -= view->offset;
9042 		else
9043 			s->first_displayed_line = 1;
9044 		s->selected_line += view->offset;
9045 		break;
9046 	}
9047 	case TOG_VIEW_LOG:
9048 		log_scroll_up(&view->state.log, view->offset);
9049 		view->state.log.selected += view->offset;
9050 		break;
9051 	case TOG_VIEW_REF:
9052 		ref_scroll_up(&view->state.ref, view->offset);
9053 		view->state.ref.selected += view->offset;
9054 		break;
9055 	case TOG_VIEW_TREE:
9056 		tree_scroll_up(&view->state.tree, view->offset);
9057 		view->state.tree.selected += view->offset;
9058 		break;
9059 	default:
9060 		break;
9061 	}
9062 
9063 	view->offset = 0;
9064 }
9065 
9066 /*
9067  * If the selected line is in the section of screen covered by the bottom split,
9068  * scroll down offset lines to move it into view and index its new position.
9069  */
9070 static const struct got_error *
9071 offset_selection_down(struct tog_view *view)
9072 {
9073 	const struct got_error	*err = NULL;
9074 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9075 	int			*selected = NULL;
9076 	int			 header, offset;
9077 
9078 	switch (view->type) {
9079 	case TOG_VIEW_BLAME: {
9080 		struct tog_blame_view_state *s = &view->state.blame;
9081 		header = 3;
9082 		scrolld = NULL;
9083 		if (s->selected_line > view->nlines - header) {
9084 			offset = abs(view->nlines - s->selected_line - header);
9085 			s->first_displayed_line += offset;
9086 			s->selected_line -= offset;
9087 			view->offset = offset;
9088 		}
9089 		break;
9090 	}
9091 	case TOG_VIEW_LOG: {
9092 		struct tog_log_view_state *s = &view->state.log;
9093 		scrolld = &log_scroll_down;
9094 		header = view_is_parent_view(view) ? 3 : 2;
9095 		selected = &s->selected;
9096 		break;
9097 	}
9098 	case TOG_VIEW_REF: {
9099 		struct tog_ref_view_state *s = &view->state.ref;
9100 		scrolld = &ref_scroll_down;
9101 		header = 3;
9102 		selected = &s->selected;
9103 		break;
9104 	}
9105 	case TOG_VIEW_TREE: {
9106 		struct tog_tree_view_state *s = &view->state.tree;
9107 		scrolld = &tree_scroll_down;
9108 		header = 5;
9109 		selected = &s->selected;
9110 		break;
9111 	}
9112 	default:
9113 		selected = NULL;
9114 		scrolld = NULL;
9115 		header = 0;
9116 		break;
9117 	}
9118 
9119 	if (selected && *selected > view->nlines - header) {
9120 		offset = abs(view->nlines - *selected - header);
9121 		view->offset = offset;
9122 		if (scrolld && offset) {
9123 			err = scrolld(view, offset);
9124 			*selected -= offset;
9125 		}
9126 	}
9127 
9128 	return err;
9129 }
9130 
9131 static void
9132 list_commands(FILE *fp)
9133 {
9134 	size_t i;
9135 
9136 	fprintf(fp, "commands:");
9137 	for (i = 0; i < nitems(tog_commands); i++) {
9138 		const struct tog_cmd *cmd = &tog_commands[i];
9139 		fprintf(fp, " %s", cmd->name);
9140 	}
9141 	fputc('\n', fp);
9142 }
9143 
9144 __dead static void
9145 usage(int hflag, int status)
9146 {
9147 	FILE *fp = (status == 0) ? stdout : stderr;
9148 
9149 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9150 	    getprogname());
9151 	if (hflag) {
9152 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9153 		list_commands(fp);
9154 	}
9155 	exit(status);
9156 }
9157 
9158 static char **
9159 make_argv(int argc, ...)
9160 {
9161 	va_list ap;
9162 	char **argv;
9163 	int i;
9164 
9165 	va_start(ap, argc);
9166 
9167 	argv = calloc(argc, sizeof(char *));
9168 	if (argv == NULL)
9169 		err(1, "calloc");
9170 	for (i = 0; i < argc; i++) {
9171 		argv[i] = strdup(va_arg(ap, char *));
9172 		if (argv[i] == NULL)
9173 			err(1, "strdup");
9174 	}
9175 
9176 	va_end(ap);
9177 	return argv;
9178 }
9179 
9180 /*
9181  * Try to convert 'tog path' into a 'tog log path' command.
9182  * The user could simply have mistyped the command rather than knowingly
9183  * provided a path. So check whether argv[0] can in fact be resolved
9184  * to a path in the HEAD commit and print a special error if not.
9185  * This hack is for mpi@ <3
9186  */
9187 static const struct got_error *
9188 tog_log_with_path(int argc, char *argv[])
9189 {
9190 	const struct got_error *error = NULL, *close_err;
9191 	const struct tog_cmd *cmd = NULL;
9192 	struct got_repository *repo = NULL;
9193 	struct got_worktree *worktree = NULL;
9194 	struct got_object_id *commit_id = NULL, *id = NULL;
9195 	struct got_commit_object *commit = NULL;
9196 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9197 	char *commit_id_str = NULL, **cmd_argv = NULL;
9198 	int *pack_fds = NULL;
9199 
9200 	cwd = getcwd(NULL, 0);
9201 	if (cwd == NULL)
9202 		return got_error_from_errno("getcwd");
9203 
9204 	error = got_repo_pack_fds_open(&pack_fds);
9205 	if (error != NULL)
9206 		goto done;
9207 
9208 	error = got_worktree_open(&worktree, cwd);
9209 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9210 		goto done;
9211 
9212 	if (worktree)
9213 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9214 	else
9215 		repo_path = strdup(cwd);
9216 	if (repo_path == NULL) {
9217 		error = got_error_from_errno("strdup");
9218 		goto done;
9219 	}
9220 
9221 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9222 	if (error != NULL)
9223 		goto done;
9224 
9225 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9226 	    repo, worktree);
9227 	if (error)
9228 		goto done;
9229 
9230 	error = tog_load_refs(repo, 0);
9231 	if (error)
9232 		goto done;
9233 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9234 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9235 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9236 	if (error)
9237 		goto done;
9238 
9239 	if (worktree) {
9240 		got_worktree_close(worktree);
9241 		worktree = NULL;
9242 	}
9243 
9244 	error = got_object_open_as_commit(&commit, repo, commit_id);
9245 	if (error)
9246 		goto done;
9247 
9248 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9249 	if (error) {
9250 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9251 			goto done;
9252 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9253 		    getprogname(), argv[0]);
9254 		usage(1, 1);
9255 		/* not reached */
9256 	}
9257 
9258 	error = got_object_id_str(&commit_id_str, commit_id);
9259 	if (error)
9260 		goto done;
9261 
9262 	cmd = &tog_commands[0]; /* log */
9263 	argc = 4;
9264 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9265 	error = cmd->cmd_main(argc, cmd_argv);
9266 done:
9267 	if (repo) {
9268 		close_err = got_repo_close(repo);
9269 		if (error == NULL)
9270 			error = close_err;
9271 	}
9272 	if (commit)
9273 		got_object_commit_close(commit);
9274 	if (worktree)
9275 		got_worktree_close(worktree);
9276 	if (pack_fds) {
9277 		const struct got_error *pack_err =
9278 		    got_repo_pack_fds_close(pack_fds);
9279 		if (error == NULL)
9280 			error = pack_err;
9281 	}
9282 	free(id);
9283 	free(commit_id_str);
9284 	free(commit_id);
9285 	free(cwd);
9286 	free(repo_path);
9287 	free(in_repo_path);
9288 	if (cmd_argv) {
9289 		int i;
9290 		for (i = 0; i < argc; i++)
9291 			free(cmd_argv[i]);
9292 		free(cmd_argv);
9293 	}
9294 	tog_free_refs();
9295 	return error;
9296 }
9297 
9298 int
9299 main(int argc, char *argv[])
9300 {
9301 	const struct got_error *error = NULL;
9302 	const struct tog_cmd *cmd = NULL;
9303 	int ch, hflag = 0, Vflag = 0;
9304 	char **cmd_argv = NULL;
9305 	static const struct option longopts[] = {
9306 	    { "version", no_argument, NULL, 'V' },
9307 	    { NULL, 0, NULL, 0}
9308 	};
9309 	char *diff_algo_str = NULL;
9310 
9311 	if (!isatty(STDIN_FILENO))
9312 		errx(1, "standard input is not a tty");
9313 
9314 	setlocale(LC_CTYPE, "");
9315 
9316 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9317 		switch (ch) {
9318 		case 'h':
9319 			hflag = 1;
9320 			break;
9321 		case 'V':
9322 			Vflag = 1;
9323 			break;
9324 		default:
9325 			usage(hflag, 1);
9326 			/* NOTREACHED */
9327 		}
9328 	}
9329 
9330 	argc -= optind;
9331 	argv += optind;
9332 	optind = 1;
9333 	optreset = 1;
9334 
9335 	if (Vflag) {
9336 		got_version_print_str();
9337 		return 0;
9338 	}
9339 
9340 #ifndef PROFILE
9341 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9342 	    NULL) == -1)
9343 		err(1, "pledge");
9344 #endif
9345 
9346 	if (argc == 0) {
9347 		if (hflag)
9348 			usage(hflag, 0);
9349 		/* Build an argument vector which runs a default command. */
9350 		cmd = &tog_commands[0];
9351 		argc = 1;
9352 		cmd_argv = make_argv(argc, cmd->name);
9353 	} else {
9354 		size_t i;
9355 
9356 		/* Did the user specify a command? */
9357 		for (i = 0; i < nitems(tog_commands); i++) {
9358 			if (strncmp(tog_commands[i].name, argv[0],
9359 			    strlen(argv[0])) == 0) {
9360 				cmd = &tog_commands[i];
9361 				break;
9362 			}
9363 		}
9364 	}
9365 
9366 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9367 	if (diff_algo_str) {
9368 		if (strcasecmp(diff_algo_str, "patience") == 0)
9369 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9370 		if (strcasecmp(diff_algo_str, "myers") == 0)
9371 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9372 	}
9373 
9374 	if (cmd == NULL) {
9375 		if (argc != 1)
9376 			usage(0, 1);
9377 		/* No command specified; try log with a path */
9378 		error = tog_log_with_path(argc, argv);
9379 	} else {
9380 		if (hflag)
9381 			cmd->cmd_usage();
9382 		else
9383 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9384 	}
9385 
9386 	endwin();
9387 	putchar('\n');
9388 	if (cmd_argv) {
9389 		int i;
9390 		for (i = 0; i < argc; i++)
9391 			free(cmd_argv[i]);
9392 		free(cmd_argv);
9393 	}
9394 
9395 	if (error && error->code != GOT_ERR_CANCELLED &&
9396 	    error->code != GOT_ERR_EOF &&
9397 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9398 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9399 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9400 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9401 	return 0;
9402 }