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