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