1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 #define TOG_EOF_STRING	"(END)"
109 
110 struct commit_queue_entry {
111 	TAILQ_ENTRY(commit_queue_entry) entry;
112 	struct got_object_id *id;
113 	struct got_commit_object *commit;
114 	int idx;
115 };
116 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
117 struct commit_queue {
118 	int ncommits;
119 	struct commit_queue_head head;
120 };
121 
122 struct tog_color {
123 	STAILQ_ENTRY(tog_color) entry;
124 	regex_t regex;
125 	short colorpair;
126 };
127 STAILQ_HEAD(tog_colors, tog_color);
128 
129 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
130 static struct got_reflist_object_id_map *tog_refs_idmap;
131 
132 static const struct got_error *
133 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
134     struct got_reference* re2)
135 {
136 	const char *name1 = got_ref_get_name(re1);
137 	const char *name2 = got_ref_get_name(re2);
138 	int isbackup1, isbackup2;
139 
140 	/* Sort backup refs towards the bottom of the list. */
141 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
142 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
143 	if (!isbackup1 && isbackup2) {
144 		*cmp = -1;
145 		return NULL;
146 	} else if (isbackup1 && !isbackup2) {
147 		*cmp = 1;
148 		return NULL;
149 	}
150 
151 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
152 	return NULL;
153 }
154 
155 static const struct got_error *
156 tog_load_refs(struct got_repository *repo, int sort_by_date)
157 {
158 	const struct got_error *err;
159 
160 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
161 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
162 	    repo);
163 	if (err)
164 		return err;
165 
166 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
167 	    repo);
168 }
169 
170 static void
171 tog_free_refs(void)
172 {
173 	if (tog_refs_idmap) {
174 		got_reflist_object_id_map_free(tog_refs_idmap);
175 		tog_refs_idmap = NULL;
176 	}
177 	got_ref_list_free(&tog_refs);
178 }
179 
180 static const struct got_error *
181 add_color(struct tog_colors *colors, const char *pattern,
182     int idx, short color)
183 {
184 	const struct got_error *err = NULL;
185 	struct tog_color *tc;
186 	int regerr = 0;
187 
188 	if (idx < 1 || idx > COLOR_PAIRS - 1)
189 		return NULL;
190 
191 	init_pair(idx, color, -1);
192 
193 	tc = calloc(1, sizeof(*tc));
194 	if (tc == NULL)
195 		return got_error_from_errno("calloc");
196 	regerr = regcomp(&tc->regex, pattern,
197 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
198 	if (regerr) {
199 		static char regerr_msg[512];
200 		static char err_msg[512];
201 		regerror(regerr, &tc->regex, regerr_msg,
202 		    sizeof(regerr_msg));
203 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
204 		    regerr_msg);
205 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
206 		free(tc);
207 		return err;
208 	}
209 	tc->colorpair = idx;
210 	STAILQ_INSERT_HEAD(colors, tc, entry);
211 	return NULL;
212 }
213 
214 static void
215 free_colors(struct tog_colors *colors)
216 {
217 	struct tog_color *tc;
218 
219 	while (!STAILQ_EMPTY(colors)) {
220 		tc = STAILQ_FIRST(colors);
221 		STAILQ_REMOVE_HEAD(colors, entry);
222 		regfree(&tc->regex);
223 		free(tc);
224 	}
225 }
226 
227 struct tog_color *
228 get_color(struct tog_colors *colors, int colorpair)
229 {
230 	struct tog_color *tc = NULL;
231 
232 	STAILQ_FOREACH(tc, colors, entry) {
233 		if (tc->colorpair == colorpair)
234 			return tc;
235 	}
236 
237 	return NULL;
238 }
239 
240 static int
241 default_color_value(const char *envvar)
242 {
243 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
244 		return COLOR_MAGENTA;
245 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
246 		return COLOR_CYAN;
247 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
248 		return COLOR_YELLOW;
249 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
250 		return COLOR_GREEN;
251 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
252 		return COLOR_MAGENTA;
253 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
254 		return COLOR_MAGENTA;
255 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
256 		return COLOR_CYAN;
257 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
258 		return COLOR_GREEN;
259 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
260 		return COLOR_GREEN;
261 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
262 		return COLOR_CYAN;
263 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
264 		return COLOR_YELLOW;
265 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
266 		return COLOR_GREEN;
267 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
270 		return COLOR_YELLOW;
271 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
272 		return COLOR_CYAN;
273 
274 	return -1;
275 }
276 
277 static int
278 get_color_value(const char *envvar)
279 {
280 	const char *val = getenv(envvar);
281 
282 	if (val == NULL)
283 		return default_color_value(envvar);
284 
285 	if (strcasecmp(val, "black") == 0)
286 		return COLOR_BLACK;
287 	if (strcasecmp(val, "red") == 0)
288 		return COLOR_RED;
289 	if (strcasecmp(val, "green") == 0)
290 		return COLOR_GREEN;
291 	if (strcasecmp(val, "yellow") == 0)
292 		return COLOR_YELLOW;
293 	if (strcasecmp(val, "blue") == 0)
294 		return COLOR_BLUE;
295 	if (strcasecmp(val, "magenta") == 0)
296 		return COLOR_MAGENTA;
297 	if (strcasecmp(val, "cyan") == 0)
298 		return COLOR_CYAN;
299 	if (strcasecmp(val, "white") == 0)
300 		return COLOR_WHITE;
301 	if (strcasecmp(val, "default") == 0)
302 		return -1;
303 
304 	return default_color_value(envvar);
305 }
306 
307 
308 struct tog_diff_view_state {
309 	struct got_object_id *id1, *id2;
310 	const char *label1, *label2;
311 	FILE *f, *f1, *f2;
312 	int first_displayed_line;
313 	int last_displayed_line;
314 	int eof;
315 	int diff_context;
316 	int ignore_whitespace;
317 	int force_text_diff;
318 	struct got_repository *repo;
319 	struct tog_colors colors;
320 	size_t nlines;
321 	off_t *line_offsets;
322 	int matched_line;
323 	int selected_line;
324 
325 	/* passed from log view; may be NULL */
326 	struct tog_view *log_view;
327 };
328 
329 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
330 
331 struct tog_log_thread_args {
332 	pthread_cond_t need_commits;
333 	pthread_cond_t commit_loaded;
334 	int commits_needed;
335 	int load_all;
336 	struct got_commit_graph *graph;
337 	struct commit_queue *commits;
338 	const char *in_repo_path;
339 	struct got_object_id *start_id;
340 	struct got_repository *repo;
341 	int *pack_fds;
342 	int log_complete;
343 	sig_atomic_t *quit;
344 	struct commit_queue_entry **first_displayed_entry;
345 	struct commit_queue_entry **selected_entry;
346 	int *searching;
347 	int *search_next_done;
348 	regex_t *regex;
349 };
350 
351 struct tog_log_view_state {
352 	struct commit_queue commits;
353 	struct commit_queue_entry *first_displayed_entry;
354 	struct commit_queue_entry *last_displayed_entry;
355 	struct commit_queue_entry *selected_entry;
356 	int selected;
357 	char *in_repo_path;
358 	char *head_ref_name;
359 	int log_branches;
360 	struct got_repository *repo;
361 	struct got_object_id *start_id;
362 	sig_atomic_t quit;
363 	pthread_t thread;
364 	struct tog_log_thread_args thread_args;
365 	struct commit_queue_entry *matched_entry;
366 	struct commit_queue_entry *search_entry;
367 	struct tog_colors colors;
368 };
369 
370 #define TOG_COLOR_DIFF_MINUS		1
371 #define TOG_COLOR_DIFF_PLUS		2
372 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
373 #define TOG_COLOR_DIFF_META		4
374 #define TOG_COLOR_TREE_SUBMODULE	5
375 #define TOG_COLOR_TREE_SYMLINK		6
376 #define TOG_COLOR_TREE_DIRECTORY	7
377 #define TOG_COLOR_TREE_EXECUTABLE	8
378 #define TOG_COLOR_COMMIT		9
379 #define TOG_COLOR_AUTHOR		10
380 #define TOG_COLOR_DATE			11
381 #define TOG_COLOR_REFS_HEADS		12
382 #define TOG_COLOR_REFS_TAGS		13
383 #define TOG_COLOR_REFS_REMOTES		14
384 #define TOG_COLOR_REFS_BACKUP		15
385 
386 struct tog_blame_cb_args {
387 	struct tog_blame_line *lines; /* one per line */
388 	int nlines;
389 
390 	struct tog_view *view;
391 	struct got_object_id *commit_id;
392 	int *quit;
393 };
394 
395 struct tog_blame_thread_args {
396 	const char *path;
397 	struct got_repository *repo;
398 	struct tog_blame_cb_args *cb_args;
399 	int *complete;
400 	got_cancel_cb cancel_cb;
401 	void *cancel_arg;
402 };
403 
404 struct tog_blame {
405 	FILE *f;
406 	off_t filesize;
407 	struct tog_blame_line *lines;
408 	int nlines;
409 	off_t *line_offsets;
410 	pthread_t thread;
411 	struct tog_blame_thread_args thread_args;
412 	struct tog_blame_cb_args cb_args;
413 	const char *path;
414 	int *pack_fds;
415 };
416 
417 struct tog_blame_view_state {
418 	int first_displayed_line;
419 	int last_displayed_line;
420 	int selected_line;
421 	int blame_complete;
422 	int eof;
423 	int done;
424 	struct got_object_id_queue blamed_commits;
425 	struct got_object_qid *blamed_commit;
426 	char *path;
427 	struct got_repository *repo;
428 	struct got_object_id *commit_id;
429 	struct tog_blame blame;
430 	int matched_line;
431 	struct tog_colors colors;
432 };
433 
434 struct tog_parent_tree {
435 	TAILQ_ENTRY(tog_parent_tree) entry;
436 	struct got_tree_object *tree;
437 	struct got_tree_entry *first_displayed_entry;
438 	struct got_tree_entry *selected_entry;
439 	int selected;
440 };
441 
442 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
443 
444 struct tog_tree_view_state {
445 	char *tree_label;
446 	struct got_object_id *commit_id;/* commit which this tree belongs to */
447 	struct got_tree_object *root;	/* the commit's root tree entry */
448 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
449 	struct got_tree_entry *first_displayed_entry;
450 	struct got_tree_entry *last_displayed_entry;
451 	struct got_tree_entry *selected_entry;
452 	int ndisplayed, selected, show_ids;
453 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
454 	char *head_ref_name;
455 	struct got_repository *repo;
456 	struct got_tree_entry *matched_entry;
457 	struct tog_colors colors;
458 };
459 
460 struct tog_reflist_entry {
461 	TAILQ_ENTRY(tog_reflist_entry) entry;
462 	struct got_reference *ref;
463 	int idx;
464 };
465 
466 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
467 
468 struct tog_ref_view_state {
469 	struct tog_reflist_head refs;
470 	struct tog_reflist_entry *first_displayed_entry;
471 	struct tog_reflist_entry *last_displayed_entry;
472 	struct tog_reflist_entry *selected_entry;
473 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
474 	struct got_repository *repo;
475 	struct tog_reflist_entry *matched_entry;
476 	struct tog_colors colors;
477 };
478 
479 /*
480  * We implement two types of views: parent views and child views.
481  *
482  * The 'Tab' key switches focus between a parent view and its child view.
483  * Child views are shown side-by-side to their parent view, provided
484  * there is enough screen estate.
485  *
486  * When a new view is opened from within a parent view, this new view
487  * becomes a child view of the parent view, replacing any existing child.
488  *
489  * When a new view is opened from within a child view, this new view
490  * becomes a parent view which will obscure the views below until the
491  * user quits the new parent view by typing 'q'.
492  *
493  * This list of views contains parent views only.
494  * Child views are only pointed to by their parent view.
495  */
496 TAILQ_HEAD(tog_view_list_head, tog_view);
497 
498 struct tog_view {
499 	TAILQ_ENTRY(tog_view) entry;
500 	WINDOW *window;
501 	PANEL *panel;
502 	int nlines, ncols, begin_y, begin_x;
503 	int maxx, x; /* max column and current start column */
504 	int lines, cols; /* copies of LINES and COLS */
505 	int ch, count; /* current keymap and count prefix */
506 	int focussed; /* Only set on one parent or child view at a time. */
507 	int dying;
508 	struct tog_view *parent;
509 	struct tog_view *child;
510 
511 	/*
512 	 * This flag is initially set on parent views when a new child view
513 	 * is created. It gets toggled when the 'Tab' key switches focus
514 	 * between parent and child.
515 	 * The flag indicates whether focus should be passed on to our child
516 	 * view if this parent view gets picked for focus after another parent
517 	 * view was closed. This prevents child views from losing focus in such
518 	 * situations.
519 	 */
520 	int focus_child;
521 
522 	/* type-specific state */
523 	enum tog_view_type type;
524 	union {
525 		struct tog_diff_view_state diff;
526 		struct tog_log_view_state log;
527 		struct tog_blame_view_state blame;
528 		struct tog_tree_view_state tree;
529 		struct tog_ref_view_state ref;
530 	} state;
531 
532 	const struct got_error *(*show)(struct tog_view *);
533 	const struct got_error *(*input)(struct tog_view **,
534 	    struct tog_view *, int);
535 	const struct got_error *(*close)(struct tog_view *);
536 
537 	const struct got_error *(*search_start)(struct tog_view *);
538 	const struct got_error *(*search_next)(struct tog_view *);
539 	int search_started;
540 	int searching;
541 #define TOG_SEARCH_FORWARD	1
542 #define TOG_SEARCH_BACKWARD	2
543 	int search_next_done;
544 #define TOG_SEARCH_HAVE_MORE	1
545 #define TOG_SEARCH_NO_MORE	2
546 #define TOG_SEARCH_HAVE_NONE	3
547 	regex_t regex;
548 	regmatch_t regmatch;
549 };
550 
551 static const struct got_error *open_diff_view(struct tog_view *,
552     struct got_object_id *, struct got_object_id *,
553     const char *, const char *, int, int, int, struct tog_view *,
554     struct got_repository *);
555 static const struct got_error *show_diff_view(struct tog_view *);
556 static const struct got_error *input_diff_view(struct tog_view **,
557     struct tog_view *, int);
558 static const struct got_error* close_diff_view(struct tog_view *);
559 static const struct got_error *search_start_diff_view(struct tog_view *);
560 static const struct got_error *search_next_diff_view(struct tog_view *);
561 
562 static const struct got_error *open_log_view(struct tog_view *,
563     struct got_object_id *, struct got_repository *,
564     const char *, const char *, int);
565 static const struct got_error * show_log_view(struct tog_view *);
566 static const struct got_error *input_log_view(struct tog_view **,
567     struct tog_view *, int);
568 static const struct got_error *close_log_view(struct tog_view *);
569 static const struct got_error *search_start_log_view(struct tog_view *);
570 static const struct got_error *search_next_log_view(struct tog_view *);
571 
572 static const struct got_error *open_blame_view(struct tog_view *, char *,
573     struct got_object_id *, struct got_repository *);
574 static const struct got_error *show_blame_view(struct tog_view *);
575 static const struct got_error *input_blame_view(struct tog_view **,
576     struct tog_view *, int);
577 static const struct got_error *close_blame_view(struct tog_view *);
578 static const struct got_error *search_start_blame_view(struct tog_view *);
579 static const struct got_error *search_next_blame_view(struct tog_view *);
580 
581 static const struct got_error *open_tree_view(struct tog_view *,
582     struct got_object_id *, const char *, struct got_repository *);
583 static const struct got_error *show_tree_view(struct tog_view *);
584 static const struct got_error *input_tree_view(struct tog_view **,
585     struct tog_view *, int);
586 static const struct got_error *close_tree_view(struct tog_view *);
587 static const struct got_error *search_start_tree_view(struct tog_view *);
588 static const struct got_error *search_next_tree_view(struct tog_view *);
589 
590 static const struct got_error *open_ref_view(struct tog_view *,
591     struct got_repository *);
592 static const struct got_error *show_ref_view(struct tog_view *);
593 static const struct got_error *input_ref_view(struct tog_view **,
594     struct tog_view *, int);
595 static const struct got_error *close_ref_view(struct tog_view *);
596 static const struct got_error *search_start_ref_view(struct tog_view *);
597 static const struct got_error *search_next_ref_view(struct tog_view *);
598 
599 static volatile sig_atomic_t tog_sigwinch_received;
600 static volatile sig_atomic_t tog_sigpipe_received;
601 static volatile sig_atomic_t tog_sigcont_received;
602 static volatile sig_atomic_t tog_sigint_received;
603 static volatile sig_atomic_t tog_sigterm_received;
604 
605 static void
606 tog_sigwinch(int signo)
607 {
608 	tog_sigwinch_received = 1;
609 }
610 
611 static void
612 tog_sigpipe(int signo)
613 {
614 	tog_sigpipe_received = 1;
615 }
616 
617 static void
618 tog_sigcont(int signo)
619 {
620 	tog_sigcont_received = 1;
621 }
622 
623 static void
624 tog_sigint(int signo)
625 {
626 	tog_sigint_received = 1;
627 }
628 
629 static void
630 tog_sigterm(int signo)
631 {
632 	tog_sigterm_received = 1;
633 }
634 
635 static int
636 tog_fatal_signal_received(void)
637 {
638 	return (tog_sigpipe_received ||
639 	    tog_sigint_received || tog_sigint_received);
640 }
641 
642 
643 static const struct got_error *
644 view_close(struct tog_view *view)
645 {
646 	const struct got_error *err = NULL;
647 
648 	if (view->child) {
649 		view_close(view->child);
650 		view->child = NULL;
651 	}
652 	if (view->close)
653 		err = view->close(view);
654 	if (view->panel)
655 		del_panel(view->panel);
656 	if (view->window)
657 		delwin(view->window);
658 	free(view);
659 	return err;
660 }
661 
662 static struct tog_view *
663 view_open(int nlines, int ncols, int begin_y, int begin_x,
664     enum tog_view_type type)
665 {
666 	struct tog_view *view = calloc(1, sizeof(*view));
667 
668 	if (view == NULL)
669 		return NULL;
670 
671 	view->ch = 0;
672 	view->count = 0;
673 	view->type = type;
674 	view->lines = LINES;
675 	view->cols = COLS;
676 	view->nlines = nlines ? nlines : LINES - begin_y;
677 	view->ncols = ncols ? ncols : COLS - begin_x;
678 	view->begin_y = begin_y;
679 	view->begin_x = begin_x;
680 	view->window = newwin(nlines, ncols, begin_y, begin_x);
681 	if (view->window == NULL) {
682 		view_close(view);
683 		return NULL;
684 	}
685 	view->panel = new_panel(view->window);
686 	if (view->panel == NULL ||
687 	    set_panel_userptr(view->panel, view) != OK) {
688 		view_close(view);
689 		return NULL;
690 	}
691 
692 	keypad(view->window, TRUE);
693 	return view;
694 }
695 
696 static int
697 view_split_begin_x(int begin_x)
698 {
699 	if (begin_x > 0 || COLS < 120)
700 		return 0;
701 	return (COLS - MAX(COLS / 2, 80));
702 }
703 
704 static const struct got_error *view_resize(struct tog_view *);
705 
706 static const struct got_error *
707 view_splitscreen(struct tog_view *view)
708 {
709 	const struct got_error *err = NULL;
710 
711 	view->begin_y = 0;
712 	view->begin_x = view_split_begin_x(0);
713 	view->nlines = LINES;
714 	view->ncols = COLS - view->begin_x;
715 	view->lines = LINES;
716 	view->cols = COLS;
717 	err = view_resize(view);
718 	if (err)
719 		return err;
720 
721 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
722 		return got_error_from_errno("mvwin");
723 
724 	return NULL;
725 }
726 
727 static const struct got_error *
728 view_fullscreen(struct tog_view *view)
729 {
730 	const struct got_error *err = NULL;
731 
732 	view->begin_x = 0;
733 	view->begin_y = 0;
734 	view->nlines = LINES;
735 	view->ncols = COLS;
736 	view->lines = LINES;
737 	view->cols = COLS;
738 	err = view_resize(view);
739 	if (err)
740 		return err;
741 
742 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
743 		return got_error_from_errno("mvwin");
744 
745 	return NULL;
746 }
747 
748 static int
749 view_is_parent_view(struct tog_view *view)
750 {
751 	return view->parent == NULL;
752 }
753 
754 static int
755 view_is_splitscreen(struct tog_view *view)
756 {
757 	return view->begin_x > 0;
758 }
759 
760 
761 static const struct got_error *
762 view_resize(struct tog_view *view)
763 {
764 	int nlines, ncols;
765 
766 	if (view->lines > LINES)
767 		nlines = view->nlines - (view->lines - LINES);
768 	else
769 		nlines = view->nlines + (LINES - view->lines);
770 
771 	if (view->cols > COLS)
772 		ncols = view->ncols - (view->cols - COLS);
773 	else
774 		ncols = view->ncols + (COLS - view->cols);
775 
776 	if (view->child && view_is_splitscreen(view->child)) {
777 		view->child->begin_x = view_split_begin_x(view->begin_x);
778 		if (view->child->begin_x == 0) {
779 			ncols = COLS;
780 
781 			view_fullscreen(view->child);
782 			if (view->child->focussed)
783 				show_panel(view->child->panel);
784 			else
785 				show_panel(view->panel);
786 		} else {
787 			ncols = view->child->begin_x;
788 
789 			view_splitscreen(view->child);
790 			show_panel(view->child->panel);
791 		}
792 	} else if (view->parent == NULL)
793 		ncols = COLS;
794 
795 	if (wresize(view->window, nlines, ncols) == ERR)
796 		return got_error_from_errno("wresize");
797 	if (replace_panel(view->panel, view->window) == ERR)
798 		return got_error_from_errno("replace_panel");
799 	wclear(view->window);
800 
801 	view->nlines = nlines;
802 	view->ncols = ncols;
803 	view->lines = LINES;
804 	view->cols = COLS;
805 
806 	return NULL;
807 }
808 
809 static const struct got_error *
810 view_close_child(struct tog_view *view)
811 {
812 	const struct got_error *err = NULL;
813 
814 	if (view->child == NULL)
815 		return NULL;
816 
817 	err = view_close(view->child);
818 	view->child = NULL;
819 	return err;
820 }
821 
822 static const struct got_error *
823 view_set_child(struct tog_view *view, struct tog_view *child)
824 {
825 	view->child = child;
826 	child->parent = view;
827 
828 	return view_resize(view);
829 }
830 
831 static void
832 tog_resizeterm(void)
833 {
834 	int cols, lines;
835 	struct winsize size;
836 
837 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
838 		cols = 80;     /* Default */
839 		lines = 24;
840 	} else {
841 		cols = size.ws_col;
842 		lines = size.ws_row;
843 	}
844 	resize_term(lines, cols);
845 }
846 
847 static const struct got_error *
848 view_search_start(struct tog_view *view)
849 {
850 	const struct got_error *err = NULL;
851 	char pattern[1024];
852 	int ret;
853 
854 	if (view->search_started) {
855 		regfree(&view->regex);
856 		view->searching = 0;
857 		memset(&view->regmatch, 0, sizeof(view->regmatch));
858 	}
859 	view->search_started = 0;
860 
861 	if (view->nlines < 1)
862 		return NULL;
863 
864 	mvwaddstr(view->window, view->begin_y + view->nlines - 1, 0, "/");
865 	wclrtoeol(view->window);
866 
867 	nocbreak();
868 	echo();
869 	ret = wgetnstr(view->window, pattern, sizeof(pattern));
870 	cbreak();
871 	noecho();
872 	if (ret == ERR)
873 		return NULL;
874 
875 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
876 		err = view->search_start(view);
877 		if (err) {
878 			regfree(&view->regex);
879 			return err;
880 		}
881 		view->search_started = 1;
882 		view->searching = TOG_SEARCH_FORWARD;
883 		view->search_next_done = 0;
884 		view->search_next(view);
885 	}
886 
887 	return NULL;
888 }
889 
890 /*
891  * Compute view->count from numeric user input.  User has five-tenths of a
892  * second to follow each numeric keypress with another number to form count.
893  * Return first non-numeric input or ERR and assign total to view->count.
894  * XXX Should we add support for user-defined timeout?
895  */
896 static int
897 get_compound_key(struct tog_view *view, int c)
898 {
899 	int n = 0;
900 
901 	view->count = 0;
902 	halfdelay(5);  /* block for half a second */
903 
904 	do {
905 		/*
906 		 * Don't overflow. Max valid request should be the greatest
907 		 * between the longest and total lines; cap at 10 million.
908 		 */
909 		if (n >= 9999999)
910 			n = 9999999;
911 		else
912 			n = n * 10 + (c - '0');
913 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
914 
915 	/* Massage excessive or inapplicable values at the input handler. */
916 	view->count = n;
917 
918 	cbreak();  /* return to blocking */
919 	return c;
920 }
921 
922 static const struct got_error *
923 view_input(struct tog_view **new, int *done, struct tog_view *view,
924     struct tog_view_list_head *views)
925 {
926 	const struct got_error *err = NULL;
927 	struct tog_view *v;
928 	int ch, errcode;
929 
930 	*new = NULL;
931 
932 	/* Clear "no matches" indicator. */
933 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
934 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
935 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
936 		view->count = 0;
937 	}
938 
939 	if (view->searching && !view->search_next_done) {
940 		errcode = pthread_mutex_unlock(&tog_mutex);
941 		if (errcode)
942 			return got_error_set_errno(errcode,
943 			    "pthread_mutex_unlock");
944 		sched_yield();
945 		errcode = pthread_mutex_lock(&tog_mutex);
946 		if (errcode)
947 			return got_error_set_errno(errcode,
948 			    "pthread_mutex_lock");
949 		view->search_next(view);
950 		return NULL;
951 	}
952 
953 	nodelay(stdscr, FALSE);
954 	/* Allow threads to make progress while we are waiting for input. */
955 	errcode = pthread_mutex_unlock(&tog_mutex);
956 	if (errcode)
957 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
958 	/* If we have an unfinished count, don't get a new key map. */
959 	ch = view->ch;
960 	if ((view->count && --view->count == 0) || !view->count) {
961 		ch = wgetch(view->window);
962 		if (ch >= '1' && ch  <= '9')
963 			view->ch = ch = get_compound_key(view, ch);
964 	}
965 	errcode = pthread_mutex_lock(&tog_mutex);
966 	if (errcode)
967 		return got_error_set_errno(errcode, "pthread_mutex_lock");
968 	nodelay(stdscr, TRUE);
969 
970 	if (tog_sigwinch_received || tog_sigcont_received) {
971 		tog_resizeterm();
972 		tog_sigwinch_received = 0;
973 		tog_sigcont_received = 0;
974 		TAILQ_FOREACH(v, views, entry) {
975 			err = view_resize(v);
976 			if (err)
977 				return err;
978 			err = v->input(new, v, KEY_RESIZE);
979 			if (err)
980 				return err;
981 			if (v->child) {
982 				err = view_resize(v->child);
983 				if (err)
984 					return err;
985 				err = v->child->input(new, v->child,
986 				    KEY_RESIZE);
987 				if (err)
988 					return err;
989 			}
990 		}
991 	}
992 
993 	switch (ch) {
994 	case '\t':
995 		view->count = 0;
996 		if (view->child) {
997 			view->focussed = 0;
998 			view->child->focussed = 1;
999 			view->focus_child = 1;
1000 		} else if (view->parent) {
1001 			view->focussed = 0;
1002 			view->parent->focussed = 1;
1003 			view->parent->focus_child = 0;
1004 			if (!view_is_splitscreen(view))
1005 				err = view_fullscreen(view->parent);
1006 		}
1007 		break;
1008 	case 'q':
1009 		err = view->input(new, view, ch);
1010 		view->dying = 1;
1011 		break;
1012 	case 'Q':
1013 		*done = 1;
1014 		break;
1015 	case 'F':
1016 		view->count = 0;
1017 		if (view_is_parent_view(view)) {
1018 			if (view->child == NULL)
1019 				break;
1020 			if (view_is_splitscreen(view->child)) {
1021 				view->focussed = 0;
1022 				view->child->focussed = 1;
1023 				err = view_fullscreen(view->child);
1024 			} else
1025 				err = view_splitscreen(view->child);
1026 			if (err)
1027 				break;
1028 			err = view->child->input(new, view->child,
1029 			    KEY_RESIZE);
1030 		} else {
1031 			if (view_is_splitscreen(view)) {
1032 				view->parent->focussed = 0;
1033 				view->focussed = 1;
1034 				err = view_fullscreen(view);
1035 			} else {
1036 				err = view_splitscreen(view);
1037 				if (!err)
1038 					err = view_resize(view->parent);
1039 			}
1040 			if (err)
1041 				break;
1042 			err = view->input(new, view, KEY_RESIZE);
1043 		}
1044 		break;
1045 	case KEY_RESIZE:
1046 		break;
1047 	case '/':
1048 		view->count = 0;
1049 		if (view->search_start)
1050 			view_search_start(view);
1051 		else
1052 			err = view->input(new, view, ch);
1053 		break;
1054 	case 'N':
1055 	case 'n':
1056 		if (view->search_started && view->search_next) {
1057 			view->searching = (ch == 'n' ?
1058 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1059 			view->search_next_done = 0;
1060 			view->search_next(view);
1061 		} else
1062 			err = view->input(new, view, ch);
1063 		break;
1064 	default:
1065 		err = view->input(new, view, ch);
1066 		break;
1067 	}
1068 
1069 	return err;
1070 }
1071 
1072 void
1073 view_vborder(struct tog_view *view)
1074 {
1075 	PANEL *panel;
1076 	const struct tog_view *view_above;
1077 
1078 	if (view->parent)
1079 		return view_vborder(view->parent);
1080 
1081 	panel = panel_above(view->panel);
1082 	if (panel == NULL)
1083 		return;
1084 
1085 	view_above = panel_userptr(panel);
1086 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
1087 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
1088 }
1089 
1090 int
1091 view_needs_focus_indication(struct tog_view *view)
1092 {
1093 	if (view_is_parent_view(view)) {
1094 		if (view->child == NULL || view->child->focussed)
1095 			return 0;
1096 		if (!view_is_splitscreen(view->child))
1097 			return 0;
1098 	} else if (!view_is_splitscreen(view))
1099 		return 0;
1100 
1101 	return view->focussed;
1102 }
1103 
1104 static const struct got_error *
1105 view_loop(struct tog_view *view)
1106 {
1107 	const struct got_error *err = NULL;
1108 	struct tog_view_list_head views;
1109 	struct tog_view *new_view;
1110 	int fast_refresh = 10;
1111 	int done = 0, errcode;
1112 
1113 	errcode = pthread_mutex_lock(&tog_mutex);
1114 	if (errcode)
1115 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1116 
1117 	TAILQ_INIT(&views);
1118 	TAILQ_INSERT_HEAD(&views, view, entry);
1119 
1120 	view->focussed = 1;
1121 	err = view->show(view);
1122 	if (err)
1123 		return err;
1124 	update_panels();
1125 	doupdate();
1126 	while (!TAILQ_EMPTY(&views) && !done && !tog_fatal_signal_received()) {
1127 		/* Refresh fast during initialization, then become slower. */
1128 		if (fast_refresh && fast_refresh-- == 0)
1129 			halfdelay(10); /* switch to once per second */
1130 
1131 		err = view_input(&new_view, &done, view, &views);
1132 		if (err)
1133 			break;
1134 		if (view->dying) {
1135 			struct tog_view *v, *prev = NULL;
1136 
1137 			if (view_is_parent_view(view))
1138 				prev = TAILQ_PREV(view, tog_view_list_head,
1139 				    entry);
1140 			else if (view->parent)
1141 				prev = view->parent;
1142 
1143 			if (view->parent) {
1144 				view->parent->child = NULL;
1145 				view->parent->focus_child = 0;
1146 
1147 				err = view_resize(view->parent);
1148 				if (err)
1149 					break;
1150 			} else
1151 				TAILQ_REMOVE(&views, view, entry);
1152 
1153 			err = view_close(view);
1154 			if (err)
1155 				goto done;
1156 
1157 			view = NULL;
1158 			TAILQ_FOREACH(v, &views, entry) {
1159 				if (v->focussed)
1160 					break;
1161 			}
1162 			if (view == NULL && new_view == NULL) {
1163 				/* No view has focus. Try to pick one. */
1164 				if (prev)
1165 					view = prev;
1166 				else if (!TAILQ_EMPTY(&views)) {
1167 					view = TAILQ_LAST(&views,
1168 					    tog_view_list_head);
1169 				}
1170 				if (view) {
1171 					if (view->focus_child) {
1172 						view->child->focussed = 1;
1173 						view = view->child;
1174 					} else
1175 						view->focussed = 1;
1176 				}
1177 			}
1178 		}
1179 		if (new_view) {
1180 			struct tog_view *v, *t;
1181 			/* Only allow one parent view per type. */
1182 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1183 				if (v->type != new_view->type)
1184 					continue;
1185 				TAILQ_REMOVE(&views, v, entry);
1186 				err = view_close(v);
1187 				if (err)
1188 					goto done;
1189 				break;
1190 			}
1191 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1192 			view = new_view;
1193 		}
1194 		if (view) {
1195 			if (view_is_parent_view(view)) {
1196 				if (view->child && view->child->focussed)
1197 					view = view->child;
1198 			} else {
1199 				if (view->parent && view->parent->focussed)
1200 					view = view->parent;
1201 			}
1202 			show_panel(view->panel);
1203 			if (view->child && view_is_splitscreen(view->child))
1204 				show_panel(view->child->panel);
1205 			if (view->parent && view_is_splitscreen(view)) {
1206 				err = view->parent->show(view->parent);
1207 				if (err)
1208 					goto done;
1209 			}
1210 			err = view->show(view);
1211 			if (err)
1212 				goto done;
1213 			if (view->child) {
1214 				err = view->child->show(view->child);
1215 				if (err)
1216 					goto done;
1217 			}
1218 			update_panels();
1219 			doupdate();
1220 		}
1221 	}
1222 done:
1223 	while (!TAILQ_EMPTY(&views)) {
1224 		view = TAILQ_FIRST(&views);
1225 		TAILQ_REMOVE(&views, view, entry);
1226 		view_close(view);
1227 	}
1228 
1229 	errcode = pthread_mutex_unlock(&tog_mutex);
1230 	if (errcode && err == NULL)
1231 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1232 
1233 	return err;
1234 }
1235 
1236 __dead static void
1237 usage_log(void)
1238 {
1239 	endwin();
1240 	fprintf(stderr,
1241 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1242 	    getprogname());
1243 	exit(1);
1244 }
1245 
1246 /* Create newly allocated wide-character string equivalent to a byte string. */
1247 static const struct got_error *
1248 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1249 {
1250 	char *vis = NULL;
1251 	const struct got_error *err = NULL;
1252 
1253 	*ws = NULL;
1254 	*wlen = mbstowcs(NULL, s, 0);
1255 	if (*wlen == (size_t)-1) {
1256 		int vislen;
1257 		if (errno != EILSEQ)
1258 			return got_error_from_errno("mbstowcs");
1259 
1260 		/* byte string invalid in current encoding; try to "fix" it */
1261 		err = got_mbsavis(&vis, &vislen, s);
1262 		if (err)
1263 			return err;
1264 		*wlen = mbstowcs(NULL, vis, 0);
1265 		if (*wlen == (size_t)-1) {
1266 			err = got_error_from_errno("mbstowcs"); /* give up */
1267 			goto done;
1268 		}
1269 	}
1270 
1271 	*ws = calloc(*wlen + 1, sizeof(**ws));
1272 	if (*ws == NULL) {
1273 		err = got_error_from_errno("calloc");
1274 		goto done;
1275 	}
1276 
1277 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1278 		err = got_error_from_errno("mbstowcs");
1279 done:
1280 	free(vis);
1281 	if (err) {
1282 		free(*ws);
1283 		*ws = NULL;
1284 		*wlen = 0;
1285 	}
1286 	return err;
1287 }
1288 
1289 static const struct got_error *
1290 expand_tab(char **ptr, const char *src)
1291 {
1292 	char	*dst;
1293 	size_t	 len, n, idx = 0, sz = 0;
1294 
1295 	*ptr = NULL;
1296 	n = len = strlen(src);
1297 	dst = malloc(n + 1);
1298 	if (dst == NULL)
1299 		return got_error_from_errno("malloc");
1300 
1301 	while (idx < len && src[idx]) {
1302 		const char c = src[idx];
1303 
1304 		if (c == '\t') {
1305 			size_t nb = TABSIZE - sz % TABSIZE;
1306 			char *p;
1307 
1308 			p = realloc(dst, n + nb);
1309 			if (p == NULL) {
1310 				free(dst);
1311 				return got_error_from_errno("realloc");
1312 
1313 			}
1314 			dst = p;
1315 			n += nb;
1316 			memset(dst + sz, ' ', nb);
1317 			sz += nb;
1318 		} else
1319 			dst[sz++] = src[idx];
1320 		++idx;
1321 	}
1322 
1323 	dst[sz] = '\0';
1324 	*ptr = dst;
1325 	return NULL;
1326 }
1327 
1328 /*
1329  * Advance at most n columns from wline starting at offset off.
1330  * Return the index to the first character after the span operation.
1331  * Return the combined column width of all spanned wide character in
1332  * *rcol.
1333  */
1334 static int
1335 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1336 {
1337 	int width, i, cols = 0;
1338 
1339 	if (n == 0) {
1340 		*rcol = cols;
1341 		return off;
1342 	}
1343 
1344 	for (i = off; wline[i] != L'\0'; ++i) {
1345 		if (wline[i] == L'\t')
1346 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1347 		else
1348 			width = wcwidth(wline[i]);
1349 
1350 		if (width == -1) {
1351 			width = 1;
1352 			wline[i] = L'.';
1353 		}
1354 
1355 		if (cols + width > n)
1356 			break;
1357 		cols += width;
1358 	}
1359 
1360 	*rcol = cols;
1361 	return i;
1362 }
1363 
1364 /*
1365  * Format a line for display, ensuring that it won't overflow a width limit.
1366  * With scrolling, the width returned refers to the scrolled version of the
1367  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1368  */
1369 static const struct got_error *
1370 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1371     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1372 {
1373 	const struct got_error *err = NULL;
1374 	int cols;
1375 	wchar_t *wline = NULL;
1376 	char *exstr = NULL;
1377 	size_t wlen;
1378 	int i, scrollx;
1379 
1380 	*wlinep = NULL;
1381 	*widthp = 0;
1382 
1383 	if (expand) {
1384 		err = expand_tab(&exstr, line);
1385 		if (err)
1386 			return err;
1387 	}
1388 
1389 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1390 	free(exstr);
1391 	if (err)
1392 		return err;
1393 
1394 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1395 
1396 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1397 		wline[wlen - 1] = L'\0';
1398 		wlen--;
1399 	}
1400 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1401 		wline[wlen - 1] = L'\0';
1402 		wlen--;
1403 	}
1404 
1405 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1406 	wline[i] = L'\0';
1407 
1408 	if (widthp)
1409 		*widthp = cols;
1410 	if (scrollxp)
1411 		*scrollxp = scrollx;
1412 	if (err)
1413 		free(wline);
1414 	else
1415 		*wlinep = wline;
1416 	return err;
1417 }
1418 
1419 static const struct got_error*
1420 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1421     struct got_object_id *id, struct got_repository *repo)
1422 {
1423 	static const struct got_error *err = NULL;
1424 	struct got_reflist_entry *re;
1425 	char *s;
1426 	const char *name;
1427 
1428 	*refs_str = NULL;
1429 
1430 	TAILQ_FOREACH(re, refs, entry) {
1431 		struct got_tag_object *tag = NULL;
1432 		struct got_object_id *ref_id;
1433 		int cmp;
1434 
1435 		name = got_ref_get_name(re->ref);
1436 		if (strcmp(name, GOT_REF_HEAD) == 0)
1437 			continue;
1438 		if (strncmp(name, "refs/", 5) == 0)
1439 			name += 5;
1440 		if (strncmp(name, "got/", 4) == 0 &&
1441 		    strncmp(name, "got/backup/", 11) != 0)
1442 			continue;
1443 		if (strncmp(name, "heads/", 6) == 0)
1444 			name += 6;
1445 		if (strncmp(name, "remotes/", 8) == 0) {
1446 			name += 8;
1447 			s = strstr(name, "/" GOT_REF_HEAD);
1448 			if (s != NULL && s[strlen(s)] == '\0')
1449 				continue;
1450 		}
1451 		err = got_ref_resolve(&ref_id, repo, re->ref);
1452 		if (err)
1453 			break;
1454 		if (strncmp(name, "tags/", 5) == 0) {
1455 			err = got_object_open_as_tag(&tag, repo, ref_id);
1456 			if (err) {
1457 				if (err->code != GOT_ERR_OBJ_TYPE) {
1458 					free(ref_id);
1459 					break;
1460 				}
1461 				/* Ref points at something other than a tag. */
1462 				err = NULL;
1463 				tag = NULL;
1464 			}
1465 		}
1466 		cmp = got_object_id_cmp(tag ?
1467 		    got_object_tag_get_object_id(tag) : ref_id, id);
1468 		free(ref_id);
1469 		if (tag)
1470 			got_object_tag_close(tag);
1471 		if (cmp != 0)
1472 			continue;
1473 		s = *refs_str;
1474 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1475 		    s ? ", " : "", name) == -1) {
1476 			err = got_error_from_errno("asprintf");
1477 			free(s);
1478 			*refs_str = NULL;
1479 			break;
1480 		}
1481 		free(s);
1482 	}
1483 
1484 	return err;
1485 }
1486 
1487 static const struct got_error *
1488 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1489     int col_tab_align)
1490 {
1491 	char *smallerthan;
1492 
1493 	smallerthan = strchr(author, '<');
1494 	if (smallerthan && smallerthan[1] != '\0')
1495 		author = smallerthan + 1;
1496 	author[strcspn(author, "@>")] = '\0';
1497 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1498 	    col_tab_align, 0);
1499 }
1500 
1501 static const struct got_error *
1502 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1503     struct got_object_id *id, const size_t date_display_cols,
1504     int author_display_cols)
1505 {
1506 	struct tog_log_view_state *s = &view->state.log;
1507 	const struct got_error *err = NULL;
1508 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1509 	char *logmsg0 = NULL, *logmsg = NULL;
1510 	char *author = NULL;
1511 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1512 	int author_width, logmsg_width;
1513 	char *newline, *line = NULL;
1514 	int col, limit, scrollx;
1515 	const int avail = view->ncols;
1516 	struct tm tm;
1517 	time_t committer_time;
1518 	struct tog_color *tc;
1519 
1520 	committer_time = got_object_commit_get_committer_time(commit);
1521 	if (gmtime_r(&committer_time, &tm) == NULL)
1522 		return got_error_from_errno("gmtime_r");
1523 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1524 		return got_error(GOT_ERR_NO_SPACE);
1525 
1526 	if (avail <= date_display_cols)
1527 		limit = MIN(sizeof(datebuf) - 1, avail);
1528 	else
1529 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1530 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1531 	if (tc)
1532 		wattr_on(view->window,
1533 		    COLOR_PAIR(tc->colorpair), NULL);
1534 	waddnstr(view->window, datebuf, limit);
1535 	if (tc)
1536 		wattr_off(view->window,
1537 		    COLOR_PAIR(tc->colorpair), NULL);
1538 	col = limit;
1539 	if (col > avail)
1540 		goto done;
1541 
1542 	if (avail >= 120) {
1543 		char *id_str;
1544 		err = got_object_id_str(&id_str, id);
1545 		if (err)
1546 			goto done;
1547 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1548 		if (tc)
1549 			wattr_on(view->window,
1550 			    COLOR_PAIR(tc->colorpair), NULL);
1551 		wprintw(view->window, "%.8s ", id_str);
1552 		if (tc)
1553 			wattr_off(view->window,
1554 			    COLOR_PAIR(tc->colorpair), NULL);
1555 		free(id_str);
1556 		col += 9;
1557 		if (col > avail)
1558 			goto done;
1559 	}
1560 
1561 	author = strdup(got_object_commit_get_author(commit));
1562 	if (author == NULL) {
1563 		err = got_error_from_errno("strdup");
1564 		goto done;
1565 	}
1566 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1567 	if (err)
1568 		goto done;
1569 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1570 	if (tc)
1571 		wattr_on(view->window,
1572 		    COLOR_PAIR(tc->colorpair), NULL);
1573 	waddwstr(view->window, wauthor);
1574 	if (tc)
1575 		wattr_off(view->window,
1576 		    COLOR_PAIR(tc->colorpair), NULL);
1577 	col += author_width;
1578 	while (col < avail && author_width < author_display_cols + 2) {
1579 		waddch(view->window, ' ');
1580 		col++;
1581 		author_width++;
1582 	}
1583 	if (col > avail)
1584 		goto done;
1585 
1586 	err = got_object_commit_get_logmsg(&logmsg0, commit);
1587 	if (err)
1588 		goto done;
1589 	logmsg = logmsg0;
1590 	while (*logmsg == '\n')
1591 		logmsg++;
1592 	newline = strchr(logmsg, '\n');
1593 	if (newline)
1594 		*newline = '\0';
1595 	limit = avail - col;
1596 	if (view->child && view_is_splitscreen(view->child) && limit > 0)
1597 		limit--;	/* for the border */
1598 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
1599 	    limit, col, 1);
1600 	if (err)
1601 		goto done;
1602 	waddwstr(view->window, &wlogmsg[scrollx]);
1603 	col += MAX(logmsg_width, 0);
1604 	while (col < avail) {
1605 		waddch(view->window, ' ');
1606 		col++;
1607 	}
1608 done:
1609 	free(logmsg0);
1610 	free(wlogmsg);
1611 	free(author);
1612 	free(wauthor);
1613 	free(line);
1614 	return err;
1615 }
1616 
1617 static struct commit_queue_entry *
1618 alloc_commit_queue_entry(struct got_commit_object *commit,
1619     struct got_object_id *id)
1620 {
1621 	struct commit_queue_entry *entry;
1622 
1623 	entry = calloc(1, sizeof(*entry));
1624 	if (entry == NULL)
1625 		return NULL;
1626 
1627 	entry->id = id;
1628 	entry->commit = commit;
1629 	return entry;
1630 }
1631 
1632 static void
1633 pop_commit(struct commit_queue *commits)
1634 {
1635 	struct commit_queue_entry *entry;
1636 
1637 	entry = TAILQ_FIRST(&commits->head);
1638 	TAILQ_REMOVE(&commits->head, entry, entry);
1639 	got_object_commit_close(entry->commit);
1640 	commits->ncommits--;
1641 	/* Don't free entry->id! It is owned by the commit graph. */
1642 	free(entry);
1643 }
1644 
1645 static void
1646 free_commits(struct commit_queue *commits)
1647 {
1648 	while (!TAILQ_EMPTY(&commits->head))
1649 		pop_commit(commits);
1650 }
1651 
1652 static const struct got_error *
1653 match_commit(int *have_match, struct got_object_id *id,
1654     struct got_commit_object *commit, regex_t *regex)
1655 {
1656 	const struct got_error *err = NULL;
1657 	regmatch_t regmatch;
1658 	char *id_str = NULL, *logmsg = NULL;
1659 
1660 	*have_match = 0;
1661 
1662 	err = got_object_id_str(&id_str, id);
1663 	if (err)
1664 		return err;
1665 
1666 	err = got_object_commit_get_logmsg(&logmsg, commit);
1667 	if (err)
1668 		goto done;
1669 
1670 	if (regexec(regex, got_object_commit_get_author(commit), 1,
1671 	    &regmatch, 0) == 0 ||
1672 	    regexec(regex, got_object_commit_get_committer(commit), 1,
1673 	    &regmatch, 0) == 0 ||
1674 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
1675 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
1676 		*have_match = 1;
1677 done:
1678 	free(id_str);
1679 	free(logmsg);
1680 	return err;
1681 }
1682 
1683 static const struct got_error *
1684 queue_commits(struct tog_log_thread_args *a)
1685 {
1686 	const struct got_error *err = NULL;
1687 
1688 	/*
1689 	 * We keep all commits open throughout the lifetime of the log
1690 	 * view in order to avoid having to re-fetch commits from disk
1691 	 * while updating the display.
1692 	 */
1693 	do {
1694 		struct got_object_id *id;
1695 		struct got_commit_object *commit;
1696 		struct commit_queue_entry *entry;
1697 		int errcode;
1698 
1699 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
1700 		    NULL, NULL);
1701 		if (err || id == NULL)
1702 			break;
1703 
1704 		err = got_object_open_as_commit(&commit, a->repo, id);
1705 		if (err)
1706 			break;
1707 		entry = alloc_commit_queue_entry(commit, id);
1708 		if (entry == NULL) {
1709 			err = got_error_from_errno("alloc_commit_queue_entry");
1710 			break;
1711 		}
1712 
1713 		errcode = pthread_mutex_lock(&tog_mutex);
1714 		if (errcode) {
1715 			err = got_error_set_errno(errcode,
1716 			    "pthread_mutex_lock");
1717 			break;
1718 		}
1719 
1720 		entry->idx = a->commits->ncommits;
1721 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
1722 		a->commits->ncommits++;
1723 
1724 		if (*a->searching == TOG_SEARCH_FORWARD &&
1725 		    !*a->search_next_done) {
1726 			int have_match;
1727 			err = match_commit(&have_match, id, commit, a->regex);
1728 			if (err)
1729 				break;
1730 			if (have_match)
1731 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
1732 		}
1733 
1734 		errcode = pthread_mutex_unlock(&tog_mutex);
1735 		if (errcode && err == NULL)
1736 			err = got_error_set_errno(errcode,
1737 			    "pthread_mutex_unlock");
1738 		if (err)
1739 			break;
1740 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
1741 
1742 	return err;
1743 }
1744 
1745 static void
1746 select_commit(struct tog_log_view_state *s)
1747 {
1748 	struct commit_queue_entry *entry;
1749 	int ncommits = 0;
1750 
1751 	entry = s->first_displayed_entry;
1752 	while (entry) {
1753 		if (ncommits == s->selected) {
1754 			s->selected_entry = entry;
1755 			break;
1756 		}
1757 		entry = TAILQ_NEXT(entry, entry);
1758 		ncommits++;
1759 	}
1760 }
1761 
1762 static const struct got_error *
1763 draw_commits(struct tog_view *view)
1764 {
1765 	const struct got_error *err = NULL;
1766 	struct tog_log_view_state *s = &view->state.log;
1767 	struct commit_queue_entry *entry = s->selected_entry;
1768 	const int limit = view->nlines;
1769 	int width;
1770 	int ncommits, author_cols = 4;
1771 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1772 	char *refs_str = NULL;
1773 	wchar_t *wline;
1774 	struct tog_color *tc;
1775 	static const size_t date_display_cols = 12;
1776 
1777 	if (s->selected_entry &&
1778 	    !(view->searching && view->search_next_done == 0)) {
1779 		struct got_reflist_head *refs;
1780 		err = got_object_id_str(&id_str, s->selected_entry->id);
1781 		if (err)
1782 			return err;
1783 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
1784 		    s->selected_entry->id);
1785 		if (refs) {
1786 			err = build_refs_str(&refs_str, refs,
1787 			    s->selected_entry->id, s->repo);
1788 			if (err)
1789 				goto done;
1790 		}
1791 	}
1792 
1793 	if (s->thread_args.commits_needed == 0)
1794 		halfdelay(10); /* disable fast refresh */
1795 
1796 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
1797 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1798 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1799 		    (view->searching && !view->search_next_done) ?
1800 		    "searching..." : "loading...") == -1) {
1801 			err = got_error_from_errno("asprintf");
1802 			goto done;
1803 		}
1804 	} else {
1805 		const char *search_str = NULL;
1806 
1807 		if (view->searching) {
1808 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
1809 				search_str = "no more matches";
1810 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
1811 				search_str = "no matches found";
1812 			else if (!view->search_next_done)
1813 				search_str = "searching...";
1814 		}
1815 
1816 		if (asprintf(&ncommits_str, " [%d/%d] %s",
1817 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
1818 		    search_str ? search_str :
1819 		    (refs_str ? refs_str : "")) == -1) {
1820 			err = got_error_from_errno("asprintf");
1821 			goto done;
1822 		}
1823 	}
1824 
1825 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
1826 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
1827 		    "........................................",
1828 		    s->in_repo_path, ncommits_str) == -1) {
1829 			err = got_error_from_errno("asprintf");
1830 			header = NULL;
1831 			goto done;
1832 		}
1833 	} else if (asprintf(&header, "commit %s%s",
1834 	    id_str ? id_str : "........................................",
1835 	    ncommits_str) == -1) {
1836 		err = got_error_from_errno("asprintf");
1837 		header = NULL;
1838 		goto done;
1839 	}
1840 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
1841 	if (err)
1842 		goto done;
1843 
1844 	werase(view->window);
1845 
1846 	if (view_needs_focus_indication(view))
1847 		wstandout(view->window);
1848 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1849 	if (tc)
1850 		wattr_on(view->window,
1851 		    COLOR_PAIR(tc->colorpair), NULL);
1852 	waddwstr(view->window, wline);
1853 	if (tc)
1854 		wattr_off(view->window,
1855 		    COLOR_PAIR(tc->colorpair), NULL);
1856 	while (width < view->ncols) {
1857 		waddch(view->window, ' ');
1858 		width++;
1859 	}
1860 	if (view_needs_focus_indication(view))
1861 		wstandend(view->window);
1862 	free(wline);
1863 	if (limit <= 1)
1864 		goto done;
1865 
1866 	/* Grow author column size if necessary, and set view->maxx. */
1867 	entry = s->first_displayed_entry;
1868 	ncommits = 0;
1869 	view->maxx = 0;
1870 	while (entry) {
1871 		char *author, *eol, *msg, *msg0;
1872 		wchar_t *wauthor, *wmsg;
1873 		int width;
1874 		if (ncommits >= limit - 1)
1875 			break;
1876 		author = strdup(got_object_commit_get_author(entry->commit));
1877 		if (author == NULL) {
1878 			err = got_error_from_errno("strdup");
1879 			goto done;
1880 		}
1881 		err = format_author(&wauthor, &width, author, COLS,
1882 		    date_display_cols);
1883 		if (author_cols < width)
1884 			author_cols = width;
1885 		free(wauthor);
1886 		free(author);
1887 		err = got_object_commit_get_logmsg(&msg0, entry->commit);
1888 		if (err)
1889 			goto done;
1890 		msg = msg0;
1891 		while (*msg == '\n')
1892 			++msg;
1893 		if ((eol = strchr(msg, '\n')))
1894 			*eol = '\0';
1895 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
1896 		    date_display_cols + author_cols, 0);
1897 		if (err)
1898 			goto done;
1899 		view->maxx = MAX(view->maxx, width);
1900 		free(msg0);
1901 		free(wmsg);
1902 		ncommits++;
1903 		entry = TAILQ_NEXT(entry, entry);
1904 	}
1905 
1906 	entry = s->first_displayed_entry;
1907 	s->last_displayed_entry = s->first_displayed_entry;
1908 	ncommits = 0;
1909 	while (entry) {
1910 		if (ncommits >= limit - 1)
1911 			break;
1912 		if (ncommits == s->selected)
1913 			wstandout(view->window);
1914 		err = draw_commit(view, entry->commit, entry->id,
1915 		    date_display_cols, author_cols);
1916 		if (ncommits == s->selected)
1917 			wstandend(view->window);
1918 		if (err)
1919 			goto done;
1920 		ncommits++;
1921 		s->last_displayed_entry = entry;
1922 		entry = TAILQ_NEXT(entry, entry);
1923 	}
1924 
1925 	view_vborder(view);
1926 done:
1927 	free(id_str);
1928 	free(refs_str);
1929 	free(ncommits_str);
1930 	free(header);
1931 	return err;
1932 }
1933 
1934 static void
1935 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
1936 {
1937 	struct commit_queue_entry *entry;
1938 	int nscrolled = 0;
1939 
1940 	entry = TAILQ_FIRST(&s->commits.head);
1941 	if (s->first_displayed_entry == entry)
1942 		return;
1943 
1944 	entry = s->first_displayed_entry;
1945 	while (entry && nscrolled < maxscroll) {
1946 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1947 		if (entry) {
1948 			s->first_displayed_entry = entry;
1949 			nscrolled++;
1950 		}
1951 	}
1952 }
1953 
1954 static const struct got_error *
1955 trigger_log_thread(struct tog_view *view, int wait)
1956 {
1957 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
1958 	int errcode;
1959 
1960 	halfdelay(1); /* fast refresh while loading commits */
1961 
1962 	while (ta->commits_needed > 0 || ta->load_all) {
1963 		if (ta->log_complete)
1964 			break;
1965 
1966 		/* Wake the log thread. */
1967 		errcode = pthread_cond_signal(&ta->need_commits);
1968 		if (errcode)
1969 			return got_error_set_errno(errcode,
1970 			    "pthread_cond_signal");
1971 
1972 		/*
1973 		 * The mutex will be released while the view loop waits
1974 		 * in wgetch(), at which time the log thread will run.
1975 		 */
1976 		if (!wait)
1977 			break;
1978 
1979 		/* Display progress update in log view. */
1980 		show_log_view(view);
1981 		update_panels();
1982 		doupdate();
1983 
1984 		/* Wait right here while next commit is being loaded. */
1985 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
1986 		if (errcode)
1987 			return got_error_set_errno(errcode,
1988 			    "pthread_cond_wait");
1989 
1990 		/* Display progress update in log view. */
1991 		show_log_view(view);
1992 		update_panels();
1993 		doupdate();
1994 	}
1995 
1996 	return NULL;
1997 }
1998 
1999 static const struct got_error *
2000 log_scroll_down(struct tog_view *view, int maxscroll)
2001 {
2002 	struct tog_log_view_state *s = &view->state.log;
2003 	const struct got_error *err = NULL;
2004 	struct commit_queue_entry *pentry;
2005 	int nscrolled = 0, ncommits_needed;
2006 
2007 	if (s->last_displayed_entry == NULL)
2008 		return NULL;
2009 
2010 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2011 	if (s->commits.ncommits < ncommits_needed &&
2012 	    !s->thread_args.log_complete) {
2013 		/*
2014 		 * Ask the log thread for required amount of commits.
2015 		 */
2016 		s->thread_args.commits_needed += maxscroll;
2017 		err = trigger_log_thread(view, 1);
2018 		if (err)
2019 			return err;
2020 	}
2021 
2022 	do {
2023 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2024 		if (pentry == NULL)
2025 			break;
2026 
2027 		s->last_displayed_entry = pentry;
2028 
2029 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2030 		if (pentry == NULL)
2031 			break;
2032 		s->first_displayed_entry = pentry;
2033 	} while (++nscrolled < maxscroll);
2034 
2035 	return err;
2036 }
2037 
2038 static const struct got_error *
2039 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
2040     struct got_commit_object *commit, struct got_object_id *commit_id,
2041     struct tog_view *log_view, struct got_repository *repo)
2042 {
2043 	const struct got_error *err;
2044 	struct got_object_qid *parent_id;
2045 	struct tog_view *diff_view;
2046 
2047 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
2048 	if (diff_view == NULL)
2049 		return got_error_from_errno("view_open");
2050 
2051 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2052 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2053 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2054 	if (err == NULL)
2055 		*new_view = diff_view;
2056 	return err;
2057 }
2058 
2059 static const struct got_error *
2060 tree_view_visit_subtree(struct tog_tree_view_state *s,
2061     struct got_tree_object *subtree)
2062 {
2063 	struct tog_parent_tree *parent;
2064 
2065 	parent = calloc(1, sizeof(*parent));
2066 	if (parent == NULL)
2067 		return got_error_from_errno("calloc");
2068 
2069 	parent->tree = s->tree;
2070 	parent->first_displayed_entry = s->first_displayed_entry;
2071 	parent->selected_entry = s->selected_entry;
2072 	parent->selected = s->selected;
2073 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2074 	s->tree = subtree;
2075 	s->selected = 0;
2076 	s->first_displayed_entry = NULL;
2077 	return NULL;
2078 }
2079 
2080 static const struct got_error *
2081 tree_view_walk_path(struct tog_tree_view_state *s,
2082     struct got_commit_object *commit, const char *path)
2083 {
2084 	const struct got_error *err = NULL;
2085 	struct got_tree_object *tree = NULL;
2086 	const char *p;
2087 	char *slash, *subpath = NULL;
2088 
2089 	/* Walk the path and open corresponding tree objects. */
2090 	p = path;
2091 	while (*p) {
2092 		struct got_tree_entry *te;
2093 		struct got_object_id *tree_id;
2094 		char *te_name;
2095 
2096 		while (p[0] == '/')
2097 			p++;
2098 
2099 		/* Ensure the correct subtree entry is selected. */
2100 		slash = strchr(p, '/');
2101 		if (slash == NULL)
2102 			te_name = strdup(p);
2103 		else
2104 			te_name = strndup(p, slash - p);
2105 		if (te_name == NULL) {
2106 			err = got_error_from_errno("strndup");
2107 			break;
2108 		}
2109 		te = got_object_tree_find_entry(s->tree, te_name);
2110 		if (te == NULL) {
2111 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2112 			free(te_name);
2113 			break;
2114 		}
2115 		free(te_name);
2116 		s->first_displayed_entry = s->selected_entry = te;
2117 
2118 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2119 			break; /* jump to this file's entry */
2120 
2121 		slash = strchr(p, '/');
2122 		if (slash)
2123 			subpath = strndup(path, slash - path);
2124 		else
2125 			subpath = strdup(path);
2126 		if (subpath == NULL) {
2127 			err = got_error_from_errno("strdup");
2128 			break;
2129 		}
2130 
2131 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2132 		    subpath);
2133 		if (err)
2134 			break;
2135 
2136 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2137 		free(tree_id);
2138 		if (err)
2139 			break;
2140 
2141 		err = tree_view_visit_subtree(s, tree);
2142 		if (err) {
2143 			got_object_tree_close(tree);
2144 			break;
2145 		}
2146 		if (slash == NULL)
2147 			break;
2148 		free(subpath);
2149 		subpath = NULL;
2150 		p = slash;
2151 	}
2152 
2153 	free(subpath);
2154 	return err;
2155 }
2156 
2157 static const struct got_error *
2158 browse_commit_tree(struct tog_view **new_view, int begin_x,
2159     struct commit_queue_entry *entry, const char *path,
2160     const char *head_ref_name, struct got_repository *repo)
2161 {
2162 	const struct got_error *err = NULL;
2163 	struct tog_tree_view_state *s;
2164 	struct tog_view *tree_view;
2165 
2166 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
2167 	if (tree_view == NULL)
2168 		return got_error_from_errno("view_open");
2169 
2170 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2171 	if (err)
2172 		return err;
2173 	s = &tree_view->state.tree;
2174 
2175 	*new_view = tree_view;
2176 
2177 	if (got_path_is_root_dir(path))
2178 		return NULL;
2179 
2180 	return tree_view_walk_path(s, entry->commit, path);
2181 }
2182 
2183 static const struct got_error *
2184 block_signals_used_by_main_thread(void)
2185 {
2186 	sigset_t sigset;
2187 	int errcode;
2188 
2189 	if (sigemptyset(&sigset) == -1)
2190 		return got_error_from_errno("sigemptyset");
2191 
2192 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2193 	if (sigaddset(&sigset, SIGWINCH) == -1)
2194 		return got_error_from_errno("sigaddset");
2195 	if (sigaddset(&sigset, SIGCONT) == -1)
2196 		return got_error_from_errno("sigaddset");
2197 	if (sigaddset(&sigset, SIGINT) == -1)
2198 		return got_error_from_errno("sigaddset");
2199 	if (sigaddset(&sigset, SIGTERM) == -1)
2200 		return got_error_from_errno("sigaddset");
2201 
2202 	/* ncurses handles SIGTSTP */
2203 	if (sigaddset(&sigset, SIGTSTP) == -1)
2204 		return got_error_from_errno("sigaddset");
2205 
2206 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2207 	if (errcode)
2208 		return got_error_set_errno(errcode, "pthread_sigmask");
2209 
2210 	return NULL;
2211 }
2212 
2213 static void *
2214 log_thread(void *arg)
2215 {
2216 	const struct got_error *err = NULL;
2217 	int errcode = 0;
2218 	struct tog_log_thread_args *a = arg;
2219 	int done = 0;
2220 
2221 	err = block_signals_used_by_main_thread();
2222 	if (err)
2223 		return (void *)err;
2224 
2225 	while (!done && !err && !tog_fatal_signal_received()) {
2226 		err = queue_commits(a);
2227 		if (err) {
2228 			if (err->code != GOT_ERR_ITER_COMPLETED)
2229 				return (void *)err;
2230 			err = NULL;
2231 			done = 1;
2232 		} else if (a->commits_needed > 0 && !a->load_all)
2233 			a->commits_needed--;
2234 
2235 		errcode = pthread_mutex_lock(&tog_mutex);
2236 		if (errcode) {
2237 			err = got_error_set_errno(errcode,
2238 			    "pthread_mutex_lock");
2239 			break;
2240 		} else if (*a->quit)
2241 			done = 1;
2242 		else if (*a->first_displayed_entry == NULL) {
2243 			*a->first_displayed_entry =
2244 			    TAILQ_FIRST(&a->commits->head);
2245 			*a->selected_entry = *a->first_displayed_entry;
2246 		}
2247 
2248 		errcode = pthread_cond_signal(&a->commit_loaded);
2249 		if (errcode) {
2250 			err = got_error_set_errno(errcode,
2251 			    "pthread_cond_signal");
2252 			pthread_mutex_unlock(&tog_mutex);
2253 			break;
2254 		}
2255 
2256 		if (done)
2257 			a->commits_needed = 0;
2258 		else {
2259 			if (a->commits_needed == 0 && !a->load_all) {
2260 				errcode = pthread_cond_wait(&a->need_commits,
2261 				    &tog_mutex);
2262 				if (errcode)
2263 					err = got_error_set_errno(errcode,
2264 					    "pthread_cond_wait");
2265 				if (*a->quit)
2266 					done = 1;
2267 			}
2268 		}
2269 
2270 		errcode = pthread_mutex_unlock(&tog_mutex);
2271 		if (errcode && err == NULL)
2272 			err = got_error_set_errno(errcode,
2273 			    "pthread_mutex_unlock");
2274 	}
2275 	a->log_complete = 1;
2276 	return (void *)err;
2277 }
2278 
2279 static const struct got_error *
2280 stop_log_thread(struct tog_log_view_state *s)
2281 {
2282 	const struct got_error *err = NULL;
2283 	int errcode;
2284 
2285 	if (s->thread) {
2286 		s->quit = 1;
2287 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2288 		if (errcode)
2289 			return got_error_set_errno(errcode,
2290 			    "pthread_cond_signal");
2291 		errcode = pthread_mutex_unlock(&tog_mutex);
2292 		if (errcode)
2293 			return got_error_set_errno(errcode,
2294 			    "pthread_mutex_unlock");
2295 		errcode = pthread_join(s->thread, (void **)&err);
2296 		if (errcode)
2297 			return got_error_set_errno(errcode, "pthread_join");
2298 		errcode = pthread_mutex_lock(&tog_mutex);
2299 		if (errcode)
2300 			return got_error_set_errno(errcode,
2301 			    "pthread_mutex_lock");
2302 		s->thread = NULL;
2303 	}
2304 
2305 	if (s->thread_args.repo) {
2306 		err = got_repo_close(s->thread_args.repo);
2307 		s->thread_args.repo = NULL;
2308 	}
2309 
2310 	if (s->thread_args.pack_fds) {
2311 		const struct got_error *pack_err =
2312 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2313 		if (err == NULL)
2314 			err = pack_err;
2315 		s->thread_args.pack_fds = NULL;
2316 	}
2317 
2318 	if (s->thread_args.graph) {
2319 		got_commit_graph_close(s->thread_args.graph);
2320 		s->thread_args.graph = NULL;
2321 	}
2322 
2323 	return err;
2324 }
2325 
2326 static const struct got_error *
2327 close_log_view(struct tog_view *view)
2328 {
2329 	const struct got_error *err = NULL;
2330 	struct tog_log_view_state *s = &view->state.log;
2331 	int errcode;
2332 
2333 	err = stop_log_thread(s);
2334 
2335 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2336 	if (errcode && err == NULL)
2337 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2338 
2339 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2340 	if (errcode && err == NULL)
2341 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2342 
2343 	free_commits(&s->commits);
2344 	free(s->in_repo_path);
2345 	s->in_repo_path = NULL;
2346 	free(s->start_id);
2347 	s->start_id = NULL;
2348 	free(s->head_ref_name);
2349 	s->head_ref_name = NULL;
2350 	return err;
2351 }
2352 
2353 static const struct got_error *
2354 search_start_log_view(struct tog_view *view)
2355 {
2356 	struct tog_log_view_state *s = &view->state.log;
2357 
2358 	s->matched_entry = NULL;
2359 	s->search_entry = NULL;
2360 	return NULL;
2361 }
2362 
2363 static const struct got_error *
2364 search_next_log_view(struct tog_view *view)
2365 {
2366 	const struct got_error *err = NULL;
2367 	struct tog_log_view_state *s = &view->state.log;
2368 	struct commit_queue_entry *entry;
2369 
2370 	/* Display progress update in log view. */
2371 	show_log_view(view);
2372 	update_panels();
2373 	doupdate();
2374 
2375 	if (s->search_entry) {
2376 		int errcode, ch;
2377 		errcode = pthread_mutex_unlock(&tog_mutex);
2378 		if (errcode)
2379 			return got_error_set_errno(errcode,
2380 			    "pthread_mutex_unlock");
2381 		ch = wgetch(view->window);
2382 		errcode = pthread_mutex_lock(&tog_mutex);
2383 		if (errcode)
2384 			return got_error_set_errno(errcode,
2385 			    "pthread_mutex_lock");
2386 		if (ch == KEY_BACKSPACE) {
2387 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2388 			return NULL;
2389 		}
2390 		if (view->searching == TOG_SEARCH_FORWARD)
2391 			entry = TAILQ_NEXT(s->search_entry, entry);
2392 		else
2393 			entry = TAILQ_PREV(s->search_entry,
2394 			    commit_queue_head, entry);
2395 	} else if (s->matched_entry) {
2396 		int matched_idx = s->matched_entry->idx;
2397 		int selected_idx = s->selected_entry->idx;
2398 
2399 		/*
2400 		 * If the user has moved the cursor after we hit a match,
2401 		 * the position from where we should continue searching
2402 		 * might have changed.
2403 		 */
2404 		if (view->searching == TOG_SEARCH_FORWARD) {
2405 			if (matched_idx > selected_idx)
2406 				entry = TAILQ_NEXT(s->selected_entry, entry);
2407 			else
2408 				entry = TAILQ_NEXT(s->matched_entry, entry);
2409 		} else {
2410 			if (matched_idx < selected_idx)
2411 				entry = TAILQ_PREV(s->selected_entry,
2412 						commit_queue_head, entry);
2413 			else
2414 				entry = TAILQ_PREV(s->matched_entry,
2415 						commit_queue_head, entry);
2416 		}
2417 	} else {
2418 		entry = s->selected_entry;
2419 	}
2420 
2421 	while (1) {
2422 		int have_match = 0;
2423 
2424 		if (entry == NULL) {
2425 			if (s->thread_args.log_complete ||
2426 			    view->searching == TOG_SEARCH_BACKWARD) {
2427 				view->search_next_done =
2428 				    (s->matched_entry == NULL ?
2429 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2430 				s->search_entry = NULL;
2431 				return NULL;
2432 			}
2433 			/*
2434 			 * Poke the log thread for more commits and return,
2435 			 * allowing the main loop to make progress. Search
2436 			 * will resume at s->search_entry once we come back.
2437 			 */
2438 			s->thread_args.commits_needed++;
2439 			return trigger_log_thread(view, 0);
2440 		}
2441 
2442 		err = match_commit(&have_match, entry->id, entry->commit,
2443 		    &view->regex);
2444 		if (err)
2445 			break;
2446 		if (have_match) {
2447 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2448 			s->matched_entry = entry;
2449 			break;
2450 		}
2451 
2452 		s->search_entry = entry;
2453 		if (view->searching == TOG_SEARCH_FORWARD)
2454 			entry = TAILQ_NEXT(entry, entry);
2455 		else
2456 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2457 	}
2458 
2459 	if (s->matched_entry) {
2460 		int cur = s->selected_entry->idx;
2461 		while (cur < s->matched_entry->idx) {
2462 			err = input_log_view(NULL, view, KEY_DOWN);
2463 			if (err)
2464 				return err;
2465 			cur++;
2466 		}
2467 		while (cur > s->matched_entry->idx) {
2468 			err = input_log_view(NULL, view, KEY_UP);
2469 			if (err)
2470 				return err;
2471 			cur--;
2472 		}
2473 	}
2474 
2475 	s->search_entry = NULL;
2476 
2477 	return NULL;
2478 }
2479 
2480 static const struct got_error *
2481 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2482     struct got_repository *repo, const char *head_ref_name,
2483     const char *in_repo_path, int log_branches)
2484 {
2485 	const struct got_error *err = NULL;
2486 	struct tog_log_view_state *s = &view->state.log;
2487 	struct got_repository *thread_repo = NULL;
2488 	struct got_commit_graph *thread_graph = NULL;
2489 	int errcode;
2490 
2491 	if (in_repo_path != s->in_repo_path) {
2492 		free(s->in_repo_path);
2493 		s->in_repo_path = strdup(in_repo_path);
2494 		if (s->in_repo_path == NULL)
2495 			return got_error_from_errno("strdup");
2496 	}
2497 
2498 	/* The commit queue only contains commits being displayed. */
2499 	TAILQ_INIT(&s->commits.head);
2500 	s->commits.ncommits = 0;
2501 
2502 	s->repo = repo;
2503 	if (head_ref_name) {
2504 		s->head_ref_name = strdup(head_ref_name);
2505 		if (s->head_ref_name == NULL) {
2506 			err = got_error_from_errno("strdup");
2507 			goto done;
2508 		}
2509 	}
2510 	s->start_id = got_object_id_dup(start_id);
2511 	if (s->start_id == NULL) {
2512 		err = got_error_from_errno("got_object_id_dup");
2513 		goto done;
2514 	}
2515 	s->log_branches = log_branches;
2516 
2517 	STAILQ_INIT(&s->colors);
2518 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2519 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2520 		    get_color_value("TOG_COLOR_COMMIT"));
2521 		if (err)
2522 			goto done;
2523 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2524 		    get_color_value("TOG_COLOR_AUTHOR"));
2525 		if (err) {
2526 			free_colors(&s->colors);
2527 			goto done;
2528 		}
2529 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2530 		    get_color_value("TOG_COLOR_DATE"));
2531 		if (err) {
2532 			free_colors(&s->colors);
2533 			goto done;
2534 		}
2535 	}
2536 
2537 	view->show = show_log_view;
2538 	view->input = input_log_view;
2539 	view->close = close_log_view;
2540 	view->search_start = search_start_log_view;
2541 	view->search_next = search_next_log_view;
2542 
2543 	if (s->thread_args.pack_fds == NULL) {
2544 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2545 		if (err)
2546 			goto done;
2547 	}
2548 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
2549 	    s->thread_args.pack_fds);
2550 	if (err)
2551 		goto done;
2552 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
2553 	    !s->log_branches);
2554 	if (err)
2555 		goto done;
2556 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
2557 	    s->repo, NULL, NULL);
2558 	if (err)
2559 		goto done;
2560 
2561 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
2562 	if (errcode) {
2563 		err = got_error_set_errno(errcode, "pthread_cond_init");
2564 		goto done;
2565 	}
2566 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
2567 	if (errcode) {
2568 		err = got_error_set_errno(errcode, "pthread_cond_init");
2569 		goto done;
2570 	}
2571 
2572 	s->thread_args.commits_needed = view->nlines;
2573 	s->thread_args.graph = thread_graph;
2574 	s->thread_args.commits = &s->commits;
2575 	s->thread_args.in_repo_path = s->in_repo_path;
2576 	s->thread_args.start_id = s->start_id;
2577 	s->thread_args.repo = thread_repo;
2578 	s->thread_args.log_complete = 0;
2579 	s->thread_args.quit = &s->quit;
2580 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
2581 	s->thread_args.selected_entry = &s->selected_entry;
2582 	s->thread_args.searching = &view->searching;
2583 	s->thread_args.search_next_done = &view->search_next_done;
2584 	s->thread_args.regex = &view->regex;
2585 done:
2586 	if (err)
2587 		close_log_view(view);
2588 	return err;
2589 }
2590 
2591 static const struct got_error *
2592 show_log_view(struct tog_view *view)
2593 {
2594 	const struct got_error *err;
2595 	struct tog_log_view_state *s = &view->state.log;
2596 
2597 	if (s->thread == NULL) {
2598 		int errcode = pthread_create(&s->thread, NULL, log_thread,
2599 		    &s->thread_args);
2600 		if (errcode)
2601 			return got_error_set_errno(errcode, "pthread_create");
2602 		if (s->thread_args.commits_needed > 0) {
2603 			err = trigger_log_thread(view, 1);
2604 			if (err)
2605 				return err;
2606 		}
2607 	}
2608 
2609 	return draw_commits(view);
2610 }
2611 
2612 static const struct got_error *
2613 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
2614 {
2615 	const struct got_error *err = NULL;
2616 	struct tog_log_view_state *s = &view->state.log;
2617 	struct tog_view *diff_view = NULL, *tree_view = NULL;
2618 	struct tog_view *ref_view = NULL;
2619 	struct commit_queue_entry *entry;
2620 	int begin_x = 0, n, nscroll = view->nlines - 1;
2621 
2622 	if (s->thread_args.load_all) {
2623 		if (ch == KEY_BACKSPACE)
2624 			s->thread_args.load_all = 0;
2625 		else if (s->thread_args.log_complete) {
2626 			s->thread_args.load_all = 0;
2627 			log_scroll_down(view, s->commits.ncommits);
2628 			s->selected = MIN(view->nlines - 2,
2629 			    s->commits.ncommits - 1);
2630 			select_commit(s);
2631 		}
2632 		return NULL;
2633 	}
2634 
2635 	switch (ch) {
2636 	case 'q':
2637 		s->quit = 1;
2638 		break;
2639 	case '0':
2640 		view->x = 0;
2641 		break;
2642 	case '$':
2643 		view->x = MAX(view->maxx - view->ncols / 2, 0);
2644 		view->count = 0;
2645 		break;
2646 	case KEY_RIGHT:
2647 	case 'l':
2648 		if (view->x + view->ncols / 2 < view->maxx)
2649 			view->x += 2;  /* move two columns right */
2650 		else
2651 			view->count = 0;
2652 		break;
2653 	case KEY_LEFT:
2654 	case 'h':
2655 		view->x -= MIN(view->x, 2);  /* move two columns back */
2656 		if (view->x <= 0)
2657 			view->count = 0;
2658 		break;
2659 	case 'k':
2660 	case KEY_UP:
2661 	case '<':
2662 	case ',':
2663 	case CTRL('p'):
2664 		if (s->selected_entry->idx == 0)
2665 			view->count = 0;
2666 		if (s->first_displayed_entry == NULL)
2667 			break;
2668 		if (s->selected > 0)
2669 			s->selected--;
2670 		else
2671 			log_scroll_up(s, 1);
2672 		select_commit(s);
2673 		break;
2674 	case 'g':
2675 	case KEY_HOME:
2676 		s->selected = 0;
2677 		s->first_displayed_entry = TAILQ_FIRST(&s->commits.head);
2678 		select_commit(s);
2679 		view->count = 0;
2680 		break;
2681 	case CTRL('u'):
2682 	case 'u':
2683 		nscroll /= 2;
2684 		/* FALL THROUGH */
2685 	case KEY_PPAGE:
2686 	case CTRL('b'):
2687 	case 'b':
2688 		if (s->first_displayed_entry == NULL)
2689 			break;
2690 		if (TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
2691 			s->selected = MAX(0, s->selected - nscroll - 1);
2692 		else
2693 			log_scroll_up(s, nscroll);
2694 		select_commit(s);
2695 		if (s->selected_entry->idx == 0)
2696 			view->count = 0;
2697 		break;
2698 	case 'j':
2699 	case KEY_DOWN:
2700 	case '>':
2701 	case '.':
2702 	case CTRL('n'):
2703 		if (s->first_displayed_entry == NULL)
2704 			break;
2705 		if (s->selected < MIN(view->nlines - 2,
2706 		    s->commits.ncommits - 1))
2707 			s->selected++;
2708 		else {
2709 			err = log_scroll_down(view, 1);
2710 			if (err)
2711 				break;
2712 		}
2713 		select_commit(s);
2714 		if (s->thread_args.log_complete &&
2715 		    s->selected_entry->idx == s->commits.ncommits - 1)
2716 			view->count = 0;
2717 		break;
2718 	case 'G':
2719 	case KEY_END: {
2720 		/* We don't know yet how many commits, so we're forced to
2721 		 * traverse them all. */
2722 		view->count = 0;
2723 		if (!s->thread_args.log_complete) {
2724 			s->thread_args.load_all = 1;
2725 			return trigger_log_thread(view, 0);
2726 		}
2727 
2728 		s->selected = 0;
2729 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
2730 		for (n = 0; n < view->nlines - 1; n++) {
2731 			if (entry == NULL)
2732 				break;
2733 			s->first_displayed_entry = entry;
2734 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2735 		}
2736 		if (n > 0)
2737 			s->selected = n - 1;
2738 		select_commit(s);
2739 		break;
2740 	}
2741 	case CTRL('d'):
2742 	case 'd':
2743 		nscroll /= 2;
2744 		/* FALL THROUGH */
2745 	case KEY_NPAGE:
2746 	case CTRL('f'):
2747 	case 'f':
2748 	case ' ': {
2749 		struct commit_queue_entry *first;
2750 		first = s->first_displayed_entry;
2751 		if (first == NULL) {
2752 			view->count = 0;
2753 			break;
2754 		}
2755 		err = log_scroll_down(view, nscroll);
2756 		if (err)
2757 			break;
2758 		if (first == s->first_displayed_entry &&
2759 		    s->selected < MIN(view->nlines - 2,
2760 		    s->commits.ncommits - 1)) {
2761 			/* can't scroll further down */
2762 			s->selected += MIN(s->last_displayed_entry->idx -
2763 			    s->selected_entry->idx, nscroll + 1);
2764 		}
2765 		select_commit(s);
2766 		if (s->thread_args.log_complete &&
2767 		    s->selected_entry->idx == s->commits.ncommits - 1)
2768 			view->count = 0;
2769 		break;
2770 	}
2771 	case KEY_RESIZE:
2772 		if (s->selected > view->nlines - 2)
2773 			s->selected = view->nlines - 2;
2774 		if (s->selected > s->commits.ncommits - 1)
2775 			s->selected = s->commits.ncommits - 1;
2776 		select_commit(s);
2777 		if (s->commits.ncommits < view->nlines - 1 &&
2778 		    !s->thread_args.log_complete) {
2779 			s->thread_args.commits_needed += (view->nlines - 1) -
2780 			    s->commits.ncommits;
2781 			err = trigger_log_thread(view, 1);
2782 		}
2783 		break;
2784 	case KEY_ENTER:
2785 	case '\r':
2786 		view->count = 0;
2787 		if (s->selected_entry == NULL)
2788 			break;
2789 		if (view_is_parent_view(view))
2790 			begin_x = view_split_begin_x(view->begin_x);
2791 		err = open_diff_view_for_commit(&diff_view, begin_x,
2792 		    s->selected_entry->commit, s->selected_entry->id,
2793 		    view, s->repo);
2794 		if (err)
2795 			break;
2796 		view->focussed = 0;
2797 		diff_view->focussed = 1;
2798 		if (view_is_parent_view(view)) {
2799 			err = view_close_child(view);
2800 			if (err)
2801 				return err;
2802 			err = view_set_child(view, diff_view);
2803 			if (err)
2804 				return err;
2805 			view->focus_child = 1;
2806 		} else
2807 			*new_view = diff_view;
2808 		break;
2809 	case 't':
2810 		view->count = 0;
2811 		if (s->selected_entry == NULL)
2812 			break;
2813 		if (view_is_parent_view(view))
2814 			begin_x = view_split_begin_x(view->begin_x);
2815 		err = browse_commit_tree(&tree_view, begin_x,
2816 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
2817 		    s->repo);
2818 		if (err)
2819 			break;
2820 		view->focussed = 0;
2821 		tree_view->focussed = 1;
2822 		if (view_is_parent_view(view)) {
2823 			err = view_close_child(view);
2824 			if (err)
2825 				return err;
2826 			err = view_set_child(view, tree_view);
2827 			if (err)
2828 				return err;
2829 			view->focus_child = 1;
2830 		} else
2831 			*new_view = tree_view;
2832 		break;
2833 	case KEY_BACKSPACE:
2834 	case CTRL('l'):
2835 	case 'B':
2836 		view->count = 0;
2837 		if (ch == KEY_BACKSPACE &&
2838 		    got_path_is_root_dir(s->in_repo_path))
2839 			break;
2840 		err = stop_log_thread(s);
2841 		if (err)
2842 			return err;
2843 		if (ch == KEY_BACKSPACE) {
2844 			char *parent_path;
2845 			err = got_path_dirname(&parent_path, s->in_repo_path);
2846 			if (err)
2847 				return err;
2848 			free(s->in_repo_path);
2849 			s->in_repo_path = parent_path;
2850 			s->thread_args.in_repo_path = s->in_repo_path;
2851 		} else if (ch == CTRL('l')) {
2852 			struct got_object_id *start_id;
2853 			err = got_repo_match_object_id(&start_id, NULL,
2854 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
2855 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
2856 			if (err)
2857 				return err;
2858 			free(s->start_id);
2859 			s->start_id = start_id;
2860 			s->thread_args.start_id = s->start_id;
2861 		} else /* 'B' */
2862 			s->log_branches = !s->log_branches;
2863 
2864 		if (s->thread_args.pack_fds == NULL) {
2865 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
2866 			if (err)
2867 				return err;
2868 		}
2869 		err = got_repo_open(&s->thread_args.repo,
2870 		    got_repo_get_path(s->repo), NULL,
2871 		    s->thread_args.pack_fds);
2872 		if (err)
2873 			return err;
2874 		tog_free_refs();
2875 		err = tog_load_refs(s->repo, 0);
2876 		if (err)
2877 			return err;
2878 		err = got_commit_graph_open(&s->thread_args.graph,
2879 		    s->in_repo_path, !s->log_branches);
2880 		if (err)
2881 			return err;
2882 		err = got_commit_graph_iter_start(s->thread_args.graph,
2883 		    s->start_id, s->repo, NULL, NULL);
2884 		if (err)
2885 			return err;
2886 		free_commits(&s->commits);
2887 		s->first_displayed_entry = NULL;
2888 		s->last_displayed_entry = NULL;
2889 		s->selected_entry = NULL;
2890 		s->selected = 0;
2891 		s->thread_args.log_complete = 0;
2892 		s->quit = 0;
2893 		s->thread_args.commits_needed = view->nlines;
2894 		s->matched_entry = NULL;
2895 		s->search_entry = NULL;
2896 		break;
2897 	case 'r':
2898 		view->count = 0;
2899 		if (view_is_parent_view(view))
2900 			begin_x = view_split_begin_x(view->begin_x);
2901 		ref_view = view_open(view->nlines, view->ncols,
2902 		    view->begin_y, begin_x, TOG_VIEW_REF);
2903 		if (ref_view == NULL)
2904 			return got_error_from_errno("view_open");
2905 		err = open_ref_view(ref_view, s->repo);
2906 		if (err) {
2907 			view_close(ref_view);
2908 			return err;
2909 		}
2910 		view->focussed = 0;
2911 		ref_view->focussed = 1;
2912 		if (view_is_parent_view(view)) {
2913 			err = view_close_child(view);
2914 			if (err)
2915 				return err;
2916 			err = view_set_child(view, ref_view);
2917 			if (err)
2918 				return err;
2919 			view->focus_child = 1;
2920 		} else
2921 			*new_view = ref_view;
2922 		break;
2923 	default:
2924 		view->count = 0;
2925 		break;
2926 	}
2927 
2928 	return err;
2929 }
2930 
2931 static const struct got_error *
2932 apply_unveil(const char *repo_path, const char *worktree_path)
2933 {
2934 	const struct got_error *error;
2935 
2936 #ifdef PROFILE
2937 	if (unveil("gmon.out", "rwc") != 0)
2938 		return got_error_from_errno2("unveil", "gmon.out");
2939 #endif
2940 	if (repo_path && unveil(repo_path, "r") != 0)
2941 		return got_error_from_errno2("unveil", repo_path);
2942 
2943 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
2944 		return got_error_from_errno2("unveil", worktree_path);
2945 
2946 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
2947 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
2948 
2949 	error = got_privsep_unveil_exec_helpers();
2950 	if (error != NULL)
2951 		return error;
2952 
2953 	if (unveil(NULL, NULL) != 0)
2954 		return got_error_from_errno("unveil");
2955 
2956 	return NULL;
2957 }
2958 
2959 static void
2960 init_curses(void)
2961 {
2962 	/*
2963 	 * Override default signal handlers before starting ncurses.
2964 	 * This should prevent ncurses from installing its own
2965 	 * broken cleanup() signal handler.
2966 	 */
2967 	signal(SIGWINCH, tog_sigwinch);
2968 	signal(SIGPIPE, tog_sigpipe);
2969 	signal(SIGCONT, tog_sigcont);
2970 	signal(SIGINT, tog_sigint);
2971 	signal(SIGTERM, tog_sigterm);
2972 
2973 	initscr();
2974 	cbreak();
2975 	halfdelay(1); /* Do fast refresh while initial view is loading. */
2976 	noecho();
2977 	nonl();
2978 	intrflush(stdscr, FALSE);
2979 	keypad(stdscr, TRUE);
2980 	curs_set(0);
2981 	if (getenv("TOG_COLORS") != NULL) {
2982 		start_color();
2983 		use_default_colors();
2984 	}
2985 }
2986 
2987 static const struct got_error *
2988 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
2989     struct got_repository *repo, struct got_worktree *worktree)
2990 {
2991 	const struct got_error *err = NULL;
2992 
2993 	if (argc == 0) {
2994 		*in_repo_path = strdup("/");
2995 		if (*in_repo_path == NULL)
2996 			return got_error_from_errno("strdup");
2997 		return NULL;
2998 	}
2999 
3000 	if (worktree) {
3001 		const char *prefix = got_worktree_get_path_prefix(worktree);
3002 		char *p;
3003 
3004 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3005 		if (err)
3006 			return err;
3007 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3008 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3009 		    p) == -1) {
3010 			err = got_error_from_errno("asprintf");
3011 			*in_repo_path = NULL;
3012 		}
3013 		free(p);
3014 	} else
3015 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3016 
3017 	return err;
3018 }
3019 
3020 static const struct got_error *
3021 cmd_log(int argc, char *argv[])
3022 {
3023 	const struct got_error *error;
3024 	struct got_repository *repo = NULL;
3025 	struct got_worktree *worktree = NULL;
3026 	struct got_object_id *start_id = NULL;
3027 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3028 	char *start_commit = NULL, *label = NULL;
3029 	struct got_reference *ref = NULL;
3030 	const char *head_ref_name = NULL;
3031 	int ch, log_branches = 0;
3032 	struct tog_view *view;
3033 	int *pack_fds = NULL;
3034 
3035 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3036 		switch (ch) {
3037 		case 'b':
3038 			log_branches = 1;
3039 			break;
3040 		case 'c':
3041 			start_commit = optarg;
3042 			break;
3043 		case 'r':
3044 			repo_path = realpath(optarg, NULL);
3045 			if (repo_path == NULL)
3046 				return got_error_from_errno2("realpath",
3047 				    optarg);
3048 			break;
3049 		default:
3050 			usage_log();
3051 			/* NOTREACHED */
3052 		}
3053 	}
3054 
3055 	argc -= optind;
3056 	argv += optind;
3057 
3058 	if (argc > 1)
3059 		usage_log();
3060 
3061 	error = got_repo_pack_fds_open(&pack_fds);
3062 	if (error != NULL)
3063 		goto done;
3064 
3065 	if (repo_path == NULL) {
3066 		cwd = getcwd(NULL, 0);
3067 		if (cwd == NULL)
3068 			return got_error_from_errno("getcwd");
3069 		error = got_worktree_open(&worktree, cwd);
3070 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3071 			goto done;
3072 		if (worktree)
3073 			repo_path =
3074 			    strdup(got_worktree_get_repo_path(worktree));
3075 		else
3076 			repo_path = strdup(cwd);
3077 		if (repo_path == NULL) {
3078 			error = got_error_from_errno("strdup");
3079 			goto done;
3080 		}
3081 	}
3082 
3083 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3084 	if (error != NULL)
3085 		goto done;
3086 
3087 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3088 	    repo, worktree);
3089 	if (error)
3090 		goto done;
3091 
3092 	init_curses();
3093 
3094 	error = apply_unveil(got_repo_get_path(repo),
3095 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3096 	if (error)
3097 		goto done;
3098 
3099 	/* already loaded by tog_log_with_path()? */
3100 	if (TAILQ_EMPTY(&tog_refs)) {
3101 		error = tog_load_refs(repo, 0);
3102 		if (error)
3103 			goto done;
3104 	}
3105 
3106 	if (start_commit == NULL) {
3107 		error = got_repo_match_object_id(&start_id, &label,
3108 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3109 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3110 		if (error)
3111 			goto done;
3112 		head_ref_name = label;
3113 	} else {
3114 		error = got_ref_open(&ref, repo, start_commit, 0);
3115 		if (error == NULL)
3116 			head_ref_name = got_ref_get_name(ref);
3117 		else if (error->code != GOT_ERR_NOT_REF)
3118 			goto done;
3119 		error = got_repo_match_object_id(&start_id, NULL,
3120 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3121 		if (error)
3122 			goto done;
3123 	}
3124 
3125 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3126 	if (view == NULL) {
3127 		error = got_error_from_errno("view_open");
3128 		goto done;
3129 	}
3130 	error = open_log_view(view, start_id, repo, head_ref_name,
3131 	    in_repo_path, log_branches);
3132 	if (error)
3133 		goto done;
3134 	if (worktree) {
3135 		/* Release work tree lock. */
3136 		got_worktree_close(worktree);
3137 		worktree = NULL;
3138 	}
3139 	error = view_loop(view);
3140 done:
3141 	free(in_repo_path);
3142 	free(repo_path);
3143 	free(cwd);
3144 	free(start_id);
3145 	free(label);
3146 	if (ref)
3147 		got_ref_close(ref);
3148 	if (repo) {
3149 		const struct got_error *close_err = got_repo_close(repo);
3150 		if (error == NULL)
3151 			error = close_err;
3152 	}
3153 	if (worktree)
3154 		got_worktree_close(worktree);
3155 	if (pack_fds) {
3156 		const struct got_error *pack_err =
3157 		    got_repo_pack_fds_close(pack_fds);
3158 		if (error == NULL)
3159 			error = pack_err;
3160 	}
3161 	tog_free_refs();
3162 	return error;
3163 }
3164 
3165 __dead static void
3166 usage_diff(void)
3167 {
3168 	endwin();
3169 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3170 	    "[-w] object1 object2\n", getprogname());
3171 	exit(1);
3172 }
3173 
3174 static int
3175 match_line(const char *line, regex_t *regex, size_t nmatch,
3176     regmatch_t *regmatch)
3177 {
3178 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3179 }
3180 
3181 struct tog_color *
3182 match_color(struct tog_colors *colors, const char *line)
3183 {
3184 	struct tog_color *tc = NULL;
3185 
3186 	STAILQ_FOREACH(tc, colors, entry) {
3187 		if (match_line(line, &tc->regex, 0, NULL))
3188 			return tc;
3189 	}
3190 
3191 	return NULL;
3192 }
3193 
3194 static const struct got_error *
3195 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3196     WINDOW *window, int skipcol, regmatch_t *regmatch)
3197 {
3198 	const struct got_error *err = NULL;
3199 	char *exstr = NULL;
3200 	wchar_t *wline = NULL;
3201 	int rme, rms, n, width, scrollx;
3202 	int width0 = 0, width1 = 0, width2 = 0;
3203 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3204 
3205 	*wtotal = 0;
3206 
3207 	rms = regmatch->rm_so;
3208 	rme = regmatch->rm_eo;
3209 
3210 	err = expand_tab(&exstr, line);
3211 	if (err)
3212 		return err;
3213 
3214 	/* Split the line into 3 segments, according to match offsets. */
3215 	seg0 = strndup(exstr, rms);
3216 	if (seg0 == NULL) {
3217 		err = got_error_from_errno("strndup");
3218 		goto done;
3219 	}
3220 	seg1 = strndup(exstr + rms, rme - rms);
3221 	if (seg1 == NULL) {
3222 		err = got_error_from_errno("strndup");
3223 		goto done;
3224 	}
3225 	seg2 = strdup(exstr + rme);
3226 	if (seg2 == NULL) {
3227 		err = got_error_from_errno("strndup");
3228 		goto done;
3229 	}
3230 
3231 	/* draw up to matched token if we haven't scrolled past it */
3232 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3233 	    col_tab_align, 1);
3234 	if (err)
3235 		goto done;
3236 	n = MAX(width0 - skipcol, 0);
3237 	if (n) {
3238 		free(wline);
3239 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3240 		    wlimit, col_tab_align, 1);
3241 		if (err)
3242 			goto done;
3243 		waddwstr(window, &wline[scrollx]);
3244 		wlimit -= width;
3245 		*wtotal += width;
3246 	}
3247 
3248 	if (wlimit > 0) {
3249 		int i = 0, w = 0;
3250 		size_t wlen;
3251 
3252 		free(wline);
3253 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3254 		    col_tab_align, 1);
3255 		if (err)
3256 			goto done;
3257 		wlen = wcslen(wline);
3258 		while (i < wlen) {
3259 			width = wcwidth(wline[i]);
3260 			if (width == -1) {
3261 				/* should not happen, tabs are expanded */
3262 				err = got_error(GOT_ERR_RANGE);
3263 				goto done;
3264 			}
3265 			if (width0 + w + width > skipcol)
3266 				break;
3267 			w += width;
3268 			i++;
3269 		}
3270 		/* draw (visible part of) matched token (if scrolled into it) */
3271 		if (width1 - w > 0) {
3272 			wattron(window, A_STANDOUT);
3273 			waddwstr(window, &wline[i]);
3274 			wattroff(window, A_STANDOUT);
3275 			wlimit -= (width1 - w);
3276 			*wtotal += (width1 - w);
3277 		}
3278 	}
3279 
3280 	if (wlimit > 0) {  /* draw rest of line */
3281 		free(wline);
3282 		if (skipcol > width0 + width1) {
3283 			err = format_line(&wline, &width2, &scrollx, seg2,
3284 			    skipcol - (width0 + width1), wlimit,
3285 			    col_tab_align, 1);
3286 			if (err)
3287 				goto done;
3288 			waddwstr(window, &wline[scrollx]);
3289 		} else {
3290 			err = format_line(&wline, &width2, NULL, seg2, 0,
3291 			    wlimit, col_tab_align, 1);
3292 			if (err)
3293 				goto done;
3294 			waddwstr(window, wline);
3295 		}
3296 		*wtotal += width2;
3297 	}
3298 done:
3299 	free(wline);
3300 	free(exstr);
3301 	free(seg0);
3302 	free(seg1);
3303 	free(seg2);
3304 	return err;
3305 }
3306 
3307 static const struct got_error *
3308 draw_file(struct tog_view *view, const char *header)
3309 {
3310 	struct tog_diff_view_state *s = &view->state.diff;
3311 	regmatch_t *regmatch = &view->regmatch;
3312 	const struct got_error *err;
3313 	int nprinted = 0;
3314 	char *line;
3315 	size_t linesize = 0;
3316 	ssize_t linelen;
3317 	struct tog_color *tc;
3318 	wchar_t *wline;
3319 	int width;
3320 	int max_lines = view->nlines;
3321 	int nlines = s->nlines;
3322 	off_t line_offset;
3323 
3324 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3325 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3326 		return got_error_from_errno("fseek");
3327 
3328 	werase(view->window);
3329 
3330 	if (header) {
3331 		if (asprintf(&line, "[%d/%d] %s",
3332 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3333 		    header) == -1)
3334 			return got_error_from_errno("asprintf");
3335 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3336 		    0, 0);
3337 		free(line);
3338 		if (err)
3339 			return err;
3340 
3341 		if (view_needs_focus_indication(view))
3342 			wstandout(view->window);
3343 		waddwstr(view->window, wline);
3344 		free(wline);
3345 		wline = NULL;
3346 		if (view_needs_focus_indication(view))
3347 			wstandend(view->window);
3348 		if (width <= view->ncols - 1)
3349 			waddch(view->window, '\n');
3350 
3351 		if (max_lines <= 1)
3352 			return NULL;
3353 		max_lines--;
3354 	}
3355 
3356 	s->eof = 0;
3357 	view->maxx = 0;
3358 	line = NULL;
3359 	while (max_lines > 0 && nprinted < max_lines) {
3360 		linelen = getline(&line, &linesize, s->f);
3361 		if (linelen == -1) {
3362 			if (feof(s->f)) {
3363 				s->eof = 1;
3364 				break;
3365 			}
3366 			free(line);
3367 			return got_ferror(s->f, GOT_ERR_IO);
3368 		}
3369 
3370 		/* Set view->maxx based on full line length. */
3371 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3372 		    view->x ? 1 : 0);
3373 		if (err) {
3374 			free(line);
3375 			return err;
3376 		}
3377 		view->maxx = MAX(view->maxx, width);
3378 		free(wline);
3379 		wline = NULL;
3380 
3381 		tc = match_color(&s->colors, line);
3382 		if (tc)
3383 			wattr_on(view->window,
3384 			    COLOR_PAIR(tc->colorpair), NULL);
3385 		if (s->first_displayed_line + nprinted == s->matched_line &&
3386 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3387 			err = add_matched_line(&width, line, view->ncols, 0,
3388 			    view->window, view->x, regmatch);
3389 			if (err) {
3390 				free(line);
3391 				return err;
3392 			}
3393 		} else {
3394 			int skip;
3395 			err = format_line(&wline, &width, &skip, line,
3396 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3397 			if (err) {
3398 				free(line);
3399 				return err;
3400 			}
3401 			waddwstr(view->window, &wline[skip]);
3402 			free(wline);
3403 			wline = NULL;
3404 		}
3405 		if (tc)
3406 			wattr_off(view->window,
3407 			    COLOR_PAIR(tc->colorpair), NULL);
3408 		if (width <= view->ncols - 1)
3409 			waddch(view->window, '\n');
3410 		nprinted++;
3411 	}
3412 	free(line);
3413 	if (nprinted >= 1)
3414 		s->last_displayed_line = s->first_displayed_line +
3415 		    (nprinted - 1);
3416 	else
3417 		s->last_displayed_line = s->first_displayed_line;
3418 
3419 	view_vborder(view);
3420 
3421 	if (s->eof) {
3422 		while (nprinted < view->nlines) {
3423 			waddch(view->window, '\n');
3424 			nprinted++;
3425 		}
3426 
3427 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3428 		    view->ncols, 0, 0);
3429 		if (err) {
3430 			return err;
3431 		}
3432 
3433 		wstandout(view->window);
3434 		waddwstr(view->window, wline);
3435 		free(wline);
3436 		wline = NULL;
3437 		wstandend(view->window);
3438 	}
3439 
3440 	return NULL;
3441 }
3442 
3443 static char *
3444 get_datestr(time_t *time, char *datebuf)
3445 {
3446 	struct tm mytm, *tm;
3447 	char *p, *s;
3448 
3449 	tm = gmtime_r(time, &mytm);
3450 	if (tm == NULL)
3451 		return NULL;
3452 	s = asctime_r(tm, datebuf);
3453 	if (s == NULL)
3454 		return NULL;
3455 	p = strchr(s, '\n');
3456 	if (p)
3457 		*p = '\0';
3458 	return s;
3459 }
3460 
3461 static const struct got_error *
3462 get_changed_paths(struct got_pathlist_head *paths,
3463     struct got_commit_object *commit, struct got_repository *repo)
3464 {
3465 	const struct got_error *err = NULL;
3466 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3467 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3468 	struct got_object_qid *qid;
3469 
3470 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3471 	if (qid != NULL) {
3472 		struct got_commit_object *pcommit;
3473 		err = got_object_open_as_commit(&pcommit, repo,
3474 		    &qid->id);
3475 		if (err)
3476 			return err;
3477 
3478 		tree_id1 = got_object_id_dup(
3479 		    got_object_commit_get_tree_id(pcommit));
3480 		if (tree_id1 == NULL) {
3481 			got_object_commit_close(pcommit);
3482 			return got_error_from_errno("got_object_id_dup");
3483 		}
3484 		got_object_commit_close(pcommit);
3485 
3486 	}
3487 
3488 	if (tree_id1) {
3489 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
3490 		if (err)
3491 			goto done;
3492 	}
3493 
3494 	tree_id2 = got_object_commit_get_tree_id(commit);
3495 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3496 	if (err)
3497 		goto done;
3498 
3499 	err = got_diff_tree(tree1, tree2, NULL, NULL, "", "", repo,
3500 	    got_diff_tree_collect_changed_paths, paths, 0);
3501 done:
3502 	if (tree1)
3503 		got_object_tree_close(tree1);
3504 	if (tree2)
3505 		got_object_tree_close(tree2);
3506 	free(tree_id1);
3507 	return err;
3508 }
3509 
3510 static const struct got_error *
3511 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
3512 {
3513 	off_t *p;
3514 
3515 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
3516 	if (p == NULL)
3517 		return got_error_from_errno("reallocarray");
3518 	*line_offsets = p;
3519 	(*line_offsets)[*nlines] = off;
3520 	(*nlines)++;
3521 	return NULL;
3522 }
3523 
3524 static const struct got_error *
3525 write_commit_info(off_t **line_offsets, size_t *nlines,
3526     struct got_object_id *commit_id, struct got_reflist_head *refs,
3527     struct got_repository *repo, FILE *outfile)
3528 {
3529 	const struct got_error *err = NULL;
3530 	char datebuf[26], *datestr;
3531 	struct got_commit_object *commit;
3532 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
3533 	time_t committer_time;
3534 	const char *author, *committer;
3535 	char *refs_str = NULL;
3536 	struct got_pathlist_head changed_paths;
3537 	struct got_pathlist_entry *pe;
3538 	off_t outoff = 0;
3539 	int n;
3540 
3541 	TAILQ_INIT(&changed_paths);
3542 
3543 	if (refs) {
3544 		err = build_refs_str(&refs_str, refs, commit_id, repo);
3545 		if (err)
3546 			return err;
3547 	}
3548 
3549 	err = got_object_open_as_commit(&commit, repo, commit_id);
3550 	if (err)
3551 		return err;
3552 
3553 	err = got_object_id_str(&id_str, commit_id);
3554 	if (err) {
3555 		err = got_error_from_errno("got_object_id_str");
3556 		goto done;
3557 	}
3558 
3559 	err = add_line_offset(line_offsets, nlines, 0);
3560 	if (err)
3561 		goto done;
3562 
3563 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
3564 	    refs_str ? refs_str : "", refs_str ? ")" : "");
3565 	if (n < 0) {
3566 		err = got_error_from_errno("fprintf");
3567 		goto done;
3568 	}
3569 	outoff += n;
3570 	err = add_line_offset(line_offsets, nlines, outoff);
3571 	if (err)
3572 		goto done;
3573 
3574 	n = fprintf(outfile, "from: %s\n",
3575 	    got_object_commit_get_author(commit));
3576 	if (n < 0) {
3577 		err = got_error_from_errno("fprintf");
3578 		goto done;
3579 	}
3580 	outoff += n;
3581 	err = add_line_offset(line_offsets, nlines, outoff);
3582 	if (err)
3583 		goto done;
3584 
3585 	committer_time = got_object_commit_get_committer_time(commit);
3586 	datestr = get_datestr(&committer_time, datebuf);
3587 	if (datestr) {
3588 		n = fprintf(outfile, "date: %s UTC\n", datestr);
3589 		if (n < 0) {
3590 			err = got_error_from_errno("fprintf");
3591 			goto done;
3592 		}
3593 		outoff += n;
3594 		err = add_line_offset(line_offsets, nlines, outoff);
3595 		if (err)
3596 			goto done;
3597 	}
3598 	author = got_object_commit_get_author(commit);
3599 	committer = got_object_commit_get_committer(commit);
3600 	if (strcmp(author, committer) != 0) {
3601 		n = fprintf(outfile, "via: %s\n", committer);
3602 		if (n < 0) {
3603 			err = got_error_from_errno("fprintf");
3604 			goto done;
3605 		}
3606 		outoff += n;
3607 		err = add_line_offset(line_offsets, nlines, outoff);
3608 		if (err)
3609 			goto done;
3610 	}
3611 	if (got_object_commit_get_nparents(commit) > 1) {
3612 		const struct got_object_id_queue *parent_ids;
3613 		struct got_object_qid *qid;
3614 		int pn = 1;
3615 		parent_ids = got_object_commit_get_parent_ids(commit);
3616 		STAILQ_FOREACH(qid, parent_ids, entry) {
3617 			err = got_object_id_str(&id_str, &qid->id);
3618 			if (err)
3619 				goto done;
3620 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
3621 			if (n < 0) {
3622 				err = got_error_from_errno("fprintf");
3623 				goto done;
3624 			}
3625 			outoff += n;
3626 			err = add_line_offset(line_offsets, nlines, outoff);
3627 			if (err)
3628 				goto done;
3629 			free(id_str);
3630 			id_str = NULL;
3631 		}
3632 	}
3633 
3634 	err = got_object_commit_get_logmsg(&logmsg, commit);
3635 	if (err)
3636 		goto done;
3637 	s = logmsg;
3638 	while ((line = strsep(&s, "\n")) != NULL) {
3639 		n = fprintf(outfile, "%s\n", line);
3640 		if (n < 0) {
3641 			err = got_error_from_errno("fprintf");
3642 			goto done;
3643 		}
3644 		outoff += n;
3645 		err = add_line_offset(line_offsets, nlines, outoff);
3646 		if (err)
3647 			goto done;
3648 	}
3649 
3650 	err = get_changed_paths(&changed_paths, commit, repo);
3651 	if (err)
3652 		goto done;
3653 	TAILQ_FOREACH(pe, &changed_paths, entry) {
3654 		struct got_diff_changed_path *cp = pe->data;
3655 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
3656 		if (n < 0) {
3657 			err = got_error_from_errno("fprintf");
3658 			goto done;
3659 		}
3660 		outoff += n;
3661 		err = add_line_offset(line_offsets, nlines, outoff);
3662 		if (err)
3663 			goto done;
3664 		free((char *)pe->path);
3665 		free(pe->data);
3666 	}
3667 
3668 	fputc('\n', outfile);
3669 	outoff++;
3670 	err = add_line_offset(line_offsets, nlines, outoff);
3671 done:
3672 	got_pathlist_free(&changed_paths);
3673 	free(id_str);
3674 	free(logmsg);
3675 	free(refs_str);
3676 	got_object_commit_close(commit);
3677 	if (err) {
3678 		free(*line_offsets);
3679 		*line_offsets = NULL;
3680 		*nlines = 0;
3681 	}
3682 	return err;
3683 }
3684 
3685 static const struct got_error *
3686 create_diff(struct tog_diff_view_state *s)
3687 {
3688 	const struct got_error *err = NULL;
3689 	FILE *f = NULL;
3690 	int obj_type;
3691 
3692 	free(s->line_offsets);
3693 	s->line_offsets = malloc(sizeof(off_t));
3694 	if (s->line_offsets == NULL)
3695 		return got_error_from_errno("malloc");
3696 	s->nlines = 0;
3697 
3698 	f = got_opentemp();
3699 	if (f == NULL) {
3700 		err = got_error_from_errno("got_opentemp");
3701 		goto done;
3702 	}
3703 	if (s->f && fclose(s->f) == EOF) {
3704 		err = got_error_from_errno("fclose");
3705 		goto done;
3706 	}
3707 	s->f = f;
3708 
3709 	if (s->id1)
3710 		err = got_object_get_type(&obj_type, s->repo, s->id1);
3711 	else
3712 		err = got_object_get_type(&obj_type, s->repo, s->id2);
3713 	if (err)
3714 		goto done;
3715 
3716 	switch (obj_type) {
3717 	case GOT_OBJ_TYPE_BLOB:
3718 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
3719 		    s->f1, s->f2, s->id1, s->id2, s->label1, s->label2,
3720 		    s->diff_context, s->ignore_whitespace, s->force_text_diff,
3721 		    s->repo, s->f);
3722 		break;
3723 	case GOT_OBJ_TYPE_TREE:
3724 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
3725 		    s->f1, s->f2, s->id1, s->id2, NULL, "", "", s->diff_context,
3726 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3727 		break;
3728 	case GOT_OBJ_TYPE_COMMIT: {
3729 		const struct got_object_id_queue *parent_ids;
3730 		struct got_object_qid *pid;
3731 		struct got_commit_object *commit2;
3732 		struct got_reflist_head *refs;
3733 
3734 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
3735 		if (err)
3736 			goto done;
3737 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
3738 		/* Show commit info if we're diffing to a parent/root commit. */
3739 		if (s->id1 == NULL) {
3740 			err = write_commit_info(&s->line_offsets, &s->nlines,
3741 			    s->id2, refs, s->repo, s->f);
3742 			if (err)
3743 				goto done;
3744 		} else {
3745 			parent_ids = got_object_commit_get_parent_ids(commit2);
3746 			STAILQ_FOREACH(pid, parent_ids, entry) {
3747 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
3748 					err = write_commit_info(
3749 					    &s->line_offsets, &s->nlines,
3750 					    s->id2, refs, s->repo, s->f);
3751 					if (err)
3752 						goto done;
3753 					break;
3754 				}
3755 			}
3756 		}
3757 		got_object_commit_close(commit2);
3758 
3759 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
3760 		    s->f1, s->f2, s->id1, s->id2, NULL, s->diff_context,
3761 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3762 		break;
3763 	}
3764 	default:
3765 		err = got_error(GOT_ERR_OBJ_TYPE);
3766 		break;
3767 	}
3768 	if (err)
3769 		goto done;
3770 done:
3771 	if (s->f && fflush(s->f) != 0 && err == NULL)
3772 		err = got_error_from_errno("fflush");
3773 	return err;
3774 }
3775 
3776 static void
3777 diff_view_indicate_progress(struct tog_view *view)
3778 {
3779 	mvwaddstr(view->window, 0, 0, "diffing...");
3780 	update_panels();
3781 	doupdate();
3782 }
3783 
3784 static const struct got_error *
3785 search_start_diff_view(struct tog_view *view)
3786 {
3787 	struct tog_diff_view_state *s = &view->state.diff;
3788 
3789 	s->matched_line = 0;
3790 	return NULL;
3791 }
3792 
3793 static const struct got_error *
3794 search_next_diff_view(struct tog_view *view)
3795 {
3796 	struct tog_diff_view_state *s = &view->state.diff;
3797 	const struct got_error *err = NULL;
3798 	int lineno;
3799 	char *line = NULL;
3800 	size_t linesize = 0;
3801 	ssize_t linelen;
3802 
3803 	if (!view->searching) {
3804 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
3805 		return NULL;
3806 	}
3807 
3808 	if (s->matched_line) {
3809 		if (view->searching == TOG_SEARCH_FORWARD)
3810 			lineno = s->matched_line + 1;
3811 		else
3812 			lineno = s->matched_line - 1;
3813 	} else
3814 		lineno = s->first_displayed_line;
3815 
3816 	while (1) {
3817 		off_t offset;
3818 
3819 		if (lineno <= 0 || lineno > s->nlines) {
3820 			if (s->matched_line == 0) {
3821 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3822 				break;
3823 			}
3824 
3825 			if (view->searching == TOG_SEARCH_FORWARD)
3826 				lineno = 1;
3827 			else
3828 				lineno = s->nlines;
3829 		}
3830 
3831 		offset = s->line_offsets[lineno - 1];
3832 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
3833 			free(line);
3834 			return got_error_from_errno("fseeko");
3835 		}
3836 		linelen = getline(&line, &linesize, s->f);
3837 		if (linelen != -1) {
3838 			char *exstr;
3839 			err = expand_tab(&exstr, line);
3840 			if (err)
3841 				break;
3842 			if (match_line(exstr, &view->regex, 1,
3843 			    &view->regmatch)) {
3844 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
3845 				s->matched_line = lineno;
3846 				free(exstr);
3847 				break;
3848 			}
3849 			free(exstr);
3850 		}
3851 		if (view->searching == TOG_SEARCH_FORWARD)
3852 			lineno++;
3853 		else
3854 			lineno--;
3855 	}
3856 	free(line);
3857 
3858 	if (s->matched_line) {
3859 		s->first_displayed_line = s->matched_line;
3860 		s->selected_line = 1;
3861 	}
3862 
3863 	return err;
3864 }
3865 
3866 static const struct got_error *
3867 close_diff_view(struct tog_view *view)
3868 {
3869 	const struct got_error *err = NULL;
3870 	struct tog_diff_view_state *s = &view->state.diff;
3871 
3872 	free(s->id1);
3873 	s->id1 = NULL;
3874 	free(s->id2);
3875 	s->id2 = NULL;
3876 	if (s->f && fclose(s->f) == EOF)
3877 		err = got_error_from_errno("fclose");
3878 	s->f = NULL;
3879 	if (s->f1 && fclose(s->f1) == EOF)
3880 		err = got_error_from_errno("fclose");
3881 	s->f1 = NULL;
3882 	if (s->f2 && fclose(s->f2) == EOF)
3883 		err = got_error_from_errno("fclose");
3884 	s->f2 = NULL;
3885 	free_colors(&s->colors);
3886 	free(s->line_offsets);
3887 	s->line_offsets = NULL;
3888 	s->nlines = 0;
3889 	return err;
3890 }
3891 
3892 static const struct got_error *
3893 open_diff_view(struct tog_view *view, struct got_object_id *id1,
3894     struct got_object_id *id2, const char *label1, const char *label2,
3895     int diff_context, int ignore_whitespace, int force_text_diff,
3896     struct tog_view *log_view, struct got_repository *repo)
3897 {
3898 	const struct got_error *err;
3899 	struct tog_diff_view_state *s = &view->state.diff;
3900 
3901 	memset(s, 0, sizeof(*s));
3902 
3903 	if (id1 != NULL && id2 != NULL) {
3904 	    int type1, type2;
3905 	    err = got_object_get_type(&type1, repo, id1);
3906 	    if (err)
3907 		return err;
3908 	    err = got_object_get_type(&type2, repo, id2);
3909 	    if (err)
3910 		return err;
3911 
3912 	    if (type1 != type2)
3913 		return got_error(GOT_ERR_OBJ_TYPE);
3914 	}
3915 	s->first_displayed_line = 1;
3916 	s->last_displayed_line = view->nlines;
3917 	s->selected_line = 1;
3918 	s->repo = repo;
3919 	s->id1 = id1;
3920 	s->id2 = id2;
3921 	s->label1 = label1;
3922 	s->label2 = label2;
3923 
3924 	if (id1) {
3925 		s->id1 = got_object_id_dup(id1);
3926 		if (s->id1 == NULL)
3927 			return got_error_from_errno("got_object_id_dup");
3928 	} else
3929 		s->id1 = NULL;
3930 
3931 	s->id2 = got_object_id_dup(id2);
3932 	if (s->id2 == NULL) {
3933 		err = got_error_from_errno("got_object_id_dup");
3934 		goto done;
3935 	}
3936 
3937 	s->f1 = got_opentemp();
3938 	if (s->f1 == NULL) {
3939 		err = got_error_from_errno("got_opentemp");
3940 		goto done;
3941 	}
3942 
3943 	s->f2 = got_opentemp();
3944 	if (s->f2 == NULL) {
3945 		err = got_error_from_errno("got_opentemp");
3946 		goto done;
3947 	}
3948 
3949 	s->first_displayed_line = 1;
3950 	s->last_displayed_line = view->nlines;
3951 	s->diff_context = diff_context;
3952 	s->ignore_whitespace = ignore_whitespace;
3953 	s->force_text_diff = force_text_diff;
3954 	s->log_view = log_view;
3955 	s->repo = repo;
3956 
3957 	STAILQ_INIT(&s->colors);
3958 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3959 		err = add_color(&s->colors,
3960 		    "^-", TOG_COLOR_DIFF_MINUS,
3961 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
3962 		if (err)
3963 			goto done;
3964 		err = add_color(&s->colors, "^\\+",
3965 		    TOG_COLOR_DIFF_PLUS,
3966 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
3967 		if (err)
3968 			goto done;
3969 		err = add_color(&s->colors,
3970 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
3971 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
3972 		if (err)
3973 			goto done;
3974 
3975 		err = add_color(&s->colors,
3976 		    "^(commit [0-9a-f]|parent [0-9]|(blob|file) [-+] |"
3977 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
3978 		    get_color_value("TOG_COLOR_DIFF_META"));
3979 		if (err)
3980 			goto done;
3981 
3982 		err = add_color(&s->colors,
3983 		    "^(from|via): ", TOG_COLOR_AUTHOR,
3984 		    get_color_value("TOG_COLOR_AUTHOR"));
3985 		if (err)
3986 			goto done;
3987 
3988 		err = add_color(&s->colors,
3989 		    "^date: ", TOG_COLOR_DATE,
3990 		    get_color_value("TOG_COLOR_DATE"));
3991 		if (err)
3992 			goto done;
3993 	}
3994 
3995 	if (log_view && view_is_splitscreen(view))
3996 		show_log_view(log_view); /* draw vborder */
3997 	diff_view_indicate_progress(view);
3998 
3999 	err = create_diff(s);
4000 
4001 	view->show = show_diff_view;
4002 	view->input = input_diff_view;
4003 	view->close = close_diff_view;
4004 	view->search_start = search_start_diff_view;
4005 	view->search_next = search_next_diff_view;
4006 done:
4007 	if (err)
4008 		close_diff_view(view);
4009 	return err;
4010 }
4011 
4012 static const struct got_error *
4013 show_diff_view(struct tog_view *view)
4014 {
4015 	const struct got_error *err;
4016 	struct tog_diff_view_state *s = &view->state.diff;
4017 	char *id_str1 = NULL, *id_str2, *header;
4018 	const char *label1, *label2;
4019 
4020 	if (s->id1) {
4021 		err = got_object_id_str(&id_str1, s->id1);
4022 		if (err)
4023 			return err;
4024 		label1 = s->label1 ? : id_str1;
4025 	} else
4026 		label1 = "/dev/null";
4027 
4028 	err = got_object_id_str(&id_str2, s->id2);
4029 	if (err)
4030 		return err;
4031 	label2 = s->label2 ? : id_str2;
4032 
4033 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4034 		err = got_error_from_errno("asprintf");
4035 		free(id_str1);
4036 		free(id_str2);
4037 		return err;
4038 	}
4039 	free(id_str1);
4040 	free(id_str2);
4041 
4042 	err = draw_file(view, header);
4043 	free(header);
4044 	return err;
4045 }
4046 
4047 static const struct got_error *
4048 set_selected_commit(struct tog_diff_view_state *s,
4049     struct commit_queue_entry *entry)
4050 {
4051 	const struct got_error *err;
4052 	const struct got_object_id_queue *parent_ids;
4053 	struct got_commit_object *selected_commit;
4054 	struct got_object_qid *pid;
4055 
4056 	free(s->id2);
4057 	s->id2 = got_object_id_dup(entry->id);
4058 	if (s->id2 == NULL)
4059 		return got_error_from_errno("got_object_id_dup");
4060 
4061 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4062 	if (err)
4063 		return err;
4064 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4065 	free(s->id1);
4066 	pid = STAILQ_FIRST(parent_ids);
4067 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4068 	got_object_commit_close(selected_commit);
4069 	return NULL;
4070 }
4071 
4072 static const struct got_error *
4073 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4074 {
4075 	const struct got_error *err = NULL;
4076 	struct tog_diff_view_state *s = &view->state.diff;
4077 	struct tog_log_view_state *ls;
4078 	struct commit_queue_entry *old_selected_entry;
4079 	char *line = NULL;
4080 	size_t linesize = 0;
4081 	ssize_t linelen;
4082 	int i, nscroll = view->nlines - 1;
4083 
4084 	switch (ch) {
4085 	case '0':
4086 		view->x = 0;
4087 		break;
4088 	case '$':
4089 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4090 		view->count = 0;
4091 		break;
4092 	case KEY_RIGHT:
4093 	case 'l':
4094 		if (view->x + view->ncols / 3 < view->maxx)
4095 			view->x += 2;  /* move two columns right */
4096 		else
4097 			view->count = 0;
4098 		break;
4099 	case KEY_LEFT:
4100 	case 'h':
4101 		view->x -= MIN(view->x, 2);  /* move two columns back */
4102 		if (view->x <= 0)
4103 			view->count = 0;
4104 		break;
4105 	case 'a':
4106 	case 'w':
4107 		if (ch == 'a')
4108 			s->force_text_diff = !s->force_text_diff;
4109 		if (ch == 'w')
4110 			s->ignore_whitespace = !s->ignore_whitespace;
4111 		wclear(view->window);
4112 		s->first_displayed_line = 1;
4113 		s->last_displayed_line = view->nlines;
4114 		s->matched_line = 0;
4115 		diff_view_indicate_progress(view);
4116 		err = create_diff(s);
4117 		view->count = 0;
4118 		break;
4119 	case 'g':
4120 	case KEY_HOME:
4121 		s->first_displayed_line = 1;
4122 		view->count = 0;
4123 		break;
4124 	case 'G':
4125 	case KEY_END:
4126 		view->count = 0;
4127 		if (s->eof)
4128 			break;
4129 
4130 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4131 		s->eof = 1;
4132 		break;
4133 	case 'k':
4134 	case KEY_UP:
4135 	case CTRL('p'):
4136 		if (s->first_displayed_line > 1)
4137 			s->first_displayed_line--;
4138 		else
4139 			view->count = 0;
4140 		break;
4141 	case CTRL('u'):
4142 	case 'u':
4143 		nscroll /= 2;
4144 		/* FALL THROUGH */
4145 	case KEY_PPAGE:
4146 	case CTRL('b'):
4147 	case 'b':
4148 		if (s->first_displayed_line == 1) {
4149 			view->count = 0;
4150 			break;
4151 		}
4152 		i = 0;
4153 		while (i++ < nscroll && s->first_displayed_line > 1)
4154 			s->first_displayed_line--;
4155 		break;
4156 	case 'j':
4157 	case KEY_DOWN:
4158 	case CTRL('n'):
4159 		if (!s->eof)
4160 			s->first_displayed_line++;
4161 		else
4162 			view->count = 0;
4163 		break;
4164 	case CTRL('d'):
4165 	case 'd':
4166 		nscroll /= 2;
4167 		/* FALL THROUGH */
4168 	case KEY_NPAGE:
4169 	case CTRL('f'):
4170 	case 'f':
4171 	case ' ':
4172 		if (s->eof) {
4173 			view->count = 0;
4174 			break;
4175 		}
4176 		i = 0;
4177 		while (!s->eof && i++ < nscroll) {
4178 			linelen = getline(&line, &linesize, s->f);
4179 			s->first_displayed_line++;
4180 			if (linelen == -1) {
4181 				if (feof(s->f)) {
4182 					s->eof = 1;
4183 				} else
4184 					err = got_ferror(s->f, GOT_ERR_IO);
4185 				break;
4186 			}
4187 		}
4188 		free(line);
4189 		break;
4190 	case '[':
4191 		if (s->diff_context > 0) {
4192 			s->diff_context--;
4193 			s->matched_line = 0;
4194 			diff_view_indicate_progress(view);
4195 			err = create_diff(s);
4196 			if (s->first_displayed_line + view->nlines - 1 >
4197 			    s->nlines) {
4198 				s->first_displayed_line = 1;
4199 				s->last_displayed_line = view->nlines;
4200 			}
4201 		} else
4202 			view->count = 0;
4203 		break;
4204 	case ']':
4205 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4206 			s->diff_context++;
4207 			s->matched_line = 0;
4208 			diff_view_indicate_progress(view);
4209 			err = create_diff(s);
4210 		} else
4211 			view->count = 0;
4212 		break;
4213 	case '<':
4214 	case ',':
4215 		if (s->log_view == NULL) {
4216 			view->count = 0;
4217 			break;
4218 		}
4219 		ls = &s->log_view->state.log;
4220 		old_selected_entry = ls->selected_entry;
4221 
4222 		/* view->count handled in input_log_view() */
4223 		err = input_log_view(NULL, s->log_view, KEY_UP);
4224 		if (err)
4225 			break;
4226 
4227 		if (old_selected_entry == ls->selected_entry)
4228 			break;
4229 
4230 		err = set_selected_commit(s, ls->selected_entry);
4231 		if (err)
4232 			break;
4233 
4234 		s->first_displayed_line = 1;
4235 		s->last_displayed_line = view->nlines;
4236 		s->matched_line = 0;
4237 		view->x = 0;
4238 
4239 		diff_view_indicate_progress(view);
4240 		err = create_diff(s);
4241 		break;
4242 	case '>':
4243 	case '.':
4244 		if (s->log_view == NULL) {
4245 			view->count = 0;
4246 			break;
4247 		}
4248 		ls = &s->log_view->state.log;
4249 		old_selected_entry = ls->selected_entry;
4250 
4251 		/* view->count handled in input_log_view() */
4252 		err = input_log_view(NULL, s->log_view, KEY_DOWN);
4253 		if (err)
4254 			break;
4255 
4256 		if (old_selected_entry == ls->selected_entry)
4257 			break;
4258 
4259 		err = set_selected_commit(s, ls->selected_entry);
4260 		if (err)
4261 			break;
4262 
4263 		s->first_displayed_line = 1;
4264 		s->last_displayed_line = view->nlines;
4265 		s->matched_line = 0;
4266 		view->x = 0;
4267 
4268 		diff_view_indicate_progress(view);
4269 		err = create_diff(s);
4270 		break;
4271 	default:
4272 		view->count = 0;
4273 		break;
4274 	}
4275 
4276 	return err;
4277 }
4278 
4279 static const struct got_error *
4280 cmd_diff(int argc, char *argv[])
4281 {
4282 	const struct got_error *error = NULL;
4283 	struct got_repository *repo = NULL;
4284 	struct got_worktree *worktree = NULL;
4285 	struct got_object_id *id1 = NULL, *id2 = NULL;
4286 	char *repo_path = NULL, *cwd = NULL;
4287 	char *id_str1 = NULL, *id_str2 = NULL;
4288 	char *label1 = NULL, *label2 = NULL;
4289 	int diff_context = 3, ignore_whitespace = 0;
4290 	int ch, force_text_diff = 0;
4291 	const char *errstr;
4292 	struct tog_view *view;
4293 	int *pack_fds = NULL;
4294 
4295 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4296 		switch (ch) {
4297 		case 'a':
4298 			force_text_diff = 1;
4299 			break;
4300 		case 'C':
4301 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4302 			    &errstr);
4303 			if (errstr != NULL)
4304 				errx(1, "number of context lines is %s: %s",
4305 				    errstr, errstr);
4306 			break;
4307 		case 'r':
4308 			repo_path = realpath(optarg, NULL);
4309 			if (repo_path == NULL)
4310 				return got_error_from_errno2("realpath",
4311 				    optarg);
4312 			got_path_strip_trailing_slashes(repo_path);
4313 			break;
4314 		case 'w':
4315 			ignore_whitespace = 1;
4316 			break;
4317 		default:
4318 			usage_diff();
4319 			/* NOTREACHED */
4320 		}
4321 	}
4322 
4323 	argc -= optind;
4324 	argv += optind;
4325 
4326 	if (argc == 0) {
4327 		usage_diff(); /* TODO show local worktree changes */
4328 	} else if (argc == 2) {
4329 		id_str1 = argv[0];
4330 		id_str2 = argv[1];
4331 	} else
4332 		usage_diff();
4333 
4334 	error = got_repo_pack_fds_open(&pack_fds);
4335 	if (error)
4336 		goto done;
4337 
4338 	if (repo_path == NULL) {
4339 		cwd = getcwd(NULL, 0);
4340 		if (cwd == NULL)
4341 			return got_error_from_errno("getcwd");
4342 		error = got_worktree_open(&worktree, cwd);
4343 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4344 			goto done;
4345 		if (worktree)
4346 			repo_path =
4347 			    strdup(got_worktree_get_repo_path(worktree));
4348 		else
4349 			repo_path = strdup(cwd);
4350 		if (repo_path == NULL) {
4351 			error = got_error_from_errno("strdup");
4352 			goto done;
4353 		}
4354 	}
4355 
4356 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4357 	if (error)
4358 		goto done;
4359 
4360 	init_curses();
4361 
4362 	error = apply_unveil(got_repo_get_path(repo), NULL);
4363 	if (error)
4364 		goto done;
4365 
4366 	error = tog_load_refs(repo, 0);
4367 	if (error)
4368 		goto done;
4369 
4370 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4371 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4372 	if (error)
4373 		goto done;
4374 
4375 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4376 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4377 	if (error)
4378 		goto done;
4379 
4380 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4381 	if (view == NULL) {
4382 		error = got_error_from_errno("view_open");
4383 		goto done;
4384 	}
4385 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4386 	    ignore_whitespace, force_text_diff, NULL,  repo);
4387 	if (error)
4388 		goto done;
4389 	error = view_loop(view);
4390 done:
4391 	free(label1);
4392 	free(label2);
4393 	free(repo_path);
4394 	free(cwd);
4395 	if (repo) {
4396 		const struct got_error *close_err = got_repo_close(repo);
4397 		if (error == NULL)
4398 			error = close_err;
4399 	}
4400 	if (worktree)
4401 		got_worktree_close(worktree);
4402 	if (pack_fds) {
4403 		const struct got_error *pack_err =
4404 		    got_repo_pack_fds_close(pack_fds);
4405 		if (error == NULL)
4406 			error = pack_err;
4407 	}
4408 	tog_free_refs();
4409 	return error;
4410 }
4411 
4412 __dead static void
4413 usage_blame(void)
4414 {
4415 	endwin();
4416 	fprintf(stderr,
4417 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
4418 	    getprogname());
4419 	exit(1);
4420 }
4421 
4422 struct tog_blame_line {
4423 	int annotated;
4424 	struct got_object_id *id;
4425 };
4426 
4427 static const struct got_error *
4428 draw_blame(struct tog_view *view)
4429 {
4430 	struct tog_blame_view_state *s = &view->state.blame;
4431 	struct tog_blame *blame = &s->blame;
4432 	regmatch_t *regmatch = &view->regmatch;
4433 	const struct got_error *err;
4434 	int lineno = 0, nprinted = 0;
4435 	char *line = NULL;
4436 	size_t linesize = 0;
4437 	ssize_t linelen;
4438 	wchar_t *wline;
4439 	int width;
4440 	struct tog_blame_line *blame_line;
4441 	struct got_object_id *prev_id = NULL;
4442 	char *id_str;
4443 	struct tog_color *tc;
4444 
4445 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
4446 	if (err)
4447 		return err;
4448 
4449 	rewind(blame->f);
4450 	werase(view->window);
4451 
4452 	if (asprintf(&line, "commit %s", id_str) == -1) {
4453 		err = got_error_from_errno("asprintf");
4454 		free(id_str);
4455 		return err;
4456 	}
4457 
4458 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4459 	free(line);
4460 	line = NULL;
4461 	if (err)
4462 		return err;
4463 	if (view_needs_focus_indication(view))
4464 		wstandout(view->window);
4465 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4466 	if (tc)
4467 		wattr_on(view->window,
4468 		    COLOR_PAIR(tc->colorpair), NULL);
4469 	waddwstr(view->window, wline);
4470 	if (tc)
4471 		wattr_off(view->window,
4472 		    COLOR_PAIR(tc->colorpair), NULL);
4473 	if (view_needs_focus_indication(view))
4474 		wstandend(view->window);
4475 	free(wline);
4476 	wline = NULL;
4477 	if (width < view->ncols - 1)
4478 		waddch(view->window, '\n');
4479 
4480 	if (asprintf(&line, "[%d/%d] %s%s",
4481 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
4482 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
4483 		free(id_str);
4484 		return got_error_from_errno("asprintf");
4485 	}
4486 	free(id_str);
4487 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4488 	free(line);
4489 	line = NULL;
4490 	if (err)
4491 		return err;
4492 	waddwstr(view->window, wline);
4493 	free(wline);
4494 	wline = NULL;
4495 	if (width < view->ncols - 1)
4496 		waddch(view->window, '\n');
4497 
4498 	s->eof = 0;
4499 	view->maxx = 0;
4500 	while (nprinted < view->nlines - 2) {
4501 		linelen = getline(&line, &linesize, blame->f);
4502 		if (linelen == -1) {
4503 			if (feof(blame->f)) {
4504 				s->eof = 1;
4505 				break;
4506 			}
4507 			free(line);
4508 			return got_ferror(blame->f, GOT_ERR_IO);
4509 		}
4510 		if (++lineno < s->first_displayed_line)
4511 			continue;
4512 
4513 		/* Set view->maxx based on full line length. */
4514 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
4515 		if (err) {
4516 			free(line);
4517 			return err;
4518 		}
4519 		free(wline);
4520 		wline = NULL;
4521 		view->maxx = MAX(view->maxx, width);
4522 
4523 		if (view->focussed && nprinted == s->selected_line - 1)
4524 			wstandout(view->window);
4525 
4526 		if (blame->nlines > 0) {
4527 			blame_line = &blame->lines[lineno - 1];
4528 			if (blame_line->annotated && prev_id &&
4529 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4530 			    !(view->focussed &&
4531 			    nprinted == s->selected_line - 1)) {
4532 				waddstr(view->window, "        ");
4533 			} else if (blame_line->annotated) {
4534 				char *id_str;
4535 				err = got_object_id_str(&id_str,
4536 				    blame_line->id);
4537 				if (err) {
4538 					free(line);
4539 					return err;
4540 				}
4541 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4542 				if (tc)
4543 					wattr_on(view->window,
4544 					    COLOR_PAIR(tc->colorpair), NULL);
4545 				wprintw(view->window, "%.8s", id_str);
4546 				if (tc)
4547 					wattr_off(view->window,
4548 					    COLOR_PAIR(tc->colorpair), NULL);
4549 				free(id_str);
4550 				prev_id = blame_line->id;
4551 			} else {
4552 				waddstr(view->window, "........");
4553 				prev_id = NULL;
4554 			}
4555 		} else {
4556 			waddstr(view->window, "........");
4557 			prev_id = NULL;
4558 		}
4559 
4560 		if (view->focussed && nprinted == s->selected_line - 1)
4561 			wstandend(view->window);
4562 		waddstr(view->window, " ");
4563 
4564 		if (view->ncols <= 9) {
4565 			width = 9;
4566 		} else if (s->first_displayed_line + nprinted ==
4567 		    s->matched_line &&
4568 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4569 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4570 			    view->window, view->x, regmatch);
4571 			if (err) {
4572 				free(line);
4573 				return err;
4574 			}
4575 			width += 9;
4576 		} else {
4577 			int skip;
4578 			err = format_line(&wline, &width, &skip, line,
4579 			    view->x, view->ncols - 9, 9, 1);
4580 			if (err) {
4581 				free(line);
4582 				return err;
4583 			}
4584 			waddwstr(view->window, &wline[skip]);
4585 			width += 9;
4586 			free(wline);
4587 			wline = NULL;
4588 		}
4589 
4590 		if (width <= view->ncols - 1)
4591 			waddch(view->window, '\n');
4592 		if (++nprinted == 1)
4593 			s->first_displayed_line = lineno;
4594 	}
4595 	free(line);
4596 	s->last_displayed_line = lineno;
4597 
4598 	view_vborder(view);
4599 
4600 	return NULL;
4601 }
4602 
4603 static const struct got_error *
4604 blame_cb(void *arg, int nlines, int lineno,
4605     struct got_commit_object *commit, struct got_object_id *id)
4606 {
4607 	const struct got_error *err = NULL;
4608 	struct tog_blame_cb_args *a = arg;
4609 	struct tog_blame_line *line;
4610 	int errcode;
4611 
4612 	if (nlines != a->nlines ||
4613 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4614 		return got_error(GOT_ERR_RANGE);
4615 
4616 	errcode = pthread_mutex_lock(&tog_mutex);
4617 	if (errcode)
4618 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4619 
4620 	if (*a->quit) {	/* user has quit the blame view */
4621 		err = got_error(GOT_ERR_ITER_COMPLETED);
4622 		goto done;
4623 	}
4624 
4625 	if (lineno == -1)
4626 		goto done; /* no change in this commit */
4627 
4628 	line = &a->lines[lineno - 1];
4629 	if (line->annotated)
4630 		goto done;
4631 
4632 	line->id = got_object_id_dup(id);
4633 	if (line->id == NULL) {
4634 		err = got_error_from_errno("got_object_id_dup");
4635 		goto done;
4636 	}
4637 	line->annotated = 1;
4638 done:
4639 	errcode = pthread_mutex_unlock(&tog_mutex);
4640 	if (errcode)
4641 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4642 	return err;
4643 }
4644 
4645 static void *
4646 blame_thread(void *arg)
4647 {
4648 	const struct got_error *err, *close_err;
4649 	struct tog_blame_thread_args *ta = arg;
4650 	struct tog_blame_cb_args *a = ta->cb_args;
4651 	int errcode;
4652 
4653 	err = block_signals_used_by_main_thread();
4654 	if (err)
4655 		return (void *)err;
4656 
4657 	err = got_blame(ta->path, a->commit_id, ta->repo,
4658 	    blame_cb, ta->cb_args, ta->cancel_cb, ta->cancel_arg);
4659 	if (err && err->code == GOT_ERR_CANCELLED)
4660 		err = NULL;
4661 
4662 	errcode = pthread_mutex_lock(&tog_mutex);
4663 	if (errcode)
4664 		return (void *)got_error_set_errno(errcode,
4665 		    "pthread_mutex_lock");
4666 
4667 	close_err = got_repo_close(ta->repo);
4668 	if (err == NULL)
4669 		err = close_err;
4670 	ta->repo = NULL;
4671 	*ta->complete = 1;
4672 
4673 	errcode = pthread_mutex_unlock(&tog_mutex);
4674 	if (errcode && err == NULL)
4675 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4676 
4677 	return (void *)err;
4678 }
4679 
4680 static struct got_object_id *
4681 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
4682     int first_displayed_line, int selected_line)
4683 {
4684 	struct tog_blame_line *line;
4685 
4686 	if (nlines <= 0)
4687 		return NULL;
4688 
4689 	line = &lines[first_displayed_line - 1 + selected_line - 1];
4690 	if (!line->annotated)
4691 		return NULL;
4692 
4693 	return line->id;
4694 }
4695 
4696 static const struct got_error *
4697 stop_blame(struct tog_blame *blame)
4698 {
4699 	const struct got_error *err = NULL;
4700 	int i;
4701 
4702 	if (blame->thread) {
4703 		int errcode;
4704 		errcode = pthread_mutex_unlock(&tog_mutex);
4705 		if (errcode)
4706 			return got_error_set_errno(errcode,
4707 			    "pthread_mutex_unlock");
4708 		errcode = pthread_join(blame->thread, (void **)&err);
4709 		if (errcode)
4710 			return got_error_set_errno(errcode, "pthread_join");
4711 		errcode = pthread_mutex_lock(&tog_mutex);
4712 		if (errcode)
4713 			return got_error_set_errno(errcode,
4714 			    "pthread_mutex_lock");
4715 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
4716 			err = NULL;
4717 		blame->thread = NULL;
4718 	}
4719 	if (blame->thread_args.repo) {
4720 		const struct got_error *close_err;
4721 		close_err = got_repo_close(blame->thread_args.repo);
4722 		if (err == NULL)
4723 			err = close_err;
4724 		blame->thread_args.repo = NULL;
4725 	}
4726 	if (blame->f) {
4727 		if (fclose(blame->f) == EOF && err == NULL)
4728 			err = got_error_from_errno("fclose");
4729 		blame->f = NULL;
4730 	}
4731 	if (blame->lines) {
4732 		for (i = 0; i < blame->nlines; i++)
4733 			free(blame->lines[i].id);
4734 		free(blame->lines);
4735 		blame->lines = NULL;
4736 	}
4737 	free(blame->cb_args.commit_id);
4738 	blame->cb_args.commit_id = NULL;
4739 	if (blame->pack_fds) {
4740 		const struct got_error *pack_err =
4741 		    got_repo_pack_fds_close(blame->pack_fds);
4742 		if (err == NULL)
4743 			err = pack_err;
4744 		blame->pack_fds = NULL;
4745 	}
4746 	return err;
4747 }
4748 
4749 static const struct got_error *
4750 cancel_blame_view(void *arg)
4751 {
4752 	const struct got_error *err = NULL;
4753 	int *done = arg;
4754 	int errcode;
4755 
4756 	errcode = pthread_mutex_lock(&tog_mutex);
4757 	if (errcode)
4758 		return got_error_set_errno(errcode,
4759 		    "pthread_mutex_unlock");
4760 
4761 	if (*done)
4762 		err = got_error(GOT_ERR_CANCELLED);
4763 
4764 	errcode = pthread_mutex_unlock(&tog_mutex);
4765 	if (errcode)
4766 		return got_error_set_errno(errcode,
4767 		    "pthread_mutex_lock");
4768 
4769 	return err;
4770 }
4771 
4772 static const struct got_error *
4773 run_blame(struct tog_view *view)
4774 {
4775 	struct tog_blame_view_state *s = &view->state.blame;
4776 	struct tog_blame *blame = &s->blame;
4777 	const struct got_error *err = NULL;
4778 	struct got_commit_object *commit = NULL;
4779 	struct got_blob_object *blob = NULL;
4780 	struct got_repository *thread_repo = NULL;
4781 	struct got_object_id *obj_id = NULL;
4782 	int obj_type;
4783 	int *pack_fds = NULL;
4784 
4785 	err = got_object_open_as_commit(&commit, s->repo,
4786 	    &s->blamed_commit->id);
4787 	if (err)
4788 		return err;
4789 
4790 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
4791 	if (err)
4792 		goto done;
4793 
4794 	err = got_object_get_type(&obj_type, s->repo, obj_id);
4795 	if (err)
4796 		goto done;
4797 
4798 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
4799 		err = got_error(GOT_ERR_OBJ_TYPE);
4800 		goto done;
4801 	}
4802 
4803 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192);
4804 	if (err)
4805 		goto done;
4806 	blame->f = got_opentemp();
4807 	if (blame->f == NULL) {
4808 		err = got_error_from_errno("got_opentemp");
4809 		goto done;
4810 	}
4811 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
4812 	    &blame->line_offsets, blame->f, blob);
4813 	if (err)
4814 		goto done;
4815 	if (blame->nlines == 0) {
4816 		s->blame_complete = 1;
4817 		goto done;
4818 	}
4819 
4820 	/* Don't include \n at EOF in the blame line count. */
4821 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
4822 		blame->nlines--;
4823 
4824 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
4825 	if (blame->lines == NULL) {
4826 		err = got_error_from_errno("calloc");
4827 		goto done;
4828 	}
4829 
4830 	err = got_repo_pack_fds_open(&pack_fds);
4831 	if (err)
4832 		goto done;
4833 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
4834 	    pack_fds);
4835 	if (err)
4836 		goto done;
4837 
4838 	blame->pack_fds = pack_fds;
4839 	blame->cb_args.view = view;
4840 	blame->cb_args.lines = blame->lines;
4841 	blame->cb_args.nlines = blame->nlines;
4842 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
4843 	if (blame->cb_args.commit_id == NULL) {
4844 		err = got_error_from_errno("got_object_id_dup");
4845 		goto done;
4846 	}
4847 	blame->cb_args.quit = &s->done;
4848 
4849 	blame->thread_args.path = s->path;
4850 	blame->thread_args.repo = thread_repo;
4851 	blame->thread_args.cb_args = &blame->cb_args;
4852 	blame->thread_args.complete = &s->blame_complete;
4853 	blame->thread_args.cancel_cb = cancel_blame_view;
4854 	blame->thread_args.cancel_arg = &s->done;
4855 	s->blame_complete = 0;
4856 
4857 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
4858 		s->first_displayed_line = 1;
4859 		s->last_displayed_line = view->nlines;
4860 		s->selected_line = 1;
4861 	}
4862 	s->matched_line = 0;
4863 
4864 done:
4865 	if (commit)
4866 		got_object_commit_close(commit);
4867 	if (blob)
4868 		got_object_blob_close(blob);
4869 	free(obj_id);
4870 	if (err)
4871 		stop_blame(blame);
4872 	return err;
4873 }
4874 
4875 static const struct got_error *
4876 open_blame_view(struct tog_view *view, char *path,
4877     struct got_object_id *commit_id, struct got_repository *repo)
4878 {
4879 	const struct got_error *err = NULL;
4880 	struct tog_blame_view_state *s = &view->state.blame;
4881 
4882 	STAILQ_INIT(&s->blamed_commits);
4883 
4884 	s->path = strdup(path);
4885 	if (s->path == NULL)
4886 		return got_error_from_errno("strdup");
4887 
4888 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
4889 	if (err) {
4890 		free(s->path);
4891 		return err;
4892 	}
4893 
4894 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
4895 	s->first_displayed_line = 1;
4896 	s->last_displayed_line = view->nlines;
4897 	s->selected_line = 1;
4898 	s->blame_complete = 0;
4899 	s->repo = repo;
4900 	s->commit_id = commit_id;
4901 	memset(&s->blame, 0, sizeof(s->blame));
4902 
4903 	STAILQ_INIT(&s->colors);
4904 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4905 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
4906 		    get_color_value("TOG_COLOR_COMMIT"));
4907 		if (err)
4908 			return err;
4909 	}
4910 
4911 	view->show = show_blame_view;
4912 	view->input = input_blame_view;
4913 	view->close = close_blame_view;
4914 	view->search_start = search_start_blame_view;
4915 	view->search_next = search_next_blame_view;
4916 
4917 	return run_blame(view);
4918 }
4919 
4920 static const struct got_error *
4921 close_blame_view(struct tog_view *view)
4922 {
4923 	const struct got_error *err = NULL;
4924 	struct tog_blame_view_state *s = &view->state.blame;
4925 
4926 	if (s->blame.thread)
4927 		err = stop_blame(&s->blame);
4928 
4929 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
4930 		struct got_object_qid *blamed_commit;
4931 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
4932 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
4933 		got_object_qid_free(blamed_commit);
4934 	}
4935 
4936 	free(s->path);
4937 	free_colors(&s->colors);
4938 	return err;
4939 }
4940 
4941 static const struct got_error *
4942 search_start_blame_view(struct tog_view *view)
4943 {
4944 	struct tog_blame_view_state *s = &view->state.blame;
4945 
4946 	s->matched_line = 0;
4947 	return NULL;
4948 }
4949 
4950 static const struct got_error *
4951 search_next_blame_view(struct tog_view *view)
4952 {
4953 	struct tog_blame_view_state *s = &view->state.blame;
4954 	const struct got_error *err = NULL;
4955 	int lineno;
4956 	char *line = NULL;
4957 	size_t linesize = 0;
4958 	ssize_t linelen;
4959 
4960 	if (!view->searching) {
4961 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4962 		return NULL;
4963 	}
4964 
4965 	if (s->matched_line) {
4966 		if (view->searching == TOG_SEARCH_FORWARD)
4967 			lineno = s->matched_line + 1;
4968 		else
4969 			lineno = s->matched_line - 1;
4970 	} else
4971 		lineno = s->first_displayed_line - 1 + s->selected_line;
4972 
4973 	while (1) {
4974 		off_t offset;
4975 
4976 		if (lineno <= 0 || lineno > s->blame.nlines) {
4977 			if (s->matched_line == 0) {
4978 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4979 				break;
4980 			}
4981 
4982 			if (view->searching == TOG_SEARCH_FORWARD)
4983 				lineno = 1;
4984 			else
4985 				lineno = s->blame.nlines;
4986 		}
4987 
4988 		offset = s->blame.line_offsets[lineno - 1];
4989 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
4990 			free(line);
4991 			return got_error_from_errno("fseeko");
4992 		}
4993 		linelen = getline(&line, &linesize, s->blame.f);
4994 		if (linelen != -1) {
4995 			char *exstr;
4996 			err = expand_tab(&exstr, line);
4997 			if (err)
4998 				break;
4999 			if (match_line(exstr, &view->regex, 1,
5000 			    &view->regmatch)) {
5001 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5002 				s->matched_line = lineno;
5003 				free(exstr);
5004 				break;
5005 			}
5006 			free(exstr);
5007 		}
5008 		if (view->searching == TOG_SEARCH_FORWARD)
5009 			lineno++;
5010 		else
5011 			lineno--;
5012 	}
5013 	free(line);
5014 
5015 	if (s->matched_line) {
5016 		s->first_displayed_line = s->matched_line;
5017 		s->selected_line = 1;
5018 	}
5019 
5020 	return err;
5021 }
5022 
5023 static const struct got_error *
5024 show_blame_view(struct tog_view *view)
5025 {
5026 	const struct got_error *err = NULL;
5027 	struct tog_blame_view_state *s = &view->state.blame;
5028 	int errcode;
5029 
5030 	if (s->blame.thread == NULL && !s->blame_complete) {
5031 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5032 		    &s->blame.thread_args);
5033 		if (errcode)
5034 			return got_error_set_errno(errcode, "pthread_create");
5035 
5036 		halfdelay(1); /* fast refresh while annotating  */
5037 	}
5038 
5039 	if (s->blame_complete)
5040 		halfdelay(10); /* disable fast refresh */
5041 
5042 	err = draw_blame(view);
5043 
5044 	view_vborder(view);
5045 	return err;
5046 }
5047 
5048 static const struct got_error *
5049 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5050 {
5051 	const struct got_error *err = NULL, *thread_err = NULL;
5052 	struct tog_view *diff_view;
5053 	struct tog_blame_view_state *s = &view->state.blame;
5054 	int begin_x = 0, nscroll = view->nlines - 2;
5055 
5056 	switch (ch) {
5057 	case '0':
5058 		view->x = 0;
5059 		break;
5060 	case '$':
5061 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5062 		view->count = 0;
5063 		break;
5064 	case KEY_RIGHT:
5065 	case 'l':
5066 		if (view->x + view->ncols / 3 < view->maxx)
5067 			view->x += 2;  /* move two columns right */
5068 		else
5069 			view->count = 0;
5070 		break;
5071 	case KEY_LEFT:
5072 	case 'h':
5073 		view->x -= MIN(view->x, 2);  /* move two columns back */
5074 		if (view->x <= 0)
5075 			view->count = 0;
5076 		break;
5077 	case 'q':
5078 		s->done = 1;
5079 		break;
5080 	case 'g':
5081 	case KEY_HOME:
5082 		s->selected_line = 1;
5083 		s->first_displayed_line = 1;
5084 		view->count = 0;
5085 		break;
5086 	case 'G':
5087 	case KEY_END:
5088 		if (s->blame.nlines < view->nlines - 2) {
5089 			s->selected_line = s->blame.nlines;
5090 			s->first_displayed_line = 1;
5091 		} else {
5092 			s->selected_line = view->nlines - 2;
5093 			s->first_displayed_line = s->blame.nlines -
5094 			    (view->nlines - 3);
5095 		}
5096 		view->count = 0;
5097 		break;
5098 	case 'k':
5099 	case KEY_UP:
5100 	case CTRL('p'):
5101 		if (s->selected_line > 1)
5102 			s->selected_line--;
5103 		else if (s->selected_line == 1 &&
5104 		    s->first_displayed_line > 1)
5105 			s->first_displayed_line--;
5106 		else
5107 			view->count = 0;
5108 		break;
5109 	case CTRL('u'):
5110 	case 'u':
5111 		nscroll /= 2;
5112 		/* FALL THROUGH */
5113 	case KEY_PPAGE:
5114 	case CTRL('b'):
5115 	case 'b':
5116 		if (s->first_displayed_line == 1) {
5117 			if (view->count > 1)
5118 				nscroll += nscroll;
5119 			s->selected_line = MAX(1, s->selected_line - nscroll);
5120 			view->count = 0;
5121 			break;
5122 		}
5123 		if (s->first_displayed_line > nscroll)
5124 			s->first_displayed_line -= nscroll;
5125 		else
5126 			s->first_displayed_line = 1;
5127 		break;
5128 	case 'j':
5129 	case KEY_DOWN:
5130 	case CTRL('n'):
5131 		if (s->selected_line < view->nlines - 2 &&
5132 		    s->first_displayed_line +
5133 		    s->selected_line <= s->blame.nlines)
5134 			s->selected_line++;
5135 		else if (s->last_displayed_line <
5136 		    s->blame.nlines)
5137 			s->first_displayed_line++;
5138 		else
5139 			view->count = 0;
5140 		break;
5141 	case 'c':
5142 	case 'p': {
5143 		struct got_object_id *id = NULL;
5144 
5145 		view->count = 0;
5146 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5147 		    s->first_displayed_line, s->selected_line);
5148 		if (id == NULL)
5149 			break;
5150 		if (ch == 'p') {
5151 			struct got_commit_object *commit, *pcommit;
5152 			struct got_object_qid *pid;
5153 			struct got_object_id *blob_id = NULL;
5154 			int obj_type;
5155 			err = got_object_open_as_commit(&commit,
5156 			    s->repo, id);
5157 			if (err)
5158 				break;
5159 			pid = STAILQ_FIRST(
5160 			    got_object_commit_get_parent_ids(commit));
5161 			if (pid == NULL) {
5162 				got_object_commit_close(commit);
5163 				break;
5164 			}
5165 			/* Check if path history ends here. */
5166 			err = got_object_open_as_commit(&pcommit,
5167 			    s->repo, &pid->id);
5168 			if (err)
5169 				break;
5170 			err = got_object_id_by_path(&blob_id, s->repo,
5171 			    pcommit, s->path);
5172 			got_object_commit_close(pcommit);
5173 			if (err) {
5174 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5175 					err = NULL;
5176 				got_object_commit_close(commit);
5177 				break;
5178 			}
5179 			err = got_object_get_type(&obj_type, s->repo,
5180 			    blob_id);
5181 			free(blob_id);
5182 			/* Can't blame non-blob type objects. */
5183 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5184 				got_object_commit_close(commit);
5185 				break;
5186 			}
5187 			err = got_object_qid_alloc(&s->blamed_commit,
5188 			    &pid->id);
5189 			got_object_commit_close(commit);
5190 		} else {
5191 			if (got_object_id_cmp(id,
5192 			    &s->blamed_commit->id) == 0)
5193 				break;
5194 			err = got_object_qid_alloc(&s->blamed_commit,
5195 			    id);
5196 		}
5197 		if (err)
5198 			break;
5199 		s->done = 1;
5200 		thread_err = stop_blame(&s->blame);
5201 		s->done = 0;
5202 		if (thread_err)
5203 			break;
5204 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5205 		    s->blamed_commit, entry);
5206 		err = run_blame(view);
5207 		if (err)
5208 			break;
5209 		break;
5210 	}
5211 	case 'C': {
5212 		struct got_object_qid *first;
5213 
5214 		view->count = 0;
5215 		first = STAILQ_FIRST(&s->blamed_commits);
5216 		if (!got_object_id_cmp(&first->id, s->commit_id))
5217 			break;
5218 		s->done = 1;
5219 		thread_err = stop_blame(&s->blame);
5220 		s->done = 0;
5221 		if (thread_err)
5222 			break;
5223 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5224 		got_object_qid_free(s->blamed_commit);
5225 		s->blamed_commit =
5226 		    STAILQ_FIRST(&s->blamed_commits);
5227 		err = run_blame(view);
5228 		if (err)
5229 			break;
5230 		break;
5231 	}
5232 	case KEY_ENTER:
5233 	case '\r': {
5234 		struct got_object_id *id = NULL;
5235 		struct got_object_qid *pid;
5236 		struct got_commit_object *commit = NULL;
5237 
5238 		view->count = 0;
5239 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5240 		    s->first_displayed_line, s->selected_line);
5241 		if (id == NULL)
5242 			break;
5243 		err = got_object_open_as_commit(&commit, s->repo, id);
5244 		if (err)
5245 			break;
5246 		pid = STAILQ_FIRST(
5247 		    got_object_commit_get_parent_ids(commit));
5248 		if (view_is_parent_view(view))
5249 		    begin_x = view_split_begin_x(view->begin_x);
5250 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
5251 		if (diff_view == NULL) {
5252 			got_object_commit_close(commit);
5253 			err = got_error_from_errno("view_open");
5254 			break;
5255 		}
5256 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5257 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
5258 		got_object_commit_close(commit);
5259 		if (err) {
5260 			view_close(diff_view);
5261 			break;
5262 		}
5263 		view->focussed = 0;
5264 		diff_view->focussed = 1;
5265 		if (view_is_parent_view(view)) {
5266 			err = view_close_child(view);
5267 			if (err)
5268 				break;
5269 			err = view_set_child(view, diff_view);
5270 			if (err)
5271 				break;
5272 			view->focus_child = 1;
5273 		} else
5274 			*new_view = diff_view;
5275 		if (err)
5276 			break;
5277 		break;
5278 	}
5279 	case CTRL('d'):
5280 	case 'd':
5281 		nscroll /= 2;
5282 		/* FALL THROUGH */
5283 	case KEY_NPAGE:
5284 	case CTRL('f'):
5285 	case 'f':
5286 	case ' ':
5287 		if (s->last_displayed_line >= s->blame.nlines &&
5288 		    s->selected_line >= MIN(s->blame.nlines,
5289 		    view->nlines - 2)) {
5290 			view->count = 0;
5291 			break;
5292 		}
5293 		if (s->last_displayed_line >= s->blame.nlines &&
5294 		    s->selected_line < view->nlines - 2) {
5295 			s->selected_line +=
5296 			    MIN(nscroll, s->last_displayed_line -
5297 			    s->first_displayed_line - s->selected_line + 1);
5298 		}
5299 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5300 			s->first_displayed_line += nscroll;
5301 		else
5302 			s->first_displayed_line =
5303 			    s->blame.nlines - (view->nlines - 3);
5304 		break;
5305 	case KEY_RESIZE:
5306 		if (s->selected_line > view->nlines - 2) {
5307 			s->selected_line = MIN(s->blame.nlines,
5308 			    view->nlines - 2);
5309 		}
5310 		break;
5311 	default:
5312 		view->count = 0;
5313 		break;
5314 	}
5315 	return thread_err ? thread_err : err;
5316 }
5317 
5318 static const struct got_error *
5319 cmd_blame(int argc, char *argv[])
5320 {
5321 	const struct got_error *error;
5322 	struct got_repository *repo = NULL;
5323 	struct got_worktree *worktree = NULL;
5324 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5325 	char *link_target = NULL;
5326 	struct got_object_id *commit_id = NULL;
5327 	struct got_commit_object *commit = NULL;
5328 	char *commit_id_str = NULL;
5329 	int ch;
5330 	struct tog_view *view;
5331 	int *pack_fds = NULL;
5332 
5333 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5334 		switch (ch) {
5335 		case 'c':
5336 			commit_id_str = optarg;
5337 			break;
5338 		case 'r':
5339 			repo_path = realpath(optarg, NULL);
5340 			if (repo_path == NULL)
5341 				return got_error_from_errno2("realpath",
5342 				    optarg);
5343 			break;
5344 		default:
5345 			usage_blame();
5346 			/* NOTREACHED */
5347 		}
5348 	}
5349 
5350 	argc -= optind;
5351 	argv += optind;
5352 
5353 	if (argc != 1)
5354 		usage_blame();
5355 
5356 	error = got_repo_pack_fds_open(&pack_fds);
5357 	if (error != NULL)
5358 		goto done;
5359 
5360 	if (repo_path == NULL) {
5361 		cwd = getcwd(NULL, 0);
5362 		if (cwd == NULL)
5363 			return got_error_from_errno("getcwd");
5364 		error = got_worktree_open(&worktree, cwd);
5365 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5366 			goto done;
5367 		if (worktree)
5368 			repo_path =
5369 			    strdup(got_worktree_get_repo_path(worktree));
5370 		else
5371 			repo_path = strdup(cwd);
5372 		if (repo_path == NULL) {
5373 			error = got_error_from_errno("strdup");
5374 			goto done;
5375 		}
5376 	}
5377 
5378 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5379 	if (error != NULL)
5380 		goto done;
5381 
5382 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
5383 	    worktree);
5384 	if (error)
5385 		goto done;
5386 
5387 	init_curses();
5388 
5389 	error = apply_unveil(got_repo_get_path(repo), NULL);
5390 	if (error)
5391 		goto done;
5392 
5393 	error = tog_load_refs(repo, 0);
5394 	if (error)
5395 		goto done;
5396 
5397 	if (commit_id_str == NULL) {
5398 		struct got_reference *head_ref;
5399 		error = got_ref_open(&head_ref, repo, worktree ?
5400 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
5401 		if (error != NULL)
5402 			goto done;
5403 		error = got_ref_resolve(&commit_id, repo, head_ref);
5404 		got_ref_close(head_ref);
5405 	} else {
5406 		error = got_repo_match_object_id(&commit_id, NULL,
5407 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5408 	}
5409 	if (error != NULL)
5410 		goto done;
5411 
5412 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
5413 	if (view == NULL) {
5414 		error = got_error_from_errno("view_open");
5415 		goto done;
5416 	}
5417 
5418 	error = got_object_open_as_commit(&commit, repo, commit_id);
5419 	if (error)
5420 		goto done;
5421 
5422 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
5423 	    commit, repo);
5424 	if (error)
5425 		goto done;
5426 
5427 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
5428 	    commit_id, repo);
5429 	if (error)
5430 		goto done;
5431 	if (worktree) {
5432 		/* Release work tree lock. */
5433 		got_worktree_close(worktree);
5434 		worktree = NULL;
5435 	}
5436 	error = view_loop(view);
5437 done:
5438 	free(repo_path);
5439 	free(in_repo_path);
5440 	free(link_target);
5441 	free(cwd);
5442 	free(commit_id);
5443 	if (commit)
5444 		got_object_commit_close(commit);
5445 	if (worktree)
5446 		got_worktree_close(worktree);
5447 	if (repo) {
5448 		const struct got_error *close_err = got_repo_close(repo);
5449 		if (error == NULL)
5450 			error = close_err;
5451 	}
5452 	if (pack_fds) {
5453 		const struct got_error *pack_err =
5454 		    got_repo_pack_fds_close(pack_fds);
5455 		if (error == NULL)
5456 			error = pack_err;
5457 	}
5458 	tog_free_refs();
5459 	return error;
5460 }
5461 
5462 static const struct got_error *
5463 draw_tree_entries(struct tog_view *view, const char *parent_path)
5464 {
5465 	struct tog_tree_view_state *s = &view->state.tree;
5466 	const struct got_error *err = NULL;
5467 	struct got_tree_entry *te;
5468 	wchar_t *wline;
5469 	struct tog_color *tc;
5470 	int width, n, i, nentries;
5471 	int limit = view->nlines;
5472 
5473 	s->ndisplayed = 0;
5474 
5475 	werase(view->window);
5476 
5477 	if (limit == 0)
5478 		return NULL;
5479 
5480 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
5481 	    0, 0);
5482 	if (err)
5483 		return err;
5484 	if (view_needs_focus_indication(view))
5485 		wstandout(view->window);
5486 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5487 	if (tc)
5488 		wattr_on(view->window,
5489 		    COLOR_PAIR(tc->colorpair), NULL);
5490 	waddwstr(view->window, wline);
5491 	if (tc)
5492 		wattr_off(view->window,
5493 		    COLOR_PAIR(tc->colorpair), NULL);
5494 	if (view_needs_focus_indication(view))
5495 		wstandend(view->window);
5496 	free(wline);
5497 	wline = NULL;
5498 	if (width < view->ncols - 1)
5499 		waddch(view->window, '\n');
5500 	if (--limit <= 0)
5501 		return NULL;
5502 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
5503 	    0, 0);
5504 	if (err)
5505 		return err;
5506 	waddwstr(view->window, wline);
5507 	free(wline);
5508 	wline = NULL;
5509 	if (width < view->ncols - 1)
5510 		waddch(view->window, '\n');
5511 	if (--limit <= 0)
5512 		return NULL;
5513 	waddch(view->window, '\n');
5514 	if (--limit <= 0)
5515 		return NULL;
5516 
5517 	if (s->first_displayed_entry == NULL) {
5518 		te = got_object_tree_get_first_entry(s->tree);
5519 		if (s->selected == 0) {
5520 			if (view->focussed)
5521 				wstandout(view->window);
5522 			s->selected_entry = NULL;
5523 		}
5524 		waddstr(view->window, "  ..\n");	/* parent directory */
5525 		if (s->selected == 0 && view->focussed)
5526 			wstandend(view->window);
5527 		s->ndisplayed++;
5528 		if (--limit <= 0)
5529 			return NULL;
5530 		n = 1;
5531 	} else {
5532 		n = 0;
5533 		te = s->first_displayed_entry;
5534 	}
5535 
5536 	nentries = got_object_tree_get_nentries(s->tree);
5537 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
5538 		char *line = NULL, *id_str = NULL, *link_target = NULL;
5539 		const char *modestr = "";
5540 		mode_t mode;
5541 
5542 		te = got_object_tree_get_entry(s->tree, i);
5543 		mode = got_tree_entry_get_mode(te);
5544 
5545 		if (s->show_ids) {
5546 			err = got_object_id_str(&id_str,
5547 			    got_tree_entry_get_id(te));
5548 			if (err)
5549 				return got_error_from_errno(
5550 				    "got_object_id_str");
5551 		}
5552 		if (got_object_tree_entry_is_submodule(te))
5553 			modestr = "$";
5554 		else if (S_ISLNK(mode)) {
5555 			int i;
5556 
5557 			err = got_tree_entry_get_symlink_target(&link_target,
5558 			    te, s->repo);
5559 			if (err) {
5560 				free(id_str);
5561 				return err;
5562 			}
5563 			for (i = 0; i < strlen(link_target); i++) {
5564 				if (!isprint((unsigned char)link_target[i]))
5565 					link_target[i] = '?';
5566 			}
5567 			modestr = "@";
5568 		}
5569 		else if (S_ISDIR(mode))
5570 			modestr = "/";
5571 		else if (mode & S_IXUSR)
5572 			modestr = "*";
5573 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
5574 		    got_tree_entry_get_name(te), modestr,
5575 		    link_target ? " -> ": "",
5576 		    link_target ? link_target : "") == -1) {
5577 			free(id_str);
5578 			free(link_target);
5579 			return got_error_from_errno("asprintf");
5580 		}
5581 		free(id_str);
5582 		free(link_target);
5583 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
5584 		    0, 0);
5585 		if (err) {
5586 			free(line);
5587 			break;
5588 		}
5589 		if (n == s->selected) {
5590 			if (view->focussed)
5591 				wstandout(view->window);
5592 			s->selected_entry = te;
5593 		}
5594 		tc = match_color(&s->colors, line);
5595 		if (tc)
5596 			wattr_on(view->window,
5597 			    COLOR_PAIR(tc->colorpair), NULL);
5598 		waddwstr(view->window, wline);
5599 		if (tc)
5600 			wattr_off(view->window,
5601 			    COLOR_PAIR(tc->colorpair), NULL);
5602 		if (width < view->ncols - 1)
5603 			waddch(view->window, '\n');
5604 		if (n == s->selected && view->focussed)
5605 			wstandend(view->window);
5606 		free(line);
5607 		free(wline);
5608 		wline = NULL;
5609 		n++;
5610 		s->ndisplayed++;
5611 		s->last_displayed_entry = te;
5612 		if (--limit <= 0)
5613 			break;
5614 	}
5615 
5616 	return err;
5617 }
5618 
5619 static void
5620 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
5621 {
5622 	struct got_tree_entry *te;
5623 	int isroot = s->tree == s->root;
5624 	int i = 0;
5625 
5626 	if (s->first_displayed_entry == NULL)
5627 		return;
5628 
5629 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
5630 	while (i++ < maxscroll) {
5631 		if (te == NULL) {
5632 			if (!isroot)
5633 				s->first_displayed_entry = NULL;
5634 			break;
5635 		}
5636 		s->first_displayed_entry = te;
5637 		te = got_tree_entry_get_prev(s->tree, te);
5638 	}
5639 }
5640 
5641 static void
5642 tree_scroll_down(struct tog_tree_view_state *s, int maxscroll)
5643 {
5644 	struct got_tree_entry *next, *last;
5645 	int n = 0;
5646 
5647 	if (s->first_displayed_entry)
5648 		next = got_tree_entry_get_next(s->tree,
5649 		    s->first_displayed_entry);
5650 	else
5651 		next = got_object_tree_get_first_entry(s->tree);
5652 
5653 	last = s->last_displayed_entry;
5654 	while (next && last && n++ < maxscroll) {
5655 		last = got_tree_entry_get_next(s->tree, last);
5656 		if (last) {
5657 			s->first_displayed_entry = next;
5658 			next = got_tree_entry_get_next(s->tree, next);
5659 		}
5660 	}
5661 }
5662 
5663 static const struct got_error *
5664 tree_entry_path(char **path, struct tog_parent_trees *parents,
5665     struct got_tree_entry *te)
5666 {
5667 	const struct got_error *err = NULL;
5668 	struct tog_parent_tree *pt;
5669 	size_t len = 2; /* for leading slash and NUL */
5670 
5671 	TAILQ_FOREACH(pt, parents, entry)
5672 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
5673 		    + 1 /* slash */;
5674 	if (te)
5675 		len += strlen(got_tree_entry_get_name(te));
5676 
5677 	*path = calloc(1, len);
5678 	if (path == NULL)
5679 		return got_error_from_errno("calloc");
5680 
5681 	(*path)[0] = '/';
5682 	pt = TAILQ_LAST(parents, tog_parent_trees);
5683 	while (pt) {
5684 		const char *name = got_tree_entry_get_name(pt->selected_entry);
5685 		if (strlcat(*path, name, len) >= len) {
5686 			err = got_error(GOT_ERR_NO_SPACE);
5687 			goto done;
5688 		}
5689 		if (strlcat(*path, "/", len) >= len) {
5690 			err = got_error(GOT_ERR_NO_SPACE);
5691 			goto done;
5692 		}
5693 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
5694 	}
5695 	if (te) {
5696 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
5697 			err = got_error(GOT_ERR_NO_SPACE);
5698 			goto done;
5699 		}
5700 	}
5701 done:
5702 	if (err) {
5703 		free(*path);
5704 		*path = NULL;
5705 	}
5706 	return err;
5707 }
5708 
5709 static const struct got_error *
5710 blame_tree_entry(struct tog_view **new_view, int begin_x,
5711     struct got_tree_entry *te, struct tog_parent_trees *parents,
5712     struct got_object_id *commit_id, struct got_repository *repo)
5713 {
5714 	const struct got_error *err = NULL;
5715 	char *path;
5716 	struct tog_view *blame_view;
5717 
5718 	*new_view = NULL;
5719 
5720 	err = tree_entry_path(&path, parents, te);
5721 	if (err)
5722 		return err;
5723 
5724 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
5725 	if (blame_view == NULL) {
5726 		err = got_error_from_errno("view_open");
5727 		goto done;
5728 	}
5729 
5730 	err = open_blame_view(blame_view, path, commit_id, repo);
5731 	if (err) {
5732 		if (err->code == GOT_ERR_CANCELLED)
5733 			err = NULL;
5734 		view_close(blame_view);
5735 	} else
5736 		*new_view = blame_view;
5737 done:
5738 	free(path);
5739 	return err;
5740 }
5741 
5742 static const struct got_error *
5743 log_selected_tree_entry(struct tog_view **new_view, int begin_x,
5744     struct tog_tree_view_state *s)
5745 {
5746 	struct tog_view *log_view;
5747 	const struct got_error *err = NULL;
5748 	char *path;
5749 
5750 	*new_view = NULL;
5751 
5752 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
5753 	if (log_view == NULL)
5754 		return got_error_from_errno("view_open");
5755 
5756 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
5757 	if (err)
5758 		return err;
5759 
5760 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
5761 	    path, 0);
5762 	if (err)
5763 		view_close(log_view);
5764 	else
5765 		*new_view = log_view;
5766 	free(path);
5767 	return err;
5768 }
5769 
5770 static const struct got_error *
5771 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
5772     const char *head_ref_name, struct got_repository *repo)
5773 {
5774 	const struct got_error *err = NULL;
5775 	char *commit_id_str = NULL;
5776 	struct tog_tree_view_state *s = &view->state.tree;
5777 	struct got_commit_object *commit = NULL;
5778 
5779 	TAILQ_INIT(&s->parents);
5780 	STAILQ_INIT(&s->colors);
5781 
5782 	s->commit_id = got_object_id_dup(commit_id);
5783 	if (s->commit_id == NULL)
5784 		return got_error_from_errno("got_object_id_dup");
5785 
5786 	err = got_object_open_as_commit(&commit, repo, commit_id);
5787 	if (err)
5788 		goto done;
5789 
5790 	/*
5791 	 * The root is opened here and will be closed when the view is closed.
5792 	 * Any visited subtrees and their path-wise parents are opened and
5793 	 * closed on demand.
5794 	 */
5795 	err = got_object_open_as_tree(&s->root, repo,
5796 	    got_object_commit_get_tree_id(commit));
5797 	if (err)
5798 		goto done;
5799 	s->tree = s->root;
5800 
5801 	err = got_object_id_str(&commit_id_str, commit_id);
5802 	if (err != NULL)
5803 		goto done;
5804 
5805 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
5806 		err = got_error_from_errno("asprintf");
5807 		goto done;
5808 	}
5809 
5810 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
5811 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
5812 	if (head_ref_name) {
5813 		s->head_ref_name = strdup(head_ref_name);
5814 		if (s->head_ref_name == NULL) {
5815 			err = got_error_from_errno("strdup");
5816 			goto done;
5817 		}
5818 	}
5819 	s->repo = repo;
5820 
5821 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5822 		err = add_color(&s->colors, "\\$$",
5823 		    TOG_COLOR_TREE_SUBMODULE,
5824 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
5825 		if (err)
5826 			goto done;
5827 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
5828 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
5829 		if (err)
5830 			goto done;
5831 		err = add_color(&s->colors, "/$",
5832 		    TOG_COLOR_TREE_DIRECTORY,
5833 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
5834 		if (err)
5835 			goto done;
5836 
5837 		err = add_color(&s->colors, "\\*$",
5838 		    TOG_COLOR_TREE_EXECUTABLE,
5839 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
5840 		if (err)
5841 			goto done;
5842 
5843 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
5844 		    get_color_value("TOG_COLOR_COMMIT"));
5845 		if (err)
5846 			goto done;
5847 	}
5848 
5849 	view->show = show_tree_view;
5850 	view->input = input_tree_view;
5851 	view->close = close_tree_view;
5852 	view->search_start = search_start_tree_view;
5853 	view->search_next = search_next_tree_view;
5854 done:
5855 	free(commit_id_str);
5856 	if (commit)
5857 		got_object_commit_close(commit);
5858 	if (err)
5859 		close_tree_view(view);
5860 	return err;
5861 }
5862 
5863 static const struct got_error *
5864 close_tree_view(struct tog_view *view)
5865 {
5866 	struct tog_tree_view_state *s = &view->state.tree;
5867 
5868 	free_colors(&s->colors);
5869 	free(s->tree_label);
5870 	s->tree_label = NULL;
5871 	free(s->commit_id);
5872 	s->commit_id = NULL;
5873 	free(s->head_ref_name);
5874 	s->head_ref_name = NULL;
5875 	while (!TAILQ_EMPTY(&s->parents)) {
5876 		struct tog_parent_tree *parent;
5877 		parent = TAILQ_FIRST(&s->parents);
5878 		TAILQ_REMOVE(&s->parents, parent, entry);
5879 		if (parent->tree != s->root)
5880 			got_object_tree_close(parent->tree);
5881 		free(parent);
5882 
5883 	}
5884 	if (s->tree != NULL && s->tree != s->root)
5885 		got_object_tree_close(s->tree);
5886 	if (s->root)
5887 		got_object_tree_close(s->root);
5888 	return NULL;
5889 }
5890 
5891 static const struct got_error *
5892 search_start_tree_view(struct tog_view *view)
5893 {
5894 	struct tog_tree_view_state *s = &view->state.tree;
5895 
5896 	s->matched_entry = NULL;
5897 	return NULL;
5898 }
5899 
5900 static int
5901 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
5902 {
5903 	regmatch_t regmatch;
5904 
5905 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
5906 	    0) == 0;
5907 }
5908 
5909 static const struct got_error *
5910 search_next_tree_view(struct tog_view *view)
5911 {
5912 	struct tog_tree_view_state *s = &view->state.tree;
5913 	struct got_tree_entry *te = NULL;
5914 
5915 	if (!view->searching) {
5916 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5917 		return NULL;
5918 	}
5919 
5920 	if (s->matched_entry) {
5921 		if (view->searching == TOG_SEARCH_FORWARD) {
5922 			if (s->selected_entry)
5923 				te = got_tree_entry_get_next(s->tree,
5924 				    s->selected_entry);
5925 			else
5926 				te = got_object_tree_get_first_entry(s->tree);
5927 		} else {
5928 			if (s->selected_entry == NULL)
5929 				te = got_object_tree_get_last_entry(s->tree);
5930 			else
5931 				te = got_tree_entry_get_prev(s->tree,
5932 				    s->selected_entry);
5933 		}
5934 	} else {
5935 		if (s->selected_entry)
5936 			te = s->selected_entry;
5937 		else if (view->searching == TOG_SEARCH_FORWARD)
5938 			te = got_object_tree_get_first_entry(s->tree);
5939 		else
5940 			te = got_object_tree_get_last_entry(s->tree);
5941 	}
5942 
5943 	while (1) {
5944 		if (te == NULL) {
5945 			if (s->matched_entry == NULL) {
5946 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5947 				return NULL;
5948 			}
5949 			if (view->searching == TOG_SEARCH_FORWARD)
5950 				te = got_object_tree_get_first_entry(s->tree);
5951 			else
5952 				te = got_object_tree_get_last_entry(s->tree);
5953 		}
5954 
5955 		if (match_tree_entry(te, &view->regex)) {
5956 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
5957 			s->matched_entry = te;
5958 			break;
5959 		}
5960 
5961 		if (view->searching == TOG_SEARCH_FORWARD)
5962 			te = got_tree_entry_get_next(s->tree, te);
5963 		else
5964 			te = got_tree_entry_get_prev(s->tree, te);
5965 	}
5966 
5967 	if (s->matched_entry) {
5968 		s->first_displayed_entry = s->matched_entry;
5969 		s->selected = 0;
5970 	}
5971 
5972 	return NULL;
5973 }
5974 
5975 static const struct got_error *
5976 show_tree_view(struct tog_view *view)
5977 {
5978 	const struct got_error *err = NULL;
5979 	struct tog_tree_view_state *s = &view->state.tree;
5980 	char *parent_path;
5981 
5982 	err = tree_entry_path(&parent_path, &s->parents, NULL);
5983 	if (err)
5984 		return err;
5985 
5986 	err = draw_tree_entries(view, parent_path);
5987 	free(parent_path);
5988 
5989 	view_vborder(view);
5990 	return err;
5991 }
5992 
5993 static const struct got_error *
5994 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
5995 {
5996 	const struct got_error *err = NULL;
5997 	struct tog_tree_view_state *s = &view->state.tree;
5998 	struct tog_view *log_view, *ref_view;
5999 	struct got_tree_entry *te;
6000 	int begin_x = 0, n, nscroll = view->nlines - 3;
6001 
6002 	switch (ch) {
6003 	case 'i':
6004 		s->show_ids = !s->show_ids;
6005 		view->count = 0;
6006 		break;
6007 	case 'l':
6008 		view->count = 0;
6009 		if (!s->selected_entry)
6010 			break;
6011 		if (view_is_parent_view(view))
6012 			begin_x = view_split_begin_x(view->begin_x);
6013 		err = log_selected_tree_entry(&log_view, begin_x, s);
6014 		view->focussed = 0;
6015 		log_view->focussed = 1;
6016 		if (view_is_parent_view(view)) {
6017 			err = view_close_child(view);
6018 			if (err)
6019 				return err;
6020 			err = view_set_child(view, log_view);
6021 			if (err)
6022 				return err;
6023 			view->focus_child = 1;
6024 		} else
6025 			*new_view = log_view;
6026 		break;
6027 	case 'r':
6028 		view->count = 0;
6029 		if (view_is_parent_view(view))
6030 			begin_x = view_split_begin_x(view->begin_x);
6031 		ref_view = view_open(view->nlines, view->ncols,
6032 		    view->begin_y, begin_x, TOG_VIEW_REF);
6033 		if (ref_view == NULL)
6034 			return got_error_from_errno("view_open");
6035 		err = open_ref_view(ref_view, s->repo);
6036 		if (err) {
6037 			view_close(ref_view);
6038 			return err;
6039 		}
6040 		view->focussed = 0;
6041 		ref_view->focussed = 1;
6042 		if (view_is_parent_view(view)) {
6043 			err = view_close_child(view);
6044 			if (err)
6045 				return err;
6046 			err = view_set_child(view, ref_view);
6047 			if (err)
6048 				return err;
6049 			view->focus_child = 1;
6050 		} else
6051 			*new_view = ref_view;
6052 		break;
6053 	case 'g':
6054 	case KEY_HOME:
6055 		s->selected = 0;
6056 		view->count = 0;
6057 		if (s->tree == s->root)
6058 			s->first_displayed_entry =
6059 			    got_object_tree_get_first_entry(s->tree);
6060 		else
6061 			s->first_displayed_entry = NULL;
6062 		break;
6063 	case 'G':
6064 	case KEY_END:
6065 		s->selected = 0;
6066 		view->count = 0;
6067 		te = got_object_tree_get_last_entry(s->tree);
6068 		for (n = 0; n < view->nlines - 3; n++) {
6069 			if (te == NULL) {
6070 				if(s->tree != s->root) {
6071 					s->first_displayed_entry = NULL;
6072 					n++;
6073 				}
6074 				break;
6075 			}
6076 			s->first_displayed_entry = te;
6077 			te = got_tree_entry_get_prev(s->tree, te);
6078 		}
6079 		if (n > 0)
6080 			s->selected = n - 1;
6081 		break;
6082 	case 'k':
6083 	case KEY_UP:
6084 	case CTRL('p'):
6085 		if (s->selected > 0) {
6086 			s->selected--;
6087 			break;
6088 		}
6089 		tree_scroll_up(s, 1);
6090 		if (s->selected_entry == NULL ||
6091 		    (s->tree == s->root && s->selected_entry ==
6092 		     got_object_tree_get_first_entry(s->tree)))
6093 			view->count = 0;
6094 		break;
6095 	case CTRL('u'):
6096 	case 'u':
6097 		nscroll /= 2;
6098 		/* FALL THROUGH */
6099 	case KEY_PPAGE:
6100 	case CTRL('b'):
6101 	case 'b':
6102 		if (s->tree == s->root) {
6103 			if (got_object_tree_get_first_entry(s->tree) ==
6104 			    s->first_displayed_entry)
6105 				s->selected -= MIN(s->selected, nscroll);
6106 		} else {
6107 			if (s->first_displayed_entry == NULL)
6108 				s->selected -= MIN(s->selected, nscroll);
6109 		}
6110 		tree_scroll_up(s, MAX(0, nscroll));
6111 		if (s->selected_entry == NULL ||
6112 		    (s->tree == s->root && s->selected_entry ==
6113 		     got_object_tree_get_first_entry(s->tree)))
6114 			view->count = 0;
6115 		break;
6116 	case 'j':
6117 	case KEY_DOWN:
6118 	case CTRL('n'):
6119 		if (s->selected < s->ndisplayed - 1) {
6120 			s->selected++;
6121 			break;
6122 		}
6123 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6124 		    == NULL) {
6125 			/* can't scroll any further */
6126 			view->count = 0;
6127 			break;
6128 		}
6129 		tree_scroll_down(s, 1);
6130 		break;
6131 	case CTRL('d'):
6132 	case 'd':
6133 		nscroll /= 2;
6134 		/* FALL THROUGH */
6135 	case KEY_NPAGE:
6136 	case CTRL('f'):
6137 	case 'f':
6138 	case ' ':
6139 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6140 		    == NULL) {
6141 			/* can't scroll any further; move cursor down */
6142 			if (s->selected < s->ndisplayed - 1)
6143 				s->selected += MIN(nscroll,
6144 				    s->ndisplayed - s->selected - 1);
6145 			else
6146 				view->count = 0;
6147 			break;
6148 		}
6149 		tree_scroll_down(s, nscroll);
6150 		break;
6151 	case KEY_ENTER:
6152 	case '\r':
6153 	case KEY_BACKSPACE:
6154 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6155 			struct tog_parent_tree *parent;
6156 			/* user selected '..' */
6157 			if (s->tree == s->root) {
6158 				view->count = 0;
6159 				break;
6160 			}
6161 			parent = TAILQ_FIRST(&s->parents);
6162 			TAILQ_REMOVE(&s->parents, parent,
6163 			    entry);
6164 			got_object_tree_close(s->tree);
6165 			s->tree = parent->tree;
6166 			s->first_displayed_entry =
6167 			    parent->first_displayed_entry;
6168 			s->selected_entry =
6169 			    parent->selected_entry;
6170 			s->selected = parent->selected;
6171 			free(parent);
6172 		} else if (S_ISDIR(got_tree_entry_get_mode(
6173 		    s->selected_entry))) {
6174 			struct got_tree_object *subtree;
6175 			view->count = 0;
6176 			err = got_object_open_as_tree(&subtree, s->repo,
6177 			    got_tree_entry_get_id(s->selected_entry));
6178 			if (err)
6179 				break;
6180 			err = tree_view_visit_subtree(s, subtree);
6181 			if (err) {
6182 				got_object_tree_close(subtree);
6183 				break;
6184 			}
6185 		} else if (S_ISREG(got_tree_entry_get_mode(
6186 		    s->selected_entry))) {
6187 			struct tog_view *blame_view;
6188 			int begin_x = view_is_parent_view(view) ?
6189 			    view_split_begin_x(view->begin_x) : 0;
6190 
6191 			err = blame_tree_entry(&blame_view, begin_x,
6192 			    s->selected_entry, &s->parents,
6193 			    s->commit_id, s->repo);
6194 			if (err)
6195 				break;
6196 			view->count = 0;
6197 			view->focussed = 0;
6198 			blame_view->focussed = 1;
6199 			if (view_is_parent_view(view)) {
6200 				err = view_close_child(view);
6201 				if (err)
6202 					return err;
6203 				err = view_set_child(view, blame_view);
6204 				if (err)
6205 					return err;
6206 				view->focus_child = 1;
6207 			} else
6208 				*new_view = blame_view;
6209 		}
6210 		break;
6211 	case KEY_RESIZE:
6212 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6213 			s->selected = view->nlines - 4;
6214 		view->count = 0;
6215 		break;
6216 	default:
6217 		view->count = 0;
6218 		break;
6219 	}
6220 
6221 	return err;
6222 }
6223 
6224 __dead static void
6225 usage_tree(void)
6226 {
6227 	endwin();
6228 	fprintf(stderr,
6229 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6230 	    getprogname());
6231 	exit(1);
6232 }
6233 
6234 static const struct got_error *
6235 cmd_tree(int argc, char *argv[])
6236 {
6237 	const struct got_error *error;
6238 	struct got_repository *repo = NULL;
6239 	struct got_worktree *worktree = NULL;
6240 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6241 	struct got_object_id *commit_id = NULL;
6242 	struct got_commit_object *commit = NULL;
6243 	const char *commit_id_arg = NULL;
6244 	char *label = NULL;
6245 	struct got_reference *ref = NULL;
6246 	const char *head_ref_name = NULL;
6247 	int ch;
6248 	struct tog_view *view;
6249 	int *pack_fds = NULL;
6250 
6251 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6252 		switch (ch) {
6253 		case 'c':
6254 			commit_id_arg = optarg;
6255 			break;
6256 		case 'r':
6257 			repo_path = realpath(optarg, NULL);
6258 			if (repo_path == NULL)
6259 				return got_error_from_errno2("realpath",
6260 				    optarg);
6261 			break;
6262 		default:
6263 			usage_tree();
6264 			/* NOTREACHED */
6265 		}
6266 	}
6267 
6268 	argc -= optind;
6269 	argv += optind;
6270 
6271 	if (argc > 1)
6272 		usage_tree();
6273 
6274 	error = got_repo_pack_fds_open(&pack_fds);
6275 	if (error != NULL)
6276 		goto done;
6277 
6278 	if (repo_path == NULL) {
6279 		cwd = getcwd(NULL, 0);
6280 		if (cwd == NULL)
6281 			return got_error_from_errno("getcwd");
6282 		error = got_worktree_open(&worktree, cwd);
6283 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6284 			goto done;
6285 		if (worktree)
6286 			repo_path =
6287 			    strdup(got_worktree_get_repo_path(worktree));
6288 		else
6289 			repo_path = strdup(cwd);
6290 		if (repo_path == NULL) {
6291 			error = got_error_from_errno("strdup");
6292 			goto done;
6293 		}
6294 	}
6295 
6296 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6297 	if (error != NULL)
6298 		goto done;
6299 
6300 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6301 	    repo, worktree);
6302 	if (error)
6303 		goto done;
6304 
6305 	init_curses();
6306 
6307 	error = apply_unveil(got_repo_get_path(repo), NULL);
6308 	if (error)
6309 		goto done;
6310 
6311 	error = tog_load_refs(repo, 0);
6312 	if (error)
6313 		goto done;
6314 
6315 	if (commit_id_arg == NULL) {
6316 		error = got_repo_match_object_id(&commit_id, &label,
6317 		    worktree ? got_worktree_get_head_ref_name(worktree) :
6318 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6319 		if (error)
6320 			goto done;
6321 		head_ref_name = label;
6322 	} else {
6323 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
6324 		if (error == NULL)
6325 			head_ref_name = got_ref_get_name(ref);
6326 		else if (error->code != GOT_ERR_NOT_REF)
6327 			goto done;
6328 		error = got_repo_match_object_id(&commit_id, NULL,
6329 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6330 		if (error)
6331 			goto done;
6332 	}
6333 
6334 	error = got_object_open_as_commit(&commit, repo, commit_id);
6335 	if (error)
6336 		goto done;
6337 
6338 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
6339 	if (view == NULL) {
6340 		error = got_error_from_errno("view_open");
6341 		goto done;
6342 	}
6343 	error = open_tree_view(view, commit_id, head_ref_name, repo);
6344 	if (error)
6345 		goto done;
6346 	if (!got_path_is_root_dir(in_repo_path)) {
6347 		error = tree_view_walk_path(&view->state.tree, commit,
6348 		    in_repo_path);
6349 		if (error)
6350 			goto done;
6351 	}
6352 
6353 	if (worktree) {
6354 		/* Release work tree lock. */
6355 		got_worktree_close(worktree);
6356 		worktree = NULL;
6357 	}
6358 	error = view_loop(view);
6359 done:
6360 	free(repo_path);
6361 	free(cwd);
6362 	free(commit_id);
6363 	free(label);
6364 	if (ref)
6365 		got_ref_close(ref);
6366 	if (repo) {
6367 		const struct got_error *close_err = got_repo_close(repo);
6368 		if (error == NULL)
6369 			error = close_err;
6370 	}
6371 	if (pack_fds) {
6372 		const struct got_error *pack_err =
6373 		    got_repo_pack_fds_close(pack_fds);
6374 		if (error == NULL)
6375 			error = pack_err;
6376 	}
6377 	tog_free_refs();
6378 	return error;
6379 }
6380 
6381 static const struct got_error *
6382 ref_view_load_refs(struct tog_ref_view_state *s)
6383 {
6384 	struct got_reflist_entry *sre;
6385 	struct tog_reflist_entry *re;
6386 
6387 	s->nrefs = 0;
6388 	TAILQ_FOREACH(sre, &tog_refs, entry) {
6389 		if (strncmp(got_ref_get_name(sre->ref),
6390 		    "refs/got/", 9) == 0 &&
6391 		    strncmp(got_ref_get_name(sre->ref),
6392 		    "refs/got/backup/", 16) != 0)
6393 			continue;
6394 
6395 		re = malloc(sizeof(*re));
6396 		if (re == NULL)
6397 			return got_error_from_errno("malloc");
6398 
6399 		re->ref = got_ref_dup(sre->ref);
6400 		if (re->ref == NULL)
6401 			return got_error_from_errno("got_ref_dup");
6402 		re->idx = s->nrefs++;
6403 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
6404 	}
6405 
6406 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6407 	return NULL;
6408 }
6409 
6410 void
6411 ref_view_free_refs(struct tog_ref_view_state *s)
6412 {
6413 	struct tog_reflist_entry *re;
6414 
6415 	while (!TAILQ_EMPTY(&s->refs)) {
6416 		re = TAILQ_FIRST(&s->refs);
6417 		TAILQ_REMOVE(&s->refs, re, entry);
6418 		got_ref_close(re->ref);
6419 		free(re);
6420 	}
6421 }
6422 
6423 static const struct got_error *
6424 open_ref_view(struct tog_view *view, struct got_repository *repo)
6425 {
6426 	const struct got_error *err = NULL;
6427 	struct tog_ref_view_state *s = &view->state.ref;
6428 
6429 	s->selected_entry = 0;
6430 	s->repo = repo;
6431 
6432 	TAILQ_INIT(&s->refs);
6433 	STAILQ_INIT(&s->colors);
6434 
6435 	err = ref_view_load_refs(s);
6436 	if (err)
6437 		return err;
6438 
6439 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6440 		err = add_color(&s->colors, "^refs/heads/",
6441 		    TOG_COLOR_REFS_HEADS,
6442 		    get_color_value("TOG_COLOR_REFS_HEADS"));
6443 		if (err)
6444 			goto done;
6445 
6446 		err = add_color(&s->colors, "^refs/tags/",
6447 		    TOG_COLOR_REFS_TAGS,
6448 		    get_color_value("TOG_COLOR_REFS_TAGS"));
6449 		if (err)
6450 			goto done;
6451 
6452 		err = add_color(&s->colors, "^refs/remotes/",
6453 		    TOG_COLOR_REFS_REMOTES,
6454 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
6455 		if (err)
6456 			goto done;
6457 
6458 		err = add_color(&s->colors, "^refs/got/backup/",
6459 		    TOG_COLOR_REFS_BACKUP,
6460 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
6461 		if (err)
6462 			goto done;
6463 	}
6464 
6465 	view->show = show_ref_view;
6466 	view->input = input_ref_view;
6467 	view->close = close_ref_view;
6468 	view->search_start = search_start_ref_view;
6469 	view->search_next = search_next_ref_view;
6470 done:
6471 	if (err)
6472 		free_colors(&s->colors);
6473 	return err;
6474 }
6475 
6476 static const struct got_error *
6477 close_ref_view(struct tog_view *view)
6478 {
6479 	struct tog_ref_view_state *s = &view->state.ref;
6480 
6481 	ref_view_free_refs(s);
6482 	free_colors(&s->colors);
6483 
6484 	return NULL;
6485 }
6486 
6487 static const struct got_error *
6488 resolve_reflist_entry(struct got_object_id **commit_id,
6489     struct tog_reflist_entry *re, struct got_repository *repo)
6490 {
6491 	const struct got_error *err = NULL;
6492 	struct got_object_id *obj_id;
6493 	struct got_tag_object *tag = NULL;
6494 	int obj_type;
6495 
6496 	*commit_id = NULL;
6497 
6498 	err = got_ref_resolve(&obj_id, repo, re->ref);
6499 	if (err)
6500 		return err;
6501 
6502 	err = got_object_get_type(&obj_type, repo, obj_id);
6503 	if (err)
6504 		goto done;
6505 
6506 	switch (obj_type) {
6507 	case GOT_OBJ_TYPE_COMMIT:
6508 		*commit_id = obj_id;
6509 		break;
6510 	case GOT_OBJ_TYPE_TAG:
6511 		err = got_object_open_as_tag(&tag, repo, obj_id);
6512 		if (err)
6513 			goto done;
6514 		free(obj_id);
6515 		err = got_object_get_type(&obj_type, repo,
6516 		    got_object_tag_get_object_id(tag));
6517 		if (err)
6518 			goto done;
6519 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
6520 			err = got_error(GOT_ERR_OBJ_TYPE);
6521 			goto done;
6522 		}
6523 		*commit_id = got_object_id_dup(
6524 		    got_object_tag_get_object_id(tag));
6525 		if (*commit_id == NULL) {
6526 			err = got_error_from_errno("got_object_id_dup");
6527 			goto done;
6528 		}
6529 		break;
6530 	default:
6531 		err = got_error(GOT_ERR_OBJ_TYPE);
6532 		break;
6533 	}
6534 
6535 done:
6536 	if (tag)
6537 		got_object_tag_close(tag);
6538 	if (err) {
6539 		free(*commit_id);
6540 		*commit_id = NULL;
6541 	}
6542 	return err;
6543 }
6544 
6545 static const struct got_error *
6546 log_ref_entry(struct tog_view **new_view, int begin_x,
6547     struct tog_reflist_entry *re, struct got_repository *repo)
6548 {
6549 	struct tog_view *log_view;
6550 	const struct got_error *err = NULL;
6551 	struct got_object_id *commit_id = NULL;
6552 
6553 	*new_view = NULL;
6554 
6555 	err = resolve_reflist_entry(&commit_id, re, repo);
6556 	if (err) {
6557 		if (err->code != GOT_ERR_OBJ_TYPE)
6558 			return err;
6559 		else
6560 			return NULL;
6561 	}
6562 
6563 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
6564 	if (log_view == NULL) {
6565 		err = got_error_from_errno("view_open");
6566 		goto done;
6567 	}
6568 
6569 	err = open_log_view(log_view, commit_id, repo,
6570 	    got_ref_get_name(re->ref), "", 0);
6571 done:
6572 	if (err)
6573 		view_close(log_view);
6574 	else
6575 		*new_view = log_view;
6576 	free(commit_id);
6577 	return err;
6578 }
6579 
6580 static void
6581 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
6582 {
6583 	struct tog_reflist_entry *re;
6584 	int i = 0;
6585 
6586 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6587 		return;
6588 
6589 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
6590 	while (i++ < maxscroll) {
6591 		if (re == NULL)
6592 			break;
6593 		s->first_displayed_entry = re;
6594 		re = TAILQ_PREV(re, tog_reflist_head, entry);
6595 	}
6596 }
6597 
6598 static void
6599 ref_scroll_down(struct tog_ref_view_state *s, int maxscroll)
6600 {
6601 	struct tog_reflist_entry *next, *last;
6602 	int n = 0;
6603 
6604 	if (s->first_displayed_entry)
6605 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
6606 	else
6607 		next = TAILQ_FIRST(&s->refs);
6608 
6609 	last = s->last_displayed_entry;
6610 	while (next && last && n++ < maxscroll) {
6611 		last = TAILQ_NEXT(last, entry);
6612 		if (last) {
6613 			s->first_displayed_entry = next;
6614 			next = TAILQ_NEXT(next, entry);
6615 		}
6616 	}
6617 }
6618 
6619 static const struct got_error *
6620 search_start_ref_view(struct tog_view *view)
6621 {
6622 	struct tog_ref_view_state *s = &view->state.ref;
6623 
6624 	s->matched_entry = NULL;
6625 	return NULL;
6626 }
6627 
6628 static int
6629 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
6630 {
6631 	regmatch_t regmatch;
6632 
6633 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
6634 	    0) == 0;
6635 }
6636 
6637 static const struct got_error *
6638 search_next_ref_view(struct tog_view *view)
6639 {
6640 	struct tog_ref_view_state *s = &view->state.ref;
6641 	struct tog_reflist_entry *re = NULL;
6642 
6643 	if (!view->searching) {
6644 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6645 		return NULL;
6646 	}
6647 
6648 	if (s->matched_entry) {
6649 		if (view->searching == TOG_SEARCH_FORWARD) {
6650 			if (s->selected_entry)
6651 				re = TAILQ_NEXT(s->selected_entry, entry);
6652 			else
6653 				re = TAILQ_PREV(s->selected_entry,
6654 				    tog_reflist_head, entry);
6655 		} else {
6656 			if (s->selected_entry == NULL)
6657 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6658 			else
6659 				re = TAILQ_PREV(s->selected_entry,
6660 				    tog_reflist_head, entry);
6661 		}
6662 	} else {
6663 		if (s->selected_entry)
6664 			re = s->selected_entry;
6665 		else if (view->searching == TOG_SEARCH_FORWARD)
6666 			re = TAILQ_FIRST(&s->refs);
6667 		else
6668 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
6669 	}
6670 
6671 	while (1) {
6672 		if (re == NULL) {
6673 			if (s->matched_entry == NULL) {
6674 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6675 				return NULL;
6676 			}
6677 			if (view->searching == TOG_SEARCH_FORWARD)
6678 				re = TAILQ_FIRST(&s->refs);
6679 			else
6680 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
6681 		}
6682 
6683 		if (match_reflist_entry(re, &view->regex)) {
6684 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6685 			s->matched_entry = re;
6686 			break;
6687 		}
6688 
6689 		if (view->searching == TOG_SEARCH_FORWARD)
6690 			re = TAILQ_NEXT(re, entry);
6691 		else
6692 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6693 	}
6694 
6695 	if (s->matched_entry) {
6696 		s->first_displayed_entry = s->matched_entry;
6697 		s->selected = 0;
6698 	}
6699 
6700 	return NULL;
6701 }
6702 
6703 static const struct got_error *
6704 show_ref_view(struct tog_view *view)
6705 {
6706 	const struct got_error *err = NULL;
6707 	struct tog_ref_view_state *s = &view->state.ref;
6708 	struct tog_reflist_entry *re;
6709 	char *line = NULL;
6710 	wchar_t *wline;
6711 	struct tog_color *tc;
6712 	int width, n;
6713 	int limit = view->nlines;
6714 
6715 	werase(view->window);
6716 
6717 	s->ndisplayed = 0;
6718 
6719 	if (limit == 0)
6720 		return NULL;
6721 
6722 	re = s->first_displayed_entry;
6723 
6724 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
6725 	    s->nrefs) == -1)
6726 		return got_error_from_errno("asprintf");
6727 
6728 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6729 	if (err) {
6730 		free(line);
6731 		return err;
6732 	}
6733 	if (view_needs_focus_indication(view))
6734 		wstandout(view->window);
6735 	waddwstr(view->window, wline);
6736 	if (view_needs_focus_indication(view))
6737 		wstandend(view->window);
6738 	free(wline);
6739 	wline = NULL;
6740 	free(line);
6741 	line = NULL;
6742 	if (width < view->ncols - 1)
6743 		waddch(view->window, '\n');
6744 	if (--limit <= 0)
6745 		return NULL;
6746 
6747 	n = 0;
6748 	while (re && limit > 0) {
6749 		char *line = NULL;
6750 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
6751 
6752 		if (s->show_date) {
6753 			struct got_commit_object *ci;
6754 			struct got_tag_object *tag;
6755 			struct got_object_id *id;
6756 			struct tm tm;
6757 			time_t t;
6758 
6759 			err = got_ref_resolve(&id, s->repo, re->ref);
6760 			if (err)
6761 				return err;
6762 			err = got_object_open_as_tag(&tag, s->repo, id);
6763 			if (err) {
6764 				if (err->code != GOT_ERR_OBJ_TYPE) {
6765 					free(id);
6766 					return err;
6767 				}
6768 				err = got_object_open_as_commit(&ci, s->repo,
6769 				    id);
6770 				if (err) {
6771 					free(id);
6772 					return err;
6773 				}
6774 				t = got_object_commit_get_committer_time(ci);
6775 				got_object_commit_close(ci);
6776 			} else {
6777 				t = got_object_tag_get_tagger_time(tag);
6778 				got_object_tag_close(tag);
6779 			}
6780 			free(id);
6781 			if (gmtime_r(&t, &tm) == NULL)
6782 				return got_error_from_errno("gmtime_r");
6783 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
6784 				return got_error(GOT_ERR_NO_SPACE);
6785 		}
6786 		if (got_ref_is_symbolic(re->ref)) {
6787 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
6788 			    ymd : "", got_ref_get_name(re->ref),
6789 			    got_ref_get_symref_target(re->ref)) == -1)
6790 				return got_error_from_errno("asprintf");
6791 		} else if (s->show_ids) {
6792 			struct got_object_id *id;
6793 			char *id_str;
6794 			err = got_ref_resolve(&id, s->repo, re->ref);
6795 			if (err)
6796 				return err;
6797 			err = got_object_id_str(&id_str, id);
6798 			if (err) {
6799 				free(id);
6800 				return err;
6801 			}
6802 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
6803 			    got_ref_get_name(re->ref), id_str) == -1) {
6804 				err = got_error_from_errno("asprintf");
6805 				free(id);
6806 				free(id_str);
6807 				return err;
6808 			}
6809 			free(id);
6810 			free(id_str);
6811 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
6812 		    got_ref_get_name(re->ref)) == -1)
6813 			return got_error_from_errno("asprintf");
6814 
6815 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6816 		    0, 0);
6817 		if (err) {
6818 			free(line);
6819 			return err;
6820 		}
6821 		if (n == s->selected) {
6822 			if (view->focussed)
6823 				wstandout(view->window);
6824 			s->selected_entry = re;
6825 		}
6826 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
6827 		if (tc)
6828 			wattr_on(view->window,
6829 			    COLOR_PAIR(tc->colorpair), NULL);
6830 		waddwstr(view->window, wline);
6831 		if (tc)
6832 			wattr_off(view->window,
6833 			    COLOR_PAIR(tc->colorpair), NULL);
6834 		if (width < view->ncols - 1)
6835 			waddch(view->window, '\n');
6836 		if (n == s->selected && view->focussed)
6837 			wstandend(view->window);
6838 		free(line);
6839 		free(wline);
6840 		wline = NULL;
6841 		n++;
6842 		s->ndisplayed++;
6843 		s->last_displayed_entry = re;
6844 
6845 		limit--;
6846 		re = TAILQ_NEXT(re, entry);
6847 	}
6848 
6849 	view_vborder(view);
6850 	return err;
6851 }
6852 
6853 static const struct got_error *
6854 browse_ref_tree(struct tog_view **new_view, int begin_x,
6855     struct tog_reflist_entry *re, struct got_repository *repo)
6856 {
6857 	const struct got_error *err = NULL;
6858 	struct got_object_id *commit_id = NULL;
6859 	struct tog_view *tree_view;
6860 
6861 	*new_view = NULL;
6862 
6863 	err = resolve_reflist_entry(&commit_id, re, repo);
6864 	if (err) {
6865 		if (err->code != GOT_ERR_OBJ_TYPE)
6866 			return err;
6867 		else
6868 			return NULL;
6869 	}
6870 
6871 
6872 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
6873 	if (tree_view == NULL) {
6874 		err = got_error_from_errno("view_open");
6875 		goto done;
6876 	}
6877 
6878 	err = open_tree_view(tree_view, commit_id,
6879 	    got_ref_get_name(re->ref), repo);
6880 	if (err)
6881 		goto done;
6882 
6883 	*new_view = tree_view;
6884 done:
6885 	free(commit_id);
6886 	return err;
6887 }
6888 static const struct got_error *
6889 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
6890 {
6891 	const struct got_error *err = NULL;
6892 	struct tog_ref_view_state *s = &view->state.ref;
6893 	struct tog_view *log_view, *tree_view;
6894 	struct tog_reflist_entry *re;
6895 	int begin_x = 0, n, nscroll = view->nlines - 1;
6896 
6897 	switch (ch) {
6898 	case 'i':
6899 		s->show_ids = !s->show_ids;
6900 		view->count = 0;
6901 		break;
6902 	case 'm':
6903 		s->show_date = !s->show_date;
6904 		view->count = 0;
6905 		break;
6906 	case 'o':
6907 		s->sort_by_date = !s->sort_by_date;
6908 		view->count = 0;
6909 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
6910 		    got_ref_cmp_by_commit_timestamp_descending :
6911 		    tog_ref_cmp_by_name, s->repo);
6912 		if (err)
6913 			break;
6914 		got_reflist_object_id_map_free(tog_refs_idmap);
6915 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
6916 		    &tog_refs, s->repo);
6917 		if (err)
6918 			break;
6919 		ref_view_free_refs(s);
6920 		err = ref_view_load_refs(s);
6921 		break;
6922 	case KEY_ENTER:
6923 	case '\r':
6924 		view->count = 0;
6925 		if (!s->selected_entry)
6926 			break;
6927 		if (view_is_parent_view(view))
6928 			begin_x = view_split_begin_x(view->begin_x);
6929 		err = log_ref_entry(&log_view, begin_x, s->selected_entry,
6930 		    s->repo);
6931 		view->focussed = 0;
6932 		log_view->focussed = 1;
6933 		if (view_is_parent_view(view)) {
6934 			err = view_close_child(view);
6935 			if (err)
6936 				return err;
6937 			err = view_set_child(view, log_view);
6938 			if (err)
6939 				return err;
6940 			view->focus_child = 1;
6941 		} else
6942 			*new_view = log_view;
6943 		break;
6944 	case 't':
6945 		view->count = 0;
6946 		if (!s->selected_entry)
6947 			break;
6948 		if (view_is_parent_view(view))
6949 			begin_x = view_split_begin_x(view->begin_x);
6950 		err = browse_ref_tree(&tree_view, begin_x, s->selected_entry,
6951 		    s->repo);
6952 		if (err || tree_view == NULL)
6953 			break;
6954 		view->focussed = 0;
6955 		tree_view->focussed = 1;
6956 		if (view_is_parent_view(view)) {
6957 			err = view_close_child(view);
6958 			if (err)
6959 				return err;
6960 			err = view_set_child(view, tree_view);
6961 			if (err)
6962 				return err;
6963 			view->focus_child = 1;
6964 		} else
6965 			*new_view = tree_view;
6966 		break;
6967 	case 'g':
6968 	case KEY_HOME:
6969 		s->selected = 0;
6970 		view->count = 0;
6971 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6972 		break;
6973 	case 'G':
6974 	case KEY_END:
6975 		s->selected = 0;
6976 		view->count = 0;
6977 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
6978 		for (n = 0; n < view->nlines - 1; n++) {
6979 			if (re == NULL)
6980 				break;
6981 			s->first_displayed_entry = re;
6982 			re = TAILQ_PREV(re, tog_reflist_head, entry);
6983 		}
6984 		if (n > 0)
6985 			s->selected = n - 1;
6986 		break;
6987 	case 'k':
6988 	case KEY_UP:
6989 	case CTRL('p'):
6990 		if (s->selected > 0) {
6991 			s->selected--;
6992 			break;
6993 		}
6994 		ref_scroll_up(s, 1);
6995 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
6996 			view->count = 0;
6997 		break;
6998 	case CTRL('u'):
6999 	case 'u':
7000 		nscroll /= 2;
7001 		/* FALL THROUGH */
7002 	case KEY_PPAGE:
7003 	case CTRL('b'):
7004 	case 'b':
7005 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7006 			s->selected -= MIN(nscroll, s->selected);
7007 		ref_scroll_up(s, MAX(0, nscroll));
7008 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7009 			view->count = 0;
7010 		break;
7011 	case 'j':
7012 	case KEY_DOWN:
7013 	case CTRL('n'):
7014 		if (s->selected < s->ndisplayed - 1) {
7015 			s->selected++;
7016 			break;
7017 		}
7018 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7019 			/* can't scroll any further */
7020 			view->count = 0;
7021 			break;
7022 		}
7023 		ref_scroll_down(s, 1);
7024 		break;
7025 	case CTRL('d'):
7026 	case 'd':
7027 		nscroll /= 2;
7028 		/* FALL THROUGH */
7029 	case KEY_NPAGE:
7030 	case CTRL('f'):
7031 	case 'f':
7032 	case ' ':
7033 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7034 			/* can't scroll any further; move cursor down */
7035 			if (s->selected < s->ndisplayed - 1)
7036 				s->selected += MIN(nscroll,
7037 				    s->ndisplayed - s->selected - 1);
7038 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7039 				s->selected += s->ndisplayed - s->selected - 1;
7040 			view->count = 0;
7041 			break;
7042 		}
7043 		ref_scroll_down(s, nscroll);
7044 		break;
7045 	case CTRL('l'):
7046 		view->count = 0;
7047 		tog_free_refs();
7048 		err = tog_load_refs(s->repo, s->sort_by_date);
7049 		if (err)
7050 			break;
7051 		ref_view_free_refs(s);
7052 		err = ref_view_load_refs(s);
7053 		break;
7054 	case KEY_RESIZE:
7055 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7056 			s->selected = view->nlines - 2;
7057 		break;
7058 	default:
7059 		view->count = 0;
7060 		break;
7061 	}
7062 
7063 	return err;
7064 }
7065 
7066 __dead static void
7067 usage_ref(void)
7068 {
7069 	endwin();
7070 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7071 	    getprogname());
7072 	exit(1);
7073 }
7074 
7075 static const struct got_error *
7076 cmd_ref(int argc, char *argv[])
7077 {
7078 	const struct got_error *error;
7079 	struct got_repository *repo = NULL;
7080 	struct got_worktree *worktree = NULL;
7081 	char *cwd = NULL, *repo_path = NULL;
7082 	int ch;
7083 	struct tog_view *view;
7084 	int *pack_fds = NULL;
7085 
7086 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7087 		switch (ch) {
7088 		case 'r':
7089 			repo_path = realpath(optarg, NULL);
7090 			if (repo_path == NULL)
7091 				return got_error_from_errno2("realpath",
7092 				    optarg);
7093 			break;
7094 		default:
7095 			usage_ref();
7096 			/* NOTREACHED */
7097 		}
7098 	}
7099 
7100 	argc -= optind;
7101 	argv += optind;
7102 
7103 	if (argc > 1)
7104 		usage_ref();
7105 
7106 	error = got_repo_pack_fds_open(&pack_fds);
7107 	if (error != NULL)
7108 		goto done;
7109 
7110 	if (repo_path == NULL) {
7111 		cwd = getcwd(NULL, 0);
7112 		if (cwd == NULL)
7113 			return got_error_from_errno("getcwd");
7114 		error = got_worktree_open(&worktree, cwd);
7115 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7116 			goto done;
7117 		if (worktree)
7118 			repo_path =
7119 			    strdup(got_worktree_get_repo_path(worktree));
7120 		else
7121 			repo_path = strdup(cwd);
7122 		if (repo_path == NULL) {
7123 			error = got_error_from_errno("strdup");
7124 			goto done;
7125 		}
7126 	}
7127 
7128 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7129 	if (error != NULL)
7130 		goto done;
7131 
7132 	init_curses();
7133 
7134 	error = apply_unveil(got_repo_get_path(repo), NULL);
7135 	if (error)
7136 		goto done;
7137 
7138 	error = tog_load_refs(repo, 0);
7139 	if (error)
7140 		goto done;
7141 
7142 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7143 	if (view == NULL) {
7144 		error = got_error_from_errno("view_open");
7145 		goto done;
7146 	}
7147 
7148 	error = open_ref_view(view, repo);
7149 	if (error)
7150 		goto done;
7151 
7152 	if (worktree) {
7153 		/* Release work tree lock. */
7154 		got_worktree_close(worktree);
7155 		worktree = NULL;
7156 	}
7157 	error = view_loop(view);
7158 done:
7159 	free(repo_path);
7160 	free(cwd);
7161 	if (repo) {
7162 		const struct got_error *close_err = got_repo_close(repo);
7163 		if (close_err)
7164 			error = close_err;
7165 	}
7166 	if (pack_fds) {
7167 		const struct got_error *pack_err =
7168 		    got_repo_pack_fds_close(pack_fds);
7169 		if (error == NULL)
7170 			error = pack_err;
7171 	}
7172 	tog_free_refs();
7173 	return error;
7174 }
7175 
7176 static void
7177 list_commands(FILE *fp)
7178 {
7179 	size_t i;
7180 
7181 	fprintf(fp, "commands:");
7182 	for (i = 0; i < nitems(tog_commands); i++) {
7183 		const struct tog_cmd *cmd = &tog_commands[i];
7184 		fprintf(fp, " %s", cmd->name);
7185 	}
7186 	fputc('\n', fp);
7187 }
7188 
7189 __dead static void
7190 usage(int hflag, int status)
7191 {
7192 	FILE *fp = (status == 0) ? stdout : stderr;
7193 
7194 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
7195 	    getprogname());
7196 	if (hflag) {
7197 		fprintf(fp, "lazy usage: %s path\n", getprogname());
7198 		list_commands(fp);
7199 	}
7200 	exit(status);
7201 }
7202 
7203 static char **
7204 make_argv(int argc, ...)
7205 {
7206 	va_list ap;
7207 	char **argv;
7208 	int i;
7209 
7210 	va_start(ap, argc);
7211 
7212 	argv = calloc(argc, sizeof(char *));
7213 	if (argv == NULL)
7214 		err(1, "calloc");
7215 	for (i = 0; i < argc; i++) {
7216 		argv[i] = strdup(va_arg(ap, char *));
7217 		if (argv[i] == NULL)
7218 			err(1, "strdup");
7219 	}
7220 
7221 	va_end(ap);
7222 	return argv;
7223 }
7224 
7225 /*
7226  * Try to convert 'tog path' into a 'tog log path' command.
7227  * The user could simply have mistyped the command rather than knowingly
7228  * provided a path. So check whether argv[0] can in fact be resolved
7229  * to a path in the HEAD commit and print a special error if not.
7230  * This hack is for mpi@ <3
7231  */
7232 static const struct got_error *
7233 tog_log_with_path(int argc, char *argv[])
7234 {
7235 	const struct got_error *error = NULL, *close_err;
7236 	const struct tog_cmd *cmd = NULL;
7237 	struct got_repository *repo = NULL;
7238 	struct got_worktree *worktree = NULL;
7239 	struct got_object_id *commit_id = NULL, *id = NULL;
7240 	struct got_commit_object *commit = NULL;
7241 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7242 	char *commit_id_str = NULL, **cmd_argv = NULL;
7243 	int *pack_fds = NULL;
7244 
7245 	cwd = getcwd(NULL, 0);
7246 	if (cwd == NULL)
7247 		return got_error_from_errno("getcwd");
7248 
7249 	error = got_repo_pack_fds_open(&pack_fds);
7250 	if (error != NULL)
7251 		goto done;
7252 
7253 	error = got_worktree_open(&worktree, cwd);
7254 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
7255 		goto done;
7256 
7257 	if (worktree)
7258 		repo_path = strdup(got_worktree_get_repo_path(worktree));
7259 	else
7260 		repo_path = strdup(cwd);
7261 	if (repo_path == NULL) {
7262 		error = got_error_from_errno("strdup");
7263 		goto done;
7264 	}
7265 
7266 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7267 	if (error != NULL)
7268 		goto done;
7269 
7270 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7271 	    repo, worktree);
7272 	if (error)
7273 		goto done;
7274 
7275 	error = tog_load_refs(repo, 0);
7276 	if (error)
7277 		goto done;
7278 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
7279 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
7280 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7281 	if (error)
7282 		goto done;
7283 
7284 	if (worktree) {
7285 		got_worktree_close(worktree);
7286 		worktree = NULL;
7287 	}
7288 
7289 	error = got_object_open_as_commit(&commit, repo, commit_id);
7290 	if (error)
7291 		goto done;
7292 
7293 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
7294 	if (error) {
7295 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
7296 			goto done;
7297 		fprintf(stderr, "%s: '%s' is no known command or path\n",
7298 		    getprogname(), argv[0]);
7299 		usage(1, 1);
7300 		/* not reached */
7301 	}
7302 
7303 	close_err = got_repo_close(repo);
7304 	if (error == NULL)
7305 		error = close_err;
7306 	repo = NULL;
7307 
7308 	error = got_object_id_str(&commit_id_str, commit_id);
7309 	if (error)
7310 		goto done;
7311 
7312 	cmd = &tog_commands[0]; /* log */
7313 	argc = 4;
7314 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
7315 	error = cmd->cmd_main(argc, cmd_argv);
7316 done:
7317 	if (repo) {
7318 		close_err = got_repo_close(repo);
7319 		if (error == NULL)
7320 			error = close_err;
7321 	}
7322 	if (commit)
7323 		got_object_commit_close(commit);
7324 	if (worktree)
7325 		got_worktree_close(worktree);
7326 	if (pack_fds) {
7327 		const struct got_error *pack_err =
7328 		    got_repo_pack_fds_close(pack_fds);
7329 		if (error == NULL)
7330 			error = pack_err;
7331 	}
7332 	free(id);
7333 	free(commit_id_str);
7334 	free(commit_id);
7335 	free(cwd);
7336 	free(repo_path);
7337 	free(in_repo_path);
7338 	if (cmd_argv) {
7339 		int i;
7340 		for (i = 0; i < argc; i++)
7341 			free(cmd_argv[i]);
7342 		free(cmd_argv);
7343 	}
7344 	tog_free_refs();
7345 	return error;
7346 }
7347 
7348 int
7349 main(int argc, char *argv[])
7350 {
7351 	const struct got_error *error = NULL;
7352 	const struct tog_cmd *cmd = NULL;
7353 	int ch, hflag = 0, Vflag = 0;
7354 	char **cmd_argv = NULL;
7355 	static const struct option longopts[] = {
7356 	    { "version", no_argument, NULL, 'V' },
7357 	    { NULL, 0, NULL, 0}
7358 	};
7359 
7360 	setlocale(LC_CTYPE, "");
7361 
7362 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
7363 		switch (ch) {
7364 		case 'h':
7365 			hflag = 1;
7366 			break;
7367 		case 'V':
7368 			Vflag = 1;
7369 			break;
7370 		default:
7371 			usage(hflag, 1);
7372 			/* NOTREACHED */
7373 		}
7374 	}
7375 
7376 	argc -= optind;
7377 	argv += optind;
7378 	optind = 1;
7379 	optreset = 1;
7380 
7381 	if (Vflag) {
7382 		got_version_print_str();
7383 		return 0;
7384 	}
7385 
7386 #ifndef PROFILE
7387 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
7388 	    NULL) == -1)
7389 		err(1, "pledge");
7390 #endif
7391 
7392 	if (argc == 0) {
7393 		if (hflag)
7394 			usage(hflag, 0);
7395 		/* Build an argument vector which runs a default command. */
7396 		cmd = &tog_commands[0];
7397 		argc = 1;
7398 		cmd_argv = make_argv(argc, cmd->name);
7399 	} else {
7400 		size_t i;
7401 
7402 		/* Did the user specify a command? */
7403 		for (i = 0; i < nitems(tog_commands); i++) {
7404 			if (strncmp(tog_commands[i].name, argv[0],
7405 			    strlen(argv[0])) == 0) {
7406 				cmd = &tog_commands[i];
7407 				break;
7408 			}
7409 		}
7410 	}
7411 
7412 	if (cmd == NULL) {
7413 		if (argc != 1)
7414 			usage(0, 1);
7415 		/* No command specified; try log with a path */
7416 		error = tog_log_with_path(argc, argv);
7417 	} else {
7418 		if (hflag)
7419 			cmd->cmd_usage();
7420 		else
7421 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
7422 	}
7423 
7424 	endwin();
7425 	putchar('\n');
7426 	if (cmd_argv) {
7427 		int i;
7428 		for (i = 0; i < argc; i++)
7429 			free(cmd_argv[i]);
7430 		free(cmd_argv);
7431 	}
7432 
7433 	if (error && error->code != GOT_ERR_CANCELLED)
7434 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
7435 	return 0;
7436 }