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