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