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