1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
319 }
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int lineno;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct got_diff_line *lines;
335 	size_t nlines;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 };
365 
366 struct tog_log_view_state {
367 	struct commit_queue commits;
368 	struct commit_queue_entry *first_displayed_entry;
369 	struct commit_queue_entry *last_displayed_entry;
370 	struct commit_queue_entry *selected_entry;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 	int use_committer;
384 };
385 
386 #define TOG_COLOR_DIFF_MINUS		1
387 #define TOG_COLOR_DIFF_PLUS		2
388 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
389 #define TOG_COLOR_DIFF_META		4
390 #define TOG_COLOR_TREE_SUBMODULE	5
391 #define TOG_COLOR_TREE_SYMLINK		6
392 #define TOG_COLOR_TREE_DIRECTORY	7
393 #define TOG_COLOR_TREE_EXECUTABLE	8
394 #define TOG_COLOR_COMMIT		9
395 #define TOG_COLOR_AUTHOR		10
396 #define TOG_COLOR_DATE			11
397 #define TOG_COLOR_REFS_HEADS		12
398 #define TOG_COLOR_REFS_TAGS		13
399 #define TOG_COLOR_REFS_REMOTES		14
400 #define TOG_COLOR_REFS_BACKUP		15
401 
402 struct tog_blame_cb_args {
403 	struct tog_blame_line *lines; /* one per line */
404 	int nlines;
405 
406 	struct tog_view *view;
407 	struct got_object_id *commit_id;
408 	int *quit;
409 };
410 
411 struct tog_blame_thread_args {
412 	const char *path;
413 	struct got_repository *repo;
414 	struct tog_blame_cb_args *cb_args;
415 	int *complete;
416 	got_cancel_cb cancel_cb;
417 	void *cancel_arg;
418 };
419 
420 struct tog_blame {
421 	FILE *f;
422 	off_t filesize;
423 	struct tog_blame_line *lines;
424 	int nlines;
425 	off_t *line_offsets;
426 	pthread_t thread;
427 	struct tog_blame_thread_args thread_args;
428 	struct tog_blame_cb_args cb_args;
429 	const char *path;
430 	int *pack_fds;
431 };
432 
433 struct tog_blame_view_state {
434 	int first_displayed_line;
435 	int last_displayed_line;
436 	int selected_line;
437 	int last_diffed_line;
438 	int blame_complete;
439 	int eof;
440 	int done;
441 	struct got_object_id_queue blamed_commits;
442 	struct got_object_qid *blamed_commit;
443 	char *path;
444 	struct got_repository *repo;
445 	struct got_object_id *commit_id;
446 	struct got_object_id *id_to_log;
447 	struct tog_blame blame;
448 	int matched_line;
449 	struct tog_colors colors;
450 };
451 
452 struct tog_parent_tree {
453 	TAILQ_ENTRY(tog_parent_tree) entry;
454 	struct got_tree_object *tree;
455 	struct got_tree_entry *first_displayed_entry;
456 	struct got_tree_entry *selected_entry;
457 	int selected;
458 };
459 
460 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
461 
462 struct tog_tree_view_state {
463 	char *tree_label;
464 	struct got_object_id *commit_id;/* commit which this tree belongs to */
465 	struct got_tree_object *root;	/* the commit's root tree entry */
466 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
467 	struct got_tree_entry *first_displayed_entry;
468 	struct got_tree_entry *last_displayed_entry;
469 	struct got_tree_entry *selected_entry;
470 	int ndisplayed, selected, show_ids;
471 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
472 	char *head_ref_name;
473 	struct got_repository *repo;
474 	struct got_tree_entry *matched_entry;
475 	struct tog_colors colors;
476 };
477 
478 struct tog_reflist_entry {
479 	TAILQ_ENTRY(tog_reflist_entry) entry;
480 	struct got_reference *ref;
481 	int idx;
482 };
483 
484 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
485 
486 struct tog_ref_view_state {
487 	struct tog_reflist_head refs;
488 	struct tog_reflist_entry *first_displayed_entry;
489 	struct tog_reflist_entry *last_displayed_entry;
490 	struct tog_reflist_entry *selected_entry;
491 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
492 	struct got_repository *repo;
493 	struct tog_reflist_entry *matched_entry;
494 	struct tog_colors colors;
495 };
496 
497 /*
498  * We implement two types of views: parent views and child views.
499  *
500  * The 'Tab' key switches focus between a parent view and its child view.
501  * Child views are shown side-by-side to their parent view, provided
502  * there is enough screen estate.
503  *
504  * When a new view is opened from within a parent view, this new view
505  * becomes a child view of the parent view, replacing any existing child.
506  *
507  * When a new view is opened from within a child view, this new view
508  * becomes a parent view which will obscure the views below until the
509  * user quits the new parent view by typing 'q'.
510  *
511  * This list of views contains parent views only.
512  * Child views are only pointed to by their parent view.
513  */
514 TAILQ_HEAD(tog_view_list_head, tog_view);
515 
516 struct tog_view {
517 	TAILQ_ENTRY(tog_view) entry;
518 	WINDOW *window;
519 	PANEL *panel;
520 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
521 	int resized_y, resized_x; /* begin_y/x based on user resizing */
522 	int maxx, x; /* max column and current start column */
523 	int lines, cols; /* copies of LINES and COLS */
524 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
525 	int gline, hiline; /* navigate to and highlight this nG line */
526 	int ch, count; /* current keymap and count prefix */
527 	int resized; /* set when in a resize event */
528 	int focussed; /* Only set on one parent or child view at a time. */
529 	int dying;
530 	struct tog_view *parent;
531 	struct tog_view *child;
532 
533 	/*
534 	 * This flag is initially set on parent views when a new child view
535 	 * is created. It gets toggled when the 'Tab' key switches focus
536 	 * between parent and child.
537 	 * The flag indicates whether focus should be passed on to our child
538 	 * view if this parent view gets picked for focus after another parent
539 	 * view was closed. This prevents child views from losing focus in such
540 	 * situations.
541 	 */
542 	int focus_child;
543 
544 	enum tog_view_mode mode;
545 	/* type-specific state */
546 	enum tog_view_type type;
547 	union {
548 		struct tog_diff_view_state diff;
549 		struct tog_log_view_state log;
550 		struct tog_blame_view_state blame;
551 		struct tog_tree_view_state tree;
552 		struct tog_ref_view_state ref;
553 	} state;
554 
555 	const struct got_error *(*show)(struct tog_view *);
556 	const struct got_error *(*input)(struct tog_view **,
557 	    struct tog_view *, int);
558 	const struct got_error *(*reset)(struct tog_view *);
559 	const struct got_error *(*resize)(struct tog_view *, int);
560 	const struct got_error *(*close)(struct tog_view *);
561 
562 	const struct got_error *(*search_start)(struct tog_view *);
563 	const struct got_error *(*search_next)(struct tog_view *);
564 	int search_started;
565 	int searching;
566 #define TOG_SEARCH_FORWARD	1
567 #define TOG_SEARCH_BACKWARD	2
568 	int search_next_done;
569 #define TOG_SEARCH_HAVE_MORE	1
570 #define TOG_SEARCH_NO_MORE	2
571 #define TOG_SEARCH_HAVE_NONE	3
572 	regex_t regex;
573 	regmatch_t regmatch;
574 };
575 
576 static const struct got_error *open_diff_view(struct tog_view *,
577     struct got_object_id *, struct got_object_id *,
578     const char *, const char *, int, int, int, struct tog_view *,
579     struct got_repository *);
580 static const struct got_error *show_diff_view(struct tog_view *);
581 static const struct got_error *input_diff_view(struct tog_view **,
582     struct tog_view *, int);
583 static const struct got_error *reset_diff_view(struct tog_view *);
584 static const struct got_error* close_diff_view(struct tog_view *);
585 static const struct got_error *search_start_diff_view(struct tog_view *);
586 static const struct got_error *search_next_diff_view(struct tog_view *);
587 
588 static const struct got_error *open_log_view(struct tog_view *,
589     struct got_object_id *, struct got_repository *,
590     const char *, const char *, int);
591 static const struct got_error * show_log_view(struct tog_view *);
592 static const struct got_error *input_log_view(struct tog_view **,
593     struct tog_view *, int);
594 static const struct got_error *resize_log_view(struct tog_view *, int);
595 static const struct got_error *close_log_view(struct tog_view *);
596 static const struct got_error *search_start_log_view(struct tog_view *);
597 static const struct got_error *search_next_log_view(struct tog_view *);
598 
599 static const struct got_error *open_blame_view(struct tog_view *, char *,
600     struct got_object_id *, struct got_repository *);
601 static const struct got_error *show_blame_view(struct tog_view *);
602 static const struct got_error *input_blame_view(struct tog_view **,
603     struct tog_view *, int);
604 static const struct got_error *reset_blame_view(struct tog_view *);
605 static const struct got_error *close_blame_view(struct tog_view *);
606 static const struct got_error *search_start_blame_view(struct tog_view *);
607 static const struct got_error *search_next_blame_view(struct tog_view *);
608 
609 static const struct got_error *open_tree_view(struct tog_view *,
610     struct got_object_id *, const char *, struct got_repository *);
611 static const struct got_error *show_tree_view(struct tog_view *);
612 static const struct got_error *input_tree_view(struct tog_view **,
613     struct tog_view *, int);
614 static const struct got_error *close_tree_view(struct tog_view *);
615 static const struct got_error *search_start_tree_view(struct tog_view *);
616 static const struct got_error *search_next_tree_view(struct tog_view *);
617 
618 static const struct got_error *open_ref_view(struct tog_view *,
619     struct got_repository *);
620 static const struct got_error *show_ref_view(struct tog_view *);
621 static const struct got_error *input_ref_view(struct tog_view **,
622     struct tog_view *, int);
623 static const struct got_error *close_ref_view(struct tog_view *);
624 static const struct got_error *search_start_ref_view(struct tog_view *);
625 static const struct got_error *search_next_ref_view(struct tog_view *);
626 
627 static volatile sig_atomic_t tog_sigwinch_received;
628 static volatile sig_atomic_t tog_sigpipe_received;
629 static volatile sig_atomic_t tog_sigcont_received;
630 static volatile sig_atomic_t tog_sigint_received;
631 static volatile sig_atomic_t tog_sigterm_received;
632 
633 static void
634 tog_sigwinch(int signo)
635 {
636 	tog_sigwinch_received = 1;
637 }
638 
639 static void
640 tog_sigpipe(int signo)
641 {
642 	tog_sigpipe_received = 1;
643 }
644 
645 static void
646 tog_sigcont(int signo)
647 {
648 	tog_sigcont_received = 1;
649 }
650 
651 static void
652 tog_sigint(int signo)
653 {
654 	tog_sigint_received = 1;
655 }
656 
657 static void
658 tog_sigterm(int signo)
659 {
660 	tog_sigterm_received = 1;
661 }
662 
663 static int
664 tog_fatal_signal_received(void)
665 {
666 	return (tog_sigpipe_received ||
667 	    tog_sigint_received || tog_sigint_received);
668 }
669 
670 static const struct got_error *
671 view_close(struct tog_view *view)
672 {
673 	const struct got_error *err = NULL, *child_err = NULL;
674 
675 	if (view->child) {
676 		child_err = view_close(view->child);
677 		view->child = NULL;
678 	}
679 	if (view->close)
680 		err = view->close(view);
681 	if (view->panel)
682 		del_panel(view->panel);
683 	if (view->window)
684 		delwin(view->window);
685 	free(view);
686 	return err ? err : child_err;
687 }
688 
689 static struct tog_view *
690 view_open(int nlines, int ncols, int begin_y, int begin_x,
691     enum tog_view_type type)
692 {
693 	struct tog_view *view = calloc(1, sizeof(*view));
694 
695 	if (view == NULL)
696 		return NULL;
697 
698 	view->type = type;
699 	view->lines = LINES;
700 	view->cols = COLS;
701 	view->nlines = nlines ? nlines : LINES - begin_y;
702 	view->ncols = ncols ? ncols : COLS - begin_x;
703 	view->begin_y = begin_y;
704 	view->begin_x = begin_x;
705 	view->window = newwin(nlines, ncols, begin_y, begin_x);
706 	if (view->window == NULL) {
707 		view_close(view);
708 		return NULL;
709 	}
710 	view->panel = new_panel(view->window);
711 	if (view->panel == NULL ||
712 	    set_panel_userptr(view->panel, view) != OK) {
713 		view_close(view);
714 		return NULL;
715 	}
716 
717 	keypad(view->window, TRUE);
718 	return view;
719 }
720 
721 static int
722 view_split_begin_x(int begin_x)
723 {
724 	if (begin_x > 0 || COLS < 120)
725 		return 0;
726 	return (COLS - MAX(COLS / 2, 80));
727 }
728 
729 /* XXX Stub till we decide what to do. */
730 static int
731 view_split_begin_y(int lines)
732 {
733 	return lines * HSPLIT_SCALE;
734 }
735 
736 static const struct got_error *view_resize(struct tog_view *);
737 
738 static const struct got_error *
739 view_splitscreen(struct tog_view *view)
740 {
741 	const struct got_error *err = NULL;
742 
743 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
744 		if (view->resized_y && view->resized_y < view->lines)
745 			view->begin_y = view->resized_y;
746 		else
747 			view->begin_y = view_split_begin_y(view->nlines);
748 		view->begin_x = 0;
749 	} else if (!view->resized) {
750 		if (view->resized_x && view->resized_x < view->cols - 1 &&
751 		    view->cols > 119)
752 			view->begin_x = view->resized_x;
753 		else
754 			view->begin_x = view_split_begin_x(0);
755 		view->begin_y = 0;
756 	}
757 	view->nlines = LINES - view->begin_y;
758 	view->ncols = COLS - view->begin_x;
759 	view->lines = LINES;
760 	view->cols = COLS;
761 	err = view_resize(view);
762 	if (err)
763 		return err;
764 
765 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
766 		view->parent->nlines = view->begin_y;
767 
768 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
769 		return got_error_from_errno("mvwin");
770 
771 	return NULL;
772 }
773 
774 static const struct got_error *
775 view_fullscreen(struct tog_view *view)
776 {
777 	const struct got_error *err = NULL;
778 
779 	view->begin_x = 0;
780 	view->begin_y = view->resized ? view->begin_y : 0;
781 	view->nlines = view->resized ? view->nlines : LINES;
782 	view->ncols = COLS;
783 	view->lines = LINES;
784 	view->cols = COLS;
785 	err = view_resize(view);
786 	if (err)
787 		return err;
788 
789 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
790 		return got_error_from_errno("mvwin");
791 
792 	return NULL;
793 }
794 
795 static int
796 view_is_parent_view(struct tog_view *view)
797 {
798 	return view->parent == NULL;
799 }
800 
801 static int
802 view_is_splitscreen(struct tog_view *view)
803 {
804 	return view->begin_x > 0 || view->begin_y > 0;
805 }
806 
807 static int
808 view_is_fullscreen(struct tog_view *view)
809 {
810 	return view->nlines == LINES && view->ncols == COLS;
811 }
812 
813 static int
814 view_is_hsplit_top(struct tog_view *view)
815 {
816 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
817 	    view_is_splitscreen(view->child);
818 }
819 
820 static void
821 view_border(struct tog_view *view)
822 {
823 	PANEL *panel;
824 	const struct tog_view *view_above;
825 
826 	if (view->parent)
827 		return view_border(view->parent);
828 
829 	panel = panel_above(view->panel);
830 	if (panel == NULL)
831 		return;
832 
833 	view_above = panel_userptr(panel);
834 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
835 		mvwhline(view->window, view_above->begin_y - 1,
836 		    view->begin_x, got_locale_is_utf8() ?
837 		    ACS_HLINE : '-', view->ncols);
838 	else
839 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
840 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
841 }
842 
843 static const struct got_error *view_init_hsplit(struct tog_view *, int);
844 static const struct got_error *request_log_commits(struct tog_view *);
845 static const struct got_error *offset_selection_down(struct tog_view *);
846 static void offset_selection_up(struct tog_view *);
847 static void view_get_split(struct tog_view *, int *, int *);
848 
849 static const struct got_error *
850 view_resize(struct tog_view *view)
851 {
852 	const struct got_error	*err = NULL;
853 	int			 dif, nlines, ncols;
854 
855 	dif = LINES - view->lines;  /* line difference */
856 
857 	if (view->lines > LINES)
858 		nlines = view->nlines - (view->lines - LINES);
859 	else
860 		nlines = view->nlines + (LINES - view->lines);
861 	if (view->cols > COLS)
862 		ncols = view->ncols - (view->cols - COLS);
863 	else
864 		ncols = view->ncols + (COLS - view->cols);
865 
866 	if (view->child) {
867 		int hs = view->child->begin_y;
868 
869 		if (!view_is_fullscreen(view))
870 			view->child->begin_x = view_split_begin_x(view->begin_x);
871 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
872 		    view->child->begin_x == 0) {
873 			ncols = COLS;
874 
875 			view_fullscreen(view->child);
876 			if (view->child->focussed)
877 				show_panel(view->child->panel);
878 			else
879 				show_panel(view->panel);
880 		} else {
881 			ncols = view->child->begin_x;
882 
883 			view_splitscreen(view->child);
884 			show_panel(view->child->panel);
885 		}
886 		/*
887 		 * XXX This is ugly and needs to be moved into the above
888 		 * logic but "works" for now and my attempts at moving it
889 		 * break either 'tab' or 'F' key maps in horizontal splits.
890 		 */
891 		if (hs) {
892 			err = view_splitscreen(view->child);
893 			if (err)
894 				return err;
895 			if (dif < 0) { /* top split decreased */
896 				err = offset_selection_down(view);
897 				if (err)
898 					return err;
899 			}
900 			view_border(view);
901 			update_panels();
902 			doupdate();
903 			show_panel(view->child->panel);
904 			nlines = view->nlines;
905 		}
906 	} else if (view->parent == NULL)
907 		ncols = COLS;
908 
909 	if (view->resize && dif > 0) {
910 		err = view->resize(view, dif);
911 		if (err)
912 			return err;
913 	}
914 
915 	if (wresize(view->window, nlines, ncols) == ERR)
916 		return got_error_from_errno("wresize");
917 	if (replace_panel(view->panel, view->window) == ERR)
918 		return got_error_from_errno("replace_panel");
919 	wclear(view->window);
920 
921 	view->nlines = nlines;
922 	view->ncols = ncols;
923 	view->lines = LINES;
924 	view->cols = COLS;
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 resize_log_view(struct tog_view *view, int increase)
931 {
932 	struct tog_log_view_state	*s = &view->state.log;
933 	const struct got_error		*err = NULL;
934 	int				 n = 0;
935 
936 	if (s->selected_entry)
937 		n = s->selected_entry->idx + view->lines - s->selected;
938 
939 	/*
940 	 * Request commits to account for the increased
941 	 * height so we have enough to populate the view.
942 	 */
943 	if (s->commits.ncommits < n) {
944 		view->nscrolled = n - s->commits.ncommits + increase + 1;
945 		err = request_log_commits(view);
946 	}
947 
948 	return err;
949 }
950 
951 static void
952 view_adjust_offset(struct tog_view *view, int n)
953 {
954 	if (n == 0)
955 		return;
956 
957 	if (view->parent && view->parent->offset) {
958 		if (view->parent->offset + n >= 0)
959 			view->parent->offset += n;
960 		else
961 			view->parent->offset = 0;
962 	} else if (view->offset) {
963 		if (view->offset - n >= 0)
964 			view->offset -= n;
965 		else
966 			view->offset = 0;
967 	}
968 }
969 
970 static const struct got_error *
971 view_resize_split(struct tog_view *view, int resize)
972 {
973 	const struct got_error	*err = NULL;
974 	struct tog_view		*v = NULL;
975 
976 	if (view->parent)
977 		v = view->parent;
978 	else
979 		v = view;
980 
981 	if (!v->child || !view_is_splitscreen(v->child))
982 		return NULL;
983 
984 	v->resized = v->child->resized = resize;  /* lock for resize event */
985 
986 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
987 		if (v->child->resized_y)
988 			v->child->begin_y = v->child->resized_y;
989 		if (view->parent)
990 			v->child->begin_y -= resize;
991 		else
992 			v->child->begin_y += resize;
993 		if (v->child->begin_y < 3) {
994 			view->count = 0;
995 			v->child->begin_y = 3;
996 		} else if (v->child->begin_y > LINES - 1) {
997 			view->count = 0;
998 			v->child->begin_y = LINES - 1;
999 		}
1000 		v->ncols = COLS;
1001 		v->child->ncols = COLS;
1002 		view_adjust_offset(view, resize);
1003 		err = view_init_hsplit(v, v->child->begin_y);
1004 		if (err)
1005 			return err;
1006 		v->child->resized_y = v->child->begin_y;
1007 	} else {
1008 		if (v->child->resized_x)
1009 			v->child->begin_x = v->child->resized_x;
1010 		if (view->parent)
1011 			v->child->begin_x -= resize;
1012 		else
1013 			v->child->begin_x += resize;
1014 		if (v->child->begin_x < 11) {
1015 			view->count = 0;
1016 			v->child->begin_x = 11;
1017 		} else if (v->child->begin_x > COLS - 1) {
1018 			view->count = 0;
1019 			v->child->begin_x = COLS - 1;
1020 		}
1021 		v->child->resized_x = v->child->begin_x;
1022 	}
1023 
1024 	v->child->mode = v->mode;
1025 	v->child->nlines = v->lines - v->child->begin_y;
1026 	v->child->ncols = v->cols - v->child->begin_x;
1027 	v->focus_child = 1;
1028 
1029 	err = view_fullscreen(v);
1030 	if (err)
1031 		return err;
1032 	err = view_splitscreen(v->child);
1033 	if (err)
1034 		return err;
1035 
1036 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1037 		err = offset_selection_down(v->child);
1038 		if (err)
1039 			return err;
1040 	}
1041 
1042 	if (v->resize)
1043 		err = v->resize(v, 0);
1044 	else if (v->child->resize)
1045 		err = v->child->resize(v->child, 0);
1046 
1047 	v->resized = v->child->resized = 0;
1048 
1049 	return err;
1050 }
1051 
1052 static void
1053 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1054 {
1055 	struct tog_view *v = src->child ? src->child : src;
1056 
1057 	dst->resized_x = v->resized_x;
1058 	dst->resized_y = v->resized_y;
1059 }
1060 
1061 static const struct got_error *
1062 view_close_child(struct tog_view *view)
1063 {
1064 	const struct got_error *err = NULL;
1065 
1066 	if (view->child == NULL)
1067 		return NULL;
1068 
1069 	err = view_close(view->child);
1070 	view->child = NULL;
1071 	return err;
1072 }
1073 
1074 static const struct got_error *
1075 view_set_child(struct tog_view *view, struct tog_view *child)
1076 {
1077 	const struct got_error *err = NULL;
1078 
1079 	view->child = child;
1080 	child->parent = view;
1081 
1082 	err = view_resize(view);
1083 	if (err)
1084 		return err;
1085 
1086 	if (view->child->resized_x || view->child->resized_y)
1087 		err = view_resize_split(view, 0);
1088 
1089 	return err;
1090 }
1091 
1092 static const struct got_error *view_dispatch_request(struct tog_view **,
1093     struct tog_view *, enum tog_view_type, int, int);
1094 
1095 static const struct got_error *
1096 view_request_new(struct tog_view **requested, struct tog_view *view,
1097     enum tog_view_type request)
1098 {
1099 	struct tog_view		*new_view = NULL;
1100 	const struct got_error	*err;
1101 	int			 y = 0, x = 0;
1102 
1103 	*requested = NULL;
1104 
1105 	if (view_is_parent_view(view))
1106 		view_get_split(view, &y, &x);
1107 
1108 	err = view_dispatch_request(&new_view, view, request, y, x);
1109 	if (err)
1110 		return err;
1111 
1112 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1113 		err = view_init_hsplit(view, y);
1114 		if (err)
1115 			return err;
1116 	}
1117 
1118 	view->focussed = 0;
1119 	new_view->focussed = 1;
1120 	new_view->mode = view->mode;
1121 	new_view->nlines = view->lines - y;
1122 
1123 	if (view_is_parent_view(view)) {
1124 		view_transfer_size(new_view, view);
1125 		err = view_close_child(view);
1126 		if (err)
1127 			return err;
1128 		err = view_set_child(view, new_view);
1129 		if (err)
1130 			return err;
1131 		view->focus_child = 1;
1132 	} else
1133 		*requested = new_view;
1134 
1135 	return NULL;
1136 }
1137 
1138 static void
1139 tog_resizeterm(void)
1140 {
1141 	int cols, lines;
1142 	struct winsize size;
1143 
1144 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1145 		cols = 80;     /* Default */
1146 		lines = 24;
1147 	} else {
1148 		cols = size.ws_col;
1149 		lines = size.ws_row;
1150 	}
1151 	resize_term(lines, cols);
1152 }
1153 
1154 static const struct got_error *
1155 view_search_start(struct tog_view *view)
1156 {
1157 	const struct got_error *err = NULL;
1158 	struct tog_view *v = view;
1159 	char pattern[1024];
1160 	int ret;
1161 
1162 	if (view->search_started) {
1163 		regfree(&view->regex);
1164 		view->searching = 0;
1165 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1166 	}
1167 	view->search_started = 0;
1168 
1169 	if (view->nlines < 1)
1170 		return NULL;
1171 
1172 	if (view_is_hsplit_top(view))
1173 		v = view->child;
1174 
1175 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1176 	wclrtoeol(v->window);
1177 
1178 	nodelay(view->window, FALSE);  /* block for search term input */
1179 	nocbreak();
1180 	echo();
1181 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1182 	wrefresh(v->window);
1183 	cbreak();
1184 	noecho();
1185 	nodelay(view->window, TRUE);
1186 	if (ret == ERR)
1187 		return NULL;
1188 
1189 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1190 		err = view->search_start(view);
1191 		if (err) {
1192 			regfree(&view->regex);
1193 			return err;
1194 		}
1195 		view->search_started = 1;
1196 		view->searching = TOG_SEARCH_FORWARD;
1197 		view->search_next_done = 0;
1198 		view->search_next(view);
1199 	}
1200 
1201 	return NULL;
1202 }
1203 
1204 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1205 static const struct got_error *
1206 switch_split(struct tog_view *view)
1207 {
1208 	const struct got_error	*err = NULL;
1209 	struct tog_view		*v = NULL;
1210 
1211 	if (view->parent)
1212 		v = view->parent;
1213 	else
1214 		v = view;
1215 
1216 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1217 		v->mode = TOG_VIEW_SPLIT_VERT;
1218 	else
1219 		v->mode = TOG_VIEW_SPLIT_HRZN;
1220 
1221 	if (!v->child)
1222 		return NULL;
1223 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1224 		v->mode = TOG_VIEW_SPLIT_NONE;
1225 
1226 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1227 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1228 		v->child->begin_y = v->child->resized_y;
1229 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1230 		v->child->begin_x = v->child->resized_x;
1231 
1232 
1233 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1234 		v->ncols = COLS;
1235 		v->child->ncols = COLS;
1236 		v->child->nscrolled = LINES - v->child->nlines;
1237 
1238 		err = view_init_hsplit(v, v->child->begin_y);
1239 		if (err)
1240 			return err;
1241 	}
1242 	v->child->mode = v->mode;
1243 	v->child->nlines = v->lines - v->child->begin_y;
1244 	v->focus_child = 1;
1245 
1246 	err = view_fullscreen(v);
1247 	if (err)
1248 		return err;
1249 	err = view_splitscreen(v->child);
1250 	if (err)
1251 		return err;
1252 
1253 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1254 		v->mode = TOG_VIEW_SPLIT_VERT;
1255 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1256 		err = offset_selection_down(v);
1257 		if (err)
1258 			return err;
1259 		err = offset_selection_down(v->child);
1260 		if (err)
1261 			return err;
1262 	} else {
1263 		offset_selection_up(v);
1264 		offset_selection_up(v->child);
1265 	}
1266 	if (v->resize)
1267 		err = v->resize(v, 0);
1268 	else if (v->child->resize)
1269 		err = v->child->resize(v->child, 0);
1270 
1271 	return err;
1272 }
1273 
1274 /*
1275  * Compute view->count from numeric input. Assign total to view->count and
1276  * return first non-numeric key entered.
1277  */
1278 static int
1279 get_compound_key(struct tog_view *view, int c)
1280 {
1281 	struct tog_view	*v = view;
1282 	int		 x, n = 0;
1283 
1284 	if (view_is_hsplit_top(view))
1285 		v = view->child;
1286 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1287 		v = view->parent;
1288 
1289 	view->count = 0;
1290 	cbreak();  /* block for input */
1291 	nodelay(view->window, FALSE);
1292 	wmove(v->window, v->nlines - 1, 0);
1293 	wclrtoeol(v->window);
1294 	waddch(v->window, ':');
1295 
1296 	do {
1297 		x = getcurx(v->window);
1298 		if (x != ERR && x < view->ncols) {
1299 			waddch(v->window, c);
1300 			wrefresh(v->window);
1301 		}
1302 
1303 		/*
1304 		 * Don't overflow. Max valid request should be the greatest
1305 		 * between the longest and total lines; cap at 10 million.
1306 		 */
1307 		if (n >= 9999999)
1308 			n = 9999999;
1309 		else
1310 			n = n * 10 + (c - '0');
1311 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1312 
1313 	if (c == 'G' || c == 'g') {	/* nG key map */
1314 		view->gline = view->hiline = n;
1315 		n = 0;
1316 		c = 0;
1317 	}
1318 
1319 	/* Massage excessive or inapplicable values at the input handler. */
1320 	view->count = n;
1321 
1322 	return c;
1323 }
1324 
1325 static const struct got_error *
1326 view_input(struct tog_view **new, int *done, struct tog_view *view,
1327     struct tog_view_list_head *views)
1328 {
1329 	const struct got_error *err = NULL;
1330 	struct tog_view *v;
1331 	int ch, errcode;
1332 
1333 	*new = NULL;
1334 
1335 	/* Clear "no matches" indicator. */
1336 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1337 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1338 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1339 		view->count = 0;
1340 	}
1341 
1342 	if (view->searching && !view->search_next_done) {
1343 		errcode = pthread_mutex_unlock(&tog_mutex);
1344 		if (errcode)
1345 			return got_error_set_errno(errcode,
1346 			    "pthread_mutex_unlock");
1347 		sched_yield();
1348 		errcode = pthread_mutex_lock(&tog_mutex);
1349 		if (errcode)
1350 			return got_error_set_errno(errcode,
1351 			    "pthread_mutex_lock");
1352 		view->search_next(view);
1353 		return NULL;
1354 	}
1355 
1356 	/* Allow threads to make progress while we are waiting for input. */
1357 	errcode = pthread_mutex_unlock(&tog_mutex);
1358 	if (errcode)
1359 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1360 	/* If we have an unfinished count, let C-g or backspace abort. */
1361 	if (view->count && --view->count) {
1362 		cbreak();
1363 		nodelay(view->window, TRUE);
1364 		ch = wgetch(view->window);
1365 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1366 			view->count = 0;
1367 		else
1368 			ch = view->ch;
1369 	} else {
1370 		ch = wgetch(view->window);
1371 		if (ch >= '1' && ch  <= '9')
1372 			view->ch = ch = get_compound_key(view, ch);
1373 	}
1374 	if (view->hiline && ch != ERR && ch != 0)
1375 		view->hiline = 0;  /* key pressed, clear line highlight */
1376 	nodelay(view->window, TRUE);
1377 	errcode = pthread_mutex_lock(&tog_mutex);
1378 	if (errcode)
1379 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1380 
1381 	if (tog_sigwinch_received || tog_sigcont_received) {
1382 		tog_resizeterm();
1383 		tog_sigwinch_received = 0;
1384 		tog_sigcont_received = 0;
1385 		TAILQ_FOREACH(v, views, entry) {
1386 			err = view_resize(v);
1387 			if (err)
1388 				return err;
1389 			err = v->input(new, v, KEY_RESIZE);
1390 			if (err)
1391 				return err;
1392 			if (v->child) {
1393 				err = view_resize(v->child);
1394 				if (err)
1395 					return err;
1396 				err = v->child->input(new, v->child,
1397 				    KEY_RESIZE);
1398 				if (err)
1399 					return err;
1400 				if (v->child->resized_x || v->child->resized_y) {
1401 					err = view_resize_split(v, 0);
1402 					if (err)
1403 						return err;
1404 				}
1405 			}
1406 		}
1407 	}
1408 
1409 	switch (ch) {
1410 	case '\t':
1411 		view->count = 0;
1412 		if (view->child) {
1413 			view->focussed = 0;
1414 			view->child->focussed = 1;
1415 			view->focus_child = 1;
1416 		} else if (view->parent) {
1417 			view->focussed = 0;
1418 			view->parent->focussed = 1;
1419 			view->parent->focus_child = 0;
1420 			if (!view_is_splitscreen(view)) {
1421 				if (view->parent->resize) {
1422 					err = view->parent->resize(view->parent,
1423 					    0);
1424 					if (err)
1425 						return err;
1426 				}
1427 				offset_selection_up(view->parent);
1428 				err = view_fullscreen(view->parent);
1429 				if (err)
1430 					return err;
1431 			}
1432 		}
1433 		break;
1434 	case 'q':
1435 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1436 			if (view->parent->resize) {
1437 				/* might need more commits to fill fullscreen */
1438 				err = view->parent->resize(view->parent, 0);
1439 				if (err)
1440 					break;
1441 			}
1442 			offset_selection_up(view->parent);
1443 		}
1444 		err = view->input(new, view, ch);
1445 		view->dying = 1;
1446 		break;
1447 	case 'Q':
1448 		*done = 1;
1449 		break;
1450 	case 'F':
1451 		view->count = 0;
1452 		if (view_is_parent_view(view)) {
1453 			if (view->child == NULL)
1454 				break;
1455 			if (view_is_splitscreen(view->child)) {
1456 				view->focussed = 0;
1457 				view->child->focussed = 1;
1458 				err = view_fullscreen(view->child);
1459 			} else {
1460 				err = view_splitscreen(view->child);
1461 				if (!err)
1462 					err = view_resize_split(view, 0);
1463 			}
1464 			if (err)
1465 				break;
1466 			err = view->child->input(new, view->child,
1467 			    KEY_RESIZE);
1468 		} else {
1469 			if (view_is_splitscreen(view)) {
1470 				view->parent->focussed = 0;
1471 				view->focussed = 1;
1472 				err = view_fullscreen(view);
1473 			} else {
1474 				err = view_splitscreen(view);
1475 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1476 					err = view_resize(view->parent);
1477 				if (!err)
1478 					err = view_resize_split(view, 0);
1479 			}
1480 			if (err)
1481 				break;
1482 			err = view->input(new, view, KEY_RESIZE);
1483 		}
1484 		if (err)
1485 			break;
1486 		if (view->resize) {
1487 			err = view->resize(view, 0);
1488 			if (err)
1489 				break;
1490 		}
1491 		if (view->parent)
1492 			err = offset_selection_down(view->parent);
1493 		if (!err)
1494 			err = offset_selection_down(view);
1495 		break;
1496 	case 'S':
1497 		view->count = 0;
1498 		err = switch_split(view);
1499 		break;
1500 	case '-':
1501 		err = view_resize_split(view, -1);
1502 		break;
1503 	case '+':
1504 		err = view_resize_split(view, 1);
1505 		break;
1506 	case KEY_RESIZE:
1507 		break;
1508 	case '/':
1509 		view->count = 0;
1510 		if (view->search_start)
1511 			view_search_start(view);
1512 		else
1513 			err = view->input(new, view, ch);
1514 		break;
1515 	case 'N':
1516 	case 'n':
1517 		if (view->search_started && view->search_next) {
1518 			view->searching = (ch == 'n' ?
1519 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1520 			view->search_next_done = 0;
1521 			view->search_next(view);
1522 		} else
1523 			err = view->input(new, view, ch);
1524 		break;
1525 	case 'A':
1526 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1527 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1528 		else
1529 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1530 		TAILQ_FOREACH(v, views, entry) {
1531 			if (v->reset) {
1532 				err = v->reset(v);
1533 				if (err)
1534 					return err;
1535 			}
1536 			if (v->child && v->child->reset) {
1537 				err = v->child->reset(v->child);
1538 				if (err)
1539 					return err;
1540 			}
1541 		}
1542 		break;
1543 	default:
1544 		err = view->input(new, view, ch);
1545 		break;
1546 	}
1547 
1548 	return err;
1549 }
1550 
1551 static int
1552 view_needs_focus_indication(struct tog_view *view)
1553 {
1554 	if (view_is_parent_view(view)) {
1555 		if (view->child == NULL || view->child->focussed)
1556 			return 0;
1557 		if (!view_is_splitscreen(view->child))
1558 			return 0;
1559 	} else if (!view_is_splitscreen(view))
1560 		return 0;
1561 
1562 	return view->focussed;
1563 }
1564 
1565 static const struct got_error *
1566 view_loop(struct tog_view *view)
1567 {
1568 	const struct got_error *err = NULL;
1569 	struct tog_view_list_head views;
1570 	struct tog_view *new_view;
1571 	char *mode;
1572 	int fast_refresh = 10;
1573 	int done = 0, errcode;
1574 
1575 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1576 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1577 		view->mode = TOG_VIEW_SPLIT_VERT;
1578 	else
1579 		view->mode = TOG_VIEW_SPLIT_HRZN;
1580 
1581 	errcode = pthread_mutex_lock(&tog_mutex);
1582 	if (errcode)
1583 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1584 
1585 	TAILQ_INIT(&views);
1586 	TAILQ_INSERT_HEAD(&views, view, entry);
1587 
1588 	view->focussed = 1;
1589 	err = view->show(view);
1590 	if (err)
1591 		return err;
1592 	update_panels();
1593 	doupdate();
1594 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1595 	    !tog_fatal_signal_received()) {
1596 		/* Refresh fast during initialization, then become slower. */
1597 		if (fast_refresh && fast_refresh-- == 0)
1598 			halfdelay(10); /* switch to once per second */
1599 
1600 		err = view_input(&new_view, &done, view, &views);
1601 		if (err)
1602 			break;
1603 		if (view->dying) {
1604 			struct tog_view *v, *prev = NULL;
1605 
1606 			if (view_is_parent_view(view))
1607 				prev = TAILQ_PREV(view, tog_view_list_head,
1608 				    entry);
1609 			else if (view->parent)
1610 				prev = view->parent;
1611 
1612 			if (view->parent) {
1613 				view->parent->child = NULL;
1614 				view->parent->focus_child = 0;
1615 				/* Restore fullscreen line height. */
1616 				view->parent->nlines = view->parent->lines;
1617 				err = view_resize(view->parent);
1618 				if (err)
1619 					break;
1620 				/* Make resized splits persist. */
1621 				view_transfer_size(view->parent, view);
1622 			} else
1623 				TAILQ_REMOVE(&views, view, entry);
1624 
1625 			err = view_close(view);
1626 			if (err)
1627 				goto done;
1628 
1629 			view = NULL;
1630 			TAILQ_FOREACH(v, &views, entry) {
1631 				if (v->focussed)
1632 					break;
1633 			}
1634 			if (view == NULL && new_view == NULL) {
1635 				/* No view has focus. Try to pick one. */
1636 				if (prev)
1637 					view = prev;
1638 				else if (!TAILQ_EMPTY(&views)) {
1639 					view = TAILQ_LAST(&views,
1640 					    tog_view_list_head);
1641 				}
1642 				if (view) {
1643 					if (view->focus_child) {
1644 						view->child->focussed = 1;
1645 						view = view->child;
1646 					} else
1647 						view->focussed = 1;
1648 				}
1649 			}
1650 		}
1651 		if (new_view) {
1652 			struct tog_view *v, *t;
1653 			/* Only allow one parent view per type. */
1654 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1655 				if (v->type != new_view->type)
1656 					continue;
1657 				TAILQ_REMOVE(&views, v, entry);
1658 				err = view_close(v);
1659 				if (err)
1660 					goto done;
1661 				break;
1662 			}
1663 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1664 			view = new_view;
1665 		}
1666 		if (view) {
1667 			if (view_is_parent_view(view)) {
1668 				if (view->child && view->child->focussed)
1669 					view = view->child;
1670 			} else {
1671 				if (view->parent && view->parent->focussed)
1672 					view = view->parent;
1673 			}
1674 			show_panel(view->panel);
1675 			if (view->child && view_is_splitscreen(view->child))
1676 				show_panel(view->child->panel);
1677 			if (view->parent && view_is_splitscreen(view)) {
1678 				err = view->parent->show(view->parent);
1679 				if (err)
1680 					goto done;
1681 			}
1682 			err = view->show(view);
1683 			if (err)
1684 				goto done;
1685 			if (view->child) {
1686 				err = view->child->show(view->child);
1687 				if (err)
1688 					goto done;
1689 			}
1690 			update_panels();
1691 			doupdate();
1692 		}
1693 	}
1694 done:
1695 	while (!TAILQ_EMPTY(&views)) {
1696 		const struct got_error *close_err;
1697 		view = TAILQ_FIRST(&views);
1698 		TAILQ_REMOVE(&views, view, entry);
1699 		close_err = view_close(view);
1700 		if (close_err && err == NULL)
1701 			err = close_err;
1702 	}
1703 
1704 	errcode = pthread_mutex_unlock(&tog_mutex);
1705 	if (errcode && err == NULL)
1706 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1707 
1708 	return err;
1709 }
1710 
1711 __dead static void
1712 usage_log(void)
1713 {
1714 	endwin();
1715 	fprintf(stderr,
1716 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1717 	    getprogname());
1718 	exit(1);
1719 }
1720 
1721 /* Create newly allocated wide-character string equivalent to a byte string. */
1722 static const struct got_error *
1723 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1724 {
1725 	char *vis = NULL;
1726 	const struct got_error *err = NULL;
1727 
1728 	*ws = NULL;
1729 	*wlen = mbstowcs(NULL, s, 0);
1730 	if (*wlen == (size_t)-1) {
1731 		int vislen;
1732 		if (errno != EILSEQ)
1733 			return got_error_from_errno("mbstowcs");
1734 
1735 		/* byte string invalid in current encoding; try to "fix" it */
1736 		err = got_mbsavis(&vis, &vislen, s);
1737 		if (err)
1738 			return err;
1739 		*wlen = mbstowcs(NULL, vis, 0);
1740 		if (*wlen == (size_t)-1) {
1741 			err = got_error_from_errno("mbstowcs"); /* give up */
1742 			goto done;
1743 		}
1744 	}
1745 
1746 	*ws = calloc(*wlen + 1, sizeof(**ws));
1747 	if (*ws == NULL) {
1748 		err = got_error_from_errno("calloc");
1749 		goto done;
1750 	}
1751 
1752 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1753 		err = got_error_from_errno("mbstowcs");
1754 done:
1755 	free(vis);
1756 	if (err) {
1757 		free(*ws);
1758 		*ws = NULL;
1759 		*wlen = 0;
1760 	}
1761 	return err;
1762 }
1763 
1764 static const struct got_error *
1765 expand_tab(char **ptr, const char *src)
1766 {
1767 	char	*dst;
1768 	size_t	 len, n, idx = 0, sz = 0;
1769 
1770 	*ptr = NULL;
1771 	n = len = strlen(src);
1772 	dst = malloc(n + 1);
1773 	if (dst == NULL)
1774 		return got_error_from_errno("malloc");
1775 
1776 	while (idx < len && src[idx]) {
1777 		const char c = src[idx];
1778 
1779 		if (c == '\t') {
1780 			size_t nb = TABSIZE - sz % TABSIZE;
1781 			char *p;
1782 
1783 			p = realloc(dst, n + nb);
1784 			if (p == NULL) {
1785 				free(dst);
1786 				return got_error_from_errno("realloc");
1787 
1788 			}
1789 			dst = p;
1790 			n += nb;
1791 			memset(dst + sz, ' ', nb);
1792 			sz += nb;
1793 		} else
1794 			dst[sz++] = src[idx];
1795 		++idx;
1796 	}
1797 
1798 	dst[sz] = '\0';
1799 	*ptr = dst;
1800 	return NULL;
1801 }
1802 
1803 /*
1804  * Advance at most n columns from wline starting at offset off.
1805  * Return the index to the first character after the span operation.
1806  * Return the combined column width of all spanned wide character in
1807  * *rcol.
1808  */
1809 static int
1810 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1811 {
1812 	int width, i, cols = 0;
1813 
1814 	if (n == 0) {
1815 		*rcol = cols;
1816 		return off;
1817 	}
1818 
1819 	for (i = off; wline[i] != L'\0'; ++i) {
1820 		if (wline[i] == L'\t')
1821 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1822 		else
1823 			width = wcwidth(wline[i]);
1824 
1825 		if (width == -1) {
1826 			width = 1;
1827 			wline[i] = L'.';
1828 		}
1829 
1830 		if (cols + width > n)
1831 			break;
1832 		cols += width;
1833 	}
1834 
1835 	*rcol = cols;
1836 	return i;
1837 }
1838 
1839 /*
1840  * Format a line for display, ensuring that it won't overflow a width limit.
1841  * With scrolling, the width returned refers to the scrolled version of the
1842  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1843  */
1844 static const struct got_error *
1845 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1846     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1847 {
1848 	const struct got_error *err = NULL;
1849 	int cols;
1850 	wchar_t *wline = NULL;
1851 	char *exstr = NULL;
1852 	size_t wlen;
1853 	int i, scrollx;
1854 
1855 	*wlinep = NULL;
1856 	*widthp = 0;
1857 
1858 	if (expand) {
1859 		err = expand_tab(&exstr, line);
1860 		if (err)
1861 			return err;
1862 	}
1863 
1864 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1865 	free(exstr);
1866 	if (err)
1867 		return err;
1868 
1869 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1870 
1871 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1872 		wline[wlen - 1] = L'\0';
1873 		wlen--;
1874 	}
1875 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1876 		wline[wlen - 1] = L'\0';
1877 		wlen--;
1878 	}
1879 
1880 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1881 	wline[i] = L'\0';
1882 
1883 	if (widthp)
1884 		*widthp = cols;
1885 	if (scrollxp)
1886 		*scrollxp = scrollx;
1887 	if (err)
1888 		free(wline);
1889 	else
1890 		*wlinep = wline;
1891 	return err;
1892 }
1893 
1894 static const struct got_error*
1895 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1896     struct got_object_id *id, struct got_repository *repo)
1897 {
1898 	static const struct got_error *err = NULL;
1899 	struct got_reflist_entry *re;
1900 	char *s;
1901 	const char *name;
1902 
1903 	*refs_str = NULL;
1904 
1905 	TAILQ_FOREACH(re, refs, entry) {
1906 		struct got_tag_object *tag = NULL;
1907 		struct got_object_id *ref_id;
1908 		int cmp;
1909 
1910 		name = got_ref_get_name(re->ref);
1911 		if (strcmp(name, GOT_REF_HEAD) == 0)
1912 			continue;
1913 		if (strncmp(name, "refs/", 5) == 0)
1914 			name += 5;
1915 		if (strncmp(name, "got/", 4) == 0 &&
1916 		    strncmp(name, "got/backup/", 11) != 0)
1917 			continue;
1918 		if (strncmp(name, "heads/", 6) == 0)
1919 			name += 6;
1920 		if (strncmp(name, "remotes/", 8) == 0) {
1921 			name += 8;
1922 			s = strstr(name, "/" GOT_REF_HEAD);
1923 			if (s != NULL && s[strlen(s)] == '\0')
1924 				continue;
1925 		}
1926 		err = got_ref_resolve(&ref_id, repo, re->ref);
1927 		if (err)
1928 			break;
1929 		if (strncmp(name, "tags/", 5) == 0) {
1930 			err = got_object_open_as_tag(&tag, repo, ref_id);
1931 			if (err) {
1932 				if (err->code != GOT_ERR_OBJ_TYPE) {
1933 					free(ref_id);
1934 					break;
1935 				}
1936 				/* Ref points at something other than a tag. */
1937 				err = NULL;
1938 				tag = NULL;
1939 			}
1940 		}
1941 		cmp = got_object_id_cmp(tag ?
1942 		    got_object_tag_get_object_id(tag) : ref_id, id);
1943 		free(ref_id);
1944 		if (tag)
1945 			got_object_tag_close(tag);
1946 		if (cmp != 0)
1947 			continue;
1948 		s = *refs_str;
1949 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1950 		    s ? ", " : "", name) == -1) {
1951 			err = got_error_from_errno("asprintf");
1952 			free(s);
1953 			*refs_str = NULL;
1954 			break;
1955 		}
1956 		free(s);
1957 	}
1958 
1959 	return err;
1960 }
1961 
1962 static const struct got_error *
1963 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1964     int col_tab_align)
1965 {
1966 	char *smallerthan;
1967 
1968 	smallerthan = strchr(author, '<');
1969 	if (smallerthan && smallerthan[1] != '\0')
1970 		author = smallerthan + 1;
1971 	author[strcspn(author, "@>")] = '\0';
1972 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1973 	    col_tab_align, 0);
1974 }
1975 
1976 static const struct got_error *
1977 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1978     struct got_object_id *id, const size_t date_display_cols,
1979     int author_display_cols)
1980 {
1981 	struct tog_log_view_state *s = &view->state.log;
1982 	const struct got_error *err = NULL;
1983 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1984 	char *logmsg0 = NULL, *logmsg = NULL;
1985 	char *author = NULL;
1986 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1987 	int author_width, logmsg_width;
1988 	char *newline, *line = NULL;
1989 	int col, limit, scrollx;
1990 	const int avail = view->ncols;
1991 	struct tm tm;
1992 	time_t committer_time;
1993 	struct tog_color *tc;
1994 
1995 	committer_time = got_object_commit_get_committer_time(commit);
1996 	if (gmtime_r(&committer_time, &tm) == NULL)
1997 		return got_error_from_errno("gmtime_r");
1998 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1999 		return got_error(GOT_ERR_NO_SPACE);
2000 
2001 	if (avail <= date_display_cols)
2002 		limit = MIN(sizeof(datebuf) - 1, avail);
2003 	else
2004 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2005 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2006 	if (tc)
2007 		wattr_on(view->window,
2008 		    COLOR_PAIR(tc->colorpair), NULL);
2009 	waddnstr(view->window, datebuf, limit);
2010 	if (tc)
2011 		wattr_off(view->window,
2012 		    COLOR_PAIR(tc->colorpair), NULL);
2013 	col = limit;
2014 	if (col > avail)
2015 		goto done;
2016 
2017 	if (avail >= 120) {
2018 		char *id_str;
2019 		err = got_object_id_str(&id_str, id);
2020 		if (err)
2021 			goto done;
2022 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2023 		if (tc)
2024 			wattr_on(view->window,
2025 			    COLOR_PAIR(tc->colorpair), NULL);
2026 		wprintw(view->window, "%.8s ", id_str);
2027 		if (tc)
2028 			wattr_off(view->window,
2029 			    COLOR_PAIR(tc->colorpair), NULL);
2030 		free(id_str);
2031 		col += 9;
2032 		if (col > avail)
2033 			goto done;
2034 	}
2035 
2036 	if (s->use_committer)
2037 		author = strdup(got_object_commit_get_committer(commit));
2038 	else
2039 		author = strdup(got_object_commit_get_author(commit));
2040 	if (author == NULL) {
2041 		err = got_error_from_errno("strdup");
2042 		goto done;
2043 	}
2044 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2045 	if (err)
2046 		goto done;
2047 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2048 	if (tc)
2049 		wattr_on(view->window,
2050 		    COLOR_PAIR(tc->colorpair), NULL);
2051 	waddwstr(view->window, wauthor);
2052 	if (tc)
2053 		wattr_off(view->window,
2054 		    COLOR_PAIR(tc->colorpair), NULL);
2055 	col += author_width;
2056 	while (col < avail && author_width < author_display_cols + 2) {
2057 		waddch(view->window, ' ');
2058 		col++;
2059 		author_width++;
2060 	}
2061 	if (col > avail)
2062 		goto done;
2063 
2064 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2065 	if (err)
2066 		goto done;
2067 	logmsg = logmsg0;
2068 	while (*logmsg == '\n')
2069 		logmsg++;
2070 	newline = strchr(logmsg, '\n');
2071 	if (newline)
2072 		*newline = '\0';
2073 	limit = avail - col;
2074 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2075 		limit--;	/* for the border */
2076 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2077 	    limit, col, 1);
2078 	if (err)
2079 		goto done;
2080 	waddwstr(view->window, &wlogmsg[scrollx]);
2081 	col += MAX(logmsg_width, 0);
2082 	while (col < avail) {
2083 		waddch(view->window, ' ');
2084 		col++;
2085 	}
2086 done:
2087 	free(logmsg0);
2088 	free(wlogmsg);
2089 	free(author);
2090 	free(wauthor);
2091 	free(line);
2092 	return err;
2093 }
2094 
2095 static struct commit_queue_entry *
2096 alloc_commit_queue_entry(struct got_commit_object *commit,
2097     struct got_object_id *id)
2098 {
2099 	struct commit_queue_entry *entry;
2100 
2101 	entry = calloc(1, sizeof(*entry));
2102 	if (entry == NULL)
2103 		return NULL;
2104 
2105 	entry->id = id;
2106 	entry->commit = commit;
2107 	return entry;
2108 }
2109 
2110 static void
2111 pop_commit(struct commit_queue *commits)
2112 {
2113 	struct commit_queue_entry *entry;
2114 
2115 	entry = TAILQ_FIRST(&commits->head);
2116 	TAILQ_REMOVE(&commits->head, entry, entry);
2117 	got_object_commit_close(entry->commit);
2118 	commits->ncommits--;
2119 	/* Don't free entry->id! It is owned by the commit graph. */
2120 	free(entry);
2121 }
2122 
2123 static void
2124 free_commits(struct commit_queue *commits)
2125 {
2126 	while (!TAILQ_EMPTY(&commits->head))
2127 		pop_commit(commits);
2128 }
2129 
2130 static const struct got_error *
2131 match_commit(int *have_match, struct got_object_id *id,
2132     struct got_commit_object *commit, regex_t *regex)
2133 {
2134 	const struct got_error *err = NULL;
2135 	regmatch_t regmatch;
2136 	char *id_str = NULL, *logmsg = NULL;
2137 
2138 	*have_match = 0;
2139 
2140 	err = got_object_id_str(&id_str, id);
2141 	if (err)
2142 		return err;
2143 
2144 	err = got_object_commit_get_logmsg(&logmsg, commit);
2145 	if (err)
2146 		goto done;
2147 
2148 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2149 	    &regmatch, 0) == 0 ||
2150 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2151 	    &regmatch, 0) == 0 ||
2152 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2153 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2154 		*have_match = 1;
2155 done:
2156 	free(id_str);
2157 	free(logmsg);
2158 	return err;
2159 }
2160 
2161 static const struct got_error *
2162 queue_commits(struct tog_log_thread_args *a)
2163 {
2164 	const struct got_error *err = NULL;
2165 
2166 	/*
2167 	 * We keep all commits open throughout the lifetime of the log
2168 	 * view in order to avoid having to re-fetch commits from disk
2169 	 * while updating the display.
2170 	 */
2171 	do {
2172 		struct got_object_id *id;
2173 		struct got_commit_object *commit;
2174 		struct commit_queue_entry *entry;
2175 		int errcode;
2176 
2177 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2178 		    NULL, NULL);
2179 		if (err || id == NULL)
2180 			break;
2181 
2182 		err = got_object_open_as_commit(&commit, a->repo, id);
2183 		if (err)
2184 			break;
2185 		entry = alloc_commit_queue_entry(commit, id);
2186 		if (entry == NULL) {
2187 			err = got_error_from_errno("alloc_commit_queue_entry");
2188 			break;
2189 		}
2190 
2191 		errcode = pthread_mutex_lock(&tog_mutex);
2192 		if (errcode) {
2193 			err = got_error_set_errno(errcode,
2194 			    "pthread_mutex_lock");
2195 			break;
2196 		}
2197 
2198 		entry->idx = a->commits->ncommits;
2199 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2200 		a->commits->ncommits++;
2201 
2202 		if (*a->searching == TOG_SEARCH_FORWARD &&
2203 		    !*a->search_next_done) {
2204 			int have_match;
2205 			err = match_commit(&have_match, id, commit, a->regex);
2206 			if (err)
2207 				break;
2208 			if (have_match)
2209 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2210 		}
2211 
2212 		errcode = pthread_mutex_unlock(&tog_mutex);
2213 		if (errcode && err == NULL)
2214 			err = got_error_set_errno(errcode,
2215 			    "pthread_mutex_unlock");
2216 		if (err)
2217 			break;
2218 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2219 
2220 	return err;
2221 }
2222 
2223 static void
2224 select_commit(struct tog_log_view_state *s)
2225 {
2226 	struct commit_queue_entry *entry;
2227 	int ncommits = 0;
2228 
2229 	entry = s->first_displayed_entry;
2230 	while (entry) {
2231 		if (ncommits == s->selected) {
2232 			s->selected_entry = entry;
2233 			break;
2234 		}
2235 		entry = TAILQ_NEXT(entry, entry);
2236 		ncommits++;
2237 	}
2238 }
2239 
2240 static const struct got_error *
2241 draw_commits(struct tog_view *view)
2242 {
2243 	const struct got_error *err = NULL;
2244 	struct tog_log_view_state *s = &view->state.log;
2245 	struct commit_queue_entry *entry = s->selected_entry;
2246 	const int limit = view->nlines;
2247 	int width;
2248 	int ncommits, author_cols = 4;
2249 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2250 	char *refs_str = NULL;
2251 	wchar_t *wline;
2252 	struct tog_color *tc;
2253 	static const size_t date_display_cols = 12;
2254 
2255 	if (s->selected_entry &&
2256 	    !(view->searching && view->search_next_done == 0)) {
2257 		struct got_reflist_head *refs;
2258 		err = got_object_id_str(&id_str, s->selected_entry->id);
2259 		if (err)
2260 			return err;
2261 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2262 		    s->selected_entry->id);
2263 		if (refs) {
2264 			err = build_refs_str(&refs_str, refs,
2265 			    s->selected_entry->id, s->repo);
2266 			if (err)
2267 				goto done;
2268 		}
2269 	}
2270 
2271 	if (s->thread_args.commits_needed == 0)
2272 		halfdelay(10); /* disable fast refresh */
2273 
2274 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2275 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2276 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2277 		    (view->searching && !view->search_next_done) ?
2278 		    "searching..." : "loading...") == -1) {
2279 			err = got_error_from_errno("asprintf");
2280 			goto done;
2281 		}
2282 	} else {
2283 		const char *search_str = NULL;
2284 
2285 		if (view->searching) {
2286 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2287 				search_str = "no more matches";
2288 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2289 				search_str = "no matches found";
2290 			else if (!view->search_next_done)
2291 				search_str = "searching...";
2292 		}
2293 
2294 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2295 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2296 		    search_str ? search_str :
2297 		    (refs_str ? refs_str : "")) == -1) {
2298 			err = got_error_from_errno("asprintf");
2299 			goto done;
2300 		}
2301 	}
2302 
2303 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2304 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2305 		    "........................................",
2306 		    s->in_repo_path, ncommits_str) == -1) {
2307 			err = got_error_from_errno("asprintf");
2308 			header = NULL;
2309 			goto done;
2310 		}
2311 	} else if (asprintf(&header, "commit %s%s",
2312 	    id_str ? id_str : "........................................",
2313 	    ncommits_str) == -1) {
2314 		err = got_error_from_errno("asprintf");
2315 		header = NULL;
2316 		goto done;
2317 	}
2318 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2319 	if (err)
2320 		goto done;
2321 
2322 	werase(view->window);
2323 
2324 	if (view_needs_focus_indication(view))
2325 		wstandout(view->window);
2326 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2327 	if (tc)
2328 		wattr_on(view->window,
2329 		    COLOR_PAIR(tc->colorpair), NULL);
2330 	waddwstr(view->window, wline);
2331 	if (tc)
2332 		wattr_off(view->window,
2333 		    COLOR_PAIR(tc->colorpair), NULL);
2334 	while (width < view->ncols) {
2335 		waddch(view->window, ' ');
2336 		width++;
2337 	}
2338 	if (view_needs_focus_indication(view))
2339 		wstandend(view->window);
2340 	free(wline);
2341 	if (limit <= 1)
2342 		goto done;
2343 
2344 	/* Grow author column size if necessary, and set view->maxx. */
2345 	entry = s->first_displayed_entry;
2346 	ncommits = 0;
2347 	view->maxx = 0;
2348 	while (entry) {
2349 		struct got_commit_object *c = entry->commit;
2350 		char *author, *eol, *msg, *msg0;
2351 		wchar_t *wauthor, *wmsg;
2352 		int width;
2353 		if (ncommits >= limit - 1)
2354 			break;
2355 		if (s->use_committer)
2356 			author = strdup(got_object_commit_get_committer(c));
2357 		else
2358 			author = strdup(got_object_commit_get_author(c));
2359 		if (author == NULL) {
2360 			err = got_error_from_errno("strdup");
2361 			goto done;
2362 		}
2363 		err = format_author(&wauthor, &width, author, COLS,
2364 		    date_display_cols);
2365 		if (author_cols < width)
2366 			author_cols = width;
2367 		free(wauthor);
2368 		free(author);
2369 		if (err)
2370 			goto done;
2371 		err = got_object_commit_get_logmsg(&msg0, c);
2372 		if (err)
2373 			goto done;
2374 		msg = msg0;
2375 		while (*msg == '\n')
2376 			++msg;
2377 		if ((eol = strchr(msg, '\n')))
2378 			*eol = '\0';
2379 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2380 		    date_display_cols + author_cols, 0);
2381 		if (err)
2382 			goto done;
2383 		view->maxx = MAX(view->maxx, width);
2384 		free(msg0);
2385 		free(wmsg);
2386 		ncommits++;
2387 		entry = TAILQ_NEXT(entry, entry);
2388 	}
2389 
2390 	entry = s->first_displayed_entry;
2391 	s->last_displayed_entry = s->first_displayed_entry;
2392 	ncommits = 0;
2393 	while (entry) {
2394 		if (ncommits >= limit - 1)
2395 			break;
2396 		if (ncommits == s->selected)
2397 			wstandout(view->window);
2398 		err = draw_commit(view, entry->commit, entry->id,
2399 		    date_display_cols, author_cols);
2400 		if (ncommits == s->selected)
2401 			wstandend(view->window);
2402 		if (err)
2403 			goto done;
2404 		ncommits++;
2405 		s->last_displayed_entry = entry;
2406 		entry = TAILQ_NEXT(entry, entry);
2407 	}
2408 
2409 	view_border(view);
2410 done:
2411 	free(id_str);
2412 	free(refs_str);
2413 	free(ncommits_str);
2414 	free(header);
2415 	return err;
2416 }
2417 
2418 static void
2419 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2420 {
2421 	struct commit_queue_entry *entry;
2422 	int nscrolled = 0;
2423 
2424 	entry = TAILQ_FIRST(&s->commits.head);
2425 	if (s->first_displayed_entry == entry)
2426 		return;
2427 
2428 	entry = s->first_displayed_entry;
2429 	while (entry && nscrolled < maxscroll) {
2430 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2431 		if (entry) {
2432 			s->first_displayed_entry = entry;
2433 			nscrolled++;
2434 		}
2435 	}
2436 }
2437 
2438 static const struct got_error *
2439 trigger_log_thread(struct tog_view *view, int wait)
2440 {
2441 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2442 	int errcode;
2443 
2444 	halfdelay(1); /* fast refresh while loading commits */
2445 
2446 	while (!ta->log_complete && !tog_thread_error &&
2447 	    (ta->commits_needed > 0 || ta->load_all)) {
2448 		/* Wake the log thread. */
2449 		errcode = pthread_cond_signal(&ta->need_commits);
2450 		if (errcode)
2451 			return got_error_set_errno(errcode,
2452 			    "pthread_cond_signal");
2453 
2454 		/*
2455 		 * The mutex will be released while the view loop waits
2456 		 * in wgetch(), at which time the log thread will run.
2457 		 */
2458 		if (!wait)
2459 			break;
2460 
2461 		/* Display progress update in log view. */
2462 		show_log_view(view);
2463 		update_panels();
2464 		doupdate();
2465 
2466 		/* Wait right here while next commit is being loaded. */
2467 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2468 		if (errcode)
2469 			return got_error_set_errno(errcode,
2470 			    "pthread_cond_wait");
2471 
2472 		/* Display progress update in log view. */
2473 		show_log_view(view);
2474 		update_panels();
2475 		doupdate();
2476 	}
2477 
2478 	return NULL;
2479 }
2480 
2481 static const struct got_error *
2482 request_log_commits(struct tog_view *view)
2483 {
2484 	struct tog_log_view_state	*state = &view->state.log;
2485 	const struct got_error		*err = NULL;
2486 
2487 	if (state->thread_args.log_complete)
2488 		return NULL;
2489 
2490 	state->thread_args.commits_needed += view->nscrolled;
2491 	err = trigger_log_thread(view, 1);
2492 	view->nscrolled = 0;
2493 
2494 	return err;
2495 }
2496 
2497 static const struct got_error *
2498 log_scroll_down(struct tog_view *view, int maxscroll)
2499 {
2500 	struct tog_log_view_state *s = &view->state.log;
2501 	const struct got_error *err = NULL;
2502 	struct commit_queue_entry *pentry;
2503 	int nscrolled = 0, ncommits_needed;
2504 
2505 	if (s->last_displayed_entry == NULL)
2506 		return NULL;
2507 
2508 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2509 	if (s->commits.ncommits < ncommits_needed &&
2510 	    !s->thread_args.log_complete) {
2511 		/*
2512 		 * Ask the log thread for required amount of commits.
2513 		 */
2514 		s->thread_args.commits_needed +=
2515 		    ncommits_needed - s->commits.ncommits;
2516 		err = trigger_log_thread(view, 1);
2517 		if (err)
2518 			return err;
2519 	}
2520 
2521 	do {
2522 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2523 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2524 			break;
2525 
2526 		s->last_displayed_entry = pentry ?
2527 		    pentry : s->last_displayed_entry;;
2528 
2529 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2530 		if (pentry == NULL)
2531 			break;
2532 		s->first_displayed_entry = pentry;
2533 	} while (++nscrolled < maxscroll);
2534 
2535 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2536 		view->nscrolled += nscrolled;
2537 	else
2538 		view->nscrolled = 0;
2539 
2540 	return err;
2541 }
2542 
2543 static const struct got_error *
2544 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2545     struct got_commit_object *commit, struct got_object_id *commit_id,
2546     struct tog_view *log_view, struct got_repository *repo)
2547 {
2548 	const struct got_error *err;
2549 	struct got_object_qid *parent_id;
2550 	struct tog_view *diff_view;
2551 
2552 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2553 	if (diff_view == NULL)
2554 		return got_error_from_errno("view_open");
2555 
2556 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2557 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2558 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2559 	if (err == NULL)
2560 		*new_view = diff_view;
2561 	return err;
2562 }
2563 
2564 static const struct got_error *
2565 tree_view_visit_subtree(struct tog_tree_view_state *s,
2566     struct got_tree_object *subtree)
2567 {
2568 	struct tog_parent_tree *parent;
2569 
2570 	parent = calloc(1, sizeof(*parent));
2571 	if (parent == NULL)
2572 		return got_error_from_errno("calloc");
2573 
2574 	parent->tree = s->tree;
2575 	parent->first_displayed_entry = s->first_displayed_entry;
2576 	parent->selected_entry = s->selected_entry;
2577 	parent->selected = s->selected;
2578 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2579 	s->tree = subtree;
2580 	s->selected = 0;
2581 	s->first_displayed_entry = NULL;
2582 	return NULL;
2583 }
2584 
2585 static const struct got_error *
2586 tree_view_walk_path(struct tog_tree_view_state *s,
2587     struct got_commit_object *commit, const char *path)
2588 {
2589 	const struct got_error *err = NULL;
2590 	struct got_tree_object *tree = NULL;
2591 	const char *p;
2592 	char *slash, *subpath = NULL;
2593 
2594 	/* Walk the path and open corresponding tree objects. */
2595 	p = path;
2596 	while (*p) {
2597 		struct got_tree_entry *te;
2598 		struct got_object_id *tree_id;
2599 		char *te_name;
2600 
2601 		while (p[0] == '/')
2602 			p++;
2603 
2604 		/* Ensure the correct subtree entry is selected. */
2605 		slash = strchr(p, '/');
2606 		if (slash == NULL)
2607 			te_name = strdup(p);
2608 		else
2609 			te_name = strndup(p, slash - p);
2610 		if (te_name == NULL) {
2611 			err = got_error_from_errno("strndup");
2612 			break;
2613 		}
2614 		te = got_object_tree_find_entry(s->tree, te_name);
2615 		if (te == NULL) {
2616 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2617 			free(te_name);
2618 			break;
2619 		}
2620 		free(te_name);
2621 		s->first_displayed_entry = s->selected_entry = te;
2622 
2623 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2624 			break; /* jump to this file's entry */
2625 
2626 		slash = strchr(p, '/');
2627 		if (slash)
2628 			subpath = strndup(path, slash - path);
2629 		else
2630 			subpath = strdup(path);
2631 		if (subpath == NULL) {
2632 			err = got_error_from_errno("strdup");
2633 			break;
2634 		}
2635 
2636 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2637 		    subpath);
2638 		if (err)
2639 			break;
2640 
2641 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2642 		free(tree_id);
2643 		if (err)
2644 			break;
2645 
2646 		err = tree_view_visit_subtree(s, tree);
2647 		if (err) {
2648 			got_object_tree_close(tree);
2649 			break;
2650 		}
2651 		if (slash == NULL)
2652 			break;
2653 		free(subpath);
2654 		subpath = NULL;
2655 		p = slash;
2656 	}
2657 
2658 	free(subpath);
2659 	return err;
2660 }
2661 
2662 static const struct got_error *
2663 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2664     struct commit_queue_entry *entry, const char *path,
2665     const char *head_ref_name, struct got_repository *repo)
2666 {
2667 	const struct got_error *err = NULL;
2668 	struct tog_tree_view_state *s;
2669 	struct tog_view *tree_view;
2670 
2671 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2672 	if (tree_view == NULL)
2673 		return got_error_from_errno("view_open");
2674 
2675 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2676 	if (err)
2677 		return err;
2678 	s = &tree_view->state.tree;
2679 
2680 	*new_view = tree_view;
2681 
2682 	if (got_path_is_root_dir(path))
2683 		return NULL;
2684 
2685 	return tree_view_walk_path(s, entry->commit, path);
2686 }
2687 
2688 static const struct got_error *
2689 block_signals_used_by_main_thread(void)
2690 {
2691 	sigset_t sigset;
2692 	int errcode;
2693 
2694 	if (sigemptyset(&sigset) == -1)
2695 		return got_error_from_errno("sigemptyset");
2696 
2697 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2698 	if (sigaddset(&sigset, SIGWINCH) == -1)
2699 		return got_error_from_errno("sigaddset");
2700 	if (sigaddset(&sigset, SIGCONT) == -1)
2701 		return got_error_from_errno("sigaddset");
2702 	if (sigaddset(&sigset, SIGINT) == -1)
2703 		return got_error_from_errno("sigaddset");
2704 	if (sigaddset(&sigset, SIGTERM) == -1)
2705 		return got_error_from_errno("sigaddset");
2706 
2707 	/* ncurses handles SIGTSTP */
2708 	if (sigaddset(&sigset, SIGTSTP) == -1)
2709 		return got_error_from_errno("sigaddset");
2710 
2711 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2712 	if (errcode)
2713 		return got_error_set_errno(errcode, "pthread_sigmask");
2714 
2715 	return NULL;
2716 }
2717 
2718 static void *
2719 log_thread(void *arg)
2720 {
2721 	const struct got_error *err = NULL;
2722 	int errcode = 0;
2723 	struct tog_log_thread_args *a = arg;
2724 	int done = 0;
2725 
2726 	/*
2727 	 * Sync startup with main thread such that we begin our
2728 	 * work once view_input() has released the mutex.
2729 	 */
2730 	errcode = pthread_mutex_lock(&tog_mutex);
2731 	if (errcode) {
2732 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2733 		return (void *)err;
2734 	}
2735 
2736 	err = block_signals_used_by_main_thread();
2737 	if (err) {
2738 		pthread_mutex_unlock(&tog_mutex);
2739 		goto done;
2740 	}
2741 
2742 	while (!done && !err && !tog_fatal_signal_received()) {
2743 		errcode = pthread_mutex_unlock(&tog_mutex);
2744 		if (errcode) {
2745 			err = got_error_set_errno(errcode,
2746 			    "pthread_mutex_unlock");
2747 			goto done;
2748 		}
2749 		err = queue_commits(a);
2750 		if (err) {
2751 			if (err->code != GOT_ERR_ITER_COMPLETED)
2752 				goto done;
2753 			err = NULL;
2754 			done = 1;
2755 		} else if (a->commits_needed > 0 && !a->load_all)
2756 			a->commits_needed--;
2757 
2758 		errcode = pthread_mutex_lock(&tog_mutex);
2759 		if (errcode) {
2760 			err = got_error_set_errno(errcode,
2761 			    "pthread_mutex_lock");
2762 			goto done;
2763 		} else if (*a->quit)
2764 			done = 1;
2765 		else if (*a->first_displayed_entry == NULL) {
2766 			*a->first_displayed_entry =
2767 			    TAILQ_FIRST(&a->commits->head);
2768 			*a->selected_entry = *a->first_displayed_entry;
2769 		}
2770 
2771 		errcode = pthread_cond_signal(&a->commit_loaded);
2772 		if (errcode) {
2773 			err = got_error_set_errno(errcode,
2774 			    "pthread_cond_signal");
2775 			pthread_mutex_unlock(&tog_mutex);
2776 			goto done;
2777 		}
2778 
2779 		if (done)
2780 			a->commits_needed = 0;
2781 		else {
2782 			if (a->commits_needed == 0 && !a->load_all) {
2783 				errcode = pthread_cond_wait(&a->need_commits,
2784 				    &tog_mutex);
2785 				if (errcode) {
2786 					err = got_error_set_errno(errcode,
2787 					    "pthread_cond_wait");
2788 					pthread_mutex_unlock(&tog_mutex);
2789 					goto done;
2790 				}
2791 				if (*a->quit)
2792 					done = 1;
2793 			}
2794 		}
2795 	}
2796 	a->log_complete = 1;
2797 	errcode = pthread_mutex_unlock(&tog_mutex);
2798 	if (errcode)
2799 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2800 done:
2801 	if (err) {
2802 		tog_thread_error = 1;
2803 		pthread_cond_signal(&a->commit_loaded);
2804 	}
2805 	return (void *)err;
2806 }
2807 
2808 static const struct got_error *
2809 stop_log_thread(struct tog_log_view_state *s)
2810 {
2811 	const struct got_error *err = NULL, *thread_err = NULL;
2812 	int errcode;
2813 
2814 	if (s->thread) {
2815 		s->quit = 1;
2816 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2817 		if (errcode)
2818 			return got_error_set_errno(errcode,
2819 			    "pthread_cond_signal");
2820 		errcode = pthread_mutex_unlock(&tog_mutex);
2821 		if (errcode)
2822 			return got_error_set_errno(errcode,
2823 			    "pthread_mutex_unlock");
2824 		errcode = pthread_join(s->thread, (void **)&thread_err);
2825 		if (errcode)
2826 			return got_error_set_errno(errcode, "pthread_join");
2827 		errcode = pthread_mutex_lock(&tog_mutex);
2828 		if (errcode)
2829 			return got_error_set_errno(errcode,
2830 			    "pthread_mutex_lock");
2831 		s->thread = 0; //NULL;
2832 	}
2833 
2834 	if (s->thread_args.repo) {
2835 		err = got_repo_close(s->thread_args.repo);
2836 		s->thread_args.repo = NULL;
2837 	}
2838 
2839 	if (s->thread_args.pack_fds) {
2840 		const struct got_error *pack_err =
2841 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2842 		if (err == NULL)
2843 			err = pack_err;
2844 		s->thread_args.pack_fds = NULL;
2845 	}
2846 
2847 	if (s->thread_args.graph) {
2848 		got_commit_graph_close(s->thread_args.graph);
2849 		s->thread_args.graph = NULL;
2850 	}
2851 
2852 	return err ? err : thread_err;
2853 }
2854 
2855 static const struct got_error *
2856 close_log_view(struct tog_view *view)
2857 {
2858 	const struct got_error *err = NULL;
2859 	struct tog_log_view_state *s = &view->state.log;
2860 	int errcode;
2861 
2862 	err = stop_log_thread(s);
2863 
2864 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2865 	if (errcode && err == NULL)
2866 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2867 
2868 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2869 	if (errcode && err == NULL)
2870 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2871 
2872 	free_commits(&s->commits);
2873 	free(s->in_repo_path);
2874 	s->in_repo_path = NULL;
2875 	free(s->start_id);
2876 	s->start_id = NULL;
2877 	free(s->head_ref_name);
2878 	s->head_ref_name = NULL;
2879 	return err;
2880 }
2881 
2882 static const struct got_error *
2883 search_start_log_view(struct tog_view *view)
2884 {
2885 	struct tog_log_view_state *s = &view->state.log;
2886 
2887 	s->matched_entry = NULL;
2888 	s->search_entry = NULL;
2889 	return NULL;
2890 }
2891 
2892 static const struct got_error *
2893 search_next_log_view(struct tog_view *view)
2894 {
2895 	const struct got_error *err = NULL;
2896 	struct tog_log_view_state *s = &view->state.log;
2897 	struct commit_queue_entry *entry;
2898 
2899 	/* Display progress update in log view. */
2900 	show_log_view(view);
2901 	update_panels();
2902 	doupdate();
2903 
2904 	if (s->search_entry) {
2905 		int errcode, ch;
2906 		errcode = pthread_mutex_unlock(&tog_mutex);
2907 		if (errcode)
2908 			return got_error_set_errno(errcode,
2909 			    "pthread_mutex_unlock");
2910 		ch = wgetch(view->window);
2911 		errcode = pthread_mutex_lock(&tog_mutex);
2912 		if (errcode)
2913 			return got_error_set_errno(errcode,
2914 			    "pthread_mutex_lock");
2915 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2916 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2917 			return NULL;
2918 		}
2919 		if (view->searching == TOG_SEARCH_FORWARD)
2920 			entry = TAILQ_NEXT(s->search_entry, entry);
2921 		else
2922 			entry = TAILQ_PREV(s->search_entry,
2923 			    commit_queue_head, entry);
2924 	} else if (s->matched_entry) {
2925 		int matched_idx = s->matched_entry->idx;
2926 		int selected_idx = s->selected_entry->idx;
2927 
2928 		/*
2929 		 * If the user has moved the cursor after we hit a match,
2930 		 * the position from where we should continue searching
2931 		 * might have changed.
2932 		 */
2933 		if (view->searching == TOG_SEARCH_FORWARD) {
2934 			if (matched_idx > selected_idx)
2935 				entry = TAILQ_NEXT(s->selected_entry, entry);
2936 			else
2937 				entry = TAILQ_NEXT(s->matched_entry, entry);
2938 		} else {
2939 			if (matched_idx < selected_idx)
2940 				entry = TAILQ_PREV(s->selected_entry,
2941 						commit_queue_head, entry);
2942 			else
2943 				entry = TAILQ_PREV(s->matched_entry,
2944 						commit_queue_head, entry);
2945 		}
2946 	} else {
2947 		entry = s->selected_entry;
2948 	}
2949 
2950 	while (1) {
2951 		int have_match = 0;
2952 
2953 		if (entry == NULL) {
2954 			if (s->thread_args.log_complete ||
2955 			    view->searching == TOG_SEARCH_BACKWARD) {
2956 				view->search_next_done =
2957 				    (s->matched_entry == NULL ?
2958 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2959 				s->search_entry = NULL;
2960 				return NULL;
2961 			}
2962 			/*
2963 			 * Poke the log thread for more commits and return,
2964 			 * allowing the main loop to make progress. Search
2965 			 * will resume at s->search_entry once we come back.
2966 			 */
2967 			s->thread_args.commits_needed++;
2968 			return trigger_log_thread(view, 0);
2969 		}
2970 
2971 		err = match_commit(&have_match, entry->id, entry->commit,
2972 		    &view->regex);
2973 		if (err)
2974 			break;
2975 		if (have_match) {
2976 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2977 			s->matched_entry = entry;
2978 			break;
2979 		}
2980 
2981 		s->search_entry = entry;
2982 		if (view->searching == TOG_SEARCH_FORWARD)
2983 			entry = TAILQ_NEXT(entry, entry);
2984 		else
2985 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2986 	}
2987 
2988 	if (s->matched_entry) {
2989 		int cur = s->selected_entry->idx;
2990 		while (cur < s->matched_entry->idx) {
2991 			err = input_log_view(NULL, view, KEY_DOWN);
2992 			if (err)
2993 				return err;
2994 			cur++;
2995 		}
2996 		while (cur > s->matched_entry->idx) {
2997 			err = input_log_view(NULL, view, KEY_UP);
2998 			if (err)
2999 				return err;
3000 			cur--;
3001 		}
3002 	}
3003 
3004 	s->search_entry = NULL;
3005 
3006 	return NULL;
3007 }
3008 
3009 static const struct got_error *
3010 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3011     struct got_repository *repo, const char *head_ref_name,
3012     const char *in_repo_path, int log_branches)
3013 {
3014 	const struct got_error *err = NULL;
3015 	struct tog_log_view_state *s = &view->state.log;
3016 	struct got_repository *thread_repo = NULL;
3017 	struct got_commit_graph *thread_graph = NULL;
3018 	int errcode;
3019 
3020 	if (in_repo_path != s->in_repo_path) {
3021 		free(s->in_repo_path);
3022 		s->in_repo_path = strdup(in_repo_path);
3023 		if (s->in_repo_path == NULL)
3024 			return got_error_from_errno("strdup");
3025 	}
3026 
3027 	/* The commit queue only contains commits being displayed. */
3028 	TAILQ_INIT(&s->commits.head);
3029 	s->commits.ncommits = 0;
3030 
3031 	s->repo = repo;
3032 	if (head_ref_name) {
3033 		s->head_ref_name = strdup(head_ref_name);
3034 		if (s->head_ref_name == NULL) {
3035 			err = got_error_from_errno("strdup");
3036 			goto done;
3037 		}
3038 	}
3039 	s->start_id = got_object_id_dup(start_id);
3040 	if (s->start_id == NULL) {
3041 		err = got_error_from_errno("got_object_id_dup");
3042 		goto done;
3043 	}
3044 	s->log_branches = log_branches;
3045 
3046 	STAILQ_INIT(&s->colors);
3047 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3048 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3049 		    get_color_value("TOG_COLOR_COMMIT"));
3050 		if (err)
3051 			goto done;
3052 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3053 		    get_color_value("TOG_COLOR_AUTHOR"));
3054 		if (err) {
3055 			free_colors(&s->colors);
3056 			goto done;
3057 		}
3058 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3059 		    get_color_value("TOG_COLOR_DATE"));
3060 		if (err) {
3061 			free_colors(&s->colors);
3062 			goto done;
3063 		}
3064 	}
3065 
3066 	view->show = show_log_view;
3067 	view->input = input_log_view;
3068 	view->resize = resize_log_view;
3069 	view->close = close_log_view;
3070 	view->search_start = search_start_log_view;
3071 	view->search_next = search_next_log_view;
3072 
3073 	if (s->thread_args.pack_fds == NULL) {
3074 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3075 		if (err)
3076 			goto done;
3077 	}
3078 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3079 	    s->thread_args.pack_fds);
3080 	if (err)
3081 		goto done;
3082 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3083 	    !s->log_branches);
3084 	if (err)
3085 		goto done;
3086 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3087 	    s->repo, NULL, NULL);
3088 	if (err)
3089 		goto done;
3090 
3091 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3092 	if (errcode) {
3093 		err = got_error_set_errno(errcode, "pthread_cond_init");
3094 		goto done;
3095 	}
3096 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3097 	if (errcode) {
3098 		err = got_error_set_errno(errcode, "pthread_cond_init");
3099 		goto done;
3100 	}
3101 
3102 	s->thread_args.commits_needed = view->nlines;
3103 	s->thread_args.graph = thread_graph;
3104 	s->thread_args.commits = &s->commits;
3105 	s->thread_args.in_repo_path = s->in_repo_path;
3106 	s->thread_args.start_id = s->start_id;
3107 	s->thread_args.repo = thread_repo;
3108 	s->thread_args.log_complete = 0;
3109 	s->thread_args.quit = &s->quit;
3110 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3111 	s->thread_args.selected_entry = &s->selected_entry;
3112 	s->thread_args.searching = &view->searching;
3113 	s->thread_args.search_next_done = &view->search_next_done;
3114 	s->thread_args.regex = &view->regex;
3115 done:
3116 	if (err)
3117 		close_log_view(view);
3118 	return err;
3119 }
3120 
3121 static const struct got_error *
3122 show_log_view(struct tog_view *view)
3123 {
3124 	const struct got_error *err;
3125 	struct tog_log_view_state *s = &view->state.log;
3126 
3127 	if (s->thread == 0) { //NULL) {
3128 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3129 		    &s->thread_args);
3130 		if (errcode)
3131 			return got_error_set_errno(errcode, "pthread_create");
3132 		if (s->thread_args.commits_needed > 0) {
3133 			err = trigger_log_thread(view, 1);
3134 			if (err)
3135 				return err;
3136 		}
3137 	}
3138 
3139 	return draw_commits(view);
3140 }
3141 
3142 static void
3143 log_move_cursor_up(struct tog_view *view, int page, int home)
3144 {
3145 	struct tog_log_view_state *s = &view->state.log;
3146 
3147 	if (s->selected_entry->idx == 0)
3148 		view->count = 0;
3149 	if (s->first_displayed_entry == NULL)
3150 		return;
3151 
3152 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3153 	    || home)
3154 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3155 
3156 	if (!page && !home && s->selected > 0)
3157 		--s->selected;
3158 	else
3159 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3160 
3161 	select_commit(s);
3162 	return;
3163 }
3164 
3165 static const struct got_error *
3166 log_move_cursor_down(struct tog_view *view, int page)
3167 {
3168 	struct tog_log_view_state	*s = &view->state.log;
3169 	struct commit_queue_entry	*first;
3170 	const struct got_error		*err = NULL;
3171 
3172 	first = s->first_displayed_entry;
3173 	if (first == NULL) {
3174 		view->count = 0;
3175 		return NULL;
3176 	}
3177 
3178 	if (s->thread_args.log_complete &&
3179 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3180 		return NULL;
3181 
3182 	if (!page) {
3183 		int eos = view->nlines - 2;
3184 
3185 		if (view_is_hsplit_top(view))
3186 			--eos;  /* border consumes the last line */
3187 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3188 			++s->selected;
3189 		else
3190 			err = log_scroll_down(view, 1);
3191 	} else if (s->thread_args.load_all) {
3192 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3193 			s->selected += MIN(s->last_displayed_entry->idx -
3194 			    s->selected_entry->idx, page + 1);
3195 		else
3196 			err = log_scroll_down(view, MIN(page,
3197 			    s->commits.ncommits - s->selected_entry->idx - 1));
3198 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3199 	} else {
3200 		err = log_scroll_down(view, page);
3201 		if (err)
3202 			return err;
3203 		if (first == s->first_displayed_entry && s->selected <
3204 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3205 			s->selected = MIN(s->commits.ncommits - 1, page);
3206 		}
3207 	}
3208 	if (err)
3209 		return err;
3210 
3211 	/*
3212 	 * We might necessarily overshoot in horizontal
3213 	 * splits; if so, select the last displayed commit.
3214 	 */
3215 	s->selected = MIN(s->selected,
3216 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3217 
3218 	select_commit(s);
3219 
3220 	if (s->thread_args.log_complete &&
3221 	    s->selected_entry->idx == s->commits.ncommits - 1)
3222 		view->count = 0;
3223 
3224 	return NULL;
3225 }
3226 
3227 static void
3228 view_get_split(struct tog_view *view, int *y, int *x)
3229 {
3230 	*x = 0;
3231 	*y = 0;
3232 
3233 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3234 		if (view->child && view->child->resized_y)
3235 			*y = view->child->resized_y;
3236 		else if (view->resized_y)
3237 			*y = view->resized_y;
3238 		else
3239 			*y = view_split_begin_y(view->lines);
3240 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3241 		if (view->child && view->child->resized_x)
3242 			*x = view->child->resized_x;
3243 		else if (view->resized_x)
3244 			*x = view->resized_x;
3245 		else
3246 			*x = view_split_begin_x(view->begin_x);
3247 	}
3248 }
3249 
3250 /* Split view horizontally at y and offset view->state->selected line. */
3251 static const struct got_error *
3252 view_init_hsplit(struct tog_view *view, int y)
3253 {
3254 	const struct got_error *err = NULL;
3255 
3256 	view->nlines = y;
3257 	view->ncols = COLS;
3258 	err = view_resize(view);
3259 	if (err)
3260 		return err;
3261 
3262 	err = offset_selection_down(view);
3263 
3264 	return err;
3265 }
3266 
3267 static const struct got_error *
3268 log_goto_line(struct tog_view *view, int nlines)
3269 {
3270 	const struct got_error		*err = NULL;
3271 	struct tog_log_view_state	*s = &view->state.log;
3272 	int				 g, idx = s->selected_entry->idx;
3273 
3274 	g = view->gline;
3275 	view->gline = 0;
3276 
3277 	if (g >= s->first_displayed_entry->idx + 1 &&
3278 	    g <= s->last_displayed_entry->idx + 1 &&
3279 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3280 		s->selected = g - s->first_displayed_entry->idx - 1;
3281 		select_commit(s);
3282 		return NULL;
3283 	}
3284 
3285 	if (idx + 1 < g) {
3286 		err = log_move_cursor_down(view, g - idx - 1);
3287 		if (!err && g > s->selected_entry->idx + 1)
3288 			err = log_move_cursor_down(view,
3289 			    g - s->first_displayed_entry->idx - 1);
3290 		if (err)
3291 			return err;
3292 	} else if (idx + 1 > g)
3293 		log_move_cursor_up(view, idx - g + 1, 0);
3294 
3295 	if (g < nlines && s->first_displayed_entry->idx == 0)
3296 		s->selected = g - 1;
3297 
3298 	select_commit(s);
3299 	return NULL;
3300 
3301 }
3302 
3303 static const struct got_error *
3304 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3305 {
3306 	const struct got_error *err = NULL;
3307 	struct tog_log_view_state *s = &view->state.log;
3308 	struct commit_queue_entry *entry;
3309 	int eos, n, nscroll;
3310 
3311 	if (s->thread_args.load_all) {
3312 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3313 			s->thread_args.load_all = 0;
3314 		else if (s->thread_args.log_complete) {
3315 			err = log_move_cursor_down(view, s->commits.ncommits);
3316 			s->thread_args.load_all = 0;
3317 		}
3318 		return err;
3319 	}
3320 
3321 	eos = nscroll = view->nlines - 1;
3322 	if (view_is_hsplit_top(view))
3323 		--eos;  /* border */
3324 
3325 	if (view->gline)
3326 		return log_goto_line(view, eos);
3327 
3328 	switch (ch) {
3329 	case 'q':
3330 		s->quit = 1;
3331 		break;
3332 	case '0':
3333 		view->x = 0;
3334 		break;
3335 	case '$':
3336 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3337 		view->count = 0;
3338 		break;
3339 	case KEY_RIGHT:
3340 	case 'l':
3341 		if (view->x + view->ncols / 2 < view->maxx)
3342 			view->x += 2;  /* move two columns right */
3343 		else
3344 			view->count = 0;
3345 		break;
3346 	case KEY_LEFT:
3347 	case 'h':
3348 		view->x -= MIN(view->x, 2);  /* move two columns back */
3349 		if (view->x <= 0)
3350 			view->count = 0;
3351 		break;
3352 	case 'k':
3353 	case KEY_UP:
3354 	case '<':
3355 	case ',':
3356 	case CTRL('p'):
3357 		log_move_cursor_up(view, 0, 0);
3358 		break;
3359 	case 'g':
3360 	case KEY_HOME:
3361 		log_move_cursor_up(view, 0, 1);
3362 		view->count = 0;
3363 		break;
3364 	case CTRL('u'):
3365 	case 'u':
3366 		nscroll /= 2;
3367 		/* FALL THROUGH */
3368 	case KEY_PPAGE:
3369 	case CTRL('b'):
3370 	case 'b':
3371 		log_move_cursor_up(view, nscroll, 0);
3372 		break;
3373 	case 'j':
3374 	case KEY_DOWN:
3375 	case '>':
3376 	case '.':
3377 	case CTRL('n'):
3378 		err = log_move_cursor_down(view, 0);
3379 		break;
3380 	case '@':
3381 		s->use_committer = !s->use_committer;
3382 		break;
3383 	case 'G':
3384 	case KEY_END: {
3385 		/* We don't know yet how many commits, so we're forced to
3386 		 * traverse them all. */
3387 		view->count = 0;
3388 		if (!s->thread_args.log_complete) {
3389 			s->thread_args.load_all = 1;
3390 			return trigger_log_thread(view, 0);
3391 		}
3392 
3393 		s->selected = 0;
3394 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3395 		for (n = 0; n < eos; n++) {
3396 			if (entry == NULL)
3397 				break;
3398 			s->first_displayed_entry = entry;
3399 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3400 		}
3401 		if (n > 0)
3402 			s->selected = n - 1;
3403 		select_commit(s);
3404 		break;
3405 	}
3406 	case CTRL('d'):
3407 	case 'd':
3408 		nscroll /= 2;
3409 		/* FALL THROUGH */
3410 	case KEY_NPAGE:
3411 	case CTRL('f'):
3412 	case 'f':
3413 	case ' ':
3414 		err = log_move_cursor_down(view, nscroll);
3415 		break;
3416 	case KEY_RESIZE:
3417 		if (s->selected > view->nlines - 2)
3418 			s->selected = view->nlines - 2;
3419 		if (s->selected > s->commits.ncommits - 1)
3420 			s->selected = s->commits.ncommits - 1;
3421 		select_commit(s);
3422 		if (s->commits.ncommits < view->nlines - 1 &&
3423 		    !s->thread_args.log_complete) {
3424 			s->thread_args.commits_needed += (view->nlines - 1) -
3425 			    s->commits.ncommits;
3426 			err = trigger_log_thread(view, 1);
3427 		}
3428 		break;
3429 	case KEY_ENTER:
3430 	case '\r':
3431 		view->count = 0;
3432 		if (s->selected_entry == NULL)
3433 			break;
3434 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3435 		break;
3436 	case 'T':
3437 		view->count = 0;
3438 		if (s->selected_entry == NULL)
3439 			break;
3440 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3441 		break;
3442 	case KEY_BACKSPACE:
3443 	case CTRL('l'):
3444 	case 'B':
3445 		view->count = 0;
3446 		if (ch == KEY_BACKSPACE &&
3447 		    got_path_is_root_dir(s->in_repo_path))
3448 			break;
3449 		err = stop_log_thread(s);
3450 		if (err)
3451 			return err;
3452 		if (ch == KEY_BACKSPACE) {
3453 			char *parent_path;
3454 			err = got_path_dirname(&parent_path, s->in_repo_path);
3455 			if (err)
3456 				return err;
3457 			free(s->in_repo_path);
3458 			s->in_repo_path = parent_path;
3459 			s->thread_args.in_repo_path = s->in_repo_path;
3460 		} else if (ch == CTRL('l')) {
3461 			struct got_object_id *start_id;
3462 			err = got_repo_match_object_id(&start_id, NULL,
3463 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3464 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3465 			if (err)
3466 				return err;
3467 			free(s->start_id);
3468 			s->start_id = start_id;
3469 			s->thread_args.start_id = s->start_id;
3470 		} else /* 'B' */
3471 			s->log_branches = !s->log_branches;
3472 
3473 		if (s->thread_args.pack_fds == NULL) {
3474 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3475 			if (err)
3476 				return err;
3477 		}
3478 		err = got_repo_open(&s->thread_args.repo,
3479 		    got_repo_get_path(s->repo), NULL,
3480 		    s->thread_args.pack_fds);
3481 		if (err)
3482 			return err;
3483 		tog_free_refs();
3484 		err = tog_load_refs(s->repo, 0);
3485 		if (err)
3486 			return err;
3487 		err = got_commit_graph_open(&s->thread_args.graph,
3488 		    s->in_repo_path, !s->log_branches);
3489 		if (err)
3490 			return err;
3491 		err = got_commit_graph_iter_start(s->thread_args.graph,
3492 		    s->start_id, s->repo, NULL, NULL);
3493 		if (err)
3494 			return err;
3495 		free_commits(&s->commits);
3496 		s->first_displayed_entry = NULL;
3497 		s->last_displayed_entry = NULL;
3498 		s->selected_entry = NULL;
3499 		s->selected = 0;
3500 		s->thread_args.log_complete = 0;
3501 		s->quit = 0;
3502 		s->thread_args.commits_needed = view->lines;
3503 		s->matched_entry = NULL;
3504 		s->search_entry = NULL;
3505 		view->offset = 0;
3506 		break;
3507 	case 'R':
3508 		view->count = 0;
3509 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3510 		break;
3511 	default:
3512 		view->count = 0;
3513 		break;
3514 	}
3515 
3516 	return err;
3517 }
3518 
3519 static const struct got_error *
3520 apply_unveil(const char *repo_path, const char *worktree_path)
3521 {
3522 	const struct got_error *error;
3523 
3524 #ifdef PROFILE
3525 	if (unveil("gmon.out", "rwc") != 0)
3526 		return got_error_from_errno2("unveil", "gmon.out");
3527 #endif
3528 	if (repo_path && unveil(repo_path, "r") != 0)
3529 		return got_error_from_errno2("unveil", repo_path);
3530 
3531 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3532 		return got_error_from_errno2("unveil", worktree_path);
3533 
3534 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3535 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3536 
3537 	error = got_privsep_unveil_exec_helpers();
3538 	if (error != NULL)
3539 		return error;
3540 
3541 	if (unveil(NULL, NULL) != 0)
3542 		return got_error_from_errno("unveil");
3543 
3544 	return NULL;
3545 }
3546 
3547 static void
3548 init_curses(void)
3549 {
3550 	/*
3551 	 * Override default signal handlers before starting ncurses.
3552 	 * This should prevent ncurses from installing its own
3553 	 * broken cleanup() signal handler.
3554 	 */
3555 	signal(SIGWINCH, tog_sigwinch);
3556 	signal(SIGPIPE, tog_sigpipe);
3557 	signal(SIGCONT, tog_sigcont);
3558 	signal(SIGINT, tog_sigint);
3559 	signal(SIGTERM, tog_sigterm);
3560 
3561 	initscr();
3562 	cbreak();
3563 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3564 	noecho();
3565 	nonl();
3566 	intrflush(stdscr, FALSE);
3567 	keypad(stdscr, TRUE);
3568 	curs_set(0);
3569 	if (getenv("TOG_COLORS") != NULL) {
3570 		start_color();
3571 		use_default_colors();
3572 	}
3573 }
3574 
3575 static const struct got_error *
3576 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3577     struct got_repository *repo, struct got_worktree *worktree)
3578 {
3579 	const struct got_error *err = NULL;
3580 
3581 	if (argc == 0) {
3582 		*in_repo_path = strdup("/");
3583 		if (*in_repo_path == NULL)
3584 			return got_error_from_errno("strdup");
3585 		return NULL;
3586 	}
3587 
3588 	if (worktree) {
3589 		const char *prefix = got_worktree_get_path_prefix(worktree);
3590 		char *p;
3591 
3592 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3593 		if (err)
3594 			return err;
3595 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3596 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3597 		    p) == -1) {
3598 			err = got_error_from_errno("asprintf");
3599 			*in_repo_path = NULL;
3600 		}
3601 		free(p);
3602 	} else
3603 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3604 
3605 	return err;
3606 }
3607 
3608 static const struct got_error *
3609 cmd_log(int argc, char *argv[])
3610 {
3611 	const struct got_error *error;
3612 	struct got_repository *repo = NULL;
3613 	struct got_worktree *worktree = NULL;
3614 	struct got_object_id *start_id = NULL;
3615 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3616 	char *start_commit = NULL, *label = NULL;
3617 	struct got_reference *ref = NULL;
3618 	const char *head_ref_name = NULL;
3619 	int ch, log_branches = 0;
3620 	struct tog_view *view;
3621 	int *pack_fds = NULL;
3622 
3623 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3624 		switch (ch) {
3625 		case 'b':
3626 			log_branches = 1;
3627 			break;
3628 		case 'c':
3629 			start_commit = optarg;
3630 			break;
3631 		case 'r':
3632 			repo_path = realpath(optarg, NULL);
3633 			if (repo_path == NULL)
3634 				return got_error_from_errno2("realpath",
3635 				    optarg);
3636 			break;
3637 		default:
3638 			usage_log();
3639 			/* NOTREACHED */
3640 		}
3641 	}
3642 
3643 	argc -= optind;
3644 	argv += optind;
3645 
3646 	if (argc > 1)
3647 		usage_log();
3648 
3649 	error = got_repo_pack_fds_open(&pack_fds);
3650 	if (error != NULL)
3651 		goto done;
3652 
3653 	if (repo_path == NULL) {
3654 		cwd = getcwd(NULL, 0);
3655 		if (cwd == NULL)
3656 			return got_error_from_errno("getcwd");
3657 		error = got_worktree_open(&worktree, cwd);
3658 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3659 			goto done;
3660 		if (worktree)
3661 			repo_path =
3662 			    strdup(got_worktree_get_repo_path(worktree));
3663 		else
3664 			repo_path = strdup(cwd);
3665 		if (repo_path == NULL) {
3666 			error = got_error_from_errno("strdup");
3667 			goto done;
3668 		}
3669 	}
3670 
3671 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3672 	if (error != NULL)
3673 		goto done;
3674 
3675 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3676 	    repo, worktree);
3677 	if (error)
3678 		goto done;
3679 
3680 	init_curses();
3681 
3682 	error = apply_unveil(got_repo_get_path(repo),
3683 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3684 	if (error)
3685 		goto done;
3686 
3687 	/* already loaded by tog_log_with_path()? */
3688 	if (TAILQ_EMPTY(&tog_refs)) {
3689 		error = tog_load_refs(repo, 0);
3690 		if (error)
3691 			goto done;
3692 	}
3693 
3694 	if (start_commit == NULL) {
3695 		error = got_repo_match_object_id(&start_id, &label,
3696 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3697 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3698 		if (error)
3699 			goto done;
3700 		head_ref_name = label;
3701 	} else {
3702 		error = got_ref_open(&ref, repo, start_commit, 0);
3703 		if (error == NULL)
3704 			head_ref_name = got_ref_get_name(ref);
3705 		else if (error->code != GOT_ERR_NOT_REF)
3706 			goto done;
3707 		error = got_repo_match_object_id(&start_id, NULL,
3708 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3709 		if (error)
3710 			goto done;
3711 	}
3712 
3713 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3714 	if (view == NULL) {
3715 		error = got_error_from_errno("view_open");
3716 		goto done;
3717 	}
3718 	error = open_log_view(view, start_id, repo, head_ref_name,
3719 	    in_repo_path, log_branches);
3720 	if (error)
3721 		goto done;
3722 	if (worktree) {
3723 		/* Release work tree lock. */
3724 		got_worktree_close(worktree);
3725 		worktree = NULL;
3726 	}
3727 	error = view_loop(view);
3728 done:
3729 	free(in_repo_path);
3730 	free(repo_path);
3731 	free(cwd);
3732 	free(start_id);
3733 	free(label);
3734 	if (ref)
3735 		got_ref_close(ref);
3736 	if (repo) {
3737 		const struct got_error *close_err = got_repo_close(repo);
3738 		if (error == NULL)
3739 			error = close_err;
3740 	}
3741 	if (worktree)
3742 		got_worktree_close(worktree);
3743 	if (pack_fds) {
3744 		const struct got_error *pack_err =
3745 		    got_repo_pack_fds_close(pack_fds);
3746 		if (error == NULL)
3747 			error = pack_err;
3748 	}
3749 	tog_free_refs();
3750 	return error;
3751 }
3752 
3753 __dead static void
3754 usage_diff(void)
3755 {
3756 	endwin();
3757 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3758 	    "[-w] object1 object2\n", getprogname());
3759 	exit(1);
3760 }
3761 
3762 static int
3763 match_line(const char *line, regex_t *regex, size_t nmatch,
3764     regmatch_t *regmatch)
3765 {
3766 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3767 }
3768 
3769 static struct tog_color *
3770 match_color(struct tog_colors *colors, const char *line)
3771 {
3772 	struct tog_color *tc = NULL;
3773 
3774 	STAILQ_FOREACH(tc, colors, entry) {
3775 		if (match_line(line, &tc->regex, 0, NULL))
3776 			return tc;
3777 	}
3778 
3779 	return NULL;
3780 }
3781 
3782 static const struct got_error *
3783 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3784     WINDOW *window, int skipcol, regmatch_t *regmatch)
3785 {
3786 	const struct got_error *err = NULL;
3787 	char *exstr = NULL;
3788 	wchar_t *wline = NULL;
3789 	int rme, rms, n, width, scrollx;
3790 	int width0 = 0, width1 = 0, width2 = 0;
3791 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3792 
3793 	*wtotal = 0;
3794 
3795 	rms = regmatch->rm_so;
3796 	rme = regmatch->rm_eo;
3797 
3798 	err = expand_tab(&exstr, line);
3799 	if (err)
3800 		return err;
3801 
3802 	/* Split the line into 3 segments, according to match offsets. */
3803 	seg0 = strndup(exstr, rms);
3804 	if (seg0 == NULL) {
3805 		err = got_error_from_errno("strndup");
3806 		goto done;
3807 	}
3808 	seg1 = strndup(exstr + rms, rme - rms);
3809 	if (seg1 == NULL) {
3810 		err = got_error_from_errno("strndup");
3811 		goto done;
3812 	}
3813 	seg2 = strdup(exstr + rme);
3814 	if (seg2 == NULL) {
3815 		err = got_error_from_errno("strndup");
3816 		goto done;
3817 	}
3818 
3819 	/* draw up to matched token if we haven't scrolled past it */
3820 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3821 	    col_tab_align, 1);
3822 	if (err)
3823 		goto done;
3824 	n = MAX(width0 - skipcol, 0);
3825 	if (n) {
3826 		free(wline);
3827 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3828 		    wlimit, col_tab_align, 1);
3829 		if (err)
3830 			goto done;
3831 		waddwstr(window, &wline[scrollx]);
3832 		wlimit -= width;
3833 		*wtotal += width;
3834 	}
3835 
3836 	if (wlimit > 0) {
3837 		int i = 0, w = 0;
3838 		size_t wlen;
3839 
3840 		free(wline);
3841 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3842 		    col_tab_align, 1);
3843 		if (err)
3844 			goto done;
3845 		wlen = wcslen(wline);
3846 		while (i < wlen) {
3847 			width = wcwidth(wline[i]);
3848 			if (width == -1) {
3849 				/* should not happen, tabs are expanded */
3850 				err = got_error(GOT_ERR_RANGE);
3851 				goto done;
3852 			}
3853 			if (width0 + w + width > skipcol)
3854 				break;
3855 			w += width;
3856 			i++;
3857 		}
3858 		/* draw (visible part of) matched token (if scrolled into it) */
3859 		if (width1 - w > 0) {
3860 			wattron(window, A_STANDOUT);
3861 			waddwstr(window, &wline[i]);
3862 			wattroff(window, A_STANDOUT);
3863 			wlimit -= (width1 - w);
3864 			*wtotal += (width1 - w);
3865 		}
3866 	}
3867 
3868 	if (wlimit > 0) {  /* draw rest of line */
3869 		free(wline);
3870 		if (skipcol > width0 + width1) {
3871 			err = format_line(&wline, &width2, &scrollx, seg2,
3872 			    skipcol - (width0 + width1), wlimit,
3873 			    col_tab_align, 1);
3874 			if (err)
3875 				goto done;
3876 			waddwstr(window, &wline[scrollx]);
3877 		} else {
3878 			err = format_line(&wline, &width2, NULL, seg2, 0,
3879 			    wlimit, col_tab_align, 1);
3880 			if (err)
3881 				goto done;
3882 			waddwstr(window, wline);
3883 		}
3884 		*wtotal += width2;
3885 	}
3886 done:
3887 	free(wline);
3888 	free(exstr);
3889 	free(seg0);
3890 	free(seg1);
3891 	free(seg2);
3892 	return err;
3893 }
3894 
3895 static int
3896 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3897 {
3898 	FILE	*f = NULL;
3899 	int	*eof, *first, *selected;
3900 
3901 	if (view->type == TOG_VIEW_DIFF) {
3902 		struct tog_diff_view_state *s = &view->state.diff;
3903 
3904 		first = &s->first_displayed_line;
3905 		selected = first;
3906 		eof = &s->eof;
3907 		f = s->f;
3908 	} else if (view->type == TOG_VIEW_BLAME) {
3909 		struct tog_blame_view_state *s = &view->state.blame;
3910 
3911 		first = &s->first_displayed_line;
3912 		selected = &s->selected_line;
3913 		eof = &s->eof;
3914 		f = s->blame.f;
3915 	} else
3916 		return 0;
3917 
3918 	/* Center gline in the middle of the page like vi(1). */
3919 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3920 		return 0;
3921 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3922 		rewind(f);
3923 		*eof = 0;
3924 		*first = 1;
3925 		*lineno = 0;
3926 		*nprinted = 0;
3927 		return 0;
3928 	}
3929 
3930 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3931 		view->gline : (view->nlines - 3) / 2 + 1;
3932 	view->gline = 0;
3933 
3934 	return 1;
3935 }
3936 
3937 static const struct got_error *
3938 draw_file(struct tog_view *view, const char *header)
3939 {
3940 	struct tog_diff_view_state *s = &view->state.diff;
3941 	regmatch_t *regmatch = &view->regmatch;
3942 	const struct got_error *err;
3943 	int nprinted = 0;
3944 	char *line;
3945 	size_t linesize = 0;
3946 	ssize_t linelen;
3947 	wchar_t *wline;
3948 	int width;
3949 	int max_lines = view->nlines;
3950 	int nlines = s->nlines;
3951 	off_t line_offset;
3952 
3953 	s->lineno = s->first_displayed_line - 1;
3954 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3955 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3956 		return got_error_from_errno("fseek");
3957 
3958 	werase(view->window);
3959 
3960 	if (view->gline > s->nlines - 1)
3961 		view->gline = s->nlines - 1;
3962 
3963 	if (header) {
3964 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3965 		    1 : view->gline - (view->nlines - 3) / 2 :
3966 		    s->lineno + s->selected_line;
3967 
3968 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3969 			return got_error_from_errno("asprintf");
3970 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3971 		    0, 0);
3972 		free(line);
3973 		if (err)
3974 			return err;
3975 
3976 		if (view_needs_focus_indication(view))
3977 			wstandout(view->window);
3978 		waddwstr(view->window, wline);
3979 		free(wline);
3980 		wline = NULL;
3981 		if (view_needs_focus_indication(view))
3982 			wstandend(view->window);
3983 		if (width <= view->ncols - 1)
3984 			waddch(view->window, '\n');
3985 
3986 		if (max_lines <= 1)
3987 			return NULL;
3988 		max_lines--;
3989 	}
3990 
3991 	s->eof = 0;
3992 	view->maxx = 0;
3993 	line = NULL;
3994 	while (max_lines > 0 && nprinted < max_lines) {
3995 		enum got_diff_line_type linetype;
3996 		attr_t attr = 0;
3997 
3998 		linelen = getline(&line, &linesize, s->f);
3999 		if (linelen == -1) {
4000 			if (feof(s->f)) {
4001 				s->eof = 1;
4002 				break;
4003 			}
4004 			free(line);
4005 			return got_ferror(s->f, GOT_ERR_IO);
4006 		}
4007 
4008 		if (++s->lineno < s->first_displayed_line)
4009 			continue;
4010 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4011 			continue;
4012 		if (s->lineno == view->hiline)
4013 			attr = A_STANDOUT;
4014 
4015 		/* Set view->maxx based on full line length. */
4016 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4017 		    view->x ? 1 : 0);
4018 		if (err) {
4019 			free(line);
4020 			return err;
4021 		}
4022 		view->maxx = MAX(view->maxx, width);
4023 		free(wline);
4024 		wline = NULL;
4025 
4026 		linetype = s->lines[s->lineno].type;
4027 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4028 		    linetype < GOT_DIFF_LINE_CONTEXT)
4029 			attr |= COLOR_PAIR(linetype);
4030 		if (attr)
4031 			wattron(view->window, attr);
4032 		if (s->first_displayed_line + nprinted == s->matched_line &&
4033 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4034 			err = add_matched_line(&width, line, view->ncols, 0,
4035 			    view->window, view->x, regmatch);
4036 			if (err) {
4037 				free(line);
4038 				return err;
4039 			}
4040 		} else {
4041 			int skip;
4042 			err = format_line(&wline, &width, &skip, line,
4043 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4044 			if (err) {
4045 				free(line);
4046 				return err;
4047 			}
4048 			waddwstr(view->window, &wline[skip]);
4049 			free(wline);
4050 			wline = NULL;
4051 		}
4052 		if (s->lineno == view->hiline) {
4053 			/* highlight full gline length */
4054 			while (width++ < view->ncols)
4055 				waddch(view->window, ' ');
4056 		} else {
4057 			if (width <= view->ncols - 1)
4058 				waddch(view->window, '\n');
4059 		}
4060 		if (attr)
4061 			wattroff(view->window, attr);
4062 		if (++nprinted == 1)
4063 			s->first_displayed_line = s->lineno;
4064 	}
4065 	free(line);
4066 	if (nprinted >= 1)
4067 		s->last_displayed_line = s->first_displayed_line +
4068 		    (nprinted - 1);
4069 	else
4070 		s->last_displayed_line = s->first_displayed_line;
4071 
4072 	view_border(view);
4073 
4074 	if (s->eof) {
4075 		while (nprinted < view->nlines) {
4076 			waddch(view->window, '\n');
4077 			nprinted++;
4078 		}
4079 
4080 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4081 		    view->ncols, 0, 0);
4082 		if (err) {
4083 			return err;
4084 		}
4085 
4086 		wstandout(view->window);
4087 		waddwstr(view->window, wline);
4088 		free(wline);
4089 		wline = NULL;
4090 		wstandend(view->window);
4091 	}
4092 
4093 	return NULL;
4094 }
4095 
4096 static char *
4097 get_datestr(time_t *time, char *datebuf)
4098 {
4099 	struct tm mytm, *tm;
4100 	char *p, *s;
4101 
4102 	tm = gmtime_r(time, &mytm);
4103 	if (tm == NULL)
4104 		return NULL;
4105 	s = asctime_r(tm, datebuf);
4106 	if (s == NULL)
4107 		return NULL;
4108 	p = strchr(s, '\n');
4109 	if (p)
4110 		*p = '\0';
4111 	return s;
4112 }
4113 
4114 static const struct got_error *
4115 get_changed_paths(struct got_pathlist_head *paths,
4116     struct got_commit_object *commit, struct got_repository *repo)
4117 {
4118 	const struct got_error *err = NULL;
4119 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4120 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4121 	struct got_object_qid *qid;
4122 
4123 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4124 	if (qid != NULL) {
4125 		struct got_commit_object *pcommit;
4126 		err = got_object_open_as_commit(&pcommit, repo,
4127 		    &qid->id);
4128 		if (err)
4129 			return err;
4130 
4131 		tree_id1 = got_object_id_dup(
4132 		    got_object_commit_get_tree_id(pcommit));
4133 		if (tree_id1 == NULL) {
4134 			got_object_commit_close(pcommit);
4135 			return got_error_from_errno("got_object_id_dup");
4136 		}
4137 		got_object_commit_close(pcommit);
4138 
4139 	}
4140 
4141 	if (tree_id1) {
4142 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4143 		if (err)
4144 			goto done;
4145 	}
4146 
4147 	tree_id2 = got_object_commit_get_tree_id(commit);
4148 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4149 	if (err)
4150 		goto done;
4151 
4152 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4153 	    got_diff_tree_collect_changed_paths, paths, 0);
4154 done:
4155 	if (tree1)
4156 		got_object_tree_close(tree1);
4157 	if (tree2)
4158 		got_object_tree_close(tree2);
4159 	free(tree_id1);
4160 	return err;
4161 }
4162 
4163 static const struct got_error *
4164 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4165     off_t off, uint8_t type)
4166 {
4167 	struct got_diff_line *p;
4168 
4169 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4170 	if (p == NULL)
4171 		return got_error_from_errno("reallocarray");
4172 	*lines = p;
4173 	(*lines)[*nlines].offset = off;
4174 	(*lines)[*nlines].type = type;
4175 	(*nlines)++;
4176 
4177 	return NULL;
4178 }
4179 
4180 static const struct got_error *
4181 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4182     struct got_object_id *commit_id, struct got_reflist_head *refs,
4183     struct got_repository *repo, FILE *outfile)
4184 {
4185 	const struct got_error *err = NULL;
4186 	char datebuf[26], *datestr;
4187 	struct got_commit_object *commit;
4188 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4189 	time_t committer_time;
4190 	const char *author, *committer;
4191 	char *refs_str = NULL;
4192 	struct got_pathlist_head changed_paths;
4193 	struct got_pathlist_entry *pe;
4194 	off_t outoff = 0;
4195 	int n;
4196 
4197 	TAILQ_INIT(&changed_paths);
4198 
4199 	if (refs) {
4200 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4201 		if (err)
4202 			return err;
4203 	}
4204 
4205 	err = got_object_open_as_commit(&commit, repo, commit_id);
4206 	if (err)
4207 		return err;
4208 
4209 	err = got_object_id_str(&id_str, commit_id);
4210 	if (err) {
4211 		err = got_error_from_errno("got_object_id_str");
4212 		goto done;
4213 	}
4214 
4215 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4216 	if (err)
4217 		goto done;
4218 
4219 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4220 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4221 	if (n < 0) {
4222 		err = got_error_from_errno("fprintf");
4223 		goto done;
4224 	}
4225 	outoff += n;
4226 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4227 	if (err)
4228 		goto done;
4229 
4230 	n = fprintf(outfile, "from: %s\n",
4231 	    got_object_commit_get_author(commit));
4232 	if (n < 0) {
4233 		err = got_error_from_errno("fprintf");
4234 		goto done;
4235 	}
4236 	outoff += n;
4237 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4238 	if (err)
4239 		goto done;
4240 
4241 	committer_time = got_object_commit_get_committer_time(commit);
4242 	datestr = get_datestr(&committer_time, datebuf);
4243 	if (datestr) {
4244 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4245 		if (n < 0) {
4246 			err = got_error_from_errno("fprintf");
4247 			goto done;
4248 		}
4249 		outoff += n;
4250 		err = add_line_metadata(lines, nlines, outoff,
4251 		    GOT_DIFF_LINE_DATE);
4252 		if (err)
4253 			goto done;
4254 	}
4255 	author = got_object_commit_get_author(commit);
4256 	committer = got_object_commit_get_committer(commit);
4257 	if (strcmp(author, committer) != 0) {
4258 		n = fprintf(outfile, "via: %s\n", committer);
4259 		if (n < 0) {
4260 			err = got_error_from_errno("fprintf");
4261 			goto done;
4262 		}
4263 		outoff += n;
4264 		err = add_line_metadata(lines, nlines, outoff,
4265 		    GOT_DIFF_LINE_AUTHOR);
4266 		if (err)
4267 			goto done;
4268 	}
4269 	if (got_object_commit_get_nparents(commit) > 1) {
4270 		const struct got_object_id_queue *parent_ids;
4271 		struct got_object_qid *qid;
4272 		int pn = 1;
4273 		parent_ids = got_object_commit_get_parent_ids(commit);
4274 		STAILQ_FOREACH(qid, parent_ids, entry) {
4275 			err = got_object_id_str(&id_str, &qid->id);
4276 			if (err)
4277 				goto done;
4278 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4279 			if (n < 0) {
4280 				err = got_error_from_errno("fprintf");
4281 				goto done;
4282 			}
4283 			outoff += n;
4284 			err = add_line_metadata(lines, nlines, outoff,
4285 			    GOT_DIFF_LINE_META);
4286 			if (err)
4287 				goto done;
4288 			free(id_str);
4289 			id_str = NULL;
4290 		}
4291 	}
4292 
4293 	err = got_object_commit_get_logmsg(&logmsg, commit);
4294 	if (err)
4295 		goto done;
4296 	s = logmsg;
4297 	while ((line = strsep(&s, "\n")) != NULL) {
4298 		n = fprintf(outfile, "%s\n", line);
4299 		if (n < 0) {
4300 			err = got_error_from_errno("fprintf");
4301 			goto done;
4302 		}
4303 		outoff += n;
4304 		err = add_line_metadata(lines, nlines, outoff,
4305 		    GOT_DIFF_LINE_LOGMSG);
4306 		if (err)
4307 			goto done;
4308 	}
4309 
4310 	err = get_changed_paths(&changed_paths, commit, repo);
4311 	if (err)
4312 		goto done;
4313 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4314 		struct got_diff_changed_path *cp = pe->data;
4315 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4316 		if (n < 0) {
4317 			err = got_error_from_errno("fprintf");
4318 			goto done;
4319 		}
4320 		outoff += n;
4321 		err = add_line_metadata(lines, nlines, outoff,
4322 		    GOT_DIFF_LINE_CHANGES);
4323 		if (err)
4324 			goto done;
4325 		free((char *)pe->path);
4326 		free(pe->data);
4327 	}
4328 
4329 	fputc('\n', outfile);
4330 	outoff++;
4331 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4332 done:
4333 	got_pathlist_free(&changed_paths);
4334 	free(id_str);
4335 	free(logmsg);
4336 	free(refs_str);
4337 	got_object_commit_close(commit);
4338 	if (err) {
4339 		free(*lines);
4340 		*lines = NULL;
4341 		*nlines = 0;
4342 	}
4343 	return err;
4344 }
4345 
4346 static const struct got_error *
4347 create_diff(struct tog_diff_view_state *s)
4348 {
4349 	const struct got_error *err = NULL;
4350 	FILE *f = NULL;
4351 	int obj_type;
4352 
4353 	free(s->lines);
4354 	s->lines = malloc(sizeof(*s->lines));
4355 	if (s->lines == NULL)
4356 		return got_error_from_errno("malloc");
4357 	s->nlines = 0;
4358 
4359 	f = got_opentemp();
4360 	if (f == NULL) {
4361 		err = got_error_from_errno("got_opentemp");
4362 		goto done;
4363 	}
4364 	if (s->f && fclose(s->f) == EOF) {
4365 		err = got_error_from_errno("fclose");
4366 		goto done;
4367 	}
4368 	s->f = f;
4369 
4370 	if (s->id1)
4371 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4372 	else
4373 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4374 	if (err)
4375 		goto done;
4376 
4377 	switch (obj_type) {
4378 	case GOT_OBJ_TYPE_BLOB:
4379 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4380 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4381 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4382 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4383 		break;
4384 	case GOT_OBJ_TYPE_TREE:
4385 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4386 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4387 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4388 		    s->force_text_diff, s->repo, s->f);
4389 		break;
4390 	case GOT_OBJ_TYPE_COMMIT: {
4391 		const struct got_object_id_queue *parent_ids;
4392 		struct got_object_qid *pid;
4393 		struct got_commit_object *commit2;
4394 		struct got_reflist_head *refs;
4395 
4396 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4397 		if (err)
4398 			goto done;
4399 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4400 		/* Show commit info if we're diffing to a parent/root commit. */
4401 		if (s->id1 == NULL) {
4402 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4403 			    refs, s->repo, s->f);
4404 			if (err)
4405 				goto done;
4406 		} else {
4407 			parent_ids = got_object_commit_get_parent_ids(commit2);
4408 			STAILQ_FOREACH(pid, parent_ids, entry) {
4409 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4410 					err = write_commit_info(&s->lines,
4411 					    &s->nlines, s->id2, refs, s->repo,
4412 					    s->f);
4413 					if (err)
4414 						goto done;
4415 					break;
4416 				}
4417 			}
4418 		}
4419 		got_object_commit_close(commit2);
4420 
4421 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4422 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4423 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4424 		    s->force_text_diff, s->repo, s->f);
4425 		break;
4426 	}
4427 	default:
4428 		err = got_error(GOT_ERR_OBJ_TYPE);
4429 		break;
4430 	}
4431 done:
4432 	if (s->f && fflush(s->f) != 0 && err == NULL)
4433 		err = got_error_from_errno("fflush");
4434 	return err;
4435 }
4436 
4437 static void
4438 diff_view_indicate_progress(struct tog_view *view)
4439 {
4440 	mvwaddstr(view->window, 0, 0, "diffing...");
4441 	update_panels();
4442 	doupdate();
4443 }
4444 
4445 static const struct got_error *
4446 search_start_diff_view(struct tog_view *view)
4447 {
4448 	struct tog_diff_view_state *s = &view->state.diff;
4449 
4450 	s->matched_line = 0;
4451 	return NULL;
4452 }
4453 
4454 static const struct got_error *
4455 search_next_diff_view(struct tog_view *view)
4456 {
4457 	struct tog_diff_view_state *s = &view->state.diff;
4458 	const struct got_error *err = NULL;
4459 	int lineno;
4460 	char *line = NULL;
4461 	size_t linesize = 0;
4462 	ssize_t linelen;
4463 
4464 	if (!view->searching) {
4465 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4466 		return NULL;
4467 	}
4468 
4469 	if (s->matched_line) {
4470 		if (view->searching == TOG_SEARCH_FORWARD)
4471 			lineno = s->matched_line + 1;
4472 		else
4473 			lineno = s->matched_line - 1;
4474 	} else
4475 		lineno = s->first_displayed_line;
4476 
4477 	while (1) {
4478 		off_t offset;
4479 
4480 		if (lineno <= 0 || lineno > s->nlines) {
4481 			if (s->matched_line == 0) {
4482 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4483 				break;
4484 			}
4485 
4486 			if (view->searching == TOG_SEARCH_FORWARD)
4487 				lineno = 1;
4488 			else
4489 				lineno = s->nlines;
4490 		}
4491 
4492 		offset = s->lines[lineno - 1].offset;
4493 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4494 			free(line);
4495 			return got_error_from_errno("fseeko");
4496 		}
4497 		linelen = getline(&line, &linesize, s->f);
4498 		if (linelen != -1) {
4499 			char *exstr;
4500 			err = expand_tab(&exstr, line);
4501 			if (err)
4502 				break;
4503 			if (match_line(exstr, &view->regex, 1,
4504 			    &view->regmatch)) {
4505 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4506 				s->matched_line = lineno;
4507 				free(exstr);
4508 				break;
4509 			}
4510 			free(exstr);
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 err;
4525 }
4526 
4527 static const struct got_error *
4528 close_diff_view(struct tog_view *view)
4529 {
4530 	const struct got_error *err = NULL;
4531 	struct tog_diff_view_state *s = &view->state.diff;
4532 
4533 	free(s->id1);
4534 	s->id1 = NULL;
4535 	free(s->id2);
4536 	s->id2 = NULL;
4537 	if (s->f && fclose(s->f) == EOF)
4538 		err = got_error_from_errno("fclose");
4539 	s->f = NULL;
4540 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4541 		err = got_error_from_errno("fclose");
4542 	s->f1 = NULL;
4543 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4544 		err = got_error_from_errno("fclose");
4545 	s->f2 = NULL;
4546 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4547 		err = got_error_from_errno("close");
4548 	s->fd1 = -1;
4549 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4550 		err = got_error_from_errno("close");
4551 	s->fd2 = -1;
4552 	free(s->lines);
4553 	s->lines = NULL;
4554 	s->nlines = 0;
4555 	return err;
4556 }
4557 
4558 static const struct got_error *
4559 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4560     struct got_object_id *id2, const char *label1, const char *label2,
4561     int diff_context, int ignore_whitespace, int force_text_diff,
4562     struct tog_view *parent_view, struct got_repository *repo)
4563 {
4564 	const struct got_error *err;
4565 	struct tog_diff_view_state *s = &view->state.diff;
4566 
4567 	memset(s, 0, sizeof(*s));
4568 	s->fd1 = -1;
4569 	s->fd2 = -1;
4570 
4571 	if (id1 != NULL && id2 != NULL) {
4572 	    int type1, type2;
4573 	    err = got_object_get_type(&type1, repo, id1);
4574 	    if (err)
4575 		return err;
4576 	    err = got_object_get_type(&type2, repo, id2);
4577 	    if (err)
4578 		return err;
4579 
4580 	    if (type1 != type2)
4581 		return got_error(GOT_ERR_OBJ_TYPE);
4582 	}
4583 	s->first_displayed_line = 1;
4584 	s->last_displayed_line = view->nlines;
4585 	s->selected_line = 1;
4586 	s->repo = repo;
4587 	s->id1 = id1;
4588 	s->id2 = id2;
4589 	s->label1 = label1;
4590 	s->label2 = label2;
4591 
4592 	if (id1) {
4593 		s->id1 = got_object_id_dup(id1);
4594 		if (s->id1 == NULL)
4595 			return got_error_from_errno("got_object_id_dup");
4596 	} else
4597 		s->id1 = NULL;
4598 
4599 	s->id2 = got_object_id_dup(id2);
4600 	if (s->id2 == NULL) {
4601 		err = got_error_from_errno("got_object_id_dup");
4602 		goto done;
4603 	}
4604 
4605 	s->f1 = got_opentemp();
4606 	if (s->f1 == NULL) {
4607 		err = got_error_from_errno("got_opentemp");
4608 		goto done;
4609 	}
4610 
4611 	s->f2 = got_opentemp();
4612 	if (s->f2 == NULL) {
4613 		err = got_error_from_errno("got_opentemp");
4614 		goto done;
4615 	}
4616 
4617 	s->fd1 = got_opentempfd();
4618 	if (s->fd1 == -1) {
4619 		err = got_error_from_errno("got_opentempfd");
4620 		goto done;
4621 	}
4622 
4623 	s->fd2 = got_opentempfd();
4624 	if (s->fd2 == -1) {
4625 		err = got_error_from_errno("got_opentempfd");
4626 		goto done;
4627 	}
4628 
4629 	s->first_displayed_line = 1;
4630 	s->last_displayed_line = view->nlines;
4631 	s->diff_context = diff_context;
4632 	s->ignore_whitespace = ignore_whitespace;
4633 	s->force_text_diff = force_text_diff;
4634 	s->parent_view = parent_view;
4635 	s->repo = repo;
4636 
4637 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4638 		int rc;
4639 
4640 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4641 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4642 		if (rc != ERR)
4643 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4644 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4645 		if (rc != ERR)
4646 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4647 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4648 		if (rc != ERR)
4649 			rc = init_pair(GOT_DIFF_LINE_META,
4650 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4651 		if (rc != ERR)
4652 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4653 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4654 		if (rc != ERR)
4655 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4656 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4657 		if (rc != ERR)
4658 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4659 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4660 		if (rc != ERR)
4661 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4662 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4663 		if (rc != ERR)
4664 			rc = init_pair(GOT_DIFF_LINE_DATE,
4665 			    get_color_value("TOG_COLOR_DATE"), -1);
4666 		if (rc == ERR) {
4667 			err = got_error(GOT_ERR_RANGE);
4668 			goto done;
4669 		}
4670 	}
4671 
4672 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4673 	    view_is_splitscreen(view))
4674 		show_log_view(parent_view); /* draw border */
4675 	diff_view_indicate_progress(view);
4676 
4677 	err = create_diff(s);
4678 
4679 	view->show = show_diff_view;
4680 	view->input = input_diff_view;
4681 	view->reset = reset_diff_view;
4682 	view->close = close_diff_view;
4683 	view->search_start = search_start_diff_view;
4684 	view->search_next = search_next_diff_view;
4685 done:
4686 	if (err)
4687 		close_diff_view(view);
4688 	return err;
4689 }
4690 
4691 static const struct got_error *
4692 show_diff_view(struct tog_view *view)
4693 {
4694 	const struct got_error *err;
4695 	struct tog_diff_view_state *s = &view->state.diff;
4696 	char *id_str1 = NULL, *id_str2, *header;
4697 	const char *label1, *label2;
4698 
4699 	if (s->id1) {
4700 		err = got_object_id_str(&id_str1, s->id1);
4701 		if (err)
4702 			return err;
4703 		label1 = s->label1 ? : id_str1;
4704 	} else
4705 		label1 = "/dev/null";
4706 
4707 	err = got_object_id_str(&id_str2, s->id2);
4708 	if (err)
4709 		return err;
4710 	label2 = s->label2 ? : id_str2;
4711 
4712 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4713 		err = got_error_from_errno("asprintf");
4714 		free(id_str1);
4715 		free(id_str2);
4716 		return err;
4717 	}
4718 	free(id_str1);
4719 	free(id_str2);
4720 
4721 	err = draw_file(view, header);
4722 	free(header);
4723 	return err;
4724 }
4725 
4726 static const struct got_error *
4727 set_selected_commit(struct tog_diff_view_state *s,
4728     struct commit_queue_entry *entry)
4729 {
4730 	const struct got_error *err;
4731 	const struct got_object_id_queue *parent_ids;
4732 	struct got_commit_object *selected_commit;
4733 	struct got_object_qid *pid;
4734 
4735 	free(s->id2);
4736 	s->id2 = got_object_id_dup(entry->id);
4737 	if (s->id2 == NULL)
4738 		return got_error_from_errno("got_object_id_dup");
4739 
4740 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4741 	if (err)
4742 		return err;
4743 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4744 	free(s->id1);
4745 	pid = STAILQ_FIRST(parent_ids);
4746 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4747 	got_object_commit_close(selected_commit);
4748 	return NULL;
4749 }
4750 
4751 static const struct got_error *
4752 reset_diff_view(struct tog_view *view)
4753 {
4754 	struct tog_diff_view_state *s = &view->state.diff;
4755 
4756 	view->count = 0;
4757 	wclear(view->window);
4758 	s->first_displayed_line = 1;
4759 	s->last_displayed_line = view->nlines;
4760 	s->matched_line = 0;
4761 	diff_view_indicate_progress(view);
4762 	return create_diff(s);
4763 }
4764 
4765 static void
4766 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4767 {
4768 	int start, i;
4769 
4770 	i = start = s->first_displayed_line - 1;
4771 
4772 	while (s->lines[i].type != type) {
4773 		if (i == 0)
4774 			i = s->nlines - 1;
4775 		if (--i == start)
4776 			return; /* do nothing, requested type not in file */
4777 	}
4778 
4779 	s->selected_line = 1;
4780 	s->first_displayed_line = i;
4781 }
4782 
4783 static void
4784 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4785 {
4786 	int start, i;
4787 
4788 	i = start = s->first_displayed_line + 1;
4789 
4790 	while (s->lines[i].type != type) {
4791 		if (i == s->nlines - 1)
4792 			i = 0;
4793 		if (++i == start)
4794 			return; /* do nothing, requested type not in file */
4795 	}
4796 
4797 	s->selected_line = 1;
4798 	s->first_displayed_line = i;
4799 }
4800 
4801 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4802     int, int, int);
4803 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4804     int, int);
4805 
4806 static const struct got_error *
4807 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4808 {
4809 	const struct got_error *err = NULL;
4810 	struct tog_diff_view_state *s = &view->state.diff;
4811 	struct tog_log_view_state *ls;
4812 	struct commit_queue_entry *old_selected_entry;
4813 	char *line = NULL;
4814 	size_t linesize = 0;
4815 	ssize_t linelen;
4816 	int i, nscroll = view->nlines - 1, up = 0;
4817 
4818 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4819 
4820 	switch (ch) {
4821 	case '0':
4822 		view->x = 0;
4823 		break;
4824 	case '$':
4825 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4826 		view->count = 0;
4827 		break;
4828 	case KEY_RIGHT:
4829 	case 'l':
4830 		if (view->x + view->ncols / 3 < view->maxx)
4831 			view->x += 2;  /* move two columns right */
4832 		else
4833 			view->count = 0;
4834 		break;
4835 	case KEY_LEFT:
4836 	case 'h':
4837 		view->x -= MIN(view->x, 2);  /* move two columns back */
4838 		if (view->x <= 0)
4839 			view->count = 0;
4840 		break;
4841 	case 'a':
4842 	case 'w':
4843 		if (ch == 'a')
4844 			s->force_text_diff = !s->force_text_diff;
4845 		if (ch == 'w')
4846 			s->ignore_whitespace = !s->ignore_whitespace;
4847 		err = reset_diff_view(view);
4848 		break;
4849 	case 'g':
4850 	case KEY_HOME:
4851 		s->first_displayed_line = 1;
4852 		view->count = 0;
4853 		break;
4854 	case 'G':
4855 	case KEY_END:
4856 		view->count = 0;
4857 		if (s->eof)
4858 			break;
4859 
4860 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4861 		s->eof = 1;
4862 		break;
4863 	case 'k':
4864 	case KEY_UP:
4865 	case CTRL('p'):
4866 		if (s->first_displayed_line > 1)
4867 			s->first_displayed_line--;
4868 		else
4869 			view->count = 0;
4870 		break;
4871 	case CTRL('u'):
4872 	case 'u':
4873 		nscroll /= 2;
4874 		/* FALL THROUGH */
4875 	case KEY_PPAGE:
4876 	case CTRL('b'):
4877 	case 'b':
4878 		if (s->first_displayed_line == 1) {
4879 			view->count = 0;
4880 			break;
4881 		}
4882 		i = 0;
4883 		while (i++ < nscroll && s->first_displayed_line > 1)
4884 			s->first_displayed_line--;
4885 		break;
4886 	case 'j':
4887 	case KEY_DOWN:
4888 	case CTRL('n'):
4889 		if (!s->eof)
4890 			s->first_displayed_line++;
4891 		else
4892 			view->count = 0;
4893 		break;
4894 	case CTRL('d'):
4895 	case 'd':
4896 		nscroll /= 2;
4897 		/* FALL THROUGH */
4898 	case KEY_NPAGE:
4899 	case CTRL('f'):
4900 	case 'f':
4901 	case ' ':
4902 		if (s->eof) {
4903 			view->count = 0;
4904 			break;
4905 		}
4906 		i = 0;
4907 		while (!s->eof && i++ < nscroll) {
4908 			linelen = getline(&line, &linesize, s->f);
4909 			s->first_displayed_line++;
4910 			if (linelen == -1) {
4911 				if (feof(s->f)) {
4912 					s->eof = 1;
4913 				} else
4914 					err = got_ferror(s->f, GOT_ERR_IO);
4915 				break;
4916 			}
4917 		}
4918 		free(line);
4919 		break;
4920 	case '(':
4921 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4922 		break;
4923 	case ')':
4924 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4925 		break;
4926 	case '{':
4927 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4928 		break;
4929 	case '}':
4930 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4931 		break;
4932 	case '[':
4933 		if (s->diff_context > 0) {
4934 			s->diff_context--;
4935 			s->matched_line = 0;
4936 			diff_view_indicate_progress(view);
4937 			err = create_diff(s);
4938 			if (s->first_displayed_line + view->nlines - 1 >
4939 			    s->nlines) {
4940 				s->first_displayed_line = 1;
4941 				s->last_displayed_line = view->nlines;
4942 			}
4943 		} else
4944 			view->count = 0;
4945 		break;
4946 	case ']':
4947 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4948 			s->diff_context++;
4949 			s->matched_line = 0;
4950 			diff_view_indicate_progress(view);
4951 			err = create_diff(s);
4952 		} else
4953 			view->count = 0;
4954 		break;
4955 	case '<':
4956 	case ',':
4957 	case 'K':
4958 		up = 1;
4959 		/* FALL THROUGH */
4960 	case '>':
4961 	case '.':
4962 	case 'J':
4963 		if (s->parent_view == NULL) {
4964 			view->count = 0;
4965 			break;
4966 		}
4967 		s->parent_view->count = view->count;
4968 
4969 		if (s->parent_view->type == TOG_VIEW_LOG) {
4970 			ls = &s->parent_view->state.log;
4971 			old_selected_entry = ls->selected_entry;
4972 
4973 			err = input_log_view(NULL, s->parent_view,
4974 			    up ? KEY_UP : KEY_DOWN);
4975 			if (err)
4976 				break;
4977 			view->count = s->parent_view->count;
4978 
4979 			if (old_selected_entry == ls->selected_entry)
4980 				break;
4981 
4982 			err = set_selected_commit(s, ls->selected_entry);
4983 			if (err)
4984 				break;
4985 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4986 			struct tog_blame_view_state *bs;
4987 			struct got_object_id *id, *prev_id;
4988 
4989 			bs = &s->parent_view->state.blame;
4990 			prev_id = get_annotation_for_line(bs->blame.lines,
4991 			    bs->blame.nlines, bs->last_diffed_line);
4992 
4993 			err = input_blame_view(&view, s->parent_view,
4994 			    up ? KEY_UP : KEY_DOWN);
4995 			if (err)
4996 				break;
4997 			view->count = s->parent_view->count;
4998 
4999 			if (prev_id == NULL)
5000 				break;
5001 			id = get_selected_commit_id(bs->blame.lines,
5002 			    bs->blame.nlines, bs->first_displayed_line,
5003 			    bs->selected_line);
5004 			if (id == NULL)
5005 				break;
5006 
5007 			if (!got_object_id_cmp(prev_id, id))
5008 				break;
5009 
5010 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5011 			if (err)
5012 				break;
5013 		}
5014 		s->first_displayed_line = 1;
5015 		s->last_displayed_line = view->nlines;
5016 		s->matched_line = 0;
5017 		view->x = 0;
5018 
5019 		diff_view_indicate_progress(view);
5020 		err = create_diff(s);
5021 		break;
5022 	default:
5023 		view->count = 0;
5024 		break;
5025 	}
5026 
5027 	return err;
5028 }
5029 
5030 static const struct got_error *
5031 cmd_diff(int argc, char *argv[])
5032 {
5033 	const struct got_error *error = NULL;
5034 	struct got_repository *repo = NULL;
5035 	struct got_worktree *worktree = NULL;
5036 	struct got_object_id *id1 = NULL, *id2 = NULL;
5037 	char *repo_path = NULL, *cwd = NULL;
5038 	char *id_str1 = NULL, *id_str2 = NULL;
5039 	char *label1 = NULL, *label2 = NULL;
5040 	int diff_context = 3, ignore_whitespace = 0;
5041 	int ch, force_text_diff = 0;
5042 	const char *errstr;
5043 	struct tog_view *view;
5044 	int *pack_fds = NULL;
5045 
5046 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5047 		switch (ch) {
5048 		case 'a':
5049 			force_text_diff = 1;
5050 			break;
5051 		case 'C':
5052 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5053 			    &errstr);
5054 			if (errstr != NULL)
5055 				errx(1, "number of context lines is %s: %s",
5056 				    errstr, errstr);
5057 			break;
5058 		case 'r':
5059 			repo_path = realpath(optarg, NULL);
5060 			if (repo_path == NULL)
5061 				return got_error_from_errno2("realpath",
5062 				    optarg);
5063 			got_path_strip_trailing_slashes(repo_path);
5064 			break;
5065 		case 'w':
5066 			ignore_whitespace = 1;
5067 			break;
5068 		default:
5069 			usage_diff();
5070 			/* NOTREACHED */
5071 		}
5072 	}
5073 
5074 	argc -= optind;
5075 	argv += optind;
5076 
5077 	if (argc == 0) {
5078 		usage_diff(); /* TODO show local worktree changes */
5079 	} else if (argc == 2) {
5080 		id_str1 = argv[0];
5081 		id_str2 = argv[1];
5082 	} else
5083 		usage_diff();
5084 
5085 	error = got_repo_pack_fds_open(&pack_fds);
5086 	if (error)
5087 		goto done;
5088 
5089 	if (repo_path == NULL) {
5090 		cwd = getcwd(NULL, 0);
5091 		if (cwd == NULL)
5092 			return got_error_from_errno("getcwd");
5093 		error = got_worktree_open(&worktree, cwd);
5094 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5095 			goto done;
5096 		if (worktree)
5097 			repo_path =
5098 			    strdup(got_worktree_get_repo_path(worktree));
5099 		else
5100 			repo_path = strdup(cwd);
5101 		if (repo_path == NULL) {
5102 			error = got_error_from_errno("strdup");
5103 			goto done;
5104 		}
5105 	}
5106 
5107 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5108 	if (error)
5109 		goto done;
5110 
5111 	init_curses();
5112 
5113 	error = apply_unveil(got_repo_get_path(repo), NULL);
5114 	if (error)
5115 		goto done;
5116 
5117 	error = tog_load_refs(repo, 0);
5118 	if (error)
5119 		goto done;
5120 
5121 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5122 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5123 	if (error)
5124 		goto done;
5125 
5126 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5127 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5128 	if (error)
5129 		goto done;
5130 
5131 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5132 	if (view == NULL) {
5133 		error = got_error_from_errno("view_open");
5134 		goto done;
5135 	}
5136 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5137 	    ignore_whitespace, force_text_diff, NULL,  repo);
5138 	if (error)
5139 		goto done;
5140 	error = view_loop(view);
5141 done:
5142 	free(label1);
5143 	free(label2);
5144 	free(repo_path);
5145 	free(cwd);
5146 	if (repo) {
5147 		const struct got_error *close_err = got_repo_close(repo);
5148 		if (error == NULL)
5149 			error = close_err;
5150 	}
5151 	if (worktree)
5152 		got_worktree_close(worktree);
5153 	if (pack_fds) {
5154 		const struct got_error *pack_err =
5155 		    got_repo_pack_fds_close(pack_fds);
5156 		if (error == NULL)
5157 			error = pack_err;
5158 	}
5159 	tog_free_refs();
5160 	return error;
5161 }
5162 
5163 __dead static void
5164 usage_blame(void)
5165 {
5166 	endwin();
5167 	fprintf(stderr,
5168 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5169 	    getprogname());
5170 	exit(1);
5171 }
5172 
5173 struct tog_blame_line {
5174 	int annotated;
5175 	struct got_object_id *id;
5176 };
5177 
5178 static const struct got_error *
5179 draw_blame(struct tog_view *view)
5180 {
5181 	struct tog_blame_view_state *s = &view->state.blame;
5182 	struct tog_blame *blame = &s->blame;
5183 	regmatch_t *regmatch = &view->regmatch;
5184 	const struct got_error *err;
5185 	int lineno = 0, nprinted = 0;
5186 	char *line = NULL;
5187 	size_t linesize = 0;
5188 	ssize_t linelen;
5189 	wchar_t *wline;
5190 	int width;
5191 	struct tog_blame_line *blame_line;
5192 	struct got_object_id *prev_id = NULL;
5193 	char *id_str;
5194 	struct tog_color *tc;
5195 
5196 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5197 	if (err)
5198 		return err;
5199 
5200 	rewind(blame->f);
5201 	werase(view->window);
5202 
5203 	if (asprintf(&line, "commit %s", id_str) == -1) {
5204 		err = got_error_from_errno("asprintf");
5205 		free(id_str);
5206 		return err;
5207 	}
5208 
5209 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5210 	free(line);
5211 	line = NULL;
5212 	if (err)
5213 		return err;
5214 	if (view_needs_focus_indication(view))
5215 		wstandout(view->window);
5216 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5217 	if (tc)
5218 		wattr_on(view->window,
5219 		    COLOR_PAIR(tc->colorpair), NULL);
5220 	waddwstr(view->window, wline);
5221 	if (tc)
5222 		wattr_off(view->window,
5223 		    COLOR_PAIR(tc->colorpair), NULL);
5224 	if (view_needs_focus_indication(view))
5225 		wstandend(view->window);
5226 	free(wline);
5227 	wline = NULL;
5228 	if (width < view->ncols - 1)
5229 		waddch(view->window, '\n');
5230 
5231 	if (view->gline > blame->nlines)
5232 		view->gline = blame->nlines;
5233 
5234 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5235 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5236 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5237 		free(id_str);
5238 		return got_error_from_errno("asprintf");
5239 	}
5240 	free(id_str);
5241 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5242 	free(line);
5243 	line = NULL;
5244 	if (err)
5245 		return err;
5246 	waddwstr(view->window, wline);
5247 	free(wline);
5248 	wline = NULL;
5249 	if (width < view->ncols - 1)
5250 		waddch(view->window, '\n');
5251 
5252 	s->eof = 0;
5253 	view->maxx = 0;
5254 	while (nprinted < view->nlines - 2) {
5255 		linelen = getline(&line, &linesize, blame->f);
5256 		if (linelen == -1) {
5257 			if (feof(blame->f)) {
5258 				s->eof = 1;
5259 				break;
5260 			}
5261 			free(line);
5262 			return got_ferror(blame->f, GOT_ERR_IO);
5263 		}
5264 		if (++lineno < s->first_displayed_line)
5265 			continue;
5266 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5267 			continue;
5268 
5269 		/* Set view->maxx based on full line length. */
5270 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5271 		if (err) {
5272 			free(line);
5273 			return err;
5274 		}
5275 		free(wline);
5276 		wline = NULL;
5277 		view->maxx = MAX(view->maxx, width);
5278 
5279 		if (nprinted == s->selected_line - 1)
5280 			wstandout(view->window);
5281 
5282 		if (blame->nlines > 0) {
5283 			blame_line = &blame->lines[lineno - 1];
5284 			if (blame_line->annotated && prev_id &&
5285 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5286 			    !(nprinted == s->selected_line - 1)) {
5287 				waddstr(view->window, "        ");
5288 			} else if (blame_line->annotated) {
5289 				char *id_str;
5290 				err = got_object_id_str(&id_str,
5291 				    blame_line->id);
5292 				if (err) {
5293 					free(line);
5294 					return err;
5295 				}
5296 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5297 				if (tc)
5298 					wattr_on(view->window,
5299 					    COLOR_PAIR(tc->colorpair), NULL);
5300 				wprintw(view->window, "%.8s", id_str);
5301 				if (tc)
5302 					wattr_off(view->window,
5303 					    COLOR_PAIR(tc->colorpair), NULL);
5304 				free(id_str);
5305 				prev_id = blame_line->id;
5306 			} else {
5307 				waddstr(view->window, "........");
5308 				prev_id = NULL;
5309 			}
5310 		} else {
5311 			waddstr(view->window, "........");
5312 			prev_id = NULL;
5313 		}
5314 
5315 		if (nprinted == s->selected_line - 1)
5316 			wstandend(view->window);
5317 		waddstr(view->window, " ");
5318 
5319 		if (view->ncols <= 9) {
5320 			width = 9;
5321 		} else if (s->first_displayed_line + nprinted ==
5322 		    s->matched_line &&
5323 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5324 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5325 			    view->window, view->x, regmatch);
5326 			if (err) {
5327 				free(line);
5328 				return err;
5329 			}
5330 			width += 9;
5331 		} else {
5332 			int skip;
5333 			err = format_line(&wline, &width, &skip, line,
5334 			    view->x, view->ncols - 9, 9, 1);
5335 			if (err) {
5336 				free(line);
5337 				return err;
5338 			}
5339 			waddwstr(view->window, &wline[skip]);
5340 			width += 9;
5341 			free(wline);
5342 			wline = NULL;
5343 		}
5344 
5345 		if (width <= view->ncols - 1)
5346 			waddch(view->window, '\n');
5347 		if (++nprinted == 1)
5348 			s->first_displayed_line = lineno;
5349 	}
5350 	free(line);
5351 	s->last_displayed_line = lineno;
5352 
5353 	view_border(view);
5354 
5355 	return NULL;
5356 }
5357 
5358 static const struct got_error *
5359 blame_cb(void *arg, int nlines, int lineno,
5360     struct got_commit_object *commit, struct got_object_id *id)
5361 {
5362 	const struct got_error *err = NULL;
5363 	struct tog_blame_cb_args *a = arg;
5364 	struct tog_blame_line *line;
5365 	int errcode;
5366 
5367 	if (nlines != a->nlines ||
5368 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5369 		return got_error(GOT_ERR_RANGE);
5370 
5371 	errcode = pthread_mutex_lock(&tog_mutex);
5372 	if (errcode)
5373 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5374 
5375 	if (*a->quit) {	/* user has quit the blame view */
5376 		err = got_error(GOT_ERR_ITER_COMPLETED);
5377 		goto done;
5378 	}
5379 
5380 	if (lineno == -1)
5381 		goto done; /* no change in this commit */
5382 
5383 	line = &a->lines[lineno - 1];
5384 	if (line->annotated)
5385 		goto done;
5386 
5387 	line->id = got_object_id_dup(id);
5388 	if (line->id == NULL) {
5389 		err = got_error_from_errno("got_object_id_dup");
5390 		goto done;
5391 	}
5392 	line->annotated = 1;
5393 done:
5394 	errcode = pthread_mutex_unlock(&tog_mutex);
5395 	if (errcode)
5396 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5397 	return err;
5398 }
5399 
5400 static void *
5401 blame_thread(void *arg)
5402 {
5403 	const struct got_error *err, *close_err;
5404 	struct tog_blame_thread_args *ta = arg;
5405 	struct tog_blame_cb_args *a = ta->cb_args;
5406 	int errcode, fd1 = -1, fd2 = -1;
5407 	FILE *f1 = NULL, *f2 = NULL;
5408 
5409 	fd1 = got_opentempfd();
5410 	if (fd1 == -1)
5411 		return (void *)got_error_from_errno("got_opentempfd");
5412 
5413 	fd2 = got_opentempfd();
5414 	if (fd2 == -1) {
5415 		err = got_error_from_errno("got_opentempfd");
5416 		goto done;
5417 	}
5418 
5419 	f1 = got_opentemp();
5420 	if (f1 == NULL) {
5421 		err = (void *)got_error_from_errno("got_opentemp");
5422 		goto done;
5423 	}
5424 	f2 = got_opentemp();
5425 	if (f2 == NULL) {
5426 		err = (void *)got_error_from_errno("got_opentemp");
5427 		goto done;
5428 	}
5429 
5430 	err = block_signals_used_by_main_thread();
5431 	if (err)
5432 		goto done;
5433 
5434 	err = got_blame(ta->path, a->commit_id, ta->repo,
5435 	    tog_diff_algo, blame_cb, ta->cb_args,
5436 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5437 	if (err && err->code == GOT_ERR_CANCELLED)
5438 		err = NULL;
5439 
5440 	errcode = pthread_mutex_lock(&tog_mutex);
5441 	if (errcode) {
5442 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5443 		goto done;
5444 	}
5445 
5446 	close_err = got_repo_close(ta->repo);
5447 	if (err == NULL)
5448 		err = close_err;
5449 	ta->repo = NULL;
5450 	*ta->complete = 1;
5451 
5452 	errcode = pthread_mutex_unlock(&tog_mutex);
5453 	if (errcode && err == NULL)
5454 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5455 
5456 done:
5457 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5458 		err = got_error_from_errno("close");
5459 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5460 		err = got_error_from_errno("close");
5461 	if (f1 && fclose(f1) == EOF && err == NULL)
5462 		err = got_error_from_errno("fclose");
5463 	if (f2 && fclose(f2) == EOF && err == NULL)
5464 		err = got_error_from_errno("fclose");
5465 
5466 	return (void *)err;
5467 }
5468 
5469 static struct got_object_id *
5470 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5471     int first_displayed_line, int selected_line)
5472 {
5473 	struct tog_blame_line *line;
5474 
5475 	if (nlines <= 0)
5476 		return NULL;
5477 
5478 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5479 	if (!line->annotated)
5480 		return NULL;
5481 
5482 	return line->id;
5483 }
5484 
5485 static struct got_object_id *
5486 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5487     int lineno)
5488 {
5489 	struct tog_blame_line *line;
5490 
5491 	if (nlines <= 0 || lineno >= nlines)
5492 		return NULL;
5493 
5494 	line = &lines[lineno - 1];
5495 	if (!line->annotated)
5496 		return NULL;
5497 
5498 	return line->id;
5499 }
5500 
5501 static const struct got_error *
5502 stop_blame(struct tog_blame *blame)
5503 {
5504 	const struct got_error *err = NULL;
5505 	int i;
5506 
5507 	if (blame->thread) {
5508 		int errcode;
5509 		errcode = pthread_mutex_unlock(&tog_mutex);
5510 		if (errcode)
5511 			return got_error_set_errno(errcode,
5512 			    "pthread_mutex_unlock");
5513 		errcode = pthread_join(blame->thread, (void **)&err);
5514 		if (errcode)
5515 			return got_error_set_errno(errcode, "pthread_join");
5516 		errcode = pthread_mutex_lock(&tog_mutex);
5517 		if (errcode)
5518 			return got_error_set_errno(errcode,
5519 			    "pthread_mutex_lock");
5520 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5521 			err = NULL;
5522 		blame->thread = 0; //NULL;
5523 	}
5524 	if (blame->thread_args.repo) {
5525 		const struct got_error *close_err;
5526 		close_err = got_repo_close(blame->thread_args.repo);
5527 		if (err == NULL)
5528 			err = close_err;
5529 		blame->thread_args.repo = NULL;
5530 	}
5531 	if (blame->f) {
5532 		if (fclose(blame->f) == EOF && err == NULL)
5533 			err = got_error_from_errno("fclose");
5534 		blame->f = NULL;
5535 	}
5536 	if (blame->lines) {
5537 		for (i = 0; i < blame->nlines; i++)
5538 			free(blame->lines[i].id);
5539 		free(blame->lines);
5540 		blame->lines = NULL;
5541 	}
5542 	free(blame->cb_args.commit_id);
5543 	blame->cb_args.commit_id = NULL;
5544 	if (blame->pack_fds) {
5545 		const struct got_error *pack_err =
5546 		    got_repo_pack_fds_close(blame->pack_fds);
5547 		if (err == NULL)
5548 			err = pack_err;
5549 		blame->pack_fds = NULL;
5550 	}
5551 	return err;
5552 }
5553 
5554 static const struct got_error *
5555 cancel_blame_view(void *arg)
5556 {
5557 	const struct got_error *err = NULL;
5558 	int *done = arg;
5559 	int errcode;
5560 
5561 	errcode = pthread_mutex_lock(&tog_mutex);
5562 	if (errcode)
5563 		return got_error_set_errno(errcode,
5564 		    "pthread_mutex_unlock");
5565 
5566 	if (*done)
5567 		err = got_error(GOT_ERR_CANCELLED);
5568 
5569 	errcode = pthread_mutex_unlock(&tog_mutex);
5570 	if (errcode)
5571 		return got_error_set_errno(errcode,
5572 		    "pthread_mutex_lock");
5573 
5574 	return err;
5575 }
5576 
5577 static const struct got_error *
5578 run_blame(struct tog_view *view)
5579 {
5580 	struct tog_blame_view_state *s = &view->state.blame;
5581 	struct tog_blame *blame = &s->blame;
5582 	const struct got_error *err = NULL;
5583 	struct got_commit_object *commit = NULL;
5584 	struct got_blob_object *blob = NULL;
5585 	struct got_repository *thread_repo = NULL;
5586 	struct got_object_id *obj_id = NULL;
5587 	int obj_type, fd = -1;
5588 	int *pack_fds = NULL;
5589 
5590 	err = got_object_open_as_commit(&commit, s->repo,
5591 	    &s->blamed_commit->id);
5592 	if (err)
5593 		return err;
5594 
5595 	fd = got_opentempfd();
5596 	if (fd == -1) {
5597 		err = got_error_from_errno("got_opentempfd");
5598 		goto done;
5599 	}
5600 
5601 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5602 	if (err)
5603 		goto done;
5604 
5605 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5606 	if (err)
5607 		goto done;
5608 
5609 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5610 		err = got_error(GOT_ERR_OBJ_TYPE);
5611 		goto done;
5612 	}
5613 
5614 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5615 	if (err)
5616 		goto done;
5617 	blame->f = got_opentemp();
5618 	if (blame->f == NULL) {
5619 		err = got_error_from_errno("got_opentemp");
5620 		goto done;
5621 	}
5622 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5623 	    &blame->line_offsets, blame->f, blob);
5624 	if (err)
5625 		goto done;
5626 	if (blame->nlines == 0) {
5627 		s->blame_complete = 1;
5628 		goto done;
5629 	}
5630 
5631 	/* Don't include \n at EOF in the blame line count. */
5632 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5633 		blame->nlines--;
5634 
5635 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5636 	if (blame->lines == NULL) {
5637 		err = got_error_from_errno("calloc");
5638 		goto done;
5639 	}
5640 
5641 	err = got_repo_pack_fds_open(&pack_fds);
5642 	if (err)
5643 		goto done;
5644 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5645 	    pack_fds);
5646 	if (err)
5647 		goto done;
5648 
5649 	blame->pack_fds = pack_fds;
5650 	blame->cb_args.view = view;
5651 	blame->cb_args.lines = blame->lines;
5652 	blame->cb_args.nlines = blame->nlines;
5653 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5654 	if (blame->cb_args.commit_id == NULL) {
5655 		err = got_error_from_errno("got_object_id_dup");
5656 		goto done;
5657 	}
5658 	blame->cb_args.quit = &s->done;
5659 
5660 	blame->thread_args.path = s->path;
5661 	blame->thread_args.repo = thread_repo;
5662 	blame->thread_args.cb_args = &blame->cb_args;
5663 	blame->thread_args.complete = &s->blame_complete;
5664 	blame->thread_args.cancel_cb = cancel_blame_view;
5665 	blame->thread_args.cancel_arg = &s->done;
5666 	s->blame_complete = 0;
5667 
5668 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5669 		s->first_displayed_line = 1;
5670 		s->last_displayed_line = view->nlines;
5671 		s->selected_line = 1;
5672 	}
5673 	s->matched_line = 0;
5674 
5675 done:
5676 	if (commit)
5677 		got_object_commit_close(commit);
5678 	if (fd != -1 && close(fd) == -1 && err == NULL)
5679 		err = got_error_from_errno("close");
5680 	if (blob)
5681 		got_object_blob_close(blob);
5682 	free(obj_id);
5683 	if (err)
5684 		stop_blame(blame);
5685 	return err;
5686 }
5687 
5688 static const struct got_error *
5689 open_blame_view(struct tog_view *view, char *path,
5690     struct got_object_id *commit_id, struct got_repository *repo)
5691 {
5692 	const struct got_error *err = NULL;
5693 	struct tog_blame_view_state *s = &view->state.blame;
5694 
5695 	STAILQ_INIT(&s->blamed_commits);
5696 
5697 	s->path = strdup(path);
5698 	if (s->path == NULL)
5699 		return got_error_from_errno("strdup");
5700 
5701 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5702 	if (err) {
5703 		free(s->path);
5704 		return err;
5705 	}
5706 
5707 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5708 	s->first_displayed_line = 1;
5709 	s->last_displayed_line = view->nlines;
5710 	s->selected_line = 1;
5711 	s->blame_complete = 0;
5712 	s->repo = repo;
5713 	s->commit_id = commit_id;
5714 	memset(&s->blame, 0, sizeof(s->blame));
5715 
5716 	STAILQ_INIT(&s->colors);
5717 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5718 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5719 		    get_color_value("TOG_COLOR_COMMIT"));
5720 		if (err)
5721 			return err;
5722 	}
5723 
5724 	view->show = show_blame_view;
5725 	view->input = input_blame_view;
5726 	view->reset = reset_blame_view;
5727 	view->close = close_blame_view;
5728 	view->search_start = search_start_blame_view;
5729 	view->search_next = search_next_blame_view;
5730 
5731 	return run_blame(view);
5732 }
5733 
5734 static const struct got_error *
5735 close_blame_view(struct tog_view *view)
5736 {
5737 	const struct got_error *err = NULL;
5738 	struct tog_blame_view_state *s = &view->state.blame;
5739 
5740 	if (s->blame.thread)
5741 		err = stop_blame(&s->blame);
5742 
5743 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5744 		struct got_object_qid *blamed_commit;
5745 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5746 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5747 		got_object_qid_free(blamed_commit);
5748 	}
5749 
5750 	free(s->path);
5751 	free_colors(&s->colors);
5752 	return err;
5753 }
5754 
5755 static const struct got_error *
5756 search_start_blame_view(struct tog_view *view)
5757 {
5758 	struct tog_blame_view_state *s = &view->state.blame;
5759 
5760 	s->matched_line = 0;
5761 	return NULL;
5762 }
5763 
5764 static const struct got_error *
5765 search_next_blame_view(struct tog_view *view)
5766 {
5767 	struct tog_blame_view_state *s = &view->state.blame;
5768 	const struct got_error *err = NULL;
5769 	int lineno;
5770 	char *line = NULL;
5771 	size_t linesize = 0;
5772 	ssize_t linelen;
5773 
5774 	if (!view->searching) {
5775 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5776 		return NULL;
5777 	}
5778 
5779 	if (s->matched_line) {
5780 		if (view->searching == TOG_SEARCH_FORWARD)
5781 			lineno = s->matched_line + 1;
5782 		else
5783 			lineno = s->matched_line - 1;
5784 	} else
5785 		lineno = s->first_displayed_line - 1 + s->selected_line;
5786 
5787 	while (1) {
5788 		off_t offset;
5789 
5790 		if (lineno <= 0 || lineno > s->blame.nlines) {
5791 			if (s->matched_line == 0) {
5792 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5793 				break;
5794 			}
5795 
5796 			if (view->searching == TOG_SEARCH_FORWARD)
5797 				lineno = 1;
5798 			else
5799 				lineno = s->blame.nlines;
5800 		}
5801 
5802 		offset = s->blame.line_offsets[lineno - 1];
5803 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5804 			free(line);
5805 			return got_error_from_errno("fseeko");
5806 		}
5807 		linelen = getline(&line, &linesize, s->blame.f);
5808 		if (linelen != -1) {
5809 			char *exstr;
5810 			err = expand_tab(&exstr, line);
5811 			if (err)
5812 				break;
5813 			if (match_line(exstr, &view->regex, 1,
5814 			    &view->regmatch)) {
5815 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5816 				s->matched_line = lineno;
5817 				free(exstr);
5818 				break;
5819 			}
5820 			free(exstr);
5821 		}
5822 		if (view->searching == TOG_SEARCH_FORWARD)
5823 			lineno++;
5824 		else
5825 			lineno--;
5826 	}
5827 	free(line);
5828 
5829 	if (s->matched_line) {
5830 		s->first_displayed_line = s->matched_line;
5831 		s->selected_line = 1;
5832 	}
5833 
5834 	return err;
5835 }
5836 
5837 static const struct got_error *
5838 show_blame_view(struct tog_view *view)
5839 {
5840 	const struct got_error *err = NULL;
5841 	struct tog_blame_view_state *s = &view->state.blame;
5842 	int errcode;
5843 
5844 	if (s->blame.thread == 0 && !s->blame_complete) {
5845 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5846 		    &s->blame.thread_args);
5847 		if (errcode)
5848 			return got_error_set_errno(errcode, "pthread_create");
5849 
5850 		halfdelay(1); /* fast refresh while annotating  */
5851 	}
5852 
5853 	if (s->blame_complete)
5854 		halfdelay(10); /* disable fast refresh */
5855 
5856 	err = draw_blame(view);
5857 
5858 	view_border(view);
5859 	return err;
5860 }
5861 
5862 static const struct got_error *
5863 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5864     struct got_repository *repo, struct got_object_id *id)
5865 {
5866 	struct tog_view		*log_view;
5867 	const struct got_error	*err = NULL;
5868 
5869 	*new_view = NULL;
5870 
5871 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5872 	if (log_view == NULL)
5873 		return got_error_from_errno("view_open");
5874 
5875 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5876 	if (err)
5877 		view_close(log_view);
5878 	else
5879 		*new_view = log_view;
5880 
5881 	return err;
5882 }
5883 
5884 static const struct got_error *
5885 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5886 {
5887 	const struct got_error *err = NULL, *thread_err = NULL;
5888 	struct tog_view *diff_view;
5889 	struct tog_blame_view_state *s = &view->state.blame;
5890 	int eos, nscroll, begin_y = 0, begin_x = 0;
5891 
5892 	eos = nscroll = view->nlines - 2;
5893 	if (view_is_hsplit_top(view))
5894 		--eos;  /* border */
5895 
5896 	switch (ch) {
5897 	case '0':
5898 		view->x = 0;
5899 		break;
5900 	case '$':
5901 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5902 		view->count = 0;
5903 		break;
5904 	case KEY_RIGHT:
5905 	case 'l':
5906 		if (view->x + view->ncols / 3 < view->maxx)
5907 			view->x += 2;  /* move two columns right */
5908 		else
5909 			view->count = 0;
5910 		break;
5911 	case KEY_LEFT:
5912 	case 'h':
5913 		view->x -= MIN(view->x, 2);  /* move two columns back */
5914 		if (view->x <= 0)
5915 			view->count = 0;
5916 		break;
5917 	case 'q':
5918 		s->done = 1;
5919 		break;
5920 	case 'g':
5921 	case KEY_HOME:
5922 		s->selected_line = 1;
5923 		s->first_displayed_line = 1;
5924 		view->count = 0;
5925 		break;
5926 	case 'G':
5927 	case KEY_END:
5928 		if (s->blame.nlines < eos) {
5929 			s->selected_line = s->blame.nlines;
5930 			s->first_displayed_line = 1;
5931 		} else {
5932 			s->selected_line = eos;
5933 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5934 		}
5935 		view->count = 0;
5936 		break;
5937 	case 'k':
5938 	case KEY_UP:
5939 	case CTRL('p'):
5940 		if (s->selected_line > 1)
5941 			s->selected_line--;
5942 		else if (s->selected_line == 1 &&
5943 		    s->first_displayed_line > 1)
5944 			s->first_displayed_line--;
5945 		else
5946 			view->count = 0;
5947 		break;
5948 	case CTRL('u'):
5949 	case 'u':
5950 		nscroll /= 2;
5951 		/* FALL THROUGH */
5952 	case KEY_PPAGE:
5953 	case CTRL('b'):
5954 	case 'b':
5955 		if (s->first_displayed_line == 1) {
5956 			if (view->count > 1)
5957 				nscroll += nscroll;
5958 			s->selected_line = MAX(1, s->selected_line - nscroll);
5959 			view->count = 0;
5960 			break;
5961 		}
5962 		if (s->first_displayed_line > nscroll)
5963 			s->first_displayed_line -= nscroll;
5964 		else
5965 			s->first_displayed_line = 1;
5966 		break;
5967 	case 'j':
5968 	case KEY_DOWN:
5969 	case CTRL('n'):
5970 		if (s->selected_line < eos && s->first_displayed_line +
5971 		    s->selected_line <= s->blame.nlines)
5972 			s->selected_line++;
5973 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5974 			s->first_displayed_line++;
5975 		else
5976 			view->count = 0;
5977 		break;
5978 	case 'c':
5979 	case 'p': {
5980 		struct got_object_id *id = NULL;
5981 
5982 		view->count = 0;
5983 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5984 		    s->first_displayed_line, s->selected_line);
5985 		if (id == NULL)
5986 			break;
5987 		if (ch == 'p') {
5988 			struct got_commit_object *commit, *pcommit;
5989 			struct got_object_qid *pid;
5990 			struct got_object_id *blob_id = NULL;
5991 			int obj_type;
5992 			err = got_object_open_as_commit(&commit,
5993 			    s->repo, id);
5994 			if (err)
5995 				break;
5996 			pid = STAILQ_FIRST(
5997 			    got_object_commit_get_parent_ids(commit));
5998 			if (pid == NULL) {
5999 				got_object_commit_close(commit);
6000 				break;
6001 			}
6002 			/* Check if path history ends here. */
6003 			err = got_object_open_as_commit(&pcommit,
6004 			    s->repo, &pid->id);
6005 			if (err)
6006 				break;
6007 			err = got_object_id_by_path(&blob_id, s->repo,
6008 			    pcommit, s->path);
6009 			got_object_commit_close(pcommit);
6010 			if (err) {
6011 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6012 					err = NULL;
6013 				got_object_commit_close(commit);
6014 				break;
6015 			}
6016 			err = got_object_get_type(&obj_type, s->repo,
6017 			    blob_id);
6018 			free(blob_id);
6019 			/* Can't blame non-blob type objects. */
6020 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6021 				got_object_commit_close(commit);
6022 				break;
6023 			}
6024 			err = got_object_qid_alloc(&s->blamed_commit,
6025 			    &pid->id);
6026 			got_object_commit_close(commit);
6027 		} else {
6028 			if (got_object_id_cmp(id,
6029 			    &s->blamed_commit->id) == 0)
6030 				break;
6031 			err = got_object_qid_alloc(&s->blamed_commit,
6032 			    id);
6033 		}
6034 		if (err)
6035 			break;
6036 		s->done = 1;
6037 		thread_err = stop_blame(&s->blame);
6038 		s->done = 0;
6039 		if (thread_err)
6040 			break;
6041 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6042 		    s->blamed_commit, entry);
6043 		err = run_blame(view);
6044 		if (err)
6045 			break;
6046 		break;
6047 	}
6048 	case 'C': {
6049 		struct got_object_qid *first;
6050 
6051 		view->count = 0;
6052 		first = STAILQ_FIRST(&s->blamed_commits);
6053 		if (!got_object_id_cmp(&first->id, s->commit_id))
6054 			break;
6055 		s->done = 1;
6056 		thread_err = stop_blame(&s->blame);
6057 		s->done = 0;
6058 		if (thread_err)
6059 			break;
6060 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6061 		got_object_qid_free(s->blamed_commit);
6062 		s->blamed_commit =
6063 		    STAILQ_FIRST(&s->blamed_commits);
6064 		err = run_blame(view);
6065 		if (err)
6066 			break;
6067 		break;
6068 	}
6069 	case 'L':
6070 		view->count = 0;
6071 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6072 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6073 		if (s->id_to_log)
6074 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6075 		break;
6076 	case KEY_ENTER:
6077 	case '\r': {
6078 		struct got_object_id *id = NULL;
6079 		struct got_object_qid *pid;
6080 		struct got_commit_object *commit = NULL;
6081 
6082 		view->count = 0;
6083 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6084 		    s->first_displayed_line, s->selected_line);
6085 		if (id == NULL)
6086 			break;
6087 		err = got_object_open_as_commit(&commit, s->repo, id);
6088 		if (err)
6089 			break;
6090 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6091 		if (*new_view) {
6092 			/* traversed from diff view, release diff resources  */
6093 			err = close_diff_view(*new_view);
6094 			if (err)
6095 				break;
6096 			diff_view = *new_view;
6097 		} else {
6098 			if (view_is_parent_view(view))
6099 				view_get_split(view, &begin_y, &begin_x);
6100 
6101 			diff_view = view_open(0, 0, begin_y, begin_x,
6102 			    TOG_VIEW_DIFF);
6103 			if (diff_view == NULL) {
6104 				got_object_commit_close(commit);
6105 				err = got_error_from_errno("view_open");
6106 				break;
6107 			}
6108 		}
6109 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6110 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6111 		got_object_commit_close(commit);
6112 		if (err) {
6113 			view_close(diff_view);
6114 			break;
6115 		}
6116 		s->last_diffed_line = s->first_displayed_line - 1 +
6117 		    s->selected_line;
6118 		if (*new_view)
6119 			break;	/* still open from active diff view */
6120 		if (view_is_parent_view(view) &&
6121 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6122 			err = view_init_hsplit(view, begin_y);
6123 			if (err)
6124 				break;
6125 		}
6126 
6127 		view->focussed = 0;
6128 		diff_view->focussed = 1;
6129 		diff_view->mode = view->mode;
6130 		diff_view->nlines = view->lines - begin_y;
6131 		if (view_is_parent_view(view)) {
6132 			view_transfer_size(diff_view, view);
6133 			err = view_close_child(view);
6134 			if (err)
6135 				break;
6136 			err = view_set_child(view, diff_view);
6137 			if (err)
6138 				break;
6139 			view->focus_child = 1;
6140 		} else
6141 			*new_view = diff_view;
6142 		if (err)
6143 			break;
6144 		break;
6145 	}
6146 	case CTRL('d'):
6147 	case 'd':
6148 		nscroll /= 2;
6149 		/* FALL THROUGH */
6150 	case KEY_NPAGE:
6151 	case CTRL('f'):
6152 	case 'f':
6153 	case ' ':
6154 		if (s->last_displayed_line >= s->blame.nlines &&
6155 		    s->selected_line >= MIN(s->blame.nlines,
6156 		    view->nlines - 2)) {
6157 			view->count = 0;
6158 			break;
6159 		}
6160 		if (s->last_displayed_line >= s->blame.nlines &&
6161 		    s->selected_line < view->nlines - 2) {
6162 			s->selected_line +=
6163 			    MIN(nscroll, s->last_displayed_line -
6164 			    s->first_displayed_line - s->selected_line + 1);
6165 		}
6166 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6167 			s->first_displayed_line += nscroll;
6168 		else
6169 			s->first_displayed_line =
6170 			    s->blame.nlines - (view->nlines - 3);
6171 		break;
6172 	case KEY_RESIZE:
6173 		if (s->selected_line > view->nlines - 2) {
6174 			s->selected_line = MIN(s->blame.nlines,
6175 			    view->nlines - 2);
6176 		}
6177 		break;
6178 	default:
6179 		view->count = 0;
6180 		break;
6181 	}
6182 	return thread_err ? thread_err : err;
6183 }
6184 
6185 static const struct got_error *
6186 reset_blame_view(struct tog_view *view)
6187 {
6188 	const struct got_error *err;
6189 	struct tog_blame_view_state *s = &view->state.blame;
6190 
6191 	view->count = 0;
6192 	s->done = 1;
6193 	err = stop_blame(&s->blame);
6194 	s->done = 0;
6195 	if (err)
6196 		return err;
6197 	return run_blame(view);
6198 }
6199 
6200 static const struct got_error *
6201 cmd_blame(int argc, char *argv[])
6202 {
6203 	const struct got_error *error;
6204 	struct got_repository *repo = NULL;
6205 	struct got_worktree *worktree = NULL;
6206 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6207 	char *link_target = NULL;
6208 	struct got_object_id *commit_id = NULL;
6209 	struct got_commit_object *commit = NULL;
6210 	char *commit_id_str = NULL;
6211 	int ch;
6212 	struct tog_view *view;
6213 	int *pack_fds = NULL;
6214 
6215 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6216 		switch (ch) {
6217 		case 'c':
6218 			commit_id_str = optarg;
6219 			break;
6220 		case 'r':
6221 			repo_path = realpath(optarg, NULL);
6222 			if (repo_path == NULL)
6223 				return got_error_from_errno2("realpath",
6224 				    optarg);
6225 			break;
6226 		default:
6227 			usage_blame();
6228 			/* NOTREACHED */
6229 		}
6230 	}
6231 
6232 	argc -= optind;
6233 	argv += optind;
6234 
6235 	if (argc != 1)
6236 		usage_blame();
6237 
6238 	error = got_repo_pack_fds_open(&pack_fds);
6239 	if (error != NULL)
6240 		goto done;
6241 
6242 	if (repo_path == NULL) {
6243 		cwd = getcwd(NULL, 0);
6244 		if (cwd == NULL)
6245 			return got_error_from_errno("getcwd");
6246 		error = got_worktree_open(&worktree, cwd);
6247 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6248 			goto done;
6249 		if (worktree)
6250 			repo_path =
6251 			    strdup(got_worktree_get_repo_path(worktree));
6252 		else
6253 			repo_path = strdup(cwd);
6254 		if (repo_path == NULL) {
6255 			error = got_error_from_errno("strdup");
6256 			goto done;
6257 		}
6258 	}
6259 
6260 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6261 	if (error != NULL)
6262 		goto done;
6263 
6264 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6265 	    worktree);
6266 	if (error)
6267 		goto done;
6268 
6269 	init_curses();
6270 
6271 	error = apply_unveil(got_repo_get_path(repo), NULL);
6272 	if (error)
6273 		goto done;
6274 
6275 	error = tog_load_refs(repo, 0);
6276 	if (error)
6277 		goto done;
6278 
6279 	if (commit_id_str == NULL) {
6280 		struct got_reference *head_ref;
6281 		error = got_ref_open(&head_ref, repo, worktree ?
6282 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6283 		if (error != NULL)
6284 			goto done;
6285 		error = got_ref_resolve(&commit_id, repo, head_ref);
6286 		got_ref_close(head_ref);
6287 	} else {
6288 		error = got_repo_match_object_id(&commit_id, NULL,
6289 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6290 	}
6291 	if (error != NULL)
6292 		goto done;
6293 
6294 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6295 	if (view == NULL) {
6296 		error = got_error_from_errno("view_open");
6297 		goto done;
6298 	}
6299 
6300 	error = got_object_open_as_commit(&commit, repo, commit_id);
6301 	if (error)
6302 		goto done;
6303 
6304 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6305 	    commit, repo);
6306 	if (error)
6307 		goto done;
6308 
6309 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6310 	    commit_id, repo);
6311 	if (error)
6312 		goto done;
6313 	if (worktree) {
6314 		/* Release work tree lock. */
6315 		got_worktree_close(worktree);
6316 		worktree = NULL;
6317 	}
6318 	error = view_loop(view);
6319 done:
6320 	free(repo_path);
6321 	free(in_repo_path);
6322 	free(link_target);
6323 	free(cwd);
6324 	free(commit_id);
6325 	if (commit)
6326 		got_object_commit_close(commit);
6327 	if (worktree)
6328 		got_worktree_close(worktree);
6329 	if (repo) {
6330 		const struct got_error *close_err = got_repo_close(repo);
6331 		if (error == NULL)
6332 			error = close_err;
6333 	}
6334 	if (pack_fds) {
6335 		const struct got_error *pack_err =
6336 		    got_repo_pack_fds_close(pack_fds);
6337 		if (error == NULL)
6338 			error = pack_err;
6339 	}
6340 	tog_free_refs();
6341 	return error;
6342 }
6343 
6344 static const struct got_error *
6345 draw_tree_entries(struct tog_view *view, const char *parent_path)
6346 {
6347 	struct tog_tree_view_state *s = &view->state.tree;
6348 	const struct got_error *err = NULL;
6349 	struct got_tree_entry *te;
6350 	wchar_t *wline;
6351 	struct tog_color *tc;
6352 	int width, n, nentries, i = 1;
6353 	int limit = view->nlines;
6354 
6355 	s->ndisplayed = 0;
6356 	if (view_is_hsplit_top(view))
6357 		--limit;  /* border */
6358 
6359 	werase(view->window);
6360 
6361 	if (limit == 0)
6362 		return NULL;
6363 
6364 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6365 	    0, 0);
6366 	if (err)
6367 		return err;
6368 	if (view_needs_focus_indication(view))
6369 		wstandout(view->window);
6370 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6371 	if (tc)
6372 		wattr_on(view->window,
6373 		    COLOR_PAIR(tc->colorpair), NULL);
6374 	waddwstr(view->window, wline);
6375 	if (tc)
6376 		wattr_off(view->window,
6377 		    COLOR_PAIR(tc->colorpair), NULL);
6378 	if (view_needs_focus_indication(view))
6379 		wstandend(view->window);
6380 	free(wline);
6381 	wline = NULL;
6382 
6383 	if (s->selected_entry) {
6384 		i = got_tree_entry_get_index(s->selected_entry);
6385 		i += s->tree == s->root ? 1 : 2;  /* account for ".." entry */
6386 	}
6387 	nentries = got_object_tree_get_nentries(s->tree);
6388 	wprintw(view->window, " [%d/%d]", i,
6389 	    nentries + (s->tree == s->root ? 0 : 1));  /* ".." in !root tree */
6390 
6391 	if (width < view->ncols - 1)
6392 		waddch(view->window, '\n');
6393 	if (--limit <= 0)
6394 		return NULL;
6395 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6396 	    0, 0);
6397 	if (err)
6398 		return err;
6399 	waddwstr(view->window, wline);
6400 	free(wline);
6401 	wline = NULL;
6402 	if (width < view->ncols - 1)
6403 		waddch(view->window, '\n');
6404 	if (--limit <= 0)
6405 		return NULL;
6406 	waddch(view->window, '\n');
6407 	if (--limit <= 0)
6408 		return NULL;
6409 
6410 	if (s->first_displayed_entry == NULL) {
6411 		te = got_object_tree_get_first_entry(s->tree);
6412 		if (s->selected == 0) {
6413 			if (view->focussed)
6414 				wstandout(view->window);
6415 			s->selected_entry = NULL;
6416 		}
6417 		waddstr(view->window, "  ..\n");	/* parent directory */
6418 		if (s->selected == 0 && view->focussed)
6419 			wstandend(view->window);
6420 		s->ndisplayed++;
6421 		if (--limit <= 0)
6422 			return NULL;
6423 		n = 1;
6424 	} else {
6425 		n = 0;
6426 		te = s->first_displayed_entry;
6427 	}
6428 
6429 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6430 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6431 		const char *modestr = "";
6432 		mode_t mode;
6433 
6434 		te = got_object_tree_get_entry(s->tree, i);
6435 		mode = got_tree_entry_get_mode(te);
6436 
6437 		if (s->show_ids) {
6438 			err = got_object_id_str(&id_str,
6439 			    got_tree_entry_get_id(te));
6440 			if (err)
6441 				return got_error_from_errno(
6442 				    "got_object_id_str");
6443 		}
6444 		if (got_object_tree_entry_is_submodule(te))
6445 			modestr = "$";
6446 		else if (S_ISLNK(mode)) {
6447 			int i;
6448 
6449 			err = got_tree_entry_get_symlink_target(&link_target,
6450 			    te, s->repo);
6451 			if (err) {
6452 				free(id_str);
6453 				return err;
6454 			}
6455 			for (i = 0; i < strlen(link_target); i++) {
6456 				if (!isprint((unsigned char)link_target[i]))
6457 					link_target[i] = '?';
6458 			}
6459 			modestr = "@";
6460 		}
6461 		else if (S_ISDIR(mode))
6462 			modestr = "/";
6463 		else if (mode & S_IXUSR)
6464 			modestr = "*";
6465 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6466 		    got_tree_entry_get_name(te), modestr,
6467 		    link_target ? " -> ": "",
6468 		    link_target ? link_target : "") == -1) {
6469 			free(id_str);
6470 			free(link_target);
6471 			return got_error_from_errno("asprintf");
6472 		}
6473 		free(id_str);
6474 		free(link_target);
6475 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6476 		    0, 0);
6477 		if (err) {
6478 			free(line);
6479 			break;
6480 		}
6481 		if (n == s->selected) {
6482 			if (view->focussed)
6483 				wstandout(view->window);
6484 			s->selected_entry = te;
6485 		}
6486 		tc = match_color(&s->colors, line);
6487 		if (tc)
6488 			wattr_on(view->window,
6489 			    COLOR_PAIR(tc->colorpair), NULL);
6490 		waddwstr(view->window, wline);
6491 		if (tc)
6492 			wattr_off(view->window,
6493 			    COLOR_PAIR(tc->colorpair), NULL);
6494 		if (width < view->ncols - 1)
6495 			waddch(view->window, '\n');
6496 		if (n == s->selected && view->focussed)
6497 			wstandend(view->window);
6498 		free(line);
6499 		free(wline);
6500 		wline = NULL;
6501 		n++;
6502 		s->ndisplayed++;
6503 		s->last_displayed_entry = te;
6504 		if (--limit <= 0)
6505 			break;
6506 	}
6507 
6508 	return err;
6509 }
6510 
6511 static void
6512 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6513 {
6514 	struct got_tree_entry *te;
6515 	int isroot = s->tree == s->root;
6516 	int i = 0;
6517 
6518 	if (s->first_displayed_entry == NULL)
6519 		return;
6520 
6521 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6522 	while (i++ < maxscroll) {
6523 		if (te == NULL) {
6524 			if (!isroot)
6525 				s->first_displayed_entry = NULL;
6526 			break;
6527 		}
6528 		s->first_displayed_entry = te;
6529 		te = got_tree_entry_get_prev(s->tree, te);
6530 	}
6531 }
6532 
6533 static const struct got_error *
6534 tree_scroll_down(struct tog_view *view, int maxscroll)
6535 {
6536 	struct tog_tree_view_state *s = &view->state.tree;
6537 	struct got_tree_entry *next, *last;
6538 	int n = 0;
6539 
6540 	if (s->first_displayed_entry)
6541 		next = got_tree_entry_get_next(s->tree,
6542 		    s->first_displayed_entry);
6543 	else
6544 		next = got_object_tree_get_first_entry(s->tree);
6545 
6546 	last = s->last_displayed_entry;
6547 	while (next && n++ < maxscroll) {
6548 		if (last) {
6549 			s->last_displayed_entry = last;
6550 			last = got_tree_entry_get_next(s->tree, last);
6551 		}
6552 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6553 			s->first_displayed_entry = next;
6554 			next = got_tree_entry_get_next(s->tree, next);
6555 		}
6556 	}
6557 
6558 	return NULL;
6559 }
6560 
6561 static const struct got_error *
6562 tree_entry_path(char **path, struct tog_parent_trees *parents,
6563     struct got_tree_entry *te)
6564 {
6565 	const struct got_error *err = NULL;
6566 	struct tog_parent_tree *pt;
6567 	size_t len = 2; /* for leading slash and NUL */
6568 
6569 	TAILQ_FOREACH(pt, parents, entry)
6570 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6571 		    + 1 /* slash */;
6572 	if (te)
6573 		len += strlen(got_tree_entry_get_name(te));
6574 
6575 	*path = calloc(1, len);
6576 	if (path == NULL)
6577 		return got_error_from_errno("calloc");
6578 
6579 	(*path)[0] = '/';
6580 	pt = TAILQ_LAST(parents, tog_parent_trees);
6581 	while (pt) {
6582 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6583 		if (strlcat(*path, name, len) >= len) {
6584 			err = got_error(GOT_ERR_NO_SPACE);
6585 			goto done;
6586 		}
6587 		if (strlcat(*path, "/", len) >= len) {
6588 			err = got_error(GOT_ERR_NO_SPACE);
6589 			goto done;
6590 		}
6591 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6592 	}
6593 	if (te) {
6594 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6595 			err = got_error(GOT_ERR_NO_SPACE);
6596 			goto done;
6597 		}
6598 	}
6599 done:
6600 	if (err) {
6601 		free(*path);
6602 		*path = NULL;
6603 	}
6604 	return err;
6605 }
6606 
6607 static const struct got_error *
6608 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6609     struct got_tree_entry *te, struct tog_parent_trees *parents,
6610     struct got_object_id *commit_id, struct got_repository *repo)
6611 {
6612 	const struct got_error *err = NULL;
6613 	char *path;
6614 	struct tog_view *blame_view;
6615 
6616 	*new_view = NULL;
6617 
6618 	err = tree_entry_path(&path, parents, te);
6619 	if (err)
6620 		return err;
6621 
6622 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6623 	if (blame_view == NULL) {
6624 		err = got_error_from_errno("view_open");
6625 		goto done;
6626 	}
6627 
6628 	err = open_blame_view(blame_view, path, commit_id, repo);
6629 	if (err) {
6630 		if (err->code == GOT_ERR_CANCELLED)
6631 			err = NULL;
6632 		view_close(blame_view);
6633 	} else
6634 		*new_view = blame_view;
6635 done:
6636 	free(path);
6637 	return err;
6638 }
6639 
6640 static const struct got_error *
6641 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6642     struct tog_tree_view_state *s)
6643 {
6644 	struct tog_view *log_view;
6645 	const struct got_error *err = NULL;
6646 	char *path;
6647 
6648 	*new_view = NULL;
6649 
6650 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6651 	if (log_view == NULL)
6652 		return got_error_from_errno("view_open");
6653 
6654 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6655 	if (err)
6656 		return err;
6657 
6658 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6659 	    path, 0);
6660 	if (err)
6661 		view_close(log_view);
6662 	else
6663 		*new_view = log_view;
6664 	free(path);
6665 	return err;
6666 }
6667 
6668 static const struct got_error *
6669 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6670     const char *head_ref_name, struct got_repository *repo)
6671 {
6672 	const struct got_error *err = NULL;
6673 	char *commit_id_str = NULL;
6674 	struct tog_tree_view_state *s = &view->state.tree;
6675 	struct got_commit_object *commit = NULL;
6676 
6677 	TAILQ_INIT(&s->parents);
6678 	STAILQ_INIT(&s->colors);
6679 
6680 	s->commit_id = got_object_id_dup(commit_id);
6681 	if (s->commit_id == NULL)
6682 		return got_error_from_errno("got_object_id_dup");
6683 
6684 	err = got_object_open_as_commit(&commit, repo, commit_id);
6685 	if (err)
6686 		goto done;
6687 
6688 	/*
6689 	 * The root is opened here and will be closed when the view is closed.
6690 	 * Any visited subtrees and their path-wise parents are opened and
6691 	 * closed on demand.
6692 	 */
6693 	err = got_object_open_as_tree(&s->root, repo,
6694 	    got_object_commit_get_tree_id(commit));
6695 	if (err)
6696 		goto done;
6697 	s->tree = s->root;
6698 
6699 	err = got_object_id_str(&commit_id_str, commit_id);
6700 	if (err != NULL)
6701 		goto done;
6702 
6703 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6704 		err = got_error_from_errno("asprintf");
6705 		goto done;
6706 	}
6707 
6708 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6709 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6710 	if (head_ref_name) {
6711 		s->head_ref_name = strdup(head_ref_name);
6712 		if (s->head_ref_name == NULL) {
6713 			err = got_error_from_errno("strdup");
6714 			goto done;
6715 		}
6716 	}
6717 	s->repo = repo;
6718 
6719 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6720 		err = add_color(&s->colors, "\\$$",
6721 		    TOG_COLOR_TREE_SUBMODULE,
6722 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6723 		if (err)
6724 			goto done;
6725 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6726 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6727 		if (err)
6728 			goto done;
6729 		err = add_color(&s->colors, "/$",
6730 		    TOG_COLOR_TREE_DIRECTORY,
6731 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6732 		if (err)
6733 			goto done;
6734 
6735 		err = add_color(&s->colors, "\\*$",
6736 		    TOG_COLOR_TREE_EXECUTABLE,
6737 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6738 		if (err)
6739 			goto done;
6740 
6741 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6742 		    get_color_value("TOG_COLOR_COMMIT"));
6743 		if (err)
6744 			goto done;
6745 	}
6746 
6747 	view->show = show_tree_view;
6748 	view->input = input_tree_view;
6749 	view->close = close_tree_view;
6750 	view->search_start = search_start_tree_view;
6751 	view->search_next = search_next_tree_view;
6752 done:
6753 	free(commit_id_str);
6754 	if (commit)
6755 		got_object_commit_close(commit);
6756 	if (err)
6757 		close_tree_view(view);
6758 	return err;
6759 }
6760 
6761 static const struct got_error *
6762 close_tree_view(struct tog_view *view)
6763 {
6764 	struct tog_tree_view_state *s = &view->state.tree;
6765 
6766 	free_colors(&s->colors);
6767 	free(s->tree_label);
6768 	s->tree_label = NULL;
6769 	free(s->commit_id);
6770 	s->commit_id = NULL;
6771 	free(s->head_ref_name);
6772 	s->head_ref_name = NULL;
6773 	while (!TAILQ_EMPTY(&s->parents)) {
6774 		struct tog_parent_tree *parent;
6775 		parent = TAILQ_FIRST(&s->parents);
6776 		TAILQ_REMOVE(&s->parents, parent, entry);
6777 		if (parent->tree != s->root)
6778 			got_object_tree_close(parent->tree);
6779 		free(parent);
6780 
6781 	}
6782 	if (s->tree != NULL && s->tree != s->root)
6783 		got_object_tree_close(s->tree);
6784 	if (s->root)
6785 		got_object_tree_close(s->root);
6786 	return NULL;
6787 }
6788 
6789 static const struct got_error *
6790 search_start_tree_view(struct tog_view *view)
6791 {
6792 	struct tog_tree_view_state *s = &view->state.tree;
6793 
6794 	s->matched_entry = NULL;
6795 	return NULL;
6796 }
6797 
6798 static int
6799 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6800 {
6801 	regmatch_t regmatch;
6802 
6803 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6804 	    0) == 0;
6805 }
6806 
6807 static const struct got_error *
6808 search_next_tree_view(struct tog_view *view)
6809 {
6810 	struct tog_tree_view_state *s = &view->state.tree;
6811 	struct got_tree_entry *te = NULL;
6812 
6813 	if (!view->searching) {
6814 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6815 		return NULL;
6816 	}
6817 
6818 	if (s->matched_entry) {
6819 		if (view->searching == TOG_SEARCH_FORWARD) {
6820 			if (s->selected_entry)
6821 				te = got_tree_entry_get_next(s->tree,
6822 				    s->selected_entry);
6823 			else
6824 				te = got_object_tree_get_first_entry(s->tree);
6825 		} else {
6826 			if (s->selected_entry == NULL)
6827 				te = got_object_tree_get_last_entry(s->tree);
6828 			else
6829 				te = got_tree_entry_get_prev(s->tree,
6830 				    s->selected_entry);
6831 		}
6832 	} else {
6833 		if (s->selected_entry)
6834 			te = s->selected_entry;
6835 		else if (view->searching == TOG_SEARCH_FORWARD)
6836 			te = got_object_tree_get_first_entry(s->tree);
6837 		else
6838 			te = got_object_tree_get_last_entry(s->tree);
6839 	}
6840 
6841 	while (1) {
6842 		if (te == NULL) {
6843 			if (s->matched_entry == NULL) {
6844 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6845 				return NULL;
6846 			}
6847 			if (view->searching == TOG_SEARCH_FORWARD)
6848 				te = got_object_tree_get_first_entry(s->tree);
6849 			else
6850 				te = got_object_tree_get_last_entry(s->tree);
6851 		}
6852 
6853 		if (match_tree_entry(te, &view->regex)) {
6854 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6855 			s->matched_entry = te;
6856 			break;
6857 		}
6858 
6859 		if (view->searching == TOG_SEARCH_FORWARD)
6860 			te = got_tree_entry_get_next(s->tree, te);
6861 		else
6862 			te = got_tree_entry_get_prev(s->tree, te);
6863 	}
6864 
6865 	if (s->matched_entry) {
6866 		s->first_displayed_entry = s->matched_entry;
6867 		s->selected = 0;
6868 	}
6869 
6870 	return NULL;
6871 }
6872 
6873 static const struct got_error *
6874 show_tree_view(struct tog_view *view)
6875 {
6876 	const struct got_error *err = NULL;
6877 	struct tog_tree_view_state *s = &view->state.tree;
6878 	char *parent_path;
6879 
6880 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6881 	if (err)
6882 		return err;
6883 
6884 	err = draw_tree_entries(view, parent_path);
6885 	free(parent_path);
6886 
6887 	view_border(view);
6888 	return err;
6889 }
6890 
6891 static const struct got_error *
6892 tree_goto_line(struct tog_view *view, int nlines)
6893 {
6894 	const struct got_error		 *err = NULL;
6895 	struct tog_tree_view_state	 *s = &view->state.tree;
6896 	struct got_tree_entry		**fte, **lte, **ste;
6897 	int				  g, last, first = 1, i = 1;
6898 	int				  root = s->tree == s->root;
6899 	int				  off = root ? 1 : 2;
6900 
6901 	g = view->gline;
6902 	view->gline = 0;
6903 
6904 	if (g == 0)
6905 		g = 1;
6906 	else if (g > got_object_tree_get_nentries(s->tree))
6907 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6908 
6909 	fte = &s->first_displayed_entry;
6910 	lte = &s->last_displayed_entry;
6911 	ste = &s->selected_entry;
6912 
6913 	if (*fte != NULL) {
6914 		first = got_tree_entry_get_index(*fte);
6915 		first += off;  /* account for ".." */
6916 	}
6917 	last = got_tree_entry_get_index(*lte);
6918 	last += off;
6919 
6920 	if (g >= first && g <= last && g - first < nlines) {
6921 		s->selected = g - first;
6922 		return NULL;	/* gline is on the current page */
6923 	}
6924 
6925 	if (*ste != NULL) {
6926 		i = got_tree_entry_get_index(*ste);
6927 		i += off;
6928 	}
6929 
6930 	if (i < g) {
6931 		err = tree_scroll_down(view, g - i);
6932 		if (err)
6933 			return err;
6934 		if (got_tree_entry_get_index(*lte) >=
6935 		    got_object_tree_get_nentries(s->tree) - 1 &&
6936 		    first + s->selected < g &&
6937 		    s->selected < s->ndisplayed - 1) {
6938 			first = got_tree_entry_get_index(*fte);
6939 			first += off;
6940 			s->selected = g - first;
6941 		}
6942 	} else if (i > g)
6943 		tree_scroll_up(s, i - g);
6944 
6945 	if (g < nlines &&
6946 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6947 		s->selected = g - 1;
6948 
6949 	return NULL;
6950 }
6951 
6952 static const struct got_error *
6953 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6954 {
6955 	const struct got_error *err = NULL;
6956 	struct tog_tree_view_state *s = &view->state.tree;
6957 	struct got_tree_entry *te;
6958 	int n, nscroll = view->nlines - 3;
6959 
6960 	if (view->gline)
6961 		return tree_goto_line(view, nscroll);
6962 
6963 	switch (ch) {
6964 	case 'i':
6965 		s->show_ids = !s->show_ids;
6966 		view->count = 0;
6967 		break;
6968 	case 'L':
6969 		view->count = 0;
6970 		if (!s->selected_entry)
6971 			break;
6972 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6973 		break;
6974 	case 'R':
6975 		view->count = 0;
6976 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6977 		break;
6978 	case 'g':
6979 	case KEY_HOME:
6980 		s->selected = 0;
6981 		view->count = 0;
6982 		if (s->tree == s->root)
6983 			s->first_displayed_entry =
6984 			    got_object_tree_get_first_entry(s->tree);
6985 		else
6986 			s->first_displayed_entry = NULL;
6987 		break;
6988 	case 'G':
6989 	case KEY_END: {
6990 		int eos = view->nlines - 3;
6991 
6992 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6993 			--eos;  /* border */
6994 		s->selected = 0;
6995 		view->count = 0;
6996 		te = got_object_tree_get_last_entry(s->tree);
6997 		for (n = 0; n < eos; n++) {
6998 			if (te == NULL) {
6999 				if (s->tree != s->root) {
7000 					s->first_displayed_entry = NULL;
7001 					n++;
7002 				}
7003 				break;
7004 			}
7005 			s->first_displayed_entry = te;
7006 			te = got_tree_entry_get_prev(s->tree, te);
7007 		}
7008 		if (n > 0)
7009 			s->selected = n - 1;
7010 		break;
7011 	}
7012 	case 'k':
7013 	case KEY_UP:
7014 	case CTRL('p'):
7015 		if (s->selected > 0) {
7016 			s->selected--;
7017 			break;
7018 		}
7019 		tree_scroll_up(s, 1);
7020 		if (s->selected_entry == NULL ||
7021 		    (s->tree == s->root && s->selected_entry ==
7022 		     got_object_tree_get_first_entry(s->tree)))
7023 			view->count = 0;
7024 		break;
7025 	case CTRL('u'):
7026 	case 'u':
7027 		nscroll /= 2;
7028 		/* FALL THROUGH */
7029 	case KEY_PPAGE:
7030 	case CTRL('b'):
7031 	case 'b':
7032 		if (s->tree == s->root) {
7033 			if (got_object_tree_get_first_entry(s->tree) ==
7034 			    s->first_displayed_entry)
7035 				s->selected -= MIN(s->selected, nscroll);
7036 		} else {
7037 			if (s->first_displayed_entry == NULL)
7038 				s->selected -= MIN(s->selected, nscroll);
7039 		}
7040 		tree_scroll_up(s, MAX(0, nscroll));
7041 		if (s->selected_entry == NULL ||
7042 		    (s->tree == s->root && s->selected_entry ==
7043 		     got_object_tree_get_first_entry(s->tree)))
7044 			view->count = 0;
7045 		break;
7046 	case 'j':
7047 	case KEY_DOWN:
7048 	case CTRL('n'):
7049 		if (s->selected < s->ndisplayed - 1) {
7050 			s->selected++;
7051 			break;
7052 		}
7053 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7054 		    == NULL) {
7055 			/* can't scroll any further */
7056 			view->count = 0;
7057 			break;
7058 		}
7059 		tree_scroll_down(view, 1);
7060 		break;
7061 	case CTRL('d'):
7062 	case 'd':
7063 		nscroll /= 2;
7064 		/* FALL THROUGH */
7065 	case KEY_NPAGE:
7066 	case CTRL('f'):
7067 	case 'f':
7068 	case ' ':
7069 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7070 		    == NULL) {
7071 			/* can't scroll any further; move cursor down */
7072 			if (s->selected < s->ndisplayed - 1)
7073 				s->selected += MIN(nscroll,
7074 				    s->ndisplayed - s->selected - 1);
7075 			else
7076 				view->count = 0;
7077 			break;
7078 		}
7079 		tree_scroll_down(view, nscroll);
7080 		break;
7081 	case KEY_ENTER:
7082 	case '\r':
7083 	case KEY_BACKSPACE:
7084 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7085 			struct tog_parent_tree *parent;
7086 			/* user selected '..' */
7087 			if (s->tree == s->root) {
7088 				view->count = 0;
7089 				break;
7090 			}
7091 			parent = TAILQ_FIRST(&s->parents);
7092 			TAILQ_REMOVE(&s->parents, parent,
7093 			    entry);
7094 			got_object_tree_close(s->tree);
7095 			s->tree = parent->tree;
7096 			s->first_displayed_entry =
7097 			    parent->first_displayed_entry;
7098 			s->selected_entry =
7099 			    parent->selected_entry;
7100 			s->selected = parent->selected;
7101 			if (s->selected > view->nlines - 3) {
7102 				err = offset_selection_down(view);
7103 				if (err)
7104 					break;
7105 			}
7106 			free(parent);
7107 		} else if (S_ISDIR(got_tree_entry_get_mode(
7108 		    s->selected_entry))) {
7109 			struct got_tree_object *subtree;
7110 			view->count = 0;
7111 			err = got_object_open_as_tree(&subtree, s->repo,
7112 			    got_tree_entry_get_id(s->selected_entry));
7113 			if (err)
7114 				break;
7115 			err = tree_view_visit_subtree(s, subtree);
7116 			if (err) {
7117 				got_object_tree_close(subtree);
7118 				break;
7119 			}
7120 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7121 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7122 		break;
7123 	case KEY_RESIZE:
7124 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7125 			s->selected = view->nlines - 4;
7126 		view->count = 0;
7127 		break;
7128 	default:
7129 		view->count = 0;
7130 		break;
7131 	}
7132 
7133 	return err;
7134 }
7135 
7136 __dead static void
7137 usage_tree(void)
7138 {
7139 	endwin();
7140 	fprintf(stderr,
7141 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7142 	    getprogname());
7143 	exit(1);
7144 }
7145 
7146 static const struct got_error *
7147 cmd_tree(int argc, char *argv[])
7148 {
7149 	const struct got_error *error;
7150 	struct got_repository *repo = NULL;
7151 	struct got_worktree *worktree = NULL;
7152 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7153 	struct got_object_id *commit_id = NULL;
7154 	struct got_commit_object *commit = NULL;
7155 	const char *commit_id_arg = NULL;
7156 	char *label = NULL;
7157 	struct got_reference *ref = NULL;
7158 	const char *head_ref_name = NULL;
7159 	int ch;
7160 	struct tog_view *view;
7161 	int *pack_fds = NULL;
7162 
7163 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7164 		switch (ch) {
7165 		case 'c':
7166 			commit_id_arg = optarg;
7167 			break;
7168 		case 'r':
7169 			repo_path = realpath(optarg, NULL);
7170 			if (repo_path == NULL)
7171 				return got_error_from_errno2("realpath",
7172 				    optarg);
7173 			break;
7174 		default:
7175 			usage_tree();
7176 			/* NOTREACHED */
7177 		}
7178 	}
7179 
7180 	argc -= optind;
7181 	argv += optind;
7182 
7183 	if (argc > 1)
7184 		usage_tree();
7185 
7186 	error = got_repo_pack_fds_open(&pack_fds);
7187 	if (error != NULL)
7188 		goto done;
7189 
7190 	if (repo_path == NULL) {
7191 		cwd = getcwd(NULL, 0);
7192 		if (cwd == NULL)
7193 			return got_error_from_errno("getcwd");
7194 		error = got_worktree_open(&worktree, cwd);
7195 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7196 			goto done;
7197 		if (worktree)
7198 			repo_path =
7199 			    strdup(got_worktree_get_repo_path(worktree));
7200 		else
7201 			repo_path = strdup(cwd);
7202 		if (repo_path == NULL) {
7203 			error = got_error_from_errno("strdup");
7204 			goto done;
7205 		}
7206 	}
7207 
7208 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7209 	if (error != NULL)
7210 		goto done;
7211 
7212 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7213 	    repo, worktree);
7214 	if (error)
7215 		goto done;
7216 
7217 	init_curses();
7218 
7219 	error = apply_unveil(got_repo_get_path(repo), NULL);
7220 	if (error)
7221 		goto done;
7222 
7223 	error = tog_load_refs(repo, 0);
7224 	if (error)
7225 		goto done;
7226 
7227 	if (commit_id_arg == NULL) {
7228 		error = got_repo_match_object_id(&commit_id, &label,
7229 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7230 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7231 		if (error)
7232 			goto done;
7233 		head_ref_name = label;
7234 	} else {
7235 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7236 		if (error == NULL)
7237 			head_ref_name = got_ref_get_name(ref);
7238 		else if (error->code != GOT_ERR_NOT_REF)
7239 			goto done;
7240 		error = got_repo_match_object_id(&commit_id, NULL,
7241 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7242 		if (error)
7243 			goto done;
7244 	}
7245 
7246 	error = got_object_open_as_commit(&commit, repo, commit_id);
7247 	if (error)
7248 		goto done;
7249 
7250 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7251 	if (view == NULL) {
7252 		error = got_error_from_errno("view_open");
7253 		goto done;
7254 	}
7255 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7256 	if (error)
7257 		goto done;
7258 	if (!got_path_is_root_dir(in_repo_path)) {
7259 		error = tree_view_walk_path(&view->state.tree, commit,
7260 		    in_repo_path);
7261 		if (error)
7262 			goto done;
7263 	}
7264 
7265 	if (worktree) {
7266 		/* Release work tree lock. */
7267 		got_worktree_close(worktree);
7268 		worktree = NULL;
7269 	}
7270 	error = view_loop(view);
7271 done:
7272 	free(repo_path);
7273 	free(cwd);
7274 	free(commit_id);
7275 	free(label);
7276 	if (ref)
7277 		got_ref_close(ref);
7278 	if (repo) {
7279 		const struct got_error *close_err = got_repo_close(repo);
7280 		if (error == NULL)
7281 			error = close_err;
7282 	}
7283 	if (pack_fds) {
7284 		const struct got_error *pack_err =
7285 		    got_repo_pack_fds_close(pack_fds);
7286 		if (error == NULL)
7287 			error = pack_err;
7288 	}
7289 	tog_free_refs();
7290 	return error;
7291 }
7292 
7293 static const struct got_error *
7294 ref_view_load_refs(struct tog_ref_view_state *s)
7295 {
7296 	struct got_reflist_entry *sre;
7297 	struct tog_reflist_entry *re;
7298 
7299 	s->nrefs = 0;
7300 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7301 		if (strncmp(got_ref_get_name(sre->ref),
7302 		    "refs/got/", 9) == 0 &&
7303 		    strncmp(got_ref_get_name(sre->ref),
7304 		    "refs/got/backup/", 16) != 0)
7305 			continue;
7306 
7307 		re = malloc(sizeof(*re));
7308 		if (re == NULL)
7309 			return got_error_from_errno("malloc");
7310 
7311 		re->ref = got_ref_dup(sre->ref);
7312 		if (re->ref == NULL)
7313 			return got_error_from_errno("got_ref_dup");
7314 		re->idx = s->nrefs++;
7315 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7316 	}
7317 
7318 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7319 	return NULL;
7320 }
7321 
7322 static void
7323 ref_view_free_refs(struct tog_ref_view_state *s)
7324 {
7325 	struct tog_reflist_entry *re;
7326 
7327 	while (!TAILQ_EMPTY(&s->refs)) {
7328 		re = TAILQ_FIRST(&s->refs);
7329 		TAILQ_REMOVE(&s->refs, re, entry);
7330 		got_ref_close(re->ref);
7331 		free(re);
7332 	}
7333 }
7334 
7335 static const struct got_error *
7336 open_ref_view(struct tog_view *view, struct got_repository *repo)
7337 {
7338 	const struct got_error *err = NULL;
7339 	struct tog_ref_view_state *s = &view->state.ref;
7340 
7341 	s->selected_entry = 0;
7342 	s->repo = repo;
7343 
7344 	TAILQ_INIT(&s->refs);
7345 	STAILQ_INIT(&s->colors);
7346 
7347 	err = ref_view_load_refs(s);
7348 	if (err)
7349 		return err;
7350 
7351 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7352 		err = add_color(&s->colors, "^refs/heads/",
7353 		    TOG_COLOR_REFS_HEADS,
7354 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7355 		if (err)
7356 			goto done;
7357 
7358 		err = add_color(&s->colors, "^refs/tags/",
7359 		    TOG_COLOR_REFS_TAGS,
7360 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7361 		if (err)
7362 			goto done;
7363 
7364 		err = add_color(&s->colors, "^refs/remotes/",
7365 		    TOG_COLOR_REFS_REMOTES,
7366 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7367 		if (err)
7368 			goto done;
7369 
7370 		err = add_color(&s->colors, "^refs/got/backup/",
7371 		    TOG_COLOR_REFS_BACKUP,
7372 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7373 		if (err)
7374 			goto done;
7375 	}
7376 
7377 	view->show = show_ref_view;
7378 	view->input = input_ref_view;
7379 	view->close = close_ref_view;
7380 	view->search_start = search_start_ref_view;
7381 	view->search_next = search_next_ref_view;
7382 done:
7383 	if (err)
7384 		free_colors(&s->colors);
7385 	return err;
7386 }
7387 
7388 static const struct got_error *
7389 close_ref_view(struct tog_view *view)
7390 {
7391 	struct tog_ref_view_state *s = &view->state.ref;
7392 
7393 	ref_view_free_refs(s);
7394 	free_colors(&s->colors);
7395 
7396 	return NULL;
7397 }
7398 
7399 static const struct got_error *
7400 resolve_reflist_entry(struct got_object_id **commit_id,
7401     struct tog_reflist_entry *re, struct got_repository *repo)
7402 {
7403 	const struct got_error *err = NULL;
7404 	struct got_object_id *obj_id;
7405 	struct got_tag_object *tag = NULL;
7406 	int obj_type;
7407 
7408 	*commit_id = NULL;
7409 
7410 	err = got_ref_resolve(&obj_id, repo, re->ref);
7411 	if (err)
7412 		return err;
7413 
7414 	err = got_object_get_type(&obj_type, repo, obj_id);
7415 	if (err)
7416 		goto done;
7417 
7418 	switch (obj_type) {
7419 	case GOT_OBJ_TYPE_COMMIT:
7420 		*commit_id = obj_id;
7421 		break;
7422 	case GOT_OBJ_TYPE_TAG:
7423 		err = got_object_open_as_tag(&tag, repo, obj_id);
7424 		if (err)
7425 			goto done;
7426 		free(obj_id);
7427 		err = got_object_get_type(&obj_type, repo,
7428 		    got_object_tag_get_object_id(tag));
7429 		if (err)
7430 			goto done;
7431 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7432 			err = got_error(GOT_ERR_OBJ_TYPE);
7433 			goto done;
7434 		}
7435 		*commit_id = got_object_id_dup(
7436 		    got_object_tag_get_object_id(tag));
7437 		if (*commit_id == NULL) {
7438 			err = got_error_from_errno("got_object_id_dup");
7439 			goto done;
7440 		}
7441 		break;
7442 	default:
7443 		err = got_error(GOT_ERR_OBJ_TYPE);
7444 		break;
7445 	}
7446 
7447 done:
7448 	if (tag)
7449 		got_object_tag_close(tag);
7450 	if (err) {
7451 		free(*commit_id);
7452 		*commit_id = NULL;
7453 	}
7454 	return err;
7455 }
7456 
7457 static const struct got_error *
7458 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7459     struct tog_reflist_entry *re, struct got_repository *repo)
7460 {
7461 	struct tog_view *log_view;
7462 	const struct got_error *err = NULL;
7463 	struct got_object_id *commit_id = NULL;
7464 
7465 	*new_view = NULL;
7466 
7467 	err = resolve_reflist_entry(&commit_id, re, repo);
7468 	if (err) {
7469 		if (err->code != GOT_ERR_OBJ_TYPE)
7470 			return err;
7471 		else
7472 			return NULL;
7473 	}
7474 
7475 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7476 	if (log_view == NULL) {
7477 		err = got_error_from_errno("view_open");
7478 		goto done;
7479 	}
7480 
7481 	err = open_log_view(log_view, commit_id, repo,
7482 	    got_ref_get_name(re->ref), "", 0);
7483 done:
7484 	if (err)
7485 		view_close(log_view);
7486 	else
7487 		*new_view = log_view;
7488 	free(commit_id);
7489 	return err;
7490 }
7491 
7492 static void
7493 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7494 {
7495 	struct tog_reflist_entry *re;
7496 	int i = 0;
7497 
7498 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7499 		return;
7500 
7501 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7502 	while (i++ < maxscroll) {
7503 		if (re == NULL)
7504 			break;
7505 		s->first_displayed_entry = re;
7506 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7507 	}
7508 }
7509 
7510 static const struct got_error *
7511 ref_scroll_down(struct tog_view *view, int maxscroll)
7512 {
7513 	struct tog_ref_view_state *s = &view->state.ref;
7514 	struct tog_reflist_entry *next, *last;
7515 	int n = 0;
7516 
7517 	if (s->first_displayed_entry)
7518 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7519 	else
7520 		next = TAILQ_FIRST(&s->refs);
7521 
7522 	last = s->last_displayed_entry;
7523 	while (next && n++ < maxscroll) {
7524 		if (last) {
7525 			s->last_displayed_entry = last;
7526 			last = TAILQ_NEXT(last, entry);
7527 		}
7528 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7529 			s->first_displayed_entry = next;
7530 			next = TAILQ_NEXT(next, entry);
7531 		}
7532 	}
7533 
7534 	return NULL;
7535 }
7536 
7537 static const struct got_error *
7538 search_start_ref_view(struct tog_view *view)
7539 {
7540 	struct tog_ref_view_state *s = &view->state.ref;
7541 
7542 	s->matched_entry = NULL;
7543 	return NULL;
7544 }
7545 
7546 static int
7547 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7548 {
7549 	regmatch_t regmatch;
7550 
7551 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7552 	    0) == 0;
7553 }
7554 
7555 static const struct got_error *
7556 search_next_ref_view(struct tog_view *view)
7557 {
7558 	struct tog_ref_view_state *s = &view->state.ref;
7559 	struct tog_reflist_entry *re = NULL;
7560 
7561 	if (!view->searching) {
7562 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7563 		return NULL;
7564 	}
7565 
7566 	if (s->matched_entry) {
7567 		if (view->searching == TOG_SEARCH_FORWARD) {
7568 			if (s->selected_entry)
7569 				re = TAILQ_NEXT(s->selected_entry, entry);
7570 			else
7571 				re = TAILQ_PREV(s->selected_entry,
7572 				    tog_reflist_head, entry);
7573 		} else {
7574 			if (s->selected_entry == NULL)
7575 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7576 			else
7577 				re = TAILQ_PREV(s->selected_entry,
7578 				    tog_reflist_head, entry);
7579 		}
7580 	} else {
7581 		if (s->selected_entry)
7582 			re = s->selected_entry;
7583 		else if (view->searching == TOG_SEARCH_FORWARD)
7584 			re = TAILQ_FIRST(&s->refs);
7585 		else
7586 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7587 	}
7588 
7589 	while (1) {
7590 		if (re == NULL) {
7591 			if (s->matched_entry == NULL) {
7592 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7593 				return NULL;
7594 			}
7595 			if (view->searching == TOG_SEARCH_FORWARD)
7596 				re = TAILQ_FIRST(&s->refs);
7597 			else
7598 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7599 		}
7600 
7601 		if (match_reflist_entry(re, &view->regex)) {
7602 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7603 			s->matched_entry = re;
7604 			break;
7605 		}
7606 
7607 		if (view->searching == TOG_SEARCH_FORWARD)
7608 			re = TAILQ_NEXT(re, entry);
7609 		else
7610 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7611 	}
7612 
7613 	if (s->matched_entry) {
7614 		s->first_displayed_entry = s->matched_entry;
7615 		s->selected = 0;
7616 	}
7617 
7618 	return NULL;
7619 }
7620 
7621 static const struct got_error *
7622 show_ref_view(struct tog_view *view)
7623 {
7624 	const struct got_error *err = NULL;
7625 	struct tog_ref_view_state *s = &view->state.ref;
7626 	struct tog_reflist_entry *re;
7627 	char *line = NULL;
7628 	wchar_t *wline;
7629 	struct tog_color *tc;
7630 	int width, n;
7631 	int limit = view->nlines;
7632 
7633 	werase(view->window);
7634 
7635 	s->ndisplayed = 0;
7636 	if (view_is_hsplit_top(view))
7637 		--limit;  /* border */
7638 
7639 	if (limit == 0)
7640 		return NULL;
7641 
7642 	re = s->first_displayed_entry;
7643 
7644 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7645 	    s->nrefs) == -1)
7646 		return got_error_from_errno("asprintf");
7647 
7648 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7649 	if (err) {
7650 		free(line);
7651 		return err;
7652 	}
7653 	if (view_needs_focus_indication(view))
7654 		wstandout(view->window);
7655 	waddwstr(view->window, wline);
7656 	if (view_needs_focus_indication(view))
7657 		wstandend(view->window);
7658 	free(wline);
7659 	wline = NULL;
7660 	free(line);
7661 	line = NULL;
7662 	if (width < view->ncols - 1)
7663 		waddch(view->window, '\n');
7664 	if (--limit <= 0)
7665 		return NULL;
7666 
7667 	n = 0;
7668 	while (re && limit > 0) {
7669 		char *line = NULL;
7670 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7671 
7672 		if (s->show_date) {
7673 			struct got_commit_object *ci;
7674 			struct got_tag_object *tag;
7675 			struct got_object_id *id;
7676 			struct tm tm;
7677 			time_t t;
7678 
7679 			err = got_ref_resolve(&id, s->repo, re->ref);
7680 			if (err)
7681 				return err;
7682 			err = got_object_open_as_tag(&tag, s->repo, id);
7683 			if (err) {
7684 				if (err->code != GOT_ERR_OBJ_TYPE) {
7685 					free(id);
7686 					return err;
7687 				}
7688 				err = got_object_open_as_commit(&ci, s->repo,
7689 				    id);
7690 				if (err) {
7691 					free(id);
7692 					return err;
7693 				}
7694 				t = got_object_commit_get_committer_time(ci);
7695 				got_object_commit_close(ci);
7696 			} else {
7697 				t = got_object_tag_get_tagger_time(tag);
7698 				got_object_tag_close(tag);
7699 			}
7700 			free(id);
7701 			if (gmtime_r(&t, &tm) == NULL)
7702 				return got_error_from_errno("gmtime_r");
7703 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7704 				return got_error(GOT_ERR_NO_SPACE);
7705 		}
7706 		if (got_ref_is_symbolic(re->ref)) {
7707 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7708 			    ymd : "", got_ref_get_name(re->ref),
7709 			    got_ref_get_symref_target(re->ref)) == -1)
7710 				return got_error_from_errno("asprintf");
7711 		} else if (s->show_ids) {
7712 			struct got_object_id *id;
7713 			char *id_str;
7714 			err = got_ref_resolve(&id, s->repo, re->ref);
7715 			if (err)
7716 				return err;
7717 			err = got_object_id_str(&id_str, id);
7718 			if (err) {
7719 				free(id);
7720 				return err;
7721 			}
7722 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7723 			    got_ref_get_name(re->ref), id_str) == -1) {
7724 				err = got_error_from_errno("asprintf");
7725 				free(id);
7726 				free(id_str);
7727 				return err;
7728 			}
7729 			free(id);
7730 			free(id_str);
7731 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7732 		    got_ref_get_name(re->ref)) == -1)
7733 			return got_error_from_errno("asprintf");
7734 
7735 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7736 		    0, 0);
7737 		if (err) {
7738 			free(line);
7739 			return err;
7740 		}
7741 		if (n == s->selected) {
7742 			if (view->focussed)
7743 				wstandout(view->window);
7744 			s->selected_entry = re;
7745 		}
7746 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7747 		if (tc)
7748 			wattr_on(view->window,
7749 			    COLOR_PAIR(tc->colorpair), NULL);
7750 		waddwstr(view->window, wline);
7751 		if (tc)
7752 			wattr_off(view->window,
7753 			    COLOR_PAIR(tc->colorpair), NULL);
7754 		if (width < view->ncols - 1)
7755 			waddch(view->window, '\n');
7756 		if (n == s->selected && view->focussed)
7757 			wstandend(view->window);
7758 		free(line);
7759 		free(wline);
7760 		wline = NULL;
7761 		n++;
7762 		s->ndisplayed++;
7763 		s->last_displayed_entry = re;
7764 
7765 		limit--;
7766 		re = TAILQ_NEXT(re, entry);
7767 	}
7768 
7769 	view_border(view);
7770 	return err;
7771 }
7772 
7773 static const struct got_error *
7774 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7775     struct tog_reflist_entry *re, struct got_repository *repo)
7776 {
7777 	const struct got_error *err = NULL;
7778 	struct got_object_id *commit_id = NULL;
7779 	struct tog_view *tree_view;
7780 
7781 	*new_view = NULL;
7782 
7783 	err = resolve_reflist_entry(&commit_id, re, repo);
7784 	if (err) {
7785 		if (err->code != GOT_ERR_OBJ_TYPE)
7786 			return err;
7787 		else
7788 			return NULL;
7789 	}
7790 
7791 
7792 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7793 	if (tree_view == NULL) {
7794 		err = got_error_from_errno("view_open");
7795 		goto done;
7796 	}
7797 
7798 	err = open_tree_view(tree_view, commit_id,
7799 	    got_ref_get_name(re->ref), repo);
7800 	if (err)
7801 		goto done;
7802 
7803 	*new_view = tree_view;
7804 done:
7805 	free(commit_id);
7806 	return err;
7807 }
7808 
7809 static const struct got_error *
7810 ref_goto_line(struct tog_view *view, int nlines)
7811 {
7812 	const struct got_error		*err = NULL;
7813 	struct tog_ref_view_state	*s = &view->state.ref;
7814 	int				 g, idx = s->selected_entry->idx;
7815 
7816 	g = view->gline;
7817 	view->gline = 0;
7818 
7819 	if (g == 0)
7820 		g = 1;
7821 	else if (g > s->nrefs)
7822 		g = s->nrefs;
7823 
7824 	if (g >= s->first_displayed_entry->idx + 1 &&
7825 	    g <= s->last_displayed_entry->idx + 1 &&
7826 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7827 		s->selected = g - s->first_displayed_entry->idx - 1;
7828 		return NULL;
7829 	}
7830 
7831 	if (idx + 1 < g) {
7832 		err = ref_scroll_down(view, g - idx - 1);
7833 		if (err)
7834 			return err;
7835 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7836 		    s->first_displayed_entry->idx + s->selected < g &&
7837 		    s->selected < s->ndisplayed - 1)
7838 			s->selected = g - s->first_displayed_entry->idx - 1;
7839 	} else if (idx + 1 > g)
7840 		ref_scroll_up(s, idx - g + 1);
7841 
7842 	if (g < nlines && s->first_displayed_entry->idx == 0)
7843 		s->selected = g - 1;
7844 
7845 	return NULL;
7846 
7847 }
7848 
7849 static const struct got_error *
7850 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7851 {
7852 	const struct got_error *err = NULL;
7853 	struct tog_ref_view_state *s = &view->state.ref;
7854 	struct tog_reflist_entry *re;
7855 	int n, nscroll = view->nlines - 1;
7856 
7857 	if (view->gline)
7858 		return ref_goto_line(view, nscroll);
7859 
7860 	switch (ch) {
7861 	case 'i':
7862 		s->show_ids = !s->show_ids;
7863 		view->count = 0;
7864 		break;
7865 	case 'm':
7866 		s->show_date = !s->show_date;
7867 		view->count = 0;
7868 		break;
7869 	case 'o':
7870 		s->sort_by_date = !s->sort_by_date;
7871 		view->count = 0;
7872 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7873 		    got_ref_cmp_by_commit_timestamp_descending :
7874 		    tog_ref_cmp_by_name, s->repo);
7875 		if (err)
7876 			break;
7877 		got_reflist_object_id_map_free(tog_refs_idmap);
7878 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7879 		    &tog_refs, s->repo);
7880 		if (err)
7881 			break;
7882 		ref_view_free_refs(s);
7883 		err = ref_view_load_refs(s);
7884 		break;
7885 	case KEY_ENTER:
7886 	case '\r':
7887 		view->count = 0;
7888 		if (!s->selected_entry)
7889 			break;
7890 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7891 		break;
7892 	case 'T':
7893 		view->count = 0;
7894 		if (!s->selected_entry)
7895 			break;
7896 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7897 		break;
7898 	case 'g':
7899 	case KEY_HOME:
7900 		s->selected = 0;
7901 		view->count = 0;
7902 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7903 		break;
7904 	case 'G':
7905 	case KEY_END: {
7906 		int eos = view->nlines - 1;
7907 
7908 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7909 			--eos;  /* border */
7910 		s->selected = 0;
7911 		view->count = 0;
7912 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7913 		for (n = 0; n < eos; n++) {
7914 			if (re == NULL)
7915 				break;
7916 			s->first_displayed_entry = re;
7917 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7918 		}
7919 		if (n > 0)
7920 			s->selected = n - 1;
7921 		break;
7922 	}
7923 	case 'k':
7924 	case KEY_UP:
7925 	case CTRL('p'):
7926 		if (s->selected > 0) {
7927 			s->selected--;
7928 			break;
7929 		}
7930 		ref_scroll_up(s, 1);
7931 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7932 			view->count = 0;
7933 		break;
7934 	case CTRL('u'):
7935 	case 'u':
7936 		nscroll /= 2;
7937 		/* FALL THROUGH */
7938 	case KEY_PPAGE:
7939 	case CTRL('b'):
7940 	case 'b':
7941 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7942 			s->selected -= MIN(nscroll, s->selected);
7943 		ref_scroll_up(s, MAX(0, nscroll));
7944 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7945 			view->count = 0;
7946 		break;
7947 	case 'j':
7948 	case KEY_DOWN:
7949 	case CTRL('n'):
7950 		if (s->selected < s->ndisplayed - 1) {
7951 			s->selected++;
7952 			break;
7953 		}
7954 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7955 			/* can't scroll any further */
7956 			view->count = 0;
7957 			break;
7958 		}
7959 		ref_scroll_down(view, 1);
7960 		break;
7961 	case CTRL('d'):
7962 	case 'd':
7963 		nscroll /= 2;
7964 		/* FALL THROUGH */
7965 	case KEY_NPAGE:
7966 	case CTRL('f'):
7967 	case 'f':
7968 	case ' ':
7969 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7970 			/* can't scroll any further; move cursor down */
7971 			if (s->selected < s->ndisplayed - 1)
7972 				s->selected += MIN(nscroll,
7973 				    s->ndisplayed - s->selected - 1);
7974 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7975 				s->selected += s->ndisplayed - s->selected - 1;
7976 			view->count = 0;
7977 			break;
7978 		}
7979 		ref_scroll_down(view, nscroll);
7980 		break;
7981 	case CTRL('l'):
7982 		view->count = 0;
7983 		tog_free_refs();
7984 		err = tog_load_refs(s->repo, s->sort_by_date);
7985 		if (err)
7986 			break;
7987 		ref_view_free_refs(s);
7988 		err = ref_view_load_refs(s);
7989 		break;
7990 	case KEY_RESIZE:
7991 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7992 			s->selected = view->nlines - 2;
7993 		break;
7994 	default:
7995 		view->count = 0;
7996 		break;
7997 	}
7998 
7999 	return err;
8000 }
8001 
8002 __dead static void
8003 usage_ref(void)
8004 {
8005 	endwin();
8006 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8007 	    getprogname());
8008 	exit(1);
8009 }
8010 
8011 static const struct got_error *
8012 cmd_ref(int argc, char *argv[])
8013 {
8014 	const struct got_error *error;
8015 	struct got_repository *repo = NULL;
8016 	struct got_worktree *worktree = NULL;
8017 	char *cwd = NULL, *repo_path = NULL;
8018 	int ch;
8019 	struct tog_view *view;
8020 	int *pack_fds = NULL;
8021 
8022 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8023 		switch (ch) {
8024 		case 'r':
8025 			repo_path = realpath(optarg, NULL);
8026 			if (repo_path == NULL)
8027 				return got_error_from_errno2("realpath",
8028 				    optarg);
8029 			break;
8030 		default:
8031 			usage_ref();
8032 			/* NOTREACHED */
8033 		}
8034 	}
8035 
8036 	argc -= optind;
8037 	argv += optind;
8038 
8039 	if (argc > 1)
8040 		usage_ref();
8041 
8042 	error = got_repo_pack_fds_open(&pack_fds);
8043 	if (error != NULL)
8044 		goto done;
8045 
8046 	if (repo_path == NULL) {
8047 		cwd = getcwd(NULL, 0);
8048 		if (cwd == NULL)
8049 			return got_error_from_errno("getcwd");
8050 		error = got_worktree_open(&worktree, cwd);
8051 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8052 			goto done;
8053 		if (worktree)
8054 			repo_path =
8055 			    strdup(got_worktree_get_repo_path(worktree));
8056 		else
8057 			repo_path = strdup(cwd);
8058 		if (repo_path == NULL) {
8059 			error = got_error_from_errno("strdup");
8060 			goto done;
8061 		}
8062 	}
8063 
8064 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8065 	if (error != NULL)
8066 		goto done;
8067 
8068 	init_curses();
8069 
8070 	error = apply_unveil(got_repo_get_path(repo), NULL);
8071 	if (error)
8072 		goto done;
8073 
8074 	error = tog_load_refs(repo, 0);
8075 	if (error)
8076 		goto done;
8077 
8078 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8079 	if (view == NULL) {
8080 		error = got_error_from_errno("view_open");
8081 		goto done;
8082 	}
8083 
8084 	error = open_ref_view(view, repo);
8085 	if (error)
8086 		goto done;
8087 
8088 	if (worktree) {
8089 		/* Release work tree lock. */
8090 		got_worktree_close(worktree);
8091 		worktree = NULL;
8092 	}
8093 	error = view_loop(view);
8094 done:
8095 	free(repo_path);
8096 	free(cwd);
8097 	if (repo) {
8098 		const struct got_error *close_err = got_repo_close(repo);
8099 		if (close_err)
8100 			error = close_err;
8101 	}
8102 	if (pack_fds) {
8103 		const struct got_error *pack_err =
8104 		    got_repo_pack_fds_close(pack_fds);
8105 		if (error == NULL)
8106 			error = pack_err;
8107 	}
8108 	tog_free_refs();
8109 	return error;
8110 }
8111 
8112 static const struct got_error *
8113 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8114     enum tog_view_type request, int y, int x)
8115 {
8116 	const struct got_error *err = NULL;
8117 
8118 	*new_view = NULL;
8119 
8120 	switch (request) {
8121 	case TOG_VIEW_DIFF:
8122 		if (view->type == TOG_VIEW_LOG) {
8123 			struct tog_log_view_state *s = &view->state.log;
8124 
8125 			err = open_diff_view_for_commit(new_view, y, x,
8126 			    s->selected_entry->commit, s->selected_entry->id,
8127 			    view, s->repo);
8128 		} else
8129 			return got_error_msg(GOT_ERR_NOT_IMPL,
8130 			    "parent/child view pair not supported");
8131 		break;
8132 	case TOG_VIEW_BLAME:
8133 		if (view->type == TOG_VIEW_TREE) {
8134 			struct tog_tree_view_state *s = &view->state.tree;
8135 
8136 			err = blame_tree_entry(new_view, y, x,
8137 			    s->selected_entry, &s->parents, s->commit_id,
8138 			    s->repo);
8139 		} else
8140 			return got_error_msg(GOT_ERR_NOT_IMPL,
8141 			    "parent/child view pair not supported");
8142 		break;
8143 	case TOG_VIEW_LOG:
8144 		if (view->type == TOG_VIEW_BLAME)
8145 			err = log_annotated_line(new_view, y, x,
8146 			    view->state.blame.repo, view->state.blame.id_to_log);
8147 		else if (view->type == TOG_VIEW_TREE)
8148 			err = log_selected_tree_entry(new_view, y, x,
8149 			    &view->state.tree);
8150 		else if (view->type == TOG_VIEW_REF)
8151 			err = log_ref_entry(new_view, y, x,
8152 			    view->state.ref.selected_entry,
8153 			    view->state.ref.repo);
8154 		else
8155 			return got_error_msg(GOT_ERR_NOT_IMPL,
8156 			    "parent/child view pair not supported");
8157 		break;
8158 	case TOG_VIEW_TREE:
8159 		if (view->type == TOG_VIEW_LOG)
8160 			err = browse_commit_tree(new_view, y, x,
8161 			    view->state.log.selected_entry,
8162 			    view->state.log.in_repo_path,
8163 			    view->state.log.head_ref_name,
8164 			    view->state.log.repo);
8165 		else if (view->type == TOG_VIEW_REF)
8166 			err = browse_ref_tree(new_view, y, x,
8167 			    view->state.ref.selected_entry,
8168 			    view->state.ref.repo);
8169 		else
8170 			return got_error_msg(GOT_ERR_NOT_IMPL,
8171 			    "parent/child view pair not supported");
8172 		break;
8173 	case TOG_VIEW_REF:
8174 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8175 		if (*new_view == NULL)
8176 			return got_error_from_errno("view_open");
8177 		if (view->type == TOG_VIEW_LOG)
8178 			err = open_ref_view(*new_view, view->state.log.repo);
8179 		else if (view->type == TOG_VIEW_TREE)
8180 			err = open_ref_view(*new_view, view->state.tree.repo);
8181 		else
8182 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8183 			    "parent/child view pair not supported");
8184 		if (err)
8185 			view_close(*new_view);
8186 		break;
8187 	default:
8188 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8189 	}
8190 
8191 	return err;
8192 }
8193 
8194 /*
8195  * If view was scrolled down to move the selected line into view when opening a
8196  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8197  */
8198 static void
8199 offset_selection_up(struct tog_view *view)
8200 {
8201 	switch (view->type) {
8202 	case TOG_VIEW_BLAME: {
8203 		struct tog_blame_view_state *s = &view->state.blame;
8204 		if (s->first_displayed_line == 1) {
8205 			s->selected_line = MAX(s->selected_line - view->offset,
8206 			    1);
8207 			break;
8208 		}
8209 		if (s->first_displayed_line > view->offset)
8210 			s->first_displayed_line -= view->offset;
8211 		else
8212 			s->first_displayed_line = 1;
8213 		s->selected_line += view->offset;
8214 		break;
8215 	}
8216 	case TOG_VIEW_LOG:
8217 		log_scroll_up(&view->state.log, view->offset);
8218 		view->state.log.selected += view->offset;
8219 		break;
8220 	case TOG_VIEW_REF:
8221 		ref_scroll_up(&view->state.ref, view->offset);
8222 		view->state.ref.selected += view->offset;
8223 		break;
8224 	case TOG_VIEW_TREE:
8225 		tree_scroll_up(&view->state.tree, view->offset);
8226 		view->state.tree.selected += view->offset;
8227 		break;
8228 	default:
8229 		break;
8230 	}
8231 
8232 	view->offset = 0;
8233 }
8234 
8235 /*
8236  * If the selected line is in the section of screen covered by the bottom split,
8237  * scroll down offset lines to move it into view and index its new position.
8238  */
8239 static const struct got_error *
8240 offset_selection_down(struct tog_view *view)
8241 {
8242 	const struct got_error	*err = NULL;
8243 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8244 	int			*selected = NULL;
8245 	int			 header, offset;
8246 
8247 	switch (view->type) {
8248 	case TOG_VIEW_BLAME: {
8249 		struct tog_blame_view_state *s = &view->state.blame;
8250 		header = 3;
8251 		scrolld = NULL;
8252 		if (s->selected_line > view->nlines - header) {
8253 			offset = abs(view->nlines - s->selected_line - header);
8254 			s->first_displayed_line += offset;
8255 			s->selected_line -= offset;
8256 			view->offset = offset;
8257 		}
8258 		break;
8259 	}
8260 	case TOG_VIEW_LOG: {
8261 		struct tog_log_view_state *s = &view->state.log;
8262 		scrolld = &log_scroll_down;
8263 		header = view_is_parent_view(view) ? 3 : 2;
8264 		selected = &s->selected;
8265 		break;
8266 	}
8267 	case TOG_VIEW_REF: {
8268 		struct tog_ref_view_state *s = &view->state.ref;
8269 		scrolld = &ref_scroll_down;
8270 		header = 3;
8271 		selected = &s->selected;
8272 		break;
8273 	}
8274 	case TOG_VIEW_TREE: {
8275 		struct tog_tree_view_state *s = &view->state.tree;
8276 		scrolld = &tree_scroll_down;
8277 		header = 5;
8278 		selected = &s->selected;
8279 		break;
8280 	}
8281 	default:
8282 		selected = NULL;
8283 		scrolld = NULL;
8284 		header = 0;
8285 		break;
8286 	}
8287 
8288 	if (selected && *selected > view->nlines - header) {
8289 		offset = abs(view->nlines - *selected - header);
8290 		view->offset = offset;
8291 		if (scrolld && offset) {
8292 			err = scrolld(view, offset);
8293 			*selected -= offset;
8294 		}
8295 	}
8296 
8297 	return err;
8298 }
8299 
8300 static void
8301 list_commands(FILE *fp)
8302 {
8303 	size_t i;
8304 
8305 	fprintf(fp, "commands:");
8306 	for (i = 0; i < nitems(tog_commands); i++) {
8307 		const struct tog_cmd *cmd = &tog_commands[i];
8308 		fprintf(fp, " %s", cmd->name);
8309 	}
8310 	fputc('\n', fp);
8311 }
8312 
8313 __dead static void
8314 usage(int hflag, int status)
8315 {
8316 	FILE *fp = (status == 0) ? stdout : stderr;
8317 
8318 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8319 	    getprogname());
8320 	if (hflag) {
8321 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8322 		list_commands(fp);
8323 	}
8324 	exit(status);
8325 }
8326 
8327 static char **
8328 make_argv(int argc, ...)
8329 {
8330 	va_list ap;
8331 	char **argv;
8332 	int i;
8333 
8334 	va_start(ap, argc);
8335 
8336 	argv = calloc(argc, sizeof(char *));
8337 	if (argv == NULL)
8338 		err(1, "calloc");
8339 	for (i = 0; i < argc; i++) {
8340 		argv[i] = strdup(va_arg(ap, char *));
8341 		if (argv[i] == NULL)
8342 			err(1, "strdup");
8343 	}
8344 
8345 	va_end(ap);
8346 	return argv;
8347 }
8348 
8349 /*
8350  * Try to convert 'tog path' into a 'tog log path' command.
8351  * The user could simply have mistyped the command rather than knowingly
8352  * provided a path. So check whether argv[0] can in fact be resolved
8353  * to a path in the HEAD commit and print a special error if not.
8354  * This hack is for mpi@ <3
8355  */
8356 static const struct got_error *
8357 tog_log_with_path(int argc, char *argv[])
8358 {
8359 	const struct got_error *error = NULL, *close_err;
8360 	const struct tog_cmd *cmd = NULL;
8361 	struct got_repository *repo = NULL;
8362 	struct got_worktree *worktree = NULL;
8363 	struct got_object_id *commit_id = NULL, *id = NULL;
8364 	struct got_commit_object *commit = NULL;
8365 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8366 	char *commit_id_str = NULL, **cmd_argv = NULL;
8367 	int *pack_fds = NULL;
8368 
8369 	cwd = getcwd(NULL, 0);
8370 	if (cwd == NULL)
8371 		return got_error_from_errno("getcwd");
8372 
8373 	error = got_repo_pack_fds_open(&pack_fds);
8374 	if (error != NULL)
8375 		goto done;
8376 
8377 	error = got_worktree_open(&worktree, cwd);
8378 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8379 		goto done;
8380 
8381 	if (worktree)
8382 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8383 	else
8384 		repo_path = strdup(cwd);
8385 	if (repo_path == NULL) {
8386 		error = got_error_from_errno("strdup");
8387 		goto done;
8388 	}
8389 
8390 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8391 	if (error != NULL)
8392 		goto done;
8393 
8394 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8395 	    repo, worktree);
8396 	if (error)
8397 		goto done;
8398 
8399 	error = tog_load_refs(repo, 0);
8400 	if (error)
8401 		goto done;
8402 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8403 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8404 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8405 	if (error)
8406 		goto done;
8407 
8408 	if (worktree) {
8409 		got_worktree_close(worktree);
8410 		worktree = NULL;
8411 	}
8412 
8413 	error = got_object_open_as_commit(&commit, repo, commit_id);
8414 	if (error)
8415 		goto done;
8416 
8417 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8418 	if (error) {
8419 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8420 			goto done;
8421 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8422 		    getprogname(), argv[0]);
8423 		usage(1, 1);
8424 		/* not reached */
8425 	}
8426 
8427 	error = got_object_id_str(&commit_id_str, commit_id);
8428 	if (error)
8429 		goto done;
8430 
8431 	cmd = &tog_commands[0]; /* log */
8432 	argc = 4;
8433 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8434 	error = cmd->cmd_main(argc, cmd_argv);
8435 done:
8436 	if (repo) {
8437 		close_err = got_repo_close(repo);
8438 		if (error == NULL)
8439 			error = close_err;
8440 	}
8441 	if (commit)
8442 		got_object_commit_close(commit);
8443 	if (worktree)
8444 		got_worktree_close(worktree);
8445 	if (pack_fds) {
8446 		const struct got_error *pack_err =
8447 		    got_repo_pack_fds_close(pack_fds);
8448 		if (error == NULL)
8449 			error = pack_err;
8450 	}
8451 	free(id);
8452 	free(commit_id_str);
8453 	free(commit_id);
8454 	free(cwd);
8455 	free(repo_path);
8456 	free(in_repo_path);
8457 	if (cmd_argv) {
8458 		int i;
8459 		for (i = 0; i < argc; i++)
8460 			free(cmd_argv[i]);
8461 		free(cmd_argv);
8462 	}
8463 	tog_free_refs();
8464 	return error;
8465 }
8466 
8467 int
8468 main(int argc, char *argv[])
8469 {
8470 	const struct got_error *error = NULL;
8471 	const struct tog_cmd *cmd = NULL;
8472 	int ch, hflag = 0, Vflag = 0;
8473 	char **cmd_argv = NULL;
8474 	static const struct option longopts[] = {
8475 	    { "version", no_argument, NULL, 'V' },
8476 	    { NULL, 0, NULL, 0}
8477 	};
8478 	char *diff_algo_str = NULL;
8479 
8480 	setlocale(LC_CTYPE, "");
8481 
8482 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8483 		switch (ch) {
8484 		case 'h':
8485 			hflag = 1;
8486 			break;
8487 		case 'V':
8488 			Vflag = 1;
8489 			break;
8490 		default:
8491 			usage(hflag, 1);
8492 			/* NOTREACHED */
8493 		}
8494 	}
8495 
8496 	argc -= optind;
8497 	argv += optind;
8498 	optind = 1;
8499 	optreset = 1;
8500 
8501 	if (Vflag) {
8502 		got_version_print_str();
8503 		return 0;
8504 	}
8505 
8506 #ifndef PROFILE
8507 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8508 	    NULL) == -1)
8509 		err(1, "pledge");
8510 #endif
8511 
8512 	if (argc == 0) {
8513 		if (hflag)
8514 			usage(hflag, 0);
8515 		/* Build an argument vector which runs a default command. */
8516 		cmd = &tog_commands[0];
8517 		argc = 1;
8518 		cmd_argv = make_argv(argc, cmd->name);
8519 	} else {
8520 		size_t i;
8521 
8522 		/* Did the user specify a command? */
8523 		for (i = 0; i < nitems(tog_commands); i++) {
8524 			if (strncmp(tog_commands[i].name, argv[0],
8525 			    strlen(argv[0])) == 0) {
8526 				cmd = &tog_commands[i];
8527 				break;
8528 			}
8529 		}
8530 	}
8531 
8532 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8533 	if (diff_algo_str) {
8534 		if (strcasecmp(diff_algo_str, "patience") == 0)
8535 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8536 		if (strcasecmp(diff_algo_str, "myers") == 0)
8537 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8538 	}
8539 
8540 	if (cmd == NULL) {
8541 		if (argc != 1)
8542 			usage(0, 1);
8543 		/* No command specified; try log with a path */
8544 		error = tog_log_with_path(argc, argv);
8545 	} else {
8546 		if (hflag)
8547 			cmd->cmd_usage();
8548 		else
8549 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8550 	}
8551 
8552 	endwin();
8553 	putchar('\n');
8554 	if (cmd_argv) {
8555 		int i;
8556 		for (i = 0; i < argc; i++)
8557 			free(cmd_argv[i]);
8558 		free(cmd_argv);
8559 	}
8560 
8561 	if (error && error->code != GOT_ERR_CANCELLED)
8562 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8563 	return 0;
8564 }