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 
322 struct tog_diff_view_state {
323 	struct got_object_id *id1, *id2;
324 	const char *label1, *label2;
325 	FILE *f, *f1, *f2;
326 	int fd1, fd2;
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 tog_colors colors;
335 	size_t nlines;
336 	off_t *line_offsets;
337 	int matched_line;
338 	int selected_line;
339 
340 	/* passed from log or blame view; may be NULL */
341 	struct tog_view *parent_view;
342 };
343 
344 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
345 static volatile sig_atomic_t tog_thread_error;
346 
347 struct tog_log_thread_args {
348 	pthread_cond_t need_commits;
349 	pthread_cond_t commit_loaded;
350 	int commits_needed;
351 	int load_all;
352 	struct got_commit_graph *graph;
353 	struct commit_queue *commits;
354 	const char *in_repo_path;
355 	struct got_object_id *start_id;
356 	struct got_repository *repo;
357 	int *pack_fds;
358 	int log_complete;
359 	sig_atomic_t *quit;
360 	struct commit_queue_entry **first_displayed_entry;
361 	struct commit_queue_entry **selected_entry;
362 	int *searching;
363 	int *search_next_done;
364 	regex_t *regex;
365 };
366 
367 struct tog_log_view_state {
368 	struct commit_queue commits;
369 	struct commit_queue_entry *first_displayed_entry;
370 	struct commit_queue_entry *last_displayed_entry;
371 	struct commit_queue_entry *selected_entry;
372 	int selected;
373 	char *in_repo_path;
374 	char *head_ref_name;
375 	int log_branches;
376 	struct got_repository *repo;
377 	struct got_object_id *start_id;
378 	sig_atomic_t quit;
379 	pthread_t thread;
380 	struct tog_log_thread_args thread_args;
381 	struct commit_queue_entry *matched_entry;
382 	struct commit_queue_entry *search_entry;
383 	struct tog_colors colors;
384 	int use_committer;
385 };
386 
387 #define TOG_COLOR_DIFF_MINUS		1
388 #define TOG_COLOR_DIFF_PLUS		2
389 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
390 #define TOG_COLOR_DIFF_META		4
391 #define TOG_COLOR_TREE_SUBMODULE	5
392 #define TOG_COLOR_TREE_SYMLINK		6
393 #define TOG_COLOR_TREE_DIRECTORY	7
394 #define TOG_COLOR_TREE_EXECUTABLE	8
395 #define TOG_COLOR_COMMIT		9
396 #define TOG_COLOR_AUTHOR		10
397 #define TOG_COLOR_DATE			11
398 #define TOG_COLOR_REFS_HEADS		12
399 #define TOG_COLOR_REFS_TAGS		13
400 #define TOG_COLOR_REFS_REMOTES		14
401 #define TOG_COLOR_REFS_BACKUP		15
402 
403 struct tog_blame_cb_args {
404 	struct tog_blame_line *lines; /* one per line */
405 	int nlines;
406 
407 	struct tog_view *view;
408 	struct got_object_id *commit_id;
409 	int *quit;
410 };
411 
412 struct tog_blame_thread_args {
413 	const char *path;
414 	struct got_repository *repo;
415 	struct tog_blame_cb_args *cb_args;
416 	int *complete;
417 	got_cancel_cb cancel_cb;
418 	void *cancel_arg;
419 };
420 
421 struct tog_blame {
422 	FILE *f;
423 	off_t filesize;
424 	struct tog_blame_line *lines;
425 	int nlines;
426 	off_t *line_offsets;
427 	pthread_t thread;
428 	struct tog_blame_thread_args thread_args;
429 	struct tog_blame_cb_args cb_args;
430 	const char *path;
431 	int *pack_fds;
432 };
433 
434 struct tog_blame_view_state {
435 	int first_displayed_line;
436 	int last_displayed_line;
437 	int selected_line;
438 	int last_diffed_line;
439 	int blame_complete;
440 	int eof;
441 	int done;
442 	struct got_object_id_queue blamed_commits;
443 	struct got_object_qid *blamed_commit;
444 	char *path;
445 	struct got_repository *repo;
446 	struct got_object_id *commit_id;
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 ch, count; /* current keymap and count prefix */
526 	int resized; /* set when in a resize event */
527 	int focussed; /* Only set on one parent or child view at a time. */
528 	int dying;
529 	struct tog_view *parent;
530 	struct tog_view *child;
531 
532 	/*
533 	 * This flag is initially set on parent views when a new child view
534 	 * is created. It gets toggled when the 'Tab' key switches focus
535 	 * between parent and child.
536 	 * The flag indicates whether focus should be passed on to our child
537 	 * view if this parent view gets picked for focus after another parent
538 	 * view was closed. This prevents child views from losing focus in such
539 	 * situations.
540 	 */
541 	int focus_child;
542 
543 	enum tog_view_mode mode;
544 	/* type-specific state */
545 	enum tog_view_type type;
546 	union {
547 		struct tog_diff_view_state diff;
548 		struct tog_log_view_state log;
549 		struct tog_blame_view_state blame;
550 		struct tog_tree_view_state tree;
551 		struct tog_ref_view_state ref;
552 	} state;
553 
554 	const struct got_error *(*show)(struct tog_view *);
555 	const struct got_error *(*input)(struct tog_view **,
556 	    struct tog_view *, int);
557 	const struct got_error *(*reset)(struct tog_view *);
558 	const struct got_error *(*resize)(struct tog_view *, int);
559 	const struct got_error *(*close)(struct tog_view *);
560 
561 	const struct got_error *(*search_start)(struct tog_view *);
562 	const struct got_error *(*search_next)(struct tog_view *);
563 	int search_started;
564 	int searching;
565 #define TOG_SEARCH_FORWARD	1
566 #define TOG_SEARCH_BACKWARD	2
567 	int search_next_done;
568 #define TOG_SEARCH_HAVE_MORE	1
569 #define TOG_SEARCH_NO_MORE	2
570 #define TOG_SEARCH_HAVE_NONE	3
571 	regex_t regex;
572 	regmatch_t regmatch;
573 };
574 
575 static const struct got_error *open_diff_view(struct tog_view *,
576     struct got_object_id *, struct got_object_id *,
577     const char *, const char *, int, int, int, struct tog_view *,
578     struct got_repository *);
579 static const struct got_error *show_diff_view(struct tog_view *);
580 static const struct got_error *input_diff_view(struct tog_view **,
581     struct tog_view *, int);
582 static const struct got_error *reset_diff_view(struct tog_view *);
583 static const struct got_error* close_diff_view(struct tog_view *);
584 static const struct got_error *search_start_diff_view(struct tog_view *);
585 static const struct got_error *search_next_diff_view(struct tog_view *);
586 
587 static const struct got_error *open_log_view(struct tog_view *,
588     struct got_object_id *, struct got_repository *,
589     const char *, const char *, int);
590 static const struct got_error * show_log_view(struct tog_view *);
591 static const struct got_error *input_log_view(struct tog_view **,
592     struct tog_view *, int);
593 static const struct got_error *resize_log_view(struct tog_view *, int);
594 static const struct got_error *close_log_view(struct tog_view *);
595 static const struct got_error *search_start_log_view(struct tog_view *);
596 static const struct got_error *search_next_log_view(struct tog_view *);
597 
598 static const struct got_error *open_blame_view(struct tog_view *, char *,
599     struct got_object_id *, struct got_repository *);
600 static const struct got_error *show_blame_view(struct tog_view *);
601 static const struct got_error *input_blame_view(struct tog_view **,
602     struct tog_view *, int);
603 static const struct got_error *reset_blame_view(struct tog_view *);
604 static const struct got_error *close_blame_view(struct tog_view *);
605 static const struct got_error *search_start_blame_view(struct tog_view *);
606 static const struct got_error *search_next_blame_view(struct tog_view *);
607 
608 static const struct got_error *open_tree_view(struct tog_view *,
609     struct got_object_id *, const char *, struct got_repository *);
610 static const struct got_error *show_tree_view(struct tog_view *);
611 static const struct got_error *input_tree_view(struct tog_view **,
612     struct tog_view *, int);
613 static const struct got_error *close_tree_view(struct tog_view *);
614 static const struct got_error *search_start_tree_view(struct tog_view *);
615 static const struct got_error *search_next_tree_view(struct tog_view *);
616 
617 static const struct got_error *open_ref_view(struct tog_view *,
618     struct got_repository *);
619 static const struct got_error *show_ref_view(struct tog_view *);
620 static const struct got_error *input_ref_view(struct tog_view **,
621     struct tog_view *, int);
622 static const struct got_error *close_ref_view(struct tog_view *);
623 static const struct got_error *search_start_ref_view(struct tog_view *);
624 static const struct got_error *search_next_ref_view(struct tog_view *);
625 
626 static volatile sig_atomic_t tog_sigwinch_received;
627 static volatile sig_atomic_t tog_sigpipe_received;
628 static volatile sig_atomic_t tog_sigcont_received;
629 static volatile sig_atomic_t tog_sigint_received;
630 static volatile sig_atomic_t tog_sigterm_received;
631 
632 static void
633 tog_sigwinch(int signo)
634 {
635 	tog_sigwinch_received = 1;
636 }
637 
638 static void
639 tog_sigpipe(int signo)
640 {
641 	tog_sigpipe_received = 1;
642 }
643 
644 static void
645 tog_sigcont(int signo)
646 {
647 	tog_sigcont_received = 1;
648 }
649 
650 static void
651 tog_sigint(int signo)
652 {
653 	tog_sigint_received = 1;
654 }
655 
656 static void
657 tog_sigterm(int signo)
658 {
659 	tog_sigterm_received = 1;
660 }
661 
662 static int
663 tog_fatal_signal_received(void)
664 {
665 	return (tog_sigpipe_received ||
666 	    tog_sigint_received || tog_sigint_received);
667 }
668 
669 static const struct got_error *
670 view_close(struct tog_view *view)
671 {
672 	const struct got_error *err = NULL, *child_err = NULL;
673 
674 	if (view->child) {
675 		child_err = view_close(view->child);
676 		view->child = NULL;
677 	}
678 	if (view->close)
679 		err = view->close(view);
680 	if (view->panel)
681 		del_panel(view->panel);
682 	if (view->window)
683 		delwin(view->window);
684 	free(view);
685 	return err ? err : child_err;
686 }
687 
688 static struct tog_view *
689 view_open(int nlines, int ncols, int begin_y, int begin_x,
690     enum tog_view_type type)
691 {
692 	struct tog_view *view = calloc(1, sizeof(*view));
693 
694 	if (view == NULL)
695 		return NULL;
696 
697 	view->type = type;
698 	view->lines = LINES;
699 	view->cols = COLS;
700 	view->nlines = nlines ? nlines : LINES - begin_y;
701 	view->ncols = ncols ? ncols : COLS - begin_x;
702 	view->begin_y = begin_y;
703 	view->begin_x = begin_x;
704 	view->window = newwin(nlines, ncols, begin_y, begin_x);
705 	if (view->window == NULL) {
706 		view_close(view);
707 		return NULL;
708 	}
709 	view->panel = new_panel(view->window);
710 	if (view->panel == NULL ||
711 	    set_panel_userptr(view->panel, view) != OK) {
712 		view_close(view);
713 		return NULL;
714 	}
715 
716 	keypad(view->window, TRUE);
717 	return view;
718 }
719 
720 static int
721 view_split_begin_x(int begin_x)
722 {
723 	if (begin_x > 0 || COLS < 120)
724 		return 0;
725 	return (COLS - MAX(COLS / 2, 80));
726 }
727 
728 /* XXX Stub till we decide what to do. */
729 static int
730 view_split_begin_y(int lines)
731 {
732 	return lines * HSPLIT_SCALE;
733 }
734 
735 static const struct got_error *view_resize(struct tog_view *);
736 
737 static const struct got_error *
738 view_splitscreen(struct tog_view *view)
739 {
740 	const struct got_error *err = NULL;
741 
742 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
743 		if (view->resized_y && view->resized_y < view->lines)
744 			view->begin_y = view->resized_y;
745 		else
746 			view->begin_y = view_split_begin_y(view->nlines);
747 		view->begin_x = 0;
748 	} else if (!view->resized) {
749 		if (view->resized_x && view->resized_x < view->cols - 1 &&
750 		    view->cols > 119)
751 			view->begin_x = view->resized_x;
752 		else
753 			view->begin_x = view_split_begin_x(0);
754 		view->begin_y = 0;
755 	}
756 	view->nlines = LINES - view->begin_y;
757 	view->ncols = COLS - view->begin_x;
758 	view->lines = LINES;
759 	view->cols = COLS;
760 	err = view_resize(view);
761 	if (err)
762 		return err;
763 
764 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
765 		view->parent->nlines = view->begin_y;
766 
767 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
768 		return got_error_from_errno("mvwin");
769 
770 	return NULL;
771 }
772 
773 static const struct got_error *
774 view_fullscreen(struct tog_view *view)
775 {
776 	const struct got_error *err = NULL;
777 
778 	view->begin_x = 0;
779 	view->begin_y = view->resized ? view->begin_y : 0;
780 	view->nlines = view->resized ? view->nlines : LINES;
781 	view->ncols = COLS;
782 	view->lines = LINES;
783 	view->cols = COLS;
784 	err = view_resize(view);
785 	if (err)
786 		return err;
787 
788 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
789 		return got_error_from_errno("mvwin");
790 
791 	return NULL;
792 }
793 
794 static int
795 view_is_parent_view(struct tog_view *view)
796 {
797 	return view->parent == NULL;
798 }
799 
800 static int
801 view_is_splitscreen(struct tog_view *view)
802 {
803 	return view->begin_x > 0 || view->begin_y > 0;
804 }
805 
806 static int
807 view_is_fullscreen(struct tog_view *view)
808 {
809 	return view->nlines == LINES && view->ncols == COLS;
810 }
811 
812 static int
813 view_is_hsplit_top(struct tog_view *view)
814 {
815 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
816 	    view_is_splitscreen(view->child);
817 }
818 
819 static void
820 view_border(struct tog_view *view)
821 {
822 	PANEL *panel;
823 	const struct tog_view *view_above;
824 
825 	if (view->parent)
826 		return view_border(view->parent);
827 
828 	panel = panel_above(view->panel);
829 	if (panel == NULL)
830 		return;
831 
832 	view_above = panel_userptr(panel);
833 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
834 		mvwhline(view->window, view_above->begin_y - 1,
835 		    view->begin_x, got_locale_is_utf8() ?
836 		    ACS_HLINE : '-', view->ncols);
837 	else
838 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
839 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
840 }
841 
842 static const struct got_error *view_init_hsplit(struct tog_view *, int);
843 static const struct got_error *request_log_commits(struct tog_view *);
844 static const struct got_error *offset_selection_down(struct tog_view *);
845 static void offset_selection_up(struct tog_view *);
846 static void view_get_split(struct tog_view *, int *, int *);
847 
848 static const struct got_error *
849 view_resize(struct tog_view *view)
850 {
851 	const struct got_error	*err = NULL;
852 	int			 dif, nlines, ncols;
853 
854 	dif = LINES - view->lines;  /* line difference */
855 
856 	if (view->lines > LINES)
857 		nlines = view->nlines - (view->lines - LINES);
858 	else
859 		nlines = view->nlines + (LINES - view->lines);
860 	if (view->cols > COLS)
861 		ncols = view->ncols - (view->cols - COLS);
862 	else
863 		ncols = view->ncols + (COLS - view->cols);
864 
865 	if (view->child) {
866 		int hs = view->child->begin_y;
867 
868 		if (!view_is_fullscreen(view))
869 			view->child->begin_x = view_split_begin_x(view->begin_x);
870 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
871 		    view->child->begin_x == 0) {
872 			ncols = COLS;
873 
874 			view_fullscreen(view->child);
875 			if (view->child->focussed)
876 				show_panel(view->child->panel);
877 			else
878 				show_panel(view->panel);
879 		} else {
880 			ncols = view->child->begin_x;
881 
882 			view_splitscreen(view->child);
883 			show_panel(view->child->panel);
884 		}
885 		/*
886 		 * XXX This is ugly and needs to be moved into the above
887 		 * logic but "works" for now and my attempts at moving it
888 		 * break either 'tab' or 'F' key maps in horizontal splits.
889 		 */
890 		if (hs) {
891 			err = view_splitscreen(view->child);
892 			if (err)
893 				return err;
894 			if (dif < 0) { /* top split decreased */
895 				err = offset_selection_down(view);
896 				if (err)
897 					return err;
898 			}
899 			view_border(view);
900 			update_panels();
901 			doupdate();
902 			show_panel(view->child->panel);
903 			nlines = view->nlines;
904 		}
905 	} else if (view->parent == NULL)
906 		ncols = COLS;
907 
908 	if (view->resize && dif > 0) {
909 		err = view->resize(view, dif);
910 		if (err)
911 			return err;
912 	}
913 
914 	if (wresize(view->window, nlines, ncols) == ERR)
915 		return got_error_from_errno("wresize");
916 	if (replace_panel(view->panel, view->window) == ERR)
917 		return got_error_from_errno("replace_panel");
918 	wclear(view->window);
919 
920 	view->nlines = nlines;
921 	view->ncols = ncols;
922 	view->lines = LINES;
923 	view->cols = COLS;
924 
925 	return NULL;
926 }
927 
928 static const struct got_error *
929 resize_log_view(struct tog_view *view, int increase)
930 {
931 	struct tog_log_view_state *s = &view->state.log;
932 	const struct got_error *err = NULL;
933 	int n = s->selected_entry->idx + view->lines - s->selected;
934 
935 	/*
936 	 * Request commits to account for the increased
937 	 * height so we have enough to populate the view.
938 	 */
939 	if (s->commits.ncommits < n) {
940 		view->nscrolled = n - s->commits.ncommits + increase + 1;
941 		err = request_log_commits(view);
942 	}
943 
944 	return err;
945 }
946 
947 static void
948 view_adjust_offset(struct tog_view *view, int n)
949 {
950 	if (n == 0)
951 		return;
952 
953 	if (view->parent && view->parent->offset) {
954 		if (view->parent->offset + n >= 0)
955 			view->parent->offset += n;
956 		else
957 			view->parent->offset = 0;
958 	} else if (view->offset) {
959 		if (view->offset - n >= 0)
960 			view->offset -= n;
961 		else
962 			view->offset = 0;
963 	}
964 }
965 
966 static const struct got_error *
967 view_resize_split(struct tog_view *view, int resize)
968 {
969 	const struct got_error	*err = NULL;
970 	struct tog_view		*v = NULL;
971 
972 	if (view->parent)
973 		v = view->parent;
974 	else
975 		v = view;
976 
977 	if (!v->child || !view_is_splitscreen(v->child))
978 		return NULL;
979 
980 	v->resized = v->child->resized = resize;  /* lock for resize event */
981 
982 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
983 		int y = v->child->begin_y;
984 
985 		if (v->child->resized_y)
986 			v->child->begin_y = v->child->resized_y;
987 		if (view->parent)
988 			v->child->begin_y -= resize;
989 		else
990 			v->child->begin_y += resize;
991 		if (v->child->begin_y < 3) {
992 			view->count = 0;
993 			v->child->begin_y = 3;
994 		} else if (v->child->begin_y > LINES - 1) {
995 			view->count = 0;
996 			v->child->begin_y = LINES - 1;
997 		}
998 		v->ncols = COLS;
999 		v->child->ncols = COLS;
1000 		view_adjust_offset(view, resize);
1001 		err = view_init_hsplit(v, v->child->begin_y);
1002 		if (err)
1003 			return err;
1004 		v->child->resized_y = v->child->begin_y;
1005 		if (y > v->child->begin_y && v->child->type == TOG_VIEW_LOG)
1006 			v->child->nscrolled = y - v->child->begin_y;
1007 		else if (y < v->child->begin_y && v->type == TOG_VIEW_LOG)
1008 			v->nscrolled = v->child->begin_y - y;
1009 	} else {
1010 		if (v->child->resized_x)
1011 			v->child->begin_x = v->child->resized_x;
1012 		if (view->parent)
1013 			v->child->begin_x -= resize;
1014 		else
1015 			v->child->begin_x += resize;
1016 		if (v->child->begin_x < 11) {
1017 			view->count = 0;
1018 			v->child->begin_x = 11;
1019 		} else if (v->child->begin_x > COLS - 1) {
1020 			view->count = 0;
1021 			v->child->begin_x = COLS - 1;
1022 		}
1023 		v->child->resized_x = v->child->begin_x;
1024 	}
1025 
1026 	v->child->mode = v->mode;
1027 	v->child->nlines = v->lines - v->child->begin_y;
1028 	v->child->ncols = v->cols - v->child->begin_x;
1029 	v->focus_child = 1;
1030 
1031 	err = view_fullscreen(v);
1032 	if (err)
1033 		return err;
1034 	err = view_splitscreen(v->child);
1035 	if (err)
1036 		return err;
1037 
1038 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1039 		err = offset_selection_down(v->child);
1040 		if (err)
1041 			return err;
1042 	}
1043 
1044 	if (v->nscrolled)
1045 		err = request_log_commits(v);
1046 	else if (v->child->nscrolled)
1047 		err = request_log_commits(v->child);
1048 
1049 	v->resized = v->child->resized = 0;
1050 
1051 	return err;
1052 }
1053 
1054 static void
1055 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1056 {
1057 	struct tog_view *v = src->child ? src->child : src;
1058 
1059 	dst->resized_x = v->resized_x;
1060 	dst->resized_y = v->resized_y;
1061 }
1062 
1063 static const struct got_error *
1064 view_close_child(struct tog_view *view)
1065 {
1066 	const struct got_error *err = NULL;
1067 
1068 	if (view->child == NULL)
1069 		return NULL;
1070 
1071 	err = view_close(view->child);
1072 	view->child = NULL;
1073 	return err;
1074 }
1075 
1076 static const struct got_error *
1077 view_set_child(struct tog_view *view, struct tog_view *child)
1078 {
1079 	const struct got_error *err = NULL;
1080 
1081 	view->child = child;
1082 	child->parent = view;
1083 
1084 	err = view_resize(view);
1085 	if (err)
1086 		return err;
1087 
1088 	if (view->child->resized_x || view->child->resized_y)
1089 		err = view_resize_split(view, 0);
1090 
1091 	return err;
1092 }
1093 
1094 static void
1095 tog_resizeterm(void)
1096 {
1097 	int cols, lines;
1098 	struct winsize size;
1099 
1100 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1101 		cols = 80;     /* Default */
1102 		lines = 24;
1103 	} else {
1104 		cols = size.ws_col;
1105 		lines = size.ws_row;
1106 	}
1107 	resize_term(lines, cols);
1108 }
1109 
1110 static const struct got_error *
1111 view_search_start(struct tog_view *view)
1112 {
1113 	const struct got_error *err = NULL;
1114 	struct tog_view *v = view;
1115 	char pattern[1024];
1116 	int ret;
1117 
1118 	if (view->search_started) {
1119 		regfree(&view->regex);
1120 		view->searching = 0;
1121 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1122 	}
1123 	view->search_started = 0;
1124 
1125 	if (view->nlines < 1)
1126 		return NULL;
1127 
1128 	if (view_is_hsplit_top(view))
1129 		v = view->child;
1130 
1131 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1132 	wclrtoeol(v->window);
1133 
1134 	nodelay(view->window, FALSE);  /* block for search term input */
1135 	nocbreak();
1136 	echo();
1137 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1138 	wrefresh(v->window);
1139 	cbreak();
1140 	noecho();
1141 	nodelay(view->window, TRUE);
1142 	if (ret == ERR)
1143 		return NULL;
1144 
1145 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1146 		err = view->search_start(view);
1147 		if (err) {
1148 			regfree(&view->regex);
1149 			return err;
1150 		}
1151 		view->search_started = 1;
1152 		view->searching = TOG_SEARCH_FORWARD;
1153 		view->search_next_done = 0;
1154 		view->search_next(view);
1155 	}
1156 
1157 	return NULL;
1158 }
1159 
1160 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1161 static const struct got_error *
1162 switch_split(struct tog_view *view)
1163 {
1164 	const struct got_error	*err = NULL;
1165 	struct tog_view		*v = NULL;
1166 
1167 	if (view->parent)
1168 		v = view->parent;
1169 	else
1170 		v = view;
1171 
1172 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1173 		v->mode = TOG_VIEW_SPLIT_VERT;
1174 	else
1175 		v->mode = TOG_VIEW_SPLIT_HRZN;
1176 
1177 	if (!v->child)
1178 		return NULL;
1179 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1180 		v->mode = TOG_VIEW_SPLIT_NONE;
1181 
1182 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1183 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1184 		v->child->begin_y = v->child->resized_y;
1185 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1186 		v->child->begin_x = v->child->resized_x;
1187 
1188 
1189 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1190 		v->ncols = COLS;
1191 		v->child->ncols = COLS;
1192 		v->child->nscrolled = LINES - v->child->nlines;
1193 
1194 		err = view_init_hsplit(v, v->child->begin_y);
1195 		if (err)
1196 			return err;
1197 	}
1198 	v->child->mode = v->mode;
1199 	v->child->nlines = v->lines - v->child->begin_y;
1200 	v->focus_child = 1;
1201 
1202 	err = view_fullscreen(v);
1203 	if (err)
1204 		return err;
1205 	err = view_splitscreen(v->child);
1206 	if (err)
1207 		return err;
1208 
1209 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1210 		v->mode = TOG_VIEW_SPLIT_VERT;
1211 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1212 		err = offset_selection_down(v);
1213 		err = offset_selection_down(v->child);
1214 	} else {
1215 		offset_selection_up(v);
1216 		offset_selection_up(v->child);
1217 	}
1218 	if (v->type == TOG_VIEW_LOG && v->nscrolled)
1219 		err = request_log_commits(v);
1220 	else if (v->child->type == TOG_VIEW_LOG && v->child->nscrolled)
1221 		err = request_log_commits(v->child);
1222 
1223 	return err;
1224 }
1225 
1226 /*
1227  * Compute view->count from numeric input. Assign total to view->count and
1228  * return first non-numeric key entered.
1229  */
1230 static int
1231 get_compound_key(struct tog_view *view, int c)
1232 {
1233 	struct tog_view	*v = view;
1234 	int		 x, n = 0;
1235 
1236 	if (view_is_hsplit_top(view))
1237 		v = view->child;
1238 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1239 		v = view->parent;
1240 
1241 	view->count = 0;
1242 	cbreak();  /* block for input */
1243 	wmove(v->window, v->nlines - 1, 0);
1244 	wclrtoeol(v->window);
1245 	waddch(v->window, ':');
1246 
1247 	do {
1248 		x = getcurx(v->window);
1249 		if (x != ERR && x < view->ncols) {
1250 			waddch(v->window, c);
1251 			wrefresh(v->window);
1252 		}
1253 
1254 		/*
1255 		 * Don't overflow. Max valid request should be the greatest
1256 		 * between the longest and total lines; cap at 10 million.
1257 		 */
1258 		if (n >= 9999999)
1259 			n = 9999999;
1260 		else
1261 			n = n * 10 + (c - '0');
1262 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1263 
1264 	/* Massage excessive or inapplicable values at the input handler. */
1265 	view->count = n;
1266 
1267 	return c;
1268 }
1269 
1270 static const struct got_error *
1271 view_input(struct tog_view **new, int *done, struct tog_view *view,
1272     struct tog_view_list_head *views)
1273 {
1274 	const struct got_error *err = NULL;
1275 	struct tog_view *v;
1276 	int ch, errcode;
1277 
1278 	*new = NULL;
1279 
1280 	/* Clear "no matches" indicator. */
1281 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1282 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1283 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1284 		view->count = 0;
1285 	}
1286 
1287 	if (view->searching && !view->search_next_done) {
1288 		errcode = pthread_mutex_unlock(&tog_mutex);
1289 		if (errcode)
1290 			return got_error_set_errno(errcode,
1291 			    "pthread_mutex_unlock");
1292 		sched_yield();
1293 		errcode = pthread_mutex_lock(&tog_mutex);
1294 		if (errcode)
1295 			return got_error_set_errno(errcode,
1296 			    "pthread_mutex_lock");
1297 		view->search_next(view);
1298 		return NULL;
1299 	}
1300 
1301 	nodelay(view->window, FALSE);
1302 	/* Allow threads to make progress while we are waiting for input. */
1303 	errcode = pthread_mutex_unlock(&tog_mutex);
1304 	if (errcode)
1305 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1306 	/* If we have an unfinished count, let C-g or backspace abort. */
1307 	if (view->count && --view->count) {
1308 		cbreak();
1309 		nodelay(view->window, TRUE);
1310 		ch = wgetch(view->window);
1311 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1312 			view->count = 0;
1313 		else
1314 			ch = view->ch;
1315 	} else {
1316 		ch = wgetch(view->window);
1317 		if (ch >= '1' && ch  <= '9')
1318 			view->ch = ch = get_compound_key(view, ch);
1319 	}
1320 	errcode = pthread_mutex_lock(&tog_mutex);
1321 	if (errcode)
1322 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1323 	nodelay(view->window, TRUE);
1324 
1325 	if (tog_sigwinch_received || tog_sigcont_received) {
1326 		tog_resizeterm();
1327 		tog_sigwinch_received = 0;
1328 		tog_sigcont_received = 0;
1329 		TAILQ_FOREACH(v, views, entry) {
1330 			err = view_resize(v);
1331 			if (err)
1332 				return err;
1333 			err = v->input(new, v, KEY_RESIZE);
1334 			if (err)
1335 				return err;
1336 			if (v->child) {
1337 				err = view_resize(v->child);
1338 				if (err)
1339 					return err;
1340 				err = v->child->input(new, v->child,
1341 				    KEY_RESIZE);
1342 				if (err)
1343 					return err;
1344 				if (v->child->resized_x || v->child->resized_y) {
1345 					err = view_resize_split(v, 0);
1346 					if (err)
1347 						return err;
1348 				}
1349 			}
1350 		}
1351 	}
1352 
1353 	switch (ch) {
1354 	case '\t':
1355 		view->count = 0;
1356 		if (view->child) {
1357 			view->focussed = 0;
1358 			view->child->focussed = 1;
1359 			view->focus_child = 1;
1360 		} else if (view->parent) {
1361 			view->focussed = 0;
1362 			view->parent->focussed = 1;
1363 			view->parent->focus_child = 0;
1364 			if (!view_is_splitscreen(view)) {
1365 				if (view->mode == TOG_VIEW_SPLIT_HRZN &&
1366 				    view->parent->type == TOG_VIEW_LOG) {
1367 					err = request_log_commits(view->parent);
1368 					if (err)
1369 						return err;
1370 				}
1371 				offset_selection_up(view->parent);
1372 				err = view_fullscreen(view->parent);
1373 				if (err)
1374 					return err;
1375 			}
1376 		}
1377 		break;
1378 	case 'q':
1379 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1380 			if (view->parent->type == TOG_VIEW_LOG) {
1381 				/* might need more commits to fill fullscreen */
1382 				err = request_log_commits(view->parent);
1383 				if (err)
1384 					break;
1385 			}
1386 			offset_selection_up(view->parent);
1387 		}
1388 		err = view->input(new, view, ch);
1389 		view->dying = 1;
1390 		break;
1391 	case 'Q':
1392 		*done = 1;
1393 		break;
1394 	case 'F':
1395 		view->count = 0;
1396 		if (view_is_parent_view(view)) {
1397 			if (view->child == NULL)
1398 				break;
1399 			if (view_is_splitscreen(view->child)) {
1400 				view->focussed = 0;
1401 				view->child->focussed = 1;
1402 				err = view_fullscreen(view->child);
1403 			} else {
1404 				err = view_splitscreen(view->child);
1405 				if (!err)
1406 					err = view_resize_split(view, 0);
1407 			}
1408 			if (err)
1409 				break;
1410 			err = view->child->input(new, view->child,
1411 			    KEY_RESIZE);
1412 		} else {
1413 			if (view_is_splitscreen(view)) {
1414 				view->parent->focussed = 0;
1415 				view->focussed = 1;
1416 				err = view_fullscreen(view);
1417 			} else {
1418 				err = view_splitscreen(view);
1419 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1420 					err = view_resize(view->parent);
1421 				if (!err)
1422 					err = view_resize_split(view, 0);
1423 			}
1424 			if (err)
1425 				break;
1426 			err = view->input(new, view, KEY_RESIZE);
1427 		}
1428 		if (err)
1429 			break;
1430 		if (view->type == TOG_VIEW_LOG) {
1431 			err = request_log_commits(view);
1432 			if (err)
1433 				break;
1434 		}
1435 		if (view->parent)
1436 			err = offset_selection_down(view->parent);
1437 		if (!err)
1438 			err = offset_selection_down(view);
1439 		break;
1440 	case 'S':
1441 		view->count = 0;
1442 		err = switch_split(view);
1443 		break;
1444 	case '-':
1445 		err = view_resize_split(view, -1);
1446 		break;
1447 	case '+':
1448 		err = view_resize_split(view, 1);
1449 		break;
1450 	case KEY_RESIZE:
1451 		break;
1452 	case '/':
1453 		view->count = 0;
1454 		if (view->search_start)
1455 			view_search_start(view);
1456 		else
1457 			err = view->input(new, view, ch);
1458 		break;
1459 	case 'N':
1460 	case 'n':
1461 		if (view->search_started && view->search_next) {
1462 			view->searching = (ch == 'n' ?
1463 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1464 			view->search_next_done = 0;
1465 			view->search_next(view);
1466 		} else
1467 			err = view->input(new, view, ch);
1468 		break;
1469 	case 'A':
1470 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1471 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1472 		else
1473 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1474 		TAILQ_FOREACH(v, views, entry) {
1475 			if (v->reset) {
1476 				err = v->reset(v);
1477 				if (err)
1478 					return err;
1479 			}
1480 			if (v->child && v->child->reset) {
1481 				err = v->child->reset(v->child);
1482 				if (err)
1483 					return err;
1484 			}
1485 		}
1486 		break;
1487 	default:
1488 		err = view->input(new, view, ch);
1489 		break;
1490 	}
1491 
1492 	return err;
1493 }
1494 
1495 static int
1496 view_needs_focus_indication(struct tog_view *view)
1497 {
1498 	if (view_is_parent_view(view)) {
1499 		if (view->child == NULL || view->child->focussed)
1500 			return 0;
1501 		if (!view_is_splitscreen(view->child))
1502 			return 0;
1503 	} else if (!view_is_splitscreen(view))
1504 		return 0;
1505 
1506 	return view->focussed;
1507 }
1508 
1509 static const struct got_error *
1510 view_loop(struct tog_view *view)
1511 {
1512 	const struct got_error *err = NULL;
1513 	struct tog_view_list_head views;
1514 	struct tog_view *new_view;
1515 	char *mode;
1516 	int fast_refresh = 10;
1517 	int done = 0, errcode;
1518 
1519 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1520 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1521 		view->mode = TOG_VIEW_SPLIT_VERT;
1522 	else
1523 		view->mode = TOG_VIEW_SPLIT_HRZN;
1524 
1525 	errcode = pthread_mutex_lock(&tog_mutex);
1526 	if (errcode)
1527 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1528 
1529 	TAILQ_INIT(&views);
1530 	TAILQ_INSERT_HEAD(&views, view, entry);
1531 
1532 	view->focussed = 1;
1533 	err = view->show(view);
1534 	if (err)
1535 		return err;
1536 	update_panels();
1537 	doupdate();
1538 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1539 	    !tog_fatal_signal_received()) {
1540 		/* Refresh fast during initialization, then become slower. */
1541 		if (fast_refresh && fast_refresh-- == 0)
1542 			halfdelay(10); /* switch to once per second */
1543 
1544 		err = view_input(&new_view, &done, view, &views);
1545 		if (err)
1546 			break;
1547 		if (view->dying) {
1548 			struct tog_view *v, *prev = NULL;
1549 
1550 			if (view_is_parent_view(view))
1551 				prev = TAILQ_PREV(view, tog_view_list_head,
1552 				    entry);
1553 			else if (view->parent)
1554 				prev = view->parent;
1555 
1556 			if (view->parent) {
1557 				view->parent->child = NULL;
1558 				view->parent->focus_child = 0;
1559 				/* Restore fullscreen line height. */
1560 				view->parent->nlines = view->parent->lines;
1561 				err = view_resize(view->parent);
1562 				if (err)
1563 					break;
1564 				/* Make resized splits persist. */
1565 				view_transfer_size(view->parent, view);
1566 			} else
1567 				TAILQ_REMOVE(&views, view, entry);
1568 
1569 			err = view_close(view);
1570 			if (err)
1571 				goto done;
1572 
1573 			view = NULL;
1574 			TAILQ_FOREACH(v, &views, entry) {
1575 				if (v->focussed)
1576 					break;
1577 			}
1578 			if (view == NULL && new_view == NULL) {
1579 				/* No view has focus. Try to pick one. */
1580 				if (prev)
1581 					view = prev;
1582 				else if (!TAILQ_EMPTY(&views)) {
1583 					view = TAILQ_LAST(&views,
1584 					    tog_view_list_head);
1585 				}
1586 				if (view) {
1587 					if (view->focus_child) {
1588 						view->child->focussed = 1;
1589 						view = view->child;
1590 					} else
1591 						view->focussed = 1;
1592 				}
1593 			}
1594 		}
1595 		if (new_view) {
1596 			struct tog_view *v, *t;
1597 			/* Only allow one parent view per type. */
1598 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1599 				if (v->type != new_view->type)
1600 					continue;
1601 				TAILQ_REMOVE(&views, v, entry);
1602 				err = view_close(v);
1603 				if (err)
1604 					goto done;
1605 				break;
1606 			}
1607 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1608 			view = new_view;
1609 		}
1610 		if (view) {
1611 			if (view_is_parent_view(view)) {
1612 				if (view->child && view->child->focussed)
1613 					view = view->child;
1614 			} else {
1615 				if (view->parent && view->parent->focussed)
1616 					view = view->parent;
1617 			}
1618 			show_panel(view->panel);
1619 			if (view->child && view_is_splitscreen(view->child))
1620 				show_panel(view->child->panel);
1621 			if (view->parent && view_is_splitscreen(view)) {
1622 				err = view->parent->show(view->parent);
1623 				if (err)
1624 					goto done;
1625 			}
1626 			err = view->show(view);
1627 			if (err)
1628 				goto done;
1629 			if (view->child) {
1630 				err = view->child->show(view->child);
1631 				if (err)
1632 					goto done;
1633 			}
1634 			update_panels();
1635 			doupdate();
1636 		}
1637 	}
1638 done:
1639 	while (!TAILQ_EMPTY(&views)) {
1640 		const struct got_error *close_err;
1641 		view = TAILQ_FIRST(&views);
1642 		TAILQ_REMOVE(&views, view, entry);
1643 		close_err = view_close(view);
1644 		if (close_err && err == NULL)
1645 			err = close_err;
1646 	}
1647 
1648 	errcode = pthread_mutex_unlock(&tog_mutex);
1649 	if (errcode && err == NULL)
1650 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1651 
1652 	return err;
1653 }
1654 
1655 __dead static void
1656 usage_log(void)
1657 {
1658 	endwin();
1659 	fprintf(stderr,
1660 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1661 	    getprogname());
1662 	exit(1);
1663 }
1664 
1665 /* Create newly allocated wide-character string equivalent to a byte string. */
1666 static const struct got_error *
1667 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1668 {
1669 	char *vis = NULL;
1670 	const struct got_error *err = NULL;
1671 
1672 	*ws = NULL;
1673 	*wlen = mbstowcs(NULL, s, 0);
1674 	if (*wlen == (size_t)-1) {
1675 		int vislen;
1676 		if (errno != EILSEQ)
1677 			return got_error_from_errno("mbstowcs");
1678 
1679 		/* byte string invalid in current encoding; try to "fix" it */
1680 		err = got_mbsavis(&vis, &vislen, s);
1681 		if (err)
1682 			return err;
1683 		*wlen = mbstowcs(NULL, vis, 0);
1684 		if (*wlen == (size_t)-1) {
1685 			err = got_error_from_errno("mbstowcs"); /* give up */
1686 			goto done;
1687 		}
1688 	}
1689 
1690 	*ws = calloc(*wlen + 1, sizeof(**ws));
1691 	if (*ws == NULL) {
1692 		err = got_error_from_errno("calloc");
1693 		goto done;
1694 	}
1695 
1696 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1697 		err = got_error_from_errno("mbstowcs");
1698 done:
1699 	free(vis);
1700 	if (err) {
1701 		free(*ws);
1702 		*ws = NULL;
1703 		*wlen = 0;
1704 	}
1705 	return err;
1706 }
1707 
1708 static const struct got_error *
1709 expand_tab(char **ptr, const char *src)
1710 {
1711 	char	*dst;
1712 	size_t	 len, n, idx = 0, sz = 0;
1713 
1714 	*ptr = NULL;
1715 	n = len = strlen(src);
1716 	dst = malloc(n + 1);
1717 	if (dst == NULL)
1718 		return got_error_from_errno("malloc");
1719 
1720 	while (idx < len && src[idx]) {
1721 		const char c = src[idx];
1722 
1723 		if (c == '\t') {
1724 			size_t nb = TABSIZE - sz % TABSIZE;
1725 			char *p;
1726 
1727 			p = realloc(dst, n + nb);
1728 			if (p == NULL) {
1729 				free(dst);
1730 				return got_error_from_errno("realloc");
1731 
1732 			}
1733 			dst = p;
1734 			n += nb;
1735 			memset(dst + sz, ' ', nb);
1736 			sz += nb;
1737 		} else
1738 			dst[sz++] = src[idx];
1739 		++idx;
1740 	}
1741 
1742 	dst[sz] = '\0';
1743 	*ptr = dst;
1744 	return NULL;
1745 }
1746 
1747 /*
1748  * Advance at most n columns from wline starting at offset off.
1749  * Return the index to the first character after the span operation.
1750  * Return the combined column width of all spanned wide character in
1751  * *rcol.
1752  */
1753 static int
1754 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1755 {
1756 	int width, i, cols = 0;
1757 
1758 	if (n == 0) {
1759 		*rcol = cols;
1760 		return off;
1761 	}
1762 
1763 	for (i = off; wline[i] != L'\0'; ++i) {
1764 		if (wline[i] == L'\t')
1765 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1766 		else
1767 			width = wcwidth(wline[i]);
1768 
1769 		if (width == -1) {
1770 			width = 1;
1771 			wline[i] = L'.';
1772 		}
1773 
1774 		if (cols + width > n)
1775 			break;
1776 		cols += width;
1777 	}
1778 
1779 	*rcol = cols;
1780 	return i;
1781 }
1782 
1783 /*
1784  * Format a line for display, ensuring that it won't overflow a width limit.
1785  * With scrolling, the width returned refers to the scrolled version of the
1786  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1787  */
1788 static const struct got_error *
1789 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1790     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1791 {
1792 	const struct got_error *err = NULL;
1793 	int cols;
1794 	wchar_t *wline = NULL;
1795 	char *exstr = NULL;
1796 	size_t wlen;
1797 	int i, scrollx;
1798 
1799 	*wlinep = NULL;
1800 	*widthp = 0;
1801 
1802 	if (expand) {
1803 		err = expand_tab(&exstr, line);
1804 		if (err)
1805 			return err;
1806 	}
1807 
1808 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1809 	free(exstr);
1810 	if (err)
1811 		return err;
1812 
1813 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1814 
1815 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1816 		wline[wlen - 1] = L'\0';
1817 		wlen--;
1818 	}
1819 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1820 		wline[wlen - 1] = L'\0';
1821 		wlen--;
1822 	}
1823 
1824 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1825 	wline[i] = L'\0';
1826 
1827 	if (widthp)
1828 		*widthp = cols;
1829 	if (scrollxp)
1830 		*scrollxp = scrollx;
1831 	if (err)
1832 		free(wline);
1833 	else
1834 		*wlinep = wline;
1835 	return err;
1836 }
1837 
1838 static const struct got_error*
1839 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1840     struct got_object_id *id, struct got_repository *repo)
1841 {
1842 	static const struct got_error *err = NULL;
1843 	struct got_reflist_entry *re;
1844 	char *s;
1845 	const char *name;
1846 
1847 	*refs_str = NULL;
1848 
1849 	TAILQ_FOREACH(re, refs, entry) {
1850 		struct got_tag_object *tag = NULL;
1851 		struct got_object_id *ref_id;
1852 		int cmp;
1853 
1854 		name = got_ref_get_name(re->ref);
1855 		if (strcmp(name, GOT_REF_HEAD) == 0)
1856 			continue;
1857 		if (strncmp(name, "refs/", 5) == 0)
1858 			name += 5;
1859 		if (strncmp(name, "got/", 4) == 0 &&
1860 		    strncmp(name, "got/backup/", 11) != 0)
1861 			continue;
1862 		if (strncmp(name, "heads/", 6) == 0)
1863 			name += 6;
1864 		if (strncmp(name, "remotes/", 8) == 0) {
1865 			name += 8;
1866 			s = strstr(name, "/" GOT_REF_HEAD);
1867 			if (s != NULL && s[strlen(s)] == '\0')
1868 				continue;
1869 		}
1870 		err = got_ref_resolve(&ref_id, repo, re->ref);
1871 		if (err)
1872 			break;
1873 		if (strncmp(name, "tags/", 5) == 0) {
1874 			err = got_object_open_as_tag(&tag, repo, ref_id);
1875 			if (err) {
1876 				if (err->code != GOT_ERR_OBJ_TYPE) {
1877 					free(ref_id);
1878 					break;
1879 				}
1880 				/* Ref points at something other than a tag. */
1881 				err = NULL;
1882 				tag = NULL;
1883 			}
1884 		}
1885 		cmp = got_object_id_cmp(tag ?
1886 		    got_object_tag_get_object_id(tag) : ref_id, id);
1887 		free(ref_id);
1888 		if (tag)
1889 			got_object_tag_close(tag);
1890 		if (cmp != 0)
1891 			continue;
1892 		s = *refs_str;
1893 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1894 		    s ? ", " : "", name) == -1) {
1895 			err = got_error_from_errno("asprintf");
1896 			free(s);
1897 			*refs_str = NULL;
1898 			break;
1899 		}
1900 		free(s);
1901 	}
1902 
1903 	return err;
1904 }
1905 
1906 static const struct got_error *
1907 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1908     int col_tab_align)
1909 {
1910 	char *smallerthan;
1911 
1912 	smallerthan = strchr(author, '<');
1913 	if (smallerthan && smallerthan[1] != '\0')
1914 		author = smallerthan + 1;
1915 	author[strcspn(author, "@>")] = '\0';
1916 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1917 	    col_tab_align, 0);
1918 }
1919 
1920 static const struct got_error *
1921 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1922     struct got_object_id *id, const size_t date_display_cols,
1923     int author_display_cols)
1924 {
1925 	struct tog_log_view_state *s = &view->state.log;
1926 	const struct got_error *err = NULL;
1927 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1928 	char *logmsg0 = NULL, *logmsg = NULL;
1929 	char *author = NULL;
1930 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1931 	int author_width, logmsg_width;
1932 	char *newline, *line = NULL;
1933 	int col, limit, scrollx;
1934 	const int avail = view->ncols;
1935 	struct tm tm;
1936 	time_t committer_time;
1937 	struct tog_color *tc;
1938 
1939 	committer_time = got_object_commit_get_committer_time(commit);
1940 	if (gmtime_r(&committer_time, &tm) == NULL)
1941 		return got_error_from_errno("gmtime_r");
1942 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1943 		return got_error(GOT_ERR_NO_SPACE);
1944 
1945 	if (avail <= date_display_cols)
1946 		limit = MIN(sizeof(datebuf) - 1, avail);
1947 	else
1948 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1949 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1950 	if (tc)
1951 		wattr_on(view->window,
1952 		    COLOR_PAIR(tc->colorpair), NULL);
1953 	waddnstr(view->window, datebuf, limit);
1954 	if (tc)
1955 		wattr_off(view->window,
1956 		    COLOR_PAIR(tc->colorpair), NULL);
1957 	col = limit;
1958 	if (col > avail)
1959 		goto done;
1960 
1961 	if (avail >= 120) {
1962 		char *id_str;
1963 		err = got_object_id_str(&id_str, id);
1964 		if (err)
1965 			goto done;
1966 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1967 		if (tc)
1968 			wattr_on(view->window,
1969 			    COLOR_PAIR(tc->colorpair), NULL);
1970 		wprintw(view->window, "%.8s ", id_str);
1971 		if (tc)
1972 			wattr_off(view->window,
1973 			    COLOR_PAIR(tc->colorpair), NULL);
1974 		free(id_str);
1975 		col += 9;
1976 		if (col > avail)
1977 			goto done;
1978 	}
1979 
1980 	if (s->use_committer)
1981 		author = strdup(got_object_commit_get_committer(commit));
1982 	else
1983 		author = strdup(got_object_commit_get_author(commit));
1984 	if (author == NULL) {
1985 		err = got_error_from_errno("strdup");
1986 		goto done;
1987 	}
1988 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1989 	if (err)
1990 		goto done;
1991 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1992 	if (tc)
1993 		wattr_on(view->window,
1994 		    COLOR_PAIR(tc->colorpair), NULL);
1995 	waddwstr(view->window, wauthor);
1996 	if (tc)
1997 		wattr_off(view->window,
1998 		    COLOR_PAIR(tc->colorpair), NULL);
1999 	col += author_width;
2000 	while (col < avail && author_width < author_display_cols + 2) {
2001 		waddch(view->window, ' ');
2002 		col++;
2003 		author_width++;
2004 	}
2005 	if (col > avail)
2006 		goto done;
2007 
2008 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2009 	if (err)
2010 		goto done;
2011 	logmsg = logmsg0;
2012 	while (*logmsg == '\n')
2013 		logmsg++;
2014 	newline = strchr(logmsg, '\n');
2015 	if (newline)
2016 		*newline = '\0';
2017 	limit = avail - col;
2018 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2019 		limit--;	/* for the border */
2020 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2021 	    limit, col, 1);
2022 	if (err)
2023 		goto done;
2024 	waddwstr(view->window, &wlogmsg[scrollx]);
2025 	col += MAX(logmsg_width, 0);
2026 	while (col < avail) {
2027 		waddch(view->window, ' ');
2028 		col++;
2029 	}
2030 done:
2031 	free(logmsg0);
2032 	free(wlogmsg);
2033 	free(author);
2034 	free(wauthor);
2035 	free(line);
2036 	return err;
2037 }
2038 
2039 static struct commit_queue_entry *
2040 alloc_commit_queue_entry(struct got_commit_object *commit,
2041     struct got_object_id *id)
2042 {
2043 	struct commit_queue_entry *entry;
2044 
2045 	entry = calloc(1, sizeof(*entry));
2046 	if (entry == NULL)
2047 		return NULL;
2048 
2049 	entry->id = id;
2050 	entry->commit = commit;
2051 	return entry;
2052 }
2053 
2054 static void
2055 pop_commit(struct commit_queue *commits)
2056 {
2057 	struct commit_queue_entry *entry;
2058 
2059 	entry = TAILQ_FIRST(&commits->head);
2060 	TAILQ_REMOVE(&commits->head, entry, entry);
2061 	got_object_commit_close(entry->commit);
2062 	commits->ncommits--;
2063 	/* Don't free entry->id! It is owned by the commit graph. */
2064 	free(entry);
2065 }
2066 
2067 static void
2068 free_commits(struct commit_queue *commits)
2069 {
2070 	while (!TAILQ_EMPTY(&commits->head))
2071 		pop_commit(commits);
2072 }
2073 
2074 static const struct got_error *
2075 match_commit(int *have_match, struct got_object_id *id,
2076     struct got_commit_object *commit, regex_t *regex)
2077 {
2078 	const struct got_error *err = NULL;
2079 	regmatch_t regmatch;
2080 	char *id_str = NULL, *logmsg = NULL;
2081 
2082 	*have_match = 0;
2083 
2084 	err = got_object_id_str(&id_str, id);
2085 	if (err)
2086 		return err;
2087 
2088 	err = got_object_commit_get_logmsg(&logmsg, commit);
2089 	if (err)
2090 		goto done;
2091 
2092 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2093 	    &regmatch, 0) == 0 ||
2094 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2095 	    &regmatch, 0) == 0 ||
2096 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2097 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2098 		*have_match = 1;
2099 done:
2100 	free(id_str);
2101 	free(logmsg);
2102 	return err;
2103 }
2104 
2105 static const struct got_error *
2106 queue_commits(struct tog_log_thread_args *a)
2107 {
2108 	const struct got_error *err = NULL;
2109 
2110 	/*
2111 	 * We keep all commits open throughout the lifetime of the log
2112 	 * view in order to avoid having to re-fetch commits from disk
2113 	 * while updating the display.
2114 	 */
2115 	do {
2116 		struct got_object_id *id;
2117 		struct got_commit_object *commit;
2118 		struct commit_queue_entry *entry;
2119 		int errcode;
2120 
2121 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2122 		    NULL, NULL);
2123 		if (err || id == NULL)
2124 			break;
2125 
2126 		err = got_object_open_as_commit(&commit, a->repo, id);
2127 		if (err)
2128 			break;
2129 		entry = alloc_commit_queue_entry(commit, id);
2130 		if (entry == NULL) {
2131 			err = got_error_from_errno("alloc_commit_queue_entry");
2132 			break;
2133 		}
2134 
2135 		errcode = pthread_mutex_lock(&tog_mutex);
2136 		if (errcode) {
2137 			err = got_error_set_errno(errcode,
2138 			    "pthread_mutex_lock");
2139 			break;
2140 		}
2141 
2142 		entry->idx = a->commits->ncommits;
2143 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2144 		a->commits->ncommits++;
2145 
2146 		if (*a->searching == TOG_SEARCH_FORWARD &&
2147 		    !*a->search_next_done) {
2148 			int have_match;
2149 			err = match_commit(&have_match, id, commit, a->regex);
2150 			if (err)
2151 				break;
2152 			if (have_match)
2153 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2154 		}
2155 
2156 		errcode = pthread_mutex_unlock(&tog_mutex);
2157 		if (errcode && err == NULL)
2158 			err = got_error_set_errno(errcode,
2159 			    "pthread_mutex_unlock");
2160 		if (err)
2161 			break;
2162 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2163 
2164 	return err;
2165 }
2166 
2167 static void
2168 select_commit(struct tog_log_view_state *s)
2169 {
2170 	struct commit_queue_entry *entry;
2171 	int ncommits = 0;
2172 
2173 	entry = s->first_displayed_entry;
2174 	while (entry) {
2175 		if (ncommits == s->selected) {
2176 			s->selected_entry = entry;
2177 			break;
2178 		}
2179 		entry = TAILQ_NEXT(entry, entry);
2180 		ncommits++;
2181 	}
2182 }
2183 
2184 static const struct got_error *
2185 draw_commits(struct tog_view *view)
2186 {
2187 	const struct got_error *err = NULL;
2188 	struct tog_log_view_state *s = &view->state.log;
2189 	struct commit_queue_entry *entry = s->selected_entry;
2190 	const int limit = view->nlines;
2191 	int width;
2192 	int ncommits, author_cols = 4;
2193 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2194 	char *refs_str = NULL;
2195 	wchar_t *wline;
2196 	struct tog_color *tc;
2197 	static const size_t date_display_cols = 12;
2198 
2199 	if (s->selected_entry &&
2200 	    !(view->searching && view->search_next_done == 0)) {
2201 		struct got_reflist_head *refs;
2202 		err = got_object_id_str(&id_str, s->selected_entry->id);
2203 		if (err)
2204 			return err;
2205 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2206 		    s->selected_entry->id);
2207 		if (refs) {
2208 			err = build_refs_str(&refs_str, refs,
2209 			    s->selected_entry->id, s->repo);
2210 			if (err)
2211 				goto done;
2212 		}
2213 	}
2214 
2215 	if (s->thread_args.commits_needed == 0)
2216 		halfdelay(10); /* disable fast refresh */
2217 
2218 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2219 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2220 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2221 		    (view->searching && !view->search_next_done) ?
2222 		    "searching..." : "loading...") == -1) {
2223 			err = got_error_from_errno("asprintf");
2224 			goto done;
2225 		}
2226 	} else {
2227 		const char *search_str = NULL;
2228 
2229 		if (view->searching) {
2230 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2231 				search_str = "no more matches";
2232 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2233 				search_str = "no matches found";
2234 			else if (!view->search_next_done)
2235 				search_str = "searching...";
2236 		}
2237 
2238 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2239 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2240 		    search_str ? search_str :
2241 		    (refs_str ? refs_str : "")) == -1) {
2242 			err = got_error_from_errno("asprintf");
2243 			goto done;
2244 		}
2245 	}
2246 
2247 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2248 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2249 		    "........................................",
2250 		    s->in_repo_path, ncommits_str) == -1) {
2251 			err = got_error_from_errno("asprintf");
2252 			header = NULL;
2253 			goto done;
2254 		}
2255 	} else if (asprintf(&header, "commit %s%s",
2256 	    id_str ? id_str : "........................................",
2257 	    ncommits_str) == -1) {
2258 		err = got_error_from_errno("asprintf");
2259 		header = NULL;
2260 		goto done;
2261 	}
2262 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2263 	if (err)
2264 		goto done;
2265 
2266 	werase(view->window);
2267 
2268 	if (view_needs_focus_indication(view))
2269 		wstandout(view->window);
2270 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2271 	if (tc)
2272 		wattr_on(view->window,
2273 		    COLOR_PAIR(tc->colorpair), NULL);
2274 	waddwstr(view->window, wline);
2275 	if (tc)
2276 		wattr_off(view->window,
2277 		    COLOR_PAIR(tc->colorpair), NULL);
2278 	while (width < view->ncols) {
2279 		waddch(view->window, ' ');
2280 		width++;
2281 	}
2282 	if (view_needs_focus_indication(view))
2283 		wstandend(view->window);
2284 	free(wline);
2285 	if (limit <= 1)
2286 		goto done;
2287 
2288 	/* Grow author column size if necessary, and set view->maxx. */
2289 	entry = s->first_displayed_entry;
2290 	ncommits = 0;
2291 	view->maxx = 0;
2292 	while (entry) {
2293 		struct got_commit_object *c = entry->commit;
2294 		char *author, *eol, *msg, *msg0;
2295 		wchar_t *wauthor, *wmsg;
2296 		int width;
2297 		if (ncommits >= limit - 1)
2298 			break;
2299 		if (s->use_committer)
2300 			author = strdup(got_object_commit_get_committer(c));
2301 		else
2302 			author = strdup(got_object_commit_get_author(c));
2303 		if (author == NULL) {
2304 			err = got_error_from_errno("strdup");
2305 			goto done;
2306 		}
2307 		err = format_author(&wauthor, &width, author, COLS,
2308 		    date_display_cols);
2309 		if (author_cols < width)
2310 			author_cols = width;
2311 		free(wauthor);
2312 		free(author);
2313 		err = got_object_commit_get_logmsg(&msg0, c);
2314 		if (err)
2315 			goto done;
2316 		msg = msg0;
2317 		while (*msg == '\n')
2318 			++msg;
2319 		if ((eol = strchr(msg, '\n')))
2320 			*eol = '\0';
2321 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2322 		    date_display_cols + author_cols, 0);
2323 		if (err)
2324 			goto done;
2325 		view->maxx = MAX(view->maxx, width);
2326 		free(msg0);
2327 		free(wmsg);
2328 		ncommits++;
2329 		entry = TAILQ_NEXT(entry, entry);
2330 	}
2331 
2332 	entry = s->first_displayed_entry;
2333 	s->last_displayed_entry = s->first_displayed_entry;
2334 	ncommits = 0;
2335 	while (entry) {
2336 		if (ncommits >= limit - 1)
2337 			break;
2338 		if (ncommits == s->selected)
2339 			wstandout(view->window);
2340 		err = draw_commit(view, entry->commit, entry->id,
2341 		    date_display_cols, author_cols);
2342 		if (ncommits == s->selected)
2343 			wstandend(view->window);
2344 		if (err)
2345 			goto done;
2346 		ncommits++;
2347 		s->last_displayed_entry = entry;
2348 		entry = TAILQ_NEXT(entry, entry);
2349 	}
2350 
2351 	view_border(view);
2352 done:
2353 	free(id_str);
2354 	free(refs_str);
2355 	free(ncommits_str);
2356 	free(header);
2357 	return err;
2358 }
2359 
2360 static void
2361 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2362 {
2363 	struct commit_queue_entry *entry;
2364 	int nscrolled = 0;
2365 
2366 	entry = TAILQ_FIRST(&s->commits.head);
2367 	if (s->first_displayed_entry == entry)
2368 		return;
2369 
2370 	entry = s->first_displayed_entry;
2371 	while (entry && nscrolled < maxscroll) {
2372 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2373 		if (entry) {
2374 			s->first_displayed_entry = entry;
2375 			nscrolled++;
2376 		}
2377 	}
2378 }
2379 
2380 static const struct got_error *
2381 trigger_log_thread(struct tog_view *view, int wait)
2382 {
2383 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2384 	int errcode;
2385 
2386 	halfdelay(1); /* fast refresh while loading commits */
2387 
2388 	while (!ta->log_complete && !tog_thread_error &&
2389 	    (ta->commits_needed > 0 || ta->load_all)) {
2390 		/* Wake the log thread. */
2391 		errcode = pthread_cond_signal(&ta->need_commits);
2392 		if (errcode)
2393 			return got_error_set_errno(errcode,
2394 			    "pthread_cond_signal");
2395 
2396 		/*
2397 		 * The mutex will be released while the view loop waits
2398 		 * in wgetch(), at which time the log thread will run.
2399 		 */
2400 		if (!wait)
2401 			break;
2402 
2403 		/* Display progress update in log view. */
2404 		show_log_view(view);
2405 		update_panels();
2406 		doupdate();
2407 
2408 		/* Wait right here while next commit is being loaded. */
2409 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2410 		if (errcode)
2411 			return got_error_set_errno(errcode,
2412 			    "pthread_cond_wait");
2413 
2414 		/* Display progress update in log view. */
2415 		show_log_view(view);
2416 		update_panels();
2417 		doupdate();
2418 	}
2419 
2420 	return NULL;
2421 }
2422 
2423 static const struct got_error *
2424 request_log_commits(struct tog_view *view)
2425 {
2426 	struct tog_log_view_state	*state = &view->state.log;
2427 	const struct got_error		*err = NULL;
2428 
2429 	if (state->thread_args.log_complete)
2430 		return NULL;
2431 
2432 	state->thread_args.commits_needed += view->nscrolled;
2433 	err = trigger_log_thread(view, 1);
2434 	view->nscrolled = 0;
2435 
2436 	return err;
2437 }
2438 
2439 static const struct got_error *
2440 log_scroll_down(struct tog_view *view, int maxscroll)
2441 {
2442 	struct tog_log_view_state *s = &view->state.log;
2443 	const struct got_error *err = NULL;
2444 	struct commit_queue_entry *pentry;
2445 	int nscrolled = 0, ncommits_needed;
2446 
2447 	if (s->last_displayed_entry == NULL)
2448 		return NULL;
2449 
2450 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2451 	if (s->commits.ncommits < ncommits_needed &&
2452 	    !s->thread_args.log_complete) {
2453 		/*
2454 		 * Ask the log thread for required amount of commits.
2455 		 */
2456 		s->thread_args.commits_needed += maxscroll;
2457 		err = trigger_log_thread(view, 1);
2458 		if (err)
2459 			return err;
2460 	}
2461 
2462 	do {
2463 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2464 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2465 			break;
2466 
2467 		s->last_displayed_entry = pentry ?
2468 		    pentry : s->last_displayed_entry;;
2469 
2470 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2471 		if (pentry == NULL)
2472 			break;
2473 		s->first_displayed_entry = pentry;
2474 	} while (++nscrolled < maxscroll);
2475 
2476 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2477 		view->nscrolled += nscrolled;
2478 	else
2479 		view->nscrolled = 0;
2480 
2481 	return err;
2482 }
2483 
2484 static const struct got_error *
2485 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2486     struct got_commit_object *commit, struct got_object_id *commit_id,
2487     struct tog_view *log_view, struct got_repository *repo)
2488 {
2489 	const struct got_error *err;
2490 	struct got_object_qid *parent_id;
2491 	struct tog_view *diff_view;
2492 
2493 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2494 	if (diff_view == NULL)
2495 		return got_error_from_errno("view_open");
2496 
2497 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2498 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2499 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2500 	if (err == NULL)
2501 		*new_view = diff_view;
2502 	return err;
2503 }
2504 
2505 static const struct got_error *
2506 tree_view_visit_subtree(struct tog_tree_view_state *s,
2507     struct got_tree_object *subtree)
2508 {
2509 	struct tog_parent_tree *parent;
2510 
2511 	parent = calloc(1, sizeof(*parent));
2512 	if (parent == NULL)
2513 		return got_error_from_errno("calloc");
2514 
2515 	parent->tree = s->tree;
2516 	parent->first_displayed_entry = s->first_displayed_entry;
2517 	parent->selected_entry = s->selected_entry;
2518 	parent->selected = s->selected;
2519 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2520 	s->tree = subtree;
2521 	s->selected = 0;
2522 	s->first_displayed_entry = NULL;
2523 	return NULL;
2524 }
2525 
2526 static const struct got_error *
2527 tree_view_walk_path(struct tog_tree_view_state *s,
2528     struct got_commit_object *commit, const char *path)
2529 {
2530 	const struct got_error *err = NULL;
2531 	struct got_tree_object *tree = NULL;
2532 	const char *p;
2533 	char *slash, *subpath = NULL;
2534 
2535 	/* Walk the path and open corresponding tree objects. */
2536 	p = path;
2537 	while (*p) {
2538 		struct got_tree_entry *te;
2539 		struct got_object_id *tree_id;
2540 		char *te_name;
2541 
2542 		while (p[0] == '/')
2543 			p++;
2544 
2545 		/* Ensure the correct subtree entry is selected. */
2546 		slash = strchr(p, '/');
2547 		if (slash == NULL)
2548 			te_name = strdup(p);
2549 		else
2550 			te_name = strndup(p, slash - p);
2551 		if (te_name == NULL) {
2552 			err = got_error_from_errno("strndup");
2553 			break;
2554 		}
2555 		te = got_object_tree_find_entry(s->tree, te_name);
2556 		if (te == NULL) {
2557 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2558 			free(te_name);
2559 			break;
2560 		}
2561 		free(te_name);
2562 		s->first_displayed_entry = s->selected_entry = te;
2563 
2564 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2565 			break; /* jump to this file's entry */
2566 
2567 		slash = strchr(p, '/');
2568 		if (slash)
2569 			subpath = strndup(path, slash - path);
2570 		else
2571 			subpath = strdup(path);
2572 		if (subpath == NULL) {
2573 			err = got_error_from_errno("strdup");
2574 			break;
2575 		}
2576 
2577 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2578 		    subpath);
2579 		if (err)
2580 			break;
2581 
2582 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2583 		free(tree_id);
2584 		if (err)
2585 			break;
2586 
2587 		err = tree_view_visit_subtree(s, tree);
2588 		if (err) {
2589 			got_object_tree_close(tree);
2590 			break;
2591 		}
2592 		if (slash == NULL)
2593 			break;
2594 		free(subpath);
2595 		subpath = NULL;
2596 		p = slash;
2597 	}
2598 
2599 	free(subpath);
2600 	return err;
2601 }
2602 
2603 static const struct got_error *
2604 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2605     struct commit_queue_entry *entry, const char *path,
2606     const char *head_ref_name, struct got_repository *repo)
2607 {
2608 	const struct got_error *err = NULL;
2609 	struct tog_tree_view_state *s;
2610 	struct tog_view *tree_view;
2611 
2612 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2613 	if (tree_view == NULL)
2614 		return got_error_from_errno("view_open");
2615 
2616 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2617 	if (err)
2618 		return err;
2619 	s = &tree_view->state.tree;
2620 
2621 	*new_view = tree_view;
2622 
2623 	if (got_path_is_root_dir(path))
2624 		return NULL;
2625 
2626 	return tree_view_walk_path(s, entry->commit, path);
2627 }
2628 
2629 static const struct got_error *
2630 block_signals_used_by_main_thread(void)
2631 {
2632 	sigset_t sigset;
2633 	int errcode;
2634 
2635 	if (sigemptyset(&sigset) == -1)
2636 		return got_error_from_errno("sigemptyset");
2637 
2638 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2639 	if (sigaddset(&sigset, SIGWINCH) == -1)
2640 		return got_error_from_errno("sigaddset");
2641 	if (sigaddset(&sigset, SIGCONT) == -1)
2642 		return got_error_from_errno("sigaddset");
2643 	if (sigaddset(&sigset, SIGINT) == -1)
2644 		return got_error_from_errno("sigaddset");
2645 	if (sigaddset(&sigset, SIGTERM) == -1)
2646 		return got_error_from_errno("sigaddset");
2647 
2648 	/* ncurses handles SIGTSTP */
2649 	if (sigaddset(&sigset, SIGTSTP) == -1)
2650 		return got_error_from_errno("sigaddset");
2651 
2652 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2653 	if (errcode)
2654 		return got_error_set_errno(errcode, "pthread_sigmask");
2655 
2656 	return NULL;
2657 }
2658 
2659 static void *
2660 log_thread(void *arg)
2661 {
2662 	const struct got_error *err = NULL;
2663 	int errcode = 0;
2664 	struct tog_log_thread_args *a = arg;
2665 	int done = 0;
2666 
2667 	/*
2668 	 * Sync startup with main thread such that we begin our
2669 	 * work once view_input() has released the mutex.
2670 	 */
2671 	errcode = pthread_mutex_lock(&tog_mutex);
2672 	if (errcode) {
2673 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2674 		return (void *)err;
2675 	}
2676 
2677 	err = block_signals_used_by_main_thread();
2678 	if (err) {
2679 		pthread_mutex_unlock(&tog_mutex);
2680 		goto done;
2681 	}
2682 
2683 	while (!done && !err && !tog_fatal_signal_received()) {
2684 		errcode = pthread_mutex_unlock(&tog_mutex);
2685 		if (errcode) {
2686 			err = got_error_set_errno(errcode,
2687 			    "pthread_mutex_unlock");
2688 			goto done;
2689 		}
2690 		err = queue_commits(a);
2691 		if (err) {
2692 			if (err->code != GOT_ERR_ITER_COMPLETED)
2693 				goto done;
2694 			err = NULL;
2695 			done = 1;
2696 		} else if (a->commits_needed > 0 && !a->load_all)
2697 			a->commits_needed--;
2698 
2699 		errcode = pthread_mutex_lock(&tog_mutex);
2700 		if (errcode) {
2701 			err = got_error_set_errno(errcode,
2702 			    "pthread_mutex_lock");
2703 			goto done;
2704 		} else if (*a->quit)
2705 			done = 1;
2706 		else if (*a->first_displayed_entry == NULL) {
2707 			*a->first_displayed_entry =
2708 			    TAILQ_FIRST(&a->commits->head);
2709 			*a->selected_entry = *a->first_displayed_entry;
2710 		}
2711 
2712 		errcode = pthread_cond_signal(&a->commit_loaded);
2713 		if (errcode) {
2714 			err = got_error_set_errno(errcode,
2715 			    "pthread_cond_signal");
2716 			pthread_mutex_unlock(&tog_mutex);
2717 			goto done;
2718 		}
2719 
2720 		if (done)
2721 			a->commits_needed = 0;
2722 		else {
2723 			if (a->commits_needed == 0 && !a->load_all) {
2724 				errcode = pthread_cond_wait(&a->need_commits,
2725 				    &tog_mutex);
2726 				if (errcode) {
2727 					err = got_error_set_errno(errcode,
2728 					    "pthread_cond_wait");
2729 					pthread_mutex_unlock(&tog_mutex);
2730 					goto done;
2731 				}
2732 				if (*a->quit)
2733 					done = 1;
2734 			}
2735 		}
2736 	}
2737 	a->log_complete = 1;
2738 	errcode = pthread_mutex_unlock(&tog_mutex);
2739 	if (errcode)
2740 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2741 done:
2742 	if (err) {
2743 		tog_thread_error = 1;
2744 		pthread_cond_signal(&a->commit_loaded);
2745 	}
2746 	return (void *)err;
2747 }
2748 
2749 static const struct got_error *
2750 stop_log_thread(struct tog_log_view_state *s)
2751 {
2752 	const struct got_error *err = NULL, *thread_err = NULL;
2753 	int errcode;
2754 
2755 	if (s->thread) {
2756 		s->quit = 1;
2757 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2758 		if (errcode)
2759 			return got_error_set_errno(errcode,
2760 			    "pthread_cond_signal");
2761 		errcode = pthread_mutex_unlock(&tog_mutex);
2762 		if (errcode)
2763 			return got_error_set_errno(errcode,
2764 			    "pthread_mutex_unlock");
2765 		errcode = pthread_join(s->thread, (void **)&thread_err);
2766 		if (errcode)
2767 			return got_error_set_errno(errcode, "pthread_join");
2768 		errcode = pthread_mutex_lock(&tog_mutex);
2769 		if (errcode)
2770 			return got_error_set_errno(errcode,
2771 			    "pthread_mutex_lock");
2772 		s->thread = 0; //NULL;
2773 	}
2774 
2775 	if (s->thread_args.repo) {
2776 		err = got_repo_close(s->thread_args.repo);
2777 		s->thread_args.repo = NULL;
2778 	}
2779 
2780 	if (s->thread_args.pack_fds) {
2781 		const struct got_error *pack_err =
2782 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2783 		if (err == NULL)
2784 			err = pack_err;
2785 		s->thread_args.pack_fds = NULL;
2786 	}
2787 
2788 	if (s->thread_args.graph) {
2789 		got_commit_graph_close(s->thread_args.graph);
2790 		s->thread_args.graph = NULL;
2791 	}
2792 
2793 	return err ? err : thread_err;
2794 }
2795 
2796 static const struct got_error *
2797 close_log_view(struct tog_view *view)
2798 {
2799 	const struct got_error *err = NULL;
2800 	struct tog_log_view_state *s = &view->state.log;
2801 	int errcode;
2802 
2803 	err = stop_log_thread(s);
2804 
2805 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2806 	if (errcode && err == NULL)
2807 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2808 
2809 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2810 	if (errcode && err == NULL)
2811 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2812 
2813 	free_commits(&s->commits);
2814 	free(s->in_repo_path);
2815 	s->in_repo_path = NULL;
2816 	free(s->start_id);
2817 	s->start_id = NULL;
2818 	free(s->head_ref_name);
2819 	s->head_ref_name = NULL;
2820 	return err;
2821 }
2822 
2823 static const struct got_error *
2824 search_start_log_view(struct tog_view *view)
2825 {
2826 	struct tog_log_view_state *s = &view->state.log;
2827 
2828 	s->matched_entry = NULL;
2829 	s->search_entry = NULL;
2830 	return NULL;
2831 }
2832 
2833 static const struct got_error *
2834 search_next_log_view(struct tog_view *view)
2835 {
2836 	const struct got_error *err = NULL;
2837 	struct tog_log_view_state *s = &view->state.log;
2838 	struct commit_queue_entry *entry;
2839 
2840 	/* Display progress update in log view. */
2841 	show_log_view(view);
2842 	update_panels();
2843 	doupdate();
2844 
2845 	if (s->search_entry) {
2846 		int errcode, ch;
2847 		errcode = pthread_mutex_unlock(&tog_mutex);
2848 		if (errcode)
2849 			return got_error_set_errno(errcode,
2850 			    "pthread_mutex_unlock");
2851 		ch = wgetch(view->window);
2852 		errcode = pthread_mutex_lock(&tog_mutex);
2853 		if (errcode)
2854 			return got_error_set_errno(errcode,
2855 			    "pthread_mutex_lock");
2856 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2857 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2858 			return NULL;
2859 		}
2860 		if (view->searching == TOG_SEARCH_FORWARD)
2861 			entry = TAILQ_NEXT(s->search_entry, entry);
2862 		else
2863 			entry = TAILQ_PREV(s->search_entry,
2864 			    commit_queue_head, entry);
2865 	} else if (s->matched_entry) {
2866 		int matched_idx = s->matched_entry->idx;
2867 		int selected_idx = s->selected_entry->idx;
2868 
2869 		/*
2870 		 * If the user has moved the cursor after we hit a match,
2871 		 * the position from where we should continue searching
2872 		 * might have changed.
2873 		 */
2874 		if (view->searching == TOG_SEARCH_FORWARD) {
2875 			if (matched_idx > selected_idx)
2876 				entry = TAILQ_NEXT(s->selected_entry, entry);
2877 			else
2878 				entry = TAILQ_NEXT(s->matched_entry, entry);
2879 		} else {
2880 			if (matched_idx < selected_idx)
2881 				entry = TAILQ_PREV(s->selected_entry,
2882 						commit_queue_head, entry);
2883 			else
2884 				entry = TAILQ_PREV(s->matched_entry,
2885 						commit_queue_head, entry);
2886 		}
2887 	} else {
2888 		entry = s->selected_entry;
2889 	}
2890 
2891 	while (1) {
2892 		int have_match = 0;
2893 
2894 		if (entry == NULL) {
2895 			if (s->thread_args.log_complete ||
2896 			    view->searching == TOG_SEARCH_BACKWARD) {
2897 				view->search_next_done =
2898 				    (s->matched_entry == NULL ?
2899 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2900 				s->search_entry = NULL;
2901 				return NULL;
2902 			}
2903 			/*
2904 			 * Poke the log thread for more commits and return,
2905 			 * allowing the main loop to make progress. Search
2906 			 * will resume at s->search_entry once we come back.
2907 			 */
2908 			s->thread_args.commits_needed++;
2909 			return trigger_log_thread(view, 0);
2910 		}
2911 
2912 		err = match_commit(&have_match, entry->id, entry->commit,
2913 		    &view->regex);
2914 		if (err)
2915 			break;
2916 		if (have_match) {
2917 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2918 			s->matched_entry = entry;
2919 			break;
2920 		}
2921 
2922 		s->search_entry = entry;
2923 		if (view->searching == TOG_SEARCH_FORWARD)
2924 			entry = TAILQ_NEXT(entry, entry);
2925 		else
2926 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2927 	}
2928 
2929 	if (s->matched_entry) {
2930 		int cur = s->selected_entry->idx;
2931 		while (cur < s->matched_entry->idx) {
2932 			err = input_log_view(NULL, view, KEY_DOWN);
2933 			if (err)
2934 				return err;
2935 			cur++;
2936 		}
2937 		while (cur > s->matched_entry->idx) {
2938 			err = input_log_view(NULL, view, KEY_UP);
2939 			if (err)
2940 				return err;
2941 			cur--;
2942 		}
2943 	}
2944 
2945 	s->search_entry = NULL;
2946 
2947 	return NULL;
2948 }
2949 
2950 static const struct got_error *
2951 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2952     struct got_repository *repo, const char *head_ref_name,
2953     const char *in_repo_path, int log_branches)
2954 {
2955 	const struct got_error *err = NULL;
2956 	struct tog_log_view_state *s = &view->state.log;
2957 	struct got_repository *thread_repo = NULL;
2958 	struct got_commit_graph *thread_graph = NULL;
2959 	int errcode;
2960 
2961 	if (in_repo_path != s->in_repo_path) {
2962 		free(s->in_repo_path);
2963 		s->in_repo_path = strdup(in_repo_path);
2964 		if (s->in_repo_path == NULL)
2965 			return got_error_from_errno("strdup");
2966 	}
2967 
2968 	/* The commit queue only contains commits being displayed. */
2969 	TAILQ_INIT(&s->commits.head);
2970 	s->commits.ncommits = 0;
2971 
2972 	s->repo = repo;
2973 	if (head_ref_name) {
2974 		s->head_ref_name = strdup(head_ref_name);
2975 		if (s->head_ref_name == NULL) {
2976 			err = got_error_from_errno("strdup");
2977 			goto done;
2978 		}
2979 	}
2980 	s->start_id = got_object_id_dup(start_id);
2981 	if (s->start_id == NULL) {
2982 		err = got_error_from_errno("got_object_id_dup");
2983 		goto done;
2984 	}
2985 	s->log_branches = log_branches;
2986 
2987 	STAILQ_INIT(&s->colors);
2988 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2989 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2990 		    get_color_value("TOG_COLOR_COMMIT"));
2991 		if (err)
2992 			goto done;
2993 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2994 		    get_color_value("TOG_COLOR_AUTHOR"));
2995 		if (err) {
2996 			free_colors(&s->colors);
2997 			goto done;
2998 		}
2999 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3000 		    get_color_value("TOG_COLOR_DATE"));
3001 		if (err) {
3002 			free_colors(&s->colors);
3003 			goto done;
3004 		}
3005 	}
3006 
3007 	view->show = show_log_view;
3008 	view->input = input_log_view;
3009 	view->resize = resize_log_view;
3010 	view->close = close_log_view;
3011 	view->search_start = search_start_log_view;
3012 	view->search_next = search_next_log_view;
3013 
3014 	if (s->thread_args.pack_fds == NULL) {
3015 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3016 		if (err)
3017 			goto done;
3018 	}
3019 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3020 	    s->thread_args.pack_fds);
3021 	if (err)
3022 		goto done;
3023 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3024 	    !s->log_branches);
3025 	if (err)
3026 		goto done;
3027 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3028 	    s->repo, NULL, NULL);
3029 	if (err)
3030 		goto done;
3031 
3032 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3033 	if (errcode) {
3034 		err = got_error_set_errno(errcode, "pthread_cond_init");
3035 		goto done;
3036 	}
3037 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3038 	if (errcode) {
3039 		err = got_error_set_errno(errcode, "pthread_cond_init");
3040 		goto done;
3041 	}
3042 
3043 	s->thread_args.commits_needed = view->nlines;
3044 	s->thread_args.graph = thread_graph;
3045 	s->thread_args.commits = &s->commits;
3046 	s->thread_args.in_repo_path = s->in_repo_path;
3047 	s->thread_args.start_id = s->start_id;
3048 	s->thread_args.repo = thread_repo;
3049 	s->thread_args.log_complete = 0;
3050 	s->thread_args.quit = &s->quit;
3051 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3052 	s->thread_args.selected_entry = &s->selected_entry;
3053 	s->thread_args.searching = &view->searching;
3054 	s->thread_args.search_next_done = &view->search_next_done;
3055 	s->thread_args.regex = &view->regex;
3056 done:
3057 	if (err)
3058 		close_log_view(view);
3059 	return err;
3060 }
3061 
3062 static const struct got_error *
3063 show_log_view(struct tog_view *view)
3064 {
3065 	const struct got_error *err;
3066 	struct tog_log_view_state *s = &view->state.log;
3067 
3068 	if (s->thread == 0) { //NULL) {
3069 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3070 		    &s->thread_args);
3071 		if (errcode)
3072 			return got_error_set_errno(errcode, "pthread_create");
3073 		if (s->thread_args.commits_needed > 0) {
3074 			err = trigger_log_thread(view, 1);
3075 			if (err)
3076 				return err;
3077 		}
3078 	}
3079 
3080 	return draw_commits(view);
3081 }
3082 
3083 static void
3084 log_move_cursor_up(struct tog_view *view, int page, int home)
3085 {
3086 	struct tog_log_view_state *s = &view->state.log;
3087 
3088 	if (s->selected_entry->idx == 0)
3089 		view->count = 0;
3090 	if (s->first_displayed_entry == NULL)
3091 		return;
3092 
3093 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3094 	    || home)
3095 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3096 
3097 	if (!page && !home && s->selected > 0)
3098 		--s->selected;
3099 	else
3100 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3101 
3102 	select_commit(s);
3103 	return;
3104 }
3105 
3106 static const struct got_error *
3107 log_move_cursor_down(struct tog_view *view, int page)
3108 {
3109 	struct tog_log_view_state	*s = &view->state.log;
3110 	struct commit_queue_entry	*first;
3111 	const struct got_error		*err = NULL;
3112 
3113 	first = s->first_displayed_entry;
3114 	if (first == NULL) {
3115 		view->count = 0;
3116 		return NULL;
3117 	}
3118 
3119 	if (s->thread_args.log_complete &&
3120 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3121 		return NULL;
3122 
3123 	if (!page) {
3124 		int eos = view->nlines - 2;
3125 
3126 		if (view_is_hsplit_top(view))
3127 			--eos;  /* border consumes the last line */
3128 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3129 			++s->selected;
3130 		else
3131 			err = log_scroll_down(view, 1);
3132 	} else if (s->thread_args.load_all) {
3133 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3134 			s->selected += MIN(s->last_displayed_entry->idx -
3135 			    s->selected_entry->idx, page + 1);
3136 		else
3137 			err = log_scroll_down(view, MIN(page,
3138 			    s->commits.ncommits - s->selected_entry->idx - 1));
3139 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3140 	} else {
3141 		err = log_scroll_down(view, page);
3142 		if (err)
3143 			return err;
3144 		if (first == s->first_displayed_entry && s->selected <
3145 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3146 			s->selected = MIN(s->commits.ncommits - 1, page);
3147 		}
3148 	}
3149 	if (err)
3150 		return err;
3151 
3152 	/*
3153 	 * We might necessarily overshoot in horizontal
3154 	 * splits; if so, select the last displayed commit.
3155 	 */
3156 	s->selected = MIN(s->selected,
3157 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3158 
3159 	select_commit(s);
3160 
3161 	if (s->thread_args.log_complete &&
3162 	    s->selected_entry->idx == s->commits.ncommits - 1)
3163 		view->count = 0;
3164 
3165 	return NULL;
3166 }
3167 
3168 static void
3169 view_get_split(struct tog_view *view, int *y, int *x)
3170 {
3171 	*x = 0;
3172 	*y = 0;
3173 
3174 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3175 		if (view->child && view->child->resized_y)
3176 			*y = view->child->resized_y;
3177 		else if (view->resized_y)
3178 			*y = view->resized_y;
3179 		else
3180 			*y = view_split_begin_y(view->lines);
3181 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3182 		if (view->child && view->child->resized_x)
3183 			*x = view->child->resized_x;
3184 		else if (view->resized_x)
3185 			*x = view->resized_x;
3186 		else
3187 			*x = view_split_begin_x(view->begin_x);
3188 	}
3189 }
3190 
3191 /* Split view horizontally at y and offset view->state->selected line. */
3192 static const struct got_error *
3193 view_init_hsplit(struct tog_view *view, int y)
3194 {
3195 	const struct got_error *err = NULL;
3196 
3197 	view->nlines = y;
3198 	view->ncols = COLS;
3199 	err = view_resize(view);
3200 	if (err)
3201 		return err;
3202 
3203 	err = offset_selection_down(view);
3204 
3205 	return err;
3206 }
3207 
3208 static const struct got_error *
3209 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3210 {
3211 	const struct got_error *err = NULL;
3212 	struct tog_log_view_state *s = &view->state.log;
3213 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3214 	struct tog_view *ref_view = NULL;
3215 	struct commit_queue_entry *entry;
3216 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3217 
3218 	if (s->thread_args.load_all) {
3219 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3220 			s->thread_args.load_all = 0;
3221 		else if (s->thread_args.log_complete) {
3222 			err = log_move_cursor_down(view, s->commits.ncommits);
3223 			s->thread_args.load_all = 0;
3224 		}
3225 		return err;
3226 	}
3227 
3228 	eos = nscroll = view->nlines - 1;
3229 	if (view_is_hsplit_top(view))
3230 		--eos;  /* border */
3231 
3232 	switch (ch) {
3233 	case 'q':
3234 		s->quit = 1;
3235 		break;
3236 	case '0':
3237 		view->x = 0;
3238 		break;
3239 	case '$':
3240 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3241 		view->count = 0;
3242 		break;
3243 	case KEY_RIGHT:
3244 	case 'l':
3245 		if (view->x + view->ncols / 2 < view->maxx)
3246 			view->x += 2;  /* move two columns right */
3247 		else
3248 			view->count = 0;
3249 		break;
3250 	case KEY_LEFT:
3251 	case 'h':
3252 		view->x -= MIN(view->x, 2);  /* move two columns back */
3253 		if (view->x <= 0)
3254 			view->count = 0;
3255 		break;
3256 	case 'k':
3257 	case KEY_UP:
3258 	case '<':
3259 	case ',':
3260 	case CTRL('p'):
3261 		log_move_cursor_up(view, 0, 0);
3262 		break;
3263 	case 'g':
3264 	case KEY_HOME:
3265 		log_move_cursor_up(view, 0, 1);
3266 		view->count = 0;
3267 		break;
3268 	case CTRL('u'):
3269 	case 'u':
3270 		nscroll /= 2;
3271 		/* FALL THROUGH */
3272 	case KEY_PPAGE:
3273 	case CTRL('b'):
3274 	case 'b':
3275 		log_move_cursor_up(view, nscroll, 0);
3276 		break;
3277 	case 'j':
3278 	case KEY_DOWN:
3279 	case '>':
3280 	case '.':
3281 	case CTRL('n'):
3282 		err = log_move_cursor_down(view, 0);
3283 		break;
3284 	case '@':
3285 		s->use_committer = !s->use_committer;
3286 		break;
3287 	case 'G':
3288 	case KEY_END: {
3289 		/* We don't know yet how many commits, so we're forced to
3290 		 * traverse them all. */
3291 		view->count = 0;
3292 		if (!s->thread_args.log_complete) {
3293 			s->thread_args.load_all = 1;
3294 			return trigger_log_thread(view, 0);
3295 		}
3296 
3297 		s->selected = 0;
3298 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3299 		for (n = 0; n < eos; n++) {
3300 			if (entry == NULL)
3301 				break;
3302 			s->first_displayed_entry = entry;
3303 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3304 		}
3305 		if (n > 0)
3306 			s->selected = n - 1;
3307 		select_commit(s);
3308 		break;
3309 	}
3310 	case CTRL('d'):
3311 	case 'd':
3312 		nscroll /= 2;
3313 		/* FALL THROUGH */
3314 	case KEY_NPAGE:
3315 	case CTRL('f'):
3316 	case 'f':
3317 	case ' ':
3318 		err = log_move_cursor_down(view, nscroll);
3319 		break;
3320 	case KEY_RESIZE:
3321 		if (s->selected > view->nlines - 2)
3322 			s->selected = view->nlines - 2;
3323 		if (s->selected > s->commits.ncommits - 1)
3324 			s->selected = s->commits.ncommits - 1;
3325 		select_commit(s);
3326 		if (s->commits.ncommits < view->nlines - 1 &&
3327 		    !s->thread_args.log_complete) {
3328 			s->thread_args.commits_needed += (view->nlines - 1) -
3329 			    s->commits.ncommits;
3330 			err = trigger_log_thread(view, 1);
3331 		}
3332 		break;
3333 	case KEY_ENTER:
3334 	case '\r':
3335 		view->count = 0;
3336 		if (s->selected_entry == NULL)
3337 			break;
3338 
3339 		/* get dimensions--don't split till initialisation succeeds */
3340 		if (view_is_parent_view(view))
3341 			view_get_split(view, &begin_y, &begin_x);
3342 
3343 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3344 		    s->selected_entry->commit, s->selected_entry->id,
3345 		    view, s->repo);
3346 		if (err)
3347 			break;
3348 
3349 		if (view_is_parent_view(view) &&
3350 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3351 			err = view_init_hsplit(view, begin_y);
3352 			if (err)
3353 				break;
3354 		}
3355 
3356 		view->focussed = 0;
3357 		diff_view->focussed = 1;
3358 		diff_view->mode = view->mode;
3359 		diff_view->nlines = view->lines - begin_y;
3360 
3361 		if (view_is_parent_view(view)) {
3362 			view_transfer_size(diff_view, view);
3363 			err = view_close_child(view);
3364 			if (err)
3365 				return err;
3366 			err = view_set_child(view, diff_view);
3367 			if (err)
3368 				return err;
3369 			view->focus_child = 1;
3370 		} else
3371 			*new_view = diff_view;
3372 		break;
3373 	case 't':
3374 		view->count = 0;
3375 		if (s->selected_entry == NULL)
3376 			break;
3377 		if (view_is_parent_view(view))
3378 			view_get_split(view, &begin_y, &begin_x);
3379 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3380 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3381 		    s->repo);
3382 		if (err)
3383 			break;
3384 		if (view_is_parent_view(view) &&
3385 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3386 			err = view_init_hsplit(view, begin_y);
3387 			if (err)
3388 				break;
3389 		}
3390 		view->focussed = 0;
3391 		tree_view->focussed = 1;
3392 		tree_view->mode = view->mode;
3393 		tree_view->nlines = view->lines - begin_y;
3394 		if (view_is_parent_view(view)) {
3395 			view_transfer_size(tree_view, view);
3396 			err = view_close_child(view);
3397 			if (err)
3398 				return err;
3399 			err = view_set_child(view, tree_view);
3400 			if (err)
3401 				return err;
3402 			view->focus_child = 1;
3403 		} else
3404 			*new_view = tree_view;
3405 		break;
3406 	case KEY_BACKSPACE:
3407 	case CTRL('l'):
3408 	case 'B':
3409 		view->count = 0;
3410 		if (ch == KEY_BACKSPACE &&
3411 		    got_path_is_root_dir(s->in_repo_path))
3412 			break;
3413 		err = stop_log_thread(s);
3414 		if (err)
3415 			return err;
3416 		if (ch == KEY_BACKSPACE) {
3417 			char *parent_path;
3418 			err = got_path_dirname(&parent_path, s->in_repo_path);
3419 			if (err)
3420 				return err;
3421 			free(s->in_repo_path);
3422 			s->in_repo_path = parent_path;
3423 			s->thread_args.in_repo_path = s->in_repo_path;
3424 		} else if (ch == CTRL('l')) {
3425 			struct got_object_id *start_id;
3426 			err = got_repo_match_object_id(&start_id, NULL,
3427 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3428 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3429 			if (err)
3430 				return err;
3431 			free(s->start_id);
3432 			s->start_id = start_id;
3433 			s->thread_args.start_id = s->start_id;
3434 		} else /* 'B' */
3435 			s->log_branches = !s->log_branches;
3436 
3437 		if (s->thread_args.pack_fds == NULL) {
3438 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3439 			if (err)
3440 				return err;
3441 		}
3442 		err = got_repo_open(&s->thread_args.repo,
3443 		    got_repo_get_path(s->repo), NULL,
3444 		    s->thread_args.pack_fds);
3445 		if (err)
3446 			return err;
3447 		tog_free_refs();
3448 		err = tog_load_refs(s->repo, 0);
3449 		if (err)
3450 			return err;
3451 		err = got_commit_graph_open(&s->thread_args.graph,
3452 		    s->in_repo_path, !s->log_branches);
3453 		if (err)
3454 			return err;
3455 		err = got_commit_graph_iter_start(s->thread_args.graph,
3456 		    s->start_id, s->repo, NULL, NULL);
3457 		if (err)
3458 			return err;
3459 		free_commits(&s->commits);
3460 		s->first_displayed_entry = NULL;
3461 		s->last_displayed_entry = NULL;
3462 		s->selected_entry = NULL;
3463 		s->selected = 0;
3464 		s->thread_args.log_complete = 0;
3465 		s->quit = 0;
3466 		s->thread_args.commits_needed = view->lines;
3467 		s->matched_entry = NULL;
3468 		s->search_entry = NULL;
3469 		break;
3470 	case 'r':
3471 		view->count = 0;
3472 		if (view_is_parent_view(view))
3473 			view_get_split(view, &begin_y, &begin_x);
3474 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3475 		if (ref_view == NULL)
3476 			return got_error_from_errno("view_open");
3477 		err = open_ref_view(ref_view, s->repo);
3478 		if (err) {
3479 			view_close(ref_view);
3480 			return err;
3481 		}
3482 		if (view_is_parent_view(view) &&
3483 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3484 			err = view_init_hsplit(view, begin_y);
3485 			if (err)
3486 				break;
3487 		}
3488 		view->focussed = 0;
3489 		ref_view->focussed = 1;
3490 		ref_view->mode = view->mode;
3491 		ref_view->nlines = view->lines - begin_y;
3492 		if (view_is_parent_view(view)) {
3493 			view_transfer_size(ref_view, view);
3494 			err = view_close_child(view);
3495 			if (err)
3496 				return err;
3497 			err = view_set_child(view, ref_view);
3498 			if (err)
3499 				return err;
3500 			view->focus_child = 1;
3501 		} else
3502 			*new_view = ref_view;
3503 		break;
3504 	default:
3505 		view->count = 0;
3506 		break;
3507 	}
3508 
3509 	return err;
3510 }
3511 
3512 static const struct got_error *
3513 apply_unveil(const char *repo_path, const char *worktree_path)
3514 {
3515 	const struct got_error *error;
3516 
3517 #ifdef PROFILE
3518 	if (unveil("gmon.out", "rwc") != 0)
3519 		return got_error_from_errno2("unveil", "gmon.out");
3520 #endif
3521 	if (repo_path && unveil(repo_path, "r") != 0)
3522 		return got_error_from_errno2("unveil", repo_path);
3523 
3524 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3525 		return got_error_from_errno2("unveil", worktree_path);
3526 
3527 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3528 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3529 
3530 	error = got_privsep_unveil_exec_helpers();
3531 	if (error != NULL)
3532 		return error;
3533 
3534 	if (unveil(NULL, NULL) != 0)
3535 		return got_error_from_errno("unveil");
3536 
3537 	return NULL;
3538 }
3539 
3540 static void
3541 init_curses(void)
3542 {
3543 	/*
3544 	 * Override default signal handlers before starting ncurses.
3545 	 * This should prevent ncurses from installing its own
3546 	 * broken cleanup() signal handler.
3547 	 */
3548 	signal(SIGWINCH, tog_sigwinch);
3549 	signal(SIGPIPE, tog_sigpipe);
3550 	signal(SIGCONT, tog_sigcont);
3551 	signal(SIGINT, tog_sigint);
3552 	signal(SIGTERM, tog_sigterm);
3553 
3554 	initscr();
3555 	cbreak();
3556 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3557 	noecho();
3558 	nonl();
3559 	intrflush(stdscr, FALSE);
3560 	keypad(stdscr, TRUE);
3561 	curs_set(0);
3562 	if (getenv("TOG_COLORS") != NULL) {
3563 		start_color();
3564 		use_default_colors();
3565 	}
3566 }
3567 
3568 static const struct got_error *
3569 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3570     struct got_repository *repo, struct got_worktree *worktree)
3571 {
3572 	const struct got_error *err = NULL;
3573 
3574 	if (argc == 0) {
3575 		*in_repo_path = strdup("/");
3576 		if (*in_repo_path == NULL)
3577 			return got_error_from_errno("strdup");
3578 		return NULL;
3579 	}
3580 
3581 	if (worktree) {
3582 		const char *prefix = got_worktree_get_path_prefix(worktree);
3583 		char *p;
3584 
3585 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3586 		if (err)
3587 			return err;
3588 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3589 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3590 		    p) == -1) {
3591 			err = got_error_from_errno("asprintf");
3592 			*in_repo_path = NULL;
3593 		}
3594 		free(p);
3595 	} else
3596 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3597 
3598 	return err;
3599 }
3600 
3601 static const struct got_error *
3602 cmd_log(int argc, char *argv[])
3603 {
3604 	const struct got_error *error;
3605 	struct got_repository *repo = NULL;
3606 	struct got_worktree *worktree = NULL;
3607 	struct got_object_id *start_id = NULL;
3608 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3609 	char *start_commit = NULL, *label = NULL;
3610 	struct got_reference *ref = NULL;
3611 	const char *head_ref_name = NULL;
3612 	int ch, log_branches = 0;
3613 	struct tog_view *view;
3614 	int *pack_fds = NULL;
3615 
3616 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3617 		switch (ch) {
3618 		case 'b':
3619 			log_branches = 1;
3620 			break;
3621 		case 'c':
3622 			start_commit = optarg;
3623 			break;
3624 		case 'r':
3625 			repo_path = realpath(optarg, NULL);
3626 			if (repo_path == NULL)
3627 				return got_error_from_errno2("realpath",
3628 				    optarg);
3629 			break;
3630 		default:
3631 			usage_log();
3632 			/* NOTREACHED */
3633 		}
3634 	}
3635 
3636 	argc -= optind;
3637 	argv += optind;
3638 
3639 	if (argc > 1)
3640 		usage_log();
3641 
3642 	error = got_repo_pack_fds_open(&pack_fds);
3643 	if (error != NULL)
3644 		goto done;
3645 
3646 	if (repo_path == NULL) {
3647 		cwd = getcwd(NULL, 0);
3648 		if (cwd == NULL)
3649 			return got_error_from_errno("getcwd");
3650 		error = got_worktree_open(&worktree, cwd);
3651 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3652 			goto done;
3653 		if (worktree)
3654 			repo_path =
3655 			    strdup(got_worktree_get_repo_path(worktree));
3656 		else
3657 			repo_path = strdup(cwd);
3658 		if (repo_path == NULL) {
3659 			error = got_error_from_errno("strdup");
3660 			goto done;
3661 		}
3662 	}
3663 
3664 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3665 	if (error != NULL)
3666 		goto done;
3667 
3668 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3669 	    repo, worktree);
3670 	if (error)
3671 		goto done;
3672 
3673 	init_curses();
3674 
3675 	error = apply_unveil(got_repo_get_path(repo),
3676 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3677 	if (error)
3678 		goto done;
3679 
3680 	/* already loaded by tog_log_with_path()? */
3681 	if (TAILQ_EMPTY(&tog_refs)) {
3682 		error = tog_load_refs(repo, 0);
3683 		if (error)
3684 			goto done;
3685 	}
3686 
3687 	if (start_commit == NULL) {
3688 		error = got_repo_match_object_id(&start_id, &label,
3689 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3690 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3691 		if (error)
3692 			goto done;
3693 		head_ref_name = label;
3694 	} else {
3695 		error = got_ref_open(&ref, repo, start_commit, 0);
3696 		if (error == NULL)
3697 			head_ref_name = got_ref_get_name(ref);
3698 		else if (error->code != GOT_ERR_NOT_REF)
3699 			goto done;
3700 		error = got_repo_match_object_id(&start_id, NULL,
3701 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3702 		if (error)
3703 			goto done;
3704 	}
3705 
3706 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3707 	if (view == NULL) {
3708 		error = got_error_from_errno("view_open");
3709 		goto done;
3710 	}
3711 	error = open_log_view(view, start_id, repo, head_ref_name,
3712 	    in_repo_path, log_branches);
3713 	if (error)
3714 		goto done;
3715 	if (worktree) {
3716 		/* Release work tree lock. */
3717 		got_worktree_close(worktree);
3718 		worktree = NULL;
3719 	}
3720 	error = view_loop(view);
3721 done:
3722 	free(in_repo_path);
3723 	free(repo_path);
3724 	free(cwd);
3725 	free(start_id);
3726 	free(label);
3727 	if (ref)
3728 		got_ref_close(ref);
3729 	if (repo) {
3730 		const struct got_error *close_err = got_repo_close(repo);
3731 		if (error == NULL)
3732 			error = close_err;
3733 	}
3734 	if (worktree)
3735 		got_worktree_close(worktree);
3736 	if (pack_fds) {
3737 		const struct got_error *pack_err =
3738 		    got_repo_pack_fds_close(pack_fds);
3739 		if (error == NULL)
3740 			error = pack_err;
3741 	}
3742 	tog_free_refs();
3743 	return error;
3744 }
3745 
3746 __dead static void
3747 usage_diff(void)
3748 {
3749 	endwin();
3750 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3751 	    "[-w] object1 object2\n", getprogname());
3752 	exit(1);
3753 }
3754 
3755 static int
3756 match_line(const char *line, regex_t *regex, size_t nmatch,
3757     regmatch_t *regmatch)
3758 {
3759 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3760 }
3761 
3762 static struct tog_color *
3763 match_color(struct tog_colors *colors, const char *line)
3764 {
3765 	struct tog_color *tc = NULL;
3766 
3767 	STAILQ_FOREACH(tc, colors, entry) {
3768 		if (match_line(line, &tc->regex, 0, NULL))
3769 			return tc;
3770 	}
3771 
3772 	return NULL;
3773 }
3774 
3775 static const struct got_error *
3776 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3777     WINDOW *window, int skipcol, regmatch_t *regmatch)
3778 {
3779 	const struct got_error *err = NULL;
3780 	char *exstr = NULL;
3781 	wchar_t *wline = NULL;
3782 	int rme, rms, n, width, scrollx;
3783 	int width0 = 0, width1 = 0, width2 = 0;
3784 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3785 
3786 	*wtotal = 0;
3787 
3788 	rms = regmatch->rm_so;
3789 	rme = regmatch->rm_eo;
3790 
3791 	err = expand_tab(&exstr, line);
3792 	if (err)
3793 		return err;
3794 
3795 	/* Split the line into 3 segments, according to match offsets. */
3796 	seg0 = strndup(exstr, rms);
3797 	if (seg0 == NULL) {
3798 		err = got_error_from_errno("strndup");
3799 		goto done;
3800 	}
3801 	seg1 = strndup(exstr + rms, rme - rms);
3802 	if (seg1 == NULL) {
3803 		err = got_error_from_errno("strndup");
3804 		goto done;
3805 	}
3806 	seg2 = strdup(exstr + rme);
3807 	if (seg2 == NULL) {
3808 		err = got_error_from_errno("strndup");
3809 		goto done;
3810 	}
3811 
3812 	/* draw up to matched token if we haven't scrolled past it */
3813 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3814 	    col_tab_align, 1);
3815 	if (err)
3816 		goto done;
3817 	n = MAX(width0 - skipcol, 0);
3818 	if (n) {
3819 		free(wline);
3820 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3821 		    wlimit, col_tab_align, 1);
3822 		if (err)
3823 			goto done;
3824 		waddwstr(window, &wline[scrollx]);
3825 		wlimit -= width;
3826 		*wtotal += width;
3827 	}
3828 
3829 	if (wlimit > 0) {
3830 		int i = 0, w = 0;
3831 		size_t wlen;
3832 
3833 		free(wline);
3834 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3835 		    col_tab_align, 1);
3836 		if (err)
3837 			goto done;
3838 		wlen = wcslen(wline);
3839 		while (i < wlen) {
3840 			width = wcwidth(wline[i]);
3841 			if (width == -1) {
3842 				/* should not happen, tabs are expanded */
3843 				err = got_error(GOT_ERR_RANGE);
3844 				goto done;
3845 			}
3846 			if (width0 + w + width > skipcol)
3847 				break;
3848 			w += width;
3849 			i++;
3850 		}
3851 		/* draw (visible part of) matched token (if scrolled into it) */
3852 		if (width1 - w > 0) {
3853 			wattron(window, A_STANDOUT);
3854 			waddwstr(window, &wline[i]);
3855 			wattroff(window, A_STANDOUT);
3856 			wlimit -= (width1 - w);
3857 			*wtotal += (width1 - w);
3858 		}
3859 	}
3860 
3861 	if (wlimit > 0) {  /* draw rest of line */
3862 		free(wline);
3863 		if (skipcol > width0 + width1) {
3864 			err = format_line(&wline, &width2, &scrollx, seg2,
3865 			    skipcol - (width0 + width1), wlimit,
3866 			    col_tab_align, 1);
3867 			if (err)
3868 				goto done;
3869 			waddwstr(window, &wline[scrollx]);
3870 		} else {
3871 			err = format_line(&wline, &width2, NULL, seg2, 0,
3872 			    wlimit, col_tab_align, 1);
3873 			if (err)
3874 				goto done;
3875 			waddwstr(window, wline);
3876 		}
3877 		*wtotal += width2;
3878 	}
3879 done:
3880 	free(wline);
3881 	free(exstr);
3882 	free(seg0);
3883 	free(seg1);
3884 	free(seg2);
3885 	return err;
3886 }
3887 
3888 static const struct got_error *
3889 draw_file(struct tog_view *view, const char *header)
3890 {
3891 	struct tog_diff_view_state *s = &view->state.diff;
3892 	regmatch_t *regmatch = &view->regmatch;
3893 	const struct got_error *err;
3894 	int nprinted = 0;
3895 	char *line;
3896 	size_t linesize = 0;
3897 	ssize_t linelen;
3898 	struct tog_color *tc;
3899 	wchar_t *wline;
3900 	int width;
3901 	int max_lines = view->nlines;
3902 	int nlines = s->nlines;
3903 	off_t line_offset;
3904 
3905 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3906 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3907 		return got_error_from_errno("fseek");
3908 
3909 	werase(view->window);
3910 
3911 	if (header) {
3912 		if (asprintf(&line, "[%d/%d] %s",
3913 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3914 		    header) == -1)
3915 			return got_error_from_errno("asprintf");
3916 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3917 		    0, 0);
3918 		free(line);
3919 		if (err)
3920 			return err;
3921 
3922 		if (view_needs_focus_indication(view))
3923 			wstandout(view->window);
3924 		waddwstr(view->window, wline);
3925 		free(wline);
3926 		wline = NULL;
3927 		if (view_needs_focus_indication(view))
3928 			wstandend(view->window);
3929 		if (width <= view->ncols - 1)
3930 			waddch(view->window, '\n');
3931 
3932 		if (max_lines <= 1)
3933 			return NULL;
3934 		max_lines--;
3935 	}
3936 
3937 	s->eof = 0;
3938 	view->maxx = 0;
3939 	line = NULL;
3940 	while (max_lines > 0 && nprinted < max_lines) {
3941 		linelen = getline(&line, &linesize, s->f);
3942 		if (linelen == -1) {
3943 			if (feof(s->f)) {
3944 				s->eof = 1;
3945 				break;
3946 			}
3947 			free(line);
3948 			return got_ferror(s->f, GOT_ERR_IO);
3949 		}
3950 
3951 		/* Set view->maxx based on full line length. */
3952 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3953 		    view->x ? 1 : 0);
3954 		if (err) {
3955 			free(line);
3956 			return err;
3957 		}
3958 		view->maxx = MAX(view->maxx, width);
3959 		free(wline);
3960 		wline = NULL;
3961 
3962 		tc = match_color(&s->colors, line);
3963 		if (tc)
3964 			wattr_on(view->window,
3965 			    COLOR_PAIR(tc->colorpair), NULL);
3966 		if (s->first_displayed_line + nprinted == s->matched_line &&
3967 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3968 			err = add_matched_line(&width, line, view->ncols, 0,
3969 			    view->window, view->x, regmatch);
3970 			if (err) {
3971 				free(line);
3972 				return err;
3973 			}
3974 		} else {
3975 			int skip;
3976 			err = format_line(&wline, &width, &skip, line,
3977 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3978 			if (err) {
3979 				free(line);
3980 				return err;
3981 			}
3982 			waddwstr(view->window, &wline[skip]);
3983 			free(wline);
3984 			wline = NULL;
3985 		}
3986 		if (tc)
3987 			wattr_off(view->window,
3988 			    COLOR_PAIR(tc->colorpair), NULL);
3989 		if (width <= view->ncols - 1)
3990 			waddch(view->window, '\n');
3991 		nprinted++;
3992 	}
3993 	free(line);
3994 	if (nprinted >= 1)
3995 		s->last_displayed_line = s->first_displayed_line +
3996 		    (nprinted - 1);
3997 	else
3998 		s->last_displayed_line = s->first_displayed_line;
3999 
4000 	view_border(view);
4001 
4002 	if (s->eof) {
4003 		while (nprinted < view->nlines) {
4004 			waddch(view->window, '\n');
4005 			nprinted++;
4006 		}
4007 
4008 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4009 		    view->ncols, 0, 0);
4010 		if (err) {
4011 			return err;
4012 		}
4013 
4014 		wstandout(view->window);
4015 		waddwstr(view->window, wline);
4016 		free(wline);
4017 		wline = NULL;
4018 		wstandend(view->window);
4019 	}
4020 
4021 	return NULL;
4022 }
4023 
4024 static char *
4025 get_datestr(time_t *time, char *datebuf)
4026 {
4027 	struct tm mytm, *tm;
4028 	char *p, *s;
4029 
4030 	tm = gmtime_r(time, &mytm);
4031 	if (tm == NULL)
4032 		return NULL;
4033 	s = asctime_r(tm, datebuf);
4034 	if (s == NULL)
4035 		return NULL;
4036 	p = strchr(s, '\n');
4037 	if (p)
4038 		*p = '\0';
4039 	return s;
4040 }
4041 
4042 static const struct got_error *
4043 get_changed_paths(struct got_pathlist_head *paths,
4044     struct got_commit_object *commit, struct got_repository *repo)
4045 {
4046 	const struct got_error *err = NULL;
4047 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4048 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4049 	struct got_object_qid *qid;
4050 
4051 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4052 	if (qid != NULL) {
4053 		struct got_commit_object *pcommit;
4054 		err = got_object_open_as_commit(&pcommit, repo,
4055 		    &qid->id);
4056 		if (err)
4057 			return err;
4058 
4059 		tree_id1 = got_object_id_dup(
4060 		    got_object_commit_get_tree_id(pcommit));
4061 		if (tree_id1 == NULL) {
4062 			got_object_commit_close(pcommit);
4063 			return got_error_from_errno("got_object_id_dup");
4064 		}
4065 		got_object_commit_close(pcommit);
4066 
4067 	}
4068 
4069 	if (tree_id1) {
4070 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4071 		if (err)
4072 			goto done;
4073 	}
4074 
4075 	tree_id2 = got_object_commit_get_tree_id(commit);
4076 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4077 	if (err)
4078 		goto done;
4079 
4080 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4081 	    got_diff_tree_collect_changed_paths, paths, 0);
4082 done:
4083 	if (tree1)
4084 		got_object_tree_close(tree1);
4085 	if (tree2)
4086 		got_object_tree_close(tree2);
4087 	free(tree_id1);
4088 	return err;
4089 }
4090 
4091 static const struct got_error *
4092 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4093 {
4094 	off_t *p;
4095 
4096 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4097 	if (p == NULL)
4098 		return got_error_from_errno("reallocarray");
4099 	*line_offsets = p;
4100 	(*line_offsets)[*nlines] = off;
4101 	(*nlines)++;
4102 	return NULL;
4103 }
4104 
4105 static const struct got_error *
4106 write_commit_info(off_t **line_offsets, size_t *nlines,
4107     struct got_object_id *commit_id, struct got_reflist_head *refs,
4108     struct got_repository *repo, FILE *outfile)
4109 {
4110 	const struct got_error *err = NULL;
4111 	char datebuf[26], *datestr;
4112 	struct got_commit_object *commit;
4113 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4114 	time_t committer_time;
4115 	const char *author, *committer;
4116 	char *refs_str = NULL;
4117 	struct got_pathlist_head changed_paths;
4118 	struct got_pathlist_entry *pe;
4119 	off_t outoff = 0;
4120 	int n;
4121 
4122 	TAILQ_INIT(&changed_paths);
4123 
4124 	if (refs) {
4125 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4126 		if (err)
4127 			return err;
4128 	}
4129 
4130 	err = got_object_open_as_commit(&commit, repo, commit_id);
4131 	if (err)
4132 		return err;
4133 
4134 	err = got_object_id_str(&id_str, commit_id);
4135 	if (err) {
4136 		err = got_error_from_errno("got_object_id_str");
4137 		goto done;
4138 	}
4139 
4140 	err = add_line_offset(line_offsets, nlines, 0);
4141 	if (err)
4142 		goto done;
4143 
4144 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4145 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4146 	if (n < 0) {
4147 		err = got_error_from_errno("fprintf");
4148 		goto done;
4149 	}
4150 	outoff += n;
4151 	err = add_line_offset(line_offsets, nlines, outoff);
4152 	if (err)
4153 		goto done;
4154 
4155 	n = fprintf(outfile, "from: %s\n",
4156 	    got_object_commit_get_author(commit));
4157 	if (n < 0) {
4158 		err = got_error_from_errno("fprintf");
4159 		goto done;
4160 	}
4161 	outoff += n;
4162 	err = add_line_offset(line_offsets, nlines, outoff);
4163 	if (err)
4164 		goto done;
4165 
4166 	committer_time = got_object_commit_get_committer_time(commit);
4167 	datestr = get_datestr(&committer_time, datebuf);
4168 	if (datestr) {
4169 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4170 		if (n < 0) {
4171 			err = got_error_from_errno("fprintf");
4172 			goto done;
4173 		}
4174 		outoff += n;
4175 		err = add_line_offset(line_offsets, nlines, outoff);
4176 		if (err)
4177 			goto done;
4178 	}
4179 	author = got_object_commit_get_author(commit);
4180 	committer = got_object_commit_get_committer(commit);
4181 	if (strcmp(author, committer) != 0) {
4182 		n = fprintf(outfile, "via: %s\n", committer);
4183 		if (n < 0) {
4184 			err = got_error_from_errno("fprintf");
4185 			goto done;
4186 		}
4187 		outoff += n;
4188 		err = add_line_offset(line_offsets, nlines, outoff);
4189 		if (err)
4190 			goto done;
4191 	}
4192 	if (got_object_commit_get_nparents(commit) > 1) {
4193 		const struct got_object_id_queue *parent_ids;
4194 		struct got_object_qid *qid;
4195 		int pn = 1;
4196 		parent_ids = got_object_commit_get_parent_ids(commit);
4197 		STAILQ_FOREACH(qid, parent_ids, entry) {
4198 			err = got_object_id_str(&id_str, &qid->id);
4199 			if (err)
4200 				goto done;
4201 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4202 			if (n < 0) {
4203 				err = got_error_from_errno("fprintf");
4204 				goto done;
4205 			}
4206 			outoff += n;
4207 			err = add_line_offset(line_offsets, nlines, outoff);
4208 			if (err)
4209 				goto done;
4210 			free(id_str);
4211 			id_str = NULL;
4212 		}
4213 	}
4214 
4215 	err = got_object_commit_get_logmsg(&logmsg, commit);
4216 	if (err)
4217 		goto done;
4218 	s = logmsg;
4219 	while ((line = strsep(&s, "\n")) != NULL) {
4220 		n = fprintf(outfile, "%s\n", line);
4221 		if (n < 0) {
4222 			err = got_error_from_errno("fprintf");
4223 			goto done;
4224 		}
4225 		outoff += n;
4226 		err = add_line_offset(line_offsets, nlines, outoff);
4227 		if (err)
4228 			goto done;
4229 	}
4230 
4231 	err = get_changed_paths(&changed_paths, commit, repo);
4232 	if (err)
4233 		goto done;
4234 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4235 		struct got_diff_changed_path *cp = pe->data;
4236 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4237 		if (n < 0) {
4238 			err = got_error_from_errno("fprintf");
4239 			goto done;
4240 		}
4241 		outoff += n;
4242 		err = add_line_offset(line_offsets, nlines, outoff);
4243 		if (err)
4244 			goto done;
4245 		free((char *)pe->path);
4246 		free(pe->data);
4247 	}
4248 
4249 	fputc('\n', outfile);
4250 	outoff++;
4251 	err = add_line_offset(line_offsets, nlines, outoff);
4252 done:
4253 	got_pathlist_free(&changed_paths);
4254 	free(id_str);
4255 	free(logmsg);
4256 	free(refs_str);
4257 	got_object_commit_close(commit);
4258 	if (err) {
4259 		free(*line_offsets);
4260 		*line_offsets = NULL;
4261 		*nlines = 0;
4262 	}
4263 	return err;
4264 }
4265 
4266 static const struct got_error *
4267 create_diff(struct tog_diff_view_state *s)
4268 {
4269 	const struct got_error *err = NULL;
4270 	FILE *f = NULL;
4271 	int obj_type;
4272 
4273 	free(s->line_offsets);
4274 	s->line_offsets = malloc(sizeof(off_t));
4275 	if (s->line_offsets == NULL)
4276 		return got_error_from_errno("malloc");
4277 	s->nlines = 0;
4278 
4279 	f = got_opentemp();
4280 	if (f == NULL) {
4281 		err = got_error_from_errno("got_opentemp");
4282 		goto done;
4283 	}
4284 	if (s->f && fclose(s->f) == EOF) {
4285 		err = got_error_from_errno("fclose");
4286 		goto done;
4287 	}
4288 	s->f = f;
4289 
4290 	if (s->id1)
4291 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4292 	else
4293 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4294 	if (err)
4295 		goto done;
4296 
4297 	switch (obj_type) {
4298 	case GOT_OBJ_TYPE_BLOB:
4299 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4300 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4301 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4302 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4303 		break;
4304 	case GOT_OBJ_TYPE_TREE:
4305 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4306 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4307 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4308 		    s->force_text_diff, s->repo, s->f);
4309 		break;
4310 	case GOT_OBJ_TYPE_COMMIT: {
4311 		const struct got_object_id_queue *parent_ids;
4312 		struct got_object_qid *pid;
4313 		struct got_commit_object *commit2;
4314 		struct got_reflist_head *refs;
4315 
4316 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4317 		if (err)
4318 			goto done;
4319 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4320 		/* Show commit info if we're diffing to a parent/root commit. */
4321 		if (s->id1 == NULL) {
4322 			err = write_commit_info(&s->line_offsets, &s->nlines,
4323 			    s->id2, refs, s->repo, s->f);
4324 			if (err)
4325 				goto done;
4326 		} else {
4327 			parent_ids = got_object_commit_get_parent_ids(commit2);
4328 			STAILQ_FOREACH(pid, parent_ids, entry) {
4329 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4330 					err = write_commit_info(
4331 					    &s->line_offsets, &s->nlines,
4332 					    s->id2, refs, s->repo, s->f);
4333 					if (err)
4334 						goto done;
4335 					break;
4336 				}
4337 			}
4338 		}
4339 		got_object_commit_close(commit2);
4340 
4341 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4342 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4343 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4344 		    s->force_text_diff, s->repo, s->f);
4345 		break;
4346 	}
4347 	default:
4348 		err = got_error(GOT_ERR_OBJ_TYPE);
4349 		break;
4350 	}
4351 	if (err)
4352 		goto done;
4353 done:
4354 	if (s->f && fflush(s->f) != 0 && err == NULL)
4355 		err = got_error_from_errno("fflush");
4356 	return err;
4357 }
4358 
4359 static void
4360 diff_view_indicate_progress(struct tog_view *view)
4361 {
4362 	mvwaddstr(view->window, 0, 0, "diffing...");
4363 	update_panels();
4364 	doupdate();
4365 }
4366 
4367 static const struct got_error *
4368 search_start_diff_view(struct tog_view *view)
4369 {
4370 	struct tog_diff_view_state *s = &view->state.diff;
4371 
4372 	s->matched_line = 0;
4373 	return NULL;
4374 }
4375 
4376 static const struct got_error *
4377 search_next_diff_view(struct tog_view *view)
4378 {
4379 	struct tog_diff_view_state *s = &view->state.diff;
4380 	const struct got_error *err = NULL;
4381 	int lineno;
4382 	char *line = NULL;
4383 	size_t linesize = 0;
4384 	ssize_t linelen;
4385 
4386 	if (!view->searching) {
4387 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4388 		return NULL;
4389 	}
4390 
4391 	if (s->matched_line) {
4392 		if (view->searching == TOG_SEARCH_FORWARD)
4393 			lineno = s->matched_line + 1;
4394 		else
4395 			lineno = s->matched_line - 1;
4396 	} else
4397 		lineno = s->first_displayed_line;
4398 
4399 	while (1) {
4400 		off_t offset;
4401 
4402 		if (lineno <= 0 || lineno > s->nlines) {
4403 			if (s->matched_line == 0) {
4404 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4405 				break;
4406 			}
4407 
4408 			if (view->searching == TOG_SEARCH_FORWARD)
4409 				lineno = 1;
4410 			else
4411 				lineno = s->nlines;
4412 		}
4413 
4414 		offset = s->line_offsets[lineno - 1];
4415 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4416 			free(line);
4417 			return got_error_from_errno("fseeko");
4418 		}
4419 		linelen = getline(&line, &linesize, s->f);
4420 		if (linelen != -1) {
4421 			char *exstr;
4422 			err = expand_tab(&exstr, line);
4423 			if (err)
4424 				break;
4425 			if (match_line(exstr, &view->regex, 1,
4426 			    &view->regmatch)) {
4427 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4428 				s->matched_line = lineno;
4429 				free(exstr);
4430 				break;
4431 			}
4432 			free(exstr);
4433 		}
4434 		if (view->searching == TOG_SEARCH_FORWARD)
4435 			lineno++;
4436 		else
4437 			lineno--;
4438 	}
4439 	free(line);
4440 
4441 	if (s->matched_line) {
4442 		s->first_displayed_line = s->matched_line;
4443 		s->selected_line = 1;
4444 	}
4445 
4446 	return err;
4447 }
4448 
4449 static const struct got_error *
4450 close_diff_view(struct tog_view *view)
4451 {
4452 	const struct got_error *err = NULL;
4453 	struct tog_diff_view_state *s = &view->state.diff;
4454 
4455 	free(s->id1);
4456 	s->id1 = NULL;
4457 	free(s->id2);
4458 	s->id2 = NULL;
4459 	if (s->f && fclose(s->f) == EOF)
4460 		err = got_error_from_errno("fclose");
4461 	s->f = NULL;
4462 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4463 		err = got_error_from_errno("fclose");
4464 	s->f1 = NULL;
4465 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4466 		err = got_error_from_errno("fclose");
4467 	s->f2 = NULL;
4468 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4469 		err = got_error_from_errno("close");
4470 	s->fd1 = -1;
4471 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4472 		err = got_error_from_errno("close");
4473 	s->fd2 = -1;
4474 	free_colors(&s->colors);
4475 	free(s->line_offsets);
4476 	s->line_offsets = NULL;
4477 	s->nlines = 0;
4478 	return err;
4479 }
4480 
4481 static const struct got_error *
4482 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4483     struct got_object_id *id2, const char *label1, const char *label2,
4484     int diff_context, int ignore_whitespace, int force_text_diff,
4485     struct tog_view *parent_view, struct got_repository *repo)
4486 {
4487 	const struct got_error *err;
4488 	struct tog_diff_view_state *s = &view->state.diff;
4489 
4490 	memset(s, 0, sizeof(*s));
4491 	s->fd1 = -1;
4492 	s->fd2 = -1;
4493 
4494 	if (id1 != NULL && id2 != NULL) {
4495 	    int type1, type2;
4496 	    err = got_object_get_type(&type1, repo, id1);
4497 	    if (err)
4498 		return err;
4499 	    err = got_object_get_type(&type2, repo, id2);
4500 	    if (err)
4501 		return err;
4502 
4503 	    if (type1 != type2)
4504 		return got_error(GOT_ERR_OBJ_TYPE);
4505 	}
4506 	s->first_displayed_line = 1;
4507 	s->last_displayed_line = view->nlines;
4508 	s->selected_line = 1;
4509 	s->repo = repo;
4510 	s->id1 = id1;
4511 	s->id2 = id2;
4512 	s->label1 = label1;
4513 	s->label2 = label2;
4514 
4515 	if (id1) {
4516 		s->id1 = got_object_id_dup(id1);
4517 		if (s->id1 == NULL)
4518 			return got_error_from_errno("got_object_id_dup");
4519 	} else
4520 		s->id1 = NULL;
4521 
4522 	s->id2 = got_object_id_dup(id2);
4523 	if (s->id2 == NULL) {
4524 		err = got_error_from_errno("got_object_id_dup");
4525 		goto done;
4526 	}
4527 
4528 	s->f1 = got_opentemp();
4529 	if (s->f1 == NULL) {
4530 		err = got_error_from_errno("got_opentemp");
4531 		goto done;
4532 	}
4533 
4534 	s->f2 = got_opentemp();
4535 	if (s->f2 == NULL) {
4536 		err = got_error_from_errno("got_opentemp");
4537 		goto done;
4538 	}
4539 
4540 	s->fd1 = got_opentempfd();
4541 	if (s->fd1 == -1) {
4542 		err = got_error_from_errno("got_opentempfd");
4543 		goto done;
4544 	}
4545 
4546 	s->fd2 = got_opentempfd();
4547 	if (s->fd2 == -1) {
4548 		err = got_error_from_errno("got_opentempfd");
4549 		goto done;
4550 	}
4551 
4552 	s->first_displayed_line = 1;
4553 	s->last_displayed_line = view->nlines;
4554 	s->diff_context = diff_context;
4555 	s->ignore_whitespace = ignore_whitespace;
4556 	s->force_text_diff = force_text_diff;
4557 	s->parent_view = parent_view;
4558 	s->repo = repo;
4559 
4560 	STAILQ_INIT(&s->colors);
4561 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4562 		err = add_color(&s->colors,
4563 		    "^-", TOG_COLOR_DIFF_MINUS,
4564 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4565 		if (err)
4566 			goto done;
4567 		err = add_color(&s->colors, "^\\+",
4568 		    TOG_COLOR_DIFF_PLUS,
4569 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4570 		if (err)
4571 			goto done;
4572 		err = add_color(&s->colors,
4573 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4574 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4575 		if (err)
4576 			goto done;
4577 
4578 		err = add_color(&s->colors,
4579 		    "^(commit [0-9a-f]|parent [0-9]|"
4580 		    "(blob|file|tree|commit) [-+] |"
4581 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4582 		    get_color_value("TOG_COLOR_DIFF_META"));
4583 		if (err)
4584 			goto done;
4585 
4586 		err = add_color(&s->colors,
4587 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4588 		    get_color_value("TOG_COLOR_AUTHOR"));
4589 		if (err)
4590 			goto done;
4591 
4592 		err = add_color(&s->colors,
4593 		    "^date: ", TOG_COLOR_DATE,
4594 		    get_color_value("TOG_COLOR_DATE"));
4595 		if (err)
4596 			goto done;
4597 	}
4598 
4599 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4600 	    view_is_splitscreen(view))
4601 		show_log_view(parent_view); /* draw border */
4602 	diff_view_indicate_progress(view);
4603 
4604 	err = create_diff(s);
4605 
4606 	view->show = show_diff_view;
4607 	view->input = input_diff_view;
4608 	view->reset = reset_diff_view;
4609 	view->close = close_diff_view;
4610 	view->search_start = search_start_diff_view;
4611 	view->search_next = search_next_diff_view;
4612 done:
4613 	if (err)
4614 		close_diff_view(view);
4615 	return err;
4616 }
4617 
4618 static const struct got_error *
4619 show_diff_view(struct tog_view *view)
4620 {
4621 	const struct got_error *err;
4622 	struct tog_diff_view_state *s = &view->state.diff;
4623 	char *id_str1 = NULL, *id_str2, *header;
4624 	const char *label1, *label2;
4625 
4626 	if (s->id1) {
4627 		err = got_object_id_str(&id_str1, s->id1);
4628 		if (err)
4629 			return err;
4630 		label1 = s->label1 ? : id_str1;
4631 	} else
4632 		label1 = "/dev/null";
4633 
4634 	err = got_object_id_str(&id_str2, s->id2);
4635 	if (err)
4636 		return err;
4637 	label2 = s->label2 ? : id_str2;
4638 
4639 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4640 		err = got_error_from_errno("asprintf");
4641 		free(id_str1);
4642 		free(id_str2);
4643 		return err;
4644 	}
4645 	free(id_str1);
4646 	free(id_str2);
4647 
4648 	err = draw_file(view, header);
4649 	free(header);
4650 	return err;
4651 }
4652 
4653 static const struct got_error *
4654 set_selected_commit(struct tog_diff_view_state *s,
4655     struct commit_queue_entry *entry)
4656 {
4657 	const struct got_error *err;
4658 	const struct got_object_id_queue *parent_ids;
4659 	struct got_commit_object *selected_commit;
4660 	struct got_object_qid *pid;
4661 
4662 	free(s->id2);
4663 	s->id2 = got_object_id_dup(entry->id);
4664 	if (s->id2 == NULL)
4665 		return got_error_from_errno("got_object_id_dup");
4666 
4667 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4668 	if (err)
4669 		return err;
4670 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4671 	free(s->id1);
4672 	pid = STAILQ_FIRST(parent_ids);
4673 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4674 	got_object_commit_close(selected_commit);
4675 	return NULL;
4676 }
4677 
4678 static const struct got_error *
4679 reset_diff_view(struct tog_view *view)
4680 {
4681 	struct tog_diff_view_state *s = &view->state.diff;
4682 
4683 	view->count = 0;
4684 	wclear(view->window);
4685 	s->first_displayed_line = 1;
4686 	s->last_displayed_line = view->nlines;
4687 	s->matched_line = 0;
4688 	diff_view_indicate_progress(view);
4689 	return create_diff(s);
4690 }
4691 
4692 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4693     int, int, int);
4694 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4695     int, int);
4696 
4697 static const struct got_error *
4698 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4699 {
4700 	const struct got_error *err = NULL;
4701 	struct tog_diff_view_state *s = &view->state.diff;
4702 	struct tog_log_view_state *ls;
4703 	struct commit_queue_entry *old_selected_entry;
4704 	char *line = NULL;
4705 	size_t linesize = 0;
4706 	ssize_t linelen;
4707 	int i, nscroll = view->nlines - 1, up = 0;
4708 
4709 	switch (ch) {
4710 	case '0':
4711 		view->x = 0;
4712 		break;
4713 	case '$':
4714 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4715 		view->count = 0;
4716 		break;
4717 	case KEY_RIGHT:
4718 	case 'l':
4719 		if (view->x + view->ncols / 3 < view->maxx)
4720 			view->x += 2;  /* move two columns right */
4721 		else
4722 			view->count = 0;
4723 		break;
4724 	case KEY_LEFT:
4725 	case 'h':
4726 		view->x -= MIN(view->x, 2);  /* move two columns back */
4727 		if (view->x <= 0)
4728 			view->count = 0;
4729 		break;
4730 	case 'a':
4731 	case 'w':
4732 		if (ch == 'a')
4733 			s->force_text_diff = !s->force_text_diff;
4734 		if (ch == 'w')
4735 			s->ignore_whitespace = !s->ignore_whitespace;
4736 		err = reset_diff_view(view);
4737 		break;
4738 	case 'g':
4739 	case KEY_HOME:
4740 		s->first_displayed_line = 1;
4741 		view->count = 0;
4742 		break;
4743 	case 'G':
4744 	case KEY_END:
4745 		view->count = 0;
4746 		if (s->eof)
4747 			break;
4748 
4749 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4750 		s->eof = 1;
4751 		break;
4752 	case 'k':
4753 	case KEY_UP:
4754 	case CTRL('p'):
4755 		if (s->first_displayed_line > 1)
4756 			s->first_displayed_line--;
4757 		else
4758 			view->count = 0;
4759 		break;
4760 	case CTRL('u'):
4761 	case 'u':
4762 		nscroll /= 2;
4763 		/* FALL THROUGH */
4764 	case KEY_PPAGE:
4765 	case CTRL('b'):
4766 	case 'b':
4767 		if (s->first_displayed_line == 1) {
4768 			view->count = 0;
4769 			break;
4770 		}
4771 		i = 0;
4772 		while (i++ < nscroll && s->first_displayed_line > 1)
4773 			s->first_displayed_line--;
4774 		break;
4775 	case 'j':
4776 	case KEY_DOWN:
4777 	case CTRL('n'):
4778 		if (!s->eof)
4779 			s->first_displayed_line++;
4780 		else
4781 			view->count = 0;
4782 		break;
4783 	case CTRL('d'):
4784 	case 'd':
4785 		nscroll /= 2;
4786 		/* FALL THROUGH */
4787 	case KEY_NPAGE:
4788 	case CTRL('f'):
4789 	case 'f':
4790 	case ' ':
4791 		if (s->eof) {
4792 			view->count = 0;
4793 			break;
4794 		}
4795 		i = 0;
4796 		while (!s->eof && i++ < nscroll) {
4797 			linelen = getline(&line, &linesize, s->f);
4798 			s->first_displayed_line++;
4799 			if (linelen == -1) {
4800 				if (feof(s->f)) {
4801 					s->eof = 1;
4802 				} else
4803 					err = got_ferror(s->f, GOT_ERR_IO);
4804 				break;
4805 			}
4806 		}
4807 		free(line);
4808 		break;
4809 	case '[':
4810 		if (s->diff_context > 0) {
4811 			s->diff_context--;
4812 			s->matched_line = 0;
4813 			diff_view_indicate_progress(view);
4814 			err = create_diff(s);
4815 			if (s->first_displayed_line + view->nlines - 1 >
4816 			    s->nlines) {
4817 				s->first_displayed_line = 1;
4818 				s->last_displayed_line = view->nlines;
4819 			}
4820 		} else
4821 			view->count = 0;
4822 		break;
4823 	case ']':
4824 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4825 			s->diff_context++;
4826 			s->matched_line = 0;
4827 			diff_view_indicate_progress(view);
4828 			err = create_diff(s);
4829 		} else
4830 			view->count = 0;
4831 		break;
4832 	case '<':
4833 	case ',':
4834 		up = 1;
4835 		/* FALL THROUGH */
4836 	case '>':
4837 	case '.':
4838 		if (s->parent_view == NULL) {
4839 			view->count = 0;
4840 			break;
4841 		}
4842 		s->parent_view->count = view->count;
4843 
4844 		if (s->parent_view->type == TOG_VIEW_LOG) {
4845 			ls = &s->parent_view->state.log;
4846 			old_selected_entry = ls->selected_entry;
4847 
4848 			err = input_log_view(NULL, s->parent_view,
4849 			    up ? KEY_UP : KEY_DOWN);
4850 			if (err)
4851 				break;
4852 			view->count = s->parent_view->count;
4853 
4854 			if (old_selected_entry == ls->selected_entry)
4855 				break;
4856 
4857 			err = set_selected_commit(s, ls->selected_entry);
4858 			if (err)
4859 				break;
4860 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4861 			struct tog_blame_view_state *bs;
4862 			struct got_object_id *id, *prev_id;
4863 
4864 			bs = &s->parent_view->state.blame;
4865 			prev_id = get_annotation_for_line(bs->blame.lines,
4866 			    bs->blame.nlines, bs->last_diffed_line);
4867 
4868 			err = input_blame_view(&view, s->parent_view,
4869 			    up ? KEY_UP : KEY_DOWN);
4870 			if (err)
4871 				break;
4872 			view->count = s->parent_view->count;
4873 
4874 			if (prev_id == NULL)
4875 				break;
4876 			id = get_selected_commit_id(bs->blame.lines,
4877 			    bs->blame.nlines, bs->first_displayed_line,
4878 			    bs->selected_line);
4879 			if (id == NULL)
4880 				break;
4881 
4882 			if (!got_object_id_cmp(prev_id, id))
4883 				break;
4884 
4885 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4886 			if (err)
4887 				break;
4888 		}
4889 		s->first_displayed_line = 1;
4890 		s->last_displayed_line = view->nlines;
4891 		s->matched_line = 0;
4892 		view->x = 0;
4893 
4894 		diff_view_indicate_progress(view);
4895 		err = create_diff(s);
4896 		break;
4897 	default:
4898 		view->count = 0;
4899 		break;
4900 	}
4901 
4902 	return err;
4903 }
4904 
4905 static const struct got_error *
4906 cmd_diff(int argc, char *argv[])
4907 {
4908 	const struct got_error *error = NULL;
4909 	struct got_repository *repo = NULL;
4910 	struct got_worktree *worktree = NULL;
4911 	struct got_object_id *id1 = NULL, *id2 = NULL;
4912 	char *repo_path = NULL, *cwd = NULL;
4913 	char *id_str1 = NULL, *id_str2 = NULL;
4914 	char *label1 = NULL, *label2 = NULL;
4915 	int diff_context = 3, ignore_whitespace = 0;
4916 	int ch, force_text_diff = 0;
4917 	const char *errstr;
4918 	struct tog_view *view;
4919 	int *pack_fds = NULL;
4920 
4921 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4922 		switch (ch) {
4923 		case 'a':
4924 			force_text_diff = 1;
4925 			break;
4926 		case 'C':
4927 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4928 			    &errstr);
4929 			if (errstr != NULL)
4930 				errx(1, "number of context lines is %s: %s",
4931 				    errstr, errstr);
4932 			break;
4933 		case 'r':
4934 			repo_path = realpath(optarg, NULL);
4935 			if (repo_path == NULL)
4936 				return got_error_from_errno2("realpath",
4937 				    optarg);
4938 			got_path_strip_trailing_slashes(repo_path);
4939 			break;
4940 		case 'w':
4941 			ignore_whitespace = 1;
4942 			break;
4943 		default:
4944 			usage_diff();
4945 			/* NOTREACHED */
4946 		}
4947 	}
4948 
4949 	argc -= optind;
4950 	argv += optind;
4951 
4952 	if (argc == 0) {
4953 		usage_diff(); /* TODO show local worktree changes */
4954 	} else if (argc == 2) {
4955 		id_str1 = argv[0];
4956 		id_str2 = argv[1];
4957 	} else
4958 		usage_diff();
4959 
4960 	error = got_repo_pack_fds_open(&pack_fds);
4961 	if (error)
4962 		goto done;
4963 
4964 	if (repo_path == NULL) {
4965 		cwd = getcwd(NULL, 0);
4966 		if (cwd == NULL)
4967 			return got_error_from_errno("getcwd");
4968 		error = got_worktree_open(&worktree, cwd);
4969 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4970 			goto done;
4971 		if (worktree)
4972 			repo_path =
4973 			    strdup(got_worktree_get_repo_path(worktree));
4974 		else
4975 			repo_path = strdup(cwd);
4976 		if (repo_path == NULL) {
4977 			error = got_error_from_errno("strdup");
4978 			goto done;
4979 		}
4980 	}
4981 
4982 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4983 	if (error)
4984 		goto done;
4985 
4986 	init_curses();
4987 
4988 	error = apply_unveil(got_repo_get_path(repo), NULL);
4989 	if (error)
4990 		goto done;
4991 
4992 	error = tog_load_refs(repo, 0);
4993 	if (error)
4994 		goto done;
4995 
4996 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4997 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4998 	if (error)
4999 		goto done;
5000 
5001 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5002 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5003 	if (error)
5004 		goto done;
5005 
5006 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5007 	if (view == NULL) {
5008 		error = got_error_from_errno("view_open");
5009 		goto done;
5010 	}
5011 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5012 	    ignore_whitespace, force_text_diff, NULL,  repo);
5013 	if (error)
5014 		goto done;
5015 	error = view_loop(view);
5016 done:
5017 	free(label1);
5018 	free(label2);
5019 	free(repo_path);
5020 	free(cwd);
5021 	if (repo) {
5022 		const struct got_error *close_err = got_repo_close(repo);
5023 		if (error == NULL)
5024 			error = close_err;
5025 	}
5026 	if (worktree)
5027 		got_worktree_close(worktree);
5028 	if (pack_fds) {
5029 		const struct got_error *pack_err =
5030 		    got_repo_pack_fds_close(pack_fds);
5031 		if (error == NULL)
5032 			error = pack_err;
5033 	}
5034 	tog_free_refs();
5035 	return error;
5036 }
5037 
5038 __dead static void
5039 usage_blame(void)
5040 {
5041 	endwin();
5042 	fprintf(stderr,
5043 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5044 	    getprogname());
5045 	exit(1);
5046 }
5047 
5048 struct tog_blame_line {
5049 	int annotated;
5050 	struct got_object_id *id;
5051 };
5052 
5053 static const struct got_error *
5054 draw_blame(struct tog_view *view)
5055 {
5056 	struct tog_blame_view_state *s = &view->state.blame;
5057 	struct tog_blame *blame = &s->blame;
5058 	regmatch_t *regmatch = &view->regmatch;
5059 	const struct got_error *err;
5060 	int lineno = 0, nprinted = 0;
5061 	char *line = NULL;
5062 	size_t linesize = 0;
5063 	ssize_t linelen;
5064 	wchar_t *wline;
5065 	int width;
5066 	struct tog_blame_line *blame_line;
5067 	struct got_object_id *prev_id = NULL;
5068 	char *id_str;
5069 	struct tog_color *tc;
5070 
5071 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5072 	if (err)
5073 		return err;
5074 
5075 	rewind(blame->f);
5076 	werase(view->window);
5077 
5078 	if (asprintf(&line, "commit %s", id_str) == -1) {
5079 		err = got_error_from_errno("asprintf");
5080 		free(id_str);
5081 		return err;
5082 	}
5083 
5084 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5085 	free(line);
5086 	line = NULL;
5087 	if (err)
5088 		return err;
5089 	if (view_needs_focus_indication(view))
5090 		wstandout(view->window);
5091 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5092 	if (tc)
5093 		wattr_on(view->window,
5094 		    COLOR_PAIR(tc->colorpair), NULL);
5095 	waddwstr(view->window, wline);
5096 	if (tc)
5097 		wattr_off(view->window,
5098 		    COLOR_PAIR(tc->colorpair), NULL);
5099 	if (view_needs_focus_indication(view))
5100 		wstandend(view->window);
5101 	free(wline);
5102 	wline = NULL;
5103 	if (width < view->ncols - 1)
5104 		waddch(view->window, '\n');
5105 
5106 	if (asprintf(&line, "[%d/%d] %s%s",
5107 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5108 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5109 		free(id_str);
5110 		return got_error_from_errno("asprintf");
5111 	}
5112 	free(id_str);
5113 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5114 	free(line);
5115 	line = NULL;
5116 	if (err)
5117 		return err;
5118 	waddwstr(view->window, wline);
5119 	free(wline);
5120 	wline = NULL;
5121 	if (width < view->ncols - 1)
5122 		waddch(view->window, '\n');
5123 
5124 	s->eof = 0;
5125 	view->maxx = 0;
5126 	while (nprinted < view->nlines - 2) {
5127 		linelen = getline(&line, &linesize, blame->f);
5128 		if (linelen == -1) {
5129 			if (feof(blame->f)) {
5130 				s->eof = 1;
5131 				break;
5132 			}
5133 			free(line);
5134 			return got_ferror(blame->f, GOT_ERR_IO);
5135 		}
5136 		if (++lineno < s->first_displayed_line)
5137 			continue;
5138 
5139 		/* Set view->maxx based on full line length. */
5140 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5141 		if (err) {
5142 			free(line);
5143 			return err;
5144 		}
5145 		free(wline);
5146 		wline = NULL;
5147 		view->maxx = MAX(view->maxx, width);
5148 
5149 		if (nprinted == s->selected_line - 1)
5150 			wstandout(view->window);
5151 
5152 		if (blame->nlines > 0) {
5153 			blame_line = &blame->lines[lineno - 1];
5154 			if (blame_line->annotated && prev_id &&
5155 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5156 			    !(nprinted == s->selected_line - 1)) {
5157 				waddstr(view->window, "        ");
5158 			} else if (blame_line->annotated) {
5159 				char *id_str;
5160 				err = got_object_id_str(&id_str,
5161 				    blame_line->id);
5162 				if (err) {
5163 					free(line);
5164 					return err;
5165 				}
5166 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5167 				if (tc)
5168 					wattr_on(view->window,
5169 					    COLOR_PAIR(tc->colorpair), NULL);
5170 				wprintw(view->window, "%.8s", id_str);
5171 				if (tc)
5172 					wattr_off(view->window,
5173 					    COLOR_PAIR(tc->colorpair), NULL);
5174 				free(id_str);
5175 				prev_id = blame_line->id;
5176 			} else {
5177 				waddstr(view->window, "........");
5178 				prev_id = NULL;
5179 			}
5180 		} else {
5181 			waddstr(view->window, "........");
5182 			prev_id = NULL;
5183 		}
5184 
5185 		if (nprinted == s->selected_line - 1)
5186 			wstandend(view->window);
5187 		waddstr(view->window, " ");
5188 
5189 		if (view->ncols <= 9) {
5190 			width = 9;
5191 		} else if (s->first_displayed_line + nprinted ==
5192 		    s->matched_line &&
5193 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5194 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5195 			    view->window, view->x, regmatch);
5196 			if (err) {
5197 				free(line);
5198 				return err;
5199 			}
5200 			width += 9;
5201 		} else {
5202 			int skip;
5203 			err = format_line(&wline, &width, &skip, line,
5204 			    view->x, view->ncols - 9, 9, 1);
5205 			if (err) {
5206 				free(line);
5207 				return err;
5208 			}
5209 			waddwstr(view->window, &wline[skip]);
5210 			width += 9;
5211 			free(wline);
5212 			wline = NULL;
5213 		}
5214 
5215 		if (width <= view->ncols - 1)
5216 			waddch(view->window, '\n');
5217 		if (++nprinted == 1)
5218 			s->first_displayed_line = lineno;
5219 	}
5220 	free(line);
5221 	s->last_displayed_line = lineno;
5222 
5223 	view_border(view);
5224 
5225 	return NULL;
5226 }
5227 
5228 static const struct got_error *
5229 blame_cb(void *arg, int nlines, int lineno,
5230     struct got_commit_object *commit, struct got_object_id *id)
5231 {
5232 	const struct got_error *err = NULL;
5233 	struct tog_blame_cb_args *a = arg;
5234 	struct tog_blame_line *line;
5235 	int errcode;
5236 
5237 	if (nlines != a->nlines ||
5238 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5239 		return got_error(GOT_ERR_RANGE);
5240 
5241 	errcode = pthread_mutex_lock(&tog_mutex);
5242 	if (errcode)
5243 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5244 
5245 	if (*a->quit) {	/* user has quit the blame view */
5246 		err = got_error(GOT_ERR_ITER_COMPLETED);
5247 		goto done;
5248 	}
5249 
5250 	if (lineno == -1)
5251 		goto done; /* no change in this commit */
5252 
5253 	line = &a->lines[lineno - 1];
5254 	if (line->annotated)
5255 		goto done;
5256 
5257 	line->id = got_object_id_dup(id);
5258 	if (line->id == NULL) {
5259 		err = got_error_from_errno("got_object_id_dup");
5260 		goto done;
5261 	}
5262 	line->annotated = 1;
5263 done:
5264 	errcode = pthread_mutex_unlock(&tog_mutex);
5265 	if (errcode)
5266 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5267 	return err;
5268 }
5269 
5270 static void *
5271 blame_thread(void *arg)
5272 {
5273 	const struct got_error *err, *close_err;
5274 	struct tog_blame_thread_args *ta = arg;
5275 	struct tog_blame_cb_args *a = ta->cb_args;
5276 	int errcode, fd1 = -1, fd2 = -1;
5277 	FILE *f1 = NULL, *f2 = NULL;
5278 
5279 	fd1 = got_opentempfd();
5280 	if (fd1 == -1)
5281 		return (void *)got_error_from_errno("got_opentempfd");
5282 
5283 	fd2 = got_opentempfd();
5284 	if (fd2 == -1) {
5285 		err = got_error_from_errno("got_opentempfd");
5286 		goto done;
5287 	}
5288 
5289 	f1 = got_opentemp();
5290 	if (f1 == NULL) {
5291 		err = (void *)got_error_from_errno("got_opentemp");
5292 		goto done;
5293 	}
5294 	f2 = got_opentemp();
5295 	if (f2 == NULL) {
5296 		err = (void *)got_error_from_errno("got_opentemp");
5297 		goto done;
5298 	}
5299 
5300 	err = block_signals_used_by_main_thread();
5301 	if (err)
5302 		goto done;
5303 
5304 	err = got_blame(ta->path, a->commit_id, ta->repo,
5305 	    tog_diff_algo, blame_cb, ta->cb_args,
5306 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5307 	if (err && err->code == GOT_ERR_CANCELLED)
5308 		err = NULL;
5309 
5310 	errcode = pthread_mutex_lock(&tog_mutex);
5311 	if (errcode) {
5312 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5313 		goto done;
5314 	}
5315 
5316 	close_err = got_repo_close(ta->repo);
5317 	if (err == NULL)
5318 		err = close_err;
5319 	ta->repo = NULL;
5320 	*ta->complete = 1;
5321 
5322 	errcode = pthread_mutex_unlock(&tog_mutex);
5323 	if (errcode && err == NULL)
5324 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5325 
5326 done:
5327 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5328 		err = got_error_from_errno("close");
5329 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5330 		err = got_error_from_errno("close");
5331 	if (f1 && fclose(f1) == EOF && err == NULL)
5332 		err = got_error_from_errno("fclose");
5333 	if (f2 && fclose(f2) == EOF && err == NULL)
5334 		err = got_error_from_errno("fclose");
5335 
5336 	return (void *)err;
5337 }
5338 
5339 static struct got_object_id *
5340 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5341     int first_displayed_line, int selected_line)
5342 {
5343 	struct tog_blame_line *line;
5344 
5345 	if (nlines <= 0)
5346 		return NULL;
5347 
5348 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5349 	if (!line->annotated)
5350 		return NULL;
5351 
5352 	return line->id;
5353 }
5354 
5355 static struct got_object_id *
5356 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5357     int lineno)
5358 {
5359 	struct tog_blame_line *line;
5360 
5361 	if (nlines <= 0 || lineno >= nlines)
5362 		return NULL;
5363 
5364 	line = &lines[lineno - 1];
5365 	if (!line->annotated)
5366 		return NULL;
5367 
5368 	return line->id;
5369 }
5370 
5371 static const struct got_error *
5372 stop_blame(struct tog_blame *blame)
5373 {
5374 	const struct got_error *err = NULL;
5375 	int i;
5376 
5377 	if (blame->thread) {
5378 		int errcode;
5379 		errcode = pthread_mutex_unlock(&tog_mutex);
5380 		if (errcode)
5381 			return got_error_set_errno(errcode,
5382 			    "pthread_mutex_unlock");
5383 		errcode = pthread_join(blame->thread, (void **)&err);
5384 		if (errcode)
5385 			return got_error_set_errno(errcode, "pthread_join");
5386 		errcode = pthread_mutex_lock(&tog_mutex);
5387 		if (errcode)
5388 			return got_error_set_errno(errcode,
5389 			    "pthread_mutex_lock");
5390 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5391 			err = NULL;
5392 		blame->thread = 0; //NULL;
5393 	}
5394 	if (blame->thread_args.repo) {
5395 		const struct got_error *close_err;
5396 		close_err = got_repo_close(blame->thread_args.repo);
5397 		if (err == NULL)
5398 			err = close_err;
5399 		blame->thread_args.repo = NULL;
5400 	}
5401 	if (blame->f) {
5402 		if (fclose(blame->f) == EOF && err == NULL)
5403 			err = got_error_from_errno("fclose");
5404 		blame->f = NULL;
5405 	}
5406 	if (blame->lines) {
5407 		for (i = 0; i < blame->nlines; i++)
5408 			free(blame->lines[i].id);
5409 		free(blame->lines);
5410 		blame->lines = NULL;
5411 	}
5412 	free(blame->cb_args.commit_id);
5413 	blame->cb_args.commit_id = NULL;
5414 	if (blame->pack_fds) {
5415 		const struct got_error *pack_err =
5416 		    got_repo_pack_fds_close(blame->pack_fds);
5417 		if (err == NULL)
5418 			err = pack_err;
5419 		blame->pack_fds = NULL;
5420 	}
5421 	return err;
5422 }
5423 
5424 static const struct got_error *
5425 cancel_blame_view(void *arg)
5426 {
5427 	const struct got_error *err = NULL;
5428 	int *done = arg;
5429 	int errcode;
5430 
5431 	errcode = pthread_mutex_lock(&tog_mutex);
5432 	if (errcode)
5433 		return got_error_set_errno(errcode,
5434 		    "pthread_mutex_unlock");
5435 
5436 	if (*done)
5437 		err = got_error(GOT_ERR_CANCELLED);
5438 
5439 	errcode = pthread_mutex_unlock(&tog_mutex);
5440 	if (errcode)
5441 		return got_error_set_errno(errcode,
5442 		    "pthread_mutex_lock");
5443 
5444 	return err;
5445 }
5446 
5447 static const struct got_error *
5448 run_blame(struct tog_view *view)
5449 {
5450 	struct tog_blame_view_state *s = &view->state.blame;
5451 	struct tog_blame *blame = &s->blame;
5452 	const struct got_error *err = NULL;
5453 	struct got_commit_object *commit = NULL;
5454 	struct got_blob_object *blob = NULL;
5455 	struct got_repository *thread_repo = NULL;
5456 	struct got_object_id *obj_id = NULL;
5457 	int obj_type, fd = -1;
5458 	int *pack_fds = NULL;
5459 
5460 	err = got_object_open_as_commit(&commit, s->repo,
5461 	    &s->blamed_commit->id);
5462 	if (err)
5463 		return err;
5464 
5465 	fd = got_opentempfd();
5466 	if (fd == -1) {
5467 		err = got_error_from_errno("got_opentempfd");
5468 		goto done;
5469 	}
5470 
5471 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5472 	if (err)
5473 		goto done;
5474 
5475 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5476 	if (err)
5477 		goto done;
5478 
5479 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5480 		err = got_error(GOT_ERR_OBJ_TYPE);
5481 		goto done;
5482 	}
5483 
5484 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5485 	if (err)
5486 		goto done;
5487 	blame->f = got_opentemp();
5488 	if (blame->f == NULL) {
5489 		err = got_error_from_errno("got_opentemp");
5490 		goto done;
5491 	}
5492 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5493 	    &blame->line_offsets, blame->f, blob);
5494 	if (err)
5495 		goto done;
5496 	if (blame->nlines == 0) {
5497 		s->blame_complete = 1;
5498 		goto done;
5499 	}
5500 
5501 	/* Don't include \n at EOF in the blame line count. */
5502 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5503 		blame->nlines--;
5504 
5505 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5506 	if (blame->lines == NULL) {
5507 		err = got_error_from_errno("calloc");
5508 		goto done;
5509 	}
5510 
5511 	err = got_repo_pack_fds_open(&pack_fds);
5512 	if (err)
5513 		goto done;
5514 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5515 	    pack_fds);
5516 	if (err)
5517 		goto done;
5518 
5519 	blame->pack_fds = pack_fds;
5520 	blame->cb_args.view = view;
5521 	blame->cb_args.lines = blame->lines;
5522 	blame->cb_args.nlines = blame->nlines;
5523 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5524 	if (blame->cb_args.commit_id == NULL) {
5525 		err = got_error_from_errno("got_object_id_dup");
5526 		goto done;
5527 	}
5528 	blame->cb_args.quit = &s->done;
5529 
5530 	blame->thread_args.path = s->path;
5531 	blame->thread_args.repo = thread_repo;
5532 	blame->thread_args.cb_args = &blame->cb_args;
5533 	blame->thread_args.complete = &s->blame_complete;
5534 	blame->thread_args.cancel_cb = cancel_blame_view;
5535 	blame->thread_args.cancel_arg = &s->done;
5536 	s->blame_complete = 0;
5537 
5538 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5539 		s->first_displayed_line = 1;
5540 		s->last_displayed_line = view->nlines;
5541 		s->selected_line = 1;
5542 	}
5543 	s->matched_line = 0;
5544 
5545 done:
5546 	if (commit)
5547 		got_object_commit_close(commit);
5548 	if (fd != -1 && close(fd) == -1 && err == NULL)
5549 		err = got_error_from_errno("close");
5550 	if (blob)
5551 		got_object_blob_close(blob);
5552 	free(obj_id);
5553 	if (err)
5554 		stop_blame(blame);
5555 	return err;
5556 }
5557 
5558 static const struct got_error *
5559 open_blame_view(struct tog_view *view, char *path,
5560     struct got_object_id *commit_id, struct got_repository *repo)
5561 {
5562 	const struct got_error *err = NULL;
5563 	struct tog_blame_view_state *s = &view->state.blame;
5564 
5565 	STAILQ_INIT(&s->blamed_commits);
5566 
5567 	s->path = strdup(path);
5568 	if (s->path == NULL)
5569 		return got_error_from_errno("strdup");
5570 
5571 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5572 	if (err) {
5573 		free(s->path);
5574 		return err;
5575 	}
5576 
5577 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5578 	s->first_displayed_line = 1;
5579 	s->last_displayed_line = view->nlines;
5580 	s->selected_line = 1;
5581 	s->blame_complete = 0;
5582 	s->repo = repo;
5583 	s->commit_id = commit_id;
5584 	memset(&s->blame, 0, sizeof(s->blame));
5585 
5586 	STAILQ_INIT(&s->colors);
5587 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5588 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5589 		    get_color_value("TOG_COLOR_COMMIT"));
5590 		if (err)
5591 			return err;
5592 	}
5593 
5594 	view->show = show_blame_view;
5595 	view->input = input_blame_view;
5596 	view->reset = reset_blame_view;
5597 	view->close = close_blame_view;
5598 	view->search_start = search_start_blame_view;
5599 	view->search_next = search_next_blame_view;
5600 
5601 	return run_blame(view);
5602 }
5603 
5604 static const struct got_error *
5605 close_blame_view(struct tog_view *view)
5606 {
5607 	const struct got_error *err = NULL;
5608 	struct tog_blame_view_state *s = &view->state.blame;
5609 
5610 	if (s->blame.thread)
5611 		err = stop_blame(&s->blame);
5612 
5613 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5614 		struct got_object_qid *blamed_commit;
5615 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5616 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5617 		got_object_qid_free(blamed_commit);
5618 	}
5619 
5620 	free(s->path);
5621 	free_colors(&s->colors);
5622 	return err;
5623 }
5624 
5625 static const struct got_error *
5626 search_start_blame_view(struct tog_view *view)
5627 {
5628 	struct tog_blame_view_state *s = &view->state.blame;
5629 
5630 	s->matched_line = 0;
5631 	return NULL;
5632 }
5633 
5634 static const struct got_error *
5635 search_next_blame_view(struct tog_view *view)
5636 {
5637 	struct tog_blame_view_state *s = &view->state.blame;
5638 	const struct got_error *err = NULL;
5639 	int lineno;
5640 	char *line = NULL;
5641 	size_t linesize = 0;
5642 	ssize_t linelen;
5643 
5644 	if (!view->searching) {
5645 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5646 		return NULL;
5647 	}
5648 
5649 	if (s->matched_line) {
5650 		if (view->searching == TOG_SEARCH_FORWARD)
5651 			lineno = s->matched_line + 1;
5652 		else
5653 			lineno = s->matched_line - 1;
5654 	} else
5655 		lineno = s->first_displayed_line - 1 + s->selected_line;
5656 
5657 	while (1) {
5658 		off_t offset;
5659 
5660 		if (lineno <= 0 || lineno > s->blame.nlines) {
5661 			if (s->matched_line == 0) {
5662 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5663 				break;
5664 			}
5665 
5666 			if (view->searching == TOG_SEARCH_FORWARD)
5667 				lineno = 1;
5668 			else
5669 				lineno = s->blame.nlines;
5670 		}
5671 
5672 		offset = s->blame.line_offsets[lineno - 1];
5673 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5674 			free(line);
5675 			return got_error_from_errno("fseeko");
5676 		}
5677 		linelen = getline(&line, &linesize, s->blame.f);
5678 		if (linelen != -1) {
5679 			char *exstr;
5680 			err = expand_tab(&exstr, line);
5681 			if (err)
5682 				break;
5683 			if (match_line(exstr, &view->regex, 1,
5684 			    &view->regmatch)) {
5685 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5686 				s->matched_line = lineno;
5687 				free(exstr);
5688 				break;
5689 			}
5690 			free(exstr);
5691 		}
5692 		if (view->searching == TOG_SEARCH_FORWARD)
5693 			lineno++;
5694 		else
5695 			lineno--;
5696 	}
5697 	free(line);
5698 
5699 	if (s->matched_line) {
5700 		s->first_displayed_line = s->matched_line;
5701 		s->selected_line = 1;
5702 	}
5703 
5704 	return err;
5705 }
5706 
5707 static const struct got_error *
5708 show_blame_view(struct tog_view *view)
5709 {
5710 	const struct got_error *err = NULL;
5711 	struct tog_blame_view_state *s = &view->state.blame;
5712 	int errcode;
5713 
5714 	if (s->blame.thread == 0 && !s->blame_complete) {
5715 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5716 		    &s->blame.thread_args);
5717 		if (errcode)
5718 			return got_error_set_errno(errcode, "pthread_create");
5719 
5720 		halfdelay(1); /* fast refresh while annotating  */
5721 	}
5722 
5723 	if (s->blame_complete)
5724 		halfdelay(10); /* disable fast refresh */
5725 
5726 	err = draw_blame(view);
5727 
5728 	view_border(view);
5729 	return err;
5730 }
5731 
5732 static const struct got_error *
5733 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5734 {
5735 	const struct got_error *err = NULL, *thread_err = NULL;
5736 	struct tog_view *diff_view;
5737 	struct tog_blame_view_state *s = &view->state.blame;
5738 	int eos, nscroll, begin_y = 0, begin_x = 0;
5739 
5740 	eos = nscroll = view->nlines - 2;
5741 	if (view_is_hsplit_top(view))
5742 		--eos;  /* border */
5743 
5744 	switch (ch) {
5745 	case '0':
5746 		view->x = 0;
5747 		break;
5748 	case '$':
5749 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5750 		view->count = 0;
5751 		break;
5752 	case KEY_RIGHT:
5753 	case 'l':
5754 		if (view->x + view->ncols / 3 < view->maxx)
5755 			view->x += 2;  /* move two columns right */
5756 		else
5757 			view->count = 0;
5758 		break;
5759 	case KEY_LEFT:
5760 	case 'h':
5761 		view->x -= MIN(view->x, 2);  /* move two columns back */
5762 		if (view->x <= 0)
5763 			view->count = 0;
5764 		break;
5765 	case 'q':
5766 		s->done = 1;
5767 		break;
5768 	case 'g':
5769 	case KEY_HOME:
5770 		s->selected_line = 1;
5771 		s->first_displayed_line = 1;
5772 		view->count = 0;
5773 		break;
5774 	case 'G':
5775 	case KEY_END:
5776 		if (s->blame.nlines < eos) {
5777 			s->selected_line = s->blame.nlines;
5778 			s->first_displayed_line = 1;
5779 		} else {
5780 			s->selected_line = eos;
5781 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5782 		}
5783 		view->count = 0;
5784 		break;
5785 	case 'k':
5786 	case KEY_UP:
5787 	case CTRL('p'):
5788 		if (s->selected_line > 1)
5789 			s->selected_line--;
5790 		else if (s->selected_line == 1 &&
5791 		    s->first_displayed_line > 1)
5792 			s->first_displayed_line--;
5793 		else
5794 			view->count = 0;
5795 		break;
5796 	case CTRL('u'):
5797 	case 'u':
5798 		nscroll /= 2;
5799 		/* FALL THROUGH */
5800 	case KEY_PPAGE:
5801 	case CTRL('b'):
5802 	case 'b':
5803 		if (s->first_displayed_line == 1) {
5804 			if (view->count > 1)
5805 				nscroll += nscroll;
5806 			s->selected_line = MAX(1, s->selected_line - nscroll);
5807 			view->count = 0;
5808 			break;
5809 		}
5810 		if (s->first_displayed_line > nscroll)
5811 			s->first_displayed_line -= nscroll;
5812 		else
5813 			s->first_displayed_line = 1;
5814 		break;
5815 	case 'j':
5816 	case KEY_DOWN:
5817 	case CTRL('n'):
5818 		if (s->selected_line < eos && s->first_displayed_line +
5819 		    s->selected_line <= s->blame.nlines)
5820 			s->selected_line++;
5821 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5822 			s->first_displayed_line++;
5823 		else
5824 			view->count = 0;
5825 		break;
5826 	case 'c':
5827 	case 'p': {
5828 		struct got_object_id *id = NULL;
5829 
5830 		view->count = 0;
5831 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5832 		    s->first_displayed_line, s->selected_line);
5833 		if (id == NULL)
5834 			break;
5835 		if (ch == 'p') {
5836 			struct got_commit_object *commit, *pcommit;
5837 			struct got_object_qid *pid;
5838 			struct got_object_id *blob_id = NULL;
5839 			int obj_type;
5840 			err = got_object_open_as_commit(&commit,
5841 			    s->repo, id);
5842 			if (err)
5843 				break;
5844 			pid = STAILQ_FIRST(
5845 			    got_object_commit_get_parent_ids(commit));
5846 			if (pid == NULL) {
5847 				got_object_commit_close(commit);
5848 				break;
5849 			}
5850 			/* Check if path history ends here. */
5851 			err = got_object_open_as_commit(&pcommit,
5852 			    s->repo, &pid->id);
5853 			if (err)
5854 				break;
5855 			err = got_object_id_by_path(&blob_id, s->repo,
5856 			    pcommit, s->path);
5857 			got_object_commit_close(pcommit);
5858 			if (err) {
5859 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5860 					err = NULL;
5861 				got_object_commit_close(commit);
5862 				break;
5863 			}
5864 			err = got_object_get_type(&obj_type, s->repo,
5865 			    blob_id);
5866 			free(blob_id);
5867 			/* Can't blame non-blob type objects. */
5868 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5869 				got_object_commit_close(commit);
5870 				break;
5871 			}
5872 			err = got_object_qid_alloc(&s->blamed_commit,
5873 			    &pid->id);
5874 			got_object_commit_close(commit);
5875 		} else {
5876 			if (got_object_id_cmp(id,
5877 			    &s->blamed_commit->id) == 0)
5878 				break;
5879 			err = got_object_qid_alloc(&s->blamed_commit,
5880 			    id);
5881 		}
5882 		if (err)
5883 			break;
5884 		s->done = 1;
5885 		thread_err = stop_blame(&s->blame);
5886 		s->done = 0;
5887 		if (thread_err)
5888 			break;
5889 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5890 		    s->blamed_commit, entry);
5891 		err = run_blame(view);
5892 		if (err)
5893 			break;
5894 		break;
5895 	}
5896 	case 'C': {
5897 		struct got_object_qid *first;
5898 
5899 		view->count = 0;
5900 		first = STAILQ_FIRST(&s->blamed_commits);
5901 		if (!got_object_id_cmp(&first->id, s->commit_id))
5902 			break;
5903 		s->done = 1;
5904 		thread_err = stop_blame(&s->blame);
5905 		s->done = 0;
5906 		if (thread_err)
5907 			break;
5908 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5909 		got_object_qid_free(s->blamed_commit);
5910 		s->blamed_commit =
5911 		    STAILQ_FIRST(&s->blamed_commits);
5912 		err = run_blame(view);
5913 		if (err)
5914 			break;
5915 		break;
5916 	}
5917 	case KEY_ENTER:
5918 	case '\r': {
5919 		struct got_object_id *id = NULL;
5920 		struct got_object_qid *pid;
5921 		struct got_commit_object *commit = NULL;
5922 
5923 		view->count = 0;
5924 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5925 		    s->first_displayed_line, s->selected_line);
5926 		if (id == NULL)
5927 			break;
5928 		err = got_object_open_as_commit(&commit, s->repo, id);
5929 		if (err)
5930 			break;
5931 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5932 		if (*new_view) {
5933 			/* traversed from diff view, release diff resources  */
5934 			err = close_diff_view(*new_view);
5935 			if (err)
5936 				break;
5937 			diff_view = *new_view;
5938 		} else {
5939 			if (view_is_parent_view(view))
5940 				view_get_split(view, &begin_y, &begin_x);
5941 
5942 			diff_view = view_open(0, 0, begin_y, begin_x,
5943 			    TOG_VIEW_DIFF);
5944 			if (diff_view == NULL) {
5945 				got_object_commit_close(commit);
5946 				err = got_error_from_errno("view_open");
5947 				break;
5948 			}
5949 		}
5950 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5951 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
5952 		got_object_commit_close(commit);
5953 		if (err) {
5954 			view_close(diff_view);
5955 			break;
5956 		}
5957 		s->last_diffed_line = s->first_displayed_line - 1 +
5958 		    s->selected_line;
5959 		if (*new_view)
5960 			break;	/* still open from active diff view */
5961 		if (view_is_parent_view(view) &&
5962 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5963 			err = view_init_hsplit(view, begin_y);
5964 			if (err)
5965 				break;
5966 		}
5967 
5968 		view->focussed = 0;
5969 		diff_view->focussed = 1;
5970 		diff_view->mode = view->mode;
5971 		diff_view->nlines = view->lines - begin_y;
5972 		if (view_is_parent_view(view)) {
5973 			view_transfer_size(diff_view, view);
5974 			err = view_close_child(view);
5975 			if (err)
5976 				break;
5977 			err = view_set_child(view, diff_view);
5978 			if (err)
5979 				break;
5980 			view->focus_child = 1;
5981 		} else
5982 			*new_view = diff_view;
5983 		if (err)
5984 			break;
5985 		break;
5986 	}
5987 	case CTRL('d'):
5988 	case 'd':
5989 		nscroll /= 2;
5990 		/* FALL THROUGH */
5991 	case KEY_NPAGE:
5992 	case CTRL('f'):
5993 	case 'f':
5994 	case ' ':
5995 		if (s->last_displayed_line >= s->blame.nlines &&
5996 		    s->selected_line >= MIN(s->blame.nlines,
5997 		    view->nlines - 2)) {
5998 			view->count = 0;
5999 			break;
6000 		}
6001 		if (s->last_displayed_line >= s->blame.nlines &&
6002 		    s->selected_line < view->nlines - 2) {
6003 			s->selected_line +=
6004 			    MIN(nscroll, s->last_displayed_line -
6005 			    s->first_displayed_line - s->selected_line + 1);
6006 		}
6007 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6008 			s->first_displayed_line += nscroll;
6009 		else
6010 			s->first_displayed_line =
6011 			    s->blame.nlines - (view->nlines - 3);
6012 		break;
6013 	case KEY_RESIZE:
6014 		if (s->selected_line > view->nlines - 2) {
6015 			s->selected_line = MIN(s->blame.nlines,
6016 			    view->nlines - 2);
6017 		}
6018 		break;
6019 	default:
6020 		view->count = 0;
6021 		break;
6022 	}
6023 	return thread_err ? thread_err : err;
6024 }
6025 
6026 static const struct got_error *
6027 reset_blame_view(struct tog_view *view)
6028 {
6029 	const struct got_error *err;
6030 	struct tog_blame_view_state *s = &view->state.blame;
6031 
6032 	view->count = 0;
6033 	s->done = 1;
6034 	err = stop_blame(&s->blame);
6035 	s->done = 0;
6036 	if (err)
6037 		return err;
6038 	return run_blame(view);
6039 }
6040 
6041 static const struct got_error *
6042 cmd_blame(int argc, char *argv[])
6043 {
6044 	const struct got_error *error;
6045 	struct got_repository *repo = NULL;
6046 	struct got_worktree *worktree = NULL;
6047 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6048 	char *link_target = NULL;
6049 	struct got_object_id *commit_id = NULL;
6050 	struct got_commit_object *commit = NULL;
6051 	char *commit_id_str = NULL;
6052 	int ch;
6053 	struct tog_view *view;
6054 	int *pack_fds = NULL;
6055 
6056 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6057 		switch (ch) {
6058 		case 'c':
6059 			commit_id_str = optarg;
6060 			break;
6061 		case 'r':
6062 			repo_path = realpath(optarg, NULL);
6063 			if (repo_path == NULL)
6064 				return got_error_from_errno2("realpath",
6065 				    optarg);
6066 			break;
6067 		default:
6068 			usage_blame();
6069 			/* NOTREACHED */
6070 		}
6071 	}
6072 
6073 	argc -= optind;
6074 	argv += optind;
6075 
6076 	if (argc != 1)
6077 		usage_blame();
6078 
6079 	error = got_repo_pack_fds_open(&pack_fds);
6080 	if (error != NULL)
6081 		goto done;
6082 
6083 	if (repo_path == NULL) {
6084 		cwd = getcwd(NULL, 0);
6085 		if (cwd == NULL)
6086 			return got_error_from_errno("getcwd");
6087 		error = got_worktree_open(&worktree, cwd);
6088 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6089 			goto done;
6090 		if (worktree)
6091 			repo_path =
6092 			    strdup(got_worktree_get_repo_path(worktree));
6093 		else
6094 			repo_path = strdup(cwd);
6095 		if (repo_path == NULL) {
6096 			error = got_error_from_errno("strdup");
6097 			goto done;
6098 		}
6099 	}
6100 
6101 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6102 	if (error != NULL)
6103 		goto done;
6104 
6105 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6106 	    worktree);
6107 	if (error)
6108 		goto done;
6109 
6110 	init_curses();
6111 
6112 	error = apply_unveil(got_repo_get_path(repo), NULL);
6113 	if (error)
6114 		goto done;
6115 
6116 	error = tog_load_refs(repo, 0);
6117 	if (error)
6118 		goto done;
6119 
6120 	if (commit_id_str == NULL) {
6121 		struct got_reference *head_ref;
6122 		error = got_ref_open(&head_ref, repo, worktree ?
6123 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6124 		if (error != NULL)
6125 			goto done;
6126 		error = got_ref_resolve(&commit_id, repo, head_ref);
6127 		got_ref_close(head_ref);
6128 	} else {
6129 		error = got_repo_match_object_id(&commit_id, NULL,
6130 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6131 	}
6132 	if (error != NULL)
6133 		goto done;
6134 
6135 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6136 	if (view == NULL) {
6137 		error = got_error_from_errno("view_open");
6138 		goto done;
6139 	}
6140 
6141 	error = got_object_open_as_commit(&commit, repo, commit_id);
6142 	if (error)
6143 		goto done;
6144 
6145 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6146 	    commit, repo);
6147 	if (error)
6148 		goto done;
6149 
6150 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6151 	    commit_id, repo);
6152 	if (error)
6153 		goto done;
6154 	if (worktree) {
6155 		/* Release work tree lock. */
6156 		got_worktree_close(worktree);
6157 		worktree = NULL;
6158 	}
6159 	error = view_loop(view);
6160 done:
6161 	free(repo_path);
6162 	free(in_repo_path);
6163 	free(link_target);
6164 	free(cwd);
6165 	free(commit_id);
6166 	if (commit)
6167 		got_object_commit_close(commit);
6168 	if (worktree)
6169 		got_worktree_close(worktree);
6170 	if (repo) {
6171 		const struct got_error *close_err = got_repo_close(repo);
6172 		if (error == NULL)
6173 			error = close_err;
6174 	}
6175 	if (pack_fds) {
6176 		const struct got_error *pack_err =
6177 		    got_repo_pack_fds_close(pack_fds);
6178 		if (error == NULL)
6179 			error = pack_err;
6180 	}
6181 	tog_free_refs();
6182 	return error;
6183 }
6184 
6185 static const struct got_error *
6186 draw_tree_entries(struct tog_view *view, const char *parent_path)
6187 {
6188 	struct tog_tree_view_state *s = &view->state.tree;
6189 	const struct got_error *err = NULL;
6190 	struct got_tree_entry *te;
6191 	wchar_t *wline;
6192 	struct tog_color *tc;
6193 	int width, n, i, nentries;
6194 	int limit = view->nlines;
6195 
6196 	s->ndisplayed = 0;
6197 	if (view_is_hsplit_top(view))
6198 		--limit;  /* border */
6199 
6200 	werase(view->window);
6201 
6202 	if (limit == 0)
6203 		return NULL;
6204 
6205 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6206 	    0, 0);
6207 	if (err)
6208 		return err;
6209 	if (view_needs_focus_indication(view))
6210 		wstandout(view->window);
6211 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6212 	if (tc)
6213 		wattr_on(view->window,
6214 		    COLOR_PAIR(tc->colorpair), NULL);
6215 	waddwstr(view->window, wline);
6216 	if (tc)
6217 		wattr_off(view->window,
6218 		    COLOR_PAIR(tc->colorpair), NULL);
6219 	if (view_needs_focus_indication(view))
6220 		wstandend(view->window);
6221 	free(wline);
6222 	wline = NULL;
6223 	if (width < view->ncols - 1)
6224 		waddch(view->window, '\n');
6225 	if (--limit <= 0)
6226 		return NULL;
6227 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6228 	    0, 0);
6229 	if (err)
6230 		return err;
6231 	waddwstr(view->window, wline);
6232 	free(wline);
6233 	wline = NULL;
6234 	if (width < view->ncols - 1)
6235 		waddch(view->window, '\n');
6236 	if (--limit <= 0)
6237 		return NULL;
6238 	waddch(view->window, '\n');
6239 	if (--limit <= 0)
6240 		return NULL;
6241 
6242 	if (s->first_displayed_entry == NULL) {
6243 		te = got_object_tree_get_first_entry(s->tree);
6244 		if (s->selected == 0) {
6245 			if (view->focussed)
6246 				wstandout(view->window);
6247 			s->selected_entry = NULL;
6248 		}
6249 		waddstr(view->window, "  ..\n");	/* parent directory */
6250 		if (s->selected == 0 && view->focussed)
6251 			wstandend(view->window);
6252 		s->ndisplayed++;
6253 		if (--limit <= 0)
6254 			return NULL;
6255 		n = 1;
6256 	} else {
6257 		n = 0;
6258 		te = s->first_displayed_entry;
6259 	}
6260 
6261 	nentries = got_object_tree_get_nentries(s->tree);
6262 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6263 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6264 		const char *modestr = "";
6265 		mode_t mode;
6266 
6267 		te = got_object_tree_get_entry(s->tree, i);
6268 		mode = got_tree_entry_get_mode(te);
6269 
6270 		if (s->show_ids) {
6271 			err = got_object_id_str(&id_str,
6272 			    got_tree_entry_get_id(te));
6273 			if (err)
6274 				return got_error_from_errno(
6275 				    "got_object_id_str");
6276 		}
6277 		if (got_object_tree_entry_is_submodule(te))
6278 			modestr = "$";
6279 		else if (S_ISLNK(mode)) {
6280 			int i;
6281 
6282 			err = got_tree_entry_get_symlink_target(&link_target,
6283 			    te, s->repo);
6284 			if (err) {
6285 				free(id_str);
6286 				return err;
6287 			}
6288 			for (i = 0; i < strlen(link_target); i++) {
6289 				if (!isprint((unsigned char)link_target[i]))
6290 					link_target[i] = '?';
6291 			}
6292 			modestr = "@";
6293 		}
6294 		else if (S_ISDIR(mode))
6295 			modestr = "/";
6296 		else if (mode & S_IXUSR)
6297 			modestr = "*";
6298 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6299 		    got_tree_entry_get_name(te), modestr,
6300 		    link_target ? " -> ": "",
6301 		    link_target ? link_target : "") == -1) {
6302 			free(id_str);
6303 			free(link_target);
6304 			return got_error_from_errno("asprintf");
6305 		}
6306 		free(id_str);
6307 		free(link_target);
6308 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6309 		    0, 0);
6310 		if (err) {
6311 			free(line);
6312 			break;
6313 		}
6314 		if (n == s->selected) {
6315 			if (view->focussed)
6316 				wstandout(view->window);
6317 			s->selected_entry = te;
6318 		}
6319 		tc = match_color(&s->colors, line);
6320 		if (tc)
6321 			wattr_on(view->window,
6322 			    COLOR_PAIR(tc->colorpair), NULL);
6323 		waddwstr(view->window, wline);
6324 		if (tc)
6325 			wattr_off(view->window,
6326 			    COLOR_PAIR(tc->colorpair), NULL);
6327 		if (width < view->ncols - 1)
6328 			waddch(view->window, '\n');
6329 		if (n == s->selected && view->focussed)
6330 			wstandend(view->window);
6331 		free(line);
6332 		free(wline);
6333 		wline = NULL;
6334 		n++;
6335 		s->ndisplayed++;
6336 		s->last_displayed_entry = te;
6337 		if (--limit <= 0)
6338 			break;
6339 	}
6340 
6341 	return err;
6342 }
6343 
6344 static void
6345 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6346 {
6347 	struct got_tree_entry *te;
6348 	int isroot = s->tree == s->root;
6349 	int i = 0;
6350 
6351 	if (s->first_displayed_entry == NULL)
6352 		return;
6353 
6354 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6355 	while (i++ < maxscroll) {
6356 		if (te == NULL) {
6357 			if (!isroot)
6358 				s->first_displayed_entry = NULL;
6359 			break;
6360 		}
6361 		s->first_displayed_entry = te;
6362 		te = got_tree_entry_get_prev(s->tree, te);
6363 	}
6364 }
6365 
6366 static const struct got_error *
6367 tree_scroll_down(struct tog_view *view, int maxscroll)
6368 {
6369 	struct tog_tree_view_state *s = &view->state.tree;
6370 	struct got_tree_entry *next, *last;
6371 	int n = 0;
6372 
6373 	if (s->first_displayed_entry)
6374 		next = got_tree_entry_get_next(s->tree,
6375 		    s->first_displayed_entry);
6376 	else
6377 		next = got_object_tree_get_first_entry(s->tree);
6378 
6379 	last = s->last_displayed_entry;
6380 	while (next && n++ < maxscroll) {
6381 		if (last)
6382 			last = got_tree_entry_get_next(s->tree, last);
6383 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6384 			s->first_displayed_entry = next;
6385 			next = got_tree_entry_get_next(s->tree, next);
6386 		}
6387 	}
6388 
6389 	return NULL;
6390 }
6391 
6392 static const struct got_error *
6393 tree_entry_path(char **path, struct tog_parent_trees *parents,
6394     struct got_tree_entry *te)
6395 {
6396 	const struct got_error *err = NULL;
6397 	struct tog_parent_tree *pt;
6398 	size_t len = 2; /* for leading slash and NUL */
6399 
6400 	TAILQ_FOREACH(pt, parents, entry)
6401 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6402 		    + 1 /* slash */;
6403 	if (te)
6404 		len += strlen(got_tree_entry_get_name(te));
6405 
6406 	*path = calloc(1, len);
6407 	if (path == NULL)
6408 		return got_error_from_errno("calloc");
6409 
6410 	(*path)[0] = '/';
6411 	pt = TAILQ_LAST(parents, tog_parent_trees);
6412 	while (pt) {
6413 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6414 		if (strlcat(*path, name, len) >= len) {
6415 			err = got_error(GOT_ERR_NO_SPACE);
6416 			goto done;
6417 		}
6418 		if (strlcat(*path, "/", len) >= len) {
6419 			err = got_error(GOT_ERR_NO_SPACE);
6420 			goto done;
6421 		}
6422 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6423 	}
6424 	if (te) {
6425 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6426 			err = got_error(GOT_ERR_NO_SPACE);
6427 			goto done;
6428 		}
6429 	}
6430 done:
6431 	if (err) {
6432 		free(*path);
6433 		*path = NULL;
6434 	}
6435 	return err;
6436 }
6437 
6438 static const struct got_error *
6439 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6440     struct got_tree_entry *te, struct tog_parent_trees *parents,
6441     struct got_object_id *commit_id, struct got_repository *repo)
6442 {
6443 	const struct got_error *err = NULL;
6444 	char *path;
6445 	struct tog_view *blame_view;
6446 
6447 	*new_view = NULL;
6448 
6449 	err = tree_entry_path(&path, parents, te);
6450 	if (err)
6451 		return err;
6452 
6453 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6454 	if (blame_view == NULL) {
6455 		err = got_error_from_errno("view_open");
6456 		goto done;
6457 	}
6458 
6459 	err = open_blame_view(blame_view, path, commit_id, repo);
6460 	if (err) {
6461 		if (err->code == GOT_ERR_CANCELLED)
6462 			err = NULL;
6463 		view_close(blame_view);
6464 	} else
6465 		*new_view = blame_view;
6466 done:
6467 	free(path);
6468 	return err;
6469 }
6470 
6471 static const struct got_error *
6472 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6473     struct tog_tree_view_state *s)
6474 {
6475 	struct tog_view *log_view;
6476 	const struct got_error *err = NULL;
6477 	char *path;
6478 
6479 	*new_view = NULL;
6480 
6481 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6482 	if (log_view == NULL)
6483 		return got_error_from_errno("view_open");
6484 
6485 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6486 	if (err)
6487 		return err;
6488 
6489 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6490 	    path, 0);
6491 	if (err)
6492 		view_close(log_view);
6493 	else
6494 		*new_view = log_view;
6495 	free(path);
6496 	return err;
6497 }
6498 
6499 static const struct got_error *
6500 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6501     const char *head_ref_name, struct got_repository *repo)
6502 {
6503 	const struct got_error *err = NULL;
6504 	char *commit_id_str = NULL;
6505 	struct tog_tree_view_state *s = &view->state.tree;
6506 	struct got_commit_object *commit = NULL;
6507 
6508 	TAILQ_INIT(&s->parents);
6509 	STAILQ_INIT(&s->colors);
6510 
6511 	s->commit_id = got_object_id_dup(commit_id);
6512 	if (s->commit_id == NULL)
6513 		return got_error_from_errno("got_object_id_dup");
6514 
6515 	err = got_object_open_as_commit(&commit, repo, commit_id);
6516 	if (err)
6517 		goto done;
6518 
6519 	/*
6520 	 * The root is opened here and will be closed when the view is closed.
6521 	 * Any visited subtrees and their path-wise parents are opened and
6522 	 * closed on demand.
6523 	 */
6524 	err = got_object_open_as_tree(&s->root, repo,
6525 	    got_object_commit_get_tree_id(commit));
6526 	if (err)
6527 		goto done;
6528 	s->tree = s->root;
6529 
6530 	err = got_object_id_str(&commit_id_str, commit_id);
6531 	if (err != NULL)
6532 		goto done;
6533 
6534 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6535 		err = got_error_from_errno("asprintf");
6536 		goto done;
6537 	}
6538 
6539 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6540 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6541 	if (head_ref_name) {
6542 		s->head_ref_name = strdup(head_ref_name);
6543 		if (s->head_ref_name == NULL) {
6544 			err = got_error_from_errno("strdup");
6545 			goto done;
6546 		}
6547 	}
6548 	s->repo = repo;
6549 
6550 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6551 		err = add_color(&s->colors, "\\$$",
6552 		    TOG_COLOR_TREE_SUBMODULE,
6553 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6554 		if (err)
6555 			goto done;
6556 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6557 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6558 		if (err)
6559 			goto done;
6560 		err = add_color(&s->colors, "/$",
6561 		    TOG_COLOR_TREE_DIRECTORY,
6562 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6563 		if (err)
6564 			goto done;
6565 
6566 		err = add_color(&s->colors, "\\*$",
6567 		    TOG_COLOR_TREE_EXECUTABLE,
6568 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6569 		if (err)
6570 			goto done;
6571 
6572 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6573 		    get_color_value("TOG_COLOR_COMMIT"));
6574 		if (err)
6575 			goto done;
6576 	}
6577 
6578 	view->show = show_tree_view;
6579 	view->input = input_tree_view;
6580 	view->close = close_tree_view;
6581 	view->search_start = search_start_tree_view;
6582 	view->search_next = search_next_tree_view;
6583 done:
6584 	free(commit_id_str);
6585 	if (commit)
6586 		got_object_commit_close(commit);
6587 	if (err)
6588 		close_tree_view(view);
6589 	return err;
6590 }
6591 
6592 static const struct got_error *
6593 close_tree_view(struct tog_view *view)
6594 {
6595 	struct tog_tree_view_state *s = &view->state.tree;
6596 
6597 	free_colors(&s->colors);
6598 	free(s->tree_label);
6599 	s->tree_label = NULL;
6600 	free(s->commit_id);
6601 	s->commit_id = NULL;
6602 	free(s->head_ref_name);
6603 	s->head_ref_name = NULL;
6604 	while (!TAILQ_EMPTY(&s->parents)) {
6605 		struct tog_parent_tree *parent;
6606 		parent = TAILQ_FIRST(&s->parents);
6607 		TAILQ_REMOVE(&s->parents, parent, entry);
6608 		if (parent->tree != s->root)
6609 			got_object_tree_close(parent->tree);
6610 		free(parent);
6611 
6612 	}
6613 	if (s->tree != NULL && s->tree != s->root)
6614 		got_object_tree_close(s->tree);
6615 	if (s->root)
6616 		got_object_tree_close(s->root);
6617 	return NULL;
6618 }
6619 
6620 static const struct got_error *
6621 search_start_tree_view(struct tog_view *view)
6622 {
6623 	struct tog_tree_view_state *s = &view->state.tree;
6624 
6625 	s->matched_entry = NULL;
6626 	return NULL;
6627 }
6628 
6629 static int
6630 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6631 {
6632 	regmatch_t regmatch;
6633 
6634 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6635 	    0) == 0;
6636 }
6637 
6638 static const struct got_error *
6639 search_next_tree_view(struct tog_view *view)
6640 {
6641 	struct tog_tree_view_state *s = &view->state.tree;
6642 	struct got_tree_entry *te = NULL;
6643 
6644 	if (!view->searching) {
6645 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6646 		return NULL;
6647 	}
6648 
6649 	if (s->matched_entry) {
6650 		if (view->searching == TOG_SEARCH_FORWARD) {
6651 			if (s->selected_entry)
6652 				te = got_tree_entry_get_next(s->tree,
6653 				    s->selected_entry);
6654 			else
6655 				te = got_object_tree_get_first_entry(s->tree);
6656 		} else {
6657 			if (s->selected_entry == NULL)
6658 				te = got_object_tree_get_last_entry(s->tree);
6659 			else
6660 				te = got_tree_entry_get_prev(s->tree,
6661 				    s->selected_entry);
6662 		}
6663 	} else {
6664 		if (s->selected_entry)
6665 			te = s->selected_entry;
6666 		else if (view->searching == TOG_SEARCH_FORWARD)
6667 			te = got_object_tree_get_first_entry(s->tree);
6668 		else
6669 			te = got_object_tree_get_last_entry(s->tree);
6670 	}
6671 
6672 	while (1) {
6673 		if (te == NULL) {
6674 			if (s->matched_entry == NULL) {
6675 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6676 				return NULL;
6677 			}
6678 			if (view->searching == TOG_SEARCH_FORWARD)
6679 				te = got_object_tree_get_first_entry(s->tree);
6680 			else
6681 				te = got_object_tree_get_last_entry(s->tree);
6682 		}
6683 
6684 		if (match_tree_entry(te, &view->regex)) {
6685 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6686 			s->matched_entry = te;
6687 			break;
6688 		}
6689 
6690 		if (view->searching == TOG_SEARCH_FORWARD)
6691 			te = got_tree_entry_get_next(s->tree, te);
6692 		else
6693 			te = got_tree_entry_get_prev(s->tree, te);
6694 	}
6695 
6696 	if (s->matched_entry) {
6697 		s->first_displayed_entry = s->matched_entry;
6698 		s->selected = 0;
6699 	}
6700 
6701 	return NULL;
6702 }
6703 
6704 static const struct got_error *
6705 show_tree_view(struct tog_view *view)
6706 {
6707 	const struct got_error *err = NULL;
6708 	struct tog_tree_view_state *s = &view->state.tree;
6709 	char *parent_path;
6710 
6711 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6712 	if (err)
6713 		return err;
6714 
6715 	err = draw_tree_entries(view, parent_path);
6716 	free(parent_path);
6717 
6718 	view_border(view);
6719 	return err;
6720 }
6721 
6722 static const struct got_error *
6723 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6724 {
6725 	const struct got_error *err = NULL;
6726 	struct tog_tree_view_state *s = &view->state.tree;
6727 	struct tog_view *log_view, *ref_view;
6728 	struct got_tree_entry *te;
6729 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6730 
6731 	switch (ch) {
6732 	case 'i':
6733 		s->show_ids = !s->show_ids;
6734 		view->count = 0;
6735 		break;
6736 	case 'l':
6737 		view->count = 0;
6738 		if (!s->selected_entry)
6739 			break;
6740 		if (view_is_parent_view(view))
6741 			view_get_split(view, &begin_y, &begin_x);
6742 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6743 		if (view_is_parent_view(view) &&
6744 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6745 			err = view_init_hsplit(view, begin_y);
6746 			if (err)
6747 				break;
6748 		}
6749 		view->focussed = 0;
6750 		log_view->focussed = 1;
6751 		log_view->mode = view->mode;
6752 		log_view->nlines = view->lines - begin_y;
6753 		if (view_is_parent_view(view)) {
6754 			view_transfer_size(log_view, view);
6755 			err = view_close_child(view);
6756 			if (err)
6757 				return err;
6758 			err = view_set_child(view, log_view);
6759 			if (err)
6760 				return err;
6761 			view->focus_child = 1;
6762 		} else
6763 			*new_view = log_view;
6764 		break;
6765 	case 'r':
6766 		view->count = 0;
6767 		if (view_is_parent_view(view))
6768 			view_get_split(view, &begin_y, &begin_x);
6769 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6770 		if (ref_view == NULL)
6771 			return got_error_from_errno("view_open");
6772 		err = open_ref_view(ref_view, s->repo);
6773 		if (err) {
6774 			view_close(ref_view);
6775 			return err;
6776 		}
6777 		if (view_is_parent_view(view) &&
6778 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6779 			err = view_init_hsplit(view, begin_y);
6780 			if (err)
6781 				break;
6782 		}
6783 		view->focussed = 0;
6784 		ref_view->focussed = 1;
6785 		ref_view->mode = view->mode;
6786 		ref_view->nlines = view->lines - begin_y;
6787 		if (view_is_parent_view(view)) {
6788 			view_transfer_size(ref_view, view);
6789 			err = view_close_child(view);
6790 			if (err)
6791 				return err;
6792 			err = view_set_child(view, ref_view);
6793 			if (err)
6794 				return err;
6795 			view->focus_child = 1;
6796 		} else
6797 			*new_view = ref_view;
6798 		break;
6799 	case 'g':
6800 	case KEY_HOME:
6801 		s->selected = 0;
6802 		view->count = 0;
6803 		if (s->tree == s->root)
6804 			s->first_displayed_entry =
6805 			    got_object_tree_get_first_entry(s->tree);
6806 		else
6807 			s->first_displayed_entry = NULL;
6808 		break;
6809 	case 'G':
6810 	case KEY_END: {
6811 		int eos = view->nlines - 3;
6812 
6813 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6814 			--eos;  /* border */
6815 		s->selected = 0;
6816 		view->count = 0;
6817 		te = got_object_tree_get_last_entry(s->tree);
6818 		for (n = 0; n < eos; n++) {
6819 			if (te == NULL) {
6820 				if (s->tree != s->root) {
6821 					s->first_displayed_entry = NULL;
6822 					n++;
6823 				}
6824 				break;
6825 			}
6826 			s->first_displayed_entry = te;
6827 			te = got_tree_entry_get_prev(s->tree, te);
6828 		}
6829 		if (n > 0)
6830 			s->selected = n - 1;
6831 		break;
6832 	}
6833 	case 'k':
6834 	case KEY_UP:
6835 	case CTRL('p'):
6836 		if (s->selected > 0) {
6837 			s->selected--;
6838 			break;
6839 		}
6840 		tree_scroll_up(s, 1);
6841 		if (s->selected_entry == NULL ||
6842 		    (s->tree == s->root && s->selected_entry ==
6843 		     got_object_tree_get_first_entry(s->tree)))
6844 			view->count = 0;
6845 		break;
6846 	case CTRL('u'):
6847 	case 'u':
6848 		nscroll /= 2;
6849 		/* FALL THROUGH */
6850 	case KEY_PPAGE:
6851 	case CTRL('b'):
6852 	case 'b':
6853 		if (s->tree == s->root) {
6854 			if (got_object_tree_get_first_entry(s->tree) ==
6855 			    s->first_displayed_entry)
6856 				s->selected -= MIN(s->selected, nscroll);
6857 		} else {
6858 			if (s->first_displayed_entry == NULL)
6859 				s->selected -= MIN(s->selected, nscroll);
6860 		}
6861 		tree_scroll_up(s, MAX(0, nscroll));
6862 		if (s->selected_entry == NULL ||
6863 		    (s->tree == s->root && s->selected_entry ==
6864 		     got_object_tree_get_first_entry(s->tree)))
6865 			view->count = 0;
6866 		break;
6867 	case 'j':
6868 	case KEY_DOWN:
6869 	case CTRL('n'):
6870 		if (s->selected < s->ndisplayed - 1) {
6871 			s->selected++;
6872 			break;
6873 		}
6874 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6875 		    == NULL) {
6876 			/* can't scroll any further */
6877 			view->count = 0;
6878 			break;
6879 		}
6880 		tree_scroll_down(view, 1);
6881 		break;
6882 	case CTRL('d'):
6883 	case 'd':
6884 		nscroll /= 2;
6885 		/* FALL THROUGH */
6886 	case KEY_NPAGE:
6887 	case CTRL('f'):
6888 	case 'f':
6889 	case ' ':
6890 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6891 		    == NULL) {
6892 			/* can't scroll any further; move cursor down */
6893 			if (s->selected < s->ndisplayed - 1)
6894 				s->selected += MIN(nscroll,
6895 				    s->ndisplayed - s->selected - 1);
6896 			else
6897 				view->count = 0;
6898 			break;
6899 		}
6900 		tree_scroll_down(view, nscroll);
6901 		break;
6902 	case KEY_ENTER:
6903 	case '\r':
6904 	case KEY_BACKSPACE:
6905 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6906 			struct tog_parent_tree *parent;
6907 			/* user selected '..' */
6908 			if (s->tree == s->root) {
6909 				view->count = 0;
6910 				break;
6911 			}
6912 			parent = TAILQ_FIRST(&s->parents);
6913 			TAILQ_REMOVE(&s->parents, parent,
6914 			    entry);
6915 			got_object_tree_close(s->tree);
6916 			s->tree = parent->tree;
6917 			s->first_displayed_entry =
6918 			    parent->first_displayed_entry;
6919 			s->selected_entry =
6920 			    parent->selected_entry;
6921 			s->selected = parent->selected;
6922 			if (s->selected > view->nlines - 3) {
6923 				err = offset_selection_down(view);
6924 				if (err)
6925 					break;
6926 			}
6927 			free(parent);
6928 		} else if (S_ISDIR(got_tree_entry_get_mode(
6929 		    s->selected_entry))) {
6930 			struct got_tree_object *subtree;
6931 			view->count = 0;
6932 			err = got_object_open_as_tree(&subtree, s->repo,
6933 			    got_tree_entry_get_id(s->selected_entry));
6934 			if (err)
6935 				break;
6936 			err = tree_view_visit_subtree(s, subtree);
6937 			if (err) {
6938 				got_object_tree_close(subtree);
6939 				break;
6940 			}
6941 		} else if (S_ISREG(got_tree_entry_get_mode(
6942 		    s->selected_entry))) {
6943 			struct tog_view *blame_view;
6944 			int begin_x = 0, begin_y = 0;
6945 
6946 			if (view_is_parent_view(view))
6947 				view_get_split(view, &begin_y, &begin_x);
6948 
6949 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6950 			    s->selected_entry, &s->parents,
6951 			    s->commit_id, s->repo);
6952 			if (err)
6953 				break;
6954 
6955 			if (view_is_parent_view(view) &&
6956 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
6957 				err = view_init_hsplit(view, begin_y);
6958 				if (err)
6959 					break;
6960 			}
6961 
6962 			view->count = 0;
6963 			view->focussed = 0;
6964 			blame_view->focussed = 1;
6965 			blame_view->mode = view->mode;
6966 			blame_view->nlines = view->lines - begin_y;
6967 			if (view_is_parent_view(view)) {
6968 				view_transfer_size(blame_view, view);
6969 				err = view_close_child(view);
6970 				if (err)
6971 					return err;
6972 				err = view_set_child(view, blame_view);
6973 				if (err)
6974 					return err;
6975 				view->focus_child = 1;
6976 			} else
6977 				*new_view = blame_view;
6978 		}
6979 		break;
6980 	case KEY_RESIZE:
6981 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6982 			s->selected = view->nlines - 4;
6983 		view->count = 0;
6984 		break;
6985 	default:
6986 		view->count = 0;
6987 		break;
6988 	}
6989 
6990 	return err;
6991 }
6992 
6993 __dead static void
6994 usage_tree(void)
6995 {
6996 	endwin();
6997 	fprintf(stderr,
6998 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6999 	    getprogname());
7000 	exit(1);
7001 }
7002 
7003 static const struct got_error *
7004 cmd_tree(int argc, char *argv[])
7005 {
7006 	const struct got_error *error;
7007 	struct got_repository *repo = NULL;
7008 	struct got_worktree *worktree = NULL;
7009 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7010 	struct got_object_id *commit_id = NULL;
7011 	struct got_commit_object *commit = NULL;
7012 	const char *commit_id_arg = NULL;
7013 	char *label = NULL;
7014 	struct got_reference *ref = NULL;
7015 	const char *head_ref_name = NULL;
7016 	int ch;
7017 	struct tog_view *view;
7018 	int *pack_fds = NULL;
7019 
7020 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7021 		switch (ch) {
7022 		case 'c':
7023 			commit_id_arg = optarg;
7024 			break;
7025 		case 'r':
7026 			repo_path = realpath(optarg, NULL);
7027 			if (repo_path == NULL)
7028 				return got_error_from_errno2("realpath",
7029 				    optarg);
7030 			break;
7031 		default:
7032 			usage_tree();
7033 			/* NOTREACHED */
7034 		}
7035 	}
7036 
7037 	argc -= optind;
7038 	argv += optind;
7039 
7040 	if (argc > 1)
7041 		usage_tree();
7042 
7043 	error = got_repo_pack_fds_open(&pack_fds);
7044 	if (error != NULL)
7045 		goto done;
7046 
7047 	if (repo_path == NULL) {
7048 		cwd = getcwd(NULL, 0);
7049 		if (cwd == NULL)
7050 			return got_error_from_errno("getcwd");
7051 		error = got_worktree_open(&worktree, cwd);
7052 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7053 			goto done;
7054 		if (worktree)
7055 			repo_path =
7056 			    strdup(got_worktree_get_repo_path(worktree));
7057 		else
7058 			repo_path = strdup(cwd);
7059 		if (repo_path == NULL) {
7060 			error = got_error_from_errno("strdup");
7061 			goto done;
7062 		}
7063 	}
7064 
7065 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7066 	if (error != NULL)
7067 		goto done;
7068 
7069 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7070 	    repo, worktree);
7071 	if (error)
7072 		goto done;
7073 
7074 	init_curses();
7075 
7076 	error = apply_unveil(got_repo_get_path(repo), NULL);
7077 	if (error)
7078 		goto done;
7079 
7080 	error = tog_load_refs(repo, 0);
7081 	if (error)
7082 		goto done;
7083 
7084 	if (commit_id_arg == NULL) {
7085 		error = got_repo_match_object_id(&commit_id, &label,
7086 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7087 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7088 		if (error)
7089 			goto done;
7090 		head_ref_name = label;
7091 	} else {
7092 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7093 		if (error == NULL)
7094 			head_ref_name = got_ref_get_name(ref);
7095 		else if (error->code != GOT_ERR_NOT_REF)
7096 			goto done;
7097 		error = got_repo_match_object_id(&commit_id, NULL,
7098 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7099 		if (error)
7100 			goto done;
7101 	}
7102 
7103 	error = got_object_open_as_commit(&commit, repo, commit_id);
7104 	if (error)
7105 		goto done;
7106 
7107 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7108 	if (view == NULL) {
7109 		error = got_error_from_errno("view_open");
7110 		goto done;
7111 	}
7112 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7113 	if (error)
7114 		goto done;
7115 	if (!got_path_is_root_dir(in_repo_path)) {
7116 		error = tree_view_walk_path(&view->state.tree, commit,
7117 		    in_repo_path);
7118 		if (error)
7119 			goto done;
7120 	}
7121 
7122 	if (worktree) {
7123 		/* Release work tree lock. */
7124 		got_worktree_close(worktree);
7125 		worktree = NULL;
7126 	}
7127 	error = view_loop(view);
7128 done:
7129 	free(repo_path);
7130 	free(cwd);
7131 	free(commit_id);
7132 	free(label);
7133 	if (ref)
7134 		got_ref_close(ref);
7135 	if (repo) {
7136 		const struct got_error *close_err = got_repo_close(repo);
7137 		if (error == NULL)
7138 			error = close_err;
7139 	}
7140 	if (pack_fds) {
7141 		const struct got_error *pack_err =
7142 		    got_repo_pack_fds_close(pack_fds);
7143 		if (error == NULL)
7144 			error = pack_err;
7145 	}
7146 	tog_free_refs();
7147 	return error;
7148 }
7149 
7150 static const struct got_error *
7151 ref_view_load_refs(struct tog_ref_view_state *s)
7152 {
7153 	struct got_reflist_entry *sre;
7154 	struct tog_reflist_entry *re;
7155 
7156 	s->nrefs = 0;
7157 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7158 		if (strncmp(got_ref_get_name(sre->ref),
7159 		    "refs/got/", 9) == 0 &&
7160 		    strncmp(got_ref_get_name(sre->ref),
7161 		    "refs/got/backup/", 16) != 0)
7162 			continue;
7163 
7164 		re = malloc(sizeof(*re));
7165 		if (re == NULL)
7166 			return got_error_from_errno("malloc");
7167 
7168 		re->ref = got_ref_dup(sre->ref);
7169 		if (re->ref == NULL)
7170 			return got_error_from_errno("got_ref_dup");
7171 		re->idx = s->nrefs++;
7172 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7173 	}
7174 
7175 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7176 	return NULL;
7177 }
7178 
7179 static void
7180 ref_view_free_refs(struct tog_ref_view_state *s)
7181 {
7182 	struct tog_reflist_entry *re;
7183 
7184 	while (!TAILQ_EMPTY(&s->refs)) {
7185 		re = TAILQ_FIRST(&s->refs);
7186 		TAILQ_REMOVE(&s->refs, re, entry);
7187 		got_ref_close(re->ref);
7188 		free(re);
7189 	}
7190 }
7191 
7192 static const struct got_error *
7193 open_ref_view(struct tog_view *view, struct got_repository *repo)
7194 {
7195 	const struct got_error *err = NULL;
7196 	struct tog_ref_view_state *s = &view->state.ref;
7197 
7198 	s->selected_entry = 0;
7199 	s->repo = repo;
7200 
7201 	TAILQ_INIT(&s->refs);
7202 	STAILQ_INIT(&s->colors);
7203 
7204 	err = ref_view_load_refs(s);
7205 	if (err)
7206 		return err;
7207 
7208 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7209 		err = add_color(&s->colors, "^refs/heads/",
7210 		    TOG_COLOR_REFS_HEADS,
7211 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7212 		if (err)
7213 			goto done;
7214 
7215 		err = add_color(&s->colors, "^refs/tags/",
7216 		    TOG_COLOR_REFS_TAGS,
7217 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7218 		if (err)
7219 			goto done;
7220 
7221 		err = add_color(&s->colors, "^refs/remotes/",
7222 		    TOG_COLOR_REFS_REMOTES,
7223 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7224 		if (err)
7225 			goto done;
7226 
7227 		err = add_color(&s->colors, "^refs/got/backup/",
7228 		    TOG_COLOR_REFS_BACKUP,
7229 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7230 		if (err)
7231 			goto done;
7232 	}
7233 
7234 	view->show = show_ref_view;
7235 	view->input = input_ref_view;
7236 	view->close = close_ref_view;
7237 	view->search_start = search_start_ref_view;
7238 	view->search_next = search_next_ref_view;
7239 done:
7240 	if (err)
7241 		free_colors(&s->colors);
7242 	return err;
7243 }
7244 
7245 static const struct got_error *
7246 close_ref_view(struct tog_view *view)
7247 {
7248 	struct tog_ref_view_state *s = &view->state.ref;
7249 
7250 	ref_view_free_refs(s);
7251 	free_colors(&s->colors);
7252 
7253 	return NULL;
7254 }
7255 
7256 static const struct got_error *
7257 resolve_reflist_entry(struct got_object_id **commit_id,
7258     struct tog_reflist_entry *re, struct got_repository *repo)
7259 {
7260 	const struct got_error *err = NULL;
7261 	struct got_object_id *obj_id;
7262 	struct got_tag_object *tag = NULL;
7263 	int obj_type;
7264 
7265 	*commit_id = NULL;
7266 
7267 	err = got_ref_resolve(&obj_id, repo, re->ref);
7268 	if (err)
7269 		return err;
7270 
7271 	err = got_object_get_type(&obj_type, repo, obj_id);
7272 	if (err)
7273 		goto done;
7274 
7275 	switch (obj_type) {
7276 	case GOT_OBJ_TYPE_COMMIT:
7277 		*commit_id = obj_id;
7278 		break;
7279 	case GOT_OBJ_TYPE_TAG:
7280 		err = got_object_open_as_tag(&tag, repo, obj_id);
7281 		if (err)
7282 			goto done;
7283 		free(obj_id);
7284 		err = got_object_get_type(&obj_type, repo,
7285 		    got_object_tag_get_object_id(tag));
7286 		if (err)
7287 			goto done;
7288 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7289 			err = got_error(GOT_ERR_OBJ_TYPE);
7290 			goto done;
7291 		}
7292 		*commit_id = got_object_id_dup(
7293 		    got_object_tag_get_object_id(tag));
7294 		if (*commit_id == NULL) {
7295 			err = got_error_from_errno("got_object_id_dup");
7296 			goto done;
7297 		}
7298 		break;
7299 	default:
7300 		err = got_error(GOT_ERR_OBJ_TYPE);
7301 		break;
7302 	}
7303 
7304 done:
7305 	if (tag)
7306 		got_object_tag_close(tag);
7307 	if (err) {
7308 		free(*commit_id);
7309 		*commit_id = NULL;
7310 	}
7311 	return err;
7312 }
7313 
7314 static const struct got_error *
7315 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7316     struct tog_reflist_entry *re, struct got_repository *repo)
7317 {
7318 	struct tog_view *log_view;
7319 	const struct got_error *err = NULL;
7320 	struct got_object_id *commit_id = NULL;
7321 
7322 	*new_view = NULL;
7323 
7324 	err = resolve_reflist_entry(&commit_id, re, repo);
7325 	if (err) {
7326 		if (err->code != GOT_ERR_OBJ_TYPE)
7327 			return err;
7328 		else
7329 			return NULL;
7330 	}
7331 
7332 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7333 	if (log_view == NULL) {
7334 		err = got_error_from_errno("view_open");
7335 		goto done;
7336 	}
7337 
7338 	err = open_log_view(log_view, commit_id, repo,
7339 	    got_ref_get_name(re->ref), "", 0);
7340 done:
7341 	if (err)
7342 		view_close(log_view);
7343 	else
7344 		*new_view = log_view;
7345 	free(commit_id);
7346 	return err;
7347 }
7348 
7349 static void
7350 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7351 {
7352 	struct tog_reflist_entry *re;
7353 	int i = 0;
7354 
7355 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7356 		return;
7357 
7358 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7359 	while (i++ < maxscroll) {
7360 		if (re == NULL)
7361 			break;
7362 		s->first_displayed_entry = re;
7363 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7364 	}
7365 }
7366 
7367 static const struct got_error *
7368 ref_scroll_down(struct tog_view *view, int maxscroll)
7369 {
7370 	struct tog_ref_view_state *s = &view->state.ref;
7371 	struct tog_reflist_entry *next, *last;
7372 	int n = 0;
7373 
7374 	if (s->first_displayed_entry)
7375 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7376 	else
7377 		next = TAILQ_FIRST(&s->refs);
7378 
7379 	last = s->last_displayed_entry;
7380 	while (next && n++ < maxscroll) {
7381 		if (last)
7382 			last = TAILQ_NEXT(last, entry);
7383 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7384 			s->first_displayed_entry = next;
7385 			next = TAILQ_NEXT(next, entry);
7386 		}
7387 	}
7388 
7389 	return NULL;
7390 }
7391 
7392 static const struct got_error *
7393 search_start_ref_view(struct tog_view *view)
7394 {
7395 	struct tog_ref_view_state *s = &view->state.ref;
7396 
7397 	s->matched_entry = NULL;
7398 	return NULL;
7399 }
7400 
7401 static int
7402 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7403 {
7404 	regmatch_t regmatch;
7405 
7406 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7407 	    0) == 0;
7408 }
7409 
7410 static const struct got_error *
7411 search_next_ref_view(struct tog_view *view)
7412 {
7413 	struct tog_ref_view_state *s = &view->state.ref;
7414 	struct tog_reflist_entry *re = NULL;
7415 
7416 	if (!view->searching) {
7417 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7418 		return NULL;
7419 	}
7420 
7421 	if (s->matched_entry) {
7422 		if (view->searching == TOG_SEARCH_FORWARD) {
7423 			if (s->selected_entry)
7424 				re = TAILQ_NEXT(s->selected_entry, entry);
7425 			else
7426 				re = TAILQ_PREV(s->selected_entry,
7427 				    tog_reflist_head, entry);
7428 		} else {
7429 			if (s->selected_entry == NULL)
7430 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7431 			else
7432 				re = TAILQ_PREV(s->selected_entry,
7433 				    tog_reflist_head, entry);
7434 		}
7435 	} else {
7436 		if (s->selected_entry)
7437 			re = s->selected_entry;
7438 		else if (view->searching == TOG_SEARCH_FORWARD)
7439 			re = TAILQ_FIRST(&s->refs);
7440 		else
7441 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7442 	}
7443 
7444 	while (1) {
7445 		if (re == NULL) {
7446 			if (s->matched_entry == NULL) {
7447 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7448 				return NULL;
7449 			}
7450 			if (view->searching == TOG_SEARCH_FORWARD)
7451 				re = TAILQ_FIRST(&s->refs);
7452 			else
7453 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7454 		}
7455 
7456 		if (match_reflist_entry(re, &view->regex)) {
7457 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7458 			s->matched_entry = re;
7459 			break;
7460 		}
7461 
7462 		if (view->searching == TOG_SEARCH_FORWARD)
7463 			re = TAILQ_NEXT(re, entry);
7464 		else
7465 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7466 	}
7467 
7468 	if (s->matched_entry) {
7469 		s->first_displayed_entry = s->matched_entry;
7470 		s->selected = 0;
7471 	}
7472 
7473 	return NULL;
7474 }
7475 
7476 static const struct got_error *
7477 show_ref_view(struct tog_view *view)
7478 {
7479 	const struct got_error *err = NULL;
7480 	struct tog_ref_view_state *s = &view->state.ref;
7481 	struct tog_reflist_entry *re;
7482 	char *line = NULL;
7483 	wchar_t *wline;
7484 	struct tog_color *tc;
7485 	int width, n;
7486 	int limit = view->nlines;
7487 
7488 	werase(view->window);
7489 
7490 	s->ndisplayed = 0;
7491 	if (view_is_hsplit_top(view))
7492 		--limit;  /* border */
7493 
7494 	if (limit == 0)
7495 		return NULL;
7496 
7497 	re = s->first_displayed_entry;
7498 
7499 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7500 	    s->nrefs) == -1)
7501 		return got_error_from_errno("asprintf");
7502 
7503 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7504 	if (err) {
7505 		free(line);
7506 		return err;
7507 	}
7508 	if (view_needs_focus_indication(view))
7509 		wstandout(view->window);
7510 	waddwstr(view->window, wline);
7511 	if (view_needs_focus_indication(view))
7512 		wstandend(view->window);
7513 	free(wline);
7514 	wline = NULL;
7515 	free(line);
7516 	line = NULL;
7517 	if (width < view->ncols - 1)
7518 		waddch(view->window, '\n');
7519 	if (--limit <= 0)
7520 		return NULL;
7521 
7522 	n = 0;
7523 	while (re && limit > 0) {
7524 		char *line = NULL;
7525 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7526 
7527 		if (s->show_date) {
7528 			struct got_commit_object *ci;
7529 			struct got_tag_object *tag;
7530 			struct got_object_id *id;
7531 			struct tm tm;
7532 			time_t t;
7533 
7534 			err = got_ref_resolve(&id, s->repo, re->ref);
7535 			if (err)
7536 				return err;
7537 			err = got_object_open_as_tag(&tag, s->repo, id);
7538 			if (err) {
7539 				if (err->code != GOT_ERR_OBJ_TYPE) {
7540 					free(id);
7541 					return err;
7542 				}
7543 				err = got_object_open_as_commit(&ci, s->repo,
7544 				    id);
7545 				if (err) {
7546 					free(id);
7547 					return err;
7548 				}
7549 				t = got_object_commit_get_committer_time(ci);
7550 				got_object_commit_close(ci);
7551 			} else {
7552 				t = got_object_tag_get_tagger_time(tag);
7553 				got_object_tag_close(tag);
7554 			}
7555 			free(id);
7556 			if (gmtime_r(&t, &tm) == NULL)
7557 				return got_error_from_errno("gmtime_r");
7558 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7559 				return got_error(GOT_ERR_NO_SPACE);
7560 		}
7561 		if (got_ref_is_symbolic(re->ref)) {
7562 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7563 			    ymd : "", got_ref_get_name(re->ref),
7564 			    got_ref_get_symref_target(re->ref)) == -1)
7565 				return got_error_from_errno("asprintf");
7566 		} else if (s->show_ids) {
7567 			struct got_object_id *id;
7568 			char *id_str;
7569 			err = got_ref_resolve(&id, s->repo, re->ref);
7570 			if (err)
7571 				return err;
7572 			err = got_object_id_str(&id_str, id);
7573 			if (err) {
7574 				free(id);
7575 				return err;
7576 			}
7577 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7578 			    got_ref_get_name(re->ref), id_str) == -1) {
7579 				err = got_error_from_errno("asprintf");
7580 				free(id);
7581 				free(id_str);
7582 				return err;
7583 			}
7584 			free(id);
7585 			free(id_str);
7586 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7587 		    got_ref_get_name(re->ref)) == -1)
7588 			return got_error_from_errno("asprintf");
7589 
7590 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7591 		    0, 0);
7592 		if (err) {
7593 			free(line);
7594 			return err;
7595 		}
7596 		if (n == s->selected) {
7597 			if (view->focussed)
7598 				wstandout(view->window);
7599 			s->selected_entry = re;
7600 		}
7601 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7602 		if (tc)
7603 			wattr_on(view->window,
7604 			    COLOR_PAIR(tc->colorpair), NULL);
7605 		waddwstr(view->window, wline);
7606 		if (tc)
7607 			wattr_off(view->window,
7608 			    COLOR_PAIR(tc->colorpair), NULL);
7609 		if (width < view->ncols - 1)
7610 			waddch(view->window, '\n');
7611 		if (n == s->selected && view->focussed)
7612 			wstandend(view->window);
7613 		free(line);
7614 		free(wline);
7615 		wline = NULL;
7616 		n++;
7617 		s->ndisplayed++;
7618 		s->last_displayed_entry = re;
7619 
7620 		limit--;
7621 		re = TAILQ_NEXT(re, entry);
7622 	}
7623 
7624 	view_border(view);
7625 	return err;
7626 }
7627 
7628 static const struct got_error *
7629 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7630     struct tog_reflist_entry *re, struct got_repository *repo)
7631 {
7632 	const struct got_error *err = NULL;
7633 	struct got_object_id *commit_id = NULL;
7634 	struct tog_view *tree_view;
7635 
7636 	*new_view = NULL;
7637 
7638 	err = resolve_reflist_entry(&commit_id, re, repo);
7639 	if (err) {
7640 		if (err->code != GOT_ERR_OBJ_TYPE)
7641 			return err;
7642 		else
7643 			return NULL;
7644 	}
7645 
7646 
7647 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7648 	if (tree_view == NULL) {
7649 		err = got_error_from_errno("view_open");
7650 		goto done;
7651 	}
7652 
7653 	err = open_tree_view(tree_view, commit_id,
7654 	    got_ref_get_name(re->ref), repo);
7655 	if (err)
7656 		goto done;
7657 
7658 	*new_view = tree_view;
7659 done:
7660 	free(commit_id);
7661 	return err;
7662 }
7663 static const struct got_error *
7664 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7665 {
7666 	const struct got_error *err = NULL;
7667 	struct tog_ref_view_state *s = &view->state.ref;
7668 	struct tog_view *log_view, *tree_view;
7669 	struct tog_reflist_entry *re;
7670 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7671 
7672 	switch (ch) {
7673 	case 'i':
7674 		s->show_ids = !s->show_ids;
7675 		view->count = 0;
7676 		break;
7677 	case 'm':
7678 		s->show_date = !s->show_date;
7679 		view->count = 0;
7680 		break;
7681 	case 'o':
7682 		s->sort_by_date = !s->sort_by_date;
7683 		view->count = 0;
7684 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7685 		    got_ref_cmp_by_commit_timestamp_descending :
7686 		    tog_ref_cmp_by_name, s->repo);
7687 		if (err)
7688 			break;
7689 		got_reflist_object_id_map_free(tog_refs_idmap);
7690 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7691 		    &tog_refs, s->repo);
7692 		if (err)
7693 			break;
7694 		ref_view_free_refs(s);
7695 		err = ref_view_load_refs(s);
7696 		break;
7697 	case KEY_ENTER:
7698 	case '\r':
7699 		view->count = 0;
7700 		if (!s->selected_entry)
7701 			break;
7702 		if (view_is_parent_view(view))
7703 			view_get_split(view, &begin_y, &begin_x);
7704 
7705 		err = log_ref_entry(&log_view, begin_y, begin_x,
7706 		    s->selected_entry, s->repo);
7707 		if (err)
7708 			break;
7709 
7710 		if (view_is_parent_view(view) &&
7711 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7712 			err = view_init_hsplit(view, begin_y);
7713 			if (err)
7714 				break;
7715 		}
7716 
7717 		view->focussed = 0;
7718 		log_view->focussed = 1;
7719 		log_view->mode = view->mode;
7720 		log_view->nlines = view->lines - begin_y;
7721 		if (view_is_parent_view(view)) {
7722 			view_transfer_size(log_view, view);
7723 			err = view_close_child(view);
7724 			if (err)
7725 				return err;
7726 			err = view_set_child(view, log_view);
7727 			if (err)
7728 				return err;
7729 			view->focus_child = 1;
7730 		} else
7731 			*new_view = log_view;
7732 		break;
7733 	case 't':
7734 		view->count = 0;
7735 		if (!s->selected_entry)
7736 			break;
7737 		if (view_is_parent_view(view))
7738 			view_get_split(view, &begin_y, &begin_x);
7739 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7740 		    s->selected_entry, s->repo);
7741 		if (err || tree_view == NULL)
7742 			break;
7743 		if (view_is_parent_view(view) &&
7744 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7745 			err = view_init_hsplit(view, begin_y);
7746 			if (err)
7747 				break;
7748 		}
7749 		view->focussed = 0;
7750 		tree_view->focussed = 1;
7751 		tree_view->mode = view->mode;
7752 		tree_view->nlines = view->lines - begin_y;
7753 		if (view_is_parent_view(view)) {
7754 			view_transfer_size(tree_view, view);
7755 			err = view_close_child(view);
7756 			if (err)
7757 				return err;
7758 			err = view_set_child(view, tree_view);
7759 			if (err)
7760 				return err;
7761 			view->focus_child = 1;
7762 		} else
7763 			*new_view = tree_view;
7764 		break;
7765 	case 'g':
7766 	case KEY_HOME:
7767 		s->selected = 0;
7768 		view->count = 0;
7769 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7770 		break;
7771 	case 'G':
7772 	case KEY_END: {
7773 		int eos = view->nlines - 1;
7774 
7775 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7776 			--eos;  /* border */
7777 		s->selected = 0;
7778 		view->count = 0;
7779 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7780 		for (n = 0; n < eos; n++) {
7781 			if (re == NULL)
7782 				break;
7783 			s->first_displayed_entry = re;
7784 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7785 		}
7786 		if (n > 0)
7787 			s->selected = n - 1;
7788 		break;
7789 	}
7790 	case 'k':
7791 	case KEY_UP:
7792 	case CTRL('p'):
7793 		if (s->selected > 0) {
7794 			s->selected--;
7795 			break;
7796 		}
7797 		ref_scroll_up(s, 1);
7798 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7799 			view->count = 0;
7800 		break;
7801 	case CTRL('u'):
7802 	case 'u':
7803 		nscroll /= 2;
7804 		/* FALL THROUGH */
7805 	case KEY_PPAGE:
7806 	case CTRL('b'):
7807 	case 'b':
7808 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7809 			s->selected -= MIN(nscroll, s->selected);
7810 		ref_scroll_up(s, MAX(0, nscroll));
7811 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7812 			view->count = 0;
7813 		break;
7814 	case 'j':
7815 	case KEY_DOWN:
7816 	case CTRL('n'):
7817 		if (s->selected < s->ndisplayed - 1) {
7818 			s->selected++;
7819 			break;
7820 		}
7821 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7822 			/* can't scroll any further */
7823 			view->count = 0;
7824 			break;
7825 		}
7826 		ref_scroll_down(view, 1);
7827 		break;
7828 	case CTRL('d'):
7829 	case 'd':
7830 		nscroll /= 2;
7831 		/* FALL THROUGH */
7832 	case KEY_NPAGE:
7833 	case CTRL('f'):
7834 	case 'f':
7835 	case ' ':
7836 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7837 			/* can't scroll any further; move cursor down */
7838 			if (s->selected < s->ndisplayed - 1)
7839 				s->selected += MIN(nscroll,
7840 				    s->ndisplayed - s->selected - 1);
7841 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7842 				s->selected += s->ndisplayed - s->selected - 1;
7843 			view->count = 0;
7844 			break;
7845 		}
7846 		ref_scroll_down(view, nscroll);
7847 		break;
7848 	case CTRL('l'):
7849 		view->count = 0;
7850 		tog_free_refs();
7851 		err = tog_load_refs(s->repo, s->sort_by_date);
7852 		if (err)
7853 			break;
7854 		ref_view_free_refs(s);
7855 		err = ref_view_load_refs(s);
7856 		break;
7857 	case KEY_RESIZE:
7858 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7859 			s->selected = view->nlines - 2;
7860 		break;
7861 	default:
7862 		view->count = 0;
7863 		break;
7864 	}
7865 
7866 	return err;
7867 }
7868 
7869 __dead static void
7870 usage_ref(void)
7871 {
7872 	endwin();
7873 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7874 	    getprogname());
7875 	exit(1);
7876 }
7877 
7878 static const struct got_error *
7879 cmd_ref(int argc, char *argv[])
7880 {
7881 	const struct got_error *error;
7882 	struct got_repository *repo = NULL;
7883 	struct got_worktree *worktree = NULL;
7884 	char *cwd = NULL, *repo_path = NULL;
7885 	int ch;
7886 	struct tog_view *view;
7887 	int *pack_fds = NULL;
7888 
7889 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7890 		switch (ch) {
7891 		case 'r':
7892 			repo_path = realpath(optarg, NULL);
7893 			if (repo_path == NULL)
7894 				return got_error_from_errno2("realpath",
7895 				    optarg);
7896 			break;
7897 		default:
7898 			usage_ref();
7899 			/* NOTREACHED */
7900 		}
7901 	}
7902 
7903 	argc -= optind;
7904 	argv += optind;
7905 
7906 	if (argc > 1)
7907 		usage_ref();
7908 
7909 	error = got_repo_pack_fds_open(&pack_fds);
7910 	if (error != NULL)
7911 		goto done;
7912 
7913 	if (repo_path == NULL) {
7914 		cwd = getcwd(NULL, 0);
7915 		if (cwd == NULL)
7916 			return got_error_from_errno("getcwd");
7917 		error = got_worktree_open(&worktree, cwd);
7918 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7919 			goto done;
7920 		if (worktree)
7921 			repo_path =
7922 			    strdup(got_worktree_get_repo_path(worktree));
7923 		else
7924 			repo_path = strdup(cwd);
7925 		if (repo_path == NULL) {
7926 			error = got_error_from_errno("strdup");
7927 			goto done;
7928 		}
7929 	}
7930 
7931 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7932 	if (error != NULL)
7933 		goto done;
7934 
7935 	init_curses();
7936 
7937 	error = apply_unveil(got_repo_get_path(repo), NULL);
7938 	if (error)
7939 		goto done;
7940 
7941 	error = tog_load_refs(repo, 0);
7942 	if (error)
7943 		goto done;
7944 
7945 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7946 	if (view == NULL) {
7947 		error = got_error_from_errno("view_open");
7948 		goto done;
7949 	}
7950 
7951 	error = open_ref_view(view, repo);
7952 	if (error)
7953 		goto done;
7954 
7955 	if (worktree) {
7956 		/* Release work tree lock. */
7957 		got_worktree_close(worktree);
7958 		worktree = NULL;
7959 	}
7960 	error = view_loop(view);
7961 done:
7962 	free(repo_path);
7963 	free(cwd);
7964 	if (repo) {
7965 		const struct got_error *close_err = got_repo_close(repo);
7966 		if (close_err)
7967 			error = close_err;
7968 	}
7969 	if (pack_fds) {
7970 		const struct got_error *pack_err =
7971 		    got_repo_pack_fds_close(pack_fds);
7972 		if (error == NULL)
7973 			error = pack_err;
7974 	}
7975 	tog_free_refs();
7976 	return error;
7977 }
7978 
7979 /*
7980  * If view was scrolled down to move the selected line into view when opening a
7981  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7982  */
7983 static void
7984 offset_selection_up(struct tog_view *view)
7985 {
7986 	switch (view->type) {
7987 	case TOG_VIEW_BLAME: {
7988 		struct tog_blame_view_state *s = &view->state.blame;
7989 		if (s->first_displayed_line == 1) {
7990 			s->selected_line = MAX(s->selected_line - view->offset,
7991 			    1);
7992 			break;
7993 		}
7994 		if (s->first_displayed_line > view->offset)
7995 			s->first_displayed_line -= view->offset;
7996 		else
7997 			s->first_displayed_line = 1;
7998 		s->selected_line += view->offset;
7999 		break;
8000 	}
8001 	case TOG_VIEW_LOG:
8002 		log_scroll_up(&view->state.log, view->offset);
8003 		view->state.log.selected += view->offset;
8004 		break;
8005 	case TOG_VIEW_REF:
8006 		ref_scroll_up(&view->state.ref, view->offset);
8007 		view->state.ref.selected += view->offset;
8008 		break;
8009 	case TOG_VIEW_TREE:
8010 		tree_scroll_up(&view->state.tree, view->offset);
8011 		view->state.tree.selected += view->offset;
8012 		break;
8013 	default:
8014 		break;
8015 	}
8016 
8017 	view->offset = 0;
8018 }
8019 
8020 /*
8021  * If the selected line is in the section of screen covered by the bottom split,
8022  * scroll down offset lines to move it into view and index its new position.
8023  */
8024 static const struct got_error *
8025 offset_selection_down(struct tog_view *view)
8026 {
8027 	const struct got_error	*err = NULL;
8028 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8029 	int			*selected = NULL;
8030 	int			 header, offset;
8031 
8032 	switch (view->type) {
8033 	case TOG_VIEW_BLAME: {
8034 		struct tog_blame_view_state *s = &view->state.blame;
8035 		header = 3;
8036 		scrolld = NULL;
8037 		if (s->selected_line > view->nlines - header) {
8038 			offset = abs(view->nlines - s->selected_line - header);
8039 			s->first_displayed_line += offset;
8040 			s->selected_line -= offset;
8041 			view->offset = offset;
8042 		}
8043 		break;
8044 	}
8045 	case TOG_VIEW_LOG: {
8046 		struct tog_log_view_state *s = &view->state.log;
8047 		scrolld = &log_scroll_down;
8048 		header = view_is_parent_view(view) ? 3 : 2;
8049 		selected = &s->selected;
8050 		break;
8051 	}
8052 	case TOG_VIEW_REF: {
8053 		struct tog_ref_view_state *s = &view->state.ref;
8054 		scrolld = &ref_scroll_down;
8055 		header = 3;
8056 		selected = &s->selected;
8057 		break;
8058 	}
8059 	case TOG_VIEW_TREE: {
8060 		struct tog_tree_view_state *s = &view->state.tree;
8061 		scrolld = &tree_scroll_down;
8062 		header = 5;
8063 		selected = &s->selected;
8064 		break;
8065 	}
8066 	default:
8067 		selected = NULL;
8068 		scrolld = NULL;
8069 		header = 0;
8070 		break;
8071 	}
8072 
8073 	if (selected && *selected > view->nlines - header) {
8074 		offset = abs(view->nlines - *selected - header);
8075 		view->offset = offset;
8076 		if (scrolld && offset) {
8077 			err = scrolld(view, offset);
8078 			*selected -= offset;
8079 		}
8080 	}
8081 
8082 	return err;
8083 }
8084 
8085 static void
8086 list_commands(FILE *fp)
8087 {
8088 	size_t i;
8089 
8090 	fprintf(fp, "commands:");
8091 	for (i = 0; i < nitems(tog_commands); i++) {
8092 		const struct tog_cmd *cmd = &tog_commands[i];
8093 		fprintf(fp, " %s", cmd->name);
8094 	}
8095 	fputc('\n', fp);
8096 }
8097 
8098 __dead static void
8099 usage(int hflag, int status)
8100 {
8101 	FILE *fp = (status == 0) ? stdout : stderr;
8102 
8103 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8104 	    getprogname());
8105 	if (hflag) {
8106 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8107 		list_commands(fp);
8108 	}
8109 	exit(status);
8110 }
8111 
8112 static char **
8113 make_argv(int argc, ...)
8114 {
8115 	va_list ap;
8116 	char **argv;
8117 	int i;
8118 
8119 	va_start(ap, argc);
8120 
8121 	argv = calloc(argc, sizeof(char *));
8122 	if (argv == NULL)
8123 		err(1, "calloc");
8124 	for (i = 0; i < argc; i++) {
8125 		argv[i] = strdup(va_arg(ap, char *));
8126 		if (argv[i] == NULL)
8127 			err(1, "strdup");
8128 	}
8129 
8130 	va_end(ap);
8131 	return argv;
8132 }
8133 
8134 /*
8135  * Try to convert 'tog path' into a 'tog log path' command.
8136  * The user could simply have mistyped the command rather than knowingly
8137  * provided a path. So check whether argv[0] can in fact be resolved
8138  * to a path in the HEAD commit and print a special error if not.
8139  * This hack is for mpi@ <3
8140  */
8141 static const struct got_error *
8142 tog_log_with_path(int argc, char *argv[])
8143 {
8144 	const struct got_error *error = NULL, *close_err;
8145 	const struct tog_cmd *cmd = NULL;
8146 	struct got_repository *repo = NULL;
8147 	struct got_worktree *worktree = NULL;
8148 	struct got_object_id *commit_id = NULL, *id = NULL;
8149 	struct got_commit_object *commit = NULL;
8150 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8151 	char *commit_id_str = NULL, **cmd_argv = NULL;
8152 	int *pack_fds = NULL;
8153 
8154 	cwd = getcwd(NULL, 0);
8155 	if (cwd == NULL)
8156 		return got_error_from_errno("getcwd");
8157 
8158 	error = got_repo_pack_fds_open(&pack_fds);
8159 	if (error != NULL)
8160 		goto done;
8161 
8162 	error = got_worktree_open(&worktree, cwd);
8163 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8164 		goto done;
8165 
8166 	if (worktree)
8167 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8168 	else
8169 		repo_path = strdup(cwd);
8170 	if (repo_path == NULL) {
8171 		error = got_error_from_errno("strdup");
8172 		goto done;
8173 	}
8174 
8175 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8176 	if (error != NULL)
8177 		goto done;
8178 
8179 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8180 	    repo, worktree);
8181 	if (error)
8182 		goto done;
8183 
8184 	error = tog_load_refs(repo, 0);
8185 	if (error)
8186 		goto done;
8187 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8188 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8189 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8190 	if (error)
8191 		goto done;
8192 
8193 	if (worktree) {
8194 		got_worktree_close(worktree);
8195 		worktree = NULL;
8196 	}
8197 
8198 	error = got_object_open_as_commit(&commit, repo, commit_id);
8199 	if (error)
8200 		goto done;
8201 
8202 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8203 	if (error) {
8204 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8205 			goto done;
8206 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8207 		    getprogname(), argv[0]);
8208 		usage(1, 1);
8209 		/* not reached */
8210 	}
8211 
8212 	close_err = got_repo_close(repo);
8213 	if (error == NULL)
8214 		error = close_err;
8215 	repo = NULL;
8216 
8217 	error = got_object_id_str(&commit_id_str, commit_id);
8218 	if (error)
8219 		goto done;
8220 
8221 	cmd = &tog_commands[0]; /* log */
8222 	argc = 4;
8223 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8224 	error = cmd->cmd_main(argc, cmd_argv);
8225 done:
8226 	if (repo) {
8227 		close_err = got_repo_close(repo);
8228 		if (error == NULL)
8229 			error = close_err;
8230 	}
8231 	if (commit)
8232 		got_object_commit_close(commit);
8233 	if (worktree)
8234 		got_worktree_close(worktree);
8235 	if (pack_fds) {
8236 		const struct got_error *pack_err =
8237 		    got_repo_pack_fds_close(pack_fds);
8238 		if (error == NULL)
8239 			error = pack_err;
8240 	}
8241 	free(id);
8242 	free(commit_id_str);
8243 	free(commit_id);
8244 	free(cwd);
8245 	free(repo_path);
8246 	free(in_repo_path);
8247 	if (cmd_argv) {
8248 		int i;
8249 		for (i = 0; i < argc; i++)
8250 			free(cmd_argv[i]);
8251 		free(cmd_argv);
8252 	}
8253 	tog_free_refs();
8254 	return error;
8255 }
8256 
8257 int
8258 main(int argc, char *argv[])
8259 {
8260 	const struct got_error *error = NULL;
8261 	const struct tog_cmd *cmd = NULL;
8262 	int ch, hflag = 0, Vflag = 0;
8263 	char **cmd_argv = NULL;
8264 	static const struct option longopts[] = {
8265 	    { "version", no_argument, NULL, 'V' },
8266 	    { NULL, 0, NULL, 0}
8267 	};
8268 	char *diff_algo_str = NULL;
8269 
8270 	setlocale(LC_CTYPE, "");
8271 
8272 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8273 		switch (ch) {
8274 		case 'h':
8275 			hflag = 1;
8276 			break;
8277 		case 'V':
8278 			Vflag = 1;
8279 			break;
8280 		default:
8281 			usage(hflag, 1);
8282 			/* NOTREACHED */
8283 		}
8284 	}
8285 
8286 	argc -= optind;
8287 	argv += optind;
8288 	optind = 1;
8289 	optreset = 1;
8290 
8291 	if (Vflag) {
8292 		got_version_print_str();
8293 		return 0;
8294 	}
8295 
8296 #ifndef PROFILE
8297 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8298 	    NULL) == -1)
8299 		err(1, "pledge");
8300 #endif
8301 
8302 	if (argc == 0) {
8303 		if (hflag)
8304 			usage(hflag, 0);
8305 		/* Build an argument vector which runs a default command. */
8306 		cmd = &tog_commands[0];
8307 		argc = 1;
8308 		cmd_argv = make_argv(argc, cmd->name);
8309 	} else {
8310 		size_t i;
8311 
8312 		/* Did the user specify a command? */
8313 		for (i = 0; i < nitems(tog_commands); i++) {
8314 			if (strncmp(tog_commands[i].name, argv[0],
8315 			    strlen(argv[0])) == 0) {
8316 				cmd = &tog_commands[i];
8317 				break;
8318 			}
8319 		}
8320 	}
8321 
8322 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8323 	if (diff_algo_str) {
8324 		if (strcasecmp(diff_algo_str, "patience") == 0)
8325 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8326 		if (strcasecmp(diff_algo_str, "myers") == 0)
8327 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8328 	}
8329 
8330 	if (cmd == NULL) {
8331 		if (argc != 1)
8332 			usage(0, 1);
8333 		/* No command specified; try log with a path */
8334 		error = tog_log_with_path(argc, argv);
8335 	} else {
8336 		if (hflag)
8337 			cmd->cmd_usage();
8338 		else
8339 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8340 	}
8341 
8342 	endwin();
8343 	putchar('\n');
8344 	if (cmd_argv) {
8345 		int i;
8346 		for (i = 0; i < argc; i++)
8347 			free(cmd_argv[i]);
8348 		free(cmd_argv);
8349 	}
8350 
8351 	if (error && error->code != GOT_ERR_CANCELLED)
8352 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8353 	return 0;
8354 }