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 	case 'K':
4835 		up = 1;
4836 		/* FALL THROUGH */
4837 	case '>':
4838 	case '.':
4839 	case 'J':
4840 		if (s->parent_view == NULL) {
4841 			view->count = 0;
4842 			break;
4843 		}
4844 		s->parent_view->count = view->count;
4845 
4846 		if (s->parent_view->type == TOG_VIEW_LOG) {
4847 			ls = &s->parent_view->state.log;
4848 			old_selected_entry = ls->selected_entry;
4849 
4850 			err = input_log_view(NULL, s->parent_view,
4851 			    up ? KEY_UP : KEY_DOWN);
4852 			if (err)
4853 				break;
4854 			view->count = s->parent_view->count;
4855 
4856 			if (old_selected_entry == ls->selected_entry)
4857 				break;
4858 
4859 			err = set_selected_commit(s, ls->selected_entry);
4860 			if (err)
4861 				break;
4862 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4863 			struct tog_blame_view_state *bs;
4864 			struct got_object_id *id, *prev_id;
4865 
4866 			bs = &s->parent_view->state.blame;
4867 			prev_id = get_annotation_for_line(bs->blame.lines,
4868 			    bs->blame.nlines, bs->last_diffed_line);
4869 
4870 			err = input_blame_view(&view, s->parent_view,
4871 			    up ? KEY_UP : KEY_DOWN);
4872 			if (err)
4873 				break;
4874 			view->count = s->parent_view->count;
4875 
4876 			if (prev_id == NULL)
4877 				break;
4878 			id = get_selected_commit_id(bs->blame.lines,
4879 			    bs->blame.nlines, bs->first_displayed_line,
4880 			    bs->selected_line);
4881 			if (id == NULL)
4882 				break;
4883 
4884 			if (!got_object_id_cmp(prev_id, id))
4885 				break;
4886 
4887 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4888 			if (err)
4889 				break;
4890 		}
4891 		s->first_displayed_line = 1;
4892 		s->last_displayed_line = view->nlines;
4893 		s->matched_line = 0;
4894 		view->x = 0;
4895 
4896 		diff_view_indicate_progress(view);
4897 		err = create_diff(s);
4898 		break;
4899 	default:
4900 		view->count = 0;
4901 		break;
4902 	}
4903 
4904 	return err;
4905 }
4906 
4907 static const struct got_error *
4908 cmd_diff(int argc, char *argv[])
4909 {
4910 	const struct got_error *error = NULL;
4911 	struct got_repository *repo = NULL;
4912 	struct got_worktree *worktree = NULL;
4913 	struct got_object_id *id1 = NULL, *id2 = NULL;
4914 	char *repo_path = NULL, *cwd = NULL;
4915 	char *id_str1 = NULL, *id_str2 = NULL;
4916 	char *label1 = NULL, *label2 = NULL;
4917 	int diff_context = 3, ignore_whitespace = 0;
4918 	int ch, force_text_diff = 0;
4919 	const char *errstr;
4920 	struct tog_view *view;
4921 	int *pack_fds = NULL;
4922 
4923 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4924 		switch (ch) {
4925 		case 'a':
4926 			force_text_diff = 1;
4927 			break;
4928 		case 'C':
4929 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4930 			    &errstr);
4931 			if (errstr != NULL)
4932 				errx(1, "number of context lines is %s: %s",
4933 				    errstr, errstr);
4934 			break;
4935 		case 'r':
4936 			repo_path = realpath(optarg, NULL);
4937 			if (repo_path == NULL)
4938 				return got_error_from_errno2("realpath",
4939 				    optarg);
4940 			got_path_strip_trailing_slashes(repo_path);
4941 			break;
4942 		case 'w':
4943 			ignore_whitespace = 1;
4944 			break;
4945 		default:
4946 			usage_diff();
4947 			/* NOTREACHED */
4948 		}
4949 	}
4950 
4951 	argc -= optind;
4952 	argv += optind;
4953 
4954 	if (argc == 0) {
4955 		usage_diff(); /* TODO show local worktree changes */
4956 	} else if (argc == 2) {
4957 		id_str1 = argv[0];
4958 		id_str2 = argv[1];
4959 	} else
4960 		usage_diff();
4961 
4962 	error = got_repo_pack_fds_open(&pack_fds);
4963 	if (error)
4964 		goto done;
4965 
4966 	if (repo_path == NULL) {
4967 		cwd = getcwd(NULL, 0);
4968 		if (cwd == NULL)
4969 			return got_error_from_errno("getcwd");
4970 		error = got_worktree_open(&worktree, cwd);
4971 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4972 			goto done;
4973 		if (worktree)
4974 			repo_path =
4975 			    strdup(got_worktree_get_repo_path(worktree));
4976 		else
4977 			repo_path = strdup(cwd);
4978 		if (repo_path == NULL) {
4979 			error = got_error_from_errno("strdup");
4980 			goto done;
4981 		}
4982 	}
4983 
4984 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4985 	if (error)
4986 		goto done;
4987 
4988 	init_curses();
4989 
4990 	error = apply_unveil(got_repo_get_path(repo), NULL);
4991 	if (error)
4992 		goto done;
4993 
4994 	error = tog_load_refs(repo, 0);
4995 	if (error)
4996 		goto done;
4997 
4998 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4999 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5000 	if (error)
5001 		goto done;
5002 
5003 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5004 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5005 	if (error)
5006 		goto done;
5007 
5008 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5009 	if (view == NULL) {
5010 		error = got_error_from_errno("view_open");
5011 		goto done;
5012 	}
5013 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5014 	    ignore_whitespace, force_text_diff, NULL,  repo);
5015 	if (error)
5016 		goto done;
5017 	error = view_loop(view);
5018 done:
5019 	free(label1);
5020 	free(label2);
5021 	free(repo_path);
5022 	free(cwd);
5023 	if (repo) {
5024 		const struct got_error *close_err = got_repo_close(repo);
5025 		if (error == NULL)
5026 			error = close_err;
5027 	}
5028 	if (worktree)
5029 		got_worktree_close(worktree);
5030 	if (pack_fds) {
5031 		const struct got_error *pack_err =
5032 		    got_repo_pack_fds_close(pack_fds);
5033 		if (error == NULL)
5034 			error = pack_err;
5035 	}
5036 	tog_free_refs();
5037 	return error;
5038 }
5039 
5040 __dead static void
5041 usage_blame(void)
5042 {
5043 	endwin();
5044 	fprintf(stderr,
5045 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5046 	    getprogname());
5047 	exit(1);
5048 }
5049 
5050 struct tog_blame_line {
5051 	int annotated;
5052 	struct got_object_id *id;
5053 };
5054 
5055 static const struct got_error *
5056 draw_blame(struct tog_view *view)
5057 {
5058 	struct tog_blame_view_state *s = &view->state.blame;
5059 	struct tog_blame *blame = &s->blame;
5060 	regmatch_t *regmatch = &view->regmatch;
5061 	const struct got_error *err;
5062 	int lineno = 0, nprinted = 0;
5063 	char *line = NULL;
5064 	size_t linesize = 0;
5065 	ssize_t linelen;
5066 	wchar_t *wline;
5067 	int width;
5068 	struct tog_blame_line *blame_line;
5069 	struct got_object_id *prev_id = NULL;
5070 	char *id_str;
5071 	struct tog_color *tc;
5072 
5073 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5074 	if (err)
5075 		return err;
5076 
5077 	rewind(blame->f);
5078 	werase(view->window);
5079 
5080 	if (asprintf(&line, "commit %s", id_str) == -1) {
5081 		err = got_error_from_errno("asprintf");
5082 		free(id_str);
5083 		return err;
5084 	}
5085 
5086 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5087 	free(line);
5088 	line = NULL;
5089 	if (err)
5090 		return err;
5091 	if (view_needs_focus_indication(view))
5092 		wstandout(view->window);
5093 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5094 	if (tc)
5095 		wattr_on(view->window,
5096 		    COLOR_PAIR(tc->colorpair), NULL);
5097 	waddwstr(view->window, wline);
5098 	if (tc)
5099 		wattr_off(view->window,
5100 		    COLOR_PAIR(tc->colorpair), NULL);
5101 	if (view_needs_focus_indication(view))
5102 		wstandend(view->window);
5103 	free(wline);
5104 	wline = NULL;
5105 	if (width < view->ncols - 1)
5106 		waddch(view->window, '\n');
5107 
5108 	if (asprintf(&line, "[%d/%d] %s%s",
5109 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5110 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5111 		free(id_str);
5112 		return got_error_from_errno("asprintf");
5113 	}
5114 	free(id_str);
5115 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5116 	free(line);
5117 	line = NULL;
5118 	if (err)
5119 		return err;
5120 	waddwstr(view->window, wline);
5121 	free(wline);
5122 	wline = NULL;
5123 	if (width < view->ncols - 1)
5124 		waddch(view->window, '\n');
5125 
5126 	s->eof = 0;
5127 	view->maxx = 0;
5128 	while (nprinted < view->nlines - 2) {
5129 		linelen = getline(&line, &linesize, blame->f);
5130 		if (linelen == -1) {
5131 			if (feof(blame->f)) {
5132 				s->eof = 1;
5133 				break;
5134 			}
5135 			free(line);
5136 			return got_ferror(blame->f, GOT_ERR_IO);
5137 		}
5138 		if (++lineno < s->first_displayed_line)
5139 			continue;
5140 
5141 		/* Set view->maxx based on full line length. */
5142 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5143 		if (err) {
5144 			free(line);
5145 			return err;
5146 		}
5147 		free(wline);
5148 		wline = NULL;
5149 		view->maxx = MAX(view->maxx, width);
5150 
5151 		if (nprinted == s->selected_line - 1)
5152 			wstandout(view->window);
5153 
5154 		if (blame->nlines > 0) {
5155 			blame_line = &blame->lines[lineno - 1];
5156 			if (blame_line->annotated && prev_id &&
5157 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5158 			    !(nprinted == s->selected_line - 1)) {
5159 				waddstr(view->window, "        ");
5160 			} else if (blame_line->annotated) {
5161 				char *id_str;
5162 				err = got_object_id_str(&id_str,
5163 				    blame_line->id);
5164 				if (err) {
5165 					free(line);
5166 					return err;
5167 				}
5168 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5169 				if (tc)
5170 					wattr_on(view->window,
5171 					    COLOR_PAIR(tc->colorpair), NULL);
5172 				wprintw(view->window, "%.8s", id_str);
5173 				if (tc)
5174 					wattr_off(view->window,
5175 					    COLOR_PAIR(tc->colorpair), NULL);
5176 				free(id_str);
5177 				prev_id = blame_line->id;
5178 			} else {
5179 				waddstr(view->window, "........");
5180 				prev_id = NULL;
5181 			}
5182 		} else {
5183 			waddstr(view->window, "........");
5184 			prev_id = NULL;
5185 		}
5186 
5187 		if (nprinted == s->selected_line - 1)
5188 			wstandend(view->window);
5189 		waddstr(view->window, " ");
5190 
5191 		if (view->ncols <= 9) {
5192 			width = 9;
5193 		} else if (s->first_displayed_line + nprinted ==
5194 		    s->matched_line &&
5195 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5196 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5197 			    view->window, view->x, regmatch);
5198 			if (err) {
5199 				free(line);
5200 				return err;
5201 			}
5202 			width += 9;
5203 		} else {
5204 			int skip;
5205 			err = format_line(&wline, &width, &skip, line,
5206 			    view->x, view->ncols - 9, 9, 1);
5207 			if (err) {
5208 				free(line);
5209 				return err;
5210 			}
5211 			waddwstr(view->window, &wline[skip]);
5212 			width += 9;
5213 			free(wline);
5214 			wline = NULL;
5215 		}
5216 
5217 		if (width <= view->ncols - 1)
5218 			waddch(view->window, '\n');
5219 		if (++nprinted == 1)
5220 			s->first_displayed_line = lineno;
5221 	}
5222 	free(line);
5223 	s->last_displayed_line = lineno;
5224 
5225 	view_border(view);
5226 
5227 	return NULL;
5228 }
5229 
5230 static const struct got_error *
5231 blame_cb(void *arg, int nlines, int lineno,
5232     struct got_commit_object *commit, struct got_object_id *id)
5233 {
5234 	const struct got_error *err = NULL;
5235 	struct tog_blame_cb_args *a = arg;
5236 	struct tog_blame_line *line;
5237 	int errcode;
5238 
5239 	if (nlines != a->nlines ||
5240 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5241 		return got_error(GOT_ERR_RANGE);
5242 
5243 	errcode = pthread_mutex_lock(&tog_mutex);
5244 	if (errcode)
5245 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5246 
5247 	if (*a->quit) {	/* user has quit the blame view */
5248 		err = got_error(GOT_ERR_ITER_COMPLETED);
5249 		goto done;
5250 	}
5251 
5252 	if (lineno == -1)
5253 		goto done; /* no change in this commit */
5254 
5255 	line = &a->lines[lineno - 1];
5256 	if (line->annotated)
5257 		goto done;
5258 
5259 	line->id = got_object_id_dup(id);
5260 	if (line->id == NULL) {
5261 		err = got_error_from_errno("got_object_id_dup");
5262 		goto done;
5263 	}
5264 	line->annotated = 1;
5265 done:
5266 	errcode = pthread_mutex_unlock(&tog_mutex);
5267 	if (errcode)
5268 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5269 	return err;
5270 }
5271 
5272 static void *
5273 blame_thread(void *arg)
5274 {
5275 	const struct got_error *err, *close_err;
5276 	struct tog_blame_thread_args *ta = arg;
5277 	struct tog_blame_cb_args *a = ta->cb_args;
5278 	int errcode, fd1 = -1, fd2 = -1;
5279 	FILE *f1 = NULL, *f2 = NULL;
5280 
5281 	fd1 = got_opentempfd();
5282 	if (fd1 == -1)
5283 		return (void *)got_error_from_errno("got_opentempfd");
5284 
5285 	fd2 = got_opentempfd();
5286 	if (fd2 == -1) {
5287 		err = got_error_from_errno("got_opentempfd");
5288 		goto done;
5289 	}
5290 
5291 	f1 = got_opentemp();
5292 	if (f1 == NULL) {
5293 		err = (void *)got_error_from_errno("got_opentemp");
5294 		goto done;
5295 	}
5296 	f2 = got_opentemp();
5297 	if (f2 == NULL) {
5298 		err = (void *)got_error_from_errno("got_opentemp");
5299 		goto done;
5300 	}
5301 
5302 	err = block_signals_used_by_main_thread();
5303 	if (err)
5304 		goto done;
5305 
5306 	err = got_blame(ta->path, a->commit_id, ta->repo,
5307 	    tog_diff_algo, blame_cb, ta->cb_args,
5308 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5309 	if (err && err->code == GOT_ERR_CANCELLED)
5310 		err = NULL;
5311 
5312 	errcode = pthread_mutex_lock(&tog_mutex);
5313 	if (errcode) {
5314 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5315 		goto done;
5316 	}
5317 
5318 	close_err = got_repo_close(ta->repo);
5319 	if (err == NULL)
5320 		err = close_err;
5321 	ta->repo = NULL;
5322 	*ta->complete = 1;
5323 
5324 	errcode = pthread_mutex_unlock(&tog_mutex);
5325 	if (errcode && err == NULL)
5326 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5327 
5328 done:
5329 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5330 		err = got_error_from_errno("close");
5331 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5332 		err = got_error_from_errno("close");
5333 	if (f1 && fclose(f1) == EOF && err == NULL)
5334 		err = got_error_from_errno("fclose");
5335 	if (f2 && fclose(f2) == EOF && err == NULL)
5336 		err = got_error_from_errno("fclose");
5337 
5338 	return (void *)err;
5339 }
5340 
5341 static struct got_object_id *
5342 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5343     int first_displayed_line, int selected_line)
5344 {
5345 	struct tog_blame_line *line;
5346 
5347 	if (nlines <= 0)
5348 		return NULL;
5349 
5350 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5351 	if (!line->annotated)
5352 		return NULL;
5353 
5354 	return line->id;
5355 }
5356 
5357 static struct got_object_id *
5358 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5359     int lineno)
5360 {
5361 	struct tog_blame_line *line;
5362 
5363 	if (nlines <= 0 || lineno >= nlines)
5364 		return NULL;
5365 
5366 	line = &lines[lineno - 1];
5367 	if (!line->annotated)
5368 		return NULL;
5369 
5370 	return line->id;
5371 }
5372 
5373 static const struct got_error *
5374 stop_blame(struct tog_blame *blame)
5375 {
5376 	const struct got_error *err = NULL;
5377 	int i;
5378 
5379 	if (blame->thread) {
5380 		int errcode;
5381 		errcode = pthread_mutex_unlock(&tog_mutex);
5382 		if (errcode)
5383 			return got_error_set_errno(errcode,
5384 			    "pthread_mutex_unlock");
5385 		errcode = pthread_join(blame->thread, (void **)&err);
5386 		if (errcode)
5387 			return got_error_set_errno(errcode, "pthread_join");
5388 		errcode = pthread_mutex_lock(&tog_mutex);
5389 		if (errcode)
5390 			return got_error_set_errno(errcode,
5391 			    "pthread_mutex_lock");
5392 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5393 			err = NULL;
5394 		blame->thread = 0; //NULL;
5395 	}
5396 	if (blame->thread_args.repo) {
5397 		const struct got_error *close_err;
5398 		close_err = got_repo_close(blame->thread_args.repo);
5399 		if (err == NULL)
5400 			err = close_err;
5401 		blame->thread_args.repo = NULL;
5402 	}
5403 	if (blame->f) {
5404 		if (fclose(blame->f) == EOF && err == NULL)
5405 			err = got_error_from_errno("fclose");
5406 		blame->f = NULL;
5407 	}
5408 	if (blame->lines) {
5409 		for (i = 0; i < blame->nlines; i++)
5410 			free(blame->lines[i].id);
5411 		free(blame->lines);
5412 		blame->lines = NULL;
5413 	}
5414 	free(blame->cb_args.commit_id);
5415 	blame->cb_args.commit_id = NULL;
5416 	if (blame->pack_fds) {
5417 		const struct got_error *pack_err =
5418 		    got_repo_pack_fds_close(blame->pack_fds);
5419 		if (err == NULL)
5420 			err = pack_err;
5421 		blame->pack_fds = NULL;
5422 	}
5423 	return err;
5424 }
5425 
5426 static const struct got_error *
5427 cancel_blame_view(void *arg)
5428 {
5429 	const struct got_error *err = NULL;
5430 	int *done = arg;
5431 	int errcode;
5432 
5433 	errcode = pthread_mutex_lock(&tog_mutex);
5434 	if (errcode)
5435 		return got_error_set_errno(errcode,
5436 		    "pthread_mutex_unlock");
5437 
5438 	if (*done)
5439 		err = got_error(GOT_ERR_CANCELLED);
5440 
5441 	errcode = pthread_mutex_unlock(&tog_mutex);
5442 	if (errcode)
5443 		return got_error_set_errno(errcode,
5444 		    "pthread_mutex_lock");
5445 
5446 	return err;
5447 }
5448 
5449 static const struct got_error *
5450 run_blame(struct tog_view *view)
5451 {
5452 	struct tog_blame_view_state *s = &view->state.blame;
5453 	struct tog_blame *blame = &s->blame;
5454 	const struct got_error *err = NULL;
5455 	struct got_commit_object *commit = NULL;
5456 	struct got_blob_object *blob = NULL;
5457 	struct got_repository *thread_repo = NULL;
5458 	struct got_object_id *obj_id = NULL;
5459 	int obj_type, fd = -1;
5460 	int *pack_fds = NULL;
5461 
5462 	err = got_object_open_as_commit(&commit, s->repo,
5463 	    &s->blamed_commit->id);
5464 	if (err)
5465 		return err;
5466 
5467 	fd = got_opentempfd();
5468 	if (fd == -1) {
5469 		err = got_error_from_errno("got_opentempfd");
5470 		goto done;
5471 	}
5472 
5473 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5474 	if (err)
5475 		goto done;
5476 
5477 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5478 	if (err)
5479 		goto done;
5480 
5481 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5482 		err = got_error(GOT_ERR_OBJ_TYPE);
5483 		goto done;
5484 	}
5485 
5486 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5487 	if (err)
5488 		goto done;
5489 	blame->f = got_opentemp();
5490 	if (blame->f == NULL) {
5491 		err = got_error_from_errno("got_opentemp");
5492 		goto done;
5493 	}
5494 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5495 	    &blame->line_offsets, blame->f, blob);
5496 	if (err)
5497 		goto done;
5498 	if (blame->nlines == 0) {
5499 		s->blame_complete = 1;
5500 		goto done;
5501 	}
5502 
5503 	/* Don't include \n at EOF in the blame line count. */
5504 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5505 		blame->nlines--;
5506 
5507 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5508 	if (blame->lines == NULL) {
5509 		err = got_error_from_errno("calloc");
5510 		goto done;
5511 	}
5512 
5513 	err = got_repo_pack_fds_open(&pack_fds);
5514 	if (err)
5515 		goto done;
5516 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5517 	    pack_fds);
5518 	if (err)
5519 		goto done;
5520 
5521 	blame->pack_fds = pack_fds;
5522 	blame->cb_args.view = view;
5523 	blame->cb_args.lines = blame->lines;
5524 	blame->cb_args.nlines = blame->nlines;
5525 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5526 	if (blame->cb_args.commit_id == NULL) {
5527 		err = got_error_from_errno("got_object_id_dup");
5528 		goto done;
5529 	}
5530 	blame->cb_args.quit = &s->done;
5531 
5532 	blame->thread_args.path = s->path;
5533 	blame->thread_args.repo = thread_repo;
5534 	blame->thread_args.cb_args = &blame->cb_args;
5535 	blame->thread_args.complete = &s->blame_complete;
5536 	blame->thread_args.cancel_cb = cancel_blame_view;
5537 	blame->thread_args.cancel_arg = &s->done;
5538 	s->blame_complete = 0;
5539 
5540 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5541 		s->first_displayed_line = 1;
5542 		s->last_displayed_line = view->nlines;
5543 		s->selected_line = 1;
5544 	}
5545 	s->matched_line = 0;
5546 
5547 done:
5548 	if (commit)
5549 		got_object_commit_close(commit);
5550 	if (fd != -1 && close(fd) == -1 && err == NULL)
5551 		err = got_error_from_errno("close");
5552 	if (blob)
5553 		got_object_blob_close(blob);
5554 	free(obj_id);
5555 	if (err)
5556 		stop_blame(blame);
5557 	return err;
5558 }
5559 
5560 static const struct got_error *
5561 open_blame_view(struct tog_view *view, char *path,
5562     struct got_object_id *commit_id, struct got_repository *repo)
5563 {
5564 	const struct got_error *err = NULL;
5565 	struct tog_blame_view_state *s = &view->state.blame;
5566 
5567 	STAILQ_INIT(&s->blamed_commits);
5568 
5569 	s->path = strdup(path);
5570 	if (s->path == NULL)
5571 		return got_error_from_errno("strdup");
5572 
5573 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5574 	if (err) {
5575 		free(s->path);
5576 		return err;
5577 	}
5578 
5579 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5580 	s->first_displayed_line = 1;
5581 	s->last_displayed_line = view->nlines;
5582 	s->selected_line = 1;
5583 	s->blame_complete = 0;
5584 	s->repo = repo;
5585 	s->commit_id = commit_id;
5586 	memset(&s->blame, 0, sizeof(s->blame));
5587 
5588 	STAILQ_INIT(&s->colors);
5589 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5590 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5591 		    get_color_value("TOG_COLOR_COMMIT"));
5592 		if (err)
5593 			return err;
5594 	}
5595 
5596 	view->show = show_blame_view;
5597 	view->input = input_blame_view;
5598 	view->reset = reset_blame_view;
5599 	view->close = close_blame_view;
5600 	view->search_start = search_start_blame_view;
5601 	view->search_next = search_next_blame_view;
5602 
5603 	return run_blame(view);
5604 }
5605 
5606 static const struct got_error *
5607 close_blame_view(struct tog_view *view)
5608 {
5609 	const struct got_error *err = NULL;
5610 	struct tog_blame_view_state *s = &view->state.blame;
5611 
5612 	if (s->blame.thread)
5613 		err = stop_blame(&s->blame);
5614 
5615 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5616 		struct got_object_qid *blamed_commit;
5617 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5618 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5619 		got_object_qid_free(blamed_commit);
5620 	}
5621 
5622 	free(s->path);
5623 	free_colors(&s->colors);
5624 	return err;
5625 }
5626 
5627 static const struct got_error *
5628 search_start_blame_view(struct tog_view *view)
5629 {
5630 	struct tog_blame_view_state *s = &view->state.blame;
5631 
5632 	s->matched_line = 0;
5633 	return NULL;
5634 }
5635 
5636 static const struct got_error *
5637 search_next_blame_view(struct tog_view *view)
5638 {
5639 	struct tog_blame_view_state *s = &view->state.blame;
5640 	const struct got_error *err = NULL;
5641 	int lineno;
5642 	char *line = NULL;
5643 	size_t linesize = 0;
5644 	ssize_t linelen;
5645 
5646 	if (!view->searching) {
5647 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5648 		return NULL;
5649 	}
5650 
5651 	if (s->matched_line) {
5652 		if (view->searching == TOG_SEARCH_FORWARD)
5653 			lineno = s->matched_line + 1;
5654 		else
5655 			lineno = s->matched_line - 1;
5656 	} else
5657 		lineno = s->first_displayed_line - 1 + s->selected_line;
5658 
5659 	while (1) {
5660 		off_t offset;
5661 
5662 		if (lineno <= 0 || lineno > s->blame.nlines) {
5663 			if (s->matched_line == 0) {
5664 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5665 				break;
5666 			}
5667 
5668 			if (view->searching == TOG_SEARCH_FORWARD)
5669 				lineno = 1;
5670 			else
5671 				lineno = s->blame.nlines;
5672 		}
5673 
5674 		offset = s->blame.line_offsets[lineno - 1];
5675 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5676 			free(line);
5677 			return got_error_from_errno("fseeko");
5678 		}
5679 		linelen = getline(&line, &linesize, s->blame.f);
5680 		if (linelen != -1) {
5681 			char *exstr;
5682 			err = expand_tab(&exstr, line);
5683 			if (err)
5684 				break;
5685 			if (match_line(exstr, &view->regex, 1,
5686 			    &view->regmatch)) {
5687 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5688 				s->matched_line = lineno;
5689 				free(exstr);
5690 				break;
5691 			}
5692 			free(exstr);
5693 		}
5694 		if (view->searching == TOG_SEARCH_FORWARD)
5695 			lineno++;
5696 		else
5697 			lineno--;
5698 	}
5699 	free(line);
5700 
5701 	if (s->matched_line) {
5702 		s->first_displayed_line = s->matched_line;
5703 		s->selected_line = 1;
5704 	}
5705 
5706 	return err;
5707 }
5708 
5709 static const struct got_error *
5710 show_blame_view(struct tog_view *view)
5711 {
5712 	const struct got_error *err = NULL;
5713 	struct tog_blame_view_state *s = &view->state.blame;
5714 	int errcode;
5715 
5716 	if (s->blame.thread == 0 && !s->blame_complete) {
5717 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5718 		    &s->blame.thread_args);
5719 		if (errcode)
5720 			return got_error_set_errno(errcode, "pthread_create");
5721 
5722 		halfdelay(1); /* fast refresh while annotating  */
5723 	}
5724 
5725 	if (s->blame_complete)
5726 		halfdelay(10); /* disable fast refresh */
5727 
5728 	err = draw_blame(view);
5729 
5730 	view_border(view);
5731 	return err;
5732 }
5733 
5734 static const struct got_error *
5735 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5736     struct got_repository *repo, struct got_object_id *id)
5737 {
5738 	struct tog_view		*log_view;
5739 	const struct got_error	*err = NULL;
5740 
5741 	*new_view = NULL;
5742 
5743 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5744 	if (log_view == NULL)
5745 		return got_error_from_errno("view_open");
5746 
5747 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5748 	if (err)
5749 		view_close(log_view);
5750 	else
5751 		*new_view = log_view;
5752 
5753 	return err;
5754 }
5755 
5756 static const struct got_error *
5757 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5758 {
5759 	const struct got_error *err = NULL, *thread_err = NULL;
5760 	struct tog_view *diff_view, *log_view;
5761 	struct tog_blame_view_state *s = &view->state.blame;
5762 	int eos, nscroll, begin_y = 0, begin_x = 0;
5763 
5764 	eos = nscroll = view->nlines - 2;
5765 	if (view_is_hsplit_top(view))
5766 		--eos;  /* border */
5767 
5768 	switch (ch) {
5769 	case '0':
5770 		view->x = 0;
5771 		break;
5772 	case '$':
5773 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5774 		view->count = 0;
5775 		break;
5776 	case KEY_RIGHT:
5777 	case 'l':
5778 		if (view->x + view->ncols / 3 < view->maxx)
5779 			view->x += 2;  /* move two columns right */
5780 		else
5781 			view->count = 0;
5782 		break;
5783 	case KEY_LEFT:
5784 	case 'h':
5785 		view->x -= MIN(view->x, 2);  /* move two columns back */
5786 		if (view->x <= 0)
5787 			view->count = 0;
5788 		break;
5789 	case 'q':
5790 		s->done = 1;
5791 		break;
5792 	case 'g':
5793 	case KEY_HOME:
5794 		s->selected_line = 1;
5795 		s->first_displayed_line = 1;
5796 		view->count = 0;
5797 		break;
5798 	case 'G':
5799 	case KEY_END:
5800 		if (s->blame.nlines < eos) {
5801 			s->selected_line = s->blame.nlines;
5802 			s->first_displayed_line = 1;
5803 		} else {
5804 			s->selected_line = eos;
5805 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5806 		}
5807 		view->count = 0;
5808 		break;
5809 	case 'k':
5810 	case KEY_UP:
5811 	case CTRL('p'):
5812 		if (s->selected_line > 1)
5813 			s->selected_line--;
5814 		else if (s->selected_line == 1 &&
5815 		    s->first_displayed_line > 1)
5816 			s->first_displayed_line--;
5817 		else
5818 			view->count = 0;
5819 		break;
5820 	case CTRL('u'):
5821 	case 'u':
5822 		nscroll /= 2;
5823 		/* FALL THROUGH */
5824 	case KEY_PPAGE:
5825 	case CTRL('b'):
5826 	case 'b':
5827 		if (s->first_displayed_line == 1) {
5828 			if (view->count > 1)
5829 				nscroll += nscroll;
5830 			s->selected_line = MAX(1, s->selected_line - nscroll);
5831 			view->count = 0;
5832 			break;
5833 		}
5834 		if (s->first_displayed_line > nscroll)
5835 			s->first_displayed_line -= nscroll;
5836 		else
5837 			s->first_displayed_line = 1;
5838 		break;
5839 	case 'j':
5840 	case KEY_DOWN:
5841 	case CTRL('n'):
5842 		if (s->selected_line < eos && s->first_displayed_line +
5843 		    s->selected_line <= s->blame.nlines)
5844 			s->selected_line++;
5845 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5846 			s->first_displayed_line++;
5847 		else
5848 			view->count = 0;
5849 		break;
5850 	case 'c':
5851 	case 'p': {
5852 		struct got_object_id *id = NULL;
5853 
5854 		view->count = 0;
5855 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5856 		    s->first_displayed_line, s->selected_line);
5857 		if (id == NULL)
5858 			break;
5859 		if (ch == 'p') {
5860 			struct got_commit_object *commit, *pcommit;
5861 			struct got_object_qid *pid;
5862 			struct got_object_id *blob_id = NULL;
5863 			int obj_type;
5864 			err = got_object_open_as_commit(&commit,
5865 			    s->repo, id);
5866 			if (err)
5867 				break;
5868 			pid = STAILQ_FIRST(
5869 			    got_object_commit_get_parent_ids(commit));
5870 			if (pid == NULL) {
5871 				got_object_commit_close(commit);
5872 				break;
5873 			}
5874 			/* Check if path history ends here. */
5875 			err = got_object_open_as_commit(&pcommit,
5876 			    s->repo, &pid->id);
5877 			if (err)
5878 				break;
5879 			err = got_object_id_by_path(&blob_id, s->repo,
5880 			    pcommit, s->path);
5881 			got_object_commit_close(pcommit);
5882 			if (err) {
5883 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5884 					err = NULL;
5885 				got_object_commit_close(commit);
5886 				break;
5887 			}
5888 			err = got_object_get_type(&obj_type, s->repo,
5889 			    blob_id);
5890 			free(blob_id);
5891 			/* Can't blame non-blob type objects. */
5892 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5893 				got_object_commit_close(commit);
5894 				break;
5895 			}
5896 			err = got_object_qid_alloc(&s->blamed_commit,
5897 			    &pid->id);
5898 			got_object_commit_close(commit);
5899 		} else {
5900 			if (got_object_id_cmp(id,
5901 			    &s->blamed_commit->id) == 0)
5902 				break;
5903 			err = got_object_qid_alloc(&s->blamed_commit,
5904 			    id);
5905 		}
5906 		if (err)
5907 			break;
5908 		s->done = 1;
5909 		thread_err = stop_blame(&s->blame);
5910 		s->done = 0;
5911 		if (thread_err)
5912 			break;
5913 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5914 		    s->blamed_commit, entry);
5915 		err = run_blame(view);
5916 		if (err)
5917 			break;
5918 		break;
5919 	}
5920 	case 'C': {
5921 		struct got_object_qid *first;
5922 
5923 		view->count = 0;
5924 		first = STAILQ_FIRST(&s->blamed_commits);
5925 		if (!got_object_id_cmp(&first->id, s->commit_id))
5926 			break;
5927 		s->done = 1;
5928 		thread_err = stop_blame(&s->blame);
5929 		s->done = 0;
5930 		if (thread_err)
5931 			break;
5932 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5933 		got_object_qid_free(s->blamed_commit);
5934 		s->blamed_commit =
5935 		    STAILQ_FIRST(&s->blamed_commits);
5936 		err = run_blame(view);
5937 		if (err)
5938 			break;
5939 		break;
5940 	}
5941 	case 'L': {
5942 		struct got_object_id *id = NULL;
5943 
5944 		view->count = 0;
5945 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5946 		    s->first_displayed_line, s->selected_line);
5947 		if (id == NULL)
5948 			break;
5949 
5950 		if (view_is_parent_view(view))
5951 			view_get_split(view, &begin_y, &begin_x);
5952 		err = log_annotated_line(&log_view, begin_y, begin_x,
5953 		    s->repo, id);
5954 		if (err)
5955 			break;
5956 		if (view_is_parent_view(view) &&
5957 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5958 			err = view_init_hsplit(view, begin_y);
5959 			if (err)
5960 				break;
5961 		}
5962 
5963 		view->focussed = 0;
5964 		log_view->focussed = 1;
5965 		log_view->mode = view->mode;
5966 		log_view->nlines = view->lines - begin_y;
5967 		if (view_is_parent_view(view)) {
5968 			view_transfer_size(log_view, view);
5969 			err = view_close_child(view);
5970 			if (err)
5971 				return err;
5972 			err = view_set_child(view, log_view);
5973 			if (err)
5974 				return err;
5975 			view->focus_child = 1;
5976 		} else
5977 			*new_view = log_view;
5978 		break;
5979 	}
5980 	case KEY_ENTER:
5981 	case '\r': {
5982 		struct got_object_id *id = NULL;
5983 		struct got_object_qid *pid;
5984 		struct got_commit_object *commit = NULL;
5985 
5986 		view->count = 0;
5987 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5988 		    s->first_displayed_line, s->selected_line);
5989 		if (id == NULL)
5990 			break;
5991 		err = got_object_open_as_commit(&commit, s->repo, id);
5992 		if (err)
5993 			break;
5994 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5995 		if (*new_view) {
5996 			/* traversed from diff view, release diff resources  */
5997 			err = close_diff_view(*new_view);
5998 			if (err)
5999 				break;
6000 			diff_view = *new_view;
6001 		} else {
6002 			if (view_is_parent_view(view))
6003 				view_get_split(view, &begin_y, &begin_x);
6004 
6005 			diff_view = view_open(0, 0, begin_y, begin_x,
6006 			    TOG_VIEW_DIFF);
6007 			if (diff_view == NULL) {
6008 				got_object_commit_close(commit);
6009 				err = got_error_from_errno("view_open");
6010 				break;
6011 			}
6012 		}
6013 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6014 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6015 		got_object_commit_close(commit);
6016 		if (err) {
6017 			view_close(diff_view);
6018 			break;
6019 		}
6020 		s->last_diffed_line = s->first_displayed_line - 1 +
6021 		    s->selected_line;
6022 		if (*new_view)
6023 			break;	/* still open from active diff view */
6024 		if (view_is_parent_view(view) &&
6025 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6026 			err = view_init_hsplit(view, begin_y);
6027 			if (err)
6028 				break;
6029 		}
6030 
6031 		view->focussed = 0;
6032 		diff_view->focussed = 1;
6033 		diff_view->mode = view->mode;
6034 		diff_view->nlines = view->lines - begin_y;
6035 		if (view_is_parent_view(view)) {
6036 			view_transfer_size(diff_view, view);
6037 			err = view_close_child(view);
6038 			if (err)
6039 				break;
6040 			err = view_set_child(view, diff_view);
6041 			if (err)
6042 				break;
6043 			view->focus_child = 1;
6044 		} else
6045 			*new_view = diff_view;
6046 		if (err)
6047 			break;
6048 		break;
6049 	}
6050 	case CTRL('d'):
6051 	case 'd':
6052 		nscroll /= 2;
6053 		/* FALL THROUGH */
6054 	case KEY_NPAGE:
6055 	case CTRL('f'):
6056 	case 'f':
6057 	case ' ':
6058 		if (s->last_displayed_line >= s->blame.nlines &&
6059 		    s->selected_line >= MIN(s->blame.nlines,
6060 		    view->nlines - 2)) {
6061 			view->count = 0;
6062 			break;
6063 		}
6064 		if (s->last_displayed_line >= s->blame.nlines &&
6065 		    s->selected_line < view->nlines - 2) {
6066 			s->selected_line +=
6067 			    MIN(nscroll, s->last_displayed_line -
6068 			    s->first_displayed_line - s->selected_line + 1);
6069 		}
6070 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6071 			s->first_displayed_line += nscroll;
6072 		else
6073 			s->first_displayed_line =
6074 			    s->blame.nlines - (view->nlines - 3);
6075 		break;
6076 	case KEY_RESIZE:
6077 		if (s->selected_line > view->nlines - 2) {
6078 			s->selected_line = MIN(s->blame.nlines,
6079 			    view->nlines - 2);
6080 		}
6081 		break;
6082 	default:
6083 		view->count = 0;
6084 		break;
6085 	}
6086 	return thread_err ? thread_err : err;
6087 }
6088 
6089 static const struct got_error *
6090 reset_blame_view(struct tog_view *view)
6091 {
6092 	const struct got_error *err;
6093 	struct tog_blame_view_state *s = &view->state.blame;
6094 
6095 	view->count = 0;
6096 	s->done = 1;
6097 	err = stop_blame(&s->blame);
6098 	s->done = 0;
6099 	if (err)
6100 		return err;
6101 	return run_blame(view);
6102 }
6103 
6104 static const struct got_error *
6105 cmd_blame(int argc, char *argv[])
6106 {
6107 	const struct got_error *error;
6108 	struct got_repository *repo = NULL;
6109 	struct got_worktree *worktree = NULL;
6110 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6111 	char *link_target = NULL;
6112 	struct got_object_id *commit_id = NULL;
6113 	struct got_commit_object *commit = NULL;
6114 	char *commit_id_str = NULL;
6115 	int ch;
6116 	struct tog_view *view;
6117 	int *pack_fds = NULL;
6118 
6119 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6120 		switch (ch) {
6121 		case 'c':
6122 			commit_id_str = optarg;
6123 			break;
6124 		case 'r':
6125 			repo_path = realpath(optarg, NULL);
6126 			if (repo_path == NULL)
6127 				return got_error_from_errno2("realpath",
6128 				    optarg);
6129 			break;
6130 		default:
6131 			usage_blame();
6132 			/* NOTREACHED */
6133 		}
6134 	}
6135 
6136 	argc -= optind;
6137 	argv += optind;
6138 
6139 	if (argc != 1)
6140 		usage_blame();
6141 
6142 	error = got_repo_pack_fds_open(&pack_fds);
6143 	if (error != NULL)
6144 		goto done;
6145 
6146 	if (repo_path == NULL) {
6147 		cwd = getcwd(NULL, 0);
6148 		if (cwd == NULL)
6149 			return got_error_from_errno("getcwd");
6150 		error = got_worktree_open(&worktree, cwd);
6151 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6152 			goto done;
6153 		if (worktree)
6154 			repo_path =
6155 			    strdup(got_worktree_get_repo_path(worktree));
6156 		else
6157 			repo_path = strdup(cwd);
6158 		if (repo_path == NULL) {
6159 			error = got_error_from_errno("strdup");
6160 			goto done;
6161 		}
6162 	}
6163 
6164 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6165 	if (error != NULL)
6166 		goto done;
6167 
6168 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6169 	    worktree);
6170 	if (error)
6171 		goto done;
6172 
6173 	init_curses();
6174 
6175 	error = apply_unveil(got_repo_get_path(repo), NULL);
6176 	if (error)
6177 		goto done;
6178 
6179 	error = tog_load_refs(repo, 0);
6180 	if (error)
6181 		goto done;
6182 
6183 	if (commit_id_str == NULL) {
6184 		struct got_reference *head_ref;
6185 		error = got_ref_open(&head_ref, repo, worktree ?
6186 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6187 		if (error != NULL)
6188 			goto done;
6189 		error = got_ref_resolve(&commit_id, repo, head_ref);
6190 		got_ref_close(head_ref);
6191 	} else {
6192 		error = got_repo_match_object_id(&commit_id, NULL,
6193 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6194 	}
6195 	if (error != NULL)
6196 		goto done;
6197 
6198 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6199 	if (view == NULL) {
6200 		error = got_error_from_errno("view_open");
6201 		goto done;
6202 	}
6203 
6204 	error = got_object_open_as_commit(&commit, repo, commit_id);
6205 	if (error)
6206 		goto done;
6207 
6208 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6209 	    commit, repo);
6210 	if (error)
6211 		goto done;
6212 
6213 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6214 	    commit_id, repo);
6215 	if (error)
6216 		goto done;
6217 	if (worktree) {
6218 		/* Release work tree lock. */
6219 		got_worktree_close(worktree);
6220 		worktree = NULL;
6221 	}
6222 	error = view_loop(view);
6223 done:
6224 	free(repo_path);
6225 	free(in_repo_path);
6226 	free(link_target);
6227 	free(cwd);
6228 	free(commit_id);
6229 	if (commit)
6230 		got_object_commit_close(commit);
6231 	if (worktree)
6232 		got_worktree_close(worktree);
6233 	if (repo) {
6234 		const struct got_error *close_err = got_repo_close(repo);
6235 		if (error == NULL)
6236 			error = close_err;
6237 	}
6238 	if (pack_fds) {
6239 		const struct got_error *pack_err =
6240 		    got_repo_pack_fds_close(pack_fds);
6241 		if (error == NULL)
6242 			error = pack_err;
6243 	}
6244 	tog_free_refs();
6245 	return error;
6246 }
6247 
6248 static const struct got_error *
6249 draw_tree_entries(struct tog_view *view, const char *parent_path)
6250 {
6251 	struct tog_tree_view_state *s = &view->state.tree;
6252 	const struct got_error *err = NULL;
6253 	struct got_tree_entry *te;
6254 	wchar_t *wline;
6255 	struct tog_color *tc;
6256 	int width, n, i, nentries;
6257 	int limit = view->nlines;
6258 
6259 	s->ndisplayed = 0;
6260 	if (view_is_hsplit_top(view))
6261 		--limit;  /* border */
6262 
6263 	werase(view->window);
6264 
6265 	if (limit == 0)
6266 		return NULL;
6267 
6268 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6269 	    0, 0);
6270 	if (err)
6271 		return err;
6272 	if (view_needs_focus_indication(view))
6273 		wstandout(view->window);
6274 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6275 	if (tc)
6276 		wattr_on(view->window,
6277 		    COLOR_PAIR(tc->colorpair), NULL);
6278 	waddwstr(view->window, wline);
6279 	if (tc)
6280 		wattr_off(view->window,
6281 		    COLOR_PAIR(tc->colorpair), NULL);
6282 	if (view_needs_focus_indication(view))
6283 		wstandend(view->window);
6284 	free(wline);
6285 	wline = NULL;
6286 	if (width < view->ncols - 1)
6287 		waddch(view->window, '\n');
6288 	if (--limit <= 0)
6289 		return NULL;
6290 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6291 	    0, 0);
6292 	if (err)
6293 		return err;
6294 	waddwstr(view->window, wline);
6295 	free(wline);
6296 	wline = NULL;
6297 	if (width < view->ncols - 1)
6298 		waddch(view->window, '\n');
6299 	if (--limit <= 0)
6300 		return NULL;
6301 	waddch(view->window, '\n');
6302 	if (--limit <= 0)
6303 		return NULL;
6304 
6305 	if (s->first_displayed_entry == NULL) {
6306 		te = got_object_tree_get_first_entry(s->tree);
6307 		if (s->selected == 0) {
6308 			if (view->focussed)
6309 				wstandout(view->window);
6310 			s->selected_entry = NULL;
6311 		}
6312 		waddstr(view->window, "  ..\n");	/* parent directory */
6313 		if (s->selected == 0 && view->focussed)
6314 			wstandend(view->window);
6315 		s->ndisplayed++;
6316 		if (--limit <= 0)
6317 			return NULL;
6318 		n = 1;
6319 	} else {
6320 		n = 0;
6321 		te = s->first_displayed_entry;
6322 	}
6323 
6324 	nentries = got_object_tree_get_nentries(s->tree);
6325 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6326 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6327 		const char *modestr = "";
6328 		mode_t mode;
6329 
6330 		te = got_object_tree_get_entry(s->tree, i);
6331 		mode = got_tree_entry_get_mode(te);
6332 
6333 		if (s->show_ids) {
6334 			err = got_object_id_str(&id_str,
6335 			    got_tree_entry_get_id(te));
6336 			if (err)
6337 				return got_error_from_errno(
6338 				    "got_object_id_str");
6339 		}
6340 		if (got_object_tree_entry_is_submodule(te))
6341 			modestr = "$";
6342 		else if (S_ISLNK(mode)) {
6343 			int i;
6344 
6345 			err = got_tree_entry_get_symlink_target(&link_target,
6346 			    te, s->repo);
6347 			if (err) {
6348 				free(id_str);
6349 				return err;
6350 			}
6351 			for (i = 0; i < strlen(link_target); i++) {
6352 				if (!isprint((unsigned char)link_target[i]))
6353 					link_target[i] = '?';
6354 			}
6355 			modestr = "@";
6356 		}
6357 		else if (S_ISDIR(mode))
6358 			modestr = "/";
6359 		else if (mode & S_IXUSR)
6360 			modestr = "*";
6361 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6362 		    got_tree_entry_get_name(te), modestr,
6363 		    link_target ? " -> ": "",
6364 		    link_target ? link_target : "") == -1) {
6365 			free(id_str);
6366 			free(link_target);
6367 			return got_error_from_errno("asprintf");
6368 		}
6369 		free(id_str);
6370 		free(link_target);
6371 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6372 		    0, 0);
6373 		if (err) {
6374 			free(line);
6375 			break;
6376 		}
6377 		if (n == s->selected) {
6378 			if (view->focussed)
6379 				wstandout(view->window);
6380 			s->selected_entry = te;
6381 		}
6382 		tc = match_color(&s->colors, line);
6383 		if (tc)
6384 			wattr_on(view->window,
6385 			    COLOR_PAIR(tc->colorpair), NULL);
6386 		waddwstr(view->window, wline);
6387 		if (tc)
6388 			wattr_off(view->window,
6389 			    COLOR_PAIR(tc->colorpair), NULL);
6390 		if (width < view->ncols - 1)
6391 			waddch(view->window, '\n');
6392 		if (n == s->selected && view->focussed)
6393 			wstandend(view->window);
6394 		free(line);
6395 		free(wline);
6396 		wline = NULL;
6397 		n++;
6398 		s->ndisplayed++;
6399 		s->last_displayed_entry = te;
6400 		if (--limit <= 0)
6401 			break;
6402 	}
6403 
6404 	return err;
6405 }
6406 
6407 static void
6408 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6409 {
6410 	struct got_tree_entry *te;
6411 	int isroot = s->tree == s->root;
6412 	int i = 0;
6413 
6414 	if (s->first_displayed_entry == NULL)
6415 		return;
6416 
6417 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6418 	while (i++ < maxscroll) {
6419 		if (te == NULL) {
6420 			if (!isroot)
6421 				s->first_displayed_entry = NULL;
6422 			break;
6423 		}
6424 		s->first_displayed_entry = te;
6425 		te = got_tree_entry_get_prev(s->tree, te);
6426 	}
6427 }
6428 
6429 static const struct got_error *
6430 tree_scroll_down(struct tog_view *view, int maxscroll)
6431 {
6432 	struct tog_tree_view_state *s = &view->state.tree;
6433 	struct got_tree_entry *next, *last;
6434 	int n = 0;
6435 
6436 	if (s->first_displayed_entry)
6437 		next = got_tree_entry_get_next(s->tree,
6438 		    s->first_displayed_entry);
6439 	else
6440 		next = got_object_tree_get_first_entry(s->tree);
6441 
6442 	last = s->last_displayed_entry;
6443 	while (next && n++ < maxscroll) {
6444 		if (last)
6445 			last = got_tree_entry_get_next(s->tree, last);
6446 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6447 			s->first_displayed_entry = next;
6448 			next = got_tree_entry_get_next(s->tree, next);
6449 		}
6450 	}
6451 
6452 	return NULL;
6453 }
6454 
6455 static const struct got_error *
6456 tree_entry_path(char **path, struct tog_parent_trees *parents,
6457     struct got_tree_entry *te)
6458 {
6459 	const struct got_error *err = NULL;
6460 	struct tog_parent_tree *pt;
6461 	size_t len = 2; /* for leading slash and NUL */
6462 
6463 	TAILQ_FOREACH(pt, parents, entry)
6464 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6465 		    + 1 /* slash */;
6466 	if (te)
6467 		len += strlen(got_tree_entry_get_name(te));
6468 
6469 	*path = calloc(1, len);
6470 	if (path == NULL)
6471 		return got_error_from_errno("calloc");
6472 
6473 	(*path)[0] = '/';
6474 	pt = TAILQ_LAST(parents, tog_parent_trees);
6475 	while (pt) {
6476 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6477 		if (strlcat(*path, name, len) >= len) {
6478 			err = got_error(GOT_ERR_NO_SPACE);
6479 			goto done;
6480 		}
6481 		if (strlcat(*path, "/", len) >= len) {
6482 			err = got_error(GOT_ERR_NO_SPACE);
6483 			goto done;
6484 		}
6485 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6486 	}
6487 	if (te) {
6488 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6489 			err = got_error(GOT_ERR_NO_SPACE);
6490 			goto done;
6491 		}
6492 	}
6493 done:
6494 	if (err) {
6495 		free(*path);
6496 		*path = NULL;
6497 	}
6498 	return err;
6499 }
6500 
6501 static const struct got_error *
6502 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6503     struct got_tree_entry *te, struct tog_parent_trees *parents,
6504     struct got_object_id *commit_id, struct got_repository *repo)
6505 {
6506 	const struct got_error *err = NULL;
6507 	char *path;
6508 	struct tog_view *blame_view;
6509 
6510 	*new_view = NULL;
6511 
6512 	err = tree_entry_path(&path, parents, te);
6513 	if (err)
6514 		return err;
6515 
6516 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6517 	if (blame_view == NULL) {
6518 		err = got_error_from_errno("view_open");
6519 		goto done;
6520 	}
6521 
6522 	err = open_blame_view(blame_view, path, commit_id, repo);
6523 	if (err) {
6524 		if (err->code == GOT_ERR_CANCELLED)
6525 			err = NULL;
6526 		view_close(blame_view);
6527 	} else
6528 		*new_view = blame_view;
6529 done:
6530 	free(path);
6531 	return err;
6532 }
6533 
6534 static const struct got_error *
6535 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6536     struct tog_tree_view_state *s)
6537 {
6538 	struct tog_view *log_view;
6539 	const struct got_error *err = NULL;
6540 	char *path;
6541 
6542 	*new_view = NULL;
6543 
6544 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6545 	if (log_view == NULL)
6546 		return got_error_from_errno("view_open");
6547 
6548 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6549 	if (err)
6550 		return err;
6551 
6552 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6553 	    path, 0);
6554 	if (err)
6555 		view_close(log_view);
6556 	else
6557 		*new_view = log_view;
6558 	free(path);
6559 	return err;
6560 }
6561 
6562 static const struct got_error *
6563 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6564     const char *head_ref_name, struct got_repository *repo)
6565 {
6566 	const struct got_error *err = NULL;
6567 	char *commit_id_str = NULL;
6568 	struct tog_tree_view_state *s = &view->state.tree;
6569 	struct got_commit_object *commit = NULL;
6570 
6571 	TAILQ_INIT(&s->parents);
6572 	STAILQ_INIT(&s->colors);
6573 
6574 	s->commit_id = got_object_id_dup(commit_id);
6575 	if (s->commit_id == NULL)
6576 		return got_error_from_errno("got_object_id_dup");
6577 
6578 	err = got_object_open_as_commit(&commit, repo, commit_id);
6579 	if (err)
6580 		goto done;
6581 
6582 	/*
6583 	 * The root is opened here and will be closed when the view is closed.
6584 	 * Any visited subtrees and their path-wise parents are opened and
6585 	 * closed on demand.
6586 	 */
6587 	err = got_object_open_as_tree(&s->root, repo,
6588 	    got_object_commit_get_tree_id(commit));
6589 	if (err)
6590 		goto done;
6591 	s->tree = s->root;
6592 
6593 	err = got_object_id_str(&commit_id_str, commit_id);
6594 	if (err != NULL)
6595 		goto done;
6596 
6597 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6598 		err = got_error_from_errno("asprintf");
6599 		goto done;
6600 	}
6601 
6602 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6603 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6604 	if (head_ref_name) {
6605 		s->head_ref_name = strdup(head_ref_name);
6606 		if (s->head_ref_name == NULL) {
6607 			err = got_error_from_errno("strdup");
6608 			goto done;
6609 		}
6610 	}
6611 	s->repo = repo;
6612 
6613 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6614 		err = add_color(&s->colors, "\\$$",
6615 		    TOG_COLOR_TREE_SUBMODULE,
6616 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6617 		if (err)
6618 			goto done;
6619 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6620 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6621 		if (err)
6622 			goto done;
6623 		err = add_color(&s->colors, "/$",
6624 		    TOG_COLOR_TREE_DIRECTORY,
6625 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6626 		if (err)
6627 			goto done;
6628 
6629 		err = add_color(&s->colors, "\\*$",
6630 		    TOG_COLOR_TREE_EXECUTABLE,
6631 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6632 		if (err)
6633 			goto done;
6634 
6635 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6636 		    get_color_value("TOG_COLOR_COMMIT"));
6637 		if (err)
6638 			goto done;
6639 	}
6640 
6641 	view->show = show_tree_view;
6642 	view->input = input_tree_view;
6643 	view->close = close_tree_view;
6644 	view->search_start = search_start_tree_view;
6645 	view->search_next = search_next_tree_view;
6646 done:
6647 	free(commit_id_str);
6648 	if (commit)
6649 		got_object_commit_close(commit);
6650 	if (err)
6651 		close_tree_view(view);
6652 	return err;
6653 }
6654 
6655 static const struct got_error *
6656 close_tree_view(struct tog_view *view)
6657 {
6658 	struct tog_tree_view_state *s = &view->state.tree;
6659 
6660 	free_colors(&s->colors);
6661 	free(s->tree_label);
6662 	s->tree_label = NULL;
6663 	free(s->commit_id);
6664 	s->commit_id = NULL;
6665 	free(s->head_ref_name);
6666 	s->head_ref_name = NULL;
6667 	while (!TAILQ_EMPTY(&s->parents)) {
6668 		struct tog_parent_tree *parent;
6669 		parent = TAILQ_FIRST(&s->parents);
6670 		TAILQ_REMOVE(&s->parents, parent, entry);
6671 		if (parent->tree != s->root)
6672 			got_object_tree_close(parent->tree);
6673 		free(parent);
6674 
6675 	}
6676 	if (s->tree != NULL && s->tree != s->root)
6677 		got_object_tree_close(s->tree);
6678 	if (s->root)
6679 		got_object_tree_close(s->root);
6680 	return NULL;
6681 }
6682 
6683 static const struct got_error *
6684 search_start_tree_view(struct tog_view *view)
6685 {
6686 	struct tog_tree_view_state *s = &view->state.tree;
6687 
6688 	s->matched_entry = NULL;
6689 	return NULL;
6690 }
6691 
6692 static int
6693 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6694 {
6695 	regmatch_t regmatch;
6696 
6697 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6698 	    0) == 0;
6699 }
6700 
6701 static const struct got_error *
6702 search_next_tree_view(struct tog_view *view)
6703 {
6704 	struct tog_tree_view_state *s = &view->state.tree;
6705 	struct got_tree_entry *te = NULL;
6706 
6707 	if (!view->searching) {
6708 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6709 		return NULL;
6710 	}
6711 
6712 	if (s->matched_entry) {
6713 		if (view->searching == TOG_SEARCH_FORWARD) {
6714 			if (s->selected_entry)
6715 				te = got_tree_entry_get_next(s->tree,
6716 				    s->selected_entry);
6717 			else
6718 				te = got_object_tree_get_first_entry(s->tree);
6719 		} else {
6720 			if (s->selected_entry == NULL)
6721 				te = got_object_tree_get_last_entry(s->tree);
6722 			else
6723 				te = got_tree_entry_get_prev(s->tree,
6724 				    s->selected_entry);
6725 		}
6726 	} else {
6727 		if (s->selected_entry)
6728 			te = s->selected_entry;
6729 		else if (view->searching == TOG_SEARCH_FORWARD)
6730 			te = got_object_tree_get_first_entry(s->tree);
6731 		else
6732 			te = got_object_tree_get_last_entry(s->tree);
6733 	}
6734 
6735 	while (1) {
6736 		if (te == NULL) {
6737 			if (s->matched_entry == NULL) {
6738 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6739 				return NULL;
6740 			}
6741 			if (view->searching == TOG_SEARCH_FORWARD)
6742 				te = got_object_tree_get_first_entry(s->tree);
6743 			else
6744 				te = got_object_tree_get_last_entry(s->tree);
6745 		}
6746 
6747 		if (match_tree_entry(te, &view->regex)) {
6748 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6749 			s->matched_entry = te;
6750 			break;
6751 		}
6752 
6753 		if (view->searching == TOG_SEARCH_FORWARD)
6754 			te = got_tree_entry_get_next(s->tree, te);
6755 		else
6756 			te = got_tree_entry_get_prev(s->tree, te);
6757 	}
6758 
6759 	if (s->matched_entry) {
6760 		s->first_displayed_entry = s->matched_entry;
6761 		s->selected = 0;
6762 	}
6763 
6764 	return NULL;
6765 }
6766 
6767 static const struct got_error *
6768 show_tree_view(struct tog_view *view)
6769 {
6770 	const struct got_error *err = NULL;
6771 	struct tog_tree_view_state *s = &view->state.tree;
6772 	char *parent_path;
6773 
6774 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6775 	if (err)
6776 		return err;
6777 
6778 	err = draw_tree_entries(view, parent_path);
6779 	free(parent_path);
6780 
6781 	view_border(view);
6782 	return err;
6783 }
6784 
6785 static const struct got_error *
6786 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6787 {
6788 	const struct got_error *err = NULL;
6789 	struct tog_tree_view_state *s = &view->state.tree;
6790 	struct tog_view *log_view, *ref_view;
6791 	struct got_tree_entry *te;
6792 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6793 
6794 	switch (ch) {
6795 	case 'i':
6796 		s->show_ids = !s->show_ids;
6797 		view->count = 0;
6798 		break;
6799 	case 'l':
6800 		view->count = 0;
6801 		if (!s->selected_entry)
6802 			break;
6803 		if (view_is_parent_view(view))
6804 			view_get_split(view, &begin_y, &begin_x);
6805 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6806 		if (view_is_parent_view(view) &&
6807 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6808 			err = view_init_hsplit(view, begin_y);
6809 			if (err)
6810 				break;
6811 		}
6812 		view->focussed = 0;
6813 		log_view->focussed = 1;
6814 		log_view->mode = view->mode;
6815 		log_view->nlines = view->lines - begin_y;
6816 		if (view_is_parent_view(view)) {
6817 			view_transfer_size(log_view, view);
6818 			err = view_close_child(view);
6819 			if (err)
6820 				return err;
6821 			err = view_set_child(view, log_view);
6822 			if (err)
6823 				return err;
6824 			view->focus_child = 1;
6825 		} else
6826 			*new_view = log_view;
6827 		break;
6828 	case 'r':
6829 		view->count = 0;
6830 		if (view_is_parent_view(view))
6831 			view_get_split(view, &begin_y, &begin_x);
6832 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6833 		if (ref_view == NULL)
6834 			return got_error_from_errno("view_open");
6835 		err = open_ref_view(ref_view, s->repo);
6836 		if (err) {
6837 			view_close(ref_view);
6838 			return err;
6839 		}
6840 		if (view_is_parent_view(view) &&
6841 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6842 			err = view_init_hsplit(view, begin_y);
6843 			if (err)
6844 				break;
6845 		}
6846 		view->focussed = 0;
6847 		ref_view->focussed = 1;
6848 		ref_view->mode = view->mode;
6849 		ref_view->nlines = view->lines - begin_y;
6850 		if (view_is_parent_view(view)) {
6851 			view_transfer_size(ref_view, view);
6852 			err = view_close_child(view);
6853 			if (err)
6854 				return err;
6855 			err = view_set_child(view, ref_view);
6856 			if (err)
6857 				return err;
6858 			view->focus_child = 1;
6859 		} else
6860 			*new_view = ref_view;
6861 		break;
6862 	case 'g':
6863 	case KEY_HOME:
6864 		s->selected = 0;
6865 		view->count = 0;
6866 		if (s->tree == s->root)
6867 			s->first_displayed_entry =
6868 			    got_object_tree_get_first_entry(s->tree);
6869 		else
6870 			s->first_displayed_entry = NULL;
6871 		break;
6872 	case 'G':
6873 	case KEY_END: {
6874 		int eos = view->nlines - 3;
6875 
6876 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6877 			--eos;  /* border */
6878 		s->selected = 0;
6879 		view->count = 0;
6880 		te = got_object_tree_get_last_entry(s->tree);
6881 		for (n = 0; n < eos; n++) {
6882 			if (te == NULL) {
6883 				if (s->tree != s->root) {
6884 					s->first_displayed_entry = NULL;
6885 					n++;
6886 				}
6887 				break;
6888 			}
6889 			s->first_displayed_entry = te;
6890 			te = got_tree_entry_get_prev(s->tree, te);
6891 		}
6892 		if (n > 0)
6893 			s->selected = n - 1;
6894 		break;
6895 	}
6896 	case 'k':
6897 	case KEY_UP:
6898 	case CTRL('p'):
6899 		if (s->selected > 0) {
6900 			s->selected--;
6901 			break;
6902 		}
6903 		tree_scroll_up(s, 1);
6904 		if (s->selected_entry == NULL ||
6905 		    (s->tree == s->root && s->selected_entry ==
6906 		     got_object_tree_get_first_entry(s->tree)))
6907 			view->count = 0;
6908 		break;
6909 	case CTRL('u'):
6910 	case 'u':
6911 		nscroll /= 2;
6912 		/* FALL THROUGH */
6913 	case KEY_PPAGE:
6914 	case CTRL('b'):
6915 	case 'b':
6916 		if (s->tree == s->root) {
6917 			if (got_object_tree_get_first_entry(s->tree) ==
6918 			    s->first_displayed_entry)
6919 				s->selected -= MIN(s->selected, nscroll);
6920 		} else {
6921 			if (s->first_displayed_entry == NULL)
6922 				s->selected -= MIN(s->selected, nscroll);
6923 		}
6924 		tree_scroll_up(s, MAX(0, nscroll));
6925 		if (s->selected_entry == NULL ||
6926 		    (s->tree == s->root && s->selected_entry ==
6927 		     got_object_tree_get_first_entry(s->tree)))
6928 			view->count = 0;
6929 		break;
6930 	case 'j':
6931 	case KEY_DOWN:
6932 	case CTRL('n'):
6933 		if (s->selected < s->ndisplayed - 1) {
6934 			s->selected++;
6935 			break;
6936 		}
6937 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6938 		    == NULL) {
6939 			/* can't scroll any further */
6940 			view->count = 0;
6941 			break;
6942 		}
6943 		tree_scroll_down(view, 1);
6944 		break;
6945 	case CTRL('d'):
6946 	case 'd':
6947 		nscroll /= 2;
6948 		/* FALL THROUGH */
6949 	case KEY_NPAGE:
6950 	case CTRL('f'):
6951 	case 'f':
6952 	case ' ':
6953 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6954 		    == NULL) {
6955 			/* can't scroll any further; move cursor down */
6956 			if (s->selected < s->ndisplayed - 1)
6957 				s->selected += MIN(nscroll,
6958 				    s->ndisplayed - s->selected - 1);
6959 			else
6960 				view->count = 0;
6961 			break;
6962 		}
6963 		tree_scroll_down(view, nscroll);
6964 		break;
6965 	case KEY_ENTER:
6966 	case '\r':
6967 	case KEY_BACKSPACE:
6968 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6969 			struct tog_parent_tree *parent;
6970 			/* user selected '..' */
6971 			if (s->tree == s->root) {
6972 				view->count = 0;
6973 				break;
6974 			}
6975 			parent = TAILQ_FIRST(&s->parents);
6976 			TAILQ_REMOVE(&s->parents, parent,
6977 			    entry);
6978 			got_object_tree_close(s->tree);
6979 			s->tree = parent->tree;
6980 			s->first_displayed_entry =
6981 			    parent->first_displayed_entry;
6982 			s->selected_entry =
6983 			    parent->selected_entry;
6984 			s->selected = parent->selected;
6985 			if (s->selected > view->nlines - 3) {
6986 				err = offset_selection_down(view);
6987 				if (err)
6988 					break;
6989 			}
6990 			free(parent);
6991 		} else if (S_ISDIR(got_tree_entry_get_mode(
6992 		    s->selected_entry))) {
6993 			struct got_tree_object *subtree;
6994 			view->count = 0;
6995 			err = got_object_open_as_tree(&subtree, s->repo,
6996 			    got_tree_entry_get_id(s->selected_entry));
6997 			if (err)
6998 				break;
6999 			err = tree_view_visit_subtree(s, subtree);
7000 			if (err) {
7001 				got_object_tree_close(subtree);
7002 				break;
7003 			}
7004 		} else if (S_ISREG(got_tree_entry_get_mode(
7005 		    s->selected_entry))) {
7006 			struct tog_view *blame_view;
7007 			int begin_x = 0, begin_y = 0;
7008 
7009 			if (view_is_parent_view(view))
7010 				view_get_split(view, &begin_y, &begin_x);
7011 
7012 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
7013 			    s->selected_entry, &s->parents,
7014 			    s->commit_id, s->repo);
7015 			if (err)
7016 				break;
7017 
7018 			if (view_is_parent_view(view) &&
7019 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
7020 				err = view_init_hsplit(view, begin_y);
7021 				if (err)
7022 					break;
7023 			}
7024 
7025 			view->count = 0;
7026 			view->focussed = 0;
7027 			blame_view->focussed = 1;
7028 			blame_view->mode = view->mode;
7029 			blame_view->nlines = view->lines - begin_y;
7030 			if (view_is_parent_view(view)) {
7031 				view_transfer_size(blame_view, view);
7032 				err = view_close_child(view);
7033 				if (err)
7034 					return err;
7035 				err = view_set_child(view, blame_view);
7036 				if (err)
7037 					return err;
7038 				view->focus_child = 1;
7039 			} else
7040 				*new_view = blame_view;
7041 		}
7042 		break;
7043 	case KEY_RESIZE:
7044 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7045 			s->selected = view->nlines - 4;
7046 		view->count = 0;
7047 		break;
7048 	default:
7049 		view->count = 0;
7050 		break;
7051 	}
7052 
7053 	return err;
7054 }
7055 
7056 __dead static void
7057 usage_tree(void)
7058 {
7059 	endwin();
7060 	fprintf(stderr,
7061 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7062 	    getprogname());
7063 	exit(1);
7064 }
7065 
7066 static const struct got_error *
7067 cmd_tree(int argc, char *argv[])
7068 {
7069 	const struct got_error *error;
7070 	struct got_repository *repo = NULL;
7071 	struct got_worktree *worktree = NULL;
7072 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7073 	struct got_object_id *commit_id = NULL;
7074 	struct got_commit_object *commit = NULL;
7075 	const char *commit_id_arg = NULL;
7076 	char *label = NULL;
7077 	struct got_reference *ref = NULL;
7078 	const char *head_ref_name = NULL;
7079 	int ch;
7080 	struct tog_view *view;
7081 	int *pack_fds = NULL;
7082 
7083 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7084 		switch (ch) {
7085 		case 'c':
7086 			commit_id_arg = optarg;
7087 			break;
7088 		case 'r':
7089 			repo_path = realpath(optarg, NULL);
7090 			if (repo_path == NULL)
7091 				return got_error_from_errno2("realpath",
7092 				    optarg);
7093 			break;
7094 		default:
7095 			usage_tree();
7096 			/* NOTREACHED */
7097 		}
7098 	}
7099 
7100 	argc -= optind;
7101 	argv += optind;
7102 
7103 	if (argc > 1)
7104 		usage_tree();
7105 
7106 	error = got_repo_pack_fds_open(&pack_fds);
7107 	if (error != NULL)
7108 		goto done;
7109 
7110 	if (repo_path == NULL) {
7111 		cwd = getcwd(NULL, 0);
7112 		if (cwd == NULL)
7113 			return got_error_from_errno("getcwd");
7114 		error = got_worktree_open(&worktree, cwd);
7115 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7116 			goto done;
7117 		if (worktree)
7118 			repo_path =
7119 			    strdup(got_worktree_get_repo_path(worktree));
7120 		else
7121 			repo_path = strdup(cwd);
7122 		if (repo_path == NULL) {
7123 			error = got_error_from_errno("strdup");
7124 			goto done;
7125 		}
7126 	}
7127 
7128 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7129 	if (error != NULL)
7130 		goto done;
7131 
7132 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7133 	    repo, worktree);
7134 	if (error)
7135 		goto done;
7136 
7137 	init_curses();
7138 
7139 	error = apply_unveil(got_repo_get_path(repo), NULL);
7140 	if (error)
7141 		goto done;
7142 
7143 	error = tog_load_refs(repo, 0);
7144 	if (error)
7145 		goto done;
7146 
7147 	if (commit_id_arg == NULL) {
7148 		error = got_repo_match_object_id(&commit_id, &label,
7149 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7150 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7151 		if (error)
7152 			goto done;
7153 		head_ref_name = label;
7154 	} else {
7155 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7156 		if (error == NULL)
7157 			head_ref_name = got_ref_get_name(ref);
7158 		else if (error->code != GOT_ERR_NOT_REF)
7159 			goto done;
7160 		error = got_repo_match_object_id(&commit_id, NULL,
7161 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7162 		if (error)
7163 			goto done;
7164 	}
7165 
7166 	error = got_object_open_as_commit(&commit, repo, commit_id);
7167 	if (error)
7168 		goto done;
7169 
7170 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7171 	if (view == NULL) {
7172 		error = got_error_from_errno("view_open");
7173 		goto done;
7174 	}
7175 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7176 	if (error)
7177 		goto done;
7178 	if (!got_path_is_root_dir(in_repo_path)) {
7179 		error = tree_view_walk_path(&view->state.tree, commit,
7180 		    in_repo_path);
7181 		if (error)
7182 			goto done;
7183 	}
7184 
7185 	if (worktree) {
7186 		/* Release work tree lock. */
7187 		got_worktree_close(worktree);
7188 		worktree = NULL;
7189 	}
7190 	error = view_loop(view);
7191 done:
7192 	free(repo_path);
7193 	free(cwd);
7194 	free(commit_id);
7195 	free(label);
7196 	if (ref)
7197 		got_ref_close(ref);
7198 	if (repo) {
7199 		const struct got_error *close_err = got_repo_close(repo);
7200 		if (error == NULL)
7201 			error = close_err;
7202 	}
7203 	if (pack_fds) {
7204 		const struct got_error *pack_err =
7205 		    got_repo_pack_fds_close(pack_fds);
7206 		if (error == NULL)
7207 			error = pack_err;
7208 	}
7209 	tog_free_refs();
7210 	return error;
7211 }
7212 
7213 static const struct got_error *
7214 ref_view_load_refs(struct tog_ref_view_state *s)
7215 {
7216 	struct got_reflist_entry *sre;
7217 	struct tog_reflist_entry *re;
7218 
7219 	s->nrefs = 0;
7220 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7221 		if (strncmp(got_ref_get_name(sre->ref),
7222 		    "refs/got/", 9) == 0 &&
7223 		    strncmp(got_ref_get_name(sre->ref),
7224 		    "refs/got/backup/", 16) != 0)
7225 			continue;
7226 
7227 		re = malloc(sizeof(*re));
7228 		if (re == NULL)
7229 			return got_error_from_errno("malloc");
7230 
7231 		re->ref = got_ref_dup(sre->ref);
7232 		if (re->ref == NULL)
7233 			return got_error_from_errno("got_ref_dup");
7234 		re->idx = s->nrefs++;
7235 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7236 	}
7237 
7238 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7239 	return NULL;
7240 }
7241 
7242 static void
7243 ref_view_free_refs(struct tog_ref_view_state *s)
7244 {
7245 	struct tog_reflist_entry *re;
7246 
7247 	while (!TAILQ_EMPTY(&s->refs)) {
7248 		re = TAILQ_FIRST(&s->refs);
7249 		TAILQ_REMOVE(&s->refs, re, entry);
7250 		got_ref_close(re->ref);
7251 		free(re);
7252 	}
7253 }
7254 
7255 static const struct got_error *
7256 open_ref_view(struct tog_view *view, struct got_repository *repo)
7257 {
7258 	const struct got_error *err = NULL;
7259 	struct tog_ref_view_state *s = &view->state.ref;
7260 
7261 	s->selected_entry = 0;
7262 	s->repo = repo;
7263 
7264 	TAILQ_INIT(&s->refs);
7265 	STAILQ_INIT(&s->colors);
7266 
7267 	err = ref_view_load_refs(s);
7268 	if (err)
7269 		return err;
7270 
7271 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7272 		err = add_color(&s->colors, "^refs/heads/",
7273 		    TOG_COLOR_REFS_HEADS,
7274 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7275 		if (err)
7276 			goto done;
7277 
7278 		err = add_color(&s->colors, "^refs/tags/",
7279 		    TOG_COLOR_REFS_TAGS,
7280 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7281 		if (err)
7282 			goto done;
7283 
7284 		err = add_color(&s->colors, "^refs/remotes/",
7285 		    TOG_COLOR_REFS_REMOTES,
7286 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7287 		if (err)
7288 			goto done;
7289 
7290 		err = add_color(&s->colors, "^refs/got/backup/",
7291 		    TOG_COLOR_REFS_BACKUP,
7292 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7293 		if (err)
7294 			goto done;
7295 	}
7296 
7297 	view->show = show_ref_view;
7298 	view->input = input_ref_view;
7299 	view->close = close_ref_view;
7300 	view->search_start = search_start_ref_view;
7301 	view->search_next = search_next_ref_view;
7302 done:
7303 	if (err)
7304 		free_colors(&s->colors);
7305 	return err;
7306 }
7307 
7308 static const struct got_error *
7309 close_ref_view(struct tog_view *view)
7310 {
7311 	struct tog_ref_view_state *s = &view->state.ref;
7312 
7313 	ref_view_free_refs(s);
7314 	free_colors(&s->colors);
7315 
7316 	return NULL;
7317 }
7318 
7319 static const struct got_error *
7320 resolve_reflist_entry(struct got_object_id **commit_id,
7321     struct tog_reflist_entry *re, struct got_repository *repo)
7322 {
7323 	const struct got_error *err = NULL;
7324 	struct got_object_id *obj_id;
7325 	struct got_tag_object *tag = NULL;
7326 	int obj_type;
7327 
7328 	*commit_id = NULL;
7329 
7330 	err = got_ref_resolve(&obj_id, repo, re->ref);
7331 	if (err)
7332 		return err;
7333 
7334 	err = got_object_get_type(&obj_type, repo, obj_id);
7335 	if (err)
7336 		goto done;
7337 
7338 	switch (obj_type) {
7339 	case GOT_OBJ_TYPE_COMMIT:
7340 		*commit_id = obj_id;
7341 		break;
7342 	case GOT_OBJ_TYPE_TAG:
7343 		err = got_object_open_as_tag(&tag, repo, obj_id);
7344 		if (err)
7345 			goto done;
7346 		free(obj_id);
7347 		err = got_object_get_type(&obj_type, repo,
7348 		    got_object_tag_get_object_id(tag));
7349 		if (err)
7350 			goto done;
7351 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7352 			err = got_error(GOT_ERR_OBJ_TYPE);
7353 			goto done;
7354 		}
7355 		*commit_id = got_object_id_dup(
7356 		    got_object_tag_get_object_id(tag));
7357 		if (*commit_id == NULL) {
7358 			err = got_error_from_errno("got_object_id_dup");
7359 			goto done;
7360 		}
7361 		break;
7362 	default:
7363 		err = got_error(GOT_ERR_OBJ_TYPE);
7364 		break;
7365 	}
7366 
7367 done:
7368 	if (tag)
7369 		got_object_tag_close(tag);
7370 	if (err) {
7371 		free(*commit_id);
7372 		*commit_id = NULL;
7373 	}
7374 	return err;
7375 }
7376 
7377 static const struct got_error *
7378 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7379     struct tog_reflist_entry *re, struct got_repository *repo)
7380 {
7381 	struct tog_view *log_view;
7382 	const struct got_error *err = NULL;
7383 	struct got_object_id *commit_id = NULL;
7384 
7385 	*new_view = NULL;
7386 
7387 	err = resolve_reflist_entry(&commit_id, re, repo);
7388 	if (err) {
7389 		if (err->code != GOT_ERR_OBJ_TYPE)
7390 			return err;
7391 		else
7392 			return NULL;
7393 	}
7394 
7395 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7396 	if (log_view == NULL) {
7397 		err = got_error_from_errno("view_open");
7398 		goto done;
7399 	}
7400 
7401 	err = open_log_view(log_view, commit_id, repo,
7402 	    got_ref_get_name(re->ref), "", 0);
7403 done:
7404 	if (err)
7405 		view_close(log_view);
7406 	else
7407 		*new_view = log_view;
7408 	free(commit_id);
7409 	return err;
7410 }
7411 
7412 static void
7413 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7414 {
7415 	struct tog_reflist_entry *re;
7416 	int i = 0;
7417 
7418 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7419 		return;
7420 
7421 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7422 	while (i++ < maxscroll) {
7423 		if (re == NULL)
7424 			break;
7425 		s->first_displayed_entry = re;
7426 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7427 	}
7428 }
7429 
7430 static const struct got_error *
7431 ref_scroll_down(struct tog_view *view, int maxscroll)
7432 {
7433 	struct tog_ref_view_state *s = &view->state.ref;
7434 	struct tog_reflist_entry *next, *last;
7435 	int n = 0;
7436 
7437 	if (s->first_displayed_entry)
7438 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7439 	else
7440 		next = TAILQ_FIRST(&s->refs);
7441 
7442 	last = s->last_displayed_entry;
7443 	while (next && n++ < maxscroll) {
7444 		if (last)
7445 			last = TAILQ_NEXT(last, entry);
7446 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7447 			s->first_displayed_entry = next;
7448 			next = TAILQ_NEXT(next, entry);
7449 		}
7450 	}
7451 
7452 	return NULL;
7453 }
7454 
7455 static const struct got_error *
7456 search_start_ref_view(struct tog_view *view)
7457 {
7458 	struct tog_ref_view_state *s = &view->state.ref;
7459 
7460 	s->matched_entry = NULL;
7461 	return NULL;
7462 }
7463 
7464 static int
7465 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7466 {
7467 	regmatch_t regmatch;
7468 
7469 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7470 	    0) == 0;
7471 }
7472 
7473 static const struct got_error *
7474 search_next_ref_view(struct tog_view *view)
7475 {
7476 	struct tog_ref_view_state *s = &view->state.ref;
7477 	struct tog_reflist_entry *re = NULL;
7478 
7479 	if (!view->searching) {
7480 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7481 		return NULL;
7482 	}
7483 
7484 	if (s->matched_entry) {
7485 		if (view->searching == TOG_SEARCH_FORWARD) {
7486 			if (s->selected_entry)
7487 				re = TAILQ_NEXT(s->selected_entry, entry);
7488 			else
7489 				re = TAILQ_PREV(s->selected_entry,
7490 				    tog_reflist_head, entry);
7491 		} else {
7492 			if (s->selected_entry == NULL)
7493 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7494 			else
7495 				re = TAILQ_PREV(s->selected_entry,
7496 				    tog_reflist_head, entry);
7497 		}
7498 	} else {
7499 		if (s->selected_entry)
7500 			re = s->selected_entry;
7501 		else if (view->searching == TOG_SEARCH_FORWARD)
7502 			re = TAILQ_FIRST(&s->refs);
7503 		else
7504 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7505 	}
7506 
7507 	while (1) {
7508 		if (re == NULL) {
7509 			if (s->matched_entry == NULL) {
7510 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7511 				return NULL;
7512 			}
7513 			if (view->searching == TOG_SEARCH_FORWARD)
7514 				re = TAILQ_FIRST(&s->refs);
7515 			else
7516 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7517 		}
7518 
7519 		if (match_reflist_entry(re, &view->regex)) {
7520 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7521 			s->matched_entry = re;
7522 			break;
7523 		}
7524 
7525 		if (view->searching == TOG_SEARCH_FORWARD)
7526 			re = TAILQ_NEXT(re, entry);
7527 		else
7528 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7529 	}
7530 
7531 	if (s->matched_entry) {
7532 		s->first_displayed_entry = s->matched_entry;
7533 		s->selected = 0;
7534 	}
7535 
7536 	return NULL;
7537 }
7538 
7539 static const struct got_error *
7540 show_ref_view(struct tog_view *view)
7541 {
7542 	const struct got_error *err = NULL;
7543 	struct tog_ref_view_state *s = &view->state.ref;
7544 	struct tog_reflist_entry *re;
7545 	char *line = NULL;
7546 	wchar_t *wline;
7547 	struct tog_color *tc;
7548 	int width, n;
7549 	int limit = view->nlines;
7550 
7551 	werase(view->window);
7552 
7553 	s->ndisplayed = 0;
7554 	if (view_is_hsplit_top(view))
7555 		--limit;  /* border */
7556 
7557 	if (limit == 0)
7558 		return NULL;
7559 
7560 	re = s->first_displayed_entry;
7561 
7562 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7563 	    s->nrefs) == -1)
7564 		return got_error_from_errno("asprintf");
7565 
7566 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7567 	if (err) {
7568 		free(line);
7569 		return err;
7570 	}
7571 	if (view_needs_focus_indication(view))
7572 		wstandout(view->window);
7573 	waddwstr(view->window, wline);
7574 	if (view_needs_focus_indication(view))
7575 		wstandend(view->window);
7576 	free(wline);
7577 	wline = NULL;
7578 	free(line);
7579 	line = NULL;
7580 	if (width < view->ncols - 1)
7581 		waddch(view->window, '\n');
7582 	if (--limit <= 0)
7583 		return NULL;
7584 
7585 	n = 0;
7586 	while (re && limit > 0) {
7587 		char *line = NULL;
7588 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7589 
7590 		if (s->show_date) {
7591 			struct got_commit_object *ci;
7592 			struct got_tag_object *tag;
7593 			struct got_object_id *id;
7594 			struct tm tm;
7595 			time_t t;
7596 
7597 			err = got_ref_resolve(&id, s->repo, re->ref);
7598 			if (err)
7599 				return err;
7600 			err = got_object_open_as_tag(&tag, s->repo, id);
7601 			if (err) {
7602 				if (err->code != GOT_ERR_OBJ_TYPE) {
7603 					free(id);
7604 					return err;
7605 				}
7606 				err = got_object_open_as_commit(&ci, s->repo,
7607 				    id);
7608 				if (err) {
7609 					free(id);
7610 					return err;
7611 				}
7612 				t = got_object_commit_get_committer_time(ci);
7613 				got_object_commit_close(ci);
7614 			} else {
7615 				t = got_object_tag_get_tagger_time(tag);
7616 				got_object_tag_close(tag);
7617 			}
7618 			free(id);
7619 			if (gmtime_r(&t, &tm) == NULL)
7620 				return got_error_from_errno("gmtime_r");
7621 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7622 				return got_error(GOT_ERR_NO_SPACE);
7623 		}
7624 		if (got_ref_is_symbolic(re->ref)) {
7625 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7626 			    ymd : "", got_ref_get_name(re->ref),
7627 			    got_ref_get_symref_target(re->ref)) == -1)
7628 				return got_error_from_errno("asprintf");
7629 		} else if (s->show_ids) {
7630 			struct got_object_id *id;
7631 			char *id_str;
7632 			err = got_ref_resolve(&id, s->repo, re->ref);
7633 			if (err)
7634 				return err;
7635 			err = got_object_id_str(&id_str, id);
7636 			if (err) {
7637 				free(id);
7638 				return err;
7639 			}
7640 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7641 			    got_ref_get_name(re->ref), id_str) == -1) {
7642 				err = got_error_from_errno("asprintf");
7643 				free(id);
7644 				free(id_str);
7645 				return err;
7646 			}
7647 			free(id);
7648 			free(id_str);
7649 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7650 		    got_ref_get_name(re->ref)) == -1)
7651 			return got_error_from_errno("asprintf");
7652 
7653 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7654 		    0, 0);
7655 		if (err) {
7656 			free(line);
7657 			return err;
7658 		}
7659 		if (n == s->selected) {
7660 			if (view->focussed)
7661 				wstandout(view->window);
7662 			s->selected_entry = re;
7663 		}
7664 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7665 		if (tc)
7666 			wattr_on(view->window,
7667 			    COLOR_PAIR(tc->colorpair), NULL);
7668 		waddwstr(view->window, wline);
7669 		if (tc)
7670 			wattr_off(view->window,
7671 			    COLOR_PAIR(tc->colorpair), NULL);
7672 		if (width < view->ncols - 1)
7673 			waddch(view->window, '\n');
7674 		if (n == s->selected && view->focussed)
7675 			wstandend(view->window);
7676 		free(line);
7677 		free(wline);
7678 		wline = NULL;
7679 		n++;
7680 		s->ndisplayed++;
7681 		s->last_displayed_entry = re;
7682 
7683 		limit--;
7684 		re = TAILQ_NEXT(re, entry);
7685 	}
7686 
7687 	view_border(view);
7688 	return err;
7689 }
7690 
7691 static const struct got_error *
7692 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7693     struct tog_reflist_entry *re, struct got_repository *repo)
7694 {
7695 	const struct got_error *err = NULL;
7696 	struct got_object_id *commit_id = NULL;
7697 	struct tog_view *tree_view;
7698 
7699 	*new_view = NULL;
7700 
7701 	err = resolve_reflist_entry(&commit_id, re, repo);
7702 	if (err) {
7703 		if (err->code != GOT_ERR_OBJ_TYPE)
7704 			return err;
7705 		else
7706 			return NULL;
7707 	}
7708 
7709 
7710 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7711 	if (tree_view == NULL) {
7712 		err = got_error_from_errno("view_open");
7713 		goto done;
7714 	}
7715 
7716 	err = open_tree_view(tree_view, commit_id,
7717 	    got_ref_get_name(re->ref), repo);
7718 	if (err)
7719 		goto done;
7720 
7721 	*new_view = tree_view;
7722 done:
7723 	free(commit_id);
7724 	return err;
7725 }
7726 static const struct got_error *
7727 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7728 {
7729 	const struct got_error *err = NULL;
7730 	struct tog_ref_view_state *s = &view->state.ref;
7731 	struct tog_view *log_view, *tree_view;
7732 	struct tog_reflist_entry *re;
7733 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7734 
7735 	switch (ch) {
7736 	case 'i':
7737 		s->show_ids = !s->show_ids;
7738 		view->count = 0;
7739 		break;
7740 	case 'm':
7741 		s->show_date = !s->show_date;
7742 		view->count = 0;
7743 		break;
7744 	case 'o':
7745 		s->sort_by_date = !s->sort_by_date;
7746 		view->count = 0;
7747 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7748 		    got_ref_cmp_by_commit_timestamp_descending :
7749 		    tog_ref_cmp_by_name, s->repo);
7750 		if (err)
7751 			break;
7752 		got_reflist_object_id_map_free(tog_refs_idmap);
7753 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7754 		    &tog_refs, s->repo);
7755 		if (err)
7756 			break;
7757 		ref_view_free_refs(s);
7758 		err = ref_view_load_refs(s);
7759 		break;
7760 	case KEY_ENTER:
7761 	case '\r':
7762 		view->count = 0;
7763 		if (!s->selected_entry)
7764 			break;
7765 		if (view_is_parent_view(view))
7766 			view_get_split(view, &begin_y, &begin_x);
7767 
7768 		err = log_ref_entry(&log_view, begin_y, begin_x,
7769 		    s->selected_entry, s->repo);
7770 		if (err)
7771 			break;
7772 
7773 		if (view_is_parent_view(view) &&
7774 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7775 			err = view_init_hsplit(view, begin_y);
7776 			if (err)
7777 				break;
7778 		}
7779 
7780 		view->focussed = 0;
7781 		log_view->focussed = 1;
7782 		log_view->mode = view->mode;
7783 		log_view->nlines = view->lines - begin_y;
7784 		if (view_is_parent_view(view)) {
7785 			view_transfer_size(log_view, view);
7786 			err = view_close_child(view);
7787 			if (err)
7788 				return err;
7789 			err = view_set_child(view, log_view);
7790 			if (err)
7791 				return err;
7792 			view->focus_child = 1;
7793 		} else
7794 			*new_view = log_view;
7795 		break;
7796 	case 't':
7797 		view->count = 0;
7798 		if (!s->selected_entry)
7799 			break;
7800 		if (view_is_parent_view(view))
7801 			view_get_split(view, &begin_y, &begin_x);
7802 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7803 		    s->selected_entry, s->repo);
7804 		if (err || tree_view == NULL)
7805 			break;
7806 		if (view_is_parent_view(view) &&
7807 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7808 			err = view_init_hsplit(view, begin_y);
7809 			if (err)
7810 				break;
7811 		}
7812 		view->focussed = 0;
7813 		tree_view->focussed = 1;
7814 		tree_view->mode = view->mode;
7815 		tree_view->nlines = view->lines - begin_y;
7816 		if (view_is_parent_view(view)) {
7817 			view_transfer_size(tree_view, view);
7818 			err = view_close_child(view);
7819 			if (err)
7820 				return err;
7821 			err = view_set_child(view, tree_view);
7822 			if (err)
7823 				return err;
7824 			view->focus_child = 1;
7825 		} else
7826 			*new_view = tree_view;
7827 		break;
7828 	case 'g':
7829 	case KEY_HOME:
7830 		s->selected = 0;
7831 		view->count = 0;
7832 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7833 		break;
7834 	case 'G':
7835 	case KEY_END: {
7836 		int eos = view->nlines - 1;
7837 
7838 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7839 			--eos;  /* border */
7840 		s->selected = 0;
7841 		view->count = 0;
7842 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7843 		for (n = 0; n < eos; n++) {
7844 			if (re == NULL)
7845 				break;
7846 			s->first_displayed_entry = re;
7847 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7848 		}
7849 		if (n > 0)
7850 			s->selected = n - 1;
7851 		break;
7852 	}
7853 	case 'k':
7854 	case KEY_UP:
7855 	case CTRL('p'):
7856 		if (s->selected > 0) {
7857 			s->selected--;
7858 			break;
7859 		}
7860 		ref_scroll_up(s, 1);
7861 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7862 			view->count = 0;
7863 		break;
7864 	case CTRL('u'):
7865 	case 'u':
7866 		nscroll /= 2;
7867 		/* FALL THROUGH */
7868 	case KEY_PPAGE:
7869 	case CTRL('b'):
7870 	case 'b':
7871 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7872 			s->selected -= MIN(nscroll, s->selected);
7873 		ref_scroll_up(s, MAX(0, nscroll));
7874 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7875 			view->count = 0;
7876 		break;
7877 	case 'j':
7878 	case KEY_DOWN:
7879 	case CTRL('n'):
7880 		if (s->selected < s->ndisplayed - 1) {
7881 			s->selected++;
7882 			break;
7883 		}
7884 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7885 			/* can't scroll any further */
7886 			view->count = 0;
7887 			break;
7888 		}
7889 		ref_scroll_down(view, 1);
7890 		break;
7891 	case CTRL('d'):
7892 	case 'd':
7893 		nscroll /= 2;
7894 		/* FALL THROUGH */
7895 	case KEY_NPAGE:
7896 	case CTRL('f'):
7897 	case 'f':
7898 	case ' ':
7899 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7900 			/* can't scroll any further; move cursor down */
7901 			if (s->selected < s->ndisplayed - 1)
7902 				s->selected += MIN(nscroll,
7903 				    s->ndisplayed - s->selected - 1);
7904 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7905 				s->selected += s->ndisplayed - s->selected - 1;
7906 			view->count = 0;
7907 			break;
7908 		}
7909 		ref_scroll_down(view, nscroll);
7910 		break;
7911 	case CTRL('l'):
7912 		view->count = 0;
7913 		tog_free_refs();
7914 		err = tog_load_refs(s->repo, s->sort_by_date);
7915 		if (err)
7916 			break;
7917 		ref_view_free_refs(s);
7918 		err = ref_view_load_refs(s);
7919 		break;
7920 	case KEY_RESIZE:
7921 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7922 			s->selected = view->nlines - 2;
7923 		break;
7924 	default:
7925 		view->count = 0;
7926 		break;
7927 	}
7928 
7929 	return err;
7930 }
7931 
7932 __dead static void
7933 usage_ref(void)
7934 {
7935 	endwin();
7936 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7937 	    getprogname());
7938 	exit(1);
7939 }
7940 
7941 static const struct got_error *
7942 cmd_ref(int argc, char *argv[])
7943 {
7944 	const struct got_error *error;
7945 	struct got_repository *repo = NULL;
7946 	struct got_worktree *worktree = NULL;
7947 	char *cwd = NULL, *repo_path = NULL;
7948 	int ch;
7949 	struct tog_view *view;
7950 	int *pack_fds = NULL;
7951 
7952 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7953 		switch (ch) {
7954 		case 'r':
7955 			repo_path = realpath(optarg, NULL);
7956 			if (repo_path == NULL)
7957 				return got_error_from_errno2("realpath",
7958 				    optarg);
7959 			break;
7960 		default:
7961 			usage_ref();
7962 			/* NOTREACHED */
7963 		}
7964 	}
7965 
7966 	argc -= optind;
7967 	argv += optind;
7968 
7969 	if (argc > 1)
7970 		usage_ref();
7971 
7972 	error = got_repo_pack_fds_open(&pack_fds);
7973 	if (error != NULL)
7974 		goto done;
7975 
7976 	if (repo_path == NULL) {
7977 		cwd = getcwd(NULL, 0);
7978 		if (cwd == NULL)
7979 			return got_error_from_errno("getcwd");
7980 		error = got_worktree_open(&worktree, cwd);
7981 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7982 			goto done;
7983 		if (worktree)
7984 			repo_path =
7985 			    strdup(got_worktree_get_repo_path(worktree));
7986 		else
7987 			repo_path = strdup(cwd);
7988 		if (repo_path == NULL) {
7989 			error = got_error_from_errno("strdup");
7990 			goto done;
7991 		}
7992 	}
7993 
7994 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7995 	if (error != NULL)
7996 		goto done;
7997 
7998 	init_curses();
7999 
8000 	error = apply_unveil(got_repo_get_path(repo), NULL);
8001 	if (error)
8002 		goto done;
8003 
8004 	error = tog_load_refs(repo, 0);
8005 	if (error)
8006 		goto done;
8007 
8008 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8009 	if (view == NULL) {
8010 		error = got_error_from_errno("view_open");
8011 		goto done;
8012 	}
8013 
8014 	error = open_ref_view(view, repo);
8015 	if (error)
8016 		goto done;
8017 
8018 	if (worktree) {
8019 		/* Release work tree lock. */
8020 		got_worktree_close(worktree);
8021 		worktree = NULL;
8022 	}
8023 	error = view_loop(view);
8024 done:
8025 	free(repo_path);
8026 	free(cwd);
8027 	if (repo) {
8028 		const struct got_error *close_err = got_repo_close(repo);
8029 		if (close_err)
8030 			error = close_err;
8031 	}
8032 	if (pack_fds) {
8033 		const struct got_error *pack_err =
8034 		    got_repo_pack_fds_close(pack_fds);
8035 		if (error == NULL)
8036 			error = pack_err;
8037 	}
8038 	tog_free_refs();
8039 	return error;
8040 }
8041 
8042 /*
8043  * If view was scrolled down to move the selected line into view when opening a
8044  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8045  */
8046 static void
8047 offset_selection_up(struct tog_view *view)
8048 {
8049 	switch (view->type) {
8050 	case TOG_VIEW_BLAME: {
8051 		struct tog_blame_view_state *s = &view->state.blame;
8052 		if (s->first_displayed_line == 1) {
8053 			s->selected_line = MAX(s->selected_line - view->offset,
8054 			    1);
8055 			break;
8056 		}
8057 		if (s->first_displayed_line > view->offset)
8058 			s->first_displayed_line -= view->offset;
8059 		else
8060 			s->first_displayed_line = 1;
8061 		s->selected_line += view->offset;
8062 		break;
8063 	}
8064 	case TOG_VIEW_LOG:
8065 		log_scroll_up(&view->state.log, view->offset);
8066 		view->state.log.selected += view->offset;
8067 		break;
8068 	case TOG_VIEW_REF:
8069 		ref_scroll_up(&view->state.ref, view->offset);
8070 		view->state.ref.selected += view->offset;
8071 		break;
8072 	case TOG_VIEW_TREE:
8073 		tree_scroll_up(&view->state.tree, view->offset);
8074 		view->state.tree.selected += view->offset;
8075 		break;
8076 	default:
8077 		break;
8078 	}
8079 
8080 	view->offset = 0;
8081 }
8082 
8083 /*
8084  * If the selected line is in the section of screen covered by the bottom split,
8085  * scroll down offset lines to move it into view and index its new position.
8086  */
8087 static const struct got_error *
8088 offset_selection_down(struct tog_view *view)
8089 {
8090 	const struct got_error	*err = NULL;
8091 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8092 	int			*selected = NULL;
8093 	int			 header, offset;
8094 
8095 	switch (view->type) {
8096 	case TOG_VIEW_BLAME: {
8097 		struct tog_blame_view_state *s = &view->state.blame;
8098 		header = 3;
8099 		scrolld = NULL;
8100 		if (s->selected_line > view->nlines - header) {
8101 			offset = abs(view->nlines - s->selected_line - header);
8102 			s->first_displayed_line += offset;
8103 			s->selected_line -= offset;
8104 			view->offset = offset;
8105 		}
8106 		break;
8107 	}
8108 	case TOG_VIEW_LOG: {
8109 		struct tog_log_view_state *s = &view->state.log;
8110 		scrolld = &log_scroll_down;
8111 		header = view_is_parent_view(view) ? 3 : 2;
8112 		selected = &s->selected;
8113 		break;
8114 	}
8115 	case TOG_VIEW_REF: {
8116 		struct tog_ref_view_state *s = &view->state.ref;
8117 		scrolld = &ref_scroll_down;
8118 		header = 3;
8119 		selected = &s->selected;
8120 		break;
8121 	}
8122 	case TOG_VIEW_TREE: {
8123 		struct tog_tree_view_state *s = &view->state.tree;
8124 		scrolld = &tree_scroll_down;
8125 		header = 5;
8126 		selected = &s->selected;
8127 		break;
8128 	}
8129 	default:
8130 		selected = NULL;
8131 		scrolld = NULL;
8132 		header = 0;
8133 		break;
8134 	}
8135 
8136 	if (selected && *selected > view->nlines - header) {
8137 		offset = abs(view->nlines - *selected - header);
8138 		view->offset = offset;
8139 		if (scrolld && offset) {
8140 			err = scrolld(view, offset);
8141 			*selected -= offset;
8142 		}
8143 	}
8144 
8145 	return err;
8146 }
8147 
8148 static void
8149 list_commands(FILE *fp)
8150 {
8151 	size_t i;
8152 
8153 	fprintf(fp, "commands:");
8154 	for (i = 0; i < nitems(tog_commands); i++) {
8155 		const struct tog_cmd *cmd = &tog_commands[i];
8156 		fprintf(fp, " %s", cmd->name);
8157 	}
8158 	fputc('\n', fp);
8159 }
8160 
8161 __dead static void
8162 usage(int hflag, int status)
8163 {
8164 	FILE *fp = (status == 0) ? stdout : stderr;
8165 
8166 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8167 	    getprogname());
8168 	if (hflag) {
8169 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8170 		list_commands(fp);
8171 	}
8172 	exit(status);
8173 }
8174 
8175 static char **
8176 make_argv(int argc, ...)
8177 {
8178 	va_list ap;
8179 	char **argv;
8180 	int i;
8181 
8182 	va_start(ap, argc);
8183 
8184 	argv = calloc(argc, sizeof(char *));
8185 	if (argv == NULL)
8186 		err(1, "calloc");
8187 	for (i = 0; i < argc; i++) {
8188 		argv[i] = strdup(va_arg(ap, char *));
8189 		if (argv[i] == NULL)
8190 			err(1, "strdup");
8191 	}
8192 
8193 	va_end(ap);
8194 	return argv;
8195 }
8196 
8197 /*
8198  * Try to convert 'tog path' into a 'tog log path' command.
8199  * The user could simply have mistyped the command rather than knowingly
8200  * provided a path. So check whether argv[0] can in fact be resolved
8201  * to a path in the HEAD commit and print a special error if not.
8202  * This hack is for mpi@ <3
8203  */
8204 static const struct got_error *
8205 tog_log_with_path(int argc, char *argv[])
8206 {
8207 	const struct got_error *error = NULL, *close_err;
8208 	const struct tog_cmd *cmd = NULL;
8209 	struct got_repository *repo = NULL;
8210 	struct got_worktree *worktree = NULL;
8211 	struct got_object_id *commit_id = NULL, *id = NULL;
8212 	struct got_commit_object *commit = NULL;
8213 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8214 	char *commit_id_str = NULL, **cmd_argv = NULL;
8215 	int *pack_fds = NULL;
8216 
8217 	cwd = getcwd(NULL, 0);
8218 	if (cwd == NULL)
8219 		return got_error_from_errno("getcwd");
8220 
8221 	error = got_repo_pack_fds_open(&pack_fds);
8222 	if (error != NULL)
8223 		goto done;
8224 
8225 	error = got_worktree_open(&worktree, cwd);
8226 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8227 		goto done;
8228 
8229 	if (worktree)
8230 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8231 	else
8232 		repo_path = strdup(cwd);
8233 	if (repo_path == NULL) {
8234 		error = got_error_from_errno("strdup");
8235 		goto done;
8236 	}
8237 
8238 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8239 	if (error != NULL)
8240 		goto done;
8241 
8242 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8243 	    repo, worktree);
8244 	if (error)
8245 		goto done;
8246 
8247 	error = tog_load_refs(repo, 0);
8248 	if (error)
8249 		goto done;
8250 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8251 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8252 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8253 	if (error)
8254 		goto done;
8255 
8256 	if (worktree) {
8257 		got_worktree_close(worktree);
8258 		worktree = NULL;
8259 	}
8260 
8261 	error = got_object_open_as_commit(&commit, repo, commit_id);
8262 	if (error)
8263 		goto done;
8264 
8265 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8266 	if (error) {
8267 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8268 			goto done;
8269 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8270 		    getprogname(), argv[0]);
8271 		usage(1, 1);
8272 		/* not reached */
8273 	}
8274 
8275 	close_err = got_repo_close(repo);
8276 	if (error == NULL)
8277 		error = close_err;
8278 	repo = NULL;
8279 
8280 	error = got_object_id_str(&commit_id_str, commit_id);
8281 	if (error)
8282 		goto done;
8283 
8284 	cmd = &tog_commands[0]; /* log */
8285 	argc = 4;
8286 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8287 	error = cmd->cmd_main(argc, cmd_argv);
8288 done:
8289 	if (repo) {
8290 		close_err = got_repo_close(repo);
8291 		if (error == NULL)
8292 			error = close_err;
8293 	}
8294 	if (commit)
8295 		got_object_commit_close(commit);
8296 	if (worktree)
8297 		got_worktree_close(worktree);
8298 	if (pack_fds) {
8299 		const struct got_error *pack_err =
8300 		    got_repo_pack_fds_close(pack_fds);
8301 		if (error == NULL)
8302 			error = pack_err;
8303 	}
8304 	free(id);
8305 	free(commit_id_str);
8306 	free(commit_id);
8307 	free(cwd);
8308 	free(repo_path);
8309 	free(in_repo_path);
8310 	if (cmd_argv) {
8311 		int i;
8312 		for (i = 0; i < argc; i++)
8313 			free(cmd_argv[i]);
8314 		free(cmd_argv);
8315 	}
8316 	tog_free_refs();
8317 	return error;
8318 }
8319 
8320 int
8321 main(int argc, char *argv[])
8322 {
8323 	const struct got_error *error = NULL;
8324 	const struct tog_cmd *cmd = NULL;
8325 	int ch, hflag = 0, Vflag = 0;
8326 	char **cmd_argv = NULL;
8327 	static const struct option longopts[] = {
8328 	    { "version", no_argument, NULL, 'V' },
8329 	    { NULL, 0, NULL, 0}
8330 	};
8331 	char *diff_algo_str = NULL;
8332 
8333 	setlocale(LC_CTYPE, "");
8334 
8335 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8336 		switch (ch) {
8337 		case 'h':
8338 			hflag = 1;
8339 			break;
8340 		case 'V':
8341 			Vflag = 1;
8342 			break;
8343 		default:
8344 			usage(hflag, 1);
8345 			/* NOTREACHED */
8346 		}
8347 	}
8348 
8349 	argc -= optind;
8350 	argv += optind;
8351 	optind = 1;
8352 	optreset = 1;
8353 
8354 	if (Vflag) {
8355 		got_version_print_str();
8356 		return 0;
8357 	}
8358 
8359 #ifndef PROFILE
8360 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8361 	    NULL) == -1)
8362 		err(1, "pledge");
8363 #endif
8364 
8365 	if (argc == 0) {
8366 		if (hflag)
8367 			usage(hflag, 0);
8368 		/* Build an argument vector which runs a default command. */
8369 		cmd = &tog_commands[0];
8370 		argc = 1;
8371 		cmd_argv = make_argv(argc, cmd->name);
8372 	} else {
8373 		size_t i;
8374 
8375 		/* Did the user specify a command? */
8376 		for (i = 0; i < nitems(tog_commands); i++) {
8377 			if (strncmp(tog_commands[i].name, argv[0],
8378 			    strlen(argv[0])) == 0) {
8379 				cmd = &tog_commands[i];
8380 				break;
8381 			}
8382 		}
8383 	}
8384 
8385 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8386 	if (diff_algo_str) {
8387 		if (strcasecmp(diff_algo_str, "patience") == 0)
8388 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8389 		if (strcasecmp(diff_algo_str, "myers") == 0)
8390 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8391 	}
8392 
8393 	if (cmd == NULL) {
8394 		if (argc != 1)
8395 			usage(0, 1);
8396 		/* No command specified; try log with a path */
8397 		error = tog_log_with_path(argc, argv);
8398 	} else {
8399 		if (hflag)
8400 			cmd->cmd_usage();
8401 		else
8402 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8403 	}
8404 
8405 	endwin();
8406 	putchar('\n');
8407 	if (cmd_argv) {
8408 		int i;
8409 		for (i = 0; i < argc; i++)
8410 			free(cmd_argv[i]);
8411 		free(cmd_argv);
8412 	}
8413 
8414 	if (error && error->code != GOT_ERR_CANCELLED)
8415 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8416 	return 0;
8417 }