1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 enum tog_view_mode {
109 	TOG_VIEW_SPLIT_NONE,
110 	TOG_VIEW_SPLIT_VERT,
111 	TOG_VIEW_SPLIT_HRZN
112 };
113 
114 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
115 
116 #define TOG_EOF_STRING	"(END)"
117 
118 struct commit_queue_entry {
119 	TAILQ_ENTRY(commit_queue_entry) entry;
120 	struct got_object_id *id;
121 	struct got_commit_object *commit;
122 	int idx;
123 };
124 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
125 struct commit_queue {
126 	int ncommits;
127 	struct commit_queue_head head;
128 };
129 
130 struct tog_color {
131 	STAILQ_ENTRY(tog_color) entry;
132 	regex_t regex;
133 	short colorpair;
134 };
135 STAILQ_HEAD(tog_colors, tog_color);
136 
137 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
138 static struct got_reflist_object_id_map *tog_refs_idmap;
139 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
140 
141 static const struct got_error *
142 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
143     struct got_reference* re2)
144 {
145 	const char *name1 = got_ref_get_name(re1);
146 	const char *name2 = got_ref_get_name(re2);
147 	int isbackup1, isbackup2;
148 
149 	/* Sort backup refs towards the bottom of the list. */
150 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
151 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
152 	if (!isbackup1 && isbackup2) {
153 		*cmp = -1;
154 		return NULL;
155 	} else if (isbackup1 && !isbackup2) {
156 		*cmp = 1;
157 		return NULL;
158 	}
159 
160 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
161 	return NULL;
162 }
163 
164 static const struct got_error *
165 tog_load_refs(struct got_repository *repo, int sort_by_date)
166 {
167 	const struct got_error *err;
168 
169 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
170 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
171 	    repo);
172 	if (err)
173 		return err;
174 
175 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
176 	    repo);
177 }
178 
179 static void
180 tog_free_refs(void)
181 {
182 	if (tog_refs_idmap) {
183 		got_reflist_object_id_map_free(tog_refs_idmap);
184 		tog_refs_idmap = NULL;
185 	}
186 	got_ref_list_free(&tog_refs);
187 }
188 
189 static const struct got_error *
190 add_color(struct tog_colors *colors, const char *pattern,
191     int idx, short color)
192 {
193 	const struct got_error *err = NULL;
194 	struct tog_color *tc;
195 	int regerr = 0;
196 
197 	if (idx < 1 || idx > COLOR_PAIRS - 1)
198 		return NULL;
199 
200 	init_pair(idx, color, -1);
201 
202 	tc = calloc(1, sizeof(*tc));
203 	if (tc == NULL)
204 		return got_error_from_errno("calloc");
205 	regerr = regcomp(&tc->regex, pattern,
206 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
207 	if (regerr) {
208 		static char regerr_msg[512];
209 		static char err_msg[512];
210 		regerror(regerr, &tc->regex, regerr_msg,
211 		    sizeof(regerr_msg));
212 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
213 		    regerr_msg);
214 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
215 		free(tc);
216 		return err;
217 	}
218 	tc->colorpair = idx;
219 	STAILQ_INSERT_HEAD(colors, tc, entry);
220 	return NULL;
221 }
222 
223 static void
224 free_colors(struct tog_colors *colors)
225 {
226 	struct tog_color *tc;
227 
228 	while (!STAILQ_EMPTY(colors)) {
229 		tc = STAILQ_FIRST(colors);
230 		STAILQ_REMOVE_HEAD(colors, entry);
231 		regfree(&tc->regex);
232 		free(tc);
233 	}
234 }
235 
236 static struct tog_color *
237 get_color(struct tog_colors *colors, int colorpair)
238 {
239 	struct tog_color *tc = NULL;
240 
241 	STAILQ_FOREACH(tc, colors, entry) {
242 		if (tc->colorpair == colorpair)
243 			return tc;
244 	}
245 
246 	return NULL;
247 }
248 
249 static int
250 default_color_value(const char *envvar)
251 {
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
253 		return COLOR_MAGENTA;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
255 		return COLOR_CYAN;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
257 		return COLOR_YELLOW;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
259 		return COLOR_GREEN;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
263 		return COLOR_MAGENTA;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
265 		return COLOR_CYAN;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
269 		return COLOR_GREEN;
270 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
271 		return COLOR_CYAN;
272 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
273 		return COLOR_YELLOW;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
275 		return COLOR_GREEN;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
279 		return COLOR_YELLOW;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
281 		return COLOR_CYAN;
282 
283 	return -1;
284 }
285 
286 static int
287 get_color_value(const char *envvar)
288 {
289 	const char *val = getenv(envvar);
290 
291 	if (val == NULL)
292 		return default_color_value(envvar);
293 
294 	if (strcasecmp(val, "black") == 0)
295 		return COLOR_BLACK;
296 	if (strcasecmp(val, "red") == 0)
297 		return COLOR_RED;
298 	if (strcasecmp(val, "green") == 0)
299 		return COLOR_GREEN;
300 	if (strcasecmp(val, "yellow") == 0)
301 		return COLOR_YELLOW;
302 	if (strcasecmp(val, "blue") == 0)
303 		return COLOR_BLUE;
304 	if (strcasecmp(val, "magenta") == 0)
305 		return COLOR_MAGENTA;
306 	if (strcasecmp(val, "cyan") == 0)
307 		return COLOR_CYAN;
308 	if (strcasecmp(val, "white") == 0)
309 		return COLOR_WHITE;
310 	if (strcasecmp(val, "default") == 0)
311 		return -1;
312 
313 	return default_color_value(envvar);
314 }
315 
316 
317 struct tog_diff_view_state {
318 	struct got_object_id *id1, *id2;
319 	const char *label1, *label2;
320 	FILE *f, *f1, *f2;
321 	int fd1, fd2;
322 	int first_displayed_line;
323 	int last_displayed_line;
324 	int eof;
325 	int diff_context;
326 	int ignore_whitespace;
327 	int force_text_diff;
328 	struct got_repository *repo;
329 	struct tog_colors colors;
330 	size_t nlines;
331 	off_t *line_offsets;
332 	int matched_line;
333 	int selected_line;
334 
335 	/* passed from log or blame view; may be NULL */
336 	struct tog_view *parent_view;
337 };
338 
339 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
340 static volatile sig_atomic_t tog_thread_error;
341 
342 struct tog_log_thread_args {
343 	pthread_cond_t need_commits;
344 	pthread_cond_t commit_loaded;
345 	int commits_needed;
346 	int load_all;
347 	struct got_commit_graph *graph;
348 	struct commit_queue *commits;
349 	const char *in_repo_path;
350 	struct got_object_id *start_id;
351 	struct got_repository *repo;
352 	int *pack_fds;
353 	int log_complete;
354 	sig_atomic_t *quit;
355 	struct commit_queue_entry **first_displayed_entry;
356 	struct commit_queue_entry **selected_entry;
357 	int *searching;
358 	int *search_next_done;
359 	regex_t *regex;
360 };
361 
362 struct tog_log_view_state {
363 	struct commit_queue commits;
364 	struct commit_queue_entry *first_displayed_entry;
365 	struct commit_queue_entry *last_displayed_entry;
366 	struct commit_queue_entry *selected_entry;
367 	int selected;
368 	char *in_repo_path;
369 	char *head_ref_name;
370 	int log_branches;
371 	struct got_repository *repo;
372 	struct got_object_id *start_id;
373 	sig_atomic_t quit;
374 	pthread_t thread;
375 	struct tog_log_thread_args thread_args;
376 	struct commit_queue_entry *matched_entry;
377 	struct commit_queue_entry *search_entry;
378 	struct tog_colors colors;
379 	int use_committer;
380 };
381 
382 #define TOG_COLOR_DIFF_MINUS		1
383 #define TOG_COLOR_DIFF_PLUS		2
384 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
385 #define TOG_COLOR_DIFF_META		4
386 #define TOG_COLOR_TREE_SUBMODULE	5
387 #define TOG_COLOR_TREE_SYMLINK		6
388 #define TOG_COLOR_TREE_DIRECTORY	7
389 #define TOG_COLOR_TREE_EXECUTABLE	8
390 #define TOG_COLOR_COMMIT		9
391 #define TOG_COLOR_AUTHOR		10
392 #define TOG_COLOR_DATE			11
393 #define TOG_COLOR_REFS_HEADS		12
394 #define TOG_COLOR_REFS_TAGS		13
395 #define TOG_COLOR_REFS_REMOTES		14
396 #define TOG_COLOR_REFS_BACKUP		15
397 
398 struct tog_blame_cb_args {
399 	struct tog_blame_line *lines; /* one per line */
400 	int nlines;
401 
402 	struct tog_view *view;
403 	struct got_object_id *commit_id;
404 	int *quit;
405 };
406 
407 struct tog_blame_thread_args {
408 	const char *path;
409 	struct got_repository *repo;
410 	struct tog_blame_cb_args *cb_args;
411 	int *complete;
412 	got_cancel_cb cancel_cb;
413 	void *cancel_arg;
414 };
415 
416 struct tog_blame {
417 	FILE *f;
418 	off_t filesize;
419 	struct tog_blame_line *lines;
420 	int nlines;
421 	off_t *line_offsets;
422 	pthread_t thread;
423 	struct tog_blame_thread_args thread_args;
424 	struct tog_blame_cb_args cb_args;
425 	const char *path;
426 	int *pack_fds;
427 };
428 
429 struct tog_blame_view_state {
430 	int first_displayed_line;
431 	int last_displayed_line;
432 	int selected_line;
433 	int last_diffed_line;
434 	int blame_complete;
435 	int eof;
436 	int done;
437 	struct got_object_id_queue blamed_commits;
438 	struct got_object_qid *blamed_commit;
439 	char *path;
440 	struct got_repository *repo;
441 	struct got_object_id *commit_id;
442 	struct tog_blame blame;
443 	int matched_line;
444 	struct tog_colors colors;
445 };
446 
447 struct tog_parent_tree {
448 	TAILQ_ENTRY(tog_parent_tree) entry;
449 	struct got_tree_object *tree;
450 	struct got_tree_entry *first_displayed_entry;
451 	struct got_tree_entry *selected_entry;
452 	int selected;
453 };
454 
455 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
456 
457 struct tog_tree_view_state {
458 	char *tree_label;
459 	struct got_object_id *commit_id;/* commit which this tree belongs to */
460 	struct got_tree_object *root;	/* the commit's root tree entry */
461 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
462 	struct got_tree_entry *first_displayed_entry;
463 	struct got_tree_entry *last_displayed_entry;
464 	struct got_tree_entry *selected_entry;
465 	int ndisplayed, selected, show_ids;
466 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
467 	char *head_ref_name;
468 	struct got_repository *repo;
469 	struct got_tree_entry *matched_entry;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_reflist_entry {
474 	TAILQ_ENTRY(tog_reflist_entry) entry;
475 	struct got_reference *ref;
476 	int idx;
477 };
478 
479 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
480 
481 struct tog_ref_view_state {
482 	struct tog_reflist_head refs;
483 	struct tog_reflist_entry *first_displayed_entry;
484 	struct tog_reflist_entry *last_displayed_entry;
485 	struct tog_reflist_entry *selected_entry;
486 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
487 	struct got_repository *repo;
488 	struct tog_reflist_entry *matched_entry;
489 	struct tog_colors colors;
490 };
491 
492 /*
493  * We implement two types of views: parent views and child views.
494  *
495  * The 'Tab' key switches focus between a parent view and its child view.
496  * Child views are shown side-by-side to their parent view, provided
497  * there is enough screen estate.
498  *
499  * When a new view is opened from within a parent view, this new view
500  * becomes a child view of the parent view, replacing any existing child.
501  *
502  * When a new view is opened from within a child view, this new view
503  * becomes a parent view which will obscure the views below until the
504  * user quits the new parent view by typing 'q'.
505  *
506  * This list of views contains parent views only.
507  * Child views are only pointed to by their parent view.
508  */
509 TAILQ_HEAD(tog_view_list_head, tog_view);
510 
511 struct tog_view {
512 	TAILQ_ENTRY(tog_view) entry;
513 	WINDOW *window;
514 	PANEL *panel;
515 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
516 	int resized_y, resized_x; /* begin_y/x based on user resizing */
517 	int maxx, x; /* max column and current start column */
518 	int lines, cols; /* copies of LINES and COLS */
519 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
520 	int ch, count; /* current keymap and count prefix */
521 	int resized; /* set when in a resize event */
522 	int focussed; /* Only set on one parent or child view at a time. */
523 	int dying;
524 	struct tog_view *parent;
525 	struct tog_view *child;
526 
527 	/*
528 	 * This flag is initially set on parent views when a new child view
529 	 * is created. It gets toggled when the 'Tab' key switches focus
530 	 * between parent and child.
531 	 * The flag indicates whether focus should be passed on to our child
532 	 * view if this parent view gets picked for focus after another parent
533 	 * view was closed. This prevents child views from losing focus in such
534 	 * situations.
535 	 */
536 	int focus_child;
537 
538 	enum tog_view_mode mode;
539 	/* type-specific state */
540 	enum tog_view_type type;
541 	union {
542 		struct tog_diff_view_state diff;
543 		struct tog_log_view_state log;
544 		struct tog_blame_view_state blame;
545 		struct tog_tree_view_state tree;
546 		struct tog_ref_view_state ref;
547 	} state;
548 
549 	const struct got_error *(*show)(struct tog_view *);
550 	const struct got_error *(*input)(struct tog_view **,
551 	    struct tog_view *, int);
552 	const struct got_error *(*reset)(struct tog_view *);
553 	const struct got_error *(*resize)(struct tog_view *, int);
554 	const struct got_error *(*close)(struct tog_view *);
555 
556 	const struct got_error *(*search_start)(struct tog_view *);
557 	const struct got_error *(*search_next)(struct tog_view *);
558 	int search_started;
559 	int searching;
560 #define TOG_SEARCH_FORWARD	1
561 #define TOG_SEARCH_BACKWARD	2
562 	int search_next_done;
563 #define TOG_SEARCH_HAVE_MORE	1
564 #define TOG_SEARCH_NO_MORE	2
565 #define TOG_SEARCH_HAVE_NONE	3
566 	regex_t regex;
567 	regmatch_t regmatch;
568 };
569 
570 static const struct got_error *open_diff_view(struct tog_view *,
571     struct got_object_id *, struct got_object_id *,
572     const char *, const char *, int, int, int, struct tog_view *,
573     struct got_repository *);
574 static const struct got_error *show_diff_view(struct tog_view *);
575 static const struct got_error *input_diff_view(struct tog_view **,
576     struct tog_view *, int);
577 static const struct got_error *reset_diff_view(struct tog_view *);
578 static const struct got_error* close_diff_view(struct tog_view *);
579 static const struct got_error *search_start_diff_view(struct tog_view *);
580 static const struct got_error *search_next_diff_view(struct tog_view *);
581 
582 static const struct got_error *open_log_view(struct tog_view *,
583     struct got_object_id *, struct got_repository *,
584     const char *, const char *, int);
585 static const struct got_error * show_log_view(struct tog_view *);
586 static const struct got_error *input_log_view(struct tog_view **,
587     struct tog_view *, int);
588 static const struct got_error *resize_log_view(struct tog_view *, int);
589 static const struct got_error *close_log_view(struct tog_view *);
590 static const struct got_error *search_start_log_view(struct tog_view *);
591 static const struct got_error *search_next_log_view(struct tog_view *);
592 
593 static const struct got_error *open_blame_view(struct tog_view *, char *,
594     struct got_object_id *, struct got_repository *);
595 static const struct got_error *show_blame_view(struct tog_view *);
596 static const struct got_error *input_blame_view(struct tog_view **,
597     struct tog_view *, int);
598 static const struct got_error *reset_blame_view(struct tog_view *);
599 static const struct got_error *close_blame_view(struct tog_view *);
600 static const struct got_error *search_start_blame_view(struct tog_view *);
601 static const struct got_error *search_next_blame_view(struct tog_view *);
602 
603 static const struct got_error *open_tree_view(struct tog_view *,
604     struct got_object_id *, const char *, struct got_repository *);
605 static const struct got_error *show_tree_view(struct tog_view *);
606 static const struct got_error *input_tree_view(struct tog_view **,
607     struct tog_view *, int);
608 static const struct got_error *close_tree_view(struct tog_view *);
609 static const struct got_error *search_start_tree_view(struct tog_view *);
610 static const struct got_error *search_next_tree_view(struct tog_view *);
611 
612 static const struct got_error *open_ref_view(struct tog_view *,
613     struct got_repository *);
614 static const struct got_error *show_ref_view(struct tog_view *);
615 static const struct got_error *input_ref_view(struct tog_view **,
616     struct tog_view *, int);
617 static const struct got_error *close_ref_view(struct tog_view *);
618 static const struct got_error *search_start_ref_view(struct tog_view *);
619 static const struct got_error *search_next_ref_view(struct tog_view *);
620 
621 static volatile sig_atomic_t tog_sigwinch_received;
622 static volatile sig_atomic_t tog_sigpipe_received;
623 static volatile sig_atomic_t tog_sigcont_received;
624 static volatile sig_atomic_t tog_sigint_received;
625 static volatile sig_atomic_t tog_sigterm_received;
626 
627 static void
628 tog_sigwinch(int signo)
629 {
630 	tog_sigwinch_received = 1;
631 }
632 
633 static void
634 tog_sigpipe(int signo)
635 {
636 	tog_sigpipe_received = 1;
637 }
638 
639 static void
640 tog_sigcont(int signo)
641 {
642 	tog_sigcont_received = 1;
643 }
644 
645 static void
646 tog_sigint(int signo)
647 {
648 	tog_sigint_received = 1;
649 }
650 
651 static void
652 tog_sigterm(int signo)
653 {
654 	tog_sigterm_received = 1;
655 }
656 
657 static int
658 tog_fatal_signal_received(void)
659 {
660 	return (tog_sigpipe_received ||
661 	    tog_sigint_received || tog_sigint_received);
662 }
663 
664 static const struct got_error *
665 view_close(struct tog_view *view)
666 {
667 	const struct got_error *err = NULL, *child_err = NULL;
668 
669 	if (view->child) {
670 		child_err = view_close(view->child);
671 		view->child = NULL;
672 	}
673 	if (view->close)
674 		err = view->close(view);
675 	if (view->panel)
676 		del_panel(view->panel);
677 	if (view->window)
678 		delwin(view->window);
679 	free(view);
680 	return err ? err : child_err;
681 }
682 
683 static struct tog_view *
684 view_open(int nlines, int ncols, int begin_y, int begin_x,
685     enum tog_view_type type)
686 {
687 	struct tog_view *view = calloc(1, sizeof(*view));
688 
689 	if (view == NULL)
690 		return NULL;
691 
692 	view->type = type;
693 	view->lines = LINES;
694 	view->cols = COLS;
695 	view->nlines = nlines ? nlines : LINES - begin_y;
696 	view->ncols = ncols ? ncols : COLS - begin_x;
697 	view->begin_y = begin_y;
698 	view->begin_x = begin_x;
699 	view->window = newwin(nlines, ncols, begin_y, begin_x);
700 	if (view->window == NULL) {
701 		view_close(view);
702 		return NULL;
703 	}
704 	view->panel = new_panel(view->window);
705 	if (view->panel == NULL ||
706 	    set_panel_userptr(view->panel, view) != OK) {
707 		view_close(view);
708 		return NULL;
709 	}
710 
711 	keypad(view->window, TRUE);
712 	return view;
713 }
714 
715 static int
716 view_split_begin_x(int begin_x)
717 {
718 	if (begin_x > 0 || COLS < 120)
719 		return 0;
720 	return (COLS - MAX(COLS / 2, 80));
721 }
722 
723 /* XXX Stub till we decide what to do. */
724 static int
725 view_split_begin_y(int lines)
726 {
727 	return lines * HSPLIT_SCALE;
728 }
729 
730 static const struct got_error *view_resize(struct tog_view *);
731 
732 static const struct got_error *
733 view_splitscreen(struct tog_view *view)
734 {
735 	const struct got_error *err = NULL;
736 
737 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
738 		if (view->resized_y && view->resized_y < view->lines)
739 			view->begin_y = view->resized_y;
740 		else
741 			view->begin_y = view_split_begin_y(view->nlines);
742 		view->begin_x = 0;
743 	} else if (!view->resized) {
744 		if (view->resized_x && view->resized_x < view->cols - 1 &&
745 		    view->cols > 119)
746 			view->begin_x = view->resized_x;
747 		else
748 			view->begin_x = view_split_begin_x(0);
749 		view->begin_y = 0;
750 	}
751 	view->nlines = LINES - view->begin_y;
752 	view->ncols = COLS - view->begin_x;
753 	view->lines = LINES;
754 	view->cols = COLS;
755 	err = view_resize(view);
756 	if (err)
757 		return err;
758 
759 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
760 		view->parent->nlines = view->begin_y;
761 
762 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
763 		return got_error_from_errno("mvwin");
764 
765 	return NULL;
766 }
767 
768 static const struct got_error *
769 view_fullscreen(struct tog_view *view)
770 {
771 	const struct got_error *err = NULL;
772 
773 	view->begin_x = 0;
774 	view->begin_y = view->resized ? view->begin_y : 0;
775 	view->nlines = view->resized ? view->nlines : LINES;
776 	view->ncols = COLS;
777 	view->lines = LINES;
778 	view->cols = COLS;
779 	err = view_resize(view);
780 	if (err)
781 		return err;
782 
783 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
784 		return got_error_from_errno("mvwin");
785 
786 	return NULL;
787 }
788 
789 static int
790 view_is_parent_view(struct tog_view *view)
791 {
792 	return view->parent == NULL;
793 }
794 
795 static int
796 view_is_splitscreen(struct tog_view *view)
797 {
798 	return view->begin_x > 0 || view->begin_y > 0;
799 }
800 
801 static int
802 view_is_fullscreen(struct tog_view *view)
803 {
804 	return view->nlines == LINES && view->ncols == COLS;
805 }
806 
807 static int
808 view_is_hsplit_top(struct tog_view *view)
809 {
810 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
811 	    view_is_splitscreen(view->child);
812 }
813 
814 static void
815 view_border(struct tog_view *view)
816 {
817 	PANEL *panel;
818 	const struct tog_view *view_above;
819 
820 	if (view->parent)
821 		return view_border(view->parent);
822 
823 	panel = panel_above(view->panel);
824 	if (panel == NULL)
825 		return;
826 
827 	view_above = panel_userptr(panel);
828 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
829 		mvwhline(view->window, view_above->begin_y - 1,
830 		    view->begin_x, got_locale_is_utf8() ?
831 		    ACS_HLINE : '-', view->ncols);
832 	else
833 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
834 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
835 }
836 
837 static const struct got_error *view_init_hsplit(struct tog_view *, int);
838 static const struct got_error *request_log_commits(struct tog_view *);
839 static const struct got_error *offset_selection_down(struct tog_view *);
840 static void offset_selection_up(struct tog_view *);
841 static void view_get_split(struct tog_view *, int *, int *);
842 
843 static const struct got_error *
844 view_resize(struct tog_view *view)
845 {
846 	const struct got_error	*err = NULL;
847 	int			 dif, nlines, ncols;
848 
849 	dif = LINES - view->lines;  /* line difference */
850 
851 	if (view->lines > LINES)
852 		nlines = view->nlines - (view->lines - LINES);
853 	else
854 		nlines = view->nlines + (LINES - view->lines);
855 	if (view->cols > COLS)
856 		ncols = view->ncols - (view->cols - COLS);
857 	else
858 		ncols = view->ncols + (COLS - view->cols);
859 
860 	if (view->child) {
861 		int hs = view->child->begin_y;
862 
863 		if (!view_is_fullscreen(view))
864 			view->child->begin_x = view_split_begin_x(view->begin_x);
865 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
866 		    view->child->begin_x == 0) {
867 			ncols = COLS;
868 
869 			view_fullscreen(view->child);
870 			if (view->child->focussed)
871 				show_panel(view->child->panel);
872 			else
873 				show_panel(view->panel);
874 		} else {
875 			ncols = view->child->begin_x;
876 
877 			view_splitscreen(view->child);
878 			show_panel(view->child->panel);
879 		}
880 		/*
881 		 * XXX This is ugly and needs to be moved into the above
882 		 * logic but "works" for now and my attempts at moving it
883 		 * break either 'tab' or 'F' key maps in horizontal splits.
884 		 */
885 		if (hs) {
886 			err = view_splitscreen(view->child);
887 			if (err)
888 				return err;
889 			if (dif < 0) { /* top split decreased */
890 				err = offset_selection_down(view);
891 				if (err)
892 					return err;
893 			}
894 			view_border(view);
895 			update_panels();
896 			doupdate();
897 			show_panel(view->child->panel);
898 			nlines = view->nlines;
899 		}
900 	} else if (view->parent == NULL)
901 		ncols = COLS;
902 
903 	if (view->resize && dif > 0) {
904 		err = view->resize(view, dif);
905 		if (err)
906 			return err;
907 	}
908 
909 	if (wresize(view->window, nlines, ncols) == ERR)
910 		return got_error_from_errno("wresize");
911 	if (replace_panel(view->panel, view->window) == ERR)
912 		return got_error_from_errno("replace_panel");
913 	wclear(view->window);
914 
915 	view->nlines = nlines;
916 	view->ncols = ncols;
917 	view->lines = LINES;
918 	view->cols = COLS;
919 
920 	return NULL;
921 }
922 
923 static const struct got_error *
924 resize_log_view(struct tog_view *view, int increase)
925 {
926 	struct tog_log_view_state	*s = &view->state.log;
927 	const struct got_error		*err = NULL;
928 	int				 n = 0;
929 
930 	if (s->selected_entry)
931 		n = s->selected_entry->idx + view->lines - s->selected;
932 
933 	/*
934 	 * Request commits to account for the increased
935 	 * height so we have enough to populate the view.
936 	 */
937 	if (s->commits.ncommits < n) {
938 		view->nscrolled = n - s->commits.ncommits + increase + 1;
939 		err = request_log_commits(view);
940 	}
941 
942 	return err;
943 }
944 
945 static void
946 view_adjust_offset(struct tog_view *view, int n)
947 {
948 	if (n == 0)
949 		return;
950 
951 	if (view->parent && view->parent->offset) {
952 		if (view->parent->offset + n >= 0)
953 			view->parent->offset += n;
954 		else
955 			view->parent->offset = 0;
956 	} else if (view->offset) {
957 		if (view->offset - n >= 0)
958 			view->offset -= n;
959 		else
960 			view->offset = 0;
961 	}
962 }
963 
964 static const struct got_error *
965 view_resize_split(struct tog_view *view, int resize)
966 {
967 	const struct got_error	*err = NULL;
968 	struct tog_view		*v = NULL;
969 
970 	if (view->parent)
971 		v = view->parent;
972 	else
973 		v = view;
974 
975 	if (!v->child || !view_is_splitscreen(v->child))
976 		return NULL;
977 
978 	v->resized = v->child->resized = resize;  /* lock for resize event */
979 
980 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
981 		if (v->child->resized_y)
982 			v->child->begin_y = v->child->resized_y;
983 		if (view->parent)
984 			v->child->begin_y -= resize;
985 		else
986 			v->child->begin_y += resize;
987 		if (v->child->begin_y < 3) {
988 			view->count = 0;
989 			v->child->begin_y = 3;
990 		} else if (v->child->begin_y > LINES - 1) {
991 			view->count = 0;
992 			v->child->begin_y = LINES - 1;
993 		}
994 		v->ncols = COLS;
995 		v->child->ncols = COLS;
996 		view_adjust_offset(view, resize);
997 		err = view_init_hsplit(v, v->child->begin_y);
998 		if (err)
999 			return err;
1000 		v->child->resized_y = v->child->begin_y;
1001 	} else {
1002 		if (v->child->resized_x)
1003 			v->child->begin_x = v->child->resized_x;
1004 		if (view->parent)
1005 			v->child->begin_x -= resize;
1006 		else
1007 			v->child->begin_x += resize;
1008 		if (v->child->begin_x < 11) {
1009 			view->count = 0;
1010 			v->child->begin_x = 11;
1011 		} else if (v->child->begin_x > COLS - 1) {
1012 			view->count = 0;
1013 			v->child->begin_x = COLS - 1;
1014 		}
1015 		v->child->resized_x = v->child->begin_x;
1016 	}
1017 
1018 	v->child->mode = v->mode;
1019 	v->child->nlines = v->lines - v->child->begin_y;
1020 	v->child->ncols = v->cols - v->child->begin_x;
1021 	v->focus_child = 1;
1022 
1023 	err = view_fullscreen(v);
1024 	if (err)
1025 		return err;
1026 	err = view_splitscreen(v->child);
1027 	if (err)
1028 		return err;
1029 
1030 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1031 		err = offset_selection_down(v->child);
1032 		if (err)
1033 			return err;
1034 	}
1035 
1036 	if (v->resize)
1037 		err = v->resize(v, 0);
1038 	else if (v->child->resize)
1039 		err = v->child->resize(v->child, 0);
1040 
1041 	v->resized = v->child->resized = 0;
1042 
1043 	return err;
1044 }
1045 
1046 static void
1047 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1048 {
1049 	struct tog_view *v = src->child ? src->child : src;
1050 
1051 	dst->resized_x = v->resized_x;
1052 	dst->resized_y = v->resized_y;
1053 }
1054 
1055 static const struct got_error *
1056 view_close_child(struct tog_view *view)
1057 {
1058 	const struct got_error *err = NULL;
1059 
1060 	if (view->child == NULL)
1061 		return NULL;
1062 
1063 	err = view_close(view->child);
1064 	view->child = NULL;
1065 	return err;
1066 }
1067 
1068 static const struct got_error *
1069 view_set_child(struct tog_view *view, struct tog_view *child)
1070 {
1071 	const struct got_error *err = NULL;
1072 
1073 	view->child = child;
1074 	child->parent = view;
1075 
1076 	err = view_resize(view);
1077 	if (err)
1078 		return err;
1079 
1080 	if (view->child->resized_x || view->child->resized_y)
1081 		err = view_resize_split(view, 0);
1082 
1083 	return err;
1084 }
1085 
1086 static void
1087 tog_resizeterm(void)
1088 {
1089 	int cols, lines;
1090 	struct winsize size;
1091 
1092 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1093 		cols = 80;     /* Default */
1094 		lines = 24;
1095 	} else {
1096 		cols = size.ws_col;
1097 		lines = size.ws_row;
1098 	}
1099 	resize_term(lines, cols);
1100 }
1101 
1102 static const struct got_error *
1103 view_search_start(struct tog_view *view)
1104 {
1105 	const struct got_error *err = NULL;
1106 	struct tog_view *v = view;
1107 	char pattern[1024];
1108 	int ret;
1109 
1110 	if (view->search_started) {
1111 		regfree(&view->regex);
1112 		view->searching = 0;
1113 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1114 	}
1115 	view->search_started = 0;
1116 
1117 	if (view->nlines < 1)
1118 		return NULL;
1119 
1120 	if (view_is_hsplit_top(view))
1121 		v = view->child;
1122 
1123 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1124 	wclrtoeol(v->window);
1125 
1126 	nodelay(view->window, FALSE);  /* block for search term input */
1127 	nocbreak();
1128 	echo();
1129 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1130 	wrefresh(v->window);
1131 	cbreak();
1132 	noecho();
1133 	nodelay(view->window, TRUE);
1134 	if (ret == ERR)
1135 		return NULL;
1136 
1137 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1138 		err = view->search_start(view);
1139 		if (err) {
1140 			regfree(&view->regex);
1141 			return err;
1142 		}
1143 		view->search_started = 1;
1144 		view->searching = TOG_SEARCH_FORWARD;
1145 		view->search_next_done = 0;
1146 		view->search_next(view);
1147 	}
1148 
1149 	return NULL;
1150 }
1151 
1152 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1153 static const struct got_error *
1154 switch_split(struct tog_view *view)
1155 {
1156 	const struct got_error	*err = NULL;
1157 	struct tog_view		*v = NULL;
1158 
1159 	if (view->parent)
1160 		v = view->parent;
1161 	else
1162 		v = view;
1163 
1164 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1165 		v->mode = TOG_VIEW_SPLIT_VERT;
1166 	else
1167 		v->mode = TOG_VIEW_SPLIT_HRZN;
1168 
1169 	if (!v->child)
1170 		return NULL;
1171 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1172 		v->mode = TOG_VIEW_SPLIT_NONE;
1173 
1174 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1175 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1176 		v->child->begin_y = v->child->resized_y;
1177 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1178 		v->child->begin_x = v->child->resized_x;
1179 
1180 
1181 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1182 		v->ncols = COLS;
1183 		v->child->ncols = COLS;
1184 		v->child->nscrolled = LINES - v->child->nlines;
1185 
1186 		err = view_init_hsplit(v, v->child->begin_y);
1187 		if (err)
1188 			return err;
1189 	}
1190 	v->child->mode = v->mode;
1191 	v->child->nlines = v->lines - v->child->begin_y;
1192 	v->focus_child = 1;
1193 
1194 	err = view_fullscreen(v);
1195 	if (err)
1196 		return err;
1197 	err = view_splitscreen(v->child);
1198 	if (err)
1199 		return err;
1200 
1201 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1202 		v->mode = TOG_VIEW_SPLIT_VERT;
1203 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1204 		err = offset_selection_down(v);
1205 		err = offset_selection_down(v->child);
1206 	} else {
1207 		offset_selection_up(v);
1208 		offset_selection_up(v->child);
1209 	}
1210 	if (v->resize)
1211 		err = v->resize(v, 0);
1212 	else if (v->child->resize)
1213 		err = v->child->resize(v->child, 0);
1214 
1215 	return err;
1216 }
1217 
1218 /*
1219  * Compute view->count from numeric input. Assign total to view->count and
1220  * return first non-numeric key entered.
1221  */
1222 static int
1223 get_compound_key(struct tog_view *view, int c)
1224 {
1225 	struct tog_view	*v = view;
1226 	int		 x, n = 0;
1227 
1228 	if (view_is_hsplit_top(view))
1229 		v = view->child;
1230 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1231 		v = view->parent;
1232 
1233 	view->count = 0;
1234 	cbreak();  /* block for input */
1235 	wmove(v->window, v->nlines - 1, 0);
1236 	wclrtoeol(v->window);
1237 	waddch(v->window, ':');
1238 
1239 	do {
1240 		x = getcurx(v->window);
1241 		if (x != ERR && x < view->ncols) {
1242 			waddch(v->window, c);
1243 			wrefresh(v->window);
1244 		}
1245 
1246 		/*
1247 		 * Don't overflow. Max valid request should be the greatest
1248 		 * between the longest and total lines; cap at 10 million.
1249 		 */
1250 		if (n >= 9999999)
1251 			n = 9999999;
1252 		else
1253 			n = n * 10 + (c - '0');
1254 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1255 
1256 	/* Massage excessive or inapplicable values at the input handler. */
1257 	view->count = n;
1258 
1259 	return c;
1260 }
1261 
1262 static const struct got_error *
1263 view_input(struct tog_view **new, int *done, struct tog_view *view,
1264     struct tog_view_list_head *views)
1265 {
1266 	const struct got_error *err = NULL;
1267 	struct tog_view *v;
1268 	int ch, errcode;
1269 
1270 	*new = NULL;
1271 
1272 	/* Clear "no matches" indicator. */
1273 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1274 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1275 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1276 		view->count = 0;
1277 	}
1278 
1279 	if (view->searching && !view->search_next_done) {
1280 		errcode = pthread_mutex_unlock(&tog_mutex);
1281 		if (errcode)
1282 			return got_error_set_errno(errcode,
1283 			    "pthread_mutex_unlock");
1284 		sched_yield();
1285 		errcode = pthread_mutex_lock(&tog_mutex);
1286 		if (errcode)
1287 			return got_error_set_errno(errcode,
1288 			    "pthread_mutex_lock");
1289 		view->search_next(view);
1290 		return NULL;
1291 	}
1292 
1293 	nodelay(view->window, FALSE);
1294 	/* Allow threads to make progress while we are waiting for input. */
1295 	errcode = pthread_mutex_unlock(&tog_mutex);
1296 	if (errcode)
1297 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1298 	/* If we have an unfinished count, let C-g or backspace abort. */
1299 	if (view->count && --view->count) {
1300 		cbreak();
1301 		nodelay(view->window, TRUE);
1302 		ch = wgetch(view->window);
1303 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1304 			view->count = 0;
1305 		else
1306 			ch = view->ch;
1307 	} else {
1308 		ch = wgetch(view->window);
1309 		if (ch >= '1' && ch  <= '9')
1310 			view->ch = ch = get_compound_key(view, ch);
1311 	}
1312 	errcode = pthread_mutex_lock(&tog_mutex);
1313 	if (errcode)
1314 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1315 	nodelay(view->window, TRUE);
1316 
1317 	if (tog_sigwinch_received || tog_sigcont_received) {
1318 		tog_resizeterm();
1319 		tog_sigwinch_received = 0;
1320 		tog_sigcont_received = 0;
1321 		TAILQ_FOREACH(v, views, entry) {
1322 			err = view_resize(v);
1323 			if (err)
1324 				return err;
1325 			err = v->input(new, v, KEY_RESIZE);
1326 			if (err)
1327 				return err;
1328 			if (v->child) {
1329 				err = view_resize(v->child);
1330 				if (err)
1331 					return err;
1332 				err = v->child->input(new, v->child,
1333 				    KEY_RESIZE);
1334 				if (err)
1335 					return err;
1336 				if (v->child->resized_x || v->child->resized_y) {
1337 					err = view_resize_split(v, 0);
1338 					if (err)
1339 						return err;
1340 				}
1341 			}
1342 		}
1343 	}
1344 
1345 	switch (ch) {
1346 	case '\t':
1347 		view->count = 0;
1348 		if (view->child) {
1349 			view->focussed = 0;
1350 			view->child->focussed = 1;
1351 			view->focus_child = 1;
1352 		} else if (view->parent) {
1353 			view->focussed = 0;
1354 			view->parent->focussed = 1;
1355 			view->parent->focus_child = 0;
1356 			if (!view_is_splitscreen(view)) {
1357 				if (view->parent->resize) {
1358 					err = view->parent->resize(view->parent,
1359 					    0);
1360 					if (err)
1361 						return err;
1362 				}
1363 				offset_selection_up(view->parent);
1364 				err = view_fullscreen(view->parent);
1365 				if (err)
1366 					return err;
1367 			}
1368 		}
1369 		break;
1370 	case 'q':
1371 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1372 			if (view->parent->resize) {
1373 				/* might need more commits to fill fullscreen */
1374 				err = view->parent->resize(view->parent, 0);
1375 				if (err)
1376 					break;
1377 			}
1378 			offset_selection_up(view->parent);
1379 		}
1380 		err = view->input(new, view, ch);
1381 		view->dying = 1;
1382 		break;
1383 	case 'Q':
1384 		*done = 1;
1385 		break;
1386 	case 'F':
1387 		view->count = 0;
1388 		if (view_is_parent_view(view)) {
1389 			if (view->child == NULL)
1390 				break;
1391 			if (view_is_splitscreen(view->child)) {
1392 				view->focussed = 0;
1393 				view->child->focussed = 1;
1394 				err = view_fullscreen(view->child);
1395 			} else {
1396 				err = view_splitscreen(view->child);
1397 				if (!err)
1398 					err = view_resize_split(view, 0);
1399 			}
1400 			if (err)
1401 				break;
1402 			err = view->child->input(new, view->child,
1403 			    KEY_RESIZE);
1404 		} else {
1405 			if (view_is_splitscreen(view)) {
1406 				view->parent->focussed = 0;
1407 				view->focussed = 1;
1408 				err = view_fullscreen(view);
1409 			} else {
1410 				err = view_splitscreen(view);
1411 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1412 					err = view_resize(view->parent);
1413 				if (!err)
1414 					err = view_resize_split(view, 0);
1415 			}
1416 			if (err)
1417 				break;
1418 			err = view->input(new, view, KEY_RESIZE);
1419 		}
1420 		if (err)
1421 			break;
1422 		if (view->resize) {
1423 			err = view->resize(view, 0);
1424 			if (err)
1425 				break;
1426 		}
1427 		if (view->parent)
1428 			err = offset_selection_down(view->parent);
1429 		if (!err)
1430 			err = offset_selection_down(view);
1431 		break;
1432 	case 'S':
1433 		view->count = 0;
1434 		err = switch_split(view);
1435 		break;
1436 	case '-':
1437 		err = view_resize_split(view, -1);
1438 		break;
1439 	case '+':
1440 		err = view_resize_split(view, 1);
1441 		break;
1442 	case KEY_RESIZE:
1443 		break;
1444 	case '/':
1445 		view->count = 0;
1446 		if (view->search_start)
1447 			view_search_start(view);
1448 		else
1449 			err = view->input(new, view, ch);
1450 		break;
1451 	case 'N':
1452 	case 'n':
1453 		if (view->search_started && view->search_next) {
1454 			view->searching = (ch == 'n' ?
1455 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1456 			view->search_next_done = 0;
1457 			view->search_next(view);
1458 		} else
1459 			err = view->input(new, view, ch);
1460 		break;
1461 	case 'A':
1462 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1463 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1464 		else
1465 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1466 		TAILQ_FOREACH(v, views, entry) {
1467 			if (v->reset) {
1468 				err = v->reset(v);
1469 				if (err)
1470 					return err;
1471 			}
1472 			if (v->child && v->child->reset) {
1473 				err = v->child->reset(v->child);
1474 				if (err)
1475 					return err;
1476 			}
1477 		}
1478 		break;
1479 	default:
1480 		err = view->input(new, view, ch);
1481 		break;
1482 	}
1483 
1484 	return err;
1485 }
1486 
1487 static int
1488 view_needs_focus_indication(struct tog_view *view)
1489 {
1490 	if (view_is_parent_view(view)) {
1491 		if (view->child == NULL || view->child->focussed)
1492 			return 0;
1493 		if (!view_is_splitscreen(view->child))
1494 			return 0;
1495 	} else if (!view_is_splitscreen(view))
1496 		return 0;
1497 
1498 	return view->focussed;
1499 }
1500 
1501 static const struct got_error *
1502 view_loop(struct tog_view *view)
1503 {
1504 	const struct got_error *err = NULL;
1505 	struct tog_view_list_head views;
1506 	struct tog_view *new_view;
1507 	char *mode;
1508 	int fast_refresh = 10;
1509 	int done = 0, errcode;
1510 
1511 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1512 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1513 		view->mode = TOG_VIEW_SPLIT_VERT;
1514 	else
1515 		view->mode = TOG_VIEW_SPLIT_HRZN;
1516 
1517 	errcode = pthread_mutex_lock(&tog_mutex);
1518 	if (errcode)
1519 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1520 
1521 	TAILQ_INIT(&views);
1522 	TAILQ_INSERT_HEAD(&views, view, entry);
1523 
1524 	view->focussed = 1;
1525 	err = view->show(view);
1526 	if (err)
1527 		return err;
1528 	update_panels();
1529 	doupdate();
1530 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1531 	    !tog_fatal_signal_received()) {
1532 		/* Refresh fast during initialization, then become slower. */
1533 		if (fast_refresh && fast_refresh-- == 0)
1534 			halfdelay(10); /* switch to once per second */
1535 
1536 		err = view_input(&new_view, &done, view, &views);
1537 		if (err)
1538 			break;
1539 		if (view->dying) {
1540 			struct tog_view *v, *prev = NULL;
1541 
1542 			if (view_is_parent_view(view))
1543 				prev = TAILQ_PREV(view, tog_view_list_head,
1544 				    entry);
1545 			else if (view->parent)
1546 				prev = view->parent;
1547 
1548 			if (view->parent) {
1549 				view->parent->child = NULL;
1550 				view->parent->focus_child = 0;
1551 				/* Restore fullscreen line height. */
1552 				view->parent->nlines = view->parent->lines;
1553 				err = view_resize(view->parent);
1554 				if (err)
1555 					break;
1556 				/* Make resized splits persist. */
1557 				view_transfer_size(view->parent, view);
1558 			} else
1559 				TAILQ_REMOVE(&views, view, entry);
1560 
1561 			err = view_close(view);
1562 			if (err)
1563 				goto done;
1564 
1565 			view = NULL;
1566 			TAILQ_FOREACH(v, &views, entry) {
1567 				if (v->focussed)
1568 					break;
1569 			}
1570 			if (view == NULL && new_view == NULL) {
1571 				/* No view has focus. Try to pick one. */
1572 				if (prev)
1573 					view = prev;
1574 				else if (!TAILQ_EMPTY(&views)) {
1575 					view = TAILQ_LAST(&views,
1576 					    tog_view_list_head);
1577 				}
1578 				if (view) {
1579 					if (view->focus_child) {
1580 						view->child->focussed = 1;
1581 						view = view->child;
1582 					} else
1583 						view->focussed = 1;
1584 				}
1585 			}
1586 		}
1587 		if (new_view) {
1588 			struct tog_view *v, *t;
1589 			/* Only allow one parent view per type. */
1590 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1591 				if (v->type != new_view->type)
1592 					continue;
1593 				TAILQ_REMOVE(&views, v, entry);
1594 				err = view_close(v);
1595 				if (err)
1596 					goto done;
1597 				break;
1598 			}
1599 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1600 			view = new_view;
1601 		}
1602 		if (view) {
1603 			if (view_is_parent_view(view)) {
1604 				if (view->child && view->child->focussed)
1605 					view = view->child;
1606 			} else {
1607 				if (view->parent && view->parent->focussed)
1608 					view = view->parent;
1609 			}
1610 			show_panel(view->panel);
1611 			if (view->child && view_is_splitscreen(view->child))
1612 				show_panel(view->child->panel);
1613 			if (view->parent && view_is_splitscreen(view)) {
1614 				err = view->parent->show(view->parent);
1615 				if (err)
1616 					goto done;
1617 			}
1618 			err = view->show(view);
1619 			if (err)
1620 				goto done;
1621 			if (view->child) {
1622 				err = view->child->show(view->child);
1623 				if (err)
1624 					goto done;
1625 			}
1626 			update_panels();
1627 			doupdate();
1628 		}
1629 	}
1630 done:
1631 	while (!TAILQ_EMPTY(&views)) {
1632 		const struct got_error *close_err;
1633 		view = TAILQ_FIRST(&views);
1634 		TAILQ_REMOVE(&views, view, entry);
1635 		close_err = view_close(view);
1636 		if (close_err && err == NULL)
1637 			err = close_err;
1638 	}
1639 
1640 	errcode = pthread_mutex_unlock(&tog_mutex);
1641 	if (errcode && err == NULL)
1642 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1643 
1644 	return err;
1645 }
1646 
1647 __dead static void
1648 usage_log(void)
1649 {
1650 	endwin();
1651 	fprintf(stderr,
1652 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1653 	    getprogname());
1654 	exit(1);
1655 }
1656 
1657 /* Create newly allocated wide-character string equivalent to a byte string. */
1658 static const struct got_error *
1659 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1660 {
1661 	char *vis = NULL;
1662 	const struct got_error *err = NULL;
1663 
1664 	*ws = NULL;
1665 	*wlen = mbstowcs(NULL, s, 0);
1666 	if (*wlen == (size_t)-1) {
1667 		int vislen;
1668 		if (errno != EILSEQ)
1669 			return got_error_from_errno("mbstowcs");
1670 
1671 		/* byte string invalid in current encoding; try to "fix" it */
1672 		err = got_mbsavis(&vis, &vislen, s);
1673 		if (err)
1674 			return err;
1675 		*wlen = mbstowcs(NULL, vis, 0);
1676 		if (*wlen == (size_t)-1) {
1677 			err = got_error_from_errno("mbstowcs"); /* give up */
1678 			goto done;
1679 		}
1680 	}
1681 
1682 	*ws = calloc(*wlen + 1, sizeof(**ws));
1683 	if (*ws == NULL) {
1684 		err = got_error_from_errno("calloc");
1685 		goto done;
1686 	}
1687 
1688 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1689 		err = got_error_from_errno("mbstowcs");
1690 done:
1691 	free(vis);
1692 	if (err) {
1693 		free(*ws);
1694 		*ws = NULL;
1695 		*wlen = 0;
1696 	}
1697 	return err;
1698 }
1699 
1700 static const struct got_error *
1701 expand_tab(char **ptr, const char *src)
1702 {
1703 	char	*dst;
1704 	size_t	 len, n, idx = 0, sz = 0;
1705 
1706 	*ptr = NULL;
1707 	n = len = strlen(src);
1708 	dst = malloc(n + 1);
1709 	if (dst == NULL)
1710 		return got_error_from_errno("malloc");
1711 
1712 	while (idx < len && src[idx]) {
1713 		const char c = src[idx];
1714 
1715 		if (c == '\t') {
1716 			size_t nb = TABSIZE - sz % TABSIZE;
1717 			char *p;
1718 
1719 			p = realloc(dst, n + nb);
1720 			if (p == NULL) {
1721 				free(dst);
1722 				return got_error_from_errno("realloc");
1723 
1724 			}
1725 			dst = p;
1726 			n += nb;
1727 			memset(dst + sz, ' ', nb);
1728 			sz += nb;
1729 		} else
1730 			dst[sz++] = src[idx];
1731 		++idx;
1732 	}
1733 
1734 	dst[sz] = '\0';
1735 	*ptr = dst;
1736 	return NULL;
1737 }
1738 
1739 /*
1740  * Advance at most n columns from wline starting at offset off.
1741  * Return the index to the first character after the span operation.
1742  * Return the combined column width of all spanned wide character in
1743  * *rcol.
1744  */
1745 static int
1746 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1747 {
1748 	int width, i, cols = 0;
1749 
1750 	if (n == 0) {
1751 		*rcol = cols;
1752 		return off;
1753 	}
1754 
1755 	for (i = off; wline[i] != L'\0'; ++i) {
1756 		if (wline[i] == L'\t')
1757 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1758 		else
1759 			width = wcwidth(wline[i]);
1760 
1761 		if (width == -1) {
1762 			width = 1;
1763 			wline[i] = L'.';
1764 		}
1765 
1766 		if (cols + width > n)
1767 			break;
1768 		cols += width;
1769 	}
1770 
1771 	*rcol = cols;
1772 	return i;
1773 }
1774 
1775 /*
1776  * Format a line for display, ensuring that it won't overflow a width limit.
1777  * With scrolling, the width returned refers to the scrolled version of the
1778  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1779  */
1780 static const struct got_error *
1781 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1782     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1783 {
1784 	const struct got_error *err = NULL;
1785 	int cols;
1786 	wchar_t *wline = NULL;
1787 	char *exstr = NULL;
1788 	size_t wlen;
1789 	int i, scrollx;
1790 
1791 	*wlinep = NULL;
1792 	*widthp = 0;
1793 
1794 	if (expand) {
1795 		err = expand_tab(&exstr, line);
1796 		if (err)
1797 			return err;
1798 	}
1799 
1800 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1801 	free(exstr);
1802 	if (err)
1803 		return err;
1804 
1805 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1806 
1807 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1808 		wline[wlen - 1] = L'\0';
1809 		wlen--;
1810 	}
1811 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1812 		wline[wlen - 1] = L'\0';
1813 		wlen--;
1814 	}
1815 
1816 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1817 	wline[i] = L'\0';
1818 
1819 	if (widthp)
1820 		*widthp = cols;
1821 	if (scrollxp)
1822 		*scrollxp = scrollx;
1823 	if (err)
1824 		free(wline);
1825 	else
1826 		*wlinep = wline;
1827 	return err;
1828 }
1829 
1830 static const struct got_error*
1831 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1832     struct got_object_id *id, struct got_repository *repo)
1833 {
1834 	static const struct got_error *err = NULL;
1835 	struct got_reflist_entry *re;
1836 	char *s;
1837 	const char *name;
1838 
1839 	*refs_str = NULL;
1840 
1841 	TAILQ_FOREACH(re, refs, entry) {
1842 		struct got_tag_object *tag = NULL;
1843 		struct got_object_id *ref_id;
1844 		int cmp;
1845 
1846 		name = got_ref_get_name(re->ref);
1847 		if (strcmp(name, GOT_REF_HEAD) == 0)
1848 			continue;
1849 		if (strncmp(name, "refs/", 5) == 0)
1850 			name += 5;
1851 		if (strncmp(name, "got/", 4) == 0 &&
1852 		    strncmp(name, "got/backup/", 11) != 0)
1853 			continue;
1854 		if (strncmp(name, "heads/", 6) == 0)
1855 			name += 6;
1856 		if (strncmp(name, "remotes/", 8) == 0) {
1857 			name += 8;
1858 			s = strstr(name, "/" GOT_REF_HEAD);
1859 			if (s != NULL && s[strlen(s)] == '\0')
1860 				continue;
1861 		}
1862 		err = got_ref_resolve(&ref_id, repo, re->ref);
1863 		if (err)
1864 			break;
1865 		if (strncmp(name, "tags/", 5) == 0) {
1866 			err = got_object_open_as_tag(&tag, repo, ref_id);
1867 			if (err) {
1868 				if (err->code != GOT_ERR_OBJ_TYPE) {
1869 					free(ref_id);
1870 					break;
1871 				}
1872 				/* Ref points at something other than a tag. */
1873 				err = NULL;
1874 				tag = NULL;
1875 			}
1876 		}
1877 		cmp = got_object_id_cmp(tag ?
1878 		    got_object_tag_get_object_id(tag) : ref_id, id);
1879 		free(ref_id);
1880 		if (tag)
1881 			got_object_tag_close(tag);
1882 		if (cmp != 0)
1883 			continue;
1884 		s = *refs_str;
1885 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1886 		    s ? ", " : "", name) == -1) {
1887 			err = got_error_from_errno("asprintf");
1888 			free(s);
1889 			*refs_str = NULL;
1890 			break;
1891 		}
1892 		free(s);
1893 	}
1894 
1895 	return err;
1896 }
1897 
1898 static const struct got_error *
1899 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1900     int col_tab_align)
1901 {
1902 	char *smallerthan;
1903 
1904 	smallerthan = strchr(author, '<');
1905 	if (smallerthan && smallerthan[1] != '\0')
1906 		author = smallerthan + 1;
1907 	author[strcspn(author, "@>")] = '\0';
1908 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1909 	    col_tab_align, 0);
1910 }
1911 
1912 static const struct got_error *
1913 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1914     struct got_object_id *id, const size_t date_display_cols,
1915     int author_display_cols)
1916 {
1917 	struct tog_log_view_state *s = &view->state.log;
1918 	const struct got_error *err = NULL;
1919 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1920 	char *logmsg0 = NULL, *logmsg = NULL;
1921 	char *author = NULL;
1922 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1923 	int author_width, logmsg_width;
1924 	char *newline, *line = NULL;
1925 	int col, limit, scrollx;
1926 	const int avail = view->ncols;
1927 	struct tm tm;
1928 	time_t committer_time;
1929 	struct tog_color *tc;
1930 
1931 	committer_time = got_object_commit_get_committer_time(commit);
1932 	if (gmtime_r(&committer_time, &tm) == NULL)
1933 		return got_error_from_errno("gmtime_r");
1934 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1935 		return got_error(GOT_ERR_NO_SPACE);
1936 
1937 	if (avail <= date_display_cols)
1938 		limit = MIN(sizeof(datebuf) - 1, avail);
1939 	else
1940 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
1941 	tc = get_color(&s->colors, TOG_COLOR_DATE);
1942 	if (tc)
1943 		wattr_on(view->window,
1944 		    COLOR_PAIR(tc->colorpair), NULL);
1945 	waddnstr(view->window, datebuf, limit);
1946 	if (tc)
1947 		wattr_off(view->window,
1948 		    COLOR_PAIR(tc->colorpair), NULL);
1949 	col = limit;
1950 	if (col > avail)
1951 		goto done;
1952 
1953 	if (avail >= 120) {
1954 		char *id_str;
1955 		err = got_object_id_str(&id_str, id);
1956 		if (err)
1957 			goto done;
1958 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
1959 		if (tc)
1960 			wattr_on(view->window,
1961 			    COLOR_PAIR(tc->colorpair), NULL);
1962 		wprintw(view->window, "%.8s ", id_str);
1963 		if (tc)
1964 			wattr_off(view->window,
1965 			    COLOR_PAIR(tc->colorpair), NULL);
1966 		free(id_str);
1967 		col += 9;
1968 		if (col > avail)
1969 			goto done;
1970 	}
1971 
1972 	if (s->use_committer)
1973 		author = strdup(got_object_commit_get_committer(commit));
1974 	else
1975 		author = strdup(got_object_commit_get_author(commit));
1976 	if (author == NULL) {
1977 		err = got_error_from_errno("strdup");
1978 		goto done;
1979 	}
1980 	err = format_author(&wauthor, &author_width, author, avail - col, col);
1981 	if (err)
1982 		goto done;
1983 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
1984 	if (tc)
1985 		wattr_on(view->window,
1986 		    COLOR_PAIR(tc->colorpair), NULL);
1987 	waddwstr(view->window, wauthor);
1988 	if (tc)
1989 		wattr_off(view->window,
1990 		    COLOR_PAIR(tc->colorpair), NULL);
1991 	col += author_width;
1992 	while (col < avail && author_width < author_display_cols + 2) {
1993 		waddch(view->window, ' ');
1994 		col++;
1995 		author_width++;
1996 	}
1997 	if (col > avail)
1998 		goto done;
1999 
2000 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2001 	if (err)
2002 		goto done;
2003 	logmsg = logmsg0;
2004 	while (*logmsg == '\n')
2005 		logmsg++;
2006 	newline = strchr(logmsg, '\n');
2007 	if (newline)
2008 		*newline = '\0';
2009 	limit = avail - col;
2010 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2011 		limit--;	/* for the border */
2012 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2013 	    limit, col, 1);
2014 	if (err)
2015 		goto done;
2016 	waddwstr(view->window, &wlogmsg[scrollx]);
2017 	col += MAX(logmsg_width, 0);
2018 	while (col < avail) {
2019 		waddch(view->window, ' ');
2020 		col++;
2021 	}
2022 done:
2023 	free(logmsg0);
2024 	free(wlogmsg);
2025 	free(author);
2026 	free(wauthor);
2027 	free(line);
2028 	return err;
2029 }
2030 
2031 static struct commit_queue_entry *
2032 alloc_commit_queue_entry(struct got_commit_object *commit,
2033     struct got_object_id *id)
2034 {
2035 	struct commit_queue_entry *entry;
2036 
2037 	entry = calloc(1, sizeof(*entry));
2038 	if (entry == NULL)
2039 		return NULL;
2040 
2041 	entry->id = id;
2042 	entry->commit = commit;
2043 	return entry;
2044 }
2045 
2046 static void
2047 pop_commit(struct commit_queue *commits)
2048 {
2049 	struct commit_queue_entry *entry;
2050 
2051 	entry = TAILQ_FIRST(&commits->head);
2052 	TAILQ_REMOVE(&commits->head, entry, entry);
2053 	got_object_commit_close(entry->commit);
2054 	commits->ncommits--;
2055 	/* Don't free entry->id! It is owned by the commit graph. */
2056 	free(entry);
2057 }
2058 
2059 static void
2060 free_commits(struct commit_queue *commits)
2061 {
2062 	while (!TAILQ_EMPTY(&commits->head))
2063 		pop_commit(commits);
2064 }
2065 
2066 static const struct got_error *
2067 match_commit(int *have_match, struct got_object_id *id,
2068     struct got_commit_object *commit, regex_t *regex)
2069 {
2070 	const struct got_error *err = NULL;
2071 	regmatch_t regmatch;
2072 	char *id_str = NULL, *logmsg = NULL;
2073 
2074 	*have_match = 0;
2075 
2076 	err = got_object_id_str(&id_str, id);
2077 	if (err)
2078 		return err;
2079 
2080 	err = got_object_commit_get_logmsg(&logmsg, commit);
2081 	if (err)
2082 		goto done;
2083 
2084 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2085 	    &regmatch, 0) == 0 ||
2086 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2087 	    &regmatch, 0) == 0 ||
2088 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2089 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2090 		*have_match = 1;
2091 done:
2092 	free(id_str);
2093 	free(logmsg);
2094 	return err;
2095 }
2096 
2097 static const struct got_error *
2098 queue_commits(struct tog_log_thread_args *a)
2099 {
2100 	const struct got_error *err = NULL;
2101 
2102 	/*
2103 	 * We keep all commits open throughout the lifetime of the log
2104 	 * view in order to avoid having to re-fetch commits from disk
2105 	 * while updating the display.
2106 	 */
2107 	do {
2108 		struct got_object_id *id;
2109 		struct got_commit_object *commit;
2110 		struct commit_queue_entry *entry;
2111 		int errcode;
2112 
2113 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2114 		    NULL, NULL);
2115 		if (err || id == NULL)
2116 			break;
2117 
2118 		err = got_object_open_as_commit(&commit, a->repo, id);
2119 		if (err)
2120 			break;
2121 		entry = alloc_commit_queue_entry(commit, id);
2122 		if (entry == NULL) {
2123 			err = got_error_from_errno("alloc_commit_queue_entry");
2124 			break;
2125 		}
2126 
2127 		errcode = pthread_mutex_lock(&tog_mutex);
2128 		if (errcode) {
2129 			err = got_error_set_errno(errcode,
2130 			    "pthread_mutex_lock");
2131 			break;
2132 		}
2133 
2134 		entry->idx = a->commits->ncommits;
2135 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2136 		a->commits->ncommits++;
2137 
2138 		if (*a->searching == TOG_SEARCH_FORWARD &&
2139 		    !*a->search_next_done) {
2140 			int have_match;
2141 			err = match_commit(&have_match, id, commit, a->regex);
2142 			if (err)
2143 				break;
2144 			if (have_match)
2145 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2146 		}
2147 
2148 		errcode = pthread_mutex_unlock(&tog_mutex);
2149 		if (errcode && err == NULL)
2150 			err = got_error_set_errno(errcode,
2151 			    "pthread_mutex_unlock");
2152 		if (err)
2153 			break;
2154 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2155 
2156 	return err;
2157 }
2158 
2159 static void
2160 select_commit(struct tog_log_view_state *s)
2161 {
2162 	struct commit_queue_entry *entry;
2163 	int ncommits = 0;
2164 
2165 	entry = s->first_displayed_entry;
2166 	while (entry) {
2167 		if (ncommits == s->selected) {
2168 			s->selected_entry = entry;
2169 			break;
2170 		}
2171 		entry = TAILQ_NEXT(entry, entry);
2172 		ncommits++;
2173 	}
2174 }
2175 
2176 static const struct got_error *
2177 draw_commits(struct tog_view *view)
2178 {
2179 	const struct got_error *err = NULL;
2180 	struct tog_log_view_state *s = &view->state.log;
2181 	struct commit_queue_entry *entry = s->selected_entry;
2182 	const int limit = view->nlines;
2183 	int width;
2184 	int ncommits, author_cols = 4;
2185 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2186 	char *refs_str = NULL;
2187 	wchar_t *wline;
2188 	struct tog_color *tc;
2189 	static const size_t date_display_cols = 12;
2190 
2191 	if (s->selected_entry &&
2192 	    !(view->searching && view->search_next_done == 0)) {
2193 		struct got_reflist_head *refs;
2194 		err = got_object_id_str(&id_str, s->selected_entry->id);
2195 		if (err)
2196 			return err;
2197 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2198 		    s->selected_entry->id);
2199 		if (refs) {
2200 			err = build_refs_str(&refs_str, refs,
2201 			    s->selected_entry->id, s->repo);
2202 			if (err)
2203 				goto done;
2204 		}
2205 	}
2206 
2207 	if (s->thread_args.commits_needed == 0)
2208 		halfdelay(10); /* disable fast refresh */
2209 
2210 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2211 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2212 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2213 		    (view->searching && !view->search_next_done) ?
2214 		    "searching..." : "loading...") == -1) {
2215 			err = got_error_from_errno("asprintf");
2216 			goto done;
2217 		}
2218 	} else {
2219 		const char *search_str = NULL;
2220 
2221 		if (view->searching) {
2222 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2223 				search_str = "no more matches";
2224 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2225 				search_str = "no matches found";
2226 			else if (!view->search_next_done)
2227 				search_str = "searching...";
2228 		}
2229 
2230 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2231 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2232 		    search_str ? search_str :
2233 		    (refs_str ? refs_str : "")) == -1) {
2234 			err = got_error_from_errno("asprintf");
2235 			goto done;
2236 		}
2237 	}
2238 
2239 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2240 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2241 		    "........................................",
2242 		    s->in_repo_path, ncommits_str) == -1) {
2243 			err = got_error_from_errno("asprintf");
2244 			header = NULL;
2245 			goto done;
2246 		}
2247 	} else if (asprintf(&header, "commit %s%s",
2248 	    id_str ? id_str : "........................................",
2249 	    ncommits_str) == -1) {
2250 		err = got_error_from_errno("asprintf");
2251 		header = NULL;
2252 		goto done;
2253 	}
2254 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2255 	if (err)
2256 		goto done;
2257 
2258 	werase(view->window);
2259 
2260 	if (view_needs_focus_indication(view))
2261 		wstandout(view->window);
2262 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2263 	if (tc)
2264 		wattr_on(view->window,
2265 		    COLOR_PAIR(tc->colorpair), NULL);
2266 	waddwstr(view->window, wline);
2267 	if (tc)
2268 		wattr_off(view->window,
2269 		    COLOR_PAIR(tc->colorpair), NULL);
2270 	while (width < view->ncols) {
2271 		waddch(view->window, ' ');
2272 		width++;
2273 	}
2274 	if (view_needs_focus_indication(view))
2275 		wstandend(view->window);
2276 	free(wline);
2277 	if (limit <= 1)
2278 		goto done;
2279 
2280 	/* Grow author column size if necessary, and set view->maxx. */
2281 	entry = s->first_displayed_entry;
2282 	ncommits = 0;
2283 	view->maxx = 0;
2284 	while (entry) {
2285 		struct got_commit_object *c = entry->commit;
2286 		char *author, *eol, *msg, *msg0;
2287 		wchar_t *wauthor, *wmsg;
2288 		int width;
2289 		if (ncommits >= limit - 1)
2290 			break;
2291 		if (s->use_committer)
2292 			author = strdup(got_object_commit_get_committer(c));
2293 		else
2294 			author = strdup(got_object_commit_get_author(c));
2295 		if (author == NULL) {
2296 			err = got_error_from_errno("strdup");
2297 			goto done;
2298 		}
2299 		err = format_author(&wauthor, &width, author, COLS,
2300 		    date_display_cols);
2301 		if (author_cols < width)
2302 			author_cols = width;
2303 		free(wauthor);
2304 		free(author);
2305 		if (err)
2306 			goto done;
2307 		err = got_object_commit_get_logmsg(&msg0, c);
2308 		if (err)
2309 			goto done;
2310 		msg = msg0;
2311 		while (*msg == '\n')
2312 			++msg;
2313 		if ((eol = strchr(msg, '\n')))
2314 			*eol = '\0';
2315 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2316 		    date_display_cols + author_cols, 0);
2317 		if (err)
2318 			goto done;
2319 		view->maxx = MAX(view->maxx, width);
2320 		free(msg0);
2321 		free(wmsg);
2322 		ncommits++;
2323 		entry = TAILQ_NEXT(entry, entry);
2324 	}
2325 
2326 	entry = s->first_displayed_entry;
2327 	s->last_displayed_entry = s->first_displayed_entry;
2328 	ncommits = 0;
2329 	while (entry) {
2330 		if (ncommits >= limit - 1)
2331 			break;
2332 		if (ncommits == s->selected)
2333 			wstandout(view->window);
2334 		err = draw_commit(view, entry->commit, entry->id,
2335 		    date_display_cols, author_cols);
2336 		if (ncommits == s->selected)
2337 			wstandend(view->window);
2338 		if (err)
2339 			goto done;
2340 		ncommits++;
2341 		s->last_displayed_entry = entry;
2342 		entry = TAILQ_NEXT(entry, entry);
2343 	}
2344 
2345 	view_border(view);
2346 done:
2347 	free(id_str);
2348 	free(refs_str);
2349 	free(ncommits_str);
2350 	free(header);
2351 	return err;
2352 }
2353 
2354 static void
2355 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2356 {
2357 	struct commit_queue_entry *entry;
2358 	int nscrolled = 0;
2359 
2360 	entry = TAILQ_FIRST(&s->commits.head);
2361 	if (s->first_displayed_entry == entry)
2362 		return;
2363 
2364 	entry = s->first_displayed_entry;
2365 	while (entry && nscrolled < maxscroll) {
2366 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2367 		if (entry) {
2368 			s->first_displayed_entry = entry;
2369 			nscrolled++;
2370 		}
2371 	}
2372 }
2373 
2374 static const struct got_error *
2375 trigger_log_thread(struct tog_view *view, int wait)
2376 {
2377 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2378 	int errcode;
2379 
2380 	halfdelay(1); /* fast refresh while loading commits */
2381 
2382 	while (!ta->log_complete && !tog_thread_error &&
2383 	    (ta->commits_needed > 0 || ta->load_all)) {
2384 		/* Wake the log thread. */
2385 		errcode = pthread_cond_signal(&ta->need_commits);
2386 		if (errcode)
2387 			return got_error_set_errno(errcode,
2388 			    "pthread_cond_signal");
2389 
2390 		/*
2391 		 * The mutex will be released while the view loop waits
2392 		 * in wgetch(), at which time the log thread will run.
2393 		 */
2394 		if (!wait)
2395 			break;
2396 
2397 		/* Display progress update in log view. */
2398 		show_log_view(view);
2399 		update_panels();
2400 		doupdate();
2401 
2402 		/* Wait right here while next commit is being loaded. */
2403 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2404 		if (errcode)
2405 			return got_error_set_errno(errcode,
2406 			    "pthread_cond_wait");
2407 
2408 		/* Display progress update in log view. */
2409 		show_log_view(view);
2410 		update_panels();
2411 		doupdate();
2412 	}
2413 
2414 	return NULL;
2415 }
2416 
2417 static const struct got_error *
2418 request_log_commits(struct tog_view *view)
2419 {
2420 	struct tog_log_view_state	*state = &view->state.log;
2421 	const struct got_error		*err = NULL;
2422 
2423 	if (state->thread_args.log_complete)
2424 		return NULL;
2425 
2426 	state->thread_args.commits_needed += view->nscrolled;
2427 	err = trigger_log_thread(view, 1);
2428 	view->nscrolled = 0;
2429 
2430 	return err;
2431 }
2432 
2433 static const struct got_error *
2434 log_scroll_down(struct tog_view *view, int maxscroll)
2435 {
2436 	struct tog_log_view_state *s = &view->state.log;
2437 	const struct got_error *err = NULL;
2438 	struct commit_queue_entry *pentry;
2439 	int nscrolled = 0, ncommits_needed;
2440 
2441 	if (s->last_displayed_entry == NULL)
2442 		return NULL;
2443 
2444 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2445 	if (s->commits.ncommits < ncommits_needed &&
2446 	    !s->thread_args.log_complete) {
2447 		/*
2448 		 * Ask the log thread for required amount of commits.
2449 		 */
2450 		s->thread_args.commits_needed += maxscroll;
2451 		err = trigger_log_thread(view, 1);
2452 		if (err)
2453 			return err;
2454 	}
2455 
2456 	do {
2457 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2458 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2459 			break;
2460 
2461 		s->last_displayed_entry = pentry ?
2462 		    pentry : s->last_displayed_entry;;
2463 
2464 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2465 		if (pentry == NULL)
2466 			break;
2467 		s->first_displayed_entry = pentry;
2468 	} while (++nscrolled < maxscroll);
2469 
2470 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2471 		view->nscrolled += nscrolled;
2472 	else
2473 		view->nscrolled = 0;
2474 
2475 	return err;
2476 }
2477 
2478 static const struct got_error *
2479 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2480     struct got_commit_object *commit, struct got_object_id *commit_id,
2481     struct tog_view *log_view, struct got_repository *repo)
2482 {
2483 	const struct got_error *err;
2484 	struct got_object_qid *parent_id;
2485 	struct tog_view *diff_view;
2486 
2487 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2488 	if (diff_view == NULL)
2489 		return got_error_from_errno("view_open");
2490 
2491 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2492 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2493 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2494 	if (err == NULL)
2495 		*new_view = diff_view;
2496 	return err;
2497 }
2498 
2499 static const struct got_error *
2500 tree_view_visit_subtree(struct tog_tree_view_state *s,
2501     struct got_tree_object *subtree)
2502 {
2503 	struct tog_parent_tree *parent;
2504 
2505 	parent = calloc(1, sizeof(*parent));
2506 	if (parent == NULL)
2507 		return got_error_from_errno("calloc");
2508 
2509 	parent->tree = s->tree;
2510 	parent->first_displayed_entry = s->first_displayed_entry;
2511 	parent->selected_entry = s->selected_entry;
2512 	parent->selected = s->selected;
2513 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2514 	s->tree = subtree;
2515 	s->selected = 0;
2516 	s->first_displayed_entry = NULL;
2517 	return NULL;
2518 }
2519 
2520 static const struct got_error *
2521 tree_view_walk_path(struct tog_tree_view_state *s,
2522     struct got_commit_object *commit, const char *path)
2523 {
2524 	const struct got_error *err = NULL;
2525 	struct got_tree_object *tree = NULL;
2526 	const char *p;
2527 	char *slash, *subpath = NULL;
2528 
2529 	/* Walk the path and open corresponding tree objects. */
2530 	p = path;
2531 	while (*p) {
2532 		struct got_tree_entry *te;
2533 		struct got_object_id *tree_id;
2534 		char *te_name;
2535 
2536 		while (p[0] == '/')
2537 			p++;
2538 
2539 		/* Ensure the correct subtree entry is selected. */
2540 		slash = strchr(p, '/');
2541 		if (slash == NULL)
2542 			te_name = strdup(p);
2543 		else
2544 			te_name = strndup(p, slash - p);
2545 		if (te_name == NULL) {
2546 			err = got_error_from_errno("strndup");
2547 			break;
2548 		}
2549 		te = got_object_tree_find_entry(s->tree, te_name);
2550 		if (te == NULL) {
2551 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2552 			free(te_name);
2553 			break;
2554 		}
2555 		free(te_name);
2556 		s->first_displayed_entry = s->selected_entry = te;
2557 
2558 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2559 			break; /* jump to this file's entry */
2560 
2561 		slash = strchr(p, '/');
2562 		if (slash)
2563 			subpath = strndup(path, slash - path);
2564 		else
2565 			subpath = strdup(path);
2566 		if (subpath == NULL) {
2567 			err = got_error_from_errno("strdup");
2568 			break;
2569 		}
2570 
2571 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2572 		    subpath);
2573 		if (err)
2574 			break;
2575 
2576 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2577 		free(tree_id);
2578 		if (err)
2579 			break;
2580 
2581 		err = tree_view_visit_subtree(s, tree);
2582 		if (err) {
2583 			got_object_tree_close(tree);
2584 			break;
2585 		}
2586 		if (slash == NULL)
2587 			break;
2588 		free(subpath);
2589 		subpath = NULL;
2590 		p = slash;
2591 	}
2592 
2593 	free(subpath);
2594 	return err;
2595 }
2596 
2597 static const struct got_error *
2598 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2599     struct commit_queue_entry *entry, const char *path,
2600     const char *head_ref_name, struct got_repository *repo)
2601 {
2602 	const struct got_error *err = NULL;
2603 	struct tog_tree_view_state *s;
2604 	struct tog_view *tree_view;
2605 
2606 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2607 	if (tree_view == NULL)
2608 		return got_error_from_errno("view_open");
2609 
2610 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2611 	if (err)
2612 		return err;
2613 	s = &tree_view->state.tree;
2614 
2615 	*new_view = tree_view;
2616 
2617 	if (got_path_is_root_dir(path))
2618 		return NULL;
2619 
2620 	return tree_view_walk_path(s, entry->commit, path);
2621 }
2622 
2623 static const struct got_error *
2624 block_signals_used_by_main_thread(void)
2625 {
2626 	sigset_t sigset;
2627 	int errcode;
2628 
2629 	if (sigemptyset(&sigset) == -1)
2630 		return got_error_from_errno("sigemptyset");
2631 
2632 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2633 	if (sigaddset(&sigset, SIGWINCH) == -1)
2634 		return got_error_from_errno("sigaddset");
2635 	if (sigaddset(&sigset, SIGCONT) == -1)
2636 		return got_error_from_errno("sigaddset");
2637 	if (sigaddset(&sigset, SIGINT) == -1)
2638 		return got_error_from_errno("sigaddset");
2639 	if (sigaddset(&sigset, SIGTERM) == -1)
2640 		return got_error_from_errno("sigaddset");
2641 
2642 	/* ncurses handles SIGTSTP */
2643 	if (sigaddset(&sigset, SIGTSTP) == -1)
2644 		return got_error_from_errno("sigaddset");
2645 
2646 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2647 	if (errcode)
2648 		return got_error_set_errno(errcode, "pthread_sigmask");
2649 
2650 	return NULL;
2651 }
2652 
2653 static void *
2654 log_thread(void *arg)
2655 {
2656 	const struct got_error *err = NULL;
2657 	int errcode = 0;
2658 	struct tog_log_thread_args *a = arg;
2659 	int done = 0;
2660 
2661 	/*
2662 	 * Sync startup with main thread such that we begin our
2663 	 * work once view_input() has released the mutex.
2664 	 */
2665 	errcode = pthread_mutex_lock(&tog_mutex);
2666 	if (errcode) {
2667 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2668 		return (void *)err;
2669 	}
2670 
2671 	err = block_signals_used_by_main_thread();
2672 	if (err) {
2673 		pthread_mutex_unlock(&tog_mutex);
2674 		goto done;
2675 	}
2676 
2677 	while (!done && !err && !tog_fatal_signal_received()) {
2678 		errcode = pthread_mutex_unlock(&tog_mutex);
2679 		if (errcode) {
2680 			err = got_error_set_errno(errcode,
2681 			    "pthread_mutex_unlock");
2682 			goto done;
2683 		}
2684 		err = queue_commits(a);
2685 		if (err) {
2686 			if (err->code != GOT_ERR_ITER_COMPLETED)
2687 				goto done;
2688 			err = NULL;
2689 			done = 1;
2690 		} else if (a->commits_needed > 0 && !a->load_all)
2691 			a->commits_needed--;
2692 
2693 		errcode = pthread_mutex_lock(&tog_mutex);
2694 		if (errcode) {
2695 			err = got_error_set_errno(errcode,
2696 			    "pthread_mutex_lock");
2697 			goto done;
2698 		} else if (*a->quit)
2699 			done = 1;
2700 		else if (*a->first_displayed_entry == NULL) {
2701 			*a->first_displayed_entry =
2702 			    TAILQ_FIRST(&a->commits->head);
2703 			*a->selected_entry = *a->first_displayed_entry;
2704 		}
2705 
2706 		errcode = pthread_cond_signal(&a->commit_loaded);
2707 		if (errcode) {
2708 			err = got_error_set_errno(errcode,
2709 			    "pthread_cond_signal");
2710 			pthread_mutex_unlock(&tog_mutex);
2711 			goto done;
2712 		}
2713 
2714 		if (done)
2715 			a->commits_needed = 0;
2716 		else {
2717 			if (a->commits_needed == 0 && !a->load_all) {
2718 				errcode = pthread_cond_wait(&a->need_commits,
2719 				    &tog_mutex);
2720 				if (errcode) {
2721 					err = got_error_set_errno(errcode,
2722 					    "pthread_cond_wait");
2723 					pthread_mutex_unlock(&tog_mutex);
2724 					goto done;
2725 				}
2726 				if (*a->quit)
2727 					done = 1;
2728 			}
2729 		}
2730 	}
2731 	a->log_complete = 1;
2732 	errcode = pthread_mutex_unlock(&tog_mutex);
2733 	if (errcode)
2734 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2735 done:
2736 	if (err) {
2737 		tog_thread_error = 1;
2738 		pthread_cond_signal(&a->commit_loaded);
2739 	}
2740 	return (void *)err;
2741 }
2742 
2743 static const struct got_error *
2744 stop_log_thread(struct tog_log_view_state *s)
2745 {
2746 	const struct got_error *err = NULL, *thread_err = NULL;
2747 	int errcode;
2748 
2749 	if (s->thread) {
2750 		s->quit = 1;
2751 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2752 		if (errcode)
2753 			return got_error_set_errno(errcode,
2754 			    "pthread_cond_signal");
2755 		errcode = pthread_mutex_unlock(&tog_mutex);
2756 		if (errcode)
2757 			return got_error_set_errno(errcode,
2758 			    "pthread_mutex_unlock");
2759 		errcode = pthread_join(s->thread, (void **)&thread_err);
2760 		if (errcode)
2761 			return got_error_set_errno(errcode, "pthread_join");
2762 		errcode = pthread_mutex_lock(&tog_mutex);
2763 		if (errcode)
2764 			return got_error_set_errno(errcode,
2765 			    "pthread_mutex_lock");
2766 		s->thread = NULL;
2767 	}
2768 
2769 	if (s->thread_args.repo) {
2770 		err = got_repo_close(s->thread_args.repo);
2771 		s->thread_args.repo = NULL;
2772 	}
2773 
2774 	if (s->thread_args.pack_fds) {
2775 		const struct got_error *pack_err =
2776 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2777 		if (err == NULL)
2778 			err = pack_err;
2779 		s->thread_args.pack_fds = NULL;
2780 	}
2781 
2782 	if (s->thread_args.graph) {
2783 		got_commit_graph_close(s->thread_args.graph);
2784 		s->thread_args.graph = NULL;
2785 	}
2786 
2787 	return err ? err : thread_err;
2788 }
2789 
2790 static const struct got_error *
2791 close_log_view(struct tog_view *view)
2792 {
2793 	const struct got_error *err = NULL;
2794 	struct tog_log_view_state *s = &view->state.log;
2795 	int errcode;
2796 
2797 	err = stop_log_thread(s);
2798 
2799 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2800 	if (errcode && err == NULL)
2801 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2802 
2803 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2804 	if (errcode && err == NULL)
2805 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2806 
2807 	free_commits(&s->commits);
2808 	free(s->in_repo_path);
2809 	s->in_repo_path = NULL;
2810 	free(s->start_id);
2811 	s->start_id = NULL;
2812 	free(s->head_ref_name);
2813 	s->head_ref_name = NULL;
2814 	return err;
2815 }
2816 
2817 static const struct got_error *
2818 search_start_log_view(struct tog_view *view)
2819 {
2820 	struct tog_log_view_state *s = &view->state.log;
2821 
2822 	s->matched_entry = NULL;
2823 	s->search_entry = NULL;
2824 	return NULL;
2825 }
2826 
2827 static const struct got_error *
2828 search_next_log_view(struct tog_view *view)
2829 {
2830 	const struct got_error *err = NULL;
2831 	struct tog_log_view_state *s = &view->state.log;
2832 	struct commit_queue_entry *entry;
2833 
2834 	/* Display progress update in log view. */
2835 	show_log_view(view);
2836 	update_panels();
2837 	doupdate();
2838 
2839 	if (s->search_entry) {
2840 		int errcode, ch;
2841 		errcode = pthread_mutex_unlock(&tog_mutex);
2842 		if (errcode)
2843 			return got_error_set_errno(errcode,
2844 			    "pthread_mutex_unlock");
2845 		ch = wgetch(view->window);
2846 		errcode = pthread_mutex_lock(&tog_mutex);
2847 		if (errcode)
2848 			return got_error_set_errno(errcode,
2849 			    "pthread_mutex_lock");
2850 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2851 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2852 			return NULL;
2853 		}
2854 		if (view->searching == TOG_SEARCH_FORWARD)
2855 			entry = TAILQ_NEXT(s->search_entry, entry);
2856 		else
2857 			entry = TAILQ_PREV(s->search_entry,
2858 			    commit_queue_head, entry);
2859 	} else if (s->matched_entry) {
2860 		int matched_idx = s->matched_entry->idx;
2861 		int selected_idx = s->selected_entry->idx;
2862 
2863 		/*
2864 		 * If the user has moved the cursor after we hit a match,
2865 		 * the position from where we should continue searching
2866 		 * might have changed.
2867 		 */
2868 		if (view->searching == TOG_SEARCH_FORWARD) {
2869 			if (matched_idx > selected_idx)
2870 				entry = TAILQ_NEXT(s->selected_entry, entry);
2871 			else
2872 				entry = TAILQ_NEXT(s->matched_entry, entry);
2873 		} else {
2874 			if (matched_idx < selected_idx)
2875 				entry = TAILQ_PREV(s->selected_entry,
2876 						commit_queue_head, entry);
2877 			else
2878 				entry = TAILQ_PREV(s->matched_entry,
2879 						commit_queue_head, entry);
2880 		}
2881 	} else {
2882 		entry = s->selected_entry;
2883 	}
2884 
2885 	while (1) {
2886 		int have_match = 0;
2887 
2888 		if (entry == NULL) {
2889 			if (s->thread_args.log_complete ||
2890 			    view->searching == TOG_SEARCH_BACKWARD) {
2891 				view->search_next_done =
2892 				    (s->matched_entry == NULL ?
2893 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2894 				s->search_entry = NULL;
2895 				return NULL;
2896 			}
2897 			/*
2898 			 * Poke the log thread for more commits and return,
2899 			 * allowing the main loop to make progress. Search
2900 			 * will resume at s->search_entry once we come back.
2901 			 */
2902 			s->thread_args.commits_needed++;
2903 			return trigger_log_thread(view, 0);
2904 		}
2905 
2906 		err = match_commit(&have_match, entry->id, entry->commit,
2907 		    &view->regex);
2908 		if (err)
2909 			break;
2910 		if (have_match) {
2911 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2912 			s->matched_entry = entry;
2913 			break;
2914 		}
2915 
2916 		s->search_entry = entry;
2917 		if (view->searching == TOG_SEARCH_FORWARD)
2918 			entry = TAILQ_NEXT(entry, entry);
2919 		else
2920 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2921 	}
2922 
2923 	if (s->matched_entry) {
2924 		int cur = s->selected_entry->idx;
2925 		while (cur < s->matched_entry->idx) {
2926 			err = input_log_view(NULL, view, KEY_DOWN);
2927 			if (err)
2928 				return err;
2929 			cur++;
2930 		}
2931 		while (cur > s->matched_entry->idx) {
2932 			err = input_log_view(NULL, view, KEY_UP);
2933 			if (err)
2934 				return err;
2935 			cur--;
2936 		}
2937 	}
2938 
2939 	s->search_entry = NULL;
2940 
2941 	return NULL;
2942 }
2943 
2944 static const struct got_error *
2945 open_log_view(struct tog_view *view, struct got_object_id *start_id,
2946     struct got_repository *repo, const char *head_ref_name,
2947     const char *in_repo_path, int log_branches)
2948 {
2949 	const struct got_error *err = NULL;
2950 	struct tog_log_view_state *s = &view->state.log;
2951 	struct got_repository *thread_repo = NULL;
2952 	struct got_commit_graph *thread_graph = NULL;
2953 	int errcode;
2954 
2955 	if (in_repo_path != s->in_repo_path) {
2956 		free(s->in_repo_path);
2957 		s->in_repo_path = strdup(in_repo_path);
2958 		if (s->in_repo_path == NULL)
2959 			return got_error_from_errno("strdup");
2960 	}
2961 
2962 	/* The commit queue only contains commits being displayed. */
2963 	TAILQ_INIT(&s->commits.head);
2964 	s->commits.ncommits = 0;
2965 
2966 	s->repo = repo;
2967 	if (head_ref_name) {
2968 		s->head_ref_name = strdup(head_ref_name);
2969 		if (s->head_ref_name == NULL) {
2970 			err = got_error_from_errno("strdup");
2971 			goto done;
2972 		}
2973 	}
2974 	s->start_id = got_object_id_dup(start_id);
2975 	if (s->start_id == NULL) {
2976 		err = got_error_from_errno("got_object_id_dup");
2977 		goto done;
2978 	}
2979 	s->log_branches = log_branches;
2980 
2981 	STAILQ_INIT(&s->colors);
2982 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
2983 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
2984 		    get_color_value("TOG_COLOR_COMMIT"));
2985 		if (err)
2986 			goto done;
2987 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
2988 		    get_color_value("TOG_COLOR_AUTHOR"));
2989 		if (err) {
2990 			free_colors(&s->colors);
2991 			goto done;
2992 		}
2993 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
2994 		    get_color_value("TOG_COLOR_DATE"));
2995 		if (err) {
2996 			free_colors(&s->colors);
2997 			goto done;
2998 		}
2999 	}
3000 
3001 	view->show = show_log_view;
3002 	view->input = input_log_view;
3003 	view->resize = resize_log_view;
3004 	view->close = close_log_view;
3005 	view->search_start = search_start_log_view;
3006 	view->search_next = search_next_log_view;
3007 
3008 	if (s->thread_args.pack_fds == NULL) {
3009 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3010 		if (err)
3011 			goto done;
3012 	}
3013 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3014 	    s->thread_args.pack_fds);
3015 	if (err)
3016 		goto done;
3017 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3018 	    !s->log_branches);
3019 	if (err)
3020 		goto done;
3021 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3022 	    s->repo, NULL, NULL);
3023 	if (err)
3024 		goto done;
3025 
3026 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3027 	if (errcode) {
3028 		err = got_error_set_errno(errcode, "pthread_cond_init");
3029 		goto done;
3030 	}
3031 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3032 	if (errcode) {
3033 		err = got_error_set_errno(errcode, "pthread_cond_init");
3034 		goto done;
3035 	}
3036 
3037 	s->thread_args.commits_needed = view->nlines;
3038 	s->thread_args.graph = thread_graph;
3039 	s->thread_args.commits = &s->commits;
3040 	s->thread_args.in_repo_path = s->in_repo_path;
3041 	s->thread_args.start_id = s->start_id;
3042 	s->thread_args.repo = thread_repo;
3043 	s->thread_args.log_complete = 0;
3044 	s->thread_args.quit = &s->quit;
3045 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3046 	s->thread_args.selected_entry = &s->selected_entry;
3047 	s->thread_args.searching = &view->searching;
3048 	s->thread_args.search_next_done = &view->search_next_done;
3049 	s->thread_args.regex = &view->regex;
3050 done:
3051 	if (err)
3052 		close_log_view(view);
3053 	return err;
3054 }
3055 
3056 static const struct got_error *
3057 show_log_view(struct tog_view *view)
3058 {
3059 	const struct got_error *err;
3060 	struct tog_log_view_state *s = &view->state.log;
3061 
3062 	if (s->thread == NULL) {
3063 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3064 		    &s->thread_args);
3065 		if (errcode)
3066 			return got_error_set_errno(errcode, "pthread_create");
3067 		if (s->thread_args.commits_needed > 0) {
3068 			err = trigger_log_thread(view, 1);
3069 			if (err)
3070 				return err;
3071 		}
3072 	}
3073 
3074 	return draw_commits(view);
3075 }
3076 
3077 static void
3078 log_move_cursor_up(struct tog_view *view, int page, int home)
3079 {
3080 	struct tog_log_view_state *s = &view->state.log;
3081 
3082 	if (s->selected_entry->idx == 0)
3083 		view->count = 0;
3084 	if (s->first_displayed_entry == NULL)
3085 		return;
3086 
3087 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3088 	    || home)
3089 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3090 
3091 	if (!page && !home && s->selected > 0)
3092 		--s->selected;
3093 	else
3094 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3095 
3096 	select_commit(s);
3097 	return;
3098 }
3099 
3100 static const struct got_error *
3101 log_move_cursor_down(struct tog_view *view, int page)
3102 {
3103 	struct tog_log_view_state	*s = &view->state.log;
3104 	struct commit_queue_entry	*first;
3105 	const struct got_error		*err = NULL;
3106 
3107 	first = s->first_displayed_entry;
3108 	if (first == NULL) {
3109 		view->count = 0;
3110 		return NULL;
3111 	}
3112 
3113 	if (s->thread_args.log_complete &&
3114 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3115 		return NULL;
3116 
3117 	if (!page) {
3118 		int eos = view->nlines - 2;
3119 
3120 		if (view_is_hsplit_top(view))
3121 			--eos;  /* border consumes the last line */
3122 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3123 			++s->selected;
3124 		else
3125 			err = log_scroll_down(view, 1);
3126 	} else if (s->thread_args.load_all) {
3127 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1)
3128 			s->selected += MIN(s->last_displayed_entry->idx -
3129 			    s->selected_entry->idx, page + 1);
3130 		else
3131 			err = log_scroll_down(view, MIN(page,
3132 			    s->commits.ncommits - s->selected_entry->idx - 1));
3133 		s->selected = MIN(view->nlines - 2, s->commits.ncommits - 1);
3134 	} else {
3135 		err = log_scroll_down(view, page);
3136 		if (err)
3137 			return err;
3138 		if (first == s->first_displayed_entry && s->selected <
3139 		    MIN(view->nlines - 2, s->commits.ncommits - 1)) {
3140 			s->selected = MIN(s->commits.ncommits - 1, page);
3141 		}
3142 	}
3143 	if (err)
3144 		return err;
3145 
3146 	/*
3147 	 * We might necessarily overshoot in horizontal
3148 	 * splits; if so, select the last displayed commit.
3149 	 */
3150 	s->selected = MIN(s->selected,
3151 	    s->last_displayed_entry->idx - s->first_displayed_entry->idx);
3152 
3153 	select_commit(s);
3154 
3155 	if (s->thread_args.log_complete &&
3156 	    s->selected_entry->idx == s->commits.ncommits - 1)
3157 		view->count = 0;
3158 
3159 	return NULL;
3160 }
3161 
3162 static void
3163 view_get_split(struct tog_view *view, int *y, int *x)
3164 {
3165 	*x = 0;
3166 	*y = 0;
3167 
3168 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3169 		if (view->child && view->child->resized_y)
3170 			*y = view->child->resized_y;
3171 		else if (view->resized_y)
3172 			*y = view->resized_y;
3173 		else
3174 			*y = view_split_begin_y(view->lines);
3175 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3176 		if (view->child && view->child->resized_x)
3177 			*x = view->child->resized_x;
3178 		else if (view->resized_x)
3179 			*x = view->resized_x;
3180 		else
3181 			*x = view_split_begin_x(view->begin_x);
3182 	}
3183 }
3184 
3185 /* Split view horizontally at y and offset view->state->selected line. */
3186 static const struct got_error *
3187 view_init_hsplit(struct tog_view *view, int y)
3188 {
3189 	const struct got_error *err = NULL;
3190 
3191 	view->nlines = y;
3192 	view->ncols = COLS;
3193 	err = view_resize(view);
3194 	if (err)
3195 		return err;
3196 
3197 	err = offset_selection_down(view);
3198 
3199 	return err;
3200 }
3201 
3202 static const struct got_error *
3203 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3204 {
3205 	const struct got_error *err = NULL;
3206 	struct tog_log_view_state *s = &view->state.log;
3207 	struct tog_view *diff_view = NULL, *tree_view = NULL;
3208 	struct tog_view *ref_view = NULL;
3209 	struct commit_queue_entry *entry;
3210 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
3211 
3212 	if (s->thread_args.load_all) {
3213 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3214 			s->thread_args.load_all = 0;
3215 		else if (s->thread_args.log_complete) {
3216 			err = log_move_cursor_down(view, s->commits.ncommits);
3217 			s->thread_args.load_all = 0;
3218 		}
3219 		return err;
3220 	}
3221 
3222 	eos = nscroll = view->nlines - 1;
3223 	if (view_is_hsplit_top(view))
3224 		--eos;  /* border */
3225 
3226 	switch (ch) {
3227 	case 'q':
3228 		s->quit = 1;
3229 		break;
3230 	case '0':
3231 		view->x = 0;
3232 		break;
3233 	case '$':
3234 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3235 		view->count = 0;
3236 		break;
3237 	case KEY_RIGHT:
3238 	case 'l':
3239 		if (view->x + view->ncols / 2 < view->maxx)
3240 			view->x += 2;  /* move two columns right */
3241 		else
3242 			view->count = 0;
3243 		break;
3244 	case KEY_LEFT:
3245 	case 'h':
3246 		view->x -= MIN(view->x, 2);  /* move two columns back */
3247 		if (view->x <= 0)
3248 			view->count = 0;
3249 		break;
3250 	case 'k':
3251 	case KEY_UP:
3252 	case '<':
3253 	case ',':
3254 	case CTRL('p'):
3255 		log_move_cursor_up(view, 0, 0);
3256 		break;
3257 	case 'g':
3258 	case KEY_HOME:
3259 		log_move_cursor_up(view, 0, 1);
3260 		view->count = 0;
3261 		break;
3262 	case CTRL('u'):
3263 	case 'u':
3264 		nscroll /= 2;
3265 		/* FALL THROUGH */
3266 	case KEY_PPAGE:
3267 	case CTRL('b'):
3268 	case 'b':
3269 		log_move_cursor_up(view, nscroll, 0);
3270 		break;
3271 	case 'j':
3272 	case KEY_DOWN:
3273 	case '>':
3274 	case '.':
3275 	case CTRL('n'):
3276 		err = log_move_cursor_down(view, 0);
3277 		break;
3278 	case '@':
3279 		s->use_committer = !s->use_committer;
3280 		break;
3281 	case 'G':
3282 	case KEY_END: {
3283 		/* We don't know yet how many commits, so we're forced to
3284 		 * traverse them all. */
3285 		view->count = 0;
3286 		if (!s->thread_args.log_complete) {
3287 			s->thread_args.load_all = 1;
3288 			return trigger_log_thread(view, 0);
3289 		}
3290 
3291 		s->selected = 0;
3292 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3293 		for (n = 0; n < eos; n++) {
3294 			if (entry == NULL)
3295 				break;
3296 			s->first_displayed_entry = entry;
3297 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3298 		}
3299 		if (n > 0)
3300 			s->selected = n - 1;
3301 		select_commit(s);
3302 		break;
3303 	}
3304 	case CTRL('d'):
3305 	case 'd':
3306 		nscroll /= 2;
3307 		/* FALL THROUGH */
3308 	case KEY_NPAGE:
3309 	case CTRL('f'):
3310 	case 'f':
3311 	case ' ':
3312 		err = log_move_cursor_down(view, nscroll);
3313 		break;
3314 	case KEY_RESIZE:
3315 		if (s->selected > view->nlines - 2)
3316 			s->selected = view->nlines - 2;
3317 		if (s->selected > s->commits.ncommits - 1)
3318 			s->selected = s->commits.ncommits - 1;
3319 		select_commit(s);
3320 		if (s->commits.ncommits < view->nlines - 1 &&
3321 		    !s->thread_args.log_complete) {
3322 			s->thread_args.commits_needed += (view->nlines - 1) -
3323 			    s->commits.ncommits;
3324 			err = trigger_log_thread(view, 1);
3325 		}
3326 		break;
3327 	case KEY_ENTER:
3328 	case '\r':
3329 		view->count = 0;
3330 		if (s->selected_entry == NULL)
3331 			break;
3332 
3333 		/* get dimensions--don't split till initialisation succeeds */
3334 		if (view_is_parent_view(view))
3335 			view_get_split(view, &begin_y, &begin_x);
3336 
3337 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3338 		    s->selected_entry->commit, s->selected_entry->id,
3339 		    view, s->repo);
3340 		if (err)
3341 			break;
3342 
3343 		if (view_is_parent_view(view) &&
3344 		    view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3345 			err = view_init_hsplit(view, begin_y);
3346 			if (err)
3347 				break;
3348 		}
3349 
3350 		view->focussed = 0;
3351 		diff_view->focussed = 1;
3352 		diff_view->mode = view->mode;
3353 		diff_view->nlines = view->lines - begin_y;
3354 
3355 		if (view_is_parent_view(view)) {
3356 			view_transfer_size(diff_view, view);
3357 			err = view_close_child(view);
3358 			if (err)
3359 				return err;
3360 			err = view_set_child(view, diff_view);
3361 			if (err)
3362 				return err;
3363 			view->focus_child = 1;
3364 		} else
3365 			*new_view = diff_view;
3366 		break;
3367 	case 't':
3368 		view->count = 0;
3369 		if (s->selected_entry == NULL)
3370 			break;
3371 		if (view_is_parent_view(view))
3372 			view_get_split(view, &begin_y, &begin_x);
3373 		err = browse_commit_tree(&tree_view, begin_y, begin_x,
3374 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3375 		    s->repo);
3376 		if (err)
3377 			break;
3378 		if (view_is_parent_view(view) &&
3379 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3380 			err = view_init_hsplit(view, begin_y);
3381 			if (err)
3382 				break;
3383 		}
3384 		view->focussed = 0;
3385 		tree_view->focussed = 1;
3386 		tree_view->mode = view->mode;
3387 		tree_view->nlines = view->lines - begin_y;
3388 		if (view_is_parent_view(view)) {
3389 			view_transfer_size(tree_view, view);
3390 			err = view_close_child(view);
3391 			if (err)
3392 				return err;
3393 			err = view_set_child(view, tree_view);
3394 			if (err)
3395 				return err;
3396 			view->focus_child = 1;
3397 		} else
3398 			*new_view = tree_view;
3399 		break;
3400 	case KEY_BACKSPACE:
3401 	case CTRL('l'):
3402 	case 'B':
3403 		view->count = 0;
3404 		if (ch == KEY_BACKSPACE &&
3405 		    got_path_is_root_dir(s->in_repo_path))
3406 			break;
3407 		err = stop_log_thread(s);
3408 		if (err)
3409 			return err;
3410 		if (ch == KEY_BACKSPACE) {
3411 			char *parent_path;
3412 			err = got_path_dirname(&parent_path, s->in_repo_path);
3413 			if (err)
3414 				return err;
3415 			free(s->in_repo_path);
3416 			s->in_repo_path = parent_path;
3417 			s->thread_args.in_repo_path = s->in_repo_path;
3418 		} else if (ch == CTRL('l')) {
3419 			struct got_object_id *start_id;
3420 			err = got_repo_match_object_id(&start_id, NULL,
3421 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3422 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3423 			if (err)
3424 				return err;
3425 			free(s->start_id);
3426 			s->start_id = start_id;
3427 			s->thread_args.start_id = s->start_id;
3428 		} else /* 'B' */
3429 			s->log_branches = !s->log_branches;
3430 
3431 		if (s->thread_args.pack_fds == NULL) {
3432 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3433 			if (err)
3434 				return err;
3435 		}
3436 		err = got_repo_open(&s->thread_args.repo,
3437 		    got_repo_get_path(s->repo), NULL,
3438 		    s->thread_args.pack_fds);
3439 		if (err)
3440 			return err;
3441 		tog_free_refs();
3442 		err = tog_load_refs(s->repo, 0);
3443 		if (err)
3444 			return err;
3445 		err = got_commit_graph_open(&s->thread_args.graph,
3446 		    s->in_repo_path, !s->log_branches);
3447 		if (err)
3448 			return err;
3449 		err = got_commit_graph_iter_start(s->thread_args.graph,
3450 		    s->start_id, s->repo, NULL, NULL);
3451 		if (err)
3452 			return err;
3453 		free_commits(&s->commits);
3454 		s->first_displayed_entry = NULL;
3455 		s->last_displayed_entry = NULL;
3456 		s->selected_entry = NULL;
3457 		s->selected = 0;
3458 		s->thread_args.log_complete = 0;
3459 		s->quit = 0;
3460 		s->thread_args.commits_needed = view->lines;
3461 		s->matched_entry = NULL;
3462 		s->search_entry = NULL;
3463 		view->offset = 0;
3464 		break;
3465 	case 'r':
3466 		view->count = 0;
3467 		if (view_is_parent_view(view))
3468 			view_get_split(view, &begin_y, &begin_x);
3469 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
3470 		if (ref_view == NULL)
3471 			return got_error_from_errno("view_open");
3472 		err = open_ref_view(ref_view, s->repo);
3473 		if (err) {
3474 			view_close(ref_view);
3475 			return err;
3476 		}
3477 		if (view_is_parent_view(view) &&
3478 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
3479 			err = view_init_hsplit(view, begin_y);
3480 			if (err)
3481 				break;
3482 		}
3483 		view->focussed = 0;
3484 		ref_view->focussed = 1;
3485 		ref_view->mode = view->mode;
3486 		ref_view->nlines = view->lines - begin_y;
3487 		if (view_is_parent_view(view)) {
3488 			view_transfer_size(ref_view, view);
3489 			err = view_close_child(view);
3490 			if (err)
3491 				return err;
3492 			err = view_set_child(view, ref_view);
3493 			if (err)
3494 				return err;
3495 			view->focus_child = 1;
3496 		} else
3497 			*new_view = ref_view;
3498 		break;
3499 	default:
3500 		view->count = 0;
3501 		break;
3502 	}
3503 
3504 	return err;
3505 }
3506 
3507 static const struct got_error *
3508 apply_unveil(const char *repo_path, const char *worktree_path)
3509 {
3510 	const struct got_error *error;
3511 
3512 #ifdef PROFILE
3513 	if (unveil("gmon.out", "rwc") != 0)
3514 		return got_error_from_errno2("unveil", "gmon.out");
3515 #endif
3516 	if (repo_path && unveil(repo_path, "r") != 0)
3517 		return got_error_from_errno2("unveil", repo_path);
3518 
3519 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3520 		return got_error_from_errno2("unveil", worktree_path);
3521 
3522 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3523 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3524 
3525 	error = got_privsep_unveil_exec_helpers();
3526 	if (error != NULL)
3527 		return error;
3528 
3529 	if (unveil(NULL, NULL) != 0)
3530 		return got_error_from_errno("unveil");
3531 
3532 	return NULL;
3533 }
3534 
3535 static void
3536 init_curses(void)
3537 {
3538 	/*
3539 	 * Override default signal handlers before starting ncurses.
3540 	 * This should prevent ncurses from installing its own
3541 	 * broken cleanup() signal handler.
3542 	 */
3543 	signal(SIGWINCH, tog_sigwinch);
3544 	signal(SIGPIPE, tog_sigpipe);
3545 	signal(SIGCONT, tog_sigcont);
3546 	signal(SIGINT, tog_sigint);
3547 	signal(SIGTERM, tog_sigterm);
3548 
3549 	initscr();
3550 	cbreak();
3551 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3552 	noecho();
3553 	nonl();
3554 	intrflush(stdscr, FALSE);
3555 	keypad(stdscr, TRUE);
3556 	curs_set(0);
3557 	if (getenv("TOG_COLORS") != NULL) {
3558 		start_color();
3559 		use_default_colors();
3560 	}
3561 }
3562 
3563 static const struct got_error *
3564 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3565     struct got_repository *repo, struct got_worktree *worktree)
3566 {
3567 	const struct got_error *err = NULL;
3568 
3569 	if (argc == 0) {
3570 		*in_repo_path = strdup("/");
3571 		if (*in_repo_path == NULL)
3572 			return got_error_from_errno("strdup");
3573 		return NULL;
3574 	}
3575 
3576 	if (worktree) {
3577 		const char *prefix = got_worktree_get_path_prefix(worktree);
3578 		char *p;
3579 
3580 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3581 		if (err)
3582 			return err;
3583 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3584 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3585 		    p) == -1) {
3586 			err = got_error_from_errno("asprintf");
3587 			*in_repo_path = NULL;
3588 		}
3589 		free(p);
3590 	} else
3591 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3592 
3593 	return err;
3594 }
3595 
3596 static const struct got_error *
3597 cmd_log(int argc, char *argv[])
3598 {
3599 	const struct got_error *error;
3600 	struct got_repository *repo = NULL;
3601 	struct got_worktree *worktree = NULL;
3602 	struct got_object_id *start_id = NULL;
3603 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3604 	char *start_commit = NULL, *label = NULL;
3605 	struct got_reference *ref = NULL;
3606 	const char *head_ref_name = NULL;
3607 	int ch, log_branches = 0;
3608 	struct tog_view *view;
3609 	int *pack_fds = NULL;
3610 
3611 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3612 		switch (ch) {
3613 		case 'b':
3614 			log_branches = 1;
3615 			break;
3616 		case 'c':
3617 			start_commit = optarg;
3618 			break;
3619 		case 'r':
3620 			repo_path = realpath(optarg, NULL);
3621 			if (repo_path == NULL)
3622 				return got_error_from_errno2("realpath",
3623 				    optarg);
3624 			break;
3625 		default:
3626 			usage_log();
3627 			/* NOTREACHED */
3628 		}
3629 	}
3630 
3631 	argc -= optind;
3632 	argv += optind;
3633 
3634 	if (argc > 1)
3635 		usage_log();
3636 
3637 	error = got_repo_pack_fds_open(&pack_fds);
3638 	if (error != NULL)
3639 		goto done;
3640 
3641 	if (repo_path == NULL) {
3642 		cwd = getcwd(NULL, 0);
3643 		if (cwd == NULL)
3644 			return got_error_from_errno("getcwd");
3645 		error = got_worktree_open(&worktree, cwd);
3646 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3647 			goto done;
3648 		if (worktree)
3649 			repo_path =
3650 			    strdup(got_worktree_get_repo_path(worktree));
3651 		else
3652 			repo_path = strdup(cwd);
3653 		if (repo_path == NULL) {
3654 			error = got_error_from_errno("strdup");
3655 			goto done;
3656 		}
3657 	}
3658 
3659 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3660 	if (error != NULL)
3661 		goto done;
3662 
3663 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3664 	    repo, worktree);
3665 	if (error)
3666 		goto done;
3667 
3668 	init_curses();
3669 
3670 	error = apply_unveil(got_repo_get_path(repo),
3671 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3672 	if (error)
3673 		goto done;
3674 
3675 	/* already loaded by tog_log_with_path()? */
3676 	if (TAILQ_EMPTY(&tog_refs)) {
3677 		error = tog_load_refs(repo, 0);
3678 		if (error)
3679 			goto done;
3680 	}
3681 
3682 	if (start_commit == NULL) {
3683 		error = got_repo_match_object_id(&start_id, &label,
3684 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3685 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3686 		if (error)
3687 			goto done;
3688 		head_ref_name = label;
3689 	} else {
3690 		error = got_ref_open(&ref, repo, start_commit, 0);
3691 		if (error == NULL)
3692 			head_ref_name = got_ref_get_name(ref);
3693 		else if (error->code != GOT_ERR_NOT_REF)
3694 			goto done;
3695 		error = got_repo_match_object_id(&start_id, NULL,
3696 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3697 		if (error)
3698 			goto done;
3699 	}
3700 
3701 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3702 	if (view == NULL) {
3703 		error = got_error_from_errno("view_open");
3704 		goto done;
3705 	}
3706 	error = open_log_view(view, start_id, repo, head_ref_name,
3707 	    in_repo_path, log_branches);
3708 	if (error)
3709 		goto done;
3710 	if (worktree) {
3711 		/* Release work tree lock. */
3712 		got_worktree_close(worktree);
3713 		worktree = NULL;
3714 	}
3715 	error = view_loop(view);
3716 done:
3717 	free(in_repo_path);
3718 	free(repo_path);
3719 	free(cwd);
3720 	free(start_id);
3721 	free(label);
3722 	if (ref)
3723 		got_ref_close(ref);
3724 	if (repo) {
3725 		const struct got_error *close_err = got_repo_close(repo);
3726 		if (error == NULL)
3727 			error = close_err;
3728 	}
3729 	if (worktree)
3730 		got_worktree_close(worktree);
3731 	if (pack_fds) {
3732 		const struct got_error *pack_err =
3733 		    got_repo_pack_fds_close(pack_fds);
3734 		if (error == NULL)
3735 			error = pack_err;
3736 	}
3737 	tog_free_refs();
3738 	return error;
3739 }
3740 
3741 __dead static void
3742 usage_diff(void)
3743 {
3744 	endwin();
3745 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3746 	    "[-w] object1 object2\n", getprogname());
3747 	exit(1);
3748 }
3749 
3750 static int
3751 match_line(const char *line, regex_t *regex, size_t nmatch,
3752     regmatch_t *regmatch)
3753 {
3754 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3755 }
3756 
3757 static struct tog_color *
3758 match_color(struct tog_colors *colors, const char *line)
3759 {
3760 	struct tog_color *tc = NULL;
3761 
3762 	STAILQ_FOREACH(tc, colors, entry) {
3763 		if (match_line(line, &tc->regex, 0, NULL))
3764 			return tc;
3765 	}
3766 
3767 	return NULL;
3768 }
3769 
3770 static const struct got_error *
3771 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3772     WINDOW *window, int skipcol, regmatch_t *regmatch)
3773 {
3774 	const struct got_error *err = NULL;
3775 	char *exstr = NULL;
3776 	wchar_t *wline = NULL;
3777 	int rme, rms, n, width, scrollx;
3778 	int width0 = 0, width1 = 0, width2 = 0;
3779 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3780 
3781 	*wtotal = 0;
3782 
3783 	rms = regmatch->rm_so;
3784 	rme = regmatch->rm_eo;
3785 
3786 	err = expand_tab(&exstr, line);
3787 	if (err)
3788 		return err;
3789 
3790 	/* Split the line into 3 segments, according to match offsets. */
3791 	seg0 = strndup(exstr, rms);
3792 	if (seg0 == NULL) {
3793 		err = got_error_from_errno("strndup");
3794 		goto done;
3795 	}
3796 	seg1 = strndup(exstr + rms, rme - rms);
3797 	if (seg1 == NULL) {
3798 		err = got_error_from_errno("strndup");
3799 		goto done;
3800 	}
3801 	seg2 = strdup(exstr + rme);
3802 	if (seg2 == NULL) {
3803 		err = got_error_from_errno("strndup");
3804 		goto done;
3805 	}
3806 
3807 	/* draw up to matched token if we haven't scrolled past it */
3808 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3809 	    col_tab_align, 1);
3810 	if (err)
3811 		goto done;
3812 	n = MAX(width0 - skipcol, 0);
3813 	if (n) {
3814 		free(wline);
3815 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3816 		    wlimit, col_tab_align, 1);
3817 		if (err)
3818 			goto done;
3819 		waddwstr(window, &wline[scrollx]);
3820 		wlimit -= width;
3821 		*wtotal += width;
3822 	}
3823 
3824 	if (wlimit > 0) {
3825 		int i = 0, w = 0;
3826 		size_t wlen;
3827 
3828 		free(wline);
3829 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3830 		    col_tab_align, 1);
3831 		if (err)
3832 			goto done;
3833 		wlen = wcslen(wline);
3834 		while (i < wlen) {
3835 			width = wcwidth(wline[i]);
3836 			if (width == -1) {
3837 				/* should not happen, tabs are expanded */
3838 				err = got_error(GOT_ERR_RANGE);
3839 				goto done;
3840 			}
3841 			if (width0 + w + width > skipcol)
3842 				break;
3843 			w += width;
3844 			i++;
3845 		}
3846 		/* draw (visible part of) matched token (if scrolled into it) */
3847 		if (width1 - w > 0) {
3848 			wattron(window, A_STANDOUT);
3849 			waddwstr(window, &wline[i]);
3850 			wattroff(window, A_STANDOUT);
3851 			wlimit -= (width1 - w);
3852 			*wtotal += (width1 - w);
3853 		}
3854 	}
3855 
3856 	if (wlimit > 0) {  /* draw rest of line */
3857 		free(wline);
3858 		if (skipcol > width0 + width1) {
3859 			err = format_line(&wline, &width2, &scrollx, seg2,
3860 			    skipcol - (width0 + width1), wlimit,
3861 			    col_tab_align, 1);
3862 			if (err)
3863 				goto done;
3864 			waddwstr(window, &wline[scrollx]);
3865 		} else {
3866 			err = format_line(&wline, &width2, NULL, seg2, 0,
3867 			    wlimit, col_tab_align, 1);
3868 			if (err)
3869 				goto done;
3870 			waddwstr(window, wline);
3871 		}
3872 		*wtotal += width2;
3873 	}
3874 done:
3875 	free(wline);
3876 	free(exstr);
3877 	free(seg0);
3878 	free(seg1);
3879 	free(seg2);
3880 	return err;
3881 }
3882 
3883 static const struct got_error *
3884 draw_file(struct tog_view *view, const char *header)
3885 {
3886 	struct tog_diff_view_state *s = &view->state.diff;
3887 	regmatch_t *regmatch = &view->regmatch;
3888 	const struct got_error *err;
3889 	int nprinted = 0;
3890 	char *line;
3891 	size_t linesize = 0;
3892 	ssize_t linelen;
3893 	struct tog_color *tc;
3894 	wchar_t *wline;
3895 	int width;
3896 	int max_lines = view->nlines;
3897 	int nlines = s->nlines;
3898 	off_t line_offset;
3899 
3900 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3901 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3902 		return got_error_from_errno("fseek");
3903 
3904 	werase(view->window);
3905 
3906 	if (header) {
3907 		if (asprintf(&line, "[%d/%d] %s",
3908 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3909 		    header) == -1)
3910 			return got_error_from_errno("asprintf");
3911 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3912 		    0, 0);
3913 		free(line);
3914 		if (err)
3915 			return err;
3916 
3917 		if (view_needs_focus_indication(view))
3918 			wstandout(view->window);
3919 		waddwstr(view->window, wline);
3920 		free(wline);
3921 		wline = NULL;
3922 		if (view_needs_focus_indication(view))
3923 			wstandend(view->window);
3924 		if (width <= view->ncols - 1)
3925 			waddch(view->window, '\n');
3926 
3927 		if (max_lines <= 1)
3928 			return NULL;
3929 		max_lines--;
3930 	}
3931 
3932 	s->eof = 0;
3933 	view->maxx = 0;
3934 	line = NULL;
3935 	while (max_lines > 0 && nprinted < max_lines) {
3936 		linelen = getline(&line, &linesize, s->f);
3937 		if (linelen == -1) {
3938 			if (feof(s->f)) {
3939 				s->eof = 1;
3940 				break;
3941 			}
3942 			free(line);
3943 			return got_ferror(s->f, GOT_ERR_IO);
3944 		}
3945 
3946 		/* Set view->maxx based on full line length. */
3947 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3948 		    view->x ? 1 : 0);
3949 		if (err) {
3950 			free(line);
3951 			return err;
3952 		}
3953 		view->maxx = MAX(view->maxx, width);
3954 		free(wline);
3955 		wline = NULL;
3956 
3957 		tc = match_color(&s->colors, line);
3958 		if (tc)
3959 			wattr_on(view->window,
3960 			    COLOR_PAIR(tc->colorpair), NULL);
3961 		if (s->first_displayed_line + nprinted == s->matched_line &&
3962 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3963 			err = add_matched_line(&width, line, view->ncols, 0,
3964 			    view->window, view->x, regmatch);
3965 			if (err) {
3966 				free(line);
3967 				return err;
3968 			}
3969 		} else {
3970 			int skip;
3971 			err = format_line(&wline, &width, &skip, line,
3972 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3973 			if (err) {
3974 				free(line);
3975 				return err;
3976 			}
3977 			waddwstr(view->window, &wline[skip]);
3978 			free(wline);
3979 			wline = NULL;
3980 		}
3981 		if (tc)
3982 			wattr_off(view->window,
3983 			    COLOR_PAIR(tc->colorpair), NULL);
3984 		if (width <= view->ncols - 1)
3985 			waddch(view->window, '\n');
3986 		nprinted++;
3987 	}
3988 	free(line);
3989 	if (nprinted >= 1)
3990 		s->last_displayed_line = s->first_displayed_line +
3991 		    (nprinted - 1);
3992 	else
3993 		s->last_displayed_line = s->first_displayed_line;
3994 
3995 	view_border(view);
3996 
3997 	if (s->eof) {
3998 		while (nprinted < view->nlines) {
3999 			waddch(view->window, '\n');
4000 			nprinted++;
4001 		}
4002 
4003 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4004 		    view->ncols, 0, 0);
4005 		if (err) {
4006 			return err;
4007 		}
4008 
4009 		wstandout(view->window);
4010 		waddwstr(view->window, wline);
4011 		free(wline);
4012 		wline = NULL;
4013 		wstandend(view->window);
4014 	}
4015 
4016 	return NULL;
4017 }
4018 
4019 static char *
4020 get_datestr(time_t *time, char *datebuf)
4021 {
4022 	struct tm mytm, *tm;
4023 	char *p, *s;
4024 
4025 	tm = gmtime_r(time, &mytm);
4026 	if (tm == NULL)
4027 		return NULL;
4028 	s = asctime_r(tm, datebuf);
4029 	if (s == NULL)
4030 		return NULL;
4031 	p = strchr(s, '\n');
4032 	if (p)
4033 		*p = '\0';
4034 	return s;
4035 }
4036 
4037 static const struct got_error *
4038 get_changed_paths(struct got_pathlist_head *paths,
4039     struct got_commit_object *commit, struct got_repository *repo)
4040 {
4041 	const struct got_error *err = NULL;
4042 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4043 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4044 	struct got_object_qid *qid;
4045 
4046 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4047 	if (qid != NULL) {
4048 		struct got_commit_object *pcommit;
4049 		err = got_object_open_as_commit(&pcommit, repo,
4050 		    &qid->id);
4051 		if (err)
4052 			return err;
4053 
4054 		tree_id1 = got_object_id_dup(
4055 		    got_object_commit_get_tree_id(pcommit));
4056 		if (tree_id1 == NULL) {
4057 			got_object_commit_close(pcommit);
4058 			return got_error_from_errno("got_object_id_dup");
4059 		}
4060 		got_object_commit_close(pcommit);
4061 
4062 	}
4063 
4064 	if (tree_id1) {
4065 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4066 		if (err)
4067 			goto done;
4068 	}
4069 
4070 	tree_id2 = got_object_commit_get_tree_id(commit);
4071 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4072 	if (err)
4073 		goto done;
4074 
4075 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4076 	    got_diff_tree_collect_changed_paths, paths, 0);
4077 done:
4078 	if (tree1)
4079 		got_object_tree_close(tree1);
4080 	if (tree2)
4081 		got_object_tree_close(tree2);
4082 	free(tree_id1);
4083 	return err;
4084 }
4085 
4086 static const struct got_error *
4087 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
4088 {
4089 	off_t *p;
4090 
4091 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
4092 	if (p == NULL)
4093 		return got_error_from_errno("reallocarray");
4094 	*line_offsets = p;
4095 	(*line_offsets)[*nlines] = off;
4096 	(*nlines)++;
4097 	return NULL;
4098 }
4099 
4100 static const struct got_error *
4101 write_commit_info(off_t **line_offsets, size_t *nlines,
4102     struct got_object_id *commit_id, struct got_reflist_head *refs,
4103     struct got_repository *repo, FILE *outfile)
4104 {
4105 	const struct got_error *err = NULL;
4106 	char datebuf[26], *datestr;
4107 	struct got_commit_object *commit;
4108 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4109 	time_t committer_time;
4110 	const char *author, *committer;
4111 	char *refs_str = NULL;
4112 	struct got_pathlist_head changed_paths;
4113 	struct got_pathlist_entry *pe;
4114 	off_t outoff = 0;
4115 	int n;
4116 
4117 	TAILQ_INIT(&changed_paths);
4118 
4119 	if (refs) {
4120 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4121 		if (err)
4122 			return err;
4123 	}
4124 
4125 	err = got_object_open_as_commit(&commit, repo, commit_id);
4126 	if (err)
4127 		return err;
4128 
4129 	err = got_object_id_str(&id_str, commit_id);
4130 	if (err) {
4131 		err = got_error_from_errno("got_object_id_str");
4132 		goto done;
4133 	}
4134 
4135 	err = add_line_offset(line_offsets, nlines, 0);
4136 	if (err)
4137 		goto done;
4138 
4139 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4140 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4141 	if (n < 0) {
4142 		err = got_error_from_errno("fprintf");
4143 		goto done;
4144 	}
4145 	outoff += n;
4146 	err = add_line_offset(line_offsets, nlines, outoff);
4147 	if (err)
4148 		goto done;
4149 
4150 	n = fprintf(outfile, "from: %s\n",
4151 	    got_object_commit_get_author(commit));
4152 	if (n < 0) {
4153 		err = got_error_from_errno("fprintf");
4154 		goto done;
4155 	}
4156 	outoff += n;
4157 	err = add_line_offset(line_offsets, nlines, outoff);
4158 	if (err)
4159 		goto done;
4160 
4161 	committer_time = got_object_commit_get_committer_time(commit);
4162 	datestr = get_datestr(&committer_time, datebuf);
4163 	if (datestr) {
4164 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4165 		if (n < 0) {
4166 			err = got_error_from_errno("fprintf");
4167 			goto done;
4168 		}
4169 		outoff += n;
4170 		err = add_line_offset(line_offsets, nlines, outoff);
4171 		if (err)
4172 			goto done;
4173 	}
4174 	author = got_object_commit_get_author(commit);
4175 	committer = got_object_commit_get_committer(commit);
4176 	if (strcmp(author, committer) != 0) {
4177 		n = fprintf(outfile, "via: %s\n", committer);
4178 		if (n < 0) {
4179 			err = got_error_from_errno("fprintf");
4180 			goto done;
4181 		}
4182 		outoff += n;
4183 		err = add_line_offset(line_offsets, nlines, outoff);
4184 		if (err)
4185 			goto done;
4186 	}
4187 	if (got_object_commit_get_nparents(commit) > 1) {
4188 		const struct got_object_id_queue *parent_ids;
4189 		struct got_object_qid *qid;
4190 		int pn = 1;
4191 		parent_ids = got_object_commit_get_parent_ids(commit);
4192 		STAILQ_FOREACH(qid, parent_ids, entry) {
4193 			err = got_object_id_str(&id_str, &qid->id);
4194 			if (err)
4195 				goto done;
4196 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4197 			if (n < 0) {
4198 				err = got_error_from_errno("fprintf");
4199 				goto done;
4200 			}
4201 			outoff += n;
4202 			err = add_line_offset(line_offsets, nlines, outoff);
4203 			if (err)
4204 				goto done;
4205 			free(id_str);
4206 			id_str = NULL;
4207 		}
4208 	}
4209 
4210 	err = got_object_commit_get_logmsg(&logmsg, commit);
4211 	if (err)
4212 		goto done;
4213 	s = logmsg;
4214 	while ((line = strsep(&s, "\n")) != NULL) {
4215 		n = fprintf(outfile, "%s\n", line);
4216 		if (n < 0) {
4217 			err = got_error_from_errno("fprintf");
4218 			goto done;
4219 		}
4220 		outoff += n;
4221 		err = add_line_offset(line_offsets, nlines, outoff);
4222 		if (err)
4223 			goto done;
4224 	}
4225 
4226 	err = get_changed_paths(&changed_paths, commit, repo);
4227 	if (err)
4228 		goto done;
4229 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4230 		struct got_diff_changed_path *cp = pe->data;
4231 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4232 		if (n < 0) {
4233 			err = got_error_from_errno("fprintf");
4234 			goto done;
4235 		}
4236 		outoff += n;
4237 		err = add_line_offset(line_offsets, nlines, outoff);
4238 		if (err)
4239 			goto done;
4240 		free((char *)pe->path);
4241 		free(pe->data);
4242 	}
4243 
4244 	fputc('\n', outfile);
4245 	outoff++;
4246 	err = add_line_offset(line_offsets, nlines, outoff);
4247 done:
4248 	got_pathlist_free(&changed_paths);
4249 	free(id_str);
4250 	free(logmsg);
4251 	free(refs_str);
4252 	got_object_commit_close(commit);
4253 	if (err) {
4254 		free(*line_offsets);
4255 		*line_offsets = NULL;
4256 		*nlines = 0;
4257 	}
4258 	return err;
4259 }
4260 
4261 static const struct got_error *
4262 create_diff(struct tog_diff_view_state *s)
4263 {
4264 	const struct got_error *err = NULL;
4265 	FILE *f = NULL;
4266 	int obj_type;
4267 
4268 	free(s->line_offsets);
4269 	s->line_offsets = malloc(sizeof(off_t));
4270 	if (s->line_offsets == NULL)
4271 		return got_error_from_errno("malloc");
4272 	s->nlines = 0;
4273 
4274 	f = got_opentemp();
4275 	if (f == NULL) {
4276 		err = got_error_from_errno("got_opentemp");
4277 		goto done;
4278 	}
4279 	if (s->f && fclose(s->f) == EOF) {
4280 		err = got_error_from_errno("fclose");
4281 		goto done;
4282 	}
4283 	s->f = f;
4284 
4285 	if (s->id1)
4286 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4287 	else
4288 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4289 	if (err)
4290 		goto done;
4291 
4292 	switch (obj_type) {
4293 	case GOT_OBJ_TYPE_BLOB:
4294 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
4295 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4296 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4297 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4298 		break;
4299 	case GOT_OBJ_TYPE_TREE:
4300 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
4301 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4302 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4303 		    s->force_text_diff, s->repo, s->f);
4304 		break;
4305 	case GOT_OBJ_TYPE_COMMIT: {
4306 		const struct got_object_id_queue *parent_ids;
4307 		struct got_object_qid *pid;
4308 		struct got_commit_object *commit2;
4309 		struct got_reflist_head *refs;
4310 
4311 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4312 		if (err)
4313 			goto done;
4314 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4315 		/* Show commit info if we're diffing to a parent/root commit. */
4316 		if (s->id1 == NULL) {
4317 			err = write_commit_info(&s->line_offsets, &s->nlines,
4318 			    s->id2, refs, s->repo, s->f);
4319 			if (err)
4320 				goto done;
4321 		} else {
4322 			parent_ids = got_object_commit_get_parent_ids(commit2);
4323 			STAILQ_FOREACH(pid, parent_ids, entry) {
4324 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4325 					err = write_commit_info(
4326 					    &s->line_offsets, &s->nlines,
4327 					    s->id2, refs, s->repo, s->f);
4328 					if (err)
4329 						goto done;
4330 					break;
4331 				}
4332 			}
4333 		}
4334 		got_object_commit_close(commit2);
4335 
4336 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4337 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4338 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4339 		    s->force_text_diff, s->repo, s->f);
4340 		break;
4341 	}
4342 	default:
4343 		err = got_error(GOT_ERR_OBJ_TYPE);
4344 		break;
4345 	}
4346 	if (err)
4347 		goto done;
4348 done:
4349 	if (s->f && fflush(s->f) != 0 && err == NULL)
4350 		err = got_error_from_errno("fflush");
4351 	return err;
4352 }
4353 
4354 static void
4355 diff_view_indicate_progress(struct tog_view *view)
4356 {
4357 	mvwaddstr(view->window, 0, 0, "diffing...");
4358 	update_panels();
4359 	doupdate();
4360 }
4361 
4362 static const struct got_error *
4363 search_start_diff_view(struct tog_view *view)
4364 {
4365 	struct tog_diff_view_state *s = &view->state.diff;
4366 
4367 	s->matched_line = 0;
4368 	return NULL;
4369 }
4370 
4371 static const struct got_error *
4372 search_next_diff_view(struct tog_view *view)
4373 {
4374 	struct tog_diff_view_state *s = &view->state.diff;
4375 	const struct got_error *err = NULL;
4376 	int lineno;
4377 	char *line = NULL;
4378 	size_t linesize = 0;
4379 	ssize_t linelen;
4380 
4381 	if (!view->searching) {
4382 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4383 		return NULL;
4384 	}
4385 
4386 	if (s->matched_line) {
4387 		if (view->searching == TOG_SEARCH_FORWARD)
4388 			lineno = s->matched_line + 1;
4389 		else
4390 			lineno = s->matched_line - 1;
4391 	} else
4392 		lineno = s->first_displayed_line;
4393 
4394 	while (1) {
4395 		off_t offset;
4396 
4397 		if (lineno <= 0 || lineno > s->nlines) {
4398 			if (s->matched_line == 0) {
4399 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4400 				break;
4401 			}
4402 
4403 			if (view->searching == TOG_SEARCH_FORWARD)
4404 				lineno = 1;
4405 			else
4406 				lineno = s->nlines;
4407 		}
4408 
4409 		offset = s->line_offsets[lineno - 1];
4410 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4411 			free(line);
4412 			return got_error_from_errno("fseeko");
4413 		}
4414 		linelen = getline(&line, &linesize, s->f);
4415 		if (linelen != -1) {
4416 			char *exstr;
4417 			err = expand_tab(&exstr, line);
4418 			if (err)
4419 				break;
4420 			if (match_line(exstr, &view->regex, 1,
4421 			    &view->regmatch)) {
4422 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4423 				s->matched_line = lineno;
4424 				free(exstr);
4425 				break;
4426 			}
4427 			free(exstr);
4428 		}
4429 		if (view->searching == TOG_SEARCH_FORWARD)
4430 			lineno++;
4431 		else
4432 			lineno--;
4433 	}
4434 	free(line);
4435 
4436 	if (s->matched_line) {
4437 		s->first_displayed_line = s->matched_line;
4438 		s->selected_line = 1;
4439 	}
4440 
4441 	return err;
4442 }
4443 
4444 static const struct got_error *
4445 close_diff_view(struct tog_view *view)
4446 {
4447 	const struct got_error *err = NULL;
4448 	struct tog_diff_view_state *s = &view->state.diff;
4449 
4450 	free(s->id1);
4451 	s->id1 = NULL;
4452 	free(s->id2);
4453 	s->id2 = NULL;
4454 	if (s->f && fclose(s->f) == EOF)
4455 		err = got_error_from_errno("fclose");
4456 	s->f = NULL;
4457 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4458 		err = got_error_from_errno("fclose");
4459 	s->f1 = NULL;
4460 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4461 		err = got_error_from_errno("fclose");
4462 	s->f2 = NULL;
4463 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4464 		err = got_error_from_errno("close");
4465 	s->fd1 = -1;
4466 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4467 		err = got_error_from_errno("close");
4468 	s->fd2 = -1;
4469 	free_colors(&s->colors);
4470 	free(s->line_offsets);
4471 	s->line_offsets = NULL;
4472 	s->nlines = 0;
4473 	return err;
4474 }
4475 
4476 static const struct got_error *
4477 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4478     struct got_object_id *id2, const char *label1, const char *label2,
4479     int diff_context, int ignore_whitespace, int force_text_diff,
4480     struct tog_view *parent_view, struct got_repository *repo)
4481 {
4482 	const struct got_error *err;
4483 	struct tog_diff_view_state *s = &view->state.diff;
4484 
4485 	memset(s, 0, sizeof(*s));
4486 	s->fd1 = -1;
4487 	s->fd2 = -1;
4488 
4489 	if (id1 != NULL && id2 != NULL) {
4490 	    int type1, type2;
4491 	    err = got_object_get_type(&type1, repo, id1);
4492 	    if (err)
4493 		return err;
4494 	    err = got_object_get_type(&type2, repo, id2);
4495 	    if (err)
4496 		return err;
4497 
4498 	    if (type1 != type2)
4499 		return got_error(GOT_ERR_OBJ_TYPE);
4500 	}
4501 	s->first_displayed_line = 1;
4502 	s->last_displayed_line = view->nlines;
4503 	s->selected_line = 1;
4504 	s->repo = repo;
4505 	s->id1 = id1;
4506 	s->id2 = id2;
4507 	s->label1 = label1;
4508 	s->label2 = label2;
4509 
4510 	if (id1) {
4511 		s->id1 = got_object_id_dup(id1);
4512 		if (s->id1 == NULL)
4513 			return got_error_from_errno("got_object_id_dup");
4514 	} else
4515 		s->id1 = NULL;
4516 
4517 	s->id2 = got_object_id_dup(id2);
4518 	if (s->id2 == NULL) {
4519 		err = got_error_from_errno("got_object_id_dup");
4520 		goto done;
4521 	}
4522 
4523 	s->f1 = got_opentemp();
4524 	if (s->f1 == NULL) {
4525 		err = got_error_from_errno("got_opentemp");
4526 		goto done;
4527 	}
4528 
4529 	s->f2 = got_opentemp();
4530 	if (s->f2 == NULL) {
4531 		err = got_error_from_errno("got_opentemp");
4532 		goto done;
4533 	}
4534 
4535 	s->fd1 = got_opentempfd();
4536 	if (s->fd1 == -1) {
4537 		err = got_error_from_errno("got_opentempfd");
4538 		goto done;
4539 	}
4540 
4541 	s->fd2 = got_opentempfd();
4542 	if (s->fd2 == -1) {
4543 		err = got_error_from_errno("got_opentempfd");
4544 		goto done;
4545 	}
4546 
4547 	s->first_displayed_line = 1;
4548 	s->last_displayed_line = view->nlines;
4549 	s->diff_context = diff_context;
4550 	s->ignore_whitespace = ignore_whitespace;
4551 	s->force_text_diff = force_text_diff;
4552 	s->parent_view = parent_view;
4553 	s->repo = repo;
4554 
4555 	STAILQ_INIT(&s->colors);
4556 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4557 		err = add_color(&s->colors,
4558 		    "^-", TOG_COLOR_DIFF_MINUS,
4559 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4560 		if (err)
4561 			goto done;
4562 		err = add_color(&s->colors, "^\\+",
4563 		    TOG_COLOR_DIFF_PLUS,
4564 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4565 		if (err)
4566 			goto done;
4567 		err = add_color(&s->colors,
4568 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4569 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4570 		if (err)
4571 			goto done;
4572 
4573 		err = add_color(&s->colors,
4574 		    "^(commit [0-9a-f]|parent [0-9]|"
4575 		    "(blob|file|tree|commit) [-+] |"
4576 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4577 		    get_color_value("TOG_COLOR_DIFF_META"));
4578 		if (err)
4579 			goto done;
4580 
4581 		err = add_color(&s->colors,
4582 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4583 		    get_color_value("TOG_COLOR_AUTHOR"));
4584 		if (err)
4585 			goto done;
4586 
4587 		err = add_color(&s->colors,
4588 		    "^date: ", TOG_COLOR_DATE,
4589 		    get_color_value("TOG_COLOR_DATE"));
4590 		if (err)
4591 			goto done;
4592 	}
4593 
4594 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4595 	    view_is_splitscreen(view))
4596 		show_log_view(parent_view); /* draw border */
4597 	diff_view_indicate_progress(view);
4598 
4599 	err = create_diff(s);
4600 
4601 	view->show = show_diff_view;
4602 	view->input = input_diff_view;
4603 	view->reset = reset_diff_view;
4604 	view->close = close_diff_view;
4605 	view->search_start = search_start_diff_view;
4606 	view->search_next = search_next_diff_view;
4607 done:
4608 	if (err)
4609 		close_diff_view(view);
4610 	return err;
4611 }
4612 
4613 static const struct got_error *
4614 show_diff_view(struct tog_view *view)
4615 {
4616 	const struct got_error *err;
4617 	struct tog_diff_view_state *s = &view->state.diff;
4618 	char *id_str1 = NULL, *id_str2, *header;
4619 	const char *label1, *label2;
4620 
4621 	if (s->id1) {
4622 		err = got_object_id_str(&id_str1, s->id1);
4623 		if (err)
4624 			return err;
4625 		label1 = s->label1 ? : id_str1;
4626 	} else
4627 		label1 = "/dev/null";
4628 
4629 	err = got_object_id_str(&id_str2, s->id2);
4630 	if (err)
4631 		return err;
4632 	label2 = s->label2 ? : id_str2;
4633 
4634 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4635 		err = got_error_from_errno("asprintf");
4636 		free(id_str1);
4637 		free(id_str2);
4638 		return err;
4639 	}
4640 	free(id_str1);
4641 	free(id_str2);
4642 
4643 	err = draw_file(view, header);
4644 	free(header);
4645 	return err;
4646 }
4647 
4648 static const struct got_error *
4649 set_selected_commit(struct tog_diff_view_state *s,
4650     struct commit_queue_entry *entry)
4651 {
4652 	const struct got_error *err;
4653 	const struct got_object_id_queue *parent_ids;
4654 	struct got_commit_object *selected_commit;
4655 	struct got_object_qid *pid;
4656 
4657 	free(s->id2);
4658 	s->id2 = got_object_id_dup(entry->id);
4659 	if (s->id2 == NULL)
4660 		return got_error_from_errno("got_object_id_dup");
4661 
4662 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4663 	if (err)
4664 		return err;
4665 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4666 	free(s->id1);
4667 	pid = STAILQ_FIRST(parent_ids);
4668 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4669 	got_object_commit_close(selected_commit);
4670 	return NULL;
4671 }
4672 
4673 static const struct got_error *
4674 reset_diff_view(struct tog_view *view)
4675 {
4676 	struct tog_diff_view_state *s = &view->state.diff;
4677 
4678 	view->count = 0;
4679 	wclear(view->window);
4680 	s->first_displayed_line = 1;
4681 	s->last_displayed_line = view->nlines;
4682 	s->matched_line = 0;
4683 	diff_view_indicate_progress(view);
4684 	return create_diff(s);
4685 }
4686 
4687 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4688     int, int, int);
4689 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4690     int, int);
4691 
4692 static const struct got_error *
4693 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4694 {
4695 	const struct got_error *err = NULL;
4696 	struct tog_diff_view_state *s = &view->state.diff;
4697 	struct tog_log_view_state *ls;
4698 	struct commit_queue_entry *old_selected_entry;
4699 	char *line = NULL;
4700 	size_t linesize = 0;
4701 	ssize_t linelen;
4702 	int i, nscroll = view->nlines - 1, up = 0;
4703 
4704 	switch (ch) {
4705 	case '0':
4706 		view->x = 0;
4707 		break;
4708 	case '$':
4709 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4710 		view->count = 0;
4711 		break;
4712 	case KEY_RIGHT:
4713 	case 'l':
4714 		if (view->x + view->ncols / 3 < view->maxx)
4715 			view->x += 2;  /* move two columns right */
4716 		else
4717 			view->count = 0;
4718 		break;
4719 	case KEY_LEFT:
4720 	case 'h':
4721 		view->x -= MIN(view->x, 2);  /* move two columns back */
4722 		if (view->x <= 0)
4723 			view->count = 0;
4724 		break;
4725 	case 'a':
4726 	case 'w':
4727 		if (ch == 'a')
4728 			s->force_text_diff = !s->force_text_diff;
4729 		if (ch == 'w')
4730 			s->ignore_whitespace = !s->ignore_whitespace;
4731 		err = reset_diff_view(view);
4732 		break;
4733 	case 'g':
4734 	case KEY_HOME:
4735 		s->first_displayed_line = 1;
4736 		view->count = 0;
4737 		break;
4738 	case 'G':
4739 	case KEY_END:
4740 		view->count = 0;
4741 		if (s->eof)
4742 			break;
4743 
4744 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4745 		s->eof = 1;
4746 		break;
4747 	case 'k':
4748 	case KEY_UP:
4749 	case CTRL('p'):
4750 		if (s->first_displayed_line > 1)
4751 			s->first_displayed_line--;
4752 		else
4753 			view->count = 0;
4754 		break;
4755 	case CTRL('u'):
4756 	case 'u':
4757 		nscroll /= 2;
4758 		/* FALL THROUGH */
4759 	case KEY_PPAGE:
4760 	case CTRL('b'):
4761 	case 'b':
4762 		if (s->first_displayed_line == 1) {
4763 			view->count = 0;
4764 			break;
4765 		}
4766 		i = 0;
4767 		while (i++ < nscroll && s->first_displayed_line > 1)
4768 			s->first_displayed_line--;
4769 		break;
4770 	case 'j':
4771 	case KEY_DOWN:
4772 	case CTRL('n'):
4773 		if (!s->eof)
4774 			s->first_displayed_line++;
4775 		else
4776 			view->count = 0;
4777 		break;
4778 	case CTRL('d'):
4779 	case 'd':
4780 		nscroll /= 2;
4781 		/* FALL THROUGH */
4782 	case KEY_NPAGE:
4783 	case CTRL('f'):
4784 	case 'f':
4785 	case ' ':
4786 		if (s->eof) {
4787 			view->count = 0;
4788 			break;
4789 		}
4790 		i = 0;
4791 		while (!s->eof && i++ < nscroll) {
4792 			linelen = getline(&line, &linesize, s->f);
4793 			s->first_displayed_line++;
4794 			if (linelen == -1) {
4795 				if (feof(s->f)) {
4796 					s->eof = 1;
4797 				} else
4798 					err = got_ferror(s->f, GOT_ERR_IO);
4799 				break;
4800 			}
4801 		}
4802 		free(line);
4803 		break;
4804 	case '[':
4805 		if (s->diff_context > 0) {
4806 			s->diff_context--;
4807 			s->matched_line = 0;
4808 			diff_view_indicate_progress(view);
4809 			err = create_diff(s);
4810 			if (s->first_displayed_line + view->nlines - 1 >
4811 			    s->nlines) {
4812 				s->first_displayed_line = 1;
4813 				s->last_displayed_line = view->nlines;
4814 			}
4815 		} else
4816 			view->count = 0;
4817 		break;
4818 	case ']':
4819 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4820 			s->diff_context++;
4821 			s->matched_line = 0;
4822 			diff_view_indicate_progress(view);
4823 			err = create_diff(s);
4824 		} else
4825 			view->count = 0;
4826 		break;
4827 	case '<':
4828 	case ',':
4829 	case 'K':
4830 		up = 1;
4831 		/* FALL THROUGH */
4832 	case '>':
4833 	case '.':
4834 	case 'J':
4835 		if (s->parent_view == NULL) {
4836 			view->count = 0;
4837 			break;
4838 		}
4839 		s->parent_view->count = view->count;
4840 
4841 		if (s->parent_view->type == TOG_VIEW_LOG) {
4842 			ls = &s->parent_view->state.log;
4843 			old_selected_entry = ls->selected_entry;
4844 
4845 			err = input_log_view(NULL, s->parent_view,
4846 			    up ? KEY_UP : KEY_DOWN);
4847 			if (err)
4848 				break;
4849 			view->count = s->parent_view->count;
4850 
4851 			if (old_selected_entry == ls->selected_entry)
4852 				break;
4853 
4854 			err = set_selected_commit(s, ls->selected_entry);
4855 			if (err)
4856 				break;
4857 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4858 			struct tog_blame_view_state *bs;
4859 			struct got_object_id *id, *prev_id;
4860 
4861 			bs = &s->parent_view->state.blame;
4862 			prev_id = get_annotation_for_line(bs->blame.lines,
4863 			    bs->blame.nlines, bs->last_diffed_line);
4864 
4865 			err = input_blame_view(&view, s->parent_view,
4866 			    up ? KEY_UP : KEY_DOWN);
4867 			if (err)
4868 				break;
4869 			view->count = s->parent_view->count;
4870 
4871 			if (prev_id == NULL)
4872 				break;
4873 			id = get_selected_commit_id(bs->blame.lines,
4874 			    bs->blame.nlines, bs->first_displayed_line,
4875 			    bs->selected_line);
4876 			if (id == NULL)
4877 				break;
4878 
4879 			if (!got_object_id_cmp(prev_id, id))
4880 				break;
4881 
4882 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
4883 			if (err)
4884 				break;
4885 		}
4886 		s->first_displayed_line = 1;
4887 		s->last_displayed_line = view->nlines;
4888 		s->matched_line = 0;
4889 		view->x = 0;
4890 
4891 		diff_view_indicate_progress(view);
4892 		err = create_diff(s);
4893 		break;
4894 	default:
4895 		view->count = 0;
4896 		break;
4897 	}
4898 
4899 	return err;
4900 }
4901 
4902 static const struct got_error *
4903 cmd_diff(int argc, char *argv[])
4904 {
4905 	const struct got_error *error = NULL;
4906 	struct got_repository *repo = NULL;
4907 	struct got_worktree *worktree = NULL;
4908 	struct got_object_id *id1 = NULL, *id2 = NULL;
4909 	char *repo_path = NULL, *cwd = NULL;
4910 	char *id_str1 = NULL, *id_str2 = NULL;
4911 	char *label1 = NULL, *label2 = NULL;
4912 	int diff_context = 3, ignore_whitespace = 0;
4913 	int ch, force_text_diff = 0;
4914 	const char *errstr;
4915 	struct tog_view *view;
4916 	int *pack_fds = NULL;
4917 
4918 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4919 		switch (ch) {
4920 		case 'a':
4921 			force_text_diff = 1;
4922 			break;
4923 		case 'C':
4924 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4925 			    &errstr);
4926 			if (errstr != NULL)
4927 				errx(1, "number of context lines is %s: %s",
4928 				    errstr, errstr);
4929 			break;
4930 		case 'r':
4931 			repo_path = realpath(optarg, NULL);
4932 			if (repo_path == NULL)
4933 				return got_error_from_errno2("realpath",
4934 				    optarg);
4935 			got_path_strip_trailing_slashes(repo_path);
4936 			break;
4937 		case 'w':
4938 			ignore_whitespace = 1;
4939 			break;
4940 		default:
4941 			usage_diff();
4942 			/* NOTREACHED */
4943 		}
4944 	}
4945 
4946 	argc -= optind;
4947 	argv += optind;
4948 
4949 	if (argc == 0) {
4950 		usage_diff(); /* TODO show local worktree changes */
4951 	} else if (argc == 2) {
4952 		id_str1 = argv[0];
4953 		id_str2 = argv[1];
4954 	} else
4955 		usage_diff();
4956 
4957 	error = got_repo_pack_fds_open(&pack_fds);
4958 	if (error)
4959 		goto done;
4960 
4961 	if (repo_path == NULL) {
4962 		cwd = getcwd(NULL, 0);
4963 		if (cwd == NULL)
4964 			return got_error_from_errno("getcwd");
4965 		error = got_worktree_open(&worktree, cwd);
4966 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4967 			goto done;
4968 		if (worktree)
4969 			repo_path =
4970 			    strdup(got_worktree_get_repo_path(worktree));
4971 		else
4972 			repo_path = strdup(cwd);
4973 		if (repo_path == NULL) {
4974 			error = got_error_from_errno("strdup");
4975 			goto done;
4976 		}
4977 	}
4978 
4979 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4980 	if (error)
4981 		goto done;
4982 
4983 	init_curses();
4984 
4985 	error = apply_unveil(got_repo_get_path(repo), NULL);
4986 	if (error)
4987 		goto done;
4988 
4989 	error = tog_load_refs(repo, 0);
4990 	if (error)
4991 		goto done;
4992 
4993 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4994 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4995 	if (error)
4996 		goto done;
4997 
4998 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4999 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5000 	if (error)
5001 		goto done;
5002 
5003 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5004 	if (view == NULL) {
5005 		error = got_error_from_errno("view_open");
5006 		goto done;
5007 	}
5008 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5009 	    ignore_whitespace, force_text_diff, NULL,  repo);
5010 	if (error)
5011 		goto done;
5012 	error = view_loop(view);
5013 done:
5014 	free(label1);
5015 	free(label2);
5016 	free(repo_path);
5017 	free(cwd);
5018 	if (repo) {
5019 		const struct got_error *close_err = got_repo_close(repo);
5020 		if (error == NULL)
5021 			error = close_err;
5022 	}
5023 	if (worktree)
5024 		got_worktree_close(worktree);
5025 	if (pack_fds) {
5026 		const struct got_error *pack_err =
5027 		    got_repo_pack_fds_close(pack_fds);
5028 		if (error == NULL)
5029 			error = pack_err;
5030 	}
5031 	tog_free_refs();
5032 	return error;
5033 }
5034 
5035 __dead static void
5036 usage_blame(void)
5037 {
5038 	endwin();
5039 	fprintf(stderr,
5040 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5041 	    getprogname());
5042 	exit(1);
5043 }
5044 
5045 struct tog_blame_line {
5046 	int annotated;
5047 	struct got_object_id *id;
5048 };
5049 
5050 static const struct got_error *
5051 draw_blame(struct tog_view *view)
5052 {
5053 	struct tog_blame_view_state *s = &view->state.blame;
5054 	struct tog_blame *blame = &s->blame;
5055 	regmatch_t *regmatch = &view->regmatch;
5056 	const struct got_error *err;
5057 	int lineno = 0, nprinted = 0;
5058 	char *line = NULL;
5059 	size_t linesize = 0;
5060 	ssize_t linelen;
5061 	wchar_t *wline;
5062 	int width;
5063 	struct tog_blame_line *blame_line;
5064 	struct got_object_id *prev_id = NULL;
5065 	char *id_str;
5066 	struct tog_color *tc;
5067 
5068 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5069 	if (err)
5070 		return err;
5071 
5072 	rewind(blame->f);
5073 	werase(view->window);
5074 
5075 	if (asprintf(&line, "commit %s", id_str) == -1) {
5076 		err = got_error_from_errno("asprintf");
5077 		free(id_str);
5078 		return err;
5079 	}
5080 
5081 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5082 	free(line);
5083 	line = NULL;
5084 	if (err)
5085 		return err;
5086 	if (view_needs_focus_indication(view))
5087 		wstandout(view->window);
5088 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5089 	if (tc)
5090 		wattr_on(view->window,
5091 		    COLOR_PAIR(tc->colorpair), NULL);
5092 	waddwstr(view->window, wline);
5093 	if (tc)
5094 		wattr_off(view->window,
5095 		    COLOR_PAIR(tc->colorpair), NULL);
5096 	if (view_needs_focus_indication(view))
5097 		wstandend(view->window);
5098 	free(wline);
5099 	wline = NULL;
5100 	if (width < view->ncols - 1)
5101 		waddch(view->window, '\n');
5102 
5103 	if (asprintf(&line, "[%d/%d] %s%s",
5104 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5105 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5106 		free(id_str);
5107 		return got_error_from_errno("asprintf");
5108 	}
5109 	free(id_str);
5110 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5111 	free(line);
5112 	line = NULL;
5113 	if (err)
5114 		return err;
5115 	waddwstr(view->window, wline);
5116 	free(wline);
5117 	wline = NULL;
5118 	if (width < view->ncols - 1)
5119 		waddch(view->window, '\n');
5120 
5121 	s->eof = 0;
5122 	view->maxx = 0;
5123 	while (nprinted < view->nlines - 2) {
5124 		linelen = getline(&line, &linesize, blame->f);
5125 		if (linelen == -1) {
5126 			if (feof(blame->f)) {
5127 				s->eof = 1;
5128 				break;
5129 			}
5130 			free(line);
5131 			return got_ferror(blame->f, GOT_ERR_IO);
5132 		}
5133 		if (++lineno < s->first_displayed_line)
5134 			continue;
5135 
5136 		/* Set view->maxx based on full line length. */
5137 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5138 		if (err) {
5139 			free(line);
5140 			return err;
5141 		}
5142 		free(wline);
5143 		wline = NULL;
5144 		view->maxx = MAX(view->maxx, width);
5145 
5146 		if (nprinted == s->selected_line - 1)
5147 			wstandout(view->window);
5148 
5149 		if (blame->nlines > 0) {
5150 			blame_line = &blame->lines[lineno - 1];
5151 			if (blame_line->annotated && prev_id &&
5152 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5153 			    !(nprinted == s->selected_line - 1)) {
5154 				waddstr(view->window, "        ");
5155 			} else if (blame_line->annotated) {
5156 				char *id_str;
5157 				err = got_object_id_str(&id_str,
5158 				    blame_line->id);
5159 				if (err) {
5160 					free(line);
5161 					return err;
5162 				}
5163 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5164 				if (tc)
5165 					wattr_on(view->window,
5166 					    COLOR_PAIR(tc->colorpair), NULL);
5167 				wprintw(view->window, "%.8s", id_str);
5168 				if (tc)
5169 					wattr_off(view->window,
5170 					    COLOR_PAIR(tc->colorpair), NULL);
5171 				free(id_str);
5172 				prev_id = blame_line->id;
5173 			} else {
5174 				waddstr(view->window, "........");
5175 				prev_id = NULL;
5176 			}
5177 		} else {
5178 			waddstr(view->window, "........");
5179 			prev_id = NULL;
5180 		}
5181 
5182 		if (nprinted == s->selected_line - 1)
5183 			wstandend(view->window);
5184 		waddstr(view->window, " ");
5185 
5186 		if (view->ncols <= 9) {
5187 			width = 9;
5188 		} else if (s->first_displayed_line + nprinted ==
5189 		    s->matched_line &&
5190 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5191 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5192 			    view->window, view->x, regmatch);
5193 			if (err) {
5194 				free(line);
5195 				return err;
5196 			}
5197 			width += 9;
5198 		} else {
5199 			int skip;
5200 			err = format_line(&wline, &width, &skip, line,
5201 			    view->x, view->ncols - 9, 9, 1);
5202 			if (err) {
5203 				free(line);
5204 				return err;
5205 			}
5206 			waddwstr(view->window, &wline[skip]);
5207 			width += 9;
5208 			free(wline);
5209 			wline = NULL;
5210 		}
5211 
5212 		if (width <= view->ncols - 1)
5213 			waddch(view->window, '\n');
5214 		if (++nprinted == 1)
5215 			s->first_displayed_line = lineno;
5216 	}
5217 	free(line);
5218 	s->last_displayed_line = lineno;
5219 
5220 	view_border(view);
5221 
5222 	return NULL;
5223 }
5224 
5225 static const struct got_error *
5226 blame_cb(void *arg, int nlines, int lineno,
5227     struct got_commit_object *commit, struct got_object_id *id)
5228 {
5229 	const struct got_error *err = NULL;
5230 	struct tog_blame_cb_args *a = arg;
5231 	struct tog_blame_line *line;
5232 	int errcode;
5233 
5234 	if (nlines != a->nlines ||
5235 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5236 		return got_error(GOT_ERR_RANGE);
5237 
5238 	errcode = pthread_mutex_lock(&tog_mutex);
5239 	if (errcode)
5240 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5241 
5242 	if (*a->quit) {	/* user has quit the blame view */
5243 		err = got_error(GOT_ERR_ITER_COMPLETED);
5244 		goto done;
5245 	}
5246 
5247 	if (lineno == -1)
5248 		goto done; /* no change in this commit */
5249 
5250 	line = &a->lines[lineno - 1];
5251 	if (line->annotated)
5252 		goto done;
5253 
5254 	line->id = got_object_id_dup(id);
5255 	if (line->id == NULL) {
5256 		err = got_error_from_errno("got_object_id_dup");
5257 		goto done;
5258 	}
5259 	line->annotated = 1;
5260 done:
5261 	errcode = pthread_mutex_unlock(&tog_mutex);
5262 	if (errcode)
5263 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5264 	return err;
5265 }
5266 
5267 static void *
5268 blame_thread(void *arg)
5269 {
5270 	const struct got_error *err, *close_err;
5271 	struct tog_blame_thread_args *ta = arg;
5272 	struct tog_blame_cb_args *a = ta->cb_args;
5273 	int errcode, fd1 = -1, fd2 = -1;
5274 	FILE *f1 = NULL, *f2 = NULL;
5275 
5276 	fd1 = got_opentempfd();
5277 	if (fd1 == -1)
5278 		return (void *)got_error_from_errno("got_opentempfd");
5279 
5280 	fd2 = got_opentempfd();
5281 	if (fd2 == -1) {
5282 		err = got_error_from_errno("got_opentempfd");
5283 		goto done;
5284 	}
5285 
5286 	f1 = got_opentemp();
5287 	if (f1 == NULL) {
5288 		err = (void *)got_error_from_errno("got_opentemp");
5289 		goto done;
5290 	}
5291 	f2 = got_opentemp();
5292 	if (f2 == NULL) {
5293 		err = (void *)got_error_from_errno("got_opentemp");
5294 		goto done;
5295 	}
5296 
5297 	err = block_signals_used_by_main_thread();
5298 	if (err)
5299 		goto done;
5300 
5301 	err = got_blame(ta->path, a->commit_id, ta->repo,
5302 	    tog_diff_algo, blame_cb, ta->cb_args,
5303 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5304 	if (err && err->code == GOT_ERR_CANCELLED)
5305 		err = NULL;
5306 
5307 	errcode = pthread_mutex_lock(&tog_mutex);
5308 	if (errcode) {
5309 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5310 		goto done;
5311 	}
5312 
5313 	close_err = got_repo_close(ta->repo);
5314 	if (err == NULL)
5315 		err = close_err;
5316 	ta->repo = NULL;
5317 	*ta->complete = 1;
5318 
5319 	errcode = pthread_mutex_unlock(&tog_mutex);
5320 	if (errcode && err == NULL)
5321 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5322 
5323 done:
5324 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5325 		err = got_error_from_errno("close");
5326 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5327 		err = got_error_from_errno("close");
5328 	if (f1 && fclose(f1) == EOF && err == NULL)
5329 		err = got_error_from_errno("fclose");
5330 	if (f2 && fclose(f2) == EOF && err == NULL)
5331 		err = got_error_from_errno("fclose");
5332 
5333 	return (void *)err;
5334 }
5335 
5336 static struct got_object_id *
5337 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5338     int first_displayed_line, int selected_line)
5339 {
5340 	struct tog_blame_line *line;
5341 
5342 	if (nlines <= 0)
5343 		return NULL;
5344 
5345 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5346 	if (!line->annotated)
5347 		return NULL;
5348 
5349 	return line->id;
5350 }
5351 
5352 static struct got_object_id *
5353 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5354     int lineno)
5355 {
5356 	struct tog_blame_line *line;
5357 
5358 	if (nlines <= 0 || lineno >= nlines)
5359 		return NULL;
5360 
5361 	line = &lines[lineno - 1];
5362 	if (!line->annotated)
5363 		return NULL;
5364 
5365 	return line->id;
5366 }
5367 
5368 static const struct got_error *
5369 stop_blame(struct tog_blame *blame)
5370 {
5371 	const struct got_error *err = NULL;
5372 	int i;
5373 
5374 	if (blame->thread) {
5375 		int errcode;
5376 		errcode = pthread_mutex_unlock(&tog_mutex);
5377 		if (errcode)
5378 			return got_error_set_errno(errcode,
5379 			    "pthread_mutex_unlock");
5380 		errcode = pthread_join(blame->thread, (void **)&err);
5381 		if (errcode)
5382 			return got_error_set_errno(errcode, "pthread_join");
5383 		errcode = pthread_mutex_lock(&tog_mutex);
5384 		if (errcode)
5385 			return got_error_set_errno(errcode,
5386 			    "pthread_mutex_lock");
5387 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5388 			err = NULL;
5389 		blame->thread = NULL;
5390 	}
5391 	if (blame->thread_args.repo) {
5392 		const struct got_error *close_err;
5393 		close_err = got_repo_close(blame->thread_args.repo);
5394 		if (err == NULL)
5395 			err = close_err;
5396 		blame->thread_args.repo = NULL;
5397 	}
5398 	if (blame->f) {
5399 		if (fclose(blame->f) == EOF && err == NULL)
5400 			err = got_error_from_errno("fclose");
5401 		blame->f = NULL;
5402 	}
5403 	if (blame->lines) {
5404 		for (i = 0; i < blame->nlines; i++)
5405 			free(blame->lines[i].id);
5406 		free(blame->lines);
5407 		blame->lines = NULL;
5408 	}
5409 	free(blame->cb_args.commit_id);
5410 	blame->cb_args.commit_id = NULL;
5411 	if (blame->pack_fds) {
5412 		const struct got_error *pack_err =
5413 		    got_repo_pack_fds_close(blame->pack_fds);
5414 		if (err == NULL)
5415 			err = pack_err;
5416 		blame->pack_fds = NULL;
5417 	}
5418 	return err;
5419 }
5420 
5421 static const struct got_error *
5422 cancel_blame_view(void *arg)
5423 {
5424 	const struct got_error *err = NULL;
5425 	int *done = arg;
5426 	int errcode;
5427 
5428 	errcode = pthread_mutex_lock(&tog_mutex);
5429 	if (errcode)
5430 		return got_error_set_errno(errcode,
5431 		    "pthread_mutex_unlock");
5432 
5433 	if (*done)
5434 		err = got_error(GOT_ERR_CANCELLED);
5435 
5436 	errcode = pthread_mutex_unlock(&tog_mutex);
5437 	if (errcode)
5438 		return got_error_set_errno(errcode,
5439 		    "pthread_mutex_lock");
5440 
5441 	return err;
5442 }
5443 
5444 static const struct got_error *
5445 run_blame(struct tog_view *view)
5446 {
5447 	struct tog_blame_view_state *s = &view->state.blame;
5448 	struct tog_blame *blame = &s->blame;
5449 	const struct got_error *err = NULL;
5450 	struct got_commit_object *commit = NULL;
5451 	struct got_blob_object *blob = NULL;
5452 	struct got_repository *thread_repo = NULL;
5453 	struct got_object_id *obj_id = NULL;
5454 	int obj_type, fd = -1;
5455 	int *pack_fds = NULL;
5456 
5457 	err = got_object_open_as_commit(&commit, s->repo,
5458 	    &s->blamed_commit->id);
5459 	if (err)
5460 		return err;
5461 
5462 	fd = got_opentempfd();
5463 	if (fd == -1) {
5464 		err = got_error_from_errno("got_opentempfd");
5465 		goto done;
5466 	}
5467 
5468 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5469 	if (err)
5470 		goto done;
5471 
5472 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5473 	if (err)
5474 		goto done;
5475 
5476 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5477 		err = got_error(GOT_ERR_OBJ_TYPE);
5478 		goto done;
5479 	}
5480 
5481 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5482 	if (err)
5483 		goto done;
5484 	blame->f = got_opentemp();
5485 	if (blame->f == NULL) {
5486 		err = got_error_from_errno("got_opentemp");
5487 		goto done;
5488 	}
5489 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5490 	    &blame->line_offsets, blame->f, blob);
5491 	if (err)
5492 		goto done;
5493 	if (blame->nlines == 0) {
5494 		s->blame_complete = 1;
5495 		goto done;
5496 	}
5497 
5498 	/* Don't include \n at EOF in the blame line count. */
5499 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5500 		blame->nlines--;
5501 
5502 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5503 	if (blame->lines == NULL) {
5504 		err = got_error_from_errno("calloc");
5505 		goto done;
5506 	}
5507 
5508 	err = got_repo_pack_fds_open(&pack_fds);
5509 	if (err)
5510 		goto done;
5511 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5512 	    pack_fds);
5513 	if (err)
5514 		goto done;
5515 
5516 	blame->pack_fds = pack_fds;
5517 	blame->cb_args.view = view;
5518 	blame->cb_args.lines = blame->lines;
5519 	blame->cb_args.nlines = blame->nlines;
5520 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5521 	if (blame->cb_args.commit_id == NULL) {
5522 		err = got_error_from_errno("got_object_id_dup");
5523 		goto done;
5524 	}
5525 	blame->cb_args.quit = &s->done;
5526 
5527 	blame->thread_args.path = s->path;
5528 	blame->thread_args.repo = thread_repo;
5529 	blame->thread_args.cb_args = &blame->cb_args;
5530 	blame->thread_args.complete = &s->blame_complete;
5531 	blame->thread_args.cancel_cb = cancel_blame_view;
5532 	blame->thread_args.cancel_arg = &s->done;
5533 	s->blame_complete = 0;
5534 
5535 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5536 		s->first_displayed_line = 1;
5537 		s->last_displayed_line = view->nlines;
5538 		s->selected_line = 1;
5539 	}
5540 	s->matched_line = 0;
5541 
5542 done:
5543 	if (commit)
5544 		got_object_commit_close(commit);
5545 	if (fd != -1 && close(fd) == -1 && err == NULL)
5546 		err = got_error_from_errno("close");
5547 	if (blob)
5548 		got_object_blob_close(blob);
5549 	free(obj_id);
5550 	if (err)
5551 		stop_blame(blame);
5552 	return err;
5553 }
5554 
5555 static const struct got_error *
5556 open_blame_view(struct tog_view *view, char *path,
5557     struct got_object_id *commit_id, struct got_repository *repo)
5558 {
5559 	const struct got_error *err = NULL;
5560 	struct tog_blame_view_state *s = &view->state.blame;
5561 
5562 	STAILQ_INIT(&s->blamed_commits);
5563 
5564 	s->path = strdup(path);
5565 	if (s->path == NULL)
5566 		return got_error_from_errno("strdup");
5567 
5568 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5569 	if (err) {
5570 		free(s->path);
5571 		return err;
5572 	}
5573 
5574 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5575 	s->first_displayed_line = 1;
5576 	s->last_displayed_line = view->nlines;
5577 	s->selected_line = 1;
5578 	s->blame_complete = 0;
5579 	s->repo = repo;
5580 	s->commit_id = commit_id;
5581 	memset(&s->blame, 0, sizeof(s->blame));
5582 
5583 	STAILQ_INIT(&s->colors);
5584 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5585 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5586 		    get_color_value("TOG_COLOR_COMMIT"));
5587 		if (err)
5588 			return err;
5589 	}
5590 
5591 	view->show = show_blame_view;
5592 	view->input = input_blame_view;
5593 	view->reset = reset_blame_view;
5594 	view->close = close_blame_view;
5595 	view->search_start = search_start_blame_view;
5596 	view->search_next = search_next_blame_view;
5597 
5598 	return run_blame(view);
5599 }
5600 
5601 static const struct got_error *
5602 close_blame_view(struct tog_view *view)
5603 {
5604 	const struct got_error *err = NULL;
5605 	struct tog_blame_view_state *s = &view->state.blame;
5606 
5607 	if (s->blame.thread)
5608 		err = stop_blame(&s->blame);
5609 
5610 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5611 		struct got_object_qid *blamed_commit;
5612 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5613 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5614 		got_object_qid_free(blamed_commit);
5615 	}
5616 
5617 	free(s->path);
5618 	free_colors(&s->colors);
5619 	return err;
5620 }
5621 
5622 static const struct got_error *
5623 search_start_blame_view(struct tog_view *view)
5624 {
5625 	struct tog_blame_view_state *s = &view->state.blame;
5626 
5627 	s->matched_line = 0;
5628 	return NULL;
5629 }
5630 
5631 static const struct got_error *
5632 search_next_blame_view(struct tog_view *view)
5633 {
5634 	struct tog_blame_view_state *s = &view->state.blame;
5635 	const struct got_error *err = NULL;
5636 	int lineno;
5637 	char *line = NULL;
5638 	size_t linesize = 0;
5639 	ssize_t linelen;
5640 
5641 	if (!view->searching) {
5642 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5643 		return NULL;
5644 	}
5645 
5646 	if (s->matched_line) {
5647 		if (view->searching == TOG_SEARCH_FORWARD)
5648 			lineno = s->matched_line + 1;
5649 		else
5650 			lineno = s->matched_line - 1;
5651 	} else
5652 		lineno = s->first_displayed_line - 1 + s->selected_line;
5653 
5654 	while (1) {
5655 		off_t offset;
5656 
5657 		if (lineno <= 0 || lineno > s->blame.nlines) {
5658 			if (s->matched_line == 0) {
5659 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5660 				break;
5661 			}
5662 
5663 			if (view->searching == TOG_SEARCH_FORWARD)
5664 				lineno = 1;
5665 			else
5666 				lineno = s->blame.nlines;
5667 		}
5668 
5669 		offset = s->blame.line_offsets[lineno - 1];
5670 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5671 			free(line);
5672 			return got_error_from_errno("fseeko");
5673 		}
5674 		linelen = getline(&line, &linesize, s->blame.f);
5675 		if (linelen != -1) {
5676 			char *exstr;
5677 			err = expand_tab(&exstr, line);
5678 			if (err)
5679 				break;
5680 			if (match_line(exstr, &view->regex, 1,
5681 			    &view->regmatch)) {
5682 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5683 				s->matched_line = lineno;
5684 				free(exstr);
5685 				break;
5686 			}
5687 			free(exstr);
5688 		}
5689 		if (view->searching == TOG_SEARCH_FORWARD)
5690 			lineno++;
5691 		else
5692 			lineno--;
5693 	}
5694 	free(line);
5695 
5696 	if (s->matched_line) {
5697 		s->first_displayed_line = s->matched_line;
5698 		s->selected_line = 1;
5699 	}
5700 
5701 	return err;
5702 }
5703 
5704 static const struct got_error *
5705 show_blame_view(struct tog_view *view)
5706 {
5707 	const struct got_error *err = NULL;
5708 	struct tog_blame_view_state *s = &view->state.blame;
5709 	int errcode;
5710 
5711 	if (s->blame.thread == NULL && !s->blame_complete) {
5712 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5713 		    &s->blame.thread_args);
5714 		if (errcode)
5715 			return got_error_set_errno(errcode, "pthread_create");
5716 
5717 		halfdelay(1); /* fast refresh while annotating  */
5718 	}
5719 
5720 	if (s->blame_complete)
5721 		halfdelay(10); /* disable fast refresh */
5722 
5723 	err = draw_blame(view);
5724 
5725 	view_border(view);
5726 	return err;
5727 }
5728 
5729 static const struct got_error *
5730 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5731     struct got_repository *repo, struct got_object_id *id)
5732 {
5733 	struct tog_view		*log_view;
5734 	const struct got_error	*err = NULL;
5735 
5736 	*new_view = NULL;
5737 
5738 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5739 	if (log_view == NULL)
5740 		return got_error_from_errno("view_open");
5741 
5742 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5743 	if (err)
5744 		view_close(log_view);
5745 	else
5746 		*new_view = log_view;
5747 
5748 	return err;
5749 }
5750 
5751 static const struct got_error *
5752 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5753 {
5754 	const struct got_error *err = NULL, *thread_err = NULL;
5755 	struct tog_view *diff_view, *log_view;
5756 	struct tog_blame_view_state *s = &view->state.blame;
5757 	int eos, nscroll, begin_y = 0, begin_x = 0;
5758 
5759 	eos = nscroll = view->nlines - 2;
5760 	if (view_is_hsplit_top(view))
5761 		--eos;  /* border */
5762 
5763 	switch (ch) {
5764 	case '0':
5765 		view->x = 0;
5766 		break;
5767 	case '$':
5768 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5769 		view->count = 0;
5770 		break;
5771 	case KEY_RIGHT:
5772 	case 'l':
5773 		if (view->x + view->ncols / 3 < view->maxx)
5774 			view->x += 2;  /* move two columns right */
5775 		else
5776 			view->count = 0;
5777 		break;
5778 	case KEY_LEFT:
5779 	case 'h':
5780 		view->x -= MIN(view->x, 2);  /* move two columns back */
5781 		if (view->x <= 0)
5782 			view->count = 0;
5783 		break;
5784 	case 'q':
5785 		s->done = 1;
5786 		break;
5787 	case 'g':
5788 	case KEY_HOME:
5789 		s->selected_line = 1;
5790 		s->first_displayed_line = 1;
5791 		view->count = 0;
5792 		break;
5793 	case 'G':
5794 	case KEY_END:
5795 		if (s->blame.nlines < eos) {
5796 			s->selected_line = s->blame.nlines;
5797 			s->first_displayed_line = 1;
5798 		} else {
5799 			s->selected_line = eos;
5800 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5801 		}
5802 		view->count = 0;
5803 		break;
5804 	case 'k':
5805 	case KEY_UP:
5806 	case CTRL('p'):
5807 		if (s->selected_line > 1)
5808 			s->selected_line--;
5809 		else if (s->selected_line == 1 &&
5810 		    s->first_displayed_line > 1)
5811 			s->first_displayed_line--;
5812 		else
5813 			view->count = 0;
5814 		break;
5815 	case CTRL('u'):
5816 	case 'u':
5817 		nscroll /= 2;
5818 		/* FALL THROUGH */
5819 	case KEY_PPAGE:
5820 	case CTRL('b'):
5821 	case 'b':
5822 		if (s->first_displayed_line == 1) {
5823 			if (view->count > 1)
5824 				nscroll += nscroll;
5825 			s->selected_line = MAX(1, s->selected_line - nscroll);
5826 			view->count = 0;
5827 			break;
5828 		}
5829 		if (s->first_displayed_line > nscroll)
5830 			s->first_displayed_line -= nscroll;
5831 		else
5832 			s->first_displayed_line = 1;
5833 		break;
5834 	case 'j':
5835 	case KEY_DOWN:
5836 	case CTRL('n'):
5837 		if (s->selected_line < eos && s->first_displayed_line +
5838 		    s->selected_line <= s->blame.nlines)
5839 			s->selected_line++;
5840 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5841 			s->first_displayed_line++;
5842 		else
5843 			view->count = 0;
5844 		break;
5845 	case 'c':
5846 	case 'p': {
5847 		struct got_object_id *id = NULL;
5848 
5849 		view->count = 0;
5850 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5851 		    s->first_displayed_line, s->selected_line);
5852 		if (id == NULL)
5853 			break;
5854 		if (ch == 'p') {
5855 			struct got_commit_object *commit, *pcommit;
5856 			struct got_object_qid *pid;
5857 			struct got_object_id *blob_id = NULL;
5858 			int obj_type;
5859 			err = got_object_open_as_commit(&commit,
5860 			    s->repo, id);
5861 			if (err)
5862 				break;
5863 			pid = STAILQ_FIRST(
5864 			    got_object_commit_get_parent_ids(commit));
5865 			if (pid == NULL) {
5866 				got_object_commit_close(commit);
5867 				break;
5868 			}
5869 			/* Check if path history ends here. */
5870 			err = got_object_open_as_commit(&pcommit,
5871 			    s->repo, &pid->id);
5872 			if (err)
5873 				break;
5874 			err = got_object_id_by_path(&blob_id, s->repo,
5875 			    pcommit, s->path);
5876 			got_object_commit_close(pcommit);
5877 			if (err) {
5878 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5879 					err = NULL;
5880 				got_object_commit_close(commit);
5881 				break;
5882 			}
5883 			err = got_object_get_type(&obj_type, s->repo,
5884 			    blob_id);
5885 			free(blob_id);
5886 			/* Can't blame non-blob type objects. */
5887 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5888 				got_object_commit_close(commit);
5889 				break;
5890 			}
5891 			err = got_object_qid_alloc(&s->blamed_commit,
5892 			    &pid->id);
5893 			got_object_commit_close(commit);
5894 		} else {
5895 			if (got_object_id_cmp(id,
5896 			    &s->blamed_commit->id) == 0)
5897 				break;
5898 			err = got_object_qid_alloc(&s->blamed_commit,
5899 			    id);
5900 		}
5901 		if (err)
5902 			break;
5903 		s->done = 1;
5904 		thread_err = stop_blame(&s->blame);
5905 		s->done = 0;
5906 		if (thread_err)
5907 			break;
5908 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5909 		    s->blamed_commit, entry);
5910 		err = run_blame(view);
5911 		if (err)
5912 			break;
5913 		break;
5914 	}
5915 	case 'C': {
5916 		struct got_object_qid *first;
5917 
5918 		view->count = 0;
5919 		first = STAILQ_FIRST(&s->blamed_commits);
5920 		if (!got_object_id_cmp(&first->id, s->commit_id))
5921 			break;
5922 		s->done = 1;
5923 		thread_err = stop_blame(&s->blame);
5924 		s->done = 0;
5925 		if (thread_err)
5926 			break;
5927 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5928 		got_object_qid_free(s->blamed_commit);
5929 		s->blamed_commit =
5930 		    STAILQ_FIRST(&s->blamed_commits);
5931 		err = run_blame(view);
5932 		if (err)
5933 			break;
5934 		break;
5935 	}
5936 	case 'L': {
5937 		struct got_object_id *id = NULL;
5938 
5939 		view->count = 0;
5940 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5941 		    s->first_displayed_line, s->selected_line);
5942 		if (id == NULL)
5943 			break;
5944 
5945 		if (view_is_parent_view(view))
5946 			view_get_split(view, &begin_y, &begin_x);
5947 		err = log_annotated_line(&log_view, begin_y, begin_x,
5948 		    s->repo, id);
5949 		if (err)
5950 			break;
5951 		if (view_is_parent_view(view) &&
5952 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
5953 			err = view_init_hsplit(view, begin_y);
5954 			if (err)
5955 				break;
5956 		}
5957 
5958 		view->focussed = 0;
5959 		log_view->focussed = 1;
5960 		log_view->mode = view->mode;
5961 		log_view->nlines = view->lines - begin_y;
5962 		if (view_is_parent_view(view)) {
5963 			view_transfer_size(log_view, view);
5964 			err = view_close_child(view);
5965 			if (err)
5966 				return err;
5967 			err = view_set_child(view, log_view);
5968 			if (err)
5969 				return err;
5970 			view->focus_child = 1;
5971 		} else
5972 			*new_view = log_view;
5973 		break;
5974 	}
5975 	case KEY_ENTER:
5976 	case '\r': {
5977 		struct got_object_id *id = NULL;
5978 		struct got_object_qid *pid;
5979 		struct got_commit_object *commit = NULL;
5980 
5981 		view->count = 0;
5982 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5983 		    s->first_displayed_line, s->selected_line);
5984 		if (id == NULL)
5985 			break;
5986 		err = got_object_open_as_commit(&commit, s->repo, id);
5987 		if (err)
5988 			break;
5989 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5990 		if (*new_view) {
5991 			/* traversed from diff view, release diff resources  */
5992 			err = close_diff_view(*new_view);
5993 			if (err)
5994 				break;
5995 			diff_view = *new_view;
5996 		} else {
5997 			if (view_is_parent_view(view))
5998 				view_get_split(view, &begin_y, &begin_x);
5999 
6000 			diff_view = view_open(0, 0, begin_y, begin_x,
6001 			    TOG_VIEW_DIFF);
6002 			if (diff_view == NULL) {
6003 				got_object_commit_close(commit);
6004 				err = got_error_from_errno("view_open");
6005 				break;
6006 			}
6007 		}
6008 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6009 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6010 		got_object_commit_close(commit);
6011 		if (err) {
6012 			view_close(diff_view);
6013 			break;
6014 		}
6015 		s->last_diffed_line = s->first_displayed_line - 1 +
6016 		    s->selected_line;
6017 		if (*new_view)
6018 			break;	/* still open from active diff view */
6019 		if (view_is_parent_view(view) &&
6020 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6021 			err = view_init_hsplit(view, begin_y);
6022 			if (err)
6023 				break;
6024 		}
6025 
6026 		view->focussed = 0;
6027 		diff_view->focussed = 1;
6028 		diff_view->mode = view->mode;
6029 		diff_view->nlines = view->lines - begin_y;
6030 		if (view_is_parent_view(view)) {
6031 			view_transfer_size(diff_view, view);
6032 			err = view_close_child(view);
6033 			if (err)
6034 				break;
6035 			err = view_set_child(view, diff_view);
6036 			if (err)
6037 				break;
6038 			view->focus_child = 1;
6039 		} else
6040 			*new_view = diff_view;
6041 		if (err)
6042 			break;
6043 		break;
6044 	}
6045 	case CTRL('d'):
6046 	case 'd':
6047 		nscroll /= 2;
6048 		/* FALL THROUGH */
6049 	case KEY_NPAGE:
6050 	case CTRL('f'):
6051 	case 'f':
6052 	case ' ':
6053 		if (s->last_displayed_line >= s->blame.nlines &&
6054 		    s->selected_line >= MIN(s->blame.nlines,
6055 		    view->nlines - 2)) {
6056 			view->count = 0;
6057 			break;
6058 		}
6059 		if (s->last_displayed_line >= s->blame.nlines &&
6060 		    s->selected_line < view->nlines - 2) {
6061 			s->selected_line +=
6062 			    MIN(nscroll, s->last_displayed_line -
6063 			    s->first_displayed_line - s->selected_line + 1);
6064 		}
6065 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6066 			s->first_displayed_line += nscroll;
6067 		else
6068 			s->first_displayed_line =
6069 			    s->blame.nlines - (view->nlines - 3);
6070 		break;
6071 	case KEY_RESIZE:
6072 		if (s->selected_line > view->nlines - 2) {
6073 			s->selected_line = MIN(s->blame.nlines,
6074 			    view->nlines - 2);
6075 		}
6076 		break;
6077 	default:
6078 		view->count = 0;
6079 		break;
6080 	}
6081 	return thread_err ? thread_err : err;
6082 }
6083 
6084 static const struct got_error *
6085 reset_blame_view(struct tog_view *view)
6086 {
6087 	const struct got_error *err;
6088 	struct tog_blame_view_state *s = &view->state.blame;
6089 
6090 	view->count = 0;
6091 	s->done = 1;
6092 	err = stop_blame(&s->blame);
6093 	s->done = 0;
6094 	if (err)
6095 		return err;
6096 	return run_blame(view);
6097 }
6098 
6099 static const struct got_error *
6100 cmd_blame(int argc, char *argv[])
6101 {
6102 	const struct got_error *error;
6103 	struct got_repository *repo = NULL;
6104 	struct got_worktree *worktree = NULL;
6105 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6106 	char *link_target = NULL;
6107 	struct got_object_id *commit_id = NULL;
6108 	struct got_commit_object *commit = NULL;
6109 	char *commit_id_str = NULL;
6110 	int ch;
6111 	struct tog_view *view;
6112 	int *pack_fds = NULL;
6113 
6114 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6115 		switch (ch) {
6116 		case 'c':
6117 			commit_id_str = optarg;
6118 			break;
6119 		case 'r':
6120 			repo_path = realpath(optarg, NULL);
6121 			if (repo_path == NULL)
6122 				return got_error_from_errno2("realpath",
6123 				    optarg);
6124 			break;
6125 		default:
6126 			usage_blame();
6127 			/* NOTREACHED */
6128 		}
6129 	}
6130 
6131 	argc -= optind;
6132 	argv += optind;
6133 
6134 	if (argc != 1)
6135 		usage_blame();
6136 
6137 	error = got_repo_pack_fds_open(&pack_fds);
6138 	if (error != NULL)
6139 		goto done;
6140 
6141 	if (repo_path == NULL) {
6142 		cwd = getcwd(NULL, 0);
6143 		if (cwd == NULL)
6144 			return got_error_from_errno("getcwd");
6145 		error = got_worktree_open(&worktree, cwd);
6146 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6147 			goto done;
6148 		if (worktree)
6149 			repo_path =
6150 			    strdup(got_worktree_get_repo_path(worktree));
6151 		else
6152 			repo_path = strdup(cwd);
6153 		if (repo_path == NULL) {
6154 			error = got_error_from_errno("strdup");
6155 			goto done;
6156 		}
6157 	}
6158 
6159 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6160 	if (error != NULL)
6161 		goto done;
6162 
6163 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6164 	    worktree);
6165 	if (error)
6166 		goto done;
6167 
6168 	init_curses();
6169 
6170 	error = apply_unveil(got_repo_get_path(repo), NULL);
6171 	if (error)
6172 		goto done;
6173 
6174 	error = tog_load_refs(repo, 0);
6175 	if (error)
6176 		goto done;
6177 
6178 	if (commit_id_str == NULL) {
6179 		struct got_reference *head_ref;
6180 		error = got_ref_open(&head_ref, repo, worktree ?
6181 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6182 		if (error != NULL)
6183 			goto done;
6184 		error = got_ref_resolve(&commit_id, repo, head_ref);
6185 		got_ref_close(head_ref);
6186 	} else {
6187 		error = got_repo_match_object_id(&commit_id, NULL,
6188 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6189 	}
6190 	if (error != NULL)
6191 		goto done;
6192 
6193 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6194 	if (view == NULL) {
6195 		error = got_error_from_errno("view_open");
6196 		goto done;
6197 	}
6198 
6199 	error = got_object_open_as_commit(&commit, repo, commit_id);
6200 	if (error)
6201 		goto done;
6202 
6203 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6204 	    commit, repo);
6205 	if (error)
6206 		goto done;
6207 
6208 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6209 	    commit_id, repo);
6210 	if (error)
6211 		goto done;
6212 	if (worktree) {
6213 		/* Release work tree lock. */
6214 		got_worktree_close(worktree);
6215 		worktree = NULL;
6216 	}
6217 	error = view_loop(view);
6218 done:
6219 	free(repo_path);
6220 	free(in_repo_path);
6221 	free(link_target);
6222 	free(cwd);
6223 	free(commit_id);
6224 	if (commit)
6225 		got_object_commit_close(commit);
6226 	if (worktree)
6227 		got_worktree_close(worktree);
6228 	if (repo) {
6229 		const struct got_error *close_err = got_repo_close(repo);
6230 		if (error == NULL)
6231 			error = close_err;
6232 	}
6233 	if (pack_fds) {
6234 		const struct got_error *pack_err =
6235 		    got_repo_pack_fds_close(pack_fds);
6236 		if (error == NULL)
6237 			error = pack_err;
6238 	}
6239 	tog_free_refs();
6240 	return error;
6241 }
6242 
6243 static const struct got_error *
6244 draw_tree_entries(struct tog_view *view, const char *parent_path)
6245 {
6246 	struct tog_tree_view_state *s = &view->state.tree;
6247 	const struct got_error *err = NULL;
6248 	struct got_tree_entry *te;
6249 	wchar_t *wline;
6250 	struct tog_color *tc;
6251 	int width, n, i, nentries;
6252 	int limit = view->nlines;
6253 
6254 	s->ndisplayed = 0;
6255 	if (view_is_hsplit_top(view))
6256 		--limit;  /* border */
6257 
6258 	werase(view->window);
6259 
6260 	if (limit == 0)
6261 		return NULL;
6262 
6263 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6264 	    0, 0);
6265 	if (err)
6266 		return err;
6267 	if (view_needs_focus_indication(view))
6268 		wstandout(view->window);
6269 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6270 	if (tc)
6271 		wattr_on(view->window,
6272 		    COLOR_PAIR(tc->colorpair), NULL);
6273 	waddwstr(view->window, wline);
6274 	if (tc)
6275 		wattr_off(view->window,
6276 		    COLOR_PAIR(tc->colorpair), NULL);
6277 	if (view_needs_focus_indication(view))
6278 		wstandend(view->window);
6279 	free(wline);
6280 	wline = NULL;
6281 	if (width < view->ncols - 1)
6282 		waddch(view->window, '\n');
6283 	if (--limit <= 0)
6284 		return NULL;
6285 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
6286 	    0, 0);
6287 	if (err)
6288 		return err;
6289 	waddwstr(view->window, wline);
6290 	free(wline);
6291 	wline = NULL;
6292 	if (width < view->ncols - 1)
6293 		waddch(view->window, '\n');
6294 	if (--limit <= 0)
6295 		return NULL;
6296 	waddch(view->window, '\n');
6297 	if (--limit <= 0)
6298 		return NULL;
6299 
6300 	if (s->first_displayed_entry == NULL) {
6301 		te = got_object_tree_get_first_entry(s->tree);
6302 		if (s->selected == 0) {
6303 			if (view->focussed)
6304 				wstandout(view->window);
6305 			s->selected_entry = NULL;
6306 		}
6307 		waddstr(view->window, "  ..\n");	/* parent directory */
6308 		if (s->selected == 0 && view->focussed)
6309 			wstandend(view->window);
6310 		s->ndisplayed++;
6311 		if (--limit <= 0)
6312 			return NULL;
6313 		n = 1;
6314 	} else {
6315 		n = 0;
6316 		te = s->first_displayed_entry;
6317 	}
6318 
6319 	nentries = got_object_tree_get_nentries(s->tree);
6320 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6321 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6322 		const char *modestr = "";
6323 		mode_t mode;
6324 
6325 		te = got_object_tree_get_entry(s->tree, i);
6326 		mode = got_tree_entry_get_mode(te);
6327 
6328 		if (s->show_ids) {
6329 			err = got_object_id_str(&id_str,
6330 			    got_tree_entry_get_id(te));
6331 			if (err)
6332 				return got_error_from_errno(
6333 				    "got_object_id_str");
6334 		}
6335 		if (got_object_tree_entry_is_submodule(te))
6336 			modestr = "$";
6337 		else if (S_ISLNK(mode)) {
6338 			int i;
6339 
6340 			err = got_tree_entry_get_symlink_target(&link_target,
6341 			    te, s->repo);
6342 			if (err) {
6343 				free(id_str);
6344 				return err;
6345 			}
6346 			for (i = 0; i < strlen(link_target); i++) {
6347 				if (!isprint((unsigned char)link_target[i]))
6348 					link_target[i] = '?';
6349 			}
6350 			modestr = "@";
6351 		}
6352 		else if (S_ISDIR(mode))
6353 			modestr = "/";
6354 		else if (mode & S_IXUSR)
6355 			modestr = "*";
6356 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6357 		    got_tree_entry_get_name(te), modestr,
6358 		    link_target ? " -> ": "",
6359 		    link_target ? link_target : "") == -1) {
6360 			free(id_str);
6361 			free(link_target);
6362 			return got_error_from_errno("asprintf");
6363 		}
6364 		free(id_str);
6365 		free(link_target);
6366 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6367 		    0, 0);
6368 		if (err) {
6369 			free(line);
6370 			break;
6371 		}
6372 		if (n == s->selected) {
6373 			if (view->focussed)
6374 				wstandout(view->window);
6375 			s->selected_entry = te;
6376 		}
6377 		tc = match_color(&s->colors, line);
6378 		if (tc)
6379 			wattr_on(view->window,
6380 			    COLOR_PAIR(tc->colorpair), NULL);
6381 		waddwstr(view->window, wline);
6382 		if (tc)
6383 			wattr_off(view->window,
6384 			    COLOR_PAIR(tc->colorpair), NULL);
6385 		if (width < view->ncols - 1)
6386 			waddch(view->window, '\n');
6387 		if (n == s->selected && view->focussed)
6388 			wstandend(view->window);
6389 		free(line);
6390 		free(wline);
6391 		wline = NULL;
6392 		n++;
6393 		s->ndisplayed++;
6394 		s->last_displayed_entry = te;
6395 		if (--limit <= 0)
6396 			break;
6397 	}
6398 
6399 	return err;
6400 }
6401 
6402 static void
6403 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6404 {
6405 	struct got_tree_entry *te;
6406 	int isroot = s->tree == s->root;
6407 	int i = 0;
6408 
6409 	if (s->first_displayed_entry == NULL)
6410 		return;
6411 
6412 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6413 	while (i++ < maxscroll) {
6414 		if (te == NULL) {
6415 			if (!isroot)
6416 				s->first_displayed_entry = NULL;
6417 			break;
6418 		}
6419 		s->first_displayed_entry = te;
6420 		te = got_tree_entry_get_prev(s->tree, te);
6421 	}
6422 }
6423 
6424 static const struct got_error *
6425 tree_scroll_down(struct tog_view *view, int maxscroll)
6426 {
6427 	struct tog_tree_view_state *s = &view->state.tree;
6428 	struct got_tree_entry *next, *last;
6429 	int n = 0;
6430 
6431 	if (s->first_displayed_entry)
6432 		next = got_tree_entry_get_next(s->tree,
6433 		    s->first_displayed_entry);
6434 	else
6435 		next = got_object_tree_get_first_entry(s->tree);
6436 
6437 	last = s->last_displayed_entry;
6438 	while (next && n++ < maxscroll) {
6439 		if (last)
6440 			last = got_tree_entry_get_next(s->tree, last);
6441 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6442 			s->first_displayed_entry = next;
6443 			next = got_tree_entry_get_next(s->tree, next);
6444 		}
6445 	}
6446 
6447 	return NULL;
6448 }
6449 
6450 static const struct got_error *
6451 tree_entry_path(char **path, struct tog_parent_trees *parents,
6452     struct got_tree_entry *te)
6453 {
6454 	const struct got_error *err = NULL;
6455 	struct tog_parent_tree *pt;
6456 	size_t len = 2; /* for leading slash and NUL */
6457 
6458 	TAILQ_FOREACH(pt, parents, entry)
6459 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6460 		    + 1 /* slash */;
6461 	if (te)
6462 		len += strlen(got_tree_entry_get_name(te));
6463 
6464 	*path = calloc(1, len);
6465 	if (path == NULL)
6466 		return got_error_from_errno("calloc");
6467 
6468 	(*path)[0] = '/';
6469 	pt = TAILQ_LAST(parents, tog_parent_trees);
6470 	while (pt) {
6471 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6472 		if (strlcat(*path, name, len) >= len) {
6473 			err = got_error(GOT_ERR_NO_SPACE);
6474 			goto done;
6475 		}
6476 		if (strlcat(*path, "/", len) >= len) {
6477 			err = got_error(GOT_ERR_NO_SPACE);
6478 			goto done;
6479 		}
6480 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6481 	}
6482 	if (te) {
6483 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6484 			err = got_error(GOT_ERR_NO_SPACE);
6485 			goto done;
6486 		}
6487 	}
6488 done:
6489 	if (err) {
6490 		free(*path);
6491 		*path = NULL;
6492 	}
6493 	return err;
6494 }
6495 
6496 static const struct got_error *
6497 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6498     struct got_tree_entry *te, struct tog_parent_trees *parents,
6499     struct got_object_id *commit_id, struct got_repository *repo)
6500 {
6501 	const struct got_error *err = NULL;
6502 	char *path;
6503 	struct tog_view *blame_view;
6504 
6505 	*new_view = NULL;
6506 
6507 	err = tree_entry_path(&path, parents, te);
6508 	if (err)
6509 		return err;
6510 
6511 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6512 	if (blame_view == NULL) {
6513 		err = got_error_from_errno("view_open");
6514 		goto done;
6515 	}
6516 
6517 	err = open_blame_view(blame_view, path, commit_id, repo);
6518 	if (err) {
6519 		if (err->code == GOT_ERR_CANCELLED)
6520 			err = NULL;
6521 		view_close(blame_view);
6522 	} else
6523 		*new_view = blame_view;
6524 done:
6525 	free(path);
6526 	return err;
6527 }
6528 
6529 static const struct got_error *
6530 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6531     struct tog_tree_view_state *s)
6532 {
6533 	struct tog_view *log_view;
6534 	const struct got_error *err = NULL;
6535 	char *path;
6536 
6537 	*new_view = NULL;
6538 
6539 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6540 	if (log_view == NULL)
6541 		return got_error_from_errno("view_open");
6542 
6543 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6544 	if (err)
6545 		return err;
6546 
6547 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6548 	    path, 0);
6549 	if (err)
6550 		view_close(log_view);
6551 	else
6552 		*new_view = log_view;
6553 	free(path);
6554 	return err;
6555 }
6556 
6557 static const struct got_error *
6558 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6559     const char *head_ref_name, struct got_repository *repo)
6560 {
6561 	const struct got_error *err = NULL;
6562 	char *commit_id_str = NULL;
6563 	struct tog_tree_view_state *s = &view->state.tree;
6564 	struct got_commit_object *commit = NULL;
6565 
6566 	TAILQ_INIT(&s->parents);
6567 	STAILQ_INIT(&s->colors);
6568 
6569 	s->commit_id = got_object_id_dup(commit_id);
6570 	if (s->commit_id == NULL)
6571 		return got_error_from_errno("got_object_id_dup");
6572 
6573 	err = got_object_open_as_commit(&commit, repo, commit_id);
6574 	if (err)
6575 		goto done;
6576 
6577 	/*
6578 	 * The root is opened here and will be closed when the view is closed.
6579 	 * Any visited subtrees and their path-wise parents are opened and
6580 	 * closed on demand.
6581 	 */
6582 	err = got_object_open_as_tree(&s->root, repo,
6583 	    got_object_commit_get_tree_id(commit));
6584 	if (err)
6585 		goto done;
6586 	s->tree = s->root;
6587 
6588 	err = got_object_id_str(&commit_id_str, commit_id);
6589 	if (err != NULL)
6590 		goto done;
6591 
6592 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6593 		err = got_error_from_errno("asprintf");
6594 		goto done;
6595 	}
6596 
6597 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6598 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6599 	if (head_ref_name) {
6600 		s->head_ref_name = strdup(head_ref_name);
6601 		if (s->head_ref_name == NULL) {
6602 			err = got_error_from_errno("strdup");
6603 			goto done;
6604 		}
6605 	}
6606 	s->repo = repo;
6607 
6608 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6609 		err = add_color(&s->colors, "\\$$",
6610 		    TOG_COLOR_TREE_SUBMODULE,
6611 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6612 		if (err)
6613 			goto done;
6614 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6615 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6616 		if (err)
6617 			goto done;
6618 		err = add_color(&s->colors, "/$",
6619 		    TOG_COLOR_TREE_DIRECTORY,
6620 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6621 		if (err)
6622 			goto done;
6623 
6624 		err = add_color(&s->colors, "\\*$",
6625 		    TOG_COLOR_TREE_EXECUTABLE,
6626 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6627 		if (err)
6628 			goto done;
6629 
6630 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6631 		    get_color_value("TOG_COLOR_COMMIT"));
6632 		if (err)
6633 			goto done;
6634 	}
6635 
6636 	view->show = show_tree_view;
6637 	view->input = input_tree_view;
6638 	view->close = close_tree_view;
6639 	view->search_start = search_start_tree_view;
6640 	view->search_next = search_next_tree_view;
6641 done:
6642 	free(commit_id_str);
6643 	if (commit)
6644 		got_object_commit_close(commit);
6645 	if (err)
6646 		close_tree_view(view);
6647 	return err;
6648 }
6649 
6650 static const struct got_error *
6651 close_tree_view(struct tog_view *view)
6652 {
6653 	struct tog_tree_view_state *s = &view->state.tree;
6654 
6655 	free_colors(&s->colors);
6656 	free(s->tree_label);
6657 	s->tree_label = NULL;
6658 	free(s->commit_id);
6659 	s->commit_id = NULL;
6660 	free(s->head_ref_name);
6661 	s->head_ref_name = NULL;
6662 	while (!TAILQ_EMPTY(&s->parents)) {
6663 		struct tog_parent_tree *parent;
6664 		parent = TAILQ_FIRST(&s->parents);
6665 		TAILQ_REMOVE(&s->parents, parent, entry);
6666 		if (parent->tree != s->root)
6667 			got_object_tree_close(parent->tree);
6668 		free(parent);
6669 
6670 	}
6671 	if (s->tree != NULL && s->tree != s->root)
6672 		got_object_tree_close(s->tree);
6673 	if (s->root)
6674 		got_object_tree_close(s->root);
6675 	return NULL;
6676 }
6677 
6678 static const struct got_error *
6679 search_start_tree_view(struct tog_view *view)
6680 {
6681 	struct tog_tree_view_state *s = &view->state.tree;
6682 
6683 	s->matched_entry = NULL;
6684 	return NULL;
6685 }
6686 
6687 static int
6688 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6689 {
6690 	regmatch_t regmatch;
6691 
6692 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6693 	    0) == 0;
6694 }
6695 
6696 static const struct got_error *
6697 search_next_tree_view(struct tog_view *view)
6698 {
6699 	struct tog_tree_view_state *s = &view->state.tree;
6700 	struct got_tree_entry *te = NULL;
6701 
6702 	if (!view->searching) {
6703 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6704 		return NULL;
6705 	}
6706 
6707 	if (s->matched_entry) {
6708 		if (view->searching == TOG_SEARCH_FORWARD) {
6709 			if (s->selected_entry)
6710 				te = got_tree_entry_get_next(s->tree,
6711 				    s->selected_entry);
6712 			else
6713 				te = got_object_tree_get_first_entry(s->tree);
6714 		} else {
6715 			if (s->selected_entry == NULL)
6716 				te = got_object_tree_get_last_entry(s->tree);
6717 			else
6718 				te = got_tree_entry_get_prev(s->tree,
6719 				    s->selected_entry);
6720 		}
6721 	} else {
6722 		if (s->selected_entry)
6723 			te = s->selected_entry;
6724 		else if (view->searching == TOG_SEARCH_FORWARD)
6725 			te = got_object_tree_get_first_entry(s->tree);
6726 		else
6727 			te = got_object_tree_get_last_entry(s->tree);
6728 	}
6729 
6730 	while (1) {
6731 		if (te == NULL) {
6732 			if (s->matched_entry == NULL) {
6733 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6734 				return NULL;
6735 			}
6736 			if (view->searching == TOG_SEARCH_FORWARD)
6737 				te = got_object_tree_get_first_entry(s->tree);
6738 			else
6739 				te = got_object_tree_get_last_entry(s->tree);
6740 		}
6741 
6742 		if (match_tree_entry(te, &view->regex)) {
6743 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6744 			s->matched_entry = te;
6745 			break;
6746 		}
6747 
6748 		if (view->searching == TOG_SEARCH_FORWARD)
6749 			te = got_tree_entry_get_next(s->tree, te);
6750 		else
6751 			te = got_tree_entry_get_prev(s->tree, te);
6752 	}
6753 
6754 	if (s->matched_entry) {
6755 		s->first_displayed_entry = s->matched_entry;
6756 		s->selected = 0;
6757 	}
6758 
6759 	return NULL;
6760 }
6761 
6762 static const struct got_error *
6763 show_tree_view(struct tog_view *view)
6764 {
6765 	const struct got_error *err = NULL;
6766 	struct tog_tree_view_state *s = &view->state.tree;
6767 	char *parent_path;
6768 
6769 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6770 	if (err)
6771 		return err;
6772 
6773 	err = draw_tree_entries(view, parent_path);
6774 	free(parent_path);
6775 
6776 	view_border(view);
6777 	return err;
6778 }
6779 
6780 static const struct got_error *
6781 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6782 {
6783 	const struct got_error *err = NULL;
6784 	struct tog_tree_view_state *s = &view->state.tree;
6785 	struct tog_view *log_view, *ref_view;
6786 	struct got_tree_entry *te;
6787 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 3;
6788 
6789 	switch (ch) {
6790 	case 'i':
6791 		s->show_ids = !s->show_ids;
6792 		view->count = 0;
6793 		break;
6794 	case 'l':
6795 		view->count = 0;
6796 		if (!s->selected_entry)
6797 			break;
6798 		if (view_is_parent_view(view))
6799 			view_get_split(view, &begin_y, &begin_x);
6800 		err = log_selected_tree_entry(&log_view, begin_y, begin_x, s);
6801 		if (view_is_parent_view(view) &&
6802 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6803 			err = view_init_hsplit(view, begin_y);
6804 			if (err)
6805 				break;
6806 		}
6807 		view->focussed = 0;
6808 		log_view->focussed = 1;
6809 		log_view->mode = view->mode;
6810 		log_view->nlines = view->lines - begin_y;
6811 		if (view_is_parent_view(view)) {
6812 			view_transfer_size(log_view, view);
6813 			err = view_close_child(view);
6814 			if (err)
6815 				return err;
6816 			err = view_set_child(view, log_view);
6817 			if (err)
6818 				return err;
6819 			view->focus_child = 1;
6820 		} else
6821 			*new_view = log_view;
6822 		break;
6823 	case 'r':
6824 		view->count = 0;
6825 		if (view_is_parent_view(view))
6826 			view_get_split(view, &begin_y, &begin_x);
6827 		ref_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_REF);
6828 		if (ref_view == NULL)
6829 			return got_error_from_errno("view_open");
6830 		err = open_ref_view(ref_view, s->repo);
6831 		if (err) {
6832 			view_close(ref_view);
6833 			return err;
6834 		}
6835 		if (view_is_parent_view(view) &&
6836 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6837 			err = view_init_hsplit(view, begin_y);
6838 			if (err)
6839 				break;
6840 		}
6841 		view->focussed = 0;
6842 		ref_view->focussed = 1;
6843 		ref_view->mode = view->mode;
6844 		ref_view->nlines = view->lines - begin_y;
6845 		if (view_is_parent_view(view)) {
6846 			view_transfer_size(ref_view, view);
6847 			err = view_close_child(view);
6848 			if (err)
6849 				return err;
6850 			err = view_set_child(view, ref_view);
6851 			if (err)
6852 				return err;
6853 			view->focus_child = 1;
6854 		} else
6855 			*new_view = ref_view;
6856 		break;
6857 	case 'g':
6858 	case KEY_HOME:
6859 		s->selected = 0;
6860 		view->count = 0;
6861 		if (s->tree == s->root)
6862 			s->first_displayed_entry =
6863 			    got_object_tree_get_first_entry(s->tree);
6864 		else
6865 			s->first_displayed_entry = NULL;
6866 		break;
6867 	case 'G':
6868 	case KEY_END: {
6869 		int eos = view->nlines - 3;
6870 
6871 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6872 			--eos;  /* border */
6873 		s->selected = 0;
6874 		view->count = 0;
6875 		te = got_object_tree_get_last_entry(s->tree);
6876 		for (n = 0; n < eos; n++) {
6877 			if (te == NULL) {
6878 				if (s->tree != s->root) {
6879 					s->first_displayed_entry = NULL;
6880 					n++;
6881 				}
6882 				break;
6883 			}
6884 			s->first_displayed_entry = te;
6885 			te = got_tree_entry_get_prev(s->tree, te);
6886 		}
6887 		if (n > 0)
6888 			s->selected = n - 1;
6889 		break;
6890 	}
6891 	case 'k':
6892 	case KEY_UP:
6893 	case CTRL('p'):
6894 		if (s->selected > 0) {
6895 			s->selected--;
6896 			break;
6897 		}
6898 		tree_scroll_up(s, 1);
6899 		if (s->selected_entry == NULL ||
6900 		    (s->tree == s->root && s->selected_entry ==
6901 		     got_object_tree_get_first_entry(s->tree)))
6902 			view->count = 0;
6903 		break;
6904 	case CTRL('u'):
6905 	case 'u':
6906 		nscroll /= 2;
6907 		/* FALL THROUGH */
6908 	case KEY_PPAGE:
6909 	case CTRL('b'):
6910 	case 'b':
6911 		if (s->tree == s->root) {
6912 			if (got_object_tree_get_first_entry(s->tree) ==
6913 			    s->first_displayed_entry)
6914 				s->selected -= MIN(s->selected, nscroll);
6915 		} else {
6916 			if (s->first_displayed_entry == NULL)
6917 				s->selected -= MIN(s->selected, nscroll);
6918 		}
6919 		tree_scroll_up(s, MAX(0, nscroll));
6920 		if (s->selected_entry == NULL ||
6921 		    (s->tree == s->root && s->selected_entry ==
6922 		     got_object_tree_get_first_entry(s->tree)))
6923 			view->count = 0;
6924 		break;
6925 	case 'j':
6926 	case KEY_DOWN:
6927 	case CTRL('n'):
6928 		if (s->selected < s->ndisplayed - 1) {
6929 			s->selected++;
6930 			break;
6931 		}
6932 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6933 		    == NULL) {
6934 			/* can't scroll any further */
6935 			view->count = 0;
6936 			break;
6937 		}
6938 		tree_scroll_down(view, 1);
6939 		break;
6940 	case CTRL('d'):
6941 	case 'd':
6942 		nscroll /= 2;
6943 		/* FALL THROUGH */
6944 	case KEY_NPAGE:
6945 	case CTRL('f'):
6946 	case 'f':
6947 	case ' ':
6948 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6949 		    == NULL) {
6950 			/* can't scroll any further; move cursor down */
6951 			if (s->selected < s->ndisplayed - 1)
6952 				s->selected += MIN(nscroll,
6953 				    s->ndisplayed - s->selected - 1);
6954 			else
6955 				view->count = 0;
6956 			break;
6957 		}
6958 		tree_scroll_down(view, nscroll);
6959 		break;
6960 	case KEY_ENTER:
6961 	case '\r':
6962 	case KEY_BACKSPACE:
6963 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6964 			struct tog_parent_tree *parent;
6965 			/* user selected '..' */
6966 			if (s->tree == s->root) {
6967 				view->count = 0;
6968 				break;
6969 			}
6970 			parent = TAILQ_FIRST(&s->parents);
6971 			TAILQ_REMOVE(&s->parents, parent,
6972 			    entry);
6973 			got_object_tree_close(s->tree);
6974 			s->tree = parent->tree;
6975 			s->first_displayed_entry =
6976 			    parent->first_displayed_entry;
6977 			s->selected_entry =
6978 			    parent->selected_entry;
6979 			s->selected = parent->selected;
6980 			if (s->selected > view->nlines - 3) {
6981 				err = offset_selection_down(view);
6982 				if (err)
6983 					break;
6984 			}
6985 			free(parent);
6986 		} else if (S_ISDIR(got_tree_entry_get_mode(
6987 		    s->selected_entry))) {
6988 			struct got_tree_object *subtree;
6989 			view->count = 0;
6990 			err = got_object_open_as_tree(&subtree, s->repo,
6991 			    got_tree_entry_get_id(s->selected_entry));
6992 			if (err)
6993 				break;
6994 			err = tree_view_visit_subtree(s, subtree);
6995 			if (err) {
6996 				got_object_tree_close(subtree);
6997 				break;
6998 			}
6999 		} else if (S_ISREG(got_tree_entry_get_mode(
7000 		    s->selected_entry))) {
7001 			struct tog_view *blame_view;
7002 			int begin_x = 0, begin_y = 0;
7003 
7004 			if (view_is_parent_view(view))
7005 				view_get_split(view, &begin_y, &begin_x);
7006 
7007 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
7008 			    s->selected_entry, &s->parents,
7009 			    s->commit_id, s->repo);
7010 			if (err)
7011 				break;
7012 
7013 			if (view_is_parent_view(view) &&
7014 			    view->mode == TOG_VIEW_SPLIT_HRZN) {
7015 				err = view_init_hsplit(view, begin_y);
7016 				if (err)
7017 					break;
7018 			}
7019 
7020 			view->count = 0;
7021 			view->focussed = 0;
7022 			blame_view->focussed = 1;
7023 			blame_view->mode = view->mode;
7024 			blame_view->nlines = view->lines - begin_y;
7025 			if (view_is_parent_view(view)) {
7026 				view_transfer_size(blame_view, view);
7027 				err = view_close_child(view);
7028 				if (err)
7029 					return err;
7030 				err = view_set_child(view, blame_view);
7031 				if (err)
7032 					return err;
7033 				view->focus_child = 1;
7034 			} else
7035 				*new_view = blame_view;
7036 		}
7037 		break;
7038 	case KEY_RESIZE:
7039 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7040 			s->selected = view->nlines - 4;
7041 		view->count = 0;
7042 		break;
7043 	default:
7044 		view->count = 0;
7045 		break;
7046 	}
7047 
7048 	return err;
7049 }
7050 
7051 __dead static void
7052 usage_tree(void)
7053 {
7054 	endwin();
7055 	fprintf(stderr,
7056 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7057 	    getprogname());
7058 	exit(1);
7059 }
7060 
7061 static const struct got_error *
7062 cmd_tree(int argc, char *argv[])
7063 {
7064 	const struct got_error *error;
7065 	struct got_repository *repo = NULL;
7066 	struct got_worktree *worktree = NULL;
7067 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7068 	struct got_object_id *commit_id = NULL;
7069 	struct got_commit_object *commit = NULL;
7070 	const char *commit_id_arg = NULL;
7071 	char *label = NULL;
7072 	struct got_reference *ref = NULL;
7073 	const char *head_ref_name = NULL;
7074 	int ch;
7075 	struct tog_view *view;
7076 	int *pack_fds = NULL;
7077 
7078 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7079 		switch (ch) {
7080 		case 'c':
7081 			commit_id_arg = optarg;
7082 			break;
7083 		case 'r':
7084 			repo_path = realpath(optarg, NULL);
7085 			if (repo_path == NULL)
7086 				return got_error_from_errno2("realpath",
7087 				    optarg);
7088 			break;
7089 		default:
7090 			usage_tree();
7091 			/* NOTREACHED */
7092 		}
7093 	}
7094 
7095 	argc -= optind;
7096 	argv += optind;
7097 
7098 	if (argc > 1)
7099 		usage_tree();
7100 
7101 	error = got_repo_pack_fds_open(&pack_fds);
7102 	if (error != NULL)
7103 		goto done;
7104 
7105 	if (repo_path == NULL) {
7106 		cwd = getcwd(NULL, 0);
7107 		if (cwd == NULL)
7108 			return got_error_from_errno("getcwd");
7109 		error = got_worktree_open(&worktree, cwd);
7110 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7111 			goto done;
7112 		if (worktree)
7113 			repo_path =
7114 			    strdup(got_worktree_get_repo_path(worktree));
7115 		else
7116 			repo_path = strdup(cwd);
7117 		if (repo_path == NULL) {
7118 			error = got_error_from_errno("strdup");
7119 			goto done;
7120 		}
7121 	}
7122 
7123 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7124 	if (error != NULL)
7125 		goto done;
7126 
7127 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7128 	    repo, worktree);
7129 	if (error)
7130 		goto done;
7131 
7132 	init_curses();
7133 
7134 	error = apply_unveil(got_repo_get_path(repo), NULL);
7135 	if (error)
7136 		goto done;
7137 
7138 	error = tog_load_refs(repo, 0);
7139 	if (error)
7140 		goto done;
7141 
7142 	if (commit_id_arg == NULL) {
7143 		error = got_repo_match_object_id(&commit_id, &label,
7144 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7145 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7146 		if (error)
7147 			goto done;
7148 		head_ref_name = label;
7149 	} else {
7150 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7151 		if (error == NULL)
7152 			head_ref_name = got_ref_get_name(ref);
7153 		else if (error->code != GOT_ERR_NOT_REF)
7154 			goto done;
7155 		error = got_repo_match_object_id(&commit_id, NULL,
7156 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7157 		if (error)
7158 			goto done;
7159 	}
7160 
7161 	error = got_object_open_as_commit(&commit, repo, commit_id);
7162 	if (error)
7163 		goto done;
7164 
7165 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7166 	if (view == NULL) {
7167 		error = got_error_from_errno("view_open");
7168 		goto done;
7169 	}
7170 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7171 	if (error)
7172 		goto done;
7173 	if (!got_path_is_root_dir(in_repo_path)) {
7174 		error = tree_view_walk_path(&view->state.tree, commit,
7175 		    in_repo_path);
7176 		if (error)
7177 			goto done;
7178 	}
7179 
7180 	if (worktree) {
7181 		/* Release work tree lock. */
7182 		got_worktree_close(worktree);
7183 		worktree = NULL;
7184 	}
7185 	error = view_loop(view);
7186 done:
7187 	free(repo_path);
7188 	free(cwd);
7189 	free(commit_id);
7190 	free(label);
7191 	if (ref)
7192 		got_ref_close(ref);
7193 	if (repo) {
7194 		const struct got_error *close_err = got_repo_close(repo);
7195 		if (error == NULL)
7196 			error = close_err;
7197 	}
7198 	if (pack_fds) {
7199 		const struct got_error *pack_err =
7200 		    got_repo_pack_fds_close(pack_fds);
7201 		if (error == NULL)
7202 			error = pack_err;
7203 	}
7204 	tog_free_refs();
7205 	return error;
7206 }
7207 
7208 static const struct got_error *
7209 ref_view_load_refs(struct tog_ref_view_state *s)
7210 {
7211 	struct got_reflist_entry *sre;
7212 	struct tog_reflist_entry *re;
7213 
7214 	s->nrefs = 0;
7215 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7216 		if (strncmp(got_ref_get_name(sre->ref),
7217 		    "refs/got/", 9) == 0 &&
7218 		    strncmp(got_ref_get_name(sre->ref),
7219 		    "refs/got/backup/", 16) != 0)
7220 			continue;
7221 
7222 		re = malloc(sizeof(*re));
7223 		if (re == NULL)
7224 			return got_error_from_errno("malloc");
7225 
7226 		re->ref = got_ref_dup(sre->ref);
7227 		if (re->ref == NULL)
7228 			return got_error_from_errno("got_ref_dup");
7229 		re->idx = s->nrefs++;
7230 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7231 	}
7232 
7233 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7234 	return NULL;
7235 }
7236 
7237 static void
7238 ref_view_free_refs(struct tog_ref_view_state *s)
7239 {
7240 	struct tog_reflist_entry *re;
7241 
7242 	while (!TAILQ_EMPTY(&s->refs)) {
7243 		re = TAILQ_FIRST(&s->refs);
7244 		TAILQ_REMOVE(&s->refs, re, entry);
7245 		got_ref_close(re->ref);
7246 		free(re);
7247 	}
7248 }
7249 
7250 static const struct got_error *
7251 open_ref_view(struct tog_view *view, struct got_repository *repo)
7252 {
7253 	const struct got_error *err = NULL;
7254 	struct tog_ref_view_state *s = &view->state.ref;
7255 
7256 	s->selected_entry = 0;
7257 	s->repo = repo;
7258 
7259 	TAILQ_INIT(&s->refs);
7260 	STAILQ_INIT(&s->colors);
7261 
7262 	err = ref_view_load_refs(s);
7263 	if (err)
7264 		return err;
7265 
7266 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7267 		err = add_color(&s->colors, "^refs/heads/",
7268 		    TOG_COLOR_REFS_HEADS,
7269 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7270 		if (err)
7271 			goto done;
7272 
7273 		err = add_color(&s->colors, "^refs/tags/",
7274 		    TOG_COLOR_REFS_TAGS,
7275 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7276 		if (err)
7277 			goto done;
7278 
7279 		err = add_color(&s->colors, "^refs/remotes/",
7280 		    TOG_COLOR_REFS_REMOTES,
7281 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7282 		if (err)
7283 			goto done;
7284 
7285 		err = add_color(&s->colors, "^refs/got/backup/",
7286 		    TOG_COLOR_REFS_BACKUP,
7287 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7288 		if (err)
7289 			goto done;
7290 	}
7291 
7292 	view->show = show_ref_view;
7293 	view->input = input_ref_view;
7294 	view->close = close_ref_view;
7295 	view->search_start = search_start_ref_view;
7296 	view->search_next = search_next_ref_view;
7297 done:
7298 	if (err)
7299 		free_colors(&s->colors);
7300 	return err;
7301 }
7302 
7303 static const struct got_error *
7304 close_ref_view(struct tog_view *view)
7305 {
7306 	struct tog_ref_view_state *s = &view->state.ref;
7307 
7308 	ref_view_free_refs(s);
7309 	free_colors(&s->colors);
7310 
7311 	return NULL;
7312 }
7313 
7314 static const struct got_error *
7315 resolve_reflist_entry(struct got_object_id **commit_id,
7316     struct tog_reflist_entry *re, struct got_repository *repo)
7317 {
7318 	const struct got_error *err = NULL;
7319 	struct got_object_id *obj_id;
7320 	struct got_tag_object *tag = NULL;
7321 	int obj_type;
7322 
7323 	*commit_id = NULL;
7324 
7325 	err = got_ref_resolve(&obj_id, repo, re->ref);
7326 	if (err)
7327 		return err;
7328 
7329 	err = got_object_get_type(&obj_type, repo, obj_id);
7330 	if (err)
7331 		goto done;
7332 
7333 	switch (obj_type) {
7334 	case GOT_OBJ_TYPE_COMMIT:
7335 		*commit_id = obj_id;
7336 		break;
7337 	case GOT_OBJ_TYPE_TAG:
7338 		err = got_object_open_as_tag(&tag, repo, obj_id);
7339 		if (err)
7340 			goto done;
7341 		free(obj_id);
7342 		err = got_object_get_type(&obj_type, repo,
7343 		    got_object_tag_get_object_id(tag));
7344 		if (err)
7345 			goto done;
7346 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7347 			err = got_error(GOT_ERR_OBJ_TYPE);
7348 			goto done;
7349 		}
7350 		*commit_id = got_object_id_dup(
7351 		    got_object_tag_get_object_id(tag));
7352 		if (*commit_id == NULL) {
7353 			err = got_error_from_errno("got_object_id_dup");
7354 			goto done;
7355 		}
7356 		break;
7357 	default:
7358 		err = got_error(GOT_ERR_OBJ_TYPE);
7359 		break;
7360 	}
7361 
7362 done:
7363 	if (tag)
7364 		got_object_tag_close(tag);
7365 	if (err) {
7366 		free(*commit_id);
7367 		*commit_id = NULL;
7368 	}
7369 	return err;
7370 }
7371 
7372 static const struct got_error *
7373 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7374     struct tog_reflist_entry *re, struct got_repository *repo)
7375 {
7376 	struct tog_view *log_view;
7377 	const struct got_error *err = NULL;
7378 	struct got_object_id *commit_id = NULL;
7379 
7380 	*new_view = NULL;
7381 
7382 	err = resolve_reflist_entry(&commit_id, re, repo);
7383 	if (err) {
7384 		if (err->code != GOT_ERR_OBJ_TYPE)
7385 			return err;
7386 		else
7387 			return NULL;
7388 	}
7389 
7390 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7391 	if (log_view == NULL) {
7392 		err = got_error_from_errno("view_open");
7393 		goto done;
7394 	}
7395 
7396 	err = open_log_view(log_view, commit_id, repo,
7397 	    got_ref_get_name(re->ref), "", 0);
7398 done:
7399 	if (err)
7400 		view_close(log_view);
7401 	else
7402 		*new_view = log_view;
7403 	free(commit_id);
7404 	return err;
7405 }
7406 
7407 static void
7408 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7409 {
7410 	struct tog_reflist_entry *re;
7411 	int i = 0;
7412 
7413 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7414 		return;
7415 
7416 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7417 	while (i++ < maxscroll) {
7418 		if (re == NULL)
7419 			break;
7420 		s->first_displayed_entry = re;
7421 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7422 	}
7423 }
7424 
7425 static const struct got_error *
7426 ref_scroll_down(struct tog_view *view, int maxscroll)
7427 {
7428 	struct tog_ref_view_state *s = &view->state.ref;
7429 	struct tog_reflist_entry *next, *last;
7430 	int n = 0;
7431 
7432 	if (s->first_displayed_entry)
7433 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7434 	else
7435 		next = TAILQ_FIRST(&s->refs);
7436 
7437 	last = s->last_displayed_entry;
7438 	while (next && n++ < maxscroll) {
7439 		if (last)
7440 			last = TAILQ_NEXT(last, entry);
7441 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7442 			s->first_displayed_entry = next;
7443 			next = TAILQ_NEXT(next, entry);
7444 		}
7445 	}
7446 
7447 	return NULL;
7448 }
7449 
7450 static const struct got_error *
7451 search_start_ref_view(struct tog_view *view)
7452 {
7453 	struct tog_ref_view_state *s = &view->state.ref;
7454 
7455 	s->matched_entry = NULL;
7456 	return NULL;
7457 }
7458 
7459 static int
7460 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7461 {
7462 	regmatch_t regmatch;
7463 
7464 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7465 	    0) == 0;
7466 }
7467 
7468 static const struct got_error *
7469 search_next_ref_view(struct tog_view *view)
7470 {
7471 	struct tog_ref_view_state *s = &view->state.ref;
7472 	struct tog_reflist_entry *re = NULL;
7473 
7474 	if (!view->searching) {
7475 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7476 		return NULL;
7477 	}
7478 
7479 	if (s->matched_entry) {
7480 		if (view->searching == TOG_SEARCH_FORWARD) {
7481 			if (s->selected_entry)
7482 				re = TAILQ_NEXT(s->selected_entry, entry);
7483 			else
7484 				re = TAILQ_PREV(s->selected_entry,
7485 				    tog_reflist_head, entry);
7486 		} else {
7487 			if (s->selected_entry == NULL)
7488 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7489 			else
7490 				re = TAILQ_PREV(s->selected_entry,
7491 				    tog_reflist_head, entry);
7492 		}
7493 	} else {
7494 		if (s->selected_entry)
7495 			re = s->selected_entry;
7496 		else if (view->searching == TOG_SEARCH_FORWARD)
7497 			re = TAILQ_FIRST(&s->refs);
7498 		else
7499 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7500 	}
7501 
7502 	while (1) {
7503 		if (re == NULL) {
7504 			if (s->matched_entry == NULL) {
7505 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7506 				return NULL;
7507 			}
7508 			if (view->searching == TOG_SEARCH_FORWARD)
7509 				re = TAILQ_FIRST(&s->refs);
7510 			else
7511 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7512 		}
7513 
7514 		if (match_reflist_entry(re, &view->regex)) {
7515 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7516 			s->matched_entry = re;
7517 			break;
7518 		}
7519 
7520 		if (view->searching == TOG_SEARCH_FORWARD)
7521 			re = TAILQ_NEXT(re, entry);
7522 		else
7523 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7524 	}
7525 
7526 	if (s->matched_entry) {
7527 		s->first_displayed_entry = s->matched_entry;
7528 		s->selected = 0;
7529 	}
7530 
7531 	return NULL;
7532 }
7533 
7534 static const struct got_error *
7535 show_ref_view(struct tog_view *view)
7536 {
7537 	const struct got_error *err = NULL;
7538 	struct tog_ref_view_state *s = &view->state.ref;
7539 	struct tog_reflist_entry *re;
7540 	char *line = NULL;
7541 	wchar_t *wline;
7542 	struct tog_color *tc;
7543 	int width, n;
7544 	int limit = view->nlines;
7545 
7546 	werase(view->window);
7547 
7548 	s->ndisplayed = 0;
7549 	if (view_is_hsplit_top(view))
7550 		--limit;  /* border */
7551 
7552 	if (limit == 0)
7553 		return NULL;
7554 
7555 	re = s->first_displayed_entry;
7556 
7557 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7558 	    s->nrefs) == -1)
7559 		return got_error_from_errno("asprintf");
7560 
7561 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7562 	if (err) {
7563 		free(line);
7564 		return err;
7565 	}
7566 	if (view_needs_focus_indication(view))
7567 		wstandout(view->window);
7568 	waddwstr(view->window, wline);
7569 	if (view_needs_focus_indication(view))
7570 		wstandend(view->window);
7571 	free(wline);
7572 	wline = NULL;
7573 	free(line);
7574 	line = NULL;
7575 	if (width < view->ncols - 1)
7576 		waddch(view->window, '\n');
7577 	if (--limit <= 0)
7578 		return NULL;
7579 
7580 	n = 0;
7581 	while (re && limit > 0) {
7582 		char *line = NULL;
7583 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7584 
7585 		if (s->show_date) {
7586 			struct got_commit_object *ci;
7587 			struct got_tag_object *tag;
7588 			struct got_object_id *id;
7589 			struct tm tm;
7590 			time_t t;
7591 
7592 			err = got_ref_resolve(&id, s->repo, re->ref);
7593 			if (err)
7594 				return err;
7595 			err = got_object_open_as_tag(&tag, s->repo, id);
7596 			if (err) {
7597 				if (err->code != GOT_ERR_OBJ_TYPE) {
7598 					free(id);
7599 					return err;
7600 				}
7601 				err = got_object_open_as_commit(&ci, s->repo,
7602 				    id);
7603 				if (err) {
7604 					free(id);
7605 					return err;
7606 				}
7607 				t = got_object_commit_get_committer_time(ci);
7608 				got_object_commit_close(ci);
7609 			} else {
7610 				t = got_object_tag_get_tagger_time(tag);
7611 				got_object_tag_close(tag);
7612 			}
7613 			free(id);
7614 			if (gmtime_r(&t, &tm) == NULL)
7615 				return got_error_from_errno("gmtime_r");
7616 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7617 				return got_error(GOT_ERR_NO_SPACE);
7618 		}
7619 		if (got_ref_is_symbolic(re->ref)) {
7620 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7621 			    ymd : "", got_ref_get_name(re->ref),
7622 			    got_ref_get_symref_target(re->ref)) == -1)
7623 				return got_error_from_errno("asprintf");
7624 		} else if (s->show_ids) {
7625 			struct got_object_id *id;
7626 			char *id_str;
7627 			err = got_ref_resolve(&id, s->repo, re->ref);
7628 			if (err)
7629 				return err;
7630 			err = got_object_id_str(&id_str, id);
7631 			if (err) {
7632 				free(id);
7633 				return err;
7634 			}
7635 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7636 			    got_ref_get_name(re->ref), id_str) == -1) {
7637 				err = got_error_from_errno("asprintf");
7638 				free(id);
7639 				free(id_str);
7640 				return err;
7641 			}
7642 			free(id);
7643 			free(id_str);
7644 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7645 		    got_ref_get_name(re->ref)) == -1)
7646 			return got_error_from_errno("asprintf");
7647 
7648 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7649 		    0, 0);
7650 		if (err) {
7651 			free(line);
7652 			return err;
7653 		}
7654 		if (n == s->selected) {
7655 			if (view->focussed)
7656 				wstandout(view->window);
7657 			s->selected_entry = re;
7658 		}
7659 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7660 		if (tc)
7661 			wattr_on(view->window,
7662 			    COLOR_PAIR(tc->colorpair), NULL);
7663 		waddwstr(view->window, wline);
7664 		if (tc)
7665 			wattr_off(view->window,
7666 			    COLOR_PAIR(tc->colorpair), NULL);
7667 		if (width < view->ncols - 1)
7668 			waddch(view->window, '\n');
7669 		if (n == s->selected && view->focussed)
7670 			wstandend(view->window);
7671 		free(line);
7672 		free(wline);
7673 		wline = NULL;
7674 		n++;
7675 		s->ndisplayed++;
7676 		s->last_displayed_entry = re;
7677 
7678 		limit--;
7679 		re = TAILQ_NEXT(re, entry);
7680 	}
7681 
7682 	view_border(view);
7683 	return err;
7684 }
7685 
7686 static const struct got_error *
7687 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7688     struct tog_reflist_entry *re, struct got_repository *repo)
7689 {
7690 	const struct got_error *err = NULL;
7691 	struct got_object_id *commit_id = NULL;
7692 	struct tog_view *tree_view;
7693 
7694 	*new_view = NULL;
7695 
7696 	err = resolve_reflist_entry(&commit_id, re, repo);
7697 	if (err) {
7698 		if (err->code != GOT_ERR_OBJ_TYPE)
7699 			return err;
7700 		else
7701 			return NULL;
7702 	}
7703 
7704 
7705 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7706 	if (tree_view == NULL) {
7707 		err = got_error_from_errno("view_open");
7708 		goto done;
7709 	}
7710 
7711 	err = open_tree_view(tree_view, commit_id,
7712 	    got_ref_get_name(re->ref), repo);
7713 	if (err)
7714 		goto done;
7715 
7716 	*new_view = tree_view;
7717 done:
7718 	free(commit_id);
7719 	return err;
7720 }
7721 static const struct got_error *
7722 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7723 {
7724 	const struct got_error *err = NULL;
7725 	struct tog_ref_view_state *s = &view->state.ref;
7726 	struct tog_view *log_view, *tree_view;
7727 	struct tog_reflist_entry *re;
7728 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7729 
7730 	switch (ch) {
7731 	case 'i':
7732 		s->show_ids = !s->show_ids;
7733 		view->count = 0;
7734 		break;
7735 	case 'm':
7736 		s->show_date = !s->show_date;
7737 		view->count = 0;
7738 		break;
7739 	case 'o':
7740 		s->sort_by_date = !s->sort_by_date;
7741 		view->count = 0;
7742 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7743 		    got_ref_cmp_by_commit_timestamp_descending :
7744 		    tog_ref_cmp_by_name, s->repo);
7745 		if (err)
7746 			break;
7747 		got_reflist_object_id_map_free(tog_refs_idmap);
7748 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7749 		    &tog_refs, s->repo);
7750 		if (err)
7751 			break;
7752 		ref_view_free_refs(s);
7753 		err = ref_view_load_refs(s);
7754 		break;
7755 	case KEY_ENTER:
7756 	case '\r':
7757 		view->count = 0;
7758 		if (!s->selected_entry)
7759 			break;
7760 		if (view_is_parent_view(view))
7761 			view_get_split(view, &begin_y, &begin_x);
7762 
7763 		err = log_ref_entry(&log_view, begin_y, begin_x,
7764 		    s->selected_entry, s->repo);
7765 		if (err)
7766 			break;
7767 
7768 		if (view_is_parent_view(view) &&
7769 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7770 			err = view_init_hsplit(view, begin_y);
7771 			if (err)
7772 				break;
7773 		}
7774 
7775 		view->focussed = 0;
7776 		log_view->focussed = 1;
7777 		log_view->mode = view->mode;
7778 		log_view->nlines = view->lines - begin_y;
7779 		if (view_is_parent_view(view)) {
7780 			view_transfer_size(log_view, view);
7781 			err = view_close_child(view);
7782 			if (err)
7783 				return err;
7784 			err = view_set_child(view, log_view);
7785 			if (err)
7786 				return err;
7787 			view->focus_child = 1;
7788 		} else
7789 			*new_view = log_view;
7790 		break;
7791 	case 't':
7792 		view->count = 0;
7793 		if (!s->selected_entry)
7794 			break;
7795 		if (view_is_parent_view(view))
7796 			view_get_split(view, &begin_y, &begin_x);
7797 		err = browse_ref_tree(&tree_view, begin_y, begin_x,
7798 		    s->selected_entry, s->repo);
7799 		if (err || tree_view == NULL)
7800 			break;
7801 		if (view_is_parent_view(view) &&
7802 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7803 			err = view_init_hsplit(view, begin_y);
7804 			if (err)
7805 				break;
7806 		}
7807 		view->focussed = 0;
7808 		tree_view->focussed = 1;
7809 		tree_view->mode = view->mode;
7810 		tree_view->nlines = view->lines - begin_y;
7811 		if (view_is_parent_view(view)) {
7812 			view_transfer_size(tree_view, view);
7813 			err = view_close_child(view);
7814 			if (err)
7815 				return err;
7816 			err = view_set_child(view, tree_view);
7817 			if (err)
7818 				return err;
7819 			view->focus_child = 1;
7820 		} else
7821 			*new_view = tree_view;
7822 		break;
7823 	case 'g':
7824 	case KEY_HOME:
7825 		s->selected = 0;
7826 		view->count = 0;
7827 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7828 		break;
7829 	case 'G':
7830 	case KEY_END: {
7831 		int eos = view->nlines - 1;
7832 
7833 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7834 			--eos;  /* border */
7835 		s->selected = 0;
7836 		view->count = 0;
7837 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7838 		for (n = 0; n < eos; n++) {
7839 			if (re == NULL)
7840 				break;
7841 			s->first_displayed_entry = re;
7842 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7843 		}
7844 		if (n > 0)
7845 			s->selected = n - 1;
7846 		break;
7847 	}
7848 	case 'k':
7849 	case KEY_UP:
7850 	case CTRL('p'):
7851 		if (s->selected > 0) {
7852 			s->selected--;
7853 			break;
7854 		}
7855 		ref_scroll_up(s, 1);
7856 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7857 			view->count = 0;
7858 		break;
7859 	case CTRL('u'):
7860 	case 'u':
7861 		nscroll /= 2;
7862 		/* FALL THROUGH */
7863 	case KEY_PPAGE:
7864 	case CTRL('b'):
7865 	case 'b':
7866 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7867 			s->selected -= MIN(nscroll, s->selected);
7868 		ref_scroll_up(s, MAX(0, nscroll));
7869 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7870 			view->count = 0;
7871 		break;
7872 	case 'j':
7873 	case KEY_DOWN:
7874 	case CTRL('n'):
7875 		if (s->selected < s->ndisplayed - 1) {
7876 			s->selected++;
7877 			break;
7878 		}
7879 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7880 			/* can't scroll any further */
7881 			view->count = 0;
7882 			break;
7883 		}
7884 		ref_scroll_down(view, 1);
7885 		break;
7886 	case CTRL('d'):
7887 	case 'd':
7888 		nscroll /= 2;
7889 		/* FALL THROUGH */
7890 	case KEY_NPAGE:
7891 	case CTRL('f'):
7892 	case 'f':
7893 	case ' ':
7894 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7895 			/* can't scroll any further; move cursor down */
7896 			if (s->selected < s->ndisplayed - 1)
7897 				s->selected += MIN(nscroll,
7898 				    s->ndisplayed - s->selected - 1);
7899 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7900 				s->selected += s->ndisplayed - s->selected - 1;
7901 			view->count = 0;
7902 			break;
7903 		}
7904 		ref_scroll_down(view, nscroll);
7905 		break;
7906 	case CTRL('l'):
7907 		view->count = 0;
7908 		tog_free_refs();
7909 		err = tog_load_refs(s->repo, s->sort_by_date);
7910 		if (err)
7911 			break;
7912 		ref_view_free_refs(s);
7913 		err = ref_view_load_refs(s);
7914 		break;
7915 	case KEY_RESIZE:
7916 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7917 			s->selected = view->nlines - 2;
7918 		break;
7919 	default:
7920 		view->count = 0;
7921 		break;
7922 	}
7923 
7924 	return err;
7925 }
7926 
7927 __dead static void
7928 usage_ref(void)
7929 {
7930 	endwin();
7931 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7932 	    getprogname());
7933 	exit(1);
7934 }
7935 
7936 static const struct got_error *
7937 cmd_ref(int argc, char *argv[])
7938 {
7939 	const struct got_error *error;
7940 	struct got_repository *repo = NULL;
7941 	struct got_worktree *worktree = NULL;
7942 	char *cwd = NULL, *repo_path = NULL;
7943 	int ch;
7944 	struct tog_view *view;
7945 	int *pack_fds = NULL;
7946 
7947 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7948 		switch (ch) {
7949 		case 'r':
7950 			repo_path = realpath(optarg, NULL);
7951 			if (repo_path == NULL)
7952 				return got_error_from_errno2("realpath",
7953 				    optarg);
7954 			break;
7955 		default:
7956 			usage_ref();
7957 			/* NOTREACHED */
7958 		}
7959 	}
7960 
7961 	argc -= optind;
7962 	argv += optind;
7963 
7964 	if (argc > 1)
7965 		usage_ref();
7966 
7967 	error = got_repo_pack_fds_open(&pack_fds);
7968 	if (error != NULL)
7969 		goto done;
7970 
7971 	if (repo_path == NULL) {
7972 		cwd = getcwd(NULL, 0);
7973 		if (cwd == NULL)
7974 			return got_error_from_errno("getcwd");
7975 		error = got_worktree_open(&worktree, cwd);
7976 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7977 			goto done;
7978 		if (worktree)
7979 			repo_path =
7980 			    strdup(got_worktree_get_repo_path(worktree));
7981 		else
7982 			repo_path = strdup(cwd);
7983 		if (repo_path == NULL) {
7984 			error = got_error_from_errno("strdup");
7985 			goto done;
7986 		}
7987 	}
7988 
7989 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7990 	if (error != NULL)
7991 		goto done;
7992 
7993 	init_curses();
7994 
7995 	error = apply_unveil(got_repo_get_path(repo), NULL);
7996 	if (error)
7997 		goto done;
7998 
7999 	error = tog_load_refs(repo, 0);
8000 	if (error)
8001 		goto done;
8002 
8003 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8004 	if (view == NULL) {
8005 		error = got_error_from_errno("view_open");
8006 		goto done;
8007 	}
8008 
8009 	error = open_ref_view(view, repo);
8010 	if (error)
8011 		goto done;
8012 
8013 	if (worktree) {
8014 		/* Release work tree lock. */
8015 		got_worktree_close(worktree);
8016 		worktree = NULL;
8017 	}
8018 	error = view_loop(view);
8019 done:
8020 	free(repo_path);
8021 	free(cwd);
8022 	if (repo) {
8023 		const struct got_error *close_err = got_repo_close(repo);
8024 		if (close_err)
8025 			error = close_err;
8026 	}
8027 	if (pack_fds) {
8028 		const struct got_error *pack_err =
8029 		    got_repo_pack_fds_close(pack_fds);
8030 		if (error == NULL)
8031 			error = pack_err;
8032 	}
8033 	tog_free_refs();
8034 	return error;
8035 }
8036 
8037 /*
8038  * If view was scrolled down to move the selected line into view when opening a
8039  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8040  */
8041 static void
8042 offset_selection_up(struct tog_view *view)
8043 {
8044 	switch (view->type) {
8045 	case TOG_VIEW_BLAME: {
8046 		struct tog_blame_view_state *s = &view->state.blame;
8047 		if (s->first_displayed_line == 1) {
8048 			s->selected_line = MAX(s->selected_line - view->offset,
8049 			    1);
8050 			break;
8051 		}
8052 		if (s->first_displayed_line > view->offset)
8053 			s->first_displayed_line -= view->offset;
8054 		else
8055 			s->first_displayed_line = 1;
8056 		s->selected_line += view->offset;
8057 		break;
8058 	}
8059 	case TOG_VIEW_LOG:
8060 		log_scroll_up(&view->state.log, view->offset);
8061 		view->state.log.selected += view->offset;
8062 		break;
8063 	case TOG_VIEW_REF:
8064 		ref_scroll_up(&view->state.ref, view->offset);
8065 		view->state.ref.selected += view->offset;
8066 		break;
8067 	case TOG_VIEW_TREE:
8068 		tree_scroll_up(&view->state.tree, view->offset);
8069 		view->state.tree.selected += view->offset;
8070 		break;
8071 	default:
8072 		break;
8073 	}
8074 
8075 	view->offset = 0;
8076 }
8077 
8078 /*
8079  * If the selected line is in the section of screen covered by the bottom split,
8080  * scroll down offset lines to move it into view and index its new position.
8081  */
8082 static const struct got_error *
8083 offset_selection_down(struct tog_view *view)
8084 {
8085 	const struct got_error	*err = NULL;
8086 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8087 	int			*selected = NULL;
8088 	int			 header, offset;
8089 
8090 	switch (view->type) {
8091 	case TOG_VIEW_BLAME: {
8092 		struct tog_blame_view_state *s = &view->state.blame;
8093 		header = 3;
8094 		scrolld = NULL;
8095 		if (s->selected_line > view->nlines - header) {
8096 			offset = abs(view->nlines - s->selected_line - header);
8097 			s->first_displayed_line += offset;
8098 			s->selected_line -= offset;
8099 			view->offset = offset;
8100 		}
8101 		break;
8102 	}
8103 	case TOG_VIEW_LOG: {
8104 		struct tog_log_view_state *s = &view->state.log;
8105 		scrolld = &log_scroll_down;
8106 		header = view_is_parent_view(view) ? 3 : 2;
8107 		selected = &s->selected;
8108 		break;
8109 	}
8110 	case TOG_VIEW_REF: {
8111 		struct tog_ref_view_state *s = &view->state.ref;
8112 		scrolld = &ref_scroll_down;
8113 		header = 3;
8114 		selected = &s->selected;
8115 		break;
8116 	}
8117 	case TOG_VIEW_TREE: {
8118 		struct tog_tree_view_state *s = &view->state.tree;
8119 		scrolld = &tree_scroll_down;
8120 		header = 5;
8121 		selected = &s->selected;
8122 		break;
8123 	}
8124 	default:
8125 		selected = NULL;
8126 		scrolld = NULL;
8127 		header = 0;
8128 		break;
8129 	}
8130 
8131 	if (selected && *selected > view->nlines - header) {
8132 		offset = abs(view->nlines - *selected - header);
8133 		view->offset = offset;
8134 		if (scrolld && offset) {
8135 			err = scrolld(view, offset);
8136 			*selected -= offset;
8137 		}
8138 	}
8139 
8140 	return err;
8141 }
8142 
8143 static void
8144 list_commands(FILE *fp)
8145 {
8146 	size_t i;
8147 
8148 	fprintf(fp, "commands:");
8149 	for (i = 0; i < nitems(tog_commands); i++) {
8150 		const struct tog_cmd *cmd = &tog_commands[i];
8151 		fprintf(fp, " %s", cmd->name);
8152 	}
8153 	fputc('\n', fp);
8154 }
8155 
8156 __dead static void
8157 usage(int hflag, int status)
8158 {
8159 	FILE *fp = (status == 0) ? stdout : stderr;
8160 
8161 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8162 	    getprogname());
8163 	if (hflag) {
8164 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8165 		list_commands(fp);
8166 	}
8167 	exit(status);
8168 }
8169 
8170 static char **
8171 make_argv(int argc, ...)
8172 {
8173 	va_list ap;
8174 	char **argv;
8175 	int i;
8176 
8177 	va_start(ap, argc);
8178 
8179 	argv = calloc(argc, sizeof(char *));
8180 	if (argv == NULL)
8181 		err(1, "calloc");
8182 	for (i = 0; i < argc; i++) {
8183 		argv[i] = strdup(va_arg(ap, char *));
8184 		if (argv[i] == NULL)
8185 			err(1, "strdup");
8186 	}
8187 
8188 	va_end(ap);
8189 	return argv;
8190 }
8191 
8192 /*
8193  * Try to convert 'tog path' into a 'tog log path' command.
8194  * The user could simply have mistyped the command rather than knowingly
8195  * provided a path. So check whether argv[0] can in fact be resolved
8196  * to a path in the HEAD commit and print a special error if not.
8197  * This hack is for mpi@ <3
8198  */
8199 static const struct got_error *
8200 tog_log_with_path(int argc, char *argv[])
8201 {
8202 	const struct got_error *error = NULL, *close_err;
8203 	const struct tog_cmd *cmd = NULL;
8204 	struct got_repository *repo = NULL;
8205 	struct got_worktree *worktree = NULL;
8206 	struct got_object_id *commit_id = NULL, *id = NULL;
8207 	struct got_commit_object *commit = NULL;
8208 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8209 	char *commit_id_str = NULL, **cmd_argv = NULL;
8210 	int *pack_fds = NULL;
8211 
8212 	cwd = getcwd(NULL, 0);
8213 	if (cwd == NULL)
8214 		return got_error_from_errno("getcwd");
8215 
8216 	error = got_repo_pack_fds_open(&pack_fds);
8217 	if (error != NULL)
8218 		goto done;
8219 
8220 	error = got_worktree_open(&worktree, cwd);
8221 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8222 		goto done;
8223 
8224 	if (worktree)
8225 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8226 	else
8227 		repo_path = strdup(cwd);
8228 	if (repo_path == NULL) {
8229 		error = got_error_from_errno("strdup");
8230 		goto done;
8231 	}
8232 
8233 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8234 	if (error != NULL)
8235 		goto done;
8236 
8237 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8238 	    repo, worktree);
8239 	if (error)
8240 		goto done;
8241 
8242 	error = tog_load_refs(repo, 0);
8243 	if (error)
8244 		goto done;
8245 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8246 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8247 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8248 	if (error)
8249 		goto done;
8250 
8251 	if (worktree) {
8252 		got_worktree_close(worktree);
8253 		worktree = NULL;
8254 	}
8255 
8256 	error = got_object_open_as_commit(&commit, repo, commit_id);
8257 	if (error)
8258 		goto done;
8259 
8260 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8261 	if (error) {
8262 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8263 			goto done;
8264 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8265 		    getprogname(), argv[0]);
8266 		usage(1, 1);
8267 		/* not reached */
8268 	}
8269 
8270 	close_err = got_repo_close(repo);
8271 	if (error == NULL)
8272 		error = close_err;
8273 	repo = NULL;
8274 
8275 	error = got_object_id_str(&commit_id_str, commit_id);
8276 	if (error)
8277 		goto done;
8278 
8279 	cmd = &tog_commands[0]; /* log */
8280 	argc = 4;
8281 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8282 	error = cmd->cmd_main(argc, cmd_argv);
8283 done:
8284 	if (repo) {
8285 		close_err = got_repo_close(repo);
8286 		if (error == NULL)
8287 			error = close_err;
8288 	}
8289 	if (commit)
8290 		got_object_commit_close(commit);
8291 	if (worktree)
8292 		got_worktree_close(worktree);
8293 	if (pack_fds) {
8294 		const struct got_error *pack_err =
8295 		    got_repo_pack_fds_close(pack_fds);
8296 		if (error == NULL)
8297 			error = pack_err;
8298 	}
8299 	free(id);
8300 	free(commit_id_str);
8301 	free(commit_id);
8302 	free(cwd);
8303 	free(repo_path);
8304 	free(in_repo_path);
8305 	if (cmd_argv) {
8306 		int i;
8307 		for (i = 0; i < argc; i++)
8308 			free(cmd_argv[i]);
8309 		free(cmd_argv);
8310 	}
8311 	tog_free_refs();
8312 	return error;
8313 }
8314 
8315 int
8316 main(int argc, char *argv[])
8317 {
8318 	const struct got_error *error = NULL;
8319 	const struct tog_cmd *cmd = NULL;
8320 	int ch, hflag = 0, Vflag = 0;
8321 	char **cmd_argv = NULL;
8322 	static const struct option longopts[] = {
8323 	    { "version", no_argument, NULL, 'V' },
8324 	    { NULL, 0, NULL, 0}
8325 	};
8326 	char *diff_algo_str = NULL;
8327 
8328 	setlocale(LC_CTYPE, "");
8329 
8330 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8331 		switch (ch) {
8332 		case 'h':
8333 			hflag = 1;
8334 			break;
8335 		case 'V':
8336 			Vflag = 1;
8337 			break;
8338 		default:
8339 			usage(hflag, 1);
8340 			/* NOTREACHED */
8341 		}
8342 	}
8343 
8344 	argc -= optind;
8345 	argv += optind;
8346 	optind = 1;
8347 	optreset = 1;
8348 
8349 	if (Vflag) {
8350 		got_version_print_str();
8351 		return 0;
8352 	}
8353 
8354 #ifndef PROFILE
8355 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8356 	    NULL) == -1)
8357 		err(1, "pledge");
8358 #endif
8359 
8360 	if (argc == 0) {
8361 		if (hflag)
8362 			usage(hflag, 0);
8363 		/* Build an argument vector which runs a default command. */
8364 		cmd = &tog_commands[0];
8365 		argc = 1;
8366 		cmd_argv = make_argv(argc, cmd->name);
8367 	} else {
8368 		size_t i;
8369 
8370 		/* Did the user specify a command? */
8371 		for (i = 0; i < nitems(tog_commands); i++) {
8372 			if (strncmp(tog_commands[i].name, argv[0],
8373 			    strlen(argv[0])) == 0) {
8374 				cmd = &tog_commands[i];
8375 				break;
8376 			}
8377 		}
8378 	}
8379 
8380 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8381 	if (diff_algo_str) {
8382 		if (strcasecmp(diff_algo_str, "patience") == 0)
8383 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8384 		if (strcasecmp(diff_algo_str, "myers") == 0)
8385 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8386 	}
8387 
8388 	if (cmd == NULL) {
8389 		if (argc != 1)
8390 			usage(0, 1);
8391 		/* No command specified; try log with a path */
8392 		error = tog_log_with_path(argc, argv);
8393 	} else {
8394 		if (hflag)
8395 			cmd->cmd_usage();
8396 		else
8397 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8398 	}
8399 
8400 	endwin();
8401 	putchar('\n');
8402 	if (cmd_argv) {
8403 		int i;
8404 		for (i = 0; i < argc; i++)
8405 			free(cmd_argv[i]);
8406 		free(cmd_argv);
8407 	}
8408 
8409 	if (error && error->code != GOT_ERR_CANCELLED)
8410 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8411 	return 0;
8412 }