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