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 	*x = 0;
2889 	*y = 0;
2890 
2891 	mode = getenv("TOG_VIEW_SPLIT_MODE");
2892 
2893 	if (!mode || mode[0] != 'h') {
2894 		view->mode = TOG_VIEW_SPLIT_VERT;
2895 		*x = view_split_begin_x(view->begin_x);
2896 	} else if (mode && mode[0] == 'h') {
2897 		view->mode = TOG_VIEW_SPLIT_HRZN;
2898 		*y = view_split_begin_y(view->lines);
2899 	}
2900 }
2901 
2902 /* Split view horizontally at y and offset view->state->selected line. */
2903 static const struct got_error *
2904 view_init_hsplit(struct tog_view *view, int y)
2905 {
2906 	const struct got_error *err = NULL;
2907 
2908 	view->nlines = y;
2909 	err = view_resize(view);
2910 	if (err)
2911 		return err;
2912 
2913 	err = offset_selection_down(view);
2914 
2915 	return err;
2916 }
2917 
2918 static const struct got_error *
2919 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
2920 {
2921 	const struct got_error *err = NULL;
2922 	struct tog_log_view_state *s = &view->state.log;
2923 	struct tog_view *diff_view = NULL, *tree_view = NULL;
2924 	struct tog_view *ref_view = NULL;
2925 	struct commit_queue_entry *entry;
2926 	int begin_x = 0, begin_y = 0, eos, n, nscroll;
2927 
2928 	if (s->thread_args.load_all) {
2929 		if (ch == KEY_BACKSPACE)
2930 			s->thread_args.load_all = 0;
2931 		else if (s->thread_args.log_complete) {
2932 			err = log_move_cursor_down(view, s->commits.ncommits);
2933 			s->thread_args.load_all = 0;
2934 		}
2935 		return err;
2936 	}
2937 
2938 	eos = nscroll = view->nlines - 1;
2939 	if (view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
2940 	    view_is_splitscreen(view->child))
2941 		--eos;  /* border */
2942 
2943 
2944 	switch (ch) {
2945 	case 'q':
2946 		s->quit = 1;
2947 		break;
2948 	case '0':
2949 		view->x = 0;
2950 		break;
2951 	case '$':
2952 		view->x = MAX(view->maxx - view->ncols / 2, 0);
2953 		view->count = 0;
2954 		break;
2955 	case KEY_RIGHT:
2956 	case 'l':
2957 		if (view->x + view->ncols / 2 < view->maxx)
2958 			view->x += 2;  /* move two columns right */
2959 		else
2960 			view->count = 0;
2961 		break;
2962 	case KEY_LEFT:
2963 	case 'h':
2964 		view->x -= MIN(view->x, 2);  /* move two columns back */
2965 		if (view->x <= 0)
2966 			view->count = 0;
2967 		break;
2968 	case 'k':
2969 	case KEY_UP:
2970 	case '<':
2971 	case ',':
2972 	case CTRL('p'):
2973 		log_move_cursor_up(view, 0, 0);
2974 		break;
2975 	case 'g':
2976 	case KEY_HOME:
2977 		log_move_cursor_up(view, 0, 1);
2978 		view->count = 0;
2979 		break;
2980 	case CTRL('u'):
2981 	case 'u':
2982 		nscroll /= 2;
2983 		/* FALL THROUGH */
2984 	case KEY_PPAGE:
2985 	case CTRL('b'):
2986 	case 'b':
2987 		log_move_cursor_up(view, nscroll, 0);
2988 		break;
2989 	case 'j':
2990 	case KEY_DOWN:
2991 	case '>':
2992 	case '.':
2993 	case CTRL('n'):
2994 		err = log_move_cursor_down(view, 0);
2995 		break;
2996 	case 'G':
2997 	case KEY_END: {
2998 		/* We don't know yet how many commits, so we're forced to
2999 		 * traverse them all. */
3000 		view->count = 0;
3001 		if (!s->thread_args.log_complete) {
3002 			s->thread_args.load_all = 1;
3003 			return trigger_log_thread(view, 0);
3004 		}
3005 
3006 		s->selected = 0;
3007 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3008 		for (n = 0; n < eos; n++) {
3009 			if (entry == NULL)
3010 				break;
3011 			s->first_displayed_entry = entry;
3012 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3013 		}
3014 		if (n > 0)
3015 			s->selected = n - 1;
3016 		select_commit(s);
3017 		break;
3018 	}
3019 	case CTRL('d'):
3020 	case 'd':
3021 		nscroll /= 2;
3022 		/* FALL THROUGH */
3023 	case KEY_NPAGE:
3024 	case CTRL('f'):
3025 	case 'f':
3026 	case ' ':
3027 		err = log_move_cursor_down(view, nscroll);
3028 		break;
3029 	case KEY_RESIZE:
3030 		if (s->selected > view->nlines - 2)
3031 			s->selected = view->nlines - 2;
3032 		if (s->selected > s->commits.ncommits - 1)
3033 			s->selected = s->commits.ncommits - 1;
3034 		select_commit(s);
3035 		if (s->commits.ncommits < view->nlines - 1 &&
3036 		    !s->thread_args.log_complete) {
3037 			s->thread_args.commits_needed += (view->nlines - 1) -
3038 			    s->commits.ncommits;
3039 			err = trigger_log_thread(view, 1);
3040 		}
3041 		break;
3042 	case KEY_ENTER:
3043 	case '\r': {
3044 		view->count = 0;
3045 		if (s->selected_entry == NULL)
3046 			break;
3047 
3048 		/* get dimensions--don't split till initialisation succeeds */
3049 		if (view_is_parent_view(view))
3050 			view_get_split(view, &begin_y, &begin_x);
3051 
3052 		err = open_diff_view_for_commit(&diff_view, begin_y, begin_x,
3053 		    s->selected_entry->commit, s->selected_entry->id,
3054 		    view, s->repo);
3055 		if (err)
3056 			break;
3057 
3058 		if (view->mode == TOG_VIEW_SPLIT_HRZN) {  /* safe to split */
3059 			err = view_init_hsplit(view, begin_y);
3060 			if (err)
3061 				break;
3062 		}
3063 
3064 		view->focussed = 0;
3065 		diff_view->focussed = 1;
3066 		diff_view->mode = view->mode;
3067 		diff_view->nlines = view->lines - begin_y;
3068 
3069 		if (view_is_parent_view(view)) {
3070 			err = view_close_child(view);
3071 			if (err)
3072 				return err;
3073 			err = view_set_child(view, diff_view);
3074 			if (err)
3075 				return err;
3076 			view->focus_child = 1;
3077 		} else
3078 			*new_view = diff_view;
3079 		break;
3080 	}
3081 	case 't':
3082 		view->count = 0;
3083 		if (s->selected_entry == NULL)
3084 			break;
3085 		if (view_is_parent_view(view))
3086 			begin_x = view_split_begin_x(view->begin_x);
3087 		err = browse_commit_tree(&tree_view, begin_x,
3088 		    s->selected_entry, s->in_repo_path, s->head_ref_name,
3089 		    s->repo);
3090 		if (err)
3091 			break;
3092 		view->focussed = 0;
3093 		tree_view->focussed = 1;
3094 		if (view_is_parent_view(view)) {
3095 			err = view_close_child(view);
3096 			if (err)
3097 				return err;
3098 			err = view_set_child(view, tree_view);
3099 			if (err)
3100 				return err;
3101 			view->focus_child = 1;
3102 		} else
3103 			*new_view = tree_view;
3104 		break;
3105 	case KEY_BACKSPACE:
3106 	case CTRL('l'):
3107 	case 'B':
3108 		view->count = 0;
3109 		if (ch == KEY_BACKSPACE &&
3110 		    got_path_is_root_dir(s->in_repo_path))
3111 			break;
3112 		err = stop_log_thread(s);
3113 		if (err)
3114 			return err;
3115 		if (ch == KEY_BACKSPACE) {
3116 			char *parent_path;
3117 			err = got_path_dirname(&parent_path, s->in_repo_path);
3118 			if (err)
3119 				return err;
3120 			free(s->in_repo_path);
3121 			s->in_repo_path = parent_path;
3122 			s->thread_args.in_repo_path = s->in_repo_path;
3123 		} else if (ch == CTRL('l')) {
3124 			struct got_object_id *start_id;
3125 			err = got_repo_match_object_id(&start_id, NULL,
3126 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3127 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3128 			if (err)
3129 				return err;
3130 			free(s->start_id);
3131 			s->start_id = start_id;
3132 			s->thread_args.start_id = s->start_id;
3133 		} else /* 'B' */
3134 			s->log_branches = !s->log_branches;
3135 
3136 		if (s->thread_args.pack_fds == NULL) {
3137 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3138 			if (err)
3139 				return err;
3140 		}
3141 		err = got_repo_open(&s->thread_args.repo,
3142 		    got_repo_get_path(s->repo), NULL,
3143 		    s->thread_args.pack_fds);
3144 		if (err)
3145 			return err;
3146 		tog_free_refs();
3147 		err = tog_load_refs(s->repo, 0);
3148 		if (err)
3149 			return err;
3150 		err = got_commit_graph_open(&s->thread_args.graph,
3151 		    s->in_repo_path, !s->log_branches);
3152 		if (err)
3153 			return err;
3154 		err = got_commit_graph_iter_start(s->thread_args.graph,
3155 		    s->start_id, s->repo, NULL, NULL);
3156 		if (err)
3157 			return err;
3158 		free_commits(&s->commits);
3159 		s->first_displayed_entry = NULL;
3160 		s->last_displayed_entry = NULL;
3161 		s->selected_entry = NULL;
3162 		s->selected = 0;
3163 		s->thread_args.log_complete = 0;
3164 		s->quit = 0;
3165 		s->thread_args.commits_needed = view->lines;
3166 		s->matched_entry = NULL;
3167 		s->search_entry = NULL;
3168 		break;
3169 	case 'r':
3170 		view->count = 0;
3171 		if (view_is_parent_view(view))
3172 			begin_x = view_split_begin_x(view->begin_x);
3173 		ref_view = view_open(view->nlines, view->ncols,
3174 		    view->begin_y, begin_x, TOG_VIEW_REF);
3175 		if (ref_view == NULL)
3176 			return got_error_from_errno("view_open");
3177 		err = open_ref_view(ref_view, s->repo);
3178 		if (err) {
3179 			view_close(ref_view);
3180 			return err;
3181 		}
3182 		view->focussed = 0;
3183 		ref_view->focussed = 1;
3184 		if (view_is_parent_view(view)) {
3185 			err = view_close_child(view);
3186 			if (err)
3187 				return err;
3188 			err = view_set_child(view, ref_view);
3189 			if (err)
3190 				return err;
3191 			view->focus_child = 1;
3192 		} else
3193 			*new_view = ref_view;
3194 		break;
3195 	default:
3196 		view->count = 0;
3197 		break;
3198 	}
3199 
3200 	return err;
3201 }
3202 
3203 static const struct got_error *
3204 apply_unveil(const char *repo_path, const char *worktree_path)
3205 {
3206 	const struct got_error *error;
3207 
3208 #ifdef PROFILE
3209 	if (unveil("gmon.out", "rwc") != 0)
3210 		return got_error_from_errno2("unveil", "gmon.out");
3211 #endif
3212 	if (repo_path && unveil(repo_path, "r") != 0)
3213 		return got_error_from_errno2("unveil", repo_path);
3214 
3215 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3216 		return got_error_from_errno2("unveil", worktree_path);
3217 
3218 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3219 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3220 
3221 	error = got_privsep_unveil_exec_helpers();
3222 	if (error != NULL)
3223 		return error;
3224 
3225 	if (unveil(NULL, NULL) != 0)
3226 		return got_error_from_errno("unveil");
3227 
3228 	return NULL;
3229 }
3230 
3231 static void
3232 init_curses(void)
3233 {
3234 	/*
3235 	 * Override default signal handlers before starting ncurses.
3236 	 * This should prevent ncurses from installing its own
3237 	 * broken cleanup() signal handler.
3238 	 */
3239 	signal(SIGWINCH, tog_sigwinch);
3240 	signal(SIGPIPE, tog_sigpipe);
3241 	signal(SIGCONT, tog_sigcont);
3242 	signal(SIGINT, tog_sigint);
3243 	signal(SIGTERM, tog_sigterm);
3244 
3245 	initscr();
3246 	cbreak();
3247 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3248 	noecho();
3249 	nonl();
3250 	intrflush(stdscr, FALSE);
3251 	keypad(stdscr, TRUE);
3252 	curs_set(0);
3253 	if (getenv("TOG_COLORS") != NULL) {
3254 		start_color();
3255 		use_default_colors();
3256 	}
3257 }
3258 
3259 static const struct got_error *
3260 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3261     struct got_repository *repo, struct got_worktree *worktree)
3262 {
3263 	const struct got_error *err = NULL;
3264 
3265 	if (argc == 0) {
3266 		*in_repo_path = strdup("/");
3267 		if (*in_repo_path == NULL)
3268 			return got_error_from_errno("strdup");
3269 		return NULL;
3270 	}
3271 
3272 	if (worktree) {
3273 		const char *prefix = got_worktree_get_path_prefix(worktree);
3274 		char *p;
3275 
3276 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3277 		if (err)
3278 			return err;
3279 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3280 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3281 		    p) == -1) {
3282 			err = got_error_from_errno("asprintf");
3283 			*in_repo_path = NULL;
3284 		}
3285 		free(p);
3286 	} else
3287 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3288 
3289 	return err;
3290 }
3291 
3292 static const struct got_error *
3293 cmd_log(int argc, char *argv[])
3294 {
3295 	const struct got_error *error;
3296 	struct got_repository *repo = NULL;
3297 	struct got_worktree *worktree = NULL;
3298 	struct got_object_id *start_id = NULL;
3299 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3300 	char *start_commit = NULL, *label = NULL;
3301 	struct got_reference *ref = NULL;
3302 	const char *head_ref_name = NULL;
3303 	int ch, log_branches = 0;
3304 	struct tog_view *view;
3305 	int *pack_fds = NULL;
3306 
3307 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3308 		switch (ch) {
3309 		case 'b':
3310 			log_branches = 1;
3311 			break;
3312 		case 'c':
3313 			start_commit = optarg;
3314 			break;
3315 		case 'r':
3316 			repo_path = realpath(optarg, NULL);
3317 			if (repo_path == NULL)
3318 				return got_error_from_errno2("realpath",
3319 				    optarg);
3320 			break;
3321 		default:
3322 			usage_log();
3323 			/* NOTREACHED */
3324 		}
3325 	}
3326 
3327 	argc -= optind;
3328 	argv += optind;
3329 
3330 	if (argc > 1)
3331 		usage_log();
3332 
3333 	error = got_repo_pack_fds_open(&pack_fds);
3334 	if (error != NULL)
3335 		goto done;
3336 
3337 	if (repo_path == NULL) {
3338 		cwd = getcwd(NULL, 0);
3339 		if (cwd == NULL)
3340 			return got_error_from_errno("getcwd");
3341 		error = got_worktree_open(&worktree, cwd);
3342 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3343 			goto done;
3344 		if (worktree)
3345 			repo_path =
3346 			    strdup(got_worktree_get_repo_path(worktree));
3347 		else
3348 			repo_path = strdup(cwd);
3349 		if (repo_path == NULL) {
3350 			error = got_error_from_errno("strdup");
3351 			goto done;
3352 		}
3353 	}
3354 
3355 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3356 	if (error != NULL)
3357 		goto done;
3358 
3359 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3360 	    repo, worktree);
3361 	if (error)
3362 		goto done;
3363 
3364 	init_curses();
3365 
3366 	error = apply_unveil(got_repo_get_path(repo),
3367 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3368 	if (error)
3369 		goto done;
3370 
3371 	/* already loaded by tog_log_with_path()? */
3372 	if (TAILQ_EMPTY(&tog_refs)) {
3373 		error = tog_load_refs(repo, 0);
3374 		if (error)
3375 			goto done;
3376 	}
3377 
3378 	if (start_commit == NULL) {
3379 		error = got_repo_match_object_id(&start_id, &label,
3380 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3381 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3382 		if (error)
3383 			goto done;
3384 		head_ref_name = label;
3385 	} else {
3386 		error = got_ref_open(&ref, repo, start_commit, 0);
3387 		if (error == NULL)
3388 			head_ref_name = got_ref_get_name(ref);
3389 		else if (error->code != GOT_ERR_NOT_REF)
3390 			goto done;
3391 		error = got_repo_match_object_id(&start_id, NULL,
3392 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3393 		if (error)
3394 			goto done;
3395 	}
3396 
3397 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3398 	if (view == NULL) {
3399 		error = got_error_from_errno("view_open");
3400 		goto done;
3401 	}
3402 	error = open_log_view(view, start_id, repo, head_ref_name,
3403 	    in_repo_path, log_branches);
3404 	if (error)
3405 		goto done;
3406 	if (worktree) {
3407 		/* Release work tree lock. */
3408 		got_worktree_close(worktree);
3409 		worktree = NULL;
3410 	}
3411 	error = view_loop(view);
3412 done:
3413 	free(in_repo_path);
3414 	free(repo_path);
3415 	free(cwd);
3416 	free(start_id);
3417 	free(label);
3418 	if (ref)
3419 		got_ref_close(ref);
3420 	if (repo) {
3421 		const struct got_error *close_err = got_repo_close(repo);
3422 		if (error == NULL)
3423 			error = close_err;
3424 	}
3425 	if (worktree)
3426 		got_worktree_close(worktree);
3427 	if (pack_fds) {
3428 		const struct got_error *pack_err =
3429 		    got_repo_pack_fds_close(pack_fds);
3430 		if (error == NULL)
3431 			error = pack_err;
3432 	}
3433 	tog_free_refs();
3434 	return error;
3435 }
3436 
3437 __dead static void
3438 usage_diff(void)
3439 {
3440 	endwin();
3441 	fprintf(stderr, "usage: %s diff [-a] [-C number] [-r repository-path] "
3442 	    "[-w] object1 object2\n", getprogname());
3443 	exit(1);
3444 }
3445 
3446 static int
3447 match_line(const char *line, regex_t *regex, size_t nmatch,
3448     regmatch_t *regmatch)
3449 {
3450 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3451 }
3452 
3453 static struct tog_color *
3454 match_color(struct tog_colors *colors, const char *line)
3455 {
3456 	struct tog_color *tc = NULL;
3457 
3458 	STAILQ_FOREACH(tc, colors, entry) {
3459 		if (match_line(line, &tc->regex, 0, NULL))
3460 			return tc;
3461 	}
3462 
3463 	return NULL;
3464 }
3465 
3466 static const struct got_error *
3467 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3468     WINDOW *window, int skipcol, regmatch_t *regmatch)
3469 {
3470 	const struct got_error *err = NULL;
3471 	char *exstr = NULL;
3472 	wchar_t *wline = NULL;
3473 	int rme, rms, n, width, scrollx;
3474 	int width0 = 0, width1 = 0, width2 = 0;
3475 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3476 
3477 	*wtotal = 0;
3478 
3479 	rms = regmatch->rm_so;
3480 	rme = regmatch->rm_eo;
3481 
3482 	err = expand_tab(&exstr, line);
3483 	if (err)
3484 		return err;
3485 
3486 	/* Split the line into 3 segments, according to match offsets. */
3487 	seg0 = strndup(exstr, rms);
3488 	if (seg0 == NULL) {
3489 		err = got_error_from_errno("strndup");
3490 		goto done;
3491 	}
3492 	seg1 = strndup(exstr + rms, rme - rms);
3493 	if (seg1 == NULL) {
3494 		err = got_error_from_errno("strndup");
3495 		goto done;
3496 	}
3497 	seg2 = strdup(exstr + rme);
3498 	if (seg2 == NULL) {
3499 		err = got_error_from_errno("strndup");
3500 		goto done;
3501 	}
3502 
3503 	/* draw up to matched token if we haven't scrolled past it */
3504 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3505 	    col_tab_align, 1);
3506 	if (err)
3507 		goto done;
3508 	n = MAX(width0 - skipcol, 0);
3509 	if (n) {
3510 		free(wline);
3511 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3512 		    wlimit, col_tab_align, 1);
3513 		if (err)
3514 			goto done;
3515 		waddwstr(window, &wline[scrollx]);
3516 		wlimit -= width;
3517 		*wtotal += width;
3518 	}
3519 
3520 	if (wlimit > 0) {
3521 		int i = 0, w = 0;
3522 		size_t wlen;
3523 
3524 		free(wline);
3525 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3526 		    col_tab_align, 1);
3527 		if (err)
3528 			goto done;
3529 		wlen = wcslen(wline);
3530 		while (i < wlen) {
3531 			width = wcwidth(wline[i]);
3532 			if (width == -1) {
3533 				/* should not happen, tabs are expanded */
3534 				err = got_error(GOT_ERR_RANGE);
3535 				goto done;
3536 			}
3537 			if (width0 + w + width > skipcol)
3538 				break;
3539 			w += width;
3540 			i++;
3541 		}
3542 		/* draw (visible part of) matched token (if scrolled into it) */
3543 		if (width1 - w > 0) {
3544 			wattron(window, A_STANDOUT);
3545 			waddwstr(window, &wline[i]);
3546 			wattroff(window, A_STANDOUT);
3547 			wlimit -= (width1 - w);
3548 			*wtotal += (width1 - w);
3549 		}
3550 	}
3551 
3552 	if (wlimit > 0) {  /* draw rest of line */
3553 		free(wline);
3554 		if (skipcol > width0 + width1) {
3555 			err = format_line(&wline, &width2, &scrollx, seg2,
3556 			    skipcol - (width0 + width1), wlimit,
3557 			    col_tab_align, 1);
3558 			if (err)
3559 				goto done;
3560 			waddwstr(window, &wline[scrollx]);
3561 		} else {
3562 			err = format_line(&wline, &width2, NULL, seg2, 0,
3563 			    wlimit, col_tab_align, 1);
3564 			if (err)
3565 				goto done;
3566 			waddwstr(window, wline);
3567 		}
3568 		*wtotal += width2;
3569 	}
3570 done:
3571 	free(wline);
3572 	free(exstr);
3573 	free(seg0);
3574 	free(seg1);
3575 	free(seg2);
3576 	return err;
3577 }
3578 
3579 static const struct got_error *
3580 draw_file(struct tog_view *view, const char *header)
3581 {
3582 	struct tog_diff_view_state *s = &view->state.diff;
3583 	regmatch_t *regmatch = &view->regmatch;
3584 	const struct got_error *err;
3585 	int nprinted = 0;
3586 	char *line;
3587 	size_t linesize = 0;
3588 	ssize_t linelen;
3589 	struct tog_color *tc;
3590 	wchar_t *wline;
3591 	int width;
3592 	int max_lines = view->nlines;
3593 	int nlines = s->nlines;
3594 	off_t line_offset;
3595 
3596 	line_offset = s->line_offsets[s->first_displayed_line - 1];
3597 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3598 		return got_error_from_errno("fseek");
3599 
3600 	werase(view->window);
3601 
3602 	if (header) {
3603 		if (asprintf(&line, "[%d/%d] %s",
3604 		    s->first_displayed_line - 1 + s->selected_line, nlines,
3605 		    header) == -1)
3606 			return got_error_from_errno("asprintf");
3607 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3608 		    0, 0);
3609 		free(line);
3610 		if (err)
3611 			return err;
3612 
3613 		if (view_needs_focus_indication(view))
3614 			wstandout(view->window);
3615 		waddwstr(view->window, wline);
3616 		free(wline);
3617 		wline = NULL;
3618 		if (view_needs_focus_indication(view))
3619 			wstandend(view->window);
3620 		if (width <= view->ncols - 1)
3621 			waddch(view->window, '\n');
3622 
3623 		if (max_lines <= 1)
3624 			return NULL;
3625 		max_lines--;
3626 	}
3627 
3628 	s->eof = 0;
3629 	view->maxx = 0;
3630 	line = NULL;
3631 	while (max_lines > 0 && nprinted < max_lines) {
3632 		linelen = getline(&line, &linesize, s->f);
3633 		if (linelen == -1) {
3634 			if (feof(s->f)) {
3635 				s->eof = 1;
3636 				break;
3637 			}
3638 			free(line);
3639 			return got_ferror(s->f, GOT_ERR_IO);
3640 		}
3641 
3642 		/* Set view->maxx based on full line length. */
3643 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
3644 		    view->x ? 1 : 0);
3645 		if (err) {
3646 			free(line);
3647 			return err;
3648 		}
3649 		view->maxx = MAX(view->maxx, width);
3650 		free(wline);
3651 		wline = NULL;
3652 
3653 		tc = match_color(&s->colors, line);
3654 		if (tc)
3655 			wattr_on(view->window,
3656 			    COLOR_PAIR(tc->colorpair), NULL);
3657 		if (s->first_displayed_line + nprinted == s->matched_line &&
3658 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
3659 			err = add_matched_line(&width, line, view->ncols, 0,
3660 			    view->window, view->x, regmatch);
3661 			if (err) {
3662 				free(line);
3663 				return err;
3664 			}
3665 		} else {
3666 			int skip;
3667 			err = format_line(&wline, &width, &skip, line,
3668 			    view->x, view->ncols, 0, view->x ? 1 : 0);
3669 			if (err) {
3670 				free(line);
3671 				return err;
3672 			}
3673 			waddwstr(view->window, &wline[skip]);
3674 			free(wline);
3675 			wline = NULL;
3676 		}
3677 		if (tc)
3678 			wattr_off(view->window,
3679 			    COLOR_PAIR(tc->colorpair), NULL);
3680 		if (width <= view->ncols - 1)
3681 			waddch(view->window, '\n');
3682 		nprinted++;
3683 	}
3684 	free(line);
3685 	if (nprinted >= 1)
3686 		s->last_displayed_line = s->first_displayed_line +
3687 		    (nprinted - 1);
3688 	else
3689 		s->last_displayed_line = s->first_displayed_line;
3690 
3691 	view_border(view);
3692 
3693 	if (s->eof) {
3694 		while (nprinted < view->nlines) {
3695 			waddch(view->window, '\n');
3696 			nprinted++;
3697 		}
3698 
3699 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
3700 		    view->ncols, 0, 0);
3701 		if (err) {
3702 			return err;
3703 		}
3704 
3705 		wstandout(view->window);
3706 		waddwstr(view->window, wline);
3707 		free(wline);
3708 		wline = NULL;
3709 		wstandend(view->window);
3710 	}
3711 
3712 	return NULL;
3713 }
3714 
3715 static char *
3716 get_datestr(time_t *time, char *datebuf)
3717 {
3718 	struct tm mytm, *tm;
3719 	char *p, *s;
3720 
3721 	tm = gmtime_r(time, &mytm);
3722 	if (tm == NULL)
3723 		return NULL;
3724 	s = asctime_r(tm, datebuf);
3725 	if (s == NULL)
3726 		return NULL;
3727 	p = strchr(s, '\n');
3728 	if (p)
3729 		*p = '\0';
3730 	return s;
3731 }
3732 
3733 static const struct got_error *
3734 get_changed_paths(struct got_pathlist_head *paths,
3735     struct got_commit_object *commit, struct got_repository *repo)
3736 {
3737 	const struct got_error *err = NULL;
3738 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
3739 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
3740 	struct got_object_qid *qid;
3741 
3742 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3743 	if (qid != NULL) {
3744 		struct got_commit_object *pcommit;
3745 		err = got_object_open_as_commit(&pcommit, repo,
3746 		    &qid->id);
3747 		if (err)
3748 			return err;
3749 
3750 		tree_id1 = got_object_id_dup(
3751 		    got_object_commit_get_tree_id(pcommit));
3752 		if (tree_id1 == NULL) {
3753 			got_object_commit_close(pcommit);
3754 			return got_error_from_errno("got_object_id_dup");
3755 		}
3756 		got_object_commit_close(pcommit);
3757 
3758 	}
3759 
3760 	if (tree_id1) {
3761 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
3762 		if (err)
3763 			goto done;
3764 	}
3765 
3766 	tree_id2 = got_object_commit_get_tree_id(commit);
3767 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
3768 	if (err)
3769 		goto done;
3770 
3771 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
3772 	    got_diff_tree_collect_changed_paths, paths, 0);
3773 done:
3774 	if (tree1)
3775 		got_object_tree_close(tree1);
3776 	if (tree2)
3777 		got_object_tree_close(tree2);
3778 	free(tree_id1);
3779 	return err;
3780 }
3781 
3782 static const struct got_error *
3783 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
3784 {
3785 	off_t *p;
3786 
3787 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
3788 	if (p == NULL)
3789 		return got_error_from_errno("reallocarray");
3790 	*line_offsets = p;
3791 	(*line_offsets)[*nlines] = off;
3792 	(*nlines)++;
3793 	return NULL;
3794 }
3795 
3796 static const struct got_error *
3797 write_commit_info(off_t **line_offsets, size_t *nlines,
3798     struct got_object_id *commit_id, struct got_reflist_head *refs,
3799     struct got_repository *repo, FILE *outfile)
3800 {
3801 	const struct got_error *err = NULL;
3802 	char datebuf[26], *datestr;
3803 	struct got_commit_object *commit;
3804 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
3805 	time_t committer_time;
3806 	const char *author, *committer;
3807 	char *refs_str = NULL;
3808 	struct got_pathlist_head changed_paths;
3809 	struct got_pathlist_entry *pe;
3810 	off_t outoff = 0;
3811 	int n;
3812 
3813 	TAILQ_INIT(&changed_paths);
3814 
3815 	if (refs) {
3816 		err = build_refs_str(&refs_str, refs, commit_id, repo);
3817 		if (err)
3818 			return err;
3819 	}
3820 
3821 	err = got_object_open_as_commit(&commit, repo, commit_id);
3822 	if (err)
3823 		return err;
3824 
3825 	err = got_object_id_str(&id_str, commit_id);
3826 	if (err) {
3827 		err = got_error_from_errno("got_object_id_str");
3828 		goto done;
3829 	}
3830 
3831 	err = add_line_offset(line_offsets, nlines, 0);
3832 	if (err)
3833 		goto done;
3834 
3835 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
3836 	    refs_str ? refs_str : "", refs_str ? ")" : "");
3837 	if (n < 0) {
3838 		err = got_error_from_errno("fprintf");
3839 		goto done;
3840 	}
3841 	outoff += n;
3842 	err = add_line_offset(line_offsets, nlines, outoff);
3843 	if (err)
3844 		goto done;
3845 
3846 	n = fprintf(outfile, "from: %s\n",
3847 	    got_object_commit_get_author(commit));
3848 	if (n < 0) {
3849 		err = got_error_from_errno("fprintf");
3850 		goto done;
3851 	}
3852 	outoff += n;
3853 	err = add_line_offset(line_offsets, nlines, outoff);
3854 	if (err)
3855 		goto done;
3856 
3857 	committer_time = got_object_commit_get_committer_time(commit);
3858 	datestr = get_datestr(&committer_time, datebuf);
3859 	if (datestr) {
3860 		n = fprintf(outfile, "date: %s UTC\n", datestr);
3861 		if (n < 0) {
3862 			err = got_error_from_errno("fprintf");
3863 			goto done;
3864 		}
3865 		outoff += n;
3866 		err = add_line_offset(line_offsets, nlines, outoff);
3867 		if (err)
3868 			goto done;
3869 	}
3870 	author = got_object_commit_get_author(commit);
3871 	committer = got_object_commit_get_committer(commit);
3872 	if (strcmp(author, committer) != 0) {
3873 		n = fprintf(outfile, "via: %s\n", committer);
3874 		if (n < 0) {
3875 			err = got_error_from_errno("fprintf");
3876 			goto done;
3877 		}
3878 		outoff += n;
3879 		err = add_line_offset(line_offsets, nlines, outoff);
3880 		if (err)
3881 			goto done;
3882 	}
3883 	if (got_object_commit_get_nparents(commit) > 1) {
3884 		const struct got_object_id_queue *parent_ids;
3885 		struct got_object_qid *qid;
3886 		int pn = 1;
3887 		parent_ids = got_object_commit_get_parent_ids(commit);
3888 		STAILQ_FOREACH(qid, parent_ids, entry) {
3889 			err = got_object_id_str(&id_str, &qid->id);
3890 			if (err)
3891 				goto done;
3892 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
3893 			if (n < 0) {
3894 				err = got_error_from_errno("fprintf");
3895 				goto done;
3896 			}
3897 			outoff += n;
3898 			err = add_line_offset(line_offsets, nlines, outoff);
3899 			if (err)
3900 				goto done;
3901 			free(id_str);
3902 			id_str = NULL;
3903 		}
3904 	}
3905 
3906 	err = got_object_commit_get_logmsg(&logmsg, commit);
3907 	if (err)
3908 		goto done;
3909 	s = logmsg;
3910 	while ((line = strsep(&s, "\n")) != NULL) {
3911 		n = fprintf(outfile, "%s\n", line);
3912 		if (n < 0) {
3913 			err = got_error_from_errno("fprintf");
3914 			goto done;
3915 		}
3916 		outoff += n;
3917 		err = add_line_offset(line_offsets, nlines, outoff);
3918 		if (err)
3919 			goto done;
3920 	}
3921 
3922 	err = get_changed_paths(&changed_paths, commit, repo);
3923 	if (err)
3924 		goto done;
3925 	TAILQ_FOREACH(pe, &changed_paths, entry) {
3926 		struct got_diff_changed_path *cp = pe->data;
3927 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
3928 		if (n < 0) {
3929 			err = got_error_from_errno("fprintf");
3930 			goto done;
3931 		}
3932 		outoff += n;
3933 		err = add_line_offset(line_offsets, nlines, outoff);
3934 		if (err)
3935 			goto done;
3936 		free((char *)pe->path);
3937 		free(pe->data);
3938 	}
3939 
3940 	fputc('\n', outfile);
3941 	outoff++;
3942 	err = add_line_offset(line_offsets, nlines, outoff);
3943 done:
3944 	got_pathlist_free(&changed_paths);
3945 	free(id_str);
3946 	free(logmsg);
3947 	free(refs_str);
3948 	got_object_commit_close(commit);
3949 	if (err) {
3950 		free(*line_offsets);
3951 		*line_offsets = NULL;
3952 		*nlines = 0;
3953 	}
3954 	return err;
3955 }
3956 
3957 static const struct got_error *
3958 create_diff(struct tog_diff_view_state *s)
3959 {
3960 	const struct got_error *err = NULL;
3961 	FILE *f = NULL;
3962 	int obj_type;
3963 
3964 	free(s->line_offsets);
3965 	s->line_offsets = malloc(sizeof(off_t));
3966 	if (s->line_offsets == NULL)
3967 		return got_error_from_errno("malloc");
3968 	s->nlines = 0;
3969 
3970 	f = got_opentemp();
3971 	if (f == NULL) {
3972 		err = got_error_from_errno("got_opentemp");
3973 		goto done;
3974 	}
3975 	if (s->f && fclose(s->f) == EOF) {
3976 		err = got_error_from_errno("fclose");
3977 		goto done;
3978 	}
3979 	s->f = f;
3980 
3981 	if (s->id1)
3982 		err = got_object_get_type(&obj_type, s->repo, s->id1);
3983 	else
3984 		err = got_object_get_type(&obj_type, s->repo, s->id2);
3985 	if (err)
3986 		goto done;
3987 
3988 	switch (obj_type) {
3989 	case GOT_OBJ_TYPE_BLOB:
3990 		err = got_diff_objects_as_blobs(&s->line_offsets, &s->nlines,
3991 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
3992 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
3993 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
3994 		break;
3995 	case GOT_OBJ_TYPE_TREE:
3996 		err = got_diff_objects_as_trees(&s->line_offsets, &s->nlines,
3997 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
3998 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
3999 		    s->force_text_diff, s->repo, s->f);
4000 		break;
4001 	case GOT_OBJ_TYPE_COMMIT: {
4002 		const struct got_object_id_queue *parent_ids;
4003 		struct got_object_qid *pid;
4004 		struct got_commit_object *commit2;
4005 		struct got_reflist_head *refs;
4006 
4007 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4008 		if (err)
4009 			goto done;
4010 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4011 		/* Show commit info if we're diffing to a parent/root commit. */
4012 		if (s->id1 == NULL) {
4013 			err = write_commit_info(&s->line_offsets, &s->nlines,
4014 			    s->id2, refs, s->repo, s->f);
4015 			if (err)
4016 				goto done;
4017 		} else {
4018 			parent_ids = got_object_commit_get_parent_ids(commit2);
4019 			STAILQ_FOREACH(pid, parent_ids, entry) {
4020 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4021 					err = write_commit_info(
4022 					    &s->line_offsets, &s->nlines,
4023 					    s->id2, refs, s->repo, s->f);
4024 					if (err)
4025 						goto done;
4026 					break;
4027 				}
4028 			}
4029 		}
4030 		got_object_commit_close(commit2);
4031 
4032 		err = got_diff_objects_as_commits(&s->line_offsets, &s->nlines,
4033 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4034 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4035 		    s->force_text_diff, s->repo, s->f);
4036 		break;
4037 	}
4038 	default:
4039 		err = got_error(GOT_ERR_OBJ_TYPE);
4040 		break;
4041 	}
4042 	if (err)
4043 		goto done;
4044 done:
4045 	if (s->f && fflush(s->f) != 0 && err == NULL)
4046 		err = got_error_from_errno("fflush");
4047 	return err;
4048 }
4049 
4050 static void
4051 diff_view_indicate_progress(struct tog_view *view)
4052 {
4053 	mvwaddstr(view->window, 0, 0, "diffing...");
4054 	update_panels();
4055 	doupdate();
4056 }
4057 
4058 static const struct got_error *
4059 search_start_diff_view(struct tog_view *view)
4060 {
4061 	struct tog_diff_view_state *s = &view->state.diff;
4062 
4063 	s->matched_line = 0;
4064 	return NULL;
4065 }
4066 
4067 static const struct got_error *
4068 search_next_diff_view(struct tog_view *view)
4069 {
4070 	struct tog_diff_view_state *s = &view->state.diff;
4071 	const struct got_error *err = NULL;
4072 	int lineno;
4073 	char *line = NULL;
4074 	size_t linesize = 0;
4075 	ssize_t linelen;
4076 
4077 	if (!view->searching) {
4078 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4079 		return NULL;
4080 	}
4081 
4082 	if (s->matched_line) {
4083 		if (view->searching == TOG_SEARCH_FORWARD)
4084 			lineno = s->matched_line + 1;
4085 		else
4086 			lineno = s->matched_line - 1;
4087 	} else
4088 		lineno = s->first_displayed_line;
4089 
4090 	while (1) {
4091 		off_t offset;
4092 
4093 		if (lineno <= 0 || lineno > s->nlines) {
4094 			if (s->matched_line == 0) {
4095 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4096 				break;
4097 			}
4098 
4099 			if (view->searching == TOG_SEARCH_FORWARD)
4100 				lineno = 1;
4101 			else
4102 				lineno = s->nlines;
4103 		}
4104 
4105 		offset = s->line_offsets[lineno - 1];
4106 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4107 			free(line);
4108 			return got_error_from_errno("fseeko");
4109 		}
4110 		linelen = getline(&line, &linesize, s->f);
4111 		if (linelen != -1) {
4112 			char *exstr;
4113 			err = expand_tab(&exstr, line);
4114 			if (err)
4115 				break;
4116 			if (match_line(exstr, &view->regex, 1,
4117 			    &view->regmatch)) {
4118 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4119 				s->matched_line = lineno;
4120 				free(exstr);
4121 				break;
4122 			}
4123 			free(exstr);
4124 		}
4125 		if (view->searching == TOG_SEARCH_FORWARD)
4126 			lineno++;
4127 		else
4128 			lineno--;
4129 	}
4130 	free(line);
4131 
4132 	if (s->matched_line) {
4133 		s->first_displayed_line = s->matched_line;
4134 		s->selected_line = 1;
4135 	}
4136 
4137 	return err;
4138 }
4139 
4140 static const struct got_error *
4141 close_diff_view(struct tog_view *view)
4142 {
4143 	const struct got_error *err = NULL;
4144 	struct tog_diff_view_state *s = &view->state.diff;
4145 
4146 	free(s->id1);
4147 	s->id1 = NULL;
4148 	free(s->id2);
4149 	s->id2 = NULL;
4150 	if (s->f && fclose(s->f) == EOF)
4151 		err = got_error_from_errno("fclose");
4152 	s->f = NULL;
4153 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4154 		err = got_error_from_errno("fclose");
4155 	s->f1 = NULL;
4156 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4157 		err = got_error_from_errno("fclose");
4158 	s->f2 = NULL;
4159 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4160 		err = got_error_from_errno("close");
4161 	s->fd1 = -1;
4162 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4163 		err = got_error_from_errno("close");
4164 	s->fd2 = -1;
4165 	free_colors(&s->colors);
4166 	free(s->line_offsets);
4167 	s->line_offsets = NULL;
4168 	s->nlines = 0;
4169 	return err;
4170 }
4171 
4172 static const struct got_error *
4173 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4174     struct got_object_id *id2, const char *label1, const char *label2,
4175     int diff_context, int ignore_whitespace, int force_text_diff,
4176     struct tog_view *log_view, struct got_repository *repo)
4177 {
4178 	const struct got_error *err;
4179 	struct tog_diff_view_state *s = &view->state.diff;
4180 
4181 	memset(s, 0, sizeof(*s));
4182 	s->fd1 = -1;
4183 	s->fd2 = -1;
4184 
4185 	if (id1 != NULL && id2 != NULL) {
4186 	    int type1, type2;
4187 	    err = got_object_get_type(&type1, repo, id1);
4188 	    if (err)
4189 		return err;
4190 	    err = got_object_get_type(&type2, repo, id2);
4191 	    if (err)
4192 		return err;
4193 
4194 	    if (type1 != type2)
4195 		return got_error(GOT_ERR_OBJ_TYPE);
4196 	}
4197 	s->first_displayed_line = 1;
4198 	s->last_displayed_line = view->nlines;
4199 	s->selected_line = 1;
4200 	s->repo = repo;
4201 	s->id1 = id1;
4202 	s->id2 = id2;
4203 	s->label1 = label1;
4204 	s->label2 = label2;
4205 
4206 	if (id1) {
4207 		s->id1 = got_object_id_dup(id1);
4208 		if (s->id1 == NULL)
4209 			return got_error_from_errno("got_object_id_dup");
4210 	} else
4211 		s->id1 = NULL;
4212 
4213 	s->id2 = got_object_id_dup(id2);
4214 	if (s->id2 == NULL) {
4215 		err = got_error_from_errno("got_object_id_dup");
4216 		goto done;
4217 	}
4218 
4219 	s->f1 = got_opentemp();
4220 	if (s->f1 == NULL) {
4221 		err = got_error_from_errno("got_opentemp");
4222 		goto done;
4223 	}
4224 
4225 	s->f2 = got_opentemp();
4226 	if (s->f2 == NULL) {
4227 		err = got_error_from_errno("got_opentemp");
4228 		goto done;
4229 	}
4230 
4231 	s->fd1 = got_opentempfd();
4232 	if (s->fd1 == -1) {
4233 		err = got_error_from_errno("got_opentempfd");
4234 		goto done;
4235 	}
4236 
4237 	s->fd2 = got_opentempfd();
4238 	if (s->fd2 == -1) {
4239 		err = got_error_from_errno("got_opentempfd");
4240 		goto done;
4241 	}
4242 
4243 	s->first_displayed_line = 1;
4244 	s->last_displayed_line = view->nlines;
4245 	s->diff_context = diff_context;
4246 	s->ignore_whitespace = ignore_whitespace;
4247 	s->force_text_diff = force_text_diff;
4248 	s->log_view = log_view;
4249 	s->repo = repo;
4250 
4251 	STAILQ_INIT(&s->colors);
4252 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4253 		err = add_color(&s->colors,
4254 		    "^-", TOG_COLOR_DIFF_MINUS,
4255 		    get_color_value("TOG_COLOR_DIFF_MINUS"));
4256 		if (err)
4257 			goto done;
4258 		err = add_color(&s->colors, "^\\+",
4259 		    TOG_COLOR_DIFF_PLUS,
4260 		    get_color_value("TOG_COLOR_DIFF_PLUS"));
4261 		if (err)
4262 			goto done;
4263 		err = add_color(&s->colors,
4264 		    "^@@", TOG_COLOR_DIFF_CHUNK_HEADER,
4265 		    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"));
4266 		if (err)
4267 			goto done;
4268 
4269 		err = add_color(&s->colors,
4270 		    "^(commit [0-9a-f]|parent [0-9]|"
4271 		    "(blob|file|tree|commit) [-+] |"
4272 		    "[MDmA]  [^ ])", TOG_COLOR_DIFF_META,
4273 		    get_color_value("TOG_COLOR_DIFF_META"));
4274 		if (err)
4275 			goto done;
4276 
4277 		err = add_color(&s->colors,
4278 		    "^(from|via): ", TOG_COLOR_AUTHOR,
4279 		    get_color_value("TOG_COLOR_AUTHOR"));
4280 		if (err)
4281 			goto done;
4282 
4283 		err = add_color(&s->colors,
4284 		    "^date: ", TOG_COLOR_DATE,
4285 		    get_color_value("TOG_COLOR_DATE"));
4286 		if (err)
4287 			goto done;
4288 	}
4289 
4290 	if (log_view && view_is_splitscreen(view))
4291 		show_log_view(log_view); /* draw vborder */
4292 	diff_view_indicate_progress(view);
4293 
4294 	err = create_diff(s);
4295 
4296 	view->show = show_diff_view;
4297 	view->input = input_diff_view;
4298 	view->reset = reset_diff_view;
4299 	view->close = close_diff_view;
4300 	view->search_start = search_start_diff_view;
4301 	view->search_next = search_next_diff_view;
4302 done:
4303 	if (err)
4304 		close_diff_view(view);
4305 	return err;
4306 }
4307 
4308 static const struct got_error *
4309 show_diff_view(struct tog_view *view)
4310 {
4311 	const struct got_error *err;
4312 	struct tog_diff_view_state *s = &view->state.diff;
4313 	char *id_str1 = NULL, *id_str2, *header;
4314 	const char *label1, *label2;
4315 
4316 	if (s->id1) {
4317 		err = got_object_id_str(&id_str1, s->id1);
4318 		if (err)
4319 			return err;
4320 		label1 = s->label1 ? : id_str1;
4321 	} else
4322 		label1 = "/dev/null";
4323 
4324 	err = got_object_id_str(&id_str2, s->id2);
4325 	if (err)
4326 		return err;
4327 	label2 = s->label2 ? : id_str2;
4328 
4329 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4330 		err = got_error_from_errno("asprintf");
4331 		free(id_str1);
4332 		free(id_str2);
4333 		return err;
4334 	}
4335 	free(id_str1);
4336 	free(id_str2);
4337 
4338 	err = draw_file(view, header);
4339 	free(header);
4340 	return err;
4341 }
4342 
4343 static const struct got_error *
4344 set_selected_commit(struct tog_diff_view_state *s,
4345     struct commit_queue_entry *entry)
4346 {
4347 	const struct got_error *err;
4348 	const struct got_object_id_queue *parent_ids;
4349 	struct got_commit_object *selected_commit;
4350 	struct got_object_qid *pid;
4351 
4352 	free(s->id2);
4353 	s->id2 = got_object_id_dup(entry->id);
4354 	if (s->id2 == NULL)
4355 		return got_error_from_errno("got_object_id_dup");
4356 
4357 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4358 	if (err)
4359 		return err;
4360 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4361 	free(s->id1);
4362 	pid = STAILQ_FIRST(parent_ids);
4363 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4364 	got_object_commit_close(selected_commit);
4365 	return NULL;
4366 }
4367 
4368 static const struct got_error *
4369 reset_diff_view(struct tog_view *view)
4370 {
4371 	struct tog_diff_view_state *s = &view->state.diff;
4372 
4373 	view->count = 0;
4374 	wclear(view->window);
4375 	s->first_displayed_line = 1;
4376 	s->last_displayed_line = view->nlines;
4377 	s->matched_line = 0;
4378 	diff_view_indicate_progress(view);
4379 	return create_diff(s);
4380 }
4381 
4382 static const struct got_error *
4383 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4384 {
4385 	const struct got_error *err = NULL;
4386 	struct tog_diff_view_state *s = &view->state.diff;
4387 	struct tog_log_view_state *ls;
4388 	struct commit_queue_entry *old_selected_entry;
4389 	char *line = NULL;
4390 	size_t linesize = 0;
4391 	ssize_t linelen;
4392 	int i, nscroll = view->nlines - 1;
4393 
4394 	switch (ch) {
4395 	case '0':
4396 		view->x = 0;
4397 		break;
4398 	case '$':
4399 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4400 		view->count = 0;
4401 		break;
4402 	case KEY_RIGHT:
4403 	case 'l':
4404 		if (view->x + view->ncols / 3 < view->maxx)
4405 			view->x += 2;  /* move two columns right */
4406 		else
4407 			view->count = 0;
4408 		break;
4409 	case KEY_LEFT:
4410 	case 'h':
4411 		view->x -= MIN(view->x, 2);  /* move two columns back */
4412 		if (view->x <= 0)
4413 			view->count = 0;
4414 		break;
4415 	case 'a':
4416 	case 'w':
4417 		if (ch == 'a')
4418 			s->force_text_diff = !s->force_text_diff;
4419 		if (ch == 'w')
4420 			s->ignore_whitespace = !s->ignore_whitespace;
4421 		err = reset_diff_view(view);
4422 		break;
4423 	case 'g':
4424 	case KEY_HOME:
4425 		s->first_displayed_line = 1;
4426 		view->count = 0;
4427 		break;
4428 	case 'G':
4429 	case KEY_END:
4430 		view->count = 0;
4431 		if (s->eof)
4432 			break;
4433 
4434 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4435 		s->eof = 1;
4436 		break;
4437 	case 'k':
4438 	case KEY_UP:
4439 	case CTRL('p'):
4440 		if (s->first_displayed_line > 1)
4441 			s->first_displayed_line--;
4442 		else
4443 			view->count = 0;
4444 		break;
4445 	case CTRL('u'):
4446 	case 'u':
4447 		nscroll /= 2;
4448 		/* FALL THROUGH */
4449 	case KEY_PPAGE:
4450 	case CTRL('b'):
4451 	case 'b':
4452 		if (s->first_displayed_line == 1) {
4453 			view->count = 0;
4454 			break;
4455 		}
4456 		i = 0;
4457 		while (i++ < nscroll && s->first_displayed_line > 1)
4458 			s->first_displayed_line--;
4459 		break;
4460 	case 'j':
4461 	case KEY_DOWN:
4462 	case CTRL('n'):
4463 		if (!s->eof)
4464 			s->first_displayed_line++;
4465 		else
4466 			view->count = 0;
4467 		break;
4468 	case CTRL('d'):
4469 	case 'd':
4470 		nscroll /= 2;
4471 		/* FALL THROUGH */
4472 	case KEY_NPAGE:
4473 	case CTRL('f'):
4474 	case 'f':
4475 	case ' ':
4476 		if (s->eof) {
4477 			view->count = 0;
4478 			break;
4479 		}
4480 		i = 0;
4481 		while (!s->eof && i++ < nscroll) {
4482 			linelen = getline(&line, &linesize, s->f);
4483 			s->first_displayed_line++;
4484 			if (linelen == -1) {
4485 				if (feof(s->f)) {
4486 					s->eof = 1;
4487 				} else
4488 					err = got_ferror(s->f, GOT_ERR_IO);
4489 				break;
4490 			}
4491 		}
4492 		free(line);
4493 		break;
4494 	case '[':
4495 		if (s->diff_context > 0) {
4496 			s->diff_context--;
4497 			s->matched_line = 0;
4498 			diff_view_indicate_progress(view);
4499 			err = create_diff(s);
4500 			if (s->first_displayed_line + view->nlines - 1 >
4501 			    s->nlines) {
4502 				s->first_displayed_line = 1;
4503 				s->last_displayed_line = view->nlines;
4504 			}
4505 		} else
4506 			view->count = 0;
4507 		break;
4508 	case ']':
4509 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4510 			s->diff_context++;
4511 			s->matched_line = 0;
4512 			diff_view_indicate_progress(view);
4513 			err = create_diff(s);
4514 		} else
4515 			view->count = 0;
4516 		break;
4517 	case '<':
4518 	case ',':
4519 		if (s->log_view == NULL) {
4520 			view->count = 0;
4521 			break;
4522 		}
4523 		ls = &s->log_view->state.log;
4524 		old_selected_entry = ls->selected_entry;
4525 
4526 		/* view->count handled in input_log_view() */
4527 		err = input_log_view(NULL, s->log_view, KEY_UP);
4528 		if (err)
4529 			break;
4530 
4531 		if (old_selected_entry == ls->selected_entry)
4532 			break;
4533 
4534 		err = set_selected_commit(s, ls->selected_entry);
4535 		if (err)
4536 			break;
4537 
4538 		s->first_displayed_line = 1;
4539 		s->last_displayed_line = view->nlines;
4540 		s->matched_line = 0;
4541 		view->x = 0;
4542 
4543 		diff_view_indicate_progress(view);
4544 		err = create_diff(s);
4545 		break;
4546 	case '>':
4547 	case '.':
4548 		if (s->log_view == NULL) {
4549 			view->count = 0;
4550 			break;
4551 		}
4552 		ls = &s->log_view->state.log;
4553 		old_selected_entry = ls->selected_entry;
4554 
4555 		/* view->count handled in input_log_view() */
4556 		err = input_log_view(NULL, s->log_view, KEY_DOWN);
4557 		if (err)
4558 			break;
4559 
4560 		if (old_selected_entry == ls->selected_entry)
4561 			break;
4562 
4563 		err = set_selected_commit(s, ls->selected_entry);
4564 		if (err)
4565 			break;
4566 
4567 		s->first_displayed_line = 1;
4568 		s->last_displayed_line = view->nlines;
4569 		s->matched_line = 0;
4570 		view->x = 0;
4571 
4572 		diff_view_indicate_progress(view);
4573 		err = create_diff(s);
4574 		break;
4575 	default:
4576 		view->count = 0;
4577 		break;
4578 	}
4579 
4580 	return err;
4581 }
4582 
4583 static const struct got_error *
4584 cmd_diff(int argc, char *argv[])
4585 {
4586 	const struct got_error *error = NULL;
4587 	struct got_repository *repo = NULL;
4588 	struct got_worktree *worktree = NULL;
4589 	struct got_object_id *id1 = NULL, *id2 = NULL;
4590 	char *repo_path = NULL, *cwd = NULL;
4591 	char *id_str1 = NULL, *id_str2 = NULL;
4592 	char *label1 = NULL, *label2 = NULL;
4593 	int diff_context = 3, ignore_whitespace = 0;
4594 	int ch, force_text_diff = 0;
4595 	const char *errstr;
4596 	struct tog_view *view;
4597 	int *pack_fds = NULL;
4598 
4599 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
4600 		switch (ch) {
4601 		case 'a':
4602 			force_text_diff = 1;
4603 			break;
4604 		case 'C':
4605 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
4606 			    &errstr);
4607 			if (errstr != NULL)
4608 				errx(1, "number of context lines is %s: %s",
4609 				    errstr, errstr);
4610 			break;
4611 		case 'r':
4612 			repo_path = realpath(optarg, NULL);
4613 			if (repo_path == NULL)
4614 				return got_error_from_errno2("realpath",
4615 				    optarg);
4616 			got_path_strip_trailing_slashes(repo_path);
4617 			break;
4618 		case 'w':
4619 			ignore_whitespace = 1;
4620 			break;
4621 		default:
4622 			usage_diff();
4623 			/* NOTREACHED */
4624 		}
4625 	}
4626 
4627 	argc -= optind;
4628 	argv += optind;
4629 
4630 	if (argc == 0) {
4631 		usage_diff(); /* TODO show local worktree changes */
4632 	} else if (argc == 2) {
4633 		id_str1 = argv[0];
4634 		id_str2 = argv[1];
4635 	} else
4636 		usage_diff();
4637 
4638 	error = got_repo_pack_fds_open(&pack_fds);
4639 	if (error)
4640 		goto done;
4641 
4642 	if (repo_path == NULL) {
4643 		cwd = getcwd(NULL, 0);
4644 		if (cwd == NULL)
4645 			return got_error_from_errno("getcwd");
4646 		error = got_worktree_open(&worktree, cwd);
4647 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4648 			goto done;
4649 		if (worktree)
4650 			repo_path =
4651 			    strdup(got_worktree_get_repo_path(worktree));
4652 		else
4653 			repo_path = strdup(cwd);
4654 		if (repo_path == NULL) {
4655 			error = got_error_from_errno("strdup");
4656 			goto done;
4657 		}
4658 	}
4659 
4660 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4661 	if (error)
4662 		goto done;
4663 
4664 	init_curses();
4665 
4666 	error = apply_unveil(got_repo_get_path(repo), NULL);
4667 	if (error)
4668 		goto done;
4669 
4670 	error = tog_load_refs(repo, 0);
4671 	if (error)
4672 		goto done;
4673 
4674 	error = got_repo_match_object_id(&id1, &label1, id_str1,
4675 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4676 	if (error)
4677 		goto done;
4678 
4679 	error = got_repo_match_object_id(&id2, &label2, id_str2,
4680 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
4681 	if (error)
4682 		goto done;
4683 
4684 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
4685 	if (view == NULL) {
4686 		error = got_error_from_errno("view_open");
4687 		goto done;
4688 	}
4689 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
4690 	    ignore_whitespace, force_text_diff, NULL,  repo);
4691 	if (error)
4692 		goto done;
4693 	error = view_loop(view);
4694 done:
4695 	free(label1);
4696 	free(label2);
4697 	free(repo_path);
4698 	free(cwd);
4699 	if (repo) {
4700 		const struct got_error *close_err = got_repo_close(repo);
4701 		if (error == NULL)
4702 			error = close_err;
4703 	}
4704 	if (worktree)
4705 		got_worktree_close(worktree);
4706 	if (pack_fds) {
4707 		const struct got_error *pack_err =
4708 		    got_repo_pack_fds_close(pack_fds);
4709 		if (error == NULL)
4710 			error = pack_err;
4711 	}
4712 	tog_free_refs();
4713 	return error;
4714 }
4715 
4716 __dead static void
4717 usage_blame(void)
4718 {
4719 	endwin();
4720 	fprintf(stderr,
4721 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
4722 	    getprogname());
4723 	exit(1);
4724 }
4725 
4726 struct tog_blame_line {
4727 	int annotated;
4728 	struct got_object_id *id;
4729 };
4730 
4731 static const struct got_error *
4732 draw_blame(struct tog_view *view)
4733 {
4734 	struct tog_blame_view_state *s = &view->state.blame;
4735 	struct tog_blame *blame = &s->blame;
4736 	regmatch_t *regmatch = &view->regmatch;
4737 	const struct got_error *err;
4738 	int lineno = 0, nprinted = 0;
4739 	char *line = NULL;
4740 	size_t linesize = 0;
4741 	ssize_t linelen;
4742 	wchar_t *wline;
4743 	int width;
4744 	struct tog_blame_line *blame_line;
4745 	struct got_object_id *prev_id = NULL;
4746 	char *id_str;
4747 	struct tog_color *tc;
4748 
4749 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
4750 	if (err)
4751 		return err;
4752 
4753 	rewind(blame->f);
4754 	werase(view->window);
4755 
4756 	if (asprintf(&line, "commit %s", id_str) == -1) {
4757 		err = got_error_from_errno("asprintf");
4758 		free(id_str);
4759 		return err;
4760 	}
4761 
4762 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4763 	free(line);
4764 	line = NULL;
4765 	if (err)
4766 		return err;
4767 	if (view_needs_focus_indication(view))
4768 		wstandout(view->window);
4769 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4770 	if (tc)
4771 		wattr_on(view->window,
4772 		    COLOR_PAIR(tc->colorpair), NULL);
4773 	waddwstr(view->window, wline);
4774 	if (tc)
4775 		wattr_off(view->window,
4776 		    COLOR_PAIR(tc->colorpair), NULL);
4777 	if (view_needs_focus_indication(view))
4778 		wstandend(view->window);
4779 	free(wline);
4780 	wline = NULL;
4781 	if (width < view->ncols - 1)
4782 		waddch(view->window, '\n');
4783 
4784 	if (asprintf(&line, "[%d/%d] %s%s",
4785 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
4786 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
4787 		free(id_str);
4788 		return got_error_from_errno("asprintf");
4789 	}
4790 	free(id_str);
4791 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
4792 	free(line);
4793 	line = NULL;
4794 	if (err)
4795 		return err;
4796 	waddwstr(view->window, wline);
4797 	free(wline);
4798 	wline = NULL;
4799 	if (width < view->ncols - 1)
4800 		waddch(view->window, '\n');
4801 
4802 	s->eof = 0;
4803 	view->maxx = 0;
4804 	while (nprinted < view->nlines - 2) {
4805 		linelen = getline(&line, &linesize, blame->f);
4806 		if (linelen == -1) {
4807 			if (feof(blame->f)) {
4808 				s->eof = 1;
4809 				break;
4810 			}
4811 			free(line);
4812 			return got_ferror(blame->f, GOT_ERR_IO);
4813 		}
4814 		if (++lineno < s->first_displayed_line)
4815 			continue;
4816 
4817 		/* Set view->maxx based on full line length. */
4818 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
4819 		if (err) {
4820 			free(line);
4821 			return err;
4822 		}
4823 		free(wline);
4824 		wline = NULL;
4825 		view->maxx = MAX(view->maxx, width);
4826 
4827 		if (view->focussed && nprinted == s->selected_line - 1)
4828 			wstandout(view->window);
4829 
4830 		if (blame->nlines > 0) {
4831 			blame_line = &blame->lines[lineno - 1];
4832 			if (blame_line->annotated && prev_id &&
4833 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
4834 			    !(view->focussed &&
4835 			    nprinted == s->selected_line - 1)) {
4836 				waddstr(view->window, "        ");
4837 			} else if (blame_line->annotated) {
4838 				char *id_str;
4839 				err = got_object_id_str(&id_str,
4840 				    blame_line->id);
4841 				if (err) {
4842 					free(line);
4843 					return err;
4844 				}
4845 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
4846 				if (tc)
4847 					wattr_on(view->window,
4848 					    COLOR_PAIR(tc->colorpair), NULL);
4849 				wprintw(view->window, "%.8s", id_str);
4850 				if (tc)
4851 					wattr_off(view->window,
4852 					    COLOR_PAIR(tc->colorpair), NULL);
4853 				free(id_str);
4854 				prev_id = blame_line->id;
4855 			} else {
4856 				waddstr(view->window, "........");
4857 				prev_id = NULL;
4858 			}
4859 		} else {
4860 			waddstr(view->window, "........");
4861 			prev_id = NULL;
4862 		}
4863 
4864 		if (view->focussed && nprinted == s->selected_line - 1)
4865 			wstandend(view->window);
4866 		waddstr(view->window, " ");
4867 
4868 		if (view->ncols <= 9) {
4869 			width = 9;
4870 		} else if (s->first_displayed_line + nprinted ==
4871 		    s->matched_line &&
4872 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4873 			err = add_matched_line(&width, line, view->ncols - 9, 9,
4874 			    view->window, view->x, regmatch);
4875 			if (err) {
4876 				free(line);
4877 				return err;
4878 			}
4879 			width += 9;
4880 		} else {
4881 			int skip;
4882 			err = format_line(&wline, &width, &skip, line,
4883 			    view->x, view->ncols - 9, 9, 1);
4884 			if (err) {
4885 				free(line);
4886 				return err;
4887 			}
4888 			waddwstr(view->window, &wline[skip]);
4889 			width += 9;
4890 			free(wline);
4891 			wline = NULL;
4892 		}
4893 
4894 		if (width <= view->ncols - 1)
4895 			waddch(view->window, '\n');
4896 		if (++nprinted == 1)
4897 			s->first_displayed_line = lineno;
4898 	}
4899 	free(line);
4900 	s->last_displayed_line = lineno;
4901 
4902 	view_border(view);
4903 
4904 	return NULL;
4905 }
4906 
4907 static const struct got_error *
4908 blame_cb(void *arg, int nlines, int lineno,
4909     struct got_commit_object *commit, struct got_object_id *id)
4910 {
4911 	const struct got_error *err = NULL;
4912 	struct tog_blame_cb_args *a = arg;
4913 	struct tog_blame_line *line;
4914 	int errcode;
4915 
4916 	if (nlines != a->nlines ||
4917 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
4918 		return got_error(GOT_ERR_RANGE);
4919 
4920 	errcode = pthread_mutex_lock(&tog_mutex);
4921 	if (errcode)
4922 		return got_error_set_errno(errcode, "pthread_mutex_lock");
4923 
4924 	if (*a->quit) {	/* user has quit the blame view */
4925 		err = got_error(GOT_ERR_ITER_COMPLETED);
4926 		goto done;
4927 	}
4928 
4929 	if (lineno == -1)
4930 		goto done; /* no change in this commit */
4931 
4932 	line = &a->lines[lineno - 1];
4933 	if (line->annotated)
4934 		goto done;
4935 
4936 	line->id = got_object_id_dup(id);
4937 	if (line->id == NULL) {
4938 		err = got_error_from_errno("got_object_id_dup");
4939 		goto done;
4940 	}
4941 	line->annotated = 1;
4942 done:
4943 	errcode = pthread_mutex_unlock(&tog_mutex);
4944 	if (errcode)
4945 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
4946 	return err;
4947 }
4948 
4949 static void *
4950 blame_thread(void *arg)
4951 {
4952 	const struct got_error *err, *close_err;
4953 	struct tog_blame_thread_args *ta = arg;
4954 	struct tog_blame_cb_args *a = ta->cb_args;
4955 	int errcode, fd1 = -1, fd2 = -1;
4956 	FILE *f1 = NULL, *f2 = NULL;
4957 
4958 	fd1 = got_opentempfd();
4959 	if (fd1 == -1)
4960 		return (void *)got_error_from_errno("got_opentempfd");
4961 
4962 	fd2 = got_opentempfd();
4963 	if (fd2 == -1) {
4964 		err = got_error_from_errno("got_opentempfd");
4965 		goto done;
4966 	}
4967 
4968 	f1 = got_opentemp();
4969 	if (f1 == NULL) {
4970 		err = (void *)got_error_from_errno("got_opentemp");
4971 		goto done;
4972 	}
4973 	f2 = got_opentemp();
4974 	if (f2 == NULL) {
4975 		err = (void *)got_error_from_errno("got_opentemp");
4976 		goto done;
4977 	}
4978 
4979 	err = block_signals_used_by_main_thread();
4980 	if (err)
4981 		goto done;
4982 
4983 	err = got_blame(ta->path, a->commit_id, ta->repo,
4984 	    tog_diff_algo, blame_cb, ta->cb_args,
4985 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
4986 	if (err && err->code == GOT_ERR_CANCELLED)
4987 		err = NULL;
4988 
4989 	errcode = pthread_mutex_lock(&tog_mutex);
4990 	if (errcode) {
4991 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
4992 		goto done;
4993 	}
4994 
4995 	close_err = got_repo_close(ta->repo);
4996 	if (err == NULL)
4997 		err = close_err;
4998 	ta->repo = NULL;
4999 	*ta->complete = 1;
5000 
5001 	errcode = pthread_mutex_unlock(&tog_mutex);
5002 	if (errcode && err == NULL)
5003 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5004 
5005 done:
5006 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5007 		err = got_error_from_errno("close");
5008 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5009 		err = got_error_from_errno("close");
5010 	if (f1 && fclose(f1) == EOF && err == NULL)
5011 		err = got_error_from_errno("fclose");
5012 	if (f2 && fclose(f2) == EOF && err == NULL)
5013 		err = got_error_from_errno("fclose");
5014 
5015 	return (void *)err;
5016 }
5017 
5018 static struct got_object_id *
5019 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5020     int first_displayed_line, int selected_line)
5021 {
5022 	struct tog_blame_line *line;
5023 
5024 	if (nlines <= 0)
5025 		return NULL;
5026 
5027 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5028 	if (!line->annotated)
5029 		return NULL;
5030 
5031 	return line->id;
5032 }
5033 
5034 static const struct got_error *
5035 stop_blame(struct tog_blame *blame)
5036 {
5037 	const struct got_error *err = NULL;
5038 	int i;
5039 
5040 	if (blame->thread) {
5041 		int errcode;
5042 		errcode = pthread_mutex_unlock(&tog_mutex);
5043 		if (errcode)
5044 			return got_error_set_errno(errcode,
5045 			    "pthread_mutex_unlock");
5046 		errcode = pthread_join(blame->thread, (void **)&err);
5047 		if (errcode)
5048 			return got_error_set_errno(errcode, "pthread_join");
5049 		errcode = pthread_mutex_lock(&tog_mutex);
5050 		if (errcode)
5051 			return got_error_set_errno(errcode,
5052 			    "pthread_mutex_lock");
5053 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5054 			err = NULL;
5055 		blame->thread = NULL;
5056 	}
5057 	if (blame->thread_args.repo) {
5058 		const struct got_error *close_err;
5059 		close_err = got_repo_close(blame->thread_args.repo);
5060 		if (err == NULL)
5061 			err = close_err;
5062 		blame->thread_args.repo = NULL;
5063 	}
5064 	if (blame->f) {
5065 		if (fclose(blame->f) == EOF && err == NULL)
5066 			err = got_error_from_errno("fclose");
5067 		blame->f = NULL;
5068 	}
5069 	if (blame->lines) {
5070 		for (i = 0; i < blame->nlines; i++)
5071 			free(blame->lines[i].id);
5072 		free(blame->lines);
5073 		blame->lines = NULL;
5074 	}
5075 	free(blame->cb_args.commit_id);
5076 	blame->cb_args.commit_id = NULL;
5077 	if (blame->pack_fds) {
5078 		const struct got_error *pack_err =
5079 		    got_repo_pack_fds_close(blame->pack_fds);
5080 		if (err == NULL)
5081 			err = pack_err;
5082 		blame->pack_fds = NULL;
5083 	}
5084 	return err;
5085 }
5086 
5087 static const struct got_error *
5088 cancel_blame_view(void *arg)
5089 {
5090 	const struct got_error *err = NULL;
5091 	int *done = arg;
5092 	int errcode;
5093 
5094 	errcode = pthread_mutex_lock(&tog_mutex);
5095 	if (errcode)
5096 		return got_error_set_errno(errcode,
5097 		    "pthread_mutex_unlock");
5098 
5099 	if (*done)
5100 		err = got_error(GOT_ERR_CANCELLED);
5101 
5102 	errcode = pthread_mutex_unlock(&tog_mutex);
5103 	if (errcode)
5104 		return got_error_set_errno(errcode,
5105 		    "pthread_mutex_lock");
5106 
5107 	return err;
5108 }
5109 
5110 static const struct got_error *
5111 run_blame(struct tog_view *view)
5112 {
5113 	struct tog_blame_view_state *s = &view->state.blame;
5114 	struct tog_blame *blame = &s->blame;
5115 	const struct got_error *err = NULL;
5116 	struct got_commit_object *commit = NULL;
5117 	struct got_blob_object *blob = NULL;
5118 	struct got_repository *thread_repo = NULL;
5119 	struct got_object_id *obj_id = NULL;
5120 	int obj_type, fd = -1;
5121 	int *pack_fds = NULL;
5122 
5123 	err = got_object_open_as_commit(&commit, s->repo,
5124 	    &s->blamed_commit->id);
5125 	if (err)
5126 		return err;
5127 
5128 	fd = got_opentempfd();
5129 	if (fd == -1) {
5130 		err = got_error_from_errno("got_opentempfd");
5131 		goto done;
5132 	}
5133 
5134 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5135 	if (err)
5136 		goto done;
5137 
5138 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5139 	if (err)
5140 		goto done;
5141 
5142 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5143 		err = got_error(GOT_ERR_OBJ_TYPE);
5144 		goto done;
5145 	}
5146 
5147 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5148 	if (err)
5149 		goto done;
5150 	blame->f = got_opentemp();
5151 	if (blame->f == NULL) {
5152 		err = got_error_from_errno("got_opentemp");
5153 		goto done;
5154 	}
5155 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5156 	    &blame->line_offsets, blame->f, blob);
5157 	if (err)
5158 		goto done;
5159 	if (blame->nlines == 0) {
5160 		s->blame_complete = 1;
5161 		goto done;
5162 	}
5163 
5164 	/* Don't include \n at EOF in the blame line count. */
5165 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5166 		blame->nlines--;
5167 
5168 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5169 	if (blame->lines == NULL) {
5170 		err = got_error_from_errno("calloc");
5171 		goto done;
5172 	}
5173 
5174 	err = got_repo_pack_fds_open(&pack_fds);
5175 	if (err)
5176 		goto done;
5177 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5178 	    pack_fds);
5179 	if (err)
5180 		goto done;
5181 
5182 	blame->pack_fds = pack_fds;
5183 	blame->cb_args.view = view;
5184 	blame->cb_args.lines = blame->lines;
5185 	blame->cb_args.nlines = blame->nlines;
5186 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5187 	if (blame->cb_args.commit_id == NULL) {
5188 		err = got_error_from_errno("got_object_id_dup");
5189 		goto done;
5190 	}
5191 	blame->cb_args.quit = &s->done;
5192 
5193 	blame->thread_args.path = s->path;
5194 	blame->thread_args.repo = thread_repo;
5195 	blame->thread_args.cb_args = &blame->cb_args;
5196 	blame->thread_args.complete = &s->blame_complete;
5197 	blame->thread_args.cancel_cb = cancel_blame_view;
5198 	blame->thread_args.cancel_arg = &s->done;
5199 	s->blame_complete = 0;
5200 
5201 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5202 		s->first_displayed_line = 1;
5203 		s->last_displayed_line = view->nlines;
5204 		s->selected_line = 1;
5205 	}
5206 	s->matched_line = 0;
5207 
5208 done:
5209 	if (commit)
5210 		got_object_commit_close(commit);
5211 	if (fd != -1 && close(fd) == -1 && err == NULL)
5212 		err = got_error_from_errno("close");
5213 	if (blob)
5214 		got_object_blob_close(blob);
5215 	free(obj_id);
5216 	if (err)
5217 		stop_blame(blame);
5218 	return err;
5219 }
5220 
5221 static const struct got_error *
5222 open_blame_view(struct tog_view *view, char *path,
5223     struct got_object_id *commit_id, struct got_repository *repo)
5224 {
5225 	const struct got_error *err = NULL;
5226 	struct tog_blame_view_state *s = &view->state.blame;
5227 
5228 	STAILQ_INIT(&s->blamed_commits);
5229 
5230 	s->path = strdup(path);
5231 	if (s->path == NULL)
5232 		return got_error_from_errno("strdup");
5233 
5234 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5235 	if (err) {
5236 		free(s->path);
5237 		return err;
5238 	}
5239 
5240 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5241 	s->first_displayed_line = 1;
5242 	s->last_displayed_line = view->nlines;
5243 	s->selected_line = 1;
5244 	s->blame_complete = 0;
5245 	s->repo = repo;
5246 	s->commit_id = commit_id;
5247 	memset(&s->blame, 0, sizeof(s->blame));
5248 
5249 	STAILQ_INIT(&s->colors);
5250 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5251 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5252 		    get_color_value("TOG_COLOR_COMMIT"));
5253 		if (err)
5254 			return err;
5255 	}
5256 
5257 	view->show = show_blame_view;
5258 	view->input = input_blame_view;
5259 	view->reset = reset_blame_view;
5260 	view->close = close_blame_view;
5261 	view->search_start = search_start_blame_view;
5262 	view->search_next = search_next_blame_view;
5263 
5264 	return run_blame(view);
5265 }
5266 
5267 static const struct got_error *
5268 close_blame_view(struct tog_view *view)
5269 {
5270 	const struct got_error *err = NULL;
5271 	struct tog_blame_view_state *s = &view->state.blame;
5272 
5273 	if (s->blame.thread)
5274 		err = stop_blame(&s->blame);
5275 
5276 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5277 		struct got_object_qid *blamed_commit;
5278 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5279 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5280 		got_object_qid_free(blamed_commit);
5281 	}
5282 
5283 	free(s->path);
5284 	free_colors(&s->colors);
5285 	return err;
5286 }
5287 
5288 static const struct got_error *
5289 search_start_blame_view(struct tog_view *view)
5290 {
5291 	struct tog_blame_view_state *s = &view->state.blame;
5292 
5293 	s->matched_line = 0;
5294 	return NULL;
5295 }
5296 
5297 static const struct got_error *
5298 search_next_blame_view(struct tog_view *view)
5299 {
5300 	struct tog_blame_view_state *s = &view->state.blame;
5301 	const struct got_error *err = NULL;
5302 	int lineno;
5303 	char *line = NULL;
5304 	size_t linesize = 0;
5305 	ssize_t linelen;
5306 
5307 	if (!view->searching) {
5308 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5309 		return NULL;
5310 	}
5311 
5312 	if (s->matched_line) {
5313 		if (view->searching == TOG_SEARCH_FORWARD)
5314 			lineno = s->matched_line + 1;
5315 		else
5316 			lineno = s->matched_line - 1;
5317 	} else
5318 		lineno = s->first_displayed_line - 1 + s->selected_line;
5319 
5320 	while (1) {
5321 		off_t offset;
5322 
5323 		if (lineno <= 0 || lineno > s->blame.nlines) {
5324 			if (s->matched_line == 0) {
5325 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5326 				break;
5327 			}
5328 
5329 			if (view->searching == TOG_SEARCH_FORWARD)
5330 				lineno = 1;
5331 			else
5332 				lineno = s->blame.nlines;
5333 		}
5334 
5335 		offset = s->blame.line_offsets[lineno - 1];
5336 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5337 			free(line);
5338 			return got_error_from_errno("fseeko");
5339 		}
5340 		linelen = getline(&line, &linesize, s->blame.f);
5341 		if (linelen != -1) {
5342 			char *exstr;
5343 			err = expand_tab(&exstr, line);
5344 			if (err)
5345 				break;
5346 			if (match_line(exstr, &view->regex, 1,
5347 			    &view->regmatch)) {
5348 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5349 				s->matched_line = lineno;
5350 				free(exstr);
5351 				break;
5352 			}
5353 			free(exstr);
5354 		}
5355 		if (view->searching == TOG_SEARCH_FORWARD)
5356 			lineno++;
5357 		else
5358 			lineno--;
5359 	}
5360 	free(line);
5361 
5362 	if (s->matched_line) {
5363 		s->first_displayed_line = s->matched_line;
5364 		s->selected_line = 1;
5365 	}
5366 
5367 	return err;
5368 }
5369 
5370 static const struct got_error *
5371 show_blame_view(struct tog_view *view)
5372 {
5373 	const struct got_error *err = NULL;
5374 	struct tog_blame_view_state *s = &view->state.blame;
5375 	int errcode;
5376 
5377 	if (s->blame.thread == NULL && !s->blame_complete) {
5378 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5379 		    &s->blame.thread_args);
5380 		if (errcode)
5381 			return got_error_set_errno(errcode, "pthread_create");
5382 
5383 		halfdelay(1); /* fast refresh while annotating  */
5384 	}
5385 
5386 	if (s->blame_complete)
5387 		halfdelay(10); /* disable fast refresh */
5388 
5389 	err = draw_blame(view);
5390 
5391 	view_border(view);
5392 	return err;
5393 }
5394 
5395 static const struct got_error *
5396 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5397 {
5398 	const struct got_error *err = NULL, *thread_err = NULL;
5399 	struct tog_view *diff_view;
5400 	struct tog_blame_view_state *s = &view->state.blame;
5401 	int eos, nscroll, begin_y = 0, begin_x = 0;
5402 
5403 	eos = nscroll = view->nlines - 2;
5404 	if (view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
5405 	    view_is_splitscreen(view->child))
5406 		--eos;  /* border */
5407 
5408 	switch (ch) {
5409 	case '0':
5410 		view->x = 0;
5411 		break;
5412 	case '$':
5413 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5414 		view->count = 0;
5415 		break;
5416 	case KEY_RIGHT:
5417 	case 'l':
5418 		if (view->x + view->ncols / 3 < view->maxx)
5419 			view->x += 2;  /* move two columns right */
5420 		else
5421 			view->count = 0;
5422 		break;
5423 	case KEY_LEFT:
5424 	case 'h':
5425 		view->x -= MIN(view->x, 2);  /* move two columns back */
5426 		if (view->x <= 0)
5427 			view->count = 0;
5428 		break;
5429 	case 'q':
5430 		s->done = 1;
5431 		break;
5432 	case 'g':
5433 	case KEY_HOME:
5434 		s->selected_line = 1;
5435 		s->first_displayed_line = 1;
5436 		view->count = 0;
5437 		break;
5438 	case 'G':
5439 	case KEY_END:
5440 		if (s->blame.nlines < eos) {
5441 			s->selected_line = s->blame.nlines;
5442 			s->first_displayed_line = 1;
5443 		} else {
5444 			s->selected_line = eos;
5445 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5446 		}
5447 		view->count = 0;
5448 		break;
5449 	case 'k':
5450 	case KEY_UP:
5451 	case CTRL('p'):
5452 		if (s->selected_line > 1)
5453 			s->selected_line--;
5454 		else if (s->selected_line == 1 &&
5455 		    s->first_displayed_line > 1)
5456 			s->first_displayed_line--;
5457 		else
5458 			view->count = 0;
5459 		break;
5460 	case CTRL('u'):
5461 	case 'u':
5462 		nscroll /= 2;
5463 		/* FALL THROUGH */
5464 	case KEY_PPAGE:
5465 	case CTRL('b'):
5466 	case 'b':
5467 		if (s->first_displayed_line == 1) {
5468 			if (view->count > 1)
5469 				nscroll += nscroll;
5470 			s->selected_line = MAX(1, s->selected_line - nscroll);
5471 			view->count = 0;
5472 			break;
5473 		}
5474 		if (s->first_displayed_line > nscroll)
5475 			s->first_displayed_line -= nscroll;
5476 		else
5477 			s->first_displayed_line = 1;
5478 		break;
5479 	case 'j':
5480 	case KEY_DOWN:
5481 	case CTRL('n'):
5482 		if (s->selected_line < eos && s->first_displayed_line +
5483 		    s->selected_line <= s->blame.nlines)
5484 			s->selected_line++;
5485 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5486 			s->first_displayed_line++;
5487 		else
5488 			view->count = 0;
5489 		break;
5490 	case 'c':
5491 	case 'p': {
5492 		struct got_object_id *id = NULL;
5493 
5494 		view->count = 0;
5495 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5496 		    s->first_displayed_line, s->selected_line);
5497 		if (id == NULL)
5498 			break;
5499 		if (ch == 'p') {
5500 			struct got_commit_object *commit, *pcommit;
5501 			struct got_object_qid *pid;
5502 			struct got_object_id *blob_id = NULL;
5503 			int obj_type;
5504 			err = got_object_open_as_commit(&commit,
5505 			    s->repo, id);
5506 			if (err)
5507 				break;
5508 			pid = STAILQ_FIRST(
5509 			    got_object_commit_get_parent_ids(commit));
5510 			if (pid == NULL) {
5511 				got_object_commit_close(commit);
5512 				break;
5513 			}
5514 			/* Check if path history ends here. */
5515 			err = got_object_open_as_commit(&pcommit,
5516 			    s->repo, &pid->id);
5517 			if (err)
5518 				break;
5519 			err = got_object_id_by_path(&blob_id, s->repo,
5520 			    pcommit, s->path);
5521 			got_object_commit_close(pcommit);
5522 			if (err) {
5523 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
5524 					err = NULL;
5525 				got_object_commit_close(commit);
5526 				break;
5527 			}
5528 			err = got_object_get_type(&obj_type, s->repo,
5529 			    blob_id);
5530 			free(blob_id);
5531 			/* Can't blame non-blob type objects. */
5532 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
5533 				got_object_commit_close(commit);
5534 				break;
5535 			}
5536 			err = got_object_qid_alloc(&s->blamed_commit,
5537 			    &pid->id);
5538 			got_object_commit_close(commit);
5539 		} else {
5540 			if (got_object_id_cmp(id,
5541 			    &s->blamed_commit->id) == 0)
5542 				break;
5543 			err = got_object_qid_alloc(&s->blamed_commit,
5544 			    id);
5545 		}
5546 		if (err)
5547 			break;
5548 		s->done = 1;
5549 		thread_err = stop_blame(&s->blame);
5550 		s->done = 0;
5551 		if (thread_err)
5552 			break;
5553 		STAILQ_INSERT_HEAD(&s->blamed_commits,
5554 		    s->blamed_commit, entry);
5555 		err = run_blame(view);
5556 		if (err)
5557 			break;
5558 		break;
5559 	}
5560 	case 'C': {
5561 		struct got_object_qid *first;
5562 
5563 		view->count = 0;
5564 		first = STAILQ_FIRST(&s->blamed_commits);
5565 		if (!got_object_id_cmp(&first->id, s->commit_id))
5566 			break;
5567 		s->done = 1;
5568 		thread_err = stop_blame(&s->blame);
5569 		s->done = 0;
5570 		if (thread_err)
5571 			break;
5572 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5573 		got_object_qid_free(s->blamed_commit);
5574 		s->blamed_commit =
5575 		    STAILQ_FIRST(&s->blamed_commits);
5576 		err = run_blame(view);
5577 		if (err)
5578 			break;
5579 		break;
5580 	}
5581 	case KEY_ENTER:
5582 	case '\r': {
5583 		struct got_object_id *id = NULL;
5584 		struct got_object_qid *pid;
5585 		struct got_commit_object *commit = NULL;
5586 
5587 		view->count = 0;
5588 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5589 		    s->first_displayed_line, s->selected_line);
5590 		if (id == NULL)
5591 			break;
5592 		err = got_object_open_as_commit(&commit, s->repo, id);
5593 		if (err)
5594 			break;
5595 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
5596 		if (view_is_parent_view(view))
5597 			view_get_split(view, &begin_y, &begin_x);
5598 
5599 		diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
5600 		if (diff_view == NULL) {
5601 			got_object_commit_close(commit);
5602 			err = got_error_from_errno("view_open");
5603 			break;
5604 		}
5605 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
5606 		    id, NULL, NULL, 3, 0, 0, NULL, s->repo);
5607 		got_object_commit_close(commit);
5608 		if (err) {
5609 			view_close(diff_view);
5610 			break;
5611 		}
5612 		if (view->mode == TOG_VIEW_SPLIT_HRZN) {
5613 			err = view_init_hsplit(view, begin_y);
5614 			if (err)
5615 				break;
5616 		}
5617 
5618 		view->focussed = 0;
5619 		diff_view->focussed = 1;
5620 		diff_view->mode = view->mode;
5621 		diff_view->nlines = view->lines - begin_y;
5622 		if (view_is_parent_view(view)) {
5623 			err = view_close_child(view);
5624 			if (err)
5625 				break;
5626 			err = view_set_child(view, diff_view);
5627 			if (err)
5628 				break;
5629 			view->focus_child = 1;
5630 		} else
5631 			*new_view = diff_view;
5632 		if (err)
5633 			break;
5634 		break;
5635 	}
5636 	case CTRL('d'):
5637 	case 'd':
5638 		nscroll /= 2;
5639 		/* FALL THROUGH */
5640 	case KEY_NPAGE:
5641 	case CTRL('f'):
5642 	case 'f':
5643 	case ' ':
5644 		if (s->last_displayed_line >= s->blame.nlines &&
5645 		    s->selected_line >= MIN(s->blame.nlines,
5646 		    view->nlines - 2)) {
5647 			view->count = 0;
5648 			break;
5649 		}
5650 		if (s->last_displayed_line >= s->blame.nlines &&
5651 		    s->selected_line < view->nlines - 2) {
5652 			s->selected_line +=
5653 			    MIN(nscroll, s->last_displayed_line -
5654 			    s->first_displayed_line - s->selected_line + 1);
5655 		}
5656 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
5657 			s->first_displayed_line += nscroll;
5658 		else
5659 			s->first_displayed_line =
5660 			    s->blame.nlines - (view->nlines - 3);
5661 		break;
5662 	case KEY_RESIZE:
5663 		if (s->selected_line > view->nlines - 2) {
5664 			s->selected_line = MIN(s->blame.nlines,
5665 			    view->nlines - 2);
5666 		}
5667 		break;
5668 	default:
5669 		view->count = 0;
5670 		break;
5671 	}
5672 	return thread_err ? thread_err : err;
5673 }
5674 
5675 static const struct got_error *
5676 reset_blame_view(struct tog_view *view)
5677 {
5678 	const struct got_error *err;
5679 	struct tog_blame_view_state *s = &view->state.blame;
5680 
5681 	view->count = 0;
5682 	s->done = 1;
5683 	err = stop_blame(&s->blame);
5684 	s->done = 0;
5685 	if (err)
5686 		return err;
5687 	return run_blame(view);
5688 }
5689 
5690 static const struct got_error *
5691 cmd_blame(int argc, char *argv[])
5692 {
5693 	const struct got_error *error;
5694 	struct got_repository *repo = NULL;
5695 	struct got_worktree *worktree = NULL;
5696 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
5697 	char *link_target = NULL;
5698 	struct got_object_id *commit_id = NULL;
5699 	struct got_commit_object *commit = NULL;
5700 	char *commit_id_str = NULL;
5701 	int ch;
5702 	struct tog_view *view;
5703 	int *pack_fds = NULL;
5704 
5705 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
5706 		switch (ch) {
5707 		case 'c':
5708 			commit_id_str = optarg;
5709 			break;
5710 		case 'r':
5711 			repo_path = realpath(optarg, NULL);
5712 			if (repo_path == NULL)
5713 				return got_error_from_errno2("realpath",
5714 				    optarg);
5715 			break;
5716 		default:
5717 			usage_blame();
5718 			/* NOTREACHED */
5719 		}
5720 	}
5721 
5722 	argc -= optind;
5723 	argv += optind;
5724 
5725 	if (argc != 1)
5726 		usage_blame();
5727 
5728 	error = got_repo_pack_fds_open(&pack_fds);
5729 	if (error != NULL)
5730 		goto done;
5731 
5732 	if (repo_path == NULL) {
5733 		cwd = getcwd(NULL, 0);
5734 		if (cwd == NULL)
5735 			return got_error_from_errno("getcwd");
5736 		error = got_worktree_open(&worktree, cwd);
5737 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5738 			goto done;
5739 		if (worktree)
5740 			repo_path =
5741 			    strdup(got_worktree_get_repo_path(worktree));
5742 		else
5743 			repo_path = strdup(cwd);
5744 		if (repo_path == NULL) {
5745 			error = got_error_from_errno("strdup");
5746 			goto done;
5747 		}
5748 	}
5749 
5750 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5751 	if (error != NULL)
5752 		goto done;
5753 
5754 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
5755 	    worktree);
5756 	if (error)
5757 		goto done;
5758 
5759 	init_curses();
5760 
5761 	error = apply_unveil(got_repo_get_path(repo), NULL);
5762 	if (error)
5763 		goto done;
5764 
5765 	error = tog_load_refs(repo, 0);
5766 	if (error)
5767 		goto done;
5768 
5769 	if (commit_id_str == NULL) {
5770 		struct got_reference *head_ref;
5771 		error = got_ref_open(&head_ref, repo, worktree ?
5772 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
5773 		if (error != NULL)
5774 			goto done;
5775 		error = got_ref_resolve(&commit_id, repo, head_ref);
5776 		got_ref_close(head_ref);
5777 	} else {
5778 		error = got_repo_match_object_id(&commit_id, NULL,
5779 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
5780 	}
5781 	if (error != NULL)
5782 		goto done;
5783 
5784 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
5785 	if (view == NULL) {
5786 		error = got_error_from_errno("view_open");
5787 		goto done;
5788 	}
5789 
5790 	error = got_object_open_as_commit(&commit, repo, commit_id);
5791 	if (error)
5792 		goto done;
5793 
5794 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
5795 	    commit, repo);
5796 	if (error)
5797 		goto done;
5798 
5799 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
5800 	    commit_id, repo);
5801 	if (error)
5802 		goto done;
5803 	if (worktree) {
5804 		/* Release work tree lock. */
5805 		got_worktree_close(worktree);
5806 		worktree = NULL;
5807 	}
5808 	error = view_loop(view);
5809 done:
5810 	free(repo_path);
5811 	free(in_repo_path);
5812 	free(link_target);
5813 	free(cwd);
5814 	free(commit_id);
5815 	if (commit)
5816 		got_object_commit_close(commit);
5817 	if (worktree)
5818 		got_worktree_close(worktree);
5819 	if (repo) {
5820 		const struct got_error *close_err = got_repo_close(repo);
5821 		if (error == NULL)
5822 			error = close_err;
5823 	}
5824 	if (pack_fds) {
5825 		const struct got_error *pack_err =
5826 		    got_repo_pack_fds_close(pack_fds);
5827 		if (error == NULL)
5828 			error = pack_err;
5829 	}
5830 	tog_free_refs();
5831 	return error;
5832 }
5833 
5834 static const struct got_error *
5835 draw_tree_entries(struct tog_view *view, const char *parent_path)
5836 {
5837 	struct tog_tree_view_state *s = &view->state.tree;
5838 	const struct got_error *err = NULL;
5839 	struct got_tree_entry *te;
5840 	wchar_t *wline;
5841 	struct tog_color *tc;
5842 	int width, n, i, nentries;
5843 	int limit = view->nlines;
5844 
5845 	s->ndisplayed = 0;
5846 	if (view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
5847 	    view_is_splitscreen(view->child))
5848 		--limit;  /* border */
5849 
5850 	werase(view->window);
5851 
5852 	if (limit == 0)
5853 		return NULL;
5854 
5855 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
5856 	    0, 0);
5857 	if (err)
5858 		return err;
5859 	if (view_needs_focus_indication(view))
5860 		wstandout(view->window);
5861 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5862 	if (tc)
5863 		wattr_on(view->window,
5864 		    COLOR_PAIR(tc->colorpair), NULL);
5865 	waddwstr(view->window, wline);
5866 	if (tc)
5867 		wattr_off(view->window,
5868 		    COLOR_PAIR(tc->colorpair), NULL);
5869 	if (view_needs_focus_indication(view))
5870 		wstandend(view->window);
5871 	free(wline);
5872 	wline = NULL;
5873 	if (width < view->ncols - 1)
5874 		waddch(view->window, '\n');
5875 	if (--limit <= 0)
5876 		return NULL;
5877 	err = format_line(&wline, &width, NULL, parent_path, 0, view->ncols,
5878 	    0, 0);
5879 	if (err)
5880 		return err;
5881 	waddwstr(view->window, wline);
5882 	free(wline);
5883 	wline = NULL;
5884 	if (width < view->ncols - 1)
5885 		waddch(view->window, '\n');
5886 	if (--limit <= 0)
5887 		return NULL;
5888 	waddch(view->window, '\n');
5889 	if (--limit <= 0)
5890 		return NULL;
5891 
5892 	if (s->first_displayed_entry == NULL) {
5893 		te = got_object_tree_get_first_entry(s->tree);
5894 		if (s->selected == 0) {
5895 			if (view->focussed)
5896 				wstandout(view->window);
5897 			s->selected_entry = NULL;
5898 		}
5899 		waddstr(view->window, "  ..\n");	/* parent directory */
5900 		if (s->selected == 0 && view->focussed)
5901 			wstandend(view->window);
5902 		s->ndisplayed++;
5903 		if (--limit <= 0)
5904 			return NULL;
5905 		n = 1;
5906 	} else {
5907 		n = 0;
5908 		te = s->first_displayed_entry;
5909 	}
5910 
5911 	nentries = got_object_tree_get_nentries(s->tree);
5912 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
5913 		char *line = NULL, *id_str = NULL, *link_target = NULL;
5914 		const char *modestr = "";
5915 		mode_t mode;
5916 
5917 		te = got_object_tree_get_entry(s->tree, i);
5918 		mode = got_tree_entry_get_mode(te);
5919 
5920 		if (s->show_ids) {
5921 			err = got_object_id_str(&id_str,
5922 			    got_tree_entry_get_id(te));
5923 			if (err)
5924 				return got_error_from_errno(
5925 				    "got_object_id_str");
5926 		}
5927 		if (got_object_tree_entry_is_submodule(te))
5928 			modestr = "$";
5929 		else if (S_ISLNK(mode)) {
5930 			int i;
5931 
5932 			err = got_tree_entry_get_symlink_target(&link_target,
5933 			    te, s->repo);
5934 			if (err) {
5935 				free(id_str);
5936 				return err;
5937 			}
5938 			for (i = 0; i < strlen(link_target); i++) {
5939 				if (!isprint((unsigned char)link_target[i]))
5940 					link_target[i] = '?';
5941 			}
5942 			modestr = "@";
5943 		}
5944 		else if (S_ISDIR(mode))
5945 			modestr = "/";
5946 		else if (mode & S_IXUSR)
5947 			modestr = "*";
5948 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
5949 		    got_tree_entry_get_name(te), modestr,
5950 		    link_target ? " -> ": "",
5951 		    link_target ? link_target : "") == -1) {
5952 			free(id_str);
5953 			free(link_target);
5954 			return got_error_from_errno("asprintf");
5955 		}
5956 		free(id_str);
5957 		free(link_target);
5958 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
5959 		    0, 0);
5960 		if (err) {
5961 			free(line);
5962 			break;
5963 		}
5964 		if (n == s->selected) {
5965 			if (view->focussed)
5966 				wstandout(view->window);
5967 			s->selected_entry = te;
5968 		}
5969 		tc = match_color(&s->colors, line);
5970 		if (tc)
5971 			wattr_on(view->window,
5972 			    COLOR_PAIR(tc->colorpair), NULL);
5973 		waddwstr(view->window, wline);
5974 		if (tc)
5975 			wattr_off(view->window,
5976 			    COLOR_PAIR(tc->colorpair), NULL);
5977 		if (width < view->ncols - 1)
5978 			waddch(view->window, '\n');
5979 		if (n == s->selected && view->focussed)
5980 			wstandend(view->window);
5981 		free(line);
5982 		free(wline);
5983 		wline = NULL;
5984 		n++;
5985 		s->ndisplayed++;
5986 		s->last_displayed_entry = te;
5987 		if (--limit <= 0)
5988 			break;
5989 	}
5990 
5991 	return err;
5992 }
5993 
5994 static void
5995 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
5996 {
5997 	struct got_tree_entry *te;
5998 	int isroot = s->tree == s->root;
5999 	int i = 0;
6000 
6001 	if (s->first_displayed_entry == NULL)
6002 		return;
6003 
6004 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6005 	while (i++ < maxscroll) {
6006 		if (te == NULL) {
6007 			if (!isroot)
6008 				s->first_displayed_entry = NULL;
6009 			break;
6010 		}
6011 		s->first_displayed_entry = te;
6012 		te = got_tree_entry_get_prev(s->tree, te);
6013 	}
6014 }
6015 
6016 static const struct got_error *
6017 tree_scroll_down(struct tog_view *view, int maxscroll)
6018 {
6019 	struct tog_tree_view_state *s = &view->state.tree;
6020 	struct got_tree_entry *next, *last;
6021 	int n = 0;
6022 
6023 	if (s->first_displayed_entry)
6024 		next = got_tree_entry_get_next(s->tree,
6025 		    s->first_displayed_entry);
6026 	else
6027 		next = got_object_tree_get_first_entry(s->tree);
6028 
6029 	last = s->last_displayed_entry;
6030 	while (next && n++ < maxscroll) {
6031 		if (last)
6032 			last = got_tree_entry_get_next(s->tree, last);
6033 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6034 			s->first_displayed_entry = next;
6035 			next = got_tree_entry_get_next(s->tree, next);
6036 		}
6037 	}
6038 
6039 	return NULL;
6040 }
6041 
6042 static const struct got_error *
6043 tree_entry_path(char **path, struct tog_parent_trees *parents,
6044     struct got_tree_entry *te)
6045 {
6046 	const struct got_error *err = NULL;
6047 	struct tog_parent_tree *pt;
6048 	size_t len = 2; /* for leading slash and NUL */
6049 
6050 	TAILQ_FOREACH(pt, parents, entry)
6051 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6052 		    + 1 /* slash */;
6053 	if (te)
6054 		len += strlen(got_tree_entry_get_name(te));
6055 
6056 	*path = calloc(1, len);
6057 	if (path == NULL)
6058 		return got_error_from_errno("calloc");
6059 
6060 	(*path)[0] = '/';
6061 	pt = TAILQ_LAST(parents, tog_parent_trees);
6062 	while (pt) {
6063 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6064 		if (strlcat(*path, name, len) >= len) {
6065 			err = got_error(GOT_ERR_NO_SPACE);
6066 			goto done;
6067 		}
6068 		if (strlcat(*path, "/", len) >= len) {
6069 			err = got_error(GOT_ERR_NO_SPACE);
6070 			goto done;
6071 		}
6072 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6073 	}
6074 	if (te) {
6075 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6076 			err = got_error(GOT_ERR_NO_SPACE);
6077 			goto done;
6078 		}
6079 	}
6080 done:
6081 	if (err) {
6082 		free(*path);
6083 		*path = NULL;
6084 	}
6085 	return err;
6086 }
6087 
6088 static const struct got_error *
6089 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6090     struct got_tree_entry *te, struct tog_parent_trees *parents,
6091     struct got_object_id *commit_id, struct got_repository *repo)
6092 {
6093 	const struct got_error *err = NULL;
6094 	char *path;
6095 	struct tog_view *blame_view;
6096 
6097 	*new_view = NULL;
6098 
6099 	err = tree_entry_path(&path, parents, te);
6100 	if (err)
6101 		return err;
6102 
6103 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6104 	if (blame_view == NULL) {
6105 		err = got_error_from_errno("view_open");
6106 		goto done;
6107 	}
6108 
6109 	err = open_blame_view(blame_view, path, commit_id, repo);
6110 	if (err) {
6111 		if (err->code == GOT_ERR_CANCELLED)
6112 			err = NULL;
6113 		view_close(blame_view);
6114 	} else
6115 		*new_view = blame_view;
6116 done:
6117 	free(path);
6118 	return err;
6119 }
6120 
6121 static const struct got_error *
6122 log_selected_tree_entry(struct tog_view **new_view, int begin_x,
6123     struct tog_tree_view_state *s)
6124 {
6125 	struct tog_view *log_view;
6126 	const struct got_error *err = NULL;
6127 	char *path;
6128 
6129 	*new_view = NULL;
6130 
6131 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
6132 	if (log_view == NULL)
6133 		return got_error_from_errno("view_open");
6134 
6135 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6136 	if (err)
6137 		return err;
6138 
6139 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6140 	    path, 0);
6141 	if (err)
6142 		view_close(log_view);
6143 	else
6144 		*new_view = log_view;
6145 	free(path);
6146 	return err;
6147 }
6148 
6149 static const struct got_error *
6150 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6151     const char *head_ref_name, struct got_repository *repo)
6152 {
6153 	const struct got_error *err = NULL;
6154 	char *commit_id_str = NULL;
6155 	struct tog_tree_view_state *s = &view->state.tree;
6156 	struct got_commit_object *commit = NULL;
6157 
6158 	TAILQ_INIT(&s->parents);
6159 	STAILQ_INIT(&s->colors);
6160 
6161 	s->commit_id = got_object_id_dup(commit_id);
6162 	if (s->commit_id == NULL)
6163 		return got_error_from_errno("got_object_id_dup");
6164 
6165 	err = got_object_open_as_commit(&commit, repo, commit_id);
6166 	if (err)
6167 		goto done;
6168 
6169 	/*
6170 	 * The root is opened here and will be closed when the view is closed.
6171 	 * Any visited subtrees and their path-wise parents are opened and
6172 	 * closed on demand.
6173 	 */
6174 	err = got_object_open_as_tree(&s->root, repo,
6175 	    got_object_commit_get_tree_id(commit));
6176 	if (err)
6177 		goto done;
6178 	s->tree = s->root;
6179 
6180 	err = got_object_id_str(&commit_id_str, commit_id);
6181 	if (err != NULL)
6182 		goto done;
6183 
6184 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6185 		err = got_error_from_errno("asprintf");
6186 		goto done;
6187 	}
6188 
6189 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6190 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6191 	if (head_ref_name) {
6192 		s->head_ref_name = strdup(head_ref_name);
6193 		if (s->head_ref_name == NULL) {
6194 			err = got_error_from_errno("strdup");
6195 			goto done;
6196 		}
6197 	}
6198 	s->repo = repo;
6199 
6200 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6201 		err = add_color(&s->colors, "\\$$",
6202 		    TOG_COLOR_TREE_SUBMODULE,
6203 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6204 		if (err)
6205 			goto done;
6206 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6207 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6208 		if (err)
6209 			goto done;
6210 		err = add_color(&s->colors, "/$",
6211 		    TOG_COLOR_TREE_DIRECTORY,
6212 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6213 		if (err)
6214 			goto done;
6215 
6216 		err = add_color(&s->colors, "\\*$",
6217 		    TOG_COLOR_TREE_EXECUTABLE,
6218 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6219 		if (err)
6220 			goto done;
6221 
6222 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6223 		    get_color_value("TOG_COLOR_COMMIT"));
6224 		if (err)
6225 			goto done;
6226 	}
6227 
6228 	view->show = show_tree_view;
6229 	view->input = input_tree_view;
6230 	view->close = close_tree_view;
6231 	view->search_start = search_start_tree_view;
6232 	view->search_next = search_next_tree_view;
6233 done:
6234 	free(commit_id_str);
6235 	if (commit)
6236 		got_object_commit_close(commit);
6237 	if (err)
6238 		close_tree_view(view);
6239 	return err;
6240 }
6241 
6242 static const struct got_error *
6243 close_tree_view(struct tog_view *view)
6244 {
6245 	struct tog_tree_view_state *s = &view->state.tree;
6246 
6247 	free_colors(&s->colors);
6248 	free(s->tree_label);
6249 	s->tree_label = NULL;
6250 	free(s->commit_id);
6251 	s->commit_id = NULL;
6252 	free(s->head_ref_name);
6253 	s->head_ref_name = NULL;
6254 	while (!TAILQ_EMPTY(&s->parents)) {
6255 		struct tog_parent_tree *parent;
6256 		parent = TAILQ_FIRST(&s->parents);
6257 		TAILQ_REMOVE(&s->parents, parent, entry);
6258 		if (parent->tree != s->root)
6259 			got_object_tree_close(parent->tree);
6260 		free(parent);
6261 
6262 	}
6263 	if (s->tree != NULL && s->tree != s->root)
6264 		got_object_tree_close(s->tree);
6265 	if (s->root)
6266 		got_object_tree_close(s->root);
6267 	return NULL;
6268 }
6269 
6270 static const struct got_error *
6271 search_start_tree_view(struct tog_view *view)
6272 {
6273 	struct tog_tree_view_state *s = &view->state.tree;
6274 
6275 	s->matched_entry = NULL;
6276 	return NULL;
6277 }
6278 
6279 static int
6280 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6281 {
6282 	regmatch_t regmatch;
6283 
6284 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6285 	    0) == 0;
6286 }
6287 
6288 static const struct got_error *
6289 search_next_tree_view(struct tog_view *view)
6290 {
6291 	struct tog_tree_view_state *s = &view->state.tree;
6292 	struct got_tree_entry *te = NULL;
6293 
6294 	if (!view->searching) {
6295 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6296 		return NULL;
6297 	}
6298 
6299 	if (s->matched_entry) {
6300 		if (view->searching == TOG_SEARCH_FORWARD) {
6301 			if (s->selected_entry)
6302 				te = got_tree_entry_get_next(s->tree,
6303 				    s->selected_entry);
6304 			else
6305 				te = got_object_tree_get_first_entry(s->tree);
6306 		} else {
6307 			if (s->selected_entry == NULL)
6308 				te = got_object_tree_get_last_entry(s->tree);
6309 			else
6310 				te = got_tree_entry_get_prev(s->tree,
6311 				    s->selected_entry);
6312 		}
6313 	} else {
6314 		if (s->selected_entry)
6315 			te = s->selected_entry;
6316 		else if (view->searching == TOG_SEARCH_FORWARD)
6317 			te = got_object_tree_get_first_entry(s->tree);
6318 		else
6319 			te = got_object_tree_get_last_entry(s->tree);
6320 	}
6321 
6322 	while (1) {
6323 		if (te == NULL) {
6324 			if (s->matched_entry == NULL) {
6325 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6326 				return NULL;
6327 			}
6328 			if (view->searching == TOG_SEARCH_FORWARD)
6329 				te = got_object_tree_get_first_entry(s->tree);
6330 			else
6331 				te = got_object_tree_get_last_entry(s->tree);
6332 		}
6333 
6334 		if (match_tree_entry(te, &view->regex)) {
6335 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6336 			s->matched_entry = te;
6337 			break;
6338 		}
6339 
6340 		if (view->searching == TOG_SEARCH_FORWARD)
6341 			te = got_tree_entry_get_next(s->tree, te);
6342 		else
6343 			te = got_tree_entry_get_prev(s->tree, te);
6344 	}
6345 
6346 	if (s->matched_entry) {
6347 		s->first_displayed_entry = s->matched_entry;
6348 		s->selected = 0;
6349 	}
6350 
6351 	return NULL;
6352 }
6353 
6354 static const struct got_error *
6355 show_tree_view(struct tog_view *view)
6356 {
6357 	const struct got_error *err = NULL;
6358 	struct tog_tree_view_state *s = &view->state.tree;
6359 	char *parent_path;
6360 
6361 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6362 	if (err)
6363 		return err;
6364 
6365 	err = draw_tree_entries(view, parent_path);
6366 	free(parent_path);
6367 
6368 	view_border(view);
6369 	return err;
6370 }
6371 
6372 static const struct got_error *
6373 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6374 {
6375 	const struct got_error *err = NULL;
6376 	struct tog_tree_view_state *s = &view->state.tree;
6377 	struct tog_view *log_view, *ref_view;
6378 	struct got_tree_entry *te;
6379 	int begin_x = 0, n, nscroll = view->nlines - 3;
6380 
6381 	switch (ch) {
6382 	case 'i':
6383 		s->show_ids = !s->show_ids;
6384 		view->count = 0;
6385 		break;
6386 	case 'l':
6387 		view->count = 0;
6388 		if (!s->selected_entry)
6389 			break;
6390 		if (view_is_parent_view(view))
6391 			begin_x = view_split_begin_x(view->begin_x);
6392 		err = log_selected_tree_entry(&log_view, begin_x, s);
6393 		view->focussed = 0;
6394 		log_view->focussed = 1;
6395 		if (view_is_parent_view(view)) {
6396 			err = view_close_child(view);
6397 			if (err)
6398 				return err;
6399 			err = view_set_child(view, log_view);
6400 			if (err)
6401 				return err;
6402 			view->focus_child = 1;
6403 		} else
6404 			*new_view = log_view;
6405 		break;
6406 	case 'r':
6407 		view->count = 0;
6408 		if (view_is_parent_view(view))
6409 			begin_x = view_split_begin_x(view->begin_x);
6410 		ref_view = view_open(view->nlines, view->ncols,
6411 		    view->begin_y, begin_x, TOG_VIEW_REF);
6412 		if (ref_view == NULL)
6413 			return got_error_from_errno("view_open");
6414 		err = open_ref_view(ref_view, s->repo);
6415 		if (err) {
6416 			view_close(ref_view);
6417 			return err;
6418 		}
6419 		view->focussed = 0;
6420 		ref_view->focussed = 1;
6421 		if (view_is_parent_view(view)) {
6422 			err = view_close_child(view);
6423 			if (err)
6424 				return err;
6425 			err = view_set_child(view, ref_view);
6426 			if (err)
6427 				return err;
6428 			view->focus_child = 1;
6429 		} else
6430 			*new_view = ref_view;
6431 		break;
6432 	case 'g':
6433 	case KEY_HOME:
6434 		s->selected = 0;
6435 		view->count = 0;
6436 		if (s->tree == s->root)
6437 			s->first_displayed_entry =
6438 			    got_object_tree_get_first_entry(s->tree);
6439 		else
6440 			s->first_displayed_entry = NULL;
6441 		break;
6442 	case 'G':
6443 	case KEY_END: {
6444 		int eos = view->nlines - 3;
6445 
6446 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6447 			--eos;  /* border */
6448 		s->selected = 0;
6449 		view->count = 0;
6450 		te = got_object_tree_get_last_entry(s->tree);
6451 		for (n = 0; n < eos; n++) {
6452 			if (te == NULL) {
6453 				if(s->tree != s->root) {
6454 					s->first_displayed_entry = NULL;
6455 					n++;
6456 				}
6457 				break;
6458 			}
6459 			s->first_displayed_entry = te;
6460 			te = got_tree_entry_get_prev(s->tree, te);
6461 		}
6462 		if (n > 0)
6463 			s->selected = n - 1;
6464 		break;
6465 	}
6466 	case 'k':
6467 	case KEY_UP:
6468 	case CTRL('p'):
6469 		if (s->selected > 0) {
6470 			s->selected--;
6471 			break;
6472 		}
6473 		tree_scroll_up(s, 1);
6474 		if (s->selected_entry == NULL ||
6475 		    (s->tree == s->root && s->selected_entry ==
6476 		     got_object_tree_get_first_entry(s->tree)))
6477 			view->count = 0;
6478 		break;
6479 	case CTRL('u'):
6480 	case 'u':
6481 		nscroll /= 2;
6482 		/* FALL THROUGH */
6483 	case KEY_PPAGE:
6484 	case CTRL('b'):
6485 	case 'b':
6486 		if (s->tree == s->root) {
6487 			if (got_object_tree_get_first_entry(s->tree) ==
6488 			    s->first_displayed_entry)
6489 				s->selected -= MIN(s->selected, nscroll);
6490 		} else {
6491 			if (s->first_displayed_entry == NULL)
6492 				s->selected -= MIN(s->selected, nscroll);
6493 		}
6494 		tree_scroll_up(s, MAX(0, nscroll));
6495 		if (s->selected_entry == NULL ||
6496 		    (s->tree == s->root && s->selected_entry ==
6497 		     got_object_tree_get_first_entry(s->tree)))
6498 			view->count = 0;
6499 		break;
6500 	case 'j':
6501 	case KEY_DOWN:
6502 	case CTRL('n'):
6503 		if (s->selected < s->ndisplayed - 1) {
6504 			s->selected++;
6505 			break;
6506 		}
6507 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6508 		    == NULL) {
6509 			/* can't scroll any further */
6510 			view->count = 0;
6511 			break;
6512 		}
6513 		tree_scroll_down(view, 1);
6514 		break;
6515 	case CTRL('d'):
6516 	case 'd':
6517 		nscroll /= 2;
6518 		/* FALL THROUGH */
6519 	case KEY_NPAGE:
6520 	case CTRL('f'):
6521 	case 'f':
6522 	case ' ':
6523 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
6524 		    == NULL) {
6525 			/* can't scroll any further; move cursor down */
6526 			if (s->selected < s->ndisplayed - 1)
6527 				s->selected += MIN(nscroll,
6528 				    s->ndisplayed - s->selected - 1);
6529 			else
6530 				view->count = 0;
6531 			break;
6532 		}
6533 		tree_scroll_down(view, nscroll);
6534 		break;
6535 	case KEY_ENTER:
6536 	case '\r':
6537 	case KEY_BACKSPACE:
6538 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
6539 			struct tog_parent_tree *parent;
6540 			/* user selected '..' */
6541 			if (s->tree == s->root) {
6542 				view->count = 0;
6543 				break;
6544 			}
6545 			parent = TAILQ_FIRST(&s->parents);
6546 			TAILQ_REMOVE(&s->parents, parent,
6547 			    entry);
6548 			got_object_tree_close(s->tree);
6549 			s->tree = parent->tree;
6550 			s->first_displayed_entry =
6551 			    parent->first_displayed_entry;
6552 			s->selected_entry =
6553 			    parent->selected_entry;
6554 			s->selected = parent->selected;
6555 			if (s->selected > view->nlines - 3) {
6556 				err = offset_selection_down(view);
6557 				if (err)
6558 					break;
6559 			}
6560 			free(parent);
6561 		} else if (S_ISDIR(got_tree_entry_get_mode(
6562 		    s->selected_entry))) {
6563 			struct got_tree_object *subtree;
6564 			view->count = 0;
6565 			err = got_object_open_as_tree(&subtree, s->repo,
6566 			    got_tree_entry_get_id(s->selected_entry));
6567 			if (err)
6568 				break;
6569 			err = tree_view_visit_subtree(s, subtree);
6570 			if (err) {
6571 				got_object_tree_close(subtree);
6572 				break;
6573 			}
6574 		} else if (S_ISREG(got_tree_entry_get_mode(
6575 		    s->selected_entry))) {
6576 			struct tog_view *blame_view;
6577 			int begin_x = 0, begin_y = 0;
6578 
6579 			if (view_is_parent_view(view))
6580 				view_get_split(view, &begin_y, &begin_x);
6581 
6582 			err = blame_tree_entry(&blame_view, begin_y, begin_x,
6583 			    s->selected_entry, &s->parents,
6584 			    s->commit_id, s->repo);
6585 			if (err)
6586 				break;
6587 
6588 			if (view->mode == TOG_VIEW_SPLIT_HRZN) {
6589 				err = view_init_hsplit(view, begin_y);
6590 				if (err)
6591 					break;
6592 			}
6593 
6594 			view->count = 0;
6595 			view->focussed = 0;
6596 			blame_view->focussed = 1;
6597 			blame_view->mode = view->mode;
6598 			blame_view->nlines = view->lines - begin_y;
6599 			if (view_is_parent_view(view)) {
6600 				err = view_close_child(view);
6601 				if (err)
6602 					return err;
6603 				err = view_set_child(view, blame_view);
6604 				if (err)
6605 					return err;
6606 				view->focus_child = 1;
6607 			} else
6608 				*new_view = blame_view;
6609 		}
6610 		break;
6611 	case KEY_RESIZE:
6612 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
6613 			s->selected = view->nlines - 4;
6614 		view->count = 0;
6615 		break;
6616 	default:
6617 		view->count = 0;
6618 		break;
6619 	}
6620 
6621 	return err;
6622 }
6623 
6624 __dead static void
6625 usage_tree(void)
6626 {
6627 	endwin();
6628 	fprintf(stderr,
6629 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
6630 	    getprogname());
6631 	exit(1);
6632 }
6633 
6634 static const struct got_error *
6635 cmd_tree(int argc, char *argv[])
6636 {
6637 	const struct got_error *error;
6638 	struct got_repository *repo = NULL;
6639 	struct got_worktree *worktree = NULL;
6640 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6641 	struct got_object_id *commit_id = NULL;
6642 	struct got_commit_object *commit = NULL;
6643 	const char *commit_id_arg = NULL;
6644 	char *label = NULL;
6645 	struct got_reference *ref = NULL;
6646 	const char *head_ref_name = NULL;
6647 	int ch;
6648 	struct tog_view *view;
6649 	int *pack_fds = NULL;
6650 
6651 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6652 		switch (ch) {
6653 		case 'c':
6654 			commit_id_arg = optarg;
6655 			break;
6656 		case 'r':
6657 			repo_path = realpath(optarg, NULL);
6658 			if (repo_path == NULL)
6659 				return got_error_from_errno2("realpath",
6660 				    optarg);
6661 			break;
6662 		default:
6663 			usage_tree();
6664 			/* NOTREACHED */
6665 		}
6666 	}
6667 
6668 	argc -= optind;
6669 	argv += optind;
6670 
6671 	if (argc > 1)
6672 		usage_tree();
6673 
6674 	error = got_repo_pack_fds_open(&pack_fds);
6675 	if (error != NULL)
6676 		goto done;
6677 
6678 	if (repo_path == NULL) {
6679 		cwd = getcwd(NULL, 0);
6680 		if (cwd == NULL)
6681 			return got_error_from_errno("getcwd");
6682 		error = got_worktree_open(&worktree, cwd);
6683 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6684 			goto done;
6685 		if (worktree)
6686 			repo_path =
6687 			    strdup(got_worktree_get_repo_path(worktree));
6688 		else
6689 			repo_path = strdup(cwd);
6690 		if (repo_path == NULL) {
6691 			error = got_error_from_errno("strdup");
6692 			goto done;
6693 		}
6694 	}
6695 
6696 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6697 	if (error != NULL)
6698 		goto done;
6699 
6700 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
6701 	    repo, worktree);
6702 	if (error)
6703 		goto done;
6704 
6705 	init_curses();
6706 
6707 	error = apply_unveil(got_repo_get_path(repo), NULL);
6708 	if (error)
6709 		goto done;
6710 
6711 	error = tog_load_refs(repo, 0);
6712 	if (error)
6713 		goto done;
6714 
6715 	if (commit_id_arg == NULL) {
6716 		error = got_repo_match_object_id(&commit_id, &label,
6717 		    worktree ? got_worktree_get_head_ref_name(worktree) :
6718 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6719 		if (error)
6720 			goto done;
6721 		head_ref_name = label;
6722 	} else {
6723 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
6724 		if (error == NULL)
6725 			head_ref_name = got_ref_get_name(ref);
6726 		else if (error->code != GOT_ERR_NOT_REF)
6727 			goto done;
6728 		error = got_repo_match_object_id(&commit_id, NULL,
6729 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6730 		if (error)
6731 			goto done;
6732 	}
6733 
6734 	error = got_object_open_as_commit(&commit, repo, commit_id);
6735 	if (error)
6736 		goto done;
6737 
6738 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
6739 	if (view == NULL) {
6740 		error = got_error_from_errno("view_open");
6741 		goto done;
6742 	}
6743 	error = open_tree_view(view, commit_id, head_ref_name, repo);
6744 	if (error)
6745 		goto done;
6746 	if (!got_path_is_root_dir(in_repo_path)) {
6747 		error = tree_view_walk_path(&view->state.tree, commit,
6748 		    in_repo_path);
6749 		if (error)
6750 			goto done;
6751 	}
6752 
6753 	if (worktree) {
6754 		/* Release work tree lock. */
6755 		got_worktree_close(worktree);
6756 		worktree = NULL;
6757 	}
6758 	error = view_loop(view);
6759 done:
6760 	free(repo_path);
6761 	free(cwd);
6762 	free(commit_id);
6763 	free(label);
6764 	if (ref)
6765 		got_ref_close(ref);
6766 	if (repo) {
6767 		const struct got_error *close_err = got_repo_close(repo);
6768 		if (error == NULL)
6769 			error = close_err;
6770 	}
6771 	if (pack_fds) {
6772 		const struct got_error *pack_err =
6773 		    got_repo_pack_fds_close(pack_fds);
6774 		if (error == NULL)
6775 			error = pack_err;
6776 	}
6777 	tog_free_refs();
6778 	return error;
6779 }
6780 
6781 static const struct got_error *
6782 ref_view_load_refs(struct tog_ref_view_state *s)
6783 {
6784 	struct got_reflist_entry *sre;
6785 	struct tog_reflist_entry *re;
6786 
6787 	s->nrefs = 0;
6788 	TAILQ_FOREACH(sre, &tog_refs, entry) {
6789 		if (strncmp(got_ref_get_name(sre->ref),
6790 		    "refs/got/", 9) == 0 &&
6791 		    strncmp(got_ref_get_name(sre->ref),
6792 		    "refs/got/backup/", 16) != 0)
6793 			continue;
6794 
6795 		re = malloc(sizeof(*re));
6796 		if (re == NULL)
6797 			return got_error_from_errno("malloc");
6798 
6799 		re->ref = got_ref_dup(sre->ref);
6800 		if (re->ref == NULL)
6801 			return got_error_from_errno("got_ref_dup");
6802 		re->idx = s->nrefs++;
6803 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
6804 	}
6805 
6806 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
6807 	return NULL;
6808 }
6809 
6810 static void
6811 ref_view_free_refs(struct tog_ref_view_state *s)
6812 {
6813 	struct tog_reflist_entry *re;
6814 
6815 	while (!TAILQ_EMPTY(&s->refs)) {
6816 		re = TAILQ_FIRST(&s->refs);
6817 		TAILQ_REMOVE(&s->refs, re, entry);
6818 		got_ref_close(re->ref);
6819 		free(re);
6820 	}
6821 }
6822 
6823 static const struct got_error *
6824 open_ref_view(struct tog_view *view, struct got_repository *repo)
6825 {
6826 	const struct got_error *err = NULL;
6827 	struct tog_ref_view_state *s = &view->state.ref;
6828 
6829 	s->selected_entry = 0;
6830 	s->repo = repo;
6831 
6832 	TAILQ_INIT(&s->refs);
6833 	STAILQ_INIT(&s->colors);
6834 
6835 	err = ref_view_load_refs(s);
6836 	if (err)
6837 		return err;
6838 
6839 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6840 		err = add_color(&s->colors, "^refs/heads/",
6841 		    TOG_COLOR_REFS_HEADS,
6842 		    get_color_value("TOG_COLOR_REFS_HEADS"));
6843 		if (err)
6844 			goto done;
6845 
6846 		err = add_color(&s->colors, "^refs/tags/",
6847 		    TOG_COLOR_REFS_TAGS,
6848 		    get_color_value("TOG_COLOR_REFS_TAGS"));
6849 		if (err)
6850 			goto done;
6851 
6852 		err = add_color(&s->colors, "^refs/remotes/",
6853 		    TOG_COLOR_REFS_REMOTES,
6854 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
6855 		if (err)
6856 			goto done;
6857 
6858 		err = add_color(&s->colors, "^refs/got/backup/",
6859 		    TOG_COLOR_REFS_BACKUP,
6860 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
6861 		if (err)
6862 			goto done;
6863 	}
6864 
6865 	view->show = show_ref_view;
6866 	view->input = input_ref_view;
6867 	view->close = close_ref_view;
6868 	view->search_start = search_start_ref_view;
6869 	view->search_next = search_next_ref_view;
6870 done:
6871 	if (err)
6872 		free_colors(&s->colors);
6873 	return err;
6874 }
6875 
6876 static const struct got_error *
6877 close_ref_view(struct tog_view *view)
6878 {
6879 	struct tog_ref_view_state *s = &view->state.ref;
6880 
6881 	ref_view_free_refs(s);
6882 	free_colors(&s->colors);
6883 
6884 	return NULL;
6885 }
6886 
6887 static const struct got_error *
6888 resolve_reflist_entry(struct got_object_id **commit_id,
6889     struct tog_reflist_entry *re, struct got_repository *repo)
6890 {
6891 	const struct got_error *err = NULL;
6892 	struct got_object_id *obj_id;
6893 	struct got_tag_object *tag = NULL;
6894 	int obj_type;
6895 
6896 	*commit_id = NULL;
6897 
6898 	err = got_ref_resolve(&obj_id, repo, re->ref);
6899 	if (err)
6900 		return err;
6901 
6902 	err = got_object_get_type(&obj_type, repo, obj_id);
6903 	if (err)
6904 		goto done;
6905 
6906 	switch (obj_type) {
6907 	case GOT_OBJ_TYPE_COMMIT:
6908 		*commit_id = obj_id;
6909 		break;
6910 	case GOT_OBJ_TYPE_TAG:
6911 		err = got_object_open_as_tag(&tag, repo, obj_id);
6912 		if (err)
6913 			goto done;
6914 		free(obj_id);
6915 		err = got_object_get_type(&obj_type, repo,
6916 		    got_object_tag_get_object_id(tag));
6917 		if (err)
6918 			goto done;
6919 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
6920 			err = got_error(GOT_ERR_OBJ_TYPE);
6921 			goto done;
6922 		}
6923 		*commit_id = got_object_id_dup(
6924 		    got_object_tag_get_object_id(tag));
6925 		if (*commit_id == NULL) {
6926 			err = got_error_from_errno("got_object_id_dup");
6927 			goto done;
6928 		}
6929 		break;
6930 	default:
6931 		err = got_error(GOT_ERR_OBJ_TYPE);
6932 		break;
6933 	}
6934 
6935 done:
6936 	if (tag)
6937 		got_object_tag_close(tag);
6938 	if (err) {
6939 		free(*commit_id);
6940 		*commit_id = NULL;
6941 	}
6942 	return err;
6943 }
6944 
6945 static const struct got_error *
6946 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
6947     struct tog_reflist_entry *re, struct got_repository *repo)
6948 {
6949 	struct tog_view *log_view;
6950 	const struct got_error *err = NULL;
6951 	struct got_object_id *commit_id = NULL;
6952 
6953 	*new_view = NULL;
6954 
6955 	err = resolve_reflist_entry(&commit_id, re, repo);
6956 	if (err) {
6957 		if (err->code != GOT_ERR_OBJ_TYPE)
6958 			return err;
6959 		else
6960 			return NULL;
6961 	}
6962 
6963 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6964 	if (log_view == NULL) {
6965 		err = got_error_from_errno("view_open");
6966 		goto done;
6967 	}
6968 
6969 	err = open_log_view(log_view, commit_id, repo,
6970 	    got_ref_get_name(re->ref), "", 0);
6971 done:
6972 	if (err)
6973 		view_close(log_view);
6974 	else
6975 		*new_view = log_view;
6976 	free(commit_id);
6977 	return err;
6978 }
6979 
6980 static void
6981 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
6982 {
6983 	struct tog_reflist_entry *re;
6984 	int i = 0;
6985 
6986 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
6987 		return;
6988 
6989 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
6990 	while (i++ < maxscroll) {
6991 		if (re == NULL)
6992 			break;
6993 		s->first_displayed_entry = re;
6994 		re = TAILQ_PREV(re, tog_reflist_head, entry);
6995 	}
6996 }
6997 
6998 static const struct got_error *
6999 ref_scroll_down(struct tog_view *view, int maxscroll)
7000 {
7001 	struct tog_ref_view_state *s = &view->state.ref;
7002 	struct tog_reflist_entry *next, *last;
7003 	int n = 0;
7004 
7005 	if (s->first_displayed_entry)
7006 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7007 	else
7008 		next = TAILQ_FIRST(&s->refs);
7009 
7010 	last = s->last_displayed_entry;
7011 	while (next && n++ < maxscroll) {
7012 		if (last)
7013 			last = TAILQ_NEXT(last, entry);
7014 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7015 			s->first_displayed_entry = next;
7016 			next = TAILQ_NEXT(next, entry);
7017 		}
7018 	}
7019 
7020 	return NULL;
7021 }
7022 
7023 static const struct got_error *
7024 search_start_ref_view(struct tog_view *view)
7025 {
7026 	struct tog_ref_view_state *s = &view->state.ref;
7027 
7028 	s->matched_entry = NULL;
7029 	return NULL;
7030 }
7031 
7032 static int
7033 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7034 {
7035 	regmatch_t regmatch;
7036 
7037 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7038 	    0) == 0;
7039 }
7040 
7041 static const struct got_error *
7042 search_next_ref_view(struct tog_view *view)
7043 {
7044 	struct tog_ref_view_state *s = &view->state.ref;
7045 	struct tog_reflist_entry *re = NULL;
7046 
7047 	if (!view->searching) {
7048 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7049 		return NULL;
7050 	}
7051 
7052 	if (s->matched_entry) {
7053 		if (view->searching == TOG_SEARCH_FORWARD) {
7054 			if (s->selected_entry)
7055 				re = TAILQ_NEXT(s->selected_entry, entry);
7056 			else
7057 				re = TAILQ_PREV(s->selected_entry,
7058 				    tog_reflist_head, entry);
7059 		} else {
7060 			if (s->selected_entry == NULL)
7061 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7062 			else
7063 				re = TAILQ_PREV(s->selected_entry,
7064 				    tog_reflist_head, entry);
7065 		}
7066 	} else {
7067 		if (s->selected_entry)
7068 			re = s->selected_entry;
7069 		else if (view->searching == TOG_SEARCH_FORWARD)
7070 			re = TAILQ_FIRST(&s->refs);
7071 		else
7072 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7073 	}
7074 
7075 	while (1) {
7076 		if (re == NULL) {
7077 			if (s->matched_entry == NULL) {
7078 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7079 				return NULL;
7080 			}
7081 			if (view->searching == TOG_SEARCH_FORWARD)
7082 				re = TAILQ_FIRST(&s->refs);
7083 			else
7084 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7085 		}
7086 
7087 		if (match_reflist_entry(re, &view->regex)) {
7088 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7089 			s->matched_entry = re;
7090 			break;
7091 		}
7092 
7093 		if (view->searching == TOG_SEARCH_FORWARD)
7094 			re = TAILQ_NEXT(re, entry);
7095 		else
7096 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7097 	}
7098 
7099 	if (s->matched_entry) {
7100 		s->first_displayed_entry = s->matched_entry;
7101 		s->selected = 0;
7102 	}
7103 
7104 	return NULL;
7105 }
7106 
7107 static const struct got_error *
7108 show_ref_view(struct tog_view *view)
7109 {
7110 	const struct got_error *err = NULL;
7111 	struct tog_ref_view_state *s = &view->state.ref;
7112 	struct tog_reflist_entry *re;
7113 	char *line = NULL;
7114 	wchar_t *wline;
7115 	struct tog_color *tc;
7116 	int width, n;
7117 	int limit = view->nlines;
7118 
7119 	werase(view->window);
7120 
7121 	s->ndisplayed = 0;
7122 	if (view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
7123 	    view_is_splitscreen(view->child))
7124 		--limit;  /* border */
7125 
7126 	if (limit == 0)
7127 		return NULL;
7128 
7129 	re = s->first_displayed_entry;
7130 
7131 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7132 	    s->nrefs) == -1)
7133 		return got_error_from_errno("asprintf");
7134 
7135 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7136 	if (err) {
7137 		free(line);
7138 		return err;
7139 	}
7140 	if (view_needs_focus_indication(view))
7141 		wstandout(view->window);
7142 	waddwstr(view->window, wline);
7143 	if (view_needs_focus_indication(view))
7144 		wstandend(view->window);
7145 	free(wline);
7146 	wline = NULL;
7147 	free(line);
7148 	line = NULL;
7149 	if (width < view->ncols - 1)
7150 		waddch(view->window, '\n');
7151 	if (--limit <= 0)
7152 		return NULL;
7153 
7154 	n = 0;
7155 	while (re && limit > 0) {
7156 		char *line = NULL;
7157 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7158 
7159 		if (s->show_date) {
7160 			struct got_commit_object *ci;
7161 			struct got_tag_object *tag;
7162 			struct got_object_id *id;
7163 			struct tm tm;
7164 			time_t t;
7165 
7166 			err = got_ref_resolve(&id, s->repo, re->ref);
7167 			if (err)
7168 				return err;
7169 			err = got_object_open_as_tag(&tag, s->repo, id);
7170 			if (err) {
7171 				if (err->code != GOT_ERR_OBJ_TYPE) {
7172 					free(id);
7173 					return err;
7174 				}
7175 				err = got_object_open_as_commit(&ci, s->repo,
7176 				    id);
7177 				if (err) {
7178 					free(id);
7179 					return err;
7180 				}
7181 				t = got_object_commit_get_committer_time(ci);
7182 				got_object_commit_close(ci);
7183 			} else {
7184 				t = got_object_tag_get_tagger_time(tag);
7185 				got_object_tag_close(tag);
7186 			}
7187 			free(id);
7188 			if (gmtime_r(&t, &tm) == NULL)
7189 				return got_error_from_errno("gmtime_r");
7190 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7191 				return got_error(GOT_ERR_NO_SPACE);
7192 		}
7193 		if (got_ref_is_symbolic(re->ref)) {
7194 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7195 			    ymd : "", got_ref_get_name(re->ref),
7196 			    got_ref_get_symref_target(re->ref)) == -1)
7197 				return got_error_from_errno("asprintf");
7198 		} else if (s->show_ids) {
7199 			struct got_object_id *id;
7200 			char *id_str;
7201 			err = got_ref_resolve(&id, s->repo, re->ref);
7202 			if (err)
7203 				return err;
7204 			err = got_object_id_str(&id_str, id);
7205 			if (err) {
7206 				free(id);
7207 				return err;
7208 			}
7209 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7210 			    got_ref_get_name(re->ref), id_str) == -1) {
7211 				err = got_error_from_errno("asprintf");
7212 				free(id);
7213 				free(id_str);
7214 				return err;
7215 			}
7216 			free(id);
7217 			free(id_str);
7218 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7219 		    got_ref_get_name(re->ref)) == -1)
7220 			return got_error_from_errno("asprintf");
7221 
7222 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7223 		    0, 0);
7224 		if (err) {
7225 			free(line);
7226 			return err;
7227 		}
7228 		if (n == s->selected) {
7229 			if (view->focussed)
7230 				wstandout(view->window);
7231 			s->selected_entry = re;
7232 		}
7233 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7234 		if (tc)
7235 			wattr_on(view->window,
7236 			    COLOR_PAIR(tc->colorpair), NULL);
7237 		waddwstr(view->window, wline);
7238 		if (tc)
7239 			wattr_off(view->window,
7240 			    COLOR_PAIR(tc->colorpair), NULL);
7241 		if (width < view->ncols - 1)
7242 			waddch(view->window, '\n');
7243 		if (n == s->selected && view->focussed)
7244 			wstandend(view->window);
7245 		free(line);
7246 		free(wline);
7247 		wline = NULL;
7248 		n++;
7249 		s->ndisplayed++;
7250 		s->last_displayed_entry = re;
7251 
7252 		limit--;
7253 		re = TAILQ_NEXT(re, entry);
7254 	}
7255 
7256 	view_border(view);
7257 	return err;
7258 }
7259 
7260 static const struct got_error *
7261 browse_ref_tree(struct tog_view **new_view, int begin_x,
7262     struct tog_reflist_entry *re, struct got_repository *repo)
7263 {
7264 	const struct got_error *err = NULL;
7265 	struct got_object_id *commit_id = NULL;
7266 	struct tog_view *tree_view;
7267 
7268 	*new_view = NULL;
7269 
7270 	err = resolve_reflist_entry(&commit_id, re, repo);
7271 	if (err) {
7272 		if (err->code != GOT_ERR_OBJ_TYPE)
7273 			return err;
7274 		else
7275 			return NULL;
7276 	}
7277 
7278 
7279 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
7280 	if (tree_view == NULL) {
7281 		err = got_error_from_errno("view_open");
7282 		goto done;
7283 	}
7284 
7285 	err = open_tree_view(tree_view, commit_id,
7286 	    got_ref_get_name(re->ref), repo);
7287 	if (err)
7288 		goto done;
7289 
7290 	*new_view = tree_view;
7291 done:
7292 	free(commit_id);
7293 	return err;
7294 }
7295 static const struct got_error *
7296 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7297 {
7298 	const struct got_error *err = NULL;
7299 	struct tog_ref_view_state *s = &view->state.ref;
7300 	struct tog_view *log_view, *tree_view;
7301 	struct tog_reflist_entry *re;
7302 	int begin_y = 0, begin_x = 0, n, nscroll = view->nlines - 1;
7303 
7304 	switch (ch) {
7305 	case 'i':
7306 		s->show_ids = !s->show_ids;
7307 		view->count = 0;
7308 		break;
7309 	case 'm':
7310 		s->show_date = !s->show_date;
7311 		view->count = 0;
7312 		break;
7313 	case 'o':
7314 		s->sort_by_date = !s->sort_by_date;
7315 		view->count = 0;
7316 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7317 		    got_ref_cmp_by_commit_timestamp_descending :
7318 		    tog_ref_cmp_by_name, s->repo);
7319 		if (err)
7320 			break;
7321 		got_reflist_object_id_map_free(tog_refs_idmap);
7322 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7323 		    &tog_refs, s->repo);
7324 		if (err)
7325 			break;
7326 		ref_view_free_refs(s);
7327 		err = ref_view_load_refs(s);
7328 		break;
7329 	case KEY_ENTER:
7330 	case '\r':
7331 		view->count = 0;
7332 		if (!s->selected_entry)
7333 			break;
7334 		if (view_is_parent_view(view))
7335 			view_get_split(view, &begin_y, &begin_x);
7336 
7337 		err = log_ref_entry(&log_view, begin_y, begin_x,
7338 		    s->selected_entry, s->repo);
7339 		if (err)
7340 			break;
7341 
7342 		if (view->mode == TOG_VIEW_SPLIT_HRZN) {
7343 			err = view_init_hsplit(view, begin_y);
7344 			if (err)
7345 				break;
7346 		}
7347 
7348 		view->focussed = 0;
7349 		log_view->focussed = 1;
7350 		log_view->mode = view->mode;
7351 		log_view->nlines = view->lines - begin_y;
7352 		if (view_is_parent_view(view)) {
7353 			err = view_close_child(view);
7354 			if (err)
7355 				return err;
7356 			err = view_set_child(view, log_view);
7357 			if (err)
7358 				return err;
7359 			view->focus_child = 1;
7360 		} else
7361 			*new_view = log_view;
7362 		break;
7363 	case 't':
7364 		view->count = 0;
7365 		if (!s->selected_entry)
7366 			break;
7367 		if (view_is_parent_view(view))
7368 			begin_x = view_split_begin_x(view->begin_x);
7369 		err = browse_ref_tree(&tree_view, begin_x, s->selected_entry,
7370 		    s->repo);
7371 		if (err || tree_view == NULL)
7372 			break;
7373 		view->focussed = 0;
7374 		tree_view->focussed = 1;
7375 		if (view_is_parent_view(view)) {
7376 			err = view_close_child(view);
7377 			if (err)
7378 				return err;
7379 			err = view_set_child(view, tree_view);
7380 			if (err)
7381 				return err;
7382 			view->focus_child = 1;
7383 		} else
7384 			*new_view = tree_view;
7385 		break;
7386 	case 'g':
7387 	case KEY_HOME:
7388 		s->selected = 0;
7389 		view->count = 0;
7390 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7391 		break;
7392 	case 'G':
7393 	case KEY_END: {
7394 		int eos = view->nlines - 1;
7395 
7396 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7397 			--eos;  /* border */
7398 		s->selected = 0;
7399 		view->count = 0;
7400 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7401 		for (n = 0; n < eos; n++) {
7402 			if (re == NULL)
7403 				break;
7404 			s->first_displayed_entry = re;
7405 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7406 		}
7407 		if (n > 0)
7408 			s->selected = n - 1;
7409 		break;
7410 	}
7411 	case 'k':
7412 	case KEY_UP:
7413 	case CTRL('p'):
7414 		if (s->selected > 0) {
7415 			s->selected--;
7416 			break;
7417 		}
7418 		ref_scroll_up(s, 1);
7419 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7420 			view->count = 0;
7421 		break;
7422 	case CTRL('u'):
7423 	case 'u':
7424 		nscroll /= 2;
7425 		/* FALL THROUGH */
7426 	case KEY_PPAGE:
7427 	case CTRL('b'):
7428 	case 'b':
7429 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7430 			s->selected -= MIN(nscroll, s->selected);
7431 		ref_scroll_up(s, MAX(0, nscroll));
7432 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7433 			view->count = 0;
7434 		break;
7435 	case 'j':
7436 	case KEY_DOWN:
7437 	case CTRL('n'):
7438 		if (s->selected < s->ndisplayed - 1) {
7439 			s->selected++;
7440 			break;
7441 		}
7442 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7443 			/* can't scroll any further */
7444 			view->count = 0;
7445 			break;
7446 		}
7447 		ref_scroll_down(view, 1);
7448 		break;
7449 	case CTRL('d'):
7450 	case 'd':
7451 		nscroll /= 2;
7452 		/* FALL THROUGH */
7453 	case KEY_NPAGE:
7454 	case CTRL('f'):
7455 	case 'f':
7456 	case ' ':
7457 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7458 			/* can't scroll any further; move cursor down */
7459 			if (s->selected < s->ndisplayed - 1)
7460 				s->selected += MIN(nscroll,
7461 				    s->ndisplayed - s->selected - 1);
7462 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7463 				s->selected += s->ndisplayed - s->selected - 1;
7464 			view->count = 0;
7465 			break;
7466 		}
7467 		ref_scroll_down(view, nscroll);
7468 		break;
7469 	case CTRL('l'):
7470 		view->count = 0;
7471 		tog_free_refs();
7472 		err = tog_load_refs(s->repo, s->sort_by_date);
7473 		if (err)
7474 			break;
7475 		ref_view_free_refs(s);
7476 		err = ref_view_load_refs(s);
7477 		break;
7478 	case KEY_RESIZE:
7479 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7480 			s->selected = view->nlines - 2;
7481 		break;
7482 	default:
7483 		view->count = 0;
7484 		break;
7485 	}
7486 
7487 	return err;
7488 }
7489 
7490 __dead static void
7491 usage_ref(void)
7492 {
7493 	endwin();
7494 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
7495 	    getprogname());
7496 	exit(1);
7497 }
7498 
7499 static const struct got_error *
7500 cmd_ref(int argc, char *argv[])
7501 {
7502 	const struct got_error *error;
7503 	struct got_repository *repo = NULL;
7504 	struct got_worktree *worktree = NULL;
7505 	char *cwd = NULL, *repo_path = NULL;
7506 	int ch;
7507 	struct tog_view *view;
7508 	int *pack_fds = NULL;
7509 
7510 	while ((ch = getopt(argc, argv, "r:")) != -1) {
7511 		switch (ch) {
7512 		case 'r':
7513 			repo_path = realpath(optarg, NULL);
7514 			if (repo_path == NULL)
7515 				return got_error_from_errno2("realpath",
7516 				    optarg);
7517 			break;
7518 		default:
7519 			usage_ref();
7520 			/* NOTREACHED */
7521 		}
7522 	}
7523 
7524 	argc -= optind;
7525 	argv += optind;
7526 
7527 	if (argc > 1)
7528 		usage_ref();
7529 
7530 	error = got_repo_pack_fds_open(&pack_fds);
7531 	if (error != NULL)
7532 		goto done;
7533 
7534 	if (repo_path == NULL) {
7535 		cwd = getcwd(NULL, 0);
7536 		if (cwd == NULL)
7537 			return got_error_from_errno("getcwd");
7538 		error = got_worktree_open(&worktree, cwd);
7539 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7540 			goto done;
7541 		if (worktree)
7542 			repo_path =
7543 			    strdup(got_worktree_get_repo_path(worktree));
7544 		else
7545 			repo_path = strdup(cwd);
7546 		if (repo_path == NULL) {
7547 			error = got_error_from_errno("strdup");
7548 			goto done;
7549 		}
7550 	}
7551 
7552 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7553 	if (error != NULL)
7554 		goto done;
7555 
7556 	init_curses();
7557 
7558 	error = apply_unveil(got_repo_get_path(repo), NULL);
7559 	if (error)
7560 		goto done;
7561 
7562 	error = tog_load_refs(repo, 0);
7563 	if (error)
7564 		goto done;
7565 
7566 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
7567 	if (view == NULL) {
7568 		error = got_error_from_errno("view_open");
7569 		goto done;
7570 	}
7571 
7572 	error = open_ref_view(view, repo);
7573 	if (error)
7574 		goto done;
7575 
7576 	if (worktree) {
7577 		/* Release work tree lock. */
7578 		got_worktree_close(worktree);
7579 		worktree = NULL;
7580 	}
7581 	error = view_loop(view);
7582 done:
7583 	free(repo_path);
7584 	free(cwd);
7585 	if (repo) {
7586 		const struct got_error *close_err = got_repo_close(repo);
7587 		if (close_err)
7588 			error = close_err;
7589 	}
7590 	if (pack_fds) {
7591 		const struct got_error *pack_err =
7592 		    got_repo_pack_fds_close(pack_fds);
7593 		if (error == NULL)
7594 			error = pack_err;
7595 	}
7596 	tog_free_refs();
7597 	return error;
7598 }
7599 
7600 /*
7601  * If view was scrolled down to move the selected line into view when opening a
7602  * horizontal split, scroll back up when closing the split/toggling fullscreen.
7603  */
7604 static void
7605 offset_selection_up(struct tog_view *view)
7606 {
7607 	switch (view->type) {
7608 	case TOG_VIEW_BLAME: {
7609 		struct tog_blame_view_state *s = &view->state.blame;
7610 		if (s->first_displayed_line == 1) {
7611 			s->selected_line = MAX(s->selected_line - view->offset,
7612 			    1);
7613 			break;
7614 		}
7615 		if (s->first_displayed_line > view->offset)
7616 			s->first_displayed_line -= view->offset;
7617 		else
7618 			s->first_displayed_line = 1;
7619 		s->selected_line += view->offset;
7620 		break;
7621 	}
7622 	case TOG_VIEW_LOG:
7623 		log_scroll_up(&view->state.log, view->offset);
7624 		view->state.log.selected += view->offset;
7625 		break;
7626 	case TOG_VIEW_REF:
7627 		ref_scroll_up(&view->state.ref, view->offset);
7628 		view->state.ref.selected += view->offset;
7629 		break;
7630 	case TOG_VIEW_TREE:
7631 		tree_scroll_up(&view->state.tree, view->offset);
7632 		view->state.tree.selected += view->offset;
7633 		break;
7634 	default:
7635 		break;
7636 	}
7637 
7638 	view->offset = 0;
7639 }
7640 
7641 /*
7642  * If the selected line is in the section of screen covered by the bottom split,
7643  * scroll down offset lines to move it into view and index its new position.
7644  */
7645 static const struct got_error *
7646 offset_selection_down(struct tog_view *view)
7647 {
7648 	const struct got_error	*err = NULL;
7649 	const struct got_error	*(*scrolld)(struct tog_view *, int);
7650 	int			*selected = NULL;
7651 	int			 header, offset;
7652 
7653 	switch (view->type) {
7654 	case TOG_VIEW_BLAME: {
7655 		struct tog_blame_view_state *s = &view->state.blame;
7656 		header = 3;
7657 		scrolld = NULL;
7658 		if (s->selected_line > view->nlines - header) {
7659 			offset = abs(view->nlines - s->selected_line - header);
7660 			s->first_displayed_line += offset;
7661 			s->selected_line -= offset;
7662 			view->offset = offset;
7663 		}
7664 		break;
7665 	}
7666 	case TOG_VIEW_LOG: {
7667 		struct tog_log_view_state *s = &view->state.log;
7668 		scrolld = &log_scroll_down;
7669 		header = 3;
7670 		selected = &s->selected;
7671 		break;
7672 	}
7673 	case TOG_VIEW_REF: {
7674 		struct tog_ref_view_state *s = &view->state.ref;
7675 		scrolld = &ref_scroll_down;
7676 		header = 3;
7677 		selected = &s->selected;
7678 		break;
7679 	}
7680 	case TOG_VIEW_TREE: {
7681 		struct tog_tree_view_state *s = &view->state.tree;
7682 		scrolld = &tree_scroll_down;
7683 		header = 5;
7684 		selected = &s->selected;
7685 		break;
7686 	}
7687 	default:
7688 		selected = NULL;
7689 		scrolld = NULL;
7690 		header = 0;
7691 		break;
7692 	}
7693 
7694 	if (selected && *selected > view->nlines - header) {
7695 		offset = abs(view->nlines - *selected - header);
7696 		view->offset = offset;
7697 		if (scrolld && offset) {
7698 			err = scrolld(view, offset);
7699 			*selected -= offset;
7700 		}
7701 	}
7702 
7703 	return err;
7704 }
7705 
7706 static void
7707 list_commands(FILE *fp)
7708 {
7709 	size_t i;
7710 
7711 	fprintf(fp, "commands:");
7712 	for (i = 0; i < nitems(tog_commands); i++) {
7713 		const struct tog_cmd *cmd = &tog_commands[i];
7714 		fprintf(fp, " %s", cmd->name);
7715 	}
7716 	fputc('\n', fp);
7717 }
7718 
7719 __dead static void
7720 usage(int hflag, int status)
7721 {
7722 	FILE *fp = (status == 0) ? stdout : stderr;
7723 
7724 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
7725 	    getprogname());
7726 	if (hflag) {
7727 		fprintf(fp, "lazy usage: %s path\n", getprogname());
7728 		list_commands(fp);
7729 	}
7730 	exit(status);
7731 }
7732 
7733 static char **
7734 make_argv(int argc, ...)
7735 {
7736 	va_list ap;
7737 	char **argv;
7738 	int i;
7739 
7740 	va_start(ap, argc);
7741 
7742 	argv = calloc(argc, sizeof(char *));
7743 	if (argv == NULL)
7744 		err(1, "calloc");
7745 	for (i = 0; i < argc; i++) {
7746 		argv[i] = strdup(va_arg(ap, char *));
7747 		if (argv[i] == NULL)
7748 			err(1, "strdup");
7749 	}
7750 
7751 	va_end(ap);
7752 	return argv;
7753 }
7754 
7755 /*
7756  * Try to convert 'tog path' into a 'tog log path' command.
7757  * The user could simply have mistyped the command rather than knowingly
7758  * provided a path. So check whether argv[0] can in fact be resolved
7759  * to a path in the HEAD commit and print a special error if not.
7760  * This hack is for mpi@ <3
7761  */
7762 static const struct got_error *
7763 tog_log_with_path(int argc, char *argv[])
7764 {
7765 	const struct got_error *error = NULL, *close_err;
7766 	const struct tog_cmd *cmd = NULL;
7767 	struct got_repository *repo = NULL;
7768 	struct got_worktree *worktree = NULL;
7769 	struct got_object_id *commit_id = NULL, *id = NULL;
7770 	struct got_commit_object *commit = NULL;
7771 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7772 	char *commit_id_str = NULL, **cmd_argv = NULL;
7773 	int *pack_fds = NULL;
7774 
7775 	cwd = getcwd(NULL, 0);
7776 	if (cwd == NULL)
7777 		return got_error_from_errno("getcwd");
7778 
7779 	error = got_repo_pack_fds_open(&pack_fds);
7780 	if (error != NULL)
7781 		goto done;
7782 
7783 	error = got_worktree_open(&worktree, cwd);
7784 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
7785 		goto done;
7786 
7787 	if (worktree)
7788 		repo_path = strdup(got_worktree_get_repo_path(worktree));
7789 	else
7790 		repo_path = strdup(cwd);
7791 	if (repo_path == NULL) {
7792 		error = got_error_from_errno("strdup");
7793 		goto done;
7794 	}
7795 
7796 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7797 	if (error != NULL)
7798 		goto done;
7799 
7800 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7801 	    repo, worktree);
7802 	if (error)
7803 		goto done;
7804 
7805 	error = tog_load_refs(repo, 0);
7806 	if (error)
7807 		goto done;
7808 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
7809 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
7810 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7811 	if (error)
7812 		goto done;
7813 
7814 	if (worktree) {
7815 		got_worktree_close(worktree);
7816 		worktree = NULL;
7817 	}
7818 
7819 	error = got_object_open_as_commit(&commit, repo, commit_id);
7820 	if (error)
7821 		goto done;
7822 
7823 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
7824 	if (error) {
7825 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
7826 			goto done;
7827 		fprintf(stderr, "%s: '%s' is no known command or path\n",
7828 		    getprogname(), argv[0]);
7829 		usage(1, 1);
7830 		/* not reached */
7831 	}
7832 
7833 	close_err = got_repo_close(repo);
7834 	if (error == NULL)
7835 		error = close_err;
7836 	repo = NULL;
7837 
7838 	error = got_object_id_str(&commit_id_str, commit_id);
7839 	if (error)
7840 		goto done;
7841 
7842 	cmd = &tog_commands[0]; /* log */
7843 	argc = 4;
7844 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
7845 	error = cmd->cmd_main(argc, cmd_argv);
7846 done:
7847 	if (repo) {
7848 		close_err = got_repo_close(repo);
7849 		if (error == NULL)
7850 			error = close_err;
7851 	}
7852 	if (commit)
7853 		got_object_commit_close(commit);
7854 	if (worktree)
7855 		got_worktree_close(worktree);
7856 	if (pack_fds) {
7857 		const struct got_error *pack_err =
7858 		    got_repo_pack_fds_close(pack_fds);
7859 		if (error == NULL)
7860 			error = pack_err;
7861 	}
7862 	free(id);
7863 	free(commit_id_str);
7864 	free(commit_id);
7865 	free(cwd);
7866 	free(repo_path);
7867 	free(in_repo_path);
7868 	if (cmd_argv) {
7869 		int i;
7870 		for (i = 0; i < argc; i++)
7871 			free(cmd_argv[i]);
7872 		free(cmd_argv);
7873 	}
7874 	tog_free_refs();
7875 	return error;
7876 }
7877 
7878 int
7879 main(int argc, char *argv[])
7880 {
7881 	const struct got_error *error = NULL;
7882 	const struct tog_cmd *cmd = NULL;
7883 	int ch, hflag = 0, Vflag = 0;
7884 	char **cmd_argv = NULL;
7885 	static const struct option longopts[] = {
7886 	    { "version", no_argument, NULL, 'V' },
7887 	    { NULL, 0, NULL, 0}
7888 	};
7889 	char *diff_algo_str = NULL;
7890 
7891 	setlocale(LC_CTYPE, "");
7892 
7893 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
7894 		switch (ch) {
7895 		case 'h':
7896 			hflag = 1;
7897 			break;
7898 		case 'V':
7899 			Vflag = 1;
7900 			break;
7901 		default:
7902 			usage(hflag, 1);
7903 			/* NOTREACHED */
7904 		}
7905 	}
7906 
7907 	argc -= optind;
7908 	argv += optind;
7909 	optind = 1;
7910 	optreset = 1;
7911 
7912 	if (Vflag) {
7913 		got_version_print_str();
7914 		return 0;
7915 	}
7916 
7917 #ifndef PROFILE
7918 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
7919 	    NULL) == -1)
7920 		err(1, "pledge");
7921 #endif
7922 
7923 	if (argc == 0) {
7924 		if (hflag)
7925 			usage(hflag, 0);
7926 		/* Build an argument vector which runs a default command. */
7927 		cmd = &tog_commands[0];
7928 		argc = 1;
7929 		cmd_argv = make_argv(argc, cmd->name);
7930 	} else {
7931 		size_t i;
7932 
7933 		/* Did the user specify a command? */
7934 		for (i = 0; i < nitems(tog_commands); i++) {
7935 			if (strncmp(tog_commands[i].name, argv[0],
7936 			    strlen(argv[0])) == 0) {
7937 				cmd = &tog_commands[i];
7938 				break;
7939 			}
7940 		}
7941 	}
7942 
7943 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
7944 	if (diff_algo_str) {
7945 		if (strcasecmp(diff_algo_str, "patience") == 0)
7946 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
7947 		if (strcasecmp(diff_algo_str, "myers") == 0)
7948 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
7949 	}
7950 
7951 	if (cmd == NULL) {
7952 		if (argc != 1)
7953 			usage(0, 1);
7954 		/* No command specified; try log with a path */
7955 		error = tog_log_with_path(argc, argv);
7956 	} else {
7957 		if (hflag)
7958 			cmd->cmd_usage();
7959 		else
7960 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
7961 	}
7962 
7963 	endwin();
7964 	putchar('\n');
7965 	if (cmd_argv) {
7966 		int i;
7967 		for (i = 0; i < argc; i++)
7968 			free(cmd_argv[i]);
7969 		free(cmd_argv);
7970 	}
7971 
7972 	if (error && error->code != GOT_ERR_CANCELLED)
7973 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
7974 	return 0;
7975 }