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