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