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