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 struct tog_diff_view_state {
317 	struct got_object_id *id1, *id2;
318 	const char *label1, *label2;
319 	FILE *f, *f1, *f2;
320 	int fd1, fd2;
321 	int lineno;
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 got_diff_line *lines;
330 	size_t nlines;
331 	int matched_line;
332 	int selected_line;
333 
334 	/* passed from log or blame view; may be NULL */
335 	struct tog_view *parent_view;
336 };
337 
338 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
339 static volatile sig_atomic_t tog_thread_error;
340 
341 struct tog_log_thread_args {
342 	pthread_cond_t need_commits;
343 	pthread_cond_t commit_loaded;
344 	int commits_needed;
345 	int load_all;
346 	struct got_commit_graph *graph;
347 	struct commit_queue *real_commits;
348 	const char *in_repo_path;
349 	struct got_object_id *start_id;
350 	struct got_repository *repo;
351 	int *pack_fds;
352 	int log_complete;
353 	sig_atomic_t *quit;
354 	struct commit_queue_entry **first_displayed_entry;
355 	struct commit_queue_entry **selected_entry;
356 	int *searching;
357 	int *search_next_done;
358 	regex_t *regex;
359 	int *limiting;
360 	int limit_match;
361 	regex_t *limit_regex;
362 	struct commit_queue *limit_commits;
363 };
364 
365 struct tog_log_view_state {
366 	struct commit_queue *commits;
367 	struct commit_queue_entry *first_displayed_entry;
368 	struct commit_queue_entry *last_displayed_entry;
369 	struct commit_queue_entry *selected_entry;
370 	struct commit_queue real_commits;
371 	int selected;
372 	char *in_repo_path;
373 	char *head_ref_name;
374 	int log_branches;
375 	struct got_repository *repo;
376 	struct got_object_id *start_id;
377 	sig_atomic_t quit;
378 	pthread_t thread;
379 	struct tog_log_thread_args thread_args;
380 	struct commit_queue_entry *matched_entry;
381 	struct commit_queue_entry *search_entry;
382 	struct tog_colors colors;
383 	int use_committer;
384 	int limit_view;
385 	regex_t limit_regex;
386 	struct commit_queue limit_commits;
387 };
388 
389 #define TOG_COLOR_DIFF_MINUS		1
390 #define TOG_COLOR_DIFF_PLUS		2
391 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
392 #define TOG_COLOR_DIFF_META		4
393 #define TOG_COLOR_TREE_SUBMODULE	5
394 #define TOG_COLOR_TREE_SYMLINK		6
395 #define TOG_COLOR_TREE_DIRECTORY	7
396 #define TOG_COLOR_TREE_EXECUTABLE	8
397 #define TOG_COLOR_COMMIT		9
398 #define TOG_COLOR_AUTHOR		10
399 #define TOG_COLOR_DATE			11
400 #define TOG_COLOR_REFS_HEADS		12
401 #define TOG_COLOR_REFS_TAGS		13
402 #define TOG_COLOR_REFS_REMOTES		14
403 #define TOG_COLOR_REFS_BACKUP		15
404 
405 struct tog_blame_cb_args {
406 	struct tog_blame_line *lines; /* one per line */
407 	int nlines;
408 
409 	struct tog_view *view;
410 	struct got_object_id *commit_id;
411 	int *quit;
412 };
413 
414 struct tog_blame_thread_args {
415 	const char *path;
416 	struct got_repository *repo;
417 	struct tog_blame_cb_args *cb_args;
418 	int *complete;
419 	got_cancel_cb cancel_cb;
420 	void *cancel_arg;
421 };
422 
423 struct tog_blame {
424 	FILE *f;
425 	off_t filesize;
426 	struct tog_blame_line *lines;
427 	int nlines;
428 	off_t *line_offsets;
429 	pthread_t thread;
430 	struct tog_blame_thread_args thread_args;
431 	struct tog_blame_cb_args cb_args;
432 	const char *path;
433 	int *pack_fds;
434 };
435 
436 struct tog_blame_view_state {
437 	int first_displayed_line;
438 	int last_displayed_line;
439 	int selected_line;
440 	int last_diffed_line;
441 	int blame_complete;
442 	int eof;
443 	int done;
444 	struct got_object_id_queue blamed_commits;
445 	struct got_object_qid *blamed_commit;
446 	char *path;
447 	struct got_repository *repo;
448 	struct got_object_id *commit_id;
449 	struct got_object_id *id_to_log;
450 	struct tog_blame blame;
451 	int matched_line;
452 	struct tog_colors colors;
453 };
454 
455 struct tog_parent_tree {
456 	TAILQ_ENTRY(tog_parent_tree) entry;
457 	struct got_tree_object *tree;
458 	struct got_tree_entry *first_displayed_entry;
459 	struct got_tree_entry *selected_entry;
460 	int selected;
461 };
462 
463 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
464 
465 struct tog_tree_view_state {
466 	char *tree_label;
467 	struct got_object_id *commit_id;/* commit which this tree belongs to */
468 	struct got_tree_object *root;	/* the commit's root tree entry */
469 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
470 	struct got_tree_entry *first_displayed_entry;
471 	struct got_tree_entry *last_displayed_entry;
472 	struct got_tree_entry *selected_entry;
473 	int ndisplayed, selected, show_ids;
474 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
475 	char *head_ref_name;
476 	struct got_repository *repo;
477 	struct got_tree_entry *matched_entry;
478 	struct tog_colors colors;
479 };
480 
481 struct tog_reflist_entry {
482 	TAILQ_ENTRY(tog_reflist_entry) entry;
483 	struct got_reference *ref;
484 	int idx;
485 };
486 
487 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
488 
489 struct tog_ref_view_state {
490 	struct tog_reflist_head refs;
491 	struct tog_reflist_entry *first_displayed_entry;
492 	struct tog_reflist_entry *last_displayed_entry;
493 	struct tog_reflist_entry *selected_entry;
494 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
495 	struct got_repository *repo;
496 	struct tog_reflist_entry *matched_entry;
497 	struct tog_colors colors;
498 };
499 
500 /*
501  * We implement two types of views: parent views and child views.
502  *
503  * The 'Tab' key switches focus between a parent view and its child view.
504  * Child views are shown side-by-side to their parent view, provided
505  * there is enough screen estate.
506  *
507  * When a new view is opened from within a parent view, this new view
508  * becomes a child view of the parent view, replacing any existing child.
509  *
510  * When a new view is opened from within a child view, this new view
511  * becomes a parent view which will obscure the views below until the
512  * user quits the new parent view by typing 'q'.
513  *
514  * This list of views contains parent views only.
515  * Child views are only pointed to by their parent view.
516  */
517 TAILQ_HEAD(tog_view_list_head, tog_view);
518 
519 struct tog_view {
520 	TAILQ_ENTRY(tog_view) entry;
521 	WINDOW *window;
522 	PANEL *panel;
523 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
524 	int resized_y, resized_x; /* begin_y/x based on user resizing */
525 	int maxx, x; /* max column and current start column */
526 	int lines, cols; /* copies of LINES and COLS */
527 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
528 	int gline, hiline; /* navigate to and highlight this nG line */
529 	int ch, count; /* current keymap and count prefix */
530 	int resized; /* set when in a resize event */
531 	int focussed; /* Only set on one parent or child view at a time. */
532 	int dying;
533 	struct tog_view *parent;
534 	struct tog_view *child;
535 
536 	/*
537 	 * This flag is initially set on parent views when a new child view
538 	 * is created. It gets toggled when the 'Tab' key switches focus
539 	 * between parent and child.
540 	 * The flag indicates whether focus should be passed on to our child
541 	 * view if this parent view gets picked for focus after another parent
542 	 * view was closed. This prevents child views from losing focus in such
543 	 * situations.
544 	 */
545 	int focus_child;
546 
547 	enum tog_view_mode mode;
548 	/* type-specific state */
549 	enum tog_view_type type;
550 	union {
551 		struct tog_diff_view_state diff;
552 		struct tog_log_view_state log;
553 		struct tog_blame_view_state blame;
554 		struct tog_tree_view_state tree;
555 		struct tog_ref_view_state ref;
556 	} state;
557 
558 	const struct got_error *(*show)(struct tog_view *);
559 	const struct got_error *(*input)(struct tog_view **,
560 	    struct tog_view *, int);
561 	const struct got_error *(*reset)(struct tog_view *);
562 	const struct got_error *(*resize)(struct tog_view *, int);
563 	const struct got_error *(*close)(struct tog_view *);
564 
565 	const struct got_error *(*search_start)(struct tog_view *);
566 	const struct got_error *(*search_next)(struct tog_view *);
567 	int search_started;
568 	int searching;
569 #define TOG_SEARCH_FORWARD	1
570 #define TOG_SEARCH_BACKWARD	2
571 	int search_next_done;
572 #define TOG_SEARCH_HAVE_MORE	1
573 #define TOG_SEARCH_NO_MORE	2
574 #define TOG_SEARCH_HAVE_NONE	3
575 	regex_t regex;
576 	regmatch_t regmatch;
577 };
578 
579 static const struct got_error *open_diff_view(struct tog_view *,
580     struct got_object_id *, struct got_object_id *,
581     const char *, const char *, int, int, int, struct tog_view *,
582     struct got_repository *);
583 static const struct got_error *show_diff_view(struct tog_view *);
584 static const struct got_error *input_diff_view(struct tog_view **,
585     struct tog_view *, int);
586 static const struct got_error *reset_diff_view(struct tog_view *);
587 static const struct got_error* close_diff_view(struct tog_view *);
588 static const struct got_error *search_start_diff_view(struct tog_view *);
589 static const struct got_error *search_next_diff_view(struct tog_view *);
590 
591 static const struct got_error *open_log_view(struct tog_view *,
592     struct got_object_id *, struct got_repository *,
593     const char *, const char *, int);
594 static const struct got_error * show_log_view(struct tog_view *);
595 static const struct got_error *input_log_view(struct tog_view **,
596     struct tog_view *, int);
597 static const struct got_error *resize_log_view(struct tog_view *, int);
598 static const struct got_error *close_log_view(struct tog_view *);
599 static const struct got_error *search_start_log_view(struct tog_view *);
600 static const struct got_error *search_next_log_view(struct tog_view *);
601 
602 static const struct got_error *open_blame_view(struct tog_view *, char *,
603     struct got_object_id *, struct got_repository *);
604 static const struct got_error *show_blame_view(struct tog_view *);
605 static const struct got_error *input_blame_view(struct tog_view **,
606     struct tog_view *, int);
607 static const struct got_error *reset_blame_view(struct tog_view *);
608 static const struct got_error *close_blame_view(struct tog_view *);
609 static const struct got_error *search_start_blame_view(struct tog_view *);
610 static const struct got_error *search_next_blame_view(struct tog_view *);
611 
612 static const struct got_error *open_tree_view(struct tog_view *,
613     struct got_object_id *, const char *, struct got_repository *);
614 static const struct got_error *show_tree_view(struct tog_view *);
615 static const struct got_error *input_tree_view(struct tog_view **,
616     struct tog_view *, int);
617 static const struct got_error *close_tree_view(struct tog_view *);
618 static const struct got_error *search_start_tree_view(struct tog_view *);
619 static const struct got_error *search_next_tree_view(struct tog_view *);
620 
621 static const struct got_error *open_ref_view(struct tog_view *,
622     struct got_repository *);
623 static const struct got_error *show_ref_view(struct tog_view *);
624 static const struct got_error *input_ref_view(struct tog_view **,
625     struct tog_view *, int);
626 static const struct got_error *close_ref_view(struct tog_view *);
627 static const struct got_error *search_start_ref_view(struct tog_view *);
628 static const struct got_error *search_next_ref_view(struct tog_view *);
629 
630 static volatile sig_atomic_t tog_sigwinch_received;
631 static volatile sig_atomic_t tog_sigpipe_received;
632 static volatile sig_atomic_t tog_sigcont_received;
633 static volatile sig_atomic_t tog_sigint_received;
634 static volatile sig_atomic_t tog_sigterm_received;
635 
636 static void
637 tog_sigwinch(int signo)
638 {
639 	tog_sigwinch_received = 1;
640 }
641 
642 static void
643 tog_sigpipe(int signo)
644 {
645 	tog_sigpipe_received = 1;
646 }
647 
648 static void
649 tog_sigcont(int signo)
650 {
651 	tog_sigcont_received = 1;
652 }
653 
654 static void
655 tog_sigint(int signo)
656 {
657 	tog_sigint_received = 1;
658 }
659 
660 static void
661 tog_sigterm(int signo)
662 {
663 	tog_sigterm_received = 1;
664 }
665 
666 static int
667 tog_fatal_signal_received(void)
668 {
669 	return (tog_sigpipe_received ||
670 	    tog_sigint_received || tog_sigint_received);
671 }
672 
673 static const struct got_error *
674 view_close(struct tog_view *view)
675 {
676 	const struct got_error *err = NULL, *child_err = NULL;
677 
678 	if (view->child) {
679 		child_err = view_close(view->child);
680 		view->child = NULL;
681 	}
682 	if (view->close)
683 		err = view->close(view);
684 	if (view->panel)
685 		del_panel(view->panel);
686 	if (view->window)
687 		delwin(view->window);
688 	free(view);
689 	return err ? err : child_err;
690 }
691 
692 static struct tog_view *
693 view_open(int nlines, int ncols, int begin_y, int begin_x,
694     enum tog_view_type type)
695 {
696 	struct tog_view *view = calloc(1, sizeof(*view));
697 
698 	if (view == NULL)
699 		return NULL;
700 
701 	view->type = type;
702 	view->lines = LINES;
703 	view->cols = COLS;
704 	view->nlines = nlines ? nlines : LINES - begin_y;
705 	view->ncols = ncols ? ncols : COLS - begin_x;
706 	view->begin_y = begin_y;
707 	view->begin_x = begin_x;
708 	view->window = newwin(nlines, ncols, begin_y, begin_x);
709 	if (view->window == NULL) {
710 		view_close(view);
711 		return NULL;
712 	}
713 	view->panel = new_panel(view->window);
714 	if (view->panel == NULL ||
715 	    set_panel_userptr(view->panel, view) != OK) {
716 		view_close(view);
717 		return NULL;
718 	}
719 
720 	keypad(view->window, TRUE);
721 	return view;
722 }
723 
724 static int
725 view_split_begin_x(int begin_x)
726 {
727 	if (begin_x > 0 || COLS < 120)
728 		return 0;
729 	return (COLS - MAX(COLS / 2, 80));
730 }
731 
732 /* XXX Stub till we decide what to do. */
733 static int
734 view_split_begin_y(int lines)
735 {
736 	return lines * HSPLIT_SCALE;
737 }
738 
739 static const struct got_error *view_resize(struct tog_view *);
740 
741 static const struct got_error *
742 view_splitscreen(struct tog_view *view)
743 {
744 	const struct got_error *err = NULL;
745 
746 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
747 		if (view->resized_y && view->resized_y < view->lines)
748 			view->begin_y = view->resized_y;
749 		else
750 			view->begin_y = view_split_begin_y(view->nlines);
751 		view->begin_x = 0;
752 	} else if (!view->resized) {
753 		if (view->resized_x && view->resized_x < view->cols - 1 &&
754 		    view->cols > 119)
755 			view->begin_x = view->resized_x;
756 		else
757 			view->begin_x = view_split_begin_x(0);
758 		view->begin_y = 0;
759 	}
760 	view->nlines = LINES - view->begin_y;
761 	view->ncols = COLS - view->begin_x;
762 	view->lines = LINES;
763 	view->cols = COLS;
764 	err = view_resize(view);
765 	if (err)
766 		return err;
767 
768 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
769 		view->parent->nlines = view->begin_y;
770 
771 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
772 		return got_error_from_errno("mvwin");
773 
774 	return NULL;
775 }
776 
777 static const struct got_error *
778 view_fullscreen(struct tog_view *view)
779 {
780 	const struct got_error *err = NULL;
781 
782 	view->begin_x = 0;
783 	view->begin_y = view->resized ? view->begin_y : 0;
784 	view->nlines = view->resized ? view->nlines : LINES;
785 	view->ncols = COLS;
786 	view->lines = LINES;
787 	view->cols = COLS;
788 	err = view_resize(view);
789 	if (err)
790 		return err;
791 
792 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
793 		return got_error_from_errno("mvwin");
794 
795 	return NULL;
796 }
797 
798 static int
799 view_is_parent_view(struct tog_view *view)
800 {
801 	return view->parent == NULL;
802 }
803 
804 static int
805 view_is_splitscreen(struct tog_view *view)
806 {
807 	return view->begin_x > 0 || view->begin_y > 0;
808 }
809 
810 static int
811 view_is_fullscreen(struct tog_view *view)
812 {
813 	return view->nlines == LINES && view->ncols == COLS;
814 }
815 
816 static int
817 view_is_hsplit_top(struct tog_view *view)
818 {
819 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
820 	    view_is_splitscreen(view->child);
821 }
822 
823 static void
824 view_border(struct tog_view *view)
825 {
826 	PANEL *panel;
827 	const struct tog_view *view_above;
828 
829 	if (view->parent)
830 		return view_border(view->parent);
831 
832 	panel = panel_above(view->panel);
833 	if (panel == NULL)
834 		return;
835 
836 	view_above = panel_userptr(panel);
837 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
838 		mvwhline(view->window, view_above->begin_y - 1,
839 		    view->begin_x, got_locale_is_utf8() ?
840 		    ACS_HLINE : '-', view->ncols);
841 	else
842 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
843 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
844 }
845 
846 static const struct got_error *view_init_hsplit(struct tog_view *, int);
847 static const struct got_error *request_log_commits(struct tog_view *);
848 static const struct got_error *offset_selection_down(struct tog_view *);
849 static void offset_selection_up(struct tog_view *);
850 static void view_get_split(struct tog_view *, int *, int *);
851 
852 static const struct got_error *
853 view_resize(struct tog_view *view)
854 {
855 	const struct got_error	*err = NULL;
856 	int			 dif, nlines, ncols;
857 
858 	dif = LINES - view->lines;  /* line difference */
859 
860 	if (view->lines > LINES)
861 		nlines = view->nlines - (view->lines - LINES);
862 	else
863 		nlines = view->nlines + (LINES - view->lines);
864 	if (view->cols > COLS)
865 		ncols = view->ncols - (view->cols - COLS);
866 	else
867 		ncols = view->ncols + (COLS - view->cols);
868 
869 	if (view->child) {
870 		int hs = view->child->begin_y;
871 
872 		if (!view_is_fullscreen(view))
873 			view->child->begin_x = view_split_begin_x(view->begin_x);
874 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
875 		    view->child->begin_x == 0) {
876 			ncols = COLS;
877 
878 			view_fullscreen(view->child);
879 			if (view->child->focussed)
880 				show_panel(view->child->panel);
881 			else
882 				show_panel(view->panel);
883 		} else {
884 			ncols = view->child->begin_x;
885 
886 			view_splitscreen(view->child);
887 			show_panel(view->child->panel);
888 		}
889 		/*
890 		 * XXX This is ugly and needs to be moved into the above
891 		 * logic but "works" for now and my attempts at moving it
892 		 * break either 'tab' or 'F' key maps in horizontal splits.
893 		 */
894 		if (hs) {
895 			err = view_splitscreen(view->child);
896 			if (err)
897 				return err;
898 			if (dif < 0) { /* top split decreased */
899 				err = offset_selection_down(view);
900 				if (err)
901 					return err;
902 			}
903 			view_border(view);
904 			update_panels();
905 			doupdate();
906 			show_panel(view->child->panel);
907 			nlines = view->nlines;
908 		}
909 	} else if (view->parent == NULL)
910 		ncols = COLS;
911 
912 	if (view->resize && dif > 0) {
913 		err = view->resize(view, dif);
914 		if (err)
915 			return err;
916 	}
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 const struct got_error *
933 resize_log_view(struct tog_view *view, int increase)
934 {
935 	struct tog_log_view_state	*s = &view->state.log;
936 	const struct got_error		*err = NULL;
937 	int				 n = 0;
938 
939 	if (s->selected_entry)
940 		n = s->selected_entry->idx + view->lines - s->selected;
941 
942 	/*
943 	 * Request commits to account for the increased
944 	 * height so we have enough to populate the view.
945 	 */
946 	if (s->commits->ncommits < n) {
947 		view->nscrolled = n - s->commits->ncommits + increase + 1;
948 		err = request_log_commits(view);
949 	}
950 
951 	return err;
952 }
953 
954 static void
955 view_adjust_offset(struct tog_view *view, int n)
956 {
957 	if (n == 0)
958 		return;
959 
960 	if (view->parent && view->parent->offset) {
961 		if (view->parent->offset + n >= 0)
962 			view->parent->offset += n;
963 		else
964 			view->parent->offset = 0;
965 	} else if (view->offset) {
966 		if (view->offset - n >= 0)
967 			view->offset -= n;
968 		else
969 			view->offset = 0;
970 	}
971 }
972 
973 static const struct got_error *
974 view_resize_split(struct tog_view *view, int resize)
975 {
976 	const struct got_error	*err = NULL;
977 	struct tog_view		*v = NULL;
978 
979 	if (view->parent)
980 		v = view->parent;
981 	else
982 		v = view;
983 
984 	if (!v->child || !view_is_splitscreen(v->child))
985 		return NULL;
986 
987 	v->resized = v->child->resized = resize;  /* lock for resize event */
988 
989 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
990 		if (v->child->resized_y)
991 			v->child->begin_y = v->child->resized_y;
992 		if (view->parent)
993 			v->child->begin_y -= resize;
994 		else
995 			v->child->begin_y += resize;
996 		if (v->child->begin_y < 3) {
997 			view->count = 0;
998 			v->child->begin_y = 3;
999 		} else if (v->child->begin_y > LINES - 1) {
1000 			view->count = 0;
1001 			v->child->begin_y = LINES - 1;
1002 		}
1003 		v->ncols = COLS;
1004 		v->child->ncols = COLS;
1005 		view_adjust_offset(view, resize);
1006 		err = view_init_hsplit(v, v->child->begin_y);
1007 		if (err)
1008 			return err;
1009 		v->child->resized_y = v->child->begin_y;
1010 	} else {
1011 		if (v->child->resized_x)
1012 			v->child->begin_x = v->child->resized_x;
1013 		if (view->parent)
1014 			v->child->begin_x -= resize;
1015 		else
1016 			v->child->begin_x += resize;
1017 		if (v->child->begin_x < 11) {
1018 			view->count = 0;
1019 			v->child->begin_x = 11;
1020 		} else if (v->child->begin_x > COLS - 1) {
1021 			view->count = 0;
1022 			v->child->begin_x = COLS - 1;
1023 		}
1024 		v->child->resized_x = v->child->begin_x;
1025 	}
1026 
1027 	v->child->mode = v->mode;
1028 	v->child->nlines = v->lines - v->child->begin_y;
1029 	v->child->ncols = v->cols - v->child->begin_x;
1030 	v->focus_child = 1;
1031 
1032 	err = view_fullscreen(v);
1033 	if (err)
1034 		return err;
1035 	err = view_splitscreen(v->child);
1036 	if (err)
1037 		return err;
1038 
1039 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1040 		err = offset_selection_down(v->child);
1041 		if (err)
1042 			return err;
1043 	}
1044 
1045 	if (v->resize)
1046 		err = v->resize(v, 0);
1047 	else if (v->child->resize)
1048 		err = v->child->resize(v->child, 0);
1049 
1050 	v->resized = v->child->resized = 0;
1051 
1052 	return err;
1053 }
1054 
1055 static void
1056 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1057 {
1058 	struct tog_view *v = src->child ? src->child : src;
1059 
1060 	dst->resized_x = v->resized_x;
1061 	dst->resized_y = v->resized_y;
1062 }
1063 
1064 static const struct got_error *
1065 view_close_child(struct tog_view *view)
1066 {
1067 	const struct got_error *err = NULL;
1068 
1069 	if (view->child == NULL)
1070 		return NULL;
1071 
1072 	err = view_close(view->child);
1073 	view->child = NULL;
1074 	return err;
1075 }
1076 
1077 static const struct got_error *
1078 view_set_child(struct tog_view *view, struct tog_view *child)
1079 {
1080 	const struct got_error *err = NULL;
1081 
1082 	view->child = child;
1083 	child->parent = view;
1084 
1085 	err = view_resize(view);
1086 	if (err)
1087 		return err;
1088 
1089 	if (view->child->resized_x || view->child->resized_y)
1090 		err = view_resize_split(view, 0);
1091 
1092 	return err;
1093 }
1094 
1095 static const struct got_error *view_dispatch_request(struct tog_view **,
1096     struct tog_view *, enum tog_view_type, int, int);
1097 
1098 static const struct got_error *
1099 view_request_new(struct tog_view **requested, struct tog_view *view,
1100     enum tog_view_type request)
1101 {
1102 	struct tog_view		*new_view = NULL;
1103 	const struct got_error	*err;
1104 	int			 y = 0, x = 0;
1105 
1106 	*requested = NULL;
1107 
1108 	if (view_is_parent_view(view))
1109 		view_get_split(view, &y, &x);
1110 
1111 	err = view_dispatch_request(&new_view, view, request, y, x);
1112 	if (err)
1113 		return err;
1114 
1115 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1116 		err = view_init_hsplit(view, y);
1117 		if (err)
1118 			return err;
1119 	}
1120 
1121 	view->focussed = 0;
1122 	new_view->focussed = 1;
1123 	new_view->mode = view->mode;
1124 	new_view->nlines = view->lines - y;
1125 
1126 	if (view_is_parent_view(view)) {
1127 		view_transfer_size(new_view, view);
1128 		err = view_close_child(view);
1129 		if (err)
1130 			return err;
1131 		err = view_set_child(view, new_view);
1132 		if (err)
1133 			return err;
1134 		view->focus_child = 1;
1135 	} else
1136 		*requested = new_view;
1137 
1138 	return NULL;
1139 }
1140 
1141 static void
1142 tog_resizeterm(void)
1143 {
1144 	int cols, lines;
1145 	struct winsize size;
1146 
1147 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1148 		cols = 80;     /* Default */
1149 		lines = 24;
1150 	} else {
1151 		cols = size.ws_col;
1152 		lines = size.ws_row;
1153 	}
1154 	resize_term(lines, cols);
1155 }
1156 
1157 static const struct got_error *
1158 view_search_start(struct tog_view *view)
1159 {
1160 	const struct got_error *err = NULL;
1161 	struct tog_view *v = view;
1162 	char pattern[1024];
1163 	int ret;
1164 
1165 	if (view->search_started) {
1166 		regfree(&view->regex);
1167 		view->searching = 0;
1168 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1169 	}
1170 	view->search_started = 0;
1171 
1172 	if (view->nlines < 1)
1173 		return NULL;
1174 
1175 	if (view_is_hsplit_top(view))
1176 		v = view->child;
1177 
1178 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1179 	wclrtoeol(v->window);
1180 
1181 	nodelay(view->window, FALSE);  /* block for search term input */
1182 	nocbreak();
1183 	echo();
1184 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1185 	wrefresh(v->window);
1186 	cbreak();
1187 	noecho();
1188 	nodelay(view->window, TRUE);
1189 	if (ret == ERR)
1190 		return NULL;
1191 
1192 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1193 		err = view->search_start(view);
1194 		if (err) {
1195 			regfree(&view->regex);
1196 			return err;
1197 		}
1198 		view->search_started = 1;
1199 		view->searching = TOG_SEARCH_FORWARD;
1200 		view->search_next_done = 0;
1201 		view->search_next(view);
1202 	}
1203 
1204 	return NULL;
1205 }
1206 
1207 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1208 static const struct got_error *
1209 switch_split(struct tog_view *view)
1210 {
1211 	const struct got_error	*err = NULL;
1212 	struct tog_view		*v = NULL;
1213 
1214 	if (view->parent)
1215 		v = view->parent;
1216 	else
1217 		v = view;
1218 
1219 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1220 		v->mode = TOG_VIEW_SPLIT_VERT;
1221 	else
1222 		v->mode = TOG_VIEW_SPLIT_HRZN;
1223 
1224 	if (!v->child)
1225 		return NULL;
1226 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1227 		v->mode = TOG_VIEW_SPLIT_NONE;
1228 
1229 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1230 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1231 		v->child->begin_y = v->child->resized_y;
1232 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1233 		v->child->begin_x = v->child->resized_x;
1234 
1235 
1236 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1237 		v->ncols = COLS;
1238 		v->child->ncols = COLS;
1239 		v->child->nscrolled = LINES - v->child->nlines;
1240 
1241 		err = view_init_hsplit(v, v->child->begin_y);
1242 		if (err)
1243 			return err;
1244 	}
1245 	v->child->mode = v->mode;
1246 	v->child->nlines = v->lines - v->child->begin_y;
1247 	v->focus_child = 1;
1248 
1249 	err = view_fullscreen(v);
1250 	if (err)
1251 		return err;
1252 	err = view_splitscreen(v->child);
1253 	if (err)
1254 		return err;
1255 
1256 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1257 		v->mode = TOG_VIEW_SPLIT_VERT;
1258 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1259 		err = offset_selection_down(v);
1260 		if (err)
1261 			return err;
1262 		err = offset_selection_down(v->child);
1263 		if (err)
1264 			return err;
1265 	} else {
1266 		offset_selection_up(v);
1267 		offset_selection_up(v->child);
1268 	}
1269 	if (v->resize)
1270 		err = v->resize(v, 0);
1271 	else if (v->child->resize)
1272 		err = v->child->resize(v->child, 0);
1273 
1274 	return err;
1275 }
1276 
1277 /*
1278  * Compute view->count from numeric input. Assign total to view->count and
1279  * return first non-numeric key entered.
1280  */
1281 static int
1282 get_compound_key(struct tog_view *view, int c)
1283 {
1284 	struct tog_view	*v = view;
1285 	int		 x, n = 0;
1286 
1287 	if (view_is_hsplit_top(view))
1288 		v = view->child;
1289 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1290 		v = view->parent;
1291 
1292 	view->count = 0;
1293 	cbreak();  /* block for input */
1294 	nodelay(view->window, FALSE);
1295 	wmove(v->window, v->nlines - 1, 0);
1296 	wclrtoeol(v->window);
1297 	waddch(v->window, ':');
1298 
1299 	do {
1300 		x = getcurx(v->window);
1301 		if (x != ERR && x < view->ncols) {
1302 			waddch(v->window, c);
1303 			wrefresh(v->window);
1304 		}
1305 
1306 		/*
1307 		 * Don't overflow. Max valid request should be the greatest
1308 		 * between the longest and total lines; cap at 10 million.
1309 		 */
1310 		if (n >= 9999999)
1311 			n = 9999999;
1312 		else
1313 			n = n * 10 + (c - '0');
1314 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1315 
1316 	if (c == 'G' || c == 'g') {	/* nG key map */
1317 		view->gline = view->hiline = n;
1318 		n = 0;
1319 		c = 0;
1320 	}
1321 
1322 	/* Massage excessive or inapplicable values at the input handler. */
1323 	view->count = n;
1324 
1325 	return c;
1326 }
1327 
1328 static const struct got_error *
1329 view_input(struct tog_view **new, int *done, struct tog_view *view,
1330     struct tog_view_list_head *views)
1331 {
1332 	const struct got_error *err = NULL;
1333 	struct tog_view *v;
1334 	int ch, errcode;
1335 
1336 	*new = NULL;
1337 
1338 	/* Clear "no matches" indicator. */
1339 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1340 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1341 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1342 		view->count = 0;
1343 	}
1344 
1345 	if (view->searching && !view->search_next_done) {
1346 		errcode = pthread_mutex_unlock(&tog_mutex);
1347 		if (errcode)
1348 			return got_error_set_errno(errcode,
1349 			    "pthread_mutex_unlock");
1350 		sched_yield();
1351 		errcode = pthread_mutex_lock(&tog_mutex);
1352 		if (errcode)
1353 			return got_error_set_errno(errcode,
1354 			    "pthread_mutex_lock");
1355 		view->search_next(view);
1356 		return NULL;
1357 	}
1358 
1359 	/* Allow threads to make progress while we are waiting for input. */
1360 	errcode = pthread_mutex_unlock(&tog_mutex);
1361 	if (errcode)
1362 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1363 	/* If we have an unfinished count, let C-g or backspace abort. */
1364 	if (view->count && --view->count) {
1365 		cbreak();
1366 		nodelay(view->window, TRUE);
1367 		ch = wgetch(view->window);
1368 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1369 			view->count = 0;
1370 		else
1371 			ch = view->ch;
1372 	} else {
1373 		ch = wgetch(view->window);
1374 		if (ch >= '1' && ch  <= '9')
1375 			view->ch = ch = get_compound_key(view, ch);
1376 	}
1377 	if (view->hiline && ch != ERR && ch != 0)
1378 		view->hiline = 0;  /* key pressed, clear line highlight */
1379 	nodelay(view->window, TRUE);
1380 	errcode = pthread_mutex_lock(&tog_mutex);
1381 	if (errcode)
1382 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1383 
1384 	if (tog_sigwinch_received || tog_sigcont_received) {
1385 		tog_resizeterm();
1386 		tog_sigwinch_received = 0;
1387 		tog_sigcont_received = 0;
1388 		TAILQ_FOREACH(v, views, entry) {
1389 			err = view_resize(v);
1390 			if (err)
1391 				return err;
1392 			err = v->input(new, v, KEY_RESIZE);
1393 			if (err)
1394 				return err;
1395 			if (v->child) {
1396 				err = view_resize(v->child);
1397 				if (err)
1398 					return err;
1399 				err = v->child->input(new, v->child,
1400 				    KEY_RESIZE);
1401 				if (err)
1402 					return err;
1403 				if (v->child->resized_x || v->child->resized_y) {
1404 					err = view_resize_split(v, 0);
1405 					if (err)
1406 						return err;
1407 				}
1408 			}
1409 		}
1410 	}
1411 
1412 	switch (ch) {
1413 	case '\t':
1414 		view->count = 0;
1415 		if (view->child) {
1416 			view->focussed = 0;
1417 			view->child->focussed = 1;
1418 			view->focus_child = 1;
1419 		} else if (view->parent) {
1420 			view->focussed = 0;
1421 			view->parent->focussed = 1;
1422 			view->parent->focus_child = 0;
1423 			if (!view_is_splitscreen(view)) {
1424 				if (view->parent->resize) {
1425 					err = view->parent->resize(view->parent,
1426 					    0);
1427 					if (err)
1428 						return err;
1429 				}
1430 				offset_selection_up(view->parent);
1431 				err = view_fullscreen(view->parent);
1432 				if (err)
1433 					return err;
1434 			}
1435 		}
1436 		break;
1437 	case 'q':
1438 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1439 			if (view->parent->resize) {
1440 				/* might need more commits to fill fullscreen */
1441 				err = view->parent->resize(view->parent, 0);
1442 				if (err)
1443 					break;
1444 			}
1445 			offset_selection_up(view->parent);
1446 		}
1447 		err = view->input(new, view, ch);
1448 		view->dying = 1;
1449 		break;
1450 	case 'Q':
1451 		*done = 1;
1452 		break;
1453 	case 'F':
1454 		view->count = 0;
1455 		if (view_is_parent_view(view)) {
1456 			if (view->child == NULL)
1457 				break;
1458 			if (view_is_splitscreen(view->child)) {
1459 				view->focussed = 0;
1460 				view->child->focussed = 1;
1461 				err = view_fullscreen(view->child);
1462 			} else {
1463 				err = view_splitscreen(view->child);
1464 				if (!err)
1465 					err = view_resize_split(view, 0);
1466 			}
1467 			if (err)
1468 				break;
1469 			err = view->child->input(new, view->child,
1470 			    KEY_RESIZE);
1471 		} else {
1472 			if (view_is_splitscreen(view)) {
1473 				view->parent->focussed = 0;
1474 				view->focussed = 1;
1475 				err = view_fullscreen(view);
1476 			} else {
1477 				err = view_splitscreen(view);
1478 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1479 					err = view_resize(view->parent);
1480 				if (!err)
1481 					err = view_resize_split(view, 0);
1482 			}
1483 			if (err)
1484 				break;
1485 			err = view->input(new, view, KEY_RESIZE);
1486 		}
1487 		if (err)
1488 			break;
1489 		if (view->resize) {
1490 			err = view->resize(view, 0);
1491 			if (err)
1492 				break;
1493 		}
1494 		if (view->parent)
1495 			err = offset_selection_down(view->parent);
1496 		if (!err)
1497 			err = offset_selection_down(view);
1498 		break;
1499 	case 'S':
1500 		view->count = 0;
1501 		err = switch_split(view);
1502 		break;
1503 	case '-':
1504 		err = view_resize_split(view, -1);
1505 		break;
1506 	case '+':
1507 		err = view_resize_split(view, 1);
1508 		break;
1509 	case KEY_RESIZE:
1510 		break;
1511 	case '/':
1512 		view->count = 0;
1513 		if (view->search_start)
1514 			view_search_start(view);
1515 		else
1516 			err = view->input(new, view, ch);
1517 		break;
1518 	case 'N':
1519 	case 'n':
1520 		if (view->search_started && view->search_next) {
1521 			view->searching = (ch == 'n' ?
1522 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1523 			view->search_next_done = 0;
1524 			view->search_next(view);
1525 		} else
1526 			err = view->input(new, view, ch);
1527 		break;
1528 	case 'A':
1529 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1530 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1531 		else
1532 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1533 		TAILQ_FOREACH(v, views, entry) {
1534 			if (v->reset) {
1535 				err = v->reset(v);
1536 				if (err)
1537 					return err;
1538 			}
1539 			if (v->child && v->child->reset) {
1540 				err = v->child->reset(v->child);
1541 				if (err)
1542 					return err;
1543 			}
1544 		}
1545 		break;
1546 	default:
1547 		err = view->input(new, view, ch);
1548 		break;
1549 	}
1550 
1551 	return err;
1552 }
1553 
1554 static int
1555 view_needs_focus_indication(struct tog_view *view)
1556 {
1557 	if (view_is_parent_view(view)) {
1558 		if (view->child == NULL || view->child->focussed)
1559 			return 0;
1560 		if (!view_is_splitscreen(view->child))
1561 			return 0;
1562 	} else if (!view_is_splitscreen(view))
1563 		return 0;
1564 
1565 	return view->focussed;
1566 }
1567 
1568 static const struct got_error *
1569 view_loop(struct tog_view *view)
1570 {
1571 	const struct got_error *err = NULL;
1572 	struct tog_view_list_head views;
1573 	struct tog_view *new_view;
1574 	char *mode;
1575 	int fast_refresh = 10;
1576 	int done = 0, errcode;
1577 
1578 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1579 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1580 		view->mode = TOG_VIEW_SPLIT_VERT;
1581 	else
1582 		view->mode = TOG_VIEW_SPLIT_HRZN;
1583 
1584 	errcode = pthread_mutex_lock(&tog_mutex);
1585 	if (errcode)
1586 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1587 
1588 	TAILQ_INIT(&views);
1589 	TAILQ_INSERT_HEAD(&views, view, entry);
1590 
1591 	view->focussed = 1;
1592 	err = view->show(view);
1593 	if (err)
1594 		return err;
1595 	update_panels();
1596 	doupdate();
1597 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1598 	    !tog_fatal_signal_received()) {
1599 		/* Refresh fast during initialization, then become slower. */
1600 		if (fast_refresh && fast_refresh-- == 0)
1601 			halfdelay(10); /* switch to once per second */
1602 
1603 		err = view_input(&new_view, &done, view, &views);
1604 		if (err)
1605 			break;
1606 		if (view->dying) {
1607 			struct tog_view *v, *prev = NULL;
1608 
1609 			if (view_is_parent_view(view))
1610 				prev = TAILQ_PREV(view, tog_view_list_head,
1611 				    entry);
1612 			else if (view->parent)
1613 				prev = view->parent;
1614 
1615 			if (view->parent) {
1616 				view->parent->child = NULL;
1617 				view->parent->focus_child = 0;
1618 				/* Restore fullscreen line height. */
1619 				view->parent->nlines = view->parent->lines;
1620 				err = view_resize(view->parent);
1621 				if (err)
1622 					break;
1623 				/* Make resized splits persist. */
1624 				view_transfer_size(view->parent, view);
1625 			} else
1626 				TAILQ_REMOVE(&views, view, entry);
1627 
1628 			err = view_close(view);
1629 			if (err)
1630 				goto done;
1631 
1632 			view = NULL;
1633 			TAILQ_FOREACH(v, &views, entry) {
1634 				if (v->focussed)
1635 					break;
1636 			}
1637 			if (view == NULL && new_view == NULL) {
1638 				/* No view has focus. Try to pick one. */
1639 				if (prev)
1640 					view = prev;
1641 				else if (!TAILQ_EMPTY(&views)) {
1642 					view = TAILQ_LAST(&views,
1643 					    tog_view_list_head);
1644 				}
1645 				if (view) {
1646 					if (view->focus_child) {
1647 						view->child->focussed = 1;
1648 						view = view->child;
1649 					} else
1650 						view->focussed = 1;
1651 				}
1652 			}
1653 		}
1654 		if (new_view) {
1655 			struct tog_view *v, *t;
1656 			/* Only allow one parent view per type. */
1657 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1658 				if (v->type != new_view->type)
1659 					continue;
1660 				TAILQ_REMOVE(&views, v, entry);
1661 				err = view_close(v);
1662 				if (err)
1663 					goto done;
1664 				break;
1665 			}
1666 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1667 			view = new_view;
1668 		}
1669 		if (view) {
1670 			if (view_is_parent_view(view)) {
1671 				if (view->child && view->child->focussed)
1672 					view = view->child;
1673 			} else {
1674 				if (view->parent && view->parent->focussed)
1675 					view = view->parent;
1676 			}
1677 			show_panel(view->panel);
1678 			if (view->child && view_is_splitscreen(view->child))
1679 				show_panel(view->child->panel);
1680 			if (view->parent && view_is_splitscreen(view)) {
1681 				err = view->parent->show(view->parent);
1682 				if (err)
1683 					goto done;
1684 			}
1685 			err = view->show(view);
1686 			if (err)
1687 				goto done;
1688 			if (view->child) {
1689 				err = view->child->show(view->child);
1690 				if (err)
1691 					goto done;
1692 			}
1693 			update_panels();
1694 			doupdate();
1695 		}
1696 	}
1697 done:
1698 	while (!TAILQ_EMPTY(&views)) {
1699 		const struct got_error *close_err;
1700 		view = TAILQ_FIRST(&views);
1701 		TAILQ_REMOVE(&views, view, entry);
1702 		close_err = view_close(view);
1703 		if (close_err && err == NULL)
1704 			err = close_err;
1705 	}
1706 
1707 	errcode = pthread_mutex_unlock(&tog_mutex);
1708 	if (errcode && err == NULL)
1709 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1710 
1711 	return err;
1712 }
1713 
1714 __dead static void
1715 usage_log(void)
1716 {
1717 	endwin();
1718 	fprintf(stderr,
1719 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1720 	    getprogname());
1721 	exit(1);
1722 }
1723 
1724 /* Create newly allocated wide-character string equivalent to a byte string. */
1725 static const struct got_error *
1726 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1727 {
1728 	char *vis = NULL;
1729 	const struct got_error *err = NULL;
1730 
1731 	*ws = NULL;
1732 	*wlen = mbstowcs(NULL, s, 0);
1733 	if (*wlen == (size_t)-1) {
1734 		int vislen;
1735 		if (errno != EILSEQ)
1736 			return got_error_from_errno("mbstowcs");
1737 
1738 		/* byte string invalid in current encoding; try to "fix" it */
1739 		err = got_mbsavis(&vis, &vislen, s);
1740 		if (err)
1741 			return err;
1742 		*wlen = mbstowcs(NULL, vis, 0);
1743 		if (*wlen == (size_t)-1) {
1744 			err = got_error_from_errno("mbstowcs"); /* give up */
1745 			goto done;
1746 		}
1747 	}
1748 
1749 	*ws = calloc(*wlen + 1, sizeof(**ws));
1750 	if (*ws == NULL) {
1751 		err = got_error_from_errno("calloc");
1752 		goto done;
1753 	}
1754 
1755 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1756 		err = got_error_from_errno("mbstowcs");
1757 done:
1758 	free(vis);
1759 	if (err) {
1760 		free(*ws);
1761 		*ws = NULL;
1762 		*wlen = 0;
1763 	}
1764 	return err;
1765 }
1766 
1767 static const struct got_error *
1768 expand_tab(char **ptr, const char *src)
1769 {
1770 	char	*dst;
1771 	size_t	 len, n, idx = 0, sz = 0;
1772 
1773 	*ptr = NULL;
1774 	n = len = strlen(src);
1775 	dst = malloc(n + 1);
1776 	if (dst == NULL)
1777 		return got_error_from_errno("malloc");
1778 
1779 	while (idx < len && src[idx]) {
1780 		const char c = src[idx];
1781 
1782 		if (c == '\t') {
1783 			size_t nb = TABSIZE - sz % TABSIZE;
1784 			char *p;
1785 
1786 			p = realloc(dst, n + nb);
1787 			if (p == NULL) {
1788 				free(dst);
1789 				return got_error_from_errno("realloc");
1790 
1791 			}
1792 			dst = p;
1793 			n += nb;
1794 			memset(dst + sz, ' ', nb);
1795 			sz += nb;
1796 		} else
1797 			dst[sz++] = src[idx];
1798 		++idx;
1799 	}
1800 
1801 	dst[sz] = '\0';
1802 	*ptr = dst;
1803 	return NULL;
1804 }
1805 
1806 /*
1807  * Advance at most n columns from wline starting at offset off.
1808  * Return the index to the first character after the span operation.
1809  * Return the combined column width of all spanned wide character in
1810  * *rcol.
1811  */
1812 static int
1813 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1814 {
1815 	int width, i, cols = 0;
1816 
1817 	if (n == 0) {
1818 		*rcol = cols;
1819 		return off;
1820 	}
1821 
1822 	for (i = off; wline[i] != L'\0'; ++i) {
1823 		if (wline[i] == L'\t')
1824 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1825 		else
1826 			width = wcwidth(wline[i]);
1827 
1828 		if (width == -1) {
1829 			width = 1;
1830 			wline[i] = L'.';
1831 		}
1832 
1833 		if (cols + width > n)
1834 			break;
1835 		cols += width;
1836 	}
1837 
1838 	*rcol = cols;
1839 	return i;
1840 }
1841 
1842 /*
1843  * Format a line for display, ensuring that it won't overflow a width limit.
1844  * With scrolling, the width returned refers to the scrolled version of the
1845  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1846  */
1847 static const struct got_error *
1848 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1849     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1850 {
1851 	const struct got_error *err = NULL;
1852 	int cols;
1853 	wchar_t *wline = NULL;
1854 	char *exstr = NULL;
1855 	size_t wlen;
1856 	int i, scrollx;
1857 
1858 	*wlinep = NULL;
1859 	*widthp = 0;
1860 
1861 	if (expand) {
1862 		err = expand_tab(&exstr, line);
1863 		if (err)
1864 			return err;
1865 	}
1866 
1867 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1868 	free(exstr);
1869 	if (err)
1870 		return err;
1871 
1872 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1873 
1874 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1875 		wline[wlen - 1] = L'\0';
1876 		wlen--;
1877 	}
1878 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1879 		wline[wlen - 1] = L'\0';
1880 		wlen--;
1881 	}
1882 
1883 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1884 	wline[i] = L'\0';
1885 
1886 	if (widthp)
1887 		*widthp = cols;
1888 	if (scrollxp)
1889 		*scrollxp = scrollx;
1890 	if (err)
1891 		free(wline);
1892 	else
1893 		*wlinep = wline;
1894 	return err;
1895 }
1896 
1897 static const struct got_error*
1898 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1899     struct got_object_id *id, struct got_repository *repo)
1900 {
1901 	static const struct got_error *err = NULL;
1902 	struct got_reflist_entry *re;
1903 	char *s;
1904 	const char *name;
1905 
1906 	*refs_str = NULL;
1907 
1908 	TAILQ_FOREACH(re, refs, entry) {
1909 		struct got_tag_object *tag = NULL;
1910 		struct got_object_id *ref_id;
1911 		int cmp;
1912 
1913 		name = got_ref_get_name(re->ref);
1914 		if (strcmp(name, GOT_REF_HEAD) == 0)
1915 			continue;
1916 		if (strncmp(name, "refs/", 5) == 0)
1917 			name += 5;
1918 		if (strncmp(name, "got/", 4) == 0 &&
1919 		    strncmp(name, "got/backup/", 11) != 0)
1920 			continue;
1921 		if (strncmp(name, "heads/", 6) == 0)
1922 			name += 6;
1923 		if (strncmp(name, "remotes/", 8) == 0) {
1924 			name += 8;
1925 			s = strstr(name, "/" GOT_REF_HEAD);
1926 			if (s != NULL && s[strlen(s)] == '\0')
1927 				continue;
1928 		}
1929 		err = got_ref_resolve(&ref_id, repo, re->ref);
1930 		if (err)
1931 			break;
1932 		if (strncmp(name, "tags/", 5) == 0) {
1933 			err = got_object_open_as_tag(&tag, repo, ref_id);
1934 			if (err) {
1935 				if (err->code != GOT_ERR_OBJ_TYPE) {
1936 					free(ref_id);
1937 					break;
1938 				}
1939 				/* Ref points at something other than a tag. */
1940 				err = NULL;
1941 				tag = NULL;
1942 			}
1943 		}
1944 		cmp = got_object_id_cmp(tag ?
1945 		    got_object_tag_get_object_id(tag) : ref_id, id);
1946 		free(ref_id);
1947 		if (tag)
1948 			got_object_tag_close(tag);
1949 		if (cmp != 0)
1950 			continue;
1951 		s = *refs_str;
1952 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1953 		    s ? ", " : "", name) == -1) {
1954 			err = got_error_from_errno("asprintf");
1955 			free(s);
1956 			*refs_str = NULL;
1957 			break;
1958 		}
1959 		free(s);
1960 	}
1961 
1962 	return err;
1963 }
1964 
1965 static const struct got_error *
1966 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1967     int col_tab_align)
1968 {
1969 	char *smallerthan;
1970 
1971 	smallerthan = strchr(author, '<');
1972 	if (smallerthan && smallerthan[1] != '\0')
1973 		author = smallerthan + 1;
1974 	author[strcspn(author, "@>")] = '\0';
1975 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1976 	    col_tab_align, 0);
1977 }
1978 
1979 static const struct got_error *
1980 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1981     struct got_object_id *id, const size_t date_display_cols,
1982     int author_display_cols)
1983 {
1984 	struct tog_log_view_state *s = &view->state.log;
1985 	const struct got_error *err = NULL;
1986 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1987 	char *logmsg0 = NULL, *logmsg = NULL;
1988 	char *author = NULL;
1989 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1990 	int author_width, logmsg_width;
1991 	char *newline, *line = NULL;
1992 	int col, limit, scrollx;
1993 	const int avail = view->ncols;
1994 	struct tm tm;
1995 	time_t committer_time;
1996 	struct tog_color *tc;
1997 
1998 	committer_time = got_object_commit_get_committer_time(commit);
1999 	if (gmtime_r(&committer_time, &tm) == NULL)
2000 		return got_error_from_errno("gmtime_r");
2001 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2002 		return got_error(GOT_ERR_NO_SPACE);
2003 
2004 	if (avail <= date_display_cols)
2005 		limit = MIN(sizeof(datebuf) - 1, avail);
2006 	else
2007 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2008 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2009 	if (tc)
2010 		wattr_on(view->window,
2011 		    COLOR_PAIR(tc->colorpair), NULL);
2012 	waddnstr(view->window, datebuf, limit);
2013 	if (tc)
2014 		wattr_off(view->window,
2015 		    COLOR_PAIR(tc->colorpair), NULL);
2016 	col = limit;
2017 	if (col > avail)
2018 		goto done;
2019 
2020 	if (avail >= 120) {
2021 		char *id_str;
2022 		err = got_object_id_str(&id_str, id);
2023 		if (err)
2024 			goto done;
2025 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2026 		if (tc)
2027 			wattr_on(view->window,
2028 			    COLOR_PAIR(tc->colorpair), NULL);
2029 		wprintw(view->window, "%.8s ", id_str);
2030 		if (tc)
2031 			wattr_off(view->window,
2032 			    COLOR_PAIR(tc->colorpair), NULL);
2033 		free(id_str);
2034 		col += 9;
2035 		if (col > avail)
2036 			goto done;
2037 	}
2038 
2039 	if (s->use_committer)
2040 		author = strdup(got_object_commit_get_committer(commit));
2041 	else
2042 		author = strdup(got_object_commit_get_author(commit));
2043 	if (author == NULL) {
2044 		err = got_error_from_errno("strdup");
2045 		goto done;
2046 	}
2047 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2048 	if (err)
2049 		goto done;
2050 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2051 	if (tc)
2052 		wattr_on(view->window,
2053 		    COLOR_PAIR(tc->colorpair), NULL);
2054 	waddwstr(view->window, wauthor);
2055 	col += author_width;
2056 	while (col < avail && author_width < author_display_cols + 2) {
2057 		waddch(view->window, ' ');
2058 		col++;
2059 		author_width++;
2060 	}
2061 	if (tc)
2062 		wattr_off(view->window,
2063 		    COLOR_PAIR(tc->colorpair), NULL);
2064 	if (col > avail)
2065 		goto done;
2066 
2067 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2068 	if (err)
2069 		goto done;
2070 	logmsg = logmsg0;
2071 	while (*logmsg == '\n')
2072 		logmsg++;
2073 	newline = strchr(logmsg, '\n');
2074 	if (newline)
2075 		*newline = '\0';
2076 	limit = avail - col;
2077 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2078 		limit--;	/* for the border */
2079 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2080 	    limit, col, 1);
2081 	if (err)
2082 		goto done;
2083 	waddwstr(view->window, &wlogmsg[scrollx]);
2084 	col += MAX(logmsg_width, 0);
2085 	while (col < avail) {
2086 		waddch(view->window, ' ');
2087 		col++;
2088 	}
2089 done:
2090 	free(logmsg0);
2091 	free(wlogmsg);
2092 	free(author);
2093 	free(wauthor);
2094 	free(line);
2095 	return err;
2096 }
2097 
2098 static struct commit_queue_entry *
2099 alloc_commit_queue_entry(struct got_commit_object *commit,
2100     struct got_object_id *id)
2101 {
2102 	struct commit_queue_entry *entry;
2103 	struct got_object_id *dup;
2104 
2105 	entry = calloc(1, sizeof(*entry));
2106 	if (entry == NULL)
2107 		return NULL;
2108 
2109 	dup = got_object_id_dup(id);
2110 	if (dup == NULL) {
2111 		free(entry);
2112 		return NULL;
2113 	}
2114 
2115 	entry->id = dup;
2116 	entry->commit = commit;
2117 	return entry;
2118 }
2119 
2120 static void
2121 pop_commit(struct commit_queue *commits)
2122 {
2123 	struct commit_queue_entry *entry;
2124 
2125 	entry = TAILQ_FIRST(&commits->head);
2126 	TAILQ_REMOVE(&commits->head, entry, entry);
2127 	got_object_commit_close(entry->commit);
2128 	commits->ncommits--;
2129 	free(entry->id);
2130 	free(entry);
2131 }
2132 
2133 static void
2134 free_commits(struct commit_queue *commits)
2135 {
2136 	while (!TAILQ_EMPTY(&commits->head))
2137 		pop_commit(commits);
2138 }
2139 
2140 static const struct got_error *
2141 match_commit(int *have_match, struct got_object_id *id,
2142     struct got_commit_object *commit, regex_t *regex)
2143 {
2144 	const struct got_error *err = NULL;
2145 	regmatch_t regmatch;
2146 	char *id_str = NULL, *logmsg = NULL;
2147 
2148 	*have_match = 0;
2149 
2150 	err = got_object_id_str(&id_str, id);
2151 	if (err)
2152 		return err;
2153 
2154 	err = got_object_commit_get_logmsg(&logmsg, commit);
2155 	if (err)
2156 		goto done;
2157 
2158 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2159 	    &regmatch, 0) == 0 ||
2160 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2161 	    &regmatch, 0) == 0 ||
2162 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2163 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2164 		*have_match = 1;
2165 done:
2166 	free(id_str);
2167 	free(logmsg);
2168 	return err;
2169 }
2170 
2171 static const struct got_error *
2172 queue_commits(struct tog_log_thread_args *a)
2173 {
2174 	const struct got_error *err = NULL;
2175 
2176 	/*
2177 	 * We keep all commits open throughout the lifetime of the log
2178 	 * view in order to avoid having to re-fetch commits from disk
2179 	 * while updating the display.
2180 	 */
2181 	do {
2182 		struct got_object_id id;
2183 		struct got_commit_object *commit;
2184 		struct commit_queue_entry *entry;
2185 		int limit_match = 0;
2186 		int errcode;
2187 
2188 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2189 		    NULL, NULL);
2190 		if (err)
2191 			break;
2192 
2193 		err = got_object_open_as_commit(&commit, a->repo, &id);
2194 		if (err)
2195 			break;
2196 		entry = alloc_commit_queue_entry(commit, &id);
2197 		if (entry == NULL) {
2198 			err = got_error_from_errno("alloc_commit_queue_entry");
2199 			break;
2200 		}
2201 
2202 		errcode = pthread_mutex_lock(&tog_mutex);
2203 		if (errcode) {
2204 			err = got_error_set_errno(errcode,
2205 			    "pthread_mutex_lock");
2206 			break;
2207 		}
2208 
2209 		entry->idx = a->real_commits->ncommits;
2210 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2211 		a->real_commits->ncommits++;
2212 
2213 		if (*a->limiting) {
2214 			err = match_commit(&limit_match, &id, commit,
2215 			    a->limit_regex);
2216 			if (err)
2217 				break;
2218 
2219 			if (limit_match) {
2220 				struct commit_queue_entry *matched;
2221 
2222 				matched = alloc_commit_queue_entry(
2223 				    entry->commit, entry->id);
2224 				if (matched == NULL) {
2225 					err = got_error_from_errno(
2226 					    "alloc_commit_queue_entry");
2227 					break;
2228 				}
2229 
2230 				err = got_object_commit_dup(&matched->commit,
2231 				    entry->commit);
2232 				if (err)
2233 					break;
2234 
2235 				matched->idx = a->limit_commits->ncommits;
2236 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2237 				    matched, entry);
2238 				a->limit_commits->ncommits++;
2239 			}
2240 
2241 			/*
2242 			 * This is how we signal log_thread() that we
2243 			 * have found a match, and that it should be
2244 			 * counted as a new entry for the view.
2245 			 */
2246 			a->limit_match = limit_match;
2247 		}
2248 
2249 		if (*a->searching == TOG_SEARCH_FORWARD &&
2250 		    !*a->search_next_done) {
2251 			int have_match;
2252 			err = match_commit(&have_match, &id, commit, a->regex);
2253 			if (err)
2254 				break;
2255 
2256 			if (*a->limiting) {
2257 				if (limit_match && have_match)
2258 					*a->search_next_done =
2259 					    TOG_SEARCH_HAVE_MORE;
2260 			} else if (have_match)
2261 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2262 		}
2263 
2264 		errcode = pthread_mutex_unlock(&tog_mutex);
2265 		if (errcode && err == NULL)
2266 			err = got_error_set_errno(errcode,
2267 			    "pthread_mutex_unlock");
2268 		if (err)
2269 			break;
2270 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2271 
2272 	return err;
2273 }
2274 
2275 static void
2276 select_commit(struct tog_log_view_state *s)
2277 {
2278 	struct commit_queue_entry *entry;
2279 	int ncommits = 0;
2280 
2281 	entry = s->first_displayed_entry;
2282 	while (entry) {
2283 		if (ncommits == s->selected) {
2284 			s->selected_entry = entry;
2285 			break;
2286 		}
2287 		entry = TAILQ_NEXT(entry, entry);
2288 		ncommits++;
2289 	}
2290 }
2291 
2292 static const struct got_error *
2293 draw_commits(struct tog_view *view)
2294 {
2295 	const struct got_error *err = NULL;
2296 	struct tog_log_view_state *s = &view->state.log;
2297 	struct commit_queue_entry *entry = s->selected_entry;
2298 	int limit = view->nlines;
2299 	int width;
2300 	int ncommits, author_cols = 4;
2301 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2302 	char *refs_str = NULL;
2303 	wchar_t *wline;
2304 	struct tog_color *tc;
2305 	static const size_t date_display_cols = 12;
2306 
2307 	if (view_is_hsplit_top(view))
2308 		--limit;  /* account for border */
2309 
2310 	if (s->selected_entry &&
2311 	    !(view->searching && view->search_next_done == 0)) {
2312 		struct got_reflist_head *refs;
2313 		err = got_object_id_str(&id_str, s->selected_entry->id);
2314 		if (err)
2315 			return err;
2316 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2317 		    s->selected_entry->id);
2318 		if (refs) {
2319 			err = build_refs_str(&refs_str, refs,
2320 			    s->selected_entry->id, s->repo);
2321 			if (err)
2322 				goto done;
2323 		}
2324 	}
2325 
2326 	if (s->thread_args.commits_needed == 0)
2327 		halfdelay(10); /* disable fast refresh */
2328 
2329 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2330 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2331 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2332 		    (view->searching && !view->search_next_done) ?
2333 		    "searching..." : "loading...") == -1) {
2334 			err = got_error_from_errno("asprintf");
2335 			goto done;
2336 		}
2337 	} else {
2338 		const char *search_str = NULL;
2339 		const char *limit_str = NULL;
2340 
2341 		if (view->searching) {
2342 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2343 				search_str = "no more matches";
2344 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2345 				search_str = "no matches found";
2346 			else if (!view->search_next_done)
2347 				search_str = "searching...";
2348 		}
2349 
2350 		if (s->limit_view && s->commits->ncommits == 0)
2351 			limit_str = "no matches found";
2352 
2353 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2354 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2355 		    search_str ? search_str : (refs_str ? refs_str : ""),
2356 		    limit_str ? limit_str : "") == -1) {
2357 			err = got_error_from_errno("asprintf");
2358 			goto done;
2359 		}
2360 	}
2361 
2362 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2363 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2364 		    "........................................",
2365 		    s->in_repo_path, ncommits_str) == -1) {
2366 			err = got_error_from_errno("asprintf");
2367 			header = NULL;
2368 			goto done;
2369 		}
2370 	} else if (asprintf(&header, "commit %s%s",
2371 	    id_str ? id_str : "........................................",
2372 	    ncommits_str) == -1) {
2373 		err = got_error_from_errno("asprintf");
2374 		header = NULL;
2375 		goto done;
2376 	}
2377 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2378 	if (err)
2379 		goto done;
2380 
2381 	werase(view->window);
2382 
2383 	if (view_needs_focus_indication(view))
2384 		wstandout(view->window);
2385 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2386 	if (tc)
2387 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2388 	waddwstr(view->window, wline);
2389 	while (width < view->ncols) {
2390 		waddch(view->window, ' ');
2391 		width++;
2392 	}
2393 	if (tc)
2394 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2395 	if (view_needs_focus_indication(view))
2396 		wstandend(view->window);
2397 	free(wline);
2398 	if (limit <= 1)
2399 		goto done;
2400 
2401 	/* Grow author column size if necessary, and set view->maxx. */
2402 	entry = s->first_displayed_entry;
2403 	ncommits = 0;
2404 	view->maxx = 0;
2405 	while (entry) {
2406 		struct got_commit_object *c = entry->commit;
2407 		char *author, *eol, *msg, *msg0;
2408 		wchar_t *wauthor, *wmsg;
2409 		int width;
2410 		if (ncommits >= limit - 1)
2411 			break;
2412 		if (s->use_committer)
2413 			author = strdup(got_object_commit_get_committer(c));
2414 		else
2415 			author = strdup(got_object_commit_get_author(c));
2416 		if (author == NULL) {
2417 			err = got_error_from_errno("strdup");
2418 			goto done;
2419 		}
2420 		err = format_author(&wauthor, &width, author, COLS,
2421 		    date_display_cols);
2422 		if (author_cols < width)
2423 			author_cols = width;
2424 		free(wauthor);
2425 		free(author);
2426 		if (err)
2427 			goto done;
2428 		err = got_object_commit_get_logmsg(&msg0, c);
2429 		if (err)
2430 			goto done;
2431 		msg = msg0;
2432 		while (*msg == '\n')
2433 			++msg;
2434 		if ((eol = strchr(msg, '\n')))
2435 			*eol = '\0';
2436 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2437 		    date_display_cols + author_cols, 0);
2438 		if (err)
2439 			goto done;
2440 		view->maxx = MAX(view->maxx, width);
2441 		free(msg0);
2442 		free(wmsg);
2443 		ncommits++;
2444 		entry = TAILQ_NEXT(entry, entry);
2445 	}
2446 
2447 	entry = s->first_displayed_entry;
2448 	s->last_displayed_entry = s->first_displayed_entry;
2449 	ncommits = 0;
2450 	while (entry) {
2451 		if (ncommits >= limit - 1)
2452 			break;
2453 		if (ncommits == s->selected)
2454 			wstandout(view->window);
2455 		err = draw_commit(view, entry->commit, entry->id,
2456 		    date_display_cols, author_cols);
2457 		if (ncommits == s->selected)
2458 			wstandend(view->window);
2459 		if (err)
2460 			goto done;
2461 		ncommits++;
2462 		s->last_displayed_entry = entry;
2463 		entry = TAILQ_NEXT(entry, entry);
2464 	}
2465 
2466 	view_border(view);
2467 done:
2468 	free(id_str);
2469 	free(refs_str);
2470 	free(ncommits_str);
2471 	free(header);
2472 	return err;
2473 }
2474 
2475 static void
2476 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2477 {
2478 	struct commit_queue_entry *entry;
2479 	int nscrolled = 0;
2480 
2481 	entry = TAILQ_FIRST(&s->commits->head);
2482 	if (s->first_displayed_entry == entry)
2483 		return;
2484 
2485 	entry = s->first_displayed_entry;
2486 	while (entry && nscrolled < maxscroll) {
2487 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2488 		if (entry) {
2489 			s->first_displayed_entry = entry;
2490 			nscrolled++;
2491 		}
2492 	}
2493 }
2494 
2495 static const struct got_error *
2496 trigger_log_thread(struct tog_view *view, int wait)
2497 {
2498 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2499 	int errcode;
2500 
2501 	halfdelay(1); /* fast refresh while loading commits */
2502 
2503 	while (!ta->log_complete && !tog_thread_error &&
2504 	    (ta->commits_needed > 0 || ta->load_all)) {
2505 		/* Wake the log thread. */
2506 		errcode = pthread_cond_signal(&ta->need_commits);
2507 		if (errcode)
2508 			return got_error_set_errno(errcode,
2509 			    "pthread_cond_signal");
2510 
2511 		/*
2512 		 * The mutex will be released while the view loop waits
2513 		 * in wgetch(), at which time the log thread will run.
2514 		 */
2515 		if (!wait)
2516 			break;
2517 
2518 		/* Display progress update in log view. */
2519 		show_log_view(view);
2520 		update_panels();
2521 		doupdate();
2522 
2523 		/* Wait right here while next commit is being loaded. */
2524 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2525 		if (errcode)
2526 			return got_error_set_errno(errcode,
2527 			    "pthread_cond_wait");
2528 
2529 		/* Display progress update in log view. */
2530 		show_log_view(view);
2531 		update_panels();
2532 		doupdate();
2533 	}
2534 
2535 	return NULL;
2536 }
2537 
2538 static const struct got_error *
2539 request_log_commits(struct tog_view *view)
2540 {
2541 	struct tog_log_view_state	*state = &view->state.log;
2542 	const struct got_error		*err = NULL;
2543 
2544 	if (state->thread_args.log_complete)
2545 		return NULL;
2546 
2547 	state->thread_args.commits_needed += view->nscrolled;
2548 	err = trigger_log_thread(view, 1);
2549 	view->nscrolled = 0;
2550 
2551 	return err;
2552 }
2553 
2554 static const struct got_error *
2555 log_scroll_down(struct tog_view *view, int maxscroll)
2556 {
2557 	struct tog_log_view_state *s = &view->state.log;
2558 	const struct got_error *err = NULL;
2559 	struct commit_queue_entry *pentry;
2560 	int nscrolled = 0, ncommits_needed;
2561 
2562 	if (s->last_displayed_entry == NULL)
2563 		return NULL;
2564 
2565 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2566 	if (s->commits->ncommits < ncommits_needed &&
2567 	    !s->thread_args.log_complete) {
2568 		/*
2569 		 * Ask the log thread for required amount of commits.
2570 		 */
2571 		s->thread_args.commits_needed +=
2572 		    ncommits_needed - s->commits->ncommits;
2573 		err = trigger_log_thread(view, 1);
2574 		if (err)
2575 			return err;
2576 	}
2577 
2578 	do {
2579 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2580 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2581 			break;
2582 
2583 		s->last_displayed_entry = pentry ?
2584 		    pentry : s->last_displayed_entry;;
2585 
2586 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2587 		if (pentry == NULL)
2588 			break;
2589 		s->first_displayed_entry = pentry;
2590 	} while (++nscrolled < maxscroll);
2591 
2592 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2593 		view->nscrolled += nscrolled;
2594 	else
2595 		view->nscrolled = 0;
2596 
2597 	return err;
2598 }
2599 
2600 static const struct got_error *
2601 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2602     struct got_commit_object *commit, struct got_object_id *commit_id,
2603     struct tog_view *log_view, struct got_repository *repo)
2604 {
2605 	const struct got_error *err;
2606 	struct got_object_qid *parent_id;
2607 	struct tog_view *diff_view;
2608 
2609 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2610 	if (diff_view == NULL)
2611 		return got_error_from_errno("view_open");
2612 
2613 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2614 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2615 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2616 	if (err == NULL)
2617 		*new_view = diff_view;
2618 	return err;
2619 }
2620 
2621 static const struct got_error *
2622 tree_view_visit_subtree(struct tog_tree_view_state *s,
2623     struct got_tree_object *subtree)
2624 {
2625 	struct tog_parent_tree *parent;
2626 
2627 	parent = calloc(1, sizeof(*parent));
2628 	if (parent == NULL)
2629 		return got_error_from_errno("calloc");
2630 
2631 	parent->tree = s->tree;
2632 	parent->first_displayed_entry = s->first_displayed_entry;
2633 	parent->selected_entry = s->selected_entry;
2634 	parent->selected = s->selected;
2635 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2636 	s->tree = subtree;
2637 	s->selected = 0;
2638 	s->first_displayed_entry = NULL;
2639 	return NULL;
2640 }
2641 
2642 static const struct got_error *
2643 tree_view_walk_path(struct tog_tree_view_state *s,
2644     struct got_commit_object *commit, const char *path)
2645 {
2646 	const struct got_error *err = NULL;
2647 	struct got_tree_object *tree = NULL;
2648 	const char *p;
2649 	char *slash, *subpath = NULL;
2650 
2651 	/* Walk the path and open corresponding tree objects. */
2652 	p = path;
2653 	while (*p) {
2654 		struct got_tree_entry *te;
2655 		struct got_object_id *tree_id;
2656 		char *te_name;
2657 
2658 		while (p[0] == '/')
2659 			p++;
2660 
2661 		/* Ensure the correct subtree entry is selected. */
2662 		slash = strchr(p, '/');
2663 		if (slash == NULL)
2664 			te_name = strdup(p);
2665 		else
2666 			te_name = strndup(p, slash - p);
2667 		if (te_name == NULL) {
2668 			err = got_error_from_errno("strndup");
2669 			break;
2670 		}
2671 		te = got_object_tree_find_entry(s->tree, te_name);
2672 		if (te == NULL) {
2673 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2674 			free(te_name);
2675 			break;
2676 		}
2677 		free(te_name);
2678 		s->first_displayed_entry = s->selected_entry = te;
2679 
2680 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2681 			break; /* jump to this file's entry */
2682 
2683 		slash = strchr(p, '/');
2684 		if (slash)
2685 			subpath = strndup(path, slash - path);
2686 		else
2687 			subpath = strdup(path);
2688 		if (subpath == NULL) {
2689 			err = got_error_from_errno("strdup");
2690 			break;
2691 		}
2692 
2693 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2694 		    subpath);
2695 		if (err)
2696 			break;
2697 
2698 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2699 		free(tree_id);
2700 		if (err)
2701 			break;
2702 
2703 		err = tree_view_visit_subtree(s, tree);
2704 		if (err) {
2705 			got_object_tree_close(tree);
2706 			break;
2707 		}
2708 		if (slash == NULL)
2709 			break;
2710 		free(subpath);
2711 		subpath = NULL;
2712 		p = slash;
2713 	}
2714 
2715 	free(subpath);
2716 	return err;
2717 }
2718 
2719 static const struct got_error *
2720 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2721     struct commit_queue_entry *entry, const char *path,
2722     const char *head_ref_name, struct got_repository *repo)
2723 {
2724 	const struct got_error *err = NULL;
2725 	struct tog_tree_view_state *s;
2726 	struct tog_view *tree_view;
2727 
2728 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2729 	if (tree_view == NULL)
2730 		return got_error_from_errno("view_open");
2731 
2732 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2733 	if (err)
2734 		return err;
2735 	s = &tree_view->state.tree;
2736 
2737 	*new_view = tree_view;
2738 
2739 	if (got_path_is_root_dir(path))
2740 		return NULL;
2741 
2742 	return tree_view_walk_path(s, entry->commit, path);
2743 }
2744 
2745 static const struct got_error *
2746 block_signals_used_by_main_thread(void)
2747 {
2748 	sigset_t sigset;
2749 	int errcode;
2750 
2751 	if (sigemptyset(&sigset) == -1)
2752 		return got_error_from_errno("sigemptyset");
2753 
2754 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2755 	if (sigaddset(&sigset, SIGWINCH) == -1)
2756 		return got_error_from_errno("sigaddset");
2757 	if (sigaddset(&sigset, SIGCONT) == -1)
2758 		return got_error_from_errno("sigaddset");
2759 	if (sigaddset(&sigset, SIGINT) == -1)
2760 		return got_error_from_errno("sigaddset");
2761 	if (sigaddset(&sigset, SIGTERM) == -1)
2762 		return got_error_from_errno("sigaddset");
2763 
2764 	/* ncurses handles SIGTSTP */
2765 	if (sigaddset(&sigset, SIGTSTP) == -1)
2766 		return got_error_from_errno("sigaddset");
2767 
2768 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2769 	if (errcode)
2770 		return got_error_set_errno(errcode, "pthread_sigmask");
2771 
2772 	return NULL;
2773 }
2774 
2775 static void *
2776 log_thread(void *arg)
2777 {
2778 	const struct got_error *err = NULL;
2779 	int errcode = 0;
2780 	struct tog_log_thread_args *a = arg;
2781 	int done = 0;
2782 
2783 	/*
2784 	 * Sync startup with main thread such that we begin our
2785 	 * work once view_input() has released the mutex.
2786 	 */
2787 	errcode = pthread_mutex_lock(&tog_mutex);
2788 	if (errcode) {
2789 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2790 		return (void *)err;
2791 	}
2792 
2793 	err = block_signals_used_by_main_thread();
2794 	if (err) {
2795 		pthread_mutex_unlock(&tog_mutex);
2796 		goto done;
2797 	}
2798 
2799 	while (!done && !err && !tog_fatal_signal_received()) {
2800 		errcode = pthread_mutex_unlock(&tog_mutex);
2801 		if (errcode) {
2802 			err = got_error_set_errno(errcode,
2803 			    "pthread_mutex_unlock");
2804 			goto done;
2805 		}
2806 		err = queue_commits(a);
2807 		if (err) {
2808 			if (err->code != GOT_ERR_ITER_COMPLETED)
2809 				goto done;
2810 			err = NULL;
2811 			done = 1;
2812 		} else if (a->commits_needed > 0 && !a->load_all) {
2813 			if (*a->limiting) {
2814 				if (a->limit_match)
2815 					a->commits_needed--;
2816 			} else
2817 				a->commits_needed--;
2818 		}
2819 
2820 		errcode = pthread_mutex_lock(&tog_mutex);
2821 		if (errcode) {
2822 			err = got_error_set_errno(errcode,
2823 			    "pthread_mutex_lock");
2824 			goto done;
2825 		} else if (*a->quit)
2826 			done = 1;
2827 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2828 			*a->first_displayed_entry =
2829 			    TAILQ_FIRST(&a->limit_commits->head);
2830 			*a->selected_entry = *a->first_displayed_entry;
2831 		} else if (*a->first_displayed_entry == NULL) {
2832 			*a->first_displayed_entry =
2833 			    TAILQ_FIRST(&a->real_commits->head);
2834 			*a->selected_entry = *a->first_displayed_entry;
2835 		}
2836 
2837 		errcode = pthread_cond_signal(&a->commit_loaded);
2838 		if (errcode) {
2839 			err = got_error_set_errno(errcode,
2840 			    "pthread_cond_signal");
2841 			pthread_mutex_unlock(&tog_mutex);
2842 			goto done;
2843 		}
2844 
2845 		if (done)
2846 			a->commits_needed = 0;
2847 		else {
2848 			if (a->commits_needed == 0 && !a->load_all) {
2849 				errcode = pthread_cond_wait(&a->need_commits,
2850 				    &tog_mutex);
2851 				if (errcode) {
2852 					err = got_error_set_errno(errcode,
2853 					    "pthread_cond_wait");
2854 					pthread_mutex_unlock(&tog_mutex);
2855 					goto done;
2856 				}
2857 				if (*a->quit)
2858 					done = 1;
2859 			}
2860 		}
2861 	}
2862 	a->log_complete = 1;
2863 	errcode = pthread_mutex_unlock(&tog_mutex);
2864 	if (errcode)
2865 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2866 done:
2867 	if (err) {
2868 		tog_thread_error = 1;
2869 		pthread_cond_signal(&a->commit_loaded);
2870 	}
2871 	return (void *)err;
2872 }
2873 
2874 static const struct got_error *
2875 stop_log_thread(struct tog_log_view_state *s)
2876 {
2877 	const struct got_error *err = NULL, *thread_err = NULL;
2878 	int errcode;
2879 
2880 	if (s->thread) {
2881 		s->quit = 1;
2882 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2883 		if (errcode)
2884 			return got_error_set_errno(errcode,
2885 			    "pthread_cond_signal");
2886 		errcode = pthread_mutex_unlock(&tog_mutex);
2887 		if (errcode)
2888 			return got_error_set_errno(errcode,
2889 			    "pthread_mutex_unlock");
2890 		errcode = pthread_join(s->thread, (void **)&thread_err);
2891 		if (errcode)
2892 			return got_error_set_errno(errcode, "pthread_join");
2893 		errcode = pthread_mutex_lock(&tog_mutex);
2894 		if (errcode)
2895 			return got_error_set_errno(errcode,
2896 			    "pthread_mutex_lock");
2897 		s->thread = NULL;
2898 	}
2899 
2900 	if (s->thread_args.repo) {
2901 		err = got_repo_close(s->thread_args.repo);
2902 		s->thread_args.repo = NULL;
2903 	}
2904 
2905 	if (s->thread_args.pack_fds) {
2906 		const struct got_error *pack_err =
2907 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2908 		if (err == NULL)
2909 			err = pack_err;
2910 		s->thread_args.pack_fds = NULL;
2911 	}
2912 
2913 	if (s->thread_args.graph) {
2914 		got_commit_graph_close(s->thread_args.graph);
2915 		s->thread_args.graph = NULL;
2916 	}
2917 
2918 	return err ? err : thread_err;
2919 }
2920 
2921 static const struct got_error *
2922 close_log_view(struct tog_view *view)
2923 {
2924 	const struct got_error *err = NULL;
2925 	struct tog_log_view_state *s = &view->state.log;
2926 	int errcode;
2927 
2928 	err = stop_log_thread(s);
2929 
2930 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2931 	if (errcode && err == NULL)
2932 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2933 
2934 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2935 	if (errcode && err == NULL)
2936 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2937 
2938 	free_commits(&s->limit_commits);
2939 	free_commits(&s->real_commits);
2940 	free(s->in_repo_path);
2941 	s->in_repo_path = NULL;
2942 	free(s->start_id);
2943 	s->start_id = NULL;
2944 	free(s->head_ref_name);
2945 	s->head_ref_name = NULL;
2946 	return err;
2947 }
2948 
2949 /*
2950  * We use two queues to implement the limit feature: first consists of
2951  * commits matching the current limit_regex; second is the real queue
2952  * of all known commits (real_commits). When the user starts limiting,
2953  * we swap queues such that all movement and displaying functionality
2954  * works with very slight change.
2955  */
2956 static const struct got_error *
2957 limit_log_view(struct tog_view *view)
2958 {
2959 	struct tog_log_view_state *s = &view->state.log;
2960 	struct commit_queue_entry *entry;
2961 	struct tog_view	*v = view;
2962 	const struct got_error *err = NULL;
2963 	char pattern[1024];
2964 	int ret;
2965 
2966 	if (view_is_hsplit_top(view))
2967 		v = view->child;
2968 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
2969 		v = view->parent;
2970 
2971 	/* Get the pattern */
2972 	wmove(v->window, v->nlines - 1, 0);
2973 	wclrtoeol(v->window);
2974 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
2975 	nodelay(v->window, FALSE);
2976 	nocbreak();
2977 	echo();
2978 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
2979 	cbreak();
2980 	noecho();
2981 	nodelay(v->window, TRUE);
2982 	if (ret == ERR)
2983 		return NULL;
2984 
2985 	if (*pattern == '\0') {
2986 		/*
2987 		 * Safety measure for the situation where the user
2988 		 * resets limit without previously limiting anything.
2989 		 */
2990 		if (!s->limit_view)
2991 			return NULL;
2992 
2993 		/*
2994 		 * User could have pressed Ctrl+L, which refreshed the
2995 		 * commit queues, it means we can't save previously
2996 		 * (before limit took place) displayed entries,
2997 		 * because they would point to already free'ed memory,
2998 		 * so we are forced to always select first entry of
2999 		 * the queue.
3000 		 */
3001 		s->commits = &s->real_commits;
3002 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3003 		s->selected_entry = s->first_displayed_entry;
3004 		s->selected = 0;
3005 		s->limit_view = 0;
3006 
3007 		return NULL;
3008 	}
3009 
3010 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3011 		return NULL;
3012 
3013 	s->limit_view = 1;
3014 
3015 	/* Clear the screen while loading limit view */
3016 	s->first_displayed_entry = NULL;
3017 	s->last_displayed_entry = NULL;
3018 	s->selected_entry = NULL;
3019 	s->commits = &s->limit_commits;
3020 
3021 	/* Prepare limit queue for new search */
3022 	free_commits(&s->limit_commits);
3023 	s->limit_commits.ncommits = 0;
3024 
3025 	/* First process commits, which are in queue already */
3026 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3027 		int have_match = 0;
3028 
3029 		err = match_commit(&have_match, entry->id,
3030 		    entry->commit, &s->limit_regex);
3031 		if (err)
3032 			return err;
3033 
3034 		if (have_match) {
3035 			struct commit_queue_entry *matched;
3036 
3037 			matched = alloc_commit_queue_entry(entry->commit,
3038 			    entry->id);
3039 			if (matched == NULL) {
3040 				err = got_error_from_errno(
3041 				    "alloc_commit_queue_entry");
3042 				break;
3043 			}
3044 
3045 			err = got_object_commit_dup(&matched->commit,
3046 			    entry->commit);
3047 			if (err) {
3048 				free(matched);
3049 				return err;
3050 			}
3051 
3052 			matched->idx = s->limit_commits.ncommits;
3053 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3054 			    matched, entry);
3055 			s->limit_commits.ncommits++;
3056 		}
3057 	}
3058 
3059 	/* Second process all the commits, until we fill the screen */
3060 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3061 	    !s->thread_args.log_complete) {
3062 		s->thread_args.commits_needed +=
3063 		    view->nlines - s->limit_commits.ncommits - 1;
3064 		err = trigger_log_thread(view, 1);
3065 		if (err)
3066 			return err;
3067 	}
3068 
3069 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3070 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3071 	s->selected = 0;
3072 
3073 	return NULL;
3074 }
3075 
3076 static const struct got_error *
3077 search_start_log_view(struct tog_view *view)
3078 {
3079 	struct tog_log_view_state *s = &view->state.log;
3080 
3081 	s->matched_entry = NULL;
3082 	s->search_entry = NULL;
3083 	return NULL;
3084 }
3085 
3086 static const struct got_error *
3087 search_next_log_view(struct tog_view *view)
3088 {
3089 	const struct got_error *err = NULL;
3090 	struct tog_log_view_state *s = &view->state.log;
3091 	struct commit_queue_entry *entry;
3092 
3093 	/* Display progress update in log view. */
3094 	show_log_view(view);
3095 	update_panels();
3096 	doupdate();
3097 
3098 	if (s->search_entry) {
3099 		int errcode, ch;
3100 		errcode = pthread_mutex_unlock(&tog_mutex);
3101 		if (errcode)
3102 			return got_error_set_errno(errcode,
3103 			    "pthread_mutex_unlock");
3104 		ch = wgetch(view->window);
3105 		errcode = pthread_mutex_lock(&tog_mutex);
3106 		if (errcode)
3107 			return got_error_set_errno(errcode,
3108 			    "pthread_mutex_lock");
3109 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3110 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3111 			return NULL;
3112 		}
3113 		if (view->searching == TOG_SEARCH_FORWARD)
3114 			entry = TAILQ_NEXT(s->search_entry, entry);
3115 		else
3116 			entry = TAILQ_PREV(s->search_entry,
3117 			    commit_queue_head, entry);
3118 	} else if (s->matched_entry) {
3119 		int matched_idx = s->matched_entry->idx;
3120 		int selected_idx = s->selected_entry->idx;
3121 
3122 		/*
3123 		 * If the user has moved the cursor after we hit a match,
3124 		 * the position from where we should continue searching
3125 		 * might have changed.
3126 		 */
3127 		if (view->searching == TOG_SEARCH_FORWARD) {
3128 			if (matched_idx > selected_idx)
3129 				entry = TAILQ_NEXT(s->selected_entry, entry);
3130 			else
3131 				entry = TAILQ_NEXT(s->matched_entry, entry);
3132 		} else {
3133 			if (matched_idx < selected_idx)
3134 				entry = TAILQ_PREV(s->selected_entry,
3135 						commit_queue_head, entry);
3136 			else
3137 				entry = TAILQ_PREV(s->matched_entry,
3138 						commit_queue_head, entry);
3139 		}
3140 	} else {
3141 		entry = s->selected_entry;
3142 	}
3143 
3144 	while (1) {
3145 		int have_match = 0;
3146 
3147 		if (entry == NULL) {
3148 			if (s->thread_args.log_complete ||
3149 			    view->searching == TOG_SEARCH_BACKWARD) {
3150 				view->search_next_done =
3151 				    (s->matched_entry == NULL ?
3152 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3153 				s->search_entry = NULL;
3154 				return NULL;
3155 			}
3156 			/*
3157 			 * Poke the log thread for more commits and return,
3158 			 * allowing the main loop to make progress. Search
3159 			 * will resume at s->search_entry once we come back.
3160 			 */
3161 			s->thread_args.commits_needed++;
3162 			return trigger_log_thread(view, 0);
3163 		}
3164 
3165 		err = match_commit(&have_match, entry->id, entry->commit,
3166 		    &view->regex);
3167 		if (err)
3168 			break;
3169 		if (have_match) {
3170 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3171 			s->matched_entry = entry;
3172 			break;
3173 		}
3174 
3175 		s->search_entry = entry;
3176 		if (view->searching == TOG_SEARCH_FORWARD)
3177 			entry = TAILQ_NEXT(entry, entry);
3178 		else
3179 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3180 	}
3181 
3182 	if (s->matched_entry) {
3183 		int cur = s->selected_entry->idx;
3184 		while (cur < s->matched_entry->idx) {
3185 			err = input_log_view(NULL, view, KEY_DOWN);
3186 			if (err)
3187 				return err;
3188 			cur++;
3189 		}
3190 		while (cur > s->matched_entry->idx) {
3191 			err = input_log_view(NULL, view, KEY_UP);
3192 			if (err)
3193 				return err;
3194 			cur--;
3195 		}
3196 	}
3197 
3198 	s->search_entry = NULL;
3199 
3200 	return NULL;
3201 }
3202 
3203 static const struct got_error *
3204 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3205     struct got_repository *repo, const char *head_ref_name,
3206     const char *in_repo_path, int log_branches)
3207 {
3208 	const struct got_error *err = NULL;
3209 	struct tog_log_view_state *s = &view->state.log;
3210 	struct got_repository *thread_repo = NULL;
3211 	struct got_commit_graph *thread_graph = NULL;
3212 	int errcode;
3213 
3214 	if (in_repo_path != s->in_repo_path) {
3215 		free(s->in_repo_path);
3216 		s->in_repo_path = strdup(in_repo_path);
3217 		if (s->in_repo_path == NULL)
3218 			return got_error_from_errno("strdup");
3219 	}
3220 
3221 	/* The commit queue only contains commits being displayed. */
3222 	TAILQ_INIT(&s->real_commits.head);
3223 	s->real_commits.ncommits = 0;
3224 	s->commits = &s->real_commits;
3225 
3226 	TAILQ_INIT(&s->limit_commits.head);
3227 	s->limit_view = 0;
3228 	s->limit_commits.ncommits = 0;
3229 
3230 	s->repo = repo;
3231 	if (head_ref_name) {
3232 		s->head_ref_name = strdup(head_ref_name);
3233 		if (s->head_ref_name == NULL) {
3234 			err = got_error_from_errno("strdup");
3235 			goto done;
3236 		}
3237 	}
3238 	s->start_id = got_object_id_dup(start_id);
3239 	if (s->start_id == NULL) {
3240 		err = got_error_from_errno("got_object_id_dup");
3241 		goto done;
3242 	}
3243 	s->log_branches = log_branches;
3244 
3245 	STAILQ_INIT(&s->colors);
3246 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3247 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3248 		    get_color_value("TOG_COLOR_COMMIT"));
3249 		if (err)
3250 			goto done;
3251 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3252 		    get_color_value("TOG_COLOR_AUTHOR"));
3253 		if (err) {
3254 			free_colors(&s->colors);
3255 			goto done;
3256 		}
3257 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3258 		    get_color_value("TOG_COLOR_DATE"));
3259 		if (err) {
3260 			free_colors(&s->colors);
3261 			goto done;
3262 		}
3263 	}
3264 
3265 	view->show = show_log_view;
3266 	view->input = input_log_view;
3267 	view->resize = resize_log_view;
3268 	view->close = close_log_view;
3269 	view->search_start = search_start_log_view;
3270 	view->search_next = search_next_log_view;
3271 
3272 	if (s->thread_args.pack_fds == NULL) {
3273 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3274 		if (err)
3275 			goto done;
3276 	}
3277 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3278 	    s->thread_args.pack_fds);
3279 	if (err)
3280 		goto done;
3281 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3282 	    !s->log_branches);
3283 	if (err)
3284 		goto done;
3285 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3286 	    s->repo, NULL, NULL);
3287 	if (err)
3288 		goto done;
3289 
3290 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3291 	if (errcode) {
3292 		err = got_error_set_errno(errcode, "pthread_cond_init");
3293 		goto done;
3294 	}
3295 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3296 	if (errcode) {
3297 		err = got_error_set_errno(errcode, "pthread_cond_init");
3298 		goto done;
3299 	}
3300 
3301 	s->thread_args.commits_needed = view->nlines;
3302 	s->thread_args.graph = thread_graph;
3303 	s->thread_args.real_commits = &s->real_commits;
3304 	s->thread_args.limit_commits = &s->limit_commits;
3305 	s->thread_args.in_repo_path = s->in_repo_path;
3306 	s->thread_args.start_id = s->start_id;
3307 	s->thread_args.repo = thread_repo;
3308 	s->thread_args.log_complete = 0;
3309 	s->thread_args.quit = &s->quit;
3310 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3311 	s->thread_args.selected_entry = &s->selected_entry;
3312 	s->thread_args.searching = &view->searching;
3313 	s->thread_args.search_next_done = &view->search_next_done;
3314 	s->thread_args.regex = &view->regex;
3315 	s->thread_args.limiting = &s->limit_view;
3316 	s->thread_args.limit_regex = &s->limit_regex;
3317 	s->thread_args.limit_commits = &s->limit_commits;
3318 done:
3319 	if (err)
3320 		close_log_view(view);
3321 	return err;
3322 }
3323 
3324 static const struct got_error *
3325 show_log_view(struct tog_view *view)
3326 {
3327 	const struct got_error *err;
3328 	struct tog_log_view_state *s = &view->state.log;
3329 
3330 	if (s->thread == NULL) {
3331 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3332 		    &s->thread_args);
3333 		if (errcode)
3334 			return got_error_set_errno(errcode, "pthread_create");
3335 		if (s->thread_args.commits_needed > 0) {
3336 			err = trigger_log_thread(view, 1);
3337 			if (err)
3338 				return err;
3339 		}
3340 	}
3341 
3342 	return draw_commits(view);
3343 }
3344 
3345 static void
3346 log_move_cursor_up(struct tog_view *view, int page, int home)
3347 {
3348 	struct tog_log_view_state *s = &view->state.log;
3349 
3350 	if (s->first_displayed_entry == NULL)
3351 		return;
3352 	if (s->selected_entry->idx == 0)
3353 		view->count = 0;
3354 
3355 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3356 	    || home)
3357 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3358 
3359 	if (!page && !home && s->selected > 0)
3360 		--s->selected;
3361 	else
3362 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3363 
3364 	select_commit(s);
3365 	return;
3366 }
3367 
3368 static const struct got_error *
3369 log_move_cursor_down(struct tog_view *view, int page)
3370 {
3371 	struct tog_log_view_state	*s = &view->state.log;
3372 	const struct got_error		*err = NULL;
3373 	int				 eos = view->nlines - 2;
3374 
3375 	if (s->first_displayed_entry == NULL)
3376 		return NULL;
3377 
3378 	if (s->thread_args.log_complete &&
3379 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3380 		return NULL;
3381 
3382 	if (view_is_hsplit_top(view))
3383 		--eos;  /* border consumes the last line */
3384 
3385 	if (!page) {
3386 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3387 			++s->selected;
3388 		else
3389 			err = log_scroll_down(view, 1);
3390 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3391 		struct commit_queue_entry *entry;
3392 		int n;
3393 
3394 		s->selected = 0;
3395 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3396 		s->last_displayed_entry = entry;
3397 		for (n = 0; n <= eos; n++) {
3398 			if (entry == NULL)
3399 				break;
3400 			s->first_displayed_entry = entry;
3401 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3402 		}
3403 		if (n > 0)
3404 			s->selected = n - 1;
3405 	} else {
3406 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3407 		    s->thread_args.log_complete)
3408 			s->selected += MIN(page,
3409 			    s->commits->ncommits - s->selected_entry->idx - 1);
3410 		else
3411 			err = log_scroll_down(view, page);
3412 	}
3413 	if (err)
3414 		return err;
3415 
3416 	/*
3417 	 * We might necessarily overshoot in horizontal
3418 	 * splits; if so, select the last displayed commit.
3419 	 */
3420 	if (s->first_displayed_entry && s->last_displayed_entry) {
3421 		s->selected = MIN(s->selected,
3422 		    s->last_displayed_entry->idx -
3423 		    s->first_displayed_entry->idx);
3424 	}
3425 
3426 	select_commit(s);
3427 
3428 	if (s->thread_args.log_complete &&
3429 	    s->selected_entry->idx == s->commits->ncommits - 1)
3430 		view->count = 0;
3431 
3432 	return NULL;
3433 }
3434 
3435 static void
3436 view_get_split(struct tog_view *view, int *y, int *x)
3437 {
3438 	*x = 0;
3439 	*y = 0;
3440 
3441 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3442 		if (view->child && view->child->resized_y)
3443 			*y = view->child->resized_y;
3444 		else if (view->resized_y)
3445 			*y = view->resized_y;
3446 		else
3447 			*y = view_split_begin_y(view->lines);
3448 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3449 		if (view->child && view->child->resized_x)
3450 			*x = view->child->resized_x;
3451 		else if (view->resized_x)
3452 			*x = view->resized_x;
3453 		else
3454 			*x = view_split_begin_x(view->begin_x);
3455 	}
3456 }
3457 
3458 /* Split view horizontally at y and offset view->state->selected line. */
3459 static const struct got_error *
3460 view_init_hsplit(struct tog_view *view, int y)
3461 {
3462 	const struct got_error *err = NULL;
3463 
3464 	view->nlines = y;
3465 	view->ncols = COLS;
3466 	err = view_resize(view);
3467 	if (err)
3468 		return err;
3469 
3470 	err = offset_selection_down(view);
3471 
3472 	return err;
3473 }
3474 
3475 static const struct got_error *
3476 log_goto_line(struct tog_view *view, int nlines)
3477 {
3478 	const struct got_error		*err = NULL;
3479 	struct tog_log_view_state	*s = &view->state.log;
3480 	int				 g, idx = s->selected_entry->idx;
3481 
3482 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3483 		return NULL;
3484 
3485 	g = view->gline;
3486 	view->gline = 0;
3487 
3488 	if (g >= s->first_displayed_entry->idx + 1 &&
3489 	    g <= s->last_displayed_entry->idx + 1 &&
3490 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3491 		s->selected = g - s->first_displayed_entry->idx - 1;
3492 		select_commit(s);
3493 		return NULL;
3494 	}
3495 
3496 	if (idx + 1 < g) {
3497 		err = log_move_cursor_down(view, g - idx - 1);
3498 		if (!err && g > s->selected_entry->idx + 1)
3499 			err = log_move_cursor_down(view,
3500 			    g - s->first_displayed_entry->idx - 1);
3501 		if (err)
3502 			return err;
3503 	} else if (idx + 1 > g)
3504 		log_move_cursor_up(view, idx - g + 1, 0);
3505 
3506 	if (g < nlines && s->first_displayed_entry->idx == 0)
3507 		s->selected = g - 1;
3508 
3509 	select_commit(s);
3510 	return NULL;
3511 
3512 }
3513 
3514 static const struct got_error *
3515 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3516 {
3517 	const struct got_error *err = NULL;
3518 	struct tog_log_view_state *s = &view->state.log;
3519 	int eos, nscroll;
3520 
3521 	if (s->thread_args.load_all) {
3522 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3523 			s->thread_args.load_all = 0;
3524 		else if (s->thread_args.log_complete) {
3525 			err = log_move_cursor_down(view, s->commits->ncommits);
3526 			s->thread_args.load_all = 0;
3527 		}
3528 		if (err)
3529 			return err;
3530 	}
3531 
3532 	eos = nscroll = view->nlines - 1;
3533 	if (view_is_hsplit_top(view))
3534 		--eos;  /* border */
3535 
3536 	if (view->gline)
3537 		return log_goto_line(view, eos);
3538 
3539 	switch (ch) {
3540 	case '&':
3541 		err = limit_log_view(view);
3542 		break;
3543 	case 'q':
3544 		s->quit = 1;
3545 		break;
3546 	case '0':
3547 		view->x = 0;
3548 		break;
3549 	case '$':
3550 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3551 		view->count = 0;
3552 		break;
3553 	case KEY_RIGHT:
3554 	case 'l':
3555 		if (view->x + view->ncols / 2 < view->maxx)
3556 			view->x += 2;  /* move two columns right */
3557 		else
3558 			view->count = 0;
3559 		break;
3560 	case KEY_LEFT:
3561 	case 'h':
3562 		view->x -= MIN(view->x, 2);  /* move two columns back */
3563 		if (view->x <= 0)
3564 			view->count = 0;
3565 		break;
3566 	case 'k':
3567 	case KEY_UP:
3568 	case '<':
3569 	case ',':
3570 	case CTRL('p'):
3571 		log_move_cursor_up(view, 0, 0);
3572 		break;
3573 	case 'g':
3574 	case KEY_HOME:
3575 		log_move_cursor_up(view, 0, 1);
3576 		view->count = 0;
3577 		break;
3578 	case CTRL('u'):
3579 	case 'u':
3580 		nscroll /= 2;
3581 		/* FALL THROUGH */
3582 	case KEY_PPAGE:
3583 	case CTRL('b'):
3584 	case 'b':
3585 		log_move_cursor_up(view, nscroll, 0);
3586 		break;
3587 	case 'j':
3588 	case KEY_DOWN:
3589 	case '>':
3590 	case '.':
3591 	case CTRL('n'):
3592 		err = log_move_cursor_down(view, 0);
3593 		break;
3594 	case '@':
3595 		s->use_committer = !s->use_committer;
3596 		break;
3597 	case 'G':
3598 	case KEY_END: {
3599 		/* We don't know yet how many commits, so we're forced to
3600 		 * traverse them all. */
3601 		view->count = 0;
3602 		s->thread_args.load_all = 1;
3603 		if (!s->thread_args.log_complete)
3604 			return trigger_log_thread(view, 0);
3605 		err = log_move_cursor_down(view, s->commits->ncommits);
3606 		s->thread_args.load_all = 0;
3607 		break;
3608 	}
3609 	case CTRL('d'):
3610 	case 'd':
3611 		nscroll /= 2;
3612 		/* FALL THROUGH */
3613 	case KEY_NPAGE:
3614 	case CTRL('f'):
3615 	case 'f':
3616 	case ' ':
3617 		err = log_move_cursor_down(view, nscroll);
3618 		break;
3619 	case KEY_RESIZE:
3620 		if (s->selected > view->nlines - 2)
3621 			s->selected = view->nlines - 2;
3622 		if (s->selected > s->commits->ncommits - 1)
3623 			s->selected = s->commits->ncommits - 1;
3624 		select_commit(s);
3625 		if (s->commits->ncommits < view->nlines - 1 &&
3626 		    !s->thread_args.log_complete) {
3627 			s->thread_args.commits_needed += (view->nlines - 1) -
3628 			    s->commits->ncommits;
3629 			err = trigger_log_thread(view, 1);
3630 		}
3631 		break;
3632 	case KEY_ENTER:
3633 	case '\r':
3634 		view->count = 0;
3635 		if (s->selected_entry == NULL)
3636 			break;
3637 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3638 		break;
3639 	case 'T':
3640 		view->count = 0;
3641 		if (s->selected_entry == NULL)
3642 			break;
3643 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3644 		break;
3645 	case KEY_BACKSPACE:
3646 	case CTRL('l'):
3647 	case 'B':
3648 		view->count = 0;
3649 		if (ch == KEY_BACKSPACE &&
3650 		    got_path_is_root_dir(s->in_repo_path))
3651 			break;
3652 		err = stop_log_thread(s);
3653 		if (err)
3654 			return err;
3655 		if (ch == KEY_BACKSPACE) {
3656 			char *parent_path;
3657 			err = got_path_dirname(&parent_path, s->in_repo_path);
3658 			if (err)
3659 				return err;
3660 			free(s->in_repo_path);
3661 			s->in_repo_path = parent_path;
3662 			s->thread_args.in_repo_path = s->in_repo_path;
3663 		} else if (ch == CTRL('l')) {
3664 			struct got_object_id *start_id;
3665 			err = got_repo_match_object_id(&start_id, NULL,
3666 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3667 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3668 			if (err)
3669 				return err;
3670 			free(s->start_id);
3671 			s->start_id = start_id;
3672 			s->thread_args.start_id = s->start_id;
3673 		} else /* 'B' */
3674 			s->log_branches = !s->log_branches;
3675 
3676 		if (s->thread_args.pack_fds == NULL) {
3677 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3678 			if (err)
3679 				return err;
3680 		}
3681 		err = got_repo_open(&s->thread_args.repo,
3682 		    got_repo_get_path(s->repo), NULL,
3683 		    s->thread_args.pack_fds);
3684 		if (err)
3685 			return err;
3686 		tog_free_refs();
3687 		err = tog_load_refs(s->repo, 0);
3688 		if (err)
3689 			return err;
3690 		err = got_commit_graph_open(&s->thread_args.graph,
3691 		    s->in_repo_path, !s->log_branches);
3692 		if (err)
3693 			return err;
3694 		err = got_commit_graph_iter_start(s->thread_args.graph,
3695 		    s->start_id, s->repo, NULL, NULL);
3696 		if (err)
3697 			return err;
3698 		free_commits(&s->real_commits);
3699 		free_commits(&s->limit_commits);
3700 		s->first_displayed_entry = NULL;
3701 		s->last_displayed_entry = NULL;
3702 		s->selected_entry = NULL;
3703 		s->selected = 0;
3704 		s->thread_args.log_complete = 0;
3705 		s->quit = 0;
3706 		s->thread_args.commits_needed = view->lines;
3707 		s->matched_entry = NULL;
3708 		s->search_entry = NULL;
3709 		view->offset = 0;
3710 		break;
3711 	case 'R':
3712 		view->count = 0;
3713 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3714 		break;
3715 	default:
3716 		view->count = 0;
3717 		break;
3718 	}
3719 
3720 	return err;
3721 }
3722 
3723 static const struct got_error *
3724 apply_unveil(const char *repo_path, const char *worktree_path)
3725 {
3726 	const struct got_error *error;
3727 
3728 #ifdef PROFILE
3729 	if (unveil("gmon.out", "rwc") != 0)
3730 		return got_error_from_errno2("unveil", "gmon.out");
3731 #endif
3732 	if (repo_path && unveil(repo_path, "r") != 0)
3733 		return got_error_from_errno2("unveil", repo_path);
3734 
3735 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3736 		return got_error_from_errno2("unveil", worktree_path);
3737 
3738 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3739 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3740 
3741 	error = got_privsep_unveil_exec_helpers();
3742 	if (error != NULL)
3743 		return error;
3744 
3745 	if (unveil(NULL, NULL) != 0)
3746 		return got_error_from_errno("unveil");
3747 
3748 	return NULL;
3749 }
3750 
3751 static void
3752 init_curses(void)
3753 {
3754 	/*
3755 	 * Override default signal handlers before starting ncurses.
3756 	 * This should prevent ncurses from installing its own
3757 	 * broken cleanup() signal handler.
3758 	 */
3759 	signal(SIGWINCH, tog_sigwinch);
3760 	signal(SIGPIPE, tog_sigpipe);
3761 	signal(SIGCONT, tog_sigcont);
3762 	signal(SIGINT, tog_sigint);
3763 	signal(SIGTERM, tog_sigterm);
3764 
3765 	initscr();
3766 	cbreak();
3767 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3768 	noecho();
3769 	nonl();
3770 	intrflush(stdscr, FALSE);
3771 	keypad(stdscr, TRUE);
3772 	curs_set(0);
3773 	if (getenv("TOG_COLORS") != NULL) {
3774 		start_color();
3775 		use_default_colors();
3776 	}
3777 }
3778 
3779 static const struct got_error *
3780 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3781     struct got_repository *repo, struct got_worktree *worktree)
3782 {
3783 	const struct got_error *err = NULL;
3784 
3785 	if (argc == 0) {
3786 		*in_repo_path = strdup("/");
3787 		if (*in_repo_path == NULL)
3788 			return got_error_from_errno("strdup");
3789 		return NULL;
3790 	}
3791 
3792 	if (worktree) {
3793 		const char *prefix = got_worktree_get_path_prefix(worktree);
3794 		char *p;
3795 
3796 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3797 		if (err)
3798 			return err;
3799 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3800 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3801 		    p) == -1) {
3802 			err = got_error_from_errno("asprintf");
3803 			*in_repo_path = NULL;
3804 		}
3805 		free(p);
3806 	} else
3807 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3808 
3809 	return err;
3810 }
3811 
3812 static const struct got_error *
3813 cmd_log(int argc, char *argv[])
3814 {
3815 	const struct got_error *error;
3816 	struct got_repository *repo = NULL;
3817 	struct got_worktree *worktree = NULL;
3818 	struct got_object_id *start_id = NULL;
3819 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3820 	char *start_commit = NULL, *label = NULL;
3821 	struct got_reference *ref = NULL;
3822 	const char *head_ref_name = NULL;
3823 	int ch, log_branches = 0;
3824 	struct tog_view *view;
3825 	int *pack_fds = NULL;
3826 
3827 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3828 		switch (ch) {
3829 		case 'b':
3830 			log_branches = 1;
3831 			break;
3832 		case 'c':
3833 			start_commit = optarg;
3834 			break;
3835 		case 'r':
3836 			repo_path = realpath(optarg, NULL);
3837 			if (repo_path == NULL)
3838 				return got_error_from_errno2("realpath",
3839 				    optarg);
3840 			break;
3841 		default:
3842 			usage_log();
3843 			/* NOTREACHED */
3844 		}
3845 	}
3846 
3847 	argc -= optind;
3848 	argv += optind;
3849 
3850 	if (argc > 1)
3851 		usage_log();
3852 
3853 	error = got_repo_pack_fds_open(&pack_fds);
3854 	if (error != NULL)
3855 		goto done;
3856 
3857 	if (repo_path == NULL) {
3858 		cwd = getcwd(NULL, 0);
3859 		if (cwd == NULL)
3860 			return got_error_from_errno("getcwd");
3861 		error = got_worktree_open(&worktree, cwd);
3862 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3863 			goto done;
3864 		if (worktree)
3865 			repo_path =
3866 			    strdup(got_worktree_get_repo_path(worktree));
3867 		else
3868 			repo_path = strdup(cwd);
3869 		if (repo_path == NULL) {
3870 			error = got_error_from_errno("strdup");
3871 			goto done;
3872 		}
3873 	}
3874 
3875 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3876 	if (error != NULL)
3877 		goto done;
3878 
3879 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3880 	    repo, worktree);
3881 	if (error)
3882 		goto done;
3883 
3884 	init_curses();
3885 
3886 	error = apply_unveil(got_repo_get_path(repo),
3887 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3888 	if (error)
3889 		goto done;
3890 
3891 	/* already loaded by tog_log_with_path()? */
3892 	if (TAILQ_EMPTY(&tog_refs)) {
3893 		error = tog_load_refs(repo, 0);
3894 		if (error)
3895 			goto done;
3896 	}
3897 
3898 	if (start_commit == NULL) {
3899 		error = got_repo_match_object_id(&start_id, &label,
3900 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3901 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3902 		if (error)
3903 			goto done;
3904 		head_ref_name = label;
3905 	} else {
3906 		error = got_ref_open(&ref, repo, start_commit, 0);
3907 		if (error == NULL)
3908 			head_ref_name = got_ref_get_name(ref);
3909 		else if (error->code != GOT_ERR_NOT_REF)
3910 			goto done;
3911 		error = got_repo_match_object_id(&start_id, NULL,
3912 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3913 		if (error)
3914 			goto done;
3915 	}
3916 
3917 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3918 	if (view == NULL) {
3919 		error = got_error_from_errno("view_open");
3920 		goto done;
3921 	}
3922 	error = open_log_view(view, start_id, repo, head_ref_name,
3923 	    in_repo_path, log_branches);
3924 	if (error)
3925 		goto done;
3926 	if (worktree) {
3927 		/* Release work tree lock. */
3928 		got_worktree_close(worktree);
3929 		worktree = NULL;
3930 	}
3931 	error = view_loop(view);
3932 done:
3933 	free(in_repo_path);
3934 	free(repo_path);
3935 	free(cwd);
3936 	free(start_id);
3937 	free(label);
3938 	if (ref)
3939 		got_ref_close(ref);
3940 	if (repo) {
3941 		const struct got_error *close_err = got_repo_close(repo);
3942 		if (error == NULL)
3943 			error = close_err;
3944 	}
3945 	if (worktree)
3946 		got_worktree_close(worktree);
3947 	if (pack_fds) {
3948 		const struct got_error *pack_err =
3949 		    got_repo_pack_fds_close(pack_fds);
3950 		if (error == NULL)
3951 			error = pack_err;
3952 	}
3953 	tog_free_refs();
3954 	return error;
3955 }
3956 
3957 __dead static void
3958 usage_diff(void)
3959 {
3960 	endwin();
3961 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3962 	    "object1 object2\n", getprogname());
3963 	exit(1);
3964 }
3965 
3966 static int
3967 match_line(const char *line, regex_t *regex, size_t nmatch,
3968     regmatch_t *regmatch)
3969 {
3970 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3971 }
3972 
3973 static struct tog_color *
3974 match_color(struct tog_colors *colors, const char *line)
3975 {
3976 	struct tog_color *tc = NULL;
3977 
3978 	STAILQ_FOREACH(tc, colors, entry) {
3979 		if (match_line(line, &tc->regex, 0, NULL))
3980 			return tc;
3981 	}
3982 
3983 	return NULL;
3984 }
3985 
3986 static const struct got_error *
3987 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3988     WINDOW *window, int skipcol, regmatch_t *regmatch)
3989 {
3990 	const struct got_error *err = NULL;
3991 	char *exstr = NULL;
3992 	wchar_t *wline = NULL;
3993 	int rme, rms, n, width, scrollx;
3994 	int width0 = 0, width1 = 0, width2 = 0;
3995 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3996 
3997 	*wtotal = 0;
3998 
3999 	rms = regmatch->rm_so;
4000 	rme = regmatch->rm_eo;
4001 
4002 	err = expand_tab(&exstr, line);
4003 	if (err)
4004 		return err;
4005 
4006 	/* Split the line into 3 segments, according to match offsets. */
4007 	seg0 = strndup(exstr, rms);
4008 	if (seg0 == NULL) {
4009 		err = got_error_from_errno("strndup");
4010 		goto done;
4011 	}
4012 	seg1 = strndup(exstr + rms, rme - rms);
4013 	if (seg1 == NULL) {
4014 		err = got_error_from_errno("strndup");
4015 		goto done;
4016 	}
4017 	seg2 = strdup(exstr + rme);
4018 	if (seg2 == NULL) {
4019 		err = got_error_from_errno("strndup");
4020 		goto done;
4021 	}
4022 
4023 	/* draw up to matched token if we haven't scrolled past it */
4024 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4025 	    col_tab_align, 1);
4026 	if (err)
4027 		goto done;
4028 	n = MAX(width0 - skipcol, 0);
4029 	if (n) {
4030 		free(wline);
4031 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4032 		    wlimit, col_tab_align, 1);
4033 		if (err)
4034 			goto done;
4035 		waddwstr(window, &wline[scrollx]);
4036 		wlimit -= width;
4037 		*wtotal += width;
4038 	}
4039 
4040 	if (wlimit > 0) {
4041 		int i = 0, w = 0;
4042 		size_t wlen;
4043 
4044 		free(wline);
4045 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4046 		    col_tab_align, 1);
4047 		if (err)
4048 			goto done;
4049 		wlen = wcslen(wline);
4050 		while (i < wlen) {
4051 			width = wcwidth(wline[i]);
4052 			if (width == -1) {
4053 				/* should not happen, tabs are expanded */
4054 				err = got_error(GOT_ERR_RANGE);
4055 				goto done;
4056 			}
4057 			if (width0 + w + width > skipcol)
4058 				break;
4059 			w += width;
4060 			i++;
4061 		}
4062 		/* draw (visible part of) matched token (if scrolled into it) */
4063 		if (width1 - w > 0) {
4064 			wattron(window, A_STANDOUT);
4065 			waddwstr(window, &wline[i]);
4066 			wattroff(window, A_STANDOUT);
4067 			wlimit -= (width1 - w);
4068 			*wtotal += (width1 - w);
4069 		}
4070 	}
4071 
4072 	if (wlimit > 0) {  /* draw rest of line */
4073 		free(wline);
4074 		if (skipcol > width0 + width1) {
4075 			err = format_line(&wline, &width2, &scrollx, seg2,
4076 			    skipcol - (width0 + width1), wlimit,
4077 			    col_tab_align, 1);
4078 			if (err)
4079 				goto done;
4080 			waddwstr(window, &wline[scrollx]);
4081 		} else {
4082 			err = format_line(&wline, &width2, NULL, seg2, 0,
4083 			    wlimit, col_tab_align, 1);
4084 			if (err)
4085 				goto done;
4086 			waddwstr(window, wline);
4087 		}
4088 		*wtotal += width2;
4089 	}
4090 done:
4091 	free(wline);
4092 	free(exstr);
4093 	free(seg0);
4094 	free(seg1);
4095 	free(seg2);
4096 	return err;
4097 }
4098 
4099 static int
4100 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4101 {
4102 	FILE	*f = NULL;
4103 	int	*eof, *first, *selected;
4104 
4105 	if (view->type == TOG_VIEW_DIFF) {
4106 		struct tog_diff_view_state *s = &view->state.diff;
4107 
4108 		first = &s->first_displayed_line;
4109 		selected = first;
4110 		eof = &s->eof;
4111 		f = s->f;
4112 	} else if (view->type == TOG_VIEW_BLAME) {
4113 		struct tog_blame_view_state *s = &view->state.blame;
4114 
4115 		first = &s->first_displayed_line;
4116 		selected = &s->selected_line;
4117 		eof = &s->eof;
4118 		f = s->blame.f;
4119 	} else
4120 		return 0;
4121 
4122 	/* Center gline in the middle of the page like vi(1). */
4123 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4124 		return 0;
4125 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4126 		rewind(f);
4127 		*eof = 0;
4128 		*first = 1;
4129 		*lineno = 0;
4130 		*nprinted = 0;
4131 		return 0;
4132 	}
4133 
4134 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4135 		view->gline : (view->nlines - 3) / 2 + 1;
4136 	view->gline = 0;
4137 
4138 	return 1;
4139 }
4140 
4141 static const struct got_error *
4142 draw_file(struct tog_view *view, const char *header)
4143 {
4144 	struct tog_diff_view_state *s = &view->state.diff;
4145 	regmatch_t *regmatch = &view->regmatch;
4146 	const struct got_error *err;
4147 	int nprinted = 0;
4148 	char *line;
4149 	size_t linesize = 0;
4150 	ssize_t linelen;
4151 	wchar_t *wline;
4152 	int width;
4153 	int max_lines = view->nlines;
4154 	int nlines = s->nlines;
4155 	off_t line_offset;
4156 
4157 	s->lineno = s->first_displayed_line - 1;
4158 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4159 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4160 		return got_error_from_errno("fseek");
4161 
4162 	werase(view->window);
4163 
4164 	if (view->gline > s->nlines - 1)
4165 		view->gline = s->nlines - 1;
4166 
4167 	if (header) {
4168 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4169 		    1 : view->gline - (view->nlines - 3) / 2 :
4170 		    s->lineno + s->selected_line;
4171 
4172 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4173 			return got_error_from_errno("asprintf");
4174 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4175 		    0, 0);
4176 		free(line);
4177 		if (err)
4178 			return err;
4179 
4180 		if (view_needs_focus_indication(view))
4181 			wstandout(view->window);
4182 		waddwstr(view->window, wline);
4183 		free(wline);
4184 		wline = NULL;
4185 		while (width++ < view->ncols)
4186 			waddch(view->window, ' ');
4187 		if (view_needs_focus_indication(view))
4188 			wstandend(view->window);
4189 
4190 		if (max_lines <= 1)
4191 			return NULL;
4192 		max_lines--;
4193 	}
4194 
4195 	s->eof = 0;
4196 	view->maxx = 0;
4197 	line = NULL;
4198 	while (max_lines > 0 && nprinted < max_lines) {
4199 		enum got_diff_line_type linetype;
4200 		attr_t attr = 0;
4201 
4202 		linelen = getline(&line, &linesize, s->f);
4203 		if (linelen == -1) {
4204 			if (feof(s->f)) {
4205 				s->eof = 1;
4206 				break;
4207 			}
4208 			free(line);
4209 			return got_ferror(s->f, GOT_ERR_IO);
4210 		}
4211 
4212 		if (++s->lineno < s->first_displayed_line)
4213 			continue;
4214 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4215 			continue;
4216 		if (s->lineno == view->hiline)
4217 			attr = A_STANDOUT;
4218 
4219 		/* Set view->maxx based on full line length. */
4220 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4221 		    view->x ? 1 : 0);
4222 		if (err) {
4223 			free(line);
4224 			return err;
4225 		}
4226 		view->maxx = MAX(view->maxx, width);
4227 		free(wline);
4228 		wline = NULL;
4229 
4230 		linetype = s->lines[s->lineno].type;
4231 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4232 		    linetype < GOT_DIFF_LINE_CONTEXT)
4233 			attr |= COLOR_PAIR(linetype);
4234 		if (attr)
4235 			wattron(view->window, attr);
4236 		if (s->first_displayed_line + nprinted == s->matched_line &&
4237 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4238 			err = add_matched_line(&width, line, view->ncols, 0,
4239 			    view->window, view->x, regmatch);
4240 			if (err) {
4241 				free(line);
4242 				return err;
4243 			}
4244 		} else {
4245 			int skip;
4246 			err = format_line(&wline, &width, &skip, line,
4247 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4248 			if (err) {
4249 				free(line);
4250 				return err;
4251 			}
4252 			waddwstr(view->window, &wline[skip]);
4253 			free(wline);
4254 			wline = NULL;
4255 		}
4256 		if (s->lineno == view->hiline) {
4257 			/* highlight full gline length */
4258 			while (width++ < view->ncols)
4259 				waddch(view->window, ' ');
4260 		} else {
4261 			if (width <= view->ncols - 1)
4262 				waddch(view->window, '\n');
4263 		}
4264 		if (attr)
4265 			wattroff(view->window, attr);
4266 		if (++nprinted == 1)
4267 			s->first_displayed_line = s->lineno;
4268 	}
4269 	free(line);
4270 	if (nprinted >= 1)
4271 		s->last_displayed_line = s->first_displayed_line +
4272 		    (nprinted - 1);
4273 	else
4274 		s->last_displayed_line = s->first_displayed_line;
4275 
4276 	view_border(view);
4277 
4278 	if (s->eof) {
4279 		while (nprinted < view->nlines) {
4280 			waddch(view->window, '\n');
4281 			nprinted++;
4282 		}
4283 
4284 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4285 		    view->ncols, 0, 0);
4286 		if (err) {
4287 			return err;
4288 		}
4289 
4290 		wstandout(view->window);
4291 		waddwstr(view->window, wline);
4292 		free(wline);
4293 		wline = NULL;
4294 		wstandend(view->window);
4295 	}
4296 
4297 	return NULL;
4298 }
4299 
4300 static char *
4301 get_datestr(time_t *time, char *datebuf)
4302 {
4303 	struct tm mytm, *tm;
4304 	char *p, *s;
4305 
4306 	tm = gmtime_r(time, &mytm);
4307 	if (tm == NULL)
4308 		return NULL;
4309 	s = asctime_r(tm, datebuf);
4310 	if (s == NULL)
4311 		return NULL;
4312 	p = strchr(s, '\n');
4313 	if (p)
4314 		*p = '\0';
4315 	return s;
4316 }
4317 
4318 static const struct got_error *
4319 get_changed_paths(struct got_pathlist_head *paths,
4320     struct got_commit_object *commit, struct got_repository *repo)
4321 {
4322 	const struct got_error *err = NULL;
4323 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4324 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4325 	struct got_object_qid *qid;
4326 
4327 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4328 	if (qid != NULL) {
4329 		struct got_commit_object *pcommit;
4330 		err = got_object_open_as_commit(&pcommit, repo,
4331 		    &qid->id);
4332 		if (err)
4333 			return err;
4334 
4335 		tree_id1 = got_object_id_dup(
4336 		    got_object_commit_get_tree_id(pcommit));
4337 		if (tree_id1 == NULL) {
4338 			got_object_commit_close(pcommit);
4339 			return got_error_from_errno("got_object_id_dup");
4340 		}
4341 		got_object_commit_close(pcommit);
4342 
4343 	}
4344 
4345 	if (tree_id1) {
4346 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4347 		if (err)
4348 			goto done;
4349 	}
4350 
4351 	tree_id2 = got_object_commit_get_tree_id(commit);
4352 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4353 	if (err)
4354 		goto done;
4355 
4356 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4357 	    got_diff_tree_collect_changed_paths, paths, 0);
4358 done:
4359 	if (tree1)
4360 		got_object_tree_close(tree1);
4361 	if (tree2)
4362 		got_object_tree_close(tree2);
4363 	free(tree_id1);
4364 	return err;
4365 }
4366 
4367 static const struct got_error *
4368 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4369     off_t off, uint8_t type)
4370 {
4371 	struct got_diff_line *p;
4372 
4373 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4374 	if (p == NULL)
4375 		return got_error_from_errno("reallocarray");
4376 	*lines = p;
4377 	(*lines)[*nlines].offset = off;
4378 	(*lines)[*nlines].type = type;
4379 	(*nlines)++;
4380 
4381 	return NULL;
4382 }
4383 
4384 static const struct got_error *
4385 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4386     struct got_object_id *commit_id, struct got_reflist_head *refs,
4387     struct got_repository *repo, FILE *outfile)
4388 {
4389 	const struct got_error *err = NULL;
4390 	char datebuf[26], *datestr;
4391 	struct got_commit_object *commit;
4392 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4393 	time_t committer_time;
4394 	const char *author, *committer;
4395 	char *refs_str = NULL;
4396 	struct got_pathlist_head changed_paths;
4397 	struct got_pathlist_entry *pe;
4398 	off_t outoff = 0;
4399 	int n;
4400 
4401 	TAILQ_INIT(&changed_paths);
4402 
4403 	if (refs) {
4404 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4405 		if (err)
4406 			return err;
4407 	}
4408 
4409 	err = got_object_open_as_commit(&commit, repo, commit_id);
4410 	if (err)
4411 		return err;
4412 
4413 	err = got_object_id_str(&id_str, commit_id);
4414 	if (err) {
4415 		err = got_error_from_errno("got_object_id_str");
4416 		goto done;
4417 	}
4418 
4419 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4420 	if (err)
4421 		goto done;
4422 
4423 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4424 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4425 	if (n < 0) {
4426 		err = got_error_from_errno("fprintf");
4427 		goto done;
4428 	}
4429 	outoff += n;
4430 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4431 	if (err)
4432 		goto done;
4433 
4434 	n = fprintf(outfile, "from: %s\n",
4435 	    got_object_commit_get_author(commit));
4436 	if (n < 0) {
4437 		err = got_error_from_errno("fprintf");
4438 		goto done;
4439 	}
4440 	outoff += n;
4441 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4442 	if (err)
4443 		goto done;
4444 
4445 	committer_time = got_object_commit_get_committer_time(commit);
4446 	datestr = get_datestr(&committer_time, datebuf);
4447 	if (datestr) {
4448 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4449 		if (n < 0) {
4450 			err = got_error_from_errno("fprintf");
4451 			goto done;
4452 		}
4453 		outoff += n;
4454 		err = add_line_metadata(lines, nlines, outoff,
4455 		    GOT_DIFF_LINE_DATE);
4456 		if (err)
4457 			goto done;
4458 	}
4459 	author = got_object_commit_get_author(commit);
4460 	committer = got_object_commit_get_committer(commit);
4461 	if (strcmp(author, committer) != 0) {
4462 		n = fprintf(outfile, "via: %s\n", committer);
4463 		if (n < 0) {
4464 			err = got_error_from_errno("fprintf");
4465 			goto done;
4466 		}
4467 		outoff += n;
4468 		err = add_line_metadata(lines, nlines, outoff,
4469 		    GOT_DIFF_LINE_AUTHOR);
4470 		if (err)
4471 			goto done;
4472 	}
4473 	if (got_object_commit_get_nparents(commit) > 1) {
4474 		const struct got_object_id_queue *parent_ids;
4475 		struct got_object_qid *qid;
4476 		int pn = 1;
4477 		parent_ids = got_object_commit_get_parent_ids(commit);
4478 		STAILQ_FOREACH(qid, parent_ids, entry) {
4479 			err = got_object_id_str(&id_str, &qid->id);
4480 			if (err)
4481 				goto done;
4482 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4483 			if (n < 0) {
4484 				err = got_error_from_errno("fprintf");
4485 				goto done;
4486 			}
4487 			outoff += n;
4488 			err = add_line_metadata(lines, nlines, outoff,
4489 			    GOT_DIFF_LINE_META);
4490 			if (err)
4491 				goto done;
4492 			free(id_str);
4493 			id_str = NULL;
4494 		}
4495 	}
4496 
4497 	err = got_object_commit_get_logmsg(&logmsg, commit);
4498 	if (err)
4499 		goto done;
4500 	s = logmsg;
4501 	while ((line = strsep(&s, "\n")) != NULL) {
4502 		n = fprintf(outfile, "%s\n", line);
4503 		if (n < 0) {
4504 			err = got_error_from_errno("fprintf");
4505 			goto done;
4506 		}
4507 		outoff += n;
4508 		err = add_line_metadata(lines, nlines, outoff,
4509 		    GOT_DIFF_LINE_LOGMSG);
4510 		if (err)
4511 			goto done;
4512 	}
4513 
4514 	err = get_changed_paths(&changed_paths, commit, repo);
4515 	if (err)
4516 		goto done;
4517 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4518 		struct got_diff_changed_path *cp = pe->data;
4519 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4520 		if (n < 0) {
4521 			err = got_error_from_errno("fprintf");
4522 			goto done;
4523 		}
4524 		outoff += n;
4525 		err = add_line_metadata(lines, nlines, outoff,
4526 		    GOT_DIFF_LINE_CHANGES);
4527 		if (err)
4528 			goto done;
4529 		free((char *)pe->path);
4530 		free(pe->data);
4531 	}
4532 
4533 	fputc('\n', outfile);
4534 	outoff++;
4535 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4536 done:
4537 	got_pathlist_free(&changed_paths);
4538 	free(id_str);
4539 	free(logmsg);
4540 	free(refs_str);
4541 	got_object_commit_close(commit);
4542 	if (err) {
4543 		free(*lines);
4544 		*lines = NULL;
4545 		*nlines = 0;
4546 	}
4547 	return err;
4548 }
4549 
4550 static const struct got_error *
4551 create_diff(struct tog_diff_view_state *s)
4552 {
4553 	const struct got_error *err = NULL;
4554 	FILE *f = NULL;
4555 	int obj_type;
4556 
4557 	free(s->lines);
4558 	s->lines = malloc(sizeof(*s->lines));
4559 	if (s->lines == NULL)
4560 		return got_error_from_errno("malloc");
4561 	s->nlines = 0;
4562 
4563 	f = got_opentemp();
4564 	if (f == NULL) {
4565 		err = got_error_from_errno("got_opentemp");
4566 		goto done;
4567 	}
4568 	if (s->f && fclose(s->f) == EOF) {
4569 		err = got_error_from_errno("fclose");
4570 		goto done;
4571 	}
4572 	s->f = f;
4573 
4574 	if (s->id1)
4575 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4576 	else
4577 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4578 	if (err)
4579 		goto done;
4580 
4581 	switch (obj_type) {
4582 	case GOT_OBJ_TYPE_BLOB:
4583 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4584 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4585 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4586 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4587 		break;
4588 	case GOT_OBJ_TYPE_TREE:
4589 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4590 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4591 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4592 		    s->force_text_diff, s->repo, s->f);
4593 		break;
4594 	case GOT_OBJ_TYPE_COMMIT: {
4595 		const struct got_object_id_queue *parent_ids;
4596 		struct got_object_qid *pid;
4597 		struct got_commit_object *commit2;
4598 		struct got_reflist_head *refs;
4599 
4600 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4601 		if (err)
4602 			goto done;
4603 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4604 		/* Show commit info if we're diffing to a parent/root commit. */
4605 		if (s->id1 == NULL) {
4606 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4607 			    refs, s->repo, s->f);
4608 			if (err)
4609 				goto done;
4610 		} else {
4611 			parent_ids = got_object_commit_get_parent_ids(commit2);
4612 			STAILQ_FOREACH(pid, parent_ids, entry) {
4613 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4614 					err = write_commit_info(&s->lines,
4615 					    &s->nlines, s->id2, refs, s->repo,
4616 					    s->f);
4617 					if (err)
4618 						goto done;
4619 					break;
4620 				}
4621 			}
4622 		}
4623 		got_object_commit_close(commit2);
4624 
4625 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4626 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4627 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4628 		    s->force_text_diff, s->repo, s->f);
4629 		break;
4630 	}
4631 	default:
4632 		err = got_error(GOT_ERR_OBJ_TYPE);
4633 		break;
4634 	}
4635 done:
4636 	if (s->f && fflush(s->f) != 0 && err == NULL)
4637 		err = got_error_from_errno("fflush");
4638 	return err;
4639 }
4640 
4641 static void
4642 diff_view_indicate_progress(struct tog_view *view)
4643 {
4644 	mvwaddstr(view->window, 0, 0, "diffing...");
4645 	update_panels();
4646 	doupdate();
4647 }
4648 
4649 static const struct got_error *
4650 search_start_diff_view(struct tog_view *view)
4651 {
4652 	struct tog_diff_view_state *s = &view->state.diff;
4653 
4654 	s->matched_line = 0;
4655 	return NULL;
4656 }
4657 
4658 static const struct got_error *
4659 search_next_diff_view(struct tog_view *view)
4660 {
4661 	struct tog_diff_view_state *s = &view->state.diff;
4662 	const struct got_error *err = NULL;
4663 	int lineno;
4664 	char *line = NULL;
4665 	size_t linesize = 0;
4666 	ssize_t linelen;
4667 
4668 	if (!view->searching) {
4669 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4670 		return NULL;
4671 	}
4672 
4673 	if (s->matched_line) {
4674 		if (view->searching == TOG_SEARCH_FORWARD)
4675 			lineno = s->matched_line + 1;
4676 		else
4677 			lineno = s->matched_line - 1;
4678 	} else
4679 		lineno = s->first_displayed_line;
4680 
4681 	while (1) {
4682 		off_t offset;
4683 
4684 		if (lineno <= 0 || lineno > s->nlines) {
4685 			if (s->matched_line == 0) {
4686 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4687 				break;
4688 			}
4689 
4690 			if (view->searching == TOG_SEARCH_FORWARD)
4691 				lineno = 1;
4692 			else
4693 				lineno = s->nlines;
4694 		}
4695 
4696 		offset = s->lines[lineno - 1].offset;
4697 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4698 			free(line);
4699 			return got_error_from_errno("fseeko");
4700 		}
4701 		linelen = getline(&line, &linesize, s->f);
4702 		if (linelen != -1) {
4703 			char *exstr;
4704 			err = expand_tab(&exstr, line);
4705 			if (err)
4706 				break;
4707 			if (match_line(exstr, &view->regex, 1,
4708 			    &view->regmatch)) {
4709 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4710 				s->matched_line = lineno;
4711 				free(exstr);
4712 				break;
4713 			}
4714 			free(exstr);
4715 		}
4716 		if (view->searching == TOG_SEARCH_FORWARD)
4717 			lineno++;
4718 		else
4719 			lineno--;
4720 	}
4721 	free(line);
4722 
4723 	if (s->matched_line) {
4724 		s->first_displayed_line = s->matched_line;
4725 		s->selected_line = 1;
4726 	}
4727 
4728 	return err;
4729 }
4730 
4731 static const struct got_error *
4732 close_diff_view(struct tog_view *view)
4733 {
4734 	const struct got_error *err = NULL;
4735 	struct tog_diff_view_state *s = &view->state.diff;
4736 
4737 	free(s->id1);
4738 	s->id1 = NULL;
4739 	free(s->id2);
4740 	s->id2 = NULL;
4741 	if (s->f && fclose(s->f) == EOF)
4742 		err = got_error_from_errno("fclose");
4743 	s->f = NULL;
4744 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4745 		err = got_error_from_errno("fclose");
4746 	s->f1 = NULL;
4747 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4748 		err = got_error_from_errno("fclose");
4749 	s->f2 = NULL;
4750 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4751 		err = got_error_from_errno("close");
4752 	s->fd1 = -1;
4753 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4754 		err = got_error_from_errno("close");
4755 	s->fd2 = -1;
4756 	free(s->lines);
4757 	s->lines = NULL;
4758 	s->nlines = 0;
4759 	return err;
4760 }
4761 
4762 static const struct got_error *
4763 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4764     struct got_object_id *id2, const char *label1, const char *label2,
4765     int diff_context, int ignore_whitespace, int force_text_diff,
4766     struct tog_view *parent_view, struct got_repository *repo)
4767 {
4768 	const struct got_error *err;
4769 	struct tog_diff_view_state *s = &view->state.diff;
4770 
4771 	memset(s, 0, sizeof(*s));
4772 	s->fd1 = -1;
4773 	s->fd2 = -1;
4774 
4775 	if (id1 != NULL && id2 != NULL) {
4776 	    int type1, type2;
4777 	    err = got_object_get_type(&type1, repo, id1);
4778 	    if (err)
4779 		return err;
4780 	    err = got_object_get_type(&type2, repo, id2);
4781 	    if (err)
4782 		return err;
4783 
4784 	    if (type1 != type2)
4785 		return got_error(GOT_ERR_OBJ_TYPE);
4786 	}
4787 	s->first_displayed_line = 1;
4788 	s->last_displayed_line = view->nlines;
4789 	s->selected_line = 1;
4790 	s->repo = repo;
4791 	s->id1 = id1;
4792 	s->id2 = id2;
4793 	s->label1 = label1;
4794 	s->label2 = label2;
4795 
4796 	if (id1) {
4797 		s->id1 = got_object_id_dup(id1);
4798 		if (s->id1 == NULL)
4799 			return got_error_from_errno("got_object_id_dup");
4800 	} else
4801 		s->id1 = NULL;
4802 
4803 	s->id2 = got_object_id_dup(id2);
4804 	if (s->id2 == NULL) {
4805 		err = got_error_from_errno("got_object_id_dup");
4806 		goto done;
4807 	}
4808 
4809 	s->f1 = got_opentemp();
4810 	if (s->f1 == NULL) {
4811 		err = got_error_from_errno("got_opentemp");
4812 		goto done;
4813 	}
4814 
4815 	s->f2 = got_opentemp();
4816 	if (s->f2 == NULL) {
4817 		err = got_error_from_errno("got_opentemp");
4818 		goto done;
4819 	}
4820 
4821 	s->fd1 = got_opentempfd();
4822 	if (s->fd1 == -1) {
4823 		err = got_error_from_errno("got_opentempfd");
4824 		goto done;
4825 	}
4826 
4827 	s->fd2 = got_opentempfd();
4828 	if (s->fd2 == -1) {
4829 		err = got_error_from_errno("got_opentempfd");
4830 		goto done;
4831 	}
4832 
4833 	s->first_displayed_line = 1;
4834 	s->last_displayed_line = view->nlines;
4835 	s->diff_context = diff_context;
4836 	s->ignore_whitespace = ignore_whitespace;
4837 	s->force_text_diff = force_text_diff;
4838 	s->parent_view = parent_view;
4839 	s->repo = repo;
4840 
4841 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4842 		int rc;
4843 
4844 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4845 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4846 		if (rc != ERR)
4847 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4848 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4849 		if (rc != ERR)
4850 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4851 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4852 		if (rc != ERR)
4853 			rc = init_pair(GOT_DIFF_LINE_META,
4854 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4855 		if (rc != ERR)
4856 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4857 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4858 		if (rc != ERR)
4859 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4860 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4861 		if (rc != ERR)
4862 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4863 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4864 		if (rc != ERR)
4865 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4866 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4867 		if (rc != ERR)
4868 			rc = init_pair(GOT_DIFF_LINE_DATE,
4869 			    get_color_value("TOG_COLOR_DATE"), -1);
4870 		if (rc == ERR) {
4871 			err = got_error(GOT_ERR_RANGE);
4872 			goto done;
4873 		}
4874 	}
4875 
4876 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4877 	    view_is_splitscreen(view))
4878 		show_log_view(parent_view); /* draw border */
4879 	diff_view_indicate_progress(view);
4880 
4881 	err = create_diff(s);
4882 
4883 	view->show = show_diff_view;
4884 	view->input = input_diff_view;
4885 	view->reset = reset_diff_view;
4886 	view->close = close_diff_view;
4887 	view->search_start = search_start_diff_view;
4888 	view->search_next = search_next_diff_view;
4889 done:
4890 	if (err)
4891 		close_diff_view(view);
4892 	return err;
4893 }
4894 
4895 static const struct got_error *
4896 show_diff_view(struct tog_view *view)
4897 {
4898 	const struct got_error *err;
4899 	struct tog_diff_view_state *s = &view->state.diff;
4900 	char *id_str1 = NULL, *id_str2, *header;
4901 	const char *label1, *label2;
4902 
4903 	if (s->id1) {
4904 		err = got_object_id_str(&id_str1, s->id1);
4905 		if (err)
4906 			return err;
4907 		label1 = s->label1 ? s->label1 : id_str1;
4908 	} else
4909 		label1 = "/dev/null";
4910 
4911 	err = got_object_id_str(&id_str2, s->id2);
4912 	if (err)
4913 		return err;
4914 	label2 = s->label2 ? s->label2 : id_str2;
4915 
4916 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4917 		err = got_error_from_errno("asprintf");
4918 		free(id_str1);
4919 		free(id_str2);
4920 		return err;
4921 	}
4922 	free(id_str1);
4923 	free(id_str2);
4924 
4925 	err = draw_file(view, header);
4926 	free(header);
4927 	return err;
4928 }
4929 
4930 static const struct got_error *
4931 set_selected_commit(struct tog_diff_view_state *s,
4932     struct commit_queue_entry *entry)
4933 {
4934 	const struct got_error *err;
4935 	const struct got_object_id_queue *parent_ids;
4936 	struct got_commit_object *selected_commit;
4937 	struct got_object_qid *pid;
4938 
4939 	free(s->id2);
4940 	s->id2 = got_object_id_dup(entry->id);
4941 	if (s->id2 == NULL)
4942 		return got_error_from_errno("got_object_id_dup");
4943 
4944 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4945 	if (err)
4946 		return err;
4947 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4948 	free(s->id1);
4949 	pid = STAILQ_FIRST(parent_ids);
4950 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4951 	got_object_commit_close(selected_commit);
4952 	return NULL;
4953 }
4954 
4955 static const struct got_error *
4956 reset_diff_view(struct tog_view *view)
4957 {
4958 	struct tog_diff_view_state *s = &view->state.diff;
4959 
4960 	view->count = 0;
4961 	wclear(view->window);
4962 	s->first_displayed_line = 1;
4963 	s->last_displayed_line = view->nlines;
4964 	s->matched_line = 0;
4965 	diff_view_indicate_progress(view);
4966 	return create_diff(s);
4967 }
4968 
4969 static void
4970 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4971 {
4972 	int start, i;
4973 
4974 	i = start = s->first_displayed_line - 1;
4975 
4976 	while (s->lines[i].type != type) {
4977 		if (i == 0)
4978 			i = s->nlines - 1;
4979 		if (--i == start)
4980 			return; /* do nothing, requested type not in file */
4981 	}
4982 
4983 	s->selected_line = 1;
4984 	s->first_displayed_line = i;
4985 }
4986 
4987 static void
4988 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4989 {
4990 	int start, i;
4991 
4992 	i = start = s->first_displayed_line + 1;
4993 
4994 	while (s->lines[i].type != type) {
4995 		if (i == s->nlines - 1)
4996 			i = 0;
4997 		if (++i == start)
4998 			return; /* do nothing, requested type not in file */
4999 	}
5000 
5001 	s->selected_line = 1;
5002 	s->first_displayed_line = i;
5003 }
5004 
5005 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5006     int, int, int);
5007 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5008     int, int);
5009 
5010 static const struct got_error *
5011 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5012 {
5013 	const struct got_error *err = NULL;
5014 	struct tog_diff_view_state *s = &view->state.diff;
5015 	struct tog_log_view_state *ls;
5016 	struct commit_queue_entry *old_selected_entry;
5017 	char *line = NULL;
5018 	size_t linesize = 0;
5019 	ssize_t linelen;
5020 	int i, nscroll = view->nlines - 1, up = 0;
5021 
5022 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5023 
5024 	switch (ch) {
5025 	case '0':
5026 		view->x = 0;
5027 		break;
5028 	case '$':
5029 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5030 		view->count = 0;
5031 		break;
5032 	case KEY_RIGHT:
5033 	case 'l':
5034 		if (view->x + view->ncols / 3 < view->maxx)
5035 			view->x += 2;  /* move two columns right */
5036 		else
5037 			view->count = 0;
5038 		break;
5039 	case KEY_LEFT:
5040 	case 'h':
5041 		view->x -= MIN(view->x, 2);  /* move two columns back */
5042 		if (view->x <= 0)
5043 			view->count = 0;
5044 		break;
5045 	case 'a':
5046 	case 'w':
5047 		if (ch == 'a')
5048 			s->force_text_diff = !s->force_text_diff;
5049 		if (ch == 'w')
5050 			s->ignore_whitespace = !s->ignore_whitespace;
5051 		err = reset_diff_view(view);
5052 		break;
5053 	case 'g':
5054 	case KEY_HOME:
5055 		s->first_displayed_line = 1;
5056 		view->count = 0;
5057 		break;
5058 	case 'G':
5059 	case KEY_END:
5060 		view->count = 0;
5061 		if (s->eof)
5062 			break;
5063 
5064 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5065 		s->eof = 1;
5066 		break;
5067 	case 'k':
5068 	case KEY_UP:
5069 	case CTRL('p'):
5070 		if (s->first_displayed_line > 1)
5071 			s->first_displayed_line--;
5072 		else
5073 			view->count = 0;
5074 		break;
5075 	case CTRL('u'):
5076 	case 'u':
5077 		nscroll /= 2;
5078 		/* FALL THROUGH */
5079 	case KEY_PPAGE:
5080 	case CTRL('b'):
5081 	case 'b':
5082 		if (s->first_displayed_line == 1) {
5083 			view->count = 0;
5084 			break;
5085 		}
5086 		i = 0;
5087 		while (i++ < nscroll && s->first_displayed_line > 1)
5088 			s->first_displayed_line--;
5089 		break;
5090 	case 'j':
5091 	case KEY_DOWN:
5092 	case CTRL('n'):
5093 		if (!s->eof)
5094 			s->first_displayed_line++;
5095 		else
5096 			view->count = 0;
5097 		break;
5098 	case CTRL('d'):
5099 	case 'd':
5100 		nscroll /= 2;
5101 		/* FALL THROUGH */
5102 	case KEY_NPAGE:
5103 	case CTRL('f'):
5104 	case 'f':
5105 	case ' ':
5106 		if (s->eof) {
5107 			view->count = 0;
5108 			break;
5109 		}
5110 		i = 0;
5111 		while (!s->eof && i++ < nscroll) {
5112 			linelen = getline(&line, &linesize, s->f);
5113 			s->first_displayed_line++;
5114 			if (linelen == -1) {
5115 				if (feof(s->f)) {
5116 					s->eof = 1;
5117 				} else
5118 					err = got_ferror(s->f, GOT_ERR_IO);
5119 				break;
5120 			}
5121 		}
5122 		free(line);
5123 		break;
5124 	case '(':
5125 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5126 		break;
5127 	case ')':
5128 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5129 		break;
5130 	case '{':
5131 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5132 		break;
5133 	case '}':
5134 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5135 		break;
5136 	case '[':
5137 		if (s->diff_context > 0) {
5138 			s->diff_context--;
5139 			s->matched_line = 0;
5140 			diff_view_indicate_progress(view);
5141 			err = create_diff(s);
5142 			if (s->first_displayed_line + view->nlines - 1 >
5143 			    s->nlines) {
5144 				s->first_displayed_line = 1;
5145 				s->last_displayed_line = view->nlines;
5146 			}
5147 		} else
5148 			view->count = 0;
5149 		break;
5150 	case ']':
5151 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5152 			s->diff_context++;
5153 			s->matched_line = 0;
5154 			diff_view_indicate_progress(view);
5155 			err = create_diff(s);
5156 		} else
5157 			view->count = 0;
5158 		break;
5159 	case '<':
5160 	case ',':
5161 	case 'K':
5162 		up = 1;
5163 		/* FALL THROUGH */
5164 	case '>':
5165 	case '.':
5166 	case 'J':
5167 		if (s->parent_view == NULL) {
5168 			view->count = 0;
5169 			break;
5170 		}
5171 		s->parent_view->count = view->count;
5172 
5173 		if (s->parent_view->type == TOG_VIEW_LOG) {
5174 			ls = &s->parent_view->state.log;
5175 			old_selected_entry = ls->selected_entry;
5176 
5177 			err = input_log_view(NULL, s->parent_view,
5178 			    up ? KEY_UP : KEY_DOWN);
5179 			if (err)
5180 				break;
5181 			view->count = s->parent_view->count;
5182 
5183 			if (old_selected_entry == ls->selected_entry)
5184 				break;
5185 
5186 			err = set_selected_commit(s, ls->selected_entry);
5187 			if (err)
5188 				break;
5189 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5190 			struct tog_blame_view_state *bs;
5191 			struct got_object_id *id, *prev_id;
5192 
5193 			bs = &s->parent_view->state.blame;
5194 			prev_id = get_annotation_for_line(bs->blame.lines,
5195 			    bs->blame.nlines, bs->last_diffed_line);
5196 
5197 			err = input_blame_view(&view, s->parent_view,
5198 			    up ? KEY_UP : KEY_DOWN);
5199 			if (err)
5200 				break;
5201 			view->count = s->parent_view->count;
5202 
5203 			if (prev_id == NULL)
5204 				break;
5205 			id = get_selected_commit_id(bs->blame.lines,
5206 			    bs->blame.nlines, bs->first_displayed_line,
5207 			    bs->selected_line);
5208 			if (id == NULL)
5209 				break;
5210 
5211 			if (!got_object_id_cmp(prev_id, id))
5212 				break;
5213 
5214 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5215 			if (err)
5216 				break;
5217 		}
5218 		s->first_displayed_line = 1;
5219 		s->last_displayed_line = view->nlines;
5220 		s->matched_line = 0;
5221 		view->x = 0;
5222 
5223 		diff_view_indicate_progress(view);
5224 		err = create_diff(s);
5225 		break;
5226 	default:
5227 		view->count = 0;
5228 		break;
5229 	}
5230 
5231 	return err;
5232 }
5233 
5234 static const struct got_error *
5235 cmd_diff(int argc, char *argv[])
5236 {
5237 	const struct got_error *error = NULL;
5238 	struct got_repository *repo = NULL;
5239 	struct got_worktree *worktree = NULL;
5240 	struct got_object_id *id1 = NULL, *id2 = NULL;
5241 	char *repo_path = NULL, *cwd = NULL;
5242 	char *id_str1 = NULL, *id_str2 = NULL;
5243 	char *label1 = NULL, *label2 = NULL;
5244 	int diff_context = 3, ignore_whitespace = 0;
5245 	int ch, force_text_diff = 0;
5246 	const char *errstr;
5247 	struct tog_view *view;
5248 	int *pack_fds = NULL;
5249 
5250 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5251 		switch (ch) {
5252 		case 'a':
5253 			force_text_diff = 1;
5254 			break;
5255 		case 'C':
5256 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5257 			    &errstr);
5258 			if (errstr != NULL)
5259 				errx(1, "number of context lines is %s: %s",
5260 				    errstr, errstr);
5261 			break;
5262 		case 'r':
5263 			repo_path = realpath(optarg, NULL);
5264 			if (repo_path == NULL)
5265 				return got_error_from_errno2("realpath",
5266 				    optarg);
5267 			got_path_strip_trailing_slashes(repo_path);
5268 			break;
5269 		case 'w':
5270 			ignore_whitespace = 1;
5271 			break;
5272 		default:
5273 			usage_diff();
5274 			/* NOTREACHED */
5275 		}
5276 	}
5277 
5278 	argc -= optind;
5279 	argv += optind;
5280 
5281 	if (argc == 0) {
5282 		usage_diff(); /* TODO show local worktree changes */
5283 	} else if (argc == 2) {
5284 		id_str1 = argv[0];
5285 		id_str2 = argv[1];
5286 	} else
5287 		usage_diff();
5288 
5289 	error = got_repo_pack_fds_open(&pack_fds);
5290 	if (error)
5291 		goto done;
5292 
5293 	if (repo_path == NULL) {
5294 		cwd = getcwd(NULL, 0);
5295 		if (cwd == NULL)
5296 			return got_error_from_errno("getcwd");
5297 		error = got_worktree_open(&worktree, cwd);
5298 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5299 			goto done;
5300 		if (worktree)
5301 			repo_path =
5302 			    strdup(got_worktree_get_repo_path(worktree));
5303 		else
5304 			repo_path = strdup(cwd);
5305 		if (repo_path == NULL) {
5306 			error = got_error_from_errno("strdup");
5307 			goto done;
5308 		}
5309 	}
5310 
5311 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5312 	if (error)
5313 		goto done;
5314 
5315 	init_curses();
5316 
5317 	error = apply_unveil(got_repo_get_path(repo), NULL);
5318 	if (error)
5319 		goto done;
5320 
5321 	error = tog_load_refs(repo, 0);
5322 	if (error)
5323 		goto done;
5324 
5325 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5326 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5327 	if (error)
5328 		goto done;
5329 
5330 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5331 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5332 	if (error)
5333 		goto done;
5334 
5335 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5336 	if (view == NULL) {
5337 		error = got_error_from_errno("view_open");
5338 		goto done;
5339 	}
5340 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5341 	    ignore_whitespace, force_text_diff, NULL,  repo);
5342 	if (error)
5343 		goto done;
5344 	error = view_loop(view);
5345 done:
5346 	free(label1);
5347 	free(label2);
5348 	free(repo_path);
5349 	free(cwd);
5350 	if (repo) {
5351 		const struct got_error *close_err = got_repo_close(repo);
5352 		if (error == NULL)
5353 			error = close_err;
5354 	}
5355 	if (worktree)
5356 		got_worktree_close(worktree);
5357 	if (pack_fds) {
5358 		const struct got_error *pack_err =
5359 		    got_repo_pack_fds_close(pack_fds);
5360 		if (error == NULL)
5361 			error = pack_err;
5362 	}
5363 	tog_free_refs();
5364 	return error;
5365 }
5366 
5367 __dead static void
5368 usage_blame(void)
5369 {
5370 	endwin();
5371 	fprintf(stderr,
5372 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5373 	    getprogname());
5374 	exit(1);
5375 }
5376 
5377 struct tog_blame_line {
5378 	int annotated;
5379 	struct got_object_id *id;
5380 };
5381 
5382 static const struct got_error *
5383 draw_blame(struct tog_view *view)
5384 {
5385 	struct tog_blame_view_state *s = &view->state.blame;
5386 	struct tog_blame *blame = &s->blame;
5387 	regmatch_t *regmatch = &view->regmatch;
5388 	const struct got_error *err;
5389 	int lineno = 0, nprinted = 0;
5390 	char *line = NULL;
5391 	size_t linesize = 0;
5392 	ssize_t linelen;
5393 	wchar_t *wline;
5394 	int width;
5395 	struct tog_blame_line *blame_line;
5396 	struct got_object_id *prev_id = NULL;
5397 	char *id_str;
5398 	struct tog_color *tc;
5399 
5400 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5401 	if (err)
5402 		return err;
5403 
5404 	rewind(blame->f);
5405 	werase(view->window);
5406 
5407 	if (asprintf(&line, "commit %s", id_str) == -1) {
5408 		err = got_error_from_errno("asprintf");
5409 		free(id_str);
5410 		return err;
5411 	}
5412 
5413 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5414 	free(line);
5415 	line = NULL;
5416 	if (err)
5417 		return err;
5418 	if (view_needs_focus_indication(view))
5419 		wstandout(view->window);
5420 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5421 	if (tc)
5422 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5423 	waddwstr(view->window, wline);
5424 	while (width++ < view->ncols)
5425 		waddch(view->window, ' ');
5426 	if (tc)
5427 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5428 	if (view_needs_focus_indication(view))
5429 		wstandend(view->window);
5430 	free(wline);
5431 	wline = NULL;
5432 
5433 	if (view->gline > blame->nlines)
5434 		view->gline = blame->nlines;
5435 
5436 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5437 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5438 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5439 		free(id_str);
5440 		return got_error_from_errno("asprintf");
5441 	}
5442 	free(id_str);
5443 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5444 	free(line);
5445 	line = NULL;
5446 	if (err)
5447 		return err;
5448 	waddwstr(view->window, wline);
5449 	free(wline);
5450 	wline = NULL;
5451 	if (width < view->ncols - 1)
5452 		waddch(view->window, '\n');
5453 
5454 	s->eof = 0;
5455 	view->maxx = 0;
5456 	while (nprinted < view->nlines - 2) {
5457 		linelen = getline(&line, &linesize, blame->f);
5458 		if (linelen == -1) {
5459 			if (feof(blame->f)) {
5460 				s->eof = 1;
5461 				break;
5462 			}
5463 			free(line);
5464 			return got_ferror(blame->f, GOT_ERR_IO);
5465 		}
5466 		if (++lineno < s->first_displayed_line)
5467 			continue;
5468 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5469 			continue;
5470 
5471 		/* Set view->maxx based on full line length. */
5472 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5473 		if (err) {
5474 			free(line);
5475 			return err;
5476 		}
5477 		free(wline);
5478 		wline = NULL;
5479 		view->maxx = MAX(view->maxx, width);
5480 
5481 		if (nprinted == s->selected_line - 1)
5482 			wstandout(view->window);
5483 
5484 		if (blame->nlines > 0) {
5485 			blame_line = &blame->lines[lineno - 1];
5486 			if (blame_line->annotated && prev_id &&
5487 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5488 			    !(nprinted == s->selected_line - 1)) {
5489 				waddstr(view->window, "        ");
5490 			} else if (blame_line->annotated) {
5491 				char *id_str;
5492 				err = got_object_id_str(&id_str,
5493 				    blame_line->id);
5494 				if (err) {
5495 					free(line);
5496 					return err;
5497 				}
5498 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5499 				if (tc)
5500 					wattr_on(view->window,
5501 					    COLOR_PAIR(tc->colorpair), NULL);
5502 				wprintw(view->window, "%.8s", id_str);
5503 				if (tc)
5504 					wattr_off(view->window,
5505 					    COLOR_PAIR(tc->colorpair), NULL);
5506 				free(id_str);
5507 				prev_id = blame_line->id;
5508 			} else {
5509 				waddstr(view->window, "........");
5510 				prev_id = NULL;
5511 			}
5512 		} else {
5513 			waddstr(view->window, "........");
5514 			prev_id = NULL;
5515 		}
5516 
5517 		if (nprinted == s->selected_line - 1)
5518 			wstandend(view->window);
5519 		waddstr(view->window, " ");
5520 
5521 		if (view->ncols <= 9) {
5522 			width = 9;
5523 		} else if (s->first_displayed_line + nprinted ==
5524 		    s->matched_line &&
5525 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5526 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5527 			    view->window, view->x, regmatch);
5528 			if (err) {
5529 				free(line);
5530 				return err;
5531 			}
5532 			width += 9;
5533 		} else {
5534 			int skip;
5535 			err = format_line(&wline, &width, &skip, line,
5536 			    view->x, view->ncols - 9, 9, 1);
5537 			if (err) {
5538 				free(line);
5539 				return err;
5540 			}
5541 			waddwstr(view->window, &wline[skip]);
5542 			width += 9;
5543 			free(wline);
5544 			wline = NULL;
5545 		}
5546 
5547 		if (width <= view->ncols - 1)
5548 			waddch(view->window, '\n');
5549 		if (++nprinted == 1)
5550 			s->first_displayed_line = lineno;
5551 	}
5552 	free(line);
5553 	s->last_displayed_line = lineno;
5554 
5555 	view_border(view);
5556 
5557 	return NULL;
5558 }
5559 
5560 static const struct got_error *
5561 blame_cb(void *arg, int nlines, int lineno,
5562     struct got_commit_object *commit, struct got_object_id *id)
5563 {
5564 	const struct got_error *err = NULL;
5565 	struct tog_blame_cb_args *a = arg;
5566 	struct tog_blame_line *line;
5567 	int errcode;
5568 
5569 	if (nlines != a->nlines ||
5570 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5571 		return got_error(GOT_ERR_RANGE);
5572 
5573 	errcode = pthread_mutex_lock(&tog_mutex);
5574 	if (errcode)
5575 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5576 
5577 	if (*a->quit) {	/* user has quit the blame view */
5578 		err = got_error(GOT_ERR_ITER_COMPLETED);
5579 		goto done;
5580 	}
5581 
5582 	if (lineno == -1)
5583 		goto done; /* no change in this commit */
5584 
5585 	line = &a->lines[lineno - 1];
5586 	if (line->annotated)
5587 		goto done;
5588 
5589 	line->id = got_object_id_dup(id);
5590 	if (line->id == NULL) {
5591 		err = got_error_from_errno("got_object_id_dup");
5592 		goto done;
5593 	}
5594 	line->annotated = 1;
5595 done:
5596 	errcode = pthread_mutex_unlock(&tog_mutex);
5597 	if (errcode)
5598 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5599 	return err;
5600 }
5601 
5602 static void *
5603 blame_thread(void *arg)
5604 {
5605 	const struct got_error *err, *close_err;
5606 	struct tog_blame_thread_args *ta = arg;
5607 	struct tog_blame_cb_args *a = ta->cb_args;
5608 	int errcode, fd1 = -1, fd2 = -1;
5609 	FILE *f1 = NULL, *f2 = NULL;
5610 
5611 	fd1 = got_opentempfd();
5612 	if (fd1 == -1)
5613 		return (void *)got_error_from_errno("got_opentempfd");
5614 
5615 	fd2 = got_opentempfd();
5616 	if (fd2 == -1) {
5617 		err = got_error_from_errno("got_opentempfd");
5618 		goto done;
5619 	}
5620 
5621 	f1 = got_opentemp();
5622 	if (f1 == NULL) {
5623 		err = (void *)got_error_from_errno("got_opentemp");
5624 		goto done;
5625 	}
5626 	f2 = got_opentemp();
5627 	if (f2 == NULL) {
5628 		err = (void *)got_error_from_errno("got_opentemp");
5629 		goto done;
5630 	}
5631 
5632 	err = block_signals_used_by_main_thread();
5633 	if (err)
5634 		goto done;
5635 
5636 	err = got_blame(ta->path, a->commit_id, ta->repo,
5637 	    tog_diff_algo, blame_cb, ta->cb_args,
5638 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5639 	if (err && err->code == GOT_ERR_CANCELLED)
5640 		err = NULL;
5641 
5642 	errcode = pthread_mutex_lock(&tog_mutex);
5643 	if (errcode) {
5644 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5645 		goto done;
5646 	}
5647 
5648 	close_err = got_repo_close(ta->repo);
5649 	if (err == NULL)
5650 		err = close_err;
5651 	ta->repo = NULL;
5652 	*ta->complete = 1;
5653 
5654 	errcode = pthread_mutex_unlock(&tog_mutex);
5655 	if (errcode && err == NULL)
5656 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5657 
5658 done:
5659 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5660 		err = got_error_from_errno("close");
5661 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5662 		err = got_error_from_errno("close");
5663 	if (f1 && fclose(f1) == EOF && err == NULL)
5664 		err = got_error_from_errno("fclose");
5665 	if (f2 && fclose(f2) == EOF && err == NULL)
5666 		err = got_error_from_errno("fclose");
5667 
5668 	return (void *)err;
5669 }
5670 
5671 static struct got_object_id *
5672 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5673     int first_displayed_line, int selected_line)
5674 {
5675 	struct tog_blame_line *line;
5676 
5677 	if (nlines <= 0)
5678 		return NULL;
5679 
5680 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5681 	if (!line->annotated)
5682 		return NULL;
5683 
5684 	return line->id;
5685 }
5686 
5687 static struct got_object_id *
5688 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5689     int lineno)
5690 {
5691 	struct tog_blame_line *line;
5692 
5693 	if (nlines <= 0 || lineno >= nlines)
5694 		return NULL;
5695 
5696 	line = &lines[lineno - 1];
5697 	if (!line->annotated)
5698 		return NULL;
5699 
5700 	return line->id;
5701 }
5702 
5703 static const struct got_error *
5704 stop_blame(struct tog_blame *blame)
5705 {
5706 	const struct got_error *err = NULL;
5707 	int i;
5708 
5709 	if (blame->thread) {
5710 		int errcode;
5711 		errcode = pthread_mutex_unlock(&tog_mutex);
5712 		if (errcode)
5713 			return got_error_set_errno(errcode,
5714 			    "pthread_mutex_unlock");
5715 		errcode = pthread_join(blame->thread, (void **)&err);
5716 		if (errcode)
5717 			return got_error_set_errno(errcode, "pthread_join");
5718 		errcode = pthread_mutex_lock(&tog_mutex);
5719 		if (errcode)
5720 			return got_error_set_errno(errcode,
5721 			    "pthread_mutex_lock");
5722 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5723 			err = NULL;
5724 		blame->thread = NULL;
5725 	}
5726 	if (blame->thread_args.repo) {
5727 		const struct got_error *close_err;
5728 		close_err = got_repo_close(blame->thread_args.repo);
5729 		if (err == NULL)
5730 			err = close_err;
5731 		blame->thread_args.repo = NULL;
5732 	}
5733 	if (blame->f) {
5734 		if (fclose(blame->f) == EOF && err == NULL)
5735 			err = got_error_from_errno("fclose");
5736 		blame->f = NULL;
5737 	}
5738 	if (blame->lines) {
5739 		for (i = 0; i < blame->nlines; i++)
5740 			free(blame->lines[i].id);
5741 		free(blame->lines);
5742 		blame->lines = NULL;
5743 	}
5744 	free(blame->cb_args.commit_id);
5745 	blame->cb_args.commit_id = NULL;
5746 	if (blame->pack_fds) {
5747 		const struct got_error *pack_err =
5748 		    got_repo_pack_fds_close(blame->pack_fds);
5749 		if (err == NULL)
5750 			err = pack_err;
5751 		blame->pack_fds = NULL;
5752 	}
5753 	return err;
5754 }
5755 
5756 static const struct got_error *
5757 cancel_blame_view(void *arg)
5758 {
5759 	const struct got_error *err = NULL;
5760 	int *done = arg;
5761 	int errcode;
5762 
5763 	errcode = pthread_mutex_lock(&tog_mutex);
5764 	if (errcode)
5765 		return got_error_set_errno(errcode,
5766 		    "pthread_mutex_unlock");
5767 
5768 	if (*done)
5769 		err = got_error(GOT_ERR_CANCELLED);
5770 
5771 	errcode = pthread_mutex_unlock(&tog_mutex);
5772 	if (errcode)
5773 		return got_error_set_errno(errcode,
5774 		    "pthread_mutex_lock");
5775 
5776 	return err;
5777 }
5778 
5779 static const struct got_error *
5780 run_blame(struct tog_view *view)
5781 {
5782 	struct tog_blame_view_state *s = &view->state.blame;
5783 	struct tog_blame *blame = &s->blame;
5784 	const struct got_error *err = NULL;
5785 	struct got_commit_object *commit = NULL;
5786 	struct got_blob_object *blob = NULL;
5787 	struct got_repository *thread_repo = NULL;
5788 	struct got_object_id *obj_id = NULL;
5789 	int obj_type, fd = -1;
5790 	int *pack_fds = NULL;
5791 
5792 	err = got_object_open_as_commit(&commit, s->repo,
5793 	    &s->blamed_commit->id);
5794 	if (err)
5795 		return err;
5796 
5797 	fd = got_opentempfd();
5798 	if (fd == -1) {
5799 		err = got_error_from_errno("got_opentempfd");
5800 		goto done;
5801 	}
5802 
5803 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5804 	if (err)
5805 		goto done;
5806 
5807 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5808 	if (err)
5809 		goto done;
5810 
5811 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5812 		err = got_error(GOT_ERR_OBJ_TYPE);
5813 		goto done;
5814 	}
5815 
5816 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5817 	if (err)
5818 		goto done;
5819 	blame->f = got_opentemp();
5820 	if (blame->f == NULL) {
5821 		err = got_error_from_errno("got_opentemp");
5822 		goto done;
5823 	}
5824 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5825 	    &blame->line_offsets, blame->f, blob);
5826 	if (err)
5827 		goto done;
5828 	if (blame->nlines == 0) {
5829 		s->blame_complete = 1;
5830 		goto done;
5831 	}
5832 
5833 	/* Don't include \n at EOF in the blame line count. */
5834 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5835 		blame->nlines--;
5836 
5837 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5838 	if (blame->lines == NULL) {
5839 		err = got_error_from_errno("calloc");
5840 		goto done;
5841 	}
5842 
5843 	err = got_repo_pack_fds_open(&pack_fds);
5844 	if (err)
5845 		goto done;
5846 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5847 	    pack_fds);
5848 	if (err)
5849 		goto done;
5850 
5851 	blame->pack_fds = pack_fds;
5852 	blame->cb_args.view = view;
5853 	blame->cb_args.lines = blame->lines;
5854 	blame->cb_args.nlines = blame->nlines;
5855 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5856 	if (blame->cb_args.commit_id == NULL) {
5857 		err = got_error_from_errno("got_object_id_dup");
5858 		goto done;
5859 	}
5860 	blame->cb_args.quit = &s->done;
5861 
5862 	blame->thread_args.path = s->path;
5863 	blame->thread_args.repo = thread_repo;
5864 	blame->thread_args.cb_args = &blame->cb_args;
5865 	blame->thread_args.complete = &s->blame_complete;
5866 	blame->thread_args.cancel_cb = cancel_blame_view;
5867 	blame->thread_args.cancel_arg = &s->done;
5868 	s->blame_complete = 0;
5869 
5870 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5871 		s->first_displayed_line = 1;
5872 		s->last_displayed_line = view->nlines;
5873 		s->selected_line = 1;
5874 	}
5875 	s->matched_line = 0;
5876 
5877 done:
5878 	if (commit)
5879 		got_object_commit_close(commit);
5880 	if (fd != -1 && close(fd) == -1 && err == NULL)
5881 		err = got_error_from_errno("close");
5882 	if (blob)
5883 		got_object_blob_close(blob);
5884 	free(obj_id);
5885 	if (err)
5886 		stop_blame(blame);
5887 	return err;
5888 }
5889 
5890 static const struct got_error *
5891 open_blame_view(struct tog_view *view, char *path,
5892     struct got_object_id *commit_id, struct got_repository *repo)
5893 {
5894 	const struct got_error *err = NULL;
5895 	struct tog_blame_view_state *s = &view->state.blame;
5896 
5897 	STAILQ_INIT(&s->blamed_commits);
5898 
5899 	s->path = strdup(path);
5900 	if (s->path == NULL)
5901 		return got_error_from_errno("strdup");
5902 
5903 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5904 	if (err) {
5905 		free(s->path);
5906 		return err;
5907 	}
5908 
5909 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5910 	s->first_displayed_line = 1;
5911 	s->last_displayed_line = view->nlines;
5912 	s->selected_line = 1;
5913 	s->blame_complete = 0;
5914 	s->repo = repo;
5915 	s->commit_id = commit_id;
5916 	memset(&s->blame, 0, sizeof(s->blame));
5917 
5918 	STAILQ_INIT(&s->colors);
5919 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5920 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5921 		    get_color_value("TOG_COLOR_COMMIT"));
5922 		if (err)
5923 			return err;
5924 	}
5925 
5926 	view->show = show_blame_view;
5927 	view->input = input_blame_view;
5928 	view->reset = reset_blame_view;
5929 	view->close = close_blame_view;
5930 	view->search_start = search_start_blame_view;
5931 	view->search_next = search_next_blame_view;
5932 
5933 	return run_blame(view);
5934 }
5935 
5936 static const struct got_error *
5937 close_blame_view(struct tog_view *view)
5938 {
5939 	const struct got_error *err = NULL;
5940 	struct tog_blame_view_state *s = &view->state.blame;
5941 
5942 	if (s->blame.thread)
5943 		err = stop_blame(&s->blame);
5944 
5945 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5946 		struct got_object_qid *blamed_commit;
5947 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5948 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5949 		got_object_qid_free(blamed_commit);
5950 	}
5951 
5952 	free(s->path);
5953 	free_colors(&s->colors);
5954 	return err;
5955 }
5956 
5957 static const struct got_error *
5958 search_start_blame_view(struct tog_view *view)
5959 {
5960 	struct tog_blame_view_state *s = &view->state.blame;
5961 
5962 	s->matched_line = 0;
5963 	return NULL;
5964 }
5965 
5966 static const struct got_error *
5967 search_next_blame_view(struct tog_view *view)
5968 {
5969 	struct tog_blame_view_state *s = &view->state.blame;
5970 	const struct got_error *err = NULL;
5971 	int lineno;
5972 	char *line = NULL;
5973 	size_t linesize = 0;
5974 	ssize_t linelen;
5975 
5976 	if (!view->searching) {
5977 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5978 		return NULL;
5979 	}
5980 
5981 	if (s->matched_line) {
5982 		if (view->searching == TOG_SEARCH_FORWARD)
5983 			lineno = s->matched_line + 1;
5984 		else
5985 			lineno = s->matched_line - 1;
5986 	} else
5987 		lineno = s->first_displayed_line - 1 + s->selected_line;
5988 
5989 	while (1) {
5990 		off_t offset;
5991 
5992 		if (lineno <= 0 || lineno > s->blame.nlines) {
5993 			if (s->matched_line == 0) {
5994 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5995 				break;
5996 			}
5997 
5998 			if (view->searching == TOG_SEARCH_FORWARD)
5999 				lineno = 1;
6000 			else
6001 				lineno = s->blame.nlines;
6002 		}
6003 
6004 		offset = s->blame.line_offsets[lineno - 1];
6005 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
6006 			free(line);
6007 			return got_error_from_errno("fseeko");
6008 		}
6009 		linelen = getline(&line, &linesize, s->blame.f);
6010 		if (linelen != -1) {
6011 			char *exstr;
6012 			err = expand_tab(&exstr, line);
6013 			if (err)
6014 				break;
6015 			if (match_line(exstr, &view->regex, 1,
6016 			    &view->regmatch)) {
6017 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6018 				s->matched_line = lineno;
6019 				free(exstr);
6020 				break;
6021 			}
6022 			free(exstr);
6023 		}
6024 		if (view->searching == TOG_SEARCH_FORWARD)
6025 			lineno++;
6026 		else
6027 			lineno--;
6028 	}
6029 	free(line);
6030 
6031 	if (s->matched_line) {
6032 		s->first_displayed_line = s->matched_line;
6033 		s->selected_line = 1;
6034 	}
6035 
6036 	return err;
6037 }
6038 
6039 static const struct got_error *
6040 show_blame_view(struct tog_view *view)
6041 {
6042 	const struct got_error *err = NULL;
6043 	struct tog_blame_view_state *s = &view->state.blame;
6044 	int errcode;
6045 
6046 	if (s->blame.thread == NULL && !s->blame_complete) {
6047 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6048 		    &s->blame.thread_args);
6049 		if (errcode)
6050 			return got_error_set_errno(errcode, "pthread_create");
6051 
6052 		halfdelay(1); /* fast refresh while annotating  */
6053 	}
6054 
6055 	if (s->blame_complete)
6056 		halfdelay(10); /* disable fast refresh */
6057 
6058 	err = draw_blame(view);
6059 
6060 	view_border(view);
6061 	return err;
6062 }
6063 
6064 static const struct got_error *
6065 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6066     struct got_repository *repo, struct got_object_id *id)
6067 {
6068 	struct tog_view		*log_view;
6069 	const struct got_error	*err = NULL;
6070 
6071 	*new_view = NULL;
6072 
6073 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6074 	if (log_view == NULL)
6075 		return got_error_from_errno("view_open");
6076 
6077 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6078 	if (err)
6079 		view_close(log_view);
6080 	else
6081 		*new_view = log_view;
6082 
6083 	return err;
6084 }
6085 
6086 static const struct got_error *
6087 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6088 {
6089 	const struct got_error *err = NULL, *thread_err = NULL;
6090 	struct tog_view *diff_view;
6091 	struct tog_blame_view_state *s = &view->state.blame;
6092 	int eos, nscroll, begin_y = 0, begin_x = 0;
6093 
6094 	eos = nscroll = view->nlines - 2;
6095 	if (view_is_hsplit_top(view))
6096 		--eos;  /* border */
6097 
6098 	switch (ch) {
6099 	case '0':
6100 		view->x = 0;
6101 		break;
6102 	case '$':
6103 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6104 		view->count = 0;
6105 		break;
6106 	case KEY_RIGHT:
6107 	case 'l':
6108 		if (view->x + view->ncols / 3 < view->maxx)
6109 			view->x += 2;  /* move two columns right */
6110 		else
6111 			view->count = 0;
6112 		break;
6113 	case KEY_LEFT:
6114 	case 'h':
6115 		view->x -= MIN(view->x, 2);  /* move two columns back */
6116 		if (view->x <= 0)
6117 			view->count = 0;
6118 		break;
6119 	case 'q':
6120 		s->done = 1;
6121 		break;
6122 	case 'g':
6123 	case KEY_HOME:
6124 		s->selected_line = 1;
6125 		s->first_displayed_line = 1;
6126 		view->count = 0;
6127 		break;
6128 	case 'G':
6129 	case KEY_END:
6130 		if (s->blame.nlines < eos) {
6131 			s->selected_line = s->blame.nlines;
6132 			s->first_displayed_line = 1;
6133 		} else {
6134 			s->selected_line = eos;
6135 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6136 		}
6137 		view->count = 0;
6138 		break;
6139 	case 'k':
6140 	case KEY_UP:
6141 	case CTRL('p'):
6142 		if (s->selected_line > 1)
6143 			s->selected_line--;
6144 		else if (s->selected_line == 1 &&
6145 		    s->first_displayed_line > 1)
6146 			s->first_displayed_line--;
6147 		else
6148 			view->count = 0;
6149 		break;
6150 	case CTRL('u'):
6151 	case 'u':
6152 		nscroll /= 2;
6153 		/* FALL THROUGH */
6154 	case KEY_PPAGE:
6155 	case CTRL('b'):
6156 	case 'b':
6157 		if (s->first_displayed_line == 1) {
6158 			if (view->count > 1)
6159 				nscroll += nscroll;
6160 			s->selected_line = MAX(1, s->selected_line - nscroll);
6161 			view->count = 0;
6162 			break;
6163 		}
6164 		if (s->first_displayed_line > nscroll)
6165 			s->first_displayed_line -= nscroll;
6166 		else
6167 			s->first_displayed_line = 1;
6168 		break;
6169 	case 'j':
6170 	case KEY_DOWN:
6171 	case CTRL('n'):
6172 		if (s->selected_line < eos && s->first_displayed_line +
6173 		    s->selected_line <= s->blame.nlines)
6174 			s->selected_line++;
6175 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6176 			s->first_displayed_line++;
6177 		else
6178 			view->count = 0;
6179 		break;
6180 	case 'c':
6181 	case 'p': {
6182 		struct got_object_id *id = NULL;
6183 
6184 		view->count = 0;
6185 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6186 		    s->first_displayed_line, s->selected_line);
6187 		if (id == NULL)
6188 			break;
6189 		if (ch == 'p') {
6190 			struct got_commit_object *commit, *pcommit;
6191 			struct got_object_qid *pid;
6192 			struct got_object_id *blob_id = NULL;
6193 			int obj_type;
6194 			err = got_object_open_as_commit(&commit,
6195 			    s->repo, id);
6196 			if (err)
6197 				break;
6198 			pid = STAILQ_FIRST(
6199 			    got_object_commit_get_parent_ids(commit));
6200 			if (pid == NULL) {
6201 				got_object_commit_close(commit);
6202 				break;
6203 			}
6204 			/* Check if path history ends here. */
6205 			err = got_object_open_as_commit(&pcommit,
6206 			    s->repo, &pid->id);
6207 			if (err)
6208 				break;
6209 			err = got_object_id_by_path(&blob_id, s->repo,
6210 			    pcommit, s->path);
6211 			got_object_commit_close(pcommit);
6212 			if (err) {
6213 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6214 					err = NULL;
6215 				got_object_commit_close(commit);
6216 				break;
6217 			}
6218 			err = got_object_get_type(&obj_type, s->repo,
6219 			    blob_id);
6220 			free(blob_id);
6221 			/* Can't blame non-blob type objects. */
6222 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6223 				got_object_commit_close(commit);
6224 				break;
6225 			}
6226 			err = got_object_qid_alloc(&s->blamed_commit,
6227 			    &pid->id);
6228 			got_object_commit_close(commit);
6229 		} else {
6230 			if (got_object_id_cmp(id,
6231 			    &s->blamed_commit->id) == 0)
6232 				break;
6233 			err = got_object_qid_alloc(&s->blamed_commit,
6234 			    id);
6235 		}
6236 		if (err)
6237 			break;
6238 		s->done = 1;
6239 		thread_err = stop_blame(&s->blame);
6240 		s->done = 0;
6241 		if (thread_err)
6242 			break;
6243 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6244 		    s->blamed_commit, entry);
6245 		err = run_blame(view);
6246 		if (err)
6247 			break;
6248 		break;
6249 	}
6250 	case 'C': {
6251 		struct got_object_qid *first;
6252 
6253 		view->count = 0;
6254 		first = STAILQ_FIRST(&s->blamed_commits);
6255 		if (!got_object_id_cmp(&first->id, s->commit_id))
6256 			break;
6257 		s->done = 1;
6258 		thread_err = stop_blame(&s->blame);
6259 		s->done = 0;
6260 		if (thread_err)
6261 			break;
6262 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6263 		got_object_qid_free(s->blamed_commit);
6264 		s->blamed_commit =
6265 		    STAILQ_FIRST(&s->blamed_commits);
6266 		err = run_blame(view);
6267 		if (err)
6268 			break;
6269 		break;
6270 	}
6271 	case 'L':
6272 		view->count = 0;
6273 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6274 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6275 		if (s->id_to_log)
6276 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6277 		break;
6278 	case KEY_ENTER:
6279 	case '\r': {
6280 		struct got_object_id *id = NULL;
6281 		struct got_object_qid *pid;
6282 		struct got_commit_object *commit = NULL;
6283 
6284 		view->count = 0;
6285 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6286 		    s->first_displayed_line, s->selected_line);
6287 		if (id == NULL)
6288 			break;
6289 		err = got_object_open_as_commit(&commit, s->repo, id);
6290 		if (err)
6291 			break;
6292 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6293 		if (*new_view) {
6294 			/* traversed from diff view, release diff resources  */
6295 			err = close_diff_view(*new_view);
6296 			if (err)
6297 				break;
6298 			diff_view = *new_view;
6299 		} else {
6300 			if (view_is_parent_view(view))
6301 				view_get_split(view, &begin_y, &begin_x);
6302 
6303 			diff_view = view_open(0, 0, begin_y, begin_x,
6304 			    TOG_VIEW_DIFF);
6305 			if (diff_view == NULL) {
6306 				got_object_commit_close(commit);
6307 				err = got_error_from_errno("view_open");
6308 				break;
6309 			}
6310 		}
6311 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6312 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6313 		got_object_commit_close(commit);
6314 		if (err) {
6315 			view_close(diff_view);
6316 			break;
6317 		}
6318 		s->last_diffed_line = s->first_displayed_line - 1 +
6319 		    s->selected_line;
6320 		if (*new_view)
6321 			break;	/* still open from active diff view */
6322 		if (view_is_parent_view(view) &&
6323 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6324 			err = view_init_hsplit(view, begin_y);
6325 			if (err)
6326 				break;
6327 		}
6328 
6329 		view->focussed = 0;
6330 		diff_view->focussed = 1;
6331 		diff_view->mode = view->mode;
6332 		diff_view->nlines = view->lines - begin_y;
6333 		if (view_is_parent_view(view)) {
6334 			view_transfer_size(diff_view, view);
6335 			err = view_close_child(view);
6336 			if (err)
6337 				break;
6338 			err = view_set_child(view, diff_view);
6339 			if (err)
6340 				break;
6341 			view->focus_child = 1;
6342 		} else
6343 			*new_view = diff_view;
6344 		if (err)
6345 			break;
6346 		break;
6347 	}
6348 	case CTRL('d'):
6349 	case 'd':
6350 		nscroll /= 2;
6351 		/* FALL THROUGH */
6352 	case KEY_NPAGE:
6353 	case CTRL('f'):
6354 	case 'f':
6355 	case ' ':
6356 		if (s->last_displayed_line >= s->blame.nlines &&
6357 		    s->selected_line >= MIN(s->blame.nlines,
6358 		    view->nlines - 2)) {
6359 			view->count = 0;
6360 			break;
6361 		}
6362 		if (s->last_displayed_line >= s->blame.nlines &&
6363 		    s->selected_line < view->nlines - 2) {
6364 			s->selected_line +=
6365 			    MIN(nscroll, s->last_displayed_line -
6366 			    s->first_displayed_line - s->selected_line + 1);
6367 		}
6368 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6369 			s->first_displayed_line += nscroll;
6370 		else
6371 			s->first_displayed_line =
6372 			    s->blame.nlines - (view->nlines - 3);
6373 		break;
6374 	case KEY_RESIZE:
6375 		if (s->selected_line > view->nlines - 2) {
6376 			s->selected_line = MIN(s->blame.nlines,
6377 			    view->nlines - 2);
6378 		}
6379 		break;
6380 	default:
6381 		view->count = 0;
6382 		break;
6383 	}
6384 	return thread_err ? thread_err : err;
6385 }
6386 
6387 static const struct got_error *
6388 reset_blame_view(struct tog_view *view)
6389 {
6390 	const struct got_error *err;
6391 	struct tog_blame_view_state *s = &view->state.blame;
6392 
6393 	view->count = 0;
6394 	s->done = 1;
6395 	err = stop_blame(&s->blame);
6396 	s->done = 0;
6397 	if (err)
6398 		return err;
6399 	return run_blame(view);
6400 }
6401 
6402 static const struct got_error *
6403 cmd_blame(int argc, char *argv[])
6404 {
6405 	const struct got_error *error;
6406 	struct got_repository *repo = NULL;
6407 	struct got_worktree *worktree = NULL;
6408 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6409 	char *link_target = NULL;
6410 	struct got_object_id *commit_id = NULL;
6411 	struct got_commit_object *commit = NULL;
6412 	char *commit_id_str = NULL;
6413 	int ch;
6414 	struct tog_view *view;
6415 	int *pack_fds = NULL;
6416 
6417 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6418 		switch (ch) {
6419 		case 'c':
6420 			commit_id_str = optarg;
6421 			break;
6422 		case 'r':
6423 			repo_path = realpath(optarg, NULL);
6424 			if (repo_path == NULL)
6425 				return got_error_from_errno2("realpath",
6426 				    optarg);
6427 			break;
6428 		default:
6429 			usage_blame();
6430 			/* NOTREACHED */
6431 		}
6432 	}
6433 
6434 	argc -= optind;
6435 	argv += optind;
6436 
6437 	if (argc != 1)
6438 		usage_blame();
6439 
6440 	error = got_repo_pack_fds_open(&pack_fds);
6441 	if (error != NULL)
6442 		goto done;
6443 
6444 	if (repo_path == NULL) {
6445 		cwd = getcwd(NULL, 0);
6446 		if (cwd == NULL)
6447 			return got_error_from_errno("getcwd");
6448 		error = got_worktree_open(&worktree, cwd);
6449 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6450 			goto done;
6451 		if (worktree)
6452 			repo_path =
6453 			    strdup(got_worktree_get_repo_path(worktree));
6454 		else
6455 			repo_path = strdup(cwd);
6456 		if (repo_path == NULL) {
6457 			error = got_error_from_errno("strdup");
6458 			goto done;
6459 		}
6460 	}
6461 
6462 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6463 	if (error != NULL)
6464 		goto done;
6465 
6466 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6467 	    worktree);
6468 	if (error)
6469 		goto done;
6470 
6471 	init_curses();
6472 
6473 	error = apply_unveil(got_repo_get_path(repo), NULL);
6474 	if (error)
6475 		goto done;
6476 
6477 	error = tog_load_refs(repo, 0);
6478 	if (error)
6479 		goto done;
6480 
6481 	if (commit_id_str == NULL) {
6482 		struct got_reference *head_ref;
6483 		error = got_ref_open(&head_ref, repo, worktree ?
6484 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6485 		if (error != NULL)
6486 			goto done;
6487 		error = got_ref_resolve(&commit_id, repo, head_ref);
6488 		got_ref_close(head_ref);
6489 	} else {
6490 		error = got_repo_match_object_id(&commit_id, NULL,
6491 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6492 	}
6493 	if (error != NULL)
6494 		goto done;
6495 
6496 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6497 	if (view == NULL) {
6498 		error = got_error_from_errno("view_open");
6499 		goto done;
6500 	}
6501 
6502 	error = got_object_open_as_commit(&commit, repo, commit_id);
6503 	if (error)
6504 		goto done;
6505 
6506 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6507 	    commit, repo);
6508 	if (error)
6509 		goto done;
6510 
6511 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6512 	    commit_id, repo);
6513 	if (error)
6514 		goto done;
6515 	if (worktree) {
6516 		/* Release work tree lock. */
6517 		got_worktree_close(worktree);
6518 		worktree = NULL;
6519 	}
6520 	error = view_loop(view);
6521 done:
6522 	free(repo_path);
6523 	free(in_repo_path);
6524 	free(link_target);
6525 	free(cwd);
6526 	free(commit_id);
6527 	if (commit)
6528 		got_object_commit_close(commit);
6529 	if (worktree)
6530 		got_worktree_close(worktree);
6531 	if (repo) {
6532 		const struct got_error *close_err = got_repo_close(repo);
6533 		if (error == NULL)
6534 			error = close_err;
6535 	}
6536 	if (pack_fds) {
6537 		const struct got_error *pack_err =
6538 		    got_repo_pack_fds_close(pack_fds);
6539 		if (error == NULL)
6540 			error = pack_err;
6541 	}
6542 	tog_free_refs();
6543 	return error;
6544 }
6545 
6546 static const struct got_error *
6547 draw_tree_entries(struct tog_view *view, const char *parent_path)
6548 {
6549 	struct tog_tree_view_state *s = &view->state.tree;
6550 	const struct got_error *err = NULL;
6551 	struct got_tree_entry *te;
6552 	wchar_t *wline;
6553 	char *index = NULL;
6554 	struct tog_color *tc;
6555 	int width, n, nentries, i = 1;
6556 	int limit = view->nlines;
6557 
6558 	s->ndisplayed = 0;
6559 	if (view_is_hsplit_top(view))
6560 		--limit;  /* border */
6561 
6562 	werase(view->window);
6563 
6564 	if (limit == 0)
6565 		return NULL;
6566 
6567 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6568 	    0, 0);
6569 	if (err)
6570 		return err;
6571 	if (view_needs_focus_indication(view))
6572 		wstandout(view->window);
6573 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6574 	if (tc)
6575 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6576 	waddwstr(view->window, wline);
6577 	free(wline);
6578 	wline = NULL;
6579 	while (width++ < view->ncols)
6580 		waddch(view->window, ' ');
6581 	if (tc)
6582 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6583 	if (view_needs_focus_indication(view))
6584 		wstandend(view->window);
6585 	if (--limit <= 0)
6586 		return NULL;
6587 
6588 	i += s->selected;
6589 	if (s->first_displayed_entry) {
6590 		i += got_tree_entry_get_index(s->first_displayed_entry);
6591 		if (s->tree != s->root)
6592 			++i;  /* account for ".." entry */
6593 	}
6594 	nentries = got_object_tree_get_nentries(s->tree);
6595 	if (asprintf(&index, "[%d/%d] %s",
6596 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6597 		return got_error_from_errno("asprintf");
6598 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6599 	free(index);
6600 	if (err)
6601 		return err;
6602 	waddwstr(view->window, wline);
6603 	free(wline);
6604 	wline = NULL;
6605 	if (width < view->ncols - 1)
6606 		waddch(view->window, '\n');
6607 	if (--limit <= 0)
6608 		return NULL;
6609 	waddch(view->window, '\n');
6610 	if (--limit <= 0)
6611 		return NULL;
6612 
6613 	if (s->first_displayed_entry == NULL) {
6614 		te = got_object_tree_get_first_entry(s->tree);
6615 		if (s->selected == 0) {
6616 			if (view->focussed)
6617 				wstandout(view->window);
6618 			s->selected_entry = NULL;
6619 		}
6620 		waddstr(view->window, "  ..\n");	/* parent directory */
6621 		if (s->selected == 0 && view->focussed)
6622 			wstandend(view->window);
6623 		s->ndisplayed++;
6624 		if (--limit <= 0)
6625 			return NULL;
6626 		n = 1;
6627 	} else {
6628 		n = 0;
6629 		te = s->first_displayed_entry;
6630 	}
6631 
6632 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6633 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6634 		const char *modestr = "";
6635 		mode_t mode;
6636 
6637 		te = got_object_tree_get_entry(s->tree, i);
6638 		mode = got_tree_entry_get_mode(te);
6639 
6640 		if (s->show_ids) {
6641 			err = got_object_id_str(&id_str,
6642 			    got_tree_entry_get_id(te));
6643 			if (err)
6644 				return got_error_from_errno(
6645 				    "got_object_id_str");
6646 		}
6647 		if (got_object_tree_entry_is_submodule(te))
6648 			modestr = "$";
6649 		else if (S_ISLNK(mode)) {
6650 			int i;
6651 
6652 			err = got_tree_entry_get_symlink_target(&link_target,
6653 			    te, s->repo);
6654 			if (err) {
6655 				free(id_str);
6656 				return err;
6657 			}
6658 			for (i = 0; i < strlen(link_target); i++) {
6659 				if (!isprint((unsigned char)link_target[i]))
6660 					link_target[i] = '?';
6661 			}
6662 			modestr = "@";
6663 		}
6664 		else if (S_ISDIR(mode))
6665 			modestr = "/";
6666 		else if (mode & S_IXUSR)
6667 			modestr = "*";
6668 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6669 		    got_tree_entry_get_name(te), modestr,
6670 		    link_target ? " -> ": "",
6671 		    link_target ? link_target : "") == -1) {
6672 			free(id_str);
6673 			free(link_target);
6674 			return got_error_from_errno("asprintf");
6675 		}
6676 		free(id_str);
6677 		free(link_target);
6678 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6679 		    0, 0);
6680 		if (err) {
6681 			free(line);
6682 			break;
6683 		}
6684 		if (n == s->selected) {
6685 			if (view->focussed)
6686 				wstandout(view->window);
6687 			s->selected_entry = te;
6688 		}
6689 		tc = match_color(&s->colors, line);
6690 		if (tc)
6691 			wattr_on(view->window,
6692 			    COLOR_PAIR(tc->colorpair), NULL);
6693 		waddwstr(view->window, wline);
6694 		if (tc)
6695 			wattr_off(view->window,
6696 			    COLOR_PAIR(tc->colorpair), NULL);
6697 		if (width < view->ncols - 1)
6698 			waddch(view->window, '\n');
6699 		if (n == s->selected && view->focussed)
6700 			wstandend(view->window);
6701 		free(line);
6702 		free(wline);
6703 		wline = NULL;
6704 		n++;
6705 		s->ndisplayed++;
6706 		s->last_displayed_entry = te;
6707 		if (--limit <= 0)
6708 			break;
6709 	}
6710 
6711 	return err;
6712 }
6713 
6714 static void
6715 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6716 {
6717 	struct got_tree_entry *te;
6718 	int isroot = s->tree == s->root;
6719 	int i = 0;
6720 
6721 	if (s->first_displayed_entry == NULL)
6722 		return;
6723 
6724 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6725 	while (i++ < maxscroll) {
6726 		if (te == NULL) {
6727 			if (!isroot)
6728 				s->first_displayed_entry = NULL;
6729 			break;
6730 		}
6731 		s->first_displayed_entry = te;
6732 		te = got_tree_entry_get_prev(s->tree, te);
6733 	}
6734 }
6735 
6736 static const struct got_error *
6737 tree_scroll_down(struct tog_view *view, int maxscroll)
6738 {
6739 	struct tog_tree_view_state *s = &view->state.tree;
6740 	struct got_tree_entry *next, *last;
6741 	int n = 0;
6742 
6743 	if (s->first_displayed_entry)
6744 		next = got_tree_entry_get_next(s->tree,
6745 		    s->first_displayed_entry);
6746 	else
6747 		next = got_object_tree_get_first_entry(s->tree);
6748 
6749 	last = s->last_displayed_entry;
6750 	while (next && n++ < maxscroll) {
6751 		if (last) {
6752 			s->last_displayed_entry = last;
6753 			last = got_tree_entry_get_next(s->tree, last);
6754 		}
6755 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6756 			s->first_displayed_entry = next;
6757 			next = got_tree_entry_get_next(s->tree, next);
6758 		}
6759 	}
6760 
6761 	return NULL;
6762 }
6763 
6764 static const struct got_error *
6765 tree_entry_path(char **path, struct tog_parent_trees *parents,
6766     struct got_tree_entry *te)
6767 {
6768 	const struct got_error *err = NULL;
6769 	struct tog_parent_tree *pt;
6770 	size_t len = 2; /* for leading slash and NUL */
6771 
6772 	TAILQ_FOREACH(pt, parents, entry)
6773 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6774 		    + 1 /* slash */;
6775 	if (te)
6776 		len += strlen(got_tree_entry_get_name(te));
6777 
6778 	*path = calloc(1, len);
6779 	if (path == NULL)
6780 		return got_error_from_errno("calloc");
6781 
6782 	(*path)[0] = '/';
6783 	pt = TAILQ_LAST(parents, tog_parent_trees);
6784 	while (pt) {
6785 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6786 		if (strlcat(*path, name, len) >= len) {
6787 			err = got_error(GOT_ERR_NO_SPACE);
6788 			goto done;
6789 		}
6790 		if (strlcat(*path, "/", len) >= len) {
6791 			err = got_error(GOT_ERR_NO_SPACE);
6792 			goto done;
6793 		}
6794 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6795 	}
6796 	if (te) {
6797 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6798 			err = got_error(GOT_ERR_NO_SPACE);
6799 			goto done;
6800 		}
6801 	}
6802 done:
6803 	if (err) {
6804 		free(*path);
6805 		*path = NULL;
6806 	}
6807 	return err;
6808 }
6809 
6810 static const struct got_error *
6811 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6812     struct got_tree_entry *te, struct tog_parent_trees *parents,
6813     struct got_object_id *commit_id, struct got_repository *repo)
6814 {
6815 	const struct got_error *err = NULL;
6816 	char *path;
6817 	struct tog_view *blame_view;
6818 
6819 	*new_view = NULL;
6820 
6821 	err = tree_entry_path(&path, parents, te);
6822 	if (err)
6823 		return err;
6824 
6825 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6826 	if (blame_view == NULL) {
6827 		err = got_error_from_errno("view_open");
6828 		goto done;
6829 	}
6830 
6831 	err = open_blame_view(blame_view, path, commit_id, repo);
6832 	if (err) {
6833 		if (err->code == GOT_ERR_CANCELLED)
6834 			err = NULL;
6835 		view_close(blame_view);
6836 	} else
6837 		*new_view = blame_view;
6838 done:
6839 	free(path);
6840 	return err;
6841 }
6842 
6843 static const struct got_error *
6844 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6845     struct tog_tree_view_state *s)
6846 {
6847 	struct tog_view *log_view;
6848 	const struct got_error *err = NULL;
6849 	char *path;
6850 
6851 	*new_view = NULL;
6852 
6853 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6854 	if (log_view == NULL)
6855 		return got_error_from_errno("view_open");
6856 
6857 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6858 	if (err)
6859 		return err;
6860 
6861 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6862 	    path, 0);
6863 	if (err)
6864 		view_close(log_view);
6865 	else
6866 		*new_view = log_view;
6867 	free(path);
6868 	return err;
6869 }
6870 
6871 static const struct got_error *
6872 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6873     const char *head_ref_name, struct got_repository *repo)
6874 {
6875 	const struct got_error *err = NULL;
6876 	char *commit_id_str = NULL;
6877 	struct tog_tree_view_state *s = &view->state.tree;
6878 	struct got_commit_object *commit = NULL;
6879 
6880 	TAILQ_INIT(&s->parents);
6881 	STAILQ_INIT(&s->colors);
6882 
6883 	s->commit_id = got_object_id_dup(commit_id);
6884 	if (s->commit_id == NULL)
6885 		return got_error_from_errno("got_object_id_dup");
6886 
6887 	err = got_object_open_as_commit(&commit, repo, commit_id);
6888 	if (err)
6889 		goto done;
6890 
6891 	/*
6892 	 * The root is opened here and will be closed when the view is closed.
6893 	 * Any visited subtrees and their path-wise parents are opened and
6894 	 * closed on demand.
6895 	 */
6896 	err = got_object_open_as_tree(&s->root, repo,
6897 	    got_object_commit_get_tree_id(commit));
6898 	if (err)
6899 		goto done;
6900 	s->tree = s->root;
6901 
6902 	err = got_object_id_str(&commit_id_str, commit_id);
6903 	if (err != NULL)
6904 		goto done;
6905 
6906 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6907 		err = got_error_from_errno("asprintf");
6908 		goto done;
6909 	}
6910 
6911 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6912 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6913 	if (head_ref_name) {
6914 		s->head_ref_name = strdup(head_ref_name);
6915 		if (s->head_ref_name == NULL) {
6916 			err = got_error_from_errno("strdup");
6917 			goto done;
6918 		}
6919 	}
6920 	s->repo = repo;
6921 
6922 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6923 		err = add_color(&s->colors, "\\$$",
6924 		    TOG_COLOR_TREE_SUBMODULE,
6925 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6926 		if (err)
6927 			goto done;
6928 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6929 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6930 		if (err)
6931 			goto done;
6932 		err = add_color(&s->colors, "/$",
6933 		    TOG_COLOR_TREE_DIRECTORY,
6934 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6935 		if (err)
6936 			goto done;
6937 
6938 		err = add_color(&s->colors, "\\*$",
6939 		    TOG_COLOR_TREE_EXECUTABLE,
6940 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6941 		if (err)
6942 			goto done;
6943 
6944 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6945 		    get_color_value("TOG_COLOR_COMMIT"));
6946 		if (err)
6947 			goto done;
6948 	}
6949 
6950 	view->show = show_tree_view;
6951 	view->input = input_tree_view;
6952 	view->close = close_tree_view;
6953 	view->search_start = search_start_tree_view;
6954 	view->search_next = search_next_tree_view;
6955 done:
6956 	free(commit_id_str);
6957 	if (commit)
6958 		got_object_commit_close(commit);
6959 	if (err)
6960 		close_tree_view(view);
6961 	return err;
6962 }
6963 
6964 static const struct got_error *
6965 close_tree_view(struct tog_view *view)
6966 {
6967 	struct tog_tree_view_state *s = &view->state.tree;
6968 
6969 	free_colors(&s->colors);
6970 	free(s->tree_label);
6971 	s->tree_label = NULL;
6972 	free(s->commit_id);
6973 	s->commit_id = NULL;
6974 	free(s->head_ref_name);
6975 	s->head_ref_name = NULL;
6976 	while (!TAILQ_EMPTY(&s->parents)) {
6977 		struct tog_parent_tree *parent;
6978 		parent = TAILQ_FIRST(&s->parents);
6979 		TAILQ_REMOVE(&s->parents, parent, entry);
6980 		if (parent->tree != s->root)
6981 			got_object_tree_close(parent->tree);
6982 		free(parent);
6983 
6984 	}
6985 	if (s->tree != NULL && s->tree != s->root)
6986 		got_object_tree_close(s->tree);
6987 	if (s->root)
6988 		got_object_tree_close(s->root);
6989 	return NULL;
6990 }
6991 
6992 static const struct got_error *
6993 search_start_tree_view(struct tog_view *view)
6994 {
6995 	struct tog_tree_view_state *s = &view->state.tree;
6996 
6997 	s->matched_entry = NULL;
6998 	return NULL;
6999 }
7000 
7001 static int
7002 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7003 {
7004 	regmatch_t regmatch;
7005 
7006 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7007 	    0) == 0;
7008 }
7009 
7010 static const struct got_error *
7011 search_next_tree_view(struct tog_view *view)
7012 {
7013 	struct tog_tree_view_state *s = &view->state.tree;
7014 	struct got_tree_entry *te = NULL;
7015 
7016 	if (!view->searching) {
7017 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7018 		return NULL;
7019 	}
7020 
7021 	if (s->matched_entry) {
7022 		if (view->searching == TOG_SEARCH_FORWARD) {
7023 			if (s->selected_entry)
7024 				te = got_tree_entry_get_next(s->tree,
7025 				    s->selected_entry);
7026 			else
7027 				te = got_object_tree_get_first_entry(s->tree);
7028 		} else {
7029 			if (s->selected_entry == NULL)
7030 				te = got_object_tree_get_last_entry(s->tree);
7031 			else
7032 				te = got_tree_entry_get_prev(s->tree,
7033 				    s->selected_entry);
7034 		}
7035 	} else {
7036 		if (s->selected_entry)
7037 			te = s->selected_entry;
7038 		else if (view->searching == TOG_SEARCH_FORWARD)
7039 			te = got_object_tree_get_first_entry(s->tree);
7040 		else
7041 			te = got_object_tree_get_last_entry(s->tree);
7042 	}
7043 
7044 	while (1) {
7045 		if (te == NULL) {
7046 			if (s->matched_entry == NULL) {
7047 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7048 				return NULL;
7049 			}
7050 			if (view->searching == TOG_SEARCH_FORWARD)
7051 				te = got_object_tree_get_first_entry(s->tree);
7052 			else
7053 				te = got_object_tree_get_last_entry(s->tree);
7054 		}
7055 
7056 		if (match_tree_entry(te, &view->regex)) {
7057 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7058 			s->matched_entry = te;
7059 			break;
7060 		}
7061 
7062 		if (view->searching == TOG_SEARCH_FORWARD)
7063 			te = got_tree_entry_get_next(s->tree, te);
7064 		else
7065 			te = got_tree_entry_get_prev(s->tree, te);
7066 	}
7067 
7068 	if (s->matched_entry) {
7069 		s->first_displayed_entry = s->matched_entry;
7070 		s->selected = 0;
7071 	}
7072 
7073 	return NULL;
7074 }
7075 
7076 static const struct got_error *
7077 show_tree_view(struct tog_view *view)
7078 {
7079 	const struct got_error *err = NULL;
7080 	struct tog_tree_view_state *s = &view->state.tree;
7081 	char *parent_path;
7082 
7083 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7084 	if (err)
7085 		return err;
7086 
7087 	err = draw_tree_entries(view, parent_path);
7088 	free(parent_path);
7089 
7090 	view_border(view);
7091 	return err;
7092 }
7093 
7094 static const struct got_error *
7095 tree_goto_line(struct tog_view *view, int nlines)
7096 {
7097 	const struct got_error		 *err = NULL;
7098 	struct tog_tree_view_state	 *s = &view->state.tree;
7099 	struct got_tree_entry		**fte, **lte, **ste;
7100 	int				  g, last, first = 1, i = 1;
7101 	int				  root = s->tree == s->root;
7102 	int				  off = root ? 1 : 2;
7103 
7104 	g = view->gline;
7105 	view->gline = 0;
7106 
7107 	if (g == 0)
7108 		g = 1;
7109 	else if (g > got_object_tree_get_nentries(s->tree))
7110 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7111 
7112 	fte = &s->first_displayed_entry;
7113 	lte = &s->last_displayed_entry;
7114 	ste = &s->selected_entry;
7115 
7116 	if (*fte != NULL) {
7117 		first = got_tree_entry_get_index(*fte);
7118 		first += off;  /* account for ".." */
7119 	}
7120 	last = got_tree_entry_get_index(*lte);
7121 	last += off;
7122 
7123 	if (g >= first && g <= last && g - first < nlines) {
7124 		s->selected = g - first;
7125 		return NULL;	/* gline is on the current page */
7126 	}
7127 
7128 	if (*ste != NULL) {
7129 		i = got_tree_entry_get_index(*ste);
7130 		i += off;
7131 	}
7132 
7133 	if (i < g) {
7134 		err = tree_scroll_down(view, g - i);
7135 		if (err)
7136 			return err;
7137 		if (got_tree_entry_get_index(*lte) >=
7138 		    got_object_tree_get_nentries(s->tree) - 1 &&
7139 		    first + s->selected < g &&
7140 		    s->selected < s->ndisplayed - 1) {
7141 			first = got_tree_entry_get_index(*fte);
7142 			first += off;
7143 			s->selected = g - first;
7144 		}
7145 	} else if (i > g)
7146 		tree_scroll_up(s, i - g);
7147 
7148 	if (g < nlines &&
7149 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7150 		s->selected = g - 1;
7151 
7152 	return NULL;
7153 }
7154 
7155 static const struct got_error *
7156 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7157 {
7158 	const struct got_error *err = NULL;
7159 	struct tog_tree_view_state *s = &view->state.tree;
7160 	struct got_tree_entry *te;
7161 	int n, nscroll = view->nlines - 3;
7162 
7163 	if (view->gline)
7164 		return tree_goto_line(view, nscroll);
7165 
7166 	switch (ch) {
7167 	case 'i':
7168 		s->show_ids = !s->show_ids;
7169 		view->count = 0;
7170 		break;
7171 	case 'L':
7172 		view->count = 0;
7173 		if (!s->selected_entry)
7174 			break;
7175 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7176 		break;
7177 	case 'R':
7178 		view->count = 0;
7179 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7180 		break;
7181 	case 'g':
7182 	case KEY_HOME:
7183 		s->selected = 0;
7184 		view->count = 0;
7185 		if (s->tree == s->root)
7186 			s->first_displayed_entry =
7187 			    got_object_tree_get_first_entry(s->tree);
7188 		else
7189 			s->first_displayed_entry = NULL;
7190 		break;
7191 	case 'G':
7192 	case KEY_END: {
7193 		int eos = view->nlines - 3;
7194 
7195 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7196 			--eos;  /* border */
7197 		s->selected = 0;
7198 		view->count = 0;
7199 		te = got_object_tree_get_last_entry(s->tree);
7200 		for (n = 0; n < eos; n++) {
7201 			if (te == NULL) {
7202 				if (s->tree != s->root) {
7203 					s->first_displayed_entry = NULL;
7204 					n++;
7205 				}
7206 				break;
7207 			}
7208 			s->first_displayed_entry = te;
7209 			te = got_tree_entry_get_prev(s->tree, te);
7210 		}
7211 		if (n > 0)
7212 			s->selected = n - 1;
7213 		break;
7214 	}
7215 	case 'k':
7216 	case KEY_UP:
7217 	case CTRL('p'):
7218 		if (s->selected > 0) {
7219 			s->selected--;
7220 			break;
7221 		}
7222 		tree_scroll_up(s, 1);
7223 		if (s->selected_entry == NULL ||
7224 		    (s->tree == s->root && s->selected_entry ==
7225 		     got_object_tree_get_first_entry(s->tree)))
7226 			view->count = 0;
7227 		break;
7228 	case CTRL('u'):
7229 	case 'u':
7230 		nscroll /= 2;
7231 		/* FALL THROUGH */
7232 	case KEY_PPAGE:
7233 	case CTRL('b'):
7234 	case 'b':
7235 		if (s->tree == s->root) {
7236 			if (got_object_tree_get_first_entry(s->tree) ==
7237 			    s->first_displayed_entry)
7238 				s->selected -= MIN(s->selected, nscroll);
7239 		} else {
7240 			if (s->first_displayed_entry == NULL)
7241 				s->selected -= MIN(s->selected, nscroll);
7242 		}
7243 		tree_scroll_up(s, MAX(0, nscroll));
7244 		if (s->selected_entry == NULL ||
7245 		    (s->tree == s->root && s->selected_entry ==
7246 		     got_object_tree_get_first_entry(s->tree)))
7247 			view->count = 0;
7248 		break;
7249 	case 'j':
7250 	case KEY_DOWN:
7251 	case CTRL('n'):
7252 		if (s->selected < s->ndisplayed - 1) {
7253 			s->selected++;
7254 			break;
7255 		}
7256 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7257 		    == NULL) {
7258 			/* can't scroll any further */
7259 			view->count = 0;
7260 			break;
7261 		}
7262 		tree_scroll_down(view, 1);
7263 		break;
7264 	case CTRL('d'):
7265 	case 'd':
7266 		nscroll /= 2;
7267 		/* FALL THROUGH */
7268 	case KEY_NPAGE:
7269 	case CTRL('f'):
7270 	case 'f':
7271 	case ' ':
7272 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7273 		    == NULL) {
7274 			/* can't scroll any further; move cursor down */
7275 			if (s->selected < s->ndisplayed - 1)
7276 				s->selected += MIN(nscroll,
7277 				    s->ndisplayed - s->selected - 1);
7278 			else
7279 				view->count = 0;
7280 			break;
7281 		}
7282 		tree_scroll_down(view, nscroll);
7283 		break;
7284 	case KEY_ENTER:
7285 	case '\r':
7286 	case KEY_BACKSPACE:
7287 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7288 			struct tog_parent_tree *parent;
7289 			/* user selected '..' */
7290 			if (s->tree == s->root) {
7291 				view->count = 0;
7292 				break;
7293 			}
7294 			parent = TAILQ_FIRST(&s->parents);
7295 			TAILQ_REMOVE(&s->parents, parent,
7296 			    entry);
7297 			got_object_tree_close(s->tree);
7298 			s->tree = parent->tree;
7299 			s->first_displayed_entry =
7300 			    parent->first_displayed_entry;
7301 			s->selected_entry =
7302 			    parent->selected_entry;
7303 			s->selected = parent->selected;
7304 			if (s->selected > view->nlines - 3) {
7305 				err = offset_selection_down(view);
7306 				if (err)
7307 					break;
7308 			}
7309 			free(parent);
7310 		} else if (S_ISDIR(got_tree_entry_get_mode(
7311 		    s->selected_entry))) {
7312 			struct got_tree_object *subtree;
7313 			view->count = 0;
7314 			err = got_object_open_as_tree(&subtree, s->repo,
7315 			    got_tree_entry_get_id(s->selected_entry));
7316 			if (err)
7317 				break;
7318 			err = tree_view_visit_subtree(s, subtree);
7319 			if (err) {
7320 				got_object_tree_close(subtree);
7321 				break;
7322 			}
7323 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7324 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7325 		break;
7326 	case KEY_RESIZE:
7327 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7328 			s->selected = view->nlines - 4;
7329 		view->count = 0;
7330 		break;
7331 	default:
7332 		view->count = 0;
7333 		break;
7334 	}
7335 
7336 	return err;
7337 }
7338 
7339 __dead static void
7340 usage_tree(void)
7341 {
7342 	endwin();
7343 	fprintf(stderr,
7344 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7345 	    getprogname());
7346 	exit(1);
7347 }
7348 
7349 static const struct got_error *
7350 cmd_tree(int argc, char *argv[])
7351 {
7352 	const struct got_error *error;
7353 	struct got_repository *repo = NULL;
7354 	struct got_worktree *worktree = NULL;
7355 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7356 	struct got_object_id *commit_id = NULL;
7357 	struct got_commit_object *commit = NULL;
7358 	const char *commit_id_arg = NULL;
7359 	char *label = NULL;
7360 	struct got_reference *ref = NULL;
7361 	const char *head_ref_name = NULL;
7362 	int ch;
7363 	struct tog_view *view;
7364 	int *pack_fds = NULL;
7365 
7366 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7367 		switch (ch) {
7368 		case 'c':
7369 			commit_id_arg = optarg;
7370 			break;
7371 		case 'r':
7372 			repo_path = realpath(optarg, NULL);
7373 			if (repo_path == NULL)
7374 				return got_error_from_errno2("realpath",
7375 				    optarg);
7376 			break;
7377 		default:
7378 			usage_tree();
7379 			/* NOTREACHED */
7380 		}
7381 	}
7382 
7383 	argc -= optind;
7384 	argv += optind;
7385 
7386 	if (argc > 1)
7387 		usage_tree();
7388 
7389 	error = got_repo_pack_fds_open(&pack_fds);
7390 	if (error != NULL)
7391 		goto done;
7392 
7393 	if (repo_path == NULL) {
7394 		cwd = getcwd(NULL, 0);
7395 		if (cwd == NULL)
7396 			return got_error_from_errno("getcwd");
7397 		error = got_worktree_open(&worktree, cwd);
7398 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7399 			goto done;
7400 		if (worktree)
7401 			repo_path =
7402 			    strdup(got_worktree_get_repo_path(worktree));
7403 		else
7404 			repo_path = strdup(cwd);
7405 		if (repo_path == NULL) {
7406 			error = got_error_from_errno("strdup");
7407 			goto done;
7408 		}
7409 	}
7410 
7411 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7412 	if (error != NULL)
7413 		goto done;
7414 
7415 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7416 	    repo, worktree);
7417 	if (error)
7418 		goto done;
7419 
7420 	init_curses();
7421 
7422 	error = apply_unveil(got_repo_get_path(repo), NULL);
7423 	if (error)
7424 		goto done;
7425 
7426 	error = tog_load_refs(repo, 0);
7427 	if (error)
7428 		goto done;
7429 
7430 	if (commit_id_arg == NULL) {
7431 		error = got_repo_match_object_id(&commit_id, &label,
7432 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7433 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7434 		if (error)
7435 			goto done;
7436 		head_ref_name = label;
7437 	} else {
7438 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7439 		if (error == NULL)
7440 			head_ref_name = got_ref_get_name(ref);
7441 		else if (error->code != GOT_ERR_NOT_REF)
7442 			goto done;
7443 		error = got_repo_match_object_id(&commit_id, NULL,
7444 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7445 		if (error)
7446 			goto done;
7447 	}
7448 
7449 	error = got_object_open_as_commit(&commit, repo, commit_id);
7450 	if (error)
7451 		goto done;
7452 
7453 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7454 	if (view == NULL) {
7455 		error = got_error_from_errno("view_open");
7456 		goto done;
7457 	}
7458 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7459 	if (error)
7460 		goto done;
7461 	if (!got_path_is_root_dir(in_repo_path)) {
7462 		error = tree_view_walk_path(&view->state.tree, commit,
7463 		    in_repo_path);
7464 		if (error)
7465 			goto done;
7466 	}
7467 
7468 	if (worktree) {
7469 		/* Release work tree lock. */
7470 		got_worktree_close(worktree);
7471 		worktree = NULL;
7472 	}
7473 	error = view_loop(view);
7474 done:
7475 	free(repo_path);
7476 	free(cwd);
7477 	free(commit_id);
7478 	free(label);
7479 	if (ref)
7480 		got_ref_close(ref);
7481 	if (repo) {
7482 		const struct got_error *close_err = got_repo_close(repo);
7483 		if (error == NULL)
7484 			error = close_err;
7485 	}
7486 	if (pack_fds) {
7487 		const struct got_error *pack_err =
7488 		    got_repo_pack_fds_close(pack_fds);
7489 		if (error == NULL)
7490 			error = pack_err;
7491 	}
7492 	tog_free_refs();
7493 	return error;
7494 }
7495 
7496 static const struct got_error *
7497 ref_view_load_refs(struct tog_ref_view_state *s)
7498 {
7499 	struct got_reflist_entry *sre;
7500 	struct tog_reflist_entry *re;
7501 
7502 	s->nrefs = 0;
7503 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7504 		if (strncmp(got_ref_get_name(sre->ref),
7505 		    "refs/got/", 9) == 0 &&
7506 		    strncmp(got_ref_get_name(sre->ref),
7507 		    "refs/got/backup/", 16) != 0)
7508 			continue;
7509 
7510 		re = malloc(sizeof(*re));
7511 		if (re == NULL)
7512 			return got_error_from_errno("malloc");
7513 
7514 		re->ref = got_ref_dup(sre->ref);
7515 		if (re->ref == NULL)
7516 			return got_error_from_errno("got_ref_dup");
7517 		re->idx = s->nrefs++;
7518 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7519 	}
7520 
7521 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7522 	return NULL;
7523 }
7524 
7525 static void
7526 ref_view_free_refs(struct tog_ref_view_state *s)
7527 {
7528 	struct tog_reflist_entry *re;
7529 
7530 	while (!TAILQ_EMPTY(&s->refs)) {
7531 		re = TAILQ_FIRST(&s->refs);
7532 		TAILQ_REMOVE(&s->refs, re, entry);
7533 		got_ref_close(re->ref);
7534 		free(re);
7535 	}
7536 }
7537 
7538 static const struct got_error *
7539 open_ref_view(struct tog_view *view, struct got_repository *repo)
7540 {
7541 	const struct got_error *err = NULL;
7542 	struct tog_ref_view_state *s = &view->state.ref;
7543 
7544 	s->selected_entry = 0;
7545 	s->repo = repo;
7546 
7547 	TAILQ_INIT(&s->refs);
7548 	STAILQ_INIT(&s->colors);
7549 
7550 	err = ref_view_load_refs(s);
7551 	if (err)
7552 		return err;
7553 
7554 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7555 		err = add_color(&s->colors, "^refs/heads/",
7556 		    TOG_COLOR_REFS_HEADS,
7557 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7558 		if (err)
7559 			goto done;
7560 
7561 		err = add_color(&s->colors, "^refs/tags/",
7562 		    TOG_COLOR_REFS_TAGS,
7563 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7564 		if (err)
7565 			goto done;
7566 
7567 		err = add_color(&s->colors, "^refs/remotes/",
7568 		    TOG_COLOR_REFS_REMOTES,
7569 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7570 		if (err)
7571 			goto done;
7572 
7573 		err = add_color(&s->colors, "^refs/got/backup/",
7574 		    TOG_COLOR_REFS_BACKUP,
7575 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7576 		if (err)
7577 			goto done;
7578 	}
7579 
7580 	view->show = show_ref_view;
7581 	view->input = input_ref_view;
7582 	view->close = close_ref_view;
7583 	view->search_start = search_start_ref_view;
7584 	view->search_next = search_next_ref_view;
7585 done:
7586 	if (err)
7587 		free_colors(&s->colors);
7588 	return err;
7589 }
7590 
7591 static const struct got_error *
7592 close_ref_view(struct tog_view *view)
7593 {
7594 	struct tog_ref_view_state *s = &view->state.ref;
7595 
7596 	ref_view_free_refs(s);
7597 	free_colors(&s->colors);
7598 
7599 	return NULL;
7600 }
7601 
7602 static const struct got_error *
7603 resolve_reflist_entry(struct got_object_id **commit_id,
7604     struct tog_reflist_entry *re, struct got_repository *repo)
7605 {
7606 	const struct got_error *err = NULL;
7607 	struct got_object_id *obj_id;
7608 	struct got_tag_object *tag = NULL;
7609 	int obj_type;
7610 
7611 	*commit_id = NULL;
7612 
7613 	err = got_ref_resolve(&obj_id, repo, re->ref);
7614 	if (err)
7615 		return err;
7616 
7617 	err = got_object_get_type(&obj_type, repo, obj_id);
7618 	if (err)
7619 		goto done;
7620 
7621 	switch (obj_type) {
7622 	case GOT_OBJ_TYPE_COMMIT:
7623 		*commit_id = obj_id;
7624 		break;
7625 	case GOT_OBJ_TYPE_TAG:
7626 		err = got_object_open_as_tag(&tag, repo, obj_id);
7627 		if (err)
7628 			goto done;
7629 		free(obj_id);
7630 		err = got_object_get_type(&obj_type, repo,
7631 		    got_object_tag_get_object_id(tag));
7632 		if (err)
7633 			goto done;
7634 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7635 			err = got_error(GOT_ERR_OBJ_TYPE);
7636 			goto done;
7637 		}
7638 		*commit_id = got_object_id_dup(
7639 		    got_object_tag_get_object_id(tag));
7640 		if (*commit_id == NULL) {
7641 			err = got_error_from_errno("got_object_id_dup");
7642 			goto done;
7643 		}
7644 		break;
7645 	default:
7646 		err = got_error(GOT_ERR_OBJ_TYPE);
7647 		break;
7648 	}
7649 
7650 done:
7651 	if (tag)
7652 		got_object_tag_close(tag);
7653 	if (err) {
7654 		free(*commit_id);
7655 		*commit_id = NULL;
7656 	}
7657 	return err;
7658 }
7659 
7660 static const struct got_error *
7661 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7662     struct tog_reflist_entry *re, struct got_repository *repo)
7663 {
7664 	struct tog_view *log_view;
7665 	const struct got_error *err = NULL;
7666 	struct got_object_id *commit_id = NULL;
7667 
7668 	*new_view = NULL;
7669 
7670 	err = resolve_reflist_entry(&commit_id, re, repo);
7671 	if (err) {
7672 		if (err->code != GOT_ERR_OBJ_TYPE)
7673 			return err;
7674 		else
7675 			return NULL;
7676 	}
7677 
7678 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7679 	if (log_view == NULL) {
7680 		err = got_error_from_errno("view_open");
7681 		goto done;
7682 	}
7683 
7684 	err = open_log_view(log_view, commit_id, repo,
7685 	    got_ref_get_name(re->ref), "", 0);
7686 done:
7687 	if (err)
7688 		view_close(log_view);
7689 	else
7690 		*new_view = log_view;
7691 	free(commit_id);
7692 	return err;
7693 }
7694 
7695 static void
7696 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7697 {
7698 	struct tog_reflist_entry *re;
7699 	int i = 0;
7700 
7701 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7702 		return;
7703 
7704 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7705 	while (i++ < maxscroll) {
7706 		if (re == NULL)
7707 			break;
7708 		s->first_displayed_entry = re;
7709 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7710 	}
7711 }
7712 
7713 static const struct got_error *
7714 ref_scroll_down(struct tog_view *view, int maxscroll)
7715 {
7716 	struct tog_ref_view_state *s = &view->state.ref;
7717 	struct tog_reflist_entry *next, *last;
7718 	int n = 0;
7719 
7720 	if (s->first_displayed_entry)
7721 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7722 	else
7723 		next = TAILQ_FIRST(&s->refs);
7724 
7725 	last = s->last_displayed_entry;
7726 	while (next && n++ < maxscroll) {
7727 		if (last) {
7728 			s->last_displayed_entry = last;
7729 			last = TAILQ_NEXT(last, entry);
7730 		}
7731 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7732 			s->first_displayed_entry = next;
7733 			next = TAILQ_NEXT(next, entry);
7734 		}
7735 	}
7736 
7737 	return NULL;
7738 }
7739 
7740 static const struct got_error *
7741 search_start_ref_view(struct tog_view *view)
7742 {
7743 	struct tog_ref_view_state *s = &view->state.ref;
7744 
7745 	s->matched_entry = NULL;
7746 	return NULL;
7747 }
7748 
7749 static int
7750 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7751 {
7752 	regmatch_t regmatch;
7753 
7754 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7755 	    0) == 0;
7756 }
7757 
7758 static const struct got_error *
7759 search_next_ref_view(struct tog_view *view)
7760 {
7761 	struct tog_ref_view_state *s = &view->state.ref;
7762 	struct tog_reflist_entry *re = NULL;
7763 
7764 	if (!view->searching) {
7765 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7766 		return NULL;
7767 	}
7768 
7769 	if (s->matched_entry) {
7770 		if (view->searching == TOG_SEARCH_FORWARD) {
7771 			if (s->selected_entry)
7772 				re = TAILQ_NEXT(s->selected_entry, entry);
7773 			else
7774 				re = TAILQ_PREV(s->selected_entry,
7775 				    tog_reflist_head, entry);
7776 		} else {
7777 			if (s->selected_entry == NULL)
7778 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7779 			else
7780 				re = TAILQ_PREV(s->selected_entry,
7781 				    tog_reflist_head, entry);
7782 		}
7783 	} else {
7784 		if (s->selected_entry)
7785 			re = s->selected_entry;
7786 		else if (view->searching == TOG_SEARCH_FORWARD)
7787 			re = TAILQ_FIRST(&s->refs);
7788 		else
7789 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7790 	}
7791 
7792 	while (1) {
7793 		if (re == NULL) {
7794 			if (s->matched_entry == NULL) {
7795 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7796 				return NULL;
7797 			}
7798 			if (view->searching == TOG_SEARCH_FORWARD)
7799 				re = TAILQ_FIRST(&s->refs);
7800 			else
7801 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7802 		}
7803 
7804 		if (match_reflist_entry(re, &view->regex)) {
7805 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7806 			s->matched_entry = re;
7807 			break;
7808 		}
7809 
7810 		if (view->searching == TOG_SEARCH_FORWARD)
7811 			re = TAILQ_NEXT(re, entry);
7812 		else
7813 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7814 	}
7815 
7816 	if (s->matched_entry) {
7817 		s->first_displayed_entry = s->matched_entry;
7818 		s->selected = 0;
7819 	}
7820 
7821 	return NULL;
7822 }
7823 
7824 static const struct got_error *
7825 show_ref_view(struct tog_view *view)
7826 {
7827 	const struct got_error *err = NULL;
7828 	struct tog_ref_view_state *s = &view->state.ref;
7829 	struct tog_reflist_entry *re;
7830 	char *line = NULL;
7831 	wchar_t *wline;
7832 	struct tog_color *tc;
7833 	int width, n;
7834 	int limit = view->nlines;
7835 
7836 	werase(view->window);
7837 
7838 	s->ndisplayed = 0;
7839 	if (view_is_hsplit_top(view))
7840 		--limit;  /* border */
7841 
7842 	if (limit == 0)
7843 		return NULL;
7844 
7845 	re = s->first_displayed_entry;
7846 
7847 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7848 	    s->nrefs) == -1)
7849 		return got_error_from_errno("asprintf");
7850 
7851 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7852 	if (err) {
7853 		free(line);
7854 		return err;
7855 	}
7856 	if (view_needs_focus_indication(view))
7857 		wstandout(view->window);
7858 	waddwstr(view->window, wline);
7859 	while (width++ < view->ncols)
7860 		waddch(view->window, ' ');
7861 	if (view_needs_focus_indication(view))
7862 		wstandend(view->window);
7863 	free(wline);
7864 	wline = NULL;
7865 	free(line);
7866 	line = NULL;
7867 	if (--limit <= 0)
7868 		return NULL;
7869 
7870 	n = 0;
7871 	while (re && limit > 0) {
7872 		char *line = NULL;
7873 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7874 
7875 		if (s->show_date) {
7876 			struct got_commit_object *ci;
7877 			struct got_tag_object *tag;
7878 			struct got_object_id *id;
7879 			struct tm tm;
7880 			time_t t;
7881 
7882 			err = got_ref_resolve(&id, s->repo, re->ref);
7883 			if (err)
7884 				return err;
7885 			err = got_object_open_as_tag(&tag, s->repo, id);
7886 			if (err) {
7887 				if (err->code != GOT_ERR_OBJ_TYPE) {
7888 					free(id);
7889 					return err;
7890 				}
7891 				err = got_object_open_as_commit(&ci, s->repo,
7892 				    id);
7893 				if (err) {
7894 					free(id);
7895 					return err;
7896 				}
7897 				t = got_object_commit_get_committer_time(ci);
7898 				got_object_commit_close(ci);
7899 			} else {
7900 				t = got_object_tag_get_tagger_time(tag);
7901 				got_object_tag_close(tag);
7902 			}
7903 			free(id);
7904 			if (gmtime_r(&t, &tm) == NULL)
7905 				return got_error_from_errno("gmtime_r");
7906 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7907 				return got_error(GOT_ERR_NO_SPACE);
7908 		}
7909 		if (got_ref_is_symbolic(re->ref)) {
7910 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7911 			    ymd : "", got_ref_get_name(re->ref),
7912 			    got_ref_get_symref_target(re->ref)) == -1)
7913 				return got_error_from_errno("asprintf");
7914 		} else if (s->show_ids) {
7915 			struct got_object_id *id;
7916 			char *id_str;
7917 			err = got_ref_resolve(&id, s->repo, re->ref);
7918 			if (err)
7919 				return err;
7920 			err = got_object_id_str(&id_str, id);
7921 			if (err) {
7922 				free(id);
7923 				return err;
7924 			}
7925 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7926 			    got_ref_get_name(re->ref), id_str) == -1) {
7927 				err = got_error_from_errno("asprintf");
7928 				free(id);
7929 				free(id_str);
7930 				return err;
7931 			}
7932 			free(id);
7933 			free(id_str);
7934 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7935 		    got_ref_get_name(re->ref)) == -1)
7936 			return got_error_from_errno("asprintf");
7937 
7938 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7939 		    0, 0);
7940 		if (err) {
7941 			free(line);
7942 			return err;
7943 		}
7944 		if (n == s->selected) {
7945 			if (view->focussed)
7946 				wstandout(view->window);
7947 			s->selected_entry = re;
7948 		}
7949 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7950 		if (tc)
7951 			wattr_on(view->window,
7952 			    COLOR_PAIR(tc->colorpair), NULL);
7953 		waddwstr(view->window, wline);
7954 		if (tc)
7955 			wattr_off(view->window,
7956 			    COLOR_PAIR(tc->colorpair), NULL);
7957 		if (width < view->ncols - 1)
7958 			waddch(view->window, '\n');
7959 		if (n == s->selected && view->focussed)
7960 			wstandend(view->window);
7961 		free(line);
7962 		free(wline);
7963 		wline = NULL;
7964 		n++;
7965 		s->ndisplayed++;
7966 		s->last_displayed_entry = re;
7967 
7968 		limit--;
7969 		re = TAILQ_NEXT(re, entry);
7970 	}
7971 
7972 	view_border(view);
7973 	return err;
7974 }
7975 
7976 static const struct got_error *
7977 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7978     struct tog_reflist_entry *re, struct got_repository *repo)
7979 {
7980 	const struct got_error *err = NULL;
7981 	struct got_object_id *commit_id = NULL;
7982 	struct tog_view *tree_view;
7983 
7984 	*new_view = NULL;
7985 
7986 	err = resolve_reflist_entry(&commit_id, re, repo);
7987 	if (err) {
7988 		if (err->code != GOT_ERR_OBJ_TYPE)
7989 			return err;
7990 		else
7991 			return NULL;
7992 	}
7993 
7994 
7995 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7996 	if (tree_view == NULL) {
7997 		err = got_error_from_errno("view_open");
7998 		goto done;
7999 	}
8000 
8001 	err = open_tree_view(tree_view, commit_id,
8002 	    got_ref_get_name(re->ref), repo);
8003 	if (err)
8004 		goto done;
8005 
8006 	*new_view = tree_view;
8007 done:
8008 	free(commit_id);
8009 	return err;
8010 }
8011 
8012 static const struct got_error *
8013 ref_goto_line(struct tog_view *view, int nlines)
8014 {
8015 	const struct got_error		*err = NULL;
8016 	struct tog_ref_view_state	*s = &view->state.ref;
8017 	int				 g, idx = s->selected_entry->idx;
8018 
8019 	g = view->gline;
8020 	view->gline = 0;
8021 
8022 	if (g == 0)
8023 		g = 1;
8024 	else if (g > s->nrefs)
8025 		g = s->nrefs;
8026 
8027 	if (g >= s->first_displayed_entry->idx + 1 &&
8028 	    g <= s->last_displayed_entry->idx + 1 &&
8029 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8030 		s->selected = g - s->first_displayed_entry->idx - 1;
8031 		return NULL;
8032 	}
8033 
8034 	if (idx + 1 < g) {
8035 		err = ref_scroll_down(view, g - idx - 1);
8036 		if (err)
8037 			return err;
8038 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8039 		    s->first_displayed_entry->idx + s->selected < g &&
8040 		    s->selected < s->ndisplayed - 1)
8041 			s->selected = g - s->first_displayed_entry->idx - 1;
8042 	} else if (idx + 1 > g)
8043 		ref_scroll_up(s, idx - g + 1);
8044 
8045 	if (g < nlines && s->first_displayed_entry->idx == 0)
8046 		s->selected = g - 1;
8047 
8048 	return NULL;
8049 
8050 }
8051 
8052 static const struct got_error *
8053 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8054 {
8055 	const struct got_error *err = NULL;
8056 	struct tog_ref_view_state *s = &view->state.ref;
8057 	struct tog_reflist_entry *re;
8058 	int n, nscroll = view->nlines - 1;
8059 
8060 	if (view->gline)
8061 		return ref_goto_line(view, nscroll);
8062 
8063 	switch (ch) {
8064 	case 'i':
8065 		s->show_ids = !s->show_ids;
8066 		view->count = 0;
8067 		break;
8068 	case 'm':
8069 		s->show_date = !s->show_date;
8070 		view->count = 0;
8071 		break;
8072 	case 'o':
8073 		s->sort_by_date = !s->sort_by_date;
8074 		view->count = 0;
8075 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8076 		    got_ref_cmp_by_commit_timestamp_descending :
8077 		    tog_ref_cmp_by_name, s->repo);
8078 		if (err)
8079 			break;
8080 		got_reflist_object_id_map_free(tog_refs_idmap);
8081 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8082 		    &tog_refs, s->repo);
8083 		if (err)
8084 			break;
8085 		ref_view_free_refs(s);
8086 		err = ref_view_load_refs(s);
8087 		break;
8088 	case KEY_ENTER:
8089 	case '\r':
8090 		view->count = 0;
8091 		if (!s->selected_entry)
8092 			break;
8093 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8094 		break;
8095 	case 'T':
8096 		view->count = 0;
8097 		if (!s->selected_entry)
8098 			break;
8099 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8100 		break;
8101 	case 'g':
8102 	case KEY_HOME:
8103 		s->selected = 0;
8104 		view->count = 0;
8105 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8106 		break;
8107 	case 'G':
8108 	case KEY_END: {
8109 		int eos = view->nlines - 1;
8110 
8111 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8112 			--eos;  /* border */
8113 		s->selected = 0;
8114 		view->count = 0;
8115 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8116 		for (n = 0; n < eos; n++) {
8117 			if (re == NULL)
8118 				break;
8119 			s->first_displayed_entry = re;
8120 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8121 		}
8122 		if (n > 0)
8123 			s->selected = n - 1;
8124 		break;
8125 	}
8126 	case 'k':
8127 	case KEY_UP:
8128 	case CTRL('p'):
8129 		if (s->selected > 0) {
8130 			s->selected--;
8131 			break;
8132 		}
8133 		ref_scroll_up(s, 1);
8134 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8135 			view->count = 0;
8136 		break;
8137 	case CTRL('u'):
8138 	case 'u':
8139 		nscroll /= 2;
8140 		/* FALL THROUGH */
8141 	case KEY_PPAGE:
8142 	case CTRL('b'):
8143 	case 'b':
8144 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8145 			s->selected -= MIN(nscroll, s->selected);
8146 		ref_scroll_up(s, MAX(0, nscroll));
8147 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8148 			view->count = 0;
8149 		break;
8150 	case 'j':
8151 	case KEY_DOWN:
8152 	case CTRL('n'):
8153 		if (s->selected < s->ndisplayed - 1) {
8154 			s->selected++;
8155 			break;
8156 		}
8157 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8158 			/* can't scroll any further */
8159 			view->count = 0;
8160 			break;
8161 		}
8162 		ref_scroll_down(view, 1);
8163 		break;
8164 	case CTRL('d'):
8165 	case 'd':
8166 		nscroll /= 2;
8167 		/* FALL THROUGH */
8168 	case KEY_NPAGE:
8169 	case CTRL('f'):
8170 	case 'f':
8171 	case ' ':
8172 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8173 			/* can't scroll any further; move cursor down */
8174 			if (s->selected < s->ndisplayed - 1)
8175 				s->selected += MIN(nscroll,
8176 				    s->ndisplayed - s->selected - 1);
8177 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8178 				s->selected += s->ndisplayed - s->selected - 1;
8179 			view->count = 0;
8180 			break;
8181 		}
8182 		ref_scroll_down(view, nscroll);
8183 		break;
8184 	case CTRL('l'):
8185 		view->count = 0;
8186 		tog_free_refs();
8187 		err = tog_load_refs(s->repo, s->sort_by_date);
8188 		if (err)
8189 			break;
8190 		ref_view_free_refs(s);
8191 		err = ref_view_load_refs(s);
8192 		break;
8193 	case KEY_RESIZE:
8194 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8195 			s->selected = view->nlines - 2;
8196 		break;
8197 	default:
8198 		view->count = 0;
8199 		break;
8200 	}
8201 
8202 	return err;
8203 }
8204 
8205 __dead static void
8206 usage_ref(void)
8207 {
8208 	endwin();
8209 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8210 	    getprogname());
8211 	exit(1);
8212 }
8213 
8214 static const struct got_error *
8215 cmd_ref(int argc, char *argv[])
8216 {
8217 	const struct got_error *error;
8218 	struct got_repository *repo = NULL;
8219 	struct got_worktree *worktree = NULL;
8220 	char *cwd = NULL, *repo_path = NULL;
8221 	int ch;
8222 	struct tog_view *view;
8223 	int *pack_fds = NULL;
8224 
8225 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8226 		switch (ch) {
8227 		case 'r':
8228 			repo_path = realpath(optarg, NULL);
8229 			if (repo_path == NULL)
8230 				return got_error_from_errno2("realpath",
8231 				    optarg);
8232 			break;
8233 		default:
8234 			usage_ref();
8235 			/* NOTREACHED */
8236 		}
8237 	}
8238 
8239 	argc -= optind;
8240 	argv += optind;
8241 
8242 	if (argc > 1)
8243 		usage_ref();
8244 
8245 	error = got_repo_pack_fds_open(&pack_fds);
8246 	if (error != NULL)
8247 		goto done;
8248 
8249 	if (repo_path == NULL) {
8250 		cwd = getcwd(NULL, 0);
8251 		if (cwd == NULL)
8252 			return got_error_from_errno("getcwd");
8253 		error = got_worktree_open(&worktree, cwd);
8254 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8255 			goto done;
8256 		if (worktree)
8257 			repo_path =
8258 			    strdup(got_worktree_get_repo_path(worktree));
8259 		else
8260 			repo_path = strdup(cwd);
8261 		if (repo_path == NULL) {
8262 			error = got_error_from_errno("strdup");
8263 			goto done;
8264 		}
8265 	}
8266 
8267 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8268 	if (error != NULL)
8269 		goto done;
8270 
8271 	init_curses();
8272 
8273 	error = apply_unveil(got_repo_get_path(repo), NULL);
8274 	if (error)
8275 		goto done;
8276 
8277 	error = tog_load_refs(repo, 0);
8278 	if (error)
8279 		goto done;
8280 
8281 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8282 	if (view == NULL) {
8283 		error = got_error_from_errno("view_open");
8284 		goto done;
8285 	}
8286 
8287 	error = open_ref_view(view, repo);
8288 	if (error)
8289 		goto done;
8290 
8291 	if (worktree) {
8292 		/* Release work tree lock. */
8293 		got_worktree_close(worktree);
8294 		worktree = NULL;
8295 	}
8296 	error = view_loop(view);
8297 done:
8298 	free(repo_path);
8299 	free(cwd);
8300 	if (repo) {
8301 		const struct got_error *close_err = got_repo_close(repo);
8302 		if (close_err)
8303 			error = close_err;
8304 	}
8305 	if (pack_fds) {
8306 		const struct got_error *pack_err =
8307 		    got_repo_pack_fds_close(pack_fds);
8308 		if (error == NULL)
8309 			error = pack_err;
8310 	}
8311 	tog_free_refs();
8312 	return error;
8313 }
8314 
8315 static const struct got_error *
8316 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8317     enum tog_view_type request, int y, int x)
8318 {
8319 	const struct got_error *err = NULL;
8320 
8321 	*new_view = NULL;
8322 
8323 	switch (request) {
8324 	case TOG_VIEW_DIFF:
8325 		if (view->type == TOG_VIEW_LOG) {
8326 			struct tog_log_view_state *s = &view->state.log;
8327 
8328 			err = open_diff_view_for_commit(new_view, y, x,
8329 			    s->selected_entry->commit, s->selected_entry->id,
8330 			    view, s->repo);
8331 		} else
8332 			return got_error_msg(GOT_ERR_NOT_IMPL,
8333 			    "parent/child view pair not supported");
8334 		break;
8335 	case TOG_VIEW_BLAME:
8336 		if (view->type == TOG_VIEW_TREE) {
8337 			struct tog_tree_view_state *s = &view->state.tree;
8338 
8339 			err = blame_tree_entry(new_view, y, x,
8340 			    s->selected_entry, &s->parents, s->commit_id,
8341 			    s->repo);
8342 		} else
8343 			return got_error_msg(GOT_ERR_NOT_IMPL,
8344 			    "parent/child view pair not supported");
8345 		break;
8346 	case TOG_VIEW_LOG:
8347 		if (view->type == TOG_VIEW_BLAME)
8348 			err = log_annotated_line(new_view, y, x,
8349 			    view->state.blame.repo, view->state.blame.id_to_log);
8350 		else if (view->type == TOG_VIEW_TREE)
8351 			err = log_selected_tree_entry(new_view, y, x,
8352 			    &view->state.tree);
8353 		else if (view->type == TOG_VIEW_REF)
8354 			err = log_ref_entry(new_view, y, x,
8355 			    view->state.ref.selected_entry,
8356 			    view->state.ref.repo);
8357 		else
8358 			return got_error_msg(GOT_ERR_NOT_IMPL,
8359 			    "parent/child view pair not supported");
8360 		break;
8361 	case TOG_VIEW_TREE:
8362 		if (view->type == TOG_VIEW_LOG)
8363 			err = browse_commit_tree(new_view, y, x,
8364 			    view->state.log.selected_entry,
8365 			    view->state.log.in_repo_path,
8366 			    view->state.log.head_ref_name,
8367 			    view->state.log.repo);
8368 		else if (view->type == TOG_VIEW_REF)
8369 			err = browse_ref_tree(new_view, y, x,
8370 			    view->state.ref.selected_entry,
8371 			    view->state.ref.repo);
8372 		else
8373 			return got_error_msg(GOT_ERR_NOT_IMPL,
8374 			    "parent/child view pair not supported");
8375 		break;
8376 	case TOG_VIEW_REF:
8377 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8378 		if (*new_view == NULL)
8379 			return got_error_from_errno("view_open");
8380 		if (view->type == TOG_VIEW_LOG)
8381 			err = open_ref_view(*new_view, view->state.log.repo);
8382 		else if (view->type == TOG_VIEW_TREE)
8383 			err = open_ref_view(*new_view, view->state.tree.repo);
8384 		else
8385 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8386 			    "parent/child view pair not supported");
8387 		if (err)
8388 			view_close(*new_view);
8389 		break;
8390 	default:
8391 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8392 	}
8393 
8394 	return err;
8395 }
8396 
8397 /*
8398  * If view was scrolled down to move the selected line into view when opening a
8399  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8400  */
8401 static void
8402 offset_selection_up(struct tog_view *view)
8403 {
8404 	switch (view->type) {
8405 	case TOG_VIEW_BLAME: {
8406 		struct tog_blame_view_state *s = &view->state.blame;
8407 		if (s->first_displayed_line == 1) {
8408 			s->selected_line = MAX(s->selected_line - view->offset,
8409 			    1);
8410 			break;
8411 		}
8412 		if (s->first_displayed_line > view->offset)
8413 			s->first_displayed_line -= view->offset;
8414 		else
8415 			s->first_displayed_line = 1;
8416 		s->selected_line += view->offset;
8417 		break;
8418 	}
8419 	case TOG_VIEW_LOG:
8420 		log_scroll_up(&view->state.log, view->offset);
8421 		view->state.log.selected += view->offset;
8422 		break;
8423 	case TOG_VIEW_REF:
8424 		ref_scroll_up(&view->state.ref, view->offset);
8425 		view->state.ref.selected += view->offset;
8426 		break;
8427 	case TOG_VIEW_TREE:
8428 		tree_scroll_up(&view->state.tree, view->offset);
8429 		view->state.tree.selected += view->offset;
8430 		break;
8431 	default:
8432 		break;
8433 	}
8434 
8435 	view->offset = 0;
8436 }
8437 
8438 /*
8439  * If the selected line is in the section of screen covered by the bottom split,
8440  * scroll down offset lines to move it into view and index its new position.
8441  */
8442 static const struct got_error *
8443 offset_selection_down(struct tog_view *view)
8444 {
8445 	const struct got_error	*err = NULL;
8446 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8447 	int			*selected = NULL;
8448 	int			 header, offset;
8449 
8450 	switch (view->type) {
8451 	case TOG_VIEW_BLAME: {
8452 		struct tog_blame_view_state *s = &view->state.blame;
8453 		header = 3;
8454 		scrolld = NULL;
8455 		if (s->selected_line > view->nlines - header) {
8456 			offset = abs(view->nlines - s->selected_line - header);
8457 			s->first_displayed_line += offset;
8458 			s->selected_line -= offset;
8459 			view->offset = offset;
8460 		}
8461 		break;
8462 	}
8463 	case TOG_VIEW_LOG: {
8464 		struct tog_log_view_state *s = &view->state.log;
8465 		scrolld = &log_scroll_down;
8466 		header = view_is_parent_view(view) ? 3 : 2;
8467 		selected = &s->selected;
8468 		break;
8469 	}
8470 	case TOG_VIEW_REF: {
8471 		struct tog_ref_view_state *s = &view->state.ref;
8472 		scrolld = &ref_scroll_down;
8473 		header = 3;
8474 		selected = &s->selected;
8475 		break;
8476 	}
8477 	case TOG_VIEW_TREE: {
8478 		struct tog_tree_view_state *s = &view->state.tree;
8479 		scrolld = &tree_scroll_down;
8480 		header = 5;
8481 		selected = &s->selected;
8482 		break;
8483 	}
8484 	default:
8485 		selected = NULL;
8486 		scrolld = NULL;
8487 		header = 0;
8488 		break;
8489 	}
8490 
8491 	if (selected && *selected > view->nlines - header) {
8492 		offset = abs(view->nlines - *selected - header);
8493 		view->offset = offset;
8494 		if (scrolld && offset) {
8495 			err = scrolld(view, offset);
8496 			*selected -= offset;
8497 		}
8498 	}
8499 
8500 	return err;
8501 }
8502 
8503 static void
8504 list_commands(FILE *fp)
8505 {
8506 	size_t i;
8507 
8508 	fprintf(fp, "commands:");
8509 	for (i = 0; i < nitems(tog_commands); i++) {
8510 		const struct tog_cmd *cmd = &tog_commands[i];
8511 		fprintf(fp, " %s", cmd->name);
8512 	}
8513 	fputc('\n', fp);
8514 }
8515 
8516 __dead static void
8517 usage(int hflag, int status)
8518 {
8519 	FILE *fp = (status == 0) ? stdout : stderr;
8520 
8521 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8522 	    getprogname());
8523 	if (hflag) {
8524 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8525 		list_commands(fp);
8526 	}
8527 	exit(status);
8528 }
8529 
8530 static char **
8531 make_argv(int argc, ...)
8532 {
8533 	va_list ap;
8534 	char **argv;
8535 	int i;
8536 
8537 	va_start(ap, argc);
8538 
8539 	argv = calloc(argc, sizeof(char *));
8540 	if (argv == NULL)
8541 		err(1, "calloc");
8542 	for (i = 0; i < argc; i++) {
8543 		argv[i] = strdup(va_arg(ap, char *));
8544 		if (argv[i] == NULL)
8545 			err(1, "strdup");
8546 	}
8547 
8548 	va_end(ap);
8549 	return argv;
8550 }
8551 
8552 /*
8553  * Try to convert 'tog path' into a 'tog log path' command.
8554  * The user could simply have mistyped the command rather than knowingly
8555  * provided a path. So check whether argv[0] can in fact be resolved
8556  * to a path in the HEAD commit and print a special error if not.
8557  * This hack is for mpi@ <3
8558  */
8559 static const struct got_error *
8560 tog_log_with_path(int argc, char *argv[])
8561 {
8562 	const struct got_error *error = NULL, *close_err;
8563 	const struct tog_cmd *cmd = NULL;
8564 	struct got_repository *repo = NULL;
8565 	struct got_worktree *worktree = NULL;
8566 	struct got_object_id *commit_id = NULL, *id = NULL;
8567 	struct got_commit_object *commit = NULL;
8568 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8569 	char *commit_id_str = NULL, **cmd_argv = NULL;
8570 	int *pack_fds = NULL;
8571 
8572 	cwd = getcwd(NULL, 0);
8573 	if (cwd == NULL)
8574 		return got_error_from_errno("getcwd");
8575 
8576 	error = got_repo_pack_fds_open(&pack_fds);
8577 	if (error != NULL)
8578 		goto done;
8579 
8580 	error = got_worktree_open(&worktree, cwd);
8581 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8582 		goto done;
8583 
8584 	if (worktree)
8585 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8586 	else
8587 		repo_path = strdup(cwd);
8588 	if (repo_path == NULL) {
8589 		error = got_error_from_errno("strdup");
8590 		goto done;
8591 	}
8592 
8593 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8594 	if (error != NULL)
8595 		goto done;
8596 
8597 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8598 	    repo, worktree);
8599 	if (error)
8600 		goto done;
8601 
8602 	error = tog_load_refs(repo, 0);
8603 	if (error)
8604 		goto done;
8605 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8606 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8607 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8608 	if (error)
8609 		goto done;
8610 
8611 	if (worktree) {
8612 		got_worktree_close(worktree);
8613 		worktree = NULL;
8614 	}
8615 
8616 	error = got_object_open_as_commit(&commit, repo, commit_id);
8617 	if (error)
8618 		goto done;
8619 
8620 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8621 	if (error) {
8622 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8623 			goto done;
8624 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8625 		    getprogname(), argv[0]);
8626 		usage(1, 1);
8627 		/* not reached */
8628 	}
8629 
8630 	error = got_object_id_str(&commit_id_str, commit_id);
8631 	if (error)
8632 		goto done;
8633 
8634 	cmd = &tog_commands[0]; /* log */
8635 	argc = 4;
8636 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8637 	error = cmd->cmd_main(argc, cmd_argv);
8638 done:
8639 	if (repo) {
8640 		close_err = got_repo_close(repo);
8641 		if (error == NULL)
8642 			error = close_err;
8643 	}
8644 	if (commit)
8645 		got_object_commit_close(commit);
8646 	if (worktree)
8647 		got_worktree_close(worktree);
8648 	if (pack_fds) {
8649 		const struct got_error *pack_err =
8650 		    got_repo_pack_fds_close(pack_fds);
8651 		if (error == NULL)
8652 			error = pack_err;
8653 	}
8654 	free(id);
8655 	free(commit_id_str);
8656 	free(commit_id);
8657 	free(cwd);
8658 	free(repo_path);
8659 	free(in_repo_path);
8660 	if (cmd_argv) {
8661 		int i;
8662 		for (i = 0; i < argc; i++)
8663 			free(cmd_argv[i]);
8664 		free(cmd_argv);
8665 	}
8666 	tog_free_refs();
8667 	return error;
8668 }
8669 
8670 int
8671 main(int argc, char *argv[])
8672 {
8673 	const struct got_error *error = NULL;
8674 	const struct tog_cmd *cmd = NULL;
8675 	int ch, hflag = 0, Vflag = 0;
8676 	char **cmd_argv = NULL;
8677 	static const struct option longopts[] = {
8678 	    { "version", no_argument, NULL, 'V' },
8679 	    { NULL, 0, NULL, 0}
8680 	};
8681 	char *diff_algo_str = NULL;
8682 
8683 	if (!isatty(STDIN_FILENO))
8684 		errx(1, "standard input is not a tty");
8685 
8686 	setlocale(LC_CTYPE, "");
8687 
8688 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8689 		switch (ch) {
8690 		case 'h':
8691 			hflag = 1;
8692 			break;
8693 		case 'V':
8694 			Vflag = 1;
8695 			break;
8696 		default:
8697 			usage(hflag, 1);
8698 			/* NOTREACHED */
8699 		}
8700 	}
8701 
8702 	argc -= optind;
8703 	argv += optind;
8704 	optind = 1;
8705 	optreset = 1;
8706 
8707 	if (Vflag) {
8708 		got_version_print_str();
8709 		return 0;
8710 	}
8711 
8712 #ifndef PROFILE
8713 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8714 	    NULL) == -1)
8715 		err(1, "pledge");
8716 #endif
8717 
8718 	if (argc == 0) {
8719 		if (hflag)
8720 			usage(hflag, 0);
8721 		/* Build an argument vector which runs a default command. */
8722 		cmd = &tog_commands[0];
8723 		argc = 1;
8724 		cmd_argv = make_argv(argc, cmd->name);
8725 	} else {
8726 		size_t i;
8727 
8728 		/* Did the user specify a command? */
8729 		for (i = 0; i < nitems(tog_commands); i++) {
8730 			if (strncmp(tog_commands[i].name, argv[0],
8731 			    strlen(argv[0])) == 0) {
8732 				cmd = &tog_commands[i];
8733 				break;
8734 			}
8735 		}
8736 	}
8737 
8738 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8739 	if (diff_algo_str) {
8740 		if (strcasecmp(diff_algo_str, "patience") == 0)
8741 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8742 		if (strcasecmp(diff_algo_str, "myers") == 0)
8743 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8744 	}
8745 
8746 	if (cmd == NULL) {
8747 		if (argc != 1)
8748 			usage(0, 1);
8749 		/* No command specified; try log with a path */
8750 		error = tog_log_with_path(argc, argv);
8751 	} else {
8752 		if (hflag)
8753 			cmd->cmd_usage();
8754 		else
8755 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8756 	}
8757 
8758 	endwin();
8759 	putchar('\n');
8760 	if (cmd_argv) {
8761 		int i;
8762 		for (i = 0; i < argc; i++)
8763 			free(cmd_argv[i]);
8764 		free(cmd_argv);
8765 	}
8766 
8767 	if (error && error->code != GOT_ERR_CANCELLED)
8768 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8769 	return 0;
8770 }