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 		/*
3120 		 * If the user has moved the cursor after we hit a match,
3121 		 * the position from where we should continue searching
3122 		 * might have changed.
3123 		 */
3124 		if (view->searching == TOG_SEARCH_FORWARD)
3125 			entry = TAILQ_NEXT(s->selected_entry, entry);
3126 		else
3127 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3128 			    entry);
3129 	} else {
3130 		entry = s->selected_entry;
3131 	}
3132 
3133 	while (1) {
3134 		int have_match = 0;
3135 
3136 		if (entry == NULL) {
3137 			if (s->thread_args.log_complete ||
3138 			    view->searching == TOG_SEARCH_BACKWARD) {
3139 				view->search_next_done =
3140 				    (s->matched_entry == NULL ?
3141 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3142 				s->search_entry = NULL;
3143 				return NULL;
3144 			}
3145 			/*
3146 			 * Poke the log thread for more commits and return,
3147 			 * allowing the main loop to make progress. Search
3148 			 * will resume at s->search_entry once we come back.
3149 			 */
3150 			s->thread_args.commits_needed++;
3151 			return trigger_log_thread(view, 0);
3152 		}
3153 
3154 		err = match_commit(&have_match, entry->id, entry->commit,
3155 		    &view->regex);
3156 		if (err)
3157 			break;
3158 		if (have_match) {
3159 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3160 			s->matched_entry = entry;
3161 			break;
3162 		}
3163 
3164 		s->search_entry = entry;
3165 		if (view->searching == TOG_SEARCH_FORWARD)
3166 			entry = TAILQ_NEXT(entry, entry);
3167 		else
3168 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3169 	}
3170 
3171 	if (s->matched_entry) {
3172 		int cur = s->selected_entry->idx;
3173 		while (cur < s->matched_entry->idx) {
3174 			err = input_log_view(NULL, view, KEY_DOWN);
3175 			if (err)
3176 				return err;
3177 			cur++;
3178 		}
3179 		while (cur > s->matched_entry->idx) {
3180 			err = input_log_view(NULL, view, KEY_UP);
3181 			if (err)
3182 				return err;
3183 			cur--;
3184 		}
3185 	}
3186 
3187 	s->search_entry = NULL;
3188 
3189 	return NULL;
3190 }
3191 
3192 static const struct got_error *
3193 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3194     struct got_repository *repo, const char *head_ref_name,
3195     const char *in_repo_path, int log_branches)
3196 {
3197 	const struct got_error *err = NULL;
3198 	struct tog_log_view_state *s = &view->state.log;
3199 	struct got_repository *thread_repo = NULL;
3200 	struct got_commit_graph *thread_graph = NULL;
3201 	int errcode;
3202 
3203 	if (in_repo_path != s->in_repo_path) {
3204 		free(s->in_repo_path);
3205 		s->in_repo_path = strdup(in_repo_path);
3206 		if (s->in_repo_path == NULL)
3207 			return got_error_from_errno("strdup");
3208 	}
3209 
3210 	/* The commit queue only contains commits being displayed. */
3211 	TAILQ_INIT(&s->real_commits.head);
3212 	s->real_commits.ncommits = 0;
3213 	s->commits = &s->real_commits;
3214 
3215 	TAILQ_INIT(&s->limit_commits.head);
3216 	s->limit_view = 0;
3217 	s->limit_commits.ncommits = 0;
3218 
3219 	s->repo = repo;
3220 	if (head_ref_name) {
3221 		s->head_ref_name = strdup(head_ref_name);
3222 		if (s->head_ref_name == NULL) {
3223 			err = got_error_from_errno("strdup");
3224 			goto done;
3225 		}
3226 	}
3227 	s->start_id = got_object_id_dup(start_id);
3228 	if (s->start_id == NULL) {
3229 		err = got_error_from_errno("got_object_id_dup");
3230 		goto done;
3231 	}
3232 	s->log_branches = log_branches;
3233 
3234 	STAILQ_INIT(&s->colors);
3235 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3236 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3237 		    get_color_value("TOG_COLOR_COMMIT"));
3238 		if (err)
3239 			goto done;
3240 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3241 		    get_color_value("TOG_COLOR_AUTHOR"));
3242 		if (err) {
3243 			free_colors(&s->colors);
3244 			goto done;
3245 		}
3246 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3247 		    get_color_value("TOG_COLOR_DATE"));
3248 		if (err) {
3249 			free_colors(&s->colors);
3250 			goto done;
3251 		}
3252 	}
3253 
3254 	view->show = show_log_view;
3255 	view->input = input_log_view;
3256 	view->resize = resize_log_view;
3257 	view->close = close_log_view;
3258 	view->search_start = search_start_log_view;
3259 	view->search_next = search_next_log_view;
3260 
3261 	if (s->thread_args.pack_fds == NULL) {
3262 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3263 		if (err)
3264 			goto done;
3265 	}
3266 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3267 	    s->thread_args.pack_fds);
3268 	if (err)
3269 		goto done;
3270 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3271 	    !s->log_branches);
3272 	if (err)
3273 		goto done;
3274 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3275 	    s->repo, NULL, NULL);
3276 	if (err)
3277 		goto done;
3278 
3279 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3280 	if (errcode) {
3281 		err = got_error_set_errno(errcode, "pthread_cond_init");
3282 		goto done;
3283 	}
3284 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3285 	if (errcode) {
3286 		err = got_error_set_errno(errcode, "pthread_cond_init");
3287 		goto done;
3288 	}
3289 
3290 	s->thread_args.commits_needed = view->nlines;
3291 	s->thread_args.graph = thread_graph;
3292 	s->thread_args.real_commits = &s->real_commits;
3293 	s->thread_args.limit_commits = &s->limit_commits;
3294 	s->thread_args.in_repo_path = s->in_repo_path;
3295 	s->thread_args.start_id = s->start_id;
3296 	s->thread_args.repo = thread_repo;
3297 	s->thread_args.log_complete = 0;
3298 	s->thread_args.quit = &s->quit;
3299 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3300 	s->thread_args.selected_entry = &s->selected_entry;
3301 	s->thread_args.searching = &view->searching;
3302 	s->thread_args.search_next_done = &view->search_next_done;
3303 	s->thread_args.regex = &view->regex;
3304 	s->thread_args.limiting = &s->limit_view;
3305 	s->thread_args.limit_regex = &s->limit_regex;
3306 	s->thread_args.limit_commits = &s->limit_commits;
3307 done:
3308 	if (err)
3309 		close_log_view(view);
3310 	return err;
3311 }
3312 
3313 static const struct got_error *
3314 show_log_view(struct tog_view *view)
3315 {
3316 	const struct got_error *err;
3317 	struct tog_log_view_state *s = &view->state.log;
3318 
3319 	if (s->thread == NULL) {
3320 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3321 		    &s->thread_args);
3322 		if (errcode)
3323 			return got_error_set_errno(errcode, "pthread_create");
3324 		if (s->thread_args.commits_needed > 0) {
3325 			err = trigger_log_thread(view, 1);
3326 			if (err)
3327 				return err;
3328 		}
3329 	}
3330 
3331 	return draw_commits(view);
3332 }
3333 
3334 static void
3335 log_move_cursor_up(struct tog_view *view, int page, int home)
3336 {
3337 	struct tog_log_view_state *s = &view->state.log;
3338 
3339 	if (s->first_displayed_entry == NULL)
3340 		return;
3341 	if (s->selected_entry->idx == 0)
3342 		view->count = 0;
3343 
3344 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3345 	    || home)
3346 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3347 
3348 	if (!page && !home && s->selected > 0)
3349 		--s->selected;
3350 	else
3351 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3352 
3353 	select_commit(s);
3354 	return;
3355 }
3356 
3357 static const struct got_error *
3358 log_move_cursor_down(struct tog_view *view, int page)
3359 {
3360 	struct tog_log_view_state	*s = &view->state.log;
3361 	const struct got_error		*err = NULL;
3362 	int				 eos = view->nlines - 2;
3363 
3364 	if (s->first_displayed_entry == NULL)
3365 		return NULL;
3366 
3367 	if (s->thread_args.log_complete &&
3368 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3369 		return NULL;
3370 
3371 	if (view_is_hsplit_top(view))
3372 		--eos;  /* border consumes the last line */
3373 
3374 	if (!page) {
3375 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3376 			++s->selected;
3377 		else
3378 			err = log_scroll_down(view, 1);
3379 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3380 		struct commit_queue_entry *entry;
3381 		int n;
3382 
3383 		s->selected = 0;
3384 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3385 		s->last_displayed_entry = entry;
3386 		for (n = 0; n <= eos; n++) {
3387 			if (entry == NULL)
3388 				break;
3389 			s->first_displayed_entry = entry;
3390 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3391 		}
3392 		if (n > 0)
3393 			s->selected = n - 1;
3394 	} else {
3395 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3396 		    s->thread_args.log_complete)
3397 			s->selected += MIN(page,
3398 			    s->commits->ncommits - s->selected_entry->idx - 1);
3399 		else
3400 			err = log_scroll_down(view, page);
3401 	}
3402 	if (err)
3403 		return err;
3404 
3405 	/*
3406 	 * We might necessarily overshoot in horizontal
3407 	 * splits; if so, select the last displayed commit.
3408 	 */
3409 	if (s->first_displayed_entry && s->last_displayed_entry) {
3410 		s->selected = MIN(s->selected,
3411 		    s->last_displayed_entry->idx -
3412 		    s->first_displayed_entry->idx);
3413 	}
3414 
3415 	select_commit(s);
3416 
3417 	if (s->thread_args.log_complete &&
3418 	    s->selected_entry->idx == s->commits->ncommits - 1)
3419 		view->count = 0;
3420 
3421 	return NULL;
3422 }
3423 
3424 static void
3425 view_get_split(struct tog_view *view, int *y, int *x)
3426 {
3427 	*x = 0;
3428 	*y = 0;
3429 
3430 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3431 		if (view->child && view->child->resized_y)
3432 			*y = view->child->resized_y;
3433 		else if (view->resized_y)
3434 			*y = view->resized_y;
3435 		else
3436 			*y = view_split_begin_y(view->lines);
3437 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3438 		if (view->child && view->child->resized_x)
3439 			*x = view->child->resized_x;
3440 		else if (view->resized_x)
3441 			*x = view->resized_x;
3442 		else
3443 			*x = view_split_begin_x(view->begin_x);
3444 	}
3445 }
3446 
3447 /* Split view horizontally at y and offset view->state->selected line. */
3448 static const struct got_error *
3449 view_init_hsplit(struct tog_view *view, int y)
3450 {
3451 	const struct got_error *err = NULL;
3452 
3453 	view->nlines = y;
3454 	view->ncols = COLS;
3455 	err = view_resize(view);
3456 	if (err)
3457 		return err;
3458 
3459 	err = offset_selection_down(view);
3460 
3461 	return err;
3462 }
3463 
3464 static const struct got_error *
3465 log_goto_line(struct tog_view *view, int nlines)
3466 {
3467 	const struct got_error		*err = NULL;
3468 	struct tog_log_view_state	*s = &view->state.log;
3469 	int				 g, idx = s->selected_entry->idx;
3470 
3471 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3472 		return NULL;
3473 
3474 	g = view->gline;
3475 	view->gline = 0;
3476 
3477 	if (g >= s->first_displayed_entry->idx + 1 &&
3478 	    g <= s->last_displayed_entry->idx + 1 &&
3479 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3480 		s->selected = g - s->first_displayed_entry->idx - 1;
3481 		select_commit(s);
3482 		return NULL;
3483 	}
3484 
3485 	if (idx + 1 < g) {
3486 		err = log_move_cursor_down(view, g - idx - 1);
3487 		if (!err && g > s->selected_entry->idx + 1)
3488 			err = log_move_cursor_down(view,
3489 			    g - s->first_displayed_entry->idx - 1);
3490 		if (err)
3491 			return err;
3492 	} else if (idx + 1 > g)
3493 		log_move_cursor_up(view, idx - g + 1, 0);
3494 
3495 	if (g < nlines && s->first_displayed_entry->idx == 0)
3496 		s->selected = g - 1;
3497 
3498 	select_commit(s);
3499 	return NULL;
3500 
3501 }
3502 
3503 static const struct got_error *
3504 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3505 {
3506 	const struct got_error *err = NULL;
3507 	struct tog_log_view_state *s = &view->state.log;
3508 	int eos, nscroll;
3509 
3510 	if (s->thread_args.load_all) {
3511 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3512 			s->thread_args.load_all = 0;
3513 		else if (s->thread_args.log_complete) {
3514 			err = log_move_cursor_down(view, s->commits->ncommits);
3515 			s->thread_args.load_all = 0;
3516 		}
3517 		if (err)
3518 			return err;
3519 	}
3520 
3521 	eos = nscroll = view->nlines - 1;
3522 	if (view_is_hsplit_top(view))
3523 		--eos;  /* border */
3524 
3525 	if (view->gline)
3526 		return log_goto_line(view, eos);
3527 
3528 	switch (ch) {
3529 	case '&':
3530 		err = limit_log_view(view);
3531 		break;
3532 	case 'q':
3533 		s->quit = 1;
3534 		break;
3535 	case '0':
3536 		view->x = 0;
3537 		break;
3538 	case '$':
3539 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3540 		view->count = 0;
3541 		break;
3542 	case KEY_RIGHT:
3543 	case 'l':
3544 		if (view->x + view->ncols / 2 < view->maxx)
3545 			view->x += 2;  /* move two columns right */
3546 		else
3547 			view->count = 0;
3548 		break;
3549 	case KEY_LEFT:
3550 	case 'h':
3551 		view->x -= MIN(view->x, 2);  /* move two columns back */
3552 		if (view->x <= 0)
3553 			view->count = 0;
3554 		break;
3555 	case 'k':
3556 	case KEY_UP:
3557 	case '<':
3558 	case ',':
3559 	case CTRL('p'):
3560 		log_move_cursor_up(view, 0, 0);
3561 		break;
3562 	case 'g':
3563 	case KEY_HOME:
3564 		log_move_cursor_up(view, 0, 1);
3565 		view->count = 0;
3566 		break;
3567 	case CTRL('u'):
3568 	case 'u':
3569 		nscroll /= 2;
3570 		/* FALL THROUGH */
3571 	case KEY_PPAGE:
3572 	case CTRL('b'):
3573 	case 'b':
3574 		log_move_cursor_up(view, nscroll, 0);
3575 		break;
3576 	case 'j':
3577 	case KEY_DOWN:
3578 	case '>':
3579 	case '.':
3580 	case CTRL('n'):
3581 		err = log_move_cursor_down(view, 0);
3582 		break;
3583 	case '@':
3584 		s->use_committer = !s->use_committer;
3585 		break;
3586 	case 'G':
3587 	case KEY_END: {
3588 		/* We don't know yet how many commits, so we're forced to
3589 		 * traverse them all. */
3590 		view->count = 0;
3591 		s->thread_args.load_all = 1;
3592 		if (!s->thread_args.log_complete)
3593 			return trigger_log_thread(view, 0);
3594 		err = log_move_cursor_down(view, s->commits->ncommits);
3595 		s->thread_args.load_all = 0;
3596 		break;
3597 	}
3598 	case CTRL('d'):
3599 	case 'd':
3600 		nscroll /= 2;
3601 		/* FALL THROUGH */
3602 	case KEY_NPAGE:
3603 	case CTRL('f'):
3604 	case 'f':
3605 	case ' ':
3606 		err = log_move_cursor_down(view, nscroll);
3607 		break;
3608 	case KEY_RESIZE:
3609 		if (s->selected > view->nlines - 2)
3610 			s->selected = view->nlines - 2;
3611 		if (s->selected > s->commits->ncommits - 1)
3612 			s->selected = s->commits->ncommits - 1;
3613 		select_commit(s);
3614 		if (s->commits->ncommits < view->nlines - 1 &&
3615 		    !s->thread_args.log_complete) {
3616 			s->thread_args.commits_needed += (view->nlines - 1) -
3617 			    s->commits->ncommits;
3618 			err = trigger_log_thread(view, 1);
3619 		}
3620 		break;
3621 	case KEY_ENTER:
3622 	case '\r':
3623 		view->count = 0;
3624 		if (s->selected_entry == NULL)
3625 			break;
3626 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3627 		break;
3628 	case 'T':
3629 		view->count = 0;
3630 		if (s->selected_entry == NULL)
3631 			break;
3632 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3633 		break;
3634 	case KEY_BACKSPACE:
3635 	case CTRL('l'):
3636 	case 'B':
3637 		view->count = 0;
3638 		if (ch == KEY_BACKSPACE &&
3639 		    got_path_is_root_dir(s->in_repo_path))
3640 			break;
3641 		err = stop_log_thread(s);
3642 		if (err)
3643 			return err;
3644 		if (ch == KEY_BACKSPACE) {
3645 			char *parent_path;
3646 			err = got_path_dirname(&parent_path, s->in_repo_path);
3647 			if (err)
3648 				return err;
3649 			free(s->in_repo_path);
3650 			s->in_repo_path = parent_path;
3651 			s->thread_args.in_repo_path = s->in_repo_path;
3652 		} else if (ch == CTRL('l')) {
3653 			struct got_object_id *start_id;
3654 			err = got_repo_match_object_id(&start_id, NULL,
3655 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3656 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3657 			if (err)
3658 				return err;
3659 			free(s->start_id);
3660 			s->start_id = start_id;
3661 			s->thread_args.start_id = s->start_id;
3662 		} else /* 'B' */
3663 			s->log_branches = !s->log_branches;
3664 
3665 		if (s->thread_args.pack_fds == NULL) {
3666 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3667 			if (err)
3668 				return err;
3669 		}
3670 		err = got_repo_open(&s->thread_args.repo,
3671 		    got_repo_get_path(s->repo), NULL,
3672 		    s->thread_args.pack_fds);
3673 		if (err)
3674 			return err;
3675 		tog_free_refs();
3676 		err = tog_load_refs(s->repo, 0);
3677 		if (err)
3678 			return err;
3679 		err = got_commit_graph_open(&s->thread_args.graph,
3680 		    s->in_repo_path, !s->log_branches);
3681 		if (err)
3682 			return err;
3683 		err = got_commit_graph_iter_start(s->thread_args.graph,
3684 		    s->start_id, s->repo, NULL, NULL);
3685 		if (err)
3686 			return err;
3687 		free_commits(&s->real_commits);
3688 		free_commits(&s->limit_commits);
3689 		s->first_displayed_entry = NULL;
3690 		s->last_displayed_entry = NULL;
3691 		s->selected_entry = NULL;
3692 		s->selected = 0;
3693 		s->thread_args.log_complete = 0;
3694 		s->quit = 0;
3695 		s->thread_args.commits_needed = view->lines;
3696 		s->matched_entry = NULL;
3697 		s->search_entry = NULL;
3698 		view->offset = 0;
3699 		break;
3700 	case 'R':
3701 		view->count = 0;
3702 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3703 		break;
3704 	default:
3705 		view->count = 0;
3706 		break;
3707 	}
3708 
3709 	return err;
3710 }
3711 
3712 static const struct got_error *
3713 apply_unveil(const char *repo_path, const char *worktree_path)
3714 {
3715 	const struct got_error *error;
3716 
3717 #ifdef PROFILE
3718 	if (unveil("gmon.out", "rwc") != 0)
3719 		return got_error_from_errno2("unveil", "gmon.out");
3720 #endif
3721 	if (repo_path && unveil(repo_path, "r") != 0)
3722 		return got_error_from_errno2("unveil", repo_path);
3723 
3724 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3725 		return got_error_from_errno2("unveil", worktree_path);
3726 
3727 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3728 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3729 
3730 	error = got_privsep_unveil_exec_helpers();
3731 	if (error != NULL)
3732 		return error;
3733 
3734 	if (unveil(NULL, NULL) != 0)
3735 		return got_error_from_errno("unveil");
3736 
3737 	return NULL;
3738 }
3739 
3740 static void
3741 init_curses(void)
3742 {
3743 	/*
3744 	 * Override default signal handlers before starting ncurses.
3745 	 * This should prevent ncurses from installing its own
3746 	 * broken cleanup() signal handler.
3747 	 */
3748 	signal(SIGWINCH, tog_sigwinch);
3749 	signal(SIGPIPE, tog_sigpipe);
3750 	signal(SIGCONT, tog_sigcont);
3751 	signal(SIGINT, tog_sigint);
3752 	signal(SIGTERM, tog_sigterm);
3753 
3754 	initscr();
3755 	cbreak();
3756 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3757 	noecho();
3758 	nonl();
3759 	intrflush(stdscr, FALSE);
3760 	keypad(stdscr, TRUE);
3761 	curs_set(0);
3762 	if (getenv("TOG_COLORS") != NULL) {
3763 		start_color();
3764 		use_default_colors();
3765 	}
3766 }
3767 
3768 static const struct got_error *
3769 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3770     struct got_repository *repo, struct got_worktree *worktree)
3771 {
3772 	const struct got_error *err = NULL;
3773 
3774 	if (argc == 0) {
3775 		*in_repo_path = strdup("/");
3776 		if (*in_repo_path == NULL)
3777 			return got_error_from_errno("strdup");
3778 		return NULL;
3779 	}
3780 
3781 	if (worktree) {
3782 		const char *prefix = got_worktree_get_path_prefix(worktree);
3783 		char *p;
3784 
3785 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3786 		if (err)
3787 			return err;
3788 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3789 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3790 		    p) == -1) {
3791 			err = got_error_from_errno("asprintf");
3792 			*in_repo_path = NULL;
3793 		}
3794 		free(p);
3795 	} else
3796 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3797 
3798 	return err;
3799 }
3800 
3801 static const struct got_error *
3802 cmd_log(int argc, char *argv[])
3803 {
3804 	const struct got_error *error;
3805 	struct got_repository *repo = NULL;
3806 	struct got_worktree *worktree = NULL;
3807 	struct got_object_id *start_id = NULL;
3808 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3809 	char *start_commit = NULL, *label = NULL;
3810 	struct got_reference *ref = NULL;
3811 	const char *head_ref_name = NULL;
3812 	int ch, log_branches = 0;
3813 	struct tog_view *view;
3814 	int *pack_fds = NULL;
3815 
3816 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3817 		switch (ch) {
3818 		case 'b':
3819 			log_branches = 1;
3820 			break;
3821 		case 'c':
3822 			start_commit = optarg;
3823 			break;
3824 		case 'r':
3825 			repo_path = realpath(optarg, NULL);
3826 			if (repo_path == NULL)
3827 				return got_error_from_errno2("realpath",
3828 				    optarg);
3829 			break;
3830 		default:
3831 			usage_log();
3832 			/* NOTREACHED */
3833 		}
3834 	}
3835 
3836 	argc -= optind;
3837 	argv += optind;
3838 
3839 	if (argc > 1)
3840 		usage_log();
3841 
3842 	error = got_repo_pack_fds_open(&pack_fds);
3843 	if (error != NULL)
3844 		goto done;
3845 
3846 	if (repo_path == NULL) {
3847 		cwd = getcwd(NULL, 0);
3848 		if (cwd == NULL)
3849 			return got_error_from_errno("getcwd");
3850 		error = got_worktree_open(&worktree, cwd);
3851 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3852 			goto done;
3853 		if (worktree)
3854 			repo_path =
3855 			    strdup(got_worktree_get_repo_path(worktree));
3856 		else
3857 			repo_path = strdup(cwd);
3858 		if (repo_path == NULL) {
3859 			error = got_error_from_errno("strdup");
3860 			goto done;
3861 		}
3862 	}
3863 
3864 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3865 	if (error != NULL)
3866 		goto done;
3867 
3868 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3869 	    repo, worktree);
3870 	if (error)
3871 		goto done;
3872 
3873 	init_curses();
3874 
3875 	error = apply_unveil(got_repo_get_path(repo),
3876 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3877 	if (error)
3878 		goto done;
3879 
3880 	/* already loaded by tog_log_with_path()? */
3881 	if (TAILQ_EMPTY(&tog_refs)) {
3882 		error = tog_load_refs(repo, 0);
3883 		if (error)
3884 			goto done;
3885 	}
3886 
3887 	if (start_commit == NULL) {
3888 		error = got_repo_match_object_id(&start_id, &label,
3889 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3890 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3891 		if (error)
3892 			goto done;
3893 		head_ref_name = label;
3894 	} else {
3895 		error = got_ref_open(&ref, repo, start_commit, 0);
3896 		if (error == NULL)
3897 			head_ref_name = got_ref_get_name(ref);
3898 		else if (error->code != GOT_ERR_NOT_REF)
3899 			goto done;
3900 		error = got_repo_match_object_id(&start_id, NULL,
3901 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3902 		if (error)
3903 			goto done;
3904 	}
3905 
3906 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3907 	if (view == NULL) {
3908 		error = got_error_from_errno("view_open");
3909 		goto done;
3910 	}
3911 	error = open_log_view(view, start_id, repo, head_ref_name,
3912 	    in_repo_path, log_branches);
3913 	if (error)
3914 		goto done;
3915 	if (worktree) {
3916 		/* Release work tree lock. */
3917 		got_worktree_close(worktree);
3918 		worktree = NULL;
3919 	}
3920 	error = view_loop(view);
3921 done:
3922 	free(in_repo_path);
3923 	free(repo_path);
3924 	free(cwd);
3925 	free(start_id);
3926 	free(label);
3927 	if (ref)
3928 		got_ref_close(ref);
3929 	if (repo) {
3930 		const struct got_error *close_err = got_repo_close(repo);
3931 		if (error == NULL)
3932 			error = close_err;
3933 	}
3934 	if (worktree)
3935 		got_worktree_close(worktree);
3936 	if (pack_fds) {
3937 		const struct got_error *pack_err =
3938 		    got_repo_pack_fds_close(pack_fds);
3939 		if (error == NULL)
3940 			error = pack_err;
3941 	}
3942 	tog_free_refs();
3943 	return error;
3944 }
3945 
3946 __dead static void
3947 usage_diff(void)
3948 {
3949 	endwin();
3950 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3951 	    "object1 object2\n", getprogname());
3952 	exit(1);
3953 }
3954 
3955 static int
3956 match_line(const char *line, regex_t *regex, size_t nmatch,
3957     regmatch_t *regmatch)
3958 {
3959 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3960 }
3961 
3962 static struct tog_color *
3963 match_color(struct tog_colors *colors, const char *line)
3964 {
3965 	struct tog_color *tc = NULL;
3966 
3967 	STAILQ_FOREACH(tc, colors, entry) {
3968 		if (match_line(line, &tc->regex, 0, NULL))
3969 			return tc;
3970 	}
3971 
3972 	return NULL;
3973 }
3974 
3975 static const struct got_error *
3976 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3977     WINDOW *window, int skipcol, regmatch_t *regmatch)
3978 {
3979 	const struct got_error *err = NULL;
3980 	char *exstr = NULL;
3981 	wchar_t *wline = NULL;
3982 	int rme, rms, n, width, scrollx;
3983 	int width0 = 0, width1 = 0, width2 = 0;
3984 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3985 
3986 	*wtotal = 0;
3987 
3988 	rms = regmatch->rm_so;
3989 	rme = regmatch->rm_eo;
3990 
3991 	err = expand_tab(&exstr, line);
3992 	if (err)
3993 		return err;
3994 
3995 	/* Split the line into 3 segments, according to match offsets. */
3996 	seg0 = strndup(exstr, rms);
3997 	if (seg0 == NULL) {
3998 		err = got_error_from_errno("strndup");
3999 		goto done;
4000 	}
4001 	seg1 = strndup(exstr + rms, rme - rms);
4002 	if (seg1 == NULL) {
4003 		err = got_error_from_errno("strndup");
4004 		goto done;
4005 	}
4006 	seg2 = strdup(exstr + rme);
4007 	if (seg2 == NULL) {
4008 		err = got_error_from_errno("strndup");
4009 		goto done;
4010 	}
4011 
4012 	/* draw up to matched token if we haven't scrolled past it */
4013 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4014 	    col_tab_align, 1);
4015 	if (err)
4016 		goto done;
4017 	n = MAX(width0 - skipcol, 0);
4018 	if (n) {
4019 		free(wline);
4020 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4021 		    wlimit, col_tab_align, 1);
4022 		if (err)
4023 			goto done;
4024 		waddwstr(window, &wline[scrollx]);
4025 		wlimit -= width;
4026 		*wtotal += width;
4027 	}
4028 
4029 	if (wlimit > 0) {
4030 		int i = 0, w = 0;
4031 		size_t wlen;
4032 
4033 		free(wline);
4034 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4035 		    col_tab_align, 1);
4036 		if (err)
4037 			goto done;
4038 		wlen = wcslen(wline);
4039 		while (i < wlen) {
4040 			width = wcwidth(wline[i]);
4041 			if (width == -1) {
4042 				/* should not happen, tabs are expanded */
4043 				err = got_error(GOT_ERR_RANGE);
4044 				goto done;
4045 			}
4046 			if (width0 + w + width > skipcol)
4047 				break;
4048 			w += width;
4049 			i++;
4050 		}
4051 		/* draw (visible part of) matched token (if scrolled into it) */
4052 		if (width1 - w > 0) {
4053 			wattron(window, A_STANDOUT);
4054 			waddwstr(window, &wline[i]);
4055 			wattroff(window, A_STANDOUT);
4056 			wlimit -= (width1 - w);
4057 			*wtotal += (width1 - w);
4058 		}
4059 	}
4060 
4061 	if (wlimit > 0) {  /* draw rest of line */
4062 		free(wline);
4063 		if (skipcol > width0 + width1) {
4064 			err = format_line(&wline, &width2, &scrollx, seg2,
4065 			    skipcol - (width0 + width1), wlimit,
4066 			    col_tab_align, 1);
4067 			if (err)
4068 				goto done;
4069 			waddwstr(window, &wline[scrollx]);
4070 		} else {
4071 			err = format_line(&wline, &width2, NULL, seg2, 0,
4072 			    wlimit, col_tab_align, 1);
4073 			if (err)
4074 				goto done;
4075 			waddwstr(window, wline);
4076 		}
4077 		*wtotal += width2;
4078 	}
4079 done:
4080 	free(wline);
4081 	free(exstr);
4082 	free(seg0);
4083 	free(seg1);
4084 	free(seg2);
4085 	return err;
4086 }
4087 
4088 static int
4089 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4090 {
4091 	FILE	*f = NULL;
4092 	int	*eof, *first, *selected;
4093 
4094 	if (view->type == TOG_VIEW_DIFF) {
4095 		struct tog_diff_view_state *s = &view->state.diff;
4096 
4097 		first = &s->first_displayed_line;
4098 		selected = first;
4099 		eof = &s->eof;
4100 		f = s->f;
4101 	} else if (view->type == TOG_VIEW_BLAME) {
4102 		struct tog_blame_view_state *s = &view->state.blame;
4103 
4104 		first = &s->first_displayed_line;
4105 		selected = &s->selected_line;
4106 		eof = &s->eof;
4107 		f = s->blame.f;
4108 	} else
4109 		return 0;
4110 
4111 	/* Center gline in the middle of the page like vi(1). */
4112 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4113 		return 0;
4114 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4115 		rewind(f);
4116 		*eof = 0;
4117 		*first = 1;
4118 		*lineno = 0;
4119 		*nprinted = 0;
4120 		return 0;
4121 	}
4122 
4123 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4124 		view->gline : (view->nlines - 3) / 2 + 1;
4125 	view->gline = 0;
4126 
4127 	return 1;
4128 }
4129 
4130 static const struct got_error *
4131 draw_file(struct tog_view *view, const char *header)
4132 {
4133 	struct tog_diff_view_state *s = &view->state.diff;
4134 	regmatch_t *regmatch = &view->regmatch;
4135 	const struct got_error *err;
4136 	int nprinted = 0;
4137 	char *line;
4138 	size_t linesize = 0;
4139 	ssize_t linelen;
4140 	wchar_t *wline;
4141 	int width;
4142 	int max_lines = view->nlines;
4143 	int nlines = s->nlines;
4144 	off_t line_offset;
4145 
4146 	s->lineno = s->first_displayed_line - 1;
4147 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4148 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4149 		return got_error_from_errno("fseek");
4150 
4151 	werase(view->window);
4152 
4153 	if (view->gline > s->nlines - 1)
4154 		view->gline = s->nlines - 1;
4155 
4156 	if (header) {
4157 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4158 		    1 : view->gline - (view->nlines - 3) / 2 :
4159 		    s->lineno + s->selected_line;
4160 
4161 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4162 			return got_error_from_errno("asprintf");
4163 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4164 		    0, 0);
4165 		free(line);
4166 		if (err)
4167 			return err;
4168 
4169 		if (view_needs_focus_indication(view))
4170 			wstandout(view->window);
4171 		waddwstr(view->window, wline);
4172 		free(wline);
4173 		wline = NULL;
4174 		while (width++ < view->ncols)
4175 			waddch(view->window, ' ');
4176 		if (view_needs_focus_indication(view))
4177 			wstandend(view->window);
4178 
4179 		if (max_lines <= 1)
4180 			return NULL;
4181 		max_lines--;
4182 	}
4183 
4184 	s->eof = 0;
4185 	view->maxx = 0;
4186 	line = NULL;
4187 	while (max_lines > 0 && nprinted < max_lines) {
4188 		enum got_diff_line_type linetype;
4189 		attr_t attr = 0;
4190 
4191 		linelen = getline(&line, &linesize, s->f);
4192 		if (linelen == -1) {
4193 			if (feof(s->f)) {
4194 				s->eof = 1;
4195 				break;
4196 			}
4197 			free(line);
4198 			return got_ferror(s->f, GOT_ERR_IO);
4199 		}
4200 
4201 		if (++s->lineno < s->first_displayed_line)
4202 			continue;
4203 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4204 			continue;
4205 		if (s->lineno == view->hiline)
4206 			attr = A_STANDOUT;
4207 
4208 		/* Set view->maxx based on full line length. */
4209 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4210 		    view->x ? 1 : 0);
4211 		if (err) {
4212 			free(line);
4213 			return err;
4214 		}
4215 		view->maxx = MAX(view->maxx, width);
4216 		free(wline);
4217 		wline = NULL;
4218 
4219 		linetype = s->lines[s->lineno].type;
4220 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4221 		    linetype < GOT_DIFF_LINE_CONTEXT)
4222 			attr |= COLOR_PAIR(linetype);
4223 		if (attr)
4224 			wattron(view->window, attr);
4225 		if (s->first_displayed_line + nprinted == s->matched_line &&
4226 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4227 			err = add_matched_line(&width, line, view->ncols, 0,
4228 			    view->window, view->x, regmatch);
4229 			if (err) {
4230 				free(line);
4231 				return err;
4232 			}
4233 		} else {
4234 			int skip;
4235 			err = format_line(&wline, &width, &skip, line,
4236 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4237 			if (err) {
4238 				free(line);
4239 				return err;
4240 			}
4241 			waddwstr(view->window, &wline[skip]);
4242 			free(wline);
4243 			wline = NULL;
4244 		}
4245 		if (s->lineno == view->hiline) {
4246 			/* highlight full gline length */
4247 			while (width++ < view->ncols)
4248 				waddch(view->window, ' ');
4249 		} else {
4250 			if (width <= view->ncols - 1)
4251 				waddch(view->window, '\n');
4252 		}
4253 		if (attr)
4254 			wattroff(view->window, attr);
4255 		if (++nprinted == 1)
4256 			s->first_displayed_line = s->lineno;
4257 	}
4258 	free(line);
4259 	if (nprinted >= 1)
4260 		s->last_displayed_line = s->first_displayed_line +
4261 		    (nprinted - 1);
4262 	else
4263 		s->last_displayed_line = s->first_displayed_line;
4264 
4265 	view_border(view);
4266 
4267 	if (s->eof) {
4268 		while (nprinted < view->nlines) {
4269 			waddch(view->window, '\n');
4270 			nprinted++;
4271 		}
4272 
4273 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4274 		    view->ncols, 0, 0);
4275 		if (err) {
4276 			return err;
4277 		}
4278 
4279 		wstandout(view->window);
4280 		waddwstr(view->window, wline);
4281 		free(wline);
4282 		wline = NULL;
4283 		wstandend(view->window);
4284 	}
4285 
4286 	return NULL;
4287 }
4288 
4289 static char *
4290 get_datestr(time_t *time, char *datebuf)
4291 {
4292 	struct tm mytm, *tm;
4293 	char *p, *s;
4294 
4295 	tm = gmtime_r(time, &mytm);
4296 	if (tm == NULL)
4297 		return NULL;
4298 	s = asctime_r(tm, datebuf);
4299 	if (s == NULL)
4300 		return NULL;
4301 	p = strchr(s, '\n');
4302 	if (p)
4303 		*p = '\0';
4304 	return s;
4305 }
4306 
4307 static const struct got_error *
4308 get_changed_paths(struct got_pathlist_head *paths,
4309     struct got_commit_object *commit, struct got_repository *repo)
4310 {
4311 	const struct got_error *err = NULL;
4312 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4313 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4314 	struct got_object_qid *qid;
4315 
4316 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4317 	if (qid != NULL) {
4318 		struct got_commit_object *pcommit;
4319 		err = got_object_open_as_commit(&pcommit, repo,
4320 		    &qid->id);
4321 		if (err)
4322 			return err;
4323 
4324 		tree_id1 = got_object_id_dup(
4325 		    got_object_commit_get_tree_id(pcommit));
4326 		if (tree_id1 == NULL) {
4327 			got_object_commit_close(pcommit);
4328 			return got_error_from_errno("got_object_id_dup");
4329 		}
4330 		got_object_commit_close(pcommit);
4331 
4332 	}
4333 
4334 	if (tree_id1) {
4335 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4336 		if (err)
4337 			goto done;
4338 	}
4339 
4340 	tree_id2 = got_object_commit_get_tree_id(commit);
4341 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4342 	if (err)
4343 		goto done;
4344 
4345 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4346 	    got_diff_tree_collect_changed_paths, paths, 0);
4347 done:
4348 	if (tree1)
4349 		got_object_tree_close(tree1);
4350 	if (tree2)
4351 		got_object_tree_close(tree2);
4352 	free(tree_id1);
4353 	return err;
4354 }
4355 
4356 static const struct got_error *
4357 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4358     off_t off, uint8_t type)
4359 {
4360 	struct got_diff_line *p;
4361 
4362 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4363 	if (p == NULL)
4364 		return got_error_from_errno("reallocarray");
4365 	*lines = p;
4366 	(*lines)[*nlines].offset = off;
4367 	(*lines)[*nlines].type = type;
4368 	(*nlines)++;
4369 
4370 	return NULL;
4371 }
4372 
4373 static const struct got_error *
4374 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4375     struct got_object_id *commit_id, struct got_reflist_head *refs,
4376     struct got_repository *repo, FILE *outfile)
4377 {
4378 	const struct got_error *err = NULL;
4379 	char datebuf[26], *datestr;
4380 	struct got_commit_object *commit;
4381 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4382 	time_t committer_time;
4383 	const char *author, *committer;
4384 	char *refs_str = NULL;
4385 	struct got_pathlist_head changed_paths;
4386 	struct got_pathlist_entry *pe;
4387 	off_t outoff = 0;
4388 	int n;
4389 
4390 	TAILQ_INIT(&changed_paths);
4391 
4392 	if (refs) {
4393 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4394 		if (err)
4395 			return err;
4396 	}
4397 
4398 	err = got_object_open_as_commit(&commit, repo, commit_id);
4399 	if (err)
4400 		return err;
4401 
4402 	err = got_object_id_str(&id_str, commit_id);
4403 	if (err) {
4404 		err = got_error_from_errno("got_object_id_str");
4405 		goto done;
4406 	}
4407 
4408 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4409 	if (err)
4410 		goto done;
4411 
4412 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4413 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4414 	if (n < 0) {
4415 		err = got_error_from_errno("fprintf");
4416 		goto done;
4417 	}
4418 	outoff += n;
4419 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4420 	if (err)
4421 		goto done;
4422 
4423 	n = fprintf(outfile, "from: %s\n",
4424 	    got_object_commit_get_author(commit));
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_AUTHOR);
4431 	if (err)
4432 		goto done;
4433 
4434 	committer_time = got_object_commit_get_committer_time(commit);
4435 	datestr = get_datestr(&committer_time, datebuf);
4436 	if (datestr) {
4437 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4438 		if (n < 0) {
4439 			err = got_error_from_errno("fprintf");
4440 			goto done;
4441 		}
4442 		outoff += n;
4443 		err = add_line_metadata(lines, nlines, outoff,
4444 		    GOT_DIFF_LINE_DATE);
4445 		if (err)
4446 			goto done;
4447 	}
4448 	author = got_object_commit_get_author(commit);
4449 	committer = got_object_commit_get_committer(commit);
4450 	if (strcmp(author, committer) != 0) {
4451 		n = fprintf(outfile, "via: %s\n", committer);
4452 		if (n < 0) {
4453 			err = got_error_from_errno("fprintf");
4454 			goto done;
4455 		}
4456 		outoff += n;
4457 		err = add_line_metadata(lines, nlines, outoff,
4458 		    GOT_DIFF_LINE_AUTHOR);
4459 		if (err)
4460 			goto done;
4461 	}
4462 	if (got_object_commit_get_nparents(commit) > 1) {
4463 		const struct got_object_id_queue *parent_ids;
4464 		struct got_object_qid *qid;
4465 		int pn = 1;
4466 		parent_ids = got_object_commit_get_parent_ids(commit);
4467 		STAILQ_FOREACH(qid, parent_ids, entry) {
4468 			err = got_object_id_str(&id_str, &qid->id);
4469 			if (err)
4470 				goto done;
4471 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4472 			if (n < 0) {
4473 				err = got_error_from_errno("fprintf");
4474 				goto done;
4475 			}
4476 			outoff += n;
4477 			err = add_line_metadata(lines, nlines, outoff,
4478 			    GOT_DIFF_LINE_META);
4479 			if (err)
4480 				goto done;
4481 			free(id_str);
4482 			id_str = NULL;
4483 		}
4484 	}
4485 
4486 	err = got_object_commit_get_logmsg(&logmsg, commit);
4487 	if (err)
4488 		goto done;
4489 	s = logmsg;
4490 	while ((line = strsep(&s, "\n")) != NULL) {
4491 		n = fprintf(outfile, "%s\n", line);
4492 		if (n < 0) {
4493 			err = got_error_from_errno("fprintf");
4494 			goto done;
4495 		}
4496 		outoff += n;
4497 		err = add_line_metadata(lines, nlines, outoff,
4498 		    GOT_DIFF_LINE_LOGMSG);
4499 		if (err)
4500 			goto done;
4501 	}
4502 
4503 	err = get_changed_paths(&changed_paths, commit, repo);
4504 	if (err)
4505 		goto done;
4506 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4507 		struct got_diff_changed_path *cp = pe->data;
4508 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4509 		if (n < 0) {
4510 			err = got_error_from_errno("fprintf");
4511 			goto done;
4512 		}
4513 		outoff += n;
4514 		err = add_line_metadata(lines, nlines, outoff,
4515 		    GOT_DIFF_LINE_CHANGES);
4516 		if (err)
4517 			goto done;
4518 		free((char *)pe->path);
4519 		free(pe->data);
4520 	}
4521 
4522 	fputc('\n', outfile);
4523 	outoff++;
4524 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4525 done:
4526 	got_pathlist_free(&changed_paths);
4527 	free(id_str);
4528 	free(logmsg);
4529 	free(refs_str);
4530 	got_object_commit_close(commit);
4531 	if (err) {
4532 		free(*lines);
4533 		*lines = NULL;
4534 		*nlines = 0;
4535 	}
4536 	return err;
4537 }
4538 
4539 static const struct got_error *
4540 create_diff(struct tog_diff_view_state *s)
4541 {
4542 	const struct got_error *err = NULL;
4543 	FILE *f = NULL;
4544 	int obj_type;
4545 
4546 	free(s->lines);
4547 	s->lines = malloc(sizeof(*s->lines));
4548 	if (s->lines == NULL)
4549 		return got_error_from_errno("malloc");
4550 	s->nlines = 0;
4551 
4552 	f = got_opentemp();
4553 	if (f == NULL) {
4554 		err = got_error_from_errno("got_opentemp");
4555 		goto done;
4556 	}
4557 	if (s->f && fclose(s->f) == EOF) {
4558 		err = got_error_from_errno("fclose");
4559 		goto done;
4560 	}
4561 	s->f = f;
4562 
4563 	if (s->id1)
4564 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4565 	else
4566 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4567 	if (err)
4568 		goto done;
4569 
4570 	switch (obj_type) {
4571 	case GOT_OBJ_TYPE_BLOB:
4572 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4573 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4574 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4575 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4576 		break;
4577 	case GOT_OBJ_TYPE_TREE:
4578 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4579 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4580 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4581 		    s->force_text_diff, s->repo, s->f);
4582 		break;
4583 	case GOT_OBJ_TYPE_COMMIT: {
4584 		const struct got_object_id_queue *parent_ids;
4585 		struct got_object_qid *pid;
4586 		struct got_commit_object *commit2;
4587 		struct got_reflist_head *refs;
4588 
4589 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4590 		if (err)
4591 			goto done;
4592 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4593 		/* Show commit info if we're diffing to a parent/root commit. */
4594 		if (s->id1 == NULL) {
4595 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4596 			    refs, s->repo, s->f);
4597 			if (err)
4598 				goto done;
4599 		} else {
4600 			parent_ids = got_object_commit_get_parent_ids(commit2);
4601 			STAILQ_FOREACH(pid, parent_ids, entry) {
4602 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4603 					err = write_commit_info(&s->lines,
4604 					    &s->nlines, s->id2, refs, s->repo,
4605 					    s->f);
4606 					if (err)
4607 						goto done;
4608 					break;
4609 				}
4610 			}
4611 		}
4612 		got_object_commit_close(commit2);
4613 
4614 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4615 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4616 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4617 		    s->force_text_diff, s->repo, s->f);
4618 		break;
4619 	}
4620 	default:
4621 		err = got_error(GOT_ERR_OBJ_TYPE);
4622 		break;
4623 	}
4624 done:
4625 	if (s->f && fflush(s->f) != 0 && err == NULL)
4626 		err = got_error_from_errno("fflush");
4627 	return err;
4628 }
4629 
4630 static void
4631 diff_view_indicate_progress(struct tog_view *view)
4632 {
4633 	mvwaddstr(view->window, 0, 0, "diffing...");
4634 	update_panels();
4635 	doupdate();
4636 }
4637 
4638 static const struct got_error *
4639 search_start_diff_view(struct tog_view *view)
4640 {
4641 	struct tog_diff_view_state *s = &view->state.diff;
4642 
4643 	s->matched_line = 0;
4644 	return NULL;
4645 }
4646 
4647 static const struct got_error *
4648 search_next_diff_view(struct tog_view *view)
4649 {
4650 	struct tog_diff_view_state *s = &view->state.diff;
4651 	const struct got_error *err = NULL;
4652 	int lineno;
4653 	char *line = NULL;
4654 	size_t linesize = 0;
4655 	ssize_t linelen;
4656 
4657 	if (!view->searching) {
4658 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4659 		return NULL;
4660 	}
4661 
4662 	if (s->matched_line) {
4663 		if (view->searching == TOG_SEARCH_FORWARD)
4664 			lineno = s->matched_line + 1;
4665 		else
4666 			lineno = s->matched_line - 1;
4667 	} else
4668 		lineno = s->first_displayed_line;
4669 
4670 	while (1) {
4671 		off_t offset;
4672 
4673 		if (lineno <= 0 || lineno > s->nlines) {
4674 			if (s->matched_line == 0) {
4675 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4676 				break;
4677 			}
4678 
4679 			if (view->searching == TOG_SEARCH_FORWARD)
4680 				lineno = 1;
4681 			else
4682 				lineno = s->nlines;
4683 		}
4684 
4685 		offset = s->lines[lineno - 1].offset;
4686 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4687 			free(line);
4688 			return got_error_from_errno("fseeko");
4689 		}
4690 		linelen = getline(&line, &linesize, s->f);
4691 		if (linelen != -1) {
4692 			char *exstr;
4693 			err = expand_tab(&exstr, line);
4694 			if (err)
4695 				break;
4696 			if (match_line(exstr, &view->regex, 1,
4697 			    &view->regmatch)) {
4698 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4699 				s->matched_line = lineno;
4700 				free(exstr);
4701 				break;
4702 			}
4703 			free(exstr);
4704 		}
4705 		if (view->searching == TOG_SEARCH_FORWARD)
4706 			lineno++;
4707 		else
4708 			lineno--;
4709 	}
4710 	free(line);
4711 
4712 	if (s->matched_line) {
4713 		s->first_displayed_line = s->matched_line;
4714 		s->selected_line = 1;
4715 	}
4716 
4717 	return err;
4718 }
4719 
4720 static const struct got_error *
4721 close_diff_view(struct tog_view *view)
4722 {
4723 	const struct got_error *err = NULL;
4724 	struct tog_diff_view_state *s = &view->state.diff;
4725 
4726 	free(s->id1);
4727 	s->id1 = NULL;
4728 	free(s->id2);
4729 	s->id2 = NULL;
4730 	if (s->f && fclose(s->f) == EOF)
4731 		err = got_error_from_errno("fclose");
4732 	s->f = NULL;
4733 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4734 		err = got_error_from_errno("fclose");
4735 	s->f1 = NULL;
4736 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4737 		err = got_error_from_errno("fclose");
4738 	s->f2 = NULL;
4739 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4740 		err = got_error_from_errno("close");
4741 	s->fd1 = -1;
4742 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4743 		err = got_error_from_errno("close");
4744 	s->fd2 = -1;
4745 	free(s->lines);
4746 	s->lines = NULL;
4747 	s->nlines = 0;
4748 	return err;
4749 }
4750 
4751 static const struct got_error *
4752 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4753     struct got_object_id *id2, const char *label1, const char *label2,
4754     int diff_context, int ignore_whitespace, int force_text_diff,
4755     struct tog_view *parent_view, struct got_repository *repo)
4756 {
4757 	const struct got_error *err;
4758 	struct tog_diff_view_state *s = &view->state.diff;
4759 
4760 	memset(s, 0, sizeof(*s));
4761 	s->fd1 = -1;
4762 	s->fd2 = -1;
4763 
4764 	if (id1 != NULL && id2 != NULL) {
4765 	    int type1, type2;
4766 	    err = got_object_get_type(&type1, repo, id1);
4767 	    if (err)
4768 		return err;
4769 	    err = got_object_get_type(&type2, repo, id2);
4770 	    if (err)
4771 		return err;
4772 
4773 	    if (type1 != type2)
4774 		return got_error(GOT_ERR_OBJ_TYPE);
4775 	}
4776 	s->first_displayed_line = 1;
4777 	s->last_displayed_line = view->nlines;
4778 	s->selected_line = 1;
4779 	s->repo = repo;
4780 	s->id1 = id1;
4781 	s->id2 = id2;
4782 	s->label1 = label1;
4783 	s->label2 = label2;
4784 
4785 	if (id1) {
4786 		s->id1 = got_object_id_dup(id1);
4787 		if (s->id1 == NULL)
4788 			return got_error_from_errno("got_object_id_dup");
4789 	} else
4790 		s->id1 = NULL;
4791 
4792 	s->id2 = got_object_id_dup(id2);
4793 	if (s->id2 == NULL) {
4794 		err = got_error_from_errno("got_object_id_dup");
4795 		goto done;
4796 	}
4797 
4798 	s->f1 = got_opentemp();
4799 	if (s->f1 == NULL) {
4800 		err = got_error_from_errno("got_opentemp");
4801 		goto done;
4802 	}
4803 
4804 	s->f2 = got_opentemp();
4805 	if (s->f2 == NULL) {
4806 		err = got_error_from_errno("got_opentemp");
4807 		goto done;
4808 	}
4809 
4810 	s->fd1 = got_opentempfd();
4811 	if (s->fd1 == -1) {
4812 		err = got_error_from_errno("got_opentempfd");
4813 		goto done;
4814 	}
4815 
4816 	s->fd2 = got_opentempfd();
4817 	if (s->fd2 == -1) {
4818 		err = got_error_from_errno("got_opentempfd");
4819 		goto done;
4820 	}
4821 
4822 	s->first_displayed_line = 1;
4823 	s->last_displayed_line = view->nlines;
4824 	s->diff_context = diff_context;
4825 	s->ignore_whitespace = ignore_whitespace;
4826 	s->force_text_diff = force_text_diff;
4827 	s->parent_view = parent_view;
4828 	s->repo = repo;
4829 
4830 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4831 		int rc;
4832 
4833 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4834 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4835 		if (rc != ERR)
4836 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4837 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4838 		if (rc != ERR)
4839 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4840 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4841 		if (rc != ERR)
4842 			rc = init_pair(GOT_DIFF_LINE_META,
4843 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4844 		if (rc != ERR)
4845 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4846 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4847 		if (rc != ERR)
4848 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4849 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4850 		if (rc != ERR)
4851 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4852 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4853 		if (rc != ERR)
4854 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4855 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4856 		if (rc != ERR)
4857 			rc = init_pair(GOT_DIFF_LINE_DATE,
4858 			    get_color_value("TOG_COLOR_DATE"), -1);
4859 		if (rc == ERR) {
4860 			err = got_error(GOT_ERR_RANGE);
4861 			goto done;
4862 		}
4863 	}
4864 
4865 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4866 	    view_is_splitscreen(view))
4867 		show_log_view(parent_view); /* draw border */
4868 	diff_view_indicate_progress(view);
4869 
4870 	err = create_diff(s);
4871 
4872 	view->show = show_diff_view;
4873 	view->input = input_diff_view;
4874 	view->reset = reset_diff_view;
4875 	view->close = close_diff_view;
4876 	view->search_start = search_start_diff_view;
4877 	view->search_next = search_next_diff_view;
4878 done:
4879 	if (err)
4880 		close_diff_view(view);
4881 	return err;
4882 }
4883 
4884 static const struct got_error *
4885 show_diff_view(struct tog_view *view)
4886 {
4887 	const struct got_error *err;
4888 	struct tog_diff_view_state *s = &view->state.diff;
4889 	char *id_str1 = NULL, *id_str2, *header;
4890 	const char *label1, *label2;
4891 
4892 	if (s->id1) {
4893 		err = got_object_id_str(&id_str1, s->id1);
4894 		if (err)
4895 			return err;
4896 		label1 = s->label1 ? s->label1 : id_str1;
4897 	} else
4898 		label1 = "/dev/null";
4899 
4900 	err = got_object_id_str(&id_str2, s->id2);
4901 	if (err)
4902 		return err;
4903 	label2 = s->label2 ? s->label2 : id_str2;
4904 
4905 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4906 		err = got_error_from_errno("asprintf");
4907 		free(id_str1);
4908 		free(id_str2);
4909 		return err;
4910 	}
4911 	free(id_str1);
4912 	free(id_str2);
4913 
4914 	err = draw_file(view, header);
4915 	free(header);
4916 	return err;
4917 }
4918 
4919 static const struct got_error *
4920 set_selected_commit(struct tog_diff_view_state *s,
4921     struct commit_queue_entry *entry)
4922 {
4923 	const struct got_error *err;
4924 	const struct got_object_id_queue *parent_ids;
4925 	struct got_commit_object *selected_commit;
4926 	struct got_object_qid *pid;
4927 
4928 	free(s->id2);
4929 	s->id2 = got_object_id_dup(entry->id);
4930 	if (s->id2 == NULL)
4931 		return got_error_from_errno("got_object_id_dup");
4932 
4933 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4934 	if (err)
4935 		return err;
4936 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4937 	free(s->id1);
4938 	pid = STAILQ_FIRST(parent_ids);
4939 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4940 	got_object_commit_close(selected_commit);
4941 	return NULL;
4942 }
4943 
4944 static const struct got_error *
4945 reset_diff_view(struct tog_view *view)
4946 {
4947 	struct tog_diff_view_state *s = &view->state.diff;
4948 
4949 	view->count = 0;
4950 	wclear(view->window);
4951 	s->first_displayed_line = 1;
4952 	s->last_displayed_line = view->nlines;
4953 	s->matched_line = 0;
4954 	diff_view_indicate_progress(view);
4955 	return create_diff(s);
4956 }
4957 
4958 static void
4959 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4960 {
4961 	int start, i;
4962 
4963 	i = start = s->first_displayed_line - 1;
4964 
4965 	while (s->lines[i].type != type) {
4966 		if (i == 0)
4967 			i = s->nlines - 1;
4968 		if (--i == start)
4969 			return; /* do nothing, requested type not in file */
4970 	}
4971 
4972 	s->selected_line = 1;
4973 	s->first_displayed_line = i;
4974 }
4975 
4976 static void
4977 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4978 {
4979 	int start, i;
4980 
4981 	i = start = s->first_displayed_line + 1;
4982 
4983 	while (s->lines[i].type != type) {
4984 		if (i == s->nlines - 1)
4985 			i = 0;
4986 		if (++i == start)
4987 			return; /* do nothing, requested type not in file */
4988 	}
4989 
4990 	s->selected_line = 1;
4991 	s->first_displayed_line = i;
4992 }
4993 
4994 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4995     int, int, int);
4996 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4997     int, int);
4998 
4999 static const struct got_error *
5000 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5001 {
5002 	const struct got_error *err = NULL;
5003 	struct tog_diff_view_state *s = &view->state.diff;
5004 	struct tog_log_view_state *ls;
5005 	struct commit_queue_entry *old_selected_entry;
5006 	char *line = NULL;
5007 	size_t linesize = 0;
5008 	ssize_t linelen;
5009 	int i, nscroll = view->nlines - 1, up = 0;
5010 
5011 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5012 
5013 	switch (ch) {
5014 	case '0':
5015 		view->x = 0;
5016 		break;
5017 	case '$':
5018 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5019 		view->count = 0;
5020 		break;
5021 	case KEY_RIGHT:
5022 	case 'l':
5023 		if (view->x + view->ncols / 3 < view->maxx)
5024 			view->x += 2;  /* move two columns right */
5025 		else
5026 			view->count = 0;
5027 		break;
5028 	case KEY_LEFT:
5029 	case 'h':
5030 		view->x -= MIN(view->x, 2);  /* move two columns back */
5031 		if (view->x <= 0)
5032 			view->count = 0;
5033 		break;
5034 	case 'a':
5035 	case 'w':
5036 		if (ch == 'a')
5037 			s->force_text_diff = !s->force_text_diff;
5038 		if (ch == 'w')
5039 			s->ignore_whitespace = !s->ignore_whitespace;
5040 		err = reset_diff_view(view);
5041 		break;
5042 	case 'g':
5043 	case KEY_HOME:
5044 		s->first_displayed_line = 1;
5045 		view->count = 0;
5046 		break;
5047 	case 'G':
5048 	case KEY_END:
5049 		view->count = 0;
5050 		if (s->eof)
5051 			break;
5052 
5053 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5054 		s->eof = 1;
5055 		break;
5056 	case 'k':
5057 	case KEY_UP:
5058 	case CTRL('p'):
5059 		if (s->first_displayed_line > 1)
5060 			s->first_displayed_line--;
5061 		else
5062 			view->count = 0;
5063 		break;
5064 	case CTRL('u'):
5065 	case 'u':
5066 		nscroll /= 2;
5067 		/* FALL THROUGH */
5068 	case KEY_PPAGE:
5069 	case CTRL('b'):
5070 	case 'b':
5071 		if (s->first_displayed_line == 1) {
5072 			view->count = 0;
5073 			break;
5074 		}
5075 		i = 0;
5076 		while (i++ < nscroll && s->first_displayed_line > 1)
5077 			s->first_displayed_line--;
5078 		break;
5079 	case 'j':
5080 	case KEY_DOWN:
5081 	case CTRL('n'):
5082 		if (!s->eof)
5083 			s->first_displayed_line++;
5084 		else
5085 			view->count = 0;
5086 		break;
5087 	case CTRL('d'):
5088 	case 'd':
5089 		nscroll /= 2;
5090 		/* FALL THROUGH */
5091 	case KEY_NPAGE:
5092 	case CTRL('f'):
5093 	case 'f':
5094 	case ' ':
5095 		if (s->eof) {
5096 			view->count = 0;
5097 			break;
5098 		}
5099 		i = 0;
5100 		while (!s->eof && i++ < nscroll) {
5101 			linelen = getline(&line, &linesize, s->f);
5102 			s->first_displayed_line++;
5103 			if (linelen == -1) {
5104 				if (feof(s->f)) {
5105 					s->eof = 1;
5106 				} else
5107 					err = got_ferror(s->f, GOT_ERR_IO);
5108 				break;
5109 			}
5110 		}
5111 		free(line);
5112 		break;
5113 	case '(':
5114 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5115 		break;
5116 	case ')':
5117 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5118 		break;
5119 	case '{':
5120 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5121 		break;
5122 	case '}':
5123 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5124 		break;
5125 	case '[':
5126 		if (s->diff_context > 0) {
5127 			s->diff_context--;
5128 			s->matched_line = 0;
5129 			diff_view_indicate_progress(view);
5130 			err = create_diff(s);
5131 			if (s->first_displayed_line + view->nlines - 1 >
5132 			    s->nlines) {
5133 				s->first_displayed_line = 1;
5134 				s->last_displayed_line = view->nlines;
5135 			}
5136 		} else
5137 			view->count = 0;
5138 		break;
5139 	case ']':
5140 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5141 			s->diff_context++;
5142 			s->matched_line = 0;
5143 			diff_view_indicate_progress(view);
5144 			err = create_diff(s);
5145 		} else
5146 			view->count = 0;
5147 		break;
5148 	case '<':
5149 	case ',':
5150 	case 'K':
5151 		up = 1;
5152 		/* FALL THROUGH */
5153 	case '>':
5154 	case '.':
5155 	case 'J':
5156 		if (s->parent_view == NULL) {
5157 			view->count = 0;
5158 			break;
5159 		}
5160 		s->parent_view->count = view->count;
5161 
5162 		if (s->parent_view->type == TOG_VIEW_LOG) {
5163 			ls = &s->parent_view->state.log;
5164 			old_selected_entry = ls->selected_entry;
5165 
5166 			err = input_log_view(NULL, s->parent_view,
5167 			    up ? KEY_UP : KEY_DOWN);
5168 			if (err)
5169 				break;
5170 			view->count = s->parent_view->count;
5171 
5172 			if (old_selected_entry == ls->selected_entry)
5173 				break;
5174 
5175 			err = set_selected_commit(s, ls->selected_entry);
5176 			if (err)
5177 				break;
5178 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5179 			struct tog_blame_view_state *bs;
5180 			struct got_object_id *id, *prev_id;
5181 
5182 			bs = &s->parent_view->state.blame;
5183 			prev_id = get_annotation_for_line(bs->blame.lines,
5184 			    bs->blame.nlines, bs->last_diffed_line);
5185 
5186 			err = input_blame_view(&view, s->parent_view,
5187 			    up ? KEY_UP : KEY_DOWN);
5188 			if (err)
5189 				break;
5190 			view->count = s->parent_view->count;
5191 
5192 			if (prev_id == NULL)
5193 				break;
5194 			id = get_selected_commit_id(bs->blame.lines,
5195 			    bs->blame.nlines, bs->first_displayed_line,
5196 			    bs->selected_line);
5197 			if (id == NULL)
5198 				break;
5199 
5200 			if (!got_object_id_cmp(prev_id, id))
5201 				break;
5202 
5203 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5204 			if (err)
5205 				break;
5206 		}
5207 		s->first_displayed_line = 1;
5208 		s->last_displayed_line = view->nlines;
5209 		s->matched_line = 0;
5210 		view->x = 0;
5211 
5212 		diff_view_indicate_progress(view);
5213 		err = create_diff(s);
5214 		break;
5215 	default:
5216 		view->count = 0;
5217 		break;
5218 	}
5219 
5220 	return err;
5221 }
5222 
5223 static const struct got_error *
5224 cmd_diff(int argc, char *argv[])
5225 {
5226 	const struct got_error *error = NULL;
5227 	struct got_repository *repo = NULL;
5228 	struct got_worktree *worktree = NULL;
5229 	struct got_object_id *id1 = NULL, *id2 = NULL;
5230 	char *repo_path = NULL, *cwd = NULL;
5231 	char *id_str1 = NULL, *id_str2 = NULL;
5232 	char *label1 = NULL, *label2 = NULL;
5233 	int diff_context = 3, ignore_whitespace = 0;
5234 	int ch, force_text_diff = 0;
5235 	const char *errstr;
5236 	struct tog_view *view;
5237 	int *pack_fds = NULL;
5238 
5239 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5240 		switch (ch) {
5241 		case 'a':
5242 			force_text_diff = 1;
5243 			break;
5244 		case 'C':
5245 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5246 			    &errstr);
5247 			if (errstr != NULL)
5248 				errx(1, "number of context lines is %s: %s",
5249 				    errstr, errstr);
5250 			break;
5251 		case 'r':
5252 			repo_path = realpath(optarg, NULL);
5253 			if (repo_path == NULL)
5254 				return got_error_from_errno2("realpath",
5255 				    optarg);
5256 			got_path_strip_trailing_slashes(repo_path);
5257 			break;
5258 		case 'w':
5259 			ignore_whitespace = 1;
5260 			break;
5261 		default:
5262 			usage_diff();
5263 			/* NOTREACHED */
5264 		}
5265 	}
5266 
5267 	argc -= optind;
5268 	argv += optind;
5269 
5270 	if (argc == 0) {
5271 		usage_diff(); /* TODO show local worktree changes */
5272 	} else if (argc == 2) {
5273 		id_str1 = argv[0];
5274 		id_str2 = argv[1];
5275 	} else
5276 		usage_diff();
5277 
5278 	error = got_repo_pack_fds_open(&pack_fds);
5279 	if (error)
5280 		goto done;
5281 
5282 	if (repo_path == NULL) {
5283 		cwd = getcwd(NULL, 0);
5284 		if (cwd == NULL)
5285 			return got_error_from_errno("getcwd");
5286 		error = got_worktree_open(&worktree, cwd);
5287 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5288 			goto done;
5289 		if (worktree)
5290 			repo_path =
5291 			    strdup(got_worktree_get_repo_path(worktree));
5292 		else
5293 			repo_path = strdup(cwd);
5294 		if (repo_path == NULL) {
5295 			error = got_error_from_errno("strdup");
5296 			goto done;
5297 		}
5298 	}
5299 
5300 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5301 	if (error)
5302 		goto done;
5303 
5304 	init_curses();
5305 
5306 	error = apply_unveil(got_repo_get_path(repo), NULL);
5307 	if (error)
5308 		goto done;
5309 
5310 	error = tog_load_refs(repo, 0);
5311 	if (error)
5312 		goto done;
5313 
5314 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5315 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5316 	if (error)
5317 		goto done;
5318 
5319 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5320 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5321 	if (error)
5322 		goto done;
5323 
5324 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5325 	if (view == NULL) {
5326 		error = got_error_from_errno("view_open");
5327 		goto done;
5328 	}
5329 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5330 	    ignore_whitespace, force_text_diff, NULL,  repo);
5331 	if (error)
5332 		goto done;
5333 	error = view_loop(view);
5334 done:
5335 	free(label1);
5336 	free(label2);
5337 	free(repo_path);
5338 	free(cwd);
5339 	if (repo) {
5340 		const struct got_error *close_err = got_repo_close(repo);
5341 		if (error == NULL)
5342 			error = close_err;
5343 	}
5344 	if (worktree)
5345 		got_worktree_close(worktree);
5346 	if (pack_fds) {
5347 		const struct got_error *pack_err =
5348 		    got_repo_pack_fds_close(pack_fds);
5349 		if (error == NULL)
5350 			error = pack_err;
5351 	}
5352 	tog_free_refs();
5353 	return error;
5354 }
5355 
5356 __dead static void
5357 usage_blame(void)
5358 {
5359 	endwin();
5360 	fprintf(stderr,
5361 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5362 	    getprogname());
5363 	exit(1);
5364 }
5365 
5366 struct tog_blame_line {
5367 	int annotated;
5368 	struct got_object_id *id;
5369 };
5370 
5371 static const struct got_error *
5372 draw_blame(struct tog_view *view)
5373 {
5374 	struct tog_blame_view_state *s = &view->state.blame;
5375 	struct tog_blame *blame = &s->blame;
5376 	regmatch_t *regmatch = &view->regmatch;
5377 	const struct got_error *err;
5378 	int lineno = 0, nprinted = 0;
5379 	char *line = NULL;
5380 	size_t linesize = 0;
5381 	ssize_t linelen;
5382 	wchar_t *wline;
5383 	int width;
5384 	struct tog_blame_line *blame_line;
5385 	struct got_object_id *prev_id = NULL;
5386 	char *id_str;
5387 	struct tog_color *tc;
5388 
5389 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5390 	if (err)
5391 		return err;
5392 
5393 	rewind(blame->f);
5394 	werase(view->window);
5395 
5396 	if (asprintf(&line, "commit %s", id_str) == -1) {
5397 		err = got_error_from_errno("asprintf");
5398 		free(id_str);
5399 		return err;
5400 	}
5401 
5402 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5403 	free(line);
5404 	line = NULL;
5405 	if (err)
5406 		return err;
5407 	if (view_needs_focus_indication(view))
5408 		wstandout(view->window);
5409 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5410 	if (tc)
5411 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5412 	waddwstr(view->window, wline);
5413 	while (width++ < view->ncols)
5414 		waddch(view->window, ' ');
5415 	if (tc)
5416 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5417 	if (view_needs_focus_indication(view))
5418 		wstandend(view->window);
5419 	free(wline);
5420 	wline = NULL;
5421 
5422 	if (view->gline > blame->nlines)
5423 		view->gline = blame->nlines;
5424 
5425 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5426 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5427 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5428 		free(id_str);
5429 		return got_error_from_errno("asprintf");
5430 	}
5431 	free(id_str);
5432 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5433 	free(line);
5434 	line = NULL;
5435 	if (err)
5436 		return err;
5437 	waddwstr(view->window, wline);
5438 	free(wline);
5439 	wline = NULL;
5440 	if (width < view->ncols - 1)
5441 		waddch(view->window, '\n');
5442 
5443 	s->eof = 0;
5444 	view->maxx = 0;
5445 	while (nprinted < view->nlines - 2) {
5446 		linelen = getline(&line, &linesize, blame->f);
5447 		if (linelen == -1) {
5448 			if (feof(blame->f)) {
5449 				s->eof = 1;
5450 				break;
5451 			}
5452 			free(line);
5453 			return got_ferror(blame->f, GOT_ERR_IO);
5454 		}
5455 		if (++lineno < s->first_displayed_line)
5456 			continue;
5457 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5458 			continue;
5459 
5460 		/* Set view->maxx based on full line length. */
5461 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5462 		if (err) {
5463 			free(line);
5464 			return err;
5465 		}
5466 		free(wline);
5467 		wline = NULL;
5468 		view->maxx = MAX(view->maxx, width);
5469 
5470 		if (nprinted == s->selected_line - 1)
5471 			wstandout(view->window);
5472 
5473 		if (blame->nlines > 0) {
5474 			blame_line = &blame->lines[lineno - 1];
5475 			if (blame_line->annotated && prev_id &&
5476 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5477 			    !(nprinted == s->selected_line - 1)) {
5478 				waddstr(view->window, "        ");
5479 			} else if (blame_line->annotated) {
5480 				char *id_str;
5481 				err = got_object_id_str(&id_str,
5482 				    blame_line->id);
5483 				if (err) {
5484 					free(line);
5485 					return err;
5486 				}
5487 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5488 				if (tc)
5489 					wattr_on(view->window,
5490 					    COLOR_PAIR(tc->colorpair), NULL);
5491 				wprintw(view->window, "%.8s", id_str);
5492 				if (tc)
5493 					wattr_off(view->window,
5494 					    COLOR_PAIR(tc->colorpair), NULL);
5495 				free(id_str);
5496 				prev_id = blame_line->id;
5497 			} else {
5498 				waddstr(view->window, "........");
5499 				prev_id = NULL;
5500 			}
5501 		} else {
5502 			waddstr(view->window, "........");
5503 			prev_id = NULL;
5504 		}
5505 
5506 		if (nprinted == s->selected_line - 1)
5507 			wstandend(view->window);
5508 		waddstr(view->window, " ");
5509 
5510 		if (view->ncols <= 9) {
5511 			width = 9;
5512 		} else if (s->first_displayed_line + nprinted ==
5513 		    s->matched_line &&
5514 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5515 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5516 			    view->window, view->x, regmatch);
5517 			if (err) {
5518 				free(line);
5519 				return err;
5520 			}
5521 			width += 9;
5522 		} else {
5523 			int skip;
5524 			err = format_line(&wline, &width, &skip, line,
5525 			    view->x, view->ncols - 9, 9, 1);
5526 			if (err) {
5527 				free(line);
5528 				return err;
5529 			}
5530 			waddwstr(view->window, &wline[skip]);
5531 			width += 9;
5532 			free(wline);
5533 			wline = NULL;
5534 		}
5535 
5536 		if (width <= view->ncols - 1)
5537 			waddch(view->window, '\n');
5538 		if (++nprinted == 1)
5539 			s->first_displayed_line = lineno;
5540 	}
5541 	free(line);
5542 	s->last_displayed_line = lineno;
5543 
5544 	view_border(view);
5545 
5546 	return NULL;
5547 }
5548 
5549 static const struct got_error *
5550 blame_cb(void *arg, int nlines, int lineno,
5551     struct got_commit_object *commit, struct got_object_id *id)
5552 {
5553 	const struct got_error *err = NULL;
5554 	struct tog_blame_cb_args *a = arg;
5555 	struct tog_blame_line *line;
5556 	int errcode;
5557 
5558 	if (nlines != a->nlines ||
5559 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5560 		return got_error(GOT_ERR_RANGE);
5561 
5562 	errcode = pthread_mutex_lock(&tog_mutex);
5563 	if (errcode)
5564 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5565 
5566 	if (*a->quit) {	/* user has quit the blame view */
5567 		err = got_error(GOT_ERR_ITER_COMPLETED);
5568 		goto done;
5569 	}
5570 
5571 	if (lineno == -1)
5572 		goto done; /* no change in this commit */
5573 
5574 	line = &a->lines[lineno - 1];
5575 	if (line->annotated)
5576 		goto done;
5577 
5578 	line->id = got_object_id_dup(id);
5579 	if (line->id == NULL) {
5580 		err = got_error_from_errno("got_object_id_dup");
5581 		goto done;
5582 	}
5583 	line->annotated = 1;
5584 done:
5585 	errcode = pthread_mutex_unlock(&tog_mutex);
5586 	if (errcode)
5587 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5588 	return err;
5589 }
5590 
5591 static void *
5592 blame_thread(void *arg)
5593 {
5594 	const struct got_error *err, *close_err;
5595 	struct tog_blame_thread_args *ta = arg;
5596 	struct tog_blame_cb_args *a = ta->cb_args;
5597 	int errcode, fd1 = -1, fd2 = -1;
5598 	FILE *f1 = NULL, *f2 = NULL;
5599 
5600 	fd1 = got_opentempfd();
5601 	if (fd1 == -1)
5602 		return (void *)got_error_from_errno("got_opentempfd");
5603 
5604 	fd2 = got_opentempfd();
5605 	if (fd2 == -1) {
5606 		err = got_error_from_errno("got_opentempfd");
5607 		goto done;
5608 	}
5609 
5610 	f1 = got_opentemp();
5611 	if (f1 == NULL) {
5612 		err = (void *)got_error_from_errno("got_opentemp");
5613 		goto done;
5614 	}
5615 	f2 = got_opentemp();
5616 	if (f2 == NULL) {
5617 		err = (void *)got_error_from_errno("got_opentemp");
5618 		goto done;
5619 	}
5620 
5621 	err = block_signals_used_by_main_thread();
5622 	if (err)
5623 		goto done;
5624 
5625 	err = got_blame(ta->path, a->commit_id, ta->repo,
5626 	    tog_diff_algo, blame_cb, ta->cb_args,
5627 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5628 	if (err && err->code == GOT_ERR_CANCELLED)
5629 		err = NULL;
5630 
5631 	errcode = pthread_mutex_lock(&tog_mutex);
5632 	if (errcode) {
5633 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5634 		goto done;
5635 	}
5636 
5637 	close_err = got_repo_close(ta->repo);
5638 	if (err == NULL)
5639 		err = close_err;
5640 	ta->repo = NULL;
5641 	*ta->complete = 1;
5642 
5643 	errcode = pthread_mutex_unlock(&tog_mutex);
5644 	if (errcode && err == NULL)
5645 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5646 
5647 done:
5648 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5649 		err = got_error_from_errno("close");
5650 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5651 		err = got_error_from_errno("close");
5652 	if (f1 && fclose(f1) == EOF && err == NULL)
5653 		err = got_error_from_errno("fclose");
5654 	if (f2 && fclose(f2) == EOF && err == NULL)
5655 		err = got_error_from_errno("fclose");
5656 
5657 	return (void *)err;
5658 }
5659 
5660 static struct got_object_id *
5661 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5662     int first_displayed_line, int selected_line)
5663 {
5664 	struct tog_blame_line *line;
5665 
5666 	if (nlines <= 0)
5667 		return NULL;
5668 
5669 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5670 	if (!line->annotated)
5671 		return NULL;
5672 
5673 	return line->id;
5674 }
5675 
5676 static struct got_object_id *
5677 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5678     int lineno)
5679 {
5680 	struct tog_blame_line *line;
5681 
5682 	if (nlines <= 0 || lineno >= nlines)
5683 		return NULL;
5684 
5685 	line = &lines[lineno - 1];
5686 	if (!line->annotated)
5687 		return NULL;
5688 
5689 	return line->id;
5690 }
5691 
5692 static const struct got_error *
5693 stop_blame(struct tog_blame *blame)
5694 {
5695 	const struct got_error *err = NULL;
5696 	int i;
5697 
5698 	if (blame->thread) {
5699 		int errcode;
5700 		errcode = pthread_mutex_unlock(&tog_mutex);
5701 		if (errcode)
5702 			return got_error_set_errno(errcode,
5703 			    "pthread_mutex_unlock");
5704 		errcode = pthread_join(blame->thread, (void **)&err);
5705 		if (errcode)
5706 			return got_error_set_errno(errcode, "pthread_join");
5707 		errcode = pthread_mutex_lock(&tog_mutex);
5708 		if (errcode)
5709 			return got_error_set_errno(errcode,
5710 			    "pthread_mutex_lock");
5711 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5712 			err = NULL;
5713 		blame->thread = NULL;
5714 	}
5715 	if (blame->thread_args.repo) {
5716 		const struct got_error *close_err;
5717 		close_err = got_repo_close(blame->thread_args.repo);
5718 		if (err == NULL)
5719 			err = close_err;
5720 		blame->thread_args.repo = NULL;
5721 	}
5722 	if (blame->f) {
5723 		if (fclose(blame->f) == EOF && err == NULL)
5724 			err = got_error_from_errno("fclose");
5725 		blame->f = NULL;
5726 	}
5727 	if (blame->lines) {
5728 		for (i = 0; i < blame->nlines; i++)
5729 			free(blame->lines[i].id);
5730 		free(blame->lines);
5731 		blame->lines = NULL;
5732 	}
5733 	free(blame->cb_args.commit_id);
5734 	blame->cb_args.commit_id = NULL;
5735 	if (blame->pack_fds) {
5736 		const struct got_error *pack_err =
5737 		    got_repo_pack_fds_close(blame->pack_fds);
5738 		if (err == NULL)
5739 			err = pack_err;
5740 		blame->pack_fds = NULL;
5741 	}
5742 	return err;
5743 }
5744 
5745 static const struct got_error *
5746 cancel_blame_view(void *arg)
5747 {
5748 	const struct got_error *err = NULL;
5749 	int *done = arg;
5750 	int errcode;
5751 
5752 	errcode = pthread_mutex_lock(&tog_mutex);
5753 	if (errcode)
5754 		return got_error_set_errno(errcode,
5755 		    "pthread_mutex_unlock");
5756 
5757 	if (*done)
5758 		err = got_error(GOT_ERR_CANCELLED);
5759 
5760 	errcode = pthread_mutex_unlock(&tog_mutex);
5761 	if (errcode)
5762 		return got_error_set_errno(errcode,
5763 		    "pthread_mutex_lock");
5764 
5765 	return err;
5766 }
5767 
5768 static const struct got_error *
5769 run_blame(struct tog_view *view)
5770 {
5771 	struct tog_blame_view_state *s = &view->state.blame;
5772 	struct tog_blame *blame = &s->blame;
5773 	const struct got_error *err = NULL;
5774 	struct got_commit_object *commit = NULL;
5775 	struct got_blob_object *blob = NULL;
5776 	struct got_repository *thread_repo = NULL;
5777 	struct got_object_id *obj_id = NULL;
5778 	int obj_type, fd = -1;
5779 	int *pack_fds = NULL;
5780 
5781 	err = got_object_open_as_commit(&commit, s->repo,
5782 	    &s->blamed_commit->id);
5783 	if (err)
5784 		return err;
5785 
5786 	fd = got_opentempfd();
5787 	if (fd == -1) {
5788 		err = got_error_from_errno("got_opentempfd");
5789 		goto done;
5790 	}
5791 
5792 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5793 	if (err)
5794 		goto done;
5795 
5796 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5797 	if (err)
5798 		goto done;
5799 
5800 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5801 		err = got_error(GOT_ERR_OBJ_TYPE);
5802 		goto done;
5803 	}
5804 
5805 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5806 	if (err)
5807 		goto done;
5808 	blame->f = got_opentemp();
5809 	if (blame->f == NULL) {
5810 		err = got_error_from_errno("got_opentemp");
5811 		goto done;
5812 	}
5813 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5814 	    &blame->line_offsets, blame->f, blob);
5815 	if (err)
5816 		goto done;
5817 	if (blame->nlines == 0) {
5818 		s->blame_complete = 1;
5819 		goto done;
5820 	}
5821 
5822 	/* Don't include \n at EOF in the blame line count. */
5823 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5824 		blame->nlines--;
5825 
5826 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5827 	if (blame->lines == NULL) {
5828 		err = got_error_from_errno("calloc");
5829 		goto done;
5830 	}
5831 
5832 	err = got_repo_pack_fds_open(&pack_fds);
5833 	if (err)
5834 		goto done;
5835 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5836 	    pack_fds);
5837 	if (err)
5838 		goto done;
5839 
5840 	blame->pack_fds = pack_fds;
5841 	blame->cb_args.view = view;
5842 	blame->cb_args.lines = blame->lines;
5843 	blame->cb_args.nlines = blame->nlines;
5844 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5845 	if (blame->cb_args.commit_id == NULL) {
5846 		err = got_error_from_errno("got_object_id_dup");
5847 		goto done;
5848 	}
5849 	blame->cb_args.quit = &s->done;
5850 
5851 	blame->thread_args.path = s->path;
5852 	blame->thread_args.repo = thread_repo;
5853 	blame->thread_args.cb_args = &blame->cb_args;
5854 	blame->thread_args.complete = &s->blame_complete;
5855 	blame->thread_args.cancel_cb = cancel_blame_view;
5856 	blame->thread_args.cancel_arg = &s->done;
5857 	s->blame_complete = 0;
5858 
5859 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5860 		s->first_displayed_line = 1;
5861 		s->last_displayed_line = view->nlines;
5862 		s->selected_line = 1;
5863 	}
5864 	s->matched_line = 0;
5865 
5866 done:
5867 	if (commit)
5868 		got_object_commit_close(commit);
5869 	if (fd != -1 && close(fd) == -1 && err == NULL)
5870 		err = got_error_from_errno("close");
5871 	if (blob)
5872 		got_object_blob_close(blob);
5873 	free(obj_id);
5874 	if (err)
5875 		stop_blame(blame);
5876 	return err;
5877 }
5878 
5879 static const struct got_error *
5880 open_blame_view(struct tog_view *view, char *path,
5881     struct got_object_id *commit_id, struct got_repository *repo)
5882 {
5883 	const struct got_error *err = NULL;
5884 	struct tog_blame_view_state *s = &view->state.blame;
5885 
5886 	STAILQ_INIT(&s->blamed_commits);
5887 
5888 	s->path = strdup(path);
5889 	if (s->path == NULL)
5890 		return got_error_from_errno("strdup");
5891 
5892 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5893 	if (err) {
5894 		free(s->path);
5895 		return err;
5896 	}
5897 
5898 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5899 	s->first_displayed_line = 1;
5900 	s->last_displayed_line = view->nlines;
5901 	s->selected_line = 1;
5902 	s->blame_complete = 0;
5903 	s->repo = repo;
5904 	s->commit_id = commit_id;
5905 	memset(&s->blame, 0, sizeof(s->blame));
5906 
5907 	STAILQ_INIT(&s->colors);
5908 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5909 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5910 		    get_color_value("TOG_COLOR_COMMIT"));
5911 		if (err)
5912 			return err;
5913 	}
5914 
5915 	view->show = show_blame_view;
5916 	view->input = input_blame_view;
5917 	view->reset = reset_blame_view;
5918 	view->close = close_blame_view;
5919 	view->search_start = search_start_blame_view;
5920 	view->search_next = search_next_blame_view;
5921 
5922 	return run_blame(view);
5923 }
5924 
5925 static const struct got_error *
5926 close_blame_view(struct tog_view *view)
5927 {
5928 	const struct got_error *err = NULL;
5929 	struct tog_blame_view_state *s = &view->state.blame;
5930 
5931 	if (s->blame.thread)
5932 		err = stop_blame(&s->blame);
5933 
5934 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5935 		struct got_object_qid *blamed_commit;
5936 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5937 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5938 		got_object_qid_free(blamed_commit);
5939 	}
5940 
5941 	free(s->path);
5942 	free_colors(&s->colors);
5943 	return err;
5944 }
5945 
5946 static const struct got_error *
5947 search_start_blame_view(struct tog_view *view)
5948 {
5949 	struct tog_blame_view_state *s = &view->state.blame;
5950 
5951 	s->matched_line = 0;
5952 	return NULL;
5953 }
5954 
5955 static const struct got_error *
5956 search_next_blame_view(struct tog_view *view)
5957 {
5958 	struct tog_blame_view_state *s = &view->state.blame;
5959 	const struct got_error *err = NULL;
5960 	int lineno;
5961 	char *line = NULL;
5962 	size_t linesize = 0;
5963 	ssize_t linelen;
5964 
5965 	if (!view->searching) {
5966 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5967 		return NULL;
5968 	}
5969 
5970 	if (s->matched_line) {
5971 		if (view->searching == TOG_SEARCH_FORWARD)
5972 			lineno = s->matched_line + 1;
5973 		else
5974 			lineno = s->matched_line - 1;
5975 	} else
5976 		lineno = s->first_displayed_line - 1 + s->selected_line;
5977 
5978 	while (1) {
5979 		off_t offset;
5980 
5981 		if (lineno <= 0 || lineno > s->blame.nlines) {
5982 			if (s->matched_line == 0) {
5983 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5984 				break;
5985 			}
5986 
5987 			if (view->searching == TOG_SEARCH_FORWARD)
5988 				lineno = 1;
5989 			else
5990 				lineno = s->blame.nlines;
5991 		}
5992 
5993 		offset = s->blame.line_offsets[lineno - 1];
5994 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5995 			free(line);
5996 			return got_error_from_errno("fseeko");
5997 		}
5998 		linelen = getline(&line, &linesize, s->blame.f);
5999 		if (linelen != -1) {
6000 			char *exstr;
6001 			err = expand_tab(&exstr, line);
6002 			if (err)
6003 				break;
6004 			if (match_line(exstr, &view->regex, 1,
6005 			    &view->regmatch)) {
6006 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6007 				s->matched_line = lineno;
6008 				free(exstr);
6009 				break;
6010 			}
6011 			free(exstr);
6012 		}
6013 		if (view->searching == TOG_SEARCH_FORWARD)
6014 			lineno++;
6015 		else
6016 			lineno--;
6017 	}
6018 	free(line);
6019 
6020 	if (s->matched_line) {
6021 		s->first_displayed_line = s->matched_line;
6022 		s->selected_line = 1;
6023 	}
6024 
6025 	return err;
6026 }
6027 
6028 static const struct got_error *
6029 show_blame_view(struct tog_view *view)
6030 {
6031 	const struct got_error *err = NULL;
6032 	struct tog_blame_view_state *s = &view->state.blame;
6033 	int errcode;
6034 
6035 	if (s->blame.thread == NULL && !s->blame_complete) {
6036 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6037 		    &s->blame.thread_args);
6038 		if (errcode)
6039 			return got_error_set_errno(errcode, "pthread_create");
6040 
6041 		halfdelay(1); /* fast refresh while annotating  */
6042 	}
6043 
6044 	if (s->blame_complete)
6045 		halfdelay(10); /* disable fast refresh */
6046 
6047 	err = draw_blame(view);
6048 
6049 	view_border(view);
6050 	return err;
6051 }
6052 
6053 static const struct got_error *
6054 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6055     struct got_repository *repo, struct got_object_id *id)
6056 {
6057 	struct tog_view		*log_view;
6058 	const struct got_error	*err = NULL;
6059 
6060 	*new_view = NULL;
6061 
6062 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6063 	if (log_view == NULL)
6064 		return got_error_from_errno("view_open");
6065 
6066 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6067 	if (err)
6068 		view_close(log_view);
6069 	else
6070 		*new_view = log_view;
6071 
6072 	return err;
6073 }
6074 
6075 static const struct got_error *
6076 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6077 {
6078 	const struct got_error *err = NULL, *thread_err = NULL;
6079 	struct tog_view *diff_view;
6080 	struct tog_blame_view_state *s = &view->state.blame;
6081 	int eos, nscroll, begin_y = 0, begin_x = 0;
6082 
6083 	eos = nscroll = view->nlines - 2;
6084 	if (view_is_hsplit_top(view))
6085 		--eos;  /* border */
6086 
6087 	switch (ch) {
6088 	case '0':
6089 		view->x = 0;
6090 		break;
6091 	case '$':
6092 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6093 		view->count = 0;
6094 		break;
6095 	case KEY_RIGHT:
6096 	case 'l':
6097 		if (view->x + view->ncols / 3 < view->maxx)
6098 			view->x += 2;  /* move two columns right */
6099 		else
6100 			view->count = 0;
6101 		break;
6102 	case KEY_LEFT:
6103 	case 'h':
6104 		view->x -= MIN(view->x, 2);  /* move two columns back */
6105 		if (view->x <= 0)
6106 			view->count = 0;
6107 		break;
6108 	case 'q':
6109 		s->done = 1;
6110 		break;
6111 	case 'g':
6112 	case KEY_HOME:
6113 		s->selected_line = 1;
6114 		s->first_displayed_line = 1;
6115 		view->count = 0;
6116 		break;
6117 	case 'G':
6118 	case KEY_END:
6119 		if (s->blame.nlines < eos) {
6120 			s->selected_line = s->blame.nlines;
6121 			s->first_displayed_line = 1;
6122 		} else {
6123 			s->selected_line = eos;
6124 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6125 		}
6126 		view->count = 0;
6127 		break;
6128 	case 'k':
6129 	case KEY_UP:
6130 	case CTRL('p'):
6131 		if (s->selected_line > 1)
6132 			s->selected_line--;
6133 		else if (s->selected_line == 1 &&
6134 		    s->first_displayed_line > 1)
6135 			s->first_displayed_line--;
6136 		else
6137 			view->count = 0;
6138 		break;
6139 	case CTRL('u'):
6140 	case 'u':
6141 		nscroll /= 2;
6142 		/* FALL THROUGH */
6143 	case KEY_PPAGE:
6144 	case CTRL('b'):
6145 	case 'b':
6146 		if (s->first_displayed_line == 1) {
6147 			if (view->count > 1)
6148 				nscroll += nscroll;
6149 			s->selected_line = MAX(1, s->selected_line - nscroll);
6150 			view->count = 0;
6151 			break;
6152 		}
6153 		if (s->first_displayed_line > nscroll)
6154 			s->first_displayed_line -= nscroll;
6155 		else
6156 			s->first_displayed_line = 1;
6157 		break;
6158 	case 'j':
6159 	case KEY_DOWN:
6160 	case CTRL('n'):
6161 		if (s->selected_line < eos && s->first_displayed_line +
6162 		    s->selected_line <= s->blame.nlines)
6163 			s->selected_line++;
6164 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6165 			s->first_displayed_line++;
6166 		else
6167 			view->count = 0;
6168 		break;
6169 	case 'c':
6170 	case 'p': {
6171 		struct got_object_id *id = NULL;
6172 
6173 		view->count = 0;
6174 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6175 		    s->first_displayed_line, s->selected_line);
6176 		if (id == NULL)
6177 			break;
6178 		if (ch == 'p') {
6179 			struct got_commit_object *commit, *pcommit;
6180 			struct got_object_qid *pid;
6181 			struct got_object_id *blob_id = NULL;
6182 			int obj_type;
6183 			err = got_object_open_as_commit(&commit,
6184 			    s->repo, id);
6185 			if (err)
6186 				break;
6187 			pid = STAILQ_FIRST(
6188 			    got_object_commit_get_parent_ids(commit));
6189 			if (pid == NULL) {
6190 				got_object_commit_close(commit);
6191 				break;
6192 			}
6193 			/* Check if path history ends here. */
6194 			err = got_object_open_as_commit(&pcommit,
6195 			    s->repo, &pid->id);
6196 			if (err)
6197 				break;
6198 			err = got_object_id_by_path(&blob_id, s->repo,
6199 			    pcommit, s->path);
6200 			got_object_commit_close(pcommit);
6201 			if (err) {
6202 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6203 					err = NULL;
6204 				got_object_commit_close(commit);
6205 				break;
6206 			}
6207 			err = got_object_get_type(&obj_type, s->repo,
6208 			    blob_id);
6209 			free(blob_id);
6210 			/* Can't blame non-blob type objects. */
6211 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6212 				got_object_commit_close(commit);
6213 				break;
6214 			}
6215 			err = got_object_qid_alloc(&s->blamed_commit,
6216 			    &pid->id);
6217 			got_object_commit_close(commit);
6218 		} else {
6219 			if (got_object_id_cmp(id,
6220 			    &s->blamed_commit->id) == 0)
6221 				break;
6222 			err = got_object_qid_alloc(&s->blamed_commit,
6223 			    id);
6224 		}
6225 		if (err)
6226 			break;
6227 		s->done = 1;
6228 		thread_err = stop_blame(&s->blame);
6229 		s->done = 0;
6230 		if (thread_err)
6231 			break;
6232 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6233 		    s->blamed_commit, entry);
6234 		err = run_blame(view);
6235 		if (err)
6236 			break;
6237 		break;
6238 	}
6239 	case 'C': {
6240 		struct got_object_qid *first;
6241 
6242 		view->count = 0;
6243 		first = STAILQ_FIRST(&s->blamed_commits);
6244 		if (!got_object_id_cmp(&first->id, s->commit_id))
6245 			break;
6246 		s->done = 1;
6247 		thread_err = stop_blame(&s->blame);
6248 		s->done = 0;
6249 		if (thread_err)
6250 			break;
6251 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6252 		got_object_qid_free(s->blamed_commit);
6253 		s->blamed_commit =
6254 		    STAILQ_FIRST(&s->blamed_commits);
6255 		err = run_blame(view);
6256 		if (err)
6257 			break;
6258 		break;
6259 	}
6260 	case 'L':
6261 		view->count = 0;
6262 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6263 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6264 		if (s->id_to_log)
6265 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6266 		break;
6267 	case KEY_ENTER:
6268 	case '\r': {
6269 		struct got_object_id *id = NULL;
6270 		struct got_object_qid *pid;
6271 		struct got_commit_object *commit = NULL;
6272 
6273 		view->count = 0;
6274 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6275 		    s->first_displayed_line, s->selected_line);
6276 		if (id == NULL)
6277 			break;
6278 		err = got_object_open_as_commit(&commit, s->repo, id);
6279 		if (err)
6280 			break;
6281 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6282 		if (*new_view) {
6283 			/* traversed from diff view, release diff resources  */
6284 			err = close_diff_view(*new_view);
6285 			if (err)
6286 				break;
6287 			diff_view = *new_view;
6288 		} else {
6289 			if (view_is_parent_view(view))
6290 				view_get_split(view, &begin_y, &begin_x);
6291 
6292 			diff_view = view_open(0, 0, begin_y, begin_x,
6293 			    TOG_VIEW_DIFF);
6294 			if (diff_view == NULL) {
6295 				got_object_commit_close(commit);
6296 				err = got_error_from_errno("view_open");
6297 				break;
6298 			}
6299 		}
6300 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6301 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6302 		got_object_commit_close(commit);
6303 		if (err) {
6304 			view_close(diff_view);
6305 			break;
6306 		}
6307 		s->last_diffed_line = s->first_displayed_line - 1 +
6308 		    s->selected_line;
6309 		if (*new_view)
6310 			break;	/* still open from active diff view */
6311 		if (view_is_parent_view(view) &&
6312 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6313 			err = view_init_hsplit(view, begin_y);
6314 			if (err)
6315 				break;
6316 		}
6317 
6318 		view->focussed = 0;
6319 		diff_view->focussed = 1;
6320 		diff_view->mode = view->mode;
6321 		diff_view->nlines = view->lines - begin_y;
6322 		if (view_is_parent_view(view)) {
6323 			view_transfer_size(diff_view, view);
6324 			err = view_close_child(view);
6325 			if (err)
6326 				break;
6327 			err = view_set_child(view, diff_view);
6328 			if (err)
6329 				break;
6330 			view->focus_child = 1;
6331 		} else
6332 			*new_view = diff_view;
6333 		if (err)
6334 			break;
6335 		break;
6336 	}
6337 	case CTRL('d'):
6338 	case 'd':
6339 		nscroll /= 2;
6340 		/* FALL THROUGH */
6341 	case KEY_NPAGE:
6342 	case CTRL('f'):
6343 	case 'f':
6344 	case ' ':
6345 		if (s->last_displayed_line >= s->blame.nlines &&
6346 		    s->selected_line >= MIN(s->blame.nlines,
6347 		    view->nlines - 2)) {
6348 			view->count = 0;
6349 			break;
6350 		}
6351 		if (s->last_displayed_line >= s->blame.nlines &&
6352 		    s->selected_line < view->nlines - 2) {
6353 			s->selected_line +=
6354 			    MIN(nscroll, s->last_displayed_line -
6355 			    s->first_displayed_line - s->selected_line + 1);
6356 		}
6357 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6358 			s->first_displayed_line += nscroll;
6359 		else
6360 			s->first_displayed_line =
6361 			    s->blame.nlines - (view->nlines - 3);
6362 		break;
6363 	case KEY_RESIZE:
6364 		if (s->selected_line > view->nlines - 2) {
6365 			s->selected_line = MIN(s->blame.nlines,
6366 			    view->nlines - 2);
6367 		}
6368 		break;
6369 	default:
6370 		view->count = 0;
6371 		break;
6372 	}
6373 	return thread_err ? thread_err : err;
6374 }
6375 
6376 static const struct got_error *
6377 reset_blame_view(struct tog_view *view)
6378 {
6379 	const struct got_error *err;
6380 	struct tog_blame_view_state *s = &view->state.blame;
6381 
6382 	view->count = 0;
6383 	s->done = 1;
6384 	err = stop_blame(&s->blame);
6385 	s->done = 0;
6386 	if (err)
6387 		return err;
6388 	return run_blame(view);
6389 }
6390 
6391 static const struct got_error *
6392 cmd_blame(int argc, char *argv[])
6393 {
6394 	const struct got_error *error;
6395 	struct got_repository *repo = NULL;
6396 	struct got_worktree *worktree = NULL;
6397 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6398 	char *link_target = NULL;
6399 	struct got_object_id *commit_id = NULL;
6400 	struct got_commit_object *commit = NULL;
6401 	char *commit_id_str = NULL;
6402 	int ch;
6403 	struct tog_view *view;
6404 	int *pack_fds = NULL;
6405 
6406 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6407 		switch (ch) {
6408 		case 'c':
6409 			commit_id_str = optarg;
6410 			break;
6411 		case 'r':
6412 			repo_path = realpath(optarg, NULL);
6413 			if (repo_path == NULL)
6414 				return got_error_from_errno2("realpath",
6415 				    optarg);
6416 			break;
6417 		default:
6418 			usage_blame();
6419 			/* NOTREACHED */
6420 		}
6421 	}
6422 
6423 	argc -= optind;
6424 	argv += optind;
6425 
6426 	if (argc != 1)
6427 		usage_blame();
6428 
6429 	error = got_repo_pack_fds_open(&pack_fds);
6430 	if (error != NULL)
6431 		goto done;
6432 
6433 	if (repo_path == NULL) {
6434 		cwd = getcwd(NULL, 0);
6435 		if (cwd == NULL)
6436 			return got_error_from_errno("getcwd");
6437 		error = got_worktree_open(&worktree, cwd);
6438 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6439 			goto done;
6440 		if (worktree)
6441 			repo_path =
6442 			    strdup(got_worktree_get_repo_path(worktree));
6443 		else
6444 			repo_path = strdup(cwd);
6445 		if (repo_path == NULL) {
6446 			error = got_error_from_errno("strdup");
6447 			goto done;
6448 		}
6449 	}
6450 
6451 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6452 	if (error != NULL)
6453 		goto done;
6454 
6455 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6456 	    worktree);
6457 	if (error)
6458 		goto done;
6459 
6460 	init_curses();
6461 
6462 	error = apply_unveil(got_repo_get_path(repo), NULL);
6463 	if (error)
6464 		goto done;
6465 
6466 	error = tog_load_refs(repo, 0);
6467 	if (error)
6468 		goto done;
6469 
6470 	if (commit_id_str == NULL) {
6471 		struct got_reference *head_ref;
6472 		error = got_ref_open(&head_ref, repo, worktree ?
6473 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6474 		if (error != NULL)
6475 			goto done;
6476 		error = got_ref_resolve(&commit_id, repo, head_ref);
6477 		got_ref_close(head_ref);
6478 	} else {
6479 		error = got_repo_match_object_id(&commit_id, NULL,
6480 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6481 	}
6482 	if (error != NULL)
6483 		goto done;
6484 
6485 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6486 	if (view == NULL) {
6487 		error = got_error_from_errno("view_open");
6488 		goto done;
6489 	}
6490 
6491 	error = got_object_open_as_commit(&commit, repo, commit_id);
6492 	if (error)
6493 		goto done;
6494 
6495 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6496 	    commit, repo);
6497 	if (error)
6498 		goto done;
6499 
6500 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6501 	    commit_id, repo);
6502 	if (error)
6503 		goto done;
6504 	if (worktree) {
6505 		/* Release work tree lock. */
6506 		got_worktree_close(worktree);
6507 		worktree = NULL;
6508 	}
6509 	error = view_loop(view);
6510 done:
6511 	free(repo_path);
6512 	free(in_repo_path);
6513 	free(link_target);
6514 	free(cwd);
6515 	free(commit_id);
6516 	if (commit)
6517 		got_object_commit_close(commit);
6518 	if (worktree)
6519 		got_worktree_close(worktree);
6520 	if (repo) {
6521 		const struct got_error *close_err = got_repo_close(repo);
6522 		if (error == NULL)
6523 			error = close_err;
6524 	}
6525 	if (pack_fds) {
6526 		const struct got_error *pack_err =
6527 		    got_repo_pack_fds_close(pack_fds);
6528 		if (error == NULL)
6529 			error = pack_err;
6530 	}
6531 	tog_free_refs();
6532 	return error;
6533 }
6534 
6535 static const struct got_error *
6536 draw_tree_entries(struct tog_view *view, const char *parent_path)
6537 {
6538 	struct tog_tree_view_state *s = &view->state.tree;
6539 	const struct got_error *err = NULL;
6540 	struct got_tree_entry *te;
6541 	wchar_t *wline;
6542 	char *index = NULL;
6543 	struct tog_color *tc;
6544 	int width, n, nentries, i = 1;
6545 	int limit = view->nlines;
6546 
6547 	s->ndisplayed = 0;
6548 	if (view_is_hsplit_top(view))
6549 		--limit;  /* border */
6550 
6551 	werase(view->window);
6552 
6553 	if (limit == 0)
6554 		return NULL;
6555 
6556 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6557 	    0, 0);
6558 	if (err)
6559 		return err;
6560 	if (view_needs_focus_indication(view))
6561 		wstandout(view->window);
6562 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6563 	if (tc)
6564 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6565 	waddwstr(view->window, wline);
6566 	free(wline);
6567 	wline = NULL;
6568 	while (width++ < view->ncols)
6569 		waddch(view->window, ' ');
6570 	if (tc)
6571 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6572 	if (view_needs_focus_indication(view))
6573 		wstandend(view->window);
6574 	if (--limit <= 0)
6575 		return NULL;
6576 
6577 	i += s->selected;
6578 	if (s->first_displayed_entry) {
6579 		i += got_tree_entry_get_index(s->first_displayed_entry);
6580 		if (s->tree != s->root)
6581 			++i;  /* account for ".." entry */
6582 	}
6583 	nentries = got_object_tree_get_nentries(s->tree);
6584 	if (asprintf(&index, "[%d/%d] %s",
6585 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6586 		return got_error_from_errno("asprintf");
6587 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6588 	free(index);
6589 	if (err)
6590 		return err;
6591 	waddwstr(view->window, wline);
6592 	free(wline);
6593 	wline = NULL;
6594 	if (width < view->ncols - 1)
6595 		waddch(view->window, '\n');
6596 	if (--limit <= 0)
6597 		return NULL;
6598 	waddch(view->window, '\n');
6599 	if (--limit <= 0)
6600 		return NULL;
6601 
6602 	if (s->first_displayed_entry == NULL) {
6603 		te = got_object_tree_get_first_entry(s->tree);
6604 		if (s->selected == 0) {
6605 			if (view->focussed)
6606 				wstandout(view->window);
6607 			s->selected_entry = NULL;
6608 		}
6609 		waddstr(view->window, "  ..\n");	/* parent directory */
6610 		if (s->selected == 0 && view->focussed)
6611 			wstandend(view->window);
6612 		s->ndisplayed++;
6613 		if (--limit <= 0)
6614 			return NULL;
6615 		n = 1;
6616 	} else {
6617 		n = 0;
6618 		te = s->first_displayed_entry;
6619 	}
6620 
6621 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6622 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6623 		const char *modestr = "";
6624 		mode_t mode;
6625 
6626 		te = got_object_tree_get_entry(s->tree, i);
6627 		mode = got_tree_entry_get_mode(te);
6628 
6629 		if (s->show_ids) {
6630 			err = got_object_id_str(&id_str,
6631 			    got_tree_entry_get_id(te));
6632 			if (err)
6633 				return got_error_from_errno(
6634 				    "got_object_id_str");
6635 		}
6636 		if (got_object_tree_entry_is_submodule(te))
6637 			modestr = "$";
6638 		else if (S_ISLNK(mode)) {
6639 			int i;
6640 
6641 			err = got_tree_entry_get_symlink_target(&link_target,
6642 			    te, s->repo);
6643 			if (err) {
6644 				free(id_str);
6645 				return err;
6646 			}
6647 			for (i = 0; i < strlen(link_target); i++) {
6648 				if (!isprint((unsigned char)link_target[i]))
6649 					link_target[i] = '?';
6650 			}
6651 			modestr = "@";
6652 		}
6653 		else if (S_ISDIR(mode))
6654 			modestr = "/";
6655 		else if (mode & S_IXUSR)
6656 			modestr = "*";
6657 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6658 		    got_tree_entry_get_name(te), modestr,
6659 		    link_target ? " -> ": "",
6660 		    link_target ? link_target : "") == -1) {
6661 			free(id_str);
6662 			free(link_target);
6663 			return got_error_from_errno("asprintf");
6664 		}
6665 		free(id_str);
6666 		free(link_target);
6667 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6668 		    0, 0);
6669 		if (err) {
6670 			free(line);
6671 			break;
6672 		}
6673 		if (n == s->selected) {
6674 			if (view->focussed)
6675 				wstandout(view->window);
6676 			s->selected_entry = te;
6677 		}
6678 		tc = match_color(&s->colors, line);
6679 		if (tc)
6680 			wattr_on(view->window,
6681 			    COLOR_PAIR(tc->colorpair), NULL);
6682 		waddwstr(view->window, wline);
6683 		if (tc)
6684 			wattr_off(view->window,
6685 			    COLOR_PAIR(tc->colorpair), NULL);
6686 		if (width < view->ncols - 1)
6687 			waddch(view->window, '\n');
6688 		if (n == s->selected && view->focussed)
6689 			wstandend(view->window);
6690 		free(line);
6691 		free(wline);
6692 		wline = NULL;
6693 		n++;
6694 		s->ndisplayed++;
6695 		s->last_displayed_entry = te;
6696 		if (--limit <= 0)
6697 			break;
6698 	}
6699 
6700 	return err;
6701 }
6702 
6703 static void
6704 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6705 {
6706 	struct got_tree_entry *te;
6707 	int isroot = s->tree == s->root;
6708 	int i = 0;
6709 
6710 	if (s->first_displayed_entry == NULL)
6711 		return;
6712 
6713 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6714 	while (i++ < maxscroll) {
6715 		if (te == NULL) {
6716 			if (!isroot)
6717 				s->first_displayed_entry = NULL;
6718 			break;
6719 		}
6720 		s->first_displayed_entry = te;
6721 		te = got_tree_entry_get_prev(s->tree, te);
6722 	}
6723 }
6724 
6725 static const struct got_error *
6726 tree_scroll_down(struct tog_view *view, int maxscroll)
6727 {
6728 	struct tog_tree_view_state *s = &view->state.tree;
6729 	struct got_tree_entry *next, *last;
6730 	int n = 0;
6731 
6732 	if (s->first_displayed_entry)
6733 		next = got_tree_entry_get_next(s->tree,
6734 		    s->first_displayed_entry);
6735 	else
6736 		next = got_object_tree_get_first_entry(s->tree);
6737 
6738 	last = s->last_displayed_entry;
6739 	while (next && n++ < maxscroll) {
6740 		if (last) {
6741 			s->last_displayed_entry = last;
6742 			last = got_tree_entry_get_next(s->tree, last);
6743 		}
6744 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6745 			s->first_displayed_entry = next;
6746 			next = got_tree_entry_get_next(s->tree, next);
6747 		}
6748 	}
6749 
6750 	return NULL;
6751 }
6752 
6753 static const struct got_error *
6754 tree_entry_path(char **path, struct tog_parent_trees *parents,
6755     struct got_tree_entry *te)
6756 {
6757 	const struct got_error *err = NULL;
6758 	struct tog_parent_tree *pt;
6759 	size_t len = 2; /* for leading slash and NUL */
6760 
6761 	TAILQ_FOREACH(pt, parents, entry)
6762 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6763 		    + 1 /* slash */;
6764 	if (te)
6765 		len += strlen(got_tree_entry_get_name(te));
6766 
6767 	*path = calloc(1, len);
6768 	if (path == NULL)
6769 		return got_error_from_errno("calloc");
6770 
6771 	(*path)[0] = '/';
6772 	pt = TAILQ_LAST(parents, tog_parent_trees);
6773 	while (pt) {
6774 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6775 		if (strlcat(*path, name, len) >= len) {
6776 			err = got_error(GOT_ERR_NO_SPACE);
6777 			goto done;
6778 		}
6779 		if (strlcat(*path, "/", len) >= len) {
6780 			err = got_error(GOT_ERR_NO_SPACE);
6781 			goto done;
6782 		}
6783 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6784 	}
6785 	if (te) {
6786 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6787 			err = got_error(GOT_ERR_NO_SPACE);
6788 			goto done;
6789 		}
6790 	}
6791 done:
6792 	if (err) {
6793 		free(*path);
6794 		*path = NULL;
6795 	}
6796 	return err;
6797 }
6798 
6799 static const struct got_error *
6800 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6801     struct got_tree_entry *te, struct tog_parent_trees *parents,
6802     struct got_object_id *commit_id, struct got_repository *repo)
6803 {
6804 	const struct got_error *err = NULL;
6805 	char *path;
6806 	struct tog_view *blame_view;
6807 
6808 	*new_view = NULL;
6809 
6810 	err = tree_entry_path(&path, parents, te);
6811 	if (err)
6812 		return err;
6813 
6814 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6815 	if (blame_view == NULL) {
6816 		err = got_error_from_errno("view_open");
6817 		goto done;
6818 	}
6819 
6820 	err = open_blame_view(blame_view, path, commit_id, repo);
6821 	if (err) {
6822 		if (err->code == GOT_ERR_CANCELLED)
6823 			err = NULL;
6824 		view_close(blame_view);
6825 	} else
6826 		*new_view = blame_view;
6827 done:
6828 	free(path);
6829 	return err;
6830 }
6831 
6832 static const struct got_error *
6833 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6834     struct tog_tree_view_state *s)
6835 {
6836 	struct tog_view *log_view;
6837 	const struct got_error *err = NULL;
6838 	char *path;
6839 
6840 	*new_view = NULL;
6841 
6842 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6843 	if (log_view == NULL)
6844 		return got_error_from_errno("view_open");
6845 
6846 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6847 	if (err)
6848 		return err;
6849 
6850 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6851 	    path, 0);
6852 	if (err)
6853 		view_close(log_view);
6854 	else
6855 		*new_view = log_view;
6856 	free(path);
6857 	return err;
6858 }
6859 
6860 static const struct got_error *
6861 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6862     const char *head_ref_name, struct got_repository *repo)
6863 {
6864 	const struct got_error *err = NULL;
6865 	char *commit_id_str = NULL;
6866 	struct tog_tree_view_state *s = &view->state.tree;
6867 	struct got_commit_object *commit = NULL;
6868 
6869 	TAILQ_INIT(&s->parents);
6870 	STAILQ_INIT(&s->colors);
6871 
6872 	s->commit_id = got_object_id_dup(commit_id);
6873 	if (s->commit_id == NULL)
6874 		return got_error_from_errno("got_object_id_dup");
6875 
6876 	err = got_object_open_as_commit(&commit, repo, commit_id);
6877 	if (err)
6878 		goto done;
6879 
6880 	/*
6881 	 * The root is opened here and will be closed when the view is closed.
6882 	 * Any visited subtrees and their path-wise parents are opened and
6883 	 * closed on demand.
6884 	 */
6885 	err = got_object_open_as_tree(&s->root, repo,
6886 	    got_object_commit_get_tree_id(commit));
6887 	if (err)
6888 		goto done;
6889 	s->tree = s->root;
6890 
6891 	err = got_object_id_str(&commit_id_str, commit_id);
6892 	if (err != NULL)
6893 		goto done;
6894 
6895 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6896 		err = got_error_from_errno("asprintf");
6897 		goto done;
6898 	}
6899 
6900 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6901 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6902 	if (head_ref_name) {
6903 		s->head_ref_name = strdup(head_ref_name);
6904 		if (s->head_ref_name == NULL) {
6905 			err = got_error_from_errno("strdup");
6906 			goto done;
6907 		}
6908 	}
6909 	s->repo = repo;
6910 
6911 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6912 		err = add_color(&s->colors, "\\$$",
6913 		    TOG_COLOR_TREE_SUBMODULE,
6914 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6915 		if (err)
6916 			goto done;
6917 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6918 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6919 		if (err)
6920 			goto done;
6921 		err = add_color(&s->colors, "/$",
6922 		    TOG_COLOR_TREE_DIRECTORY,
6923 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6924 		if (err)
6925 			goto done;
6926 
6927 		err = add_color(&s->colors, "\\*$",
6928 		    TOG_COLOR_TREE_EXECUTABLE,
6929 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6930 		if (err)
6931 			goto done;
6932 
6933 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6934 		    get_color_value("TOG_COLOR_COMMIT"));
6935 		if (err)
6936 			goto done;
6937 	}
6938 
6939 	view->show = show_tree_view;
6940 	view->input = input_tree_view;
6941 	view->close = close_tree_view;
6942 	view->search_start = search_start_tree_view;
6943 	view->search_next = search_next_tree_view;
6944 done:
6945 	free(commit_id_str);
6946 	if (commit)
6947 		got_object_commit_close(commit);
6948 	if (err)
6949 		close_tree_view(view);
6950 	return err;
6951 }
6952 
6953 static const struct got_error *
6954 close_tree_view(struct tog_view *view)
6955 {
6956 	struct tog_tree_view_state *s = &view->state.tree;
6957 
6958 	free_colors(&s->colors);
6959 	free(s->tree_label);
6960 	s->tree_label = NULL;
6961 	free(s->commit_id);
6962 	s->commit_id = NULL;
6963 	free(s->head_ref_name);
6964 	s->head_ref_name = NULL;
6965 	while (!TAILQ_EMPTY(&s->parents)) {
6966 		struct tog_parent_tree *parent;
6967 		parent = TAILQ_FIRST(&s->parents);
6968 		TAILQ_REMOVE(&s->parents, parent, entry);
6969 		if (parent->tree != s->root)
6970 			got_object_tree_close(parent->tree);
6971 		free(parent);
6972 
6973 	}
6974 	if (s->tree != NULL && s->tree != s->root)
6975 		got_object_tree_close(s->tree);
6976 	if (s->root)
6977 		got_object_tree_close(s->root);
6978 	return NULL;
6979 }
6980 
6981 static const struct got_error *
6982 search_start_tree_view(struct tog_view *view)
6983 {
6984 	struct tog_tree_view_state *s = &view->state.tree;
6985 
6986 	s->matched_entry = NULL;
6987 	return NULL;
6988 }
6989 
6990 static int
6991 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6992 {
6993 	regmatch_t regmatch;
6994 
6995 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6996 	    0) == 0;
6997 }
6998 
6999 static const struct got_error *
7000 search_next_tree_view(struct tog_view *view)
7001 {
7002 	struct tog_tree_view_state *s = &view->state.tree;
7003 	struct got_tree_entry *te = NULL;
7004 
7005 	if (!view->searching) {
7006 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7007 		return NULL;
7008 	}
7009 
7010 	if (s->matched_entry) {
7011 		if (view->searching == TOG_SEARCH_FORWARD) {
7012 			if (s->selected_entry)
7013 				te = got_tree_entry_get_next(s->tree,
7014 				    s->selected_entry);
7015 			else
7016 				te = got_object_tree_get_first_entry(s->tree);
7017 		} else {
7018 			if (s->selected_entry == NULL)
7019 				te = got_object_tree_get_last_entry(s->tree);
7020 			else
7021 				te = got_tree_entry_get_prev(s->tree,
7022 				    s->selected_entry);
7023 		}
7024 	} else {
7025 		if (s->selected_entry)
7026 			te = s->selected_entry;
7027 		else if (view->searching == TOG_SEARCH_FORWARD)
7028 			te = got_object_tree_get_first_entry(s->tree);
7029 		else
7030 			te = got_object_tree_get_last_entry(s->tree);
7031 	}
7032 
7033 	while (1) {
7034 		if (te == NULL) {
7035 			if (s->matched_entry == NULL) {
7036 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7037 				return NULL;
7038 			}
7039 			if (view->searching == TOG_SEARCH_FORWARD)
7040 				te = got_object_tree_get_first_entry(s->tree);
7041 			else
7042 				te = got_object_tree_get_last_entry(s->tree);
7043 		}
7044 
7045 		if (match_tree_entry(te, &view->regex)) {
7046 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7047 			s->matched_entry = te;
7048 			break;
7049 		}
7050 
7051 		if (view->searching == TOG_SEARCH_FORWARD)
7052 			te = got_tree_entry_get_next(s->tree, te);
7053 		else
7054 			te = got_tree_entry_get_prev(s->tree, te);
7055 	}
7056 
7057 	if (s->matched_entry) {
7058 		s->first_displayed_entry = s->matched_entry;
7059 		s->selected = 0;
7060 	}
7061 
7062 	return NULL;
7063 }
7064 
7065 static const struct got_error *
7066 show_tree_view(struct tog_view *view)
7067 {
7068 	const struct got_error *err = NULL;
7069 	struct tog_tree_view_state *s = &view->state.tree;
7070 	char *parent_path;
7071 
7072 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7073 	if (err)
7074 		return err;
7075 
7076 	err = draw_tree_entries(view, parent_path);
7077 	free(parent_path);
7078 
7079 	view_border(view);
7080 	return err;
7081 }
7082 
7083 static const struct got_error *
7084 tree_goto_line(struct tog_view *view, int nlines)
7085 {
7086 	const struct got_error		 *err = NULL;
7087 	struct tog_tree_view_state	 *s = &view->state.tree;
7088 	struct got_tree_entry		**fte, **lte, **ste;
7089 	int				  g, last, first = 1, i = 1;
7090 	int				  root = s->tree == s->root;
7091 	int				  off = root ? 1 : 2;
7092 
7093 	g = view->gline;
7094 	view->gline = 0;
7095 
7096 	if (g == 0)
7097 		g = 1;
7098 	else if (g > got_object_tree_get_nentries(s->tree))
7099 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7100 
7101 	fte = &s->first_displayed_entry;
7102 	lte = &s->last_displayed_entry;
7103 	ste = &s->selected_entry;
7104 
7105 	if (*fte != NULL) {
7106 		first = got_tree_entry_get_index(*fte);
7107 		first += off;  /* account for ".." */
7108 	}
7109 	last = got_tree_entry_get_index(*lte);
7110 	last += off;
7111 
7112 	if (g >= first && g <= last && g - first < nlines) {
7113 		s->selected = g - first;
7114 		return NULL;	/* gline is on the current page */
7115 	}
7116 
7117 	if (*ste != NULL) {
7118 		i = got_tree_entry_get_index(*ste);
7119 		i += off;
7120 	}
7121 
7122 	if (i < g) {
7123 		err = tree_scroll_down(view, g - i);
7124 		if (err)
7125 			return err;
7126 		if (got_tree_entry_get_index(*lte) >=
7127 		    got_object_tree_get_nentries(s->tree) - 1 &&
7128 		    first + s->selected < g &&
7129 		    s->selected < s->ndisplayed - 1) {
7130 			first = got_tree_entry_get_index(*fte);
7131 			first += off;
7132 			s->selected = g - first;
7133 		}
7134 	} else if (i > g)
7135 		tree_scroll_up(s, i - g);
7136 
7137 	if (g < nlines &&
7138 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7139 		s->selected = g - 1;
7140 
7141 	return NULL;
7142 }
7143 
7144 static const struct got_error *
7145 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7146 {
7147 	const struct got_error *err = NULL;
7148 	struct tog_tree_view_state *s = &view->state.tree;
7149 	struct got_tree_entry *te;
7150 	int n, nscroll = view->nlines - 3;
7151 
7152 	if (view->gline)
7153 		return tree_goto_line(view, nscroll);
7154 
7155 	switch (ch) {
7156 	case 'i':
7157 		s->show_ids = !s->show_ids;
7158 		view->count = 0;
7159 		break;
7160 	case 'L':
7161 		view->count = 0;
7162 		if (!s->selected_entry)
7163 			break;
7164 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7165 		break;
7166 	case 'R':
7167 		view->count = 0;
7168 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7169 		break;
7170 	case 'g':
7171 	case KEY_HOME:
7172 		s->selected = 0;
7173 		view->count = 0;
7174 		if (s->tree == s->root)
7175 			s->first_displayed_entry =
7176 			    got_object_tree_get_first_entry(s->tree);
7177 		else
7178 			s->first_displayed_entry = NULL;
7179 		break;
7180 	case 'G':
7181 	case KEY_END: {
7182 		int eos = view->nlines - 3;
7183 
7184 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7185 			--eos;  /* border */
7186 		s->selected = 0;
7187 		view->count = 0;
7188 		te = got_object_tree_get_last_entry(s->tree);
7189 		for (n = 0; n < eos; n++) {
7190 			if (te == NULL) {
7191 				if (s->tree != s->root) {
7192 					s->first_displayed_entry = NULL;
7193 					n++;
7194 				}
7195 				break;
7196 			}
7197 			s->first_displayed_entry = te;
7198 			te = got_tree_entry_get_prev(s->tree, te);
7199 		}
7200 		if (n > 0)
7201 			s->selected = n - 1;
7202 		break;
7203 	}
7204 	case 'k':
7205 	case KEY_UP:
7206 	case CTRL('p'):
7207 		if (s->selected > 0) {
7208 			s->selected--;
7209 			break;
7210 		}
7211 		tree_scroll_up(s, 1);
7212 		if (s->selected_entry == NULL ||
7213 		    (s->tree == s->root && s->selected_entry ==
7214 		     got_object_tree_get_first_entry(s->tree)))
7215 			view->count = 0;
7216 		break;
7217 	case CTRL('u'):
7218 	case 'u':
7219 		nscroll /= 2;
7220 		/* FALL THROUGH */
7221 	case KEY_PPAGE:
7222 	case CTRL('b'):
7223 	case 'b':
7224 		if (s->tree == s->root) {
7225 			if (got_object_tree_get_first_entry(s->tree) ==
7226 			    s->first_displayed_entry)
7227 				s->selected -= MIN(s->selected, nscroll);
7228 		} else {
7229 			if (s->first_displayed_entry == NULL)
7230 				s->selected -= MIN(s->selected, nscroll);
7231 		}
7232 		tree_scroll_up(s, MAX(0, nscroll));
7233 		if (s->selected_entry == NULL ||
7234 		    (s->tree == s->root && s->selected_entry ==
7235 		     got_object_tree_get_first_entry(s->tree)))
7236 			view->count = 0;
7237 		break;
7238 	case 'j':
7239 	case KEY_DOWN:
7240 	case CTRL('n'):
7241 		if (s->selected < s->ndisplayed - 1) {
7242 			s->selected++;
7243 			break;
7244 		}
7245 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7246 		    == NULL) {
7247 			/* can't scroll any further */
7248 			view->count = 0;
7249 			break;
7250 		}
7251 		tree_scroll_down(view, 1);
7252 		break;
7253 	case CTRL('d'):
7254 	case 'd':
7255 		nscroll /= 2;
7256 		/* FALL THROUGH */
7257 	case KEY_NPAGE:
7258 	case CTRL('f'):
7259 	case 'f':
7260 	case ' ':
7261 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7262 		    == NULL) {
7263 			/* can't scroll any further; move cursor down */
7264 			if (s->selected < s->ndisplayed - 1)
7265 				s->selected += MIN(nscroll,
7266 				    s->ndisplayed - s->selected - 1);
7267 			else
7268 				view->count = 0;
7269 			break;
7270 		}
7271 		tree_scroll_down(view, nscroll);
7272 		break;
7273 	case KEY_ENTER:
7274 	case '\r':
7275 	case KEY_BACKSPACE:
7276 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7277 			struct tog_parent_tree *parent;
7278 			/* user selected '..' */
7279 			if (s->tree == s->root) {
7280 				view->count = 0;
7281 				break;
7282 			}
7283 			parent = TAILQ_FIRST(&s->parents);
7284 			TAILQ_REMOVE(&s->parents, parent,
7285 			    entry);
7286 			got_object_tree_close(s->tree);
7287 			s->tree = parent->tree;
7288 			s->first_displayed_entry =
7289 			    parent->first_displayed_entry;
7290 			s->selected_entry =
7291 			    parent->selected_entry;
7292 			s->selected = parent->selected;
7293 			if (s->selected > view->nlines - 3) {
7294 				err = offset_selection_down(view);
7295 				if (err)
7296 					break;
7297 			}
7298 			free(parent);
7299 		} else if (S_ISDIR(got_tree_entry_get_mode(
7300 		    s->selected_entry))) {
7301 			struct got_tree_object *subtree;
7302 			view->count = 0;
7303 			err = got_object_open_as_tree(&subtree, s->repo,
7304 			    got_tree_entry_get_id(s->selected_entry));
7305 			if (err)
7306 				break;
7307 			err = tree_view_visit_subtree(s, subtree);
7308 			if (err) {
7309 				got_object_tree_close(subtree);
7310 				break;
7311 			}
7312 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7313 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7314 		break;
7315 	case KEY_RESIZE:
7316 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7317 			s->selected = view->nlines - 4;
7318 		view->count = 0;
7319 		break;
7320 	default:
7321 		view->count = 0;
7322 		break;
7323 	}
7324 
7325 	return err;
7326 }
7327 
7328 __dead static void
7329 usage_tree(void)
7330 {
7331 	endwin();
7332 	fprintf(stderr,
7333 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7334 	    getprogname());
7335 	exit(1);
7336 }
7337 
7338 static const struct got_error *
7339 cmd_tree(int argc, char *argv[])
7340 {
7341 	const struct got_error *error;
7342 	struct got_repository *repo = NULL;
7343 	struct got_worktree *worktree = NULL;
7344 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7345 	struct got_object_id *commit_id = NULL;
7346 	struct got_commit_object *commit = NULL;
7347 	const char *commit_id_arg = NULL;
7348 	char *label = NULL;
7349 	struct got_reference *ref = NULL;
7350 	const char *head_ref_name = NULL;
7351 	int ch;
7352 	struct tog_view *view;
7353 	int *pack_fds = NULL;
7354 
7355 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7356 		switch (ch) {
7357 		case 'c':
7358 			commit_id_arg = optarg;
7359 			break;
7360 		case 'r':
7361 			repo_path = realpath(optarg, NULL);
7362 			if (repo_path == NULL)
7363 				return got_error_from_errno2("realpath",
7364 				    optarg);
7365 			break;
7366 		default:
7367 			usage_tree();
7368 			/* NOTREACHED */
7369 		}
7370 	}
7371 
7372 	argc -= optind;
7373 	argv += optind;
7374 
7375 	if (argc > 1)
7376 		usage_tree();
7377 
7378 	error = got_repo_pack_fds_open(&pack_fds);
7379 	if (error != NULL)
7380 		goto done;
7381 
7382 	if (repo_path == NULL) {
7383 		cwd = getcwd(NULL, 0);
7384 		if (cwd == NULL)
7385 			return got_error_from_errno("getcwd");
7386 		error = got_worktree_open(&worktree, cwd);
7387 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7388 			goto done;
7389 		if (worktree)
7390 			repo_path =
7391 			    strdup(got_worktree_get_repo_path(worktree));
7392 		else
7393 			repo_path = strdup(cwd);
7394 		if (repo_path == NULL) {
7395 			error = got_error_from_errno("strdup");
7396 			goto done;
7397 		}
7398 	}
7399 
7400 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7401 	if (error != NULL)
7402 		goto done;
7403 
7404 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7405 	    repo, worktree);
7406 	if (error)
7407 		goto done;
7408 
7409 	init_curses();
7410 
7411 	error = apply_unveil(got_repo_get_path(repo), NULL);
7412 	if (error)
7413 		goto done;
7414 
7415 	error = tog_load_refs(repo, 0);
7416 	if (error)
7417 		goto done;
7418 
7419 	if (commit_id_arg == NULL) {
7420 		error = got_repo_match_object_id(&commit_id, &label,
7421 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7422 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7423 		if (error)
7424 			goto done;
7425 		head_ref_name = label;
7426 	} else {
7427 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7428 		if (error == NULL)
7429 			head_ref_name = got_ref_get_name(ref);
7430 		else if (error->code != GOT_ERR_NOT_REF)
7431 			goto done;
7432 		error = got_repo_match_object_id(&commit_id, NULL,
7433 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7434 		if (error)
7435 			goto done;
7436 	}
7437 
7438 	error = got_object_open_as_commit(&commit, repo, commit_id);
7439 	if (error)
7440 		goto done;
7441 
7442 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7443 	if (view == NULL) {
7444 		error = got_error_from_errno("view_open");
7445 		goto done;
7446 	}
7447 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7448 	if (error)
7449 		goto done;
7450 	if (!got_path_is_root_dir(in_repo_path)) {
7451 		error = tree_view_walk_path(&view->state.tree, commit,
7452 		    in_repo_path);
7453 		if (error)
7454 			goto done;
7455 	}
7456 
7457 	if (worktree) {
7458 		/* Release work tree lock. */
7459 		got_worktree_close(worktree);
7460 		worktree = NULL;
7461 	}
7462 	error = view_loop(view);
7463 done:
7464 	free(repo_path);
7465 	free(cwd);
7466 	free(commit_id);
7467 	free(label);
7468 	if (ref)
7469 		got_ref_close(ref);
7470 	if (repo) {
7471 		const struct got_error *close_err = got_repo_close(repo);
7472 		if (error == NULL)
7473 			error = close_err;
7474 	}
7475 	if (pack_fds) {
7476 		const struct got_error *pack_err =
7477 		    got_repo_pack_fds_close(pack_fds);
7478 		if (error == NULL)
7479 			error = pack_err;
7480 	}
7481 	tog_free_refs();
7482 	return error;
7483 }
7484 
7485 static const struct got_error *
7486 ref_view_load_refs(struct tog_ref_view_state *s)
7487 {
7488 	struct got_reflist_entry *sre;
7489 	struct tog_reflist_entry *re;
7490 
7491 	s->nrefs = 0;
7492 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7493 		if (strncmp(got_ref_get_name(sre->ref),
7494 		    "refs/got/", 9) == 0 &&
7495 		    strncmp(got_ref_get_name(sre->ref),
7496 		    "refs/got/backup/", 16) != 0)
7497 			continue;
7498 
7499 		re = malloc(sizeof(*re));
7500 		if (re == NULL)
7501 			return got_error_from_errno("malloc");
7502 
7503 		re->ref = got_ref_dup(sre->ref);
7504 		if (re->ref == NULL)
7505 			return got_error_from_errno("got_ref_dup");
7506 		re->idx = s->nrefs++;
7507 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7508 	}
7509 
7510 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7511 	return NULL;
7512 }
7513 
7514 static void
7515 ref_view_free_refs(struct tog_ref_view_state *s)
7516 {
7517 	struct tog_reflist_entry *re;
7518 
7519 	while (!TAILQ_EMPTY(&s->refs)) {
7520 		re = TAILQ_FIRST(&s->refs);
7521 		TAILQ_REMOVE(&s->refs, re, entry);
7522 		got_ref_close(re->ref);
7523 		free(re);
7524 	}
7525 }
7526 
7527 static const struct got_error *
7528 open_ref_view(struct tog_view *view, struct got_repository *repo)
7529 {
7530 	const struct got_error *err = NULL;
7531 	struct tog_ref_view_state *s = &view->state.ref;
7532 
7533 	s->selected_entry = 0;
7534 	s->repo = repo;
7535 
7536 	TAILQ_INIT(&s->refs);
7537 	STAILQ_INIT(&s->colors);
7538 
7539 	err = ref_view_load_refs(s);
7540 	if (err)
7541 		return err;
7542 
7543 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7544 		err = add_color(&s->colors, "^refs/heads/",
7545 		    TOG_COLOR_REFS_HEADS,
7546 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7547 		if (err)
7548 			goto done;
7549 
7550 		err = add_color(&s->colors, "^refs/tags/",
7551 		    TOG_COLOR_REFS_TAGS,
7552 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7553 		if (err)
7554 			goto done;
7555 
7556 		err = add_color(&s->colors, "^refs/remotes/",
7557 		    TOG_COLOR_REFS_REMOTES,
7558 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7559 		if (err)
7560 			goto done;
7561 
7562 		err = add_color(&s->colors, "^refs/got/backup/",
7563 		    TOG_COLOR_REFS_BACKUP,
7564 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7565 		if (err)
7566 			goto done;
7567 	}
7568 
7569 	view->show = show_ref_view;
7570 	view->input = input_ref_view;
7571 	view->close = close_ref_view;
7572 	view->search_start = search_start_ref_view;
7573 	view->search_next = search_next_ref_view;
7574 done:
7575 	if (err)
7576 		free_colors(&s->colors);
7577 	return err;
7578 }
7579 
7580 static const struct got_error *
7581 close_ref_view(struct tog_view *view)
7582 {
7583 	struct tog_ref_view_state *s = &view->state.ref;
7584 
7585 	ref_view_free_refs(s);
7586 	free_colors(&s->colors);
7587 
7588 	return NULL;
7589 }
7590 
7591 static const struct got_error *
7592 resolve_reflist_entry(struct got_object_id **commit_id,
7593     struct tog_reflist_entry *re, struct got_repository *repo)
7594 {
7595 	const struct got_error *err = NULL;
7596 	struct got_object_id *obj_id;
7597 	struct got_tag_object *tag = NULL;
7598 	int obj_type;
7599 
7600 	*commit_id = NULL;
7601 
7602 	err = got_ref_resolve(&obj_id, repo, re->ref);
7603 	if (err)
7604 		return err;
7605 
7606 	err = got_object_get_type(&obj_type, repo, obj_id);
7607 	if (err)
7608 		goto done;
7609 
7610 	switch (obj_type) {
7611 	case GOT_OBJ_TYPE_COMMIT:
7612 		*commit_id = obj_id;
7613 		break;
7614 	case GOT_OBJ_TYPE_TAG:
7615 		err = got_object_open_as_tag(&tag, repo, obj_id);
7616 		if (err)
7617 			goto done;
7618 		free(obj_id);
7619 		err = got_object_get_type(&obj_type, repo,
7620 		    got_object_tag_get_object_id(tag));
7621 		if (err)
7622 			goto done;
7623 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7624 			err = got_error(GOT_ERR_OBJ_TYPE);
7625 			goto done;
7626 		}
7627 		*commit_id = got_object_id_dup(
7628 		    got_object_tag_get_object_id(tag));
7629 		if (*commit_id == NULL) {
7630 			err = got_error_from_errno("got_object_id_dup");
7631 			goto done;
7632 		}
7633 		break;
7634 	default:
7635 		err = got_error(GOT_ERR_OBJ_TYPE);
7636 		break;
7637 	}
7638 
7639 done:
7640 	if (tag)
7641 		got_object_tag_close(tag);
7642 	if (err) {
7643 		free(*commit_id);
7644 		*commit_id = NULL;
7645 	}
7646 	return err;
7647 }
7648 
7649 static const struct got_error *
7650 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7651     struct tog_reflist_entry *re, struct got_repository *repo)
7652 {
7653 	struct tog_view *log_view;
7654 	const struct got_error *err = NULL;
7655 	struct got_object_id *commit_id = NULL;
7656 
7657 	*new_view = NULL;
7658 
7659 	err = resolve_reflist_entry(&commit_id, re, repo);
7660 	if (err) {
7661 		if (err->code != GOT_ERR_OBJ_TYPE)
7662 			return err;
7663 		else
7664 			return NULL;
7665 	}
7666 
7667 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7668 	if (log_view == NULL) {
7669 		err = got_error_from_errno("view_open");
7670 		goto done;
7671 	}
7672 
7673 	err = open_log_view(log_view, commit_id, repo,
7674 	    got_ref_get_name(re->ref), "", 0);
7675 done:
7676 	if (err)
7677 		view_close(log_view);
7678 	else
7679 		*new_view = log_view;
7680 	free(commit_id);
7681 	return err;
7682 }
7683 
7684 static void
7685 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7686 {
7687 	struct tog_reflist_entry *re;
7688 	int i = 0;
7689 
7690 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7691 		return;
7692 
7693 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7694 	while (i++ < maxscroll) {
7695 		if (re == NULL)
7696 			break;
7697 		s->first_displayed_entry = re;
7698 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7699 	}
7700 }
7701 
7702 static const struct got_error *
7703 ref_scroll_down(struct tog_view *view, int maxscroll)
7704 {
7705 	struct tog_ref_view_state *s = &view->state.ref;
7706 	struct tog_reflist_entry *next, *last;
7707 	int n = 0;
7708 
7709 	if (s->first_displayed_entry)
7710 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7711 	else
7712 		next = TAILQ_FIRST(&s->refs);
7713 
7714 	last = s->last_displayed_entry;
7715 	while (next && n++ < maxscroll) {
7716 		if (last) {
7717 			s->last_displayed_entry = last;
7718 			last = TAILQ_NEXT(last, entry);
7719 		}
7720 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7721 			s->first_displayed_entry = next;
7722 			next = TAILQ_NEXT(next, entry);
7723 		}
7724 	}
7725 
7726 	return NULL;
7727 }
7728 
7729 static const struct got_error *
7730 search_start_ref_view(struct tog_view *view)
7731 {
7732 	struct tog_ref_view_state *s = &view->state.ref;
7733 
7734 	s->matched_entry = NULL;
7735 	return NULL;
7736 }
7737 
7738 static int
7739 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7740 {
7741 	regmatch_t regmatch;
7742 
7743 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7744 	    0) == 0;
7745 }
7746 
7747 static const struct got_error *
7748 search_next_ref_view(struct tog_view *view)
7749 {
7750 	struct tog_ref_view_state *s = &view->state.ref;
7751 	struct tog_reflist_entry *re = NULL;
7752 
7753 	if (!view->searching) {
7754 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7755 		return NULL;
7756 	}
7757 
7758 	if (s->matched_entry) {
7759 		if (view->searching == TOG_SEARCH_FORWARD) {
7760 			if (s->selected_entry)
7761 				re = TAILQ_NEXT(s->selected_entry, entry);
7762 			else
7763 				re = TAILQ_PREV(s->selected_entry,
7764 				    tog_reflist_head, entry);
7765 		} else {
7766 			if (s->selected_entry == NULL)
7767 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7768 			else
7769 				re = TAILQ_PREV(s->selected_entry,
7770 				    tog_reflist_head, entry);
7771 		}
7772 	} else {
7773 		if (s->selected_entry)
7774 			re = s->selected_entry;
7775 		else if (view->searching == TOG_SEARCH_FORWARD)
7776 			re = TAILQ_FIRST(&s->refs);
7777 		else
7778 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7779 	}
7780 
7781 	while (1) {
7782 		if (re == NULL) {
7783 			if (s->matched_entry == NULL) {
7784 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7785 				return NULL;
7786 			}
7787 			if (view->searching == TOG_SEARCH_FORWARD)
7788 				re = TAILQ_FIRST(&s->refs);
7789 			else
7790 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7791 		}
7792 
7793 		if (match_reflist_entry(re, &view->regex)) {
7794 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7795 			s->matched_entry = re;
7796 			break;
7797 		}
7798 
7799 		if (view->searching == TOG_SEARCH_FORWARD)
7800 			re = TAILQ_NEXT(re, entry);
7801 		else
7802 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7803 	}
7804 
7805 	if (s->matched_entry) {
7806 		s->first_displayed_entry = s->matched_entry;
7807 		s->selected = 0;
7808 	}
7809 
7810 	return NULL;
7811 }
7812 
7813 static const struct got_error *
7814 show_ref_view(struct tog_view *view)
7815 {
7816 	const struct got_error *err = NULL;
7817 	struct tog_ref_view_state *s = &view->state.ref;
7818 	struct tog_reflist_entry *re;
7819 	char *line = NULL;
7820 	wchar_t *wline;
7821 	struct tog_color *tc;
7822 	int width, n;
7823 	int limit = view->nlines;
7824 
7825 	werase(view->window);
7826 
7827 	s->ndisplayed = 0;
7828 	if (view_is_hsplit_top(view))
7829 		--limit;  /* border */
7830 
7831 	if (limit == 0)
7832 		return NULL;
7833 
7834 	re = s->first_displayed_entry;
7835 
7836 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7837 	    s->nrefs) == -1)
7838 		return got_error_from_errno("asprintf");
7839 
7840 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7841 	if (err) {
7842 		free(line);
7843 		return err;
7844 	}
7845 	if (view_needs_focus_indication(view))
7846 		wstandout(view->window);
7847 	waddwstr(view->window, wline);
7848 	while (width++ < view->ncols)
7849 		waddch(view->window, ' ');
7850 	if (view_needs_focus_indication(view))
7851 		wstandend(view->window);
7852 	free(wline);
7853 	wline = NULL;
7854 	free(line);
7855 	line = NULL;
7856 	if (--limit <= 0)
7857 		return NULL;
7858 
7859 	n = 0;
7860 	while (re && limit > 0) {
7861 		char *line = NULL;
7862 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7863 
7864 		if (s->show_date) {
7865 			struct got_commit_object *ci;
7866 			struct got_tag_object *tag;
7867 			struct got_object_id *id;
7868 			struct tm tm;
7869 			time_t t;
7870 
7871 			err = got_ref_resolve(&id, s->repo, re->ref);
7872 			if (err)
7873 				return err;
7874 			err = got_object_open_as_tag(&tag, s->repo, id);
7875 			if (err) {
7876 				if (err->code != GOT_ERR_OBJ_TYPE) {
7877 					free(id);
7878 					return err;
7879 				}
7880 				err = got_object_open_as_commit(&ci, s->repo,
7881 				    id);
7882 				if (err) {
7883 					free(id);
7884 					return err;
7885 				}
7886 				t = got_object_commit_get_committer_time(ci);
7887 				got_object_commit_close(ci);
7888 			} else {
7889 				t = got_object_tag_get_tagger_time(tag);
7890 				got_object_tag_close(tag);
7891 			}
7892 			free(id);
7893 			if (gmtime_r(&t, &tm) == NULL)
7894 				return got_error_from_errno("gmtime_r");
7895 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7896 				return got_error(GOT_ERR_NO_SPACE);
7897 		}
7898 		if (got_ref_is_symbolic(re->ref)) {
7899 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7900 			    ymd : "", got_ref_get_name(re->ref),
7901 			    got_ref_get_symref_target(re->ref)) == -1)
7902 				return got_error_from_errno("asprintf");
7903 		} else if (s->show_ids) {
7904 			struct got_object_id *id;
7905 			char *id_str;
7906 			err = got_ref_resolve(&id, s->repo, re->ref);
7907 			if (err)
7908 				return err;
7909 			err = got_object_id_str(&id_str, id);
7910 			if (err) {
7911 				free(id);
7912 				return err;
7913 			}
7914 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7915 			    got_ref_get_name(re->ref), id_str) == -1) {
7916 				err = got_error_from_errno("asprintf");
7917 				free(id);
7918 				free(id_str);
7919 				return err;
7920 			}
7921 			free(id);
7922 			free(id_str);
7923 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7924 		    got_ref_get_name(re->ref)) == -1)
7925 			return got_error_from_errno("asprintf");
7926 
7927 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7928 		    0, 0);
7929 		if (err) {
7930 			free(line);
7931 			return err;
7932 		}
7933 		if (n == s->selected) {
7934 			if (view->focussed)
7935 				wstandout(view->window);
7936 			s->selected_entry = re;
7937 		}
7938 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7939 		if (tc)
7940 			wattr_on(view->window,
7941 			    COLOR_PAIR(tc->colorpair), NULL);
7942 		waddwstr(view->window, wline);
7943 		if (tc)
7944 			wattr_off(view->window,
7945 			    COLOR_PAIR(tc->colorpair), NULL);
7946 		if (width < view->ncols - 1)
7947 			waddch(view->window, '\n');
7948 		if (n == s->selected && view->focussed)
7949 			wstandend(view->window);
7950 		free(line);
7951 		free(wline);
7952 		wline = NULL;
7953 		n++;
7954 		s->ndisplayed++;
7955 		s->last_displayed_entry = re;
7956 
7957 		limit--;
7958 		re = TAILQ_NEXT(re, entry);
7959 	}
7960 
7961 	view_border(view);
7962 	return err;
7963 }
7964 
7965 static const struct got_error *
7966 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7967     struct tog_reflist_entry *re, struct got_repository *repo)
7968 {
7969 	const struct got_error *err = NULL;
7970 	struct got_object_id *commit_id = NULL;
7971 	struct tog_view *tree_view;
7972 
7973 	*new_view = NULL;
7974 
7975 	err = resolve_reflist_entry(&commit_id, re, repo);
7976 	if (err) {
7977 		if (err->code != GOT_ERR_OBJ_TYPE)
7978 			return err;
7979 		else
7980 			return NULL;
7981 	}
7982 
7983 
7984 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7985 	if (tree_view == NULL) {
7986 		err = got_error_from_errno("view_open");
7987 		goto done;
7988 	}
7989 
7990 	err = open_tree_view(tree_view, commit_id,
7991 	    got_ref_get_name(re->ref), repo);
7992 	if (err)
7993 		goto done;
7994 
7995 	*new_view = tree_view;
7996 done:
7997 	free(commit_id);
7998 	return err;
7999 }
8000 
8001 static const struct got_error *
8002 ref_goto_line(struct tog_view *view, int nlines)
8003 {
8004 	const struct got_error		*err = NULL;
8005 	struct tog_ref_view_state	*s = &view->state.ref;
8006 	int				 g, idx = s->selected_entry->idx;
8007 
8008 	g = view->gline;
8009 	view->gline = 0;
8010 
8011 	if (g == 0)
8012 		g = 1;
8013 	else if (g > s->nrefs)
8014 		g = s->nrefs;
8015 
8016 	if (g >= s->first_displayed_entry->idx + 1 &&
8017 	    g <= s->last_displayed_entry->idx + 1 &&
8018 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8019 		s->selected = g - s->first_displayed_entry->idx - 1;
8020 		return NULL;
8021 	}
8022 
8023 	if (idx + 1 < g) {
8024 		err = ref_scroll_down(view, g - idx - 1);
8025 		if (err)
8026 			return err;
8027 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8028 		    s->first_displayed_entry->idx + s->selected < g &&
8029 		    s->selected < s->ndisplayed - 1)
8030 			s->selected = g - s->first_displayed_entry->idx - 1;
8031 	} else if (idx + 1 > g)
8032 		ref_scroll_up(s, idx - g + 1);
8033 
8034 	if (g < nlines && s->first_displayed_entry->idx == 0)
8035 		s->selected = g - 1;
8036 
8037 	return NULL;
8038 
8039 }
8040 
8041 static const struct got_error *
8042 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8043 {
8044 	const struct got_error *err = NULL;
8045 	struct tog_ref_view_state *s = &view->state.ref;
8046 	struct tog_reflist_entry *re;
8047 	int n, nscroll = view->nlines - 1;
8048 
8049 	if (view->gline)
8050 		return ref_goto_line(view, nscroll);
8051 
8052 	switch (ch) {
8053 	case 'i':
8054 		s->show_ids = !s->show_ids;
8055 		view->count = 0;
8056 		break;
8057 	case 'm':
8058 		s->show_date = !s->show_date;
8059 		view->count = 0;
8060 		break;
8061 	case 'o':
8062 		s->sort_by_date = !s->sort_by_date;
8063 		view->count = 0;
8064 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8065 		    got_ref_cmp_by_commit_timestamp_descending :
8066 		    tog_ref_cmp_by_name, s->repo);
8067 		if (err)
8068 			break;
8069 		got_reflist_object_id_map_free(tog_refs_idmap);
8070 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8071 		    &tog_refs, s->repo);
8072 		if (err)
8073 			break;
8074 		ref_view_free_refs(s);
8075 		err = ref_view_load_refs(s);
8076 		break;
8077 	case KEY_ENTER:
8078 	case '\r':
8079 		view->count = 0;
8080 		if (!s->selected_entry)
8081 			break;
8082 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8083 		break;
8084 	case 'T':
8085 		view->count = 0;
8086 		if (!s->selected_entry)
8087 			break;
8088 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8089 		break;
8090 	case 'g':
8091 	case KEY_HOME:
8092 		s->selected = 0;
8093 		view->count = 0;
8094 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8095 		break;
8096 	case 'G':
8097 	case KEY_END: {
8098 		int eos = view->nlines - 1;
8099 
8100 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8101 			--eos;  /* border */
8102 		s->selected = 0;
8103 		view->count = 0;
8104 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8105 		for (n = 0; n < eos; n++) {
8106 			if (re == NULL)
8107 				break;
8108 			s->first_displayed_entry = re;
8109 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8110 		}
8111 		if (n > 0)
8112 			s->selected = n - 1;
8113 		break;
8114 	}
8115 	case 'k':
8116 	case KEY_UP:
8117 	case CTRL('p'):
8118 		if (s->selected > 0) {
8119 			s->selected--;
8120 			break;
8121 		}
8122 		ref_scroll_up(s, 1);
8123 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8124 			view->count = 0;
8125 		break;
8126 	case CTRL('u'):
8127 	case 'u':
8128 		nscroll /= 2;
8129 		/* FALL THROUGH */
8130 	case KEY_PPAGE:
8131 	case CTRL('b'):
8132 	case 'b':
8133 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8134 			s->selected -= MIN(nscroll, s->selected);
8135 		ref_scroll_up(s, MAX(0, nscroll));
8136 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8137 			view->count = 0;
8138 		break;
8139 	case 'j':
8140 	case KEY_DOWN:
8141 	case CTRL('n'):
8142 		if (s->selected < s->ndisplayed - 1) {
8143 			s->selected++;
8144 			break;
8145 		}
8146 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8147 			/* can't scroll any further */
8148 			view->count = 0;
8149 			break;
8150 		}
8151 		ref_scroll_down(view, 1);
8152 		break;
8153 	case CTRL('d'):
8154 	case 'd':
8155 		nscroll /= 2;
8156 		/* FALL THROUGH */
8157 	case KEY_NPAGE:
8158 	case CTRL('f'):
8159 	case 'f':
8160 	case ' ':
8161 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8162 			/* can't scroll any further; move cursor down */
8163 			if (s->selected < s->ndisplayed - 1)
8164 				s->selected += MIN(nscroll,
8165 				    s->ndisplayed - s->selected - 1);
8166 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8167 				s->selected += s->ndisplayed - s->selected - 1;
8168 			view->count = 0;
8169 			break;
8170 		}
8171 		ref_scroll_down(view, nscroll);
8172 		break;
8173 	case CTRL('l'):
8174 		view->count = 0;
8175 		tog_free_refs();
8176 		err = tog_load_refs(s->repo, s->sort_by_date);
8177 		if (err)
8178 			break;
8179 		ref_view_free_refs(s);
8180 		err = ref_view_load_refs(s);
8181 		break;
8182 	case KEY_RESIZE:
8183 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8184 			s->selected = view->nlines - 2;
8185 		break;
8186 	default:
8187 		view->count = 0;
8188 		break;
8189 	}
8190 
8191 	return err;
8192 }
8193 
8194 __dead static void
8195 usage_ref(void)
8196 {
8197 	endwin();
8198 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8199 	    getprogname());
8200 	exit(1);
8201 }
8202 
8203 static const struct got_error *
8204 cmd_ref(int argc, char *argv[])
8205 {
8206 	const struct got_error *error;
8207 	struct got_repository *repo = NULL;
8208 	struct got_worktree *worktree = NULL;
8209 	char *cwd = NULL, *repo_path = NULL;
8210 	int ch;
8211 	struct tog_view *view;
8212 	int *pack_fds = NULL;
8213 
8214 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8215 		switch (ch) {
8216 		case 'r':
8217 			repo_path = realpath(optarg, NULL);
8218 			if (repo_path == NULL)
8219 				return got_error_from_errno2("realpath",
8220 				    optarg);
8221 			break;
8222 		default:
8223 			usage_ref();
8224 			/* NOTREACHED */
8225 		}
8226 	}
8227 
8228 	argc -= optind;
8229 	argv += optind;
8230 
8231 	if (argc > 1)
8232 		usage_ref();
8233 
8234 	error = got_repo_pack_fds_open(&pack_fds);
8235 	if (error != NULL)
8236 		goto done;
8237 
8238 	if (repo_path == NULL) {
8239 		cwd = getcwd(NULL, 0);
8240 		if (cwd == NULL)
8241 			return got_error_from_errno("getcwd");
8242 		error = got_worktree_open(&worktree, cwd);
8243 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8244 			goto done;
8245 		if (worktree)
8246 			repo_path =
8247 			    strdup(got_worktree_get_repo_path(worktree));
8248 		else
8249 			repo_path = strdup(cwd);
8250 		if (repo_path == NULL) {
8251 			error = got_error_from_errno("strdup");
8252 			goto done;
8253 		}
8254 	}
8255 
8256 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8257 	if (error != NULL)
8258 		goto done;
8259 
8260 	init_curses();
8261 
8262 	error = apply_unveil(got_repo_get_path(repo), NULL);
8263 	if (error)
8264 		goto done;
8265 
8266 	error = tog_load_refs(repo, 0);
8267 	if (error)
8268 		goto done;
8269 
8270 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8271 	if (view == NULL) {
8272 		error = got_error_from_errno("view_open");
8273 		goto done;
8274 	}
8275 
8276 	error = open_ref_view(view, repo);
8277 	if (error)
8278 		goto done;
8279 
8280 	if (worktree) {
8281 		/* Release work tree lock. */
8282 		got_worktree_close(worktree);
8283 		worktree = NULL;
8284 	}
8285 	error = view_loop(view);
8286 done:
8287 	free(repo_path);
8288 	free(cwd);
8289 	if (repo) {
8290 		const struct got_error *close_err = got_repo_close(repo);
8291 		if (close_err)
8292 			error = close_err;
8293 	}
8294 	if (pack_fds) {
8295 		const struct got_error *pack_err =
8296 		    got_repo_pack_fds_close(pack_fds);
8297 		if (error == NULL)
8298 			error = pack_err;
8299 	}
8300 	tog_free_refs();
8301 	return error;
8302 }
8303 
8304 static const struct got_error *
8305 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8306     enum tog_view_type request, int y, int x)
8307 {
8308 	const struct got_error *err = NULL;
8309 
8310 	*new_view = NULL;
8311 
8312 	switch (request) {
8313 	case TOG_VIEW_DIFF:
8314 		if (view->type == TOG_VIEW_LOG) {
8315 			struct tog_log_view_state *s = &view->state.log;
8316 
8317 			err = open_diff_view_for_commit(new_view, y, x,
8318 			    s->selected_entry->commit, s->selected_entry->id,
8319 			    view, s->repo);
8320 		} else
8321 			return got_error_msg(GOT_ERR_NOT_IMPL,
8322 			    "parent/child view pair not supported");
8323 		break;
8324 	case TOG_VIEW_BLAME:
8325 		if (view->type == TOG_VIEW_TREE) {
8326 			struct tog_tree_view_state *s = &view->state.tree;
8327 
8328 			err = blame_tree_entry(new_view, y, x,
8329 			    s->selected_entry, &s->parents, s->commit_id,
8330 			    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_LOG:
8336 		if (view->type == TOG_VIEW_BLAME)
8337 			err = log_annotated_line(new_view, y, x,
8338 			    view->state.blame.repo, view->state.blame.id_to_log);
8339 		else if (view->type == TOG_VIEW_TREE)
8340 			err = log_selected_tree_entry(new_view, y, x,
8341 			    &view->state.tree);
8342 		else if (view->type == TOG_VIEW_REF)
8343 			err = log_ref_entry(new_view, y, x,
8344 			    view->state.ref.selected_entry,
8345 			    view->state.ref.repo);
8346 		else
8347 			return got_error_msg(GOT_ERR_NOT_IMPL,
8348 			    "parent/child view pair not supported");
8349 		break;
8350 	case TOG_VIEW_TREE:
8351 		if (view->type == TOG_VIEW_LOG)
8352 			err = browse_commit_tree(new_view, y, x,
8353 			    view->state.log.selected_entry,
8354 			    view->state.log.in_repo_path,
8355 			    view->state.log.head_ref_name,
8356 			    view->state.log.repo);
8357 		else if (view->type == TOG_VIEW_REF)
8358 			err = browse_ref_tree(new_view, y, x,
8359 			    view->state.ref.selected_entry,
8360 			    view->state.ref.repo);
8361 		else
8362 			return got_error_msg(GOT_ERR_NOT_IMPL,
8363 			    "parent/child view pair not supported");
8364 		break;
8365 	case TOG_VIEW_REF:
8366 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8367 		if (*new_view == NULL)
8368 			return got_error_from_errno("view_open");
8369 		if (view->type == TOG_VIEW_LOG)
8370 			err = open_ref_view(*new_view, view->state.log.repo);
8371 		else if (view->type == TOG_VIEW_TREE)
8372 			err = open_ref_view(*new_view, view->state.tree.repo);
8373 		else
8374 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8375 			    "parent/child view pair not supported");
8376 		if (err)
8377 			view_close(*new_view);
8378 		break;
8379 	default:
8380 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8381 	}
8382 
8383 	return err;
8384 }
8385 
8386 /*
8387  * If view was scrolled down to move the selected line into view when opening a
8388  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8389  */
8390 static void
8391 offset_selection_up(struct tog_view *view)
8392 {
8393 	switch (view->type) {
8394 	case TOG_VIEW_BLAME: {
8395 		struct tog_blame_view_state *s = &view->state.blame;
8396 		if (s->first_displayed_line == 1) {
8397 			s->selected_line = MAX(s->selected_line - view->offset,
8398 			    1);
8399 			break;
8400 		}
8401 		if (s->first_displayed_line > view->offset)
8402 			s->first_displayed_line -= view->offset;
8403 		else
8404 			s->first_displayed_line = 1;
8405 		s->selected_line += view->offset;
8406 		break;
8407 	}
8408 	case TOG_VIEW_LOG:
8409 		log_scroll_up(&view->state.log, view->offset);
8410 		view->state.log.selected += view->offset;
8411 		break;
8412 	case TOG_VIEW_REF:
8413 		ref_scroll_up(&view->state.ref, view->offset);
8414 		view->state.ref.selected += view->offset;
8415 		break;
8416 	case TOG_VIEW_TREE:
8417 		tree_scroll_up(&view->state.tree, view->offset);
8418 		view->state.tree.selected += view->offset;
8419 		break;
8420 	default:
8421 		break;
8422 	}
8423 
8424 	view->offset = 0;
8425 }
8426 
8427 /*
8428  * If the selected line is in the section of screen covered by the bottom split,
8429  * scroll down offset lines to move it into view and index its new position.
8430  */
8431 static const struct got_error *
8432 offset_selection_down(struct tog_view *view)
8433 {
8434 	const struct got_error	*err = NULL;
8435 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8436 	int			*selected = NULL;
8437 	int			 header, offset;
8438 
8439 	switch (view->type) {
8440 	case TOG_VIEW_BLAME: {
8441 		struct tog_blame_view_state *s = &view->state.blame;
8442 		header = 3;
8443 		scrolld = NULL;
8444 		if (s->selected_line > view->nlines - header) {
8445 			offset = abs(view->nlines - s->selected_line - header);
8446 			s->first_displayed_line += offset;
8447 			s->selected_line -= offset;
8448 			view->offset = offset;
8449 		}
8450 		break;
8451 	}
8452 	case TOG_VIEW_LOG: {
8453 		struct tog_log_view_state *s = &view->state.log;
8454 		scrolld = &log_scroll_down;
8455 		header = view_is_parent_view(view) ? 3 : 2;
8456 		selected = &s->selected;
8457 		break;
8458 	}
8459 	case TOG_VIEW_REF: {
8460 		struct tog_ref_view_state *s = &view->state.ref;
8461 		scrolld = &ref_scroll_down;
8462 		header = 3;
8463 		selected = &s->selected;
8464 		break;
8465 	}
8466 	case TOG_VIEW_TREE: {
8467 		struct tog_tree_view_state *s = &view->state.tree;
8468 		scrolld = &tree_scroll_down;
8469 		header = 5;
8470 		selected = &s->selected;
8471 		break;
8472 	}
8473 	default:
8474 		selected = NULL;
8475 		scrolld = NULL;
8476 		header = 0;
8477 		break;
8478 	}
8479 
8480 	if (selected && *selected > view->nlines - header) {
8481 		offset = abs(view->nlines - *selected - header);
8482 		view->offset = offset;
8483 		if (scrolld && offset) {
8484 			err = scrolld(view, offset);
8485 			*selected -= offset;
8486 		}
8487 	}
8488 
8489 	return err;
8490 }
8491 
8492 static void
8493 list_commands(FILE *fp)
8494 {
8495 	size_t i;
8496 
8497 	fprintf(fp, "commands:");
8498 	for (i = 0; i < nitems(tog_commands); i++) {
8499 		const struct tog_cmd *cmd = &tog_commands[i];
8500 		fprintf(fp, " %s", cmd->name);
8501 	}
8502 	fputc('\n', fp);
8503 }
8504 
8505 __dead static void
8506 usage(int hflag, int status)
8507 {
8508 	FILE *fp = (status == 0) ? stdout : stderr;
8509 
8510 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8511 	    getprogname());
8512 	if (hflag) {
8513 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8514 		list_commands(fp);
8515 	}
8516 	exit(status);
8517 }
8518 
8519 static char **
8520 make_argv(int argc, ...)
8521 {
8522 	va_list ap;
8523 	char **argv;
8524 	int i;
8525 
8526 	va_start(ap, argc);
8527 
8528 	argv = calloc(argc, sizeof(char *));
8529 	if (argv == NULL)
8530 		err(1, "calloc");
8531 	for (i = 0; i < argc; i++) {
8532 		argv[i] = strdup(va_arg(ap, char *));
8533 		if (argv[i] == NULL)
8534 			err(1, "strdup");
8535 	}
8536 
8537 	va_end(ap);
8538 	return argv;
8539 }
8540 
8541 /*
8542  * Try to convert 'tog path' into a 'tog log path' command.
8543  * The user could simply have mistyped the command rather than knowingly
8544  * provided a path. So check whether argv[0] can in fact be resolved
8545  * to a path in the HEAD commit and print a special error if not.
8546  * This hack is for mpi@ <3
8547  */
8548 static const struct got_error *
8549 tog_log_with_path(int argc, char *argv[])
8550 {
8551 	const struct got_error *error = NULL, *close_err;
8552 	const struct tog_cmd *cmd = NULL;
8553 	struct got_repository *repo = NULL;
8554 	struct got_worktree *worktree = NULL;
8555 	struct got_object_id *commit_id = NULL, *id = NULL;
8556 	struct got_commit_object *commit = NULL;
8557 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8558 	char *commit_id_str = NULL, **cmd_argv = NULL;
8559 	int *pack_fds = NULL;
8560 
8561 	cwd = getcwd(NULL, 0);
8562 	if (cwd == NULL)
8563 		return got_error_from_errno("getcwd");
8564 
8565 	error = got_repo_pack_fds_open(&pack_fds);
8566 	if (error != NULL)
8567 		goto done;
8568 
8569 	error = got_worktree_open(&worktree, cwd);
8570 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8571 		goto done;
8572 
8573 	if (worktree)
8574 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8575 	else
8576 		repo_path = strdup(cwd);
8577 	if (repo_path == NULL) {
8578 		error = got_error_from_errno("strdup");
8579 		goto done;
8580 	}
8581 
8582 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8583 	if (error != NULL)
8584 		goto done;
8585 
8586 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8587 	    repo, worktree);
8588 	if (error)
8589 		goto done;
8590 
8591 	error = tog_load_refs(repo, 0);
8592 	if (error)
8593 		goto done;
8594 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8595 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8596 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8597 	if (error)
8598 		goto done;
8599 
8600 	if (worktree) {
8601 		got_worktree_close(worktree);
8602 		worktree = NULL;
8603 	}
8604 
8605 	error = got_object_open_as_commit(&commit, repo, commit_id);
8606 	if (error)
8607 		goto done;
8608 
8609 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8610 	if (error) {
8611 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8612 			goto done;
8613 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8614 		    getprogname(), argv[0]);
8615 		usage(1, 1);
8616 		/* not reached */
8617 	}
8618 
8619 	error = got_object_id_str(&commit_id_str, commit_id);
8620 	if (error)
8621 		goto done;
8622 
8623 	cmd = &tog_commands[0]; /* log */
8624 	argc = 4;
8625 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8626 	error = cmd->cmd_main(argc, cmd_argv);
8627 done:
8628 	if (repo) {
8629 		close_err = got_repo_close(repo);
8630 		if (error == NULL)
8631 			error = close_err;
8632 	}
8633 	if (commit)
8634 		got_object_commit_close(commit);
8635 	if (worktree)
8636 		got_worktree_close(worktree);
8637 	if (pack_fds) {
8638 		const struct got_error *pack_err =
8639 		    got_repo_pack_fds_close(pack_fds);
8640 		if (error == NULL)
8641 			error = pack_err;
8642 	}
8643 	free(id);
8644 	free(commit_id_str);
8645 	free(commit_id);
8646 	free(cwd);
8647 	free(repo_path);
8648 	free(in_repo_path);
8649 	if (cmd_argv) {
8650 		int i;
8651 		for (i = 0; i < argc; i++)
8652 			free(cmd_argv[i]);
8653 		free(cmd_argv);
8654 	}
8655 	tog_free_refs();
8656 	return error;
8657 }
8658 
8659 int
8660 main(int argc, char *argv[])
8661 {
8662 	const struct got_error *error = NULL;
8663 	const struct tog_cmd *cmd = NULL;
8664 	int ch, hflag = 0, Vflag = 0;
8665 	char **cmd_argv = NULL;
8666 	static const struct option longopts[] = {
8667 	    { "version", no_argument, NULL, 'V' },
8668 	    { NULL, 0, NULL, 0}
8669 	};
8670 	char *diff_algo_str = NULL;
8671 
8672 	if (!isatty(STDIN_FILENO))
8673 		errx(1, "standard input is not a tty");
8674 
8675 	setlocale(LC_CTYPE, "");
8676 
8677 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8678 		switch (ch) {
8679 		case 'h':
8680 			hflag = 1;
8681 			break;
8682 		case 'V':
8683 			Vflag = 1;
8684 			break;
8685 		default:
8686 			usage(hflag, 1);
8687 			/* NOTREACHED */
8688 		}
8689 	}
8690 
8691 	argc -= optind;
8692 	argv += optind;
8693 	optind = 1;
8694 	optreset = 1;
8695 
8696 	if (Vflag) {
8697 		got_version_print_str();
8698 		return 0;
8699 	}
8700 
8701 #ifndef PROFILE
8702 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8703 	    NULL) == -1)
8704 		err(1, "pledge");
8705 #endif
8706 
8707 	if (argc == 0) {
8708 		if (hflag)
8709 			usage(hflag, 0);
8710 		/* Build an argument vector which runs a default command. */
8711 		cmd = &tog_commands[0];
8712 		argc = 1;
8713 		cmd_argv = make_argv(argc, cmd->name);
8714 	} else {
8715 		size_t i;
8716 
8717 		/* Did the user specify a command? */
8718 		for (i = 0; i < nitems(tog_commands); i++) {
8719 			if (strncmp(tog_commands[i].name, argv[0],
8720 			    strlen(argv[0])) == 0) {
8721 				cmd = &tog_commands[i];
8722 				break;
8723 			}
8724 		}
8725 	}
8726 
8727 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8728 	if (diff_algo_str) {
8729 		if (strcasecmp(diff_algo_str, "patience") == 0)
8730 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8731 		if (strcasecmp(diff_algo_str, "myers") == 0)
8732 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8733 	}
8734 
8735 	if (cmd == NULL) {
8736 		if (argc != 1)
8737 			usage(0, 1);
8738 		/* No command specified; try log with a path */
8739 		error = tog_log_with_path(argc, argv);
8740 	} else {
8741 		if (hflag)
8742 			cmd->cmd_usage();
8743 		else
8744 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8745 	}
8746 
8747 	endwin();
8748 	putchar('\n');
8749 	if (cmd_argv) {
8750 		int i;
8751 		for (i = 0; i < argc; i++)
8752 			free(cmd_argv[i]);
8753 		free(cmd_argv);
8754 	}
8755 
8756 	if (error && error->code != GOT_ERR_CANCELLED)
8757 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8758 	return 0;
8759 }