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 <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static struct {
155 	struct got_object_id	*id;
156 	int			 idx;
157 	char			 marker;
158 } tog_base_commit;
159 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
160 
161 static const struct got_error *
162 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
163     struct got_reference* re2)
164 {
165 	const char *name1 = got_ref_get_name(re1);
166 	const char *name2 = got_ref_get_name(re2);
167 	int isbackup1, isbackup2;
168 
169 	/* Sort backup refs towards the bottom of the list. */
170 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
171 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
172 	if (!isbackup1 && isbackup2) {
173 		*cmp = -1;
174 		return NULL;
175 	} else if (isbackup1 && !isbackup2) {
176 		*cmp = 1;
177 		return NULL;
178 	}
179 
180 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
181 	return NULL;
182 }
183 
184 static const struct got_error *
185 tog_load_refs(struct got_repository *repo, int sort_by_date)
186 {
187 	const struct got_error *err;
188 
189 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
190 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
191 	    repo);
192 	if (err)
193 		return err;
194 
195 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
196 	    repo);
197 }
198 
199 static void
200 tog_free_refs(void)
201 {
202 	if (tog_refs_idmap) {
203 		got_reflist_object_id_map_free(tog_refs_idmap);
204 		tog_refs_idmap = NULL;
205 	}
206 	got_ref_list_free(&tog_refs);
207 }
208 
209 static const struct got_error *
210 add_color(struct tog_colors *colors, const char *pattern,
211     int idx, short color)
212 {
213 	const struct got_error *err = NULL;
214 	struct tog_color *tc;
215 	int regerr = 0;
216 
217 	if (idx < 1 || idx > COLOR_PAIRS - 1)
218 		return NULL;
219 
220 	init_pair(idx, color, -1);
221 
222 	tc = calloc(1, sizeof(*tc));
223 	if (tc == NULL)
224 		return got_error_from_errno("calloc");
225 	regerr = regcomp(&tc->regex, pattern,
226 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
227 	if (regerr) {
228 		static char regerr_msg[512];
229 		static char err_msg[512];
230 		regerror(regerr, &tc->regex, regerr_msg,
231 		    sizeof(regerr_msg));
232 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
233 		    regerr_msg);
234 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
235 		free(tc);
236 		return err;
237 	}
238 	tc->colorpair = idx;
239 	STAILQ_INSERT_HEAD(colors, tc, entry);
240 	return NULL;
241 }
242 
243 static void
244 free_colors(struct tog_colors *colors)
245 {
246 	struct tog_color *tc;
247 
248 	while (!STAILQ_EMPTY(colors)) {
249 		tc = STAILQ_FIRST(colors);
250 		STAILQ_REMOVE_HEAD(colors, entry);
251 		regfree(&tc->regex);
252 		free(tc);
253 	}
254 }
255 
256 static struct tog_color *
257 get_color(struct tog_colors *colors, int colorpair)
258 {
259 	struct tog_color *tc = NULL;
260 
261 	STAILQ_FOREACH(tc, colors, entry) {
262 		if (tc->colorpair == colorpair)
263 			return tc;
264 	}
265 
266 	return NULL;
267 }
268 
269 static int
270 default_color_value(const char *envvar)
271 {
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
273 		return COLOR_MAGENTA;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
275 		return COLOR_CYAN;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
277 		return COLOR_YELLOW;
278 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
279 		return COLOR_GREEN;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
283 		return COLOR_MAGENTA;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
285 		return COLOR_CYAN;
286 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
289 		return COLOR_GREEN;
290 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
291 		return COLOR_CYAN;
292 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
293 		return COLOR_YELLOW;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
295 		return COLOR_GREEN;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
297 		return COLOR_MAGENTA;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
299 		return COLOR_YELLOW;
300 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
301 		return COLOR_CYAN;
302 
303 	return -1;
304 }
305 
306 static int
307 get_color_value(const char *envvar)
308 {
309 	const char *val = getenv(envvar);
310 
311 	if (val == NULL)
312 		return default_color_value(envvar);
313 
314 	if (strcasecmp(val, "black") == 0)
315 		return COLOR_BLACK;
316 	if (strcasecmp(val, "red") == 0)
317 		return COLOR_RED;
318 	if (strcasecmp(val, "green") == 0)
319 		return COLOR_GREEN;
320 	if (strcasecmp(val, "yellow") == 0)
321 		return COLOR_YELLOW;
322 	if (strcasecmp(val, "blue") == 0)
323 		return COLOR_BLUE;
324 	if (strcasecmp(val, "magenta") == 0)
325 		return COLOR_MAGENTA;
326 	if (strcasecmp(val, "cyan") == 0)
327 		return COLOR_CYAN;
328 	if (strcasecmp(val, "white") == 0)
329 		return COLOR_WHITE;
330 	if (strcasecmp(val, "default") == 0)
331 		return -1;
332 
333 	return default_color_value(envvar);
334 }
335 
336 struct tog_diff_view_state {
337 	struct got_object_id *id1, *id2;
338 	const char *label1, *label2;
339 	FILE *f, *f1, *f2;
340 	int fd1, fd2;
341 	int lineno;
342 	int first_displayed_line;
343 	int last_displayed_line;
344 	int eof;
345 	int diff_context;
346 	int ignore_whitespace;
347 	int force_text_diff;
348 	struct got_repository *repo;
349 	struct got_diff_line *lines;
350 	size_t nlines;
351 	int matched_line;
352 	int selected_line;
353 
354 	/* passed from log or blame view; may be NULL */
355 	struct tog_view *parent_view;
356 };
357 
358 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
359 static volatile sig_atomic_t tog_thread_error;
360 
361 struct tog_log_thread_args {
362 	pthread_cond_t need_commits;
363 	pthread_cond_t commit_loaded;
364 	int commits_needed;
365 	int load_all;
366 	struct got_commit_graph *graph;
367 	struct commit_queue *real_commits;
368 	const char *in_repo_path;
369 	struct got_object_id *start_id;
370 	struct got_repository *repo;
371 	int *pack_fds;
372 	int log_complete;
373 	sig_atomic_t *quit;
374 	struct commit_queue_entry **first_displayed_entry;
375 	struct commit_queue_entry **selected_entry;
376 	int *searching;
377 	int *search_next_done;
378 	regex_t *regex;
379 	int *limiting;
380 	int limit_match;
381 	regex_t *limit_regex;
382 	struct commit_queue *limit_commits;
383 };
384 
385 struct tog_log_view_state {
386 	struct commit_queue *commits;
387 	struct commit_queue_entry *first_displayed_entry;
388 	struct commit_queue_entry *last_displayed_entry;
389 	struct commit_queue_entry *selected_entry;
390 	struct commit_queue real_commits;
391 	int selected;
392 	char *in_repo_path;
393 	char *head_ref_name;
394 	int log_branches;
395 	struct got_repository *repo;
396 	struct got_object_id *start_id;
397 	sig_atomic_t quit;
398 	pthread_t thread;
399 	struct tog_log_thread_args thread_args;
400 	struct commit_queue_entry *matched_entry;
401 	struct commit_queue_entry *search_entry;
402 	struct tog_colors colors;
403 	int use_committer;
404 	int limit_view;
405 	regex_t limit_regex;
406 	struct commit_queue limit_commits;
407 };
408 
409 #define TOG_COLOR_DIFF_MINUS		1
410 #define TOG_COLOR_DIFF_PLUS		2
411 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
412 #define TOG_COLOR_DIFF_META		4
413 #define TOG_COLOR_TREE_SUBMODULE	5
414 #define TOG_COLOR_TREE_SYMLINK		6
415 #define TOG_COLOR_TREE_DIRECTORY	7
416 #define TOG_COLOR_TREE_EXECUTABLE	8
417 #define TOG_COLOR_COMMIT		9
418 #define TOG_COLOR_AUTHOR		10
419 #define TOG_COLOR_DATE			11
420 #define TOG_COLOR_REFS_HEADS		12
421 #define TOG_COLOR_REFS_TAGS		13
422 #define TOG_COLOR_REFS_REMOTES		14
423 #define TOG_COLOR_REFS_BACKUP		15
424 
425 struct tog_blame_cb_args {
426 	struct tog_blame_line *lines; /* one per line */
427 	int nlines;
428 
429 	struct tog_view *view;
430 	struct got_object_id *commit_id;
431 	int *quit;
432 };
433 
434 struct tog_blame_thread_args {
435 	const char *path;
436 	struct got_repository *repo;
437 	struct tog_blame_cb_args *cb_args;
438 	int *complete;
439 	got_cancel_cb cancel_cb;
440 	void *cancel_arg;
441 	pthread_cond_t blame_complete;
442 };
443 
444 struct tog_blame {
445 	FILE *f;
446 	off_t filesize;
447 	struct tog_blame_line *lines;
448 	int nlines;
449 	off_t *line_offsets;
450 	pthread_t thread;
451 	struct tog_blame_thread_args thread_args;
452 	struct tog_blame_cb_args cb_args;
453 	const char *path;
454 	int *pack_fds;
455 };
456 
457 struct tog_blame_view_state {
458 	int first_displayed_line;
459 	int last_displayed_line;
460 	int selected_line;
461 	int last_diffed_line;
462 	int blame_complete;
463 	int eof;
464 	int done;
465 	struct got_object_id_queue blamed_commits;
466 	struct got_object_qid *blamed_commit;
467 	char *path;
468 	struct got_repository *repo;
469 	struct got_object_id *commit_id;
470 	struct got_object_id *id_to_log;
471 	struct tog_blame blame;
472 	int matched_line;
473 	struct tog_colors colors;
474 };
475 
476 struct tog_parent_tree {
477 	TAILQ_ENTRY(tog_parent_tree) entry;
478 	struct got_tree_object *tree;
479 	struct got_tree_entry *first_displayed_entry;
480 	struct got_tree_entry *selected_entry;
481 	int selected;
482 };
483 
484 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
485 
486 struct tog_tree_view_state {
487 	char *tree_label;
488 	struct got_object_id *commit_id;/* commit which this tree belongs to */
489 	struct got_tree_object *root;	/* the commit's root tree entry */
490 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
491 	struct got_tree_entry *first_displayed_entry;
492 	struct got_tree_entry *last_displayed_entry;
493 	struct got_tree_entry *selected_entry;
494 	int ndisplayed, selected, show_ids;
495 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
496 	char *head_ref_name;
497 	struct got_repository *repo;
498 	struct got_tree_entry *matched_entry;
499 	struct tog_colors colors;
500 };
501 
502 struct tog_reflist_entry {
503 	TAILQ_ENTRY(tog_reflist_entry) entry;
504 	struct got_reference *ref;
505 	int idx;
506 };
507 
508 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
509 
510 struct tog_ref_view_state {
511 	struct tog_reflist_head refs;
512 	struct tog_reflist_entry *first_displayed_entry;
513 	struct tog_reflist_entry *last_displayed_entry;
514 	struct tog_reflist_entry *selected_entry;
515 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
516 	struct got_repository *repo;
517 	struct tog_reflist_entry *matched_entry;
518 	struct tog_colors colors;
519 };
520 
521 struct tog_help_view_state {
522 	FILE			*f;
523 	off_t			*line_offsets;
524 	size_t			 nlines;
525 	int			 lineno;
526 	int			 first_displayed_line;
527 	int			 last_displayed_line;
528 	int			 eof;
529 	int			 matched_line;
530 	int			 selected_line;
531 	int			 all;
532 	enum tog_keymap_type	 type;
533 };
534 
535 #define GENERATE_HELP \
536 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
537 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
538 	KEY_("k C-p Up", "Move cursor or page up one line"), \
539 	KEY_("j C-n Down", "Move cursor or page down one line"), \
540 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
541 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
542 	KEY_("C-u u", "Scroll the view up one half page"), \
543 	KEY_("C-d d", "Scroll the view down one half page"), \
544 	KEY_("g", "Go to line N (default: first line)"), \
545 	KEY_("Home =", "Go to the first line"), \
546 	KEY_("G", "Go to line N (default: last line)"), \
547 	KEY_("End *", "Go to the last line"), \
548 	KEY_("l Right", "Scroll the view right"), \
549 	KEY_("h Left", "Scroll the view left"), \
550 	KEY_("$", "Scroll view to the rightmost position"), \
551 	KEY_("0", "Scroll view to the leftmost position"), \
552 	KEY_("-", "Decrease size of the focussed split"), \
553 	KEY_("+", "Increase size of the focussed split"), \
554 	KEY_("Tab", "Switch focus between views"), \
555 	KEY_("F", "Toggle fullscreen mode"), \
556 	KEY_("S", "Switch split-screen layout"), \
557 	KEY_("/", "Open prompt to enter search term"), \
558 	KEY_("n", "Find next line/token matching the current search term"), \
559 	KEY_("N", "Find previous line/token matching the current search term"),\
560 	KEY_("q", "Quit the focussed view; Quit help screen"), \
561 	KEY_("Q", "Quit tog"), \
562 	\
563 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
564 	KEY_("< ,", "Move cursor up one commit"), \
565 	KEY_("> .", "Move cursor down one commit"), \
566 	KEY_("Enter", "Open diff view of the selected commit"), \
567 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
568 	KEY_("R", "Open ref view of all repository references"), \
569 	KEY_("T", "Display tree view of the repository from the selected" \
570 	    " commit"), \
571 	KEY_("@", "Toggle between displaying author and committer name"), \
572 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
573 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
574 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
575 	\
576 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
577 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
578 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
579 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
580 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
581 	    " data"), \
582 	KEY_("(", "Go to the previous file in the diff"), \
583 	KEY_(")", "Go to the next file in the diff"), \
584 	KEY_("{", "Go to the previous hunk in the diff"), \
585 	KEY_("}", "Go to the next hunk in the diff"), \
586 	KEY_("[", "Decrease the number of context lines"), \
587 	KEY_("]", "Increase the number of context lines"), \
588 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
589 	\
590 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
591 	KEY_("Enter", "Display diff view of the selected line's commit"), \
592 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
593 	KEY_("L", "Open log view for the currently selected annotated line"), \
594 	KEY_("C", "Reload view with the previously blamed commit"), \
595 	KEY_("c", "Reload view with the version of the file found in the" \
596 	    " selected line's commit"), \
597 	KEY_("p", "Reload view with the version of the file found in the" \
598 	    " selected line's parent commit"), \
599 	\
600 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
601 	KEY_("Enter", "Enter selected directory or open blame view of the" \
602 	    " selected file"), \
603 	KEY_("L", "Open log view for the selected entry"), \
604 	KEY_("R", "Open ref view of all repository references"), \
605 	KEY_("i", "Show object IDs for all tree entries"), \
606 	KEY_("Backspace", "Return to the parent directory"), \
607 	\
608 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
609 	KEY_("Enter", "Display log view of the selected reference"), \
610 	KEY_("T", "Display tree view of the selected reference"), \
611 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
612 	KEY_("m", "Toggle display of last modified date for each reference"), \
613 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
614 	KEY_("C-l", "Reload view with all repository references")
615 
616 struct tog_key_map {
617 	const char		*keys;
618 	const char		*info;
619 	enum tog_keymap_type	 type;
620 };
621 
622 /* curses io for tog regress */
623 struct tog_io {
624 	FILE	*cin;
625 	FILE	*cout;
626 	FILE	*f;
627 	FILE	*sdump;
628 	int	 wait_for_ui;
629 } tog_io;
630 static int using_mock_io;
631 
632 #define TOG_KEY_SCRDUMP	SHRT_MIN
633 
634 /*
635  * We implement two types of views: parent views and child views.
636  *
637  * The 'Tab' key switches focus between a parent view and its child view.
638  * Child views are shown side-by-side to their parent view, provided
639  * there is enough screen estate.
640  *
641  * When a new view is opened from within a parent view, this new view
642  * becomes a child view of the parent view, replacing any existing child.
643  *
644  * When a new view is opened from within a child view, this new view
645  * becomes a parent view which will obscure the views below until the
646  * user quits the new parent view by typing 'q'.
647  *
648  * This list of views contains parent views only.
649  * Child views are only pointed to by their parent view.
650  */
651 TAILQ_HEAD(tog_view_list_head, tog_view);
652 
653 struct tog_view {
654 	TAILQ_ENTRY(tog_view) entry;
655 	WINDOW *window;
656 	PANEL *panel;
657 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
658 	int resized_y, resized_x; /* begin_y/x based on user resizing */
659 	int maxx, x; /* max column and current start column */
660 	int lines, cols; /* copies of LINES and COLS */
661 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
662 	int gline, hiline; /* navigate to and highlight this nG line */
663 	int ch, count; /* current keymap and count prefix */
664 	int resized; /* set when in a resize event */
665 	int focussed; /* Only set on one parent or child view at a time. */
666 	int dying;
667 	struct tog_view *parent;
668 	struct tog_view *child;
669 
670 	/*
671 	 * This flag is initially set on parent views when a new child view
672 	 * is created. It gets toggled when the 'Tab' key switches focus
673 	 * between parent and child.
674 	 * The flag indicates whether focus should be passed on to our child
675 	 * view if this parent view gets picked for focus after another parent
676 	 * view was closed. This prevents child views from losing focus in such
677 	 * situations.
678 	 */
679 	int focus_child;
680 
681 	enum tog_view_mode mode;
682 	/* type-specific state */
683 	enum tog_view_type type;
684 	union {
685 		struct tog_diff_view_state diff;
686 		struct tog_log_view_state log;
687 		struct tog_blame_view_state blame;
688 		struct tog_tree_view_state tree;
689 		struct tog_ref_view_state ref;
690 		struct tog_help_view_state help;
691 	} state;
692 
693 	const struct got_error *(*show)(struct tog_view *);
694 	const struct got_error *(*input)(struct tog_view **,
695 	    struct tog_view *, int);
696 	const struct got_error *(*reset)(struct tog_view *);
697 	const struct got_error *(*resize)(struct tog_view *, int);
698 	const struct got_error *(*close)(struct tog_view *);
699 
700 	const struct got_error *(*search_start)(struct tog_view *);
701 	const struct got_error *(*search_next)(struct tog_view *);
702 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
703 	    int **, int **, int **, int **);
704 	int search_started;
705 	int searching;
706 #define TOG_SEARCH_FORWARD	1
707 #define TOG_SEARCH_BACKWARD	2
708 	int search_next_done;
709 #define TOG_SEARCH_HAVE_MORE	1
710 #define TOG_SEARCH_NO_MORE	2
711 #define TOG_SEARCH_HAVE_NONE	3
712 	regex_t regex;
713 	regmatch_t regmatch;
714 	const char *action;
715 };
716 
717 static const struct got_error *open_diff_view(struct tog_view *,
718     struct got_object_id *, struct got_object_id *,
719     const char *, const char *, int, int, int, struct tog_view *,
720     struct got_repository *);
721 static const struct got_error *show_diff_view(struct tog_view *);
722 static const struct got_error *input_diff_view(struct tog_view **,
723     struct tog_view *, int);
724 static const struct got_error *reset_diff_view(struct tog_view *);
725 static const struct got_error* close_diff_view(struct tog_view *);
726 static const struct got_error *search_start_diff_view(struct tog_view *);
727 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
728     size_t *, int **, int **, int **, int **);
729 static const struct got_error *search_next_view_match(struct tog_view *);
730 
731 static const struct got_error *open_log_view(struct tog_view *,
732     struct got_object_id *, struct got_repository *,
733     const char *, const char *, int);
734 static const struct got_error * show_log_view(struct tog_view *);
735 static const struct got_error *input_log_view(struct tog_view **,
736     struct tog_view *, int);
737 static const struct got_error *resize_log_view(struct tog_view *, int);
738 static const struct got_error *close_log_view(struct tog_view *);
739 static const struct got_error *search_start_log_view(struct tog_view *);
740 static const struct got_error *search_next_log_view(struct tog_view *);
741 
742 static const struct got_error *open_blame_view(struct tog_view *, char *,
743     struct got_object_id *, struct got_repository *);
744 static const struct got_error *show_blame_view(struct tog_view *);
745 static const struct got_error *input_blame_view(struct tog_view **,
746     struct tog_view *, int);
747 static const struct got_error *reset_blame_view(struct tog_view *);
748 static const struct got_error *close_blame_view(struct tog_view *);
749 static const struct got_error *search_start_blame_view(struct tog_view *);
750 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
751     size_t *, int **, int **, int **, int **);
752 
753 static const struct got_error *open_tree_view(struct tog_view *,
754     struct got_object_id *, const char *, struct got_repository *);
755 static const struct got_error *show_tree_view(struct tog_view *);
756 static const struct got_error *input_tree_view(struct tog_view **,
757     struct tog_view *, int);
758 static const struct got_error *close_tree_view(struct tog_view *);
759 static const struct got_error *search_start_tree_view(struct tog_view *);
760 static const struct got_error *search_next_tree_view(struct tog_view *);
761 
762 static const struct got_error *open_ref_view(struct tog_view *,
763     struct got_repository *);
764 static const struct got_error *show_ref_view(struct tog_view *);
765 static const struct got_error *input_ref_view(struct tog_view **,
766     struct tog_view *, int);
767 static const struct got_error *close_ref_view(struct tog_view *);
768 static const struct got_error *search_start_ref_view(struct tog_view *);
769 static const struct got_error *search_next_ref_view(struct tog_view *);
770 
771 static const struct got_error *open_help_view(struct tog_view *,
772     struct tog_view *);
773 static const struct got_error *show_help_view(struct tog_view *);
774 static const struct got_error *input_help_view(struct tog_view **,
775     struct tog_view *, int);
776 static const struct got_error *reset_help_view(struct tog_view *);
777 static const struct got_error* close_help_view(struct tog_view *);
778 static const struct got_error *search_start_help_view(struct tog_view *);
779 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
780     size_t *, int **, int **, int **, int **);
781 
782 static volatile sig_atomic_t tog_sigwinch_received;
783 static volatile sig_atomic_t tog_sigpipe_received;
784 static volatile sig_atomic_t tog_sigcont_received;
785 static volatile sig_atomic_t tog_sigint_received;
786 static volatile sig_atomic_t tog_sigterm_received;
787 
788 static void
789 tog_sigwinch(int signo)
790 {
791 	tog_sigwinch_received = 1;
792 }
793 
794 static void
795 tog_sigpipe(int signo)
796 {
797 	tog_sigpipe_received = 1;
798 }
799 
800 static void
801 tog_sigcont(int signo)
802 {
803 	tog_sigcont_received = 1;
804 }
805 
806 static void
807 tog_sigint(int signo)
808 {
809 	tog_sigint_received = 1;
810 }
811 
812 static void
813 tog_sigterm(int signo)
814 {
815 	tog_sigterm_received = 1;
816 }
817 
818 static int
819 tog_fatal_signal_received(void)
820 {
821 	return (tog_sigpipe_received ||
822 	    tog_sigint_received || tog_sigterm_received);
823 }
824 
825 static const struct got_error *
826 view_close(struct tog_view *view)
827 {
828 	const struct got_error *err = NULL, *child_err = NULL;
829 
830 	if (view->child) {
831 		child_err = view_close(view->child);
832 		view->child = NULL;
833 	}
834 	if (view->close)
835 		err = view->close(view);
836 	if (view->panel)
837 		del_panel(view->panel);
838 	if (view->window)
839 		delwin(view->window);
840 	free(view);
841 	return err ? err : child_err;
842 }
843 
844 static struct tog_view *
845 view_open(int nlines, int ncols, int begin_y, int begin_x,
846     enum tog_view_type type)
847 {
848 	struct tog_view *view = calloc(1, sizeof(*view));
849 
850 	if (view == NULL)
851 		return NULL;
852 
853 	view->type = type;
854 	view->lines = LINES;
855 	view->cols = COLS;
856 	view->nlines = nlines ? nlines : LINES - begin_y;
857 	view->ncols = ncols ? ncols : COLS - begin_x;
858 	view->begin_y = begin_y;
859 	view->begin_x = begin_x;
860 	view->window = newwin(nlines, ncols, begin_y, begin_x);
861 	if (view->window == NULL) {
862 		view_close(view);
863 		return NULL;
864 	}
865 	view->panel = new_panel(view->window);
866 	if (view->panel == NULL ||
867 	    set_panel_userptr(view->panel, view) != OK) {
868 		view_close(view);
869 		return NULL;
870 	}
871 
872 	keypad(view->window, TRUE);
873 	return view;
874 }
875 
876 static int
877 view_split_begin_x(int begin_x)
878 {
879 	if (begin_x > 0 || COLS < 120)
880 		return 0;
881 	return (COLS - MAX(COLS / 2, 80));
882 }
883 
884 /* XXX Stub till we decide what to do. */
885 static int
886 view_split_begin_y(int lines)
887 {
888 	return lines * HSPLIT_SCALE;
889 }
890 
891 static const struct got_error *view_resize(struct tog_view *);
892 
893 static const struct got_error *
894 view_splitscreen(struct tog_view *view)
895 {
896 	const struct got_error *err = NULL;
897 
898 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
899 		if (view->resized_y && view->resized_y < view->lines)
900 			view->begin_y = view->resized_y;
901 		else
902 			view->begin_y = view_split_begin_y(view->nlines);
903 		view->begin_x = 0;
904 	} else if (!view->resized) {
905 		if (view->resized_x && view->resized_x < view->cols - 1 &&
906 		    view->cols > 119)
907 			view->begin_x = view->resized_x;
908 		else
909 			view->begin_x = view_split_begin_x(0);
910 		view->begin_y = 0;
911 	}
912 	view->nlines = LINES - view->begin_y;
913 	view->ncols = COLS - view->begin_x;
914 	view->lines = LINES;
915 	view->cols = COLS;
916 	err = view_resize(view);
917 	if (err)
918 		return err;
919 
920 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
921 		view->parent->nlines = view->begin_y;
922 
923 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
924 		return got_error_from_errno("mvwin");
925 
926 	return NULL;
927 }
928 
929 static const struct got_error *
930 view_fullscreen(struct tog_view *view)
931 {
932 	const struct got_error *err = NULL;
933 
934 	view->begin_x = 0;
935 	view->begin_y = view->resized ? view->begin_y : 0;
936 	view->nlines = view->resized ? view->nlines : LINES;
937 	view->ncols = COLS;
938 	view->lines = LINES;
939 	view->cols = COLS;
940 	err = view_resize(view);
941 	if (err)
942 		return err;
943 
944 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
945 		return got_error_from_errno("mvwin");
946 
947 	return NULL;
948 }
949 
950 static int
951 view_is_parent_view(struct tog_view *view)
952 {
953 	return view->parent == NULL;
954 }
955 
956 static int
957 view_is_splitscreen(struct tog_view *view)
958 {
959 	return view->begin_x > 0 || view->begin_y > 0;
960 }
961 
962 static int
963 view_is_fullscreen(struct tog_view *view)
964 {
965 	return view->nlines == LINES && view->ncols == COLS;
966 }
967 
968 static int
969 view_is_hsplit_top(struct tog_view *view)
970 {
971 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
972 	    view_is_splitscreen(view->child);
973 }
974 
975 static void
976 view_border(struct tog_view *view)
977 {
978 	PANEL *panel;
979 	const struct tog_view *view_above;
980 
981 	if (view->parent)
982 		return view_border(view->parent);
983 
984 	panel = panel_above(view->panel);
985 	if (panel == NULL)
986 		return;
987 
988 	view_above = panel_userptr(panel);
989 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
990 		mvwhline(view->window, view_above->begin_y - 1,
991 		    view->begin_x, ACS_HLINE, view->ncols);
992 	else
993 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
994 		    ACS_VLINE, view->nlines);
995 }
996 
997 static const struct got_error *view_init_hsplit(struct tog_view *, int);
998 static const struct got_error *request_log_commits(struct tog_view *);
999 static const struct got_error *offset_selection_down(struct tog_view *);
1000 static void offset_selection_up(struct tog_view *);
1001 static void view_get_split(struct tog_view *, int *, int *);
1002 
1003 static const struct got_error *
1004 view_resize(struct tog_view *view)
1005 {
1006 	const struct got_error	*err = NULL;
1007 	int			 dif, nlines, ncols;
1008 
1009 	dif = LINES - view->lines;  /* line difference */
1010 
1011 	if (view->lines > LINES)
1012 		nlines = view->nlines - (view->lines - LINES);
1013 	else
1014 		nlines = view->nlines + (LINES - view->lines);
1015 	if (view->cols > COLS)
1016 		ncols = view->ncols - (view->cols - COLS);
1017 	else
1018 		ncols = view->ncols + (COLS - view->cols);
1019 
1020 	if (view->child) {
1021 		int hs = view->child->begin_y;
1022 
1023 		if (!view_is_fullscreen(view))
1024 			view->child->begin_x = view_split_begin_x(view->begin_x);
1025 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1026 		    view->child->begin_x == 0) {
1027 			ncols = COLS;
1028 
1029 			view_fullscreen(view->child);
1030 			if (view->child->focussed)
1031 				show_panel(view->child->panel);
1032 			else
1033 				show_panel(view->panel);
1034 		} else {
1035 			ncols = view->child->begin_x;
1036 
1037 			view_splitscreen(view->child);
1038 			show_panel(view->child->panel);
1039 		}
1040 		/*
1041 		 * XXX This is ugly and needs to be moved into the above
1042 		 * logic but "works" for now and my attempts at moving it
1043 		 * break either 'tab' or 'F' key maps in horizontal splits.
1044 		 */
1045 		if (hs) {
1046 			err = view_splitscreen(view->child);
1047 			if (err)
1048 				return err;
1049 			if (dif < 0) { /* top split decreased */
1050 				err = offset_selection_down(view);
1051 				if (err)
1052 					return err;
1053 			}
1054 			view_border(view);
1055 			update_panels();
1056 			doupdate();
1057 			show_panel(view->child->panel);
1058 			nlines = view->nlines;
1059 		}
1060 	} else if (view->parent == NULL)
1061 		ncols = COLS;
1062 
1063 	if (view->resize && dif > 0) {
1064 		err = view->resize(view, dif);
1065 		if (err)
1066 			return err;
1067 	}
1068 
1069 	if (wresize(view->window, nlines, ncols) == ERR)
1070 		return got_error_from_errno("wresize");
1071 	if (replace_panel(view->panel, view->window) == ERR)
1072 		return got_error_from_errno("replace_panel");
1073 	wclear(view->window);
1074 
1075 	view->nlines = nlines;
1076 	view->ncols = ncols;
1077 	view->lines = LINES;
1078 	view->cols = COLS;
1079 
1080 	return NULL;
1081 }
1082 
1083 static const struct got_error *
1084 resize_log_view(struct tog_view *view, int increase)
1085 {
1086 	struct tog_log_view_state	*s = &view->state.log;
1087 	const struct got_error		*err = NULL;
1088 	int				 n = 0;
1089 
1090 	if (s->selected_entry)
1091 		n = s->selected_entry->idx + view->lines - s->selected;
1092 
1093 	/*
1094 	 * Request commits to account for the increased
1095 	 * height so we have enough to populate the view.
1096 	 */
1097 	if (s->commits->ncommits < n) {
1098 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1099 		err = request_log_commits(view);
1100 	}
1101 
1102 	return err;
1103 }
1104 
1105 static void
1106 view_adjust_offset(struct tog_view *view, int n)
1107 {
1108 	if (n == 0)
1109 		return;
1110 
1111 	if (view->parent && view->parent->offset) {
1112 		if (view->parent->offset + n >= 0)
1113 			view->parent->offset += n;
1114 		else
1115 			view->parent->offset = 0;
1116 	} else if (view->offset) {
1117 		if (view->offset - n >= 0)
1118 			view->offset -= n;
1119 		else
1120 			view->offset = 0;
1121 	}
1122 }
1123 
1124 static const struct got_error *
1125 view_resize_split(struct tog_view *view, int resize)
1126 {
1127 	const struct got_error	*err = NULL;
1128 	struct tog_view		*v = NULL;
1129 
1130 	if (view->parent)
1131 		v = view->parent;
1132 	else
1133 		v = view;
1134 
1135 	if (!v->child || !view_is_splitscreen(v->child))
1136 		return NULL;
1137 
1138 	v->resized = v->child->resized = resize;  /* lock for resize event */
1139 
1140 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1141 		if (v->child->resized_y)
1142 			v->child->begin_y = v->child->resized_y;
1143 		if (view->parent)
1144 			v->child->begin_y -= resize;
1145 		else
1146 			v->child->begin_y += resize;
1147 		if (v->child->begin_y < 3) {
1148 			view->count = 0;
1149 			v->child->begin_y = 3;
1150 		} else if (v->child->begin_y > LINES - 1) {
1151 			view->count = 0;
1152 			v->child->begin_y = LINES - 1;
1153 		}
1154 		v->ncols = COLS;
1155 		v->child->ncols = COLS;
1156 		view_adjust_offset(view, resize);
1157 		err = view_init_hsplit(v, v->child->begin_y);
1158 		if (err)
1159 			return err;
1160 		v->child->resized_y = v->child->begin_y;
1161 	} else {
1162 		if (v->child->resized_x)
1163 			v->child->begin_x = v->child->resized_x;
1164 		if (view->parent)
1165 			v->child->begin_x -= resize;
1166 		else
1167 			v->child->begin_x += resize;
1168 		if (v->child->begin_x < 11) {
1169 			view->count = 0;
1170 			v->child->begin_x = 11;
1171 		} else if (v->child->begin_x > COLS - 1) {
1172 			view->count = 0;
1173 			v->child->begin_x = COLS - 1;
1174 		}
1175 		v->child->resized_x = v->child->begin_x;
1176 	}
1177 
1178 	v->child->mode = v->mode;
1179 	v->child->nlines = v->lines - v->child->begin_y;
1180 	v->child->ncols = v->cols - v->child->begin_x;
1181 	v->focus_child = 1;
1182 
1183 	err = view_fullscreen(v);
1184 	if (err)
1185 		return err;
1186 	err = view_splitscreen(v->child);
1187 	if (err)
1188 		return err;
1189 
1190 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1191 		err = offset_selection_down(v->child);
1192 		if (err)
1193 			return err;
1194 	}
1195 
1196 	if (v->resize)
1197 		err = v->resize(v, 0);
1198 	else if (v->child->resize)
1199 		err = v->child->resize(v->child, 0);
1200 
1201 	v->resized = v->child->resized = 0;
1202 
1203 	return err;
1204 }
1205 
1206 static void
1207 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1208 {
1209 	struct tog_view *v = src->child ? src->child : src;
1210 
1211 	dst->resized_x = v->resized_x;
1212 	dst->resized_y = v->resized_y;
1213 }
1214 
1215 static const struct got_error *
1216 view_close_child(struct tog_view *view)
1217 {
1218 	const struct got_error *err = NULL;
1219 
1220 	if (view->child == NULL)
1221 		return NULL;
1222 
1223 	err = view_close(view->child);
1224 	view->child = NULL;
1225 	return err;
1226 }
1227 
1228 static const struct got_error *
1229 view_set_child(struct tog_view *view, struct tog_view *child)
1230 {
1231 	const struct got_error *err = NULL;
1232 
1233 	view->child = child;
1234 	child->parent = view;
1235 
1236 	err = view_resize(view);
1237 	if (err)
1238 		return err;
1239 
1240 	if (view->child->resized_x || view->child->resized_y)
1241 		err = view_resize_split(view, 0);
1242 
1243 	return err;
1244 }
1245 
1246 static const struct got_error *view_dispatch_request(struct tog_view **,
1247     struct tog_view *, enum tog_view_type, int, int);
1248 
1249 static const struct got_error *
1250 view_request_new(struct tog_view **requested, struct tog_view *view,
1251     enum tog_view_type request)
1252 {
1253 	struct tog_view		*new_view = NULL;
1254 	const struct got_error	*err;
1255 	int			 y = 0, x = 0;
1256 
1257 	*requested = NULL;
1258 
1259 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1260 		view_get_split(view, &y, &x);
1261 
1262 	err = view_dispatch_request(&new_view, view, request, y, x);
1263 	if (err)
1264 		return err;
1265 
1266 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1267 	    request != TOG_VIEW_HELP) {
1268 		err = view_init_hsplit(view, y);
1269 		if (err)
1270 			return err;
1271 	}
1272 
1273 	view->focussed = 0;
1274 	new_view->focussed = 1;
1275 	new_view->mode = view->mode;
1276 	new_view->nlines = request == TOG_VIEW_HELP ?
1277 	    view->lines : view->lines - y;
1278 
1279 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1280 		view_transfer_size(new_view, view);
1281 		err = view_close_child(view);
1282 		if (err)
1283 			return err;
1284 		err = view_set_child(view, new_view);
1285 		if (err)
1286 			return err;
1287 		view->focus_child = 1;
1288 	} else
1289 		*requested = new_view;
1290 
1291 	return NULL;
1292 }
1293 
1294 static void
1295 tog_resizeterm(void)
1296 {
1297 	int cols, lines;
1298 	struct winsize size;
1299 
1300 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1301 		cols = 80;     /* Default */
1302 		lines = 24;
1303 	} else {
1304 		cols = size.ws_col;
1305 		lines = size.ws_row;
1306 	}
1307 	resize_term(lines, cols);
1308 }
1309 
1310 static const struct got_error *
1311 view_search_start(struct tog_view *view, int fast_refresh)
1312 {
1313 	const struct got_error *err = NULL;
1314 	struct tog_view *v = view;
1315 	char pattern[1024];
1316 	int ret;
1317 
1318 	if (view->search_started) {
1319 		regfree(&view->regex);
1320 		view->searching = 0;
1321 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1322 	}
1323 	view->search_started = 0;
1324 
1325 	if (view->nlines < 1)
1326 		return NULL;
1327 
1328 	if (view_is_hsplit_top(view))
1329 		v = view->child;
1330 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1331 		v = view->parent;
1332 
1333 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1334 	wclrtoeol(v->window);
1335 
1336 	nodelay(v->window, FALSE);  /* block for search term input */
1337 	nocbreak();
1338 	echo();
1339 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1340 	wrefresh(v->window);
1341 	cbreak();
1342 	noecho();
1343 	nodelay(v->window, TRUE);
1344 	if (!fast_refresh && !using_mock_io)
1345 		halfdelay(10);
1346 	if (ret == ERR)
1347 		return NULL;
1348 
1349 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1350 		err = view->search_start(view);
1351 		if (err) {
1352 			regfree(&view->regex);
1353 			return err;
1354 		}
1355 		view->search_started = 1;
1356 		view->searching = TOG_SEARCH_FORWARD;
1357 		view->search_next_done = 0;
1358 		view->search_next(view);
1359 	}
1360 
1361 	return NULL;
1362 }
1363 
1364 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1365 static const struct got_error *
1366 switch_split(struct tog_view *view)
1367 {
1368 	const struct got_error	*err = NULL;
1369 	struct tog_view		*v = NULL;
1370 
1371 	if (view->parent)
1372 		v = view->parent;
1373 	else
1374 		v = view;
1375 
1376 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1377 		v->mode = TOG_VIEW_SPLIT_VERT;
1378 	else
1379 		v->mode = TOG_VIEW_SPLIT_HRZN;
1380 
1381 	if (!v->child)
1382 		return NULL;
1383 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1384 		v->mode = TOG_VIEW_SPLIT_NONE;
1385 
1386 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1387 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1388 		v->child->begin_y = v->child->resized_y;
1389 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1390 		v->child->begin_x = v->child->resized_x;
1391 
1392 
1393 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1394 		v->ncols = COLS;
1395 		v->child->ncols = COLS;
1396 		v->child->nscrolled = LINES - v->child->nlines;
1397 
1398 		err = view_init_hsplit(v, v->child->begin_y);
1399 		if (err)
1400 			return err;
1401 	}
1402 	v->child->mode = v->mode;
1403 	v->child->nlines = v->lines - v->child->begin_y;
1404 	v->focus_child = 1;
1405 
1406 	err = view_fullscreen(v);
1407 	if (err)
1408 		return err;
1409 	err = view_splitscreen(v->child);
1410 	if (err)
1411 		return err;
1412 
1413 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1414 		v->mode = TOG_VIEW_SPLIT_VERT;
1415 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1416 		err = offset_selection_down(v);
1417 		if (err)
1418 			return err;
1419 		err = offset_selection_down(v->child);
1420 		if (err)
1421 			return err;
1422 	} else {
1423 		offset_selection_up(v);
1424 		offset_selection_up(v->child);
1425 	}
1426 	if (v->resize)
1427 		err = v->resize(v, 0);
1428 	else if (v->child->resize)
1429 		err = v->child->resize(v->child, 0);
1430 
1431 	return err;
1432 }
1433 
1434 /*
1435  * Strip trailing whitespace from str starting at byte *n;
1436  * if *n < 0, use strlen(str). Return new str length in *n.
1437  */
1438 static void
1439 strip_trailing_ws(char *str, int *n)
1440 {
1441 	size_t x = *n;
1442 
1443 	if (str == NULL || *str == '\0')
1444 		return;
1445 
1446 	if (x < 0)
1447 		x = strlen(str);
1448 
1449 	while (x-- > 0 && isspace((unsigned char)str[x]))
1450 		str[x] = '\0';
1451 
1452 	*n = x + 1;
1453 }
1454 
1455 /*
1456  * Extract visible substring of line y from the curses screen
1457  * and strip trailing whitespace. If vline is set, overwrite
1458  * line[vline] with '|' because the ACS_VLINE character is
1459  * written out as 'x'. Write the line to file f.
1460  */
1461 static const struct got_error *
1462 view_write_line(FILE *f, int y, int vline)
1463 {
1464 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1465 	int	r, w;
1466 
1467 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1468 	if (r == ERR)
1469 		return got_error_fmt(GOT_ERR_RANGE,
1470 		    "failed to extract line %d", y);
1471 
1472 	/*
1473 	 * In some views, lines are padded with blanks to COLS width.
1474 	 * Strip them so we can diff without the -b flag when testing.
1475 	 */
1476 	strip_trailing_ws(line, &r);
1477 
1478 	if (vline > 0)
1479 		line[vline] = '|';
1480 
1481 	w = fprintf(f, "%s\n", line);
1482 	if (w != r + 1)		/* \n */
1483 		return got_ferror(f, GOT_ERR_IO);
1484 
1485 	return NULL;
1486 }
1487 
1488 /*
1489  * Capture the visible curses screen by writing each line to the
1490  * file at the path set via the TOG_SCR_DUMP environment variable.
1491  */
1492 static const struct got_error *
1493 screendump(struct tog_view *view)
1494 {
1495 	const struct got_error	*err;
1496 	int			 i;
1497 
1498 	err = got_opentemp_truncate(tog_io.sdump);
1499 	if (err)
1500 		return err;
1501 
1502 	if ((view->child && view->child->begin_x) ||
1503 	    (view->parent && view->begin_x)) {
1504 		int ncols = view->child ? view->ncols : view->parent->ncols;
1505 
1506 		/* vertical splitscreen */
1507 		for (i = 0; i < view->nlines; ++i) {
1508 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1509 			if (err)
1510 				goto done;
1511 		}
1512 	} else {
1513 		int hline = 0;
1514 
1515 		/* fullscreen or horizontal splitscreen */
1516 		if ((view->child && view->child->begin_y) ||
1517 		    (view->parent && view->begin_y))	/* hsplit */
1518 			hline = view->child ?
1519 			    view->child->begin_y : view->begin_y;
1520 
1521 		for (i = 0; i < view->lines; i++) {
1522 			if (hline && i == hline - 1) {
1523 				int c;
1524 
1525 				/* ACS_HLINE writes out as 'q', overwrite it */
1526 				for (c = 0; c < view->cols; ++c)
1527 					fputc('-', tog_io.sdump);
1528 				fputc('\n', tog_io.sdump);
1529 				continue;
1530 			}
1531 
1532 			err = view_write_line(tog_io.sdump, i, 0);
1533 			if (err)
1534 				goto done;
1535 		}
1536 	}
1537 
1538 done:
1539 	return err;
1540 }
1541 
1542 /*
1543  * Compute view->count from numeric input. Assign total to view->count and
1544  * return first non-numeric key entered.
1545  */
1546 static int
1547 get_compound_key(struct tog_view *view, int c)
1548 {
1549 	struct tog_view	*v = view;
1550 	int		 x, n = 0;
1551 
1552 	if (view_is_hsplit_top(view))
1553 		v = view->child;
1554 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1555 		v = view->parent;
1556 
1557 	view->count = 0;
1558 	cbreak();  /* block for input */
1559 	nodelay(view->window, FALSE);
1560 	wmove(v->window, v->nlines - 1, 0);
1561 	wclrtoeol(v->window);
1562 	waddch(v->window, ':');
1563 
1564 	do {
1565 		x = getcurx(v->window);
1566 		if (x != ERR && x < view->ncols) {
1567 			waddch(v->window, c);
1568 			wrefresh(v->window);
1569 		}
1570 
1571 		/*
1572 		 * Don't overflow. Max valid request should be the greatest
1573 		 * between the longest and total lines; cap at 10 million.
1574 		 */
1575 		if (n >= 9999999)
1576 			n = 9999999;
1577 		else
1578 			n = n * 10 + (c - '0');
1579 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1580 
1581 	if (c == 'G' || c == 'g') {	/* nG key map */
1582 		view->gline = view->hiline = n;
1583 		n = 0;
1584 		c = 0;
1585 	}
1586 
1587 	/* Massage excessive or inapplicable values at the input handler. */
1588 	view->count = n;
1589 
1590 	return c;
1591 }
1592 
1593 static void
1594 action_report(struct tog_view *view)
1595 {
1596 	struct tog_view *v = view;
1597 
1598 	if (view_is_hsplit_top(view))
1599 		v = view->child;
1600 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1601 		v = view->parent;
1602 
1603 	wmove(v->window, v->nlines - 1, 0);
1604 	wclrtoeol(v->window);
1605 	wprintw(v->window, ":%s", view->action);
1606 	wrefresh(v->window);
1607 
1608 	/*
1609 	 * Clear action status report. Only clear in blame view
1610 	 * once annotating is complete, otherwise it's too fast.
1611 	 */
1612 	if (view->type == TOG_VIEW_BLAME) {
1613 		if (view->state.blame.blame_complete)
1614 			view->action = NULL;
1615 	} else
1616 		view->action = NULL;
1617 }
1618 
1619 /*
1620  * Read the next line from the test script and assign
1621  * key instruction to *ch. If at EOF, set the *done flag.
1622  */
1623 static const struct got_error *
1624 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1625 {
1626 	const struct got_error	*err = NULL;
1627 	char			*line = NULL;
1628 	size_t			 linesz = 0;
1629 
1630 	if (view->count && --view->count) {
1631 		*ch = view->ch;
1632 		return NULL;
1633 	} else
1634 		*ch = -1;
1635 
1636 	if (getline(&line, &linesz, script) == -1) {
1637 		if (feof(script)) {
1638 			*done = 1;
1639 			goto done;
1640 		} else {
1641 			err = got_ferror(script, GOT_ERR_IO);
1642 			goto done;
1643 		}
1644 	}
1645 
1646 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1647 		tog_io.wait_for_ui = 1;
1648 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1649 		*ch = KEY_ENTER;
1650 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1651 		*ch = KEY_RIGHT;
1652 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1653 		*ch = KEY_LEFT;
1654 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1655 		*ch = KEY_DOWN;
1656 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1657 		*ch = KEY_UP;
1658 	else if (strncasecmp(line, "TAB", 3) == 0)
1659 		*ch = '\t';
1660 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1661 		*ch = TOG_KEY_SCRDUMP;
1662 	else if (isdigit((unsigned char)*line)) {
1663 		char *t = line;
1664 
1665 		while (isdigit((unsigned char)*t))
1666 			++t;
1667 		view->ch = *ch = *t;
1668 		*t = '\0';
1669 		/* ignore error, view->count is 0 if instruction is invalid */
1670 		view->count = strtonum(line, 0, INT_MAX, NULL);
1671 	} else
1672 		*ch = *line;
1673 
1674 done:
1675 	free(line);
1676 	return err;
1677 }
1678 
1679 static const struct got_error *
1680 view_input(struct tog_view **new, int *done, struct tog_view *view,
1681     struct tog_view_list_head *views, int fast_refresh)
1682 {
1683 	const struct got_error *err = NULL;
1684 	struct tog_view *v;
1685 	int ch, errcode;
1686 
1687 	*new = NULL;
1688 
1689 	if (view->action)
1690 		action_report(view);
1691 
1692 	/* Clear "no matches" indicator. */
1693 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1694 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1695 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1696 		view->count = 0;
1697 	}
1698 
1699 	if (view->searching && !view->search_next_done) {
1700 		errcode = pthread_mutex_unlock(&tog_mutex);
1701 		if (errcode)
1702 			return got_error_set_errno(errcode,
1703 			    "pthread_mutex_unlock");
1704 		sched_yield();
1705 		errcode = pthread_mutex_lock(&tog_mutex);
1706 		if (errcode)
1707 			return got_error_set_errno(errcode,
1708 			    "pthread_mutex_lock");
1709 		view->search_next(view);
1710 		return NULL;
1711 	}
1712 
1713 	/* Allow threads to make progress while we are waiting for input. */
1714 	errcode = pthread_mutex_unlock(&tog_mutex);
1715 	if (errcode)
1716 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1717 
1718 	if (using_mock_io) {
1719 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1720 		if (err) {
1721 			errcode = pthread_mutex_lock(&tog_mutex);
1722 			return err;
1723 		}
1724 	} else if (view->count && --view->count) {
1725 		cbreak();
1726 		nodelay(view->window, TRUE);
1727 		ch = wgetch(view->window);
1728 		/* let C-g or backspace abort unfinished count */
1729 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1730 			view->count = 0;
1731 		else
1732 			ch = view->ch;
1733 	} else {
1734 		ch = wgetch(view->window);
1735 		if (ch >= '1' && ch  <= '9')
1736 			view->ch = ch = get_compound_key(view, ch);
1737 	}
1738 	if (view->hiline && ch != ERR && ch != 0)
1739 		view->hiline = 0;  /* key pressed, clear line highlight */
1740 	nodelay(view->window, TRUE);
1741 	errcode = pthread_mutex_lock(&tog_mutex);
1742 	if (errcode)
1743 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1744 
1745 	if (tog_sigwinch_received || tog_sigcont_received) {
1746 		tog_resizeterm();
1747 		tog_sigwinch_received = 0;
1748 		tog_sigcont_received = 0;
1749 		TAILQ_FOREACH(v, views, entry) {
1750 			err = view_resize(v);
1751 			if (err)
1752 				return err;
1753 			err = v->input(new, v, KEY_RESIZE);
1754 			if (err)
1755 				return err;
1756 			if (v->child) {
1757 				err = view_resize(v->child);
1758 				if (err)
1759 					return err;
1760 				err = v->child->input(new, v->child,
1761 				    KEY_RESIZE);
1762 				if (err)
1763 					return err;
1764 				if (v->child->resized_x || v->child->resized_y) {
1765 					err = view_resize_split(v, 0);
1766 					if (err)
1767 						return err;
1768 				}
1769 			}
1770 		}
1771 	}
1772 
1773 	switch (ch) {
1774 	case '?':
1775 	case 'H':
1776 	case KEY_F(1):
1777 		if (view->type == TOG_VIEW_HELP)
1778 			err = view->reset(view);
1779 		else
1780 			err = view_request_new(new, view, TOG_VIEW_HELP);
1781 		break;
1782 	case '\t':
1783 		view->count = 0;
1784 		if (view->child) {
1785 			view->focussed = 0;
1786 			view->child->focussed = 1;
1787 			view->focus_child = 1;
1788 		} else if (view->parent) {
1789 			view->focussed = 0;
1790 			view->parent->focussed = 1;
1791 			view->parent->focus_child = 0;
1792 			if (!view_is_splitscreen(view)) {
1793 				if (view->parent->resize) {
1794 					err = view->parent->resize(view->parent,
1795 					    0);
1796 					if (err)
1797 						return err;
1798 				}
1799 				offset_selection_up(view->parent);
1800 				err = view_fullscreen(view->parent);
1801 				if (err)
1802 					return err;
1803 			}
1804 		}
1805 		break;
1806 	case 'q':
1807 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1808 			if (view->parent->resize) {
1809 				/* might need more commits to fill fullscreen */
1810 				err = view->parent->resize(view->parent, 0);
1811 				if (err)
1812 					break;
1813 			}
1814 			offset_selection_up(view->parent);
1815 		}
1816 		err = view->input(new, view, ch);
1817 		view->dying = 1;
1818 		break;
1819 	case 'Q':
1820 		*done = 1;
1821 		break;
1822 	case 'F':
1823 		view->count = 0;
1824 		if (view_is_parent_view(view)) {
1825 			if (view->child == NULL)
1826 				break;
1827 			if (view_is_splitscreen(view->child)) {
1828 				view->focussed = 0;
1829 				view->child->focussed = 1;
1830 				err = view_fullscreen(view->child);
1831 			} else {
1832 				err = view_splitscreen(view->child);
1833 				if (!err)
1834 					err = view_resize_split(view, 0);
1835 			}
1836 			if (err)
1837 				break;
1838 			err = view->child->input(new, view->child,
1839 			    KEY_RESIZE);
1840 		} else {
1841 			if (view_is_splitscreen(view)) {
1842 				view->parent->focussed = 0;
1843 				view->focussed = 1;
1844 				err = view_fullscreen(view);
1845 			} else {
1846 				err = view_splitscreen(view);
1847 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1848 					err = view_resize(view->parent);
1849 				if (!err)
1850 					err = view_resize_split(view, 0);
1851 			}
1852 			if (err)
1853 				break;
1854 			err = view->input(new, view, KEY_RESIZE);
1855 		}
1856 		if (err)
1857 			break;
1858 		if (view->resize) {
1859 			err = view->resize(view, 0);
1860 			if (err)
1861 				break;
1862 		}
1863 		if (view->parent) {
1864 			if (view->parent->resize) {
1865 				err = view->parent->resize(view->parent, 0);
1866 				if (err != NULL)
1867 					break;
1868 			}
1869 			err = offset_selection_down(view->parent);
1870 			if (err != NULL)
1871 				break;
1872 		}
1873 		err = offset_selection_down(view);
1874 		break;
1875 	case 'S':
1876 		view->count = 0;
1877 		err = switch_split(view);
1878 		break;
1879 	case '-':
1880 		err = view_resize_split(view, -1);
1881 		break;
1882 	case '+':
1883 		err = view_resize_split(view, 1);
1884 		break;
1885 	case KEY_RESIZE:
1886 		break;
1887 	case '/':
1888 		view->count = 0;
1889 		if (view->search_start)
1890 			view_search_start(view, fast_refresh);
1891 		else
1892 			err = view->input(new, view, ch);
1893 		break;
1894 	case 'N':
1895 	case 'n':
1896 		if (view->search_started && view->search_next) {
1897 			view->searching = (ch == 'n' ?
1898 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1899 			view->search_next_done = 0;
1900 			view->search_next(view);
1901 		} else
1902 			err = view->input(new, view, ch);
1903 		break;
1904 	case 'A':
1905 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1906 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1907 			view->action = "Patience diff algorithm";
1908 		} else {
1909 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1910 			view->action = "Myers diff algorithm";
1911 		}
1912 		TAILQ_FOREACH(v, views, entry) {
1913 			if (v->reset) {
1914 				err = v->reset(v);
1915 				if (err)
1916 					return err;
1917 			}
1918 			if (v->child && v->child->reset) {
1919 				err = v->child->reset(v->child);
1920 				if (err)
1921 					return err;
1922 			}
1923 		}
1924 		break;
1925 	case TOG_KEY_SCRDUMP:
1926 		err = screendump(view);
1927 		break;
1928 	default:
1929 		err = view->input(new, view, ch);
1930 		break;
1931 	}
1932 
1933 	return err;
1934 }
1935 
1936 static int
1937 view_needs_focus_indication(struct tog_view *view)
1938 {
1939 	if (view_is_parent_view(view)) {
1940 		if (view->child == NULL || view->child->focussed)
1941 			return 0;
1942 		if (!view_is_splitscreen(view->child))
1943 			return 0;
1944 	} else if (!view_is_splitscreen(view))
1945 		return 0;
1946 
1947 	return view->focussed;
1948 }
1949 
1950 static const struct got_error *
1951 tog_io_close(void)
1952 {
1953 	const struct got_error *err = NULL;
1954 
1955 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1956 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1957 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1958 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1959 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1960 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1961 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1962 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1963 
1964 	return err;
1965 }
1966 
1967 static const struct got_error *
1968 view_loop(struct tog_view *view)
1969 {
1970 	const struct got_error *err = NULL;
1971 	struct tog_view_list_head views;
1972 	struct tog_view *new_view;
1973 	char *mode;
1974 	int fast_refresh = 10;
1975 	int done = 0, errcode;
1976 
1977 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1978 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1979 		view->mode = TOG_VIEW_SPLIT_VERT;
1980 	else
1981 		view->mode = TOG_VIEW_SPLIT_HRZN;
1982 
1983 	errcode = pthread_mutex_lock(&tog_mutex);
1984 	if (errcode)
1985 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1986 
1987 	TAILQ_INIT(&views);
1988 	TAILQ_INSERT_HEAD(&views, view, entry);
1989 
1990 	view->focussed = 1;
1991 	err = view->show(view);
1992 	if (err)
1993 		return err;
1994 	update_panels();
1995 	doupdate();
1996 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1997 	    !tog_fatal_signal_received()) {
1998 		/* Refresh fast during initialization, then become slower. */
1999 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
2000 			halfdelay(10); /* switch to once per second */
2001 
2002 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2003 		if (err)
2004 			break;
2005 
2006 		if (view->dying && view == TAILQ_FIRST(&views) &&
2007 		    TAILQ_NEXT(view, entry) == NULL)
2008 			done = 1;
2009 		if (done) {
2010 			struct tog_view *v;
2011 
2012 			/*
2013 			 * When we quit, scroll the screen up a single line
2014 			 * so we don't lose any information.
2015 			 */
2016 			TAILQ_FOREACH(v, &views, entry) {
2017 				wmove(v->window, 0, 0);
2018 				wdeleteln(v->window);
2019 				wnoutrefresh(v->window);
2020 				if (v->child && !view_is_fullscreen(v)) {
2021 					wmove(v->child->window, 0, 0);
2022 					wdeleteln(v->child->window);
2023 					wnoutrefresh(v->child->window);
2024 				}
2025 			}
2026 			doupdate();
2027 		}
2028 
2029 		if (view->dying) {
2030 			struct tog_view *v, *prev = NULL;
2031 
2032 			if (view_is_parent_view(view))
2033 				prev = TAILQ_PREV(view, tog_view_list_head,
2034 				    entry);
2035 			else if (view->parent)
2036 				prev = view->parent;
2037 
2038 			if (view->parent) {
2039 				view->parent->child = NULL;
2040 				view->parent->focus_child = 0;
2041 				/* Restore fullscreen line height. */
2042 				view->parent->nlines = view->parent->lines;
2043 				err = view_resize(view->parent);
2044 				if (err)
2045 					break;
2046 				/* Make resized splits persist. */
2047 				view_transfer_size(view->parent, view);
2048 			} else
2049 				TAILQ_REMOVE(&views, view, entry);
2050 
2051 			err = view_close(view);
2052 			if (err)
2053 				goto done;
2054 
2055 			view = NULL;
2056 			TAILQ_FOREACH(v, &views, entry) {
2057 				if (v->focussed)
2058 					break;
2059 			}
2060 			if (view == NULL && new_view == NULL) {
2061 				/* No view has focus. Try to pick one. */
2062 				if (prev)
2063 					view = prev;
2064 				else if (!TAILQ_EMPTY(&views)) {
2065 					view = TAILQ_LAST(&views,
2066 					    tog_view_list_head);
2067 				}
2068 				if (view) {
2069 					if (view->focus_child) {
2070 						view->child->focussed = 1;
2071 						view = view->child;
2072 					} else
2073 						view->focussed = 1;
2074 				}
2075 			}
2076 		}
2077 		if (new_view) {
2078 			struct tog_view *v, *t;
2079 			/* Only allow one parent view per type. */
2080 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2081 				if (v->type != new_view->type)
2082 					continue;
2083 				TAILQ_REMOVE(&views, v, entry);
2084 				err = view_close(v);
2085 				if (err)
2086 					goto done;
2087 				break;
2088 			}
2089 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2090 			view = new_view;
2091 		}
2092 		if (view && !done) {
2093 			if (view_is_parent_view(view)) {
2094 				if (view->child && view->child->focussed)
2095 					view = view->child;
2096 			} else {
2097 				if (view->parent && view->parent->focussed)
2098 					view = view->parent;
2099 			}
2100 			show_panel(view->panel);
2101 			if (view->child && view_is_splitscreen(view->child))
2102 				show_panel(view->child->panel);
2103 			if (view->parent && view_is_splitscreen(view)) {
2104 				err = view->parent->show(view->parent);
2105 				if (err)
2106 					goto done;
2107 			}
2108 			err = view->show(view);
2109 			if (err)
2110 				goto done;
2111 			if (view->child) {
2112 				err = view->child->show(view->child);
2113 				if (err)
2114 					goto done;
2115 			}
2116 			update_panels();
2117 			doupdate();
2118 		}
2119 	}
2120 done:
2121 	while (!TAILQ_EMPTY(&views)) {
2122 		const struct got_error *close_err;
2123 		view = TAILQ_FIRST(&views);
2124 		TAILQ_REMOVE(&views, view, entry);
2125 		close_err = view_close(view);
2126 		if (close_err && err == NULL)
2127 			err = close_err;
2128 	}
2129 
2130 	errcode = pthread_mutex_unlock(&tog_mutex);
2131 	if (errcode && err == NULL)
2132 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2133 
2134 	return err;
2135 }
2136 
2137 __dead static void
2138 usage_log(void)
2139 {
2140 	endwin();
2141 	fprintf(stderr,
2142 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2143 	    getprogname());
2144 	exit(1);
2145 }
2146 
2147 /* Create newly allocated wide-character string equivalent to a byte string. */
2148 static const struct got_error *
2149 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2150 {
2151 	char *vis = NULL;
2152 	const struct got_error *err = NULL;
2153 
2154 	*ws = NULL;
2155 	*wlen = mbstowcs(NULL, s, 0);
2156 	if (*wlen == (size_t)-1) {
2157 		int vislen;
2158 		if (errno != EILSEQ)
2159 			return got_error_from_errno("mbstowcs");
2160 
2161 		/* byte string invalid in current encoding; try to "fix" it */
2162 		err = got_mbsavis(&vis, &vislen, s);
2163 		if (err)
2164 			return err;
2165 		*wlen = mbstowcs(NULL, vis, 0);
2166 		if (*wlen == (size_t)-1) {
2167 			err = got_error_from_errno("mbstowcs"); /* give up */
2168 			goto done;
2169 		}
2170 	}
2171 
2172 	*ws = calloc(*wlen + 1, sizeof(**ws));
2173 	if (*ws == NULL) {
2174 		err = got_error_from_errno("calloc");
2175 		goto done;
2176 	}
2177 
2178 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2179 		err = got_error_from_errno("mbstowcs");
2180 done:
2181 	free(vis);
2182 	if (err) {
2183 		free(*ws);
2184 		*ws = NULL;
2185 		*wlen = 0;
2186 	}
2187 	return err;
2188 }
2189 
2190 static const struct got_error *
2191 expand_tab(char **ptr, const char *src)
2192 {
2193 	char	*dst;
2194 	size_t	 len, n, idx = 0, sz = 0;
2195 
2196 	*ptr = NULL;
2197 	n = len = strlen(src);
2198 	dst = malloc(n + 1);
2199 	if (dst == NULL)
2200 		return got_error_from_errno("malloc");
2201 
2202 	while (idx < len && src[idx]) {
2203 		const char c = src[idx];
2204 
2205 		if (c == '\t') {
2206 			size_t nb = TABSIZE - sz % TABSIZE;
2207 			char *p;
2208 
2209 			p = realloc(dst, n + nb);
2210 			if (p == NULL) {
2211 				free(dst);
2212 				return got_error_from_errno("realloc");
2213 
2214 			}
2215 			dst = p;
2216 			n += nb;
2217 			memset(dst + sz, ' ', nb);
2218 			sz += nb;
2219 		} else
2220 			dst[sz++] = src[idx];
2221 		++idx;
2222 	}
2223 
2224 	dst[sz] = '\0';
2225 	*ptr = dst;
2226 	return NULL;
2227 }
2228 
2229 /*
2230  * Advance at most n columns from wline starting at offset off.
2231  * Return the index to the first character after the span operation.
2232  * Return the combined column width of all spanned wide characters in
2233  * *rcol.
2234  */
2235 static int
2236 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2237 {
2238 	int width, i, cols = 0;
2239 
2240 	if (n == 0) {
2241 		*rcol = cols;
2242 		return off;
2243 	}
2244 
2245 	for (i = off; wline[i] != L'\0'; ++i) {
2246 		if (wline[i] == L'\t')
2247 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2248 		else
2249 			width = wcwidth(wline[i]);
2250 
2251 		if (width == -1) {
2252 			width = 1;
2253 			wline[i] = L'.';
2254 		}
2255 
2256 		if (cols + width > n)
2257 			break;
2258 		cols += width;
2259 	}
2260 
2261 	*rcol = cols;
2262 	return i;
2263 }
2264 
2265 /*
2266  * Format a line for display, ensuring that it won't overflow a width limit.
2267  * With scrolling, the width returned refers to the scrolled version of the
2268  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2269  */
2270 static const struct got_error *
2271 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2272     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2273 {
2274 	const struct got_error *err = NULL;
2275 	int cols;
2276 	wchar_t *wline = NULL;
2277 	char *exstr = NULL;
2278 	size_t wlen;
2279 	int i, scrollx;
2280 
2281 	*wlinep = NULL;
2282 	*widthp = 0;
2283 
2284 	if (expand) {
2285 		err = expand_tab(&exstr, line);
2286 		if (err)
2287 			return err;
2288 	}
2289 
2290 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2291 	free(exstr);
2292 	if (err)
2293 		return err;
2294 
2295 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2296 
2297 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2298 		wline[wlen - 1] = L'\0';
2299 		wlen--;
2300 	}
2301 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2302 		wline[wlen - 1] = L'\0';
2303 		wlen--;
2304 	}
2305 
2306 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2307 	wline[i] = L'\0';
2308 
2309 	if (widthp)
2310 		*widthp = cols;
2311 	if (scrollxp)
2312 		*scrollxp = scrollx;
2313 	if (err)
2314 		free(wline);
2315 	else
2316 		*wlinep = wline;
2317 	return err;
2318 }
2319 
2320 static const struct got_error*
2321 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2322     struct got_object_id *id, struct got_repository *repo)
2323 {
2324 	static const struct got_error *err = NULL;
2325 	struct got_reflist_entry *re;
2326 	char *s;
2327 	const char *name;
2328 
2329 	*refs_str = NULL;
2330 
2331 	if (refs == NULL)
2332 		return NULL;
2333 
2334 	TAILQ_FOREACH(re, refs, entry) {
2335 		struct got_tag_object *tag = NULL;
2336 		struct got_object_id *ref_id;
2337 		int cmp;
2338 
2339 		name = got_ref_get_name(re->ref);
2340 		if (strcmp(name, GOT_REF_HEAD) == 0)
2341 			continue;
2342 		if (strncmp(name, "refs/", 5) == 0)
2343 			name += 5;
2344 		if (strncmp(name, "got/", 4) == 0)
2345 			continue;
2346 		if (strncmp(name, "heads/", 6) == 0)
2347 			name += 6;
2348 		if (strncmp(name, "remotes/", 8) == 0) {
2349 			name += 8;
2350 			s = strstr(name, "/" GOT_REF_HEAD);
2351 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2352 				continue;
2353 		}
2354 		err = got_ref_resolve(&ref_id, repo, re->ref);
2355 		if (err)
2356 			break;
2357 		if (strncmp(name, "tags/", 5) == 0) {
2358 			err = got_object_open_as_tag(&tag, repo, ref_id);
2359 			if (err) {
2360 				if (err->code != GOT_ERR_OBJ_TYPE) {
2361 					free(ref_id);
2362 					break;
2363 				}
2364 				/* Ref points at something other than a tag. */
2365 				err = NULL;
2366 				tag = NULL;
2367 			}
2368 		}
2369 		cmp = got_object_id_cmp(tag ?
2370 		    got_object_tag_get_object_id(tag) : ref_id, id);
2371 		free(ref_id);
2372 		if (tag)
2373 			got_object_tag_close(tag);
2374 		if (cmp != 0)
2375 			continue;
2376 		s = *refs_str;
2377 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2378 		    s ? ", " : "", name) == -1) {
2379 			err = got_error_from_errno("asprintf");
2380 			free(s);
2381 			*refs_str = NULL;
2382 			break;
2383 		}
2384 		free(s);
2385 	}
2386 
2387 	return err;
2388 }
2389 
2390 static const struct got_error *
2391 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2392     int col_tab_align)
2393 {
2394 	char *smallerthan;
2395 
2396 	smallerthan = strchr(author, '<');
2397 	if (smallerthan && smallerthan[1] != '\0')
2398 		author = smallerthan + 1;
2399 	author[strcspn(author, "@>")] = '\0';
2400 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2401 	    col_tab_align, 0);
2402 }
2403 
2404 static const struct got_error *
2405 draw_commit(struct tog_view *view, struct commit_queue_entry *entry,
2406     const size_t date_display_cols, int author_display_cols)
2407 {
2408 	struct tog_log_view_state *s = &view->state.log;
2409 	const struct got_error *err = NULL;
2410 	struct got_commit_object *commit = entry->commit;
2411 	struct got_object_id *id = entry->id;
2412 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2413 	char *refs_str = NULL;
2414 	char *logmsg0 = NULL, *logmsg = NULL;
2415 	char *author = NULL;
2416 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2417 	int author_width, refstr_width, logmsg_width;
2418 	char *newline, *line = NULL;
2419 	int col, limit, scrollx, logmsg_x;
2420 	const int avail = view->ncols, marker_column = author_display_cols + 1;
2421 	struct tm tm;
2422 	time_t committer_time;
2423 	struct tog_color *tc;
2424 	struct got_reflist_head *refs;
2425 
2426 	committer_time = got_object_commit_get_committer_time(commit);
2427 	if (gmtime_r(&committer_time, &tm) == NULL)
2428 		return got_error_from_errno("gmtime_r");
2429 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2430 		return got_error(GOT_ERR_NO_SPACE);
2431 
2432 	if (avail <= date_display_cols)
2433 		limit = MIN(sizeof(datebuf) - 1, avail);
2434 	else
2435 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2436 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2437 	if (tc)
2438 		wattr_on(view->window,
2439 		    COLOR_PAIR(tc->colorpair), NULL);
2440 	waddnstr(view->window, datebuf, limit);
2441 	if (tc)
2442 		wattr_off(view->window,
2443 		    COLOR_PAIR(tc->colorpair), NULL);
2444 	col = limit;
2445 	if (col > avail)
2446 		goto done;
2447 
2448 	if (avail >= 120) {
2449 		char *id_str;
2450 		err = got_object_id_str(&id_str, id);
2451 		if (err)
2452 			goto done;
2453 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2454 		if (tc)
2455 			wattr_on(view->window,
2456 			    COLOR_PAIR(tc->colorpair), NULL);
2457 		wprintw(view->window, "%.8s ", id_str);
2458 		if (tc)
2459 			wattr_off(view->window,
2460 			    COLOR_PAIR(tc->colorpair), NULL);
2461 		free(id_str);
2462 		col += 9;
2463 		if (col > avail)
2464 			goto done;
2465 	}
2466 
2467 	if (s->use_committer)
2468 		author = strdup(got_object_commit_get_committer(commit));
2469 	else
2470 		author = strdup(got_object_commit_get_author(commit));
2471 	if (author == NULL) {
2472 		err = got_error_from_errno("strdup");
2473 		goto done;
2474 	}
2475 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2476 	if (err)
2477 		goto done;
2478 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2479 	if (tc)
2480 		wattr_on(view->window,
2481 		    COLOR_PAIR(tc->colorpair), NULL);
2482 	waddwstr(view->window, wauthor);
2483 	col += author_width;
2484 	while (col < avail && author_width < author_display_cols + 2) {
2485 		if (tog_base_commit.id != NULL &&
2486 		    author_width == marker_column &&
2487 		    entry->idx == tog_base_commit.idx)
2488 			waddch(view->window, tog_base_commit.marker);
2489 		else
2490 			waddch(view->window, ' ');
2491 		col++;
2492 		author_width++;
2493 	}
2494 	if (tc)
2495 		wattr_off(view->window,
2496 		    COLOR_PAIR(tc->colorpair), NULL);
2497 	if (col > avail)
2498 		goto done;
2499 
2500 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2501 	if (err)
2502 		goto done;
2503 	logmsg = logmsg0;
2504 	while (*logmsg == '\n')
2505 		logmsg++;
2506 	newline = strchr(logmsg, '\n');
2507 	if (newline)
2508 		*newline = '\0';
2509 
2510 	limit = avail - col;
2511 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2512 		limit--;	/* for the border */
2513 
2514 	/* Prepend reference labels to log message if possible .*/
2515 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2516 	err = build_refs_str(&refs_str, refs, id, s->repo);
2517 	if (err)
2518 		goto done;
2519 	if (refs_str) {
2520 		char *rs;
2521 
2522 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2523 			err = got_error_from_errno("asprintf");
2524 			goto done;
2525 		}
2526 		err = format_line(&wrefstr, &refstr_width,
2527 		    &scrollx, rs, view->x, limit, col, 1);
2528 		free(rs);
2529 		if (err)
2530 			goto done;
2531 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2532 		if (tc)
2533 			wattr_on(view->window,
2534 			    COLOR_PAIR(tc->colorpair), NULL);
2535 		waddwstr(view->window, &wrefstr[scrollx]);
2536 		if (tc)
2537 			wattr_off(view->window,
2538 			    COLOR_PAIR(tc->colorpair), NULL);
2539 		col += MAX(refstr_width, 0);
2540 		if (col > avail)
2541 			goto done;
2542 
2543 		if (col < avail) {
2544 			waddch(view->window, ' ');
2545 			col++;
2546 		}
2547 
2548 		if (refstr_width > 0)
2549 			logmsg_x = 0;
2550 		else {
2551 			int unscrolled_refstr_width;
2552 			size_t len = wcslen(wrefstr);
2553 
2554 			/*
2555 			 * No need to check for -1 return value here since
2556 			 * unprintables have been replaced by span_wline().
2557 			 */
2558 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2559 			unscrolled_refstr_width += 1; /* trailing space */
2560 			logmsg_x = view->x - unscrolled_refstr_width;
2561 		}
2562 
2563 		limit = avail - col;
2564 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2565 			limit--;	/* for the border */
2566 	} else
2567 		logmsg_x = view->x;
2568 
2569 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2570 	    limit, col, 1);
2571 	if (err)
2572 		goto done;
2573 	waddwstr(view->window, &wlogmsg[scrollx]);
2574 	col += MAX(logmsg_width, 0);
2575 	while (col < avail) {
2576 		waddch(view->window, ' ');
2577 		col++;
2578 	}
2579 done:
2580 	free(logmsg0);
2581 	free(wlogmsg);
2582 	free(wrefstr);
2583 	free(refs_str);
2584 	free(author);
2585 	free(wauthor);
2586 	free(line);
2587 	return err;
2588 }
2589 
2590 static struct commit_queue_entry *
2591 alloc_commit_queue_entry(struct got_commit_object *commit,
2592     struct got_object_id *id)
2593 {
2594 	struct commit_queue_entry *entry;
2595 	struct got_object_id *dup;
2596 
2597 	entry = calloc(1, sizeof(*entry));
2598 	if (entry == NULL)
2599 		return NULL;
2600 
2601 	dup = got_object_id_dup(id);
2602 	if (dup == NULL) {
2603 		free(entry);
2604 		return NULL;
2605 	}
2606 
2607 	entry->id = dup;
2608 	entry->commit = commit;
2609 	return entry;
2610 }
2611 
2612 static void
2613 pop_commit(struct commit_queue *commits)
2614 {
2615 	struct commit_queue_entry *entry;
2616 
2617 	entry = TAILQ_FIRST(&commits->head);
2618 	TAILQ_REMOVE(&commits->head, entry, entry);
2619 	got_object_commit_close(entry->commit);
2620 	commits->ncommits--;
2621 	free(entry->id);
2622 	free(entry);
2623 }
2624 
2625 static void
2626 free_commits(struct commit_queue *commits)
2627 {
2628 	while (!TAILQ_EMPTY(&commits->head))
2629 		pop_commit(commits);
2630 }
2631 
2632 static const struct got_error *
2633 match_commit(int *have_match, struct got_object_id *id,
2634     struct got_commit_object *commit, regex_t *regex)
2635 {
2636 	const struct got_error *err = NULL;
2637 	regmatch_t regmatch;
2638 	char *id_str = NULL, *logmsg = NULL;
2639 
2640 	*have_match = 0;
2641 
2642 	err = got_object_id_str(&id_str, id);
2643 	if (err)
2644 		return err;
2645 
2646 	err = got_object_commit_get_logmsg(&logmsg, commit);
2647 	if (err)
2648 		goto done;
2649 
2650 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2651 	    &regmatch, 0) == 0 ||
2652 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2653 	    &regmatch, 0) == 0 ||
2654 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2655 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2656 		*have_match = 1;
2657 done:
2658 	free(id_str);
2659 	free(logmsg);
2660 	return err;
2661 }
2662 
2663 static const struct got_error *
2664 queue_commits(struct tog_log_thread_args *a)
2665 {
2666 	const struct got_error *err = NULL;
2667 
2668 	/*
2669 	 * We keep all commits open throughout the lifetime of the log
2670 	 * view in order to avoid having to re-fetch commits from disk
2671 	 * while updating the display.
2672 	 */
2673 	do {
2674 		struct got_object_id id;
2675 		struct got_commit_object *commit;
2676 		struct commit_queue_entry *entry;
2677 		int limit_match = 0;
2678 		int errcode;
2679 
2680 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2681 		    NULL, NULL);
2682 		if (err)
2683 			break;
2684 
2685 		err = got_object_open_as_commit(&commit, a->repo, &id);
2686 		if (err)
2687 			break;
2688 		entry = alloc_commit_queue_entry(commit, &id);
2689 		if (entry == NULL) {
2690 			err = got_error_from_errno("alloc_commit_queue_entry");
2691 			break;
2692 		}
2693 
2694 		errcode = pthread_mutex_lock(&tog_mutex);
2695 		if (errcode) {
2696 			err = got_error_set_errno(errcode,
2697 			    "pthread_mutex_lock");
2698 			break;
2699 		}
2700 
2701 		entry->idx = a->real_commits->ncommits;
2702 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2703 		a->real_commits->ncommits++;
2704 
2705 		if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2706 		    got_object_id_cmp(&id, tog_base_commit.id) == 0)
2707 			tog_base_commit.idx = entry->idx;
2708 
2709 		if (*a->limiting) {
2710 			err = match_commit(&limit_match, &id, commit,
2711 			    a->limit_regex);
2712 			if (err)
2713 				break;
2714 
2715 			if (limit_match) {
2716 				struct commit_queue_entry *matched;
2717 
2718 				matched = alloc_commit_queue_entry(
2719 				    entry->commit, entry->id);
2720 				if (matched == NULL) {
2721 					err = got_error_from_errno(
2722 					    "alloc_commit_queue_entry");
2723 					break;
2724 				}
2725 				matched->commit = entry->commit;
2726 				got_object_commit_retain(entry->commit);
2727 
2728 				matched->idx = a->limit_commits->ncommits;
2729 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2730 				    matched, entry);
2731 				a->limit_commits->ncommits++;
2732 			}
2733 
2734 			/*
2735 			 * This is how we signal log_thread() that we
2736 			 * have found a match, and that it should be
2737 			 * counted as a new entry for the view.
2738 			 */
2739 			a->limit_match = limit_match;
2740 		}
2741 
2742 		if (*a->searching == TOG_SEARCH_FORWARD &&
2743 		    !*a->search_next_done) {
2744 			int have_match;
2745 			err = match_commit(&have_match, &id, commit, a->regex);
2746 			if (err)
2747 				break;
2748 
2749 			if (*a->limiting) {
2750 				if (limit_match && have_match)
2751 					*a->search_next_done =
2752 					    TOG_SEARCH_HAVE_MORE;
2753 			} else if (have_match)
2754 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2755 		}
2756 
2757 		errcode = pthread_mutex_unlock(&tog_mutex);
2758 		if (errcode && err == NULL)
2759 			err = got_error_set_errno(errcode,
2760 			    "pthread_mutex_unlock");
2761 		if (err)
2762 			break;
2763 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2764 
2765 	return err;
2766 }
2767 
2768 static void
2769 select_commit(struct tog_log_view_state *s)
2770 {
2771 	struct commit_queue_entry *entry;
2772 	int ncommits = 0;
2773 
2774 	entry = s->first_displayed_entry;
2775 	while (entry) {
2776 		if (ncommits == s->selected) {
2777 			s->selected_entry = entry;
2778 			break;
2779 		}
2780 		entry = TAILQ_NEXT(entry, entry);
2781 		ncommits++;
2782 	}
2783 }
2784 
2785 static const struct got_error *
2786 draw_commits(struct tog_view *view)
2787 {
2788 	const struct got_error *err = NULL;
2789 	struct tog_log_view_state *s = &view->state.log;
2790 	struct commit_queue_entry *entry = s->selected_entry;
2791 	int limit = view->nlines;
2792 	int width;
2793 	int ncommits, author_cols = 4, refstr_cols;
2794 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2795 	char *refs_str = NULL;
2796 	wchar_t *wline;
2797 	struct tog_color *tc;
2798 	static const size_t date_display_cols = 12;
2799 	struct got_reflist_head *refs;
2800 
2801 	if (view_is_hsplit_top(view))
2802 		--limit;  /* account for border */
2803 
2804 	if (s->selected_entry &&
2805 	    !(view->searching && view->search_next_done == 0)) {
2806 		err = got_object_id_str(&id_str, s->selected_entry->id);
2807 		if (err)
2808 			return err;
2809 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2810 		    s->selected_entry->id);
2811 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2812 		    s->repo);
2813 		if (err)
2814 			goto done;
2815 	}
2816 
2817 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2818 		halfdelay(10); /* disable fast refresh */
2819 
2820 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2821 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2822 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2823 		    (view->searching && !view->search_next_done) ?
2824 		    "searching..." : "loading...") == -1) {
2825 			err = got_error_from_errno("asprintf");
2826 			goto done;
2827 		}
2828 	} else {
2829 		const char *search_str = NULL;
2830 		const char *limit_str = NULL;
2831 
2832 		if (view->searching) {
2833 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2834 				search_str = "no more matches";
2835 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2836 				search_str = "no matches found";
2837 			else if (!view->search_next_done)
2838 				search_str = "searching...";
2839 		}
2840 
2841 		if (s->limit_view && s->commits->ncommits == 0)
2842 			limit_str = "no matches found";
2843 
2844 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2845 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2846 		    search_str ? search_str : (refs_str ? refs_str : ""),
2847 		    limit_str ? limit_str : "") == -1) {
2848 			err = got_error_from_errno("asprintf");
2849 			goto done;
2850 		}
2851 	}
2852 
2853 	free(refs_str);
2854 	refs_str = NULL;
2855 
2856 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2857 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2858 		    "........................................",
2859 		    s->in_repo_path, ncommits_str) == -1) {
2860 			err = got_error_from_errno("asprintf");
2861 			header = NULL;
2862 			goto done;
2863 		}
2864 	} else if (asprintf(&header, "commit %s%s",
2865 	    id_str ? id_str : "........................................",
2866 	    ncommits_str) == -1) {
2867 		err = got_error_from_errno("asprintf");
2868 		header = NULL;
2869 		goto done;
2870 	}
2871 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2872 	if (err)
2873 		goto done;
2874 
2875 	werase(view->window);
2876 
2877 	if (view_needs_focus_indication(view))
2878 		wstandout(view->window);
2879 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2880 	if (tc)
2881 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2882 	waddwstr(view->window, wline);
2883 	while (width < view->ncols) {
2884 		waddch(view->window, ' ');
2885 		width++;
2886 	}
2887 	if (tc)
2888 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2889 	if (view_needs_focus_indication(view))
2890 		wstandend(view->window);
2891 	free(wline);
2892 	if (limit <= 1)
2893 		goto done;
2894 
2895 	/* Grow author column size if necessary, and set view->maxx. */
2896 	entry = s->first_displayed_entry;
2897 	ncommits = 0;
2898 	view->maxx = 0;
2899 	while (entry) {
2900 		struct got_commit_object *c = entry->commit;
2901 		char *author, *eol, *msg, *msg0;
2902 		wchar_t *wauthor, *wmsg;
2903 		int width;
2904 		if (ncommits >= limit - 1)
2905 			break;
2906 		if (s->use_committer)
2907 			author = strdup(got_object_commit_get_committer(c));
2908 		else
2909 			author = strdup(got_object_commit_get_author(c));
2910 		if (author == NULL) {
2911 			err = got_error_from_errno("strdup");
2912 			goto done;
2913 		}
2914 		err = format_author(&wauthor, &width, author, COLS,
2915 		    date_display_cols);
2916 		if (author_cols < width)
2917 			author_cols = width;
2918 		free(wauthor);
2919 		free(author);
2920 		if (err)
2921 			goto done;
2922 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2923 		    entry->id);
2924 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2925 		if (err)
2926 			goto done;
2927 		if (refs_str) {
2928 			wchar_t *ws;
2929 			err = format_line(&ws, &width, NULL, refs_str,
2930 			    0, INT_MAX, date_display_cols + author_cols, 0);
2931 			free(ws);
2932 			free(refs_str);
2933 			refs_str = NULL;
2934 			if (err)
2935 				goto done;
2936 			refstr_cols = width + 3; /* account for [ ] + space */
2937 		} else
2938 			refstr_cols = 0;
2939 		err = got_object_commit_get_logmsg(&msg0, c);
2940 		if (err)
2941 			goto done;
2942 		msg = msg0;
2943 		while (*msg == '\n')
2944 			++msg;
2945 		if ((eol = strchr(msg, '\n')))
2946 			*eol = '\0';
2947 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2948 		    date_display_cols + author_cols + refstr_cols, 0);
2949 		if (err)
2950 			goto done;
2951 		view->maxx = MAX(view->maxx, width + refstr_cols);
2952 		free(msg0);
2953 		free(wmsg);
2954 		ncommits++;
2955 		entry = TAILQ_NEXT(entry, entry);
2956 	}
2957 
2958 	entry = s->first_displayed_entry;
2959 	s->last_displayed_entry = s->first_displayed_entry;
2960 	ncommits = 0;
2961 	while (entry) {
2962 		if (ncommits >= limit - 1)
2963 			break;
2964 		if (ncommits == s->selected)
2965 			wstandout(view->window);
2966 		err = draw_commit(view, entry, date_display_cols, author_cols);
2967 		if (ncommits == s->selected)
2968 			wstandend(view->window);
2969 		if (err)
2970 			goto done;
2971 		ncommits++;
2972 		s->last_displayed_entry = entry;
2973 		entry = TAILQ_NEXT(entry, entry);
2974 	}
2975 
2976 	view_border(view);
2977 done:
2978 	free(id_str);
2979 	free(refs_str);
2980 	free(ncommits_str);
2981 	free(header);
2982 	return err;
2983 }
2984 
2985 static void
2986 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2987 {
2988 	struct commit_queue_entry *entry;
2989 	int nscrolled = 0;
2990 
2991 	entry = TAILQ_FIRST(&s->commits->head);
2992 	if (s->first_displayed_entry == entry)
2993 		return;
2994 
2995 	entry = s->first_displayed_entry;
2996 	while (entry && nscrolled < maxscroll) {
2997 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2998 		if (entry) {
2999 			s->first_displayed_entry = entry;
3000 			nscrolled++;
3001 		}
3002 	}
3003 }
3004 
3005 static const struct got_error *
3006 trigger_log_thread(struct tog_view *view, int wait)
3007 {
3008 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3009 	int errcode;
3010 
3011 	if (!using_mock_io)
3012 		halfdelay(1); /* fast refresh while loading commits */
3013 
3014 	while (!ta->log_complete && !tog_thread_error &&
3015 	    (ta->commits_needed > 0 || ta->load_all)) {
3016 		/* Wake the log thread. */
3017 		errcode = pthread_cond_signal(&ta->need_commits);
3018 		if (errcode)
3019 			return got_error_set_errno(errcode,
3020 			    "pthread_cond_signal");
3021 
3022 		/*
3023 		 * The mutex will be released while the view loop waits
3024 		 * in wgetch(), at which time the log thread will run.
3025 		 */
3026 		if (!wait)
3027 			break;
3028 
3029 		/* Display progress update in log view. */
3030 		show_log_view(view);
3031 		update_panels();
3032 		doupdate();
3033 
3034 		/* Wait right here while next commit is being loaded. */
3035 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3036 		if (errcode)
3037 			return got_error_set_errno(errcode,
3038 			    "pthread_cond_wait");
3039 
3040 		/* Display progress update in log view. */
3041 		show_log_view(view);
3042 		update_panels();
3043 		doupdate();
3044 	}
3045 
3046 	return NULL;
3047 }
3048 
3049 static const struct got_error *
3050 request_log_commits(struct tog_view *view)
3051 {
3052 	struct tog_log_view_state	*state = &view->state.log;
3053 	const struct got_error		*err = NULL;
3054 
3055 	if (state->thread_args.log_complete)
3056 		return NULL;
3057 
3058 	state->thread_args.commits_needed += view->nscrolled;
3059 	err = trigger_log_thread(view, 1);
3060 	view->nscrolled = 0;
3061 
3062 	return err;
3063 }
3064 
3065 static const struct got_error *
3066 log_scroll_down(struct tog_view *view, int maxscroll)
3067 {
3068 	struct tog_log_view_state *s = &view->state.log;
3069 	const struct got_error *err = NULL;
3070 	struct commit_queue_entry *pentry;
3071 	int nscrolled = 0, ncommits_needed;
3072 
3073 	if (s->last_displayed_entry == NULL)
3074 		return NULL;
3075 
3076 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3077 	if (s->commits->ncommits < ncommits_needed &&
3078 	    !s->thread_args.log_complete) {
3079 		/*
3080 		 * Ask the log thread for required amount of commits.
3081 		 */
3082 		s->thread_args.commits_needed +=
3083 		    ncommits_needed - s->commits->ncommits;
3084 		err = trigger_log_thread(view, 1);
3085 		if (err)
3086 			return err;
3087 	}
3088 
3089 	do {
3090 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3091 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3092 			break;
3093 
3094 		s->last_displayed_entry = pentry ?
3095 		    pentry : s->last_displayed_entry;
3096 
3097 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3098 		if (pentry == NULL)
3099 			break;
3100 		s->first_displayed_entry = pentry;
3101 	} while (++nscrolled < maxscroll);
3102 
3103 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3104 		view->nscrolled += nscrolled;
3105 	else
3106 		view->nscrolled = 0;
3107 
3108 	return err;
3109 }
3110 
3111 static const struct got_error *
3112 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3113     struct got_commit_object *commit, struct got_object_id *commit_id,
3114     struct tog_view *log_view, struct got_repository *repo)
3115 {
3116 	const struct got_error *err;
3117 	struct got_object_qid *parent_id;
3118 	struct tog_view *diff_view;
3119 
3120 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3121 	if (diff_view == NULL)
3122 		return got_error_from_errno("view_open");
3123 
3124 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3125 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3126 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3127 	if (err == NULL)
3128 		*new_view = diff_view;
3129 	return err;
3130 }
3131 
3132 static const struct got_error *
3133 tree_view_visit_subtree(struct tog_tree_view_state *s,
3134     struct got_tree_object *subtree)
3135 {
3136 	struct tog_parent_tree *parent;
3137 
3138 	parent = calloc(1, sizeof(*parent));
3139 	if (parent == NULL)
3140 		return got_error_from_errno("calloc");
3141 
3142 	parent->tree = s->tree;
3143 	parent->first_displayed_entry = s->first_displayed_entry;
3144 	parent->selected_entry = s->selected_entry;
3145 	parent->selected = s->selected;
3146 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3147 	s->tree = subtree;
3148 	s->selected = 0;
3149 	s->first_displayed_entry = NULL;
3150 	return NULL;
3151 }
3152 
3153 static const struct got_error *
3154 tree_view_walk_path(struct tog_tree_view_state *s,
3155     struct got_commit_object *commit, const char *path)
3156 {
3157 	const struct got_error *err = NULL;
3158 	struct got_tree_object *tree = NULL;
3159 	const char *p;
3160 	char *slash, *subpath = NULL;
3161 
3162 	/* Walk the path and open corresponding tree objects. */
3163 	p = path;
3164 	while (*p) {
3165 		struct got_tree_entry *te;
3166 		struct got_object_id *tree_id;
3167 		char *te_name;
3168 
3169 		while (p[0] == '/')
3170 			p++;
3171 
3172 		/* Ensure the correct subtree entry is selected. */
3173 		slash = strchr(p, '/');
3174 		if (slash == NULL)
3175 			te_name = strdup(p);
3176 		else
3177 			te_name = strndup(p, slash - p);
3178 		if (te_name == NULL) {
3179 			err = got_error_from_errno("strndup");
3180 			break;
3181 		}
3182 		te = got_object_tree_find_entry(s->tree, te_name);
3183 		if (te == NULL) {
3184 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3185 			free(te_name);
3186 			break;
3187 		}
3188 		free(te_name);
3189 		s->first_displayed_entry = s->selected_entry = te;
3190 
3191 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3192 			break; /* jump to this file's entry */
3193 
3194 		slash = strchr(p, '/');
3195 		if (slash)
3196 			subpath = strndup(path, slash - path);
3197 		else
3198 			subpath = strdup(path);
3199 		if (subpath == NULL) {
3200 			err = got_error_from_errno("strdup");
3201 			break;
3202 		}
3203 
3204 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3205 		    subpath);
3206 		if (err)
3207 			break;
3208 
3209 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3210 		free(tree_id);
3211 		if (err)
3212 			break;
3213 
3214 		err = tree_view_visit_subtree(s, tree);
3215 		if (err) {
3216 			got_object_tree_close(tree);
3217 			break;
3218 		}
3219 		if (slash == NULL)
3220 			break;
3221 		free(subpath);
3222 		subpath = NULL;
3223 		p = slash;
3224 	}
3225 
3226 	free(subpath);
3227 	return err;
3228 }
3229 
3230 static const struct got_error *
3231 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3232     struct commit_queue_entry *entry, const char *path,
3233     const char *head_ref_name, struct got_repository *repo)
3234 {
3235 	const struct got_error *err = NULL;
3236 	struct tog_tree_view_state *s;
3237 	struct tog_view *tree_view;
3238 
3239 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3240 	if (tree_view == NULL)
3241 		return got_error_from_errno("view_open");
3242 
3243 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3244 	if (err)
3245 		return err;
3246 	s = &tree_view->state.tree;
3247 
3248 	*new_view = tree_view;
3249 
3250 	if (got_path_is_root_dir(path))
3251 		return NULL;
3252 
3253 	return tree_view_walk_path(s, entry->commit, path);
3254 }
3255 
3256 static const struct got_error *
3257 block_signals_used_by_main_thread(void)
3258 {
3259 	sigset_t sigset;
3260 	int errcode;
3261 
3262 	if (sigemptyset(&sigset) == -1)
3263 		return got_error_from_errno("sigemptyset");
3264 
3265 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3266 	if (sigaddset(&sigset, SIGWINCH) == -1)
3267 		return got_error_from_errno("sigaddset");
3268 	if (sigaddset(&sigset, SIGCONT) == -1)
3269 		return got_error_from_errno("sigaddset");
3270 	if (sigaddset(&sigset, SIGINT) == -1)
3271 		return got_error_from_errno("sigaddset");
3272 	if (sigaddset(&sigset, SIGTERM) == -1)
3273 		return got_error_from_errno("sigaddset");
3274 
3275 	/* ncurses handles SIGTSTP */
3276 	if (sigaddset(&sigset, SIGTSTP) == -1)
3277 		return got_error_from_errno("sigaddset");
3278 
3279 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3280 	if (errcode)
3281 		return got_error_set_errno(errcode, "pthread_sigmask");
3282 
3283 	return NULL;
3284 }
3285 
3286 static void *
3287 log_thread(void *arg)
3288 {
3289 	const struct got_error *err = NULL;
3290 	int errcode = 0;
3291 	struct tog_log_thread_args *a = arg;
3292 	int done = 0;
3293 
3294 	/*
3295 	 * Sync startup with main thread such that we begin our
3296 	 * work once view_input() has released the mutex.
3297 	 */
3298 	errcode = pthread_mutex_lock(&tog_mutex);
3299 	if (errcode) {
3300 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3301 		return (void *)err;
3302 	}
3303 
3304 	err = block_signals_used_by_main_thread();
3305 	if (err) {
3306 		pthread_mutex_unlock(&tog_mutex);
3307 		goto done;
3308 	}
3309 
3310 	while (!done && !err && !tog_fatal_signal_received()) {
3311 		errcode = pthread_mutex_unlock(&tog_mutex);
3312 		if (errcode) {
3313 			err = got_error_set_errno(errcode,
3314 			    "pthread_mutex_unlock");
3315 			goto done;
3316 		}
3317 		err = queue_commits(a);
3318 		if (err) {
3319 			if (err->code != GOT_ERR_ITER_COMPLETED)
3320 				goto done;
3321 			err = NULL;
3322 			done = 1;
3323 		} else if (a->commits_needed > 0 && !a->load_all) {
3324 			if (*a->limiting) {
3325 				if (a->limit_match)
3326 					a->commits_needed--;
3327 			} else
3328 				a->commits_needed--;
3329 		}
3330 
3331 		errcode = pthread_mutex_lock(&tog_mutex);
3332 		if (errcode) {
3333 			err = got_error_set_errno(errcode,
3334 			    "pthread_mutex_lock");
3335 			goto done;
3336 		} else if (*a->quit)
3337 			done = 1;
3338 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3339 			*a->first_displayed_entry =
3340 			    TAILQ_FIRST(&a->limit_commits->head);
3341 			*a->selected_entry = *a->first_displayed_entry;
3342 		} else if (*a->first_displayed_entry == NULL) {
3343 			*a->first_displayed_entry =
3344 			    TAILQ_FIRST(&a->real_commits->head);
3345 			*a->selected_entry = *a->first_displayed_entry;
3346 		}
3347 
3348 		errcode = pthread_cond_signal(&a->commit_loaded);
3349 		if (errcode) {
3350 			err = got_error_set_errno(errcode,
3351 			    "pthread_cond_signal");
3352 			pthread_mutex_unlock(&tog_mutex);
3353 			goto done;
3354 		}
3355 
3356 		if (done)
3357 			a->commits_needed = 0;
3358 		else {
3359 			if (a->commits_needed == 0 && !a->load_all) {
3360 				errcode = pthread_cond_wait(&a->need_commits,
3361 				    &tog_mutex);
3362 				if (errcode) {
3363 					err = got_error_set_errno(errcode,
3364 					    "pthread_cond_wait");
3365 					pthread_mutex_unlock(&tog_mutex);
3366 					goto done;
3367 				}
3368 				if (*a->quit)
3369 					done = 1;
3370 			}
3371 		}
3372 	}
3373 	a->log_complete = 1;
3374 	errcode = pthread_mutex_unlock(&tog_mutex);
3375 	if (errcode)
3376 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3377 done:
3378 	if (err) {
3379 		tog_thread_error = 1;
3380 		pthread_cond_signal(&a->commit_loaded);
3381 	}
3382 	return (void *)err;
3383 }
3384 
3385 static const struct got_error *
3386 stop_log_thread(struct tog_log_view_state *s)
3387 {
3388 	const struct got_error *err = NULL, *thread_err = NULL;
3389 	int errcode;
3390 
3391 	if (s->thread) {
3392 		s->quit = 1;
3393 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3394 		if (errcode)
3395 			return got_error_set_errno(errcode,
3396 			    "pthread_cond_signal");
3397 		errcode = pthread_mutex_unlock(&tog_mutex);
3398 		if (errcode)
3399 			return got_error_set_errno(errcode,
3400 			    "pthread_mutex_unlock");
3401 		errcode = pthread_join(s->thread, (void **)&thread_err);
3402 		if (errcode)
3403 			return got_error_set_errno(errcode, "pthread_join");
3404 		errcode = pthread_mutex_lock(&tog_mutex);
3405 		if (errcode)
3406 			return got_error_set_errno(errcode,
3407 			    "pthread_mutex_lock");
3408 		s->thread = NULL;
3409 	}
3410 
3411 	if (s->thread_args.repo) {
3412 		err = got_repo_close(s->thread_args.repo);
3413 		s->thread_args.repo = NULL;
3414 	}
3415 
3416 	if (s->thread_args.pack_fds) {
3417 		const struct got_error *pack_err =
3418 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3419 		if (err == NULL)
3420 			err = pack_err;
3421 		s->thread_args.pack_fds = NULL;
3422 	}
3423 
3424 	if (s->thread_args.graph) {
3425 		got_commit_graph_close(s->thread_args.graph);
3426 		s->thread_args.graph = NULL;
3427 	}
3428 
3429 	return err ? err : thread_err;
3430 }
3431 
3432 static const struct got_error *
3433 close_log_view(struct tog_view *view)
3434 {
3435 	const struct got_error *err = NULL;
3436 	struct tog_log_view_state *s = &view->state.log;
3437 	int errcode;
3438 
3439 	err = stop_log_thread(s);
3440 
3441 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3442 	if (errcode && err == NULL)
3443 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3444 
3445 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3446 	if (errcode && err == NULL)
3447 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3448 
3449 	free_commits(&s->limit_commits);
3450 	free_commits(&s->real_commits);
3451 	free(s->in_repo_path);
3452 	s->in_repo_path = NULL;
3453 	free(s->start_id);
3454 	s->start_id = NULL;
3455 	free(s->head_ref_name);
3456 	s->head_ref_name = NULL;
3457 	return err;
3458 }
3459 
3460 /*
3461  * We use two queues to implement the limit feature: first consists of
3462  * commits matching the current limit_regex; second is the real queue
3463  * of all known commits (real_commits). When the user starts limiting,
3464  * we swap queues such that all movement and displaying functionality
3465  * works with very slight change.
3466  */
3467 static const struct got_error *
3468 limit_log_view(struct tog_view *view)
3469 {
3470 	struct tog_log_view_state *s = &view->state.log;
3471 	struct commit_queue_entry *entry;
3472 	struct tog_view	*v = view;
3473 	const struct got_error *err = NULL;
3474 	char pattern[1024];
3475 	int ret;
3476 
3477 	if (view_is_hsplit_top(view))
3478 		v = view->child;
3479 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3480 		v = view->parent;
3481 
3482 	/* Get the pattern */
3483 	wmove(v->window, v->nlines - 1, 0);
3484 	wclrtoeol(v->window);
3485 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3486 	nodelay(v->window, FALSE);
3487 	nocbreak();
3488 	echo();
3489 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3490 	cbreak();
3491 	noecho();
3492 	nodelay(v->window, TRUE);
3493 	if (ret == ERR)
3494 		return NULL;
3495 
3496 	if (*pattern == '\0') {
3497 		/*
3498 		 * Safety measure for the situation where the user
3499 		 * resets limit without previously limiting anything.
3500 		 */
3501 		if (!s->limit_view)
3502 			return NULL;
3503 
3504 		/*
3505 		 * User could have pressed Ctrl+L, which refreshed the
3506 		 * commit queues, it means we can't save previously
3507 		 * (before limit took place) displayed entries,
3508 		 * because they would point to already free'ed memory,
3509 		 * so we are forced to always select first entry of
3510 		 * the queue.
3511 		 */
3512 		s->commits = &s->real_commits;
3513 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3514 		s->selected_entry = s->first_displayed_entry;
3515 		s->selected = 0;
3516 		s->limit_view = 0;
3517 
3518 		return NULL;
3519 	}
3520 
3521 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3522 		return NULL;
3523 
3524 	s->limit_view = 1;
3525 
3526 	/* Clear the screen while loading limit view */
3527 	s->first_displayed_entry = NULL;
3528 	s->last_displayed_entry = NULL;
3529 	s->selected_entry = NULL;
3530 	s->commits = &s->limit_commits;
3531 
3532 	/* Prepare limit queue for new search */
3533 	free_commits(&s->limit_commits);
3534 	s->limit_commits.ncommits = 0;
3535 
3536 	/* First process commits, which are in queue already */
3537 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3538 		int have_match = 0;
3539 
3540 		err = match_commit(&have_match, entry->id,
3541 		    entry->commit, &s->limit_regex);
3542 		if (err)
3543 			return err;
3544 
3545 		if (have_match) {
3546 			struct commit_queue_entry *matched;
3547 
3548 			matched = alloc_commit_queue_entry(entry->commit,
3549 			    entry->id);
3550 			if (matched == NULL) {
3551 				err = got_error_from_errno(
3552 				    "alloc_commit_queue_entry");
3553 				break;
3554 			}
3555 			matched->commit = entry->commit;
3556 			got_object_commit_retain(entry->commit);
3557 
3558 			matched->idx = s->limit_commits.ncommits;
3559 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3560 			    matched, entry);
3561 			s->limit_commits.ncommits++;
3562 		}
3563 	}
3564 
3565 	/* Second process all the commits, until we fill the screen */
3566 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3567 	    !s->thread_args.log_complete) {
3568 		s->thread_args.commits_needed +=
3569 		    view->nlines - s->limit_commits.ncommits - 1;
3570 		err = trigger_log_thread(view, 1);
3571 		if (err)
3572 			return err;
3573 	}
3574 
3575 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3576 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3577 	s->selected = 0;
3578 
3579 	return NULL;
3580 }
3581 
3582 static const struct got_error *
3583 search_start_log_view(struct tog_view *view)
3584 {
3585 	struct tog_log_view_state *s = &view->state.log;
3586 
3587 	s->matched_entry = NULL;
3588 	s->search_entry = NULL;
3589 	return NULL;
3590 }
3591 
3592 static const struct got_error *
3593 search_next_log_view(struct tog_view *view)
3594 {
3595 	const struct got_error *err = NULL;
3596 	struct tog_log_view_state *s = &view->state.log;
3597 	struct commit_queue_entry *entry;
3598 
3599 	/* Display progress update in log view. */
3600 	show_log_view(view);
3601 	update_panels();
3602 	doupdate();
3603 
3604 	if (s->search_entry) {
3605 		int errcode, ch;
3606 		errcode = pthread_mutex_unlock(&tog_mutex);
3607 		if (errcode)
3608 			return got_error_set_errno(errcode,
3609 			    "pthread_mutex_unlock");
3610 		ch = wgetch(view->window);
3611 		errcode = pthread_mutex_lock(&tog_mutex);
3612 		if (errcode)
3613 			return got_error_set_errno(errcode,
3614 			    "pthread_mutex_lock");
3615 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3616 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3617 			return NULL;
3618 		}
3619 		if (view->searching == TOG_SEARCH_FORWARD)
3620 			entry = TAILQ_NEXT(s->search_entry, entry);
3621 		else
3622 			entry = TAILQ_PREV(s->search_entry,
3623 			    commit_queue_head, entry);
3624 	} else if (s->matched_entry) {
3625 		/*
3626 		 * If the user has moved the cursor after we hit a match,
3627 		 * the position from where we should continue searching
3628 		 * might have changed.
3629 		 */
3630 		if (view->searching == TOG_SEARCH_FORWARD)
3631 			entry = TAILQ_NEXT(s->selected_entry, entry);
3632 		else
3633 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3634 			    entry);
3635 	} else {
3636 		entry = s->selected_entry;
3637 	}
3638 
3639 	while (1) {
3640 		int have_match = 0;
3641 
3642 		if (entry == NULL) {
3643 			if (s->thread_args.log_complete ||
3644 			    view->searching == TOG_SEARCH_BACKWARD) {
3645 				view->search_next_done =
3646 				    (s->matched_entry == NULL ?
3647 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3648 				s->search_entry = NULL;
3649 				return NULL;
3650 			}
3651 			/*
3652 			 * Poke the log thread for more commits and return,
3653 			 * allowing the main loop to make progress. Search
3654 			 * will resume at s->search_entry once we come back.
3655 			 */
3656 			s->thread_args.commits_needed++;
3657 			return trigger_log_thread(view, 0);
3658 		}
3659 
3660 		err = match_commit(&have_match, entry->id, entry->commit,
3661 		    &view->regex);
3662 		if (err)
3663 			break;
3664 		if (have_match) {
3665 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3666 			s->matched_entry = entry;
3667 			break;
3668 		}
3669 
3670 		s->search_entry = entry;
3671 		if (view->searching == TOG_SEARCH_FORWARD)
3672 			entry = TAILQ_NEXT(entry, entry);
3673 		else
3674 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3675 	}
3676 
3677 	if (s->matched_entry) {
3678 		int cur = s->selected_entry->idx;
3679 		while (cur < s->matched_entry->idx) {
3680 			err = input_log_view(NULL, view, KEY_DOWN);
3681 			if (err)
3682 				return err;
3683 			cur++;
3684 		}
3685 		while (cur > s->matched_entry->idx) {
3686 			err = input_log_view(NULL, view, KEY_UP);
3687 			if (err)
3688 				return err;
3689 			cur--;
3690 		}
3691 	}
3692 
3693 	s->search_entry = NULL;
3694 
3695 	return NULL;
3696 }
3697 
3698 static const struct got_error *
3699 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3700     struct got_repository *repo, const char *head_ref_name,
3701     const char *in_repo_path, int log_branches)
3702 {
3703 	const struct got_error *err = NULL;
3704 	struct tog_log_view_state *s = &view->state.log;
3705 	struct got_repository *thread_repo = NULL;
3706 	struct got_commit_graph *thread_graph = NULL;
3707 	int errcode;
3708 
3709 	if (in_repo_path != s->in_repo_path) {
3710 		free(s->in_repo_path);
3711 		s->in_repo_path = strdup(in_repo_path);
3712 		if (s->in_repo_path == NULL) {
3713 			err = got_error_from_errno("strdup");
3714 			goto done;
3715 		}
3716 	}
3717 
3718 	/* The commit queue only contains commits being displayed. */
3719 	TAILQ_INIT(&s->real_commits.head);
3720 	s->real_commits.ncommits = 0;
3721 	s->commits = &s->real_commits;
3722 
3723 	TAILQ_INIT(&s->limit_commits.head);
3724 	s->limit_view = 0;
3725 	s->limit_commits.ncommits = 0;
3726 
3727 	s->repo = repo;
3728 	if (head_ref_name) {
3729 		s->head_ref_name = strdup(head_ref_name);
3730 		if (s->head_ref_name == NULL) {
3731 			err = got_error_from_errno("strdup");
3732 			goto done;
3733 		}
3734 	}
3735 	s->start_id = got_object_id_dup(start_id);
3736 	if (s->start_id == NULL) {
3737 		err = got_error_from_errno("got_object_id_dup");
3738 		goto done;
3739 	}
3740 	s->log_branches = log_branches;
3741 	s->use_committer = 1;
3742 
3743 	STAILQ_INIT(&s->colors);
3744 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3745 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3746 		    get_color_value("TOG_COLOR_COMMIT"));
3747 		if (err)
3748 			goto done;
3749 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3750 		    get_color_value("TOG_COLOR_AUTHOR"));
3751 		if (err) {
3752 			free_colors(&s->colors);
3753 			goto done;
3754 		}
3755 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3756 		    get_color_value("TOG_COLOR_DATE"));
3757 		if (err) {
3758 			free_colors(&s->colors);
3759 			goto done;
3760 		}
3761 	}
3762 
3763 	view->show = show_log_view;
3764 	view->input = input_log_view;
3765 	view->resize = resize_log_view;
3766 	view->close = close_log_view;
3767 	view->search_start = search_start_log_view;
3768 	view->search_next = search_next_log_view;
3769 
3770 	if (s->thread_args.pack_fds == NULL) {
3771 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3772 		if (err)
3773 			goto done;
3774 	}
3775 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3776 	    s->thread_args.pack_fds);
3777 	if (err)
3778 		goto done;
3779 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3780 	    !s->log_branches);
3781 	if (err)
3782 		goto done;
3783 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3784 	    s->repo, NULL, NULL);
3785 	if (err)
3786 		goto done;
3787 
3788 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3789 	if (errcode) {
3790 		err = got_error_set_errno(errcode, "pthread_cond_init");
3791 		goto done;
3792 	}
3793 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3794 	if (errcode) {
3795 		err = got_error_set_errno(errcode, "pthread_cond_init");
3796 		goto done;
3797 	}
3798 
3799 	s->thread_args.commits_needed = view->nlines;
3800 	s->thread_args.graph = thread_graph;
3801 	s->thread_args.real_commits = &s->real_commits;
3802 	s->thread_args.limit_commits = &s->limit_commits;
3803 	s->thread_args.in_repo_path = s->in_repo_path;
3804 	s->thread_args.start_id = s->start_id;
3805 	s->thread_args.repo = thread_repo;
3806 	s->thread_args.log_complete = 0;
3807 	s->thread_args.quit = &s->quit;
3808 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3809 	s->thread_args.selected_entry = &s->selected_entry;
3810 	s->thread_args.searching = &view->searching;
3811 	s->thread_args.search_next_done = &view->search_next_done;
3812 	s->thread_args.regex = &view->regex;
3813 	s->thread_args.limiting = &s->limit_view;
3814 	s->thread_args.limit_regex = &s->limit_regex;
3815 	s->thread_args.limit_commits = &s->limit_commits;
3816 done:
3817 	if (err) {
3818 		if (view->close == NULL)
3819 			close_log_view(view);
3820 		view_close(view);
3821 	}
3822 	return err;
3823 }
3824 
3825 static const struct got_error *
3826 show_log_view(struct tog_view *view)
3827 {
3828 	const struct got_error *err;
3829 	struct tog_log_view_state *s = &view->state.log;
3830 
3831 	if (s->thread == NULL) {
3832 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3833 		    &s->thread_args);
3834 		if (errcode)
3835 			return got_error_set_errno(errcode, "pthread_create");
3836 		if (s->thread_args.commits_needed > 0) {
3837 			err = trigger_log_thread(view, 1);
3838 			if (err)
3839 				return err;
3840 		}
3841 	}
3842 
3843 	return draw_commits(view);
3844 }
3845 
3846 static void
3847 log_move_cursor_up(struct tog_view *view, int page, int home)
3848 {
3849 	struct tog_log_view_state *s = &view->state.log;
3850 
3851 	if (s->first_displayed_entry == NULL)
3852 		return;
3853 	if (s->selected_entry->idx == 0)
3854 		view->count = 0;
3855 
3856 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3857 	    || home)
3858 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3859 
3860 	if (!page && !home && s->selected > 0)
3861 		--s->selected;
3862 	else
3863 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3864 
3865 	select_commit(s);
3866 	return;
3867 }
3868 
3869 static const struct got_error *
3870 log_move_cursor_down(struct tog_view *view, int page)
3871 {
3872 	struct tog_log_view_state	*s = &view->state.log;
3873 	const struct got_error		*err = NULL;
3874 	int				 eos = view->nlines - 2;
3875 
3876 	if (s->first_displayed_entry == NULL)
3877 		return NULL;
3878 
3879 	if (s->thread_args.log_complete &&
3880 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3881 		return NULL;
3882 
3883 	if (view_is_hsplit_top(view))
3884 		--eos;  /* border consumes the last line */
3885 
3886 	if (!page) {
3887 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3888 			++s->selected;
3889 		else
3890 			err = log_scroll_down(view, 1);
3891 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3892 		struct commit_queue_entry *entry;
3893 		int n;
3894 
3895 		s->selected = 0;
3896 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3897 		s->last_displayed_entry = entry;
3898 		for (n = 0; n <= eos; n++) {
3899 			if (entry == NULL)
3900 				break;
3901 			s->first_displayed_entry = entry;
3902 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3903 		}
3904 		if (n > 0)
3905 			s->selected = n - 1;
3906 	} else {
3907 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3908 		    s->thread_args.log_complete)
3909 			s->selected += MIN(page,
3910 			    s->commits->ncommits - s->selected_entry->idx - 1);
3911 		else
3912 			err = log_scroll_down(view, page);
3913 	}
3914 	if (err)
3915 		return err;
3916 
3917 	/*
3918 	 * We might necessarily overshoot in horizontal
3919 	 * splits; if so, select the last displayed commit.
3920 	 */
3921 	if (s->first_displayed_entry && s->last_displayed_entry) {
3922 		s->selected = MIN(s->selected,
3923 		    s->last_displayed_entry->idx -
3924 		    s->first_displayed_entry->idx);
3925 	}
3926 
3927 	select_commit(s);
3928 
3929 	if (s->thread_args.log_complete &&
3930 	    s->selected_entry->idx == s->commits->ncommits - 1)
3931 		view->count = 0;
3932 
3933 	return NULL;
3934 }
3935 
3936 static void
3937 view_get_split(struct tog_view *view, int *y, int *x)
3938 {
3939 	*x = 0;
3940 	*y = 0;
3941 
3942 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3943 		if (view->child && view->child->resized_y)
3944 			*y = view->child->resized_y;
3945 		else if (view->resized_y)
3946 			*y = view->resized_y;
3947 		else
3948 			*y = view_split_begin_y(view->lines);
3949 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3950 		if (view->child && view->child->resized_x)
3951 			*x = view->child->resized_x;
3952 		else if (view->resized_x)
3953 			*x = view->resized_x;
3954 		else
3955 			*x = view_split_begin_x(view->begin_x);
3956 	}
3957 }
3958 
3959 /* Split view horizontally at y and offset view->state->selected line. */
3960 static const struct got_error *
3961 view_init_hsplit(struct tog_view *view, int y)
3962 {
3963 	const struct got_error *err = NULL;
3964 
3965 	view->nlines = y;
3966 	view->ncols = COLS;
3967 	err = view_resize(view);
3968 	if (err)
3969 		return err;
3970 
3971 	err = offset_selection_down(view);
3972 
3973 	return err;
3974 }
3975 
3976 static const struct got_error *
3977 log_goto_line(struct tog_view *view, int nlines)
3978 {
3979 	const struct got_error		*err = NULL;
3980 	struct tog_log_view_state	*s = &view->state.log;
3981 	int				 g, idx = s->selected_entry->idx;
3982 
3983 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3984 		return NULL;
3985 
3986 	g = view->gline;
3987 	view->gline = 0;
3988 
3989 	if (g >= s->first_displayed_entry->idx + 1 &&
3990 	    g <= s->last_displayed_entry->idx + 1 &&
3991 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3992 		s->selected = g - s->first_displayed_entry->idx - 1;
3993 		select_commit(s);
3994 		return NULL;
3995 	}
3996 
3997 	if (idx + 1 < g) {
3998 		err = log_move_cursor_down(view, g - idx - 1);
3999 		if (!err && g > s->selected_entry->idx + 1)
4000 			err = log_move_cursor_down(view,
4001 			    g - s->first_displayed_entry->idx - 1);
4002 		if (err)
4003 			return err;
4004 	} else if (idx + 1 > g)
4005 		log_move_cursor_up(view, idx - g + 1, 0);
4006 
4007 	if (g < nlines && s->first_displayed_entry->idx == 0)
4008 		s->selected = g - 1;
4009 
4010 	select_commit(s);
4011 	return NULL;
4012 
4013 }
4014 
4015 static void
4016 horizontal_scroll_input(struct tog_view *view, int ch)
4017 {
4018 
4019 	switch (ch) {
4020 	case KEY_LEFT:
4021 	case 'h':
4022 		view->x -= MIN(view->x, 2);
4023 		if (view->x <= 0)
4024 			view->count = 0;
4025 		break;
4026 	case KEY_RIGHT:
4027 	case 'l':
4028 		if (view->x + view->ncols / 2 < view->maxx)
4029 			view->x += 2;
4030 		else
4031 			view->count = 0;
4032 		break;
4033 	case '0':
4034 		view->x = 0;
4035 		break;
4036 	case '$':
4037 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4038 		view->count = 0;
4039 		break;
4040 	default:
4041 		break;
4042 	}
4043 }
4044 
4045 static const struct got_error *
4046 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4047 {
4048 	const struct got_error *err = NULL;
4049 	struct tog_log_view_state *s = &view->state.log;
4050 	int eos, nscroll;
4051 
4052 	if (s->thread_args.load_all) {
4053 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4054 			s->thread_args.load_all = 0;
4055 		else if (s->thread_args.log_complete) {
4056 			err = log_move_cursor_down(view, s->commits->ncommits);
4057 			s->thread_args.load_all = 0;
4058 		}
4059 		if (err)
4060 			return err;
4061 	}
4062 
4063 	eos = nscroll = view->nlines - 1;
4064 	if (view_is_hsplit_top(view))
4065 		--eos;  /* border */
4066 
4067 	if (view->gline)
4068 		return log_goto_line(view, eos);
4069 
4070 	switch (ch) {
4071 	case '&':
4072 		err = limit_log_view(view);
4073 		break;
4074 	case 'q':
4075 		s->quit = 1;
4076 		break;
4077 	case '0':
4078 	case '$':
4079 	case KEY_RIGHT:
4080 	case 'l':
4081 	case KEY_LEFT:
4082 	case 'h':
4083 		horizontal_scroll_input(view, ch);
4084 		break;
4085 	case 'k':
4086 	case KEY_UP:
4087 	case '<':
4088 	case ',':
4089 	case CTRL('p'):
4090 		log_move_cursor_up(view, 0, 0);
4091 		break;
4092 	case 'g':
4093 	case '=':
4094 	case KEY_HOME:
4095 		log_move_cursor_up(view, 0, 1);
4096 		view->count = 0;
4097 		break;
4098 	case CTRL('u'):
4099 	case 'u':
4100 		nscroll /= 2;
4101 		/* FALL THROUGH */
4102 	case KEY_PPAGE:
4103 	case CTRL('b'):
4104 	case 'b':
4105 		log_move_cursor_up(view, nscroll, 0);
4106 		break;
4107 	case 'j':
4108 	case KEY_DOWN:
4109 	case '>':
4110 	case '.':
4111 	case CTRL('n'):
4112 		err = log_move_cursor_down(view, 0);
4113 		break;
4114 	case '@':
4115 		s->use_committer = !s->use_committer;
4116 		view->action = s->use_committer ?
4117 		    "show committer" : "show commit author";
4118 		break;
4119 	case 'G':
4120 	case '*':
4121 	case KEY_END: {
4122 		/* We don't know yet how many commits, so we're forced to
4123 		 * traverse them all. */
4124 		view->count = 0;
4125 		s->thread_args.load_all = 1;
4126 		if (!s->thread_args.log_complete)
4127 			return trigger_log_thread(view, 0);
4128 		err = log_move_cursor_down(view, s->commits->ncommits);
4129 		s->thread_args.load_all = 0;
4130 		break;
4131 	}
4132 	case CTRL('d'):
4133 	case 'd':
4134 		nscroll /= 2;
4135 		/* FALL THROUGH */
4136 	case KEY_NPAGE:
4137 	case CTRL('f'):
4138 	case 'f':
4139 	case ' ':
4140 		err = log_move_cursor_down(view, nscroll);
4141 		break;
4142 	case KEY_RESIZE:
4143 		if (s->selected > view->nlines - 2)
4144 			s->selected = view->nlines - 2;
4145 		if (s->selected > s->commits->ncommits - 1)
4146 			s->selected = s->commits->ncommits - 1;
4147 		select_commit(s);
4148 		if (s->commits->ncommits < view->nlines - 1 &&
4149 		    !s->thread_args.log_complete) {
4150 			s->thread_args.commits_needed += (view->nlines - 1) -
4151 			    s->commits->ncommits;
4152 			err = trigger_log_thread(view, 1);
4153 		}
4154 		break;
4155 	case KEY_ENTER:
4156 	case '\r':
4157 		view->count = 0;
4158 		if (s->selected_entry == NULL)
4159 			break;
4160 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4161 		break;
4162 	case 'T':
4163 		view->count = 0;
4164 		if (s->selected_entry == NULL)
4165 			break;
4166 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4167 		break;
4168 	case KEY_BACKSPACE:
4169 	case CTRL('l'):
4170 	case 'B':
4171 		view->count = 0;
4172 		if (ch == KEY_BACKSPACE &&
4173 		    got_path_is_root_dir(s->in_repo_path))
4174 			break;
4175 		err = stop_log_thread(s);
4176 		if (err)
4177 			return err;
4178 		if (ch == KEY_BACKSPACE) {
4179 			char *parent_path;
4180 			err = got_path_dirname(&parent_path, s->in_repo_path);
4181 			if (err)
4182 				return err;
4183 			free(s->in_repo_path);
4184 			s->in_repo_path = parent_path;
4185 			s->thread_args.in_repo_path = s->in_repo_path;
4186 		} else if (ch == CTRL('l')) {
4187 			struct got_object_id *start_id;
4188 			err = got_repo_match_object_id(&start_id, NULL,
4189 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4190 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4191 			if (err) {
4192 				if (s->head_ref_name == NULL ||
4193 				    err->code != GOT_ERR_NOT_REF)
4194 					return err;
4195 				/* Try to cope with deleted references. */
4196 				free(s->head_ref_name);
4197 				s->head_ref_name = NULL;
4198 				err = got_repo_match_object_id(&start_id,
4199 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4200 				    &tog_refs, s->repo);
4201 				if (err)
4202 					return err;
4203 			}
4204 			free(s->start_id);
4205 			s->start_id = start_id;
4206 			s->thread_args.start_id = s->start_id;
4207 		} else /* 'B' */
4208 			s->log_branches = !s->log_branches;
4209 
4210 		if (s->thread_args.pack_fds == NULL) {
4211 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4212 			if (err)
4213 				return err;
4214 		}
4215 		err = got_repo_open(&s->thread_args.repo,
4216 		    got_repo_get_path(s->repo), NULL,
4217 		    s->thread_args.pack_fds);
4218 		if (err)
4219 			return err;
4220 		tog_free_refs();
4221 		err = tog_load_refs(s->repo, 0);
4222 		if (err)
4223 			return err;
4224 		err = got_commit_graph_open(&s->thread_args.graph,
4225 		    s->in_repo_path, !s->log_branches);
4226 		if (err)
4227 			return err;
4228 		err = got_commit_graph_iter_start(s->thread_args.graph,
4229 		    s->start_id, s->repo, NULL, NULL);
4230 		if (err)
4231 			return err;
4232 		free_commits(&s->real_commits);
4233 		free_commits(&s->limit_commits);
4234 		s->first_displayed_entry = NULL;
4235 		s->last_displayed_entry = NULL;
4236 		s->selected_entry = NULL;
4237 		s->selected = 0;
4238 		s->thread_args.log_complete = 0;
4239 		s->quit = 0;
4240 		s->thread_args.commits_needed = view->lines;
4241 		s->matched_entry = NULL;
4242 		s->search_entry = NULL;
4243 		view->offset = 0;
4244 		break;
4245 	case 'R':
4246 		view->count = 0;
4247 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4248 		break;
4249 	default:
4250 		view->count = 0;
4251 		break;
4252 	}
4253 
4254 	return err;
4255 }
4256 
4257 static const struct got_error *
4258 apply_unveil(const char *repo_path, const char *worktree_path)
4259 {
4260 	const struct got_error *error;
4261 
4262 #ifdef PROFILE
4263 	if (unveil("gmon.out", "rwc") != 0)
4264 		return got_error_from_errno2("unveil", "gmon.out");
4265 #endif
4266 	if (repo_path && unveil(repo_path, "r") != 0)
4267 		return got_error_from_errno2("unveil", repo_path);
4268 
4269 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4270 		return got_error_from_errno2("unveil", worktree_path);
4271 
4272 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4273 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4274 
4275 	error = got_privsep_unveil_exec_helpers();
4276 	if (error != NULL)
4277 		return error;
4278 
4279 	if (unveil(NULL, NULL) != 0)
4280 		return got_error_from_errno("unveil");
4281 
4282 	return NULL;
4283 }
4284 
4285 static const struct got_error *
4286 init_mock_term(const char *test_script_path)
4287 {
4288 	const struct got_error	*err = NULL;
4289 	const char *screen_dump_path;
4290 	int in;
4291 
4292 	if (test_script_path == NULL || *test_script_path == '\0')
4293 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4294 
4295 	tog_io.f = fopen(test_script_path, "re");
4296 	if (tog_io.f == NULL) {
4297 		err = got_error_from_errno_fmt("fopen: %s",
4298 		    test_script_path);
4299 		goto done;
4300 	}
4301 
4302 	/* test mode, we don't want any output */
4303 	tog_io.cout = fopen("/dev/null", "w+");
4304 	if (tog_io.cout == NULL) {
4305 		err = got_error_from_errno2("fopen", "/dev/null");
4306 		goto done;
4307 	}
4308 
4309 	in = dup(fileno(tog_io.cout));
4310 	if (in == -1) {
4311 		err = got_error_from_errno("dup");
4312 		goto done;
4313 	}
4314 	tog_io.cin = fdopen(in, "r");
4315 	if (tog_io.cin == NULL) {
4316 		err = got_error_from_errno("fdopen");
4317 		close(in);
4318 		goto done;
4319 	}
4320 
4321 	screen_dump_path = getenv("TOG_SCR_DUMP");
4322 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4323 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4324 	tog_io.sdump = fopen(screen_dump_path, "we");
4325 	if (tog_io.sdump == NULL) {
4326 		err = got_error_from_errno2("fopen", screen_dump_path);
4327 		goto done;
4328 	}
4329 
4330 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4331 		err = got_error_from_errno("fseeko");
4332 		goto done;
4333 	}
4334 
4335 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4336 		err = got_error_msg(GOT_ERR_IO,
4337 		    "newterm: failed to initialise curses");
4338 
4339 	using_mock_io = 1;
4340 
4341 done:
4342 	if (err)
4343 		tog_io_close();
4344 	return err;
4345 }
4346 
4347 static void
4348 init_curses(void)
4349 {
4350 	/*
4351 	 * Override default signal handlers before starting ncurses.
4352 	 * This should prevent ncurses from installing its own
4353 	 * broken cleanup() signal handler.
4354 	 */
4355 	signal(SIGWINCH, tog_sigwinch);
4356 	signal(SIGPIPE, tog_sigpipe);
4357 	signal(SIGCONT, tog_sigcont);
4358 	signal(SIGINT, tog_sigint);
4359 	signal(SIGTERM, tog_sigterm);
4360 
4361 	if (using_mock_io) /* In test mode we use a fake terminal */
4362 		return;
4363 
4364 	initscr();
4365 
4366 	cbreak();
4367 	halfdelay(1); /* Fast refresh while initial view is loading. */
4368 	noecho();
4369 	nonl();
4370 	intrflush(stdscr, FALSE);
4371 	keypad(stdscr, TRUE);
4372 	curs_set(0);
4373 	if (getenv("TOG_COLORS") != NULL) {
4374 		start_color();
4375 		use_default_colors();
4376 	}
4377 
4378 	return;
4379 }
4380 
4381 static const struct got_error *
4382 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4383 {
4384 	tog_base_commit.id = got_object_id_dup(
4385 	    got_worktree_get_base_commit_id(worktree));
4386 	if (tog_base_commit.id == NULL)
4387 		return got_error_from_errno( "got_object_id_dup");
4388 
4389 	tog_base_commit.idx = -1;
4390 
4391 	return got_worktree_get_state(&tog_base_commit.marker, repo,
4392 	    worktree);
4393 }
4394 
4395 static const struct got_error *
4396 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4397     struct got_repository *repo, struct got_worktree *worktree)
4398 {
4399 	const struct got_error *err = NULL;
4400 
4401 	if (argc == 0) {
4402 		*in_repo_path = strdup("/");
4403 		if (*in_repo_path == NULL)
4404 			return got_error_from_errno("strdup");
4405 		return NULL;
4406 	}
4407 
4408 	if (worktree) {
4409 		const char *prefix = got_worktree_get_path_prefix(worktree);
4410 		char *p;
4411 
4412 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4413 		if (err)
4414 			return err;
4415 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4416 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4417 		    p) == -1) {
4418 			err = got_error_from_errno("asprintf");
4419 			*in_repo_path = NULL;
4420 		}
4421 		free(p);
4422 	} else
4423 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4424 
4425 	return err;
4426 }
4427 
4428 static const struct got_error *
4429 cmd_log(int argc, char *argv[])
4430 {
4431 	const struct got_error *error;
4432 	struct got_repository *repo = NULL;
4433 	struct got_worktree *worktree = NULL;
4434 	struct got_object_id *start_id = NULL;
4435 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4436 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4437 	struct got_reference *ref = NULL;
4438 	const char *head_ref_name = NULL;
4439 	int ch, log_branches = 0;
4440 	struct tog_view *view;
4441 	int *pack_fds = NULL;
4442 
4443 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4444 		switch (ch) {
4445 		case 'b':
4446 			log_branches = 1;
4447 			break;
4448 		case 'c':
4449 			start_commit = optarg;
4450 			break;
4451 		case 'r':
4452 			repo_path = realpath(optarg, NULL);
4453 			if (repo_path == NULL)
4454 				return got_error_from_errno2("realpath",
4455 				    optarg);
4456 			break;
4457 		default:
4458 			usage_log();
4459 			/* NOTREACHED */
4460 		}
4461 	}
4462 
4463 	argc -= optind;
4464 	argv += optind;
4465 
4466 	if (argc > 1)
4467 		usage_log();
4468 
4469 	error = got_repo_pack_fds_open(&pack_fds);
4470 	if (error != NULL)
4471 		goto done;
4472 
4473 	if (repo_path == NULL) {
4474 		cwd = getcwd(NULL, 0);
4475 		if (cwd == NULL)
4476 			return got_error_from_errno("getcwd");
4477 		error = got_worktree_open(&worktree, cwd, NULL);
4478 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4479 			goto done;
4480 		if (worktree)
4481 			repo_path =
4482 			    strdup(got_worktree_get_repo_path(worktree));
4483 		else
4484 			repo_path = strdup(cwd);
4485 		if (repo_path == NULL) {
4486 			error = got_error_from_errno("strdup");
4487 			goto done;
4488 		}
4489 	}
4490 
4491 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4492 	if (error != NULL)
4493 		goto done;
4494 
4495 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4496 	    repo, worktree);
4497 	if (error)
4498 		goto done;
4499 
4500 	init_curses();
4501 
4502 	error = apply_unveil(got_repo_get_path(repo),
4503 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4504 	if (error)
4505 		goto done;
4506 
4507 	/* already loaded by tog_log_with_path()? */
4508 	if (TAILQ_EMPTY(&tog_refs)) {
4509 		error = tog_load_refs(repo, 0);
4510 		if (error)
4511 			goto done;
4512 	}
4513 
4514 	if (start_commit == NULL) {
4515 		error = got_repo_match_object_id(&start_id, &label,
4516 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4517 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4518 		if (error)
4519 			goto done;
4520 		head_ref_name = label;
4521 	} else {
4522 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4523 		    repo, worktree);
4524 		if (error != NULL)
4525 			goto done;
4526 		if (keyword_idstr != NULL)
4527 			start_commit = keyword_idstr;
4528 
4529 		error = got_ref_open(&ref, repo, start_commit, 0);
4530 		if (error == NULL)
4531 			head_ref_name = got_ref_get_name(ref);
4532 		else if (error->code != GOT_ERR_NOT_REF)
4533 			goto done;
4534 		error = got_repo_match_object_id(&start_id, NULL,
4535 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4536 		if (error)
4537 			goto done;
4538 	}
4539 
4540 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4541 	if (view == NULL) {
4542 		error = got_error_from_errno("view_open");
4543 		goto done;
4544 	}
4545 	error = open_log_view(view, start_id, repo, head_ref_name,
4546 	    in_repo_path, log_branches);
4547 	if (error)
4548 		goto done;
4549 
4550 	if (worktree) {
4551 		error = set_tog_base_commit(repo, worktree);
4552 		if (error != NULL)
4553 			goto done;
4554 
4555 		/* Release work tree lock. */
4556 		got_worktree_close(worktree);
4557 		worktree = NULL;
4558 	}
4559 
4560 	error = view_loop(view);
4561 
4562 done:
4563 	free(tog_base_commit.id);
4564 	free(keyword_idstr);
4565 	free(in_repo_path);
4566 	free(repo_path);
4567 	free(cwd);
4568 	free(start_id);
4569 	free(label);
4570 	if (ref)
4571 		got_ref_close(ref);
4572 	if (repo) {
4573 		const struct got_error *close_err = got_repo_close(repo);
4574 		if (error == NULL)
4575 			error = close_err;
4576 	}
4577 	if (worktree)
4578 		got_worktree_close(worktree);
4579 	if (pack_fds) {
4580 		const struct got_error *pack_err =
4581 		    got_repo_pack_fds_close(pack_fds);
4582 		if (error == NULL)
4583 			error = pack_err;
4584 	}
4585 	tog_free_refs();
4586 	return error;
4587 }
4588 
4589 __dead static void
4590 usage_diff(void)
4591 {
4592 	endwin();
4593 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4594 	    "object1 object2\n", getprogname());
4595 	exit(1);
4596 }
4597 
4598 static int
4599 match_line(const char *line, regex_t *regex, size_t nmatch,
4600     regmatch_t *regmatch)
4601 {
4602 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4603 }
4604 
4605 static struct tog_color *
4606 match_color(struct tog_colors *colors, const char *line)
4607 {
4608 	struct tog_color *tc = NULL;
4609 
4610 	STAILQ_FOREACH(tc, colors, entry) {
4611 		if (match_line(line, &tc->regex, 0, NULL))
4612 			return tc;
4613 	}
4614 
4615 	return NULL;
4616 }
4617 
4618 static const struct got_error *
4619 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4620     WINDOW *window, int skipcol, regmatch_t *regmatch)
4621 {
4622 	const struct got_error *err = NULL;
4623 	char *exstr = NULL;
4624 	wchar_t *wline = NULL;
4625 	int rme, rms, n, width, scrollx;
4626 	int width0 = 0, width1 = 0, width2 = 0;
4627 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4628 
4629 	*wtotal = 0;
4630 
4631 	rms = regmatch->rm_so;
4632 	rme = regmatch->rm_eo;
4633 
4634 	err = expand_tab(&exstr, line);
4635 	if (err)
4636 		return err;
4637 
4638 	/* Split the line into 3 segments, according to match offsets. */
4639 	seg0 = strndup(exstr, rms);
4640 	if (seg0 == NULL) {
4641 		err = got_error_from_errno("strndup");
4642 		goto done;
4643 	}
4644 	seg1 = strndup(exstr + rms, rme - rms);
4645 	if (seg1 == NULL) {
4646 		err = got_error_from_errno("strndup");
4647 		goto done;
4648 	}
4649 	seg2 = strdup(exstr + rme);
4650 	if (seg2 == NULL) {
4651 		err = got_error_from_errno("strndup");
4652 		goto done;
4653 	}
4654 
4655 	/* draw up to matched token if we haven't scrolled past it */
4656 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4657 	    col_tab_align, 1);
4658 	if (err)
4659 		goto done;
4660 	n = MAX(width0 - skipcol, 0);
4661 	if (n) {
4662 		free(wline);
4663 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4664 		    wlimit, col_tab_align, 1);
4665 		if (err)
4666 			goto done;
4667 		waddwstr(window, &wline[scrollx]);
4668 		wlimit -= width;
4669 		*wtotal += width;
4670 	}
4671 
4672 	if (wlimit > 0) {
4673 		int i = 0, w = 0;
4674 		size_t wlen;
4675 
4676 		free(wline);
4677 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4678 		    col_tab_align, 1);
4679 		if (err)
4680 			goto done;
4681 		wlen = wcslen(wline);
4682 		while (i < wlen) {
4683 			width = wcwidth(wline[i]);
4684 			if (width == -1) {
4685 				/* should not happen, tabs are expanded */
4686 				err = got_error(GOT_ERR_RANGE);
4687 				goto done;
4688 			}
4689 			if (width0 + w + width > skipcol)
4690 				break;
4691 			w += width;
4692 			i++;
4693 		}
4694 		/* draw (visible part of) matched token (if scrolled into it) */
4695 		if (width1 - w > 0) {
4696 			wattron(window, A_STANDOUT);
4697 			waddwstr(window, &wline[i]);
4698 			wattroff(window, A_STANDOUT);
4699 			wlimit -= (width1 - w);
4700 			*wtotal += (width1 - w);
4701 		}
4702 	}
4703 
4704 	if (wlimit > 0) {  /* draw rest of line */
4705 		free(wline);
4706 		if (skipcol > width0 + width1) {
4707 			err = format_line(&wline, &width2, &scrollx, seg2,
4708 			    skipcol - (width0 + width1), wlimit,
4709 			    col_tab_align, 1);
4710 			if (err)
4711 				goto done;
4712 			waddwstr(window, &wline[scrollx]);
4713 		} else {
4714 			err = format_line(&wline, &width2, NULL, seg2, 0,
4715 			    wlimit, col_tab_align, 1);
4716 			if (err)
4717 				goto done;
4718 			waddwstr(window, wline);
4719 		}
4720 		*wtotal += width2;
4721 	}
4722 done:
4723 	free(wline);
4724 	free(exstr);
4725 	free(seg0);
4726 	free(seg1);
4727 	free(seg2);
4728 	return err;
4729 }
4730 
4731 static int
4732 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4733 {
4734 	FILE	*f = NULL;
4735 	int	*eof, *first, *selected;
4736 
4737 	if (view->type == TOG_VIEW_DIFF) {
4738 		struct tog_diff_view_state *s = &view->state.diff;
4739 
4740 		first = &s->first_displayed_line;
4741 		selected = first;
4742 		eof = &s->eof;
4743 		f = s->f;
4744 	} else if (view->type == TOG_VIEW_HELP) {
4745 		struct tog_help_view_state *s = &view->state.help;
4746 
4747 		first = &s->first_displayed_line;
4748 		selected = first;
4749 		eof = &s->eof;
4750 		f = s->f;
4751 	} else if (view->type == TOG_VIEW_BLAME) {
4752 		struct tog_blame_view_state *s = &view->state.blame;
4753 
4754 		first = &s->first_displayed_line;
4755 		selected = &s->selected_line;
4756 		eof = &s->eof;
4757 		f = s->blame.f;
4758 	} else
4759 		return 0;
4760 
4761 	/* Center gline in the middle of the page like vi(1). */
4762 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4763 		return 0;
4764 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4765 		rewind(f);
4766 		*eof = 0;
4767 		*first = 1;
4768 		*lineno = 0;
4769 		*nprinted = 0;
4770 		return 0;
4771 	}
4772 
4773 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4774 		view->gline : (view->nlines - 3) / 2 + 1;
4775 	view->gline = 0;
4776 
4777 	return 1;
4778 }
4779 
4780 static const struct got_error *
4781 draw_file(struct tog_view *view, const char *header)
4782 {
4783 	struct tog_diff_view_state *s = &view->state.diff;
4784 	regmatch_t *regmatch = &view->regmatch;
4785 	const struct got_error *err;
4786 	int nprinted = 0;
4787 	char *line;
4788 	size_t linesize = 0;
4789 	ssize_t linelen;
4790 	wchar_t *wline;
4791 	int width;
4792 	int max_lines = view->nlines;
4793 	int nlines = s->nlines;
4794 	off_t line_offset;
4795 
4796 	s->lineno = s->first_displayed_line - 1;
4797 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4798 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4799 		return got_error_from_errno("fseek");
4800 
4801 	werase(view->window);
4802 
4803 	if (view->gline > s->nlines - 1)
4804 		view->gline = s->nlines - 1;
4805 
4806 	if (header) {
4807 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4808 		    1 : view->gline - (view->nlines - 3) / 2 :
4809 		    s->lineno + s->selected_line;
4810 
4811 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4812 			return got_error_from_errno("asprintf");
4813 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4814 		    0, 0);
4815 		free(line);
4816 		if (err)
4817 			return err;
4818 
4819 		if (view_needs_focus_indication(view))
4820 			wstandout(view->window);
4821 		waddwstr(view->window, wline);
4822 		free(wline);
4823 		wline = NULL;
4824 		while (width++ < view->ncols)
4825 			waddch(view->window, ' ');
4826 		if (view_needs_focus_indication(view))
4827 			wstandend(view->window);
4828 
4829 		if (max_lines <= 1)
4830 			return NULL;
4831 		max_lines--;
4832 	}
4833 
4834 	s->eof = 0;
4835 	view->maxx = 0;
4836 	line = NULL;
4837 	while (max_lines > 0 && nprinted < max_lines) {
4838 		enum got_diff_line_type linetype;
4839 		attr_t attr = 0;
4840 
4841 		linelen = getline(&line, &linesize, s->f);
4842 		if (linelen == -1) {
4843 			if (feof(s->f)) {
4844 				s->eof = 1;
4845 				break;
4846 			}
4847 			free(line);
4848 			return got_ferror(s->f, GOT_ERR_IO);
4849 		}
4850 
4851 		if (++s->lineno < s->first_displayed_line)
4852 			continue;
4853 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4854 			continue;
4855 		if (s->lineno == view->hiline)
4856 			attr = A_STANDOUT;
4857 
4858 		/* Set view->maxx based on full line length. */
4859 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4860 		    view->x ? 1 : 0);
4861 		if (err) {
4862 			free(line);
4863 			return err;
4864 		}
4865 		view->maxx = MAX(view->maxx, width);
4866 		free(wline);
4867 		wline = NULL;
4868 
4869 		linetype = s->lines[s->lineno].type;
4870 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4871 		    linetype < GOT_DIFF_LINE_CONTEXT)
4872 			attr |= COLOR_PAIR(linetype);
4873 		if (attr)
4874 			wattron(view->window, attr);
4875 		if (s->first_displayed_line + nprinted == s->matched_line &&
4876 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4877 			err = add_matched_line(&width, line, view->ncols, 0,
4878 			    view->window, view->x, regmatch);
4879 			if (err) {
4880 				free(line);
4881 				return err;
4882 			}
4883 		} else {
4884 			int skip;
4885 			err = format_line(&wline, &width, &skip, line,
4886 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4887 			if (err) {
4888 				free(line);
4889 				return err;
4890 			}
4891 			waddwstr(view->window, &wline[skip]);
4892 			free(wline);
4893 			wline = NULL;
4894 		}
4895 		if (s->lineno == view->hiline) {
4896 			/* highlight full gline length */
4897 			while (width++ < view->ncols)
4898 				waddch(view->window, ' ');
4899 		} else {
4900 			if (width <= view->ncols - 1)
4901 				waddch(view->window, '\n');
4902 		}
4903 		if (attr)
4904 			wattroff(view->window, attr);
4905 		if (++nprinted == 1)
4906 			s->first_displayed_line = s->lineno;
4907 	}
4908 	free(line);
4909 	if (nprinted >= 1)
4910 		s->last_displayed_line = s->first_displayed_line +
4911 		    (nprinted - 1);
4912 	else
4913 		s->last_displayed_line = s->first_displayed_line;
4914 
4915 	view_border(view);
4916 
4917 	if (s->eof) {
4918 		while (nprinted < view->nlines) {
4919 			waddch(view->window, '\n');
4920 			nprinted++;
4921 		}
4922 
4923 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4924 		    view->ncols, 0, 0);
4925 		if (err) {
4926 			return err;
4927 		}
4928 
4929 		wstandout(view->window);
4930 		waddwstr(view->window, wline);
4931 		free(wline);
4932 		wline = NULL;
4933 		wstandend(view->window);
4934 	}
4935 
4936 	return NULL;
4937 }
4938 
4939 static char *
4940 get_datestr(time_t *time, char *datebuf)
4941 {
4942 	struct tm mytm, *tm;
4943 	char *p, *s;
4944 
4945 	tm = gmtime_r(time, &mytm);
4946 	if (tm == NULL)
4947 		return NULL;
4948 	s = asctime_r(tm, datebuf);
4949 	if (s == NULL)
4950 		return NULL;
4951 	p = strchr(s, '\n');
4952 	if (p)
4953 		*p = '\0';
4954 	return s;
4955 }
4956 
4957 static const struct got_error *
4958 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4959     off_t off, uint8_t type)
4960 {
4961 	struct got_diff_line *p;
4962 
4963 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4964 	if (p == NULL)
4965 		return got_error_from_errno("reallocarray");
4966 	*lines = p;
4967 	(*lines)[*nlines].offset = off;
4968 	(*lines)[*nlines].type = type;
4969 	(*nlines)++;
4970 
4971 	return NULL;
4972 }
4973 
4974 static const struct got_error *
4975 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4976     struct got_diff_line *s_lines, size_t s_nlines)
4977 {
4978 	struct got_diff_line	*p;
4979 	char			 buf[BUFSIZ];
4980 	size_t			 i, r;
4981 
4982 	if (fseeko(src, 0L, SEEK_SET) == -1)
4983 		return got_error_from_errno("fseeko");
4984 
4985 	for (;;) {
4986 		r = fread(buf, 1, sizeof(buf), src);
4987 		if (r == 0) {
4988 			if (ferror(src))
4989 				return got_error_from_errno("fread");
4990 			if (feof(src))
4991 				break;
4992 		}
4993 		if (fwrite(buf, 1, r, dst) != r)
4994 			return got_ferror(dst, GOT_ERR_IO);
4995 	}
4996 
4997 	if (s_nlines == 0 && *d_nlines == 0)
4998 		return NULL;
4999 
5000 	/*
5001 	 * If commit info was in dst, increment line offsets
5002 	 * of the appended diff content, but skip s_lines[0]
5003 	 * because offset zero is already in *d_lines.
5004 	 */
5005 	if (*d_nlines > 0) {
5006 		for (i = 1; i < s_nlines; ++i)
5007 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5008 
5009 		if (s_nlines > 0) {
5010 			--s_nlines;
5011 			++s_lines;
5012 		}
5013 	}
5014 
5015 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5016 	if (p == NULL) {
5017 		/* d_lines is freed in close_diff_view() */
5018 		return got_error_from_errno("reallocarray");
5019 	}
5020 
5021 	*d_lines = p;
5022 
5023 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5024 	*d_nlines += s_nlines;
5025 
5026 	return NULL;
5027 }
5028 
5029 static const struct got_error *
5030 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5031     struct got_object_id *commit_id, struct got_reflist_head *refs,
5032     struct got_repository *repo, int ignore_ws, int force_text_diff,
5033     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5034 {
5035 	const struct got_error *err = NULL;
5036 	char datebuf[26], *datestr;
5037 	struct got_commit_object *commit;
5038 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5039 	time_t committer_time;
5040 	const char *author, *committer;
5041 	char *refs_str = NULL;
5042 	struct got_pathlist_entry *pe;
5043 	off_t outoff = 0;
5044 	int n;
5045 
5046 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5047 	if (err)
5048 		return err;
5049 
5050 	err = got_object_open_as_commit(&commit, repo, commit_id);
5051 	if (err)
5052 		return err;
5053 
5054 	err = got_object_id_str(&id_str, commit_id);
5055 	if (err) {
5056 		err = got_error_from_errno("got_object_id_str");
5057 		goto done;
5058 	}
5059 
5060 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5061 	if (err)
5062 		goto done;
5063 
5064 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5065 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5066 	if (n < 0) {
5067 		err = got_error_from_errno("fprintf");
5068 		goto done;
5069 	}
5070 	outoff += n;
5071 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5072 	if (err)
5073 		goto done;
5074 
5075 	n = fprintf(outfile, "from: %s\n",
5076 	    got_object_commit_get_author(commit));
5077 	if (n < 0) {
5078 		err = got_error_from_errno("fprintf");
5079 		goto done;
5080 	}
5081 	outoff += n;
5082 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5083 	if (err)
5084 		goto done;
5085 
5086 	author = got_object_commit_get_author(commit);
5087 	committer = got_object_commit_get_committer(commit);
5088 	if (strcmp(author, committer) != 0) {
5089 		n = fprintf(outfile, "via: %s\n", committer);
5090 		if (n < 0) {
5091 			err = got_error_from_errno("fprintf");
5092 			goto done;
5093 		}
5094 		outoff += n;
5095 		err = add_line_metadata(lines, nlines, outoff,
5096 		    GOT_DIFF_LINE_AUTHOR);
5097 		if (err)
5098 			goto done;
5099 	}
5100 	committer_time = got_object_commit_get_committer_time(commit);
5101 	datestr = get_datestr(&committer_time, datebuf);
5102 	if (datestr) {
5103 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5104 		if (n < 0) {
5105 			err = got_error_from_errno("fprintf");
5106 			goto done;
5107 		}
5108 		outoff += n;
5109 		err = add_line_metadata(lines, nlines, outoff,
5110 		    GOT_DIFF_LINE_DATE);
5111 		if (err)
5112 			goto done;
5113 	}
5114 	if (got_object_commit_get_nparents(commit) > 1) {
5115 		const struct got_object_id_queue *parent_ids;
5116 		struct got_object_qid *qid;
5117 		int pn = 1;
5118 		parent_ids = got_object_commit_get_parent_ids(commit);
5119 		STAILQ_FOREACH(qid, parent_ids, entry) {
5120 			err = got_object_id_str(&id_str, &qid->id);
5121 			if (err)
5122 				goto done;
5123 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5124 			if (n < 0) {
5125 				err = got_error_from_errno("fprintf");
5126 				goto done;
5127 			}
5128 			outoff += n;
5129 			err = add_line_metadata(lines, nlines, outoff,
5130 			    GOT_DIFF_LINE_META);
5131 			if (err)
5132 				goto done;
5133 			free(id_str);
5134 			id_str = NULL;
5135 		}
5136 	}
5137 
5138 	err = got_object_commit_get_logmsg(&logmsg, commit);
5139 	if (err)
5140 		goto done;
5141 	s = logmsg;
5142 	while ((line = strsep(&s, "\n")) != NULL) {
5143 		n = fprintf(outfile, "%s\n", line);
5144 		if (n < 0) {
5145 			err = got_error_from_errno("fprintf");
5146 			goto done;
5147 		}
5148 		outoff += n;
5149 		err = add_line_metadata(lines, nlines, outoff,
5150 		    GOT_DIFF_LINE_LOGMSG);
5151 		if (err)
5152 			goto done;
5153 	}
5154 
5155 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5156 		struct got_diff_changed_path *cp = pe->data;
5157 		int pad = dsa->max_path_len - pe->path_len + 1;
5158 
5159 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5160 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5161 		    dsa->rm_cols + 1, cp->rm);
5162 		if (n < 0) {
5163 			err = got_error_from_errno("fprintf");
5164 			goto done;
5165 		}
5166 		outoff += n;
5167 		err = add_line_metadata(lines, nlines, outoff,
5168 		    GOT_DIFF_LINE_CHANGES);
5169 		if (err)
5170 			goto done;
5171 	}
5172 
5173 	fputc('\n', outfile);
5174 	outoff++;
5175 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5176 	if (err)
5177 		goto done;
5178 
5179 	n = fprintf(outfile,
5180 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5181 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5182 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5183 	if (n < 0) {
5184 		err = got_error_from_errno("fprintf");
5185 		goto done;
5186 	}
5187 	outoff += n;
5188 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5189 	if (err)
5190 		goto done;
5191 
5192 	fputc('\n', outfile);
5193 	outoff++;
5194 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5195 done:
5196 	free(id_str);
5197 	free(logmsg);
5198 	free(refs_str);
5199 	got_object_commit_close(commit);
5200 	if (err) {
5201 		free(*lines);
5202 		*lines = NULL;
5203 		*nlines = 0;
5204 	}
5205 	return err;
5206 }
5207 
5208 static const struct got_error *
5209 create_diff(struct tog_diff_view_state *s)
5210 {
5211 	const struct got_error *err = NULL;
5212 	FILE *f = NULL, *tmp_diff_file = NULL;
5213 	int obj_type;
5214 	struct got_diff_line *lines = NULL;
5215 	struct got_pathlist_head changed_paths;
5216 
5217 	TAILQ_INIT(&changed_paths);
5218 
5219 	free(s->lines);
5220 	s->lines = malloc(sizeof(*s->lines));
5221 	if (s->lines == NULL)
5222 		return got_error_from_errno("malloc");
5223 	s->nlines = 0;
5224 
5225 	f = got_opentemp();
5226 	if (f == NULL) {
5227 		err = got_error_from_errno("got_opentemp");
5228 		goto done;
5229 	}
5230 	tmp_diff_file = got_opentemp();
5231 	if (tmp_diff_file == NULL) {
5232 		err = got_error_from_errno("got_opentemp");
5233 		goto done;
5234 	}
5235 	if (s->f && fclose(s->f) == EOF) {
5236 		err = got_error_from_errno("fclose");
5237 		goto done;
5238 	}
5239 	s->f = f;
5240 
5241 	if (s->id1)
5242 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5243 	else
5244 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5245 	if (err)
5246 		goto done;
5247 
5248 	switch (obj_type) {
5249 	case GOT_OBJ_TYPE_BLOB:
5250 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5251 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5252 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5253 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5254 		    s->f);
5255 		break;
5256 	case GOT_OBJ_TYPE_TREE:
5257 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5258 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5259 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5260 		    s->force_text_diff, NULL, s->repo, s->f);
5261 		break;
5262 	case GOT_OBJ_TYPE_COMMIT: {
5263 		const struct got_object_id_queue *parent_ids;
5264 		struct got_object_qid *pid;
5265 		struct got_commit_object *commit2;
5266 		struct got_reflist_head *refs;
5267 		size_t nlines = 0;
5268 		struct got_diffstat_cb_arg dsa = {
5269 			0, 0, 0, 0, 0, 0,
5270 			&changed_paths,
5271 			s->ignore_whitespace,
5272 			s->force_text_diff,
5273 			tog_diff_algo
5274 		};
5275 
5276 		lines = malloc(sizeof(*lines));
5277 		if (lines == NULL) {
5278 			err = got_error_from_errno("malloc");
5279 			goto done;
5280 		}
5281 
5282 		/* build diff first in tmp file then append to commit info */
5283 		err = got_diff_objects_as_commits(&lines, &nlines,
5284 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5285 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5286 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5287 		if (err)
5288 			break;
5289 
5290 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5291 		if (err)
5292 			goto done;
5293 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5294 		/* Show commit info if we're diffing to a parent/root commit. */
5295 		if (s->id1 == NULL) {
5296 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5297 			    refs, s->repo, s->ignore_whitespace,
5298 			    s->force_text_diff, &dsa, s->f);
5299 			if (err)
5300 				goto done;
5301 		} else {
5302 			parent_ids = got_object_commit_get_parent_ids(commit2);
5303 			STAILQ_FOREACH(pid, parent_ids, entry) {
5304 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5305 					err = write_commit_info(&s->lines,
5306 					    &s->nlines, s->id2, refs, s->repo,
5307 					    s->ignore_whitespace,
5308 					    s->force_text_diff, &dsa, s->f);
5309 					if (err)
5310 						goto done;
5311 					break;
5312 				}
5313 			}
5314 		}
5315 		got_object_commit_close(commit2);
5316 
5317 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5318 		    lines, nlines);
5319 		break;
5320 	}
5321 	default:
5322 		err = got_error(GOT_ERR_OBJ_TYPE);
5323 		break;
5324 	}
5325 done:
5326 	free(lines);
5327 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5328 	if (s->f && fflush(s->f) != 0 && err == NULL)
5329 		err = got_error_from_errno("fflush");
5330 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5331 		err = got_error_from_errno("fclose");
5332 	return err;
5333 }
5334 
5335 static void
5336 diff_view_indicate_progress(struct tog_view *view)
5337 {
5338 	mvwaddstr(view->window, 0, 0, "diffing...");
5339 	update_panels();
5340 	doupdate();
5341 }
5342 
5343 static const struct got_error *
5344 search_start_diff_view(struct tog_view *view)
5345 {
5346 	struct tog_diff_view_state *s = &view->state.diff;
5347 
5348 	s->matched_line = 0;
5349 	return NULL;
5350 }
5351 
5352 static void
5353 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5354     size_t *nlines, int **first, int **last, int **match, int **selected)
5355 {
5356 	struct tog_diff_view_state *s = &view->state.diff;
5357 
5358 	*f = s->f;
5359 	*nlines = s->nlines;
5360 	*line_offsets = NULL;
5361 	*match = &s->matched_line;
5362 	*first = &s->first_displayed_line;
5363 	*last = &s->last_displayed_line;
5364 	*selected = &s->selected_line;
5365 }
5366 
5367 static const struct got_error *
5368 search_next_view_match(struct tog_view *view)
5369 {
5370 	const struct got_error *err = NULL;
5371 	FILE *f;
5372 	int lineno;
5373 	char *line = NULL;
5374 	size_t linesize = 0;
5375 	ssize_t linelen;
5376 	off_t *line_offsets;
5377 	size_t nlines = 0;
5378 	int *first, *last, *match, *selected;
5379 
5380 	if (!view->search_setup)
5381 		return got_error_msg(GOT_ERR_NOT_IMPL,
5382 		    "view search not supported");
5383 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5384 	    &match, &selected);
5385 
5386 	if (!view->searching) {
5387 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5388 		return NULL;
5389 	}
5390 
5391 	if (*match) {
5392 		if (view->searching == TOG_SEARCH_FORWARD)
5393 			lineno = *first + 1;
5394 		else
5395 			lineno = *first - 1;
5396 	} else
5397 		lineno = *first - 1 + *selected;
5398 
5399 	while (1) {
5400 		off_t offset;
5401 
5402 		if (lineno <= 0 || lineno > nlines) {
5403 			if (*match == 0) {
5404 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5405 				break;
5406 			}
5407 
5408 			if (view->searching == TOG_SEARCH_FORWARD)
5409 				lineno = 1;
5410 			else
5411 				lineno = nlines;
5412 		}
5413 
5414 		offset = view->type == TOG_VIEW_DIFF ?
5415 		    view->state.diff.lines[lineno - 1].offset :
5416 		    line_offsets[lineno - 1];
5417 		if (fseeko(f, offset, SEEK_SET) != 0) {
5418 			free(line);
5419 			return got_error_from_errno("fseeko");
5420 		}
5421 		linelen = getline(&line, &linesize, f);
5422 		if (linelen != -1) {
5423 			char *exstr;
5424 			err = expand_tab(&exstr, line);
5425 			if (err)
5426 				break;
5427 			if (match_line(exstr, &view->regex, 1,
5428 			    &view->regmatch)) {
5429 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5430 				*match = lineno;
5431 				free(exstr);
5432 				break;
5433 			}
5434 			free(exstr);
5435 		}
5436 		if (view->searching == TOG_SEARCH_FORWARD)
5437 			lineno++;
5438 		else
5439 			lineno--;
5440 	}
5441 	free(line);
5442 
5443 	if (*match) {
5444 		*first = *match;
5445 		*selected = 1;
5446 	}
5447 
5448 	return err;
5449 }
5450 
5451 static const struct got_error *
5452 close_diff_view(struct tog_view *view)
5453 {
5454 	const struct got_error *err = NULL;
5455 	struct tog_diff_view_state *s = &view->state.diff;
5456 
5457 	free(s->id1);
5458 	s->id1 = NULL;
5459 	free(s->id2);
5460 	s->id2 = NULL;
5461 	if (s->f && fclose(s->f) == EOF)
5462 		err = got_error_from_errno("fclose");
5463 	s->f = NULL;
5464 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5465 		err = got_error_from_errno("fclose");
5466 	s->f1 = NULL;
5467 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5468 		err = got_error_from_errno("fclose");
5469 	s->f2 = NULL;
5470 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5471 		err = got_error_from_errno("close");
5472 	s->fd1 = -1;
5473 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5474 		err = got_error_from_errno("close");
5475 	s->fd2 = -1;
5476 	free(s->lines);
5477 	s->lines = NULL;
5478 	s->nlines = 0;
5479 	return err;
5480 }
5481 
5482 static const struct got_error *
5483 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5484     struct got_object_id *id2, const char *label1, const char *label2,
5485     int diff_context, int ignore_whitespace, int force_text_diff,
5486     struct tog_view *parent_view, struct got_repository *repo)
5487 {
5488 	const struct got_error *err;
5489 	struct tog_diff_view_state *s = &view->state.diff;
5490 
5491 	memset(s, 0, sizeof(*s));
5492 	s->fd1 = -1;
5493 	s->fd2 = -1;
5494 
5495 	if (id1 != NULL && id2 != NULL) {
5496 		int type1, type2;
5497 
5498 		err = got_object_get_type(&type1, repo, id1);
5499 		if (err)
5500 			goto done;
5501 		err = got_object_get_type(&type2, repo, id2);
5502 		if (err)
5503 			goto done;
5504 
5505 		if (type1 != type2) {
5506 			err = got_error(GOT_ERR_OBJ_TYPE);
5507 			goto done;
5508 		}
5509 	}
5510 	s->first_displayed_line = 1;
5511 	s->last_displayed_line = view->nlines;
5512 	s->selected_line = 1;
5513 	s->repo = repo;
5514 	s->id1 = id1;
5515 	s->id2 = id2;
5516 	s->label1 = label1;
5517 	s->label2 = label2;
5518 
5519 	if (id1) {
5520 		s->id1 = got_object_id_dup(id1);
5521 		if (s->id1 == NULL) {
5522 			err = got_error_from_errno("got_object_id_dup");
5523 			goto done;
5524 		}
5525 	} else
5526 		s->id1 = NULL;
5527 
5528 	s->id2 = got_object_id_dup(id2);
5529 	if (s->id2 == NULL) {
5530 		err = got_error_from_errno("got_object_id_dup");
5531 		goto done;
5532 	}
5533 
5534 	s->f1 = got_opentemp();
5535 	if (s->f1 == NULL) {
5536 		err = got_error_from_errno("got_opentemp");
5537 		goto done;
5538 	}
5539 
5540 	s->f2 = got_opentemp();
5541 	if (s->f2 == NULL) {
5542 		err = got_error_from_errno("got_opentemp");
5543 		goto done;
5544 	}
5545 
5546 	s->fd1 = got_opentempfd();
5547 	if (s->fd1 == -1) {
5548 		err = got_error_from_errno("got_opentempfd");
5549 		goto done;
5550 	}
5551 
5552 	s->fd2 = got_opentempfd();
5553 	if (s->fd2 == -1) {
5554 		err = got_error_from_errno("got_opentempfd");
5555 		goto done;
5556 	}
5557 
5558 	s->diff_context = diff_context;
5559 	s->ignore_whitespace = ignore_whitespace;
5560 	s->force_text_diff = force_text_diff;
5561 	s->parent_view = parent_view;
5562 	s->repo = repo;
5563 
5564 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5565 		int rc;
5566 
5567 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5568 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5569 		if (rc != ERR)
5570 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5571 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5572 		if (rc != ERR)
5573 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5574 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5575 		if (rc != ERR)
5576 			rc = init_pair(GOT_DIFF_LINE_META,
5577 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5578 		if (rc != ERR)
5579 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5580 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5581 		if (rc != ERR)
5582 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5583 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5584 		if (rc != ERR)
5585 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5586 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5587 		if (rc != ERR)
5588 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5589 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5590 		if (rc != ERR)
5591 			rc = init_pair(GOT_DIFF_LINE_DATE,
5592 			    get_color_value("TOG_COLOR_DATE"), -1);
5593 		if (rc == ERR) {
5594 			err = got_error(GOT_ERR_RANGE);
5595 			goto done;
5596 		}
5597 	}
5598 
5599 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5600 	    view_is_splitscreen(view))
5601 		show_log_view(parent_view); /* draw border */
5602 	diff_view_indicate_progress(view);
5603 
5604 	err = create_diff(s);
5605 
5606 	view->show = show_diff_view;
5607 	view->input = input_diff_view;
5608 	view->reset = reset_diff_view;
5609 	view->close = close_diff_view;
5610 	view->search_start = search_start_diff_view;
5611 	view->search_setup = search_setup_diff_view;
5612 	view->search_next = search_next_view_match;
5613 done:
5614 	if (err) {
5615 		if (view->close == NULL)
5616 			close_diff_view(view);
5617 		view_close(view);
5618 	}
5619 	return err;
5620 }
5621 
5622 static const struct got_error *
5623 show_diff_view(struct tog_view *view)
5624 {
5625 	const struct got_error *err;
5626 	struct tog_diff_view_state *s = &view->state.diff;
5627 	char *id_str1 = NULL, *id_str2, *header;
5628 	const char *label1, *label2;
5629 
5630 	if (s->id1) {
5631 		err = got_object_id_str(&id_str1, s->id1);
5632 		if (err)
5633 			return err;
5634 		label1 = s->label1 ? s->label1 : id_str1;
5635 	} else
5636 		label1 = "/dev/null";
5637 
5638 	err = got_object_id_str(&id_str2, s->id2);
5639 	if (err)
5640 		return err;
5641 	label2 = s->label2 ? s->label2 : id_str2;
5642 
5643 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5644 		err = got_error_from_errno("asprintf");
5645 		free(id_str1);
5646 		free(id_str2);
5647 		return err;
5648 	}
5649 	free(id_str1);
5650 	free(id_str2);
5651 
5652 	err = draw_file(view, header);
5653 	free(header);
5654 	return err;
5655 }
5656 
5657 static const struct got_error *
5658 set_selected_commit(struct tog_diff_view_state *s,
5659     struct commit_queue_entry *entry)
5660 {
5661 	const struct got_error *err;
5662 	const struct got_object_id_queue *parent_ids;
5663 	struct got_commit_object *selected_commit;
5664 	struct got_object_qid *pid;
5665 
5666 	free(s->id2);
5667 	s->id2 = got_object_id_dup(entry->id);
5668 	if (s->id2 == NULL)
5669 		return got_error_from_errno("got_object_id_dup");
5670 
5671 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5672 	if (err)
5673 		return err;
5674 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5675 	free(s->id1);
5676 	pid = STAILQ_FIRST(parent_ids);
5677 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5678 	got_object_commit_close(selected_commit);
5679 	return NULL;
5680 }
5681 
5682 static const struct got_error *
5683 reset_diff_view(struct tog_view *view)
5684 {
5685 	struct tog_diff_view_state *s = &view->state.diff;
5686 
5687 	view->count = 0;
5688 	wclear(view->window);
5689 	s->first_displayed_line = 1;
5690 	s->last_displayed_line = view->nlines;
5691 	s->matched_line = 0;
5692 	diff_view_indicate_progress(view);
5693 	return create_diff(s);
5694 }
5695 
5696 static void
5697 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5698 {
5699 	int start, i;
5700 
5701 	i = start = s->first_displayed_line - 1;
5702 
5703 	while (s->lines[i].type != type) {
5704 		if (i == 0)
5705 			i = s->nlines - 1;
5706 		if (--i == start)
5707 			return; /* do nothing, requested type not in file */
5708 	}
5709 
5710 	s->selected_line = 1;
5711 	s->first_displayed_line = i;
5712 }
5713 
5714 static void
5715 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5716 {
5717 	int start, i;
5718 
5719 	i = start = s->first_displayed_line + 1;
5720 
5721 	while (s->lines[i].type != type) {
5722 		if (i == s->nlines - 1)
5723 			i = 0;
5724 		if (++i == start)
5725 			return; /* do nothing, requested type not in file */
5726 	}
5727 
5728 	s->selected_line = 1;
5729 	s->first_displayed_line = i;
5730 }
5731 
5732 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5733     int, int, int);
5734 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5735     int, int);
5736 
5737 static const struct got_error *
5738 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5739 {
5740 	const struct got_error *err = NULL;
5741 	struct tog_diff_view_state *s = &view->state.diff;
5742 	struct tog_log_view_state *ls;
5743 	struct commit_queue_entry *old_selected_entry;
5744 	char *line = NULL;
5745 	size_t linesize = 0;
5746 	ssize_t linelen;
5747 	int i, nscroll = view->nlines - 1, up = 0;
5748 
5749 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5750 
5751 	switch (ch) {
5752 	case '0':
5753 	case '$':
5754 	case KEY_RIGHT:
5755 	case 'l':
5756 	case KEY_LEFT:
5757 	case 'h':
5758 		horizontal_scroll_input(view, ch);
5759 		break;
5760 	case 'a':
5761 	case 'w':
5762 		if (ch == 'a') {
5763 			s->force_text_diff = !s->force_text_diff;
5764 			view->action = s->force_text_diff ?
5765 			    "force ASCII text enabled" :
5766 			    "force ASCII text disabled";
5767 		}
5768 		else if (ch == 'w') {
5769 			s->ignore_whitespace = !s->ignore_whitespace;
5770 			view->action = s->ignore_whitespace ?
5771 			    "ignore whitespace enabled" :
5772 			    "ignore whitespace disabled";
5773 		}
5774 		err = reset_diff_view(view);
5775 		break;
5776 	case 'g':
5777 	case KEY_HOME:
5778 		s->first_displayed_line = 1;
5779 		view->count = 0;
5780 		break;
5781 	case 'G':
5782 	case KEY_END:
5783 		view->count = 0;
5784 		if (s->eof)
5785 			break;
5786 
5787 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5788 		s->eof = 1;
5789 		break;
5790 	case 'k':
5791 	case KEY_UP:
5792 	case CTRL('p'):
5793 		if (s->first_displayed_line > 1)
5794 			s->first_displayed_line--;
5795 		else
5796 			view->count = 0;
5797 		break;
5798 	case CTRL('u'):
5799 	case 'u':
5800 		nscroll /= 2;
5801 		/* FALL THROUGH */
5802 	case KEY_PPAGE:
5803 	case CTRL('b'):
5804 	case 'b':
5805 		if (s->first_displayed_line == 1) {
5806 			view->count = 0;
5807 			break;
5808 		}
5809 		i = 0;
5810 		while (i++ < nscroll && s->first_displayed_line > 1)
5811 			s->first_displayed_line--;
5812 		break;
5813 	case 'j':
5814 	case KEY_DOWN:
5815 	case CTRL('n'):
5816 		if (!s->eof)
5817 			s->first_displayed_line++;
5818 		else
5819 			view->count = 0;
5820 		break;
5821 	case CTRL('d'):
5822 	case 'd':
5823 		nscroll /= 2;
5824 		/* FALL THROUGH */
5825 	case KEY_NPAGE:
5826 	case CTRL('f'):
5827 	case 'f':
5828 	case ' ':
5829 		if (s->eof) {
5830 			view->count = 0;
5831 			break;
5832 		}
5833 		i = 0;
5834 		while (!s->eof && i++ < nscroll) {
5835 			linelen = getline(&line, &linesize, s->f);
5836 			s->first_displayed_line++;
5837 			if (linelen == -1) {
5838 				if (feof(s->f)) {
5839 					s->eof = 1;
5840 				} else
5841 					err = got_ferror(s->f, GOT_ERR_IO);
5842 				break;
5843 			}
5844 		}
5845 		free(line);
5846 		break;
5847 	case '(':
5848 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5849 		break;
5850 	case ')':
5851 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5852 		break;
5853 	case '{':
5854 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5855 		break;
5856 	case '}':
5857 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5858 		break;
5859 	case '[':
5860 		if (s->diff_context > 0) {
5861 			s->diff_context--;
5862 			s->matched_line = 0;
5863 			diff_view_indicate_progress(view);
5864 			err = create_diff(s);
5865 			if (s->first_displayed_line + view->nlines - 1 >
5866 			    s->nlines) {
5867 				s->first_displayed_line = 1;
5868 				s->last_displayed_line = view->nlines;
5869 			}
5870 		} else
5871 			view->count = 0;
5872 		break;
5873 	case ']':
5874 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5875 			s->diff_context++;
5876 			s->matched_line = 0;
5877 			diff_view_indicate_progress(view);
5878 			err = create_diff(s);
5879 		} else
5880 			view->count = 0;
5881 		break;
5882 	case '<':
5883 	case ',':
5884 	case 'K':
5885 		up = 1;
5886 		/* FALL THROUGH */
5887 	case '>':
5888 	case '.':
5889 	case 'J':
5890 		if (s->parent_view == NULL) {
5891 			view->count = 0;
5892 			break;
5893 		}
5894 		s->parent_view->count = view->count;
5895 
5896 		if (s->parent_view->type == TOG_VIEW_LOG) {
5897 			ls = &s->parent_view->state.log;
5898 			old_selected_entry = ls->selected_entry;
5899 
5900 			err = input_log_view(NULL, s->parent_view,
5901 			    up ? KEY_UP : KEY_DOWN);
5902 			if (err)
5903 				break;
5904 			view->count = s->parent_view->count;
5905 
5906 			if (old_selected_entry == ls->selected_entry)
5907 				break;
5908 
5909 			err = set_selected_commit(s, ls->selected_entry);
5910 			if (err)
5911 				break;
5912 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5913 			struct tog_blame_view_state *bs;
5914 			struct got_object_id *id, *prev_id;
5915 
5916 			bs = &s->parent_view->state.blame;
5917 			prev_id = get_annotation_for_line(bs->blame.lines,
5918 			    bs->blame.nlines, bs->last_diffed_line);
5919 
5920 			err = input_blame_view(&view, s->parent_view,
5921 			    up ? KEY_UP : KEY_DOWN);
5922 			if (err)
5923 				break;
5924 			view->count = s->parent_view->count;
5925 
5926 			if (prev_id == NULL)
5927 				break;
5928 			id = get_selected_commit_id(bs->blame.lines,
5929 			    bs->blame.nlines, bs->first_displayed_line,
5930 			    bs->selected_line);
5931 			if (id == NULL)
5932 				break;
5933 
5934 			if (!got_object_id_cmp(prev_id, id))
5935 				break;
5936 
5937 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5938 			if (err)
5939 				break;
5940 		}
5941 		s->first_displayed_line = 1;
5942 		s->last_displayed_line = view->nlines;
5943 		s->matched_line = 0;
5944 		view->x = 0;
5945 
5946 		diff_view_indicate_progress(view);
5947 		err = create_diff(s);
5948 		break;
5949 	default:
5950 		view->count = 0;
5951 		break;
5952 	}
5953 
5954 	return err;
5955 }
5956 
5957 static const struct got_error *
5958 cmd_diff(int argc, char *argv[])
5959 {
5960 	const struct got_error *error;
5961 	struct got_repository *repo = NULL;
5962 	struct got_worktree *worktree = NULL;
5963 	struct got_object_id *id1 = NULL, *id2 = NULL;
5964 	char *repo_path = NULL, *cwd = NULL;
5965 	char *id_str1 = NULL, *id_str2 = NULL;
5966 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
5967 	char *label1 = NULL, *label2 = NULL;
5968 	int diff_context = 3, ignore_whitespace = 0;
5969 	int ch, force_text_diff = 0;
5970 	const char *errstr;
5971 	struct tog_view *view;
5972 	int *pack_fds = NULL;
5973 
5974 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5975 		switch (ch) {
5976 		case 'a':
5977 			force_text_diff = 1;
5978 			break;
5979 		case 'C':
5980 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5981 			    &errstr);
5982 			if (errstr != NULL)
5983 				errx(1, "number of context lines is %s: %s",
5984 				    errstr, errstr);
5985 			break;
5986 		case 'r':
5987 			repo_path = realpath(optarg, NULL);
5988 			if (repo_path == NULL)
5989 				return got_error_from_errno2("realpath",
5990 				    optarg);
5991 			got_path_strip_trailing_slashes(repo_path);
5992 			break;
5993 		case 'w':
5994 			ignore_whitespace = 1;
5995 			break;
5996 		default:
5997 			usage_diff();
5998 			/* NOTREACHED */
5999 		}
6000 	}
6001 
6002 	argc -= optind;
6003 	argv += optind;
6004 
6005 	if (argc == 0) {
6006 		usage_diff(); /* TODO show local worktree changes */
6007 	} else if (argc == 2) {
6008 		id_str1 = argv[0];
6009 		id_str2 = argv[1];
6010 	} else
6011 		usage_diff();
6012 
6013 	error = got_repo_pack_fds_open(&pack_fds);
6014 	if (error)
6015 		goto done;
6016 
6017 	if (repo_path == NULL) {
6018 		cwd = getcwd(NULL, 0);
6019 		if (cwd == NULL)
6020 			return got_error_from_errno("getcwd");
6021 		error = got_worktree_open(&worktree, cwd, NULL);
6022 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6023 			goto done;
6024 		if (worktree)
6025 			repo_path =
6026 			    strdup(got_worktree_get_repo_path(worktree));
6027 		else
6028 			repo_path = strdup(cwd);
6029 		if (repo_path == NULL) {
6030 			error = got_error_from_errno("strdup");
6031 			goto done;
6032 		}
6033 	}
6034 
6035 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6036 	if (error)
6037 		goto done;
6038 
6039 	init_curses();
6040 
6041 	error = apply_unveil(got_repo_get_path(repo), NULL);
6042 	if (error)
6043 		goto done;
6044 
6045 	error = tog_load_refs(repo, 0);
6046 	if (error)
6047 		goto done;
6048 
6049 	if (id_str1 != NULL) {
6050 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6051 		    repo, worktree);
6052 		if (error != NULL)
6053 			goto done;
6054 		if (keyword_idstr1 != NULL)
6055 			id_str1 = keyword_idstr1;
6056 	}
6057 	if (id_str2 != NULL) {
6058 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6059 		    repo, worktree);
6060 		if (error != NULL)
6061 			goto done;
6062 		if (keyword_idstr2 != NULL)
6063 			id_str2 = keyword_idstr2;
6064 	}
6065 
6066 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6067 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6068 	if (error)
6069 		goto done;
6070 
6071 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6072 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6073 	if (error)
6074 		goto done;
6075 
6076 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6077 	if (view == NULL) {
6078 		error = got_error_from_errno("view_open");
6079 		goto done;
6080 	}
6081 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6082 	    ignore_whitespace, force_text_diff, NULL,  repo);
6083 	if (error)
6084 		goto done;
6085 
6086 	if (worktree) {
6087 		error = set_tog_base_commit(repo, worktree);
6088 		if (error != NULL)
6089 			goto done;
6090 	}
6091 
6092 	error = view_loop(view);
6093 
6094 done:
6095 	free(tog_base_commit.id);
6096 	free(keyword_idstr1);
6097 	free(keyword_idstr2);
6098 	free(label1);
6099 	free(label2);
6100 	free(repo_path);
6101 	free(cwd);
6102 	if (repo) {
6103 		const struct got_error *close_err = got_repo_close(repo);
6104 		if (error == NULL)
6105 			error = close_err;
6106 	}
6107 	if (worktree)
6108 		got_worktree_close(worktree);
6109 	if (pack_fds) {
6110 		const struct got_error *pack_err =
6111 		    got_repo_pack_fds_close(pack_fds);
6112 		if (error == NULL)
6113 			error = pack_err;
6114 	}
6115 	tog_free_refs();
6116 	return error;
6117 }
6118 
6119 __dead static void
6120 usage_blame(void)
6121 {
6122 	endwin();
6123 	fprintf(stderr,
6124 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6125 	    getprogname());
6126 	exit(1);
6127 }
6128 
6129 struct tog_blame_line {
6130 	int annotated;
6131 	struct got_object_id *id;
6132 };
6133 
6134 static const struct got_error *
6135 draw_blame(struct tog_view *view)
6136 {
6137 	struct tog_blame_view_state *s = &view->state.blame;
6138 	struct tog_blame *blame = &s->blame;
6139 	regmatch_t *regmatch = &view->regmatch;
6140 	const struct got_error *err;
6141 	int lineno = 0, nprinted = 0;
6142 	char *line = NULL;
6143 	size_t linesize = 0;
6144 	ssize_t linelen;
6145 	wchar_t *wline;
6146 	int width;
6147 	struct tog_blame_line *blame_line;
6148 	struct got_object_id *prev_id = NULL;
6149 	char *id_str;
6150 	struct tog_color *tc;
6151 
6152 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6153 	if (err)
6154 		return err;
6155 
6156 	rewind(blame->f);
6157 	werase(view->window);
6158 
6159 	if (asprintf(&line, "commit %s", id_str) == -1) {
6160 		err = got_error_from_errno("asprintf");
6161 		free(id_str);
6162 		return err;
6163 	}
6164 
6165 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6166 	free(line);
6167 	line = NULL;
6168 	if (err)
6169 		return err;
6170 	if (view_needs_focus_indication(view))
6171 		wstandout(view->window);
6172 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6173 	if (tc)
6174 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6175 	waddwstr(view->window, wline);
6176 	while (width++ < view->ncols)
6177 		waddch(view->window, ' ');
6178 	if (tc)
6179 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6180 	if (view_needs_focus_indication(view))
6181 		wstandend(view->window);
6182 	free(wline);
6183 	wline = NULL;
6184 
6185 	if (view->gline > blame->nlines)
6186 		view->gline = blame->nlines;
6187 
6188 	if (tog_io.wait_for_ui) {
6189 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6190 		int rc;
6191 
6192 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6193 		if (rc)
6194 			return got_error_set_errno(rc, "pthread_cond_wait");
6195 		tog_io.wait_for_ui = 0;
6196 	}
6197 
6198 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6199 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6200 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6201 		free(id_str);
6202 		return got_error_from_errno("asprintf");
6203 	}
6204 	free(id_str);
6205 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6206 	free(line);
6207 	line = NULL;
6208 	if (err)
6209 		return err;
6210 	waddwstr(view->window, wline);
6211 	free(wline);
6212 	wline = NULL;
6213 	if (width < view->ncols - 1)
6214 		waddch(view->window, '\n');
6215 
6216 	s->eof = 0;
6217 	view->maxx = 0;
6218 	while (nprinted < view->nlines - 2) {
6219 		linelen = getline(&line, &linesize, blame->f);
6220 		if (linelen == -1) {
6221 			if (feof(blame->f)) {
6222 				s->eof = 1;
6223 				break;
6224 			}
6225 			free(line);
6226 			return got_ferror(blame->f, GOT_ERR_IO);
6227 		}
6228 		if (++lineno < s->first_displayed_line)
6229 			continue;
6230 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6231 			continue;
6232 
6233 		/* Set view->maxx based on full line length. */
6234 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6235 		if (err) {
6236 			free(line);
6237 			return err;
6238 		}
6239 		free(wline);
6240 		wline = NULL;
6241 		view->maxx = MAX(view->maxx, width);
6242 
6243 		if (nprinted == s->selected_line - 1)
6244 			wstandout(view->window);
6245 
6246 		if (blame->nlines > 0) {
6247 			blame_line = &blame->lines[lineno - 1];
6248 			if (blame_line->annotated && prev_id &&
6249 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6250 			    !(nprinted == s->selected_line - 1)) {
6251 				waddstr(view->window, "        ");
6252 			} else if (blame_line->annotated) {
6253 				char *id_str;
6254 				err = got_object_id_str(&id_str,
6255 				    blame_line->id);
6256 				if (err) {
6257 					free(line);
6258 					return err;
6259 				}
6260 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6261 				if (tc)
6262 					wattr_on(view->window,
6263 					    COLOR_PAIR(tc->colorpair), NULL);
6264 				wprintw(view->window, "%.8s", id_str);
6265 				if (tc)
6266 					wattr_off(view->window,
6267 					    COLOR_PAIR(tc->colorpair), NULL);
6268 				free(id_str);
6269 				prev_id = blame_line->id;
6270 			} else {
6271 				waddstr(view->window, "........");
6272 				prev_id = NULL;
6273 			}
6274 		} else {
6275 			waddstr(view->window, "........");
6276 			prev_id = NULL;
6277 		}
6278 
6279 		if (nprinted == s->selected_line - 1)
6280 			wstandend(view->window);
6281 		waddstr(view->window, " ");
6282 
6283 		if (view->ncols <= 9) {
6284 			width = 9;
6285 		} else if (s->first_displayed_line + nprinted ==
6286 		    s->matched_line &&
6287 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6288 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6289 			    view->window, view->x, regmatch);
6290 			if (err) {
6291 				free(line);
6292 				return err;
6293 			}
6294 			width += 9;
6295 		} else {
6296 			int skip;
6297 			err = format_line(&wline, &width, &skip, line,
6298 			    view->x, view->ncols - 9, 9, 1);
6299 			if (err) {
6300 				free(line);
6301 				return err;
6302 			}
6303 			waddwstr(view->window, &wline[skip]);
6304 			width += 9;
6305 			free(wline);
6306 			wline = NULL;
6307 		}
6308 
6309 		if (width <= view->ncols - 1)
6310 			waddch(view->window, '\n');
6311 		if (++nprinted == 1)
6312 			s->first_displayed_line = lineno;
6313 	}
6314 	free(line);
6315 	s->last_displayed_line = lineno;
6316 
6317 	view_border(view);
6318 
6319 	return NULL;
6320 }
6321 
6322 static const struct got_error *
6323 blame_cb(void *arg, int nlines, int lineno,
6324     struct got_commit_object *commit, struct got_object_id *id)
6325 {
6326 	const struct got_error *err = NULL;
6327 	struct tog_blame_cb_args *a = arg;
6328 	struct tog_blame_line *line;
6329 	int errcode;
6330 
6331 	if (nlines != a->nlines ||
6332 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6333 		return got_error(GOT_ERR_RANGE);
6334 
6335 	errcode = pthread_mutex_lock(&tog_mutex);
6336 	if (errcode)
6337 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6338 
6339 	if (*a->quit) {	/* user has quit the blame view */
6340 		err = got_error(GOT_ERR_ITER_COMPLETED);
6341 		goto done;
6342 	}
6343 
6344 	if (lineno == -1)
6345 		goto done; /* no change in this commit */
6346 
6347 	line = &a->lines[lineno - 1];
6348 	if (line->annotated)
6349 		goto done;
6350 
6351 	line->id = got_object_id_dup(id);
6352 	if (line->id == NULL) {
6353 		err = got_error_from_errno("got_object_id_dup");
6354 		goto done;
6355 	}
6356 	line->annotated = 1;
6357 done:
6358 	errcode = pthread_mutex_unlock(&tog_mutex);
6359 	if (errcode)
6360 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6361 	return err;
6362 }
6363 
6364 static void *
6365 blame_thread(void *arg)
6366 {
6367 	const struct got_error *err, *close_err;
6368 	struct tog_blame_thread_args *ta = arg;
6369 	struct tog_blame_cb_args *a = ta->cb_args;
6370 	int errcode, fd1 = -1, fd2 = -1;
6371 	FILE *f1 = NULL, *f2 = NULL;
6372 
6373 	fd1 = got_opentempfd();
6374 	if (fd1 == -1)
6375 		return (void *)got_error_from_errno("got_opentempfd");
6376 
6377 	fd2 = got_opentempfd();
6378 	if (fd2 == -1) {
6379 		err = got_error_from_errno("got_opentempfd");
6380 		goto done;
6381 	}
6382 
6383 	f1 = got_opentemp();
6384 	if (f1 == NULL) {
6385 		err = (void *)got_error_from_errno("got_opentemp");
6386 		goto done;
6387 	}
6388 	f2 = got_opentemp();
6389 	if (f2 == NULL) {
6390 		err = (void *)got_error_from_errno("got_opentemp");
6391 		goto done;
6392 	}
6393 
6394 	err = block_signals_used_by_main_thread();
6395 	if (err)
6396 		goto done;
6397 
6398 	err = got_blame(ta->path, a->commit_id, ta->repo,
6399 	    tog_diff_algo, blame_cb, ta->cb_args,
6400 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6401 	if (err && err->code == GOT_ERR_CANCELLED)
6402 		err = NULL;
6403 
6404 	errcode = pthread_mutex_lock(&tog_mutex);
6405 	if (errcode) {
6406 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6407 		goto done;
6408 	}
6409 
6410 	close_err = got_repo_close(ta->repo);
6411 	if (err == NULL)
6412 		err = close_err;
6413 	ta->repo = NULL;
6414 	*ta->complete = 1;
6415 
6416 	if (tog_io.wait_for_ui) {
6417 		errcode = pthread_cond_signal(&ta->blame_complete);
6418 		if (errcode && err == NULL)
6419 			err = got_error_set_errno(errcode,
6420 			    "pthread_cond_signal");
6421 	}
6422 
6423 	errcode = pthread_mutex_unlock(&tog_mutex);
6424 	if (errcode && err == NULL)
6425 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6426 
6427 done:
6428 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6429 		err = got_error_from_errno("close");
6430 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6431 		err = got_error_from_errno("close");
6432 	if (f1 && fclose(f1) == EOF && err == NULL)
6433 		err = got_error_from_errno("fclose");
6434 	if (f2 && fclose(f2) == EOF && err == NULL)
6435 		err = got_error_from_errno("fclose");
6436 
6437 	return (void *)err;
6438 }
6439 
6440 static struct got_object_id *
6441 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6442     int first_displayed_line, int selected_line)
6443 {
6444 	struct tog_blame_line *line;
6445 
6446 	if (nlines <= 0)
6447 		return NULL;
6448 
6449 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6450 	if (!line->annotated)
6451 		return NULL;
6452 
6453 	return line->id;
6454 }
6455 
6456 static struct got_object_id *
6457 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6458     int lineno)
6459 {
6460 	struct tog_blame_line *line;
6461 
6462 	if (nlines <= 0 || lineno >= nlines)
6463 		return NULL;
6464 
6465 	line = &lines[lineno - 1];
6466 	if (!line->annotated)
6467 		return NULL;
6468 
6469 	return line->id;
6470 }
6471 
6472 static const struct got_error *
6473 stop_blame(struct tog_blame *blame)
6474 {
6475 	const struct got_error *err = NULL;
6476 	int i;
6477 
6478 	if (blame->thread) {
6479 		int errcode;
6480 		errcode = pthread_mutex_unlock(&tog_mutex);
6481 		if (errcode)
6482 			return got_error_set_errno(errcode,
6483 			    "pthread_mutex_unlock");
6484 		errcode = pthread_join(blame->thread, (void **)&err);
6485 		if (errcode)
6486 			return got_error_set_errno(errcode, "pthread_join");
6487 		errcode = pthread_mutex_lock(&tog_mutex);
6488 		if (errcode)
6489 			return got_error_set_errno(errcode,
6490 			    "pthread_mutex_lock");
6491 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6492 			err = NULL;
6493 		blame->thread = NULL;
6494 	}
6495 	if (blame->thread_args.repo) {
6496 		const struct got_error *close_err;
6497 		close_err = got_repo_close(blame->thread_args.repo);
6498 		if (err == NULL)
6499 			err = close_err;
6500 		blame->thread_args.repo = NULL;
6501 	}
6502 	if (blame->f) {
6503 		if (fclose(blame->f) == EOF && err == NULL)
6504 			err = got_error_from_errno("fclose");
6505 		blame->f = NULL;
6506 	}
6507 	if (blame->lines) {
6508 		for (i = 0; i < blame->nlines; i++)
6509 			free(blame->lines[i].id);
6510 		free(blame->lines);
6511 		blame->lines = NULL;
6512 	}
6513 	free(blame->cb_args.commit_id);
6514 	blame->cb_args.commit_id = NULL;
6515 	if (blame->pack_fds) {
6516 		const struct got_error *pack_err =
6517 		    got_repo_pack_fds_close(blame->pack_fds);
6518 		if (err == NULL)
6519 			err = pack_err;
6520 		blame->pack_fds = NULL;
6521 	}
6522 	return err;
6523 }
6524 
6525 static const struct got_error *
6526 cancel_blame_view(void *arg)
6527 {
6528 	const struct got_error *err = NULL;
6529 	int *done = arg;
6530 	int errcode;
6531 
6532 	errcode = pthread_mutex_lock(&tog_mutex);
6533 	if (errcode)
6534 		return got_error_set_errno(errcode,
6535 		    "pthread_mutex_unlock");
6536 
6537 	if (*done)
6538 		err = got_error(GOT_ERR_CANCELLED);
6539 
6540 	errcode = pthread_mutex_unlock(&tog_mutex);
6541 	if (errcode)
6542 		return got_error_set_errno(errcode,
6543 		    "pthread_mutex_lock");
6544 
6545 	return err;
6546 }
6547 
6548 static const struct got_error *
6549 run_blame(struct tog_view *view)
6550 {
6551 	struct tog_blame_view_state *s = &view->state.blame;
6552 	struct tog_blame *blame = &s->blame;
6553 	const struct got_error *err = NULL;
6554 	struct got_commit_object *commit = NULL;
6555 	struct got_blob_object *blob = NULL;
6556 	struct got_repository *thread_repo = NULL;
6557 	struct got_object_id *obj_id = NULL;
6558 	int obj_type, fd = -1;
6559 	int *pack_fds = NULL;
6560 
6561 	err = got_object_open_as_commit(&commit, s->repo,
6562 	    &s->blamed_commit->id);
6563 	if (err)
6564 		return err;
6565 
6566 	fd = got_opentempfd();
6567 	if (fd == -1) {
6568 		err = got_error_from_errno("got_opentempfd");
6569 		goto done;
6570 	}
6571 
6572 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6573 	if (err)
6574 		goto done;
6575 
6576 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6577 	if (err)
6578 		goto done;
6579 
6580 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6581 		err = got_error(GOT_ERR_OBJ_TYPE);
6582 		goto done;
6583 	}
6584 
6585 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6586 	if (err)
6587 		goto done;
6588 	blame->f = got_opentemp();
6589 	if (blame->f == NULL) {
6590 		err = got_error_from_errno("got_opentemp");
6591 		goto done;
6592 	}
6593 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6594 	    &blame->line_offsets, blame->f, blob);
6595 	if (err)
6596 		goto done;
6597 	if (blame->nlines == 0) {
6598 		s->blame_complete = 1;
6599 		goto done;
6600 	}
6601 
6602 	/* Don't include \n at EOF in the blame line count. */
6603 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6604 		blame->nlines--;
6605 
6606 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6607 	if (blame->lines == NULL) {
6608 		err = got_error_from_errno("calloc");
6609 		goto done;
6610 	}
6611 
6612 	err = got_repo_pack_fds_open(&pack_fds);
6613 	if (err)
6614 		goto done;
6615 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6616 	    pack_fds);
6617 	if (err)
6618 		goto done;
6619 
6620 	blame->pack_fds = pack_fds;
6621 	blame->cb_args.view = view;
6622 	blame->cb_args.lines = blame->lines;
6623 	blame->cb_args.nlines = blame->nlines;
6624 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6625 	if (blame->cb_args.commit_id == NULL) {
6626 		err = got_error_from_errno("got_object_id_dup");
6627 		goto done;
6628 	}
6629 	blame->cb_args.quit = &s->done;
6630 
6631 	blame->thread_args.path = s->path;
6632 	blame->thread_args.repo = thread_repo;
6633 	blame->thread_args.cb_args = &blame->cb_args;
6634 	blame->thread_args.complete = &s->blame_complete;
6635 	blame->thread_args.cancel_cb = cancel_blame_view;
6636 	blame->thread_args.cancel_arg = &s->done;
6637 	s->blame_complete = 0;
6638 
6639 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6640 		s->first_displayed_line = 1;
6641 		s->last_displayed_line = view->nlines;
6642 		s->selected_line = 1;
6643 	}
6644 	s->matched_line = 0;
6645 
6646 done:
6647 	if (commit)
6648 		got_object_commit_close(commit);
6649 	if (fd != -1 && close(fd) == -1 && err == NULL)
6650 		err = got_error_from_errno("close");
6651 	if (blob)
6652 		got_object_blob_close(blob);
6653 	free(obj_id);
6654 	if (err)
6655 		stop_blame(blame);
6656 	return err;
6657 }
6658 
6659 static const struct got_error *
6660 open_blame_view(struct tog_view *view, char *path,
6661     struct got_object_id *commit_id, struct got_repository *repo)
6662 {
6663 	const struct got_error *err = NULL;
6664 	struct tog_blame_view_state *s = &view->state.blame;
6665 
6666 	STAILQ_INIT(&s->blamed_commits);
6667 
6668 	s->path = strdup(path);
6669 	if (s->path == NULL)
6670 		return got_error_from_errno("strdup");
6671 
6672 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6673 	if (err) {
6674 		free(s->path);
6675 		return err;
6676 	}
6677 
6678 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6679 	s->first_displayed_line = 1;
6680 	s->last_displayed_line = view->nlines;
6681 	s->selected_line = 1;
6682 	s->blame_complete = 0;
6683 	s->repo = repo;
6684 	s->commit_id = commit_id;
6685 	memset(&s->blame, 0, sizeof(s->blame));
6686 
6687 	STAILQ_INIT(&s->colors);
6688 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6689 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6690 		    get_color_value("TOG_COLOR_COMMIT"));
6691 		if (err)
6692 			return err;
6693 	}
6694 
6695 	view->show = show_blame_view;
6696 	view->input = input_blame_view;
6697 	view->reset = reset_blame_view;
6698 	view->close = close_blame_view;
6699 	view->search_start = search_start_blame_view;
6700 	view->search_setup = search_setup_blame_view;
6701 	view->search_next = search_next_view_match;
6702 
6703 	if (using_mock_io) {
6704 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6705 		int rc;
6706 
6707 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6708 		if (rc)
6709 			return got_error_set_errno(rc, "pthread_cond_init");
6710 	}
6711 
6712 	return run_blame(view);
6713 }
6714 
6715 static const struct got_error *
6716 close_blame_view(struct tog_view *view)
6717 {
6718 	const struct got_error *err = NULL;
6719 	struct tog_blame_view_state *s = &view->state.blame;
6720 
6721 	if (s->blame.thread)
6722 		err = stop_blame(&s->blame);
6723 
6724 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6725 		struct got_object_qid *blamed_commit;
6726 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6727 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6728 		got_object_qid_free(blamed_commit);
6729 	}
6730 
6731 	if (using_mock_io) {
6732 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6733 		int rc;
6734 
6735 		rc = pthread_cond_destroy(&bta->blame_complete);
6736 		if (rc && err == NULL)
6737 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6738 	}
6739 
6740 	free(s->path);
6741 	free_colors(&s->colors);
6742 	return err;
6743 }
6744 
6745 static const struct got_error *
6746 search_start_blame_view(struct tog_view *view)
6747 {
6748 	struct tog_blame_view_state *s = &view->state.blame;
6749 
6750 	s->matched_line = 0;
6751 	return NULL;
6752 }
6753 
6754 static void
6755 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6756     size_t *nlines, int **first, int **last, int **match, int **selected)
6757 {
6758 	struct tog_blame_view_state *s = &view->state.blame;
6759 
6760 	*f = s->blame.f;
6761 	*nlines = s->blame.nlines;
6762 	*line_offsets = s->blame.line_offsets;
6763 	*match = &s->matched_line;
6764 	*first = &s->first_displayed_line;
6765 	*last = &s->last_displayed_line;
6766 	*selected = &s->selected_line;
6767 }
6768 
6769 static const struct got_error *
6770 show_blame_view(struct tog_view *view)
6771 {
6772 	const struct got_error *err = NULL;
6773 	struct tog_blame_view_state *s = &view->state.blame;
6774 	int errcode;
6775 
6776 	if (s->blame.thread == NULL && !s->blame_complete) {
6777 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6778 		    &s->blame.thread_args);
6779 		if (errcode)
6780 			return got_error_set_errno(errcode, "pthread_create");
6781 
6782 		if (!using_mock_io)
6783 			halfdelay(1); /* fast refresh while annotating  */
6784 	}
6785 
6786 	if (s->blame_complete && !using_mock_io)
6787 		halfdelay(10); /* disable fast refresh */
6788 
6789 	err = draw_blame(view);
6790 
6791 	view_border(view);
6792 	return err;
6793 }
6794 
6795 static const struct got_error *
6796 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6797     struct got_repository *repo, struct got_object_id *id)
6798 {
6799 	struct tog_view		*log_view;
6800 	const struct got_error	*err = NULL;
6801 
6802 	*new_view = NULL;
6803 
6804 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6805 	if (log_view == NULL)
6806 		return got_error_from_errno("view_open");
6807 
6808 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6809 	if (err)
6810 		view_close(log_view);
6811 	else
6812 		*new_view = log_view;
6813 
6814 	return err;
6815 }
6816 
6817 static const struct got_error *
6818 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6819 {
6820 	const struct got_error *err = NULL, *thread_err = NULL;
6821 	struct tog_view *diff_view;
6822 	struct tog_blame_view_state *s = &view->state.blame;
6823 	int eos, nscroll, begin_y = 0, begin_x = 0;
6824 
6825 	eos = nscroll = view->nlines - 2;
6826 	if (view_is_hsplit_top(view))
6827 		--eos;  /* border */
6828 
6829 	switch (ch) {
6830 	case '0':
6831 	case '$':
6832 	case KEY_RIGHT:
6833 	case 'l':
6834 	case KEY_LEFT:
6835 	case 'h':
6836 		horizontal_scroll_input(view, ch);
6837 		break;
6838 	case 'q':
6839 		s->done = 1;
6840 		break;
6841 	case 'g':
6842 	case KEY_HOME:
6843 		s->selected_line = 1;
6844 		s->first_displayed_line = 1;
6845 		view->count = 0;
6846 		break;
6847 	case 'G':
6848 	case KEY_END:
6849 		if (s->blame.nlines < eos) {
6850 			s->selected_line = s->blame.nlines;
6851 			s->first_displayed_line = 1;
6852 		} else {
6853 			s->selected_line = eos;
6854 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6855 		}
6856 		view->count = 0;
6857 		break;
6858 	case 'k':
6859 	case KEY_UP:
6860 	case CTRL('p'):
6861 		if (s->selected_line > 1)
6862 			s->selected_line--;
6863 		else if (s->selected_line == 1 &&
6864 		    s->first_displayed_line > 1)
6865 			s->first_displayed_line--;
6866 		else
6867 			view->count = 0;
6868 		break;
6869 	case CTRL('u'):
6870 	case 'u':
6871 		nscroll /= 2;
6872 		/* FALL THROUGH */
6873 	case KEY_PPAGE:
6874 	case CTRL('b'):
6875 	case 'b':
6876 		if (s->first_displayed_line == 1) {
6877 			if (view->count > 1)
6878 				nscroll += nscroll;
6879 			s->selected_line = MAX(1, s->selected_line - nscroll);
6880 			view->count = 0;
6881 			break;
6882 		}
6883 		if (s->first_displayed_line > nscroll)
6884 			s->first_displayed_line -= nscroll;
6885 		else
6886 			s->first_displayed_line = 1;
6887 		break;
6888 	case 'j':
6889 	case KEY_DOWN:
6890 	case CTRL('n'):
6891 		if (s->selected_line < eos && s->first_displayed_line +
6892 		    s->selected_line <= s->blame.nlines)
6893 			s->selected_line++;
6894 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6895 			s->first_displayed_line++;
6896 		else
6897 			view->count = 0;
6898 		break;
6899 	case 'c':
6900 	case 'p': {
6901 		struct got_object_id *id = NULL;
6902 
6903 		view->count = 0;
6904 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6905 		    s->first_displayed_line, s->selected_line);
6906 		if (id == NULL)
6907 			break;
6908 		if (ch == 'p') {
6909 			struct got_commit_object *commit, *pcommit;
6910 			struct got_object_qid *pid;
6911 			struct got_object_id *blob_id = NULL;
6912 			int obj_type;
6913 			err = got_object_open_as_commit(&commit,
6914 			    s->repo, id);
6915 			if (err)
6916 				break;
6917 			pid = STAILQ_FIRST(
6918 			    got_object_commit_get_parent_ids(commit));
6919 			if (pid == NULL) {
6920 				got_object_commit_close(commit);
6921 				break;
6922 			}
6923 			/* Check if path history ends here. */
6924 			err = got_object_open_as_commit(&pcommit,
6925 			    s->repo, &pid->id);
6926 			if (err)
6927 				break;
6928 			err = got_object_id_by_path(&blob_id, s->repo,
6929 			    pcommit, s->path);
6930 			got_object_commit_close(pcommit);
6931 			if (err) {
6932 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6933 					err = NULL;
6934 				got_object_commit_close(commit);
6935 				break;
6936 			}
6937 			err = got_object_get_type(&obj_type, s->repo,
6938 			    blob_id);
6939 			free(blob_id);
6940 			/* Can't blame non-blob type objects. */
6941 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6942 				got_object_commit_close(commit);
6943 				break;
6944 			}
6945 			err = got_object_qid_alloc(&s->blamed_commit,
6946 			    &pid->id);
6947 			got_object_commit_close(commit);
6948 		} else {
6949 			if (got_object_id_cmp(id,
6950 			    &s->blamed_commit->id) == 0)
6951 				break;
6952 			err = got_object_qid_alloc(&s->blamed_commit,
6953 			    id);
6954 		}
6955 		if (err)
6956 			break;
6957 		s->done = 1;
6958 		thread_err = stop_blame(&s->blame);
6959 		s->done = 0;
6960 		if (thread_err)
6961 			break;
6962 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6963 		    s->blamed_commit, entry);
6964 		err = run_blame(view);
6965 		if (err)
6966 			break;
6967 		break;
6968 	}
6969 	case 'C': {
6970 		struct got_object_qid *first;
6971 
6972 		view->count = 0;
6973 		first = STAILQ_FIRST(&s->blamed_commits);
6974 		if (!got_object_id_cmp(&first->id, s->commit_id))
6975 			break;
6976 		s->done = 1;
6977 		thread_err = stop_blame(&s->blame);
6978 		s->done = 0;
6979 		if (thread_err)
6980 			break;
6981 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6982 		got_object_qid_free(s->blamed_commit);
6983 		s->blamed_commit =
6984 		    STAILQ_FIRST(&s->blamed_commits);
6985 		err = run_blame(view);
6986 		if (err)
6987 			break;
6988 		break;
6989 	}
6990 	case 'L':
6991 		view->count = 0;
6992 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6993 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6994 		if (s->id_to_log)
6995 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6996 		break;
6997 	case KEY_ENTER:
6998 	case '\r': {
6999 		struct got_object_id *id = NULL;
7000 		struct got_object_qid *pid;
7001 		struct got_commit_object *commit = NULL;
7002 
7003 		view->count = 0;
7004 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7005 		    s->first_displayed_line, s->selected_line);
7006 		if (id == NULL)
7007 			break;
7008 		err = got_object_open_as_commit(&commit, s->repo, id);
7009 		if (err)
7010 			break;
7011 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7012 		if (*new_view) {
7013 			/* traversed from diff view, release diff resources  */
7014 			err = close_diff_view(*new_view);
7015 			if (err)
7016 				break;
7017 			diff_view = *new_view;
7018 		} else {
7019 			if (view_is_parent_view(view))
7020 				view_get_split(view, &begin_y, &begin_x);
7021 
7022 			diff_view = view_open(0, 0, begin_y, begin_x,
7023 			    TOG_VIEW_DIFF);
7024 			if (diff_view == NULL) {
7025 				got_object_commit_close(commit);
7026 				err = got_error_from_errno("view_open");
7027 				break;
7028 			}
7029 		}
7030 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7031 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7032 		got_object_commit_close(commit);
7033 		if (err)
7034 			break;
7035 		s->last_diffed_line = s->first_displayed_line - 1 +
7036 		    s->selected_line;
7037 		if (*new_view)
7038 			break;	/* still open from active diff view */
7039 		if (view_is_parent_view(view) &&
7040 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7041 			err = view_init_hsplit(view, begin_y);
7042 			if (err)
7043 				break;
7044 		}
7045 
7046 		view->focussed = 0;
7047 		diff_view->focussed = 1;
7048 		diff_view->mode = view->mode;
7049 		diff_view->nlines = view->lines - begin_y;
7050 		if (view_is_parent_view(view)) {
7051 			view_transfer_size(diff_view, view);
7052 			err = view_close_child(view);
7053 			if (err)
7054 				break;
7055 			err = view_set_child(view, diff_view);
7056 			if (err)
7057 				break;
7058 			view->focus_child = 1;
7059 		} else
7060 			*new_view = diff_view;
7061 		if (err)
7062 			break;
7063 		break;
7064 	}
7065 	case CTRL('d'):
7066 	case 'd':
7067 		nscroll /= 2;
7068 		/* FALL THROUGH */
7069 	case KEY_NPAGE:
7070 	case CTRL('f'):
7071 	case 'f':
7072 	case ' ':
7073 		if (s->last_displayed_line >= s->blame.nlines &&
7074 		    s->selected_line >= MIN(s->blame.nlines,
7075 		    view->nlines - 2)) {
7076 			view->count = 0;
7077 			break;
7078 		}
7079 		if (s->last_displayed_line >= s->blame.nlines &&
7080 		    s->selected_line < view->nlines - 2) {
7081 			s->selected_line +=
7082 			    MIN(nscroll, s->last_displayed_line -
7083 			    s->first_displayed_line - s->selected_line + 1);
7084 		}
7085 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7086 			s->first_displayed_line += nscroll;
7087 		else
7088 			s->first_displayed_line =
7089 			    s->blame.nlines - (view->nlines - 3);
7090 		break;
7091 	case KEY_RESIZE:
7092 		if (s->selected_line > view->nlines - 2) {
7093 			s->selected_line = MIN(s->blame.nlines,
7094 			    view->nlines - 2);
7095 		}
7096 		break;
7097 	default:
7098 		view->count = 0;
7099 		break;
7100 	}
7101 	return thread_err ? thread_err : err;
7102 }
7103 
7104 static const struct got_error *
7105 reset_blame_view(struct tog_view *view)
7106 {
7107 	const struct got_error *err;
7108 	struct tog_blame_view_state *s = &view->state.blame;
7109 
7110 	view->count = 0;
7111 	s->done = 1;
7112 	err = stop_blame(&s->blame);
7113 	s->done = 0;
7114 	if (err)
7115 		return err;
7116 	return run_blame(view);
7117 }
7118 
7119 static const struct got_error *
7120 cmd_blame(int argc, char *argv[])
7121 {
7122 	const struct got_error *error;
7123 	struct got_repository *repo = NULL;
7124 	struct got_worktree *worktree = NULL;
7125 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7126 	char *link_target = NULL;
7127 	struct got_object_id *commit_id = NULL;
7128 	struct got_commit_object *commit = NULL;
7129 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7130 	int ch;
7131 	struct tog_view *view = NULL;
7132 	int *pack_fds = NULL;
7133 
7134 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7135 		switch (ch) {
7136 		case 'c':
7137 			commit_id_str = optarg;
7138 			break;
7139 		case 'r':
7140 			repo_path = realpath(optarg, NULL);
7141 			if (repo_path == NULL)
7142 				return got_error_from_errno2("realpath",
7143 				    optarg);
7144 			break;
7145 		default:
7146 			usage_blame();
7147 			/* NOTREACHED */
7148 		}
7149 	}
7150 
7151 	argc -= optind;
7152 	argv += optind;
7153 
7154 	if (argc != 1)
7155 		usage_blame();
7156 
7157 	error = got_repo_pack_fds_open(&pack_fds);
7158 	if (error != NULL)
7159 		goto done;
7160 
7161 	if (repo_path == NULL) {
7162 		cwd = getcwd(NULL, 0);
7163 		if (cwd == NULL)
7164 			return got_error_from_errno("getcwd");
7165 		error = got_worktree_open(&worktree, cwd, NULL);
7166 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7167 			goto done;
7168 		if (worktree)
7169 			repo_path =
7170 			    strdup(got_worktree_get_repo_path(worktree));
7171 		else
7172 			repo_path = strdup(cwd);
7173 		if (repo_path == NULL) {
7174 			error = got_error_from_errno("strdup");
7175 			goto done;
7176 		}
7177 	}
7178 
7179 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7180 	if (error != NULL)
7181 		goto done;
7182 
7183 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7184 	    worktree);
7185 	if (error)
7186 		goto done;
7187 
7188 	init_curses();
7189 
7190 	error = apply_unveil(got_repo_get_path(repo), NULL);
7191 	if (error)
7192 		goto done;
7193 
7194 	error = tog_load_refs(repo, 0);
7195 	if (error)
7196 		goto done;
7197 
7198 	if (commit_id_str == NULL) {
7199 		struct got_reference *head_ref;
7200 		error = got_ref_open(&head_ref, repo, worktree ?
7201 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7202 		if (error != NULL)
7203 			goto done;
7204 		error = got_ref_resolve(&commit_id, repo, head_ref);
7205 		got_ref_close(head_ref);
7206 	} else {
7207 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7208 		    repo, worktree);
7209 		if (error != NULL)
7210 			goto done;
7211 		if (keyword_idstr != NULL)
7212 			commit_id_str = keyword_idstr;
7213 
7214 		error = got_repo_match_object_id(&commit_id, NULL,
7215 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7216 	}
7217 	if (error != NULL)
7218 		goto done;
7219 
7220 	error = got_object_open_as_commit(&commit, repo, commit_id);
7221 	if (error)
7222 		goto done;
7223 
7224 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7225 	    commit, repo);
7226 	if (error)
7227 		goto done;
7228 
7229 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7230 	if (view == NULL) {
7231 		error = got_error_from_errno("view_open");
7232 		goto done;
7233 	}
7234 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7235 	    commit_id, repo);
7236 	if (error != NULL) {
7237 		if (view->close == NULL)
7238 			close_blame_view(view);
7239 		view_close(view);
7240 		goto done;
7241 	}
7242 
7243 	if (worktree) {
7244 		error = set_tog_base_commit(repo, worktree);
7245 		if (error != NULL)
7246 			goto done;
7247 
7248 		/* Release work tree lock. */
7249 		got_worktree_close(worktree);
7250 		worktree = NULL;
7251 	}
7252 
7253 	error = view_loop(view);
7254 
7255 done:
7256 	free(tog_base_commit.id);
7257 	free(repo_path);
7258 	free(in_repo_path);
7259 	free(link_target);
7260 	free(cwd);
7261 	free(commit_id);
7262 	free(keyword_idstr);
7263 	if (commit)
7264 		got_object_commit_close(commit);
7265 	if (worktree)
7266 		got_worktree_close(worktree);
7267 	if (repo) {
7268 		const struct got_error *close_err = got_repo_close(repo);
7269 		if (error == NULL)
7270 			error = close_err;
7271 	}
7272 	if (pack_fds) {
7273 		const struct got_error *pack_err =
7274 		    got_repo_pack_fds_close(pack_fds);
7275 		if (error == NULL)
7276 			error = pack_err;
7277 	}
7278 	tog_free_refs();
7279 	return error;
7280 }
7281 
7282 static const struct got_error *
7283 draw_tree_entries(struct tog_view *view, const char *parent_path)
7284 {
7285 	struct tog_tree_view_state *s = &view->state.tree;
7286 	const struct got_error *err = NULL;
7287 	struct got_tree_entry *te;
7288 	wchar_t *wline;
7289 	char *index = NULL;
7290 	struct tog_color *tc;
7291 	int width, n, nentries, scrollx, i = 1;
7292 	int limit = view->nlines;
7293 
7294 	s->ndisplayed = 0;
7295 	if (view_is_hsplit_top(view))
7296 		--limit;  /* border */
7297 
7298 	werase(view->window);
7299 
7300 	if (limit == 0)
7301 		return NULL;
7302 
7303 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7304 	    0, 0);
7305 	if (err)
7306 		return err;
7307 	if (view_needs_focus_indication(view))
7308 		wstandout(view->window);
7309 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7310 	if (tc)
7311 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7312 	waddwstr(view->window, wline);
7313 	free(wline);
7314 	wline = NULL;
7315 	while (width++ < view->ncols)
7316 		waddch(view->window, ' ');
7317 	if (tc)
7318 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7319 	if (view_needs_focus_indication(view))
7320 		wstandend(view->window);
7321 	if (--limit <= 0)
7322 		return NULL;
7323 
7324 	i += s->selected;
7325 	if (s->first_displayed_entry) {
7326 		i += got_tree_entry_get_index(s->first_displayed_entry);
7327 		if (s->tree != s->root)
7328 			++i;  /* account for ".." entry */
7329 	}
7330 	nentries = got_object_tree_get_nentries(s->tree);
7331 	if (asprintf(&index, "[%d/%d] %s",
7332 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7333 		return got_error_from_errno("asprintf");
7334 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7335 	free(index);
7336 	if (err)
7337 		return err;
7338 	waddwstr(view->window, wline);
7339 	free(wline);
7340 	wline = NULL;
7341 	if (width < view->ncols - 1)
7342 		waddch(view->window, '\n');
7343 	if (--limit <= 0)
7344 		return NULL;
7345 	waddch(view->window, '\n');
7346 	if (--limit <= 0)
7347 		return NULL;
7348 
7349 	if (s->first_displayed_entry == NULL) {
7350 		te = got_object_tree_get_first_entry(s->tree);
7351 		if (s->selected == 0) {
7352 			if (view->focussed)
7353 				wstandout(view->window);
7354 			s->selected_entry = NULL;
7355 		}
7356 		waddstr(view->window, "  ..\n");	/* parent directory */
7357 		if (s->selected == 0 && view->focussed)
7358 			wstandend(view->window);
7359 		s->ndisplayed++;
7360 		if (--limit <= 0)
7361 			return NULL;
7362 		n = 1;
7363 	} else {
7364 		n = 0;
7365 		te = s->first_displayed_entry;
7366 	}
7367 
7368 	view->maxx = 0;
7369 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7370 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7371 		const char *modestr = "";
7372 		mode_t mode;
7373 
7374 		te = got_object_tree_get_entry(s->tree, i);
7375 		mode = got_tree_entry_get_mode(te);
7376 
7377 		if (s->show_ids) {
7378 			err = got_object_id_str(&id_str,
7379 			    got_tree_entry_get_id(te));
7380 			if (err)
7381 				return got_error_from_errno(
7382 				    "got_object_id_str");
7383 		}
7384 		if (got_object_tree_entry_is_submodule(te))
7385 			modestr = "$";
7386 		else if (S_ISLNK(mode)) {
7387 			int i;
7388 
7389 			err = got_tree_entry_get_symlink_target(&link_target,
7390 			    te, s->repo);
7391 			if (err) {
7392 				free(id_str);
7393 				return err;
7394 			}
7395 			for (i = 0; link_target[i] != '\0'; i++) {
7396 				if (!isprint((unsigned char)link_target[i]))
7397 					link_target[i] = '?';
7398 			}
7399 			modestr = "@";
7400 		}
7401 		else if (S_ISDIR(mode))
7402 			modestr = "/";
7403 		else if (mode & S_IXUSR)
7404 			modestr = "*";
7405 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7406 		    got_tree_entry_get_name(te), modestr,
7407 		    link_target ? " -> ": "",
7408 		    link_target ? link_target : "") == -1) {
7409 			free(id_str);
7410 			free(link_target);
7411 			return got_error_from_errno("asprintf");
7412 		}
7413 		free(id_str);
7414 		free(link_target);
7415 
7416 		/* use full line width to determine view->maxx */
7417 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7418 		if (err) {
7419 			free(line);
7420 			break;
7421 		}
7422 		view->maxx = MAX(view->maxx, width);
7423 		free(wline);
7424 		wline = NULL;
7425 
7426 		err = format_line(&wline, &width, &scrollx, line, view->x,
7427 		    view->ncols, 0, 0);
7428 		if (err) {
7429 			free(line);
7430 			break;
7431 		}
7432 		if (n == s->selected) {
7433 			if (view->focussed)
7434 				wstandout(view->window);
7435 			s->selected_entry = te;
7436 		}
7437 		tc = match_color(&s->colors, line);
7438 		if (tc)
7439 			wattr_on(view->window,
7440 			    COLOR_PAIR(tc->colorpair), NULL);
7441 		waddwstr(view->window, &wline[scrollx]);
7442 		if (tc)
7443 			wattr_off(view->window,
7444 			    COLOR_PAIR(tc->colorpair), NULL);
7445 		if (width < view->ncols)
7446 			waddch(view->window, '\n');
7447 		if (n == s->selected && view->focussed)
7448 			wstandend(view->window);
7449 		free(line);
7450 		free(wline);
7451 		wline = NULL;
7452 		n++;
7453 		s->ndisplayed++;
7454 		s->last_displayed_entry = te;
7455 		if (--limit <= 0)
7456 			break;
7457 	}
7458 
7459 	return err;
7460 }
7461 
7462 static void
7463 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7464 {
7465 	struct got_tree_entry *te;
7466 	int isroot = s->tree == s->root;
7467 	int i = 0;
7468 
7469 	if (s->first_displayed_entry == NULL)
7470 		return;
7471 
7472 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7473 	while (i++ < maxscroll) {
7474 		if (te == NULL) {
7475 			if (!isroot)
7476 				s->first_displayed_entry = NULL;
7477 			break;
7478 		}
7479 		s->first_displayed_entry = te;
7480 		te = got_tree_entry_get_prev(s->tree, te);
7481 	}
7482 }
7483 
7484 static const struct got_error *
7485 tree_scroll_down(struct tog_view *view, int maxscroll)
7486 {
7487 	struct tog_tree_view_state *s = &view->state.tree;
7488 	struct got_tree_entry *next, *last;
7489 	int n = 0;
7490 
7491 	if (s->first_displayed_entry)
7492 		next = got_tree_entry_get_next(s->tree,
7493 		    s->first_displayed_entry);
7494 	else
7495 		next = got_object_tree_get_first_entry(s->tree);
7496 
7497 	last = s->last_displayed_entry;
7498 	while (next && n++ < maxscroll) {
7499 		if (last) {
7500 			s->last_displayed_entry = last;
7501 			last = got_tree_entry_get_next(s->tree, last);
7502 		}
7503 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7504 			s->first_displayed_entry = next;
7505 			next = got_tree_entry_get_next(s->tree, next);
7506 		}
7507 	}
7508 
7509 	return NULL;
7510 }
7511 
7512 static const struct got_error *
7513 tree_entry_path(char **path, struct tog_parent_trees *parents,
7514     struct got_tree_entry *te)
7515 {
7516 	const struct got_error *err = NULL;
7517 	struct tog_parent_tree *pt;
7518 	size_t len = 2; /* for leading slash and NUL */
7519 
7520 	TAILQ_FOREACH(pt, parents, entry)
7521 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7522 		    + 1 /* slash */;
7523 	if (te)
7524 		len += strlen(got_tree_entry_get_name(te));
7525 
7526 	*path = calloc(1, len);
7527 	if (path == NULL)
7528 		return got_error_from_errno("calloc");
7529 
7530 	(*path)[0] = '/';
7531 	pt = TAILQ_LAST(parents, tog_parent_trees);
7532 	while (pt) {
7533 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7534 		if (strlcat(*path, name, len) >= len) {
7535 			err = got_error(GOT_ERR_NO_SPACE);
7536 			goto done;
7537 		}
7538 		if (strlcat(*path, "/", len) >= len) {
7539 			err = got_error(GOT_ERR_NO_SPACE);
7540 			goto done;
7541 		}
7542 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7543 	}
7544 	if (te) {
7545 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7546 			err = got_error(GOT_ERR_NO_SPACE);
7547 			goto done;
7548 		}
7549 	}
7550 done:
7551 	if (err) {
7552 		free(*path);
7553 		*path = NULL;
7554 	}
7555 	return err;
7556 }
7557 
7558 static const struct got_error *
7559 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7560     struct got_tree_entry *te, struct tog_parent_trees *parents,
7561     struct got_object_id *commit_id, struct got_repository *repo)
7562 {
7563 	const struct got_error *err = NULL;
7564 	char *path;
7565 	struct tog_view *blame_view;
7566 
7567 	*new_view = NULL;
7568 
7569 	err = tree_entry_path(&path, parents, te);
7570 	if (err)
7571 		return err;
7572 
7573 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7574 	if (blame_view == NULL) {
7575 		err = got_error_from_errno("view_open");
7576 		goto done;
7577 	}
7578 
7579 	err = open_blame_view(blame_view, path, commit_id, repo);
7580 	if (err) {
7581 		if (err->code == GOT_ERR_CANCELLED)
7582 			err = NULL;
7583 		view_close(blame_view);
7584 	} else
7585 		*new_view = blame_view;
7586 done:
7587 	free(path);
7588 	return err;
7589 }
7590 
7591 static const struct got_error *
7592 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7593     struct tog_tree_view_state *s)
7594 {
7595 	struct tog_view *log_view;
7596 	const struct got_error *err = NULL;
7597 	char *path;
7598 
7599 	*new_view = NULL;
7600 
7601 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7602 	if (log_view == NULL)
7603 		return got_error_from_errno("view_open");
7604 
7605 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7606 	if (err)
7607 		return err;
7608 
7609 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7610 	    path, 0);
7611 	if (err)
7612 		view_close(log_view);
7613 	else
7614 		*new_view = log_view;
7615 	free(path);
7616 	return err;
7617 }
7618 
7619 static const struct got_error *
7620 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7621     const char *head_ref_name, struct got_repository *repo)
7622 {
7623 	const struct got_error *err = NULL;
7624 	char *commit_id_str = NULL;
7625 	struct tog_tree_view_state *s = &view->state.tree;
7626 	struct got_commit_object *commit = NULL;
7627 
7628 	TAILQ_INIT(&s->parents);
7629 	STAILQ_INIT(&s->colors);
7630 
7631 	s->commit_id = got_object_id_dup(commit_id);
7632 	if (s->commit_id == NULL) {
7633 		err = got_error_from_errno("got_object_id_dup");
7634 		goto done;
7635 	}
7636 
7637 	err = got_object_open_as_commit(&commit, repo, commit_id);
7638 	if (err)
7639 		goto done;
7640 
7641 	/*
7642 	 * The root is opened here and will be closed when the view is closed.
7643 	 * Any visited subtrees and their path-wise parents are opened and
7644 	 * closed on demand.
7645 	 */
7646 	err = got_object_open_as_tree(&s->root, repo,
7647 	    got_object_commit_get_tree_id(commit));
7648 	if (err)
7649 		goto done;
7650 	s->tree = s->root;
7651 
7652 	err = got_object_id_str(&commit_id_str, commit_id);
7653 	if (err != NULL)
7654 		goto done;
7655 
7656 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7657 		err = got_error_from_errno("asprintf");
7658 		goto done;
7659 	}
7660 
7661 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7662 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7663 	if (head_ref_name) {
7664 		s->head_ref_name = strdup(head_ref_name);
7665 		if (s->head_ref_name == NULL) {
7666 			err = got_error_from_errno("strdup");
7667 			goto done;
7668 		}
7669 	}
7670 	s->repo = repo;
7671 
7672 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7673 		err = add_color(&s->colors, "\\$$",
7674 		    TOG_COLOR_TREE_SUBMODULE,
7675 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7676 		if (err)
7677 			goto done;
7678 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7679 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7680 		if (err)
7681 			goto done;
7682 		err = add_color(&s->colors, "/$",
7683 		    TOG_COLOR_TREE_DIRECTORY,
7684 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7685 		if (err)
7686 			goto done;
7687 
7688 		err = add_color(&s->colors, "\\*$",
7689 		    TOG_COLOR_TREE_EXECUTABLE,
7690 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7691 		if (err)
7692 			goto done;
7693 
7694 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7695 		    get_color_value("TOG_COLOR_COMMIT"));
7696 		if (err)
7697 			goto done;
7698 	}
7699 
7700 	view->show = show_tree_view;
7701 	view->input = input_tree_view;
7702 	view->close = close_tree_view;
7703 	view->search_start = search_start_tree_view;
7704 	view->search_next = search_next_tree_view;
7705 done:
7706 	free(commit_id_str);
7707 	if (commit)
7708 		got_object_commit_close(commit);
7709 	if (err) {
7710 		if (view->close == NULL)
7711 			close_tree_view(view);
7712 		view_close(view);
7713 	}
7714 	return err;
7715 }
7716 
7717 static const struct got_error *
7718 close_tree_view(struct tog_view *view)
7719 {
7720 	struct tog_tree_view_state *s = &view->state.tree;
7721 
7722 	free_colors(&s->colors);
7723 	free(s->tree_label);
7724 	s->tree_label = NULL;
7725 	free(s->commit_id);
7726 	s->commit_id = NULL;
7727 	free(s->head_ref_name);
7728 	s->head_ref_name = NULL;
7729 	while (!TAILQ_EMPTY(&s->parents)) {
7730 		struct tog_parent_tree *parent;
7731 		parent = TAILQ_FIRST(&s->parents);
7732 		TAILQ_REMOVE(&s->parents, parent, entry);
7733 		if (parent->tree != s->root)
7734 			got_object_tree_close(parent->tree);
7735 		free(parent);
7736 
7737 	}
7738 	if (s->tree != NULL && s->tree != s->root)
7739 		got_object_tree_close(s->tree);
7740 	if (s->root)
7741 		got_object_tree_close(s->root);
7742 	return NULL;
7743 }
7744 
7745 static const struct got_error *
7746 search_start_tree_view(struct tog_view *view)
7747 {
7748 	struct tog_tree_view_state *s = &view->state.tree;
7749 
7750 	s->matched_entry = NULL;
7751 	return NULL;
7752 }
7753 
7754 static int
7755 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7756 {
7757 	regmatch_t regmatch;
7758 
7759 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7760 	    0) == 0;
7761 }
7762 
7763 static const struct got_error *
7764 search_next_tree_view(struct tog_view *view)
7765 {
7766 	struct tog_tree_view_state *s = &view->state.tree;
7767 	struct got_tree_entry *te = NULL;
7768 
7769 	if (!view->searching) {
7770 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7771 		return NULL;
7772 	}
7773 
7774 	if (s->matched_entry) {
7775 		if (view->searching == TOG_SEARCH_FORWARD) {
7776 			if (s->selected_entry)
7777 				te = got_tree_entry_get_next(s->tree,
7778 				    s->selected_entry);
7779 			else
7780 				te = got_object_tree_get_first_entry(s->tree);
7781 		} else {
7782 			if (s->selected_entry == NULL)
7783 				te = got_object_tree_get_last_entry(s->tree);
7784 			else
7785 				te = got_tree_entry_get_prev(s->tree,
7786 				    s->selected_entry);
7787 		}
7788 	} else {
7789 		if (s->selected_entry)
7790 			te = s->selected_entry;
7791 		else if (view->searching == TOG_SEARCH_FORWARD)
7792 			te = got_object_tree_get_first_entry(s->tree);
7793 		else
7794 			te = got_object_tree_get_last_entry(s->tree);
7795 	}
7796 
7797 	while (1) {
7798 		if (te == NULL) {
7799 			if (s->matched_entry == NULL) {
7800 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7801 				return NULL;
7802 			}
7803 			if (view->searching == TOG_SEARCH_FORWARD)
7804 				te = got_object_tree_get_first_entry(s->tree);
7805 			else
7806 				te = got_object_tree_get_last_entry(s->tree);
7807 		}
7808 
7809 		if (match_tree_entry(te, &view->regex)) {
7810 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7811 			s->matched_entry = te;
7812 			break;
7813 		}
7814 
7815 		if (view->searching == TOG_SEARCH_FORWARD)
7816 			te = got_tree_entry_get_next(s->tree, te);
7817 		else
7818 			te = got_tree_entry_get_prev(s->tree, te);
7819 	}
7820 
7821 	if (s->matched_entry) {
7822 		s->first_displayed_entry = s->matched_entry;
7823 		s->selected = 0;
7824 	}
7825 
7826 	return NULL;
7827 }
7828 
7829 static const struct got_error *
7830 show_tree_view(struct tog_view *view)
7831 {
7832 	const struct got_error *err = NULL;
7833 	struct tog_tree_view_state *s = &view->state.tree;
7834 	char *parent_path;
7835 
7836 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7837 	if (err)
7838 		return err;
7839 
7840 	err = draw_tree_entries(view, parent_path);
7841 	free(parent_path);
7842 
7843 	view_border(view);
7844 	return err;
7845 }
7846 
7847 static const struct got_error *
7848 tree_goto_line(struct tog_view *view, int nlines)
7849 {
7850 	const struct got_error		 *err = NULL;
7851 	struct tog_tree_view_state	 *s = &view->state.tree;
7852 	struct got_tree_entry		**fte, **lte, **ste;
7853 	int				  g, last, first = 1, i = 1;
7854 	int				  root = s->tree == s->root;
7855 	int				  off = root ? 1 : 2;
7856 
7857 	g = view->gline;
7858 	view->gline = 0;
7859 
7860 	if (g == 0)
7861 		g = 1;
7862 	else if (g > got_object_tree_get_nentries(s->tree))
7863 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7864 
7865 	fte = &s->first_displayed_entry;
7866 	lte = &s->last_displayed_entry;
7867 	ste = &s->selected_entry;
7868 
7869 	if (*fte != NULL) {
7870 		first = got_tree_entry_get_index(*fte);
7871 		first += off;  /* account for ".." */
7872 	}
7873 	last = got_tree_entry_get_index(*lte);
7874 	last += off;
7875 
7876 	if (g >= first && g <= last && g - first < nlines) {
7877 		s->selected = g - first;
7878 		return NULL;	/* gline is on the current page */
7879 	}
7880 
7881 	if (*ste != NULL) {
7882 		i = got_tree_entry_get_index(*ste);
7883 		i += off;
7884 	}
7885 
7886 	if (i < g) {
7887 		err = tree_scroll_down(view, g - i);
7888 		if (err)
7889 			return err;
7890 		if (got_tree_entry_get_index(*lte) >=
7891 		    got_object_tree_get_nentries(s->tree) - 1 &&
7892 		    first + s->selected < g &&
7893 		    s->selected < s->ndisplayed - 1) {
7894 			first = got_tree_entry_get_index(*fte);
7895 			first += off;
7896 			s->selected = g - first;
7897 		}
7898 	} else if (i > g)
7899 		tree_scroll_up(s, i - g);
7900 
7901 	if (g < nlines &&
7902 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7903 		s->selected = g - 1;
7904 
7905 	return NULL;
7906 }
7907 
7908 static const struct got_error *
7909 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7910 {
7911 	const struct got_error *err = NULL;
7912 	struct tog_tree_view_state *s = &view->state.tree;
7913 	struct got_tree_entry *te;
7914 	int n, nscroll = view->nlines - 3;
7915 
7916 	if (view->gline)
7917 		return tree_goto_line(view, nscroll);
7918 
7919 	switch (ch) {
7920 	case '0':
7921 	case '$':
7922 	case KEY_RIGHT:
7923 	case 'l':
7924 	case KEY_LEFT:
7925 	case 'h':
7926 		horizontal_scroll_input(view, ch);
7927 		break;
7928 	case 'i':
7929 		s->show_ids = !s->show_ids;
7930 		view->count = 0;
7931 		break;
7932 	case 'L':
7933 		view->count = 0;
7934 		if (!s->selected_entry)
7935 			break;
7936 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7937 		break;
7938 	case 'R':
7939 		view->count = 0;
7940 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7941 		break;
7942 	case 'g':
7943 	case '=':
7944 	case KEY_HOME:
7945 		s->selected = 0;
7946 		view->count = 0;
7947 		if (s->tree == s->root)
7948 			s->first_displayed_entry =
7949 			    got_object_tree_get_first_entry(s->tree);
7950 		else
7951 			s->first_displayed_entry = NULL;
7952 		break;
7953 	case 'G':
7954 	case '*':
7955 	case KEY_END: {
7956 		int eos = view->nlines - 3;
7957 
7958 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7959 			--eos;  /* border */
7960 		s->selected = 0;
7961 		view->count = 0;
7962 		te = got_object_tree_get_last_entry(s->tree);
7963 		for (n = 0; n < eos; n++) {
7964 			if (te == NULL) {
7965 				if (s->tree != s->root) {
7966 					s->first_displayed_entry = NULL;
7967 					n++;
7968 				}
7969 				break;
7970 			}
7971 			s->first_displayed_entry = te;
7972 			te = got_tree_entry_get_prev(s->tree, te);
7973 		}
7974 		if (n > 0)
7975 			s->selected = n - 1;
7976 		break;
7977 	}
7978 	case 'k':
7979 	case KEY_UP:
7980 	case CTRL('p'):
7981 		if (s->selected > 0) {
7982 			s->selected--;
7983 			break;
7984 		}
7985 		tree_scroll_up(s, 1);
7986 		if (s->selected_entry == NULL ||
7987 		    (s->tree == s->root && s->selected_entry ==
7988 		     got_object_tree_get_first_entry(s->tree)))
7989 			view->count = 0;
7990 		break;
7991 	case CTRL('u'):
7992 	case 'u':
7993 		nscroll /= 2;
7994 		/* FALL THROUGH */
7995 	case KEY_PPAGE:
7996 	case CTRL('b'):
7997 	case 'b':
7998 		if (s->tree == s->root) {
7999 			if (got_object_tree_get_first_entry(s->tree) ==
8000 			    s->first_displayed_entry)
8001 				s->selected -= MIN(s->selected, nscroll);
8002 		} else {
8003 			if (s->first_displayed_entry == NULL)
8004 				s->selected -= MIN(s->selected, nscroll);
8005 		}
8006 		tree_scroll_up(s, MAX(0, nscroll));
8007 		if (s->selected_entry == NULL ||
8008 		    (s->tree == s->root && s->selected_entry ==
8009 		     got_object_tree_get_first_entry(s->tree)))
8010 			view->count = 0;
8011 		break;
8012 	case 'j':
8013 	case KEY_DOWN:
8014 	case CTRL('n'):
8015 		if (s->selected < s->ndisplayed - 1) {
8016 			s->selected++;
8017 			break;
8018 		}
8019 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8020 		    == NULL) {
8021 			/* can't scroll any further */
8022 			view->count = 0;
8023 			break;
8024 		}
8025 		tree_scroll_down(view, 1);
8026 		break;
8027 	case CTRL('d'):
8028 	case 'd':
8029 		nscroll /= 2;
8030 		/* FALL THROUGH */
8031 	case KEY_NPAGE:
8032 	case CTRL('f'):
8033 	case 'f':
8034 	case ' ':
8035 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8036 		    == NULL) {
8037 			/* can't scroll any further; move cursor down */
8038 			if (s->selected < s->ndisplayed - 1)
8039 				s->selected += MIN(nscroll,
8040 				    s->ndisplayed - s->selected - 1);
8041 			else
8042 				view->count = 0;
8043 			break;
8044 		}
8045 		tree_scroll_down(view, nscroll);
8046 		break;
8047 	case KEY_ENTER:
8048 	case '\r':
8049 	case KEY_BACKSPACE:
8050 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8051 			struct tog_parent_tree *parent;
8052 			/* user selected '..' */
8053 			if (s->tree == s->root) {
8054 				view->count = 0;
8055 				break;
8056 			}
8057 			parent = TAILQ_FIRST(&s->parents);
8058 			TAILQ_REMOVE(&s->parents, parent,
8059 			    entry);
8060 			got_object_tree_close(s->tree);
8061 			s->tree = parent->tree;
8062 			s->first_displayed_entry =
8063 			    parent->first_displayed_entry;
8064 			s->selected_entry =
8065 			    parent->selected_entry;
8066 			s->selected = parent->selected;
8067 			if (s->selected > view->nlines - 3) {
8068 				err = offset_selection_down(view);
8069 				if (err)
8070 					break;
8071 			}
8072 			free(parent);
8073 		} else if (S_ISDIR(got_tree_entry_get_mode(
8074 		    s->selected_entry))) {
8075 			struct got_tree_object *subtree;
8076 			view->count = 0;
8077 			err = got_object_open_as_tree(&subtree, s->repo,
8078 			    got_tree_entry_get_id(s->selected_entry));
8079 			if (err)
8080 				break;
8081 			err = tree_view_visit_subtree(s, subtree);
8082 			if (err) {
8083 				got_object_tree_close(subtree);
8084 				break;
8085 			}
8086 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8087 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8088 		break;
8089 	case KEY_RESIZE:
8090 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8091 			s->selected = view->nlines - 4;
8092 		view->count = 0;
8093 		break;
8094 	default:
8095 		view->count = 0;
8096 		break;
8097 	}
8098 
8099 	return err;
8100 }
8101 
8102 __dead static void
8103 usage_tree(void)
8104 {
8105 	endwin();
8106 	fprintf(stderr,
8107 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8108 	    getprogname());
8109 	exit(1);
8110 }
8111 
8112 static const struct got_error *
8113 cmd_tree(int argc, char *argv[])
8114 {
8115 	const struct got_error *error;
8116 	struct got_repository *repo = NULL;
8117 	struct got_worktree *worktree = NULL;
8118 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8119 	struct got_object_id *commit_id = NULL;
8120 	struct got_commit_object *commit = NULL;
8121 	const char *commit_id_arg = NULL;
8122 	char *keyword_idstr = NULL, *label = NULL;
8123 	struct got_reference *ref = NULL;
8124 	const char *head_ref_name = NULL;
8125 	int ch;
8126 	struct tog_view *view;
8127 	int *pack_fds = NULL;
8128 
8129 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8130 		switch (ch) {
8131 		case 'c':
8132 			commit_id_arg = optarg;
8133 			break;
8134 		case 'r':
8135 			repo_path = realpath(optarg, NULL);
8136 			if (repo_path == NULL)
8137 				return got_error_from_errno2("realpath",
8138 				    optarg);
8139 			break;
8140 		default:
8141 			usage_tree();
8142 			/* NOTREACHED */
8143 		}
8144 	}
8145 
8146 	argc -= optind;
8147 	argv += optind;
8148 
8149 	if (argc > 1)
8150 		usage_tree();
8151 
8152 	error = got_repo_pack_fds_open(&pack_fds);
8153 	if (error != NULL)
8154 		goto done;
8155 
8156 	if (repo_path == NULL) {
8157 		cwd = getcwd(NULL, 0);
8158 		if (cwd == NULL)
8159 			return got_error_from_errno("getcwd");
8160 		error = got_worktree_open(&worktree, cwd, NULL);
8161 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8162 			goto done;
8163 		if (worktree)
8164 			repo_path =
8165 			    strdup(got_worktree_get_repo_path(worktree));
8166 		else
8167 			repo_path = strdup(cwd);
8168 		if (repo_path == NULL) {
8169 			error = got_error_from_errno("strdup");
8170 			goto done;
8171 		}
8172 	}
8173 
8174 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8175 	if (error != NULL)
8176 		goto done;
8177 
8178 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8179 	    repo, worktree);
8180 	if (error)
8181 		goto done;
8182 
8183 	init_curses();
8184 
8185 	error = apply_unveil(got_repo_get_path(repo), NULL);
8186 	if (error)
8187 		goto done;
8188 
8189 	error = tog_load_refs(repo, 0);
8190 	if (error)
8191 		goto done;
8192 
8193 	if (commit_id_arg == NULL) {
8194 		error = got_repo_match_object_id(&commit_id, &label,
8195 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8196 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8197 		if (error)
8198 			goto done;
8199 		head_ref_name = label;
8200 	} else {
8201 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8202 		    repo, worktree);
8203 		if (error != NULL)
8204 			goto done;
8205 		if (keyword_idstr != NULL)
8206 			commit_id_arg = keyword_idstr;
8207 
8208 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8209 		if (error == NULL)
8210 			head_ref_name = got_ref_get_name(ref);
8211 		else if (error->code != GOT_ERR_NOT_REF)
8212 			goto done;
8213 		error = got_repo_match_object_id(&commit_id, NULL,
8214 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8215 		if (error)
8216 			goto done;
8217 	}
8218 
8219 	error = got_object_open_as_commit(&commit, repo, commit_id);
8220 	if (error)
8221 		goto done;
8222 
8223 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8224 	if (view == NULL) {
8225 		error = got_error_from_errno("view_open");
8226 		goto done;
8227 	}
8228 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8229 	if (error)
8230 		goto done;
8231 	if (!got_path_is_root_dir(in_repo_path)) {
8232 		error = tree_view_walk_path(&view->state.tree, commit,
8233 		    in_repo_path);
8234 		if (error)
8235 			goto done;
8236 	}
8237 
8238 	if (worktree) {
8239 		error = set_tog_base_commit(repo, worktree);
8240 		if (error != NULL)
8241 			goto done;
8242 
8243 		/* Release work tree lock. */
8244 		got_worktree_close(worktree);
8245 		worktree = NULL;
8246 	}
8247 
8248 	error = view_loop(view);
8249 
8250 done:
8251 	free(tog_base_commit.id);
8252 	free(keyword_idstr);
8253 	free(repo_path);
8254 	free(cwd);
8255 	free(commit_id);
8256 	free(label);
8257 	if (ref)
8258 		got_ref_close(ref);
8259 	if (worktree != NULL)
8260 		got_worktree_close(worktree);
8261 	if (repo) {
8262 		const struct got_error *close_err = got_repo_close(repo);
8263 		if (error == NULL)
8264 			error = close_err;
8265 	}
8266 	if (pack_fds) {
8267 		const struct got_error *pack_err =
8268 		    got_repo_pack_fds_close(pack_fds);
8269 		if (error == NULL)
8270 			error = pack_err;
8271 	}
8272 	tog_free_refs();
8273 	return error;
8274 }
8275 
8276 static const struct got_error *
8277 ref_view_load_refs(struct tog_ref_view_state *s)
8278 {
8279 	struct got_reflist_entry *sre;
8280 	struct tog_reflist_entry *re;
8281 
8282 	s->nrefs = 0;
8283 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8284 		if (strncmp(got_ref_get_name(sre->ref),
8285 		    "refs/got/", 9) == 0 &&
8286 		    strncmp(got_ref_get_name(sre->ref),
8287 		    "refs/got/backup/", 16) != 0)
8288 			continue;
8289 
8290 		re = malloc(sizeof(*re));
8291 		if (re == NULL)
8292 			return got_error_from_errno("malloc");
8293 
8294 		re->ref = got_ref_dup(sre->ref);
8295 		if (re->ref == NULL)
8296 			return got_error_from_errno("got_ref_dup");
8297 		re->idx = s->nrefs++;
8298 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8299 	}
8300 
8301 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8302 	return NULL;
8303 }
8304 
8305 static void
8306 ref_view_free_refs(struct tog_ref_view_state *s)
8307 {
8308 	struct tog_reflist_entry *re;
8309 
8310 	while (!TAILQ_EMPTY(&s->refs)) {
8311 		re = TAILQ_FIRST(&s->refs);
8312 		TAILQ_REMOVE(&s->refs, re, entry);
8313 		got_ref_close(re->ref);
8314 		free(re);
8315 	}
8316 }
8317 
8318 static const struct got_error *
8319 open_ref_view(struct tog_view *view, struct got_repository *repo)
8320 {
8321 	const struct got_error *err = NULL;
8322 	struct tog_ref_view_state *s = &view->state.ref;
8323 
8324 	s->selected_entry = 0;
8325 	s->repo = repo;
8326 
8327 	TAILQ_INIT(&s->refs);
8328 	STAILQ_INIT(&s->colors);
8329 
8330 	err = ref_view_load_refs(s);
8331 	if (err)
8332 		goto done;
8333 
8334 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8335 		err = add_color(&s->colors, "^refs/heads/",
8336 		    TOG_COLOR_REFS_HEADS,
8337 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8338 		if (err)
8339 			goto done;
8340 
8341 		err = add_color(&s->colors, "^refs/tags/",
8342 		    TOG_COLOR_REFS_TAGS,
8343 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8344 		if (err)
8345 			goto done;
8346 
8347 		err = add_color(&s->colors, "^refs/remotes/",
8348 		    TOG_COLOR_REFS_REMOTES,
8349 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8350 		if (err)
8351 			goto done;
8352 
8353 		err = add_color(&s->colors, "^refs/got/backup/",
8354 		    TOG_COLOR_REFS_BACKUP,
8355 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8356 		if (err)
8357 			goto done;
8358 	}
8359 
8360 	view->show = show_ref_view;
8361 	view->input = input_ref_view;
8362 	view->close = close_ref_view;
8363 	view->search_start = search_start_ref_view;
8364 	view->search_next = search_next_ref_view;
8365 done:
8366 	if (err) {
8367 		if (view->close == NULL)
8368 			close_ref_view(view);
8369 		view_close(view);
8370 	}
8371 	return err;
8372 }
8373 
8374 static const struct got_error *
8375 close_ref_view(struct tog_view *view)
8376 {
8377 	struct tog_ref_view_state *s = &view->state.ref;
8378 
8379 	ref_view_free_refs(s);
8380 	free_colors(&s->colors);
8381 
8382 	return NULL;
8383 }
8384 
8385 static const struct got_error *
8386 resolve_reflist_entry(struct got_object_id **commit_id,
8387     struct tog_reflist_entry *re, struct got_repository *repo)
8388 {
8389 	const struct got_error *err = NULL;
8390 	struct got_object_id *obj_id;
8391 	struct got_tag_object *tag = NULL;
8392 	int obj_type;
8393 
8394 	*commit_id = NULL;
8395 
8396 	err = got_ref_resolve(&obj_id, repo, re->ref);
8397 	if (err)
8398 		return err;
8399 
8400 	err = got_object_get_type(&obj_type, repo, obj_id);
8401 	if (err)
8402 		goto done;
8403 
8404 	switch (obj_type) {
8405 	case GOT_OBJ_TYPE_COMMIT:
8406 		*commit_id = obj_id;
8407 		break;
8408 	case GOT_OBJ_TYPE_TAG:
8409 		err = got_object_open_as_tag(&tag, repo, obj_id);
8410 		if (err)
8411 			goto done;
8412 		free(obj_id);
8413 		err = got_object_get_type(&obj_type, repo,
8414 		    got_object_tag_get_object_id(tag));
8415 		if (err)
8416 			goto done;
8417 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8418 			err = got_error(GOT_ERR_OBJ_TYPE);
8419 			goto done;
8420 		}
8421 		*commit_id = got_object_id_dup(
8422 		    got_object_tag_get_object_id(tag));
8423 		if (*commit_id == NULL) {
8424 			err = got_error_from_errno("got_object_id_dup");
8425 			goto done;
8426 		}
8427 		break;
8428 	default:
8429 		err = got_error(GOT_ERR_OBJ_TYPE);
8430 		break;
8431 	}
8432 
8433 done:
8434 	if (tag)
8435 		got_object_tag_close(tag);
8436 	if (err) {
8437 		free(*commit_id);
8438 		*commit_id = NULL;
8439 	}
8440 	return err;
8441 }
8442 
8443 static const struct got_error *
8444 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8445     struct tog_reflist_entry *re, struct got_repository *repo)
8446 {
8447 	struct tog_view *log_view;
8448 	const struct got_error *err = NULL;
8449 	struct got_object_id *commit_id = NULL;
8450 
8451 	*new_view = NULL;
8452 
8453 	err = resolve_reflist_entry(&commit_id, re, repo);
8454 	if (err) {
8455 		if (err->code != GOT_ERR_OBJ_TYPE)
8456 			return err;
8457 		else
8458 			return NULL;
8459 	}
8460 
8461 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8462 	if (log_view == NULL) {
8463 		err = got_error_from_errno("view_open");
8464 		goto done;
8465 	}
8466 
8467 	err = open_log_view(log_view, commit_id, repo,
8468 	    got_ref_get_name(re->ref), "", 0);
8469 done:
8470 	if (err)
8471 		view_close(log_view);
8472 	else
8473 		*new_view = log_view;
8474 	free(commit_id);
8475 	return err;
8476 }
8477 
8478 static void
8479 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8480 {
8481 	struct tog_reflist_entry *re;
8482 	int i = 0;
8483 
8484 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8485 		return;
8486 
8487 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8488 	while (i++ < maxscroll) {
8489 		if (re == NULL)
8490 			break;
8491 		s->first_displayed_entry = re;
8492 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8493 	}
8494 }
8495 
8496 static const struct got_error *
8497 ref_scroll_down(struct tog_view *view, int maxscroll)
8498 {
8499 	struct tog_ref_view_state *s = &view->state.ref;
8500 	struct tog_reflist_entry *next, *last;
8501 	int n = 0;
8502 
8503 	if (s->first_displayed_entry)
8504 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8505 	else
8506 		next = TAILQ_FIRST(&s->refs);
8507 
8508 	last = s->last_displayed_entry;
8509 	while (next && n++ < maxscroll) {
8510 		if (last) {
8511 			s->last_displayed_entry = last;
8512 			last = TAILQ_NEXT(last, entry);
8513 		}
8514 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8515 			s->first_displayed_entry = next;
8516 			next = TAILQ_NEXT(next, entry);
8517 		}
8518 	}
8519 
8520 	return NULL;
8521 }
8522 
8523 static const struct got_error *
8524 search_start_ref_view(struct tog_view *view)
8525 {
8526 	struct tog_ref_view_state *s = &view->state.ref;
8527 
8528 	s->matched_entry = NULL;
8529 	return NULL;
8530 }
8531 
8532 static int
8533 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8534 {
8535 	regmatch_t regmatch;
8536 
8537 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8538 	    0) == 0;
8539 }
8540 
8541 static const struct got_error *
8542 search_next_ref_view(struct tog_view *view)
8543 {
8544 	struct tog_ref_view_state *s = &view->state.ref;
8545 	struct tog_reflist_entry *re = NULL;
8546 
8547 	if (!view->searching) {
8548 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8549 		return NULL;
8550 	}
8551 
8552 	if (s->matched_entry) {
8553 		if (view->searching == TOG_SEARCH_FORWARD) {
8554 			if (s->selected_entry)
8555 				re = TAILQ_NEXT(s->selected_entry, entry);
8556 			else
8557 				re = TAILQ_PREV(s->selected_entry,
8558 				    tog_reflist_head, entry);
8559 		} else {
8560 			if (s->selected_entry == NULL)
8561 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8562 			else
8563 				re = TAILQ_PREV(s->selected_entry,
8564 				    tog_reflist_head, entry);
8565 		}
8566 	} else {
8567 		if (s->selected_entry)
8568 			re = s->selected_entry;
8569 		else if (view->searching == TOG_SEARCH_FORWARD)
8570 			re = TAILQ_FIRST(&s->refs);
8571 		else
8572 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8573 	}
8574 
8575 	while (1) {
8576 		if (re == NULL) {
8577 			if (s->matched_entry == NULL) {
8578 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8579 				return NULL;
8580 			}
8581 			if (view->searching == TOG_SEARCH_FORWARD)
8582 				re = TAILQ_FIRST(&s->refs);
8583 			else
8584 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8585 		}
8586 
8587 		if (match_reflist_entry(re, &view->regex)) {
8588 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8589 			s->matched_entry = re;
8590 			break;
8591 		}
8592 
8593 		if (view->searching == TOG_SEARCH_FORWARD)
8594 			re = TAILQ_NEXT(re, entry);
8595 		else
8596 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8597 	}
8598 
8599 	if (s->matched_entry) {
8600 		s->first_displayed_entry = s->matched_entry;
8601 		s->selected = 0;
8602 	}
8603 
8604 	return NULL;
8605 }
8606 
8607 static const struct got_error *
8608 show_ref_view(struct tog_view *view)
8609 {
8610 	const struct got_error *err = NULL;
8611 	struct tog_ref_view_state *s = &view->state.ref;
8612 	struct tog_reflist_entry *re;
8613 	char *line = NULL;
8614 	wchar_t *wline;
8615 	struct tog_color *tc;
8616 	int width, n, scrollx;
8617 	int limit = view->nlines;
8618 
8619 	werase(view->window);
8620 
8621 	s->ndisplayed = 0;
8622 	if (view_is_hsplit_top(view))
8623 		--limit;  /* border */
8624 
8625 	if (limit == 0)
8626 		return NULL;
8627 
8628 	re = s->first_displayed_entry;
8629 
8630 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8631 	    s->nrefs) == -1)
8632 		return got_error_from_errno("asprintf");
8633 
8634 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8635 	if (err) {
8636 		free(line);
8637 		return err;
8638 	}
8639 	if (view_needs_focus_indication(view))
8640 		wstandout(view->window);
8641 	waddwstr(view->window, wline);
8642 	while (width++ < view->ncols)
8643 		waddch(view->window, ' ');
8644 	if (view_needs_focus_indication(view))
8645 		wstandend(view->window);
8646 	free(wline);
8647 	wline = NULL;
8648 	free(line);
8649 	line = NULL;
8650 	if (--limit <= 0)
8651 		return NULL;
8652 
8653 	n = 0;
8654 	view->maxx = 0;
8655 	while (re && limit > 0) {
8656 		char *line = NULL;
8657 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8658 
8659 		if (s->show_date) {
8660 			struct got_commit_object *ci;
8661 			struct got_tag_object *tag;
8662 			struct got_object_id *id;
8663 			struct tm tm;
8664 			time_t t;
8665 
8666 			err = got_ref_resolve(&id, s->repo, re->ref);
8667 			if (err)
8668 				return err;
8669 			err = got_object_open_as_tag(&tag, s->repo, id);
8670 			if (err) {
8671 				if (err->code != GOT_ERR_OBJ_TYPE) {
8672 					free(id);
8673 					return err;
8674 				}
8675 				err = got_object_open_as_commit(&ci, s->repo,
8676 				    id);
8677 				if (err) {
8678 					free(id);
8679 					return err;
8680 				}
8681 				t = got_object_commit_get_committer_time(ci);
8682 				got_object_commit_close(ci);
8683 			} else {
8684 				t = got_object_tag_get_tagger_time(tag);
8685 				got_object_tag_close(tag);
8686 			}
8687 			free(id);
8688 			if (gmtime_r(&t, &tm) == NULL)
8689 				return got_error_from_errno("gmtime_r");
8690 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8691 				return got_error(GOT_ERR_NO_SPACE);
8692 		}
8693 		if (got_ref_is_symbolic(re->ref)) {
8694 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8695 			    ymd : "", got_ref_get_name(re->ref),
8696 			    got_ref_get_symref_target(re->ref)) == -1)
8697 				return got_error_from_errno("asprintf");
8698 		} else if (s->show_ids) {
8699 			struct got_object_id *id;
8700 			char *id_str;
8701 			err = got_ref_resolve(&id, s->repo, re->ref);
8702 			if (err)
8703 				return err;
8704 			err = got_object_id_str(&id_str, id);
8705 			if (err) {
8706 				free(id);
8707 				return err;
8708 			}
8709 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8710 			    got_ref_get_name(re->ref), id_str) == -1) {
8711 				err = got_error_from_errno("asprintf");
8712 				free(id);
8713 				free(id_str);
8714 				return err;
8715 			}
8716 			free(id);
8717 			free(id_str);
8718 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8719 		    got_ref_get_name(re->ref)) == -1)
8720 			return got_error_from_errno("asprintf");
8721 
8722 		/* use full line width to determine view->maxx */
8723 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8724 		if (err) {
8725 			free(line);
8726 			return err;
8727 		}
8728 		view->maxx = MAX(view->maxx, width);
8729 		free(wline);
8730 		wline = NULL;
8731 
8732 		err = format_line(&wline, &width, &scrollx, line, view->x,
8733 		    view->ncols, 0, 0);
8734 		if (err) {
8735 			free(line);
8736 			return err;
8737 		}
8738 		if (n == s->selected) {
8739 			if (view->focussed)
8740 				wstandout(view->window);
8741 			s->selected_entry = re;
8742 		}
8743 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8744 		if (tc)
8745 			wattr_on(view->window,
8746 			    COLOR_PAIR(tc->colorpair), NULL);
8747 		waddwstr(view->window, &wline[scrollx]);
8748 		if (tc)
8749 			wattr_off(view->window,
8750 			    COLOR_PAIR(tc->colorpair), NULL);
8751 		if (width < view->ncols)
8752 			waddch(view->window, '\n');
8753 		if (n == s->selected && view->focussed)
8754 			wstandend(view->window);
8755 		free(line);
8756 		free(wline);
8757 		wline = NULL;
8758 		n++;
8759 		s->ndisplayed++;
8760 		s->last_displayed_entry = re;
8761 
8762 		limit--;
8763 		re = TAILQ_NEXT(re, entry);
8764 	}
8765 
8766 	view_border(view);
8767 	return err;
8768 }
8769 
8770 static const struct got_error *
8771 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8772     struct tog_reflist_entry *re, struct got_repository *repo)
8773 {
8774 	const struct got_error *err = NULL;
8775 	struct got_object_id *commit_id = NULL;
8776 	struct tog_view *tree_view;
8777 
8778 	*new_view = NULL;
8779 
8780 	err = resolve_reflist_entry(&commit_id, re, repo);
8781 	if (err) {
8782 		if (err->code != GOT_ERR_OBJ_TYPE)
8783 			return err;
8784 		else
8785 			return NULL;
8786 	}
8787 
8788 
8789 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8790 	if (tree_view == NULL) {
8791 		err = got_error_from_errno("view_open");
8792 		goto done;
8793 	}
8794 
8795 	err = open_tree_view(tree_view, commit_id,
8796 	    got_ref_get_name(re->ref), repo);
8797 	if (err)
8798 		goto done;
8799 
8800 	*new_view = tree_view;
8801 done:
8802 	free(commit_id);
8803 	return err;
8804 }
8805 
8806 static const struct got_error *
8807 ref_goto_line(struct tog_view *view, int nlines)
8808 {
8809 	const struct got_error		*err = NULL;
8810 	struct tog_ref_view_state	*s = &view->state.ref;
8811 	int				 g, idx = s->selected_entry->idx;
8812 
8813 	g = view->gline;
8814 	view->gline = 0;
8815 
8816 	if (g == 0)
8817 		g = 1;
8818 	else if (g > s->nrefs)
8819 		g = s->nrefs;
8820 
8821 	if (g >= s->first_displayed_entry->idx + 1 &&
8822 	    g <= s->last_displayed_entry->idx + 1 &&
8823 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8824 		s->selected = g - s->first_displayed_entry->idx - 1;
8825 		return NULL;
8826 	}
8827 
8828 	if (idx + 1 < g) {
8829 		err = ref_scroll_down(view, g - idx - 1);
8830 		if (err)
8831 			return err;
8832 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8833 		    s->first_displayed_entry->idx + s->selected < g &&
8834 		    s->selected < s->ndisplayed - 1)
8835 			s->selected = g - s->first_displayed_entry->idx - 1;
8836 	} else if (idx + 1 > g)
8837 		ref_scroll_up(s, idx - g + 1);
8838 
8839 	if (g < nlines && s->first_displayed_entry->idx == 0)
8840 		s->selected = g - 1;
8841 
8842 	return NULL;
8843 
8844 }
8845 
8846 static const struct got_error *
8847 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8848 {
8849 	const struct got_error *err = NULL;
8850 	struct tog_ref_view_state *s = &view->state.ref;
8851 	struct tog_reflist_entry *re;
8852 	int n, nscroll = view->nlines - 1;
8853 
8854 	if (view->gline)
8855 		return ref_goto_line(view, nscroll);
8856 
8857 	switch (ch) {
8858 	case '0':
8859 	case '$':
8860 	case KEY_RIGHT:
8861 	case 'l':
8862 	case KEY_LEFT:
8863 	case 'h':
8864 		horizontal_scroll_input(view, ch);
8865 		break;
8866 	case 'i':
8867 		s->show_ids = !s->show_ids;
8868 		view->count = 0;
8869 		break;
8870 	case 'm':
8871 		s->show_date = !s->show_date;
8872 		view->count = 0;
8873 		break;
8874 	case 'o':
8875 		s->sort_by_date = !s->sort_by_date;
8876 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8877 		view->count = 0;
8878 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8879 		    got_ref_cmp_by_commit_timestamp_descending :
8880 		    tog_ref_cmp_by_name, s->repo);
8881 		if (err)
8882 			break;
8883 		got_reflist_object_id_map_free(tog_refs_idmap);
8884 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8885 		    &tog_refs, s->repo);
8886 		if (err)
8887 			break;
8888 		ref_view_free_refs(s);
8889 		err = ref_view_load_refs(s);
8890 		break;
8891 	case KEY_ENTER:
8892 	case '\r':
8893 		view->count = 0;
8894 		if (!s->selected_entry)
8895 			break;
8896 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8897 		break;
8898 	case 'T':
8899 		view->count = 0;
8900 		if (!s->selected_entry)
8901 			break;
8902 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8903 		break;
8904 	case 'g':
8905 	case '=':
8906 	case KEY_HOME:
8907 		s->selected = 0;
8908 		view->count = 0;
8909 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8910 		break;
8911 	case 'G':
8912 	case '*':
8913 	case KEY_END: {
8914 		int eos = view->nlines - 1;
8915 
8916 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8917 			--eos;  /* border */
8918 		s->selected = 0;
8919 		view->count = 0;
8920 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8921 		for (n = 0; n < eos; n++) {
8922 			if (re == NULL)
8923 				break;
8924 			s->first_displayed_entry = re;
8925 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8926 		}
8927 		if (n > 0)
8928 			s->selected = n - 1;
8929 		break;
8930 	}
8931 	case 'k':
8932 	case KEY_UP:
8933 	case CTRL('p'):
8934 		if (s->selected > 0) {
8935 			s->selected--;
8936 			break;
8937 		}
8938 		ref_scroll_up(s, 1);
8939 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8940 			view->count = 0;
8941 		break;
8942 	case CTRL('u'):
8943 	case 'u':
8944 		nscroll /= 2;
8945 		/* FALL THROUGH */
8946 	case KEY_PPAGE:
8947 	case CTRL('b'):
8948 	case 'b':
8949 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8950 			s->selected -= MIN(nscroll, s->selected);
8951 		ref_scroll_up(s, MAX(0, nscroll));
8952 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8953 			view->count = 0;
8954 		break;
8955 	case 'j':
8956 	case KEY_DOWN:
8957 	case CTRL('n'):
8958 		if (s->selected < s->ndisplayed - 1) {
8959 			s->selected++;
8960 			break;
8961 		}
8962 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8963 			/* can't scroll any further */
8964 			view->count = 0;
8965 			break;
8966 		}
8967 		ref_scroll_down(view, 1);
8968 		break;
8969 	case CTRL('d'):
8970 	case 'd':
8971 		nscroll /= 2;
8972 		/* FALL THROUGH */
8973 	case KEY_NPAGE:
8974 	case CTRL('f'):
8975 	case 'f':
8976 	case ' ':
8977 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8978 			/* can't scroll any further; move cursor down */
8979 			if (s->selected < s->ndisplayed - 1)
8980 				s->selected += MIN(nscroll,
8981 				    s->ndisplayed - s->selected - 1);
8982 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8983 				s->selected += s->ndisplayed - s->selected - 1;
8984 			view->count = 0;
8985 			break;
8986 		}
8987 		ref_scroll_down(view, nscroll);
8988 		break;
8989 	case CTRL('l'):
8990 		view->count = 0;
8991 		tog_free_refs();
8992 		err = tog_load_refs(s->repo, s->sort_by_date);
8993 		if (err)
8994 			break;
8995 		ref_view_free_refs(s);
8996 		err = ref_view_load_refs(s);
8997 		break;
8998 	case KEY_RESIZE:
8999 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9000 			s->selected = view->nlines - 2;
9001 		break;
9002 	default:
9003 		view->count = 0;
9004 		break;
9005 	}
9006 
9007 	return err;
9008 }
9009 
9010 __dead static void
9011 usage_ref(void)
9012 {
9013 	endwin();
9014 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9015 	    getprogname());
9016 	exit(1);
9017 }
9018 
9019 static const struct got_error *
9020 cmd_ref(int argc, char *argv[])
9021 {
9022 	const struct got_error *error;
9023 	struct got_repository *repo = NULL;
9024 	struct got_worktree *worktree = NULL;
9025 	char *cwd = NULL, *repo_path = NULL;
9026 	int ch;
9027 	struct tog_view *view;
9028 	int *pack_fds = NULL;
9029 
9030 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9031 		switch (ch) {
9032 		case 'r':
9033 			repo_path = realpath(optarg, NULL);
9034 			if (repo_path == NULL)
9035 				return got_error_from_errno2("realpath",
9036 				    optarg);
9037 			break;
9038 		default:
9039 			usage_ref();
9040 			/* NOTREACHED */
9041 		}
9042 	}
9043 
9044 	argc -= optind;
9045 	argv += optind;
9046 
9047 	if (argc > 1)
9048 		usage_ref();
9049 
9050 	error = got_repo_pack_fds_open(&pack_fds);
9051 	if (error != NULL)
9052 		goto done;
9053 
9054 	if (repo_path == NULL) {
9055 		cwd = getcwd(NULL, 0);
9056 		if (cwd == NULL)
9057 			return got_error_from_errno("getcwd");
9058 		error = got_worktree_open(&worktree, cwd, NULL);
9059 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9060 			goto done;
9061 		if (worktree)
9062 			repo_path =
9063 			    strdup(got_worktree_get_repo_path(worktree));
9064 		else
9065 			repo_path = strdup(cwd);
9066 		if (repo_path == NULL) {
9067 			error = got_error_from_errno("strdup");
9068 			goto done;
9069 		}
9070 	}
9071 
9072 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9073 	if (error != NULL)
9074 		goto done;
9075 
9076 	init_curses();
9077 
9078 	error = apply_unveil(got_repo_get_path(repo), NULL);
9079 	if (error)
9080 		goto done;
9081 
9082 	error = tog_load_refs(repo, 0);
9083 	if (error)
9084 		goto done;
9085 
9086 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9087 	if (view == NULL) {
9088 		error = got_error_from_errno("view_open");
9089 		goto done;
9090 	}
9091 
9092 	error = open_ref_view(view, repo);
9093 	if (error)
9094 		goto done;
9095 
9096 	if (worktree) {
9097 		error = set_tog_base_commit(repo, worktree);
9098 		if (error != NULL)
9099 			goto done;
9100 
9101 		/* Release work tree lock. */
9102 		got_worktree_close(worktree);
9103 		worktree = NULL;
9104 	}
9105 
9106 	error = view_loop(view);
9107 
9108 done:
9109 	free(tog_base_commit.id);
9110 	free(repo_path);
9111 	free(cwd);
9112 	if (worktree != NULL)
9113 		got_worktree_close(worktree);
9114 	if (repo) {
9115 		const struct got_error *close_err = got_repo_close(repo);
9116 		if (close_err)
9117 			error = close_err;
9118 	}
9119 	if (pack_fds) {
9120 		const struct got_error *pack_err =
9121 		    got_repo_pack_fds_close(pack_fds);
9122 		if (error == NULL)
9123 			error = pack_err;
9124 	}
9125 	tog_free_refs();
9126 	return error;
9127 }
9128 
9129 static const struct got_error*
9130 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9131     const char *str)
9132 {
9133 	size_t len;
9134 
9135 	if (win == NULL)
9136 		win = stdscr;
9137 
9138 	len = strlen(str);
9139 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9140 
9141 	if (focus)
9142 		wstandout(win);
9143 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9144 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9145 	if (focus)
9146 		wstandend(win);
9147 
9148 	return NULL;
9149 }
9150 
9151 static const struct got_error *
9152 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9153 {
9154 	off_t *p;
9155 
9156 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9157 	if (p == NULL) {
9158 		free(*line_offsets);
9159 		*line_offsets = NULL;
9160 		return got_error_from_errno("reallocarray");
9161 	}
9162 
9163 	*line_offsets = p;
9164 	(*line_offsets)[*nlines] = off;
9165 	++(*nlines);
9166 	return NULL;
9167 }
9168 
9169 static const struct got_error *
9170 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9171 {
9172 	*ret = 0;
9173 
9174 	for (;n > 0; --n, ++km) {
9175 		char	*t0, *t, *k;
9176 		size_t	 len = 1;
9177 
9178 		if (km->keys == NULL)
9179 			continue;
9180 
9181 		t = t0 = strdup(km->keys);
9182 		if (t0 == NULL)
9183 			return got_error_from_errno("strdup");
9184 
9185 		len += strlen(t);
9186 		while ((k = strsep(&t, " ")) != NULL)
9187 			len += strlen(k) > 1 ? 2 : 0;
9188 		free(t0);
9189 		*ret = MAX(*ret, len);
9190 	}
9191 
9192 	return NULL;
9193 }
9194 
9195 /*
9196  * Write keymap section headers, keys, and key info in km to f.
9197  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9198  * wrap control and symbolic keys in guillemets, else use <>.
9199  */
9200 static const struct got_error *
9201 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9202 {
9203 	int n, len = width;
9204 
9205 	if (km->keys) {
9206 		static const char *u8_glyph[] = {
9207 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9208 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9209 		};
9210 		char	*t0, *t, *k;
9211 		int	 cs, s, first = 1;
9212 
9213 		cs = got_locale_is_utf8();
9214 
9215 		t = t0 = strdup(km->keys);
9216 		if (t0 == NULL)
9217 			return got_error_from_errno("strdup");
9218 
9219 		len = strlen(km->keys);
9220 		while ((k = strsep(&t, " ")) != NULL) {
9221 			s = strlen(k) > 1;  /* control or symbolic key */
9222 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9223 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9224 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9225 			if (n < 0) {
9226 				free(t0);
9227 				return got_error_from_errno("fprintf");
9228 			}
9229 			first = 0;
9230 			len += s ? 2 : 0;
9231 			*off += n;
9232 		}
9233 		free(t0);
9234 	}
9235 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9236 	if (n < 0)
9237 		return got_error_from_errno("fprintf");
9238 	*off += n;
9239 
9240 	return NULL;
9241 }
9242 
9243 static const struct got_error *
9244 format_help(struct tog_help_view_state *s)
9245 {
9246 	const struct got_error		*err = NULL;
9247 	off_t				 off = 0;
9248 	int				 i, max, n, show = s->all;
9249 	static const struct tog_key_map	 km[] = {
9250 #define KEYMAP_(info, type)	{ NULL, (info), type }
9251 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9252 		GENERATE_HELP
9253 #undef KEYMAP_
9254 #undef KEY_
9255 	};
9256 
9257 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9258 	if (err)
9259 		return err;
9260 
9261 	n = nitems(km);
9262 	err = max_key_str(&max, km, n);
9263 	if (err)
9264 		return err;
9265 
9266 	for (i = 0; i < n; ++i) {
9267 		if (km[i].keys == NULL) {
9268 			show = s->all;
9269 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9270 			    km[i].type == s->type || s->all)
9271 				show = 1;
9272 		}
9273 		if (show) {
9274 			err = format_help_line(&off, s->f, &km[i], max);
9275 			if (err)
9276 				return err;
9277 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9278 			if (err)
9279 				return err;
9280 		}
9281 	}
9282 	fputc('\n', s->f);
9283 	++off;
9284 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9285 	return err;
9286 }
9287 
9288 static const struct got_error *
9289 create_help(struct tog_help_view_state *s)
9290 {
9291 	FILE			*f;
9292 	const struct got_error	*err;
9293 
9294 	free(s->line_offsets);
9295 	s->line_offsets = NULL;
9296 	s->nlines = 0;
9297 
9298 	f = got_opentemp();
9299 	if (f == NULL)
9300 		return got_error_from_errno("got_opentemp");
9301 	s->f = f;
9302 
9303 	err = format_help(s);
9304 	if (err)
9305 		return err;
9306 
9307 	if (s->f && fflush(s->f) != 0)
9308 		return got_error_from_errno("fflush");
9309 
9310 	return NULL;
9311 }
9312 
9313 static const struct got_error *
9314 search_start_help_view(struct tog_view *view)
9315 {
9316 	view->state.help.matched_line = 0;
9317 	return NULL;
9318 }
9319 
9320 static void
9321 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9322     size_t *nlines, int **first, int **last, int **match, int **selected)
9323 {
9324 	struct tog_help_view_state *s = &view->state.help;
9325 
9326 	*f = s->f;
9327 	*nlines = s->nlines;
9328 	*line_offsets = s->line_offsets;
9329 	*match = &s->matched_line;
9330 	*first = &s->first_displayed_line;
9331 	*last = &s->last_displayed_line;
9332 	*selected = &s->selected_line;
9333 }
9334 
9335 static const struct got_error *
9336 show_help_view(struct tog_view *view)
9337 {
9338 	struct tog_help_view_state	*s = &view->state.help;
9339 	const struct got_error		*err;
9340 	regmatch_t			*regmatch = &view->regmatch;
9341 	wchar_t				*wline;
9342 	char				*line;
9343 	ssize_t				 linelen;
9344 	size_t				 linesz = 0;
9345 	int				 width, nprinted = 0, rc = 0;
9346 	int				 eos = view->nlines;
9347 
9348 	if (view_is_hsplit_top(view))
9349 		--eos;  /* account for border */
9350 
9351 	s->lineno = 0;
9352 	rewind(s->f);
9353 	werase(view->window);
9354 
9355 	if (view->gline > s->nlines - 1)
9356 		view->gline = s->nlines - 1;
9357 
9358 	err = win_draw_center(view->window, 0, 0, view->ncols,
9359 	    view_needs_focus_indication(view),
9360 	    "tog help (press q to return to tog)");
9361 	if (err)
9362 		return err;
9363 	if (eos <= 1)
9364 		return NULL;
9365 	waddstr(view->window, "\n\n");
9366 	eos -= 2;
9367 
9368 	s->eof = 0;
9369 	view->maxx = 0;
9370 	line = NULL;
9371 	while (eos > 0 && nprinted < eos) {
9372 		attr_t attr = 0;
9373 
9374 		linelen = getline(&line, &linesz, s->f);
9375 		if (linelen == -1) {
9376 			if (!feof(s->f)) {
9377 				free(line);
9378 				return got_ferror(s->f, GOT_ERR_IO);
9379 			}
9380 			s->eof = 1;
9381 			break;
9382 		}
9383 		if (++s->lineno < s->first_displayed_line)
9384 			continue;
9385 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9386 			continue;
9387 		if (s->lineno == view->hiline)
9388 			attr = A_STANDOUT;
9389 
9390 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9391 		    view->x ? 1 : 0);
9392 		if (err) {
9393 			free(line);
9394 			return err;
9395 		}
9396 		view->maxx = MAX(view->maxx, width);
9397 		free(wline);
9398 		wline = NULL;
9399 
9400 		if (attr)
9401 			wattron(view->window, attr);
9402 		if (s->first_displayed_line + nprinted == s->matched_line &&
9403 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9404 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9405 			    view->window, view->x, regmatch);
9406 			if (err) {
9407 				free(line);
9408 				return err;
9409 			}
9410 		} else {
9411 			int skip;
9412 
9413 			err = format_line(&wline, &width, &skip, line,
9414 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9415 			if (err) {
9416 				free(line);
9417 				return err;
9418 			}
9419 			waddwstr(view->window, &wline[skip]);
9420 			free(wline);
9421 			wline = NULL;
9422 		}
9423 		if (s->lineno == view->hiline) {
9424 			while (width++ < view->ncols)
9425 				waddch(view->window, ' ');
9426 		} else {
9427 			if (width < view->ncols)
9428 				waddch(view->window, '\n');
9429 		}
9430 		if (attr)
9431 			wattroff(view->window, attr);
9432 		if (++nprinted == 1)
9433 			s->first_displayed_line = s->lineno;
9434 	}
9435 	free(line);
9436 	if (nprinted > 0)
9437 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9438 	else
9439 		s->last_displayed_line = s->first_displayed_line;
9440 
9441 	view_border(view);
9442 
9443 	if (s->eof) {
9444 		rc = waddnstr(view->window,
9445 		    "See the tog(1) manual page for full documentation",
9446 		    view->ncols - 1);
9447 		if (rc == ERR)
9448 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9449 	} else {
9450 		wmove(view->window, view->nlines - 1, 0);
9451 		wclrtoeol(view->window);
9452 		wstandout(view->window);
9453 		rc = waddnstr(view->window, "scroll down for more...",
9454 		    view->ncols - 1);
9455 		if (rc == ERR)
9456 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9457 		if (getcurx(view->window) < view->ncols - 6) {
9458 			rc = wprintw(view->window, "[%.0f%%]",
9459 			    100.00 * s->last_displayed_line / s->nlines);
9460 			if (rc == ERR)
9461 				return got_error_msg(GOT_ERR_IO, "wprintw");
9462 		}
9463 		wstandend(view->window);
9464 	}
9465 
9466 	return NULL;
9467 }
9468 
9469 static const struct got_error *
9470 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9471 {
9472 	struct tog_help_view_state	*s = &view->state.help;
9473 	const struct got_error		*err = NULL;
9474 	char				*line = NULL;
9475 	ssize_t				 linelen;
9476 	size_t				 linesz = 0;
9477 	int				 eos, nscroll;
9478 
9479 	eos = nscroll = view->nlines;
9480 	if (view_is_hsplit_top(view))
9481 		--eos;  /* border */
9482 
9483 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9484 
9485 	switch (ch) {
9486 	case '0':
9487 	case '$':
9488 	case KEY_RIGHT:
9489 	case 'l':
9490 	case KEY_LEFT:
9491 	case 'h':
9492 		horizontal_scroll_input(view, ch);
9493 		break;
9494 	case 'g':
9495 	case KEY_HOME:
9496 		s->first_displayed_line = 1;
9497 		view->count = 0;
9498 		break;
9499 	case 'G':
9500 	case KEY_END:
9501 		view->count = 0;
9502 		if (s->eof)
9503 			break;
9504 		s->first_displayed_line = (s->nlines - eos) + 3;
9505 		s->eof = 1;
9506 		break;
9507 	case 'k':
9508 	case KEY_UP:
9509 		if (s->first_displayed_line > 1)
9510 			--s->first_displayed_line;
9511 		else
9512 			view->count = 0;
9513 		break;
9514 	case CTRL('u'):
9515 	case 'u':
9516 		nscroll /= 2;
9517 		/* FALL THROUGH */
9518 	case KEY_PPAGE:
9519 	case CTRL('b'):
9520 	case 'b':
9521 		if (s->first_displayed_line == 1) {
9522 			view->count = 0;
9523 			break;
9524 		}
9525 		while (--nscroll > 0 && s->first_displayed_line > 1)
9526 			s->first_displayed_line--;
9527 		break;
9528 	case 'j':
9529 	case KEY_DOWN:
9530 	case CTRL('n'):
9531 		if (!s->eof)
9532 			++s->first_displayed_line;
9533 		else
9534 			view->count = 0;
9535 		break;
9536 	case CTRL('d'):
9537 	case 'd':
9538 		nscroll /= 2;
9539 		/* FALL THROUGH */
9540 	case KEY_NPAGE:
9541 	case CTRL('f'):
9542 	case 'f':
9543 	case ' ':
9544 		if (s->eof) {
9545 			view->count = 0;
9546 			break;
9547 		}
9548 		while (!s->eof && --nscroll > 0) {
9549 			linelen = getline(&line, &linesz, s->f);
9550 			s->first_displayed_line++;
9551 			if (linelen == -1) {
9552 				if (feof(s->f))
9553 					s->eof = 1;
9554 				else
9555 					err = got_ferror(s->f, GOT_ERR_IO);
9556 				break;
9557 			}
9558 		}
9559 		free(line);
9560 		break;
9561 	default:
9562 		view->count = 0;
9563 		break;
9564 	}
9565 
9566 	return err;
9567 }
9568 
9569 static const struct got_error *
9570 close_help_view(struct tog_view *view)
9571 {
9572 	struct tog_help_view_state *s = &view->state.help;
9573 
9574 	free(s->line_offsets);
9575 	s->line_offsets = NULL;
9576 	if (fclose(s->f) == EOF)
9577 		return got_error_from_errno("fclose");
9578 
9579 	return NULL;
9580 }
9581 
9582 static const struct got_error *
9583 reset_help_view(struct tog_view *view)
9584 {
9585 	struct tog_help_view_state *s = &view->state.help;
9586 
9587 
9588 	if (s->f && fclose(s->f) == EOF)
9589 		return got_error_from_errno("fclose");
9590 
9591 	wclear(view->window);
9592 	view->count = 0;
9593 	view->x = 0;
9594 	s->all = !s->all;
9595 	s->first_displayed_line = 1;
9596 	s->last_displayed_line = view->nlines;
9597 	s->matched_line = 0;
9598 
9599 	return create_help(s);
9600 }
9601 
9602 static const struct got_error *
9603 open_help_view(struct tog_view *view, struct tog_view *parent)
9604 {
9605 	const struct got_error		*err = NULL;
9606 	struct tog_help_view_state	*s = &view->state.help;
9607 
9608 	s->type = (enum tog_keymap_type)parent->type;
9609 	s->first_displayed_line = 1;
9610 	s->last_displayed_line = view->nlines;
9611 	s->selected_line = 1;
9612 
9613 	view->show = show_help_view;
9614 	view->input = input_help_view;
9615 	view->reset = reset_help_view;
9616 	view->close = close_help_view;
9617 	view->search_start = search_start_help_view;
9618 	view->search_setup = search_setup_help_view;
9619 	view->search_next = search_next_view_match;
9620 
9621 	err = create_help(s);
9622 	return err;
9623 }
9624 
9625 static const struct got_error *
9626 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9627     enum tog_view_type request, int y, int x)
9628 {
9629 	const struct got_error *err = NULL;
9630 
9631 	*new_view = NULL;
9632 
9633 	switch (request) {
9634 	case TOG_VIEW_DIFF:
9635 		if (view->type == TOG_VIEW_LOG) {
9636 			struct tog_log_view_state *s = &view->state.log;
9637 
9638 			err = open_diff_view_for_commit(new_view, y, x,
9639 			    s->selected_entry->commit, s->selected_entry->id,
9640 			    view, s->repo);
9641 		} else
9642 			return got_error_msg(GOT_ERR_NOT_IMPL,
9643 			    "parent/child view pair not supported");
9644 		break;
9645 	case TOG_VIEW_BLAME:
9646 		if (view->type == TOG_VIEW_TREE) {
9647 			struct tog_tree_view_state *s = &view->state.tree;
9648 
9649 			err = blame_tree_entry(new_view, y, x,
9650 			    s->selected_entry, &s->parents, s->commit_id,
9651 			    s->repo);
9652 		} else
9653 			return got_error_msg(GOT_ERR_NOT_IMPL,
9654 			    "parent/child view pair not supported");
9655 		break;
9656 	case TOG_VIEW_LOG:
9657 		if (view->type == TOG_VIEW_BLAME)
9658 			err = log_annotated_line(new_view, y, x,
9659 			    view->state.blame.repo, view->state.blame.id_to_log);
9660 		else if (view->type == TOG_VIEW_TREE)
9661 			err = log_selected_tree_entry(new_view, y, x,
9662 			    &view->state.tree);
9663 		else if (view->type == TOG_VIEW_REF)
9664 			err = log_ref_entry(new_view, y, x,
9665 			    view->state.ref.selected_entry,
9666 			    view->state.ref.repo);
9667 		else
9668 			return got_error_msg(GOT_ERR_NOT_IMPL,
9669 			    "parent/child view pair not supported");
9670 		break;
9671 	case TOG_VIEW_TREE:
9672 		if (view->type == TOG_VIEW_LOG)
9673 			err = browse_commit_tree(new_view, y, x,
9674 			    view->state.log.selected_entry,
9675 			    view->state.log.in_repo_path,
9676 			    view->state.log.head_ref_name,
9677 			    view->state.log.repo);
9678 		else if (view->type == TOG_VIEW_REF)
9679 			err = browse_ref_tree(new_view, y, x,
9680 			    view->state.ref.selected_entry,
9681 			    view->state.ref.repo);
9682 		else
9683 			return got_error_msg(GOT_ERR_NOT_IMPL,
9684 			    "parent/child view pair not supported");
9685 		break;
9686 	case TOG_VIEW_REF:
9687 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9688 		if (*new_view == NULL)
9689 			return got_error_from_errno("view_open");
9690 		if (view->type == TOG_VIEW_LOG)
9691 			err = open_ref_view(*new_view, view->state.log.repo);
9692 		else if (view->type == TOG_VIEW_TREE)
9693 			err = open_ref_view(*new_view, view->state.tree.repo);
9694 		else
9695 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9696 			    "parent/child view pair not supported");
9697 		if (err)
9698 			view_close(*new_view);
9699 		break;
9700 	case TOG_VIEW_HELP:
9701 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9702 		if (*new_view == NULL)
9703 			return got_error_from_errno("view_open");
9704 		err = open_help_view(*new_view, view);
9705 		if (err)
9706 			view_close(*new_view);
9707 		break;
9708 	default:
9709 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9710 	}
9711 
9712 	return err;
9713 }
9714 
9715 /*
9716  * If view was scrolled down to move the selected line into view when opening a
9717  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9718  */
9719 static void
9720 offset_selection_up(struct tog_view *view)
9721 {
9722 	switch (view->type) {
9723 	case TOG_VIEW_BLAME: {
9724 		struct tog_blame_view_state *s = &view->state.blame;
9725 		if (s->first_displayed_line == 1) {
9726 			s->selected_line = MAX(s->selected_line - view->offset,
9727 			    1);
9728 			break;
9729 		}
9730 		if (s->first_displayed_line > view->offset)
9731 			s->first_displayed_line -= view->offset;
9732 		else
9733 			s->first_displayed_line = 1;
9734 		s->selected_line += view->offset;
9735 		break;
9736 	}
9737 	case TOG_VIEW_LOG:
9738 		log_scroll_up(&view->state.log, view->offset);
9739 		view->state.log.selected += view->offset;
9740 		break;
9741 	case TOG_VIEW_REF:
9742 		ref_scroll_up(&view->state.ref, view->offset);
9743 		view->state.ref.selected += view->offset;
9744 		break;
9745 	case TOG_VIEW_TREE:
9746 		tree_scroll_up(&view->state.tree, view->offset);
9747 		view->state.tree.selected += view->offset;
9748 		break;
9749 	default:
9750 		break;
9751 	}
9752 
9753 	view->offset = 0;
9754 }
9755 
9756 /*
9757  * If the selected line is in the section of screen covered by the bottom split,
9758  * scroll down offset lines to move it into view and index its new position.
9759  */
9760 static const struct got_error *
9761 offset_selection_down(struct tog_view *view)
9762 {
9763 	const struct got_error	*err = NULL;
9764 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9765 	int			*selected = NULL;
9766 	int			 header, offset;
9767 
9768 	switch (view->type) {
9769 	case TOG_VIEW_BLAME: {
9770 		struct tog_blame_view_state *s = &view->state.blame;
9771 		header = 3;
9772 		scrolld = NULL;
9773 		if (s->selected_line > view->nlines - header) {
9774 			offset = abs(view->nlines - s->selected_line - header);
9775 			s->first_displayed_line += offset;
9776 			s->selected_line -= offset;
9777 			view->offset = offset;
9778 		}
9779 		break;
9780 	}
9781 	case TOG_VIEW_LOG: {
9782 		struct tog_log_view_state *s = &view->state.log;
9783 		scrolld = &log_scroll_down;
9784 		header = view_is_parent_view(view) ? 3 : 2;
9785 		selected = &s->selected;
9786 		break;
9787 	}
9788 	case TOG_VIEW_REF: {
9789 		struct tog_ref_view_state *s = &view->state.ref;
9790 		scrolld = &ref_scroll_down;
9791 		header = 3;
9792 		selected = &s->selected;
9793 		break;
9794 	}
9795 	case TOG_VIEW_TREE: {
9796 		struct tog_tree_view_state *s = &view->state.tree;
9797 		scrolld = &tree_scroll_down;
9798 		header = 5;
9799 		selected = &s->selected;
9800 		break;
9801 	}
9802 	default:
9803 		selected = NULL;
9804 		scrolld = NULL;
9805 		header = 0;
9806 		break;
9807 	}
9808 
9809 	if (selected && *selected > view->nlines - header) {
9810 		offset = abs(view->nlines - *selected - header);
9811 		view->offset = offset;
9812 		if (scrolld && offset) {
9813 			err = scrolld(view, offset);
9814 			*selected -= offset;
9815 		}
9816 	}
9817 
9818 	return err;
9819 }
9820 
9821 static void
9822 list_commands(FILE *fp)
9823 {
9824 	size_t i;
9825 
9826 	fprintf(fp, "commands:");
9827 	for (i = 0; i < nitems(tog_commands); i++) {
9828 		const struct tog_cmd *cmd = &tog_commands[i];
9829 		fprintf(fp, " %s", cmd->name);
9830 	}
9831 	fputc('\n', fp);
9832 }
9833 
9834 __dead static void
9835 usage(int hflag, int status)
9836 {
9837 	FILE *fp = (status == 0) ? stdout : stderr;
9838 
9839 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9840 	    getprogname());
9841 	if (hflag) {
9842 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9843 		list_commands(fp);
9844 	}
9845 	exit(status);
9846 }
9847 
9848 static char **
9849 make_argv(int argc, ...)
9850 {
9851 	va_list ap;
9852 	char **argv;
9853 	int i;
9854 
9855 	va_start(ap, argc);
9856 
9857 	argv = calloc(argc, sizeof(char *));
9858 	if (argv == NULL)
9859 		err(1, "calloc");
9860 	for (i = 0; i < argc; i++) {
9861 		argv[i] = strdup(va_arg(ap, char *));
9862 		if (argv[i] == NULL)
9863 			err(1, "strdup");
9864 	}
9865 
9866 	va_end(ap);
9867 	return argv;
9868 }
9869 
9870 /*
9871  * Try to convert 'tog path' into a 'tog log path' command.
9872  * The user could simply have mistyped the command rather than knowingly
9873  * provided a path. So check whether argv[0] can in fact be resolved
9874  * to a path in the HEAD commit and print a special error if not.
9875  * This hack is for mpi@ <3
9876  */
9877 static const struct got_error *
9878 tog_log_with_path(int argc, char *argv[])
9879 {
9880 	const struct got_error *error = NULL, *close_err;
9881 	const struct tog_cmd *cmd = NULL;
9882 	struct got_repository *repo = NULL;
9883 	struct got_worktree *worktree = NULL;
9884 	struct got_object_id *commit_id = NULL, *id = NULL;
9885 	struct got_commit_object *commit = NULL;
9886 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9887 	char *commit_id_str = NULL, **cmd_argv = NULL;
9888 	int *pack_fds = NULL;
9889 
9890 	cwd = getcwd(NULL, 0);
9891 	if (cwd == NULL)
9892 		return got_error_from_errno("getcwd");
9893 
9894 	error = got_repo_pack_fds_open(&pack_fds);
9895 	if (error != NULL)
9896 		goto done;
9897 
9898 	error = got_worktree_open(&worktree, cwd, NULL);
9899 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9900 		goto done;
9901 
9902 	if (worktree)
9903 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9904 	else
9905 		repo_path = strdup(cwd);
9906 	if (repo_path == NULL) {
9907 		error = got_error_from_errno("strdup");
9908 		goto done;
9909 	}
9910 
9911 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9912 	if (error != NULL)
9913 		goto done;
9914 
9915 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9916 	    repo, worktree);
9917 	if (error)
9918 		goto done;
9919 
9920 	error = tog_load_refs(repo, 0);
9921 	if (error)
9922 		goto done;
9923 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9924 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9925 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9926 	if (error)
9927 		goto done;
9928 
9929 	if (worktree) {
9930 		got_worktree_close(worktree);
9931 		worktree = NULL;
9932 	}
9933 
9934 	error = got_object_open_as_commit(&commit, repo, commit_id);
9935 	if (error)
9936 		goto done;
9937 
9938 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9939 	if (error) {
9940 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9941 			goto done;
9942 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9943 		    getprogname(), argv[0]);
9944 		usage(1, 1);
9945 		/* not reached */
9946 	}
9947 
9948 	error = got_object_id_str(&commit_id_str, commit_id);
9949 	if (error)
9950 		goto done;
9951 
9952 	cmd = &tog_commands[0]; /* log */
9953 	argc = 4;
9954 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9955 	error = cmd->cmd_main(argc, cmd_argv);
9956 done:
9957 	if (repo) {
9958 		close_err = got_repo_close(repo);
9959 		if (error == NULL)
9960 			error = close_err;
9961 	}
9962 	if (commit)
9963 		got_object_commit_close(commit);
9964 	if (worktree)
9965 		got_worktree_close(worktree);
9966 	if (pack_fds) {
9967 		const struct got_error *pack_err =
9968 		    got_repo_pack_fds_close(pack_fds);
9969 		if (error == NULL)
9970 			error = pack_err;
9971 	}
9972 	free(id);
9973 	free(commit_id_str);
9974 	free(commit_id);
9975 	free(cwd);
9976 	free(repo_path);
9977 	free(in_repo_path);
9978 	if (cmd_argv) {
9979 		int i;
9980 		for (i = 0; i < argc; i++)
9981 			free(cmd_argv[i]);
9982 		free(cmd_argv);
9983 	}
9984 	tog_free_refs();
9985 	return error;
9986 }
9987 
9988 int
9989 main(int argc, char *argv[])
9990 {
9991 	const struct got_error *io_err, *error = NULL;
9992 	const struct tog_cmd *cmd = NULL;
9993 	int ch, hflag = 0, Vflag = 0;
9994 	char **cmd_argv = NULL;
9995 	static const struct option longopts[] = {
9996 	    { "version", no_argument, NULL, 'V' },
9997 	    { NULL, 0, NULL, 0}
9998 	};
9999 	char *diff_algo_str = NULL;
10000 	const char *test_script_path;
10001 
10002 	setlocale(LC_CTYPE, "");
10003 
10004 	/*
10005 	 * Test mode init must happen before pledge() because "tty" will
10006 	 * not allow TTY-related ioctls to occur via regular files.
10007 	 */
10008 	test_script_path = getenv("TOG_TEST_SCRIPT");
10009 	if (test_script_path != NULL) {
10010 		error = init_mock_term(test_script_path);
10011 		if (error) {
10012 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10013 			return 1;
10014 		}
10015 	} else if (!isatty(STDIN_FILENO))
10016 		errx(1, "standard input is not a tty");
10017 
10018 #if !defined(PROFILE)
10019 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10020 	    NULL) == -1)
10021 		err(1, "pledge");
10022 #endif
10023 
10024 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10025 		switch (ch) {
10026 		case 'h':
10027 			hflag = 1;
10028 			break;
10029 		case 'V':
10030 			Vflag = 1;
10031 			break;
10032 		default:
10033 			usage(hflag, 1);
10034 			/* NOTREACHED */
10035 		}
10036 	}
10037 
10038 	argc -= optind;
10039 	argv += optind;
10040 	optind = 1;
10041 	optreset = 1;
10042 
10043 	if (Vflag) {
10044 		got_version_print_str();
10045 		return 0;
10046 	}
10047 
10048 	if (argc == 0) {
10049 		if (hflag)
10050 			usage(hflag, 0);
10051 		/* Build an argument vector which runs a default command. */
10052 		cmd = &tog_commands[0];
10053 		argc = 1;
10054 		cmd_argv = make_argv(argc, cmd->name);
10055 	} else {
10056 		size_t i;
10057 
10058 		/* Did the user specify a command? */
10059 		for (i = 0; i < nitems(tog_commands); i++) {
10060 			if (strncmp(tog_commands[i].name, argv[0],
10061 			    strlen(argv[0])) == 0) {
10062 				cmd = &tog_commands[i];
10063 				break;
10064 			}
10065 		}
10066 	}
10067 
10068 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10069 	if (diff_algo_str) {
10070 		if (strcasecmp(diff_algo_str, "patience") == 0)
10071 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10072 		if (strcasecmp(diff_algo_str, "myers") == 0)
10073 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10074 	}
10075 
10076 	if (cmd == NULL) {
10077 		if (argc != 1)
10078 			usage(0, 1);
10079 		/* No command specified; try log with a path */
10080 		error = tog_log_with_path(argc, argv);
10081 	} else {
10082 		if (hflag)
10083 			cmd->cmd_usage();
10084 		else
10085 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10086 	}
10087 
10088 	if (using_mock_io) {
10089 		io_err = tog_io_close();
10090 		if (error == NULL)
10091 			error = io_err;
10092 	}
10093 	endwin();
10094 	if (cmd_argv) {
10095 		int i;
10096 		for (i = 0; i < argc; i++)
10097 			free(cmd_argv[i]);
10098 		free(cmd_argv);
10099 	}
10100 
10101 	if (error && error->code != GOT_ERR_CANCELLED &&
10102 	    error->code != GOT_ERR_EOF &&
10103 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10104 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10105 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10106 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10107 		return 1;
10108 	}
10109 	return 0;
10110 }