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 			tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2489 			if (tc)
2490 				wattr_on(view->window,
2491 				    COLOR_PAIR(tc->colorpair), NULL);
2492 			waddch(view->window, tog_base_commit.marker);
2493 			if (tc)
2494 				wattr_off(view->window,
2495 				    COLOR_PAIR(tc->colorpair), NULL);
2496 		} else
2497 			waddch(view->window, ' ');
2498 		col++;
2499 		author_width++;
2500 	}
2501 	if (tc)
2502 		wattr_off(view->window,
2503 		    COLOR_PAIR(tc->colorpair), NULL);
2504 	if (col > avail)
2505 		goto done;
2506 
2507 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2508 	if (err)
2509 		goto done;
2510 	logmsg = logmsg0;
2511 	while (*logmsg == '\n')
2512 		logmsg++;
2513 	newline = strchr(logmsg, '\n');
2514 	if (newline)
2515 		*newline = '\0';
2516 
2517 	limit = avail - col;
2518 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2519 		limit--;	/* for the border */
2520 
2521 	/* Prepend reference labels to log message if possible .*/
2522 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2523 	err = build_refs_str(&refs_str, refs, id, s->repo);
2524 	if (err)
2525 		goto done;
2526 	if (refs_str) {
2527 		char *rs;
2528 
2529 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2530 			err = got_error_from_errno("asprintf");
2531 			goto done;
2532 		}
2533 		err = format_line(&wrefstr, &refstr_width,
2534 		    &scrollx, rs, view->x, limit, col, 1);
2535 		free(rs);
2536 		if (err)
2537 			goto done;
2538 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2539 		if (tc)
2540 			wattr_on(view->window,
2541 			    COLOR_PAIR(tc->colorpair), NULL);
2542 		waddwstr(view->window, &wrefstr[scrollx]);
2543 		if (tc)
2544 			wattr_off(view->window,
2545 			    COLOR_PAIR(tc->colorpair), NULL);
2546 		col += MAX(refstr_width, 0);
2547 		if (col > avail)
2548 			goto done;
2549 
2550 		if (col < avail) {
2551 			waddch(view->window, ' ');
2552 			col++;
2553 		}
2554 
2555 		if (refstr_width > 0)
2556 			logmsg_x = 0;
2557 		else {
2558 			int unscrolled_refstr_width;
2559 			size_t len = wcslen(wrefstr);
2560 
2561 			/*
2562 			 * No need to check for -1 return value here since
2563 			 * unprintables have been replaced by span_wline().
2564 			 */
2565 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2566 			unscrolled_refstr_width += 1; /* trailing space */
2567 			logmsg_x = view->x - unscrolled_refstr_width;
2568 		}
2569 
2570 		limit = avail - col;
2571 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2572 			limit--;	/* for the border */
2573 	} else
2574 		logmsg_x = view->x;
2575 
2576 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2577 	    limit, col, 1);
2578 	if (err)
2579 		goto done;
2580 	waddwstr(view->window, &wlogmsg[scrollx]);
2581 	col += MAX(logmsg_width, 0);
2582 	while (col < avail) {
2583 		waddch(view->window, ' ');
2584 		col++;
2585 	}
2586 done:
2587 	free(logmsg0);
2588 	free(wlogmsg);
2589 	free(wrefstr);
2590 	free(refs_str);
2591 	free(author);
2592 	free(wauthor);
2593 	free(line);
2594 	return err;
2595 }
2596 
2597 static struct commit_queue_entry *
2598 alloc_commit_queue_entry(struct got_commit_object *commit,
2599     struct got_object_id *id)
2600 {
2601 	struct commit_queue_entry *entry;
2602 	struct got_object_id *dup;
2603 
2604 	entry = calloc(1, sizeof(*entry));
2605 	if (entry == NULL)
2606 		return NULL;
2607 
2608 	dup = got_object_id_dup(id);
2609 	if (dup == NULL) {
2610 		free(entry);
2611 		return NULL;
2612 	}
2613 
2614 	entry->id = dup;
2615 	entry->commit = commit;
2616 	return entry;
2617 }
2618 
2619 static void
2620 pop_commit(struct commit_queue *commits)
2621 {
2622 	struct commit_queue_entry *entry;
2623 
2624 	entry = TAILQ_FIRST(&commits->head);
2625 	TAILQ_REMOVE(&commits->head, entry, entry);
2626 	got_object_commit_close(entry->commit);
2627 	commits->ncommits--;
2628 	free(entry->id);
2629 	free(entry);
2630 }
2631 
2632 static void
2633 free_commits(struct commit_queue *commits)
2634 {
2635 	while (!TAILQ_EMPTY(&commits->head))
2636 		pop_commit(commits);
2637 }
2638 
2639 static const struct got_error *
2640 match_commit(int *have_match, struct got_object_id *id,
2641     struct got_commit_object *commit, regex_t *regex)
2642 {
2643 	const struct got_error *err = NULL;
2644 	regmatch_t regmatch;
2645 	char *id_str = NULL, *logmsg = NULL;
2646 
2647 	*have_match = 0;
2648 
2649 	err = got_object_id_str(&id_str, id);
2650 	if (err)
2651 		return err;
2652 
2653 	err = got_object_commit_get_logmsg(&logmsg, commit);
2654 	if (err)
2655 		goto done;
2656 
2657 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2658 	    &regmatch, 0) == 0 ||
2659 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2660 	    &regmatch, 0) == 0 ||
2661 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2662 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2663 		*have_match = 1;
2664 done:
2665 	free(id_str);
2666 	free(logmsg);
2667 	return err;
2668 }
2669 
2670 static const struct got_error *
2671 queue_commits(struct tog_log_thread_args *a)
2672 {
2673 	const struct got_error *err = NULL;
2674 
2675 	/*
2676 	 * We keep all commits open throughout the lifetime of the log
2677 	 * view in order to avoid having to re-fetch commits from disk
2678 	 * while updating the display.
2679 	 */
2680 	do {
2681 		struct got_object_id id;
2682 		struct got_commit_object *commit;
2683 		struct commit_queue_entry *entry;
2684 		int limit_match = 0;
2685 		int errcode;
2686 
2687 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2688 		    NULL, NULL);
2689 		if (err)
2690 			break;
2691 
2692 		err = got_object_open_as_commit(&commit, a->repo, &id);
2693 		if (err)
2694 			break;
2695 		entry = alloc_commit_queue_entry(commit, &id);
2696 		if (entry == NULL) {
2697 			err = got_error_from_errno("alloc_commit_queue_entry");
2698 			break;
2699 		}
2700 
2701 		errcode = pthread_mutex_lock(&tog_mutex);
2702 		if (errcode) {
2703 			err = got_error_set_errno(errcode,
2704 			    "pthread_mutex_lock");
2705 			break;
2706 		}
2707 
2708 		entry->idx = a->real_commits->ncommits;
2709 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2710 		a->real_commits->ncommits++;
2711 
2712 		if (tog_base_commit.id != NULL && tog_base_commit.idx == -1 &&
2713 		    got_object_id_cmp(&id, tog_base_commit.id) == 0)
2714 			tog_base_commit.idx = entry->idx;
2715 
2716 		if (*a->limiting) {
2717 			err = match_commit(&limit_match, &id, commit,
2718 			    a->limit_regex);
2719 			if (err)
2720 				break;
2721 
2722 			if (limit_match) {
2723 				struct commit_queue_entry *matched;
2724 
2725 				matched = alloc_commit_queue_entry(
2726 				    entry->commit, entry->id);
2727 				if (matched == NULL) {
2728 					err = got_error_from_errno(
2729 					    "alloc_commit_queue_entry");
2730 					break;
2731 				}
2732 				matched->commit = entry->commit;
2733 				got_object_commit_retain(entry->commit);
2734 
2735 				matched->idx = a->limit_commits->ncommits;
2736 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2737 				    matched, entry);
2738 				a->limit_commits->ncommits++;
2739 			}
2740 
2741 			/*
2742 			 * This is how we signal log_thread() that we
2743 			 * have found a match, and that it should be
2744 			 * counted as a new entry for the view.
2745 			 */
2746 			a->limit_match = limit_match;
2747 		}
2748 
2749 		if (*a->searching == TOG_SEARCH_FORWARD &&
2750 		    !*a->search_next_done) {
2751 			int have_match;
2752 			err = match_commit(&have_match, &id, commit, a->regex);
2753 			if (err)
2754 				break;
2755 
2756 			if (*a->limiting) {
2757 				if (limit_match && have_match)
2758 					*a->search_next_done =
2759 					    TOG_SEARCH_HAVE_MORE;
2760 			} else if (have_match)
2761 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2762 		}
2763 
2764 		errcode = pthread_mutex_unlock(&tog_mutex);
2765 		if (errcode && err == NULL)
2766 			err = got_error_set_errno(errcode,
2767 			    "pthread_mutex_unlock");
2768 		if (err)
2769 			break;
2770 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2771 
2772 	return err;
2773 }
2774 
2775 static void
2776 select_commit(struct tog_log_view_state *s)
2777 {
2778 	struct commit_queue_entry *entry;
2779 	int ncommits = 0;
2780 
2781 	entry = s->first_displayed_entry;
2782 	while (entry) {
2783 		if (ncommits == s->selected) {
2784 			s->selected_entry = entry;
2785 			break;
2786 		}
2787 		entry = TAILQ_NEXT(entry, entry);
2788 		ncommits++;
2789 	}
2790 }
2791 
2792 static const struct got_error *
2793 draw_commits(struct tog_view *view)
2794 {
2795 	const struct got_error *err = NULL;
2796 	struct tog_log_view_state *s = &view->state.log;
2797 	struct commit_queue_entry *entry = s->selected_entry;
2798 	int limit = view->nlines;
2799 	int width;
2800 	int ncommits, author_cols = 4, refstr_cols;
2801 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2802 	char *refs_str = NULL;
2803 	wchar_t *wline;
2804 	struct tog_color *tc;
2805 	static const size_t date_display_cols = 12;
2806 	struct got_reflist_head *refs;
2807 
2808 	if (view_is_hsplit_top(view))
2809 		--limit;  /* account for border */
2810 
2811 	if (s->selected_entry &&
2812 	    !(view->searching && view->search_next_done == 0)) {
2813 		err = got_object_id_str(&id_str, s->selected_entry->id);
2814 		if (err)
2815 			return err;
2816 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2817 		    s->selected_entry->id);
2818 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2819 		    s->repo);
2820 		if (err)
2821 			goto done;
2822 	}
2823 
2824 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2825 		halfdelay(10); /* disable fast refresh */
2826 
2827 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2828 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2829 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2830 		    (view->searching && !view->search_next_done) ?
2831 		    "searching..." : "loading...") == -1) {
2832 			err = got_error_from_errno("asprintf");
2833 			goto done;
2834 		}
2835 	} else {
2836 		const char *search_str = NULL;
2837 		const char *limit_str = NULL;
2838 
2839 		if (view->searching) {
2840 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2841 				search_str = "no more matches";
2842 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2843 				search_str = "no matches found";
2844 			else if (!view->search_next_done)
2845 				search_str = "searching...";
2846 		}
2847 
2848 		if (s->limit_view && s->commits->ncommits == 0)
2849 			limit_str = "no matches found";
2850 
2851 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2852 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2853 		    search_str ? search_str : (refs_str ? refs_str : ""),
2854 		    limit_str ? limit_str : "") == -1) {
2855 			err = got_error_from_errno("asprintf");
2856 			goto done;
2857 		}
2858 	}
2859 
2860 	free(refs_str);
2861 	refs_str = NULL;
2862 
2863 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2864 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2865 		    "........................................",
2866 		    s->in_repo_path, ncommits_str) == -1) {
2867 			err = got_error_from_errno("asprintf");
2868 			header = NULL;
2869 			goto done;
2870 		}
2871 	} else if (asprintf(&header, "commit %s%s",
2872 	    id_str ? id_str : "........................................",
2873 	    ncommits_str) == -1) {
2874 		err = got_error_from_errno("asprintf");
2875 		header = NULL;
2876 		goto done;
2877 	}
2878 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2879 	if (err)
2880 		goto done;
2881 
2882 	werase(view->window);
2883 
2884 	if (view_needs_focus_indication(view))
2885 		wstandout(view->window);
2886 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2887 	if (tc)
2888 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2889 	waddwstr(view->window, wline);
2890 	while (width < view->ncols) {
2891 		waddch(view->window, ' ');
2892 		width++;
2893 	}
2894 	if (tc)
2895 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2896 	if (view_needs_focus_indication(view))
2897 		wstandend(view->window);
2898 	free(wline);
2899 	if (limit <= 1)
2900 		goto done;
2901 
2902 	/* Grow author column size if necessary, and set view->maxx. */
2903 	entry = s->first_displayed_entry;
2904 	ncommits = 0;
2905 	view->maxx = 0;
2906 	while (entry) {
2907 		struct got_commit_object *c = entry->commit;
2908 		char *author, *eol, *msg, *msg0;
2909 		wchar_t *wauthor, *wmsg;
2910 		int width;
2911 		if (ncommits >= limit - 1)
2912 			break;
2913 		if (s->use_committer)
2914 			author = strdup(got_object_commit_get_committer(c));
2915 		else
2916 			author = strdup(got_object_commit_get_author(c));
2917 		if (author == NULL) {
2918 			err = got_error_from_errno("strdup");
2919 			goto done;
2920 		}
2921 		err = format_author(&wauthor, &width, author, COLS,
2922 		    date_display_cols);
2923 		if (author_cols < width)
2924 			author_cols = width;
2925 		free(wauthor);
2926 		free(author);
2927 		if (err)
2928 			goto done;
2929 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2930 		    entry->id);
2931 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2932 		if (err)
2933 			goto done;
2934 		if (refs_str) {
2935 			wchar_t *ws;
2936 			err = format_line(&ws, &width, NULL, refs_str,
2937 			    0, INT_MAX, date_display_cols + author_cols, 0);
2938 			free(ws);
2939 			free(refs_str);
2940 			refs_str = NULL;
2941 			if (err)
2942 				goto done;
2943 			refstr_cols = width + 3; /* account for [ ] + space */
2944 		} else
2945 			refstr_cols = 0;
2946 		err = got_object_commit_get_logmsg(&msg0, c);
2947 		if (err)
2948 			goto done;
2949 		msg = msg0;
2950 		while (*msg == '\n')
2951 			++msg;
2952 		if ((eol = strchr(msg, '\n')))
2953 			*eol = '\0';
2954 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2955 		    date_display_cols + author_cols + refstr_cols, 0);
2956 		if (err)
2957 			goto done;
2958 		view->maxx = MAX(view->maxx, width + refstr_cols);
2959 		free(msg0);
2960 		free(wmsg);
2961 		ncommits++;
2962 		entry = TAILQ_NEXT(entry, entry);
2963 	}
2964 
2965 	entry = s->first_displayed_entry;
2966 	s->last_displayed_entry = s->first_displayed_entry;
2967 	ncommits = 0;
2968 	while (entry) {
2969 		if (ncommits >= limit - 1)
2970 			break;
2971 		if (ncommits == s->selected)
2972 			wstandout(view->window);
2973 		err = draw_commit(view, entry, date_display_cols, author_cols);
2974 		if (ncommits == s->selected)
2975 			wstandend(view->window);
2976 		if (err)
2977 			goto done;
2978 		ncommits++;
2979 		s->last_displayed_entry = entry;
2980 		entry = TAILQ_NEXT(entry, entry);
2981 	}
2982 
2983 	view_border(view);
2984 done:
2985 	free(id_str);
2986 	free(refs_str);
2987 	free(ncommits_str);
2988 	free(header);
2989 	return err;
2990 }
2991 
2992 static void
2993 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2994 {
2995 	struct commit_queue_entry *entry;
2996 	int nscrolled = 0;
2997 
2998 	entry = TAILQ_FIRST(&s->commits->head);
2999 	if (s->first_displayed_entry == entry)
3000 		return;
3001 
3002 	entry = s->first_displayed_entry;
3003 	while (entry && nscrolled < maxscroll) {
3004 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
3005 		if (entry) {
3006 			s->first_displayed_entry = entry;
3007 			nscrolled++;
3008 		}
3009 	}
3010 }
3011 
3012 static const struct got_error *
3013 trigger_log_thread(struct tog_view *view, int wait)
3014 {
3015 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
3016 	int errcode;
3017 
3018 	if (!using_mock_io)
3019 		halfdelay(1); /* fast refresh while loading commits */
3020 
3021 	while (!ta->log_complete && !tog_thread_error &&
3022 	    (ta->commits_needed > 0 || ta->load_all)) {
3023 		/* Wake the log thread. */
3024 		errcode = pthread_cond_signal(&ta->need_commits);
3025 		if (errcode)
3026 			return got_error_set_errno(errcode,
3027 			    "pthread_cond_signal");
3028 
3029 		/*
3030 		 * The mutex will be released while the view loop waits
3031 		 * in wgetch(), at which time the log thread will run.
3032 		 */
3033 		if (!wait)
3034 			break;
3035 
3036 		/* Display progress update in log view. */
3037 		show_log_view(view);
3038 		update_panels();
3039 		doupdate();
3040 
3041 		/* Wait right here while next commit is being loaded. */
3042 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3043 		if (errcode)
3044 			return got_error_set_errno(errcode,
3045 			    "pthread_cond_wait");
3046 
3047 		/* Display progress update in log view. */
3048 		show_log_view(view);
3049 		update_panels();
3050 		doupdate();
3051 	}
3052 
3053 	return NULL;
3054 }
3055 
3056 static const struct got_error *
3057 request_log_commits(struct tog_view *view)
3058 {
3059 	struct tog_log_view_state	*state = &view->state.log;
3060 	const struct got_error		*err = NULL;
3061 
3062 	if (state->thread_args.log_complete)
3063 		return NULL;
3064 
3065 	state->thread_args.commits_needed += view->nscrolled;
3066 	err = trigger_log_thread(view, 1);
3067 	view->nscrolled = 0;
3068 
3069 	return err;
3070 }
3071 
3072 static const struct got_error *
3073 log_scroll_down(struct tog_view *view, int maxscroll)
3074 {
3075 	struct tog_log_view_state *s = &view->state.log;
3076 	const struct got_error *err = NULL;
3077 	struct commit_queue_entry *pentry;
3078 	int nscrolled = 0, ncommits_needed;
3079 
3080 	if (s->last_displayed_entry == NULL)
3081 		return NULL;
3082 
3083 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3084 	if (s->commits->ncommits < ncommits_needed &&
3085 	    !s->thread_args.log_complete) {
3086 		/*
3087 		 * Ask the log thread for required amount of commits.
3088 		 */
3089 		s->thread_args.commits_needed +=
3090 		    ncommits_needed - s->commits->ncommits;
3091 		err = trigger_log_thread(view, 1);
3092 		if (err)
3093 			return err;
3094 	}
3095 
3096 	do {
3097 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3098 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3099 			break;
3100 
3101 		s->last_displayed_entry = pentry ?
3102 		    pentry : s->last_displayed_entry;
3103 
3104 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3105 		if (pentry == NULL)
3106 			break;
3107 		s->first_displayed_entry = pentry;
3108 	} while (++nscrolled < maxscroll);
3109 
3110 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3111 		view->nscrolled += nscrolled;
3112 	else
3113 		view->nscrolled = 0;
3114 
3115 	return err;
3116 }
3117 
3118 static const struct got_error *
3119 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3120     struct got_commit_object *commit, struct got_object_id *commit_id,
3121     struct tog_view *log_view, struct got_repository *repo)
3122 {
3123 	const struct got_error *err;
3124 	struct got_object_qid *parent_id;
3125 	struct tog_view *diff_view;
3126 
3127 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3128 	if (diff_view == NULL)
3129 		return got_error_from_errno("view_open");
3130 
3131 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3132 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3133 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3134 	if (err == NULL)
3135 		*new_view = diff_view;
3136 	return err;
3137 }
3138 
3139 static const struct got_error *
3140 tree_view_visit_subtree(struct tog_tree_view_state *s,
3141     struct got_tree_object *subtree)
3142 {
3143 	struct tog_parent_tree *parent;
3144 
3145 	parent = calloc(1, sizeof(*parent));
3146 	if (parent == NULL)
3147 		return got_error_from_errno("calloc");
3148 
3149 	parent->tree = s->tree;
3150 	parent->first_displayed_entry = s->first_displayed_entry;
3151 	parent->selected_entry = s->selected_entry;
3152 	parent->selected = s->selected;
3153 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3154 	s->tree = subtree;
3155 	s->selected = 0;
3156 	s->first_displayed_entry = NULL;
3157 	return NULL;
3158 }
3159 
3160 static const struct got_error *
3161 tree_view_walk_path(struct tog_tree_view_state *s,
3162     struct got_commit_object *commit, const char *path)
3163 {
3164 	const struct got_error *err = NULL;
3165 	struct got_tree_object *tree = NULL;
3166 	const char *p;
3167 	char *slash, *subpath = NULL;
3168 
3169 	/* Walk the path and open corresponding tree objects. */
3170 	p = path;
3171 	while (*p) {
3172 		struct got_tree_entry *te;
3173 		struct got_object_id *tree_id;
3174 		char *te_name;
3175 
3176 		while (p[0] == '/')
3177 			p++;
3178 
3179 		/* Ensure the correct subtree entry is selected. */
3180 		slash = strchr(p, '/');
3181 		if (slash == NULL)
3182 			te_name = strdup(p);
3183 		else
3184 			te_name = strndup(p, slash - p);
3185 		if (te_name == NULL) {
3186 			err = got_error_from_errno("strndup");
3187 			break;
3188 		}
3189 		te = got_object_tree_find_entry(s->tree, te_name);
3190 		if (te == NULL) {
3191 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3192 			free(te_name);
3193 			break;
3194 		}
3195 		free(te_name);
3196 		s->first_displayed_entry = s->selected_entry = te;
3197 
3198 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3199 			break; /* jump to this file's entry */
3200 
3201 		slash = strchr(p, '/');
3202 		if (slash)
3203 			subpath = strndup(path, slash - path);
3204 		else
3205 			subpath = strdup(path);
3206 		if (subpath == NULL) {
3207 			err = got_error_from_errno("strdup");
3208 			break;
3209 		}
3210 
3211 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3212 		    subpath);
3213 		if (err)
3214 			break;
3215 
3216 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3217 		free(tree_id);
3218 		if (err)
3219 			break;
3220 
3221 		err = tree_view_visit_subtree(s, tree);
3222 		if (err) {
3223 			got_object_tree_close(tree);
3224 			break;
3225 		}
3226 		if (slash == NULL)
3227 			break;
3228 		free(subpath);
3229 		subpath = NULL;
3230 		p = slash;
3231 	}
3232 
3233 	free(subpath);
3234 	return err;
3235 }
3236 
3237 static const struct got_error *
3238 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3239     struct commit_queue_entry *entry, const char *path,
3240     const char *head_ref_name, struct got_repository *repo)
3241 {
3242 	const struct got_error *err = NULL;
3243 	struct tog_tree_view_state *s;
3244 	struct tog_view *tree_view;
3245 
3246 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3247 	if (tree_view == NULL)
3248 		return got_error_from_errno("view_open");
3249 
3250 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3251 	if (err)
3252 		return err;
3253 	s = &tree_view->state.tree;
3254 
3255 	*new_view = tree_view;
3256 
3257 	if (got_path_is_root_dir(path))
3258 		return NULL;
3259 
3260 	return tree_view_walk_path(s, entry->commit, path);
3261 }
3262 
3263 static const struct got_error *
3264 block_signals_used_by_main_thread(void)
3265 {
3266 	sigset_t sigset;
3267 	int errcode;
3268 
3269 	if (sigemptyset(&sigset) == -1)
3270 		return got_error_from_errno("sigemptyset");
3271 
3272 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3273 	if (sigaddset(&sigset, SIGWINCH) == -1)
3274 		return got_error_from_errno("sigaddset");
3275 	if (sigaddset(&sigset, SIGCONT) == -1)
3276 		return got_error_from_errno("sigaddset");
3277 	if (sigaddset(&sigset, SIGINT) == -1)
3278 		return got_error_from_errno("sigaddset");
3279 	if (sigaddset(&sigset, SIGTERM) == -1)
3280 		return got_error_from_errno("sigaddset");
3281 
3282 	/* ncurses handles SIGTSTP */
3283 	if (sigaddset(&sigset, SIGTSTP) == -1)
3284 		return got_error_from_errno("sigaddset");
3285 
3286 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3287 	if (errcode)
3288 		return got_error_set_errno(errcode, "pthread_sigmask");
3289 
3290 	return NULL;
3291 }
3292 
3293 static void *
3294 log_thread(void *arg)
3295 {
3296 	const struct got_error *err = NULL;
3297 	int errcode = 0;
3298 	struct tog_log_thread_args *a = arg;
3299 	int done = 0;
3300 
3301 	/*
3302 	 * Sync startup with main thread such that we begin our
3303 	 * work once view_input() has released the mutex.
3304 	 */
3305 	errcode = pthread_mutex_lock(&tog_mutex);
3306 	if (errcode) {
3307 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3308 		return (void *)err;
3309 	}
3310 
3311 	err = block_signals_used_by_main_thread();
3312 	if (err) {
3313 		pthread_mutex_unlock(&tog_mutex);
3314 		goto done;
3315 	}
3316 
3317 	while (!done && !err && !tog_fatal_signal_received()) {
3318 		errcode = pthread_mutex_unlock(&tog_mutex);
3319 		if (errcode) {
3320 			err = got_error_set_errno(errcode,
3321 			    "pthread_mutex_unlock");
3322 			goto done;
3323 		}
3324 		err = queue_commits(a);
3325 		if (err) {
3326 			if (err->code != GOT_ERR_ITER_COMPLETED)
3327 				goto done;
3328 			err = NULL;
3329 			done = 1;
3330 		} else if (a->commits_needed > 0 && !a->load_all) {
3331 			if (*a->limiting) {
3332 				if (a->limit_match)
3333 					a->commits_needed--;
3334 			} else
3335 				a->commits_needed--;
3336 		}
3337 
3338 		errcode = pthread_mutex_lock(&tog_mutex);
3339 		if (errcode) {
3340 			err = got_error_set_errno(errcode,
3341 			    "pthread_mutex_lock");
3342 			goto done;
3343 		} else if (*a->quit)
3344 			done = 1;
3345 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3346 			*a->first_displayed_entry =
3347 			    TAILQ_FIRST(&a->limit_commits->head);
3348 			*a->selected_entry = *a->first_displayed_entry;
3349 		} else if (*a->first_displayed_entry == NULL) {
3350 			*a->first_displayed_entry =
3351 			    TAILQ_FIRST(&a->real_commits->head);
3352 			*a->selected_entry = *a->first_displayed_entry;
3353 		}
3354 
3355 		errcode = pthread_cond_signal(&a->commit_loaded);
3356 		if (errcode) {
3357 			err = got_error_set_errno(errcode,
3358 			    "pthread_cond_signal");
3359 			pthread_mutex_unlock(&tog_mutex);
3360 			goto done;
3361 		}
3362 
3363 		if (done)
3364 			a->commits_needed = 0;
3365 		else {
3366 			if (a->commits_needed == 0 && !a->load_all) {
3367 				errcode = pthread_cond_wait(&a->need_commits,
3368 				    &tog_mutex);
3369 				if (errcode) {
3370 					err = got_error_set_errno(errcode,
3371 					    "pthread_cond_wait");
3372 					pthread_mutex_unlock(&tog_mutex);
3373 					goto done;
3374 				}
3375 				if (*a->quit)
3376 					done = 1;
3377 			}
3378 		}
3379 	}
3380 	a->log_complete = 1;
3381 	errcode = pthread_mutex_unlock(&tog_mutex);
3382 	if (errcode)
3383 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3384 done:
3385 	if (err) {
3386 		tog_thread_error = 1;
3387 		pthread_cond_signal(&a->commit_loaded);
3388 	}
3389 	return (void *)err;
3390 }
3391 
3392 static const struct got_error *
3393 stop_log_thread(struct tog_log_view_state *s)
3394 {
3395 	const struct got_error *err = NULL, *thread_err = NULL;
3396 	int errcode;
3397 
3398 	if (s->thread) {
3399 		s->quit = 1;
3400 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3401 		if (errcode)
3402 			return got_error_set_errno(errcode,
3403 			    "pthread_cond_signal");
3404 		errcode = pthread_mutex_unlock(&tog_mutex);
3405 		if (errcode)
3406 			return got_error_set_errno(errcode,
3407 			    "pthread_mutex_unlock");
3408 		errcode = pthread_join(s->thread, (void **)&thread_err);
3409 		if (errcode)
3410 			return got_error_set_errno(errcode, "pthread_join");
3411 		errcode = pthread_mutex_lock(&tog_mutex);
3412 		if (errcode)
3413 			return got_error_set_errno(errcode,
3414 			    "pthread_mutex_lock");
3415 		s->thread = NULL;
3416 	}
3417 
3418 	if (s->thread_args.repo) {
3419 		err = got_repo_close(s->thread_args.repo);
3420 		s->thread_args.repo = NULL;
3421 	}
3422 
3423 	if (s->thread_args.pack_fds) {
3424 		const struct got_error *pack_err =
3425 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3426 		if (err == NULL)
3427 			err = pack_err;
3428 		s->thread_args.pack_fds = NULL;
3429 	}
3430 
3431 	if (s->thread_args.graph) {
3432 		got_commit_graph_close(s->thread_args.graph);
3433 		s->thread_args.graph = NULL;
3434 	}
3435 
3436 	return err ? err : thread_err;
3437 }
3438 
3439 static const struct got_error *
3440 close_log_view(struct tog_view *view)
3441 {
3442 	const struct got_error *err = NULL;
3443 	struct tog_log_view_state *s = &view->state.log;
3444 	int errcode;
3445 
3446 	err = stop_log_thread(s);
3447 
3448 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3449 	if (errcode && err == NULL)
3450 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3451 
3452 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3453 	if (errcode && err == NULL)
3454 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3455 
3456 	free_commits(&s->limit_commits);
3457 	free_commits(&s->real_commits);
3458 	free(s->in_repo_path);
3459 	s->in_repo_path = NULL;
3460 	free(s->start_id);
3461 	s->start_id = NULL;
3462 	free(s->head_ref_name);
3463 	s->head_ref_name = NULL;
3464 	return err;
3465 }
3466 
3467 /*
3468  * We use two queues to implement the limit feature: first consists of
3469  * commits matching the current limit_regex; second is the real queue
3470  * of all known commits (real_commits). When the user starts limiting,
3471  * we swap queues such that all movement and displaying functionality
3472  * works with very slight change.
3473  */
3474 static const struct got_error *
3475 limit_log_view(struct tog_view *view)
3476 {
3477 	struct tog_log_view_state *s = &view->state.log;
3478 	struct commit_queue_entry *entry;
3479 	struct tog_view	*v = view;
3480 	const struct got_error *err = NULL;
3481 	char pattern[1024];
3482 	int ret;
3483 
3484 	if (view_is_hsplit_top(view))
3485 		v = view->child;
3486 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3487 		v = view->parent;
3488 
3489 	/* Get the pattern */
3490 	wmove(v->window, v->nlines - 1, 0);
3491 	wclrtoeol(v->window);
3492 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3493 	nodelay(v->window, FALSE);
3494 	nocbreak();
3495 	echo();
3496 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3497 	cbreak();
3498 	noecho();
3499 	nodelay(v->window, TRUE);
3500 	if (ret == ERR)
3501 		return NULL;
3502 
3503 	if (*pattern == '\0') {
3504 		/*
3505 		 * Safety measure for the situation where the user
3506 		 * resets limit without previously limiting anything.
3507 		 */
3508 		if (!s->limit_view)
3509 			return NULL;
3510 
3511 		/*
3512 		 * User could have pressed Ctrl+L, which refreshed the
3513 		 * commit queues, it means we can't save previously
3514 		 * (before limit took place) displayed entries,
3515 		 * because they would point to already free'ed memory,
3516 		 * so we are forced to always select first entry of
3517 		 * the queue.
3518 		 */
3519 		s->commits = &s->real_commits;
3520 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3521 		s->selected_entry = s->first_displayed_entry;
3522 		s->selected = 0;
3523 		s->limit_view = 0;
3524 
3525 		return NULL;
3526 	}
3527 
3528 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3529 		return NULL;
3530 
3531 	s->limit_view = 1;
3532 
3533 	/* Clear the screen while loading limit view */
3534 	s->first_displayed_entry = NULL;
3535 	s->last_displayed_entry = NULL;
3536 	s->selected_entry = NULL;
3537 	s->commits = &s->limit_commits;
3538 
3539 	/* Prepare limit queue for new search */
3540 	free_commits(&s->limit_commits);
3541 	s->limit_commits.ncommits = 0;
3542 
3543 	/* First process commits, which are in queue already */
3544 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3545 		int have_match = 0;
3546 
3547 		err = match_commit(&have_match, entry->id,
3548 		    entry->commit, &s->limit_regex);
3549 		if (err)
3550 			return err;
3551 
3552 		if (have_match) {
3553 			struct commit_queue_entry *matched;
3554 
3555 			matched = alloc_commit_queue_entry(entry->commit,
3556 			    entry->id);
3557 			if (matched == NULL) {
3558 				err = got_error_from_errno(
3559 				    "alloc_commit_queue_entry");
3560 				break;
3561 			}
3562 			matched->commit = entry->commit;
3563 			got_object_commit_retain(entry->commit);
3564 
3565 			matched->idx = s->limit_commits.ncommits;
3566 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3567 			    matched, entry);
3568 			s->limit_commits.ncommits++;
3569 		}
3570 	}
3571 
3572 	/* Second process all the commits, until we fill the screen */
3573 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3574 	    !s->thread_args.log_complete) {
3575 		s->thread_args.commits_needed +=
3576 		    view->nlines - s->limit_commits.ncommits - 1;
3577 		err = trigger_log_thread(view, 1);
3578 		if (err)
3579 			return err;
3580 	}
3581 
3582 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3583 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3584 	s->selected = 0;
3585 
3586 	return NULL;
3587 }
3588 
3589 static const struct got_error *
3590 search_start_log_view(struct tog_view *view)
3591 {
3592 	struct tog_log_view_state *s = &view->state.log;
3593 
3594 	s->matched_entry = NULL;
3595 	s->search_entry = NULL;
3596 	return NULL;
3597 }
3598 
3599 static const struct got_error *
3600 search_next_log_view(struct tog_view *view)
3601 {
3602 	const struct got_error *err = NULL;
3603 	struct tog_log_view_state *s = &view->state.log;
3604 	struct commit_queue_entry *entry;
3605 
3606 	/* Display progress update in log view. */
3607 	show_log_view(view);
3608 	update_panels();
3609 	doupdate();
3610 
3611 	if (s->search_entry) {
3612 		int errcode, ch;
3613 		errcode = pthread_mutex_unlock(&tog_mutex);
3614 		if (errcode)
3615 			return got_error_set_errno(errcode,
3616 			    "pthread_mutex_unlock");
3617 		ch = wgetch(view->window);
3618 		errcode = pthread_mutex_lock(&tog_mutex);
3619 		if (errcode)
3620 			return got_error_set_errno(errcode,
3621 			    "pthread_mutex_lock");
3622 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3623 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3624 			return NULL;
3625 		}
3626 		if (view->searching == TOG_SEARCH_FORWARD)
3627 			entry = TAILQ_NEXT(s->search_entry, entry);
3628 		else
3629 			entry = TAILQ_PREV(s->search_entry,
3630 			    commit_queue_head, entry);
3631 	} else if (s->matched_entry) {
3632 		/*
3633 		 * If the user has moved the cursor after we hit a match,
3634 		 * the position from where we should continue searching
3635 		 * might have changed.
3636 		 */
3637 		if (view->searching == TOG_SEARCH_FORWARD)
3638 			entry = TAILQ_NEXT(s->selected_entry, entry);
3639 		else
3640 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3641 			    entry);
3642 	} else {
3643 		entry = s->selected_entry;
3644 	}
3645 
3646 	while (1) {
3647 		int have_match = 0;
3648 
3649 		if (entry == NULL) {
3650 			if (s->thread_args.log_complete ||
3651 			    view->searching == TOG_SEARCH_BACKWARD) {
3652 				view->search_next_done =
3653 				    (s->matched_entry == NULL ?
3654 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3655 				s->search_entry = NULL;
3656 				return NULL;
3657 			}
3658 			/*
3659 			 * Poke the log thread for more commits and return,
3660 			 * allowing the main loop to make progress. Search
3661 			 * will resume at s->search_entry once we come back.
3662 			 */
3663 			s->thread_args.commits_needed++;
3664 			return trigger_log_thread(view, 0);
3665 		}
3666 
3667 		err = match_commit(&have_match, entry->id, entry->commit,
3668 		    &view->regex);
3669 		if (err)
3670 			break;
3671 		if (have_match) {
3672 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3673 			s->matched_entry = entry;
3674 			break;
3675 		}
3676 
3677 		s->search_entry = entry;
3678 		if (view->searching == TOG_SEARCH_FORWARD)
3679 			entry = TAILQ_NEXT(entry, entry);
3680 		else
3681 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3682 	}
3683 
3684 	if (s->matched_entry) {
3685 		int cur = s->selected_entry->idx;
3686 		while (cur < s->matched_entry->idx) {
3687 			err = input_log_view(NULL, view, KEY_DOWN);
3688 			if (err)
3689 				return err;
3690 			cur++;
3691 		}
3692 		while (cur > s->matched_entry->idx) {
3693 			err = input_log_view(NULL, view, KEY_UP);
3694 			if (err)
3695 				return err;
3696 			cur--;
3697 		}
3698 	}
3699 
3700 	s->search_entry = NULL;
3701 
3702 	return NULL;
3703 }
3704 
3705 static const struct got_error *
3706 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3707     struct got_repository *repo, const char *head_ref_name,
3708     const char *in_repo_path, int log_branches)
3709 {
3710 	const struct got_error *err = NULL;
3711 	struct tog_log_view_state *s = &view->state.log;
3712 	struct got_repository *thread_repo = NULL;
3713 	struct got_commit_graph *thread_graph = NULL;
3714 	int errcode;
3715 
3716 	if (in_repo_path != s->in_repo_path) {
3717 		free(s->in_repo_path);
3718 		s->in_repo_path = strdup(in_repo_path);
3719 		if (s->in_repo_path == NULL) {
3720 			err = got_error_from_errno("strdup");
3721 			goto done;
3722 		}
3723 	}
3724 
3725 	/* The commit queue only contains commits being displayed. */
3726 	TAILQ_INIT(&s->real_commits.head);
3727 	s->real_commits.ncommits = 0;
3728 	s->commits = &s->real_commits;
3729 
3730 	TAILQ_INIT(&s->limit_commits.head);
3731 	s->limit_view = 0;
3732 	s->limit_commits.ncommits = 0;
3733 
3734 	s->repo = repo;
3735 	if (head_ref_name) {
3736 		s->head_ref_name = strdup(head_ref_name);
3737 		if (s->head_ref_name == NULL) {
3738 			err = got_error_from_errno("strdup");
3739 			goto done;
3740 		}
3741 	}
3742 	s->start_id = got_object_id_dup(start_id);
3743 	if (s->start_id == NULL) {
3744 		err = got_error_from_errno("got_object_id_dup");
3745 		goto done;
3746 	}
3747 	s->log_branches = log_branches;
3748 	s->use_committer = 1;
3749 
3750 	STAILQ_INIT(&s->colors);
3751 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3752 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3753 		    get_color_value("TOG_COLOR_COMMIT"));
3754 		if (err)
3755 			goto done;
3756 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3757 		    get_color_value("TOG_COLOR_AUTHOR"));
3758 		if (err) {
3759 			free_colors(&s->colors);
3760 			goto done;
3761 		}
3762 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3763 		    get_color_value("TOG_COLOR_DATE"));
3764 		if (err) {
3765 			free_colors(&s->colors);
3766 			goto done;
3767 		}
3768 	}
3769 
3770 	view->show = show_log_view;
3771 	view->input = input_log_view;
3772 	view->resize = resize_log_view;
3773 	view->close = close_log_view;
3774 	view->search_start = search_start_log_view;
3775 	view->search_next = search_next_log_view;
3776 
3777 	if (s->thread_args.pack_fds == NULL) {
3778 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3779 		if (err)
3780 			goto done;
3781 	}
3782 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3783 	    s->thread_args.pack_fds);
3784 	if (err)
3785 		goto done;
3786 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3787 	    !s->log_branches);
3788 	if (err)
3789 		goto done;
3790 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3791 	    s->repo, NULL, NULL);
3792 	if (err)
3793 		goto done;
3794 
3795 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3796 	if (errcode) {
3797 		err = got_error_set_errno(errcode, "pthread_cond_init");
3798 		goto done;
3799 	}
3800 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3801 	if (errcode) {
3802 		err = got_error_set_errno(errcode, "pthread_cond_init");
3803 		goto done;
3804 	}
3805 
3806 	s->thread_args.commits_needed = view->nlines;
3807 	s->thread_args.graph = thread_graph;
3808 	s->thread_args.real_commits = &s->real_commits;
3809 	s->thread_args.limit_commits = &s->limit_commits;
3810 	s->thread_args.in_repo_path = s->in_repo_path;
3811 	s->thread_args.start_id = s->start_id;
3812 	s->thread_args.repo = thread_repo;
3813 	s->thread_args.log_complete = 0;
3814 	s->thread_args.quit = &s->quit;
3815 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3816 	s->thread_args.selected_entry = &s->selected_entry;
3817 	s->thread_args.searching = &view->searching;
3818 	s->thread_args.search_next_done = &view->search_next_done;
3819 	s->thread_args.regex = &view->regex;
3820 	s->thread_args.limiting = &s->limit_view;
3821 	s->thread_args.limit_regex = &s->limit_regex;
3822 	s->thread_args.limit_commits = &s->limit_commits;
3823 done:
3824 	if (err) {
3825 		if (view->close == NULL)
3826 			close_log_view(view);
3827 		view_close(view);
3828 	}
3829 	return err;
3830 }
3831 
3832 static const struct got_error *
3833 show_log_view(struct tog_view *view)
3834 {
3835 	const struct got_error *err;
3836 	struct tog_log_view_state *s = &view->state.log;
3837 
3838 	if (s->thread == NULL) {
3839 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3840 		    &s->thread_args);
3841 		if (errcode)
3842 			return got_error_set_errno(errcode, "pthread_create");
3843 		if (s->thread_args.commits_needed > 0) {
3844 			err = trigger_log_thread(view, 1);
3845 			if (err)
3846 				return err;
3847 		}
3848 	}
3849 
3850 	return draw_commits(view);
3851 }
3852 
3853 static void
3854 log_move_cursor_up(struct tog_view *view, int page, int home)
3855 {
3856 	struct tog_log_view_state *s = &view->state.log;
3857 
3858 	if (s->first_displayed_entry == NULL)
3859 		return;
3860 	if (s->selected_entry->idx == 0)
3861 		view->count = 0;
3862 
3863 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3864 	    || home)
3865 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3866 
3867 	if (!page && !home && s->selected > 0)
3868 		--s->selected;
3869 	else
3870 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3871 
3872 	select_commit(s);
3873 	return;
3874 }
3875 
3876 static const struct got_error *
3877 log_move_cursor_down(struct tog_view *view, int page)
3878 {
3879 	struct tog_log_view_state	*s = &view->state.log;
3880 	const struct got_error		*err = NULL;
3881 	int				 eos = view->nlines - 2;
3882 
3883 	if (s->first_displayed_entry == NULL)
3884 		return NULL;
3885 
3886 	if (s->thread_args.log_complete &&
3887 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3888 		return NULL;
3889 
3890 	if (view_is_hsplit_top(view))
3891 		--eos;  /* border consumes the last line */
3892 
3893 	if (!page) {
3894 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3895 			++s->selected;
3896 		else
3897 			err = log_scroll_down(view, 1);
3898 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3899 		struct commit_queue_entry *entry;
3900 		int n;
3901 
3902 		s->selected = 0;
3903 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3904 		s->last_displayed_entry = entry;
3905 		for (n = 0; n <= eos; n++) {
3906 			if (entry == NULL)
3907 				break;
3908 			s->first_displayed_entry = entry;
3909 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3910 		}
3911 		if (n > 0)
3912 			s->selected = n - 1;
3913 	} else {
3914 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3915 		    s->thread_args.log_complete)
3916 			s->selected += MIN(page,
3917 			    s->commits->ncommits - s->selected_entry->idx - 1);
3918 		else
3919 			err = log_scroll_down(view, page);
3920 	}
3921 	if (err)
3922 		return err;
3923 
3924 	/*
3925 	 * We might necessarily overshoot in horizontal
3926 	 * splits; if so, select the last displayed commit.
3927 	 */
3928 	if (s->first_displayed_entry && s->last_displayed_entry) {
3929 		s->selected = MIN(s->selected,
3930 		    s->last_displayed_entry->idx -
3931 		    s->first_displayed_entry->idx);
3932 	}
3933 
3934 	select_commit(s);
3935 
3936 	if (s->thread_args.log_complete &&
3937 	    s->selected_entry->idx == s->commits->ncommits - 1)
3938 		view->count = 0;
3939 
3940 	return NULL;
3941 }
3942 
3943 static void
3944 view_get_split(struct tog_view *view, int *y, int *x)
3945 {
3946 	*x = 0;
3947 	*y = 0;
3948 
3949 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3950 		if (view->child && view->child->resized_y)
3951 			*y = view->child->resized_y;
3952 		else if (view->resized_y)
3953 			*y = view->resized_y;
3954 		else
3955 			*y = view_split_begin_y(view->lines);
3956 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3957 		if (view->child && view->child->resized_x)
3958 			*x = view->child->resized_x;
3959 		else if (view->resized_x)
3960 			*x = view->resized_x;
3961 		else
3962 			*x = view_split_begin_x(view->begin_x);
3963 	}
3964 }
3965 
3966 /* Split view horizontally at y and offset view->state->selected line. */
3967 static const struct got_error *
3968 view_init_hsplit(struct tog_view *view, int y)
3969 {
3970 	const struct got_error *err = NULL;
3971 
3972 	view->nlines = y;
3973 	view->ncols = COLS;
3974 	err = view_resize(view);
3975 	if (err)
3976 		return err;
3977 
3978 	err = offset_selection_down(view);
3979 
3980 	return err;
3981 }
3982 
3983 static const struct got_error *
3984 log_goto_line(struct tog_view *view, int nlines)
3985 {
3986 	const struct got_error		*err = NULL;
3987 	struct tog_log_view_state	*s = &view->state.log;
3988 	int				 g, idx = s->selected_entry->idx;
3989 
3990 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3991 		return NULL;
3992 
3993 	g = view->gline;
3994 	view->gline = 0;
3995 
3996 	if (g >= s->first_displayed_entry->idx + 1 &&
3997 	    g <= s->last_displayed_entry->idx + 1 &&
3998 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3999 		s->selected = g - s->first_displayed_entry->idx - 1;
4000 		select_commit(s);
4001 		return NULL;
4002 	}
4003 
4004 	if (idx + 1 < g) {
4005 		err = log_move_cursor_down(view, g - idx - 1);
4006 		if (!err && g > s->selected_entry->idx + 1)
4007 			err = log_move_cursor_down(view,
4008 			    g - s->first_displayed_entry->idx - 1);
4009 		if (err)
4010 			return err;
4011 	} else if (idx + 1 > g)
4012 		log_move_cursor_up(view, idx - g + 1, 0);
4013 
4014 	if (g < nlines && s->first_displayed_entry->idx == 0)
4015 		s->selected = g - 1;
4016 
4017 	select_commit(s);
4018 	return NULL;
4019 
4020 }
4021 
4022 static void
4023 horizontal_scroll_input(struct tog_view *view, int ch)
4024 {
4025 
4026 	switch (ch) {
4027 	case KEY_LEFT:
4028 	case 'h':
4029 		view->x -= MIN(view->x, 2);
4030 		if (view->x <= 0)
4031 			view->count = 0;
4032 		break;
4033 	case KEY_RIGHT:
4034 	case 'l':
4035 		if (view->x + view->ncols / 2 < view->maxx)
4036 			view->x += 2;
4037 		else
4038 			view->count = 0;
4039 		break;
4040 	case '0':
4041 		view->x = 0;
4042 		break;
4043 	case '$':
4044 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4045 		view->count = 0;
4046 		break;
4047 	default:
4048 		break;
4049 	}
4050 }
4051 
4052 static const struct got_error *
4053 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4054 {
4055 	const struct got_error *err = NULL;
4056 	struct tog_log_view_state *s = &view->state.log;
4057 	int eos, nscroll;
4058 
4059 	if (s->thread_args.load_all) {
4060 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4061 			s->thread_args.load_all = 0;
4062 		else if (s->thread_args.log_complete) {
4063 			err = log_move_cursor_down(view, s->commits->ncommits);
4064 			s->thread_args.load_all = 0;
4065 		}
4066 		if (err)
4067 			return err;
4068 	}
4069 
4070 	eos = nscroll = view->nlines - 1;
4071 	if (view_is_hsplit_top(view))
4072 		--eos;  /* border */
4073 
4074 	if (view->gline)
4075 		return log_goto_line(view, eos);
4076 
4077 	switch (ch) {
4078 	case '&':
4079 		err = limit_log_view(view);
4080 		break;
4081 	case 'q':
4082 		s->quit = 1;
4083 		break;
4084 	case '0':
4085 	case '$':
4086 	case KEY_RIGHT:
4087 	case 'l':
4088 	case KEY_LEFT:
4089 	case 'h':
4090 		horizontal_scroll_input(view, ch);
4091 		break;
4092 	case 'k':
4093 	case KEY_UP:
4094 	case '<':
4095 	case ',':
4096 	case CTRL('p'):
4097 		log_move_cursor_up(view, 0, 0);
4098 		break;
4099 	case 'g':
4100 	case '=':
4101 	case KEY_HOME:
4102 		log_move_cursor_up(view, 0, 1);
4103 		view->count = 0;
4104 		break;
4105 	case CTRL('u'):
4106 	case 'u':
4107 		nscroll /= 2;
4108 		/* FALL THROUGH */
4109 	case KEY_PPAGE:
4110 	case CTRL('b'):
4111 	case 'b':
4112 		log_move_cursor_up(view, nscroll, 0);
4113 		break;
4114 	case 'j':
4115 	case KEY_DOWN:
4116 	case '>':
4117 	case '.':
4118 	case CTRL('n'):
4119 		err = log_move_cursor_down(view, 0);
4120 		break;
4121 	case '@':
4122 		s->use_committer = !s->use_committer;
4123 		view->action = s->use_committer ?
4124 		    "show committer" : "show commit author";
4125 		break;
4126 	case 'G':
4127 	case '*':
4128 	case KEY_END: {
4129 		/* We don't know yet how many commits, so we're forced to
4130 		 * traverse them all. */
4131 		view->count = 0;
4132 		s->thread_args.load_all = 1;
4133 		if (!s->thread_args.log_complete)
4134 			return trigger_log_thread(view, 0);
4135 		err = log_move_cursor_down(view, s->commits->ncommits);
4136 		s->thread_args.load_all = 0;
4137 		break;
4138 	}
4139 	case CTRL('d'):
4140 	case 'd':
4141 		nscroll /= 2;
4142 		/* FALL THROUGH */
4143 	case KEY_NPAGE:
4144 	case CTRL('f'):
4145 	case 'f':
4146 	case ' ':
4147 		err = log_move_cursor_down(view, nscroll);
4148 		break;
4149 	case KEY_RESIZE:
4150 		if (s->selected > view->nlines - 2)
4151 			s->selected = view->nlines - 2;
4152 		if (s->selected > s->commits->ncommits - 1)
4153 			s->selected = s->commits->ncommits - 1;
4154 		select_commit(s);
4155 		if (s->commits->ncommits < view->nlines - 1 &&
4156 		    !s->thread_args.log_complete) {
4157 			s->thread_args.commits_needed += (view->nlines - 1) -
4158 			    s->commits->ncommits;
4159 			err = trigger_log_thread(view, 1);
4160 		}
4161 		break;
4162 	case KEY_ENTER:
4163 	case '\r':
4164 		view->count = 0;
4165 		if (s->selected_entry == NULL)
4166 			break;
4167 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4168 		break;
4169 	case 'T':
4170 		view->count = 0;
4171 		if (s->selected_entry == NULL)
4172 			break;
4173 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4174 		break;
4175 	case KEY_BACKSPACE:
4176 	case CTRL('l'):
4177 	case 'B':
4178 		view->count = 0;
4179 		if (ch == KEY_BACKSPACE &&
4180 		    got_path_is_root_dir(s->in_repo_path))
4181 			break;
4182 		err = stop_log_thread(s);
4183 		if (err)
4184 			return err;
4185 		if (ch == KEY_BACKSPACE) {
4186 			char *parent_path;
4187 			err = got_path_dirname(&parent_path, s->in_repo_path);
4188 			if (err)
4189 				return err;
4190 			free(s->in_repo_path);
4191 			s->in_repo_path = parent_path;
4192 			s->thread_args.in_repo_path = s->in_repo_path;
4193 		} else if (ch == CTRL('l')) {
4194 			struct got_object_id *start_id;
4195 			err = got_repo_match_object_id(&start_id, NULL,
4196 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4197 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4198 			if (err) {
4199 				if (s->head_ref_name == NULL ||
4200 				    err->code != GOT_ERR_NOT_REF)
4201 					return err;
4202 				/* Try to cope with deleted references. */
4203 				free(s->head_ref_name);
4204 				s->head_ref_name = NULL;
4205 				err = got_repo_match_object_id(&start_id,
4206 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4207 				    &tog_refs, s->repo);
4208 				if (err)
4209 					return err;
4210 			}
4211 			free(s->start_id);
4212 			s->start_id = start_id;
4213 			s->thread_args.start_id = s->start_id;
4214 		} else /* 'B' */
4215 			s->log_branches = !s->log_branches;
4216 
4217 		if (s->thread_args.pack_fds == NULL) {
4218 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4219 			if (err)
4220 				return err;
4221 		}
4222 		err = got_repo_open(&s->thread_args.repo,
4223 		    got_repo_get_path(s->repo), NULL,
4224 		    s->thread_args.pack_fds);
4225 		if (err)
4226 			return err;
4227 		tog_free_refs();
4228 		err = tog_load_refs(s->repo, 0);
4229 		if (err)
4230 			return err;
4231 		err = got_commit_graph_open(&s->thread_args.graph,
4232 		    s->in_repo_path, !s->log_branches);
4233 		if (err)
4234 			return err;
4235 		err = got_commit_graph_iter_start(s->thread_args.graph,
4236 		    s->start_id, s->repo, NULL, NULL);
4237 		if (err)
4238 			return err;
4239 		free_commits(&s->real_commits);
4240 		free_commits(&s->limit_commits);
4241 		s->first_displayed_entry = NULL;
4242 		s->last_displayed_entry = NULL;
4243 		s->selected_entry = NULL;
4244 		s->selected = 0;
4245 		s->thread_args.log_complete = 0;
4246 		s->quit = 0;
4247 		s->thread_args.commits_needed = view->lines;
4248 		s->matched_entry = NULL;
4249 		s->search_entry = NULL;
4250 		view->offset = 0;
4251 		break;
4252 	case 'R':
4253 		view->count = 0;
4254 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4255 		break;
4256 	default:
4257 		view->count = 0;
4258 		break;
4259 	}
4260 
4261 	return err;
4262 }
4263 
4264 static const struct got_error *
4265 apply_unveil(const char *repo_path, const char *worktree_path)
4266 {
4267 	const struct got_error *error;
4268 
4269 #ifdef PROFILE
4270 	if (unveil("gmon.out", "rwc") != 0)
4271 		return got_error_from_errno2("unveil", "gmon.out");
4272 #endif
4273 	if (repo_path && unveil(repo_path, "r") != 0)
4274 		return got_error_from_errno2("unveil", repo_path);
4275 
4276 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4277 		return got_error_from_errno2("unveil", worktree_path);
4278 
4279 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4280 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4281 
4282 	error = got_privsep_unveil_exec_helpers();
4283 	if (error != NULL)
4284 		return error;
4285 
4286 	if (unveil(NULL, NULL) != 0)
4287 		return got_error_from_errno("unveil");
4288 
4289 	return NULL;
4290 }
4291 
4292 static const struct got_error *
4293 init_mock_term(const char *test_script_path)
4294 {
4295 	const struct got_error	*err = NULL;
4296 	const char *screen_dump_path;
4297 	int in;
4298 
4299 	if (test_script_path == NULL || *test_script_path == '\0')
4300 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4301 
4302 	tog_io.f = fopen(test_script_path, "re");
4303 	if (tog_io.f == NULL) {
4304 		err = got_error_from_errno_fmt("fopen: %s",
4305 		    test_script_path);
4306 		goto done;
4307 	}
4308 
4309 	/* test mode, we don't want any output */
4310 	tog_io.cout = fopen("/dev/null", "w+");
4311 	if (tog_io.cout == NULL) {
4312 		err = got_error_from_errno2("fopen", "/dev/null");
4313 		goto done;
4314 	}
4315 
4316 	in = dup(fileno(tog_io.cout));
4317 	if (in == -1) {
4318 		err = got_error_from_errno("dup");
4319 		goto done;
4320 	}
4321 	tog_io.cin = fdopen(in, "r");
4322 	if (tog_io.cin == NULL) {
4323 		err = got_error_from_errno("fdopen");
4324 		close(in);
4325 		goto done;
4326 	}
4327 
4328 	screen_dump_path = getenv("TOG_SCR_DUMP");
4329 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4330 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4331 	tog_io.sdump = fopen(screen_dump_path, "we");
4332 	if (tog_io.sdump == NULL) {
4333 		err = got_error_from_errno2("fopen", screen_dump_path);
4334 		goto done;
4335 	}
4336 
4337 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4338 		err = got_error_from_errno("fseeko");
4339 		goto done;
4340 	}
4341 
4342 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4343 		err = got_error_msg(GOT_ERR_IO,
4344 		    "newterm: failed to initialise curses");
4345 
4346 	using_mock_io = 1;
4347 
4348 done:
4349 	if (err)
4350 		tog_io_close();
4351 	return err;
4352 }
4353 
4354 static void
4355 init_curses(void)
4356 {
4357 	/*
4358 	 * Override default signal handlers before starting ncurses.
4359 	 * This should prevent ncurses from installing its own
4360 	 * broken cleanup() signal handler.
4361 	 */
4362 	signal(SIGWINCH, tog_sigwinch);
4363 	signal(SIGPIPE, tog_sigpipe);
4364 	signal(SIGCONT, tog_sigcont);
4365 	signal(SIGINT, tog_sigint);
4366 	signal(SIGTERM, tog_sigterm);
4367 
4368 	if (using_mock_io) /* In test mode we use a fake terminal */
4369 		return;
4370 
4371 	initscr();
4372 
4373 	cbreak();
4374 	halfdelay(1); /* Fast refresh while initial view is loading. */
4375 	noecho();
4376 	nonl();
4377 	intrflush(stdscr, FALSE);
4378 	keypad(stdscr, TRUE);
4379 	curs_set(0);
4380 	if (getenv("TOG_COLORS") != NULL) {
4381 		start_color();
4382 		use_default_colors();
4383 	}
4384 
4385 	return;
4386 }
4387 
4388 static const struct got_error *
4389 set_tog_base_commit(struct got_repository *repo, struct got_worktree *worktree)
4390 {
4391 	tog_base_commit.id = got_object_id_dup(
4392 	    got_worktree_get_base_commit_id(worktree));
4393 	if (tog_base_commit.id == NULL)
4394 		return got_error_from_errno( "got_object_id_dup");
4395 
4396 	tog_base_commit.idx = -1;
4397 
4398 	return got_worktree_get_state(&tog_base_commit.marker, repo,
4399 	    worktree);
4400 }
4401 
4402 static const struct got_error *
4403 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4404     struct got_repository *repo, struct got_worktree *worktree)
4405 {
4406 	const struct got_error *err = NULL;
4407 
4408 	if (argc == 0) {
4409 		*in_repo_path = strdup("/");
4410 		if (*in_repo_path == NULL)
4411 			return got_error_from_errno("strdup");
4412 		return NULL;
4413 	}
4414 
4415 	if (worktree) {
4416 		const char *prefix = got_worktree_get_path_prefix(worktree);
4417 		char *p;
4418 
4419 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4420 		if (err)
4421 			return err;
4422 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4423 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4424 		    p) == -1) {
4425 			err = got_error_from_errno("asprintf");
4426 			*in_repo_path = NULL;
4427 		}
4428 		free(p);
4429 	} else
4430 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4431 
4432 	return err;
4433 }
4434 
4435 static const struct got_error *
4436 cmd_log(int argc, char *argv[])
4437 {
4438 	const struct got_error *error;
4439 	struct got_repository *repo = NULL;
4440 	struct got_worktree *worktree = NULL;
4441 	struct got_object_id *start_id = NULL;
4442 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4443 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4444 	struct got_reference *ref = NULL;
4445 	const char *head_ref_name = NULL;
4446 	int ch, log_branches = 0;
4447 	struct tog_view *view;
4448 	int *pack_fds = NULL;
4449 
4450 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4451 		switch (ch) {
4452 		case 'b':
4453 			log_branches = 1;
4454 			break;
4455 		case 'c':
4456 			start_commit = optarg;
4457 			break;
4458 		case 'r':
4459 			repo_path = realpath(optarg, NULL);
4460 			if (repo_path == NULL)
4461 				return got_error_from_errno2("realpath",
4462 				    optarg);
4463 			break;
4464 		default:
4465 			usage_log();
4466 			/* NOTREACHED */
4467 		}
4468 	}
4469 
4470 	argc -= optind;
4471 	argv += optind;
4472 
4473 	if (argc > 1)
4474 		usage_log();
4475 
4476 	error = got_repo_pack_fds_open(&pack_fds);
4477 	if (error != NULL)
4478 		goto done;
4479 
4480 	if (repo_path == NULL) {
4481 		cwd = getcwd(NULL, 0);
4482 		if (cwd == NULL) {
4483 			error = got_error_from_errno("getcwd");
4484 			goto done;
4485 		}
4486 		error = got_worktree_open(&worktree, cwd, NULL);
4487 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4488 			goto done;
4489 		if (worktree)
4490 			repo_path =
4491 			    strdup(got_worktree_get_repo_path(worktree));
4492 		else
4493 			repo_path = strdup(cwd);
4494 		if (repo_path == NULL) {
4495 			error = got_error_from_errno("strdup");
4496 			goto done;
4497 		}
4498 	}
4499 
4500 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4501 	if (error != NULL)
4502 		goto done;
4503 
4504 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4505 	    repo, worktree);
4506 	if (error)
4507 		goto done;
4508 
4509 	init_curses();
4510 
4511 	error = apply_unveil(got_repo_get_path(repo),
4512 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4513 	if (error)
4514 		goto done;
4515 
4516 	/* already loaded by tog_log_with_path()? */
4517 	if (TAILQ_EMPTY(&tog_refs)) {
4518 		error = tog_load_refs(repo, 0);
4519 		if (error)
4520 			goto done;
4521 	}
4522 
4523 	if (start_commit == NULL) {
4524 		error = got_repo_match_object_id(&start_id, &label,
4525 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4526 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4527 		if (error)
4528 			goto done;
4529 		head_ref_name = label;
4530 	} else {
4531 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4532 		    repo, worktree);
4533 		if (error != NULL)
4534 			goto done;
4535 		if (keyword_idstr != NULL)
4536 			start_commit = keyword_idstr;
4537 
4538 		error = got_ref_open(&ref, repo, start_commit, 0);
4539 		if (error == NULL)
4540 			head_ref_name = got_ref_get_name(ref);
4541 		else if (error->code != GOT_ERR_NOT_REF)
4542 			goto done;
4543 		error = got_repo_match_object_id(&start_id, NULL,
4544 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4545 		if (error)
4546 			goto done;
4547 	}
4548 
4549 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4550 	if (view == NULL) {
4551 		error = got_error_from_errno("view_open");
4552 		goto done;
4553 	}
4554 	error = open_log_view(view, start_id, repo, head_ref_name,
4555 	    in_repo_path, log_branches);
4556 	if (error)
4557 		goto done;
4558 
4559 	if (worktree) {
4560 		error = set_tog_base_commit(repo, worktree);
4561 		if (error != NULL)
4562 			goto done;
4563 
4564 		/* Release work tree lock. */
4565 		got_worktree_close(worktree);
4566 		worktree = NULL;
4567 	}
4568 
4569 	error = view_loop(view);
4570 
4571 done:
4572 	free(tog_base_commit.id);
4573 	free(keyword_idstr);
4574 	free(in_repo_path);
4575 	free(repo_path);
4576 	free(cwd);
4577 	free(start_id);
4578 	free(label);
4579 	if (ref)
4580 		got_ref_close(ref);
4581 	if (repo) {
4582 		const struct got_error *close_err = got_repo_close(repo);
4583 		if (error == NULL)
4584 			error = close_err;
4585 	}
4586 	if (worktree)
4587 		got_worktree_close(worktree);
4588 	if (pack_fds) {
4589 		const struct got_error *pack_err =
4590 		    got_repo_pack_fds_close(pack_fds);
4591 		if (error == NULL)
4592 			error = pack_err;
4593 	}
4594 	tog_free_refs();
4595 	return error;
4596 }
4597 
4598 __dead static void
4599 usage_diff(void)
4600 {
4601 	endwin();
4602 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4603 	    "object1 object2\n", getprogname());
4604 	exit(1);
4605 }
4606 
4607 static int
4608 match_line(const char *line, regex_t *regex, size_t nmatch,
4609     regmatch_t *regmatch)
4610 {
4611 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4612 }
4613 
4614 static struct tog_color *
4615 match_color(struct tog_colors *colors, const char *line)
4616 {
4617 	struct tog_color *tc = NULL;
4618 
4619 	STAILQ_FOREACH(tc, colors, entry) {
4620 		if (match_line(line, &tc->regex, 0, NULL))
4621 			return tc;
4622 	}
4623 
4624 	return NULL;
4625 }
4626 
4627 static const struct got_error *
4628 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4629     WINDOW *window, int skipcol, regmatch_t *regmatch)
4630 {
4631 	const struct got_error *err = NULL;
4632 	char *exstr = NULL;
4633 	wchar_t *wline = NULL;
4634 	int rme, rms, n, width, scrollx;
4635 	int width0 = 0, width1 = 0, width2 = 0;
4636 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4637 
4638 	*wtotal = 0;
4639 
4640 	rms = regmatch->rm_so;
4641 	rme = regmatch->rm_eo;
4642 
4643 	err = expand_tab(&exstr, line);
4644 	if (err)
4645 		return err;
4646 
4647 	/* Split the line into 3 segments, according to match offsets. */
4648 	seg0 = strndup(exstr, rms);
4649 	if (seg0 == NULL) {
4650 		err = got_error_from_errno("strndup");
4651 		goto done;
4652 	}
4653 	seg1 = strndup(exstr + rms, rme - rms);
4654 	if (seg1 == NULL) {
4655 		err = got_error_from_errno("strndup");
4656 		goto done;
4657 	}
4658 	seg2 = strdup(exstr + rme);
4659 	if (seg2 == NULL) {
4660 		err = got_error_from_errno("strndup");
4661 		goto done;
4662 	}
4663 
4664 	/* draw up to matched token if we haven't scrolled past it */
4665 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4666 	    col_tab_align, 1);
4667 	if (err)
4668 		goto done;
4669 	n = MAX(width0 - skipcol, 0);
4670 	if (n) {
4671 		free(wline);
4672 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4673 		    wlimit, col_tab_align, 1);
4674 		if (err)
4675 			goto done;
4676 		waddwstr(window, &wline[scrollx]);
4677 		wlimit -= width;
4678 		*wtotal += width;
4679 	}
4680 
4681 	if (wlimit > 0) {
4682 		int i = 0, w = 0;
4683 		size_t wlen;
4684 
4685 		free(wline);
4686 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4687 		    col_tab_align, 1);
4688 		if (err)
4689 			goto done;
4690 		wlen = wcslen(wline);
4691 		while (i < wlen) {
4692 			width = wcwidth(wline[i]);
4693 			if (width == -1) {
4694 				/* should not happen, tabs are expanded */
4695 				err = got_error(GOT_ERR_RANGE);
4696 				goto done;
4697 			}
4698 			if (width0 + w + width > skipcol)
4699 				break;
4700 			w += width;
4701 			i++;
4702 		}
4703 		/* draw (visible part of) matched token (if scrolled into it) */
4704 		if (width1 - w > 0) {
4705 			wattron(window, A_STANDOUT);
4706 			waddwstr(window, &wline[i]);
4707 			wattroff(window, A_STANDOUT);
4708 			wlimit -= (width1 - w);
4709 			*wtotal += (width1 - w);
4710 		}
4711 	}
4712 
4713 	if (wlimit > 0) {  /* draw rest of line */
4714 		free(wline);
4715 		if (skipcol > width0 + width1) {
4716 			err = format_line(&wline, &width2, &scrollx, seg2,
4717 			    skipcol - (width0 + width1), wlimit,
4718 			    col_tab_align, 1);
4719 			if (err)
4720 				goto done;
4721 			waddwstr(window, &wline[scrollx]);
4722 		} else {
4723 			err = format_line(&wline, &width2, NULL, seg2, 0,
4724 			    wlimit, col_tab_align, 1);
4725 			if (err)
4726 				goto done;
4727 			waddwstr(window, wline);
4728 		}
4729 		*wtotal += width2;
4730 	}
4731 done:
4732 	free(wline);
4733 	free(exstr);
4734 	free(seg0);
4735 	free(seg1);
4736 	free(seg2);
4737 	return err;
4738 }
4739 
4740 static int
4741 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4742 {
4743 	FILE	*f = NULL;
4744 	int	*eof, *first, *selected;
4745 
4746 	if (view->type == TOG_VIEW_DIFF) {
4747 		struct tog_diff_view_state *s = &view->state.diff;
4748 
4749 		first = &s->first_displayed_line;
4750 		selected = first;
4751 		eof = &s->eof;
4752 		f = s->f;
4753 	} else if (view->type == TOG_VIEW_HELP) {
4754 		struct tog_help_view_state *s = &view->state.help;
4755 
4756 		first = &s->first_displayed_line;
4757 		selected = first;
4758 		eof = &s->eof;
4759 		f = s->f;
4760 	} else if (view->type == TOG_VIEW_BLAME) {
4761 		struct tog_blame_view_state *s = &view->state.blame;
4762 
4763 		first = &s->first_displayed_line;
4764 		selected = &s->selected_line;
4765 		eof = &s->eof;
4766 		f = s->blame.f;
4767 	} else
4768 		return 0;
4769 
4770 	/* Center gline in the middle of the page like vi(1). */
4771 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4772 		return 0;
4773 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4774 		rewind(f);
4775 		*eof = 0;
4776 		*first = 1;
4777 		*lineno = 0;
4778 		*nprinted = 0;
4779 		return 0;
4780 	}
4781 
4782 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4783 		view->gline : (view->nlines - 3) / 2 + 1;
4784 	view->gline = 0;
4785 
4786 	return 1;
4787 }
4788 
4789 static const struct got_error *
4790 draw_file(struct tog_view *view, const char *header)
4791 {
4792 	struct tog_diff_view_state *s = &view->state.diff;
4793 	regmatch_t *regmatch = &view->regmatch;
4794 	const struct got_error *err;
4795 	int nprinted = 0;
4796 	char *line;
4797 	size_t linesize = 0;
4798 	ssize_t linelen;
4799 	wchar_t *wline;
4800 	int width;
4801 	int max_lines = view->nlines;
4802 	int nlines = s->nlines;
4803 	off_t line_offset;
4804 
4805 	s->lineno = s->first_displayed_line - 1;
4806 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4807 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4808 		return got_error_from_errno("fseek");
4809 
4810 	werase(view->window);
4811 
4812 	if (view->gline > s->nlines - 1)
4813 		view->gline = s->nlines - 1;
4814 
4815 	if (header) {
4816 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4817 		    1 : view->gline - (view->nlines - 3) / 2 :
4818 		    s->lineno + s->selected_line;
4819 
4820 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4821 			return got_error_from_errno("asprintf");
4822 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4823 		    0, 0);
4824 		free(line);
4825 		if (err)
4826 			return err;
4827 
4828 		if (view_needs_focus_indication(view))
4829 			wstandout(view->window);
4830 		waddwstr(view->window, wline);
4831 		free(wline);
4832 		wline = NULL;
4833 		while (width++ < view->ncols)
4834 			waddch(view->window, ' ');
4835 		if (view_needs_focus_indication(view))
4836 			wstandend(view->window);
4837 
4838 		if (max_lines <= 1)
4839 			return NULL;
4840 		max_lines--;
4841 	}
4842 
4843 	s->eof = 0;
4844 	view->maxx = 0;
4845 	line = NULL;
4846 	while (max_lines > 0 && nprinted < max_lines) {
4847 		enum got_diff_line_type linetype;
4848 		attr_t attr = 0;
4849 
4850 		linelen = getline(&line, &linesize, s->f);
4851 		if (linelen == -1) {
4852 			if (feof(s->f)) {
4853 				s->eof = 1;
4854 				break;
4855 			}
4856 			free(line);
4857 			return got_ferror(s->f, GOT_ERR_IO);
4858 		}
4859 
4860 		if (++s->lineno < s->first_displayed_line)
4861 			continue;
4862 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4863 			continue;
4864 		if (s->lineno == view->hiline)
4865 			attr = A_STANDOUT;
4866 
4867 		/* Set view->maxx based on full line length. */
4868 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4869 		    view->x ? 1 : 0);
4870 		if (err) {
4871 			free(line);
4872 			return err;
4873 		}
4874 		view->maxx = MAX(view->maxx, width);
4875 		free(wline);
4876 		wline = NULL;
4877 
4878 		linetype = s->lines[s->lineno].type;
4879 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4880 		    linetype < GOT_DIFF_LINE_CONTEXT)
4881 			attr |= COLOR_PAIR(linetype);
4882 		if (attr)
4883 			wattron(view->window, attr);
4884 		if (s->first_displayed_line + nprinted == s->matched_line &&
4885 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4886 			err = add_matched_line(&width, line, view->ncols, 0,
4887 			    view->window, view->x, regmatch);
4888 			if (err) {
4889 				free(line);
4890 				return err;
4891 			}
4892 		} else {
4893 			int skip;
4894 			err = format_line(&wline, &width, &skip, line,
4895 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4896 			if (err) {
4897 				free(line);
4898 				return err;
4899 			}
4900 			waddwstr(view->window, &wline[skip]);
4901 			free(wline);
4902 			wline = NULL;
4903 		}
4904 		if (s->lineno == view->hiline) {
4905 			/* highlight full gline length */
4906 			while (width++ < view->ncols)
4907 				waddch(view->window, ' ');
4908 		} else {
4909 			if (width <= view->ncols - 1)
4910 				waddch(view->window, '\n');
4911 		}
4912 		if (attr)
4913 			wattroff(view->window, attr);
4914 		if (++nprinted == 1)
4915 			s->first_displayed_line = s->lineno;
4916 	}
4917 	free(line);
4918 	if (nprinted >= 1)
4919 		s->last_displayed_line = s->first_displayed_line +
4920 		    (nprinted - 1);
4921 	else
4922 		s->last_displayed_line = s->first_displayed_line;
4923 
4924 	view_border(view);
4925 
4926 	if (s->eof) {
4927 		while (nprinted < view->nlines) {
4928 			waddch(view->window, '\n');
4929 			nprinted++;
4930 		}
4931 
4932 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4933 		    view->ncols, 0, 0);
4934 		if (err) {
4935 			return err;
4936 		}
4937 
4938 		wstandout(view->window);
4939 		waddwstr(view->window, wline);
4940 		free(wline);
4941 		wline = NULL;
4942 		wstandend(view->window);
4943 	}
4944 
4945 	return NULL;
4946 }
4947 
4948 static char *
4949 get_datestr(time_t *time, char *datebuf)
4950 {
4951 	struct tm mytm, *tm;
4952 	char *p, *s;
4953 
4954 	tm = gmtime_r(time, &mytm);
4955 	if (tm == NULL)
4956 		return NULL;
4957 	s = asctime_r(tm, datebuf);
4958 	if (s == NULL)
4959 		return NULL;
4960 	p = strchr(s, '\n');
4961 	if (p)
4962 		*p = '\0';
4963 	return s;
4964 }
4965 
4966 static const struct got_error *
4967 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4968     off_t off, uint8_t type)
4969 {
4970 	struct got_diff_line *p;
4971 
4972 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4973 	if (p == NULL)
4974 		return got_error_from_errno("reallocarray");
4975 	*lines = p;
4976 	(*lines)[*nlines].offset = off;
4977 	(*lines)[*nlines].type = type;
4978 	(*nlines)++;
4979 
4980 	return NULL;
4981 }
4982 
4983 static const struct got_error *
4984 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4985     struct got_diff_line *s_lines, size_t s_nlines)
4986 {
4987 	struct got_diff_line	*p;
4988 	char			 buf[BUFSIZ];
4989 	size_t			 i, r;
4990 
4991 	if (fseeko(src, 0L, SEEK_SET) == -1)
4992 		return got_error_from_errno("fseeko");
4993 
4994 	for (;;) {
4995 		r = fread(buf, 1, sizeof(buf), src);
4996 		if (r == 0) {
4997 			if (ferror(src))
4998 				return got_error_from_errno("fread");
4999 			if (feof(src))
5000 				break;
5001 		}
5002 		if (fwrite(buf, 1, r, dst) != r)
5003 			return got_ferror(dst, GOT_ERR_IO);
5004 	}
5005 
5006 	if (s_nlines == 0 && *d_nlines == 0)
5007 		return NULL;
5008 
5009 	/*
5010 	 * If commit info was in dst, increment line offsets
5011 	 * of the appended diff content, but skip s_lines[0]
5012 	 * because offset zero is already in *d_lines.
5013 	 */
5014 	if (*d_nlines > 0) {
5015 		for (i = 1; i < s_nlines; ++i)
5016 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
5017 
5018 		if (s_nlines > 0) {
5019 			--s_nlines;
5020 			++s_lines;
5021 		}
5022 	}
5023 
5024 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
5025 	if (p == NULL) {
5026 		/* d_lines is freed in close_diff_view() */
5027 		return got_error_from_errno("reallocarray");
5028 	}
5029 
5030 	*d_lines = p;
5031 
5032 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
5033 	*d_nlines += s_nlines;
5034 
5035 	return NULL;
5036 }
5037 
5038 static const struct got_error *
5039 write_commit_info(struct got_diff_line **lines, size_t *nlines,
5040     struct got_object_id *commit_id, struct got_reflist_head *refs,
5041     struct got_repository *repo, int ignore_ws, int force_text_diff,
5042     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5043 {
5044 	const struct got_error *err = NULL;
5045 	char datebuf[26], *datestr;
5046 	struct got_commit_object *commit;
5047 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5048 	time_t committer_time;
5049 	const char *author, *committer;
5050 	char *refs_str = NULL;
5051 	struct got_pathlist_entry *pe;
5052 	off_t outoff = 0;
5053 	int n;
5054 
5055 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5056 	if (err)
5057 		return err;
5058 
5059 	err = got_object_open_as_commit(&commit, repo, commit_id);
5060 	if (err)
5061 		return err;
5062 
5063 	err = got_object_id_str(&id_str, commit_id);
5064 	if (err) {
5065 		err = got_error_from_errno("got_object_id_str");
5066 		goto done;
5067 	}
5068 
5069 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5070 	if (err)
5071 		goto done;
5072 
5073 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5074 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5075 	if (n < 0) {
5076 		err = got_error_from_errno("fprintf");
5077 		goto done;
5078 	}
5079 	outoff += n;
5080 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5081 	if (err)
5082 		goto done;
5083 
5084 	n = fprintf(outfile, "from: %s\n",
5085 	    got_object_commit_get_author(commit));
5086 	if (n < 0) {
5087 		err = got_error_from_errno("fprintf");
5088 		goto done;
5089 	}
5090 	outoff += n;
5091 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5092 	if (err)
5093 		goto done;
5094 
5095 	author = got_object_commit_get_author(commit);
5096 	committer = got_object_commit_get_committer(commit);
5097 	if (strcmp(author, committer) != 0) {
5098 		n = fprintf(outfile, "via: %s\n", committer);
5099 		if (n < 0) {
5100 			err = got_error_from_errno("fprintf");
5101 			goto done;
5102 		}
5103 		outoff += n;
5104 		err = add_line_metadata(lines, nlines, outoff,
5105 		    GOT_DIFF_LINE_AUTHOR);
5106 		if (err)
5107 			goto done;
5108 	}
5109 	committer_time = got_object_commit_get_committer_time(commit);
5110 	datestr = get_datestr(&committer_time, datebuf);
5111 	if (datestr) {
5112 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5113 		if (n < 0) {
5114 			err = got_error_from_errno("fprintf");
5115 			goto done;
5116 		}
5117 		outoff += n;
5118 		err = add_line_metadata(lines, nlines, outoff,
5119 		    GOT_DIFF_LINE_DATE);
5120 		if (err)
5121 			goto done;
5122 	}
5123 	if (got_object_commit_get_nparents(commit) > 1) {
5124 		const struct got_object_id_queue *parent_ids;
5125 		struct got_object_qid *qid;
5126 		int pn = 1;
5127 		parent_ids = got_object_commit_get_parent_ids(commit);
5128 		STAILQ_FOREACH(qid, parent_ids, entry) {
5129 			err = got_object_id_str(&id_str, &qid->id);
5130 			if (err)
5131 				goto done;
5132 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5133 			if (n < 0) {
5134 				err = got_error_from_errno("fprintf");
5135 				goto done;
5136 			}
5137 			outoff += n;
5138 			err = add_line_metadata(lines, nlines, outoff,
5139 			    GOT_DIFF_LINE_META);
5140 			if (err)
5141 				goto done;
5142 			free(id_str);
5143 			id_str = NULL;
5144 		}
5145 	}
5146 
5147 	err = got_object_commit_get_logmsg(&logmsg, commit);
5148 	if (err)
5149 		goto done;
5150 	s = logmsg;
5151 	while ((line = strsep(&s, "\n")) != NULL) {
5152 		n = fprintf(outfile, "%s\n", line);
5153 		if (n < 0) {
5154 			err = got_error_from_errno("fprintf");
5155 			goto done;
5156 		}
5157 		outoff += n;
5158 		err = add_line_metadata(lines, nlines, outoff,
5159 		    GOT_DIFF_LINE_LOGMSG);
5160 		if (err)
5161 			goto done;
5162 	}
5163 
5164 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5165 		struct got_diff_changed_path *cp = pe->data;
5166 		int pad = dsa->max_path_len - pe->path_len + 1;
5167 
5168 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5169 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5170 		    dsa->rm_cols + 1, cp->rm);
5171 		if (n < 0) {
5172 			err = got_error_from_errno("fprintf");
5173 			goto done;
5174 		}
5175 		outoff += n;
5176 		err = add_line_metadata(lines, nlines, outoff,
5177 		    GOT_DIFF_LINE_CHANGES);
5178 		if (err)
5179 			goto done;
5180 	}
5181 
5182 	fputc('\n', outfile);
5183 	outoff++;
5184 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5185 	if (err)
5186 		goto done;
5187 
5188 	n = fprintf(outfile,
5189 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5190 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5191 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5192 	if (n < 0) {
5193 		err = got_error_from_errno("fprintf");
5194 		goto done;
5195 	}
5196 	outoff += n;
5197 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5198 	if (err)
5199 		goto done;
5200 
5201 	fputc('\n', outfile);
5202 	outoff++;
5203 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5204 done:
5205 	free(id_str);
5206 	free(logmsg);
5207 	free(refs_str);
5208 	got_object_commit_close(commit);
5209 	if (err) {
5210 		free(*lines);
5211 		*lines = NULL;
5212 		*nlines = 0;
5213 	}
5214 	return err;
5215 }
5216 
5217 static const struct got_error *
5218 create_diff(struct tog_diff_view_state *s)
5219 {
5220 	const struct got_error *err = NULL;
5221 	FILE *f = NULL, *tmp_diff_file = NULL;
5222 	int obj_type;
5223 	struct got_diff_line *lines = NULL;
5224 	struct got_pathlist_head changed_paths;
5225 
5226 	TAILQ_INIT(&changed_paths);
5227 
5228 	free(s->lines);
5229 	s->lines = malloc(sizeof(*s->lines));
5230 	if (s->lines == NULL)
5231 		return got_error_from_errno("malloc");
5232 	s->nlines = 0;
5233 
5234 	f = got_opentemp();
5235 	if (f == NULL) {
5236 		err = got_error_from_errno("got_opentemp");
5237 		goto done;
5238 	}
5239 	tmp_diff_file = got_opentemp();
5240 	if (tmp_diff_file == NULL) {
5241 		err = got_error_from_errno("got_opentemp");
5242 		goto done;
5243 	}
5244 	if (s->f && fclose(s->f) == EOF) {
5245 		err = got_error_from_errno("fclose");
5246 		goto done;
5247 	}
5248 	s->f = f;
5249 
5250 	if (s->id1)
5251 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5252 	else
5253 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5254 	if (err)
5255 		goto done;
5256 
5257 	switch (obj_type) {
5258 	case GOT_OBJ_TYPE_BLOB:
5259 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5260 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5261 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5262 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5263 		    s->f);
5264 		break;
5265 	case GOT_OBJ_TYPE_TREE:
5266 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5267 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5268 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5269 		    s->force_text_diff, NULL, s->repo, s->f);
5270 		break;
5271 	case GOT_OBJ_TYPE_COMMIT: {
5272 		const struct got_object_id_queue *parent_ids;
5273 		struct got_object_qid *pid;
5274 		struct got_commit_object *commit2;
5275 		struct got_reflist_head *refs;
5276 		size_t nlines = 0;
5277 		struct got_diffstat_cb_arg dsa = {
5278 			0, 0, 0, 0, 0, 0,
5279 			&changed_paths,
5280 			s->ignore_whitespace,
5281 			s->force_text_diff,
5282 			tog_diff_algo
5283 		};
5284 
5285 		lines = malloc(sizeof(*lines));
5286 		if (lines == NULL) {
5287 			err = got_error_from_errno("malloc");
5288 			goto done;
5289 		}
5290 
5291 		/* build diff first in tmp file then append to commit info */
5292 		err = got_diff_objects_as_commits(&lines, &nlines,
5293 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5294 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5295 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5296 		if (err)
5297 			break;
5298 
5299 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5300 		if (err)
5301 			goto done;
5302 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5303 		/* Show commit info if we're diffing to a parent/root commit. */
5304 		if (s->id1 == NULL) {
5305 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5306 			    refs, s->repo, s->ignore_whitespace,
5307 			    s->force_text_diff, &dsa, s->f);
5308 			if (err)
5309 				goto done;
5310 		} else {
5311 			parent_ids = got_object_commit_get_parent_ids(commit2);
5312 			STAILQ_FOREACH(pid, parent_ids, entry) {
5313 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5314 					err = write_commit_info(&s->lines,
5315 					    &s->nlines, s->id2, refs, s->repo,
5316 					    s->ignore_whitespace,
5317 					    s->force_text_diff, &dsa, s->f);
5318 					if (err)
5319 						goto done;
5320 					break;
5321 				}
5322 			}
5323 		}
5324 		got_object_commit_close(commit2);
5325 
5326 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5327 		    lines, nlines);
5328 		break;
5329 	}
5330 	default:
5331 		err = got_error(GOT_ERR_OBJ_TYPE);
5332 		break;
5333 	}
5334 done:
5335 	free(lines);
5336 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5337 	if (s->f && fflush(s->f) != 0 && err == NULL)
5338 		err = got_error_from_errno("fflush");
5339 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5340 		err = got_error_from_errno("fclose");
5341 	return err;
5342 }
5343 
5344 static void
5345 diff_view_indicate_progress(struct tog_view *view)
5346 {
5347 	mvwaddstr(view->window, 0, 0, "diffing...");
5348 	update_panels();
5349 	doupdate();
5350 }
5351 
5352 static const struct got_error *
5353 search_start_diff_view(struct tog_view *view)
5354 {
5355 	struct tog_diff_view_state *s = &view->state.diff;
5356 
5357 	s->matched_line = 0;
5358 	return NULL;
5359 }
5360 
5361 static void
5362 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5363     size_t *nlines, int **first, int **last, int **match, int **selected)
5364 {
5365 	struct tog_diff_view_state *s = &view->state.diff;
5366 
5367 	*f = s->f;
5368 	*nlines = s->nlines;
5369 	*line_offsets = NULL;
5370 	*match = &s->matched_line;
5371 	*first = &s->first_displayed_line;
5372 	*last = &s->last_displayed_line;
5373 	*selected = &s->selected_line;
5374 }
5375 
5376 static const struct got_error *
5377 search_next_view_match(struct tog_view *view)
5378 {
5379 	const struct got_error *err = NULL;
5380 	FILE *f;
5381 	int lineno;
5382 	char *line = NULL;
5383 	size_t linesize = 0;
5384 	ssize_t linelen;
5385 	off_t *line_offsets;
5386 	size_t nlines = 0;
5387 	int *first, *last, *match, *selected;
5388 
5389 	if (!view->search_setup)
5390 		return got_error_msg(GOT_ERR_NOT_IMPL,
5391 		    "view search not supported");
5392 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5393 	    &match, &selected);
5394 
5395 	if (!view->searching) {
5396 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5397 		return NULL;
5398 	}
5399 
5400 	if (*match) {
5401 		if (view->searching == TOG_SEARCH_FORWARD)
5402 			lineno = *first + 1;
5403 		else
5404 			lineno = *first - 1;
5405 	} else
5406 		lineno = *first - 1 + *selected;
5407 
5408 	while (1) {
5409 		off_t offset;
5410 
5411 		if (lineno <= 0 || lineno > nlines) {
5412 			if (*match == 0) {
5413 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5414 				break;
5415 			}
5416 
5417 			if (view->searching == TOG_SEARCH_FORWARD)
5418 				lineno = 1;
5419 			else
5420 				lineno = nlines;
5421 		}
5422 
5423 		offset = view->type == TOG_VIEW_DIFF ?
5424 		    view->state.diff.lines[lineno - 1].offset :
5425 		    line_offsets[lineno - 1];
5426 		if (fseeko(f, offset, SEEK_SET) != 0) {
5427 			free(line);
5428 			return got_error_from_errno("fseeko");
5429 		}
5430 		linelen = getline(&line, &linesize, f);
5431 		if (linelen != -1) {
5432 			char *exstr;
5433 			err = expand_tab(&exstr, line);
5434 			if (err)
5435 				break;
5436 			if (match_line(exstr, &view->regex, 1,
5437 			    &view->regmatch)) {
5438 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5439 				*match = lineno;
5440 				free(exstr);
5441 				break;
5442 			}
5443 			free(exstr);
5444 		}
5445 		if (view->searching == TOG_SEARCH_FORWARD)
5446 			lineno++;
5447 		else
5448 			lineno--;
5449 	}
5450 	free(line);
5451 
5452 	if (*match) {
5453 		*first = *match;
5454 		*selected = 1;
5455 	}
5456 
5457 	return err;
5458 }
5459 
5460 static const struct got_error *
5461 close_diff_view(struct tog_view *view)
5462 {
5463 	const struct got_error *err = NULL;
5464 	struct tog_diff_view_state *s = &view->state.diff;
5465 
5466 	free(s->id1);
5467 	s->id1 = NULL;
5468 	free(s->id2);
5469 	s->id2 = NULL;
5470 	if (s->f && fclose(s->f) == EOF)
5471 		err = got_error_from_errno("fclose");
5472 	s->f = NULL;
5473 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5474 		err = got_error_from_errno("fclose");
5475 	s->f1 = NULL;
5476 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5477 		err = got_error_from_errno("fclose");
5478 	s->f2 = NULL;
5479 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5480 		err = got_error_from_errno("close");
5481 	s->fd1 = -1;
5482 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5483 		err = got_error_from_errno("close");
5484 	s->fd2 = -1;
5485 	free(s->lines);
5486 	s->lines = NULL;
5487 	s->nlines = 0;
5488 	return err;
5489 }
5490 
5491 static const struct got_error *
5492 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5493     struct got_object_id *id2, const char *label1, const char *label2,
5494     int diff_context, int ignore_whitespace, int force_text_diff,
5495     struct tog_view *parent_view, struct got_repository *repo)
5496 {
5497 	const struct got_error *err;
5498 	struct tog_diff_view_state *s = &view->state.diff;
5499 
5500 	memset(s, 0, sizeof(*s));
5501 	s->fd1 = -1;
5502 	s->fd2 = -1;
5503 
5504 	if (id1 != NULL && id2 != NULL) {
5505 		int type1, type2;
5506 
5507 		err = got_object_get_type(&type1, repo, id1);
5508 		if (err)
5509 			goto done;
5510 		err = got_object_get_type(&type2, repo, id2);
5511 		if (err)
5512 			goto done;
5513 
5514 		if (type1 != type2) {
5515 			err = got_error(GOT_ERR_OBJ_TYPE);
5516 			goto done;
5517 		}
5518 	}
5519 	s->first_displayed_line = 1;
5520 	s->last_displayed_line = view->nlines;
5521 	s->selected_line = 1;
5522 	s->repo = repo;
5523 	s->id1 = id1;
5524 	s->id2 = id2;
5525 	s->label1 = label1;
5526 	s->label2 = label2;
5527 
5528 	if (id1) {
5529 		s->id1 = got_object_id_dup(id1);
5530 		if (s->id1 == NULL) {
5531 			err = got_error_from_errno("got_object_id_dup");
5532 			goto done;
5533 		}
5534 	} else
5535 		s->id1 = NULL;
5536 
5537 	s->id2 = got_object_id_dup(id2);
5538 	if (s->id2 == NULL) {
5539 		err = got_error_from_errno("got_object_id_dup");
5540 		goto done;
5541 	}
5542 
5543 	s->f1 = got_opentemp();
5544 	if (s->f1 == NULL) {
5545 		err = got_error_from_errno("got_opentemp");
5546 		goto done;
5547 	}
5548 
5549 	s->f2 = got_opentemp();
5550 	if (s->f2 == NULL) {
5551 		err = got_error_from_errno("got_opentemp");
5552 		goto done;
5553 	}
5554 
5555 	s->fd1 = got_opentempfd();
5556 	if (s->fd1 == -1) {
5557 		err = got_error_from_errno("got_opentempfd");
5558 		goto done;
5559 	}
5560 
5561 	s->fd2 = got_opentempfd();
5562 	if (s->fd2 == -1) {
5563 		err = got_error_from_errno("got_opentempfd");
5564 		goto done;
5565 	}
5566 
5567 	s->diff_context = diff_context;
5568 	s->ignore_whitespace = ignore_whitespace;
5569 	s->force_text_diff = force_text_diff;
5570 	s->parent_view = parent_view;
5571 	s->repo = repo;
5572 
5573 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5574 		int rc;
5575 
5576 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5577 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5578 		if (rc != ERR)
5579 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5580 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5581 		if (rc != ERR)
5582 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5583 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5584 		if (rc != ERR)
5585 			rc = init_pair(GOT_DIFF_LINE_META,
5586 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5587 		if (rc != ERR)
5588 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5589 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5590 		if (rc != ERR)
5591 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5592 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5593 		if (rc != ERR)
5594 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5595 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5596 		if (rc != ERR)
5597 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5598 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5599 		if (rc != ERR)
5600 			rc = init_pair(GOT_DIFF_LINE_DATE,
5601 			    get_color_value("TOG_COLOR_DATE"), -1);
5602 		if (rc == ERR) {
5603 			err = got_error(GOT_ERR_RANGE);
5604 			goto done;
5605 		}
5606 	}
5607 
5608 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5609 	    view_is_splitscreen(view))
5610 		show_log_view(parent_view); /* draw border */
5611 	diff_view_indicate_progress(view);
5612 
5613 	err = create_diff(s);
5614 
5615 	view->show = show_diff_view;
5616 	view->input = input_diff_view;
5617 	view->reset = reset_diff_view;
5618 	view->close = close_diff_view;
5619 	view->search_start = search_start_diff_view;
5620 	view->search_setup = search_setup_diff_view;
5621 	view->search_next = search_next_view_match;
5622 done:
5623 	if (err) {
5624 		if (view->close == NULL)
5625 			close_diff_view(view);
5626 		view_close(view);
5627 	}
5628 	return err;
5629 }
5630 
5631 static const struct got_error *
5632 show_diff_view(struct tog_view *view)
5633 {
5634 	const struct got_error *err;
5635 	struct tog_diff_view_state *s = &view->state.diff;
5636 	char *id_str1 = NULL, *id_str2, *header;
5637 	const char *label1, *label2;
5638 
5639 	if (s->id1) {
5640 		err = got_object_id_str(&id_str1, s->id1);
5641 		if (err)
5642 			return err;
5643 		label1 = s->label1 ? s->label1 : id_str1;
5644 	} else
5645 		label1 = "/dev/null";
5646 
5647 	err = got_object_id_str(&id_str2, s->id2);
5648 	if (err)
5649 		return err;
5650 	label2 = s->label2 ? s->label2 : id_str2;
5651 
5652 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5653 		err = got_error_from_errno("asprintf");
5654 		free(id_str1);
5655 		free(id_str2);
5656 		return err;
5657 	}
5658 	free(id_str1);
5659 	free(id_str2);
5660 
5661 	err = draw_file(view, header);
5662 	free(header);
5663 	return err;
5664 }
5665 
5666 static const struct got_error *
5667 set_selected_commit(struct tog_diff_view_state *s,
5668     struct commit_queue_entry *entry)
5669 {
5670 	const struct got_error *err;
5671 	const struct got_object_id_queue *parent_ids;
5672 	struct got_commit_object *selected_commit;
5673 	struct got_object_qid *pid;
5674 
5675 	free(s->id2);
5676 	s->id2 = got_object_id_dup(entry->id);
5677 	if (s->id2 == NULL)
5678 		return got_error_from_errno("got_object_id_dup");
5679 
5680 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5681 	if (err)
5682 		return err;
5683 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5684 	free(s->id1);
5685 	pid = STAILQ_FIRST(parent_ids);
5686 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5687 	got_object_commit_close(selected_commit);
5688 	return NULL;
5689 }
5690 
5691 static const struct got_error *
5692 reset_diff_view(struct tog_view *view)
5693 {
5694 	struct tog_diff_view_state *s = &view->state.diff;
5695 
5696 	view->count = 0;
5697 	wclear(view->window);
5698 	s->first_displayed_line = 1;
5699 	s->last_displayed_line = view->nlines;
5700 	s->matched_line = 0;
5701 	diff_view_indicate_progress(view);
5702 	return create_diff(s);
5703 }
5704 
5705 static void
5706 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5707 {
5708 	int start, i;
5709 
5710 	i = start = s->first_displayed_line - 1;
5711 
5712 	while (s->lines[i].type != type) {
5713 		if (i == 0)
5714 			i = s->nlines - 1;
5715 		if (--i == start)
5716 			return; /* do nothing, requested type not in file */
5717 	}
5718 
5719 	s->selected_line = 1;
5720 	s->first_displayed_line = i;
5721 }
5722 
5723 static void
5724 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5725 {
5726 	int start, i;
5727 
5728 	i = start = s->first_displayed_line + 1;
5729 
5730 	while (s->lines[i].type != type) {
5731 		if (i == s->nlines - 1)
5732 			i = 0;
5733 		if (++i == start)
5734 			return; /* do nothing, requested type not in file */
5735 	}
5736 
5737 	s->selected_line = 1;
5738 	s->first_displayed_line = i;
5739 }
5740 
5741 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5742     int, int, int);
5743 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5744     int, int);
5745 
5746 static const struct got_error *
5747 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5748 {
5749 	const struct got_error *err = NULL;
5750 	struct tog_diff_view_state *s = &view->state.diff;
5751 	struct tog_log_view_state *ls;
5752 	struct commit_queue_entry *old_selected_entry;
5753 	char *line = NULL;
5754 	size_t linesize = 0;
5755 	ssize_t linelen;
5756 	int i, nscroll = view->nlines - 1, up = 0;
5757 
5758 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5759 
5760 	switch (ch) {
5761 	case '0':
5762 	case '$':
5763 	case KEY_RIGHT:
5764 	case 'l':
5765 	case KEY_LEFT:
5766 	case 'h':
5767 		horizontal_scroll_input(view, ch);
5768 		break;
5769 	case 'a':
5770 	case 'w':
5771 		if (ch == 'a') {
5772 			s->force_text_diff = !s->force_text_diff;
5773 			view->action = s->force_text_diff ?
5774 			    "force ASCII text enabled" :
5775 			    "force ASCII text disabled";
5776 		}
5777 		else if (ch == 'w') {
5778 			s->ignore_whitespace = !s->ignore_whitespace;
5779 			view->action = s->ignore_whitespace ?
5780 			    "ignore whitespace enabled" :
5781 			    "ignore whitespace disabled";
5782 		}
5783 		err = reset_diff_view(view);
5784 		break;
5785 	case 'g':
5786 	case KEY_HOME:
5787 		s->first_displayed_line = 1;
5788 		view->count = 0;
5789 		break;
5790 	case 'G':
5791 	case KEY_END:
5792 		view->count = 0;
5793 		if (s->eof)
5794 			break;
5795 
5796 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5797 		s->eof = 1;
5798 		break;
5799 	case 'k':
5800 	case KEY_UP:
5801 	case CTRL('p'):
5802 		if (s->first_displayed_line > 1)
5803 			s->first_displayed_line--;
5804 		else
5805 			view->count = 0;
5806 		break;
5807 	case CTRL('u'):
5808 	case 'u':
5809 		nscroll /= 2;
5810 		/* FALL THROUGH */
5811 	case KEY_PPAGE:
5812 	case CTRL('b'):
5813 	case 'b':
5814 		if (s->first_displayed_line == 1) {
5815 			view->count = 0;
5816 			break;
5817 		}
5818 		i = 0;
5819 		while (i++ < nscroll && s->first_displayed_line > 1)
5820 			s->first_displayed_line--;
5821 		break;
5822 	case 'j':
5823 	case KEY_DOWN:
5824 	case CTRL('n'):
5825 		if (!s->eof)
5826 			s->first_displayed_line++;
5827 		else
5828 			view->count = 0;
5829 		break;
5830 	case CTRL('d'):
5831 	case 'd':
5832 		nscroll /= 2;
5833 		/* FALL THROUGH */
5834 	case KEY_NPAGE:
5835 	case CTRL('f'):
5836 	case 'f':
5837 	case ' ':
5838 		if (s->eof) {
5839 			view->count = 0;
5840 			break;
5841 		}
5842 		i = 0;
5843 		while (!s->eof && i++ < nscroll) {
5844 			linelen = getline(&line, &linesize, s->f);
5845 			s->first_displayed_line++;
5846 			if (linelen == -1) {
5847 				if (feof(s->f)) {
5848 					s->eof = 1;
5849 				} else
5850 					err = got_ferror(s->f, GOT_ERR_IO);
5851 				break;
5852 			}
5853 		}
5854 		free(line);
5855 		break;
5856 	case '(':
5857 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5858 		break;
5859 	case ')':
5860 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5861 		break;
5862 	case '{':
5863 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5864 		break;
5865 	case '}':
5866 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5867 		break;
5868 	case '[':
5869 		if (s->diff_context > 0) {
5870 			s->diff_context--;
5871 			s->matched_line = 0;
5872 			diff_view_indicate_progress(view);
5873 			err = create_diff(s);
5874 			if (s->first_displayed_line + view->nlines - 1 >
5875 			    s->nlines) {
5876 				s->first_displayed_line = 1;
5877 				s->last_displayed_line = view->nlines;
5878 			}
5879 		} else
5880 			view->count = 0;
5881 		break;
5882 	case ']':
5883 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5884 			s->diff_context++;
5885 			s->matched_line = 0;
5886 			diff_view_indicate_progress(view);
5887 			err = create_diff(s);
5888 		} else
5889 			view->count = 0;
5890 		break;
5891 	case '<':
5892 	case ',':
5893 	case 'K':
5894 		up = 1;
5895 		/* FALL THROUGH */
5896 	case '>':
5897 	case '.':
5898 	case 'J':
5899 		if (s->parent_view == NULL) {
5900 			view->count = 0;
5901 			break;
5902 		}
5903 		s->parent_view->count = view->count;
5904 
5905 		if (s->parent_view->type == TOG_VIEW_LOG) {
5906 			ls = &s->parent_view->state.log;
5907 			old_selected_entry = ls->selected_entry;
5908 
5909 			err = input_log_view(NULL, s->parent_view,
5910 			    up ? KEY_UP : KEY_DOWN);
5911 			if (err)
5912 				break;
5913 			view->count = s->parent_view->count;
5914 
5915 			if (old_selected_entry == ls->selected_entry)
5916 				break;
5917 
5918 			err = set_selected_commit(s, ls->selected_entry);
5919 			if (err)
5920 				break;
5921 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5922 			struct tog_blame_view_state *bs;
5923 			struct got_object_id *id, *prev_id;
5924 
5925 			bs = &s->parent_view->state.blame;
5926 			prev_id = get_annotation_for_line(bs->blame.lines,
5927 			    bs->blame.nlines, bs->last_diffed_line);
5928 
5929 			err = input_blame_view(&view, s->parent_view,
5930 			    up ? KEY_UP : KEY_DOWN);
5931 			if (err)
5932 				break;
5933 			view->count = s->parent_view->count;
5934 
5935 			if (prev_id == NULL)
5936 				break;
5937 			id = get_selected_commit_id(bs->blame.lines,
5938 			    bs->blame.nlines, bs->first_displayed_line,
5939 			    bs->selected_line);
5940 			if (id == NULL)
5941 				break;
5942 
5943 			if (!got_object_id_cmp(prev_id, id))
5944 				break;
5945 
5946 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5947 			if (err)
5948 				break;
5949 		}
5950 		s->first_displayed_line = 1;
5951 		s->last_displayed_line = view->nlines;
5952 		s->matched_line = 0;
5953 		view->x = 0;
5954 
5955 		diff_view_indicate_progress(view);
5956 		err = create_diff(s);
5957 		break;
5958 	default:
5959 		view->count = 0;
5960 		break;
5961 	}
5962 
5963 	return err;
5964 }
5965 
5966 static const struct got_error *
5967 cmd_diff(int argc, char *argv[])
5968 {
5969 	const struct got_error *error;
5970 	struct got_repository *repo = NULL;
5971 	struct got_worktree *worktree = NULL;
5972 	struct got_object_id *id1 = NULL, *id2 = NULL;
5973 	char *repo_path = NULL, *cwd = NULL;
5974 	char *id_str1 = NULL, *id_str2 = NULL;
5975 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
5976 	char *label1 = NULL, *label2 = NULL;
5977 	int diff_context = 3, ignore_whitespace = 0;
5978 	int ch, force_text_diff = 0;
5979 	const char *errstr;
5980 	struct tog_view *view;
5981 	int *pack_fds = NULL;
5982 
5983 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5984 		switch (ch) {
5985 		case 'a':
5986 			force_text_diff = 1;
5987 			break;
5988 		case 'C':
5989 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5990 			    &errstr);
5991 			if (errstr != NULL)
5992 				errx(1, "number of context lines is %s: %s",
5993 				    errstr, errstr);
5994 			break;
5995 		case 'r':
5996 			repo_path = realpath(optarg, NULL);
5997 			if (repo_path == NULL)
5998 				return got_error_from_errno2("realpath",
5999 				    optarg);
6000 			got_path_strip_trailing_slashes(repo_path);
6001 			break;
6002 		case 'w':
6003 			ignore_whitespace = 1;
6004 			break;
6005 		default:
6006 			usage_diff();
6007 			/* NOTREACHED */
6008 		}
6009 	}
6010 
6011 	argc -= optind;
6012 	argv += optind;
6013 
6014 	if (argc == 0) {
6015 		usage_diff(); /* TODO show local worktree changes */
6016 	} else if (argc == 2) {
6017 		id_str1 = argv[0];
6018 		id_str2 = argv[1];
6019 	} else
6020 		usage_diff();
6021 
6022 	error = got_repo_pack_fds_open(&pack_fds);
6023 	if (error)
6024 		goto done;
6025 
6026 	if (repo_path == NULL) {
6027 		cwd = getcwd(NULL, 0);
6028 		if (cwd == NULL)
6029 			return got_error_from_errno("getcwd");
6030 		error = got_worktree_open(&worktree, cwd, NULL);
6031 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6032 			goto done;
6033 		if (worktree)
6034 			repo_path =
6035 			    strdup(got_worktree_get_repo_path(worktree));
6036 		else
6037 			repo_path = strdup(cwd);
6038 		if (repo_path == NULL) {
6039 			error = got_error_from_errno("strdup");
6040 			goto done;
6041 		}
6042 	}
6043 
6044 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6045 	if (error)
6046 		goto done;
6047 
6048 	init_curses();
6049 
6050 	error = apply_unveil(got_repo_get_path(repo), NULL);
6051 	if (error)
6052 		goto done;
6053 
6054 	error = tog_load_refs(repo, 0);
6055 	if (error)
6056 		goto done;
6057 
6058 	if (id_str1 != NULL) {
6059 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6060 		    repo, worktree);
6061 		if (error != NULL)
6062 			goto done;
6063 		if (keyword_idstr1 != NULL)
6064 			id_str1 = keyword_idstr1;
6065 	}
6066 	if (id_str2 != NULL) {
6067 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6068 		    repo, worktree);
6069 		if (error != NULL)
6070 			goto done;
6071 		if (keyword_idstr2 != NULL)
6072 			id_str2 = keyword_idstr2;
6073 	}
6074 
6075 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6076 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6077 	if (error)
6078 		goto done;
6079 
6080 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6081 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6082 	if (error)
6083 		goto done;
6084 
6085 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6086 	if (view == NULL) {
6087 		error = got_error_from_errno("view_open");
6088 		goto done;
6089 	}
6090 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6091 	    ignore_whitespace, force_text_diff, NULL,  repo);
6092 	if (error)
6093 		goto done;
6094 
6095 	if (worktree) {
6096 		error = set_tog_base_commit(repo, worktree);
6097 		if (error != NULL)
6098 			goto done;
6099 	}
6100 
6101 	error = view_loop(view);
6102 
6103 done:
6104 	free(tog_base_commit.id);
6105 	free(keyword_idstr1);
6106 	free(keyword_idstr2);
6107 	free(label1);
6108 	free(label2);
6109 	free(repo_path);
6110 	free(cwd);
6111 	if (repo) {
6112 		const struct got_error *close_err = got_repo_close(repo);
6113 		if (error == NULL)
6114 			error = close_err;
6115 	}
6116 	if (worktree)
6117 		got_worktree_close(worktree);
6118 	if (pack_fds) {
6119 		const struct got_error *pack_err =
6120 		    got_repo_pack_fds_close(pack_fds);
6121 		if (error == NULL)
6122 			error = pack_err;
6123 	}
6124 	tog_free_refs();
6125 	return error;
6126 }
6127 
6128 __dead static void
6129 usage_blame(void)
6130 {
6131 	endwin();
6132 	fprintf(stderr,
6133 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6134 	    getprogname());
6135 	exit(1);
6136 }
6137 
6138 struct tog_blame_line {
6139 	int annotated;
6140 	struct got_object_id *id;
6141 };
6142 
6143 static const struct got_error *
6144 draw_blame(struct tog_view *view)
6145 {
6146 	struct tog_blame_view_state *s = &view->state.blame;
6147 	struct tog_blame *blame = &s->blame;
6148 	regmatch_t *regmatch = &view->regmatch;
6149 	const struct got_error *err;
6150 	int lineno = 0, nprinted = 0;
6151 	char *line = NULL;
6152 	size_t linesize = 0;
6153 	ssize_t linelen;
6154 	wchar_t *wline;
6155 	int width;
6156 	struct tog_blame_line *blame_line;
6157 	struct got_object_id *prev_id = NULL;
6158 	char *id_str;
6159 	struct tog_color *tc;
6160 
6161 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6162 	if (err)
6163 		return err;
6164 
6165 	rewind(blame->f);
6166 	werase(view->window);
6167 
6168 	if (asprintf(&line, "commit %s", id_str) == -1) {
6169 		err = got_error_from_errno("asprintf");
6170 		free(id_str);
6171 		return err;
6172 	}
6173 
6174 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6175 	free(line);
6176 	line = NULL;
6177 	if (err)
6178 		return err;
6179 	if (view_needs_focus_indication(view))
6180 		wstandout(view->window);
6181 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6182 	if (tc)
6183 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6184 	waddwstr(view->window, wline);
6185 	while (width++ < view->ncols)
6186 		waddch(view->window, ' ');
6187 	if (tc)
6188 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6189 	if (view_needs_focus_indication(view))
6190 		wstandend(view->window);
6191 	free(wline);
6192 	wline = NULL;
6193 
6194 	if (view->gline > blame->nlines)
6195 		view->gline = blame->nlines;
6196 
6197 	if (tog_io.wait_for_ui) {
6198 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6199 		int rc;
6200 
6201 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6202 		if (rc)
6203 			return got_error_set_errno(rc, "pthread_cond_wait");
6204 		tog_io.wait_for_ui = 0;
6205 	}
6206 
6207 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6208 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6209 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6210 		free(id_str);
6211 		return got_error_from_errno("asprintf");
6212 	}
6213 	free(id_str);
6214 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6215 	free(line);
6216 	line = NULL;
6217 	if (err)
6218 		return err;
6219 	waddwstr(view->window, wline);
6220 	free(wline);
6221 	wline = NULL;
6222 	if (width < view->ncols - 1)
6223 		waddch(view->window, '\n');
6224 
6225 	s->eof = 0;
6226 	view->maxx = 0;
6227 	while (nprinted < view->nlines - 2) {
6228 		linelen = getline(&line, &linesize, blame->f);
6229 		if (linelen == -1) {
6230 			if (feof(blame->f)) {
6231 				s->eof = 1;
6232 				break;
6233 			}
6234 			free(line);
6235 			return got_ferror(blame->f, GOT_ERR_IO);
6236 		}
6237 		if (++lineno < s->first_displayed_line)
6238 			continue;
6239 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6240 			continue;
6241 
6242 		/* Set view->maxx based on full line length. */
6243 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6244 		if (err) {
6245 			free(line);
6246 			return err;
6247 		}
6248 		free(wline);
6249 		wline = NULL;
6250 		view->maxx = MAX(view->maxx, width);
6251 
6252 		if (nprinted == s->selected_line - 1)
6253 			wstandout(view->window);
6254 
6255 		if (blame->nlines > 0) {
6256 			blame_line = &blame->lines[lineno - 1];
6257 			if (blame_line->annotated && prev_id &&
6258 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6259 			    !(nprinted == s->selected_line - 1)) {
6260 				waddstr(view->window, "        ");
6261 			} else if (blame_line->annotated) {
6262 				char *id_str;
6263 				err = got_object_id_str(&id_str,
6264 				    blame_line->id);
6265 				if (err) {
6266 					free(line);
6267 					return err;
6268 				}
6269 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6270 				if (tc)
6271 					wattr_on(view->window,
6272 					    COLOR_PAIR(tc->colorpair), NULL);
6273 				wprintw(view->window, "%.8s", id_str);
6274 				if (tc)
6275 					wattr_off(view->window,
6276 					    COLOR_PAIR(tc->colorpair), NULL);
6277 				free(id_str);
6278 				prev_id = blame_line->id;
6279 			} else {
6280 				waddstr(view->window, "........");
6281 				prev_id = NULL;
6282 			}
6283 		} else {
6284 			waddstr(view->window, "........");
6285 			prev_id = NULL;
6286 		}
6287 
6288 		if (nprinted == s->selected_line - 1)
6289 			wstandend(view->window);
6290 		waddstr(view->window, " ");
6291 
6292 		if (view->ncols <= 9) {
6293 			width = 9;
6294 		} else if (s->first_displayed_line + nprinted ==
6295 		    s->matched_line &&
6296 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6297 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6298 			    view->window, view->x, regmatch);
6299 			if (err) {
6300 				free(line);
6301 				return err;
6302 			}
6303 			width += 9;
6304 		} else {
6305 			int skip;
6306 			err = format_line(&wline, &width, &skip, line,
6307 			    view->x, view->ncols - 9, 9, 1);
6308 			if (err) {
6309 				free(line);
6310 				return err;
6311 			}
6312 			waddwstr(view->window, &wline[skip]);
6313 			width += 9;
6314 			free(wline);
6315 			wline = NULL;
6316 		}
6317 
6318 		if (width <= view->ncols - 1)
6319 			waddch(view->window, '\n');
6320 		if (++nprinted == 1)
6321 			s->first_displayed_line = lineno;
6322 	}
6323 	free(line);
6324 	s->last_displayed_line = lineno;
6325 
6326 	view_border(view);
6327 
6328 	return NULL;
6329 }
6330 
6331 static const struct got_error *
6332 blame_cb(void *arg, int nlines, int lineno,
6333     struct got_commit_object *commit, struct got_object_id *id)
6334 {
6335 	const struct got_error *err = NULL;
6336 	struct tog_blame_cb_args *a = arg;
6337 	struct tog_blame_line *line;
6338 	int errcode;
6339 
6340 	if (nlines != a->nlines ||
6341 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6342 		return got_error(GOT_ERR_RANGE);
6343 
6344 	errcode = pthread_mutex_lock(&tog_mutex);
6345 	if (errcode)
6346 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6347 
6348 	if (*a->quit) {	/* user has quit the blame view */
6349 		err = got_error(GOT_ERR_ITER_COMPLETED);
6350 		goto done;
6351 	}
6352 
6353 	if (lineno == -1)
6354 		goto done; /* no change in this commit */
6355 
6356 	line = &a->lines[lineno - 1];
6357 	if (line->annotated)
6358 		goto done;
6359 
6360 	line->id = got_object_id_dup(id);
6361 	if (line->id == NULL) {
6362 		err = got_error_from_errno("got_object_id_dup");
6363 		goto done;
6364 	}
6365 	line->annotated = 1;
6366 done:
6367 	errcode = pthread_mutex_unlock(&tog_mutex);
6368 	if (errcode)
6369 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6370 	return err;
6371 }
6372 
6373 static void *
6374 blame_thread(void *arg)
6375 {
6376 	const struct got_error *err, *close_err;
6377 	struct tog_blame_thread_args *ta = arg;
6378 	struct tog_blame_cb_args *a = ta->cb_args;
6379 	int errcode, fd1 = -1, fd2 = -1;
6380 	FILE *f1 = NULL, *f2 = NULL;
6381 
6382 	fd1 = got_opentempfd();
6383 	if (fd1 == -1)
6384 		return (void *)got_error_from_errno("got_opentempfd");
6385 
6386 	fd2 = got_opentempfd();
6387 	if (fd2 == -1) {
6388 		err = got_error_from_errno("got_opentempfd");
6389 		goto done;
6390 	}
6391 
6392 	f1 = got_opentemp();
6393 	if (f1 == NULL) {
6394 		err = (void *)got_error_from_errno("got_opentemp");
6395 		goto done;
6396 	}
6397 	f2 = got_opentemp();
6398 	if (f2 == NULL) {
6399 		err = (void *)got_error_from_errno("got_opentemp");
6400 		goto done;
6401 	}
6402 
6403 	err = block_signals_used_by_main_thread();
6404 	if (err)
6405 		goto done;
6406 
6407 	err = got_blame(ta->path, a->commit_id, ta->repo,
6408 	    tog_diff_algo, blame_cb, ta->cb_args,
6409 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6410 	if (err && err->code == GOT_ERR_CANCELLED)
6411 		err = NULL;
6412 
6413 	errcode = pthread_mutex_lock(&tog_mutex);
6414 	if (errcode) {
6415 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6416 		goto done;
6417 	}
6418 
6419 	close_err = got_repo_close(ta->repo);
6420 	if (err == NULL)
6421 		err = close_err;
6422 	ta->repo = NULL;
6423 	*ta->complete = 1;
6424 
6425 	if (tog_io.wait_for_ui) {
6426 		errcode = pthread_cond_signal(&ta->blame_complete);
6427 		if (errcode && err == NULL)
6428 			err = got_error_set_errno(errcode,
6429 			    "pthread_cond_signal");
6430 	}
6431 
6432 	errcode = pthread_mutex_unlock(&tog_mutex);
6433 	if (errcode && err == NULL)
6434 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6435 
6436 done:
6437 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6438 		err = got_error_from_errno("close");
6439 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6440 		err = got_error_from_errno("close");
6441 	if (f1 && fclose(f1) == EOF && err == NULL)
6442 		err = got_error_from_errno("fclose");
6443 	if (f2 && fclose(f2) == EOF && err == NULL)
6444 		err = got_error_from_errno("fclose");
6445 
6446 	return (void *)err;
6447 }
6448 
6449 static struct got_object_id *
6450 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6451     int first_displayed_line, int selected_line)
6452 {
6453 	struct tog_blame_line *line;
6454 
6455 	if (nlines <= 0)
6456 		return NULL;
6457 
6458 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6459 	if (!line->annotated)
6460 		return NULL;
6461 
6462 	return line->id;
6463 }
6464 
6465 static struct got_object_id *
6466 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6467     int lineno)
6468 {
6469 	struct tog_blame_line *line;
6470 
6471 	if (nlines <= 0 || lineno >= nlines)
6472 		return NULL;
6473 
6474 	line = &lines[lineno - 1];
6475 	if (!line->annotated)
6476 		return NULL;
6477 
6478 	return line->id;
6479 }
6480 
6481 static const struct got_error *
6482 stop_blame(struct tog_blame *blame)
6483 {
6484 	const struct got_error *err = NULL;
6485 	int i;
6486 
6487 	if (blame->thread) {
6488 		int errcode;
6489 		errcode = pthread_mutex_unlock(&tog_mutex);
6490 		if (errcode)
6491 			return got_error_set_errno(errcode,
6492 			    "pthread_mutex_unlock");
6493 		errcode = pthread_join(blame->thread, (void **)&err);
6494 		if (errcode)
6495 			return got_error_set_errno(errcode, "pthread_join");
6496 		errcode = pthread_mutex_lock(&tog_mutex);
6497 		if (errcode)
6498 			return got_error_set_errno(errcode,
6499 			    "pthread_mutex_lock");
6500 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6501 			err = NULL;
6502 		blame->thread = NULL;
6503 	}
6504 	if (blame->thread_args.repo) {
6505 		const struct got_error *close_err;
6506 		close_err = got_repo_close(blame->thread_args.repo);
6507 		if (err == NULL)
6508 			err = close_err;
6509 		blame->thread_args.repo = NULL;
6510 	}
6511 	if (blame->f) {
6512 		if (fclose(blame->f) == EOF && err == NULL)
6513 			err = got_error_from_errno("fclose");
6514 		blame->f = NULL;
6515 	}
6516 	if (blame->lines) {
6517 		for (i = 0; i < blame->nlines; i++)
6518 			free(blame->lines[i].id);
6519 		free(blame->lines);
6520 		blame->lines = NULL;
6521 	}
6522 	free(blame->cb_args.commit_id);
6523 	blame->cb_args.commit_id = NULL;
6524 	if (blame->pack_fds) {
6525 		const struct got_error *pack_err =
6526 		    got_repo_pack_fds_close(blame->pack_fds);
6527 		if (err == NULL)
6528 			err = pack_err;
6529 		blame->pack_fds = NULL;
6530 	}
6531 	return err;
6532 }
6533 
6534 static const struct got_error *
6535 cancel_blame_view(void *arg)
6536 {
6537 	const struct got_error *err = NULL;
6538 	int *done = arg;
6539 	int errcode;
6540 
6541 	errcode = pthread_mutex_lock(&tog_mutex);
6542 	if (errcode)
6543 		return got_error_set_errno(errcode,
6544 		    "pthread_mutex_unlock");
6545 
6546 	if (*done)
6547 		err = got_error(GOT_ERR_CANCELLED);
6548 
6549 	errcode = pthread_mutex_unlock(&tog_mutex);
6550 	if (errcode)
6551 		return got_error_set_errno(errcode,
6552 		    "pthread_mutex_lock");
6553 
6554 	return err;
6555 }
6556 
6557 static const struct got_error *
6558 run_blame(struct tog_view *view)
6559 {
6560 	struct tog_blame_view_state *s = &view->state.blame;
6561 	struct tog_blame *blame = &s->blame;
6562 	const struct got_error *err = NULL;
6563 	struct got_commit_object *commit = NULL;
6564 	struct got_blob_object *blob = NULL;
6565 	struct got_repository *thread_repo = NULL;
6566 	struct got_object_id *obj_id = NULL;
6567 	int obj_type, fd = -1;
6568 	int *pack_fds = NULL;
6569 
6570 	err = got_object_open_as_commit(&commit, s->repo,
6571 	    &s->blamed_commit->id);
6572 	if (err)
6573 		return err;
6574 
6575 	fd = got_opentempfd();
6576 	if (fd == -1) {
6577 		err = got_error_from_errno("got_opentempfd");
6578 		goto done;
6579 	}
6580 
6581 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6582 	if (err)
6583 		goto done;
6584 
6585 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6586 	if (err)
6587 		goto done;
6588 
6589 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6590 		err = got_error(GOT_ERR_OBJ_TYPE);
6591 		goto done;
6592 	}
6593 
6594 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6595 	if (err)
6596 		goto done;
6597 	blame->f = got_opentemp();
6598 	if (blame->f == NULL) {
6599 		err = got_error_from_errno("got_opentemp");
6600 		goto done;
6601 	}
6602 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6603 	    &blame->line_offsets, blame->f, blob);
6604 	if (err)
6605 		goto done;
6606 	if (blame->nlines == 0) {
6607 		s->blame_complete = 1;
6608 		goto done;
6609 	}
6610 
6611 	/* Don't include \n at EOF in the blame line count. */
6612 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6613 		blame->nlines--;
6614 
6615 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6616 	if (blame->lines == NULL) {
6617 		err = got_error_from_errno("calloc");
6618 		goto done;
6619 	}
6620 
6621 	err = got_repo_pack_fds_open(&pack_fds);
6622 	if (err)
6623 		goto done;
6624 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6625 	    pack_fds);
6626 	if (err)
6627 		goto done;
6628 
6629 	blame->pack_fds = pack_fds;
6630 	blame->cb_args.view = view;
6631 	blame->cb_args.lines = blame->lines;
6632 	blame->cb_args.nlines = blame->nlines;
6633 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6634 	if (blame->cb_args.commit_id == NULL) {
6635 		err = got_error_from_errno("got_object_id_dup");
6636 		goto done;
6637 	}
6638 	blame->cb_args.quit = &s->done;
6639 
6640 	blame->thread_args.path = s->path;
6641 	blame->thread_args.repo = thread_repo;
6642 	blame->thread_args.cb_args = &blame->cb_args;
6643 	blame->thread_args.complete = &s->blame_complete;
6644 	blame->thread_args.cancel_cb = cancel_blame_view;
6645 	blame->thread_args.cancel_arg = &s->done;
6646 	s->blame_complete = 0;
6647 
6648 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6649 		s->first_displayed_line = 1;
6650 		s->last_displayed_line = view->nlines;
6651 		s->selected_line = 1;
6652 	}
6653 	s->matched_line = 0;
6654 
6655 done:
6656 	if (commit)
6657 		got_object_commit_close(commit);
6658 	if (fd != -1 && close(fd) == -1 && err == NULL)
6659 		err = got_error_from_errno("close");
6660 	if (blob)
6661 		got_object_blob_close(blob);
6662 	free(obj_id);
6663 	if (err)
6664 		stop_blame(blame);
6665 	return err;
6666 }
6667 
6668 static const struct got_error *
6669 open_blame_view(struct tog_view *view, char *path,
6670     struct got_object_id *commit_id, struct got_repository *repo)
6671 {
6672 	const struct got_error *err = NULL;
6673 	struct tog_blame_view_state *s = &view->state.blame;
6674 
6675 	STAILQ_INIT(&s->blamed_commits);
6676 
6677 	s->path = strdup(path);
6678 	if (s->path == NULL)
6679 		return got_error_from_errno("strdup");
6680 
6681 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6682 	if (err) {
6683 		free(s->path);
6684 		return err;
6685 	}
6686 
6687 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6688 	s->first_displayed_line = 1;
6689 	s->last_displayed_line = view->nlines;
6690 	s->selected_line = 1;
6691 	s->blame_complete = 0;
6692 	s->repo = repo;
6693 	s->commit_id = commit_id;
6694 	memset(&s->blame, 0, sizeof(s->blame));
6695 
6696 	STAILQ_INIT(&s->colors);
6697 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6698 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6699 		    get_color_value("TOG_COLOR_COMMIT"));
6700 		if (err)
6701 			return err;
6702 	}
6703 
6704 	view->show = show_blame_view;
6705 	view->input = input_blame_view;
6706 	view->reset = reset_blame_view;
6707 	view->close = close_blame_view;
6708 	view->search_start = search_start_blame_view;
6709 	view->search_setup = search_setup_blame_view;
6710 	view->search_next = search_next_view_match;
6711 
6712 	if (using_mock_io) {
6713 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6714 		int rc;
6715 
6716 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6717 		if (rc)
6718 			return got_error_set_errno(rc, "pthread_cond_init");
6719 	}
6720 
6721 	return run_blame(view);
6722 }
6723 
6724 static const struct got_error *
6725 close_blame_view(struct tog_view *view)
6726 {
6727 	const struct got_error *err = NULL;
6728 	struct tog_blame_view_state *s = &view->state.blame;
6729 
6730 	if (s->blame.thread)
6731 		err = stop_blame(&s->blame);
6732 
6733 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6734 		struct got_object_qid *blamed_commit;
6735 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6736 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6737 		got_object_qid_free(blamed_commit);
6738 	}
6739 
6740 	if (using_mock_io) {
6741 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6742 		int rc;
6743 
6744 		rc = pthread_cond_destroy(&bta->blame_complete);
6745 		if (rc && err == NULL)
6746 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6747 	}
6748 
6749 	free(s->path);
6750 	free_colors(&s->colors);
6751 	return err;
6752 }
6753 
6754 static const struct got_error *
6755 search_start_blame_view(struct tog_view *view)
6756 {
6757 	struct tog_blame_view_state *s = &view->state.blame;
6758 
6759 	s->matched_line = 0;
6760 	return NULL;
6761 }
6762 
6763 static void
6764 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6765     size_t *nlines, int **first, int **last, int **match, int **selected)
6766 {
6767 	struct tog_blame_view_state *s = &view->state.blame;
6768 
6769 	*f = s->blame.f;
6770 	*nlines = s->blame.nlines;
6771 	*line_offsets = s->blame.line_offsets;
6772 	*match = &s->matched_line;
6773 	*first = &s->first_displayed_line;
6774 	*last = &s->last_displayed_line;
6775 	*selected = &s->selected_line;
6776 }
6777 
6778 static const struct got_error *
6779 show_blame_view(struct tog_view *view)
6780 {
6781 	const struct got_error *err = NULL;
6782 	struct tog_blame_view_state *s = &view->state.blame;
6783 	int errcode;
6784 
6785 	if (s->blame.thread == NULL && !s->blame_complete) {
6786 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6787 		    &s->blame.thread_args);
6788 		if (errcode)
6789 			return got_error_set_errno(errcode, "pthread_create");
6790 
6791 		if (!using_mock_io)
6792 			halfdelay(1); /* fast refresh while annotating  */
6793 	}
6794 
6795 	if (s->blame_complete && !using_mock_io)
6796 		halfdelay(10); /* disable fast refresh */
6797 
6798 	err = draw_blame(view);
6799 
6800 	view_border(view);
6801 	return err;
6802 }
6803 
6804 static const struct got_error *
6805 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6806     struct got_repository *repo, struct got_object_id *id)
6807 {
6808 	struct tog_view		*log_view;
6809 	const struct got_error	*err = NULL;
6810 
6811 	*new_view = NULL;
6812 
6813 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6814 	if (log_view == NULL)
6815 		return got_error_from_errno("view_open");
6816 
6817 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6818 	if (err)
6819 		view_close(log_view);
6820 	else
6821 		*new_view = log_view;
6822 
6823 	return err;
6824 }
6825 
6826 static const struct got_error *
6827 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6828 {
6829 	const struct got_error *err = NULL, *thread_err = NULL;
6830 	struct tog_view *diff_view;
6831 	struct tog_blame_view_state *s = &view->state.blame;
6832 	int eos, nscroll, begin_y = 0, begin_x = 0;
6833 
6834 	eos = nscroll = view->nlines - 2;
6835 	if (view_is_hsplit_top(view))
6836 		--eos;  /* border */
6837 
6838 	switch (ch) {
6839 	case '0':
6840 	case '$':
6841 	case KEY_RIGHT:
6842 	case 'l':
6843 	case KEY_LEFT:
6844 	case 'h':
6845 		horizontal_scroll_input(view, ch);
6846 		break;
6847 	case 'q':
6848 		s->done = 1;
6849 		break;
6850 	case 'g':
6851 	case KEY_HOME:
6852 		s->selected_line = 1;
6853 		s->first_displayed_line = 1;
6854 		view->count = 0;
6855 		break;
6856 	case 'G':
6857 	case KEY_END:
6858 		if (s->blame.nlines < eos) {
6859 			s->selected_line = s->blame.nlines;
6860 			s->first_displayed_line = 1;
6861 		} else {
6862 			s->selected_line = eos;
6863 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6864 		}
6865 		view->count = 0;
6866 		break;
6867 	case 'k':
6868 	case KEY_UP:
6869 	case CTRL('p'):
6870 		if (s->selected_line > 1)
6871 			s->selected_line--;
6872 		else if (s->selected_line == 1 &&
6873 		    s->first_displayed_line > 1)
6874 			s->first_displayed_line--;
6875 		else
6876 			view->count = 0;
6877 		break;
6878 	case CTRL('u'):
6879 	case 'u':
6880 		nscroll /= 2;
6881 		/* FALL THROUGH */
6882 	case KEY_PPAGE:
6883 	case CTRL('b'):
6884 	case 'b':
6885 		if (s->first_displayed_line == 1) {
6886 			if (view->count > 1)
6887 				nscroll += nscroll;
6888 			s->selected_line = MAX(1, s->selected_line - nscroll);
6889 			view->count = 0;
6890 			break;
6891 		}
6892 		if (s->first_displayed_line > nscroll)
6893 			s->first_displayed_line -= nscroll;
6894 		else
6895 			s->first_displayed_line = 1;
6896 		break;
6897 	case 'j':
6898 	case KEY_DOWN:
6899 	case CTRL('n'):
6900 		if (s->selected_line < eos && s->first_displayed_line +
6901 		    s->selected_line <= s->blame.nlines)
6902 			s->selected_line++;
6903 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6904 			s->first_displayed_line++;
6905 		else
6906 			view->count = 0;
6907 		break;
6908 	case 'c':
6909 	case 'p': {
6910 		struct got_object_id *id = NULL;
6911 
6912 		view->count = 0;
6913 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6914 		    s->first_displayed_line, s->selected_line);
6915 		if (id == NULL)
6916 			break;
6917 		if (ch == 'p') {
6918 			struct got_commit_object *commit, *pcommit;
6919 			struct got_object_qid *pid;
6920 			struct got_object_id *blob_id = NULL;
6921 			int obj_type;
6922 			err = got_object_open_as_commit(&commit,
6923 			    s->repo, id);
6924 			if (err)
6925 				break;
6926 			pid = STAILQ_FIRST(
6927 			    got_object_commit_get_parent_ids(commit));
6928 			if (pid == NULL) {
6929 				got_object_commit_close(commit);
6930 				break;
6931 			}
6932 			/* Check if path history ends here. */
6933 			err = got_object_open_as_commit(&pcommit,
6934 			    s->repo, &pid->id);
6935 			if (err)
6936 				break;
6937 			err = got_object_id_by_path(&blob_id, s->repo,
6938 			    pcommit, s->path);
6939 			got_object_commit_close(pcommit);
6940 			if (err) {
6941 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6942 					err = NULL;
6943 				got_object_commit_close(commit);
6944 				break;
6945 			}
6946 			err = got_object_get_type(&obj_type, s->repo,
6947 			    blob_id);
6948 			free(blob_id);
6949 			/* Can't blame non-blob type objects. */
6950 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6951 				got_object_commit_close(commit);
6952 				break;
6953 			}
6954 			err = got_object_qid_alloc(&s->blamed_commit,
6955 			    &pid->id);
6956 			got_object_commit_close(commit);
6957 		} else {
6958 			if (got_object_id_cmp(id,
6959 			    &s->blamed_commit->id) == 0)
6960 				break;
6961 			err = got_object_qid_alloc(&s->blamed_commit,
6962 			    id);
6963 		}
6964 		if (err)
6965 			break;
6966 		s->done = 1;
6967 		thread_err = stop_blame(&s->blame);
6968 		s->done = 0;
6969 		if (thread_err)
6970 			break;
6971 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6972 		    s->blamed_commit, entry);
6973 		err = run_blame(view);
6974 		if (err)
6975 			break;
6976 		break;
6977 	}
6978 	case 'C': {
6979 		struct got_object_qid *first;
6980 
6981 		view->count = 0;
6982 		first = STAILQ_FIRST(&s->blamed_commits);
6983 		if (!got_object_id_cmp(&first->id, s->commit_id))
6984 			break;
6985 		s->done = 1;
6986 		thread_err = stop_blame(&s->blame);
6987 		s->done = 0;
6988 		if (thread_err)
6989 			break;
6990 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6991 		got_object_qid_free(s->blamed_commit);
6992 		s->blamed_commit =
6993 		    STAILQ_FIRST(&s->blamed_commits);
6994 		err = run_blame(view);
6995 		if (err)
6996 			break;
6997 		break;
6998 	}
6999 	case 'L':
7000 		view->count = 0;
7001 		s->id_to_log = get_selected_commit_id(s->blame.lines,
7002 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
7003 		if (s->id_to_log)
7004 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
7005 		break;
7006 	case KEY_ENTER:
7007 	case '\r': {
7008 		struct got_object_id *id = NULL;
7009 		struct got_object_qid *pid;
7010 		struct got_commit_object *commit = NULL;
7011 
7012 		view->count = 0;
7013 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
7014 		    s->first_displayed_line, s->selected_line);
7015 		if (id == NULL)
7016 			break;
7017 		err = got_object_open_as_commit(&commit, s->repo, id);
7018 		if (err)
7019 			break;
7020 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
7021 		if (*new_view) {
7022 			/* traversed from diff view, release diff resources  */
7023 			err = close_diff_view(*new_view);
7024 			if (err)
7025 				break;
7026 			diff_view = *new_view;
7027 		} else {
7028 			if (view_is_parent_view(view))
7029 				view_get_split(view, &begin_y, &begin_x);
7030 
7031 			diff_view = view_open(0, 0, begin_y, begin_x,
7032 			    TOG_VIEW_DIFF);
7033 			if (diff_view == NULL) {
7034 				got_object_commit_close(commit);
7035 				err = got_error_from_errno("view_open");
7036 				break;
7037 			}
7038 		}
7039 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
7040 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
7041 		got_object_commit_close(commit);
7042 		if (err)
7043 			break;
7044 		s->last_diffed_line = s->first_displayed_line - 1 +
7045 		    s->selected_line;
7046 		if (*new_view)
7047 			break;	/* still open from active diff view */
7048 		if (view_is_parent_view(view) &&
7049 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7050 			err = view_init_hsplit(view, begin_y);
7051 			if (err)
7052 				break;
7053 		}
7054 
7055 		view->focussed = 0;
7056 		diff_view->focussed = 1;
7057 		diff_view->mode = view->mode;
7058 		diff_view->nlines = view->lines - begin_y;
7059 		if (view_is_parent_view(view)) {
7060 			view_transfer_size(diff_view, view);
7061 			err = view_close_child(view);
7062 			if (err)
7063 				break;
7064 			err = view_set_child(view, diff_view);
7065 			if (err)
7066 				break;
7067 			view->focus_child = 1;
7068 		} else
7069 			*new_view = diff_view;
7070 		if (err)
7071 			break;
7072 		break;
7073 	}
7074 	case CTRL('d'):
7075 	case 'd':
7076 		nscroll /= 2;
7077 		/* FALL THROUGH */
7078 	case KEY_NPAGE:
7079 	case CTRL('f'):
7080 	case 'f':
7081 	case ' ':
7082 		if (s->last_displayed_line >= s->blame.nlines &&
7083 		    s->selected_line >= MIN(s->blame.nlines,
7084 		    view->nlines - 2)) {
7085 			view->count = 0;
7086 			break;
7087 		}
7088 		if (s->last_displayed_line >= s->blame.nlines &&
7089 		    s->selected_line < view->nlines - 2) {
7090 			s->selected_line +=
7091 			    MIN(nscroll, s->last_displayed_line -
7092 			    s->first_displayed_line - s->selected_line + 1);
7093 		}
7094 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7095 			s->first_displayed_line += nscroll;
7096 		else
7097 			s->first_displayed_line =
7098 			    s->blame.nlines - (view->nlines - 3);
7099 		break;
7100 	case KEY_RESIZE:
7101 		if (s->selected_line > view->nlines - 2) {
7102 			s->selected_line = MIN(s->blame.nlines,
7103 			    view->nlines - 2);
7104 		}
7105 		break;
7106 	default:
7107 		view->count = 0;
7108 		break;
7109 	}
7110 	return thread_err ? thread_err : err;
7111 }
7112 
7113 static const struct got_error *
7114 reset_blame_view(struct tog_view *view)
7115 {
7116 	const struct got_error *err;
7117 	struct tog_blame_view_state *s = &view->state.blame;
7118 
7119 	view->count = 0;
7120 	s->done = 1;
7121 	err = stop_blame(&s->blame);
7122 	s->done = 0;
7123 	if (err)
7124 		return err;
7125 	return run_blame(view);
7126 }
7127 
7128 static const struct got_error *
7129 cmd_blame(int argc, char *argv[])
7130 {
7131 	const struct got_error *error;
7132 	struct got_repository *repo = NULL;
7133 	struct got_worktree *worktree = NULL;
7134 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7135 	char *link_target = NULL;
7136 	struct got_object_id *commit_id = NULL;
7137 	struct got_commit_object *commit = NULL;
7138 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7139 	int ch;
7140 	struct tog_view *view = NULL;
7141 	int *pack_fds = NULL;
7142 
7143 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7144 		switch (ch) {
7145 		case 'c':
7146 			commit_id_str = optarg;
7147 			break;
7148 		case 'r':
7149 			repo_path = realpath(optarg, NULL);
7150 			if (repo_path == NULL)
7151 				return got_error_from_errno2("realpath",
7152 				    optarg);
7153 			break;
7154 		default:
7155 			usage_blame();
7156 			/* NOTREACHED */
7157 		}
7158 	}
7159 
7160 	argc -= optind;
7161 	argv += optind;
7162 
7163 	if (argc != 1)
7164 		usage_blame();
7165 
7166 	error = got_repo_pack_fds_open(&pack_fds);
7167 	if (error != NULL)
7168 		goto done;
7169 
7170 	if (repo_path == NULL) {
7171 		cwd = getcwd(NULL, 0);
7172 		if (cwd == NULL)
7173 			return got_error_from_errno("getcwd");
7174 		error = got_worktree_open(&worktree, cwd, NULL);
7175 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7176 			goto done;
7177 		if (worktree)
7178 			repo_path =
7179 			    strdup(got_worktree_get_repo_path(worktree));
7180 		else
7181 			repo_path = strdup(cwd);
7182 		if (repo_path == NULL) {
7183 			error = got_error_from_errno("strdup");
7184 			goto done;
7185 		}
7186 	}
7187 
7188 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7189 	if (error != NULL)
7190 		goto done;
7191 
7192 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7193 	    worktree);
7194 	if (error)
7195 		goto done;
7196 
7197 	init_curses();
7198 
7199 	error = apply_unveil(got_repo_get_path(repo), NULL);
7200 	if (error)
7201 		goto done;
7202 
7203 	error = tog_load_refs(repo, 0);
7204 	if (error)
7205 		goto done;
7206 
7207 	if (commit_id_str == NULL) {
7208 		struct got_reference *head_ref;
7209 		error = got_ref_open(&head_ref, repo, worktree ?
7210 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7211 		if (error != NULL)
7212 			goto done;
7213 		error = got_ref_resolve(&commit_id, repo, head_ref);
7214 		got_ref_close(head_ref);
7215 	} else {
7216 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7217 		    repo, worktree);
7218 		if (error != NULL)
7219 			goto done;
7220 		if (keyword_idstr != NULL)
7221 			commit_id_str = keyword_idstr;
7222 
7223 		error = got_repo_match_object_id(&commit_id, NULL,
7224 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7225 	}
7226 	if (error != NULL)
7227 		goto done;
7228 
7229 	error = got_object_open_as_commit(&commit, repo, commit_id);
7230 	if (error)
7231 		goto done;
7232 
7233 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7234 	    commit, repo);
7235 	if (error)
7236 		goto done;
7237 
7238 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7239 	if (view == NULL) {
7240 		error = got_error_from_errno("view_open");
7241 		goto done;
7242 	}
7243 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7244 	    commit_id, repo);
7245 	if (error != NULL) {
7246 		if (view->close == NULL)
7247 			close_blame_view(view);
7248 		view_close(view);
7249 		goto done;
7250 	}
7251 
7252 	if (worktree) {
7253 		error = set_tog_base_commit(repo, worktree);
7254 		if (error != NULL)
7255 			goto done;
7256 
7257 		/* Release work tree lock. */
7258 		got_worktree_close(worktree);
7259 		worktree = NULL;
7260 	}
7261 
7262 	error = view_loop(view);
7263 
7264 done:
7265 	free(tog_base_commit.id);
7266 	free(repo_path);
7267 	free(in_repo_path);
7268 	free(link_target);
7269 	free(cwd);
7270 	free(commit_id);
7271 	free(keyword_idstr);
7272 	if (commit)
7273 		got_object_commit_close(commit);
7274 	if (worktree)
7275 		got_worktree_close(worktree);
7276 	if (repo) {
7277 		const struct got_error *close_err = got_repo_close(repo);
7278 		if (error == NULL)
7279 			error = close_err;
7280 	}
7281 	if (pack_fds) {
7282 		const struct got_error *pack_err =
7283 		    got_repo_pack_fds_close(pack_fds);
7284 		if (error == NULL)
7285 			error = pack_err;
7286 	}
7287 	tog_free_refs();
7288 	return error;
7289 }
7290 
7291 static const struct got_error *
7292 draw_tree_entries(struct tog_view *view, const char *parent_path)
7293 {
7294 	struct tog_tree_view_state *s = &view->state.tree;
7295 	const struct got_error *err = NULL;
7296 	struct got_tree_entry *te;
7297 	wchar_t *wline;
7298 	char *index = NULL;
7299 	struct tog_color *tc;
7300 	int width, n, nentries, scrollx, i = 1;
7301 	int limit = view->nlines;
7302 
7303 	s->ndisplayed = 0;
7304 	if (view_is_hsplit_top(view))
7305 		--limit;  /* border */
7306 
7307 	werase(view->window);
7308 
7309 	if (limit == 0)
7310 		return NULL;
7311 
7312 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7313 	    0, 0);
7314 	if (err)
7315 		return err;
7316 	if (view_needs_focus_indication(view))
7317 		wstandout(view->window);
7318 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7319 	if (tc)
7320 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7321 	waddwstr(view->window, wline);
7322 	free(wline);
7323 	wline = NULL;
7324 	while (width++ < view->ncols)
7325 		waddch(view->window, ' ');
7326 	if (tc)
7327 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7328 	if (view_needs_focus_indication(view))
7329 		wstandend(view->window);
7330 	if (--limit <= 0)
7331 		return NULL;
7332 
7333 	i += s->selected;
7334 	if (s->first_displayed_entry) {
7335 		i += got_tree_entry_get_index(s->first_displayed_entry);
7336 		if (s->tree != s->root)
7337 			++i;  /* account for ".." entry */
7338 	}
7339 	nentries = got_object_tree_get_nentries(s->tree);
7340 	if (asprintf(&index, "[%d/%d] %s",
7341 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7342 		return got_error_from_errno("asprintf");
7343 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7344 	free(index);
7345 	if (err)
7346 		return err;
7347 	waddwstr(view->window, wline);
7348 	free(wline);
7349 	wline = NULL;
7350 	if (width < view->ncols - 1)
7351 		waddch(view->window, '\n');
7352 	if (--limit <= 0)
7353 		return NULL;
7354 	waddch(view->window, '\n');
7355 	if (--limit <= 0)
7356 		return NULL;
7357 
7358 	if (s->first_displayed_entry == NULL) {
7359 		te = got_object_tree_get_first_entry(s->tree);
7360 		if (s->selected == 0) {
7361 			if (view->focussed)
7362 				wstandout(view->window);
7363 			s->selected_entry = NULL;
7364 		}
7365 		waddstr(view->window, "  ..\n");	/* parent directory */
7366 		if (s->selected == 0 && view->focussed)
7367 			wstandend(view->window);
7368 		s->ndisplayed++;
7369 		if (--limit <= 0)
7370 			return NULL;
7371 		n = 1;
7372 	} else {
7373 		n = 0;
7374 		te = s->first_displayed_entry;
7375 	}
7376 
7377 	view->maxx = 0;
7378 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7379 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7380 		const char *modestr = "";
7381 		mode_t mode;
7382 
7383 		te = got_object_tree_get_entry(s->tree, i);
7384 		mode = got_tree_entry_get_mode(te);
7385 
7386 		if (s->show_ids) {
7387 			err = got_object_id_str(&id_str,
7388 			    got_tree_entry_get_id(te));
7389 			if (err)
7390 				return got_error_from_errno(
7391 				    "got_object_id_str");
7392 		}
7393 		if (got_object_tree_entry_is_submodule(te))
7394 			modestr = "$";
7395 		else if (S_ISLNK(mode)) {
7396 			int i;
7397 
7398 			err = got_tree_entry_get_symlink_target(&link_target,
7399 			    te, s->repo);
7400 			if (err) {
7401 				free(id_str);
7402 				return err;
7403 			}
7404 			for (i = 0; link_target[i] != '\0'; i++) {
7405 				if (!isprint((unsigned char)link_target[i]))
7406 					link_target[i] = '?';
7407 			}
7408 			modestr = "@";
7409 		}
7410 		else if (S_ISDIR(mode))
7411 			modestr = "/";
7412 		else if (mode & S_IXUSR)
7413 			modestr = "*";
7414 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7415 		    got_tree_entry_get_name(te), modestr,
7416 		    link_target ? " -> ": "",
7417 		    link_target ? link_target : "") == -1) {
7418 			free(id_str);
7419 			free(link_target);
7420 			return got_error_from_errno("asprintf");
7421 		}
7422 		free(id_str);
7423 		free(link_target);
7424 
7425 		/* use full line width to determine view->maxx */
7426 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7427 		if (err) {
7428 			free(line);
7429 			break;
7430 		}
7431 		view->maxx = MAX(view->maxx, width);
7432 		free(wline);
7433 		wline = NULL;
7434 
7435 		err = format_line(&wline, &width, &scrollx, line, view->x,
7436 		    view->ncols, 0, 0);
7437 		if (err) {
7438 			free(line);
7439 			break;
7440 		}
7441 		if (n == s->selected) {
7442 			if (view->focussed)
7443 				wstandout(view->window);
7444 			s->selected_entry = te;
7445 		}
7446 		tc = match_color(&s->colors, line);
7447 		if (tc)
7448 			wattr_on(view->window,
7449 			    COLOR_PAIR(tc->colorpair), NULL);
7450 		waddwstr(view->window, &wline[scrollx]);
7451 		if (tc)
7452 			wattr_off(view->window,
7453 			    COLOR_PAIR(tc->colorpair), NULL);
7454 		if (width < view->ncols)
7455 			waddch(view->window, '\n');
7456 		if (n == s->selected && view->focussed)
7457 			wstandend(view->window);
7458 		free(line);
7459 		free(wline);
7460 		wline = NULL;
7461 		n++;
7462 		s->ndisplayed++;
7463 		s->last_displayed_entry = te;
7464 		if (--limit <= 0)
7465 			break;
7466 	}
7467 
7468 	return err;
7469 }
7470 
7471 static void
7472 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7473 {
7474 	struct got_tree_entry *te;
7475 	int isroot = s->tree == s->root;
7476 	int i = 0;
7477 
7478 	if (s->first_displayed_entry == NULL)
7479 		return;
7480 
7481 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7482 	while (i++ < maxscroll) {
7483 		if (te == NULL) {
7484 			if (!isroot)
7485 				s->first_displayed_entry = NULL;
7486 			break;
7487 		}
7488 		s->first_displayed_entry = te;
7489 		te = got_tree_entry_get_prev(s->tree, te);
7490 	}
7491 }
7492 
7493 static const struct got_error *
7494 tree_scroll_down(struct tog_view *view, int maxscroll)
7495 {
7496 	struct tog_tree_view_state *s = &view->state.tree;
7497 	struct got_tree_entry *next, *last;
7498 	int n = 0;
7499 
7500 	if (s->first_displayed_entry)
7501 		next = got_tree_entry_get_next(s->tree,
7502 		    s->first_displayed_entry);
7503 	else
7504 		next = got_object_tree_get_first_entry(s->tree);
7505 
7506 	last = s->last_displayed_entry;
7507 	while (next && n++ < maxscroll) {
7508 		if (last) {
7509 			s->last_displayed_entry = last;
7510 			last = got_tree_entry_get_next(s->tree, last);
7511 		}
7512 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7513 			s->first_displayed_entry = next;
7514 			next = got_tree_entry_get_next(s->tree, next);
7515 		}
7516 	}
7517 
7518 	return NULL;
7519 }
7520 
7521 static const struct got_error *
7522 tree_entry_path(char **path, struct tog_parent_trees *parents,
7523     struct got_tree_entry *te)
7524 {
7525 	const struct got_error *err = NULL;
7526 	struct tog_parent_tree *pt;
7527 	size_t len = 2; /* for leading slash and NUL */
7528 
7529 	TAILQ_FOREACH(pt, parents, entry)
7530 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7531 		    + 1 /* slash */;
7532 	if (te)
7533 		len += strlen(got_tree_entry_get_name(te));
7534 
7535 	*path = calloc(1, len);
7536 	if (path == NULL)
7537 		return got_error_from_errno("calloc");
7538 
7539 	(*path)[0] = '/';
7540 	pt = TAILQ_LAST(parents, tog_parent_trees);
7541 	while (pt) {
7542 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7543 		if (strlcat(*path, name, len) >= len) {
7544 			err = got_error(GOT_ERR_NO_SPACE);
7545 			goto done;
7546 		}
7547 		if (strlcat(*path, "/", len) >= len) {
7548 			err = got_error(GOT_ERR_NO_SPACE);
7549 			goto done;
7550 		}
7551 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7552 	}
7553 	if (te) {
7554 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7555 			err = got_error(GOT_ERR_NO_SPACE);
7556 			goto done;
7557 		}
7558 	}
7559 done:
7560 	if (err) {
7561 		free(*path);
7562 		*path = NULL;
7563 	}
7564 	return err;
7565 }
7566 
7567 static const struct got_error *
7568 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7569     struct got_tree_entry *te, struct tog_parent_trees *parents,
7570     struct got_object_id *commit_id, struct got_repository *repo)
7571 {
7572 	const struct got_error *err = NULL;
7573 	char *path;
7574 	struct tog_view *blame_view;
7575 
7576 	*new_view = NULL;
7577 
7578 	err = tree_entry_path(&path, parents, te);
7579 	if (err)
7580 		return err;
7581 
7582 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7583 	if (blame_view == NULL) {
7584 		err = got_error_from_errno("view_open");
7585 		goto done;
7586 	}
7587 
7588 	err = open_blame_view(blame_view, path, commit_id, repo);
7589 	if (err) {
7590 		if (err->code == GOT_ERR_CANCELLED)
7591 			err = NULL;
7592 		view_close(blame_view);
7593 	} else
7594 		*new_view = blame_view;
7595 done:
7596 	free(path);
7597 	return err;
7598 }
7599 
7600 static const struct got_error *
7601 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7602     struct tog_tree_view_state *s)
7603 {
7604 	struct tog_view *log_view;
7605 	const struct got_error *err = NULL;
7606 	char *path;
7607 
7608 	*new_view = NULL;
7609 
7610 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7611 	if (log_view == NULL)
7612 		return got_error_from_errno("view_open");
7613 
7614 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7615 	if (err)
7616 		return err;
7617 
7618 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7619 	    path, 0);
7620 	if (err)
7621 		view_close(log_view);
7622 	else
7623 		*new_view = log_view;
7624 	free(path);
7625 	return err;
7626 }
7627 
7628 static const struct got_error *
7629 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7630     const char *head_ref_name, struct got_repository *repo)
7631 {
7632 	const struct got_error *err = NULL;
7633 	char *commit_id_str = NULL;
7634 	struct tog_tree_view_state *s = &view->state.tree;
7635 	struct got_commit_object *commit = NULL;
7636 
7637 	TAILQ_INIT(&s->parents);
7638 	STAILQ_INIT(&s->colors);
7639 
7640 	s->commit_id = got_object_id_dup(commit_id);
7641 	if (s->commit_id == NULL) {
7642 		err = got_error_from_errno("got_object_id_dup");
7643 		goto done;
7644 	}
7645 
7646 	err = got_object_open_as_commit(&commit, repo, commit_id);
7647 	if (err)
7648 		goto done;
7649 
7650 	/*
7651 	 * The root is opened here and will be closed when the view is closed.
7652 	 * Any visited subtrees and their path-wise parents are opened and
7653 	 * closed on demand.
7654 	 */
7655 	err = got_object_open_as_tree(&s->root, repo,
7656 	    got_object_commit_get_tree_id(commit));
7657 	if (err)
7658 		goto done;
7659 	s->tree = s->root;
7660 
7661 	err = got_object_id_str(&commit_id_str, commit_id);
7662 	if (err != NULL)
7663 		goto done;
7664 
7665 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7666 		err = got_error_from_errno("asprintf");
7667 		goto done;
7668 	}
7669 
7670 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7671 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7672 	if (head_ref_name) {
7673 		s->head_ref_name = strdup(head_ref_name);
7674 		if (s->head_ref_name == NULL) {
7675 			err = got_error_from_errno("strdup");
7676 			goto done;
7677 		}
7678 	}
7679 	s->repo = repo;
7680 
7681 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7682 		err = add_color(&s->colors, "\\$$",
7683 		    TOG_COLOR_TREE_SUBMODULE,
7684 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7685 		if (err)
7686 			goto done;
7687 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7688 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7689 		if (err)
7690 			goto done;
7691 		err = add_color(&s->colors, "/$",
7692 		    TOG_COLOR_TREE_DIRECTORY,
7693 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7694 		if (err)
7695 			goto done;
7696 
7697 		err = add_color(&s->colors, "\\*$",
7698 		    TOG_COLOR_TREE_EXECUTABLE,
7699 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7700 		if (err)
7701 			goto done;
7702 
7703 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7704 		    get_color_value("TOG_COLOR_COMMIT"));
7705 		if (err)
7706 			goto done;
7707 	}
7708 
7709 	view->show = show_tree_view;
7710 	view->input = input_tree_view;
7711 	view->close = close_tree_view;
7712 	view->search_start = search_start_tree_view;
7713 	view->search_next = search_next_tree_view;
7714 done:
7715 	free(commit_id_str);
7716 	if (commit)
7717 		got_object_commit_close(commit);
7718 	if (err) {
7719 		if (view->close == NULL)
7720 			close_tree_view(view);
7721 		view_close(view);
7722 	}
7723 	return err;
7724 }
7725 
7726 static const struct got_error *
7727 close_tree_view(struct tog_view *view)
7728 {
7729 	struct tog_tree_view_state *s = &view->state.tree;
7730 
7731 	free_colors(&s->colors);
7732 	free(s->tree_label);
7733 	s->tree_label = NULL;
7734 	free(s->commit_id);
7735 	s->commit_id = NULL;
7736 	free(s->head_ref_name);
7737 	s->head_ref_name = NULL;
7738 	while (!TAILQ_EMPTY(&s->parents)) {
7739 		struct tog_parent_tree *parent;
7740 		parent = TAILQ_FIRST(&s->parents);
7741 		TAILQ_REMOVE(&s->parents, parent, entry);
7742 		if (parent->tree != s->root)
7743 			got_object_tree_close(parent->tree);
7744 		free(parent);
7745 
7746 	}
7747 	if (s->tree != NULL && s->tree != s->root)
7748 		got_object_tree_close(s->tree);
7749 	if (s->root)
7750 		got_object_tree_close(s->root);
7751 	return NULL;
7752 }
7753 
7754 static const struct got_error *
7755 search_start_tree_view(struct tog_view *view)
7756 {
7757 	struct tog_tree_view_state *s = &view->state.tree;
7758 
7759 	s->matched_entry = NULL;
7760 	return NULL;
7761 }
7762 
7763 static int
7764 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7765 {
7766 	regmatch_t regmatch;
7767 
7768 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7769 	    0) == 0;
7770 }
7771 
7772 static const struct got_error *
7773 search_next_tree_view(struct tog_view *view)
7774 {
7775 	struct tog_tree_view_state *s = &view->state.tree;
7776 	struct got_tree_entry *te = NULL;
7777 
7778 	if (!view->searching) {
7779 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7780 		return NULL;
7781 	}
7782 
7783 	if (s->matched_entry) {
7784 		if (view->searching == TOG_SEARCH_FORWARD) {
7785 			if (s->selected_entry)
7786 				te = got_tree_entry_get_next(s->tree,
7787 				    s->selected_entry);
7788 			else
7789 				te = got_object_tree_get_first_entry(s->tree);
7790 		} else {
7791 			if (s->selected_entry == NULL)
7792 				te = got_object_tree_get_last_entry(s->tree);
7793 			else
7794 				te = got_tree_entry_get_prev(s->tree,
7795 				    s->selected_entry);
7796 		}
7797 	} else {
7798 		if (s->selected_entry)
7799 			te = s->selected_entry;
7800 		else if (view->searching == TOG_SEARCH_FORWARD)
7801 			te = got_object_tree_get_first_entry(s->tree);
7802 		else
7803 			te = got_object_tree_get_last_entry(s->tree);
7804 	}
7805 
7806 	while (1) {
7807 		if (te == NULL) {
7808 			if (s->matched_entry == NULL) {
7809 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7810 				return NULL;
7811 			}
7812 			if (view->searching == TOG_SEARCH_FORWARD)
7813 				te = got_object_tree_get_first_entry(s->tree);
7814 			else
7815 				te = got_object_tree_get_last_entry(s->tree);
7816 		}
7817 
7818 		if (match_tree_entry(te, &view->regex)) {
7819 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7820 			s->matched_entry = te;
7821 			break;
7822 		}
7823 
7824 		if (view->searching == TOG_SEARCH_FORWARD)
7825 			te = got_tree_entry_get_next(s->tree, te);
7826 		else
7827 			te = got_tree_entry_get_prev(s->tree, te);
7828 	}
7829 
7830 	if (s->matched_entry) {
7831 		s->first_displayed_entry = s->matched_entry;
7832 		s->selected = 0;
7833 	}
7834 
7835 	return NULL;
7836 }
7837 
7838 static const struct got_error *
7839 show_tree_view(struct tog_view *view)
7840 {
7841 	const struct got_error *err = NULL;
7842 	struct tog_tree_view_state *s = &view->state.tree;
7843 	char *parent_path;
7844 
7845 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7846 	if (err)
7847 		return err;
7848 
7849 	err = draw_tree_entries(view, parent_path);
7850 	free(parent_path);
7851 
7852 	view_border(view);
7853 	return err;
7854 }
7855 
7856 static const struct got_error *
7857 tree_goto_line(struct tog_view *view, int nlines)
7858 {
7859 	const struct got_error		 *err = NULL;
7860 	struct tog_tree_view_state	 *s = &view->state.tree;
7861 	struct got_tree_entry		**fte, **lte, **ste;
7862 	int				  g, last, first = 1, i = 1;
7863 	int				  root = s->tree == s->root;
7864 	int				  off = root ? 1 : 2;
7865 
7866 	g = view->gline;
7867 	view->gline = 0;
7868 
7869 	if (g == 0)
7870 		g = 1;
7871 	else if (g > got_object_tree_get_nentries(s->tree))
7872 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7873 
7874 	fte = &s->first_displayed_entry;
7875 	lte = &s->last_displayed_entry;
7876 	ste = &s->selected_entry;
7877 
7878 	if (*fte != NULL) {
7879 		first = got_tree_entry_get_index(*fte);
7880 		first += off;  /* account for ".." */
7881 	}
7882 	last = got_tree_entry_get_index(*lte);
7883 	last += off;
7884 
7885 	if (g >= first && g <= last && g - first < nlines) {
7886 		s->selected = g - first;
7887 		return NULL;	/* gline is on the current page */
7888 	}
7889 
7890 	if (*ste != NULL) {
7891 		i = got_tree_entry_get_index(*ste);
7892 		i += off;
7893 	}
7894 
7895 	if (i < g) {
7896 		err = tree_scroll_down(view, g - i);
7897 		if (err)
7898 			return err;
7899 		if (got_tree_entry_get_index(*lte) >=
7900 		    got_object_tree_get_nentries(s->tree) - 1 &&
7901 		    first + s->selected < g &&
7902 		    s->selected < s->ndisplayed - 1) {
7903 			first = got_tree_entry_get_index(*fte);
7904 			first += off;
7905 			s->selected = g - first;
7906 		}
7907 	} else if (i > g)
7908 		tree_scroll_up(s, i - g);
7909 
7910 	if (g < nlines &&
7911 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7912 		s->selected = g - 1;
7913 
7914 	return NULL;
7915 }
7916 
7917 static const struct got_error *
7918 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7919 {
7920 	const struct got_error *err = NULL;
7921 	struct tog_tree_view_state *s = &view->state.tree;
7922 	struct got_tree_entry *te;
7923 	int n, nscroll = view->nlines - 3;
7924 
7925 	if (view->gline)
7926 		return tree_goto_line(view, nscroll);
7927 
7928 	switch (ch) {
7929 	case '0':
7930 	case '$':
7931 	case KEY_RIGHT:
7932 	case 'l':
7933 	case KEY_LEFT:
7934 	case 'h':
7935 		horizontal_scroll_input(view, ch);
7936 		break;
7937 	case 'i':
7938 		s->show_ids = !s->show_ids;
7939 		view->count = 0;
7940 		break;
7941 	case 'L':
7942 		view->count = 0;
7943 		if (!s->selected_entry)
7944 			break;
7945 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7946 		break;
7947 	case 'R':
7948 		view->count = 0;
7949 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7950 		break;
7951 	case 'g':
7952 	case '=':
7953 	case KEY_HOME:
7954 		s->selected = 0;
7955 		view->count = 0;
7956 		if (s->tree == s->root)
7957 			s->first_displayed_entry =
7958 			    got_object_tree_get_first_entry(s->tree);
7959 		else
7960 			s->first_displayed_entry = NULL;
7961 		break;
7962 	case 'G':
7963 	case '*':
7964 	case KEY_END: {
7965 		int eos = view->nlines - 3;
7966 
7967 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7968 			--eos;  /* border */
7969 		s->selected = 0;
7970 		view->count = 0;
7971 		te = got_object_tree_get_last_entry(s->tree);
7972 		for (n = 0; n < eos; n++) {
7973 			if (te == NULL) {
7974 				if (s->tree != s->root) {
7975 					s->first_displayed_entry = NULL;
7976 					n++;
7977 				}
7978 				break;
7979 			}
7980 			s->first_displayed_entry = te;
7981 			te = got_tree_entry_get_prev(s->tree, te);
7982 		}
7983 		if (n > 0)
7984 			s->selected = n - 1;
7985 		break;
7986 	}
7987 	case 'k':
7988 	case KEY_UP:
7989 	case CTRL('p'):
7990 		if (s->selected > 0) {
7991 			s->selected--;
7992 			break;
7993 		}
7994 		tree_scroll_up(s, 1);
7995 		if (s->selected_entry == NULL ||
7996 		    (s->tree == s->root && s->selected_entry ==
7997 		     got_object_tree_get_first_entry(s->tree)))
7998 			view->count = 0;
7999 		break;
8000 	case CTRL('u'):
8001 	case 'u':
8002 		nscroll /= 2;
8003 		/* FALL THROUGH */
8004 	case KEY_PPAGE:
8005 	case CTRL('b'):
8006 	case 'b':
8007 		if (s->tree == s->root) {
8008 			if (got_object_tree_get_first_entry(s->tree) ==
8009 			    s->first_displayed_entry)
8010 				s->selected -= MIN(s->selected, nscroll);
8011 		} else {
8012 			if (s->first_displayed_entry == NULL)
8013 				s->selected -= MIN(s->selected, nscroll);
8014 		}
8015 		tree_scroll_up(s, MAX(0, nscroll));
8016 		if (s->selected_entry == NULL ||
8017 		    (s->tree == s->root && s->selected_entry ==
8018 		     got_object_tree_get_first_entry(s->tree)))
8019 			view->count = 0;
8020 		break;
8021 	case 'j':
8022 	case KEY_DOWN:
8023 	case CTRL('n'):
8024 		if (s->selected < s->ndisplayed - 1) {
8025 			s->selected++;
8026 			break;
8027 		}
8028 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8029 		    == NULL) {
8030 			/* can't scroll any further */
8031 			view->count = 0;
8032 			break;
8033 		}
8034 		tree_scroll_down(view, 1);
8035 		break;
8036 	case CTRL('d'):
8037 	case 'd':
8038 		nscroll /= 2;
8039 		/* FALL THROUGH */
8040 	case KEY_NPAGE:
8041 	case CTRL('f'):
8042 	case 'f':
8043 	case ' ':
8044 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
8045 		    == NULL) {
8046 			/* can't scroll any further; move cursor down */
8047 			if (s->selected < s->ndisplayed - 1)
8048 				s->selected += MIN(nscroll,
8049 				    s->ndisplayed - s->selected - 1);
8050 			else
8051 				view->count = 0;
8052 			break;
8053 		}
8054 		tree_scroll_down(view, nscroll);
8055 		break;
8056 	case KEY_ENTER:
8057 	case '\r':
8058 	case KEY_BACKSPACE:
8059 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8060 			struct tog_parent_tree *parent;
8061 			/* user selected '..' */
8062 			if (s->tree == s->root) {
8063 				view->count = 0;
8064 				break;
8065 			}
8066 			parent = TAILQ_FIRST(&s->parents);
8067 			TAILQ_REMOVE(&s->parents, parent,
8068 			    entry);
8069 			got_object_tree_close(s->tree);
8070 			s->tree = parent->tree;
8071 			s->first_displayed_entry =
8072 			    parent->first_displayed_entry;
8073 			s->selected_entry =
8074 			    parent->selected_entry;
8075 			s->selected = parent->selected;
8076 			if (s->selected > view->nlines - 3) {
8077 				err = offset_selection_down(view);
8078 				if (err)
8079 					break;
8080 			}
8081 			free(parent);
8082 		} else if (S_ISDIR(got_tree_entry_get_mode(
8083 		    s->selected_entry))) {
8084 			struct got_tree_object *subtree;
8085 			view->count = 0;
8086 			err = got_object_open_as_tree(&subtree, s->repo,
8087 			    got_tree_entry_get_id(s->selected_entry));
8088 			if (err)
8089 				break;
8090 			err = tree_view_visit_subtree(s, subtree);
8091 			if (err) {
8092 				got_object_tree_close(subtree);
8093 				break;
8094 			}
8095 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8096 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8097 		break;
8098 	case KEY_RESIZE:
8099 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8100 			s->selected = view->nlines - 4;
8101 		view->count = 0;
8102 		break;
8103 	default:
8104 		view->count = 0;
8105 		break;
8106 	}
8107 
8108 	return err;
8109 }
8110 
8111 __dead static void
8112 usage_tree(void)
8113 {
8114 	endwin();
8115 	fprintf(stderr,
8116 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8117 	    getprogname());
8118 	exit(1);
8119 }
8120 
8121 static const struct got_error *
8122 cmd_tree(int argc, char *argv[])
8123 {
8124 	const struct got_error *error;
8125 	struct got_repository *repo = NULL;
8126 	struct got_worktree *worktree = NULL;
8127 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8128 	struct got_object_id *commit_id = NULL;
8129 	struct got_commit_object *commit = NULL;
8130 	const char *commit_id_arg = NULL;
8131 	char *keyword_idstr = NULL, *label = NULL;
8132 	struct got_reference *ref = NULL;
8133 	const char *head_ref_name = NULL;
8134 	int ch;
8135 	struct tog_view *view;
8136 	int *pack_fds = NULL;
8137 
8138 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8139 		switch (ch) {
8140 		case 'c':
8141 			commit_id_arg = optarg;
8142 			break;
8143 		case 'r':
8144 			repo_path = realpath(optarg, NULL);
8145 			if (repo_path == NULL)
8146 				return got_error_from_errno2("realpath",
8147 				    optarg);
8148 			break;
8149 		default:
8150 			usage_tree();
8151 			/* NOTREACHED */
8152 		}
8153 	}
8154 
8155 	argc -= optind;
8156 	argv += optind;
8157 
8158 	if (argc > 1)
8159 		usage_tree();
8160 
8161 	error = got_repo_pack_fds_open(&pack_fds);
8162 	if (error != NULL)
8163 		goto done;
8164 
8165 	if (repo_path == NULL) {
8166 		cwd = getcwd(NULL, 0);
8167 		if (cwd == NULL)
8168 			return got_error_from_errno("getcwd");
8169 		error = got_worktree_open(&worktree, cwd, NULL);
8170 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8171 			goto done;
8172 		if (worktree)
8173 			repo_path =
8174 			    strdup(got_worktree_get_repo_path(worktree));
8175 		else
8176 			repo_path = strdup(cwd);
8177 		if (repo_path == NULL) {
8178 			error = got_error_from_errno("strdup");
8179 			goto done;
8180 		}
8181 	}
8182 
8183 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8184 	if (error != NULL)
8185 		goto done;
8186 
8187 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8188 	    repo, worktree);
8189 	if (error)
8190 		goto done;
8191 
8192 	init_curses();
8193 
8194 	error = apply_unveil(got_repo_get_path(repo), NULL);
8195 	if (error)
8196 		goto done;
8197 
8198 	error = tog_load_refs(repo, 0);
8199 	if (error)
8200 		goto done;
8201 
8202 	if (commit_id_arg == NULL) {
8203 		error = got_repo_match_object_id(&commit_id, &label,
8204 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8205 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8206 		if (error)
8207 			goto done;
8208 		head_ref_name = label;
8209 	} else {
8210 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8211 		    repo, worktree);
8212 		if (error != NULL)
8213 			goto done;
8214 		if (keyword_idstr != NULL)
8215 			commit_id_arg = keyword_idstr;
8216 
8217 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8218 		if (error == NULL)
8219 			head_ref_name = got_ref_get_name(ref);
8220 		else if (error->code != GOT_ERR_NOT_REF)
8221 			goto done;
8222 		error = got_repo_match_object_id(&commit_id, NULL,
8223 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8224 		if (error)
8225 			goto done;
8226 	}
8227 
8228 	error = got_object_open_as_commit(&commit, repo, commit_id);
8229 	if (error)
8230 		goto done;
8231 
8232 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8233 	if (view == NULL) {
8234 		error = got_error_from_errno("view_open");
8235 		goto done;
8236 	}
8237 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8238 	if (error)
8239 		goto done;
8240 	if (!got_path_is_root_dir(in_repo_path)) {
8241 		error = tree_view_walk_path(&view->state.tree, commit,
8242 		    in_repo_path);
8243 		if (error)
8244 			goto done;
8245 	}
8246 
8247 	if (worktree) {
8248 		error = set_tog_base_commit(repo, worktree);
8249 		if (error != NULL)
8250 			goto done;
8251 
8252 		/* Release work tree lock. */
8253 		got_worktree_close(worktree);
8254 		worktree = NULL;
8255 	}
8256 
8257 	error = view_loop(view);
8258 
8259 done:
8260 	free(tog_base_commit.id);
8261 	free(keyword_idstr);
8262 	free(repo_path);
8263 	free(cwd);
8264 	free(commit_id);
8265 	free(label);
8266 	if (ref)
8267 		got_ref_close(ref);
8268 	if (worktree != NULL)
8269 		got_worktree_close(worktree);
8270 	if (repo) {
8271 		const struct got_error *close_err = got_repo_close(repo);
8272 		if (error == NULL)
8273 			error = close_err;
8274 	}
8275 	if (pack_fds) {
8276 		const struct got_error *pack_err =
8277 		    got_repo_pack_fds_close(pack_fds);
8278 		if (error == NULL)
8279 			error = pack_err;
8280 	}
8281 	tog_free_refs();
8282 	return error;
8283 }
8284 
8285 static const struct got_error *
8286 ref_view_load_refs(struct tog_ref_view_state *s)
8287 {
8288 	struct got_reflist_entry *sre;
8289 	struct tog_reflist_entry *re;
8290 
8291 	s->nrefs = 0;
8292 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8293 		if (strncmp(got_ref_get_name(sre->ref),
8294 		    "refs/got/", 9) == 0 &&
8295 		    strncmp(got_ref_get_name(sre->ref),
8296 		    "refs/got/backup/", 16) != 0)
8297 			continue;
8298 
8299 		re = malloc(sizeof(*re));
8300 		if (re == NULL)
8301 			return got_error_from_errno("malloc");
8302 
8303 		re->ref = got_ref_dup(sre->ref);
8304 		if (re->ref == NULL)
8305 			return got_error_from_errno("got_ref_dup");
8306 		re->idx = s->nrefs++;
8307 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8308 	}
8309 
8310 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8311 	return NULL;
8312 }
8313 
8314 static void
8315 ref_view_free_refs(struct tog_ref_view_state *s)
8316 {
8317 	struct tog_reflist_entry *re;
8318 
8319 	while (!TAILQ_EMPTY(&s->refs)) {
8320 		re = TAILQ_FIRST(&s->refs);
8321 		TAILQ_REMOVE(&s->refs, re, entry);
8322 		got_ref_close(re->ref);
8323 		free(re);
8324 	}
8325 }
8326 
8327 static const struct got_error *
8328 open_ref_view(struct tog_view *view, struct got_repository *repo)
8329 {
8330 	const struct got_error *err = NULL;
8331 	struct tog_ref_view_state *s = &view->state.ref;
8332 
8333 	s->selected_entry = 0;
8334 	s->repo = repo;
8335 
8336 	TAILQ_INIT(&s->refs);
8337 	STAILQ_INIT(&s->colors);
8338 
8339 	err = ref_view_load_refs(s);
8340 	if (err)
8341 		goto done;
8342 
8343 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8344 		err = add_color(&s->colors, "^refs/heads/",
8345 		    TOG_COLOR_REFS_HEADS,
8346 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8347 		if (err)
8348 			goto done;
8349 
8350 		err = add_color(&s->colors, "^refs/tags/",
8351 		    TOG_COLOR_REFS_TAGS,
8352 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8353 		if (err)
8354 			goto done;
8355 
8356 		err = add_color(&s->colors, "^refs/remotes/",
8357 		    TOG_COLOR_REFS_REMOTES,
8358 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8359 		if (err)
8360 			goto done;
8361 
8362 		err = add_color(&s->colors, "^refs/got/backup/",
8363 		    TOG_COLOR_REFS_BACKUP,
8364 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8365 		if (err)
8366 			goto done;
8367 	}
8368 
8369 	view->show = show_ref_view;
8370 	view->input = input_ref_view;
8371 	view->close = close_ref_view;
8372 	view->search_start = search_start_ref_view;
8373 	view->search_next = search_next_ref_view;
8374 done:
8375 	if (err) {
8376 		if (view->close == NULL)
8377 			close_ref_view(view);
8378 		view_close(view);
8379 	}
8380 	return err;
8381 }
8382 
8383 static const struct got_error *
8384 close_ref_view(struct tog_view *view)
8385 {
8386 	struct tog_ref_view_state *s = &view->state.ref;
8387 
8388 	ref_view_free_refs(s);
8389 	free_colors(&s->colors);
8390 
8391 	return NULL;
8392 }
8393 
8394 static const struct got_error *
8395 resolve_reflist_entry(struct got_object_id **commit_id,
8396     struct tog_reflist_entry *re, struct got_repository *repo)
8397 {
8398 	const struct got_error *err = NULL;
8399 	struct got_object_id *obj_id;
8400 	struct got_tag_object *tag = NULL;
8401 	int obj_type;
8402 
8403 	*commit_id = NULL;
8404 
8405 	err = got_ref_resolve(&obj_id, repo, re->ref);
8406 	if (err)
8407 		return err;
8408 
8409 	err = got_object_get_type(&obj_type, repo, obj_id);
8410 	if (err)
8411 		goto done;
8412 
8413 	switch (obj_type) {
8414 	case GOT_OBJ_TYPE_COMMIT:
8415 		*commit_id = obj_id;
8416 		break;
8417 	case GOT_OBJ_TYPE_TAG:
8418 		err = got_object_open_as_tag(&tag, repo, obj_id);
8419 		if (err)
8420 			goto done;
8421 		free(obj_id);
8422 		err = got_object_get_type(&obj_type, repo,
8423 		    got_object_tag_get_object_id(tag));
8424 		if (err)
8425 			goto done;
8426 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8427 			err = got_error(GOT_ERR_OBJ_TYPE);
8428 			goto done;
8429 		}
8430 		*commit_id = got_object_id_dup(
8431 		    got_object_tag_get_object_id(tag));
8432 		if (*commit_id == NULL) {
8433 			err = got_error_from_errno("got_object_id_dup");
8434 			goto done;
8435 		}
8436 		break;
8437 	default:
8438 		err = got_error(GOT_ERR_OBJ_TYPE);
8439 		break;
8440 	}
8441 
8442 done:
8443 	if (tag)
8444 		got_object_tag_close(tag);
8445 	if (err) {
8446 		free(*commit_id);
8447 		*commit_id = NULL;
8448 	}
8449 	return err;
8450 }
8451 
8452 static const struct got_error *
8453 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8454     struct tog_reflist_entry *re, struct got_repository *repo)
8455 {
8456 	struct tog_view *log_view;
8457 	const struct got_error *err = NULL;
8458 	struct got_object_id *commit_id = NULL;
8459 
8460 	*new_view = NULL;
8461 
8462 	err = resolve_reflist_entry(&commit_id, re, repo);
8463 	if (err) {
8464 		if (err->code != GOT_ERR_OBJ_TYPE)
8465 			return err;
8466 		else
8467 			return NULL;
8468 	}
8469 
8470 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8471 	if (log_view == NULL) {
8472 		err = got_error_from_errno("view_open");
8473 		goto done;
8474 	}
8475 
8476 	err = open_log_view(log_view, commit_id, repo,
8477 	    got_ref_get_name(re->ref), "", 0);
8478 done:
8479 	if (err)
8480 		view_close(log_view);
8481 	else
8482 		*new_view = log_view;
8483 	free(commit_id);
8484 	return err;
8485 }
8486 
8487 static void
8488 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8489 {
8490 	struct tog_reflist_entry *re;
8491 	int i = 0;
8492 
8493 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8494 		return;
8495 
8496 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8497 	while (i++ < maxscroll) {
8498 		if (re == NULL)
8499 			break;
8500 		s->first_displayed_entry = re;
8501 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8502 	}
8503 }
8504 
8505 static const struct got_error *
8506 ref_scroll_down(struct tog_view *view, int maxscroll)
8507 {
8508 	struct tog_ref_view_state *s = &view->state.ref;
8509 	struct tog_reflist_entry *next, *last;
8510 	int n = 0;
8511 
8512 	if (s->first_displayed_entry)
8513 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8514 	else
8515 		next = TAILQ_FIRST(&s->refs);
8516 
8517 	last = s->last_displayed_entry;
8518 	while (next && n++ < maxscroll) {
8519 		if (last) {
8520 			s->last_displayed_entry = last;
8521 			last = TAILQ_NEXT(last, entry);
8522 		}
8523 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8524 			s->first_displayed_entry = next;
8525 			next = TAILQ_NEXT(next, entry);
8526 		}
8527 	}
8528 
8529 	return NULL;
8530 }
8531 
8532 static const struct got_error *
8533 search_start_ref_view(struct tog_view *view)
8534 {
8535 	struct tog_ref_view_state *s = &view->state.ref;
8536 
8537 	s->matched_entry = NULL;
8538 	return NULL;
8539 }
8540 
8541 static int
8542 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8543 {
8544 	regmatch_t regmatch;
8545 
8546 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8547 	    0) == 0;
8548 }
8549 
8550 static const struct got_error *
8551 search_next_ref_view(struct tog_view *view)
8552 {
8553 	struct tog_ref_view_state *s = &view->state.ref;
8554 	struct tog_reflist_entry *re = NULL;
8555 
8556 	if (!view->searching) {
8557 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8558 		return NULL;
8559 	}
8560 
8561 	if (s->matched_entry) {
8562 		if (view->searching == TOG_SEARCH_FORWARD) {
8563 			if (s->selected_entry)
8564 				re = TAILQ_NEXT(s->selected_entry, entry);
8565 			else
8566 				re = TAILQ_PREV(s->selected_entry,
8567 				    tog_reflist_head, entry);
8568 		} else {
8569 			if (s->selected_entry == NULL)
8570 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8571 			else
8572 				re = TAILQ_PREV(s->selected_entry,
8573 				    tog_reflist_head, entry);
8574 		}
8575 	} else {
8576 		if (s->selected_entry)
8577 			re = s->selected_entry;
8578 		else if (view->searching == TOG_SEARCH_FORWARD)
8579 			re = TAILQ_FIRST(&s->refs);
8580 		else
8581 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8582 	}
8583 
8584 	while (1) {
8585 		if (re == NULL) {
8586 			if (s->matched_entry == NULL) {
8587 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8588 				return NULL;
8589 			}
8590 			if (view->searching == TOG_SEARCH_FORWARD)
8591 				re = TAILQ_FIRST(&s->refs);
8592 			else
8593 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8594 		}
8595 
8596 		if (match_reflist_entry(re, &view->regex)) {
8597 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8598 			s->matched_entry = re;
8599 			break;
8600 		}
8601 
8602 		if (view->searching == TOG_SEARCH_FORWARD)
8603 			re = TAILQ_NEXT(re, entry);
8604 		else
8605 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8606 	}
8607 
8608 	if (s->matched_entry) {
8609 		s->first_displayed_entry = s->matched_entry;
8610 		s->selected = 0;
8611 	}
8612 
8613 	return NULL;
8614 }
8615 
8616 static const struct got_error *
8617 show_ref_view(struct tog_view *view)
8618 {
8619 	const struct got_error *err = NULL;
8620 	struct tog_ref_view_state *s = &view->state.ref;
8621 	struct tog_reflist_entry *re;
8622 	char *line = NULL;
8623 	wchar_t *wline;
8624 	struct tog_color *tc;
8625 	int width, n, scrollx;
8626 	int limit = view->nlines;
8627 
8628 	werase(view->window);
8629 
8630 	s->ndisplayed = 0;
8631 	if (view_is_hsplit_top(view))
8632 		--limit;  /* border */
8633 
8634 	if (limit == 0)
8635 		return NULL;
8636 
8637 	re = s->first_displayed_entry;
8638 
8639 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8640 	    s->nrefs) == -1)
8641 		return got_error_from_errno("asprintf");
8642 
8643 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8644 	if (err) {
8645 		free(line);
8646 		return err;
8647 	}
8648 	if (view_needs_focus_indication(view))
8649 		wstandout(view->window);
8650 	waddwstr(view->window, wline);
8651 	while (width++ < view->ncols)
8652 		waddch(view->window, ' ');
8653 	if (view_needs_focus_indication(view))
8654 		wstandend(view->window);
8655 	free(wline);
8656 	wline = NULL;
8657 	free(line);
8658 	line = NULL;
8659 	if (--limit <= 0)
8660 		return NULL;
8661 
8662 	n = 0;
8663 	view->maxx = 0;
8664 	while (re && limit > 0) {
8665 		char *line = NULL;
8666 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8667 
8668 		if (s->show_date) {
8669 			struct got_commit_object *ci;
8670 			struct got_tag_object *tag;
8671 			struct got_object_id *id;
8672 			struct tm tm;
8673 			time_t t;
8674 
8675 			err = got_ref_resolve(&id, s->repo, re->ref);
8676 			if (err)
8677 				return err;
8678 			err = got_object_open_as_tag(&tag, s->repo, id);
8679 			if (err) {
8680 				if (err->code != GOT_ERR_OBJ_TYPE) {
8681 					free(id);
8682 					return err;
8683 				}
8684 				err = got_object_open_as_commit(&ci, s->repo,
8685 				    id);
8686 				if (err) {
8687 					free(id);
8688 					return err;
8689 				}
8690 				t = got_object_commit_get_committer_time(ci);
8691 				got_object_commit_close(ci);
8692 			} else {
8693 				t = got_object_tag_get_tagger_time(tag);
8694 				got_object_tag_close(tag);
8695 			}
8696 			free(id);
8697 			if (gmtime_r(&t, &tm) == NULL)
8698 				return got_error_from_errno("gmtime_r");
8699 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8700 				return got_error(GOT_ERR_NO_SPACE);
8701 		}
8702 		if (got_ref_is_symbolic(re->ref)) {
8703 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8704 			    ymd : "", got_ref_get_name(re->ref),
8705 			    got_ref_get_symref_target(re->ref)) == -1)
8706 				return got_error_from_errno("asprintf");
8707 		} else if (s->show_ids) {
8708 			struct got_object_id *id;
8709 			char *id_str;
8710 			err = got_ref_resolve(&id, s->repo, re->ref);
8711 			if (err)
8712 				return err;
8713 			err = got_object_id_str(&id_str, id);
8714 			if (err) {
8715 				free(id);
8716 				return err;
8717 			}
8718 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8719 			    got_ref_get_name(re->ref), id_str) == -1) {
8720 				err = got_error_from_errno("asprintf");
8721 				free(id);
8722 				free(id_str);
8723 				return err;
8724 			}
8725 			free(id);
8726 			free(id_str);
8727 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8728 		    got_ref_get_name(re->ref)) == -1)
8729 			return got_error_from_errno("asprintf");
8730 
8731 		/* use full line width to determine view->maxx */
8732 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8733 		if (err) {
8734 			free(line);
8735 			return err;
8736 		}
8737 		view->maxx = MAX(view->maxx, width);
8738 		free(wline);
8739 		wline = NULL;
8740 
8741 		err = format_line(&wline, &width, &scrollx, line, view->x,
8742 		    view->ncols, 0, 0);
8743 		if (err) {
8744 			free(line);
8745 			return err;
8746 		}
8747 		if (n == s->selected) {
8748 			if (view->focussed)
8749 				wstandout(view->window);
8750 			s->selected_entry = re;
8751 		}
8752 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8753 		if (tc)
8754 			wattr_on(view->window,
8755 			    COLOR_PAIR(tc->colorpair), NULL);
8756 		waddwstr(view->window, &wline[scrollx]);
8757 		if (tc)
8758 			wattr_off(view->window,
8759 			    COLOR_PAIR(tc->colorpair), NULL);
8760 		if (width < view->ncols)
8761 			waddch(view->window, '\n');
8762 		if (n == s->selected && view->focussed)
8763 			wstandend(view->window);
8764 		free(line);
8765 		free(wline);
8766 		wline = NULL;
8767 		n++;
8768 		s->ndisplayed++;
8769 		s->last_displayed_entry = re;
8770 
8771 		limit--;
8772 		re = TAILQ_NEXT(re, entry);
8773 	}
8774 
8775 	view_border(view);
8776 	return err;
8777 }
8778 
8779 static const struct got_error *
8780 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8781     struct tog_reflist_entry *re, struct got_repository *repo)
8782 {
8783 	const struct got_error *err = NULL;
8784 	struct got_object_id *commit_id = NULL;
8785 	struct tog_view *tree_view;
8786 
8787 	*new_view = NULL;
8788 
8789 	err = resolve_reflist_entry(&commit_id, re, repo);
8790 	if (err) {
8791 		if (err->code != GOT_ERR_OBJ_TYPE)
8792 			return err;
8793 		else
8794 			return NULL;
8795 	}
8796 
8797 
8798 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8799 	if (tree_view == NULL) {
8800 		err = got_error_from_errno("view_open");
8801 		goto done;
8802 	}
8803 
8804 	err = open_tree_view(tree_view, commit_id,
8805 	    got_ref_get_name(re->ref), repo);
8806 	if (err)
8807 		goto done;
8808 
8809 	*new_view = tree_view;
8810 done:
8811 	free(commit_id);
8812 	return err;
8813 }
8814 
8815 static const struct got_error *
8816 ref_goto_line(struct tog_view *view, int nlines)
8817 {
8818 	const struct got_error		*err = NULL;
8819 	struct tog_ref_view_state	*s = &view->state.ref;
8820 	int				 g, idx = s->selected_entry->idx;
8821 
8822 	g = view->gline;
8823 	view->gline = 0;
8824 
8825 	if (g == 0)
8826 		g = 1;
8827 	else if (g > s->nrefs)
8828 		g = s->nrefs;
8829 
8830 	if (g >= s->first_displayed_entry->idx + 1 &&
8831 	    g <= s->last_displayed_entry->idx + 1 &&
8832 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8833 		s->selected = g - s->first_displayed_entry->idx - 1;
8834 		return NULL;
8835 	}
8836 
8837 	if (idx + 1 < g) {
8838 		err = ref_scroll_down(view, g - idx - 1);
8839 		if (err)
8840 			return err;
8841 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8842 		    s->first_displayed_entry->idx + s->selected < g &&
8843 		    s->selected < s->ndisplayed - 1)
8844 			s->selected = g - s->first_displayed_entry->idx - 1;
8845 	} else if (idx + 1 > g)
8846 		ref_scroll_up(s, idx - g + 1);
8847 
8848 	if (g < nlines && s->first_displayed_entry->idx == 0)
8849 		s->selected = g - 1;
8850 
8851 	return NULL;
8852 
8853 }
8854 
8855 static const struct got_error *
8856 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8857 {
8858 	const struct got_error *err = NULL;
8859 	struct tog_ref_view_state *s = &view->state.ref;
8860 	struct tog_reflist_entry *re;
8861 	int n, nscroll = view->nlines - 1;
8862 
8863 	if (view->gline)
8864 		return ref_goto_line(view, nscroll);
8865 
8866 	switch (ch) {
8867 	case '0':
8868 	case '$':
8869 	case KEY_RIGHT:
8870 	case 'l':
8871 	case KEY_LEFT:
8872 	case 'h':
8873 		horizontal_scroll_input(view, ch);
8874 		break;
8875 	case 'i':
8876 		s->show_ids = !s->show_ids;
8877 		view->count = 0;
8878 		break;
8879 	case 'm':
8880 		s->show_date = !s->show_date;
8881 		view->count = 0;
8882 		break;
8883 	case 'o':
8884 		s->sort_by_date = !s->sort_by_date;
8885 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8886 		view->count = 0;
8887 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8888 		    got_ref_cmp_by_commit_timestamp_descending :
8889 		    tog_ref_cmp_by_name, s->repo);
8890 		if (err)
8891 			break;
8892 		got_reflist_object_id_map_free(tog_refs_idmap);
8893 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8894 		    &tog_refs, s->repo);
8895 		if (err)
8896 			break;
8897 		ref_view_free_refs(s);
8898 		err = ref_view_load_refs(s);
8899 		break;
8900 	case KEY_ENTER:
8901 	case '\r':
8902 		view->count = 0;
8903 		if (!s->selected_entry)
8904 			break;
8905 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8906 		break;
8907 	case 'T':
8908 		view->count = 0;
8909 		if (!s->selected_entry)
8910 			break;
8911 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8912 		break;
8913 	case 'g':
8914 	case '=':
8915 	case KEY_HOME:
8916 		s->selected = 0;
8917 		view->count = 0;
8918 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8919 		break;
8920 	case 'G':
8921 	case '*':
8922 	case KEY_END: {
8923 		int eos = view->nlines - 1;
8924 
8925 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8926 			--eos;  /* border */
8927 		s->selected = 0;
8928 		view->count = 0;
8929 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8930 		for (n = 0; n < eos; n++) {
8931 			if (re == NULL)
8932 				break;
8933 			s->first_displayed_entry = re;
8934 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8935 		}
8936 		if (n > 0)
8937 			s->selected = n - 1;
8938 		break;
8939 	}
8940 	case 'k':
8941 	case KEY_UP:
8942 	case CTRL('p'):
8943 		if (s->selected > 0) {
8944 			s->selected--;
8945 			break;
8946 		}
8947 		ref_scroll_up(s, 1);
8948 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8949 			view->count = 0;
8950 		break;
8951 	case CTRL('u'):
8952 	case 'u':
8953 		nscroll /= 2;
8954 		/* FALL THROUGH */
8955 	case KEY_PPAGE:
8956 	case CTRL('b'):
8957 	case 'b':
8958 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8959 			s->selected -= MIN(nscroll, s->selected);
8960 		ref_scroll_up(s, MAX(0, nscroll));
8961 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8962 			view->count = 0;
8963 		break;
8964 	case 'j':
8965 	case KEY_DOWN:
8966 	case CTRL('n'):
8967 		if (s->selected < s->ndisplayed - 1) {
8968 			s->selected++;
8969 			break;
8970 		}
8971 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8972 			/* can't scroll any further */
8973 			view->count = 0;
8974 			break;
8975 		}
8976 		ref_scroll_down(view, 1);
8977 		break;
8978 	case CTRL('d'):
8979 	case 'd':
8980 		nscroll /= 2;
8981 		/* FALL THROUGH */
8982 	case KEY_NPAGE:
8983 	case CTRL('f'):
8984 	case 'f':
8985 	case ' ':
8986 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8987 			/* can't scroll any further; move cursor down */
8988 			if (s->selected < s->ndisplayed - 1)
8989 				s->selected += MIN(nscroll,
8990 				    s->ndisplayed - s->selected - 1);
8991 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8992 				s->selected += s->ndisplayed - s->selected - 1;
8993 			view->count = 0;
8994 			break;
8995 		}
8996 		ref_scroll_down(view, nscroll);
8997 		break;
8998 	case CTRL('l'):
8999 		view->count = 0;
9000 		tog_free_refs();
9001 		err = tog_load_refs(s->repo, s->sort_by_date);
9002 		if (err)
9003 			break;
9004 		ref_view_free_refs(s);
9005 		err = ref_view_load_refs(s);
9006 		break;
9007 	case KEY_RESIZE:
9008 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
9009 			s->selected = view->nlines - 2;
9010 		break;
9011 	default:
9012 		view->count = 0;
9013 		break;
9014 	}
9015 
9016 	return err;
9017 }
9018 
9019 __dead static void
9020 usage_ref(void)
9021 {
9022 	endwin();
9023 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
9024 	    getprogname());
9025 	exit(1);
9026 }
9027 
9028 static const struct got_error *
9029 cmd_ref(int argc, char *argv[])
9030 {
9031 	const struct got_error *error;
9032 	struct got_repository *repo = NULL;
9033 	struct got_worktree *worktree = NULL;
9034 	char *cwd = NULL, *repo_path = NULL;
9035 	int ch;
9036 	struct tog_view *view;
9037 	int *pack_fds = NULL;
9038 
9039 	while ((ch = getopt(argc, argv, "r:")) != -1) {
9040 		switch (ch) {
9041 		case 'r':
9042 			repo_path = realpath(optarg, NULL);
9043 			if (repo_path == NULL)
9044 				return got_error_from_errno2("realpath",
9045 				    optarg);
9046 			break;
9047 		default:
9048 			usage_ref();
9049 			/* NOTREACHED */
9050 		}
9051 	}
9052 
9053 	argc -= optind;
9054 	argv += optind;
9055 
9056 	if (argc > 1)
9057 		usage_ref();
9058 
9059 	error = got_repo_pack_fds_open(&pack_fds);
9060 	if (error != NULL)
9061 		goto done;
9062 
9063 	if (repo_path == NULL) {
9064 		cwd = getcwd(NULL, 0);
9065 		if (cwd == NULL)
9066 			return got_error_from_errno("getcwd");
9067 		error = got_worktree_open(&worktree, cwd, NULL);
9068 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9069 			goto done;
9070 		if (worktree)
9071 			repo_path =
9072 			    strdup(got_worktree_get_repo_path(worktree));
9073 		else
9074 			repo_path = strdup(cwd);
9075 		if (repo_path == NULL) {
9076 			error = got_error_from_errno("strdup");
9077 			goto done;
9078 		}
9079 	}
9080 
9081 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9082 	if (error != NULL)
9083 		goto done;
9084 
9085 	init_curses();
9086 
9087 	error = apply_unveil(got_repo_get_path(repo), NULL);
9088 	if (error)
9089 		goto done;
9090 
9091 	error = tog_load_refs(repo, 0);
9092 	if (error)
9093 		goto done;
9094 
9095 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9096 	if (view == NULL) {
9097 		error = got_error_from_errno("view_open");
9098 		goto done;
9099 	}
9100 
9101 	error = open_ref_view(view, repo);
9102 	if (error)
9103 		goto done;
9104 
9105 	if (worktree) {
9106 		error = set_tog_base_commit(repo, worktree);
9107 		if (error != NULL)
9108 			goto done;
9109 
9110 		/* Release work tree lock. */
9111 		got_worktree_close(worktree);
9112 		worktree = NULL;
9113 	}
9114 
9115 	error = view_loop(view);
9116 
9117 done:
9118 	free(tog_base_commit.id);
9119 	free(repo_path);
9120 	free(cwd);
9121 	if (worktree != NULL)
9122 		got_worktree_close(worktree);
9123 	if (repo) {
9124 		const struct got_error *close_err = got_repo_close(repo);
9125 		if (close_err)
9126 			error = close_err;
9127 	}
9128 	if (pack_fds) {
9129 		const struct got_error *pack_err =
9130 		    got_repo_pack_fds_close(pack_fds);
9131 		if (error == NULL)
9132 			error = pack_err;
9133 	}
9134 	tog_free_refs();
9135 	return error;
9136 }
9137 
9138 static const struct got_error*
9139 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9140     const char *str)
9141 {
9142 	size_t len;
9143 
9144 	if (win == NULL)
9145 		win = stdscr;
9146 
9147 	len = strlen(str);
9148 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9149 
9150 	if (focus)
9151 		wstandout(win);
9152 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9153 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9154 	if (focus)
9155 		wstandend(win);
9156 
9157 	return NULL;
9158 }
9159 
9160 static const struct got_error *
9161 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9162 {
9163 	off_t *p;
9164 
9165 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9166 	if (p == NULL) {
9167 		free(*line_offsets);
9168 		*line_offsets = NULL;
9169 		return got_error_from_errno("reallocarray");
9170 	}
9171 
9172 	*line_offsets = p;
9173 	(*line_offsets)[*nlines] = off;
9174 	++(*nlines);
9175 	return NULL;
9176 }
9177 
9178 static const struct got_error *
9179 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9180 {
9181 	*ret = 0;
9182 
9183 	for (;n > 0; --n, ++km) {
9184 		char	*t0, *t, *k;
9185 		size_t	 len = 1;
9186 
9187 		if (km->keys == NULL)
9188 			continue;
9189 
9190 		t = t0 = strdup(km->keys);
9191 		if (t0 == NULL)
9192 			return got_error_from_errno("strdup");
9193 
9194 		len += strlen(t);
9195 		while ((k = strsep(&t, " ")) != NULL)
9196 			len += strlen(k) > 1 ? 2 : 0;
9197 		free(t0);
9198 		*ret = MAX(*ret, len);
9199 	}
9200 
9201 	return NULL;
9202 }
9203 
9204 /*
9205  * Write keymap section headers, keys, and key info in km to f.
9206  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9207  * wrap control and symbolic keys in guillemets, else use <>.
9208  */
9209 static const struct got_error *
9210 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9211 {
9212 	int n, len = width;
9213 
9214 	if (km->keys) {
9215 		static const char *u8_glyph[] = {
9216 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9217 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9218 		};
9219 		char	*t0, *t, *k;
9220 		int	 cs, s, first = 1;
9221 
9222 		cs = got_locale_is_utf8();
9223 
9224 		t = t0 = strdup(km->keys);
9225 		if (t0 == NULL)
9226 			return got_error_from_errno("strdup");
9227 
9228 		len = strlen(km->keys);
9229 		while ((k = strsep(&t, " ")) != NULL) {
9230 			s = strlen(k) > 1;  /* control or symbolic key */
9231 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9232 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9233 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9234 			if (n < 0) {
9235 				free(t0);
9236 				return got_error_from_errno("fprintf");
9237 			}
9238 			first = 0;
9239 			len += s ? 2 : 0;
9240 			*off += n;
9241 		}
9242 		free(t0);
9243 	}
9244 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9245 	if (n < 0)
9246 		return got_error_from_errno("fprintf");
9247 	*off += n;
9248 
9249 	return NULL;
9250 }
9251 
9252 static const struct got_error *
9253 format_help(struct tog_help_view_state *s)
9254 {
9255 	const struct got_error		*err = NULL;
9256 	off_t				 off = 0;
9257 	int				 i, max, n, show = s->all;
9258 	static const struct tog_key_map	 km[] = {
9259 #define KEYMAP_(info, type)	{ NULL, (info), type }
9260 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9261 		GENERATE_HELP
9262 #undef KEYMAP_
9263 #undef KEY_
9264 	};
9265 
9266 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9267 	if (err)
9268 		return err;
9269 
9270 	n = nitems(km);
9271 	err = max_key_str(&max, km, n);
9272 	if (err)
9273 		return err;
9274 
9275 	for (i = 0; i < n; ++i) {
9276 		if (km[i].keys == NULL) {
9277 			show = s->all;
9278 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9279 			    km[i].type == s->type || s->all)
9280 				show = 1;
9281 		}
9282 		if (show) {
9283 			err = format_help_line(&off, s->f, &km[i], max);
9284 			if (err)
9285 				return err;
9286 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9287 			if (err)
9288 				return err;
9289 		}
9290 	}
9291 	fputc('\n', s->f);
9292 	++off;
9293 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9294 	return err;
9295 }
9296 
9297 static const struct got_error *
9298 create_help(struct tog_help_view_state *s)
9299 {
9300 	FILE			*f;
9301 	const struct got_error	*err;
9302 
9303 	free(s->line_offsets);
9304 	s->line_offsets = NULL;
9305 	s->nlines = 0;
9306 
9307 	f = got_opentemp();
9308 	if (f == NULL)
9309 		return got_error_from_errno("got_opentemp");
9310 	s->f = f;
9311 
9312 	err = format_help(s);
9313 	if (err)
9314 		return err;
9315 
9316 	if (s->f && fflush(s->f) != 0)
9317 		return got_error_from_errno("fflush");
9318 
9319 	return NULL;
9320 }
9321 
9322 static const struct got_error *
9323 search_start_help_view(struct tog_view *view)
9324 {
9325 	view->state.help.matched_line = 0;
9326 	return NULL;
9327 }
9328 
9329 static void
9330 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9331     size_t *nlines, int **first, int **last, int **match, int **selected)
9332 {
9333 	struct tog_help_view_state *s = &view->state.help;
9334 
9335 	*f = s->f;
9336 	*nlines = s->nlines;
9337 	*line_offsets = s->line_offsets;
9338 	*match = &s->matched_line;
9339 	*first = &s->first_displayed_line;
9340 	*last = &s->last_displayed_line;
9341 	*selected = &s->selected_line;
9342 }
9343 
9344 static const struct got_error *
9345 show_help_view(struct tog_view *view)
9346 {
9347 	struct tog_help_view_state	*s = &view->state.help;
9348 	const struct got_error		*err;
9349 	regmatch_t			*regmatch = &view->regmatch;
9350 	wchar_t				*wline;
9351 	char				*line;
9352 	ssize_t				 linelen;
9353 	size_t				 linesz = 0;
9354 	int				 width, nprinted = 0, rc = 0;
9355 	int				 eos = view->nlines;
9356 
9357 	if (view_is_hsplit_top(view))
9358 		--eos;  /* account for border */
9359 
9360 	s->lineno = 0;
9361 	rewind(s->f);
9362 	werase(view->window);
9363 
9364 	if (view->gline > s->nlines - 1)
9365 		view->gline = s->nlines - 1;
9366 
9367 	err = win_draw_center(view->window, 0, 0, view->ncols,
9368 	    view_needs_focus_indication(view),
9369 	    "tog help (press q to return to tog)");
9370 	if (err)
9371 		return err;
9372 	if (eos <= 1)
9373 		return NULL;
9374 	waddstr(view->window, "\n\n");
9375 	eos -= 2;
9376 
9377 	s->eof = 0;
9378 	view->maxx = 0;
9379 	line = NULL;
9380 	while (eos > 0 && nprinted < eos) {
9381 		attr_t attr = 0;
9382 
9383 		linelen = getline(&line, &linesz, s->f);
9384 		if (linelen == -1) {
9385 			if (!feof(s->f)) {
9386 				free(line);
9387 				return got_ferror(s->f, GOT_ERR_IO);
9388 			}
9389 			s->eof = 1;
9390 			break;
9391 		}
9392 		if (++s->lineno < s->first_displayed_line)
9393 			continue;
9394 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9395 			continue;
9396 		if (s->lineno == view->hiline)
9397 			attr = A_STANDOUT;
9398 
9399 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9400 		    view->x ? 1 : 0);
9401 		if (err) {
9402 			free(line);
9403 			return err;
9404 		}
9405 		view->maxx = MAX(view->maxx, width);
9406 		free(wline);
9407 		wline = NULL;
9408 
9409 		if (attr)
9410 			wattron(view->window, attr);
9411 		if (s->first_displayed_line + nprinted == s->matched_line &&
9412 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9413 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9414 			    view->window, view->x, regmatch);
9415 			if (err) {
9416 				free(line);
9417 				return err;
9418 			}
9419 		} else {
9420 			int skip;
9421 
9422 			err = format_line(&wline, &width, &skip, line,
9423 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9424 			if (err) {
9425 				free(line);
9426 				return err;
9427 			}
9428 			waddwstr(view->window, &wline[skip]);
9429 			free(wline);
9430 			wline = NULL;
9431 		}
9432 		if (s->lineno == view->hiline) {
9433 			while (width++ < view->ncols)
9434 				waddch(view->window, ' ');
9435 		} else {
9436 			if (width < view->ncols)
9437 				waddch(view->window, '\n');
9438 		}
9439 		if (attr)
9440 			wattroff(view->window, attr);
9441 		if (++nprinted == 1)
9442 			s->first_displayed_line = s->lineno;
9443 	}
9444 	free(line);
9445 	if (nprinted > 0)
9446 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9447 	else
9448 		s->last_displayed_line = s->first_displayed_line;
9449 
9450 	view_border(view);
9451 
9452 	if (s->eof) {
9453 		rc = waddnstr(view->window,
9454 		    "See the tog(1) manual page for full documentation",
9455 		    view->ncols - 1);
9456 		if (rc == ERR)
9457 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9458 	} else {
9459 		wmove(view->window, view->nlines - 1, 0);
9460 		wclrtoeol(view->window);
9461 		wstandout(view->window);
9462 		rc = waddnstr(view->window, "scroll down for more...",
9463 		    view->ncols - 1);
9464 		if (rc == ERR)
9465 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9466 		if (getcurx(view->window) < view->ncols - 6) {
9467 			rc = wprintw(view->window, "[%.0f%%]",
9468 			    100.00 * s->last_displayed_line / s->nlines);
9469 			if (rc == ERR)
9470 				return got_error_msg(GOT_ERR_IO, "wprintw");
9471 		}
9472 		wstandend(view->window);
9473 	}
9474 
9475 	return NULL;
9476 }
9477 
9478 static const struct got_error *
9479 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9480 {
9481 	struct tog_help_view_state	*s = &view->state.help;
9482 	const struct got_error		*err = NULL;
9483 	char				*line = NULL;
9484 	ssize_t				 linelen;
9485 	size_t				 linesz = 0;
9486 	int				 eos, nscroll;
9487 
9488 	eos = nscroll = view->nlines;
9489 	if (view_is_hsplit_top(view))
9490 		--eos;  /* border */
9491 
9492 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9493 
9494 	switch (ch) {
9495 	case '0':
9496 	case '$':
9497 	case KEY_RIGHT:
9498 	case 'l':
9499 	case KEY_LEFT:
9500 	case 'h':
9501 		horizontal_scroll_input(view, ch);
9502 		break;
9503 	case 'g':
9504 	case KEY_HOME:
9505 		s->first_displayed_line = 1;
9506 		view->count = 0;
9507 		break;
9508 	case 'G':
9509 	case KEY_END:
9510 		view->count = 0;
9511 		if (s->eof)
9512 			break;
9513 		s->first_displayed_line = (s->nlines - eos) + 3;
9514 		s->eof = 1;
9515 		break;
9516 	case 'k':
9517 	case KEY_UP:
9518 		if (s->first_displayed_line > 1)
9519 			--s->first_displayed_line;
9520 		else
9521 			view->count = 0;
9522 		break;
9523 	case CTRL('u'):
9524 	case 'u':
9525 		nscroll /= 2;
9526 		/* FALL THROUGH */
9527 	case KEY_PPAGE:
9528 	case CTRL('b'):
9529 	case 'b':
9530 		if (s->first_displayed_line == 1) {
9531 			view->count = 0;
9532 			break;
9533 		}
9534 		while (--nscroll > 0 && s->first_displayed_line > 1)
9535 			s->first_displayed_line--;
9536 		break;
9537 	case 'j':
9538 	case KEY_DOWN:
9539 	case CTRL('n'):
9540 		if (!s->eof)
9541 			++s->first_displayed_line;
9542 		else
9543 			view->count = 0;
9544 		break;
9545 	case CTRL('d'):
9546 	case 'd':
9547 		nscroll /= 2;
9548 		/* FALL THROUGH */
9549 	case KEY_NPAGE:
9550 	case CTRL('f'):
9551 	case 'f':
9552 	case ' ':
9553 		if (s->eof) {
9554 			view->count = 0;
9555 			break;
9556 		}
9557 		while (!s->eof && --nscroll > 0) {
9558 			linelen = getline(&line, &linesz, s->f);
9559 			s->first_displayed_line++;
9560 			if (linelen == -1) {
9561 				if (feof(s->f))
9562 					s->eof = 1;
9563 				else
9564 					err = got_ferror(s->f, GOT_ERR_IO);
9565 				break;
9566 			}
9567 		}
9568 		free(line);
9569 		break;
9570 	default:
9571 		view->count = 0;
9572 		break;
9573 	}
9574 
9575 	return err;
9576 }
9577 
9578 static const struct got_error *
9579 close_help_view(struct tog_view *view)
9580 {
9581 	struct tog_help_view_state *s = &view->state.help;
9582 
9583 	free(s->line_offsets);
9584 	s->line_offsets = NULL;
9585 	if (fclose(s->f) == EOF)
9586 		return got_error_from_errno("fclose");
9587 
9588 	return NULL;
9589 }
9590 
9591 static const struct got_error *
9592 reset_help_view(struct tog_view *view)
9593 {
9594 	struct tog_help_view_state *s = &view->state.help;
9595 
9596 
9597 	if (s->f && fclose(s->f) == EOF)
9598 		return got_error_from_errno("fclose");
9599 
9600 	wclear(view->window);
9601 	view->count = 0;
9602 	view->x = 0;
9603 	s->all = !s->all;
9604 	s->first_displayed_line = 1;
9605 	s->last_displayed_line = view->nlines;
9606 	s->matched_line = 0;
9607 
9608 	return create_help(s);
9609 }
9610 
9611 static const struct got_error *
9612 open_help_view(struct tog_view *view, struct tog_view *parent)
9613 {
9614 	const struct got_error		*err = NULL;
9615 	struct tog_help_view_state	*s = &view->state.help;
9616 
9617 	s->type = (enum tog_keymap_type)parent->type;
9618 	s->first_displayed_line = 1;
9619 	s->last_displayed_line = view->nlines;
9620 	s->selected_line = 1;
9621 
9622 	view->show = show_help_view;
9623 	view->input = input_help_view;
9624 	view->reset = reset_help_view;
9625 	view->close = close_help_view;
9626 	view->search_start = search_start_help_view;
9627 	view->search_setup = search_setup_help_view;
9628 	view->search_next = search_next_view_match;
9629 
9630 	err = create_help(s);
9631 	return err;
9632 }
9633 
9634 static const struct got_error *
9635 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9636     enum tog_view_type request, int y, int x)
9637 {
9638 	const struct got_error *err = NULL;
9639 
9640 	*new_view = NULL;
9641 
9642 	switch (request) {
9643 	case TOG_VIEW_DIFF:
9644 		if (view->type == TOG_VIEW_LOG) {
9645 			struct tog_log_view_state *s = &view->state.log;
9646 
9647 			err = open_diff_view_for_commit(new_view, y, x,
9648 			    s->selected_entry->commit, s->selected_entry->id,
9649 			    view, s->repo);
9650 		} else
9651 			return got_error_msg(GOT_ERR_NOT_IMPL,
9652 			    "parent/child view pair not supported");
9653 		break;
9654 	case TOG_VIEW_BLAME:
9655 		if (view->type == TOG_VIEW_TREE) {
9656 			struct tog_tree_view_state *s = &view->state.tree;
9657 
9658 			err = blame_tree_entry(new_view, y, x,
9659 			    s->selected_entry, &s->parents, s->commit_id,
9660 			    s->repo);
9661 		} else
9662 			return got_error_msg(GOT_ERR_NOT_IMPL,
9663 			    "parent/child view pair not supported");
9664 		break;
9665 	case TOG_VIEW_LOG:
9666 		if (view->type == TOG_VIEW_BLAME)
9667 			err = log_annotated_line(new_view, y, x,
9668 			    view->state.blame.repo, view->state.blame.id_to_log);
9669 		else if (view->type == TOG_VIEW_TREE)
9670 			err = log_selected_tree_entry(new_view, y, x,
9671 			    &view->state.tree);
9672 		else if (view->type == TOG_VIEW_REF)
9673 			err = log_ref_entry(new_view, y, x,
9674 			    view->state.ref.selected_entry,
9675 			    view->state.ref.repo);
9676 		else
9677 			return got_error_msg(GOT_ERR_NOT_IMPL,
9678 			    "parent/child view pair not supported");
9679 		break;
9680 	case TOG_VIEW_TREE:
9681 		if (view->type == TOG_VIEW_LOG)
9682 			err = browse_commit_tree(new_view, y, x,
9683 			    view->state.log.selected_entry,
9684 			    view->state.log.in_repo_path,
9685 			    view->state.log.head_ref_name,
9686 			    view->state.log.repo);
9687 		else if (view->type == TOG_VIEW_REF)
9688 			err = browse_ref_tree(new_view, y, x,
9689 			    view->state.ref.selected_entry,
9690 			    view->state.ref.repo);
9691 		else
9692 			return got_error_msg(GOT_ERR_NOT_IMPL,
9693 			    "parent/child view pair not supported");
9694 		break;
9695 	case TOG_VIEW_REF:
9696 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9697 		if (*new_view == NULL)
9698 			return got_error_from_errno("view_open");
9699 		if (view->type == TOG_VIEW_LOG)
9700 			err = open_ref_view(*new_view, view->state.log.repo);
9701 		else if (view->type == TOG_VIEW_TREE)
9702 			err = open_ref_view(*new_view, view->state.tree.repo);
9703 		else
9704 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9705 			    "parent/child view pair not supported");
9706 		if (err)
9707 			view_close(*new_view);
9708 		break;
9709 	case TOG_VIEW_HELP:
9710 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9711 		if (*new_view == NULL)
9712 			return got_error_from_errno("view_open");
9713 		err = open_help_view(*new_view, view);
9714 		if (err)
9715 			view_close(*new_view);
9716 		break;
9717 	default:
9718 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9719 	}
9720 
9721 	return err;
9722 }
9723 
9724 /*
9725  * If view was scrolled down to move the selected line into view when opening a
9726  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9727  */
9728 static void
9729 offset_selection_up(struct tog_view *view)
9730 {
9731 	switch (view->type) {
9732 	case TOG_VIEW_BLAME: {
9733 		struct tog_blame_view_state *s = &view->state.blame;
9734 		if (s->first_displayed_line == 1) {
9735 			s->selected_line = MAX(s->selected_line - view->offset,
9736 			    1);
9737 			break;
9738 		}
9739 		if (s->first_displayed_line > view->offset)
9740 			s->first_displayed_line -= view->offset;
9741 		else
9742 			s->first_displayed_line = 1;
9743 		s->selected_line += view->offset;
9744 		break;
9745 	}
9746 	case TOG_VIEW_LOG:
9747 		log_scroll_up(&view->state.log, view->offset);
9748 		view->state.log.selected += view->offset;
9749 		break;
9750 	case TOG_VIEW_REF:
9751 		ref_scroll_up(&view->state.ref, view->offset);
9752 		view->state.ref.selected += view->offset;
9753 		break;
9754 	case TOG_VIEW_TREE:
9755 		tree_scroll_up(&view->state.tree, view->offset);
9756 		view->state.tree.selected += view->offset;
9757 		break;
9758 	default:
9759 		break;
9760 	}
9761 
9762 	view->offset = 0;
9763 }
9764 
9765 /*
9766  * If the selected line is in the section of screen covered by the bottom split,
9767  * scroll down offset lines to move it into view and index its new position.
9768  */
9769 static const struct got_error *
9770 offset_selection_down(struct tog_view *view)
9771 {
9772 	const struct got_error	*err = NULL;
9773 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9774 	int			*selected = NULL;
9775 	int			 header, offset;
9776 
9777 	switch (view->type) {
9778 	case TOG_VIEW_BLAME: {
9779 		struct tog_blame_view_state *s = &view->state.blame;
9780 		header = 3;
9781 		scrolld = NULL;
9782 		if (s->selected_line > view->nlines - header) {
9783 			offset = abs(view->nlines - s->selected_line - header);
9784 			s->first_displayed_line += offset;
9785 			s->selected_line -= offset;
9786 			view->offset = offset;
9787 		}
9788 		break;
9789 	}
9790 	case TOG_VIEW_LOG: {
9791 		struct tog_log_view_state *s = &view->state.log;
9792 		scrolld = &log_scroll_down;
9793 		header = view_is_parent_view(view) ? 3 : 2;
9794 		selected = &s->selected;
9795 		break;
9796 	}
9797 	case TOG_VIEW_REF: {
9798 		struct tog_ref_view_state *s = &view->state.ref;
9799 		scrolld = &ref_scroll_down;
9800 		header = 3;
9801 		selected = &s->selected;
9802 		break;
9803 	}
9804 	case TOG_VIEW_TREE: {
9805 		struct tog_tree_view_state *s = &view->state.tree;
9806 		scrolld = &tree_scroll_down;
9807 		header = 5;
9808 		selected = &s->selected;
9809 		break;
9810 	}
9811 	default:
9812 		selected = NULL;
9813 		scrolld = NULL;
9814 		header = 0;
9815 		break;
9816 	}
9817 
9818 	if (selected && *selected > view->nlines - header) {
9819 		offset = abs(view->nlines - *selected - header);
9820 		view->offset = offset;
9821 		if (scrolld && offset) {
9822 			err = scrolld(view, offset);
9823 			*selected -= offset;
9824 		}
9825 	}
9826 
9827 	return err;
9828 }
9829 
9830 static void
9831 list_commands(FILE *fp)
9832 {
9833 	size_t i;
9834 
9835 	fprintf(fp, "commands:");
9836 	for (i = 0; i < nitems(tog_commands); i++) {
9837 		const struct tog_cmd *cmd = &tog_commands[i];
9838 		fprintf(fp, " %s", cmd->name);
9839 	}
9840 	fputc('\n', fp);
9841 }
9842 
9843 __dead static void
9844 usage(int hflag, int status)
9845 {
9846 	FILE *fp = (status == 0) ? stdout : stderr;
9847 
9848 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9849 	    getprogname());
9850 	if (hflag) {
9851 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9852 		list_commands(fp);
9853 	}
9854 	exit(status);
9855 }
9856 
9857 static char **
9858 make_argv(int argc, ...)
9859 {
9860 	va_list ap;
9861 	char **argv;
9862 	int i;
9863 
9864 	va_start(ap, argc);
9865 
9866 	argv = calloc(argc, sizeof(char *));
9867 	if (argv == NULL)
9868 		err(1, "calloc");
9869 	for (i = 0; i < argc; i++) {
9870 		argv[i] = strdup(va_arg(ap, char *));
9871 		if (argv[i] == NULL)
9872 			err(1, "strdup");
9873 	}
9874 
9875 	va_end(ap);
9876 	return argv;
9877 }
9878 
9879 /*
9880  * Try to convert 'tog path' into a 'tog log path' command.
9881  * The user could simply have mistyped the command rather than knowingly
9882  * provided a path. So check whether argv[0] can in fact be resolved
9883  * to a path in the HEAD commit and print a special error if not.
9884  * This hack is for mpi@ <3
9885  */
9886 static const struct got_error *
9887 tog_log_with_path(int argc, char *argv[])
9888 {
9889 	const struct got_error *error = NULL, *close_err;
9890 	const struct tog_cmd *cmd = NULL;
9891 	struct got_repository *repo = NULL;
9892 	struct got_worktree *worktree = NULL;
9893 	struct got_object_id *commit_id = NULL, *id = NULL;
9894 	struct got_commit_object *commit = NULL;
9895 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9896 	char *commit_id_str = NULL, **cmd_argv = NULL;
9897 	int *pack_fds = NULL;
9898 
9899 	cwd = getcwd(NULL, 0);
9900 	if (cwd == NULL)
9901 		return got_error_from_errno("getcwd");
9902 
9903 	error = got_repo_pack_fds_open(&pack_fds);
9904 	if (error != NULL)
9905 		goto done;
9906 
9907 	error = got_worktree_open(&worktree, cwd, NULL);
9908 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9909 		goto done;
9910 
9911 	if (worktree)
9912 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9913 	else
9914 		repo_path = strdup(cwd);
9915 	if (repo_path == NULL) {
9916 		error = got_error_from_errno("strdup");
9917 		goto done;
9918 	}
9919 
9920 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9921 	if (error != NULL)
9922 		goto done;
9923 
9924 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9925 	    repo, worktree);
9926 	if (error)
9927 		goto done;
9928 
9929 	error = tog_load_refs(repo, 0);
9930 	if (error)
9931 		goto done;
9932 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9933 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9934 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9935 	if (error)
9936 		goto done;
9937 
9938 	if (worktree) {
9939 		got_worktree_close(worktree);
9940 		worktree = NULL;
9941 	}
9942 
9943 	error = got_object_open_as_commit(&commit, repo, commit_id);
9944 	if (error)
9945 		goto done;
9946 
9947 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9948 	if (error) {
9949 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9950 			goto done;
9951 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9952 		    getprogname(), argv[0]);
9953 		usage(1, 1);
9954 		/* not reached */
9955 	}
9956 
9957 	error = got_object_id_str(&commit_id_str, commit_id);
9958 	if (error)
9959 		goto done;
9960 
9961 	cmd = &tog_commands[0]; /* log */
9962 	argc = 4;
9963 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9964 	error = cmd->cmd_main(argc, cmd_argv);
9965 done:
9966 	if (repo) {
9967 		close_err = got_repo_close(repo);
9968 		if (error == NULL)
9969 			error = close_err;
9970 	}
9971 	if (commit)
9972 		got_object_commit_close(commit);
9973 	if (worktree)
9974 		got_worktree_close(worktree);
9975 	if (pack_fds) {
9976 		const struct got_error *pack_err =
9977 		    got_repo_pack_fds_close(pack_fds);
9978 		if (error == NULL)
9979 			error = pack_err;
9980 	}
9981 	free(id);
9982 	free(commit_id_str);
9983 	free(commit_id);
9984 	free(cwd);
9985 	free(repo_path);
9986 	free(in_repo_path);
9987 	if (cmd_argv) {
9988 		int i;
9989 		for (i = 0; i < argc; i++)
9990 			free(cmd_argv[i]);
9991 		free(cmd_argv);
9992 	}
9993 	tog_free_refs();
9994 	return error;
9995 }
9996 
9997 int
9998 main(int argc, char *argv[])
9999 {
10000 	const struct got_error *io_err, *error = NULL;
10001 	const struct tog_cmd *cmd = NULL;
10002 	int ch, hflag = 0, Vflag = 0;
10003 	char **cmd_argv = NULL;
10004 	static const struct option longopts[] = {
10005 	    { "version", no_argument, NULL, 'V' },
10006 	    { NULL, 0, NULL, 0}
10007 	};
10008 	char *diff_algo_str = NULL;
10009 	const char *test_script_path;
10010 
10011 	setlocale(LC_CTYPE, "");
10012 
10013 	/*
10014 	 * Test mode init must happen before pledge() because "tty" will
10015 	 * not allow TTY-related ioctls to occur via regular files.
10016 	 */
10017 	test_script_path = getenv("TOG_TEST_SCRIPT");
10018 	if (test_script_path != NULL) {
10019 		error = init_mock_term(test_script_path);
10020 		if (error) {
10021 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10022 			return 1;
10023 		}
10024 	} else if (!isatty(STDIN_FILENO))
10025 		errx(1, "standard input is not a tty");
10026 
10027 #if !defined(PROFILE)
10028 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
10029 	    NULL) == -1)
10030 		err(1, "pledge");
10031 #endif
10032 
10033 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
10034 		switch (ch) {
10035 		case 'h':
10036 			hflag = 1;
10037 			break;
10038 		case 'V':
10039 			Vflag = 1;
10040 			break;
10041 		default:
10042 			usage(hflag, 1);
10043 			/* NOTREACHED */
10044 		}
10045 	}
10046 
10047 	argc -= optind;
10048 	argv += optind;
10049 	optind = 1;
10050 	optreset = 1;
10051 
10052 	if (Vflag) {
10053 		got_version_print_str();
10054 		return 0;
10055 	}
10056 
10057 	if (argc == 0) {
10058 		if (hflag)
10059 			usage(hflag, 0);
10060 		/* Build an argument vector which runs a default command. */
10061 		cmd = &tog_commands[0];
10062 		argc = 1;
10063 		cmd_argv = make_argv(argc, cmd->name);
10064 	} else {
10065 		size_t i;
10066 
10067 		/* Did the user specify a command? */
10068 		for (i = 0; i < nitems(tog_commands); i++) {
10069 			if (strncmp(tog_commands[i].name, argv[0],
10070 			    strlen(argv[0])) == 0) {
10071 				cmd = &tog_commands[i];
10072 				break;
10073 			}
10074 		}
10075 	}
10076 
10077 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10078 	if (diff_algo_str) {
10079 		if (strcasecmp(diff_algo_str, "patience") == 0)
10080 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10081 		if (strcasecmp(diff_algo_str, "myers") == 0)
10082 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10083 	}
10084 
10085 	if (cmd == NULL) {
10086 		if (argc != 1)
10087 			usage(0, 1);
10088 		/* No command specified; try log with a path */
10089 		error = tog_log_with_path(argc, argv);
10090 	} else {
10091 		if (hflag)
10092 			cmd->cmd_usage();
10093 		else
10094 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10095 	}
10096 
10097 	if (using_mock_io) {
10098 		io_err = tog_io_close();
10099 		if (error == NULL)
10100 			error = io_err;
10101 	}
10102 	endwin();
10103 	if (cmd_argv) {
10104 		int i;
10105 		for (i = 0; i < argc; i++)
10106 			free(cmd_argv[i]);
10107 		free(cmd_argv);
10108 	}
10109 
10110 	if (error && error->code != GOT_ERR_CANCELLED &&
10111 	    error->code != GOT_ERR_EOF &&
10112 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10113 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10114 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10115 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10116 		return 1;
10117 	}
10118 	return 0;
10119 }