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