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