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 "got_compat.h"
18 
19 #include <sys/queue.h>
20 #include <sys/stat.h>
21 #include <sys/ioctl.h>
22 
23 #include <ctype.h>
24 #include <errno.h>
25 #if defined(__FreeBSD__) || defined(__APPLE__)
26 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
27 #endif
28 #include <curses.h>
29 #include <panel.h>
30 #include <locale.h>
31 #include <signal.h>
32 #include <stdlib.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <getopt.h>
36 #include <string.h>
37 #include <err.h>
38 #include <unistd.h>
39 #include <limits.h>
40 #include <wchar.h>
41 #include <time.h>
42 #include <pthread.h>
43 #include <libgen.h>
44 #include <regex.h>
45 #include <sched.h>
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 	TOG_VIEW_HELP
112 };
113 
114 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
115 enum tog_keymap_type {
116 	TOG_KEYMAP_KEYS = -2,
117 	TOG_KEYMAP_GLOBAL,
118 	TOG_KEYMAP_DIFF,
119 	TOG_KEYMAP_LOG,
120 	TOG_KEYMAP_BLAME,
121 	TOG_KEYMAP_TREE,
122 	TOG_KEYMAP_REF,
123 	TOG_KEYMAP_HELP
124 };
125 
126 enum tog_view_mode {
127 	TOG_VIEW_SPLIT_NONE,
128 	TOG_VIEW_SPLIT_VERT,
129 	TOG_VIEW_SPLIT_HRZN
130 };
131 
132 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
133 
134 #define TOG_EOF_STRING	"(END)"
135 
136 struct commit_queue_entry {
137 	TAILQ_ENTRY(commit_queue_entry) entry;
138 	struct got_object_id *id;
139 	struct got_commit_object *commit;
140 	int idx;
141 };
142 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
143 struct commit_queue {
144 	int ncommits;
145 	struct commit_queue_head head;
146 };
147 
148 struct tog_color {
149 	STAILQ_ENTRY(tog_color) entry;
150 	regex_t regex;
151 	short colorpair;
152 };
153 STAILQ_HEAD(tog_colors, tog_color);
154 
155 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
156 static struct got_reflist_object_id_map *tog_refs_idmap;
157 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
158 
159 static const struct got_error *
160 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
161     struct got_reference* re2)
162 {
163 	const char *name1 = got_ref_get_name(re1);
164 	const char *name2 = got_ref_get_name(re2);
165 	int isbackup1, isbackup2;
166 
167 	/* Sort backup refs towards the bottom of the list. */
168 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
169 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
170 	if (!isbackup1 && isbackup2) {
171 		*cmp = -1;
172 		return NULL;
173 	} else if (isbackup1 && !isbackup2) {
174 		*cmp = 1;
175 		return NULL;
176 	}
177 
178 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
179 	return NULL;
180 }
181 
182 static const struct got_error *
183 tog_load_refs(struct got_repository *repo, int sort_by_date)
184 {
185 	const struct got_error *err;
186 
187 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
188 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
189 	    repo);
190 	if (err)
191 		return err;
192 
193 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
194 	    repo);
195 }
196 
197 static void
198 tog_free_refs(void)
199 {
200 	if (tog_refs_idmap) {
201 		got_reflist_object_id_map_free(tog_refs_idmap);
202 		tog_refs_idmap = NULL;
203 	}
204 	got_ref_list_free(&tog_refs);
205 }
206 
207 static const struct got_error *
208 add_color(struct tog_colors *colors, const char *pattern,
209     int idx, short color)
210 {
211 	const struct got_error *err = NULL;
212 	struct tog_color *tc;
213 	int regerr = 0;
214 
215 	if (idx < 1 || idx > COLOR_PAIRS - 1)
216 		return NULL;
217 
218 	init_pair(idx, color, -1);
219 
220 	tc = calloc(1, sizeof(*tc));
221 	if (tc == NULL)
222 		return got_error_from_errno("calloc");
223 	regerr = regcomp(&tc->regex, pattern,
224 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
225 	if (regerr) {
226 		static char regerr_msg[512];
227 		static char err_msg[512];
228 		regerror(regerr, &tc->regex, regerr_msg,
229 		    sizeof(regerr_msg));
230 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
231 		    regerr_msg);
232 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
233 		free(tc);
234 		return err;
235 	}
236 	tc->colorpair = idx;
237 	STAILQ_INSERT_HEAD(colors, tc, entry);
238 	return NULL;
239 }
240 
241 static void
242 free_colors(struct tog_colors *colors)
243 {
244 	struct tog_color *tc;
245 
246 	while (!STAILQ_EMPTY(colors)) {
247 		tc = STAILQ_FIRST(colors);
248 		STAILQ_REMOVE_HEAD(colors, entry);
249 		regfree(&tc->regex);
250 		free(tc);
251 	}
252 }
253 
254 static struct tog_color *
255 get_color(struct tog_colors *colors, int colorpair)
256 {
257 	struct tog_color *tc = NULL;
258 
259 	STAILQ_FOREACH(tc, colors, entry) {
260 		if (tc->colorpair == colorpair)
261 			return tc;
262 	}
263 
264 	return NULL;
265 }
266 
267 static int
268 default_color_value(const char *envvar)
269 {
270 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
271 		return COLOR_MAGENTA;
272 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
273 		return COLOR_CYAN;
274 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
275 		return COLOR_YELLOW;
276 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
277 		return COLOR_GREEN;
278 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
279 		return COLOR_MAGENTA;
280 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
281 		return COLOR_MAGENTA;
282 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
283 		return COLOR_CYAN;
284 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
285 		return COLOR_GREEN;
286 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
287 		return COLOR_GREEN;
288 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
289 		return COLOR_CYAN;
290 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
291 		return COLOR_YELLOW;
292 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
293 		return COLOR_GREEN;
294 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
295 		return COLOR_MAGENTA;
296 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
297 		return COLOR_YELLOW;
298 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
299 		return COLOR_CYAN;
300 
301 	return -1;
302 }
303 
304 static int
305 get_color_value(const char *envvar)
306 {
307 	const char *val = getenv(envvar);
308 
309 	if (val == NULL)
310 		return default_color_value(envvar);
311 
312 	if (strcasecmp(val, "black") == 0)
313 		return COLOR_BLACK;
314 	if (strcasecmp(val, "red") == 0)
315 		return COLOR_RED;
316 	if (strcasecmp(val, "green") == 0)
317 		return COLOR_GREEN;
318 	if (strcasecmp(val, "yellow") == 0)
319 		return COLOR_YELLOW;
320 	if (strcasecmp(val, "blue") == 0)
321 		return COLOR_BLUE;
322 	if (strcasecmp(val, "magenta") == 0)
323 		return COLOR_MAGENTA;
324 	if (strcasecmp(val, "cyan") == 0)
325 		return COLOR_CYAN;
326 	if (strcasecmp(val, "white") == 0)
327 		return COLOR_WHITE;
328 	if (strcasecmp(val, "default") == 0)
329 		return -1;
330 
331 	return default_color_value(envvar);
332 }
333 
334 struct tog_diff_view_state {
335 	struct got_object_id *id1, *id2;
336 	const char *label1, *label2;
337 	FILE *f, *f1, *f2;
338 	int fd1, fd2;
339 	int lineno;
340 	int first_displayed_line;
341 	int last_displayed_line;
342 	int eof;
343 	int diff_context;
344 	int ignore_whitespace;
345 	int force_text_diff;
346 	struct got_repository *repo;
347 	struct got_diff_line *lines;
348 	size_t nlines;
349 	int matched_line;
350 	int selected_line;
351 
352 	/* passed from log or blame view; may be NULL */
353 	struct tog_view *parent_view;
354 };
355 
356 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
357 static volatile sig_atomic_t tog_thread_error;
358 
359 struct tog_log_thread_args {
360 	pthread_cond_t need_commits;
361 	pthread_cond_t commit_loaded;
362 	int commits_needed;
363 	int load_all;
364 	struct got_commit_graph *graph;
365 	struct commit_queue *real_commits;
366 	const char *in_repo_path;
367 	struct got_object_id *start_id;
368 	struct got_repository *repo;
369 	int *pack_fds;
370 	int log_complete;
371 	sig_atomic_t *quit;
372 	struct commit_queue_entry **first_displayed_entry;
373 	struct commit_queue_entry **selected_entry;
374 	int *searching;
375 	int *search_next_done;
376 	regex_t *regex;
377 	int *limiting;
378 	int limit_match;
379 	regex_t *limit_regex;
380 	struct commit_queue *limit_commits;
381 };
382 
383 struct tog_log_view_state {
384 	struct commit_queue *commits;
385 	struct commit_queue_entry *first_displayed_entry;
386 	struct commit_queue_entry *last_displayed_entry;
387 	struct commit_queue_entry *selected_entry;
388 	struct commit_queue real_commits;
389 	int selected;
390 	char *in_repo_path;
391 	char *head_ref_name;
392 	int log_branches;
393 	struct got_repository *repo;
394 	struct got_object_id *start_id;
395 	sig_atomic_t quit;
396 	pthread_t thread;
397 	struct tog_log_thread_args thread_args;
398 	struct commit_queue_entry *matched_entry;
399 	struct commit_queue_entry *search_entry;
400 	struct tog_colors colors;
401 	int use_committer;
402 	int limit_view;
403 	regex_t limit_regex;
404 	struct commit_queue limit_commits;
405 };
406 
407 #define TOG_COLOR_DIFF_MINUS		1
408 #define TOG_COLOR_DIFF_PLUS		2
409 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
410 #define TOG_COLOR_DIFF_META		4
411 #define TOG_COLOR_TREE_SUBMODULE	5
412 #define TOG_COLOR_TREE_SYMLINK		6
413 #define TOG_COLOR_TREE_DIRECTORY	7
414 #define TOG_COLOR_TREE_EXECUTABLE	8
415 #define TOG_COLOR_COMMIT		9
416 #define TOG_COLOR_AUTHOR		10
417 #define TOG_COLOR_DATE			11
418 #define TOG_COLOR_REFS_HEADS		12
419 #define TOG_COLOR_REFS_TAGS		13
420 #define TOG_COLOR_REFS_REMOTES		14
421 #define TOG_COLOR_REFS_BACKUP		15
422 
423 struct tog_blame_cb_args {
424 	struct tog_blame_line *lines; /* one per line */
425 	int nlines;
426 
427 	struct tog_view *view;
428 	struct got_object_id *commit_id;
429 	int *quit;
430 };
431 
432 struct tog_blame_thread_args {
433 	const char *path;
434 	struct got_repository *repo;
435 	struct tog_blame_cb_args *cb_args;
436 	int *complete;
437 	got_cancel_cb cancel_cb;
438 	void *cancel_arg;
439 	pthread_cond_t blame_complete;
440 };
441 
442 struct tog_blame {
443 	FILE *f;
444 	off_t filesize;
445 	struct tog_blame_line *lines;
446 	int nlines;
447 	off_t *line_offsets;
448 	pthread_t thread;
449 	struct tog_blame_thread_args thread_args;
450 	struct tog_blame_cb_args cb_args;
451 	const char *path;
452 	int *pack_fds;
453 };
454 
455 struct tog_blame_view_state {
456 	int first_displayed_line;
457 	int last_displayed_line;
458 	int selected_line;
459 	int last_diffed_line;
460 	int blame_complete;
461 	int eof;
462 	int done;
463 	struct got_object_id_queue blamed_commits;
464 	struct got_object_qid *blamed_commit;
465 	char *path;
466 	struct got_repository *repo;
467 	struct got_object_id *commit_id;
468 	struct got_object_id *id_to_log;
469 	struct tog_blame blame;
470 	int matched_line;
471 	struct tog_colors colors;
472 };
473 
474 struct tog_parent_tree {
475 	TAILQ_ENTRY(tog_parent_tree) entry;
476 	struct got_tree_object *tree;
477 	struct got_tree_entry *first_displayed_entry;
478 	struct got_tree_entry *selected_entry;
479 	int selected;
480 };
481 
482 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
483 
484 struct tog_tree_view_state {
485 	char *tree_label;
486 	struct got_object_id *commit_id;/* commit which this tree belongs to */
487 	struct got_tree_object *root;	/* the commit's root tree entry */
488 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
489 	struct got_tree_entry *first_displayed_entry;
490 	struct got_tree_entry *last_displayed_entry;
491 	struct got_tree_entry *selected_entry;
492 	int ndisplayed, selected, show_ids;
493 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
494 	char *head_ref_name;
495 	struct got_repository *repo;
496 	struct got_tree_entry *matched_entry;
497 	struct tog_colors colors;
498 };
499 
500 struct tog_reflist_entry {
501 	TAILQ_ENTRY(tog_reflist_entry) entry;
502 	struct got_reference *ref;
503 	int idx;
504 };
505 
506 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
507 
508 struct tog_ref_view_state {
509 	struct tog_reflist_head refs;
510 	struct tog_reflist_entry *first_displayed_entry;
511 	struct tog_reflist_entry *last_displayed_entry;
512 	struct tog_reflist_entry *selected_entry;
513 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
514 	struct got_repository *repo;
515 	struct tog_reflist_entry *matched_entry;
516 	struct tog_colors colors;
517 };
518 
519 struct tog_help_view_state {
520 	FILE			*f;
521 	off_t			*line_offsets;
522 	size_t			 nlines;
523 	int			 lineno;
524 	int			 first_displayed_line;
525 	int			 last_displayed_line;
526 	int			 eof;
527 	int			 matched_line;
528 	int			 selected_line;
529 	int			 all;
530 	enum tog_keymap_type	 type;
531 };
532 
533 #define GENERATE_HELP \
534 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
535 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
536 	KEY_("k C-p Up", "Move cursor or page up one line"), \
537 	KEY_("j C-n Down", "Move cursor or page down one line"), \
538 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
539 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
540 	KEY_("C-u u", "Scroll the view up one half page"), \
541 	KEY_("C-d d", "Scroll the view down one half page"), \
542 	KEY_("g", "Go to line N (default: first line)"), \
543 	KEY_("Home =", "Go to the first line"), \
544 	KEY_("G", "Go to line N (default: last line)"), \
545 	KEY_("End *", "Go to the last line"), \
546 	KEY_("l Right", "Scroll the view right"), \
547 	KEY_("h Left", "Scroll the view left"), \
548 	KEY_("$", "Scroll view to the rightmost position"), \
549 	KEY_("0", "Scroll view to the leftmost position"), \
550 	KEY_("-", "Decrease size of the focussed split"), \
551 	KEY_("+", "Increase size of the focussed split"), \
552 	KEY_("Tab", "Switch focus between views"), \
553 	KEY_("F", "Toggle fullscreen mode"), \
554 	KEY_("S", "Switch split-screen layout"), \
555 	KEY_("/", "Open prompt to enter search term"), \
556 	KEY_("n", "Find next line/token matching the current search term"), \
557 	KEY_("N", "Find previous line/token matching the current search term"),\
558 	KEY_("q", "Quit the focussed view; Quit help screen"), \
559 	KEY_("Q", "Quit tog"), \
560 	\
561 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
562 	KEY_("< ,", "Move cursor up one commit"), \
563 	KEY_("> .", "Move cursor down one commit"), \
564 	KEY_("Enter", "Open diff view of the selected commit"), \
565 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
566 	KEY_("R", "Open ref view of all repository references"), \
567 	KEY_("T", "Display tree view of the repository from the selected" \
568 	    " commit"), \
569 	KEY_("@", "Toggle between displaying author and committer name"), \
570 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
571 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
572 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
573 	\
574 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
575 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
576 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
577 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
578 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
579 	    " data"), \
580 	KEY_("(", "Go to the previous file in the diff"), \
581 	KEY_(")", "Go to the next file in the diff"), \
582 	KEY_("{", "Go to the previous hunk in the diff"), \
583 	KEY_("}", "Go to the next hunk in the diff"), \
584 	KEY_("[", "Decrease the number of context lines"), \
585 	KEY_("]", "Increase the number of context lines"), \
586 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
587 	\
588 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
589 	KEY_("Enter", "Display diff view of the selected line's commit"), \
590 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
591 	KEY_("L", "Open log view for the currently selected annotated line"), \
592 	KEY_("C", "Reload view with the previously blamed commit"), \
593 	KEY_("c", "Reload view with the version of the file found in the" \
594 	    " selected line's commit"), \
595 	KEY_("p", "Reload view with the version of the file found in the" \
596 	    " selected line's parent commit"), \
597 	\
598 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
599 	KEY_("Enter", "Enter selected directory or open blame view of the" \
600 	    " selected file"), \
601 	KEY_("L", "Open log view for the selected entry"), \
602 	KEY_("R", "Open ref view of all repository references"), \
603 	KEY_("i", "Show object IDs for all tree entries"), \
604 	KEY_("Backspace", "Return to the parent directory"), \
605 	\
606 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
607 	KEY_("Enter", "Display log view of the selected reference"), \
608 	KEY_("T", "Display tree view of the selected reference"), \
609 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
610 	KEY_("m", "Toggle display of last modified date for each reference"), \
611 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
612 	KEY_("C-l", "Reload view with all repository references")
613 
614 struct tog_key_map {
615 	const char		*keys;
616 	const char		*info;
617 	enum tog_keymap_type	 type;
618 };
619 
620 /* curses io for tog regress */
621 struct tog_io {
622 	FILE	*cin;
623 	FILE	*cout;
624 	FILE	*f;
625 	FILE	*sdump;
626 	int	 wait_for_ui;
627 } tog_io;
628 static int using_mock_io;
629 
630 #define TOG_KEY_SCRDUMP	SHRT_MIN
631 
632 /*
633  * We implement two types of views: parent views and child views.
634  *
635  * The 'Tab' key switches focus between a parent view and its child view.
636  * Child views are shown side-by-side to their parent view, provided
637  * there is enough screen estate.
638  *
639  * When a new view is opened from within a parent view, this new view
640  * becomes a child view of the parent view, replacing any existing child.
641  *
642  * When a new view is opened from within a child view, this new view
643  * becomes a parent view which will obscure the views below until the
644  * user quits the new parent view by typing 'q'.
645  *
646  * This list of views contains parent views only.
647  * Child views are only pointed to by their parent view.
648  */
649 TAILQ_HEAD(tog_view_list_head, tog_view);
650 
651 struct tog_view {
652 	TAILQ_ENTRY(tog_view) entry;
653 	WINDOW *window;
654 	PANEL *panel;
655 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
656 	int resized_y, resized_x; /* begin_y/x based on user resizing */
657 	int maxx, x; /* max column and current start column */
658 	int lines, cols; /* copies of LINES and COLS */
659 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
660 	int gline, hiline; /* navigate to and highlight this nG line */
661 	int ch, count; /* current keymap and count prefix */
662 	int resized; /* set when in a resize event */
663 	int focussed; /* Only set on one parent or child view at a time. */
664 	int dying;
665 	struct tog_view *parent;
666 	struct tog_view *child;
667 
668 	/*
669 	 * This flag is initially set on parent views when a new child view
670 	 * is created. It gets toggled when the 'Tab' key switches focus
671 	 * between parent and child.
672 	 * The flag indicates whether focus should be passed on to our child
673 	 * view if this parent view gets picked for focus after another parent
674 	 * view was closed. This prevents child views from losing focus in such
675 	 * situations.
676 	 */
677 	int focus_child;
678 
679 	enum tog_view_mode mode;
680 	/* type-specific state */
681 	enum tog_view_type type;
682 	union {
683 		struct tog_diff_view_state diff;
684 		struct tog_log_view_state log;
685 		struct tog_blame_view_state blame;
686 		struct tog_tree_view_state tree;
687 		struct tog_ref_view_state ref;
688 		struct tog_help_view_state help;
689 	} state;
690 
691 	const struct got_error *(*show)(struct tog_view *);
692 	const struct got_error *(*input)(struct tog_view **,
693 	    struct tog_view *, int);
694 	const struct got_error *(*reset)(struct tog_view *);
695 	const struct got_error *(*resize)(struct tog_view *, int);
696 	const struct got_error *(*close)(struct tog_view *);
697 
698 	const struct got_error *(*search_start)(struct tog_view *);
699 	const struct got_error *(*search_next)(struct tog_view *);
700 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
701 	    int **, int **, int **, int **);
702 	int search_started;
703 	int searching;
704 #define TOG_SEARCH_FORWARD	1
705 #define TOG_SEARCH_BACKWARD	2
706 	int search_next_done;
707 #define TOG_SEARCH_HAVE_MORE	1
708 #define TOG_SEARCH_NO_MORE	2
709 #define TOG_SEARCH_HAVE_NONE	3
710 	regex_t regex;
711 	regmatch_t regmatch;
712 	const char *action;
713 };
714 
715 static const struct got_error *open_diff_view(struct tog_view *,
716     struct got_object_id *, struct got_object_id *,
717     const char *, const char *, int, int, int, struct tog_view *,
718     struct got_repository *);
719 static const struct got_error *show_diff_view(struct tog_view *);
720 static const struct got_error *input_diff_view(struct tog_view **,
721     struct tog_view *, int);
722 static const struct got_error *reset_diff_view(struct tog_view *);
723 static const struct got_error* close_diff_view(struct tog_view *);
724 static const struct got_error *search_start_diff_view(struct tog_view *);
725 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
726     size_t *, int **, int **, int **, int **);
727 static const struct got_error *search_next_view_match(struct tog_view *);
728 
729 static const struct got_error *open_log_view(struct tog_view *,
730     struct got_object_id *, struct got_repository *,
731     const char *, const char *, int);
732 static const struct got_error * show_log_view(struct tog_view *);
733 static const struct got_error *input_log_view(struct tog_view **,
734     struct tog_view *, int);
735 static const struct got_error *resize_log_view(struct tog_view *, int);
736 static const struct got_error *close_log_view(struct tog_view *);
737 static const struct got_error *search_start_log_view(struct tog_view *);
738 static const struct got_error *search_next_log_view(struct tog_view *);
739 
740 static const struct got_error *open_blame_view(struct tog_view *, char *,
741     struct got_object_id *, struct got_repository *);
742 static const struct got_error *show_blame_view(struct tog_view *);
743 static const struct got_error *input_blame_view(struct tog_view **,
744     struct tog_view *, int);
745 static const struct got_error *reset_blame_view(struct tog_view *);
746 static const struct got_error *close_blame_view(struct tog_view *);
747 static const struct got_error *search_start_blame_view(struct tog_view *);
748 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
749     size_t *, int **, int **, int **, int **);
750 
751 static const struct got_error *open_tree_view(struct tog_view *,
752     struct got_object_id *, const char *, struct got_repository *);
753 static const struct got_error *show_tree_view(struct tog_view *);
754 static const struct got_error *input_tree_view(struct tog_view **,
755     struct tog_view *, int);
756 static const struct got_error *close_tree_view(struct tog_view *);
757 static const struct got_error *search_start_tree_view(struct tog_view *);
758 static const struct got_error *search_next_tree_view(struct tog_view *);
759 
760 static const struct got_error *open_ref_view(struct tog_view *,
761     struct got_repository *);
762 static const struct got_error *show_ref_view(struct tog_view *);
763 static const struct got_error *input_ref_view(struct tog_view **,
764     struct tog_view *, int);
765 static const struct got_error *close_ref_view(struct tog_view *);
766 static const struct got_error *search_start_ref_view(struct tog_view *);
767 static const struct got_error *search_next_ref_view(struct tog_view *);
768 
769 static const struct got_error *open_help_view(struct tog_view *,
770     struct tog_view *);
771 static const struct got_error *show_help_view(struct tog_view *);
772 static const struct got_error *input_help_view(struct tog_view **,
773     struct tog_view *, int);
774 static const struct got_error *reset_help_view(struct tog_view *);
775 static const struct got_error* close_help_view(struct tog_view *);
776 static const struct got_error *search_start_help_view(struct tog_view *);
777 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
778     size_t *, int **, int **, int **, int **);
779 
780 static volatile sig_atomic_t tog_sigwinch_received;
781 static volatile sig_atomic_t tog_sigpipe_received;
782 static volatile sig_atomic_t tog_sigcont_received;
783 static volatile sig_atomic_t tog_sigint_received;
784 static volatile sig_atomic_t tog_sigterm_received;
785 
786 static void
787 tog_sigwinch(int signo)
788 {
789 	tog_sigwinch_received = 1;
790 }
791 
792 static void
793 tog_sigpipe(int signo)
794 {
795 	tog_sigpipe_received = 1;
796 }
797 
798 static void
799 tog_sigcont(int signo)
800 {
801 	tog_sigcont_received = 1;
802 }
803 
804 static void
805 tog_sigint(int signo)
806 {
807 	tog_sigint_received = 1;
808 }
809 
810 static void
811 tog_sigterm(int signo)
812 {
813 	tog_sigterm_received = 1;
814 }
815 
816 static int
817 tog_fatal_signal_received(void)
818 {
819 	return (tog_sigpipe_received ||
820 	    tog_sigint_received || tog_sigterm_received);
821 }
822 
823 static const struct got_error *
824 view_close(struct tog_view *view)
825 {
826 	const struct got_error *err = NULL, *child_err = NULL;
827 
828 	if (view->child) {
829 		child_err = view_close(view->child);
830 		view->child = NULL;
831 	}
832 	if (view->close)
833 		err = view->close(view);
834 	if (view->panel)
835 		del_panel(view->panel);
836 	if (view->window)
837 		delwin(view->window);
838 	free(view);
839 	return err ? err : child_err;
840 }
841 
842 static struct tog_view *
843 view_open(int nlines, int ncols, int begin_y, int begin_x,
844     enum tog_view_type type)
845 {
846 	struct tog_view *view = calloc(1, sizeof(*view));
847 
848 	if (view == NULL)
849 		return NULL;
850 
851 	view->type = type;
852 	view->lines = LINES;
853 	view->cols = COLS;
854 	view->nlines = nlines ? nlines : LINES - begin_y;
855 	view->ncols = ncols ? ncols : COLS - begin_x;
856 	view->begin_y = begin_y;
857 	view->begin_x = begin_x;
858 	view->window = newwin(nlines, ncols, begin_y, begin_x);
859 	if (view->window == NULL) {
860 		view_close(view);
861 		return NULL;
862 	}
863 	view->panel = new_panel(view->window);
864 	if (view->panel == NULL ||
865 	    set_panel_userptr(view->panel, view) != OK) {
866 		view_close(view);
867 		return NULL;
868 	}
869 
870 	keypad(view->window, TRUE);
871 	return view;
872 }
873 
874 static int
875 view_split_begin_x(int begin_x)
876 {
877 	if (begin_x > 0 || COLS < 120)
878 		return 0;
879 	return (COLS - MAX(COLS / 2, 80));
880 }
881 
882 /* XXX Stub till we decide what to do. */
883 static int
884 view_split_begin_y(int lines)
885 {
886 	return lines * HSPLIT_SCALE;
887 }
888 
889 static const struct got_error *view_resize(struct tog_view *);
890 
891 static const struct got_error *
892 view_splitscreen(struct tog_view *view)
893 {
894 	const struct got_error *err = NULL;
895 
896 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
897 		if (view->resized_y && view->resized_y < view->lines)
898 			view->begin_y = view->resized_y;
899 		else
900 			view->begin_y = view_split_begin_y(view->nlines);
901 		view->begin_x = 0;
902 	} else if (!view->resized) {
903 		if (view->resized_x && view->resized_x < view->cols - 1 &&
904 		    view->cols > 119)
905 			view->begin_x = view->resized_x;
906 		else
907 			view->begin_x = view_split_begin_x(0);
908 		view->begin_y = 0;
909 	}
910 	view->nlines = LINES - view->begin_y;
911 	view->ncols = COLS - view->begin_x;
912 	view->lines = LINES;
913 	view->cols = COLS;
914 	err = view_resize(view);
915 	if (err)
916 		return err;
917 
918 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
919 		view->parent->nlines = view->begin_y;
920 
921 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
922 		return got_error_from_errno("mvwin");
923 
924 	return NULL;
925 }
926 
927 static const struct got_error *
928 view_fullscreen(struct tog_view *view)
929 {
930 	const struct got_error *err = NULL;
931 
932 	view->begin_x = 0;
933 	view->begin_y = view->resized ? view->begin_y : 0;
934 	view->nlines = view->resized ? view->nlines : LINES;
935 	view->ncols = COLS;
936 	view->lines = LINES;
937 	view->cols = COLS;
938 	err = view_resize(view);
939 	if (err)
940 		return err;
941 
942 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
943 		return got_error_from_errno("mvwin");
944 
945 	return NULL;
946 }
947 
948 static int
949 view_is_parent_view(struct tog_view *view)
950 {
951 	return view->parent == NULL;
952 }
953 
954 static int
955 view_is_splitscreen(struct tog_view *view)
956 {
957 	return view->begin_x > 0 || view->begin_y > 0;
958 }
959 
960 static int
961 view_is_fullscreen(struct tog_view *view)
962 {
963 	return view->nlines == LINES && view->ncols == COLS;
964 }
965 
966 static int
967 view_is_hsplit_top(struct tog_view *view)
968 {
969 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
970 	    view_is_splitscreen(view->child);
971 }
972 
973 static void
974 view_border(struct tog_view *view)
975 {
976 	PANEL *panel;
977 	const struct tog_view *view_above;
978 
979 	if (view->parent)
980 		return view_border(view->parent);
981 
982 	panel = panel_above(view->panel);
983 	if (panel == NULL)
984 		return;
985 
986 	view_above = panel_userptr(panel);
987 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
988 		mvwhline(view->window, view_above->begin_y - 1,
989 		    view->begin_x, ACS_HLINE, view->ncols);
990 	else
991 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
992 		    ACS_VLINE, view->nlines);
993 }
994 
995 static const struct got_error *view_init_hsplit(struct tog_view *, int);
996 static const struct got_error *request_log_commits(struct tog_view *);
997 static const struct got_error *offset_selection_down(struct tog_view *);
998 static void offset_selection_up(struct tog_view *);
999 static void view_get_split(struct tog_view *, int *, int *);
1000 
1001 static const struct got_error *
1002 view_resize(struct tog_view *view)
1003 {
1004 	const struct got_error	*err = NULL;
1005 	int			 dif, nlines, ncols;
1006 
1007 	dif = LINES - view->lines;  /* line difference */
1008 
1009 	if (view->lines > LINES)
1010 		nlines = view->nlines - (view->lines - LINES);
1011 	else
1012 		nlines = view->nlines + (LINES - view->lines);
1013 	if (view->cols > COLS)
1014 		ncols = view->ncols - (view->cols - COLS);
1015 	else
1016 		ncols = view->ncols + (COLS - view->cols);
1017 
1018 	if (view->child) {
1019 		int hs = view->child->begin_y;
1020 
1021 		if (!view_is_fullscreen(view))
1022 			view->child->begin_x = view_split_begin_x(view->begin_x);
1023 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1024 		    view->child->begin_x == 0) {
1025 			ncols = COLS;
1026 
1027 			view_fullscreen(view->child);
1028 			if (view->child->focussed)
1029 				show_panel(view->child->panel);
1030 			else
1031 				show_panel(view->panel);
1032 		} else {
1033 			ncols = view->child->begin_x;
1034 
1035 			view_splitscreen(view->child);
1036 			show_panel(view->child->panel);
1037 		}
1038 		/*
1039 		 * XXX This is ugly and needs to be moved into the above
1040 		 * logic but "works" for now and my attempts at moving it
1041 		 * break either 'tab' or 'F' key maps in horizontal splits.
1042 		 */
1043 		if (hs) {
1044 			err = view_splitscreen(view->child);
1045 			if (err)
1046 				return err;
1047 			if (dif < 0) { /* top split decreased */
1048 				err = offset_selection_down(view);
1049 				if (err)
1050 					return err;
1051 			}
1052 			view_border(view);
1053 			update_panels();
1054 			doupdate();
1055 			show_panel(view->child->panel);
1056 			nlines = view->nlines;
1057 		}
1058 	} else if (view->parent == NULL)
1059 		ncols = COLS;
1060 
1061 	if (view->resize && dif > 0) {
1062 		err = view->resize(view, dif);
1063 		if (err)
1064 			return err;
1065 	}
1066 
1067 	if (wresize(view->window, nlines, ncols) == ERR)
1068 		return got_error_from_errno("wresize");
1069 	if (replace_panel(view->panel, view->window) == ERR)
1070 		return got_error_from_errno("replace_panel");
1071 	wclear(view->window);
1072 
1073 	view->nlines = nlines;
1074 	view->ncols = ncols;
1075 	view->lines = LINES;
1076 	view->cols = COLS;
1077 
1078 	return NULL;
1079 }
1080 
1081 static const struct got_error *
1082 resize_log_view(struct tog_view *view, int increase)
1083 {
1084 	struct tog_log_view_state	*s = &view->state.log;
1085 	const struct got_error		*err = NULL;
1086 	int				 n = 0;
1087 
1088 	if (s->selected_entry)
1089 		n = s->selected_entry->idx + view->lines - s->selected;
1090 
1091 	/*
1092 	 * Request commits to account for the increased
1093 	 * height so we have enough to populate the view.
1094 	 */
1095 	if (s->commits->ncommits < n) {
1096 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1097 		err = request_log_commits(view);
1098 	}
1099 
1100 	return err;
1101 }
1102 
1103 static void
1104 view_adjust_offset(struct tog_view *view, int n)
1105 {
1106 	if (n == 0)
1107 		return;
1108 
1109 	if (view->parent && view->parent->offset) {
1110 		if (view->parent->offset + n >= 0)
1111 			view->parent->offset += n;
1112 		else
1113 			view->parent->offset = 0;
1114 	} else if (view->offset) {
1115 		if (view->offset - n >= 0)
1116 			view->offset -= n;
1117 		else
1118 			view->offset = 0;
1119 	}
1120 }
1121 
1122 static const struct got_error *
1123 view_resize_split(struct tog_view *view, int resize)
1124 {
1125 	const struct got_error	*err = NULL;
1126 	struct tog_view		*v = NULL;
1127 
1128 	if (view->parent)
1129 		v = view->parent;
1130 	else
1131 		v = view;
1132 
1133 	if (!v->child || !view_is_splitscreen(v->child))
1134 		return NULL;
1135 
1136 	v->resized = v->child->resized = resize;  /* lock for resize event */
1137 
1138 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1139 		if (v->child->resized_y)
1140 			v->child->begin_y = v->child->resized_y;
1141 		if (view->parent)
1142 			v->child->begin_y -= resize;
1143 		else
1144 			v->child->begin_y += resize;
1145 		if (v->child->begin_y < 3) {
1146 			view->count = 0;
1147 			v->child->begin_y = 3;
1148 		} else if (v->child->begin_y > LINES - 1) {
1149 			view->count = 0;
1150 			v->child->begin_y = LINES - 1;
1151 		}
1152 		v->ncols = COLS;
1153 		v->child->ncols = COLS;
1154 		view_adjust_offset(view, resize);
1155 		err = view_init_hsplit(v, v->child->begin_y);
1156 		if (err)
1157 			return err;
1158 		v->child->resized_y = v->child->begin_y;
1159 	} else {
1160 		if (v->child->resized_x)
1161 			v->child->begin_x = v->child->resized_x;
1162 		if (view->parent)
1163 			v->child->begin_x -= resize;
1164 		else
1165 			v->child->begin_x += resize;
1166 		if (v->child->begin_x < 11) {
1167 			view->count = 0;
1168 			v->child->begin_x = 11;
1169 		} else if (v->child->begin_x > COLS - 1) {
1170 			view->count = 0;
1171 			v->child->begin_x = COLS - 1;
1172 		}
1173 		v->child->resized_x = v->child->begin_x;
1174 	}
1175 
1176 	v->child->mode = v->mode;
1177 	v->child->nlines = v->lines - v->child->begin_y;
1178 	v->child->ncols = v->cols - v->child->begin_x;
1179 	v->focus_child = 1;
1180 
1181 	err = view_fullscreen(v);
1182 	if (err)
1183 		return err;
1184 	err = view_splitscreen(v->child);
1185 	if (err)
1186 		return err;
1187 
1188 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1189 		err = offset_selection_down(v->child);
1190 		if (err)
1191 			return err;
1192 	}
1193 
1194 	if (v->resize)
1195 		err = v->resize(v, 0);
1196 	else if (v->child->resize)
1197 		err = v->child->resize(v->child, 0);
1198 
1199 	v->resized = v->child->resized = 0;
1200 
1201 	return err;
1202 }
1203 
1204 static void
1205 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1206 {
1207 	struct tog_view *v = src->child ? src->child : src;
1208 
1209 	dst->resized_x = v->resized_x;
1210 	dst->resized_y = v->resized_y;
1211 }
1212 
1213 static const struct got_error *
1214 view_close_child(struct tog_view *view)
1215 {
1216 	const struct got_error *err = NULL;
1217 
1218 	if (view->child == NULL)
1219 		return NULL;
1220 
1221 	err = view_close(view->child);
1222 	view->child = NULL;
1223 	return err;
1224 }
1225 
1226 static const struct got_error *
1227 view_set_child(struct tog_view *view, struct tog_view *child)
1228 {
1229 	const struct got_error *err = NULL;
1230 
1231 	view->child = child;
1232 	child->parent = view;
1233 
1234 	err = view_resize(view);
1235 	if (err)
1236 		return err;
1237 
1238 	if (view->child->resized_x || view->child->resized_y)
1239 		err = view_resize_split(view, 0);
1240 
1241 	return err;
1242 }
1243 
1244 static const struct got_error *view_dispatch_request(struct tog_view **,
1245     struct tog_view *, enum tog_view_type, int, int);
1246 
1247 static const struct got_error *
1248 view_request_new(struct tog_view **requested, struct tog_view *view,
1249     enum tog_view_type request)
1250 {
1251 	struct tog_view		*new_view = NULL;
1252 	const struct got_error	*err;
1253 	int			 y = 0, x = 0;
1254 
1255 	*requested = NULL;
1256 
1257 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1258 		view_get_split(view, &y, &x);
1259 
1260 	err = view_dispatch_request(&new_view, view, request, y, x);
1261 	if (err)
1262 		return err;
1263 
1264 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1265 	    request != TOG_VIEW_HELP) {
1266 		err = view_init_hsplit(view, y);
1267 		if (err)
1268 			return err;
1269 	}
1270 
1271 	view->focussed = 0;
1272 	new_view->focussed = 1;
1273 	new_view->mode = view->mode;
1274 	new_view->nlines = request == TOG_VIEW_HELP ?
1275 	    view->lines : view->lines - y;
1276 
1277 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1278 		view_transfer_size(new_view, view);
1279 		err = view_close_child(view);
1280 		if (err)
1281 			return err;
1282 		err = view_set_child(view, new_view);
1283 		if (err)
1284 			return err;
1285 		view->focus_child = 1;
1286 	} else
1287 		*requested = new_view;
1288 
1289 	return NULL;
1290 }
1291 
1292 static void
1293 tog_resizeterm(void)
1294 {
1295 	int cols, lines;
1296 	struct winsize size;
1297 
1298 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1299 		cols = 80;     /* Default */
1300 		lines = 24;
1301 	} else {
1302 		cols = size.ws_col;
1303 		lines = size.ws_row;
1304 	}
1305 	resize_term(lines, cols);
1306 }
1307 
1308 static const struct got_error *
1309 view_search_start(struct tog_view *view, int fast_refresh)
1310 {
1311 	const struct got_error *err = NULL;
1312 	struct tog_view *v = view;
1313 	char pattern[1024];
1314 	int ret;
1315 
1316 	if (view->search_started) {
1317 		regfree(&view->regex);
1318 		view->searching = 0;
1319 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1320 	}
1321 	view->search_started = 0;
1322 
1323 	if (view->nlines < 1)
1324 		return NULL;
1325 
1326 	if (view_is_hsplit_top(view))
1327 		v = view->child;
1328 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1329 		v = view->parent;
1330 
1331 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1332 	wclrtoeol(v->window);
1333 
1334 	nodelay(v->window, FALSE);  /* block for search term input */
1335 	nocbreak();
1336 	echo();
1337 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1338 	wrefresh(v->window);
1339 	cbreak();
1340 	noecho();
1341 	nodelay(v->window, TRUE);
1342 	if (!fast_refresh && !using_mock_io)
1343 		halfdelay(10);
1344 	if (ret == ERR)
1345 		return NULL;
1346 
1347 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1348 		err = view->search_start(view);
1349 		if (err) {
1350 			regfree(&view->regex);
1351 			return err;
1352 		}
1353 		view->search_started = 1;
1354 		view->searching = TOG_SEARCH_FORWARD;
1355 		view->search_next_done = 0;
1356 		view->search_next(view);
1357 	}
1358 
1359 	return NULL;
1360 }
1361 
1362 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1363 static const struct got_error *
1364 switch_split(struct tog_view *view)
1365 {
1366 	const struct got_error	*err = NULL;
1367 	struct tog_view		*v = NULL;
1368 
1369 	if (view->parent)
1370 		v = view->parent;
1371 	else
1372 		v = view;
1373 
1374 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1375 		v->mode = TOG_VIEW_SPLIT_VERT;
1376 	else
1377 		v->mode = TOG_VIEW_SPLIT_HRZN;
1378 
1379 	if (!v->child)
1380 		return NULL;
1381 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1382 		v->mode = TOG_VIEW_SPLIT_NONE;
1383 
1384 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1385 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1386 		v->child->begin_y = v->child->resized_y;
1387 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1388 		v->child->begin_x = v->child->resized_x;
1389 
1390 
1391 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1392 		v->ncols = COLS;
1393 		v->child->ncols = COLS;
1394 		v->child->nscrolled = LINES - v->child->nlines;
1395 
1396 		err = view_init_hsplit(v, v->child->begin_y);
1397 		if (err)
1398 			return err;
1399 	}
1400 	v->child->mode = v->mode;
1401 	v->child->nlines = v->lines - v->child->begin_y;
1402 	v->focus_child = 1;
1403 
1404 	err = view_fullscreen(v);
1405 	if (err)
1406 		return err;
1407 	err = view_splitscreen(v->child);
1408 	if (err)
1409 		return err;
1410 
1411 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1412 		v->mode = TOG_VIEW_SPLIT_VERT;
1413 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1414 		err = offset_selection_down(v);
1415 		if (err)
1416 			return err;
1417 		err = offset_selection_down(v->child);
1418 		if (err)
1419 			return err;
1420 	} else {
1421 		offset_selection_up(v);
1422 		offset_selection_up(v->child);
1423 	}
1424 	if (v->resize)
1425 		err = v->resize(v, 0);
1426 	else if (v->child->resize)
1427 		err = v->child->resize(v->child, 0);
1428 
1429 	return err;
1430 }
1431 
1432 /*
1433  * Strip trailing whitespace from str starting at byte *n;
1434  * if *n < 0, use strlen(str). Return new str length in *n.
1435  */
1436 static void
1437 strip_trailing_ws(char *str, int *n)
1438 {
1439 	size_t x = *n;
1440 
1441 	if (str == NULL || *str == '\0')
1442 		return;
1443 
1444 	if (x < 0)
1445 		x = strlen(str);
1446 
1447 	while (x-- > 0 && isspace((unsigned char)str[x]))
1448 		str[x] = '\0';
1449 
1450 	*n = x + 1;
1451 }
1452 
1453 /*
1454  * Extract visible substring of line y from the curses screen
1455  * and strip trailing whitespace. If vline is set, overwrite
1456  * line[vline] with '|' because the ACS_VLINE character is
1457  * written out as 'x'. Write the line to file f.
1458  */
1459 static const struct got_error *
1460 view_write_line(FILE *f, int y, int vline)
1461 {
1462 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1463 	int	r, w;
1464 
1465 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1466 	if (r == ERR)
1467 		return got_error_fmt(GOT_ERR_RANGE,
1468 		    "failed to extract line %d", y);
1469 
1470 	/*
1471 	 * In some views, lines are padded with blanks to COLS width.
1472 	 * Strip them so we can diff without the -b flag when testing.
1473 	 */
1474 	strip_trailing_ws(line, &r);
1475 
1476 	if (vline > 0)
1477 		line[vline] = '|';
1478 
1479 	w = fprintf(f, "%s\n", line);
1480 	if (w != r + 1)		/* \n */
1481 		return got_ferror(f, GOT_ERR_IO);
1482 
1483 	return NULL;
1484 }
1485 
1486 /*
1487  * Capture the visible curses screen by writing each line to the
1488  * file at the path set via the TOG_SCR_DUMP environment variable.
1489  */
1490 static const struct got_error *
1491 screendump(struct tog_view *view)
1492 {
1493 	const struct got_error	*err;
1494 	int			 i;
1495 
1496 	err = got_opentemp_truncate(tog_io.sdump);
1497 	if (err)
1498 		return err;
1499 
1500 	if ((view->child && view->child->begin_x) ||
1501 	    (view->parent && view->begin_x)) {
1502 		int ncols = view->child ? view->ncols : view->parent->ncols;
1503 
1504 		/* vertical splitscreen */
1505 		for (i = 0; i < view->nlines; ++i) {
1506 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1507 			if (err)
1508 				goto done;
1509 		}
1510 	} else {
1511 		int hline = 0;
1512 
1513 		/* fullscreen or horizontal splitscreen */
1514 		if ((view->child && view->child->begin_y) ||
1515 		    (view->parent && view->begin_y))	/* hsplit */
1516 			hline = view->child ?
1517 			    view->child->begin_y : view->begin_y;
1518 
1519 		for (i = 0; i < view->lines; i++) {
1520 			if (hline && i == hline - 1) {
1521 				int c;
1522 
1523 				/* ACS_HLINE writes out as 'q', overwrite it */
1524 				for (c = 0; c < view->cols; ++c)
1525 					fputc('-', tog_io.sdump);
1526 				fputc('\n', tog_io.sdump);
1527 				continue;
1528 			}
1529 
1530 			err = view_write_line(tog_io.sdump, i, 0);
1531 			if (err)
1532 				goto done;
1533 		}
1534 	}
1535 
1536 done:
1537 	return err;
1538 }
1539 
1540 /*
1541  * Compute view->count from numeric input. Assign total to view->count and
1542  * return first non-numeric key entered.
1543  */
1544 static int
1545 get_compound_key(struct tog_view *view, int c)
1546 {
1547 	struct tog_view	*v = view;
1548 	int		 x, n = 0;
1549 
1550 	if (view_is_hsplit_top(view))
1551 		v = view->child;
1552 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1553 		v = view->parent;
1554 
1555 	view->count = 0;
1556 	cbreak();  /* block for input */
1557 	nodelay(view->window, FALSE);
1558 	wmove(v->window, v->nlines - 1, 0);
1559 	wclrtoeol(v->window);
1560 	waddch(v->window, ':');
1561 
1562 	do {
1563 		x = getcurx(v->window);
1564 		if (x != ERR && x < view->ncols) {
1565 			waddch(v->window, c);
1566 			wrefresh(v->window);
1567 		}
1568 
1569 		/*
1570 		 * Don't overflow. Max valid request should be the greatest
1571 		 * between the longest and total lines; cap at 10 million.
1572 		 */
1573 		if (n >= 9999999)
1574 			n = 9999999;
1575 		else
1576 			n = n * 10 + (c - '0');
1577 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1578 
1579 	if (c == 'G' || c == 'g') {	/* nG key map */
1580 		view->gline = view->hiline = n;
1581 		n = 0;
1582 		c = 0;
1583 	}
1584 
1585 	/* Massage excessive or inapplicable values at the input handler. */
1586 	view->count = n;
1587 
1588 	return c;
1589 }
1590 
1591 static void
1592 action_report(struct tog_view *view)
1593 {
1594 	struct tog_view *v = view;
1595 
1596 	if (view_is_hsplit_top(view))
1597 		v = view->child;
1598 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1599 		v = view->parent;
1600 
1601 	wmove(v->window, v->nlines - 1, 0);
1602 	wclrtoeol(v->window);
1603 	wprintw(v->window, ":%s", view->action);
1604 	wrefresh(v->window);
1605 
1606 	/*
1607 	 * Clear action status report. Only clear in blame view
1608 	 * once annotating is complete, otherwise it's too fast.
1609 	 */
1610 	if (view->type == TOG_VIEW_BLAME) {
1611 		if (view->state.blame.blame_complete)
1612 			view->action = NULL;
1613 	} else
1614 		view->action = NULL;
1615 }
1616 
1617 /*
1618  * Read the next line from the test script and assign
1619  * key instruction to *ch. If at EOF, set the *done flag.
1620  */
1621 static const struct got_error *
1622 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1623 {
1624 	const struct got_error	*err = NULL;
1625 	char			*line = NULL;
1626 	size_t			 linesz = 0;
1627 
1628 	if (view->count && --view->count) {
1629 		*ch = view->ch;
1630 		return NULL;
1631 	} else
1632 		*ch = -1;
1633 
1634 	if (getline(&line, &linesz, script) == -1) {
1635 		if (feof(script)) {
1636 			*done = 1;
1637 			goto done;
1638 		} else {
1639 			err = got_ferror(script, GOT_ERR_IO);
1640 			goto done;
1641 		}
1642 	}
1643 
1644 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1645 		tog_io.wait_for_ui = 1;
1646 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1647 		*ch = KEY_ENTER;
1648 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1649 		*ch = KEY_RIGHT;
1650 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1651 		*ch = KEY_LEFT;
1652 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1653 		*ch = KEY_DOWN;
1654 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1655 		*ch = KEY_UP;
1656 	else if (strncasecmp(line, "TAB", 3) == 0)
1657 		*ch = '\t';
1658 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1659 		*ch = TOG_KEY_SCRDUMP;
1660 	else if (isdigit((unsigned char)*line)) {
1661 		char *t = line;
1662 
1663 		while (isdigit((unsigned char)*t))
1664 			++t;
1665 		view->ch = *ch = *t;
1666 		*t = '\0';
1667 		/* ignore error, view->count is 0 if instruction is invalid */
1668 		view->count = strtonum(line, 0, INT_MAX, NULL);
1669 	} else
1670 		*ch = *line;
1671 
1672 done:
1673 	free(line);
1674 	return err;
1675 }
1676 
1677 static const struct got_error *
1678 view_input(struct tog_view **new, int *done, struct tog_view *view,
1679     struct tog_view_list_head *views, int fast_refresh)
1680 {
1681 	const struct got_error *err = NULL;
1682 	struct tog_view *v;
1683 	int ch, errcode;
1684 
1685 	*new = NULL;
1686 
1687 	if (view->action)
1688 		action_report(view);
1689 
1690 	/* Clear "no matches" indicator. */
1691 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1692 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1693 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1694 		view->count = 0;
1695 	}
1696 
1697 	if (view->searching && !view->search_next_done) {
1698 		errcode = pthread_mutex_unlock(&tog_mutex);
1699 		if (errcode)
1700 			return got_error_set_errno(errcode,
1701 			    "pthread_mutex_unlock");
1702 		sched_yield();
1703 		errcode = pthread_mutex_lock(&tog_mutex);
1704 		if (errcode)
1705 			return got_error_set_errno(errcode,
1706 			    "pthread_mutex_lock");
1707 		view->search_next(view);
1708 		return NULL;
1709 	}
1710 
1711 	/* Allow threads to make progress while we are waiting for input. */
1712 	errcode = pthread_mutex_unlock(&tog_mutex);
1713 	if (errcode)
1714 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1715 
1716 	if (using_mock_io) {
1717 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1718 		if (err) {
1719 			errcode = pthread_mutex_lock(&tog_mutex);
1720 			return err;
1721 		}
1722 	} else if (view->count && --view->count) {
1723 		cbreak();
1724 		nodelay(view->window, TRUE);
1725 		ch = wgetch(view->window);
1726 		/* let C-g or backspace abort unfinished count */
1727 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1728 			view->count = 0;
1729 		else
1730 			ch = view->ch;
1731 	} else {
1732 		ch = wgetch(view->window);
1733 		if (ch >= '1' && ch  <= '9')
1734 			view->ch = ch = get_compound_key(view, ch);
1735 	}
1736 	if (view->hiline && ch != ERR && ch != 0)
1737 		view->hiline = 0;  /* key pressed, clear line highlight */
1738 	nodelay(view->window, TRUE);
1739 	errcode = pthread_mutex_lock(&tog_mutex);
1740 	if (errcode)
1741 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1742 
1743 	if (tog_sigwinch_received || tog_sigcont_received) {
1744 		tog_resizeterm();
1745 		tog_sigwinch_received = 0;
1746 		tog_sigcont_received = 0;
1747 		TAILQ_FOREACH(v, views, entry) {
1748 			err = view_resize(v);
1749 			if (err)
1750 				return err;
1751 			err = v->input(new, v, KEY_RESIZE);
1752 			if (err)
1753 				return err;
1754 			if (v->child) {
1755 				err = view_resize(v->child);
1756 				if (err)
1757 					return err;
1758 				err = v->child->input(new, v->child,
1759 				    KEY_RESIZE);
1760 				if (err)
1761 					return err;
1762 				if (v->child->resized_x || v->child->resized_y) {
1763 					err = view_resize_split(v, 0);
1764 					if (err)
1765 						return err;
1766 				}
1767 			}
1768 		}
1769 	}
1770 
1771 	switch (ch) {
1772 	case '?':
1773 	case 'H':
1774 	case KEY_F(1):
1775 		if (view->type == TOG_VIEW_HELP)
1776 			err = view->reset(view);
1777 		else
1778 			err = view_request_new(new, view, TOG_VIEW_HELP);
1779 		break;
1780 	case '\t':
1781 		view->count = 0;
1782 		if (view->child) {
1783 			view->focussed = 0;
1784 			view->child->focussed = 1;
1785 			view->focus_child = 1;
1786 		} else if (view->parent) {
1787 			view->focussed = 0;
1788 			view->parent->focussed = 1;
1789 			view->parent->focus_child = 0;
1790 			if (!view_is_splitscreen(view)) {
1791 				if (view->parent->resize) {
1792 					err = view->parent->resize(view->parent,
1793 					    0);
1794 					if (err)
1795 						return err;
1796 				}
1797 				offset_selection_up(view->parent);
1798 				err = view_fullscreen(view->parent);
1799 				if (err)
1800 					return err;
1801 			}
1802 		}
1803 		break;
1804 	case 'q':
1805 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1806 			if (view->parent->resize) {
1807 				/* might need more commits to fill fullscreen */
1808 				err = view->parent->resize(view->parent, 0);
1809 				if (err)
1810 					break;
1811 			}
1812 			offset_selection_up(view->parent);
1813 		}
1814 		err = view->input(new, view, ch);
1815 		view->dying = 1;
1816 		break;
1817 	case 'Q':
1818 		*done = 1;
1819 		break;
1820 	case 'F':
1821 		view->count = 0;
1822 		if (view_is_parent_view(view)) {
1823 			if (view->child == NULL)
1824 				break;
1825 			if (view_is_splitscreen(view->child)) {
1826 				view->focussed = 0;
1827 				view->child->focussed = 1;
1828 				err = view_fullscreen(view->child);
1829 			} else {
1830 				err = view_splitscreen(view->child);
1831 				if (!err)
1832 					err = view_resize_split(view, 0);
1833 			}
1834 			if (err)
1835 				break;
1836 			err = view->child->input(new, view->child,
1837 			    KEY_RESIZE);
1838 		} else {
1839 			if (view_is_splitscreen(view)) {
1840 				view->parent->focussed = 0;
1841 				view->focussed = 1;
1842 				err = view_fullscreen(view);
1843 			} else {
1844 				err = view_splitscreen(view);
1845 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1846 					err = view_resize(view->parent);
1847 				if (!err)
1848 					err = view_resize_split(view, 0);
1849 			}
1850 			if (err)
1851 				break;
1852 			err = view->input(new, view, KEY_RESIZE);
1853 		}
1854 		if (err)
1855 			break;
1856 		if (view->resize) {
1857 			err = view->resize(view, 0);
1858 			if (err)
1859 				break;
1860 		}
1861 		if (view->parent) {
1862 			if (view->parent->resize) {
1863 				err = view->parent->resize(view->parent, 0);
1864 				if (err != NULL)
1865 					break;
1866 			}
1867 			err = offset_selection_down(view->parent);
1868 			if (err != NULL)
1869 				break;
1870 		}
1871 		err = offset_selection_down(view);
1872 		break;
1873 	case 'S':
1874 		view->count = 0;
1875 		err = switch_split(view);
1876 		break;
1877 	case '-':
1878 		err = view_resize_split(view, -1);
1879 		break;
1880 	case '+':
1881 		err = view_resize_split(view, 1);
1882 		break;
1883 	case KEY_RESIZE:
1884 		break;
1885 	case '/':
1886 		view->count = 0;
1887 		if (view->search_start)
1888 			view_search_start(view, fast_refresh);
1889 		else
1890 			err = view->input(new, view, ch);
1891 		break;
1892 	case 'N':
1893 	case 'n':
1894 		if (view->search_started && view->search_next) {
1895 			view->searching = (ch == 'n' ?
1896 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1897 			view->search_next_done = 0;
1898 			view->search_next(view);
1899 		} else
1900 			err = view->input(new, view, ch);
1901 		break;
1902 	case 'A':
1903 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1904 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1905 			view->action = "Patience diff algorithm";
1906 		} else {
1907 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1908 			view->action = "Myers diff algorithm";
1909 		}
1910 		TAILQ_FOREACH(v, views, entry) {
1911 			if (v->reset) {
1912 				err = v->reset(v);
1913 				if (err)
1914 					return err;
1915 			}
1916 			if (v->child && v->child->reset) {
1917 				err = v->child->reset(v->child);
1918 				if (err)
1919 					return err;
1920 			}
1921 		}
1922 		break;
1923 	case TOG_KEY_SCRDUMP:
1924 		err = screendump(view);
1925 		break;
1926 	default:
1927 		err = view->input(new, view, ch);
1928 		break;
1929 	}
1930 
1931 	return err;
1932 }
1933 
1934 static int
1935 view_needs_focus_indication(struct tog_view *view)
1936 {
1937 	if (view_is_parent_view(view)) {
1938 		if (view->child == NULL || view->child->focussed)
1939 			return 0;
1940 		if (!view_is_splitscreen(view->child))
1941 			return 0;
1942 	} else if (!view_is_splitscreen(view))
1943 		return 0;
1944 
1945 	return view->focussed;
1946 }
1947 
1948 static const struct got_error *
1949 tog_io_close(void)
1950 {
1951 	const struct got_error *err = NULL;
1952 
1953 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1954 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1955 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1956 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1957 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1958 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1959 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1960 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1961 
1962 	return err;
1963 }
1964 
1965 static const struct got_error *
1966 view_loop(struct tog_view *view)
1967 {
1968 	const struct got_error *err = NULL;
1969 	struct tog_view_list_head views;
1970 	struct tog_view *new_view;
1971 	char *mode;
1972 	int fast_refresh = 10;
1973 	int done = 0, errcode;
1974 
1975 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1976 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1977 		view->mode = TOG_VIEW_SPLIT_VERT;
1978 	else
1979 		view->mode = TOG_VIEW_SPLIT_HRZN;
1980 
1981 	errcode = pthread_mutex_lock(&tog_mutex);
1982 	if (errcode)
1983 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1984 
1985 	TAILQ_INIT(&views);
1986 	TAILQ_INSERT_HEAD(&views, view, entry);
1987 
1988 	view->focussed = 1;
1989 	err = view->show(view);
1990 	if (err)
1991 		return err;
1992 	update_panels();
1993 	doupdate();
1994 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1995 	    !tog_fatal_signal_received()) {
1996 		/* Refresh fast during initialization, then become slower. */
1997 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1998 			halfdelay(10); /* switch to once per second */
1999 
2000 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2001 		if (err)
2002 			break;
2003 
2004 		if (view->dying && view == TAILQ_FIRST(&views) &&
2005 		    TAILQ_NEXT(view, entry) == NULL)
2006 			done = 1;
2007 		if (done) {
2008 			struct tog_view *v;
2009 
2010 			/*
2011 			 * When we quit, scroll the screen up a single line
2012 			 * so we don't lose any information.
2013 			 */
2014 			TAILQ_FOREACH(v, &views, entry) {
2015 				wmove(v->window, 0, 0);
2016 				wdeleteln(v->window);
2017 				wnoutrefresh(v->window);
2018 				if (v->child && !view_is_fullscreen(v)) {
2019 					wmove(v->child->window, 0, 0);
2020 					wdeleteln(v->child->window);
2021 					wnoutrefresh(v->child->window);
2022 				}
2023 			}
2024 			doupdate();
2025 		}
2026 
2027 		if (view->dying) {
2028 			struct tog_view *v, *prev = NULL;
2029 
2030 			if (view_is_parent_view(view))
2031 				prev = TAILQ_PREV(view, tog_view_list_head,
2032 				    entry);
2033 			else if (view->parent)
2034 				prev = view->parent;
2035 
2036 			if (view->parent) {
2037 				view->parent->child = NULL;
2038 				view->parent->focus_child = 0;
2039 				/* Restore fullscreen line height. */
2040 				view->parent->nlines = view->parent->lines;
2041 				err = view_resize(view->parent);
2042 				if (err)
2043 					break;
2044 				/* Make resized splits persist. */
2045 				view_transfer_size(view->parent, view);
2046 			} else
2047 				TAILQ_REMOVE(&views, view, entry);
2048 
2049 			err = view_close(view);
2050 			if (err)
2051 				goto done;
2052 
2053 			view = NULL;
2054 			TAILQ_FOREACH(v, &views, entry) {
2055 				if (v->focussed)
2056 					break;
2057 			}
2058 			if (view == NULL && new_view == NULL) {
2059 				/* No view has focus. Try to pick one. */
2060 				if (prev)
2061 					view = prev;
2062 				else if (!TAILQ_EMPTY(&views)) {
2063 					view = TAILQ_LAST(&views,
2064 					    tog_view_list_head);
2065 				}
2066 				if (view) {
2067 					if (view->focus_child) {
2068 						view->child->focussed = 1;
2069 						view = view->child;
2070 					} else
2071 						view->focussed = 1;
2072 				}
2073 			}
2074 		}
2075 		if (new_view) {
2076 			struct tog_view *v, *t;
2077 			/* Only allow one parent view per type. */
2078 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2079 				if (v->type != new_view->type)
2080 					continue;
2081 				TAILQ_REMOVE(&views, v, entry);
2082 				err = view_close(v);
2083 				if (err)
2084 					goto done;
2085 				break;
2086 			}
2087 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2088 			view = new_view;
2089 		}
2090 		if (view && !done) {
2091 			if (view_is_parent_view(view)) {
2092 				if (view->child && view->child->focussed)
2093 					view = view->child;
2094 			} else {
2095 				if (view->parent && view->parent->focussed)
2096 					view = view->parent;
2097 			}
2098 			show_panel(view->panel);
2099 			if (view->child && view_is_splitscreen(view->child))
2100 				show_panel(view->child->panel);
2101 			if (view->parent && view_is_splitscreen(view)) {
2102 				err = view->parent->show(view->parent);
2103 				if (err)
2104 					goto done;
2105 			}
2106 			err = view->show(view);
2107 			if (err)
2108 				goto done;
2109 			if (view->child) {
2110 				err = view->child->show(view->child);
2111 				if (err)
2112 					goto done;
2113 			}
2114 			update_panels();
2115 			doupdate();
2116 		}
2117 	}
2118 done:
2119 	while (!TAILQ_EMPTY(&views)) {
2120 		const struct got_error *close_err;
2121 		view = TAILQ_FIRST(&views);
2122 		TAILQ_REMOVE(&views, view, entry);
2123 		close_err = view_close(view);
2124 		if (close_err && err == NULL)
2125 			err = close_err;
2126 	}
2127 
2128 	errcode = pthread_mutex_unlock(&tog_mutex);
2129 	if (errcode && err == NULL)
2130 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2131 
2132 	return err;
2133 }
2134 
2135 __dead static void
2136 usage_log(void)
2137 {
2138 	endwin();
2139 	fprintf(stderr,
2140 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2141 	    getprogname());
2142 	exit(1);
2143 }
2144 
2145 /* Create newly allocated wide-character string equivalent to a byte string. */
2146 static const struct got_error *
2147 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2148 {
2149 	char *vis = NULL;
2150 	const struct got_error *err = NULL;
2151 
2152 	*ws = NULL;
2153 	*wlen = mbstowcs(NULL, s, 0);
2154 	if (*wlen == (size_t)-1) {
2155 		int vislen;
2156 		if (errno != EILSEQ)
2157 			return got_error_from_errno("mbstowcs");
2158 
2159 		/* byte string invalid in current encoding; try to "fix" it */
2160 		err = got_mbsavis(&vis, &vislen, s);
2161 		if (err)
2162 			return err;
2163 		*wlen = mbstowcs(NULL, vis, 0);
2164 		if (*wlen == (size_t)-1) {
2165 			err = got_error_from_errno("mbstowcs"); /* give up */
2166 			goto done;
2167 		}
2168 	}
2169 
2170 	*ws = calloc(*wlen + 1, sizeof(**ws));
2171 	if (*ws == NULL) {
2172 		err = got_error_from_errno("calloc");
2173 		goto done;
2174 	}
2175 
2176 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2177 		err = got_error_from_errno("mbstowcs");
2178 done:
2179 	free(vis);
2180 	if (err) {
2181 		free(*ws);
2182 		*ws = NULL;
2183 		*wlen = 0;
2184 	}
2185 	return err;
2186 }
2187 
2188 static const struct got_error *
2189 expand_tab(char **ptr, const char *src)
2190 {
2191 	char	*dst;
2192 	size_t	 len, n, idx = 0, sz = 0;
2193 
2194 	*ptr = NULL;
2195 	n = len = strlen(src);
2196 	dst = malloc(n + 1);
2197 	if (dst == NULL)
2198 		return got_error_from_errno("malloc");
2199 
2200 	while (idx < len && src[idx]) {
2201 		const char c = src[idx];
2202 
2203 		if (c == '\t') {
2204 			size_t nb = TABSIZE - sz % TABSIZE;
2205 			char *p;
2206 
2207 			p = realloc(dst, n + nb);
2208 			if (p == NULL) {
2209 				free(dst);
2210 				return got_error_from_errno("realloc");
2211 
2212 			}
2213 			dst = p;
2214 			n += nb;
2215 			memset(dst + sz, ' ', nb);
2216 			sz += nb;
2217 		} else
2218 			dst[sz++] = src[idx];
2219 		++idx;
2220 	}
2221 
2222 	dst[sz] = '\0';
2223 	*ptr = dst;
2224 	return NULL;
2225 }
2226 
2227 /*
2228  * Advance at most n columns from wline starting at offset off.
2229  * Return the index to the first character after the span operation.
2230  * Return the combined column width of all spanned wide character in
2231  * *rcol.
2232  */
2233 static int
2234 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2235 {
2236 	int width, i, cols = 0;
2237 
2238 	if (n == 0) {
2239 		*rcol = cols;
2240 		return off;
2241 	}
2242 
2243 	for (i = off; wline[i] != L'\0'; ++i) {
2244 		if (wline[i] == L'\t')
2245 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2246 		else
2247 			width = wcwidth(wline[i]);
2248 
2249 		if (width == -1) {
2250 			width = 1;
2251 			wline[i] = L'.';
2252 		}
2253 
2254 		if (cols + width > n)
2255 			break;
2256 		cols += width;
2257 	}
2258 
2259 	*rcol = cols;
2260 	return i;
2261 }
2262 
2263 /*
2264  * Format a line for display, ensuring that it won't overflow a width limit.
2265  * With scrolling, the width returned refers to the scrolled version of the
2266  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2267  */
2268 static const struct got_error *
2269 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2270     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2271 {
2272 	const struct got_error *err = NULL;
2273 	int cols;
2274 	wchar_t *wline = NULL;
2275 	char *exstr = NULL;
2276 	size_t wlen;
2277 	int i, scrollx;
2278 
2279 	*wlinep = NULL;
2280 	*widthp = 0;
2281 
2282 	if (expand) {
2283 		err = expand_tab(&exstr, line);
2284 		if (err)
2285 			return err;
2286 	}
2287 
2288 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2289 	free(exstr);
2290 	if (err)
2291 		return err;
2292 
2293 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2294 
2295 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2296 		wline[wlen - 1] = L'\0';
2297 		wlen--;
2298 	}
2299 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2300 		wline[wlen - 1] = L'\0';
2301 		wlen--;
2302 	}
2303 
2304 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2305 	wline[i] = L'\0';
2306 
2307 	if (widthp)
2308 		*widthp = cols;
2309 	if (scrollxp)
2310 		*scrollxp = scrollx;
2311 	if (err)
2312 		free(wline);
2313 	else
2314 		*wlinep = wline;
2315 	return err;
2316 }
2317 
2318 static const struct got_error*
2319 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2320     struct got_object_id *id, struct got_repository *repo)
2321 {
2322 	static const struct got_error *err = NULL;
2323 	struct got_reflist_entry *re;
2324 	char *s;
2325 	const char *name;
2326 
2327 	*refs_str = NULL;
2328 
2329 	TAILQ_FOREACH(re, refs, entry) {
2330 		struct got_tag_object *tag = NULL;
2331 		struct got_object_id *ref_id;
2332 		int cmp;
2333 
2334 		name = got_ref_get_name(re->ref);
2335 		if (strcmp(name, GOT_REF_HEAD) == 0)
2336 			continue;
2337 		if (strncmp(name, "refs/", 5) == 0)
2338 			name += 5;
2339 		if (strncmp(name, "got/", 4) == 0 &&
2340 		    strncmp(name, "got/backup/", 11) != 0)
2341 			continue;
2342 		if (strncmp(name, "heads/", 6) == 0)
2343 			name += 6;
2344 		if (strncmp(name, "remotes/", 8) == 0) {
2345 			name += 8;
2346 			s = strstr(name, "/" GOT_REF_HEAD);
2347 			if (s != NULL && s[strlen(s)] == '\0')
2348 				continue;
2349 		}
2350 		err = got_ref_resolve(&ref_id, repo, re->ref);
2351 		if (err)
2352 			break;
2353 		if (strncmp(name, "tags/", 5) == 0) {
2354 			err = got_object_open_as_tag(&tag, repo, ref_id);
2355 			if (err) {
2356 				if (err->code != GOT_ERR_OBJ_TYPE) {
2357 					free(ref_id);
2358 					break;
2359 				}
2360 				/* Ref points at something other than a tag. */
2361 				err = NULL;
2362 				tag = NULL;
2363 			}
2364 		}
2365 		cmp = got_object_id_cmp(tag ?
2366 		    got_object_tag_get_object_id(tag) : ref_id, id);
2367 		free(ref_id);
2368 		if (tag)
2369 			got_object_tag_close(tag);
2370 		if (cmp != 0)
2371 			continue;
2372 		s = *refs_str;
2373 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2374 		    s ? ", " : "", name) == -1) {
2375 			err = got_error_from_errno("asprintf");
2376 			free(s);
2377 			*refs_str = NULL;
2378 			break;
2379 		}
2380 		free(s);
2381 	}
2382 
2383 	return err;
2384 }
2385 
2386 static const struct got_error *
2387 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2388     int col_tab_align)
2389 {
2390 	char *smallerthan;
2391 
2392 	smallerthan = strchr(author, '<');
2393 	if (smallerthan && smallerthan[1] != '\0')
2394 		author = smallerthan + 1;
2395 	author[strcspn(author, "@>")] = '\0';
2396 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2397 	    col_tab_align, 0);
2398 }
2399 
2400 static const struct got_error *
2401 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2402     struct got_object_id *id, const size_t date_display_cols,
2403     int author_display_cols)
2404 {
2405 	struct tog_log_view_state *s = &view->state.log;
2406 	const struct got_error *err = NULL;
2407 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2408 	char *logmsg0 = NULL, *logmsg = NULL;
2409 	char *author = NULL;
2410 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
2411 	int author_width, logmsg_width;
2412 	char *newline, *line = NULL;
2413 	int col, limit, scrollx;
2414 	const int avail = view->ncols;
2415 	struct tm tm;
2416 	time_t committer_time;
2417 	struct tog_color *tc;
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 	limit = avail - col;
2498 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2499 		limit--;	/* for the border */
2500 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2501 	    limit, col, 1);
2502 	if (err)
2503 		goto done;
2504 	waddwstr(view->window, &wlogmsg[scrollx]);
2505 	col += MAX(logmsg_width, 0);
2506 	while (col < avail) {
2507 		waddch(view->window, ' ');
2508 		col++;
2509 	}
2510 done:
2511 	free(logmsg0);
2512 	free(wlogmsg);
2513 	free(author);
2514 	free(wauthor);
2515 	free(line);
2516 	return err;
2517 }
2518 
2519 static struct commit_queue_entry *
2520 alloc_commit_queue_entry(struct got_commit_object *commit,
2521     struct got_object_id *id)
2522 {
2523 	struct commit_queue_entry *entry;
2524 	struct got_object_id *dup;
2525 
2526 	entry = calloc(1, sizeof(*entry));
2527 	if (entry == NULL)
2528 		return NULL;
2529 
2530 	dup = got_object_id_dup(id);
2531 	if (dup == NULL) {
2532 		free(entry);
2533 		return NULL;
2534 	}
2535 
2536 	entry->id = dup;
2537 	entry->commit = commit;
2538 	return entry;
2539 }
2540 
2541 static void
2542 pop_commit(struct commit_queue *commits)
2543 {
2544 	struct commit_queue_entry *entry;
2545 
2546 	entry = TAILQ_FIRST(&commits->head);
2547 	TAILQ_REMOVE(&commits->head, entry, entry);
2548 	got_object_commit_close(entry->commit);
2549 	commits->ncommits--;
2550 	free(entry->id);
2551 	free(entry);
2552 }
2553 
2554 static void
2555 free_commits(struct commit_queue *commits)
2556 {
2557 	while (!TAILQ_EMPTY(&commits->head))
2558 		pop_commit(commits);
2559 }
2560 
2561 static const struct got_error *
2562 match_commit(int *have_match, struct got_object_id *id,
2563     struct got_commit_object *commit, regex_t *regex)
2564 {
2565 	const struct got_error *err = NULL;
2566 	regmatch_t regmatch;
2567 	char *id_str = NULL, *logmsg = NULL;
2568 
2569 	*have_match = 0;
2570 
2571 	err = got_object_id_str(&id_str, id);
2572 	if (err)
2573 		return err;
2574 
2575 	err = got_object_commit_get_logmsg(&logmsg, commit);
2576 	if (err)
2577 		goto done;
2578 
2579 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2580 	    &regmatch, 0) == 0 ||
2581 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2582 	    &regmatch, 0) == 0 ||
2583 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2584 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2585 		*have_match = 1;
2586 done:
2587 	free(id_str);
2588 	free(logmsg);
2589 	return err;
2590 }
2591 
2592 static const struct got_error *
2593 queue_commits(struct tog_log_thread_args *a)
2594 {
2595 	const struct got_error *err = NULL;
2596 
2597 	/*
2598 	 * We keep all commits open throughout the lifetime of the log
2599 	 * view in order to avoid having to re-fetch commits from disk
2600 	 * while updating the display.
2601 	 */
2602 	do {
2603 		struct got_object_id id;
2604 		struct got_commit_object *commit;
2605 		struct commit_queue_entry *entry;
2606 		int limit_match = 0;
2607 		int errcode;
2608 
2609 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2610 		    NULL, NULL);
2611 		if (err)
2612 			break;
2613 
2614 		err = got_object_open_as_commit(&commit, a->repo, &id);
2615 		if (err)
2616 			break;
2617 		entry = alloc_commit_queue_entry(commit, &id);
2618 		if (entry == NULL) {
2619 			err = got_error_from_errno("alloc_commit_queue_entry");
2620 			break;
2621 		}
2622 
2623 		errcode = pthread_mutex_lock(&tog_mutex);
2624 		if (errcode) {
2625 			err = got_error_set_errno(errcode,
2626 			    "pthread_mutex_lock");
2627 			break;
2628 		}
2629 
2630 		entry->idx = a->real_commits->ncommits;
2631 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2632 		a->real_commits->ncommits++;
2633 
2634 		if (*a->limiting) {
2635 			err = match_commit(&limit_match, &id, commit,
2636 			    a->limit_regex);
2637 			if (err)
2638 				break;
2639 
2640 			if (limit_match) {
2641 				struct commit_queue_entry *matched;
2642 
2643 				matched = alloc_commit_queue_entry(
2644 				    entry->commit, entry->id);
2645 				if (matched == NULL) {
2646 					err = got_error_from_errno(
2647 					    "alloc_commit_queue_entry");
2648 					break;
2649 				}
2650 				matched->commit = entry->commit;
2651 				got_object_commit_retain(entry->commit);
2652 
2653 				matched->idx = a->limit_commits->ncommits;
2654 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2655 				    matched, entry);
2656 				a->limit_commits->ncommits++;
2657 			}
2658 
2659 			/*
2660 			 * This is how we signal log_thread() that we
2661 			 * have found a match, and that it should be
2662 			 * counted as a new entry for the view.
2663 			 */
2664 			a->limit_match = limit_match;
2665 		}
2666 
2667 		if (*a->searching == TOG_SEARCH_FORWARD &&
2668 		    !*a->search_next_done) {
2669 			int have_match;
2670 			err = match_commit(&have_match, &id, commit, a->regex);
2671 			if (err)
2672 				break;
2673 
2674 			if (*a->limiting) {
2675 				if (limit_match && have_match)
2676 					*a->search_next_done =
2677 					    TOG_SEARCH_HAVE_MORE;
2678 			} else if (have_match)
2679 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2680 		}
2681 
2682 		errcode = pthread_mutex_unlock(&tog_mutex);
2683 		if (errcode && err == NULL)
2684 			err = got_error_set_errno(errcode,
2685 			    "pthread_mutex_unlock");
2686 		if (err)
2687 			break;
2688 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2689 
2690 	return err;
2691 }
2692 
2693 static void
2694 select_commit(struct tog_log_view_state *s)
2695 {
2696 	struct commit_queue_entry *entry;
2697 	int ncommits = 0;
2698 
2699 	entry = s->first_displayed_entry;
2700 	while (entry) {
2701 		if (ncommits == s->selected) {
2702 			s->selected_entry = entry;
2703 			break;
2704 		}
2705 		entry = TAILQ_NEXT(entry, entry);
2706 		ncommits++;
2707 	}
2708 }
2709 
2710 static const struct got_error *
2711 draw_commits(struct tog_view *view)
2712 {
2713 	const struct got_error *err = NULL;
2714 	struct tog_log_view_state *s = &view->state.log;
2715 	struct commit_queue_entry *entry = s->selected_entry;
2716 	int limit = view->nlines;
2717 	int width;
2718 	int ncommits, author_cols = 4;
2719 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2720 	char *refs_str = NULL;
2721 	wchar_t *wline;
2722 	struct tog_color *tc;
2723 	static const size_t date_display_cols = 12;
2724 
2725 	if (view_is_hsplit_top(view))
2726 		--limit;  /* account for border */
2727 
2728 	if (s->selected_entry &&
2729 	    !(view->searching && view->search_next_done == 0)) {
2730 		struct got_reflist_head *refs;
2731 		err = got_object_id_str(&id_str, s->selected_entry->id);
2732 		if (err)
2733 			return err;
2734 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2735 		    s->selected_entry->id);
2736 		if (refs) {
2737 			err = build_refs_str(&refs_str, refs,
2738 			    s->selected_entry->id, s->repo);
2739 			if (err)
2740 				goto done;
2741 		}
2742 	}
2743 
2744 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2745 		halfdelay(10); /* disable fast refresh */
2746 
2747 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2748 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2749 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2750 		    (view->searching && !view->search_next_done) ?
2751 		    "searching..." : "loading...") == -1) {
2752 			err = got_error_from_errno("asprintf");
2753 			goto done;
2754 		}
2755 	} else {
2756 		const char *search_str = NULL;
2757 		const char *limit_str = NULL;
2758 
2759 		if (view->searching) {
2760 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2761 				search_str = "no more matches";
2762 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2763 				search_str = "no matches found";
2764 			else if (!view->search_next_done)
2765 				search_str = "searching...";
2766 		}
2767 
2768 		if (s->limit_view && s->commits->ncommits == 0)
2769 			limit_str = "no matches found";
2770 
2771 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2772 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2773 		    search_str ? search_str : (refs_str ? refs_str : ""),
2774 		    limit_str ? limit_str : "") == -1) {
2775 			err = got_error_from_errno("asprintf");
2776 			goto done;
2777 		}
2778 	}
2779 
2780 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2781 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2782 		    "........................................",
2783 		    s->in_repo_path, ncommits_str) == -1) {
2784 			err = got_error_from_errno("asprintf");
2785 			header = NULL;
2786 			goto done;
2787 		}
2788 	} else if (asprintf(&header, "commit %s%s",
2789 	    id_str ? id_str : "........................................",
2790 	    ncommits_str) == -1) {
2791 		err = got_error_from_errno("asprintf");
2792 		header = NULL;
2793 		goto done;
2794 	}
2795 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2796 	if (err)
2797 		goto done;
2798 
2799 	werase(view->window);
2800 
2801 	if (view_needs_focus_indication(view))
2802 		wstandout(view->window);
2803 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2804 	if (tc)
2805 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2806 	waddwstr(view->window, wline);
2807 	while (width < view->ncols) {
2808 		waddch(view->window, ' ');
2809 		width++;
2810 	}
2811 	if (tc)
2812 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2813 	if (view_needs_focus_indication(view))
2814 		wstandend(view->window);
2815 	free(wline);
2816 	if (limit <= 1)
2817 		goto done;
2818 
2819 	/* Grow author column size if necessary, and set view->maxx. */
2820 	entry = s->first_displayed_entry;
2821 	ncommits = 0;
2822 	view->maxx = 0;
2823 	while (entry) {
2824 		struct got_commit_object *c = entry->commit;
2825 		char *author, *eol, *msg, *msg0;
2826 		wchar_t *wauthor, *wmsg;
2827 		int width;
2828 		if (ncommits >= limit - 1)
2829 			break;
2830 		if (s->use_committer)
2831 			author = strdup(got_object_commit_get_committer(c));
2832 		else
2833 			author = strdup(got_object_commit_get_author(c));
2834 		if (author == NULL) {
2835 			err = got_error_from_errno("strdup");
2836 			goto done;
2837 		}
2838 		err = format_author(&wauthor, &width, author, COLS,
2839 		    date_display_cols);
2840 		if (author_cols < width)
2841 			author_cols = width;
2842 		free(wauthor);
2843 		free(author);
2844 		if (err)
2845 			goto done;
2846 		err = got_object_commit_get_logmsg(&msg0, c);
2847 		if (err)
2848 			goto done;
2849 		msg = msg0;
2850 		while (*msg == '\n')
2851 			++msg;
2852 		if ((eol = strchr(msg, '\n')))
2853 			*eol = '\0';
2854 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2855 		    date_display_cols + author_cols, 0);
2856 		if (err)
2857 			goto done;
2858 		view->maxx = MAX(view->maxx, width);
2859 		free(msg0);
2860 		free(wmsg);
2861 		ncommits++;
2862 		entry = TAILQ_NEXT(entry, entry);
2863 	}
2864 
2865 	entry = s->first_displayed_entry;
2866 	s->last_displayed_entry = s->first_displayed_entry;
2867 	ncommits = 0;
2868 	while (entry) {
2869 		if (ncommits >= limit - 1)
2870 			break;
2871 		if (ncommits == s->selected)
2872 			wstandout(view->window);
2873 		err = draw_commit(view, entry->commit, entry->id,
2874 		    date_display_cols, author_cols);
2875 		if (ncommits == s->selected)
2876 			wstandend(view->window);
2877 		if (err)
2878 			goto done;
2879 		ncommits++;
2880 		s->last_displayed_entry = entry;
2881 		entry = TAILQ_NEXT(entry, entry);
2882 	}
2883 
2884 	view_border(view);
2885 done:
2886 	free(id_str);
2887 	free(refs_str);
2888 	free(ncommits_str);
2889 	free(header);
2890 	return err;
2891 }
2892 
2893 static void
2894 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2895 {
2896 	struct commit_queue_entry *entry;
2897 	int nscrolled = 0;
2898 
2899 	entry = TAILQ_FIRST(&s->commits->head);
2900 	if (s->first_displayed_entry == entry)
2901 		return;
2902 
2903 	entry = s->first_displayed_entry;
2904 	while (entry && nscrolled < maxscroll) {
2905 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2906 		if (entry) {
2907 			s->first_displayed_entry = entry;
2908 			nscrolled++;
2909 		}
2910 	}
2911 }
2912 
2913 static const struct got_error *
2914 trigger_log_thread(struct tog_view *view, int wait)
2915 {
2916 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2917 	int errcode;
2918 
2919 	if (!using_mock_io)
2920 		halfdelay(1); /* fast refresh while loading commits */
2921 
2922 	while (!ta->log_complete && !tog_thread_error &&
2923 	    (ta->commits_needed > 0 || ta->load_all)) {
2924 		/* Wake the log thread. */
2925 		errcode = pthread_cond_signal(&ta->need_commits);
2926 		if (errcode)
2927 			return got_error_set_errno(errcode,
2928 			    "pthread_cond_signal");
2929 
2930 		/*
2931 		 * The mutex will be released while the view loop waits
2932 		 * in wgetch(), at which time the log thread will run.
2933 		 */
2934 		if (!wait)
2935 			break;
2936 
2937 		/* Display progress update in log view. */
2938 		show_log_view(view);
2939 		update_panels();
2940 		doupdate();
2941 
2942 		/* Wait right here while next commit is being loaded. */
2943 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2944 		if (errcode)
2945 			return got_error_set_errno(errcode,
2946 			    "pthread_cond_wait");
2947 
2948 		/* Display progress update in log view. */
2949 		show_log_view(view);
2950 		update_panels();
2951 		doupdate();
2952 	}
2953 
2954 	return NULL;
2955 }
2956 
2957 static const struct got_error *
2958 request_log_commits(struct tog_view *view)
2959 {
2960 	struct tog_log_view_state	*state = &view->state.log;
2961 	const struct got_error		*err = NULL;
2962 
2963 	if (state->thread_args.log_complete)
2964 		return NULL;
2965 
2966 	state->thread_args.commits_needed += view->nscrolled;
2967 	err = trigger_log_thread(view, 1);
2968 	view->nscrolled = 0;
2969 
2970 	return err;
2971 }
2972 
2973 static const struct got_error *
2974 log_scroll_down(struct tog_view *view, int maxscroll)
2975 {
2976 	struct tog_log_view_state *s = &view->state.log;
2977 	const struct got_error *err = NULL;
2978 	struct commit_queue_entry *pentry;
2979 	int nscrolled = 0, ncommits_needed;
2980 
2981 	if (s->last_displayed_entry == NULL)
2982 		return NULL;
2983 
2984 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2985 	if (s->commits->ncommits < ncommits_needed &&
2986 	    !s->thread_args.log_complete) {
2987 		/*
2988 		 * Ask the log thread for required amount of commits.
2989 		 */
2990 		s->thread_args.commits_needed +=
2991 		    ncommits_needed - s->commits->ncommits;
2992 		err = trigger_log_thread(view, 1);
2993 		if (err)
2994 			return err;
2995 	}
2996 
2997 	do {
2998 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2999 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3000 			break;
3001 
3002 		s->last_displayed_entry = pentry ?
3003 		    pentry : s->last_displayed_entry;
3004 
3005 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3006 		if (pentry == NULL)
3007 			break;
3008 		s->first_displayed_entry = pentry;
3009 	} while (++nscrolled < maxscroll);
3010 
3011 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3012 		view->nscrolled += nscrolled;
3013 	else
3014 		view->nscrolled = 0;
3015 
3016 	return err;
3017 }
3018 
3019 static const struct got_error *
3020 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3021     struct got_commit_object *commit, struct got_object_id *commit_id,
3022     struct tog_view *log_view, struct got_repository *repo)
3023 {
3024 	const struct got_error *err;
3025 	struct got_object_qid *parent_id;
3026 	struct tog_view *diff_view;
3027 
3028 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3029 	if (diff_view == NULL)
3030 		return got_error_from_errno("view_open");
3031 
3032 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3033 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3034 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3035 	if (err == NULL)
3036 		*new_view = diff_view;
3037 	return err;
3038 }
3039 
3040 static const struct got_error *
3041 tree_view_visit_subtree(struct tog_tree_view_state *s,
3042     struct got_tree_object *subtree)
3043 {
3044 	struct tog_parent_tree *parent;
3045 
3046 	parent = calloc(1, sizeof(*parent));
3047 	if (parent == NULL)
3048 		return got_error_from_errno("calloc");
3049 
3050 	parent->tree = s->tree;
3051 	parent->first_displayed_entry = s->first_displayed_entry;
3052 	parent->selected_entry = s->selected_entry;
3053 	parent->selected = s->selected;
3054 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3055 	s->tree = subtree;
3056 	s->selected = 0;
3057 	s->first_displayed_entry = NULL;
3058 	return NULL;
3059 }
3060 
3061 static const struct got_error *
3062 tree_view_walk_path(struct tog_tree_view_state *s,
3063     struct got_commit_object *commit, const char *path)
3064 {
3065 	const struct got_error *err = NULL;
3066 	struct got_tree_object *tree = NULL;
3067 	const char *p;
3068 	char *slash, *subpath = NULL;
3069 
3070 	/* Walk the path and open corresponding tree objects. */
3071 	p = path;
3072 	while (*p) {
3073 		struct got_tree_entry *te;
3074 		struct got_object_id *tree_id;
3075 		char *te_name;
3076 
3077 		while (p[0] == '/')
3078 			p++;
3079 
3080 		/* Ensure the correct subtree entry is selected. */
3081 		slash = strchr(p, '/');
3082 		if (slash == NULL)
3083 			te_name = strdup(p);
3084 		else
3085 			te_name = strndup(p, slash - p);
3086 		if (te_name == NULL) {
3087 			err = got_error_from_errno("strndup");
3088 			break;
3089 		}
3090 		te = got_object_tree_find_entry(s->tree, te_name);
3091 		if (te == NULL) {
3092 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3093 			free(te_name);
3094 			break;
3095 		}
3096 		free(te_name);
3097 		s->first_displayed_entry = s->selected_entry = te;
3098 
3099 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3100 			break; /* jump to this file's entry */
3101 
3102 		slash = strchr(p, '/');
3103 		if (slash)
3104 			subpath = strndup(path, slash - path);
3105 		else
3106 			subpath = strdup(path);
3107 		if (subpath == NULL) {
3108 			err = got_error_from_errno("strdup");
3109 			break;
3110 		}
3111 
3112 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3113 		    subpath);
3114 		if (err)
3115 			break;
3116 
3117 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3118 		free(tree_id);
3119 		if (err)
3120 			break;
3121 
3122 		err = tree_view_visit_subtree(s, tree);
3123 		if (err) {
3124 			got_object_tree_close(tree);
3125 			break;
3126 		}
3127 		if (slash == NULL)
3128 			break;
3129 		free(subpath);
3130 		subpath = NULL;
3131 		p = slash;
3132 	}
3133 
3134 	free(subpath);
3135 	return err;
3136 }
3137 
3138 static const struct got_error *
3139 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3140     struct commit_queue_entry *entry, const char *path,
3141     const char *head_ref_name, struct got_repository *repo)
3142 {
3143 	const struct got_error *err = NULL;
3144 	struct tog_tree_view_state *s;
3145 	struct tog_view *tree_view;
3146 
3147 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3148 	if (tree_view == NULL)
3149 		return got_error_from_errno("view_open");
3150 
3151 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3152 	if (err)
3153 		return err;
3154 	s = &tree_view->state.tree;
3155 
3156 	*new_view = tree_view;
3157 
3158 	if (got_path_is_root_dir(path))
3159 		return NULL;
3160 
3161 	return tree_view_walk_path(s, entry->commit, path);
3162 }
3163 
3164 static const struct got_error *
3165 block_signals_used_by_main_thread(void)
3166 {
3167 	sigset_t sigset;
3168 	int errcode;
3169 
3170 	if (sigemptyset(&sigset) == -1)
3171 		return got_error_from_errno("sigemptyset");
3172 
3173 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3174 	if (sigaddset(&sigset, SIGWINCH) == -1)
3175 		return got_error_from_errno("sigaddset");
3176 	if (sigaddset(&sigset, SIGCONT) == -1)
3177 		return got_error_from_errno("sigaddset");
3178 	if (sigaddset(&sigset, SIGINT) == -1)
3179 		return got_error_from_errno("sigaddset");
3180 	if (sigaddset(&sigset, SIGTERM) == -1)
3181 		return got_error_from_errno("sigaddset");
3182 
3183 	/* ncurses handles SIGTSTP */
3184 	if (sigaddset(&sigset, SIGTSTP) == -1)
3185 		return got_error_from_errno("sigaddset");
3186 
3187 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3188 	if (errcode)
3189 		return got_error_set_errno(errcode, "pthread_sigmask");
3190 
3191 	return NULL;
3192 }
3193 
3194 static void *
3195 log_thread(void *arg)
3196 {
3197 	const struct got_error *err = NULL;
3198 	int errcode = 0;
3199 	struct tog_log_thread_args *a = arg;
3200 	int done = 0;
3201 
3202 	/*
3203 	 * Sync startup with main thread such that we begin our
3204 	 * work once view_input() has released the mutex.
3205 	 */
3206 	errcode = pthread_mutex_lock(&tog_mutex);
3207 	if (errcode) {
3208 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3209 		return (void *)err;
3210 	}
3211 
3212 	err = block_signals_used_by_main_thread();
3213 	if (err) {
3214 		pthread_mutex_unlock(&tog_mutex);
3215 		goto done;
3216 	}
3217 
3218 	while (!done && !err && !tog_fatal_signal_received()) {
3219 		errcode = pthread_mutex_unlock(&tog_mutex);
3220 		if (errcode) {
3221 			err = got_error_set_errno(errcode,
3222 			    "pthread_mutex_unlock");
3223 			goto done;
3224 		}
3225 		err = queue_commits(a);
3226 		if (err) {
3227 			if (err->code != GOT_ERR_ITER_COMPLETED)
3228 				goto done;
3229 			err = NULL;
3230 			done = 1;
3231 		} else if (a->commits_needed > 0 && !a->load_all) {
3232 			if (*a->limiting) {
3233 				if (a->limit_match)
3234 					a->commits_needed--;
3235 			} else
3236 				a->commits_needed--;
3237 		}
3238 
3239 		errcode = pthread_mutex_lock(&tog_mutex);
3240 		if (errcode) {
3241 			err = got_error_set_errno(errcode,
3242 			    "pthread_mutex_lock");
3243 			goto done;
3244 		} else if (*a->quit)
3245 			done = 1;
3246 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3247 			*a->first_displayed_entry =
3248 			    TAILQ_FIRST(&a->limit_commits->head);
3249 			*a->selected_entry = *a->first_displayed_entry;
3250 		} else if (*a->first_displayed_entry == NULL) {
3251 			*a->first_displayed_entry =
3252 			    TAILQ_FIRST(&a->real_commits->head);
3253 			*a->selected_entry = *a->first_displayed_entry;
3254 		}
3255 
3256 		errcode = pthread_cond_signal(&a->commit_loaded);
3257 		if (errcode) {
3258 			err = got_error_set_errno(errcode,
3259 			    "pthread_cond_signal");
3260 			pthread_mutex_unlock(&tog_mutex);
3261 			goto done;
3262 		}
3263 
3264 		if (done)
3265 			a->commits_needed = 0;
3266 		else {
3267 			if (a->commits_needed == 0 && !a->load_all) {
3268 				errcode = pthread_cond_wait(&a->need_commits,
3269 				    &tog_mutex);
3270 				if (errcode) {
3271 					err = got_error_set_errno(errcode,
3272 					    "pthread_cond_wait");
3273 					pthread_mutex_unlock(&tog_mutex);
3274 					goto done;
3275 				}
3276 				if (*a->quit)
3277 					done = 1;
3278 			}
3279 		}
3280 	}
3281 	a->log_complete = 1;
3282 	errcode = pthread_mutex_unlock(&tog_mutex);
3283 	if (errcode)
3284 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3285 done:
3286 	if (err) {
3287 		tog_thread_error = 1;
3288 		pthread_cond_signal(&a->commit_loaded);
3289 	}
3290 	return (void *)err;
3291 }
3292 
3293 static const struct got_error *
3294 stop_log_thread(struct tog_log_view_state *s)
3295 {
3296 	const struct got_error *err = NULL, *thread_err = NULL;
3297 	int errcode;
3298 
3299 	if (s->thread) {
3300 		s->quit = 1;
3301 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3302 		if (errcode)
3303 			return got_error_set_errno(errcode,
3304 			    "pthread_cond_signal");
3305 		errcode = pthread_mutex_unlock(&tog_mutex);
3306 		if (errcode)
3307 			return got_error_set_errno(errcode,
3308 			    "pthread_mutex_unlock");
3309 		errcode = pthread_join(s->thread, (void **)&thread_err);
3310 		if (errcode)
3311 			return got_error_set_errno(errcode, "pthread_join");
3312 		errcode = pthread_mutex_lock(&tog_mutex);
3313 		if (errcode)
3314 			return got_error_set_errno(errcode,
3315 			    "pthread_mutex_lock");
3316 		s->thread = 0; //NULL;
3317 	}
3318 
3319 	if (s->thread_args.repo) {
3320 		err = got_repo_close(s->thread_args.repo);
3321 		s->thread_args.repo = NULL;
3322 	}
3323 
3324 	if (s->thread_args.pack_fds) {
3325 		const struct got_error *pack_err =
3326 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3327 		if (err == NULL)
3328 			err = pack_err;
3329 		s->thread_args.pack_fds = NULL;
3330 	}
3331 
3332 	if (s->thread_args.graph) {
3333 		got_commit_graph_close(s->thread_args.graph);
3334 		s->thread_args.graph = NULL;
3335 	}
3336 
3337 	return err ? err : thread_err;
3338 }
3339 
3340 static const struct got_error *
3341 close_log_view(struct tog_view *view)
3342 {
3343 	const struct got_error *err = NULL;
3344 	struct tog_log_view_state *s = &view->state.log;
3345 	int errcode;
3346 
3347 	err = stop_log_thread(s);
3348 
3349 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3350 	if (errcode && err == NULL)
3351 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3352 
3353 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3354 	if (errcode && err == NULL)
3355 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3356 
3357 	free_commits(&s->limit_commits);
3358 	free_commits(&s->real_commits);
3359 	free(s->in_repo_path);
3360 	s->in_repo_path = NULL;
3361 	free(s->start_id);
3362 	s->start_id = NULL;
3363 	free(s->head_ref_name);
3364 	s->head_ref_name = NULL;
3365 	return err;
3366 }
3367 
3368 /*
3369  * We use two queues to implement the limit feature: first consists of
3370  * commits matching the current limit_regex; second is the real queue
3371  * of all known commits (real_commits). When the user starts limiting,
3372  * we swap queues such that all movement and displaying functionality
3373  * works with very slight change.
3374  */
3375 static const struct got_error *
3376 limit_log_view(struct tog_view *view)
3377 {
3378 	struct tog_log_view_state *s = &view->state.log;
3379 	struct commit_queue_entry *entry;
3380 	struct tog_view	*v = view;
3381 	const struct got_error *err = NULL;
3382 	char pattern[1024];
3383 	int ret;
3384 
3385 	if (view_is_hsplit_top(view))
3386 		v = view->child;
3387 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3388 		v = view->parent;
3389 
3390 	/* Get the pattern */
3391 	wmove(v->window, v->nlines - 1, 0);
3392 	wclrtoeol(v->window);
3393 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3394 	nodelay(v->window, FALSE);
3395 	nocbreak();
3396 	echo();
3397 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3398 	cbreak();
3399 	noecho();
3400 	nodelay(v->window, TRUE);
3401 	if (ret == ERR)
3402 		return NULL;
3403 
3404 	if (*pattern == '\0') {
3405 		/*
3406 		 * Safety measure for the situation where the user
3407 		 * resets limit without previously limiting anything.
3408 		 */
3409 		if (!s->limit_view)
3410 			return NULL;
3411 
3412 		/*
3413 		 * User could have pressed Ctrl+L, which refreshed the
3414 		 * commit queues, it means we can't save previously
3415 		 * (before limit took place) displayed entries,
3416 		 * because they would point to already free'ed memory,
3417 		 * so we are forced to always select first entry of
3418 		 * the queue.
3419 		 */
3420 		s->commits = &s->real_commits;
3421 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3422 		s->selected_entry = s->first_displayed_entry;
3423 		s->selected = 0;
3424 		s->limit_view = 0;
3425 
3426 		return NULL;
3427 	}
3428 
3429 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3430 		return NULL;
3431 
3432 	s->limit_view = 1;
3433 
3434 	/* Clear the screen while loading limit view */
3435 	s->first_displayed_entry = NULL;
3436 	s->last_displayed_entry = NULL;
3437 	s->selected_entry = NULL;
3438 	s->commits = &s->limit_commits;
3439 
3440 	/* Prepare limit queue for new search */
3441 	free_commits(&s->limit_commits);
3442 	s->limit_commits.ncommits = 0;
3443 
3444 	/* First process commits, which are in queue already */
3445 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3446 		int have_match = 0;
3447 
3448 		err = match_commit(&have_match, entry->id,
3449 		    entry->commit, &s->limit_regex);
3450 		if (err)
3451 			return err;
3452 
3453 		if (have_match) {
3454 			struct commit_queue_entry *matched;
3455 
3456 			matched = alloc_commit_queue_entry(entry->commit,
3457 			    entry->id);
3458 			if (matched == NULL) {
3459 				err = got_error_from_errno(
3460 				    "alloc_commit_queue_entry");
3461 				break;
3462 			}
3463 			matched->commit = entry->commit;
3464 			got_object_commit_retain(entry->commit);
3465 
3466 			matched->idx = s->limit_commits.ncommits;
3467 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3468 			    matched, entry);
3469 			s->limit_commits.ncommits++;
3470 		}
3471 	}
3472 
3473 	/* Second process all the commits, until we fill the screen */
3474 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3475 	    !s->thread_args.log_complete) {
3476 		s->thread_args.commits_needed +=
3477 		    view->nlines - s->limit_commits.ncommits - 1;
3478 		err = trigger_log_thread(view, 1);
3479 		if (err)
3480 			return err;
3481 	}
3482 
3483 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3484 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3485 	s->selected = 0;
3486 
3487 	return NULL;
3488 }
3489 
3490 static const struct got_error *
3491 search_start_log_view(struct tog_view *view)
3492 {
3493 	struct tog_log_view_state *s = &view->state.log;
3494 
3495 	s->matched_entry = NULL;
3496 	s->search_entry = NULL;
3497 	return NULL;
3498 }
3499 
3500 static const struct got_error *
3501 search_next_log_view(struct tog_view *view)
3502 {
3503 	const struct got_error *err = NULL;
3504 	struct tog_log_view_state *s = &view->state.log;
3505 	struct commit_queue_entry *entry;
3506 
3507 	/* Display progress update in log view. */
3508 	show_log_view(view);
3509 	update_panels();
3510 	doupdate();
3511 
3512 	if (s->search_entry) {
3513 		int errcode, ch;
3514 		errcode = pthread_mutex_unlock(&tog_mutex);
3515 		if (errcode)
3516 			return got_error_set_errno(errcode,
3517 			    "pthread_mutex_unlock");
3518 		ch = wgetch(view->window);
3519 		errcode = pthread_mutex_lock(&tog_mutex);
3520 		if (errcode)
3521 			return got_error_set_errno(errcode,
3522 			    "pthread_mutex_lock");
3523 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3524 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3525 			return NULL;
3526 		}
3527 		if (view->searching == TOG_SEARCH_FORWARD)
3528 			entry = TAILQ_NEXT(s->search_entry, entry);
3529 		else
3530 			entry = TAILQ_PREV(s->search_entry,
3531 			    commit_queue_head, entry);
3532 	} else if (s->matched_entry) {
3533 		/*
3534 		 * If the user has moved the cursor after we hit a match,
3535 		 * the position from where we should continue searching
3536 		 * might have changed.
3537 		 */
3538 		if (view->searching == TOG_SEARCH_FORWARD)
3539 			entry = TAILQ_NEXT(s->selected_entry, entry);
3540 		else
3541 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3542 			    entry);
3543 	} else {
3544 		entry = s->selected_entry;
3545 	}
3546 
3547 	while (1) {
3548 		int have_match = 0;
3549 
3550 		if (entry == NULL) {
3551 			if (s->thread_args.log_complete ||
3552 			    view->searching == TOG_SEARCH_BACKWARD) {
3553 				view->search_next_done =
3554 				    (s->matched_entry == NULL ?
3555 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3556 				s->search_entry = NULL;
3557 				return NULL;
3558 			}
3559 			/*
3560 			 * Poke the log thread for more commits and return,
3561 			 * allowing the main loop to make progress. Search
3562 			 * will resume at s->search_entry once we come back.
3563 			 */
3564 			s->thread_args.commits_needed++;
3565 			return trigger_log_thread(view, 0);
3566 		}
3567 
3568 		err = match_commit(&have_match, entry->id, entry->commit,
3569 		    &view->regex);
3570 		if (err)
3571 			break;
3572 		if (have_match) {
3573 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3574 			s->matched_entry = entry;
3575 			break;
3576 		}
3577 
3578 		s->search_entry = entry;
3579 		if (view->searching == TOG_SEARCH_FORWARD)
3580 			entry = TAILQ_NEXT(entry, entry);
3581 		else
3582 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3583 	}
3584 
3585 	if (s->matched_entry) {
3586 		int cur = s->selected_entry->idx;
3587 		while (cur < s->matched_entry->idx) {
3588 			err = input_log_view(NULL, view, KEY_DOWN);
3589 			if (err)
3590 				return err;
3591 			cur++;
3592 		}
3593 		while (cur > s->matched_entry->idx) {
3594 			err = input_log_view(NULL, view, KEY_UP);
3595 			if (err)
3596 				return err;
3597 			cur--;
3598 		}
3599 	}
3600 
3601 	s->search_entry = NULL;
3602 
3603 	return NULL;
3604 }
3605 
3606 static const struct got_error *
3607 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3608     struct got_repository *repo, const char *head_ref_name,
3609     const char *in_repo_path, int log_branches)
3610 {
3611 	const struct got_error *err = NULL;
3612 	struct tog_log_view_state *s = &view->state.log;
3613 	struct got_repository *thread_repo = NULL;
3614 	struct got_commit_graph *thread_graph = NULL;
3615 	int errcode;
3616 
3617 	if (in_repo_path != s->in_repo_path) {
3618 		free(s->in_repo_path);
3619 		s->in_repo_path = strdup(in_repo_path);
3620 		if (s->in_repo_path == NULL) {
3621 			err = got_error_from_errno("strdup");
3622 			goto done;
3623 		}
3624 	}
3625 
3626 	/* The commit queue only contains commits being displayed. */
3627 	TAILQ_INIT(&s->real_commits.head);
3628 	s->real_commits.ncommits = 0;
3629 	s->commits = &s->real_commits;
3630 
3631 	TAILQ_INIT(&s->limit_commits.head);
3632 	s->limit_view = 0;
3633 	s->limit_commits.ncommits = 0;
3634 
3635 	s->repo = repo;
3636 	if (head_ref_name) {
3637 		s->head_ref_name = strdup(head_ref_name);
3638 		if (s->head_ref_name == NULL) {
3639 			err = got_error_from_errno("strdup");
3640 			goto done;
3641 		}
3642 	}
3643 	s->start_id = got_object_id_dup(start_id);
3644 	if (s->start_id == NULL) {
3645 		err = got_error_from_errno("got_object_id_dup");
3646 		goto done;
3647 	}
3648 	s->log_branches = log_branches;
3649 	s->use_committer = 1;
3650 
3651 	STAILQ_INIT(&s->colors);
3652 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3653 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3654 		    get_color_value("TOG_COLOR_COMMIT"));
3655 		if (err)
3656 			goto done;
3657 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3658 		    get_color_value("TOG_COLOR_AUTHOR"));
3659 		if (err) {
3660 			free_colors(&s->colors);
3661 			goto done;
3662 		}
3663 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3664 		    get_color_value("TOG_COLOR_DATE"));
3665 		if (err) {
3666 			free_colors(&s->colors);
3667 			goto done;
3668 		}
3669 	}
3670 
3671 	view->show = show_log_view;
3672 	view->input = input_log_view;
3673 	view->resize = resize_log_view;
3674 	view->close = close_log_view;
3675 	view->search_start = search_start_log_view;
3676 	view->search_next = search_next_log_view;
3677 
3678 	if (s->thread_args.pack_fds == NULL) {
3679 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3680 		if (err)
3681 			goto done;
3682 	}
3683 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3684 	    s->thread_args.pack_fds);
3685 	if (err)
3686 		goto done;
3687 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3688 	    !s->log_branches);
3689 	if (err)
3690 		goto done;
3691 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3692 	    s->repo, NULL, NULL);
3693 	if (err)
3694 		goto done;
3695 
3696 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3697 	if (errcode) {
3698 		err = got_error_set_errno(errcode, "pthread_cond_init");
3699 		goto done;
3700 	}
3701 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3702 	if (errcode) {
3703 		err = got_error_set_errno(errcode, "pthread_cond_init");
3704 		goto done;
3705 	}
3706 
3707 	s->thread_args.commits_needed = view->nlines;
3708 	s->thread_args.graph = thread_graph;
3709 	s->thread_args.real_commits = &s->real_commits;
3710 	s->thread_args.limit_commits = &s->limit_commits;
3711 	s->thread_args.in_repo_path = s->in_repo_path;
3712 	s->thread_args.start_id = s->start_id;
3713 	s->thread_args.repo = thread_repo;
3714 	s->thread_args.log_complete = 0;
3715 	s->thread_args.quit = &s->quit;
3716 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3717 	s->thread_args.selected_entry = &s->selected_entry;
3718 	s->thread_args.searching = &view->searching;
3719 	s->thread_args.search_next_done = &view->search_next_done;
3720 	s->thread_args.regex = &view->regex;
3721 	s->thread_args.limiting = &s->limit_view;
3722 	s->thread_args.limit_regex = &s->limit_regex;
3723 	s->thread_args.limit_commits = &s->limit_commits;
3724 done:
3725 	if (err) {
3726 		if (view->close == NULL)
3727 			close_log_view(view);
3728 		view_close(view);
3729 	}
3730 	return err;
3731 }
3732 
3733 static const struct got_error *
3734 show_log_view(struct tog_view *view)
3735 {
3736 	const struct got_error *err;
3737 	struct tog_log_view_state *s = &view->state.log;
3738 
3739 	if (s->thread == 0) { //NULL) {
3740 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3741 		    &s->thread_args);
3742 		if (errcode)
3743 			return got_error_set_errno(errcode, "pthread_create");
3744 		if (s->thread_args.commits_needed > 0) {
3745 			err = trigger_log_thread(view, 1);
3746 			if (err)
3747 				return err;
3748 		}
3749 	}
3750 
3751 	return draw_commits(view);
3752 }
3753 
3754 static void
3755 log_move_cursor_up(struct tog_view *view, int page, int home)
3756 {
3757 	struct tog_log_view_state *s = &view->state.log;
3758 
3759 	if (s->first_displayed_entry == NULL)
3760 		return;
3761 	if (s->selected_entry->idx == 0)
3762 		view->count = 0;
3763 
3764 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3765 	    || home)
3766 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3767 
3768 	if (!page && !home && s->selected > 0)
3769 		--s->selected;
3770 	else
3771 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3772 
3773 	select_commit(s);
3774 	return;
3775 }
3776 
3777 static const struct got_error *
3778 log_move_cursor_down(struct tog_view *view, int page)
3779 {
3780 	struct tog_log_view_state	*s = &view->state.log;
3781 	const struct got_error		*err = NULL;
3782 	int				 eos = view->nlines - 2;
3783 
3784 	if (s->first_displayed_entry == NULL)
3785 		return NULL;
3786 
3787 	if (s->thread_args.log_complete &&
3788 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3789 		return NULL;
3790 
3791 	if (view_is_hsplit_top(view))
3792 		--eos;  /* border consumes the last line */
3793 
3794 	if (!page) {
3795 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3796 			++s->selected;
3797 		else
3798 			err = log_scroll_down(view, 1);
3799 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3800 		struct commit_queue_entry *entry;
3801 		int n;
3802 
3803 		s->selected = 0;
3804 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3805 		s->last_displayed_entry = entry;
3806 		for (n = 0; n <= eos; n++) {
3807 			if (entry == NULL)
3808 				break;
3809 			s->first_displayed_entry = entry;
3810 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3811 		}
3812 		if (n > 0)
3813 			s->selected = n - 1;
3814 	} else {
3815 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3816 		    s->thread_args.log_complete)
3817 			s->selected += MIN(page,
3818 			    s->commits->ncommits - s->selected_entry->idx - 1);
3819 		else
3820 			err = log_scroll_down(view, page);
3821 	}
3822 	if (err)
3823 		return err;
3824 
3825 	/*
3826 	 * We might necessarily overshoot in horizontal
3827 	 * splits; if so, select the last displayed commit.
3828 	 */
3829 	if (s->first_displayed_entry && s->last_displayed_entry) {
3830 		s->selected = MIN(s->selected,
3831 		    s->last_displayed_entry->idx -
3832 		    s->first_displayed_entry->idx);
3833 	}
3834 
3835 	select_commit(s);
3836 
3837 	if (s->thread_args.log_complete &&
3838 	    s->selected_entry->idx == s->commits->ncommits - 1)
3839 		view->count = 0;
3840 
3841 	return NULL;
3842 }
3843 
3844 static void
3845 view_get_split(struct tog_view *view, int *y, int *x)
3846 {
3847 	*x = 0;
3848 	*y = 0;
3849 
3850 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3851 		if (view->child && view->child->resized_y)
3852 			*y = view->child->resized_y;
3853 		else if (view->resized_y)
3854 			*y = view->resized_y;
3855 		else
3856 			*y = view_split_begin_y(view->lines);
3857 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3858 		if (view->child && view->child->resized_x)
3859 			*x = view->child->resized_x;
3860 		else if (view->resized_x)
3861 			*x = view->resized_x;
3862 		else
3863 			*x = view_split_begin_x(view->begin_x);
3864 	}
3865 }
3866 
3867 /* Split view horizontally at y and offset view->state->selected line. */
3868 static const struct got_error *
3869 view_init_hsplit(struct tog_view *view, int y)
3870 {
3871 	const struct got_error *err = NULL;
3872 
3873 	view->nlines = y;
3874 	view->ncols = COLS;
3875 	err = view_resize(view);
3876 	if (err)
3877 		return err;
3878 
3879 	err = offset_selection_down(view);
3880 
3881 	return err;
3882 }
3883 
3884 static const struct got_error *
3885 log_goto_line(struct tog_view *view, int nlines)
3886 {
3887 	const struct got_error		*err = NULL;
3888 	struct tog_log_view_state	*s = &view->state.log;
3889 	int				 g, idx = s->selected_entry->idx;
3890 
3891 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3892 		return NULL;
3893 
3894 	g = view->gline;
3895 	view->gline = 0;
3896 
3897 	if (g >= s->first_displayed_entry->idx + 1 &&
3898 	    g <= s->last_displayed_entry->idx + 1 &&
3899 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3900 		s->selected = g - s->first_displayed_entry->idx - 1;
3901 		select_commit(s);
3902 		return NULL;
3903 	}
3904 
3905 	if (idx + 1 < g) {
3906 		err = log_move_cursor_down(view, g - idx - 1);
3907 		if (!err && g > s->selected_entry->idx + 1)
3908 			err = log_move_cursor_down(view,
3909 			    g - s->first_displayed_entry->idx - 1);
3910 		if (err)
3911 			return err;
3912 	} else if (idx + 1 > g)
3913 		log_move_cursor_up(view, idx - g + 1, 0);
3914 
3915 	if (g < nlines && s->first_displayed_entry->idx == 0)
3916 		s->selected = g - 1;
3917 
3918 	select_commit(s);
3919 	return NULL;
3920 
3921 }
3922 
3923 static void
3924 horizontal_scroll_input(struct tog_view *view, int ch)
3925 {
3926 
3927 	switch (ch) {
3928 	case KEY_LEFT:
3929 	case 'h':
3930 		view->x -= MIN(view->x, 2);
3931 		if (view->x <= 0)
3932 			view->count = 0;
3933 		break;
3934 	case KEY_RIGHT:
3935 	case 'l':
3936 		if (view->x + view->ncols / 2 < view->maxx)
3937 			view->x += 2;
3938 		else
3939 			view->count = 0;
3940 		break;
3941 	case '0':
3942 		view->x = 0;
3943 		break;
3944 	case '$':
3945 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3946 		view->count = 0;
3947 		break;
3948 	default:
3949 		break;
3950 	}
3951 }
3952 
3953 static const struct got_error *
3954 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3955 {
3956 	const struct got_error *err = NULL;
3957 	struct tog_log_view_state *s = &view->state.log;
3958 	int eos, nscroll;
3959 
3960 	if (s->thread_args.load_all) {
3961 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3962 			s->thread_args.load_all = 0;
3963 		else if (s->thread_args.log_complete) {
3964 			err = log_move_cursor_down(view, s->commits->ncommits);
3965 			s->thread_args.load_all = 0;
3966 		}
3967 		if (err)
3968 			return err;
3969 	}
3970 
3971 	eos = nscroll = view->nlines - 1;
3972 	if (view_is_hsplit_top(view))
3973 		--eos;  /* border */
3974 
3975 	if (view->gline)
3976 		return log_goto_line(view, eos);
3977 
3978 	switch (ch) {
3979 	case '&':
3980 		err = limit_log_view(view);
3981 		break;
3982 	case 'q':
3983 		s->quit = 1;
3984 		break;
3985 	case '0':
3986 	case '$':
3987 	case KEY_RIGHT:
3988 	case 'l':
3989 	case KEY_LEFT:
3990 	case 'h':
3991 		horizontal_scroll_input(view, ch);
3992 		break;
3993 	case 'k':
3994 	case KEY_UP:
3995 	case '<':
3996 	case ',':
3997 	case CTRL('p'):
3998 		log_move_cursor_up(view, 0, 0);
3999 		break;
4000 	case 'g':
4001 	case '=':
4002 	case KEY_HOME:
4003 		log_move_cursor_up(view, 0, 1);
4004 		view->count = 0;
4005 		break;
4006 	case CTRL('u'):
4007 	case 'u':
4008 		nscroll /= 2;
4009 		/* FALL THROUGH */
4010 	case KEY_PPAGE:
4011 	case CTRL('b'):
4012 	case 'b':
4013 		log_move_cursor_up(view, nscroll, 0);
4014 		break;
4015 	case 'j':
4016 	case KEY_DOWN:
4017 	case '>':
4018 	case '.':
4019 	case CTRL('n'):
4020 		err = log_move_cursor_down(view, 0);
4021 		break;
4022 	case '@':
4023 		s->use_committer = !s->use_committer;
4024 		view->action = s->use_committer ?
4025 		    "show committer" : "show commit author";
4026 		break;
4027 	case 'G':
4028 	case '*':
4029 	case KEY_END: {
4030 		/* We don't know yet how many commits, so we're forced to
4031 		 * traverse them all. */
4032 		view->count = 0;
4033 		s->thread_args.load_all = 1;
4034 		if (!s->thread_args.log_complete)
4035 			return trigger_log_thread(view, 0);
4036 		err = log_move_cursor_down(view, s->commits->ncommits);
4037 		s->thread_args.load_all = 0;
4038 		break;
4039 	}
4040 	case CTRL('d'):
4041 	case 'd':
4042 		nscroll /= 2;
4043 		/* FALL THROUGH */
4044 	case KEY_NPAGE:
4045 	case CTRL('f'):
4046 	case 'f':
4047 	case ' ':
4048 		err = log_move_cursor_down(view, nscroll);
4049 		break;
4050 	case KEY_RESIZE:
4051 		if (s->selected > view->nlines - 2)
4052 			s->selected = view->nlines - 2;
4053 		if (s->selected > s->commits->ncommits - 1)
4054 			s->selected = s->commits->ncommits - 1;
4055 		select_commit(s);
4056 		if (s->commits->ncommits < view->nlines - 1 &&
4057 		    !s->thread_args.log_complete) {
4058 			s->thread_args.commits_needed += (view->nlines - 1) -
4059 			    s->commits->ncommits;
4060 			err = trigger_log_thread(view, 1);
4061 		}
4062 		break;
4063 	case KEY_ENTER:
4064 	case '\r':
4065 		view->count = 0;
4066 		if (s->selected_entry == NULL)
4067 			break;
4068 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4069 		break;
4070 	case 'T':
4071 		view->count = 0;
4072 		if (s->selected_entry == NULL)
4073 			break;
4074 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4075 		break;
4076 	case KEY_BACKSPACE:
4077 	case CTRL('l'):
4078 	case 'B':
4079 		view->count = 0;
4080 		if (ch == KEY_BACKSPACE &&
4081 		    got_path_is_root_dir(s->in_repo_path))
4082 			break;
4083 		err = stop_log_thread(s);
4084 		if (err)
4085 			return err;
4086 		if (ch == KEY_BACKSPACE) {
4087 			char *parent_path;
4088 			err = got_path_dirname(&parent_path, s->in_repo_path);
4089 			if (err)
4090 				return err;
4091 			free(s->in_repo_path);
4092 			s->in_repo_path = parent_path;
4093 			s->thread_args.in_repo_path = s->in_repo_path;
4094 		} else if (ch == CTRL('l')) {
4095 			struct got_object_id *start_id;
4096 			err = got_repo_match_object_id(&start_id, NULL,
4097 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4098 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4099 			if (err) {
4100 				if (s->head_ref_name == NULL ||
4101 				    err->code != GOT_ERR_NOT_REF)
4102 					return err;
4103 				/* Try to cope with deleted references. */
4104 				free(s->head_ref_name);
4105 				s->head_ref_name = NULL;
4106 				err = got_repo_match_object_id(&start_id,
4107 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4108 				    &tog_refs, s->repo);
4109 				if (err)
4110 					return err;
4111 			}
4112 			free(s->start_id);
4113 			s->start_id = start_id;
4114 			s->thread_args.start_id = s->start_id;
4115 		} else /* 'B' */
4116 			s->log_branches = !s->log_branches;
4117 
4118 		if (s->thread_args.pack_fds == NULL) {
4119 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4120 			if (err)
4121 				return err;
4122 		}
4123 		err = got_repo_open(&s->thread_args.repo,
4124 		    got_repo_get_path(s->repo), NULL,
4125 		    s->thread_args.pack_fds);
4126 		if (err)
4127 			return err;
4128 		tog_free_refs();
4129 		err = tog_load_refs(s->repo, 0);
4130 		if (err)
4131 			return err;
4132 		err = got_commit_graph_open(&s->thread_args.graph,
4133 		    s->in_repo_path, !s->log_branches);
4134 		if (err)
4135 			return err;
4136 		err = got_commit_graph_iter_start(s->thread_args.graph,
4137 		    s->start_id, s->repo, NULL, NULL);
4138 		if (err)
4139 			return err;
4140 		free_commits(&s->real_commits);
4141 		free_commits(&s->limit_commits);
4142 		s->first_displayed_entry = NULL;
4143 		s->last_displayed_entry = NULL;
4144 		s->selected_entry = NULL;
4145 		s->selected = 0;
4146 		s->thread_args.log_complete = 0;
4147 		s->quit = 0;
4148 		s->thread_args.commits_needed = view->lines;
4149 		s->matched_entry = NULL;
4150 		s->search_entry = NULL;
4151 		view->offset = 0;
4152 		break;
4153 	case 'R':
4154 		view->count = 0;
4155 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4156 		break;
4157 	default:
4158 		view->count = 0;
4159 		break;
4160 	}
4161 
4162 	return err;
4163 }
4164 
4165 static const struct got_error *
4166 apply_unveil(const char *repo_path, const char *worktree_path)
4167 {
4168 	const struct got_error *error;
4169 
4170 #ifdef PROFILE
4171 	if (unveil("gmon.out", "rwc") != 0)
4172 		return got_error_from_errno2("unveil", "gmon.out");
4173 #endif
4174 	if (repo_path && unveil(repo_path, "r") != 0)
4175 		return got_error_from_errno2("unveil", repo_path);
4176 
4177 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4178 		return got_error_from_errno2("unveil", worktree_path);
4179 
4180 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4181 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4182 
4183 	error = got_privsep_unveil_exec_helpers();
4184 	if (error != NULL)
4185 		return error;
4186 
4187 	if (unveil(NULL, NULL) != 0)
4188 		return got_error_from_errno("unveil");
4189 
4190 	return NULL;
4191 }
4192 
4193 static const struct got_error *
4194 init_mock_term(const char *test_script_path)
4195 {
4196 	const struct got_error	*err = NULL;
4197 	const char *screen_dump_path;
4198 	int in;
4199 
4200 	if (test_script_path == NULL || *test_script_path == '\0')
4201 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4202 
4203 	tog_io.f = fopen(test_script_path, "re");
4204 	if (tog_io.f == NULL) {
4205 		err = got_error_from_errno_fmt("fopen: %s",
4206 		    test_script_path);
4207 		goto done;
4208 	}
4209 
4210 	/* test mode, we don't want any output */
4211 	tog_io.cout = fopen("/dev/null", "w+");
4212 	if (tog_io.cout == NULL) {
4213 		err = got_error_from_errno2("fopen", "/dev/null");
4214 		goto done;
4215 	}
4216 
4217 	in = dup(fileno(tog_io.cout));
4218 	if (in == -1) {
4219 		err = got_error_from_errno("dup");
4220 		goto done;
4221 	}
4222 	tog_io.cin = fdopen(in, "r");
4223 	if (tog_io.cin == NULL) {
4224 		err = got_error_from_errno("fdopen");
4225 		close(in);
4226 		goto done;
4227 	}
4228 
4229 	screen_dump_path = getenv("TOG_SCR_DUMP");
4230 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4231 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4232 	tog_io.sdump = fopen(screen_dump_path, "wex");
4233 	if (tog_io.sdump == NULL) {
4234 		err = got_error_from_errno2("fopen", screen_dump_path);
4235 		goto done;
4236 	}
4237 
4238 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4239 		err = got_error_from_errno("fseeko");
4240 		goto done;
4241 	}
4242 
4243 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4244 		err = got_error_msg(GOT_ERR_IO,
4245 		    "newterm: failed to initialise curses");
4246 
4247 	using_mock_io = 1;
4248 
4249 done:
4250 	if (err)
4251 		tog_io_close();
4252 	return err;
4253 }
4254 
4255 static void
4256 init_curses(void)
4257 {
4258 	/*
4259 	 * Override default signal handlers before starting ncurses.
4260 	 * This should prevent ncurses from installing its own
4261 	 * broken cleanup() signal handler.
4262 	 */
4263 	signal(SIGWINCH, tog_sigwinch);
4264 	signal(SIGPIPE, tog_sigpipe);
4265 	signal(SIGCONT, tog_sigcont);
4266 	signal(SIGINT, tog_sigint);
4267 	signal(SIGTERM, tog_sigterm);
4268 
4269 	if (using_mock_io) /* In test mode we use a fake terminal */
4270 		return;
4271 
4272 	initscr();
4273 
4274 	cbreak();
4275 	halfdelay(1); /* Fast refresh while initial view is loading. */
4276 	noecho();
4277 	nonl();
4278 	intrflush(stdscr, FALSE);
4279 	keypad(stdscr, TRUE);
4280 	curs_set(0);
4281 	if (getenv("TOG_COLORS") != NULL) {
4282 		start_color();
4283 		use_default_colors();
4284 	}
4285 
4286 	return;
4287 }
4288 
4289 static const struct got_error *
4290 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4291     struct got_repository *repo, struct got_worktree *worktree)
4292 {
4293 	const struct got_error *err = NULL;
4294 
4295 	if (argc == 0) {
4296 		*in_repo_path = strdup("/");
4297 		if (*in_repo_path == NULL)
4298 			return got_error_from_errno("strdup");
4299 		return NULL;
4300 	}
4301 
4302 	if (worktree) {
4303 		const char *prefix = got_worktree_get_path_prefix(worktree);
4304 		char *p;
4305 
4306 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4307 		if (err)
4308 			return err;
4309 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4310 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4311 		    p) == -1) {
4312 			err = got_error_from_errno("asprintf");
4313 			*in_repo_path = NULL;
4314 		}
4315 		free(p);
4316 	} else
4317 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4318 
4319 	return err;
4320 }
4321 
4322 static const struct got_error *
4323 cmd_log(int argc, char *argv[])
4324 {
4325 	const struct got_error *error;
4326 	struct got_repository *repo = NULL;
4327 	struct got_worktree *worktree = NULL;
4328 	struct got_object_id *start_id = NULL;
4329 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4330 	char *start_commit = NULL, *label = NULL;
4331 	struct got_reference *ref = NULL;
4332 	const char *head_ref_name = NULL;
4333 	int ch, log_branches = 0;
4334 	struct tog_view *view;
4335 	int *pack_fds = NULL;
4336 
4337 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4338 		switch (ch) {
4339 		case 'b':
4340 			log_branches = 1;
4341 			break;
4342 		case 'c':
4343 			start_commit = optarg;
4344 			break;
4345 		case 'r':
4346 			repo_path = realpath(optarg, NULL);
4347 			if (repo_path == NULL)
4348 				return got_error_from_errno2("realpath",
4349 				    optarg);
4350 			break;
4351 		default:
4352 			usage_log();
4353 			/* NOTREACHED */
4354 		}
4355 	}
4356 
4357 	argc -= optind;
4358 	argv += optind;
4359 
4360 	if (argc > 1)
4361 		usage_log();
4362 
4363 	error = got_repo_pack_fds_open(&pack_fds);
4364 	if (error != NULL)
4365 		goto done;
4366 
4367 	if (repo_path == NULL) {
4368 		cwd = getcwd(NULL, 0);
4369 		if (cwd == NULL)
4370 			return got_error_from_errno("getcwd");
4371 		error = got_worktree_open(&worktree, cwd);
4372 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4373 			goto done;
4374 		if (worktree)
4375 			repo_path =
4376 			    strdup(got_worktree_get_repo_path(worktree));
4377 		else
4378 			repo_path = strdup(cwd);
4379 		if (repo_path == NULL) {
4380 			error = got_error_from_errno("strdup");
4381 			goto done;
4382 		}
4383 	}
4384 
4385 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4386 	if (error != NULL)
4387 		goto done;
4388 
4389 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4390 	    repo, worktree);
4391 	if (error)
4392 		goto done;
4393 
4394 	init_curses();
4395 
4396 	error = apply_unveil(got_repo_get_path(repo),
4397 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4398 	if (error)
4399 		goto done;
4400 
4401 	/* already loaded by tog_log_with_path()? */
4402 	if (TAILQ_EMPTY(&tog_refs)) {
4403 		error = tog_load_refs(repo, 0);
4404 		if (error)
4405 			goto done;
4406 	}
4407 
4408 	if (start_commit == NULL) {
4409 		error = got_repo_match_object_id(&start_id, &label,
4410 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4411 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4412 		if (error)
4413 			goto done;
4414 		head_ref_name = label;
4415 	} else {
4416 		error = got_ref_open(&ref, repo, start_commit, 0);
4417 		if (error == NULL)
4418 			head_ref_name = got_ref_get_name(ref);
4419 		else if (error->code != GOT_ERR_NOT_REF)
4420 			goto done;
4421 		error = got_repo_match_object_id(&start_id, NULL,
4422 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4423 		if (error)
4424 			goto done;
4425 	}
4426 
4427 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4428 	if (view == NULL) {
4429 		error = got_error_from_errno("view_open");
4430 		goto done;
4431 	}
4432 	error = open_log_view(view, start_id, repo, head_ref_name,
4433 	    in_repo_path, log_branches);
4434 	if (error)
4435 		goto done;
4436 	if (worktree) {
4437 		/* Release work tree lock. */
4438 		got_worktree_close(worktree);
4439 		worktree = NULL;
4440 	}
4441 	error = view_loop(view);
4442 done:
4443 	free(in_repo_path);
4444 	free(repo_path);
4445 	free(cwd);
4446 	free(start_id);
4447 	free(label);
4448 	if (ref)
4449 		got_ref_close(ref);
4450 	if (repo) {
4451 		const struct got_error *close_err = got_repo_close(repo);
4452 		if (error == NULL)
4453 			error = close_err;
4454 	}
4455 	if (worktree)
4456 		got_worktree_close(worktree);
4457 	if (pack_fds) {
4458 		const struct got_error *pack_err =
4459 		    got_repo_pack_fds_close(pack_fds);
4460 		if (error == NULL)
4461 			error = pack_err;
4462 	}
4463 	tog_free_refs();
4464 	return error;
4465 }
4466 
4467 __dead static void
4468 usage_diff(void)
4469 {
4470 	endwin();
4471 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4472 	    "object1 object2\n", getprogname());
4473 	exit(1);
4474 }
4475 
4476 static int
4477 match_line(const char *line, regex_t *regex, size_t nmatch,
4478     regmatch_t *regmatch)
4479 {
4480 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4481 }
4482 
4483 static struct tog_color *
4484 match_color(struct tog_colors *colors, const char *line)
4485 {
4486 	struct tog_color *tc = NULL;
4487 
4488 	STAILQ_FOREACH(tc, colors, entry) {
4489 		if (match_line(line, &tc->regex, 0, NULL))
4490 			return tc;
4491 	}
4492 
4493 	return NULL;
4494 }
4495 
4496 static const struct got_error *
4497 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4498     WINDOW *window, int skipcol, regmatch_t *regmatch)
4499 {
4500 	const struct got_error *err = NULL;
4501 	char *exstr = NULL;
4502 	wchar_t *wline = NULL;
4503 	int rme, rms, n, width, scrollx;
4504 	int width0 = 0, width1 = 0, width2 = 0;
4505 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4506 
4507 	*wtotal = 0;
4508 
4509 	rms = regmatch->rm_so;
4510 	rme = regmatch->rm_eo;
4511 
4512 	err = expand_tab(&exstr, line);
4513 	if (err)
4514 		return err;
4515 
4516 	/* Split the line into 3 segments, according to match offsets. */
4517 	seg0 = strndup(exstr, rms);
4518 	if (seg0 == NULL) {
4519 		err = got_error_from_errno("strndup");
4520 		goto done;
4521 	}
4522 	seg1 = strndup(exstr + rms, rme - rms);
4523 	if (seg1 == NULL) {
4524 		err = got_error_from_errno("strndup");
4525 		goto done;
4526 	}
4527 	seg2 = strdup(exstr + rme);
4528 	if (seg2 == NULL) {
4529 		err = got_error_from_errno("strndup");
4530 		goto done;
4531 	}
4532 
4533 	/* draw up to matched token if we haven't scrolled past it */
4534 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4535 	    col_tab_align, 1);
4536 	if (err)
4537 		goto done;
4538 	n = MAX(width0 - skipcol, 0);
4539 	if (n) {
4540 		free(wline);
4541 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4542 		    wlimit, col_tab_align, 1);
4543 		if (err)
4544 			goto done;
4545 		waddwstr(window, &wline[scrollx]);
4546 		wlimit -= width;
4547 		*wtotal += width;
4548 	}
4549 
4550 	if (wlimit > 0) {
4551 		int i = 0, w = 0;
4552 		size_t wlen;
4553 
4554 		free(wline);
4555 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4556 		    col_tab_align, 1);
4557 		if (err)
4558 			goto done;
4559 		wlen = wcslen(wline);
4560 		while (i < wlen) {
4561 			width = wcwidth(wline[i]);
4562 			if (width == -1) {
4563 				/* should not happen, tabs are expanded */
4564 				err = got_error(GOT_ERR_RANGE);
4565 				goto done;
4566 			}
4567 			if (width0 + w + width > skipcol)
4568 				break;
4569 			w += width;
4570 			i++;
4571 		}
4572 		/* draw (visible part of) matched token (if scrolled into it) */
4573 		if (width1 - w > 0) {
4574 			wattron(window, A_STANDOUT);
4575 			waddwstr(window, &wline[i]);
4576 			wattroff(window, A_STANDOUT);
4577 			wlimit -= (width1 - w);
4578 			*wtotal += (width1 - w);
4579 		}
4580 	}
4581 
4582 	if (wlimit > 0) {  /* draw rest of line */
4583 		free(wline);
4584 		if (skipcol > width0 + width1) {
4585 			err = format_line(&wline, &width2, &scrollx, seg2,
4586 			    skipcol - (width0 + width1), wlimit,
4587 			    col_tab_align, 1);
4588 			if (err)
4589 				goto done;
4590 			waddwstr(window, &wline[scrollx]);
4591 		} else {
4592 			err = format_line(&wline, &width2, NULL, seg2, 0,
4593 			    wlimit, col_tab_align, 1);
4594 			if (err)
4595 				goto done;
4596 			waddwstr(window, wline);
4597 		}
4598 		*wtotal += width2;
4599 	}
4600 done:
4601 	free(wline);
4602 	free(exstr);
4603 	free(seg0);
4604 	free(seg1);
4605 	free(seg2);
4606 	return err;
4607 }
4608 
4609 static int
4610 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4611 {
4612 	FILE	*f = NULL;
4613 	int	*eof, *first, *selected;
4614 
4615 	if (view->type == TOG_VIEW_DIFF) {
4616 		struct tog_diff_view_state *s = &view->state.diff;
4617 
4618 		first = &s->first_displayed_line;
4619 		selected = first;
4620 		eof = &s->eof;
4621 		f = s->f;
4622 	} else if (view->type == TOG_VIEW_HELP) {
4623 		struct tog_help_view_state *s = &view->state.help;
4624 
4625 		first = &s->first_displayed_line;
4626 		selected = first;
4627 		eof = &s->eof;
4628 		f = s->f;
4629 	} else if (view->type == TOG_VIEW_BLAME) {
4630 		struct tog_blame_view_state *s = &view->state.blame;
4631 
4632 		first = &s->first_displayed_line;
4633 		selected = &s->selected_line;
4634 		eof = &s->eof;
4635 		f = s->blame.f;
4636 	} else
4637 		return 0;
4638 
4639 	/* Center gline in the middle of the page like vi(1). */
4640 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4641 		return 0;
4642 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4643 		rewind(f);
4644 		*eof = 0;
4645 		*first = 1;
4646 		*lineno = 0;
4647 		*nprinted = 0;
4648 		return 0;
4649 	}
4650 
4651 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4652 		view->gline : (view->nlines - 3) / 2 + 1;
4653 	view->gline = 0;
4654 
4655 	return 1;
4656 }
4657 
4658 static const struct got_error *
4659 draw_file(struct tog_view *view, const char *header)
4660 {
4661 	struct tog_diff_view_state *s = &view->state.diff;
4662 	regmatch_t *regmatch = &view->regmatch;
4663 	const struct got_error *err;
4664 	int nprinted = 0;
4665 	char *line;
4666 	size_t linesize = 0;
4667 	ssize_t linelen;
4668 	wchar_t *wline;
4669 	int width;
4670 	int max_lines = view->nlines;
4671 	int nlines = s->nlines;
4672 	off_t line_offset;
4673 
4674 	s->lineno = s->first_displayed_line - 1;
4675 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4676 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4677 		return got_error_from_errno("fseek");
4678 
4679 	werase(view->window);
4680 
4681 	if (view->gline > s->nlines - 1)
4682 		view->gline = s->nlines - 1;
4683 
4684 	if (header) {
4685 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4686 		    1 : view->gline - (view->nlines - 3) / 2 :
4687 		    s->lineno + s->selected_line;
4688 
4689 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4690 			return got_error_from_errno("asprintf");
4691 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4692 		    0, 0);
4693 		free(line);
4694 		if (err)
4695 			return err;
4696 
4697 		if (view_needs_focus_indication(view))
4698 			wstandout(view->window);
4699 		waddwstr(view->window, wline);
4700 		free(wline);
4701 		wline = NULL;
4702 		while (width++ < view->ncols)
4703 			waddch(view->window, ' ');
4704 		if (view_needs_focus_indication(view))
4705 			wstandend(view->window);
4706 
4707 		if (max_lines <= 1)
4708 			return NULL;
4709 		max_lines--;
4710 	}
4711 
4712 	s->eof = 0;
4713 	view->maxx = 0;
4714 	line = NULL;
4715 	while (max_lines > 0 && nprinted < max_lines) {
4716 		enum got_diff_line_type linetype;
4717 		attr_t attr = 0;
4718 
4719 		linelen = getline(&line, &linesize, s->f);
4720 		if (linelen == -1) {
4721 			if (feof(s->f)) {
4722 				s->eof = 1;
4723 				break;
4724 			}
4725 			free(line);
4726 			return got_ferror(s->f, GOT_ERR_IO);
4727 		}
4728 
4729 		if (++s->lineno < s->first_displayed_line)
4730 			continue;
4731 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4732 			continue;
4733 		if (s->lineno == view->hiline)
4734 			attr = A_STANDOUT;
4735 
4736 		/* Set view->maxx based on full line length. */
4737 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4738 		    view->x ? 1 : 0);
4739 		if (err) {
4740 			free(line);
4741 			return err;
4742 		}
4743 		view->maxx = MAX(view->maxx, width);
4744 		free(wline);
4745 		wline = NULL;
4746 
4747 		linetype = s->lines[s->lineno].type;
4748 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4749 		    linetype < GOT_DIFF_LINE_CONTEXT)
4750 			attr |= COLOR_PAIR(linetype);
4751 		if (attr)
4752 			wattron(view->window, attr);
4753 		if (s->first_displayed_line + nprinted == s->matched_line &&
4754 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4755 			err = add_matched_line(&width, line, view->ncols, 0,
4756 			    view->window, view->x, regmatch);
4757 			if (err) {
4758 				free(line);
4759 				return err;
4760 			}
4761 		} else {
4762 			int skip;
4763 			err = format_line(&wline, &width, &skip, line,
4764 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4765 			if (err) {
4766 				free(line);
4767 				return err;
4768 			}
4769 			waddwstr(view->window, &wline[skip]);
4770 			free(wline);
4771 			wline = NULL;
4772 		}
4773 		if (s->lineno == view->hiline) {
4774 			/* highlight full gline length */
4775 			while (width++ < view->ncols)
4776 				waddch(view->window, ' ');
4777 		} else {
4778 			if (width <= view->ncols - 1)
4779 				waddch(view->window, '\n');
4780 		}
4781 		if (attr)
4782 			wattroff(view->window, attr);
4783 		if (++nprinted == 1)
4784 			s->first_displayed_line = s->lineno;
4785 	}
4786 	free(line);
4787 	if (nprinted >= 1)
4788 		s->last_displayed_line = s->first_displayed_line +
4789 		    (nprinted - 1);
4790 	else
4791 		s->last_displayed_line = s->first_displayed_line;
4792 
4793 	view_border(view);
4794 
4795 	if (s->eof) {
4796 		while (nprinted < view->nlines) {
4797 			waddch(view->window, '\n');
4798 			nprinted++;
4799 		}
4800 
4801 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4802 		    view->ncols, 0, 0);
4803 		if (err) {
4804 			return err;
4805 		}
4806 
4807 		wstandout(view->window);
4808 		waddwstr(view->window, wline);
4809 		free(wline);
4810 		wline = NULL;
4811 		wstandend(view->window);
4812 	}
4813 
4814 	return NULL;
4815 }
4816 
4817 static char *
4818 get_datestr(time_t *time, char *datebuf)
4819 {
4820 	struct tm mytm, *tm;
4821 	char *p, *s;
4822 
4823 	tm = gmtime_r(time, &mytm);
4824 	if (tm == NULL)
4825 		return NULL;
4826 	s = asctime_r(tm, datebuf);
4827 	if (s == NULL)
4828 		return NULL;
4829 	p = strchr(s, '\n');
4830 	if (p)
4831 		*p = '\0';
4832 	return s;
4833 }
4834 
4835 static const struct got_error *
4836 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4837     off_t off, uint8_t type)
4838 {
4839 	struct got_diff_line *p;
4840 
4841 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4842 	if (p == NULL)
4843 		return got_error_from_errno("reallocarray");
4844 	*lines = p;
4845 	(*lines)[*nlines].offset = off;
4846 	(*lines)[*nlines].type = type;
4847 	(*nlines)++;
4848 
4849 	return NULL;
4850 }
4851 
4852 static const struct got_error *
4853 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4854     struct got_diff_line *s_lines, size_t s_nlines)
4855 {
4856 	struct got_diff_line	*p;
4857 	char			 buf[BUFSIZ];
4858 	size_t			 i, r;
4859 
4860 	if (fseeko(src, 0L, SEEK_SET) == -1)
4861 		return got_error_from_errno("fseeko");
4862 
4863 	for (;;) {
4864 		r = fread(buf, 1, sizeof(buf), src);
4865 		if (r == 0) {
4866 			if (ferror(src))
4867 				return got_error_from_errno("fread");
4868 			if (feof(src))
4869 				break;
4870 		}
4871 		if (fwrite(buf, 1, r, dst) != r)
4872 			return got_ferror(dst, GOT_ERR_IO);
4873 	}
4874 
4875 	if (s_nlines == 0 && *d_nlines == 0)
4876 		return NULL;
4877 
4878 	/*
4879 	 * If commit info was in dst, increment line offsets
4880 	 * of the appended diff content, but skip s_lines[0]
4881 	 * because offset zero is already in *d_lines.
4882 	 */
4883 	if (*d_nlines > 0) {
4884 		for (i = 1; i < s_nlines; ++i)
4885 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4886 
4887 		if (s_nlines > 0) {
4888 			--s_nlines;
4889 			++s_lines;
4890 		}
4891 	}
4892 
4893 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4894 	if (p == NULL) {
4895 		/* d_lines is freed in close_diff_view() */
4896 		return got_error_from_errno("reallocarray");
4897 	}
4898 
4899 	*d_lines = p;
4900 
4901 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4902 	*d_nlines += s_nlines;
4903 
4904 	return NULL;
4905 }
4906 
4907 static const struct got_error *
4908 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4909     struct got_object_id *commit_id, struct got_reflist_head *refs,
4910     struct got_repository *repo, int ignore_ws, int force_text_diff,
4911     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4912 {
4913 	const struct got_error *err = NULL;
4914 	char datebuf[26], *datestr;
4915 	struct got_commit_object *commit;
4916 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4917 	time_t committer_time;
4918 	const char *author, *committer;
4919 	char *refs_str = NULL;
4920 	struct got_pathlist_entry *pe;
4921 	off_t outoff = 0;
4922 	int n;
4923 
4924 	if (refs) {
4925 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4926 		if (err)
4927 			return err;
4928 	}
4929 
4930 	err = got_object_open_as_commit(&commit, repo, commit_id);
4931 	if (err)
4932 		return err;
4933 
4934 	err = got_object_id_str(&id_str, commit_id);
4935 	if (err) {
4936 		err = got_error_from_errno("got_object_id_str");
4937 		goto done;
4938 	}
4939 
4940 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4941 	if (err)
4942 		goto done;
4943 
4944 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4945 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4946 	if (n < 0) {
4947 		err = got_error_from_errno("fprintf");
4948 		goto done;
4949 	}
4950 	outoff += n;
4951 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4952 	if (err)
4953 		goto done;
4954 
4955 	n = fprintf(outfile, "from: %s\n",
4956 	    got_object_commit_get_author(commit));
4957 	if (n < 0) {
4958 		err = got_error_from_errno("fprintf");
4959 		goto done;
4960 	}
4961 	outoff += n;
4962 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4963 	if (err)
4964 		goto done;
4965 
4966 	author = got_object_commit_get_author(commit);
4967 	committer = got_object_commit_get_committer(commit);
4968 	if (strcmp(author, committer) != 0) {
4969 		n = fprintf(outfile, "via: %s\n", committer);
4970 		if (n < 0) {
4971 			err = got_error_from_errno("fprintf");
4972 			goto done;
4973 		}
4974 		outoff += n;
4975 		err = add_line_metadata(lines, nlines, outoff,
4976 		    GOT_DIFF_LINE_AUTHOR);
4977 		if (err)
4978 			goto done;
4979 	}
4980 	committer_time = got_object_commit_get_committer_time(commit);
4981 	datestr = get_datestr(&committer_time, datebuf);
4982 	if (datestr) {
4983 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4984 		if (n < 0) {
4985 			err = got_error_from_errno("fprintf");
4986 			goto done;
4987 		}
4988 		outoff += n;
4989 		err = add_line_metadata(lines, nlines, outoff,
4990 		    GOT_DIFF_LINE_DATE);
4991 		if (err)
4992 			goto done;
4993 	}
4994 	if (got_object_commit_get_nparents(commit) > 1) {
4995 		const struct got_object_id_queue *parent_ids;
4996 		struct got_object_qid *qid;
4997 		int pn = 1;
4998 		parent_ids = got_object_commit_get_parent_ids(commit);
4999 		STAILQ_FOREACH(qid, parent_ids, entry) {
5000 			err = got_object_id_str(&id_str, &qid->id);
5001 			if (err)
5002 				goto done;
5003 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5004 			if (n < 0) {
5005 				err = got_error_from_errno("fprintf");
5006 				goto done;
5007 			}
5008 			outoff += n;
5009 			err = add_line_metadata(lines, nlines, outoff,
5010 			    GOT_DIFF_LINE_META);
5011 			if (err)
5012 				goto done;
5013 			free(id_str);
5014 			id_str = NULL;
5015 		}
5016 	}
5017 
5018 	err = got_object_commit_get_logmsg(&logmsg, commit);
5019 	if (err)
5020 		goto done;
5021 	s = logmsg;
5022 	while ((line = strsep(&s, "\n")) != NULL) {
5023 		n = fprintf(outfile, "%s\n", line);
5024 		if (n < 0) {
5025 			err = got_error_from_errno("fprintf");
5026 			goto done;
5027 		}
5028 		outoff += n;
5029 		err = add_line_metadata(lines, nlines, outoff,
5030 		    GOT_DIFF_LINE_LOGMSG);
5031 		if (err)
5032 			goto done;
5033 	}
5034 
5035 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5036 		struct got_diff_changed_path *cp = pe->data;
5037 		int pad = dsa->max_path_len - pe->path_len + 1;
5038 
5039 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5040 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5041 		    dsa->rm_cols + 1, cp->rm);
5042 		if (n < 0) {
5043 			err = got_error_from_errno("fprintf");
5044 			goto done;
5045 		}
5046 		outoff += n;
5047 		err = add_line_metadata(lines, nlines, outoff,
5048 		    GOT_DIFF_LINE_CHANGES);
5049 		if (err)
5050 			goto done;
5051 	}
5052 
5053 	fputc('\n', outfile);
5054 	outoff++;
5055 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5056 	if (err)
5057 		goto done;
5058 
5059 	n = fprintf(outfile,
5060 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5061 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5062 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5063 	if (n < 0) {
5064 		err = got_error_from_errno("fprintf");
5065 		goto done;
5066 	}
5067 	outoff += n;
5068 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5069 	if (err)
5070 		goto done;
5071 
5072 	fputc('\n', outfile);
5073 	outoff++;
5074 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5075 done:
5076 	free(id_str);
5077 	free(logmsg);
5078 	free(refs_str);
5079 	got_object_commit_close(commit);
5080 	if (err) {
5081 		free(*lines);
5082 		*lines = NULL;
5083 		*nlines = 0;
5084 	}
5085 	return err;
5086 }
5087 
5088 static const struct got_error *
5089 create_diff(struct tog_diff_view_state *s)
5090 {
5091 	const struct got_error *err = NULL;
5092 	FILE *f = NULL, *tmp_diff_file = NULL;
5093 	int obj_type;
5094 	struct got_diff_line *lines = NULL;
5095 	struct got_pathlist_head changed_paths;
5096 
5097 	TAILQ_INIT(&changed_paths);
5098 
5099 	free(s->lines);
5100 	s->lines = malloc(sizeof(*s->lines));
5101 	if (s->lines == NULL)
5102 		return got_error_from_errno("malloc");
5103 	s->nlines = 0;
5104 
5105 	f = got_opentemp();
5106 	if (f == NULL) {
5107 		err = got_error_from_errno("got_opentemp");
5108 		goto done;
5109 	}
5110 	tmp_diff_file = got_opentemp();
5111 	if (tmp_diff_file == NULL) {
5112 		err = got_error_from_errno("got_opentemp");
5113 		goto done;
5114 	}
5115 	if (s->f && fclose(s->f) == EOF) {
5116 		err = got_error_from_errno("fclose");
5117 		goto done;
5118 	}
5119 	s->f = f;
5120 
5121 	if (s->id1)
5122 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5123 	else
5124 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5125 	if (err)
5126 		goto done;
5127 
5128 	switch (obj_type) {
5129 	case GOT_OBJ_TYPE_BLOB:
5130 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5131 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5132 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5133 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5134 		    s->f);
5135 		break;
5136 	case GOT_OBJ_TYPE_TREE:
5137 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5138 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5139 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5140 		    s->force_text_diff, NULL, s->repo, s->f);
5141 		break;
5142 	case GOT_OBJ_TYPE_COMMIT: {
5143 		const struct got_object_id_queue *parent_ids;
5144 		struct got_object_qid *pid;
5145 		struct got_commit_object *commit2;
5146 		struct got_reflist_head *refs;
5147 		size_t nlines = 0;
5148 		struct got_diffstat_cb_arg dsa = {
5149 			0, 0, 0, 0, 0, 0,
5150 			&changed_paths,
5151 			s->ignore_whitespace,
5152 			s->force_text_diff,
5153 			tog_diff_algo
5154 		};
5155 
5156 		lines = malloc(sizeof(*lines));
5157 		if (lines == NULL) {
5158 			err = got_error_from_errno("malloc");
5159 			goto done;
5160 		}
5161 
5162 		/* build diff first in tmp file then append to commit info */
5163 		err = got_diff_objects_as_commits(&lines, &nlines,
5164 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5165 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5166 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5167 		if (err)
5168 			break;
5169 
5170 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5171 		if (err)
5172 			goto done;
5173 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5174 		/* Show commit info if we're diffing to a parent/root commit. */
5175 		if (s->id1 == NULL) {
5176 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5177 			    refs, s->repo, s->ignore_whitespace,
5178 			    s->force_text_diff, &dsa, s->f);
5179 			if (err)
5180 				goto done;
5181 		} else {
5182 			parent_ids = got_object_commit_get_parent_ids(commit2);
5183 			STAILQ_FOREACH(pid, parent_ids, entry) {
5184 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5185 					err = write_commit_info(&s->lines,
5186 					    &s->nlines, s->id2, refs, s->repo,
5187 					    s->ignore_whitespace,
5188 					    s->force_text_diff, &dsa, s->f);
5189 					if (err)
5190 						goto done;
5191 					break;
5192 				}
5193 			}
5194 		}
5195 		got_object_commit_close(commit2);
5196 
5197 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5198 		    lines, nlines);
5199 		break;
5200 	}
5201 	default:
5202 		err = got_error(GOT_ERR_OBJ_TYPE);
5203 		break;
5204 	}
5205 done:
5206 	free(lines);
5207 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5208 	if (s->f && fflush(s->f) != 0 && err == NULL)
5209 		err = got_error_from_errno("fflush");
5210 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5211 		err = got_error_from_errno("fclose");
5212 	return err;
5213 }
5214 
5215 static void
5216 diff_view_indicate_progress(struct tog_view *view)
5217 {
5218 	mvwaddstr(view->window, 0, 0, "diffing...");
5219 	update_panels();
5220 	doupdate();
5221 }
5222 
5223 static const struct got_error *
5224 search_start_diff_view(struct tog_view *view)
5225 {
5226 	struct tog_diff_view_state *s = &view->state.diff;
5227 
5228 	s->matched_line = 0;
5229 	return NULL;
5230 }
5231 
5232 static void
5233 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5234     size_t *nlines, int **first, int **last, int **match, int **selected)
5235 {
5236 	struct tog_diff_view_state *s = &view->state.diff;
5237 
5238 	*f = s->f;
5239 	*nlines = s->nlines;
5240 	*line_offsets = NULL;
5241 	*match = &s->matched_line;
5242 	*first = &s->first_displayed_line;
5243 	*last = &s->last_displayed_line;
5244 	*selected = &s->selected_line;
5245 }
5246 
5247 static const struct got_error *
5248 search_next_view_match(struct tog_view *view)
5249 {
5250 	const struct got_error *err = NULL;
5251 	FILE *f;
5252 	int lineno;
5253 	char *line = NULL;
5254 	size_t linesize = 0;
5255 	ssize_t linelen;
5256 	off_t *line_offsets;
5257 	size_t nlines = 0;
5258 	int *first, *last, *match, *selected;
5259 
5260 	if (!view->search_setup)
5261 		return got_error_msg(GOT_ERR_NOT_IMPL,
5262 		    "view search not supported");
5263 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5264 	    &match, &selected);
5265 
5266 	if (!view->searching) {
5267 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5268 		return NULL;
5269 	}
5270 
5271 	if (*match) {
5272 		if (view->searching == TOG_SEARCH_FORWARD)
5273 			lineno = *first + 1;
5274 		else
5275 			lineno = *first - 1;
5276 	} else
5277 		lineno = *first - 1 + *selected;
5278 
5279 	while (1) {
5280 		off_t offset;
5281 
5282 		if (lineno <= 0 || lineno > nlines) {
5283 			if (*match == 0) {
5284 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5285 				break;
5286 			}
5287 
5288 			if (view->searching == TOG_SEARCH_FORWARD)
5289 				lineno = 1;
5290 			else
5291 				lineno = nlines;
5292 		}
5293 
5294 		offset = view->type == TOG_VIEW_DIFF ?
5295 		    view->state.diff.lines[lineno - 1].offset :
5296 		    line_offsets[lineno - 1];
5297 		if (fseeko(f, offset, SEEK_SET) != 0) {
5298 			free(line);
5299 			return got_error_from_errno("fseeko");
5300 		}
5301 		linelen = getline(&line, &linesize, f);
5302 		if (linelen != -1) {
5303 			char *exstr;
5304 			err = expand_tab(&exstr, line);
5305 			if (err)
5306 				break;
5307 			if (match_line(exstr, &view->regex, 1,
5308 			    &view->regmatch)) {
5309 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5310 				*match = lineno;
5311 				free(exstr);
5312 				break;
5313 			}
5314 			free(exstr);
5315 		}
5316 		if (view->searching == TOG_SEARCH_FORWARD)
5317 			lineno++;
5318 		else
5319 			lineno--;
5320 	}
5321 	free(line);
5322 
5323 	if (*match) {
5324 		*first = *match;
5325 		*selected = 1;
5326 	}
5327 
5328 	return err;
5329 }
5330 
5331 static const struct got_error *
5332 close_diff_view(struct tog_view *view)
5333 {
5334 	const struct got_error *err = NULL;
5335 	struct tog_diff_view_state *s = &view->state.diff;
5336 
5337 	free(s->id1);
5338 	s->id1 = NULL;
5339 	free(s->id2);
5340 	s->id2 = NULL;
5341 	if (s->f && fclose(s->f) == EOF)
5342 		err = got_error_from_errno("fclose");
5343 	s->f = NULL;
5344 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5345 		err = got_error_from_errno("fclose");
5346 	s->f1 = NULL;
5347 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5348 		err = got_error_from_errno("fclose");
5349 	s->f2 = NULL;
5350 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5351 		err = got_error_from_errno("close");
5352 	s->fd1 = -1;
5353 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5354 		err = got_error_from_errno("close");
5355 	s->fd2 = -1;
5356 	free(s->lines);
5357 	s->lines = NULL;
5358 	s->nlines = 0;
5359 	return err;
5360 }
5361 
5362 static const struct got_error *
5363 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5364     struct got_object_id *id2, const char *label1, const char *label2,
5365     int diff_context, int ignore_whitespace, int force_text_diff,
5366     struct tog_view *parent_view, struct got_repository *repo)
5367 {
5368 	const struct got_error *err;
5369 	struct tog_diff_view_state *s = &view->state.diff;
5370 
5371 	memset(s, 0, sizeof(*s));
5372 	s->fd1 = -1;
5373 	s->fd2 = -1;
5374 
5375 	if (id1 != NULL && id2 != NULL) {
5376 		int type1, type2;
5377 
5378 		err = got_object_get_type(&type1, repo, id1);
5379 		if (err)
5380 			goto done;
5381 		err = got_object_get_type(&type2, repo, id2);
5382 		if (err)
5383 			goto done;
5384 
5385 		if (type1 != type2) {
5386 			err = got_error(GOT_ERR_OBJ_TYPE);
5387 			goto done;
5388 		}
5389 	}
5390 	s->first_displayed_line = 1;
5391 	s->last_displayed_line = view->nlines;
5392 	s->selected_line = 1;
5393 	s->repo = repo;
5394 	s->id1 = id1;
5395 	s->id2 = id2;
5396 	s->label1 = label1;
5397 	s->label2 = label2;
5398 
5399 	if (id1) {
5400 		s->id1 = got_object_id_dup(id1);
5401 		if (s->id1 == NULL) {
5402 			err = got_error_from_errno("got_object_id_dup");
5403 			goto done;
5404 		}
5405 	} else
5406 		s->id1 = NULL;
5407 
5408 	s->id2 = got_object_id_dup(id2);
5409 	if (s->id2 == NULL) {
5410 		err = got_error_from_errno("got_object_id_dup");
5411 		goto done;
5412 	}
5413 
5414 	s->f1 = got_opentemp();
5415 	if (s->f1 == NULL) {
5416 		err = got_error_from_errno("got_opentemp");
5417 		goto done;
5418 	}
5419 
5420 	s->f2 = got_opentemp();
5421 	if (s->f2 == NULL) {
5422 		err = got_error_from_errno("got_opentemp");
5423 		goto done;
5424 	}
5425 
5426 	s->fd1 = got_opentempfd();
5427 	if (s->fd1 == -1) {
5428 		err = got_error_from_errno("got_opentempfd");
5429 		goto done;
5430 	}
5431 
5432 	s->fd2 = got_opentempfd();
5433 	if (s->fd2 == -1) {
5434 		err = got_error_from_errno("got_opentempfd");
5435 		goto done;
5436 	}
5437 
5438 	s->diff_context = diff_context;
5439 	s->ignore_whitespace = ignore_whitespace;
5440 	s->force_text_diff = force_text_diff;
5441 	s->parent_view = parent_view;
5442 	s->repo = repo;
5443 
5444 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5445 		int rc;
5446 
5447 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5448 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5449 		if (rc != ERR)
5450 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5451 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5452 		if (rc != ERR)
5453 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5454 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5455 		if (rc != ERR)
5456 			rc = init_pair(GOT_DIFF_LINE_META,
5457 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5458 		if (rc != ERR)
5459 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5460 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5461 		if (rc != ERR)
5462 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5463 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5464 		if (rc != ERR)
5465 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5466 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5467 		if (rc != ERR)
5468 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5469 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5470 		if (rc != ERR)
5471 			rc = init_pair(GOT_DIFF_LINE_DATE,
5472 			    get_color_value("TOG_COLOR_DATE"), -1);
5473 		if (rc == ERR) {
5474 			err = got_error(GOT_ERR_RANGE);
5475 			goto done;
5476 		}
5477 	}
5478 
5479 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5480 	    view_is_splitscreen(view))
5481 		show_log_view(parent_view); /* draw border */
5482 	diff_view_indicate_progress(view);
5483 
5484 	err = create_diff(s);
5485 
5486 	view->show = show_diff_view;
5487 	view->input = input_diff_view;
5488 	view->reset = reset_diff_view;
5489 	view->close = close_diff_view;
5490 	view->search_start = search_start_diff_view;
5491 	view->search_setup = search_setup_diff_view;
5492 	view->search_next = search_next_view_match;
5493 done:
5494 	if (err) {
5495 		if (view->close == NULL)
5496 			close_diff_view(view);
5497 		view_close(view);
5498 	}
5499 	return err;
5500 }
5501 
5502 static const struct got_error *
5503 show_diff_view(struct tog_view *view)
5504 {
5505 	const struct got_error *err;
5506 	struct tog_diff_view_state *s = &view->state.diff;
5507 	char *id_str1 = NULL, *id_str2, *header;
5508 	const char *label1, *label2;
5509 
5510 	if (s->id1) {
5511 		err = got_object_id_str(&id_str1, s->id1);
5512 		if (err)
5513 			return err;
5514 		label1 = s->label1 ? s->label1 : id_str1;
5515 	} else
5516 		label1 = "/dev/null";
5517 
5518 	err = got_object_id_str(&id_str2, s->id2);
5519 	if (err)
5520 		return err;
5521 	label2 = s->label2 ? s->label2 : id_str2;
5522 
5523 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5524 		err = got_error_from_errno("asprintf");
5525 		free(id_str1);
5526 		free(id_str2);
5527 		return err;
5528 	}
5529 	free(id_str1);
5530 	free(id_str2);
5531 
5532 	err = draw_file(view, header);
5533 	free(header);
5534 	return err;
5535 }
5536 
5537 static const struct got_error *
5538 set_selected_commit(struct tog_diff_view_state *s,
5539     struct commit_queue_entry *entry)
5540 {
5541 	const struct got_error *err;
5542 	const struct got_object_id_queue *parent_ids;
5543 	struct got_commit_object *selected_commit;
5544 	struct got_object_qid *pid;
5545 
5546 	free(s->id2);
5547 	s->id2 = got_object_id_dup(entry->id);
5548 	if (s->id2 == NULL)
5549 		return got_error_from_errno("got_object_id_dup");
5550 
5551 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5552 	if (err)
5553 		return err;
5554 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5555 	free(s->id1);
5556 	pid = STAILQ_FIRST(parent_ids);
5557 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5558 	got_object_commit_close(selected_commit);
5559 	return NULL;
5560 }
5561 
5562 static const struct got_error *
5563 reset_diff_view(struct tog_view *view)
5564 {
5565 	struct tog_diff_view_state *s = &view->state.diff;
5566 
5567 	view->count = 0;
5568 	wclear(view->window);
5569 	s->first_displayed_line = 1;
5570 	s->last_displayed_line = view->nlines;
5571 	s->matched_line = 0;
5572 	diff_view_indicate_progress(view);
5573 	return create_diff(s);
5574 }
5575 
5576 static void
5577 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5578 {
5579 	int start, i;
5580 
5581 	i = start = s->first_displayed_line - 1;
5582 
5583 	while (s->lines[i].type != type) {
5584 		if (i == 0)
5585 			i = s->nlines - 1;
5586 		if (--i == start)
5587 			return; /* do nothing, requested type not in file */
5588 	}
5589 
5590 	s->selected_line = 1;
5591 	s->first_displayed_line = i;
5592 }
5593 
5594 static void
5595 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5596 {
5597 	int start, i;
5598 
5599 	i = start = s->first_displayed_line + 1;
5600 
5601 	while (s->lines[i].type != type) {
5602 		if (i == s->nlines - 1)
5603 			i = 0;
5604 		if (++i == start)
5605 			return; /* do nothing, requested type not in file */
5606 	}
5607 
5608 	s->selected_line = 1;
5609 	s->first_displayed_line = i;
5610 }
5611 
5612 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5613     int, int, int);
5614 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5615     int, int);
5616 
5617 static const struct got_error *
5618 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5619 {
5620 	const struct got_error *err = NULL;
5621 	struct tog_diff_view_state *s = &view->state.diff;
5622 	struct tog_log_view_state *ls;
5623 	struct commit_queue_entry *old_selected_entry;
5624 	char *line = NULL;
5625 	size_t linesize = 0;
5626 	ssize_t linelen;
5627 	int i, nscroll = view->nlines - 1, up = 0;
5628 
5629 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5630 
5631 	switch (ch) {
5632 	case '0':
5633 	case '$':
5634 	case KEY_RIGHT:
5635 	case 'l':
5636 	case KEY_LEFT:
5637 	case 'h':
5638 		horizontal_scroll_input(view, ch);
5639 		break;
5640 	case 'a':
5641 	case 'w':
5642 		if (ch == 'a') {
5643 			s->force_text_diff = !s->force_text_diff;
5644 			view->action = s->force_text_diff ?
5645 			    "force ASCII text enabled" :
5646 			    "force ASCII text disabled";
5647 		}
5648 		else if (ch == 'w') {
5649 			s->ignore_whitespace = !s->ignore_whitespace;
5650 			view->action = s->ignore_whitespace ?
5651 			    "ignore whitespace enabled" :
5652 			    "ignore whitespace disabled";
5653 		}
5654 		err = reset_diff_view(view);
5655 		break;
5656 	case 'g':
5657 	case KEY_HOME:
5658 		s->first_displayed_line = 1;
5659 		view->count = 0;
5660 		break;
5661 	case 'G':
5662 	case KEY_END:
5663 		view->count = 0;
5664 		if (s->eof)
5665 			break;
5666 
5667 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5668 		s->eof = 1;
5669 		break;
5670 	case 'k':
5671 	case KEY_UP:
5672 	case CTRL('p'):
5673 		if (s->first_displayed_line > 1)
5674 			s->first_displayed_line--;
5675 		else
5676 			view->count = 0;
5677 		break;
5678 	case CTRL('u'):
5679 	case 'u':
5680 		nscroll /= 2;
5681 		/* FALL THROUGH */
5682 	case KEY_PPAGE:
5683 	case CTRL('b'):
5684 	case 'b':
5685 		if (s->first_displayed_line == 1) {
5686 			view->count = 0;
5687 			break;
5688 		}
5689 		i = 0;
5690 		while (i++ < nscroll && s->first_displayed_line > 1)
5691 			s->first_displayed_line--;
5692 		break;
5693 	case 'j':
5694 	case KEY_DOWN:
5695 	case CTRL('n'):
5696 		if (!s->eof)
5697 			s->first_displayed_line++;
5698 		else
5699 			view->count = 0;
5700 		break;
5701 	case CTRL('d'):
5702 	case 'd':
5703 		nscroll /= 2;
5704 		/* FALL THROUGH */
5705 	case KEY_NPAGE:
5706 	case CTRL('f'):
5707 	case 'f':
5708 	case ' ':
5709 		if (s->eof) {
5710 			view->count = 0;
5711 			break;
5712 		}
5713 		i = 0;
5714 		while (!s->eof && i++ < nscroll) {
5715 			linelen = getline(&line, &linesize, s->f);
5716 			s->first_displayed_line++;
5717 			if (linelen == -1) {
5718 				if (feof(s->f)) {
5719 					s->eof = 1;
5720 				} else
5721 					err = got_ferror(s->f, GOT_ERR_IO);
5722 				break;
5723 			}
5724 		}
5725 		free(line);
5726 		break;
5727 	case '(':
5728 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5729 		break;
5730 	case ')':
5731 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5732 		break;
5733 	case '{':
5734 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5735 		break;
5736 	case '}':
5737 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5738 		break;
5739 	case '[':
5740 		if (s->diff_context > 0) {
5741 			s->diff_context--;
5742 			s->matched_line = 0;
5743 			diff_view_indicate_progress(view);
5744 			err = create_diff(s);
5745 			if (s->first_displayed_line + view->nlines - 1 >
5746 			    s->nlines) {
5747 				s->first_displayed_line = 1;
5748 				s->last_displayed_line = view->nlines;
5749 			}
5750 		} else
5751 			view->count = 0;
5752 		break;
5753 	case ']':
5754 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5755 			s->diff_context++;
5756 			s->matched_line = 0;
5757 			diff_view_indicate_progress(view);
5758 			err = create_diff(s);
5759 		} else
5760 			view->count = 0;
5761 		break;
5762 	case '<':
5763 	case ',':
5764 	case 'K':
5765 		up = 1;
5766 		/* FALL THROUGH */
5767 	case '>':
5768 	case '.':
5769 	case 'J':
5770 		if (s->parent_view == NULL) {
5771 			view->count = 0;
5772 			break;
5773 		}
5774 		s->parent_view->count = view->count;
5775 
5776 		if (s->parent_view->type == TOG_VIEW_LOG) {
5777 			ls = &s->parent_view->state.log;
5778 			old_selected_entry = ls->selected_entry;
5779 
5780 			err = input_log_view(NULL, s->parent_view,
5781 			    up ? KEY_UP : KEY_DOWN);
5782 			if (err)
5783 				break;
5784 			view->count = s->parent_view->count;
5785 
5786 			if (old_selected_entry == ls->selected_entry)
5787 				break;
5788 
5789 			err = set_selected_commit(s, ls->selected_entry);
5790 			if (err)
5791 				break;
5792 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5793 			struct tog_blame_view_state *bs;
5794 			struct got_object_id *id, *prev_id;
5795 
5796 			bs = &s->parent_view->state.blame;
5797 			prev_id = get_annotation_for_line(bs->blame.lines,
5798 			    bs->blame.nlines, bs->last_diffed_line);
5799 
5800 			err = input_blame_view(&view, s->parent_view,
5801 			    up ? KEY_UP : KEY_DOWN);
5802 			if (err)
5803 				break;
5804 			view->count = s->parent_view->count;
5805 
5806 			if (prev_id == NULL)
5807 				break;
5808 			id = get_selected_commit_id(bs->blame.lines,
5809 			    bs->blame.nlines, bs->first_displayed_line,
5810 			    bs->selected_line);
5811 			if (id == NULL)
5812 				break;
5813 
5814 			if (!got_object_id_cmp(prev_id, id))
5815 				break;
5816 
5817 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5818 			if (err)
5819 				break;
5820 		}
5821 		s->first_displayed_line = 1;
5822 		s->last_displayed_line = view->nlines;
5823 		s->matched_line = 0;
5824 		view->x = 0;
5825 
5826 		diff_view_indicate_progress(view);
5827 		err = create_diff(s);
5828 		break;
5829 	default:
5830 		view->count = 0;
5831 		break;
5832 	}
5833 
5834 	return err;
5835 }
5836 
5837 static const struct got_error *
5838 cmd_diff(int argc, char *argv[])
5839 {
5840 	const struct got_error *error;
5841 	struct got_repository *repo = NULL;
5842 	struct got_worktree *worktree = NULL;
5843 	struct got_object_id *id1 = NULL, *id2 = NULL;
5844 	char *repo_path = NULL, *cwd = NULL;
5845 	char *id_str1 = NULL, *id_str2 = NULL;
5846 	char *label1 = NULL, *label2 = NULL;
5847 	int diff_context = 3, ignore_whitespace = 0;
5848 	int ch, force_text_diff = 0;
5849 	const char *errstr;
5850 	struct tog_view *view;
5851 	int *pack_fds = NULL;
5852 
5853 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5854 		switch (ch) {
5855 		case 'a':
5856 			force_text_diff = 1;
5857 			break;
5858 		case 'C':
5859 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5860 			    &errstr);
5861 			if (errstr != NULL)
5862 				errx(1, "number of context lines is %s: %s",
5863 				    errstr, errstr);
5864 			break;
5865 		case 'r':
5866 			repo_path = realpath(optarg, NULL);
5867 			if (repo_path == NULL)
5868 				return got_error_from_errno2("realpath",
5869 				    optarg);
5870 			got_path_strip_trailing_slashes(repo_path);
5871 			break;
5872 		case 'w':
5873 			ignore_whitespace = 1;
5874 			break;
5875 		default:
5876 			usage_diff();
5877 			/* NOTREACHED */
5878 		}
5879 	}
5880 
5881 	argc -= optind;
5882 	argv += optind;
5883 
5884 	if (argc == 0) {
5885 		usage_diff(); /* TODO show local worktree changes */
5886 	} else if (argc == 2) {
5887 		id_str1 = argv[0];
5888 		id_str2 = argv[1];
5889 	} else
5890 		usage_diff();
5891 
5892 	error = got_repo_pack_fds_open(&pack_fds);
5893 	if (error)
5894 		goto done;
5895 
5896 	if (repo_path == NULL) {
5897 		cwd = getcwd(NULL, 0);
5898 		if (cwd == NULL)
5899 			return got_error_from_errno("getcwd");
5900 		error = got_worktree_open(&worktree, cwd);
5901 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5902 			goto done;
5903 		if (worktree)
5904 			repo_path =
5905 			    strdup(got_worktree_get_repo_path(worktree));
5906 		else
5907 			repo_path = strdup(cwd);
5908 		if (repo_path == NULL) {
5909 			error = got_error_from_errno("strdup");
5910 			goto done;
5911 		}
5912 	}
5913 
5914 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5915 	if (error)
5916 		goto done;
5917 
5918 	init_curses();
5919 
5920 	error = apply_unveil(got_repo_get_path(repo), NULL);
5921 	if (error)
5922 		goto done;
5923 
5924 	error = tog_load_refs(repo, 0);
5925 	if (error)
5926 		goto done;
5927 
5928 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5929 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5930 	if (error)
5931 		goto done;
5932 
5933 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5934 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5935 	if (error)
5936 		goto done;
5937 
5938 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5939 	if (view == NULL) {
5940 		error = got_error_from_errno("view_open");
5941 		goto done;
5942 	}
5943 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5944 	    ignore_whitespace, force_text_diff, NULL,  repo);
5945 	if (error)
5946 		goto done;
5947 	error = view_loop(view);
5948 done:
5949 	free(label1);
5950 	free(label2);
5951 	free(repo_path);
5952 	free(cwd);
5953 	if (repo) {
5954 		const struct got_error *close_err = got_repo_close(repo);
5955 		if (error == NULL)
5956 			error = close_err;
5957 	}
5958 	if (worktree)
5959 		got_worktree_close(worktree);
5960 	if (pack_fds) {
5961 		const struct got_error *pack_err =
5962 		    got_repo_pack_fds_close(pack_fds);
5963 		if (error == NULL)
5964 			error = pack_err;
5965 	}
5966 	tog_free_refs();
5967 	return error;
5968 }
5969 
5970 __dead static void
5971 usage_blame(void)
5972 {
5973 	endwin();
5974 	fprintf(stderr,
5975 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5976 	    getprogname());
5977 	exit(1);
5978 }
5979 
5980 struct tog_blame_line {
5981 	int annotated;
5982 	struct got_object_id *id;
5983 };
5984 
5985 static const struct got_error *
5986 draw_blame(struct tog_view *view)
5987 {
5988 	struct tog_blame_view_state *s = &view->state.blame;
5989 	struct tog_blame *blame = &s->blame;
5990 	regmatch_t *regmatch = &view->regmatch;
5991 	const struct got_error *err;
5992 	int lineno = 0, nprinted = 0;
5993 	char *line = NULL;
5994 	size_t linesize = 0;
5995 	ssize_t linelen;
5996 	wchar_t *wline;
5997 	int width;
5998 	struct tog_blame_line *blame_line;
5999 	struct got_object_id *prev_id = NULL;
6000 	char *id_str;
6001 	struct tog_color *tc;
6002 
6003 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6004 	if (err)
6005 		return err;
6006 
6007 	rewind(blame->f);
6008 	werase(view->window);
6009 
6010 	if (asprintf(&line, "commit %s", id_str) == -1) {
6011 		err = got_error_from_errno("asprintf");
6012 		free(id_str);
6013 		return err;
6014 	}
6015 
6016 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6017 	free(line);
6018 	line = NULL;
6019 	if (err)
6020 		return err;
6021 	if (view_needs_focus_indication(view))
6022 		wstandout(view->window);
6023 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6024 	if (tc)
6025 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6026 	waddwstr(view->window, wline);
6027 	while (width++ < view->ncols)
6028 		waddch(view->window, ' ');
6029 	if (tc)
6030 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6031 	if (view_needs_focus_indication(view))
6032 		wstandend(view->window);
6033 	free(wline);
6034 	wline = NULL;
6035 
6036 	if (view->gline > blame->nlines)
6037 		view->gline = blame->nlines;
6038 
6039 	if (tog_io.wait_for_ui) {
6040 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6041 		int rc;
6042 
6043 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6044 		if (rc)
6045 			return got_error_set_errno(rc, "pthread_cond_wait");
6046 		tog_io.wait_for_ui = 0;
6047 	}
6048 
6049 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6050 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6051 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6052 		free(id_str);
6053 		return got_error_from_errno("asprintf");
6054 	}
6055 	free(id_str);
6056 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6057 	free(line);
6058 	line = NULL;
6059 	if (err)
6060 		return err;
6061 	waddwstr(view->window, wline);
6062 	free(wline);
6063 	wline = NULL;
6064 	if (width < view->ncols - 1)
6065 		waddch(view->window, '\n');
6066 
6067 	s->eof = 0;
6068 	view->maxx = 0;
6069 	while (nprinted < view->nlines - 2) {
6070 		linelen = getline(&line, &linesize, blame->f);
6071 		if (linelen == -1) {
6072 			if (feof(blame->f)) {
6073 				s->eof = 1;
6074 				break;
6075 			}
6076 			free(line);
6077 			return got_ferror(blame->f, GOT_ERR_IO);
6078 		}
6079 		if (++lineno < s->first_displayed_line)
6080 			continue;
6081 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6082 			continue;
6083 
6084 		/* Set view->maxx based on full line length. */
6085 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6086 		if (err) {
6087 			free(line);
6088 			return err;
6089 		}
6090 		free(wline);
6091 		wline = NULL;
6092 		view->maxx = MAX(view->maxx, width);
6093 
6094 		if (nprinted == s->selected_line - 1)
6095 			wstandout(view->window);
6096 
6097 		if (blame->nlines > 0) {
6098 			blame_line = &blame->lines[lineno - 1];
6099 			if (blame_line->annotated && prev_id &&
6100 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6101 			    !(nprinted == s->selected_line - 1)) {
6102 				waddstr(view->window, "        ");
6103 			} else if (blame_line->annotated) {
6104 				char *id_str;
6105 				err = got_object_id_str(&id_str,
6106 				    blame_line->id);
6107 				if (err) {
6108 					free(line);
6109 					return err;
6110 				}
6111 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6112 				if (tc)
6113 					wattr_on(view->window,
6114 					    COLOR_PAIR(tc->colorpair), NULL);
6115 				wprintw(view->window, "%.8s", id_str);
6116 				if (tc)
6117 					wattr_off(view->window,
6118 					    COLOR_PAIR(tc->colorpair), NULL);
6119 				free(id_str);
6120 				prev_id = blame_line->id;
6121 			} else {
6122 				waddstr(view->window, "........");
6123 				prev_id = NULL;
6124 			}
6125 		} else {
6126 			waddstr(view->window, "........");
6127 			prev_id = NULL;
6128 		}
6129 
6130 		if (nprinted == s->selected_line - 1)
6131 			wstandend(view->window);
6132 		waddstr(view->window, " ");
6133 
6134 		if (view->ncols <= 9) {
6135 			width = 9;
6136 		} else if (s->first_displayed_line + nprinted ==
6137 		    s->matched_line &&
6138 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6139 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6140 			    view->window, view->x, regmatch);
6141 			if (err) {
6142 				free(line);
6143 				return err;
6144 			}
6145 			width += 9;
6146 		} else {
6147 			int skip;
6148 			err = format_line(&wline, &width, &skip, line,
6149 			    view->x, view->ncols - 9, 9, 1);
6150 			if (err) {
6151 				free(line);
6152 				return err;
6153 			}
6154 			waddwstr(view->window, &wline[skip]);
6155 			width += 9;
6156 			free(wline);
6157 			wline = NULL;
6158 		}
6159 
6160 		if (width <= view->ncols - 1)
6161 			waddch(view->window, '\n');
6162 		if (++nprinted == 1)
6163 			s->first_displayed_line = lineno;
6164 	}
6165 	free(line);
6166 	s->last_displayed_line = lineno;
6167 
6168 	view_border(view);
6169 
6170 	return NULL;
6171 }
6172 
6173 static const struct got_error *
6174 blame_cb(void *arg, int nlines, int lineno,
6175     struct got_commit_object *commit, struct got_object_id *id)
6176 {
6177 	const struct got_error *err = NULL;
6178 	struct tog_blame_cb_args *a = arg;
6179 	struct tog_blame_line *line;
6180 	int errcode;
6181 
6182 	if (nlines != a->nlines ||
6183 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6184 		return got_error(GOT_ERR_RANGE);
6185 
6186 	errcode = pthread_mutex_lock(&tog_mutex);
6187 	if (errcode)
6188 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6189 
6190 	if (*a->quit) {	/* user has quit the blame view */
6191 		err = got_error(GOT_ERR_ITER_COMPLETED);
6192 		goto done;
6193 	}
6194 
6195 	if (lineno == -1)
6196 		goto done; /* no change in this commit */
6197 
6198 	line = &a->lines[lineno - 1];
6199 	if (line->annotated)
6200 		goto done;
6201 
6202 	line->id = got_object_id_dup(id);
6203 	if (line->id == NULL) {
6204 		err = got_error_from_errno("got_object_id_dup");
6205 		goto done;
6206 	}
6207 	line->annotated = 1;
6208 done:
6209 	errcode = pthread_mutex_unlock(&tog_mutex);
6210 	if (errcode)
6211 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6212 	return err;
6213 }
6214 
6215 static void *
6216 blame_thread(void *arg)
6217 {
6218 	const struct got_error *err, *close_err;
6219 	struct tog_blame_thread_args *ta = arg;
6220 	struct tog_blame_cb_args *a = ta->cb_args;
6221 	int errcode, fd1 = -1, fd2 = -1;
6222 	FILE *f1 = NULL, *f2 = NULL;
6223 
6224 	fd1 = got_opentempfd();
6225 	if (fd1 == -1)
6226 		return (void *)got_error_from_errno("got_opentempfd");
6227 
6228 	fd2 = got_opentempfd();
6229 	if (fd2 == -1) {
6230 		err = got_error_from_errno("got_opentempfd");
6231 		goto done;
6232 	}
6233 
6234 	f1 = got_opentemp();
6235 	if (f1 == NULL) {
6236 		err = (void *)got_error_from_errno("got_opentemp");
6237 		goto done;
6238 	}
6239 	f2 = got_opentemp();
6240 	if (f2 == NULL) {
6241 		err = (void *)got_error_from_errno("got_opentemp");
6242 		goto done;
6243 	}
6244 
6245 	err = block_signals_used_by_main_thread();
6246 	if (err)
6247 		goto done;
6248 
6249 	err = got_blame(ta->path, a->commit_id, ta->repo,
6250 	    tog_diff_algo, blame_cb, ta->cb_args,
6251 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6252 	if (err && err->code == GOT_ERR_CANCELLED)
6253 		err = NULL;
6254 
6255 	errcode = pthread_mutex_lock(&tog_mutex);
6256 	if (errcode) {
6257 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6258 		goto done;
6259 	}
6260 
6261 	close_err = got_repo_close(ta->repo);
6262 	if (err == NULL)
6263 		err = close_err;
6264 	ta->repo = NULL;
6265 	*ta->complete = 1;
6266 
6267 	if (tog_io.wait_for_ui) {
6268 		errcode = pthread_cond_signal(&ta->blame_complete);
6269 		if (errcode && err == NULL)
6270 			err = got_error_set_errno(errcode,
6271 			    "pthread_cond_signal");
6272 	}
6273 
6274 	errcode = pthread_mutex_unlock(&tog_mutex);
6275 	if (errcode && err == NULL)
6276 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6277 
6278 done:
6279 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6280 		err = got_error_from_errno("close");
6281 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6282 		err = got_error_from_errno("close");
6283 	if (f1 && fclose(f1) == EOF && err == NULL)
6284 		err = got_error_from_errno("fclose");
6285 	if (f2 && fclose(f2) == EOF && err == NULL)
6286 		err = got_error_from_errno("fclose");
6287 
6288 	return (void *)err;
6289 }
6290 
6291 static struct got_object_id *
6292 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6293     int first_displayed_line, int selected_line)
6294 {
6295 	struct tog_blame_line *line;
6296 
6297 	if (nlines <= 0)
6298 		return NULL;
6299 
6300 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6301 	if (!line->annotated)
6302 		return NULL;
6303 
6304 	return line->id;
6305 }
6306 
6307 static struct got_object_id *
6308 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6309     int lineno)
6310 {
6311 	struct tog_blame_line *line;
6312 
6313 	if (nlines <= 0 || lineno >= nlines)
6314 		return NULL;
6315 
6316 	line = &lines[lineno - 1];
6317 	if (!line->annotated)
6318 		return NULL;
6319 
6320 	return line->id;
6321 }
6322 
6323 static const struct got_error *
6324 stop_blame(struct tog_blame *blame)
6325 {
6326 	const struct got_error *err = NULL;
6327 	int i;
6328 
6329 	if (blame->thread) {
6330 		int errcode;
6331 		errcode = pthread_mutex_unlock(&tog_mutex);
6332 		if (errcode)
6333 			return got_error_set_errno(errcode,
6334 			    "pthread_mutex_unlock");
6335 		errcode = pthread_join(blame->thread, (void **)&err);
6336 		if (errcode)
6337 			return got_error_set_errno(errcode, "pthread_join");
6338 		errcode = pthread_mutex_lock(&tog_mutex);
6339 		if (errcode)
6340 			return got_error_set_errno(errcode,
6341 			    "pthread_mutex_lock");
6342 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6343 			err = NULL;
6344 		blame->thread = 0; //NULL;
6345 	}
6346 	if (blame->thread_args.repo) {
6347 		const struct got_error *close_err;
6348 		close_err = got_repo_close(blame->thread_args.repo);
6349 		if (err == NULL)
6350 			err = close_err;
6351 		blame->thread_args.repo = NULL;
6352 	}
6353 	if (blame->f) {
6354 		if (fclose(blame->f) == EOF && err == NULL)
6355 			err = got_error_from_errno("fclose");
6356 		blame->f = NULL;
6357 	}
6358 	if (blame->lines) {
6359 		for (i = 0; i < blame->nlines; i++)
6360 			free(blame->lines[i].id);
6361 		free(blame->lines);
6362 		blame->lines = NULL;
6363 	}
6364 	free(blame->cb_args.commit_id);
6365 	blame->cb_args.commit_id = NULL;
6366 	if (blame->pack_fds) {
6367 		const struct got_error *pack_err =
6368 		    got_repo_pack_fds_close(blame->pack_fds);
6369 		if (err == NULL)
6370 			err = pack_err;
6371 		blame->pack_fds = NULL;
6372 	}
6373 	return err;
6374 }
6375 
6376 static const struct got_error *
6377 cancel_blame_view(void *arg)
6378 {
6379 	const struct got_error *err = NULL;
6380 	int *done = arg;
6381 	int errcode;
6382 
6383 	errcode = pthread_mutex_lock(&tog_mutex);
6384 	if (errcode)
6385 		return got_error_set_errno(errcode,
6386 		    "pthread_mutex_unlock");
6387 
6388 	if (*done)
6389 		err = got_error(GOT_ERR_CANCELLED);
6390 
6391 	errcode = pthread_mutex_unlock(&tog_mutex);
6392 	if (errcode)
6393 		return got_error_set_errno(errcode,
6394 		    "pthread_mutex_lock");
6395 
6396 	return err;
6397 }
6398 
6399 static const struct got_error *
6400 run_blame(struct tog_view *view)
6401 {
6402 	struct tog_blame_view_state *s = &view->state.blame;
6403 	struct tog_blame *blame = &s->blame;
6404 	const struct got_error *err = NULL;
6405 	struct got_commit_object *commit = NULL;
6406 	struct got_blob_object *blob = NULL;
6407 	struct got_repository *thread_repo = NULL;
6408 	struct got_object_id *obj_id = NULL;
6409 	int obj_type, fd = -1;
6410 	int *pack_fds = NULL;
6411 
6412 	err = got_object_open_as_commit(&commit, s->repo,
6413 	    &s->blamed_commit->id);
6414 	if (err)
6415 		return err;
6416 
6417 	fd = got_opentempfd();
6418 	if (fd == -1) {
6419 		err = got_error_from_errno("got_opentempfd");
6420 		goto done;
6421 	}
6422 
6423 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6424 	if (err)
6425 		goto done;
6426 
6427 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6428 	if (err)
6429 		goto done;
6430 
6431 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6432 		err = got_error(GOT_ERR_OBJ_TYPE);
6433 		goto done;
6434 	}
6435 
6436 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6437 	if (err)
6438 		goto done;
6439 	blame->f = got_opentemp();
6440 	if (blame->f == NULL) {
6441 		err = got_error_from_errno("got_opentemp");
6442 		goto done;
6443 	}
6444 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6445 	    &blame->line_offsets, blame->f, blob);
6446 	if (err)
6447 		goto done;
6448 	if (blame->nlines == 0) {
6449 		s->blame_complete = 1;
6450 		goto done;
6451 	}
6452 
6453 	/* Don't include \n at EOF in the blame line count. */
6454 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6455 		blame->nlines--;
6456 
6457 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6458 	if (blame->lines == NULL) {
6459 		err = got_error_from_errno("calloc");
6460 		goto done;
6461 	}
6462 
6463 	err = got_repo_pack_fds_open(&pack_fds);
6464 	if (err)
6465 		goto done;
6466 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6467 	    pack_fds);
6468 	if (err)
6469 		goto done;
6470 
6471 	blame->pack_fds = pack_fds;
6472 	blame->cb_args.view = view;
6473 	blame->cb_args.lines = blame->lines;
6474 	blame->cb_args.nlines = blame->nlines;
6475 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6476 	if (blame->cb_args.commit_id == NULL) {
6477 		err = got_error_from_errno("got_object_id_dup");
6478 		goto done;
6479 	}
6480 	blame->cb_args.quit = &s->done;
6481 
6482 	blame->thread_args.path = s->path;
6483 	blame->thread_args.repo = thread_repo;
6484 	blame->thread_args.cb_args = &blame->cb_args;
6485 	blame->thread_args.complete = &s->blame_complete;
6486 	blame->thread_args.cancel_cb = cancel_blame_view;
6487 	blame->thread_args.cancel_arg = &s->done;
6488 	s->blame_complete = 0;
6489 
6490 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6491 		s->first_displayed_line = 1;
6492 		s->last_displayed_line = view->nlines;
6493 		s->selected_line = 1;
6494 	}
6495 	s->matched_line = 0;
6496 
6497 done:
6498 	if (commit)
6499 		got_object_commit_close(commit);
6500 	if (fd != -1 && close(fd) == -1 && err == NULL)
6501 		err = got_error_from_errno("close");
6502 	if (blob)
6503 		got_object_blob_close(blob);
6504 	free(obj_id);
6505 	if (err)
6506 		stop_blame(blame);
6507 	return err;
6508 }
6509 
6510 static const struct got_error *
6511 open_blame_view(struct tog_view *view, char *path,
6512     struct got_object_id *commit_id, struct got_repository *repo)
6513 {
6514 	const struct got_error *err = NULL;
6515 	struct tog_blame_view_state *s = &view->state.blame;
6516 
6517 	STAILQ_INIT(&s->blamed_commits);
6518 
6519 	s->path = strdup(path);
6520 	if (s->path == NULL)
6521 		return got_error_from_errno("strdup");
6522 
6523 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6524 	if (err) {
6525 		free(s->path);
6526 		return err;
6527 	}
6528 
6529 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6530 	s->first_displayed_line = 1;
6531 	s->last_displayed_line = view->nlines;
6532 	s->selected_line = 1;
6533 	s->blame_complete = 0;
6534 	s->repo = repo;
6535 	s->commit_id = commit_id;
6536 	memset(&s->blame, 0, sizeof(s->blame));
6537 
6538 	STAILQ_INIT(&s->colors);
6539 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6540 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6541 		    get_color_value("TOG_COLOR_COMMIT"));
6542 		if (err)
6543 			return err;
6544 	}
6545 
6546 	view->show = show_blame_view;
6547 	view->input = input_blame_view;
6548 	view->reset = reset_blame_view;
6549 	view->close = close_blame_view;
6550 	view->search_start = search_start_blame_view;
6551 	view->search_setup = search_setup_blame_view;
6552 	view->search_next = search_next_view_match;
6553 
6554 	if (using_mock_io) {
6555 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6556 		int rc;
6557 
6558 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6559 		if (rc)
6560 			return got_error_set_errno(rc, "pthread_cond_init");
6561 	}
6562 
6563 	return run_blame(view);
6564 }
6565 
6566 static const struct got_error *
6567 close_blame_view(struct tog_view *view)
6568 {
6569 	const struct got_error *err = NULL;
6570 	struct tog_blame_view_state *s = &view->state.blame;
6571 
6572 	if (s->blame.thread)
6573 		err = stop_blame(&s->blame);
6574 
6575 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6576 		struct got_object_qid *blamed_commit;
6577 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6578 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6579 		got_object_qid_free(blamed_commit);
6580 	}
6581 
6582 	if (using_mock_io) {
6583 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6584 		int rc;
6585 
6586 		rc = pthread_cond_destroy(&bta->blame_complete);
6587 		if (rc && err == NULL)
6588 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6589 	}
6590 
6591 	free(s->path);
6592 	free_colors(&s->colors);
6593 	return err;
6594 }
6595 
6596 static const struct got_error *
6597 search_start_blame_view(struct tog_view *view)
6598 {
6599 	struct tog_blame_view_state *s = &view->state.blame;
6600 
6601 	s->matched_line = 0;
6602 	return NULL;
6603 }
6604 
6605 static void
6606 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6607     size_t *nlines, int **first, int **last, int **match, int **selected)
6608 {
6609 	struct tog_blame_view_state *s = &view->state.blame;
6610 
6611 	*f = s->blame.f;
6612 	*nlines = s->blame.nlines;
6613 	*line_offsets = s->blame.line_offsets;
6614 	*match = &s->matched_line;
6615 	*first = &s->first_displayed_line;
6616 	*last = &s->last_displayed_line;
6617 	*selected = &s->selected_line;
6618 }
6619 
6620 static const struct got_error *
6621 show_blame_view(struct tog_view *view)
6622 {
6623 	const struct got_error *err = NULL;
6624 	struct tog_blame_view_state *s = &view->state.blame;
6625 	int errcode;
6626 
6627 	if (s->blame.thread == 0 && !s->blame_complete) {
6628 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6629 		    &s->blame.thread_args);
6630 		if (errcode)
6631 			return got_error_set_errno(errcode, "pthread_create");
6632 
6633 		if (!using_mock_io)
6634 			halfdelay(1); /* fast refresh while annotating  */
6635 	}
6636 
6637 	if (s->blame_complete && !using_mock_io)
6638 		halfdelay(10); /* disable fast refresh */
6639 
6640 	err = draw_blame(view);
6641 
6642 	view_border(view);
6643 	return err;
6644 }
6645 
6646 static const struct got_error *
6647 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6648     struct got_repository *repo, struct got_object_id *id)
6649 {
6650 	struct tog_view		*log_view;
6651 	const struct got_error	*err = NULL;
6652 
6653 	*new_view = NULL;
6654 
6655 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6656 	if (log_view == NULL)
6657 		return got_error_from_errno("view_open");
6658 
6659 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6660 	if (err)
6661 		view_close(log_view);
6662 	else
6663 		*new_view = log_view;
6664 
6665 	return err;
6666 }
6667 
6668 static const struct got_error *
6669 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6670 {
6671 	const struct got_error *err = NULL, *thread_err = NULL;
6672 	struct tog_view *diff_view;
6673 	struct tog_blame_view_state *s = &view->state.blame;
6674 	int eos, nscroll, begin_y = 0, begin_x = 0;
6675 
6676 	eos = nscroll = view->nlines - 2;
6677 	if (view_is_hsplit_top(view))
6678 		--eos;  /* border */
6679 
6680 	switch (ch) {
6681 	case '0':
6682 	case '$':
6683 	case KEY_RIGHT:
6684 	case 'l':
6685 	case KEY_LEFT:
6686 	case 'h':
6687 		horizontal_scroll_input(view, ch);
6688 		break;
6689 	case 'q':
6690 		s->done = 1;
6691 		break;
6692 	case 'g':
6693 	case KEY_HOME:
6694 		s->selected_line = 1;
6695 		s->first_displayed_line = 1;
6696 		view->count = 0;
6697 		break;
6698 	case 'G':
6699 	case KEY_END:
6700 		if (s->blame.nlines < eos) {
6701 			s->selected_line = s->blame.nlines;
6702 			s->first_displayed_line = 1;
6703 		} else {
6704 			s->selected_line = eos;
6705 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6706 		}
6707 		view->count = 0;
6708 		break;
6709 	case 'k':
6710 	case KEY_UP:
6711 	case CTRL('p'):
6712 		if (s->selected_line > 1)
6713 			s->selected_line--;
6714 		else if (s->selected_line == 1 &&
6715 		    s->first_displayed_line > 1)
6716 			s->first_displayed_line--;
6717 		else
6718 			view->count = 0;
6719 		break;
6720 	case CTRL('u'):
6721 	case 'u':
6722 		nscroll /= 2;
6723 		/* FALL THROUGH */
6724 	case KEY_PPAGE:
6725 	case CTRL('b'):
6726 	case 'b':
6727 		if (s->first_displayed_line == 1) {
6728 			if (view->count > 1)
6729 				nscroll += nscroll;
6730 			s->selected_line = MAX(1, s->selected_line - nscroll);
6731 			view->count = 0;
6732 			break;
6733 		}
6734 		if (s->first_displayed_line > nscroll)
6735 			s->first_displayed_line -= nscroll;
6736 		else
6737 			s->first_displayed_line = 1;
6738 		break;
6739 	case 'j':
6740 	case KEY_DOWN:
6741 	case CTRL('n'):
6742 		if (s->selected_line < eos && s->first_displayed_line +
6743 		    s->selected_line <= s->blame.nlines)
6744 			s->selected_line++;
6745 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6746 			s->first_displayed_line++;
6747 		else
6748 			view->count = 0;
6749 		break;
6750 	case 'c':
6751 	case 'p': {
6752 		struct got_object_id *id = NULL;
6753 
6754 		view->count = 0;
6755 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6756 		    s->first_displayed_line, s->selected_line);
6757 		if (id == NULL)
6758 			break;
6759 		if (ch == 'p') {
6760 			struct got_commit_object *commit, *pcommit;
6761 			struct got_object_qid *pid;
6762 			struct got_object_id *blob_id = NULL;
6763 			int obj_type;
6764 			err = got_object_open_as_commit(&commit,
6765 			    s->repo, id);
6766 			if (err)
6767 				break;
6768 			pid = STAILQ_FIRST(
6769 			    got_object_commit_get_parent_ids(commit));
6770 			if (pid == NULL) {
6771 				got_object_commit_close(commit);
6772 				break;
6773 			}
6774 			/* Check if path history ends here. */
6775 			err = got_object_open_as_commit(&pcommit,
6776 			    s->repo, &pid->id);
6777 			if (err)
6778 				break;
6779 			err = got_object_id_by_path(&blob_id, s->repo,
6780 			    pcommit, s->path);
6781 			got_object_commit_close(pcommit);
6782 			if (err) {
6783 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6784 					err = NULL;
6785 				got_object_commit_close(commit);
6786 				break;
6787 			}
6788 			err = got_object_get_type(&obj_type, s->repo,
6789 			    blob_id);
6790 			free(blob_id);
6791 			/* Can't blame non-blob type objects. */
6792 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6793 				got_object_commit_close(commit);
6794 				break;
6795 			}
6796 			err = got_object_qid_alloc(&s->blamed_commit,
6797 			    &pid->id);
6798 			got_object_commit_close(commit);
6799 		} else {
6800 			if (got_object_id_cmp(id,
6801 			    &s->blamed_commit->id) == 0)
6802 				break;
6803 			err = got_object_qid_alloc(&s->blamed_commit,
6804 			    id);
6805 		}
6806 		if (err)
6807 			break;
6808 		s->done = 1;
6809 		thread_err = stop_blame(&s->blame);
6810 		s->done = 0;
6811 		if (thread_err)
6812 			break;
6813 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6814 		    s->blamed_commit, entry);
6815 		err = run_blame(view);
6816 		if (err)
6817 			break;
6818 		break;
6819 	}
6820 	case 'C': {
6821 		struct got_object_qid *first;
6822 
6823 		view->count = 0;
6824 		first = STAILQ_FIRST(&s->blamed_commits);
6825 		if (!got_object_id_cmp(&first->id, s->commit_id))
6826 			break;
6827 		s->done = 1;
6828 		thread_err = stop_blame(&s->blame);
6829 		s->done = 0;
6830 		if (thread_err)
6831 			break;
6832 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6833 		got_object_qid_free(s->blamed_commit);
6834 		s->blamed_commit =
6835 		    STAILQ_FIRST(&s->blamed_commits);
6836 		err = run_blame(view);
6837 		if (err)
6838 			break;
6839 		break;
6840 	}
6841 	case 'L':
6842 		view->count = 0;
6843 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6844 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6845 		if (s->id_to_log)
6846 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6847 		break;
6848 	case KEY_ENTER:
6849 	case '\r': {
6850 		struct got_object_id *id = NULL;
6851 		struct got_object_qid *pid;
6852 		struct got_commit_object *commit = NULL;
6853 
6854 		view->count = 0;
6855 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6856 		    s->first_displayed_line, s->selected_line);
6857 		if (id == NULL)
6858 			break;
6859 		err = got_object_open_as_commit(&commit, s->repo, id);
6860 		if (err)
6861 			break;
6862 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6863 		if (*new_view) {
6864 			/* traversed from diff view, release diff resources  */
6865 			err = close_diff_view(*new_view);
6866 			if (err)
6867 				break;
6868 			diff_view = *new_view;
6869 		} else {
6870 			if (view_is_parent_view(view))
6871 				view_get_split(view, &begin_y, &begin_x);
6872 
6873 			diff_view = view_open(0, 0, begin_y, begin_x,
6874 			    TOG_VIEW_DIFF);
6875 			if (diff_view == NULL) {
6876 				got_object_commit_close(commit);
6877 				err = got_error_from_errno("view_open");
6878 				break;
6879 			}
6880 		}
6881 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6882 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6883 		got_object_commit_close(commit);
6884 		if (err) {
6885 			view_close(diff_view);
6886 			break;
6887 		}
6888 		s->last_diffed_line = s->first_displayed_line - 1 +
6889 		    s->selected_line;
6890 		if (*new_view)
6891 			break;	/* still open from active diff view */
6892 		if (view_is_parent_view(view) &&
6893 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6894 			err = view_init_hsplit(view, begin_y);
6895 			if (err)
6896 				break;
6897 		}
6898 
6899 		view->focussed = 0;
6900 		diff_view->focussed = 1;
6901 		diff_view->mode = view->mode;
6902 		diff_view->nlines = view->lines - begin_y;
6903 		if (view_is_parent_view(view)) {
6904 			view_transfer_size(diff_view, view);
6905 			err = view_close_child(view);
6906 			if (err)
6907 				break;
6908 			err = view_set_child(view, diff_view);
6909 			if (err)
6910 				break;
6911 			view->focus_child = 1;
6912 		} else
6913 			*new_view = diff_view;
6914 		if (err)
6915 			break;
6916 		break;
6917 	}
6918 	case CTRL('d'):
6919 	case 'd':
6920 		nscroll /= 2;
6921 		/* FALL THROUGH */
6922 	case KEY_NPAGE:
6923 	case CTRL('f'):
6924 	case 'f':
6925 	case ' ':
6926 		if (s->last_displayed_line >= s->blame.nlines &&
6927 		    s->selected_line >= MIN(s->blame.nlines,
6928 		    view->nlines - 2)) {
6929 			view->count = 0;
6930 			break;
6931 		}
6932 		if (s->last_displayed_line >= s->blame.nlines &&
6933 		    s->selected_line < view->nlines - 2) {
6934 			s->selected_line +=
6935 			    MIN(nscroll, s->last_displayed_line -
6936 			    s->first_displayed_line - s->selected_line + 1);
6937 		}
6938 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6939 			s->first_displayed_line += nscroll;
6940 		else
6941 			s->first_displayed_line =
6942 			    s->blame.nlines - (view->nlines - 3);
6943 		break;
6944 	case KEY_RESIZE:
6945 		if (s->selected_line > view->nlines - 2) {
6946 			s->selected_line = MIN(s->blame.nlines,
6947 			    view->nlines - 2);
6948 		}
6949 		break;
6950 	default:
6951 		view->count = 0;
6952 		break;
6953 	}
6954 	return thread_err ? thread_err : err;
6955 }
6956 
6957 static const struct got_error *
6958 reset_blame_view(struct tog_view *view)
6959 {
6960 	const struct got_error *err;
6961 	struct tog_blame_view_state *s = &view->state.blame;
6962 
6963 	view->count = 0;
6964 	s->done = 1;
6965 	err = stop_blame(&s->blame);
6966 	s->done = 0;
6967 	if (err)
6968 		return err;
6969 	return run_blame(view);
6970 }
6971 
6972 static const struct got_error *
6973 cmd_blame(int argc, char *argv[])
6974 {
6975 	const struct got_error *error;
6976 	struct got_repository *repo = NULL;
6977 	struct got_worktree *worktree = NULL;
6978 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6979 	char *link_target = NULL;
6980 	struct got_object_id *commit_id = NULL;
6981 	struct got_commit_object *commit = NULL;
6982 	char *commit_id_str = NULL;
6983 	int ch;
6984 	struct tog_view *view = NULL;
6985 	int *pack_fds = NULL;
6986 
6987 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6988 		switch (ch) {
6989 		case 'c':
6990 			commit_id_str = optarg;
6991 			break;
6992 		case 'r':
6993 			repo_path = realpath(optarg, NULL);
6994 			if (repo_path == NULL)
6995 				return got_error_from_errno2("realpath",
6996 				    optarg);
6997 			break;
6998 		default:
6999 			usage_blame();
7000 			/* NOTREACHED */
7001 		}
7002 	}
7003 
7004 	argc -= optind;
7005 	argv += optind;
7006 
7007 	if (argc != 1)
7008 		usage_blame();
7009 
7010 	error = got_repo_pack_fds_open(&pack_fds);
7011 	if (error != NULL)
7012 		goto done;
7013 
7014 	if (repo_path == NULL) {
7015 		cwd = getcwd(NULL, 0);
7016 		if (cwd == NULL)
7017 			return got_error_from_errno("getcwd");
7018 		error = got_worktree_open(&worktree, cwd);
7019 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7020 			goto done;
7021 		if (worktree)
7022 			repo_path =
7023 			    strdup(got_worktree_get_repo_path(worktree));
7024 		else
7025 			repo_path = strdup(cwd);
7026 		if (repo_path == NULL) {
7027 			error = got_error_from_errno("strdup");
7028 			goto done;
7029 		}
7030 	}
7031 
7032 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7033 	if (error != NULL)
7034 		goto done;
7035 
7036 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7037 	    worktree);
7038 	if (error)
7039 		goto done;
7040 
7041 	init_curses();
7042 
7043 	error = apply_unveil(got_repo_get_path(repo), NULL);
7044 	if (error)
7045 		goto done;
7046 
7047 	error = tog_load_refs(repo, 0);
7048 	if (error)
7049 		goto done;
7050 
7051 	if (commit_id_str == NULL) {
7052 		struct got_reference *head_ref;
7053 		error = got_ref_open(&head_ref, repo, worktree ?
7054 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7055 		if (error != NULL)
7056 			goto done;
7057 		error = got_ref_resolve(&commit_id, repo, head_ref);
7058 		got_ref_close(head_ref);
7059 	} else {
7060 		error = got_repo_match_object_id(&commit_id, NULL,
7061 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7062 	}
7063 	if (error != NULL)
7064 		goto done;
7065 
7066 	error = got_object_open_as_commit(&commit, repo, commit_id);
7067 	if (error)
7068 		goto done;
7069 
7070 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7071 	    commit, repo);
7072 	if (error)
7073 		goto done;
7074 
7075 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7076 	if (view == NULL) {
7077 		error = got_error_from_errno("view_open");
7078 		goto done;
7079 	}
7080 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7081 	    commit_id, repo);
7082 	if (error != NULL) {
7083 		if (view->close == NULL)
7084 			close_blame_view(view);
7085 		view_close(view);
7086 		goto done;
7087 	}
7088 	if (worktree) {
7089 		/* Release work tree lock. */
7090 		got_worktree_close(worktree);
7091 		worktree = NULL;
7092 	}
7093 	error = view_loop(view);
7094 done:
7095 	free(repo_path);
7096 	free(in_repo_path);
7097 	free(link_target);
7098 	free(cwd);
7099 	free(commit_id);
7100 	if (commit)
7101 		got_object_commit_close(commit);
7102 	if (worktree)
7103 		got_worktree_close(worktree);
7104 	if (repo) {
7105 		const struct got_error *close_err = got_repo_close(repo);
7106 		if (error == NULL)
7107 			error = close_err;
7108 	}
7109 	if (pack_fds) {
7110 		const struct got_error *pack_err =
7111 		    got_repo_pack_fds_close(pack_fds);
7112 		if (error == NULL)
7113 			error = pack_err;
7114 	}
7115 	tog_free_refs();
7116 	return error;
7117 }
7118 
7119 static const struct got_error *
7120 draw_tree_entries(struct tog_view *view, const char *parent_path)
7121 {
7122 	struct tog_tree_view_state *s = &view->state.tree;
7123 	const struct got_error *err = NULL;
7124 	struct got_tree_entry *te;
7125 	wchar_t *wline;
7126 	char *index = NULL;
7127 	struct tog_color *tc;
7128 	int width, n, nentries, scrollx, i = 1;
7129 	int limit = view->nlines;
7130 
7131 	s->ndisplayed = 0;
7132 	if (view_is_hsplit_top(view))
7133 		--limit;  /* border */
7134 
7135 	werase(view->window);
7136 
7137 	if (limit == 0)
7138 		return NULL;
7139 
7140 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7141 	    0, 0);
7142 	if (err)
7143 		return err;
7144 	if (view_needs_focus_indication(view))
7145 		wstandout(view->window);
7146 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7147 	if (tc)
7148 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7149 	waddwstr(view->window, wline);
7150 	free(wline);
7151 	wline = NULL;
7152 	while (width++ < view->ncols)
7153 		waddch(view->window, ' ');
7154 	if (tc)
7155 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7156 	if (view_needs_focus_indication(view))
7157 		wstandend(view->window);
7158 	if (--limit <= 0)
7159 		return NULL;
7160 
7161 	i += s->selected;
7162 	if (s->first_displayed_entry) {
7163 		i += got_tree_entry_get_index(s->first_displayed_entry);
7164 		if (s->tree != s->root)
7165 			++i;  /* account for ".." entry */
7166 	}
7167 	nentries = got_object_tree_get_nentries(s->tree);
7168 	if (asprintf(&index, "[%d/%d] %s",
7169 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7170 		return got_error_from_errno("asprintf");
7171 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7172 	free(index);
7173 	if (err)
7174 		return err;
7175 	waddwstr(view->window, wline);
7176 	free(wline);
7177 	wline = NULL;
7178 	if (width < view->ncols - 1)
7179 		waddch(view->window, '\n');
7180 	if (--limit <= 0)
7181 		return NULL;
7182 	waddch(view->window, '\n');
7183 	if (--limit <= 0)
7184 		return NULL;
7185 
7186 	if (s->first_displayed_entry == NULL) {
7187 		te = got_object_tree_get_first_entry(s->tree);
7188 		if (s->selected == 0) {
7189 			if (view->focussed)
7190 				wstandout(view->window);
7191 			s->selected_entry = NULL;
7192 		}
7193 		waddstr(view->window, "  ..\n");	/* parent directory */
7194 		if (s->selected == 0 && view->focussed)
7195 			wstandend(view->window);
7196 		s->ndisplayed++;
7197 		if (--limit <= 0)
7198 			return NULL;
7199 		n = 1;
7200 	} else {
7201 		n = 0;
7202 		te = s->first_displayed_entry;
7203 	}
7204 
7205 	view->maxx = 0;
7206 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7207 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7208 		const char *modestr = "";
7209 		mode_t mode;
7210 
7211 		te = got_object_tree_get_entry(s->tree, i);
7212 		mode = got_tree_entry_get_mode(te);
7213 
7214 		if (s->show_ids) {
7215 			err = got_object_id_str(&id_str,
7216 			    got_tree_entry_get_id(te));
7217 			if (err)
7218 				return got_error_from_errno(
7219 				    "got_object_id_str");
7220 		}
7221 		if (got_object_tree_entry_is_submodule(te))
7222 			modestr = "$";
7223 		else if (S_ISLNK(mode)) {
7224 			int i;
7225 
7226 			err = got_tree_entry_get_symlink_target(&link_target,
7227 			    te, s->repo);
7228 			if (err) {
7229 				free(id_str);
7230 				return err;
7231 			}
7232 			for (i = 0; i < strlen(link_target); i++) {
7233 				if (!isprint((unsigned char)link_target[i]))
7234 					link_target[i] = '?';
7235 			}
7236 			modestr = "@";
7237 		}
7238 		else if (S_ISDIR(mode))
7239 			modestr = "/";
7240 		else if (mode & S_IXUSR)
7241 			modestr = "*";
7242 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7243 		    got_tree_entry_get_name(te), modestr,
7244 		    link_target ? " -> ": "",
7245 		    link_target ? link_target : "") == -1) {
7246 			free(id_str);
7247 			free(link_target);
7248 			return got_error_from_errno("asprintf");
7249 		}
7250 		free(id_str);
7251 		free(link_target);
7252 
7253 		/* use full line width to determine view->maxx */
7254 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7255 		if (err) {
7256 			free(line);
7257 			break;
7258 		}
7259 		view->maxx = MAX(view->maxx, width);
7260 		free(wline);
7261 		wline = NULL;
7262 
7263 		err = format_line(&wline, &width, &scrollx, line, view->x,
7264 		    view->ncols, 0, 0);
7265 		if (err) {
7266 			free(line);
7267 			break;
7268 		}
7269 		if (n == s->selected) {
7270 			if (view->focussed)
7271 				wstandout(view->window);
7272 			s->selected_entry = te;
7273 		}
7274 		tc = match_color(&s->colors, line);
7275 		if (tc)
7276 			wattr_on(view->window,
7277 			    COLOR_PAIR(tc->colorpair), NULL);
7278 		waddwstr(view->window, &wline[scrollx]);
7279 		if (tc)
7280 			wattr_off(view->window,
7281 			    COLOR_PAIR(tc->colorpair), NULL);
7282 		if (width < view->ncols)
7283 			waddch(view->window, '\n');
7284 		if (n == s->selected && view->focussed)
7285 			wstandend(view->window);
7286 		free(line);
7287 		free(wline);
7288 		wline = NULL;
7289 		n++;
7290 		s->ndisplayed++;
7291 		s->last_displayed_entry = te;
7292 		if (--limit <= 0)
7293 			break;
7294 	}
7295 
7296 	return err;
7297 }
7298 
7299 static void
7300 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7301 {
7302 	struct got_tree_entry *te;
7303 	int isroot = s->tree == s->root;
7304 	int i = 0;
7305 
7306 	if (s->first_displayed_entry == NULL)
7307 		return;
7308 
7309 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7310 	while (i++ < maxscroll) {
7311 		if (te == NULL) {
7312 			if (!isroot)
7313 				s->first_displayed_entry = NULL;
7314 			break;
7315 		}
7316 		s->first_displayed_entry = te;
7317 		te = got_tree_entry_get_prev(s->tree, te);
7318 	}
7319 }
7320 
7321 static const struct got_error *
7322 tree_scroll_down(struct tog_view *view, int maxscroll)
7323 {
7324 	struct tog_tree_view_state *s = &view->state.tree;
7325 	struct got_tree_entry *next, *last;
7326 	int n = 0;
7327 
7328 	if (s->first_displayed_entry)
7329 		next = got_tree_entry_get_next(s->tree,
7330 		    s->first_displayed_entry);
7331 	else
7332 		next = got_object_tree_get_first_entry(s->tree);
7333 
7334 	last = s->last_displayed_entry;
7335 	while (next && n++ < maxscroll) {
7336 		if (last) {
7337 			s->last_displayed_entry = last;
7338 			last = got_tree_entry_get_next(s->tree, last);
7339 		}
7340 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7341 			s->first_displayed_entry = next;
7342 			next = got_tree_entry_get_next(s->tree, next);
7343 		}
7344 	}
7345 
7346 	return NULL;
7347 }
7348 
7349 static const struct got_error *
7350 tree_entry_path(char **path, struct tog_parent_trees *parents,
7351     struct got_tree_entry *te)
7352 {
7353 	const struct got_error *err = NULL;
7354 	struct tog_parent_tree *pt;
7355 	size_t len = 2; /* for leading slash and NUL */
7356 
7357 	TAILQ_FOREACH(pt, parents, entry)
7358 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7359 		    + 1 /* slash */;
7360 	if (te)
7361 		len += strlen(got_tree_entry_get_name(te));
7362 
7363 	*path = calloc(1, len);
7364 	if (path == NULL)
7365 		return got_error_from_errno("calloc");
7366 
7367 	(*path)[0] = '/';
7368 	pt = TAILQ_LAST(parents, tog_parent_trees);
7369 	while (pt) {
7370 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7371 		if (strlcat(*path, name, len) >= len) {
7372 			err = got_error(GOT_ERR_NO_SPACE);
7373 			goto done;
7374 		}
7375 		if (strlcat(*path, "/", len) >= len) {
7376 			err = got_error(GOT_ERR_NO_SPACE);
7377 			goto done;
7378 		}
7379 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7380 	}
7381 	if (te) {
7382 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7383 			err = got_error(GOT_ERR_NO_SPACE);
7384 			goto done;
7385 		}
7386 	}
7387 done:
7388 	if (err) {
7389 		free(*path);
7390 		*path = NULL;
7391 	}
7392 	return err;
7393 }
7394 
7395 static const struct got_error *
7396 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7397     struct got_tree_entry *te, struct tog_parent_trees *parents,
7398     struct got_object_id *commit_id, struct got_repository *repo)
7399 {
7400 	const struct got_error *err = NULL;
7401 	char *path;
7402 	struct tog_view *blame_view;
7403 
7404 	*new_view = NULL;
7405 
7406 	err = tree_entry_path(&path, parents, te);
7407 	if (err)
7408 		return err;
7409 
7410 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7411 	if (blame_view == NULL) {
7412 		err = got_error_from_errno("view_open");
7413 		goto done;
7414 	}
7415 
7416 	err = open_blame_view(blame_view, path, commit_id, repo);
7417 	if (err) {
7418 		if (err->code == GOT_ERR_CANCELLED)
7419 			err = NULL;
7420 		view_close(blame_view);
7421 	} else
7422 		*new_view = blame_view;
7423 done:
7424 	free(path);
7425 	return err;
7426 }
7427 
7428 static const struct got_error *
7429 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7430     struct tog_tree_view_state *s)
7431 {
7432 	struct tog_view *log_view;
7433 	const struct got_error *err = NULL;
7434 	char *path;
7435 
7436 	*new_view = NULL;
7437 
7438 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7439 	if (log_view == NULL)
7440 		return got_error_from_errno("view_open");
7441 
7442 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7443 	if (err)
7444 		return err;
7445 
7446 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7447 	    path, 0);
7448 	if (err)
7449 		view_close(log_view);
7450 	else
7451 		*new_view = log_view;
7452 	free(path);
7453 	return err;
7454 }
7455 
7456 static const struct got_error *
7457 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7458     const char *head_ref_name, struct got_repository *repo)
7459 {
7460 	const struct got_error *err = NULL;
7461 	char *commit_id_str = NULL;
7462 	struct tog_tree_view_state *s = &view->state.tree;
7463 	struct got_commit_object *commit = NULL;
7464 
7465 	TAILQ_INIT(&s->parents);
7466 	STAILQ_INIT(&s->colors);
7467 
7468 	s->commit_id = got_object_id_dup(commit_id);
7469 	if (s->commit_id == NULL) {
7470 		err = got_error_from_errno("got_object_id_dup");
7471 		goto done;
7472 	}
7473 
7474 	err = got_object_open_as_commit(&commit, repo, commit_id);
7475 	if (err)
7476 		goto done;
7477 
7478 	/*
7479 	 * The root is opened here and will be closed when the view is closed.
7480 	 * Any visited subtrees and their path-wise parents are opened and
7481 	 * closed on demand.
7482 	 */
7483 	err = got_object_open_as_tree(&s->root, repo,
7484 	    got_object_commit_get_tree_id(commit));
7485 	if (err)
7486 		goto done;
7487 	s->tree = s->root;
7488 
7489 	err = got_object_id_str(&commit_id_str, commit_id);
7490 	if (err != NULL)
7491 		goto done;
7492 
7493 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7494 		err = got_error_from_errno("asprintf");
7495 		goto done;
7496 	}
7497 
7498 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7499 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7500 	if (head_ref_name) {
7501 		s->head_ref_name = strdup(head_ref_name);
7502 		if (s->head_ref_name == NULL) {
7503 			err = got_error_from_errno("strdup");
7504 			goto done;
7505 		}
7506 	}
7507 	s->repo = repo;
7508 
7509 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7510 		err = add_color(&s->colors, "\\$$",
7511 		    TOG_COLOR_TREE_SUBMODULE,
7512 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7513 		if (err)
7514 			goto done;
7515 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7516 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7517 		if (err)
7518 			goto done;
7519 		err = add_color(&s->colors, "/$",
7520 		    TOG_COLOR_TREE_DIRECTORY,
7521 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7522 		if (err)
7523 			goto done;
7524 
7525 		err = add_color(&s->colors, "\\*$",
7526 		    TOG_COLOR_TREE_EXECUTABLE,
7527 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7528 		if (err)
7529 			goto done;
7530 
7531 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7532 		    get_color_value("TOG_COLOR_COMMIT"));
7533 		if (err)
7534 			goto done;
7535 	}
7536 
7537 	view->show = show_tree_view;
7538 	view->input = input_tree_view;
7539 	view->close = close_tree_view;
7540 	view->search_start = search_start_tree_view;
7541 	view->search_next = search_next_tree_view;
7542 done:
7543 	free(commit_id_str);
7544 	if (commit)
7545 		got_object_commit_close(commit);
7546 	if (err) {
7547 		if (view->close == NULL)
7548 			close_tree_view(view);
7549 		view_close(view);
7550 	}
7551 	return err;
7552 }
7553 
7554 static const struct got_error *
7555 close_tree_view(struct tog_view *view)
7556 {
7557 	struct tog_tree_view_state *s = &view->state.tree;
7558 
7559 	free_colors(&s->colors);
7560 	free(s->tree_label);
7561 	s->tree_label = NULL;
7562 	free(s->commit_id);
7563 	s->commit_id = NULL;
7564 	free(s->head_ref_name);
7565 	s->head_ref_name = NULL;
7566 	while (!TAILQ_EMPTY(&s->parents)) {
7567 		struct tog_parent_tree *parent;
7568 		parent = TAILQ_FIRST(&s->parents);
7569 		TAILQ_REMOVE(&s->parents, parent, entry);
7570 		if (parent->tree != s->root)
7571 			got_object_tree_close(parent->tree);
7572 		free(parent);
7573 
7574 	}
7575 	if (s->tree != NULL && s->tree != s->root)
7576 		got_object_tree_close(s->tree);
7577 	if (s->root)
7578 		got_object_tree_close(s->root);
7579 	return NULL;
7580 }
7581 
7582 static const struct got_error *
7583 search_start_tree_view(struct tog_view *view)
7584 {
7585 	struct tog_tree_view_state *s = &view->state.tree;
7586 
7587 	s->matched_entry = NULL;
7588 	return NULL;
7589 }
7590 
7591 static int
7592 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7593 {
7594 	regmatch_t regmatch;
7595 
7596 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7597 	    0) == 0;
7598 }
7599 
7600 static const struct got_error *
7601 search_next_tree_view(struct tog_view *view)
7602 {
7603 	struct tog_tree_view_state *s = &view->state.tree;
7604 	struct got_tree_entry *te = NULL;
7605 
7606 	if (!view->searching) {
7607 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7608 		return NULL;
7609 	}
7610 
7611 	if (s->matched_entry) {
7612 		if (view->searching == TOG_SEARCH_FORWARD) {
7613 			if (s->selected_entry)
7614 				te = got_tree_entry_get_next(s->tree,
7615 				    s->selected_entry);
7616 			else
7617 				te = got_object_tree_get_first_entry(s->tree);
7618 		} else {
7619 			if (s->selected_entry == NULL)
7620 				te = got_object_tree_get_last_entry(s->tree);
7621 			else
7622 				te = got_tree_entry_get_prev(s->tree,
7623 				    s->selected_entry);
7624 		}
7625 	} else {
7626 		if (s->selected_entry)
7627 			te = s->selected_entry;
7628 		else if (view->searching == TOG_SEARCH_FORWARD)
7629 			te = got_object_tree_get_first_entry(s->tree);
7630 		else
7631 			te = got_object_tree_get_last_entry(s->tree);
7632 	}
7633 
7634 	while (1) {
7635 		if (te == NULL) {
7636 			if (s->matched_entry == NULL) {
7637 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7638 				return NULL;
7639 			}
7640 			if (view->searching == TOG_SEARCH_FORWARD)
7641 				te = got_object_tree_get_first_entry(s->tree);
7642 			else
7643 				te = got_object_tree_get_last_entry(s->tree);
7644 		}
7645 
7646 		if (match_tree_entry(te, &view->regex)) {
7647 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7648 			s->matched_entry = te;
7649 			break;
7650 		}
7651 
7652 		if (view->searching == TOG_SEARCH_FORWARD)
7653 			te = got_tree_entry_get_next(s->tree, te);
7654 		else
7655 			te = got_tree_entry_get_prev(s->tree, te);
7656 	}
7657 
7658 	if (s->matched_entry) {
7659 		s->first_displayed_entry = s->matched_entry;
7660 		s->selected = 0;
7661 	}
7662 
7663 	return NULL;
7664 }
7665 
7666 static const struct got_error *
7667 show_tree_view(struct tog_view *view)
7668 {
7669 	const struct got_error *err = NULL;
7670 	struct tog_tree_view_state *s = &view->state.tree;
7671 	char *parent_path;
7672 
7673 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7674 	if (err)
7675 		return err;
7676 
7677 	err = draw_tree_entries(view, parent_path);
7678 	free(parent_path);
7679 
7680 	view_border(view);
7681 	return err;
7682 }
7683 
7684 static const struct got_error *
7685 tree_goto_line(struct tog_view *view, int nlines)
7686 {
7687 	const struct got_error		 *err = NULL;
7688 	struct tog_tree_view_state	 *s = &view->state.tree;
7689 	struct got_tree_entry		**fte, **lte, **ste;
7690 	int				  g, last, first = 1, i = 1;
7691 	int				  root = s->tree == s->root;
7692 	int				  off = root ? 1 : 2;
7693 
7694 	g = view->gline;
7695 	view->gline = 0;
7696 
7697 	if (g == 0)
7698 		g = 1;
7699 	else if (g > got_object_tree_get_nentries(s->tree))
7700 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7701 
7702 	fte = &s->first_displayed_entry;
7703 	lte = &s->last_displayed_entry;
7704 	ste = &s->selected_entry;
7705 
7706 	if (*fte != NULL) {
7707 		first = got_tree_entry_get_index(*fte);
7708 		first += off;  /* account for ".." */
7709 	}
7710 	last = got_tree_entry_get_index(*lte);
7711 	last += off;
7712 
7713 	if (g >= first && g <= last && g - first < nlines) {
7714 		s->selected = g - first;
7715 		return NULL;	/* gline is on the current page */
7716 	}
7717 
7718 	if (*ste != NULL) {
7719 		i = got_tree_entry_get_index(*ste);
7720 		i += off;
7721 	}
7722 
7723 	if (i < g) {
7724 		err = tree_scroll_down(view, g - i);
7725 		if (err)
7726 			return err;
7727 		if (got_tree_entry_get_index(*lte) >=
7728 		    got_object_tree_get_nentries(s->tree) - 1 &&
7729 		    first + s->selected < g &&
7730 		    s->selected < s->ndisplayed - 1) {
7731 			first = got_tree_entry_get_index(*fte);
7732 			first += off;
7733 			s->selected = g - first;
7734 		}
7735 	} else if (i > g)
7736 		tree_scroll_up(s, i - g);
7737 
7738 	if (g < nlines &&
7739 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7740 		s->selected = g - 1;
7741 
7742 	return NULL;
7743 }
7744 
7745 static const struct got_error *
7746 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7747 {
7748 	const struct got_error *err = NULL;
7749 	struct tog_tree_view_state *s = &view->state.tree;
7750 	struct got_tree_entry *te;
7751 	int n, nscroll = view->nlines - 3;
7752 
7753 	if (view->gline)
7754 		return tree_goto_line(view, nscroll);
7755 
7756 	switch (ch) {
7757 	case '0':
7758 	case '$':
7759 	case KEY_RIGHT:
7760 	case 'l':
7761 	case KEY_LEFT:
7762 	case 'h':
7763 		horizontal_scroll_input(view, ch);
7764 		break;
7765 	case 'i':
7766 		s->show_ids = !s->show_ids;
7767 		view->count = 0;
7768 		break;
7769 	case 'L':
7770 		view->count = 0;
7771 		if (!s->selected_entry)
7772 			break;
7773 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7774 		break;
7775 	case 'R':
7776 		view->count = 0;
7777 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7778 		break;
7779 	case 'g':
7780 	case '=':
7781 	case KEY_HOME:
7782 		s->selected = 0;
7783 		view->count = 0;
7784 		if (s->tree == s->root)
7785 			s->first_displayed_entry =
7786 			    got_object_tree_get_first_entry(s->tree);
7787 		else
7788 			s->first_displayed_entry = NULL;
7789 		break;
7790 	case 'G':
7791 	case '*':
7792 	case KEY_END: {
7793 		int eos = view->nlines - 3;
7794 
7795 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7796 			--eos;  /* border */
7797 		s->selected = 0;
7798 		view->count = 0;
7799 		te = got_object_tree_get_last_entry(s->tree);
7800 		for (n = 0; n < eos; n++) {
7801 			if (te == NULL) {
7802 				if (s->tree != s->root) {
7803 					s->first_displayed_entry = NULL;
7804 					n++;
7805 				}
7806 				break;
7807 			}
7808 			s->first_displayed_entry = te;
7809 			te = got_tree_entry_get_prev(s->tree, te);
7810 		}
7811 		if (n > 0)
7812 			s->selected = n - 1;
7813 		break;
7814 	}
7815 	case 'k':
7816 	case KEY_UP:
7817 	case CTRL('p'):
7818 		if (s->selected > 0) {
7819 			s->selected--;
7820 			break;
7821 		}
7822 		tree_scroll_up(s, 1);
7823 		if (s->selected_entry == NULL ||
7824 		    (s->tree == s->root && s->selected_entry ==
7825 		     got_object_tree_get_first_entry(s->tree)))
7826 			view->count = 0;
7827 		break;
7828 	case CTRL('u'):
7829 	case 'u':
7830 		nscroll /= 2;
7831 		/* FALL THROUGH */
7832 	case KEY_PPAGE:
7833 	case CTRL('b'):
7834 	case 'b':
7835 		if (s->tree == s->root) {
7836 			if (got_object_tree_get_first_entry(s->tree) ==
7837 			    s->first_displayed_entry)
7838 				s->selected -= MIN(s->selected, nscroll);
7839 		} else {
7840 			if (s->first_displayed_entry == NULL)
7841 				s->selected -= MIN(s->selected, nscroll);
7842 		}
7843 		tree_scroll_up(s, MAX(0, nscroll));
7844 		if (s->selected_entry == NULL ||
7845 		    (s->tree == s->root && s->selected_entry ==
7846 		     got_object_tree_get_first_entry(s->tree)))
7847 			view->count = 0;
7848 		break;
7849 	case 'j':
7850 	case KEY_DOWN:
7851 	case CTRL('n'):
7852 		if (s->selected < s->ndisplayed - 1) {
7853 			s->selected++;
7854 			break;
7855 		}
7856 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7857 		    == NULL) {
7858 			/* can't scroll any further */
7859 			view->count = 0;
7860 			break;
7861 		}
7862 		tree_scroll_down(view, 1);
7863 		break;
7864 	case CTRL('d'):
7865 	case 'd':
7866 		nscroll /= 2;
7867 		/* FALL THROUGH */
7868 	case KEY_NPAGE:
7869 	case CTRL('f'):
7870 	case 'f':
7871 	case ' ':
7872 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7873 		    == NULL) {
7874 			/* can't scroll any further; move cursor down */
7875 			if (s->selected < s->ndisplayed - 1)
7876 				s->selected += MIN(nscroll,
7877 				    s->ndisplayed - s->selected - 1);
7878 			else
7879 				view->count = 0;
7880 			break;
7881 		}
7882 		tree_scroll_down(view, nscroll);
7883 		break;
7884 	case KEY_ENTER:
7885 	case '\r':
7886 	case KEY_BACKSPACE:
7887 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7888 			struct tog_parent_tree *parent;
7889 			/* user selected '..' */
7890 			if (s->tree == s->root) {
7891 				view->count = 0;
7892 				break;
7893 			}
7894 			parent = TAILQ_FIRST(&s->parents);
7895 			TAILQ_REMOVE(&s->parents, parent,
7896 			    entry);
7897 			got_object_tree_close(s->tree);
7898 			s->tree = parent->tree;
7899 			s->first_displayed_entry =
7900 			    parent->first_displayed_entry;
7901 			s->selected_entry =
7902 			    parent->selected_entry;
7903 			s->selected = parent->selected;
7904 			if (s->selected > view->nlines - 3) {
7905 				err = offset_selection_down(view);
7906 				if (err)
7907 					break;
7908 			}
7909 			free(parent);
7910 		} else if (S_ISDIR(got_tree_entry_get_mode(
7911 		    s->selected_entry))) {
7912 			struct got_tree_object *subtree;
7913 			view->count = 0;
7914 			err = got_object_open_as_tree(&subtree, s->repo,
7915 			    got_tree_entry_get_id(s->selected_entry));
7916 			if (err)
7917 				break;
7918 			err = tree_view_visit_subtree(s, subtree);
7919 			if (err) {
7920 				got_object_tree_close(subtree);
7921 				break;
7922 			}
7923 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7924 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7925 		break;
7926 	case KEY_RESIZE:
7927 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7928 			s->selected = view->nlines - 4;
7929 		view->count = 0;
7930 		break;
7931 	default:
7932 		view->count = 0;
7933 		break;
7934 	}
7935 
7936 	return err;
7937 }
7938 
7939 __dead static void
7940 usage_tree(void)
7941 {
7942 	endwin();
7943 	fprintf(stderr,
7944 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7945 	    getprogname());
7946 	exit(1);
7947 }
7948 
7949 static const struct got_error *
7950 cmd_tree(int argc, char *argv[])
7951 {
7952 	const struct got_error *error;
7953 	struct got_repository *repo = NULL;
7954 	struct got_worktree *worktree = NULL;
7955 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7956 	struct got_object_id *commit_id = NULL;
7957 	struct got_commit_object *commit = NULL;
7958 	const char *commit_id_arg = NULL;
7959 	char *label = NULL;
7960 	struct got_reference *ref = NULL;
7961 	const char *head_ref_name = NULL;
7962 	int ch;
7963 	struct tog_view *view;
7964 	int *pack_fds = NULL;
7965 
7966 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7967 		switch (ch) {
7968 		case 'c':
7969 			commit_id_arg = optarg;
7970 			break;
7971 		case 'r':
7972 			repo_path = realpath(optarg, NULL);
7973 			if (repo_path == NULL)
7974 				return got_error_from_errno2("realpath",
7975 				    optarg);
7976 			break;
7977 		default:
7978 			usage_tree();
7979 			/* NOTREACHED */
7980 		}
7981 	}
7982 
7983 	argc -= optind;
7984 	argv += optind;
7985 
7986 	if (argc > 1)
7987 		usage_tree();
7988 
7989 	error = got_repo_pack_fds_open(&pack_fds);
7990 	if (error != NULL)
7991 		goto done;
7992 
7993 	if (repo_path == NULL) {
7994 		cwd = getcwd(NULL, 0);
7995 		if (cwd == NULL)
7996 			return got_error_from_errno("getcwd");
7997 		error = got_worktree_open(&worktree, cwd);
7998 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7999 			goto done;
8000 		if (worktree)
8001 			repo_path =
8002 			    strdup(got_worktree_get_repo_path(worktree));
8003 		else
8004 			repo_path = strdup(cwd);
8005 		if (repo_path == NULL) {
8006 			error = got_error_from_errno("strdup");
8007 			goto done;
8008 		}
8009 	}
8010 
8011 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8012 	if (error != NULL)
8013 		goto done;
8014 
8015 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8016 	    repo, worktree);
8017 	if (error)
8018 		goto done;
8019 
8020 	init_curses();
8021 
8022 	error = apply_unveil(got_repo_get_path(repo), NULL);
8023 	if (error)
8024 		goto done;
8025 
8026 	error = tog_load_refs(repo, 0);
8027 	if (error)
8028 		goto done;
8029 
8030 	if (commit_id_arg == NULL) {
8031 		error = got_repo_match_object_id(&commit_id, &label,
8032 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8033 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8034 		if (error)
8035 			goto done;
8036 		head_ref_name = label;
8037 	} else {
8038 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8039 		if (error == NULL)
8040 			head_ref_name = got_ref_get_name(ref);
8041 		else if (error->code != GOT_ERR_NOT_REF)
8042 			goto done;
8043 		error = got_repo_match_object_id(&commit_id, NULL,
8044 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8045 		if (error)
8046 			goto done;
8047 	}
8048 
8049 	error = got_object_open_as_commit(&commit, repo, commit_id);
8050 	if (error)
8051 		goto done;
8052 
8053 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8054 	if (view == NULL) {
8055 		error = got_error_from_errno("view_open");
8056 		goto done;
8057 	}
8058 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8059 	if (error)
8060 		goto done;
8061 	if (!got_path_is_root_dir(in_repo_path)) {
8062 		error = tree_view_walk_path(&view->state.tree, commit,
8063 		    in_repo_path);
8064 		if (error)
8065 			goto done;
8066 	}
8067 
8068 	if (worktree) {
8069 		/* Release work tree lock. */
8070 		got_worktree_close(worktree);
8071 		worktree = NULL;
8072 	}
8073 	error = view_loop(view);
8074 done:
8075 	free(repo_path);
8076 	free(cwd);
8077 	free(commit_id);
8078 	free(label);
8079 	if (ref)
8080 		got_ref_close(ref);
8081 	if (repo) {
8082 		const struct got_error *close_err = got_repo_close(repo);
8083 		if (error == NULL)
8084 			error = close_err;
8085 	}
8086 	if (pack_fds) {
8087 		const struct got_error *pack_err =
8088 		    got_repo_pack_fds_close(pack_fds);
8089 		if (error == NULL)
8090 			error = pack_err;
8091 	}
8092 	tog_free_refs();
8093 	return error;
8094 }
8095 
8096 static const struct got_error *
8097 ref_view_load_refs(struct tog_ref_view_state *s)
8098 {
8099 	struct got_reflist_entry *sre;
8100 	struct tog_reflist_entry *re;
8101 
8102 	s->nrefs = 0;
8103 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8104 		if (strncmp(got_ref_get_name(sre->ref),
8105 		    "refs/got/", 9) == 0 &&
8106 		    strncmp(got_ref_get_name(sre->ref),
8107 		    "refs/got/backup/", 16) != 0)
8108 			continue;
8109 
8110 		re = malloc(sizeof(*re));
8111 		if (re == NULL)
8112 			return got_error_from_errno("malloc");
8113 
8114 		re->ref = got_ref_dup(sre->ref);
8115 		if (re->ref == NULL)
8116 			return got_error_from_errno("got_ref_dup");
8117 		re->idx = s->nrefs++;
8118 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8119 	}
8120 
8121 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8122 	return NULL;
8123 }
8124 
8125 static void
8126 ref_view_free_refs(struct tog_ref_view_state *s)
8127 {
8128 	struct tog_reflist_entry *re;
8129 
8130 	while (!TAILQ_EMPTY(&s->refs)) {
8131 		re = TAILQ_FIRST(&s->refs);
8132 		TAILQ_REMOVE(&s->refs, re, entry);
8133 		got_ref_close(re->ref);
8134 		free(re);
8135 	}
8136 }
8137 
8138 static const struct got_error *
8139 open_ref_view(struct tog_view *view, struct got_repository *repo)
8140 {
8141 	const struct got_error *err = NULL;
8142 	struct tog_ref_view_state *s = &view->state.ref;
8143 
8144 	s->selected_entry = 0;
8145 	s->repo = repo;
8146 
8147 	TAILQ_INIT(&s->refs);
8148 	STAILQ_INIT(&s->colors);
8149 
8150 	err = ref_view_load_refs(s);
8151 	if (err)
8152 		goto done;
8153 
8154 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8155 		err = add_color(&s->colors, "^refs/heads/",
8156 		    TOG_COLOR_REFS_HEADS,
8157 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8158 		if (err)
8159 			goto done;
8160 
8161 		err = add_color(&s->colors, "^refs/tags/",
8162 		    TOG_COLOR_REFS_TAGS,
8163 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8164 		if (err)
8165 			goto done;
8166 
8167 		err = add_color(&s->colors, "^refs/remotes/",
8168 		    TOG_COLOR_REFS_REMOTES,
8169 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8170 		if (err)
8171 			goto done;
8172 
8173 		err = add_color(&s->colors, "^refs/got/backup/",
8174 		    TOG_COLOR_REFS_BACKUP,
8175 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8176 		if (err)
8177 			goto done;
8178 	}
8179 
8180 	view->show = show_ref_view;
8181 	view->input = input_ref_view;
8182 	view->close = close_ref_view;
8183 	view->search_start = search_start_ref_view;
8184 	view->search_next = search_next_ref_view;
8185 done:
8186 	if (err) {
8187 		if (view->close == NULL)
8188 			close_ref_view(view);
8189 		view_close(view);
8190 	}
8191 	return err;
8192 }
8193 
8194 static const struct got_error *
8195 close_ref_view(struct tog_view *view)
8196 {
8197 	struct tog_ref_view_state *s = &view->state.ref;
8198 
8199 	ref_view_free_refs(s);
8200 	free_colors(&s->colors);
8201 
8202 	return NULL;
8203 }
8204 
8205 static const struct got_error *
8206 resolve_reflist_entry(struct got_object_id **commit_id,
8207     struct tog_reflist_entry *re, struct got_repository *repo)
8208 {
8209 	const struct got_error *err = NULL;
8210 	struct got_object_id *obj_id;
8211 	struct got_tag_object *tag = NULL;
8212 	int obj_type;
8213 
8214 	*commit_id = NULL;
8215 
8216 	err = got_ref_resolve(&obj_id, repo, re->ref);
8217 	if (err)
8218 		return err;
8219 
8220 	err = got_object_get_type(&obj_type, repo, obj_id);
8221 	if (err)
8222 		goto done;
8223 
8224 	switch (obj_type) {
8225 	case GOT_OBJ_TYPE_COMMIT:
8226 		*commit_id = obj_id;
8227 		break;
8228 	case GOT_OBJ_TYPE_TAG:
8229 		err = got_object_open_as_tag(&tag, repo, obj_id);
8230 		if (err)
8231 			goto done;
8232 		free(obj_id);
8233 		err = got_object_get_type(&obj_type, repo,
8234 		    got_object_tag_get_object_id(tag));
8235 		if (err)
8236 			goto done;
8237 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8238 			err = got_error(GOT_ERR_OBJ_TYPE);
8239 			goto done;
8240 		}
8241 		*commit_id = got_object_id_dup(
8242 		    got_object_tag_get_object_id(tag));
8243 		if (*commit_id == NULL) {
8244 			err = got_error_from_errno("got_object_id_dup");
8245 			goto done;
8246 		}
8247 		break;
8248 	default:
8249 		err = got_error(GOT_ERR_OBJ_TYPE);
8250 		break;
8251 	}
8252 
8253 done:
8254 	if (tag)
8255 		got_object_tag_close(tag);
8256 	if (err) {
8257 		free(*commit_id);
8258 		*commit_id = NULL;
8259 	}
8260 	return err;
8261 }
8262 
8263 static const struct got_error *
8264 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8265     struct tog_reflist_entry *re, struct got_repository *repo)
8266 {
8267 	struct tog_view *log_view;
8268 	const struct got_error *err = NULL;
8269 	struct got_object_id *commit_id = NULL;
8270 
8271 	*new_view = NULL;
8272 
8273 	err = resolve_reflist_entry(&commit_id, re, repo);
8274 	if (err) {
8275 		if (err->code != GOT_ERR_OBJ_TYPE)
8276 			return err;
8277 		else
8278 			return NULL;
8279 	}
8280 
8281 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8282 	if (log_view == NULL) {
8283 		err = got_error_from_errno("view_open");
8284 		goto done;
8285 	}
8286 
8287 	err = open_log_view(log_view, commit_id, repo,
8288 	    got_ref_get_name(re->ref), "", 0);
8289 done:
8290 	if (err)
8291 		view_close(log_view);
8292 	else
8293 		*new_view = log_view;
8294 	free(commit_id);
8295 	return err;
8296 }
8297 
8298 static void
8299 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8300 {
8301 	struct tog_reflist_entry *re;
8302 	int i = 0;
8303 
8304 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8305 		return;
8306 
8307 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8308 	while (i++ < maxscroll) {
8309 		if (re == NULL)
8310 			break;
8311 		s->first_displayed_entry = re;
8312 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8313 	}
8314 }
8315 
8316 static const struct got_error *
8317 ref_scroll_down(struct tog_view *view, int maxscroll)
8318 {
8319 	struct tog_ref_view_state *s = &view->state.ref;
8320 	struct tog_reflist_entry *next, *last;
8321 	int n = 0;
8322 
8323 	if (s->first_displayed_entry)
8324 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8325 	else
8326 		next = TAILQ_FIRST(&s->refs);
8327 
8328 	last = s->last_displayed_entry;
8329 	while (next && n++ < maxscroll) {
8330 		if (last) {
8331 			s->last_displayed_entry = last;
8332 			last = TAILQ_NEXT(last, entry);
8333 		}
8334 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8335 			s->first_displayed_entry = next;
8336 			next = TAILQ_NEXT(next, entry);
8337 		}
8338 	}
8339 
8340 	return NULL;
8341 }
8342 
8343 static const struct got_error *
8344 search_start_ref_view(struct tog_view *view)
8345 {
8346 	struct tog_ref_view_state *s = &view->state.ref;
8347 
8348 	s->matched_entry = NULL;
8349 	return NULL;
8350 }
8351 
8352 static int
8353 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8354 {
8355 	regmatch_t regmatch;
8356 
8357 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8358 	    0) == 0;
8359 }
8360 
8361 static const struct got_error *
8362 search_next_ref_view(struct tog_view *view)
8363 {
8364 	struct tog_ref_view_state *s = &view->state.ref;
8365 	struct tog_reflist_entry *re = NULL;
8366 
8367 	if (!view->searching) {
8368 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8369 		return NULL;
8370 	}
8371 
8372 	if (s->matched_entry) {
8373 		if (view->searching == TOG_SEARCH_FORWARD) {
8374 			if (s->selected_entry)
8375 				re = TAILQ_NEXT(s->selected_entry, entry);
8376 			else
8377 				re = TAILQ_PREV(s->selected_entry,
8378 				    tog_reflist_head, entry);
8379 		} else {
8380 			if (s->selected_entry == NULL)
8381 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8382 			else
8383 				re = TAILQ_PREV(s->selected_entry,
8384 				    tog_reflist_head, entry);
8385 		}
8386 	} else {
8387 		if (s->selected_entry)
8388 			re = s->selected_entry;
8389 		else if (view->searching == TOG_SEARCH_FORWARD)
8390 			re = TAILQ_FIRST(&s->refs);
8391 		else
8392 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8393 	}
8394 
8395 	while (1) {
8396 		if (re == NULL) {
8397 			if (s->matched_entry == NULL) {
8398 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8399 				return NULL;
8400 			}
8401 			if (view->searching == TOG_SEARCH_FORWARD)
8402 				re = TAILQ_FIRST(&s->refs);
8403 			else
8404 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8405 		}
8406 
8407 		if (match_reflist_entry(re, &view->regex)) {
8408 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8409 			s->matched_entry = re;
8410 			break;
8411 		}
8412 
8413 		if (view->searching == TOG_SEARCH_FORWARD)
8414 			re = TAILQ_NEXT(re, entry);
8415 		else
8416 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8417 	}
8418 
8419 	if (s->matched_entry) {
8420 		s->first_displayed_entry = s->matched_entry;
8421 		s->selected = 0;
8422 	}
8423 
8424 	return NULL;
8425 }
8426 
8427 static const struct got_error *
8428 show_ref_view(struct tog_view *view)
8429 {
8430 	const struct got_error *err = NULL;
8431 	struct tog_ref_view_state *s = &view->state.ref;
8432 	struct tog_reflist_entry *re;
8433 	char *line = NULL;
8434 	wchar_t *wline;
8435 	struct tog_color *tc;
8436 	int width, n, scrollx;
8437 	int limit = view->nlines;
8438 
8439 	werase(view->window);
8440 
8441 	s->ndisplayed = 0;
8442 	if (view_is_hsplit_top(view))
8443 		--limit;  /* border */
8444 
8445 	if (limit == 0)
8446 		return NULL;
8447 
8448 	re = s->first_displayed_entry;
8449 
8450 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8451 	    s->nrefs) == -1)
8452 		return got_error_from_errno("asprintf");
8453 
8454 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8455 	if (err) {
8456 		free(line);
8457 		return err;
8458 	}
8459 	if (view_needs_focus_indication(view))
8460 		wstandout(view->window);
8461 	waddwstr(view->window, wline);
8462 	while (width++ < view->ncols)
8463 		waddch(view->window, ' ');
8464 	if (view_needs_focus_indication(view))
8465 		wstandend(view->window);
8466 	free(wline);
8467 	wline = NULL;
8468 	free(line);
8469 	line = NULL;
8470 	if (--limit <= 0)
8471 		return NULL;
8472 
8473 	n = 0;
8474 	view->maxx = 0;
8475 	while (re && limit > 0) {
8476 		char *line = NULL;
8477 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8478 
8479 		if (s->show_date) {
8480 			struct got_commit_object *ci;
8481 			struct got_tag_object *tag;
8482 			struct got_object_id *id;
8483 			struct tm tm;
8484 			time_t t;
8485 
8486 			err = got_ref_resolve(&id, s->repo, re->ref);
8487 			if (err)
8488 				return err;
8489 			err = got_object_open_as_tag(&tag, s->repo, id);
8490 			if (err) {
8491 				if (err->code != GOT_ERR_OBJ_TYPE) {
8492 					free(id);
8493 					return err;
8494 				}
8495 				err = got_object_open_as_commit(&ci, s->repo,
8496 				    id);
8497 				if (err) {
8498 					free(id);
8499 					return err;
8500 				}
8501 				t = got_object_commit_get_committer_time(ci);
8502 				got_object_commit_close(ci);
8503 			} else {
8504 				t = got_object_tag_get_tagger_time(tag);
8505 				got_object_tag_close(tag);
8506 			}
8507 			free(id);
8508 			if (gmtime_r(&t, &tm) == NULL)
8509 				return got_error_from_errno("gmtime_r");
8510 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8511 				return got_error(GOT_ERR_NO_SPACE);
8512 		}
8513 		if (got_ref_is_symbolic(re->ref)) {
8514 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8515 			    ymd : "", got_ref_get_name(re->ref),
8516 			    got_ref_get_symref_target(re->ref)) == -1)
8517 				return got_error_from_errno("asprintf");
8518 		} else if (s->show_ids) {
8519 			struct got_object_id *id;
8520 			char *id_str;
8521 			err = got_ref_resolve(&id, s->repo, re->ref);
8522 			if (err)
8523 				return err;
8524 			err = got_object_id_str(&id_str, id);
8525 			if (err) {
8526 				free(id);
8527 				return err;
8528 			}
8529 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8530 			    got_ref_get_name(re->ref), id_str) == -1) {
8531 				err = got_error_from_errno("asprintf");
8532 				free(id);
8533 				free(id_str);
8534 				return err;
8535 			}
8536 			free(id);
8537 			free(id_str);
8538 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8539 		    got_ref_get_name(re->ref)) == -1)
8540 			return got_error_from_errno("asprintf");
8541 
8542 		/* use full line width to determine view->maxx */
8543 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8544 		if (err) {
8545 			free(line);
8546 			return err;
8547 		}
8548 		view->maxx = MAX(view->maxx, width);
8549 		free(wline);
8550 		wline = NULL;
8551 
8552 		err = format_line(&wline, &width, &scrollx, line, view->x,
8553 		    view->ncols, 0, 0);
8554 		if (err) {
8555 			free(line);
8556 			return err;
8557 		}
8558 		if (n == s->selected) {
8559 			if (view->focussed)
8560 				wstandout(view->window);
8561 			s->selected_entry = re;
8562 		}
8563 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8564 		if (tc)
8565 			wattr_on(view->window,
8566 			    COLOR_PAIR(tc->colorpair), NULL);
8567 		waddwstr(view->window, &wline[scrollx]);
8568 		if (tc)
8569 			wattr_off(view->window,
8570 			    COLOR_PAIR(tc->colorpair), NULL);
8571 		if (width < view->ncols)
8572 			waddch(view->window, '\n');
8573 		if (n == s->selected && view->focussed)
8574 			wstandend(view->window);
8575 		free(line);
8576 		free(wline);
8577 		wline = NULL;
8578 		n++;
8579 		s->ndisplayed++;
8580 		s->last_displayed_entry = re;
8581 
8582 		limit--;
8583 		re = TAILQ_NEXT(re, entry);
8584 	}
8585 
8586 	view_border(view);
8587 	return err;
8588 }
8589 
8590 static const struct got_error *
8591 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8592     struct tog_reflist_entry *re, struct got_repository *repo)
8593 {
8594 	const struct got_error *err = NULL;
8595 	struct got_object_id *commit_id = NULL;
8596 	struct tog_view *tree_view;
8597 
8598 	*new_view = NULL;
8599 
8600 	err = resolve_reflist_entry(&commit_id, re, repo);
8601 	if (err) {
8602 		if (err->code != GOT_ERR_OBJ_TYPE)
8603 			return err;
8604 		else
8605 			return NULL;
8606 	}
8607 
8608 
8609 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8610 	if (tree_view == NULL) {
8611 		err = got_error_from_errno("view_open");
8612 		goto done;
8613 	}
8614 
8615 	err = open_tree_view(tree_view, commit_id,
8616 	    got_ref_get_name(re->ref), repo);
8617 	if (err)
8618 		goto done;
8619 
8620 	*new_view = tree_view;
8621 done:
8622 	free(commit_id);
8623 	return err;
8624 }
8625 
8626 static const struct got_error *
8627 ref_goto_line(struct tog_view *view, int nlines)
8628 {
8629 	const struct got_error		*err = NULL;
8630 	struct tog_ref_view_state	*s = &view->state.ref;
8631 	int				 g, idx = s->selected_entry->idx;
8632 
8633 	g = view->gline;
8634 	view->gline = 0;
8635 
8636 	if (g == 0)
8637 		g = 1;
8638 	else if (g > s->nrefs)
8639 		g = s->nrefs;
8640 
8641 	if (g >= s->first_displayed_entry->idx + 1 &&
8642 	    g <= s->last_displayed_entry->idx + 1 &&
8643 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8644 		s->selected = g - s->first_displayed_entry->idx - 1;
8645 		return NULL;
8646 	}
8647 
8648 	if (idx + 1 < g) {
8649 		err = ref_scroll_down(view, g - idx - 1);
8650 		if (err)
8651 			return err;
8652 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8653 		    s->first_displayed_entry->idx + s->selected < g &&
8654 		    s->selected < s->ndisplayed - 1)
8655 			s->selected = g - s->first_displayed_entry->idx - 1;
8656 	} else if (idx + 1 > g)
8657 		ref_scroll_up(s, idx - g + 1);
8658 
8659 	if (g < nlines && s->first_displayed_entry->idx == 0)
8660 		s->selected = g - 1;
8661 
8662 	return NULL;
8663 
8664 }
8665 
8666 static const struct got_error *
8667 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8668 {
8669 	const struct got_error *err = NULL;
8670 	struct tog_ref_view_state *s = &view->state.ref;
8671 	struct tog_reflist_entry *re;
8672 	int n, nscroll = view->nlines - 1;
8673 
8674 	if (view->gline)
8675 		return ref_goto_line(view, nscroll);
8676 
8677 	switch (ch) {
8678 	case '0':
8679 	case '$':
8680 	case KEY_RIGHT:
8681 	case 'l':
8682 	case KEY_LEFT:
8683 	case 'h':
8684 		horizontal_scroll_input(view, ch);
8685 		break;
8686 	case 'i':
8687 		s->show_ids = !s->show_ids;
8688 		view->count = 0;
8689 		break;
8690 	case 'm':
8691 		s->show_date = !s->show_date;
8692 		view->count = 0;
8693 		break;
8694 	case 'o':
8695 		s->sort_by_date = !s->sort_by_date;
8696 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8697 		view->count = 0;
8698 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8699 		    got_ref_cmp_by_commit_timestamp_descending :
8700 		    tog_ref_cmp_by_name, s->repo);
8701 		if (err)
8702 			break;
8703 		got_reflist_object_id_map_free(tog_refs_idmap);
8704 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8705 		    &tog_refs, s->repo);
8706 		if (err)
8707 			break;
8708 		ref_view_free_refs(s);
8709 		err = ref_view_load_refs(s);
8710 		break;
8711 	case KEY_ENTER:
8712 	case '\r':
8713 		view->count = 0;
8714 		if (!s->selected_entry)
8715 			break;
8716 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8717 		break;
8718 	case 'T':
8719 		view->count = 0;
8720 		if (!s->selected_entry)
8721 			break;
8722 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8723 		break;
8724 	case 'g':
8725 	case '=':
8726 	case KEY_HOME:
8727 		s->selected = 0;
8728 		view->count = 0;
8729 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8730 		break;
8731 	case 'G':
8732 	case '*':
8733 	case KEY_END: {
8734 		int eos = view->nlines - 1;
8735 
8736 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8737 			--eos;  /* border */
8738 		s->selected = 0;
8739 		view->count = 0;
8740 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8741 		for (n = 0; n < eos; n++) {
8742 			if (re == NULL)
8743 				break;
8744 			s->first_displayed_entry = re;
8745 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8746 		}
8747 		if (n > 0)
8748 			s->selected = n - 1;
8749 		break;
8750 	}
8751 	case 'k':
8752 	case KEY_UP:
8753 	case CTRL('p'):
8754 		if (s->selected > 0) {
8755 			s->selected--;
8756 			break;
8757 		}
8758 		ref_scroll_up(s, 1);
8759 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8760 			view->count = 0;
8761 		break;
8762 	case CTRL('u'):
8763 	case 'u':
8764 		nscroll /= 2;
8765 		/* FALL THROUGH */
8766 	case KEY_PPAGE:
8767 	case CTRL('b'):
8768 	case 'b':
8769 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8770 			s->selected -= MIN(nscroll, s->selected);
8771 		ref_scroll_up(s, MAX(0, nscroll));
8772 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8773 			view->count = 0;
8774 		break;
8775 	case 'j':
8776 	case KEY_DOWN:
8777 	case CTRL('n'):
8778 		if (s->selected < s->ndisplayed - 1) {
8779 			s->selected++;
8780 			break;
8781 		}
8782 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8783 			/* can't scroll any further */
8784 			view->count = 0;
8785 			break;
8786 		}
8787 		ref_scroll_down(view, 1);
8788 		break;
8789 	case CTRL('d'):
8790 	case 'd':
8791 		nscroll /= 2;
8792 		/* FALL THROUGH */
8793 	case KEY_NPAGE:
8794 	case CTRL('f'):
8795 	case 'f':
8796 	case ' ':
8797 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8798 			/* can't scroll any further; move cursor down */
8799 			if (s->selected < s->ndisplayed - 1)
8800 				s->selected += MIN(nscroll,
8801 				    s->ndisplayed - s->selected - 1);
8802 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8803 				s->selected += s->ndisplayed - s->selected - 1;
8804 			view->count = 0;
8805 			break;
8806 		}
8807 		ref_scroll_down(view, nscroll);
8808 		break;
8809 	case CTRL('l'):
8810 		view->count = 0;
8811 		tog_free_refs();
8812 		err = tog_load_refs(s->repo, s->sort_by_date);
8813 		if (err)
8814 			break;
8815 		ref_view_free_refs(s);
8816 		err = ref_view_load_refs(s);
8817 		break;
8818 	case KEY_RESIZE:
8819 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8820 			s->selected = view->nlines - 2;
8821 		break;
8822 	default:
8823 		view->count = 0;
8824 		break;
8825 	}
8826 
8827 	return err;
8828 }
8829 
8830 __dead static void
8831 usage_ref(void)
8832 {
8833 	endwin();
8834 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8835 	    getprogname());
8836 	exit(1);
8837 }
8838 
8839 static const struct got_error *
8840 cmd_ref(int argc, char *argv[])
8841 {
8842 	const struct got_error *error;
8843 	struct got_repository *repo = NULL;
8844 	struct got_worktree *worktree = NULL;
8845 	char *cwd = NULL, *repo_path = NULL;
8846 	int ch;
8847 	struct tog_view *view;
8848 	int *pack_fds = NULL;
8849 
8850 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8851 		switch (ch) {
8852 		case 'r':
8853 			repo_path = realpath(optarg, NULL);
8854 			if (repo_path == NULL)
8855 				return got_error_from_errno2("realpath",
8856 				    optarg);
8857 			break;
8858 		default:
8859 			usage_ref();
8860 			/* NOTREACHED */
8861 		}
8862 	}
8863 
8864 	argc -= optind;
8865 	argv += optind;
8866 
8867 	if (argc > 1)
8868 		usage_ref();
8869 
8870 	error = got_repo_pack_fds_open(&pack_fds);
8871 	if (error != NULL)
8872 		goto done;
8873 
8874 	if (repo_path == NULL) {
8875 		cwd = getcwd(NULL, 0);
8876 		if (cwd == NULL)
8877 			return got_error_from_errno("getcwd");
8878 		error = got_worktree_open(&worktree, cwd);
8879 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8880 			goto done;
8881 		if (worktree)
8882 			repo_path =
8883 			    strdup(got_worktree_get_repo_path(worktree));
8884 		else
8885 			repo_path = strdup(cwd);
8886 		if (repo_path == NULL) {
8887 			error = got_error_from_errno("strdup");
8888 			goto done;
8889 		}
8890 	}
8891 
8892 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8893 	if (error != NULL)
8894 		goto done;
8895 
8896 	init_curses();
8897 
8898 	error = apply_unveil(got_repo_get_path(repo), NULL);
8899 	if (error)
8900 		goto done;
8901 
8902 	error = tog_load_refs(repo, 0);
8903 	if (error)
8904 		goto done;
8905 
8906 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8907 	if (view == NULL) {
8908 		error = got_error_from_errno("view_open");
8909 		goto done;
8910 	}
8911 
8912 	error = open_ref_view(view, repo);
8913 	if (error)
8914 		goto done;
8915 
8916 	if (worktree) {
8917 		/* Release work tree lock. */
8918 		got_worktree_close(worktree);
8919 		worktree = NULL;
8920 	}
8921 	error = view_loop(view);
8922 done:
8923 	free(repo_path);
8924 	free(cwd);
8925 	if (repo) {
8926 		const struct got_error *close_err = got_repo_close(repo);
8927 		if (close_err)
8928 			error = close_err;
8929 	}
8930 	if (pack_fds) {
8931 		const struct got_error *pack_err =
8932 		    got_repo_pack_fds_close(pack_fds);
8933 		if (error == NULL)
8934 			error = pack_err;
8935 	}
8936 	tog_free_refs();
8937 	return error;
8938 }
8939 
8940 static const struct got_error*
8941 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
8942     const char *str)
8943 {
8944 	size_t len;
8945 
8946 	if (win == NULL)
8947 		win = stdscr;
8948 
8949 	len = strlen(str);
8950 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
8951 
8952 	if (focus)
8953 		wstandout(win);
8954 	if (mvwprintw(win, y, x, "%s", str) == ERR)
8955 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
8956 	if (focus)
8957 		wstandend(win);
8958 
8959 	return NULL;
8960 }
8961 
8962 static const struct got_error *
8963 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
8964 {
8965 	off_t *p;
8966 
8967 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
8968 	if (p == NULL) {
8969 		free(*line_offsets);
8970 		*line_offsets = NULL;
8971 		return got_error_from_errno("reallocarray");
8972 	}
8973 
8974 	*line_offsets = p;
8975 	(*line_offsets)[*nlines] = off;
8976 	++(*nlines);
8977 	return NULL;
8978 }
8979 
8980 static const struct got_error *
8981 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
8982 {
8983 	*ret = 0;
8984 
8985 	for (;n > 0; --n, ++km) {
8986 		char	*t0, *t, *k;
8987 		size_t	 len = 1;
8988 
8989 		if (km->keys == NULL)
8990 			continue;
8991 
8992 		t = t0 = strdup(km->keys);
8993 		if (t0 == NULL)
8994 			return got_error_from_errno("strdup");
8995 
8996 		len += strlen(t);
8997 		while ((k = strsep(&t, " ")) != NULL)
8998 			len += strlen(k) > 1 ? 2 : 0;
8999 		free(t0);
9000 		*ret = MAX(*ret, len);
9001 	}
9002 
9003 	return NULL;
9004 }
9005 
9006 /*
9007  * Write keymap section headers, keys, and key info in km to f.
9008  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9009  * wrap control and symbolic keys in guillemets, else use <>.
9010  */
9011 static const struct got_error *
9012 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9013 {
9014 	int n, len = width;
9015 
9016 	if (km->keys) {
9017 		static const char *u8_glyph[] = {
9018 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9019 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9020 		};
9021 		char	*t0, *t, *k;
9022 		int	 cs, s, first = 1;
9023 
9024 		cs = got_locale_is_utf8();
9025 
9026 		t = t0 = strdup(km->keys);
9027 		if (t0 == NULL)
9028 			return got_error_from_errno("strdup");
9029 
9030 		len = strlen(km->keys);
9031 		while ((k = strsep(&t, " ")) != NULL) {
9032 			s = strlen(k) > 1;  /* control or symbolic key */
9033 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9034 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9035 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9036 			if (n < 0) {
9037 				free(t0);
9038 				return got_error_from_errno("fprintf");
9039 			}
9040 			first = 0;
9041 			len += s ? 2 : 0;
9042 			*off += n;
9043 		}
9044 		free(t0);
9045 	}
9046 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9047 	if (n < 0)
9048 		return got_error_from_errno("fprintf");
9049 	*off += n;
9050 
9051 	return NULL;
9052 }
9053 
9054 static const struct got_error *
9055 format_help(struct tog_help_view_state *s)
9056 {
9057 	const struct got_error		*err = NULL;
9058 	off_t				 off = 0;
9059 	int				 i, max, n, show = s->all;
9060 	static const struct tog_key_map	 km[] = {
9061 #define KEYMAP_(info, type)	{ NULL, (info), type }
9062 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9063 		GENERATE_HELP
9064 #undef KEYMAP_
9065 #undef KEY_
9066 	};
9067 
9068 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9069 	if (err)
9070 		return err;
9071 
9072 	n = nitems(km);
9073 	err = max_key_str(&max, km, n);
9074 	if (err)
9075 		return err;
9076 
9077 	for (i = 0; i < n; ++i) {
9078 		if (km[i].keys == NULL) {
9079 			show = s->all;
9080 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9081 			    km[i].type == s->type || s->all)
9082 				show = 1;
9083 		}
9084 		if (show) {
9085 			err = format_help_line(&off, s->f, &km[i], max);
9086 			if (err)
9087 				return err;
9088 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9089 			if (err)
9090 				return err;
9091 		}
9092 	}
9093 	fputc('\n', s->f);
9094 	++off;
9095 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9096 	return err;
9097 }
9098 
9099 static const struct got_error *
9100 create_help(struct tog_help_view_state *s)
9101 {
9102 	FILE			*f;
9103 	const struct got_error	*err;
9104 
9105 	free(s->line_offsets);
9106 	s->line_offsets = NULL;
9107 	s->nlines = 0;
9108 
9109 	f = got_opentemp();
9110 	if (f == NULL)
9111 		return got_error_from_errno("got_opentemp");
9112 	s->f = f;
9113 
9114 	err = format_help(s);
9115 	if (err)
9116 		return err;
9117 
9118 	if (s->f && fflush(s->f) != 0)
9119 		return got_error_from_errno("fflush");
9120 
9121 	return NULL;
9122 }
9123 
9124 static const struct got_error *
9125 search_start_help_view(struct tog_view *view)
9126 {
9127 	view->state.help.matched_line = 0;
9128 	return NULL;
9129 }
9130 
9131 static void
9132 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9133     size_t *nlines, int **first, int **last, int **match, int **selected)
9134 {
9135 	struct tog_help_view_state *s = &view->state.help;
9136 
9137 	*f = s->f;
9138 	*nlines = s->nlines;
9139 	*line_offsets = s->line_offsets;
9140 	*match = &s->matched_line;
9141 	*first = &s->first_displayed_line;
9142 	*last = &s->last_displayed_line;
9143 	*selected = &s->selected_line;
9144 }
9145 
9146 static const struct got_error *
9147 show_help_view(struct tog_view *view)
9148 {
9149 	struct tog_help_view_state	*s = &view->state.help;
9150 	const struct got_error		*err;
9151 	regmatch_t			*regmatch = &view->regmatch;
9152 	wchar_t				*wline;
9153 	char				*line;
9154 	ssize_t				 linelen;
9155 	size_t				 linesz = 0;
9156 	int				 width, nprinted = 0, rc = 0;
9157 	int				 eos = view->nlines;
9158 
9159 	if (view_is_hsplit_top(view))
9160 		--eos;  /* account for border */
9161 
9162 	s->lineno = 0;
9163 	rewind(s->f);
9164 	werase(view->window);
9165 
9166 	if (view->gline > s->nlines - 1)
9167 		view->gline = s->nlines - 1;
9168 
9169 	err = win_draw_center(view->window, 0, 0, view->ncols,
9170 	    view_needs_focus_indication(view),
9171 	    "tog help (press q to return to tog)");
9172 	if (err)
9173 		return err;
9174 	if (eos <= 1)
9175 		return NULL;
9176 	waddstr(view->window, "\n\n");
9177 	eos -= 2;
9178 
9179 	s->eof = 0;
9180 	view->maxx = 0;
9181 	line = NULL;
9182 	while (eos > 0 && nprinted < eos) {
9183 		attr_t attr = 0;
9184 
9185 		linelen = getline(&line, &linesz, s->f);
9186 		if (linelen == -1) {
9187 			if (!feof(s->f)) {
9188 				free(line);
9189 				return got_ferror(s->f, GOT_ERR_IO);
9190 			}
9191 			s->eof = 1;
9192 			break;
9193 		}
9194 		if (++s->lineno < s->first_displayed_line)
9195 			continue;
9196 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9197 			continue;
9198 		if (s->lineno == view->hiline)
9199 			attr = A_STANDOUT;
9200 
9201 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9202 		    view->x ? 1 : 0);
9203 		if (err) {
9204 			free(line);
9205 			return err;
9206 		}
9207 		view->maxx = MAX(view->maxx, width);
9208 		free(wline);
9209 		wline = NULL;
9210 
9211 		if (attr)
9212 			wattron(view->window, attr);
9213 		if (s->first_displayed_line + nprinted == s->matched_line &&
9214 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9215 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9216 			    view->window, view->x, regmatch);
9217 			if (err) {
9218 				free(line);
9219 				return err;
9220 			}
9221 		} else {
9222 			int skip;
9223 
9224 			err = format_line(&wline, &width, &skip, line,
9225 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9226 			if (err) {
9227 				free(line);
9228 				return err;
9229 			}
9230 			waddwstr(view->window, &wline[skip]);
9231 			free(wline);
9232 			wline = NULL;
9233 		}
9234 		if (s->lineno == view->hiline) {
9235 			while (width++ < view->ncols)
9236 				waddch(view->window, ' ');
9237 		} else {
9238 			if (width < view->ncols)
9239 				waddch(view->window, '\n');
9240 		}
9241 		if (attr)
9242 			wattroff(view->window, attr);
9243 		if (++nprinted == 1)
9244 			s->first_displayed_line = s->lineno;
9245 	}
9246 	free(line);
9247 	if (nprinted > 0)
9248 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9249 	else
9250 		s->last_displayed_line = s->first_displayed_line;
9251 
9252 	view_border(view);
9253 
9254 	if (s->eof) {
9255 		rc = waddnstr(view->window,
9256 		    "See the tog(1) manual page for full documentation",
9257 		    view->ncols - 1);
9258 		if (rc == ERR)
9259 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9260 	} else {
9261 		wmove(view->window, view->nlines - 1, 0);
9262 		wclrtoeol(view->window);
9263 		wstandout(view->window);
9264 		rc = waddnstr(view->window, "scroll down for more...",
9265 		    view->ncols - 1);
9266 		if (rc == ERR)
9267 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9268 		if (getcurx(view->window) < view->ncols - 6) {
9269 			rc = wprintw(view->window, "[%.0f%%]",
9270 			    100.00 * s->last_displayed_line / s->nlines);
9271 			if (rc == ERR)
9272 				return got_error_msg(GOT_ERR_IO, "wprintw");
9273 		}
9274 		wstandend(view->window);
9275 	}
9276 
9277 	return NULL;
9278 }
9279 
9280 static const struct got_error *
9281 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9282 {
9283 	struct tog_help_view_state	*s = &view->state.help;
9284 	const struct got_error		*err = NULL;
9285 	char				*line = NULL;
9286 	ssize_t				 linelen;
9287 	size_t				 linesz = 0;
9288 	int				 eos, nscroll;
9289 
9290 	eos = nscroll = view->nlines;
9291 	if (view_is_hsplit_top(view))
9292 		--eos;  /* border */
9293 
9294 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9295 
9296 	switch (ch) {
9297 	case '0':
9298 	case '$':
9299 	case KEY_RIGHT:
9300 	case 'l':
9301 	case KEY_LEFT:
9302 	case 'h':
9303 		horizontal_scroll_input(view, ch);
9304 		break;
9305 	case 'g':
9306 	case KEY_HOME:
9307 		s->first_displayed_line = 1;
9308 		view->count = 0;
9309 		break;
9310 	case 'G':
9311 	case KEY_END:
9312 		view->count = 0;
9313 		if (s->eof)
9314 			break;
9315 		s->first_displayed_line = (s->nlines - eos) + 3;
9316 		s->eof = 1;
9317 		break;
9318 	case 'k':
9319 	case KEY_UP:
9320 		if (s->first_displayed_line > 1)
9321 			--s->first_displayed_line;
9322 		else
9323 			view->count = 0;
9324 		break;
9325 	case CTRL('u'):
9326 	case 'u':
9327 		nscroll /= 2;
9328 		/* FALL THROUGH */
9329 	case KEY_PPAGE:
9330 	case CTRL('b'):
9331 	case 'b':
9332 		if (s->first_displayed_line == 1) {
9333 			view->count = 0;
9334 			break;
9335 		}
9336 		while (--nscroll > 0 && s->first_displayed_line > 1)
9337 			s->first_displayed_line--;
9338 		break;
9339 	case 'j':
9340 	case KEY_DOWN:
9341 	case CTRL('n'):
9342 		if (!s->eof)
9343 			++s->first_displayed_line;
9344 		else
9345 			view->count = 0;
9346 		break;
9347 	case CTRL('d'):
9348 	case 'd':
9349 		nscroll /= 2;
9350 		/* FALL THROUGH */
9351 	case KEY_NPAGE:
9352 	case CTRL('f'):
9353 	case 'f':
9354 	case ' ':
9355 		if (s->eof) {
9356 			view->count = 0;
9357 			break;
9358 		}
9359 		while (!s->eof && --nscroll > 0) {
9360 			linelen = getline(&line, &linesz, s->f);
9361 			s->first_displayed_line++;
9362 			if (linelen == -1) {
9363 				if (feof(s->f))
9364 					s->eof = 1;
9365 				else
9366 					err = got_ferror(s->f, GOT_ERR_IO);
9367 				break;
9368 			}
9369 		}
9370 		free(line);
9371 		break;
9372 	default:
9373 		view->count = 0;
9374 		break;
9375 	}
9376 
9377 	return err;
9378 }
9379 
9380 static const struct got_error *
9381 close_help_view(struct tog_view *view)
9382 {
9383 	struct tog_help_view_state *s = &view->state.help;
9384 
9385 	free(s->line_offsets);
9386 	s->line_offsets = NULL;
9387 	if (fclose(s->f) == EOF)
9388 		return got_error_from_errno("fclose");
9389 
9390 	return NULL;
9391 }
9392 
9393 static const struct got_error *
9394 reset_help_view(struct tog_view *view)
9395 {
9396 	struct tog_help_view_state *s = &view->state.help;
9397 
9398 
9399 	if (s->f && fclose(s->f) == EOF)
9400 		return got_error_from_errno("fclose");
9401 
9402 	wclear(view->window);
9403 	view->count = 0;
9404 	view->x = 0;
9405 	s->all = !s->all;
9406 	s->first_displayed_line = 1;
9407 	s->last_displayed_line = view->nlines;
9408 	s->matched_line = 0;
9409 
9410 	return create_help(s);
9411 }
9412 
9413 static const struct got_error *
9414 open_help_view(struct tog_view *view, struct tog_view *parent)
9415 {
9416 	const struct got_error		*err = NULL;
9417 	struct tog_help_view_state	*s = &view->state.help;
9418 
9419 	s->type = (enum tog_keymap_type)parent->type;
9420 	s->first_displayed_line = 1;
9421 	s->last_displayed_line = view->nlines;
9422 	s->selected_line = 1;
9423 
9424 	view->show = show_help_view;
9425 	view->input = input_help_view;
9426 	view->reset = reset_help_view;
9427 	view->close = close_help_view;
9428 	view->search_start = search_start_help_view;
9429 	view->search_setup = search_setup_help_view;
9430 	view->search_next = search_next_view_match;
9431 
9432 	err = create_help(s);
9433 	return err;
9434 }
9435 
9436 static const struct got_error *
9437 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9438     enum tog_view_type request, int y, int x)
9439 {
9440 	const struct got_error *err = NULL;
9441 
9442 	*new_view = NULL;
9443 
9444 	switch (request) {
9445 	case TOG_VIEW_DIFF:
9446 		if (view->type == TOG_VIEW_LOG) {
9447 			struct tog_log_view_state *s = &view->state.log;
9448 
9449 			err = open_diff_view_for_commit(new_view, y, x,
9450 			    s->selected_entry->commit, s->selected_entry->id,
9451 			    view, s->repo);
9452 		} else
9453 			return got_error_msg(GOT_ERR_NOT_IMPL,
9454 			    "parent/child view pair not supported");
9455 		break;
9456 	case TOG_VIEW_BLAME:
9457 		if (view->type == TOG_VIEW_TREE) {
9458 			struct tog_tree_view_state *s = &view->state.tree;
9459 
9460 			err = blame_tree_entry(new_view, y, x,
9461 			    s->selected_entry, &s->parents, s->commit_id,
9462 			    s->repo);
9463 		} else
9464 			return got_error_msg(GOT_ERR_NOT_IMPL,
9465 			    "parent/child view pair not supported");
9466 		break;
9467 	case TOG_VIEW_LOG:
9468 		if (view->type == TOG_VIEW_BLAME)
9469 			err = log_annotated_line(new_view, y, x,
9470 			    view->state.blame.repo, view->state.blame.id_to_log);
9471 		else if (view->type == TOG_VIEW_TREE)
9472 			err = log_selected_tree_entry(new_view, y, x,
9473 			    &view->state.tree);
9474 		else if (view->type == TOG_VIEW_REF)
9475 			err = log_ref_entry(new_view, y, x,
9476 			    view->state.ref.selected_entry,
9477 			    view->state.ref.repo);
9478 		else
9479 			return got_error_msg(GOT_ERR_NOT_IMPL,
9480 			    "parent/child view pair not supported");
9481 		break;
9482 	case TOG_VIEW_TREE:
9483 		if (view->type == TOG_VIEW_LOG)
9484 			err = browse_commit_tree(new_view, y, x,
9485 			    view->state.log.selected_entry,
9486 			    view->state.log.in_repo_path,
9487 			    view->state.log.head_ref_name,
9488 			    view->state.log.repo);
9489 		else if (view->type == TOG_VIEW_REF)
9490 			err = browse_ref_tree(new_view, y, x,
9491 			    view->state.ref.selected_entry,
9492 			    view->state.ref.repo);
9493 		else
9494 			return got_error_msg(GOT_ERR_NOT_IMPL,
9495 			    "parent/child view pair not supported");
9496 		break;
9497 	case TOG_VIEW_REF:
9498 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9499 		if (*new_view == NULL)
9500 			return got_error_from_errno("view_open");
9501 		if (view->type == TOG_VIEW_LOG)
9502 			err = open_ref_view(*new_view, view->state.log.repo);
9503 		else if (view->type == TOG_VIEW_TREE)
9504 			err = open_ref_view(*new_view, view->state.tree.repo);
9505 		else
9506 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9507 			    "parent/child view pair not supported");
9508 		if (err)
9509 			view_close(*new_view);
9510 		break;
9511 	case TOG_VIEW_HELP:
9512 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9513 		if (*new_view == NULL)
9514 			return got_error_from_errno("view_open");
9515 		err = open_help_view(*new_view, view);
9516 		if (err)
9517 			view_close(*new_view);
9518 		break;
9519 	default:
9520 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9521 	}
9522 
9523 	return err;
9524 }
9525 
9526 /*
9527  * If view was scrolled down to move the selected line into view when opening a
9528  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9529  */
9530 static void
9531 offset_selection_up(struct tog_view *view)
9532 {
9533 	switch (view->type) {
9534 	case TOG_VIEW_BLAME: {
9535 		struct tog_blame_view_state *s = &view->state.blame;
9536 		if (s->first_displayed_line == 1) {
9537 			s->selected_line = MAX(s->selected_line - view->offset,
9538 			    1);
9539 			break;
9540 		}
9541 		if (s->first_displayed_line > view->offset)
9542 			s->first_displayed_line -= view->offset;
9543 		else
9544 			s->first_displayed_line = 1;
9545 		s->selected_line += view->offset;
9546 		break;
9547 	}
9548 	case TOG_VIEW_LOG:
9549 		log_scroll_up(&view->state.log, view->offset);
9550 		view->state.log.selected += view->offset;
9551 		break;
9552 	case TOG_VIEW_REF:
9553 		ref_scroll_up(&view->state.ref, view->offset);
9554 		view->state.ref.selected += view->offset;
9555 		break;
9556 	case TOG_VIEW_TREE:
9557 		tree_scroll_up(&view->state.tree, view->offset);
9558 		view->state.tree.selected += view->offset;
9559 		break;
9560 	default:
9561 		break;
9562 	}
9563 
9564 	view->offset = 0;
9565 }
9566 
9567 /*
9568  * If the selected line is in the section of screen covered by the bottom split,
9569  * scroll down offset lines to move it into view and index its new position.
9570  */
9571 static const struct got_error *
9572 offset_selection_down(struct tog_view *view)
9573 {
9574 	const struct got_error	*err = NULL;
9575 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9576 	int			*selected = NULL;
9577 	int			 header, offset;
9578 
9579 	switch (view->type) {
9580 	case TOG_VIEW_BLAME: {
9581 		struct tog_blame_view_state *s = &view->state.blame;
9582 		header = 3;
9583 		scrolld = NULL;
9584 		if (s->selected_line > view->nlines - header) {
9585 			offset = abs(view->nlines - s->selected_line - header);
9586 			s->first_displayed_line += offset;
9587 			s->selected_line -= offset;
9588 			view->offset = offset;
9589 		}
9590 		break;
9591 	}
9592 	case TOG_VIEW_LOG: {
9593 		struct tog_log_view_state *s = &view->state.log;
9594 		scrolld = &log_scroll_down;
9595 		header = view_is_parent_view(view) ? 3 : 2;
9596 		selected = &s->selected;
9597 		break;
9598 	}
9599 	case TOG_VIEW_REF: {
9600 		struct tog_ref_view_state *s = &view->state.ref;
9601 		scrolld = &ref_scroll_down;
9602 		header = 3;
9603 		selected = &s->selected;
9604 		break;
9605 	}
9606 	case TOG_VIEW_TREE: {
9607 		struct tog_tree_view_state *s = &view->state.tree;
9608 		scrolld = &tree_scroll_down;
9609 		header = 5;
9610 		selected = &s->selected;
9611 		break;
9612 	}
9613 	default:
9614 		selected = NULL;
9615 		scrolld = NULL;
9616 		header = 0;
9617 		break;
9618 	}
9619 
9620 	if (selected && *selected > view->nlines - header) {
9621 		offset = abs(view->nlines - *selected - header);
9622 		view->offset = offset;
9623 		if (scrolld && offset) {
9624 			err = scrolld(view, offset);
9625 			*selected -= offset;
9626 		}
9627 	}
9628 
9629 	return err;
9630 }
9631 
9632 static void
9633 list_commands(FILE *fp)
9634 {
9635 	size_t i;
9636 
9637 	fprintf(fp, "commands:");
9638 	for (i = 0; i < nitems(tog_commands); i++) {
9639 		const struct tog_cmd *cmd = &tog_commands[i];
9640 		fprintf(fp, " %s", cmd->name);
9641 	}
9642 	fputc('\n', fp);
9643 }
9644 
9645 __dead static void
9646 usage(int hflag, int status)
9647 {
9648 	FILE *fp = (status == 0) ? stdout : stderr;
9649 
9650 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9651 	    getprogname());
9652 	if (hflag) {
9653 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9654 		list_commands(fp);
9655 	}
9656 	exit(status);
9657 }
9658 
9659 static char **
9660 make_argv(int argc, ...)
9661 {
9662 	va_list ap;
9663 	char **argv;
9664 	int i;
9665 
9666 	va_start(ap, argc);
9667 
9668 	argv = calloc(argc, sizeof(char *));
9669 	if (argv == NULL)
9670 		err(1, "calloc");
9671 	for (i = 0; i < argc; i++) {
9672 		argv[i] = strdup(va_arg(ap, char *));
9673 		if (argv[i] == NULL)
9674 			err(1, "strdup");
9675 	}
9676 
9677 	va_end(ap);
9678 	return argv;
9679 }
9680 
9681 /*
9682  * Try to convert 'tog path' into a 'tog log path' command.
9683  * The user could simply have mistyped the command rather than knowingly
9684  * provided a path. So check whether argv[0] can in fact be resolved
9685  * to a path in the HEAD commit and print a special error if not.
9686  * This hack is for mpi@ <3
9687  */
9688 static const struct got_error *
9689 tog_log_with_path(int argc, char *argv[])
9690 {
9691 	const struct got_error *error = NULL, *close_err;
9692 	const struct tog_cmd *cmd = NULL;
9693 	struct got_repository *repo = NULL;
9694 	struct got_worktree *worktree = NULL;
9695 	struct got_object_id *commit_id = NULL, *id = NULL;
9696 	struct got_commit_object *commit = NULL;
9697 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9698 	char *commit_id_str = NULL, **cmd_argv = NULL;
9699 	int *pack_fds = NULL;
9700 
9701 	cwd = getcwd(NULL, 0);
9702 	if (cwd == NULL)
9703 		return got_error_from_errno("getcwd");
9704 
9705 	error = got_repo_pack_fds_open(&pack_fds);
9706 	if (error != NULL)
9707 		goto done;
9708 
9709 	error = got_worktree_open(&worktree, cwd);
9710 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9711 		goto done;
9712 
9713 	if (worktree)
9714 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9715 	else
9716 		repo_path = strdup(cwd);
9717 	if (repo_path == NULL) {
9718 		error = got_error_from_errno("strdup");
9719 		goto done;
9720 	}
9721 
9722 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9723 	if (error != NULL)
9724 		goto done;
9725 
9726 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9727 	    repo, worktree);
9728 	if (error)
9729 		goto done;
9730 
9731 	error = tog_load_refs(repo, 0);
9732 	if (error)
9733 		goto done;
9734 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9735 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9736 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9737 	if (error)
9738 		goto done;
9739 
9740 	if (worktree) {
9741 		got_worktree_close(worktree);
9742 		worktree = NULL;
9743 	}
9744 
9745 	error = got_object_open_as_commit(&commit, repo, commit_id);
9746 	if (error)
9747 		goto done;
9748 
9749 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9750 	if (error) {
9751 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9752 			goto done;
9753 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9754 		    getprogname(), argv[0]);
9755 		usage(1, 1);
9756 		/* not reached */
9757 	}
9758 
9759 	error = got_object_id_str(&commit_id_str, commit_id);
9760 	if (error)
9761 		goto done;
9762 
9763 	cmd = &tog_commands[0]; /* log */
9764 	argc = 4;
9765 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9766 	error = cmd->cmd_main(argc, cmd_argv);
9767 done:
9768 	if (repo) {
9769 		close_err = got_repo_close(repo);
9770 		if (error == NULL)
9771 			error = close_err;
9772 	}
9773 	if (commit)
9774 		got_object_commit_close(commit);
9775 	if (worktree)
9776 		got_worktree_close(worktree);
9777 	if (pack_fds) {
9778 		const struct got_error *pack_err =
9779 		    got_repo_pack_fds_close(pack_fds);
9780 		if (error == NULL)
9781 			error = pack_err;
9782 	}
9783 	free(id);
9784 	free(commit_id_str);
9785 	free(commit_id);
9786 	free(cwd);
9787 	free(repo_path);
9788 	free(in_repo_path);
9789 	if (cmd_argv) {
9790 		int i;
9791 		for (i = 0; i < argc; i++)
9792 			free(cmd_argv[i]);
9793 		free(cmd_argv);
9794 	}
9795 	tog_free_refs();
9796 	return error;
9797 }
9798 
9799 int
9800 main(int argc, char *argv[])
9801 {
9802 	const struct got_error *io_err, *error = NULL;
9803 	const struct tog_cmd *cmd = NULL;
9804 	int ch, hflag = 0, Vflag = 0;
9805 	char **cmd_argv = NULL;
9806 	static const struct option longopts[] = {
9807 	    { "version", no_argument, NULL, 'V' },
9808 	    { NULL, 0, NULL, 0}
9809 	};
9810 	char *diff_algo_str = NULL;
9811 	const char *test_script_path;
9812 
9813 	setlocale(LC_CTYPE, "");
9814 
9815 	/*
9816 	 * Test mode init must happen before pledge() because "tty" will
9817 	 * not allow TTY-related ioctls to occur via regular files.
9818 	 */
9819 	test_script_path = getenv("TOG_TEST_SCRIPT");
9820 	if (test_script_path != NULL) {
9821 		error = init_mock_term(test_script_path);
9822 		if (error) {
9823 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9824 			return 1;
9825 		}
9826 	} else if (!isatty(STDIN_FILENO))
9827 		errx(1, "standard input is not a tty");
9828 
9829 #if !defined(PROFILE)
9830 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9831 	    NULL) == -1)
9832 		err(1, "pledge");
9833 #endif
9834 
9835 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9836 		switch (ch) {
9837 		case 'h':
9838 			hflag = 1;
9839 			break;
9840 		case 'V':
9841 			Vflag = 1;
9842 			break;
9843 		default:
9844 			usage(hflag, 1);
9845 			/* NOTREACHED */
9846 		}
9847 	}
9848 
9849 	argc -= optind;
9850 	argv += optind;
9851 	optind = 1;
9852 	optreset = 1;
9853 
9854 	if (Vflag) {
9855 		got_version_print_str();
9856 		return 0;
9857 	}
9858 
9859 	if (argc == 0) {
9860 		if (hflag)
9861 			usage(hflag, 0);
9862 		/* Build an argument vector which runs a default command. */
9863 		cmd = &tog_commands[0];
9864 		argc = 1;
9865 		cmd_argv = make_argv(argc, cmd->name);
9866 	} else {
9867 		size_t i;
9868 
9869 		/* Did the user specify a command? */
9870 		for (i = 0; i < nitems(tog_commands); i++) {
9871 			if (strncmp(tog_commands[i].name, argv[0],
9872 			    strlen(argv[0])) == 0) {
9873 				cmd = &tog_commands[i];
9874 				break;
9875 			}
9876 		}
9877 	}
9878 
9879 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9880 	if (diff_algo_str) {
9881 		if (strcasecmp(diff_algo_str, "patience") == 0)
9882 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9883 		if (strcasecmp(diff_algo_str, "myers") == 0)
9884 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9885 	}
9886 
9887 	if (cmd == NULL) {
9888 		if (argc != 1)
9889 			usage(0, 1);
9890 		/* No command specified; try log with a path */
9891 		error = tog_log_with_path(argc, argv);
9892 	} else {
9893 		if (hflag)
9894 			cmd->cmd_usage();
9895 		else
9896 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9897 	}
9898 
9899 	if (using_mock_io) {
9900 		io_err = tog_io_close();
9901 		if (error == NULL)
9902 			error = io_err;
9903 	}
9904 	endwin();
9905 	if (cmd_argv) {
9906 		int i;
9907 		for (i = 0; i < argc; i++)
9908 			free(cmd_argv[i]);
9909 		free(cmd_argv);
9910 	}
9911 
9912 	if (error && error->code != GOT_ERR_CANCELLED &&
9913 	    error->code != GOT_ERR_EOF &&
9914 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9915 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9916 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9917 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9918 	return 0;
9919 }