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 characters 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 	if (refs == NULL)
2330 		return NULL;
2331 
2332 	TAILQ_FOREACH(re, refs, entry) {
2333 		struct got_tag_object *tag = NULL;
2334 		struct got_object_id *ref_id;
2335 		int cmp;
2336 
2337 		name = got_ref_get_name(re->ref);
2338 		if (strcmp(name, GOT_REF_HEAD) == 0)
2339 			continue;
2340 		if (strncmp(name, "refs/", 5) == 0)
2341 			name += 5;
2342 		if (strncmp(name, "got/", 4) == 0)
2343 			continue;
2344 		if (strncmp(name, "heads/", 6) == 0)
2345 			name += 6;
2346 		if (strncmp(name, "remotes/", 8) == 0) {
2347 			name += 8;
2348 			s = strstr(name, "/" GOT_REF_HEAD);
2349 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2350 				continue;
2351 		}
2352 		err = got_ref_resolve(&ref_id, repo, re->ref);
2353 		if (err)
2354 			break;
2355 		if (strncmp(name, "tags/", 5) == 0) {
2356 			err = got_object_open_as_tag(&tag, repo, ref_id);
2357 			if (err) {
2358 				if (err->code != GOT_ERR_OBJ_TYPE) {
2359 					free(ref_id);
2360 					break;
2361 				}
2362 				/* Ref points at something other than a tag. */
2363 				err = NULL;
2364 				tag = NULL;
2365 			}
2366 		}
2367 		cmp = got_object_id_cmp(tag ?
2368 		    got_object_tag_get_object_id(tag) : ref_id, id);
2369 		free(ref_id);
2370 		if (tag)
2371 			got_object_tag_close(tag);
2372 		if (cmp != 0)
2373 			continue;
2374 		s = *refs_str;
2375 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2376 		    s ? ", " : "", name) == -1) {
2377 			err = got_error_from_errno("asprintf");
2378 			free(s);
2379 			*refs_str = NULL;
2380 			break;
2381 		}
2382 		free(s);
2383 	}
2384 
2385 	return err;
2386 }
2387 
2388 static const struct got_error *
2389 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2390     int col_tab_align)
2391 {
2392 	char *smallerthan;
2393 
2394 	smallerthan = strchr(author, '<');
2395 	if (smallerthan && smallerthan[1] != '\0')
2396 		author = smallerthan + 1;
2397 	author[strcspn(author, "@>")] = '\0';
2398 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2399 	    col_tab_align, 0);
2400 }
2401 
2402 static const struct got_error *
2403 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2404     struct got_object_id *id, const size_t date_display_cols,
2405     int author_display_cols)
2406 {
2407 	struct tog_log_view_state *s = &view->state.log;
2408 	const struct got_error *err = NULL;
2409 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2410 	char *refs_str = NULL;
2411 	char *logmsg0 = NULL, *logmsg = NULL;
2412 	char *author = NULL;
2413 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2414 	int author_width, refstr_width, logmsg_width;
2415 	char *newline, *line = NULL;
2416 	int col, limit, scrollx, logmsg_x;
2417 	const int avail = view->ncols;
2418 	struct tm tm;
2419 	time_t committer_time;
2420 	struct tog_color *tc;
2421 	struct got_reflist_head *refs;
2422 
2423 	committer_time = got_object_commit_get_committer_time(commit);
2424 	if (gmtime_r(&committer_time, &tm) == NULL)
2425 		return got_error_from_errno("gmtime_r");
2426 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2427 		return got_error(GOT_ERR_NO_SPACE);
2428 
2429 	if (avail <= date_display_cols)
2430 		limit = MIN(sizeof(datebuf) - 1, avail);
2431 	else
2432 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2433 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2434 	if (tc)
2435 		wattr_on(view->window,
2436 		    COLOR_PAIR(tc->colorpair), NULL);
2437 	waddnstr(view->window, datebuf, limit);
2438 	if (tc)
2439 		wattr_off(view->window,
2440 		    COLOR_PAIR(tc->colorpair), NULL);
2441 	col = limit;
2442 	if (col > avail)
2443 		goto done;
2444 
2445 	if (avail >= 120) {
2446 		char *id_str;
2447 		err = got_object_id_str(&id_str, id);
2448 		if (err)
2449 			goto done;
2450 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2451 		if (tc)
2452 			wattr_on(view->window,
2453 			    COLOR_PAIR(tc->colorpair), NULL);
2454 		wprintw(view->window, "%.8s ", id_str);
2455 		if (tc)
2456 			wattr_off(view->window,
2457 			    COLOR_PAIR(tc->colorpair), NULL);
2458 		free(id_str);
2459 		col += 9;
2460 		if (col > avail)
2461 			goto done;
2462 	}
2463 
2464 	if (s->use_committer)
2465 		author = strdup(got_object_commit_get_committer(commit));
2466 	else
2467 		author = strdup(got_object_commit_get_author(commit));
2468 	if (author == NULL) {
2469 		err = got_error_from_errno("strdup");
2470 		goto done;
2471 	}
2472 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2473 	if (err)
2474 		goto done;
2475 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2476 	if (tc)
2477 		wattr_on(view->window,
2478 		    COLOR_PAIR(tc->colorpair), NULL);
2479 	waddwstr(view->window, wauthor);
2480 	col += author_width;
2481 	while (col < avail && author_width < author_display_cols + 2) {
2482 		waddch(view->window, ' ');
2483 		col++;
2484 		author_width++;
2485 	}
2486 	if (tc)
2487 		wattr_off(view->window,
2488 		    COLOR_PAIR(tc->colorpair), NULL);
2489 	if (col > avail)
2490 		goto done;
2491 
2492 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2493 	if (err)
2494 		goto done;
2495 	logmsg = logmsg0;
2496 	while (*logmsg == '\n')
2497 		logmsg++;
2498 	newline = strchr(logmsg, '\n');
2499 	if (newline)
2500 		*newline = '\0';
2501 
2502 	limit = avail - col;
2503 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2504 		limit--;	/* for the border */
2505 
2506 	/* Prepend reference labels to log message if possible .*/
2507 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2508 	err = build_refs_str(&refs_str, refs, id, s->repo);
2509 	if (err)
2510 		goto done;
2511 	if (refs_str) {
2512 		char *rs;
2513 
2514 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2515 			err = got_error_from_errno("asprintf");
2516 			goto done;
2517 		}
2518 		err = format_line(&wrefstr, &refstr_width,
2519 		    &scrollx, rs, view->x, limit, col, 1);
2520 		free(rs);
2521 		if (err)
2522 			goto done;
2523 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2524 		if (tc)
2525 			wattr_on(view->window,
2526 			    COLOR_PAIR(tc->colorpair), NULL);
2527 		waddwstr(view->window, &wrefstr[scrollx]);
2528 		if (tc)
2529 			wattr_off(view->window,
2530 			    COLOR_PAIR(tc->colorpair), NULL);
2531 		col += MAX(refstr_width, 0);
2532 		if (col > avail)
2533 			goto done;
2534 
2535 		if (col < avail) {
2536 			waddch(view->window, ' ');
2537 			col++;
2538 		}
2539 
2540 		if (refstr_width > 0)
2541 			logmsg_x = 0;
2542 		else {
2543 			int unscrolled_refstr_width;
2544 			size_t len = wcslen(wrefstr);
2545 
2546 			/*
2547 			 * No need to check for -1 return value here since
2548 			 * unprintables have been replaced by span_wline().
2549 			 */
2550 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2551 			unscrolled_refstr_width += 1; /* trailing space */
2552 			logmsg_x = view->x - unscrolled_refstr_width;
2553 		}
2554 
2555 		limit = avail - col;
2556 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2557 			limit--;	/* for the border */
2558 	} else
2559 		logmsg_x = view->x;
2560 
2561 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2562 	    limit, col, 1);
2563 	if (err)
2564 		goto done;
2565 	waddwstr(view->window, &wlogmsg[scrollx]);
2566 	col += MAX(logmsg_width, 0);
2567 	while (col < avail) {
2568 		waddch(view->window, ' ');
2569 		col++;
2570 	}
2571 done:
2572 	free(logmsg0);
2573 	free(wlogmsg);
2574 	free(wrefstr);
2575 	free(refs_str);
2576 	free(author);
2577 	free(wauthor);
2578 	free(line);
2579 	return err;
2580 }
2581 
2582 static struct commit_queue_entry *
2583 alloc_commit_queue_entry(struct got_commit_object *commit,
2584     struct got_object_id *id)
2585 {
2586 	struct commit_queue_entry *entry;
2587 	struct got_object_id *dup;
2588 
2589 	entry = calloc(1, sizeof(*entry));
2590 	if (entry == NULL)
2591 		return NULL;
2592 
2593 	dup = got_object_id_dup(id);
2594 	if (dup == NULL) {
2595 		free(entry);
2596 		return NULL;
2597 	}
2598 
2599 	entry->id = dup;
2600 	entry->commit = commit;
2601 	return entry;
2602 }
2603 
2604 static void
2605 pop_commit(struct commit_queue *commits)
2606 {
2607 	struct commit_queue_entry *entry;
2608 
2609 	entry = TAILQ_FIRST(&commits->head);
2610 	TAILQ_REMOVE(&commits->head, entry, entry);
2611 	got_object_commit_close(entry->commit);
2612 	commits->ncommits--;
2613 	free(entry->id);
2614 	free(entry);
2615 }
2616 
2617 static void
2618 free_commits(struct commit_queue *commits)
2619 {
2620 	while (!TAILQ_EMPTY(&commits->head))
2621 		pop_commit(commits);
2622 }
2623 
2624 static const struct got_error *
2625 match_commit(int *have_match, struct got_object_id *id,
2626     struct got_commit_object *commit, regex_t *regex)
2627 {
2628 	const struct got_error *err = NULL;
2629 	regmatch_t regmatch;
2630 	char *id_str = NULL, *logmsg = NULL;
2631 
2632 	*have_match = 0;
2633 
2634 	err = got_object_id_str(&id_str, id);
2635 	if (err)
2636 		return err;
2637 
2638 	err = got_object_commit_get_logmsg(&logmsg, commit);
2639 	if (err)
2640 		goto done;
2641 
2642 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2643 	    &regmatch, 0) == 0 ||
2644 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2645 	    &regmatch, 0) == 0 ||
2646 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2647 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2648 		*have_match = 1;
2649 done:
2650 	free(id_str);
2651 	free(logmsg);
2652 	return err;
2653 }
2654 
2655 static const struct got_error *
2656 queue_commits(struct tog_log_thread_args *a)
2657 {
2658 	const struct got_error *err = NULL;
2659 
2660 	/*
2661 	 * We keep all commits open throughout the lifetime of the log
2662 	 * view in order to avoid having to re-fetch commits from disk
2663 	 * while updating the display.
2664 	 */
2665 	do {
2666 		struct got_object_id id;
2667 		struct got_commit_object *commit;
2668 		struct commit_queue_entry *entry;
2669 		int limit_match = 0;
2670 		int errcode;
2671 
2672 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2673 		    NULL, NULL);
2674 		if (err)
2675 			break;
2676 
2677 		err = got_object_open_as_commit(&commit, a->repo, &id);
2678 		if (err)
2679 			break;
2680 		entry = alloc_commit_queue_entry(commit, &id);
2681 		if (entry == NULL) {
2682 			err = got_error_from_errno("alloc_commit_queue_entry");
2683 			break;
2684 		}
2685 
2686 		errcode = pthread_mutex_lock(&tog_mutex);
2687 		if (errcode) {
2688 			err = got_error_set_errno(errcode,
2689 			    "pthread_mutex_lock");
2690 			break;
2691 		}
2692 
2693 		entry->idx = a->real_commits->ncommits;
2694 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2695 		a->real_commits->ncommits++;
2696 
2697 		if (*a->limiting) {
2698 			err = match_commit(&limit_match, &id, commit,
2699 			    a->limit_regex);
2700 			if (err)
2701 				break;
2702 
2703 			if (limit_match) {
2704 				struct commit_queue_entry *matched;
2705 
2706 				matched = alloc_commit_queue_entry(
2707 				    entry->commit, entry->id);
2708 				if (matched == NULL) {
2709 					err = got_error_from_errno(
2710 					    "alloc_commit_queue_entry");
2711 					break;
2712 				}
2713 				matched->commit = entry->commit;
2714 				got_object_commit_retain(entry->commit);
2715 
2716 				matched->idx = a->limit_commits->ncommits;
2717 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2718 				    matched, entry);
2719 				a->limit_commits->ncommits++;
2720 			}
2721 
2722 			/*
2723 			 * This is how we signal log_thread() that we
2724 			 * have found a match, and that it should be
2725 			 * counted as a new entry for the view.
2726 			 */
2727 			a->limit_match = limit_match;
2728 		}
2729 
2730 		if (*a->searching == TOG_SEARCH_FORWARD &&
2731 		    !*a->search_next_done) {
2732 			int have_match;
2733 			err = match_commit(&have_match, &id, commit, a->regex);
2734 			if (err)
2735 				break;
2736 
2737 			if (*a->limiting) {
2738 				if (limit_match && have_match)
2739 					*a->search_next_done =
2740 					    TOG_SEARCH_HAVE_MORE;
2741 			} else if (have_match)
2742 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2743 		}
2744 
2745 		errcode = pthread_mutex_unlock(&tog_mutex);
2746 		if (errcode && err == NULL)
2747 			err = got_error_set_errno(errcode,
2748 			    "pthread_mutex_unlock");
2749 		if (err)
2750 			break;
2751 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2752 
2753 	return err;
2754 }
2755 
2756 static void
2757 select_commit(struct tog_log_view_state *s)
2758 {
2759 	struct commit_queue_entry *entry;
2760 	int ncommits = 0;
2761 
2762 	entry = s->first_displayed_entry;
2763 	while (entry) {
2764 		if (ncommits == s->selected) {
2765 			s->selected_entry = entry;
2766 			break;
2767 		}
2768 		entry = TAILQ_NEXT(entry, entry);
2769 		ncommits++;
2770 	}
2771 }
2772 
2773 static const struct got_error *
2774 draw_commits(struct tog_view *view)
2775 {
2776 	const struct got_error *err = NULL;
2777 	struct tog_log_view_state *s = &view->state.log;
2778 	struct commit_queue_entry *entry = s->selected_entry;
2779 	int limit = view->nlines;
2780 	int width;
2781 	int ncommits, author_cols = 4, refstr_cols;
2782 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2783 	char *refs_str = NULL;
2784 	wchar_t *wline;
2785 	struct tog_color *tc;
2786 	static const size_t date_display_cols = 12;
2787 	struct got_reflist_head *refs;
2788 
2789 	if (view_is_hsplit_top(view))
2790 		--limit;  /* account for border */
2791 
2792 	if (s->selected_entry &&
2793 	    !(view->searching && view->search_next_done == 0)) {
2794 		err = got_object_id_str(&id_str, s->selected_entry->id);
2795 		if (err)
2796 			return err;
2797 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2798 		    s->selected_entry->id);
2799 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2800 		    s->repo);
2801 		if (err)
2802 			goto done;
2803 	}
2804 
2805 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2806 		halfdelay(10); /* disable fast refresh */
2807 
2808 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2809 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2810 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2811 		    (view->searching && !view->search_next_done) ?
2812 		    "searching..." : "loading...") == -1) {
2813 			err = got_error_from_errno("asprintf");
2814 			goto done;
2815 		}
2816 	} else {
2817 		const char *search_str = NULL;
2818 		const char *limit_str = NULL;
2819 
2820 		if (view->searching) {
2821 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2822 				search_str = "no more matches";
2823 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2824 				search_str = "no matches found";
2825 			else if (!view->search_next_done)
2826 				search_str = "searching...";
2827 		}
2828 
2829 		if (s->limit_view && s->commits->ncommits == 0)
2830 			limit_str = "no matches found";
2831 
2832 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2833 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2834 		    search_str ? search_str : (refs_str ? refs_str : ""),
2835 		    limit_str ? limit_str : "") == -1) {
2836 			err = got_error_from_errno("asprintf");
2837 			goto done;
2838 		}
2839 	}
2840 
2841 	free(refs_str);
2842 	refs_str = NULL;
2843 
2844 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2845 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2846 		    "........................................",
2847 		    s->in_repo_path, ncommits_str) == -1) {
2848 			err = got_error_from_errno("asprintf");
2849 			header = NULL;
2850 			goto done;
2851 		}
2852 	} else if (asprintf(&header, "commit %s%s",
2853 	    id_str ? id_str : "........................................",
2854 	    ncommits_str) == -1) {
2855 		err = got_error_from_errno("asprintf");
2856 		header = NULL;
2857 		goto done;
2858 	}
2859 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2860 	if (err)
2861 		goto done;
2862 
2863 	werase(view->window);
2864 
2865 	if (view_needs_focus_indication(view))
2866 		wstandout(view->window);
2867 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2868 	if (tc)
2869 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2870 	waddwstr(view->window, wline);
2871 	while (width < view->ncols) {
2872 		waddch(view->window, ' ');
2873 		width++;
2874 	}
2875 	if (tc)
2876 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2877 	if (view_needs_focus_indication(view))
2878 		wstandend(view->window);
2879 	free(wline);
2880 	if (limit <= 1)
2881 		goto done;
2882 
2883 	/* Grow author column size if necessary, and set view->maxx. */
2884 	entry = s->first_displayed_entry;
2885 	ncommits = 0;
2886 	view->maxx = 0;
2887 	while (entry) {
2888 		struct got_commit_object *c = entry->commit;
2889 		char *author, *eol, *msg, *msg0;
2890 		wchar_t *wauthor, *wmsg;
2891 		int width;
2892 		if (ncommits >= limit - 1)
2893 			break;
2894 		if (s->use_committer)
2895 			author = strdup(got_object_commit_get_committer(c));
2896 		else
2897 			author = strdup(got_object_commit_get_author(c));
2898 		if (author == NULL) {
2899 			err = got_error_from_errno("strdup");
2900 			goto done;
2901 		}
2902 		err = format_author(&wauthor, &width, author, COLS,
2903 		    date_display_cols);
2904 		if (author_cols < width)
2905 			author_cols = width;
2906 		free(wauthor);
2907 		free(author);
2908 		if (err)
2909 			goto done;
2910 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2911 		    entry->id);
2912 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2913 		if (err)
2914 			goto done;
2915 		if (refs_str) {
2916 			wchar_t *ws;
2917 			err = format_line(&ws, &width, NULL, refs_str,
2918 			    0, INT_MAX, date_display_cols + author_cols, 0);
2919 			free(ws);
2920 			free(refs_str);
2921 			refs_str = NULL;
2922 			if (err)
2923 				goto done;
2924 			refstr_cols = width + 3; /* account for [ ] + space */
2925 		} else
2926 			refstr_cols = 0;
2927 		err = got_object_commit_get_logmsg(&msg0, c);
2928 		if (err)
2929 			goto done;
2930 		msg = msg0;
2931 		while (*msg == '\n')
2932 			++msg;
2933 		if ((eol = strchr(msg, '\n')))
2934 			*eol = '\0';
2935 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2936 		    date_display_cols + author_cols + refstr_cols, 0);
2937 		if (err)
2938 			goto done;
2939 		view->maxx = MAX(view->maxx, width + refstr_cols);
2940 		free(msg0);
2941 		free(wmsg);
2942 		ncommits++;
2943 		entry = TAILQ_NEXT(entry, entry);
2944 	}
2945 
2946 	entry = s->first_displayed_entry;
2947 	s->last_displayed_entry = s->first_displayed_entry;
2948 	ncommits = 0;
2949 	while (entry) {
2950 		if (ncommits >= limit - 1)
2951 			break;
2952 		if (ncommits == s->selected)
2953 			wstandout(view->window);
2954 		err = draw_commit(view, entry->commit, entry->id,
2955 		    date_display_cols, author_cols);
2956 		if (ncommits == s->selected)
2957 			wstandend(view->window);
2958 		if (err)
2959 			goto done;
2960 		ncommits++;
2961 		s->last_displayed_entry = entry;
2962 		entry = TAILQ_NEXT(entry, entry);
2963 	}
2964 
2965 	view_border(view);
2966 done:
2967 	free(id_str);
2968 	free(refs_str);
2969 	free(ncommits_str);
2970 	free(header);
2971 	return err;
2972 }
2973 
2974 static void
2975 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2976 {
2977 	struct commit_queue_entry *entry;
2978 	int nscrolled = 0;
2979 
2980 	entry = TAILQ_FIRST(&s->commits->head);
2981 	if (s->first_displayed_entry == entry)
2982 		return;
2983 
2984 	entry = s->first_displayed_entry;
2985 	while (entry && nscrolled < maxscroll) {
2986 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2987 		if (entry) {
2988 			s->first_displayed_entry = entry;
2989 			nscrolled++;
2990 		}
2991 	}
2992 }
2993 
2994 static const struct got_error *
2995 trigger_log_thread(struct tog_view *view, int wait)
2996 {
2997 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2998 	int errcode;
2999 
3000 	if (!using_mock_io)
3001 		halfdelay(1); /* fast refresh while loading commits */
3002 
3003 	while (!ta->log_complete && !tog_thread_error &&
3004 	    (ta->commits_needed > 0 || ta->load_all)) {
3005 		/* Wake the log thread. */
3006 		errcode = pthread_cond_signal(&ta->need_commits);
3007 		if (errcode)
3008 			return got_error_set_errno(errcode,
3009 			    "pthread_cond_signal");
3010 
3011 		/*
3012 		 * The mutex will be released while the view loop waits
3013 		 * in wgetch(), at which time the log thread will run.
3014 		 */
3015 		if (!wait)
3016 			break;
3017 
3018 		/* Display progress update in log view. */
3019 		show_log_view(view);
3020 		update_panels();
3021 		doupdate();
3022 
3023 		/* Wait right here while next commit is being loaded. */
3024 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3025 		if (errcode)
3026 			return got_error_set_errno(errcode,
3027 			    "pthread_cond_wait");
3028 
3029 		/* Display progress update in log view. */
3030 		show_log_view(view);
3031 		update_panels();
3032 		doupdate();
3033 	}
3034 
3035 	return NULL;
3036 }
3037 
3038 static const struct got_error *
3039 request_log_commits(struct tog_view *view)
3040 {
3041 	struct tog_log_view_state	*state = &view->state.log;
3042 	const struct got_error		*err = NULL;
3043 
3044 	if (state->thread_args.log_complete)
3045 		return NULL;
3046 
3047 	state->thread_args.commits_needed += view->nscrolled;
3048 	err = trigger_log_thread(view, 1);
3049 	view->nscrolled = 0;
3050 
3051 	return err;
3052 }
3053 
3054 static const struct got_error *
3055 log_scroll_down(struct tog_view *view, int maxscroll)
3056 {
3057 	struct tog_log_view_state *s = &view->state.log;
3058 	const struct got_error *err = NULL;
3059 	struct commit_queue_entry *pentry;
3060 	int nscrolled = 0, ncommits_needed;
3061 
3062 	if (s->last_displayed_entry == NULL)
3063 		return NULL;
3064 
3065 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3066 	if (s->commits->ncommits < ncommits_needed &&
3067 	    !s->thread_args.log_complete) {
3068 		/*
3069 		 * Ask the log thread for required amount of commits.
3070 		 */
3071 		s->thread_args.commits_needed +=
3072 		    ncommits_needed - s->commits->ncommits;
3073 		err = trigger_log_thread(view, 1);
3074 		if (err)
3075 			return err;
3076 	}
3077 
3078 	do {
3079 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3080 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3081 			break;
3082 
3083 		s->last_displayed_entry = pentry ?
3084 		    pentry : s->last_displayed_entry;
3085 
3086 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3087 		if (pentry == NULL)
3088 			break;
3089 		s->first_displayed_entry = pentry;
3090 	} while (++nscrolled < maxscroll);
3091 
3092 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3093 		view->nscrolled += nscrolled;
3094 	else
3095 		view->nscrolled = 0;
3096 
3097 	return err;
3098 }
3099 
3100 static const struct got_error *
3101 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3102     struct got_commit_object *commit, struct got_object_id *commit_id,
3103     struct tog_view *log_view, struct got_repository *repo)
3104 {
3105 	const struct got_error *err;
3106 	struct got_object_qid *parent_id;
3107 	struct tog_view *diff_view;
3108 
3109 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3110 	if (diff_view == NULL)
3111 		return got_error_from_errno("view_open");
3112 
3113 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3114 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3115 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3116 	if (err == NULL)
3117 		*new_view = diff_view;
3118 	return err;
3119 }
3120 
3121 static const struct got_error *
3122 tree_view_visit_subtree(struct tog_tree_view_state *s,
3123     struct got_tree_object *subtree)
3124 {
3125 	struct tog_parent_tree *parent;
3126 
3127 	parent = calloc(1, sizeof(*parent));
3128 	if (parent == NULL)
3129 		return got_error_from_errno("calloc");
3130 
3131 	parent->tree = s->tree;
3132 	parent->first_displayed_entry = s->first_displayed_entry;
3133 	parent->selected_entry = s->selected_entry;
3134 	parent->selected = s->selected;
3135 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3136 	s->tree = subtree;
3137 	s->selected = 0;
3138 	s->first_displayed_entry = NULL;
3139 	return NULL;
3140 }
3141 
3142 static const struct got_error *
3143 tree_view_walk_path(struct tog_tree_view_state *s,
3144     struct got_commit_object *commit, const char *path)
3145 {
3146 	const struct got_error *err = NULL;
3147 	struct got_tree_object *tree = NULL;
3148 	const char *p;
3149 	char *slash, *subpath = NULL;
3150 
3151 	/* Walk the path and open corresponding tree objects. */
3152 	p = path;
3153 	while (*p) {
3154 		struct got_tree_entry *te;
3155 		struct got_object_id *tree_id;
3156 		char *te_name;
3157 
3158 		while (p[0] == '/')
3159 			p++;
3160 
3161 		/* Ensure the correct subtree entry is selected. */
3162 		slash = strchr(p, '/');
3163 		if (slash == NULL)
3164 			te_name = strdup(p);
3165 		else
3166 			te_name = strndup(p, slash - p);
3167 		if (te_name == NULL) {
3168 			err = got_error_from_errno("strndup");
3169 			break;
3170 		}
3171 		te = got_object_tree_find_entry(s->tree, te_name);
3172 		if (te == NULL) {
3173 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3174 			free(te_name);
3175 			break;
3176 		}
3177 		free(te_name);
3178 		s->first_displayed_entry = s->selected_entry = te;
3179 
3180 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3181 			break; /* jump to this file's entry */
3182 
3183 		slash = strchr(p, '/');
3184 		if (slash)
3185 			subpath = strndup(path, slash - path);
3186 		else
3187 			subpath = strdup(path);
3188 		if (subpath == NULL) {
3189 			err = got_error_from_errno("strdup");
3190 			break;
3191 		}
3192 
3193 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3194 		    subpath);
3195 		if (err)
3196 			break;
3197 
3198 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3199 		free(tree_id);
3200 		if (err)
3201 			break;
3202 
3203 		err = tree_view_visit_subtree(s, tree);
3204 		if (err) {
3205 			got_object_tree_close(tree);
3206 			break;
3207 		}
3208 		if (slash == NULL)
3209 			break;
3210 		free(subpath);
3211 		subpath = NULL;
3212 		p = slash;
3213 	}
3214 
3215 	free(subpath);
3216 	return err;
3217 }
3218 
3219 static const struct got_error *
3220 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3221     struct commit_queue_entry *entry, const char *path,
3222     const char *head_ref_name, struct got_repository *repo)
3223 {
3224 	const struct got_error *err = NULL;
3225 	struct tog_tree_view_state *s;
3226 	struct tog_view *tree_view;
3227 
3228 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3229 	if (tree_view == NULL)
3230 		return got_error_from_errno("view_open");
3231 
3232 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3233 	if (err)
3234 		return err;
3235 	s = &tree_view->state.tree;
3236 
3237 	*new_view = tree_view;
3238 
3239 	if (got_path_is_root_dir(path))
3240 		return NULL;
3241 
3242 	return tree_view_walk_path(s, entry->commit, path);
3243 }
3244 
3245 static const struct got_error *
3246 block_signals_used_by_main_thread(void)
3247 {
3248 	sigset_t sigset;
3249 	int errcode;
3250 
3251 	if (sigemptyset(&sigset) == -1)
3252 		return got_error_from_errno("sigemptyset");
3253 
3254 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3255 	if (sigaddset(&sigset, SIGWINCH) == -1)
3256 		return got_error_from_errno("sigaddset");
3257 	if (sigaddset(&sigset, SIGCONT) == -1)
3258 		return got_error_from_errno("sigaddset");
3259 	if (sigaddset(&sigset, SIGINT) == -1)
3260 		return got_error_from_errno("sigaddset");
3261 	if (sigaddset(&sigset, SIGTERM) == -1)
3262 		return got_error_from_errno("sigaddset");
3263 
3264 	/* ncurses handles SIGTSTP */
3265 	if (sigaddset(&sigset, SIGTSTP) == -1)
3266 		return got_error_from_errno("sigaddset");
3267 
3268 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3269 	if (errcode)
3270 		return got_error_set_errno(errcode, "pthread_sigmask");
3271 
3272 	return NULL;
3273 }
3274 
3275 static void *
3276 log_thread(void *arg)
3277 {
3278 	const struct got_error *err = NULL;
3279 	int errcode = 0;
3280 	struct tog_log_thread_args *a = arg;
3281 	int done = 0;
3282 
3283 	/*
3284 	 * Sync startup with main thread such that we begin our
3285 	 * work once view_input() has released the mutex.
3286 	 */
3287 	errcode = pthread_mutex_lock(&tog_mutex);
3288 	if (errcode) {
3289 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3290 		return (void *)err;
3291 	}
3292 
3293 	err = block_signals_used_by_main_thread();
3294 	if (err) {
3295 		pthread_mutex_unlock(&tog_mutex);
3296 		goto done;
3297 	}
3298 
3299 	while (!done && !err && !tog_fatal_signal_received()) {
3300 		errcode = pthread_mutex_unlock(&tog_mutex);
3301 		if (errcode) {
3302 			err = got_error_set_errno(errcode,
3303 			    "pthread_mutex_unlock");
3304 			goto done;
3305 		}
3306 		err = queue_commits(a);
3307 		if (err) {
3308 			if (err->code != GOT_ERR_ITER_COMPLETED)
3309 				goto done;
3310 			err = NULL;
3311 			done = 1;
3312 		} else if (a->commits_needed > 0 && !a->load_all) {
3313 			if (*a->limiting) {
3314 				if (a->limit_match)
3315 					a->commits_needed--;
3316 			} else
3317 				a->commits_needed--;
3318 		}
3319 
3320 		errcode = pthread_mutex_lock(&tog_mutex);
3321 		if (errcode) {
3322 			err = got_error_set_errno(errcode,
3323 			    "pthread_mutex_lock");
3324 			goto done;
3325 		} else if (*a->quit)
3326 			done = 1;
3327 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3328 			*a->first_displayed_entry =
3329 			    TAILQ_FIRST(&a->limit_commits->head);
3330 			*a->selected_entry = *a->first_displayed_entry;
3331 		} else if (*a->first_displayed_entry == NULL) {
3332 			*a->first_displayed_entry =
3333 			    TAILQ_FIRST(&a->real_commits->head);
3334 			*a->selected_entry = *a->first_displayed_entry;
3335 		}
3336 
3337 		errcode = pthread_cond_signal(&a->commit_loaded);
3338 		if (errcode) {
3339 			err = got_error_set_errno(errcode,
3340 			    "pthread_cond_signal");
3341 			pthread_mutex_unlock(&tog_mutex);
3342 			goto done;
3343 		}
3344 
3345 		if (done)
3346 			a->commits_needed = 0;
3347 		else {
3348 			if (a->commits_needed == 0 && !a->load_all) {
3349 				errcode = pthread_cond_wait(&a->need_commits,
3350 				    &tog_mutex);
3351 				if (errcode) {
3352 					err = got_error_set_errno(errcode,
3353 					    "pthread_cond_wait");
3354 					pthread_mutex_unlock(&tog_mutex);
3355 					goto done;
3356 				}
3357 				if (*a->quit)
3358 					done = 1;
3359 			}
3360 		}
3361 	}
3362 	a->log_complete = 1;
3363 	errcode = pthread_mutex_unlock(&tog_mutex);
3364 	if (errcode)
3365 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3366 done:
3367 	if (err) {
3368 		tog_thread_error = 1;
3369 		pthread_cond_signal(&a->commit_loaded);
3370 	}
3371 	return (void *)err;
3372 }
3373 
3374 static const struct got_error *
3375 stop_log_thread(struct tog_log_view_state *s)
3376 {
3377 	const struct got_error *err = NULL, *thread_err = NULL;
3378 	int errcode;
3379 
3380 	if (s->thread) {
3381 		s->quit = 1;
3382 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3383 		if (errcode)
3384 			return got_error_set_errno(errcode,
3385 			    "pthread_cond_signal");
3386 		errcode = pthread_mutex_unlock(&tog_mutex);
3387 		if (errcode)
3388 			return got_error_set_errno(errcode,
3389 			    "pthread_mutex_unlock");
3390 		errcode = pthread_join(s->thread, (void **)&thread_err);
3391 		if (errcode)
3392 			return got_error_set_errno(errcode, "pthread_join");
3393 		errcode = pthread_mutex_lock(&tog_mutex);
3394 		if (errcode)
3395 			return got_error_set_errno(errcode,
3396 			    "pthread_mutex_lock");
3397 		s->thread = 0; //NULL;
3398 	}
3399 
3400 	if (s->thread_args.repo) {
3401 		err = got_repo_close(s->thread_args.repo);
3402 		s->thread_args.repo = NULL;
3403 	}
3404 
3405 	if (s->thread_args.pack_fds) {
3406 		const struct got_error *pack_err =
3407 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3408 		if (err == NULL)
3409 			err = pack_err;
3410 		s->thread_args.pack_fds = NULL;
3411 	}
3412 
3413 	if (s->thread_args.graph) {
3414 		got_commit_graph_close(s->thread_args.graph);
3415 		s->thread_args.graph = NULL;
3416 	}
3417 
3418 	return err ? err : thread_err;
3419 }
3420 
3421 static const struct got_error *
3422 close_log_view(struct tog_view *view)
3423 {
3424 	const struct got_error *err = NULL;
3425 	struct tog_log_view_state *s = &view->state.log;
3426 	int errcode;
3427 
3428 	err = stop_log_thread(s);
3429 
3430 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3431 	if (errcode && err == NULL)
3432 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3433 
3434 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3435 	if (errcode && err == NULL)
3436 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3437 
3438 	free_commits(&s->limit_commits);
3439 	free_commits(&s->real_commits);
3440 	free(s->in_repo_path);
3441 	s->in_repo_path = NULL;
3442 	free(s->start_id);
3443 	s->start_id = NULL;
3444 	free(s->head_ref_name);
3445 	s->head_ref_name = NULL;
3446 	return err;
3447 }
3448 
3449 /*
3450  * We use two queues to implement the limit feature: first consists of
3451  * commits matching the current limit_regex; second is the real queue
3452  * of all known commits (real_commits). When the user starts limiting,
3453  * we swap queues such that all movement and displaying functionality
3454  * works with very slight change.
3455  */
3456 static const struct got_error *
3457 limit_log_view(struct tog_view *view)
3458 {
3459 	struct tog_log_view_state *s = &view->state.log;
3460 	struct commit_queue_entry *entry;
3461 	struct tog_view	*v = view;
3462 	const struct got_error *err = NULL;
3463 	char pattern[1024];
3464 	int ret;
3465 
3466 	if (view_is_hsplit_top(view))
3467 		v = view->child;
3468 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3469 		v = view->parent;
3470 
3471 	/* Get the pattern */
3472 	wmove(v->window, v->nlines - 1, 0);
3473 	wclrtoeol(v->window);
3474 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3475 	nodelay(v->window, FALSE);
3476 	nocbreak();
3477 	echo();
3478 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3479 	cbreak();
3480 	noecho();
3481 	nodelay(v->window, TRUE);
3482 	if (ret == ERR)
3483 		return NULL;
3484 
3485 	if (*pattern == '\0') {
3486 		/*
3487 		 * Safety measure for the situation where the user
3488 		 * resets limit without previously limiting anything.
3489 		 */
3490 		if (!s->limit_view)
3491 			return NULL;
3492 
3493 		/*
3494 		 * User could have pressed Ctrl+L, which refreshed the
3495 		 * commit queues, it means we can't save previously
3496 		 * (before limit took place) displayed entries,
3497 		 * because they would point to already free'ed memory,
3498 		 * so we are forced to always select first entry of
3499 		 * the queue.
3500 		 */
3501 		s->commits = &s->real_commits;
3502 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3503 		s->selected_entry = s->first_displayed_entry;
3504 		s->selected = 0;
3505 		s->limit_view = 0;
3506 
3507 		return NULL;
3508 	}
3509 
3510 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3511 		return NULL;
3512 
3513 	s->limit_view = 1;
3514 
3515 	/* Clear the screen while loading limit view */
3516 	s->first_displayed_entry = NULL;
3517 	s->last_displayed_entry = NULL;
3518 	s->selected_entry = NULL;
3519 	s->commits = &s->limit_commits;
3520 
3521 	/* Prepare limit queue for new search */
3522 	free_commits(&s->limit_commits);
3523 	s->limit_commits.ncommits = 0;
3524 
3525 	/* First process commits, which are in queue already */
3526 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3527 		int have_match = 0;
3528 
3529 		err = match_commit(&have_match, entry->id,
3530 		    entry->commit, &s->limit_regex);
3531 		if (err)
3532 			return err;
3533 
3534 		if (have_match) {
3535 			struct commit_queue_entry *matched;
3536 
3537 			matched = alloc_commit_queue_entry(entry->commit,
3538 			    entry->id);
3539 			if (matched == NULL) {
3540 				err = got_error_from_errno(
3541 				    "alloc_commit_queue_entry");
3542 				break;
3543 			}
3544 			matched->commit = entry->commit;
3545 			got_object_commit_retain(entry->commit);
3546 
3547 			matched->idx = s->limit_commits.ncommits;
3548 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3549 			    matched, entry);
3550 			s->limit_commits.ncommits++;
3551 		}
3552 	}
3553 
3554 	/* Second process all the commits, until we fill the screen */
3555 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3556 	    !s->thread_args.log_complete) {
3557 		s->thread_args.commits_needed +=
3558 		    view->nlines - s->limit_commits.ncommits - 1;
3559 		err = trigger_log_thread(view, 1);
3560 		if (err)
3561 			return err;
3562 	}
3563 
3564 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3565 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3566 	s->selected = 0;
3567 
3568 	return NULL;
3569 }
3570 
3571 static const struct got_error *
3572 search_start_log_view(struct tog_view *view)
3573 {
3574 	struct tog_log_view_state *s = &view->state.log;
3575 
3576 	s->matched_entry = NULL;
3577 	s->search_entry = NULL;
3578 	return NULL;
3579 }
3580 
3581 static const struct got_error *
3582 search_next_log_view(struct tog_view *view)
3583 {
3584 	const struct got_error *err = NULL;
3585 	struct tog_log_view_state *s = &view->state.log;
3586 	struct commit_queue_entry *entry;
3587 
3588 	/* Display progress update in log view. */
3589 	show_log_view(view);
3590 	update_panels();
3591 	doupdate();
3592 
3593 	if (s->search_entry) {
3594 		int errcode, ch;
3595 		errcode = pthread_mutex_unlock(&tog_mutex);
3596 		if (errcode)
3597 			return got_error_set_errno(errcode,
3598 			    "pthread_mutex_unlock");
3599 		ch = wgetch(view->window);
3600 		errcode = pthread_mutex_lock(&tog_mutex);
3601 		if (errcode)
3602 			return got_error_set_errno(errcode,
3603 			    "pthread_mutex_lock");
3604 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3605 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3606 			return NULL;
3607 		}
3608 		if (view->searching == TOG_SEARCH_FORWARD)
3609 			entry = TAILQ_NEXT(s->search_entry, entry);
3610 		else
3611 			entry = TAILQ_PREV(s->search_entry,
3612 			    commit_queue_head, entry);
3613 	} else if (s->matched_entry) {
3614 		/*
3615 		 * If the user has moved the cursor after we hit a match,
3616 		 * the position from where we should continue searching
3617 		 * might have changed.
3618 		 */
3619 		if (view->searching == TOG_SEARCH_FORWARD)
3620 			entry = TAILQ_NEXT(s->selected_entry, entry);
3621 		else
3622 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3623 			    entry);
3624 	} else {
3625 		entry = s->selected_entry;
3626 	}
3627 
3628 	while (1) {
3629 		int have_match = 0;
3630 
3631 		if (entry == NULL) {
3632 			if (s->thread_args.log_complete ||
3633 			    view->searching == TOG_SEARCH_BACKWARD) {
3634 				view->search_next_done =
3635 				    (s->matched_entry == NULL ?
3636 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3637 				s->search_entry = NULL;
3638 				return NULL;
3639 			}
3640 			/*
3641 			 * Poke the log thread for more commits and return,
3642 			 * allowing the main loop to make progress. Search
3643 			 * will resume at s->search_entry once we come back.
3644 			 */
3645 			s->thread_args.commits_needed++;
3646 			return trigger_log_thread(view, 0);
3647 		}
3648 
3649 		err = match_commit(&have_match, entry->id, entry->commit,
3650 		    &view->regex);
3651 		if (err)
3652 			break;
3653 		if (have_match) {
3654 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3655 			s->matched_entry = entry;
3656 			break;
3657 		}
3658 
3659 		s->search_entry = entry;
3660 		if (view->searching == TOG_SEARCH_FORWARD)
3661 			entry = TAILQ_NEXT(entry, entry);
3662 		else
3663 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3664 	}
3665 
3666 	if (s->matched_entry) {
3667 		int cur = s->selected_entry->idx;
3668 		while (cur < s->matched_entry->idx) {
3669 			err = input_log_view(NULL, view, KEY_DOWN);
3670 			if (err)
3671 				return err;
3672 			cur++;
3673 		}
3674 		while (cur > s->matched_entry->idx) {
3675 			err = input_log_view(NULL, view, KEY_UP);
3676 			if (err)
3677 				return err;
3678 			cur--;
3679 		}
3680 	}
3681 
3682 	s->search_entry = NULL;
3683 
3684 	return NULL;
3685 }
3686 
3687 static const struct got_error *
3688 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3689     struct got_repository *repo, const char *head_ref_name,
3690     const char *in_repo_path, int log_branches)
3691 {
3692 	const struct got_error *err = NULL;
3693 	struct tog_log_view_state *s = &view->state.log;
3694 	struct got_repository *thread_repo = NULL;
3695 	struct got_commit_graph *thread_graph = NULL;
3696 	int errcode;
3697 
3698 	if (in_repo_path != s->in_repo_path) {
3699 		free(s->in_repo_path);
3700 		s->in_repo_path = strdup(in_repo_path);
3701 		if (s->in_repo_path == NULL) {
3702 			err = got_error_from_errno("strdup");
3703 			goto done;
3704 		}
3705 	}
3706 
3707 	/* The commit queue only contains commits being displayed. */
3708 	TAILQ_INIT(&s->real_commits.head);
3709 	s->real_commits.ncommits = 0;
3710 	s->commits = &s->real_commits;
3711 
3712 	TAILQ_INIT(&s->limit_commits.head);
3713 	s->limit_view = 0;
3714 	s->limit_commits.ncommits = 0;
3715 
3716 	s->repo = repo;
3717 	if (head_ref_name) {
3718 		s->head_ref_name = strdup(head_ref_name);
3719 		if (s->head_ref_name == NULL) {
3720 			err = got_error_from_errno("strdup");
3721 			goto done;
3722 		}
3723 	}
3724 	s->start_id = got_object_id_dup(start_id);
3725 	if (s->start_id == NULL) {
3726 		err = got_error_from_errno("got_object_id_dup");
3727 		goto done;
3728 	}
3729 	s->log_branches = log_branches;
3730 	s->use_committer = 1;
3731 
3732 	STAILQ_INIT(&s->colors);
3733 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3734 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3735 		    get_color_value("TOG_COLOR_COMMIT"));
3736 		if (err)
3737 			goto done;
3738 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3739 		    get_color_value("TOG_COLOR_AUTHOR"));
3740 		if (err) {
3741 			free_colors(&s->colors);
3742 			goto done;
3743 		}
3744 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3745 		    get_color_value("TOG_COLOR_DATE"));
3746 		if (err) {
3747 			free_colors(&s->colors);
3748 			goto done;
3749 		}
3750 	}
3751 
3752 	view->show = show_log_view;
3753 	view->input = input_log_view;
3754 	view->resize = resize_log_view;
3755 	view->close = close_log_view;
3756 	view->search_start = search_start_log_view;
3757 	view->search_next = search_next_log_view;
3758 
3759 	if (s->thread_args.pack_fds == NULL) {
3760 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3761 		if (err)
3762 			goto done;
3763 	}
3764 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3765 	    s->thread_args.pack_fds);
3766 	if (err)
3767 		goto done;
3768 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3769 	    !s->log_branches);
3770 	if (err)
3771 		goto done;
3772 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3773 	    s->repo, NULL, NULL);
3774 	if (err)
3775 		goto done;
3776 
3777 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3778 	if (errcode) {
3779 		err = got_error_set_errno(errcode, "pthread_cond_init");
3780 		goto done;
3781 	}
3782 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3783 	if (errcode) {
3784 		err = got_error_set_errno(errcode, "pthread_cond_init");
3785 		goto done;
3786 	}
3787 
3788 	s->thread_args.commits_needed = view->nlines;
3789 	s->thread_args.graph = thread_graph;
3790 	s->thread_args.real_commits = &s->real_commits;
3791 	s->thread_args.limit_commits = &s->limit_commits;
3792 	s->thread_args.in_repo_path = s->in_repo_path;
3793 	s->thread_args.start_id = s->start_id;
3794 	s->thread_args.repo = thread_repo;
3795 	s->thread_args.log_complete = 0;
3796 	s->thread_args.quit = &s->quit;
3797 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3798 	s->thread_args.selected_entry = &s->selected_entry;
3799 	s->thread_args.searching = &view->searching;
3800 	s->thread_args.search_next_done = &view->search_next_done;
3801 	s->thread_args.regex = &view->regex;
3802 	s->thread_args.limiting = &s->limit_view;
3803 	s->thread_args.limit_regex = &s->limit_regex;
3804 	s->thread_args.limit_commits = &s->limit_commits;
3805 done:
3806 	if (err) {
3807 		if (view->close == NULL)
3808 			close_log_view(view);
3809 		view_close(view);
3810 	}
3811 	return err;
3812 }
3813 
3814 static const struct got_error *
3815 show_log_view(struct tog_view *view)
3816 {
3817 	const struct got_error *err;
3818 	struct tog_log_view_state *s = &view->state.log;
3819 
3820 	if (s->thread == 0) { //NULL) {
3821 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3822 		    &s->thread_args);
3823 		if (errcode)
3824 			return got_error_set_errno(errcode, "pthread_create");
3825 		if (s->thread_args.commits_needed > 0) {
3826 			err = trigger_log_thread(view, 1);
3827 			if (err)
3828 				return err;
3829 		}
3830 	}
3831 
3832 	return draw_commits(view);
3833 }
3834 
3835 static void
3836 log_move_cursor_up(struct tog_view *view, int page, int home)
3837 {
3838 	struct tog_log_view_state *s = &view->state.log;
3839 
3840 	if (s->first_displayed_entry == NULL)
3841 		return;
3842 	if (s->selected_entry->idx == 0)
3843 		view->count = 0;
3844 
3845 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3846 	    || home)
3847 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3848 
3849 	if (!page && !home && s->selected > 0)
3850 		--s->selected;
3851 	else
3852 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3853 
3854 	select_commit(s);
3855 	return;
3856 }
3857 
3858 static const struct got_error *
3859 log_move_cursor_down(struct tog_view *view, int page)
3860 {
3861 	struct tog_log_view_state	*s = &view->state.log;
3862 	const struct got_error		*err = NULL;
3863 	int				 eos = view->nlines - 2;
3864 
3865 	if (s->first_displayed_entry == NULL)
3866 		return NULL;
3867 
3868 	if (s->thread_args.log_complete &&
3869 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3870 		return NULL;
3871 
3872 	if (view_is_hsplit_top(view))
3873 		--eos;  /* border consumes the last line */
3874 
3875 	if (!page) {
3876 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3877 			++s->selected;
3878 		else
3879 			err = log_scroll_down(view, 1);
3880 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3881 		struct commit_queue_entry *entry;
3882 		int n;
3883 
3884 		s->selected = 0;
3885 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3886 		s->last_displayed_entry = entry;
3887 		for (n = 0; n <= eos; n++) {
3888 			if (entry == NULL)
3889 				break;
3890 			s->first_displayed_entry = entry;
3891 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3892 		}
3893 		if (n > 0)
3894 			s->selected = n - 1;
3895 	} else {
3896 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3897 		    s->thread_args.log_complete)
3898 			s->selected += MIN(page,
3899 			    s->commits->ncommits - s->selected_entry->idx - 1);
3900 		else
3901 			err = log_scroll_down(view, page);
3902 	}
3903 	if (err)
3904 		return err;
3905 
3906 	/*
3907 	 * We might necessarily overshoot in horizontal
3908 	 * splits; if so, select the last displayed commit.
3909 	 */
3910 	if (s->first_displayed_entry && s->last_displayed_entry) {
3911 		s->selected = MIN(s->selected,
3912 		    s->last_displayed_entry->idx -
3913 		    s->first_displayed_entry->idx);
3914 	}
3915 
3916 	select_commit(s);
3917 
3918 	if (s->thread_args.log_complete &&
3919 	    s->selected_entry->idx == s->commits->ncommits - 1)
3920 		view->count = 0;
3921 
3922 	return NULL;
3923 }
3924 
3925 static void
3926 view_get_split(struct tog_view *view, int *y, int *x)
3927 {
3928 	*x = 0;
3929 	*y = 0;
3930 
3931 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3932 		if (view->child && view->child->resized_y)
3933 			*y = view->child->resized_y;
3934 		else if (view->resized_y)
3935 			*y = view->resized_y;
3936 		else
3937 			*y = view_split_begin_y(view->lines);
3938 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3939 		if (view->child && view->child->resized_x)
3940 			*x = view->child->resized_x;
3941 		else if (view->resized_x)
3942 			*x = view->resized_x;
3943 		else
3944 			*x = view_split_begin_x(view->begin_x);
3945 	}
3946 }
3947 
3948 /* Split view horizontally at y and offset view->state->selected line. */
3949 static const struct got_error *
3950 view_init_hsplit(struct tog_view *view, int y)
3951 {
3952 	const struct got_error *err = NULL;
3953 
3954 	view->nlines = y;
3955 	view->ncols = COLS;
3956 	err = view_resize(view);
3957 	if (err)
3958 		return err;
3959 
3960 	err = offset_selection_down(view);
3961 
3962 	return err;
3963 }
3964 
3965 static const struct got_error *
3966 log_goto_line(struct tog_view *view, int nlines)
3967 {
3968 	const struct got_error		*err = NULL;
3969 	struct tog_log_view_state	*s = &view->state.log;
3970 	int				 g, idx = s->selected_entry->idx;
3971 
3972 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3973 		return NULL;
3974 
3975 	g = view->gline;
3976 	view->gline = 0;
3977 
3978 	if (g >= s->first_displayed_entry->idx + 1 &&
3979 	    g <= s->last_displayed_entry->idx + 1 &&
3980 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3981 		s->selected = g - s->first_displayed_entry->idx - 1;
3982 		select_commit(s);
3983 		return NULL;
3984 	}
3985 
3986 	if (idx + 1 < g) {
3987 		err = log_move_cursor_down(view, g - idx - 1);
3988 		if (!err && g > s->selected_entry->idx + 1)
3989 			err = log_move_cursor_down(view,
3990 			    g - s->first_displayed_entry->idx - 1);
3991 		if (err)
3992 			return err;
3993 	} else if (idx + 1 > g)
3994 		log_move_cursor_up(view, idx - g + 1, 0);
3995 
3996 	if (g < nlines && s->first_displayed_entry->idx == 0)
3997 		s->selected = g - 1;
3998 
3999 	select_commit(s);
4000 	return NULL;
4001 
4002 }
4003 
4004 static void
4005 horizontal_scroll_input(struct tog_view *view, int ch)
4006 {
4007 
4008 	switch (ch) {
4009 	case KEY_LEFT:
4010 	case 'h':
4011 		view->x -= MIN(view->x, 2);
4012 		if (view->x <= 0)
4013 			view->count = 0;
4014 		break;
4015 	case KEY_RIGHT:
4016 	case 'l':
4017 		if (view->x + view->ncols / 2 < view->maxx)
4018 			view->x += 2;
4019 		else
4020 			view->count = 0;
4021 		break;
4022 	case '0':
4023 		view->x = 0;
4024 		break;
4025 	case '$':
4026 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4027 		view->count = 0;
4028 		break;
4029 	default:
4030 		break;
4031 	}
4032 }
4033 
4034 static const struct got_error *
4035 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4036 {
4037 	const struct got_error *err = NULL;
4038 	struct tog_log_view_state *s = &view->state.log;
4039 	int eos, nscroll;
4040 
4041 	if (s->thread_args.load_all) {
4042 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4043 			s->thread_args.load_all = 0;
4044 		else if (s->thread_args.log_complete) {
4045 			err = log_move_cursor_down(view, s->commits->ncommits);
4046 			s->thread_args.load_all = 0;
4047 		}
4048 		if (err)
4049 			return err;
4050 	}
4051 
4052 	eos = nscroll = view->nlines - 1;
4053 	if (view_is_hsplit_top(view))
4054 		--eos;  /* border */
4055 
4056 	if (view->gline)
4057 		return log_goto_line(view, eos);
4058 
4059 	switch (ch) {
4060 	case '&':
4061 		err = limit_log_view(view);
4062 		break;
4063 	case 'q':
4064 		s->quit = 1;
4065 		break;
4066 	case '0':
4067 	case '$':
4068 	case KEY_RIGHT:
4069 	case 'l':
4070 	case KEY_LEFT:
4071 	case 'h':
4072 		horizontal_scroll_input(view, ch);
4073 		break;
4074 	case 'k':
4075 	case KEY_UP:
4076 	case '<':
4077 	case ',':
4078 	case CTRL('p'):
4079 		log_move_cursor_up(view, 0, 0);
4080 		break;
4081 	case 'g':
4082 	case '=':
4083 	case KEY_HOME:
4084 		log_move_cursor_up(view, 0, 1);
4085 		view->count = 0;
4086 		break;
4087 	case CTRL('u'):
4088 	case 'u':
4089 		nscroll /= 2;
4090 		/* FALL THROUGH */
4091 	case KEY_PPAGE:
4092 	case CTRL('b'):
4093 	case 'b':
4094 		log_move_cursor_up(view, nscroll, 0);
4095 		break;
4096 	case 'j':
4097 	case KEY_DOWN:
4098 	case '>':
4099 	case '.':
4100 	case CTRL('n'):
4101 		err = log_move_cursor_down(view, 0);
4102 		break;
4103 	case '@':
4104 		s->use_committer = !s->use_committer;
4105 		view->action = s->use_committer ?
4106 		    "show committer" : "show commit author";
4107 		break;
4108 	case 'G':
4109 	case '*':
4110 	case KEY_END: {
4111 		/* We don't know yet how many commits, so we're forced to
4112 		 * traverse them all. */
4113 		view->count = 0;
4114 		s->thread_args.load_all = 1;
4115 		if (!s->thread_args.log_complete)
4116 			return trigger_log_thread(view, 0);
4117 		err = log_move_cursor_down(view, s->commits->ncommits);
4118 		s->thread_args.load_all = 0;
4119 		break;
4120 	}
4121 	case CTRL('d'):
4122 	case 'd':
4123 		nscroll /= 2;
4124 		/* FALL THROUGH */
4125 	case KEY_NPAGE:
4126 	case CTRL('f'):
4127 	case 'f':
4128 	case ' ':
4129 		err = log_move_cursor_down(view, nscroll);
4130 		break;
4131 	case KEY_RESIZE:
4132 		if (s->selected > view->nlines - 2)
4133 			s->selected = view->nlines - 2;
4134 		if (s->selected > s->commits->ncommits - 1)
4135 			s->selected = s->commits->ncommits - 1;
4136 		select_commit(s);
4137 		if (s->commits->ncommits < view->nlines - 1 &&
4138 		    !s->thread_args.log_complete) {
4139 			s->thread_args.commits_needed += (view->nlines - 1) -
4140 			    s->commits->ncommits;
4141 			err = trigger_log_thread(view, 1);
4142 		}
4143 		break;
4144 	case KEY_ENTER:
4145 	case '\r':
4146 		view->count = 0;
4147 		if (s->selected_entry == NULL)
4148 			break;
4149 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4150 		break;
4151 	case 'T':
4152 		view->count = 0;
4153 		if (s->selected_entry == NULL)
4154 			break;
4155 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4156 		break;
4157 	case KEY_BACKSPACE:
4158 	case CTRL('l'):
4159 	case 'B':
4160 		view->count = 0;
4161 		if (ch == KEY_BACKSPACE &&
4162 		    got_path_is_root_dir(s->in_repo_path))
4163 			break;
4164 		err = stop_log_thread(s);
4165 		if (err)
4166 			return err;
4167 		if (ch == KEY_BACKSPACE) {
4168 			char *parent_path;
4169 			err = got_path_dirname(&parent_path, s->in_repo_path);
4170 			if (err)
4171 				return err;
4172 			free(s->in_repo_path);
4173 			s->in_repo_path = parent_path;
4174 			s->thread_args.in_repo_path = s->in_repo_path;
4175 		} else if (ch == CTRL('l')) {
4176 			struct got_object_id *start_id;
4177 			err = got_repo_match_object_id(&start_id, NULL,
4178 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4179 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4180 			if (err) {
4181 				if (s->head_ref_name == NULL ||
4182 				    err->code != GOT_ERR_NOT_REF)
4183 					return err;
4184 				/* Try to cope with deleted references. */
4185 				free(s->head_ref_name);
4186 				s->head_ref_name = NULL;
4187 				err = got_repo_match_object_id(&start_id,
4188 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4189 				    &tog_refs, s->repo);
4190 				if (err)
4191 					return err;
4192 			}
4193 			free(s->start_id);
4194 			s->start_id = start_id;
4195 			s->thread_args.start_id = s->start_id;
4196 		} else /* 'B' */
4197 			s->log_branches = !s->log_branches;
4198 
4199 		if (s->thread_args.pack_fds == NULL) {
4200 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4201 			if (err)
4202 				return err;
4203 		}
4204 		err = got_repo_open(&s->thread_args.repo,
4205 		    got_repo_get_path(s->repo), NULL,
4206 		    s->thread_args.pack_fds);
4207 		if (err)
4208 			return err;
4209 		tog_free_refs();
4210 		err = tog_load_refs(s->repo, 0);
4211 		if (err)
4212 			return err;
4213 		err = got_commit_graph_open(&s->thread_args.graph,
4214 		    s->in_repo_path, !s->log_branches);
4215 		if (err)
4216 			return err;
4217 		err = got_commit_graph_iter_start(s->thread_args.graph,
4218 		    s->start_id, s->repo, NULL, NULL);
4219 		if (err)
4220 			return err;
4221 		free_commits(&s->real_commits);
4222 		free_commits(&s->limit_commits);
4223 		s->first_displayed_entry = NULL;
4224 		s->last_displayed_entry = NULL;
4225 		s->selected_entry = NULL;
4226 		s->selected = 0;
4227 		s->thread_args.log_complete = 0;
4228 		s->quit = 0;
4229 		s->thread_args.commits_needed = view->lines;
4230 		s->matched_entry = NULL;
4231 		s->search_entry = NULL;
4232 		view->offset = 0;
4233 		break;
4234 	case 'R':
4235 		view->count = 0;
4236 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4237 		break;
4238 	default:
4239 		view->count = 0;
4240 		break;
4241 	}
4242 
4243 	return err;
4244 }
4245 
4246 static const struct got_error *
4247 apply_unveil(const char *repo_path, const char *worktree_path)
4248 {
4249 	const struct got_error *error;
4250 
4251 #ifdef PROFILE
4252 	if (unveil("gmon.out", "rwc") != 0)
4253 		return got_error_from_errno2("unveil", "gmon.out");
4254 #endif
4255 	if (repo_path && unveil(repo_path, "r") != 0)
4256 		return got_error_from_errno2("unveil", repo_path);
4257 
4258 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4259 		return got_error_from_errno2("unveil", worktree_path);
4260 
4261 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4262 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4263 
4264 	error = got_privsep_unveil_exec_helpers();
4265 	if (error != NULL)
4266 		return error;
4267 
4268 	if (unveil(NULL, NULL) != 0)
4269 		return got_error_from_errno("unveil");
4270 
4271 	return NULL;
4272 }
4273 
4274 static const struct got_error *
4275 init_mock_term(const char *test_script_path)
4276 {
4277 	const struct got_error	*err = NULL;
4278 	const char *screen_dump_path;
4279 	int in;
4280 
4281 	if (test_script_path == NULL || *test_script_path == '\0')
4282 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4283 
4284 	tog_io.f = fopen(test_script_path, "re");
4285 	if (tog_io.f == NULL) {
4286 		err = got_error_from_errno_fmt("fopen: %s",
4287 		    test_script_path);
4288 		goto done;
4289 	}
4290 
4291 	/* test mode, we don't want any output */
4292 	tog_io.cout = fopen("/dev/null", "w+");
4293 	if (tog_io.cout == NULL) {
4294 		err = got_error_from_errno2("fopen", "/dev/null");
4295 		goto done;
4296 	}
4297 
4298 	in = dup(fileno(tog_io.cout));
4299 	if (in == -1) {
4300 		err = got_error_from_errno("dup");
4301 		goto done;
4302 	}
4303 	tog_io.cin = fdopen(in, "r");
4304 	if (tog_io.cin == NULL) {
4305 		err = got_error_from_errno("fdopen");
4306 		close(in);
4307 		goto done;
4308 	}
4309 
4310 	screen_dump_path = getenv("TOG_SCR_DUMP");
4311 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4312 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4313 	tog_io.sdump = fopen(screen_dump_path, "wex");
4314 	if (tog_io.sdump == NULL) {
4315 		err = got_error_from_errno2("fopen", screen_dump_path);
4316 		goto done;
4317 	}
4318 
4319 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4320 		err = got_error_from_errno("fseeko");
4321 		goto done;
4322 	}
4323 
4324 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4325 		err = got_error_msg(GOT_ERR_IO,
4326 		    "newterm: failed to initialise curses");
4327 
4328 	using_mock_io = 1;
4329 
4330 done:
4331 	if (err)
4332 		tog_io_close();
4333 	return err;
4334 }
4335 
4336 static void
4337 init_curses(void)
4338 {
4339 	/*
4340 	 * Override default signal handlers before starting ncurses.
4341 	 * This should prevent ncurses from installing its own
4342 	 * broken cleanup() signal handler.
4343 	 */
4344 	signal(SIGWINCH, tog_sigwinch);
4345 	signal(SIGPIPE, tog_sigpipe);
4346 	signal(SIGCONT, tog_sigcont);
4347 	signal(SIGINT, tog_sigint);
4348 	signal(SIGTERM, tog_sigterm);
4349 
4350 	if (using_mock_io) /* In test mode we use a fake terminal */
4351 		return;
4352 
4353 	initscr();
4354 
4355 	cbreak();
4356 	halfdelay(1); /* Fast refresh while initial view is loading. */
4357 	noecho();
4358 	nonl();
4359 	intrflush(stdscr, FALSE);
4360 	keypad(stdscr, TRUE);
4361 	curs_set(0);
4362 	if (getenv("TOG_COLORS") != NULL) {
4363 		start_color();
4364 		use_default_colors();
4365 	}
4366 
4367 	return;
4368 }
4369 
4370 static const struct got_error *
4371 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4372     struct got_repository *repo, struct got_worktree *worktree)
4373 {
4374 	const struct got_error *err = NULL;
4375 
4376 	if (argc == 0) {
4377 		*in_repo_path = strdup("/");
4378 		if (*in_repo_path == NULL)
4379 			return got_error_from_errno("strdup");
4380 		return NULL;
4381 	}
4382 
4383 	if (worktree) {
4384 		const char *prefix = got_worktree_get_path_prefix(worktree);
4385 		char *p;
4386 
4387 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4388 		if (err)
4389 			return err;
4390 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4391 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4392 		    p) == -1) {
4393 			err = got_error_from_errno("asprintf");
4394 			*in_repo_path = NULL;
4395 		}
4396 		free(p);
4397 	} else
4398 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4399 
4400 	return err;
4401 }
4402 
4403 static const struct got_error *
4404 cmd_log(int argc, char *argv[])
4405 {
4406 	const struct got_error *error;
4407 	struct got_repository *repo = NULL;
4408 	struct got_worktree *worktree = NULL;
4409 	struct got_object_id *start_id = NULL;
4410 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4411 	char *start_commit = NULL, *label = NULL;
4412 	struct got_reference *ref = NULL;
4413 	const char *head_ref_name = NULL;
4414 	int ch, log_branches = 0;
4415 	struct tog_view *view;
4416 	int *pack_fds = NULL;
4417 
4418 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4419 		switch (ch) {
4420 		case 'b':
4421 			log_branches = 1;
4422 			break;
4423 		case 'c':
4424 			start_commit = optarg;
4425 			break;
4426 		case 'r':
4427 			repo_path = realpath(optarg, NULL);
4428 			if (repo_path == NULL)
4429 				return got_error_from_errno2("realpath",
4430 				    optarg);
4431 			break;
4432 		default:
4433 			usage_log();
4434 			/* NOTREACHED */
4435 		}
4436 	}
4437 
4438 	argc -= optind;
4439 	argv += optind;
4440 
4441 	if (argc > 1)
4442 		usage_log();
4443 
4444 	error = got_repo_pack_fds_open(&pack_fds);
4445 	if (error != NULL)
4446 		goto done;
4447 
4448 	if (repo_path == NULL) {
4449 		cwd = getcwd(NULL, 0);
4450 		if (cwd == NULL)
4451 			return got_error_from_errno("getcwd");
4452 		error = got_worktree_open(&worktree, cwd);
4453 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4454 			goto done;
4455 		if (worktree)
4456 			repo_path =
4457 			    strdup(got_worktree_get_repo_path(worktree));
4458 		else
4459 			repo_path = strdup(cwd);
4460 		if (repo_path == NULL) {
4461 			error = got_error_from_errno("strdup");
4462 			goto done;
4463 		}
4464 	}
4465 
4466 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4467 	if (error != NULL)
4468 		goto done;
4469 
4470 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4471 	    repo, worktree);
4472 	if (error)
4473 		goto done;
4474 
4475 	init_curses();
4476 
4477 	error = apply_unveil(got_repo_get_path(repo),
4478 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4479 	if (error)
4480 		goto done;
4481 
4482 	/* already loaded by tog_log_with_path()? */
4483 	if (TAILQ_EMPTY(&tog_refs)) {
4484 		error = tog_load_refs(repo, 0);
4485 		if (error)
4486 			goto done;
4487 	}
4488 
4489 	if (start_commit == NULL) {
4490 		error = got_repo_match_object_id(&start_id, &label,
4491 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4492 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4493 		if (error)
4494 			goto done;
4495 		head_ref_name = label;
4496 	} else {
4497 		error = got_ref_open(&ref, repo, start_commit, 0);
4498 		if (error == NULL)
4499 			head_ref_name = got_ref_get_name(ref);
4500 		else if (error->code != GOT_ERR_NOT_REF)
4501 			goto done;
4502 		error = got_repo_match_object_id(&start_id, NULL,
4503 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4504 		if (error)
4505 			goto done;
4506 	}
4507 
4508 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4509 	if (view == NULL) {
4510 		error = got_error_from_errno("view_open");
4511 		goto done;
4512 	}
4513 	error = open_log_view(view, start_id, repo, head_ref_name,
4514 	    in_repo_path, log_branches);
4515 	if (error)
4516 		goto done;
4517 	if (worktree) {
4518 		/* Release work tree lock. */
4519 		got_worktree_close(worktree);
4520 		worktree = NULL;
4521 	}
4522 	error = view_loop(view);
4523 done:
4524 	free(in_repo_path);
4525 	free(repo_path);
4526 	free(cwd);
4527 	free(start_id);
4528 	free(label);
4529 	if (ref)
4530 		got_ref_close(ref);
4531 	if (repo) {
4532 		const struct got_error *close_err = got_repo_close(repo);
4533 		if (error == NULL)
4534 			error = close_err;
4535 	}
4536 	if (worktree)
4537 		got_worktree_close(worktree);
4538 	if (pack_fds) {
4539 		const struct got_error *pack_err =
4540 		    got_repo_pack_fds_close(pack_fds);
4541 		if (error == NULL)
4542 			error = pack_err;
4543 	}
4544 	tog_free_refs();
4545 	return error;
4546 }
4547 
4548 __dead static void
4549 usage_diff(void)
4550 {
4551 	endwin();
4552 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4553 	    "object1 object2\n", getprogname());
4554 	exit(1);
4555 }
4556 
4557 static int
4558 match_line(const char *line, regex_t *regex, size_t nmatch,
4559     regmatch_t *regmatch)
4560 {
4561 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4562 }
4563 
4564 static struct tog_color *
4565 match_color(struct tog_colors *colors, const char *line)
4566 {
4567 	struct tog_color *tc = NULL;
4568 
4569 	STAILQ_FOREACH(tc, colors, entry) {
4570 		if (match_line(line, &tc->regex, 0, NULL))
4571 			return tc;
4572 	}
4573 
4574 	return NULL;
4575 }
4576 
4577 static const struct got_error *
4578 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4579     WINDOW *window, int skipcol, regmatch_t *regmatch)
4580 {
4581 	const struct got_error *err = NULL;
4582 	char *exstr = NULL;
4583 	wchar_t *wline = NULL;
4584 	int rme, rms, n, width, scrollx;
4585 	int width0 = 0, width1 = 0, width2 = 0;
4586 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4587 
4588 	*wtotal = 0;
4589 
4590 	rms = regmatch->rm_so;
4591 	rme = regmatch->rm_eo;
4592 
4593 	err = expand_tab(&exstr, line);
4594 	if (err)
4595 		return err;
4596 
4597 	/* Split the line into 3 segments, according to match offsets. */
4598 	seg0 = strndup(exstr, rms);
4599 	if (seg0 == NULL) {
4600 		err = got_error_from_errno("strndup");
4601 		goto done;
4602 	}
4603 	seg1 = strndup(exstr + rms, rme - rms);
4604 	if (seg1 == NULL) {
4605 		err = got_error_from_errno("strndup");
4606 		goto done;
4607 	}
4608 	seg2 = strdup(exstr + rme);
4609 	if (seg2 == NULL) {
4610 		err = got_error_from_errno("strndup");
4611 		goto done;
4612 	}
4613 
4614 	/* draw up to matched token if we haven't scrolled past it */
4615 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4616 	    col_tab_align, 1);
4617 	if (err)
4618 		goto done;
4619 	n = MAX(width0 - skipcol, 0);
4620 	if (n) {
4621 		free(wline);
4622 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4623 		    wlimit, col_tab_align, 1);
4624 		if (err)
4625 			goto done;
4626 		waddwstr(window, &wline[scrollx]);
4627 		wlimit -= width;
4628 		*wtotal += width;
4629 	}
4630 
4631 	if (wlimit > 0) {
4632 		int i = 0, w = 0;
4633 		size_t wlen;
4634 
4635 		free(wline);
4636 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4637 		    col_tab_align, 1);
4638 		if (err)
4639 			goto done;
4640 		wlen = wcslen(wline);
4641 		while (i < wlen) {
4642 			width = wcwidth(wline[i]);
4643 			if (width == -1) {
4644 				/* should not happen, tabs are expanded */
4645 				err = got_error(GOT_ERR_RANGE);
4646 				goto done;
4647 			}
4648 			if (width0 + w + width > skipcol)
4649 				break;
4650 			w += width;
4651 			i++;
4652 		}
4653 		/* draw (visible part of) matched token (if scrolled into it) */
4654 		if (width1 - w > 0) {
4655 			wattron(window, A_STANDOUT);
4656 			waddwstr(window, &wline[i]);
4657 			wattroff(window, A_STANDOUT);
4658 			wlimit -= (width1 - w);
4659 			*wtotal += (width1 - w);
4660 		}
4661 	}
4662 
4663 	if (wlimit > 0) {  /* draw rest of line */
4664 		free(wline);
4665 		if (skipcol > width0 + width1) {
4666 			err = format_line(&wline, &width2, &scrollx, seg2,
4667 			    skipcol - (width0 + width1), wlimit,
4668 			    col_tab_align, 1);
4669 			if (err)
4670 				goto done;
4671 			waddwstr(window, &wline[scrollx]);
4672 		} else {
4673 			err = format_line(&wline, &width2, NULL, seg2, 0,
4674 			    wlimit, col_tab_align, 1);
4675 			if (err)
4676 				goto done;
4677 			waddwstr(window, wline);
4678 		}
4679 		*wtotal += width2;
4680 	}
4681 done:
4682 	free(wline);
4683 	free(exstr);
4684 	free(seg0);
4685 	free(seg1);
4686 	free(seg2);
4687 	return err;
4688 }
4689 
4690 static int
4691 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4692 {
4693 	FILE	*f = NULL;
4694 	int	*eof, *first, *selected;
4695 
4696 	if (view->type == TOG_VIEW_DIFF) {
4697 		struct tog_diff_view_state *s = &view->state.diff;
4698 
4699 		first = &s->first_displayed_line;
4700 		selected = first;
4701 		eof = &s->eof;
4702 		f = s->f;
4703 	} else if (view->type == TOG_VIEW_HELP) {
4704 		struct tog_help_view_state *s = &view->state.help;
4705 
4706 		first = &s->first_displayed_line;
4707 		selected = first;
4708 		eof = &s->eof;
4709 		f = s->f;
4710 	} else if (view->type == TOG_VIEW_BLAME) {
4711 		struct tog_blame_view_state *s = &view->state.blame;
4712 
4713 		first = &s->first_displayed_line;
4714 		selected = &s->selected_line;
4715 		eof = &s->eof;
4716 		f = s->blame.f;
4717 	} else
4718 		return 0;
4719 
4720 	/* Center gline in the middle of the page like vi(1). */
4721 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4722 		return 0;
4723 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4724 		rewind(f);
4725 		*eof = 0;
4726 		*first = 1;
4727 		*lineno = 0;
4728 		*nprinted = 0;
4729 		return 0;
4730 	}
4731 
4732 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4733 		view->gline : (view->nlines - 3) / 2 + 1;
4734 	view->gline = 0;
4735 
4736 	return 1;
4737 }
4738 
4739 static const struct got_error *
4740 draw_file(struct tog_view *view, const char *header)
4741 {
4742 	struct tog_diff_view_state *s = &view->state.diff;
4743 	regmatch_t *regmatch = &view->regmatch;
4744 	const struct got_error *err;
4745 	int nprinted = 0;
4746 	char *line;
4747 	size_t linesize = 0;
4748 	ssize_t linelen;
4749 	wchar_t *wline;
4750 	int width;
4751 	int max_lines = view->nlines;
4752 	int nlines = s->nlines;
4753 	off_t line_offset;
4754 
4755 	s->lineno = s->first_displayed_line - 1;
4756 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4757 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4758 		return got_error_from_errno("fseek");
4759 
4760 	werase(view->window);
4761 
4762 	if (view->gline > s->nlines - 1)
4763 		view->gline = s->nlines - 1;
4764 
4765 	if (header) {
4766 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4767 		    1 : view->gline - (view->nlines - 3) / 2 :
4768 		    s->lineno + s->selected_line;
4769 
4770 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4771 			return got_error_from_errno("asprintf");
4772 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4773 		    0, 0);
4774 		free(line);
4775 		if (err)
4776 			return err;
4777 
4778 		if (view_needs_focus_indication(view))
4779 			wstandout(view->window);
4780 		waddwstr(view->window, wline);
4781 		free(wline);
4782 		wline = NULL;
4783 		while (width++ < view->ncols)
4784 			waddch(view->window, ' ');
4785 		if (view_needs_focus_indication(view))
4786 			wstandend(view->window);
4787 
4788 		if (max_lines <= 1)
4789 			return NULL;
4790 		max_lines--;
4791 	}
4792 
4793 	s->eof = 0;
4794 	view->maxx = 0;
4795 	line = NULL;
4796 	while (max_lines > 0 && nprinted < max_lines) {
4797 		enum got_diff_line_type linetype;
4798 		attr_t attr = 0;
4799 
4800 		linelen = getline(&line, &linesize, s->f);
4801 		if (linelen == -1) {
4802 			if (feof(s->f)) {
4803 				s->eof = 1;
4804 				break;
4805 			}
4806 			free(line);
4807 			return got_ferror(s->f, GOT_ERR_IO);
4808 		}
4809 
4810 		if (++s->lineno < s->first_displayed_line)
4811 			continue;
4812 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4813 			continue;
4814 		if (s->lineno == view->hiline)
4815 			attr = A_STANDOUT;
4816 
4817 		/* Set view->maxx based on full line length. */
4818 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4819 		    view->x ? 1 : 0);
4820 		if (err) {
4821 			free(line);
4822 			return err;
4823 		}
4824 		view->maxx = MAX(view->maxx, width);
4825 		free(wline);
4826 		wline = NULL;
4827 
4828 		linetype = s->lines[s->lineno].type;
4829 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4830 		    linetype < GOT_DIFF_LINE_CONTEXT)
4831 			attr |= COLOR_PAIR(linetype);
4832 		if (attr)
4833 			wattron(view->window, attr);
4834 		if (s->first_displayed_line + nprinted == s->matched_line &&
4835 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4836 			err = add_matched_line(&width, line, view->ncols, 0,
4837 			    view->window, view->x, regmatch);
4838 			if (err) {
4839 				free(line);
4840 				return err;
4841 			}
4842 		} else {
4843 			int skip;
4844 			err = format_line(&wline, &width, &skip, line,
4845 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4846 			if (err) {
4847 				free(line);
4848 				return err;
4849 			}
4850 			waddwstr(view->window, &wline[skip]);
4851 			free(wline);
4852 			wline = NULL;
4853 		}
4854 		if (s->lineno == view->hiline) {
4855 			/* highlight full gline length */
4856 			while (width++ < view->ncols)
4857 				waddch(view->window, ' ');
4858 		} else {
4859 			if (width <= view->ncols - 1)
4860 				waddch(view->window, '\n');
4861 		}
4862 		if (attr)
4863 			wattroff(view->window, attr);
4864 		if (++nprinted == 1)
4865 			s->first_displayed_line = s->lineno;
4866 	}
4867 	free(line);
4868 	if (nprinted >= 1)
4869 		s->last_displayed_line = s->first_displayed_line +
4870 		    (nprinted - 1);
4871 	else
4872 		s->last_displayed_line = s->first_displayed_line;
4873 
4874 	view_border(view);
4875 
4876 	if (s->eof) {
4877 		while (nprinted < view->nlines) {
4878 			waddch(view->window, '\n');
4879 			nprinted++;
4880 		}
4881 
4882 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4883 		    view->ncols, 0, 0);
4884 		if (err) {
4885 			return err;
4886 		}
4887 
4888 		wstandout(view->window);
4889 		waddwstr(view->window, wline);
4890 		free(wline);
4891 		wline = NULL;
4892 		wstandend(view->window);
4893 	}
4894 
4895 	return NULL;
4896 }
4897 
4898 static char *
4899 get_datestr(time_t *time, char *datebuf)
4900 {
4901 	struct tm mytm, *tm;
4902 	char *p, *s;
4903 
4904 	tm = gmtime_r(time, &mytm);
4905 	if (tm == NULL)
4906 		return NULL;
4907 	s = asctime_r(tm, datebuf);
4908 	if (s == NULL)
4909 		return NULL;
4910 	p = strchr(s, '\n');
4911 	if (p)
4912 		*p = '\0';
4913 	return s;
4914 }
4915 
4916 static const struct got_error *
4917 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4918     off_t off, uint8_t type)
4919 {
4920 	struct got_diff_line *p;
4921 
4922 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4923 	if (p == NULL)
4924 		return got_error_from_errno("reallocarray");
4925 	*lines = p;
4926 	(*lines)[*nlines].offset = off;
4927 	(*lines)[*nlines].type = type;
4928 	(*nlines)++;
4929 
4930 	return NULL;
4931 }
4932 
4933 static const struct got_error *
4934 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4935     struct got_diff_line *s_lines, size_t s_nlines)
4936 {
4937 	struct got_diff_line	*p;
4938 	char			 buf[BUFSIZ];
4939 	size_t			 i, r;
4940 
4941 	if (fseeko(src, 0L, SEEK_SET) == -1)
4942 		return got_error_from_errno("fseeko");
4943 
4944 	for (;;) {
4945 		r = fread(buf, 1, sizeof(buf), src);
4946 		if (r == 0) {
4947 			if (ferror(src))
4948 				return got_error_from_errno("fread");
4949 			if (feof(src))
4950 				break;
4951 		}
4952 		if (fwrite(buf, 1, r, dst) != r)
4953 			return got_ferror(dst, GOT_ERR_IO);
4954 	}
4955 
4956 	if (s_nlines == 0 && *d_nlines == 0)
4957 		return NULL;
4958 
4959 	/*
4960 	 * If commit info was in dst, increment line offsets
4961 	 * of the appended diff content, but skip s_lines[0]
4962 	 * because offset zero is already in *d_lines.
4963 	 */
4964 	if (*d_nlines > 0) {
4965 		for (i = 1; i < s_nlines; ++i)
4966 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4967 
4968 		if (s_nlines > 0) {
4969 			--s_nlines;
4970 			++s_lines;
4971 		}
4972 	}
4973 
4974 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4975 	if (p == NULL) {
4976 		/* d_lines is freed in close_diff_view() */
4977 		return got_error_from_errno("reallocarray");
4978 	}
4979 
4980 	*d_lines = p;
4981 
4982 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4983 	*d_nlines += s_nlines;
4984 
4985 	return NULL;
4986 }
4987 
4988 static const struct got_error *
4989 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4990     struct got_object_id *commit_id, struct got_reflist_head *refs,
4991     struct got_repository *repo, int ignore_ws, int force_text_diff,
4992     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4993 {
4994 	const struct got_error *err = NULL;
4995 	char datebuf[26], *datestr;
4996 	struct got_commit_object *commit;
4997 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4998 	time_t committer_time;
4999 	const char *author, *committer;
5000 	char *refs_str = NULL;
5001 	struct got_pathlist_entry *pe;
5002 	off_t outoff = 0;
5003 	int n;
5004 
5005 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5006 	if (err)
5007 		return err;
5008 
5009 	err = got_object_open_as_commit(&commit, repo, commit_id);
5010 	if (err)
5011 		return err;
5012 
5013 	err = got_object_id_str(&id_str, commit_id);
5014 	if (err) {
5015 		err = got_error_from_errno("got_object_id_str");
5016 		goto done;
5017 	}
5018 
5019 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5020 	if (err)
5021 		goto done;
5022 
5023 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5024 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5025 	if (n < 0) {
5026 		err = got_error_from_errno("fprintf");
5027 		goto done;
5028 	}
5029 	outoff += n;
5030 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5031 	if (err)
5032 		goto done;
5033 
5034 	n = fprintf(outfile, "from: %s\n",
5035 	    got_object_commit_get_author(commit));
5036 	if (n < 0) {
5037 		err = got_error_from_errno("fprintf");
5038 		goto done;
5039 	}
5040 	outoff += n;
5041 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5042 	if (err)
5043 		goto done;
5044 
5045 	author = got_object_commit_get_author(commit);
5046 	committer = got_object_commit_get_committer(commit);
5047 	if (strcmp(author, committer) != 0) {
5048 		n = fprintf(outfile, "via: %s\n", committer);
5049 		if (n < 0) {
5050 			err = got_error_from_errno("fprintf");
5051 			goto done;
5052 		}
5053 		outoff += n;
5054 		err = add_line_metadata(lines, nlines, outoff,
5055 		    GOT_DIFF_LINE_AUTHOR);
5056 		if (err)
5057 			goto done;
5058 	}
5059 	committer_time = got_object_commit_get_committer_time(commit);
5060 	datestr = get_datestr(&committer_time, datebuf);
5061 	if (datestr) {
5062 		n = fprintf(outfile, "date: %s UTC\n", datestr);
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,
5069 		    GOT_DIFF_LINE_DATE);
5070 		if (err)
5071 			goto done;
5072 	}
5073 	if (got_object_commit_get_nparents(commit) > 1) {
5074 		const struct got_object_id_queue *parent_ids;
5075 		struct got_object_qid *qid;
5076 		int pn = 1;
5077 		parent_ids = got_object_commit_get_parent_ids(commit);
5078 		STAILQ_FOREACH(qid, parent_ids, entry) {
5079 			err = got_object_id_str(&id_str, &qid->id);
5080 			if (err)
5081 				goto done;
5082 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5083 			if (n < 0) {
5084 				err = got_error_from_errno("fprintf");
5085 				goto done;
5086 			}
5087 			outoff += n;
5088 			err = add_line_metadata(lines, nlines, outoff,
5089 			    GOT_DIFF_LINE_META);
5090 			if (err)
5091 				goto done;
5092 			free(id_str);
5093 			id_str = NULL;
5094 		}
5095 	}
5096 
5097 	err = got_object_commit_get_logmsg(&logmsg, commit);
5098 	if (err)
5099 		goto done;
5100 	s = logmsg;
5101 	while ((line = strsep(&s, "\n")) != NULL) {
5102 		n = fprintf(outfile, "%s\n", line);
5103 		if (n < 0) {
5104 			err = got_error_from_errno("fprintf");
5105 			goto done;
5106 		}
5107 		outoff += n;
5108 		err = add_line_metadata(lines, nlines, outoff,
5109 		    GOT_DIFF_LINE_LOGMSG);
5110 		if (err)
5111 			goto done;
5112 	}
5113 
5114 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5115 		struct got_diff_changed_path *cp = pe->data;
5116 		int pad = dsa->max_path_len - pe->path_len + 1;
5117 
5118 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5119 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5120 		    dsa->rm_cols + 1, cp->rm);
5121 		if (n < 0) {
5122 			err = got_error_from_errno("fprintf");
5123 			goto done;
5124 		}
5125 		outoff += n;
5126 		err = add_line_metadata(lines, nlines, outoff,
5127 		    GOT_DIFF_LINE_CHANGES);
5128 		if (err)
5129 			goto done;
5130 	}
5131 
5132 	fputc('\n', outfile);
5133 	outoff++;
5134 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5135 	if (err)
5136 		goto done;
5137 
5138 	n = fprintf(outfile,
5139 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5140 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5141 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5142 	if (n < 0) {
5143 		err = got_error_from_errno("fprintf");
5144 		goto done;
5145 	}
5146 	outoff += n;
5147 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5148 	if (err)
5149 		goto done;
5150 
5151 	fputc('\n', outfile);
5152 	outoff++;
5153 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5154 done:
5155 	free(id_str);
5156 	free(logmsg);
5157 	free(refs_str);
5158 	got_object_commit_close(commit);
5159 	if (err) {
5160 		free(*lines);
5161 		*lines = NULL;
5162 		*nlines = 0;
5163 	}
5164 	return err;
5165 }
5166 
5167 static const struct got_error *
5168 create_diff(struct tog_diff_view_state *s)
5169 {
5170 	const struct got_error *err = NULL;
5171 	FILE *f = NULL, *tmp_diff_file = NULL;
5172 	int obj_type;
5173 	struct got_diff_line *lines = NULL;
5174 	struct got_pathlist_head changed_paths;
5175 
5176 	TAILQ_INIT(&changed_paths);
5177 
5178 	free(s->lines);
5179 	s->lines = malloc(sizeof(*s->lines));
5180 	if (s->lines == NULL)
5181 		return got_error_from_errno("malloc");
5182 	s->nlines = 0;
5183 
5184 	f = got_opentemp();
5185 	if (f == NULL) {
5186 		err = got_error_from_errno("got_opentemp");
5187 		goto done;
5188 	}
5189 	tmp_diff_file = got_opentemp();
5190 	if (tmp_diff_file == NULL) {
5191 		err = got_error_from_errno("got_opentemp");
5192 		goto done;
5193 	}
5194 	if (s->f && fclose(s->f) == EOF) {
5195 		err = got_error_from_errno("fclose");
5196 		goto done;
5197 	}
5198 	s->f = f;
5199 
5200 	if (s->id1)
5201 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5202 	else
5203 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5204 	if (err)
5205 		goto done;
5206 
5207 	switch (obj_type) {
5208 	case GOT_OBJ_TYPE_BLOB:
5209 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5210 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5211 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5212 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5213 		    s->f);
5214 		break;
5215 	case GOT_OBJ_TYPE_TREE:
5216 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5217 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5218 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5219 		    s->force_text_diff, NULL, s->repo, s->f);
5220 		break;
5221 	case GOT_OBJ_TYPE_COMMIT: {
5222 		const struct got_object_id_queue *parent_ids;
5223 		struct got_object_qid *pid;
5224 		struct got_commit_object *commit2;
5225 		struct got_reflist_head *refs;
5226 		size_t nlines = 0;
5227 		struct got_diffstat_cb_arg dsa = {
5228 			0, 0, 0, 0, 0, 0,
5229 			&changed_paths,
5230 			s->ignore_whitespace,
5231 			s->force_text_diff,
5232 			tog_diff_algo
5233 		};
5234 
5235 		lines = malloc(sizeof(*lines));
5236 		if (lines == NULL) {
5237 			err = got_error_from_errno("malloc");
5238 			goto done;
5239 		}
5240 
5241 		/* build diff first in tmp file then append to commit info */
5242 		err = got_diff_objects_as_commits(&lines, &nlines,
5243 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5244 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5245 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5246 		if (err)
5247 			break;
5248 
5249 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5250 		if (err)
5251 			goto done;
5252 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5253 		/* Show commit info if we're diffing to a parent/root commit. */
5254 		if (s->id1 == NULL) {
5255 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5256 			    refs, s->repo, s->ignore_whitespace,
5257 			    s->force_text_diff, &dsa, s->f);
5258 			if (err)
5259 				goto done;
5260 		} else {
5261 			parent_ids = got_object_commit_get_parent_ids(commit2);
5262 			STAILQ_FOREACH(pid, parent_ids, entry) {
5263 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5264 					err = write_commit_info(&s->lines,
5265 					    &s->nlines, s->id2, refs, s->repo,
5266 					    s->ignore_whitespace,
5267 					    s->force_text_diff, &dsa, s->f);
5268 					if (err)
5269 						goto done;
5270 					break;
5271 				}
5272 			}
5273 		}
5274 		got_object_commit_close(commit2);
5275 
5276 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5277 		    lines, nlines);
5278 		break;
5279 	}
5280 	default:
5281 		err = got_error(GOT_ERR_OBJ_TYPE);
5282 		break;
5283 	}
5284 done:
5285 	free(lines);
5286 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5287 	if (s->f && fflush(s->f) != 0 && err == NULL)
5288 		err = got_error_from_errno("fflush");
5289 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5290 		err = got_error_from_errno("fclose");
5291 	return err;
5292 }
5293 
5294 static void
5295 diff_view_indicate_progress(struct tog_view *view)
5296 {
5297 	mvwaddstr(view->window, 0, 0, "diffing...");
5298 	update_panels();
5299 	doupdate();
5300 }
5301 
5302 static const struct got_error *
5303 search_start_diff_view(struct tog_view *view)
5304 {
5305 	struct tog_diff_view_state *s = &view->state.diff;
5306 
5307 	s->matched_line = 0;
5308 	return NULL;
5309 }
5310 
5311 static void
5312 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5313     size_t *nlines, int **first, int **last, int **match, int **selected)
5314 {
5315 	struct tog_diff_view_state *s = &view->state.diff;
5316 
5317 	*f = s->f;
5318 	*nlines = s->nlines;
5319 	*line_offsets = NULL;
5320 	*match = &s->matched_line;
5321 	*first = &s->first_displayed_line;
5322 	*last = &s->last_displayed_line;
5323 	*selected = &s->selected_line;
5324 }
5325 
5326 static const struct got_error *
5327 search_next_view_match(struct tog_view *view)
5328 {
5329 	const struct got_error *err = NULL;
5330 	FILE *f;
5331 	int lineno;
5332 	char *line = NULL;
5333 	size_t linesize = 0;
5334 	ssize_t linelen;
5335 	off_t *line_offsets;
5336 	size_t nlines = 0;
5337 	int *first, *last, *match, *selected;
5338 
5339 	if (!view->search_setup)
5340 		return got_error_msg(GOT_ERR_NOT_IMPL,
5341 		    "view search not supported");
5342 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5343 	    &match, &selected);
5344 
5345 	if (!view->searching) {
5346 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5347 		return NULL;
5348 	}
5349 
5350 	if (*match) {
5351 		if (view->searching == TOG_SEARCH_FORWARD)
5352 			lineno = *first + 1;
5353 		else
5354 			lineno = *first - 1;
5355 	} else
5356 		lineno = *first - 1 + *selected;
5357 
5358 	while (1) {
5359 		off_t offset;
5360 
5361 		if (lineno <= 0 || lineno > nlines) {
5362 			if (*match == 0) {
5363 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5364 				break;
5365 			}
5366 
5367 			if (view->searching == TOG_SEARCH_FORWARD)
5368 				lineno = 1;
5369 			else
5370 				lineno = nlines;
5371 		}
5372 
5373 		offset = view->type == TOG_VIEW_DIFF ?
5374 		    view->state.diff.lines[lineno - 1].offset :
5375 		    line_offsets[lineno - 1];
5376 		if (fseeko(f, offset, SEEK_SET) != 0) {
5377 			free(line);
5378 			return got_error_from_errno("fseeko");
5379 		}
5380 		linelen = getline(&line, &linesize, f);
5381 		if (linelen != -1) {
5382 			char *exstr;
5383 			err = expand_tab(&exstr, line);
5384 			if (err)
5385 				break;
5386 			if (match_line(exstr, &view->regex, 1,
5387 			    &view->regmatch)) {
5388 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5389 				*match = lineno;
5390 				free(exstr);
5391 				break;
5392 			}
5393 			free(exstr);
5394 		}
5395 		if (view->searching == TOG_SEARCH_FORWARD)
5396 			lineno++;
5397 		else
5398 			lineno--;
5399 	}
5400 	free(line);
5401 
5402 	if (*match) {
5403 		*first = *match;
5404 		*selected = 1;
5405 	}
5406 
5407 	return err;
5408 }
5409 
5410 static const struct got_error *
5411 close_diff_view(struct tog_view *view)
5412 {
5413 	const struct got_error *err = NULL;
5414 	struct tog_diff_view_state *s = &view->state.diff;
5415 
5416 	free(s->id1);
5417 	s->id1 = NULL;
5418 	free(s->id2);
5419 	s->id2 = NULL;
5420 	if (s->f && fclose(s->f) == EOF)
5421 		err = got_error_from_errno("fclose");
5422 	s->f = NULL;
5423 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5424 		err = got_error_from_errno("fclose");
5425 	s->f1 = NULL;
5426 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5427 		err = got_error_from_errno("fclose");
5428 	s->f2 = NULL;
5429 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5430 		err = got_error_from_errno("close");
5431 	s->fd1 = -1;
5432 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5433 		err = got_error_from_errno("close");
5434 	s->fd2 = -1;
5435 	free(s->lines);
5436 	s->lines = NULL;
5437 	s->nlines = 0;
5438 	return err;
5439 }
5440 
5441 static const struct got_error *
5442 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5443     struct got_object_id *id2, const char *label1, const char *label2,
5444     int diff_context, int ignore_whitespace, int force_text_diff,
5445     struct tog_view *parent_view, struct got_repository *repo)
5446 {
5447 	const struct got_error *err;
5448 	struct tog_diff_view_state *s = &view->state.diff;
5449 
5450 	memset(s, 0, sizeof(*s));
5451 	s->fd1 = -1;
5452 	s->fd2 = -1;
5453 
5454 	if (id1 != NULL && id2 != NULL) {
5455 		int type1, type2;
5456 
5457 		err = got_object_get_type(&type1, repo, id1);
5458 		if (err)
5459 			goto done;
5460 		err = got_object_get_type(&type2, repo, id2);
5461 		if (err)
5462 			goto done;
5463 
5464 		if (type1 != type2) {
5465 			err = got_error(GOT_ERR_OBJ_TYPE);
5466 			goto done;
5467 		}
5468 	}
5469 	s->first_displayed_line = 1;
5470 	s->last_displayed_line = view->nlines;
5471 	s->selected_line = 1;
5472 	s->repo = repo;
5473 	s->id1 = id1;
5474 	s->id2 = id2;
5475 	s->label1 = label1;
5476 	s->label2 = label2;
5477 
5478 	if (id1) {
5479 		s->id1 = got_object_id_dup(id1);
5480 		if (s->id1 == NULL) {
5481 			err = got_error_from_errno("got_object_id_dup");
5482 			goto done;
5483 		}
5484 	} else
5485 		s->id1 = NULL;
5486 
5487 	s->id2 = got_object_id_dup(id2);
5488 	if (s->id2 == NULL) {
5489 		err = got_error_from_errno("got_object_id_dup");
5490 		goto done;
5491 	}
5492 
5493 	s->f1 = got_opentemp();
5494 	if (s->f1 == NULL) {
5495 		err = got_error_from_errno("got_opentemp");
5496 		goto done;
5497 	}
5498 
5499 	s->f2 = got_opentemp();
5500 	if (s->f2 == NULL) {
5501 		err = got_error_from_errno("got_opentemp");
5502 		goto done;
5503 	}
5504 
5505 	s->fd1 = got_opentempfd();
5506 	if (s->fd1 == -1) {
5507 		err = got_error_from_errno("got_opentempfd");
5508 		goto done;
5509 	}
5510 
5511 	s->fd2 = got_opentempfd();
5512 	if (s->fd2 == -1) {
5513 		err = got_error_from_errno("got_opentempfd");
5514 		goto done;
5515 	}
5516 
5517 	s->diff_context = diff_context;
5518 	s->ignore_whitespace = ignore_whitespace;
5519 	s->force_text_diff = force_text_diff;
5520 	s->parent_view = parent_view;
5521 	s->repo = repo;
5522 
5523 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5524 		int rc;
5525 
5526 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5527 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5528 		if (rc != ERR)
5529 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5530 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5531 		if (rc != ERR)
5532 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5533 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5534 		if (rc != ERR)
5535 			rc = init_pair(GOT_DIFF_LINE_META,
5536 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5537 		if (rc != ERR)
5538 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5539 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5540 		if (rc != ERR)
5541 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5542 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5543 		if (rc != ERR)
5544 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5545 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5546 		if (rc != ERR)
5547 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5548 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5549 		if (rc != ERR)
5550 			rc = init_pair(GOT_DIFF_LINE_DATE,
5551 			    get_color_value("TOG_COLOR_DATE"), -1);
5552 		if (rc == ERR) {
5553 			err = got_error(GOT_ERR_RANGE);
5554 			goto done;
5555 		}
5556 	}
5557 
5558 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5559 	    view_is_splitscreen(view))
5560 		show_log_view(parent_view); /* draw border */
5561 	diff_view_indicate_progress(view);
5562 
5563 	err = create_diff(s);
5564 
5565 	view->show = show_diff_view;
5566 	view->input = input_diff_view;
5567 	view->reset = reset_diff_view;
5568 	view->close = close_diff_view;
5569 	view->search_start = search_start_diff_view;
5570 	view->search_setup = search_setup_diff_view;
5571 	view->search_next = search_next_view_match;
5572 done:
5573 	if (err) {
5574 		if (view->close == NULL)
5575 			close_diff_view(view);
5576 		view_close(view);
5577 	}
5578 	return err;
5579 }
5580 
5581 static const struct got_error *
5582 show_diff_view(struct tog_view *view)
5583 {
5584 	const struct got_error *err;
5585 	struct tog_diff_view_state *s = &view->state.diff;
5586 	char *id_str1 = NULL, *id_str2, *header;
5587 	const char *label1, *label2;
5588 
5589 	if (s->id1) {
5590 		err = got_object_id_str(&id_str1, s->id1);
5591 		if (err)
5592 			return err;
5593 		label1 = s->label1 ? s->label1 : id_str1;
5594 	} else
5595 		label1 = "/dev/null";
5596 
5597 	err = got_object_id_str(&id_str2, s->id2);
5598 	if (err)
5599 		return err;
5600 	label2 = s->label2 ? s->label2 : id_str2;
5601 
5602 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5603 		err = got_error_from_errno("asprintf");
5604 		free(id_str1);
5605 		free(id_str2);
5606 		return err;
5607 	}
5608 	free(id_str1);
5609 	free(id_str2);
5610 
5611 	err = draw_file(view, header);
5612 	free(header);
5613 	return err;
5614 }
5615 
5616 static const struct got_error *
5617 set_selected_commit(struct tog_diff_view_state *s,
5618     struct commit_queue_entry *entry)
5619 {
5620 	const struct got_error *err;
5621 	const struct got_object_id_queue *parent_ids;
5622 	struct got_commit_object *selected_commit;
5623 	struct got_object_qid *pid;
5624 
5625 	free(s->id2);
5626 	s->id2 = got_object_id_dup(entry->id);
5627 	if (s->id2 == NULL)
5628 		return got_error_from_errno("got_object_id_dup");
5629 
5630 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5631 	if (err)
5632 		return err;
5633 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5634 	free(s->id1);
5635 	pid = STAILQ_FIRST(parent_ids);
5636 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5637 	got_object_commit_close(selected_commit);
5638 	return NULL;
5639 }
5640 
5641 static const struct got_error *
5642 reset_diff_view(struct tog_view *view)
5643 {
5644 	struct tog_diff_view_state *s = &view->state.diff;
5645 
5646 	view->count = 0;
5647 	wclear(view->window);
5648 	s->first_displayed_line = 1;
5649 	s->last_displayed_line = view->nlines;
5650 	s->matched_line = 0;
5651 	diff_view_indicate_progress(view);
5652 	return create_diff(s);
5653 }
5654 
5655 static void
5656 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5657 {
5658 	int start, i;
5659 
5660 	i = start = s->first_displayed_line - 1;
5661 
5662 	while (s->lines[i].type != type) {
5663 		if (i == 0)
5664 			i = s->nlines - 1;
5665 		if (--i == start)
5666 			return; /* do nothing, requested type not in file */
5667 	}
5668 
5669 	s->selected_line = 1;
5670 	s->first_displayed_line = i;
5671 }
5672 
5673 static void
5674 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5675 {
5676 	int start, i;
5677 
5678 	i = start = s->first_displayed_line + 1;
5679 
5680 	while (s->lines[i].type != type) {
5681 		if (i == s->nlines - 1)
5682 			i = 0;
5683 		if (++i == start)
5684 			return; /* do nothing, requested type not in file */
5685 	}
5686 
5687 	s->selected_line = 1;
5688 	s->first_displayed_line = i;
5689 }
5690 
5691 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5692     int, int, int);
5693 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5694     int, int);
5695 
5696 static const struct got_error *
5697 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5698 {
5699 	const struct got_error *err = NULL;
5700 	struct tog_diff_view_state *s = &view->state.diff;
5701 	struct tog_log_view_state *ls;
5702 	struct commit_queue_entry *old_selected_entry;
5703 	char *line = NULL;
5704 	size_t linesize = 0;
5705 	ssize_t linelen;
5706 	int i, nscroll = view->nlines - 1, up = 0;
5707 
5708 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5709 
5710 	switch (ch) {
5711 	case '0':
5712 	case '$':
5713 	case KEY_RIGHT:
5714 	case 'l':
5715 	case KEY_LEFT:
5716 	case 'h':
5717 		horizontal_scroll_input(view, ch);
5718 		break;
5719 	case 'a':
5720 	case 'w':
5721 		if (ch == 'a') {
5722 			s->force_text_diff = !s->force_text_diff;
5723 			view->action = s->force_text_diff ?
5724 			    "force ASCII text enabled" :
5725 			    "force ASCII text disabled";
5726 		}
5727 		else if (ch == 'w') {
5728 			s->ignore_whitespace = !s->ignore_whitespace;
5729 			view->action = s->ignore_whitespace ?
5730 			    "ignore whitespace enabled" :
5731 			    "ignore whitespace disabled";
5732 		}
5733 		err = reset_diff_view(view);
5734 		break;
5735 	case 'g':
5736 	case KEY_HOME:
5737 		s->first_displayed_line = 1;
5738 		view->count = 0;
5739 		break;
5740 	case 'G':
5741 	case KEY_END:
5742 		view->count = 0;
5743 		if (s->eof)
5744 			break;
5745 
5746 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5747 		s->eof = 1;
5748 		break;
5749 	case 'k':
5750 	case KEY_UP:
5751 	case CTRL('p'):
5752 		if (s->first_displayed_line > 1)
5753 			s->first_displayed_line--;
5754 		else
5755 			view->count = 0;
5756 		break;
5757 	case CTRL('u'):
5758 	case 'u':
5759 		nscroll /= 2;
5760 		/* FALL THROUGH */
5761 	case KEY_PPAGE:
5762 	case CTRL('b'):
5763 	case 'b':
5764 		if (s->first_displayed_line == 1) {
5765 			view->count = 0;
5766 			break;
5767 		}
5768 		i = 0;
5769 		while (i++ < nscroll && s->first_displayed_line > 1)
5770 			s->first_displayed_line--;
5771 		break;
5772 	case 'j':
5773 	case KEY_DOWN:
5774 	case CTRL('n'):
5775 		if (!s->eof)
5776 			s->first_displayed_line++;
5777 		else
5778 			view->count = 0;
5779 		break;
5780 	case CTRL('d'):
5781 	case 'd':
5782 		nscroll /= 2;
5783 		/* FALL THROUGH */
5784 	case KEY_NPAGE:
5785 	case CTRL('f'):
5786 	case 'f':
5787 	case ' ':
5788 		if (s->eof) {
5789 			view->count = 0;
5790 			break;
5791 		}
5792 		i = 0;
5793 		while (!s->eof && i++ < nscroll) {
5794 			linelen = getline(&line, &linesize, s->f);
5795 			s->first_displayed_line++;
5796 			if (linelen == -1) {
5797 				if (feof(s->f)) {
5798 					s->eof = 1;
5799 				} else
5800 					err = got_ferror(s->f, GOT_ERR_IO);
5801 				break;
5802 			}
5803 		}
5804 		free(line);
5805 		break;
5806 	case '(':
5807 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5808 		break;
5809 	case ')':
5810 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5811 		break;
5812 	case '{':
5813 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5814 		break;
5815 	case '}':
5816 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5817 		break;
5818 	case '[':
5819 		if (s->diff_context > 0) {
5820 			s->diff_context--;
5821 			s->matched_line = 0;
5822 			diff_view_indicate_progress(view);
5823 			err = create_diff(s);
5824 			if (s->first_displayed_line + view->nlines - 1 >
5825 			    s->nlines) {
5826 				s->first_displayed_line = 1;
5827 				s->last_displayed_line = view->nlines;
5828 			}
5829 		} else
5830 			view->count = 0;
5831 		break;
5832 	case ']':
5833 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5834 			s->diff_context++;
5835 			s->matched_line = 0;
5836 			diff_view_indicate_progress(view);
5837 			err = create_diff(s);
5838 		} else
5839 			view->count = 0;
5840 		break;
5841 	case '<':
5842 	case ',':
5843 	case 'K':
5844 		up = 1;
5845 		/* FALL THROUGH */
5846 	case '>':
5847 	case '.':
5848 	case 'J':
5849 		if (s->parent_view == NULL) {
5850 			view->count = 0;
5851 			break;
5852 		}
5853 		s->parent_view->count = view->count;
5854 
5855 		if (s->parent_view->type == TOG_VIEW_LOG) {
5856 			ls = &s->parent_view->state.log;
5857 			old_selected_entry = ls->selected_entry;
5858 
5859 			err = input_log_view(NULL, s->parent_view,
5860 			    up ? KEY_UP : KEY_DOWN);
5861 			if (err)
5862 				break;
5863 			view->count = s->parent_view->count;
5864 
5865 			if (old_selected_entry == ls->selected_entry)
5866 				break;
5867 
5868 			err = set_selected_commit(s, ls->selected_entry);
5869 			if (err)
5870 				break;
5871 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5872 			struct tog_blame_view_state *bs;
5873 			struct got_object_id *id, *prev_id;
5874 
5875 			bs = &s->parent_view->state.blame;
5876 			prev_id = get_annotation_for_line(bs->blame.lines,
5877 			    bs->blame.nlines, bs->last_diffed_line);
5878 
5879 			err = input_blame_view(&view, s->parent_view,
5880 			    up ? KEY_UP : KEY_DOWN);
5881 			if (err)
5882 				break;
5883 			view->count = s->parent_view->count;
5884 
5885 			if (prev_id == NULL)
5886 				break;
5887 			id = get_selected_commit_id(bs->blame.lines,
5888 			    bs->blame.nlines, bs->first_displayed_line,
5889 			    bs->selected_line);
5890 			if (id == NULL)
5891 				break;
5892 
5893 			if (!got_object_id_cmp(prev_id, id))
5894 				break;
5895 
5896 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5897 			if (err)
5898 				break;
5899 		}
5900 		s->first_displayed_line = 1;
5901 		s->last_displayed_line = view->nlines;
5902 		s->matched_line = 0;
5903 		view->x = 0;
5904 
5905 		diff_view_indicate_progress(view);
5906 		err = create_diff(s);
5907 		break;
5908 	default:
5909 		view->count = 0;
5910 		break;
5911 	}
5912 
5913 	return err;
5914 }
5915 
5916 static const struct got_error *
5917 cmd_diff(int argc, char *argv[])
5918 {
5919 	const struct got_error *error;
5920 	struct got_repository *repo = NULL;
5921 	struct got_worktree *worktree = NULL;
5922 	struct got_object_id *id1 = NULL, *id2 = NULL;
5923 	char *repo_path = NULL, *cwd = NULL;
5924 	char *id_str1 = NULL, *id_str2 = NULL;
5925 	char *label1 = NULL, *label2 = NULL;
5926 	int diff_context = 3, ignore_whitespace = 0;
5927 	int ch, force_text_diff = 0;
5928 	const char *errstr;
5929 	struct tog_view *view;
5930 	int *pack_fds = NULL;
5931 
5932 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5933 		switch (ch) {
5934 		case 'a':
5935 			force_text_diff = 1;
5936 			break;
5937 		case 'C':
5938 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5939 			    &errstr);
5940 			if (errstr != NULL)
5941 				errx(1, "number of context lines is %s: %s",
5942 				    errstr, errstr);
5943 			break;
5944 		case 'r':
5945 			repo_path = realpath(optarg, NULL);
5946 			if (repo_path == NULL)
5947 				return got_error_from_errno2("realpath",
5948 				    optarg);
5949 			got_path_strip_trailing_slashes(repo_path);
5950 			break;
5951 		case 'w':
5952 			ignore_whitespace = 1;
5953 			break;
5954 		default:
5955 			usage_diff();
5956 			/* NOTREACHED */
5957 		}
5958 	}
5959 
5960 	argc -= optind;
5961 	argv += optind;
5962 
5963 	if (argc == 0) {
5964 		usage_diff(); /* TODO show local worktree changes */
5965 	} else if (argc == 2) {
5966 		id_str1 = argv[0];
5967 		id_str2 = argv[1];
5968 	} else
5969 		usage_diff();
5970 
5971 	error = got_repo_pack_fds_open(&pack_fds);
5972 	if (error)
5973 		goto done;
5974 
5975 	if (repo_path == NULL) {
5976 		cwd = getcwd(NULL, 0);
5977 		if (cwd == NULL)
5978 			return got_error_from_errno("getcwd");
5979 		error = got_worktree_open(&worktree, cwd);
5980 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5981 			goto done;
5982 		if (worktree)
5983 			repo_path =
5984 			    strdup(got_worktree_get_repo_path(worktree));
5985 		else
5986 			repo_path = strdup(cwd);
5987 		if (repo_path == NULL) {
5988 			error = got_error_from_errno("strdup");
5989 			goto done;
5990 		}
5991 	}
5992 
5993 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5994 	if (error)
5995 		goto done;
5996 
5997 	init_curses();
5998 
5999 	error = apply_unveil(got_repo_get_path(repo), NULL);
6000 	if (error)
6001 		goto done;
6002 
6003 	error = tog_load_refs(repo, 0);
6004 	if (error)
6005 		goto done;
6006 
6007 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6008 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6009 	if (error)
6010 		goto done;
6011 
6012 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6013 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6014 	if (error)
6015 		goto done;
6016 
6017 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6018 	if (view == NULL) {
6019 		error = got_error_from_errno("view_open");
6020 		goto done;
6021 	}
6022 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6023 	    ignore_whitespace, force_text_diff, NULL,  repo);
6024 	if (error)
6025 		goto done;
6026 	error = view_loop(view);
6027 done:
6028 	free(label1);
6029 	free(label2);
6030 	free(repo_path);
6031 	free(cwd);
6032 	if (repo) {
6033 		const struct got_error *close_err = got_repo_close(repo);
6034 		if (error == NULL)
6035 			error = close_err;
6036 	}
6037 	if (worktree)
6038 		got_worktree_close(worktree);
6039 	if (pack_fds) {
6040 		const struct got_error *pack_err =
6041 		    got_repo_pack_fds_close(pack_fds);
6042 		if (error == NULL)
6043 			error = pack_err;
6044 	}
6045 	tog_free_refs();
6046 	return error;
6047 }
6048 
6049 __dead static void
6050 usage_blame(void)
6051 {
6052 	endwin();
6053 	fprintf(stderr,
6054 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6055 	    getprogname());
6056 	exit(1);
6057 }
6058 
6059 struct tog_blame_line {
6060 	int annotated;
6061 	struct got_object_id *id;
6062 };
6063 
6064 static const struct got_error *
6065 draw_blame(struct tog_view *view)
6066 {
6067 	struct tog_blame_view_state *s = &view->state.blame;
6068 	struct tog_blame *blame = &s->blame;
6069 	regmatch_t *regmatch = &view->regmatch;
6070 	const struct got_error *err;
6071 	int lineno = 0, nprinted = 0;
6072 	char *line = NULL;
6073 	size_t linesize = 0;
6074 	ssize_t linelen;
6075 	wchar_t *wline;
6076 	int width;
6077 	struct tog_blame_line *blame_line;
6078 	struct got_object_id *prev_id = NULL;
6079 	char *id_str;
6080 	struct tog_color *tc;
6081 
6082 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6083 	if (err)
6084 		return err;
6085 
6086 	rewind(blame->f);
6087 	werase(view->window);
6088 
6089 	if (asprintf(&line, "commit %s", id_str) == -1) {
6090 		err = got_error_from_errno("asprintf");
6091 		free(id_str);
6092 		return err;
6093 	}
6094 
6095 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6096 	free(line);
6097 	line = NULL;
6098 	if (err)
6099 		return err;
6100 	if (view_needs_focus_indication(view))
6101 		wstandout(view->window);
6102 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6103 	if (tc)
6104 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6105 	waddwstr(view->window, wline);
6106 	while (width++ < view->ncols)
6107 		waddch(view->window, ' ');
6108 	if (tc)
6109 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6110 	if (view_needs_focus_indication(view))
6111 		wstandend(view->window);
6112 	free(wline);
6113 	wline = NULL;
6114 
6115 	if (view->gline > blame->nlines)
6116 		view->gline = blame->nlines;
6117 
6118 	if (tog_io.wait_for_ui) {
6119 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6120 		int rc;
6121 
6122 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6123 		if (rc)
6124 			return got_error_set_errno(rc, "pthread_cond_wait");
6125 		tog_io.wait_for_ui = 0;
6126 	}
6127 
6128 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6129 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6130 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6131 		free(id_str);
6132 		return got_error_from_errno("asprintf");
6133 	}
6134 	free(id_str);
6135 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6136 	free(line);
6137 	line = NULL;
6138 	if (err)
6139 		return err;
6140 	waddwstr(view->window, wline);
6141 	free(wline);
6142 	wline = NULL;
6143 	if (width < view->ncols - 1)
6144 		waddch(view->window, '\n');
6145 
6146 	s->eof = 0;
6147 	view->maxx = 0;
6148 	while (nprinted < view->nlines - 2) {
6149 		linelen = getline(&line, &linesize, blame->f);
6150 		if (linelen == -1) {
6151 			if (feof(blame->f)) {
6152 				s->eof = 1;
6153 				break;
6154 			}
6155 			free(line);
6156 			return got_ferror(blame->f, GOT_ERR_IO);
6157 		}
6158 		if (++lineno < s->first_displayed_line)
6159 			continue;
6160 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6161 			continue;
6162 
6163 		/* Set view->maxx based on full line length. */
6164 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6165 		if (err) {
6166 			free(line);
6167 			return err;
6168 		}
6169 		free(wline);
6170 		wline = NULL;
6171 		view->maxx = MAX(view->maxx, width);
6172 
6173 		if (nprinted == s->selected_line - 1)
6174 			wstandout(view->window);
6175 
6176 		if (blame->nlines > 0) {
6177 			blame_line = &blame->lines[lineno - 1];
6178 			if (blame_line->annotated && prev_id &&
6179 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6180 			    !(nprinted == s->selected_line - 1)) {
6181 				waddstr(view->window, "        ");
6182 			} else if (blame_line->annotated) {
6183 				char *id_str;
6184 				err = got_object_id_str(&id_str,
6185 				    blame_line->id);
6186 				if (err) {
6187 					free(line);
6188 					return err;
6189 				}
6190 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6191 				if (tc)
6192 					wattr_on(view->window,
6193 					    COLOR_PAIR(tc->colorpair), NULL);
6194 				wprintw(view->window, "%.8s", id_str);
6195 				if (tc)
6196 					wattr_off(view->window,
6197 					    COLOR_PAIR(tc->colorpair), NULL);
6198 				free(id_str);
6199 				prev_id = blame_line->id;
6200 			} else {
6201 				waddstr(view->window, "........");
6202 				prev_id = NULL;
6203 			}
6204 		} else {
6205 			waddstr(view->window, "........");
6206 			prev_id = NULL;
6207 		}
6208 
6209 		if (nprinted == s->selected_line - 1)
6210 			wstandend(view->window);
6211 		waddstr(view->window, " ");
6212 
6213 		if (view->ncols <= 9) {
6214 			width = 9;
6215 		} else if (s->first_displayed_line + nprinted ==
6216 		    s->matched_line &&
6217 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6218 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6219 			    view->window, view->x, regmatch);
6220 			if (err) {
6221 				free(line);
6222 				return err;
6223 			}
6224 			width += 9;
6225 		} else {
6226 			int skip;
6227 			err = format_line(&wline, &width, &skip, line,
6228 			    view->x, view->ncols - 9, 9, 1);
6229 			if (err) {
6230 				free(line);
6231 				return err;
6232 			}
6233 			waddwstr(view->window, &wline[skip]);
6234 			width += 9;
6235 			free(wline);
6236 			wline = NULL;
6237 		}
6238 
6239 		if (width <= view->ncols - 1)
6240 			waddch(view->window, '\n');
6241 		if (++nprinted == 1)
6242 			s->first_displayed_line = lineno;
6243 	}
6244 	free(line);
6245 	s->last_displayed_line = lineno;
6246 
6247 	view_border(view);
6248 
6249 	return NULL;
6250 }
6251 
6252 static const struct got_error *
6253 blame_cb(void *arg, int nlines, int lineno,
6254     struct got_commit_object *commit, struct got_object_id *id)
6255 {
6256 	const struct got_error *err = NULL;
6257 	struct tog_blame_cb_args *a = arg;
6258 	struct tog_blame_line *line;
6259 	int errcode;
6260 
6261 	if (nlines != a->nlines ||
6262 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6263 		return got_error(GOT_ERR_RANGE);
6264 
6265 	errcode = pthread_mutex_lock(&tog_mutex);
6266 	if (errcode)
6267 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6268 
6269 	if (*a->quit) {	/* user has quit the blame view */
6270 		err = got_error(GOT_ERR_ITER_COMPLETED);
6271 		goto done;
6272 	}
6273 
6274 	if (lineno == -1)
6275 		goto done; /* no change in this commit */
6276 
6277 	line = &a->lines[lineno - 1];
6278 	if (line->annotated)
6279 		goto done;
6280 
6281 	line->id = got_object_id_dup(id);
6282 	if (line->id == NULL) {
6283 		err = got_error_from_errno("got_object_id_dup");
6284 		goto done;
6285 	}
6286 	line->annotated = 1;
6287 done:
6288 	errcode = pthread_mutex_unlock(&tog_mutex);
6289 	if (errcode)
6290 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6291 	return err;
6292 }
6293 
6294 static void *
6295 blame_thread(void *arg)
6296 {
6297 	const struct got_error *err, *close_err;
6298 	struct tog_blame_thread_args *ta = arg;
6299 	struct tog_blame_cb_args *a = ta->cb_args;
6300 	int errcode, fd1 = -1, fd2 = -1;
6301 	FILE *f1 = NULL, *f2 = NULL;
6302 
6303 	fd1 = got_opentempfd();
6304 	if (fd1 == -1)
6305 		return (void *)got_error_from_errno("got_opentempfd");
6306 
6307 	fd2 = got_opentempfd();
6308 	if (fd2 == -1) {
6309 		err = got_error_from_errno("got_opentempfd");
6310 		goto done;
6311 	}
6312 
6313 	f1 = got_opentemp();
6314 	if (f1 == NULL) {
6315 		err = (void *)got_error_from_errno("got_opentemp");
6316 		goto done;
6317 	}
6318 	f2 = got_opentemp();
6319 	if (f2 == NULL) {
6320 		err = (void *)got_error_from_errno("got_opentemp");
6321 		goto done;
6322 	}
6323 
6324 	err = block_signals_used_by_main_thread();
6325 	if (err)
6326 		goto done;
6327 
6328 	err = got_blame(ta->path, a->commit_id, ta->repo,
6329 	    tog_diff_algo, blame_cb, ta->cb_args,
6330 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6331 	if (err && err->code == GOT_ERR_CANCELLED)
6332 		err = NULL;
6333 
6334 	errcode = pthread_mutex_lock(&tog_mutex);
6335 	if (errcode) {
6336 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6337 		goto done;
6338 	}
6339 
6340 	close_err = got_repo_close(ta->repo);
6341 	if (err == NULL)
6342 		err = close_err;
6343 	ta->repo = NULL;
6344 	*ta->complete = 1;
6345 
6346 	if (tog_io.wait_for_ui) {
6347 		errcode = pthread_cond_signal(&ta->blame_complete);
6348 		if (errcode && err == NULL)
6349 			err = got_error_set_errno(errcode,
6350 			    "pthread_cond_signal");
6351 	}
6352 
6353 	errcode = pthread_mutex_unlock(&tog_mutex);
6354 	if (errcode && err == NULL)
6355 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6356 
6357 done:
6358 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6359 		err = got_error_from_errno("close");
6360 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6361 		err = got_error_from_errno("close");
6362 	if (f1 && fclose(f1) == EOF && err == NULL)
6363 		err = got_error_from_errno("fclose");
6364 	if (f2 && fclose(f2) == EOF && err == NULL)
6365 		err = got_error_from_errno("fclose");
6366 
6367 	return (void *)err;
6368 }
6369 
6370 static struct got_object_id *
6371 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6372     int first_displayed_line, int selected_line)
6373 {
6374 	struct tog_blame_line *line;
6375 
6376 	if (nlines <= 0)
6377 		return NULL;
6378 
6379 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6380 	if (!line->annotated)
6381 		return NULL;
6382 
6383 	return line->id;
6384 }
6385 
6386 static struct got_object_id *
6387 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6388     int lineno)
6389 {
6390 	struct tog_blame_line *line;
6391 
6392 	if (nlines <= 0 || lineno >= nlines)
6393 		return NULL;
6394 
6395 	line = &lines[lineno - 1];
6396 	if (!line->annotated)
6397 		return NULL;
6398 
6399 	return line->id;
6400 }
6401 
6402 static const struct got_error *
6403 stop_blame(struct tog_blame *blame)
6404 {
6405 	const struct got_error *err = NULL;
6406 	int i;
6407 
6408 	if (blame->thread) {
6409 		int errcode;
6410 		errcode = pthread_mutex_unlock(&tog_mutex);
6411 		if (errcode)
6412 			return got_error_set_errno(errcode,
6413 			    "pthread_mutex_unlock");
6414 		errcode = pthread_join(blame->thread, (void **)&err);
6415 		if (errcode)
6416 			return got_error_set_errno(errcode, "pthread_join");
6417 		errcode = pthread_mutex_lock(&tog_mutex);
6418 		if (errcode)
6419 			return got_error_set_errno(errcode,
6420 			    "pthread_mutex_lock");
6421 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6422 			err = NULL;
6423 		blame->thread = 0; //NULL;
6424 	}
6425 	if (blame->thread_args.repo) {
6426 		const struct got_error *close_err;
6427 		close_err = got_repo_close(blame->thread_args.repo);
6428 		if (err == NULL)
6429 			err = close_err;
6430 		blame->thread_args.repo = NULL;
6431 	}
6432 	if (blame->f) {
6433 		if (fclose(blame->f) == EOF && err == NULL)
6434 			err = got_error_from_errno("fclose");
6435 		blame->f = NULL;
6436 	}
6437 	if (blame->lines) {
6438 		for (i = 0; i < blame->nlines; i++)
6439 			free(blame->lines[i].id);
6440 		free(blame->lines);
6441 		blame->lines = NULL;
6442 	}
6443 	free(blame->cb_args.commit_id);
6444 	blame->cb_args.commit_id = NULL;
6445 	if (blame->pack_fds) {
6446 		const struct got_error *pack_err =
6447 		    got_repo_pack_fds_close(blame->pack_fds);
6448 		if (err == NULL)
6449 			err = pack_err;
6450 		blame->pack_fds = NULL;
6451 	}
6452 	return err;
6453 }
6454 
6455 static const struct got_error *
6456 cancel_blame_view(void *arg)
6457 {
6458 	const struct got_error *err = NULL;
6459 	int *done = arg;
6460 	int errcode;
6461 
6462 	errcode = pthread_mutex_lock(&tog_mutex);
6463 	if (errcode)
6464 		return got_error_set_errno(errcode,
6465 		    "pthread_mutex_unlock");
6466 
6467 	if (*done)
6468 		err = got_error(GOT_ERR_CANCELLED);
6469 
6470 	errcode = pthread_mutex_unlock(&tog_mutex);
6471 	if (errcode)
6472 		return got_error_set_errno(errcode,
6473 		    "pthread_mutex_lock");
6474 
6475 	return err;
6476 }
6477 
6478 static const struct got_error *
6479 run_blame(struct tog_view *view)
6480 {
6481 	struct tog_blame_view_state *s = &view->state.blame;
6482 	struct tog_blame *blame = &s->blame;
6483 	const struct got_error *err = NULL;
6484 	struct got_commit_object *commit = NULL;
6485 	struct got_blob_object *blob = NULL;
6486 	struct got_repository *thread_repo = NULL;
6487 	struct got_object_id *obj_id = NULL;
6488 	int obj_type, fd = -1;
6489 	int *pack_fds = NULL;
6490 
6491 	err = got_object_open_as_commit(&commit, s->repo,
6492 	    &s->blamed_commit->id);
6493 	if (err)
6494 		return err;
6495 
6496 	fd = got_opentempfd();
6497 	if (fd == -1) {
6498 		err = got_error_from_errno("got_opentempfd");
6499 		goto done;
6500 	}
6501 
6502 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6503 	if (err)
6504 		goto done;
6505 
6506 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6507 	if (err)
6508 		goto done;
6509 
6510 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6511 		err = got_error(GOT_ERR_OBJ_TYPE);
6512 		goto done;
6513 	}
6514 
6515 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6516 	if (err)
6517 		goto done;
6518 	blame->f = got_opentemp();
6519 	if (blame->f == NULL) {
6520 		err = got_error_from_errno("got_opentemp");
6521 		goto done;
6522 	}
6523 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6524 	    &blame->line_offsets, blame->f, blob);
6525 	if (err)
6526 		goto done;
6527 	if (blame->nlines == 0) {
6528 		s->blame_complete = 1;
6529 		goto done;
6530 	}
6531 
6532 	/* Don't include \n at EOF in the blame line count. */
6533 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6534 		blame->nlines--;
6535 
6536 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6537 	if (blame->lines == NULL) {
6538 		err = got_error_from_errno("calloc");
6539 		goto done;
6540 	}
6541 
6542 	err = got_repo_pack_fds_open(&pack_fds);
6543 	if (err)
6544 		goto done;
6545 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6546 	    pack_fds);
6547 	if (err)
6548 		goto done;
6549 
6550 	blame->pack_fds = pack_fds;
6551 	blame->cb_args.view = view;
6552 	blame->cb_args.lines = blame->lines;
6553 	blame->cb_args.nlines = blame->nlines;
6554 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6555 	if (blame->cb_args.commit_id == NULL) {
6556 		err = got_error_from_errno("got_object_id_dup");
6557 		goto done;
6558 	}
6559 	blame->cb_args.quit = &s->done;
6560 
6561 	blame->thread_args.path = s->path;
6562 	blame->thread_args.repo = thread_repo;
6563 	blame->thread_args.cb_args = &blame->cb_args;
6564 	blame->thread_args.complete = &s->blame_complete;
6565 	blame->thread_args.cancel_cb = cancel_blame_view;
6566 	blame->thread_args.cancel_arg = &s->done;
6567 	s->blame_complete = 0;
6568 
6569 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6570 		s->first_displayed_line = 1;
6571 		s->last_displayed_line = view->nlines;
6572 		s->selected_line = 1;
6573 	}
6574 	s->matched_line = 0;
6575 
6576 done:
6577 	if (commit)
6578 		got_object_commit_close(commit);
6579 	if (fd != -1 && close(fd) == -1 && err == NULL)
6580 		err = got_error_from_errno("close");
6581 	if (blob)
6582 		got_object_blob_close(blob);
6583 	free(obj_id);
6584 	if (err)
6585 		stop_blame(blame);
6586 	return err;
6587 }
6588 
6589 static const struct got_error *
6590 open_blame_view(struct tog_view *view, char *path,
6591     struct got_object_id *commit_id, struct got_repository *repo)
6592 {
6593 	const struct got_error *err = NULL;
6594 	struct tog_blame_view_state *s = &view->state.blame;
6595 
6596 	STAILQ_INIT(&s->blamed_commits);
6597 
6598 	s->path = strdup(path);
6599 	if (s->path == NULL)
6600 		return got_error_from_errno("strdup");
6601 
6602 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6603 	if (err) {
6604 		free(s->path);
6605 		return err;
6606 	}
6607 
6608 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6609 	s->first_displayed_line = 1;
6610 	s->last_displayed_line = view->nlines;
6611 	s->selected_line = 1;
6612 	s->blame_complete = 0;
6613 	s->repo = repo;
6614 	s->commit_id = commit_id;
6615 	memset(&s->blame, 0, sizeof(s->blame));
6616 
6617 	STAILQ_INIT(&s->colors);
6618 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6619 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6620 		    get_color_value("TOG_COLOR_COMMIT"));
6621 		if (err)
6622 			return err;
6623 	}
6624 
6625 	view->show = show_blame_view;
6626 	view->input = input_blame_view;
6627 	view->reset = reset_blame_view;
6628 	view->close = close_blame_view;
6629 	view->search_start = search_start_blame_view;
6630 	view->search_setup = search_setup_blame_view;
6631 	view->search_next = search_next_view_match;
6632 
6633 	if (using_mock_io) {
6634 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6635 		int rc;
6636 
6637 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6638 		if (rc)
6639 			return got_error_set_errno(rc, "pthread_cond_init");
6640 	}
6641 
6642 	return run_blame(view);
6643 }
6644 
6645 static const struct got_error *
6646 close_blame_view(struct tog_view *view)
6647 {
6648 	const struct got_error *err = NULL;
6649 	struct tog_blame_view_state *s = &view->state.blame;
6650 
6651 	if (s->blame.thread)
6652 		err = stop_blame(&s->blame);
6653 
6654 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6655 		struct got_object_qid *blamed_commit;
6656 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6657 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6658 		got_object_qid_free(blamed_commit);
6659 	}
6660 
6661 	if (using_mock_io) {
6662 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6663 		int rc;
6664 
6665 		rc = pthread_cond_destroy(&bta->blame_complete);
6666 		if (rc && err == NULL)
6667 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6668 	}
6669 
6670 	free(s->path);
6671 	free_colors(&s->colors);
6672 	return err;
6673 }
6674 
6675 static const struct got_error *
6676 search_start_blame_view(struct tog_view *view)
6677 {
6678 	struct tog_blame_view_state *s = &view->state.blame;
6679 
6680 	s->matched_line = 0;
6681 	return NULL;
6682 }
6683 
6684 static void
6685 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6686     size_t *nlines, int **first, int **last, int **match, int **selected)
6687 {
6688 	struct tog_blame_view_state *s = &view->state.blame;
6689 
6690 	*f = s->blame.f;
6691 	*nlines = s->blame.nlines;
6692 	*line_offsets = s->blame.line_offsets;
6693 	*match = &s->matched_line;
6694 	*first = &s->first_displayed_line;
6695 	*last = &s->last_displayed_line;
6696 	*selected = &s->selected_line;
6697 }
6698 
6699 static const struct got_error *
6700 show_blame_view(struct tog_view *view)
6701 {
6702 	const struct got_error *err = NULL;
6703 	struct tog_blame_view_state *s = &view->state.blame;
6704 	int errcode;
6705 
6706 	if (s->blame.thread == 0 && !s->blame_complete) {
6707 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6708 		    &s->blame.thread_args);
6709 		if (errcode)
6710 			return got_error_set_errno(errcode, "pthread_create");
6711 
6712 		if (!using_mock_io)
6713 			halfdelay(1); /* fast refresh while annotating  */
6714 	}
6715 
6716 	if (s->blame_complete && !using_mock_io)
6717 		halfdelay(10); /* disable fast refresh */
6718 
6719 	err = draw_blame(view);
6720 
6721 	view_border(view);
6722 	return err;
6723 }
6724 
6725 static const struct got_error *
6726 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6727     struct got_repository *repo, struct got_object_id *id)
6728 {
6729 	struct tog_view		*log_view;
6730 	const struct got_error	*err = NULL;
6731 
6732 	*new_view = NULL;
6733 
6734 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6735 	if (log_view == NULL)
6736 		return got_error_from_errno("view_open");
6737 
6738 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6739 	if (err)
6740 		view_close(log_view);
6741 	else
6742 		*new_view = log_view;
6743 
6744 	return err;
6745 }
6746 
6747 static const struct got_error *
6748 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6749 {
6750 	const struct got_error *err = NULL, *thread_err = NULL;
6751 	struct tog_view *diff_view;
6752 	struct tog_blame_view_state *s = &view->state.blame;
6753 	int eos, nscroll, begin_y = 0, begin_x = 0;
6754 
6755 	eos = nscroll = view->nlines - 2;
6756 	if (view_is_hsplit_top(view))
6757 		--eos;  /* border */
6758 
6759 	switch (ch) {
6760 	case '0':
6761 	case '$':
6762 	case KEY_RIGHT:
6763 	case 'l':
6764 	case KEY_LEFT:
6765 	case 'h':
6766 		horizontal_scroll_input(view, ch);
6767 		break;
6768 	case 'q':
6769 		s->done = 1;
6770 		break;
6771 	case 'g':
6772 	case KEY_HOME:
6773 		s->selected_line = 1;
6774 		s->first_displayed_line = 1;
6775 		view->count = 0;
6776 		break;
6777 	case 'G':
6778 	case KEY_END:
6779 		if (s->blame.nlines < eos) {
6780 			s->selected_line = s->blame.nlines;
6781 			s->first_displayed_line = 1;
6782 		} else {
6783 			s->selected_line = eos;
6784 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6785 		}
6786 		view->count = 0;
6787 		break;
6788 	case 'k':
6789 	case KEY_UP:
6790 	case CTRL('p'):
6791 		if (s->selected_line > 1)
6792 			s->selected_line--;
6793 		else if (s->selected_line == 1 &&
6794 		    s->first_displayed_line > 1)
6795 			s->first_displayed_line--;
6796 		else
6797 			view->count = 0;
6798 		break;
6799 	case CTRL('u'):
6800 	case 'u':
6801 		nscroll /= 2;
6802 		/* FALL THROUGH */
6803 	case KEY_PPAGE:
6804 	case CTRL('b'):
6805 	case 'b':
6806 		if (s->first_displayed_line == 1) {
6807 			if (view->count > 1)
6808 				nscroll += nscroll;
6809 			s->selected_line = MAX(1, s->selected_line - nscroll);
6810 			view->count = 0;
6811 			break;
6812 		}
6813 		if (s->first_displayed_line > nscroll)
6814 			s->first_displayed_line -= nscroll;
6815 		else
6816 			s->first_displayed_line = 1;
6817 		break;
6818 	case 'j':
6819 	case KEY_DOWN:
6820 	case CTRL('n'):
6821 		if (s->selected_line < eos && s->first_displayed_line +
6822 		    s->selected_line <= s->blame.nlines)
6823 			s->selected_line++;
6824 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6825 			s->first_displayed_line++;
6826 		else
6827 			view->count = 0;
6828 		break;
6829 	case 'c':
6830 	case 'p': {
6831 		struct got_object_id *id = NULL;
6832 
6833 		view->count = 0;
6834 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6835 		    s->first_displayed_line, s->selected_line);
6836 		if (id == NULL)
6837 			break;
6838 		if (ch == 'p') {
6839 			struct got_commit_object *commit, *pcommit;
6840 			struct got_object_qid *pid;
6841 			struct got_object_id *blob_id = NULL;
6842 			int obj_type;
6843 			err = got_object_open_as_commit(&commit,
6844 			    s->repo, id);
6845 			if (err)
6846 				break;
6847 			pid = STAILQ_FIRST(
6848 			    got_object_commit_get_parent_ids(commit));
6849 			if (pid == NULL) {
6850 				got_object_commit_close(commit);
6851 				break;
6852 			}
6853 			/* Check if path history ends here. */
6854 			err = got_object_open_as_commit(&pcommit,
6855 			    s->repo, &pid->id);
6856 			if (err)
6857 				break;
6858 			err = got_object_id_by_path(&blob_id, s->repo,
6859 			    pcommit, s->path);
6860 			got_object_commit_close(pcommit);
6861 			if (err) {
6862 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6863 					err = NULL;
6864 				got_object_commit_close(commit);
6865 				break;
6866 			}
6867 			err = got_object_get_type(&obj_type, s->repo,
6868 			    blob_id);
6869 			free(blob_id);
6870 			/* Can't blame non-blob type objects. */
6871 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6872 				got_object_commit_close(commit);
6873 				break;
6874 			}
6875 			err = got_object_qid_alloc(&s->blamed_commit,
6876 			    &pid->id);
6877 			got_object_commit_close(commit);
6878 		} else {
6879 			if (got_object_id_cmp(id,
6880 			    &s->blamed_commit->id) == 0)
6881 				break;
6882 			err = got_object_qid_alloc(&s->blamed_commit,
6883 			    id);
6884 		}
6885 		if (err)
6886 			break;
6887 		s->done = 1;
6888 		thread_err = stop_blame(&s->blame);
6889 		s->done = 0;
6890 		if (thread_err)
6891 			break;
6892 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6893 		    s->blamed_commit, entry);
6894 		err = run_blame(view);
6895 		if (err)
6896 			break;
6897 		break;
6898 	}
6899 	case 'C': {
6900 		struct got_object_qid *first;
6901 
6902 		view->count = 0;
6903 		first = STAILQ_FIRST(&s->blamed_commits);
6904 		if (!got_object_id_cmp(&first->id, s->commit_id))
6905 			break;
6906 		s->done = 1;
6907 		thread_err = stop_blame(&s->blame);
6908 		s->done = 0;
6909 		if (thread_err)
6910 			break;
6911 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6912 		got_object_qid_free(s->blamed_commit);
6913 		s->blamed_commit =
6914 		    STAILQ_FIRST(&s->blamed_commits);
6915 		err = run_blame(view);
6916 		if (err)
6917 			break;
6918 		break;
6919 	}
6920 	case 'L':
6921 		view->count = 0;
6922 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6923 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6924 		if (s->id_to_log)
6925 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6926 		break;
6927 	case KEY_ENTER:
6928 	case '\r': {
6929 		struct got_object_id *id = NULL;
6930 		struct got_object_qid *pid;
6931 		struct got_commit_object *commit = NULL;
6932 
6933 		view->count = 0;
6934 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6935 		    s->first_displayed_line, s->selected_line);
6936 		if (id == NULL)
6937 			break;
6938 		err = got_object_open_as_commit(&commit, s->repo, id);
6939 		if (err)
6940 			break;
6941 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6942 		if (*new_view) {
6943 			/* traversed from diff view, release diff resources  */
6944 			err = close_diff_view(*new_view);
6945 			if (err)
6946 				break;
6947 			diff_view = *new_view;
6948 		} else {
6949 			if (view_is_parent_view(view))
6950 				view_get_split(view, &begin_y, &begin_x);
6951 
6952 			diff_view = view_open(0, 0, begin_y, begin_x,
6953 			    TOG_VIEW_DIFF);
6954 			if (diff_view == NULL) {
6955 				got_object_commit_close(commit);
6956 				err = got_error_from_errno("view_open");
6957 				break;
6958 			}
6959 		}
6960 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6961 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6962 		got_object_commit_close(commit);
6963 		if (err) {
6964 			view_close(diff_view);
6965 			break;
6966 		}
6967 		s->last_diffed_line = s->first_displayed_line - 1 +
6968 		    s->selected_line;
6969 		if (*new_view)
6970 			break;	/* still open from active diff view */
6971 		if (view_is_parent_view(view) &&
6972 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6973 			err = view_init_hsplit(view, begin_y);
6974 			if (err)
6975 				break;
6976 		}
6977 
6978 		view->focussed = 0;
6979 		diff_view->focussed = 1;
6980 		diff_view->mode = view->mode;
6981 		diff_view->nlines = view->lines - begin_y;
6982 		if (view_is_parent_view(view)) {
6983 			view_transfer_size(diff_view, view);
6984 			err = view_close_child(view);
6985 			if (err)
6986 				break;
6987 			err = view_set_child(view, diff_view);
6988 			if (err)
6989 				break;
6990 			view->focus_child = 1;
6991 		} else
6992 			*new_view = diff_view;
6993 		if (err)
6994 			break;
6995 		break;
6996 	}
6997 	case CTRL('d'):
6998 	case 'd':
6999 		nscroll /= 2;
7000 		/* FALL THROUGH */
7001 	case KEY_NPAGE:
7002 	case CTRL('f'):
7003 	case 'f':
7004 	case ' ':
7005 		if (s->last_displayed_line >= s->blame.nlines &&
7006 		    s->selected_line >= MIN(s->blame.nlines,
7007 		    view->nlines - 2)) {
7008 			view->count = 0;
7009 			break;
7010 		}
7011 		if (s->last_displayed_line >= s->blame.nlines &&
7012 		    s->selected_line < view->nlines - 2) {
7013 			s->selected_line +=
7014 			    MIN(nscroll, s->last_displayed_line -
7015 			    s->first_displayed_line - s->selected_line + 1);
7016 		}
7017 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7018 			s->first_displayed_line += nscroll;
7019 		else
7020 			s->first_displayed_line =
7021 			    s->blame.nlines - (view->nlines - 3);
7022 		break;
7023 	case KEY_RESIZE:
7024 		if (s->selected_line > view->nlines - 2) {
7025 			s->selected_line = MIN(s->blame.nlines,
7026 			    view->nlines - 2);
7027 		}
7028 		break;
7029 	default:
7030 		view->count = 0;
7031 		break;
7032 	}
7033 	return thread_err ? thread_err : err;
7034 }
7035 
7036 static const struct got_error *
7037 reset_blame_view(struct tog_view *view)
7038 {
7039 	const struct got_error *err;
7040 	struct tog_blame_view_state *s = &view->state.blame;
7041 
7042 	view->count = 0;
7043 	s->done = 1;
7044 	err = stop_blame(&s->blame);
7045 	s->done = 0;
7046 	if (err)
7047 		return err;
7048 	return run_blame(view);
7049 }
7050 
7051 static const struct got_error *
7052 cmd_blame(int argc, char *argv[])
7053 {
7054 	const struct got_error *error;
7055 	struct got_repository *repo = NULL;
7056 	struct got_worktree *worktree = NULL;
7057 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7058 	char *link_target = NULL;
7059 	struct got_object_id *commit_id = NULL;
7060 	struct got_commit_object *commit = NULL;
7061 	char *commit_id_str = NULL;
7062 	int ch;
7063 	struct tog_view *view = NULL;
7064 	int *pack_fds = NULL;
7065 
7066 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7067 		switch (ch) {
7068 		case 'c':
7069 			commit_id_str = optarg;
7070 			break;
7071 		case 'r':
7072 			repo_path = realpath(optarg, NULL);
7073 			if (repo_path == NULL)
7074 				return got_error_from_errno2("realpath",
7075 				    optarg);
7076 			break;
7077 		default:
7078 			usage_blame();
7079 			/* NOTREACHED */
7080 		}
7081 	}
7082 
7083 	argc -= optind;
7084 	argv += optind;
7085 
7086 	if (argc != 1)
7087 		usage_blame();
7088 
7089 	error = got_repo_pack_fds_open(&pack_fds);
7090 	if (error != NULL)
7091 		goto done;
7092 
7093 	if (repo_path == NULL) {
7094 		cwd = getcwd(NULL, 0);
7095 		if (cwd == NULL)
7096 			return got_error_from_errno("getcwd");
7097 		error = got_worktree_open(&worktree, cwd);
7098 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7099 			goto done;
7100 		if (worktree)
7101 			repo_path =
7102 			    strdup(got_worktree_get_repo_path(worktree));
7103 		else
7104 			repo_path = strdup(cwd);
7105 		if (repo_path == NULL) {
7106 			error = got_error_from_errno("strdup");
7107 			goto done;
7108 		}
7109 	}
7110 
7111 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7112 	if (error != NULL)
7113 		goto done;
7114 
7115 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7116 	    worktree);
7117 	if (error)
7118 		goto done;
7119 
7120 	init_curses();
7121 
7122 	error = apply_unveil(got_repo_get_path(repo), NULL);
7123 	if (error)
7124 		goto done;
7125 
7126 	error = tog_load_refs(repo, 0);
7127 	if (error)
7128 		goto done;
7129 
7130 	if (commit_id_str == NULL) {
7131 		struct got_reference *head_ref;
7132 		error = got_ref_open(&head_ref, repo, worktree ?
7133 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7134 		if (error != NULL)
7135 			goto done;
7136 		error = got_ref_resolve(&commit_id, repo, head_ref);
7137 		got_ref_close(head_ref);
7138 	} else {
7139 		error = got_repo_match_object_id(&commit_id, NULL,
7140 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7141 	}
7142 	if (error != NULL)
7143 		goto done;
7144 
7145 	error = got_object_open_as_commit(&commit, repo, commit_id);
7146 	if (error)
7147 		goto done;
7148 
7149 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7150 	    commit, repo);
7151 	if (error)
7152 		goto done;
7153 
7154 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7155 	if (view == NULL) {
7156 		error = got_error_from_errno("view_open");
7157 		goto done;
7158 	}
7159 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7160 	    commit_id, repo);
7161 	if (error != NULL) {
7162 		if (view->close == NULL)
7163 			close_blame_view(view);
7164 		view_close(view);
7165 		goto done;
7166 	}
7167 	if (worktree) {
7168 		/* Release work tree lock. */
7169 		got_worktree_close(worktree);
7170 		worktree = NULL;
7171 	}
7172 	error = view_loop(view);
7173 done:
7174 	free(repo_path);
7175 	free(in_repo_path);
7176 	free(link_target);
7177 	free(cwd);
7178 	free(commit_id);
7179 	if (commit)
7180 		got_object_commit_close(commit);
7181 	if (worktree)
7182 		got_worktree_close(worktree);
7183 	if (repo) {
7184 		const struct got_error *close_err = got_repo_close(repo);
7185 		if (error == NULL)
7186 			error = close_err;
7187 	}
7188 	if (pack_fds) {
7189 		const struct got_error *pack_err =
7190 		    got_repo_pack_fds_close(pack_fds);
7191 		if (error == NULL)
7192 			error = pack_err;
7193 	}
7194 	tog_free_refs();
7195 	return error;
7196 }
7197 
7198 static const struct got_error *
7199 draw_tree_entries(struct tog_view *view, const char *parent_path)
7200 {
7201 	struct tog_tree_view_state *s = &view->state.tree;
7202 	const struct got_error *err = NULL;
7203 	struct got_tree_entry *te;
7204 	wchar_t *wline;
7205 	char *index = NULL;
7206 	struct tog_color *tc;
7207 	int width, n, nentries, scrollx, i = 1;
7208 	int limit = view->nlines;
7209 
7210 	s->ndisplayed = 0;
7211 	if (view_is_hsplit_top(view))
7212 		--limit;  /* border */
7213 
7214 	werase(view->window);
7215 
7216 	if (limit == 0)
7217 		return NULL;
7218 
7219 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7220 	    0, 0);
7221 	if (err)
7222 		return err;
7223 	if (view_needs_focus_indication(view))
7224 		wstandout(view->window);
7225 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7226 	if (tc)
7227 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7228 	waddwstr(view->window, wline);
7229 	free(wline);
7230 	wline = NULL;
7231 	while (width++ < view->ncols)
7232 		waddch(view->window, ' ');
7233 	if (tc)
7234 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7235 	if (view_needs_focus_indication(view))
7236 		wstandend(view->window);
7237 	if (--limit <= 0)
7238 		return NULL;
7239 
7240 	i += s->selected;
7241 	if (s->first_displayed_entry) {
7242 		i += got_tree_entry_get_index(s->first_displayed_entry);
7243 		if (s->tree != s->root)
7244 			++i;  /* account for ".." entry */
7245 	}
7246 	nentries = got_object_tree_get_nentries(s->tree);
7247 	if (asprintf(&index, "[%d/%d] %s",
7248 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7249 		return got_error_from_errno("asprintf");
7250 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7251 	free(index);
7252 	if (err)
7253 		return err;
7254 	waddwstr(view->window, wline);
7255 	free(wline);
7256 	wline = NULL;
7257 	if (width < view->ncols - 1)
7258 		waddch(view->window, '\n');
7259 	if (--limit <= 0)
7260 		return NULL;
7261 	waddch(view->window, '\n');
7262 	if (--limit <= 0)
7263 		return NULL;
7264 
7265 	if (s->first_displayed_entry == NULL) {
7266 		te = got_object_tree_get_first_entry(s->tree);
7267 		if (s->selected == 0) {
7268 			if (view->focussed)
7269 				wstandout(view->window);
7270 			s->selected_entry = NULL;
7271 		}
7272 		waddstr(view->window, "  ..\n");	/* parent directory */
7273 		if (s->selected == 0 && view->focussed)
7274 			wstandend(view->window);
7275 		s->ndisplayed++;
7276 		if (--limit <= 0)
7277 			return NULL;
7278 		n = 1;
7279 	} else {
7280 		n = 0;
7281 		te = s->first_displayed_entry;
7282 	}
7283 
7284 	view->maxx = 0;
7285 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7286 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7287 		const char *modestr = "";
7288 		mode_t mode;
7289 
7290 		te = got_object_tree_get_entry(s->tree, i);
7291 		mode = got_tree_entry_get_mode(te);
7292 
7293 		if (s->show_ids) {
7294 			err = got_object_id_str(&id_str,
7295 			    got_tree_entry_get_id(te));
7296 			if (err)
7297 				return got_error_from_errno(
7298 				    "got_object_id_str");
7299 		}
7300 		if (got_object_tree_entry_is_submodule(te))
7301 			modestr = "$";
7302 		else if (S_ISLNK(mode)) {
7303 			int i;
7304 
7305 			err = got_tree_entry_get_symlink_target(&link_target,
7306 			    te, s->repo);
7307 			if (err) {
7308 				free(id_str);
7309 				return err;
7310 			}
7311 			for (i = 0; i < link_target[i] != '\0'; i++) {
7312 				if (!isprint((unsigned char)link_target[i]))
7313 					link_target[i] = '?';
7314 			}
7315 			modestr = "@";
7316 		}
7317 		else if (S_ISDIR(mode))
7318 			modestr = "/";
7319 		else if (mode & S_IXUSR)
7320 			modestr = "*";
7321 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7322 		    got_tree_entry_get_name(te), modestr,
7323 		    link_target ? " -> ": "",
7324 		    link_target ? link_target : "") == -1) {
7325 			free(id_str);
7326 			free(link_target);
7327 			return got_error_from_errno("asprintf");
7328 		}
7329 		free(id_str);
7330 		free(link_target);
7331 
7332 		/* use full line width to determine view->maxx */
7333 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7334 		if (err) {
7335 			free(line);
7336 			break;
7337 		}
7338 		view->maxx = MAX(view->maxx, width);
7339 		free(wline);
7340 		wline = NULL;
7341 
7342 		err = format_line(&wline, &width, &scrollx, line, view->x,
7343 		    view->ncols, 0, 0);
7344 		if (err) {
7345 			free(line);
7346 			break;
7347 		}
7348 		if (n == s->selected) {
7349 			if (view->focussed)
7350 				wstandout(view->window);
7351 			s->selected_entry = te;
7352 		}
7353 		tc = match_color(&s->colors, line);
7354 		if (tc)
7355 			wattr_on(view->window,
7356 			    COLOR_PAIR(tc->colorpair), NULL);
7357 		waddwstr(view->window, &wline[scrollx]);
7358 		if (tc)
7359 			wattr_off(view->window,
7360 			    COLOR_PAIR(tc->colorpair), NULL);
7361 		if (width < view->ncols)
7362 			waddch(view->window, '\n');
7363 		if (n == s->selected && view->focussed)
7364 			wstandend(view->window);
7365 		free(line);
7366 		free(wline);
7367 		wline = NULL;
7368 		n++;
7369 		s->ndisplayed++;
7370 		s->last_displayed_entry = te;
7371 		if (--limit <= 0)
7372 			break;
7373 	}
7374 
7375 	return err;
7376 }
7377 
7378 static void
7379 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7380 {
7381 	struct got_tree_entry *te;
7382 	int isroot = s->tree == s->root;
7383 	int i = 0;
7384 
7385 	if (s->first_displayed_entry == NULL)
7386 		return;
7387 
7388 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7389 	while (i++ < maxscroll) {
7390 		if (te == NULL) {
7391 			if (!isroot)
7392 				s->first_displayed_entry = NULL;
7393 			break;
7394 		}
7395 		s->first_displayed_entry = te;
7396 		te = got_tree_entry_get_prev(s->tree, te);
7397 	}
7398 }
7399 
7400 static const struct got_error *
7401 tree_scroll_down(struct tog_view *view, int maxscroll)
7402 {
7403 	struct tog_tree_view_state *s = &view->state.tree;
7404 	struct got_tree_entry *next, *last;
7405 	int n = 0;
7406 
7407 	if (s->first_displayed_entry)
7408 		next = got_tree_entry_get_next(s->tree,
7409 		    s->first_displayed_entry);
7410 	else
7411 		next = got_object_tree_get_first_entry(s->tree);
7412 
7413 	last = s->last_displayed_entry;
7414 	while (next && n++ < maxscroll) {
7415 		if (last) {
7416 			s->last_displayed_entry = last;
7417 			last = got_tree_entry_get_next(s->tree, last);
7418 		}
7419 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7420 			s->first_displayed_entry = next;
7421 			next = got_tree_entry_get_next(s->tree, next);
7422 		}
7423 	}
7424 
7425 	return NULL;
7426 }
7427 
7428 static const struct got_error *
7429 tree_entry_path(char **path, struct tog_parent_trees *parents,
7430     struct got_tree_entry *te)
7431 {
7432 	const struct got_error *err = NULL;
7433 	struct tog_parent_tree *pt;
7434 	size_t len = 2; /* for leading slash and NUL */
7435 
7436 	TAILQ_FOREACH(pt, parents, entry)
7437 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7438 		    + 1 /* slash */;
7439 	if (te)
7440 		len += strlen(got_tree_entry_get_name(te));
7441 
7442 	*path = calloc(1, len);
7443 	if (path == NULL)
7444 		return got_error_from_errno("calloc");
7445 
7446 	(*path)[0] = '/';
7447 	pt = TAILQ_LAST(parents, tog_parent_trees);
7448 	while (pt) {
7449 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7450 		if (strlcat(*path, name, len) >= len) {
7451 			err = got_error(GOT_ERR_NO_SPACE);
7452 			goto done;
7453 		}
7454 		if (strlcat(*path, "/", len) >= len) {
7455 			err = got_error(GOT_ERR_NO_SPACE);
7456 			goto done;
7457 		}
7458 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7459 	}
7460 	if (te) {
7461 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7462 			err = got_error(GOT_ERR_NO_SPACE);
7463 			goto done;
7464 		}
7465 	}
7466 done:
7467 	if (err) {
7468 		free(*path);
7469 		*path = NULL;
7470 	}
7471 	return err;
7472 }
7473 
7474 static const struct got_error *
7475 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7476     struct got_tree_entry *te, struct tog_parent_trees *parents,
7477     struct got_object_id *commit_id, struct got_repository *repo)
7478 {
7479 	const struct got_error *err = NULL;
7480 	char *path;
7481 	struct tog_view *blame_view;
7482 
7483 	*new_view = NULL;
7484 
7485 	err = tree_entry_path(&path, parents, te);
7486 	if (err)
7487 		return err;
7488 
7489 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7490 	if (blame_view == NULL) {
7491 		err = got_error_from_errno("view_open");
7492 		goto done;
7493 	}
7494 
7495 	err = open_blame_view(blame_view, path, commit_id, repo);
7496 	if (err) {
7497 		if (err->code == GOT_ERR_CANCELLED)
7498 			err = NULL;
7499 		view_close(blame_view);
7500 	} else
7501 		*new_view = blame_view;
7502 done:
7503 	free(path);
7504 	return err;
7505 }
7506 
7507 static const struct got_error *
7508 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7509     struct tog_tree_view_state *s)
7510 {
7511 	struct tog_view *log_view;
7512 	const struct got_error *err = NULL;
7513 	char *path;
7514 
7515 	*new_view = NULL;
7516 
7517 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7518 	if (log_view == NULL)
7519 		return got_error_from_errno("view_open");
7520 
7521 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7522 	if (err)
7523 		return err;
7524 
7525 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7526 	    path, 0);
7527 	if (err)
7528 		view_close(log_view);
7529 	else
7530 		*new_view = log_view;
7531 	free(path);
7532 	return err;
7533 }
7534 
7535 static const struct got_error *
7536 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7537     const char *head_ref_name, struct got_repository *repo)
7538 {
7539 	const struct got_error *err = NULL;
7540 	char *commit_id_str = NULL;
7541 	struct tog_tree_view_state *s = &view->state.tree;
7542 	struct got_commit_object *commit = NULL;
7543 
7544 	TAILQ_INIT(&s->parents);
7545 	STAILQ_INIT(&s->colors);
7546 
7547 	s->commit_id = got_object_id_dup(commit_id);
7548 	if (s->commit_id == NULL) {
7549 		err = got_error_from_errno("got_object_id_dup");
7550 		goto done;
7551 	}
7552 
7553 	err = got_object_open_as_commit(&commit, repo, commit_id);
7554 	if (err)
7555 		goto done;
7556 
7557 	/*
7558 	 * The root is opened here and will be closed when the view is closed.
7559 	 * Any visited subtrees and their path-wise parents are opened and
7560 	 * closed on demand.
7561 	 */
7562 	err = got_object_open_as_tree(&s->root, repo,
7563 	    got_object_commit_get_tree_id(commit));
7564 	if (err)
7565 		goto done;
7566 	s->tree = s->root;
7567 
7568 	err = got_object_id_str(&commit_id_str, commit_id);
7569 	if (err != NULL)
7570 		goto done;
7571 
7572 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7573 		err = got_error_from_errno("asprintf");
7574 		goto done;
7575 	}
7576 
7577 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7578 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7579 	if (head_ref_name) {
7580 		s->head_ref_name = strdup(head_ref_name);
7581 		if (s->head_ref_name == NULL) {
7582 			err = got_error_from_errno("strdup");
7583 			goto done;
7584 		}
7585 	}
7586 	s->repo = repo;
7587 
7588 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7589 		err = add_color(&s->colors, "\\$$",
7590 		    TOG_COLOR_TREE_SUBMODULE,
7591 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7592 		if (err)
7593 			goto done;
7594 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7595 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7596 		if (err)
7597 			goto done;
7598 		err = add_color(&s->colors, "/$",
7599 		    TOG_COLOR_TREE_DIRECTORY,
7600 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7601 		if (err)
7602 			goto done;
7603 
7604 		err = add_color(&s->colors, "\\*$",
7605 		    TOG_COLOR_TREE_EXECUTABLE,
7606 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7607 		if (err)
7608 			goto done;
7609 
7610 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7611 		    get_color_value("TOG_COLOR_COMMIT"));
7612 		if (err)
7613 			goto done;
7614 	}
7615 
7616 	view->show = show_tree_view;
7617 	view->input = input_tree_view;
7618 	view->close = close_tree_view;
7619 	view->search_start = search_start_tree_view;
7620 	view->search_next = search_next_tree_view;
7621 done:
7622 	free(commit_id_str);
7623 	if (commit)
7624 		got_object_commit_close(commit);
7625 	if (err) {
7626 		if (view->close == NULL)
7627 			close_tree_view(view);
7628 		view_close(view);
7629 	}
7630 	return err;
7631 }
7632 
7633 static const struct got_error *
7634 close_tree_view(struct tog_view *view)
7635 {
7636 	struct tog_tree_view_state *s = &view->state.tree;
7637 
7638 	free_colors(&s->colors);
7639 	free(s->tree_label);
7640 	s->tree_label = NULL;
7641 	free(s->commit_id);
7642 	s->commit_id = NULL;
7643 	free(s->head_ref_name);
7644 	s->head_ref_name = NULL;
7645 	while (!TAILQ_EMPTY(&s->parents)) {
7646 		struct tog_parent_tree *parent;
7647 		parent = TAILQ_FIRST(&s->parents);
7648 		TAILQ_REMOVE(&s->parents, parent, entry);
7649 		if (parent->tree != s->root)
7650 			got_object_tree_close(parent->tree);
7651 		free(parent);
7652 
7653 	}
7654 	if (s->tree != NULL && s->tree != s->root)
7655 		got_object_tree_close(s->tree);
7656 	if (s->root)
7657 		got_object_tree_close(s->root);
7658 	return NULL;
7659 }
7660 
7661 static const struct got_error *
7662 search_start_tree_view(struct tog_view *view)
7663 {
7664 	struct tog_tree_view_state *s = &view->state.tree;
7665 
7666 	s->matched_entry = NULL;
7667 	return NULL;
7668 }
7669 
7670 static int
7671 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7672 {
7673 	regmatch_t regmatch;
7674 
7675 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7676 	    0) == 0;
7677 }
7678 
7679 static const struct got_error *
7680 search_next_tree_view(struct tog_view *view)
7681 {
7682 	struct tog_tree_view_state *s = &view->state.tree;
7683 	struct got_tree_entry *te = NULL;
7684 
7685 	if (!view->searching) {
7686 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7687 		return NULL;
7688 	}
7689 
7690 	if (s->matched_entry) {
7691 		if (view->searching == TOG_SEARCH_FORWARD) {
7692 			if (s->selected_entry)
7693 				te = got_tree_entry_get_next(s->tree,
7694 				    s->selected_entry);
7695 			else
7696 				te = got_object_tree_get_first_entry(s->tree);
7697 		} else {
7698 			if (s->selected_entry == NULL)
7699 				te = got_object_tree_get_last_entry(s->tree);
7700 			else
7701 				te = got_tree_entry_get_prev(s->tree,
7702 				    s->selected_entry);
7703 		}
7704 	} else {
7705 		if (s->selected_entry)
7706 			te = s->selected_entry;
7707 		else if (view->searching == TOG_SEARCH_FORWARD)
7708 			te = got_object_tree_get_first_entry(s->tree);
7709 		else
7710 			te = got_object_tree_get_last_entry(s->tree);
7711 	}
7712 
7713 	while (1) {
7714 		if (te == NULL) {
7715 			if (s->matched_entry == NULL) {
7716 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7717 				return NULL;
7718 			}
7719 			if (view->searching == TOG_SEARCH_FORWARD)
7720 				te = got_object_tree_get_first_entry(s->tree);
7721 			else
7722 				te = got_object_tree_get_last_entry(s->tree);
7723 		}
7724 
7725 		if (match_tree_entry(te, &view->regex)) {
7726 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7727 			s->matched_entry = te;
7728 			break;
7729 		}
7730 
7731 		if (view->searching == TOG_SEARCH_FORWARD)
7732 			te = got_tree_entry_get_next(s->tree, te);
7733 		else
7734 			te = got_tree_entry_get_prev(s->tree, te);
7735 	}
7736 
7737 	if (s->matched_entry) {
7738 		s->first_displayed_entry = s->matched_entry;
7739 		s->selected = 0;
7740 	}
7741 
7742 	return NULL;
7743 }
7744 
7745 static const struct got_error *
7746 show_tree_view(struct tog_view *view)
7747 {
7748 	const struct got_error *err = NULL;
7749 	struct tog_tree_view_state *s = &view->state.tree;
7750 	char *parent_path;
7751 
7752 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7753 	if (err)
7754 		return err;
7755 
7756 	err = draw_tree_entries(view, parent_path);
7757 	free(parent_path);
7758 
7759 	view_border(view);
7760 	return err;
7761 }
7762 
7763 static const struct got_error *
7764 tree_goto_line(struct tog_view *view, int nlines)
7765 {
7766 	const struct got_error		 *err = NULL;
7767 	struct tog_tree_view_state	 *s = &view->state.tree;
7768 	struct got_tree_entry		**fte, **lte, **ste;
7769 	int				  g, last, first = 1, i = 1;
7770 	int				  root = s->tree == s->root;
7771 	int				  off = root ? 1 : 2;
7772 
7773 	g = view->gline;
7774 	view->gline = 0;
7775 
7776 	if (g == 0)
7777 		g = 1;
7778 	else if (g > got_object_tree_get_nentries(s->tree))
7779 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7780 
7781 	fte = &s->first_displayed_entry;
7782 	lte = &s->last_displayed_entry;
7783 	ste = &s->selected_entry;
7784 
7785 	if (*fte != NULL) {
7786 		first = got_tree_entry_get_index(*fte);
7787 		first += off;  /* account for ".." */
7788 	}
7789 	last = got_tree_entry_get_index(*lte);
7790 	last += off;
7791 
7792 	if (g >= first && g <= last && g - first < nlines) {
7793 		s->selected = g - first;
7794 		return NULL;	/* gline is on the current page */
7795 	}
7796 
7797 	if (*ste != NULL) {
7798 		i = got_tree_entry_get_index(*ste);
7799 		i += off;
7800 	}
7801 
7802 	if (i < g) {
7803 		err = tree_scroll_down(view, g - i);
7804 		if (err)
7805 			return err;
7806 		if (got_tree_entry_get_index(*lte) >=
7807 		    got_object_tree_get_nentries(s->tree) - 1 &&
7808 		    first + s->selected < g &&
7809 		    s->selected < s->ndisplayed - 1) {
7810 			first = got_tree_entry_get_index(*fte);
7811 			first += off;
7812 			s->selected = g - first;
7813 		}
7814 	} else if (i > g)
7815 		tree_scroll_up(s, i - g);
7816 
7817 	if (g < nlines &&
7818 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7819 		s->selected = g - 1;
7820 
7821 	return NULL;
7822 }
7823 
7824 static const struct got_error *
7825 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7826 {
7827 	const struct got_error *err = NULL;
7828 	struct tog_tree_view_state *s = &view->state.tree;
7829 	struct got_tree_entry *te;
7830 	int n, nscroll = view->nlines - 3;
7831 
7832 	if (view->gline)
7833 		return tree_goto_line(view, nscroll);
7834 
7835 	switch (ch) {
7836 	case '0':
7837 	case '$':
7838 	case KEY_RIGHT:
7839 	case 'l':
7840 	case KEY_LEFT:
7841 	case 'h':
7842 		horizontal_scroll_input(view, ch);
7843 		break;
7844 	case 'i':
7845 		s->show_ids = !s->show_ids;
7846 		view->count = 0;
7847 		break;
7848 	case 'L':
7849 		view->count = 0;
7850 		if (!s->selected_entry)
7851 			break;
7852 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7853 		break;
7854 	case 'R':
7855 		view->count = 0;
7856 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7857 		break;
7858 	case 'g':
7859 	case '=':
7860 	case KEY_HOME:
7861 		s->selected = 0;
7862 		view->count = 0;
7863 		if (s->tree == s->root)
7864 			s->first_displayed_entry =
7865 			    got_object_tree_get_first_entry(s->tree);
7866 		else
7867 			s->first_displayed_entry = NULL;
7868 		break;
7869 	case 'G':
7870 	case '*':
7871 	case KEY_END: {
7872 		int eos = view->nlines - 3;
7873 
7874 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7875 			--eos;  /* border */
7876 		s->selected = 0;
7877 		view->count = 0;
7878 		te = got_object_tree_get_last_entry(s->tree);
7879 		for (n = 0; n < eos; n++) {
7880 			if (te == NULL) {
7881 				if (s->tree != s->root) {
7882 					s->first_displayed_entry = NULL;
7883 					n++;
7884 				}
7885 				break;
7886 			}
7887 			s->first_displayed_entry = te;
7888 			te = got_tree_entry_get_prev(s->tree, te);
7889 		}
7890 		if (n > 0)
7891 			s->selected = n - 1;
7892 		break;
7893 	}
7894 	case 'k':
7895 	case KEY_UP:
7896 	case CTRL('p'):
7897 		if (s->selected > 0) {
7898 			s->selected--;
7899 			break;
7900 		}
7901 		tree_scroll_up(s, 1);
7902 		if (s->selected_entry == NULL ||
7903 		    (s->tree == s->root && s->selected_entry ==
7904 		     got_object_tree_get_first_entry(s->tree)))
7905 			view->count = 0;
7906 		break;
7907 	case CTRL('u'):
7908 	case 'u':
7909 		nscroll /= 2;
7910 		/* FALL THROUGH */
7911 	case KEY_PPAGE:
7912 	case CTRL('b'):
7913 	case 'b':
7914 		if (s->tree == s->root) {
7915 			if (got_object_tree_get_first_entry(s->tree) ==
7916 			    s->first_displayed_entry)
7917 				s->selected -= MIN(s->selected, nscroll);
7918 		} else {
7919 			if (s->first_displayed_entry == NULL)
7920 				s->selected -= MIN(s->selected, nscroll);
7921 		}
7922 		tree_scroll_up(s, MAX(0, nscroll));
7923 		if (s->selected_entry == NULL ||
7924 		    (s->tree == s->root && s->selected_entry ==
7925 		     got_object_tree_get_first_entry(s->tree)))
7926 			view->count = 0;
7927 		break;
7928 	case 'j':
7929 	case KEY_DOWN:
7930 	case CTRL('n'):
7931 		if (s->selected < s->ndisplayed - 1) {
7932 			s->selected++;
7933 			break;
7934 		}
7935 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7936 		    == NULL) {
7937 			/* can't scroll any further */
7938 			view->count = 0;
7939 			break;
7940 		}
7941 		tree_scroll_down(view, 1);
7942 		break;
7943 	case CTRL('d'):
7944 	case 'd':
7945 		nscroll /= 2;
7946 		/* FALL THROUGH */
7947 	case KEY_NPAGE:
7948 	case CTRL('f'):
7949 	case 'f':
7950 	case ' ':
7951 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7952 		    == NULL) {
7953 			/* can't scroll any further; move cursor down */
7954 			if (s->selected < s->ndisplayed - 1)
7955 				s->selected += MIN(nscroll,
7956 				    s->ndisplayed - s->selected - 1);
7957 			else
7958 				view->count = 0;
7959 			break;
7960 		}
7961 		tree_scroll_down(view, nscroll);
7962 		break;
7963 	case KEY_ENTER:
7964 	case '\r':
7965 	case KEY_BACKSPACE:
7966 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7967 			struct tog_parent_tree *parent;
7968 			/* user selected '..' */
7969 			if (s->tree == s->root) {
7970 				view->count = 0;
7971 				break;
7972 			}
7973 			parent = TAILQ_FIRST(&s->parents);
7974 			TAILQ_REMOVE(&s->parents, parent,
7975 			    entry);
7976 			got_object_tree_close(s->tree);
7977 			s->tree = parent->tree;
7978 			s->first_displayed_entry =
7979 			    parent->first_displayed_entry;
7980 			s->selected_entry =
7981 			    parent->selected_entry;
7982 			s->selected = parent->selected;
7983 			if (s->selected > view->nlines - 3) {
7984 				err = offset_selection_down(view);
7985 				if (err)
7986 					break;
7987 			}
7988 			free(parent);
7989 		} else if (S_ISDIR(got_tree_entry_get_mode(
7990 		    s->selected_entry))) {
7991 			struct got_tree_object *subtree;
7992 			view->count = 0;
7993 			err = got_object_open_as_tree(&subtree, s->repo,
7994 			    got_tree_entry_get_id(s->selected_entry));
7995 			if (err)
7996 				break;
7997 			err = tree_view_visit_subtree(s, subtree);
7998 			if (err) {
7999 				got_object_tree_close(subtree);
8000 				break;
8001 			}
8002 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8003 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8004 		break;
8005 	case KEY_RESIZE:
8006 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8007 			s->selected = view->nlines - 4;
8008 		view->count = 0;
8009 		break;
8010 	default:
8011 		view->count = 0;
8012 		break;
8013 	}
8014 
8015 	return err;
8016 }
8017 
8018 __dead static void
8019 usage_tree(void)
8020 {
8021 	endwin();
8022 	fprintf(stderr,
8023 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8024 	    getprogname());
8025 	exit(1);
8026 }
8027 
8028 static const struct got_error *
8029 cmd_tree(int argc, char *argv[])
8030 {
8031 	const struct got_error *error;
8032 	struct got_repository *repo = NULL;
8033 	struct got_worktree *worktree = NULL;
8034 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8035 	struct got_object_id *commit_id = NULL;
8036 	struct got_commit_object *commit = NULL;
8037 	const char *commit_id_arg = NULL;
8038 	char *label = NULL;
8039 	struct got_reference *ref = NULL;
8040 	const char *head_ref_name = NULL;
8041 	int ch;
8042 	struct tog_view *view;
8043 	int *pack_fds = NULL;
8044 
8045 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8046 		switch (ch) {
8047 		case 'c':
8048 			commit_id_arg = optarg;
8049 			break;
8050 		case 'r':
8051 			repo_path = realpath(optarg, NULL);
8052 			if (repo_path == NULL)
8053 				return got_error_from_errno2("realpath",
8054 				    optarg);
8055 			break;
8056 		default:
8057 			usage_tree();
8058 			/* NOTREACHED */
8059 		}
8060 	}
8061 
8062 	argc -= optind;
8063 	argv += optind;
8064 
8065 	if (argc > 1)
8066 		usage_tree();
8067 
8068 	error = got_repo_pack_fds_open(&pack_fds);
8069 	if (error != NULL)
8070 		goto done;
8071 
8072 	if (repo_path == NULL) {
8073 		cwd = getcwd(NULL, 0);
8074 		if (cwd == NULL)
8075 			return got_error_from_errno("getcwd");
8076 		error = got_worktree_open(&worktree, cwd);
8077 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8078 			goto done;
8079 		if (worktree)
8080 			repo_path =
8081 			    strdup(got_worktree_get_repo_path(worktree));
8082 		else
8083 			repo_path = strdup(cwd);
8084 		if (repo_path == NULL) {
8085 			error = got_error_from_errno("strdup");
8086 			goto done;
8087 		}
8088 	}
8089 
8090 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8091 	if (error != NULL)
8092 		goto done;
8093 
8094 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8095 	    repo, worktree);
8096 	if (error)
8097 		goto done;
8098 
8099 	init_curses();
8100 
8101 	error = apply_unveil(got_repo_get_path(repo), NULL);
8102 	if (error)
8103 		goto done;
8104 
8105 	error = tog_load_refs(repo, 0);
8106 	if (error)
8107 		goto done;
8108 
8109 	if (commit_id_arg == NULL) {
8110 		error = got_repo_match_object_id(&commit_id, &label,
8111 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8112 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8113 		if (error)
8114 			goto done;
8115 		head_ref_name = label;
8116 	} else {
8117 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8118 		if (error == NULL)
8119 			head_ref_name = got_ref_get_name(ref);
8120 		else if (error->code != GOT_ERR_NOT_REF)
8121 			goto done;
8122 		error = got_repo_match_object_id(&commit_id, NULL,
8123 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8124 		if (error)
8125 			goto done;
8126 	}
8127 
8128 	error = got_object_open_as_commit(&commit, repo, commit_id);
8129 	if (error)
8130 		goto done;
8131 
8132 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8133 	if (view == NULL) {
8134 		error = got_error_from_errno("view_open");
8135 		goto done;
8136 	}
8137 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8138 	if (error)
8139 		goto done;
8140 	if (!got_path_is_root_dir(in_repo_path)) {
8141 		error = tree_view_walk_path(&view->state.tree, commit,
8142 		    in_repo_path);
8143 		if (error)
8144 			goto done;
8145 	}
8146 
8147 	if (worktree) {
8148 		/* Release work tree lock. */
8149 		got_worktree_close(worktree);
8150 		worktree = NULL;
8151 	}
8152 	error = view_loop(view);
8153 done:
8154 	free(repo_path);
8155 	free(cwd);
8156 	free(commit_id);
8157 	free(label);
8158 	if (ref)
8159 		got_ref_close(ref);
8160 	if (repo) {
8161 		const struct got_error *close_err = got_repo_close(repo);
8162 		if (error == NULL)
8163 			error = close_err;
8164 	}
8165 	if (pack_fds) {
8166 		const struct got_error *pack_err =
8167 		    got_repo_pack_fds_close(pack_fds);
8168 		if (error == NULL)
8169 			error = pack_err;
8170 	}
8171 	tog_free_refs();
8172 	return error;
8173 }
8174 
8175 static const struct got_error *
8176 ref_view_load_refs(struct tog_ref_view_state *s)
8177 {
8178 	struct got_reflist_entry *sre;
8179 	struct tog_reflist_entry *re;
8180 
8181 	s->nrefs = 0;
8182 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8183 		if (strncmp(got_ref_get_name(sre->ref),
8184 		    "refs/got/", 9) == 0 &&
8185 		    strncmp(got_ref_get_name(sre->ref),
8186 		    "refs/got/backup/", 16) != 0)
8187 			continue;
8188 
8189 		re = malloc(sizeof(*re));
8190 		if (re == NULL)
8191 			return got_error_from_errno("malloc");
8192 
8193 		re->ref = got_ref_dup(sre->ref);
8194 		if (re->ref == NULL)
8195 			return got_error_from_errno("got_ref_dup");
8196 		re->idx = s->nrefs++;
8197 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8198 	}
8199 
8200 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8201 	return NULL;
8202 }
8203 
8204 static void
8205 ref_view_free_refs(struct tog_ref_view_state *s)
8206 {
8207 	struct tog_reflist_entry *re;
8208 
8209 	while (!TAILQ_EMPTY(&s->refs)) {
8210 		re = TAILQ_FIRST(&s->refs);
8211 		TAILQ_REMOVE(&s->refs, re, entry);
8212 		got_ref_close(re->ref);
8213 		free(re);
8214 	}
8215 }
8216 
8217 static const struct got_error *
8218 open_ref_view(struct tog_view *view, struct got_repository *repo)
8219 {
8220 	const struct got_error *err = NULL;
8221 	struct tog_ref_view_state *s = &view->state.ref;
8222 
8223 	s->selected_entry = 0;
8224 	s->repo = repo;
8225 
8226 	TAILQ_INIT(&s->refs);
8227 	STAILQ_INIT(&s->colors);
8228 
8229 	err = ref_view_load_refs(s);
8230 	if (err)
8231 		goto done;
8232 
8233 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8234 		err = add_color(&s->colors, "^refs/heads/",
8235 		    TOG_COLOR_REFS_HEADS,
8236 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8237 		if (err)
8238 			goto done;
8239 
8240 		err = add_color(&s->colors, "^refs/tags/",
8241 		    TOG_COLOR_REFS_TAGS,
8242 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8243 		if (err)
8244 			goto done;
8245 
8246 		err = add_color(&s->colors, "^refs/remotes/",
8247 		    TOG_COLOR_REFS_REMOTES,
8248 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8249 		if (err)
8250 			goto done;
8251 
8252 		err = add_color(&s->colors, "^refs/got/backup/",
8253 		    TOG_COLOR_REFS_BACKUP,
8254 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8255 		if (err)
8256 			goto done;
8257 	}
8258 
8259 	view->show = show_ref_view;
8260 	view->input = input_ref_view;
8261 	view->close = close_ref_view;
8262 	view->search_start = search_start_ref_view;
8263 	view->search_next = search_next_ref_view;
8264 done:
8265 	if (err) {
8266 		if (view->close == NULL)
8267 			close_ref_view(view);
8268 		view_close(view);
8269 	}
8270 	return err;
8271 }
8272 
8273 static const struct got_error *
8274 close_ref_view(struct tog_view *view)
8275 {
8276 	struct tog_ref_view_state *s = &view->state.ref;
8277 
8278 	ref_view_free_refs(s);
8279 	free_colors(&s->colors);
8280 
8281 	return NULL;
8282 }
8283 
8284 static const struct got_error *
8285 resolve_reflist_entry(struct got_object_id **commit_id,
8286     struct tog_reflist_entry *re, struct got_repository *repo)
8287 {
8288 	const struct got_error *err = NULL;
8289 	struct got_object_id *obj_id;
8290 	struct got_tag_object *tag = NULL;
8291 	int obj_type;
8292 
8293 	*commit_id = NULL;
8294 
8295 	err = got_ref_resolve(&obj_id, repo, re->ref);
8296 	if (err)
8297 		return err;
8298 
8299 	err = got_object_get_type(&obj_type, repo, obj_id);
8300 	if (err)
8301 		goto done;
8302 
8303 	switch (obj_type) {
8304 	case GOT_OBJ_TYPE_COMMIT:
8305 		*commit_id = obj_id;
8306 		break;
8307 	case GOT_OBJ_TYPE_TAG:
8308 		err = got_object_open_as_tag(&tag, repo, obj_id);
8309 		if (err)
8310 			goto done;
8311 		free(obj_id);
8312 		err = got_object_get_type(&obj_type, repo,
8313 		    got_object_tag_get_object_id(tag));
8314 		if (err)
8315 			goto done;
8316 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8317 			err = got_error(GOT_ERR_OBJ_TYPE);
8318 			goto done;
8319 		}
8320 		*commit_id = got_object_id_dup(
8321 		    got_object_tag_get_object_id(tag));
8322 		if (*commit_id == NULL) {
8323 			err = got_error_from_errno("got_object_id_dup");
8324 			goto done;
8325 		}
8326 		break;
8327 	default:
8328 		err = got_error(GOT_ERR_OBJ_TYPE);
8329 		break;
8330 	}
8331 
8332 done:
8333 	if (tag)
8334 		got_object_tag_close(tag);
8335 	if (err) {
8336 		free(*commit_id);
8337 		*commit_id = NULL;
8338 	}
8339 	return err;
8340 }
8341 
8342 static const struct got_error *
8343 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8344     struct tog_reflist_entry *re, struct got_repository *repo)
8345 {
8346 	struct tog_view *log_view;
8347 	const struct got_error *err = NULL;
8348 	struct got_object_id *commit_id = NULL;
8349 
8350 	*new_view = NULL;
8351 
8352 	err = resolve_reflist_entry(&commit_id, re, repo);
8353 	if (err) {
8354 		if (err->code != GOT_ERR_OBJ_TYPE)
8355 			return err;
8356 		else
8357 			return NULL;
8358 	}
8359 
8360 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8361 	if (log_view == NULL) {
8362 		err = got_error_from_errno("view_open");
8363 		goto done;
8364 	}
8365 
8366 	err = open_log_view(log_view, commit_id, repo,
8367 	    got_ref_get_name(re->ref), "", 0);
8368 done:
8369 	if (err)
8370 		view_close(log_view);
8371 	else
8372 		*new_view = log_view;
8373 	free(commit_id);
8374 	return err;
8375 }
8376 
8377 static void
8378 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8379 {
8380 	struct tog_reflist_entry *re;
8381 	int i = 0;
8382 
8383 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8384 		return;
8385 
8386 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8387 	while (i++ < maxscroll) {
8388 		if (re == NULL)
8389 			break;
8390 		s->first_displayed_entry = re;
8391 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8392 	}
8393 }
8394 
8395 static const struct got_error *
8396 ref_scroll_down(struct tog_view *view, int maxscroll)
8397 {
8398 	struct tog_ref_view_state *s = &view->state.ref;
8399 	struct tog_reflist_entry *next, *last;
8400 	int n = 0;
8401 
8402 	if (s->first_displayed_entry)
8403 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8404 	else
8405 		next = TAILQ_FIRST(&s->refs);
8406 
8407 	last = s->last_displayed_entry;
8408 	while (next && n++ < maxscroll) {
8409 		if (last) {
8410 			s->last_displayed_entry = last;
8411 			last = TAILQ_NEXT(last, entry);
8412 		}
8413 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8414 			s->first_displayed_entry = next;
8415 			next = TAILQ_NEXT(next, entry);
8416 		}
8417 	}
8418 
8419 	return NULL;
8420 }
8421 
8422 static const struct got_error *
8423 search_start_ref_view(struct tog_view *view)
8424 {
8425 	struct tog_ref_view_state *s = &view->state.ref;
8426 
8427 	s->matched_entry = NULL;
8428 	return NULL;
8429 }
8430 
8431 static int
8432 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8433 {
8434 	regmatch_t regmatch;
8435 
8436 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8437 	    0) == 0;
8438 }
8439 
8440 static const struct got_error *
8441 search_next_ref_view(struct tog_view *view)
8442 {
8443 	struct tog_ref_view_state *s = &view->state.ref;
8444 	struct tog_reflist_entry *re = NULL;
8445 
8446 	if (!view->searching) {
8447 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8448 		return NULL;
8449 	}
8450 
8451 	if (s->matched_entry) {
8452 		if (view->searching == TOG_SEARCH_FORWARD) {
8453 			if (s->selected_entry)
8454 				re = TAILQ_NEXT(s->selected_entry, entry);
8455 			else
8456 				re = TAILQ_PREV(s->selected_entry,
8457 				    tog_reflist_head, entry);
8458 		} else {
8459 			if (s->selected_entry == NULL)
8460 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8461 			else
8462 				re = TAILQ_PREV(s->selected_entry,
8463 				    tog_reflist_head, entry);
8464 		}
8465 	} else {
8466 		if (s->selected_entry)
8467 			re = s->selected_entry;
8468 		else if (view->searching == TOG_SEARCH_FORWARD)
8469 			re = TAILQ_FIRST(&s->refs);
8470 		else
8471 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8472 	}
8473 
8474 	while (1) {
8475 		if (re == NULL) {
8476 			if (s->matched_entry == NULL) {
8477 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8478 				return NULL;
8479 			}
8480 			if (view->searching == TOG_SEARCH_FORWARD)
8481 				re = TAILQ_FIRST(&s->refs);
8482 			else
8483 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8484 		}
8485 
8486 		if (match_reflist_entry(re, &view->regex)) {
8487 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8488 			s->matched_entry = re;
8489 			break;
8490 		}
8491 
8492 		if (view->searching == TOG_SEARCH_FORWARD)
8493 			re = TAILQ_NEXT(re, entry);
8494 		else
8495 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8496 	}
8497 
8498 	if (s->matched_entry) {
8499 		s->first_displayed_entry = s->matched_entry;
8500 		s->selected = 0;
8501 	}
8502 
8503 	return NULL;
8504 }
8505 
8506 static const struct got_error *
8507 show_ref_view(struct tog_view *view)
8508 {
8509 	const struct got_error *err = NULL;
8510 	struct tog_ref_view_state *s = &view->state.ref;
8511 	struct tog_reflist_entry *re;
8512 	char *line = NULL;
8513 	wchar_t *wline;
8514 	struct tog_color *tc;
8515 	int width, n, scrollx;
8516 	int limit = view->nlines;
8517 
8518 	werase(view->window);
8519 
8520 	s->ndisplayed = 0;
8521 	if (view_is_hsplit_top(view))
8522 		--limit;  /* border */
8523 
8524 	if (limit == 0)
8525 		return NULL;
8526 
8527 	re = s->first_displayed_entry;
8528 
8529 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8530 	    s->nrefs) == -1)
8531 		return got_error_from_errno("asprintf");
8532 
8533 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8534 	if (err) {
8535 		free(line);
8536 		return err;
8537 	}
8538 	if (view_needs_focus_indication(view))
8539 		wstandout(view->window);
8540 	waddwstr(view->window, wline);
8541 	while (width++ < view->ncols)
8542 		waddch(view->window, ' ');
8543 	if (view_needs_focus_indication(view))
8544 		wstandend(view->window);
8545 	free(wline);
8546 	wline = NULL;
8547 	free(line);
8548 	line = NULL;
8549 	if (--limit <= 0)
8550 		return NULL;
8551 
8552 	n = 0;
8553 	view->maxx = 0;
8554 	while (re && limit > 0) {
8555 		char *line = NULL;
8556 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8557 
8558 		if (s->show_date) {
8559 			struct got_commit_object *ci;
8560 			struct got_tag_object *tag;
8561 			struct got_object_id *id;
8562 			struct tm tm;
8563 			time_t t;
8564 
8565 			err = got_ref_resolve(&id, s->repo, re->ref);
8566 			if (err)
8567 				return err;
8568 			err = got_object_open_as_tag(&tag, s->repo, id);
8569 			if (err) {
8570 				if (err->code != GOT_ERR_OBJ_TYPE) {
8571 					free(id);
8572 					return err;
8573 				}
8574 				err = got_object_open_as_commit(&ci, s->repo,
8575 				    id);
8576 				if (err) {
8577 					free(id);
8578 					return err;
8579 				}
8580 				t = got_object_commit_get_committer_time(ci);
8581 				got_object_commit_close(ci);
8582 			} else {
8583 				t = got_object_tag_get_tagger_time(tag);
8584 				got_object_tag_close(tag);
8585 			}
8586 			free(id);
8587 			if (gmtime_r(&t, &tm) == NULL)
8588 				return got_error_from_errno("gmtime_r");
8589 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8590 				return got_error(GOT_ERR_NO_SPACE);
8591 		}
8592 		if (got_ref_is_symbolic(re->ref)) {
8593 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8594 			    ymd : "", got_ref_get_name(re->ref),
8595 			    got_ref_get_symref_target(re->ref)) == -1)
8596 				return got_error_from_errno("asprintf");
8597 		} else if (s->show_ids) {
8598 			struct got_object_id *id;
8599 			char *id_str;
8600 			err = got_ref_resolve(&id, s->repo, re->ref);
8601 			if (err)
8602 				return err;
8603 			err = got_object_id_str(&id_str, id);
8604 			if (err) {
8605 				free(id);
8606 				return err;
8607 			}
8608 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8609 			    got_ref_get_name(re->ref), id_str) == -1) {
8610 				err = got_error_from_errno("asprintf");
8611 				free(id);
8612 				free(id_str);
8613 				return err;
8614 			}
8615 			free(id);
8616 			free(id_str);
8617 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8618 		    got_ref_get_name(re->ref)) == -1)
8619 			return got_error_from_errno("asprintf");
8620 
8621 		/* use full line width to determine view->maxx */
8622 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8623 		if (err) {
8624 			free(line);
8625 			return err;
8626 		}
8627 		view->maxx = MAX(view->maxx, width);
8628 		free(wline);
8629 		wline = NULL;
8630 
8631 		err = format_line(&wline, &width, &scrollx, line, view->x,
8632 		    view->ncols, 0, 0);
8633 		if (err) {
8634 			free(line);
8635 			return err;
8636 		}
8637 		if (n == s->selected) {
8638 			if (view->focussed)
8639 				wstandout(view->window);
8640 			s->selected_entry = re;
8641 		}
8642 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8643 		if (tc)
8644 			wattr_on(view->window,
8645 			    COLOR_PAIR(tc->colorpair), NULL);
8646 		waddwstr(view->window, &wline[scrollx]);
8647 		if (tc)
8648 			wattr_off(view->window,
8649 			    COLOR_PAIR(tc->colorpair), NULL);
8650 		if (width < view->ncols)
8651 			waddch(view->window, '\n');
8652 		if (n == s->selected && view->focussed)
8653 			wstandend(view->window);
8654 		free(line);
8655 		free(wline);
8656 		wline = NULL;
8657 		n++;
8658 		s->ndisplayed++;
8659 		s->last_displayed_entry = re;
8660 
8661 		limit--;
8662 		re = TAILQ_NEXT(re, entry);
8663 	}
8664 
8665 	view_border(view);
8666 	return err;
8667 }
8668 
8669 static const struct got_error *
8670 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8671     struct tog_reflist_entry *re, struct got_repository *repo)
8672 {
8673 	const struct got_error *err = NULL;
8674 	struct got_object_id *commit_id = NULL;
8675 	struct tog_view *tree_view;
8676 
8677 	*new_view = NULL;
8678 
8679 	err = resolve_reflist_entry(&commit_id, re, repo);
8680 	if (err) {
8681 		if (err->code != GOT_ERR_OBJ_TYPE)
8682 			return err;
8683 		else
8684 			return NULL;
8685 	}
8686 
8687 
8688 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8689 	if (tree_view == NULL) {
8690 		err = got_error_from_errno("view_open");
8691 		goto done;
8692 	}
8693 
8694 	err = open_tree_view(tree_view, commit_id,
8695 	    got_ref_get_name(re->ref), repo);
8696 	if (err)
8697 		goto done;
8698 
8699 	*new_view = tree_view;
8700 done:
8701 	free(commit_id);
8702 	return err;
8703 }
8704 
8705 static const struct got_error *
8706 ref_goto_line(struct tog_view *view, int nlines)
8707 {
8708 	const struct got_error		*err = NULL;
8709 	struct tog_ref_view_state	*s = &view->state.ref;
8710 	int				 g, idx = s->selected_entry->idx;
8711 
8712 	g = view->gline;
8713 	view->gline = 0;
8714 
8715 	if (g == 0)
8716 		g = 1;
8717 	else if (g > s->nrefs)
8718 		g = s->nrefs;
8719 
8720 	if (g >= s->first_displayed_entry->idx + 1 &&
8721 	    g <= s->last_displayed_entry->idx + 1 &&
8722 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8723 		s->selected = g - s->first_displayed_entry->idx - 1;
8724 		return NULL;
8725 	}
8726 
8727 	if (idx + 1 < g) {
8728 		err = ref_scroll_down(view, g - idx - 1);
8729 		if (err)
8730 			return err;
8731 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8732 		    s->first_displayed_entry->idx + s->selected < g &&
8733 		    s->selected < s->ndisplayed - 1)
8734 			s->selected = g - s->first_displayed_entry->idx - 1;
8735 	} else if (idx + 1 > g)
8736 		ref_scroll_up(s, idx - g + 1);
8737 
8738 	if (g < nlines && s->first_displayed_entry->idx == 0)
8739 		s->selected = g - 1;
8740 
8741 	return NULL;
8742 
8743 }
8744 
8745 static const struct got_error *
8746 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8747 {
8748 	const struct got_error *err = NULL;
8749 	struct tog_ref_view_state *s = &view->state.ref;
8750 	struct tog_reflist_entry *re;
8751 	int n, nscroll = view->nlines - 1;
8752 
8753 	if (view->gline)
8754 		return ref_goto_line(view, nscroll);
8755 
8756 	switch (ch) {
8757 	case '0':
8758 	case '$':
8759 	case KEY_RIGHT:
8760 	case 'l':
8761 	case KEY_LEFT:
8762 	case 'h':
8763 		horizontal_scroll_input(view, ch);
8764 		break;
8765 	case 'i':
8766 		s->show_ids = !s->show_ids;
8767 		view->count = 0;
8768 		break;
8769 	case 'm':
8770 		s->show_date = !s->show_date;
8771 		view->count = 0;
8772 		break;
8773 	case 'o':
8774 		s->sort_by_date = !s->sort_by_date;
8775 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8776 		view->count = 0;
8777 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8778 		    got_ref_cmp_by_commit_timestamp_descending :
8779 		    tog_ref_cmp_by_name, s->repo);
8780 		if (err)
8781 			break;
8782 		got_reflist_object_id_map_free(tog_refs_idmap);
8783 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8784 		    &tog_refs, s->repo);
8785 		if (err)
8786 			break;
8787 		ref_view_free_refs(s);
8788 		err = ref_view_load_refs(s);
8789 		break;
8790 	case KEY_ENTER:
8791 	case '\r':
8792 		view->count = 0;
8793 		if (!s->selected_entry)
8794 			break;
8795 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8796 		break;
8797 	case 'T':
8798 		view->count = 0;
8799 		if (!s->selected_entry)
8800 			break;
8801 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8802 		break;
8803 	case 'g':
8804 	case '=':
8805 	case KEY_HOME:
8806 		s->selected = 0;
8807 		view->count = 0;
8808 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8809 		break;
8810 	case 'G':
8811 	case '*':
8812 	case KEY_END: {
8813 		int eos = view->nlines - 1;
8814 
8815 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8816 			--eos;  /* border */
8817 		s->selected = 0;
8818 		view->count = 0;
8819 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8820 		for (n = 0; n < eos; n++) {
8821 			if (re == NULL)
8822 				break;
8823 			s->first_displayed_entry = re;
8824 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8825 		}
8826 		if (n > 0)
8827 			s->selected = n - 1;
8828 		break;
8829 	}
8830 	case 'k':
8831 	case KEY_UP:
8832 	case CTRL('p'):
8833 		if (s->selected > 0) {
8834 			s->selected--;
8835 			break;
8836 		}
8837 		ref_scroll_up(s, 1);
8838 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8839 			view->count = 0;
8840 		break;
8841 	case CTRL('u'):
8842 	case 'u':
8843 		nscroll /= 2;
8844 		/* FALL THROUGH */
8845 	case KEY_PPAGE:
8846 	case CTRL('b'):
8847 	case 'b':
8848 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8849 			s->selected -= MIN(nscroll, s->selected);
8850 		ref_scroll_up(s, MAX(0, nscroll));
8851 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8852 			view->count = 0;
8853 		break;
8854 	case 'j':
8855 	case KEY_DOWN:
8856 	case CTRL('n'):
8857 		if (s->selected < s->ndisplayed - 1) {
8858 			s->selected++;
8859 			break;
8860 		}
8861 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8862 			/* can't scroll any further */
8863 			view->count = 0;
8864 			break;
8865 		}
8866 		ref_scroll_down(view, 1);
8867 		break;
8868 	case CTRL('d'):
8869 	case 'd':
8870 		nscroll /= 2;
8871 		/* FALL THROUGH */
8872 	case KEY_NPAGE:
8873 	case CTRL('f'):
8874 	case 'f':
8875 	case ' ':
8876 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8877 			/* can't scroll any further; move cursor down */
8878 			if (s->selected < s->ndisplayed - 1)
8879 				s->selected += MIN(nscroll,
8880 				    s->ndisplayed - s->selected - 1);
8881 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8882 				s->selected += s->ndisplayed - s->selected - 1;
8883 			view->count = 0;
8884 			break;
8885 		}
8886 		ref_scroll_down(view, nscroll);
8887 		break;
8888 	case CTRL('l'):
8889 		view->count = 0;
8890 		tog_free_refs();
8891 		err = tog_load_refs(s->repo, s->sort_by_date);
8892 		if (err)
8893 			break;
8894 		ref_view_free_refs(s);
8895 		err = ref_view_load_refs(s);
8896 		break;
8897 	case KEY_RESIZE:
8898 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8899 			s->selected = view->nlines - 2;
8900 		break;
8901 	default:
8902 		view->count = 0;
8903 		break;
8904 	}
8905 
8906 	return err;
8907 }
8908 
8909 __dead static void
8910 usage_ref(void)
8911 {
8912 	endwin();
8913 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8914 	    getprogname());
8915 	exit(1);
8916 }
8917 
8918 static const struct got_error *
8919 cmd_ref(int argc, char *argv[])
8920 {
8921 	const struct got_error *error;
8922 	struct got_repository *repo = NULL;
8923 	struct got_worktree *worktree = NULL;
8924 	char *cwd = NULL, *repo_path = NULL;
8925 	int ch;
8926 	struct tog_view *view;
8927 	int *pack_fds = NULL;
8928 
8929 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8930 		switch (ch) {
8931 		case 'r':
8932 			repo_path = realpath(optarg, NULL);
8933 			if (repo_path == NULL)
8934 				return got_error_from_errno2("realpath",
8935 				    optarg);
8936 			break;
8937 		default:
8938 			usage_ref();
8939 			/* NOTREACHED */
8940 		}
8941 	}
8942 
8943 	argc -= optind;
8944 	argv += optind;
8945 
8946 	if (argc > 1)
8947 		usage_ref();
8948 
8949 	error = got_repo_pack_fds_open(&pack_fds);
8950 	if (error != NULL)
8951 		goto done;
8952 
8953 	if (repo_path == NULL) {
8954 		cwd = getcwd(NULL, 0);
8955 		if (cwd == NULL)
8956 			return got_error_from_errno("getcwd");
8957 		error = got_worktree_open(&worktree, cwd);
8958 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8959 			goto done;
8960 		if (worktree)
8961 			repo_path =
8962 			    strdup(got_worktree_get_repo_path(worktree));
8963 		else
8964 			repo_path = strdup(cwd);
8965 		if (repo_path == NULL) {
8966 			error = got_error_from_errno("strdup");
8967 			goto done;
8968 		}
8969 	}
8970 
8971 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8972 	if (error != NULL)
8973 		goto done;
8974 
8975 	init_curses();
8976 
8977 	error = apply_unveil(got_repo_get_path(repo), NULL);
8978 	if (error)
8979 		goto done;
8980 
8981 	error = tog_load_refs(repo, 0);
8982 	if (error)
8983 		goto done;
8984 
8985 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8986 	if (view == NULL) {
8987 		error = got_error_from_errno("view_open");
8988 		goto done;
8989 	}
8990 
8991 	error = open_ref_view(view, repo);
8992 	if (error)
8993 		goto done;
8994 
8995 	if (worktree) {
8996 		/* Release work tree lock. */
8997 		got_worktree_close(worktree);
8998 		worktree = NULL;
8999 	}
9000 	error = view_loop(view);
9001 done:
9002 	free(repo_path);
9003 	free(cwd);
9004 	if (repo) {
9005 		const struct got_error *close_err = got_repo_close(repo);
9006 		if (close_err)
9007 			error = close_err;
9008 	}
9009 	if (pack_fds) {
9010 		const struct got_error *pack_err =
9011 		    got_repo_pack_fds_close(pack_fds);
9012 		if (error == NULL)
9013 			error = pack_err;
9014 	}
9015 	tog_free_refs();
9016 	return error;
9017 }
9018 
9019 static const struct got_error*
9020 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9021     const char *str)
9022 {
9023 	size_t len;
9024 
9025 	if (win == NULL)
9026 		win = stdscr;
9027 
9028 	len = strlen(str);
9029 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9030 
9031 	if (focus)
9032 		wstandout(win);
9033 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9034 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9035 	if (focus)
9036 		wstandend(win);
9037 
9038 	return NULL;
9039 }
9040 
9041 static const struct got_error *
9042 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9043 {
9044 	off_t *p;
9045 
9046 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9047 	if (p == NULL) {
9048 		free(*line_offsets);
9049 		*line_offsets = NULL;
9050 		return got_error_from_errno("reallocarray");
9051 	}
9052 
9053 	*line_offsets = p;
9054 	(*line_offsets)[*nlines] = off;
9055 	++(*nlines);
9056 	return NULL;
9057 }
9058 
9059 static const struct got_error *
9060 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9061 {
9062 	*ret = 0;
9063 
9064 	for (;n > 0; --n, ++km) {
9065 		char	*t0, *t, *k;
9066 		size_t	 len = 1;
9067 
9068 		if (km->keys == NULL)
9069 			continue;
9070 
9071 		t = t0 = strdup(km->keys);
9072 		if (t0 == NULL)
9073 			return got_error_from_errno("strdup");
9074 
9075 		len += strlen(t);
9076 		while ((k = strsep(&t, " ")) != NULL)
9077 			len += strlen(k) > 1 ? 2 : 0;
9078 		free(t0);
9079 		*ret = MAX(*ret, len);
9080 	}
9081 
9082 	return NULL;
9083 }
9084 
9085 /*
9086  * Write keymap section headers, keys, and key info in km to f.
9087  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9088  * wrap control and symbolic keys in guillemets, else use <>.
9089  */
9090 static const struct got_error *
9091 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9092 {
9093 	int n, len = width;
9094 
9095 	if (km->keys) {
9096 		static const char *u8_glyph[] = {
9097 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9098 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9099 		};
9100 		char	*t0, *t, *k;
9101 		int	 cs, s, first = 1;
9102 
9103 		cs = got_locale_is_utf8();
9104 
9105 		t = t0 = strdup(km->keys);
9106 		if (t0 == NULL)
9107 			return got_error_from_errno("strdup");
9108 
9109 		len = strlen(km->keys);
9110 		while ((k = strsep(&t, " ")) != NULL) {
9111 			s = strlen(k) > 1;  /* control or symbolic key */
9112 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9113 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9114 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9115 			if (n < 0) {
9116 				free(t0);
9117 				return got_error_from_errno("fprintf");
9118 			}
9119 			first = 0;
9120 			len += s ? 2 : 0;
9121 			*off += n;
9122 		}
9123 		free(t0);
9124 	}
9125 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9126 	if (n < 0)
9127 		return got_error_from_errno("fprintf");
9128 	*off += n;
9129 
9130 	return NULL;
9131 }
9132 
9133 static const struct got_error *
9134 format_help(struct tog_help_view_state *s)
9135 {
9136 	const struct got_error		*err = NULL;
9137 	off_t				 off = 0;
9138 	int				 i, max, n, show = s->all;
9139 	static const struct tog_key_map	 km[] = {
9140 #define KEYMAP_(info, type)	{ NULL, (info), type }
9141 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9142 		GENERATE_HELP
9143 #undef KEYMAP_
9144 #undef KEY_
9145 	};
9146 
9147 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9148 	if (err)
9149 		return err;
9150 
9151 	n = nitems(km);
9152 	err = max_key_str(&max, km, n);
9153 	if (err)
9154 		return err;
9155 
9156 	for (i = 0; i < n; ++i) {
9157 		if (km[i].keys == NULL) {
9158 			show = s->all;
9159 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9160 			    km[i].type == s->type || s->all)
9161 				show = 1;
9162 		}
9163 		if (show) {
9164 			err = format_help_line(&off, s->f, &km[i], max);
9165 			if (err)
9166 				return err;
9167 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9168 			if (err)
9169 				return err;
9170 		}
9171 	}
9172 	fputc('\n', s->f);
9173 	++off;
9174 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9175 	return err;
9176 }
9177 
9178 static const struct got_error *
9179 create_help(struct tog_help_view_state *s)
9180 {
9181 	FILE			*f;
9182 	const struct got_error	*err;
9183 
9184 	free(s->line_offsets);
9185 	s->line_offsets = NULL;
9186 	s->nlines = 0;
9187 
9188 	f = got_opentemp();
9189 	if (f == NULL)
9190 		return got_error_from_errno("got_opentemp");
9191 	s->f = f;
9192 
9193 	err = format_help(s);
9194 	if (err)
9195 		return err;
9196 
9197 	if (s->f && fflush(s->f) != 0)
9198 		return got_error_from_errno("fflush");
9199 
9200 	return NULL;
9201 }
9202 
9203 static const struct got_error *
9204 search_start_help_view(struct tog_view *view)
9205 {
9206 	view->state.help.matched_line = 0;
9207 	return NULL;
9208 }
9209 
9210 static void
9211 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9212     size_t *nlines, int **first, int **last, int **match, int **selected)
9213 {
9214 	struct tog_help_view_state *s = &view->state.help;
9215 
9216 	*f = s->f;
9217 	*nlines = s->nlines;
9218 	*line_offsets = s->line_offsets;
9219 	*match = &s->matched_line;
9220 	*first = &s->first_displayed_line;
9221 	*last = &s->last_displayed_line;
9222 	*selected = &s->selected_line;
9223 }
9224 
9225 static const struct got_error *
9226 show_help_view(struct tog_view *view)
9227 {
9228 	struct tog_help_view_state	*s = &view->state.help;
9229 	const struct got_error		*err;
9230 	regmatch_t			*regmatch = &view->regmatch;
9231 	wchar_t				*wline;
9232 	char				*line;
9233 	ssize_t				 linelen;
9234 	size_t				 linesz = 0;
9235 	int				 width, nprinted = 0, rc = 0;
9236 	int				 eos = view->nlines;
9237 
9238 	if (view_is_hsplit_top(view))
9239 		--eos;  /* account for border */
9240 
9241 	s->lineno = 0;
9242 	rewind(s->f);
9243 	werase(view->window);
9244 
9245 	if (view->gline > s->nlines - 1)
9246 		view->gline = s->nlines - 1;
9247 
9248 	err = win_draw_center(view->window, 0, 0, view->ncols,
9249 	    view_needs_focus_indication(view),
9250 	    "tog help (press q to return to tog)");
9251 	if (err)
9252 		return err;
9253 	if (eos <= 1)
9254 		return NULL;
9255 	waddstr(view->window, "\n\n");
9256 	eos -= 2;
9257 
9258 	s->eof = 0;
9259 	view->maxx = 0;
9260 	line = NULL;
9261 	while (eos > 0 && nprinted < eos) {
9262 		attr_t attr = 0;
9263 
9264 		linelen = getline(&line, &linesz, s->f);
9265 		if (linelen == -1) {
9266 			if (!feof(s->f)) {
9267 				free(line);
9268 				return got_ferror(s->f, GOT_ERR_IO);
9269 			}
9270 			s->eof = 1;
9271 			break;
9272 		}
9273 		if (++s->lineno < s->first_displayed_line)
9274 			continue;
9275 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9276 			continue;
9277 		if (s->lineno == view->hiline)
9278 			attr = A_STANDOUT;
9279 
9280 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9281 		    view->x ? 1 : 0);
9282 		if (err) {
9283 			free(line);
9284 			return err;
9285 		}
9286 		view->maxx = MAX(view->maxx, width);
9287 		free(wline);
9288 		wline = NULL;
9289 
9290 		if (attr)
9291 			wattron(view->window, attr);
9292 		if (s->first_displayed_line + nprinted == s->matched_line &&
9293 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9294 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9295 			    view->window, view->x, regmatch);
9296 			if (err) {
9297 				free(line);
9298 				return err;
9299 			}
9300 		} else {
9301 			int skip;
9302 
9303 			err = format_line(&wline, &width, &skip, line,
9304 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9305 			if (err) {
9306 				free(line);
9307 				return err;
9308 			}
9309 			waddwstr(view->window, &wline[skip]);
9310 			free(wline);
9311 			wline = NULL;
9312 		}
9313 		if (s->lineno == view->hiline) {
9314 			while (width++ < view->ncols)
9315 				waddch(view->window, ' ');
9316 		} else {
9317 			if (width < view->ncols)
9318 				waddch(view->window, '\n');
9319 		}
9320 		if (attr)
9321 			wattroff(view->window, attr);
9322 		if (++nprinted == 1)
9323 			s->first_displayed_line = s->lineno;
9324 	}
9325 	free(line);
9326 	if (nprinted > 0)
9327 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9328 	else
9329 		s->last_displayed_line = s->first_displayed_line;
9330 
9331 	view_border(view);
9332 
9333 	if (s->eof) {
9334 		rc = waddnstr(view->window,
9335 		    "See the tog(1) manual page for full documentation",
9336 		    view->ncols - 1);
9337 		if (rc == ERR)
9338 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9339 	} else {
9340 		wmove(view->window, view->nlines - 1, 0);
9341 		wclrtoeol(view->window);
9342 		wstandout(view->window);
9343 		rc = waddnstr(view->window, "scroll down for more...",
9344 		    view->ncols - 1);
9345 		if (rc == ERR)
9346 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9347 		if (getcurx(view->window) < view->ncols - 6) {
9348 			rc = wprintw(view->window, "[%.0f%%]",
9349 			    100.00 * s->last_displayed_line / s->nlines);
9350 			if (rc == ERR)
9351 				return got_error_msg(GOT_ERR_IO, "wprintw");
9352 		}
9353 		wstandend(view->window);
9354 	}
9355 
9356 	return NULL;
9357 }
9358 
9359 static const struct got_error *
9360 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9361 {
9362 	struct tog_help_view_state	*s = &view->state.help;
9363 	const struct got_error		*err = NULL;
9364 	char				*line = NULL;
9365 	ssize_t				 linelen;
9366 	size_t				 linesz = 0;
9367 	int				 eos, nscroll;
9368 
9369 	eos = nscroll = view->nlines;
9370 	if (view_is_hsplit_top(view))
9371 		--eos;  /* border */
9372 
9373 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9374 
9375 	switch (ch) {
9376 	case '0':
9377 	case '$':
9378 	case KEY_RIGHT:
9379 	case 'l':
9380 	case KEY_LEFT:
9381 	case 'h':
9382 		horizontal_scroll_input(view, ch);
9383 		break;
9384 	case 'g':
9385 	case KEY_HOME:
9386 		s->first_displayed_line = 1;
9387 		view->count = 0;
9388 		break;
9389 	case 'G':
9390 	case KEY_END:
9391 		view->count = 0;
9392 		if (s->eof)
9393 			break;
9394 		s->first_displayed_line = (s->nlines - eos) + 3;
9395 		s->eof = 1;
9396 		break;
9397 	case 'k':
9398 	case KEY_UP:
9399 		if (s->first_displayed_line > 1)
9400 			--s->first_displayed_line;
9401 		else
9402 			view->count = 0;
9403 		break;
9404 	case CTRL('u'):
9405 	case 'u':
9406 		nscroll /= 2;
9407 		/* FALL THROUGH */
9408 	case KEY_PPAGE:
9409 	case CTRL('b'):
9410 	case 'b':
9411 		if (s->first_displayed_line == 1) {
9412 			view->count = 0;
9413 			break;
9414 		}
9415 		while (--nscroll > 0 && s->first_displayed_line > 1)
9416 			s->first_displayed_line--;
9417 		break;
9418 	case 'j':
9419 	case KEY_DOWN:
9420 	case CTRL('n'):
9421 		if (!s->eof)
9422 			++s->first_displayed_line;
9423 		else
9424 			view->count = 0;
9425 		break;
9426 	case CTRL('d'):
9427 	case 'd':
9428 		nscroll /= 2;
9429 		/* FALL THROUGH */
9430 	case KEY_NPAGE:
9431 	case CTRL('f'):
9432 	case 'f':
9433 	case ' ':
9434 		if (s->eof) {
9435 			view->count = 0;
9436 			break;
9437 		}
9438 		while (!s->eof && --nscroll > 0) {
9439 			linelen = getline(&line, &linesz, s->f);
9440 			s->first_displayed_line++;
9441 			if (linelen == -1) {
9442 				if (feof(s->f))
9443 					s->eof = 1;
9444 				else
9445 					err = got_ferror(s->f, GOT_ERR_IO);
9446 				break;
9447 			}
9448 		}
9449 		free(line);
9450 		break;
9451 	default:
9452 		view->count = 0;
9453 		break;
9454 	}
9455 
9456 	return err;
9457 }
9458 
9459 static const struct got_error *
9460 close_help_view(struct tog_view *view)
9461 {
9462 	struct tog_help_view_state *s = &view->state.help;
9463 
9464 	free(s->line_offsets);
9465 	s->line_offsets = NULL;
9466 	if (fclose(s->f) == EOF)
9467 		return got_error_from_errno("fclose");
9468 
9469 	return NULL;
9470 }
9471 
9472 static const struct got_error *
9473 reset_help_view(struct tog_view *view)
9474 {
9475 	struct tog_help_view_state *s = &view->state.help;
9476 
9477 
9478 	if (s->f && fclose(s->f) == EOF)
9479 		return got_error_from_errno("fclose");
9480 
9481 	wclear(view->window);
9482 	view->count = 0;
9483 	view->x = 0;
9484 	s->all = !s->all;
9485 	s->first_displayed_line = 1;
9486 	s->last_displayed_line = view->nlines;
9487 	s->matched_line = 0;
9488 
9489 	return create_help(s);
9490 }
9491 
9492 static const struct got_error *
9493 open_help_view(struct tog_view *view, struct tog_view *parent)
9494 {
9495 	const struct got_error		*err = NULL;
9496 	struct tog_help_view_state	*s = &view->state.help;
9497 
9498 	s->type = (enum tog_keymap_type)parent->type;
9499 	s->first_displayed_line = 1;
9500 	s->last_displayed_line = view->nlines;
9501 	s->selected_line = 1;
9502 
9503 	view->show = show_help_view;
9504 	view->input = input_help_view;
9505 	view->reset = reset_help_view;
9506 	view->close = close_help_view;
9507 	view->search_start = search_start_help_view;
9508 	view->search_setup = search_setup_help_view;
9509 	view->search_next = search_next_view_match;
9510 
9511 	err = create_help(s);
9512 	return err;
9513 }
9514 
9515 static const struct got_error *
9516 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9517     enum tog_view_type request, int y, int x)
9518 {
9519 	const struct got_error *err = NULL;
9520 
9521 	*new_view = NULL;
9522 
9523 	switch (request) {
9524 	case TOG_VIEW_DIFF:
9525 		if (view->type == TOG_VIEW_LOG) {
9526 			struct tog_log_view_state *s = &view->state.log;
9527 
9528 			err = open_diff_view_for_commit(new_view, y, x,
9529 			    s->selected_entry->commit, s->selected_entry->id,
9530 			    view, s->repo);
9531 		} else
9532 			return got_error_msg(GOT_ERR_NOT_IMPL,
9533 			    "parent/child view pair not supported");
9534 		break;
9535 	case TOG_VIEW_BLAME:
9536 		if (view->type == TOG_VIEW_TREE) {
9537 			struct tog_tree_view_state *s = &view->state.tree;
9538 
9539 			err = blame_tree_entry(new_view, y, x,
9540 			    s->selected_entry, &s->parents, s->commit_id,
9541 			    s->repo);
9542 		} else
9543 			return got_error_msg(GOT_ERR_NOT_IMPL,
9544 			    "parent/child view pair not supported");
9545 		break;
9546 	case TOG_VIEW_LOG:
9547 		if (view->type == TOG_VIEW_BLAME)
9548 			err = log_annotated_line(new_view, y, x,
9549 			    view->state.blame.repo, view->state.blame.id_to_log);
9550 		else if (view->type == TOG_VIEW_TREE)
9551 			err = log_selected_tree_entry(new_view, y, x,
9552 			    &view->state.tree);
9553 		else if (view->type == TOG_VIEW_REF)
9554 			err = log_ref_entry(new_view, y, x,
9555 			    view->state.ref.selected_entry,
9556 			    view->state.ref.repo);
9557 		else
9558 			return got_error_msg(GOT_ERR_NOT_IMPL,
9559 			    "parent/child view pair not supported");
9560 		break;
9561 	case TOG_VIEW_TREE:
9562 		if (view->type == TOG_VIEW_LOG)
9563 			err = browse_commit_tree(new_view, y, x,
9564 			    view->state.log.selected_entry,
9565 			    view->state.log.in_repo_path,
9566 			    view->state.log.head_ref_name,
9567 			    view->state.log.repo);
9568 		else if (view->type == TOG_VIEW_REF)
9569 			err = browse_ref_tree(new_view, y, x,
9570 			    view->state.ref.selected_entry,
9571 			    view->state.ref.repo);
9572 		else
9573 			return got_error_msg(GOT_ERR_NOT_IMPL,
9574 			    "parent/child view pair not supported");
9575 		break;
9576 	case TOG_VIEW_REF:
9577 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9578 		if (*new_view == NULL)
9579 			return got_error_from_errno("view_open");
9580 		if (view->type == TOG_VIEW_LOG)
9581 			err = open_ref_view(*new_view, view->state.log.repo);
9582 		else if (view->type == TOG_VIEW_TREE)
9583 			err = open_ref_view(*new_view, view->state.tree.repo);
9584 		else
9585 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9586 			    "parent/child view pair not supported");
9587 		if (err)
9588 			view_close(*new_view);
9589 		break;
9590 	case TOG_VIEW_HELP:
9591 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9592 		if (*new_view == NULL)
9593 			return got_error_from_errno("view_open");
9594 		err = open_help_view(*new_view, view);
9595 		if (err)
9596 			view_close(*new_view);
9597 		break;
9598 	default:
9599 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9600 	}
9601 
9602 	return err;
9603 }
9604 
9605 /*
9606  * If view was scrolled down to move the selected line into view when opening a
9607  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9608  */
9609 static void
9610 offset_selection_up(struct tog_view *view)
9611 {
9612 	switch (view->type) {
9613 	case TOG_VIEW_BLAME: {
9614 		struct tog_blame_view_state *s = &view->state.blame;
9615 		if (s->first_displayed_line == 1) {
9616 			s->selected_line = MAX(s->selected_line - view->offset,
9617 			    1);
9618 			break;
9619 		}
9620 		if (s->first_displayed_line > view->offset)
9621 			s->first_displayed_line -= view->offset;
9622 		else
9623 			s->first_displayed_line = 1;
9624 		s->selected_line += view->offset;
9625 		break;
9626 	}
9627 	case TOG_VIEW_LOG:
9628 		log_scroll_up(&view->state.log, view->offset);
9629 		view->state.log.selected += view->offset;
9630 		break;
9631 	case TOG_VIEW_REF:
9632 		ref_scroll_up(&view->state.ref, view->offset);
9633 		view->state.ref.selected += view->offset;
9634 		break;
9635 	case TOG_VIEW_TREE:
9636 		tree_scroll_up(&view->state.tree, view->offset);
9637 		view->state.tree.selected += view->offset;
9638 		break;
9639 	default:
9640 		break;
9641 	}
9642 
9643 	view->offset = 0;
9644 }
9645 
9646 /*
9647  * If the selected line is in the section of screen covered by the bottom split,
9648  * scroll down offset lines to move it into view and index its new position.
9649  */
9650 static const struct got_error *
9651 offset_selection_down(struct tog_view *view)
9652 {
9653 	const struct got_error	*err = NULL;
9654 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9655 	int			*selected = NULL;
9656 	int			 header, offset;
9657 
9658 	switch (view->type) {
9659 	case TOG_VIEW_BLAME: {
9660 		struct tog_blame_view_state *s = &view->state.blame;
9661 		header = 3;
9662 		scrolld = NULL;
9663 		if (s->selected_line > view->nlines - header) {
9664 			offset = abs(view->nlines - s->selected_line - header);
9665 			s->first_displayed_line += offset;
9666 			s->selected_line -= offset;
9667 			view->offset = offset;
9668 		}
9669 		break;
9670 	}
9671 	case TOG_VIEW_LOG: {
9672 		struct tog_log_view_state *s = &view->state.log;
9673 		scrolld = &log_scroll_down;
9674 		header = view_is_parent_view(view) ? 3 : 2;
9675 		selected = &s->selected;
9676 		break;
9677 	}
9678 	case TOG_VIEW_REF: {
9679 		struct tog_ref_view_state *s = &view->state.ref;
9680 		scrolld = &ref_scroll_down;
9681 		header = 3;
9682 		selected = &s->selected;
9683 		break;
9684 	}
9685 	case TOG_VIEW_TREE: {
9686 		struct tog_tree_view_state *s = &view->state.tree;
9687 		scrolld = &tree_scroll_down;
9688 		header = 5;
9689 		selected = &s->selected;
9690 		break;
9691 	}
9692 	default:
9693 		selected = NULL;
9694 		scrolld = NULL;
9695 		header = 0;
9696 		break;
9697 	}
9698 
9699 	if (selected && *selected > view->nlines - header) {
9700 		offset = abs(view->nlines - *selected - header);
9701 		view->offset = offset;
9702 		if (scrolld && offset) {
9703 			err = scrolld(view, offset);
9704 			*selected -= offset;
9705 		}
9706 	}
9707 
9708 	return err;
9709 }
9710 
9711 static void
9712 list_commands(FILE *fp)
9713 {
9714 	size_t i;
9715 
9716 	fprintf(fp, "commands:");
9717 	for (i = 0; i < nitems(tog_commands); i++) {
9718 		const struct tog_cmd *cmd = &tog_commands[i];
9719 		fprintf(fp, " %s", cmd->name);
9720 	}
9721 	fputc('\n', fp);
9722 }
9723 
9724 __dead static void
9725 usage(int hflag, int status)
9726 {
9727 	FILE *fp = (status == 0) ? stdout : stderr;
9728 
9729 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9730 	    getprogname());
9731 	if (hflag) {
9732 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9733 		list_commands(fp);
9734 	}
9735 	exit(status);
9736 }
9737 
9738 static char **
9739 make_argv(int argc, ...)
9740 {
9741 	va_list ap;
9742 	char **argv;
9743 	int i;
9744 
9745 	va_start(ap, argc);
9746 
9747 	argv = calloc(argc, sizeof(char *));
9748 	if (argv == NULL)
9749 		err(1, "calloc");
9750 	for (i = 0; i < argc; i++) {
9751 		argv[i] = strdup(va_arg(ap, char *));
9752 		if (argv[i] == NULL)
9753 			err(1, "strdup");
9754 	}
9755 
9756 	va_end(ap);
9757 	return argv;
9758 }
9759 
9760 /*
9761  * Try to convert 'tog path' into a 'tog log path' command.
9762  * The user could simply have mistyped the command rather than knowingly
9763  * provided a path. So check whether argv[0] can in fact be resolved
9764  * to a path in the HEAD commit and print a special error if not.
9765  * This hack is for mpi@ <3
9766  */
9767 static const struct got_error *
9768 tog_log_with_path(int argc, char *argv[])
9769 {
9770 	const struct got_error *error = NULL, *close_err;
9771 	const struct tog_cmd *cmd = NULL;
9772 	struct got_repository *repo = NULL;
9773 	struct got_worktree *worktree = NULL;
9774 	struct got_object_id *commit_id = NULL, *id = NULL;
9775 	struct got_commit_object *commit = NULL;
9776 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9777 	char *commit_id_str = NULL, **cmd_argv = NULL;
9778 	int *pack_fds = NULL;
9779 
9780 	cwd = getcwd(NULL, 0);
9781 	if (cwd == NULL)
9782 		return got_error_from_errno("getcwd");
9783 
9784 	error = got_repo_pack_fds_open(&pack_fds);
9785 	if (error != NULL)
9786 		goto done;
9787 
9788 	error = got_worktree_open(&worktree, cwd);
9789 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9790 		goto done;
9791 
9792 	if (worktree)
9793 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9794 	else
9795 		repo_path = strdup(cwd);
9796 	if (repo_path == NULL) {
9797 		error = got_error_from_errno("strdup");
9798 		goto done;
9799 	}
9800 
9801 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9802 	if (error != NULL)
9803 		goto done;
9804 
9805 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9806 	    repo, worktree);
9807 	if (error)
9808 		goto done;
9809 
9810 	error = tog_load_refs(repo, 0);
9811 	if (error)
9812 		goto done;
9813 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9814 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9815 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9816 	if (error)
9817 		goto done;
9818 
9819 	if (worktree) {
9820 		got_worktree_close(worktree);
9821 		worktree = NULL;
9822 	}
9823 
9824 	error = got_object_open_as_commit(&commit, repo, commit_id);
9825 	if (error)
9826 		goto done;
9827 
9828 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9829 	if (error) {
9830 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9831 			goto done;
9832 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9833 		    getprogname(), argv[0]);
9834 		usage(1, 1);
9835 		/* not reached */
9836 	}
9837 
9838 	error = got_object_id_str(&commit_id_str, commit_id);
9839 	if (error)
9840 		goto done;
9841 
9842 	cmd = &tog_commands[0]; /* log */
9843 	argc = 4;
9844 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9845 	error = cmd->cmd_main(argc, cmd_argv);
9846 done:
9847 	if (repo) {
9848 		close_err = got_repo_close(repo);
9849 		if (error == NULL)
9850 			error = close_err;
9851 	}
9852 	if (commit)
9853 		got_object_commit_close(commit);
9854 	if (worktree)
9855 		got_worktree_close(worktree);
9856 	if (pack_fds) {
9857 		const struct got_error *pack_err =
9858 		    got_repo_pack_fds_close(pack_fds);
9859 		if (error == NULL)
9860 			error = pack_err;
9861 	}
9862 	free(id);
9863 	free(commit_id_str);
9864 	free(commit_id);
9865 	free(cwd);
9866 	free(repo_path);
9867 	free(in_repo_path);
9868 	if (cmd_argv) {
9869 		int i;
9870 		for (i = 0; i < argc; i++)
9871 			free(cmd_argv[i]);
9872 		free(cmd_argv);
9873 	}
9874 	tog_free_refs();
9875 	return error;
9876 }
9877 
9878 int
9879 main(int argc, char *argv[])
9880 {
9881 	const struct got_error *io_err, *error = NULL;
9882 	const struct tog_cmd *cmd = NULL;
9883 	int ch, hflag = 0, Vflag = 0;
9884 	char **cmd_argv = NULL;
9885 	static const struct option longopts[] = {
9886 	    { "version", no_argument, NULL, 'V' },
9887 	    { NULL, 0, NULL, 0}
9888 	};
9889 	char *diff_algo_str = NULL;
9890 	const char *test_script_path;
9891 
9892 	setlocale(LC_CTYPE, "");
9893 
9894 	/*
9895 	 * Test mode init must happen before pledge() because "tty" will
9896 	 * not allow TTY-related ioctls to occur via regular files.
9897 	 */
9898 	test_script_path = getenv("TOG_TEST_SCRIPT");
9899 	if (test_script_path != NULL) {
9900 		error = init_mock_term(test_script_path);
9901 		if (error) {
9902 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9903 			return 1;
9904 		}
9905 	} else if (!isatty(STDIN_FILENO))
9906 		errx(1, "standard input is not a tty");
9907 
9908 #if !defined(PROFILE)
9909 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9910 	    NULL) == -1)
9911 		err(1, "pledge");
9912 #endif
9913 
9914 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9915 		switch (ch) {
9916 		case 'h':
9917 			hflag = 1;
9918 			break;
9919 		case 'V':
9920 			Vflag = 1;
9921 			break;
9922 		default:
9923 			usage(hflag, 1);
9924 			/* NOTREACHED */
9925 		}
9926 	}
9927 
9928 	argc -= optind;
9929 	argv += optind;
9930 	optind = 1;
9931 	optreset = 1;
9932 
9933 	if (Vflag) {
9934 		got_version_print_str();
9935 		return 0;
9936 	}
9937 
9938 	if (argc == 0) {
9939 		if (hflag)
9940 			usage(hflag, 0);
9941 		/* Build an argument vector which runs a default command. */
9942 		cmd = &tog_commands[0];
9943 		argc = 1;
9944 		cmd_argv = make_argv(argc, cmd->name);
9945 	} else {
9946 		size_t i;
9947 
9948 		/* Did the user specify a command? */
9949 		for (i = 0; i < nitems(tog_commands); i++) {
9950 			if (strncmp(tog_commands[i].name, argv[0],
9951 			    strlen(argv[0])) == 0) {
9952 				cmd = &tog_commands[i];
9953 				break;
9954 			}
9955 		}
9956 	}
9957 
9958 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9959 	if (diff_algo_str) {
9960 		if (strcasecmp(diff_algo_str, "patience") == 0)
9961 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
9962 		if (strcasecmp(diff_algo_str, "myers") == 0)
9963 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
9964 	}
9965 
9966 	if (cmd == NULL) {
9967 		if (argc != 1)
9968 			usage(0, 1);
9969 		/* No command specified; try log with a path */
9970 		error = tog_log_with_path(argc, argv);
9971 	} else {
9972 		if (hflag)
9973 			cmd->cmd_usage();
9974 		else
9975 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
9976 	}
9977 
9978 	if (using_mock_io) {
9979 		io_err = tog_io_close();
9980 		if (error == NULL)
9981 			error = io_err;
9982 	}
9983 	endwin();
9984 	if (cmd_argv) {
9985 		int i;
9986 		for (i = 0; i < argc; i++)
9987 			free(cmd_argv[i]);
9988 		free(cmd_argv);
9989 	}
9990 
9991 	if (error && error->code != GOT_ERR_CANCELLED &&
9992 	    error->code != GOT_ERR_EOF &&
9993 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
9994 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
9995 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR))
9996 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9997 	return 0;
9998 }