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 #include "got_keyword.h"
62 
63 #ifndef MIN
64 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
65 #endif
66 
67 #ifndef MAX
68 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
69 #endif
70 
71 #ifndef CTRL
72 #define CTRL(x)		((x) & 0x1f)
73 #endif
74 
75 #ifndef nitems
76 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
77 #endif
78 
79 struct tog_cmd {
80 	const char *name;
81 	const struct got_error *(*cmd_main)(int, char *[]);
82 	void (*cmd_usage)(void);
83 };
84 
85 __dead static void	usage(int, int);
86 __dead static void	usage_log(void);
87 __dead static void	usage_diff(void);
88 __dead static void	usage_blame(void);
89 __dead static void	usage_tree(void);
90 __dead static void	usage_ref(void);
91 
92 static const struct got_error*	cmd_log(int, char *[]);
93 static const struct got_error*	cmd_diff(int, char *[]);
94 static const struct got_error*	cmd_blame(int, char *[]);
95 static const struct got_error*	cmd_tree(int, char *[]);
96 static const struct got_error*	cmd_ref(int, char *[]);
97 
98 static const struct tog_cmd tog_commands[] = {
99 	{ "log",	cmd_log,	usage_log },
100 	{ "diff",	cmd_diff,	usage_diff },
101 	{ "blame",	cmd_blame,	usage_blame },
102 	{ "tree",	cmd_tree,	usage_tree },
103 	{ "ref",	cmd_ref,	usage_ref },
104 };
105 
106 enum tog_view_type {
107 	TOG_VIEW_DIFF,
108 	TOG_VIEW_LOG,
109 	TOG_VIEW_BLAME,
110 	TOG_VIEW_TREE,
111 	TOG_VIEW_REF,
112 	TOG_VIEW_HELP
113 };
114 
115 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
116 enum tog_keymap_type {
117 	TOG_KEYMAP_KEYS = -2,
118 	TOG_KEYMAP_GLOBAL,
119 	TOG_KEYMAP_DIFF,
120 	TOG_KEYMAP_LOG,
121 	TOG_KEYMAP_BLAME,
122 	TOG_KEYMAP_TREE,
123 	TOG_KEYMAP_REF,
124 	TOG_KEYMAP_HELP
125 };
126 
127 enum tog_view_mode {
128 	TOG_VIEW_SPLIT_NONE,
129 	TOG_VIEW_SPLIT_VERT,
130 	TOG_VIEW_SPLIT_HRZN
131 };
132 
133 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
134 
135 #define TOG_EOF_STRING	"(END)"
136 
137 struct commit_queue_entry {
138 	TAILQ_ENTRY(commit_queue_entry) entry;
139 	struct got_object_id *id;
140 	struct got_commit_object *commit;
141 	int idx;
142 };
143 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
144 struct commit_queue {
145 	int ncommits;
146 	struct commit_queue_head head;
147 };
148 
149 struct tog_color {
150 	STAILQ_ENTRY(tog_color) entry;
151 	regex_t regex;
152 	short colorpair;
153 };
154 STAILQ_HEAD(tog_colors, tog_color);
155 
156 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
157 static struct got_reflist_object_id_map *tog_refs_idmap;
158 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
159 
160 static const struct got_error *
161 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
162     struct got_reference* re2)
163 {
164 	const char *name1 = got_ref_get_name(re1);
165 	const char *name2 = got_ref_get_name(re2);
166 	int isbackup1, isbackup2;
167 
168 	/* Sort backup refs towards the bottom of the list. */
169 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
170 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
171 	if (!isbackup1 && isbackup2) {
172 		*cmp = -1;
173 		return NULL;
174 	} else if (isbackup1 && !isbackup2) {
175 		*cmp = 1;
176 		return NULL;
177 	}
178 
179 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
180 	return NULL;
181 }
182 
183 static const struct got_error *
184 tog_load_refs(struct got_repository *repo, int sort_by_date)
185 {
186 	const struct got_error *err;
187 
188 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
189 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
190 	    repo);
191 	if (err)
192 		return err;
193 
194 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
195 	    repo);
196 }
197 
198 static void
199 tog_free_refs(void)
200 {
201 	if (tog_refs_idmap) {
202 		got_reflist_object_id_map_free(tog_refs_idmap);
203 		tog_refs_idmap = NULL;
204 	}
205 	got_ref_list_free(&tog_refs);
206 }
207 
208 static const struct got_error *
209 add_color(struct tog_colors *colors, const char *pattern,
210     int idx, short color)
211 {
212 	const struct got_error *err = NULL;
213 	struct tog_color *tc;
214 	int regerr = 0;
215 
216 	if (idx < 1 || idx > COLOR_PAIRS - 1)
217 		return NULL;
218 
219 	init_pair(idx, color, -1);
220 
221 	tc = calloc(1, sizeof(*tc));
222 	if (tc == NULL)
223 		return got_error_from_errno("calloc");
224 	regerr = regcomp(&tc->regex, pattern,
225 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
226 	if (regerr) {
227 		static char regerr_msg[512];
228 		static char err_msg[512];
229 		regerror(regerr, &tc->regex, regerr_msg,
230 		    sizeof(regerr_msg));
231 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
232 		    regerr_msg);
233 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
234 		free(tc);
235 		return err;
236 	}
237 	tc->colorpair = idx;
238 	STAILQ_INSERT_HEAD(colors, tc, entry);
239 	return NULL;
240 }
241 
242 static void
243 free_colors(struct tog_colors *colors)
244 {
245 	struct tog_color *tc;
246 
247 	while (!STAILQ_EMPTY(colors)) {
248 		tc = STAILQ_FIRST(colors);
249 		STAILQ_REMOVE_HEAD(colors, entry);
250 		regfree(&tc->regex);
251 		free(tc);
252 	}
253 }
254 
255 static struct tog_color *
256 get_color(struct tog_colors *colors, int colorpair)
257 {
258 	struct tog_color *tc = NULL;
259 
260 	STAILQ_FOREACH(tc, colors, entry) {
261 		if (tc->colorpair == colorpair)
262 			return tc;
263 	}
264 
265 	return NULL;
266 }
267 
268 static int
269 default_color_value(const char *envvar)
270 {
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
272 		return COLOR_MAGENTA;
273 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
274 		return COLOR_CYAN;
275 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
276 		return COLOR_YELLOW;
277 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
278 		return COLOR_GREEN;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
280 		return COLOR_MAGENTA;
281 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
284 		return COLOR_CYAN;
285 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
286 		return COLOR_GREEN;
287 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
288 		return COLOR_GREEN;
289 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
290 		return COLOR_CYAN;
291 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
292 		return COLOR_YELLOW;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
294 		return COLOR_GREEN;
295 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
296 		return COLOR_MAGENTA;
297 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
298 		return COLOR_YELLOW;
299 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
300 		return COLOR_CYAN;
301 
302 	return -1;
303 }
304 
305 static int
306 get_color_value(const char *envvar)
307 {
308 	const char *val = getenv(envvar);
309 
310 	if (val == NULL)
311 		return default_color_value(envvar);
312 
313 	if (strcasecmp(val, "black") == 0)
314 		return COLOR_BLACK;
315 	if (strcasecmp(val, "red") == 0)
316 		return COLOR_RED;
317 	if (strcasecmp(val, "green") == 0)
318 		return COLOR_GREEN;
319 	if (strcasecmp(val, "yellow") == 0)
320 		return COLOR_YELLOW;
321 	if (strcasecmp(val, "blue") == 0)
322 		return COLOR_BLUE;
323 	if (strcasecmp(val, "magenta") == 0)
324 		return COLOR_MAGENTA;
325 	if (strcasecmp(val, "cyan") == 0)
326 		return COLOR_CYAN;
327 	if (strcasecmp(val, "white") == 0)
328 		return COLOR_WHITE;
329 	if (strcasecmp(val, "default") == 0)
330 		return -1;
331 
332 	return default_color_value(envvar);
333 }
334 
335 struct tog_diff_view_state {
336 	struct got_object_id *id1, *id2;
337 	const char *label1, *label2;
338 	FILE *f, *f1, *f2;
339 	int fd1, fd2;
340 	int lineno;
341 	int first_displayed_line;
342 	int last_displayed_line;
343 	int eof;
344 	int diff_context;
345 	int ignore_whitespace;
346 	int force_text_diff;
347 	struct got_repository *repo;
348 	struct got_diff_line *lines;
349 	size_t nlines;
350 	int matched_line;
351 	int selected_line;
352 
353 	/* passed from log or blame view; may be NULL */
354 	struct tog_view *parent_view;
355 };
356 
357 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
358 static volatile sig_atomic_t tog_thread_error;
359 
360 struct tog_log_thread_args {
361 	pthread_cond_t need_commits;
362 	pthread_cond_t commit_loaded;
363 	int commits_needed;
364 	int load_all;
365 	struct got_commit_graph *graph;
366 	struct commit_queue *real_commits;
367 	const char *in_repo_path;
368 	struct got_object_id *start_id;
369 	struct got_repository *repo;
370 	int *pack_fds;
371 	int log_complete;
372 	sig_atomic_t *quit;
373 	struct commit_queue_entry **first_displayed_entry;
374 	struct commit_queue_entry **selected_entry;
375 	int *searching;
376 	int *search_next_done;
377 	regex_t *regex;
378 	int *limiting;
379 	int limit_match;
380 	regex_t *limit_regex;
381 	struct commit_queue *limit_commits;
382 };
383 
384 struct tog_log_view_state {
385 	struct commit_queue *commits;
386 	struct commit_queue_entry *first_displayed_entry;
387 	struct commit_queue_entry *last_displayed_entry;
388 	struct commit_queue_entry *selected_entry;
389 	struct commit_queue real_commits;
390 	int selected;
391 	char *in_repo_path;
392 	char *head_ref_name;
393 	int log_branches;
394 	struct got_repository *repo;
395 	struct got_object_id *start_id;
396 	sig_atomic_t quit;
397 	pthread_t thread;
398 	struct tog_log_thread_args thread_args;
399 	struct commit_queue_entry *matched_entry;
400 	struct commit_queue_entry *search_entry;
401 	struct tog_colors colors;
402 	int use_committer;
403 	int limit_view;
404 	regex_t limit_regex;
405 	struct commit_queue limit_commits;
406 };
407 
408 #define TOG_COLOR_DIFF_MINUS		1
409 #define TOG_COLOR_DIFF_PLUS		2
410 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
411 #define TOG_COLOR_DIFF_META		4
412 #define TOG_COLOR_TREE_SUBMODULE	5
413 #define TOG_COLOR_TREE_SYMLINK		6
414 #define TOG_COLOR_TREE_DIRECTORY	7
415 #define TOG_COLOR_TREE_EXECUTABLE	8
416 #define TOG_COLOR_COMMIT		9
417 #define TOG_COLOR_AUTHOR		10
418 #define TOG_COLOR_DATE			11
419 #define TOG_COLOR_REFS_HEADS		12
420 #define TOG_COLOR_REFS_TAGS		13
421 #define TOG_COLOR_REFS_REMOTES		14
422 #define TOG_COLOR_REFS_BACKUP		15
423 
424 struct tog_blame_cb_args {
425 	struct tog_blame_line *lines; /* one per line */
426 	int nlines;
427 
428 	struct tog_view *view;
429 	struct got_object_id *commit_id;
430 	int *quit;
431 };
432 
433 struct tog_blame_thread_args {
434 	const char *path;
435 	struct got_repository *repo;
436 	struct tog_blame_cb_args *cb_args;
437 	int *complete;
438 	got_cancel_cb cancel_cb;
439 	void *cancel_arg;
440 	pthread_cond_t blame_complete;
441 };
442 
443 struct tog_blame {
444 	FILE *f;
445 	off_t filesize;
446 	struct tog_blame_line *lines;
447 	int nlines;
448 	off_t *line_offsets;
449 	pthread_t thread;
450 	struct tog_blame_thread_args thread_args;
451 	struct tog_blame_cb_args cb_args;
452 	const char *path;
453 	int *pack_fds;
454 };
455 
456 struct tog_blame_view_state {
457 	int first_displayed_line;
458 	int last_displayed_line;
459 	int selected_line;
460 	int last_diffed_line;
461 	int blame_complete;
462 	int eof;
463 	int done;
464 	struct got_object_id_queue blamed_commits;
465 	struct got_object_qid *blamed_commit;
466 	char *path;
467 	struct got_repository *repo;
468 	struct got_object_id *commit_id;
469 	struct got_object_id *id_to_log;
470 	struct tog_blame blame;
471 	int matched_line;
472 	struct tog_colors colors;
473 };
474 
475 struct tog_parent_tree {
476 	TAILQ_ENTRY(tog_parent_tree) entry;
477 	struct got_tree_object *tree;
478 	struct got_tree_entry *first_displayed_entry;
479 	struct got_tree_entry *selected_entry;
480 	int selected;
481 };
482 
483 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
484 
485 struct tog_tree_view_state {
486 	char *tree_label;
487 	struct got_object_id *commit_id;/* commit which this tree belongs to */
488 	struct got_tree_object *root;	/* the commit's root tree entry */
489 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
490 	struct got_tree_entry *first_displayed_entry;
491 	struct got_tree_entry *last_displayed_entry;
492 	struct got_tree_entry *selected_entry;
493 	int ndisplayed, selected, show_ids;
494 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
495 	char *head_ref_name;
496 	struct got_repository *repo;
497 	struct got_tree_entry *matched_entry;
498 	struct tog_colors colors;
499 };
500 
501 struct tog_reflist_entry {
502 	TAILQ_ENTRY(tog_reflist_entry) entry;
503 	struct got_reference *ref;
504 	int idx;
505 };
506 
507 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
508 
509 struct tog_ref_view_state {
510 	struct tog_reflist_head refs;
511 	struct tog_reflist_entry *first_displayed_entry;
512 	struct tog_reflist_entry *last_displayed_entry;
513 	struct tog_reflist_entry *selected_entry;
514 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
515 	struct got_repository *repo;
516 	struct tog_reflist_entry *matched_entry;
517 	struct tog_colors colors;
518 };
519 
520 struct tog_help_view_state {
521 	FILE			*f;
522 	off_t			*line_offsets;
523 	size_t			 nlines;
524 	int			 lineno;
525 	int			 first_displayed_line;
526 	int			 last_displayed_line;
527 	int			 eof;
528 	int			 matched_line;
529 	int			 selected_line;
530 	int			 all;
531 	enum tog_keymap_type	 type;
532 };
533 
534 #define GENERATE_HELP \
535 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
536 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
537 	KEY_("k C-p Up", "Move cursor or page up one line"), \
538 	KEY_("j C-n Down", "Move cursor or page down one line"), \
539 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
540 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
541 	KEY_("C-u u", "Scroll the view up one half page"), \
542 	KEY_("C-d d", "Scroll the view down one half page"), \
543 	KEY_("g", "Go to line N (default: first line)"), \
544 	KEY_("Home =", "Go to the first line"), \
545 	KEY_("G", "Go to line N (default: last line)"), \
546 	KEY_("End *", "Go to the last line"), \
547 	KEY_("l Right", "Scroll the view right"), \
548 	KEY_("h Left", "Scroll the view left"), \
549 	KEY_("$", "Scroll view to the rightmost position"), \
550 	KEY_("0", "Scroll view to the leftmost position"), \
551 	KEY_("-", "Decrease size of the focussed split"), \
552 	KEY_("+", "Increase size of the focussed split"), \
553 	KEY_("Tab", "Switch focus between views"), \
554 	KEY_("F", "Toggle fullscreen mode"), \
555 	KEY_("S", "Switch split-screen layout"), \
556 	KEY_("/", "Open prompt to enter search term"), \
557 	KEY_("n", "Find next line/token matching the current search term"), \
558 	KEY_("N", "Find previous line/token matching the current search term"),\
559 	KEY_("q", "Quit the focussed view; Quit help screen"), \
560 	KEY_("Q", "Quit tog"), \
561 	\
562 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
563 	KEY_("< ,", "Move cursor up one commit"), \
564 	KEY_("> .", "Move cursor down one commit"), \
565 	KEY_("Enter", "Open diff view of the selected commit"), \
566 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
567 	KEY_("R", "Open ref view of all repository references"), \
568 	KEY_("T", "Display tree view of the repository from the selected" \
569 	    " commit"), \
570 	KEY_("@", "Toggle between displaying author and committer name"), \
571 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
572 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
573 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
574 	\
575 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
576 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
577 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
578 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
579 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
580 	    " data"), \
581 	KEY_("(", "Go to the previous file in the diff"), \
582 	KEY_(")", "Go to the next file in the diff"), \
583 	KEY_("{", "Go to the previous hunk in the diff"), \
584 	KEY_("}", "Go to the next hunk in the diff"), \
585 	KEY_("[", "Decrease the number of context lines"), \
586 	KEY_("]", "Increase the number of context lines"), \
587 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
588 	\
589 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
590 	KEY_("Enter", "Display diff view of the selected line's commit"), \
591 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
592 	KEY_("L", "Open log view for the currently selected annotated line"), \
593 	KEY_("C", "Reload view with the previously blamed commit"), \
594 	KEY_("c", "Reload view with the version of the file found in the" \
595 	    " selected line's commit"), \
596 	KEY_("p", "Reload view with the version of the file found in the" \
597 	    " selected line's parent commit"), \
598 	\
599 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
600 	KEY_("Enter", "Enter selected directory or open blame view of the" \
601 	    " selected file"), \
602 	KEY_("L", "Open log view for the selected entry"), \
603 	KEY_("R", "Open ref view of all repository references"), \
604 	KEY_("i", "Show object IDs for all tree entries"), \
605 	KEY_("Backspace", "Return to the parent directory"), \
606 	\
607 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
608 	KEY_("Enter", "Display log view of the selected reference"), \
609 	KEY_("T", "Display tree view of the selected reference"), \
610 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
611 	KEY_("m", "Toggle display of last modified date for each reference"), \
612 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
613 	KEY_("C-l", "Reload view with all repository references")
614 
615 struct tog_key_map {
616 	const char		*keys;
617 	const char		*info;
618 	enum tog_keymap_type	 type;
619 };
620 
621 /* curses io for tog regress */
622 struct tog_io {
623 	FILE	*cin;
624 	FILE	*cout;
625 	FILE	*f;
626 	FILE	*sdump;
627 	int	 wait_for_ui;
628 } tog_io;
629 static int using_mock_io;
630 
631 #define TOG_KEY_SCRDUMP	SHRT_MIN
632 
633 /*
634  * We implement two types of views: parent views and child views.
635  *
636  * The 'Tab' key switches focus between a parent view and its child view.
637  * Child views are shown side-by-side to their parent view, provided
638  * there is enough screen estate.
639  *
640  * When a new view is opened from within a parent view, this new view
641  * becomes a child view of the parent view, replacing any existing child.
642  *
643  * When a new view is opened from within a child view, this new view
644  * becomes a parent view which will obscure the views below until the
645  * user quits the new parent view by typing 'q'.
646  *
647  * This list of views contains parent views only.
648  * Child views are only pointed to by their parent view.
649  */
650 TAILQ_HEAD(tog_view_list_head, tog_view);
651 
652 struct tog_view {
653 	TAILQ_ENTRY(tog_view) entry;
654 	WINDOW *window;
655 	PANEL *panel;
656 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
657 	int resized_y, resized_x; /* begin_y/x based on user resizing */
658 	int maxx, x; /* max column and current start column */
659 	int lines, cols; /* copies of LINES and COLS */
660 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
661 	int gline, hiline; /* navigate to and highlight this nG line */
662 	int ch, count; /* current keymap and count prefix */
663 	int resized; /* set when in a resize event */
664 	int focussed; /* Only set on one parent or child view at a time. */
665 	int dying;
666 	struct tog_view *parent;
667 	struct tog_view *child;
668 
669 	/*
670 	 * This flag is initially set on parent views when a new child view
671 	 * is created. It gets toggled when the 'Tab' key switches focus
672 	 * between parent and child.
673 	 * The flag indicates whether focus should be passed on to our child
674 	 * view if this parent view gets picked for focus after another parent
675 	 * view was closed. This prevents child views from losing focus in such
676 	 * situations.
677 	 */
678 	int focus_child;
679 
680 	enum tog_view_mode mode;
681 	/* type-specific state */
682 	enum tog_view_type type;
683 	union {
684 		struct tog_diff_view_state diff;
685 		struct tog_log_view_state log;
686 		struct tog_blame_view_state blame;
687 		struct tog_tree_view_state tree;
688 		struct tog_ref_view_state ref;
689 		struct tog_help_view_state help;
690 	} state;
691 
692 	const struct got_error *(*show)(struct tog_view *);
693 	const struct got_error *(*input)(struct tog_view **,
694 	    struct tog_view *, int);
695 	const struct got_error *(*reset)(struct tog_view *);
696 	const struct got_error *(*resize)(struct tog_view *, int);
697 	const struct got_error *(*close)(struct tog_view *);
698 
699 	const struct got_error *(*search_start)(struct tog_view *);
700 	const struct got_error *(*search_next)(struct tog_view *);
701 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
702 	    int **, int **, int **, int **);
703 	int search_started;
704 	int searching;
705 #define TOG_SEARCH_FORWARD	1
706 #define TOG_SEARCH_BACKWARD	2
707 	int search_next_done;
708 #define TOG_SEARCH_HAVE_MORE	1
709 #define TOG_SEARCH_NO_MORE	2
710 #define TOG_SEARCH_HAVE_NONE	3
711 	regex_t regex;
712 	regmatch_t regmatch;
713 	const char *action;
714 };
715 
716 static const struct got_error *open_diff_view(struct tog_view *,
717     struct got_object_id *, struct got_object_id *,
718     const char *, const char *, int, int, int, struct tog_view *,
719     struct got_repository *);
720 static const struct got_error *show_diff_view(struct tog_view *);
721 static const struct got_error *input_diff_view(struct tog_view **,
722     struct tog_view *, int);
723 static const struct got_error *reset_diff_view(struct tog_view *);
724 static const struct got_error* close_diff_view(struct tog_view *);
725 static const struct got_error *search_start_diff_view(struct tog_view *);
726 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
727     size_t *, int **, int **, int **, int **);
728 static const struct got_error *search_next_view_match(struct tog_view *);
729 
730 static const struct got_error *open_log_view(struct tog_view *,
731     struct got_object_id *, struct got_repository *,
732     const char *, const char *, int);
733 static const struct got_error * show_log_view(struct tog_view *);
734 static const struct got_error *input_log_view(struct tog_view **,
735     struct tog_view *, int);
736 static const struct got_error *resize_log_view(struct tog_view *, int);
737 static const struct got_error *close_log_view(struct tog_view *);
738 static const struct got_error *search_start_log_view(struct tog_view *);
739 static const struct got_error *search_next_log_view(struct tog_view *);
740 
741 static const struct got_error *open_blame_view(struct tog_view *, char *,
742     struct got_object_id *, struct got_repository *);
743 static const struct got_error *show_blame_view(struct tog_view *);
744 static const struct got_error *input_blame_view(struct tog_view **,
745     struct tog_view *, int);
746 static const struct got_error *reset_blame_view(struct tog_view *);
747 static const struct got_error *close_blame_view(struct tog_view *);
748 static const struct got_error *search_start_blame_view(struct tog_view *);
749 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
750     size_t *, int **, int **, int **, int **);
751 
752 static const struct got_error *open_tree_view(struct tog_view *,
753     struct got_object_id *, const char *, struct got_repository *);
754 static const struct got_error *show_tree_view(struct tog_view *);
755 static const struct got_error *input_tree_view(struct tog_view **,
756     struct tog_view *, int);
757 static const struct got_error *close_tree_view(struct tog_view *);
758 static const struct got_error *search_start_tree_view(struct tog_view *);
759 static const struct got_error *search_next_tree_view(struct tog_view *);
760 
761 static const struct got_error *open_ref_view(struct tog_view *,
762     struct got_repository *);
763 static const struct got_error *show_ref_view(struct tog_view *);
764 static const struct got_error *input_ref_view(struct tog_view **,
765     struct tog_view *, int);
766 static const struct got_error *close_ref_view(struct tog_view *);
767 static const struct got_error *search_start_ref_view(struct tog_view *);
768 static const struct got_error *search_next_ref_view(struct tog_view *);
769 
770 static const struct got_error *open_help_view(struct tog_view *,
771     struct tog_view *);
772 static const struct got_error *show_help_view(struct tog_view *);
773 static const struct got_error *input_help_view(struct tog_view **,
774     struct tog_view *, int);
775 static const struct got_error *reset_help_view(struct tog_view *);
776 static const struct got_error* close_help_view(struct tog_view *);
777 static const struct got_error *search_start_help_view(struct tog_view *);
778 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
779     size_t *, int **, int **, int **, int **);
780 
781 static volatile sig_atomic_t tog_sigwinch_received;
782 static volatile sig_atomic_t tog_sigpipe_received;
783 static volatile sig_atomic_t tog_sigcont_received;
784 static volatile sig_atomic_t tog_sigint_received;
785 static volatile sig_atomic_t tog_sigterm_received;
786 
787 static void
788 tog_sigwinch(int signo)
789 {
790 	tog_sigwinch_received = 1;
791 }
792 
793 static void
794 tog_sigpipe(int signo)
795 {
796 	tog_sigpipe_received = 1;
797 }
798 
799 static void
800 tog_sigcont(int signo)
801 {
802 	tog_sigcont_received = 1;
803 }
804 
805 static void
806 tog_sigint(int signo)
807 {
808 	tog_sigint_received = 1;
809 }
810 
811 static void
812 tog_sigterm(int signo)
813 {
814 	tog_sigterm_received = 1;
815 }
816 
817 static int
818 tog_fatal_signal_received(void)
819 {
820 	return (tog_sigpipe_received ||
821 	    tog_sigint_received || tog_sigterm_received);
822 }
823 
824 static const struct got_error *
825 view_close(struct tog_view *view)
826 {
827 	const struct got_error *err = NULL, *child_err = NULL;
828 
829 	if (view->child) {
830 		child_err = view_close(view->child);
831 		view->child = NULL;
832 	}
833 	if (view->close)
834 		err = view->close(view);
835 	if (view->panel)
836 		del_panel(view->panel);
837 	if (view->window)
838 		delwin(view->window);
839 	free(view);
840 	return err ? err : child_err;
841 }
842 
843 static struct tog_view *
844 view_open(int nlines, int ncols, int begin_y, int begin_x,
845     enum tog_view_type type)
846 {
847 	struct tog_view *view = calloc(1, sizeof(*view));
848 
849 	if (view == NULL)
850 		return NULL;
851 
852 	view->type = type;
853 	view->lines = LINES;
854 	view->cols = COLS;
855 	view->nlines = nlines ? nlines : LINES - begin_y;
856 	view->ncols = ncols ? ncols : COLS - begin_x;
857 	view->begin_y = begin_y;
858 	view->begin_x = begin_x;
859 	view->window = newwin(nlines, ncols, begin_y, begin_x);
860 	if (view->window == NULL) {
861 		view_close(view);
862 		return NULL;
863 	}
864 	view->panel = new_panel(view->window);
865 	if (view->panel == NULL ||
866 	    set_panel_userptr(view->panel, view) != OK) {
867 		view_close(view);
868 		return NULL;
869 	}
870 
871 	keypad(view->window, TRUE);
872 	return view;
873 }
874 
875 static int
876 view_split_begin_x(int begin_x)
877 {
878 	if (begin_x > 0 || COLS < 120)
879 		return 0;
880 	return (COLS - MAX(COLS / 2, 80));
881 }
882 
883 /* XXX Stub till we decide what to do. */
884 static int
885 view_split_begin_y(int lines)
886 {
887 	return lines * HSPLIT_SCALE;
888 }
889 
890 static const struct got_error *view_resize(struct tog_view *);
891 
892 static const struct got_error *
893 view_splitscreen(struct tog_view *view)
894 {
895 	const struct got_error *err = NULL;
896 
897 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
898 		if (view->resized_y && view->resized_y < view->lines)
899 			view->begin_y = view->resized_y;
900 		else
901 			view->begin_y = view_split_begin_y(view->nlines);
902 		view->begin_x = 0;
903 	} else if (!view->resized) {
904 		if (view->resized_x && view->resized_x < view->cols - 1 &&
905 		    view->cols > 119)
906 			view->begin_x = view->resized_x;
907 		else
908 			view->begin_x = view_split_begin_x(0);
909 		view->begin_y = 0;
910 	}
911 	view->nlines = LINES - view->begin_y;
912 	view->ncols = COLS - view->begin_x;
913 	view->lines = LINES;
914 	view->cols = COLS;
915 	err = view_resize(view);
916 	if (err)
917 		return err;
918 
919 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
920 		view->parent->nlines = view->begin_y;
921 
922 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
923 		return got_error_from_errno("mvwin");
924 
925 	return NULL;
926 }
927 
928 static const struct got_error *
929 view_fullscreen(struct tog_view *view)
930 {
931 	const struct got_error *err = NULL;
932 
933 	view->begin_x = 0;
934 	view->begin_y = view->resized ? view->begin_y : 0;
935 	view->nlines = view->resized ? view->nlines : LINES;
936 	view->ncols = COLS;
937 	view->lines = LINES;
938 	view->cols = COLS;
939 	err = view_resize(view);
940 	if (err)
941 		return err;
942 
943 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
944 		return got_error_from_errno("mvwin");
945 
946 	return NULL;
947 }
948 
949 static int
950 view_is_parent_view(struct tog_view *view)
951 {
952 	return view->parent == NULL;
953 }
954 
955 static int
956 view_is_splitscreen(struct tog_view *view)
957 {
958 	return view->begin_x > 0 || view->begin_y > 0;
959 }
960 
961 static int
962 view_is_fullscreen(struct tog_view *view)
963 {
964 	return view->nlines == LINES && view->ncols == COLS;
965 }
966 
967 static int
968 view_is_hsplit_top(struct tog_view *view)
969 {
970 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
971 	    view_is_splitscreen(view->child);
972 }
973 
974 static void
975 view_border(struct tog_view *view)
976 {
977 	PANEL *panel;
978 	const struct tog_view *view_above;
979 
980 	if (view->parent)
981 		return view_border(view->parent);
982 
983 	panel = panel_above(view->panel);
984 	if (panel == NULL)
985 		return;
986 
987 	view_above = panel_userptr(panel);
988 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
989 		mvwhline(view->window, view_above->begin_y - 1,
990 		    view->begin_x, ACS_HLINE, view->ncols);
991 	else
992 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
993 		    ACS_VLINE, view->nlines);
994 }
995 
996 static const struct got_error *view_init_hsplit(struct tog_view *, int);
997 static const struct got_error *request_log_commits(struct tog_view *);
998 static const struct got_error *offset_selection_down(struct tog_view *);
999 static void offset_selection_up(struct tog_view *);
1000 static void view_get_split(struct tog_view *, int *, int *);
1001 
1002 static const struct got_error *
1003 view_resize(struct tog_view *view)
1004 {
1005 	const struct got_error	*err = NULL;
1006 	int			 dif, nlines, ncols;
1007 
1008 	dif = LINES - view->lines;  /* line difference */
1009 
1010 	if (view->lines > LINES)
1011 		nlines = view->nlines - (view->lines - LINES);
1012 	else
1013 		nlines = view->nlines + (LINES - view->lines);
1014 	if (view->cols > COLS)
1015 		ncols = view->ncols - (view->cols - COLS);
1016 	else
1017 		ncols = view->ncols + (COLS - view->cols);
1018 
1019 	if (view->child) {
1020 		int hs = view->child->begin_y;
1021 
1022 		if (!view_is_fullscreen(view))
1023 			view->child->begin_x = view_split_begin_x(view->begin_x);
1024 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1025 		    view->child->begin_x == 0) {
1026 			ncols = COLS;
1027 
1028 			view_fullscreen(view->child);
1029 			if (view->child->focussed)
1030 				show_panel(view->child->panel);
1031 			else
1032 				show_panel(view->panel);
1033 		} else {
1034 			ncols = view->child->begin_x;
1035 
1036 			view_splitscreen(view->child);
1037 			show_panel(view->child->panel);
1038 		}
1039 		/*
1040 		 * XXX This is ugly and needs to be moved into the above
1041 		 * logic but "works" for now and my attempts at moving it
1042 		 * break either 'tab' or 'F' key maps in horizontal splits.
1043 		 */
1044 		if (hs) {
1045 			err = view_splitscreen(view->child);
1046 			if (err)
1047 				return err;
1048 			if (dif < 0) { /* top split decreased */
1049 				err = offset_selection_down(view);
1050 				if (err)
1051 					return err;
1052 			}
1053 			view_border(view);
1054 			update_panels();
1055 			doupdate();
1056 			show_panel(view->child->panel);
1057 			nlines = view->nlines;
1058 		}
1059 	} else if (view->parent == NULL)
1060 		ncols = COLS;
1061 
1062 	if (view->resize && dif > 0) {
1063 		err = view->resize(view, dif);
1064 		if (err)
1065 			return err;
1066 	}
1067 
1068 	if (wresize(view->window, nlines, ncols) == ERR)
1069 		return got_error_from_errno("wresize");
1070 	if (replace_panel(view->panel, view->window) == ERR)
1071 		return got_error_from_errno("replace_panel");
1072 	wclear(view->window);
1073 
1074 	view->nlines = nlines;
1075 	view->ncols = ncols;
1076 	view->lines = LINES;
1077 	view->cols = COLS;
1078 
1079 	return NULL;
1080 }
1081 
1082 static const struct got_error *
1083 resize_log_view(struct tog_view *view, int increase)
1084 {
1085 	struct tog_log_view_state	*s = &view->state.log;
1086 	const struct got_error		*err = NULL;
1087 	int				 n = 0;
1088 
1089 	if (s->selected_entry)
1090 		n = s->selected_entry->idx + view->lines - s->selected;
1091 
1092 	/*
1093 	 * Request commits to account for the increased
1094 	 * height so we have enough to populate the view.
1095 	 */
1096 	if (s->commits->ncommits < n) {
1097 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1098 		err = request_log_commits(view);
1099 	}
1100 
1101 	return err;
1102 }
1103 
1104 static void
1105 view_adjust_offset(struct tog_view *view, int n)
1106 {
1107 	if (n == 0)
1108 		return;
1109 
1110 	if (view->parent && view->parent->offset) {
1111 		if (view->parent->offset + n >= 0)
1112 			view->parent->offset += n;
1113 		else
1114 			view->parent->offset = 0;
1115 	} else if (view->offset) {
1116 		if (view->offset - n >= 0)
1117 			view->offset -= n;
1118 		else
1119 			view->offset = 0;
1120 	}
1121 }
1122 
1123 static const struct got_error *
1124 view_resize_split(struct tog_view *view, int resize)
1125 {
1126 	const struct got_error	*err = NULL;
1127 	struct tog_view		*v = NULL;
1128 
1129 	if (view->parent)
1130 		v = view->parent;
1131 	else
1132 		v = view;
1133 
1134 	if (!v->child || !view_is_splitscreen(v->child))
1135 		return NULL;
1136 
1137 	v->resized = v->child->resized = resize;  /* lock for resize event */
1138 
1139 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1140 		if (v->child->resized_y)
1141 			v->child->begin_y = v->child->resized_y;
1142 		if (view->parent)
1143 			v->child->begin_y -= resize;
1144 		else
1145 			v->child->begin_y += resize;
1146 		if (v->child->begin_y < 3) {
1147 			view->count = 0;
1148 			v->child->begin_y = 3;
1149 		} else if (v->child->begin_y > LINES - 1) {
1150 			view->count = 0;
1151 			v->child->begin_y = LINES - 1;
1152 		}
1153 		v->ncols = COLS;
1154 		v->child->ncols = COLS;
1155 		view_adjust_offset(view, resize);
1156 		err = view_init_hsplit(v, v->child->begin_y);
1157 		if (err)
1158 			return err;
1159 		v->child->resized_y = v->child->begin_y;
1160 	} else {
1161 		if (v->child->resized_x)
1162 			v->child->begin_x = v->child->resized_x;
1163 		if (view->parent)
1164 			v->child->begin_x -= resize;
1165 		else
1166 			v->child->begin_x += resize;
1167 		if (v->child->begin_x < 11) {
1168 			view->count = 0;
1169 			v->child->begin_x = 11;
1170 		} else if (v->child->begin_x > COLS - 1) {
1171 			view->count = 0;
1172 			v->child->begin_x = COLS - 1;
1173 		}
1174 		v->child->resized_x = v->child->begin_x;
1175 	}
1176 
1177 	v->child->mode = v->mode;
1178 	v->child->nlines = v->lines - v->child->begin_y;
1179 	v->child->ncols = v->cols - v->child->begin_x;
1180 	v->focus_child = 1;
1181 
1182 	err = view_fullscreen(v);
1183 	if (err)
1184 		return err;
1185 	err = view_splitscreen(v->child);
1186 	if (err)
1187 		return err;
1188 
1189 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1190 		err = offset_selection_down(v->child);
1191 		if (err)
1192 			return err;
1193 	}
1194 
1195 	if (v->resize)
1196 		err = v->resize(v, 0);
1197 	else if (v->child->resize)
1198 		err = v->child->resize(v->child, 0);
1199 
1200 	v->resized = v->child->resized = 0;
1201 
1202 	return err;
1203 }
1204 
1205 static void
1206 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1207 {
1208 	struct tog_view *v = src->child ? src->child : src;
1209 
1210 	dst->resized_x = v->resized_x;
1211 	dst->resized_y = v->resized_y;
1212 }
1213 
1214 static const struct got_error *
1215 view_close_child(struct tog_view *view)
1216 {
1217 	const struct got_error *err = NULL;
1218 
1219 	if (view->child == NULL)
1220 		return NULL;
1221 
1222 	err = view_close(view->child);
1223 	view->child = NULL;
1224 	return err;
1225 }
1226 
1227 static const struct got_error *
1228 view_set_child(struct tog_view *view, struct tog_view *child)
1229 {
1230 	const struct got_error *err = NULL;
1231 
1232 	view->child = child;
1233 	child->parent = view;
1234 
1235 	err = view_resize(view);
1236 	if (err)
1237 		return err;
1238 
1239 	if (view->child->resized_x || view->child->resized_y)
1240 		err = view_resize_split(view, 0);
1241 
1242 	return err;
1243 }
1244 
1245 static const struct got_error *view_dispatch_request(struct tog_view **,
1246     struct tog_view *, enum tog_view_type, int, int);
1247 
1248 static const struct got_error *
1249 view_request_new(struct tog_view **requested, struct tog_view *view,
1250     enum tog_view_type request)
1251 {
1252 	struct tog_view		*new_view = NULL;
1253 	const struct got_error	*err;
1254 	int			 y = 0, x = 0;
1255 
1256 	*requested = NULL;
1257 
1258 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1259 		view_get_split(view, &y, &x);
1260 
1261 	err = view_dispatch_request(&new_view, view, request, y, x);
1262 	if (err)
1263 		return err;
1264 
1265 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1266 	    request != TOG_VIEW_HELP) {
1267 		err = view_init_hsplit(view, y);
1268 		if (err)
1269 			return err;
1270 	}
1271 
1272 	view->focussed = 0;
1273 	new_view->focussed = 1;
1274 	new_view->mode = view->mode;
1275 	new_view->nlines = request == TOG_VIEW_HELP ?
1276 	    view->lines : view->lines - y;
1277 
1278 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1279 		view_transfer_size(new_view, view);
1280 		err = view_close_child(view);
1281 		if (err)
1282 			return err;
1283 		err = view_set_child(view, new_view);
1284 		if (err)
1285 			return err;
1286 		view->focus_child = 1;
1287 	} else
1288 		*requested = new_view;
1289 
1290 	return NULL;
1291 }
1292 
1293 static void
1294 tog_resizeterm(void)
1295 {
1296 	int cols, lines;
1297 	struct winsize size;
1298 
1299 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1300 		cols = 80;     /* Default */
1301 		lines = 24;
1302 	} else {
1303 		cols = size.ws_col;
1304 		lines = size.ws_row;
1305 	}
1306 	resize_term(lines, cols);
1307 }
1308 
1309 static const struct got_error *
1310 view_search_start(struct tog_view *view, int fast_refresh)
1311 {
1312 	const struct got_error *err = NULL;
1313 	struct tog_view *v = view;
1314 	char pattern[1024];
1315 	int ret;
1316 
1317 	if (view->search_started) {
1318 		regfree(&view->regex);
1319 		view->searching = 0;
1320 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1321 	}
1322 	view->search_started = 0;
1323 
1324 	if (view->nlines < 1)
1325 		return NULL;
1326 
1327 	if (view_is_hsplit_top(view))
1328 		v = view->child;
1329 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1330 		v = view->parent;
1331 
1332 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1333 	wclrtoeol(v->window);
1334 
1335 	nodelay(v->window, FALSE);  /* block for search term input */
1336 	nocbreak();
1337 	echo();
1338 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1339 	wrefresh(v->window);
1340 	cbreak();
1341 	noecho();
1342 	nodelay(v->window, TRUE);
1343 	if (!fast_refresh && !using_mock_io)
1344 		halfdelay(10);
1345 	if (ret == ERR)
1346 		return NULL;
1347 
1348 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1349 		err = view->search_start(view);
1350 		if (err) {
1351 			regfree(&view->regex);
1352 			return err;
1353 		}
1354 		view->search_started = 1;
1355 		view->searching = TOG_SEARCH_FORWARD;
1356 		view->search_next_done = 0;
1357 		view->search_next(view);
1358 	}
1359 
1360 	return NULL;
1361 }
1362 
1363 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1364 static const struct got_error *
1365 switch_split(struct tog_view *view)
1366 {
1367 	const struct got_error	*err = NULL;
1368 	struct tog_view		*v = NULL;
1369 
1370 	if (view->parent)
1371 		v = view->parent;
1372 	else
1373 		v = view;
1374 
1375 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1376 		v->mode = TOG_VIEW_SPLIT_VERT;
1377 	else
1378 		v->mode = TOG_VIEW_SPLIT_HRZN;
1379 
1380 	if (!v->child)
1381 		return NULL;
1382 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1383 		v->mode = TOG_VIEW_SPLIT_NONE;
1384 
1385 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1386 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1387 		v->child->begin_y = v->child->resized_y;
1388 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1389 		v->child->begin_x = v->child->resized_x;
1390 
1391 
1392 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1393 		v->ncols = COLS;
1394 		v->child->ncols = COLS;
1395 		v->child->nscrolled = LINES - v->child->nlines;
1396 
1397 		err = view_init_hsplit(v, v->child->begin_y);
1398 		if (err)
1399 			return err;
1400 	}
1401 	v->child->mode = v->mode;
1402 	v->child->nlines = v->lines - v->child->begin_y;
1403 	v->focus_child = 1;
1404 
1405 	err = view_fullscreen(v);
1406 	if (err)
1407 		return err;
1408 	err = view_splitscreen(v->child);
1409 	if (err)
1410 		return err;
1411 
1412 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1413 		v->mode = TOG_VIEW_SPLIT_VERT;
1414 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1415 		err = offset_selection_down(v);
1416 		if (err)
1417 			return err;
1418 		err = offset_selection_down(v->child);
1419 		if (err)
1420 			return err;
1421 	} else {
1422 		offset_selection_up(v);
1423 		offset_selection_up(v->child);
1424 	}
1425 	if (v->resize)
1426 		err = v->resize(v, 0);
1427 	else if (v->child->resize)
1428 		err = v->child->resize(v->child, 0);
1429 
1430 	return err;
1431 }
1432 
1433 /*
1434  * Strip trailing whitespace from str starting at byte *n;
1435  * if *n < 0, use strlen(str). Return new str length in *n.
1436  */
1437 static void
1438 strip_trailing_ws(char *str, int *n)
1439 {
1440 	size_t x = *n;
1441 
1442 	if (str == NULL || *str == '\0')
1443 		return;
1444 
1445 	if (x < 0)
1446 		x = strlen(str);
1447 
1448 	while (x-- > 0 && isspace((unsigned char)str[x]))
1449 		str[x] = '\0';
1450 
1451 	*n = x + 1;
1452 }
1453 
1454 /*
1455  * Extract visible substring of line y from the curses screen
1456  * and strip trailing whitespace. If vline is set, overwrite
1457  * line[vline] with '|' because the ACS_VLINE character is
1458  * written out as 'x'. Write the line to file f.
1459  */
1460 static const struct got_error *
1461 view_write_line(FILE *f, int y, int vline)
1462 {
1463 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1464 	int	r, w;
1465 
1466 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1467 	if (r == ERR)
1468 		return got_error_fmt(GOT_ERR_RANGE,
1469 		    "failed to extract line %d", y);
1470 
1471 	/*
1472 	 * In some views, lines are padded with blanks to COLS width.
1473 	 * Strip them so we can diff without the -b flag when testing.
1474 	 */
1475 	strip_trailing_ws(line, &r);
1476 
1477 	if (vline > 0)
1478 		line[vline] = '|';
1479 
1480 	w = fprintf(f, "%s\n", line);
1481 	if (w != r + 1)		/* \n */
1482 		return got_ferror(f, GOT_ERR_IO);
1483 
1484 	return NULL;
1485 }
1486 
1487 /*
1488  * Capture the visible curses screen by writing each line to the
1489  * file at the path set via the TOG_SCR_DUMP environment variable.
1490  */
1491 static const struct got_error *
1492 screendump(struct tog_view *view)
1493 {
1494 	const struct got_error	*err;
1495 	int			 i;
1496 
1497 	err = got_opentemp_truncate(tog_io.sdump);
1498 	if (err)
1499 		return err;
1500 
1501 	if ((view->child && view->child->begin_x) ||
1502 	    (view->parent && view->begin_x)) {
1503 		int ncols = view->child ? view->ncols : view->parent->ncols;
1504 
1505 		/* vertical splitscreen */
1506 		for (i = 0; i < view->nlines; ++i) {
1507 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1508 			if (err)
1509 				goto done;
1510 		}
1511 	} else {
1512 		int hline = 0;
1513 
1514 		/* fullscreen or horizontal splitscreen */
1515 		if ((view->child && view->child->begin_y) ||
1516 		    (view->parent && view->begin_y))	/* hsplit */
1517 			hline = view->child ?
1518 			    view->child->begin_y : view->begin_y;
1519 
1520 		for (i = 0; i < view->lines; i++) {
1521 			if (hline && i == hline - 1) {
1522 				int c;
1523 
1524 				/* ACS_HLINE writes out as 'q', overwrite it */
1525 				for (c = 0; c < view->cols; ++c)
1526 					fputc('-', tog_io.sdump);
1527 				fputc('\n', tog_io.sdump);
1528 				continue;
1529 			}
1530 
1531 			err = view_write_line(tog_io.sdump, i, 0);
1532 			if (err)
1533 				goto done;
1534 		}
1535 	}
1536 
1537 done:
1538 	return err;
1539 }
1540 
1541 /*
1542  * Compute view->count from numeric input. Assign total to view->count and
1543  * return first non-numeric key entered.
1544  */
1545 static int
1546 get_compound_key(struct tog_view *view, int c)
1547 {
1548 	struct tog_view	*v = view;
1549 	int		 x, n = 0;
1550 
1551 	if (view_is_hsplit_top(view))
1552 		v = view->child;
1553 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1554 		v = view->parent;
1555 
1556 	view->count = 0;
1557 	cbreak();  /* block for input */
1558 	nodelay(view->window, FALSE);
1559 	wmove(v->window, v->nlines - 1, 0);
1560 	wclrtoeol(v->window);
1561 	waddch(v->window, ':');
1562 
1563 	do {
1564 		x = getcurx(v->window);
1565 		if (x != ERR && x < view->ncols) {
1566 			waddch(v->window, c);
1567 			wrefresh(v->window);
1568 		}
1569 
1570 		/*
1571 		 * Don't overflow. Max valid request should be the greatest
1572 		 * between the longest and total lines; cap at 10 million.
1573 		 */
1574 		if (n >= 9999999)
1575 			n = 9999999;
1576 		else
1577 			n = n * 10 + (c - '0');
1578 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1579 
1580 	if (c == 'G' || c == 'g') {	/* nG key map */
1581 		view->gline = view->hiline = n;
1582 		n = 0;
1583 		c = 0;
1584 	}
1585 
1586 	/* Massage excessive or inapplicable values at the input handler. */
1587 	view->count = n;
1588 
1589 	return c;
1590 }
1591 
1592 static void
1593 action_report(struct tog_view *view)
1594 {
1595 	struct tog_view *v = view;
1596 
1597 	if (view_is_hsplit_top(view))
1598 		v = view->child;
1599 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1600 		v = view->parent;
1601 
1602 	wmove(v->window, v->nlines - 1, 0);
1603 	wclrtoeol(v->window);
1604 	wprintw(v->window, ":%s", view->action);
1605 	wrefresh(v->window);
1606 
1607 	/*
1608 	 * Clear action status report. Only clear in blame view
1609 	 * once annotating is complete, otherwise it's too fast.
1610 	 */
1611 	if (view->type == TOG_VIEW_BLAME) {
1612 		if (view->state.blame.blame_complete)
1613 			view->action = NULL;
1614 	} else
1615 		view->action = NULL;
1616 }
1617 
1618 /*
1619  * Read the next line from the test script and assign
1620  * key instruction to *ch. If at EOF, set the *done flag.
1621  */
1622 static const struct got_error *
1623 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1624 {
1625 	const struct got_error	*err = NULL;
1626 	char			*line = NULL;
1627 	size_t			 linesz = 0;
1628 
1629 	if (view->count && --view->count) {
1630 		*ch = view->ch;
1631 		return NULL;
1632 	} else
1633 		*ch = -1;
1634 
1635 	if (getline(&line, &linesz, script) == -1) {
1636 		if (feof(script)) {
1637 			*done = 1;
1638 			goto done;
1639 		} else {
1640 			err = got_ferror(script, GOT_ERR_IO);
1641 			goto done;
1642 		}
1643 	}
1644 
1645 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1646 		tog_io.wait_for_ui = 1;
1647 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1648 		*ch = KEY_ENTER;
1649 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1650 		*ch = KEY_RIGHT;
1651 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1652 		*ch = KEY_LEFT;
1653 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1654 		*ch = KEY_DOWN;
1655 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1656 		*ch = KEY_UP;
1657 	else if (strncasecmp(line, "TAB", 3) == 0)
1658 		*ch = '\t';
1659 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1660 		*ch = TOG_KEY_SCRDUMP;
1661 	else if (isdigit((unsigned char)*line)) {
1662 		char *t = line;
1663 
1664 		while (isdigit((unsigned char)*t))
1665 			++t;
1666 		view->ch = *ch = *t;
1667 		*t = '\0';
1668 		/* ignore error, view->count is 0 if instruction is invalid */
1669 		view->count = strtonum(line, 0, INT_MAX, NULL);
1670 	} else
1671 		*ch = *line;
1672 
1673 done:
1674 	free(line);
1675 	return err;
1676 }
1677 
1678 static const struct got_error *
1679 view_input(struct tog_view **new, int *done, struct tog_view *view,
1680     struct tog_view_list_head *views, int fast_refresh)
1681 {
1682 	const struct got_error *err = NULL;
1683 	struct tog_view *v;
1684 	int ch, errcode;
1685 
1686 	*new = NULL;
1687 
1688 	if (view->action)
1689 		action_report(view);
1690 
1691 	/* Clear "no matches" indicator. */
1692 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1693 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1694 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1695 		view->count = 0;
1696 	}
1697 
1698 	if (view->searching && !view->search_next_done) {
1699 		errcode = pthread_mutex_unlock(&tog_mutex);
1700 		if (errcode)
1701 			return got_error_set_errno(errcode,
1702 			    "pthread_mutex_unlock");
1703 		sched_yield();
1704 		errcode = pthread_mutex_lock(&tog_mutex);
1705 		if (errcode)
1706 			return got_error_set_errno(errcode,
1707 			    "pthread_mutex_lock");
1708 		view->search_next(view);
1709 		return NULL;
1710 	}
1711 
1712 	/* Allow threads to make progress while we are waiting for input. */
1713 	errcode = pthread_mutex_unlock(&tog_mutex);
1714 	if (errcode)
1715 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1716 
1717 	if (using_mock_io) {
1718 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1719 		if (err) {
1720 			errcode = pthread_mutex_lock(&tog_mutex);
1721 			return err;
1722 		}
1723 	} else if (view->count && --view->count) {
1724 		cbreak();
1725 		nodelay(view->window, TRUE);
1726 		ch = wgetch(view->window);
1727 		/* let C-g or backspace abort unfinished count */
1728 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1729 			view->count = 0;
1730 		else
1731 			ch = view->ch;
1732 	} else {
1733 		ch = wgetch(view->window);
1734 		if (ch >= '1' && ch  <= '9')
1735 			view->ch = ch = get_compound_key(view, ch);
1736 	}
1737 	if (view->hiline && ch != ERR && ch != 0)
1738 		view->hiline = 0;  /* key pressed, clear line highlight */
1739 	nodelay(view->window, TRUE);
1740 	errcode = pthread_mutex_lock(&tog_mutex);
1741 	if (errcode)
1742 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1743 
1744 	if (tog_sigwinch_received || tog_sigcont_received) {
1745 		tog_resizeterm();
1746 		tog_sigwinch_received = 0;
1747 		tog_sigcont_received = 0;
1748 		TAILQ_FOREACH(v, views, entry) {
1749 			err = view_resize(v);
1750 			if (err)
1751 				return err;
1752 			err = v->input(new, v, KEY_RESIZE);
1753 			if (err)
1754 				return err;
1755 			if (v->child) {
1756 				err = view_resize(v->child);
1757 				if (err)
1758 					return err;
1759 				err = v->child->input(new, v->child,
1760 				    KEY_RESIZE);
1761 				if (err)
1762 					return err;
1763 				if (v->child->resized_x || v->child->resized_y) {
1764 					err = view_resize_split(v, 0);
1765 					if (err)
1766 						return err;
1767 				}
1768 			}
1769 		}
1770 	}
1771 
1772 	switch (ch) {
1773 	case '?':
1774 	case 'H':
1775 	case KEY_F(1):
1776 		if (view->type == TOG_VIEW_HELP)
1777 			err = view->reset(view);
1778 		else
1779 			err = view_request_new(new, view, TOG_VIEW_HELP);
1780 		break;
1781 	case '\t':
1782 		view->count = 0;
1783 		if (view->child) {
1784 			view->focussed = 0;
1785 			view->child->focussed = 1;
1786 			view->focus_child = 1;
1787 		} else if (view->parent) {
1788 			view->focussed = 0;
1789 			view->parent->focussed = 1;
1790 			view->parent->focus_child = 0;
1791 			if (!view_is_splitscreen(view)) {
1792 				if (view->parent->resize) {
1793 					err = view->parent->resize(view->parent,
1794 					    0);
1795 					if (err)
1796 						return err;
1797 				}
1798 				offset_selection_up(view->parent);
1799 				err = view_fullscreen(view->parent);
1800 				if (err)
1801 					return err;
1802 			}
1803 		}
1804 		break;
1805 	case 'q':
1806 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1807 			if (view->parent->resize) {
1808 				/* might need more commits to fill fullscreen */
1809 				err = view->parent->resize(view->parent, 0);
1810 				if (err)
1811 					break;
1812 			}
1813 			offset_selection_up(view->parent);
1814 		}
1815 		err = view->input(new, view, ch);
1816 		view->dying = 1;
1817 		break;
1818 	case 'Q':
1819 		*done = 1;
1820 		break;
1821 	case 'F':
1822 		view->count = 0;
1823 		if (view_is_parent_view(view)) {
1824 			if (view->child == NULL)
1825 				break;
1826 			if (view_is_splitscreen(view->child)) {
1827 				view->focussed = 0;
1828 				view->child->focussed = 1;
1829 				err = view_fullscreen(view->child);
1830 			} else {
1831 				err = view_splitscreen(view->child);
1832 				if (!err)
1833 					err = view_resize_split(view, 0);
1834 			}
1835 			if (err)
1836 				break;
1837 			err = view->child->input(new, view->child,
1838 			    KEY_RESIZE);
1839 		} else {
1840 			if (view_is_splitscreen(view)) {
1841 				view->parent->focussed = 0;
1842 				view->focussed = 1;
1843 				err = view_fullscreen(view);
1844 			} else {
1845 				err = view_splitscreen(view);
1846 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1847 					err = view_resize(view->parent);
1848 				if (!err)
1849 					err = view_resize_split(view, 0);
1850 			}
1851 			if (err)
1852 				break;
1853 			err = view->input(new, view, KEY_RESIZE);
1854 		}
1855 		if (err)
1856 			break;
1857 		if (view->resize) {
1858 			err = view->resize(view, 0);
1859 			if (err)
1860 				break;
1861 		}
1862 		if (view->parent) {
1863 			if (view->parent->resize) {
1864 				err = view->parent->resize(view->parent, 0);
1865 				if (err != NULL)
1866 					break;
1867 			}
1868 			err = offset_selection_down(view->parent);
1869 			if (err != NULL)
1870 				break;
1871 		}
1872 		err = offset_selection_down(view);
1873 		break;
1874 	case 'S':
1875 		view->count = 0;
1876 		err = switch_split(view);
1877 		break;
1878 	case '-':
1879 		err = view_resize_split(view, -1);
1880 		break;
1881 	case '+':
1882 		err = view_resize_split(view, 1);
1883 		break;
1884 	case KEY_RESIZE:
1885 		break;
1886 	case '/':
1887 		view->count = 0;
1888 		if (view->search_start)
1889 			view_search_start(view, fast_refresh);
1890 		else
1891 			err = view->input(new, view, ch);
1892 		break;
1893 	case 'N':
1894 	case 'n':
1895 		if (view->search_started && view->search_next) {
1896 			view->searching = (ch == 'n' ?
1897 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1898 			view->search_next_done = 0;
1899 			view->search_next(view);
1900 		} else
1901 			err = view->input(new, view, ch);
1902 		break;
1903 	case 'A':
1904 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1905 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1906 			view->action = "Patience diff algorithm";
1907 		} else {
1908 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1909 			view->action = "Myers diff algorithm";
1910 		}
1911 		TAILQ_FOREACH(v, views, entry) {
1912 			if (v->reset) {
1913 				err = v->reset(v);
1914 				if (err)
1915 					return err;
1916 			}
1917 			if (v->child && v->child->reset) {
1918 				err = v->child->reset(v->child);
1919 				if (err)
1920 					return err;
1921 			}
1922 		}
1923 		break;
1924 	case TOG_KEY_SCRDUMP:
1925 		err = screendump(view);
1926 		break;
1927 	default:
1928 		err = view->input(new, view, ch);
1929 		break;
1930 	}
1931 
1932 	return err;
1933 }
1934 
1935 static int
1936 view_needs_focus_indication(struct tog_view *view)
1937 {
1938 	if (view_is_parent_view(view)) {
1939 		if (view->child == NULL || view->child->focussed)
1940 			return 0;
1941 		if (!view_is_splitscreen(view->child))
1942 			return 0;
1943 	} else if (!view_is_splitscreen(view))
1944 		return 0;
1945 
1946 	return view->focussed;
1947 }
1948 
1949 static const struct got_error *
1950 tog_io_close(void)
1951 {
1952 	const struct got_error *err = NULL;
1953 
1954 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1955 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1956 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1957 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1958 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1959 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1960 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1961 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1962 
1963 	return err;
1964 }
1965 
1966 static const struct got_error *
1967 view_loop(struct tog_view *view)
1968 {
1969 	const struct got_error *err = NULL;
1970 	struct tog_view_list_head views;
1971 	struct tog_view *new_view;
1972 	char *mode;
1973 	int fast_refresh = 10;
1974 	int done = 0, errcode;
1975 
1976 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1977 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1978 		view->mode = TOG_VIEW_SPLIT_VERT;
1979 	else
1980 		view->mode = TOG_VIEW_SPLIT_HRZN;
1981 
1982 	errcode = pthread_mutex_lock(&tog_mutex);
1983 	if (errcode)
1984 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1985 
1986 	TAILQ_INIT(&views);
1987 	TAILQ_INSERT_HEAD(&views, view, entry);
1988 
1989 	view->focussed = 1;
1990 	err = view->show(view);
1991 	if (err)
1992 		return err;
1993 	update_panels();
1994 	doupdate();
1995 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1996 	    !tog_fatal_signal_received()) {
1997 		/* Refresh fast during initialization, then become slower. */
1998 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1999 			halfdelay(10); /* switch to once per second */
2000 
2001 		err = view_input(&new_view, &done, view, &views, fast_refresh);
2002 		if (err)
2003 			break;
2004 
2005 		if (view->dying && view == TAILQ_FIRST(&views) &&
2006 		    TAILQ_NEXT(view, entry) == NULL)
2007 			done = 1;
2008 		if (done) {
2009 			struct tog_view *v;
2010 
2011 			/*
2012 			 * When we quit, scroll the screen up a single line
2013 			 * so we don't lose any information.
2014 			 */
2015 			TAILQ_FOREACH(v, &views, entry) {
2016 				wmove(v->window, 0, 0);
2017 				wdeleteln(v->window);
2018 				wnoutrefresh(v->window);
2019 				if (v->child && !view_is_fullscreen(v)) {
2020 					wmove(v->child->window, 0, 0);
2021 					wdeleteln(v->child->window);
2022 					wnoutrefresh(v->child->window);
2023 				}
2024 			}
2025 			doupdate();
2026 		}
2027 
2028 		if (view->dying) {
2029 			struct tog_view *v, *prev = NULL;
2030 
2031 			if (view_is_parent_view(view))
2032 				prev = TAILQ_PREV(view, tog_view_list_head,
2033 				    entry);
2034 			else if (view->parent)
2035 				prev = view->parent;
2036 
2037 			if (view->parent) {
2038 				view->parent->child = NULL;
2039 				view->parent->focus_child = 0;
2040 				/* Restore fullscreen line height. */
2041 				view->parent->nlines = view->parent->lines;
2042 				err = view_resize(view->parent);
2043 				if (err)
2044 					break;
2045 				/* Make resized splits persist. */
2046 				view_transfer_size(view->parent, view);
2047 			} else
2048 				TAILQ_REMOVE(&views, view, entry);
2049 
2050 			err = view_close(view);
2051 			if (err)
2052 				goto done;
2053 
2054 			view = NULL;
2055 			TAILQ_FOREACH(v, &views, entry) {
2056 				if (v->focussed)
2057 					break;
2058 			}
2059 			if (view == NULL && new_view == NULL) {
2060 				/* No view has focus. Try to pick one. */
2061 				if (prev)
2062 					view = prev;
2063 				else if (!TAILQ_EMPTY(&views)) {
2064 					view = TAILQ_LAST(&views,
2065 					    tog_view_list_head);
2066 				}
2067 				if (view) {
2068 					if (view->focus_child) {
2069 						view->child->focussed = 1;
2070 						view = view->child;
2071 					} else
2072 						view->focussed = 1;
2073 				}
2074 			}
2075 		}
2076 		if (new_view) {
2077 			struct tog_view *v, *t;
2078 			/* Only allow one parent view per type. */
2079 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2080 				if (v->type != new_view->type)
2081 					continue;
2082 				TAILQ_REMOVE(&views, v, entry);
2083 				err = view_close(v);
2084 				if (err)
2085 					goto done;
2086 				break;
2087 			}
2088 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2089 			view = new_view;
2090 		}
2091 		if (view && !done) {
2092 			if (view_is_parent_view(view)) {
2093 				if (view->child && view->child->focussed)
2094 					view = view->child;
2095 			} else {
2096 				if (view->parent && view->parent->focussed)
2097 					view = view->parent;
2098 			}
2099 			show_panel(view->panel);
2100 			if (view->child && view_is_splitscreen(view->child))
2101 				show_panel(view->child->panel);
2102 			if (view->parent && view_is_splitscreen(view)) {
2103 				err = view->parent->show(view->parent);
2104 				if (err)
2105 					goto done;
2106 			}
2107 			err = view->show(view);
2108 			if (err)
2109 				goto done;
2110 			if (view->child) {
2111 				err = view->child->show(view->child);
2112 				if (err)
2113 					goto done;
2114 			}
2115 			update_panels();
2116 			doupdate();
2117 		}
2118 	}
2119 done:
2120 	while (!TAILQ_EMPTY(&views)) {
2121 		const struct got_error *close_err;
2122 		view = TAILQ_FIRST(&views);
2123 		TAILQ_REMOVE(&views, view, entry);
2124 		close_err = view_close(view);
2125 		if (close_err && err == NULL)
2126 			err = close_err;
2127 	}
2128 
2129 	errcode = pthread_mutex_unlock(&tog_mutex);
2130 	if (errcode && err == NULL)
2131 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2132 
2133 	return err;
2134 }
2135 
2136 __dead static void
2137 usage_log(void)
2138 {
2139 	endwin();
2140 	fprintf(stderr,
2141 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2142 	    getprogname());
2143 	exit(1);
2144 }
2145 
2146 /* Create newly allocated wide-character string equivalent to a byte string. */
2147 static const struct got_error *
2148 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2149 {
2150 	char *vis = NULL;
2151 	const struct got_error *err = NULL;
2152 
2153 	*ws = NULL;
2154 	*wlen = mbstowcs(NULL, s, 0);
2155 	if (*wlen == (size_t)-1) {
2156 		int vislen;
2157 		if (errno != EILSEQ)
2158 			return got_error_from_errno("mbstowcs");
2159 
2160 		/* byte string invalid in current encoding; try to "fix" it */
2161 		err = got_mbsavis(&vis, &vislen, s);
2162 		if (err)
2163 			return err;
2164 		*wlen = mbstowcs(NULL, vis, 0);
2165 		if (*wlen == (size_t)-1) {
2166 			err = got_error_from_errno("mbstowcs"); /* give up */
2167 			goto done;
2168 		}
2169 	}
2170 
2171 	*ws = calloc(*wlen + 1, sizeof(**ws));
2172 	if (*ws == NULL) {
2173 		err = got_error_from_errno("calloc");
2174 		goto done;
2175 	}
2176 
2177 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2178 		err = got_error_from_errno("mbstowcs");
2179 done:
2180 	free(vis);
2181 	if (err) {
2182 		free(*ws);
2183 		*ws = NULL;
2184 		*wlen = 0;
2185 	}
2186 	return err;
2187 }
2188 
2189 static const struct got_error *
2190 expand_tab(char **ptr, const char *src)
2191 {
2192 	char	*dst;
2193 	size_t	 len, n, idx = 0, sz = 0;
2194 
2195 	*ptr = NULL;
2196 	n = len = strlen(src);
2197 	dst = malloc(n + 1);
2198 	if (dst == NULL)
2199 		return got_error_from_errno("malloc");
2200 
2201 	while (idx < len && src[idx]) {
2202 		const char c = src[idx];
2203 
2204 		if (c == '\t') {
2205 			size_t nb = TABSIZE - sz % TABSIZE;
2206 			char *p;
2207 
2208 			p = realloc(dst, n + nb);
2209 			if (p == NULL) {
2210 				free(dst);
2211 				return got_error_from_errno("realloc");
2212 
2213 			}
2214 			dst = p;
2215 			n += nb;
2216 			memset(dst + sz, ' ', nb);
2217 			sz += nb;
2218 		} else
2219 			dst[sz++] = src[idx];
2220 		++idx;
2221 	}
2222 
2223 	dst[sz] = '\0';
2224 	*ptr = dst;
2225 	return NULL;
2226 }
2227 
2228 /*
2229  * Advance at most n columns from wline starting at offset off.
2230  * Return the index to the first character after the span operation.
2231  * Return the combined column width of all spanned wide characters in
2232  * *rcol.
2233  */
2234 static int
2235 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2236 {
2237 	int width, i, cols = 0;
2238 
2239 	if (n == 0) {
2240 		*rcol = cols;
2241 		return off;
2242 	}
2243 
2244 	for (i = off; wline[i] != L'\0'; ++i) {
2245 		if (wline[i] == L'\t')
2246 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2247 		else
2248 			width = wcwidth(wline[i]);
2249 
2250 		if (width == -1) {
2251 			width = 1;
2252 			wline[i] = L'.';
2253 		}
2254 
2255 		if (cols + width > n)
2256 			break;
2257 		cols += width;
2258 	}
2259 
2260 	*rcol = cols;
2261 	return i;
2262 }
2263 
2264 /*
2265  * Format a line for display, ensuring that it won't overflow a width limit.
2266  * With scrolling, the width returned refers to the scrolled version of the
2267  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2268  */
2269 static const struct got_error *
2270 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2271     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2272 {
2273 	const struct got_error *err = NULL;
2274 	int cols;
2275 	wchar_t *wline = NULL;
2276 	char *exstr = NULL;
2277 	size_t wlen;
2278 	int i, scrollx;
2279 
2280 	*wlinep = NULL;
2281 	*widthp = 0;
2282 
2283 	if (expand) {
2284 		err = expand_tab(&exstr, line);
2285 		if (err)
2286 			return err;
2287 	}
2288 
2289 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2290 	free(exstr);
2291 	if (err)
2292 		return err;
2293 
2294 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2295 
2296 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2297 		wline[wlen - 1] = L'\0';
2298 		wlen--;
2299 	}
2300 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2301 		wline[wlen - 1] = L'\0';
2302 		wlen--;
2303 	}
2304 
2305 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2306 	wline[i] = L'\0';
2307 
2308 	if (widthp)
2309 		*widthp = cols;
2310 	if (scrollxp)
2311 		*scrollxp = scrollx;
2312 	if (err)
2313 		free(wline);
2314 	else
2315 		*wlinep = wline;
2316 	return err;
2317 }
2318 
2319 static const struct got_error*
2320 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2321     struct got_object_id *id, struct got_repository *repo)
2322 {
2323 	static const struct got_error *err = NULL;
2324 	struct got_reflist_entry *re;
2325 	char *s;
2326 	const char *name;
2327 
2328 	*refs_str = NULL;
2329 
2330 	if (refs == NULL)
2331 		return NULL;
2332 
2333 	TAILQ_FOREACH(re, refs, entry) {
2334 		struct got_tag_object *tag = NULL;
2335 		struct got_object_id *ref_id;
2336 		int cmp;
2337 
2338 		name = got_ref_get_name(re->ref);
2339 		if (strcmp(name, GOT_REF_HEAD) == 0)
2340 			continue;
2341 		if (strncmp(name, "refs/", 5) == 0)
2342 			name += 5;
2343 		if (strncmp(name, "got/", 4) == 0)
2344 			continue;
2345 		if (strncmp(name, "heads/", 6) == 0)
2346 			name += 6;
2347 		if (strncmp(name, "remotes/", 8) == 0) {
2348 			name += 8;
2349 			s = strstr(name, "/" GOT_REF_HEAD);
2350 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2351 				continue;
2352 		}
2353 		err = got_ref_resolve(&ref_id, repo, re->ref);
2354 		if (err)
2355 			break;
2356 		if (strncmp(name, "tags/", 5) == 0) {
2357 			err = got_object_open_as_tag(&tag, repo, ref_id);
2358 			if (err) {
2359 				if (err->code != GOT_ERR_OBJ_TYPE) {
2360 					free(ref_id);
2361 					break;
2362 				}
2363 				/* Ref points at something other than a tag. */
2364 				err = NULL;
2365 				tag = NULL;
2366 			}
2367 		}
2368 		cmp = got_object_id_cmp(tag ?
2369 		    got_object_tag_get_object_id(tag) : ref_id, id);
2370 		free(ref_id);
2371 		if (tag)
2372 			got_object_tag_close(tag);
2373 		if (cmp != 0)
2374 			continue;
2375 		s = *refs_str;
2376 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2377 		    s ? ", " : "", name) == -1) {
2378 			err = got_error_from_errno("asprintf");
2379 			free(s);
2380 			*refs_str = NULL;
2381 			break;
2382 		}
2383 		free(s);
2384 	}
2385 
2386 	return err;
2387 }
2388 
2389 static const struct got_error *
2390 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2391     int col_tab_align)
2392 {
2393 	char *smallerthan;
2394 
2395 	smallerthan = strchr(author, '<');
2396 	if (smallerthan && smallerthan[1] != '\0')
2397 		author = smallerthan + 1;
2398 	author[strcspn(author, "@>")] = '\0';
2399 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2400 	    col_tab_align, 0);
2401 }
2402 
2403 static const struct got_error *
2404 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2405     struct got_object_id *id, const size_t date_display_cols,
2406     int author_display_cols)
2407 {
2408 	struct tog_log_view_state *s = &view->state.log;
2409 	const struct got_error *err = NULL;
2410 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2411 	char *refs_str = NULL;
2412 	char *logmsg0 = NULL, *logmsg = NULL;
2413 	char *author = NULL;
2414 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2415 	int author_width, refstr_width, logmsg_width;
2416 	char *newline, *line = NULL;
2417 	int col, limit, scrollx, logmsg_x;
2418 	const int avail = view->ncols;
2419 	struct tm tm;
2420 	time_t committer_time;
2421 	struct tog_color *tc;
2422 	struct got_reflist_head *refs;
2423 
2424 	committer_time = got_object_commit_get_committer_time(commit);
2425 	if (gmtime_r(&committer_time, &tm) == NULL)
2426 		return got_error_from_errno("gmtime_r");
2427 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2428 		return got_error(GOT_ERR_NO_SPACE);
2429 
2430 	if (avail <= date_display_cols)
2431 		limit = MIN(sizeof(datebuf) - 1, avail);
2432 	else
2433 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2434 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2435 	if (tc)
2436 		wattr_on(view->window,
2437 		    COLOR_PAIR(tc->colorpair), NULL);
2438 	waddnstr(view->window, datebuf, limit);
2439 	if (tc)
2440 		wattr_off(view->window,
2441 		    COLOR_PAIR(tc->colorpair), NULL);
2442 	col = limit;
2443 	if (col > avail)
2444 		goto done;
2445 
2446 	if (avail >= 120) {
2447 		char *id_str;
2448 		err = got_object_id_str(&id_str, id);
2449 		if (err)
2450 			goto done;
2451 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2452 		if (tc)
2453 			wattr_on(view->window,
2454 			    COLOR_PAIR(tc->colorpair), NULL);
2455 		wprintw(view->window, "%.8s ", id_str);
2456 		if (tc)
2457 			wattr_off(view->window,
2458 			    COLOR_PAIR(tc->colorpair), NULL);
2459 		free(id_str);
2460 		col += 9;
2461 		if (col > avail)
2462 			goto done;
2463 	}
2464 
2465 	if (s->use_committer)
2466 		author = strdup(got_object_commit_get_committer(commit));
2467 	else
2468 		author = strdup(got_object_commit_get_author(commit));
2469 	if (author == NULL) {
2470 		err = got_error_from_errno("strdup");
2471 		goto done;
2472 	}
2473 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2474 	if (err)
2475 		goto done;
2476 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2477 	if (tc)
2478 		wattr_on(view->window,
2479 		    COLOR_PAIR(tc->colorpair), NULL);
2480 	waddwstr(view->window, wauthor);
2481 	col += author_width;
2482 	while (col < avail && author_width < author_display_cols + 2) {
2483 		waddch(view->window, ' ');
2484 		col++;
2485 		author_width++;
2486 	}
2487 	if (tc)
2488 		wattr_off(view->window,
2489 		    COLOR_PAIR(tc->colorpair), NULL);
2490 	if (col > avail)
2491 		goto done;
2492 
2493 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2494 	if (err)
2495 		goto done;
2496 	logmsg = logmsg0;
2497 	while (*logmsg == '\n')
2498 		logmsg++;
2499 	newline = strchr(logmsg, '\n');
2500 	if (newline)
2501 		*newline = '\0';
2502 
2503 	limit = avail - col;
2504 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2505 		limit--;	/* for the border */
2506 
2507 	/* Prepend reference labels to log message if possible .*/
2508 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2509 	err = build_refs_str(&refs_str, refs, id, s->repo);
2510 	if (err)
2511 		goto done;
2512 	if (refs_str) {
2513 		char *rs;
2514 
2515 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2516 			err = got_error_from_errno("asprintf");
2517 			goto done;
2518 		}
2519 		err = format_line(&wrefstr, &refstr_width,
2520 		    &scrollx, rs, view->x, limit, col, 1);
2521 		free(rs);
2522 		if (err)
2523 			goto done;
2524 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2525 		if (tc)
2526 			wattr_on(view->window,
2527 			    COLOR_PAIR(tc->colorpair), NULL);
2528 		waddwstr(view->window, &wrefstr[scrollx]);
2529 		if (tc)
2530 			wattr_off(view->window,
2531 			    COLOR_PAIR(tc->colorpair), NULL);
2532 		col += MAX(refstr_width, 0);
2533 		if (col > avail)
2534 			goto done;
2535 
2536 		if (col < avail) {
2537 			waddch(view->window, ' ');
2538 			col++;
2539 		}
2540 
2541 		if (refstr_width > 0)
2542 			logmsg_x = 0;
2543 		else {
2544 			int unscrolled_refstr_width;
2545 			size_t len = wcslen(wrefstr);
2546 
2547 			/*
2548 			 * No need to check for -1 return value here since
2549 			 * unprintables have been replaced by span_wline().
2550 			 */
2551 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2552 			unscrolled_refstr_width += 1; /* trailing space */
2553 			logmsg_x = view->x - unscrolled_refstr_width;
2554 		}
2555 
2556 		limit = avail - col;
2557 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2558 			limit--;	/* for the border */
2559 	} else
2560 		logmsg_x = view->x;
2561 
2562 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2563 	    limit, col, 1);
2564 	if (err)
2565 		goto done;
2566 	waddwstr(view->window, &wlogmsg[scrollx]);
2567 	col += MAX(logmsg_width, 0);
2568 	while (col < avail) {
2569 		waddch(view->window, ' ');
2570 		col++;
2571 	}
2572 done:
2573 	free(logmsg0);
2574 	free(wlogmsg);
2575 	free(wrefstr);
2576 	free(refs_str);
2577 	free(author);
2578 	free(wauthor);
2579 	free(line);
2580 	return err;
2581 }
2582 
2583 static struct commit_queue_entry *
2584 alloc_commit_queue_entry(struct got_commit_object *commit,
2585     struct got_object_id *id)
2586 {
2587 	struct commit_queue_entry *entry;
2588 	struct got_object_id *dup;
2589 
2590 	entry = calloc(1, sizeof(*entry));
2591 	if (entry == NULL)
2592 		return NULL;
2593 
2594 	dup = got_object_id_dup(id);
2595 	if (dup == NULL) {
2596 		free(entry);
2597 		return NULL;
2598 	}
2599 
2600 	entry->id = dup;
2601 	entry->commit = commit;
2602 	return entry;
2603 }
2604 
2605 static void
2606 pop_commit(struct commit_queue *commits)
2607 {
2608 	struct commit_queue_entry *entry;
2609 
2610 	entry = TAILQ_FIRST(&commits->head);
2611 	TAILQ_REMOVE(&commits->head, entry, entry);
2612 	got_object_commit_close(entry->commit);
2613 	commits->ncommits--;
2614 	free(entry->id);
2615 	free(entry);
2616 }
2617 
2618 static void
2619 free_commits(struct commit_queue *commits)
2620 {
2621 	while (!TAILQ_EMPTY(&commits->head))
2622 		pop_commit(commits);
2623 }
2624 
2625 static const struct got_error *
2626 match_commit(int *have_match, struct got_object_id *id,
2627     struct got_commit_object *commit, regex_t *regex)
2628 {
2629 	const struct got_error *err = NULL;
2630 	regmatch_t regmatch;
2631 	char *id_str = NULL, *logmsg = NULL;
2632 
2633 	*have_match = 0;
2634 
2635 	err = got_object_id_str(&id_str, id);
2636 	if (err)
2637 		return err;
2638 
2639 	err = got_object_commit_get_logmsg(&logmsg, commit);
2640 	if (err)
2641 		goto done;
2642 
2643 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2644 	    &regmatch, 0) == 0 ||
2645 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2646 	    &regmatch, 0) == 0 ||
2647 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2648 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2649 		*have_match = 1;
2650 done:
2651 	free(id_str);
2652 	free(logmsg);
2653 	return err;
2654 }
2655 
2656 static const struct got_error *
2657 queue_commits(struct tog_log_thread_args *a)
2658 {
2659 	const struct got_error *err = NULL;
2660 
2661 	/*
2662 	 * We keep all commits open throughout the lifetime of the log
2663 	 * view in order to avoid having to re-fetch commits from disk
2664 	 * while updating the display.
2665 	 */
2666 	do {
2667 		struct got_object_id id;
2668 		struct got_commit_object *commit;
2669 		struct commit_queue_entry *entry;
2670 		int limit_match = 0;
2671 		int errcode;
2672 
2673 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2674 		    NULL, NULL);
2675 		if (err)
2676 			break;
2677 
2678 		err = got_object_open_as_commit(&commit, a->repo, &id);
2679 		if (err)
2680 			break;
2681 		entry = alloc_commit_queue_entry(commit, &id);
2682 		if (entry == NULL) {
2683 			err = got_error_from_errno("alloc_commit_queue_entry");
2684 			break;
2685 		}
2686 
2687 		errcode = pthread_mutex_lock(&tog_mutex);
2688 		if (errcode) {
2689 			err = got_error_set_errno(errcode,
2690 			    "pthread_mutex_lock");
2691 			break;
2692 		}
2693 
2694 		entry->idx = a->real_commits->ncommits;
2695 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2696 		a->real_commits->ncommits++;
2697 
2698 		if (*a->limiting) {
2699 			err = match_commit(&limit_match, &id, commit,
2700 			    a->limit_regex);
2701 			if (err)
2702 				break;
2703 
2704 			if (limit_match) {
2705 				struct commit_queue_entry *matched;
2706 
2707 				matched = alloc_commit_queue_entry(
2708 				    entry->commit, entry->id);
2709 				if (matched == NULL) {
2710 					err = got_error_from_errno(
2711 					    "alloc_commit_queue_entry");
2712 					break;
2713 				}
2714 				matched->commit = entry->commit;
2715 				got_object_commit_retain(entry->commit);
2716 
2717 				matched->idx = a->limit_commits->ncommits;
2718 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2719 				    matched, entry);
2720 				a->limit_commits->ncommits++;
2721 			}
2722 
2723 			/*
2724 			 * This is how we signal log_thread() that we
2725 			 * have found a match, and that it should be
2726 			 * counted as a new entry for the view.
2727 			 */
2728 			a->limit_match = limit_match;
2729 		}
2730 
2731 		if (*a->searching == TOG_SEARCH_FORWARD &&
2732 		    !*a->search_next_done) {
2733 			int have_match;
2734 			err = match_commit(&have_match, &id, commit, a->regex);
2735 			if (err)
2736 				break;
2737 
2738 			if (*a->limiting) {
2739 				if (limit_match && have_match)
2740 					*a->search_next_done =
2741 					    TOG_SEARCH_HAVE_MORE;
2742 			} else if (have_match)
2743 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2744 		}
2745 
2746 		errcode = pthread_mutex_unlock(&tog_mutex);
2747 		if (errcode && err == NULL)
2748 			err = got_error_set_errno(errcode,
2749 			    "pthread_mutex_unlock");
2750 		if (err)
2751 			break;
2752 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2753 
2754 	return err;
2755 }
2756 
2757 static void
2758 select_commit(struct tog_log_view_state *s)
2759 {
2760 	struct commit_queue_entry *entry;
2761 	int ncommits = 0;
2762 
2763 	entry = s->first_displayed_entry;
2764 	while (entry) {
2765 		if (ncommits == s->selected) {
2766 			s->selected_entry = entry;
2767 			break;
2768 		}
2769 		entry = TAILQ_NEXT(entry, entry);
2770 		ncommits++;
2771 	}
2772 }
2773 
2774 static const struct got_error *
2775 draw_commits(struct tog_view *view)
2776 {
2777 	const struct got_error *err = NULL;
2778 	struct tog_log_view_state *s = &view->state.log;
2779 	struct commit_queue_entry *entry = s->selected_entry;
2780 	int limit = view->nlines;
2781 	int width;
2782 	int ncommits, author_cols = 4, refstr_cols;
2783 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2784 	char *refs_str = NULL;
2785 	wchar_t *wline;
2786 	struct tog_color *tc;
2787 	static const size_t date_display_cols = 12;
2788 	struct got_reflist_head *refs;
2789 
2790 	if (view_is_hsplit_top(view))
2791 		--limit;  /* account for border */
2792 
2793 	if (s->selected_entry &&
2794 	    !(view->searching && view->search_next_done == 0)) {
2795 		err = got_object_id_str(&id_str, s->selected_entry->id);
2796 		if (err)
2797 			return err;
2798 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2799 		    s->selected_entry->id);
2800 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2801 		    s->repo);
2802 		if (err)
2803 			goto done;
2804 	}
2805 
2806 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2807 		halfdelay(10); /* disable fast refresh */
2808 
2809 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2810 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2811 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2812 		    (view->searching && !view->search_next_done) ?
2813 		    "searching..." : "loading...") == -1) {
2814 			err = got_error_from_errno("asprintf");
2815 			goto done;
2816 		}
2817 	} else {
2818 		const char *search_str = NULL;
2819 		const char *limit_str = NULL;
2820 
2821 		if (view->searching) {
2822 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2823 				search_str = "no more matches";
2824 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2825 				search_str = "no matches found";
2826 			else if (!view->search_next_done)
2827 				search_str = "searching...";
2828 		}
2829 
2830 		if (s->limit_view && s->commits->ncommits == 0)
2831 			limit_str = "no matches found";
2832 
2833 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2834 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2835 		    search_str ? search_str : (refs_str ? refs_str : ""),
2836 		    limit_str ? limit_str : "") == -1) {
2837 			err = got_error_from_errno("asprintf");
2838 			goto done;
2839 		}
2840 	}
2841 
2842 	free(refs_str);
2843 	refs_str = NULL;
2844 
2845 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2846 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2847 		    "........................................",
2848 		    s->in_repo_path, ncommits_str) == -1) {
2849 			err = got_error_from_errno("asprintf");
2850 			header = NULL;
2851 			goto done;
2852 		}
2853 	} else if (asprintf(&header, "commit %s%s",
2854 	    id_str ? id_str : "........................................",
2855 	    ncommits_str) == -1) {
2856 		err = got_error_from_errno("asprintf");
2857 		header = NULL;
2858 		goto done;
2859 	}
2860 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2861 	if (err)
2862 		goto done;
2863 
2864 	werase(view->window);
2865 
2866 	if (view_needs_focus_indication(view))
2867 		wstandout(view->window);
2868 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2869 	if (tc)
2870 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2871 	waddwstr(view->window, wline);
2872 	while (width < view->ncols) {
2873 		waddch(view->window, ' ');
2874 		width++;
2875 	}
2876 	if (tc)
2877 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2878 	if (view_needs_focus_indication(view))
2879 		wstandend(view->window);
2880 	free(wline);
2881 	if (limit <= 1)
2882 		goto done;
2883 
2884 	/* Grow author column size if necessary, and set view->maxx. */
2885 	entry = s->first_displayed_entry;
2886 	ncommits = 0;
2887 	view->maxx = 0;
2888 	while (entry) {
2889 		struct got_commit_object *c = entry->commit;
2890 		char *author, *eol, *msg, *msg0;
2891 		wchar_t *wauthor, *wmsg;
2892 		int width;
2893 		if (ncommits >= limit - 1)
2894 			break;
2895 		if (s->use_committer)
2896 			author = strdup(got_object_commit_get_committer(c));
2897 		else
2898 			author = strdup(got_object_commit_get_author(c));
2899 		if (author == NULL) {
2900 			err = got_error_from_errno("strdup");
2901 			goto done;
2902 		}
2903 		err = format_author(&wauthor, &width, author, COLS,
2904 		    date_display_cols);
2905 		if (author_cols < width)
2906 			author_cols = width;
2907 		free(wauthor);
2908 		free(author);
2909 		if (err)
2910 			goto done;
2911 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2912 		    entry->id);
2913 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2914 		if (err)
2915 			goto done;
2916 		if (refs_str) {
2917 			wchar_t *ws;
2918 			err = format_line(&ws, &width, NULL, refs_str,
2919 			    0, INT_MAX, date_display_cols + author_cols, 0);
2920 			free(ws);
2921 			free(refs_str);
2922 			refs_str = NULL;
2923 			if (err)
2924 				goto done;
2925 			refstr_cols = width + 3; /* account for [ ] + space */
2926 		} else
2927 			refstr_cols = 0;
2928 		err = got_object_commit_get_logmsg(&msg0, c);
2929 		if (err)
2930 			goto done;
2931 		msg = msg0;
2932 		while (*msg == '\n')
2933 			++msg;
2934 		if ((eol = strchr(msg, '\n')))
2935 			*eol = '\0';
2936 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2937 		    date_display_cols + author_cols + refstr_cols, 0);
2938 		if (err)
2939 			goto done;
2940 		view->maxx = MAX(view->maxx, width + refstr_cols);
2941 		free(msg0);
2942 		free(wmsg);
2943 		ncommits++;
2944 		entry = TAILQ_NEXT(entry, entry);
2945 	}
2946 
2947 	entry = s->first_displayed_entry;
2948 	s->last_displayed_entry = s->first_displayed_entry;
2949 	ncommits = 0;
2950 	while (entry) {
2951 		if (ncommits >= limit - 1)
2952 			break;
2953 		if (ncommits == s->selected)
2954 			wstandout(view->window);
2955 		err = draw_commit(view, entry->commit, entry->id,
2956 		    date_display_cols, author_cols);
2957 		if (ncommits == s->selected)
2958 			wstandend(view->window);
2959 		if (err)
2960 			goto done;
2961 		ncommits++;
2962 		s->last_displayed_entry = entry;
2963 		entry = TAILQ_NEXT(entry, entry);
2964 	}
2965 
2966 	view_border(view);
2967 done:
2968 	free(id_str);
2969 	free(refs_str);
2970 	free(ncommits_str);
2971 	free(header);
2972 	return err;
2973 }
2974 
2975 static void
2976 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2977 {
2978 	struct commit_queue_entry *entry;
2979 	int nscrolled = 0;
2980 
2981 	entry = TAILQ_FIRST(&s->commits->head);
2982 	if (s->first_displayed_entry == entry)
2983 		return;
2984 
2985 	entry = s->first_displayed_entry;
2986 	while (entry && nscrolled < maxscroll) {
2987 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2988 		if (entry) {
2989 			s->first_displayed_entry = entry;
2990 			nscrolled++;
2991 		}
2992 	}
2993 }
2994 
2995 static const struct got_error *
2996 trigger_log_thread(struct tog_view *view, int wait)
2997 {
2998 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2999 	int errcode;
3000 
3001 	if (!using_mock_io)
3002 		halfdelay(1); /* fast refresh while loading commits */
3003 
3004 	while (!ta->log_complete && !tog_thread_error &&
3005 	    (ta->commits_needed > 0 || ta->load_all)) {
3006 		/* Wake the log thread. */
3007 		errcode = pthread_cond_signal(&ta->need_commits);
3008 		if (errcode)
3009 			return got_error_set_errno(errcode,
3010 			    "pthread_cond_signal");
3011 
3012 		/*
3013 		 * The mutex will be released while the view loop waits
3014 		 * in wgetch(), at which time the log thread will run.
3015 		 */
3016 		if (!wait)
3017 			break;
3018 
3019 		/* Display progress update in log view. */
3020 		show_log_view(view);
3021 		update_panels();
3022 		doupdate();
3023 
3024 		/* Wait right here while next commit is being loaded. */
3025 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3026 		if (errcode)
3027 			return got_error_set_errno(errcode,
3028 			    "pthread_cond_wait");
3029 
3030 		/* Display progress update in log view. */
3031 		show_log_view(view);
3032 		update_panels();
3033 		doupdate();
3034 	}
3035 
3036 	return NULL;
3037 }
3038 
3039 static const struct got_error *
3040 request_log_commits(struct tog_view *view)
3041 {
3042 	struct tog_log_view_state	*state = &view->state.log;
3043 	const struct got_error		*err = NULL;
3044 
3045 	if (state->thread_args.log_complete)
3046 		return NULL;
3047 
3048 	state->thread_args.commits_needed += view->nscrolled;
3049 	err = trigger_log_thread(view, 1);
3050 	view->nscrolled = 0;
3051 
3052 	return err;
3053 }
3054 
3055 static const struct got_error *
3056 log_scroll_down(struct tog_view *view, int maxscroll)
3057 {
3058 	struct tog_log_view_state *s = &view->state.log;
3059 	const struct got_error *err = NULL;
3060 	struct commit_queue_entry *pentry;
3061 	int nscrolled = 0, ncommits_needed;
3062 
3063 	if (s->last_displayed_entry == NULL)
3064 		return NULL;
3065 
3066 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3067 	if (s->commits->ncommits < ncommits_needed &&
3068 	    !s->thread_args.log_complete) {
3069 		/*
3070 		 * Ask the log thread for required amount of commits.
3071 		 */
3072 		s->thread_args.commits_needed +=
3073 		    ncommits_needed - s->commits->ncommits;
3074 		err = trigger_log_thread(view, 1);
3075 		if (err)
3076 			return err;
3077 	}
3078 
3079 	do {
3080 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3081 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3082 			break;
3083 
3084 		s->last_displayed_entry = pentry ?
3085 		    pentry : s->last_displayed_entry;
3086 
3087 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3088 		if (pentry == NULL)
3089 			break;
3090 		s->first_displayed_entry = pentry;
3091 	} while (++nscrolled < maxscroll);
3092 
3093 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3094 		view->nscrolled += nscrolled;
3095 	else
3096 		view->nscrolled = 0;
3097 
3098 	return err;
3099 }
3100 
3101 static const struct got_error *
3102 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3103     struct got_commit_object *commit, struct got_object_id *commit_id,
3104     struct tog_view *log_view, struct got_repository *repo)
3105 {
3106 	const struct got_error *err;
3107 	struct got_object_qid *parent_id;
3108 	struct tog_view *diff_view;
3109 
3110 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3111 	if (diff_view == NULL)
3112 		return got_error_from_errno("view_open");
3113 
3114 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3115 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3116 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3117 	if (err == NULL)
3118 		*new_view = diff_view;
3119 	return err;
3120 }
3121 
3122 static const struct got_error *
3123 tree_view_visit_subtree(struct tog_tree_view_state *s,
3124     struct got_tree_object *subtree)
3125 {
3126 	struct tog_parent_tree *parent;
3127 
3128 	parent = calloc(1, sizeof(*parent));
3129 	if (parent == NULL)
3130 		return got_error_from_errno("calloc");
3131 
3132 	parent->tree = s->tree;
3133 	parent->first_displayed_entry = s->first_displayed_entry;
3134 	parent->selected_entry = s->selected_entry;
3135 	parent->selected = s->selected;
3136 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3137 	s->tree = subtree;
3138 	s->selected = 0;
3139 	s->first_displayed_entry = NULL;
3140 	return NULL;
3141 }
3142 
3143 static const struct got_error *
3144 tree_view_walk_path(struct tog_tree_view_state *s,
3145     struct got_commit_object *commit, const char *path)
3146 {
3147 	const struct got_error *err = NULL;
3148 	struct got_tree_object *tree = NULL;
3149 	const char *p;
3150 	char *slash, *subpath = NULL;
3151 
3152 	/* Walk the path and open corresponding tree objects. */
3153 	p = path;
3154 	while (*p) {
3155 		struct got_tree_entry *te;
3156 		struct got_object_id *tree_id;
3157 		char *te_name;
3158 
3159 		while (p[0] == '/')
3160 			p++;
3161 
3162 		/* Ensure the correct subtree entry is selected. */
3163 		slash = strchr(p, '/');
3164 		if (slash == NULL)
3165 			te_name = strdup(p);
3166 		else
3167 			te_name = strndup(p, slash - p);
3168 		if (te_name == NULL) {
3169 			err = got_error_from_errno("strndup");
3170 			break;
3171 		}
3172 		te = got_object_tree_find_entry(s->tree, te_name);
3173 		if (te == NULL) {
3174 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3175 			free(te_name);
3176 			break;
3177 		}
3178 		free(te_name);
3179 		s->first_displayed_entry = s->selected_entry = te;
3180 
3181 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3182 			break; /* jump to this file's entry */
3183 
3184 		slash = strchr(p, '/');
3185 		if (slash)
3186 			subpath = strndup(path, slash - path);
3187 		else
3188 			subpath = strdup(path);
3189 		if (subpath == NULL) {
3190 			err = got_error_from_errno("strdup");
3191 			break;
3192 		}
3193 
3194 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3195 		    subpath);
3196 		if (err)
3197 			break;
3198 
3199 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3200 		free(tree_id);
3201 		if (err)
3202 			break;
3203 
3204 		err = tree_view_visit_subtree(s, tree);
3205 		if (err) {
3206 			got_object_tree_close(tree);
3207 			break;
3208 		}
3209 		if (slash == NULL)
3210 			break;
3211 		free(subpath);
3212 		subpath = NULL;
3213 		p = slash;
3214 	}
3215 
3216 	free(subpath);
3217 	return err;
3218 }
3219 
3220 static const struct got_error *
3221 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3222     struct commit_queue_entry *entry, const char *path,
3223     const char *head_ref_name, struct got_repository *repo)
3224 {
3225 	const struct got_error *err = NULL;
3226 	struct tog_tree_view_state *s;
3227 	struct tog_view *tree_view;
3228 
3229 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3230 	if (tree_view == NULL)
3231 		return got_error_from_errno("view_open");
3232 
3233 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3234 	if (err)
3235 		return err;
3236 	s = &tree_view->state.tree;
3237 
3238 	*new_view = tree_view;
3239 
3240 	if (got_path_is_root_dir(path))
3241 		return NULL;
3242 
3243 	return tree_view_walk_path(s, entry->commit, path);
3244 }
3245 
3246 static const struct got_error *
3247 block_signals_used_by_main_thread(void)
3248 {
3249 	sigset_t sigset;
3250 	int errcode;
3251 
3252 	if (sigemptyset(&sigset) == -1)
3253 		return got_error_from_errno("sigemptyset");
3254 
3255 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3256 	if (sigaddset(&sigset, SIGWINCH) == -1)
3257 		return got_error_from_errno("sigaddset");
3258 	if (sigaddset(&sigset, SIGCONT) == -1)
3259 		return got_error_from_errno("sigaddset");
3260 	if (sigaddset(&sigset, SIGINT) == -1)
3261 		return got_error_from_errno("sigaddset");
3262 	if (sigaddset(&sigset, SIGTERM) == -1)
3263 		return got_error_from_errno("sigaddset");
3264 
3265 	/* ncurses handles SIGTSTP */
3266 	if (sigaddset(&sigset, SIGTSTP) == -1)
3267 		return got_error_from_errno("sigaddset");
3268 
3269 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3270 	if (errcode)
3271 		return got_error_set_errno(errcode, "pthread_sigmask");
3272 
3273 	return NULL;
3274 }
3275 
3276 static void *
3277 log_thread(void *arg)
3278 {
3279 	const struct got_error *err = NULL;
3280 	int errcode = 0;
3281 	struct tog_log_thread_args *a = arg;
3282 	int done = 0;
3283 
3284 	/*
3285 	 * Sync startup with main thread such that we begin our
3286 	 * work once view_input() has released the mutex.
3287 	 */
3288 	errcode = pthread_mutex_lock(&tog_mutex);
3289 	if (errcode) {
3290 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3291 		return (void *)err;
3292 	}
3293 
3294 	err = block_signals_used_by_main_thread();
3295 	if (err) {
3296 		pthread_mutex_unlock(&tog_mutex);
3297 		goto done;
3298 	}
3299 
3300 	while (!done && !err && !tog_fatal_signal_received()) {
3301 		errcode = pthread_mutex_unlock(&tog_mutex);
3302 		if (errcode) {
3303 			err = got_error_set_errno(errcode,
3304 			    "pthread_mutex_unlock");
3305 			goto done;
3306 		}
3307 		err = queue_commits(a);
3308 		if (err) {
3309 			if (err->code != GOT_ERR_ITER_COMPLETED)
3310 				goto done;
3311 			err = NULL;
3312 			done = 1;
3313 		} else if (a->commits_needed > 0 && !a->load_all) {
3314 			if (*a->limiting) {
3315 				if (a->limit_match)
3316 					a->commits_needed--;
3317 			} else
3318 				a->commits_needed--;
3319 		}
3320 
3321 		errcode = pthread_mutex_lock(&tog_mutex);
3322 		if (errcode) {
3323 			err = got_error_set_errno(errcode,
3324 			    "pthread_mutex_lock");
3325 			goto done;
3326 		} else if (*a->quit)
3327 			done = 1;
3328 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3329 			*a->first_displayed_entry =
3330 			    TAILQ_FIRST(&a->limit_commits->head);
3331 			*a->selected_entry = *a->first_displayed_entry;
3332 		} else if (*a->first_displayed_entry == NULL) {
3333 			*a->first_displayed_entry =
3334 			    TAILQ_FIRST(&a->real_commits->head);
3335 			*a->selected_entry = *a->first_displayed_entry;
3336 		}
3337 
3338 		errcode = pthread_cond_signal(&a->commit_loaded);
3339 		if (errcode) {
3340 			err = got_error_set_errno(errcode,
3341 			    "pthread_cond_signal");
3342 			pthread_mutex_unlock(&tog_mutex);
3343 			goto done;
3344 		}
3345 
3346 		if (done)
3347 			a->commits_needed = 0;
3348 		else {
3349 			if (a->commits_needed == 0 && !a->load_all) {
3350 				errcode = pthread_cond_wait(&a->need_commits,
3351 				    &tog_mutex);
3352 				if (errcode) {
3353 					err = got_error_set_errno(errcode,
3354 					    "pthread_cond_wait");
3355 					pthread_mutex_unlock(&tog_mutex);
3356 					goto done;
3357 				}
3358 				if (*a->quit)
3359 					done = 1;
3360 			}
3361 		}
3362 	}
3363 	a->log_complete = 1;
3364 	errcode = pthread_mutex_unlock(&tog_mutex);
3365 	if (errcode)
3366 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3367 done:
3368 	if (err) {
3369 		tog_thread_error = 1;
3370 		pthread_cond_signal(&a->commit_loaded);
3371 	}
3372 	return (void *)err;
3373 }
3374 
3375 static const struct got_error *
3376 stop_log_thread(struct tog_log_view_state *s)
3377 {
3378 	const struct got_error *err = NULL, *thread_err = NULL;
3379 	int errcode;
3380 
3381 	if (s->thread) {
3382 		s->quit = 1;
3383 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3384 		if (errcode)
3385 			return got_error_set_errno(errcode,
3386 			    "pthread_cond_signal");
3387 		errcode = pthread_mutex_unlock(&tog_mutex);
3388 		if (errcode)
3389 			return got_error_set_errno(errcode,
3390 			    "pthread_mutex_unlock");
3391 		errcode = pthread_join(s->thread, (void **)&thread_err);
3392 		if (errcode)
3393 			return got_error_set_errno(errcode, "pthread_join");
3394 		errcode = pthread_mutex_lock(&tog_mutex);
3395 		if (errcode)
3396 			return got_error_set_errno(errcode,
3397 			    "pthread_mutex_lock");
3398 		s->thread = 0; //NULL;
3399 	}
3400 
3401 	if (s->thread_args.repo) {
3402 		err = got_repo_close(s->thread_args.repo);
3403 		s->thread_args.repo = NULL;
3404 	}
3405 
3406 	if (s->thread_args.pack_fds) {
3407 		const struct got_error *pack_err =
3408 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3409 		if (err == NULL)
3410 			err = pack_err;
3411 		s->thread_args.pack_fds = NULL;
3412 	}
3413 
3414 	if (s->thread_args.graph) {
3415 		got_commit_graph_close(s->thread_args.graph);
3416 		s->thread_args.graph = NULL;
3417 	}
3418 
3419 	return err ? err : thread_err;
3420 }
3421 
3422 static const struct got_error *
3423 close_log_view(struct tog_view *view)
3424 {
3425 	const struct got_error *err = NULL;
3426 	struct tog_log_view_state *s = &view->state.log;
3427 	int errcode;
3428 
3429 	err = stop_log_thread(s);
3430 
3431 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3432 	if (errcode && err == NULL)
3433 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3434 
3435 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3436 	if (errcode && err == NULL)
3437 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3438 
3439 	free_commits(&s->limit_commits);
3440 	free_commits(&s->real_commits);
3441 	free(s->in_repo_path);
3442 	s->in_repo_path = NULL;
3443 	free(s->start_id);
3444 	s->start_id = NULL;
3445 	free(s->head_ref_name);
3446 	s->head_ref_name = NULL;
3447 	return err;
3448 }
3449 
3450 /*
3451  * We use two queues to implement the limit feature: first consists of
3452  * commits matching the current limit_regex; second is the real queue
3453  * of all known commits (real_commits). When the user starts limiting,
3454  * we swap queues such that all movement and displaying functionality
3455  * works with very slight change.
3456  */
3457 static const struct got_error *
3458 limit_log_view(struct tog_view *view)
3459 {
3460 	struct tog_log_view_state *s = &view->state.log;
3461 	struct commit_queue_entry *entry;
3462 	struct tog_view	*v = view;
3463 	const struct got_error *err = NULL;
3464 	char pattern[1024];
3465 	int ret;
3466 
3467 	if (view_is_hsplit_top(view))
3468 		v = view->child;
3469 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3470 		v = view->parent;
3471 
3472 	/* Get the pattern */
3473 	wmove(v->window, v->nlines - 1, 0);
3474 	wclrtoeol(v->window);
3475 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3476 	nodelay(v->window, FALSE);
3477 	nocbreak();
3478 	echo();
3479 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3480 	cbreak();
3481 	noecho();
3482 	nodelay(v->window, TRUE);
3483 	if (ret == ERR)
3484 		return NULL;
3485 
3486 	if (*pattern == '\0') {
3487 		/*
3488 		 * Safety measure for the situation where the user
3489 		 * resets limit without previously limiting anything.
3490 		 */
3491 		if (!s->limit_view)
3492 			return NULL;
3493 
3494 		/*
3495 		 * User could have pressed Ctrl+L, which refreshed the
3496 		 * commit queues, it means we can't save previously
3497 		 * (before limit took place) displayed entries,
3498 		 * because they would point to already free'ed memory,
3499 		 * so we are forced to always select first entry of
3500 		 * the queue.
3501 		 */
3502 		s->commits = &s->real_commits;
3503 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3504 		s->selected_entry = s->first_displayed_entry;
3505 		s->selected = 0;
3506 		s->limit_view = 0;
3507 
3508 		return NULL;
3509 	}
3510 
3511 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3512 		return NULL;
3513 
3514 	s->limit_view = 1;
3515 
3516 	/* Clear the screen while loading limit view */
3517 	s->first_displayed_entry = NULL;
3518 	s->last_displayed_entry = NULL;
3519 	s->selected_entry = NULL;
3520 	s->commits = &s->limit_commits;
3521 
3522 	/* Prepare limit queue for new search */
3523 	free_commits(&s->limit_commits);
3524 	s->limit_commits.ncommits = 0;
3525 
3526 	/* First process commits, which are in queue already */
3527 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3528 		int have_match = 0;
3529 
3530 		err = match_commit(&have_match, entry->id,
3531 		    entry->commit, &s->limit_regex);
3532 		if (err)
3533 			return err;
3534 
3535 		if (have_match) {
3536 			struct commit_queue_entry *matched;
3537 
3538 			matched = alloc_commit_queue_entry(entry->commit,
3539 			    entry->id);
3540 			if (matched == NULL) {
3541 				err = got_error_from_errno(
3542 				    "alloc_commit_queue_entry");
3543 				break;
3544 			}
3545 			matched->commit = entry->commit;
3546 			got_object_commit_retain(entry->commit);
3547 
3548 			matched->idx = s->limit_commits.ncommits;
3549 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3550 			    matched, entry);
3551 			s->limit_commits.ncommits++;
3552 		}
3553 	}
3554 
3555 	/* Second process all the commits, until we fill the screen */
3556 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3557 	    !s->thread_args.log_complete) {
3558 		s->thread_args.commits_needed +=
3559 		    view->nlines - s->limit_commits.ncommits - 1;
3560 		err = trigger_log_thread(view, 1);
3561 		if (err)
3562 			return err;
3563 	}
3564 
3565 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3566 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3567 	s->selected = 0;
3568 
3569 	return NULL;
3570 }
3571 
3572 static const struct got_error *
3573 search_start_log_view(struct tog_view *view)
3574 {
3575 	struct tog_log_view_state *s = &view->state.log;
3576 
3577 	s->matched_entry = NULL;
3578 	s->search_entry = NULL;
3579 	return NULL;
3580 }
3581 
3582 static const struct got_error *
3583 search_next_log_view(struct tog_view *view)
3584 {
3585 	const struct got_error *err = NULL;
3586 	struct tog_log_view_state *s = &view->state.log;
3587 	struct commit_queue_entry *entry;
3588 
3589 	/* Display progress update in log view. */
3590 	show_log_view(view);
3591 	update_panels();
3592 	doupdate();
3593 
3594 	if (s->search_entry) {
3595 		int errcode, ch;
3596 		errcode = pthread_mutex_unlock(&tog_mutex);
3597 		if (errcode)
3598 			return got_error_set_errno(errcode,
3599 			    "pthread_mutex_unlock");
3600 		ch = wgetch(view->window);
3601 		errcode = pthread_mutex_lock(&tog_mutex);
3602 		if (errcode)
3603 			return got_error_set_errno(errcode,
3604 			    "pthread_mutex_lock");
3605 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3606 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3607 			return NULL;
3608 		}
3609 		if (view->searching == TOG_SEARCH_FORWARD)
3610 			entry = TAILQ_NEXT(s->search_entry, entry);
3611 		else
3612 			entry = TAILQ_PREV(s->search_entry,
3613 			    commit_queue_head, entry);
3614 	} else if (s->matched_entry) {
3615 		/*
3616 		 * If the user has moved the cursor after we hit a match,
3617 		 * the position from where we should continue searching
3618 		 * might have changed.
3619 		 */
3620 		if (view->searching == TOG_SEARCH_FORWARD)
3621 			entry = TAILQ_NEXT(s->selected_entry, entry);
3622 		else
3623 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3624 			    entry);
3625 	} else {
3626 		entry = s->selected_entry;
3627 	}
3628 
3629 	while (1) {
3630 		int have_match = 0;
3631 
3632 		if (entry == NULL) {
3633 			if (s->thread_args.log_complete ||
3634 			    view->searching == TOG_SEARCH_BACKWARD) {
3635 				view->search_next_done =
3636 				    (s->matched_entry == NULL ?
3637 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3638 				s->search_entry = NULL;
3639 				return NULL;
3640 			}
3641 			/*
3642 			 * Poke the log thread for more commits and return,
3643 			 * allowing the main loop to make progress. Search
3644 			 * will resume at s->search_entry once we come back.
3645 			 */
3646 			s->thread_args.commits_needed++;
3647 			return trigger_log_thread(view, 0);
3648 		}
3649 
3650 		err = match_commit(&have_match, entry->id, entry->commit,
3651 		    &view->regex);
3652 		if (err)
3653 			break;
3654 		if (have_match) {
3655 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3656 			s->matched_entry = entry;
3657 			break;
3658 		}
3659 
3660 		s->search_entry = entry;
3661 		if (view->searching == TOG_SEARCH_FORWARD)
3662 			entry = TAILQ_NEXT(entry, entry);
3663 		else
3664 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3665 	}
3666 
3667 	if (s->matched_entry) {
3668 		int cur = s->selected_entry->idx;
3669 		while (cur < s->matched_entry->idx) {
3670 			err = input_log_view(NULL, view, KEY_DOWN);
3671 			if (err)
3672 				return err;
3673 			cur++;
3674 		}
3675 		while (cur > s->matched_entry->idx) {
3676 			err = input_log_view(NULL, view, KEY_UP);
3677 			if (err)
3678 				return err;
3679 			cur--;
3680 		}
3681 	}
3682 
3683 	s->search_entry = NULL;
3684 
3685 	return NULL;
3686 }
3687 
3688 static const struct got_error *
3689 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3690     struct got_repository *repo, const char *head_ref_name,
3691     const char *in_repo_path, int log_branches)
3692 {
3693 	const struct got_error *err = NULL;
3694 	struct tog_log_view_state *s = &view->state.log;
3695 	struct got_repository *thread_repo = NULL;
3696 	struct got_commit_graph *thread_graph = NULL;
3697 	int errcode;
3698 
3699 	if (in_repo_path != s->in_repo_path) {
3700 		free(s->in_repo_path);
3701 		s->in_repo_path = strdup(in_repo_path);
3702 		if (s->in_repo_path == NULL) {
3703 			err = got_error_from_errno("strdup");
3704 			goto done;
3705 		}
3706 	}
3707 
3708 	/* The commit queue only contains commits being displayed. */
3709 	TAILQ_INIT(&s->real_commits.head);
3710 	s->real_commits.ncommits = 0;
3711 	s->commits = &s->real_commits;
3712 
3713 	TAILQ_INIT(&s->limit_commits.head);
3714 	s->limit_view = 0;
3715 	s->limit_commits.ncommits = 0;
3716 
3717 	s->repo = repo;
3718 	if (head_ref_name) {
3719 		s->head_ref_name = strdup(head_ref_name);
3720 		if (s->head_ref_name == NULL) {
3721 			err = got_error_from_errno("strdup");
3722 			goto done;
3723 		}
3724 	}
3725 	s->start_id = got_object_id_dup(start_id);
3726 	if (s->start_id == NULL) {
3727 		err = got_error_from_errno("got_object_id_dup");
3728 		goto done;
3729 	}
3730 	s->log_branches = log_branches;
3731 	s->use_committer = 1;
3732 
3733 	STAILQ_INIT(&s->colors);
3734 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3735 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3736 		    get_color_value("TOG_COLOR_COMMIT"));
3737 		if (err)
3738 			goto done;
3739 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3740 		    get_color_value("TOG_COLOR_AUTHOR"));
3741 		if (err) {
3742 			free_colors(&s->colors);
3743 			goto done;
3744 		}
3745 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3746 		    get_color_value("TOG_COLOR_DATE"));
3747 		if (err) {
3748 			free_colors(&s->colors);
3749 			goto done;
3750 		}
3751 	}
3752 
3753 	view->show = show_log_view;
3754 	view->input = input_log_view;
3755 	view->resize = resize_log_view;
3756 	view->close = close_log_view;
3757 	view->search_start = search_start_log_view;
3758 	view->search_next = search_next_log_view;
3759 
3760 	if (s->thread_args.pack_fds == NULL) {
3761 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3762 		if (err)
3763 			goto done;
3764 	}
3765 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3766 	    s->thread_args.pack_fds);
3767 	if (err)
3768 		goto done;
3769 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3770 	    !s->log_branches);
3771 	if (err)
3772 		goto done;
3773 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3774 	    s->repo, NULL, NULL);
3775 	if (err)
3776 		goto done;
3777 
3778 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3779 	if (errcode) {
3780 		err = got_error_set_errno(errcode, "pthread_cond_init");
3781 		goto done;
3782 	}
3783 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3784 	if (errcode) {
3785 		err = got_error_set_errno(errcode, "pthread_cond_init");
3786 		goto done;
3787 	}
3788 
3789 	s->thread_args.commits_needed = view->nlines;
3790 	s->thread_args.graph = thread_graph;
3791 	s->thread_args.real_commits = &s->real_commits;
3792 	s->thread_args.limit_commits = &s->limit_commits;
3793 	s->thread_args.in_repo_path = s->in_repo_path;
3794 	s->thread_args.start_id = s->start_id;
3795 	s->thread_args.repo = thread_repo;
3796 	s->thread_args.log_complete = 0;
3797 	s->thread_args.quit = &s->quit;
3798 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3799 	s->thread_args.selected_entry = &s->selected_entry;
3800 	s->thread_args.searching = &view->searching;
3801 	s->thread_args.search_next_done = &view->search_next_done;
3802 	s->thread_args.regex = &view->regex;
3803 	s->thread_args.limiting = &s->limit_view;
3804 	s->thread_args.limit_regex = &s->limit_regex;
3805 	s->thread_args.limit_commits = &s->limit_commits;
3806 done:
3807 	if (err) {
3808 		if (view->close == NULL)
3809 			close_log_view(view);
3810 		view_close(view);
3811 	}
3812 	return err;
3813 }
3814 
3815 static const struct got_error *
3816 show_log_view(struct tog_view *view)
3817 {
3818 	const struct got_error *err;
3819 	struct tog_log_view_state *s = &view->state.log;
3820 
3821 	if (s->thread == 0) { //NULL) {
3822 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3823 		    &s->thread_args);
3824 		if (errcode)
3825 			return got_error_set_errno(errcode, "pthread_create");
3826 		if (s->thread_args.commits_needed > 0) {
3827 			err = trigger_log_thread(view, 1);
3828 			if (err)
3829 				return err;
3830 		}
3831 	}
3832 
3833 	return draw_commits(view);
3834 }
3835 
3836 static void
3837 log_move_cursor_up(struct tog_view *view, int page, int home)
3838 {
3839 	struct tog_log_view_state *s = &view->state.log;
3840 
3841 	if (s->first_displayed_entry == NULL)
3842 		return;
3843 	if (s->selected_entry->idx == 0)
3844 		view->count = 0;
3845 
3846 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3847 	    || home)
3848 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3849 
3850 	if (!page && !home && s->selected > 0)
3851 		--s->selected;
3852 	else
3853 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3854 
3855 	select_commit(s);
3856 	return;
3857 }
3858 
3859 static const struct got_error *
3860 log_move_cursor_down(struct tog_view *view, int page)
3861 {
3862 	struct tog_log_view_state	*s = &view->state.log;
3863 	const struct got_error		*err = NULL;
3864 	int				 eos = view->nlines - 2;
3865 
3866 	if (s->first_displayed_entry == NULL)
3867 		return NULL;
3868 
3869 	if (s->thread_args.log_complete &&
3870 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3871 		return NULL;
3872 
3873 	if (view_is_hsplit_top(view))
3874 		--eos;  /* border consumes the last line */
3875 
3876 	if (!page) {
3877 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3878 			++s->selected;
3879 		else
3880 			err = log_scroll_down(view, 1);
3881 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3882 		struct commit_queue_entry *entry;
3883 		int n;
3884 
3885 		s->selected = 0;
3886 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3887 		s->last_displayed_entry = entry;
3888 		for (n = 0; n <= eos; n++) {
3889 			if (entry == NULL)
3890 				break;
3891 			s->first_displayed_entry = entry;
3892 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3893 		}
3894 		if (n > 0)
3895 			s->selected = n - 1;
3896 	} else {
3897 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3898 		    s->thread_args.log_complete)
3899 			s->selected += MIN(page,
3900 			    s->commits->ncommits - s->selected_entry->idx - 1);
3901 		else
3902 			err = log_scroll_down(view, page);
3903 	}
3904 	if (err)
3905 		return err;
3906 
3907 	/*
3908 	 * We might necessarily overshoot in horizontal
3909 	 * splits; if so, select the last displayed commit.
3910 	 */
3911 	if (s->first_displayed_entry && s->last_displayed_entry) {
3912 		s->selected = MIN(s->selected,
3913 		    s->last_displayed_entry->idx -
3914 		    s->first_displayed_entry->idx);
3915 	}
3916 
3917 	select_commit(s);
3918 
3919 	if (s->thread_args.log_complete &&
3920 	    s->selected_entry->idx == s->commits->ncommits - 1)
3921 		view->count = 0;
3922 
3923 	return NULL;
3924 }
3925 
3926 static void
3927 view_get_split(struct tog_view *view, int *y, int *x)
3928 {
3929 	*x = 0;
3930 	*y = 0;
3931 
3932 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3933 		if (view->child && view->child->resized_y)
3934 			*y = view->child->resized_y;
3935 		else if (view->resized_y)
3936 			*y = view->resized_y;
3937 		else
3938 			*y = view_split_begin_y(view->lines);
3939 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3940 		if (view->child && view->child->resized_x)
3941 			*x = view->child->resized_x;
3942 		else if (view->resized_x)
3943 			*x = view->resized_x;
3944 		else
3945 			*x = view_split_begin_x(view->begin_x);
3946 	}
3947 }
3948 
3949 /* Split view horizontally at y and offset view->state->selected line. */
3950 static const struct got_error *
3951 view_init_hsplit(struct tog_view *view, int y)
3952 {
3953 	const struct got_error *err = NULL;
3954 
3955 	view->nlines = y;
3956 	view->ncols = COLS;
3957 	err = view_resize(view);
3958 	if (err)
3959 		return err;
3960 
3961 	err = offset_selection_down(view);
3962 
3963 	return err;
3964 }
3965 
3966 static const struct got_error *
3967 log_goto_line(struct tog_view *view, int nlines)
3968 {
3969 	const struct got_error		*err = NULL;
3970 	struct tog_log_view_state	*s = &view->state.log;
3971 	int				 g, idx = s->selected_entry->idx;
3972 
3973 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3974 		return NULL;
3975 
3976 	g = view->gline;
3977 	view->gline = 0;
3978 
3979 	if (g >= s->first_displayed_entry->idx + 1 &&
3980 	    g <= s->last_displayed_entry->idx + 1 &&
3981 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3982 		s->selected = g - s->first_displayed_entry->idx - 1;
3983 		select_commit(s);
3984 		return NULL;
3985 	}
3986 
3987 	if (idx + 1 < g) {
3988 		err = log_move_cursor_down(view, g - idx - 1);
3989 		if (!err && g > s->selected_entry->idx + 1)
3990 			err = log_move_cursor_down(view,
3991 			    g - s->first_displayed_entry->idx - 1);
3992 		if (err)
3993 			return err;
3994 	} else if (idx + 1 > g)
3995 		log_move_cursor_up(view, idx - g + 1, 0);
3996 
3997 	if (g < nlines && s->first_displayed_entry->idx == 0)
3998 		s->selected = g - 1;
3999 
4000 	select_commit(s);
4001 	return NULL;
4002 
4003 }
4004 
4005 static void
4006 horizontal_scroll_input(struct tog_view *view, int ch)
4007 {
4008 
4009 	switch (ch) {
4010 	case KEY_LEFT:
4011 	case 'h':
4012 		view->x -= MIN(view->x, 2);
4013 		if (view->x <= 0)
4014 			view->count = 0;
4015 		break;
4016 	case KEY_RIGHT:
4017 	case 'l':
4018 		if (view->x + view->ncols / 2 < view->maxx)
4019 			view->x += 2;
4020 		else
4021 			view->count = 0;
4022 		break;
4023 	case '0':
4024 		view->x = 0;
4025 		break;
4026 	case '$':
4027 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4028 		view->count = 0;
4029 		break;
4030 	default:
4031 		break;
4032 	}
4033 }
4034 
4035 static const struct got_error *
4036 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4037 {
4038 	const struct got_error *err = NULL;
4039 	struct tog_log_view_state *s = &view->state.log;
4040 	int eos, nscroll;
4041 
4042 	if (s->thread_args.load_all) {
4043 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4044 			s->thread_args.load_all = 0;
4045 		else if (s->thread_args.log_complete) {
4046 			err = log_move_cursor_down(view, s->commits->ncommits);
4047 			s->thread_args.load_all = 0;
4048 		}
4049 		if (err)
4050 			return err;
4051 	}
4052 
4053 	eos = nscroll = view->nlines - 1;
4054 	if (view_is_hsplit_top(view))
4055 		--eos;  /* border */
4056 
4057 	if (view->gline)
4058 		return log_goto_line(view, eos);
4059 
4060 	switch (ch) {
4061 	case '&':
4062 		err = limit_log_view(view);
4063 		break;
4064 	case 'q':
4065 		s->quit = 1;
4066 		break;
4067 	case '0':
4068 	case '$':
4069 	case KEY_RIGHT:
4070 	case 'l':
4071 	case KEY_LEFT:
4072 	case 'h':
4073 		horizontal_scroll_input(view, ch);
4074 		break;
4075 	case 'k':
4076 	case KEY_UP:
4077 	case '<':
4078 	case ',':
4079 	case CTRL('p'):
4080 		log_move_cursor_up(view, 0, 0);
4081 		break;
4082 	case 'g':
4083 	case '=':
4084 	case KEY_HOME:
4085 		log_move_cursor_up(view, 0, 1);
4086 		view->count = 0;
4087 		break;
4088 	case CTRL('u'):
4089 	case 'u':
4090 		nscroll /= 2;
4091 		/* FALL THROUGH */
4092 	case KEY_PPAGE:
4093 	case CTRL('b'):
4094 	case 'b':
4095 		log_move_cursor_up(view, nscroll, 0);
4096 		break;
4097 	case 'j':
4098 	case KEY_DOWN:
4099 	case '>':
4100 	case '.':
4101 	case CTRL('n'):
4102 		err = log_move_cursor_down(view, 0);
4103 		break;
4104 	case '@':
4105 		s->use_committer = !s->use_committer;
4106 		view->action = s->use_committer ?
4107 		    "show committer" : "show commit author";
4108 		break;
4109 	case 'G':
4110 	case '*':
4111 	case KEY_END: {
4112 		/* We don't know yet how many commits, so we're forced to
4113 		 * traverse them all. */
4114 		view->count = 0;
4115 		s->thread_args.load_all = 1;
4116 		if (!s->thread_args.log_complete)
4117 			return trigger_log_thread(view, 0);
4118 		err = log_move_cursor_down(view, s->commits->ncommits);
4119 		s->thread_args.load_all = 0;
4120 		break;
4121 	}
4122 	case CTRL('d'):
4123 	case 'd':
4124 		nscroll /= 2;
4125 		/* FALL THROUGH */
4126 	case KEY_NPAGE:
4127 	case CTRL('f'):
4128 	case 'f':
4129 	case ' ':
4130 		err = log_move_cursor_down(view, nscroll);
4131 		break;
4132 	case KEY_RESIZE:
4133 		if (s->selected > view->nlines - 2)
4134 			s->selected = view->nlines - 2;
4135 		if (s->selected > s->commits->ncommits - 1)
4136 			s->selected = s->commits->ncommits - 1;
4137 		select_commit(s);
4138 		if (s->commits->ncommits < view->nlines - 1 &&
4139 		    !s->thread_args.log_complete) {
4140 			s->thread_args.commits_needed += (view->nlines - 1) -
4141 			    s->commits->ncommits;
4142 			err = trigger_log_thread(view, 1);
4143 		}
4144 		break;
4145 	case KEY_ENTER:
4146 	case '\r':
4147 		view->count = 0;
4148 		if (s->selected_entry == NULL)
4149 			break;
4150 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4151 		break;
4152 	case 'T':
4153 		view->count = 0;
4154 		if (s->selected_entry == NULL)
4155 			break;
4156 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4157 		break;
4158 	case KEY_BACKSPACE:
4159 	case CTRL('l'):
4160 	case 'B':
4161 		view->count = 0;
4162 		if (ch == KEY_BACKSPACE &&
4163 		    got_path_is_root_dir(s->in_repo_path))
4164 			break;
4165 		err = stop_log_thread(s);
4166 		if (err)
4167 			return err;
4168 		if (ch == KEY_BACKSPACE) {
4169 			char *parent_path;
4170 			err = got_path_dirname(&parent_path, s->in_repo_path);
4171 			if (err)
4172 				return err;
4173 			free(s->in_repo_path);
4174 			s->in_repo_path = parent_path;
4175 			s->thread_args.in_repo_path = s->in_repo_path;
4176 		} else if (ch == CTRL('l')) {
4177 			struct got_object_id *start_id;
4178 			err = got_repo_match_object_id(&start_id, NULL,
4179 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4180 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4181 			if (err) {
4182 				if (s->head_ref_name == NULL ||
4183 				    err->code != GOT_ERR_NOT_REF)
4184 					return err;
4185 				/* Try to cope with deleted references. */
4186 				free(s->head_ref_name);
4187 				s->head_ref_name = NULL;
4188 				err = got_repo_match_object_id(&start_id,
4189 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4190 				    &tog_refs, s->repo);
4191 				if (err)
4192 					return err;
4193 			}
4194 			free(s->start_id);
4195 			s->start_id = start_id;
4196 			s->thread_args.start_id = s->start_id;
4197 		} else /* 'B' */
4198 			s->log_branches = !s->log_branches;
4199 
4200 		if (s->thread_args.pack_fds == NULL) {
4201 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4202 			if (err)
4203 				return err;
4204 		}
4205 		err = got_repo_open(&s->thread_args.repo,
4206 		    got_repo_get_path(s->repo), NULL,
4207 		    s->thread_args.pack_fds);
4208 		if (err)
4209 			return err;
4210 		tog_free_refs();
4211 		err = tog_load_refs(s->repo, 0);
4212 		if (err)
4213 			return err;
4214 		err = got_commit_graph_open(&s->thread_args.graph,
4215 		    s->in_repo_path, !s->log_branches);
4216 		if (err)
4217 			return err;
4218 		err = got_commit_graph_iter_start(s->thread_args.graph,
4219 		    s->start_id, s->repo, NULL, NULL);
4220 		if (err)
4221 			return err;
4222 		free_commits(&s->real_commits);
4223 		free_commits(&s->limit_commits);
4224 		s->first_displayed_entry = NULL;
4225 		s->last_displayed_entry = NULL;
4226 		s->selected_entry = NULL;
4227 		s->selected = 0;
4228 		s->thread_args.log_complete = 0;
4229 		s->quit = 0;
4230 		s->thread_args.commits_needed = view->lines;
4231 		s->matched_entry = NULL;
4232 		s->search_entry = NULL;
4233 		view->offset = 0;
4234 		break;
4235 	case 'R':
4236 		view->count = 0;
4237 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4238 		break;
4239 	default:
4240 		view->count = 0;
4241 		break;
4242 	}
4243 
4244 	return err;
4245 }
4246 
4247 static const struct got_error *
4248 apply_unveil(const char *repo_path, const char *worktree_path)
4249 {
4250 	const struct got_error *error;
4251 
4252 #ifdef PROFILE
4253 	if (unveil("gmon.out", "rwc") != 0)
4254 		return got_error_from_errno2("unveil", "gmon.out");
4255 #endif
4256 	if (repo_path && unveil(repo_path, "r") != 0)
4257 		return got_error_from_errno2("unveil", repo_path);
4258 
4259 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4260 		return got_error_from_errno2("unveil", worktree_path);
4261 
4262 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4263 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4264 
4265 	error = got_privsep_unveil_exec_helpers();
4266 	if (error != NULL)
4267 		return error;
4268 
4269 	if (unveil(NULL, NULL) != 0)
4270 		return got_error_from_errno("unveil");
4271 
4272 	return NULL;
4273 }
4274 
4275 static const struct got_error *
4276 init_mock_term(const char *test_script_path)
4277 {
4278 	const struct got_error	*err = NULL;
4279 	const char *screen_dump_path;
4280 	int in;
4281 
4282 	if (test_script_path == NULL || *test_script_path == '\0')
4283 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4284 
4285 	tog_io.f = fopen(test_script_path, "re");
4286 	if (tog_io.f == NULL) {
4287 		err = got_error_from_errno_fmt("fopen: %s",
4288 		    test_script_path);
4289 		goto done;
4290 	}
4291 
4292 	/* test mode, we don't want any output */
4293 	tog_io.cout = fopen("/dev/null", "w+");
4294 	if (tog_io.cout == NULL) {
4295 		err = got_error_from_errno2("fopen", "/dev/null");
4296 		goto done;
4297 	}
4298 
4299 	in = dup(fileno(tog_io.cout));
4300 	if (in == -1) {
4301 		err = got_error_from_errno("dup");
4302 		goto done;
4303 	}
4304 	tog_io.cin = fdopen(in, "r");
4305 	if (tog_io.cin == NULL) {
4306 		err = got_error_from_errno("fdopen");
4307 		close(in);
4308 		goto done;
4309 	}
4310 
4311 	screen_dump_path = getenv("TOG_SCR_DUMP");
4312 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4313 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4314 	tog_io.sdump = fopen(screen_dump_path, "we");
4315 	if (tog_io.sdump == NULL) {
4316 		err = got_error_from_errno2("fopen", screen_dump_path);
4317 		goto done;
4318 	}
4319 
4320 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4321 		err = got_error_from_errno("fseeko");
4322 		goto done;
4323 	}
4324 
4325 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4326 		err = got_error_msg(GOT_ERR_IO,
4327 		    "newterm: failed to initialise curses");
4328 
4329 	using_mock_io = 1;
4330 
4331 done:
4332 	if (err)
4333 		tog_io_close();
4334 	return err;
4335 }
4336 
4337 static void
4338 init_curses(void)
4339 {
4340 	/*
4341 	 * Override default signal handlers before starting ncurses.
4342 	 * This should prevent ncurses from installing its own
4343 	 * broken cleanup() signal handler.
4344 	 */
4345 	signal(SIGWINCH, tog_sigwinch);
4346 	signal(SIGPIPE, tog_sigpipe);
4347 	signal(SIGCONT, tog_sigcont);
4348 	signal(SIGINT, tog_sigint);
4349 	signal(SIGTERM, tog_sigterm);
4350 
4351 	if (using_mock_io) /* In test mode we use a fake terminal */
4352 		return;
4353 
4354 	initscr();
4355 
4356 	cbreak();
4357 	halfdelay(1); /* Fast refresh while initial view is loading. */
4358 	noecho();
4359 	nonl();
4360 	intrflush(stdscr, FALSE);
4361 	keypad(stdscr, TRUE);
4362 	curs_set(0);
4363 	if (getenv("TOG_COLORS") != NULL) {
4364 		start_color();
4365 		use_default_colors();
4366 	}
4367 
4368 	return;
4369 }
4370 
4371 static const struct got_error *
4372 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4373     struct got_repository *repo, struct got_worktree *worktree)
4374 {
4375 	const struct got_error *err = NULL;
4376 
4377 	if (argc == 0) {
4378 		*in_repo_path = strdup("/");
4379 		if (*in_repo_path == NULL)
4380 			return got_error_from_errno("strdup");
4381 		return NULL;
4382 	}
4383 
4384 	if (worktree) {
4385 		const char *prefix = got_worktree_get_path_prefix(worktree);
4386 		char *p;
4387 
4388 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4389 		if (err)
4390 			return err;
4391 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4392 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4393 		    p) == -1) {
4394 			err = got_error_from_errno("asprintf");
4395 			*in_repo_path = NULL;
4396 		}
4397 		free(p);
4398 	} else
4399 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4400 
4401 	return err;
4402 }
4403 
4404 static const struct got_error *
4405 cmd_log(int argc, char *argv[])
4406 {
4407 	const struct got_error *error;
4408 	struct got_repository *repo = NULL;
4409 	struct got_worktree *worktree = NULL;
4410 	struct got_object_id *start_id = NULL;
4411 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4412 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4413 	struct got_reference *ref = NULL;
4414 	const char *head_ref_name = NULL;
4415 	int ch, log_branches = 0;
4416 	struct tog_view *view;
4417 	int *pack_fds = NULL;
4418 
4419 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4420 		switch (ch) {
4421 		case 'b':
4422 			log_branches = 1;
4423 			break;
4424 		case 'c':
4425 			start_commit = optarg;
4426 			break;
4427 		case 'r':
4428 			repo_path = realpath(optarg, NULL);
4429 			if (repo_path == NULL)
4430 				return got_error_from_errno2("realpath",
4431 				    optarg);
4432 			break;
4433 		default:
4434 			usage_log();
4435 			/* NOTREACHED */
4436 		}
4437 	}
4438 
4439 	argc -= optind;
4440 	argv += optind;
4441 
4442 	if (argc > 1)
4443 		usage_log();
4444 
4445 	error = got_repo_pack_fds_open(&pack_fds);
4446 	if (error != NULL)
4447 		goto done;
4448 
4449 	if (repo_path == NULL) {
4450 		cwd = getcwd(NULL, 0);
4451 		if (cwd == NULL)
4452 			return got_error_from_errno("getcwd");
4453 		error = got_worktree_open(&worktree, cwd, NULL);
4454 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4455 			goto done;
4456 		if (worktree)
4457 			repo_path =
4458 			    strdup(got_worktree_get_repo_path(worktree));
4459 		else
4460 			repo_path = strdup(cwd);
4461 		if (repo_path == NULL) {
4462 			error = got_error_from_errno("strdup");
4463 			goto done;
4464 		}
4465 	}
4466 
4467 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4468 	if (error != NULL)
4469 		goto done;
4470 
4471 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4472 	    repo, worktree);
4473 	if (error)
4474 		goto done;
4475 
4476 	init_curses();
4477 
4478 	error = apply_unveil(got_repo_get_path(repo),
4479 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4480 	if (error)
4481 		goto done;
4482 
4483 	/* already loaded by tog_log_with_path()? */
4484 	if (TAILQ_EMPTY(&tog_refs)) {
4485 		error = tog_load_refs(repo, 0);
4486 		if (error)
4487 			goto done;
4488 	}
4489 
4490 	if (start_commit == NULL) {
4491 		error = got_repo_match_object_id(&start_id, &label,
4492 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4493 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4494 		if (error)
4495 			goto done;
4496 		head_ref_name = label;
4497 	} else {
4498 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4499 		    repo, worktree);
4500 		if (error != NULL)
4501 			goto done;
4502 		if (keyword_idstr != NULL)
4503 			start_commit = keyword_idstr;
4504 
4505 		error = got_ref_open(&ref, repo, start_commit, 0);
4506 		if (error == NULL)
4507 			head_ref_name = got_ref_get_name(ref);
4508 		else if (error->code != GOT_ERR_NOT_REF)
4509 			goto done;
4510 		error = got_repo_match_object_id(&start_id, NULL,
4511 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4512 		if (error)
4513 			goto done;
4514 	}
4515 
4516 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4517 	if (view == NULL) {
4518 		error = got_error_from_errno("view_open");
4519 		goto done;
4520 	}
4521 	error = open_log_view(view, start_id, repo, head_ref_name,
4522 	    in_repo_path, log_branches);
4523 	if (error)
4524 		goto done;
4525 	if (worktree) {
4526 		/* Release work tree lock. */
4527 		got_worktree_close(worktree);
4528 		worktree = NULL;
4529 	}
4530 	error = view_loop(view);
4531 done:
4532 	free(keyword_idstr);
4533 	free(in_repo_path);
4534 	free(repo_path);
4535 	free(cwd);
4536 	free(start_id);
4537 	free(label);
4538 	if (ref)
4539 		got_ref_close(ref);
4540 	if (repo) {
4541 		const struct got_error *close_err = got_repo_close(repo);
4542 		if (error == NULL)
4543 			error = close_err;
4544 	}
4545 	if (worktree)
4546 		got_worktree_close(worktree);
4547 	if (pack_fds) {
4548 		const struct got_error *pack_err =
4549 		    got_repo_pack_fds_close(pack_fds);
4550 		if (error == NULL)
4551 			error = pack_err;
4552 	}
4553 	tog_free_refs();
4554 	return error;
4555 }
4556 
4557 __dead static void
4558 usage_diff(void)
4559 {
4560 	endwin();
4561 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4562 	    "object1 object2\n", getprogname());
4563 	exit(1);
4564 }
4565 
4566 static int
4567 match_line(const char *line, regex_t *regex, size_t nmatch,
4568     regmatch_t *regmatch)
4569 {
4570 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4571 }
4572 
4573 static struct tog_color *
4574 match_color(struct tog_colors *colors, const char *line)
4575 {
4576 	struct tog_color *tc = NULL;
4577 
4578 	STAILQ_FOREACH(tc, colors, entry) {
4579 		if (match_line(line, &tc->regex, 0, NULL))
4580 			return tc;
4581 	}
4582 
4583 	return NULL;
4584 }
4585 
4586 static const struct got_error *
4587 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4588     WINDOW *window, int skipcol, regmatch_t *regmatch)
4589 {
4590 	const struct got_error *err = NULL;
4591 	char *exstr = NULL;
4592 	wchar_t *wline = NULL;
4593 	int rme, rms, n, width, scrollx;
4594 	int width0 = 0, width1 = 0, width2 = 0;
4595 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4596 
4597 	*wtotal = 0;
4598 
4599 	rms = regmatch->rm_so;
4600 	rme = regmatch->rm_eo;
4601 
4602 	err = expand_tab(&exstr, line);
4603 	if (err)
4604 		return err;
4605 
4606 	/* Split the line into 3 segments, according to match offsets. */
4607 	seg0 = strndup(exstr, rms);
4608 	if (seg0 == NULL) {
4609 		err = got_error_from_errno("strndup");
4610 		goto done;
4611 	}
4612 	seg1 = strndup(exstr + rms, rme - rms);
4613 	if (seg1 == NULL) {
4614 		err = got_error_from_errno("strndup");
4615 		goto done;
4616 	}
4617 	seg2 = strdup(exstr + rme);
4618 	if (seg2 == NULL) {
4619 		err = got_error_from_errno("strndup");
4620 		goto done;
4621 	}
4622 
4623 	/* draw up to matched token if we haven't scrolled past it */
4624 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4625 	    col_tab_align, 1);
4626 	if (err)
4627 		goto done;
4628 	n = MAX(width0 - skipcol, 0);
4629 	if (n) {
4630 		free(wline);
4631 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4632 		    wlimit, col_tab_align, 1);
4633 		if (err)
4634 			goto done;
4635 		waddwstr(window, &wline[scrollx]);
4636 		wlimit -= width;
4637 		*wtotal += width;
4638 	}
4639 
4640 	if (wlimit > 0) {
4641 		int i = 0, w = 0;
4642 		size_t wlen;
4643 
4644 		free(wline);
4645 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4646 		    col_tab_align, 1);
4647 		if (err)
4648 			goto done;
4649 		wlen = wcslen(wline);
4650 		while (i < wlen) {
4651 			width = wcwidth(wline[i]);
4652 			if (width == -1) {
4653 				/* should not happen, tabs are expanded */
4654 				err = got_error(GOT_ERR_RANGE);
4655 				goto done;
4656 			}
4657 			if (width0 + w + width > skipcol)
4658 				break;
4659 			w += width;
4660 			i++;
4661 		}
4662 		/* draw (visible part of) matched token (if scrolled into it) */
4663 		if (width1 - w > 0) {
4664 			wattron(window, A_STANDOUT);
4665 			waddwstr(window, &wline[i]);
4666 			wattroff(window, A_STANDOUT);
4667 			wlimit -= (width1 - w);
4668 			*wtotal += (width1 - w);
4669 		}
4670 	}
4671 
4672 	if (wlimit > 0) {  /* draw rest of line */
4673 		free(wline);
4674 		if (skipcol > width0 + width1) {
4675 			err = format_line(&wline, &width2, &scrollx, seg2,
4676 			    skipcol - (width0 + width1), wlimit,
4677 			    col_tab_align, 1);
4678 			if (err)
4679 				goto done;
4680 			waddwstr(window, &wline[scrollx]);
4681 		} else {
4682 			err = format_line(&wline, &width2, NULL, seg2, 0,
4683 			    wlimit, col_tab_align, 1);
4684 			if (err)
4685 				goto done;
4686 			waddwstr(window, wline);
4687 		}
4688 		*wtotal += width2;
4689 	}
4690 done:
4691 	free(wline);
4692 	free(exstr);
4693 	free(seg0);
4694 	free(seg1);
4695 	free(seg2);
4696 	return err;
4697 }
4698 
4699 static int
4700 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4701 {
4702 	FILE	*f = NULL;
4703 	int	*eof, *first, *selected;
4704 
4705 	if (view->type == TOG_VIEW_DIFF) {
4706 		struct tog_diff_view_state *s = &view->state.diff;
4707 
4708 		first = &s->first_displayed_line;
4709 		selected = first;
4710 		eof = &s->eof;
4711 		f = s->f;
4712 	} else if (view->type == TOG_VIEW_HELP) {
4713 		struct tog_help_view_state *s = &view->state.help;
4714 
4715 		first = &s->first_displayed_line;
4716 		selected = first;
4717 		eof = &s->eof;
4718 		f = s->f;
4719 	} else if (view->type == TOG_VIEW_BLAME) {
4720 		struct tog_blame_view_state *s = &view->state.blame;
4721 
4722 		first = &s->first_displayed_line;
4723 		selected = &s->selected_line;
4724 		eof = &s->eof;
4725 		f = s->blame.f;
4726 	} else
4727 		return 0;
4728 
4729 	/* Center gline in the middle of the page like vi(1). */
4730 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4731 		return 0;
4732 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4733 		rewind(f);
4734 		*eof = 0;
4735 		*first = 1;
4736 		*lineno = 0;
4737 		*nprinted = 0;
4738 		return 0;
4739 	}
4740 
4741 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4742 		view->gline : (view->nlines - 3) / 2 + 1;
4743 	view->gline = 0;
4744 
4745 	return 1;
4746 }
4747 
4748 static const struct got_error *
4749 draw_file(struct tog_view *view, const char *header)
4750 {
4751 	struct tog_diff_view_state *s = &view->state.diff;
4752 	regmatch_t *regmatch = &view->regmatch;
4753 	const struct got_error *err;
4754 	int nprinted = 0;
4755 	char *line;
4756 	size_t linesize = 0;
4757 	ssize_t linelen;
4758 	wchar_t *wline;
4759 	int width;
4760 	int max_lines = view->nlines;
4761 	int nlines = s->nlines;
4762 	off_t line_offset;
4763 
4764 	s->lineno = s->first_displayed_line - 1;
4765 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4766 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4767 		return got_error_from_errno("fseek");
4768 
4769 	werase(view->window);
4770 
4771 	if (view->gline > s->nlines - 1)
4772 		view->gline = s->nlines - 1;
4773 
4774 	if (header) {
4775 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4776 		    1 : view->gline - (view->nlines - 3) / 2 :
4777 		    s->lineno + s->selected_line;
4778 
4779 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4780 			return got_error_from_errno("asprintf");
4781 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4782 		    0, 0);
4783 		free(line);
4784 		if (err)
4785 			return err;
4786 
4787 		if (view_needs_focus_indication(view))
4788 			wstandout(view->window);
4789 		waddwstr(view->window, wline);
4790 		free(wline);
4791 		wline = NULL;
4792 		while (width++ < view->ncols)
4793 			waddch(view->window, ' ');
4794 		if (view_needs_focus_indication(view))
4795 			wstandend(view->window);
4796 
4797 		if (max_lines <= 1)
4798 			return NULL;
4799 		max_lines--;
4800 	}
4801 
4802 	s->eof = 0;
4803 	view->maxx = 0;
4804 	line = NULL;
4805 	while (max_lines > 0 && nprinted < max_lines) {
4806 		enum got_diff_line_type linetype;
4807 		attr_t attr = 0;
4808 
4809 		linelen = getline(&line, &linesize, s->f);
4810 		if (linelen == -1) {
4811 			if (feof(s->f)) {
4812 				s->eof = 1;
4813 				break;
4814 			}
4815 			free(line);
4816 			return got_ferror(s->f, GOT_ERR_IO);
4817 		}
4818 
4819 		if (++s->lineno < s->first_displayed_line)
4820 			continue;
4821 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4822 			continue;
4823 		if (s->lineno == view->hiline)
4824 			attr = A_STANDOUT;
4825 
4826 		/* Set view->maxx based on full line length. */
4827 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4828 		    view->x ? 1 : 0);
4829 		if (err) {
4830 			free(line);
4831 			return err;
4832 		}
4833 		view->maxx = MAX(view->maxx, width);
4834 		free(wline);
4835 		wline = NULL;
4836 
4837 		linetype = s->lines[s->lineno].type;
4838 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4839 		    linetype < GOT_DIFF_LINE_CONTEXT)
4840 			attr |= COLOR_PAIR(linetype);
4841 		if (attr)
4842 			wattron(view->window, attr);
4843 		if (s->first_displayed_line + nprinted == s->matched_line &&
4844 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4845 			err = add_matched_line(&width, line, view->ncols, 0,
4846 			    view->window, view->x, regmatch);
4847 			if (err) {
4848 				free(line);
4849 				return err;
4850 			}
4851 		} else {
4852 			int skip;
4853 			err = format_line(&wline, &width, &skip, line,
4854 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4855 			if (err) {
4856 				free(line);
4857 				return err;
4858 			}
4859 			waddwstr(view->window, &wline[skip]);
4860 			free(wline);
4861 			wline = NULL;
4862 		}
4863 		if (s->lineno == view->hiline) {
4864 			/* highlight full gline length */
4865 			while (width++ < view->ncols)
4866 				waddch(view->window, ' ');
4867 		} else {
4868 			if (width <= view->ncols - 1)
4869 				waddch(view->window, '\n');
4870 		}
4871 		if (attr)
4872 			wattroff(view->window, attr);
4873 		if (++nprinted == 1)
4874 			s->first_displayed_line = s->lineno;
4875 	}
4876 	free(line);
4877 	if (nprinted >= 1)
4878 		s->last_displayed_line = s->first_displayed_line +
4879 		    (nprinted - 1);
4880 	else
4881 		s->last_displayed_line = s->first_displayed_line;
4882 
4883 	view_border(view);
4884 
4885 	if (s->eof) {
4886 		while (nprinted < view->nlines) {
4887 			waddch(view->window, '\n');
4888 			nprinted++;
4889 		}
4890 
4891 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4892 		    view->ncols, 0, 0);
4893 		if (err) {
4894 			return err;
4895 		}
4896 
4897 		wstandout(view->window);
4898 		waddwstr(view->window, wline);
4899 		free(wline);
4900 		wline = NULL;
4901 		wstandend(view->window);
4902 	}
4903 
4904 	return NULL;
4905 }
4906 
4907 static char *
4908 get_datestr(time_t *time, char *datebuf)
4909 {
4910 	struct tm mytm, *tm;
4911 	char *p, *s;
4912 
4913 	tm = gmtime_r(time, &mytm);
4914 	if (tm == NULL)
4915 		return NULL;
4916 	s = asctime_r(tm, datebuf);
4917 	if (s == NULL)
4918 		return NULL;
4919 	p = strchr(s, '\n');
4920 	if (p)
4921 		*p = '\0';
4922 	return s;
4923 }
4924 
4925 static const struct got_error *
4926 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4927     off_t off, uint8_t type)
4928 {
4929 	struct got_diff_line *p;
4930 
4931 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4932 	if (p == NULL)
4933 		return got_error_from_errno("reallocarray");
4934 	*lines = p;
4935 	(*lines)[*nlines].offset = off;
4936 	(*lines)[*nlines].type = type;
4937 	(*nlines)++;
4938 
4939 	return NULL;
4940 }
4941 
4942 static const struct got_error *
4943 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4944     struct got_diff_line *s_lines, size_t s_nlines)
4945 {
4946 	struct got_diff_line	*p;
4947 	char			 buf[BUFSIZ];
4948 	size_t			 i, r;
4949 
4950 	if (fseeko(src, 0L, SEEK_SET) == -1)
4951 		return got_error_from_errno("fseeko");
4952 
4953 	for (;;) {
4954 		r = fread(buf, 1, sizeof(buf), src);
4955 		if (r == 0) {
4956 			if (ferror(src))
4957 				return got_error_from_errno("fread");
4958 			if (feof(src))
4959 				break;
4960 		}
4961 		if (fwrite(buf, 1, r, dst) != r)
4962 			return got_ferror(dst, GOT_ERR_IO);
4963 	}
4964 
4965 	if (s_nlines == 0 && *d_nlines == 0)
4966 		return NULL;
4967 
4968 	/*
4969 	 * If commit info was in dst, increment line offsets
4970 	 * of the appended diff content, but skip s_lines[0]
4971 	 * because offset zero is already in *d_lines.
4972 	 */
4973 	if (*d_nlines > 0) {
4974 		for (i = 1; i < s_nlines; ++i)
4975 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4976 
4977 		if (s_nlines > 0) {
4978 			--s_nlines;
4979 			++s_lines;
4980 		}
4981 	}
4982 
4983 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4984 	if (p == NULL) {
4985 		/* d_lines is freed in close_diff_view() */
4986 		return got_error_from_errno("reallocarray");
4987 	}
4988 
4989 	*d_lines = p;
4990 
4991 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4992 	*d_nlines += s_nlines;
4993 
4994 	return NULL;
4995 }
4996 
4997 static const struct got_error *
4998 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4999     struct got_object_id *commit_id, struct got_reflist_head *refs,
5000     struct got_repository *repo, int ignore_ws, int force_text_diff,
5001     struct got_diffstat_cb_arg *dsa, FILE *outfile)
5002 {
5003 	const struct got_error *err = NULL;
5004 	char datebuf[26], *datestr;
5005 	struct got_commit_object *commit;
5006 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5007 	time_t committer_time;
5008 	const char *author, *committer;
5009 	char *refs_str = NULL;
5010 	struct got_pathlist_entry *pe;
5011 	off_t outoff = 0;
5012 	int n;
5013 
5014 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5015 	if (err)
5016 		return err;
5017 
5018 	err = got_object_open_as_commit(&commit, repo, commit_id);
5019 	if (err)
5020 		return err;
5021 
5022 	err = got_object_id_str(&id_str, commit_id);
5023 	if (err) {
5024 		err = got_error_from_errno("got_object_id_str");
5025 		goto done;
5026 	}
5027 
5028 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5029 	if (err)
5030 		goto done;
5031 
5032 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5033 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5034 	if (n < 0) {
5035 		err = got_error_from_errno("fprintf");
5036 		goto done;
5037 	}
5038 	outoff += n;
5039 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5040 	if (err)
5041 		goto done;
5042 
5043 	n = fprintf(outfile, "from: %s\n",
5044 	    got_object_commit_get_author(commit));
5045 	if (n < 0) {
5046 		err = got_error_from_errno("fprintf");
5047 		goto done;
5048 	}
5049 	outoff += n;
5050 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5051 	if (err)
5052 		goto done;
5053 
5054 	author = got_object_commit_get_author(commit);
5055 	committer = got_object_commit_get_committer(commit);
5056 	if (strcmp(author, committer) != 0) {
5057 		n = fprintf(outfile, "via: %s\n", committer);
5058 		if (n < 0) {
5059 			err = got_error_from_errno("fprintf");
5060 			goto done;
5061 		}
5062 		outoff += n;
5063 		err = add_line_metadata(lines, nlines, outoff,
5064 		    GOT_DIFF_LINE_AUTHOR);
5065 		if (err)
5066 			goto done;
5067 	}
5068 	committer_time = got_object_commit_get_committer_time(commit);
5069 	datestr = get_datestr(&committer_time, datebuf);
5070 	if (datestr) {
5071 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5072 		if (n < 0) {
5073 			err = got_error_from_errno("fprintf");
5074 			goto done;
5075 		}
5076 		outoff += n;
5077 		err = add_line_metadata(lines, nlines, outoff,
5078 		    GOT_DIFF_LINE_DATE);
5079 		if (err)
5080 			goto done;
5081 	}
5082 	if (got_object_commit_get_nparents(commit) > 1) {
5083 		const struct got_object_id_queue *parent_ids;
5084 		struct got_object_qid *qid;
5085 		int pn = 1;
5086 		parent_ids = got_object_commit_get_parent_ids(commit);
5087 		STAILQ_FOREACH(qid, parent_ids, entry) {
5088 			err = got_object_id_str(&id_str, &qid->id);
5089 			if (err)
5090 				goto done;
5091 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5092 			if (n < 0) {
5093 				err = got_error_from_errno("fprintf");
5094 				goto done;
5095 			}
5096 			outoff += n;
5097 			err = add_line_metadata(lines, nlines, outoff,
5098 			    GOT_DIFF_LINE_META);
5099 			if (err)
5100 				goto done;
5101 			free(id_str);
5102 			id_str = NULL;
5103 		}
5104 	}
5105 
5106 	err = got_object_commit_get_logmsg(&logmsg, commit);
5107 	if (err)
5108 		goto done;
5109 	s = logmsg;
5110 	while ((line = strsep(&s, "\n")) != NULL) {
5111 		n = fprintf(outfile, "%s\n", line);
5112 		if (n < 0) {
5113 			err = got_error_from_errno("fprintf");
5114 			goto done;
5115 		}
5116 		outoff += n;
5117 		err = add_line_metadata(lines, nlines, outoff,
5118 		    GOT_DIFF_LINE_LOGMSG);
5119 		if (err)
5120 			goto done;
5121 	}
5122 
5123 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5124 		struct got_diff_changed_path *cp = pe->data;
5125 		int pad = dsa->max_path_len - pe->path_len + 1;
5126 
5127 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5128 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5129 		    dsa->rm_cols + 1, cp->rm);
5130 		if (n < 0) {
5131 			err = got_error_from_errno("fprintf");
5132 			goto done;
5133 		}
5134 		outoff += n;
5135 		err = add_line_metadata(lines, nlines, outoff,
5136 		    GOT_DIFF_LINE_CHANGES);
5137 		if (err)
5138 			goto done;
5139 	}
5140 
5141 	fputc('\n', outfile);
5142 	outoff++;
5143 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5144 	if (err)
5145 		goto done;
5146 
5147 	n = fprintf(outfile,
5148 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5149 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5150 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5151 	if (n < 0) {
5152 		err = got_error_from_errno("fprintf");
5153 		goto done;
5154 	}
5155 	outoff += n;
5156 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5157 	if (err)
5158 		goto done;
5159 
5160 	fputc('\n', outfile);
5161 	outoff++;
5162 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5163 done:
5164 	free(id_str);
5165 	free(logmsg);
5166 	free(refs_str);
5167 	got_object_commit_close(commit);
5168 	if (err) {
5169 		free(*lines);
5170 		*lines = NULL;
5171 		*nlines = 0;
5172 	}
5173 	return err;
5174 }
5175 
5176 static const struct got_error *
5177 create_diff(struct tog_diff_view_state *s)
5178 {
5179 	const struct got_error *err = NULL;
5180 	FILE *f = NULL, *tmp_diff_file = NULL;
5181 	int obj_type;
5182 	struct got_diff_line *lines = NULL;
5183 	struct got_pathlist_head changed_paths;
5184 
5185 	TAILQ_INIT(&changed_paths);
5186 
5187 	free(s->lines);
5188 	s->lines = malloc(sizeof(*s->lines));
5189 	if (s->lines == NULL)
5190 		return got_error_from_errno("malloc");
5191 	s->nlines = 0;
5192 
5193 	f = got_opentemp();
5194 	if (f == NULL) {
5195 		err = got_error_from_errno("got_opentemp");
5196 		goto done;
5197 	}
5198 	tmp_diff_file = got_opentemp();
5199 	if (tmp_diff_file == NULL) {
5200 		err = got_error_from_errno("got_opentemp");
5201 		goto done;
5202 	}
5203 	if (s->f && fclose(s->f) == EOF) {
5204 		err = got_error_from_errno("fclose");
5205 		goto done;
5206 	}
5207 	s->f = f;
5208 
5209 	if (s->id1)
5210 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5211 	else
5212 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5213 	if (err)
5214 		goto done;
5215 
5216 	switch (obj_type) {
5217 	case GOT_OBJ_TYPE_BLOB:
5218 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5219 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5220 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5221 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5222 		    s->f);
5223 		break;
5224 	case GOT_OBJ_TYPE_TREE:
5225 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5226 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5227 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5228 		    s->force_text_diff, NULL, s->repo, s->f);
5229 		break;
5230 	case GOT_OBJ_TYPE_COMMIT: {
5231 		const struct got_object_id_queue *parent_ids;
5232 		struct got_object_qid *pid;
5233 		struct got_commit_object *commit2;
5234 		struct got_reflist_head *refs;
5235 		size_t nlines = 0;
5236 		struct got_diffstat_cb_arg dsa = {
5237 			0, 0, 0, 0, 0, 0,
5238 			&changed_paths,
5239 			s->ignore_whitespace,
5240 			s->force_text_diff,
5241 			tog_diff_algo
5242 		};
5243 
5244 		lines = malloc(sizeof(*lines));
5245 		if (lines == NULL) {
5246 			err = got_error_from_errno("malloc");
5247 			goto done;
5248 		}
5249 
5250 		/* build diff first in tmp file then append to commit info */
5251 		err = got_diff_objects_as_commits(&lines, &nlines,
5252 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5253 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5254 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5255 		if (err)
5256 			break;
5257 
5258 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5259 		if (err)
5260 			goto done;
5261 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5262 		/* Show commit info if we're diffing to a parent/root commit. */
5263 		if (s->id1 == NULL) {
5264 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5265 			    refs, s->repo, s->ignore_whitespace,
5266 			    s->force_text_diff, &dsa, s->f);
5267 			if (err)
5268 				goto done;
5269 		} else {
5270 			parent_ids = got_object_commit_get_parent_ids(commit2);
5271 			STAILQ_FOREACH(pid, parent_ids, entry) {
5272 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5273 					err = write_commit_info(&s->lines,
5274 					    &s->nlines, s->id2, refs, s->repo,
5275 					    s->ignore_whitespace,
5276 					    s->force_text_diff, &dsa, s->f);
5277 					if (err)
5278 						goto done;
5279 					break;
5280 				}
5281 			}
5282 		}
5283 		got_object_commit_close(commit2);
5284 
5285 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5286 		    lines, nlines);
5287 		break;
5288 	}
5289 	default:
5290 		err = got_error(GOT_ERR_OBJ_TYPE);
5291 		break;
5292 	}
5293 done:
5294 	free(lines);
5295 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5296 	if (s->f && fflush(s->f) != 0 && err == NULL)
5297 		err = got_error_from_errno("fflush");
5298 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5299 		err = got_error_from_errno("fclose");
5300 	return err;
5301 }
5302 
5303 static void
5304 diff_view_indicate_progress(struct tog_view *view)
5305 {
5306 	mvwaddstr(view->window, 0, 0, "diffing...");
5307 	update_panels();
5308 	doupdate();
5309 }
5310 
5311 static const struct got_error *
5312 search_start_diff_view(struct tog_view *view)
5313 {
5314 	struct tog_diff_view_state *s = &view->state.diff;
5315 
5316 	s->matched_line = 0;
5317 	return NULL;
5318 }
5319 
5320 static void
5321 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5322     size_t *nlines, int **first, int **last, int **match, int **selected)
5323 {
5324 	struct tog_diff_view_state *s = &view->state.diff;
5325 
5326 	*f = s->f;
5327 	*nlines = s->nlines;
5328 	*line_offsets = NULL;
5329 	*match = &s->matched_line;
5330 	*first = &s->first_displayed_line;
5331 	*last = &s->last_displayed_line;
5332 	*selected = &s->selected_line;
5333 }
5334 
5335 static const struct got_error *
5336 search_next_view_match(struct tog_view *view)
5337 {
5338 	const struct got_error *err = NULL;
5339 	FILE *f;
5340 	int lineno;
5341 	char *line = NULL;
5342 	size_t linesize = 0;
5343 	ssize_t linelen;
5344 	off_t *line_offsets;
5345 	size_t nlines = 0;
5346 	int *first, *last, *match, *selected;
5347 
5348 	if (!view->search_setup)
5349 		return got_error_msg(GOT_ERR_NOT_IMPL,
5350 		    "view search not supported");
5351 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5352 	    &match, &selected);
5353 
5354 	if (!view->searching) {
5355 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5356 		return NULL;
5357 	}
5358 
5359 	if (*match) {
5360 		if (view->searching == TOG_SEARCH_FORWARD)
5361 			lineno = *first + 1;
5362 		else
5363 			lineno = *first - 1;
5364 	} else
5365 		lineno = *first - 1 + *selected;
5366 
5367 	while (1) {
5368 		off_t offset;
5369 
5370 		if (lineno <= 0 || lineno > nlines) {
5371 			if (*match == 0) {
5372 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5373 				break;
5374 			}
5375 
5376 			if (view->searching == TOG_SEARCH_FORWARD)
5377 				lineno = 1;
5378 			else
5379 				lineno = nlines;
5380 		}
5381 
5382 		offset = view->type == TOG_VIEW_DIFF ?
5383 		    view->state.diff.lines[lineno - 1].offset :
5384 		    line_offsets[lineno - 1];
5385 		if (fseeko(f, offset, SEEK_SET) != 0) {
5386 			free(line);
5387 			return got_error_from_errno("fseeko");
5388 		}
5389 		linelen = getline(&line, &linesize, f);
5390 		if (linelen != -1) {
5391 			char *exstr;
5392 			err = expand_tab(&exstr, line);
5393 			if (err)
5394 				break;
5395 			if (match_line(exstr, &view->regex, 1,
5396 			    &view->regmatch)) {
5397 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5398 				*match = lineno;
5399 				free(exstr);
5400 				break;
5401 			}
5402 			free(exstr);
5403 		}
5404 		if (view->searching == TOG_SEARCH_FORWARD)
5405 			lineno++;
5406 		else
5407 			lineno--;
5408 	}
5409 	free(line);
5410 
5411 	if (*match) {
5412 		*first = *match;
5413 		*selected = 1;
5414 	}
5415 
5416 	return err;
5417 }
5418 
5419 static const struct got_error *
5420 close_diff_view(struct tog_view *view)
5421 {
5422 	const struct got_error *err = NULL;
5423 	struct tog_diff_view_state *s = &view->state.diff;
5424 
5425 	free(s->id1);
5426 	s->id1 = NULL;
5427 	free(s->id2);
5428 	s->id2 = NULL;
5429 	if (s->f && fclose(s->f) == EOF)
5430 		err = got_error_from_errno("fclose");
5431 	s->f = NULL;
5432 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5433 		err = got_error_from_errno("fclose");
5434 	s->f1 = NULL;
5435 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5436 		err = got_error_from_errno("fclose");
5437 	s->f2 = NULL;
5438 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5439 		err = got_error_from_errno("close");
5440 	s->fd1 = -1;
5441 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5442 		err = got_error_from_errno("close");
5443 	s->fd2 = -1;
5444 	free(s->lines);
5445 	s->lines = NULL;
5446 	s->nlines = 0;
5447 	return err;
5448 }
5449 
5450 static const struct got_error *
5451 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5452     struct got_object_id *id2, const char *label1, const char *label2,
5453     int diff_context, int ignore_whitespace, int force_text_diff,
5454     struct tog_view *parent_view, struct got_repository *repo)
5455 {
5456 	const struct got_error *err;
5457 	struct tog_diff_view_state *s = &view->state.diff;
5458 
5459 	memset(s, 0, sizeof(*s));
5460 	s->fd1 = -1;
5461 	s->fd2 = -1;
5462 
5463 	if (id1 != NULL && id2 != NULL) {
5464 		int type1, type2;
5465 
5466 		err = got_object_get_type(&type1, repo, id1);
5467 		if (err)
5468 			goto done;
5469 		err = got_object_get_type(&type2, repo, id2);
5470 		if (err)
5471 			goto done;
5472 
5473 		if (type1 != type2) {
5474 			err = got_error(GOT_ERR_OBJ_TYPE);
5475 			goto done;
5476 		}
5477 	}
5478 	s->first_displayed_line = 1;
5479 	s->last_displayed_line = view->nlines;
5480 	s->selected_line = 1;
5481 	s->repo = repo;
5482 	s->id1 = id1;
5483 	s->id2 = id2;
5484 	s->label1 = label1;
5485 	s->label2 = label2;
5486 
5487 	if (id1) {
5488 		s->id1 = got_object_id_dup(id1);
5489 		if (s->id1 == NULL) {
5490 			err = got_error_from_errno("got_object_id_dup");
5491 			goto done;
5492 		}
5493 	} else
5494 		s->id1 = NULL;
5495 
5496 	s->id2 = got_object_id_dup(id2);
5497 	if (s->id2 == NULL) {
5498 		err = got_error_from_errno("got_object_id_dup");
5499 		goto done;
5500 	}
5501 
5502 	s->f1 = got_opentemp();
5503 	if (s->f1 == NULL) {
5504 		err = got_error_from_errno("got_opentemp");
5505 		goto done;
5506 	}
5507 
5508 	s->f2 = got_opentemp();
5509 	if (s->f2 == NULL) {
5510 		err = got_error_from_errno("got_opentemp");
5511 		goto done;
5512 	}
5513 
5514 	s->fd1 = got_opentempfd();
5515 	if (s->fd1 == -1) {
5516 		err = got_error_from_errno("got_opentempfd");
5517 		goto done;
5518 	}
5519 
5520 	s->fd2 = got_opentempfd();
5521 	if (s->fd2 == -1) {
5522 		err = got_error_from_errno("got_opentempfd");
5523 		goto done;
5524 	}
5525 
5526 	s->diff_context = diff_context;
5527 	s->ignore_whitespace = ignore_whitespace;
5528 	s->force_text_diff = force_text_diff;
5529 	s->parent_view = parent_view;
5530 	s->repo = repo;
5531 
5532 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5533 		int rc;
5534 
5535 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5536 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5537 		if (rc != ERR)
5538 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5539 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5540 		if (rc != ERR)
5541 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5542 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5543 		if (rc != ERR)
5544 			rc = init_pair(GOT_DIFF_LINE_META,
5545 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5546 		if (rc != ERR)
5547 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5548 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5549 		if (rc != ERR)
5550 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5551 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5552 		if (rc != ERR)
5553 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5554 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5555 		if (rc != ERR)
5556 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5557 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5558 		if (rc != ERR)
5559 			rc = init_pair(GOT_DIFF_LINE_DATE,
5560 			    get_color_value("TOG_COLOR_DATE"), -1);
5561 		if (rc == ERR) {
5562 			err = got_error(GOT_ERR_RANGE);
5563 			goto done;
5564 		}
5565 	}
5566 
5567 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5568 	    view_is_splitscreen(view))
5569 		show_log_view(parent_view); /* draw border */
5570 	diff_view_indicate_progress(view);
5571 
5572 	err = create_diff(s);
5573 
5574 	view->show = show_diff_view;
5575 	view->input = input_diff_view;
5576 	view->reset = reset_diff_view;
5577 	view->close = close_diff_view;
5578 	view->search_start = search_start_diff_view;
5579 	view->search_setup = search_setup_diff_view;
5580 	view->search_next = search_next_view_match;
5581 done:
5582 	if (err) {
5583 		if (view->close == NULL)
5584 			close_diff_view(view);
5585 		view_close(view);
5586 	}
5587 	return err;
5588 }
5589 
5590 static const struct got_error *
5591 show_diff_view(struct tog_view *view)
5592 {
5593 	const struct got_error *err;
5594 	struct tog_diff_view_state *s = &view->state.diff;
5595 	char *id_str1 = NULL, *id_str2, *header;
5596 	const char *label1, *label2;
5597 
5598 	if (s->id1) {
5599 		err = got_object_id_str(&id_str1, s->id1);
5600 		if (err)
5601 			return err;
5602 		label1 = s->label1 ? s->label1 : id_str1;
5603 	} else
5604 		label1 = "/dev/null";
5605 
5606 	err = got_object_id_str(&id_str2, s->id2);
5607 	if (err)
5608 		return err;
5609 	label2 = s->label2 ? s->label2 : id_str2;
5610 
5611 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5612 		err = got_error_from_errno("asprintf");
5613 		free(id_str1);
5614 		free(id_str2);
5615 		return err;
5616 	}
5617 	free(id_str1);
5618 	free(id_str2);
5619 
5620 	err = draw_file(view, header);
5621 	free(header);
5622 	return err;
5623 }
5624 
5625 static const struct got_error *
5626 set_selected_commit(struct tog_diff_view_state *s,
5627     struct commit_queue_entry *entry)
5628 {
5629 	const struct got_error *err;
5630 	const struct got_object_id_queue *parent_ids;
5631 	struct got_commit_object *selected_commit;
5632 	struct got_object_qid *pid;
5633 
5634 	free(s->id2);
5635 	s->id2 = got_object_id_dup(entry->id);
5636 	if (s->id2 == NULL)
5637 		return got_error_from_errno("got_object_id_dup");
5638 
5639 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5640 	if (err)
5641 		return err;
5642 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5643 	free(s->id1);
5644 	pid = STAILQ_FIRST(parent_ids);
5645 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5646 	got_object_commit_close(selected_commit);
5647 	return NULL;
5648 }
5649 
5650 static const struct got_error *
5651 reset_diff_view(struct tog_view *view)
5652 {
5653 	struct tog_diff_view_state *s = &view->state.diff;
5654 
5655 	view->count = 0;
5656 	wclear(view->window);
5657 	s->first_displayed_line = 1;
5658 	s->last_displayed_line = view->nlines;
5659 	s->matched_line = 0;
5660 	diff_view_indicate_progress(view);
5661 	return create_diff(s);
5662 }
5663 
5664 static void
5665 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5666 {
5667 	int start, i;
5668 
5669 	i = start = s->first_displayed_line - 1;
5670 
5671 	while (s->lines[i].type != type) {
5672 		if (i == 0)
5673 			i = s->nlines - 1;
5674 		if (--i == start)
5675 			return; /* do nothing, requested type not in file */
5676 	}
5677 
5678 	s->selected_line = 1;
5679 	s->first_displayed_line = i;
5680 }
5681 
5682 static void
5683 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5684 {
5685 	int start, i;
5686 
5687 	i = start = s->first_displayed_line + 1;
5688 
5689 	while (s->lines[i].type != type) {
5690 		if (i == s->nlines - 1)
5691 			i = 0;
5692 		if (++i == start)
5693 			return; /* do nothing, requested type not in file */
5694 	}
5695 
5696 	s->selected_line = 1;
5697 	s->first_displayed_line = i;
5698 }
5699 
5700 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5701     int, int, int);
5702 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5703     int, int);
5704 
5705 static const struct got_error *
5706 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5707 {
5708 	const struct got_error *err = NULL;
5709 	struct tog_diff_view_state *s = &view->state.diff;
5710 	struct tog_log_view_state *ls;
5711 	struct commit_queue_entry *old_selected_entry;
5712 	char *line = NULL;
5713 	size_t linesize = 0;
5714 	ssize_t linelen;
5715 	int i, nscroll = view->nlines - 1, up = 0;
5716 
5717 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5718 
5719 	switch (ch) {
5720 	case '0':
5721 	case '$':
5722 	case KEY_RIGHT:
5723 	case 'l':
5724 	case KEY_LEFT:
5725 	case 'h':
5726 		horizontal_scroll_input(view, ch);
5727 		break;
5728 	case 'a':
5729 	case 'w':
5730 		if (ch == 'a') {
5731 			s->force_text_diff = !s->force_text_diff;
5732 			view->action = s->force_text_diff ?
5733 			    "force ASCII text enabled" :
5734 			    "force ASCII text disabled";
5735 		}
5736 		else if (ch == 'w') {
5737 			s->ignore_whitespace = !s->ignore_whitespace;
5738 			view->action = s->ignore_whitespace ?
5739 			    "ignore whitespace enabled" :
5740 			    "ignore whitespace disabled";
5741 		}
5742 		err = reset_diff_view(view);
5743 		break;
5744 	case 'g':
5745 	case KEY_HOME:
5746 		s->first_displayed_line = 1;
5747 		view->count = 0;
5748 		break;
5749 	case 'G':
5750 	case KEY_END:
5751 		view->count = 0;
5752 		if (s->eof)
5753 			break;
5754 
5755 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5756 		s->eof = 1;
5757 		break;
5758 	case 'k':
5759 	case KEY_UP:
5760 	case CTRL('p'):
5761 		if (s->first_displayed_line > 1)
5762 			s->first_displayed_line--;
5763 		else
5764 			view->count = 0;
5765 		break;
5766 	case CTRL('u'):
5767 	case 'u':
5768 		nscroll /= 2;
5769 		/* FALL THROUGH */
5770 	case KEY_PPAGE:
5771 	case CTRL('b'):
5772 	case 'b':
5773 		if (s->first_displayed_line == 1) {
5774 			view->count = 0;
5775 			break;
5776 		}
5777 		i = 0;
5778 		while (i++ < nscroll && s->first_displayed_line > 1)
5779 			s->first_displayed_line--;
5780 		break;
5781 	case 'j':
5782 	case KEY_DOWN:
5783 	case CTRL('n'):
5784 		if (!s->eof)
5785 			s->first_displayed_line++;
5786 		else
5787 			view->count = 0;
5788 		break;
5789 	case CTRL('d'):
5790 	case 'd':
5791 		nscroll /= 2;
5792 		/* FALL THROUGH */
5793 	case KEY_NPAGE:
5794 	case CTRL('f'):
5795 	case 'f':
5796 	case ' ':
5797 		if (s->eof) {
5798 			view->count = 0;
5799 			break;
5800 		}
5801 		i = 0;
5802 		while (!s->eof && i++ < nscroll) {
5803 			linelen = getline(&line, &linesize, s->f);
5804 			s->first_displayed_line++;
5805 			if (linelen == -1) {
5806 				if (feof(s->f)) {
5807 					s->eof = 1;
5808 				} else
5809 					err = got_ferror(s->f, GOT_ERR_IO);
5810 				break;
5811 			}
5812 		}
5813 		free(line);
5814 		break;
5815 	case '(':
5816 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5817 		break;
5818 	case ')':
5819 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5820 		break;
5821 	case '{':
5822 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5823 		break;
5824 	case '}':
5825 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5826 		break;
5827 	case '[':
5828 		if (s->diff_context > 0) {
5829 			s->diff_context--;
5830 			s->matched_line = 0;
5831 			diff_view_indicate_progress(view);
5832 			err = create_diff(s);
5833 			if (s->first_displayed_line + view->nlines - 1 >
5834 			    s->nlines) {
5835 				s->first_displayed_line = 1;
5836 				s->last_displayed_line = view->nlines;
5837 			}
5838 		} else
5839 			view->count = 0;
5840 		break;
5841 	case ']':
5842 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5843 			s->diff_context++;
5844 			s->matched_line = 0;
5845 			diff_view_indicate_progress(view);
5846 			err = create_diff(s);
5847 		} else
5848 			view->count = 0;
5849 		break;
5850 	case '<':
5851 	case ',':
5852 	case 'K':
5853 		up = 1;
5854 		/* FALL THROUGH */
5855 	case '>':
5856 	case '.':
5857 	case 'J':
5858 		if (s->parent_view == NULL) {
5859 			view->count = 0;
5860 			break;
5861 		}
5862 		s->parent_view->count = view->count;
5863 
5864 		if (s->parent_view->type == TOG_VIEW_LOG) {
5865 			ls = &s->parent_view->state.log;
5866 			old_selected_entry = ls->selected_entry;
5867 
5868 			err = input_log_view(NULL, s->parent_view,
5869 			    up ? KEY_UP : KEY_DOWN);
5870 			if (err)
5871 				break;
5872 			view->count = s->parent_view->count;
5873 
5874 			if (old_selected_entry == ls->selected_entry)
5875 				break;
5876 
5877 			err = set_selected_commit(s, ls->selected_entry);
5878 			if (err)
5879 				break;
5880 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5881 			struct tog_blame_view_state *bs;
5882 			struct got_object_id *id, *prev_id;
5883 
5884 			bs = &s->parent_view->state.blame;
5885 			prev_id = get_annotation_for_line(bs->blame.lines,
5886 			    bs->blame.nlines, bs->last_diffed_line);
5887 
5888 			err = input_blame_view(&view, s->parent_view,
5889 			    up ? KEY_UP : KEY_DOWN);
5890 			if (err)
5891 				break;
5892 			view->count = s->parent_view->count;
5893 
5894 			if (prev_id == NULL)
5895 				break;
5896 			id = get_selected_commit_id(bs->blame.lines,
5897 			    bs->blame.nlines, bs->first_displayed_line,
5898 			    bs->selected_line);
5899 			if (id == NULL)
5900 				break;
5901 
5902 			if (!got_object_id_cmp(prev_id, id))
5903 				break;
5904 
5905 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5906 			if (err)
5907 				break;
5908 		}
5909 		s->first_displayed_line = 1;
5910 		s->last_displayed_line = view->nlines;
5911 		s->matched_line = 0;
5912 		view->x = 0;
5913 
5914 		diff_view_indicate_progress(view);
5915 		err = create_diff(s);
5916 		break;
5917 	default:
5918 		view->count = 0;
5919 		break;
5920 	}
5921 
5922 	return err;
5923 }
5924 
5925 static const struct got_error *
5926 cmd_diff(int argc, char *argv[])
5927 {
5928 	const struct got_error *error;
5929 	struct got_repository *repo = NULL;
5930 	struct got_worktree *worktree = NULL;
5931 	struct got_object_id *id1 = NULL, *id2 = NULL;
5932 	char *repo_path = NULL, *cwd = NULL;
5933 	char *id_str1 = NULL, *id_str2 = NULL;
5934 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
5935 	char *label1 = NULL, *label2 = NULL;
5936 	int diff_context = 3, ignore_whitespace = 0;
5937 	int ch, force_text_diff = 0;
5938 	const char *errstr;
5939 	struct tog_view *view;
5940 	int *pack_fds = NULL;
5941 
5942 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5943 		switch (ch) {
5944 		case 'a':
5945 			force_text_diff = 1;
5946 			break;
5947 		case 'C':
5948 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5949 			    &errstr);
5950 			if (errstr != NULL)
5951 				errx(1, "number of context lines is %s: %s",
5952 				    errstr, errstr);
5953 			break;
5954 		case 'r':
5955 			repo_path = realpath(optarg, NULL);
5956 			if (repo_path == NULL)
5957 				return got_error_from_errno2("realpath",
5958 				    optarg);
5959 			got_path_strip_trailing_slashes(repo_path);
5960 			break;
5961 		case 'w':
5962 			ignore_whitespace = 1;
5963 			break;
5964 		default:
5965 			usage_diff();
5966 			/* NOTREACHED */
5967 		}
5968 	}
5969 
5970 	argc -= optind;
5971 	argv += optind;
5972 
5973 	if (argc == 0) {
5974 		usage_diff(); /* TODO show local worktree changes */
5975 	} else if (argc == 2) {
5976 		id_str1 = argv[0];
5977 		id_str2 = argv[1];
5978 	} else
5979 		usage_diff();
5980 
5981 	error = got_repo_pack_fds_open(&pack_fds);
5982 	if (error)
5983 		goto done;
5984 
5985 	if (repo_path == NULL) {
5986 		cwd = getcwd(NULL, 0);
5987 		if (cwd == NULL)
5988 			return got_error_from_errno("getcwd");
5989 		error = got_worktree_open(&worktree, cwd, NULL);
5990 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5991 			goto done;
5992 		if (worktree)
5993 			repo_path =
5994 			    strdup(got_worktree_get_repo_path(worktree));
5995 		else
5996 			repo_path = strdup(cwd);
5997 		if (repo_path == NULL) {
5998 			error = got_error_from_errno("strdup");
5999 			goto done;
6000 		}
6001 	}
6002 
6003 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6004 	if (error)
6005 		goto done;
6006 
6007 	init_curses();
6008 
6009 	error = apply_unveil(got_repo_get_path(repo), NULL);
6010 	if (error)
6011 		goto done;
6012 
6013 	error = tog_load_refs(repo, 0);
6014 	if (error)
6015 		goto done;
6016 
6017 	if (id_str1 != NULL) {
6018 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6019 		    repo, worktree);
6020 		if (error != NULL)
6021 			goto done;
6022 		if (keyword_idstr1 != NULL)
6023 			id_str1 = keyword_idstr1;
6024 	}
6025 	if (id_str2 != NULL) {
6026 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6027 		    repo, worktree);
6028 		if (error != NULL)
6029 			goto done;
6030 		if (keyword_idstr2 != NULL)
6031 			id_str2 = keyword_idstr2;
6032 	}
6033 
6034 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6035 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6036 	if (error)
6037 		goto done;
6038 
6039 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6040 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6041 	if (error)
6042 		goto done;
6043 
6044 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6045 	if (view == NULL) {
6046 		error = got_error_from_errno("view_open");
6047 		goto done;
6048 	}
6049 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6050 	    ignore_whitespace, force_text_diff, NULL,  repo);
6051 	if (error)
6052 		goto done;
6053 	error = view_loop(view);
6054 done:
6055 	free(keyword_idstr1);
6056 	free(keyword_idstr2);
6057 	free(label1);
6058 	free(label2);
6059 	free(repo_path);
6060 	free(cwd);
6061 	if (repo) {
6062 		const struct got_error *close_err = got_repo_close(repo);
6063 		if (error == NULL)
6064 			error = close_err;
6065 	}
6066 	if (worktree)
6067 		got_worktree_close(worktree);
6068 	if (pack_fds) {
6069 		const struct got_error *pack_err =
6070 		    got_repo_pack_fds_close(pack_fds);
6071 		if (error == NULL)
6072 			error = pack_err;
6073 	}
6074 	tog_free_refs();
6075 	return error;
6076 }
6077 
6078 __dead static void
6079 usage_blame(void)
6080 {
6081 	endwin();
6082 	fprintf(stderr,
6083 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6084 	    getprogname());
6085 	exit(1);
6086 }
6087 
6088 struct tog_blame_line {
6089 	int annotated;
6090 	struct got_object_id *id;
6091 };
6092 
6093 static const struct got_error *
6094 draw_blame(struct tog_view *view)
6095 {
6096 	struct tog_blame_view_state *s = &view->state.blame;
6097 	struct tog_blame *blame = &s->blame;
6098 	regmatch_t *regmatch = &view->regmatch;
6099 	const struct got_error *err;
6100 	int lineno = 0, nprinted = 0;
6101 	char *line = NULL;
6102 	size_t linesize = 0;
6103 	ssize_t linelen;
6104 	wchar_t *wline;
6105 	int width;
6106 	struct tog_blame_line *blame_line;
6107 	struct got_object_id *prev_id = NULL;
6108 	char *id_str;
6109 	struct tog_color *tc;
6110 
6111 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6112 	if (err)
6113 		return err;
6114 
6115 	rewind(blame->f);
6116 	werase(view->window);
6117 
6118 	if (asprintf(&line, "commit %s", id_str) == -1) {
6119 		err = got_error_from_errno("asprintf");
6120 		free(id_str);
6121 		return err;
6122 	}
6123 
6124 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6125 	free(line);
6126 	line = NULL;
6127 	if (err)
6128 		return err;
6129 	if (view_needs_focus_indication(view))
6130 		wstandout(view->window);
6131 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6132 	if (tc)
6133 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6134 	waddwstr(view->window, wline);
6135 	while (width++ < view->ncols)
6136 		waddch(view->window, ' ');
6137 	if (tc)
6138 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6139 	if (view_needs_focus_indication(view))
6140 		wstandend(view->window);
6141 	free(wline);
6142 	wline = NULL;
6143 
6144 	if (view->gline > blame->nlines)
6145 		view->gline = blame->nlines;
6146 
6147 	if (tog_io.wait_for_ui) {
6148 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6149 		int rc;
6150 
6151 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6152 		if (rc)
6153 			return got_error_set_errno(rc, "pthread_cond_wait");
6154 		tog_io.wait_for_ui = 0;
6155 	}
6156 
6157 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6158 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6159 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6160 		free(id_str);
6161 		return got_error_from_errno("asprintf");
6162 	}
6163 	free(id_str);
6164 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6165 	free(line);
6166 	line = NULL;
6167 	if (err)
6168 		return err;
6169 	waddwstr(view->window, wline);
6170 	free(wline);
6171 	wline = NULL;
6172 	if (width < view->ncols - 1)
6173 		waddch(view->window, '\n');
6174 
6175 	s->eof = 0;
6176 	view->maxx = 0;
6177 	while (nprinted < view->nlines - 2) {
6178 		linelen = getline(&line, &linesize, blame->f);
6179 		if (linelen == -1) {
6180 			if (feof(blame->f)) {
6181 				s->eof = 1;
6182 				break;
6183 			}
6184 			free(line);
6185 			return got_ferror(blame->f, GOT_ERR_IO);
6186 		}
6187 		if (++lineno < s->first_displayed_line)
6188 			continue;
6189 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6190 			continue;
6191 
6192 		/* Set view->maxx based on full line length. */
6193 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6194 		if (err) {
6195 			free(line);
6196 			return err;
6197 		}
6198 		free(wline);
6199 		wline = NULL;
6200 		view->maxx = MAX(view->maxx, width);
6201 
6202 		if (nprinted == s->selected_line - 1)
6203 			wstandout(view->window);
6204 
6205 		if (blame->nlines > 0) {
6206 			blame_line = &blame->lines[lineno - 1];
6207 			if (blame_line->annotated && prev_id &&
6208 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6209 			    !(nprinted == s->selected_line - 1)) {
6210 				waddstr(view->window, "        ");
6211 			} else if (blame_line->annotated) {
6212 				char *id_str;
6213 				err = got_object_id_str(&id_str,
6214 				    blame_line->id);
6215 				if (err) {
6216 					free(line);
6217 					return err;
6218 				}
6219 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6220 				if (tc)
6221 					wattr_on(view->window,
6222 					    COLOR_PAIR(tc->colorpair), NULL);
6223 				wprintw(view->window, "%.8s", id_str);
6224 				if (tc)
6225 					wattr_off(view->window,
6226 					    COLOR_PAIR(tc->colorpair), NULL);
6227 				free(id_str);
6228 				prev_id = blame_line->id;
6229 			} else {
6230 				waddstr(view->window, "........");
6231 				prev_id = NULL;
6232 			}
6233 		} else {
6234 			waddstr(view->window, "........");
6235 			prev_id = NULL;
6236 		}
6237 
6238 		if (nprinted == s->selected_line - 1)
6239 			wstandend(view->window);
6240 		waddstr(view->window, " ");
6241 
6242 		if (view->ncols <= 9) {
6243 			width = 9;
6244 		} else if (s->first_displayed_line + nprinted ==
6245 		    s->matched_line &&
6246 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6247 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6248 			    view->window, view->x, regmatch);
6249 			if (err) {
6250 				free(line);
6251 				return err;
6252 			}
6253 			width += 9;
6254 		} else {
6255 			int skip;
6256 			err = format_line(&wline, &width, &skip, line,
6257 			    view->x, view->ncols - 9, 9, 1);
6258 			if (err) {
6259 				free(line);
6260 				return err;
6261 			}
6262 			waddwstr(view->window, &wline[skip]);
6263 			width += 9;
6264 			free(wline);
6265 			wline = NULL;
6266 		}
6267 
6268 		if (width <= view->ncols - 1)
6269 			waddch(view->window, '\n');
6270 		if (++nprinted == 1)
6271 			s->first_displayed_line = lineno;
6272 	}
6273 	free(line);
6274 	s->last_displayed_line = lineno;
6275 
6276 	view_border(view);
6277 
6278 	return NULL;
6279 }
6280 
6281 static const struct got_error *
6282 blame_cb(void *arg, int nlines, int lineno,
6283     struct got_commit_object *commit, struct got_object_id *id)
6284 {
6285 	const struct got_error *err = NULL;
6286 	struct tog_blame_cb_args *a = arg;
6287 	struct tog_blame_line *line;
6288 	int errcode;
6289 
6290 	if (nlines != a->nlines ||
6291 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6292 		return got_error(GOT_ERR_RANGE);
6293 
6294 	errcode = pthread_mutex_lock(&tog_mutex);
6295 	if (errcode)
6296 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6297 
6298 	if (*a->quit) {	/* user has quit the blame view */
6299 		err = got_error(GOT_ERR_ITER_COMPLETED);
6300 		goto done;
6301 	}
6302 
6303 	if (lineno == -1)
6304 		goto done; /* no change in this commit */
6305 
6306 	line = &a->lines[lineno - 1];
6307 	if (line->annotated)
6308 		goto done;
6309 
6310 	line->id = got_object_id_dup(id);
6311 	if (line->id == NULL) {
6312 		err = got_error_from_errno("got_object_id_dup");
6313 		goto done;
6314 	}
6315 	line->annotated = 1;
6316 done:
6317 	errcode = pthread_mutex_unlock(&tog_mutex);
6318 	if (errcode)
6319 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6320 	return err;
6321 }
6322 
6323 static void *
6324 blame_thread(void *arg)
6325 {
6326 	const struct got_error *err, *close_err;
6327 	struct tog_blame_thread_args *ta = arg;
6328 	struct tog_blame_cb_args *a = ta->cb_args;
6329 	int errcode, fd1 = -1, fd2 = -1;
6330 	FILE *f1 = NULL, *f2 = NULL;
6331 
6332 	fd1 = got_opentempfd();
6333 	if (fd1 == -1)
6334 		return (void *)got_error_from_errno("got_opentempfd");
6335 
6336 	fd2 = got_opentempfd();
6337 	if (fd2 == -1) {
6338 		err = got_error_from_errno("got_opentempfd");
6339 		goto done;
6340 	}
6341 
6342 	f1 = got_opentemp();
6343 	if (f1 == NULL) {
6344 		err = (void *)got_error_from_errno("got_opentemp");
6345 		goto done;
6346 	}
6347 	f2 = got_opentemp();
6348 	if (f2 == NULL) {
6349 		err = (void *)got_error_from_errno("got_opentemp");
6350 		goto done;
6351 	}
6352 
6353 	err = block_signals_used_by_main_thread();
6354 	if (err)
6355 		goto done;
6356 
6357 	err = got_blame(ta->path, a->commit_id, ta->repo,
6358 	    tog_diff_algo, blame_cb, ta->cb_args,
6359 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6360 	if (err && err->code == GOT_ERR_CANCELLED)
6361 		err = NULL;
6362 
6363 	errcode = pthread_mutex_lock(&tog_mutex);
6364 	if (errcode) {
6365 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6366 		goto done;
6367 	}
6368 
6369 	close_err = got_repo_close(ta->repo);
6370 	if (err == NULL)
6371 		err = close_err;
6372 	ta->repo = NULL;
6373 	*ta->complete = 1;
6374 
6375 	if (tog_io.wait_for_ui) {
6376 		errcode = pthread_cond_signal(&ta->blame_complete);
6377 		if (errcode && err == NULL)
6378 			err = got_error_set_errno(errcode,
6379 			    "pthread_cond_signal");
6380 	}
6381 
6382 	errcode = pthread_mutex_unlock(&tog_mutex);
6383 	if (errcode && err == NULL)
6384 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6385 
6386 done:
6387 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6388 		err = got_error_from_errno("close");
6389 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6390 		err = got_error_from_errno("close");
6391 	if (f1 && fclose(f1) == EOF && err == NULL)
6392 		err = got_error_from_errno("fclose");
6393 	if (f2 && fclose(f2) == EOF && err == NULL)
6394 		err = got_error_from_errno("fclose");
6395 
6396 	return (void *)err;
6397 }
6398 
6399 static struct got_object_id *
6400 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6401     int first_displayed_line, int selected_line)
6402 {
6403 	struct tog_blame_line *line;
6404 
6405 	if (nlines <= 0)
6406 		return NULL;
6407 
6408 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6409 	if (!line->annotated)
6410 		return NULL;
6411 
6412 	return line->id;
6413 }
6414 
6415 static struct got_object_id *
6416 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6417     int lineno)
6418 {
6419 	struct tog_blame_line *line;
6420 
6421 	if (nlines <= 0 || lineno >= nlines)
6422 		return NULL;
6423 
6424 	line = &lines[lineno - 1];
6425 	if (!line->annotated)
6426 		return NULL;
6427 
6428 	return line->id;
6429 }
6430 
6431 static const struct got_error *
6432 stop_blame(struct tog_blame *blame)
6433 {
6434 	const struct got_error *err = NULL;
6435 	int i;
6436 
6437 	if (blame->thread) {
6438 		int errcode;
6439 		errcode = pthread_mutex_unlock(&tog_mutex);
6440 		if (errcode)
6441 			return got_error_set_errno(errcode,
6442 			    "pthread_mutex_unlock");
6443 		errcode = pthread_join(blame->thread, (void **)&err);
6444 		if (errcode)
6445 			return got_error_set_errno(errcode, "pthread_join");
6446 		errcode = pthread_mutex_lock(&tog_mutex);
6447 		if (errcode)
6448 			return got_error_set_errno(errcode,
6449 			    "pthread_mutex_lock");
6450 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6451 			err = NULL;
6452 		blame->thread = 0; //NULL;
6453 	}
6454 	if (blame->thread_args.repo) {
6455 		const struct got_error *close_err;
6456 		close_err = got_repo_close(blame->thread_args.repo);
6457 		if (err == NULL)
6458 			err = close_err;
6459 		blame->thread_args.repo = NULL;
6460 	}
6461 	if (blame->f) {
6462 		if (fclose(blame->f) == EOF && err == NULL)
6463 			err = got_error_from_errno("fclose");
6464 		blame->f = NULL;
6465 	}
6466 	if (blame->lines) {
6467 		for (i = 0; i < blame->nlines; i++)
6468 			free(blame->lines[i].id);
6469 		free(blame->lines);
6470 		blame->lines = NULL;
6471 	}
6472 	free(blame->cb_args.commit_id);
6473 	blame->cb_args.commit_id = NULL;
6474 	if (blame->pack_fds) {
6475 		const struct got_error *pack_err =
6476 		    got_repo_pack_fds_close(blame->pack_fds);
6477 		if (err == NULL)
6478 			err = pack_err;
6479 		blame->pack_fds = NULL;
6480 	}
6481 	return err;
6482 }
6483 
6484 static const struct got_error *
6485 cancel_blame_view(void *arg)
6486 {
6487 	const struct got_error *err = NULL;
6488 	int *done = arg;
6489 	int errcode;
6490 
6491 	errcode = pthread_mutex_lock(&tog_mutex);
6492 	if (errcode)
6493 		return got_error_set_errno(errcode,
6494 		    "pthread_mutex_unlock");
6495 
6496 	if (*done)
6497 		err = got_error(GOT_ERR_CANCELLED);
6498 
6499 	errcode = pthread_mutex_unlock(&tog_mutex);
6500 	if (errcode)
6501 		return got_error_set_errno(errcode,
6502 		    "pthread_mutex_lock");
6503 
6504 	return err;
6505 }
6506 
6507 static const struct got_error *
6508 run_blame(struct tog_view *view)
6509 {
6510 	struct tog_blame_view_state *s = &view->state.blame;
6511 	struct tog_blame *blame = &s->blame;
6512 	const struct got_error *err = NULL;
6513 	struct got_commit_object *commit = NULL;
6514 	struct got_blob_object *blob = NULL;
6515 	struct got_repository *thread_repo = NULL;
6516 	struct got_object_id *obj_id = NULL;
6517 	int obj_type, fd = -1;
6518 	int *pack_fds = NULL;
6519 
6520 	err = got_object_open_as_commit(&commit, s->repo,
6521 	    &s->blamed_commit->id);
6522 	if (err)
6523 		return err;
6524 
6525 	fd = got_opentempfd();
6526 	if (fd == -1) {
6527 		err = got_error_from_errno("got_opentempfd");
6528 		goto done;
6529 	}
6530 
6531 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6532 	if (err)
6533 		goto done;
6534 
6535 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6536 	if (err)
6537 		goto done;
6538 
6539 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6540 		err = got_error(GOT_ERR_OBJ_TYPE);
6541 		goto done;
6542 	}
6543 
6544 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6545 	if (err)
6546 		goto done;
6547 	blame->f = got_opentemp();
6548 	if (blame->f == NULL) {
6549 		err = got_error_from_errno("got_opentemp");
6550 		goto done;
6551 	}
6552 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6553 	    &blame->line_offsets, blame->f, blob);
6554 	if (err)
6555 		goto done;
6556 	if (blame->nlines == 0) {
6557 		s->blame_complete = 1;
6558 		goto done;
6559 	}
6560 
6561 	/* Don't include \n at EOF in the blame line count. */
6562 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6563 		blame->nlines--;
6564 
6565 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6566 	if (blame->lines == NULL) {
6567 		err = got_error_from_errno("calloc");
6568 		goto done;
6569 	}
6570 
6571 	err = got_repo_pack_fds_open(&pack_fds);
6572 	if (err)
6573 		goto done;
6574 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6575 	    pack_fds);
6576 	if (err)
6577 		goto done;
6578 
6579 	blame->pack_fds = pack_fds;
6580 	blame->cb_args.view = view;
6581 	blame->cb_args.lines = blame->lines;
6582 	blame->cb_args.nlines = blame->nlines;
6583 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6584 	if (blame->cb_args.commit_id == NULL) {
6585 		err = got_error_from_errno("got_object_id_dup");
6586 		goto done;
6587 	}
6588 	blame->cb_args.quit = &s->done;
6589 
6590 	blame->thread_args.path = s->path;
6591 	blame->thread_args.repo = thread_repo;
6592 	blame->thread_args.cb_args = &blame->cb_args;
6593 	blame->thread_args.complete = &s->blame_complete;
6594 	blame->thread_args.cancel_cb = cancel_blame_view;
6595 	blame->thread_args.cancel_arg = &s->done;
6596 	s->blame_complete = 0;
6597 
6598 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6599 		s->first_displayed_line = 1;
6600 		s->last_displayed_line = view->nlines;
6601 		s->selected_line = 1;
6602 	}
6603 	s->matched_line = 0;
6604 
6605 done:
6606 	if (commit)
6607 		got_object_commit_close(commit);
6608 	if (fd != -1 && close(fd) == -1 && err == NULL)
6609 		err = got_error_from_errno("close");
6610 	if (blob)
6611 		got_object_blob_close(blob);
6612 	free(obj_id);
6613 	if (err)
6614 		stop_blame(blame);
6615 	return err;
6616 }
6617 
6618 static const struct got_error *
6619 open_blame_view(struct tog_view *view, char *path,
6620     struct got_object_id *commit_id, struct got_repository *repo)
6621 {
6622 	const struct got_error *err = NULL;
6623 	struct tog_blame_view_state *s = &view->state.blame;
6624 
6625 	STAILQ_INIT(&s->blamed_commits);
6626 
6627 	s->path = strdup(path);
6628 	if (s->path == NULL)
6629 		return got_error_from_errno("strdup");
6630 
6631 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6632 	if (err) {
6633 		free(s->path);
6634 		return err;
6635 	}
6636 
6637 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6638 	s->first_displayed_line = 1;
6639 	s->last_displayed_line = view->nlines;
6640 	s->selected_line = 1;
6641 	s->blame_complete = 0;
6642 	s->repo = repo;
6643 	s->commit_id = commit_id;
6644 	memset(&s->blame, 0, sizeof(s->blame));
6645 
6646 	STAILQ_INIT(&s->colors);
6647 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6648 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6649 		    get_color_value("TOG_COLOR_COMMIT"));
6650 		if (err)
6651 			return err;
6652 	}
6653 
6654 	view->show = show_blame_view;
6655 	view->input = input_blame_view;
6656 	view->reset = reset_blame_view;
6657 	view->close = close_blame_view;
6658 	view->search_start = search_start_blame_view;
6659 	view->search_setup = search_setup_blame_view;
6660 	view->search_next = search_next_view_match;
6661 
6662 	if (using_mock_io) {
6663 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6664 		int rc;
6665 
6666 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6667 		if (rc)
6668 			return got_error_set_errno(rc, "pthread_cond_init");
6669 	}
6670 
6671 	return run_blame(view);
6672 }
6673 
6674 static const struct got_error *
6675 close_blame_view(struct tog_view *view)
6676 {
6677 	const struct got_error *err = NULL;
6678 	struct tog_blame_view_state *s = &view->state.blame;
6679 
6680 	if (s->blame.thread)
6681 		err = stop_blame(&s->blame);
6682 
6683 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6684 		struct got_object_qid *blamed_commit;
6685 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6686 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6687 		got_object_qid_free(blamed_commit);
6688 	}
6689 
6690 	if (using_mock_io) {
6691 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6692 		int rc;
6693 
6694 		rc = pthread_cond_destroy(&bta->blame_complete);
6695 		if (rc && err == NULL)
6696 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6697 	}
6698 
6699 	free(s->path);
6700 	free_colors(&s->colors);
6701 	return err;
6702 }
6703 
6704 static const struct got_error *
6705 search_start_blame_view(struct tog_view *view)
6706 {
6707 	struct tog_blame_view_state *s = &view->state.blame;
6708 
6709 	s->matched_line = 0;
6710 	return NULL;
6711 }
6712 
6713 static void
6714 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6715     size_t *nlines, int **first, int **last, int **match, int **selected)
6716 {
6717 	struct tog_blame_view_state *s = &view->state.blame;
6718 
6719 	*f = s->blame.f;
6720 	*nlines = s->blame.nlines;
6721 	*line_offsets = s->blame.line_offsets;
6722 	*match = &s->matched_line;
6723 	*first = &s->first_displayed_line;
6724 	*last = &s->last_displayed_line;
6725 	*selected = &s->selected_line;
6726 }
6727 
6728 static const struct got_error *
6729 show_blame_view(struct tog_view *view)
6730 {
6731 	const struct got_error *err = NULL;
6732 	struct tog_blame_view_state *s = &view->state.blame;
6733 	int errcode;
6734 
6735 	if (s->blame.thread == 0 && !s->blame_complete) {
6736 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6737 		    &s->blame.thread_args);
6738 		if (errcode)
6739 			return got_error_set_errno(errcode, "pthread_create");
6740 
6741 		if (!using_mock_io)
6742 			halfdelay(1); /* fast refresh while annotating  */
6743 	}
6744 
6745 	if (s->blame_complete && !using_mock_io)
6746 		halfdelay(10); /* disable fast refresh */
6747 
6748 	err = draw_blame(view);
6749 
6750 	view_border(view);
6751 	return err;
6752 }
6753 
6754 static const struct got_error *
6755 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6756     struct got_repository *repo, struct got_object_id *id)
6757 {
6758 	struct tog_view		*log_view;
6759 	const struct got_error	*err = NULL;
6760 
6761 	*new_view = NULL;
6762 
6763 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6764 	if (log_view == NULL)
6765 		return got_error_from_errno("view_open");
6766 
6767 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6768 	if (err)
6769 		view_close(log_view);
6770 	else
6771 		*new_view = log_view;
6772 
6773 	return err;
6774 }
6775 
6776 static const struct got_error *
6777 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6778 {
6779 	const struct got_error *err = NULL, *thread_err = NULL;
6780 	struct tog_view *diff_view;
6781 	struct tog_blame_view_state *s = &view->state.blame;
6782 	int eos, nscroll, begin_y = 0, begin_x = 0;
6783 
6784 	eos = nscroll = view->nlines - 2;
6785 	if (view_is_hsplit_top(view))
6786 		--eos;  /* border */
6787 
6788 	switch (ch) {
6789 	case '0':
6790 	case '$':
6791 	case KEY_RIGHT:
6792 	case 'l':
6793 	case KEY_LEFT:
6794 	case 'h':
6795 		horizontal_scroll_input(view, ch);
6796 		break;
6797 	case 'q':
6798 		s->done = 1;
6799 		break;
6800 	case 'g':
6801 	case KEY_HOME:
6802 		s->selected_line = 1;
6803 		s->first_displayed_line = 1;
6804 		view->count = 0;
6805 		break;
6806 	case 'G':
6807 	case KEY_END:
6808 		if (s->blame.nlines < eos) {
6809 			s->selected_line = s->blame.nlines;
6810 			s->first_displayed_line = 1;
6811 		} else {
6812 			s->selected_line = eos;
6813 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6814 		}
6815 		view->count = 0;
6816 		break;
6817 	case 'k':
6818 	case KEY_UP:
6819 	case CTRL('p'):
6820 		if (s->selected_line > 1)
6821 			s->selected_line--;
6822 		else if (s->selected_line == 1 &&
6823 		    s->first_displayed_line > 1)
6824 			s->first_displayed_line--;
6825 		else
6826 			view->count = 0;
6827 		break;
6828 	case CTRL('u'):
6829 	case 'u':
6830 		nscroll /= 2;
6831 		/* FALL THROUGH */
6832 	case KEY_PPAGE:
6833 	case CTRL('b'):
6834 	case 'b':
6835 		if (s->first_displayed_line == 1) {
6836 			if (view->count > 1)
6837 				nscroll += nscroll;
6838 			s->selected_line = MAX(1, s->selected_line - nscroll);
6839 			view->count = 0;
6840 			break;
6841 		}
6842 		if (s->first_displayed_line > nscroll)
6843 			s->first_displayed_line -= nscroll;
6844 		else
6845 			s->first_displayed_line = 1;
6846 		break;
6847 	case 'j':
6848 	case KEY_DOWN:
6849 	case CTRL('n'):
6850 		if (s->selected_line < eos && s->first_displayed_line +
6851 		    s->selected_line <= s->blame.nlines)
6852 			s->selected_line++;
6853 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6854 			s->first_displayed_line++;
6855 		else
6856 			view->count = 0;
6857 		break;
6858 	case 'c':
6859 	case 'p': {
6860 		struct got_object_id *id = NULL;
6861 
6862 		view->count = 0;
6863 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6864 		    s->first_displayed_line, s->selected_line);
6865 		if (id == NULL)
6866 			break;
6867 		if (ch == 'p') {
6868 			struct got_commit_object *commit, *pcommit;
6869 			struct got_object_qid *pid;
6870 			struct got_object_id *blob_id = NULL;
6871 			int obj_type;
6872 			err = got_object_open_as_commit(&commit,
6873 			    s->repo, id);
6874 			if (err)
6875 				break;
6876 			pid = STAILQ_FIRST(
6877 			    got_object_commit_get_parent_ids(commit));
6878 			if (pid == NULL) {
6879 				got_object_commit_close(commit);
6880 				break;
6881 			}
6882 			/* Check if path history ends here. */
6883 			err = got_object_open_as_commit(&pcommit,
6884 			    s->repo, &pid->id);
6885 			if (err)
6886 				break;
6887 			err = got_object_id_by_path(&blob_id, s->repo,
6888 			    pcommit, s->path);
6889 			got_object_commit_close(pcommit);
6890 			if (err) {
6891 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6892 					err = NULL;
6893 				got_object_commit_close(commit);
6894 				break;
6895 			}
6896 			err = got_object_get_type(&obj_type, s->repo,
6897 			    blob_id);
6898 			free(blob_id);
6899 			/* Can't blame non-blob type objects. */
6900 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6901 				got_object_commit_close(commit);
6902 				break;
6903 			}
6904 			err = got_object_qid_alloc(&s->blamed_commit,
6905 			    &pid->id);
6906 			got_object_commit_close(commit);
6907 		} else {
6908 			if (got_object_id_cmp(id,
6909 			    &s->blamed_commit->id) == 0)
6910 				break;
6911 			err = got_object_qid_alloc(&s->blamed_commit,
6912 			    id);
6913 		}
6914 		if (err)
6915 			break;
6916 		s->done = 1;
6917 		thread_err = stop_blame(&s->blame);
6918 		s->done = 0;
6919 		if (thread_err)
6920 			break;
6921 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6922 		    s->blamed_commit, entry);
6923 		err = run_blame(view);
6924 		if (err)
6925 			break;
6926 		break;
6927 	}
6928 	case 'C': {
6929 		struct got_object_qid *first;
6930 
6931 		view->count = 0;
6932 		first = STAILQ_FIRST(&s->blamed_commits);
6933 		if (!got_object_id_cmp(&first->id, s->commit_id))
6934 			break;
6935 		s->done = 1;
6936 		thread_err = stop_blame(&s->blame);
6937 		s->done = 0;
6938 		if (thread_err)
6939 			break;
6940 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6941 		got_object_qid_free(s->blamed_commit);
6942 		s->blamed_commit =
6943 		    STAILQ_FIRST(&s->blamed_commits);
6944 		err = run_blame(view);
6945 		if (err)
6946 			break;
6947 		break;
6948 	}
6949 	case 'L':
6950 		view->count = 0;
6951 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6952 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6953 		if (s->id_to_log)
6954 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6955 		break;
6956 	case KEY_ENTER:
6957 	case '\r': {
6958 		struct got_object_id *id = NULL;
6959 		struct got_object_qid *pid;
6960 		struct got_commit_object *commit = NULL;
6961 
6962 		view->count = 0;
6963 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6964 		    s->first_displayed_line, s->selected_line);
6965 		if (id == NULL)
6966 			break;
6967 		err = got_object_open_as_commit(&commit, s->repo, id);
6968 		if (err)
6969 			break;
6970 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6971 		if (*new_view) {
6972 			/* traversed from diff view, release diff resources  */
6973 			err = close_diff_view(*new_view);
6974 			if (err)
6975 				break;
6976 			diff_view = *new_view;
6977 		} else {
6978 			if (view_is_parent_view(view))
6979 				view_get_split(view, &begin_y, &begin_x);
6980 
6981 			diff_view = view_open(0, 0, begin_y, begin_x,
6982 			    TOG_VIEW_DIFF);
6983 			if (diff_view == NULL) {
6984 				got_object_commit_close(commit);
6985 				err = got_error_from_errno("view_open");
6986 				break;
6987 			}
6988 		}
6989 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6990 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6991 		got_object_commit_close(commit);
6992 		if (err)
6993 			break;
6994 		s->last_diffed_line = s->first_displayed_line - 1 +
6995 		    s->selected_line;
6996 		if (*new_view)
6997 			break;	/* still open from active diff view */
6998 		if (view_is_parent_view(view) &&
6999 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
7000 			err = view_init_hsplit(view, begin_y);
7001 			if (err)
7002 				break;
7003 		}
7004 
7005 		view->focussed = 0;
7006 		diff_view->focussed = 1;
7007 		diff_view->mode = view->mode;
7008 		diff_view->nlines = view->lines - begin_y;
7009 		if (view_is_parent_view(view)) {
7010 			view_transfer_size(diff_view, view);
7011 			err = view_close_child(view);
7012 			if (err)
7013 				break;
7014 			err = view_set_child(view, diff_view);
7015 			if (err)
7016 				break;
7017 			view->focus_child = 1;
7018 		} else
7019 			*new_view = diff_view;
7020 		if (err)
7021 			break;
7022 		break;
7023 	}
7024 	case CTRL('d'):
7025 	case 'd':
7026 		nscroll /= 2;
7027 		/* FALL THROUGH */
7028 	case KEY_NPAGE:
7029 	case CTRL('f'):
7030 	case 'f':
7031 	case ' ':
7032 		if (s->last_displayed_line >= s->blame.nlines &&
7033 		    s->selected_line >= MIN(s->blame.nlines,
7034 		    view->nlines - 2)) {
7035 			view->count = 0;
7036 			break;
7037 		}
7038 		if (s->last_displayed_line >= s->blame.nlines &&
7039 		    s->selected_line < view->nlines - 2) {
7040 			s->selected_line +=
7041 			    MIN(nscroll, s->last_displayed_line -
7042 			    s->first_displayed_line - s->selected_line + 1);
7043 		}
7044 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7045 			s->first_displayed_line += nscroll;
7046 		else
7047 			s->first_displayed_line =
7048 			    s->blame.nlines - (view->nlines - 3);
7049 		break;
7050 	case KEY_RESIZE:
7051 		if (s->selected_line > view->nlines - 2) {
7052 			s->selected_line = MIN(s->blame.nlines,
7053 			    view->nlines - 2);
7054 		}
7055 		break;
7056 	default:
7057 		view->count = 0;
7058 		break;
7059 	}
7060 	return thread_err ? thread_err : err;
7061 }
7062 
7063 static const struct got_error *
7064 reset_blame_view(struct tog_view *view)
7065 {
7066 	const struct got_error *err;
7067 	struct tog_blame_view_state *s = &view->state.blame;
7068 
7069 	view->count = 0;
7070 	s->done = 1;
7071 	err = stop_blame(&s->blame);
7072 	s->done = 0;
7073 	if (err)
7074 		return err;
7075 	return run_blame(view);
7076 }
7077 
7078 static const struct got_error *
7079 cmd_blame(int argc, char *argv[])
7080 {
7081 	const struct got_error *error;
7082 	struct got_repository *repo = NULL;
7083 	struct got_worktree *worktree = NULL;
7084 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7085 	char *link_target = NULL;
7086 	struct got_object_id *commit_id = NULL;
7087 	struct got_commit_object *commit = NULL;
7088 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7089 	int ch;
7090 	struct tog_view *view = NULL;
7091 	int *pack_fds = NULL;
7092 
7093 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7094 		switch (ch) {
7095 		case 'c':
7096 			commit_id_str = optarg;
7097 			break;
7098 		case 'r':
7099 			repo_path = realpath(optarg, NULL);
7100 			if (repo_path == NULL)
7101 				return got_error_from_errno2("realpath",
7102 				    optarg);
7103 			break;
7104 		default:
7105 			usage_blame();
7106 			/* NOTREACHED */
7107 		}
7108 	}
7109 
7110 	argc -= optind;
7111 	argv += optind;
7112 
7113 	if (argc != 1)
7114 		usage_blame();
7115 
7116 	error = got_repo_pack_fds_open(&pack_fds);
7117 	if (error != NULL)
7118 		goto done;
7119 
7120 	if (repo_path == NULL) {
7121 		cwd = getcwd(NULL, 0);
7122 		if (cwd == NULL)
7123 			return got_error_from_errno("getcwd");
7124 		error = got_worktree_open(&worktree, cwd, NULL);
7125 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7126 			goto done;
7127 		if (worktree)
7128 			repo_path =
7129 			    strdup(got_worktree_get_repo_path(worktree));
7130 		else
7131 			repo_path = strdup(cwd);
7132 		if (repo_path == NULL) {
7133 			error = got_error_from_errno("strdup");
7134 			goto done;
7135 		}
7136 	}
7137 
7138 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7139 	if (error != NULL)
7140 		goto done;
7141 
7142 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7143 	    worktree);
7144 	if (error)
7145 		goto done;
7146 
7147 	init_curses();
7148 
7149 	error = apply_unveil(got_repo_get_path(repo), NULL);
7150 	if (error)
7151 		goto done;
7152 
7153 	error = tog_load_refs(repo, 0);
7154 	if (error)
7155 		goto done;
7156 
7157 	if (commit_id_str == NULL) {
7158 		struct got_reference *head_ref;
7159 		error = got_ref_open(&head_ref, repo, worktree ?
7160 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7161 		if (error != NULL)
7162 			goto done;
7163 		error = got_ref_resolve(&commit_id, repo, head_ref);
7164 		got_ref_close(head_ref);
7165 	} else {
7166 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7167 		    repo, worktree);
7168 		if (error != NULL)
7169 			goto done;
7170 		if (keyword_idstr != NULL)
7171 			commit_id_str = keyword_idstr;
7172 
7173 		error = got_repo_match_object_id(&commit_id, NULL,
7174 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7175 	}
7176 	if (error != NULL)
7177 		goto done;
7178 
7179 	error = got_object_open_as_commit(&commit, repo, commit_id);
7180 	if (error)
7181 		goto done;
7182 
7183 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7184 	    commit, repo);
7185 	if (error)
7186 		goto done;
7187 
7188 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7189 	if (view == NULL) {
7190 		error = got_error_from_errno("view_open");
7191 		goto done;
7192 	}
7193 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7194 	    commit_id, repo);
7195 	if (error != NULL) {
7196 		if (view->close == NULL)
7197 			close_blame_view(view);
7198 		view_close(view);
7199 		goto done;
7200 	}
7201 	if (worktree) {
7202 		/* Release work tree lock. */
7203 		got_worktree_close(worktree);
7204 		worktree = NULL;
7205 	}
7206 	error = view_loop(view);
7207 done:
7208 	free(repo_path);
7209 	free(in_repo_path);
7210 	free(link_target);
7211 	free(cwd);
7212 	free(commit_id);
7213 	free(keyword_idstr);
7214 	if (commit)
7215 		got_object_commit_close(commit);
7216 	if (worktree)
7217 		got_worktree_close(worktree);
7218 	if (repo) {
7219 		const struct got_error *close_err = got_repo_close(repo);
7220 		if (error == NULL)
7221 			error = close_err;
7222 	}
7223 	if (pack_fds) {
7224 		const struct got_error *pack_err =
7225 		    got_repo_pack_fds_close(pack_fds);
7226 		if (error == NULL)
7227 			error = pack_err;
7228 	}
7229 	tog_free_refs();
7230 	return error;
7231 }
7232 
7233 static const struct got_error *
7234 draw_tree_entries(struct tog_view *view, const char *parent_path)
7235 {
7236 	struct tog_tree_view_state *s = &view->state.tree;
7237 	const struct got_error *err = NULL;
7238 	struct got_tree_entry *te;
7239 	wchar_t *wline;
7240 	char *index = NULL;
7241 	struct tog_color *tc;
7242 	int width, n, nentries, scrollx, i = 1;
7243 	int limit = view->nlines;
7244 
7245 	s->ndisplayed = 0;
7246 	if (view_is_hsplit_top(view))
7247 		--limit;  /* border */
7248 
7249 	werase(view->window);
7250 
7251 	if (limit == 0)
7252 		return NULL;
7253 
7254 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7255 	    0, 0);
7256 	if (err)
7257 		return err;
7258 	if (view_needs_focus_indication(view))
7259 		wstandout(view->window);
7260 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7261 	if (tc)
7262 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7263 	waddwstr(view->window, wline);
7264 	free(wline);
7265 	wline = NULL;
7266 	while (width++ < view->ncols)
7267 		waddch(view->window, ' ');
7268 	if (tc)
7269 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7270 	if (view_needs_focus_indication(view))
7271 		wstandend(view->window);
7272 	if (--limit <= 0)
7273 		return NULL;
7274 
7275 	i += s->selected;
7276 	if (s->first_displayed_entry) {
7277 		i += got_tree_entry_get_index(s->first_displayed_entry);
7278 		if (s->tree != s->root)
7279 			++i;  /* account for ".." entry */
7280 	}
7281 	nentries = got_object_tree_get_nentries(s->tree);
7282 	if (asprintf(&index, "[%d/%d] %s",
7283 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7284 		return got_error_from_errno("asprintf");
7285 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7286 	free(index);
7287 	if (err)
7288 		return err;
7289 	waddwstr(view->window, wline);
7290 	free(wline);
7291 	wline = NULL;
7292 	if (width < view->ncols - 1)
7293 		waddch(view->window, '\n');
7294 	if (--limit <= 0)
7295 		return NULL;
7296 	waddch(view->window, '\n');
7297 	if (--limit <= 0)
7298 		return NULL;
7299 
7300 	if (s->first_displayed_entry == NULL) {
7301 		te = got_object_tree_get_first_entry(s->tree);
7302 		if (s->selected == 0) {
7303 			if (view->focussed)
7304 				wstandout(view->window);
7305 			s->selected_entry = NULL;
7306 		}
7307 		waddstr(view->window, "  ..\n");	/* parent directory */
7308 		if (s->selected == 0 && view->focussed)
7309 			wstandend(view->window);
7310 		s->ndisplayed++;
7311 		if (--limit <= 0)
7312 			return NULL;
7313 		n = 1;
7314 	} else {
7315 		n = 0;
7316 		te = s->first_displayed_entry;
7317 	}
7318 
7319 	view->maxx = 0;
7320 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7321 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7322 		const char *modestr = "";
7323 		mode_t mode;
7324 
7325 		te = got_object_tree_get_entry(s->tree, i);
7326 		mode = got_tree_entry_get_mode(te);
7327 
7328 		if (s->show_ids) {
7329 			err = got_object_id_str(&id_str,
7330 			    got_tree_entry_get_id(te));
7331 			if (err)
7332 				return got_error_from_errno(
7333 				    "got_object_id_str");
7334 		}
7335 		if (got_object_tree_entry_is_submodule(te))
7336 			modestr = "$";
7337 		else if (S_ISLNK(mode)) {
7338 			int i;
7339 
7340 			err = got_tree_entry_get_symlink_target(&link_target,
7341 			    te, s->repo);
7342 			if (err) {
7343 				free(id_str);
7344 				return err;
7345 			}
7346 			for (i = 0; link_target[i] != '\0'; i++) {
7347 				if (!isprint((unsigned char)link_target[i]))
7348 					link_target[i] = '?';
7349 			}
7350 			modestr = "@";
7351 		}
7352 		else if (S_ISDIR(mode))
7353 			modestr = "/";
7354 		else if (mode & S_IXUSR)
7355 			modestr = "*";
7356 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7357 		    got_tree_entry_get_name(te), modestr,
7358 		    link_target ? " -> ": "",
7359 		    link_target ? link_target : "") == -1) {
7360 			free(id_str);
7361 			free(link_target);
7362 			return got_error_from_errno("asprintf");
7363 		}
7364 		free(id_str);
7365 		free(link_target);
7366 
7367 		/* use full line width to determine view->maxx */
7368 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7369 		if (err) {
7370 			free(line);
7371 			break;
7372 		}
7373 		view->maxx = MAX(view->maxx, width);
7374 		free(wline);
7375 		wline = NULL;
7376 
7377 		err = format_line(&wline, &width, &scrollx, line, view->x,
7378 		    view->ncols, 0, 0);
7379 		if (err) {
7380 			free(line);
7381 			break;
7382 		}
7383 		if (n == s->selected) {
7384 			if (view->focussed)
7385 				wstandout(view->window);
7386 			s->selected_entry = te;
7387 		}
7388 		tc = match_color(&s->colors, line);
7389 		if (tc)
7390 			wattr_on(view->window,
7391 			    COLOR_PAIR(tc->colorpair), NULL);
7392 		waddwstr(view->window, &wline[scrollx]);
7393 		if (tc)
7394 			wattr_off(view->window,
7395 			    COLOR_PAIR(tc->colorpair), NULL);
7396 		if (width < view->ncols)
7397 			waddch(view->window, '\n');
7398 		if (n == s->selected && view->focussed)
7399 			wstandend(view->window);
7400 		free(line);
7401 		free(wline);
7402 		wline = NULL;
7403 		n++;
7404 		s->ndisplayed++;
7405 		s->last_displayed_entry = te;
7406 		if (--limit <= 0)
7407 			break;
7408 	}
7409 
7410 	return err;
7411 }
7412 
7413 static void
7414 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7415 {
7416 	struct got_tree_entry *te;
7417 	int isroot = s->tree == s->root;
7418 	int i = 0;
7419 
7420 	if (s->first_displayed_entry == NULL)
7421 		return;
7422 
7423 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7424 	while (i++ < maxscroll) {
7425 		if (te == NULL) {
7426 			if (!isroot)
7427 				s->first_displayed_entry = NULL;
7428 			break;
7429 		}
7430 		s->first_displayed_entry = te;
7431 		te = got_tree_entry_get_prev(s->tree, te);
7432 	}
7433 }
7434 
7435 static const struct got_error *
7436 tree_scroll_down(struct tog_view *view, int maxscroll)
7437 {
7438 	struct tog_tree_view_state *s = &view->state.tree;
7439 	struct got_tree_entry *next, *last;
7440 	int n = 0;
7441 
7442 	if (s->first_displayed_entry)
7443 		next = got_tree_entry_get_next(s->tree,
7444 		    s->first_displayed_entry);
7445 	else
7446 		next = got_object_tree_get_first_entry(s->tree);
7447 
7448 	last = s->last_displayed_entry;
7449 	while (next && n++ < maxscroll) {
7450 		if (last) {
7451 			s->last_displayed_entry = last;
7452 			last = got_tree_entry_get_next(s->tree, last);
7453 		}
7454 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7455 			s->first_displayed_entry = next;
7456 			next = got_tree_entry_get_next(s->tree, next);
7457 		}
7458 	}
7459 
7460 	return NULL;
7461 }
7462 
7463 static const struct got_error *
7464 tree_entry_path(char **path, struct tog_parent_trees *parents,
7465     struct got_tree_entry *te)
7466 {
7467 	const struct got_error *err = NULL;
7468 	struct tog_parent_tree *pt;
7469 	size_t len = 2; /* for leading slash and NUL */
7470 
7471 	TAILQ_FOREACH(pt, parents, entry)
7472 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7473 		    + 1 /* slash */;
7474 	if (te)
7475 		len += strlen(got_tree_entry_get_name(te));
7476 
7477 	*path = calloc(1, len);
7478 	if (path == NULL)
7479 		return got_error_from_errno("calloc");
7480 
7481 	(*path)[0] = '/';
7482 	pt = TAILQ_LAST(parents, tog_parent_trees);
7483 	while (pt) {
7484 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7485 		if (strlcat(*path, name, len) >= len) {
7486 			err = got_error(GOT_ERR_NO_SPACE);
7487 			goto done;
7488 		}
7489 		if (strlcat(*path, "/", len) >= len) {
7490 			err = got_error(GOT_ERR_NO_SPACE);
7491 			goto done;
7492 		}
7493 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7494 	}
7495 	if (te) {
7496 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7497 			err = got_error(GOT_ERR_NO_SPACE);
7498 			goto done;
7499 		}
7500 	}
7501 done:
7502 	if (err) {
7503 		free(*path);
7504 		*path = NULL;
7505 	}
7506 	return err;
7507 }
7508 
7509 static const struct got_error *
7510 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7511     struct got_tree_entry *te, struct tog_parent_trees *parents,
7512     struct got_object_id *commit_id, struct got_repository *repo)
7513 {
7514 	const struct got_error *err = NULL;
7515 	char *path;
7516 	struct tog_view *blame_view;
7517 
7518 	*new_view = NULL;
7519 
7520 	err = tree_entry_path(&path, parents, te);
7521 	if (err)
7522 		return err;
7523 
7524 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7525 	if (blame_view == NULL) {
7526 		err = got_error_from_errno("view_open");
7527 		goto done;
7528 	}
7529 
7530 	err = open_blame_view(blame_view, path, commit_id, repo);
7531 	if (err) {
7532 		if (err->code == GOT_ERR_CANCELLED)
7533 			err = NULL;
7534 		view_close(blame_view);
7535 	} else
7536 		*new_view = blame_view;
7537 done:
7538 	free(path);
7539 	return err;
7540 }
7541 
7542 static const struct got_error *
7543 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7544     struct tog_tree_view_state *s)
7545 {
7546 	struct tog_view *log_view;
7547 	const struct got_error *err = NULL;
7548 	char *path;
7549 
7550 	*new_view = NULL;
7551 
7552 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7553 	if (log_view == NULL)
7554 		return got_error_from_errno("view_open");
7555 
7556 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7557 	if (err)
7558 		return err;
7559 
7560 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7561 	    path, 0);
7562 	if (err)
7563 		view_close(log_view);
7564 	else
7565 		*new_view = log_view;
7566 	free(path);
7567 	return err;
7568 }
7569 
7570 static const struct got_error *
7571 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7572     const char *head_ref_name, struct got_repository *repo)
7573 {
7574 	const struct got_error *err = NULL;
7575 	char *commit_id_str = NULL;
7576 	struct tog_tree_view_state *s = &view->state.tree;
7577 	struct got_commit_object *commit = NULL;
7578 
7579 	TAILQ_INIT(&s->parents);
7580 	STAILQ_INIT(&s->colors);
7581 
7582 	s->commit_id = got_object_id_dup(commit_id);
7583 	if (s->commit_id == NULL) {
7584 		err = got_error_from_errno("got_object_id_dup");
7585 		goto done;
7586 	}
7587 
7588 	err = got_object_open_as_commit(&commit, repo, commit_id);
7589 	if (err)
7590 		goto done;
7591 
7592 	/*
7593 	 * The root is opened here and will be closed when the view is closed.
7594 	 * Any visited subtrees and their path-wise parents are opened and
7595 	 * closed on demand.
7596 	 */
7597 	err = got_object_open_as_tree(&s->root, repo,
7598 	    got_object_commit_get_tree_id(commit));
7599 	if (err)
7600 		goto done;
7601 	s->tree = s->root;
7602 
7603 	err = got_object_id_str(&commit_id_str, commit_id);
7604 	if (err != NULL)
7605 		goto done;
7606 
7607 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7608 		err = got_error_from_errno("asprintf");
7609 		goto done;
7610 	}
7611 
7612 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7613 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7614 	if (head_ref_name) {
7615 		s->head_ref_name = strdup(head_ref_name);
7616 		if (s->head_ref_name == NULL) {
7617 			err = got_error_from_errno("strdup");
7618 			goto done;
7619 		}
7620 	}
7621 	s->repo = repo;
7622 
7623 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7624 		err = add_color(&s->colors, "\\$$",
7625 		    TOG_COLOR_TREE_SUBMODULE,
7626 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7627 		if (err)
7628 			goto done;
7629 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7630 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7631 		if (err)
7632 			goto done;
7633 		err = add_color(&s->colors, "/$",
7634 		    TOG_COLOR_TREE_DIRECTORY,
7635 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7636 		if (err)
7637 			goto done;
7638 
7639 		err = add_color(&s->colors, "\\*$",
7640 		    TOG_COLOR_TREE_EXECUTABLE,
7641 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7642 		if (err)
7643 			goto done;
7644 
7645 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7646 		    get_color_value("TOG_COLOR_COMMIT"));
7647 		if (err)
7648 			goto done;
7649 	}
7650 
7651 	view->show = show_tree_view;
7652 	view->input = input_tree_view;
7653 	view->close = close_tree_view;
7654 	view->search_start = search_start_tree_view;
7655 	view->search_next = search_next_tree_view;
7656 done:
7657 	free(commit_id_str);
7658 	if (commit)
7659 		got_object_commit_close(commit);
7660 	if (err) {
7661 		if (view->close == NULL)
7662 			close_tree_view(view);
7663 		view_close(view);
7664 	}
7665 	return err;
7666 }
7667 
7668 static const struct got_error *
7669 close_tree_view(struct tog_view *view)
7670 {
7671 	struct tog_tree_view_state *s = &view->state.tree;
7672 
7673 	free_colors(&s->colors);
7674 	free(s->tree_label);
7675 	s->tree_label = NULL;
7676 	free(s->commit_id);
7677 	s->commit_id = NULL;
7678 	free(s->head_ref_name);
7679 	s->head_ref_name = NULL;
7680 	while (!TAILQ_EMPTY(&s->parents)) {
7681 		struct tog_parent_tree *parent;
7682 		parent = TAILQ_FIRST(&s->parents);
7683 		TAILQ_REMOVE(&s->parents, parent, entry);
7684 		if (parent->tree != s->root)
7685 			got_object_tree_close(parent->tree);
7686 		free(parent);
7687 
7688 	}
7689 	if (s->tree != NULL && s->tree != s->root)
7690 		got_object_tree_close(s->tree);
7691 	if (s->root)
7692 		got_object_tree_close(s->root);
7693 	return NULL;
7694 }
7695 
7696 static const struct got_error *
7697 search_start_tree_view(struct tog_view *view)
7698 {
7699 	struct tog_tree_view_state *s = &view->state.tree;
7700 
7701 	s->matched_entry = NULL;
7702 	return NULL;
7703 }
7704 
7705 static int
7706 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7707 {
7708 	regmatch_t regmatch;
7709 
7710 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7711 	    0) == 0;
7712 }
7713 
7714 static const struct got_error *
7715 search_next_tree_view(struct tog_view *view)
7716 {
7717 	struct tog_tree_view_state *s = &view->state.tree;
7718 	struct got_tree_entry *te = NULL;
7719 
7720 	if (!view->searching) {
7721 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7722 		return NULL;
7723 	}
7724 
7725 	if (s->matched_entry) {
7726 		if (view->searching == TOG_SEARCH_FORWARD) {
7727 			if (s->selected_entry)
7728 				te = got_tree_entry_get_next(s->tree,
7729 				    s->selected_entry);
7730 			else
7731 				te = got_object_tree_get_first_entry(s->tree);
7732 		} else {
7733 			if (s->selected_entry == NULL)
7734 				te = got_object_tree_get_last_entry(s->tree);
7735 			else
7736 				te = got_tree_entry_get_prev(s->tree,
7737 				    s->selected_entry);
7738 		}
7739 	} else {
7740 		if (s->selected_entry)
7741 			te = s->selected_entry;
7742 		else if (view->searching == TOG_SEARCH_FORWARD)
7743 			te = got_object_tree_get_first_entry(s->tree);
7744 		else
7745 			te = got_object_tree_get_last_entry(s->tree);
7746 	}
7747 
7748 	while (1) {
7749 		if (te == NULL) {
7750 			if (s->matched_entry == NULL) {
7751 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7752 				return NULL;
7753 			}
7754 			if (view->searching == TOG_SEARCH_FORWARD)
7755 				te = got_object_tree_get_first_entry(s->tree);
7756 			else
7757 				te = got_object_tree_get_last_entry(s->tree);
7758 		}
7759 
7760 		if (match_tree_entry(te, &view->regex)) {
7761 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7762 			s->matched_entry = te;
7763 			break;
7764 		}
7765 
7766 		if (view->searching == TOG_SEARCH_FORWARD)
7767 			te = got_tree_entry_get_next(s->tree, te);
7768 		else
7769 			te = got_tree_entry_get_prev(s->tree, te);
7770 	}
7771 
7772 	if (s->matched_entry) {
7773 		s->first_displayed_entry = s->matched_entry;
7774 		s->selected = 0;
7775 	}
7776 
7777 	return NULL;
7778 }
7779 
7780 static const struct got_error *
7781 show_tree_view(struct tog_view *view)
7782 {
7783 	const struct got_error *err = NULL;
7784 	struct tog_tree_view_state *s = &view->state.tree;
7785 	char *parent_path;
7786 
7787 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7788 	if (err)
7789 		return err;
7790 
7791 	err = draw_tree_entries(view, parent_path);
7792 	free(parent_path);
7793 
7794 	view_border(view);
7795 	return err;
7796 }
7797 
7798 static const struct got_error *
7799 tree_goto_line(struct tog_view *view, int nlines)
7800 {
7801 	const struct got_error		 *err = NULL;
7802 	struct tog_tree_view_state	 *s = &view->state.tree;
7803 	struct got_tree_entry		**fte, **lte, **ste;
7804 	int				  g, last, first = 1, i = 1;
7805 	int				  root = s->tree == s->root;
7806 	int				  off = root ? 1 : 2;
7807 
7808 	g = view->gline;
7809 	view->gline = 0;
7810 
7811 	if (g == 0)
7812 		g = 1;
7813 	else if (g > got_object_tree_get_nentries(s->tree))
7814 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7815 
7816 	fte = &s->first_displayed_entry;
7817 	lte = &s->last_displayed_entry;
7818 	ste = &s->selected_entry;
7819 
7820 	if (*fte != NULL) {
7821 		first = got_tree_entry_get_index(*fte);
7822 		first += off;  /* account for ".." */
7823 	}
7824 	last = got_tree_entry_get_index(*lte);
7825 	last += off;
7826 
7827 	if (g >= first && g <= last && g - first < nlines) {
7828 		s->selected = g - first;
7829 		return NULL;	/* gline is on the current page */
7830 	}
7831 
7832 	if (*ste != NULL) {
7833 		i = got_tree_entry_get_index(*ste);
7834 		i += off;
7835 	}
7836 
7837 	if (i < g) {
7838 		err = tree_scroll_down(view, g - i);
7839 		if (err)
7840 			return err;
7841 		if (got_tree_entry_get_index(*lte) >=
7842 		    got_object_tree_get_nentries(s->tree) - 1 &&
7843 		    first + s->selected < g &&
7844 		    s->selected < s->ndisplayed - 1) {
7845 			first = got_tree_entry_get_index(*fte);
7846 			first += off;
7847 			s->selected = g - first;
7848 		}
7849 	} else if (i > g)
7850 		tree_scroll_up(s, i - g);
7851 
7852 	if (g < nlines &&
7853 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7854 		s->selected = g - 1;
7855 
7856 	return NULL;
7857 }
7858 
7859 static const struct got_error *
7860 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7861 {
7862 	const struct got_error *err = NULL;
7863 	struct tog_tree_view_state *s = &view->state.tree;
7864 	struct got_tree_entry *te;
7865 	int n, nscroll = view->nlines - 3;
7866 
7867 	if (view->gline)
7868 		return tree_goto_line(view, nscroll);
7869 
7870 	switch (ch) {
7871 	case '0':
7872 	case '$':
7873 	case KEY_RIGHT:
7874 	case 'l':
7875 	case KEY_LEFT:
7876 	case 'h':
7877 		horizontal_scroll_input(view, ch);
7878 		break;
7879 	case 'i':
7880 		s->show_ids = !s->show_ids;
7881 		view->count = 0;
7882 		break;
7883 	case 'L':
7884 		view->count = 0;
7885 		if (!s->selected_entry)
7886 			break;
7887 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7888 		break;
7889 	case 'R':
7890 		view->count = 0;
7891 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7892 		break;
7893 	case 'g':
7894 	case '=':
7895 	case KEY_HOME:
7896 		s->selected = 0;
7897 		view->count = 0;
7898 		if (s->tree == s->root)
7899 			s->first_displayed_entry =
7900 			    got_object_tree_get_first_entry(s->tree);
7901 		else
7902 			s->first_displayed_entry = NULL;
7903 		break;
7904 	case 'G':
7905 	case '*':
7906 	case KEY_END: {
7907 		int eos = view->nlines - 3;
7908 
7909 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7910 			--eos;  /* border */
7911 		s->selected = 0;
7912 		view->count = 0;
7913 		te = got_object_tree_get_last_entry(s->tree);
7914 		for (n = 0; n < eos; n++) {
7915 			if (te == NULL) {
7916 				if (s->tree != s->root) {
7917 					s->first_displayed_entry = NULL;
7918 					n++;
7919 				}
7920 				break;
7921 			}
7922 			s->first_displayed_entry = te;
7923 			te = got_tree_entry_get_prev(s->tree, te);
7924 		}
7925 		if (n > 0)
7926 			s->selected = n - 1;
7927 		break;
7928 	}
7929 	case 'k':
7930 	case KEY_UP:
7931 	case CTRL('p'):
7932 		if (s->selected > 0) {
7933 			s->selected--;
7934 			break;
7935 		}
7936 		tree_scroll_up(s, 1);
7937 		if (s->selected_entry == NULL ||
7938 		    (s->tree == s->root && s->selected_entry ==
7939 		     got_object_tree_get_first_entry(s->tree)))
7940 			view->count = 0;
7941 		break;
7942 	case CTRL('u'):
7943 	case 'u':
7944 		nscroll /= 2;
7945 		/* FALL THROUGH */
7946 	case KEY_PPAGE:
7947 	case CTRL('b'):
7948 	case 'b':
7949 		if (s->tree == s->root) {
7950 			if (got_object_tree_get_first_entry(s->tree) ==
7951 			    s->first_displayed_entry)
7952 				s->selected -= MIN(s->selected, nscroll);
7953 		} else {
7954 			if (s->first_displayed_entry == NULL)
7955 				s->selected -= MIN(s->selected, nscroll);
7956 		}
7957 		tree_scroll_up(s, MAX(0, nscroll));
7958 		if (s->selected_entry == NULL ||
7959 		    (s->tree == s->root && s->selected_entry ==
7960 		     got_object_tree_get_first_entry(s->tree)))
7961 			view->count = 0;
7962 		break;
7963 	case 'j':
7964 	case KEY_DOWN:
7965 	case CTRL('n'):
7966 		if (s->selected < s->ndisplayed - 1) {
7967 			s->selected++;
7968 			break;
7969 		}
7970 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7971 		    == NULL) {
7972 			/* can't scroll any further */
7973 			view->count = 0;
7974 			break;
7975 		}
7976 		tree_scroll_down(view, 1);
7977 		break;
7978 	case CTRL('d'):
7979 	case 'd':
7980 		nscroll /= 2;
7981 		/* FALL THROUGH */
7982 	case KEY_NPAGE:
7983 	case CTRL('f'):
7984 	case 'f':
7985 	case ' ':
7986 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7987 		    == NULL) {
7988 			/* can't scroll any further; move cursor down */
7989 			if (s->selected < s->ndisplayed - 1)
7990 				s->selected += MIN(nscroll,
7991 				    s->ndisplayed - s->selected - 1);
7992 			else
7993 				view->count = 0;
7994 			break;
7995 		}
7996 		tree_scroll_down(view, nscroll);
7997 		break;
7998 	case KEY_ENTER:
7999 	case '\r':
8000 	case KEY_BACKSPACE:
8001 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
8002 			struct tog_parent_tree *parent;
8003 			/* user selected '..' */
8004 			if (s->tree == s->root) {
8005 				view->count = 0;
8006 				break;
8007 			}
8008 			parent = TAILQ_FIRST(&s->parents);
8009 			TAILQ_REMOVE(&s->parents, parent,
8010 			    entry);
8011 			got_object_tree_close(s->tree);
8012 			s->tree = parent->tree;
8013 			s->first_displayed_entry =
8014 			    parent->first_displayed_entry;
8015 			s->selected_entry =
8016 			    parent->selected_entry;
8017 			s->selected = parent->selected;
8018 			if (s->selected > view->nlines - 3) {
8019 				err = offset_selection_down(view);
8020 				if (err)
8021 					break;
8022 			}
8023 			free(parent);
8024 		} else if (S_ISDIR(got_tree_entry_get_mode(
8025 		    s->selected_entry))) {
8026 			struct got_tree_object *subtree;
8027 			view->count = 0;
8028 			err = got_object_open_as_tree(&subtree, s->repo,
8029 			    got_tree_entry_get_id(s->selected_entry));
8030 			if (err)
8031 				break;
8032 			err = tree_view_visit_subtree(s, subtree);
8033 			if (err) {
8034 				got_object_tree_close(subtree);
8035 				break;
8036 			}
8037 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8038 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8039 		break;
8040 	case KEY_RESIZE:
8041 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8042 			s->selected = view->nlines - 4;
8043 		view->count = 0;
8044 		break;
8045 	default:
8046 		view->count = 0;
8047 		break;
8048 	}
8049 
8050 	return err;
8051 }
8052 
8053 __dead static void
8054 usage_tree(void)
8055 {
8056 	endwin();
8057 	fprintf(stderr,
8058 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8059 	    getprogname());
8060 	exit(1);
8061 }
8062 
8063 static const struct got_error *
8064 cmd_tree(int argc, char *argv[])
8065 {
8066 	const struct got_error *error;
8067 	struct got_repository *repo = NULL;
8068 	struct got_worktree *worktree = NULL;
8069 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8070 	struct got_object_id *commit_id = NULL;
8071 	struct got_commit_object *commit = NULL;
8072 	const char *commit_id_arg = NULL;
8073 	char *keyword_idstr = NULL, *label = NULL;
8074 	struct got_reference *ref = NULL;
8075 	const char *head_ref_name = NULL;
8076 	int ch;
8077 	struct tog_view *view;
8078 	int *pack_fds = NULL;
8079 
8080 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8081 		switch (ch) {
8082 		case 'c':
8083 			commit_id_arg = optarg;
8084 			break;
8085 		case 'r':
8086 			repo_path = realpath(optarg, NULL);
8087 			if (repo_path == NULL)
8088 				return got_error_from_errno2("realpath",
8089 				    optarg);
8090 			break;
8091 		default:
8092 			usage_tree();
8093 			/* NOTREACHED */
8094 		}
8095 	}
8096 
8097 	argc -= optind;
8098 	argv += optind;
8099 
8100 	if (argc > 1)
8101 		usage_tree();
8102 
8103 	error = got_repo_pack_fds_open(&pack_fds);
8104 	if (error != NULL)
8105 		goto done;
8106 
8107 	if (repo_path == NULL) {
8108 		cwd = getcwd(NULL, 0);
8109 		if (cwd == NULL)
8110 			return got_error_from_errno("getcwd");
8111 		error = got_worktree_open(&worktree, cwd, NULL);
8112 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8113 			goto done;
8114 		if (worktree)
8115 			repo_path =
8116 			    strdup(got_worktree_get_repo_path(worktree));
8117 		else
8118 			repo_path = strdup(cwd);
8119 		if (repo_path == NULL) {
8120 			error = got_error_from_errno("strdup");
8121 			goto done;
8122 		}
8123 	}
8124 
8125 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8126 	if (error != NULL)
8127 		goto done;
8128 
8129 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8130 	    repo, worktree);
8131 	if (error)
8132 		goto done;
8133 
8134 	init_curses();
8135 
8136 	error = apply_unveil(got_repo_get_path(repo), NULL);
8137 	if (error)
8138 		goto done;
8139 
8140 	error = tog_load_refs(repo, 0);
8141 	if (error)
8142 		goto done;
8143 
8144 	if (commit_id_arg == NULL) {
8145 		error = got_repo_match_object_id(&commit_id, &label,
8146 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8147 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8148 		if (error)
8149 			goto done;
8150 		head_ref_name = label;
8151 	} else {
8152 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8153 		    repo, worktree);
8154 		if (error != NULL)
8155 			goto done;
8156 		if (keyword_idstr != NULL)
8157 			commit_id_arg = keyword_idstr;
8158 
8159 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8160 		if (error == NULL)
8161 			head_ref_name = got_ref_get_name(ref);
8162 		else if (error->code != GOT_ERR_NOT_REF)
8163 			goto done;
8164 		error = got_repo_match_object_id(&commit_id, NULL,
8165 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8166 		if (error)
8167 			goto done;
8168 	}
8169 
8170 	error = got_object_open_as_commit(&commit, repo, commit_id);
8171 	if (error)
8172 		goto done;
8173 
8174 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8175 	if (view == NULL) {
8176 		error = got_error_from_errno("view_open");
8177 		goto done;
8178 	}
8179 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8180 	if (error)
8181 		goto done;
8182 	if (!got_path_is_root_dir(in_repo_path)) {
8183 		error = tree_view_walk_path(&view->state.tree, commit,
8184 		    in_repo_path);
8185 		if (error)
8186 			goto done;
8187 	}
8188 
8189 	if (worktree) {
8190 		/* Release work tree lock. */
8191 		got_worktree_close(worktree);
8192 		worktree = NULL;
8193 	}
8194 	error = view_loop(view);
8195 done:
8196 	free(keyword_idstr);
8197 	free(repo_path);
8198 	free(cwd);
8199 	free(commit_id);
8200 	free(label);
8201 	if (ref)
8202 		got_ref_close(ref);
8203 	if (repo) {
8204 		const struct got_error *close_err = got_repo_close(repo);
8205 		if (error == NULL)
8206 			error = close_err;
8207 	}
8208 	if (pack_fds) {
8209 		const struct got_error *pack_err =
8210 		    got_repo_pack_fds_close(pack_fds);
8211 		if (error == NULL)
8212 			error = pack_err;
8213 	}
8214 	tog_free_refs();
8215 	return error;
8216 }
8217 
8218 static const struct got_error *
8219 ref_view_load_refs(struct tog_ref_view_state *s)
8220 {
8221 	struct got_reflist_entry *sre;
8222 	struct tog_reflist_entry *re;
8223 
8224 	s->nrefs = 0;
8225 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8226 		if (strncmp(got_ref_get_name(sre->ref),
8227 		    "refs/got/", 9) == 0 &&
8228 		    strncmp(got_ref_get_name(sre->ref),
8229 		    "refs/got/backup/", 16) != 0)
8230 			continue;
8231 
8232 		re = malloc(sizeof(*re));
8233 		if (re == NULL)
8234 			return got_error_from_errno("malloc");
8235 
8236 		re->ref = got_ref_dup(sre->ref);
8237 		if (re->ref == NULL)
8238 			return got_error_from_errno("got_ref_dup");
8239 		re->idx = s->nrefs++;
8240 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8241 	}
8242 
8243 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8244 	return NULL;
8245 }
8246 
8247 static void
8248 ref_view_free_refs(struct tog_ref_view_state *s)
8249 {
8250 	struct tog_reflist_entry *re;
8251 
8252 	while (!TAILQ_EMPTY(&s->refs)) {
8253 		re = TAILQ_FIRST(&s->refs);
8254 		TAILQ_REMOVE(&s->refs, re, entry);
8255 		got_ref_close(re->ref);
8256 		free(re);
8257 	}
8258 }
8259 
8260 static const struct got_error *
8261 open_ref_view(struct tog_view *view, struct got_repository *repo)
8262 {
8263 	const struct got_error *err = NULL;
8264 	struct tog_ref_view_state *s = &view->state.ref;
8265 
8266 	s->selected_entry = 0;
8267 	s->repo = repo;
8268 
8269 	TAILQ_INIT(&s->refs);
8270 	STAILQ_INIT(&s->colors);
8271 
8272 	err = ref_view_load_refs(s);
8273 	if (err)
8274 		goto done;
8275 
8276 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8277 		err = add_color(&s->colors, "^refs/heads/",
8278 		    TOG_COLOR_REFS_HEADS,
8279 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8280 		if (err)
8281 			goto done;
8282 
8283 		err = add_color(&s->colors, "^refs/tags/",
8284 		    TOG_COLOR_REFS_TAGS,
8285 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8286 		if (err)
8287 			goto done;
8288 
8289 		err = add_color(&s->colors, "^refs/remotes/",
8290 		    TOG_COLOR_REFS_REMOTES,
8291 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8292 		if (err)
8293 			goto done;
8294 
8295 		err = add_color(&s->colors, "^refs/got/backup/",
8296 		    TOG_COLOR_REFS_BACKUP,
8297 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8298 		if (err)
8299 			goto done;
8300 	}
8301 
8302 	view->show = show_ref_view;
8303 	view->input = input_ref_view;
8304 	view->close = close_ref_view;
8305 	view->search_start = search_start_ref_view;
8306 	view->search_next = search_next_ref_view;
8307 done:
8308 	if (err) {
8309 		if (view->close == NULL)
8310 			close_ref_view(view);
8311 		view_close(view);
8312 	}
8313 	return err;
8314 }
8315 
8316 static const struct got_error *
8317 close_ref_view(struct tog_view *view)
8318 {
8319 	struct tog_ref_view_state *s = &view->state.ref;
8320 
8321 	ref_view_free_refs(s);
8322 	free_colors(&s->colors);
8323 
8324 	return NULL;
8325 }
8326 
8327 static const struct got_error *
8328 resolve_reflist_entry(struct got_object_id **commit_id,
8329     struct tog_reflist_entry *re, struct got_repository *repo)
8330 {
8331 	const struct got_error *err = NULL;
8332 	struct got_object_id *obj_id;
8333 	struct got_tag_object *tag = NULL;
8334 	int obj_type;
8335 
8336 	*commit_id = NULL;
8337 
8338 	err = got_ref_resolve(&obj_id, repo, re->ref);
8339 	if (err)
8340 		return err;
8341 
8342 	err = got_object_get_type(&obj_type, repo, obj_id);
8343 	if (err)
8344 		goto done;
8345 
8346 	switch (obj_type) {
8347 	case GOT_OBJ_TYPE_COMMIT:
8348 		*commit_id = obj_id;
8349 		break;
8350 	case GOT_OBJ_TYPE_TAG:
8351 		err = got_object_open_as_tag(&tag, repo, obj_id);
8352 		if (err)
8353 			goto done;
8354 		free(obj_id);
8355 		err = got_object_get_type(&obj_type, repo,
8356 		    got_object_tag_get_object_id(tag));
8357 		if (err)
8358 			goto done;
8359 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8360 			err = got_error(GOT_ERR_OBJ_TYPE);
8361 			goto done;
8362 		}
8363 		*commit_id = got_object_id_dup(
8364 		    got_object_tag_get_object_id(tag));
8365 		if (*commit_id == NULL) {
8366 			err = got_error_from_errno("got_object_id_dup");
8367 			goto done;
8368 		}
8369 		break;
8370 	default:
8371 		err = got_error(GOT_ERR_OBJ_TYPE);
8372 		break;
8373 	}
8374 
8375 done:
8376 	if (tag)
8377 		got_object_tag_close(tag);
8378 	if (err) {
8379 		free(*commit_id);
8380 		*commit_id = NULL;
8381 	}
8382 	return err;
8383 }
8384 
8385 static const struct got_error *
8386 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8387     struct tog_reflist_entry *re, struct got_repository *repo)
8388 {
8389 	struct tog_view *log_view;
8390 	const struct got_error *err = NULL;
8391 	struct got_object_id *commit_id = NULL;
8392 
8393 	*new_view = NULL;
8394 
8395 	err = resolve_reflist_entry(&commit_id, re, repo);
8396 	if (err) {
8397 		if (err->code != GOT_ERR_OBJ_TYPE)
8398 			return err;
8399 		else
8400 			return NULL;
8401 	}
8402 
8403 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8404 	if (log_view == NULL) {
8405 		err = got_error_from_errno("view_open");
8406 		goto done;
8407 	}
8408 
8409 	err = open_log_view(log_view, commit_id, repo,
8410 	    got_ref_get_name(re->ref), "", 0);
8411 done:
8412 	if (err)
8413 		view_close(log_view);
8414 	else
8415 		*new_view = log_view;
8416 	free(commit_id);
8417 	return err;
8418 }
8419 
8420 static void
8421 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8422 {
8423 	struct tog_reflist_entry *re;
8424 	int i = 0;
8425 
8426 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8427 		return;
8428 
8429 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8430 	while (i++ < maxscroll) {
8431 		if (re == NULL)
8432 			break;
8433 		s->first_displayed_entry = re;
8434 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8435 	}
8436 }
8437 
8438 static const struct got_error *
8439 ref_scroll_down(struct tog_view *view, int maxscroll)
8440 {
8441 	struct tog_ref_view_state *s = &view->state.ref;
8442 	struct tog_reflist_entry *next, *last;
8443 	int n = 0;
8444 
8445 	if (s->first_displayed_entry)
8446 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8447 	else
8448 		next = TAILQ_FIRST(&s->refs);
8449 
8450 	last = s->last_displayed_entry;
8451 	while (next && n++ < maxscroll) {
8452 		if (last) {
8453 			s->last_displayed_entry = last;
8454 			last = TAILQ_NEXT(last, entry);
8455 		}
8456 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8457 			s->first_displayed_entry = next;
8458 			next = TAILQ_NEXT(next, entry);
8459 		}
8460 	}
8461 
8462 	return NULL;
8463 }
8464 
8465 static const struct got_error *
8466 search_start_ref_view(struct tog_view *view)
8467 {
8468 	struct tog_ref_view_state *s = &view->state.ref;
8469 
8470 	s->matched_entry = NULL;
8471 	return NULL;
8472 }
8473 
8474 static int
8475 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8476 {
8477 	regmatch_t regmatch;
8478 
8479 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8480 	    0) == 0;
8481 }
8482 
8483 static const struct got_error *
8484 search_next_ref_view(struct tog_view *view)
8485 {
8486 	struct tog_ref_view_state *s = &view->state.ref;
8487 	struct tog_reflist_entry *re = NULL;
8488 
8489 	if (!view->searching) {
8490 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8491 		return NULL;
8492 	}
8493 
8494 	if (s->matched_entry) {
8495 		if (view->searching == TOG_SEARCH_FORWARD) {
8496 			if (s->selected_entry)
8497 				re = TAILQ_NEXT(s->selected_entry, entry);
8498 			else
8499 				re = TAILQ_PREV(s->selected_entry,
8500 				    tog_reflist_head, entry);
8501 		} else {
8502 			if (s->selected_entry == NULL)
8503 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8504 			else
8505 				re = TAILQ_PREV(s->selected_entry,
8506 				    tog_reflist_head, entry);
8507 		}
8508 	} else {
8509 		if (s->selected_entry)
8510 			re = s->selected_entry;
8511 		else if (view->searching == TOG_SEARCH_FORWARD)
8512 			re = TAILQ_FIRST(&s->refs);
8513 		else
8514 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8515 	}
8516 
8517 	while (1) {
8518 		if (re == NULL) {
8519 			if (s->matched_entry == NULL) {
8520 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8521 				return NULL;
8522 			}
8523 			if (view->searching == TOG_SEARCH_FORWARD)
8524 				re = TAILQ_FIRST(&s->refs);
8525 			else
8526 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8527 		}
8528 
8529 		if (match_reflist_entry(re, &view->regex)) {
8530 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8531 			s->matched_entry = re;
8532 			break;
8533 		}
8534 
8535 		if (view->searching == TOG_SEARCH_FORWARD)
8536 			re = TAILQ_NEXT(re, entry);
8537 		else
8538 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8539 	}
8540 
8541 	if (s->matched_entry) {
8542 		s->first_displayed_entry = s->matched_entry;
8543 		s->selected = 0;
8544 	}
8545 
8546 	return NULL;
8547 }
8548 
8549 static const struct got_error *
8550 show_ref_view(struct tog_view *view)
8551 {
8552 	const struct got_error *err = NULL;
8553 	struct tog_ref_view_state *s = &view->state.ref;
8554 	struct tog_reflist_entry *re;
8555 	char *line = NULL;
8556 	wchar_t *wline;
8557 	struct tog_color *tc;
8558 	int width, n, scrollx;
8559 	int limit = view->nlines;
8560 
8561 	werase(view->window);
8562 
8563 	s->ndisplayed = 0;
8564 	if (view_is_hsplit_top(view))
8565 		--limit;  /* border */
8566 
8567 	if (limit == 0)
8568 		return NULL;
8569 
8570 	re = s->first_displayed_entry;
8571 
8572 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8573 	    s->nrefs) == -1)
8574 		return got_error_from_errno("asprintf");
8575 
8576 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8577 	if (err) {
8578 		free(line);
8579 		return err;
8580 	}
8581 	if (view_needs_focus_indication(view))
8582 		wstandout(view->window);
8583 	waddwstr(view->window, wline);
8584 	while (width++ < view->ncols)
8585 		waddch(view->window, ' ');
8586 	if (view_needs_focus_indication(view))
8587 		wstandend(view->window);
8588 	free(wline);
8589 	wline = NULL;
8590 	free(line);
8591 	line = NULL;
8592 	if (--limit <= 0)
8593 		return NULL;
8594 
8595 	n = 0;
8596 	view->maxx = 0;
8597 	while (re && limit > 0) {
8598 		char *line = NULL;
8599 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8600 
8601 		if (s->show_date) {
8602 			struct got_commit_object *ci;
8603 			struct got_tag_object *tag;
8604 			struct got_object_id *id;
8605 			struct tm tm;
8606 			time_t t;
8607 
8608 			err = got_ref_resolve(&id, s->repo, re->ref);
8609 			if (err)
8610 				return err;
8611 			err = got_object_open_as_tag(&tag, s->repo, id);
8612 			if (err) {
8613 				if (err->code != GOT_ERR_OBJ_TYPE) {
8614 					free(id);
8615 					return err;
8616 				}
8617 				err = got_object_open_as_commit(&ci, s->repo,
8618 				    id);
8619 				if (err) {
8620 					free(id);
8621 					return err;
8622 				}
8623 				t = got_object_commit_get_committer_time(ci);
8624 				got_object_commit_close(ci);
8625 			} else {
8626 				t = got_object_tag_get_tagger_time(tag);
8627 				got_object_tag_close(tag);
8628 			}
8629 			free(id);
8630 			if (gmtime_r(&t, &tm) == NULL)
8631 				return got_error_from_errno("gmtime_r");
8632 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8633 				return got_error(GOT_ERR_NO_SPACE);
8634 		}
8635 		if (got_ref_is_symbolic(re->ref)) {
8636 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8637 			    ymd : "", got_ref_get_name(re->ref),
8638 			    got_ref_get_symref_target(re->ref)) == -1)
8639 				return got_error_from_errno("asprintf");
8640 		} else if (s->show_ids) {
8641 			struct got_object_id *id;
8642 			char *id_str;
8643 			err = got_ref_resolve(&id, s->repo, re->ref);
8644 			if (err)
8645 				return err;
8646 			err = got_object_id_str(&id_str, id);
8647 			if (err) {
8648 				free(id);
8649 				return err;
8650 			}
8651 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8652 			    got_ref_get_name(re->ref), id_str) == -1) {
8653 				err = got_error_from_errno("asprintf");
8654 				free(id);
8655 				free(id_str);
8656 				return err;
8657 			}
8658 			free(id);
8659 			free(id_str);
8660 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8661 		    got_ref_get_name(re->ref)) == -1)
8662 			return got_error_from_errno("asprintf");
8663 
8664 		/* use full line width to determine view->maxx */
8665 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8666 		if (err) {
8667 			free(line);
8668 			return err;
8669 		}
8670 		view->maxx = MAX(view->maxx, width);
8671 		free(wline);
8672 		wline = NULL;
8673 
8674 		err = format_line(&wline, &width, &scrollx, line, view->x,
8675 		    view->ncols, 0, 0);
8676 		if (err) {
8677 			free(line);
8678 			return err;
8679 		}
8680 		if (n == s->selected) {
8681 			if (view->focussed)
8682 				wstandout(view->window);
8683 			s->selected_entry = re;
8684 		}
8685 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8686 		if (tc)
8687 			wattr_on(view->window,
8688 			    COLOR_PAIR(tc->colorpair), NULL);
8689 		waddwstr(view->window, &wline[scrollx]);
8690 		if (tc)
8691 			wattr_off(view->window,
8692 			    COLOR_PAIR(tc->colorpair), NULL);
8693 		if (width < view->ncols)
8694 			waddch(view->window, '\n');
8695 		if (n == s->selected && view->focussed)
8696 			wstandend(view->window);
8697 		free(line);
8698 		free(wline);
8699 		wline = NULL;
8700 		n++;
8701 		s->ndisplayed++;
8702 		s->last_displayed_entry = re;
8703 
8704 		limit--;
8705 		re = TAILQ_NEXT(re, entry);
8706 	}
8707 
8708 	view_border(view);
8709 	return err;
8710 }
8711 
8712 static const struct got_error *
8713 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8714     struct tog_reflist_entry *re, struct got_repository *repo)
8715 {
8716 	const struct got_error *err = NULL;
8717 	struct got_object_id *commit_id = NULL;
8718 	struct tog_view *tree_view;
8719 
8720 	*new_view = NULL;
8721 
8722 	err = resolve_reflist_entry(&commit_id, re, repo);
8723 	if (err) {
8724 		if (err->code != GOT_ERR_OBJ_TYPE)
8725 			return err;
8726 		else
8727 			return NULL;
8728 	}
8729 
8730 
8731 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8732 	if (tree_view == NULL) {
8733 		err = got_error_from_errno("view_open");
8734 		goto done;
8735 	}
8736 
8737 	err = open_tree_view(tree_view, commit_id,
8738 	    got_ref_get_name(re->ref), repo);
8739 	if (err)
8740 		goto done;
8741 
8742 	*new_view = tree_view;
8743 done:
8744 	free(commit_id);
8745 	return err;
8746 }
8747 
8748 static const struct got_error *
8749 ref_goto_line(struct tog_view *view, int nlines)
8750 {
8751 	const struct got_error		*err = NULL;
8752 	struct tog_ref_view_state	*s = &view->state.ref;
8753 	int				 g, idx = s->selected_entry->idx;
8754 
8755 	g = view->gline;
8756 	view->gline = 0;
8757 
8758 	if (g == 0)
8759 		g = 1;
8760 	else if (g > s->nrefs)
8761 		g = s->nrefs;
8762 
8763 	if (g >= s->first_displayed_entry->idx + 1 &&
8764 	    g <= s->last_displayed_entry->idx + 1 &&
8765 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8766 		s->selected = g - s->first_displayed_entry->idx - 1;
8767 		return NULL;
8768 	}
8769 
8770 	if (idx + 1 < g) {
8771 		err = ref_scroll_down(view, g - idx - 1);
8772 		if (err)
8773 			return err;
8774 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8775 		    s->first_displayed_entry->idx + s->selected < g &&
8776 		    s->selected < s->ndisplayed - 1)
8777 			s->selected = g - s->first_displayed_entry->idx - 1;
8778 	} else if (idx + 1 > g)
8779 		ref_scroll_up(s, idx - g + 1);
8780 
8781 	if (g < nlines && s->first_displayed_entry->idx == 0)
8782 		s->selected = g - 1;
8783 
8784 	return NULL;
8785 
8786 }
8787 
8788 static const struct got_error *
8789 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8790 {
8791 	const struct got_error *err = NULL;
8792 	struct tog_ref_view_state *s = &view->state.ref;
8793 	struct tog_reflist_entry *re;
8794 	int n, nscroll = view->nlines - 1;
8795 
8796 	if (view->gline)
8797 		return ref_goto_line(view, nscroll);
8798 
8799 	switch (ch) {
8800 	case '0':
8801 	case '$':
8802 	case KEY_RIGHT:
8803 	case 'l':
8804 	case KEY_LEFT:
8805 	case 'h':
8806 		horizontal_scroll_input(view, ch);
8807 		break;
8808 	case 'i':
8809 		s->show_ids = !s->show_ids;
8810 		view->count = 0;
8811 		break;
8812 	case 'm':
8813 		s->show_date = !s->show_date;
8814 		view->count = 0;
8815 		break;
8816 	case 'o':
8817 		s->sort_by_date = !s->sort_by_date;
8818 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8819 		view->count = 0;
8820 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8821 		    got_ref_cmp_by_commit_timestamp_descending :
8822 		    tog_ref_cmp_by_name, s->repo);
8823 		if (err)
8824 			break;
8825 		got_reflist_object_id_map_free(tog_refs_idmap);
8826 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8827 		    &tog_refs, s->repo);
8828 		if (err)
8829 			break;
8830 		ref_view_free_refs(s);
8831 		err = ref_view_load_refs(s);
8832 		break;
8833 	case KEY_ENTER:
8834 	case '\r':
8835 		view->count = 0;
8836 		if (!s->selected_entry)
8837 			break;
8838 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8839 		break;
8840 	case 'T':
8841 		view->count = 0;
8842 		if (!s->selected_entry)
8843 			break;
8844 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8845 		break;
8846 	case 'g':
8847 	case '=':
8848 	case KEY_HOME:
8849 		s->selected = 0;
8850 		view->count = 0;
8851 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8852 		break;
8853 	case 'G':
8854 	case '*':
8855 	case KEY_END: {
8856 		int eos = view->nlines - 1;
8857 
8858 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8859 			--eos;  /* border */
8860 		s->selected = 0;
8861 		view->count = 0;
8862 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8863 		for (n = 0; n < eos; n++) {
8864 			if (re == NULL)
8865 				break;
8866 			s->first_displayed_entry = re;
8867 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8868 		}
8869 		if (n > 0)
8870 			s->selected = n - 1;
8871 		break;
8872 	}
8873 	case 'k':
8874 	case KEY_UP:
8875 	case CTRL('p'):
8876 		if (s->selected > 0) {
8877 			s->selected--;
8878 			break;
8879 		}
8880 		ref_scroll_up(s, 1);
8881 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8882 			view->count = 0;
8883 		break;
8884 	case CTRL('u'):
8885 	case 'u':
8886 		nscroll /= 2;
8887 		/* FALL THROUGH */
8888 	case KEY_PPAGE:
8889 	case CTRL('b'):
8890 	case 'b':
8891 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8892 			s->selected -= MIN(nscroll, s->selected);
8893 		ref_scroll_up(s, MAX(0, nscroll));
8894 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8895 			view->count = 0;
8896 		break;
8897 	case 'j':
8898 	case KEY_DOWN:
8899 	case CTRL('n'):
8900 		if (s->selected < s->ndisplayed - 1) {
8901 			s->selected++;
8902 			break;
8903 		}
8904 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8905 			/* can't scroll any further */
8906 			view->count = 0;
8907 			break;
8908 		}
8909 		ref_scroll_down(view, 1);
8910 		break;
8911 	case CTRL('d'):
8912 	case 'd':
8913 		nscroll /= 2;
8914 		/* FALL THROUGH */
8915 	case KEY_NPAGE:
8916 	case CTRL('f'):
8917 	case 'f':
8918 	case ' ':
8919 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8920 			/* can't scroll any further; move cursor down */
8921 			if (s->selected < s->ndisplayed - 1)
8922 				s->selected += MIN(nscroll,
8923 				    s->ndisplayed - s->selected - 1);
8924 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8925 				s->selected += s->ndisplayed - s->selected - 1;
8926 			view->count = 0;
8927 			break;
8928 		}
8929 		ref_scroll_down(view, nscroll);
8930 		break;
8931 	case CTRL('l'):
8932 		view->count = 0;
8933 		tog_free_refs();
8934 		err = tog_load_refs(s->repo, s->sort_by_date);
8935 		if (err)
8936 			break;
8937 		ref_view_free_refs(s);
8938 		err = ref_view_load_refs(s);
8939 		break;
8940 	case KEY_RESIZE:
8941 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8942 			s->selected = view->nlines - 2;
8943 		break;
8944 	default:
8945 		view->count = 0;
8946 		break;
8947 	}
8948 
8949 	return err;
8950 }
8951 
8952 __dead static void
8953 usage_ref(void)
8954 {
8955 	endwin();
8956 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8957 	    getprogname());
8958 	exit(1);
8959 }
8960 
8961 static const struct got_error *
8962 cmd_ref(int argc, char *argv[])
8963 {
8964 	const struct got_error *error;
8965 	struct got_repository *repo = NULL;
8966 	struct got_worktree *worktree = NULL;
8967 	char *cwd = NULL, *repo_path = NULL;
8968 	int ch;
8969 	struct tog_view *view;
8970 	int *pack_fds = NULL;
8971 
8972 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8973 		switch (ch) {
8974 		case 'r':
8975 			repo_path = realpath(optarg, NULL);
8976 			if (repo_path == NULL)
8977 				return got_error_from_errno2("realpath",
8978 				    optarg);
8979 			break;
8980 		default:
8981 			usage_ref();
8982 			/* NOTREACHED */
8983 		}
8984 	}
8985 
8986 	argc -= optind;
8987 	argv += optind;
8988 
8989 	if (argc > 1)
8990 		usage_ref();
8991 
8992 	error = got_repo_pack_fds_open(&pack_fds);
8993 	if (error != NULL)
8994 		goto done;
8995 
8996 	if (repo_path == NULL) {
8997 		cwd = getcwd(NULL, 0);
8998 		if (cwd == NULL)
8999 			return got_error_from_errno("getcwd");
9000 		error = got_worktree_open(&worktree, cwd, NULL);
9001 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
9002 			goto done;
9003 		if (worktree)
9004 			repo_path =
9005 			    strdup(got_worktree_get_repo_path(worktree));
9006 		else
9007 			repo_path = strdup(cwd);
9008 		if (repo_path == NULL) {
9009 			error = got_error_from_errno("strdup");
9010 			goto done;
9011 		}
9012 	}
9013 
9014 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9015 	if (error != NULL)
9016 		goto done;
9017 
9018 	init_curses();
9019 
9020 	error = apply_unveil(got_repo_get_path(repo), NULL);
9021 	if (error)
9022 		goto done;
9023 
9024 	error = tog_load_refs(repo, 0);
9025 	if (error)
9026 		goto done;
9027 
9028 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9029 	if (view == NULL) {
9030 		error = got_error_from_errno("view_open");
9031 		goto done;
9032 	}
9033 
9034 	error = open_ref_view(view, repo);
9035 	if (error)
9036 		goto done;
9037 
9038 	if (worktree) {
9039 		/* Release work tree lock. */
9040 		got_worktree_close(worktree);
9041 		worktree = NULL;
9042 	}
9043 	error = view_loop(view);
9044 done:
9045 	free(repo_path);
9046 	free(cwd);
9047 	if (repo) {
9048 		const struct got_error *close_err = got_repo_close(repo);
9049 		if (close_err)
9050 			error = close_err;
9051 	}
9052 	if (pack_fds) {
9053 		const struct got_error *pack_err =
9054 		    got_repo_pack_fds_close(pack_fds);
9055 		if (error == NULL)
9056 			error = pack_err;
9057 	}
9058 	tog_free_refs();
9059 	return error;
9060 }
9061 
9062 static const struct got_error*
9063 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9064     const char *str)
9065 {
9066 	size_t len;
9067 
9068 	if (win == NULL)
9069 		win = stdscr;
9070 
9071 	len = strlen(str);
9072 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9073 
9074 	if (focus)
9075 		wstandout(win);
9076 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9077 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9078 	if (focus)
9079 		wstandend(win);
9080 
9081 	return NULL;
9082 }
9083 
9084 static const struct got_error *
9085 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9086 {
9087 	off_t *p;
9088 
9089 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9090 	if (p == NULL) {
9091 		free(*line_offsets);
9092 		*line_offsets = NULL;
9093 		return got_error_from_errno("reallocarray");
9094 	}
9095 
9096 	*line_offsets = p;
9097 	(*line_offsets)[*nlines] = off;
9098 	++(*nlines);
9099 	return NULL;
9100 }
9101 
9102 static const struct got_error *
9103 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9104 {
9105 	*ret = 0;
9106 
9107 	for (;n > 0; --n, ++km) {
9108 		char	*t0, *t, *k;
9109 		size_t	 len = 1;
9110 
9111 		if (km->keys == NULL)
9112 			continue;
9113 
9114 		t = t0 = strdup(km->keys);
9115 		if (t0 == NULL)
9116 			return got_error_from_errno("strdup");
9117 
9118 		len += strlen(t);
9119 		while ((k = strsep(&t, " ")) != NULL)
9120 			len += strlen(k) > 1 ? 2 : 0;
9121 		free(t0);
9122 		*ret = MAX(*ret, len);
9123 	}
9124 
9125 	return NULL;
9126 }
9127 
9128 /*
9129  * Write keymap section headers, keys, and key info in km to f.
9130  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9131  * wrap control and symbolic keys in guillemets, else use <>.
9132  */
9133 static const struct got_error *
9134 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9135 {
9136 	int n, len = width;
9137 
9138 	if (km->keys) {
9139 		static const char *u8_glyph[] = {
9140 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9141 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9142 		};
9143 		char	*t0, *t, *k;
9144 		int	 cs, s, first = 1;
9145 
9146 		cs = got_locale_is_utf8();
9147 
9148 		t = t0 = strdup(km->keys);
9149 		if (t0 == NULL)
9150 			return got_error_from_errno("strdup");
9151 
9152 		len = strlen(km->keys);
9153 		while ((k = strsep(&t, " ")) != NULL) {
9154 			s = strlen(k) > 1;  /* control or symbolic key */
9155 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9156 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9157 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9158 			if (n < 0) {
9159 				free(t0);
9160 				return got_error_from_errno("fprintf");
9161 			}
9162 			first = 0;
9163 			len += s ? 2 : 0;
9164 			*off += n;
9165 		}
9166 		free(t0);
9167 	}
9168 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9169 	if (n < 0)
9170 		return got_error_from_errno("fprintf");
9171 	*off += n;
9172 
9173 	return NULL;
9174 }
9175 
9176 static const struct got_error *
9177 format_help(struct tog_help_view_state *s)
9178 {
9179 	const struct got_error		*err = NULL;
9180 	off_t				 off = 0;
9181 	int				 i, max, n, show = s->all;
9182 	static const struct tog_key_map	 km[] = {
9183 #define KEYMAP_(info, type)	{ NULL, (info), type }
9184 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9185 		GENERATE_HELP
9186 #undef KEYMAP_
9187 #undef KEY_
9188 	};
9189 
9190 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9191 	if (err)
9192 		return err;
9193 
9194 	n = nitems(km);
9195 	err = max_key_str(&max, km, n);
9196 	if (err)
9197 		return err;
9198 
9199 	for (i = 0; i < n; ++i) {
9200 		if (km[i].keys == NULL) {
9201 			show = s->all;
9202 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9203 			    km[i].type == s->type || s->all)
9204 				show = 1;
9205 		}
9206 		if (show) {
9207 			err = format_help_line(&off, s->f, &km[i], max);
9208 			if (err)
9209 				return err;
9210 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9211 			if (err)
9212 				return err;
9213 		}
9214 	}
9215 	fputc('\n', s->f);
9216 	++off;
9217 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9218 	return err;
9219 }
9220 
9221 static const struct got_error *
9222 create_help(struct tog_help_view_state *s)
9223 {
9224 	FILE			*f;
9225 	const struct got_error	*err;
9226 
9227 	free(s->line_offsets);
9228 	s->line_offsets = NULL;
9229 	s->nlines = 0;
9230 
9231 	f = got_opentemp();
9232 	if (f == NULL)
9233 		return got_error_from_errno("got_opentemp");
9234 	s->f = f;
9235 
9236 	err = format_help(s);
9237 	if (err)
9238 		return err;
9239 
9240 	if (s->f && fflush(s->f) != 0)
9241 		return got_error_from_errno("fflush");
9242 
9243 	return NULL;
9244 }
9245 
9246 static const struct got_error *
9247 search_start_help_view(struct tog_view *view)
9248 {
9249 	view->state.help.matched_line = 0;
9250 	return NULL;
9251 }
9252 
9253 static void
9254 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9255     size_t *nlines, int **first, int **last, int **match, int **selected)
9256 {
9257 	struct tog_help_view_state *s = &view->state.help;
9258 
9259 	*f = s->f;
9260 	*nlines = s->nlines;
9261 	*line_offsets = s->line_offsets;
9262 	*match = &s->matched_line;
9263 	*first = &s->first_displayed_line;
9264 	*last = &s->last_displayed_line;
9265 	*selected = &s->selected_line;
9266 }
9267 
9268 static const struct got_error *
9269 show_help_view(struct tog_view *view)
9270 {
9271 	struct tog_help_view_state	*s = &view->state.help;
9272 	const struct got_error		*err;
9273 	regmatch_t			*regmatch = &view->regmatch;
9274 	wchar_t				*wline;
9275 	char				*line;
9276 	ssize_t				 linelen;
9277 	size_t				 linesz = 0;
9278 	int				 width, nprinted = 0, rc = 0;
9279 	int				 eos = view->nlines;
9280 
9281 	if (view_is_hsplit_top(view))
9282 		--eos;  /* account for border */
9283 
9284 	s->lineno = 0;
9285 	rewind(s->f);
9286 	werase(view->window);
9287 
9288 	if (view->gline > s->nlines - 1)
9289 		view->gline = s->nlines - 1;
9290 
9291 	err = win_draw_center(view->window, 0, 0, view->ncols,
9292 	    view_needs_focus_indication(view),
9293 	    "tog help (press q to return to tog)");
9294 	if (err)
9295 		return err;
9296 	if (eos <= 1)
9297 		return NULL;
9298 	waddstr(view->window, "\n\n");
9299 	eos -= 2;
9300 
9301 	s->eof = 0;
9302 	view->maxx = 0;
9303 	line = NULL;
9304 	while (eos > 0 && nprinted < eos) {
9305 		attr_t attr = 0;
9306 
9307 		linelen = getline(&line, &linesz, s->f);
9308 		if (linelen == -1) {
9309 			if (!feof(s->f)) {
9310 				free(line);
9311 				return got_ferror(s->f, GOT_ERR_IO);
9312 			}
9313 			s->eof = 1;
9314 			break;
9315 		}
9316 		if (++s->lineno < s->first_displayed_line)
9317 			continue;
9318 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9319 			continue;
9320 		if (s->lineno == view->hiline)
9321 			attr = A_STANDOUT;
9322 
9323 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9324 		    view->x ? 1 : 0);
9325 		if (err) {
9326 			free(line);
9327 			return err;
9328 		}
9329 		view->maxx = MAX(view->maxx, width);
9330 		free(wline);
9331 		wline = NULL;
9332 
9333 		if (attr)
9334 			wattron(view->window, attr);
9335 		if (s->first_displayed_line + nprinted == s->matched_line &&
9336 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9337 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9338 			    view->window, view->x, regmatch);
9339 			if (err) {
9340 				free(line);
9341 				return err;
9342 			}
9343 		} else {
9344 			int skip;
9345 
9346 			err = format_line(&wline, &width, &skip, line,
9347 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9348 			if (err) {
9349 				free(line);
9350 				return err;
9351 			}
9352 			waddwstr(view->window, &wline[skip]);
9353 			free(wline);
9354 			wline = NULL;
9355 		}
9356 		if (s->lineno == view->hiline) {
9357 			while (width++ < view->ncols)
9358 				waddch(view->window, ' ');
9359 		} else {
9360 			if (width < view->ncols)
9361 				waddch(view->window, '\n');
9362 		}
9363 		if (attr)
9364 			wattroff(view->window, attr);
9365 		if (++nprinted == 1)
9366 			s->first_displayed_line = s->lineno;
9367 	}
9368 	free(line);
9369 	if (nprinted > 0)
9370 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9371 	else
9372 		s->last_displayed_line = s->first_displayed_line;
9373 
9374 	view_border(view);
9375 
9376 	if (s->eof) {
9377 		rc = waddnstr(view->window,
9378 		    "See the tog(1) manual page for full documentation",
9379 		    view->ncols - 1);
9380 		if (rc == ERR)
9381 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9382 	} else {
9383 		wmove(view->window, view->nlines - 1, 0);
9384 		wclrtoeol(view->window);
9385 		wstandout(view->window);
9386 		rc = waddnstr(view->window, "scroll down for more...",
9387 		    view->ncols - 1);
9388 		if (rc == ERR)
9389 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9390 		if (getcurx(view->window) < view->ncols - 6) {
9391 			rc = wprintw(view->window, "[%.0f%%]",
9392 			    100.00 * s->last_displayed_line / s->nlines);
9393 			if (rc == ERR)
9394 				return got_error_msg(GOT_ERR_IO, "wprintw");
9395 		}
9396 		wstandend(view->window);
9397 	}
9398 
9399 	return NULL;
9400 }
9401 
9402 static const struct got_error *
9403 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9404 {
9405 	struct tog_help_view_state	*s = &view->state.help;
9406 	const struct got_error		*err = NULL;
9407 	char				*line = NULL;
9408 	ssize_t				 linelen;
9409 	size_t				 linesz = 0;
9410 	int				 eos, nscroll;
9411 
9412 	eos = nscroll = view->nlines;
9413 	if (view_is_hsplit_top(view))
9414 		--eos;  /* border */
9415 
9416 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9417 
9418 	switch (ch) {
9419 	case '0':
9420 	case '$':
9421 	case KEY_RIGHT:
9422 	case 'l':
9423 	case KEY_LEFT:
9424 	case 'h':
9425 		horizontal_scroll_input(view, ch);
9426 		break;
9427 	case 'g':
9428 	case KEY_HOME:
9429 		s->first_displayed_line = 1;
9430 		view->count = 0;
9431 		break;
9432 	case 'G':
9433 	case KEY_END:
9434 		view->count = 0;
9435 		if (s->eof)
9436 			break;
9437 		s->first_displayed_line = (s->nlines - eos) + 3;
9438 		s->eof = 1;
9439 		break;
9440 	case 'k':
9441 	case KEY_UP:
9442 		if (s->first_displayed_line > 1)
9443 			--s->first_displayed_line;
9444 		else
9445 			view->count = 0;
9446 		break;
9447 	case CTRL('u'):
9448 	case 'u':
9449 		nscroll /= 2;
9450 		/* FALL THROUGH */
9451 	case KEY_PPAGE:
9452 	case CTRL('b'):
9453 	case 'b':
9454 		if (s->first_displayed_line == 1) {
9455 			view->count = 0;
9456 			break;
9457 		}
9458 		while (--nscroll > 0 && s->first_displayed_line > 1)
9459 			s->first_displayed_line--;
9460 		break;
9461 	case 'j':
9462 	case KEY_DOWN:
9463 	case CTRL('n'):
9464 		if (!s->eof)
9465 			++s->first_displayed_line;
9466 		else
9467 			view->count = 0;
9468 		break;
9469 	case CTRL('d'):
9470 	case 'd':
9471 		nscroll /= 2;
9472 		/* FALL THROUGH */
9473 	case KEY_NPAGE:
9474 	case CTRL('f'):
9475 	case 'f':
9476 	case ' ':
9477 		if (s->eof) {
9478 			view->count = 0;
9479 			break;
9480 		}
9481 		while (!s->eof && --nscroll > 0) {
9482 			linelen = getline(&line, &linesz, s->f);
9483 			s->first_displayed_line++;
9484 			if (linelen == -1) {
9485 				if (feof(s->f))
9486 					s->eof = 1;
9487 				else
9488 					err = got_ferror(s->f, GOT_ERR_IO);
9489 				break;
9490 			}
9491 		}
9492 		free(line);
9493 		break;
9494 	default:
9495 		view->count = 0;
9496 		break;
9497 	}
9498 
9499 	return err;
9500 }
9501 
9502 static const struct got_error *
9503 close_help_view(struct tog_view *view)
9504 {
9505 	struct tog_help_view_state *s = &view->state.help;
9506 
9507 	free(s->line_offsets);
9508 	s->line_offsets = NULL;
9509 	if (fclose(s->f) == EOF)
9510 		return got_error_from_errno("fclose");
9511 
9512 	return NULL;
9513 }
9514 
9515 static const struct got_error *
9516 reset_help_view(struct tog_view *view)
9517 {
9518 	struct tog_help_view_state *s = &view->state.help;
9519 
9520 
9521 	if (s->f && fclose(s->f) == EOF)
9522 		return got_error_from_errno("fclose");
9523 
9524 	wclear(view->window);
9525 	view->count = 0;
9526 	view->x = 0;
9527 	s->all = !s->all;
9528 	s->first_displayed_line = 1;
9529 	s->last_displayed_line = view->nlines;
9530 	s->matched_line = 0;
9531 
9532 	return create_help(s);
9533 }
9534 
9535 static const struct got_error *
9536 open_help_view(struct tog_view *view, struct tog_view *parent)
9537 {
9538 	const struct got_error		*err = NULL;
9539 	struct tog_help_view_state	*s = &view->state.help;
9540 
9541 	s->type = (enum tog_keymap_type)parent->type;
9542 	s->first_displayed_line = 1;
9543 	s->last_displayed_line = view->nlines;
9544 	s->selected_line = 1;
9545 
9546 	view->show = show_help_view;
9547 	view->input = input_help_view;
9548 	view->reset = reset_help_view;
9549 	view->close = close_help_view;
9550 	view->search_start = search_start_help_view;
9551 	view->search_setup = search_setup_help_view;
9552 	view->search_next = search_next_view_match;
9553 
9554 	err = create_help(s);
9555 	return err;
9556 }
9557 
9558 static const struct got_error *
9559 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9560     enum tog_view_type request, int y, int x)
9561 {
9562 	const struct got_error *err = NULL;
9563 
9564 	*new_view = NULL;
9565 
9566 	switch (request) {
9567 	case TOG_VIEW_DIFF:
9568 		if (view->type == TOG_VIEW_LOG) {
9569 			struct tog_log_view_state *s = &view->state.log;
9570 
9571 			err = open_diff_view_for_commit(new_view, y, x,
9572 			    s->selected_entry->commit, s->selected_entry->id,
9573 			    view, s->repo);
9574 		} else
9575 			return got_error_msg(GOT_ERR_NOT_IMPL,
9576 			    "parent/child view pair not supported");
9577 		break;
9578 	case TOG_VIEW_BLAME:
9579 		if (view->type == TOG_VIEW_TREE) {
9580 			struct tog_tree_view_state *s = &view->state.tree;
9581 
9582 			err = blame_tree_entry(new_view, y, x,
9583 			    s->selected_entry, &s->parents, s->commit_id,
9584 			    s->repo);
9585 		} else
9586 			return got_error_msg(GOT_ERR_NOT_IMPL,
9587 			    "parent/child view pair not supported");
9588 		break;
9589 	case TOG_VIEW_LOG:
9590 		if (view->type == TOG_VIEW_BLAME)
9591 			err = log_annotated_line(new_view, y, x,
9592 			    view->state.blame.repo, view->state.blame.id_to_log);
9593 		else if (view->type == TOG_VIEW_TREE)
9594 			err = log_selected_tree_entry(new_view, y, x,
9595 			    &view->state.tree);
9596 		else if (view->type == TOG_VIEW_REF)
9597 			err = log_ref_entry(new_view, y, x,
9598 			    view->state.ref.selected_entry,
9599 			    view->state.ref.repo);
9600 		else
9601 			return got_error_msg(GOT_ERR_NOT_IMPL,
9602 			    "parent/child view pair not supported");
9603 		break;
9604 	case TOG_VIEW_TREE:
9605 		if (view->type == TOG_VIEW_LOG)
9606 			err = browse_commit_tree(new_view, y, x,
9607 			    view->state.log.selected_entry,
9608 			    view->state.log.in_repo_path,
9609 			    view->state.log.head_ref_name,
9610 			    view->state.log.repo);
9611 		else if (view->type == TOG_VIEW_REF)
9612 			err = browse_ref_tree(new_view, y, x,
9613 			    view->state.ref.selected_entry,
9614 			    view->state.ref.repo);
9615 		else
9616 			return got_error_msg(GOT_ERR_NOT_IMPL,
9617 			    "parent/child view pair not supported");
9618 		break;
9619 	case TOG_VIEW_REF:
9620 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9621 		if (*new_view == NULL)
9622 			return got_error_from_errno("view_open");
9623 		if (view->type == TOG_VIEW_LOG)
9624 			err = open_ref_view(*new_view, view->state.log.repo);
9625 		else if (view->type == TOG_VIEW_TREE)
9626 			err = open_ref_view(*new_view, view->state.tree.repo);
9627 		else
9628 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9629 			    "parent/child view pair not supported");
9630 		if (err)
9631 			view_close(*new_view);
9632 		break;
9633 	case TOG_VIEW_HELP:
9634 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9635 		if (*new_view == NULL)
9636 			return got_error_from_errno("view_open");
9637 		err = open_help_view(*new_view, view);
9638 		if (err)
9639 			view_close(*new_view);
9640 		break;
9641 	default:
9642 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9643 	}
9644 
9645 	return err;
9646 }
9647 
9648 /*
9649  * If view was scrolled down to move the selected line into view when opening a
9650  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9651  */
9652 static void
9653 offset_selection_up(struct tog_view *view)
9654 {
9655 	switch (view->type) {
9656 	case TOG_VIEW_BLAME: {
9657 		struct tog_blame_view_state *s = &view->state.blame;
9658 		if (s->first_displayed_line == 1) {
9659 			s->selected_line = MAX(s->selected_line - view->offset,
9660 			    1);
9661 			break;
9662 		}
9663 		if (s->first_displayed_line > view->offset)
9664 			s->first_displayed_line -= view->offset;
9665 		else
9666 			s->first_displayed_line = 1;
9667 		s->selected_line += view->offset;
9668 		break;
9669 	}
9670 	case TOG_VIEW_LOG:
9671 		log_scroll_up(&view->state.log, view->offset);
9672 		view->state.log.selected += view->offset;
9673 		break;
9674 	case TOG_VIEW_REF:
9675 		ref_scroll_up(&view->state.ref, view->offset);
9676 		view->state.ref.selected += view->offset;
9677 		break;
9678 	case TOG_VIEW_TREE:
9679 		tree_scroll_up(&view->state.tree, view->offset);
9680 		view->state.tree.selected += view->offset;
9681 		break;
9682 	default:
9683 		break;
9684 	}
9685 
9686 	view->offset = 0;
9687 }
9688 
9689 /*
9690  * If the selected line is in the section of screen covered by the bottom split,
9691  * scroll down offset lines to move it into view and index its new position.
9692  */
9693 static const struct got_error *
9694 offset_selection_down(struct tog_view *view)
9695 {
9696 	const struct got_error	*err = NULL;
9697 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9698 	int			*selected = NULL;
9699 	int			 header, offset;
9700 
9701 	switch (view->type) {
9702 	case TOG_VIEW_BLAME: {
9703 		struct tog_blame_view_state *s = &view->state.blame;
9704 		header = 3;
9705 		scrolld = NULL;
9706 		if (s->selected_line > view->nlines - header) {
9707 			offset = abs(view->nlines - s->selected_line - header);
9708 			s->first_displayed_line += offset;
9709 			s->selected_line -= offset;
9710 			view->offset = offset;
9711 		}
9712 		break;
9713 	}
9714 	case TOG_VIEW_LOG: {
9715 		struct tog_log_view_state *s = &view->state.log;
9716 		scrolld = &log_scroll_down;
9717 		header = view_is_parent_view(view) ? 3 : 2;
9718 		selected = &s->selected;
9719 		break;
9720 	}
9721 	case TOG_VIEW_REF: {
9722 		struct tog_ref_view_state *s = &view->state.ref;
9723 		scrolld = &ref_scroll_down;
9724 		header = 3;
9725 		selected = &s->selected;
9726 		break;
9727 	}
9728 	case TOG_VIEW_TREE: {
9729 		struct tog_tree_view_state *s = &view->state.tree;
9730 		scrolld = &tree_scroll_down;
9731 		header = 5;
9732 		selected = &s->selected;
9733 		break;
9734 	}
9735 	default:
9736 		selected = NULL;
9737 		scrolld = NULL;
9738 		header = 0;
9739 		break;
9740 	}
9741 
9742 	if (selected && *selected > view->nlines - header) {
9743 		offset = abs(view->nlines - *selected - header);
9744 		view->offset = offset;
9745 		if (scrolld && offset) {
9746 			err = scrolld(view, offset);
9747 			*selected -= offset;
9748 		}
9749 	}
9750 
9751 	return err;
9752 }
9753 
9754 static void
9755 list_commands(FILE *fp)
9756 {
9757 	size_t i;
9758 
9759 	fprintf(fp, "commands:");
9760 	for (i = 0; i < nitems(tog_commands); i++) {
9761 		const struct tog_cmd *cmd = &tog_commands[i];
9762 		fprintf(fp, " %s", cmd->name);
9763 	}
9764 	fputc('\n', fp);
9765 }
9766 
9767 __dead static void
9768 usage(int hflag, int status)
9769 {
9770 	FILE *fp = (status == 0) ? stdout : stderr;
9771 
9772 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9773 	    getprogname());
9774 	if (hflag) {
9775 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9776 		list_commands(fp);
9777 	}
9778 	exit(status);
9779 }
9780 
9781 static char **
9782 make_argv(int argc, ...)
9783 {
9784 	va_list ap;
9785 	char **argv;
9786 	int i;
9787 
9788 	va_start(ap, argc);
9789 
9790 	argv = calloc(argc, sizeof(char *));
9791 	if (argv == NULL)
9792 		err(1, "calloc");
9793 	for (i = 0; i < argc; i++) {
9794 		argv[i] = strdup(va_arg(ap, char *));
9795 		if (argv[i] == NULL)
9796 			err(1, "strdup");
9797 	}
9798 
9799 	va_end(ap);
9800 	return argv;
9801 }
9802 
9803 /*
9804  * Try to convert 'tog path' into a 'tog log path' command.
9805  * The user could simply have mistyped the command rather than knowingly
9806  * provided a path. So check whether argv[0] can in fact be resolved
9807  * to a path in the HEAD commit and print a special error if not.
9808  * This hack is for mpi@ <3
9809  */
9810 static const struct got_error *
9811 tog_log_with_path(int argc, char *argv[])
9812 {
9813 	const struct got_error *error = NULL, *close_err;
9814 	const struct tog_cmd *cmd = NULL;
9815 	struct got_repository *repo = NULL;
9816 	struct got_worktree *worktree = NULL;
9817 	struct got_object_id *commit_id = NULL, *id = NULL;
9818 	struct got_commit_object *commit = NULL;
9819 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9820 	char *commit_id_str = NULL, **cmd_argv = NULL;
9821 	int *pack_fds = NULL;
9822 
9823 	cwd = getcwd(NULL, 0);
9824 	if (cwd == NULL)
9825 		return got_error_from_errno("getcwd");
9826 
9827 	error = got_repo_pack_fds_open(&pack_fds);
9828 	if (error != NULL)
9829 		goto done;
9830 
9831 	error = got_worktree_open(&worktree, cwd, NULL);
9832 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9833 		goto done;
9834 
9835 	if (worktree)
9836 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9837 	else
9838 		repo_path = strdup(cwd);
9839 	if (repo_path == NULL) {
9840 		error = got_error_from_errno("strdup");
9841 		goto done;
9842 	}
9843 
9844 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9845 	if (error != NULL)
9846 		goto done;
9847 
9848 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9849 	    repo, worktree);
9850 	if (error)
9851 		goto done;
9852 
9853 	error = tog_load_refs(repo, 0);
9854 	if (error)
9855 		goto done;
9856 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9857 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9858 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9859 	if (error)
9860 		goto done;
9861 
9862 	if (worktree) {
9863 		got_worktree_close(worktree);
9864 		worktree = NULL;
9865 	}
9866 
9867 	error = got_object_open_as_commit(&commit, repo, commit_id);
9868 	if (error)
9869 		goto done;
9870 
9871 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9872 	if (error) {
9873 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9874 			goto done;
9875 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9876 		    getprogname(), argv[0]);
9877 		usage(1, 1);
9878 		/* not reached */
9879 	}
9880 
9881 	error = got_object_id_str(&commit_id_str, commit_id);
9882 	if (error)
9883 		goto done;
9884 
9885 	cmd = &tog_commands[0]; /* log */
9886 	argc = 4;
9887 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9888 	error = cmd->cmd_main(argc, cmd_argv);
9889 done:
9890 	if (repo) {
9891 		close_err = got_repo_close(repo);
9892 		if (error == NULL)
9893 			error = close_err;
9894 	}
9895 	if (commit)
9896 		got_object_commit_close(commit);
9897 	if (worktree)
9898 		got_worktree_close(worktree);
9899 	if (pack_fds) {
9900 		const struct got_error *pack_err =
9901 		    got_repo_pack_fds_close(pack_fds);
9902 		if (error == NULL)
9903 			error = pack_err;
9904 	}
9905 	free(id);
9906 	free(commit_id_str);
9907 	free(commit_id);
9908 	free(cwd);
9909 	free(repo_path);
9910 	free(in_repo_path);
9911 	if (cmd_argv) {
9912 		int i;
9913 		for (i = 0; i < argc; i++)
9914 			free(cmd_argv[i]);
9915 		free(cmd_argv);
9916 	}
9917 	tog_free_refs();
9918 	return error;
9919 }
9920 
9921 int
9922 main(int argc, char *argv[])
9923 {
9924 	const struct got_error *io_err, *error = NULL;
9925 	const struct tog_cmd *cmd = NULL;
9926 	int ch, hflag = 0, Vflag = 0;
9927 	char **cmd_argv = NULL;
9928 	static const struct option longopts[] = {
9929 	    { "version", no_argument, NULL, 'V' },
9930 	    { NULL, 0, NULL, 0}
9931 	};
9932 	char *diff_algo_str = NULL;
9933 	const char *test_script_path;
9934 
9935 	setlocale(LC_CTYPE, "");
9936 
9937 	/*
9938 	 * Test mode init must happen before pledge() because "tty" will
9939 	 * not allow TTY-related ioctls to occur via regular files.
9940 	 */
9941 	test_script_path = getenv("TOG_TEST_SCRIPT");
9942 	if (test_script_path != NULL) {
9943 		error = init_mock_term(test_script_path);
9944 		if (error) {
9945 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9946 			return 1;
9947 		}
9948 	} else if (!isatty(STDIN_FILENO))
9949 		errx(1, "standard input is not a tty");
9950 
9951 #if !defined(PROFILE)
9952 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9953 	    NULL) == -1)
9954 		err(1, "pledge");
9955 #endif
9956 
9957 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9958 		switch (ch) {
9959 		case 'h':
9960 			hflag = 1;
9961 			break;
9962 		case 'V':
9963 			Vflag = 1;
9964 			break;
9965 		default:
9966 			usage(hflag, 1);
9967 			/* NOTREACHED */
9968 		}
9969 	}
9970 
9971 	argc -= optind;
9972 	argv += optind;
9973 	optind = 1;
9974 	optreset = 1;
9975 
9976 	if (Vflag) {
9977 		got_version_print_str();
9978 		return 0;
9979 	}
9980 
9981 	if (argc == 0) {
9982 		if (hflag)
9983 			usage(hflag, 0);
9984 		/* Build an argument vector which runs a default command. */
9985 		cmd = &tog_commands[0];
9986 		argc = 1;
9987 		cmd_argv = make_argv(argc, cmd->name);
9988 	} else {
9989 		size_t i;
9990 
9991 		/* Did the user specify a command? */
9992 		for (i = 0; i < nitems(tog_commands); i++) {
9993 			if (strncmp(tog_commands[i].name, argv[0],
9994 			    strlen(argv[0])) == 0) {
9995 				cmd = &tog_commands[i];
9996 				break;
9997 			}
9998 		}
9999 	}
10000 
10001 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
10002 	if (diff_algo_str) {
10003 		if (strcasecmp(diff_algo_str, "patience") == 0)
10004 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10005 		if (strcasecmp(diff_algo_str, "myers") == 0)
10006 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10007 	}
10008 
10009 	if (cmd == NULL) {
10010 		if (argc != 1)
10011 			usage(0, 1);
10012 		/* No command specified; try log with a path */
10013 		error = tog_log_with_path(argc, argv);
10014 	} else {
10015 		if (hflag)
10016 			cmd->cmd_usage();
10017 		else
10018 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10019 	}
10020 
10021 	if (using_mock_io) {
10022 		io_err = tog_io_close();
10023 		if (error == NULL)
10024 			error = io_err;
10025 	}
10026 	endwin();
10027 	if (cmd_argv) {
10028 		int i;
10029 		for (i = 0; i < argc; i++)
10030 			free(cmd_argv[i]);
10031 		free(cmd_argv);
10032 	}
10033 
10034 	if (error && error->code != GOT_ERR_CANCELLED &&
10035 	    error->code != GOT_ERR_EOF &&
10036 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10037 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10038 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10039 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10040 		return 1;
10041 	}
10042 	return 0;
10043 }