1 /*
2  * Copyright (c) 2018, 2019, 2020 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 #include <sys/stat.h>
19 #include <sys/ioctl.h>
20 
21 #include <ctype.h>
22 #include <errno.h>
23 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
24 #include <curses.h>
25 #include <panel.h>
26 #include <locale.h>
27 #include <sha1.h>
28 #include <sha2.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_version.h"
46 #include "got_error.h"
47 #include "got_object.h"
48 #include "got_reference.h"
49 #include "got_repository.h"
50 #include "got_diff.h"
51 #include "got_opentemp.h"
52 #include "got_utf8.h"
53 #include "got_cancel.h"
54 #include "got_commit_graph.h"
55 #include "got_blame.h"
56 #include "got_privsep.h"
57 #include "got_path.h"
58 #include "got_worktree.h"
59 #include "got_keyword.h"
60 
61 #ifndef MIN
62 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
63 #endif
64 
65 #ifndef MAX
66 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
67 #endif
68 
69 #define CTRL(x)		((x) & 0x1f)
70 
71 #ifndef nitems
72 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
73 #endif
74 
75 struct tog_cmd {
76 	const char *name;
77 	const struct got_error *(*cmd_main)(int, char *[]);
78 	void (*cmd_usage)(void);
79 };
80 
81 __dead static void	usage(int, int);
82 __dead static void	usage_log(void);
83 __dead static void	usage_diff(void);
84 __dead static void	usage_blame(void);
85 __dead static void	usage_tree(void);
86 __dead static void	usage_ref(void);
87 
88 static const struct got_error*	cmd_log(int, char *[]);
89 static const struct got_error*	cmd_diff(int, char *[]);
90 static const struct got_error*	cmd_blame(int, char *[]);
91 static const struct got_error*	cmd_tree(int, char *[]);
92 static const struct got_error*	cmd_ref(int, char *[]);
93 
94 static const struct tog_cmd tog_commands[] = {
95 	{ "log",	cmd_log,	usage_log },
96 	{ "diff",	cmd_diff,	usage_diff },
97 	{ "blame",	cmd_blame,	usage_blame },
98 	{ "tree",	cmd_tree,	usage_tree },
99 	{ "ref",	cmd_ref,	usage_ref },
100 };
101 
102 enum tog_view_type {
103 	TOG_VIEW_DIFF,
104 	TOG_VIEW_LOG,
105 	TOG_VIEW_BLAME,
106 	TOG_VIEW_TREE,
107 	TOG_VIEW_REF,
108 	TOG_VIEW_HELP
109 };
110 
111 /* Match _DIFF to _HELP with enum tog_view_type TOG_VIEW_* counterparts. */
112 enum tog_keymap_type {
113 	TOG_KEYMAP_KEYS = -2,
114 	TOG_KEYMAP_GLOBAL,
115 	TOG_KEYMAP_DIFF,
116 	TOG_KEYMAP_LOG,
117 	TOG_KEYMAP_BLAME,
118 	TOG_KEYMAP_TREE,
119 	TOG_KEYMAP_REF,
120 	TOG_KEYMAP_HELP
121 };
122 
123 enum tog_view_mode {
124 	TOG_VIEW_SPLIT_NONE,
125 	TOG_VIEW_SPLIT_VERT,
126 	TOG_VIEW_SPLIT_HRZN
127 };
128 
129 #define HSPLIT_SCALE	0.3f  /* default horizontal split scale */
130 
131 #define TOG_EOF_STRING	"(END)"
132 
133 struct commit_queue_entry {
134 	TAILQ_ENTRY(commit_queue_entry) entry;
135 	struct got_object_id *id;
136 	struct got_commit_object *commit;
137 	int idx;
138 };
139 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
140 struct commit_queue {
141 	int ncommits;
142 	struct commit_queue_head head;
143 };
144 
145 struct tog_color {
146 	STAILQ_ENTRY(tog_color) entry;
147 	regex_t regex;
148 	short colorpair;
149 };
150 STAILQ_HEAD(tog_colors, tog_color);
151 
152 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
153 static struct got_reflist_object_id_map *tog_refs_idmap;
154 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
155 
156 static const struct got_error *
157 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
158     struct got_reference* re2)
159 {
160 	const char *name1 = got_ref_get_name(re1);
161 	const char *name2 = got_ref_get_name(re2);
162 	int isbackup1, isbackup2;
163 
164 	/* Sort backup refs towards the bottom of the list. */
165 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
166 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
167 	if (!isbackup1 && isbackup2) {
168 		*cmp = -1;
169 		return NULL;
170 	} else if (isbackup1 && !isbackup2) {
171 		*cmp = 1;
172 		return NULL;
173 	}
174 
175 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
176 	return NULL;
177 }
178 
179 static const struct got_error *
180 tog_load_refs(struct got_repository *repo, int sort_by_date)
181 {
182 	const struct got_error *err;
183 
184 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
185 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
186 	    repo);
187 	if (err)
188 		return err;
189 
190 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
191 	    repo);
192 }
193 
194 static void
195 tog_free_refs(void)
196 {
197 	if (tog_refs_idmap) {
198 		got_reflist_object_id_map_free(tog_refs_idmap);
199 		tog_refs_idmap = NULL;
200 	}
201 	got_ref_list_free(&tog_refs);
202 }
203 
204 static const struct got_error *
205 add_color(struct tog_colors *colors, const char *pattern,
206     int idx, short color)
207 {
208 	const struct got_error *err = NULL;
209 	struct tog_color *tc;
210 	int regerr = 0;
211 
212 	if (idx < 1 || idx > COLOR_PAIRS - 1)
213 		return NULL;
214 
215 	init_pair(idx, color, -1);
216 
217 	tc = calloc(1, sizeof(*tc));
218 	if (tc == NULL)
219 		return got_error_from_errno("calloc");
220 	regerr = regcomp(&tc->regex, pattern,
221 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
222 	if (regerr) {
223 		static char regerr_msg[512];
224 		static char err_msg[512];
225 		regerror(regerr, &tc->regex, regerr_msg,
226 		    sizeof(regerr_msg));
227 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
228 		    regerr_msg);
229 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
230 		free(tc);
231 		return err;
232 	}
233 	tc->colorpair = idx;
234 	STAILQ_INSERT_HEAD(colors, tc, entry);
235 	return NULL;
236 }
237 
238 static void
239 free_colors(struct tog_colors *colors)
240 {
241 	struct tog_color *tc;
242 
243 	while (!STAILQ_EMPTY(colors)) {
244 		tc = STAILQ_FIRST(colors);
245 		STAILQ_REMOVE_HEAD(colors, entry);
246 		regfree(&tc->regex);
247 		free(tc);
248 	}
249 }
250 
251 static struct tog_color *
252 get_color(struct tog_colors *colors, int colorpair)
253 {
254 	struct tog_color *tc = NULL;
255 
256 	STAILQ_FOREACH(tc, colors, entry) {
257 		if (tc->colorpair == colorpair)
258 			return tc;
259 	}
260 
261 	return NULL;
262 }
263 
264 static int
265 default_color_value(const char *envvar)
266 {
267 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
272 		return COLOR_YELLOW;
273 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
276 		return COLOR_MAGENTA;
277 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
278 		return COLOR_MAGENTA;
279 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
280 		return COLOR_CYAN;
281 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
282 		return COLOR_GREEN;
283 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
284 		return COLOR_GREEN;
285 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
286 		return COLOR_CYAN;
287 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
288 		return COLOR_YELLOW;
289 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
290 		return COLOR_GREEN;
291 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
292 		return COLOR_MAGENTA;
293 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
294 		return COLOR_YELLOW;
295 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
296 		return COLOR_CYAN;
297 
298 	return -1;
299 }
300 
301 static int
302 get_color_value(const char *envvar)
303 {
304 	const char *val = getenv(envvar);
305 
306 	if (val == NULL)
307 		return default_color_value(envvar);
308 
309 	if (strcasecmp(val, "black") == 0)
310 		return COLOR_BLACK;
311 	if (strcasecmp(val, "red") == 0)
312 		return COLOR_RED;
313 	if (strcasecmp(val, "green") == 0)
314 		return COLOR_GREEN;
315 	if (strcasecmp(val, "yellow") == 0)
316 		return COLOR_YELLOW;
317 	if (strcasecmp(val, "blue") == 0)
318 		return COLOR_BLUE;
319 	if (strcasecmp(val, "magenta") == 0)
320 		return COLOR_MAGENTA;
321 	if (strcasecmp(val, "cyan") == 0)
322 		return COLOR_CYAN;
323 	if (strcasecmp(val, "white") == 0)
324 		return COLOR_WHITE;
325 	if (strcasecmp(val, "default") == 0)
326 		return -1;
327 
328 	return default_color_value(envvar);
329 }
330 
331 struct tog_diff_view_state {
332 	struct got_object_id *id1, *id2;
333 	const char *label1, *label2;
334 	FILE *f, *f1, *f2;
335 	int fd1, fd2;
336 	int lineno;
337 	int first_displayed_line;
338 	int last_displayed_line;
339 	int eof;
340 	int diff_context;
341 	int ignore_whitespace;
342 	int force_text_diff;
343 	struct got_repository *repo;
344 	struct got_diff_line *lines;
345 	size_t nlines;
346 	int matched_line;
347 	int selected_line;
348 
349 	/* passed from log or blame view; may be NULL */
350 	struct tog_view *parent_view;
351 };
352 
353 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
354 static volatile sig_atomic_t tog_thread_error;
355 
356 struct tog_log_thread_args {
357 	pthread_cond_t need_commits;
358 	pthread_cond_t commit_loaded;
359 	int commits_needed;
360 	int load_all;
361 	struct got_commit_graph *graph;
362 	struct commit_queue *real_commits;
363 	const char *in_repo_path;
364 	struct got_object_id *start_id;
365 	struct got_repository *repo;
366 	int *pack_fds;
367 	int log_complete;
368 	sig_atomic_t *quit;
369 	struct commit_queue_entry **first_displayed_entry;
370 	struct commit_queue_entry **selected_entry;
371 	int *searching;
372 	int *search_next_done;
373 	regex_t *regex;
374 	int *limiting;
375 	int limit_match;
376 	regex_t *limit_regex;
377 	struct commit_queue *limit_commits;
378 };
379 
380 struct tog_log_view_state {
381 	struct commit_queue *commits;
382 	struct commit_queue_entry *first_displayed_entry;
383 	struct commit_queue_entry *last_displayed_entry;
384 	struct commit_queue_entry *selected_entry;
385 	struct commit_queue real_commits;
386 	int selected;
387 	char *in_repo_path;
388 	char *head_ref_name;
389 	int log_branches;
390 	struct got_repository *repo;
391 	struct got_object_id *start_id;
392 	sig_atomic_t quit;
393 	pthread_t thread;
394 	struct tog_log_thread_args thread_args;
395 	struct commit_queue_entry *matched_entry;
396 	struct commit_queue_entry *search_entry;
397 	struct tog_colors colors;
398 	int use_committer;
399 	int limit_view;
400 	regex_t limit_regex;
401 	struct commit_queue limit_commits;
402 };
403 
404 #define TOG_COLOR_DIFF_MINUS		1
405 #define TOG_COLOR_DIFF_PLUS		2
406 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
407 #define TOG_COLOR_DIFF_META		4
408 #define TOG_COLOR_TREE_SUBMODULE	5
409 #define TOG_COLOR_TREE_SYMLINK		6
410 #define TOG_COLOR_TREE_DIRECTORY	7
411 #define TOG_COLOR_TREE_EXECUTABLE	8
412 #define TOG_COLOR_COMMIT		9
413 #define TOG_COLOR_AUTHOR		10
414 #define TOG_COLOR_DATE			11
415 #define TOG_COLOR_REFS_HEADS		12
416 #define TOG_COLOR_REFS_TAGS		13
417 #define TOG_COLOR_REFS_REMOTES		14
418 #define TOG_COLOR_REFS_BACKUP		15
419 
420 struct tog_blame_cb_args {
421 	struct tog_blame_line *lines; /* one per line */
422 	int nlines;
423 
424 	struct tog_view *view;
425 	struct got_object_id *commit_id;
426 	int *quit;
427 };
428 
429 struct tog_blame_thread_args {
430 	const char *path;
431 	struct got_repository *repo;
432 	struct tog_blame_cb_args *cb_args;
433 	int *complete;
434 	got_cancel_cb cancel_cb;
435 	void *cancel_arg;
436 	pthread_cond_t blame_complete;
437 };
438 
439 struct tog_blame {
440 	FILE *f;
441 	off_t filesize;
442 	struct tog_blame_line *lines;
443 	int nlines;
444 	off_t *line_offsets;
445 	pthread_t thread;
446 	struct tog_blame_thread_args thread_args;
447 	struct tog_blame_cb_args cb_args;
448 	const char *path;
449 	int *pack_fds;
450 };
451 
452 struct tog_blame_view_state {
453 	int first_displayed_line;
454 	int last_displayed_line;
455 	int selected_line;
456 	int last_diffed_line;
457 	int blame_complete;
458 	int eof;
459 	int done;
460 	struct got_object_id_queue blamed_commits;
461 	struct got_object_qid *blamed_commit;
462 	char *path;
463 	struct got_repository *repo;
464 	struct got_object_id *commit_id;
465 	struct got_object_id *id_to_log;
466 	struct tog_blame blame;
467 	int matched_line;
468 	struct tog_colors colors;
469 };
470 
471 struct tog_parent_tree {
472 	TAILQ_ENTRY(tog_parent_tree) entry;
473 	struct got_tree_object *tree;
474 	struct got_tree_entry *first_displayed_entry;
475 	struct got_tree_entry *selected_entry;
476 	int selected;
477 };
478 
479 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
480 
481 struct tog_tree_view_state {
482 	char *tree_label;
483 	struct got_object_id *commit_id;/* commit which this tree belongs to */
484 	struct got_tree_object *root;	/* the commit's root tree entry */
485 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
486 	struct got_tree_entry *first_displayed_entry;
487 	struct got_tree_entry *last_displayed_entry;
488 	struct got_tree_entry *selected_entry;
489 	int ndisplayed, selected, show_ids;
490 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
491 	char *head_ref_name;
492 	struct got_repository *repo;
493 	struct got_tree_entry *matched_entry;
494 	struct tog_colors colors;
495 };
496 
497 struct tog_reflist_entry {
498 	TAILQ_ENTRY(tog_reflist_entry) entry;
499 	struct got_reference *ref;
500 	int idx;
501 };
502 
503 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
504 
505 struct tog_ref_view_state {
506 	struct tog_reflist_head refs;
507 	struct tog_reflist_entry *first_displayed_entry;
508 	struct tog_reflist_entry *last_displayed_entry;
509 	struct tog_reflist_entry *selected_entry;
510 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
511 	struct got_repository *repo;
512 	struct tog_reflist_entry *matched_entry;
513 	struct tog_colors colors;
514 };
515 
516 struct tog_help_view_state {
517 	FILE			*f;
518 	off_t			*line_offsets;
519 	size_t			 nlines;
520 	int			 lineno;
521 	int			 first_displayed_line;
522 	int			 last_displayed_line;
523 	int			 eof;
524 	int			 matched_line;
525 	int			 selected_line;
526 	int			 all;
527 	enum tog_keymap_type	 type;
528 };
529 
530 #define GENERATE_HELP \
531 	KEYMAP_("Global", TOG_KEYMAP_GLOBAL), \
532 	KEY_("H F1", "Open view-specific help (double tap for all help)"), \
533 	KEY_("k C-p Up", "Move cursor or page up one line"), \
534 	KEY_("j C-n Down", "Move cursor or page down one line"), \
535 	KEY_("C-b b PgUp", "Scroll the view up one page"), \
536 	KEY_("C-f f PgDn Space", "Scroll the view down one page"), \
537 	KEY_("C-u u", "Scroll the view up one half page"), \
538 	KEY_("C-d d", "Scroll the view down one half page"), \
539 	KEY_("g", "Go to line N (default: first line)"), \
540 	KEY_("Home =", "Go to the first line"), \
541 	KEY_("G", "Go to line N (default: last line)"), \
542 	KEY_("End *", "Go to the last line"), \
543 	KEY_("l Right", "Scroll the view right"), \
544 	KEY_("h Left", "Scroll the view left"), \
545 	KEY_("$", "Scroll view to the rightmost position"), \
546 	KEY_("0", "Scroll view to the leftmost position"), \
547 	KEY_("-", "Decrease size of the focussed split"), \
548 	KEY_("+", "Increase size of the focussed split"), \
549 	KEY_("Tab", "Switch focus between views"), \
550 	KEY_("F", "Toggle fullscreen mode"), \
551 	KEY_("S", "Switch split-screen layout"), \
552 	KEY_("/", "Open prompt to enter search term"), \
553 	KEY_("n", "Find next line/token matching the current search term"), \
554 	KEY_("N", "Find previous line/token matching the current search term"),\
555 	KEY_("q", "Quit the focussed view; Quit help screen"), \
556 	KEY_("Q", "Quit tog"), \
557 	\
558 	KEYMAP_("Log view", TOG_KEYMAP_LOG), \
559 	KEY_("< ,", "Move cursor up one commit"), \
560 	KEY_("> .", "Move cursor down one commit"), \
561 	KEY_("Enter", "Open diff view of the selected commit"), \
562 	KEY_("B", "Reload the log view and toggle display of merged commits"), \
563 	KEY_("R", "Open ref view of all repository references"), \
564 	KEY_("T", "Display tree view of the repository from the selected" \
565 	    " commit"), \
566 	KEY_("@", "Toggle between displaying author and committer name"), \
567 	KEY_("&", "Open prompt to enter term to limit commits displayed"), \
568 	KEY_("C-g Backspace", "Cancel current search or log operation"), \
569 	KEY_("C-l", "Reload the log view with new commits in the repository"), \
570 	\
571 	KEYMAP_("Diff view", TOG_KEYMAP_DIFF), \
572 	KEY_("K < ,", "Display diff of next line in the file/log entry"), \
573 	KEY_("J > .", "Display diff of previous line in the file/log entry"), \
574 	KEY_("A", "Toggle between Myers and Patience diff algorithm"), \
575 	KEY_("a", "Toggle treatment of file as ASCII irrespective of binary" \
576 	    " data"), \
577 	KEY_("(", "Go to the previous file in the diff"), \
578 	KEY_(")", "Go to the next file in the diff"), \
579 	KEY_("{", "Go to the previous hunk in the diff"), \
580 	KEY_("}", "Go to the next hunk in the diff"), \
581 	KEY_("[", "Decrease the number of context lines"), \
582 	KEY_("]", "Increase the number of context lines"), \
583 	KEY_("w", "Toggle ignore whitespace-only changes in the diff"), \
584 	\
585 	KEYMAP_("Blame view", TOG_KEYMAP_BLAME), \
586 	KEY_("Enter", "Display diff view of the selected line's commit"), \
587 	KEY_("A", "Toggle diff algorithm between Myers and Patience"), \
588 	KEY_("L", "Open log view for the currently selected annotated line"), \
589 	KEY_("C", "Reload view with the previously blamed commit"), \
590 	KEY_("c", "Reload view with the version of the file found in the" \
591 	    " selected line's commit"), \
592 	KEY_("p", "Reload view with the version of the file found in the" \
593 	    " selected line's parent commit"), \
594 	\
595 	KEYMAP_("Tree view", TOG_KEYMAP_TREE), \
596 	KEY_("Enter", "Enter selected directory or open blame view of the" \
597 	    " selected file"), \
598 	KEY_("L", "Open log view for the selected entry"), \
599 	KEY_("R", "Open ref view of all repository references"), \
600 	KEY_("i", "Show object IDs for all tree entries"), \
601 	KEY_("Backspace", "Return to the parent directory"), \
602 	\
603 	KEYMAP_("Ref view", TOG_KEYMAP_REF), \
604 	KEY_("Enter", "Display log view of the selected reference"), \
605 	KEY_("T", "Display tree view of the selected reference"), \
606 	KEY_("i", "Toggle display of IDs for all non-symbolic references"), \
607 	KEY_("m", "Toggle display of last modified date for each reference"), \
608 	KEY_("o", "Toggle reference sort order (name -> timestamp)"), \
609 	KEY_("C-l", "Reload view with all repository references")
610 
611 struct tog_key_map {
612 	const char		*keys;
613 	const char		*info;
614 	enum tog_keymap_type	 type;
615 };
616 
617 /* curses io for tog regress */
618 struct tog_io {
619 	FILE	*cin;
620 	FILE	*cout;
621 	FILE	*f;
622 	FILE	*sdump;
623 	int	 wait_for_ui;
624 } tog_io;
625 static int using_mock_io;
626 
627 #define TOG_KEY_SCRDUMP	SHRT_MIN
628 
629 /*
630  * We implement two types of views: parent views and child views.
631  *
632  * The 'Tab' key switches focus between a parent view and its child view.
633  * Child views are shown side-by-side to their parent view, provided
634  * there is enough screen estate.
635  *
636  * When a new view is opened from within a parent view, this new view
637  * becomes a child view of the parent view, replacing any existing child.
638  *
639  * When a new view is opened from within a child view, this new view
640  * becomes a parent view which will obscure the views below until the
641  * user quits the new parent view by typing 'q'.
642  *
643  * This list of views contains parent views only.
644  * Child views are only pointed to by their parent view.
645  */
646 TAILQ_HEAD(tog_view_list_head, tog_view);
647 
648 struct tog_view {
649 	TAILQ_ENTRY(tog_view) entry;
650 	WINDOW *window;
651 	PANEL *panel;
652 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
653 	int resized_y, resized_x; /* begin_y/x based on user resizing */
654 	int maxx, x; /* max column and current start column */
655 	int lines, cols; /* copies of LINES and COLS */
656 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
657 	int gline, hiline; /* navigate to and highlight this nG line */
658 	int ch, count; /* current keymap and count prefix */
659 	int resized; /* set when in a resize event */
660 	int focussed; /* Only set on one parent or child view at a time. */
661 	int dying;
662 	struct tog_view *parent;
663 	struct tog_view *child;
664 
665 	/*
666 	 * This flag is initially set on parent views when a new child view
667 	 * is created. It gets toggled when the 'Tab' key switches focus
668 	 * between parent and child.
669 	 * The flag indicates whether focus should be passed on to our child
670 	 * view if this parent view gets picked for focus after another parent
671 	 * view was closed. This prevents child views from losing focus in such
672 	 * situations.
673 	 */
674 	int focus_child;
675 
676 	enum tog_view_mode mode;
677 	/* type-specific state */
678 	enum tog_view_type type;
679 	union {
680 		struct tog_diff_view_state diff;
681 		struct tog_log_view_state log;
682 		struct tog_blame_view_state blame;
683 		struct tog_tree_view_state tree;
684 		struct tog_ref_view_state ref;
685 		struct tog_help_view_state help;
686 	} state;
687 
688 	const struct got_error *(*show)(struct tog_view *);
689 	const struct got_error *(*input)(struct tog_view **,
690 	    struct tog_view *, int);
691 	const struct got_error *(*reset)(struct tog_view *);
692 	const struct got_error *(*resize)(struct tog_view *, int);
693 	const struct got_error *(*close)(struct tog_view *);
694 
695 	const struct got_error *(*search_start)(struct tog_view *);
696 	const struct got_error *(*search_next)(struct tog_view *);
697 	void (*search_setup)(struct tog_view *, FILE **, off_t **, size_t *,
698 	    int **, int **, int **, int **);
699 	int search_started;
700 	int searching;
701 #define TOG_SEARCH_FORWARD	1
702 #define TOG_SEARCH_BACKWARD	2
703 	int search_next_done;
704 #define TOG_SEARCH_HAVE_MORE	1
705 #define TOG_SEARCH_NO_MORE	2
706 #define TOG_SEARCH_HAVE_NONE	3
707 	regex_t regex;
708 	regmatch_t regmatch;
709 	const char *action;
710 };
711 
712 static const struct got_error *open_diff_view(struct tog_view *,
713     struct got_object_id *, struct got_object_id *,
714     const char *, const char *, int, int, int, struct tog_view *,
715     struct got_repository *);
716 static const struct got_error *show_diff_view(struct tog_view *);
717 static const struct got_error *input_diff_view(struct tog_view **,
718     struct tog_view *, int);
719 static const struct got_error *reset_diff_view(struct tog_view *);
720 static const struct got_error* close_diff_view(struct tog_view *);
721 static const struct got_error *search_start_diff_view(struct tog_view *);
722 static void search_setup_diff_view(struct tog_view *, FILE **, off_t **,
723     size_t *, int **, int **, int **, int **);
724 static const struct got_error *search_next_view_match(struct tog_view *);
725 
726 static const struct got_error *open_log_view(struct tog_view *,
727     struct got_object_id *, struct got_repository *,
728     const char *, const char *, int);
729 static const struct got_error * show_log_view(struct tog_view *);
730 static const struct got_error *input_log_view(struct tog_view **,
731     struct tog_view *, int);
732 static const struct got_error *resize_log_view(struct tog_view *, int);
733 static const struct got_error *close_log_view(struct tog_view *);
734 static const struct got_error *search_start_log_view(struct tog_view *);
735 static const struct got_error *search_next_log_view(struct tog_view *);
736 
737 static const struct got_error *open_blame_view(struct tog_view *, char *,
738     struct got_object_id *, struct got_repository *);
739 static const struct got_error *show_blame_view(struct tog_view *);
740 static const struct got_error *input_blame_view(struct tog_view **,
741     struct tog_view *, int);
742 static const struct got_error *reset_blame_view(struct tog_view *);
743 static const struct got_error *close_blame_view(struct tog_view *);
744 static const struct got_error *search_start_blame_view(struct tog_view *);
745 static void search_setup_blame_view(struct tog_view *, FILE **, off_t **,
746     size_t *, int **, int **, int **, int **);
747 
748 static const struct got_error *open_tree_view(struct tog_view *,
749     struct got_object_id *, const char *, struct got_repository *);
750 static const struct got_error *show_tree_view(struct tog_view *);
751 static const struct got_error *input_tree_view(struct tog_view **,
752     struct tog_view *, int);
753 static const struct got_error *close_tree_view(struct tog_view *);
754 static const struct got_error *search_start_tree_view(struct tog_view *);
755 static const struct got_error *search_next_tree_view(struct tog_view *);
756 
757 static const struct got_error *open_ref_view(struct tog_view *,
758     struct got_repository *);
759 static const struct got_error *show_ref_view(struct tog_view *);
760 static const struct got_error *input_ref_view(struct tog_view **,
761     struct tog_view *, int);
762 static const struct got_error *close_ref_view(struct tog_view *);
763 static const struct got_error *search_start_ref_view(struct tog_view *);
764 static const struct got_error *search_next_ref_view(struct tog_view *);
765 
766 static const struct got_error *open_help_view(struct tog_view *,
767     struct tog_view *);
768 static const struct got_error *show_help_view(struct tog_view *);
769 static const struct got_error *input_help_view(struct tog_view **,
770     struct tog_view *, int);
771 static const struct got_error *reset_help_view(struct tog_view *);
772 static const struct got_error* close_help_view(struct tog_view *);
773 static const struct got_error *search_start_help_view(struct tog_view *);
774 static void search_setup_help_view(struct tog_view *, FILE **, off_t **,
775     size_t *, int **, int **, int **, int **);
776 
777 static volatile sig_atomic_t tog_sigwinch_received;
778 static volatile sig_atomic_t tog_sigpipe_received;
779 static volatile sig_atomic_t tog_sigcont_received;
780 static volatile sig_atomic_t tog_sigint_received;
781 static volatile sig_atomic_t tog_sigterm_received;
782 
783 static void
784 tog_sigwinch(int signo)
785 {
786 	tog_sigwinch_received = 1;
787 }
788 
789 static void
790 tog_sigpipe(int signo)
791 {
792 	tog_sigpipe_received = 1;
793 }
794 
795 static void
796 tog_sigcont(int signo)
797 {
798 	tog_sigcont_received = 1;
799 }
800 
801 static void
802 tog_sigint(int signo)
803 {
804 	tog_sigint_received = 1;
805 }
806 
807 static void
808 tog_sigterm(int signo)
809 {
810 	tog_sigterm_received = 1;
811 }
812 
813 static int
814 tog_fatal_signal_received(void)
815 {
816 	return (tog_sigpipe_received ||
817 	    tog_sigint_received || tog_sigterm_received);
818 }
819 
820 static const struct got_error *
821 view_close(struct tog_view *view)
822 {
823 	const struct got_error *err = NULL, *child_err = NULL;
824 
825 	if (view->child) {
826 		child_err = view_close(view->child);
827 		view->child = NULL;
828 	}
829 	if (view->close)
830 		err = view->close(view);
831 	if (view->panel)
832 		del_panel(view->panel);
833 	if (view->window)
834 		delwin(view->window);
835 	free(view);
836 	return err ? err : child_err;
837 }
838 
839 static struct tog_view *
840 view_open(int nlines, int ncols, int begin_y, int begin_x,
841     enum tog_view_type type)
842 {
843 	struct tog_view *view = calloc(1, sizeof(*view));
844 
845 	if (view == NULL)
846 		return NULL;
847 
848 	view->type = type;
849 	view->lines = LINES;
850 	view->cols = COLS;
851 	view->nlines = nlines ? nlines : LINES - begin_y;
852 	view->ncols = ncols ? ncols : COLS - begin_x;
853 	view->begin_y = begin_y;
854 	view->begin_x = begin_x;
855 	view->window = newwin(nlines, ncols, begin_y, begin_x);
856 	if (view->window == NULL) {
857 		view_close(view);
858 		return NULL;
859 	}
860 	view->panel = new_panel(view->window);
861 	if (view->panel == NULL ||
862 	    set_panel_userptr(view->panel, view) != OK) {
863 		view_close(view);
864 		return NULL;
865 	}
866 
867 	keypad(view->window, TRUE);
868 	return view;
869 }
870 
871 static int
872 view_split_begin_x(int begin_x)
873 {
874 	if (begin_x > 0 || COLS < 120)
875 		return 0;
876 	return (COLS - MAX(COLS / 2, 80));
877 }
878 
879 /* XXX Stub till we decide what to do. */
880 static int
881 view_split_begin_y(int lines)
882 {
883 	return lines * HSPLIT_SCALE;
884 }
885 
886 static const struct got_error *view_resize(struct tog_view *);
887 
888 static const struct got_error *
889 view_splitscreen(struct tog_view *view)
890 {
891 	const struct got_error *err = NULL;
892 
893 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
894 		if (view->resized_y && view->resized_y < view->lines)
895 			view->begin_y = view->resized_y;
896 		else
897 			view->begin_y = view_split_begin_y(view->nlines);
898 		view->begin_x = 0;
899 	} else if (!view->resized) {
900 		if (view->resized_x && view->resized_x < view->cols - 1 &&
901 		    view->cols > 119)
902 			view->begin_x = view->resized_x;
903 		else
904 			view->begin_x = view_split_begin_x(0);
905 		view->begin_y = 0;
906 	}
907 	view->nlines = LINES - view->begin_y;
908 	view->ncols = COLS - view->begin_x;
909 	view->lines = LINES;
910 	view->cols = COLS;
911 	err = view_resize(view);
912 	if (err)
913 		return err;
914 
915 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
916 		view->parent->nlines = view->begin_y;
917 
918 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
919 		return got_error_from_errno("mvwin");
920 
921 	return NULL;
922 }
923 
924 static const struct got_error *
925 view_fullscreen(struct tog_view *view)
926 {
927 	const struct got_error *err = NULL;
928 
929 	view->begin_x = 0;
930 	view->begin_y = view->resized ? view->begin_y : 0;
931 	view->nlines = view->resized ? view->nlines : LINES;
932 	view->ncols = COLS;
933 	view->lines = LINES;
934 	view->cols = COLS;
935 	err = view_resize(view);
936 	if (err)
937 		return err;
938 
939 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
940 		return got_error_from_errno("mvwin");
941 
942 	return NULL;
943 }
944 
945 static int
946 view_is_parent_view(struct tog_view *view)
947 {
948 	return view->parent == NULL;
949 }
950 
951 static int
952 view_is_splitscreen(struct tog_view *view)
953 {
954 	return view->begin_x > 0 || view->begin_y > 0;
955 }
956 
957 static int
958 view_is_fullscreen(struct tog_view *view)
959 {
960 	return view->nlines == LINES && view->ncols == COLS;
961 }
962 
963 static int
964 view_is_hsplit_top(struct tog_view *view)
965 {
966 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
967 	    view_is_splitscreen(view->child);
968 }
969 
970 static void
971 view_border(struct tog_view *view)
972 {
973 	PANEL *panel;
974 	const struct tog_view *view_above;
975 
976 	if (view->parent)
977 		return view_border(view->parent);
978 
979 	panel = panel_above(view->panel);
980 	if (panel == NULL)
981 		return;
982 
983 	view_above = panel_userptr(panel);
984 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
985 		mvwhline(view->window, view_above->begin_y - 1,
986 		    view->begin_x, ACS_HLINE, view->ncols);
987 	else
988 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
989 		    ACS_VLINE, view->nlines);
990 }
991 
992 static const struct got_error *view_init_hsplit(struct tog_view *, int);
993 static const struct got_error *request_log_commits(struct tog_view *);
994 static const struct got_error *offset_selection_down(struct tog_view *);
995 static void offset_selection_up(struct tog_view *);
996 static void view_get_split(struct tog_view *, int *, int *);
997 
998 static const struct got_error *
999 view_resize(struct tog_view *view)
1000 {
1001 	const struct got_error	*err = NULL;
1002 	int			 dif, nlines, ncols;
1003 
1004 	dif = LINES - view->lines;  /* line difference */
1005 
1006 	if (view->lines > LINES)
1007 		nlines = view->nlines - (view->lines - LINES);
1008 	else
1009 		nlines = view->nlines + (LINES - view->lines);
1010 	if (view->cols > COLS)
1011 		ncols = view->ncols - (view->cols - COLS);
1012 	else
1013 		ncols = view->ncols + (COLS - view->cols);
1014 
1015 	if (view->child) {
1016 		int hs = view->child->begin_y;
1017 
1018 		if (!view_is_fullscreen(view))
1019 			view->child->begin_x = view_split_begin_x(view->begin_x);
1020 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
1021 		    view->child->begin_x == 0) {
1022 			ncols = COLS;
1023 
1024 			view_fullscreen(view->child);
1025 			if (view->child->focussed)
1026 				show_panel(view->child->panel);
1027 			else
1028 				show_panel(view->panel);
1029 		} else {
1030 			ncols = view->child->begin_x;
1031 
1032 			view_splitscreen(view->child);
1033 			show_panel(view->child->panel);
1034 		}
1035 		/*
1036 		 * XXX This is ugly and needs to be moved into the above
1037 		 * logic but "works" for now and my attempts at moving it
1038 		 * break either 'tab' or 'F' key maps in horizontal splits.
1039 		 */
1040 		if (hs) {
1041 			err = view_splitscreen(view->child);
1042 			if (err)
1043 				return err;
1044 			if (dif < 0) { /* top split decreased */
1045 				err = offset_selection_down(view);
1046 				if (err)
1047 					return err;
1048 			}
1049 			view_border(view);
1050 			update_panels();
1051 			doupdate();
1052 			show_panel(view->child->panel);
1053 			nlines = view->nlines;
1054 		}
1055 	} else if (view->parent == NULL)
1056 		ncols = COLS;
1057 
1058 	if (view->resize && dif > 0) {
1059 		err = view->resize(view, dif);
1060 		if (err)
1061 			return err;
1062 	}
1063 
1064 	if (wresize(view->window, nlines, ncols) == ERR)
1065 		return got_error_from_errno("wresize");
1066 	if (replace_panel(view->panel, view->window) == ERR)
1067 		return got_error_from_errno("replace_panel");
1068 	wclear(view->window);
1069 
1070 	view->nlines = nlines;
1071 	view->ncols = ncols;
1072 	view->lines = LINES;
1073 	view->cols = COLS;
1074 
1075 	return NULL;
1076 }
1077 
1078 static const struct got_error *
1079 resize_log_view(struct tog_view *view, int increase)
1080 {
1081 	struct tog_log_view_state	*s = &view->state.log;
1082 	const struct got_error		*err = NULL;
1083 	int				 n = 0;
1084 
1085 	if (s->selected_entry)
1086 		n = s->selected_entry->idx + view->lines - s->selected;
1087 
1088 	/*
1089 	 * Request commits to account for the increased
1090 	 * height so we have enough to populate the view.
1091 	 */
1092 	if (s->commits->ncommits < n) {
1093 		view->nscrolled = n - s->commits->ncommits + increase + 1;
1094 		err = request_log_commits(view);
1095 	}
1096 
1097 	return err;
1098 }
1099 
1100 static void
1101 view_adjust_offset(struct tog_view *view, int n)
1102 {
1103 	if (n == 0)
1104 		return;
1105 
1106 	if (view->parent && view->parent->offset) {
1107 		if (view->parent->offset + n >= 0)
1108 			view->parent->offset += n;
1109 		else
1110 			view->parent->offset = 0;
1111 	} else if (view->offset) {
1112 		if (view->offset - n >= 0)
1113 			view->offset -= n;
1114 		else
1115 			view->offset = 0;
1116 	}
1117 }
1118 
1119 static const struct got_error *
1120 view_resize_split(struct tog_view *view, int resize)
1121 {
1122 	const struct got_error	*err = NULL;
1123 	struct tog_view		*v = NULL;
1124 
1125 	if (view->parent)
1126 		v = view->parent;
1127 	else
1128 		v = view;
1129 
1130 	if (!v->child || !view_is_splitscreen(v->child))
1131 		return NULL;
1132 
1133 	v->resized = v->child->resized = resize;  /* lock for resize event */
1134 
1135 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
1136 		if (v->child->resized_y)
1137 			v->child->begin_y = v->child->resized_y;
1138 		if (view->parent)
1139 			v->child->begin_y -= resize;
1140 		else
1141 			v->child->begin_y += resize;
1142 		if (v->child->begin_y < 3) {
1143 			view->count = 0;
1144 			v->child->begin_y = 3;
1145 		} else if (v->child->begin_y > LINES - 1) {
1146 			view->count = 0;
1147 			v->child->begin_y = LINES - 1;
1148 		}
1149 		v->ncols = COLS;
1150 		v->child->ncols = COLS;
1151 		view_adjust_offset(view, resize);
1152 		err = view_init_hsplit(v, v->child->begin_y);
1153 		if (err)
1154 			return err;
1155 		v->child->resized_y = v->child->begin_y;
1156 	} else {
1157 		if (v->child->resized_x)
1158 			v->child->begin_x = v->child->resized_x;
1159 		if (view->parent)
1160 			v->child->begin_x -= resize;
1161 		else
1162 			v->child->begin_x += resize;
1163 		if (v->child->begin_x < 11) {
1164 			view->count = 0;
1165 			v->child->begin_x = 11;
1166 		} else if (v->child->begin_x > COLS - 1) {
1167 			view->count = 0;
1168 			v->child->begin_x = COLS - 1;
1169 		}
1170 		v->child->resized_x = v->child->begin_x;
1171 	}
1172 
1173 	v->child->mode = v->mode;
1174 	v->child->nlines = v->lines - v->child->begin_y;
1175 	v->child->ncols = v->cols - v->child->begin_x;
1176 	v->focus_child = 1;
1177 
1178 	err = view_fullscreen(v);
1179 	if (err)
1180 		return err;
1181 	err = view_splitscreen(v->child);
1182 	if (err)
1183 		return err;
1184 
1185 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1186 		err = offset_selection_down(v->child);
1187 		if (err)
1188 			return err;
1189 	}
1190 
1191 	if (v->resize)
1192 		err = v->resize(v, 0);
1193 	else if (v->child->resize)
1194 		err = v->child->resize(v->child, 0);
1195 
1196 	v->resized = v->child->resized = 0;
1197 
1198 	return err;
1199 }
1200 
1201 static void
1202 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1203 {
1204 	struct tog_view *v = src->child ? src->child : src;
1205 
1206 	dst->resized_x = v->resized_x;
1207 	dst->resized_y = v->resized_y;
1208 }
1209 
1210 static const struct got_error *
1211 view_close_child(struct tog_view *view)
1212 {
1213 	const struct got_error *err = NULL;
1214 
1215 	if (view->child == NULL)
1216 		return NULL;
1217 
1218 	err = view_close(view->child);
1219 	view->child = NULL;
1220 	return err;
1221 }
1222 
1223 static const struct got_error *
1224 view_set_child(struct tog_view *view, struct tog_view *child)
1225 {
1226 	const struct got_error *err = NULL;
1227 
1228 	view->child = child;
1229 	child->parent = view;
1230 
1231 	err = view_resize(view);
1232 	if (err)
1233 		return err;
1234 
1235 	if (view->child->resized_x || view->child->resized_y)
1236 		err = view_resize_split(view, 0);
1237 
1238 	return err;
1239 }
1240 
1241 static const struct got_error *view_dispatch_request(struct tog_view **,
1242     struct tog_view *, enum tog_view_type, int, int);
1243 
1244 static const struct got_error *
1245 view_request_new(struct tog_view **requested, struct tog_view *view,
1246     enum tog_view_type request)
1247 {
1248 	struct tog_view		*new_view = NULL;
1249 	const struct got_error	*err;
1250 	int			 y = 0, x = 0;
1251 
1252 	*requested = NULL;
1253 
1254 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP)
1255 		view_get_split(view, &y, &x);
1256 
1257 	err = view_dispatch_request(&new_view, view, request, y, x);
1258 	if (err)
1259 		return err;
1260 
1261 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN &&
1262 	    request != TOG_VIEW_HELP) {
1263 		err = view_init_hsplit(view, y);
1264 		if (err)
1265 			return err;
1266 	}
1267 
1268 	view->focussed = 0;
1269 	new_view->focussed = 1;
1270 	new_view->mode = view->mode;
1271 	new_view->nlines = request == TOG_VIEW_HELP ?
1272 	    view->lines : view->lines - y;
1273 
1274 	if (view_is_parent_view(view) && request != TOG_VIEW_HELP) {
1275 		view_transfer_size(new_view, view);
1276 		err = view_close_child(view);
1277 		if (err)
1278 			return err;
1279 		err = view_set_child(view, new_view);
1280 		if (err)
1281 			return err;
1282 		view->focus_child = 1;
1283 	} else
1284 		*requested = new_view;
1285 
1286 	return NULL;
1287 }
1288 
1289 static void
1290 tog_resizeterm(void)
1291 {
1292 	int cols, lines;
1293 	struct winsize size;
1294 
1295 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1296 		cols = 80;     /* Default */
1297 		lines = 24;
1298 	} else {
1299 		cols = size.ws_col;
1300 		lines = size.ws_row;
1301 	}
1302 	resize_term(lines, cols);
1303 }
1304 
1305 static const struct got_error *
1306 view_search_start(struct tog_view *view, int fast_refresh)
1307 {
1308 	const struct got_error *err = NULL;
1309 	struct tog_view *v = view;
1310 	char pattern[1024];
1311 	int ret;
1312 
1313 	if (view->search_started) {
1314 		regfree(&view->regex);
1315 		view->searching = 0;
1316 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1317 	}
1318 	view->search_started = 0;
1319 
1320 	if (view->nlines < 1)
1321 		return NULL;
1322 
1323 	if (view_is_hsplit_top(view))
1324 		v = view->child;
1325 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1326 		v = view->parent;
1327 
1328 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1329 	wclrtoeol(v->window);
1330 
1331 	nodelay(v->window, FALSE);  /* block for search term input */
1332 	nocbreak();
1333 	echo();
1334 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1335 	wrefresh(v->window);
1336 	cbreak();
1337 	noecho();
1338 	nodelay(v->window, TRUE);
1339 	if (!fast_refresh && !using_mock_io)
1340 		halfdelay(10);
1341 	if (ret == ERR)
1342 		return NULL;
1343 
1344 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1345 		err = view->search_start(view);
1346 		if (err) {
1347 			regfree(&view->regex);
1348 			return err;
1349 		}
1350 		view->search_started = 1;
1351 		view->searching = TOG_SEARCH_FORWARD;
1352 		view->search_next_done = 0;
1353 		view->search_next(view);
1354 	}
1355 
1356 	return NULL;
1357 }
1358 
1359 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1360 static const struct got_error *
1361 switch_split(struct tog_view *view)
1362 {
1363 	const struct got_error	*err = NULL;
1364 	struct tog_view		*v = NULL;
1365 
1366 	if (view->parent)
1367 		v = view->parent;
1368 	else
1369 		v = view;
1370 
1371 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1372 		v->mode = TOG_VIEW_SPLIT_VERT;
1373 	else
1374 		v->mode = TOG_VIEW_SPLIT_HRZN;
1375 
1376 	if (!v->child)
1377 		return NULL;
1378 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1379 		v->mode = TOG_VIEW_SPLIT_NONE;
1380 
1381 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1382 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1383 		v->child->begin_y = v->child->resized_y;
1384 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1385 		v->child->begin_x = v->child->resized_x;
1386 
1387 
1388 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1389 		v->ncols = COLS;
1390 		v->child->ncols = COLS;
1391 		v->child->nscrolled = LINES - v->child->nlines;
1392 
1393 		err = view_init_hsplit(v, v->child->begin_y);
1394 		if (err)
1395 			return err;
1396 	}
1397 	v->child->mode = v->mode;
1398 	v->child->nlines = v->lines - v->child->begin_y;
1399 	v->focus_child = 1;
1400 
1401 	err = view_fullscreen(v);
1402 	if (err)
1403 		return err;
1404 	err = view_splitscreen(v->child);
1405 	if (err)
1406 		return err;
1407 
1408 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1409 		v->mode = TOG_VIEW_SPLIT_VERT;
1410 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1411 		err = offset_selection_down(v);
1412 		if (err)
1413 			return err;
1414 		err = offset_selection_down(v->child);
1415 		if (err)
1416 			return err;
1417 	} else {
1418 		offset_selection_up(v);
1419 		offset_selection_up(v->child);
1420 	}
1421 	if (v->resize)
1422 		err = v->resize(v, 0);
1423 	else if (v->child->resize)
1424 		err = v->child->resize(v->child, 0);
1425 
1426 	return err;
1427 }
1428 
1429 /*
1430  * Strip trailing whitespace from str starting at byte *n;
1431  * if *n < 0, use strlen(str). Return new str length in *n.
1432  */
1433 static void
1434 strip_trailing_ws(char *str, int *n)
1435 {
1436 	size_t x = *n;
1437 
1438 	if (str == NULL || *str == '\0')
1439 		return;
1440 
1441 	if (x < 0)
1442 		x = strlen(str);
1443 
1444 	while (x-- > 0 && isspace((unsigned char)str[x]))
1445 		str[x] = '\0';
1446 
1447 	*n = x + 1;
1448 }
1449 
1450 /*
1451  * Extract visible substring of line y from the curses screen
1452  * and strip trailing whitespace. If vline is set, overwrite
1453  * line[vline] with '|' because the ACS_VLINE character is
1454  * written out as 'x'. Write the line to file f.
1455  */
1456 static const struct got_error *
1457 view_write_line(FILE *f, int y, int vline)
1458 {
1459 	char	line[COLS * MB_LEN_MAX];  /* allow for multibyte chars */
1460 	int	r, w;
1461 
1462 	r = mvwinnstr(curscr, y, 0, line, sizeof(line));
1463 	if (r == ERR)
1464 		return got_error_fmt(GOT_ERR_RANGE,
1465 		    "failed to extract line %d", y);
1466 
1467 	/*
1468 	 * In some views, lines are padded with blanks to COLS width.
1469 	 * Strip them so we can diff without the -b flag when testing.
1470 	 */
1471 	strip_trailing_ws(line, &r);
1472 
1473 	if (vline > 0)
1474 		line[vline] = '|';
1475 
1476 	w = fprintf(f, "%s\n", line);
1477 	if (w != r + 1)		/* \n */
1478 		return got_ferror(f, GOT_ERR_IO);
1479 
1480 	return NULL;
1481 }
1482 
1483 /*
1484  * Capture the visible curses screen by writing each line to the
1485  * file at the path set via the TOG_SCR_DUMP environment variable.
1486  */
1487 static const struct got_error *
1488 screendump(struct tog_view *view)
1489 {
1490 	const struct got_error	*err;
1491 	int			 i;
1492 
1493 	err = got_opentemp_truncate(tog_io.sdump);
1494 	if (err)
1495 		return err;
1496 
1497 	if ((view->child && view->child->begin_x) ||
1498 	    (view->parent && view->begin_x)) {
1499 		int ncols = view->child ? view->ncols : view->parent->ncols;
1500 
1501 		/* vertical splitscreen */
1502 		for (i = 0; i < view->nlines; ++i) {
1503 			err = view_write_line(tog_io.sdump, i, ncols - 1);
1504 			if (err)
1505 				goto done;
1506 		}
1507 	} else {
1508 		int hline = 0;
1509 
1510 		/* fullscreen or horizontal splitscreen */
1511 		if ((view->child && view->child->begin_y) ||
1512 		    (view->parent && view->begin_y))	/* hsplit */
1513 			hline = view->child ?
1514 			    view->child->begin_y : view->begin_y;
1515 
1516 		for (i = 0; i < view->lines; i++) {
1517 			if (hline && i == hline - 1) {
1518 				int c;
1519 
1520 				/* ACS_HLINE writes out as 'q', overwrite it */
1521 				for (c = 0; c < view->cols; ++c)
1522 					fputc('-', tog_io.sdump);
1523 				fputc('\n', tog_io.sdump);
1524 				continue;
1525 			}
1526 
1527 			err = view_write_line(tog_io.sdump, i, 0);
1528 			if (err)
1529 				goto done;
1530 		}
1531 	}
1532 
1533 done:
1534 	return err;
1535 }
1536 
1537 /*
1538  * Compute view->count from numeric input. Assign total to view->count and
1539  * return first non-numeric key entered.
1540  */
1541 static int
1542 get_compound_key(struct tog_view *view, int c)
1543 {
1544 	struct tog_view	*v = view;
1545 	int		 x, n = 0;
1546 
1547 	if (view_is_hsplit_top(view))
1548 		v = view->child;
1549 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1550 		v = view->parent;
1551 
1552 	view->count = 0;
1553 	cbreak();  /* block for input */
1554 	nodelay(view->window, FALSE);
1555 	wmove(v->window, v->nlines - 1, 0);
1556 	wclrtoeol(v->window);
1557 	waddch(v->window, ':');
1558 
1559 	do {
1560 		x = getcurx(v->window);
1561 		if (x != ERR && x < view->ncols) {
1562 			waddch(v->window, c);
1563 			wrefresh(v->window);
1564 		}
1565 
1566 		/*
1567 		 * Don't overflow. Max valid request should be the greatest
1568 		 * between the longest and total lines; cap at 10 million.
1569 		 */
1570 		if (n >= 9999999)
1571 			n = 9999999;
1572 		else
1573 			n = n * 10 + (c - '0');
1574 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1575 
1576 	if (c == 'G' || c == 'g') {	/* nG key map */
1577 		view->gline = view->hiline = n;
1578 		n = 0;
1579 		c = 0;
1580 	}
1581 
1582 	/* Massage excessive or inapplicable values at the input handler. */
1583 	view->count = n;
1584 
1585 	return c;
1586 }
1587 
1588 static void
1589 action_report(struct tog_view *view)
1590 {
1591 	struct tog_view *v = view;
1592 
1593 	if (view_is_hsplit_top(view))
1594 		v = view->child;
1595 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1596 		v = view->parent;
1597 
1598 	wmove(v->window, v->nlines - 1, 0);
1599 	wclrtoeol(v->window);
1600 	wprintw(v->window, ":%s", view->action);
1601 	wrefresh(v->window);
1602 
1603 	/*
1604 	 * Clear action status report. Only clear in blame view
1605 	 * once annotating is complete, otherwise it's too fast.
1606 	 */
1607 	if (view->type == TOG_VIEW_BLAME) {
1608 		if (view->state.blame.blame_complete)
1609 			view->action = NULL;
1610 	} else
1611 		view->action = NULL;
1612 }
1613 
1614 /*
1615  * Read the next line from the test script and assign
1616  * key instruction to *ch. If at EOF, set the *done flag.
1617  */
1618 static const struct got_error *
1619 tog_read_script_key(FILE *script, struct tog_view *view, int *ch, int *done)
1620 {
1621 	const struct got_error	*err = NULL;
1622 	char			*line = NULL;
1623 	size_t			 linesz = 0;
1624 
1625 	if (view->count && --view->count) {
1626 		*ch = view->ch;
1627 		return NULL;
1628 	} else
1629 		*ch = -1;
1630 
1631 	if (getline(&line, &linesz, script) == -1) {
1632 		if (feof(script)) {
1633 			*done = 1;
1634 			goto done;
1635 		} else {
1636 			err = got_ferror(script, GOT_ERR_IO);
1637 			goto done;
1638 		}
1639 	}
1640 
1641 	if (strncasecmp(line, "WAIT_FOR_UI", 11) == 0)
1642 		tog_io.wait_for_ui = 1;
1643 	else if (strncasecmp(line, "KEY_ENTER", 9) == 0)
1644 		*ch = KEY_ENTER;
1645 	else if (strncasecmp(line, "KEY_RIGHT", 9) == 0)
1646 		*ch = KEY_RIGHT;
1647 	else if (strncasecmp(line, "KEY_LEFT", 8) == 0)
1648 		*ch = KEY_LEFT;
1649 	else if (strncasecmp(line, "KEY_DOWN", 8) == 0)
1650 		*ch = KEY_DOWN;
1651 	else if (strncasecmp(line, "KEY_UP", 6) == 0)
1652 		*ch = KEY_UP;
1653 	else if (strncasecmp(line, "TAB", 3) == 0)
1654 		*ch = '\t';
1655 	else if (strncasecmp(line, "SCREENDUMP", 10) == 0)
1656 		*ch = TOG_KEY_SCRDUMP;
1657 	else if (isdigit((unsigned char)*line)) {
1658 		char *t = line;
1659 
1660 		while (isdigit((unsigned char)*t))
1661 			++t;
1662 		view->ch = *ch = *t;
1663 		*t = '\0';
1664 		/* ignore error, view->count is 0 if instruction is invalid */
1665 		view->count = strtonum(line, 0, INT_MAX, NULL);
1666 	} else
1667 		*ch = *line;
1668 
1669 done:
1670 	free(line);
1671 	return err;
1672 }
1673 
1674 static const struct got_error *
1675 view_input(struct tog_view **new, int *done, struct tog_view *view,
1676     struct tog_view_list_head *views, int fast_refresh)
1677 {
1678 	const struct got_error *err = NULL;
1679 	struct tog_view *v;
1680 	int ch, errcode;
1681 
1682 	*new = NULL;
1683 
1684 	if (view->action)
1685 		action_report(view);
1686 
1687 	/* Clear "no matches" indicator. */
1688 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1689 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1690 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1691 		view->count = 0;
1692 	}
1693 
1694 	if (view->searching && !view->search_next_done) {
1695 		errcode = pthread_mutex_unlock(&tog_mutex);
1696 		if (errcode)
1697 			return got_error_set_errno(errcode,
1698 			    "pthread_mutex_unlock");
1699 		sched_yield();
1700 		errcode = pthread_mutex_lock(&tog_mutex);
1701 		if (errcode)
1702 			return got_error_set_errno(errcode,
1703 			    "pthread_mutex_lock");
1704 		view->search_next(view);
1705 		return NULL;
1706 	}
1707 
1708 	/* Allow threads to make progress while we are waiting for input. */
1709 	errcode = pthread_mutex_unlock(&tog_mutex);
1710 	if (errcode)
1711 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1712 
1713 	if (using_mock_io) {
1714 		err = tog_read_script_key(tog_io.f, view, &ch, done);
1715 		if (err) {
1716 			errcode = pthread_mutex_lock(&tog_mutex);
1717 			return err;
1718 		}
1719 	} else if (view->count && --view->count) {
1720 		cbreak();
1721 		nodelay(view->window, TRUE);
1722 		ch = wgetch(view->window);
1723 		/* let C-g or backspace abort unfinished count */
1724 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1725 			view->count = 0;
1726 		else
1727 			ch = view->ch;
1728 	} else {
1729 		ch = wgetch(view->window);
1730 		if (ch >= '1' && ch  <= '9')
1731 			view->ch = ch = get_compound_key(view, ch);
1732 	}
1733 	if (view->hiline && ch != ERR && ch != 0)
1734 		view->hiline = 0;  /* key pressed, clear line highlight */
1735 	nodelay(view->window, TRUE);
1736 	errcode = pthread_mutex_lock(&tog_mutex);
1737 	if (errcode)
1738 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1739 
1740 	if (tog_sigwinch_received || tog_sigcont_received) {
1741 		tog_resizeterm();
1742 		tog_sigwinch_received = 0;
1743 		tog_sigcont_received = 0;
1744 		TAILQ_FOREACH(v, views, entry) {
1745 			err = view_resize(v);
1746 			if (err)
1747 				return err;
1748 			err = v->input(new, v, KEY_RESIZE);
1749 			if (err)
1750 				return err;
1751 			if (v->child) {
1752 				err = view_resize(v->child);
1753 				if (err)
1754 					return err;
1755 				err = v->child->input(new, v->child,
1756 				    KEY_RESIZE);
1757 				if (err)
1758 					return err;
1759 				if (v->child->resized_x || v->child->resized_y) {
1760 					err = view_resize_split(v, 0);
1761 					if (err)
1762 						return err;
1763 				}
1764 			}
1765 		}
1766 	}
1767 
1768 	switch (ch) {
1769 	case '?':
1770 	case 'H':
1771 	case KEY_F(1):
1772 		if (view->type == TOG_VIEW_HELP)
1773 			err = view->reset(view);
1774 		else
1775 			err = view_request_new(new, view, TOG_VIEW_HELP);
1776 		break;
1777 	case '\t':
1778 		view->count = 0;
1779 		if (view->child) {
1780 			view->focussed = 0;
1781 			view->child->focussed = 1;
1782 			view->focus_child = 1;
1783 		} else if (view->parent) {
1784 			view->focussed = 0;
1785 			view->parent->focussed = 1;
1786 			view->parent->focus_child = 0;
1787 			if (!view_is_splitscreen(view)) {
1788 				if (view->parent->resize) {
1789 					err = view->parent->resize(view->parent,
1790 					    0);
1791 					if (err)
1792 						return err;
1793 				}
1794 				offset_selection_up(view->parent);
1795 				err = view_fullscreen(view->parent);
1796 				if (err)
1797 					return err;
1798 			}
1799 		}
1800 		break;
1801 	case 'q':
1802 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1803 			if (view->parent->resize) {
1804 				/* might need more commits to fill fullscreen */
1805 				err = view->parent->resize(view->parent, 0);
1806 				if (err)
1807 					break;
1808 			}
1809 			offset_selection_up(view->parent);
1810 		}
1811 		err = view->input(new, view, ch);
1812 		view->dying = 1;
1813 		break;
1814 	case 'Q':
1815 		*done = 1;
1816 		break;
1817 	case 'F':
1818 		view->count = 0;
1819 		if (view_is_parent_view(view)) {
1820 			if (view->child == NULL)
1821 				break;
1822 			if (view_is_splitscreen(view->child)) {
1823 				view->focussed = 0;
1824 				view->child->focussed = 1;
1825 				err = view_fullscreen(view->child);
1826 			} else {
1827 				err = view_splitscreen(view->child);
1828 				if (!err)
1829 					err = view_resize_split(view, 0);
1830 			}
1831 			if (err)
1832 				break;
1833 			err = view->child->input(new, view->child,
1834 			    KEY_RESIZE);
1835 		} else {
1836 			if (view_is_splitscreen(view)) {
1837 				view->parent->focussed = 0;
1838 				view->focussed = 1;
1839 				err = view_fullscreen(view);
1840 			} else {
1841 				err = view_splitscreen(view);
1842 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1843 					err = view_resize(view->parent);
1844 				if (!err)
1845 					err = view_resize_split(view, 0);
1846 			}
1847 			if (err)
1848 				break;
1849 			err = view->input(new, view, KEY_RESIZE);
1850 		}
1851 		if (err)
1852 			break;
1853 		if (view->resize) {
1854 			err = view->resize(view, 0);
1855 			if (err)
1856 				break;
1857 		}
1858 		if (view->parent) {
1859 			if (view->parent->resize) {
1860 				err = view->parent->resize(view->parent, 0);
1861 				if (err != NULL)
1862 					break;
1863 			}
1864 			err = offset_selection_down(view->parent);
1865 			if (err != NULL)
1866 				break;
1867 		}
1868 		err = offset_selection_down(view);
1869 		break;
1870 	case 'S':
1871 		view->count = 0;
1872 		err = switch_split(view);
1873 		break;
1874 	case '-':
1875 		err = view_resize_split(view, -1);
1876 		break;
1877 	case '+':
1878 		err = view_resize_split(view, 1);
1879 		break;
1880 	case KEY_RESIZE:
1881 		break;
1882 	case '/':
1883 		view->count = 0;
1884 		if (view->search_start)
1885 			view_search_start(view, fast_refresh);
1886 		else
1887 			err = view->input(new, view, ch);
1888 		break;
1889 	case 'N':
1890 	case 'n':
1891 		if (view->search_started && view->search_next) {
1892 			view->searching = (ch == 'n' ?
1893 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1894 			view->search_next_done = 0;
1895 			view->search_next(view);
1896 		} else
1897 			err = view->input(new, view, ch);
1898 		break;
1899 	case 'A':
1900 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS) {
1901 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1902 			view->action = "Patience diff algorithm";
1903 		} else {
1904 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1905 			view->action = "Myers diff algorithm";
1906 		}
1907 		TAILQ_FOREACH(v, views, entry) {
1908 			if (v->reset) {
1909 				err = v->reset(v);
1910 				if (err)
1911 					return err;
1912 			}
1913 			if (v->child && v->child->reset) {
1914 				err = v->child->reset(v->child);
1915 				if (err)
1916 					return err;
1917 			}
1918 		}
1919 		break;
1920 	case TOG_KEY_SCRDUMP:
1921 		err = screendump(view);
1922 		break;
1923 	default:
1924 		err = view->input(new, view, ch);
1925 		break;
1926 	}
1927 
1928 	return err;
1929 }
1930 
1931 static int
1932 view_needs_focus_indication(struct tog_view *view)
1933 {
1934 	if (view_is_parent_view(view)) {
1935 		if (view->child == NULL || view->child->focussed)
1936 			return 0;
1937 		if (!view_is_splitscreen(view->child))
1938 			return 0;
1939 	} else if (!view_is_splitscreen(view))
1940 		return 0;
1941 
1942 	return view->focussed;
1943 }
1944 
1945 static const struct got_error *
1946 tog_io_close(void)
1947 {
1948 	const struct got_error *err = NULL;
1949 
1950 	if (tog_io.cin && fclose(tog_io.cin) == EOF)
1951 		err = got_ferror(tog_io.cin, GOT_ERR_IO);
1952 	if (tog_io.cout && fclose(tog_io.cout) == EOF && err == NULL)
1953 		err = got_ferror(tog_io.cout, GOT_ERR_IO);
1954 	if (tog_io.f && fclose(tog_io.f) == EOF && err == NULL)
1955 		err = got_ferror(tog_io.f, GOT_ERR_IO);
1956 	if (tog_io.sdump && fclose(tog_io.sdump) == EOF && err == NULL)
1957 		err = got_ferror(tog_io.sdump, GOT_ERR_IO);
1958 
1959 	return err;
1960 }
1961 
1962 static const struct got_error *
1963 view_loop(struct tog_view *view)
1964 {
1965 	const struct got_error *err = NULL;
1966 	struct tog_view_list_head views;
1967 	struct tog_view *new_view;
1968 	char *mode;
1969 	int fast_refresh = 10;
1970 	int done = 0, errcode;
1971 
1972 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1973 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1974 		view->mode = TOG_VIEW_SPLIT_VERT;
1975 	else
1976 		view->mode = TOG_VIEW_SPLIT_HRZN;
1977 
1978 	errcode = pthread_mutex_lock(&tog_mutex);
1979 	if (errcode)
1980 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1981 
1982 	TAILQ_INIT(&views);
1983 	TAILQ_INSERT_HEAD(&views, view, entry);
1984 
1985 	view->focussed = 1;
1986 	err = view->show(view);
1987 	if (err)
1988 		return err;
1989 	update_panels();
1990 	doupdate();
1991 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1992 	    !tog_fatal_signal_received()) {
1993 		/* Refresh fast during initialization, then become slower. */
1994 		if (fast_refresh && --fast_refresh == 0 && !using_mock_io)
1995 			halfdelay(10); /* switch to once per second */
1996 
1997 		err = view_input(&new_view, &done, view, &views, fast_refresh);
1998 		if (err)
1999 			break;
2000 
2001 		if (view->dying && view == TAILQ_FIRST(&views) &&
2002 		    TAILQ_NEXT(view, entry) == NULL)
2003 			done = 1;
2004 		if (done) {
2005 			struct tog_view *v;
2006 
2007 			/*
2008 			 * When we quit, scroll the screen up a single line
2009 			 * so we don't lose any information.
2010 			 */
2011 			TAILQ_FOREACH(v, &views, entry) {
2012 				wmove(v->window, 0, 0);
2013 				wdeleteln(v->window);
2014 				wnoutrefresh(v->window);
2015 				if (v->child && !view_is_fullscreen(v)) {
2016 					wmove(v->child->window, 0, 0);
2017 					wdeleteln(v->child->window);
2018 					wnoutrefresh(v->child->window);
2019 				}
2020 			}
2021 			doupdate();
2022 		}
2023 
2024 		if (view->dying) {
2025 			struct tog_view *v, *prev = NULL;
2026 
2027 			if (view_is_parent_view(view))
2028 				prev = TAILQ_PREV(view, tog_view_list_head,
2029 				    entry);
2030 			else if (view->parent)
2031 				prev = view->parent;
2032 
2033 			if (view->parent) {
2034 				view->parent->child = NULL;
2035 				view->parent->focus_child = 0;
2036 				/* Restore fullscreen line height. */
2037 				view->parent->nlines = view->parent->lines;
2038 				err = view_resize(view->parent);
2039 				if (err)
2040 					break;
2041 				/* Make resized splits persist. */
2042 				view_transfer_size(view->parent, view);
2043 			} else
2044 				TAILQ_REMOVE(&views, view, entry);
2045 
2046 			err = view_close(view);
2047 			if (err)
2048 				goto done;
2049 
2050 			view = NULL;
2051 			TAILQ_FOREACH(v, &views, entry) {
2052 				if (v->focussed)
2053 					break;
2054 			}
2055 			if (view == NULL && new_view == NULL) {
2056 				/* No view has focus. Try to pick one. */
2057 				if (prev)
2058 					view = prev;
2059 				else if (!TAILQ_EMPTY(&views)) {
2060 					view = TAILQ_LAST(&views,
2061 					    tog_view_list_head);
2062 				}
2063 				if (view) {
2064 					if (view->focus_child) {
2065 						view->child->focussed = 1;
2066 						view = view->child;
2067 					} else
2068 						view->focussed = 1;
2069 				}
2070 			}
2071 		}
2072 		if (new_view) {
2073 			struct tog_view *v, *t;
2074 			/* Only allow one parent view per type. */
2075 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
2076 				if (v->type != new_view->type)
2077 					continue;
2078 				TAILQ_REMOVE(&views, v, entry);
2079 				err = view_close(v);
2080 				if (err)
2081 					goto done;
2082 				break;
2083 			}
2084 			TAILQ_INSERT_TAIL(&views, new_view, entry);
2085 			view = new_view;
2086 		}
2087 		if (view && !done) {
2088 			if (view_is_parent_view(view)) {
2089 				if (view->child && view->child->focussed)
2090 					view = view->child;
2091 			} else {
2092 				if (view->parent && view->parent->focussed)
2093 					view = view->parent;
2094 			}
2095 			show_panel(view->panel);
2096 			if (view->child && view_is_splitscreen(view->child))
2097 				show_panel(view->child->panel);
2098 			if (view->parent && view_is_splitscreen(view)) {
2099 				err = view->parent->show(view->parent);
2100 				if (err)
2101 					goto done;
2102 			}
2103 			err = view->show(view);
2104 			if (err)
2105 				goto done;
2106 			if (view->child) {
2107 				err = view->child->show(view->child);
2108 				if (err)
2109 					goto done;
2110 			}
2111 			update_panels();
2112 			doupdate();
2113 		}
2114 	}
2115 done:
2116 	while (!TAILQ_EMPTY(&views)) {
2117 		const struct got_error *close_err;
2118 		view = TAILQ_FIRST(&views);
2119 		TAILQ_REMOVE(&views, view, entry);
2120 		close_err = view_close(view);
2121 		if (close_err && err == NULL)
2122 			err = close_err;
2123 	}
2124 
2125 	errcode = pthread_mutex_unlock(&tog_mutex);
2126 	if (errcode && err == NULL)
2127 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2128 
2129 	return err;
2130 }
2131 
2132 __dead static void
2133 usage_log(void)
2134 {
2135 	endwin();
2136 	fprintf(stderr,
2137 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
2138 	    getprogname());
2139 	exit(1);
2140 }
2141 
2142 /* Create newly allocated wide-character string equivalent to a byte string. */
2143 static const struct got_error *
2144 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
2145 {
2146 	char *vis = NULL;
2147 	const struct got_error *err = NULL;
2148 
2149 	*ws = NULL;
2150 	*wlen = mbstowcs(NULL, s, 0);
2151 	if (*wlen == (size_t)-1) {
2152 		int vislen;
2153 		if (errno != EILSEQ)
2154 			return got_error_from_errno("mbstowcs");
2155 
2156 		/* byte string invalid in current encoding; try to "fix" it */
2157 		err = got_mbsavis(&vis, &vislen, s);
2158 		if (err)
2159 			return err;
2160 		*wlen = mbstowcs(NULL, vis, 0);
2161 		if (*wlen == (size_t)-1) {
2162 			err = got_error_from_errno("mbstowcs"); /* give up */
2163 			goto done;
2164 		}
2165 	}
2166 
2167 	*ws = calloc(*wlen + 1, sizeof(**ws));
2168 	if (*ws == NULL) {
2169 		err = got_error_from_errno("calloc");
2170 		goto done;
2171 	}
2172 
2173 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
2174 		err = got_error_from_errno("mbstowcs");
2175 done:
2176 	free(vis);
2177 	if (err) {
2178 		free(*ws);
2179 		*ws = NULL;
2180 		*wlen = 0;
2181 	}
2182 	return err;
2183 }
2184 
2185 static const struct got_error *
2186 expand_tab(char **ptr, const char *src)
2187 {
2188 	char	*dst;
2189 	size_t	 len, n, idx = 0, sz = 0;
2190 
2191 	*ptr = NULL;
2192 	n = len = strlen(src);
2193 	dst = malloc(n + 1);
2194 	if (dst == NULL)
2195 		return got_error_from_errno("malloc");
2196 
2197 	while (idx < len && src[idx]) {
2198 		const char c = src[idx];
2199 
2200 		if (c == '\t') {
2201 			size_t nb = TABSIZE - sz % TABSIZE;
2202 			char *p;
2203 
2204 			p = realloc(dst, n + nb);
2205 			if (p == NULL) {
2206 				free(dst);
2207 				return got_error_from_errno("realloc");
2208 
2209 			}
2210 			dst = p;
2211 			n += nb;
2212 			memset(dst + sz, ' ', nb);
2213 			sz += nb;
2214 		} else
2215 			dst[sz++] = src[idx];
2216 		++idx;
2217 	}
2218 
2219 	dst[sz] = '\0';
2220 	*ptr = dst;
2221 	return NULL;
2222 }
2223 
2224 /*
2225  * Advance at most n columns from wline starting at offset off.
2226  * Return the index to the first character after the span operation.
2227  * Return the combined column width of all spanned wide characters in
2228  * *rcol.
2229  */
2230 static int
2231 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
2232 {
2233 	int width, i, cols = 0;
2234 
2235 	if (n == 0) {
2236 		*rcol = cols;
2237 		return off;
2238 	}
2239 
2240 	for (i = off; wline[i] != L'\0'; ++i) {
2241 		if (wline[i] == L'\t')
2242 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
2243 		else
2244 			width = wcwidth(wline[i]);
2245 
2246 		if (width == -1) {
2247 			width = 1;
2248 			wline[i] = L'.';
2249 		}
2250 
2251 		if (cols + width > n)
2252 			break;
2253 		cols += width;
2254 	}
2255 
2256 	*rcol = cols;
2257 	return i;
2258 }
2259 
2260 /*
2261  * Format a line for display, ensuring that it won't overflow a width limit.
2262  * With scrolling, the width returned refers to the scrolled version of the
2263  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
2264  */
2265 static const struct got_error *
2266 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
2267     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
2268 {
2269 	const struct got_error *err = NULL;
2270 	int cols;
2271 	wchar_t *wline = NULL;
2272 	char *exstr = NULL;
2273 	size_t wlen;
2274 	int i, scrollx;
2275 
2276 	*wlinep = NULL;
2277 	*widthp = 0;
2278 
2279 	if (expand) {
2280 		err = expand_tab(&exstr, line);
2281 		if (err)
2282 			return err;
2283 	}
2284 
2285 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
2286 	free(exstr);
2287 	if (err)
2288 		return err;
2289 
2290 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
2291 
2292 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
2293 		wline[wlen - 1] = L'\0';
2294 		wlen--;
2295 	}
2296 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
2297 		wline[wlen - 1] = L'\0';
2298 		wlen--;
2299 	}
2300 
2301 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
2302 	wline[i] = L'\0';
2303 
2304 	if (widthp)
2305 		*widthp = cols;
2306 	if (scrollxp)
2307 		*scrollxp = scrollx;
2308 	if (err)
2309 		free(wline);
2310 	else
2311 		*wlinep = wline;
2312 	return err;
2313 }
2314 
2315 static const struct got_error*
2316 build_refs_str(char **refs_str, struct got_reflist_head *refs,
2317     struct got_object_id *id, struct got_repository *repo)
2318 {
2319 	static const struct got_error *err = NULL;
2320 	struct got_reflist_entry *re;
2321 	char *s;
2322 	const char *name;
2323 
2324 	*refs_str = NULL;
2325 
2326 	if (refs == NULL)
2327 		return NULL;
2328 
2329 	TAILQ_FOREACH(re, refs, entry) {
2330 		struct got_tag_object *tag = NULL;
2331 		struct got_object_id *ref_id;
2332 		int cmp;
2333 
2334 		name = got_ref_get_name(re->ref);
2335 		if (strcmp(name, GOT_REF_HEAD) == 0)
2336 			continue;
2337 		if (strncmp(name, "refs/", 5) == 0)
2338 			name += 5;
2339 		if (strncmp(name, "got/", 4) == 0)
2340 			continue;
2341 		if (strncmp(name, "heads/", 6) == 0)
2342 			name += 6;
2343 		if (strncmp(name, "remotes/", 8) == 0) {
2344 			name += 8;
2345 			s = strstr(name, "/" GOT_REF_HEAD);
2346 			if (s != NULL && strcmp(s, "/" GOT_REF_HEAD) == 0)
2347 				continue;
2348 		}
2349 		err = got_ref_resolve(&ref_id, repo, re->ref);
2350 		if (err)
2351 			break;
2352 		if (strncmp(name, "tags/", 5) == 0) {
2353 			err = got_object_open_as_tag(&tag, repo, ref_id);
2354 			if (err) {
2355 				if (err->code != GOT_ERR_OBJ_TYPE) {
2356 					free(ref_id);
2357 					break;
2358 				}
2359 				/* Ref points at something other than a tag. */
2360 				err = NULL;
2361 				tag = NULL;
2362 			}
2363 		}
2364 		cmp = got_object_id_cmp(tag ?
2365 		    got_object_tag_get_object_id(tag) : ref_id, id);
2366 		free(ref_id);
2367 		if (tag)
2368 			got_object_tag_close(tag);
2369 		if (cmp != 0)
2370 			continue;
2371 		s = *refs_str;
2372 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
2373 		    s ? ", " : "", name) == -1) {
2374 			err = got_error_from_errno("asprintf");
2375 			free(s);
2376 			*refs_str = NULL;
2377 			break;
2378 		}
2379 		free(s);
2380 	}
2381 
2382 	return err;
2383 }
2384 
2385 static const struct got_error *
2386 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
2387     int col_tab_align)
2388 {
2389 	char *smallerthan;
2390 
2391 	smallerthan = strchr(author, '<');
2392 	if (smallerthan && smallerthan[1] != '\0')
2393 		author = smallerthan + 1;
2394 	author[strcspn(author, "@>")] = '\0';
2395 	return format_line(wauthor, author_width, NULL, author, 0, limit,
2396 	    col_tab_align, 0);
2397 }
2398 
2399 static const struct got_error *
2400 draw_commit(struct tog_view *view, struct got_commit_object *commit,
2401     struct got_object_id *id, const size_t date_display_cols,
2402     int author_display_cols)
2403 {
2404 	struct tog_log_view_state *s = &view->state.log;
2405 	const struct got_error *err = NULL;
2406 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
2407 	char *refs_str = NULL;
2408 	char *logmsg0 = NULL, *logmsg = NULL;
2409 	char *author = NULL;
2410 	wchar_t *wrefstr = NULL, *wlogmsg = NULL, *wauthor = NULL;
2411 	int author_width, refstr_width, logmsg_width;
2412 	char *newline, *line = NULL;
2413 	int col, limit, scrollx, logmsg_x;
2414 	const int avail = view->ncols;
2415 	struct tm tm;
2416 	time_t committer_time;
2417 	struct tog_color *tc;
2418 	struct got_reflist_head *refs;
2419 
2420 	committer_time = got_object_commit_get_committer_time(commit);
2421 	if (gmtime_r(&committer_time, &tm) == NULL)
2422 		return got_error_from_errno("gmtime_r");
2423 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2424 		return got_error(GOT_ERR_NO_SPACE);
2425 
2426 	if (avail <= date_display_cols)
2427 		limit = MIN(sizeof(datebuf) - 1, avail);
2428 	else
2429 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2430 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2431 	if (tc)
2432 		wattr_on(view->window,
2433 		    COLOR_PAIR(tc->colorpair), NULL);
2434 	waddnstr(view->window, datebuf, limit);
2435 	if (tc)
2436 		wattr_off(view->window,
2437 		    COLOR_PAIR(tc->colorpair), NULL);
2438 	col = limit;
2439 	if (col > avail)
2440 		goto done;
2441 
2442 	if (avail >= 120) {
2443 		char *id_str;
2444 		err = got_object_id_str(&id_str, id);
2445 		if (err)
2446 			goto done;
2447 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2448 		if (tc)
2449 			wattr_on(view->window,
2450 			    COLOR_PAIR(tc->colorpair), NULL);
2451 		wprintw(view->window, "%.8s ", id_str);
2452 		if (tc)
2453 			wattr_off(view->window,
2454 			    COLOR_PAIR(tc->colorpair), NULL);
2455 		free(id_str);
2456 		col += 9;
2457 		if (col > avail)
2458 			goto done;
2459 	}
2460 
2461 	if (s->use_committer)
2462 		author = strdup(got_object_commit_get_committer(commit));
2463 	else
2464 		author = strdup(got_object_commit_get_author(commit));
2465 	if (author == NULL) {
2466 		err = got_error_from_errno("strdup");
2467 		goto done;
2468 	}
2469 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2470 	if (err)
2471 		goto done;
2472 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2473 	if (tc)
2474 		wattr_on(view->window,
2475 		    COLOR_PAIR(tc->colorpair), NULL);
2476 	waddwstr(view->window, wauthor);
2477 	col += author_width;
2478 	while (col < avail && author_width < author_display_cols + 2) {
2479 		waddch(view->window, ' ');
2480 		col++;
2481 		author_width++;
2482 	}
2483 	if (tc)
2484 		wattr_off(view->window,
2485 		    COLOR_PAIR(tc->colorpair), NULL);
2486 	if (col > avail)
2487 		goto done;
2488 
2489 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2490 	if (err)
2491 		goto done;
2492 	logmsg = logmsg0;
2493 	while (*logmsg == '\n')
2494 		logmsg++;
2495 	newline = strchr(logmsg, '\n');
2496 	if (newline)
2497 		*newline = '\0';
2498 
2499 	limit = avail - col;
2500 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2501 		limit--;	/* for the border */
2502 
2503 	/* Prepend reference labels to log message if possible .*/
2504 	refs = got_reflist_object_id_map_lookup(tog_refs_idmap, id);
2505 	err = build_refs_str(&refs_str, refs, id, s->repo);
2506 	if (err)
2507 		goto done;
2508 	if (refs_str) {
2509 		char *rs;
2510 
2511 		if (asprintf(&rs, "[%s]", refs_str) == -1) {
2512 			err = got_error_from_errno("asprintf");
2513 			goto done;
2514 		}
2515 		err = format_line(&wrefstr, &refstr_width,
2516 		    &scrollx, rs, view->x, limit, col, 1);
2517 		free(rs);
2518 		if (err)
2519 			goto done;
2520 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2521 		if (tc)
2522 			wattr_on(view->window,
2523 			    COLOR_PAIR(tc->colorpair), NULL);
2524 		waddwstr(view->window, &wrefstr[scrollx]);
2525 		if (tc)
2526 			wattr_off(view->window,
2527 			    COLOR_PAIR(tc->colorpair), NULL);
2528 		col += MAX(refstr_width, 0);
2529 		if (col > avail)
2530 			goto done;
2531 
2532 		if (col < avail) {
2533 			waddch(view->window, ' ');
2534 			col++;
2535 		}
2536 
2537 		if (refstr_width > 0)
2538 			logmsg_x = 0;
2539 		else {
2540 			int unscrolled_refstr_width;
2541 			size_t len = wcslen(wrefstr);
2542 
2543 			/*
2544 			 * No need to check for -1 return value here since
2545 			 * unprintables have been replaced by span_wline().
2546 			 */
2547 			unscrolled_refstr_width = wcswidth(wrefstr, len);
2548 			unscrolled_refstr_width += 1; /* trailing space */
2549 			logmsg_x = view->x - unscrolled_refstr_width;
2550 		}
2551 
2552 		limit = avail - col;
2553 		if (view->child && !view_is_hsplit_top(view) && limit > 0)
2554 			limit--;	/* for the border */
2555 	} else
2556 		logmsg_x = view->x;
2557 
2558 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, logmsg_x,
2559 	    limit, col, 1);
2560 	if (err)
2561 		goto done;
2562 	waddwstr(view->window, &wlogmsg[scrollx]);
2563 	col += MAX(logmsg_width, 0);
2564 	while (col < avail) {
2565 		waddch(view->window, ' ');
2566 		col++;
2567 	}
2568 done:
2569 	free(logmsg0);
2570 	free(wlogmsg);
2571 	free(wrefstr);
2572 	free(refs_str);
2573 	free(author);
2574 	free(wauthor);
2575 	free(line);
2576 	return err;
2577 }
2578 
2579 static struct commit_queue_entry *
2580 alloc_commit_queue_entry(struct got_commit_object *commit,
2581     struct got_object_id *id)
2582 {
2583 	struct commit_queue_entry *entry;
2584 	struct got_object_id *dup;
2585 
2586 	entry = calloc(1, sizeof(*entry));
2587 	if (entry == NULL)
2588 		return NULL;
2589 
2590 	dup = got_object_id_dup(id);
2591 	if (dup == NULL) {
2592 		free(entry);
2593 		return NULL;
2594 	}
2595 
2596 	entry->id = dup;
2597 	entry->commit = commit;
2598 	return entry;
2599 }
2600 
2601 static void
2602 pop_commit(struct commit_queue *commits)
2603 {
2604 	struct commit_queue_entry *entry;
2605 
2606 	entry = TAILQ_FIRST(&commits->head);
2607 	TAILQ_REMOVE(&commits->head, entry, entry);
2608 	got_object_commit_close(entry->commit);
2609 	commits->ncommits--;
2610 	free(entry->id);
2611 	free(entry);
2612 }
2613 
2614 static void
2615 free_commits(struct commit_queue *commits)
2616 {
2617 	while (!TAILQ_EMPTY(&commits->head))
2618 		pop_commit(commits);
2619 }
2620 
2621 static const struct got_error *
2622 match_commit(int *have_match, struct got_object_id *id,
2623     struct got_commit_object *commit, regex_t *regex)
2624 {
2625 	const struct got_error *err = NULL;
2626 	regmatch_t regmatch;
2627 	char *id_str = NULL, *logmsg = NULL;
2628 
2629 	*have_match = 0;
2630 
2631 	err = got_object_id_str(&id_str, id);
2632 	if (err)
2633 		return err;
2634 
2635 	err = got_object_commit_get_logmsg(&logmsg, commit);
2636 	if (err)
2637 		goto done;
2638 
2639 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2640 	    &regmatch, 0) == 0 ||
2641 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2642 	    &regmatch, 0) == 0 ||
2643 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2644 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2645 		*have_match = 1;
2646 done:
2647 	free(id_str);
2648 	free(logmsg);
2649 	return err;
2650 }
2651 
2652 static const struct got_error *
2653 queue_commits(struct tog_log_thread_args *a)
2654 {
2655 	const struct got_error *err = NULL;
2656 
2657 	/*
2658 	 * We keep all commits open throughout the lifetime of the log
2659 	 * view in order to avoid having to re-fetch commits from disk
2660 	 * while updating the display.
2661 	 */
2662 	do {
2663 		struct got_object_id id;
2664 		struct got_commit_object *commit;
2665 		struct commit_queue_entry *entry;
2666 		int limit_match = 0;
2667 		int errcode;
2668 
2669 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2670 		    NULL, NULL);
2671 		if (err)
2672 			break;
2673 
2674 		err = got_object_open_as_commit(&commit, a->repo, &id);
2675 		if (err)
2676 			break;
2677 		entry = alloc_commit_queue_entry(commit, &id);
2678 		if (entry == NULL) {
2679 			err = got_error_from_errno("alloc_commit_queue_entry");
2680 			break;
2681 		}
2682 
2683 		errcode = pthread_mutex_lock(&tog_mutex);
2684 		if (errcode) {
2685 			err = got_error_set_errno(errcode,
2686 			    "pthread_mutex_lock");
2687 			break;
2688 		}
2689 
2690 		entry->idx = a->real_commits->ncommits;
2691 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2692 		a->real_commits->ncommits++;
2693 
2694 		if (*a->limiting) {
2695 			err = match_commit(&limit_match, &id, commit,
2696 			    a->limit_regex);
2697 			if (err)
2698 				break;
2699 
2700 			if (limit_match) {
2701 				struct commit_queue_entry *matched;
2702 
2703 				matched = alloc_commit_queue_entry(
2704 				    entry->commit, entry->id);
2705 				if (matched == NULL) {
2706 					err = got_error_from_errno(
2707 					    "alloc_commit_queue_entry");
2708 					break;
2709 				}
2710 				matched->commit = entry->commit;
2711 				got_object_commit_retain(entry->commit);
2712 
2713 				matched->idx = a->limit_commits->ncommits;
2714 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2715 				    matched, entry);
2716 				a->limit_commits->ncommits++;
2717 			}
2718 
2719 			/*
2720 			 * This is how we signal log_thread() that we
2721 			 * have found a match, and that it should be
2722 			 * counted as a new entry for the view.
2723 			 */
2724 			a->limit_match = limit_match;
2725 		}
2726 
2727 		if (*a->searching == TOG_SEARCH_FORWARD &&
2728 		    !*a->search_next_done) {
2729 			int have_match;
2730 			err = match_commit(&have_match, &id, commit, a->regex);
2731 			if (err)
2732 				break;
2733 
2734 			if (*a->limiting) {
2735 				if (limit_match && have_match)
2736 					*a->search_next_done =
2737 					    TOG_SEARCH_HAVE_MORE;
2738 			} else if (have_match)
2739 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2740 		}
2741 
2742 		errcode = pthread_mutex_unlock(&tog_mutex);
2743 		if (errcode && err == NULL)
2744 			err = got_error_set_errno(errcode,
2745 			    "pthread_mutex_unlock");
2746 		if (err)
2747 			break;
2748 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2749 
2750 	return err;
2751 }
2752 
2753 static void
2754 select_commit(struct tog_log_view_state *s)
2755 {
2756 	struct commit_queue_entry *entry;
2757 	int ncommits = 0;
2758 
2759 	entry = s->first_displayed_entry;
2760 	while (entry) {
2761 		if (ncommits == s->selected) {
2762 			s->selected_entry = entry;
2763 			break;
2764 		}
2765 		entry = TAILQ_NEXT(entry, entry);
2766 		ncommits++;
2767 	}
2768 }
2769 
2770 static const struct got_error *
2771 draw_commits(struct tog_view *view)
2772 {
2773 	const struct got_error *err = NULL;
2774 	struct tog_log_view_state *s = &view->state.log;
2775 	struct commit_queue_entry *entry = s->selected_entry;
2776 	int limit = view->nlines;
2777 	int width;
2778 	int ncommits, author_cols = 4, refstr_cols;
2779 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2780 	char *refs_str = NULL;
2781 	wchar_t *wline;
2782 	struct tog_color *tc;
2783 	static const size_t date_display_cols = 12;
2784 	struct got_reflist_head *refs;
2785 
2786 	if (view_is_hsplit_top(view))
2787 		--limit;  /* account for border */
2788 
2789 	if (s->selected_entry &&
2790 	    !(view->searching && view->search_next_done == 0)) {
2791 		err = got_object_id_str(&id_str, s->selected_entry->id);
2792 		if (err)
2793 			return err;
2794 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2795 		    s->selected_entry->id);
2796 		err = build_refs_str(&refs_str, refs, s->selected_entry->id,
2797 		    s->repo);
2798 		if (err)
2799 			goto done;
2800 	}
2801 
2802 	if (s->thread_args.commits_needed == 0 && !using_mock_io)
2803 		halfdelay(10); /* disable fast refresh */
2804 
2805 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2806 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2807 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2808 		    (view->searching && !view->search_next_done) ?
2809 		    "searching..." : "loading...") == -1) {
2810 			err = got_error_from_errno("asprintf");
2811 			goto done;
2812 		}
2813 	} else {
2814 		const char *search_str = NULL;
2815 		const char *limit_str = NULL;
2816 
2817 		if (view->searching) {
2818 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2819 				search_str = "no more matches";
2820 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2821 				search_str = "no matches found";
2822 			else if (!view->search_next_done)
2823 				search_str = "searching...";
2824 		}
2825 
2826 		if (s->limit_view && s->commits->ncommits == 0)
2827 			limit_str = "no matches found";
2828 
2829 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2830 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2831 		    search_str ? search_str : (refs_str ? refs_str : ""),
2832 		    limit_str ? limit_str : "") == -1) {
2833 			err = got_error_from_errno("asprintf");
2834 			goto done;
2835 		}
2836 	}
2837 
2838 	free(refs_str);
2839 	refs_str = NULL;
2840 
2841 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2842 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2843 		    "........................................",
2844 		    s->in_repo_path, ncommits_str) == -1) {
2845 			err = got_error_from_errno("asprintf");
2846 			header = NULL;
2847 			goto done;
2848 		}
2849 	} else if (asprintf(&header, "commit %s%s",
2850 	    id_str ? id_str : "........................................",
2851 	    ncommits_str) == -1) {
2852 		err = got_error_from_errno("asprintf");
2853 		header = NULL;
2854 		goto done;
2855 	}
2856 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2857 	if (err)
2858 		goto done;
2859 
2860 	werase(view->window);
2861 
2862 	if (view_needs_focus_indication(view))
2863 		wstandout(view->window);
2864 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2865 	if (tc)
2866 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2867 	waddwstr(view->window, wline);
2868 	while (width < view->ncols) {
2869 		waddch(view->window, ' ');
2870 		width++;
2871 	}
2872 	if (tc)
2873 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2874 	if (view_needs_focus_indication(view))
2875 		wstandend(view->window);
2876 	free(wline);
2877 	if (limit <= 1)
2878 		goto done;
2879 
2880 	/* Grow author column size if necessary, and set view->maxx. */
2881 	entry = s->first_displayed_entry;
2882 	ncommits = 0;
2883 	view->maxx = 0;
2884 	while (entry) {
2885 		struct got_commit_object *c = entry->commit;
2886 		char *author, *eol, *msg, *msg0;
2887 		wchar_t *wauthor, *wmsg;
2888 		int width;
2889 		if (ncommits >= limit - 1)
2890 			break;
2891 		if (s->use_committer)
2892 			author = strdup(got_object_commit_get_committer(c));
2893 		else
2894 			author = strdup(got_object_commit_get_author(c));
2895 		if (author == NULL) {
2896 			err = got_error_from_errno("strdup");
2897 			goto done;
2898 		}
2899 		err = format_author(&wauthor, &width, author, COLS,
2900 		    date_display_cols);
2901 		if (author_cols < width)
2902 			author_cols = width;
2903 		free(wauthor);
2904 		free(author);
2905 		if (err)
2906 			goto done;
2907 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2908 		    entry->id);
2909 		err = build_refs_str(&refs_str, refs, entry->id, s->repo);
2910 		if (err)
2911 			goto done;
2912 		if (refs_str) {
2913 			wchar_t *ws;
2914 			err = format_line(&ws, &width, NULL, refs_str,
2915 			    0, INT_MAX, date_display_cols + author_cols, 0);
2916 			free(ws);
2917 			free(refs_str);
2918 			refs_str = NULL;
2919 			if (err)
2920 				goto done;
2921 			refstr_cols = width + 3; /* account for [ ] + space */
2922 		} else
2923 			refstr_cols = 0;
2924 		err = got_object_commit_get_logmsg(&msg0, c);
2925 		if (err)
2926 			goto done;
2927 		msg = msg0;
2928 		while (*msg == '\n')
2929 			++msg;
2930 		if ((eol = strchr(msg, '\n')))
2931 			*eol = '\0';
2932 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2933 		    date_display_cols + author_cols + refstr_cols, 0);
2934 		if (err)
2935 			goto done;
2936 		view->maxx = MAX(view->maxx, width + refstr_cols);
2937 		free(msg0);
2938 		free(wmsg);
2939 		ncommits++;
2940 		entry = TAILQ_NEXT(entry, entry);
2941 	}
2942 
2943 	entry = s->first_displayed_entry;
2944 	s->last_displayed_entry = s->first_displayed_entry;
2945 	ncommits = 0;
2946 	while (entry) {
2947 		if (ncommits >= limit - 1)
2948 			break;
2949 		if (ncommits == s->selected)
2950 			wstandout(view->window);
2951 		err = draw_commit(view, entry->commit, entry->id,
2952 		    date_display_cols, author_cols);
2953 		if (ncommits == s->selected)
2954 			wstandend(view->window);
2955 		if (err)
2956 			goto done;
2957 		ncommits++;
2958 		s->last_displayed_entry = entry;
2959 		entry = TAILQ_NEXT(entry, entry);
2960 	}
2961 
2962 	view_border(view);
2963 done:
2964 	free(id_str);
2965 	free(refs_str);
2966 	free(ncommits_str);
2967 	free(header);
2968 	return err;
2969 }
2970 
2971 static void
2972 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2973 {
2974 	struct commit_queue_entry *entry;
2975 	int nscrolled = 0;
2976 
2977 	entry = TAILQ_FIRST(&s->commits->head);
2978 	if (s->first_displayed_entry == entry)
2979 		return;
2980 
2981 	entry = s->first_displayed_entry;
2982 	while (entry && nscrolled < maxscroll) {
2983 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2984 		if (entry) {
2985 			s->first_displayed_entry = entry;
2986 			nscrolled++;
2987 		}
2988 	}
2989 }
2990 
2991 static const struct got_error *
2992 trigger_log_thread(struct tog_view *view, int wait)
2993 {
2994 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2995 	int errcode;
2996 
2997 	if (!using_mock_io)
2998 		halfdelay(1); /* fast refresh while loading commits */
2999 
3000 	while (!ta->log_complete && !tog_thread_error &&
3001 	    (ta->commits_needed > 0 || ta->load_all)) {
3002 		/* Wake the log thread. */
3003 		errcode = pthread_cond_signal(&ta->need_commits);
3004 		if (errcode)
3005 			return got_error_set_errno(errcode,
3006 			    "pthread_cond_signal");
3007 
3008 		/*
3009 		 * The mutex will be released while the view loop waits
3010 		 * in wgetch(), at which time the log thread will run.
3011 		 */
3012 		if (!wait)
3013 			break;
3014 
3015 		/* Display progress update in log view. */
3016 		show_log_view(view);
3017 		update_panels();
3018 		doupdate();
3019 
3020 		/* Wait right here while next commit is being loaded. */
3021 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
3022 		if (errcode)
3023 			return got_error_set_errno(errcode,
3024 			    "pthread_cond_wait");
3025 
3026 		/* Display progress update in log view. */
3027 		show_log_view(view);
3028 		update_panels();
3029 		doupdate();
3030 	}
3031 
3032 	return NULL;
3033 }
3034 
3035 static const struct got_error *
3036 request_log_commits(struct tog_view *view)
3037 {
3038 	struct tog_log_view_state	*state = &view->state.log;
3039 	const struct got_error		*err = NULL;
3040 
3041 	if (state->thread_args.log_complete)
3042 		return NULL;
3043 
3044 	state->thread_args.commits_needed += view->nscrolled;
3045 	err = trigger_log_thread(view, 1);
3046 	view->nscrolled = 0;
3047 
3048 	return err;
3049 }
3050 
3051 static const struct got_error *
3052 log_scroll_down(struct tog_view *view, int maxscroll)
3053 {
3054 	struct tog_log_view_state *s = &view->state.log;
3055 	const struct got_error *err = NULL;
3056 	struct commit_queue_entry *pentry;
3057 	int nscrolled = 0, ncommits_needed;
3058 
3059 	if (s->last_displayed_entry == NULL)
3060 		return NULL;
3061 
3062 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
3063 	if (s->commits->ncommits < ncommits_needed &&
3064 	    !s->thread_args.log_complete) {
3065 		/*
3066 		 * Ask the log thread for required amount of commits.
3067 		 */
3068 		s->thread_args.commits_needed +=
3069 		    ncommits_needed - s->commits->ncommits;
3070 		err = trigger_log_thread(view, 1);
3071 		if (err)
3072 			return err;
3073 	}
3074 
3075 	do {
3076 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
3077 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
3078 			break;
3079 
3080 		s->last_displayed_entry = pentry ?
3081 		    pentry : s->last_displayed_entry;
3082 
3083 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
3084 		if (pentry == NULL)
3085 			break;
3086 		s->first_displayed_entry = pentry;
3087 	} while (++nscrolled < maxscroll);
3088 
3089 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
3090 		view->nscrolled += nscrolled;
3091 	else
3092 		view->nscrolled = 0;
3093 
3094 	return err;
3095 }
3096 
3097 static const struct got_error *
3098 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
3099     struct got_commit_object *commit, struct got_object_id *commit_id,
3100     struct tog_view *log_view, struct got_repository *repo)
3101 {
3102 	const struct got_error *err;
3103 	struct got_object_qid *parent_id;
3104 	struct tog_view *diff_view;
3105 
3106 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
3107 	if (diff_view == NULL)
3108 		return got_error_from_errno("view_open");
3109 
3110 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
3111 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
3112 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
3113 	if (err == NULL)
3114 		*new_view = diff_view;
3115 	return err;
3116 }
3117 
3118 static const struct got_error *
3119 tree_view_visit_subtree(struct tog_tree_view_state *s,
3120     struct got_tree_object *subtree)
3121 {
3122 	struct tog_parent_tree *parent;
3123 
3124 	parent = calloc(1, sizeof(*parent));
3125 	if (parent == NULL)
3126 		return got_error_from_errno("calloc");
3127 
3128 	parent->tree = s->tree;
3129 	parent->first_displayed_entry = s->first_displayed_entry;
3130 	parent->selected_entry = s->selected_entry;
3131 	parent->selected = s->selected;
3132 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3133 	s->tree = subtree;
3134 	s->selected = 0;
3135 	s->first_displayed_entry = NULL;
3136 	return NULL;
3137 }
3138 
3139 static const struct got_error *
3140 tree_view_walk_path(struct tog_tree_view_state *s,
3141     struct got_commit_object *commit, const char *path)
3142 {
3143 	const struct got_error *err = NULL;
3144 	struct got_tree_object *tree = NULL;
3145 	const char *p;
3146 	char *slash, *subpath = NULL;
3147 
3148 	/* Walk the path and open corresponding tree objects. */
3149 	p = path;
3150 	while (*p) {
3151 		struct got_tree_entry *te;
3152 		struct got_object_id *tree_id;
3153 		char *te_name;
3154 
3155 		while (p[0] == '/')
3156 			p++;
3157 
3158 		/* Ensure the correct subtree entry is selected. */
3159 		slash = strchr(p, '/');
3160 		if (slash == NULL)
3161 			te_name = strdup(p);
3162 		else
3163 			te_name = strndup(p, slash - p);
3164 		if (te_name == NULL) {
3165 			err = got_error_from_errno("strndup");
3166 			break;
3167 		}
3168 		te = got_object_tree_find_entry(s->tree, te_name);
3169 		if (te == NULL) {
3170 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
3171 			free(te_name);
3172 			break;
3173 		}
3174 		free(te_name);
3175 		s->first_displayed_entry = s->selected_entry = te;
3176 
3177 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
3178 			break; /* jump to this file's entry */
3179 
3180 		slash = strchr(p, '/');
3181 		if (slash)
3182 			subpath = strndup(path, slash - path);
3183 		else
3184 			subpath = strdup(path);
3185 		if (subpath == NULL) {
3186 			err = got_error_from_errno("strdup");
3187 			break;
3188 		}
3189 
3190 		err = got_object_id_by_path(&tree_id, s->repo, commit,
3191 		    subpath);
3192 		if (err)
3193 			break;
3194 
3195 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
3196 		free(tree_id);
3197 		if (err)
3198 			break;
3199 
3200 		err = tree_view_visit_subtree(s, tree);
3201 		if (err) {
3202 			got_object_tree_close(tree);
3203 			break;
3204 		}
3205 		if (slash == NULL)
3206 			break;
3207 		free(subpath);
3208 		subpath = NULL;
3209 		p = slash;
3210 	}
3211 
3212 	free(subpath);
3213 	return err;
3214 }
3215 
3216 static const struct got_error *
3217 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
3218     struct commit_queue_entry *entry, const char *path,
3219     const char *head_ref_name, struct got_repository *repo)
3220 {
3221 	const struct got_error *err = NULL;
3222 	struct tog_tree_view_state *s;
3223 	struct tog_view *tree_view;
3224 
3225 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
3226 	if (tree_view == NULL)
3227 		return got_error_from_errno("view_open");
3228 
3229 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
3230 	if (err)
3231 		return err;
3232 	s = &tree_view->state.tree;
3233 
3234 	*new_view = tree_view;
3235 
3236 	if (got_path_is_root_dir(path))
3237 		return NULL;
3238 
3239 	return tree_view_walk_path(s, entry->commit, path);
3240 }
3241 
3242 static const struct got_error *
3243 block_signals_used_by_main_thread(void)
3244 {
3245 	sigset_t sigset;
3246 	int errcode;
3247 
3248 	if (sigemptyset(&sigset) == -1)
3249 		return got_error_from_errno("sigemptyset");
3250 
3251 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
3252 	if (sigaddset(&sigset, SIGWINCH) == -1)
3253 		return got_error_from_errno("sigaddset");
3254 	if (sigaddset(&sigset, SIGCONT) == -1)
3255 		return got_error_from_errno("sigaddset");
3256 	if (sigaddset(&sigset, SIGINT) == -1)
3257 		return got_error_from_errno("sigaddset");
3258 	if (sigaddset(&sigset, SIGTERM) == -1)
3259 		return got_error_from_errno("sigaddset");
3260 
3261 	/* ncurses handles SIGTSTP */
3262 	if (sigaddset(&sigset, SIGTSTP) == -1)
3263 		return got_error_from_errno("sigaddset");
3264 
3265 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
3266 	if (errcode)
3267 		return got_error_set_errno(errcode, "pthread_sigmask");
3268 
3269 	return NULL;
3270 }
3271 
3272 static void *
3273 log_thread(void *arg)
3274 {
3275 	const struct got_error *err = NULL;
3276 	int errcode = 0;
3277 	struct tog_log_thread_args *a = arg;
3278 	int done = 0;
3279 
3280 	/*
3281 	 * Sync startup with main thread such that we begin our
3282 	 * work once view_input() has released the mutex.
3283 	 */
3284 	errcode = pthread_mutex_lock(&tog_mutex);
3285 	if (errcode) {
3286 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
3287 		return (void *)err;
3288 	}
3289 
3290 	err = block_signals_used_by_main_thread();
3291 	if (err) {
3292 		pthread_mutex_unlock(&tog_mutex);
3293 		goto done;
3294 	}
3295 
3296 	while (!done && !err && !tog_fatal_signal_received()) {
3297 		errcode = pthread_mutex_unlock(&tog_mutex);
3298 		if (errcode) {
3299 			err = got_error_set_errno(errcode,
3300 			    "pthread_mutex_unlock");
3301 			goto done;
3302 		}
3303 		err = queue_commits(a);
3304 		if (err) {
3305 			if (err->code != GOT_ERR_ITER_COMPLETED)
3306 				goto done;
3307 			err = NULL;
3308 			done = 1;
3309 		} else if (a->commits_needed > 0 && !a->load_all) {
3310 			if (*a->limiting) {
3311 				if (a->limit_match)
3312 					a->commits_needed--;
3313 			} else
3314 				a->commits_needed--;
3315 		}
3316 
3317 		errcode = pthread_mutex_lock(&tog_mutex);
3318 		if (errcode) {
3319 			err = got_error_set_errno(errcode,
3320 			    "pthread_mutex_lock");
3321 			goto done;
3322 		} else if (*a->quit)
3323 			done = 1;
3324 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
3325 			*a->first_displayed_entry =
3326 			    TAILQ_FIRST(&a->limit_commits->head);
3327 			*a->selected_entry = *a->first_displayed_entry;
3328 		} else if (*a->first_displayed_entry == NULL) {
3329 			*a->first_displayed_entry =
3330 			    TAILQ_FIRST(&a->real_commits->head);
3331 			*a->selected_entry = *a->first_displayed_entry;
3332 		}
3333 
3334 		errcode = pthread_cond_signal(&a->commit_loaded);
3335 		if (errcode) {
3336 			err = got_error_set_errno(errcode,
3337 			    "pthread_cond_signal");
3338 			pthread_mutex_unlock(&tog_mutex);
3339 			goto done;
3340 		}
3341 
3342 		if (done)
3343 			a->commits_needed = 0;
3344 		else {
3345 			if (a->commits_needed == 0 && !a->load_all) {
3346 				errcode = pthread_cond_wait(&a->need_commits,
3347 				    &tog_mutex);
3348 				if (errcode) {
3349 					err = got_error_set_errno(errcode,
3350 					    "pthread_cond_wait");
3351 					pthread_mutex_unlock(&tog_mutex);
3352 					goto done;
3353 				}
3354 				if (*a->quit)
3355 					done = 1;
3356 			}
3357 		}
3358 	}
3359 	a->log_complete = 1;
3360 	errcode = pthread_mutex_unlock(&tog_mutex);
3361 	if (errcode)
3362 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
3363 done:
3364 	if (err) {
3365 		tog_thread_error = 1;
3366 		pthread_cond_signal(&a->commit_loaded);
3367 	}
3368 	return (void *)err;
3369 }
3370 
3371 static const struct got_error *
3372 stop_log_thread(struct tog_log_view_state *s)
3373 {
3374 	const struct got_error *err = NULL, *thread_err = NULL;
3375 	int errcode;
3376 
3377 	if (s->thread) {
3378 		s->quit = 1;
3379 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
3380 		if (errcode)
3381 			return got_error_set_errno(errcode,
3382 			    "pthread_cond_signal");
3383 		errcode = pthread_mutex_unlock(&tog_mutex);
3384 		if (errcode)
3385 			return got_error_set_errno(errcode,
3386 			    "pthread_mutex_unlock");
3387 		errcode = pthread_join(s->thread, (void **)&thread_err);
3388 		if (errcode)
3389 			return got_error_set_errno(errcode, "pthread_join");
3390 		errcode = pthread_mutex_lock(&tog_mutex);
3391 		if (errcode)
3392 			return got_error_set_errno(errcode,
3393 			    "pthread_mutex_lock");
3394 		s->thread = NULL;
3395 	}
3396 
3397 	if (s->thread_args.repo) {
3398 		err = got_repo_close(s->thread_args.repo);
3399 		s->thread_args.repo = NULL;
3400 	}
3401 
3402 	if (s->thread_args.pack_fds) {
3403 		const struct got_error *pack_err =
3404 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
3405 		if (err == NULL)
3406 			err = pack_err;
3407 		s->thread_args.pack_fds = NULL;
3408 	}
3409 
3410 	if (s->thread_args.graph) {
3411 		got_commit_graph_close(s->thread_args.graph);
3412 		s->thread_args.graph = NULL;
3413 	}
3414 
3415 	return err ? err : thread_err;
3416 }
3417 
3418 static const struct got_error *
3419 close_log_view(struct tog_view *view)
3420 {
3421 	const struct got_error *err = NULL;
3422 	struct tog_log_view_state *s = &view->state.log;
3423 	int errcode;
3424 
3425 	err = stop_log_thread(s);
3426 
3427 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
3428 	if (errcode && err == NULL)
3429 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3430 
3431 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
3432 	if (errcode && err == NULL)
3433 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
3434 
3435 	free_commits(&s->limit_commits);
3436 	free_commits(&s->real_commits);
3437 	free(s->in_repo_path);
3438 	s->in_repo_path = NULL;
3439 	free(s->start_id);
3440 	s->start_id = NULL;
3441 	free(s->head_ref_name);
3442 	s->head_ref_name = NULL;
3443 	return err;
3444 }
3445 
3446 /*
3447  * We use two queues to implement the limit feature: first consists of
3448  * commits matching the current limit_regex; second is the real queue
3449  * of all known commits (real_commits). When the user starts limiting,
3450  * we swap queues such that all movement and displaying functionality
3451  * works with very slight change.
3452  */
3453 static const struct got_error *
3454 limit_log_view(struct tog_view *view)
3455 {
3456 	struct tog_log_view_state *s = &view->state.log;
3457 	struct commit_queue_entry *entry;
3458 	struct tog_view	*v = view;
3459 	const struct got_error *err = NULL;
3460 	char pattern[1024];
3461 	int ret;
3462 
3463 	if (view_is_hsplit_top(view))
3464 		v = view->child;
3465 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
3466 		v = view->parent;
3467 
3468 	/* Get the pattern */
3469 	wmove(v->window, v->nlines - 1, 0);
3470 	wclrtoeol(v->window);
3471 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
3472 	nodelay(v->window, FALSE);
3473 	nocbreak();
3474 	echo();
3475 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
3476 	cbreak();
3477 	noecho();
3478 	nodelay(v->window, TRUE);
3479 	if (ret == ERR)
3480 		return NULL;
3481 
3482 	if (*pattern == '\0') {
3483 		/*
3484 		 * Safety measure for the situation where the user
3485 		 * resets limit without previously limiting anything.
3486 		 */
3487 		if (!s->limit_view)
3488 			return NULL;
3489 
3490 		/*
3491 		 * User could have pressed Ctrl+L, which refreshed the
3492 		 * commit queues, it means we can't save previously
3493 		 * (before limit took place) displayed entries,
3494 		 * because they would point to already free'ed memory,
3495 		 * so we are forced to always select first entry of
3496 		 * the queue.
3497 		 */
3498 		s->commits = &s->real_commits;
3499 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3500 		s->selected_entry = s->first_displayed_entry;
3501 		s->selected = 0;
3502 		s->limit_view = 0;
3503 
3504 		return NULL;
3505 	}
3506 
3507 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3508 		return NULL;
3509 
3510 	s->limit_view = 1;
3511 
3512 	/* Clear the screen while loading limit view */
3513 	s->first_displayed_entry = NULL;
3514 	s->last_displayed_entry = NULL;
3515 	s->selected_entry = NULL;
3516 	s->commits = &s->limit_commits;
3517 
3518 	/* Prepare limit queue for new search */
3519 	free_commits(&s->limit_commits);
3520 	s->limit_commits.ncommits = 0;
3521 
3522 	/* First process commits, which are in queue already */
3523 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3524 		int have_match = 0;
3525 
3526 		err = match_commit(&have_match, entry->id,
3527 		    entry->commit, &s->limit_regex);
3528 		if (err)
3529 			return err;
3530 
3531 		if (have_match) {
3532 			struct commit_queue_entry *matched;
3533 
3534 			matched = alloc_commit_queue_entry(entry->commit,
3535 			    entry->id);
3536 			if (matched == NULL) {
3537 				err = got_error_from_errno(
3538 				    "alloc_commit_queue_entry");
3539 				break;
3540 			}
3541 			matched->commit = entry->commit;
3542 			got_object_commit_retain(entry->commit);
3543 
3544 			matched->idx = s->limit_commits.ncommits;
3545 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3546 			    matched, entry);
3547 			s->limit_commits.ncommits++;
3548 		}
3549 	}
3550 
3551 	/* Second process all the commits, until we fill the screen */
3552 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3553 	    !s->thread_args.log_complete) {
3554 		s->thread_args.commits_needed +=
3555 		    view->nlines - s->limit_commits.ncommits - 1;
3556 		err = trigger_log_thread(view, 1);
3557 		if (err)
3558 			return err;
3559 	}
3560 
3561 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3562 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3563 	s->selected = 0;
3564 
3565 	return NULL;
3566 }
3567 
3568 static const struct got_error *
3569 search_start_log_view(struct tog_view *view)
3570 {
3571 	struct tog_log_view_state *s = &view->state.log;
3572 
3573 	s->matched_entry = NULL;
3574 	s->search_entry = NULL;
3575 	return NULL;
3576 }
3577 
3578 static const struct got_error *
3579 search_next_log_view(struct tog_view *view)
3580 {
3581 	const struct got_error *err = NULL;
3582 	struct tog_log_view_state *s = &view->state.log;
3583 	struct commit_queue_entry *entry;
3584 
3585 	/* Display progress update in log view. */
3586 	show_log_view(view);
3587 	update_panels();
3588 	doupdate();
3589 
3590 	if (s->search_entry) {
3591 		int errcode, ch;
3592 		errcode = pthread_mutex_unlock(&tog_mutex);
3593 		if (errcode)
3594 			return got_error_set_errno(errcode,
3595 			    "pthread_mutex_unlock");
3596 		ch = wgetch(view->window);
3597 		errcode = pthread_mutex_lock(&tog_mutex);
3598 		if (errcode)
3599 			return got_error_set_errno(errcode,
3600 			    "pthread_mutex_lock");
3601 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3602 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3603 			return NULL;
3604 		}
3605 		if (view->searching == TOG_SEARCH_FORWARD)
3606 			entry = TAILQ_NEXT(s->search_entry, entry);
3607 		else
3608 			entry = TAILQ_PREV(s->search_entry,
3609 			    commit_queue_head, entry);
3610 	} else if (s->matched_entry) {
3611 		/*
3612 		 * If the user has moved the cursor after we hit a match,
3613 		 * the position from where we should continue searching
3614 		 * might have changed.
3615 		 */
3616 		if (view->searching == TOG_SEARCH_FORWARD)
3617 			entry = TAILQ_NEXT(s->selected_entry, entry);
3618 		else
3619 			entry = TAILQ_PREV(s->selected_entry, commit_queue_head,
3620 			    entry);
3621 	} else {
3622 		entry = s->selected_entry;
3623 	}
3624 
3625 	while (1) {
3626 		int have_match = 0;
3627 
3628 		if (entry == NULL) {
3629 			if (s->thread_args.log_complete ||
3630 			    view->searching == TOG_SEARCH_BACKWARD) {
3631 				view->search_next_done =
3632 				    (s->matched_entry == NULL ?
3633 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3634 				s->search_entry = NULL;
3635 				return NULL;
3636 			}
3637 			/*
3638 			 * Poke the log thread for more commits and return,
3639 			 * allowing the main loop to make progress. Search
3640 			 * will resume at s->search_entry once we come back.
3641 			 */
3642 			s->thread_args.commits_needed++;
3643 			return trigger_log_thread(view, 0);
3644 		}
3645 
3646 		err = match_commit(&have_match, entry->id, entry->commit,
3647 		    &view->regex);
3648 		if (err)
3649 			break;
3650 		if (have_match) {
3651 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3652 			s->matched_entry = entry;
3653 			break;
3654 		}
3655 
3656 		s->search_entry = entry;
3657 		if (view->searching == TOG_SEARCH_FORWARD)
3658 			entry = TAILQ_NEXT(entry, entry);
3659 		else
3660 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3661 	}
3662 
3663 	if (s->matched_entry) {
3664 		int cur = s->selected_entry->idx;
3665 		while (cur < s->matched_entry->idx) {
3666 			err = input_log_view(NULL, view, KEY_DOWN);
3667 			if (err)
3668 				return err;
3669 			cur++;
3670 		}
3671 		while (cur > s->matched_entry->idx) {
3672 			err = input_log_view(NULL, view, KEY_UP);
3673 			if (err)
3674 				return err;
3675 			cur--;
3676 		}
3677 	}
3678 
3679 	s->search_entry = NULL;
3680 
3681 	return NULL;
3682 }
3683 
3684 static const struct got_error *
3685 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3686     struct got_repository *repo, const char *head_ref_name,
3687     const char *in_repo_path, int log_branches)
3688 {
3689 	const struct got_error *err = NULL;
3690 	struct tog_log_view_state *s = &view->state.log;
3691 	struct got_repository *thread_repo = NULL;
3692 	struct got_commit_graph *thread_graph = NULL;
3693 	int errcode;
3694 
3695 	if (in_repo_path != s->in_repo_path) {
3696 		free(s->in_repo_path);
3697 		s->in_repo_path = strdup(in_repo_path);
3698 		if (s->in_repo_path == NULL) {
3699 			err = got_error_from_errno("strdup");
3700 			goto done;
3701 		}
3702 	}
3703 
3704 	/* The commit queue only contains commits being displayed. */
3705 	TAILQ_INIT(&s->real_commits.head);
3706 	s->real_commits.ncommits = 0;
3707 	s->commits = &s->real_commits;
3708 
3709 	TAILQ_INIT(&s->limit_commits.head);
3710 	s->limit_view = 0;
3711 	s->limit_commits.ncommits = 0;
3712 
3713 	s->repo = repo;
3714 	if (head_ref_name) {
3715 		s->head_ref_name = strdup(head_ref_name);
3716 		if (s->head_ref_name == NULL) {
3717 			err = got_error_from_errno("strdup");
3718 			goto done;
3719 		}
3720 	}
3721 	s->start_id = got_object_id_dup(start_id);
3722 	if (s->start_id == NULL) {
3723 		err = got_error_from_errno("got_object_id_dup");
3724 		goto done;
3725 	}
3726 	s->log_branches = log_branches;
3727 	s->use_committer = 1;
3728 
3729 	STAILQ_INIT(&s->colors);
3730 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3731 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3732 		    get_color_value("TOG_COLOR_COMMIT"));
3733 		if (err)
3734 			goto done;
3735 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3736 		    get_color_value("TOG_COLOR_AUTHOR"));
3737 		if (err) {
3738 			free_colors(&s->colors);
3739 			goto done;
3740 		}
3741 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3742 		    get_color_value("TOG_COLOR_DATE"));
3743 		if (err) {
3744 			free_colors(&s->colors);
3745 			goto done;
3746 		}
3747 	}
3748 
3749 	view->show = show_log_view;
3750 	view->input = input_log_view;
3751 	view->resize = resize_log_view;
3752 	view->close = close_log_view;
3753 	view->search_start = search_start_log_view;
3754 	view->search_next = search_next_log_view;
3755 
3756 	if (s->thread_args.pack_fds == NULL) {
3757 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3758 		if (err)
3759 			goto done;
3760 	}
3761 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3762 	    s->thread_args.pack_fds);
3763 	if (err)
3764 		goto done;
3765 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3766 	    !s->log_branches);
3767 	if (err)
3768 		goto done;
3769 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3770 	    s->repo, NULL, NULL);
3771 	if (err)
3772 		goto done;
3773 
3774 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3775 	if (errcode) {
3776 		err = got_error_set_errno(errcode, "pthread_cond_init");
3777 		goto done;
3778 	}
3779 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3780 	if (errcode) {
3781 		err = got_error_set_errno(errcode, "pthread_cond_init");
3782 		goto done;
3783 	}
3784 
3785 	s->thread_args.commits_needed = view->nlines;
3786 	s->thread_args.graph = thread_graph;
3787 	s->thread_args.real_commits = &s->real_commits;
3788 	s->thread_args.limit_commits = &s->limit_commits;
3789 	s->thread_args.in_repo_path = s->in_repo_path;
3790 	s->thread_args.start_id = s->start_id;
3791 	s->thread_args.repo = thread_repo;
3792 	s->thread_args.log_complete = 0;
3793 	s->thread_args.quit = &s->quit;
3794 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3795 	s->thread_args.selected_entry = &s->selected_entry;
3796 	s->thread_args.searching = &view->searching;
3797 	s->thread_args.search_next_done = &view->search_next_done;
3798 	s->thread_args.regex = &view->regex;
3799 	s->thread_args.limiting = &s->limit_view;
3800 	s->thread_args.limit_regex = &s->limit_regex;
3801 	s->thread_args.limit_commits = &s->limit_commits;
3802 done:
3803 	if (err) {
3804 		if (view->close == NULL)
3805 			close_log_view(view);
3806 		view_close(view);
3807 	}
3808 	return err;
3809 }
3810 
3811 static const struct got_error *
3812 show_log_view(struct tog_view *view)
3813 {
3814 	const struct got_error *err;
3815 	struct tog_log_view_state *s = &view->state.log;
3816 
3817 	if (s->thread == NULL) {
3818 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3819 		    &s->thread_args);
3820 		if (errcode)
3821 			return got_error_set_errno(errcode, "pthread_create");
3822 		if (s->thread_args.commits_needed > 0) {
3823 			err = trigger_log_thread(view, 1);
3824 			if (err)
3825 				return err;
3826 		}
3827 	}
3828 
3829 	return draw_commits(view);
3830 }
3831 
3832 static void
3833 log_move_cursor_up(struct tog_view *view, int page, int home)
3834 {
3835 	struct tog_log_view_state *s = &view->state.log;
3836 
3837 	if (s->first_displayed_entry == NULL)
3838 		return;
3839 	if (s->selected_entry->idx == 0)
3840 		view->count = 0;
3841 
3842 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3843 	    || home)
3844 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3845 
3846 	if (!page && !home && s->selected > 0)
3847 		--s->selected;
3848 	else
3849 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3850 
3851 	select_commit(s);
3852 	return;
3853 }
3854 
3855 static const struct got_error *
3856 log_move_cursor_down(struct tog_view *view, int page)
3857 {
3858 	struct tog_log_view_state	*s = &view->state.log;
3859 	const struct got_error		*err = NULL;
3860 	int				 eos = view->nlines - 2;
3861 
3862 	if (s->first_displayed_entry == NULL)
3863 		return NULL;
3864 
3865 	if (s->thread_args.log_complete &&
3866 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3867 		return NULL;
3868 
3869 	if (view_is_hsplit_top(view))
3870 		--eos;  /* border consumes the last line */
3871 
3872 	if (!page) {
3873 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3874 			++s->selected;
3875 		else
3876 			err = log_scroll_down(view, 1);
3877 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3878 		struct commit_queue_entry *entry;
3879 		int n;
3880 
3881 		s->selected = 0;
3882 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3883 		s->last_displayed_entry = entry;
3884 		for (n = 0; n <= eos; n++) {
3885 			if (entry == NULL)
3886 				break;
3887 			s->first_displayed_entry = entry;
3888 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3889 		}
3890 		if (n > 0)
3891 			s->selected = n - 1;
3892 	} else {
3893 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3894 		    s->thread_args.log_complete)
3895 			s->selected += MIN(page,
3896 			    s->commits->ncommits - s->selected_entry->idx - 1);
3897 		else
3898 			err = log_scroll_down(view, page);
3899 	}
3900 	if (err)
3901 		return err;
3902 
3903 	/*
3904 	 * We might necessarily overshoot in horizontal
3905 	 * splits; if so, select the last displayed commit.
3906 	 */
3907 	if (s->first_displayed_entry && s->last_displayed_entry) {
3908 		s->selected = MIN(s->selected,
3909 		    s->last_displayed_entry->idx -
3910 		    s->first_displayed_entry->idx);
3911 	}
3912 
3913 	select_commit(s);
3914 
3915 	if (s->thread_args.log_complete &&
3916 	    s->selected_entry->idx == s->commits->ncommits - 1)
3917 		view->count = 0;
3918 
3919 	return NULL;
3920 }
3921 
3922 static void
3923 view_get_split(struct tog_view *view, int *y, int *x)
3924 {
3925 	*x = 0;
3926 	*y = 0;
3927 
3928 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3929 		if (view->child && view->child->resized_y)
3930 			*y = view->child->resized_y;
3931 		else if (view->resized_y)
3932 			*y = view->resized_y;
3933 		else
3934 			*y = view_split_begin_y(view->lines);
3935 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3936 		if (view->child && view->child->resized_x)
3937 			*x = view->child->resized_x;
3938 		else if (view->resized_x)
3939 			*x = view->resized_x;
3940 		else
3941 			*x = view_split_begin_x(view->begin_x);
3942 	}
3943 }
3944 
3945 /* Split view horizontally at y and offset view->state->selected line. */
3946 static const struct got_error *
3947 view_init_hsplit(struct tog_view *view, int y)
3948 {
3949 	const struct got_error *err = NULL;
3950 
3951 	view->nlines = y;
3952 	view->ncols = COLS;
3953 	err = view_resize(view);
3954 	if (err)
3955 		return err;
3956 
3957 	err = offset_selection_down(view);
3958 
3959 	return err;
3960 }
3961 
3962 static const struct got_error *
3963 log_goto_line(struct tog_view *view, int nlines)
3964 {
3965 	const struct got_error		*err = NULL;
3966 	struct tog_log_view_state	*s = &view->state.log;
3967 	int				 g, idx = s->selected_entry->idx;
3968 
3969 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3970 		return NULL;
3971 
3972 	g = view->gline;
3973 	view->gline = 0;
3974 
3975 	if (g >= s->first_displayed_entry->idx + 1 &&
3976 	    g <= s->last_displayed_entry->idx + 1 &&
3977 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3978 		s->selected = g - s->first_displayed_entry->idx - 1;
3979 		select_commit(s);
3980 		return NULL;
3981 	}
3982 
3983 	if (idx + 1 < g) {
3984 		err = log_move_cursor_down(view, g - idx - 1);
3985 		if (!err && g > s->selected_entry->idx + 1)
3986 			err = log_move_cursor_down(view,
3987 			    g - s->first_displayed_entry->idx - 1);
3988 		if (err)
3989 			return err;
3990 	} else if (idx + 1 > g)
3991 		log_move_cursor_up(view, idx - g + 1, 0);
3992 
3993 	if (g < nlines && s->first_displayed_entry->idx == 0)
3994 		s->selected = g - 1;
3995 
3996 	select_commit(s);
3997 	return NULL;
3998 
3999 }
4000 
4001 static void
4002 horizontal_scroll_input(struct tog_view *view, int ch)
4003 {
4004 
4005 	switch (ch) {
4006 	case KEY_LEFT:
4007 	case 'h':
4008 		view->x -= MIN(view->x, 2);
4009 		if (view->x <= 0)
4010 			view->count = 0;
4011 		break;
4012 	case KEY_RIGHT:
4013 	case 'l':
4014 		if (view->x + view->ncols / 2 < view->maxx)
4015 			view->x += 2;
4016 		else
4017 			view->count = 0;
4018 		break;
4019 	case '0':
4020 		view->x = 0;
4021 		break;
4022 	case '$':
4023 		view->x = MAX(view->maxx - view->ncols / 2, 0);
4024 		view->count = 0;
4025 		break;
4026 	default:
4027 		break;
4028 	}
4029 }
4030 
4031 static const struct got_error *
4032 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
4033 {
4034 	const struct got_error *err = NULL;
4035 	struct tog_log_view_state *s = &view->state.log;
4036 	int eos, nscroll;
4037 
4038 	if (s->thread_args.load_all) {
4039 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
4040 			s->thread_args.load_all = 0;
4041 		else if (s->thread_args.log_complete) {
4042 			err = log_move_cursor_down(view, s->commits->ncommits);
4043 			s->thread_args.load_all = 0;
4044 		}
4045 		if (err)
4046 			return err;
4047 	}
4048 
4049 	eos = nscroll = view->nlines - 1;
4050 	if (view_is_hsplit_top(view))
4051 		--eos;  /* border */
4052 
4053 	if (view->gline)
4054 		return log_goto_line(view, eos);
4055 
4056 	switch (ch) {
4057 	case '&':
4058 		err = limit_log_view(view);
4059 		break;
4060 	case 'q':
4061 		s->quit = 1;
4062 		break;
4063 	case '0':
4064 	case '$':
4065 	case KEY_RIGHT:
4066 	case 'l':
4067 	case KEY_LEFT:
4068 	case 'h':
4069 		horizontal_scroll_input(view, ch);
4070 		break;
4071 	case 'k':
4072 	case KEY_UP:
4073 	case '<':
4074 	case ',':
4075 	case CTRL('p'):
4076 		log_move_cursor_up(view, 0, 0);
4077 		break;
4078 	case 'g':
4079 	case '=':
4080 	case KEY_HOME:
4081 		log_move_cursor_up(view, 0, 1);
4082 		view->count = 0;
4083 		break;
4084 	case CTRL('u'):
4085 	case 'u':
4086 		nscroll /= 2;
4087 		/* FALL THROUGH */
4088 	case KEY_PPAGE:
4089 	case CTRL('b'):
4090 	case 'b':
4091 		log_move_cursor_up(view, nscroll, 0);
4092 		break;
4093 	case 'j':
4094 	case KEY_DOWN:
4095 	case '>':
4096 	case '.':
4097 	case CTRL('n'):
4098 		err = log_move_cursor_down(view, 0);
4099 		break;
4100 	case '@':
4101 		s->use_committer = !s->use_committer;
4102 		view->action = s->use_committer ?
4103 		    "show committer" : "show commit author";
4104 		break;
4105 	case 'G':
4106 	case '*':
4107 	case KEY_END: {
4108 		/* We don't know yet how many commits, so we're forced to
4109 		 * traverse them all. */
4110 		view->count = 0;
4111 		s->thread_args.load_all = 1;
4112 		if (!s->thread_args.log_complete)
4113 			return trigger_log_thread(view, 0);
4114 		err = log_move_cursor_down(view, s->commits->ncommits);
4115 		s->thread_args.load_all = 0;
4116 		break;
4117 	}
4118 	case CTRL('d'):
4119 	case 'd':
4120 		nscroll /= 2;
4121 		/* FALL THROUGH */
4122 	case KEY_NPAGE:
4123 	case CTRL('f'):
4124 	case 'f':
4125 	case ' ':
4126 		err = log_move_cursor_down(view, nscroll);
4127 		break;
4128 	case KEY_RESIZE:
4129 		if (s->selected > view->nlines - 2)
4130 			s->selected = view->nlines - 2;
4131 		if (s->selected > s->commits->ncommits - 1)
4132 			s->selected = s->commits->ncommits - 1;
4133 		select_commit(s);
4134 		if (s->commits->ncommits < view->nlines - 1 &&
4135 		    !s->thread_args.log_complete) {
4136 			s->thread_args.commits_needed += (view->nlines - 1) -
4137 			    s->commits->ncommits;
4138 			err = trigger_log_thread(view, 1);
4139 		}
4140 		break;
4141 	case KEY_ENTER:
4142 	case '\r':
4143 		view->count = 0;
4144 		if (s->selected_entry == NULL)
4145 			break;
4146 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
4147 		break;
4148 	case 'T':
4149 		view->count = 0;
4150 		if (s->selected_entry == NULL)
4151 			break;
4152 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
4153 		break;
4154 	case KEY_BACKSPACE:
4155 	case CTRL('l'):
4156 	case 'B':
4157 		view->count = 0;
4158 		if (ch == KEY_BACKSPACE &&
4159 		    got_path_is_root_dir(s->in_repo_path))
4160 			break;
4161 		err = stop_log_thread(s);
4162 		if (err)
4163 			return err;
4164 		if (ch == KEY_BACKSPACE) {
4165 			char *parent_path;
4166 			err = got_path_dirname(&parent_path, s->in_repo_path);
4167 			if (err)
4168 				return err;
4169 			free(s->in_repo_path);
4170 			s->in_repo_path = parent_path;
4171 			s->thread_args.in_repo_path = s->in_repo_path;
4172 		} else if (ch == CTRL('l')) {
4173 			struct got_object_id *start_id;
4174 			err = got_repo_match_object_id(&start_id, NULL,
4175 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
4176 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
4177 			if (err) {
4178 				if (s->head_ref_name == NULL ||
4179 				    err->code != GOT_ERR_NOT_REF)
4180 					return err;
4181 				/* Try to cope with deleted references. */
4182 				free(s->head_ref_name);
4183 				s->head_ref_name = NULL;
4184 				err = got_repo_match_object_id(&start_id,
4185 				    NULL, GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT,
4186 				    &tog_refs, s->repo);
4187 				if (err)
4188 					return err;
4189 			}
4190 			free(s->start_id);
4191 			s->start_id = start_id;
4192 			s->thread_args.start_id = s->start_id;
4193 		} else /* 'B' */
4194 			s->log_branches = !s->log_branches;
4195 
4196 		if (s->thread_args.pack_fds == NULL) {
4197 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
4198 			if (err)
4199 				return err;
4200 		}
4201 		err = got_repo_open(&s->thread_args.repo,
4202 		    got_repo_get_path(s->repo), NULL,
4203 		    s->thread_args.pack_fds);
4204 		if (err)
4205 			return err;
4206 		tog_free_refs();
4207 		err = tog_load_refs(s->repo, 0);
4208 		if (err)
4209 			return err;
4210 		err = got_commit_graph_open(&s->thread_args.graph,
4211 		    s->in_repo_path, !s->log_branches);
4212 		if (err)
4213 			return err;
4214 		err = got_commit_graph_iter_start(s->thread_args.graph,
4215 		    s->start_id, s->repo, NULL, NULL);
4216 		if (err)
4217 			return err;
4218 		free_commits(&s->real_commits);
4219 		free_commits(&s->limit_commits);
4220 		s->first_displayed_entry = NULL;
4221 		s->last_displayed_entry = NULL;
4222 		s->selected_entry = NULL;
4223 		s->selected = 0;
4224 		s->thread_args.log_complete = 0;
4225 		s->quit = 0;
4226 		s->thread_args.commits_needed = view->lines;
4227 		s->matched_entry = NULL;
4228 		s->search_entry = NULL;
4229 		view->offset = 0;
4230 		break;
4231 	case 'R':
4232 		view->count = 0;
4233 		err = view_request_new(new_view, view, TOG_VIEW_REF);
4234 		break;
4235 	default:
4236 		view->count = 0;
4237 		break;
4238 	}
4239 
4240 	return err;
4241 }
4242 
4243 static const struct got_error *
4244 apply_unveil(const char *repo_path, const char *worktree_path)
4245 {
4246 	const struct got_error *error;
4247 
4248 #ifdef PROFILE
4249 	if (unveil("gmon.out", "rwc") != 0)
4250 		return got_error_from_errno2("unveil", "gmon.out");
4251 #endif
4252 	if (repo_path && unveil(repo_path, "r") != 0)
4253 		return got_error_from_errno2("unveil", repo_path);
4254 
4255 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
4256 		return got_error_from_errno2("unveil", worktree_path);
4257 
4258 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
4259 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
4260 
4261 	error = got_privsep_unveil_exec_helpers();
4262 	if (error != NULL)
4263 		return error;
4264 
4265 	if (unveil(NULL, NULL) != 0)
4266 		return got_error_from_errno("unveil");
4267 
4268 	return NULL;
4269 }
4270 
4271 static const struct got_error *
4272 init_mock_term(const char *test_script_path)
4273 {
4274 	const struct got_error	*err = NULL;
4275 	const char *screen_dump_path;
4276 	int in;
4277 
4278 	if (test_script_path == NULL || *test_script_path == '\0')
4279 		return got_error_msg(GOT_ERR_IO, "TOG_TEST_SCRIPT not defined");
4280 
4281 	tog_io.f = fopen(test_script_path, "re");
4282 	if (tog_io.f == NULL) {
4283 		err = got_error_from_errno_fmt("fopen: %s",
4284 		    test_script_path);
4285 		goto done;
4286 	}
4287 
4288 	/* test mode, we don't want any output */
4289 	tog_io.cout = fopen("/dev/null", "w+");
4290 	if (tog_io.cout == NULL) {
4291 		err = got_error_from_errno2("fopen", "/dev/null");
4292 		goto done;
4293 	}
4294 
4295 	in = dup(fileno(tog_io.cout));
4296 	if (in == -1) {
4297 		err = got_error_from_errno("dup");
4298 		goto done;
4299 	}
4300 	tog_io.cin = fdopen(in, "r");
4301 	if (tog_io.cin == NULL) {
4302 		err = got_error_from_errno("fdopen");
4303 		close(in);
4304 		goto done;
4305 	}
4306 
4307 	screen_dump_path = getenv("TOG_SCR_DUMP");
4308 	if (screen_dump_path == NULL || *screen_dump_path == '\0')
4309 		return got_error_msg(GOT_ERR_IO, "TOG_SCR_DUMP not defined");
4310 	tog_io.sdump = fopen(screen_dump_path, "we");
4311 	if (tog_io.sdump == NULL) {
4312 		err = got_error_from_errno2("fopen", screen_dump_path);
4313 		goto done;
4314 	}
4315 
4316 	if (fseeko(tog_io.f, 0L, SEEK_SET) == -1) {
4317 		err = got_error_from_errno("fseeko");
4318 		goto done;
4319 	}
4320 
4321 	if (newterm(NULL, tog_io.cout, tog_io.cin) == NULL)
4322 		err = got_error_msg(GOT_ERR_IO,
4323 		    "newterm: failed to initialise curses");
4324 
4325 	using_mock_io = 1;
4326 
4327 done:
4328 	if (err)
4329 		tog_io_close();
4330 	return err;
4331 }
4332 
4333 static void
4334 init_curses(void)
4335 {
4336 	/*
4337 	 * Override default signal handlers before starting ncurses.
4338 	 * This should prevent ncurses from installing its own
4339 	 * broken cleanup() signal handler.
4340 	 */
4341 	signal(SIGWINCH, tog_sigwinch);
4342 	signal(SIGPIPE, tog_sigpipe);
4343 	signal(SIGCONT, tog_sigcont);
4344 	signal(SIGINT, tog_sigint);
4345 	signal(SIGTERM, tog_sigterm);
4346 
4347 	if (using_mock_io) /* In test mode we use a fake terminal */
4348 		return;
4349 
4350 	initscr();
4351 
4352 	cbreak();
4353 	halfdelay(1); /* Fast refresh while initial view is loading. */
4354 	noecho();
4355 	nonl();
4356 	intrflush(stdscr, FALSE);
4357 	keypad(stdscr, TRUE);
4358 	curs_set(0);
4359 	if (getenv("TOG_COLORS") != NULL) {
4360 		start_color();
4361 		use_default_colors();
4362 	}
4363 
4364 	return;
4365 }
4366 
4367 static const struct got_error *
4368 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
4369     struct got_repository *repo, struct got_worktree *worktree)
4370 {
4371 	const struct got_error *err = NULL;
4372 
4373 	if (argc == 0) {
4374 		*in_repo_path = strdup("/");
4375 		if (*in_repo_path == NULL)
4376 			return got_error_from_errno("strdup");
4377 		return NULL;
4378 	}
4379 
4380 	if (worktree) {
4381 		const char *prefix = got_worktree_get_path_prefix(worktree);
4382 		char *p;
4383 
4384 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
4385 		if (err)
4386 			return err;
4387 		if (asprintf(in_repo_path, "%s%s%s", prefix,
4388 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
4389 		    p) == -1) {
4390 			err = got_error_from_errno("asprintf");
4391 			*in_repo_path = NULL;
4392 		}
4393 		free(p);
4394 	} else
4395 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
4396 
4397 	return err;
4398 }
4399 
4400 static const struct got_error *
4401 cmd_log(int argc, char *argv[])
4402 {
4403 	const struct got_error *error;
4404 	struct got_repository *repo = NULL;
4405 	struct got_worktree *worktree = NULL;
4406 	struct got_object_id *start_id = NULL;
4407 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
4408 	char *keyword_idstr = NULL, *start_commit = NULL, *label = NULL;
4409 	struct got_reference *ref = NULL;
4410 	const char *head_ref_name = NULL;
4411 	int ch, log_branches = 0;
4412 	struct tog_view *view;
4413 	int *pack_fds = NULL;
4414 
4415 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
4416 		switch (ch) {
4417 		case 'b':
4418 			log_branches = 1;
4419 			break;
4420 		case 'c':
4421 			start_commit = optarg;
4422 			break;
4423 		case 'r':
4424 			repo_path = realpath(optarg, NULL);
4425 			if (repo_path == NULL)
4426 				return got_error_from_errno2("realpath",
4427 				    optarg);
4428 			break;
4429 		default:
4430 			usage_log();
4431 			/* NOTREACHED */
4432 		}
4433 	}
4434 
4435 	argc -= optind;
4436 	argv += optind;
4437 
4438 	if (argc > 1)
4439 		usage_log();
4440 
4441 	error = got_repo_pack_fds_open(&pack_fds);
4442 	if (error != NULL)
4443 		goto done;
4444 
4445 	if (repo_path == NULL) {
4446 		cwd = getcwd(NULL, 0);
4447 		if (cwd == NULL)
4448 			return got_error_from_errno("getcwd");
4449 		error = got_worktree_open(&worktree, cwd, NULL);
4450 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
4451 			goto done;
4452 		if (worktree)
4453 			repo_path =
4454 			    strdup(got_worktree_get_repo_path(worktree));
4455 		else
4456 			repo_path = strdup(cwd);
4457 		if (repo_path == NULL) {
4458 			error = got_error_from_errno("strdup");
4459 			goto done;
4460 		}
4461 	}
4462 
4463 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
4464 	if (error != NULL)
4465 		goto done;
4466 
4467 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
4468 	    repo, worktree);
4469 	if (error)
4470 		goto done;
4471 
4472 	init_curses();
4473 
4474 	error = apply_unveil(got_repo_get_path(repo),
4475 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
4476 	if (error)
4477 		goto done;
4478 
4479 	/* already loaded by tog_log_with_path()? */
4480 	if (TAILQ_EMPTY(&tog_refs)) {
4481 		error = tog_load_refs(repo, 0);
4482 		if (error)
4483 			goto done;
4484 	}
4485 
4486 	if (start_commit == NULL) {
4487 		error = got_repo_match_object_id(&start_id, &label,
4488 		    worktree ? got_worktree_get_head_ref_name(worktree) :
4489 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4490 		if (error)
4491 			goto done;
4492 		head_ref_name = label;
4493 	} else {
4494 		error = got_keyword_to_idstr(&keyword_idstr, start_commit,
4495 		    repo, worktree);
4496 		if (error != NULL)
4497 			goto done;
4498 		if (keyword_idstr != NULL)
4499 			start_commit = keyword_idstr;
4500 
4501 		error = got_ref_open(&ref, repo, start_commit, 0);
4502 		if (error == NULL)
4503 			head_ref_name = got_ref_get_name(ref);
4504 		else if (error->code != GOT_ERR_NOT_REF)
4505 			goto done;
4506 		error = got_repo_match_object_id(&start_id, NULL,
4507 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
4508 		if (error)
4509 			goto done;
4510 	}
4511 
4512 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
4513 	if (view == NULL) {
4514 		error = got_error_from_errno("view_open");
4515 		goto done;
4516 	}
4517 	error = open_log_view(view, start_id, repo, head_ref_name,
4518 	    in_repo_path, log_branches);
4519 	if (error)
4520 		goto done;
4521 	if (worktree) {
4522 		/* Release work tree lock. */
4523 		got_worktree_close(worktree);
4524 		worktree = NULL;
4525 	}
4526 	error = view_loop(view);
4527 done:
4528 	free(keyword_idstr);
4529 	free(in_repo_path);
4530 	free(repo_path);
4531 	free(cwd);
4532 	free(start_id);
4533 	free(label);
4534 	if (ref)
4535 		got_ref_close(ref);
4536 	if (repo) {
4537 		const struct got_error *close_err = got_repo_close(repo);
4538 		if (error == NULL)
4539 			error = close_err;
4540 	}
4541 	if (worktree)
4542 		got_worktree_close(worktree);
4543 	if (pack_fds) {
4544 		const struct got_error *pack_err =
4545 		    got_repo_pack_fds_close(pack_fds);
4546 		if (error == NULL)
4547 			error = pack_err;
4548 	}
4549 	tog_free_refs();
4550 	return error;
4551 }
4552 
4553 __dead static void
4554 usage_diff(void)
4555 {
4556 	endwin();
4557 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
4558 	    "object1 object2\n", getprogname());
4559 	exit(1);
4560 }
4561 
4562 static int
4563 match_line(const char *line, regex_t *regex, size_t nmatch,
4564     regmatch_t *regmatch)
4565 {
4566 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
4567 }
4568 
4569 static struct tog_color *
4570 match_color(struct tog_colors *colors, const char *line)
4571 {
4572 	struct tog_color *tc = NULL;
4573 
4574 	STAILQ_FOREACH(tc, colors, entry) {
4575 		if (match_line(line, &tc->regex, 0, NULL))
4576 			return tc;
4577 	}
4578 
4579 	return NULL;
4580 }
4581 
4582 static const struct got_error *
4583 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
4584     WINDOW *window, int skipcol, regmatch_t *regmatch)
4585 {
4586 	const struct got_error *err = NULL;
4587 	char *exstr = NULL;
4588 	wchar_t *wline = NULL;
4589 	int rme, rms, n, width, scrollx;
4590 	int width0 = 0, width1 = 0, width2 = 0;
4591 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4592 
4593 	*wtotal = 0;
4594 
4595 	rms = regmatch->rm_so;
4596 	rme = regmatch->rm_eo;
4597 
4598 	err = expand_tab(&exstr, line);
4599 	if (err)
4600 		return err;
4601 
4602 	/* Split the line into 3 segments, according to match offsets. */
4603 	seg0 = strndup(exstr, rms);
4604 	if (seg0 == NULL) {
4605 		err = got_error_from_errno("strndup");
4606 		goto done;
4607 	}
4608 	seg1 = strndup(exstr + rms, rme - rms);
4609 	if (seg1 == NULL) {
4610 		err = got_error_from_errno("strndup");
4611 		goto done;
4612 	}
4613 	seg2 = strdup(exstr + rme);
4614 	if (seg2 == NULL) {
4615 		err = got_error_from_errno("strndup");
4616 		goto done;
4617 	}
4618 
4619 	/* draw up to matched token if we haven't scrolled past it */
4620 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4621 	    col_tab_align, 1);
4622 	if (err)
4623 		goto done;
4624 	n = MAX(width0 - skipcol, 0);
4625 	if (n) {
4626 		free(wline);
4627 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4628 		    wlimit, col_tab_align, 1);
4629 		if (err)
4630 			goto done;
4631 		waddwstr(window, &wline[scrollx]);
4632 		wlimit -= width;
4633 		*wtotal += width;
4634 	}
4635 
4636 	if (wlimit > 0) {
4637 		int i = 0, w = 0;
4638 		size_t wlen;
4639 
4640 		free(wline);
4641 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4642 		    col_tab_align, 1);
4643 		if (err)
4644 			goto done;
4645 		wlen = wcslen(wline);
4646 		while (i < wlen) {
4647 			width = wcwidth(wline[i]);
4648 			if (width == -1) {
4649 				/* should not happen, tabs are expanded */
4650 				err = got_error(GOT_ERR_RANGE);
4651 				goto done;
4652 			}
4653 			if (width0 + w + width > skipcol)
4654 				break;
4655 			w += width;
4656 			i++;
4657 		}
4658 		/* draw (visible part of) matched token (if scrolled into it) */
4659 		if (width1 - w > 0) {
4660 			wattron(window, A_STANDOUT);
4661 			waddwstr(window, &wline[i]);
4662 			wattroff(window, A_STANDOUT);
4663 			wlimit -= (width1 - w);
4664 			*wtotal += (width1 - w);
4665 		}
4666 	}
4667 
4668 	if (wlimit > 0) {  /* draw rest of line */
4669 		free(wline);
4670 		if (skipcol > width0 + width1) {
4671 			err = format_line(&wline, &width2, &scrollx, seg2,
4672 			    skipcol - (width0 + width1), wlimit,
4673 			    col_tab_align, 1);
4674 			if (err)
4675 				goto done;
4676 			waddwstr(window, &wline[scrollx]);
4677 		} else {
4678 			err = format_line(&wline, &width2, NULL, seg2, 0,
4679 			    wlimit, col_tab_align, 1);
4680 			if (err)
4681 				goto done;
4682 			waddwstr(window, wline);
4683 		}
4684 		*wtotal += width2;
4685 	}
4686 done:
4687 	free(wline);
4688 	free(exstr);
4689 	free(seg0);
4690 	free(seg1);
4691 	free(seg2);
4692 	return err;
4693 }
4694 
4695 static int
4696 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4697 {
4698 	FILE	*f = NULL;
4699 	int	*eof, *first, *selected;
4700 
4701 	if (view->type == TOG_VIEW_DIFF) {
4702 		struct tog_diff_view_state *s = &view->state.diff;
4703 
4704 		first = &s->first_displayed_line;
4705 		selected = first;
4706 		eof = &s->eof;
4707 		f = s->f;
4708 	} else if (view->type == TOG_VIEW_HELP) {
4709 		struct tog_help_view_state *s = &view->state.help;
4710 
4711 		first = &s->first_displayed_line;
4712 		selected = first;
4713 		eof = &s->eof;
4714 		f = s->f;
4715 	} else if (view->type == TOG_VIEW_BLAME) {
4716 		struct tog_blame_view_state *s = &view->state.blame;
4717 
4718 		first = &s->first_displayed_line;
4719 		selected = &s->selected_line;
4720 		eof = &s->eof;
4721 		f = s->blame.f;
4722 	} else
4723 		return 0;
4724 
4725 	/* Center gline in the middle of the page like vi(1). */
4726 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4727 		return 0;
4728 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4729 		rewind(f);
4730 		*eof = 0;
4731 		*first = 1;
4732 		*lineno = 0;
4733 		*nprinted = 0;
4734 		return 0;
4735 	}
4736 
4737 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4738 		view->gline : (view->nlines - 3) / 2 + 1;
4739 	view->gline = 0;
4740 
4741 	return 1;
4742 }
4743 
4744 static const struct got_error *
4745 draw_file(struct tog_view *view, const char *header)
4746 {
4747 	struct tog_diff_view_state *s = &view->state.diff;
4748 	regmatch_t *regmatch = &view->regmatch;
4749 	const struct got_error *err;
4750 	int nprinted = 0;
4751 	char *line;
4752 	size_t linesize = 0;
4753 	ssize_t linelen;
4754 	wchar_t *wline;
4755 	int width;
4756 	int max_lines = view->nlines;
4757 	int nlines = s->nlines;
4758 	off_t line_offset;
4759 
4760 	s->lineno = s->first_displayed_line - 1;
4761 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4762 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4763 		return got_error_from_errno("fseek");
4764 
4765 	werase(view->window);
4766 
4767 	if (view->gline > s->nlines - 1)
4768 		view->gline = s->nlines - 1;
4769 
4770 	if (header) {
4771 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4772 		    1 : view->gline - (view->nlines - 3) / 2 :
4773 		    s->lineno + s->selected_line;
4774 
4775 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4776 			return got_error_from_errno("asprintf");
4777 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4778 		    0, 0);
4779 		free(line);
4780 		if (err)
4781 			return err;
4782 
4783 		if (view_needs_focus_indication(view))
4784 			wstandout(view->window);
4785 		waddwstr(view->window, wline);
4786 		free(wline);
4787 		wline = NULL;
4788 		while (width++ < view->ncols)
4789 			waddch(view->window, ' ');
4790 		if (view_needs_focus_indication(view))
4791 			wstandend(view->window);
4792 
4793 		if (max_lines <= 1)
4794 			return NULL;
4795 		max_lines--;
4796 	}
4797 
4798 	s->eof = 0;
4799 	view->maxx = 0;
4800 	line = NULL;
4801 	while (max_lines > 0 && nprinted < max_lines) {
4802 		enum got_diff_line_type linetype;
4803 		attr_t attr = 0;
4804 
4805 		linelen = getline(&line, &linesize, s->f);
4806 		if (linelen == -1) {
4807 			if (feof(s->f)) {
4808 				s->eof = 1;
4809 				break;
4810 			}
4811 			free(line);
4812 			return got_ferror(s->f, GOT_ERR_IO);
4813 		}
4814 
4815 		if (++s->lineno < s->first_displayed_line)
4816 			continue;
4817 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4818 			continue;
4819 		if (s->lineno == view->hiline)
4820 			attr = A_STANDOUT;
4821 
4822 		/* Set view->maxx based on full line length. */
4823 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4824 		    view->x ? 1 : 0);
4825 		if (err) {
4826 			free(line);
4827 			return err;
4828 		}
4829 		view->maxx = MAX(view->maxx, width);
4830 		free(wline);
4831 		wline = NULL;
4832 
4833 		linetype = s->lines[s->lineno].type;
4834 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4835 		    linetype < GOT_DIFF_LINE_CONTEXT)
4836 			attr |= COLOR_PAIR(linetype);
4837 		if (attr)
4838 			wattron(view->window, attr);
4839 		if (s->first_displayed_line + nprinted == s->matched_line &&
4840 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4841 			err = add_matched_line(&width, line, view->ncols, 0,
4842 			    view->window, view->x, regmatch);
4843 			if (err) {
4844 				free(line);
4845 				return err;
4846 			}
4847 		} else {
4848 			int skip;
4849 			err = format_line(&wline, &width, &skip, line,
4850 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4851 			if (err) {
4852 				free(line);
4853 				return err;
4854 			}
4855 			waddwstr(view->window, &wline[skip]);
4856 			free(wline);
4857 			wline = NULL;
4858 		}
4859 		if (s->lineno == view->hiline) {
4860 			/* highlight full gline length */
4861 			while (width++ < view->ncols)
4862 				waddch(view->window, ' ');
4863 		} else {
4864 			if (width <= view->ncols - 1)
4865 				waddch(view->window, '\n');
4866 		}
4867 		if (attr)
4868 			wattroff(view->window, attr);
4869 		if (++nprinted == 1)
4870 			s->first_displayed_line = s->lineno;
4871 	}
4872 	free(line);
4873 	if (nprinted >= 1)
4874 		s->last_displayed_line = s->first_displayed_line +
4875 		    (nprinted - 1);
4876 	else
4877 		s->last_displayed_line = s->first_displayed_line;
4878 
4879 	view_border(view);
4880 
4881 	if (s->eof) {
4882 		while (nprinted < view->nlines) {
4883 			waddch(view->window, '\n');
4884 			nprinted++;
4885 		}
4886 
4887 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4888 		    view->ncols, 0, 0);
4889 		if (err) {
4890 			return err;
4891 		}
4892 
4893 		wstandout(view->window);
4894 		waddwstr(view->window, wline);
4895 		free(wline);
4896 		wline = NULL;
4897 		wstandend(view->window);
4898 	}
4899 
4900 	return NULL;
4901 }
4902 
4903 static char *
4904 get_datestr(time_t *time, char *datebuf)
4905 {
4906 	struct tm mytm, *tm;
4907 	char *p, *s;
4908 
4909 	tm = gmtime_r(time, &mytm);
4910 	if (tm == NULL)
4911 		return NULL;
4912 	s = asctime_r(tm, datebuf);
4913 	if (s == NULL)
4914 		return NULL;
4915 	p = strchr(s, '\n');
4916 	if (p)
4917 		*p = '\0';
4918 	return s;
4919 }
4920 
4921 static const struct got_error *
4922 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4923     off_t off, uint8_t type)
4924 {
4925 	struct got_diff_line *p;
4926 
4927 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4928 	if (p == NULL)
4929 		return got_error_from_errno("reallocarray");
4930 	*lines = p;
4931 	(*lines)[*nlines].offset = off;
4932 	(*lines)[*nlines].type = type;
4933 	(*nlines)++;
4934 
4935 	return NULL;
4936 }
4937 
4938 static const struct got_error *
4939 cat_diff(FILE *dst, FILE *src, struct got_diff_line **d_lines, size_t *d_nlines,
4940     struct got_diff_line *s_lines, size_t s_nlines)
4941 {
4942 	struct got_diff_line	*p;
4943 	char			 buf[BUFSIZ];
4944 	size_t			 i, r;
4945 
4946 	if (fseeko(src, 0L, SEEK_SET) == -1)
4947 		return got_error_from_errno("fseeko");
4948 
4949 	for (;;) {
4950 		r = fread(buf, 1, sizeof(buf), src);
4951 		if (r == 0) {
4952 			if (ferror(src))
4953 				return got_error_from_errno("fread");
4954 			if (feof(src))
4955 				break;
4956 		}
4957 		if (fwrite(buf, 1, r, dst) != r)
4958 			return got_ferror(dst, GOT_ERR_IO);
4959 	}
4960 
4961 	if (s_nlines == 0 && *d_nlines == 0)
4962 		return NULL;
4963 
4964 	/*
4965 	 * If commit info was in dst, increment line offsets
4966 	 * of the appended diff content, but skip s_lines[0]
4967 	 * because offset zero is already in *d_lines.
4968 	 */
4969 	if (*d_nlines > 0) {
4970 		for (i = 1; i < s_nlines; ++i)
4971 			s_lines[i].offset += (*d_lines)[*d_nlines - 1].offset;
4972 
4973 		if (s_nlines > 0) {
4974 			--s_nlines;
4975 			++s_lines;
4976 		}
4977 	}
4978 
4979 	p = reallocarray(*d_lines, *d_nlines + s_nlines, sizeof(*p));
4980 	if (p == NULL) {
4981 		/* d_lines is freed in close_diff_view() */
4982 		return got_error_from_errno("reallocarray");
4983 	}
4984 
4985 	*d_lines = p;
4986 
4987 	memcpy(*d_lines + *d_nlines, s_lines, s_nlines * sizeof(*s_lines));
4988 	*d_nlines += s_nlines;
4989 
4990 	return NULL;
4991 }
4992 
4993 static const struct got_error *
4994 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4995     struct got_object_id *commit_id, struct got_reflist_head *refs,
4996     struct got_repository *repo, int ignore_ws, int force_text_diff,
4997     struct got_diffstat_cb_arg *dsa, FILE *outfile)
4998 {
4999 	const struct got_error *err = NULL;
5000 	char datebuf[26], *datestr;
5001 	struct got_commit_object *commit;
5002 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
5003 	time_t committer_time;
5004 	const char *author, *committer;
5005 	char *refs_str = NULL;
5006 	struct got_pathlist_entry *pe;
5007 	off_t outoff = 0;
5008 	int n;
5009 
5010 	err = build_refs_str(&refs_str, refs, commit_id, repo);
5011 	if (err)
5012 		return err;
5013 
5014 	err = got_object_open_as_commit(&commit, repo, commit_id);
5015 	if (err)
5016 		return err;
5017 
5018 	err = got_object_id_str(&id_str, commit_id);
5019 	if (err) {
5020 		err = got_error_from_errno("got_object_id_str");
5021 		goto done;
5022 	}
5023 
5024 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
5025 	if (err)
5026 		goto done;
5027 
5028 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
5029 	    refs_str ? refs_str : "", refs_str ? ")" : "");
5030 	if (n < 0) {
5031 		err = got_error_from_errno("fprintf");
5032 		goto done;
5033 	}
5034 	outoff += n;
5035 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
5036 	if (err)
5037 		goto done;
5038 
5039 	n = fprintf(outfile, "from: %s\n",
5040 	    got_object_commit_get_author(commit));
5041 	if (n < 0) {
5042 		err = got_error_from_errno("fprintf");
5043 		goto done;
5044 	}
5045 	outoff += n;
5046 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
5047 	if (err)
5048 		goto done;
5049 
5050 	author = got_object_commit_get_author(commit);
5051 	committer = got_object_commit_get_committer(commit);
5052 	if (strcmp(author, committer) != 0) {
5053 		n = fprintf(outfile, "via: %s\n", committer);
5054 		if (n < 0) {
5055 			err = got_error_from_errno("fprintf");
5056 			goto done;
5057 		}
5058 		outoff += n;
5059 		err = add_line_metadata(lines, nlines, outoff,
5060 		    GOT_DIFF_LINE_AUTHOR);
5061 		if (err)
5062 			goto done;
5063 	}
5064 	committer_time = got_object_commit_get_committer_time(commit);
5065 	datestr = get_datestr(&committer_time, datebuf);
5066 	if (datestr) {
5067 		n = fprintf(outfile, "date: %s UTC\n", datestr);
5068 		if (n < 0) {
5069 			err = got_error_from_errno("fprintf");
5070 			goto done;
5071 		}
5072 		outoff += n;
5073 		err = add_line_metadata(lines, nlines, outoff,
5074 		    GOT_DIFF_LINE_DATE);
5075 		if (err)
5076 			goto done;
5077 	}
5078 	if (got_object_commit_get_nparents(commit) > 1) {
5079 		const struct got_object_id_queue *parent_ids;
5080 		struct got_object_qid *qid;
5081 		int pn = 1;
5082 		parent_ids = got_object_commit_get_parent_ids(commit);
5083 		STAILQ_FOREACH(qid, parent_ids, entry) {
5084 			err = got_object_id_str(&id_str, &qid->id);
5085 			if (err)
5086 				goto done;
5087 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
5088 			if (n < 0) {
5089 				err = got_error_from_errno("fprintf");
5090 				goto done;
5091 			}
5092 			outoff += n;
5093 			err = add_line_metadata(lines, nlines, outoff,
5094 			    GOT_DIFF_LINE_META);
5095 			if (err)
5096 				goto done;
5097 			free(id_str);
5098 			id_str = NULL;
5099 		}
5100 	}
5101 
5102 	err = got_object_commit_get_logmsg(&logmsg, commit);
5103 	if (err)
5104 		goto done;
5105 	s = logmsg;
5106 	while ((line = strsep(&s, "\n")) != NULL) {
5107 		n = fprintf(outfile, "%s\n", line);
5108 		if (n < 0) {
5109 			err = got_error_from_errno("fprintf");
5110 			goto done;
5111 		}
5112 		outoff += n;
5113 		err = add_line_metadata(lines, nlines, outoff,
5114 		    GOT_DIFF_LINE_LOGMSG);
5115 		if (err)
5116 			goto done;
5117 	}
5118 
5119 	TAILQ_FOREACH(pe, dsa->paths, entry) {
5120 		struct got_diff_changed_path *cp = pe->data;
5121 		int pad = dsa->max_path_len - pe->path_len + 1;
5122 
5123 		n = fprintf(outfile, "%c  %s%*c | %*d+ %*d-\n", cp->status,
5124 		    pe->path, pad, ' ', dsa->add_cols + 1, cp->add,
5125 		    dsa->rm_cols + 1, cp->rm);
5126 		if (n < 0) {
5127 			err = got_error_from_errno("fprintf");
5128 			goto done;
5129 		}
5130 		outoff += n;
5131 		err = add_line_metadata(lines, nlines, outoff,
5132 		    GOT_DIFF_LINE_CHANGES);
5133 		if (err)
5134 			goto done;
5135 	}
5136 
5137 	fputc('\n', outfile);
5138 	outoff++;
5139 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5140 	if (err)
5141 		goto done;
5142 
5143 	n = fprintf(outfile,
5144 	    "%d file%s changed, %d insertion%s(+), %d deletion%s(-)\n",
5145 	    dsa->nfiles, dsa->nfiles > 1 ? "s" : "", dsa->ins,
5146 	    dsa->ins != 1 ? "s" : "", dsa->del, dsa->del != 1 ? "s" : "");
5147 	if (n < 0) {
5148 		err = got_error_from_errno("fprintf");
5149 		goto done;
5150 	}
5151 	outoff += n;
5152 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5153 	if (err)
5154 		goto done;
5155 
5156 	fputc('\n', outfile);
5157 	outoff++;
5158 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
5159 done:
5160 	free(id_str);
5161 	free(logmsg);
5162 	free(refs_str);
5163 	got_object_commit_close(commit);
5164 	if (err) {
5165 		free(*lines);
5166 		*lines = NULL;
5167 		*nlines = 0;
5168 	}
5169 	return err;
5170 }
5171 
5172 static const struct got_error *
5173 create_diff(struct tog_diff_view_state *s)
5174 {
5175 	const struct got_error *err = NULL;
5176 	FILE *f = NULL, *tmp_diff_file = NULL;
5177 	int obj_type;
5178 	struct got_diff_line *lines = NULL;
5179 	struct got_pathlist_head changed_paths;
5180 
5181 	TAILQ_INIT(&changed_paths);
5182 
5183 	free(s->lines);
5184 	s->lines = malloc(sizeof(*s->lines));
5185 	if (s->lines == NULL)
5186 		return got_error_from_errno("malloc");
5187 	s->nlines = 0;
5188 
5189 	f = got_opentemp();
5190 	if (f == NULL) {
5191 		err = got_error_from_errno("got_opentemp");
5192 		goto done;
5193 	}
5194 	tmp_diff_file = got_opentemp();
5195 	if (tmp_diff_file == NULL) {
5196 		err = got_error_from_errno("got_opentemp");
5197 		goto done;
5198 	}
5199 	if (s->f && fclose(s->f) == EOF) {
5200 		err = got_error_from_errno("fclose");
5201 		goto done;
5202 	}
5203 	s->f = f;
5204 
5205 	if (s->id1)
5206 		err = got_object_get_type(&obj_type, s->repo, s->id1);
5207 	else
5208 		err = got_object_get_type(&obj_type, s->repo, s->id2);
5209 	if (err)
5210 		goto done;
5211 
5212 	switch (obj_type) {
5213 	case GOT_OBJ_TYPE_BLOB:
5214 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
5215 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
5216 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
5217 		    s->ignore_whitespace, s->force_text_diff, NULL, s->repo,
5218 		    s->f);
5219 		break;
5220 	case GOT_OBJ_TYPE_TREE:
5221 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
5222 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
5223 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5224 		    s->force_text_diff, NULL, s->repo, s->f);
5225 		break;
5226 	case GOT_OBJ_TYPE_COMMIT: {
5227 		const struct got_object_id_queue *parent_ids;
5228 		struct got_object_qid *pid;
5229 		struct got_commit_object *commit2;
5230 		struct got_reflist_head *refs;
5231 		size_t nlines = 0;
5232 		struct got_diffstat_cb_arg dsa = {
5233 			0, 0, 0, 0, 0, 0,
5234 			&changed_paths,
5235 			s->ignore_whitespace,
5236 			s->force_text_diff,
5237 			tog_diff_algo
5238 		};
5239 
5240 		lines = malloc(sizeof(*lines));
5241 		if (lines == NULL) {
5242 			err = got_error_from_errno("malloc");
5243 			goto done;
5244 		}
5245 
5246 		/* build diff first in tmp file then append to commit info */
5247 		err = got_diff_objects_as_commits(&lines, &nlines,
5248 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
5249 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
5250 		    s->force_text_diff, &dsa, s->repo, tmp_diff_file);
5251 		if (err)
5252 			break;
5253 
5254 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
5255 		if (err)
5256 			goto done;
5257 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
5258 		/* Show commit info if we're diffing to a parent/root commit. */
5259 		if (s->id1 == NULL) {
5260 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
5261 			    refs, s->repo, s->ignore_whitespace,
5262 			    s->force_text_diff, &dsa, s->f);
5263 			if (err)
5264 				goto done;
5265 		} else {
5266 			parent_ids = got_object_commit_get_parent_ids(commit2);
5267 			STAILQ_FOREACH(pid, parent_ids, entry) {
5268 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
5269 					err = write_commit_info(&s->lines,
5270 					    &s->nlines, s->id2, refs, s->repo,
5271 					    s->ignore_whitespace,
5272 					    s->force_text_diff, &dsa, s->f);
5273 					if (err)
5274 						goto done;
5275 					break;
5276 				}
5277 			}
5278 		}
5279 		got_object_commit_close(commit2);
5280 
5281 		err = cat_diff(s->f, tmp_diff_file, &s->lines, &s->nlines,
5282 		    lines, nlines);
5283 		break;
5284 	}
5285 	default:
5286 		err = got_error(GOT_ERR_OBJ_TYPE);
5287 		break;
5288 	}
5289 done:
5290 	free(lines);
5291 	got_pathlist_free(&changed_paths, GOT_PATHLIST_FREE_ALL);
5292 	if (s->f && fflush(s->f) != 0 && err == NULL)
5293 		err = got_error_from_errno("fflush");
5294 	if (tmp_diff_file && fclose(tmp_diff_file) == EOF && err == NULL)
5295 		err = got_error_from_errno("fclose");
5296 	return err;
5297 }
5298 
5299 static void
5300 diff_view_indicate_progress(struct tog_view *view)
5301 {
5302 	mvwaddstr(view->window, 0, 0, "diffing...");
5303 	update_panels();
5304 	doupdate();
5305 }
5306 
5307 static const struct got_error *
5308 search_start_diff_view(struct tog_view *view)
5309 {
5310 	struct tog_diff_view_state *s = &view->state.diff;
5311 
5312 	s->matched_line = 0;
5313 	return NULL;
5314 }
5315 
5316 static void
5317 search_setup_diff_view(struct tog_view *view, FILE **f, off_t **line_offsets,
5318     size_t *nlines, int **first, int **last, int **match, int **selected)
5319 {
5320 	struct tog_diff_view_state *s = &view->state.diff;
5321 
5322 	*f = s->f;
5323 	*nlines = s->nlines;
5324 	*line_offsets = NULL;
5325 	*match = &s->matched_line;
5326 	*first = &s->first_displayed_line;
5327 	*last = &s->last_displayed_line;
5328 	*selected = &s->selected_line;
5329 }
5330 
5331 static const struct got_error *
5332 search_next_view_match(struct tog_view *view)
5333 {
5334 	const struct got_error *err = NULL;
5335 	FILE *f;
5336 	int lineno;
5337 	char *line = NULL;
5338 	size_t linesize = 0;
5339 	ssize_t linelen;
5340 	off_t *line_offsets;
5341 	size_t nlines = 0;
5342 	int *first, *last, *match, *selected;
5343 
5344 	if (!view->search_setup)
5345 		return got_error_msg(GOT_ERR_NOT_IMPL,
5346 		    "view search not supported");
5347 	view->search_setup(view, &f, &line_offsets, &nlines, &first, &last,
5348 	    &match, &selected);
5349 
5350 	if (!view->searching) {
5351 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5352 		return NULL;
5353 	}
5354 
5355 	if (*match) {
5356 		if (view->searching == TOG_SEARCH_FORWARD)
5357 			lineno = *first + 1;
5358 		else
5359 			lineno = *first - 1;
5360 	} else
5361 		lineno = *first - 1 + *selected;
5362 
5363 	while (1) {
5364 		off_t offset;
5365 
5366 		if (lineno <= 0 || lineno > nlines) {
5367 			if (*match == 0) {
5368 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5369 				break;
5370 			}
5371 
5372 			if (view->searching == TOG_SEARCH_FORWARD)
5373 				lineno = 1;
5374 			else
5375 				lineno = nlines;
5376 		}
5377 
5378 		offset = view->type == TOG_VIEW_DIFF ?
5379 		    view->state.diff.lines[lineno - 1].offset :
5380 		    line_offsets[lineno - 1];
5381 		if (fseeko(f, offset, SEEK_SET) != 0) {
5382 			free(line);
5383 			return got_error_from_errno("fseeko");
5384 		}
5385 		linelen = getline(&line, &linesize, f);
5386 		if (linelen != -1) {
5387 			char *exstr;
5388 			err = expand_tab(&exstr, line);
5389 			if (err)
5390 				break;
5391 			if (match_line(exstr, &view->regex, 1,
5392 			    &view->regmatch)) {
5393 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5394 				*match = lineno;
5395 				free(exstr);
5396 				break;
5397 			}
5398 			free(exstr);
5399 		}
5400 		if (view->searching == TOG_SEARCH_FORWARD)
5401 			lineno++;
5402 		else
5403 			lineno--;
5404 	}
5405 	free(line);
5406 
5407 	if (*match) {
5408 		*first = *match;
5409 		*selected = 1;
5410 	}
5411 
5412 	return err;
5413 }
5414 
5415 static const struct got_error *
5416 close_diff_view(struct tog_view *view)
5417 {
5418 	const struct got_error *err = NULL;
5419 	struct tog_diff_view_state *s = &view->state.diff;
5420 
5421 	free(s->id1);
5422 	s->id1 = NULL;
5423 	free(s->id2);
5424 	s->id2 = NULL;
5425 	if (s->f && fclose(s->f) == EOF)
5426 		err = got_error_from_errno("fclose");
5427 	s->f = NULL;
5428 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
5429 		err = got_error_from_errno("fclose");
5430 	s->f1 = NULL;
5431 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
5432 		err = got_error_from_errno("fclose");
5433 	s->f2 = NULL;
5434 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
5435 		err = got_error_from_errno("close");
5436 	s->fd1 = -1;
5437 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
5438 		err = got_error_from_errno("close");
5439 	s->fd2 = -1;
5440 	free(s->lines);
5441 	s->lines = NULL;
5442 	s->nlines = 0;
5443 	return err;
5444 }
5445 
5446 static const struct got_error *
5447 open_diff_view(struct tog_view *view, struct got_object_id *id1,
5448     struct got_object_id *id2, const char *label1, const char *label2,
5449     int diff_context, int ignore_whitespace, int force_text_diff,
5450     struct tog_view *parent_view, struct got_repository *repo)
5451 {
5452 	const struct got_error *err;
5453 	struct tog_diff_view_state *s = &view->state.diff;
5454 
5455 	memset(s, 0, sizeof(*s));
5456 	s->fd1 = -1;
5457 	s->fd2 = -1;
5458 
5459 	if (id1 != NULL && id2 != NULL) {
5460 		int type1, type2;
5461 
5462 		err = got_object_get_type(&type1, repo, id1);
5463 		if (err)
5464 			goto done;
5465 		err = got_object_get_type(&type2, repo, id2);
5466 		if (err)
5467 			goto done;
5468 
5469 		if (type1 != type2) {
5470 			err = got_error(GOT_ERR_OBJ_TYPE);
5471 			goto done;
5472 		}
5473 	}
5474 	s->first_displayed_line = 1;
5475 	s->last_displayed_line = view->nlines;
5476 	s->selected_line = 1;
5477 	s->repo = repo;
5478 	s->id1 = id1;
5479 	s->id2 = id2;
5480 	s->label1 = label1;
5481 	s->label2 = label2;
5482 
5483 	if (id1) {
5484 		s->id1 = got_object_id_dup(id1);
5485 		if (s->id1 == NULL) {
5486 			err = got_error_from_errno("got_object_id_dup");
5487 			goto done;
5488 		}
5489 	} else
5490 		s->id1 = NULL;
5491 
5492 	s->id2 = got_object_id_dup(id2);
5493 	if (s->id2 == NULL) {
5494 		err = got_error_from_errno("got_object_id_dup");
5495 		goto done;
5496 	}
5497 
5498 	s->f1 = got_opentemp();
5499 	if (s->f1 == NULL) {
5500 		err = got_error_from_errno("got_opentemp");
5501 		goto done;
5502 	}
5503 
5504 	s->f2 = got_opentemp();
5505 	if (s->f2 == NULL) {
5506 		err = got_error_from_errno("got_opentemp");
5507 		goto done;
5508 	}
5509 
5510 	s->fd1 = got_opentempfd();
5511 	if (s->fd1 == -1) {
5512 		err = got_error_from_errno("got_opentempfd");
5513 		goto done;
5514 	}
5515 
5516 	s->fd2 = got_opentempfd();
5517 	if (s->fd2 == -1) {
5518 		err = got_error_from_errno("got_opentempfd");
5519 		goto done;
5520 	}
5521 
5522 	s->diff_context = diff_context;
5523 	s->ignore_whitespace = ignore_whitespace;
5524 	s->force_text_diff = force_text_diff;
5525 	s->parent_view = parent_view;
5526 	s->repo = repo;
5527 
5528 	if (has_colors() && getenv("TOG_COLORS") != NULL && !using_mock_io) {
5529 		int rc;
5530 
5531 		rc = init_pair(GOT_DIFF_LINE_MINUS,
5532 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
5533 		if (rc != ERR)
5534 			rc = init_pair(GOT_DIFF_LINE_PLUS,
5535 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
5536 		if (rc != ERR)
5537 			rc = init_pair(GOT_DIFF_LINE_HUNK,
5538 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
5539 		if (rc != ERR)
5540 			rc = init_pair(GOT_DIFF_LINE_META,
5541 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5542 		if (rc != ERR)
5543 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
5544 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5545 		if (rc != ERR)
5546 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
5547 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5548 		if (rc != ERR)
5549 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
5550 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
5551 		if (rc != ERR)
5552 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
5553 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
5554 		if (rc != ERR)
5555 			rc = init_pair(GOT_DIFF_LINE_DATE,
5556 			    get_color_value("TOG_COLOR_DATE"), -1);
5557 		if (rc == ERR) {
5558 			err = got_error(GOT_ERR_RANGE);
5559 			goto done;
5560 		}
5561 	}
5562 
5563 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
5564 	    view_is_splitscreen(view))
5565 		show_log_view(parent_view); /* draw border */
5566 	diff_view_indicate_progress(view);
5567 
5568 	err = create_diff(s);
5569 
5570 	view->show = show_diff_view;
5571 	view->input = input_diff_view;
5572 	view->reset = reset_diff_view;
5573 	view->close = close_diff_view;
5574 	view->search_start = search_start_diff_view;
5575 	view->search_setup = search_setup_diff_view;
5576 	view->search_next = search_next_view_match;
5577 done:
5578 	if (err) {
5579 		if (view->close == NULL)
5580 			close_diff_view(view);
5581 		view_close(view);
5582 	}
5583 	return err;
5584 }
5585 
5586 static const struct got_error *
5587 show_diff_view(struct tog_view *view)
5588 {
5589 	const struct got_error *err;
5590 	struct tog_diff_view_state *s = &view->state.diff;
5591 	char *id_str1 = NULL, *id_str2, *header;
5592 	const char *label1, *label2;
5593 
5594 	if (s->id1) {
5595 		err = got_object_id_str(&id_str1, s->id1);
5596 		if (err)
5597 			return err;
5598 		label1 = s->label1 ? s->label1 : id_str1;
5599 	} else
5600 		label1 = "/dev/null";
5601 
5602 	err = got_object_id_str(&id_str2, s->id2);
5603 	if (err)
5604 		return err;
5605 	label2 = s->label2 ? s->label2 : id_str2;
5606 
5607 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
5608 		err = got_error_from_errno("asprintf");
5609 		free(id_str1);
5610 		free(id_str2);
5611 		return err;
5612 	}
5613 	free(id_str1);
5614 	free(id_str2);
5615 
5616 	err = draw_file(view, header);
5617 	free(header);
5618 	return err;
5619 }
5620 
5621 static const struct got_error *
5622 set_selected_commit(struct tog_diff_view_state *s,
5623     struct commit_queue_entry *entry)
5624 {
5625 	const struct got_error *err;
5626 	const struct got_object_id_queue *parent_ids;
5627 	struct got_commit_object *selected_commit;
5628 	struct got_object_qid *pid;
5629 
5630 	free(s->id2);
5631 	s->id2 = got_object_id_dup(entry->id);
5632 	if (s->id2 == NULL)
5633 		return got_error_from_errno("got_object_id_dup");
5634 
5635 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
5636 	if (err)
5637 		return err;
5638 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
5639 	free(s->id1);
5640 	pid = STAILQ_FIRST(parent_ids);
5641 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
5642 	got_object_commit_close(selected_commit);
5643 	return NULL;
5644 }
5645 
5646 static const struct got_error *
5647 reset_diff_view(struct tog_view *view)
5648 {
5649 	struct tog_diff_view_state *s = &view->state.diff;
5650 
5651 	view->count = 0;
5652 	wclear(view->window);
5653 	s->first_displayed_line = 1;
5654 	s->last_displayed_line = view->nlines;
5655 	s->matched_line = 0;
5656 	diff_view_indicate_progress(view);
5657 	return create_diff(s);
5658 }
5659 
5660 static void
5661 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5662 {
5663 	int start, i;
5664 
5665 	i = start = s->first_displayed_line - 1;
5666 
5667 	while (s->lines[i].type != type) {
5668 		if (i == 0)
5669 			i = s->nlines - 1;
5670 		if (--i == start)
5671 			return; /* do nothing, requested type not in file */
5672 	}
5673 
5674 	s->selected_line = 1;
5675 	s->first_displayed_line = i;
5676 }
5677 
5678 static void
5679 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
5680 {
5681 	int start, i;
5682 
5683 	i = start = s->first_displayed_line + 1;
5684 
5685 	while (s->lines[i].type != type) {
5686 		if (i == s->nlines - 1)
5687 			i = 0;
5688 		if (++i == start)
5689 			return; /* do nothing, requested type not in file */
5690 	}
5691 
5692 	s->selected_line = 1;
5693 	s->first_displayed_line = i;
5694 }
5695 
5696 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5697     int, int, int);
5698 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5699     int, int);
5700 
5701 static const struct got_error *
5702 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5703 {
5704 	const struct got_error *err = NULL;
5705 	struct tog_diff_view_state *s = &view->state.diff;
5706 	struct tog_log_view_state *ls;
5707 	struct commit_queue_entry *old_selected_entry;
5708 	char *line = NULL;
5709 	size_t linesize = 0;
5710 	ssize_t linelen;
5711 	int i, nscroll = view->nlines - 1, up = 0;
5712 
5713 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5714 
5715 	switch (ch) {
5716 	case '0':
5717 	case '$':
5718 	case KEY_RIGHT:
5719 	case 'l':
5720 	case KEY_LEFT:
5721 	case 'h':
5722 		horizontal_scroll_input(view, ch);
5723 		break;
5724 	case 'a':
5725 	case 'w':
5726 		if (ch == 'a') {
5727 			s->force_text_diff = !s->force_text_diff;
5728 			view->action = s->force_text_diff ?
5729 			    "force ASCII text enabled" :
5730 			    "force ASCII text disabled";
5731 		}
5732 		else if (ch == 'w') {
5733 			s->ignore_whitespace = !s->ignore_whitespace;
5734 			view->action = s->ignore_whitespace ?
5735 			    "ignore whitespace enabled" :
5736 			    "ignore whitespace disabled";
5737 		}
5738 		err = reset_diff_view(view);
5739 		break;
5740 	case 'g':
5741 	case KEY_HOME:
5742 		s->first_displayed_line = 1;
5743 		view->count = 0;
5744 		break;
5745 	case 'G':
5746 	case KEY_END:
5747 		view->count = 0;
5748 		if (s->eof)
5749 			break;
5750 
5751 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5752 		s->eof = 1;
5753 		break;
5754 	case 'k':
5755 	case KEY_UP:
5756 	case CTRL('p'):
5757 		if (s->first_displayed_line > 1)
5758 			s->first_displayed_line--;
5759 		else
5760 			view->count = 0;
5761 		break;
5762 	case CTRL('u'):
5763 	case 'u':
5764 		nscroll /= 2;
5765 		/* FALL THROUGH */
5766 	case KEY_PPAGE:
5767 	case CTRL('b'):
5768 	case 'b':
5769 		if (s->first_displayed_line == 1) {
5770 			view->count = 0;
5771 			break;
5772 		}
5773 		i = 0;
5774 		while (i++ < nscroll && s->first_displayed_line > 1)
5775 			s->first_displayed_line--;
5776 		break;
5777 	case 'j':
5778 	case KEY_DOWN:
5779 	case CTRL('n'):
5780 		if (!s->eof)
5781 			s->first_displayed_line++;
5782 		else
5783 			view->count = 0;
5784 		break;
5785 	case CTRL('d'):
5786 	case 'd':
5787 		nscroll /= 2;
5788 		/* FALL THROUGH */
5789 	case KEY_NPAGE:
5790 	case CTRL('f'):
5791 	case 'f':
5792 	case ' ':
5793 		if (s->eof) {
5794 			view->count = 0;
5795 			break;
5796 		}
5797 		i = 0;
5798 		while (!s->eof && i++ < nscroll) {
5799 			linelen = getline(&line, &linesize, s->f);
5800 			s->first_displayed_line++;
5801 			if (linelen == -1) {
5802 				if (feof(s->f)) {
5803 					s->eof = 1;
5804 				} else
5805 					err = got_ferror(s->f, GOT_ERR_IO);
5806 				break;
5807 			}
5808 		}
5809 		free(line);
5810 		break;
5811 	case '(':
5812 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5813 		break;
5814 	case ')':
5815 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5816 		break;
5817 	case '{':
5818 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5819 		break;
5820 	case '}':
5821 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5822 		break;
5823 	case '[':
5824 		if (s->diff_context > 0) {
5825 			s->diff_context--;
5826 			s->matched_line = 0;
5827 			diff_view_indicate_progress(view);
5828 			err = create_diff(s);
5829 			if (s->first_displayed_line + view->nlines - 1 >
5830 			    s->nlines) {
5831 				s->first_displayed_line = 1;
5832 				s->last_displayed_line = view->nlines;
5833 			}
5834 		} else
5835 			view->count = 0;
5836 		break;
5837 	case ']':
5838 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5839 			s->diff_context++;
5840 			s->matched_line = 0;
5841 			diff_view_indicate_progress(view);
5842 			err = create_diff(s);
5843 		} else
5844 			view->count = 0;
5845 		break;
5846 	case '<':
5847 	case ',':
5848 	case 'K':
5849 		up = 1;
5850 		/* FALL THROUGH */
5851 	case '>':
5852 	case '.':
5853 	case 'J':
5854 		if (s->parent_view == NULL) {
5855 			view->count = 0;
5856 			break;
5857 		}
5858 		s->parent_view->count = view->count;
5859 
5860 		if (s->parent_view->type == TOG_VIEW_LOG) {
5861 			ls = &s->parent_view->state.log;
5862 			old_selected_entry = ls->selected_entry;
5863 
5864 			err = input_log_view(NULL, s->parent_view,
5865 			    up ? KEY_UP : KEY_DOWN);
5866 			if (err)
5867 				break;
5868 			view->count = s->parent_view->count;
5869 
5870 			if (old_selected_entry == ls->selected_entry)
5871 				break;
5872 
5873 			err = set_selected_commit(s, ls->selected_entry);
5874 			if (err)
5875 				break;
5876 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5877 			struct tog_blame_view_state *bs;
5878 			struct got_object_id *id, *prev_id;
5879 
5880 			bs = &s->parent_view->state.blame;
5881 			prev_id = get_annotation_for_line(bs->blame.lines,
5882 			    bs->blame.nlines, bs->last_diffed_line);
5883 
5884 			err = input_blame_view(&view, s->parent_view,
5885 			    up ? KEY_UP : KEY_DOWN);
5886 			if (err)
5887 				break;
5888 			view->count = s->parent_view->count;
5889 
5890 			if (prev_id == NULL)
5891 				break;
5892 			id = get_selected_commit_id(bs->blame.lines,
5893 			    bs->blame.nlines, bs->first_displayed_line,
5894 			    bs->selected_line);
5895 			if (id == NULL)
5896 				break;
5897 
5898 			if (!got_object_id_cmp(prev_id, id))
5899 				break;
5900 
5901 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5902 			if (err)
5903 				break;
5904 		}
5905 		s->first_displayed_line = 1;
5906 		s->last_displayed_line = view->nlines;
5907 		s->matched_line = 0;
5908 		view->x = 0;
5909 
5910 		diff_view_indicate_progress(view);
5911 		err = create_diff(s);
5912 		break;
5913 	default:
5914 		view->count = 0;
5915 		break;
5916 	}
5917 
5918 	return err;
5919 }
5920 
5921 static const struct got_error *
5922 cmd_diff(int argc, char *argv[])
5923 {
5924 	const struct got_error *error;
5925 	struct got_repository *repo = NULL;
5926 	struct got_worktree *worktree = NULL;
5927 	struct got_object_id *id1 = NULL, *id2 = NULL;
5928 	char *repo_path = NULL, *cwd = NULL;
5929 	char *id_str1 = NULL, *id_str2 = NULL;
5930 	char *keyword_idstr1 = NULL, *keyword_idstr2 = NULL;
5931 	char *label1 = NULL, *label2 = NULL;
5932 	int diff_context = 3, ignore_whitespace = 0;
5933 	int ch, force_text_diff = 0;
5934 	const char *errstr;
5935 	struct tog_view *view;
5936 	int *pack_fds = NULL;
5937 
5938 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5939 		switch (ch) {
5940 		case 'a':
5941 			force_text_diff = 1;
5942 			break;
5943 		case 'C':
5944 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5945 			    &errstr);
5946 			if (errstr != NULL)
5947 				errx(1, "number of context lines is %s: %s",
5948 				    errstr, errstr);
5949 			break;
5950 		case 'r':
5951 			repo_path = realpath(optarg, NULL);
5952 			if (repo_path == NULL)
5953 				return got_error_from_errno2("realpath",
5954 				    optarg);
5955 			got_path_strip_trailing_slashes(repo_path);
5956 			break;
5957 		case 'w':
5958 			ignore_whitespace = 1;
5959 			break;
5960 		default:
5961 			usage_diff();
5962 			/* NOTREACHED */
5963 		}
5964 	}
5965 
5966 	argc -= optind;
5967 	argv += optind;
5968 
5969 	if (argc == 0) {
5970 		usage_diff(); /* TODO show local worktree changes */
5971 	} else if (argc == 2) {
5972 		id_str1 = argv[0];
5973 		id_str2 = argv[1];
5974 	} else
5975 		usage_diff();
5976 
5977 	error = got_repo_pack_fds_open(&pack_fds);
5978 	if (error)
5979 		goto done;
5980 
5981 	if (repo_path == NULL) {
5982 		cwd = getcwd(NULL, 0);
5983 		if (cwd == NULL)
5984 			return got_error_from_errno("getcwd");
5985 		error = got_worktree_open(&worktree, cwd, NULL);
5986 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5987 			goto done;
5988 		if (worktree)
5989 			repo_path =
5990 			    strdup(got_worktree_get_repo_path(worktree));
5991 		else
5992 			repo_path = strdup(cwd);
5993 		if (repo_path == NULL) {
5994 			error = got_error_from_errno("strdup");
5995 			goto done;
5996 		}
5997 	}
5998 
5999 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6000 	if (error)
6001 		goto done;
6002 
6003 	init_curses();
6004 
6005 	error = apply_unveil(got_repo_get_path(repo), NULL);
6006 	if (error)
6007 		goto done;
6008 
6009 	error = tog_load_refs(repo, 0);
6010 	if (error)
6011 		goto done;
6012 
6013 	if (id_str1 != NULL) {
6014 		error = got_keyword_to_idstr(&keyword_idstr1, id_str1,
6015 		    repo, worktree);
6016 		if (error != NULL)
6017 			goto done;
6018 		if (keyword_idstr1 != NULL)
6019 			id_str1 = keyword_idstr1;
6020 	}
6021 	if (id_str2 != NULL) {
6022 		error = got_keyword_to_idstr(&keyword_idstr2, id_str2,
6023 		    repo, worktree);
6024 		if (error != NULL)
6025 			goto done;
6026 		if (keyword_idstr2 != NULL)
6027 			id_str2 = keyword_idstr2;
6028 	}
6029 
6030 	error = got_repo_match_object_id(&id1, &label1, id_str1,
6031 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6032 	if (error)
6033 		goto done;
6034 
6035 	error = got_repo_match_object_id(&id2, &label2, id_str2,
6036 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
6037 	if (error)
6038 		goto done;
6039 
6040 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
6041 	if (view == NULL) {
6042 		error = got_error_from_errno("view_open");
6043 		goto done;
6044 	}
6045 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
6046 	    ignore_whitespace, force_text_diff, NULL,  repo);
6047 	if (error)
6048 		goto done;
6049 	error = view_loop(view);
6050 done:
6051 	free(keyword_idstr1);
6052 	free(keyword_idstr2);
6053 	free(label1);
6054 	free(label2);
6055 	free(repo_path);
6056 	free(cwd);
6057 	if (repo) {
6058 		const struct got_error *close_err = got_repo_close(repo);
6059 		if (error == NULL)
6060 			error = close_err;
6061 	}
6062 	if (worktree)
6063 		got_worktree_close(worktree);
6064 	if (pack_fds) {
6065 		const struct got_error *pack_err =
6066 		    got_repo_pack_fds_close(pack_fds);
6067 		if (error == NULL)
6068 			error = pack_err;
6069 	}
6070 	tog_free_refs();
6071 	return error;
6072 }
6073 
6074 __dead static void
6075 usage_blame(void)
6076 {
6077 	endwin();
6078 	fprintf(stderr,
6079 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
6080 	    getprogname());
6081 	exit(1);
6082 }
6083 
6084 struct tog_blame_line {
6085 	int annotated;
6086 	struct got_object_id *id;
6087 };
6088 
6089 static const struct got_error *
6090 draw_blame(struct tog_view *view)
6091 {
6092 	struct tog_blame_view_state *s = &view->state.blame;
6093 	struct tog_blame *blame = &s->blame;
6094 	regmatch_t *regmatch = &view->regmatch;
6095 	const struct got_error *err;
6096 	int lineno = 0, nprinted = 0;
6097 	char *line = NULL;
6098 	size_t linesize = 0;
6099 	ssize_t linelen;
6100 	wchar_t *wline;
6101 	int width;
6102 	struct tog_blame_line *blame_line;
6103 	struct got_object_id *prev_id = NULL;
6104 	char *id_str;
6105 	struct tog_color *tc;
6106 
6107 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
6108 	if (err)
6109 		return err;
6110 
6111 	rewind(blame->f);
6112 	werase(view->window);
6113 
6114 	if (asprintf(&line, "commit %s", id_str) == -1) {
6115 		err = got_error_from_errno("asprintf");
6116 		free(id_str);
6117 		return err;
6118 	}
6119 
6120 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6121 	free(line);
6122 	line = NULL;
6123 	if (err)
6124 		return err;
6125 	if (view_needs_focus_indication(view))
6126 		wstandout(view->window);
6127 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6128 	if (tc)
6129 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6130 	waddwstr(view->window, wline);
6131 	while (width++ < view->ncols)
6132 		waddch(view->window, ' ');
6133 	if (tc)
6134 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6135 	if (view_needs_focus_indication(view))
6136 		wstandend(view->window);
6137 	free(wline);
6138 	wline = NULL;
6139 
6140 	if (view->gline > blame->nlines)
6141 		view->gline = blame->nlines;
6142 
6143 	if (tog_io.wait_for_ui) {
6144 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6145 		int rc;
6146 
6147 		rc = pthread_cond_wait(&bta->blame_complete, &tog_mutex);
6148 		if (rc)
6149 			return got_error_set_errno(rc, "pthread_cond_wait");
6150 		tog_io.wait_for_ui = 0;
6151 	}
6152 
6153 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
6154 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
6155 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
6156 		free(id_str);
6157 		return got_error_from_errno("asprintf");
6158 	}
6159 	free(id_str);
6160 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
6161 	free(line);
6162 	line = NULL;
6163 	if (err)
6164 		return err;
6165 	waddwstr(view->window, wline);
6166 	free(wline);
6167 	wline = NULL;
6168 	if (width < view->ncols - 1)
6169 		waddch(view->window, '\n');
6170 
6171 	s->eof = 0;
6172 	view->maxx = 0;
6173 	while (nprinted < view->nlines - 2) {
6174 		linelen = getline(&line, &linesize, blame->f);
6175 		if (linelen == -1) {
6176 			if (feof(blame->f)) {
6177 				s->eof = 1;
6178 				break;
6179 			}
6180 			free(line);
6181 			return got_ferror(blame->f, GOT_ERR_IO);
6182 		}
6183 		if (++lineno < s->first_displayed_line)
6184 			continue;
6185 		if (view->gline && !gotoline(view, &lineno, &nprinted))
6186 			continue;
6187 
6188 		/* Set view->maxx based on full line length. */
6189 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
6190 		if (err) {
6191 			free(line);
6192 			return err;
6193 		}
6194 		free(wline);
6195 		wline = NULL;
6196 		view->maxx = MAX(view->maxx, width);
6197 
6198 		if (nprinted == s->selected_line - 1)
6199 			wstandout(view->window);
6200 
6201 		if (blame->nlines > 0) {
6202 			blame_line = &blame->lines[lineno - 1];
6203 			if (blame_line->annotated && prev_id &&
6204 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
6205 			    !(nprinted == s->selected_line - 1)) {
6206 				waddstr(view->window, "        ");
6207 			} else if (blame_line->annotated) {
6208 				char *id_str;
6209 				err = got_object_id_str(&id_str,
6210 				    blame_line->id);
6211 				if (err) {
6212 					free(line);
6213 					return err;
6214 				}
6215 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6216 				if (tc)
6217 					wattr_on(view->window,
6218 					    COLOR_PAIR(tc->colorpair), NULL);
6219 				wprintw(view->window, "%.8s", id_str);
6220 				if (tc)
6221 					wattr_off(view->window,
6222 					    COLOR_PAIR(tc->colorpair), NULL);
6223 				free(id_str);
6224 				prev_id = blame_line->id;
6225 			} else {
6226 				waddstr(view->window, "........");
6227 				prev_id = NULL;
6228 			}
6229 		} else {
6230 			waddstr(view->window, "........");
6231 			prev_id = NULL;
6232 		}
6233 
6234 		if (nprinted == s->selected_line - 1)
6235 			wstandend(view->window);
6236 		waddstr(view->window, " ");
6237 
6238 		if (view->ncols <= 9) {
6239 			width = 9;
6240 		} else if (s->first_displayed_line + nprinted ==
6241 		    s->matched_line &&
6242 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
6243 			err = add_matched_line(&width, line, view->ncols - 9, 9,
6244 			    view->window, view->x, regmatch);
6245 			if (err) {
6246 				free(line);
6247 				return err;
6248 			}
6249 			width += 9;
6250 		} else {
6251 			int skip;
6252 			err = format_line(&wline, &width, &skip, line,
6253 			    view->x, view->ncols - 9, 9, 1);
6254 			if (err) {
6255 				free(line);
6256 				return err;
6257 			}
6258 			waddwstr(view->window, &wline[skip]);
6259 			width += 9;
6260 			free(wline);
6261 			wline = NULL;
6262 		}
6263 
6264 		if (width <= view->ncols - 1)
6265 			waddch(view->window, '\n');
6266 		if (++nprinted == 1)
6267 			s->first_displayed_line = lineno;
6268 	}
6269 	free(line);
6270 	s->last_displayed_line = lineno;
6271 
6272 	view_border(view);
6273 
6274 	return NULL;
6275 }
6276 
6277 static const struct got_error *
6278 blame_cb(void *arg, int nlines, int lineno,
6279     struct got_commit_object *commit, struct got_object_id *id)
6280 {
6281 	const struct got_error *err = NULL;
6282 	struct tog_blame_cb_args *a = arg;
6283 	struct tog_blame_line *line;
6284 	int errcode;
6285 
6286 	if (nlines != a->nlines ||
6287 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
6288 		return got_error(GOT_ERR_RANGE);
6289 
6290 	errcode = pthread_mutex_lock(&tog_mutex);
6291 	if (errcode)
6292 		return got_error_set_errno(errcode, "pthread_mutex_lock");
6293 
6294 	if (*a->quit) {	/* user has quit the blame view */
6295 		err = got_error(GOT_ERR_ITER_COMPLETED);
6296 		goto done;
6297 	}
6298 
6299 	if (lineno == -1)
6300 		goto done; /* no change in this commit */
6301 
6302 	line = &a->lines[lineno - 1];
6303 	if (line->annotated)
6304 		goto done;
6305 
6306 	line->id = got_object_id_dup(id);
6307 	if (line->id == NULL) {
6308 		err = got_error_from_errno("got_object_id_dup");
6309 		goto done;
6310 	}
6311 	line->annotated = 1;
6312 done:
6313 	errcode = pthread_mutex_unlock(&tog_mutex);
6314 	if (errcode)
6315 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6316 	return err;
6317 }
6318 
6319 static void *
6320 blame_thread(void *arg)
6321 {
6322 	const struct got_error *err, *close_err;
6323 	struct tog_blame_thread_args *ta = arg;
6324 	struct tog_blame_cb_args *a = ta->cb_args;
6325 	int errcode, fd1 = -1, fd2 = -1;
6326 	FILE *f1 = NULL, *f2 = NULL;
6327 
6328 	fd1 = got_opentempfd();
6329 	if (fd1 == -1)
6330 		return (void *)got_error_from_errno("got_opentempfd");
6331 
6332 	fd2 = got_opentempfd();
6333 	if (fd2 == -1) {
6334 		err = got_error_from_errno("got_opentempfd");
6335 		goto done;
6336 	}
6337 
6338 	f1 = got_opentemp();
6339 	if (f1 == NULL) {
6340 		err = (void *)got_error_from_errno("got_opentemp");
6341 		goto done;
6342 	}
6343 	f2 = got_opentemp();
6344 	if (f2 == NULL) {
6345 		err = (void *)got_error_from_errno("got_opentemp");
6346 		goto done;
6347 	}
6348 
6349 	err = block_signals_used_by_main_thread();
6350 	if (err)
6351 		goto done;
6352 
6353 	err = got_blame(ta->path, a->commit_id, ta->repo,
6354 	    tog_diff_algo, blame_cb, ta->cb_args,
6355 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
6356 	if (err && err->code == GOT_ERR_CANCELLED)
6357 		err = NULL;
6358 
6359 	errcode = pthread_mutex_lock(&tog_mutex);
6360 	if (errcode) {
6361 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
6362 		goto done;
6363 	}
6364 
6365 	close_err = got_repo_close(ta->repo);
6366 	if (err == NULL)
6367 		err = close_err;
6368 	ta->repo = NULL;
6369 	*ta->complete = 1;
6370 
6371 	if (tog_io.wait_for_ui) {
6372 		errcode = pthread_cond_signal(&ta->blame_complete);
6373 		if (errcode && err == NULL)
6374 			err = got_error_set_errno(errcode,
6375 			    "pthread_cond_signal");
6376 	}
6377 
6378 	errcode = pthread_mutex_unlock(&tog_mutex);
6379 	if (errcode && err == NULL)
6380 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
6381 
6382 done:
6383 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
6384 		err = got_error_from_errno("close");
6385 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
6386 		err = got_error_from_errno("close");
6387 	if (f1 && fclose(f1) == EOF && err == NULL)
6388 		err = got_error_from_errno("fclose");
6389 	if (f2 && fclose(f2) == EOF && err == NULL)
6390 		err = got_error_from_errno("fclose");
6391 
6392 	return (void *)err;
6393 }
6394 
6395 static struct got_object_id *
6396 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
6397     int first_displayed_line, int selected_line)
6398 {
6399 	struct tog_blame_line *line;
6400 
6401 	if (nlines <= 0)
6402 		return NULL;
6403 
6404 	line = &lines[first_displayed_line - 1 + selected_line - 1];
6405 	if (!line->annotated)
6406 		return NULL;
6407 
6408 	return line->id;
6409 }
6410 
6411 static struct got_object_id *
6412 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
6413     int lineno)
6414 {
6415 	struct tog_blame_line *line;
6416 
6417 	if (nlines <= 0 || lineno >= nlines)
6418 		return NULL;
6419 
6420 	line = &lines[lineno - 1];
6421 	if (!line->annotated)
6422 		return NULL;
6423 
6424 	return line->id;
6425 }
6426 
6427 static const struct got_error *
6428 stop_blame(struct tog_blame *blame)
6429 {
6430 	const struct got_error *err = NULL;
6431 	int i;
6432 
6433 	if (blame->thread) {
6434 		int errcode;
6435 		errcode = pthread_mutex_unlock(&tog_mutex);
6436 		if (errcode)
6437 			return got_error_set_errno(errcode,
6438 			    "pthread_mutex_unlock");
6439 		errcode = pthread_join(blame->thread, (void **)&err);
6440 		if (errcode)
6441 			return got_error_set_errno(errcode, "pthread_join");
6442 		errcode = pthread_mutex_lock(&tog_mutex);
6443 		if (errcode)
6444 			return got_error_set_errno(errcode,
6445 			    "pthread_mutex_lock");
6446 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
6447 			err = NULL;
6448 		blame->thread = NULL;
6449 	}
6450 	if (blame->thread_args.repo) {
6451 		const struct got_error *close_err;
6452 		close_err = got_repo_close(blame->thread_args.repo);
6453 		if (err == NULL)
6454 			err = close_err;
6455 		blame->thread_args.repo = NULL;
6456 	}
6457 	if (blame->f) {
6458 		if (fclose(blame->f) == EOF && err == NULL)
6459 			err = got_error_from_errno("fclose");
6460 		blame->f = NULL;
6461 	}
6462 	if (blame->lines) {
6463 		for (i = 0; i < blame->nlines; i++)
6464 			free(blame->lines[i].id);
6465 		free(blame->lines);
6466 		blame->lines = NULL;
6467 	}
6468 	free(blame->cb_args.commit_id);
6469 	blame->cb_args.commit_id = NULL;
6470 	if (blame->pack_fds) {
6471 		const struct got_error *pack_err =
6472 		    got_repo_pack_fds_close(blame->pack_fds);
6473 		if (err == NULL)
6474 			err = pack_err;
6475 		blame->pack_fds = NULL;
6476 	}
6477 	return err;
6478 }
6479 
6480 static const struct got_error *
6481 cancel_blame_view(void *arg)
6482 {
6483 	const struct got_error *err = NULL;
6484 	int *done = arg;
6485 	int errcode;
6486 
6487 	errcode = pthread_mutex_lock(&tog_mutex);
6488 	if (errcode)
6489 		return got_error_set_errno(errcode,
6490 		    "pthread_mutex_unlock");
6491 
6492 	if (*done)
6493 		err = got_error(GOT_ERR_CANCELLED);
6494 
6495 	errcode = pthread_mutex_unlock(&tog_mutex);
6496 	if (errcode)
6497 		return got_error_set_errno(errcode,
6498 		    "pthread_mutex_lock");
6499 
6500 	return err;
6501 }
6502 
6503 static const struct got_error *
6504 run_blame(struct tog_view *view)
6505 {
6506 	struct tog_blame_view_state *s = &view->state.blame;
6507 	struct tog_blame *blame = &s->blame;
6508 	const struct got_error *err = NULL;
6509 	struct got_commit_object *commit = NULL;
6510 	struct got_blob_object *blob = NULL;
6511 	struct got_repository *thread_repo = NULL;
6512 	struct got_object_id *obj_id = NULL;
6513 	int obj_type, fd = -1;
6514 	int *pack_fds = NULL;
6515 
6516 	err = got_object_open_as_commit(&commit, s->repo,
6517 	    &s->blamed_commit->id);
6518 	if (err)
6519 		return err;
6520 
6521 	fd = got_opentempfd();
6522 	if (fd == -1) {
6523 		err = got_error_from_errno("got_opentempfd");
6524 		goto done;
6525 	}
6526 
6527 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
6528 	if (err)
6529 		goto done;
6530 
6531 	err = got_object_get_type(&obj_type, s->repo, obj_id);
6532 	if (err)
6533 		goto done;
6534 
6535 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
6536 		err = got_error(GOT_ERR_OBJ_TYPE);
6537 		goto done;
6538 	}
6539 
6540 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
6541 	if (err)
6542 		goto done;
6543 	blame->f = got_opentemp();
6544 	if (blame->f == NULL) {
6545 		err = got_error_from_errno("got_opentemp");
6546 		goto done;
6547 	}
6548 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
6549 	    &blame->line_offsets, blame->f, blob);
6550 	if (err)
6551 		goto done;
6552 	if (blame->nlines == 0) {
6553 		s->blame_complete = 1;
6554 		goto done;
6555 	}
6556 
6557 	/* Don't include \n at EOF in the blame line count. */
6558 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
6559 		blame->nlines--;
6560 
6561 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
6562 	if (blame->lines == NULL) {
6563 		err = got_error_from_errno("calloc");
6564 		goto done;
6565 	}
6566 
6567 	err = got_repo_pack_fds_open(&pack_fds);
6568 	if (err)
6569 		goto done;
6570 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
6571 	    pack_fds);
6572 	if (err)
6573 		goto done;
6574 
6575 	blame->pack_fds = pack_fds;
6576 	blame->cb_args.view = view;
6577 	blame->cb_args.lines = blame->lines;
6578 	blame->cb_args.nlines = blame->nlines;
6579 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
6580 	if (blame->cb_args.commit_id == NULL) {
6581 		err = got_error_from_errno("got_object_id_dup");
6582 		goto done;
6583 	}
6584 	blame->cb_args.quit = &s->done;
6585 
6586 	blame->thread_args.path = s->path;
6587 	blame->thread_args.repo = thread_repo;
6588 	blame->thread_args.cb_args = &blame->cb_args;
6589 	blame->thread_args.complete = &s->blame_complete;
6590 	blame->thread_args.cancel_cb = cancel_blame_view;
6591 	blame->thread_args.cancel_arg = &s->done;
6592 	s->blame_complete = 0;
6593 
6594 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
6595 		s->first_displayed_line = 1;
6596 		s->last_displayed_line = view->nlines;
6597 		s->selected_line = 1;
6598 	}
6599 	s->matched_line = 0;
6600 
6601 done:
6602 	if (commit)
6603 		got_object_commit_close(commit);
6604 	if (fd != -1 && close(fd) == -1 && err == NULL)
6605 		err = got_error_from_errno("close");
6606 	if (blob)
6607 		got_object_blob_close(blob);
6608 	free(obj_id);
6609 	if (err)
6610 		stop_blame(blame);
6611 	return err;
6612 }
6613 
6614 static const struct got_error *
6615 open_blame_view(struct tog_view *view, char *path,
6616     struct got_object_id *commit_id, struct got_repository *repo)
6617 {
6618 	const struct got_error *err = NULL;
6619 	struct tog_blame_view_state *s = &view->state.blame;
6620 
6621 	STAILQ_INIT(&s->blamed_commits);
6622 
6623 	s->path = strdup(path);
6624 	if (s->path == NULL)
6625 		return got_error_from_errno("strdup");
6626 
6627 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
6628 	if (err) {
6629 		free(s->path);
6630 		return err;
6631 	}
6632 
6633 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
6634 	s->first_displayed_line = 1;
6635 	s->last_displayed_line = view->nlines;
6636 	s->selected_line = 1;
6637 	s->blame_complete = 0;
6638 	s->repo = repo;
6639 	s->commit_id = commit_id;
6640 	memset(&s->blame, 0, sizeof(s->blame));
6641 
6642 	STAILQ_INIT(&s->colors);
6643 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6644 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
6645 		    get_color_value("TOG_COLOR_COMMIT"));
6646 		if (err)
6647 			return err;
6648 	}
6649 
6650 	view->show = show_blame_view;
6651 	view->input = input_blame_view;
6652 	view->reset = reset_blame_view;
6653 	view->close = close_blame_view;
6654 	view->search_start = search_start_blame_view;
6655 	view->search_setup = search_setup_blame_view;
6656 	view->search_next = search_next_view_match;
6657 
6658 	if (using_mock_io) {
6659 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6660 		int rc;
6661 
6662 		rc = pthread_cond_init(&bta->blame_complete, NULL);
6663 		if (rc)
6664 			return got_error_set_errno(rc, "pthread_cond_init");
6665 	}
6666 
6667 	return run_blame(view);
6668 }
6669 
6670 static const struct got_error *
6671 close_blame_view(struct tog_view *view)
6672 {
6673 	const struct got_error *err = NULL;
6674 	struct tog_blame_view_state *s = &view->state.blame;
6675 
6676 	if (s->blame.thread)
6677 		err = stop_blame(&s->blame);
6678 
6679 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
6680 		struct got_object_qid *blamed_commit;
6681 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
6682 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6683 		got_object_qid_free(blamed_commit);
6684 	}
6685 
6686 	if (using_mock_io) {
6687 		struct tog_blame_thread_args *bta = &s->blame.thread_args;
6688 		int rc;
6689 
6690 		rc = pthread_cond_destroy(&bta->blame_complete);
6691 		if (rc && err == NULL)
6692 			err = got_error_set_errno(rc, "pthread_cond_destroy");
6693 	}
6694 
6695 	free(s->path);
6696 	free_colors(&s->colors);
6697 	return err;
6698 }
6699 
6700 static const struct got_error *
6701 search_start_blame_view(struct tog_view *view)
6702 {
6703 	struct tog_blame_view_state *s = &view->state.blame;
6704 
6705 	s->matched_line = 0;
6706 	return NULL;
6707 }
6708 
6709 static void
6710 search_setup_blame_view(struct tog_view *view, FILE **f, off_t **line_offsets,
6711     size_t *nlines, int **first, int **last, int **match, int **selected)
6712 {
6713 	struct tog_blame_view_state *s = &view->state.blame;
6714 
6715 	*f = s->blame.f;
6716 	*nlines = s->blame.nlines;
6717 	*line_offsets = s->blame.line_offsets;
6718 	*match = &s->matched_line;
6719 	*first = &s->first_displayed_line;
6720 	*last = &s->last_displayed_line;
6721 	*selected = &s->selected_line;
6722 }
6723 
6724 static const struct got_error *
6725 show_blame_view(struct tog_view *view)
6726 {
6727 	const struct got_error *err = NULL;
6728 	struct tog_blame_view_state *s = &view->state.blame;
6729 	int errcode;
6730 
6731 	if (s->blame.thread == NULL && !s->blame_complete) {
6732 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6733 		    &s->blame.thread_args);
6734 		if (errcode)
6735 			return got_error_set_errno(errcode, "pthread_create");
6736 
6737 		if (!using_mock_io)
6738 			halfdelay(1); /* fast refresh while annotating  */
6739 	}
6740 
6741 	if (s->blame_complete && !using_mock_io)
6742 		halfdelay(10); /* disable fast refresh */
6743 
6744 	err = draw_blame(view);
6745 
6746 	view_border(view);
6747 	return err;
6748 }
6749 
6750 static const struct got_error *
6751 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6752     struct got_repository *repo, struct got_object_id *id)
6753 {
6754 	struct tog_view		*log_view;
6755 	const struct got_error	*err = NULL;
6756 
6757 	*new_view = NULL;
6758 
6759 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6760 	if (log_view == NULL)
6761 		return got_error_from_errno("view_open");
6762 
6763 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6764 	if (err)
6765 		view_close(log_view);
6766 	else
6767 		*new_view = log_view;
6768 
6769 	return err;
6770 }
6771 
6772 static const struct got_error *
6773 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6774 {
6775 	const struct got_error *err = NULL, *thread_err = NULL;
6776 	struct tog_view *diff_view;
6777 	struct tog_blame_view_state *s = &view->state.blame;
6778 	int eos, nscroll, begin_y = 0, begin_x = 0;
6779 
6780 	eos = nscroll = view->nlines - 2;
6781 	if (view_is_hsplit_top(view))
6782 		--eos;  /* border */
6783 
6784 	switch (ch) {
6785 	case '0':
6786 	case '$':
6787 	case KEY_RIGHT:
6788 	case 'l':
6789 	case KEY_LEFT:
6790 	case 'h':
6791 		horizontal_scroll_input(view, ch);
6792 		break;
6793 	case 'q':
6794 		s->done = 1;
6795 		break;
6796 	case 'g':
6797 	case KEY_HOME:
6798 		s->selected_line = 1;
6799 		s->first_displayed_line = 1;
6800 		view->count = 0;
6801 		break;
6802 	case 'G':
6803 	case KEY_END:
6804 		if (s->blame.nlines < eos) {
6805 			s->selected_line = s->blame.nlines;
6806 			s->first_displayed_line = 1;
6807 		} else {
6808 			s->selected_line = eos;
6809 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6810 		}
6811 		view->count = 0;
6812 		break;
6813 	case 'k':
6814 	case KEY_UP:
6815 	case CTRL('p'):
6816 		if (s->selected_line > 1)
6817 			s->selected_line--;
6818 		else if (s->selected_line == 1 &&
6819 		    s->first_displayed_line > 1)
6820 			s->first_displayed_line--;
6821 		else
6822 			view->count = 0;
6823 		break;
6824 	case CTRL('u'):
6825 	case 'u':
6826 		nscroll /= 2;
6827 		/* FALL THROUGH */
6828 	case KEY_PPAGE:
6829 	case CTRL('b'):
6830 	case 'b':
6831 		if (s->first_displayed_line == 1) {
6832 			if (view->count > 1)
6833 				nscroll += nscroll;
6834 			s->selected_line = MAX(1, s->selected_line - nscroll);
6835 			view->count = 0;
6836 			break;
6837 		}
6838 		if (s->first_displayed_line > nscroll)
6839 			s->first_displayed_line -= nscroll;
6840 		else
6841 			s->first_displayed_line = 1;
6842 		break;
6843 	case 'j':
6844 	case KEY_DOWN:
6845 	case CTRL('n'):
6846 		if (s->selected_line < eos && s->first_displayed_line +
6847 		    s->selected_line <= s->blame.nlines)
6848 			s->selected_line++;
6849 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6850 			s->first_displayed_line++;
6851 		else
6852 			view->count = 0;
6853 		break;
6854 	case 'c':
6855 	case 'p': {
6856 		struct got_object_id *id = NULL;
6857 
6858 		view->count = 0;
6859 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6860 		    s->first_displayed_line, s->selected_line);
6861 		if (id == NULL)
6862 			break;
6863 		if (ch == 'p') {
6864 			struct got_commit_object *commit, *pcommit;
6865 			struct got_object_qid *pid;
6866 			struct got_object_id *blob_id = NULL;
6867 			int obj_type;
6868 			err = got_object_open_as_commit(&commit,
6869 			    s->repo, id);
6870 			if (err)
6871 				break;
6872 			pid = STAILQ_FIRST(
6873 			    got_object_commit_get_parent_ids(commit));
6874 			if (pid == NULL) {
6875 				got_object_commit_close(commit);
6876 				break;
6877 			}
6878 			/* Check if path history ends here. */
6879 			err = got_object_open_as_commit(&pcommit,
6880 			    s->repo, &pid->id);
6881 			if (err)
6882 				break;
6883 			err = got_object_id_by_path(&blob_id, s->repo,
6884 			    pcommit, s->path);
6885 			got_object_commit_close(pcommit);
6886 			if (err) {
6887 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6888 					err = NULL;
6889 				got_object_commit_close(commit);
6890 				break;
6891 			}
6892 			err = got_object_get_type(&obj_type, s->repo,
6893 			    blob_id);
6894 			free(blob_id);
6895 			/* Can't blame non-blob type objects. */
6896 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6897 				got_object_commit_close(commit);
6898 				break;
6899 			}
6900 			err = got_object_qid_alloc(&s->blamed_commit,
6901 			    &pid->id);
6902 			got_object_commit_close(commit);
6903 		} else {
6904 			if (got_object_id_cmp(id,
6905 			    &s->blamed_commit->id) == 0)
6906 				break;
6907 			err = got_object_qid_alloc(&s->blamed_commit,
6908 			    id);
6909 		}
6910 		if (err)
6911 			break;
6912 		s->done = 1;
6913 		thread_err = stop_blame(&s->blame);
6914 		s->done = 0;
6915 		if (thread_err)
6916 			break;
6917 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6918 		    s->blamed_commit, entry);
6919 		err = run_blame(view);
6920 		if (err)
6921 			break;
6922 		break;
6923 	}
6924 	case 'C': {
6925 		struct got_object_qid *first;
6926 
6927 		view->count = 0;
6928 		first = STAILQ_FIRST(&s->blamed_commits);
6929 		if (!got_object_id_cmp(&first->id, s->commit_id))
6930 			break;
6931 		s->done = 1;
6932 		thread_err = stop_blame(&s->blame);
6933 		s->done = 0;
6934 		if (thread_err)
6935 			break;
6936 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6937 		got_object_qid_free(s->blamed_commit);
6938 		s->blamed_commit =
6939 		    STAILQ_FIRST(&s->blamed_commits);
6940 		err = run_blame(view);
6941 		if (err)
6942 			break;
6943 		break;
6944 	}
6945 	case 'L':
6946 		view->count = 0;
6947 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6948 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6949 		if (s->id_to_log)
6950 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6951 		break;
6952 	case KEY_ENTER:
6953 	case '\r': {
6954 		struct got_object_id *id = NULL;
6955 		struct got_object_qid *pid;
6956 		struct got_commit_object *commit = NULL;
6957 
6958 		view->count = 0;
6959 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6960 		    s->first_displayed_line, s->selected_line);
6961 		if (id == NULL)
6962 			break;
6963 		err = got_object_open_as_commit(&commit, s->repo, id);
6964 		if (err)
6965 			break;
6966 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6967 		if (*new_view) {
6968 			/* traversed from diff view, release diff resources  */
6969 			err = close_diff_view(*new_view);
6970 			if (err)
6971 				break;
6972 			diff_view = *new_view;
6973 		} else {
6974 			if (view_is_parent_view(view))
6975 				view_get_split(view, &begin_y, &begin_x);
6976 
6977 			diff_view = view_open(0, 0, begin_y, begin_x,
6978 			    TOG_VIEW_DIFF);
6979 			if (diff_view == NULL) {
6980 				got_object_commit_close(commit);
6981 				err = got_error_from_errno("view_open");
6982 				break;
6983 			}
6984 		}
6985 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6986 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6987 		got_object_commit_close(commit);
6988 		if (err)
6989 			break;
6990 		s->last_diffed_line = s->first_displayed_line - 1 +
6991 		    s->selected_line;
6992 		if (*new_view)
6993 			break;	/* still open from active diff view */
6994 		if (view_is_parent_view(view) &&
6995 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6996 			err = view_init_hsplit(view, begin_y);
6997 			if (err)
6998 				break;
6999 		}
7000 
7001 		view->focussed = 0;
7002 		diff_view->focussed = 1;
7003 		diff_view->mode = view->mode;
7004 		diff_view->nlines = view->lines - begin_y;
7005 		if (view_is_parent_view(view)) {
7006 			view_transfer_size(diff_view, view);
7007 			err = view_close_child(view);
7008 			if (err)
7009 				break;
7010 			err = view_set_child(view, diff_view);
7011 			if (err)
7012 				break;
7013 			view->focus_child = 1;
7014 		} else
7015 			*new_view = diff_view;
7016 		if (err)
7017 			break;
7018 		break;
7019 	}
7020 	case CTRL('d'):
7021 	case 'd':
7022 		nscroll /= 2;
7023 		/* FALL THROUGH */
7024 	case KEY_NPAGE:
7025 	case CTRL('f'):
7026 	case 'f':
7027 	case ' ':
7028 		if (s->last_displayed_line >= s->blame.nlines &&
7029 		    s->selected_line >= MIN(s->blame.nlines,
7030 		    view->nlines - 2)) {
7031 			view->count = 0;
7032 			break;
7033 		}
7034 		if (s->last_displayed_line >= s->blame.nlines &&
7035 		    s->selected_line < view->nlines - 2) {
7036 			s->selected_line +=
7037 			    MIN(nscroll, s->last_displayed_line -
7038 			    s->first_displayed_line - s->selected_line + 1);
7039 		}
7040 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
7041 			s->first_displayed_line += nscroll;
7042 		else
7043 			s->first_displayed_line =
7044 			    s->blame.nlines - (view->nlines - 3);
7045 		break;
7046 	case KEY_RESIZE:
7047 		if (s->selected_line > view->nlines - 2) {
7048 			s->selected_line = MIN(s->blame.nlines,
7049 			    view->nlines - 2);
7050 		}
7051 		break;
7052 	default:
7053 		view->count = 0;
7054 		break;
7055 	}
7056 	return thread_err ? thread_err : err;
7057 }
7058 
7059 static const struct got_error *
7060 reset_blame_view(struct tog_view *view)
7061 {
7062 	const struct got_error *err;
7063 	struct tog_blame_view_state *s = &view->state.blame;
7064 
7065 	view->count = 0;
7066 	s->done = 1;
7067 	err = stop_blame(&s->blame);
7068 	s->done = 0;
7069 	if (err)
7070 		return err;
7071 	return run_blame(view);
7072 }
7073 
7074 static const struct got_error *
7075 cmd_blame(int argc, char *argv[])
7076 {
7077 	const struct got_error *error;
7078 	struct got_repository *repo = NULL;
7079 	struct got_worktree *worktree = NULL;
7080 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7081 	char *link_target = NULL;
7082 	struct got_object_id *commit_id = NULL;
7083 	struct got_commit_object *commit = NULL;
7084 	char *keyword_idstr = NULL, *commit_id_str = NULL;
7085 	int ch;
7086 	struct tog_view *view = NULL;
7087 	int *pack_fds = NULL;
7088 
7089 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7090 		switch (ch) {
7091 		case 'c':
7092 			commit_id_str = optarg;
7093 			break;
7094 		case 'r':
7095 			repo_path = realpath(optarg, NULL);
7096 			if (repo_path == NULL)
7097 				return got_error_from_errno2("realpath",
7098 				    optarg);
7099 			break;
7100 		default:
7101 			usage_blame();
7102 			/* NOTREACHED */
7103 		}
7104 	}
7105 
7106 	argc -= optind;
7107 	argv += optind;
7108 
7109 	if (argc != 1)
7110 		usage_blame();
7111 
7112 	error = got_repo_pack_fds_open(&pack_fds);
7113 	if (error != NULL)
7114 		goto done;
7115 
7116 	if (repo_path == NULL) {
7117 		cwd = getcwd(NULL, 0);
7118 		if (cwd == NULL)
7119 			return got_error_from_errno("getcwd");
7120 		error = got_worktree_open(&worktree, cwd, NULL);
7121 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7122 			goto done;
7123 		if (worktree)
7124 			repo_path =
7125 			    strdup(got_worktree_get_repo_path(worktree));
7126 		else
7127 			repo_path = strdup(cwd);
7128 		if (repo_path == NULL) {
7129 			error = got_error_from_errno("strdup");
7130 			goto done;
7131 		}
7132 	}
7133 
7134 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7135 	if (error != NULL)
7136 		goto done;
7137 
7138 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
7139 	    worktree);
7140 	if (error)
7141 		goto done;
7142 
7143 	init_curses();
7144 
7145 	error = apply_unveil(got_repo_get_path(repo), NULL);
7146 	if (error)
7147 		goto done;
7148 
7149 	error = tog_load_refs(repo, 0);
7150 	if (error)
7151 		goto done;
7152 
7153 	if (commit_id_str == NULL) {
7154 		struct got_reference *head_ref;
7155 		error = got_ref_open(&head_ref, repo, worktree ?
7156 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
7157 		if (error != NULL)
7158 			goto done;
7159 		error = got_ref_resolve(&commit_id, repo, head_ref);
7160 		got_ref_close(head_ref);
7161 	} else {
7162 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_str,
7163 		    repo, worktree);
7164 		if (error != NULL)
7165 			goto done;
7166 		if (keyword_idstr != NULL)
7167 			commit_id_str = keyword_idstr;
7168 
7169 		error = got_repo_match_object_id(&commit_id, NULL,
7170 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7171 	}
7172 	if (error != NULL)
7173 		goto done;
7174 
7175 	error = got_object_open_as_commit(&commit, repo, commit_id);
7176 	if (error)
7177 		goto done;
7178 
7179 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
7180 	    commit, repo);
7181 	if (error)
7182 		goto done;
7183 
7184 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
7185 	if (view == NULL) {
7186 		error = got_error_from_errno("view_open");
7187 		goto done;
7188 	}
7189 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
7190 	    commit_id, repo);
7191 	if (error != NULL) {
7192 		if (view->close == NULL)
7193 			close_blame_view(view);
7194 		view_close(view);
7195 		goto done;
7196 	}
7197 	if (worktree) {
7198 		/* Release work tree lock. */
7199 		got_worktree_close(worktree);
7200 		worktree = NULL;
7201 	}
7202 	error = view_loop(view);
7203 done:
7204 	free(repo_path);
7205 	free(in_repo_path);
7206 	free(link_target);
7207 	free(cwd);
7208 	free(commit_id);
7209 	free(keyword_idstr);
7210 	if (commit)
7211 		got_object_commit_close(commit);
7212 	if (worktree)
7213 		got_worktree_close(worktree);
7214 	if (repo) {
7215 		const struct got_error *close_err = got_repo_close(repo);
7216 		if (error == NULL)
7217 			error = close_err;
7218 	}
7219 	if (pack_fds) {
7220 		const struct got_error *pack_err =
7221 		    got_repo_pack_fds_close(pack_fds);
7222 		if (error == NULL)
7223 			error = pack_err;
7224 	}
7225 	tog_free_refs();
7226 	return error;
7227 }
7228 
7229 static const struct got_error *
7230 draw_tree_entries(struct tog_view *view, const char *parent_path)
7231 {
7232 	struct tog_tree_view_state *s = &view->state.tree;
7233 	const struct got_error *err = NULL;
7234 	struct got_tree_entry *te;
7235 	wchar_t *wline;
7236 	char *index = NULL;
7237 	struct tog_color *tc;
7238 	int width, n, nentries, scrollx, i = 1;
7239 	int limit = view->nlines;
7240 
7241 	s->ndisplayed = 0;
7242 	if (view_is_hsplit_top(view))
7243 		--limit;  /* border */
7244 
7245 	werase(view->window);
7246 
7247 	if (limit == 0)
7248 		return NULL;
7249 
7250 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
7251 	    0, 0);
7252 	if (err)
7253 		return err;
7254 	if (view_needs_focus_indication(view))
7255 		wstandout(view->window);
7256 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
7257 	if (tc)
7258 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
7259 	waddwstr(view->window, wline);
7260 	free(wline);
7261 	wline = NULL;
7262 	while (width++ < view->ncols)
7263 		waddch(view->window, ' ');
7264 	if (tc)
7265 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
7266 	if (view_needs_focus_indication(view))
7267 		wstandend(view->window);
7268 	if (--limit <= 0)
7269 		return NULL;
7270 
7271 	i += s->selected;
7272 	if (s->first_displayed_entry) {
7273 		i += got_tree_entry_get_index(s->first_displayed_entry);
7274 		if (s->tree != s->root)
7275 			++i;  /* account for ".." entry */
7276 	}
7277 	nentries = got_object_tree_get_nentries(s->tree);
7278 	if (asprintf(&index, "[%d/%d] %s",
7279 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
7280 		return got_error_from_errno("asprintf");
7281 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
7282 	free(index);
7283 	if (err)
7284 		return err;
7285 	waddwstr(view->window, wline);
7286 	free(wline);
7287 	wline = NULL;
7288 	if (width < view->ncols - 1)
7289 		waddch(view->window, '\n');
7290 	if (--limit <= 0)
7291 		return NULL;
7292 	waddch(view->window, '\n');
7293 	if (--limit <= 0)
7294 		return NULL;
7295 
7296 	if (s->first_displayed_entry == NULL) {
7297 		te = got_object_tree_get_first_entry(s->tree);
7298 		if (s->selected == 0) {
7299 			if (view->focussed)
7300 				wstandout(view->window);
7301 			s->selected_entry = NULL;
7302 		}
7303 		waddstr(view->window, "  ..\n");	/* parent directory */
7304 		if (s->selected == 0 && view->focussed)
7305 			wstandend(view->window);
7306 		s->ndisplayed++;
7307 		if (--limit <= 0)
7308 			return NULL;
7309 		n = 1;
7310 	} else {
7311 		n = 0;
7312 		te = s->first_displayed_entry;
7313 	}
7314 
7315 	view->maxx = 0;
7316 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
7317 		char *line = NULL, *id_str = NULL, *link_target = NULL;
7318 		const char *modestr = "";
7319 		mode_t mode;
7320 
7321 		te = got_object_tree_get_entry(s->tree, i);
7322 		mode = got_tree_entry_get_mode(te);
7323 
7324 		if (s->show_ids) {
7325 			err = got_object_id_str(&id_str,
7326 			    got_tree_entry_get_id(te));
7327 			if (err)
7328 				return got_error_from_errno(
7329 				    "got_object_id_str");
7330 		}
7331 		if (got_object_tree_entry_is_submodule(te))
7332 			modestr = "$";
7333 		else if (S_ISLNK(mode)) {
7334 			int i;
7335 
7336 			err = got_tree_entry_get_symlink_target(&link_target,
7337 			    te, s->repo);
7338 			if (err) {
7339 				free(id_str);
7340 				return err;
7341 			}
7342 			for (i = 0; link_target[i] != '\0'; i++) {
7343 				if (!isprint((unsigned char)link_target[i]))
7344 					link_target[i] = '?';
7345 			}
7346 			modestr = "@";
7347 		}
7348 		else if (S_ISDIR(mode))
7349 			modestr = "/";
7350 		else if (mode & S_IXUSR)
7351 			modestr = "*";
7352 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
7353 		    got_tree_entry_get_name(te), modestr,
7354 		    link_target ? " -> ": "",
7355 		    link_target ? link_target : "") == -1) {
7356 			free(id_str);
7357 			free(link_target);
7358 			return got_error_from_errno("asprintf");
7359 		}
7360 		free(id_str);
7361 		free(link_target);
7362 
7363 		/* use full line width to determine view->maxx */
7364 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
7365 		if (err) {
7366 			free(line);
7367 			break;
7368 		}
7369 		view->maxx = MAX(view->maxx, width);
7370 		free(wline);
7371 		wline = NULL;
7372 
7373 		err = format_line(&wline, &width, &scrollx, line, view->x,
7374 		    view->ncols, 0, 0);
7375 		if (err) {
7376 			free(line);
7377 			break;
7378 		}
7379 		if (n == s->selected) {
7380 			if (view->focussed)
7381 				wstandout(view->window);
7382 			s->selected_entry = te;
7383 		}
7384 		tc = match_color(&s->colors, line);
7385 		if (tc)
7386 			wattr_on(view->window,
7387 			    COLOR_PAIR(tc->colorpair), NULL);
7388 		waddwstr(view->window, &wline[scrollx]);
7389 		if (tc)
7390 			wattr_off(view->window,
7391 			    COLOR_PAIR(tc->colorpair), NULL);
7392 		if (width < view->ncols)
7393 			waddch(view->window, '\n');
7394 		if (n == s->selected && view->focussed)
7395 			wstandend(view->window);
7396 		free(line);
7397 		free(wline);
7398 		wline = NULL;
7399 		n++;
7400 		s->ndisplayed++;
7401 		s->last_displayed_entry = te;
7402 		if (--limit <= 0)
7403 			break;
7404 	}
7405 
7406 	return err;
7407 }
7408 
7409 static void
7410 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
7411 {
7412 	struct got_tree_entry *te;
7413 	int isroot = s->tree == s->root;
7414 	int i = 0;
7415 
7416 	if (s->first_displayed_entry == NULL)
7417 		return;
7418 
7419 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
7420 	while (i++ < maxscroll) {
7421 		if (te == NULL) {
7422 			if (!isroot)
7423 				s->first_displayed_entry = NULL;
7424 			break;
7425 		}
7426 		s->first_displayed_entry = te;
7427 		te = got_tree_entry_get_prev(s->tree, te);
7428 	}
7429 }
7430 
7431 static const struct got_error *
7432 tree_scroll_down(struct tog_view *view, int maxscroll)
7433 {
7434 	struct tog_tree_view_state *s = &view->state.tree;
7435 	struct got_tree_entry *next, *last;
7436 	int n = 0;
7437 
7438 	if (s->first_displayed_entry)
7439 		next = got_tree_entry_get_next(s->tree,
7440 		    s->first_displayed_entry);
7441 	else
7442 		next = got_object_tree_get_first_entry(s->tree);
7443 
7444 	last = s->last_displayed_entry;
7445 	while (next && n++ < maxscroll) {
7446 		if (last) {
7447 			s->last_displayed_entry = last;
7448 			last = got_tree_entry_get_next(s->tree, last);
7449 		}
7450 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
7451 			s->first_displayed_entry = next;
7452 			next = got_tree_entry_get_next(s->tree, next);
7453 		}
7454 	}
7455 
7456 	return NULL;
7457 }
7458 
7459 static const struct got_error *
7460 tree_entry_path(char **path, struct tog_parent_trees *parents,
7461     struct got_tree_entry *te)
7462 {
7463 	const struct got_error *err = NULL;
7464 	struct tog_parent_tree *pt;
7465 	size_t len = 2; /* for leading slash and NUL */
7466 
7467 	TAILQ_FOREACH(pt, parents, entry)
7468 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
7469 		    + 1 /* slash */;
7470 	if (te)
7471 		len += strlen(got_tree_entry_get_name(te));
7472 
7473 	*path = calloc(1, len);
7474 	if (path == NULL)
7475 		return got_error_from_errno("calloc");
7476 
7477 	(*path)[0] = '/';
7478 	pt = TAILQ_LAST(parents, tog_parent_trees);
7479 	while (pt) {
7480 		const char *name = got_tree_entry_get_name(pt->selected_entry);
7481 		if (strlcat(*path, name, len) >= len) {
7482 			err = got_error(GOT_ERR_NO_SPACE);
7483 			goto done;
7484 		}
7485 		if (strlcat(*path, "/", len) >= len) {
7486 			err = got_error(GOT_ERR_NO_SPACE);
7487 			goto done;
7488 		}
7489 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
7490 	}
7491 	if (te) {
7492 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
7493 			err = got_error(GOT_ERR_NO_SPACE);
7494 			goto done;
7495 		}
7496 	}
7497 done:
7498 	if (err) {
7499 		free(*path);
7500 		*path = NULL;
7501 	}
7502 	return err;
7503 }
7504 
7505 static const struct got_error *
7506 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7507     struct got_tree_entry *te, struct tog_parent_trees *parents,
7508     struct got_object_id *commit_id, struct got_repository *repo)
7509 {
7510 	const struct got_error *err = NULL;
7511 	char *path;
7512 	struct tog_view *blame_view;
7513 
7514 	*new_view = NULL;
7515 
7516 	err = tree_entry_path(&path, parents, te);
7517 	if (err)
7518 		return err;
7519 
7520 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
7521 	if (blame_view == NULL) {
7522 		err = got_error_from_errno("view_open");
7523 		goto done;
7524 	}
7525 
7526 	err = open_blame_view(blame_view, path, commit_id, repo);
7527 	if (err) {
7528 		if (err->code == GOT_ERR_CANCELLED)
7529 			err = NULL;
7530 		view_close(blame_view);
7531 	} else
7532 		*new_view = blame_view;
7533 done:
7534 	free(path);
7535 	return err;
7536 }
7537 
7538 static const struct got_error *
7539 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
7540     struct tog_tree_view_state *s)
7541 {
7542 	struct tog_view *log_view;
7543 	const struct got_error *err = NULL;
7544 	char *path;
7545 
7546 	*new_view = NULL;
7547 
7548 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7549 	if (log_view == NULL)
7550 		return got_error_from_errno("view_open");
7551 
7552 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
7553 	if (err)
7554 		return err;
7555 
7556 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
7557 	    path, 0);
7558 	if (err)
7559 		view_close(log_view);
7560 	else
7561 		*new_view = log_view;
7562 	free(path);
7563 	return err;
7564 }
7565 
7566 static const struct got_error *
7567 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
7568     const char *head_ref_name, struct got_repository *repo)
7569 {
7570 	const struct got_error *err = NULL;
7571 	char *commit_id_str = NULL;
7572 	struct tog_tree_view_state *s = &view->state.tree;
7573 	struct got_commit_object *commit = NULL;
7574 
7575 	TAILQ_INIT(&s->parents);
7576 	STAILQ_INIT(&s->colors);
7577 
7578 	s->commit_id = got_object_id_dup(commit_id);
7579 	if (s->commit_id == NULL) {
7580 		err = got_error_from_errno("got_object_id_dup");
7581 		goto done;
7582 	}
7583 
7584 	err = got_object_open_as_commit(&commit, repo, commit_id);
7585 	if (err)
7586 		goto done;
7587 
7588 	/*
7589 	 * The root is opened here and will be closed when the view is closed.
7590 	 * Any visited subtrees and their path-wise parents are opened and
7591 	 * closed on demand.
7592 	 */
7593 	err = got_object_open_as_tree(&s->root, repo,
7594 	    got_object_commit_get_tree_id(commit));
7595 	if (err)
7596 		goto done;
7597 	s->tree = s->root;
7598 
7599 	err = got_object_id_str(&commit_id_str, commit_id);
7600 	if (err != NULL)
7601 		goto done;
7602 
7603 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
7604 		err = got_error_from_errno("asprintf");
7605 		goto done;
7606 	}
7607 
7608 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
7609 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
7610 	if (head_ref_name) {
7611 		s->head_ref_name = strdup(head_ref_name);
7612 		if (s->head_ref_name == NULL) {
7613 			err = got_error_from_errno("strdup");
7614 			goto done;
7615 		}
7616 	}
7617 	s->repo = repo;
7618 
7619 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7620 		err = add_color(&s->colors, "\\$$",
7621 		    TOG_COLOR_TREE_SUBMODULE,
7622 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
7623 		if (err)
7624 			goto done;
7625 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
7626 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
7627 		if (err)
7628 			goto done;
7629 		err = add_color(&s->colors, "/$",
7630 		    TOG_COLOR_TREE_DIRECTORY,
7631 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
7632 		if (err)
7633 			goto done;
7634 
7635 		err = add_color(&s->colors, "\\*$",
7636 		    TOG_COLOR_TREE_EXECUTABLE,
7637 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
7638 		if (err)
7639 			goto done;
7640 
7641 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
7642 		    get_color_value("TOG_COLOR_COMMIT"));
7643 		if (err)
7644 			goto done;
7645 	}
7646 
7647 	view->show = show_tree_view;
7648 	view->input = input_tree_view;
7649 	view->close = close_tree_view;
7650 	view->search_start = search_start_tree_view;
7651 	view->search_next = search_next_tree_view;
7652 done:
7653 	free(commit_id_str);
7654 	if (commit)
7655 		got_object_commit_close(commit);
7656 	if (err) {
7657 		if (view->close == NULL)
7658 			close_tree_view(view);
7659 		view_close(view);
7660 	}
7661 	return err;
7662 }
7663 
7664 static const struct got_error *
7665 close_tree_view(struct tog_view *view)
7666 {
7667 	struct tog_tree_view_state *s = &view->state.tree;
7668 
7669 	free_colors(&s->colors);
7670 	free(s->tree_label);
7671 	s->tree_label = NULL;
7672 	free(s->commit_id);
7673 	s->commit_id = NULL;
7674 	free(s->head_ref_name);
7675 	s->head_ref_name = NULL;
7676 	while (!TAILQ_EMPTY(&s->parents)) {
7677 		struct tog_parent_tree *parent;
7678 		parent = TAILQ_FIRST(&s->parents);
7679 		TAILQ_REMOVE(&s->parents, parent, entry);
7680 		if (parent->tree != s->root)
7681 			got_object_tree_close(parent->tree);
7682 		free(parent);
7683 
7684 	}
7685 	if (s->tree != NULL && s->tree != s->root)
7686 		got_object_tree_close(s->tree);
7687 	if (s->root)
7688 		got_object_tree_close(s->root);
7689 	return NULL;
7690 }
7691 
7692 static const struct got_error *
7693 search_start_tree_view(struct tog_view *view)
7694 {
7695 	struct tog_tree_view_state *s = &view->state.tree;
7696 
7697 	s->matched_entry = NULL;
7698 	return NULL;
7699 }
7700 
7701 static int
7702 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7703 {
7704 	regmatch_t regmatch;
7705 
7706 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7707 	    0) == 0;
7708 }
7709 
7710 static const struct got_error *
7711 search_next_tree_view(struct tog_view *view)
7712 {
7713 	struct tog_tree_view_state *s = &view->state.tree;
7714 	struct got_tree_entry *te = NULL;
7715 
7716 	if (!view->searching) {
7717 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7718 		return NULL;
7719 	}
7720 
7721 	if (s->matched_entry) {
7722 		if (view->searching == TOG_SEARCH_FORWARD) {
7723 			if (s->selected_entry)
7724 				te = got_tree_entry_get_next(s->tree,
7725 				    s->selected_entry);
7726 			else
7727 				te = got_object_tree_get_first_entry(s->tree);
7728 		} else {
7729 			if (s->selected_entry == NULL)
7730 				te = got_object_tree_get_last_entry(s->tree);
7731 			else
7732 				te = got_tree_entry_get_prev(s->tree,
7733 				    s->selected_entry);
7734 		}
7735 	} else {
7736 		if (s->selected_entry)
7737 			te = s->selected_entry;
7738 		else if (view->searching == TOG_SEARCH_FORWARD)
7739 			te = got_object_tree_get_first_entry(s->tree);
7740 		else
7741 			te = got_object_tree_get_last_entry(s->tree);
7742 	}
7743 
7744 	while (1) {
7745 		if (te == NULL) {
7746 			if (s->matched_entry == NULL) {
7747 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7748 				return NULL;
7749 			}
7750 			if (view->searching == TOG_SEARCH_FORWARD)
7751 				te = got_object_tree_get_first_entry(s->tree);
7752 			else
7753 				te = got_object_tree_get_last_entry(s->tree);
7754 		}
7755 
7756 		if (match_tree_entry(te, &view->regex)) {
7757 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7758 			s->matched_entry = te;
7759 			break;
7760 		}
7761 
7762 		if (view->searching == TOG_SEARCH_FORWARD)
7763 			te = got_tree_entry_get_next(s->tree, te);
7764 		else
7765 			te = got_tree_entry_get_prev(s->tree, te);
7766 	}
7767 
7768 	if (s->matched_entry) {
7769 		s->first_displayed_entry = s->matched_entry;
7770 		s->selected = 0;
7771 	}
7772 
7773 	return NULL;
7774 }
7775 
7776 static const struct got_error *
7777 show_tree_view(struct tog_view *view)
7778 {
7779 	const struct got_error *err = NULL;
7780 	struct tog_tree_view_state *s = &view->state.tree;
7781 	char *parent_path;
7782 
7783 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7784 	if (err)
7785 		return err;
7786 
7787 	err = draw_tree_entries(view, parent_path);
7788 	free(parent_path);
7789 
7790 	view_border(view);
7791 	return err;
7792 }
7793 
7794 static const struct got_error *
7795 tree_goto_line(struct tog_view *view, int nlines)
7796 {
7797 	const struct got_error		 *err = NULL;
7798 	struct tog_tree_view_state	 *s = &view->state.tree;
7799 	struct got_tree_entry		**fte, **lte, **ste;
7800 	int				  g, last, first = 1, i = 1;
7801 	int				  root = s->tree == s->root;
7802 	int				  off = root ? 1 : 2;
7803 
7804 	g = view->gline;
7805 	view->gline = 0;
7806 
7807 	if (g == 0)
7808 		g = 1;
7809 	else if (g > got_object_tree_get_nentries(s->tree))
7810 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7811 
7812 	fte = &s->first_displayed_entry;
7813 	lte = &s->last_displayed_entry;
7814 	ste = &s->selected_entry;
7815 
7816 	if (*fte != NULL) {
7817 		first = got_tree_entry_get_index(*fte);
7818 		first += off;  /* account for ".." */
7819 	}
7820 	last = got_tree_entry_get_index(*lte);
7821 	last += off;
7822 
7823 	if (g >= first && g <= last && g - first < nlines) {
7824 		s->selected = g - first;
7825 		return NULL;	/* gline is on the current page */
7826 	}
7827 
7828 	if (*ste != NULL) {
7829 		i = got_tree_entry_get_index(*ste);
7830 		i += off;
7831 	}
7832 
7833 	if (i < g) {
7834 		err = tree_scroll_down(view, g - i);
7835 		if (err)
7836 			return err;
7837 		if (got_tree_entry_get_index(*lte) >=
7838 		    got_object_tree_get_nentries(s->tree) - 1 &&
7839 		    first + s->selected < g &&
7840 		    s->selected < s->ndisplayed - 1) {
7841 			first = got_tree_entry_get_index(*fte);
7842 			first += off;
7843 			s->selected = g - first;
7844 		}
7845 	} else if (i > g)
7846 		tree_scroll_up(s, i - g);
7847 
7848 	if (g < nlines &&
7849 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7850 		s->selected = g - 1;
7851 
7852 	return NULL;
7853 }
7854 
7855 static const struct got_error *
7856 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7857 {
7858 	const struct got_error *err = NULL;
7859 	struct tog_tree_view_state *s = &view->state.tree;
7860 	struct got_tree_entry *te;
7861 	int n, nscroll = view->nlines - 3;
7862 
7863 	if (view->gline)
7864 		return tree_goto_line(view, nscroll);
7865 
7866 	switch (ch) {
7867 	case '0':
7868 	case '$':
7869 	case KEY_RIGHT:
7870 	case 'l':
7871 	case KEY_LEFT:
7872 	case 'h':
7873 		horizontal_scroll_input(view, ch);
7874 		break;
7875 	case 'i':
7876 		s->show_ids = !s->show_ids;
7877 		view->count = 0;
7878 		break;
7879 	case 'L':
7880 		view->count = 0;
7881 		if (!s->selected_entry)
7882 			break;
7883 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7884 		break;
7885 	case 'R':
7886 		view->count = 0;
7887 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7888 		break;
7889 	case 'g':
7890 	case '=':
7891 	case KEY_HOME:
7892 		s->selected = 0;
7893 		view->count = 0;
7894 		if (s->tree == s->root)
7895 			s->first_displayed_entry =
7896 			    got_object_tree_get_first_entry(s->tree);
7897 		else
7898 			s->first_displayed_entry = NULL;
7899 		break;
7900 	case 'G':
7901 	case '*':
7902 	case KEY_END: {
7903 		int eos = view->nlines - 3;
7904 
7905 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7906 			--eos;  /* border */
7907 		s->selected = 0;
7908 		view->count = 0;
7909 		te = got_object_tree_get_last_entry(s->tree);
7910 		for (n = 0; n < eos; n++) {
7911 			if (te == NULL) {
7912 				if (s->tree != s->root) {
7913 					s->first_displayed_entry = NULL;
7914 					n++;
7915 				}
7916 				break;
7917 			}
7918 			s->first_displayed_entry = te;
7919 			te = got_tree_entry_get_prev(s->tree, te);
7920 		}
7921 		if (n > 0)
7922 			s->selected = n - 1;
7923 		break;
7924 	}
7925 	case 'k':
7926 	case KEY_UP:
7927 	case CTRL('p'):
7928 		if (s->selected > 0) {
7929 			s->selected--;
7930 			break;
7931 		}
7932 		tree_scroll_up(s, 1);
7933 		if (s->selected_entry == NULL ||
7934 		    (s->tree == s->root && s->selected_entry ==
7935 		     got_object_tree_get_first_entry(s->tree)))
7936 			view->count = 0;
7937 		break;
7938 	case CTRL('u'):
7939 	case 'u':
7940 		nscroll /= 2;
7941 		/* FALL THROUGH */
7942 	case KEY_PPAGE:
7943 	case CTRL('b'):
7944 	case 'b':
7945 		if (s->tree == s->root) {
7946 			if (got_object_tree_get_first_entry(s->tree) ==
7947 			    s->first_displayed_entry)
7948 				s->selected -= MIN(s->selected, nscroll);
7949 		} else {
7950 			if (s->first_displayed_entry == NULL)
7951 				s->selected -= MIN(s->selected, nscroll);
7952 		}
7953 		tree_scroll_up(s, MAX(0, nscroll));
7954 		if (s->selected_entry == NULL ||
7955 		    (s->tree == s->root && s->selected_entry ==
7956 		     got_object_tree_get_first_entry(s->tree)))
7957 			view->count = 0;
7958 		break;
7959 	case 'j':
7960 	case KEY_DOWN:
7961 	case CTRL('n'):
7962 		if (s->selected < s->ndisplayed - 1) {
7963 			s->selected++;
7964 			break;
7965 		}
7966 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7967 		    == NULL) {
7968 			/* can't scroll any further */
7969 			view->count = 0;
7970 			break;
7971 		}
7972 		tree_scroll_down(view, 1);
7973 		break;
7974 	case CTRL('d'):
7975 	case 'd':
7976 		nscroll /= 2;
7977 		/* FALL THROUGH */
7978 	case KEY_NPAGE:
7979 	case CTRL('f'):
7980 	case 'f':
7981 	case ' ':
7982 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7983 		    == NULL) {
7984 			/* can't scroll any further; move cursor down */
7985 			if (s->selected < s->ndisplayed - 1)
7986 				s->selected += MIN(nscroll,
7987 				    s->ndisplayed - s->selected - 1);
7988 			else
7989 				view->count = 0;
7990 			break;
7991 		}
7992 		tree_scroll_down(view, nscroll);
7993 		break;
7994 	case KEY_ENTER:
7995 	case '\r':
7996 	case KEY_BACKSPACE:
7997 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7998 			struct tog_parent_tree *parent;
7999 			/* user selected '..' */
8000 			if (s->tree == s->root) {
8001 				view->count = 0;
8002 				break;
8003 			}
8004 			parent = TAILQ_FIRST(&s->parents);
8005 			TAILQ_REMOVE(&s->parents, parent,
8006 			    entry);
8007 			got_object_tree_close(s->tree);
8008 			s->tree = parent->tree;
8009 			s->first_displayed_entry =
8010 			    parent->first_displayed_entry;
8011 			s->selected_entry =
8012 			    parent->selected_entry;
8013 			s->selected = parent->selected;
8014 			if (s->selected > view->nlines - 3) {
8015 				err = offset_selection_down(view);
8016 				if (err)
8017 					break;
8018 			}
8019 			free(parent);
8020 		} else if (S_ISDIR(got_tree_entry_get_mode(
8021 		    s->selected_entry))) {
8022 			struct got_tree_object *subtree;
8023 			view->count = 0;
8024 			err = got_object_open_as_tree(&subtree, s->repo,
8025 			    got_tree_entry_get_id(s->selected_entry));
8026 			if (err)
8027 				break;
8028 			err = tree_view_visit_subtree(s, subtree);
8029 			if (err) {
8030 				got_object_tree_close(subtree);
8031 				break;
8032 			}
8033 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
8034 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
8035 		break;
8036 	case KEY_RESIZE:
8037 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
8038 			s->selected = view->nlines - 4;
8039 		view->count = 0;
8040 		break;
8041 	default:
8042 		view->count = 0;
8043 		break;
8044 	}
8045 
8046 	return err;
8047 }
8048 
8049 __dead static void
8050 usage_tree(void)
8051 {
8052 	endwin();
8053 	fprintf(stderr,
8054 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
8055 	    getprogname());
8056 	exit(1);
8057 }
8058 
8059 static const struct got_error *
8060 cmd_tree(int argc, char *argv[])
8061 {
8062 	const struct got_error *error;
8063 	struct got_repository *repo = NULL;
8064 	struct got_worktree *worktree = NULL;
8065 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8066 	struct got_object_id *commit_id = NULL;
8067 	struct got_commit_object *commit = NULL;
8068 	const char *commit_id_arg = NULL;
8069 	char *keyword_idstr = NULL, *label = NULL;
8070 	struct got_reference *ref = NULL;
8071 	const char *head_ref_name = NULL;
8072 	int ch;
8073 	struct tog_view *view;
8074 	int *pack_fds = NULL;
8075 
8076 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
8077 		switch (ch) {
8078 		case 'c':
8079 			commit_id_arg = optarg;
8080 			break;
8081 		case 'r':
8082 			repo_path = realpath(optarg, NULL);
8083 			if (repo_path == NULL)
8084 				return got_error_from_errno2("realpath",
8085 				    optarg);
8086 			break;
8087 		default:
8088 			usage_tree();
8089 			/* NOTREACHED */
8090 		}
8091 	}
8092 
8093 	argc -= optind;
8094 	argv += optind;
8095 
8096 	if (argc > 1)
8097 		usage_tree();
8098 
8099 	error = got_repo_pack_fds_open(&pack_fds);
8100 	if (error != NULL)
8101 		goto done;
8102 
8103 	if (repo_path == NULL) {
8104 		cwd = getcwd(NULL, 0);
8105 		if (cwd == NULL)
8106 			return got_error_from_errno("getcwd");
8107 		error = got_worktree_open(&worktree, cwd, NULL);
8108 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8109 			goto done;
8110 		if (worktree)
8111 			repo_path =
8112 			    strdup(got_worktree_get_repo_path(worktree));
8113 		else
8114 			repo_path = strdup(cwd);
8115 		if (repo_path == NULL) {
8116 			error = got_error_from_errno("strdup");
8117 			goto done;
8118 		}
8119 	}
8120 
8121 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8122 	if (error != NULL)
8123 		goto done;
8124 
8125 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8126 	    repo, worktree);
8127 	if (error)
8128 		goto done;
8129 
8130 	init_curses();
8131 
8132 	error = apply_unveil(got_repo_get_path(repo), NULL);
8133 	if (error)
8134 		goto done;
8135 
8136 	error = tog_load_refs(repo, 0);
8137 	if (error)
8138 		goto done;
8139 
8140 	if (commit_id_arg == NULL) {
8141 		error = got_repo_match_object_id(&commit_id, &label,
8142 		    worktree ? got_worktree_get_head_ref_name(worktree) :
8143 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8144 		if (error)
8145 			goto done;
8146 		head_ref_name = label;
8147 	} else {
8148 		error = got_keyword_to_idstr(&keyword_idstr, commit_id_arg,
8149 		    repo, worktree);
8150 		if (error != NULL)
8151 			goto done;
8152 		if (keyword_idstr != NULL)
8153 			commit_id_arg = keyword_idstr;
8154 
8155 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
8156 		if (error == NULL)
8157 			head_ref_name = got_ref_get_name(ref);
8158 		else if (error->code != GOT_ERR_NOT_REF)
8159 			goto done;
8160 		error = got_repo_match_object_id(&commit_id, NULL,
8161 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8162 		if (error)
8163 			goto done;
8164 	}
8165 
8166 	error = got_object_open_as_commit(&commit, repo, commit_id);
8167 	if (error)
8168 		goto done;
8169 
8170 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
8171 	if (view == NULL) {
8172 		error = got_error_from_errno("view_open");
8173 		goto done;
8174 	}
8175 	error = open_tree_view(view, commit_id, head_ref_name, repo);
8176 	if (error)
8177 		goto done;
8178 	if (!got_path_is_root_dir(in_repo_path)) {
8179 		error = tree_view_walk_path(&view->state.tree, commit,
8180 		    in_repo_path);
8181 		if (error)
8182 			goto done;
8183 	}
8184 
8185 	if (worktree) {
8186 		/* Release work tree lock. */
8187 		got_worktree_close(worktree);
8188 		worktree = NULL;
8189 	}
8190 	error = view_loop(view);
8191 done:
8192 	free(keyword_idstr);
8193 	free(repo_path);
8194 	free(cwd);
8195 	free(commit_id);
8196 	free(label);
8197 	if (ref)
8198 		got_ref_close(ref);
8199 	if (repo) {
8200 		const struct got_error *close_err = got_repo_close(repo);
8201 		if (error == NULL)
8202 			error = close_err;
8203 	}
8204 	if (pack_fds) {
8205 		const struct got_error *pack_err =
8206 		    got_repo_pack_fds_close(pack_fds);
8207 		if (error == NULL)
8208 			error = pack_err;
8209 	}
8210 	tog_free_refs();
8211 	return error;
8212 }
8213 
8214 static const struct got_error *
8215 ref_view_load_refs(struct tog_ref_view_state *s)
8216 {
8217 	struct got_reflist_entry *sre;
8218 	struct tog_reflist_entry *re;
8219 
8220 	s->nrefs = 0;
8221 	TAILQ_FOREACH(sre, &tog_refs, entry) {
8222 		if (strncmp(got_ref_get_name(sre->ref),
8223 		    "refs/got/", 9) == 0 &&
8224 		    strncmp(got_ref_get_name(sre->ref),
8225 		    "refs/got/backup/", 16) != 0)
8226 			continue;
8227 
8228 		re = malloc(sizeof(*re));
8229 		if (re == NULL)
8230 			return got_error_from_errno("malloc");
8231 
8232 		re->ref = got_ref_dup(sre->ref);
8233 		if (re->ref == NULL)
8234 			return got_error_from_errno("got_ref_dup");
8235 		re->idx = s->nrefs++;
8236 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
8237 	}
8238 
8239 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8240 	return NULL;
8241 }
8242 
8243 static void
8244 ref_view_free_refs(struct tog_ref_view_state *s)
8245 {
8246 	struct tog_reflist_entry *re;
8247 
8248 	while (!TAILQ_EMPTY(&s->refs)) {
8249 		re = TAILQ_FIRST(&s->refs);
8250 		TAILQ_REMOVE(&s->refs, re, entry);
8251 		got_ref_close(re->ref);
8252 		free(re);
8253 	}
8254 }
8255 
8256 static const struct got_error *
8257 open_ref_view(struct tog_view *view, struct got_repository *repo)
8258 {
8259 	const struct got_error *err = NULL;
8260 	struct tog_ref_view_state *s = &view->state.ref;
8261 
8262 	s->selected_entry = 0;
8263 	s->repo = repo;
8264 
8265 	TAILQ_INIT(&s->refs);
8266 	STAILQ_INIT(&s->colors);
8267 
8268 	err = ref_view_load_refs(s);
8269 	if (err)
8270 		goto done;
8271 
8272 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
8273 		err = add_color(&s->colors, "^refs/heads/",
8274 		    TOG_COLOR_REFS_HEADS,
8275 		    get_color_value("TOG_COLOR_REFS_HEADS"));
8276 		if (err)
8277 			goto done;
8278 
8279 		err = add_color(&s->colors, "^refs/tags/",
8280 		    TOG_COLOR_REFS_TAGS,
8281 		    get_color_value("TOG_COLOR_REFS_TAGS"));
8282 		if (err)
8283 			goto done;
8284 
8285 		err = add_color(&s->colors, "^refs/remotes/",
8286 		    TOG_COLOR_REFS_REMOTES,
8287 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
8288 		if (err)
8289 			goto done;
8290 
8291 		err = add_color(&s->colors, "^refs/got/backup/",
8292 		    TOG_COLOR_REFS_BACKUP,
8293 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
8294 		if (err)
8295 			goto done;
8296 	}
8297 
8298 	view->show = show_ref_view;
8299 	view->input = input_ref_view;
8300 	view->close = close_ref_view;
8301 	view->search_start = search_start_ref_view;
8302 	view->search_next = search_next_ref_view;
8303 done:
8304 	if (err) {
8305 		if (view->close == NULL)
8306 			close_ref_view(view);
8307 		view_close(view);
8308 	}
8309 	return err;
8310 }
8311 
8312 static const struct got_error *
8313 close_ref_view(struct tog_view *view)
8314 {
8315 	struct tog_ref_view_state *s = &view->state.ref;
8316 
8317 	ref_view_free_refs(s);
8318 	free_colors(&s->colors);
8319 
8320 	return NULL;
8321 }
8322 
8323 static const struct got_error *
8324 resolve_reflist_entry(struct got_object_id **commit_id,
8325     struct tog_reflist_entry *re, struct got_repository *repo)
8326 {
8327 	const struct got_error *err = NULL;
8328 	struct got_object_id *obj_id;
8329 	struct got_tag_object *tag = NULL;
8330 	int obj_type;
8331 
8332 	*commit_id = NULL;
8333 
8334 	err = got_ref_resolve(&obj_id, repo, re->ref);
8335 	if (err)
8336 		return err;
8337 
8338 	err = got_object_get_type(&obj_type, repo, obj_id);
8339 	if (err)
8340 		goto done;
8341 
8342 	switch (obj_type) {
8343 	case GOT_OBJ_TYPE_COMMIT:
8344 		*commit_id = obj_id;
8345 		break;
8346 	case GOT_OBJ_TYPE_TAG:
8347 		err = got_object_open_as_tag(&tag, repo, obj_id);
8348 		if (err)
8349 			goto done;
8350 		free(obj_id);
8351 		err = got_object_get_type(&obj_type, repo,
8352 		    got_object_tag_get_object_id(tag));
8353 		if (err)
8354 			goto done;
8355 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
8356 			err = got_error(GOT_ERR_OBJ_TYPE);
8357 			goto done;
8358 		}
8359 		*commit_id = got_object_id_dup(
8360 		    got_object_tag_get_object_id(tag));
8361 		if (*commit_id == NULL) {
8362 			err = got_error_from_errno("got_object_id_dup");
8363 			goto done;
8364 		}
8365 		break;
8366 	default:
8367 		err = got_error(GOT_ERR_OBJ_TYPE);
8368 		break;
8369 	}
8370 
8371 done:
8372 	if (tag)
8373 		got_object_tag_close(tag);
8374 	if (err) {
8375 		free(*commit_id);
8376 		*commit_id = NULL;
8377 	}
8378 	return err;
8379 }
8380 
8381 static const struct got_error *
8382 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
8383     struct tog_reflist_entry *re, struct got_repository *repo)
8384 {
8385 	struct tog_view *log_view;
8386 	const struct got_error *err = NULL;
8387 	struct got_object_id *commit_id = NULL;
8388 
8389 	*new_view = NULL;
8390 
8391 	err = resolve_reflist_entry(&commit_id, re, repo);
8392 	if (err) {
8393 		if (err->code != GOT_ERR_OBJ_TYPE)
8394 			return err;
8395 		else
8396 			return NULL;
8397 	}
8398 
8399 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
8400 	if (log_view == NULL) {
8401 		err = got_error_from_errno("view_open");
8402 		goto done;
8403 	}
8404 
8405 	err = open_log_view(log_view, commit_id, repo,
8406 	    got_ref_get_name(re->ref), "", 0);
8407 done:
8408 	if (err)
8409 		view_close(log_view);
8410 	else
8411 		*new_view = log_view;
8412 	free(commit_id);
8413 	return err;
8414 }
8415 
8416 static void
8417 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
8418 {
8419 	struct tog_reflist_entry *re;
8420 	int i = 0;
8421 
8422 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8423 		return;
8424 
8425 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
8426 	while (i++ < maxscroll) {
8427 		if (re == NULL)
8428 			break;
8429 		s->first_displayed_entry = re;
8430 		re = TAILQ_PREV(re, tog_reflist_head, entry);
8431 	}
8432 }
8433 
8434 static const struct got_error *
8435 ref_scroll_down(struct tog_view *view, int maxscroll)
8436 {
8437 	struct tog_ref_view_state *s = &view->state.ref;
8438 	struct tog_reflist_entry *next, *last;
8439 	int n = 0;
8440 
8441 	if (s->first_displayed_entry)
8442 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
8443 	else
8444 		next = TAILQ_FIRST(&s->refs);
8445 
8446 	last = s->last_displayed_entry;
8447 	while (next && n++ < maxscroll) {
8448 		if (last) {
8449 			s->last_displayed_entry = last;
8450 			last = TAILQ_NEXT(last, entry);
8451 		}
8452 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
8453 			s->first_displayed_entry = next;
8454 			next = TAILQ_NEXT(next, entry);
8455 		}
8456 	}
8457 
8458 	return NULL;
8459 }
8460 
8461 static const struct got_error *
8462 search_start_ref_view(struct tog_view *view)
8463 {
8464 	struct tog_ref_view_state *s = &view->state.ref;
8465 
8466 	s->matched_entry = NULL;
8467 	return NULL;
8468 }
8469 
8470 static int
8471 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
8472 {
8473 	regmatch_t regmatch;
8474 
8475 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
8476 	    0) == 0;
8477 }
8478 
8479 static const struct got_error *
8480 search_next_ref_view(struct tog_view *view)
8481 {
8482 	struct tog_ref_view_state *s = &view->state.ref;
8483 	struct tog_reflist_entry *re = NULL;
8484 
8485 	if (!view->searching) {
8486 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
8487 		return NULL;
8488 	}
8489 
8490 	if (s->matched_entry) {
8491 		if (view->searching == TOG_SEARCH_FORWARD) {
8492 			if (s->selected_entry)
8493 				re = TAILQ_NEXT(s->selected_entry, entry);
8494 			else
8495 				re = TAILQ_PREV(s->selected_entry,
8496 				    tog_reflist_head, entry);
8497 		} else {
8498 			if (s->selected_entry == NULL)
8499 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8500 			else
8501 				re = TAILQ_PREV(s->selected_entry,
8502 				    tog_reflist_head, entry);
8503 		}
8504 	} else {
8505 		if (s->selected_entry)
8506 			re = s->selected_entry;
8507 		else if (view->searching == TOG_SEARCH_FORWARD)
8508 			re = TAILQ_FIRST(&s->refs);
8509 		else
8510 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
8511 	}
8512 
8513 	while (1) {
8514 		if (re == NULL) {
8515 			if (s->matched_entry == NULL) {
8516 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
8517 				return NULL;
8518 			}
8519 			if (view->searching == TOG_SEARCH_FORWARD)
8520 				re = TAILQ_FIRST(&s->refs);
8521 			else
8522 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
8523 		}
8524 
8525 		if (match_reflist_entry(re, &view->regex)) {
8526 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
8527 			s->matched_entry = re;
8528 			break;
8529 		}
8530 
8531 		if (view->searching == TOG_SEARCH_FORWARD)
8532 			re = TAILQ_NEXT(re, entry);
8533 		else
8534 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8535 	}
8536 
8537 	if (s->matched_entry) {
8538 		s->first_displayed_entry = s->matched_entry;
8539 		s->selected = 0;
8540 	}
8541 
8542 	return NULL;
8543 }
8544 
8545 static const struct got_error *
8546 show_ref_view(struct tog_view *view)
8547 {
8548 	const struct got_error *err = NULL;
8549 	struct tog_ref_view_state *s = &view->state.ref;
8550 	struct tog_reflist_entry *re;
8551 	char *line = NULL;
8552 	wchar_t *wline;
8553 	struct tog_color *tc;
8554 	int width, n, scrollx;
8555 	int limit = view->nlines;
8556 
8557 	werase(view->window);
8558 
8559 	s->ndisplayed = 0;
8560 	if (view_is_hsplit_top(view))
8561 		--limit;  /* border */
8562 
8563 	if (limit == 0)
8564 		return NULL;
8565 
8566 	re = s->first_displayed_entry;
8567 
8568 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
8569 	    s->nrefs) == -1)
8570 		return got_error_from_errno("asprintf");
8571 
8572 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
8573 	if (err) {
8574 		free(line);
8575 		return err;
8576 	}
8577 	if (view_needs_focus_indication(view))
8578 		wstandout(view->window);
8579 	waddwstr(view->window, wline);
8580 	while (width++ < view->ncols)
8581 		waddch(view->window, ' ');
8582 	if (view_needs_focus_indication(view))
8583 		wstandend(view->window);
8584 	free(wline);
8585 	wline = NULL;
8586 	free(line);
8587 	line = NULL;
8588 	if (--limit <= 0)
8589 		return NULL;
8590 
8591 	n = 0;
8592 	view->maxx = 0;
8593 	while (re && limit > 0) {
8594 		char *line = NULL;
8595 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
8596 
8597 		if (s->show_date) {
8598 			struct got_commit_object *ci;
8599 			struct got_tag_object *tag;
8600 			struct got_object_id *id;
8601 			struct tm tm;
8602 			time_t t;
8603 
8604 			err = got_ref_resolve(&id, s->repo, re->ref);
8605 			if (err)
8606 				return err;
8607 			err = got_object_open_as_tag(&tag, s->repo, id);
8608 			if (err) {
8609 				if (err->code != GOT_ERR_OBJ_TYPE) {
8610 					free(id);
8611 					return err;
8612 				}
8613 				err = got_object_open_as_commit(&ci, s->repo,
8614 				    id);
8615 				if (err) {
8616 					free(id);
8617 					return err;
8618 				}
8619 				t = got_object_commit_get_committer_time(ci);
8620 				got_object_commit_close(ci);
8621 			} else {
8622 				t = got_object_tag_get_tagger_time(tag);
8623 				got_object_tag_close(tag);
8624 			}
8625 			free(id);
8626 			if (gmtime_r(&t, &tm) == NULL)
8627 				return got_error_from_errno("gmtime_r");
8628 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
8629 				return got_error(GOT_ERR_NO_SPACE);
8630 		}
8631 		if (got_ref_is_symbolic(re->ref)) {
8632 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
8633 			    ymd : "", got_ref_get_name(re->ref),
8634 			    got_ref_get_symref_target(re->ref)) == -1)
8635 				return got_error_from_errno("asprintf");
8636 		} else if (s->show_ids) {
8637 			struct got_object_id *id;
8638 			char *id_str;
8639 			err = got_ref_resolve(&id, s->repo, re->ref);
8640 			if (err)
8641 				return err;
8642 			err = got_object_id_str(&id_str, id);
8643 			if (err) {
8644 				free(id);
8645 				return err;
8646 			}
8647 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
8648 			    got_ref_get_name(re->ref), id_str) == -1) {
8649 				err = got_error_from_errno("asprintf");
8650 				free(id);
8651 				free(id_str);
8652 				return err;
8653 			}
8654 			free(id);
8655 			free(id_str);
8656 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
8657 		    got_ref_get_name(re->ref)) == -1)
8658 			return got_error_from_errno("asprintf");
8659 
8660 		/* use full line width to determine view->maxx */
8661 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0, 0);
8662 		if (err) {
8663 			free(line);
8664 			return err;
8665 		}
8666 		view->maxx = MAX(view->maxx, width);
8667 		free(wline);
8668 		wline = NULL;
8669 
8670 		err = format_line(&wline, &width, &scrollx, line, view->x,
8671 		    view->ncols, 0, 0);
8672 		if (err) {
8673 			free(line);
8674 			return err;
8675 		}
8676 		if (n == s->selected) {
8677 			if (view->focussed)
8678 				wstandout(view->window);
8679 			s->selected_entry = re;
8680 		}
8681 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
8682 		if (tc)
8683 			wattr_on(view->window,
8684 			    COLOR_PAIR(tc->colorpair), NULL);
8685 		waddwstr(view->window, &wline[scrollx]);
8686 		if (tc)
8687 			wattr_off(view->window,
8688 			    COLOR_PAIR(tc->colorpair), NULL);
8689 		if (width < view->ncols)
8690 			waddch(view->window, '\n');
8691 		if (n == s->selected && view->focussed)
8692 			wstandend(view->window);
8693 		free(line);
8694 		free(wline);
8695 		wline = NULL;
8696 		n++;
8697 		s->ndisplayed++;
8698 		s->last_displayed_entry = re;
8699 
8700 		limit--;
8701 		re = TAILQ_NEXT(re, entry);
8702 	}
8703 
8704 	view_border(view);
8705 	return err;
8706 }
8707 
8708 static const struct got_error *
8709 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
8710     struct tog_reflist_entry *re, struct got_repository *repo)
8711 {
8712 	const struct got_error *err = NULL;
8713 	struct got_object_id *commit_id = NULL;
8714 	struct tog_view *tree_view;
8715 
8716 	*new_view = NULL;
8717 
8718 	err = resolve_reflist_entry(&commit_id, re, repo);
8719 	if (err) {
8720 		if (err->code != GOT_ERR_OBJ_TYPE)
8721 			return err;
8722 		else
8723 			return NULL;
8724 	}
8725 
8726 
8727 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8728 	if (tree_view == NULL) {
8729 		err = got_error_from_errno("view_open");
8730 		goto done;
8731 	}
8732 
8733 	err = open_tree_view(tree_view, commit_id,
8734 	    got_ref_get_name(re->ref), repo);
8735 	if (err)
8736 		goto done;
8737 
8738 	*new_view = tree_view;
8739 done:
8740 	free(commit_id);
8741 	return err;
8742 }
8743 
8744 static const struct got_error *
8745 ref_goto_line(struct tog_view *view, int nlines)
8746 {
8747 	const struct got_error		*err = NULL;
8748 	struct tog_ref_view_state	*s = &view->state.ref;
8749 	int				 g, idx = s->selected_entry->idx;
8750 
8751 	g = view->gline;
8752 	view->gline = 0;
8753 
8754 	if (g == 0)
8755 		g = 1;
8756 	else if (g > s->nrefs)
8757 		g = s->nrefs;
8758 
8759 	if (g >= s->first_displayed_entry->idx + 1 &&
8760 	    g <= s->last_displayed_entry->idx + 1 &&
8761 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8762 		s->selected = g - s->first_displayed_entry->idx - 1;
8763 		return NULL;
8764 	}
8765 
8766 	if (idx + 1 < g) {
8767 		err = ref_scroll_down(view, g - idx - 1);
8768 		if (err)
8769 			return err;
8770 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8771 		    s->first_displayed_entry->idx + s->selected < g &&
8772 		    s->selected < s->ndisplayed - 1)
8773 			s->selected = g - s->first_displayed_entry->idx - 1;
8774 	} else if (idx + 1 > g)
8775 		ref_scroll_up(s, idx - g + 1);
8776 
8777 	if (g < nlines && s->first_displayed_entry->idx == 0)
8778 		s->selected = g - 1;
8779 
8780 	return NULL;
8781 
8782 }
8783 
8784 static const struct got_error *
8785 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8786 {
8787 	const struct got_error *err = NULL;
8788 	struct tog_ref_view_state *s = &view->state.ref;
8789 	struct tog_reflist_entry *re;
8790 	int n, nscroll = view->nlines - 1;
8791 
8792 	if (view->gline)
8793 		return ref_goto_line(view, nscroll);
8794 
8795 	switch (ch) {
8796 	case '0':
8797 	case '$':
8798 	case KEY_RIGHT:
8799 	case 'l':
8800 	case KEY_LEFT:
8801 	case 'h':
8802 		horizontal_scroll_input(view, ch);
8803 		break;
8804 	case 'i':
8805 		s->show_ids = !s->show_ids;
8806 		view->count = 0;
8807 		break;
8808 	case 'm':
8809 		s->show_date = !s->show_date;
8810 		view->count = 0;
8811 		break;
8812 	case 'o':
8813 		s->sort_by_date = !s->sort_by_date;
8814 		view->action = s->sort_by_date ? "sort by date" : "sort by name";
8815 		view->count = 0;
8816 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8817 		    got_ref_cmp_by_commit_timestamp_descending :
8818 		    tog_ref_cmp_by_name, s->repo);
8819 		if (err)
8820 			break;
8821 		got_reflist_object_id_map_free(tog_refs_idmap);
8822 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8823 		    &tog_refs, s->repo);
8824 		if (err)
8825 			break;
8826 		ref_view_free_refs(s);
8827 		err = ref_view_load_refs(s);
8828 		break;
8829 	case KEY_ENTER:
8830 	case '\r':
8831 		view->count = 0;
8832 		if (!s->selected_entry)
8833 			break;
8834 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8835 		break;
8836 	case 'T':
8837 		view->count = 0;
8838 		if (!s->selected_entry)
8839 			break;
8840 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8841 		break;
8842 	case 'g':
8843 	case '=':
8844 	case KEY_HOME:
8845 		s->selected = 0;
8846 		view->count = 0;
8847 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8848 		break;
8849 	case 'G':
8850 	case '*':
8851 	case KEY_END: {
8852 		int eos = view->nlines - 1;
8853 
8854 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8855 			--eos;  /* border */
8856 		s->selected = 0;
8857 		view->count = 0;
8858 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8859 		for (n = 0; n < eos; n++) {
8860 			if (re == NULL)
8861 				break;
8862 			s->first_displayed_entry = re;
8863 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8864 		}
8865 		if (n > 0)
8866 			s->selected = n - 1;
8867 		break;
8868 	}
8869 	case 'k':
8870 	case KEY_UP:
8871 	case CTRL('p'):
8872 		if (s->selected > 0) {
8873 			s->selected--;
8874 			break;
8875 		}
8876 		ref_scroll_up(s, 1);
8877 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8878 			view->count = 0;
8879 		break;
8880 	case CTRL('u'):
8881 	case 'u':
8882 		nscroll /= 2;
8883 		/* FALL THROUGH */
8884 	case KEY_PPAGE:
8885 	case CTRL('b'):
8886 	case 'b':
8887 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8888 			s->selected -= MIN(nscroll, s->selected);
8889 		ref_scroll_up(s, MAX(0, nscroll));
8890 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8891 			view->count = 0;
8892 		break;
8893 	case 'j':
8894 	case KEY_DOWN:
8895 	case CTRL('n'):
8896 		if (s->selected < s->ndisplayed - 1) {
8897 			s->selected++;
8898 			break;
8899 		}
8900 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8901 			/* can't scroll any further */
8902 			view->count = 0;
8903 			break;
8904 		}
8905 		ref_scroll_down(view, 1);
8906 		break;
8907 	case CTRL('d'):
8908 	case 'd':
8909 		nscroll /= 2;
8910 		/* FALL THROUGH */
8911 	case KEY_NPAGE:
8912 	case CTRL('f'):
8913 	case 'f':
8914 	case ' ':
8915 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8916 			/* can't scroll any further; move cursor down */
8917 			if (s->selected < s->ndisplayed - 1)
8918 				s->selected += MIN(nscroll,
8919 				    s->ndisplayed - s->selected - 1);
8920 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8921 				s->selected += s->ndisplayed - s->selected - 1;
8922 			view->count = 0;
8923 			break;
8924 		}
8925 		ref_scroll_down(view, nscroll);
8926 		break;
8927 	case CTRL('l'):
8928 		view->count = 0;
8929 		tog_free_refs();
8930 		err = tog_load_refs(s->repo, s->sort_by_date);
8931 		if (err)
8932 			break;
8933 		ref_view_free_refs(s);
8934 		err = ref_view_load_refs(s);
8935 		break;
8936 	case KEY_RESIZE:
8937 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8938 			s->selected = view->nlines - 2;
8939 		break;
8940 	default:
8941 		view->count = 0;
8942 		break;
8943 	}
8944 
8945 	return err;
8946 }
8947 
8948 __dead static void
8949 usage_ref(void)
8950 {
8951 	endwin();
8952 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8953 	    getprogname());
8954 	exit(1);
8955 }
8956 
8957 static const struct got_error *
8958 cmd_ref(int argc, char *argv[])
8959 {
8960 	const struct got_error *error;
8961 	struct got_repository *repo = NULL;
8962 	struct got_worktree *worktree = NULL;
8963 	char *cwd = NULL, *repo_path = NULL;
8964 	int ch;
8965 	struct tog_view *view;
8966 	int *pack_fds = NULL;
8967 
8968 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8969 		switch (ch) {
8970 		case 'r':
8971 			repo_path = realpath(optarg, NULL);
8972 			if (repo_path == NULL)
8973 				return got_error_from_errno2("realpath",
8974 				    optarg);
8975 			break;
8976 		default:
8977 			usage_ref();
8978 			/* NOTREACHED */
8979 		}
8980 	}
8981 
8982 	argc -= optind;
8983 	argv += optind;
8984 
8985 	if (argc > 1)
8986 		usage_ref();
8987 
8988 	error = got_repo_pack_fds_open(&pack_fds);
8989 	if (error != NULL)
8990 		goto done;
8991 
8992 	if (repo_path == NULL) {
8993 		cwd = getcwd(NULL, 0);
8994 		if (cwd == NULL)
8995 			return got_error_from_errno("getcwd");
8996 		error = got_worktree_open(&worktree, cwd, NULL);
8997 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8998 			goto done;
8999 		if (worktree)
9000 			repo_path =
9001 			    strdup(got_worktree_get_repo_path(worktree));
9002 		else
9003 			repo_path = strdup(cwd);
9004 		if (repo_path == NULL) {
9005 			error = got_error_from_errno("strdup");
9006 			goto done;
9007 		}
9008 	}
9009 
9010 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9011 	if (error != NULL)
9012 		goto done;
9013 
9014 	init_curses();
9015 
9016 	error = apply_unveil(got_repo_get_path(repo), NULL);
9017 	if (error)
9018 		goto done;
9019 
9020 	error = tog_load_refs(repo, 0);
9021 	if (error)
9022 		goto done;
9023 
9024 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
9025 	if (view == NULL) {
9026 		error = got_error_from_errno("view_open");
9027 		goto done;
9028 	}
9029 
9030 	error = open_ref_view(view, repo);
9031 	if (error)
9032 		goto done;
9033 
9034 	if (worktree) {
9035 		/* Release work tree lock. */
9036 		got_worktree_close(worktree);
9037 		worktree = NULL;
9038 	}
9039 	error = view_loop(view);
9040 done:
9041 	free(repo_path);
9042 	free(cwd);
9043 	if (repo) {
9044 		const struct got_error *close_err = got_repo_close(repo);
9045 		if (close_err)
9046 			error = close_err;
9047 	}
9048 	if (pack_fds) {
9049 		const struct got_error *pack_err =
9050 		    got_repo_pack_fds_close(pack_fds);
9051 		if (error == NULL)
9052 			error = pack_err;
9053 	}
9054 	tog_free_refs();
9055 	return error;
9056 }
9057 
9058 static const struct got_error*
9059 win_draw_center(WINDOW *win, size_t y, size_t x, size_t maxx, int focus,
9060     const char *str)
9061 {
9062 	size_t len;
9063 
9064 	if (win == NULL)
9065 		win = stdscr;
9066 
9067 	len = strlen(str);
9068 	x = x ? x : maxx > len ? (maxx - len) / 2 : 0;
9069 
9070 	if (focus)
9071 		wstandout(win);
9072 	if (mvwprintw(win, y, x, "%s", str) == ERR)
9073 		return got_error_msg(GOT_ERR_RANGE, "mvwprintw");
9074 	if (focus)
9075 		wstandend(win);
9076 
9077 	return NULL;
9078 }
9079 
9080 static const struct got_error *
9081 add_line_offset(off_t **line_offsets, size_t *nlines, off_t off)
9082 {
9083 	off_t *p;
9084 
9085 	p = reallocarray(*line_offsets, *nlines + 1, sizeof(off_t));
9086 	if (p == NULL) {
9087 		free(*line_offsets);
9088 		*line_offsets = NULL;
9089 		return got_error_from_errno("reallocarray");
9090 	}
9091 
9092 	*line_offsets = p;
9093 	(*line_offsets)[*nlines] = off;
9094 	++(*nlines);
9095 	return NULL;
9096 }
9097 
9098 static const struct got_error *
9099 max_key_str(int *ret, const struct tog_key_map *km, size_t n)
9100 {
9101 	*ret = 0;
9102 
9103 	for (;n > 0; --n, ++km) {
9104 		char	*t0, *t, *k;
9105 		size_t	 len = 1;
9106 
9107 		if (km->keys == NULL)
9108 			continue;
9109 
9110 		t = t0 = strdup(km->keys);
9111 		if (t0 == NULL)
9112 			return got_error_from_errno("strdup");
9113 
9114 		len += strlen(t);
9115 		while ((k = strsep(&t, " ")) != NULL)
9116 			len += strlen(k) > 1 ? 2 : 0;
9117 		free(t0);
9118 		*ret = MAX(*ret, len);
9119 	}
9120 
9121 	return NULL;
9122 }
9123 
9124 /*
9125  * Write keymap section headers, keys, and key info in km to f.
9126  * Save line offset to *off. If terminal has UTF8 encoding enabled,
9127  * wrap control and symbolic keys in guillemets, else use <>.
9128  */
9129 static const struct got_error *
9130 format_help_line(off_t *off, FILE *f, const struct tog_key_map *km, int width)
9131 {
9132 	int n, len = width;
9133 
9134 	if (km->keys) {
9135 		static const char *u8_glyph[] = {
9136 			"\xe2\x80\xb9", /* U+2039  (utf8 <) */
9137 			"\xe2\x80\xba"  /* U+203A  (utf8 >) */
9138 		};
9139 		char	*t0, *t, *k;
9140 		int	 cs, s, first = 1;
9141 
9142 		cs = got_locale_is_utf8();
9143 
9144 		t = t0 = strdup(km->keys);
9145 		if (t0 == NULL)
9146 			return got_error_from_errno("strdup");
9147 
9148 		len = strlen(km->keys);
9149 		while ((k = strsep(&t, " ")) != NULL) {
9150 			s = strlen(k) > 1;  /* control or symbolic key */
9151 			n = fprintf(f, "%s%s%s%s%s", first ? "  " : "",
9152 			    cs && s ? u8_glyph[0] : s ? "<" : "", k,
9153 			    cs && s ? u8_glyph[1] : s ? ">" : "", t ? " " : "");
9154 			if (n < 0) {
9155 				free(t0);
9156 				return got_error_from_errno("fprintf");
9157 			}
9158 			first = 0;
9159 			len += s ? 2 : 0;
9160 			*off += n;
9161 		}
9162 		free(t0);
9163 	}
9164 	n = fprintf(f, "%*s%s\n", width - len, width - len ? " " : "", km->info);
9165 	if (n < 0)
9166 		return got_error_from_errno("fprintf");
9167 	*off += n;
9168 
9169 	return NULL;
9170 }
9171 
9172 static const struct got_error *
9173 format_help(struct tog_help_view_state *s)
9174 {
9175 	const struct got_error		*err = NULL;
9176 	off_t				 off = 0;
9177 	int				 i, max, n, show = s->all;
9178 	static const struct tog_key_map	 km[] = {
9179 #define KEYMAP_(info, type)	{ NULL, (info), type }
9180 #define KEY_(keys, info)	{ (keys), (info), TOG_KEYMAP_KEYS }
9181 		GENERATE_HELP
9182 #undef KEYMAP_
9183 #undef KEY_
9184 	};
9185 
9186 	err = add_line_offset(&s->line_offsets, &s->nlines, 0);
9187 	if (err)
9188 		return err;
9189 
9190 	n = nitems(km);
9191 	err = max_key_str(&max, km, n);
9192 	if (err)
9193 		return err;
9194 
9195 	for (i = 0; i < n; ++i) {
9196 		if (km[i].keys == NULL) {
9197 			show = s->all;
9198 			if (km[i].type == TOG_KEYMAP_GLOBAL ||
9199 			    km[i].type == s->type || s->all)
9200 				show = 1;
9201 		}
9202 		if (show) {
9203 			err = format_help_line(&off, s->f, &km[i], max);
9204 			if (err)
9205 				return err;
9206 			err = add_line_offset(&s->line_offsets, &s->nlines, off);
9207 			if (err)
9208 				return err;
9209 		}
9210 	}
9211 	fputc('\n', s->f);
9212 	++off;
9213 	err = add_line_offset(&s->line_offsets, &s->nlines, off);
9214 	return err;
9215 }
9216 
9217 static const struct got_error *
9218 create_help(struct tog_help_view_state *s)
9219 {
9220 	FILE			*f;
9221 	const struct got_error	*err;
9222 
9223 	free(s->line_offsets);
9224 	s->line_offsets = NULL;
9225 	s->nlines = 0;
9226 
9227 	f = got_opentemp();
9228 	if (f == NULL)
9229 		return got_error_from_errno("got_opentemp");
9230 	s->f = f;
9231 
9232 	err = format_help(s);
9233 	if (err)
9234 		return err;
9235 
9236 	if (s->f && fflush(s->f) != 0)
9237 		return got_error_from_errno("fflush");
9238 
9239 	return NULL;
9240 }
9241 
9242 static const struct got_error *
9243 search_start_help_view(struct tog_view *view)
9244 {
9245 	view->state.help.matched_line = 0;
9246 	return NULL;
9247 }
9248 
9249 static void
9250 search_setup_help_view(struct tog_view *view, FILE **f, off_t **line_offsets,
9251     size_t *nlines, int **first, int **last, int **match, int **selected)
9252 {
9253 	struct tog_help_view_state *s = &view->state.help;
9254 
9255 	*f = s->f;
9256 	*nlines = s->nlines;
9257 	*line_offsets = s->line_offsets;
9258 	*match = &s->matched_line;
9259 	*first = &s->first_displayed_line;
9260 	*last = &s->last_displayed_line;
9261 	*selected = &s->selected_line;
9262 }
9263 
9264 static const struct got_error *
9265 show_help_view(struct tog_view *view)
9266 {
9267 	struct tog_help_view_state	*s = &view->state.help;
9268 	const struct got_error		*err;
9269 	regmatch_t			*regmatch = &view->regmatch;
9270 	wchar_t				*wline;
9271 	char				*line;
9272 	ssize_t				 linelen;
9273 	size_t				 linesz = 0;
9274 	int				 width, nprinted = 0, rc = 0;
9275 	int				 eos = view->nlines;
9276 
9277 	if (view_is_hsplit_top(view))
9278 		--eos;  /* account for border */
9279 
9280 	s->lineno = 0;
9281 	rewind(s->f);
9282 	werase(view->window);
9283 
9284 	if (view->gline > s->nlines - 1)
9285 		view->gline = s->nlines - 1;
9286 
9287 	err = win_draw_center(view->window, 0, 0, view->ncols,
9288 	    view_needs_focus_indication(view),
9289 	    "tog help (press q to return to tog)");
9290 	if (err)
9291 		return err;
9292 	if (eos <= 1)
9293 		return NULL;
9294 	waddstr(view->window, "\n\n");
9295 	eos -= 2;
9296 
9297 	s->eof = 0;
9298 	view->maxx = 0;
9299 	line = NULL;
9300 	while (eos > 0 && nprinted < eos) {
9301 		attr_t attr = 0;
9302 
9303 		linelen = getline(&line, &linesz, s->f);
9304 		if (linelen == -1) {
9305 			if (!feof(s->f)) {
9306 				free(line);
9307 				return got_ferror(s->f, GOT_ERR_IO);
9308 			}
9309 			s->eof = 1;
9310 			break;
9311 		}
9312 		if (++s->lineno < s->first_displayed_line)
9313 			continue;
9314 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
9315 			continue;
9316 		if (s->lineno == view->hiline)
9317 			attr = A_STANDOUT;
9318 
9319 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
9320 		    view->x ? 1 : 0);
9321 		if (err) {
9322 			free(line);
9323 			return err;
9324 		}
9325 		view->maxx = MAX(view->maxx, width);
9326 		free(wline);
9327 		wline = NULL;
9328 
9329 		if (attr)
9330 			wattron(view->window, attr);
9331 		if (s->first_displayed_line + nprinted == s->matched_line &&
9332 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
9333 			err = add_matched_line(&width, line, view->ncols - 1, 0,
9334 			    view->window, view->x, regmatch);
9335 			if (err) {
9336 				free(line);
9337 				return err;
9338 			}
9339 		} else {
9340 			int skip;
9341 
9342 			err = format_line(&wline, &width, &skip, line,
9343 			    view->x, view->ncols, 0, view->x ? 1 : 0);
9344 			if (err) {
9345 				free(line);
9346 				return err;
9347 			}
9348 			waddwstr(view->window, &wline[skip]);
9349 			free(wline);
9350 			wline = NULL;
9351 		}
9352 		if (s->lineno == view->hiline) {
9353 			while (width++ < view->ncols)
9354 				waddch(view->window, ' ');
9355 		} else {
9356 			if (width < view->ncols)
9357 				waddch(view->window, '\n');
9358 		}
9359 		if (attr)
9360 			wattroff(view->window, attr);
9361 		if (++nprinted == 1)
9362 			s->first_displayed_line = s->lineno;
9363 	}
9364 	free(line);
9365 	if (nprinted > 0)
9366 		s->last_displayed_line = s->first_displayed_line + nprinted - 1;
9367 	else
9368 		s->last_displayed_line = s->first_displayed_line;
9369 
9370 	view_border(view);
9371 
9372 	if (s->eof) {
9373 		rc = waddnstr(view->window,
9374 		    "See the tog(1) manual page for full documentation",
9375 		    view->ncols - 1);
9376 		if (rc == ERR)
9377 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9378 	} else {
9379 		wmove(view->window, view->nlines - 1, 0);
9380 		wclrtoeol(view->window);
9381 		wstandout(view->window);
9382 		rc = waddnstr(view->window, "scroll down for more...",
9383 		    view->ncols - 1);
9384 		if (rc == ERR)
9385 			return got_error_msg(GOT_ERR_RANGE, "waddnstr");
9386 		if (getcurx(view->window) < view->ncols - 6) {
9387 			rc = wprintw(view->window, "[%.0f%%]",
9388 			    100.00 * s->last_displayed_line / s->nlines);
9389 			if (rc == ERR)
9390 				return got_error_msg(GOT_ERR_IO, "wprintw");
9391 		}
9392 		wstandend(view->window);
9393 	}
9394 
9395 	return NULL;
9396 }
9397 
9398 static const struct got_error *
9399 input_help_view(struct tog_view **new_view, struct tog_view *view, int ch)
9400 {
9401 	struct tog_help_view_state	*s = &view->state.help;
9402 	const struct got_error		*err = NULL;
9403 	char				*line = NULL;
9404 	ssize_t				 linelen;
9405 	size_t				 linesz = 0;
9406 	int				 eos, nscroll;
9407 
9408 	eos = nscroll = view->nlines;
9409 	if (view_is_hsplit_top(view))
9410 		--eos;  /* border */
9411 
9412 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
9413 
9414 	switch (ch) {
9415 	case '0':
9416 	case '$':
9417 	case KEY_RIGHT:
9418 	case 'l':
9419 	case KEY_LEFT:
9420 	case 'h':
9421 		horizontal_scroll_input(view, ch);
9422 		break;
9423 	case 'g':
9424 	case KEY_HOME:
9425 		s->first_displayed_line = 1;
9426 		view->count = 0;
9427 		break;
9428 	case 'G':
9429 	case KEY_END:
9430 		view->count = 0;
9431 		if (s->eof)
9432 			break;
9433 		s->first_displayed_line = (s->nlines - eos) + 3;
9434 		s->eof = 1;
9435 		break;
9436 	case 'k':
9437 	case KEY_UP:
9438 		if (s->first_displayed_line > 1)
9439 			--s->first_displayed_line;
9440 		else
9441 			view->count = 0;
9442 		break;
9443 	case CTRL('u'):
9444 	case 'u':
9445 		nscroll /= 2;
9446 		/* FALL THROUGH */
9447 	case KEY_PPAGE:
9448 	case CTRL('b'):
9449 	case 'b':
9450 		if (s->first_displayed_line == 1) {
9451 			view->count = 0;
9452 			break;
9453 		}
9454 		while (--nscroll > 0 && s->first_displayed_line > 1)
9455 			s->first_displayed_line--;
9456 		break;
9457 	case 'j':
9458 	case KEY_DOWN:
9459 	case CTRL('n'):
9460 		if (!s->eof)
9461 			++s->first_displayed_line;
9462 		else
9463 			view->count = 0;
9464 		break;
9465 	case CTRL('d'):
9466 	case 'd':
9467 		nscroll /= 2;
9468 		/* FALL THROUGH */
9469 	case KEY_NPAGE:
9470 	case CTRL('f'):
9471 	case 'f':
9472 	case ' ':
9473 		if (s->eof) {
9474 			view->count = 0;
9475 			break;
9476 		}
9477 		while (!s->eof && --nscroll > 0) {
9478 			linelen = getline(&line, &linesz, s->f);
9479 			s->first_displayed_line++;
9480 			if (linelen == -1) {
9481 				if (feof(s->f))
9482 					s->eof = 1;
9483 				else
9484 					err = got_ferror(s->f, GOT_ERR_IO);
9485 				break;
9486 			}
9487 		}
9488 		free(line);
9489 		break;
9490 	default:
9491 		view->count = 0;
9492 		break;
9493 	}
9494 
9495 	return err;
9496 }
9497 
9498 static const struct got_error *
9499 close_help_view(struct tog_view *view)
9500 {
9501 	struct tog_help_view_state *s = &view->state.help;
9502 
9503 	free(s->line_offsets);
9504 	s->line_offsets = NULL;
9505 	if (fclose(s->f) == EOF)
9506 		return got_error_from_errno("fclose");
9507 
9508 	return NULL;
9509 }
9510 
9511 static const struct got_error *
9512 reset_help_view(struct tog_view *view)
9513 {
9514 	struct tog_help_view_state *s = &view->state.help;
9515 
9516 
9517 	if (s->f && fclose(s->f) == EOF)
9518 		return got_error_from_errno("fclose");
9519 
9520 	wclear(view->window);
9521 	view->count = 0;
9522 	view->x = 0;
9523 	s->all = !s->all;
9524 	s->first_displayed_line = 1;
9525 	s->last_displayed_line = view->nlines;
9526 	s->matched_line = 0;
9527 
9528 	return create_help(s);
9529 }
9530 
9531 static const struct got_error *
9532 open_help_view(struct tog_view *view, struct tog_view *parent)
9533 {
9534 	const struct got_error		*err = NULL;
9535 	struct tog_help_view_state	*s = &view->state.help;
9536 
9537 	s->type = (enum tog_keymap_type)parent->type;
9538 	s->first_displayed_line = 1;
9539 	s->last_displayed_line = view->nlines;
9540 	s->selected_line = 1;
9541 
9542 	view->show = show_help_view;
9543 	view->input = input_help_view;
9544 	view->reset = reset_help_view;
9545 	view->close = close_help_view;
9546 	view->search_start = search_start_help_view;
9547 	view->search_setup = search_setup_help_view;
9548 	view->search_next = search_next_view_match;
9549 
9550 	err = create_help(s);
9551 	return err;
9552 }
9553 
9554 static const struct got_error *
9555 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
9556     enum tog_view_type request, int y, int x)
9557 {
9558 	const struct got_error *err = NULL;
9559 
9560 	*new_view = NULL;
9561 
9562 	switch (request) {
9563 	case TOG_VIEW_DIFF:
9564 		if (view->type == TOG_VIEW_LOG) {
9565 			struct tog_log_view_state *s = &view->state.log;
9566 
9567 			err = open_diff_view_for_commit(new_view, y, x,
9568 			    s->selected_entry->commit, s->selected_entry->id,
9569 			    view, s->repo);
9570 		} else
9571 			return got_error_msg(GOT_ERR_NOT_IMPL,
9572 			    "parent/child view pair not supported");
9573 		break;
9574 	case TOG_VIEW_BLAME:
9575 		if (view->type == TOG_VIEW_TREE) {
9576 			struct tog_tree_view_state *s = &view->state.tree;
9577 
9578 			err = blame_tree_entry(new_view, y, x,
9579 			    s->selected_entry, &s->parents, s->commit_id,
9580 			    s->repo);
9581 		} else
9582 			return got_error_msg(GOT_ERR_NOT_IMPL,
9583 			    "parent/child view pair not supported");
9584 		break;
9585 	case TOG_VIEW_LOG:
9586 		if (view->type == TOG_VIEW_BLAME)
9587 			err = log_annotated_line(new_view, y, x,
9588 			    view->state.blame.repo, view->state.blame.id_to_log);
9589 		else if (view->type == TOG_VIEW_TREE)
9590 			err = log_selected_tree_entry(new_view, y, x,
9591 			    &view->state.tree);
9592 		else if (view->type == TOG_VIEW_REF)
9593 			err = log_ref_entry(new_view, y, x,
9594 			    view->state.ref.selected_entry,
9595 			    view->state.ref.repo);
9596 		else
9597 			return got_error_msg(GOT_ERR_NOT_IMPL,
9598 			    "parent/child view pair not supported");
9599 		break;
9600 	case TOG_VIEW_TREE:
9601 		if (view->type == TOG_VIEW_LOG)
9602 			err = browse_commit_tree(new_view, y, x,
9603 			    view->state.log.selected_entry,
9604 			    view->state.log.in_repo_path,
9605 			    view->state.log.head_ref_name,
9606 			    view->state.log.repo);
9607 		else if (view->type == TOG_VIEW_REF)
9608 			err = browse_ref_tree(new_view, y, x,
9609 			    view->state.ref.selected_entry,
9610 			    view->state.ref.repo);
9611 		else
9612 			return got_error_msg(GOT_ERR_NOT_IMPL,
9613 			    "parent/child view pair not supported");
9614 		break;
9615 	case TOG_VIEW_REF:
9616 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
9617 		if (*new_view == NULL)
9618 			return got_error_from_errno("view_open");
9619 		if (view->type == TOG_VIEW_LOG)
9620 			err = open_ref_view(*new_view, view->state.log.repo);
9621 		else if (view->type == TOG_VIEW_TREE)
9622 			err = open_ref_view(*new_view, view->state.tree.repo);
9623 		else
9624 			err = got_error_msg(GOT_ERR_NOT_IMPL,
9625 			    "parent/child view pair not supported");
9626 		if (err)
9627 			view_close(*new_view);
9628 		break;
9629 	case TOG_VIEW_HELP:
9630 		*new_view = view_open(0, 0, 0, 0, TOG_VIEW_HELP);
9631 		if (*new_view == NULL)
9632 			return got_error_from_errno("view_open");
9633 		err = open_help_view(*new_view, view);
9634 		if (err)
9635 			view_close(*new_view);
9636 		break;
9637 	default:
9638 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
9639 	}
9640 
9641 	return err;
9642 }
9643 
9644 /*
9645  * If view was scrolled down to move the selected line into view when opening a
9646  * horizontal split, scroll back up when closing the split/toggling fullscreen.
9647  */
9648 static void
9649 offset_selection_up(struct tog_view *view)
9650 {
9651 	switch (view->type) {
9652 	case TOG_VIEW_BLAME: {
9653 		struct tog_blame_view_state *s = &view->state.blame;
9654 		if (s->first_displayed_line == 1) {
9655 			s->selected_line = MAX(s->selected_line - view->offset,
9656 			    1);
9657 			break;
9658 		}
9659 		if (s->first_displayed_line > view->offset)
9660 			s->first_displayed_line -= view->offset;
9661 		else
9662 			s->first_displayed_line = 1;
9663 		s->selected_line += view->offset;
9664 		break;
9665 	}
9666 	case TOG_VIEW_LOG:
9667 		log_scroll_up(&view->state.log, view->offset);
9668 		view->state.log.selected += view->offset;
9669 		break;
9670 	case TOG_VIEW_REF:
9671 		ref_scroll_up(&view->state.ref, view->offset);
9672 		view->state.ref.selected += view->offset;
9673 		break;
9674 	case TOG_VIEW_TREE:
9675 		tree_scroll_up(&view->state.tree, view->offset);
9676 		view->state.tree.selected += view->offset;
9677 		break;
9678 	default:
9679 		break;
9680 	}
9681 
9682 	view->offset = 0;
9683 }
9684 
9685 /*
9686  * If the selected line is in the section of screen covered by the bottom split,
9687  * scroll down offset lines to move it into view and index its new position.
9688  */
9689 static const struct got_error *
9690 offset_selection_down(struct tog_view *view)
9691 {
9692 	const struct got_error	*err = NULL;
9693 	const struct got_error	*(*scrolld)(struct tog_view *, int);
9694 	int			*selected = NULL;
9695 	int			 header, offset;
9696 
9697 	switch (view->type) {
9698 	case TOG_VIEW_BLAME: {
9699 		struct tog_blame_view_state *s = &view->state.blame;
9700 		header = 3;
9701 		scrolld = NULL;
9702 		if (s->selected_line > view->nlines - header) {
9703 			offset = abs(view->nlines - s->selected_line - header);
9704 			s->first_displayed_line += offset;
9705 			s->selected_line -= offset;
9706 			view->offset = offset;
9707 		}
9708 		break;
9709 	}
9710 	case TOG_VIEW_LOG: {
9711 		struct tog_log_view_state *s = &view->state.log;
9712 		scrolld = &log_scroll_down;
9713 		header = view_is_parent_view(view) ? 3 : 2;
9714 		selected = &s->selected;
9715 		break;
9716 	}
9717 	case TOG_VIEW_REF: {
9718 		struct tog_ref_view_state *s = &view->state.ref;
9719 		scrolld = &ref_scroll_down;
9720 		header = 3;
9721 		selected = &s->selected;
9722 		break;
9723 	}
9724 	case TOG_VIEW_TREE: {
9725 		struct tog_tree_view_state *s = &view->state.tree;
9726 		scrolld = &tree_scroll_down;
9727 		header = 5;
9728 		selected = &s->selected;
9729 		break;
9730 	}
9731 	default:
9732 		selected = NULL;
9733 		scrolld = NULL;
9734 		header = 0;
9735 		break;
9736 	}
9737 
9738 	if (selected && *selected > view->nlines - header) {
9739 		offset = abs(view->nlines - *selected - header);
9740 		view->offset = offset;
9741 		if (scrolld && offset) {
9742 			err = scrolld(view, offset);
9743 			*selected -= offset;
9744 		}
9745 	}
9746 
9747 	return err;
9748 }
9749 
9750 static void
9751 list_commands(FILE *fp)
9752 {
9753 	size_t i;
9754 
9755 	fprintf(fp, "commands:");
9756 	for (i = 0; i < nitems(tog_commands); i++) {
9757 		const struct tog_cmd *cmd = &tog_commands[i];
9758 		fprintf(fp, " %s", cmd->name);
9759 	}
9760 	fputc('\n', fp);
9761 }
9762 
9763 __dead static void
9764 usage(int hflag, int status)
9765 {
9766 	FILE *fp = (status == 0) ? stdout : stderr;
9767 
9768 	fprintf(fp, "usage: %s [-hV] command [arg ...]\n",
9769 	    getprogname());
9770 	if (hflag) {
9771 		fprintf(fp, "lazy usage: %s path\n", getprogname());
9772 		list_commands(fp);
9773 	}
9774 	exit(status);
9775 }
9776 
9777 static char **
9778 make_argv(int argc, ...)
9779 {
9780 	va_list ap;
9781 	char **argv;
9782 	int i;
9783 
9784 	va_start(ap, argc);
9785 
9786 	argv = calloc(argc, sizeof(char *));
9787 	if (argv == NULL)
9788 		err(1, "calloc");
9789 	for (i = 0; i < argc; i++) {
9790 		argv[i] = strdup(va_arg(ap, char *));
9791 		if (argv[i] == NULL)
9792 			err(1, "strdup");
9793 	}
9794 
9795 	va_end(ap);
9796 	return argv;
9797 }
9798 
9799 /*
9800  * Try to convert 'tog path' into a 'tog log path' command.
9801  * The user could simply have mistyped the command rather than knowingly
9802  * provided a path. So check whether argv[0] can in fact be resolved
9803  * to a path in the HEAD commit and print a special error if not.
9804  * This hack is for mpi@ <3
9805  */
9806 static const struct got_error *
9807 tog_log_with_path(int argc, char *argv[])
9808 {
9809 	const struct got_error *error = NULL, *close_err;
9810 	const struct tog_cmd *cmd = NULL;
9811 	struct got_repository *repo = NULL;
9812 	struct got_worktree *worktree = NULL;
9813 	struct got_object_id *commit_id = NULL, *id = NULL;
9814 	struct got_commit_object *commit = NULL;
9815 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
9816 	char *commit_id_str = NULL, **cmd_argv = NULL;
9817 	int *pack_fds = NULL;
9818 
9819 	cwd = getcwd(NULL, 0);
9820 	if (cwd == NULL)
9821 		return got_error_from_errno("getcwd");
9822 
9823 	error = got_repo_pack_fds_open(&pack_fds);
9824 	if (error != NULL)
9825 		goto done;
9826 
9827 	error = got_worktree_open(&worktree, cwd, NULL);
9828 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
9829 		goto done;
9830 
9831 	if (worktree)
9832 		repo_path = strdup(got_worktree_get_repo_path(worktree));
9833 	else
9834 		repo_path = strdup(cwd);
9835 	if (repo_path == NULL) {
9836 		error = got_error_from_errno("strdup");
9837 		goto done;
9838 	}
9839 
9840 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
9841 	if (error != NULL)
9842 		goto done;
9843 
9844 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
9845 	    repo, worktree);
9846 	if (error)
9847 		goto done;
9848 
9849 	error = tog_load_refs(repo, 0);
9850 	if (error)
9851 		goto done;
9852 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
9853 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
9854 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
9855 	if (error)
9856 		goto done;
9857 
9858 	if (worktree) {
9859 		got_worktree_close(worktree);
9860 		worktree = NULL;
9861 	}
9862 
9863 	error = got_object_open_as_commit(&commit, repo, commit_id);
9864 	if (error)
9865 		goto done;
9866 
9867 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
9868 	if (error) {
9869 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
9870 			goto done;
9871 		fprintf(stderr, "%s: '%s' is no known command or path\n",
9872 		    getprogname(), argv[0]);
9873 		usage(1, 1);
9874 		/* not reached */
9875 	}
9876 
9877 	error = got_object_id_str(&commit_id_str, commit_id);
9878 	if (error)
9879 		goto done;
9880 
9881 	cmd = &tog_commands[0]; /* log */
9882 	argc = 4;
9883 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
9884 	error = cmd->cmd_main(argc, cmd_argv);
9885 done:
9886 	if (repo) {
9887 		close_err = got_repo_close(repo);
9888 		if (error == NULL)
9889 			error = close_err;
9890 	}
9891 	if (commit)
9892 		got_object_commit_close(commit);
9893 	if (worktree)
9894 		got_worktree_close(worktree);
9895 	if (pack_fds) {
9896 		const struct got_error *pack_err =
9897 		    got_repo_pack_fds_close(pack_fds);
9898 		if (error == NULL)
9899 			error = pack_err;
9900 	}
9901 	free(id);
9902 	free(commit_id_str);
9903 	free(commit_id);
9904 	free(cwd);
9905 	free(repo_path);
9906 	free(in_repo_path);
9907 	if (cmd_argv) {
9908 		int i;
9909 		for (i = 0; i < argc; i++)
9910 			free(cmd_argv[i]);
9911 		free(cmd_argv);
9912 	}
9913 	tog_free_refs();
9914 	return error;
9915 }
9916 
9917 int
9918 main(int argc, char *argv[])
9919 {
9920 	const struct got_error *io_err, *error = NULL;
9921 	const struct tog_cmd *cmd = NULL;
9922 	int ch, hflag = 0, Vflag = 0;
9923 	char **cmd_argv = NULL;
9924 	static const struct option longopts[] = {
9925 	    { "version", no_argument, NULL, 'V' },
9926 	    { NULL, 0, NULL, 0}
9927 	};
9928 	char *diff_algo_str = NULL;
9929 	const char *test_script_path;
9930 
9931 	setlocale(LC_CTYPE, "");
9932 
9933 	/*
9934 	 * Test mode init must happen before pledge() because "tty" will
9935 	 * not allow TTY-related ioctls to occur via regular files.
9936 	 */
9937 	test_script_path = getenv("TOG_TEST_SCRIPT");
9938 	if (test_script_path != NULL) {
9939 		error = init_mock_term(test_script_path);
9940 		if (error) {
9941 			fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
9942 			return 1;
9943 		}
9944 	} else if (!isatty(STDIN_FILENO))
9945 		errx(1, "standard input is not a tty");
9946 
9947 #if !defined(PROFILE)
9948 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
9949 	    NULL) == -1)
9950 		err(1, "pledge");
9951 #endif
9952 
9953 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
9954 		switch (ch) {
9955 		case 'h':
9956 			hflag = 1;
9957 			break;
9958 		case 'V':
9959 			Vflag = 1;
9960 			break;
9961 		default:
9962 			usage(hflag, 1);
9963 			/* NOTREACHED */
9964 		}
9965 	}
9966 
9967 	argc -= optind;
9968 	argv += optind;
9969 	optind = 1;
9970 	optreset = 1;
9971 
9972 	if (Vflag) {
9973 		got_version_print_str();
9974 		return 0;
9975 	}
9976 
9977 	if (argc == 0) {
9978 		if (hflag)
9979 			usage(hflag, 0);
9980 		/* Build an argument vector which runs a default command. */
9981 		cmd = &tog_commands[0];
9982 		argc = 1;
9983 		cmd_argv = make_argv(argc, cmd->name);
9984 	} else {
9985 		size_t i;
9986 
9987 		/* Did the user specify a command? */
9988 		for (i = 0; i < nitems(tog_commands); i++) {
9989 			if (strncmp(tog_commands[i].name, argv[0],
9990 			    strlen(argv[0])) == 0) {
9991 				cmd = &tog_commands[i];
9992 				break;
9993 			}
9994 		}
9995 	}
9996 
9997 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
9998 	if (diff_algo_str) {
9999 		if (strcasecmp(diff_algo_str, "patience") == 0)
10000 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
10001 		if (strcasecmp(diff_algo_str, "myers") == 0)
10002 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
10003 	}
10004 
10005 	if (cmd == NULL) {
10006 		if (argc != 1)
10007 			usage(0, 1);
10008 		/* No command specified; try log with a path */
10009 		error = tog_log_with_path(argc, argv);
10010 	} else {
10011 		if (hflag)
10012 			cmd->cmd_usage();
10013 		else
10014 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
10015 	}
10016 
10017 	if (using_mock_io) {
10018 		io_err = tog_io_close();
10019 		if (error == NULL)
10020 			error = io_err;
10021 	}
10022 	endwin();
10023 	if (cmd_argv) {
10024 		int i;
10025 		for (i = 0; i < argc; i++)
10026 			free(cmd_argv[i]);
10027 		free(cmd_argv);
10028 	}
10029 
10030 	if (error && error->code != GOT_ERR_CANCELLED &&
10031 	    error->code != GOT_ERR_EOF &&
10032 	    error->code != GOT_ERR_PRIVSEP_EXIT &&
10033 	    error->code != GOT_ERR_PRIVSEP_PIPE &&
10034 	    !(error->code == GOT_ERR_ERRNO && errno == EINTR)) {
10035 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
10036 		return 1;
10037 	}
10038 	return 0;
10039 }