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