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