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 <signal.h>
29 #include <stdlib.h>
30 #include <stdarg.h>
31 #include <stdio.h>
32 #include <getopt.h>
33 #include <string.h>
34 #include <err.h>
35 #include <unistd.h>
36 #include <limits.h>
37 #include <wchar.h>
38 #include <time.h>
39 #include <pthread.h>
40 #include <libgen.h>
41 #include <regex.h>
42 #include <sched.h>
43 
44 #include "got_version.h"
45 #include "got_error.h"
46 #include "got_object.h"
47 #include "got_reference.h"
48 #include "got_repository.h"
49 #include "got_diff.h"
50 #include "got_opentemp.h"
51 #include "got_utf8.h"
52 #include "got_cancel.h"
53 #include "got_commit_graph.h"
54 #include "got_blame.h"
55 #include "got_privsep.h"
56 #include "got_path.h"
57 #include "got_worktree.h"
58 
59 #ifndef MIN
60 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
61 #endif
62 
63 #ifndef MAX
64 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
65 #endif
66 
67 #define CTRL(x)		((x) & 0x1f)
68 
69 #ifndef nitems
70 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
71 #endif
72 
73 struct tog_cmd {
74 	const char *name;
75 	const struct got_error *(*cmd_main)(int, char *[]);
76 	void (*cmd_usage)(void);
77 };
78 
79 __dead static void	usage(int, int);
80 __dead static void	usage_log(void);
81 __dead static void	usage_diff(void);
82 __dead static void	usage_blame(void);
83 __dead static void	usage_tree(void);
84 __dead static void	usage_ref(void);
85 
86 static const struct got_error*	cmd_log(int, char *[]);
87 static const struct got_error*	cmd_diff(int, char *[]);
88 static const struct got_error*	cmd_blame(int, char *[]);
89 static const struct got_error*	cmd_tree(int, char *[]);
90 static const struct got_error*	cmd_ref(int, char *[]);
91 
92 static const struct tog_cmd tog_commands[] = {
93 	{ "log",	cmd_log,	usage_log },
94 	{ "diff",	cmd_diff,	usage_diff },
95 	{ "blame",	cmd_blame,	usage_blame },
96 	{ "tree",	cmd_tree,	usage_tree },
97 	{ "ref",	cmd_ref,	usage_ref },
98 };
99 
100 enum tog_view_type {
101 	TOG_VIEW_DIFF,
102 	TOG_VIEW_LOG,
103 	TOG_VIEW_BLAME,
104 	TOG_VIEW_TREE,
105 	TOG_VIEW_REF,
106 };
107 
108 enum tog_view_mode {
109 	TOG_VIEW_SPLIT_NONE,
110 	TOG_VIEW_SPLIT_VERT,
111 	TOG_VIEW_SPLIT_HRZN
112 };
113 
114 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
115 
116 #define TOG_EOF_STRING	"(END)"
117 
118 struct commit_queue_entry {
119 	TAILQ_ENTRY(commit_queue_entry) entry;
120 	struct got_object_id *id;
121 	struct got_commit_object *commit;
122 	int idx;
123 };
124 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
125 struct commit_queue {
126 	int ncommits;
127 	struct commit_queue_head head;
128 };
129 
130 struct tog_color {
131 	STAILQ_ENTRY(tog_color) entry;
132 	regex_t regex;
133 	short colorpair;
134 };
135 STAILQ_HEAD(tog_colors, tog_color);
136 
137 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
138 static struct got_reflist_object_id_map *tog_refs_idmap;
139 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
140 
141 static const struct got_error *
142 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
143     struct got_reference* re2)
144 {
145 	const char *name1 = got_ref_get_name(re1);
146 	const char *name2 = got_ref_get_name(re2);
147 	int isbackup1, isbackup2;
148 
149 	/* Sort backup refs towards the bottom of the list. */
150 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
151 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
152 	if (!isbackup1 && isbackup2) {
153 		*cmp = -1;
154 		return NULL;
155 	} else if (isbackup1 && !isbackup2) {
156 		*cmp = 1;
157 		return NULL;
158 	}
159 
160 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
161 	return NULL;
162 }
163 
164 static const struct got_error *
165 tog_load_refs(struct got_repository *repo, int sort_by_date)
166 {
167 	const struct got_error *err;
168 
169 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
170 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
171 	    repo);
172 	if (err)
173 		return err;
174 
175 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
176 	    repo);
177 }
178 
179 static void
180 tog_free_refs(void)
181 {
182 	if (tog_refs_idmap) {
183 		got_reflist_object_id_map_free(tog_refs_idmap);
184 		tog_refs_idmap = NULL;
185 	}
186 	got_ref_list_free(&tog_refs);
187 }
188 
189 static const struct got_error *
190 add_color(struct tog_colors *colors, const char *pattern,
191     int idx, short color)
192 {
193 	const struct got_error *err = NULL;
194 	struct tog_color *tc;
195 	int regerr = 0;
196 
197 	if (idx < 1 || idx > COLOR_PAIRS - 1)
198 		return NULL;
199 
200 	init_pair(idx, color, -1);
201 
202 	tc = calloc(1, sizeof(*tc));
203 	if (tc == NULL)
204 		return got_error_from_errno("calloc");
205 	regerr = regcomp(&tc->regex, pattern,
206 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
207 	if (regerr) {
208 		static char regerr_msg[512];
209 		static char err_msg[512];
210 		regerror(regerr, &tc->regex, regerr_msg,
211 		    sizeof(regerr_msg));
212 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
213 		    regerr_msg);
214 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
215 		free(tc);
216 		return err;
217 	}
218 	tc->colorpair = idx;
219 	STAILQ_INSERT_HEAD(colors, tc, entry);
220 	return NULL;
221 }
222 
223 static void
224 free_colors(struct tog_colors *colors)
225 {
226 	struct tog_color *tc;
227 
228 	while (!STAILQ_EMPTY(colors)) {
229 		tc = STAILQ_FIRST(colors);
230 		STAILQ_REMOVE_HEAD(colors, entry);
231 		regfree(&tc->regex);
232 		free(tc);
233 	}
234 }
235 
236 static struct tog_color *
237 get_color(struct tog_colors *colors, int colorpair)
238 {
239 	struct tog_color *tc = NULL;
240 
241 	STAILQ_FOREACH(tc, colors, entry) {
242 		if (tc->colorpair == colorpair)
243 			return tc;
244 	}
245 
246 	return NULL;
247 }
248 
249 static int
250 default_color_value(const char *envvar)
251 {
252 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
253 		return COLOR_MAGENTA;
254 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
255 		return COLOR_CYAN;
256 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
257 		return COLOR_YELLOW;
258 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
259 		return COLOR_GREEN;
260 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
261 		return COLOR_MAGENTA;
262 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
263 		return COLOR_MAGENTA;
264 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
265 		return COLOR_CYAN;
266 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
267 		return COLOR_GREEN;
268 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
269 		return COLOR_GREEN;
270 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
271 		return COLOR_CYAN;
272 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
273 		return COLOR_YELLOW;
274 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
275 		return COLOR_GREEN;
276 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
277 		return COLOR_MAGENTA;
278 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
279 		return COLOR_YELLOW;
280 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
281 		return COLOR_CYAN;
282 
283 	return -1;
284 }
285 
286 static int
287 get_color_value(const char *envvar)
288 {
289 	const char *val = getenv(envvar);
290 
291 	if (val == NULL)
292 		return default_color_value(envvar);
293 
294 	if (strcasecmp(val, "black") == 0)
295 		return COLOR_BLACK;
296 	if (strcasecmp(val, "red") == 0)
297 		return COLOR_RED;
298 	if (strcasecmp(val, "green") == 0)
299 		return COLOR_GREEN;
300 	if (strcasecmp(val, "yellow") == 0)
301 		return COLOR_YELLOW;
302 	if (strcasecmp(val, "blue") == 0)
303 		return COLOR_BLUE;
304 	if (strcasecmp(val, "magenta") == 0)
305 		return COLOR_MAGENTA;
306 	if (strcasecmp(val, "cyan") == 0)
307 		return COLOR_CYAN;
308 	if (strcasecmp(val, "white") == 0)
309 		return COLOR_WHITE;
310 	if (strcasecmp(val, "default") == 0)
311 		return -1;
312 
313 	return default_color_value(envvar);
314 }
315 
316 struct tog_diff_view_state {
317 	struct got_object_id *id1, *id2;
318 	const char *label1, *label2;
319 	FILE *f, *f1, *f2;
320 	int fd1, fd2;
321 	int lineno;
322 	int first_displayed_line;
323 	int last_displayed_line;
324 	int eof;
325 	int diff_context;
326 	int ignore_whitespace;
327 	int force_text_diff;
328 	struct got_repository *repo;
329 	struct got_diff_line *lines;
330 	size_t nlines;
331 	int matched_line;
332 	int selected_line;
333 
334 	/* passed from log or blame view; may be NULL */
335 	struct tog_view *parent_view;
336 };
337 
338 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
339 static volatile sig_atomic_t tog_thread_error;
340 
341 struct tog_log_thread_args {
342 	pthread_cond_t need_commits;
343 	pthread_cond_t commit_loaded;
344 	int commits_needed;
345 	int load_all;
346 	struct got_commit_graph *graph;
347 	struct commit_queue *commits;
348 	const char *in_repo_path;
349 	struct got_object_id *start_id;
350 	struct got_repository *repo;
351 	int *pack_fds;
352 	int log_complete;
353 	sig_atomic_t *quit;
354 	struct commit_queue_entry **first_displayed_entry;
355 	struct commit_queue_entry **selected_entry;
356 	int *searching;
357 	int *search_next_done;
358 	regex_t *regex;
359 };
360 
361 struct tog_log_view_state {
362 	struct commit_queue commits;
363 	struct commit_queue_entry *first_displayed_entry;
364 	struct commit_queue_entry *last_displayed_entry;
365 	struct commit_queue_entry *selected_entry;
366 	int selected;
367 	char *in_repo_path;
368 	char *head_ref_name;
369 	int log_branches;
370 	struct got_repository *repo;
371 	struct got_object_id *start_id;
372 	sig_atomic_t quit;
373 	pthread_t thread;
374 	struct tog_log_thread_args thread_args;
375 	struct commit_queue_entry *matched_entry;
376 	struct commit_queue_entry *search_entry;
377 	struct tog_colors colors;
378 	int use_committer;
379 };
380 
381 #define TOG_COLOR_DIFF_MINUS		1
382 #define TOG_COLOR_DIFF_PLUS		2
383 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
384 #define TOG_COLOR_DIFF_META		4
385 #define TOG_COLOR_TREE_SUBMODULE	5
386 #define TOG_COLOR_TREE_SYMLINK		6
387 #define TOG_COLOR_TREE_DIRECTORY	7
388 #define TOG_COLOR_TREE_EXECUTABLE	8
389 #define TOG_COLOR_COMMIT		9
390 #define TOG_COLOR_AUTHOR		10
391 #define TOG_COLOR_DATE			11
392 #define TOG_COLOR_REFS_HEADS		12
393 #define TOG_COLOR_REFS_TAGS		13
394 #define TOG_COLOR_REFS_REMOTES		14
395 #define TOG_COLOR_REFS_BACKUP		15
396 
397 struct tog_blame_cb_args {
398 	struct tog_blame_line *lines; /* one per line */
399 	int nlines;
400 
401 	struct tog_view *view;
402 	struct got_object_id *commit_id;
403 	int *quit;
404 };
405 
406 struct tog_blame_thread_args {
407 	const char *path;
408 	struct got_repository *repo;
409 	struct tog_blame_cb_args *cb_args;
410 	int *complete;
411 	got_cancel_cb cancel_cb;
412 	void *cancel_arg;
413 };
414 
415 struct tog_blame {
416 	FILE *f;
417 	off_t filesize;
418 	struct tog_blame_line *lines;
419 	int nlines;
420 	off_t *line_offsets;
421 	pthread_t thread;
422 	struct tog_blame_thread_args thread_args;
423 	struct tog_blame_cb_args cb_args;
424 	const char *path;
425 	int *pack_fds;
426 };
427 
428 struct tog_blame_view_state {
429 	int first_displayed_line;
430 	int last_displayed_line;
431 	int selected_line;
432 	int last_diffed_line;
433 	int blame_complete;
434 	int eof;
435 	int done;
436 	struct got_object_id_queue blamed_commits;
437 	struct got_object_qid *blamed_commit;
438 	char *path;
439 	struct got_repository *repo;
440 	struct got_object_id *commit_id;
441 	struct got_object_id *id_to_log;
442 	struct tog_blame blame;
443 	int matched_line;
444 	struct tog_colors colors;
445 };
446 
447 struct tog_parent_tree {
448 	TAILQ_ENTRY(tog_parent_tree) entry;
449 	struct got_tree_object *tree;
450 	struct got_tree_entry *first_displayed_entry;
451 	struct got_tree_entry *selected_entry;
452 	int selected;
453 };
454 
455 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
456 
457 struct tog_tree_view_state {
458 	char *tree_label;
459 	struct got_object_id *commit_id;/* commit which this tree belongs to */
460 	struct got_tree_object *root;	/* the commit's root tree entry */
461 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
462 	struct got_tree_entry *first_displayed_entry;
463 	struct got_tree_entry *last_displayed_entry;
464 	struct got_tree_entry *selected_entry;
465 	int ndisplayed, selected, show_ids;
466 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
467 	char *head_ref_name;
468 	struct got_repository *repo;
469 	struct got_tree_entry *matched_entry;
470 	struct tog_colors colors;
471 };
472 
473 struct tog_reflist_entry {
474 	TAILQ_ENTRY(tog_reflist_entry) entry;
475 	struct got_reference *ref;
476 	int idx;
477 };
478 
479 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
480 
481 struct tog_ref_view_state {
482 	struct tog_reflist_head refs;
483 	struct tog_reflist_entry *first_displayed_entry;
484 	struct tog_reflist_entry *last_displayed_entry;
485 	struct tog_reflist_entry *selected_entry;
486 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
487 	struct got_repository *repo;
488 	struct tog_reflist_entry *matched_entry;
489 	struct tog_colors colors;
490 };
491 
492 /*
493  * We implement two types of views: parent views and child views.
494  *
495  * The 'Tab' key switches focus between a parent view and its child view.
496  * Child views are shown side-by-side to their parent view, provided
497  * there is enough screen estate.
498  *
499  * When a new view is opened from within a parent view, this new view
500  * becomes a child view of the parent view, replacing any existing child.
501  *
502  * When a new view is opened from within a child view, this new view
503  * becomes a parent view which will obscure the views below until the
504  * user quits the new parent view by typing 'q'.
505  *
506  * This list of views contains parent views only.
507  * Child views are only pointed to by their parent view.
508  */
509 TAILQ_HEAD(tog_view_list_head, tog_view);
510 
511 struct tog_view {
512 	TAILQ_ENTRY(tog_view) entry;
513 	WINDOW *window;
514 	PANEL *panel;
515 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
516 	int resized_y, resized_x; /* begin_y/x based on user resizing */
517 	int maxx, x; /* max column and current start column */
518 	int lines, cols; /* copies of LINES and COLS */
519 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
520 	int gline, hiline; /* navigate to and highlight this nG line */
521 	int ch, count; /* current keymap and count prefix */
522 	int resized; /* set when in a resize event */
523 	int focussed; /* Only set on one parent or child view at a time. */
524 	int dying;
525 	struct tog_view *parent;
526 	struct tog_view *child;
527 
528 	/*
529 	 * This flag is initially set on parent views when a new child view
530 	 * is created. It gets toggled when the 'Tab' key switches focus
531 	 * between parent and child.
532 	 * The flag indicates whether focus should be passed on to our child
533 	 * view if this parent view gets picked for focus after another parent
534 	 * view was closed. This prevents child views from losing focus in such
535 	 * situations.
536 	 */
537 	int focus_child;
538 
539 	enum tog_view_mode mode;
540 	/* type-specific state */
541 	enum tog_view_type type;
542 	union {
543 		struct tog_diff_view_state diff;
544 		struct tog_log_view_state log;
545 		struct tog_blame_view_state blame;
546 		struct tog_tree_view_state tree;
547 		struct tog_ref_view_state ref;
548 	} state;
549 
550 	const struct got_error *(*show)(struct tog_view *);
551 	const struct got_error *(*input)(struct tog_view **,
552 	    struct tog_view *, int);
553 	const struct got_error *(*reset)(struct tog_view *);
554 	const struct got_error *(*resize)(struct tog_view *, int);
555 	const struct got_error *(*close)(struct tog_view *);
556 
557 	const struct got_error *(*search_start)(struct tog_view *);
558 	const struct got_error *(*search_next)(struct tog_view *);
559 	int search_started;
560 	int searching;
561 #define TOG_SEARCH_FORWARD	1
562 #define TOG_SEARCH_BACKWARD	2
563 	int search_next_done;
564 #define TOG_SEARCH_HAVE_MORE	1
565 #define TOG_SEARCH_NO_MORE	2
566 #define TOG_SEARCH_HAVE_NONE	3
567 	regex_t regex;
568 	regmatch_t regmatch;
569 };
570 
571 static const struct got_error *open_diff_view(struct tog_view *,
572     struct got_object_id *, struct got_object_id *,
573     const char *, const char *, int, int, int, struct tog_view *,
574     struct got_repository *);
575 static const struct got_error *show_diff_view(struct tog_view *);
576 static const struct got_error *input_diff_view(struct tog_view **,
577     struct tog_view *, int);
578 static const struct got_error *reset_diff_view(struct tog_view *);
579 static const struct got_error* close_diff_view(struct tog_view *);
580 static const struct got_error *search_start_diff_view(struct tog_view *);
581 static const struct got_error *search_next_diff_view(struct tog_view *);
582 
583 static const struct got_error *open_log_view(struct tog_view *,
584     struct got_object_id *, struct got_repository *,
585     const char *, const char *, int);
586 static const struct got_error * show_log_view(struct tog_view *);
587 static const struct got_error *input_log_view(struct tog_view **,
588     struct tog_view *, int);
589 static const struct got_error *resize_log_view(struct tog_view *, int);
590 static const struct got_error *close_log_view(struct tog_view *);
591 static const struct got_error *search_start_log_view(struct tog_view *);
592 static const struct got_error *search_next_log_view(struct tog_view *);
593 
594 static const struct got_error *open_blame_view(struct tog_view *, char *,
595     struct got_object_id *, struct got_repository *);
596 static const struct got_error *show_blame_view(struct tog_view *);
597 static const struct got_error *input_blame_view(struct tog_view **,
598     struct tog_view *, int);
599 static const struct got_error *reset_blame_view(struct tog_view *);
600 static const struct got_error *close_blame_view(struct tog_view *);
601 static const struct got_error *search_start_blame_view(struct tog_view *);
602 static const struct got_error *search_next_blame_view(struct tog_view *);
603 
604 static const struct got_error *open_tree_view(struct tog_view *,
605     struct got_object_id *, const char *, struct got_repository *);
606 static const struct got_error *show_tree_view(struct tog_view *);
607 static const struct got_error *input_tree_view(struct tog_view **,
608     struct tog_view *, int);
609 static const struct got_error *close_tree_view(struct tog_view *);
610 static const struct got_error *search_start_tree_view(struct tog_view *);
611 static const struct got_error *search_next_tree_view(struct tog_view *);
612 
613 static const struct got_error *open_ref_view(struct tog_view *,
614     struct got_repository *);
615 static const struct got_error *show_ref_view(struct tog_view *);
616 static const struct got_error *input_ref_view(struct tog_view **,
617     struct tog_view *, int);
618 static const struct got_error *close_ref_view(struct tog_view *);
619 static const struct got_error *search_start_ref_view(struct tog_view *);
620 static const struct got_error *search_next_ref_view(struct tog_view *);
621 
622 static volatile sig_atomic_t tog_sigwinch_received;
623 static volatile sig_atomic_t tog_sigpipe_received;
624 static volatile sig_atomic_t tog_sigcont_received;
625 static volatile sig_atomic_t tog_sigint_received;
626 static volatile sig_atomic_t tog_sigterm_received;
627 
628 static void
629 tog_sigwinch(int signo)
630 {
631 	tog_sigwinch_received = 1;
632 }
633 
634 static void
635 tog_sigpipe(int signo)
636 {
637 	tog_sigpipe_received = 1;
638 }
639 
640 static void
641 tog_sigcont(int signo)
642 {
643 	tog_sigcont_received = 1;
644 }
645 
646 static void
647 tog_sigint(int signo)
648 {
649 	tog_sigint_received = 1;
650 }
651 
652 static void
653 tog_sigterm(int signo)
654 {
655 	tog_sigterm_received = 1;
656 }
657 
658 static int
659 tog_fatal_signal_received(void)
660 {
661 	return (tog_sigpipe_received ||
662 	    tog_sigint_received || tog_sigint_received);
663 }
664 
665 static const struct got_error *
666 view_close(struct tog_view *view)
667 {
668 	const struct got_error *err = NULL, *child_err = NULL;
669 
670 	if (view->child) {
671 		child_err = view_close(view->child);
672 		view->child = NULL;
673 	}
674 	if (view->close)
675 		err = view->close(view);
676 	if (view->panel)
677 		del_panel(view->panel);
678 	if (view->window)
679 		delwin(view->window);
680 	free(view);
681 	return err ? err : child_err;
682 }
683 
684 static struct tog_view *
685 view_open(int nlines, int ncols, int begin_y, int begin_x,
686     enum tog_view_type type)
687 {
688 	struct tog_view *view = calloc(1, sizeof(*view));
689 
690 	if (view == NULL)
691 		return NULL;
692 
693 	view->type = type;
694 	view->lines = LINES;
695 	view->cols = COLS;
696 	view->nlines = nlines ? nlines : LINES - begin_y;
697 	view->ncols = ncols ? ncols : COLS - begin_x;
698 	view->begin_y = begin_y;
699 	view->begin_x = begin_x;
700 	view->window = newwin(nlines, ncols, begin_y, begin_x);
701 	if (view->window == NULL) {
702 		view_close(view);
703 		return NULL;
704 	}
705 	view->panel = new_panel(view->window);
706 	if (view->panel == NULL ||
707 	    set_panel_userptr(view->panel, view) != OK) {
708 		view_close(view);
709 		return NULL;
710 	}
711 
712 	keypad(view->window, TRUE);
713 	return view;
714 }
715 
716 static int
717 view_split_begin_x(int begin_x)
718 {
719 	if (begin_x > 0 || COLS < 120)
720 		return 0;
721 	return (COLS - MAX(COLS / 2, 80));
722 }
723 
724 /* XXX Stub till we decide what to do. */
725 static int
726 view_split_begin_y(int lines)
727 {
728 	return lines * HSPLIT_SCALE;
729 }
730 
731 static const struct got_error *view_resize(struct tog_view *);
732 
733 static const struct got_error *
734 view_splitscreen(struct tog_view *view)
735 {
736 	const struct got_error *err = NULL;
737 
738 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
739 		if (view->resized_y && view->resized_y < view->lines)
740 			view->begin_y = view->resized_y;
741 		else
742 			view->begin_y = view_split_begin_y(view->nlines);
743 		view->begin_x = 0;
744 	} else if (!view->resized) {
745 		if (view->resized_x && view->resized_x < view->cols - 1 &&
746 		    view->cols > 119)
747 			view->begin_x = view->resized_x;
748 		else
749 			view->begin_x = view_split_begin_x(0);
750 		view->begin_y = 0;
751 	}
752 	view->nlines = LINES - view->begin_y;
753 	view->ncols = COLS - view->begin_x;
754 	view->lines = LINES;
755 	view->cols = COLS;
756 	err = view_resize(view);
757 	if (err)
758 		return err;
759 
760 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
761 		view->parent->nlines = view->begin_y;
762 
763 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
764 		return got_error_from_errno("mvwin");
765 
766 	return NULL;
767 }
768 
769 static const struct got_error *
770 view_fullscreen(struct tog_view *view)
771 {
772 	const struct got_error *err = NULL;
773 
774 	view->begin_x = 0;
775 	view->begin_y = view->resized ? view->begin_y : 0;
776 	view->nlines = view->resized ? view->nlines : LINES;
777 	view->ncols = COLS;
778 	view->lines = LINES;
779 	view->cols = COLS;
780 	err = view_resize(view);
781 	if (err)
782 		return err;
783 
784 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
785 		return got_error_from_errno("mvwin");
786 
787 	return NULL;
788 }
789 
790 static int
791 view_is_parent_view(struct tog_view *view)
792 {
793 	return view->parent == NULL;
794 }
795 
796 static int
797 view_is_splitscreen(struct tog_view *view)
798 {
799 	return view->begin_x > 0 || view->begin_y > 0;
800 }
801 
802 static int
803 view_is_fullscreen(struct tog_view *view)
804 {
805 	return view->nlines == LINES && view->ncols == COLS;
806 }
807 
808 static int
809 view_is_hsplit_top(struct tog_view *view)
810 {
811 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
812 	    view_is_splitscreen(view->child);
813 }
814 
815 static void
816 view_border(struct tog_view *view)
817 {
818 	PANEL *panel;
819 	const struct tog_view *view_above;
820 
821 	if (view->parent)
822 		return view_border(view->parent);
823 
824 	panel = panel_above(view->panel);
825 	if (panel == NULL)
826 		return;
827 
828 	view_above = panel_userptr(panel);
829 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
830 		mvwhline(view->window, view_above->begin_y - 1,
831 		    view->begin_x, got_locale_is_utf8() ?
832 		    ACS_HLINE : '-', view->ncols);
833 	else
834 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
835 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
836 }
837 
838 static const struct got_error *view_init_hsplit(struct tog_view *, int);
839 static const struct got_error *request_log_commits(struct tog_view *);
840 static const struct got_error *offset_selection_down(struct tog_view *);
841 static void offset_selection_up(struct tog_view *);
842 static void view_get_split(struct tog_view *, int *, int *);
843 
844 static const struct got_error *
845 view_resize(struct tog_view *view)
846 {
847 	const struct got_error	*err = NULL;
848 	int			 dif, nlines, ncols;
849 
850 	dif = LINES - view->lines;  /* line difference */
851 
852 	if (view->lines > LINES)
853 		nlines = view->nlines - (view->lines - LINES);
854 	else
855 		nlines = view->nlines + (LINES - view->lines);
856 	if (view->cols > COLS)
857 		ncols = view->ncols - (view->cols - COLS);
858 	else
859 		ncols = view->ncols + (COLS - view->cols);
860 
861 	if (view->child) {
862 		int hs = view->child->begin_y;
863 
864 		if (!view_is_fullscreen(view))
865 			view->child->begin_x = view_split_begin_x(view->begin_x);
866 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
867 		    view->child->begin_x == 0) {
868 			ncols = COLS;
869 
870 			view_fullscreen(view->child);
871 			if (view->child->focussed)
872 				show_panel(view->child->panel);
873 			else
874 				show_panel(view->panel);
875 		} else {
876 			ncols = view->child->begin_x;
877 
878 			view_splitscreen(view->child);
879 			show_panel(view->child->panel);
880 		}
881 		/*
882 		 * XXX This is ugly and needs to be moved into the above
883 		 * logic but "works" for now and my attempts at moving it
884 		 * break either 'tab' or 'F' key maps in horizontal splits.
885 		 */
886 		if (hs) {
887 			err = view_splitscreen(view->child);
888 			if (err)
889 				return err;
890 			if (dif < 0) { /* top split decreased */
891 				err = offset_selection_down(view);
892 				if (err)
893 					return err;
894 			}
895 			view_border(view);
896 			update_panels();
897 			doupdate();
898 			show_panel(view->child->panel);
899 			nlines = view->nlines;
900 		}
901 	} else if (view->parent == NULL)
902 		ncols = COLS;
903 
904 	if (view->resize && dif > 0) {
905 		err = view->resize(view, dif);
906 		if (err)
907 			return err;
908 	}
909 
910 	if (wresize(view->window, nlines, ncols) == ERR)
911 		return got_error_from_errno("wresize");
912 	if (replace_panel(view->panel, view->window) == ERR)
913 		return got_error_from_errno("replace_panel");
914 	wclear(view->window);
915 
916 	view->nlines = nlines;
917 	view->ncols = ncols;
918 	view->lines = LINES;
919 	view->cols = COLS;
920 
921 	return NULL;
922 }
923 
924 static const struct got_error *
925 resize_log_view(struct tog_view *view, int increase)
926 {
927 	struct tog_log_view_state	*s = &view->state.log;
928 	const struct got_error		*err = NULL;
929 	int				 n = 0;
930 
931 	if (s->selected_entry)
932 		n = s->selected_entry->idx + view->lines - s->selected;
933 
934 	/*
935 	 * Request commits to account for the increased
936 	 * height so we have enough to populate the view.
937 	 */
938 	if (s->commits.ncommits < n) {
939 		view->nscrolled = n - s->commits.ncommits + increase + 1;
940 		err = request_log_commits(view);
941 	}
942 
943 	return err;
944 }
945 
946 static void
947 view_adjust_offset(struct tog_view *view, int n)
948 {
949 	if (n == 0)
950 		return;
951 
952 	if (view->parent && view->parent->offset) {
953 		if (view->parent->offset + n >= 0)
954 			view->parent->offset += n;
955 		else
956 			view->parent->offset = 0;
957 	} else if (view->offset) {
958 		if (view->offset - n >= 0)
959 			view->offset -= n;
960 		else
961 			view->offset = 0;
962 	}
963 }
964 
965 static const struct got_error *
966 view_resize_split(struct tog_view *view, int resize)
967 {
968 	const struct got_error	*err = NULL;
969 	struct tog_view		*v = NULL;
970 
971 	if (view->parent)
972 		v = view->parent;
973 	else
974 		v = view;
975 
976 	if (!v->child || !view_is_splitscreen(v->child))
977 		return NULL;
978 
979 	v->resized = v->child->resized = resize;  /* lock for resize event */
980 
981 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
982 		if (v->child->resized_y)
983 			v->child->begin_y = v->child->resized_y;
984 		if (view->parent)
985 			v->child->begin_y -= resize;
986 		else
987 			v->child->begin_y += resize;
988 		if (v->child->begin_y < 3) {
989 			view->count = 0;
990 			v->child->begin_y = 3;
991 		} else if (v->child->begin_y > LINES - 1) {
992 			view->count = 0;
993 			v->child->begin_y = LINES - 1;
994 		}
995 		v->ncols = COLS;
996 		v->child->ncols = COLS;
997 		view_adjust_offset(view, resize);
998 		err = view_init_hsplit(v, v->child->begin_y);
999 		if (err)
1000 			return err;
1001 		v->child->resized_y = v->child->begin_y;
1002 	} else {
1003 		if (v->child->resized_x)
1004 			v->child->begin_x = v->child->resized_x;
1005 		if (view->parent)
1006 			v->child->begin_x -= resize;
1007 		else
1008 			v->child->begin_x += resize;
1009 		if (v->child->begin_x < 11) {
1010 			view->count = 0;
1011 			v->child->begin_x = 11;
1012 		} else if (v->child->begin_x > COLS - 1) {
1013 			view->count = 0;
1014 			v->child->begin_x = COLS - 1;
1015 		}
1016 		v->child->resized_x = v->child->begin_x;
1017 	}
1018 
1019 	v->child->mode = v->mode;
1020 	v->child->nlines = v->lines - v->child->begin_y;
1021 	v->child->ncols = v->cols - v->child->begin_x;
1022 	v->focus_child = 1;
1023 
1024 	err = view_fullscreen(v);
1025 	if (err)
1026 		return err;
1027 	err = view_splitscreen(v->child);
1028 	if (err)
1029 		return err;
1030 
1031 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1032 		err = offset_selection_down(v->child);
1033 		if (err)
1034 			return err;
1035 	}
1036 
1037 	if (v->resize)
1038 		err = v->resize(v, 0);
1039 	else if (v->child->resize)
1040 		err = v->child->resize(v->child, 0);
1041 
1042 	v->resized = v->child->resized = 0;
1043 
1044 	return err;
1045 }
1046 
1047 static void
1048 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1049 {
1050 	struct tog_view *v = src->child ? src->child : src;
1051 
1052 	dst->resized_x = v->resized_x;
1053 	dst->resized_y = v->resized_y;
1054 }
1055 
1056 static const struct got_error *
1057 view_close_child(struct tog_view *view)
1058 {
1059 	const struct got_error *err = NULL;
1060 
1061 	if (view->child == NULL)
1062 		return NULL;
1063 
1064 	err = view_close(view->child);
1065 	view->child = NULL;
1066 	return err;
1067 }
1068 
1069 static const struct got_error *
1070 view_set_child(struct tog_view *view, struct tog_view *child)
1071 {
1072 	const struct got_error *err = NULL;
1073 
1074 	view->child = child;
1075 	child->parent = view;
1076 
1077 	err = view_resize(view);
1078 	if (err)
1079 		return err;
1080 
1081 	if (view->child->resized_x || view->child->resized_y)
1082 		err = view_resize_split(view, 0);
1083 
1084 	return err;
1085 }
1086 
1087 static const struct got_error *view_dispatch_request(struct tog_view **,
1088     struct tog_view *, enum tog_view_type, int, int);
1089 
1090 static const struct got_error *
1091 view_request_new(struct tog_view **requested, struct tog_view *view,
1092     enum tog_view_type request)
1093 {
1094 	struct tog_view		*new_view = NULL;
1095 	const struct got_error	*err;
1096 	int			 y = 0, x = 0;
1097 
1098 	*requested = NULL;
1099 
1100 	if (view_is_parent_view(view))
1101 		view_get_split(view, &y, &x);
1102 
1103 	err = view_dispatch_request(&new_view, view, request, y, x);
1104 	if (err)
1105 		return err;
1106 
1107 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1108 		err = view_init_hsplit(view, y);
1109 		if (err)
1110 			return err;
1111 	}
1112 
1113 	view->focussed = 0;
1114 	new_view->focussed = 1;
1115 	new_view->mode = view->mode;
1116 	new_view->nlines = view->lines - y;
1117 
1118 	if (view_is_parent_view(view)) {
1119 		view_transfer_size(new_view, view);
1120 		err = view_close_child(view);
1121 		if (err)
1122 			return err;
1123 		err = view_set_child(view, new_view);
1124 		if (err)
1125 			return err;
1126 		view->focus_child = 1;
1127 	} else
1128 		*requested = new_view;
1129 
1130 	return NULL;
1131 }
1132 
1133 static void
1134 tog_resizeterm(void)
1135 {
1136 	int cols, lines;
1137 	struct winsize size;
1138 
1139 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1140 		cols = 80;     /* Default */
1141 		lines = 24;
1142 	} else {
1143 		cols = size.ws_col;
1144 		lines = size.ws_row;
1145 	}
1146 	resize_term(lines, cols);
1147 }
1148 
1149 static const struct got_error *
1150 view_search_start(struct tog_view *view)
1151 {
1152 	const struct got_error *err = NULL;
1153 	struct tog_view *v = view;
1154 	char pattern[1024];
1155 	int ret;
1156 
1157 	if (view->search_started) {
1158 		regfree(&view->regex);
1159 		view->searching = 0;
1160 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1161 	}
1162 	view->search_started = 0;
1163 
1164 	if (view->nlines < 1)
1165 		return NULL;
1166 
1167 	if (view_is_hsplit_top(view))
1168 		v = view->child;
1169 
1170 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1171 	wclrtoeol(v->window);
1172 
1173 	nodelay(view->window, FALSE);  /* block for search term input */
1174 	nocbreak();
1175 	echo();
1176 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1177 	wrefresh(v->window);
1178 	cbreak();
1179 	noecho();
1180 	nodelay(view->window, TRUE);
1181 	if (ret == ERR)
1182 		return NULL;
1183 
1184 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1185 		err = view->search_start(view);
1186 		if (err) {
1187 			regfree(&view->regex);
1188 			return err;
1189 		}
1190 		view->search_started = 1;
1191 		view->searching = TOG_SEARCH_FORWARD;
1192 		view->search_next_done = 0;
1193 		view->search_next(view);
1194 	}
1195 
1196 	return NULL;
1197 }
1198 
1199 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1200 static const struct got_error *
1201 switch_split(struct tog_view *view)
1202 {
1203 	const struct got_error	*err = NULL;
1204 	struct tog_view		*v = NULL;
1205 
1206 	if (view->parent)
1207 		v = view->parent;
1208 	else
1209 		v = view;
1210 
1211 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1212 		v->mode = TOG_VIEW_SPLIT_VERT;
1213 	else
1214 		v->mode = TOG_VIEW_SPLIT_HRZN;
1215 
1216 	if (!v->child)
1217 		return NULL;
1218 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1219 		v->mode = TOG_VIEW_SPLIT_NONE;
1220 
1221 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1222 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1223 		v->child->begin_y = v->child->resized_y;
1224 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1225 		v->child->begin_x = v->child->resized_x;
1226 
1227 
1228 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1229 		v->ncols = COLS;
1230 		v->child->ncols = COLS;
1231 		v->child->nscrolled = LINES - v->child->nlines;
1232 
1233 		err = view_init_hsplit(v, v->child->begin_y);
1234 		if (err)
1235 			return err;
1236 	}
1237 	v->child->mode = v->mode;
1238 	v->child->nlines = v->lines - v->child->begin_y;
1239 	v->focus_child = 1;
1240 
1241 	err = view_fullscreen(v);
1242 	if (err)
1243 		return err;
1244 	err = view_splitscreen(v->child);
1245 	if (err)
1246 		return err;
1247 
1248 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1249 		v->mode = TOG_VIEW_SPLIT_VERT;
1250 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1251 		err = offset_selection_down(v);
1252 		if (err)
1253 			return err;
1254 		err = offset_selection_down(v->child);
1255 		if (err)
1256 			return err;
1257 	} else {
1258 		offset_selection_up(v);
1259 		offset_selection_up(v->child);
1260 	}
1261 	if (v->resize)
1262 		err = v->resize(v, 0);
1263 	else if (v->child->resize)
1264 		err = v->child->resize(v->child, 0);
1265 
1266 	return err;
1267 }
1268 
1269 /*
1270  * Compute view->count from numeric input. Assign total to view->count and
1271  * return first non-numeric key entered.
1272  */
1273 static int
1274 get_compound_key(struct tog_view *view, int c)
1275 {
1276 	struct tog_view	*v = view;
1277 	int		 x, n = 0;
1278 
1279 	if (view_is_hsplit_top(view))
1280 		v = view->child;
1281 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1282 		v = view->parent;
1283 
1284 	view->count = 0;
1285 	cbreak();  /* block for input */
1286 	nodelay(view->window, FALSE);
1287 	wmove(v->window, v->nlines - 1, 0);
1288 	wclrtoeol(v->window);
1289 	waddch(v->window, ':');
1290 
1291 	do {
1292 		x = getcurx(v->window);
1293 		if (x != ERR && x < view->ncols) {
1294 			waddch(v->window, c);
1295 			wrefresh(v->window);
1296 		}
1297 
1298 		/*
1299 		 * Don't overflow. Max valid request should be the greatest
1300 		 * between the longest and total lines; cap at 10 million.
1301 		 */
1302 		if (n >= 9999999)
1303 			n = 9999999;
1304 		else
1305 			n = n * 10 + (c - '0');
1306 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1307 
1308 	if (c == 'G' || c == 'g') {	/* nG key map */
1309 		view->gline = view->hiline = n;
1310 		n = 0;
1311 		c = 0;
1312 	}
1313 
1314 	/* Massage excessive or inapplicable values at the input handler. */
1315 	view->count = n;
1316 
1317 	return c;
1318 }
1319 
1320 static const struct got_error *
1321 view_input(struct tog_view **new, int *done, struct tog_view *view,
1322     struct tog_view_list_head *views)
1323 {
1324 	const struct got_error *err = NULL;
1325 	struct tog_view *v;
1326 	int ch, errcode;
1327 
1328 	*new = NULL;
1329 
1330 	/* Clear "no matches" indicator. */
1331 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1332 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1333 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1334 		view->count = 0;
1335 	}
1336 
1337 	if (view->searching && !view->search_next_done) {
1338 		errcode = pthread_mutex_unlock(&tog_mutex);
1339 		if (errcode)
1340 			return got_error_set_errno(errcode,
1341 			    "pthread_mutex_unlock");
1342 		sched_yield();
1343 		errcode = pthread_mutex_lock(&tog_mutex);
1344 		if (errcode)
1345 			return got_error_set_errno(errcode,
1346 			    "pthread_mutex_lock");
1347 		view->search_next(view);
1348 		return NULL;
1349 	}
1350 
1351 	/* Allow threads to make progress while we are waiting for input. */
1352 	errcode = pthread_mutex_unlock(&tog_mutex);
1353 	if (errcode)
1354 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1355 	/* If we have an unfinished count, let C-g or backspace abort. */
1356 	if (view->count && --view->count) {
1357 		cbreak();
1358 		nodelay(view->window, TRUE);
1359 		ch = wgetch(view->window);
1360 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1361 			view->count = 0;
1362 		else
1363 			ch = view->ch;
1364 	} else {
1365 		ch = wgetch(view->window);
1366 		if (ch >= '1' && ch  <= '9')
1367 			view->ch = ch = get_compound_key(view, ch);
1368 	}
1369 	if (view->hiline && ch != ERR && ch != 0)
1370 		view->hiline = 0;  /* key pressed, clear line highlight */
1371 	nodelay(view->window, TRUE);
1372 	errcode = pthread_mutex_lock(&tog_mutex);
1373 	if (errcode)
1374 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1375 
1376 	if (tog_sigwinch_received || tog_sigcont_received) {
1377 		tog_resizeterm();
1378 		tog_sigwinch_received = 0;
1379 		tog_sigcont_received = 0;
1380 		TAILQ_FOREACH(v, views, entry) {
1381 			err = view_resize(v);
1382 			if (err)
1383 				return err;
1384 			err = v->input(new, v, KEY_RESIZE);
1385 			if (err)
1386 				return err;
1387 			if (v->child) {
1388 				err = view_resize(v->child);
1389 				if (err)
1390 					return err;
1391 				err = v->child->input(new, v->child,
1392 				    KEY_RESIZE);
1393 				if (err)
1394 					return err;
1395 				if (v->child->resized_x || v->child->resized_y) {
1396 					err = view_resize_split(v, 0);
1397 					if (err)
1398 						return err;
1399 				}
1400 			}
1401 		}
1402 	}
1403 
1404 	switch (ch) {
1405 	case '\t':
1406 		view->count = 0;
1407 		if (view->child) {
1408 			view->focussed = 0;
1409 			view->child->focussed = 1;
1410 			view->focus_child = 1;
1411 		} else if (view->parent) {
1412 			view->focussed = 0;
1413 			view->parent->focussed = 1;
1414 			view->parent->focus_child = 0;
1415 			if (!view_is_splitscreen(view)) {
1416 				if (view->parent->resize) {
1417 					err = view->parent->resize(view->parent,
1418 					    0);
1419 					if (err)
1420 						return err;
1421 				}
1422 				offset_selection_up(view->parent);
1423 				err = view_fullscreen(view->parent);
1424 				if (err)
1425 					return err;
1426 			}
1427 		}
1428 		break;
1429 	case 'q':
1430 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1431 			if (view->parent->resize) {
1432 				/* might need more commits to fill fullscreen */
1433 				err = view->parent->resize(view->parent, 0);
1434 				if (err)
1435 					break;
1436 			}
1437 			offset_selection_up(view->parent);
1438 		}
1439 		err = view->input(new, view, ch);
1440 		view->dying = 1;
1441 		break;
1442 	case 'Q':
1443 		*done = 1;
1444 		break;
1445 	case 'F':
1446 		view->count = 0;
1447 		if (view_is_parent_view(view)) {
1448 			if (view->child == NULL)
1449 				break;
1450 			if (view_is_splitscreen(view->child)) {
1451 				view->focussed = 0;
1452 				view->child->focussed = 1;
1453 				err = view_fullscreen(view->child);
1454 			} else {
1455 				err = view_splitscreen(view->child);
1456 				if (!err)
1457 					err = view_resize_split(view, 0);
1458 			}
1459 			if (err)
1460 				break;
1461 			err = view->child->input(new, view->child,
1462 			    KEY_RESIZE);
1463 		} else {
1464 			if (view_is_splitscreen(view)) {
1465 				view->parent->focussed = 0;
1466 				view->focussed = 1;
1467 				err = view_fullscreen(view);
1468 			} else {
1469 				err = view_splitscreen(view);
1470 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1471 					err = view_resize(view->parent);
1472 				if (!err)
1473 					err = view_resize_split(view, 0);
1474 			}
1475 			if (err)
1476 				break;
1477 			err = view->input(new, view, KEY_RESIZE);
1478 		}
1479 		if (err)
1480 			break;
1481 		if (view->resize) {
1482 			err = view->resize(view, 0);
1483 			if (err)
1484 				break;
1485 		}
1486 		if (view->parent)
1487 			err = offset_selection_down(view->parent);
1488 		if (!err)
1489 			err = offset_selection_down(view);
1490 		break;
1491 	case 'S':
1492 		view->count = 0;
1493 		err = switch_split(view);
1494 		break;
1495 	case '-':
1496 		err = view_resize_split(view, -1);
1497 		break;
1498 	case '+':
1499 		err = view_resize_split(view, 1);
1500 		break;
1501 	case KEY_RESIZE:
1502 		break;
1503 	case '/':
1504 		view->count = 0;
1505 		if (view->search_start)
1506 			view_search_start(view);
1507 		else
1508 			err = view->input(new, view, ch);
1509 		break;
1510 	case 'N':
1511 	case 'n':
1512 		if (view->search_started && view->search_next) {
1513 			view->searching = (ch == 'n' ?
1514 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1515 			view->search_next_done = 0;
1516 			view->search_next(view);
1517 		} else
1518 			err = view->input(new, view, ch);
1519 		break;
1520 	case 'A':
1521 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1522 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1523 		else
1524 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1525 		TAILQ_FOREACH(v, views, entry) {
1526 			if (v->reset) {
1527 				err = v->reset(v);
1528 				if (err)
1529 					return err;
1530 			}
1531 			if (v->child && v->child->reset) {
1532 				err = v->child->reset(v->child);
1533 				if (err)
1534 					return err;
1535 			}
1536 		}
1537 		break;
1538 	default:
1539 		err = view->input(new, view, ch);
1540 		break;
1541 	}
1542 
1543 	return err;
1544 }
1545 
1546 static int
1547 view_needs_focus_indication(struct tog_view *view)
1548 {
1549 	if (view_is_parent_view(view)) {
1550 		if (view->child == NULL || view->child->focussed)
1551 			return 0;
1552 		if (!view_is_splitscreen(view->child))
1553 			return 0;
1554 	} else if (!view_is_splitscreen(view))
1555 		return 0;
1556 
1557 	return view->focussed;
1558 }
1559 
1560 static const struct got_error *
1561 view_loop(struct tog_view *view)
1562 {
1563 	const struct got_error *err = NULL;
1564 	struct tog_view_list_head views;
1565 	struct tog_view *new_view;
1566 	char *mode;
1567 	int fast_refresh = 10;
1568 	int done = 0, errcode;
1569 
1570 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1571 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1572 		view->mode = TOG_VIEW_SPLIT_VERT;
1573 	else
1574 		view->mode = TOG_VIEW_SPLIT_HRZN;
1575 
1576 	errcode = pthread_mutex_lock(&tog_mutex);
1577 	if (errcode)
1578 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1579 
1580 	TAILQ_INIT(&views);
1581 	TAILQ_INSERT_HEAD(&views, view, entry);
1582 
1583 	view->focussed = 1;
1584 	err = view->show(view);
1585 	if (err)
1586 		return err;
1587 	update_panels();
1588 	doupdate();
1589 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1590 	    !tog_fatal_signal_received()) {
1591 		/* Refresh fast during initialization, then become slower. */
1592 		if (fast_refresh && fast_refresh-- == 0)
1593 			halfdelay(10); /* switch to once per second */
1594 
1595 		err = view_input(&new_view, &done, view, &views);
1596 		if (err)
1597 			break;
1598 		if (view->dying) {
1599 			struct tog_view *v, *prev = NULL;
1600 
1601 			if (view_is_parent_view(view))
1602 				prev = TAILQ_PREV(view, tog_view_list_head,
1603 				    entry);
1604 			else if (view->parent)
1605 				prev = view->parent;
1606 
1607 			if (view->parent) {
1608 				view->parent->child = NULL;
1609 				view->parent->focus_child = 0;
1610 				/* Restore fullscreen line height. */
1611 				view->parent->nlines = view->parent->lines;
1612 				err = view_resize(view->parent);
1613 				if (err)
1614 					break;
1615 				/* Make resized splits persist. */
1616 				view_transfer_size(view->parent, view);
1617 			} else
1618 				TAILQ_REMOVE(&views, view, entry);
1619 
1620 			err = view_close(view);
1621 			if (err)
1622 				goto done;
1623 
1624 			view = NULL;
1625 			TAILQ_FOREACH(v, &views, entry) {
1626 				if (v->focussed)
1627 					break;
1628 			}
1629 			if (view == NULL && new_view == NULL) {
1630 				/* No view has focus. Try to pick one. */
1631 				if (prev)
1632 					view = prev;
1633 				else if (!TAILQ_EMPTY(&views)) {
1634 					view = TAILQ_LAST(&views,
1635 					    tog_view_list_head);
1636 				}
1637 				if (view) {
1638 					if (view->focus_child) {
1639 						view->child->focussed = 1;
1640 						view = view->child;
1641 					} else
1642 						view->focussed = 1;
1643 				}
1644 			}
1645 		}
1646 		if (new_view) {
1647 			struct tog_view *v, *t;
1648 			/* Only allow one parent view per type. */
1649 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1650 				if (v->type != new_view->type)
1651 					continue;
1652 				TAILQ_REMOVE(&views, v, entry);
1653 				err = view_close(v);
1654 				if (err)
1655 					goto done;
1656 				break;
1657 			}
1658 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1659 			view = new_view;
1660 		}
1661 		if (view) {
1662 			if (view_is_parent_view(view)) {
1663 				if (view->child && view->child->focussed)
1664 					view = view->child;
1665 			} else {
1666 				if (view->parent && view->parent->focussed)
1667 					view = view->parent;
1668 			}
1669 			show_panel(view->panel);
1670 			if (view->child && view_is_splitscreen(view->child))
1671 				show_panel(view->child->panel);
1672 			if (view->parent && view_is_splitscreen(view)) {
1673 				err = view->parent->show(view->parent);
1674 				if (err)
1675 					goto done;
1676 			}
1677 			err = view->show(view);
1678 			if (err)
1679 				goto done;
1680 			if (view->child) {
1681 				err = view->child->show(view->child);
1682 				if (err)
1683 					goto done;
1684 			}
1685 			update_panels();
1686 			doupdate();
1687 		}
1688 	}
1689 done:
1690 	while (!TAILQ_EMPTY(&views)) {
1691 		const struct got_error *close_err;
1692 		view = TAILQ_FIRST(&views);
1693 		TAILQ_REMOVE(&views, view, entry);
1694 		close_err = view_close(view);
1695 		if (close_err && err == NULL)
1696 			err = close_err;
1697 	}
1698 
1699 	errcode = pthread_mutex_unlock(&tog_mutex);
1700 	if (errcode && err == NULL)
1701 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1702 
1703 	return err;
1704 }
1705 
1706 __dead static void
1707 usage_log(void)
1708 {
1709 	endwin();
1710 	fprintf(stderr,
1711 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1712 	    getprogname());
1713 	exit(1);
1714 }
1715 
1716 /* Create newly allocated wide-character string equivalent to a byte string. */
1717 static const struct got_error *
1718 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1719 {
1720 	char *vis = NULL;
1721 	const struct got_error *err = NULL;
1722 
1723 	*ws = NULL;
1724 	*wlen = mbstowcs(NULL, s, 0);
1725 	if (*wlen == (size_t)-1) {
1726 		int vislen;
1727 		if (errno != EILSEQ)
1728 			return got_error_from_errno("mbstowcs");
1729 
1730 		/* byte string invalid in current encoding; try to "fix" it */
1731 		err = got_mbsavis(&vis, &vislen, s);
1732 		if (err)
1733 			return err;
1734 		*wlen = mbstowcs(NULL, vis, 0);
1735 		if (*wlen == (size_t)-1) {
1736 			err = got_error_from_errno("mbstowcs"); /* give up */
1737 			goto done;
1738 		}
1739 	}
1740 
1741 	*ws = calloc(*wlen + 1, sizeof(**ws));
1742 	if (*ws == NULL) {
1743 		err = got_error_from_errno("calloc");
1744 		goto done;
1745 	}
1746 
1747 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1748 		err = got_error_from_errno("mbstowcs");
1749 done:
1750 	free(vis);
1751 	if (err) {
1752 		free(*ws);
1753 		*ws = NULL;
1754 		*wlen = 0;
1755 	}
1756 	return err;
1757 }
1758 
1759 static const struct got_error *
1760 expand_tab(char **ptr, const char *src)
1761 {
1762 	char	*dst;
1763 	size_t	 len, n, idx = 0, sz = 0;
1764 
1765 	*ptr = NULL;
1766 	n = len = strlen(src);
1767 	dst = malloc(n + 1);
1768 	if (dst == NULL)
1769 		return got_error_from_errno("malloc");
1770 
1771 	while (idx < len && src[idx]) {
1772 		const char c = src[idx];
1773 
1774 		if (c == '\t') {
1775 			size_t nb = TABSIZE - sz % TABSIZE;
1776 			char *p;
1777 
1778 			p = realloc(dst, n + nb);
1779 			if (p == NULL) {
1780 				free(dst);
1781 				return got_error_from_errno("realloc");
1782 
1783 			}
1784 			dst = p;
1785 			n += nb;
1786 			memset(dst + sz, ' ', nb);
1787 			sz += nb;
1788 		} else
1789 			dst[sz++] = src[idx];
1790 		++idx;
1791 	}
1792 
1793 	dst[sz] = '\0';
1794 	*ptr = dst;
1795 	return NULL;
1796 }
1797 
1798 /*
1799  * Advance at most n columns from wline starting at offset off.
1800  * Return the index to the first character after the span operation.
1801  * Return the combined column width of all spanned wide character in
1802  * *rcol.
1803  */
1804 static int
1805 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1806 {
1807 	int width, i, cols = 0;
1808 
1809 	if (n == 0) {
1810 		*rcol = cols;
1811 		return off;
1812 	}
1813 
1814 	for (i = off; wline[i] != L'\0'; ++i) {
1815 		if (wline[i] == L'\t')
1816 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1817 		else
1818 			width = wcwidth(wline[i]);
1819 
1820 		if (width == -1) {
1821 			width = 1;
1822 			wline[i] = L'.';
1823 		}
1824 
1825 		if (cols + width > n)
1826 			break;
1827 		cols += width;
1828 	}
1829 
1830 	*rcol = cols;
1831 	return i;
1832 }
1833 
1834 /*
1835  * Format a line for display, ensuring that it won't overflow a width limit.
1836  * With scrolling, the width returned refers to the scrolled version of the
1837  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1838  */
1839 static const struct got_error *
1840 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1841     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1842 {
1843 	const struct got_error *err = NULL;
1844 	int cols;
1845 	wchar_t *wline = NULL;
1846 	char *exstr = NULL;
1847 	size_t wlen;
1848 	int i, scrollx;
1849 
1850 	*wlinep = NULL;
1851 	*widthp = 0;
1852 
1853 	if (expand) {
1854 		err = expand_tab(&exstr, line);
1855 		if (err)
1856 			return err;
1857 	}
1858 
1859 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1860 	free(exstr);
1861 	if (err)
1862 		return err;
1863 
1864 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1865 
1866 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1867 		wline[wlen - 1] = L'\0';
1868 		wlen--;
1869 	}
1870 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1871 		wline[wlen - 1] = L'\0';
1872 		wlen--;
1873 	}
1874 
1875 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1876 	wline[i] = L'\0';
1877 
1878 	if (widthp)
1879 		*widthp = cols;
1880 	if (scrollxp)
1881 		*scrollxp = scrollx;
1882 	if (err)
1883 		free(wline);
1884 	else
1885 		*wlinep = wline;
1886 	return err;
1887 }
1888 
1889 static const struct got_error*
1890 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1891     struct got_object_id *id, struct got_repository *repo)
1892 {
1893 	static const struct got_error *err = NULL;
1894 	struct got_reflist_entry *re;
1895 	char *s;
1896 	const char *name;
1897 
1898 	*refs_str = NULL;
1899 
1900 	TAILQ_FOREACH(re, refs, entry) {
1901 		struct got_tag_object *tag = NULL;
1902 		struct got_object_id *ref_id;
1903 		int cmp;
1904 
1905 		name = got_ref_get_name(re->ref);
1906 		if (strcmp(name, GOT_REF_HEAD) == 0)
1907 			continue;
1908 		if (strncmp(name, "refs/", 5) == 0)
1909 			name += 5;
1910 		if (strncmp(name, "got/", 4) == 0 &&
1911 		    strncmp(name, "got/backup/", 11) != 0)
1912 			continue;
1913 		if (strncmp(name, "heads/", 6) == 0)
1914 			name += 6;
1915 		if (strncmp(name, "remotes/", 8) == 0) {
1916 			name += 8;
1917 			s = strstr(name, "/" GOT_REF_HEAD);
1918 			if (s != NULL && s[strlen(s)] == '\0')
1919 				continue;
1920 		}
1921 		err = got_ref_resolve(&ref_id, repo, re->ref);
1922 		if (err)
1923 			break;
1924 		if (strncmp(name, "tags/", 5) == 0) {
1925 			err = got_object_open_as_tag(&tag, repo, ref_id);
1926 			if (err) {
1927 				if (err->code != GOT_ERR_OBJ_TYPE) {
1928 					free(ref_id);
1929 					break;
1930 				}
1931 				/* Ref points at something other than a tag. */
1932 				err = NULL;
1933 				tag = NULL;
1934 			}
1935 		}
1936 		cmp = got_object_id_cmp(tag ?
1937 		    got_object_tag_get_object_id(tag) : ref_id, id);
1938 		free(ref_id);
1939 		if (tag)
1940 			got_object_tag_close(tag);
1941 		if (cmp != 0)
1942 			continue;
1943 		s = *refs_str;
1944 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1945 		    s ? ", " : "", name) == -1) {
1946 			err = got_error_from_errno("asprintf");
1947 			free(s);
1948 			*refs_str = NULL;
1949 			break;
1950 		}
1951 		free(s);
1952 	}
1953 
1954 	return err;
1955 }
1956 
1957 static const struct got_error *
1958 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1959     int col_tab_align)
1960 {
1961 	char *smallerthan;
1962 
1963 	smallerthan = strchr(author, '<');
1964 	if (smallerthan && smallerthan[1] != '\0')
1965 		author = smallerthan + 1;
1966 	author[strcspn(author, "@>")] = '\0';
1967 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1968 	    col_tab_align, 0);
1969 }
1970 
1971 static const struct got_error *
1972 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1973     struct got_object_id *id, const size_t date_display_cols,
1974     int author_display_cols)
1975 {
1976 	struct tog_log_view_state *s = &view->state.log;
1977 	const struct got_error *err = NULL;
1978 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1979 	char *logmsg0 = NULL, *logmsg = NULL;
1980 	char *author = NULL;
1981 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1982 	int author_width, logmsg_width;
1983 	char *newline, *line = NULL;
1984 	int col, limit, scrollx;
1985 	const int avail = view->ncols;
1986 	struct tm tm;
1987 	time_t committer_time;
1988 	struct tog_color *tc;
1989 
1990 	committer_time = got_object_commit_get_committer_time(commit);
1991 	if (gmtime_r(&committer_time, &tm) == NULL)
1992 		return got_error_from_errno("gmtime_r");
1993 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
1994 		return got_error(GOT_ERR_NO_SPACE);
1995 
1996 	if (avail <= date_display_cols)
1997 		limit = MIN(sizeof(datebuf) - 1, avail);
1998 	else
1999 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2000 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2001 	if (tc)
2002 		wattr_on(view->window,
2003 		    COLOR_PAIR(tc->colorpair), NULL);
2004 	waddnstr(view->window, datebuf, limit);
2005 	if (tc)
2006 		wattr_off(view->window,
2007 		    COLOR_PAIR(tc->colorpair), NULL);
2008 	col = limit;
2009 	if (col > avail)
2010 		goto done;
2011 
2012 	if (avail >= 120) {
2013 		char *id_str;
2014 		err = got_object_id_str(&id_str, id);
2015 		if (err)
2016 			goto done;
2017 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2018 		if (tc)
2019 			wattr_on(view->window,
2020 			    COLOR_PAIR(tc->colorpair), NULL);
2021 		wprintw(view->window, "%.8s ", id_str);
2022 		if (tc)
2023 			wattr_off(view->window,
2024 			    COLOR_PAIR(tc->colorpair), NULL);
2025 		free(id_str);
2026 		col += 9;
2027 		if (col > avail)
2028 			goto done;
2029 	}
2030 
2031 	if (s->use_committer)
2032 		author = strdup(got_object_commit_get_committer(commit));
2033 	else
2034 		author = strdup(got_object_commit_get_author(commit));
2035 	if (author == NULL) {
2036 		err = got_error_from_errno("strdup");
2037 		goto done;
2038 	}
2039 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2040 	if (err)
2041 		goto done;
2042 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2043 	if (tc)
2044 		wattr_on(view->window,
2045 		    COLOR_PAIR(tc->colorpair), NULL);
2046 	waddwstr(view->window, wauthor);
2047 	col += author_width;
2048 	while (col < avail && author_width < author_display_cols + 2) {
2049 		waddch(view->window, ' ');
2050 		col++;
2051 		author_width++;
2052 	}
2053 	if (tc)
2054 		wattr_off(view->window,
2055 		    COLOR_PAIR(tc->colorpair), NULL);
2056 	if (col > avail)
2057 		goto done;
2058 
2059 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2060 	if (err)
2061 		goto done;
2062 	logmsg = logmsg0;
2063 	while (*logmsg == '\n')
2064 		logmsg++;
2065 	newline = strchr(logmsg, '\n');
2066 	if (newline)
2067 		*newline = '\0';
2068 	limit = avail - col;
2069 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2070 		limit--;	/* for the border */
2071 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2072 	    limit, col, 1);
2073 	if (err)
2074 		goto done;
2075 	waddwstr(view->window, &wlogmsg[scrollx]);
2076 	col += MAX(logmsg_width, 0);
2077 	while (col < avail) {
2078 		waddch(view->window, ' ');
2079 		col++;
2080 	}
2081 done:
2082 	free(logmsg0);
2083 	free(wlogmsg);
2084 	free(author);
2085 	free(wauthor);
2086 	free(line);
2087 	return err;
2088 }
2089 
2090 static struct commit_queue_entry *
2091 alloc_commit_queue_entry(struct got_commit_object *commit,
2092     struct got_object_id *id)
2093 {
2094 	struct commit_queue_entry *entry;
2095 	struct got_object_id *dup;
2096 
2097 	entry = calloc(1, sizeof(*entry));
2098 	if (entry == NULL)
2099 		return NULL;
2100 
2101 	dup = got_object_id_dup(id);
2102 	if (dup == NULL) {
2103 		free(entry);
2104 		return NULL;
2105 	}
2106 
2107 	entry->id = dup;
2108 	entry->commit = commit;
2109 	return entry;
2110 }
2111 
2112 static void
2113 pop_commit(struct commit_queue *commits)
2114 {
2115 	struct commit_queue_entry *entry;
2116 
2117 	entry = TAILQ_FIRST(&commits->head);
2118 	TAILQ_REMOVE(&commits->head, entry, entry);
2119 	got_object_commit_close(entry->commit);
2120 	commits->ncommits--;
2121 	free(entry->id);
2122 	free(entry);
2123 }
2124 
2125 static void
2126 free_commits(struct commit_queue *commits)
2127 {
2128 	while (!TAILQ_EMPTY(&commits->head))
2129 		pop_commit(commits);
2130 }
2131 
2132 static const struct got_error *
2133 match_commit(int *have_match, struct got_object_id *id,
2134     struct got_commit_object *commit, regex_t *regex)
2135 {
2136 	const struct got_error *err = NULL;
2137 	regmatch_t regmatch;
2138 	char *id_str = NULL, *logmsg = NULL;
2139 
2140 	*have_match = 0;
2141 
2142 	err = got_object_id_str(&id_str, id);
2143 	if (err)
2144 		return err;
2145 
2146 	err = got_object_commit_get_logmsg(&logmsg, commit);
2147 	if (err)
2148 		goto done;
2149 
2150 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2151 	    &regmatch, 0) == 0 ||
2152 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2153 	    &regmatch, 0) == 0 ||
2154 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2155 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2156 		*have_match = 1;
2157 done:
2158 	free(id_str);
2159 	free(logmsg);
2160 	return err;
2161 }
2162 
2163 static const struct got_error *
2164 queue_commits(struct tog_log_thread_args *a)
2165 {
2166 	const struct got_error *err = NULL;
2167 
2168 	/*
2169 	 * We keep all commits open throughout the lifetime of the log
2170 	 * view in order to avoid having to re-fetch commits from disk
2171 	 * while updating the display.
2172 	 */
2173 	do {
2174 		struct got_object_id *id;
2175 		struct got_commit_object *commit;
2176 		struct commit_queue_entry *entry;
2177 		int errcode;
2178 
2179 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2180 		    NULL, NULL);
2181 		if (err || id == NULL)
2182 			break;
2183 
2184 		err = got_object_open_as_commit(&commit, a->repo, id);
2185 		if (err)
2186 			break;
2187 		entry = alloc_commit_queue_entry(commit, id);
2188 		if (entry == NULL) {
2189 			err = got_error_from_errno("alloc_commit_queue_entry");
2190 			break;
2191 		}
2192 
2193 		errcode = pthread_mutex_lock(&tog_mutex);
2194 		if (errcode) {
2195 			err = got_error_set_errno(errcode,
2196 			    "pthread_mutex_lock");
2197 			break;
2198 		}
2199 
2200 		entry->idx = a->commits->ncommits;
2201 		TAILQ_INSERT_TAIL(&a->commits->head, entry, entry);
2202 		a->commits->ncommits++;
2203 
2204 		if (*a->searching == TOG_SEARCH_FORWARD &&
2205 		    !*a->search_next_done) {
2206 			int have_match;
2207 			err = match_commit(&have_match, id, commit, a->regex);
2208 			if (err)
2209 				break;
2210 			if (have_match)
2211 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2212 		}
2213 
2214 		errcode = pthread_mutex_unlock(&tog_mutex);
2215 		if (errcode && err == NULL)
2216 			err = got_error_set_errno(errcode,
2217 			    "pthread_mutex_unlock");
2218 		if (err)
2219 			break;
2220 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2221 
2222 	return err;
2223 }
2224 
2225 static void
2226 select_commit(struct tog_log_view_state *s)
2227 {
2228 	struct commit_queue_entry *entry;
2229 	int ncommits = 0;
2230 
2231 	entry = s->first_displayed_entry;
2232 	while (entry) {
2233 		if (ncommits == s->selected) {
2234 			s->selected_entry = entry;
2235 			break;
2236 		}
2237 		entry = TAILQ_NEXT(entry, entry);
2238 		ncommits++;
2239 	}
2240 }
2241 
2242 static const struct got_error *
2243 draw_commits(struct tog_view *view)
2244 {
2245 	const struct got_error *err = NULL;
2246 	struct tog_log_view_state *s = &view->state.log;
2247 	struct commit_queue_entry *entry = s->selected_entry;
2248 	int limit = view->nlines;
2249 	int width;
2250 	int ncommits, author_cols = 4;
2251 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2252 	char *refs_str = NULL;
2253 	wchar_t *wline;
2254 	struct tog_color *tc;
2255 	static const size_t date_display_cols = 12;
2256 
2257 	if (view_is_hsplit_top(view))
2258 		--limit;  /* account for border */
2259 
2260 	if (s->selected_entry &&
2261 	    !(view->searching && view->search_next_done == 0)) {
2262 		struct got_reflist_head *refs;
2263 		err = got_object_id_str(&id_str, s->selected_entry->id);
2264 		if (err)
2265 			return err;
2266 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2267 		    s->selected_entry->id);
2268 		if (refs) {
2269 			err = build_refs_str(&refs_str, refs,
2270 			    s->selected_entry->id, s->repo);
2271 			if (err)
2272 				goto done;
2273 		}
2274 	}
2275 
2276 	if (s->thread_args.commits_needed == 0)
2277 		halfdelay(10); /* disable fast refresh */
2278 
2279 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2280 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2281 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2282 		    (view->searching && !view->search_next_done) ?
2283 		    "searching..." : "loading...") == -1) {
2284 			err = got_error_from_errno("asprintf");
2285 			goto done;
2286 		}
2287 	} else {
2288 		const char *search_str = NULL;
2289 
2290 		if (view->searching) {
2291 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2292 				search_str = "no more matches";
2293 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2294 				search_str = "no matches found";
2295 			else if (!view->search_next_done)
2296 				search_str = "searching...";
2297 		}
2298 
2299 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2300 		    entry ? entry->idx + 1 : 0, s->commits.ncommits,
2301 		    search_str ? search_str :
2302 		    (refs_str ? refs_str : "")) == -1) {
2303 			err = got_error_from_errno("asprintf");
2304 			goto done;
2305 		}
2306 	}
2307 
2308 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2309 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2310 		    "........................................",
2311 		    s->in_repo_path, ncommits_str) == -1) {
2312 			err = got_error_from_errno("asprintf");
2313 			header = NULL;
2314 			goto done;
2315 		}
2316 	} else if (asprintf(&header, "commit %s%s",
2317 	    id_str ? id_str : "........................................",
2318 	    ncommits_str) == -1) {
2319 		err = got_error_from_errno("asprintf");
2320 		header = NULL;
2321 		goto done;
2322 	}
2323 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2324 	if (err)
2325 		goto done;
2326 
2327 	werase(view->window);
2328 
2329 	if (view_needs_focus_indication(view))
2330 		wstandout(view->window);
2331 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2332 	if (tc)
2333 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2334 	waddwstr(view->window, wline);
2335 	while (width < view->ncols) {
2336 		waddch(view->window, ' ');
2337 		width++;
2338 	}
2339 	if (tc)
2340 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2341 	if (view_needs_focus_indication(view))
2342 		wstandend(view->window);
2343 	free(wline);
2344 	if (limit <= 1)
2345 		goto done;
2346 
2347 	/* Grow author column size if necessary, and set view->maxx. */
2348 	entry = s->first_displayed_entry;
2349 	ncommits = 0;
2350 	view->maxx = 0;
2351 	while (entry) {
2352 		struct got_commit_object *c = entry->commit;
2353 		char *author, *eol, *msg, *msg0;
2354 		wchar_t *wauthor, *wmsg;
2355 		int width;
2356 		if (ncommits >= limit - 1)
2357 			break;
2358 		if (s->use_committer)
2359 			author = strdup(got_object_commit_get_committer(c));
2360 		else
2361 			author = strdup(got_object_commit_get_author(c));
2362 		if (author == NULL) {
2363 			err = got_error_from_errno("strdup");
2364 			goto done;
2365 		}
2366 		err = format_author(&wauthor, &width, author, COLS,
2367 		    date_display_cols);
2368 		if (author_cols < width)
2369 			author_cols = width;
2370 		free(wauthor);
2371 		free(author);
2372 		if (err)
2373 			goto done;
2374 		err = got_object_commit_get_logmsg(&msg0, c);
2375 		if (err)
2376 			goto done;
2377 		msg = msg0;
2378 		while (*msg == '\n')
2379 			++msg;
2380 		if ((eol = strchr(msg, '\n')))
2381 			*eol = '\0';
2382 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2383 		    date_display_cols + author_cols, 0);
2384 		if (err)
2385 			goto done;
2386 		view->maxx = MAX(view->maxx, width);
2387 		free(msg0);
2388 		free(wmsg);
2389 		ncommits++;
2390 		entry = TAILQ_NEXT(entry, entry);
2391 	}
2392 
2393 	entry = s->first_displayed_entry;
2394 	s->last_displayed_entry = s->first_displayed_entry;
2395 	ncommits = 0;
2396 	while (entry) {
2397 		if (ncommits >= limit - 1)
2398 			break;
2399 		if (ncommits == s->selected)
2400 			wstandout(view->window);
2401 		err = draw_commit(view, entry->commit, entry->id,
2402 		    date_display_cols, author_cols);
2403 		if (ncommits == s->selected)
2404 			wstandend(view->window);
2405 		if (err)
2406 			goto done;
2407 		ncommits++;
2408 		s->last_displayed_entry = entry;
2409 		entry = TAILQ_NEXT(entry, entry);
2410 	}
2411 
2412 	view_border(view);
2413 done:
2414 	free(id_str);
2415 	free(refs_str);
2416 	free(ncommits_str);
2417 	free(header);
2418 	return err;
2419 }
2420 
2421 static void
2422 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2423 {
2424 	struct commit_queue_entry *entry;
2425 	int nscrolled = 0;
2426 
2427 	entry = TAILQ_FIRST(&s->commits.head);
2428 	if (s->first_displayed_entry == entry)
2429 		return;
2430 
2431 	entry = s->first_displayed_entry;
2432 	while (entry && nscrolled < maxscroll) {
2433 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2434 		if (entry) {
2435 			s->first_displayed_entry = entry;
2436 			nscrolled++;
2437 		}
2438 	}
2439 }
2440 
2441 static const struct got_error *
2442 trigger_log_thread(struct tog_view *view, int wait)
2443 {
2444 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2445 	int errcode;
2446 
2447 	halfdelay(1); /* fast refresh while loading commits */
2448 
2449 	while (!ta->log_complete && !tog_thread_error &&
2450 	    (ta->commits_needed > 0 || ta->load_all)) {
2451 		/* Wake the log thread. */
2452 		errcode = pthread_cond_signal(&ta->need_commits);
2453 		if (errcode)
2454 			return got_error_set_errno(errcode,
2455 			    "pthread_cond_signal");
2456 
2457 		/*
2458 		 * The mutex will be released while the view loop waits
2459 		 * in wgetch(), at which time the log thread will run.
2460 		 */
2461 		if (!wait)
2462 			break;
2463 
2464 		/* Display progress update in log view. */
2465 		show_log_view(view);
2466 		update_panels();
2467 		doupdate();
2468 
2469 		/* Wait right here while next commit is being loaded. */
2470 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2471 		if (errcode)
2472 			return got_error_set_errno(errcode,
2473 			    "pthread_cond_wait");
2474 
2475 		/* Display progress update in log view. */
2476 		show_log_view(view);
2477 		update_panels();
2478 		doupdate();
2479 	}
2480 
2481 	return NULL;
2482 }
2483 
2484 static const struct got_error *
2485 request_log_commits(struct tog_view *view)
2486 {
2487 	struct tog_log_view_state	*state = &view->state.log;
2488 	const struct got_error		*err = NULL;
2489 
2490 	if (state->thread_args.log_complete)
2491 		return NULL;
2492 
2493 	state->thread_args.commits_needed += view->nscrolled;
2494 	err = trigger_log_thread(view, 1);
2495 	view->nscrolled = 0;
2496 
2497 	return err;
2498 }
2499 
2500 static const struct got_error *
2501 log_scroll_down(struct tog_view *view, int maxscroll)
2502 {
2503 	struct tog_log_view_state *s = &view->state.log;
2504 	const struct got_error *err = NULL;
2505 	struct commit_queue_entry *pentry;
2506 	int nscrolled = 0, ncommits_needed;
2507 
2508 	if (s->last_displayed_entry == NULL)
2509 		return NULL;
2510 
2511 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2512 	if (s->commits.ncommits < ncommits_needed &&
2513 	    !s->thread_args.log_complete) {
2514 		/*
2515 		 * Ask the log thread for required amount of commits.
2516 		 */
2517 		s->thread_args.commits_needed +=
2518 		    ncommits_needed - s->commits.ncommits;
2519 		err = trigger_log_thread(view, 1);
2520 		if (err)
2521 			return err;
2522 	}
2523 
2524 	do {
2525 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2526 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2527 			break;
2528 
2529 		s->last_displayed_entry = pentry ?
2530 		    pentry : s->last_displayed_entry;;
2531 
2532 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2533 		if (pentry == NULL)
2534 			break;
2535 		s->first_displayed_entry = pentry;
2536 	} while (++nscrolled < maxscroll);
2537 
2538 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2539 		view->nscrolled += nscrolled;
2540 	else
2541 		view->nscrolled = 0;
2542 
2543 	return err;
2544 }
2545 
2546 static const struct got_error *
2547 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2548     struct got_commit_object *commit, struct got_object_id *commit_id,
2549     struct tog_view *log_view, struct got_repository *repo)
2550 {
2551 	const struct got_error *err;
2552 	struct got_object_qid *parent_id;
2553 	struct tog_view *diff_view;
2554 
2555 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2556 	if (diff_view == NULL)
2557 		return got_error_from_errno("view_open");
2558 
2559 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2560 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2561 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2562 	if (err == NULL)
2563 		*new_view = diff_view;
2564 	return err;
2565 }
2566 
2567 static const struct got_error *
2568 tree_view_visit_subtree(struct tog_tree_view_state *s,
2569     struct got_tree_object *subtree)
2570 {
2571 	struct tog_parent_tree *parent;
2572 
2573 	parent = calloc(1, sizeof(*parent));
2574 	if (parent == NULL)
2575 		return got_error_from_errno("calloc");
2576 
2577 	parent->tree = s->tree;
2578 	parent->first_displayed_entry = s->first_displayed_entry;
2579 	parent->selected_entry = s->selected_entry;
2580 	parent->selected = s->selected;
2581 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2582 	s->tree = subtree;
2583 	s->selected = 0;
2584 	s->first_displayed_entry = NULL;
2585 	return NULL;
2586 }
2587 
2588 static const struct got_error *
2589 tree_view_walk_path(struct tog_tree_view_state *s,
2590     struct got_commit_object *commit, const char *path)
2591 {
2592 	const struct got_error *err = NULL;
2593 	struct got_tree_object *tree = NULL;
2594 	const char *p;
2595 	char *slash, *subpath = NULL;
2596 
2597 	/* Walk the path and open corresponding tree objects. */
2598 	p = path;
2599 	while (*p) {
2600 		struct got_tree_entry *te;
2601 		struct got_object_id *tree_id;
2602 		char *te_name;
2603 
2604 		while (p[0] == '/')
2605 			p++;
2606 
2607 		/* Ensure the correct subtree entry is selected. */
2608 		slash = strchr(p, '/');
2609 		if (slash == NULL)
2610 			te_name = strdup(p);
2611 		else
2612 			te_name = strndup(p, slash - p);
2613 		if (te_name == NULL) {
2614 			err = got_error_from_errno("strndup");
2615 			break;
2616 		}
2617 		te = got_object_tree_find_entry(s->tree, te_name);
2618 		if (te == NULL) {
2619 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2620 			free(te_name);
2621 			break;
2622 		}
2623 		free(te_name);
2624 		s->first_displayed_entry = s->selected_entry = te;
2625 
2626 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2627 			break; /* jump to this file's entry */
2628 
2629 		slash = strchr(p, '/');
2630 		if (slash)
2631 			subpath = strndup(path, slash - path);
2632 		else
2633 			subpath = strdup(path);
2634 		if (subpath == NULL) {
2635 			err = got_error_from_errno("strdup");
2636 			break;
2637 		}
2638 
2639 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2640 		    subpath);
2641 		if (err)
2642 			break;
2643 
2644 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2645 		free(tree_id);
2646 		if (err)
2647 			break;
2648 
2649 		err = tree_view_visit_subtree(s, tree);
2650 		if (err) {
2651 			got_object_tree_close(tree);
2652 			break;
2653 		}
2654 		if (slash == NULL)
2655 			break;
2656 		free(subpath);
2657 		subpath = NULL;
2658 		p = slash;
2659 	}
2660 
2661 	free(subpath);
2662 	return err;
2663 }
2664 
2665 static const struct got_error *
2666 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2667     struct commit_queue_entry *entry, const char *path,
2668     const char *head_ref_name, struct got_repository *repo)
2669 {
2670 	const struct got_error *err = NULL;
2671 	struct tog_tree_view_state *s;
2672 	struct tog_view *tree_view;
2673 
2674 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2675 	if (tree_view == NULL)
2676 		return got_error_from_errno("view_open");
2677 
2678 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2679 	if (err)
2680 		return err;
2681 	s = &tree_view->state.tree;
2682 
2683 	*new_view = tree_view;
2684 
2685 	if (got_path_is_root_dir(path))
2686 		return NULL;
2687 
2688 	return tree_view_walk_path(s, entry->commit, path);
2689 }
2690 
2691 static const struct got_error *
2692 block_signals_used_by_main_thread(void)
2693 {
2694 	sigset_t sigset;
2695 	int errcode;
2696 
2697 	if (sigemptyset(&sigset) == -1)
2698 		return got_error_from_errno("sigemptyset");
2699 
2700 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2701 	if (sigaddset(&sigset, SIGWINCH) == -1)
2702 		return got_error_from_errno("sigaddset");
2703 	if (sigaddset(&sigset, SIGCONT) == -1)
2704 		return got_error_from_errno("sigaddset");
2705 	if (sigaddset(&sigset, SIGINT) == -1)
2706 		return got_error_from_errno("sigaddset");
2707 	if (sigaddset(&sigset, SIGTERM) == -1)
2708 		return got_error_from_errno("sigaddset");
2709 
2710 	/* ncurses handles SIGTSTP */
2711 	if (sigaddset(&sigset, SIGTSTP) == -1)
2712 		return got_error_from_errno("sigaddset");
2713 
2714 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2715 	if (errcode)
2716 		return got_error_set_errno(errcode, "pthread_sigmask");
2717 
2718 	return NULL;
2719 }
2720 
2721 static void *
2722 log_thread(void *arg)
2723 {
2724 	const struct got_error *err = NULL;
2725 	int errcode = 0;
2726 	struct tog_log_thread_args *a = arg;
2727 	int done = 0;
2728 
2729 	/*
2730 	 * Sync startup with main thread such that we begin our
2731 	 * work once view_input() has released the mutex.
2732 	 */
2733 	errcode = pthread_mutex_lock(&tog_mutex);
2734 	if (errcode) {
2735 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2736 		return (void *)err;
2737 	}
2738 
2739 	err = block_signals_used_by_main_thread();
2740 	if (err) {
2741 		pthread_mutex_unlock(&tog_mutex);
2742 		goto done;
2743 	}
2744 
2745 	while (!done && !err && !tog_fatal_signal_received()) {
2746 		errcode = pthread_mutex_unlock(&tog_mutex);
2747 		if (errcode) {
2748 			err = got_error_set_errno(errcode,
2749 			    "pthread_mutex_unlock");
2750 			goto done;
2751 		}
2752 		err = queue_commits(a);
2753 		if (err) {
2754 			if (err->code != GOT_ERR_ITER_COMPLETED)
2755 				goto done;
2756 			err = NULL;
2757 			done = 1;
2758 		} else if (a->commits_needed > 0 && !a->load_all)
2759 			a->commits_needed--;
2760 
2761 		errcode = pthread_mutex_lock(&tog_mutex);
2762 		if (errcode) {
2763 			err = got_error_set_errno(errcode,
2764 			    "pthread_mutex_lock");
2765 			goto done;
2766 		} else if (*a->quit)
2767 			done = 1;
2768 		else if (*a->first_displayed_entry == NULL) {
2769 			*a->first_displayed_entry =
2770 			    TAILQ_FIRST(&a->commits->head);
2771 			*a->selected_entry = *a->first_displayed_entry;
2772 		}
2773 
2774 		errcode = pthread_cond_signal(&a->commit_loaded);
2775 		if (errcode) {
2776 			err = got_error_set_errno(errcode,
2777 			    "pthread_cond_signal");
2778 			pthread_mutex_unlock(&tog_mutex);
2779 			goto done;
2780 		}
2781 
2782 		if (done)
2783 			a->commits_needed = 0;
2784 		else {
2785 			if (a->commits_needed == 0 && !a->load_all) {
2786 				errcode = pthread_cond_wait(&a->need_commits,
2787 				    &tog_mutex);
2788 				if (errcode) {
2789 					err = got_error_set_errno(errcode,
2790 					    "pthread_cond_wait");
2791 					pthread_mutex_unlock(&tog_mutex);
2792 					goto done;
2793 				}
2794 				if (*a->quit)
2795 					done = 1;
2796 			}
2797 		}
2798 	}
2799 	a->log_complete = 1;
2800 	errcode = pthread_mutex_unlock(&tog_mutex);
2801 	if (errcode)
2802 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2803 done:
2804 	if (err) {
2805 		tog_thread_error = 1;
2806 		pthread_cond_signal(&a->commit_loaded);
2807 	}
2808 	return (void *)err;
2809 }
2810 
2811 static const struct got_error *
2812 stop_log_thread(struct tog_log_view_state *s)
2813 {
2814 	const struct got_error *err = NULL, *thread_err = NULL;
2815 	int errcode;
2816 
2817 	if (s->thread) {
2818 		s->quit = 1;
2819 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2820 		if (errcode)
2821 			return got_error_set_errno(errcode,
2822 			    "pthread_cond_signal");
2823 		errcode = pthread_mutex_unlock(&tog_mutex);
2824 		if (errcode)
2825 			return got_error_set_errno(errcode,
2826 			    "pthread_mutex_unlock");
2827 		errcode = pthread_join(s->thread, (void **)&thread_err);
2828 		if (errcode)
2829 			return got_error_set_errno(errcode, "pthread_join");
2830 		errcode = pthread_mutex_lock(&tog_mutex);
2831 		if (errcode)
2832 			return got_error_set_errno(errcode,
2833 			    "pthread_mutex_lock");
2834 		s->thread = NULL;
2835 	}
2836 
2837 	if (s->thread_args.repo) {
2838 		err = got_repo_close(s->thread_args.repo);
2839 		s->thread_args.repo = NULL;
2840 	}
2841 
2842 	if (s->thread_args.pack_fds) {
2843 		const struct got_error *pack_err =
2844 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2845 		if (err == NULL)
2846 			err = pack_err;
2847 		s->thread_args.pack_fds = NULL;
2848 	}
2849 
2850 	if (s->thread_args.graph) {
2851 		got_commit_graph_close(s->thread_args.graph);
2852 		s->thread_args.graph = NULL;
2853 	}
2854 
2855 	return err ? err : thread_err;
2856 }
2857 
2858 static const struct got_error *
2859 close_log_view(struct tog_view *view)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_log_view_state *s = &view->state.log;
2863 	int errcode;
2864 
2865 	err = stop_log_thread(s);
2866 
2867 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2868 	if (errcode && err == NULL)
2869 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2870 
2871 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2872 	if (errcode && err == NULL)
2873 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2874 
2875 	free_commits(&s->commits);
2876 	free(s->in_repo_path);
2877 	s->in_repo_path = NULL;
2878 	free(s->start_id);
2879 	s->start_id = NULL;
2880 	free(s->head_ref_name);
2881 	s->head_ref_name = NULL;
2882 	return err;
2883 }
2884 
2885 static const struct got_error *
2886 search_start_log_view(struct tog_view *view)
2887 {
2888 	struct tog_log_view_state *s = &view->state.log;
2889 
2890 	s->matched_entry = NULL;
2891 	s->search_entry = NULL;
2892 	return NULL;
2893 }
2894 
2895 static const struct got_error *
2896 search_next_log_view(struct tog_view *view)
2897 {
2898 	const struct got_error *err = NULL;
2899 	struct tog_log_view_state *s = &view->state.log;
2900 	struct commit_queue_entry *entry;
2901 
2902 	/* Display progress update in log view. */
2903 	show_log_view(view);
2904 	update_panels();
2905 	doupdate();
2906 
2907 	if (s->search_entry) {
2908 		int errcode, ch;
2909 		errcode = pthread_mutex_unlock(&tog_mutex);
2910 		if (errcode)
2911 			return got_error_set_errno(errcode,
2912 			    "pthread_mutex_unlock");
2913 		ch = wgetch(view->window);
2914 		errcode = pthread_mutex_lock(&tog_mutex);
2915 		if (errcode)
2916 			return got_error_set_errno(errcode,
2917 			    "pthread_mutex_lock");
2918 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
2919 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2920 			return NULL;
2921 		}
2922 		if (view->searching == TOG_SEARCH_FORWARD)
2923 			entry = TAILQ_NEXT(s->search_entry, entry);
2924 		else
2925 			entry = TAILQ_PREV(s->search_entry,
2926 			    commit_queue_head, entry);
2927 	} else if (s->matched_entry) {
2928 		int matched_idx = s->matched_entry->idx;
2929 		int selected_idx = s->selected_entry->idx;
2930 
2931 		/*
2932 		 * If the user has moved the cursor after we hit a match,
2933 		 * the position from where we should continue searching
2934 		 * might have changed.
2935 		 */
2936 		if (view->searching == TOG_SEARCH_FORWARD) {
2937 			if (matched_idx > selected_idx)
2938 				entry = TAILQ_NEXT(s->selected_entry, entry);
2939 			else
2940 				entry = TAILQ_NEXT(s->matched_entry, entry);
2941 		} else {
2942 			if (matched_idx < selected_idx)
2943 				entry = TAILQ_PREV(s->selected_entry,
2944 						commit_queue_head, entry);
2945 			else
2946 				entry = TAILQ_PREV(s->matched_entry,
2947 						commit_queue_head, entry);
2948 		}
2949 	} else {
2950 		entry = s->selected_entry;
2951 	}
2952 
2953 	while (1) {
2954 		int have_match = 0;
2955 
2956 		if (entry == NULL) {
2957 			if (s->thread_args.log_complete ||
2958 			    view->searching == TOG_SEARCH_BACKWARD) {
2959 				view->search_next_done =
2960 				    (s->matched_entry == NULL ?
2961 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
2962 				s->search_entry = NULL;
2963 				return NULL;
2964 			}
2965 			/*
2966 			 * Poke the log thread for more commits and return,
2967 			 * allowing the main loop to make progress. Search
2968 			 * will resume at s->search_entry once we come back.
2969 			 */
2970 			s->thread_args.commits_needed++;
2971 			return trigger_log_thread(view, 0);
2972 		}
2973 
2974 		err = match_commit(&have_match, entry->id, entry->commit,
2975 		    &view->regex);
2976 		if (err)
2977 			break;
2978 		if (have_match) {
2979 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
2980 			s->matched_entry = entry;
2981 			break;
2982 		}
2983 
2984 		s->search_entry = entry;
2985 		if (view->searching == TOG_SEARCH_FORWARD)
2986 			entry = TAILQ_NEXT(entry, entry);
2987 		else
2988 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
2989 	}
2990 
2991 	if (s->matched_entry) {
2992 		int cur = s->selected_entry->idx;
2993 		while (cur < s->matched_entry->idx) {
2994 			err = input_log_view(NULL, view, KEY_DOWN);
2995 			if (err)
2996 				return err;
2997 			cur++;
2998 		}
2999 		while (cur > s->matched_entry->idx) {
3000 			err = input_log_view(NULL, view, KEY_UP);
3001 			if (err)
3002 				return err;
3003 			cur--;
3004 		}
3005 	}
3006 
3007 	s->search_entry = NULL;
3008 
3009 	return NULL;
3010 }
3011 
3012 static const struct got_error *
3013 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3014     struct got_repository *repo, const char *head_ref_name,
3015     const char *in_repo_path, int log_branches)
3016 {
3017 	const struct got_error *err = NULL;
3018 	struct tog_log_view_state *s = &view->state.log;
3019 	struct got_repository *thread_repo = NULL;
3020 	struct got_commit_graph *thread_graph = NULL;
3021 	int errcode;
3022 
3023 	if (in_repo_path != s->in_repo_path) {
3024 		free(s->in_repo_path);
3025 		s->in_repo_path = strdup(in_repo_path);
3026 		if (s->in_repo_path == NULL)
3027 			return got_error_from_errno("strdup");
3028 	}
3029 
3030 	/* The commit queue only contains commits being displayed. */
3031 	TAILQ_INIT(&s->commits.head);
3032 	s->commits.ncommits = 0;
3033 
3034 	s->repo = repo;
3035 	if (head_ref_name) {
3036 		s->head_ref_name = strdup(head_ref_name);
3037 		if (s->head_ref_name == NULL) {
3038 			err = got_error_from_errno("strdup");
3039 			goto done;
3040 		}
3041 	}
3042 	s->start_id = got_object_id_dup(start_id);
3043 	if (s->start_id == NULL) {
3044 		err = got_error_from_errno("got_object_id_dup");
3045 		goto done;
3046 	}
3047 	s->log_branches = log_branches;
3048 
3049 	STAILQ_INIT(&s->colors);
3050 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3051 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3052 		    get_color_value("TOG_COLOR_COMMIT"));
3053 		if (err)
3054 			goto done;
3055 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3056 		    get_color_value("TOG_COLOR_AUTHOR"));
3057 		if (err) {
3058 			free_colors(&s->colors);
3059 			goto done;
3060 		}
3061 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3062 		    get_color_value("TOG_COLOR_DATE"));
3063 		if (err) {
3064 			free_colors(&s->colors);
3065 			goto done;
3066 		}
3067 	}
3068 
3069 	view->show = show_log_view;
3070 	view->input = input_log_view;
3071 	view->resize = resize_log_view;
3072 	view->close = close_log_view;
3073 	view->search_start = search_start_log_view;
3074 	view->search_next = search_next_log_view;
3075 
3076 	if (s->thread_args.pack_fds == NULL) {
3077 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3078 		if (err)
3079 			goto done;
3080 	}
3081 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3082 	    s->thread_args.pack_fds);
3083 	if (err)
3084 		goto done;
3085 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3086 	    !s->log_branches);
3087 	if (err)
3088 		goto done;
3089 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3090 	    s->repo, NULL, NULL);
3091 	if (err)
3092 		goto done;
3093 
3094 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3095 	if (errcode) {
3096 		err = got_error_set_errno(errcode, "pthread_cond_init");
3097 		goto done;
3098 	}
3099 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3100 	if (errcode) {
3101 		err = got_error_set_errno(errcode, "pthread_cond_init");
3102 		goto done;
3103 	}
3104 
3105 	s->thread_args.commits_needed = view->nlines;
3106 	s->thread_args.graph = thread_graph;
3107 	s->thread_args.commits = &s->commits;
3108 	s->thread_args.in_repo_path = s->in_repo_path;
3109 	s->thread_args.start_id = s->start_id;
3110 	s->thread_args.repo = thread_repo;
3111 	s->thread_args.log_complete = 0;
3112 	s->thread_args.quit = &s->quit;
3113 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3114 	s->thread_args.selected_entry = &s->selected_entry;
3115 	s->thread_args.searching = &view->searching;
3116 	s->thread_args.search_next_done = &view->search_next_done;
3117 	s->thread_args.regex = &view->regex;
3118 done:
3119 	if (err)
3120 		close_log_view(view);
3121 	return err;
3122 }
3123 
3124 static const struct got_error *
3125 show_log_view(struct tog_view *view)
3126 {
3127 	const struct got_error *err;
3128 	struct tog_log_view_state *s = &view->state.log;
3129 
3130 	if (s->thread == NULL) {
3131 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3132 		    &s->thread_args);
3133 		if (errcode)
3134 			return got_error_set_errno(errcode, "pthread_create");
3135 		if (s->thread_args.commits_needed > 0) {
3136 			err = trigger_log_thread(view, 1);
3137 			if (err)
3138 				return err;
3139 		}
3140 	}
3141 
3142 	return draw_commits(view);
3143 }
3144 
3145 static void
3146 log_move_cursor_up(struct tog_view *view, int page, int home)
3147 {
3148 	struct tog_log_view_state *s = &view->state.log;
3149 
3150 	if (s->selected_entry->idx == 0)
3151 		view->count = 0;
3152 	if (s->first_displayed_entry == NULL)
3153 		return;
3154 
3155 	if ((page && TAILQ_FIRST(&s->commits.head) == s->first_displayed_entry)
3156 	    || home)
3157 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3158 
3159 	if (!page && !home && s->selected > 0)
3160 		--s->selected;
3161 	else
3162 		log_scroll_up(s, home ? s->commits.ncommits : MAX(page, 1));
3163 
3164 	select_commit(s);
3165 	return;
3166 }
3167 
3168 static const struct got_error *
3169 log_move_cursor_down(struct tog_view *view, int page)
3170 {
3171 	struct tog_log_view_state	*s = &view->state.log;
3172 	const struct got_error		*err = NULL;
3173 	int				 eos = view->nlines - 2;
3174 
3175 	if (s->thread_args.log_complete &&
3176 	    s->selected_entry->idx >= s->commits.ncommits - 1)
3177 		return NULL;
3178 
3179 	if (view_is_hsplit_top(view))
3180 		--eos;  /* border consumes the last line */
3181 
3182 	if (!page) {
3183 		if (s->selected < MIN(eos, s->commits.ncommits - 1))
3184 			++s->selected;
3185 		else
3186 			err = log_scroll_down(view, 1);
3187 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3188 		struct commit_queue_entry *entry;
3189 		int n;
3190 
3191 		s->selected = 0;
3192 		entry = TAILQ_LAST(&s->commits.head, commit_queue_head);
3193 		s->last_displayed_entry = entry;
3194 		for (n = 0; n <= eos; n++) {
3195 			if (entry == NULL)
3196 				break;
3197 			s->first_displayed_entry = entry;
3198 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3199 		}
3200 		if (n > 0)
3201 			s->selected = n - 1;
3202 	} else {
3203 		if (s->last_displayed_entry->idx == s->commits.ncommits - 1 &&
3204 		    s->thread_args.log_complete)
3205 			s->selected += MIN(page,
3206 			    s->commits.ncommits - s->selected_entry->idx - 1);
3207 		else
3208 			err = log_scroll_down(view, page);
3209 	}
3210 	if (err)
3211 		return err;
3212 
3213 	/*
3214 	 * We might necessarily overshoot in horizontal
3215 	 * splits; if so, select the last displayed commit.
3216 	 */
3217 	if (s->first_displayed_entry && s->last_displayed_entry) {
3218 		s->selected = MIN(s->selected,
3219 		    s->last_displayed_entry->idx -
3220 		    s->first_displayed_entry->idx);
3221 	}
3222 
3223 	select_commit(s);
3224 
3225 	if (s->thread_args.log_complete &&
3226 	    s->selected_entry->idx == s->commits.ncommits - 1)
3227 		view->count = 0;
3228 
3229 	return NULL;
3230 }
3231 
3232 static void
3233 view_get_split(struct tog_view *view, int *y, int *x)
3234 {
3235 	*x = 0;
3236 	*y = 0;
3237 
3238 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3239 		if (view->child && view->child->resized_y)
3240 			*y = view->child->resized_y;
3241 		else if (view->resized_y)
3242 			*y = view->resized_y;
3243 		else
3244 			*y = view_split_begin_y(view->lines);
3245 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3246 		if (view->child && view->child->resized_x)
3247 			*x = view->child->resized_x;
3248 		else if (view->resized_x)
3249 			*x = view->resized_x;
3250 		else
3251 			*x = view_split_begin_x(view->begin_x);
3252 	}
3253 }
3254 
3255 /* Split view horizontally at y and offset view->state->selected line. */
3256 static const struct got_error *
3257 view_init_hsplit(struct tog_view *view, int y)
3258 {
3259 	const struct got_error *err = NULL;
3260 
3261 	view->nlines = y;
3262 	view->ncols = COLS;
3263 	err = view_resize(view);
3264 	if (err)
3265 		return err;
3266 
3267 	err = offset_selection_down(view);
3268 
3269 	return err;
3270 }
3271 
3272 static const struct got_error *
3273 log_goto_line(struct tog_view *view, int nlines)
3274 {
3275 	const struct got_error		*err = NULL;
3276 	struct tog_log_view_state	*s = &view->state.log;
3277 	int				 g, idx = s->selected_entry->idx;
3278 
3279 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3280 		return NULL;
3281 
3282 	g = view->gline;
3283 	view->gline = 0;
3284 
3285 	if (g >= s->first_displayed_entry->idx + 1 &&
3286 	    g <= s->last_displayed_entry->idx + 1 &&
3287 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3288 		s->selected = g - s->first_displayed_entry->idx - 1;
3289 		select_commit(s);
3290 		return NULL;
3291 	}
3292 
3293 	if (idx + 1 < g) {
3294 		err = log_move_cursor_down(view, g - idx - 1);
3295 		if (!err && g > s->selected_entry->idx + 1)
3296 			err = log_move_cursor_down(view,
3297 			    g - s->first_displayed_entry->idx - 1);
3298 		if (err)
3299 			return err;
3300 	} else if (idx + 1 > g)
3301 		log_move_cursor_up(view, idx - g + 1, 0);
3302 
3303 	if (g < nlines && s->first_displayed_entry->idx == 0)
3304 		s->selected = g - 1;
3305 
3306 	select_commit(s);
3307 	return NULL;
3308 
3309 }
3310 
3311 static const struct got_error *
3312 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3313 {
3314 	const struct got_error *err = NULL;
3315 	struct tog_log_view_state *s = &view->state.log;
3316 	int eos, nscroll;
3317 
3318 	if (s->thread_args.load_all) {
3319 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3320 			s->thread_args.load_all = 0;
3321 		else if (s->thread_args.log_complete) {
3322 			err = log_move_cursor_down(view, s->commits.ncommits);
3323 			s->thread_args.load_all = 0;
3324 		}
3325 		if (err)
3326 			return err;
3327 	}
3328 
3329 	eos = nscroll = view->nlines - 1;
3330 	if (view_is_hsplit_top(view))
3331 		--eos;  /* border */
3332 
3333 	if (view->gline)
3334 		return log_goto_line(view, eos);
3335 
3336 	switch (ch) {
3337 	case 'q':
3338 		s->quit = 1;
3339 		break;
3340 	case '0':
3341 		view->x = 0;
3342 		break;
3343 	case '$':
3344 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3345 		view->count = 0;
3346 		break;
3347 	case KEY_RIGHT:
3348 	case 'l':
3349 		if (view->x + view->ncols / 2 < view->maxx)
3350 			view->x += 2;  /* move two columns right */
3351 		else
3352 			view->count = 0;
3353 		break;
3354 	case KEY_LEFT:
3355 	case 'h':
3356 		view->x -= MIN(view->x, 2);  /* move two columns back */
3357 		if (view->x <= 0)
3358 			view->count = 0;
3359 		break;
3360 	case 'k':
3361 	case KEY_UP:
3362 	case '<':
3363 	case ',':
3364 	case CTRL('p'):
3365 		log_move_cursor_up(view, 0, 0);
3366 		break;
3367 	case 'g':
3368 	case KEY_HOME:
3369 		log_move_cursor_up(view, 0, 1);
3370 		view->count = 0;
3371 		break;
3372 	case CTRL('u'):
3373 	case 'u':
3374 		nscroll /= 2;
3375 		/* FALL THROUGH */
3376 	case KEY_PPAGE:
3377 	case CTRL('b'):
3378 	case 'b':
3379 		log_move_cursor_up(view, nscroll, 0);
3380 		break;
3381 	case 'j':
3382 	case KEY_DOWN:
3383 	case '>':
3384 	case '.':
3385 	case CTRL('n'):
3386 		err = log_move_cursor_down(view, 0);
3387 		break;
3388 	case '@':
3389 		s->use_committer = !s->use_committer;
3390 		break;
3391 	case 'G':
3392 	case KEY_END: {
3393 		/* We don't know yet how many commits, so we're forced to
3394 		 * traverse them all. */
3395 		view->count = 0;
3396 		s->thread_args.load_all = 1;
3397 		if (!s->thread_args.log_complete)
3398 			return trigger_log_thread(view, 0);
3399 		err = log_move_cursor_down(view, s->commits.ncommits);
3400 		s->thread_args.load_all = 0;
3401 		break;
3402 	}
3403 	case CTRL('d'):
3404 	case 'd':
3405 		nscroll /= 2;
3406 		/* FALL THROUGH */
3407 	case KEY_NPAGE:
3408 	case CTRL('f'):
3409 	case 'f':
3410 	case ' ':
3411 		err = log_move_cursor_down(view, nscroll);
3412 		break;
3413 	case KEY_RESIZE:
3414 		if (s->selected > view->nlines - 2)
3415 			s->selected = view->nlines - 2;
3416 		if (s->selected > s->commits.ncommits - 1)
3417 			s->selected = s->commits.ncommits - 1;
3418 		select_commit(s);
3419 		if (s->commits.ncommits < view->nlines - 1 &&
3420 		    !s->thread_args.log_complete) {
3421 			s->thread_args.commits_needed += (view->nlines - 1) -
3422 			    s->commits.ncommits;
3423 			err = trigger_log_thread(view, 1);
3424 		}
3425 		break;
3426 	case KEY_ENTER:
3427 	case '\r':
3428 		view->count = 0;
3429 		if (s->selected_entry == NULL)
3430 			break;
3431 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3432 		break;
3433 	case 'T':
3434 		view->count = 0;
3435 		if (s->selected_entry == NULL)
3436 			break;
3437 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3438 		break;
3439 	case KEY_BACKSPACE:
3440 	case CTRL('l'):
3441 	case 'B':
3442 		view->count = 0;
3443 		if (ch == KEY_BACKSPACE &&
3444 		    got_path_is_root_dir(s->in_repo_path))
3445 			break;
3446 		err = stop_log_thread(s);
3447 		if (err)
3448 			return err;
3449 		if (ch == KEY_BACKSPACE) {
3450 			char *parent_path;
3451 			err = got_path_dirname(&parent_path, s->in_repo_path);
3452 			if (err)
3453 				return err;
3454 			free(s->in_repo_path);
3455 			s->in_repo_path = parent_path;
3456 			s->thread_args.in_repo_path = s->in_repo_path;
3457 		} else if (ch == CTRL('l')) {
3458 			struct got_object_id *start_id;
3459 			err = got_repo_match_object_id(&start_id, NULL,
3460 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3461 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3462 			if (err)
3463 				return err;
3464 			free(s->start_id);
3465 			s->start_id = start_id;
3466 			s->thread_args.start_id = s->start_id;
3467 		} else /* 'B' */
3468 			s->log_branches = !s->log_branches;
3469 
3470 		if (s->thread_args.pack_fds == NULL) {
3471 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3472 			if (err)
3473 				return err;
3474 		}
3475 		err = got_repo_open(&s->thread_args.repo,
3476 		    got_repo_get_path(s->repo), NULL,
3477 		    s->thread_args.pack_fds);
3478 		if (err)
3479 			return err;
3480 		tog_free_refs();
3481 		err = tog_load_refs(s->repo, 0);
3482 		if (err)
3483 			return err;
3484 		err = got_commit_graph_open(&s->thread_args.graph,
3485 		    s->in_repo_path, !s->log_branches);
3486 		if (err)
3487 			return err;
3488 		err = got_commit_graph_iter_start(s->thread_args.graph,
3489 		    s->start_id, s->repo, NULL, NULL);
3490 		if (err)
3491 			return err;
3492 		free_commits(&s->commits);
3493 		s->first_displayed_entry = NULL;
3494 		s->last_displayed_entry = NULL;
3495 		s->selected_entry = NULL;
3496 		s->selected = 0;
3497 		s->thread_args.log_complete = 0;
3498 		s->quit = 0;
3499 		s->thread_args.commits_needed = view->lines;
3500 		s->matched_entry = NULL;
3501 		s->search_entry = NULL;
3502 		view->offset = 0;
3503 		break;
3504 	case 'R':
3505 		view->count = 0;
3506 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3507 		break;
3508 	default:
3509 		view->count = 0;
3510 		break;
3511 	}
3512 
3513 	return err;
3514 }
3515 
3516 static const struct got_error *
3517 apply_unveil(const char *repo_path, const char *worktree_path)
3518 {
3519 	const struct got_error *error;
3520 
3521 #ifdef PROFILE
3522 	if (unveil("gmon.out", "rwc") != 0)
3523 		return got_error_from_errno2("unveil", "gmon.out");
3524 #endif
3525 	if (repo_path && unveil(repo_path, "r") != 0)
3526 		return got_error_from_errno2("unveil", repo_path);
3527 
3528 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3529 		return got_error_from_errno2("unveil", worktree_path);
3530 
3531 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3532 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3533 
3534 	error = got_privsep_unveil_exec_helpers();
3535 	if (error != NULL)
3536 		return error;
3537 
3538 	if (unveil(NULL, NULL) != 0)
3539 		return got_error_from_errno("unveil");
3540 
3541 	return NULL;
3542 }
3543 
3544 static void
3545 init_curses(void)
3546 {
3547 	/*
3548 	 * Override default signal handlers before starting ncurses.
3549 	 * This should prevent ncurses from installing its own
3550 	 * broken cleanup() signal handler.
3551 	 */
3552 	signal(SIGWINCH, tog_sigwinch);
3553 	signal(SIGPIPE, tog_sigpipe);
3554 	signal(SIGCONT, tog_sigcont);
3555 	signal(SIGINT, tog_sigint);
3556 	signal(SIGTERM, tog_sigterm);
3557 
3558 	initscr();
3559 	cbreak();
3560 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3561 	noecho();
3562 	nonl();
3563 	intrflush(stdscr, FALSE);
3564 	keypad(stdscr, TRUE);
3565 	curs_set(0);
3566 	if (getenv("TOG_COLORS") != NULL) {
3567 		start_color();
3568 		use_default_colors();
3569 	}
3570 }
3571 
3572 static const struct got_error *
3573 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3574     struct got_repository *repo, struct got_worktree *worktree)
3575 {
3576 	const struct got_error *err = NULL;
3577 
3578 	if (argc == 0) {
3579 		*in_repo_path = strdup("/");
3580 		if (*in_repo_path == NULL)
3581 			return got_error_from_errno("strdup");
3582 		return NULL;
3583 	}
3584 
3585 	if (worktree) {
3586 		const char *prefix = got_worktree_get_path_prefix(worktree);
3587 		char *p;
3588 
3589 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3590 		if (err)
3591 			return err;
3592 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3593 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3594 		    p) == -1) {
3595 			err = got_error_from_errno("asprintf");
3596 			*in_repo_path = NULL;
3597 		}
3598 		free(p);
3599 	} else
3600 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3601 
3602 	return err;
3603 }
3604 
3605 static const struct got_error *
3606 cmd_log(int argc, char *argv[])
3607 {
3608 	const struct got_error *error;
3609 	struct got_repository *repo = NULL;
3610 	struct got_worktree *worktree = NULL;
3611 	struct got_object_id *start_id = NULL;
3612 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3613 	char *start_commit = NULL, *label = NULL;
3614 	struct got_reference *ref = NULL;
3615 	const char *head_ref_name = NULL;
3616 	int ch, log_branches = 0;
3617 	struct tog_view *view;
3618 	int *pack_fds = NULL;
3619 
3620 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3621 		switch (ch) {
3622 		case 'b':
3623 			log_branches = 1;
3624 			break;
3625 		case 'c':
3626 			start_commit = optarg;
3627 			break;
3628 		case 'r':
3629 			repo_path = realpath(optarg, NULL);
3630 			if (repo_path == NULL)
3631 				return got_error_from_errno2("realpath",
3632 				    optarg);
3633 			break;
3634 		default:
3635 			usage_log();
3636 			/* NOTREACHED */
3637 		}
3638 	}
3639 
3640 	argc -= optind;
3641 	argv += optind;
3642 
3643 	if (argc > 1)
3644 		usage_log();
3645 
3646 	error = got_repo_pack_fds_open(&pack_fds);
3647 	if (error != NULL)
3648 		goto done;
3649 
3650 	if (repo_path == NULL) {
3651 		cwd = getcwd(NULL, 0);
3652 		if (cwd == NULL)
3653 			return got_error_from_errno("getcwd");
3654 		error = got_worktree_open(&worktree, cwd);
3655 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3656 			goto done;
3657 		if (worktree)
3658 			repo_path =
3659 			    strdup(got_worktree_get_repo_path(worktree));
3660 		else
3661 			repo_path = strdup(cwd);
3662 		if (repo_path == NULL) {
3663 			error = got_error_from_errno("strdup");
3664 			goto done;
3665 		}
3666 	}
3667 
3668 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3669 	if (error != NULL)
3670 		goto done;
3671 
3672 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3673 	    repo, worktree);
3674 	if (error)
3675 		goto done;
3676 
3677 	init_curses();
3678 
3679 	error = apply_unveil(got_repo_get_path(repo),
3680 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3681 	if (error)
3682 		goto done;
3683 
3684 	/* already loaded by tog_log_with_path()? */
3685 	if (TAILQ_EMPTY(&tog_refs)) {
3686 		error = tog_load_refs(repo, 0);
3687 		if (error)
3688 			goto done;
3689 	}
3690 
3691 	if (start_commit == NULL) {
3692 		error = got_repo_match_object_id(&start_id, &label,
3693 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3694 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3695 		if (error)
3696 			goto done;
3697 		head_ref_name = label;
3698 	} else {
3699 		error = got_ref_open(&ref, repo, start_commit, 0);
3700 		if (error == NULL)
3701 			head_ref_name = got_ref_get_name(ref);
3702 		else if (error->code != GOT_ERR_NOT_REF)
3703 			goto done;
3704 		error = got_repo_match_object_id(&start_id, NULL,
3705 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3706 		if (error)
3707 			goto done;
3708 	}
3709 
3710 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3711 	if (view == NULL) {
3712 		error = got_error_from_errno("view_open");
3713 		goto done;
3714 	}
3715 	error = open_log_view(view, start_id, repo, head_ref_name,
3716 	    in_repo_path, log_branches);
3717 	if (error)
3718 		goto done;
3719 	if (worktree) {
3720 		/* Release work tree lock. */
3721 		got_worktree_close(worktree);
3722 		worktree = NULL;
3723 	}
3724 	error = view_loop(view);
3725 done:
3726 	free(in_repo_path);
3727 	free(repo_path);
3728 	free(cwd);
3729 	free(start_id);
3730 	free(label);
3731 	if (ref)
3732 		got_ref_close(ref);
3733 	if (repo) {
3734 		const struct got_error *close_err = got_repo_close(repo);
3735 		if (error == NULL)
3736 			error = close_err;
3737 	}
3738 	if (worktree)
3739 		got_worktree_close(worktree);
3740 	if (pack_fds) {
3741 		const struct got_error *pack_err =
3742 		    got_repo_pack_fds_close(pack_fds);
3743 		if (error == NULL)
3744 			error = pack_err;
3745 	}
3746 	tog_free_refs();
3747 	return error;
3748 }
3749 
3750 __dead static void
3751 usage_diff(void)
3752 {
3753 	endwin();
3754 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3755 	    "object1 object2\n", getprogname());
3756 	exit(1);
3757 }
3758 
3759 static int
3760 match_line(const char *line, regex_t *regex, size_t nmatch,
3761     regmatch_t *regmatch)
3762 {
3763 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3764 }
3765 
3766 static struct tog_color *
3767 match_color(struct tog_colors *colors, const char *line)
3768 {
3769 	struct tog_color *tc = NULL;
3770 
3771 	STAILQ_FOREACH(tc, colors, entry) {
3772 		if (match_line(line, &tc->regex, 0, NULL))
3773 			return tc;
3774 	}
3775 
3776 	return NULL;
3777 }
3778 
3779 static const struct got_error *
3780 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3781     WINDOW *window, int skipcol, regmatch_t *regmatch)
3782 {
3783 	const struct got_error *err = NULL;
3784 	char *exstr = NULL;
3785 	wchar_t *wline = NULL;
3786 	int rme, rms, n, width, scrollx;
3787 	int width0 = 0, width1 = 0, width2 = 0;
3788 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
3789 
3790 	*wtotal = 0;
3791 
3792 	rms = regmatch->rm_so;
3793 	rme = regmatch->rm_eo;
3794 
3795 	err = expand_tab(&exstr, line);
3796 	if (err)
3797 		return err;
3798 
3799 	/* Split the line into 3 segments, according to match offsets. */
3800 	seg0 = strndup(exstr, rms);
3801 	if (seg0 == NULL) {
3802 		err = got_error_from_errno("strndup");
3803 		goto done;
3804 	}
3805 	seg1 = strndup(exstr + rms, rme - rms);
3806 	if (seg1 == NULL) {
3807 		err = got_error_from_errno("strndup");
3808 		goto done;
3809 	}
3810 	seg2 = strdup(exstr + rme);
3811 	if (seg2 == NULL) {
3812 		err = got_error_from_errno("strndup");
3813 		goto done;
3814 	}
3815 
3816 	/* draw up to matched token if we haven't scrolled past it */
3817 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
3818 	    col_tab_align, 1);
3819 	if (err)
3820 		goto done;
3821 	n = MAX(width0 - skipcol, 0);
3822 	if (n) {
3823 		free(wline);
3824 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
3825 		    wlimit, col_tab_align, 1);
3826 		if (err)
3827 			goto done;
3828 		waddwstr(window, &wline[scrollx]);
3829 		wlimit -= width;
3830 		*wtotal += width;
3831 	}
3832 
3833 	if (wlimit > 0) {
3834 		int i = 0, w = 0;
3835 		size_t wlen;
3836 
3837 		free(wline);
3838 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
3839 		    col_tab_align, 1);
3840 		if (err)
3841 			goto done;
3842 		wlen = wcslen(wline);
3843 		while (i < wlen) {
3844 			width = wcwidth(wline[i]);
3845 			if (width == -1) {
3846 				/* should not happen, tabs are expanded */
3847 				err = got_error(GOT_ERR_RANGE);
3848 				goto done;
3849 			}
3850 			if (width0 + w + width > skipcol)
3851 				break;
3852 			w += width;
3853 			i++;
3854 		}
3855 		/* draw (visible part of) matched token (if scrolled into it) */
3856 		if (width1 - w > 0) {
3857 			wattron(window, A_STANDOUT);
3858 			waddwstr(window, &wline[i]);
3859 			wattroff(window, A_STANDOUT);
3860 			wlimit -= (width1 - w);
3861 			*wtotal += (width1 - w);
3862 		}
3863 	}
3864 
3865 	if (wlimit > 0) {  /* draw rest of line */
3866 		free(wline);
3867 		if (skipcol > width0 + width1) {
3868 			err = format_line(&wline, &width2, &scrollx, seg2,
3869 			    skipcol - (width0 + width1), wlimit,
3870 			    col_tab_align, 1);
3871 			if (err)
3872 				goto done;
3873 			waddwstr(window, &wline[scrollx]);
3874 		} else {
3875 			err = format_line(&wline, &width2, NULL, seg2, 0,
3876 			    wlimit, col_tab_align, 1);
3877 			if (err)
3878 				goto done;
3879 			waddwstr(window, wline);
3880 		}
3881 		*wtotal += width2;
3882 	}
3883 done:
3884 	free(wline);
3885 	free(exstr);
3886 	free(seg0);
3887 	free(seg1);
3888 	free(seg2);
3889 	return err;
3890 }
3891 
3892 static int
3893 gotoline(struct tog_view *view, int *lineno, int *nprinted)
3894 {
3895 	FILE	*f = NULL;
3896 	int	*eof, *first, *selected;
3897 
3898 	if (view->type == TOG_VIEW_DIFF) {
3899 		struct tog_diff_view_state *s = &view->state.diff;
3900 
3901 		first = &s->first_displayed_line;
3902 		selected = first;
3903 		eof = &s->eof;
3904 		f = s->f;
3905 	} else if (view->type == TOG_VIEW_BLAME) {
3906 		struct tog_blame_view_state *s = &view->state.blame;
3907 
3908 		first = &s->first_displayed_line;
3909 		selected = &s->selected_line;
3910 		eof = &s->eof;
3911 		f = s->blame.f;
3912 	} else
3913 		return 0;
3914 
3915 	/* Center gline in the middle of the page like vi(1). */
3916 	if (*lineno < view->gline - (view->nlines - 3) / 2)
3917 		return 0;
3918 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
3919 		rewind(f);
3920 		*eof = 0;
3921 		*first = 1;
3922 		*lineno = 0;
3923 		*nprinted = 0;
3924 		return 0;
3925 	}
3926 
3927 	*selected = view->gline <= (view->nlines - 3) / 2 ?
3928 		view->gline : (view->nlines - 3) / 2 + 1;
3929 	view->gline = 0;
3930 
3931 	return 1;
3932 }
3933 
3934 static const struct got_error *
3935 draw_file(struct tog_view *view, const char *header)
3936 {
3937 	struct tog_diff_view_state *s = &view->state.diff;
3938 	regmatch_t *regmatch = &view->regmatch;
3939 	const struct got_error *err;
3940 	int nprinted = 0;
3941 	char *line;
3942 	size_t linesize = 0;
3943 	ssize_t linelen;
3944 	wchar_t *wline;
3945 	int width;
3946 	int max_lines = view->nlines;
3947 	int nlines = s->nlines;
3948 	off_t line_offset;
3949 
3950 	s->lineno = s->first_displayed_line - 1;
3951 	line_offset = s->lines[s->first_displayed_line - 1].offset;
3952 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
3953 		return got_error_from_errno("fseek");
3954 
3955 	werase(view->window);
3956 
3957 	if (view->gline > s->nlines - 1)
3958 		view->gline = s->nlines - 1;
3959 
3960 	if (header) {
3961 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
3962 		    1 : view->gline - (view->nlines - 3) / 2 :
3963 		    s->lineno + s->selected_line;
3964 
3965 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
3966 			return got_error_from_errno("asprintf");
3967 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
3968 		    0, 0);
3969 		free(line);
3970 		if (err)
3971 			return err;
3972 
3973 		if (view_needs_focus_indication(view))
3974 			wstandout(view->window);
3975 		waddwstr(view->window, wline);
3976 		free(wline);
3977 		wline = NULL;
3978 		while (width++ < view->ncols)
3979 			waddch(view->window, ' ');
3980 		if (view_needs_focus_indication(view))
3981 			wstandend(view->window);
3982 
3983 		if (max_lines <= 1)
3984 			return NULL;
3985 		max_lines--;
3986 	}
3987 
3988 	s->eof = 0;
3989 	view->maxx = 0;
3990 	line = NULL;
3991 	while (max_lines > 0 && nprinted < max_lines) {
3992 		enum got_diff_line_type linetype;
3993 		attr_t attr = 0;
3994 
3995 		linelen = getline(&line, &linesize, s->f);
3996 		if (linelen == -1) {
3997 			if (feof(s->f)) {
3998 				s->eof = 1;
3999 				break;
4000 			}
4001 			free(line);
4002 			return got_ferror(s->f, GOT_ERR_IO);
4003 		}
4004 
4005 		if (++s->lineno < s->first_displayed_line)
4006 			continue;
4007 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4008 			continue;
4009 		if (s->lineno == view->hiline)
4010 			attr = A_STANDOUT;
4011 
4012 		/* Set view->maxx based on full line length. */
4013 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4014 		    view->x ? 1 : 0);
4015 		if (err) {
4016 			free(line);
4017 			return err;
4018 		}
4019 		view->maxx = MAX(view->maxx, width);
4020 		free(wline);
4021 		wline = NULL;
4022 
4023 		linetype = s->lines[s->lineno].type;
4024 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4025 		    linetype < GOT_DIFF_LINE_CONTEXT)
4026 			attr |= COLOR_PAIR(linetype);
4027 		if (attr)
4028 			wattron(view->window, attr);
4029 		if (s->first_displayed_line + nprinted == s->matched_line &&
4030 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4031 			err = add_matched_line(&width, line, view->ncols, 0,
4032 			    view->window, view->x, regmatch);
4033 			if (err) {
4034 				free(line);
4035 				return err;
4036 			}
4037 		} else {
4038 			int skip;
4039 			err = format_line(&wline, &width, &skip, line,
4040 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4041 			if (err) {
4042 				free(line);
4043 				return err;
4044 			}
4045 			waddwstr(view->window, &wline[skip]);
4046 			free(wline);
4047 			wline = NULL;
4048 		}
4049 		if (s->lineno == view->hiline) {
4050 			/* highlight full gline length */
4051 			while (width++ < view->ncols)
4052 				waddch(view->window, ' ');
4053 		} else {
4054 			if (width <= view->ncols - 1)
4055 				waddch(view->window, '\n');
4056 		}
4057 		if (attr)
4058 			wattroff(view->window, attr);
4059 		if (++nprinted == 1)
4060 			s->first_displayed_line = s->lineno;
4061 	}
4062 	free(line);
4063 	if (nprinted >= 1)
4064 		s->last_displayed_line = s->first_displayed_line +
4065 		    (nprinted - 1);
4066 	else
4067 		s->last_displayed_line = s->first_displayed_line;
4068 
4069 	view_border(view);
4070 
4071 	if (s->eof) {
4072 		while (nprinted < view->nlines) {
4073 			waddch(view->window, '\n');
4074 			nprinted++;
4075 		}
4076 
4077 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4078 		    view->ncols, 0, 0);
4079 		if (err) {
4080 			return err;
4081 		}
4082 
4083 		wstandout(view->window);
4084 		waddwstr(view->window, wline);
4085 		free(wline);
4086 		wline = NULL;
4087 		wstandend(view->window);
4088 	}
4089 
4090 	return NULL;
4091 }
4092 
4093 static char *
4094 get_datestr(time_t *time, char *datebuf)
4095 {
4096 	struct tm mytm, *tm;
4097 	char *p, *s;
4098 
4099 	tm = gmtime_r(time, &mytm);
4100 	if (tm == NULL)
4101 		return NULL;
4102 	s = asctime_r(tm, datebuf);
4103 	if (s == NULL)
4104 		return NULL;
4105 	p = strchr(s, '\n');
4106 	if (p)
4107 		*p = '\0';
4108 	return s;
4109 }
4110 
4111 static const struct got_error *
4112 get_changed_paths(struct got_pathlist_head *paths,
4113     struct got_commit_object *commit, struct got_repository *repo)
4114 {
4115 	const struct got_error *err = NULL;
4116 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4117 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4118 	struct got_object_qid *qid;
4119 
4120 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4121 	if (qid != NULL) {
4122 		struct got_commit_object *pcommit;
4123 		err = got_object_open_as_commit(&pcommit, repo,
4124 		    &qid->id);
4125 		if (err)
4126 			return err;
4127 
4128 		tree_id1 = got_object_id_dup(
4129 		    got_object_commit_get_tree_id(pcommit));
4130 		if (tree_id1 == NULL) {
4131 			got_object_commit_close(pcommit);
4132 			return got_error_from_errno("got_object_id_dup");
4133 		}
4134 		got_object_commit_close(pcommit);
4135 
4136 	}
4137 
4138 	if (tree_id1) {
4139 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4140 		if (err)
4141 			goto done;
4142 	}
4143 
4144 	tree_id2 = got_object_commit_get_tree_id(commit);
4145 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4146 	if (err)
4147 		goto done;
4148 
4149 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4150 	    got_diff_tree_collect_changed_paths, paths, 0);
4151 done:
4152 	if (tree1)
4153 		got_object_tree_close(tree1);
4154 	if (tree2)
4155 		got_object_tree_close(tree2);
4156 	free(tree_id1);
4157 	return err;
4158 }
4159 
4160 static const struct got_error *
4161 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4162     off_t off, uint8_t type)
4163 {
4164 	struct got_diff_line *p;
4165 
4166 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4167 	if (p == NULL)
4168 		return got_error_from_errno("reallocarray");
4169 	*lines = p;
4170 	(*lines)[*nlines].offset = off;
4171 	(*lines)[*nlines].type = type;
4172 	(*nlines)++;
4173 
4174 	return NULL;
4175 }
4176 
4177 static const struct got_error *
4178 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4179     struct got_object_id *commit_id, struct got_reflist_head *refs,
4180     struct got_repository *repo, FILE *outfile)
4181 {
4182 	const struct got_error *err = NULL;
4183 	char datebuf[26], *datestr;
4184 	struct got_commit_object *commit;
4185 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4186 	time_t committer_time;
4187 	const char *author, *committer;
4188 	char *refs_str = NULL;
4189 	struct got_pathlist_head changed_paths;
4190 	struct got_pathlist_entry *pe;
4191 	off_t outoff = 0;
4192 	int n;
4193 
4194 	TAILQ_INIT(&changed_paths);
4195 
4196 	if (refs) {
4197 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4198 		if (err)
4199 			return err;
4200 	}
4201 
4202 	err = got_object_open_as_commit(&commit, repo, commit_id);
4203 	if (err)
4204 		return err;
4205 
4206 	err = got_object_id_str(&id_str, commit_id);
4207 	if (err) {
4208 		err = got_error_from_errno("got_object_id_str");
4209 		goto done;
4210 	}
4211 
4212 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4213 	if (err)
4214 		goto done;
4215 
4216 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4217 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4218 	if (n < 0) {
4219 		err = got_error_from_errno("fprintf");
4220 		goto done;
4221 	}
4222 	outoff += n;
4223 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4224 	if (err)
4225 		goto done;
4226 
4227 	n = fprintf(outfile, "from: %s\n",
4228 	    got_object_commit_get_author(commit));
4229 	if (n < 0) {
4230 		err = got_error_from_errno("fprintf");
4231 		goto done;
4232 	}
4233 	outoff += n;
4234 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4235 	if (err)
4236 		goto done;
4237 
4238 	committer_time = got_object_commit_get_committer_time(commit);
4239 	datestr = get_datestr(&committer_time, datebuf);
4240 	if (datestr) {
4241 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4242 		if (n < 0) {
4243 			err = got_error_from_errno("fprintf");
4244 			goto done;
4245 		}
4246 		outoff += n;
4247 		err = add_line_metadata(lines, nlines, outoff,
4248 		    GOT_DIFF_LINE_DATE);
4249 		if (err)
4250 			goto done;
4251 	}
4252 	author = got_object_commit_get_author(commit);
4253 	committer = got_object_commit_get_committer(commit);
4254 	if (strcmp(author, committer) != 0) {
4255 		n = fprintf(outfile, "via: %s\n", committer);
4256 		if (n < 0) {
4257 			err = got_error_from_errno("fprintf");
4258 			goto done;
4259 		}
4260 		outoff += n;
4261 		err = add_line_metadata(lines, nlines, outoff,
4262 		    GOT_DIFF_LINE_AUTHOR);
4263 		if (err)
4264 			goto done;
4265 	}
4266 	if (got_object_commit_get_nparents(commit) > 1) {
4267 		const struct got_object_id_queue *parent_ids;
4268 		struct got_object_qid *qid;
4269 		int pn = 1;
4270 		parent_ids = got_object_commit_get_parent_ids(commit);
4271 		STAILQ_FOREACH(qid, parent_ids, entry) {
4272 			err = got_object_id_str(&id_str, &qid->id);
4273 			if (err)
4274 				goto done;
4275 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4276 			if (n < 0) {
4277 				err = got_error_from_errno("fprintf");
4278 				goto done;
4279 			}
4280 			outoff += n;
4281 			err = add_line_metadata(lines, nlines, outoff,
4282 			    GOT_DIFF_LINE_META);
4283 			if (err)
4284 				goto done;
4285 			free(id_str);
4286 			id_str = NULL;
4287 		}
4288 	}
4289 
4290 	err = got_object_commit_get_logmsg(&logmsg, commit);
4291 	if (err)
4292 		goto done;
4293 	s = logmsg;
4294 	while ((line = strsep(&s, "\n")) != NULL) {
4295 		n = fprintf(outfile, "%s\n", line);
4296 		if (n < 0) {
4297 			err = got_error_from_errno("fprintf");
4298 			goto done;
4299 		}
4300 		outoff += n;
4301 		err = add_line_metadata(lines, nlines, outoff,
4302 		    GOT_DIFF_LINE_LOGMSG);
4303 		if (err)
4304 			goto done;
4305 	}
4306 
4307 	err = get_changed_paths(&changed_paths, commit, repo);
4308 	if (err)
4309 		goto done;
4310 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4311 		struct got_diff_changed_path *cp = pe->data;
4312 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4313 		if (n < 0) {
4314 			err = got_error_from_errno("fprintf");
4315 			goto done;
4316 		}
4317 		outoff += n;
4318 		err = add_line_metadata(lines, nlines, outoff,
4319 		    GOT_DIFF_LINE_CHANGES);
4320 		if (err)
4321 			goto done;
4322 		free((char *)pe->path);
4323 		free(pe->data);
4324 	}
4325 
4326 	fputc('\n', outfile);
4327 	outoff++;
4328 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4329 done:
4330 	got_pathlist_free(&changed_paths);
4331 	free(id_str);
4332 	free(logmsg);
4333 	free(refs_str);
4334 	got_object_commit_close(commit);
4335 	if (err) {
4336 		free(*lines);
4337 		*lines = NULL;
4338 		*nlines = 0;
4339 	}
4340 	return err;
4341 }
4342 
4343 static const struct got_error *
4344 create_diff(struct tog_diff_view_state *s)
4345 {
4346 	const struct got_error *err = NULL;
4347 	FILE *f = NULL;
4348 	int obj_type;
4349 
4350 	free(s->lines);
4351 	s->lines = malloc(sizeof(*s->lines));
4352 	if (s->lines == NULL)
4353 		return got_error_from_errno("malloc");
4354 	s->nlines = 0;
4355 
4356 	f = got_opentemp();
4357 	if (f == NULL) {
4358 		err = got_error_from_errno("got_opentemp");
4359 		goto done;
4360 	}
4361 	if (s->f && fclose(s->f) == EOF) {
4362 		err = got_error_from_errno("fclose");
4363 		goto done;
4364 	}
4365 	s->f = f;
4366 
4367 	if (s->id1)
4368 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4369 	else
4370 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4371 	if (err)
4372 		goto done;
4373 
4374 	switch (obj_type) {
4375 	case GOT_OBJ_TYPE_BLOB:
4376 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4377 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4378 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4379 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4380 		break;
4381 	case GOT_OBJ_TYPE_TREE:
4382 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4383 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4384 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4385 		    s->force_text_diff, s->repo, s->f);
4386 		break;
4387 	case GOT_OBJ_TYPE_COMMIT: {
4388 		const struct got_object_id_queue *parent_ids;
4389 		struct got_object_qid *pid;
4390 		struct got_commit_object *commit2;
4391 		struct got_reflist_head *refs;
4392 
4393 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4394 		if (err)
4395 			goto done;
4396 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4397 		/* Show commit info if we're diffing to a parent/root commit. */
4398 		if (s->id1 == NULL) {
4399 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4400 			    refs, s->repo, s->f);
4401 			if (err)
4402 				goto done;
4403 		} else {
4404 			parent_ids = got_object_commit_get_parent_ids(commit2);
4405 			STAILQ_FOREACH(pid, parent_ids, entry) {
4406 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4407 					err = write_commit_info(&s->lines,
4408 					    &s->nlines, s->id2, refs, s->repo,
4409 					    s->f);
4410 					if (err)
4411 						goto done;
4412 					break;
4413 				}
4414 			}
4415 		}
4416 		got_object_commit_close(commit2);
4417 
4418 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4419 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4420 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4421 		    s->force_text_diff, s->repo, s->f);
4422 		break;
4423 	}
4424 	default:
4425 		err = got_error(GOT_ERR_OBJ_TYPE);
4426 		break;
4427 	}
4428 done:
4429 	if (s->f && fflush(s->f) != 0 && err == NULL)
4430 		err = got_error_from_errno("fflush");
4431 	return err;
4432 }
4433 
4434 static void
4435 diff_view_indicate_progress(struct tog_view *view)
4436 {
4437 	mvwaddstr(view->window, 0, 0, "diffing...");
4438 	update_panels();
4439 	doupdate();
4440 }
4441 
4442 static const struct got_error *
4443 search_start_diff_view(struct tog_view *view)
4444 {
4445 	struct tog_diff_view_state *s = &view->state.diff;
4446 
4447 	s->matched_line = 0;
4448 	return NULL;
4449 }
4450 
4451 static const struct got_error *
4452 search_next_diff_view(struct tog_view *view)
4453 {
4454 	struct tog_diff_view_state *s = &view->state.diff;
4455 	const struct got_error *err = NULL;
4456 	int lineno;
4457 	char *line = NULL;
4458 	size_t linesize = 0;
4459 	ssize_t linelen;
4460 
4461 	if (!view->searching) {
4462 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4463 		return NULL;
4464 	}
4465 
4466 	if (s->matched_line) {
4467 		if (view->searching == TOG_SEARCH_FORWARD)
4468 			lineno = s->matched_line + 1;
4469 		else
4470 			lineno = s->matched_line - 1;
4471 	} else
4472 		lineno = s->first_displayed_line;
4473 
4474 	while (1) {
4475 		off_t offset;
4476 
4477 		if (lineno <= 0 || lineno > s->nlines) {
4478 			if (s->matched_line == 0) {
4479 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4480 				break;
4481 			}
4482 
4483 			if (view->searching == TOG_SEARCH_FORWARD)
4484 				lineno = 1;
4485 			else
4486 				lineno = s->nlines;
4487 		}
4488 
4489 		offset = s->lines[lineno - 1].offset;
4490 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4491 			free(line);
4492 			return got_error_from_errno("fseeko");
4493 		}
4494 		linelen = getline(&line, &linesize, s->f);
4495 		if (linelen != -1) {
4496 			char *exstr;
4497 			err = expand_tab(&exstr, line);
4498 			if (err)
4499 				break;
4500 			if (match_line(exstr, &view->regex, 1,
4501 			    &view->regmatch)) {
4502 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4503 				s->matched_line = lineno;
4504 				free(exstr);
4505 				break;
4506 			}
4507 			free(exstr);
4508 		}
4509 		if (view->searching == TOG_SEARCH_FORWARD)
4510 			lineno++;
4511 		else
4512 			lineno--;
4513 	}
4514 	free(line);
4515 
4516 	if (s->matched_line) {
4517 		s->first_displayed_line = s->matched_line;
4518 		s->selected_line = 1;
4519 	}
4520 
4521 	return err;
4522 }
4523 
4524 static const struct got_error *
4525 close_diff_view(struct tog_view *view)
4526 {
4527 	const struct got_error *err = NULL;
4528 	struct tog_diff_view_state *s = &view->state.diff;
4529 
4530 	free(s->id1);
4531 	s->id1 = NULL;
4532 	free(s->id2);
4533 	s->id2 = NULL;
4534 	if (s->f && fclose(s->f) == EOF)
4535 		err = got_error_from_errno("fclose");
4536 	s->f = NULL;
4537 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4538 		err = got_error_from_errno("fclose");
4539 	s->f1 = NULL;
4540 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4541 		err = got_error_from_errno("fclose");
4542 	s->f2 = NULL;
4543 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4544 		err = got_error_from_errno("close");
4545 	s->fd1 = -1;
4546 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4547 		err = got_error_from_errno("close");
4548 	s->fd2 = -1;
4549 	free(s->lines);
4550 	s->lines = NULL;
4551 	s->nlines = 0;
4552 	return err;
4553 }
4554 
4555 static const struct got_error *
4556 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4557     struct got_object_id *id2, const char *label1, const char *label2,
4558     int diff_context, int ignore_whitespace, int force_text_diff,
4559     struct tog_view *parent_view, struct got_repository *repo)
4560 {
4561 	const struct got_error *err;
4562 	struct tog_diff_view_state *s = &view->state.diff;
4563 
4564 	memset(s, 0, sizeof(*s));
4565 	s->fd1 = -1;
4566 	s->fd2 = -1;
4567 
4568 	if (id1 != NULL && id2 != NULL) {
4569 	    int type1, type2;
4570 	    err = got_object_get_type(&type1, repo, id1);
4571 	    if (err)
4572 		return err;
4573 	    err = got_object_get_type(&type2, repo, id2);
4574 	    if (err)
4575 		return err;
4576 
4577 	    if (type1 != type2)
4578 		return got_error(GOT_ERR_OBJ_TYPE);
4579 	}
4580 	s->first_displayed_line = 1;
4581 	s->last_displayed_line = view->nlines;
4582 	s->selected_line = 1;
4583 	s->repo = repo;
4584 	s->id1 = id1;
4585 	s->id2 = id2;
4586 	s->label1 = label1;
4587 	s->label2 = label2;
4588 
4589 	if (id1) {
4590 		s->id1 = got_object_id_dup(id1);
4591 		if (s->id1 == NULL)
4592 			return got_error_from_errno("got_object_id_dup");
4593 	} else
4594 		s->id1 = NULL;
4595 
4596 	s->id2 = got_object_id_dup(id2);
4597 	if (s->id2 == NULL) {
4598 		err = got_error_from_errno("got_object_id_dup");
4599 		goto done;
4600 	}
4601 
4602 	s->f1 = got_opentemp();
4603 	if (s->f1 == NULL) {
4604 		err = got_error_from_errno("got_opentemp");
4605 		goto done;
4606 	}
4607 
4608 	s->f2 = got_opentemp();
4609 	if (s->f2 == NULL) {
4610 		err = got_error_from_errno("got_opentemp");
4611 		goto done;
4612 	}
4613 
4614 	s->fd1 = got_opentempfd();
4615 	if (s->fd1 == -1) {
4616 		err = got_error_from_errno("got_opentempfd");
4617 		goto done;
4618 	}
4619 
4620 	s->fd2 = got_opentempfd();
4621 	if (s->fd2 == -1) {
4622 		err = got_error_from_errno("got_opentempfd");
4623 		goto done;
4624 	}
4625 
4626 	s->first_displayed_line = 1;
4627 	s->last_displayed_line = view->nlines;
4628 	s->diff_context = diff_context;
4629 	s->ignore_whitespace = ignore_whitespace;
4630 	s->force_text_diff = force_text_diff;
4631 	s->parent_view = parent_view;
4632 	s->repo = repo;
4633 
4634 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4635 		int rc;
4636 
4637 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4638 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4639 		if (rc != ERR)
4640 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4641 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4642 		if (rc != ERR)
4643 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4644 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4645 		if (rc != ERR)
4646 			rc = init_pair(GOT_DIFF_LINE_META,
4647 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4648 		if (rc != ERR)
4649 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4650 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4651 		if (rc != ERR)
4652 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4653 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4654 		if (rc != ERR)
4655 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4656 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4657 		if (rc != ERR)
4658 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4659 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4660 		if (rc != ERR)
4661 			rc = init_pair(GOT_DIFF_LINE_DATE,
4662 			    get_color_value("TOG_COLOR_DATE"), -1);
4663 		if (rc == ERR) {
4664 			err = got_error(GOT_ERR_RANGE);
4665 			goto done;
4666 		}
4667 	}
4668 
4669 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4670 	    view_is_splitscreen(view))
4671 		show_log_view(parent_view); /* draw border */
4672 	diff_view_indicate_progress(view);
4673 
4674 	err = create_diff(s);
4675 
4676 	view->show = show_diff_view;
4677 	view->input = input_diff_view;
4678 	view->reset = reset_diff_view;
4679 	view->close = close_diff_view;
4680 	view->search_start = search_start_diff_view;
4681 	view->search_next = search_next_diff_view;
4682 done:
4683 	if (err)
4684 		close_diff_view(view);
4685 	return err;
4686 }
4687 
4688 static const struct got_error *
4689 show_diff_view(struct tog_view *view)
4690 {
4691 	const struct got_error *err;
4692 	struct tog_diff_view_state *s = &view->state.diff;
4693 	char *id_str1 = NULL, *id_str2, *header;
4694 	const char *label1, *label2;
4695 
4696 	if (s->id1) {
4697 		err = got_object_id_str(&id_str1, s->id1);
4698 		if (err)
4699 			return err;
4700 		label1 = s->label1 ? s->label1 : id_str1;
4701 	} else
4702 		label1 = "/dev/null";
4703 
4704 	err = got_object_id_str(&id_str2, s->id2);
4705 	if (err)
4706 		return err;
4707 	label2 = s->label2 ? s->label2 : id_str2;
4708 
4709 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4710 		err = got_error_from_errno("asprintf");
4711 		free(id_str1);
4712 		free(id_str2);
4713 		return err;
4714 	}
4715 	free(id_str1);
4716 	free(id_str2);
4717 
4718 	err = draw_file(view, header);
4719 	free(header);
4720 	return err;
4721 }
4722 
4723 static const struct got_error *
4724 set_selected_commit(struct tog_diff_view_state *s,
4725     struct commit_queue_entry *entry)
4726 {
4727 	const struct got_error *err;
4728 	const struct got_object_id_queue *parent_ids;
4729 	struct got_commit_object *selected_commit;
4730 	struct got_object_qid *pid;
4731 
4732 	free(s->id2);
4733 	s->id2 = got_object_id_dup(entry->id);
4734 	if (s->id2 == NULL)
4735 		return got_error_from_errno("got_object_id_dup");
4736 
4737 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4738 	if (err)
4739 		return err;
4740 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4741 	free(s->id1);
4742 	pid = STAILQ_FIRST(parent_ids);
4743 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4744 	got_object_commit_close(selected_commit);
4745 	return NULL;
4746 }
4747 
4748 static const struct got_error *
4749 reset_diff_view(struct tog_view *view)
4750 {
4751 	struct tog_diff_view_state *s = &view->state.diff;
4752 
4753 	view->count = 0;
4754 	wclear(view->window);
4755 	s->first_displayed_line = 1;
4756 	s->last_displayed_line = view->nlines;
4757 	s->matched_line = 0;
4758 	diff_view_indicate_progress(view);
4759 	return create_diff(s);
4760 }
4761 
4762 static void
4763 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4764 {
4765 	int start, i;
4766 
4767 	i = start = s->first_displayed_line - 1;
4768 
4769 	while (s->lines[i].type != type) {
4770 		if (i == 0)
4771 			i = s->nlines - 1;
4772 		if (--i == start)
4773 			return; /* do nothing, requested type not in file */
4774 	}
4775 
4776 	s->selected_line = 1;
4777 	s->first_displayed_line = i;
4778 }
4779 
4780 static void
4781 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4782 {
4783 	int start, i;
4784 
4785 	i = start = s->first_displayed_line + 1;
4786 
4787 	while (s->lines[i].type != type) {
4788 		if (i == s->nlines - 1)
4789 			i = 0;
4790 		if (++i == start)
4791 			return; /* do nothing, requested type not in file */
4792 	}
4793 
4794 	s->selected_line = 1;
4795 	s->first_displayed_line = i;
4796 }
4797 
4798 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
4799     int, int, int);
4800 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
4801     int, int);
4802 
4803 static const struct got_error *
4804 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
4805 {
4806 	const struct got_error *err = NULL;
4807 	struct tog_diff_view_state *s = &view->state.diff;
4808 	struct tog_log_view_state *ls;
4809 	struct commit_queue_entry *old_selected_entry;
4810 	char *line = NULL;
4811 	size_t linesize = 0;
4812 	ssize_t linelen;
4813 	int i, nscroll = view->nlines - 1, up = 0;
4814 
4815 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
4816 
4817 	switch (ch) {
4818 	case '0':
4819 		view->x = 0;
4820 		break;
4821 	case '$':
4822 		view->x = MAX(view->maxx - view->ncols / 3, 0);
4823 		view->count = 0;
4824 		break;
4825 	case KEY_RIGHT:
4826 	case 'l':
4827 		if (view->x + view->ncols / 3 < view->maxx)
4828 			view->x += 2;  /* move two columns right */
4829 		else
4830 			view->count = 0;
4831 		break;
4832 	case KEY_LEFT:
4833 	case 'h':
4834 		view->x -= MIN(view->x, 2);  /* move two columns back */
4835 		if (view->x <= 0)
4836 			view->count = 0;
4837 		break;
4838 	case 'a':
4839 	case 'w':
4840 		if (ch == 'a')
4841 			s->force_text_diff = !s->force_text_diff;
4842 		if (ch == 'w')
4843 			s->ignore_whitespace = !s->ignore_whitespace;
4844 		err = reset_diff_view(view);
4845 		break;
4846 	case 'g':
4847 	case KEY_HOME:
4848 		s->first_displayed_line = 1;
4849 		view->count = 0;
4850 		break;
4851 	case 'G':
4852 	case KEY_END:
4853 		view->count = 0;
4854 		if (s->eof)
4855 			break;
4856 
4857 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
4858 		s->eof = 1;
4859 		break;
4860 	case 'k':
4861 	case KEY_UP:
4862 	case CTRL('p'):
4863 		if (s->first_displayed_line > 1)
4864 			s->first_displayed_line--;
4865 		else
4866 			view->count = 0;
4867 		break;
4868 	case CTRL('u'):
4869 	case 'u':
4870 		nscroll /= 2;
4871 		/* FALL THROUGH */
4872 	case KEY_PPAGE:
4873 	case CTRL('b'):
4874 	case 'b':
4875 		if (s->first_displayed_line == 1) {
4876 			view->count = 0;
4877 			break;
4878 		}
4879 		i = 0;
4880 		while (i++ < nscroll && s->first_displayed_line > 1)
4881 			s->first_displayed_line--;
4882 		break;
4883 	case 'j':
4884 	case KEY_DOWN:
4885 	case CTRL('n'):
4886 		if (!s->eof)
4887 			s->first_displayed_line++;
4888 		else
4889 			view->count = 0;
4890 		break;
4891 	case CTRL('d'):
4892 	case 'd':
4893 		nscroll /= 2;
4894 		/* FALL THROUGH */
4895 	case KEY_NPAGE:
4896 	case CTRL('f'):
4897 	case 'f':
4898 	case ' ':
4899 		if (s->eof) {
4900 			view->count = 0;
4901 			break;
4902 		}
4903 		i = 0;
4904 		while (!s->eof && i++ < nscroll) {
4905 			linelen = getline(&line, &linesize, s->f);
4906 			s->first_displayed_line++;
4907 			if (linelen == -1) {
4908 				if (feof(s->f)) {
4909 					s->eof = 1;
4910 				} else
4911 					err = got_ferror(s->f, GOT_ERR_IO);
4912 				break;
4913 			}
4914 		}
4915 		free(line);
4916 		break;
4917 	case '(':
4918 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
4919 		break;
4920 	case ')':
4921 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
4922 		break;
4923 	case '{':
4924 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
4925 		break;
4926 	case '}':
4927 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
4928 		break;
4929 	case '[':
4930 		if (s->diff_context > 0) {
4931 			s->diff_context--;
4932 			s->matched_line = 0;
4933 			diff_view_indicate_progress(view);
4934 			err = create_diff(s);
4935 			if (s->first_displayed_line + view->nlines - 1 >
4936 			    s->nlines) {
4937 				s->first_displayed_line = 1;
4938 				s->last_displayed_line = view->nlines;
4939 			}
4940 		} else
4941 			view->count = 0;
4942 		break;
4943 	case ']':
4944 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
4945 			s->diff_context++;
4946 			s->matched_line = 0;
4947 			diff_view_indicate_progress(view);
4948 			err = create_diff(s);
4949 		} else
4950 			view->count = 0;
4951 		break;
4952 	case '<':
4953 	case ',':
4954 	case 'K':
4955 		up = 1;
4956 		/* FALL THROUGH */
4957 	case '>':
4958 	case '.':
4959 	case 'J':
4960 		if (s->parent_view == NULL) {
4961 			view->count = 0;
4962 			break;
4963 		}
4964 		s->parent_view->count = view->count;
4965 
4966 		if (s->parent_view->type == TOG_VIEW_LOG) {
4967 			ls = &s->parent_view->state.log;
4968 			old_selected_entry = ls->selected_entry;
4969 
4970 			err = input_log_view(NULL, s->parent_view,
4971 			    up ? KEY_UP : KEY_DOWN);
4972 			if (err)
4973 				break;
4974 			view->count = s->parent_view->count;
4975 
4976 			if (old_selected_entry == ls->selected_entry)
4977 				break;
4978 
4979 			err = set_selected_commit(s, ls->selected_entry);
4980 			if (err)
4981 				break;
4982 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
4983 			struct tog_blame_view_state *bs;
4984 			struct got_object_id *id, *prev_id;
4985 
4986 			bs = &s->parent_view->state.blame;
4987 			prev_id = get_annotation_for_line(bs->blame.lines,
4988 			    bs->blame.nlines, bs->last_diffed_line);
4989 
4990 			err = input_blame_view(&view, s->parent_view,
4991 			    up ? KEY_UP : KEY_DOWN);
4992 			if (err)
4993 				break;
4994 			view->count = s->parent_view->count;
4995 
4996 			if (prev_id == NULL)
4997 				break;
4998 			id = get_selected_commit_id(bs->blame.lines,
4999 			    bs->blame.nlines, bs->first_displayed_line,
5000 			    bs->selected_line);
5001 			if (id == NULL)
5002 				break;
5003 
5004 			if (!got_object_id_cmp(prev_id, id))
5005 				break;
5006 
5007 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5008 			if (err)
5009 				break;
5010 		}
5011 		s->first_displayed_line = 1;
5012 		s->last_displayed_line = view->nlines;
5013 		s->matched_line = 0;
5014 		view->x = 0;
5015 
5016 		diff_view_indicate_progress(view);
5017 		err = create_diff(s);
5018 		break;
5019 	default:
5020 		view->count = 0;
5021 		break;
5022 	}
5023 
5024 	return err;
5025 }
5026 
5027 static const struct got_error *
5028 cmd_diff(int argc, char *argv[])
5029 {
5030 	const struct got_error *error = NULL;
5031 	struct got_repository *repo = NULL;
5032 	struct got_worktree *worktree = NULL;
5033 	struct got_object_id *id1 = NULL, *id2 = NULL;
5034 	char *repo_path = NULL, *cwd = NULL;
5035 	char *id_str1 = NULL, *id_str2 = NULL;
5036 	char *label1 = NULL, *label2 = NULL;
5037 	int diff_context = 3, ignore_whitespace = 0;
5038 	int ch, force_text_diff = 0;
5039 	const char *errstr;
5040 	struct tog_view *view;
5041 	int *pack_fds = NULL;
5042 
5043 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5044 		switch (ch) {
5045 		case 'a':
5046 			force_text_diff = 1;
5047 			break;
5048 		case 'C':
5049 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5050 			    &errstr);
5051 			if (errstr != NULL)
5052 				errx(1, "number of context lines is %s: %s",
5053 				    errstr, errstr);
5054 			break;
5055 		case 'r':
5056 			repo_path = realpath(optarg, NULL);
5057 			if (repo_path == NULL)
5058 				return got_error_from_errno2("realpath",
5059 				    optarg);
5060 			got_path_strip_trailing_slashes(repo_path);
5061 			break;
5062 		case 'w':
5063 			ignore_whitespace = 1;
5064 			break;
5065 		default:
5066 			usage_diff();
5067 			/* NOTREACHED */
5068 		}
5069 	}
5070 
5071 	argc -= optind;
5072 	argv += optind;
5073 
5074 	if (argc == 0) {
5075 		usage_diff(); /* TODO show local worktree changes */
5076 	} else if (argc == 2) {
5077 		id_str1 = argv[0];
5078 		id_str2 = argv[1];
5079 	} else
5080 		usage_diff();
5081 
5082 	error = got_repo_pack_fds_open(&pack_fds);
5083 	if (error)
5084 		goto done;
5085 
5086 	if (repo_path == NULL) {
5087 		cwd = getcwd(NULL, 0);
5088 		if (cwd == NULL)
5089 			return got_error_from_errno("getcwd");
5090 		error = got_worktree_open(&worktree, cwd);
5091 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5092 			goto done;
5093 		if (worktree)
5094 			repo_path =
5095 			    strdup(got_worktree_get_repo_path(worktree));
5096 		else
5097 			repo_path = strdup(cwd);
5098 		if (repo_path == NULL) {
5099 			error = got_error_from_errno("strdup");
5100 			goto done;
5101 		}
5102 	}
5103 
5104 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5105 	if (error)
5106 		goto done;
5107 
5108 	init_curses();
5109 
5110 	error = apply_unveil(got_repo_get_path(repo), NULL);
5111 	if (error)
5112 		goto done;
5113 
5114 	error = tog_load_refs(repo, 0);
5115 	if (error)
5116 		goto done;
5117 
5118 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5119 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5120 	if (error)
5121 		goto done;
5122 
5123 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5124 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5125 	if (error)
5126 		goto done;
5127 
5128 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5129 	if (view == NULL) {
5130 		error = got_error_from_errno("view_open");
5131 		goto done;
5132 	}
5133 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5134 	    ignore_whitespace, force_text_diff, NULL,  repo);
5135 	if (error)
5136 		goto done;
5137 	error = view_loop(view);
5138 done:
5139 	free(label1);
5140 	free(label2);
5141 	free(repo_path);
5142 	free(cwd);
5143 	if (repo) {
5144 		const struct got_error *close_err = got_repo_close(repo);
5145 		if (error == NULL)
5146 			error = close_err;
5147 	}
5148 	if (worktree)
5149 		got_worktree_close(worktree);
5150 	if (pack_fds) {
5151 		const struct got_error *pack_err =
5152 		    got_repo_pack_fds_close(pack_fds);
5153 		if (error == NULL)
5154 			error = pack_err;
5155 	}
5156 	tog_free_refs();
5157 	return error;
5158 }
5159 
5160 __dead static void
5161 usage_blame(void)
5162 {
5163 	endwin();
5164 	fprintf(stderr,
5165 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5166 	    getprogname());
5167 	exit(1);
5168 }
5169 
5170 struct tog_blame_line {
5171 	int annotated;
5172 	struct got_object_id *id;
5173 };
5174 
5175 static const struct got_error *
5176 draw_blame(struct tog_view *view)
5177 {
5178 	struct tog_blame_view_state *s = &view->state.blame;
5179 	struct tog_blame *blame = &s->blame;
5180 	regmatch_t *regmatch = &view->regmatch;
5181 	const struct got_error *err;
5182 	int lineno = 0, nprinted = 0;
5183 	char *line = NULL;
5184 	size_t linesize = 0;
5185 	ssize_t linelen;
5186 	wchar_t *wline;
5187 	int width;
5188 	struct tog_blame_line *blame_line;
5189 	struct got_object_id *prev_id = NULL;
5190 	char *id_str;
5191 	struct tog_color *tc;
5192 
5193 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5194 	if (err)
5195 		return err;
5196 
5197 	rewind(blame->f);
5198 	werase(view->window);
5199 
5200 	if (asprintf(&line, "commit %s", id_str) == -1) {
5201 		err = got_error_from_errno("asprintf");
5202 		free(id_str);
5203 		return err;
5204 	}
5205 
5206 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5207 	free(line);
5208 	line = NULL;
5209 	if (err)
5210 		return err;
5211 	if (view_needs_focus_indication(view))
5212 		wstandout(view->window);
5213 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5214 	if (tc)
5215 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5216 	waddwstr(view->window, wline);
5217 	while (width++ < view->ncols)
5218 		waddch(view->window, ' ');
5219 	if (tc)
5220 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5221 	if (view_needs_focus_indication(view))
5222 		wstandend(view->window);
5223 	free(wline);
5224 	wline = NULL;
5225 
5226 	if (view->gline > blame->nlines)
5227 		view->gline = blame->nlines;
5228 
5229 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5230 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5231 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5232 		free(id_str);
5233 		return got_error_from_errno("asprintf");
5234 	}
5235 	free(id_str);
5236 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5237 	free(line);
5238 	line = NULL;
5239 	if (err)
5240 		return err;
5241 	waddwstr(view->window, wline);
5242 	free(wline);
5243 	wline = NULL;
5244 	if (width < view->ncols - 1)
5245 		waddch(view->window, '\n');
5246 
5247 	s->eof = 0;
5248 	view->maxx = 0;
5249 	while (nprinted < view->nlines - 2) {
5250 		linelen = getline(&line, &linesize, blame->f);
5251 		if (linelen == -1) {
5252 			if (feof(blame->f)) {
5253 				s->eof = 1;
5254 				break;
5255 			}
5256 			free(line);
5257 			return got_ferror(blame->f, GOT_ERR_IO);
5258 		}
5259 		if (++lineno < s->first_displayed_line)
5260 			continue;
5261 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5262 			continue;
5263 
5264 		/* Set view->maxx based on full line length. */
5265 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5266 		if (err) {
5267 			free(line);
5268 			return err;
5269 		}
5270 		free(wline);
5271 		wline = NULL;
5272 		view->maxx = MAX(view->maxx, width);
5273 
5274 		if (nprinted == s->selected_line - 1)
5275 			wstandout(view->window);
5276 
5277 		if (blame->nlines > 0) {
5278 			blame_line = &blame->lines[lineno - 1];
5279 			if (blame_line->annotated && prev_id &&
5280 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5281 			    !(nprinted == s->selected_line - 1)) {
5282 				waddstr(view->window, "        ");
5283 			} else if (blame_line->annotated) {
5284 				char *id_str;
5285 				err = got_object_id_str(&id_str,
5286 				    blame_line->id);
5287 				if (err) {
5288 					free(line);
5289 					return err;
5290 				}
5291 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5292 				if (tc)
5293 					wattr_on(view->window,
5294 					    COLOR_PAIR(tc->colorpair), NULL);
5295 				wprintw(view->window, "%.8s", id_str);
5296 				if (tc)
5297 					wattr_off(view->window,
5298 					    COLOR_PAIR(tc->colorpair), NULL);
5299 				free(id_str);
5300 				prev_id = blame_line->id;
5301 			} else {
5302 				waddstr(view->window, "........");
5303 				prev_id = NULL;
5304 			}
5305 		} else {
5306 			waddstr(view->window, "........");
5307 			prev_id = NULL;
5308 		}
5309 
5310 		if (nprinted == s->selected_line - 1)
5311 			wstandend(view->window);
5312 		waddstr(view->window, " ");
5313 
5314 		if (view->ncols <= 9) {
5315 			width = 9;
5316 		} else if (s->first_displayed_line + nprinted ==
5317 		    s->matched_line &&
5318 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5319 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5320 			    view->window, view->x, regmatch);
5321 			if (err) {
5322 				free(line);
5323 				return err;
5324 			}
5325 			width += 9;
5326 		} else {
5327 			int skip;
5328 			err = format_line(&wline, &width, &skip, line,
5329 			    view->x, view->ncols - 9, 9, 1);
5330 			if (err) {
5331 				free(line);
5332 				return err;
5333 			}
5334 			waddwstr(view->window, &wline[skip]);
5335 			width += 9;
5336 			free(wline);
5337 			wline = NULL;
5338 		}
5339 
5340 		if (width <= view->ncols - 1)
5341 			waddch(view->window, '\n');
5342 		if (++nprinted == 1)
5343 			s->first_displayed_line = lineno;
5344 	}
5345 	free(line);
5346 	s->last_displayed_line = lineno;
5347 
5348 	view_border(view);
5349 
5350 	return NULL;
5351 }
5352 
5353 static const struct got_error *
5354 blame_cb(void *arg, int nlines, int lineno,
5355     struct got_commit_object *commit, struct got_object_id *id)
5356 {
5357 	const struct got_error *err = NULL;
5358 	struct tog_blame_cb_args *a = arg;
5359 	struct tog_blame_line *line;
5360 	int errcode;
5361 
5362 	if (nlines != a->nlines ||
5363 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5364 		return got_error(GOT_ERR_RANGE);
5365 
5366 	errcode = pthread_mutex_lock(&tog_mutex);
5367 	if (errcode)
5368 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5369 
5370 	if (*a->quit) {	/* user has quit the blame view */
5371 		err = got_error(GOT_ERR_ITER_COMPLETED);
5372 		goto done;
5373 	}
5374 
5375 	if (lineno == -1)
5376 		goto done; /* no change in this commit */
5377 
5378 	line = &a->lines[lineno - 1];
5379 	if (line->annotated)
5380 		goto done;
5381 
5382 	line->id = got_object_id_dup(id);
5383 	if (line->id == NULL) {
5384 		err = got_error_from_errno("got_object_id_dup");
5385 		goto done;
5386 	}
5387 	line->annotated = 1;
5388 done:
5389 	errcode = pthread_mutex_unlock(&tog_mutex);
5390 	if (errcode)
5391 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5392 	return err;
5393 }
5394 
5395 static void *
5396 blame_thread(void *arg)
5397 {
5398 	const struct got_error *err, *close_err;
5399 	struct tog_blame_thread_args *ta = arg;
5400 	struct tog_blame_cb_args *a = ta->cb_args;
5401 	int errcode, fd1 = -1, fd2 = -1;
5402 	FILE *f1 = NULL, *f2 = NULL;
5403 
5404 	fd1 = got_opentempfd();
5405 	if (fd1 == -1)
5406 		return (void *)got_error_from_errno("got_opentempfd");
5407 
5408 	fd2 = got_opentempfd();
5409 	if (fd2 == -1) {
5410 		err = got_error_from_errno("got_opentempfd");
5411 		goto done;
5412 	}
5413 
5414 	f1 = got_opentemp();
5415 	if (f1 == NULL) {
5416 		err = (void *)got_error_from_errno("got_opentemp");
5417 		goto done;
5418 	}
5419 	f2 = got_opentemp();
5420 	if (f2 == NULL) {
5421 		err = (void *)got_error_from_errno("got_opentemp");
5422 		goto done;
5423 	}
5424 
5425 	err = block_signals_used_by_main_thread();
5426 	if (err)
5427 		goto done;
5428 
5429 	err = got_blame(ta->path, a->commit_id, ta->repo,
5430 	    tog_diff_algo, blame_cb, ta->cb_args,
5431 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5432 	if (err && err->code == GOT_ERR_CANCELLED)
5433 		err = NULL;
5434 
5435 	errcode = pthread_mutex_lock(&tog_mutex);
5436 	if (errcode) {
5437 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5438 		goto done;
5439 	}
5440 
5441 	close_err = got_repo_close(ta->repo);
5442 	if (err == NULL)
5443 		err = close_err;
5444 	ta->repo = NULL;
5445 	*ta->complete = 1;
5446 
5447 	errcode = pthread_mutex_unlock(&tog_mutex);
5448 	if (errcode && err == NULL)
5449 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5450 
5451 done:
5452 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5453 		err = got_error_from_errno("close");
5454 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5455 		err = got_error_from_errno("close");
5456 	if (f1 && fclose(f1) == EOF && err == NULL)
5457 		err = got_error_from_errno("fclose");
5458 	if (f2 && fclose(f2) == EOF && err == NULL)
5459 		err = got_error_from_errno("fclose");
5460 
5461 	return (void *)err;
5462 }
5463 
5464 static struct got_object_id *
5465 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5466     int first_displayed_line, int selected_line)
5467 {
5468 	struct tog_blame_line *line;
5469 
5470 	if (nlines <= 0)
5471 		return NULL;
5472 
5473 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5474 	if (!line->annotated)
5475 		return NULL;
5476 
5477 	return line->id;
5478 }
5479 
5480 static struct got_object_id *
5481 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5482     int lineno)
5483 {
5484 	struct tog_blame_line *line;
5485 
5486 	if (nlines <= 0 || lineno >= nlines)
5487 		return NULL;
5488 
5489 	line = &lines[lineno - 1];
5490 	if (!line->annotated)
5491 		return NULL;
5492 
5493 	return line->id;
5494 }
5495 
5496 static const struct got_error *
5497 stop_blame(struct tog_blame *blame)
5498 {
5499 	const struct got_error *err = NULL;
5500 	int i;
5501 
5502 	if (blame->thread) {
5503 		int errcode;
5504 		errcode = pthread_mutex_unlock(&tog_mutex);
5505 		if (errcode)
5506 			return got_error_set_errno(errcode,
5507 			    "pthread_mutex_unlock");
5508 		errcode = pthread_join(blame->thread, (void **)&err);
5509 		if (errcode)
5510 			return got_error_set_errno(errcode, "pthread_join");
5511 		errcode = pthread_mutex_lock(&tog_mutex);
5512 		if (errcode)
5513 			return got_error_set_errno(errcode,
5514 			    "pthread_mutex_lock");
5515 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5516 			err = NULL;
5517 		blame->thread = NULL;
5518 	}
5519 	if (blame->thread_args.repo) {
5520 		const struct got_error *close_err;
5521 		close_err = got_repo_close(blame->thread_args.repo);
5522 		if (err == NULL)
5523 			err = close_err;
5524 		blame->thread_args.repo = NULL;
5525 	}
5526 	if (blame->f) {
5527 		if (fclose(blame->f) == EOF && err == NULL)
5528 			err = got_error_from_errno("fclose");
5529 		blame->f = NULL;
5530 	}
5531 	if (blame->lines) {
5532 		for (i = 0; i < blame->nlines; i++)
5533 			free(blame->lines[i].id);
5534 		free(blame->lines);
5535 		blame->lines = NULL;
5536 	}
5537 	free(blame->cb_args.commit_id);
5538 	blame->cb_args.commit_id = NULL;
5539 	if (blame->pack_fds) {
5540 		const struct got_error *pack_err =
5541 		    got_repo_pack_fds_close(blame->pack_fds);
5542 		if (err == NULL)
5543 			err = pack_err;
5544 		blame->pack_fds = NULL;
5545 	}
5546 	return err;
5547 }
5548 
5549 static const struct got_error *
5550 cancel_blame_view(void *arg)
5551 {
5552 	const struct got_error *err = NULL;
5553 	int *done = arg;
5554 	int errcode;
5555 
5556 	errcode = pthread_mutex_lock(&tog_mutex);
5557 	if (errcode)
5558 		return got_error_set_errno(errcode,
5559 		    "pthread_mutex_unlock");
5560 
5561 	if (*done)
5562 		err = got_error(GOT_ERR_CANCELLED);
5563 
5564 	errcode = pthread_mutex_unlock(&tog_mutex);
5565 	if (errcode)
5566 		return got_error_set_errno(errcode,
5567 		    "pthread_mutex_lock");
5568 
5569 	return err;
5570 }
5571 
5572 static const struct got_error *
5573 run_blame(struct tog_view *view)
5574 {
5575 	struct tog_blame_view_state *s = &view->state.blame;
5576 	struct tog_blame *blame = &s->blame;
5577 	const struct got_error *err = NULL;
5578 	struct got_commit_object *commit = NULL;
5579 	struct got_blob_object *blob = NULL;
5580 	struct got_repository *thread_repo = NULL;
5581 	struct got_object_id *obj_id = NULL;
5582 	int obj_type, fd = -1;
5583 	int *pack_fds = NULL;
5584 
5585 	err = got_object_open_as_commit(&commit, s->repo,
5586 	    &s->blamed_commit->id);
5587 	if (err)
5588 		return err;
5589 
5590 	fd = got_opentempfd();
5591 	if (fd == -1) {
5592 		err = got_error_from_errno("got_opentempfd");
5593 		goto done;
5594 	}
5595 
5596 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5597 	if (err)
5598 		goto done;
5599 
5600 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5601 	if (err)
5602 		goto done;
5603 
5604 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5605 		err = got_error(GOT_ERR_OBJ_TYPE);
5606 		goto done;
5607 	}
5608 
5609 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5610 	if (err)
5611 		goto done;
5612 	blame->f = got_opentemp();
5613 	if (blame->f == NULL) {
5614 		err = got_error_from_errno("got_opentemp");
5615 		goto done;
5616 	}
5617 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5618 	    &blame->line_offsets, blame->f, blob);
5619 	if (err)
5620 		goto done;
5621 	if (blame->nlines == 0) {
5622 		s->blame_complete = 1;
5623 		goto done;
5624 	}
5625 
5626 	/* Don't include \n at EOF in the blame line count. */
5627 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5628 		blame->nlines--;
5629 
5630 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5631 	if (blame->lines == NULL) {
5632 		err = got_error_from_errno("calloc");
5633 		goto done;
5634 	}
5635 
5636 	err = got_repo_pack_fds_open(&pack_fds);
5637 	if (err)
5638 		goto done;
5639 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5640 	    pack_fds);
5641 	if (err)
5642 		goto done;
5643 
5644 	blame->pack_fds = pack_fds;
5645 	blame->cb_args.view = view;
5646 	blame->cb_args.lines = blame->lines;
5647 	blame->cb_args.nlines = blame->nlines;
5648 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5649 	if (blame->cb_args.commit_id == NULL) {
5650 		err = got_error_from_errno("got_object_id_dup");
5651 		goto done;
5652 	}
5653 	blame->cb_args.quit = &s->done;
5654 
5655 	blame->thread_args.path = s->path;
5656 	blame->thread_args.repo = thread_repo;
5657 	blame->thread_args.cb_args = &blame->cb_args;
5658 	blame->thread_args.complete = &s->blame_complete;
5659 	blame->thread_args.cancel_cb = cancel_blame_view;
5660 	blame->thread_args.cancel_arg = &s->done;
5661 	s->blame_complete = 0;
5662 
5663 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5664 		s->first_displayed_line = 1;
5665 		s->last_displayed_line = view->nlines;
5666 		s->selected_line = 1;
5667 	}
5668 	s->matched_line = 0;
5669 
5670 done:
5671 	if (commit)
5672 		got_object_commit_close(commit);
5673 	if (fd != -1 && close(fd) == -1 && err == NULL)
5674 		err = got_error_from_errno("close");
5675 	if (blob)
5676 		got_object_blob_close(blob);
5677 	free(obj_id);
5678 	if (err)
5679 		stop_blame(blame);
5680 	return err;
5681 }
5682 
5683 static const struct got_error *
5684 open_blame_view(struct tog_view *view, char *path,
5685     struct got_object_id *commit_id, struct got_repository *repo)
5686 {
5687 	const struct got_error *err = NULL;
5688 	struct tog_blame_view_state *s = &view->state.blame;
5689 
5690 	STAILQ_INIT(&s->blamed_commits);
5691 
5692 	s->path = strdup(path);
5693 	if (s->path == NULL)
5694 		return got_error_from_errno("strdup");
5695 
5696 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5697 	if (err) {
5698 		free(s->path);
5699 		return err;
5700 	}
5701 
5702 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5703 	s->first_displayed_line = 1;
5704 	s->last_displayed_line = view->nlines;
5705 	s->selected_line = 1;
5706 	s->blame_complete = 0;
5707 	s->repo = repo;
5708 	s->commit_id = commit_id;
5709 	memset(&s->blame, 0, sizeof(s->blame));
5710 
5711 	STAILQ_INIT(&s->colors);
5712 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5713 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5714 		    get_color_value("TOG_COLOR_COMMIT"));
5715 		if (err)
5716 			return err;
5717 	}
5718 
5719 	view->show = show_blame_view;
5720 	view->input = input_blame_view;
5721 	view->reset = reset_blame_view;
5722 	view->close = close_blame_view;
5723 	view->search_start = search_start_blame_view;
5724 	view->search_next = search_next_blame_view;
5725 
5726 	return run_blame(view);
5727 }
5728 
5729 static const struct got_error *
5730 close_blame_view(struct tog_view *view)
5731 {
5732 	const struct got_error *err = NULL;
5733 	struct tog_blame_view_state *s = &view->state.blame;
5734 
5735 	if (s->blame.thread)
5736 		err = stop_blame(&s->blame);
5737 
5738 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5739 		struct got_object_qid *blamed_commit;
5740 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5741 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5742 		got_object_qid_free(blamed_commit);
5743 	}
5744 
5745 	free(s->path);
5746 	free_colors(&s->colors);
5747 	return err;
5748 }
5749 
5750 static const struct got_error *
5751 search_start_blame_view(struct tog_view *view)
5752 {
5753 	struct tog_blame_view_state *s = &view->state.blame;
5754 
5755 	s->matched_line = 0;
5756 	return NULL;
5757 }
5758 
5759 static const struct got_error *
5760 search_next_blame_view(struct tog_view *view)
5761 {
5762 	struct tog_blame_view_state *s = &view->state.blame;
5763 	const struct got_error *err = NULL;
5764 	int lineno;
5765 	char *line = NULL;
5766 	size_t linesize = 0;
5767 	ssize_t linelen;
5768 
5769 	if (!view->searching) {
5770 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5771 		return NULL;
5772 	}
5773 
5774 	if (s->matched_line) {
5775 		if (view->searching == TOG_SEARCH_FORWARD)
5776 			lineno = s->matched_line + 1;
5777 		else
5778 			lineno = s->matched_line - 1;
5779 	} else
5780 		lineno = s->first_displayed_line - 1 + s->selected_line;
5781 
5782 	while (1) {
5783 		off_t offset;
5784 
5785 		if (lineno <= 0 || lineno > s->blame.nlines) {
5786 			if (s->matched_line == 0) {
5787 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5788 				break;
5789 			}
5790 
5791 			if (view->searching == TOG_SEARCH_FORWARD)
5792 				lineno = 1;
5793 			else
5794 				lineno = s->blame.nlines;
5795 		}
5796 
5797 		offset = s->blame.line_offsets[lineno - 1];
5798 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
5799 			free(line);
5800 			return got_error_from_errno("fseeko");
5801 		}
5802 		linelen = getline(&line, &linesize, s->blame.f);
5803 		if (linelen != -1) {
5804 			char *exstr;
5805 			err = expand_tab(&exstr, line);
5806 			if (err)
5807 				break;
5808 			if (match_line(exstr, &view->regex, 1,
5809 			    &view->regmatch)) {
5810 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
5811 				s->matched_line = lineno;
5812 				free(exstr);
5813 				break;
5814 			}
5815 			free(exstr);
5816 		}
5817 		if (view->searching == TOG_SEARCH_FORWARD)
5818 			lineno++;
5819 		else
5820 			lineno--;
5821 	}
5822 	free(line);
5823 
5824 	if (s->matched_line) {
5825 		s->first_displayed_line = s->matched_line;
5826 		s->selected_line = 1;
5827 	}
5828 
5829 	return err;
5830 }
5831 
5832 static const struct got_error *
5833 show_blame_view(struct tog_view *view)
5834 {
5835 	const struct got_error *err = NULL;
5836 	struct tog_blame_view_state *s = &view->state.blame;
5837 	int errcode;
5838 
5839 	if (s->blame.thread == NULL && !s->blame_complete) {
5840 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
5841 		    &s->blame.thread_args);
5842 		if (errcode)
5843 			return got_error_set_errno(errcode, "pthread_create");
5844 
5845 		halfdelay(1); /* fast refresh while annotating  */
5846 	}
5847 
5848 	if (s->blame_complete)
5849 		halfdelay(10); /* disable fast refresh */
5850 
5851 	err = draw_blame(view);
5852 
5853 	view_border(view);
5854 	return err;
5855 }
5856 
5857 static const struct got_error *
5858 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
5859     struct got_repository *repo, struct got_object_id *id)
5860 {
5861 	struct tog_view		*log_view;
5862 	const struct got_error	*err = NULL;
5863 
5864 	*new_view = NULL;
5865 
5866 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
5867 	if (log_view == NULL)
5868 		return got_error_from_errno("view_open");
5869 
5870 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
5871 	if (err)
5872 		view_close(log_view);
5873 	else
5874 		*new_view = log_view;
5875 
5876 	return err;
5877 }
5878 
5879 static const struct got_error *
5880 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
5881 {
5882 	const struct got_error *err = NULL, *thread_err = NULL;
5883 	struct tog_view *diff_view;
5884 	struct tog_blame_view_state *s = &view->state.blame;
5885 	int eos, nscroll, begin_y = 0, begin_x = 0;
5886 
5887 	eos = nscroll = view->nlines - 2;
5888 	if (view_is_hsplit_top(view))
5889 		--eos;  /* border */
5890 
5891 	switch (ch) {
5892 	case '0':
5893 		view->x = 0;
5894 		break;
5895 	case '$':
5896 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5897 		view->count = 0;
5898 		break;
5899 	case KEY_RIGHT:
5900 	case 'l':
5901 		if (view->x + view->ncols / 3 < view->maxx)
5902 			view->x += 2;  /* move two columns right */
5903 		else
5904 			view->count = 0;
5905 		break;
5906 	case KEY_LEFT:
5907 	case 'h':
5908 		view->x -= MIN(view->x, 2);  /* move two columns back */
5909 		if (view->x <= 0)
5910 			view->count = 0;
5911 		break;
5912 	case 'q':
5913 		s->done = 1;
5914 		break;
5915 	case 'g':
5916 	case KEY_HOME:
5917 		s->selected_line = 1;
5918 		s->first_displayed_line = 1;
5919 		view->count = 0;
5920 		break;
5921 	case 'G':
5922 	case KEY_END:
5923 		if (s->blame.nlines < eos) {
5924 			s->selected_line = s->blame.nlines;
5925 			s->first_displayed_line = 1;
5926 		} else {
5927 			s->selected_line = eos;
5928 			s->first_displayed_line = s->blame.nlines - (eos - 1);
5929 		}
5930 		view->count = 0;
5931 		break;
5932 	case 'k':
5933 	case KEY_UP:
5934 	case CTRL('p'):
5935 		if (s->selected_line > 1)
5936 			s->selected_line--;
5937 		else if (s->selected_line == 1 &&
5938 		    s->first_displayed_line > 1)
5939 			s->first_displayed_line--;
5940 		else
5941 			view->count = 0;
5942 		break;
5943 	case CTRL('u'):
5944 	case 'u':
5945 		nscroll /= 2;
5946 		/* FALL THROUGH */
5947 	case KEY_PPAGE:
5948 	case CTRL('b'):
5949 	case 'b':
5950 		if (s->first_displayed_line == 1) {
5951 			if (view->count > 1)
5952 				nscroll += nscroll;
5953 			s->selected_line = MAX(1, s->selected_line - nscroll);
5954 			view->count = 0;
5955 			break;
5956 		}
5957 		if (s->first_displayed_line > nscroll)
5958 			s->first_displayed_line -= nscroll;
5959 		else
5960 			s->first_displayed_line = 1;
5961 		break;
5962 	case 'j':
5963 	case KEY_DOWN:
5964 	case CTRL('n'):
5965 		if (s->selected_line < eos && s->first_displayed_line +
5966 		    s->selected_line <= s->blame.nlines)
5967 			s->selected_line++;
5968 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
5969 			s->first_displayed_line++;
5970 		else
5971 			view->count = 0;
5972 		break;
5973 	case 'c':
5974 	case 'p': {
5975 		struct got_object_id *id = NULL;
5976 
5977 		view->count = 0;
5978 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
5979 		    s->first_displayed_line, s->selected_line);
5980 		if (id == NULL)
5981 			break;
5982 		if (ch == 'p') {
5983 			struct got_commit_object *commit, *pcommit;
5984 			struct got_object_qid *pid;
5985 			struct got_object_id *blob_id = NULL;
5986 			int obj_type;
5987 			err = got_object_open_as_commit(&commit,
5988 			    s->repo, id);
5989 			if (err)
5990 				break;
5991 			pid = STAILQ_FIRST(
5992 			    got_object_commit_get_parent_ids(commit));
5993 			if (pid == NULL) {
5994 				got_object_commit_close(commit);
5995 				break;
5996 			}
5997 			/* Check if path history ends here. */
5998 			err = got_object_open_as_commit(&pcommit,
5999 			    s->repo, &pid->id);
6000 			if (err)
6001 				break;
6002 			err = got_object_id_by_path(&blob_id, s->repo,
6003 			    pcommit, s->path);
6004 			got_object_commit_close(pcommit);
6005 			if (err) {
6006 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6007 					err = NULL;
6008 				got_object_commit_close(commit);
6009 				break;
6010 			}
6011 			err = got_object_get_type(&obj_type, s->repo,
6012 			    blob_id);
6013 			free(blob_id);
6014 			/* Can't blame non-blob type objects. */
6015 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6016 				got_object_commit_close(commit);
6017 				break;
6018 			}
6019 			err = got_object_qid_alloc(&s->blamed_commit,
6020 			    &pid->id);
6021 			got_object_commit_close(commit);
6022 		} else {
6023 			if (got_object_id_cmp(id,
6024 			    &s->blamed_commit->id) == 0)
6025 				break;
6026 			err = got_object_qid_alloc(&s->blamed_commit,
6027 			    id);
6028 		}
6029 		if (err)
6030 			break;
6031 		s->done = 1;
6032 		thread_err = stop_blame(&s->blame);
6033 		s->done = 0;
6034 		if (thread_err)
6035 			break;
6036 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6037 		    s->blamed_commit, entry);
6038 		err = run_blame(view);
6039 		if (err)
6040 			break;
6041 		break;
6042 	}
6043 	case 'C': {
6044 		struct got_object_qid *first;
6045 
6046 		view->count = 0;
6047 		first = STAILQ_FIRST(&s->blamed_commits);
6048 		if (!got_object_id_cmp(&first->id, s->commit_id))
6049 			break;
6050 		s->done = 1;
6051 		thread_err = stop_blame(&s->blame);
6052 		s->done = 0;
6053 		if (thread_err)
6054 			break;
6055 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6056 		got_object_qid_free(s->blamed_commit);
6057 		s->blamed_commit =
6058 		    STAILQ_FIRST(&s->blamed_commits);
6059 		err = run_blame(view);
6060 		if (err)
6061 			break;
6062 		break;
6063 	}
6064 	case 'L':
6065 		view->count = 0;
6066 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6067 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6068 		if (s->id_to_log)
6069 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6070 		break;
6071 	case KEY_ENTER:
6072 	case '\r': {
6073 		struct got_object_id *id = NULL;
6074 		struct got_object_qid *pid;
6075 		struct got_commit_object *commit = NULL;
6076 
6077 		view->count = 0;
6078 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6079 		    s->first_displayed_line, s->selected_line);
6080 		if (id == NULL)
6081 			break;
6082 		err = got_object_open_as_commit(&commit, s->repo, id);
6083 		if (err)
6084 			break;
6085 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6086 		if (*new_view) {
6087 			/* traversed from diff view, release diff resources  */
6088 			err = close_diff_view(*new_view);
6089 			if (err)
6090 				break;
6091 			diff_view = *new_view;
6092 		} else {
6093 			if (view_is_parent_view(view))
6094 				view_get_split(view, &begin_y, &begin_x);
6095 
6096 			diff_view = view_open(0, 0, begin_y, begin_x,
6097 			    TOG_VIEW_DIFF);
6098 			if (diff_view == NULL) {
6099 				got_object_commit_close(commit);
6100 				err = got_error_from_errno("view_open");
6101 				break;
6102 			}
6103 		}
6104 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6105 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6106 		got_object_commit_close(commit);
6107 		if (err) {
6108 			view_close(diff_view);
6109 			break;
6110 		}
6111 		s->last_diffed_line = s->first_displayed_line - 1 +
6112 		    s->selected_line;
6113 		if (*new_view)
6114 			break;	/* still open from active diff view */
6115 		if (view_is_parent_view(view) &&
6116 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6117 			err = view_init_hsplit(view, begin_y);
6118 			if (err)
6119 				break;
6120 		}
6121 
6122 		view->focussed = 0;
6123 		diff_view->focussed = 1;
6124 		diff_view->mode = view->mode;
6125 		diff_view->nlines = view->lines - begin_y;
6126 		if (view_is_parent_view(view)) {
6127 			view_transfer_size(diff_view, view);
6128 			err = view_close_child(view);
6129 			if (err)
6130 				break;
6131 			err = view_set_child(view, diff_view);
6132 			if (err)
6133 				break;
6134 			view->focus_child = 1;
6135 		} else
6136 			*new_view = diff_view;
6137 		if (err)
6138 			break;
6139 		break;
6140 	}
6141 	case CTRL('d'):
6142 	case 'd':
6143 		nscroll /= 2;
6144 		/* FALL THROUGH */
6145 	case KEY_NPAGE:
6146 	case CTRL('f'):
6147 	case 'f':
6148 	case ' ':
6149 		if (s->last_displayed_line >= s->blame.nlines &&
6150 		    s->selected_line >= MIN(s->blame.nlines,
6151 		    view->nlines - 2)) {
6152 			view->count = 0;
6153 			break;
6154 		}
6155 		if (s->last_displayed_line >= s->blame.nlines &&
6156 		    s->selected_line < view->nlines - 2) {
6157 			s->selected_line +=
6158 			    MIN(nscroll, s->last_displayed_line -
6159 			    s->first_displayed_line - s->selected_line + 1);
6160 		}
6161 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6162 			s->first_displayed_line += nscroll;
6163 		else
6164 			s->first_displayed_line =
6165 			    s->blame.nlines - (view->nlines - 3);
6166 		break;
6167 	case KEY_RESIZE:
6168 		if (s->selected_line > view->nlines - 2) {
6169 			s->selected_line = MIN(s->blame.nlines,
6170 			    view->nlines - 2);
6171 		}
6172 		break;
6173 	default:
6174 		view->count = 0;
6175 		break;
6176 	}
6177 	return thread_err ? thread_err : err;
6178 }
6179 
6180 static const struct got_error *
6181 reset_blame_view(struct tog_view *view)
6182 {
6183 	const struct got_error *err;
6184 	struct tog_blame_view_state *s = &view->state.blame;
6185 
6186 	view->count = 0;
6187 	s->done = 1;
6188 	err = stop_blame(&s->blame);
6189 	s->done = 0;
6190 	if (err)
6191 		return err;
6192 	return run_blame(view);
6193 }
6194 
6195 static const struct got_error *
6196 cmd_blame(int argc, char *argv[])
6197 {
6198 	const struct got_error *error;
6199 	struct got_repository *repo = NULL;
6200 	struct got_worktree *worktree = NULL;
6201 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6202 	char *link_target = NULL;
6203 	struct got_object_id *commit_id = NULL;
6204 	struct got_commit_object *commit = NULL;
6205 	char *commit_id_str = NULL;
6206 	int ch;
6207 	struct tog_view *view;
6208 	int *pack_fds = NULL;
6209 
6210 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6211 		switch (ch) {
6212 		case 'c':
6213 			commit_id_str = optarg;
6214 			break;
6215 		case 'r':
6216 			repo_path = realpath(optarg, NULL);
6217 			if (repo_path == NULL)
6218 				return got_error_from_errno2("realpath",
6219 				    optarg);
6220 			break;
6221 		default:
6222 			usage_blame();
6223 			/* NOTREACHED */
6224 		}
6225 	}
6226 
6227 	argc -= optind;
6228 	argv += optind;
6229 
6230 	if (argc != 1)
6231 		usage_blame();
6232 
6233 	error = got_repo_pack_fds_open(&pack_fds);
6234 	if (error != NULL)
6235 		goto done;
6236 
6237 	if (repo_path == NULL) {
6238 		cwd = getcwd(NULL, 0);
6239 		if (cwd == NULL)
6240 			return got_error_from_errno("getcwd");
6241 		error = got_worktree_open(&worktree, cwd);
6242 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6243 			goto done;
6244 		if (worktree)
6245 			repo_path =
6246 			    strdup(got_worktree_get_repo_path(worktree));
6247 		else
6248 			repo_path = strdup(cwd);
6249 		if (repo_path == NULL) {
6250 			error = got_error_from_errno("strdup");
6251 			goto done;
6252 		}
6253 	}
6254 
6255 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6256 	if (error != NULL)
6257 		goto done;
6258 
6259 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6260 	    worktree);
6261 	if (error)
6262 		goto done;
6263 
6264 	init_curses();
6265 
6266 	error = apply_unveil(got_repo_get_path(repo), NULL);
6267 	if (error)
6268 		goto done;
6269 
6270 	error = tog_load_refs(repo, 0);
6271 	if (error)
6272 		goto done;
6273 
6274 	if (commit_id_str == NULL) {
6275 		struct got_reference *head_ref;
6276 		error = got_ref_open(&head_ref, repo, worktree ?
6277 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6278 		if (error != NULL)
6279 			goto done;
6280 		error = got_ref_resolve(&commit_id, repo, head_ref);
6281 		got_ref_close(head_ref);
6282 	} else {
6283 		error = got_repo_match_object_id(&commit_id, NULL,
6284 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6285 	}
6286 	if (error != NULL)
6287 		goto done;
6288 
6289 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6290 	if (view == NULL) {
6291 		error = got_error_from_errno("view_open");
6292 		goto done;
6293 	}
6294 
6295 	error = got_object_open_as_commit(&commit, repo, commit_id);
6296 	if (error)
6297 		goto done;
6298 
6299 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6300 	    commit, repo);
6301 	if (error)
6302 		goto done;
6303 
6304 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6305 	    commit_id, repo);
6306 	if (error)
6307 		goto done;
6308 	if (worktree) {
6309 		/* Release work tree lock. */
6310 		got_worktree_close(worktree);
6311 		worktree = NULL;
6312 	}
6313 	error = view_loop(view);
6314 done:
6315 	free(repo_path);
6316 	free(in_repo_path);
6317 	free(link_target);
6318 	free(cwd);
6319 	free(commit_id);
6320 	if (commit)
6321 		got_object_commit_close(commit);
6322 	if (worktree)
6323 		got_worktree_close(worktree);
6324 	if (repo) {
6325 		const struct got_error *close_err = got_repo_close(repo);
6326 		if (error == NULL)
6327 			error = close_err;
6328 	}
6329 	if (pack_fds) {
6330 		const struct got_error *pack_err =
6331 		    got_repo_pack_fds_close(pack_fds);
6332 		if (error == NULL)
6333 			error = pack_err;
6334 	}
6335 	tog_free_refs();
6336 	return error;
6337 }
6338 
6339 static const struct got_error *
6340 draw_tree_entries(struct tog_view *view, const char *parent_path)
6341 {
6342 	struct tog_tree_view_state *s = &view->state.tree;
6343 	const struct got_error *err = NULL;
6344 	struct got_tree_entry *te;
6345 	wchar_t *wline;
6346 	char *index = NULL;
6347 	struct tog_color *tc;
6348 	int width, n, nentries, i = 1;
6349 	int limit = view->nlines;
6350 
6351 	s->ndisplayed = 0;
6352 	if (view_is_hsplit_top(view))
6353 		--limit;  /* border */
6354 
6355 	werase(view->window);
6356 
6357 	if (limit == 0)
6358 		return NULL;
6359 
6360 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6361 	    0, 0);
6362 	if (err)
6363 		return err;
6364 	if (view_needs_focus_indication(view))
6365 		wstandout(view->window);
6366 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6367 	if (tc)
6368 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6369 	waddwstr(view->window, wline);
6370 	free(wline);
6371 	wline = NULL;
6372 	while (width++ < view->ncols)
6373 		waddch(view->window, ' ');
6374 	if (tc)
6375 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6376 	if (view_needs_focus_indication(view))
6377 		wstandend(view->window);
6378 	if (--limit <= 0)
6379 		return NULL;
6380 
6381 	i += s->selected;
6382 	if (s->first_displayed_entry) {
6383 		i += got_tree_entry_get_index(s->first_displayed_entry);
6384 		if (s->tree != s->root)
6385 			++i;  /* account for ".." entry */
6386 	}
6387 	nentries = got_object_tree_get_nentries(s->tree);
6388 	if (asprintf(&index, "[%d/%d] %s",
6389 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6390 		return got_error_from_errno("asprintf");
6391 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6392 	free(index);
6393 	if (err)
6394 		return err;
6395 	waddwstr(view->window, wline);
6396 	free(wline);
6397 	wline = NULL;
6398 	if (width < view->ncols - 1)
6399 		waddch(view->window, '\n');
6400 	if (--limit <= 0)
6401 		return NULL;
6402 	waddch(view->window, '\n');
6403 	if (--limit <= 0)
6404 		return NULL;
6405 
6406 	if (s->first_displayed_entry == NULL) {
6407 		te = got_object_tree_get_first_entry(s->tree);
6408 		if (s->selected == 0) {
6409 			if (view->focussed)
6410 				wstandout(view->window);
6411 			s->selected_entry = NULL;
6412 		}
6413 		waddstr(view->window, "  ..\n");	/* parent directory */
6414 		if (s->selected == 0 && view->focussed)
6415 			wstandend(view->window);
6416 		s->ndisplayed++;
6417 		if (--limit <= 0)
6418 			return NULL;
6419 		n = 1;
6420 	} else {
6421 		n = 0;
6422 		te = s->first_displayed_entry;
6423 	}
6424 
6425 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6426 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6427 		const char *modestr = "";
6428 		mode_t mode;
6429 
6430 		te = got_object_tree_get_entry(s->tree, i);
6431 		mode = got_tree_entry_get_mode(te);
6432 
6433 		if (s->show_ids) {
6434 			err = got_object_id_str(&id_str,
6435 			    got_tree_entry_get_id(te));
6436 			if (err)
6437 				return got_error_from_errno(
6438 				    "got_object_id_str");
6439 		}
6440 		if (got_object_tree_entry_is_submodule(te))
6441 			modestr = "$";
6442 		else if (S_ISLNK(mode)) {
6443 			int i;
6444 
6445 			err = got_tree_entry_get_symlink_target(&link_target,
6446 			    te, s->repo);
6447 			if (err) {
6448 				free(id_str);
6449 				return err;
6450 			}
6451 			for (i = 0; i < strlen(link_target); i++) {
6452 				if (!isprint((unsigned char)link_target[i]))
6453 					link_target[i] = '?';
6454 			}
6455 			modestr = "@";
6456 		}
6457 		else if (S_ISDIR(mode))
6458 			modestr = "/";
6459 		else if (mode & S_IXUSR)
6460 			modestr = "*";
6461 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6462 		    got_tree_entry_get_name(te), modestr,
6463 		    link_target ? " -> ": "",
6464 		    link_target ? link_target : "") == -1) {
6465 			free(id_str);
6466 			free(link_target);
6467 			return got_error_from_errno("asprintf");
6468 		}
6469 		free(id_str);
6470 		free(link_target);
6471 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6472 		    0, 0);
6473 		if (err) {
6474 			free(line);
6475 			break;
6476 		}
6477 		if (n == s->selected) {
6478 			if (view->focussed)
6479 				wstandout(view->window);
6480 			s->selected_entry = te;
6481 		}
6482 		tc = match_color(&s->colors, line);
6483 		if (tc)
6484 			wattr_on(view->window,
6485 			    COLOR_PAIR(tc->colorpair), NULL);
6486 		waddwstr(view->window, wline);
6487 		if (tc)
6488 			wattr_off(view->window,
6489 			    COLOR_PAIR(tc->colorpair), NULL);
6490 		if (width < view->ncols - 1)
6491 			waddch(view->window, '\n');
6492 		if (n == s->selected && view->focussed)
6493 			wstandend(view->window);
6494 		free(line);
6495 		free(wline);
6496 		wline = NULL;
6497 		n++;
6498 		s->ndisplayed++;
6499 		s->last_displayed_entry = te;
6500 		if (--limit <= 0)
6501 			break;
6502 	}
6503 
6504 	return err;
6505 }
6506 
6507 static void
6508 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6509 {
6510 	struct got_tree_entry *te;
6511 	int isroot = s->tree == s->root;
6512 	int i = 0;
6513 
6514 	if (s->first_displayed_entry == NULL)
6515 		return;
6516 
6517 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6518 	while (i++ < maxscroll) {
6519 		if (te == NULL) {
6520 			if (!isroot)
6521 				s->first_displayed_entry = NULL;
6522 			break;
6523 		}
6524 		s->first_displayed_entry = te;
6525 		te = got_tree_entry_get_prev(s->tree, te);
6526 	}
6527 }
6528 
6529 static const struct got_error *
6530 tree_scroll_down(struct tog_view *view, int maxscroll)
6531 {
6532 	struct tog_tree_view_state *s = &view->state.tree;
6533 	struct got_tree_entry *next, *last;
6534 	int n = 0;
6535 
6536 	if (s->first_displayed_entry)
6537 		next = got_tree_entry_get_next(s->tree,
6538 		    s->first_displayed_entry);
6539 	else
6540 		next = got_object_tree_get_first_entry(s->tree);
6541 
6542 	last = s->last_displayed_entry;
6543 	while (next && n++ < maxscroll) {
6544 		if (last) {
6545 			s->last_displayed_entry = last;
6546 			last = got_tree_entry_get_next(s->tree, last);
6547 		}
6548 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6549 			s->first_displayed_entry = next;
6550 			next = got_tree_entry_get_next(s->tree, next);
6551 		}
6552 	}
6553 
6554 	return NULL;
6555 }
6556 
6557 static const struct got_error *
6558 tree_entry_path(char **path, struct tog_parent_trees *parents,
6559     struct got_tree_entry *te)
6560 {
6561 	const struct got_error *err = NULL;
6562 	struct tog_parent_tree *pt;
6563 	size_t len = 2; /* for leading slash and NUL */
6564 
6565 	TAILQ_FOREACH(pt, parents, entry)
6566 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6567 		    + 1 /* slash */;
6568 	if (te)
6569 		len += strlen(got_tree_entry_get_name(te));
6570 
6571 	*path = calloc(1, len);
6572 	if (path == NULL)
6573 		return got_error_from_errno("calloc");
6574 
6575 	(*path)[0] = '/';
6576 	pt = TAILQ_LAST(parents, tog_parent_trees);
6577 	while (pt) {
6578 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6579 		if (strlcat(*path, name, len) >= len) {
6580 			err = got_error(GOT_ERR_NO_SPACE);
6581 			goto done;
6582 		}
6583 		if (strlcat(*path, "/", len) >= len) {
6584 			err = got_error(GOT_ERR_NO_SPACE);
6585 			goto done;
6586 		}
6587 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6588 	}
6589 	if (te) {
6590 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6591 			err = got_error(GOT_ERR_NO_SPACE);
6592 			goto done;
6593 		}
6594 	}
6595 done:
6596 	if (err) {
6597 		free(*path);
6598 		*path = NULL;
6599 	}
6600 	return err;
6601 }
6602 
6603 static const struct got_error *
6604 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6605     struct got_tree_entry *te, struct tog_parent_trees *parents,
6606     struct got_object_id *commit_id, struct got_repository *repo)
6607 {
6608 	const struct got_error *err = NULL;
6609 	char *path;
6610 	struct tog_view *blame_view;
6611 
6612 	*new_view = NULL;
6613 
6614 	err = tree_entry_path(&path, parents, te);
6615 	if (err)
6616 		return err;
6617 
6618 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6619 	if (blame_view == NULL) {
6620 		err = got_error_from_errno("view_open");
6621 		goto done;
6622 	}
6623 
6624 	err = open_blame_view(blame_view, path, commit_id, repo);
6625 	if (err) {
6626 		if (err->code == GOT_ERR_CANCELLED)
6627 			err = NULL;
6628 		view_close(blame_view);
6629 	} else
6630 		*new_view = blame_view;
6631 done:
6632 	free(path);
6633 	return err;
6634 }
6635 
6636 static const struct got_error *
6637 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6638     struct tog_tree_view_state *s)
6639 {
6640 	struct tog_view *log_view;
6641 	const struct got_error *err = NULL;
6642 	char *path;
6643 
6644 	*new_view = NULL;
6645 
6646 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6647 	if (log_view == NULL)
6648 		return got_error_from_errno("view_open");
6649 
6650 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6651 	if (err)
6652 		return err;
6653 
6654 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6655 	    path, 0);
6656 	if (err)
6657 		view_close(log_view);
6658 	else
6659 		*new_view = log_view;
6660 	free(path);
6661 	return err;
6662 }
6663 
6664 static const struct got_error *
6665 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6666     const char *head_ref_name, struct got_repository *repo)
6667 {
6668 	const struct got_error *err = NULL;
6669 	char *commit_id_str = NULL;
6670 	struct tog_tree_view_state *s = &view->state.tree;
6671 	struct got_commit_object *commit = NULL;
6672 
6673 	TAILQ_INIT(&s->parents);
6674 	STAILQ_INIT(&s->colors);
6675 
6676 	s->commit_id = got_object_id_dup(commit_id);
6677 	if (s->commit_id == NULL)
6678 		return got_error_from_errno("got_object_id_dup");
6679 
6680 	err = got_object_open_as_commit(&commit, repo, commit_id);
6681 	if (err)
6682 		goto done;
6683 
6684 	/*
6685 	 * The root is opened here and will be closed when the view is closed.
6686 	 * Any visited subtrees and their path-wise parents are opened and
6687 	 * closed on demand.
6688 	 */
6689 	err = got_object_open_as_tree(&s->root, repo,
6690 	    got_object_commit_get_tree_id(commit));
6691 	if (err)
6692 		goto done;
6693 	s->tree = s->root;
6694 
6695 	err = got_object_id_str(&commit_id_str, commit_id);
6696 	if (err != NULL)
6697 		goto done;
6698 
6699 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6700 		err = got_error_from_errno("asprintf");
6701 		goto done;
6702 	}
6703 
6704 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6705 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6706 	if (head_ref_name) {
6707 		s->head_ref_name = strdup(head_ref_name);
6708 		if (s->head_ref_name == NULL) {
6709 			err = got_error_from_errno("strdup");
6710 			goto done;
6711 		}
6712 	}
6713 	s->repo = repo;
6714 
6715 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6716 		err = add_color(&s->colors, "\\$$",
6717 		    TOG_COLOR_TREE_SUBMODULE,
6718 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6719 		if (err)
6720 			goto done;
6721 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6722 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6723 		if (err)
6724 			goto done;
6725 		err = add_color(&s->colors, "/$",
6726 		    TOG_COLOR_TREE_DIRECTORY,
6727 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6728 		if (err)
6729 			goto done;
6730 
6731 		err = add_color(&s->colors, "\\*$",
6732 		    TOG_COLOR_TREE_EXECUTABLE,
6733 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6734 		if (err)
6735 			goto done;
6736 
6737 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6738 		    get_color_value("TOG_COLOR_COMMIT"));
6739 		if (err)
6740 			goto done;
6741 	}
6742 
6743 	view->show = show_tree_view;
6744 	view->input = input_tree_view;
6745 	view->close = close_tree_view;
6746 	view->search_start = search_start_tree_view;
6747 	view->search_next = search_next_tree_view;
6748 done:
6749 	free(commit_id_str);
6750 	if (commit)
6751 		got_object_commit_close(commit);
6752 	if (err)
6753 		close_tree_view(view);
6754 	return err;
6755 }
6756 
6757 static const struct got_error *
6758 close_tree_view(struct tog_view *view)
6759 {
6760 	struct tog_tree_view_state *s = &view->state.tree;
6761 
6762 	free_colors(&s->colors);
6763 	free(s->tree_label);
6764 	s->tree_label = NULL;
6765 	free(s->commit_id);
6766 	s->commit_id = NULL;
6767 	free(s->head_ref_name);
6768 	s->head_ref_name = NULL;
6769 	while (!TAILQ_EMPTY(&s->parents)) {
6770 		struct tog_parent_tree *parent;
6771 		parent = TAILQ_FIRST(&s->parents);
6772 		TAILQ_REMOVE(&s->parents, parent, entry);
6773 		if (parent->tree != s->root)
6774 			got_object_tree_close(parent->tree);
6775 		free(parent);
6776 
6777 	}
6778 	if (s->tree != NULL && s->tree != s->root)
6779 		got_object_tree_close(s->tree);
6780 	if (s->root)
6781 		got_object_tree_close(s->root);
6782 	return NULL;
6783 }
6784 
6785 static const struct got_error *
6786 search_start_tree_view(struct tog_view *view)
6787 {
6788 	struct tog_tree_view_state *s = &view->state.tree;
6789 
6790 	s->matched_entry = NULL;
6791 	return NULL;
6792 }
6793 
6794 static int
6795 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
6796 {
6797 	regmatch_t regmatch;
6798 
6799 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
6800 	    0) == 0;
6801 }
6802 
6803 static const struct got_error *
6804 search_next_tree_view(struct tog_view *view)
6805 {
6806 	struct tog_tree_view_state *s = &view->state.tree;
6807 	struct got_tree_entry *te = NULL;
6808 
6809 	if (!view->searching) {
6810 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
6811 		return NULL;
6812 	}
6813 
6814 	if (s->matched_entry) {
6815 		if (view->searching == TOG_SEARCH_FORWARD) {
6816 			if (s->selected_entry)
6817 				te = got_tree_entry_get_next(s->tree,
6818 				    s->selected_entry);
6819 			else
6820 				te = got_object_tree_get_first_entry(s->tree);
6821 		} else {
6822 			if (s->selected_entry == NULL)
6823 				te = got_object_tree_get_last_entry(s->tree);
6824 			else
6825 				te = got_tree_entry_get_prev(s->tree,
6826 				    s->selected_entry);
6827 		}
6828 	} else {
6829 		if (s->selected_entry)
6830 			te = s->selected_entry;
6831 		else if (view->searching == TOG_SEARCH_FORWARD)
6832 			te = got_object_tree_get_first_entry(s->tree);
6833 		else
6834 			te = got_object_tree_get_last_entry(s->tree);
6835 	}
6836 
6837 	while (1) {
6838 		if (te == NULL) {
6839 			if (s->matched_entry == NULL) {
6840 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6841 				return NULL;
6842 			}
6843 			if (view->searching == TOG_SEARCH_FORWARD)
6844 				te = got_object_tree_get_first_entry(s->tree);
6845 			else
6846 				te = got_object_tree_get_last_entry(s->tree);
6847 		}
6848 
6849 		if (match_tree_entry(te, &view->regex)) {
6850 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
6851 			s->matched_entry = te;
6852 			break;
6853 		}
6854 
6855 		if (view->searching == TOG_SEARCH_FORWARD)
6856 			te = got_tree_entry_get_next(s->tree, te);
6857 		else
6858 			te = got_tree_entry_get_prev(s->tree, te);
6859 	}
6860 
6861 	if (s->matched_entry) {
6862 		s->first_displayed_entry = s->matched_entry;
6863 		s->selected = 0;
6864 	}
6865 
6866 	return NULL;
6867 }
6868 
6869 static const struct got_error *
6870 show_tree_view(struct tog_view *view)
6871 {
6872 	const struct got_error *err = NULL;
6873 	struct tog_tree_view_state *s = &view->state.tree;
6874 	char *parent_path;
6875 
6876 	err = tree_entry_path(&parent_path, &s->parents, NULL);
6877 	if (err)
6878 		return err;
6879 
6880 	err = draw_tree_entries(view, parent_path);
6881 	free(parent_path);
6882 
6883 	view_border(view);
6884 	return err;
6885 }
6886 
6887 static const struct got_error *
6888 tree_goto_line(struct tog_view *view, int nlines)
6889 {
6890 	const struct got_error		 *err = NULL;
6891 	struct tog_tree_view_state	 *s = &view->state.tree;
6892 	struct got_tree_entry		**fte, **lte, **ste;
6893 	int				  g, last, first = 1, i = 1;
6894 	int				  root = s->tree == s->root;
6895 	int				  off = root ? 1 : 2;
6896 
6897 	g = view->gline;
6898 	view->gline = 0;
6899 
6900 	if (g == 0)
6901 		g = 1;
6902 	else if (g > got_object_tree_get_nentries(s->tree))
6903 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
6904 
6905 	fte = &s->first_displayed_entry;
6906 	lte = &s->last_displayed_entry;
6907 	ste = &s->selected_entry;
6908 
6909 	if (*fte != NULL) {
6910 		first = got_tree_entry_get_index(*fte);
6911 		first += off;  /* account for ".." */
6912 	}
6913 	last = got_tree_entry_get_index(*lte);
6914 	last += off;
6915 
6916 	if (g >= first && g <= last && g - first < nlines) {
6917 		s->selected = g - first;
6918 		return NULL;	/* gline is on the current page */
6919 	}
6920 
6921 	if (*ste != NULL) {
6922 		i = got_tree_entry_get_index(*ste);
6923 		i += off;
6924 	}
6925 
6926 	if (i < g) {
6927 		err = tree_scroll_down(view, g - i);
6928 		if (err)
6929 			return err;
6930 		if (got_tree_entry_get_index(*lte) >=
6931 		    got_object_tree_get_nentries(s->tree) - 1 &&
6932 		    first + s->selected < g &&
6933 		    s->selected < s->ndisplayed - 1) {
6934 			first = got_tree_entry_get_index(*fte);
6935 			first += off;
6936 			s->selected = g - first;
6937 		}
6938 	} else if (i > g)
6939 		tree_scroll_up(s, i - g);
6940 
6941 	if (g < nlines &&
6942 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
6943 		s->selected = g - 1;
6944 
6945 	return NULL;
6946 }
6947 
6948 static const struct got_error *
6949 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
6950 {
6951 	const struct got_error *err = NULL;
6952 	struct tog_tree_view_state *s = &view->state.tree;
6953 	struct got_tree_entry *te;
6954 	int n, nscroll = view->nlines - 3;
6955 
6956 	if (view->gline)
6957 		return tree_goto_line(view, nscroll);
6958 
6959 	switch (ch) {
6960 	case 'i':
6961 		s->show_ids = !s->show_ids;
6962 		view->count = 0;
6963 		break;
6964 	case 'L':
6965 		view->count = 0;
6966 		if (!s->selected_entry)
6967 			break;
6968 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
6969 		break;
6970 	case 'R':
6971 		view->count = 0;
6972 		err = view_request_new(new_view, view, TOG_VIEW_REF);
6973 		break;
6974 	case 'g':
6975 	case KEY_HOME:
6976 		s->selected = 0;
6977 		view->count = 0;
6978 		if (s->tree == s->root)
6979 			s->first_displayed_entry =
6980 			    got_object_tree_get_first_entry(s->tree);
6981 		else
6982 			s->first_displayed_entry = NULL;
6983 		break;
6984 	case 'G':
6985 	case KEY_END: {
6986 		int eos = view->nlines - 3;
6987 
6988 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
6989 			--eos;  /* border */
6990 		s->selected = 0;
6991 		view->count = 0;
6992 		te = got_object_tree_get_last_entry(s->tree);
6993 		for (n = 0; n < eos; n++) {
6994 			if (te == NULL) {
6995 				if (s->tree != s->root) {
6996 					s->first_displayed_entry = NULL;
6997 					n++;
6998 				}
6999 				break;
7000 			}
7001 			s->first_displayed_entry = te;
7002 			te = got_tree_entry_get_prev(s->tree, te);
7003 		}
7004 		if (n > 0)
7005 			s->selected = n - 1;
7006 		break;
7007 	}
7008 	case 'k':
7009 	case KEY_UP:
7010 	case CTRL('p'):
7011 		if (s->selected > 0) {
7012 			s->selected--;
7013 			break;
7014 		}
7015 		tree_scroll_up(s, 1);
7016 		if (s->selected_entry == NULL ||
7017 		    (s->tree == s->root && s->selected_entry ==
7018 		     got_object_tree_get_first_entry(s->tree)))
7019 			view->count = 0;
7020 		break;
7021 	case CTRL('u'):
7022 	case 'u':
7023 		nscroll /= 2;
7024 		/* FALL THROUGH */
7025 	case KEY_PPAGE:
7026 	case CTRL('b'):
7027 	case 'b':
7028 		if (s->tree == s->root) {
7029 			if (got_object_tree_get_first_entry(s->tree) ==
7030 			    s->first_displayed_entry)
7031 				s->selected -= MIN(s->selected, nscroll);
7032 		} else {
7033 			if (s->first_displayed_entry == NULL)
7034 				s->selected -= MIN(s->selected, nscroll);
7035 		}
7036 		tree_scroll_up(s, MAX(0, nscroll));
7037 		if (s->selected_entry == NULL ||
7038 		    (s->tree == s->root && s->selected_entry ==
7039 		     got_object_tree_get_first_entry(s->tree)))
7040 			view->count = 0;
7041 		break;
7042 	case 'j':
7043 	case KEY_DOWN:
7044 	case CTRL('n'):
7045 		if (s->selected < s->ndisplayed - 1) {
7046 			s->selected++;
7047 			break;
7048 		}
7049 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7050 		    == NULL) {
7051 			/* can't scroll any further */
7052 			view->count = 0;
7053 			break;
7054 		}
7055 		tree_scroll_down(view, 1);
7056 		break;
7057 	case CTRL('d'):
7058 	case 'd':
7059 		nscroll /= 2;
7060 		/* FALL THROUGH */
7061 	case KEY_NPAGE:
7062 	case CTRL('f'):
7063 	case 'f':
7064 	case ' ':
7065 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7066 		    == NULL) {
7067 			/* can't scroll any further; move cursor down */
7068 			if (s->selected < s->ndisplayed - 1)
7069 				s->selected += MIN(nscroll,
7070 				    s->ndisplayed - s->selected - 1);
7071 			else
7072 				view->count = 0;
7073 			break;
7074 		}
7075 		tree_scroll_down(view, nscroll);
7076 		break;
7077 	case KEY_ENTER:
7078 	case '\r':
7079 	case KEY_BACKSPACE:
7080 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7081 			struct tog_parent_tree *parent;
7082 			/* user selected '..' */
7083 			if (s->tree == s->root) {
7084 				view->count = 0;
7085 				break;
7086 			}
7087 			parent = TAILQ_FIRST(&s->parents);
7088 			TAILQ_REMOVE(&s->parents, parent,
7089 			    entry);
7090 			got_object_tree_close(s->tree);
7091 			s->tree = parent->tree;
7092 			s->first_displayed_entry =
7093 			    parent->first_displayed_entry;
7094 			s->selected_entry =
7095 			    parent->selected_entry;
7096 			s->selected = parent->selected;
7097 			if (s->selected > view->nlines - 3) {
7098 				err = offset_selection_down(view);
7099 				if (err)
7100 					break;
7101 			}
7102 			free(parent);
7103 		} else if (S_ISDIR(got_tree_entry_get_mode(
7104 		    s->selected_entry))) {
7105 			struct got_tree_object *subtree;
7106 			view->count = 0;
7107 			err = got_object_open_as_tree(&subtree, s->repo,
7108 			    got_tree_entry_get_id(s->selected_entry));
7109 			if (err)
7110 				break;
7111 			err = tree_view_visit_subtree(s, subtree);
7112 			if (err) {
7113 				got_object_tree_close(subtree);
7114 				break;
7115 			}
7116 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7117 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7118 		break;
7119 	case KEY_RESIZE:
7120 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7121 			s->selected = view->nlines - 4;
7122 		view->count = 0;
7123 		break;
7124 	default:
7125 		view->count = 0;
7126 		break;
7127 	}
7128 
7129 	return err;
7130 }
7131 
7132 __dead static void
7133 usage_tree(void)
7134 {
7135 	endwin();
7136 	fprintf(stderr,
7137 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7138 	    getprogname());
7139 	exit(1);
7140 }
7141 
7142 static const struct got_error *
7143 cmd_tree(int argc, char *argv[])
7144 {
7145 	const struct got_error *error;
7146 	struct got_repository *repo = NULL;
7147 	struct got_worktree *worktree = NULL;
7148 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7149 	struct got_object_id *commit_id = NULL;
7150 	struct got_commit_object *commit = NULL;
7151 	const char *commit_id_arg = NULL;
7152 	char *label = NULL;
7153 	struct got_reference *ref = NULL;
7154 	const char *head_ref_name = NULL;
7155 	int ch;
7156 	struct tog_view *view;
7157 	int *pack_fds = NULL;
7158 
7159 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7160 		switch (ch) {
7161 		case 'c':
7162 			commit_id_arg = optarg;
7163 			break;
7164 		case 'r':
7165 			repo_path = realpath(optarg, NULL);
7166 			if (repo_path == NULL)
7167 				return got_error_from_errno2("realpath",
7168 				    optarg);
7169 			break;
7170 		default:
7171 			usage_tree();
7172 			/* NOTREACHED */
7173 		}
7174 	}
7175 
7176 	argc -= optind;
7177 	argv += optind;
7178 
7179 	if (argc > 1)
7180 		usage_tree();
7181 
7182 	error = got_repo_pack_fds_open(&pack_fds);
7183 	if (error != NULL)
7184 		goto done;
7185 
7186 	if (repo_path == NULL) {
7187 		cwd = getcwd(NULL, 0);
7188 		if (cwd == NULL)
7189 			return got_error_from_errno("getcwd");
7190 		error = got_worktree_open(&worktree, cwd);
7191 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7192 			goto done;
7193 		if (worktree)
7194 			repo_path =
7195 			    strdup(got_worktree_get_repo_path(worktree));
7196 		else
7197 			repo_path = strdup(cwd);
7198 		if (repo_path == NULL) {
7199 			error = got_error_from_errno("strdup");
7200 			goto done;
7201 		}
7202 	}
7203 
7204 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7205 	if (error != NULL)
7206 		goto done;
7207 
7208 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7209 	    repo, worktree);
7210 	if (error)
7211 		goto done;
7212 
7213 	init_curses();
7214 
7215 	error = apply_unveil(got_repo_get_path(repo), NULL);
7216 	if (error)
7217 		goto done;
7218 
7219 	error = tog_load_refs(repo, 0);
7220 	if (error)
7221 		goto done;
7222 
7223 	if (commit_id_arg == NULL) {
7224 		error = got_repo_match_object_id(&commit_id, &label,
7225 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7226 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7227 		if (error)
7228 			goto done;
7229 		head_ref_name = label;
7230 	} else {
7231 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7232 		if (error == NULL)
7233 			head_ref_name = got_ref_get_name(ref);
7234 		else if (error->code != GOT_ERR_NOT_REF)
7235 			goto done;
7236 		error = got_repo_match_object_id(&commit_id, NULL,
7237 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7238 		if (error)
7239 			goto done;
7240 	}
7241 
7242 	error = got_object_open_as_commit(&commit, repo, commit_id);
7243 	if (error)
7244 		goto done;
7245 
7246 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7247 	if (view == NULL) {
7248 		error = got_error_from_errno("view_open");
7249 		goto done;
7250 	}
7251 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7252 	if (error)
7253 		goto done;
7254 	if (!got_path_is_root_dir(in_repo_path)) {
7255 		error = tree_view_walk_path(&view->state.tree, commit,
7256 		    in_repo_path);
7257 		if (error)
7258 			goto done;
7259 	}
7260 
7261 	if (worktree) {
7262 		/* Release work tree lock. */
7263 		got_worktree_close(worktree);
7264 		worktree = NULL;
7265 	}
7266 	error = view_loop(view);
7267 done:
7268 	free(repo_path);
7269 	free(cwd);
7270 	free(commit_id);
7271 	free(label);
7272 	if (ref)
7273 		got_ref_close(ref);
7274 	if (repo) {
7275 		const struct got_error *close_err = got_repo_close(repo);
7276 		if (error == NULL)
7277 			error = close_err;
7278 	}
7279 	if (pack_fds) {
7280 		const struct got_error *pack_err =
7281 		    got_repo_pack_fds_close(pack_fds);
7282 		if (error == NULL)
7283 			error = pack_err;
7284 	}
7285 	tog_free_refs();
7286 	return error;
7287 }
7288 
7289 static const struct got_error *
7290 ref_view_load_refs(struct tog_ref_view_state *s)
7291 {
7292 	struct got_reflist_entry *sre;
7293 	struct tog_reflist_entry *re;
7294 
7295 	s->nrefs = 0;
7296 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7297 		if (strncmp(got_ref_get_name(sre->ref),
7298 		    "refs/got/", 9) == 0 &&
7299 		    strncmp(got_ref_get_name(sre->ref),
7300 		    "refs/got/backup/", 16) != 0)
7301 			continue;
7302 
7303 		re = malloc(sizeof(*re));
7304 		if (re == NULL)
7305 			return got_error_from_errno("malloc");
7306 
7307 		re->ref = got_ref_dup(sre->ref);
7308 		if (re->ref == NULL)
7309 			return got_error_from_errno("got_ref_dup");
7310 		re->idx = s->nrefs++;
7311 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7312 	}
7313 
7314 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7315 	return NULL;
7316 }
7317 
7318 static void
7319 ref_view_free_refs(struct tog_ref_view_state *s)
7320 {
7321 	struct tog_reflist_entry *re;
7322 
7323 	while (!TAILQ_EMPTY(&s->refs)) {
7324 		re = TAILQ_FIRST(&s->refs);
7325 		TAILQ_REMOVE(&s->refs, re, entry);
7326 		got_ref_close(re->ref);
7327 		free(re);
7328 	}
7329 }
7330 
7331 static const struct got_error *
7332 open_ref_view(struct tog_view *view, struct got_repository *repo)
7333 {
7334 	const struct got_error *err = NULL;
7335 	struct tog_ref_view_state *s = &view->state.ref;
7336 
7337 	s->selected_entry = 0;
7338 	s->repo = repo;
7339 
7340 	TAILQ_INIT(&s->refs);
7341 	STAILQ_INIT(&s->colors);
7342 
7343 	err = ref_view_load_refs(s);
7344 	if (err)
7345 		return err;
7346 
7347 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7348 		err = add_color(&s->colors, "^refs/heads/",
7349 		    TOG_COLOR_REFS_HEADS,
7350 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7351 		if (err)
7352 			goto done;
7353 
7354 		err = add_color(&s->colors, "^refs/tags/",
7355 		    TOG_COLOR_REFS_TAGS,
7356 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7357 		if (err)
7358 			goto done;
7359 
7360 		err = add_color(&s->colors, "^refs/remotes/",
7361 		    TOG_COLOR_REFS_REMOTES,
7362 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7363 		if (err)
7364 			goto done;
7365 
7366 		err = add_color(&s->colors, "^refs/got/backup/",
7367 		    TOG_COLOR_REFS_BACKUP,
7368 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7369 		if (err)
7370 			goto done;
7371 	}
7372 
7373 	view->show = show_ref_view;
7374 	view->input = input_ref_view;
7375 	view->close = close_ref_view;
7376 	view->search_start = search_start_ref_view;
7377 	view->search_next = search_next_ref_view;
7378 done:
7379 	if (err)
7380 		free_colors(&s->colors);
7381 	return err;
7382 }
7383 
7384 static const struct got_error *
7385 close_ref_view(struct tog_view *view)
7386 {
7387 	struct tog_ref_view_state *s = &view->state.ref;
7388 
7389 	ref_view_free_refs(s);
7390 	free_colors(&s->colors);
7391 
7392 	return NULL;
7393 }
7394 
7395 static const struct got_error *
7396 resolve_reflist_entry(struct got_object_id **commit_id,
7397     struct tog_reflist_entry *re, struct got_repository *repo)
7398 {
7399 	const struct got_error *err = NULL;
7400 	struct got_object_id *obj_id;
7401 	struct got_tag_object *tag = NULL;
7402 	int obj_type;
7403 
7404 	*commit_id = NULL;
7405 
7406 	err = got_ref_resolve(&obj_id, repo, re->ref);
7407 	if (err)
7408 		return err;
7409 
7410 	err = got_object_get_type(&obj_type, repo, obj_id);
7411 	if (err)
7412 		goto done;
7413 
7414 	switch (obj_type) {
7415 	case GOT_OBJ_TYPE_COMMIT:
7416 		*commit_id = obj_id;
7417 		break;
7418 	case GOT_OBJ_TYPE_TAG:
7419 		err = got_object_open_as_tag(&tag, repo, obj_id);
7420 		if (err)
7421 			goto done;
7422 		free(obj_id);
7423 		err = got_object_get_type(&obj_type, repo,
7424 		    got_object_tag_get_object_id(tag));
7425 		if (err)
7426 			goto done;
7427 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7428 			err = got_error(GOT_ERR_OBJ_TYPE);
7429 			goto done;
7430 		}
7431 		*commit_id = got_object_id_dup(
7432 		    got_object_tag_get_object_id(tag));
7433 		if (*commit_id == NULL) {
7434 			err = got_error_from_errno("got_object_id_dup");
7435 			goto done;
7436 		}
7437 		break;
7438 	default:
7439 		err = got_error(GOT_ERR_OBJ_TYPE);
7440 		break;
7441 	}
7442 
7443 done:
7444 	if (tag)
7445 		got_object_tag_close(tag);
7446 	if (err) {
7447 		free(*commit_id);
7448 		*commit_id = NULL;
7449 	}
7450 	return err;
7451 }
7452 
7453 static const struct got_error *
7454 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7455     struct tog_reflist_entry *re, struct got_repository *repo)
7456 {
7457 	struct tog_view *log_view;
7458 	const struct got_error *err = NULL;
7459 	struct got_object_id *commit_id = NULL;
7460 
7461 	*new_view = NULL;
7462 
7463 	err = resolve_reflist_entry(&commit_id, re, repo);
7464 	if (err) {
7465 		if (err->code != GOT_ERR_OBJ_TYPE)
7466 			return err;
7467 		else
7468 			return NULL;
7469 	}
7470 
7471 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7472 	if (log_view == NULL) {
7473 		err = got_error_from_errno("view_open");
7474 		goto done;
7475 	}
7476 
7477 	err = open_log_view(log_view, commit_id, repo,
7478 	    got_ref_get_name(re->ref), "", 0);
7479 done:
7480 	if (err)
7481 		view_close(log_view);
7482 	else
7483 		*new_view = log_view;
7484 	free(commit_id);
7485 	return err;
7486 }
7487 
7488 static void
7489 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7490 {
7491 	struct tog_reflist_entry *re;
7492 	int i = 0;
7493 
7494 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7495 		return;
7496 
7497 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7498 	while (i++ < maxscroll) {
7499 		if (re == NULL)
7500 			break;
7501 		s->first_displayed_entry = re;
7502 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7503 	}
7504 }
7505 
7506 static const struct got_error *
7507 ref_scroll_down(struct tog_view *view, int maxscroll)
7508 {
7509 	struct tog_ref_view_state *s = &view->state.ref;
7510 	struct tog_reflist_entry *next, *last;
7511 	int n = 0;
7512 
7513 	if (s->first_displayed_entry)
7514 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7515 	else
7516 		next = TAILQ_FIRST(&s->refs);
7517 
7518 	last = s->last_displayed_entry;
7519 	while (next && n++ < maxscroll) {
7520 		if (last) {
7521 			s->last_displayed_entry = last;
7522 			last = TAILQ_NEXT(last, entry);
7523 		}
7524 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7525 			s->first_displayed_entry = next;
7526 			next = TAILQ_NEXT(next, entry);
7527 		}
7528 	}
7529 
7530 	return NULL;
7531 }
7532 
7533 static const struct got_error *
7534 search_start_ref_view(struct tog_view *view)
7535 {
7536 	struct tog_ref_view_state *s = &view->state.ref;
7537 
7538 	s->matched_entry = NULL;
7539 	return NULL;
7540 }
7541 
7542 static int
7543 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7544 {
7545 	regmatch_t regmatch;
7546 
7547 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7548 	    0) == 0;
7549 }
7550 
7551 static const struct got_error *
7552 search_next_ref_view(struct tog_view *view)
7553 {
7554 	struct tog_ref_view_state *s = &view->state.ref;
7555 	struct tog_reflist_entry *re = NULL;
7556 
7557 	if (!view->searching) {
7558 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7559 		return NULL;
7560 	}
7561 
7562 	if (s->matched_entry) {
7563 		if (view->searching == TOG_SEARCH_FORWARD) {
7564 			if (s->selected_entry)
7565 				re = TAILQ_NEXT(s->selected_entry, entry);
7566 			else
7567 				re = TAILQ_PREV(s->selected_entry,
7568 				    tog_reflist_head, entry);
7569 		} else {
7570 			if (s->selected_entry == NULL)
7571 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7572 			else
7573 				re = TAILQ_PREV(s->selected_entry,
7574 				    tog_reflist_head, entry);
7575 		}
7576 	} else {
7577 		if (s->selected_entry)
7578 			re = s->selected_entry;
7579 		else if (view->searching == TOG_SEARCH_FORWARD)
7580 			re = TAILQ_FIRST(&s->refs);
7581 		else
7582 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7583 	}
7584 
7585 	while (1) {
7586 		if (re == NULL) {
7587 			if (s->matched_entry == NULL) {
7588 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7589 				return NULL;
7590 			}
7591 			if (view->searching == TOG_SEARCH_FORWARD)
7592 				re = TAILQ_FIRST(&s->refs);
7593 			else
7594 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7595 		}
7596 
7597 		if (match_reflist_entry(re, &view->regex)) {
7598 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7599 			s->matched_entry = re;
7600 			break;
7601 		}
7602 
7603 		if (view->searching == TOG_SEARCH_FORWARD)
7604 			re = TAILQ_NEXT(re, entry);
7605 		else
7606 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7607 	}
7608 
7609 	if (s->matched_entry) {
7610 		s->first_displayed_entry = s->matched_entry;
7611 		s->selected = 0;
7612 	}
7613 
7614 	return NULL;
7615 }
7616 
7617 static const struct got_error *
7618 show_ref_view(struct tog_view *view)
7619 {
7620 	const struct got_error *err = NULL;
7621 	struct tog_ref_view_state *s = &view->state.ref;
7622 	struct tog_reflist_entry *re;
7623 	char *line = NULL;
7624 	wchar_t *wline;
7625 	struct tog_color *tc;
7626 	int width, n;
7627 	int limit = view->nlines;
7628 
7629 	werase(view->window);
7630 
7631 	s->ndisplayed = 0;
7632 	if (view_is_hsplit_top(view))
7633 		--limit;  /* border */
7634 
7635 	if (limit == 0)
7636 		return NULL;
7637 
7638 	re = s->first_displayed_entry;
7639 
7640 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7641 	    s->nrefs) == -1)
7642 		return got_error_from_errno("asprintf");
7643 
7644 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7645 	if (err) {
7646 		free(line);
7647 		return err;
7648 	}
7649 	if (view_needs_focus_indication(view))
7650 		wstandout(view->window);
7651 	waddwstr(view->window, wline);
7652 	while (width++ < view->ncols)
7653 		waddch(view->window, ' ');
7654 	if (view_needs_focus_indication(view))
7655 		wstandend(view->window);
7656 	free(wline);
7657 	wline = NULL;
7658 	free(line);
7659 	line = NULL;
7660 	if (--limit <= 0)
7661 		return NULL;
7662 
7663 	n = 0;
7664 	while (re && limit > 0) {
7665 		char *line = NULL;
7666 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7667 
7668 		if (s->show_date) {
7669 			struct got_commit_object *ci;
7670 			struct got_tag_object *tag;
7671 			struct got_object_id *id;
7672 			struct tm tm;
7673 			time_t t;
7674 
7675 			err = got_ref_resolve(&id, s->repo, re->ref);
7676 			if (err)
7677 				return err;
7678 			err = got_object_open_as_tag(&tag, s->repo, id);
7679 			if (err) {
7680 				if (err->code != GOT_ERR_OBJ_TYPE) {
7681 					free(id);
7682 					return err;
7683 				}
7684 				err = got_object_open_as_commit(&ci, s->repo,
7685 				    id);
7686 				if (err) {
7687 					free(id);
7688 					return err;
7689 				}
7690 				t = got_object_commit_get_committer_time(ci);
7691 				got_object_commit_close(ci);
7692 			} else {
7693 				t = got_object_tag_get_tagger_time(tag);
7694 				got_object_tag_close(tag);
7695 			}
7696 			free(id);
7697 			if (gmtime_r(&t, &tm) == NULL)
7698 				return got_error_from_errno("gmtime_r");
7699 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7700 				return got_error(GOT_ERR_NO_SPACE);
7701 		}
7702 		if (got_ref_is_symbolic(re->ref)) {
7703 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7704 			    ymd : "", got_ref_get_name(re->ref),
7705 			    got_ref_get_symref_target(re->ref)) == -1)
7706 				return got_error_from_errno("asprintf");
7707 		} else if (s->show_ids) {
7708 			struct got_object_id *id;
7709 			char *id_str;
7710 			err = got_ref_resolve(&id, s->repo, re->ref);
7711 			if (err)
7712 				return err;
7713 			err = got_object_id_str(&id_str, id);
7714 			if (err) {
7715 				free(id);
7716 				return err;
7717 			}
7718 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7719 			    got_ref_get_name(re->ref), id_str) == -1) {
7720 				err = got_error_from_errno("asprintf");
7721 				free(id);
7722 				free(id_str);
7723 				return err;
7724 			}
7725 			free(id);
7726 			free(id_str);
7727 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7728 		    got_ref_get_name(re->ref)) == -1)
7729 			return got_error_from_errno("asprintf");
7730 
7731 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7732 		    0, 0);
7733 		if (err) {
7734 			free(line);
7735 			return err;
7736 		}
7737 		if (n == s->selected) {
7738 			if (view->focussed)
7739 				wstandout(view->window);
7740 			s->selected_entry = re;
7741 		}
7742 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7743 		if (tc)
7744 			wattr_on(view->window,
7745 			    COLOR_PAIR(tc->colorpair), NULL);
7746 		waddwstr(view->window, wline);
7747 		if (tc)
7748 			wattr_off(view->window,
7749 			    COLOR_PAIR(tc->colorpair), NULL);
7750 		if (width < view->ncols - 1)
7751 			waddch(view->window, '\n');
7752 		if (n == s->selected && view->focussed)
7753 			wstandend(view->window);
7754 		free(line);
7755 		free(wline);
7756 		wline = NULL;
7757 		n++;
7758 		s->ndisplayed++;
7759 		s->last_displayed_entry = re;
7760 
7761 		limit--;
7762 		re = TAILQ_NEXT(re, entry);
7763 	}
7764 
7765 	view_border(view);
7766 	return err;
7767 }
7768 
7769 static const struct got_error *
7770 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7771     struct tog_reflist_entry *re, struct got_repository *repo)
7772 {
7773 	const struct got_error *err = NULL;
7774 	struct got_object_id *commit_id = NULL;
7775 	struct tog_view *tree_view;
7776 
7777 	*new_view = NULL;
7778 
7779 	err = resolve_reflist_entry(&commit_id, re, repo);
7780 	if (err) {
7781 		if (err->code != GOT_ERR_OBJ_TYPE)
7782 			return err;
7783 		else
7784 			return NULL;
7785 	}
7786 
7787 
7788 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
7789 	if (tree_view == NULL) {
7790 		err = got_error_from_errno("view_open");
7791 		goto done;
7792 	}
7793 
7794 	err = open_tree_view(tree_view, commit_id,
7795 	    got_ref_get_name(re->ref), repo);
7796 	if (err)
7797 		goto done;
7798 
7799 	*new_view = tree_view;
7800 done:
7801 	free(commit_id);
7802 	return err;
7803 }
7804 
7805 static const struct got_error *
7806 ref_goto_line(struct tog_view *view, int nlines)
7807 {
7808 	const struct got_error		*err = NULL;
7809 	struct tog_ref_view_state	*s = &view->state.ref;
7810 	int				 g, idx = s->selected_entry->idx;
7811 
7812 	g = view->gline;
7813 	view->gline = 0;
7814 
7815 	if (g == 0)
7816 		g = 1;
7817 	else if (g > s->nrefs)
7818 		g = s->nrefs;
7819 
7820 	if (g >= s->first_displayed_entry->idx + 1 &&
7821 	    g <= s->last_displayed_entry->idx + 1 &&
7822 	    g - s->first_displayed_entry->idx - 1 < nlines) {
7823 		s->selected = g - s->first_displayed_entry->idx - 1;
7824 		return NULL;
7825 	}
7826 
7827 	if (idx + 1 < g) {
7828 		err = ref_scroll_down(view, g - idx - 1);
7829 		if (err)
7830 			return err;
7831 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
7832 		    s->first_displayed_entry->idx + s->selected < g &&
7833 		    s->selected < s->ndisplayed - 1)
7834 			s->selected = g - s->first_displayed_entry->idx - 1;
7835 	} else if (idx + 1 > g)
7836 		ref_scroll_up(s, idx - g + 1);
7837 
7838 	if (g < nlines && s->first_displayed_entry->idx == 0)
7839 		s->selected = g - 1;
7840 
7841 	return NULL;
7842 
7843 }
7844 
7845 static const struct got_error *
7846 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
7847 {
7848 	const struct got_error *err = NULL;
7849 	struct tog_ref_view_state *s = &view->state.ref;
7850 	struct tog_reflist_entry *re;
7851 	int n, nscroll = view->nlines - 1;
7852 
7853 	if (view->gline)
7854 		return ref_goto_line(view, nscroll);
7855 
7856 	switch (ch) {
7857 	case 'i':
7858 		s->show_ids = !s->show_ids;
7859 		view->count = 0;
7860 		break;
7861 	case 'm':
7862 		s->show_date = !s->show_date;
7863 		view->count = 0;
7864 		break;
7865 	case 'o':
7866 		s->sort_by_date = !s->sort_by_date;
7867 		view->count = 0;
7868 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
7869 		    got_ref_cmp_by_commit_timestamp_descending :
7870 		    tog_ref_cmp_by_name, s->repo);
7871 		if (err)
7872 			break;
7873 		got_reflist_object_id_map_free(tog_refs_idmap);
7874 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
7875 		    &tog_refs, s->repo);
7876 		if (err)
7877 			break;
7878 		ref_view_free_refs(s);
7879 		err = ref_view_load_refs(s);
7880 		break;
7881 	case KEY_ENTER:
7882 	case '\r':
7883 		view->count = 0;
7884 		if (!s->selected_entry)
7885 			break;
7886 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7887 		break;
7888 	case 'T':
7889 		view->count = 0;
7890 		if (!s->selected_entry)
7891 			break;
7892 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
7893 		break;
7894 	case 'g':
7895 	case KEY_HOME:
7896 		s->selected = 0;
7897 		view->count = 0;
7898 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7899 		break;
7900 	case 'G':
7901 	case KEY_END: {
7902 		int eos = view->nlines - 1;
7903 
7904 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7905 			--eos;  /* border */
7906 		s->selected = 0;
7907 		view->count = 0;
7908 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
7909 		for (n = 0; n < eos; n++) {
7910 			if (re == NULL)
7911 				break;
7912 			s->first_displayed_entry = re;
7913 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7914 		}
7915 		if (n > 0)
7916 			s->selected = n - 1;
7917 		break;
7918 	}
7919 	case 'k':
7920 	case KEY_UP:
7921 	case CTRL('p'):
7922 		if (s->selected > 0) {
7923 			s->selected--;
7924 			break;
7925 		}
7926 		ref_scroll_up(s, 1);
7927 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7928 			view->count = 0;
7929 		break;
7930 	case CTRL('u'):
7931 	case 'u':
7932 		nscroll /= 2;
7933 		/* FALL THROUGH */
7934 	case KEY_PPAGE:
7935 	case CTRL('b'):
7936 	case 'b':
7937 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7938 			s->selected -= MIN(nscroll, s->selected);
7939 		ref_scroll_up(s, MAX(0, nscroll));
7940 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
7941 			view->count = 0;
7942 		break;
7943 	case 'j':
7944 	case KEY_DOWN:
7945 	case CTRL('n'):
7946 		if (s->selected < s->ndisplayed - 1) {
7947 			s->selected++;
7948 			break;
7949 		}
7950 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7951 			/* can't scroll any further */
7952 			view->count = 0;
7953 			break;
7954 		}
7955 		ref_scroll_down(view, 1);
7956 		break;
7957 	case CTRL('d'):
7958 	case 'd':
7959 		nscroll /= 2;
7960 		/* FALL THROUGH */
7961 	case KEY_NPAGE:
7962 	case CTRL('f'):
7963 	case 'f':
7964 	case ' ':
7965 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
7966 			/* can't scroll any further; move cursor down */
7967 			if (s->selected < s->ndisplayed - 1)
7968 				s->selected += MIN(nscroll,
7969 				    s->ndisplayed - s->selected - 1);
7970 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
7971 				s->selected += s->ndisplayed - s->selected - 1;
7972 			view->count = 0;
7973 			break;
7974 		}
7975 		ref_scroll_down(view, nscroll);
7976 		break;
7977 	case CTRL('l'):
7978 		view->count = 0;
7979 		tog_free_refs();
7980 		err = tog_load_refs(s->repo, s->sort_by_date);
7981 		if (err)
7982 			break;
7983 		ref_view_free_refs(s);
7984 		err = ref_view_load_refs(s);
7985 		break;
7986 	case KEY_RESIZE:
7987 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
7988 			s->selected = view->nlines - 2;
7989 		break;
7990 	default:
7991 		view->count = 0;
7992 		break;
7993 	}
7994 
7995 	return err;
7996 }
7997 
7998 __dead static void
7999 usage_ref(void)
8000 {
8001 	endwin();
8002 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8003 	    getprogname());
8004 	exit(1);
8005 }
8006 
8007 static const struct got_error *
8008 cmd_ref(int argc, char *argv[])
8009 {
8010 	const struct got_error *error;
8011 	struct got_repository *repo = NULL;
8012 	struct got_worktree *worktree = NULL;
8013 	char *cwd = NULL, *repo_path = NULL;
8014 	int ch;
8015 	struct tog_view *view;
8016 	int *pack_fds = NULL;
8017 
8018 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8019 		switch (ch) {
8020 		case 'r':
8021 			repo_path = realpath(optarg, NULL);
8022 			if (repo_path == NULL)
8023 				return got_error_from_errno2("realpath",
8024 				    optarg);
8025 			break;
8026 		default:
8027 			usage_ref();
8028 			/* NOTREACHED */
8029 		}
8030 	}
8031 
8032 	argc -= optind;
8033 	argv += optind;
8034 
8035 	if (argc > 1)
8036 		usage_ref();
8037 
8038 	error = got_repo_pack_fds_open(&pack_fds);
8039 	if (error != NULL)
8040 		goto done;
8041 
8042 	if (repo_path == NULL) {
8043 		cwd = getcwd(NULL, 0);
8044 		if (cwd == NULL)
8045 			return got_error_from_errno("getcwd");
8046 		error = got_worktree_open(&worktree, cwd);
8047 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8048 			goto done;
8049 		if (worktree)
8050 			repo_path =
8051 			    strdup(got_worktree_get_repo_path(worktree));
8052 		else
8053 			repo_path = strdup(cwd);
8054 		if (repo_path == NULL) {
8055 			error = got_error_from_errno("strdup");
8056 			goto done;
8057 		}
8058 	}
8059 
8060 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8061 	if (error != NULL)
8062 		goto done;
8063 
8064 	init_curses();
8065 
8066 	error = apply_unveil(got_repo_get_path(repo), NULL);
8067 	if (error)
8068 		goto done;
8069 
8070 	error = tog_load_refs(repo, 0);
8071 	if (error)
8072 		goto done;
8073 
8074 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8075 	if (view == NULL) {
8076 		error = got_error_from_errno("view_open");
8077 		goto done;
8078 	}
8079 
8080 	error = open_ref_view(view, repo);
8081 	if (error)
8082 		goto done;
8083 
8084 	if (worktree) {
8085 		/* Release work tree lock. */
8086 		got_worktree_close(worktree);
8087 		worktree = NULL;
8088 	}
8089 	error = view_loop(view);
8090 done:
8091 	free(repo_path);
8092 	free(cwd);
8093 	if (repo) {
8094 		const struct got_error *close_err = got_repo_close(repo);
8095 		if (close_err)
8096 			error = close_err;
8097 	}
8098 	if (pack_fds) {
8099 		const struct got_error *pack_err =
8100 		    got_repo_pack_fds_close(pack_fds);
8101 		if (error == NULL)
8102 			error = pack_err;
8103 	}
8104 	tog_free_refs();
8105 	return error;
8106 }
8107 
8108 static const struct got_error *
8109 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8110     enum tog_view_type request, int y, int x)
8111 {
8112 	const struct got_error *err = NULL;
8113 
8114 	*new_view = NULL;
8115 
8116 	switch (request) {
8117 	case TOG_VIEW_DIFF:
8118 		if (view->type == TOG_VIEW_LOG) {
8119 			struct tog_log_view_state *s = &view->state.log;
8120 
8121 			err = open_diff_view_for_commit(new_view, y, x,
8122 			    s->selected_entry->commit, s->selected_entry->id,
8123 			    view, s->repo);
8124 		} else
8125 			return got_error_msg(GOT_ERR_NOT_IMPL,
8126 			    "parent/child view pair not supported");
8127 		break;
8128 	case TOG_VIEW_BLAME:
8129 		if (view->type == TOG_VIEW_TREE) {
8130 			struct tog_tree_view_state *s = &view->state.tree;
8131 
8132 			err = blame_tree_entry(new_view, y, x,
8133 			    s->selected_entry, &s->parents, s->commit_id,
8134 			    s->repo);
8135 		} else
8136 			return got_error_msg(GOT_ERR_NOT_IMPL,
8137 			    "parent/child view pair not supported");
8138 		break;
8139 	case TOG_VIEW_LOG:
8140 		if (view->type == TOG_VIEW_BLAME)
8141 			err = log_annotated_line(new_view, y, x,
8142 			    view->state.blame.repo, view->state.blame.id_to_log);
8143 		else if (view->type == TOG_VIEW_TREE)
8144 			err = log_selected_tree_entry(new_view, y, x,
8145 			    &view->state.tree);
8146 		else if (view->type == TOG_VIEW_REF)
8147 			err = log_ref_entry(new_view, y, x,
8148 			    view->state.ref.selected_entry,
8149 			    view->state.ref.repo);
8150 		else
8151 			return got_error_msg(GOT_ERR_NOT_IMPL,
8152 			    "parent/child view pair not supported");
8153 		break;
8154 	case TOG_VIEW_TREE:
8155 		if (view->type == TOG_VIEW_LOG)
8156 			err = browse_commit_tree(new_view, y, x,
8157 			    view->state.log.selected_entry,
8158 			    view->state.log.in_repo_path,
8159 			    view->state.log.head_ref_name,
8160 			    view->state.log.repo);
8161 		else if (view->type == TOG_VIEW_REF)
8162 			err = browse_ref_tree(new_view, y, x,
8163 			    view->state.ref.selected_entry,
8164 			    view->state.ref.repo);
8165 		else
8166 			return got_error_msg(GOT_ERR_NOT_IMPL,
8167 			    "parent/child view pair not supported");
8168 		break;
8169 	case TOG_VIEW_REF:
8170 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8171 		if (*new_view == NULL)
8172 			return got_error_from_errno("view_open");
8173 		if (view->type == TOG_VIEW_LOG)
8174 			err = open_ref_view(*new_view, view->state.log.repo);
8175 		else if (view->type == TOG_VIEW_TREE)
8176 			err = open_ref_view(*new_view, view->state.tree.repo);
8177 		else
8178 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8179 			    "parent/child view pair not supported");
8180 		if (err)
8181 			view_close(*new_view);
8182 		break;
8183 	default:
8184 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8185 	}
8186 
8187 	return err;
8188 }
8189 
8190 /*
8191  * If view was scrolled down to move the selected line into view when opening a
8192  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8193  */
8194 static void
8195 offset_selection_up(struct tog_view *view)
8196 {
8197 	switch (view->type) {
8198 	case TOG_VIEW_BLAME: {
8199 		struct tog_blame_view_state *s = &view->state.blame;
8200 		if (s->first_displayed_line == 1) {
8201 			s->selected_line = MAX(s->selected_line - view->offset,
8202 			    1);
8203 			break;
8204 		}
8205 		if (s->first_displayed_line > view->offset)
8206 			s->first_displayed_line -= view->offset;
8207 		else
8208 			s->first_displayed_line = 1;
8209 		s->selected_line += view->offset;
8210 		break;
8211 	}
8212 	case TOG_VIEW_LOG:
8213 		log_scroll_up(&view->state.log, view->offset);
8214 		view->state.log.selected += view->offset;
8215 		break;
8216 	case TOG_VIEW_REF:
8217 		ref_scroll_up(&view->state.ref, view->offset);
8218 		view->state.ref.selected += view->offset;
8219 		break;
8220 	case TOG_VIEW_TREE:
8221 		tree_scroll_up(&view->state.tree, view->offset);
8222 		view->state.tree.selected += view->offset;
8223 		break;
8224 	default:
8225 		break;
8226 	}
8227 
8228 	view->offset = 0;
8229 }
8230 
8231 /*
8232  * If the selected line is in the section of screen covered by the bottom split,
8233  * scroll down offset lines to move it into view and index its new position.
8234  */
8235 static const struct got_error *
8236 offset_selection_down(struct tog_view *view)
8237 {
8238 	const struct got_error	*err = NULL;
8239 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8240 	int			*selected = NULL;
8241 	int			 header, offset;
8242 
8243 	switch (view->type) {
8244 	case TOG_VIEW_BLAME: {
8245 		struct tog_blame_view_state *s = &view->state.blame;
8246 		header = 3;
8247 		scrolld = NULL;
8248 		if (s->selected_line > view->nlines - header) {
8249 			offset = abs(view->nlines - s->selected_line - header);
8250 			s->first_displayed_line += offset;
8251 			s->selected_line -= offset;
8252 			view->offset = offset;
8253 		}
8254 		break;
8255 	}
8256 	case TOG_VIEW_LOG: {
8257 		struct tog_log_view_state *s = &view->state.log;
8258 		scrolld = &log_scroll_down;
8259 		header = view_is_parent_view(view) ? 3 : 2;
8260 		selected = &s->selected;
8261 		break;
8262 	}
8263 	case TOG_VIEW_REF: {
8264 		struct tog_ref_view_state *s = &view->state.ref;
8265 		scrolld = &ref_scroll_down;
8266 		header = 3;
8267 		selected = &s->selected;
8268 		break;
8269 	}
8270 	case TOG_VIEW_TREE: {
8271 		struct tog_tree_view_state *s = &view->state.tree;
8272 		scrolld = &tree_scroll_down;
8273 		header = 5;
8274 		selected = &s->selected;
8275 		break;
8276 	}
8277 	default:
8278 		selected = NULL;
8279 		scrolld = NULL;
8280 		header = 0;
8281 		break;
8282 	}
8283 
8284 	if (selected && *selected > view->nlines - header) {
8285 		offset = abs(view->nlines - *selected - header);
8286 		view->offset = offset;
8287 		if (scrolld && offset) {
8288 			err = scrolld(view, offset);
8289 			*selected -= offset;
8290 		}
8291 	}
8292 
8293 	return err;
8294 }
8295 
8296 static void
8297 list_commands(FILE *fp)
8298 {
8299 	size_t i;
8300 
8301 	fprintf(fp, "commands:");
8302 	for (i = 0; i < nitems(tog_commands); i++) {
8303 		const struct tog_cmd *cmd = &tog_commands[i];
8304 		fprintf(fp, " %s", cmd->name);
8305 	}
8306 	fputc('\n', fp);
8307 }
8308 
8309 __dead static void
8310 usage(int hflag, int status)
8311 {
8312 	FILE *fp = (status == 0) ? stdout : stderr;
8313 
8314 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8315 	    getprogname());
8316 	if (hflag) {
8317 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8318 		list_commands(fp);
8319 	}
8320 	exit(status);
8321 }
8322 
8323 static char **
8324 make_argv(int argc, ...)
8325 {
8326 	va_list ap;
8327 	char **argv;
8328 	int i;
8329 
8330 	va_start(ap, argc);
8331 
8332 	argv = calloc(argc, sizeof(char *));
8333 	if (argv == NULL)
8334 		err(1, "calloc");
8335 	for (i = 0; i < argc; i++) {
8336 		argv[i] = strdup(va_arg(ap, char *));
8337 		if (argv[i] == NULL)
8338 			err(1, "strdup");
8339 	}
8340 
8341 	va_end(ap);
8342 	return argv;
8343 }
8344 
8345 /*
8346  * Try to convert 'tog path' into a 'tog log path' command.
8347  * The user could simply have mistyped the command rather than knowingly
8348  * provided a path. So check whether argv[0] can in fact be resolved
8349  * to a path in the HEAD commit and print a special error if not.
8350  * This hack is for mpi@ <3
8351  */
8352 static const struct got_error *
8353 tog_log_with_path(int argc, char *argv[])
8354 {
8355 	const struct got_error *error = NULL, *close_err;
8356 	const struct tog_cmd *cmd = NULL;
8357 	struct got_repository *repo = NULL;
8358 	struct got_worktree *worktree = NULL;
8359 	struct got_object_id *commit_id = NULL, *id = NULL;
8360 	struct got_commit_object *commit = NULL;
8361 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8362 	char *commit_id_str = NULL, **cmd_argv = NULL;
8363 	int *pack_fds = NULL;
8364 
8365 	cwd = getcwd(NULL, 0);
8366 	if (cwd == NULL)
8367 		return got_error_from_errno("getcwd");
8368 
8369 	error = got_repo_pack_fds_open(&pack_fds);
8370 	if (error != NULL)
8371 		goto done;
8372 
8373 	error = got_worktree_open(&worktree, cwd);
8374 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8375 		goto done;
8376 
8377 	if (worktree)
8378 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8379 	else
8380 		repo_path = strdup(cwd);
8381 	if (repo_path == NULL) {
8382 		error = got_error_from_errno("strdup");
8383 		goto done;
8384 	}
8385 
8386 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8387 	if (error != NULL)
8388 		goto done;
8389 
8390 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8391 	    repo, worktree);
8392 	if (error)
8393 		goto done;
8394 
8395 	error = tog_load_refs(repo, 0);
8396 	if (error)
8397 		goto done;
8398 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8399 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8400 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8401 	if (error)
8402 		goto done;
8403 
8404 	if (worktree) {
8405 		got_worktree_close(worktree);
8406 		worktree = NULL;
8407 	}
8408 
8409 	error = got_object_open_as_commit(&commit, repo, commit_id);
8410 	if (error)
8411 		goto done;
8412 
8413 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8414 	if (error) {
8415 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8416 			goto done;
8417 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8418 		    getprogname(), argv[0]);
8419 		usage(1, 1);
8420 		/* not reached */
8421 	}
8422 
8423 	error = got_object_id_str(&commit_id_str, commit_id);
8424 	if (error)
8425 		goto done;
8426 
8427 	cmd = &tog_commands[0]; /* log */
8428 	argc = 4;
8429 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8430 	error = cmd->cmd_main(argc, cmd_argv);
8431 done:
8432 	if (repo) {
8433 		close_err = got_repo_close(repo);
8434 		if (error == NULL)
8435 			error = close_err;
8436 	}
8437 	if (commit)
8438 		got_object_commit_close(commit);
8439 	if (worktree)
8440 		got_worktree_close(worktree);
8441 	if (pack_fds) {
8442 		const struct got_error *pack_err =
8443 		    got_repo_pack_fds_close(pack_fds);
8444 		if (error == NULL)
8445 			error = pack_err;
8446 	}
8447 	free(id);
8448 	free(commit_id_str);
8449 	free(commit_id);
8450 	free(cwd);
8451 	free(repo_path);
8452 	free(in_repo_path);
8453 	if (cmd_argv) {
8454 		int i;
8455 		for (i = 0; i < argc; i++)
8456 			free(cmd_argv[i]);
8457 		free(cmd_argv);
8458 	}
8459 	tog_free_refs();
8460 	return error;
8461 }
8462 
8463 int
8464 main(int argc, char *argv[])
8465 {
8466 	const struct got_error *error = NULL;
8467 	const struct tog_cmd *cmd = NULL;
8468 	int ch, hflag = 0, Vflag = 0;
8469 	char **cmd_argv = NULL;
8470 	static const struct option longopts[] = {
8471 	    { "version", no_argument, NULL, 'V' },
8472 	    { NULL, 0, NULL, 0}
8473 	};
8474 	char *diff_algo_str = NULL;
8475 
8476 	if (!isatty(STDIN_FILENO))
8477 		errx(1, "standard input is not a tty");
8478 
8479 	setlocale(LC_CTYPE, "");
8480 
8481 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8482 		switch (ch) {
8483 		case 'h':
8484 			hflag = 1;
8485 			break;
8486 		case 'V':
8487 			Vflag = 1;
8488 			break;
8489 		default:
8490 			usage(hflag, 1);
8491 			/* NOTREACHED */
8492 		}
8493 	}
8494 
8495 	argc -= optind;
8496 	argv += optind;
8497 	optind = 1;
8498 	optreset = 1;
8499 
8500 	if (Vflag) {
8501 		got_version_print_str();
8502 		return 0;
8503 	}
8504 
8505 #ifndef PROFILE
8506 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8507 	    NULL) == -1)
8508 		err(1, "pledge");
8509 #endif
8510 
8511 	if (argc == 0) {
8512 		if (hflag)
8513 			usage(hflag, 0);
8514 		/* Build an argument vector which runs a default command. */
8515 		cmd = &tog_commands[0];
8516 		argc = 1;
8517 		cmd_argv = make_argv(argc, cmd->name);
8518 	} else {
8519 		size_t i;
8520 
8521 		/* Did the user specify a command? */
8522 		for (i = 0; i < nitems(tog_commands); i++) {
8523 			if (strncmp(tog_commands[i].name, argv[0],
8524 			    strlen(argv[0])) == 0) {
8525 				cmd = &tog_commands[i];
8526 				break;
8527 			}
8528 		}
8529 	}
8530 
8531 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8532 	if (diff_algo_str) {
8533 		if (strcasecmp(diff_algo_str, "patience") == 0)
8534 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8535 		if (strcasecmp(diff_algo_str, "myers") == 0)
8536 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8537 	}
8538 
8539 	if (cmd == NULL) {
8540 		if (argc != 1)
8541 			usage(0, 1);
8542 		/* No command specified; try log with a path */
8543 		error = tog_log_with_path(argc, argv);
8544 	} else {
8545 		if (hflag)
8546 			cmd->cmd_usage();
8547 		else
8548 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8549 	}
8550 
8551 	endwin();
8552 	putchar('\n');
8553 	if (cmd_argv) {
8554 		int i;
8555 		for (i = 0; i < argc; i++)
8556 			free(cmd_argv[i]);
8557 		free(cmd_argv);
8558 	}
8559 
8560 	if (error && error->code != GOT_ERR_CANCELLED)
8561 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8562 	return 0;
8563 }