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 #if defined(__FreeBSD__) || defined(__APPLE__)
24 #define _XOPEN_SOURCE_EXTENDED /* for ncurses wide-character functions */
25 #endif
26 #include <curses.h>
27 #include <panel.h>
28 #include <locale.h>
29 #include <signal.h>
30 #include <stdlib.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <getopt.h>
34 #include <string.h>
35 #include <err.h>
36 #include <unistd.h>
37 #include <limits.h>
38 #include <wchar.h>
39 #include <time.h>
40 #include <pthread.h>
41 #include <libgen.h>
42 #include <regex.h>
43 #include <sched.h>
44 
45 #include "got_compat.h"
46 
47 #include "got_version.h"
48 #include "got_error.h"
49 #include "got_object.h"
50 #include "got_reference.h"
51 #include "got_repository.h"
52 #include "got_diff.h"
53 #include "got_opentemp.h"
54 #include "got_utf8.h"
55 #include "got_cancel.h"
56 #include "got_commit_graph.h"
57 #include "got_blame.h"
58 #include "got_privsep.h"
59 #include "got_path.h"
60 #include "got_worktree.h"
61 
62 #ifndef MIN
63 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
64 #endif
65 
66 #ifndef MAX
67 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
68 #endif
69 
70 #ifndef CTRL
71 #define CTRL(x)		((x) & 0x1f)
72 #endif
73 
74 #ifndef nitems
75 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
76 #endif
77 
78 struct tog_cmd {
79 	const char *name;
80 	const struct got_error *(*cmd_main)(int, char *[]);
81 	void (*cmd_usage)(void);
82 };
83 
84 __dead static void	usage(int, int);
85 __dead static void	usage_log(void);
86 __dead static void	usage_diff(void);
87 __dead static void	usage_blame(void);
88 __dead static void	usage_tree(void);
89 __dead static void	usage_ref(void);
90 
91 static const struct got_error*	cmd_log(int, char *[]);
92 static const struct got_error*	cmd_diff(int, char *[]);
93 static const struct got_error*	cmd_blame(int, char *[]);
94 static const struct got_error*	cmd_tree(int, char *[]);
95 static const struct got_error*	cmd_ref(int, char *[]);
96 
97 static const struct tog_cmd tog_commands[] = {
98 	{ "log",	cmd_log,	usage_log },
99 	{ "diff",	cmd_diff,	usage_diff },
100 	{ "blame",	cmd_blame,	usage_blame },
101 	{ "tree",	cmd_tree,	usage_tree },
102 	{ "ref",	cmd_ref,	usage_ref },
103 };
104 
105 enum tog_view_type {
106 	TOG_VIEW_DIFF,
107 	TOG_VIEW_LOG,
108 	TOG_VIEW_BLAME,
109 	TOG_VIEW_TREE,
110 	TOG_VIEW_REF,
111 };
112 
113 enum tog_view_mode {
114 	TOG_VIEW_SPLIT_NONE,
115 	TOG_VIEW_SPLIT_VERT,
116 	TOG_VIEW_SPLIT_HRZN
117 };
118 
119 #define HSPLIT_SCALE	0.3  /* default horizontal split scale */
120 
121 #define TOG_EOF_STRING	"(END)"
122 
123 struct commit_queue_entry {
124 	TAILQ_ENTRY(commit_queue_entry) entry;
125 	struct got_object_id *id;
126 	struct got_commit_object *commit;
127 	int idx;
128 };
129 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
130 struct commit_queue {
131 	int ncommits;
132 	struct commit_queue_head head;
133 };
134 
135 struct tog_color {
136 	STAILQ_ENTRY(tog_color) entry;
137 	regex_t regex;
138 	short colorpair;
139 };
140 STAILQ_HEAD(tog_colors, tog_color);
141 
142 static struct got_reflist_head tog_refs = TAILQ_HEAD_INITIALIZER(tog_refs);
143 static struct got_reflist_object_id_map *tog_refs_idmap;
144 static enum got_diff_algorithm tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
145 
146 static const struct got_error *
147 tog_ref_cmp_by_name(void *arg, int *cmp, struct got_reference *re1,
148     struct got_reference* re2)
149 {
150 	const char *name1 = got_ref_get_name(re1);
151 	const char *name2 = got_ref_get_name(re2);
152 	int isbackup1, isbackup2;
153 
154 	/* Sort backup refs towards the bottom of the list. */
155 	isbackup1 = strncmp(name1, "refs/got/backup/", 16) == 0;
156 	isbackup2 = strncmp(name2, "refs/got/backup/", 16) == 0;
157 	if (!isbackup1 && isbackup2) {
158 		*cmp = -1;
159 		return NULL;
160 	} else if (isbackup1 && !isbackup2) {
161 		*cmp = 1;
162 		return NULL;
163 	}
164 
165 	*cmp = got_path_cmp(name1, name2, strlen(name1), strlen(name2));
166 	return NULL;
167 }
168 
169 static const struct got_error *
170 tog_load_refs(struct got_repository *repo, int sort_by_date)
171 {
172 	const struct got_error *err;
173 
174 	err = got_ref_list(&tog_refs, repo, NULL, sort_by_date ?
175 	    got_ref_cmp_by_commit_timestamp_descending : tog_ref_cmp_by_name,
176 	    repo);
177 	if (err)
178 		return err;
179 
180 	return got_reflist_object_id_map_create(&tog_refs_idmap, &tog_refs,
181 	    repo);
182 }
183 
184 static void
185 tog_free_refs(void)
186 {
187 	if (tog_refs_idmap) {
188 		got_reflist_object_id_map_free(tog_refs_idmap);
189 		tog_refs_idmap = NULL;
190 	}
191 	got_ref_list_free(&tog_refs);
192 }
193 
194 static const struct got_error *
195 add_color(struct tog_colors *colors, const char *pattern,
196     int idx, short color)
197 {
198 	const struct got_error *err = NULL;
199 	struct tog_color *tc;
200 	int regerr = 0;
201 
202 	if (idx < 1 || idx > COLOR_PAIRS - 1)
203 		return NULL;
204 
205 	init_pair(idx, color, -1);
206 
207 	tc = calloc(1, sizeof(*tc));
208 	if (tc == NULL)
209 		return got_error_from_errno("calloc");
210 	regerr = regcomp(&tc->regex, pattern,
211 	    REG_EXTENDED | REG_NOSUB | REG_NEWLINE);
212 	if (regerr) {
213 		static char regerr_msg[512];
214 		static char err_msg[512];
215 		regerror(regerr, &tc->regex, regerr_msg,
216 		    sizeof(regerr_msg));
217 		snprintf(err_msg, sizeof(err_msg), "regcomp: %s",
218 		    regerr_msg);
219 		err = got_error_msg(GOT_ERR_REGEX, err_msg);
220 		free(tc);
221 		return err;
222 	}
223 	tc->colorpair = idx;
224 	STAILQ_INSERT_HEAD(colors, tc, entry);
225 	return NULL;
226 }
227 
228 static void
229 free_colors(struct tog_colors *colors)
230 {
231 	struct tog_color *tc;
232 
233 	while (!STAILQ_EMPTY(colors)) {
234 		tc = STAILQ_FIRST(colors);
235 		STAILQ_REMOVE_HEAD(colors, entry);
236 		regfree(&tc->regex);
237 		free(tc);
238 	}
239 }
240 
241 static struct tog_color *
242 get_color(struct tog_colors *colors, int colorpair)
243 {
244 	struct tog_color *tc = NULL;
245 
246 	STAILQ_FOREACH(tc, colors, entry) {
247 		if (tc->colorpair == colorpair)
248 			return tc;
249 	}
250 
251 	return NULL;
252 }
253 
254 static int
255 default_color_value(const char *envvar)
256 {
257 	if (strcmp(envvar, "TOG_COLOR_DIFF_MINUS") == 0)
258 		return COLOR_MAGENTA;
259 	if (strcmp(envvar, "TOG_COLOR_DIFF_PLUS") == 0)
260 		return COLOR_CYAN;
261 	if (strcmp(envvar, "TOG_COLOR_DIFF_CHUNK_HEADER") == 0)
262 		return COLOR_YELLOW;
263 	if (strcmp(envvar, "TOG_COLOR_DIFF_META") == 0)
264 		return COLOR_GREEN;
265 	if (strcmp(envvar, "TOG_COLOR_TREE_SUBMODULE") == 0)
266 		return COLOR_MAGENTA;
267 	if (strcmp(envvar, "TOG_COLOR_TREE_SYMLINK") == 0)
268 		return COLOR_MAGENTA;
269 	if (strcmp(envvar, "TOG_COLOR_TREE_DIRECTORY") == 0)
270 		return COLOR_CYAN;
271 	if (strcmp(envvar, "TOG_COLOR_TREE_EXECUTABLE") == 0)
272 		return COLOR_GREEN;
273 	if (strcmp(envvar, "TOG_COLOR_COMMIT") == 0)
274 		return COLOR_GREEN;
275 	if (strcmp(envvar, "TOG_COLOR_AUTHOR") == 0)
276 		return COLOR_CYAN;
277 	if (strcmp(envvar, "TOG_COLOR_DATE") == 0)
278 		return COLOR_YELLOW;
279 	if (strcmp(envvar, "TOG_COLOR_REFS_HEADS") == 0)
280 		return COLOR_GREEN;
281 	if (strcmp(envvar, "TOG_COLOR_REFS_TAGS") == 0)
282 		return COLOR_MAGENTA;
283 	if (strcmp(envvar, "TOG_COLOR_REFS_REMOTES") == 0)
284 		return COLOR_YELLOW;
285 	if (strcmp(envvar, "TOG_COLOR_REFS_BACKUP") == 0)
286 		return COLOR_CYAN;
287 
288 	return -1;
289 }
290 
291 static int
292 get_color_value(const char *envvar)
293 {
294 	const char *val = getenv(envvar);
295 
296 	if (val == NULL)
297 		return default_color_value(envvar);
298 
299 	if (strcasecmp(val, "black") == 0)
300 		return COLOR_BLACK;
301 	if (strcasecmp(val, "red") == 0)
302 		return COLOR_RED;
303 	if (strcasecmp(val, "green") == 0)
304 		return COLOR_GREEN;
305 	if (strcasecmp(val, "yellow") == 0)
306 		return COLOR_YELLOW;
307 	if (strcasecmp(val, "blue") == 0)
308 		return COLOR_BLUE;
309 	if (strcasecmp(val, "magenta") == 0)
310 		return COLOR_MAGENTA;
311 	if (strcasecmp(val, "cyan") == 0)
312 		return COLOR_CYAN;
313 	if (strcasecmp(val, "white") == 0)
314 		return COLOR_WHITE;
315 	if (strcasecmp(val, "default") == 0)
316 		return -1;
317 
318 	return default_color_value(envvar);
319 }
320 
321 struct tog_diff_view_state {
322 	struct got_object_id *id1, *id2;
323 	const char *label1, *label2;
324 	FILE *f, *f1, *f2;
325 	int fd1, fd2;
326 	int lineno;
327 	int first_displayed_line;
328 	int last_displayed_line;
329 	int eof;
330 	int diff_context;
331 	int ignore_whitespace;
332 	int force_text_diff;
333 	struct got_repository *repo;
334 	struct got_diff_line *lines;
335 	size_t nlines;
336 	int matched_line;
337 	int selected_line;
338 
339 	/* passed from log or blame view; may be NULL */
340 	struct tog_view *parent_view;
341 };
342 
343 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
344 static volatile sig_atomic_t tog_thread_error;
345 
346 struct tog_log_thread_args {
347 	pthread_cond_t need_commits;
348 	pthread_cond_t commit_loaded;
349 	int commits_needed;
350 	int load_all;
351 	struct got_commit_graph *graph;
352 	struct commit_queue *real_commits;
353 	const char *in_repo_path;
354 	struct got_object_id *start_id;
355 	struct got_repository *repo;
356 	int *pack_fds;
357 	int log_complete;
358 	sig_atomic_t *quit;
359 	struct commit_queue_entry **first_displayed_entry;
360 	struct commit_queue_entry **selected_entry;
361 	int *searching;
362 	int *search_next_done;
363 	regex_t *regex;
364 	int *limiting;
365 	int limit_match;
366 	regex_t *limit_regex;
367 	struct commit_queue *limit_commits;
368 };
369 
370 struct tog_log_view_state {
371 	struct commit_queue *commits;
372 	struct commit_queue_entry *first_displayed_entry;
373 	struct commit_queue_entry *last_displayed_entry;
374 	struct commit_queue_entry *selected_entry;
375 	struct commit_queue real_commits;
376 	int selected;
377 	char *in_repo_path;
378 	char *head_ref_name;
379 	int log_branches;
380 	struct got_repository *repo;
381 	struct got_object_id *start_id;
382 	sig_atomic_t quit;
383 	pthread_t thread;
384 	struct tog_log_thread_args thread_args;
385 	struct commit_queue_entry *matched_entry;
386 	struct commit_queue_entry *search_entry;
387 	struct tog_colors colors;
388 	int use_committer;
389 	int limit_view;
390 	regex_t limit_regex;
391 	struct commit_queue limit_commits;
392 };
393 
394 #define TOG_COLOR_DIFF_MINUS		1
395 #define TOG_COLOR_DIFF_PLUS		2
396 #define TOG_COLOR_DIFF_CHUNK_HEADER	3
397 #define TOG_COLOR_DIFF_META		4
398 #define TOG_COLOR_TREE_SUBMODULE	5
399 #define TOG_COLOR_TREE_SYMLINK		6
400 #define TOG_COLOR_TREE_DIRECTORY	7
401 #define TOG_COLOR_TREE_EXECUTABLE	8
402 #define TOG_COLOR_COMMIT		9
403 #define TOG_COLOR_AUTHOR		10
404 #define TOG_COLOR_DATE			11
405 #define TOG_COLOR_REFS_HEADS		12
406 #define TOG_COLOR_REFS_TAGS		13
407 #define TOG_COLOR_REFS_REMOTES		14
408 #define TOG_COLOR_REFS_BACKUP		15
409 
410 struct tog_blame_cb_args {
411 	struct tog_blame_line *lines; /* one per line */
412 	int nlines;
413 
414 	struct tog_view *view;
415 	struct got_object_id *commit_id;
416 	int *quit;
417 };
418 
419 struct tog_blame_thread_args {
420 	const char *path;
421 	struct got_repository *repo;
422 	struct tog_blame_cb_args *cb_args;
423 	int *complete;
424 	got_cancel_cb cancel_cb;
425 	void *cancel_arg;
426 };
427 
428 struct tog_blame {
429 	FILE *f;
430 	off_t filesize;
431 	struct tog_blame_line *lines;
432 	int nlines;
433 	off_t *line_offsets;
434 	pthread_t thread;
435 	struct tog_blame_thread_args thread_args;
436 	struct tog_blame_cb_args cb_args;
437 	const char *path;
438 	int *pack_fds;
439 };
440 
441 struct tog_blame_view_state {
442 	int first_displayed_line;
443 	int last_displayed_line;
444 	int selected_line;
445 	int last_diffed_line;
446 	int blame_complete;
447 	int eof;
448 	int done;
449 	struct got_object_id_queue blamed_commits;
450 	struct got_object_qid *blamed_commit;
451 	char *path;
452 	struct got_repository *repo;
453 	struct got_object_id *commit_id;
454 	struct got_object_id *id_to_log;
455 	struct tog_blame blame;
456 	int matched_line;
457 	struct tog_colors colors;
458 };
459 
460 struct tog_parent_tree {
461 	TAILQ_ENTRY(tog_parent_tree) entry;
462 	struct got_tree_object *tree;
463 	struct got_tree_entry *first_displayed_entry;
464 	struct got_tree_entry *selected_entry;
465 	int selected;
466 };
467 
468 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
469 
470 struct tog_tree_view_state {
471 	char *tree_label;
472 	struct got_object_id *commit_id;/* commit which this tree belongs to */
473 	struct got_tree_object *root;	/* the commit's root tree entry */
474 	struct got_tree_object *tree;	/* currently displayed (sub-)tree */
475 	struct got_tree_entry *first_displayed_entry;
476 	struct got_tree_entry *last_displayed_entry;
477 	struct got_tree_entry *selected_entry;
478 	int ndisplayed, selected, show_ids;
479 	struct tog_parent_trees parents; /* parent trees of current sub-tree */
480 	char *head_ref_name;
481 	struct got_repository *repo;
482 	struct got_tree_entry *matched_entry;
483 	struct tog_colors colors;
484 };
485 
486 struct tog_reflist_entry {
487 	TAILQ_ENTRY(tog_reflist_entry) entry;
488 	struct got_reference *ref;
489 	int idx;
490 };
491 
492 TAILQ_HEAD(tog_reflist_head, tog_reflist_entry);
493 
494 struct tog_ref_view_state {
495 	struct tog_reflist_head refs;
496 	struct tog_reflist_entry *first_displayed_entry;
497 	struct tog_reflist_entry *last_displayed_entry;
498 	struct tog_reflist_entry *selected_entry;
499 	int nrefs, ndisplayed, selected, show_date, show_ids, sort_by_date;
500 	struct got_repository *repo;
501 	struct tog_reflist_entry *matched_entry;
502 	struct tog_colors colors;
503 };
504 
505 /*
506  * We implement two types of views: parent views and child views.
507  *
508  * The 'Tab' key switches focus between a parent view and its child view.
509  * Child views are shown side-by-side to their parent view, provided
510  * there is enough screen estate.
511  *
512  * When a new view is opened from within a parent view, this new view
513  * becomes a child view of the parent view, replacing any existing child.
514  *
515  * When a new view is opened from within a child view, this new view
516  * becomes a parent view which will obscure the views below until the
517  * user quits the new parent view by typing 'q'.
518  *
519  * This list of views contains parent views only.
520  * Child views are only pointed to by their parent view.
521  */
522 TAILQ_HEAD(tog_view_list_head, tog_view);
523 
524 struct tog_view {
525 	TAILQ_ENTRY(tog_view) entry;
526 	WINDOW *window;
527 	PANEL *panel;
528 	int nlines, ncols, begin_y, begin_x; /* based on split height/width */
529 	int resized_y, resized_x; /* begin_y/x based on user resizing */
530 	int maxx, x; /* max column and current start column */
531 	int lines, cols; /* copies of LINES and COLS */
532 	int nscrolled, offset; /* lines scrolled and hsplit line offset */
533 	int gline, hiline; /* navigate to and highlight this nG line */
534 	int ch, count; /* current keymap and count prefix */
535 	int resized; /* set when in a resize event */
536 	int focussed; /* Only set on one parent or child view at a time. */
537 	int dying;
538 	struct tog_view *parent;
539 	struct tog_view *child;
540 
541 	/*
542 	 * This flag is initially set on parent views when a new child view
543 	 * is created. It gets toggled when the 'Tab' key switches focus
544 	 * between parent and child.
545 	 * The flag indicates whether focus should be passed on to our child
546 	 * view if this parent view gets picked for focus after another parent
547 	 * view was closed. This prevents child views from losing focus in such
548 	 * situations.
549 	 */
550 	int focus_child;
551 
552 	enum tog_view_mode mode;
553 	/* type-specific state */
554 	enum tog_view_type type;
555 	union {
556 		struct tog_diff_view_state diff;
557 		struct tog_log_view_state log;
558 		struct tog_blame_view_state blame;
559 		struct tog_tree_view_state tree;
560 		struct tog_ref_view_state ref;
561 	} state;
562 
563 	const struct got_error *(*show)(struct tog_view *);
564 	const struct got_error *(*input)(struct tog_view **,
565 	    struct tog_view *, int);
566 	const struct got_error *(*reset)(struct tog_view *);
567 	const struct got_error *(*resize)(struct tog_view *, int);
568 	const struct got_error *(*close)(struct tog_view *);
569 
570 	const struct got_error *(*search_start)(struct tog_view *);
571 	const struct got_error *(*search_next)(struct tog_view *);
572 	int search_started;
573 	int searching;
574 #define TOG_SEARCH_FORWARD	1
575 #define TOG_SEARCH_BACKWARD	2
576 	int search_next_done;
577 #define TOG_SEARCH_HAVE_MORE	1
578 #define TOG_SEARCH_NO_MORE	2
579 #define TOG_SEARCH_HAVE_NONE	3
580 	regex_t regex;
581 	regmatch_t regmatch;
582 };
583 
584 static const struct got_error *open_diff_view(struct tog_view *,
585     struct got_object_id *, struct got_object_id *,
586     const char *, const char *, int, int, int, struct tog_view *,
587     struct got_repository *);
588 static const struct got_error *show_diff_view(struct tog_view *);
589 static const struct got_error *input_diff_view(struct tog_view **,
590     struct tog_view *, int);
591 static const struct got_error *reset_diff_view(struct tog_view *);
592 static const struct got_error* close_diff_view(struct tog_view *);
593 static const struct got_error *search_start_diff_view(struct tog_view *);
594 static const struct got_error *search_next_diff_view(struct tog_view *);
595 
596 static const struct got_error *open_log_view(struct tog_view *,
597     struct got_object_id *, struct got_repository *,
598     const char *, const char *, int);
599 static const struct got_error * show_log_view(struct tog_view *);
600 static const struct got_error *input_log_view(struct tog_view **,
601     struct tog_view *, int);
602 static const struct got_error *resize_log_view(struct tog_view *, int);
603 static const struct got_error *close_log_view(struct tog_view *);
604 static const struct got_error *search_start_log_view(struct tog_view *);
605 static const struct got_error *search_next_log_view(struct tog_view *);
606 
607 static const struct got_error *open_blame_view(struct tog_view *, char *,
608     struct got_object_id *, struct got_repository *);
609 static const struct got_error *show_blame_view(struct tog_view *);
610 static const struct got_error *input_blame_view(struct tog_view **,
611     struct tog_view *, int);
612 static const struct got_error *reset_blame_view(struct tog_view *);
613 static const struct got_error *close_blame_view(struct tog_view *);
614 static const struct got_error *search_start_blame_view(struct tog_view *);
615 static const struct got_error *search_next_blame_view(struct tog_view *);
616 
617 static const struct got_error *open_tree_view(struct tog_view *,
618     struct got_object_id *, const char *, struct got_repository *);
619 static const struct got_error *show_tree_view(struct tog_view *);
620 static const struct got_error *input_tree_view(struct tog_view **,
621     struct tog_view *, int);
622 static const struct got_error *close_tree_view(struct tog_view *);
623 static const struct got_error *search_start_tree_view(struct tog_view *);
624 static const struct got_error *search_next_tree_view(struct tog_view *);
625 
626 static const struct got_error *open_ref_view(struct tog_view *,
627     struct got_repository *);
628 static const struct got_error *show_ref_view(struct tog_view *);
629 static const struct got_error *input_ref_view(struct tog_view **,
630     struct tog_view *, int);
631 static const struct got_error *close_ref_view(struct tog_view *);
632 static const struct got_error *search_start_ref_view(struct tog_view *);
633 static const struct got_error *search_next_ref_view(struct tog_view *);
634 
635 static volatile sig_atomic_t tog_sigwinch_received;
636 static volatile sig_atomic_t tog_sigpipe_received;
637 static volatile sig_atomic_t tog_sigcont_received;
638 static volatile sig_atomic_t tog_sigint_received;
639 static volatile sig_atomic_t tog_sigterm_received;
640 
641 static void
642 tog_sigwinch(int signo)
643 {
644 	tog_sigwinch_received = 1;
645 }
646 
647 static void
648 tog_sigpipe(int signo)
649 {
650 	tog_sigpipe_received = 1;
651 }
652 
653 static void
654 tog_sigcont(int signo)
655 {
656 	tog_sigcont_received = 1;
657 }
658 
659 static void
660 tog_sigint(int signo)
661 {
662 	tog_sigint_received = 1;
663 }
664 
665 static void
666 tog_sigterm(int signo)
667 {
668 	tog_sigterm_received = 1;
669 }
670 
671 static int
672 tog_fatal_signal_received(void)
673 {
674 	return (tog_sigpipe_received ||
675 	    tog_sigint_received || tog_sigint_received);
676 }
677 
678 static const struct got_error *
679 view_close(struct tog_view *view)
680 {
681 	const struct got_error *err = NULL, *child_err = NULL;
682 
683 	if (view->child) {
684 		child_err = view_close(view->child);
685 		view->child = NULL;
686 	}
687 	if (view->close)
688 		err = view->close(view);
689 	if (view->panel)
690 		del_panel(view->panel);
691 	if (view->window)
692 		delwin(view->window);
693 	free(view);
694 	return err ? err : child_err;
695 }
696 
697 static struct tog_view *
698 view_open(int nlines, int ncols, int begin_y, int begin_x,
699     enum tog_view_type type)
700 {
701 	struct tog_view *view = calloc(1, sizeof(*view));
702 
703 	if (view == NULL)
704 		return NULL;
705 
706 	view->type = type;
707 	view->lines = LINES;
708 	view->cols = COLS;
709 	view->nlines = nlines ? nlines : LINES - begin_y;
710 	view->ncols = ncols ? ncols : COLS - begin_x;
711 	view->begin_y = begin_y;
712 	view->begin_x = begin_x;
713 	view->window = newwin(nlines, ncols, begin_y, begin_x);
714 	if (view->window == NULL) {
715 		view_close(view);
716 		return NULL;
717 	}
718 	view->panel = new_panel(view->window);
719 	if (view->panel == NULL ||
720 	    set_panel_userptr(view->panel, view) != OK) {
721 		view_close(view);
722 		return NULL;
723 	}
724 
725 	keypad(view->window, TRUE);
726 	return view;
727 }
728 
729 static int
730 view_split_begin_x(int begin_x)
731 {
732 	if (begin_x > 0 || COLS < 120)
733 		return 0;
734 	return (COLS - MAX(COLS / 2, 80));
735 }
736 
737 /* XXX Stub till we decide what to do. */
738 static int
739 view_split_begin_y(int lines)
740 {
741 	return lines * HSPLIT_SCALE;
742 }
743 
744 static const struct got_error *view_resize(struct tog_view *);
745 
746 static const struct got_error *
747 view_splitscreen(struct tog_view *view)
748 {
749 	const struct got_error *err = NULL;
750 
751 	if (!view->resized && view->mode == TOG_VIEW_SPLIT_HRZN) {
752 		if (view->resized_y && view->resized_y < view->lines)
753 			view->begin_y = view->resized_y;
754 		else
755 			view->begin_y = view_split_begin_y(view->nlines);
756 		view->begin_x = 0;
757 	} else if (!view->resized) {
758 		if (view->resized_x && view->resized_x < view->cols - 1 &&
759 		    view->cols > 119)
760 			view->begin_x = view->resized_x;
761 		else
762 			view->begin_x = view_split_begin_x(0);
763 		view->begin_y = 0;
764 	}
765 	view->nlines = LINES - view->begin_y;
766 	view->ncols = COLS - view->begin_x;
767 	view->lines = LINES;
768 	view->cols = COLS;
769 	err = view_resize(view);
770 	if (err)
771 		return err;
772 
773 	if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN)
774 		view->parent->nlines = view->begin_y;
775 
776 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
777 		return got_error_from_errno("mvwin");
778 
779 	return NULL;
780 }
781 
782 static const struct got_error *
783 view_fullscreen(struct tog_view *view)
784 {
785 	const struct got_error *err = NULL;
786 
787 	view->begin_x = 0;
788 	view->begin_y = view->resized ? view->begin_y : 0;
789 	view->nlines = view->resized ? view->nlines : LINES;
790 	view->ncols = COLS;
791 	view->lines = LINES;
792 	view->cols = COLS;
793 	err = view_resize(view);
794 	if (err)
795 		return err;
796 
797 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
798 		return got_error_from_errno("mvwin");
799 
800 	return NULL;
801 }
802 
803 static int
804 view_is_parent_view(struct tog_view *view)
805 {
806 	return view->parent == NULL;
807 }
808 
809 static int
810 view_is_splitscreen(struct tog_view *view)
811 {
812 	return view->begin_x > 0 || view->begin_y > 0;
813 }
814 
815 static int
816 view_is_fullscreen(struct tog_view *view)
817 {
818 	return view->nlines == LINES && view->ncols == COLS;
819 }
820 
821 static int
822 view_is_hsplit_top(struct tog_view *view)
823 {
824 	return view->mode == TOG_VIEW_SPLIT_HRZN && view->child &&
825 	    view_is_splitscreen(view->child);
826 }
827 
828 static void
829 view_border(struct tog_view *view)
830 {
831 	PANEL *panel;
832 	const struct tog_view *view_above;
833 
834 	if (view->parent)
835 		return view_border(view->parent);
836 
837 	panel = panel_above(view->panel);
838 	if (panel == NULL)
839 		return;
840 
841 	view_above = panel_userptr(panel);
842 	if (view->mode == TOG_VIEW_SPLIT_HRZN)
843 		mvwhline(view->window, view_above->begin_y - 1,
844 		    view->begin_x, got_locale_is_utf8() ?
845 		    ACS_HLINE : '-', view->ncols);
846 	else
847 		mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
848 		    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
849 }
850 
851 static const struct got_error *view_init_hsplit(struct tog_view *, int);
852 static const struct got_error *request_log_commits(struct tog_view *);
853 static const struct got_error *offset_selection_down(struct tog_view *);
854 static void offset_selection_up(struct tog_view *);
855 static void view_get_split(struct tog_view *, int *, int *);
856 
857 static const struct got_error *
858 view_resize(struct tog_view *view)
859 {
860 	const struct got_error	*err = NULL;
861 	int			 dif, nlines, ncols;
862 
863 	dif = LINES - view->lines;  /* line difference */
864 
865 	if (view->lines > LINES)
866 		nlines = view->nlines - (view->lines - LINES);
867 	else
868 		nlines = view->nlines + (LINES - view->lines);
869 	if (view->cols > COLS)
870 		ncols = view->ncols - (view->cols - COLS);
871 	else
872 		ncols = view->ncols + (COLS - view->cols);
873 
874 	if (view->child) {
875 		int hs = view->child->begin_y;
876 
877 		if (!view_is_fullscreen(view))
878 			view->child->begin_x = view_split_begin_x(view->begin_x);
879 		if (view->mode == TOG_VIEW_SPLIT_HRZN ||
880 		    view->child->begin_x == 0) {
881 			ncols = COLS;
882 
883 			view_fullscreen(view->child);
884 			if (view->child->focussed)
885 				show_panel(view->child->panel);
886 			else
887 				show_panel(view->panel);
888 		} else {
889 			ncols = view->child->begin_x;
890 
891 			view_splitscreen(view->child);
892 			show_panel(view->child->panel);
893 		}
894 		/*
895 		 * XXX This is ugly and needs to be moved into the above
896 		 * logic but "works" for now and my attempts at moving it
897 		 * break either 'tab' or 'F' key maps in horizontal splits.
898 		 */
899 		if (hs) {
900 			err = view_splitscreen(view->child);
901 			if (err)
902 				return err;
903 			if (dif < 0) { /* top split decreased */
904 				err = offset_selection_down(view);
905 				if (err)
906 					return err;
907 			}
908 			view_border(view);
909 			update_panels();
910 			doupdate();
911 			show_panel(view->child->panel);
912 			nlines = view->nlines;
913 		}
914 	} else if (view->parent == NULL)
915 		ncols = COLS;
916 
917 	if (view->resize && dif > 0) {
918 		err = view->resize(view, dif);
919 		if (err)
920 			return err;
921 	}
922 
923 	if (wresize(view->window, nlines, ncols) == ERR)
924 		return got_error_from_errno("wresize");
925 	if (replace_panel(view->panel, view->window) == ERR)
926 		return got_error_from_errno("replace_panel");
927 	wclear(view->window);
928 
929 	view->nlines = nlines;
930 	view->ncols = ncols;
931 	view->lines = LINES;
932 	view->cols = COLS;
933 
934 	return NULL;
935 }
936 
937 static const struct got_error *
938 resize_log_view(struct tog_view *view, int increase)
939 {
940 	struct tog_log_view_state	*s = &view->state.log;
941 	const struct got_error		*err = NULL;
942 	int				 n = 0;
943 
944 	if (s->selected_entry)
945 		n = s->selected_entry->idx + view->lines - s->selected;
946 
947 	/*
948 	 * Request commits to account for the increased
949 	 * height so we have enough to populate the view.
950 	 */
951 	if (s->commits->ncommits < n) {
952 		view->nscrolled = n - s->commits->ncommits + increase + 1;
953 		err = request_log_commits(view);
954 	}
955 
956 	return err;
957 }
958 
959 static void
960 view_adjust_offset(struct tog_view *view, int n)
961 {
962 	if (n == 0)
963 		return;
964 
965 	if (view->parent && view->parent->offset) {
966 		if (view->parent->offset + n >= 0)
967 			view->parent->offset += n;
968 		else
969 			view->parent->offset = 0;
970 	} else if (view->offset) {
971 		if (view->offset - n >= 0)
972 			view->offset -= n;
973 		else
974 			view->offset = 0;
975 	}
976 }
977 
978 static const struct got_error *
979 view_resize_split(struct tog_view *view, int resize)
980 {
981 	const struct got_error	*err = NULL;
982 	struct tog_view		*v = NULL;
983 
984 	if (view->parent)
985 		v = view->parent;
986 	else
987 		v = view;
988 
989 	if (!v->child || !view_is_splitscreen(v->child))
990 		return NULL;
991 
992 	v->resized = v->child->resized = resize;  /* lock for resize event */
993 
994 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
995 		if (v->child->resized_y)
996 			v->child->begin_y = v->child->resized_y;
997 		if (view->parent)
998 			v->child->begin_y -= resize;
999 		else
1000 			v->child->begin_y += resize;
1001 		if (v->child->begin_y < 3) {
1002 			view->count = 0;
1003 			v->child->begin_y = 3;
1004 		} else if (v->child->begin_y > LINES - 1) {
1005 			view->count = 0;
1006 			v->child->begin_y = LINES - 1;
1007 		}
1008 		v->ncols = COLS;
1009 		v->child->ncols = COLS;
1010 		view_adjust_offset(view, resize);
1011 		err = view_init_hsplit(v, v->child->begin_y);
1012 		if (err)
1013 			return err;
1014 		v->child->resized_y = v->child->begin_y;
1015 	} else {
1016 		if (v->child->resized_x)
1017 			v->child->begin_x = v->child->resized_x;
1018 		if (view->parent)
1019 			v->child->begin_x -= resize;
1020 		else
1021 			v->child->begin_x += resize;
1022 		if (v->child->begin_x < 11) {
1023 			view->count = 0;
1024 			v->child->begin_x = 11;
1025 		} else if (v->child->begin_x > COLS - 1) {
1026 			view->count = 0;
1027 			v->child->begin_x = COLS - 1;
1028 		}
1029 		v->child->resized_x = v->child->begin_x;
1030 	}
1031 
1032 	v->child->mode = v->mode;
1033 	v->child->nlines = v->lines - v->child->begin_y;
1034 	v->child->ncols = v->cols - v->child->begin_x;
1035 	v->focus_child = 1;
1036 
1037 	err = view_fullscreen(v);
1038 	if (err)
1039 		return err;
1040 	err = view_splitscreen(v->child);
1041 	if (err)
1042 		return err;
1043 
1044 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1045 		err = offset_selection_down(v->child);
1046 		if (err)
1047 			return err;
1048 	}
1049 
1050 	if (v->resize)
1051 		err = v->resize(v, 0);
1052 	else if (v->child->resize)
1053 		err = v->child->resize(v->child, 0);
1054 
1055 	v->resized = v->child->resized = 0;
1056 
1057 	return err;
1058 }
1059 
1060 static void
1061 view_transfer_size(struct tog_view *dst, struct tog_view *src)
1062 {
1063 	struct tog_view *v = src->child ? src->child : src;
1064 
1065 	dst->resized_x = v->resized_x;
1066 	dst->resized_y = v->resized_y;
1067 }
1068 
1069 static const struct got_error *
1070 view_close_child(struct tog_view *view)
1071 {
1072 	const struct got_error *err = NULL;
1073 
1074 	if (view->child == NULL)
1075 		return NULL;
1076 
1077 	err = view_close(view->child);
1078 	view->child = NULL;
1079 	return err;
1080 }
1081 
1082 static const struct got_error *
1083 view_set_child(struct tog_view *view, struct tog_view *child)
1084 {
1085 	const struct got_error *err = NULL;
1086 
1087 	view->child = child;
1088 	child->parent = view;
1089 
1090 	err = view_resize(view);
1091 	if (err)
1092 		return err;
1093 
1094 	if (view->child->resized_x || view->child->resized_y)
1095 		err = view_resize_split(view, 0);
1096 
1097 	return err;
1098 }
1099 
1100 static const struct got_error *view_dispatch_request(struct tog_view **,
1101     struct tog_view *, enum tog_view_type, int, int);
1102 
1103 static const struct got_error *
1104 view_request_new(struct tog_view **requested, struct tog_view *view,
1105     enum tog_view_type request)
1106 {
1107 	struct tog_view		*new_view = NULL;
1108 	const struct got_error	*err;
1109 	int			 y = 0, x = 0;
1110 
1111 	*requested = NULL;
1112 
1113 	if (view_is_parent_view(view))
1114 		view_get_split(view, &y, &x);
1115 
1116 	err = view_dispatch_request(&new_view, view, request, y, x);
1117 	if (err)
1118 		return err;
1119 
1120 	if (view_is_parent_view(view) && view->mode == TOG_VIEW_SPLIT_HRZN) {
1121 		err = view_init_hsplit(view, y);
1122 		if (err)
1123 			return err;
1124 	}
1125 
1126 	view->focussed = 0;
1127 	new_view->focussed = 1;
1128 	new_view->mode = view->mode;
1129 	new_view->nlines = view->lines - y;
1130 
1131 	if (view_is_parent_view(view)) {
1132 		view_transfer_size(new_view, view);
1133 		err = view_close_child(view);
1134 		if (err)
1135 			return err;
1136 		err = view_set_child(view, new_view);
1137 		if (err)
1138 			return err;
1139 		view->focus_child = 1;
1140 	} else
1141 		*requested = new_view;
1142 
1143 	return NULL;
1144 }
1145 
1146 static void
1147 tog_resizeterm(void)
1148 {
1149 	int cols, lines;
1150 	struct winsize size;
1151 
1152 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
1153 		cols = 80;     /* Default */
1154 		lines = 24;
1155 	} else {
1156 		cols = size.ws_col;
1157 		lines = size.ws_row;
1158 	}
1159 	resize_term(lines, cols);
1160 }
1161 
1162 static const struct got_error *
1163 view_search_start(struct tog_view *view)
1164 {
1165 	const struct got_error *err = NULL;
1166 	struct tog_view *v = view;
1167 	char pattern[1024];
1168 	int ret;
1169 
1170 	if (view->search_started) {
1171 		regfree(&view->regex);
1172 		view->searching = 0;
1173 		memset(&view->regmatch, 0, sizeof(view->regmatch));
1174 	}
1175 	view->search_started = 0;
1176 
1177 	if (view->nlines < 1)
1178 		return NULL;
1179 
1180 	if (view_is_hsplit_top(view))
1181 		v = view->child;
1182 
1183 	mvwaddstr(v->window, v->nlines - 1, 0, "/");
1184 	wclrtoeol(v->window);
1185 
1186 	nodelay(view->window, FALSE);  /* block for search term input */
1187 	nocbreak();
1188 	echo();
1189 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
1190 	wrefresh(v->window);
1191 	cbreak();
1192 	noecho();
1193 	nodelay(view->window, TRUE);
1194 	if (ret == ERR)
1195 		return NULL;
1196 
1197 	if (regcomp(&view->regex, pattern, REG_EXTENDED | REG_NEWLINE) == 0) {
1198 		err = view->search_start(view);
1199 		if (err) {
1200 			regfree(&view->regex);
1201 			return err;
1202 		}
1203 		view->search_started = 1;
1204 		view->searching = TOG_SEARCH_FORWARD;
1205 		view->search_next_done = 0;
1206 		view->search_next(view);
1207 	}
1208 
1209 	return NULL;
1210 }
1211 
1212 /* Switch split mode. If view is a parent or child, draw the new splitscreen. */
1213 static const struct got_error *
1214 switch_split(struct tog_view *view)
1215 {
1216 	const struct got_error	*err = NULL;
1217 	struct tog_view		*v = NULL;
1218 
1219 	if (view->parent)
1220 		v = view->parent;
1221 	else
1222 		v = view;
1223 
1224 	if (v->mode == TOG_VIEW_SPLIT_HRZN)
1225 		v->mode = TOG_VIEW_SPLIT_VERT;
1226 	else
1227 		v->mode = TOG_VIEW_SPLIT_HRZN;
1228 
1229 	if (!v->child)
1230 		return NULL;
1231 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->cols < 120)
1232 		v->mode = TOG_VIEW_SPLIT_NONE;
1233 
1234 	view_get_split(v, &v->child->begin_y, &v->child->begin_x);
1235 	if (v->mode == TOG_VIEW_SPLIT_HRZN && v->child->resized_y)
1236 		v->child->begin_y = v->child->resized_y;
1237 	else if (v->mode == TOG_VIEW_SPLIT_VERT && v->child->resized_x)
1238 		v->child->begin_x = v->child->resized_x;
1239 
1240 
1241 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1242 		v->ncols = COLS;
1243 		v->child->ncols = COLS;
1244 		v->child->nscrolled = LINES - v->child->nlines;
1245 
1246 		err = view_init_hsplit(v, v->child->begin_y);
1247 		if (err)
1248 			return err;
1249 	}
1250 	v->child->mode = v->mode;
1251 	v->child->nlines = v->lines - v->child->begin_y;
1252 	v->focus_child = 1;
1253 
1254 	err = view_fullscreen(v);
1255 	if (err)
1256 		return err;
1257 	err = view_splitscreen(v->child);
1258 	if (err)
1259 		return err;
1260 
1261 	if (v->mode == TOG_VIEW_SPLIT_NONE)
1262 		v->mode = TOG_VIEW_SPLIT_VERT;
1263 	if (v->mode == TOG_VIEW_SPLIT_HRZN) {
1264 		err = offset_selection_down(v);
1265 		if (err)
1266 			return err;
1267 		err = offset_selection_down(v->child);
1268 		if (err)
1269 			return err;
1270 	} else {
1271 		offset_selection_up(v);
1272 		offset_selection_up(v->child);
1273 	}
1274 	if (v->resize)
1275 		err = v->resize(v, 0);
1276 	else if (v->child->resize)
1277 		err = v->child->resize(v->child, 0);
1278 
1279 	return err;
1280 }
1281 
1282 /*
1283  * Compute view->count from numeric input. Assign total to view->count and
1284  * return first non-numeric key entered.
1285  */
1286 static int
1287 get_compound_key(struct tog_view *view, int c)
1288 {
1289 	struct tog_view	*v = view;
1290 	int		 x, n = 0;
1291 
1292 	if (view_is_hsplit_top(view))
1293 		v = view->child;
1294 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
1295 		v = view->parent;
1296 
1297 	view->count = 0;
1298 	cbreak();  /* block for input */
1299 	nodelay(view->window, FALSE);
1300 	wmove(v->window, v->nlines - 1, 0);
1301 	wclrtoeol(v->window);
1302 	waddch(v->window, ':');
1303 
1304 	do {
1305 		x = getcurx(v->window);
1306 		if (x != ERR && x < view->ncols) {
1307 			waddch(v->window, c);
1308 			wrefresh(v->window);
1309 		}
1310 
1311 		/*
1312 		 * Don't overflow. Max valid request should be the greatest
1313 		 * between the longest and total lines; cap at 10 million.
1314 		 */
1315 		if (n >= 9999999)
1316 			n = 9999999;
1317 		else
1318 			n = n * 10 + (c - '0');
1319 	} while (((c = wgetch(view->window))) >= '0' && c <= '9' && c != ERR);
1320 
1321 	if (c == 'G' || c == 'g') {	/* nG key map */
1322 		view->gline = view->hiline = n;
1323 		n = 0;
1324 		c = 0;
1325 	}
1326 
1327 	/* Massage excessive or inapplicable values at the input handler. */
1328 	view->count = n;
1329 
1330 	return c;
1331 }
1332 
1333 static const struct got_error *
1334 view_input(struct tog_view **new, int *done, struct tog_view *view,
1335     struct tog_view_list_head *views)
1336 {
1337 	const struct got_error *err = NULL;
1338 	struct tog_view *v;
1339 	int ch, errcode;
1340 
1341 	*new = NULL;
1342 
1343 	/* Clear "no matches" indicator. */
1344 	if (view->search_next_done == TOG_SEARCH_NO_MORE ||
1345 	    view->search_next_done == TOG_SEARCH_HAVE_NONE) {
1346 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
1347 		view->count = 0;
1348 	}
1349 
1350 	if (view->searching && !view->search_next_done) {
1351 		errcode = pthread_mutex_unlock(&tog_mutex);
1352 		if (errcode)
1353 			return got_error_set_errno(errcode,
1354 			    "pthread_mutex_unlock");
1355 		sched_yield();
1356 		errcode = pthread_mutex_lock(&tog_mutex);
1357 		if (errcode)
1358 			return got_error_set_errno(errcode,
1359 			    "pthread_mutex_lock");
1360 		view->search_next(view);
1361 		return NULL;
1362 	}
1363 
1364 	/* Allow threads to make progress while we are waiting for input. */
1365 	errcode = pthread_mutex_unlock(&tog_mutex);
1366 	if (errcode)
1367 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
1368 	/* If we have an unfinished count, let C-g or backspace abort. */
1369 	if (view->count && --view->count) {
1370 		cbreak();
1371 		nodelay(view->window, TRUE);
1372 		ch = wgetch(view->window);
1373 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
1374 			view->count = 0;
1375 		else
1376 			ch = view->ch;
1377 	} else {
1378 		ch = wgetch(view->window);
1379 		if (ch >= '1' && ch  <= '9')
1380 			view->ch = ch = get_compound_key(view, ch);
1381 	}
1382 	if (view->hiline && ch != ERR && ch != 0)
1383 		view->hiline = 0;  /* key pressed, clear line highlight */
1384 	nodelay(view->window, TRUE);
1385 	errcode = pthread_mutex_lock(&tog_mutex);
1386 	if (errcode)
1387 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1388 
1389 	if (tog_sigwinch_received || tog_sigcont_received) {
1390 		tog_resizeterm();
1391 		tog_sigwinch_received = 0;
1392 		tog_sigcont_received = 0;
1393 		TAILQ_FOREACH(v, views, entry) {
1394 			err = view_resize(v);
1395 			if (err)
1396 				return err;
1397 			err = v->input(new, v, KEY_RESIZE);
1398 			if (err)
1399 				return err;
1400 			if (v->child) {
1401 				err = view_resize(v->child);
1402 				if (err)
1403 					return err;
1404 				err = v->child->input(new, v->child,
1405 				    KEY_RESIZE);
1406 				if (err)
1407 					return err;
1408 				if (v->child->resized_x || v->child->resized_y) {
1409 					err = view_resize_split(v, 0);
1410 					if (err)
1411 						return err;
1412 				}
1413 			}
1414 		}
1415 	}
1416 
1417 	switch (ch) {
1418 	case '\t':
1419 		view->count = 0;
1420 		if (view->child) {
1421 			view->focussed = 0;
1422 			view->child->focussed = 1;
1423 			view->focus_child = 1;
1424 		} else if (view->parent) {
1425 			view->focussed = 0;
1426 			view->parent->focussed = 1;
1427 			view->parent->focus_child = 0;
1428 			if (!view_is_splitscreen(view)) {
1429 				if (view->parent->resize) {
1430 					err = view->parent->resize(view->parent,
1431 					    0);
1432 					if (err)
1433 						return err;
1434 				}
1435 				offset_selection_up(view->parent);
1436 				err = view_fullscreen(view->parent);
1437 				if (err)
1438 					return err;
1439 			}
1440 		}
1441 		break;
1442 	case 'q':
1443 		if (view->parent && view->mode == TOG_VIEW_SPLIT_HRZN) {
1444 			if (view->parent->resize) {
1445 				/* might need more commits to fill fullscreen */
1446 				err = view->parent->resize(view->parent, 0);
1447 				if (err)
1448 					break;
1449 			}
1450 			offset_selection_up(view->parent);
1451 		}
1452 		err = view->input(new, view, ch);
1453 		view->dying = 1;
1454 		break;
1455 	case 'Q':
1456 		*done = 1;
1457 		break;
1458 	case 'F':
1459 		view->count = 0;
1460 		if (view_is_parent_view(view)) {
1461 			if (view->child == NULL)
1462 				break;
1463 			if (view_is_splitscreen(view->child)) {
1464 				view->focussed = 0;
1465 				view->child->focussed = 1;
1466 				err = view_fullscreen(view->child);
1467 			} else {
1468 				err = view_splitscreen(view->child);
1469 				if (!err)
1470 					err = view_resize_split(view, 0);
1471 			}
1472 			if (err)
1473 				break;
1474 			err = view->child->input(new, view->child,
1475 			    KEY_RESIZE);
1476 		} else {
1477 			if (view_is_splitscreen(view)) {
1478 				view->parent->focussed = 0;
1479 				view->focussed = 1;
1480 				err = view_fullscreen(view);
1481 			} else {
1482 				err = view_splitscreen(view);
1483 				if (!err && view->mode != TOG_VIEW_SPLIT_HRZN)
1484 					err = view_resize(view->parent);
1485 				if (!err)
1486 					err = view_resize_split(view, 0);
1487 			}
1488 			if (err)
1489 				break;
1490 			err = view->input(new, view, KEY_RESIZE);
1491 		}
1492 		if (err)
1493 			break;
1494 		if (view->resize) {
1495 			err = view->resize(view, 0);
1496 			if (err)
1497 				break;
1498 		}
1499 		if (view->parent)
1500 			err = offset_selection_down(view->parent);
1501 		if (!err)
1502 			err = offset_selection_down(view);
1503 		break;
1504 	case 'S':
1505 		view->count = 0;
1506 		err = switch_split(view);
1507 		break;
1508 	case '-':
1509 		err = view_resize_split(view, -1);
1510 		break;
1511 	case '+':
1512 		err = view_resize_split(view, 1);
1513 		break;
1514 	case KEY_RESIZE:
1515 		break;
1516 	case '/':
1517 		view->count = 0;
1518 		if (view->search_start)
1519 			view_search_start(view);
1520 		else
1521 			err = view->input(new, view, ch);
1522 		break;
1523 	case 'N':
1524 	case 'n':
1525 		if (view->search_started && view->search_next) {
1526 			view->searching = (ch == 'n' ?
1527 			    TOG_SEARCH_FORWARD : TOG_SEARCH_BACKWARD);
1528 			view->search_next_done = 0;
1529 			view->search_next(view);
1530 		} else
1531 			err = view->input(new, view, ch);
1532 		break;
1533 	case 'A':
1534 		if (tog_diff_algo == GOT_DIFF_ALGORITHM_MYERS)
1535 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
1536 		else
1537 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
1538 		TAILQ_FOREACH(v, views, entry) {
1539 			if (v->reset) {
1540 				err = v->reset(v);
1541 				if (err)
1542 					return err;
1543 			}
1544 			if (v->child && v->child->reset) {
1545 				err = v->child->reset(v->child);
1546 				if (err)
1547 					return err;
1548 			}
1549 		}
1550 		break;
1551 	default:
1552 		err = view->input(new, view, ch);
1553 		break;
1554 	}
1555 
1556 	return err;
1557 }
1558 
1559 static int
1560 view_needs_focus_indication(struct tog_view *view)
1561 {
1562 	if (view_is_parent_view(view)) {
1563 		if (view->child == NULL || view->child->focussed)
1564 			return 0;
1565 		if (!view_is_splitscreen(view->child))
1566 			return 0;
1567 	} else if (!view_is_splitscreen(view))
1568 		return 0;
1569 
1570 	return view->focussed;
1571 }
1572 
1573 static const struct got_error *
1574 view_loop(struct tog_view *view)
1575 {
1576 	const struct got_error *err = NULL;
1577 	struct tog_view_list_head views;
1578 	struct tog_view *new_view;
1579 	char *mode;
1580 	int fast_refresh = 10;
1581 	int done = 0, errcode;
1582 
1583 	mode = getenv("TOG_VIEW_SPLIT_MODE");
1584 	if (!mode || !(*mode == 'h' || *mode == 'H'))
1585 		view->mode = TOG_VIEW_SPLIT_VERT;
1586 	else
1587 		view->mode = TOG_VIEW_SPLIT_HRZN;
1588 
1589 	errcode = pthread_mutex_lock(&tog_mutex);
1590 	if (errcode)
1591 		return got_error_set_errno(errcode, "pthread_mutex_lock");
1592 
1593 	TAILQ_INIT(&views);
1594 	TAILQ_INSERT_HEAD(&views, view, entry);
1595 
1596 	view->focussed = 1;
1597 	err = view->show(view);
1598 	if (err)
1599 		return err;
1600 	update_panels();
1601 	doupdate();
1602 	while (!TAILQ_EMPTY(&views) && !done && !tog_thread_error &&
1603 	    !tog_fatal_signal_received()) {
1604 		/* Refresh fast during initialization, then become slower. */
1605 		if (fast_refresh && fast_refresh-- == 0)
1606 			halfdelay(10); /* switch to once per second */
1607 
1608 		err = view_input(&new_view, &done, view, &views);
1609 		if (err)
1610 			break;
1611 		if (view->dying) {
1612 			struct tog_view *v, *prev = NULL;
1613 
1614 			if (view_is_parent_view(view))
1615 				prev = TAILQ_PREV(view, tog_view_list_head,
1616 				    entry);
1617 			else if (view->parent)
1618 				prev = view->parent;
1619 
1620 			if (view->parent) {
1621 				view->parent->child = NULL;
1622 				view->parent->focus_child = 0;
1623 				/* Restore fullscreen line height. */
1624 				view->parent->nlines = view->parent->lines;
1625 				err = view_resize(view->parent);
1626 				if (err)
1627 					break;
1628 				/* Make resized splits persist. */
1629 				view_transfer_size(view->parent, view);
1630 			} else
1631 				TAILQ_REMOVE(&views, view, entry);
1632 
1633 			err = view_close(view);
1634 			if (err)
1635 				goto done;
1636 
1637 			view = NULL;
1638 			TAILQ_FOREACH(v, &views, entry) {
1639 				if (v->focussed)
1640 					break;
1641 			}
1642 			if (view == NULL && new_view == NULL) {
1643 				/* No view has focus. Try to pick one. */
1644 				if (prev)
1645 					view = prev;
1646 				else if (!TAILQ_EMPTY(&views)) {
1647 					view = TAILQ_LAST(&views,
1648 					    tog_view_list_head);
1649 				}
1650 				if (view) {
1651 					if (view->focus_child) {
1652 						view->child->focussed = 1;
1653 						view = view->child;
1654 					} else
1655 						view->focussed = 1;
1656 				}
1657 			}
1658 		}
1659 		if (new_view) {
1660 			struct tog_view *v, *t;
1661 			/* Only allow one parent view per type. */
1662 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
1663 				if (v->type != new_view->type)
1664 					continue;
1665 				TAILQ_REMOVE(&views, v, entry);
1666 				err = view_close(v);
1667 				if (err)
1668 					goto done;
1669 				break;
1670 			}
1671 			TAILQ_INSERT_TAIL(&views, new_view, entry);
1672 			view = new_view;
1673 		}
1674 		if (view) {
1675 			if (view_is_parent_view(view)) {
1676 				if (view->child && view->child->focussed)
1677 					view = view->child;
1678 			} else {
1679 				if (view->parent && view->parent->focussed)
1680 					view = view->parent;
1681 			}
1682 			show_panel(view->panel);
1683 			if (view->child && view_is_splitscreen(view->child))
1684 				show_panel(view->child->panel);
1685 			if (view->parent && view_is_splitscreen(view)) {
1686 				err = view->parent->show(view->parent);
1687 				if (err)
1688 					goto done;
1689 			}
1690 			err = view->show(view);
1691 			if (err)
1692 				goto done;
1693 			if (view->child) {
1694 				err = view->child->show(view->child);
1695 				if (err)
1696 					goto done;
1697 			}
1698 			update_panels();
1699 			doupdate();
1700 		}
1701 	}
1702 done:
1703 	while (!TAILQ_EMPTY(&views)) {
1704 		const struct got_error *close_err;
1705 		view = TAILQ_FIRST(&views);
1706 		TAILQ_REMOVE(&views, view, entry);
1707 		close_err = view_close(view);
1708 		if (close_err && err == NULL)
1709 			err = close_err;
1710 	}
1711 
1712 	errcode = pthread_mutex_unlock(&tog_mutex);
1713 	if (errcode && err == NULL)
1714 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
1715 
1716 	return err;
1717 }
1718 
1719 __dead static void
1720 usage_log(void)
1721 {
1722 	endwin();
1723 	fprintf(stderr,
1724 	    "usage: %s log [-b] [-c commit] [-r repository-path] [path]\n",
1725 	    getprogname());
1726 	exit(1);
1727 }
1728 
1729 /* Create newly allocated wide-character string equivalent to a byte string. */
1730 static const struct got_error *
1731 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
1732 {
1733 	char *vis = NULL;
1734 	const struct got_error *err = NULL;
1735 
1736 	*ws = NULL;
1737 	*wlen = mbstowcs(NULL, s, 0);
1738 	if (*wlen == (size_t)-1) {
1739 		int vislen;
1740 		if (errno != EILSEQ)
1741 			return got_error_from_errno("mbstowcs");
1742 
1743 		/* byte string invalid in current encoding; try to "fix" it */
1744 		err = got_mbsavis(&vis, &vislen, s);
1745 		if (err)
1746 			return err;
1747 		*wlen = mbstowcs(NULL, vis, 0);
1748 		if (*wlen == (size_t)-1) {
1749 			err = got_error_from_errno("mbstowcs"); /* give up */
1750 			goto done;
1751 		}
1752 	}
1753 
1754 	*ws = calloc(*wlen + 1, sizeof(**ws));
1755 	if (*ws == NULL) {
1756 		err = got_error_from_errno("calloc");
1757 		goto done;
1758 	}
1759 
1760 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
1761 		err = got_error_from_errno("mbstowcs");
1762 done:
1763 	free(vis);
1764 	if (err) {
1765 		free(*ws);
1766 		*ws = NULL;
1767 		*wlen = 0;
1768 	}
1769 	return err;
1770 }
1771 
1772 static const struct got_error *
1773 expand_tab(char **ptr, const char *src)
1774 {
1775 	char	*dst;
1776 	size_t	 len, n, idx = 0, sz = 0;
1777 
1778 	*ptr = NULL;
1779 	n = len = strlen(src);
1780 	dst = malloc(n + 1);
1781 	if (dst == NULL)
1782 		return got_error_from_errno("malloc");
1783 
1784 	while (idx < len && src[idx]) {
1785 		const char c = src[idx];
1786 
1787 		if (c == '\t') {
1788 			size_t nb = TABSIZE - sz % TABSIZE;
1789 			char *p;
1790 
1791 			p = realloc(dst, n + nb);
1792 			if (p == NULL) {
1793 				free(dst);
1794 				return got_error_from_errno("realloc");
1795 
1796 			}
1797 			dst = p;
1798 			n += nb;
1799 			memset(dst + sz, ' ', nb);
1800 			sz += nb;
1801 		} else
1802 			dst[sz++] = src[idx];
1803 		++idx;
1804 	}
1805 
1806 	dst[sz] = '\0';
1807 	*ptr = dst;
1808 	return NULL;
1809 }
1810 
1811 /*
1812  * Advance at most n columns from wline starting at offset off.
1813  * Return the index to the first character after the span operation.
1814  * Return the combined column width of all spanned wide character in
1815  * *rcol.
1816  */
1817 static int
1818 span_wline(int *rcol, int off, wchar_t *wline, int n, int col_tab_align)
1819 {
1820 	int width, i, cols = 0;
1821 
1822 	if (n == 0) {
1823 		*rcol = cols;
1824 		return off;
1825 	}
1826 
1827 	for (i = off; wline[i] != L'\0'; ++i) {
1828 		if (wline[i] == L'\t')
1829 			width = TABSIZE - ((cols + col_tab_align) % TABSIZE);
1830 		else
1831 			width = wcwidth(wline[i]);
1832 
1833 		if (width == -1) {
1834 			width = 1;
1835 			wline[i] = L'.';
1836 		}
1837 
1838 		if (cols + width > n)
1839 			break;
1840 		cols += width;
1841 	}
1842 
1843 	*rcol = cols;
1844 	return i;
1845 }
1846 
1847 /*
1848  * Format a line for display, ensuring that it won't overflow a width limit.
1849  * With scrolling, the width returned refers to the scrolled version of the
1850  * line, which starts at (*wlinep)[*scrollxp]. The caller must free *wlinep.
1851  */
1852 static const struct got_error *
1853 format_line(wchar_t **wlinep, int *widthp, int *scrollxp,
1854     const char *line, int nscroll, int wlimit, int col_tab_align, int expand)
1855 {
1856 	const struct got_error *err = NULL;
1857 	int cols;
1858 	wchar_t *wline = NULL;
1859 	char *exstr = NULL;
1860 	size_t wlen;
1861 	int i, scrollx;
1862 
1863 	*wlinep = NULL;
1864 	*widthp = 0;
1865 
1866 	if (expand) {
1867 		err = expand_tab(&exstr, line);
1868 		if (err)
1869 			return err;
1870 	}
1871 
1872 	err = mbs2ws(&wline, &wlen, expand ? exstr : line);
1873 	free(exstr);
1874 	if (err)
1875 		return err;
1876 
1877 	scrollx = span_wline(&cols, 0, wline, nscroll, col_tab_align);
1878 
1879 	if (wlen > 0 && wline[wlen - 1] == L'\n') {
1880 		wline[wlen - 1] = L'\0';
1881 		wlen--;
1882 	}
1883 	if (wlen > 0 && wline[wlen - 1] == L'\r') {
1884 		wline[wlen - 1] = L'\0';
1885 		wlen--;
1886 	}
1887 
1888 	i = span_wline(&cols, scrollx, wline, wlimit, col_tab_align);
1889 	wline[i] = L'\0';
1890 
1891 	if (widthp)
1892 		*widthp = cols;
1893 	if (scrollxp)
1894 		*scrollxp = scrollx;
1895 	if (err)
1896 		free(wline);
1897 	else
1898 		*wlinep = wline;
1899 	return err;
1900 }
1901 
1902 static const struct got_error*
1903 build_refs_str(char **refs_str, struct got_reflist_head *refs,
1904     struct got_object_id *id, struct got_repository *repo)
1905 {
1906 	static const struct got_error *err = NULL;
1907 	struct got_reflist_entry *re;
1908 	char *s;
1909 	const char *name;
1910 
1911 	*refs_str = NULL;
1912 
1913 	TAILQ_FOREACH(re, refs, entry) {
1914 		struct got_tag_object *tag = NULL;
1915 		struct got_object_id *ref_id;
1916 		int cmp;
1917 
1918 		name = got_ref_get_name(re->ref);
1919 		if (strcmp(name, GOT_REF_HEAD) == 0)
1920 			continue;
1921 		if (strncmp(name, "refs/", 5) == 0)
1922 			name += 5;
1923 		if (strncmp(name, "got/", 4) == 0 &&
1924 		    strncmp(name, "got/backup/", 11) != 0)
1925 			continue;
1926 		if (strncmp(name, "heads/", 6) == 0)
1927 			name += 6;
1928 		if (strncmp(name, "remotes/", 8) == 0) {
1929 			name += 8;
1930 			s = strstr(name, "/" GOT_REF_HEAD);
1931 			if (s != NULL && s[strlen(s)] == '\0')
1932 				continue;
1933 		}
1934 		err = got_ref_resolve(&ref_id, repo, re->ref);
1935 		if (err)
1936 			break;
1937 		if (strncmp(name, "tags/", 5) == 0) {
1938 			err = got_object_open_as_tag(&tag, repo, ref_id);
1939 			if (err) {
1940 				if (err->code != GOT_ERR_OBJ_TYPE) {
1941 					free(ref_id);
1942 					break;
1943 				}
1944 				/* Ref points at something other than a tag. */
1945 				err = NULL;
1946 				tag = NULL;
1947 			}
1948 		}
1949 		cmp = got_object_id_cmp(tag ?
1950 		    got_object_tag_get_object_id(tag) : ref_id, id);
1951 		free(ref_id);
1952 		if (tag)
1953 			got_object_tag_close(tag);
1954 		if (cmp != 0)
1955 			continue;
1956 		s = *refs_str;
1957 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
1958 		    s ? ", " : "", name) == -1) {
1959 			err = got_error_from_errno("asprintf");
1960 			free(s);
1961 			*refs_str = NULL;
1962 			break;
1963 		}
1964 		free(s);
1965 	}
1966 
1967 	return err;
1968 }
1969 
1970 static const struct got_error *
1971 format_author(wchar_t **wauthor, int *author_width, char *author, int limit,
1972     int col_tab_align)
1973 {
1974 	char *smallerthan;
1975 
1976 	smallerthan = strchr(author, '<');
1977 	if (smallerthan && smallerthan[1] != '\0')
1978 		author = smallerthan + 1;
1979 	author[strcspn(author, "@>")] = '\0';
1980 	return format_line(wauthor, author_width, NULL, author, 0, limit,
1981 	    col_tab_align, 0);
1982 }
1983 
1984 static const struct got_error *
1985 draw_commit(struct tog_view *view, struct got_commit_object *commit,
1986     struct got_object_id *id, const size_t date_display_cols,
1987     int author_display_cols)
1988 {
1989 	struct tog_log_view_state *s = &view->state.log;
1990 	const struct got_error *err = NULL;
1991 	char datebuf[12]; /* YYYY-MM-DD + SPACE + NUL */
1992 	char *logmsg0 = NULL, *logmsg = NULL;
1993 	char *author = NULL;
1994 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
1995 	int author_width, logmsg_width;
1996 	char *newline, *line = NULL;
1997 	int col, limit, scrollx;
1998 	const int avail = view->ncols;
1999 	struct tm tm;
2000 	time_t committer_time;
2001 	struct tog_color *tc;
2002 
2003 	committer_time = got_object_commit_get_committer_time(commit);
2004 	if (gmtime_r(&committer_time, &tm) == NULL)
2005 		return got_error_from_errno("gmtime_r");
2006 	if (strftime(datebuf, sizeof(datebuf), "%G-%m-%d ", &tm) == 0)
2007 		return got_error(GOT_ERR_NO_SPACE);
2008 
2009 	if (avail <= date_display_cols)
2010 		limit = MIN(sizeof(datebuf) - 1, avail);
2011 	else
2012 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
2013 	tc = get_color(&s->colors, TOG_COLOR_DATE);
2014 	if (tc)
2015 		wattr_on(view->window,
2016 		    COLOR_PAIR(tc->colorpair), NULL);
2017 	waddnstr(view->window, datebuf, limit);
2018 	if (tc)
2019 		wattr_off(view->window,
2020 		    COLOR_PAIR(tc->colorpair), NULL);
2021 	col = limit;
2022 	if (col > avail)
2023 		goto done;
2024 
2025 	if (avail >= 120) {
2026 		char *id_str;
2027 		err = got_object_id_str(&id_str, id);
2028 		if (err)
2029 			goto done;
2030 		tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2031 		if (tc)
2032 			wattr_on(view->window,
2033 			    COLOR_PAIR(tc->colorpair), NULL);
2034 		wprintw(view->window, "%.8s ", id_str);
2035 		if (tc)
2036 			wattr_off(view->window,
2037 			    COLOR_PAIR(tc->colorpair), NULL);
2038 		free(id_str);
2039 		col += 9;
2040 		if (col > avail)
2041 			goto done;
2042 	}
2043 
2044 	if (s->use_committer)
2045 		author = strdup(got_object_commit_get_committer(commit));
2046 	else
2047 		author = strdup(got_object_commit_get_author(commit));
2048 	if (author == NULL) {
2049 		err = got_error_from_errno("strdup");
2050 		goto done;
2051 	}
2052 	err = format_author(&wauthor, &author_width, author, avail - col, col);
2053 	if (err)
2054 		goto done;
2055 	tc = get_color(&s->colors, TOG_COLOR_AUTHOR);
2056 	if (tc)
2057 		wattr_on(view->window,
2058 		    COLOR_PAIR(tc->colorpair), NULL);
2059 	waddwstr(view->window, wauthor);
2060 	col += author_width;
2061 	while (col < avail && author_width < author_display_cols + 2) {
2062 		waddch(view->window, ' ');
2063 		col++;
2064 		author_width++;
2065 	}
2066 	if (tc)
2067 		wattr_off(view->window,
2068 		    COLOR_PAIR(tc->colorpair), NULL);
2069 	if (col > avail)
2070 		goto done;
2071 
2072 	err = got_object_commit_get_logmsg(&logmsg0, commit);
2073 	if (err)
2074 		goto done;
2075 	logmsg = logmsg0;
2076 	while (*logmsg == '\n')
2077 		logmsg++;
2078 	newline = strchr(logmsg, '\n');
2079 	if (newline)
2080 		*newline = '\0';
2081 	limit = avail - col;
2082 	if (view->child && !view_is_hsplit_top(view) && limit > 0)
2083 		limit--;	/* for the border */
2084 	err = format_line(&wlogmsg, &logmsg_width, &scrollx, logmsg, view->x,
2085 	    limit, col, 1);
2086 	if (err)
2087 		goto done;
2088 	waddwstr(view->window, &wlogmsg[scrollx]);
2089 	col += MAX(logmsg_width, 0);
2090 	while (col < avail) {
2091 		waddch(view->window, ' ');
2092 		col++;
2093 	}
2094 done:
2095 	free(logmsg0);
2096 	free(wlogmsg);
2097 	free(author);
2098 	free(wauthor);
2099 	free(line);
2100 	return err;
2101 }
2102 
2103 static struct commit_queue_entry *
2104 alloc_commit_queue_entry(struct got_commit_object *commit,
2105     struct got_object_id *id)
2106 {
2107 	struct commit_queue_entry *entry;
2108 	struct got_object_id *dup;
2109 
2110 	entry = calloc(1, sizeof(*entry));
2111 	if (entry == NULL)
2112 		return NULL;
2113 
2114 	dup = got_object_id_dup(id);
2115 	if (dup == NULL) {
2116 		free(entry);
2117 		return NULL;
2118 	}
2119 
2120 	entry->id = dup;
2121 	entry->commit = commit;
2122 	return entry;
2123 }
2124 
2125 static void
2126 pop_commit(struct commit_queue *commits)
2127 {
2128 	struct commit_queue_entry *entry;
2129 
2130 	entry = TAILQ_FIRST(&commits->head);
2131 	TAILQ_REMOVE(&commits->head, entry, entry);
2132 	got_object_commit_close(entry->commit);
2133 	commits->ncommits--;
2134 	free(entry->id);
2135 	free(entry);
2136 }
2137 
2138 static void
2139 free_commits(struct commit_queue *commits)
2140 {
2141 	while (!TAILQ_EMPTY(&commits->head))
2142 		pop_commit(commits);
2143 }
2144 
2145 static const struct got_error *
2146 match_commit(int *have_match, struct got_object_id *id,
2147     struct got_commit_object *commit, regex_t *regex)
2148 {
2149 	const struct got_error *err = NULL;
2150 	regmatch_t regmatch;
2151 	char *id_str = NULL, *logmsg = NULL;
2152 
2153 	*have_match = 0;
2154 
2155 	err = got_object_id_str(&id_str, id);
2156 	if (err)
2157 		return err;
2158 
2159 	err = got_object_commit_get_logmsg(&logmsg, commit);
2160 	if (err)
2161 		goto done;
2162 
2163 	if (regexec(regex, got_object_commit_get_author(commit), 1,
2164 	    &regmatch, 0) == 0 ||
2165 	    regexec(regex, got_object_commit_get_committer(commit), 1,
2166 	    &regmatch, 0) == 0 ||
2167 	    regexec(regex, id_str, 1, &regmatch, 0) == 0 ||
2168 	    regexec(regex, logmsg, 1, &regmatch, 0) == 0)
2169 		*have_match = 1;
2170 done:
2171 	free(id_str);
2172 	free(logmsg);
2173 	return err;
2174 }
2175 
2176 static const struct got_error *
2177 queue_commits(struct tog_log_thread_args *a)
2178 {
2179 	const struct got_error *err = NULL;
2180 
2181 	/*
2182 	 * We keep all commits open throughout the lifetime of the log
2183 	 * view in order to avoid having to re-fetch commits from disk
2184 	 * while updating the display.
2185 	 */
2186 	do {
2187 		struct got_object_id id;
2188 		struct got_commit_object *commit;
2189 		struct commit_queue_entry *entry;
2190 		int limit_match = 0;
2191 		int errcode;
2192 
2193 		err = got_commit_graph_iter_next(&id, a->graph, a->repo,
2194 		    NULL, NULL);
2195 		if (err)
2196 			break;
2197 
2198 		err = got_object_open_as_commit(&commit, a->repo, &id);
2199 		if (err)
2200 			break;
2201 		entry = alloc_commit_queue_entry(commit, &id);
2202 		if (entry == NULL) {
2203 			err = got_error_from_errno("alloc_commit_queue_entry");
2204 			break;
2205 		}
2206 
2207 		errcode = pthread_mutex_lock(&tog_mutex);
2208 		if (errcode) {
2209 			err = got_error_set_errno(errcode,
2210 			    "pthread_mutex_lock");
2211 			break;
2212 		}
2213 
2214 		entry->idx = a->real_commits->ncommits;
2215 		TAILQ_INSERT_TAIL(&a->real_commits->head, entry, entry);
2216 		a->real_commits->ncommits++;
2217 
2218 		if (*a->limiting) {
2219 			err = match_commit(&limit_match, &id, commit,
2220 			    a->limit_regex);
2221 			if (err)
2222 				break;
2223 
2224 			if (limit_match) {
2225 				struct commit_queue_entry *matched;
2226 
2227 				matched = alloc_commit_queue_entry(
2228 				    entry->commit, entry->id);
2229 				if (matched == NULL) {
2230 					err = got_error_from_errno(
2231 					    "alloc_commit_queue_entry");
2232 					break;
2233 				}
2234 
2235 				err = got_object_commit_dup(&matched->commit,
2236 				    entry->commit);
2237 				if (err)
2238 					break;
2239 
2240 				matched->idx = a->limit_commits->ncommits;
2241 				TAILQ_INSERT_TAIL(&a->limit_commits->head,
2242 				    matched, entry);
2243 				a->limit_commits->ncommits++;
2244 			}
2245 
2246 			/*
2247 			 * This is how we signal log_thread() that we
2248 			 * have found a match, and that it should be
2249 			 * counted as a new entry for the view.
2250 			 */
2251 			a->limit_match = limit_match;
2252 		}
2253 
2254 		if (*a->searching == TOG_SEARCH_FORWARD &&
2255 		    !*a->search_next_done) {
2256 			int have_match;
2257 			err = match_commit(&have_match, &id, commit, a->regex);
2258 			if (err)
2259 				break;
2260 
2261 			if (*a->limiting) {
2262 				if (limit_match && have_match)
2263 					*a->search_next_done =
2264 					    TOG_SEARCH_HAVE_MORE;
2265 			} else if (have_match)
2266 				*a->search_next_done = TOG_SEARCH_HAVE_MORE;
2267 		}
2268 
2269 		errcode = pthread_mutex_unlock(&tog_mutex);
2270 		if (errcode && err == NULL)
2271 			err = got_error_set_errno(errcode,
2272 			    "pthread_mutex_unlock");
2273 		if (err)
2274 			break;
2275 	} while (*a->searching == TOG_SEARCH_FORWARD && !*a->search_next_done);
2276 
2277 	return err;
2278 }
2279 
2280 static void
2281 select_commit(struct tog_log_view_state *s)
2282 {
2283 	struct commit_queue_entry *entry;
2284 	int ncommits = 0;
2285 
2286 	entry = s->first_displayed_entry;
2287 	while (entry) {
2288 		if (ncommits == s->selected) {
2289 			s->selected_entry = entry;
2290 			break;
2291 		}
2292 		entry = TAILQ_NEXT(entry, entry);
2293 		ncommits++;
2294 	}
2295 }
2296 
2297 static const struct got_error *
2298 draw_commits(struct tog_view *view)
2299 {
2300 	const struct got_error *err = NULL;
2301 	struct tog_log_view_state *s = &view->state.log;
2302 	struct commit_queue_entry *entry = s->selected_entry;
2303 	int limit = view->nlines;
2304 	int width;
2305 	int ncommits, author_cols = 4;
2306 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
2307 	char *refs_str = NULL;
2308 	wchar_t *wline;
2309 	struct tog_color *tc;
2310 	static const size_t date_display_cols = 12;
2311 
2312 	if (view_is_hsplit_top(view))
2313 		--limit;  /* account for border */
2314 
2315 	if (s->selected_entry &&
2316 	    !(view->searching && view->search_next_done == 0)) {
2317 		struct got_reflist_head *refs;
2318 		err = got_object_id_str(&id_str, s->selected_entry->id);
2319 		if (err)
2320 			return err;
2321 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap,
2322 		    s->selected_entry->id);
2323 		if (refs) {
2324 			err = build_refs_str(&refs_str, refs,
2325 			    s->selected_entry->id, s->repo);
2326 			if (err)
2327 				goto done;
2328 		}
2329 	}
2330 
2331 	if (s->thread_args.commits_needed == 0)
2332 		halfdelay(10); /* disable fast refresh */
2333 
2334 	if (s->thread_args.commits_needed > 0 || s->thread_args.load_all) {
2335 		if (asprintf(&ncommits_str, " [%d/%d] %s",
2336 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2337 		    (view->searching && !view->search_next_done) ?
2338 		    "searching..." : "loading...") == -1) {
2339 			err = got_error_from_errno("asprintf");
2340 			goto done;
2341 		}
2342 	} else {
2343 		const char *search_str = NULL;
2344 		const char *limit_str = NULL;
2345 
2346 		if (view->searching) {
2347 			if (view->search_next_done == TOG_SEARCH_NO_MORE)
2348 				search_str = "no more matches";
2349 			else if (view->search_next_done == TOG_SEARCH_HAVE_NONE)
2350 				search_str = "no matches found";
2351 			else if (!view->search_next_done)
2352 				search_str = "searching...";
2353 		}
2354 
2355 		if (s->limit_view && s->commits->ncommits == 0)
2356 			limit_str = "no matches found";
2357 
2358 		if (asprintf(&ncommits_str, " [%d/%d] %s %s",
2359 		    entry ? entry->idx + 1 : 0, s->commits->ncommits,
2360 		    search_str ? search_str : (refs_str ? refs_str : ""),
2361 		    limit_str ? limit_str : "") == -1) {
2362 			err = got_error_from_errno("asprintf");
2363 			goto done;
2364 		}
2365 	}
2366 
2367 	if (s->in_repo_path && strcmp(s->in_repo_path, "/") != 0) {
2368 		if (asprintf(&header, "commit %s %s%s", id_str ? id_str :
2369 		    "........................................",
2370 		    s->in_repo_path, ncommits_str) == -1) {
2371 			err = got_error_from_errno("asprintf");
2372 			header = NULL;
2373 			goto done;
2374 		}
2375 	} else if (asprintf(&header, "commit %s%s",
2376 	    id_str ? id_str : "........................................",
2377 	    ncommits_str) == -1) {
2378 		err = got_error_from_errno("asprintf");
2379 		header = NULL;
2380 		goto done;
2381 	}
2382 	err = format_line(&wline, &width, NULL, header, 0, view->ncols, 0, 0);
2383 	if (err)
2384 		goto done;
2385 
2386 	werase(view->window);
2387 
2388 	if (view_needs_focus_indication(view))
2389 		wstandout(view->window);
2390 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
2391 	if (tc)
2392 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
2393 	waddwstr(view->window, wline);
2394 	while (width < view->ncols) {
2395 		waddch(view->window, ' ');
2396 		width++;
2397 	}
2398 	if (tc)
2399 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
2400 	if (view_needs_focus_indication(view))
2401 		wstandend(view->window);
2402 	free(wline);
2403 	if (limit <= 1)
2404 		goto done;
2405 
2406 	/* Grow author column size if necessary, and set view->maxx. */
2407 	entry = s->first_displayed_entry;
2408 	ncommits = 0;
2409 	view->maxx = 0;
2410 	while (entry) {
2411 		struct got_commit_object *c = entry->commit;
2412 		char *author, *eol, *msg, *msg0;
2413 		wchar_t *wauthor, *wmsg;
2414 		int width;
2415 		if (ncommits >= limit - 1)
2416 			break;
2417 		if (s->use_committer)
2418 			author = strdup(got_object_commit_get_committer(c));
2419 		else
2420 			author = strdup(got_object_commit_get_author(c));
2421 		if (author == NULL) {
2422 			err = got_error_from_errno("strdup");
2423 			goto done;
2424 		}
2425 		err = format_author(&wauthor, &width, author, COLS,
2426 		    date_display_cols);
2427 		if (author_cols < width)
2428 			author_cols = width;
2429 		free(wauthor);
2430 		free(author);
2431 		if (err)
2432 			goto done;
2433 		err = got_object_commit_get_logmsg(&msg0, c);
2434 		if (err)
2435 			goto done;
2436 		msg = msg0;
2437 		while (*msg == '\n')
2438 			++msg;
2439 		if ((eol = strchr(msg, '\n')))
2440 			*eol = '\0';
2441 		err = format_line(&wmsg, &width, NULL, msg, 0, INT_MAX,
2442 		    date_display_cols + author_cols, 0);
2443 		if (err)
2444 			goto done;
2445 		view->maxx = MAX(view->maxx, width);
2446 		free(msg0);
2447 		free(wmsg);
2448 		ncommits++;
2449 		entry = TAILQ_NEXT(entry, entry);
2450 	}
2451 
2452 	entry = s->first_displayed_entry;
2453 	s->last_displayed_entry = s->first_displayed_entry;
2454 	ncommits = 0;
2455 	while (entry) {
2456 		if (ncommits >= limit - 1)
2457 			break;
2458 		if (ncommits == s->selected)
2459 			wstandout(view->window);
2460 		err = draw_commit(view, entry->commit, entry->id,
2461 		    date_display_cols, author_cols);
2462 		if (ncommits == s->selected)
2463 			wstandend(view->window);
2464 		if (err)
2465 			goto done;
2466 		ncommits++;
2467 		s->last_displayed_entry = entry;
2468 		entry = TAILQ_NEXT(entry, entry);
2469 	}
2470 
2471 	view_border(view);
2472 done:
2473 	free(id_str);
2474 	free(refs_str);
2475 	free(ncommits_str);
2476 	free(header);
2477 	return err;
2478 }
2479 
2480 static void
2481 log_scroll_up(struct tog_log_view_state *s, int maxscroll)
2482 {
2483 	struct commit_queue_entry *entry;
2484 	int nscrolled = 0;
2485 
2486 	entry = TAILQ_FIRST(&s->commits->head);
2487 	if (s->first_displayed_entry == entry)
2488 		return;
2489 
2490 	entry = s->first_displayed_entry;
2491 	while (entry && nscrolled < maxscroll) {
2492 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
2493 		if (entry) {
2494 			s->first_displayed_entry = entry;
2495 			nscrolled++;
2496 		}
2497 	}
2498 }
2499 
2500 static const struct got_error *
2501 trigger_log_thread(struct tog_view *view, int wait)
2502 {
2503 	struct tog_log_thread_args *ta = &view->state.log.thread_args;
2504 	int errcode;
2505 
2506 	halfdelay(1); /* fast refresh while loading commits */
2507 
2508 	while (!ta->log_complete && !tog_thread_error &&
2509 	    (ta->commits_needed > 0 || ta->load_all)) {
2510 		/* Wake the log thread. */
2511 		errcode = pthread_cond_signal(&ta->need_commits);
2512 		if (errcode)
2513 			return got_error_set_errno(errcode,
2514 			    "pthread_cond_signal");
2515 
2516 		/*
2517 		 * The mutex will be released while the view loop waits
2518 		 * in wgetch(), at which time the log thread will run.
2519 		 */
2520 		if (!wait)
2521 			break;
2522 
2523 		/* Display progress update in log view. */
2524 		show_log_view(view);
2525 		update_panels();
2526 		doupdate();
2527 
2528 		/* Wait right here while next commit is being loaded. */
2529 		errcode = pthread_cond_wait(&ta->commit_loaded, &tog_mutex);
2530 		if (errcode)
2531 			return got_error_set_errno(errcode,
2532 			    "pthread_cond_wait");
2533 
2534 		/* Display progress update in log view. */
2535 		show_log_view(view);
2536 		update_panels();
2537 		doupdate();
2538 	}
2539 
2540 	return NULL;
2541 }
2542 
2543 static const struct got_error *
2544 request_log_commits(struct tog_view *view)
2545 {
2546 	struct tog_log_view_state	*state = &view->state.log;
2547 	const struct got_error		*err = NULL;
2548 
2549 	if (state->thread_args.log_complete)
2550 		return NULL;
2551 
2552 	state->thread_args.commits_needed += view->nscrolled;
2553 	err = trigger_log_thread(view, 1);
2554 	view->nscrolled = 0;
2555 
2556 	return err;
2557 }
2558 
2559 static const struct got_error *
2560 log_scroll_down(struct tog_view *view, int maxscroll)
2561 {
2562 	struct tog_log_view_state *s = &view->state.log;
2563 	const struct got_error *err = NULL;
2564 	struct commit_queue_entry *pentry;
2565 	int nscrolled = 0, ncommits_needed;
2566 
2567 	if (s->last_displayed_entry == NULL)
2568 		return NULL;
2569 
2570 	ncommits_needed = s->last_displayed_entry->idx + 1 + maxscroll;
2571 	if (s->commits->ncommits < ncommits_needed &&
2572 	    !s->thread_args.log_complete) {
2573 		/*
2574 		 * Ask the log thread for required amount of commits.
2575 		 */
2576 		s->thread_args.commits_needed +=
2577 		    ncommits_needed - s->commits->ncommits;
2578 		err = trigger_log_thread(view, 1);
2579 		if (err)
2580 			return err;
2581 	}
2582 
2583 	do {
2584 		pentry = TAILQ_NEXT(s->last_displayed_entry, entry);
2585 		if (pentry == NULL && view->mode != TOG_VIEW_SPLIT_HRZN)
2586 			break;
2587 
2588 		s->last_displayed_entry = pentry ?
2589 		    pentry : s->last_displayed_entry;;
2590 
2591 		pentry = TAILQ_NEXT(s->first_displayed_entry, entry);
2592 		if (pentry == NULL)
2593 			break;
2594 		s->first_displayed_entry = pentry;
2595 	} while (++nscrolled < maxscroll);
2596 
2597 	if (view->mode == TOG_VIEW_SPLIT_HRZN && !s->thread_args.log_complete)
2598 		view->nscrolled += nscrolled;
2599 	else
2600 		view->nscrolled = 0;
2601 
2602 	return err;
2603 }
2604 
2605 static const struct got_error *
2606 open_diff_view_for_commit(struct tog_view **new_view, int begin_y, int begin_x,
2607     struct got_commit_object *commit, struct got_object_id *commit_id,
2608     struct tog_view *log_view, struct got_repository *repo)
2609 {
2610 	const struct got_error *err;
2611 	struct got_object_qid *parent_id;
2612 	struct tog_view *diff_view;
2613 
2614 	diff_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_DIFF);
2615 	if (diff_view == NULL)
2616 		return got_error_from_errno("view_open");
2617 
2618 	parent_id = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
2619 	err = open_diff_view(diff_view, parent_id ? &parent_id->id : NULL,
2620 	    commit_id, NULL, NULL, 3, 0, 0, log_view, repo);
2621 	if (err == NULL)
2622 		*new_view = diff_view;
2623 	return err;
2624 }
2625 
2626 static const struct got_error *
2627 tree_view_visit_subtree(struct tog_tree_view_state *s,
2628     struct got_tree_object *subtree)
2629 {
2630 	struct tog_parent_tree *parent;
2631 
2632 	parent = calloc(1, sizeof(*parent));
2633 	if (parent == NULL)
2634 		return got_error_from_errno("calloc");
2635 
2636 	parent->tree = s->tree;
2637 	parent->first_displayed_entry = s->first_displayed_entry;
2638 	parent->selected_entry = s->selected_entry;
2639 	parent->selected = s->selected;
2640 	TAILQ_INSERT_HEAD(&s->parents, parent, entry);
2641 	s->tree = subtree;
2642 	s->selected = 0;
2643 	s->first_displayed_entry = NULL;
2644 	return NULL;
2645 }
2646 
2647 static const struct got_error *
2648 tree_view_walk_path(struct tog_tree_view_state *s,
2649     struct got_commit_object *commit, const char *path)
2650 {
2651 	const struct got_error *err = NULL;
2652 	struct got_tree_object *tree = NULL;
2653 	const char *p;
2654 	char *slash, *subpath = NULL;
2655 
2656 	/* Walk the path and open corresponding tree objects. */
2657 	p = path;
2658 	while (*p) {
2659 		struct got_tree_entry *te;
2660 		struct got_object_id *tree_id;
2661 		char *te_name;
2662 
2663 		while (p[0] == '/')
2664 			p++;
2665 
2666 		/* Ensure the correct subtree entry is selected. */
2667 		slash = strchr(p, '/');
2668 		if (slash == NULL)
2669 			te_name = strdup(p);
2670 		else
2671 			te_name = strndup(p, slash - p);
2672 		if (te_name == NULL) {
2673 			err = got_error_from_errno("strndup");
2674 			break;
2675 		}
2676 		te = got_object_tree_find_entry(s->tree, te_name);
2677 		if (te == NULL) {
2678 			err = got_error_path(te_name, GOT_ERR_NO_TREE_ENTRY);
2679 			free(te_name);
2680 			break;
2681 		}
2682 		free(te_name);
2683 		s->first_displayed_entry = s->selected_entry = te;
2684 
2685 		if (!S_ISDIR(got_tree_entry_get_mode(s->selected_entry)))
2686 			break; /* jump to this file's entry */
2687 
2688 		slash = strchr(p, '/');
2689 		if (slash)
2690 			subpath = strndup(path, slash - path);
2691 		else
2692 			subpath = strdup(path);
2693 		if (subpath == NULL) {
2694 			err = got_error_from_errno("strdup");
2695 			break;
2696 		}
2697 
2698 		err = got_object_id_by_path(&tree_id, s->repo, commit,
2699 		    subpath);
2700 		if (err)
2701 			break;
2702 
2703 		err = got_object_open_as_tree(&tree, s->repo, tree_id);
2704 		free(tree_id);
2705 		if (err)
2706 			break;
2707 
2708 		err = tree_view_visit_subtree(s, tree);
2709 		if (err) {
2710 			got_object_tree_close(tree);
2711 			break;
2712 		}
2713 		if (slash == NULL)
2714 			break;
2715 		free(subpath);
2716 		subpath = NULL;
2717 		p = slash;
2718 	}
2719 
2720 	free(subpath);
2721 	return err;
2722 }
2723 
2724 static const struct got_error *
2725 browse_commit_tree(struct tog_view **new_view, int begin_y, int begin_x,
2726     struct commit_queue_entry *entry, const char *path,
2727     const char *head_ref_name, struct got_repository *repo)
2728 {
2729 	const struct got_error *err = NULL;
2730 	struct tog_tree_view_state *s;
2731 	struct tog_view *tree_view;
2732 
2733 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
2734 	if (tree_view == NULL)
2735 		return got_error_from_errno("view_open");
2736 
2737 	err = open_tree_view(tree_view, entry->id, head_ref_name, repo);
2738 	if (err)
2739 		return err;
2740 	s = &tree_view->state.tree;
2741 
2742 	*new_view = tree_view;
2743 
2744 	if (got_path_is_root_dir(path))
2745 		return NULL;
2746 
2747 	return tree_view_walk_path(s, entry->commit, path);
2748 }
2749 
2750 static const struct got_error *
2751 block_signals_used_by_main_thread(void)
2752 {
2753 	sigset_t sigset;
2754 	int errcode;
2755 
2756 	if (sigemptyset(&sigset) == -1)
2757 		return got_error_from_errno("sigemptyset");
2758 
2759 	/* tog handles SIGWINCH, SIGCONT, SIGINT, SIGTERM */
2760 	if (sigaddset(&sigset, SIGWINCH) == -1)
2761 		return got_error_from_errno("sigaddset");
2762 	if (sigaddset(&sigset, SIGCONT) == -1)
2763 		return got_error_from_errno("sigaddset");
2764 	if (sigaddset(&sigset, SIGINT) == -1)
2765 		return got_error_from_errno("sigaddset");
2766 	if (sigaddset(&sigset, SIGTERM) == -1)
2767 		return got_error_from_errno("sigaddset");
2768 
2769 	/* ncurses handles SIGTSTP */
2770 	if (sigaddset(&sigset, SIGTSTP) == -1)
2771 		return got_error_from_errno("sigaddset");
2772 
2773 	errcode = pthread_sigmask(SIG_BLOCK, &sigset, NULL);
2774 	if (errcode)
2775 		return got_error_set_errno(errcode, "pthread_sigmask");
2776 
2777 	return NULL;
2778 }
2779 
2780 static void *
2781 log_thread(void *arg)
2782 {
2783 	const struct got_error *err = NULL;
2784 	int errcode = 0;
2785 	struct tog_log_thread_args *a = arg;
2786 	int done = 0;
2787 
2788 	/*
2789 	 * Sync startup with main thread such that we begin our
2790 	 * work once view_input() has released the mutex.
2791 	 */
2792 	errcode = pthread_mutex_lock(&tog_mutex);
2793 	if (errcode) {
2794 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
2795 		return (void *)err;
2796 	}
2797 
2798 	err = block_signals_used_by_main_thread();
2799 	if (err) {
2800 		pthread_mutex_unlock(&tog_mutex);
2801 		goto done;
2802 	}
2803 
2804 	while (!done && !err && !tog_fatal_signal_received()) {
2805 		errcode = pthread_mutex_unlock(&tog_mutex);
2806 		if (errcode) {
2807 			err = got_error_set_errno(errcode,
2808 			    "pthread_mutex_unlock");
2809 			goto done;
2810 		}
2811 		err = queue_commits(a);
2812 		if (err) {
2813 			if (err->code != GOT_ERR_ITER_COMPLETED)
2814 				goto done;
2815 			err = NULL;
2816 			done = 1;
2817 		} else if (a->commits_needed > 0 && !a->load_all) {
2818 			if (*a->limiting) {
2819 				if (a->limit_match)
2820 					a->commits_needed--;
2821 			} else
2822 				a->commits_needed--;
2823 		}
2824 
2825 		errcode = pthread_mutex_lock(&tog_mutex);
2826 		if (errcode) {
2827 			err = got_error_set_errno(errcode,
2828 			    "pthread_mutex_lock");
2829 			goto done;
2830 		} else if (*a->quit)
2831 			done = 1;
2832 		else if (*a->limiting && *a->first_displayed_entry == NULL) {
2833 			*a->first_displayed_entry =
2834 			    TAILQ_FIRST(&a->limit_commits->head);
2835 			*a->selected_entry = *a->first_displayed_entry;
2836 		} else if (*a->first_displayed_entry == NULL) {
2837 			*a->first_displayed_entry =
2838 			    TAILQ_FIRST(&a->real_commits->head);
2839 			*a->selected_entry = *a->first_displayed_entry;
2840 		}
2841 
2842 		errcode = pthread_cond_signal(&a->commit_loaded);
2843 		if (errcode) {
2844 			err = got_error_set_errno(errcode,
2845 			    "pthread_cond_signal");
2846 			pthread_mutex_unlock(&tog_mutex);
2847 			goto done;
2848 		}
2849 
2850 		if (done)
2851 			a->commits_needed = 0;
2852 		else {
2853 			if (a->commits_needed == 0 && !a->load_all) {
2854 				errcode = pthread_cond_wait(&a->need_commits,
2855 				    &tog_mutex);
2856 				if (errcode) {
2857 					err = got_error_set_errno(errcode,
2858 					    "pthread_cond_wait");
2859 					pthread_mutex_unlock(&tog_mutex);
2860 					goto done;
2861 				}
2862 				if (*a->quit)
2863 					done = 1;
2864 			}
2865 		}
2866 	}
2867 	a->log_complete = 1;
2868 	errcode = pthread_mutex_unlock(&tog_mutex);
2869 	if (errcode)
2870 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2871 done:
2872 	if (err) {
2873 		tog_thread_error = 1;
2874 		pthread_cond_signal(&a->commit_loaded);
2875 	}
2876 	return (void *)err;
2877 }
2878 
2879 static const struct got_error *
2880 stop_log_thread(struct tog_log_view_state *s)
2881 {
2882 	const struct got_error *err = NULL, *thread_err = NULL;
2883 	int errcode;
2884 
2885 	if (s->thread) {
2886 		s->quit = 1;
2887 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
2888 		if (errcode)
2889 			return got_error_set_errno(errcode,
2890 			    "pthread_cond_signal");
2891 		errcode = pthread_mutex_unlock(&tog_mutex);
2892 		if (errcode)
2893 			return got_error_set_errno(errcode,
2894 			    "pthread_mutex_unlock");
2895 		errcode = pthread_join(s->thread, (void **)&thread_err);
2896 		if (errcode)
2897 			return got_error_set_errno(errcode, "pthread_join");
2898 		errcode = pthread_mutex_lock(&tog_mutex);
2899 		if (errcode)
2900 			return got_error_set_errno(errcode,
2901 			    "pthread_mutex_lock");
2902 		s->thread = 0; //NULL;
2903 	}
2904 
2905 	if (s->thread_args.repo) {
2906 		err = got_repo_close(s->thread_args.repo);
2907 		s->thread_args.repo = NULL;
2908 	}
2909 
2910 	if (s->thread_args.pack_fds) {
2911 		const struct got_error *pack_err =
2912 		    got_repo_pack_fds_close(s->thread_args.pack_fds);
2913 		if (err == NULL)
2914 			err = pack_err;
2915 		s->thread_args.pack_fds = NULL;
2916 	}
2917 
2918 	if (s->thread_args.graph) {
2919 		got_commit_graph_close(s->thread_args.graph);
2920 		s->thread_args.graph = NULL;
2921 	}
2922 
2923 	return err ? err : thread_err;
2924 }
2925 
2926 static const struct got_error *
2927 close_log_view(struct tog_view *view)
2928 {
2929 	const struct got_error *err = NULL;
2930 	struct tog_log_view_state *s = &view->state.log;
2931 	int errcode;
2932 
2933 	err = stop_log_thread(s);
2934 
2935 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
2936 	if (errcode && err == NULL)
2937 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2938 
2939 	errcode = pthread_cond_destroy(&s->thread_args.commit_loaded);
2940 	if (errcode && err == NULL)
2941 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
2942 
2943 	free_commits(&s->limit_commits);
2944 	free_commits(&s->real_commits);
2945 	free(s->in_repo_path);
2946 	s->in_repo_path = NULL;
2947 	free(s->start_id);
2948 	s->start_id = NULL;
2949 	free(s->head_ref_name);
2950 	s->head_ref_name = NULL;
2951 	return err;
2952 }
2953 
2954 /*
2955  * We use two queues to implement the limit feature: first consists of
2956  * commits matching the current limit_regex; second is the real queue
2957  * of all known commits (real_commits). When the user starts limiting,
2958  * we swap queues such that all movement and displaying functionality
2959  * works with very slight change.
2960  */
2961 static const struct got_error *
2962 limit_log_view(struct tog_view *view)
2963 {
2964 	struct tog_log_view_state *s = &view->state.log;
2965 	struct commit_queue_entry *entry;
2966 	struct tog_view	*v = view;
2967 	const struct got_error *err = NULL;
2968 	char pattern[1024];
2969 	int ret;
2970 
2971 	if (view_is_hsplit_top(view))
2972 		v = view->child;
2973 	else if (view->mode == TOG_VIEW_SPLIT_VERT && view->parent)
2974 		v = view->parent;
2975 
2976 	/* Get the pattern */
2977 	wmove(v->window, v->nlines - 1, 0);
2978 	wclrtoeol(v->window);
2979 	mvwaddstr(v->window, v->nlines - 1, 0, "&/");
2980 	nodelay(v->window, FALSE);
2981 	nocbreak();
2982 	echo();
2983 	ret = wgetnstr(v->window, pattern, sizeof(pattern));
2984 	cbreak();
2985 	noecho();
2986 	nodelay(v->window, TRUE);
2987 	if (ret == ERR)
2988 		return NULL;
2989 
2990 	if (*pattern == '\0') {
2991 		/*
2992 		 * Safety measure for the situation where the user
2993 		 * resets limit without previously limiting anything.
2994 		 */
2995 		if (!s->limit_view)
2996 			return NULL;
2997 
2998 		/*
2999 		 * User could have pressed Ctrl+L, which refreshed the
3000 		 * commit queues, it means we can't save previously
3001 		 * (before limit took place) displayed entries,
3002 		 * because they would point to already free'ed memory,
3003 		 * so we are forced to always select first entry of
3004 		 * the queue.
3005 		 */
3006 		s->commits = &s->real_commits;
3007 		s->first_displayed_entry = TAILQ_FIRST(&s->real_commits.head);
3008 		s->selected_entry = s->first_displayed_entry;
3009 		s->selected = 0;
3010 		s->limit_view = 0;
3011 
3012 		return NULL;
3013 	}
3014 
3015 	if (regcomp(&s->limit_regex, pattern, REG_EXTENDED | REG_NEWLINE))
3016 		return NULL;
3017 
3018 	s->limit_view = 1;
3019 
3020 	/* Clear the screen while loading limit view */
3021 	s->first_displayed_entry = NULL;
3022 	s->last_displayed_entry = NULL;
3023 	s->selected_entry = NULL;
3024 	s->commits = &s->limit_commits;
3025 
3026 	/* Prepare limit queue for new search */
3027 	free_commits(&s->limit_commits);
3028 	s->limit_commits.ncommits = 0;
3029 
3030 	/* First process commits, which are in queue already */
3031 	TAILQ_FOREACH(entry, &s->real_commits.head, entry) {
3032 		int have_match = 0;
3033 
3034 		err = match_commit(&have_match, entry->id,
3035 		    entry->commit, &s->limit_regex);
3036 		if (err)
3037 			return err;
3038 
3039 		if (have_match) {
3040 			struct commit_queue_entry *matched;
3041 
3042 			matched = alloc_commit_queue_entry(entry->commit,
3043 			    entry->id);
3044 			if (matched == NULL) {
3045 				err = got_error_from_errno(
3046 				    "alloc_commit_queue_entry");
3047 				break;
3048 			}
3049 
3050 			err = got_object_commit_dup(&matched->commit,
3051 			    entry->commit);
3052 			if (err) {
3053 				free(matched);
3054 				return err;
3055 			}
3056 
3057 			matched->idx = s->limit_commits.ncommits;
3058 			TAILQ_INSERT_TAIL(&s->limit_commits.head,
3059 			    matched, entry);
3060 			s->limit_commits.ncommits++;
3061 		}
3062 	}
3063 
3064 	/* Second process all the commits, until we fill the screen */
3065 	if (s->limit_commits.ncommits < view->nlines - 1 &&
3066 	    !s->thread_args.log_complete) {
3067 		s->thread_args.commits_needed +=
3068 		    view->nlines - s->limit_commits.ncommits - 1;
3069 		err = trigger_log_thread(view, 1);
3070 		if (err)
3071 			return err;
3072 	}
3073 
3074 	s->first_displayed_entry = TAILQ_FIRST(&s->commits->head);
3075 	s->selected_entry = TAILQ_FIRST(&s->commits->head);
3076 	s->selected = 0;
3077 
3078 	return NULL;
3079 }
3080 
3081 static const struct got_error *
3082 search_start_log_view(struct tog_view *view)
3083 {
3084 	struct tog_log_view_state *s = &view->state.log;
3085 
3086 	s->matched_entry = NULL;
3087 	s->search_entry = NULL;
3088 	return NULL;
3089 }
3090 
3091 static const struct got_error *
3092 search_next_log_view(struct tog_view *view)
3093 {
3094 	const struct got_error *err = NULL;
3095 	struct tog_log_view_state *s = &view->state.log;
3096 	struct commit_queue_entry *entry;
3097 
3098 	/* Display progress update in log view. */
3099 	show_log_view(view);
3100 	update_panels();
3101 	doupdate();
3102 
3103 	if (s->search_entry) {
3104 		int errcode, ch;
3105 		errcode = pthread_mutex_unlock(&tog_mutex);
3106 		if (errcode)
3107 			return got_error_set_errno(errcode,
3108 			    "pthread_mutex_unlock");
3109 		ch = wgetch(view->window);
3110 		errcode = pthread_mutex_lock(&tog_mutex);
3111 		if (errcode)
3112 			return got_error_set_errno(errcode,
3113 			    "pthread_mutex_lock");
3114 		if (ch == CTRL('g') || ch == KEY_BACKSPACE) {
3115 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3116 			return NULL;
3117 		}
3118 		if (view->searching == TOG_SEARCH_FORWARD)
3119 			entry = TAILQ_NEXT(s->search_entry, entry);
3120 		else
3121 			entry = TAILQ_PREV(s->search_entry,
3122 			    commit_queue_head, entry);
3123 	} else if (s->matched_entry) {
3124 		int matched_idx = s->matched_entry->idx;
3125 		int selected_idx = s->selected_entry->idx;
3126 
3127 		/*
3128 		 * If the user has moved the cursor after we hit a match,
3129 		 * the position from where we should continue searching
3130 		 * might have changed.
3131 		 */
3132 		if (view->searching == TOG_SEARCH_FORWARD) {
3133 			if (matched_idx > selected_idx)
3134 				entry = TAILQ_NEXT(s->selected_entry, entry);
3135 			else
3136 				entry = TAILQ_NEXT(s->matched_entry, entry);
3137 		} else {
3138 			if (matched_idx < selected_idx)
3139 				entry = TAILQ_PREV(s->selected_entry,
3140 						commit_queue_head, entry);
3141 			else
3142 				entry = TAILQ_PREV(s->matched_entry,
3143 						commit_queue_head, entry);
3144 		}
3145 	} else {
3146 		entry = s->selected_entry;
3147 	}
3148 
3149 	while (1) {
3150 		int have_match = 0;
3151 
3152 		if (entry == NULL) {
3153 			if (s->thread_args.log_complete ||
3154 			    view->searching == TOG_SEARCH_BACKWARD) {
3155 				view->search_next_done =
3156 				    (s->matched_entry == NULL ?
3157 				    TOG_SEARCH_HAVE_NONE : TOG_SEARCH_NO_MORE);
3158 				s->search_entry = NULL;
3159 				return NULL;
3160 			}
3161 			/*
3162 			 * Poke the log thread for more commits and return,
3163 			 * allowing the main loop to make progress. Search
3164 			 * will resume at s->search_entry once we come back.
3165 			 */
3166 			s->thread_args.commits_needed++;
3167 			return trigger_log_thread(view, 0);
3168 		}
3169 
3170 		err = match_commit(&have_match, entry->id, entry->commit,
3171 		    &view->regex);
3172 		if (err)
3173 			break;
3174 		if (have_match) {
3175 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
3176 			s->matched_entry = entry;
3177 			break;
3178 		}
3179 
3180 		s->search_entry = entry;
3181 		if (view->searching == TOG_SEARCH_FORWARD)
3182 			entry = TAILQ_NEXT(entry, entry);
3183 		else
3184 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3185 	}
3186 
3187 	if (s->matched_entry) {
3188 		int cur = s->selected_entry->idx;
3189 		while (cur < s->matched_entry->idx) {
3190 			err = input_log_view(NULL, view, KEY_DOWN);
3191 			if (err)
3192 				return err;
3193 			cur++;
3194 		}
3195 		while (cur > s->matched_entry->idx) {
3196 			err = input_log_view(NULL, view, KEY_UP);
3197 			if (err)
3198 				return err;
3199 			cur--;
3200 		}
3201 	}
3202 
3203 	s->search_entry = NULL;
3204 
3205 	return NULL;
3206 }
3207 
3208 static const struct got_error *
3209 open_log_view(struct tog_view *view, struct got_object_id *start_id,
3210     struct got_repository *repo, const char *head_ref_name,
3211     const char *in_repo_path, int log_branches)
3212 {
3213 	const struct got_error *err = NULL;
3214 	struct tog_log_view_state *s = &view->state.log;
3215 	struct got_repository *thread_repo = NULL;
3216 	struct got_commit_graph *thread_graph = NULL;
3217 	int errcode;
3218 
3219 	if (in_repo_path != s->in_repo_path) {
3220 		free(s->in_repo_path);
3221 		s->in_repo_path = strdup(in_repo_path);
3222 		if (s->in_repo_path == NULL)
3223 			return got_error_from_errno("strdup");
3224 	}
3225 
3226 	/* The commit queue only contains commits being displayed. */
3227 	TAILQ_INIT(&s->real_commits.head);
3228 	s->real_commits.ncommits = 0;
3229 	s->commits = &s->real_commits;
3230 
3231 	TAILQ_INIT(&s->limit_commits.head);
3232 	s->limit_view = 0;
3233 	s->limit_commits.ncommits = 0;
3234 
3235 	s->repo = repo;
3236 	if (head_ref_name) {
3237 		s->head_ref_name = strdup(head_ref_name);
3238 		if (s->head_ref_name == NULL) {
3239 			err = got_error_from_errno("strdup");
3240 			goto done;
3241 		}
3242 	}
3243 	s->start_id = got_object_id_dup(start_id);
3244 	if (s->start_id == NULL) {
3245 		err = got_error_from_errno("got_object_id_dup");
3246 		goto done;
3247 	}
3248 	s->log_branches = log_branches;
3249 
3250 	STAILQ_INIT(&s->colors);
3251 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
3252 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
3253 		    get_color_value("TOG_COLOR_COMMIT"));
3254 		if (err)
3255 			goto done;
3256 		err = add_color(&s->colors, "^$", TOG_COLOR_AUTHOR,
3257 		    get_color_value("TOG_COLOR_AUTHOR"));
3258 		if (err) {
3259 			free_colors(&s->colors);
3260 			goto done;
3261 		}
3262 		err = add_color(&s->colors, "^$", TOG_COLOR_DATE,
3263 		    get_color_value("TOG_COLOR_DATE"));
3264 		if (err) {
3265 			free_colors(&s->colors);
3266 			goto done;
3267 		}
3268 	}
3269 
3270 	view->show = show_log_view;
3271 	view->input = input_log_view;
3272 	view->resize = resize_log_view;
3273 	view->close = close_log_view;
3274 	view->search_start = search_start_log_view;
3275 	view->search_next = search_next_log_view;
3276 
3277 	if (s->thread_args.pack_fds == NULL) {
3278 		err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3279 		if (err)
3280 			goto done;
3281 	}
3282 	err = got_repo_open(&thread_repo, got_repo_get_path(repo), NULL,
3283 	    s->thread_args.pack_fds);
3284 	if (err)
3285 		goto done;
3286 	err = got_commit_graph_open(&thread_graph, s->in_repo_path,
3287 	    !s->log_branches);
3288 	if (err)
3289 		goto done;
3290 	err = got_commit_graph_iter_start(thread_graph, s->start_id,
3291 	    s->repo, NULL, NULL);
3292 	if (err)
3293 		goto done;
3294 
3295 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
3296 	if (errcode) {
3297 		err = got_error_set_errno(errcode, "pthread_cond_init");
3298 		goto done;
3299 	}
3300 	errcode = pthread_cond_init(&s->thread_args.commit_loaded, NULL);
3301 	if (errcode) {
3302 		err = got_error_set_errno(errcode, "pthread_cond_init");
3303 		goto done;
3304 	}
3305 
3306 	s->thread_args.commits_needed = view->nlines;
3307 	s->thread_args.graph = thread_graph;
3308 	s->thread_args.real_commits = &s->real_commits;
3309 	s->thread_args.limit_commits = &s->limit_commits;
3310 	s->thread_args.in_repo_path = s->in_repo_path;
3311 	s->thread_args.start_id = s->start_id;
3312 	s->thread_args.repo = thread_repo;
3313 	s->thread_args.log_complete = 0;
3314 	s->thread_args.quit = &s->quit;
3315 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
3316 	s->thread_args.selected_entry = &s->selected_entry;
3317 	s->thread_args.searching = &view->searching;
3318 	s->thread_args.search_next_done = &view->search_next_done;
3319 	s->thread_args.regex = &view->regex;
3320 	s->thread_args.limiting = &s->limit_view;
3321 	s->thread_args.limit_regex = &s->limit_regex;
3322 	s->thread_args.limit_commits = &s->limit_commits;
3323 done:
3324 	if (err)
3325 		close_log_view(view);
3326 	return err;
3327 }
3328 
3329 static const struct got_error *
3330 show_log_view(struct tog_view *view)
3331 {
3332 	const struct got_error *err;
3333 	struct tog_log_view_state *s = &view->state.log;
3334 
3335 	if (s->thread == 0) { //NULL) {
3336 		int errcode = pthread_create(&s->thread, NULL, log_thread,
3337 		    &s->thread_args);
3338 		if (errcode)
3339 			return got_error_set_errno(errcode, "pthread_create");
3340 		if (s->thread_args.commits_needed > 0) {
3341 			err = trigger_log_thread(view, 1);
3342 			if (err)
3343 				return err;
3344 		}
3345 	}
3346 
3347 	return draw_commits(view);
3348 }
3349 
3350 static void
3351 log_move_cursor_up(struct tog_view *view, int page, int home)
3352 {
3353 	struct tog_log_view_state *s = &view->state.log;
3354 
3355 	if (s->first_displayed_entry == NULL)
3356 		return;
3357 	if (s->selected_entry->idx == 0)
3358 		view->count = 0;
3359 
3360 	if ((page && TAILQ_FIRST(&s->commits->head) == s->first_displayed_entry)
3361 	    || home)
3362 		s->selected = home ? 0 : MAX(0, s->selected - page - 1);
3363 
3364 	if (!page && !home && s->selected > 0)
3365 		--s->selected;
3366 	else
3367 		log_scroll_up(s, home ? s->commits->ncommits : MAX(page, 1));
3368 
3369 	select_commit(s);
3370 	return;
3371 }
3372 
3373 static const struct got_error *
3374 log_move_cursor_down(struct tog_view *view, int page)
3375 {
3376 	struct tog_log_view_state	*s = &view->state.log;
3377 	const struct got_error		*err = NULL;
3378 	int				 eos = view->nlines - 2;
3379 
3380 	if (s->first_displayed_entry == NULL)
3381 		return NULL;
3382 
3383 	if (s->thread_args.log_complete &&
3384 	    s->selected_entry->idx >= s->commits->ncommits - 1)
3385 		return NULL;
3386 
3387 	if (view_is_hsplit_top(view))
3388 		--eos;  /* border consumes the last line */
3389 
3390 	if (!page) {
3391 		if (s->selected < MIN(eos, s->commits->ncommits - 1))
3392 			++s->selected;
3393 		else
3394 			err = log_scroll_down(view, 1);
3395 	} else if (s->thread_args.load_all && s->thread_args.log_complete) {
3396 		struct commit_queue_entry *entry;
3397 		int n;
3398 
3399 		s->selected = 0;
3400 		entry = TAILQ_LAST(&s->commits->head, commit_queue_head);
3401 		s->last_displayed_entry = entry;
3402 		for (n = 0; n <= eos; n++) {
3403 			if (entry == NULL)
3404 				break;
3405 			s->first_displayed_entry = entry;
3406 			entry = TAILQ_PREV(entry, commit_queue_head, entry);
3407 		}
3408 		if (n > 0)
3409 			s->selected = n - 1;
3410 	} else {
3411 		if (s->last_displayed_entry->idx == s->commits->ncommits - 1 &&
3412 		    s->thread_args.log_complete)
3413 			s->selected += MIN(page,
3414 			    s->commits->ncommits - s->selected_entry->idx - 1);
3415 		else
3416 			err = log_scroll_down(view, page);
3417 	}
3418 	if (err)
3419 		return err;
3420 
3421 	/*
3422 	 * We might necessarily overshoot in horizontal
3423 	 * splits; if so, select the last displayed commit.
3424 	 */
3425 	if (s->first_displayed_entry && s->last_displayed_entry) {
3426 		s->selected = MIN(s->selected,
3427 		    s->last_displayed_entry->idx -
3428 		    s->first_displayed_entry->idx);
3429 	}
3430 
3431 	select_commit(s);
3432 
3433 	if (s->thread_args.log_complete &&
3434 	    s->selected_entry->idx == s->commits->ncommits - 1)
3435 		view->count = 0;
3436 
3437 	return NULL;
3438 }
3439 
3440 static void
3441 view_get_split(struct tog_view *view, int *y, int *x)
3442 {
3443 	*x = 0;
3444 	*y = 0;
3445 
3446 	if (view->mode == TOG_VIEW_SPLIT_HRZN) {
3447 		if (view->child && view->child->resized_y)
3448 			*y = view->child->resized_y;
3449 		else if (view->resized_y)
3450 			*y = view->resized_y;
3451 		else
3452 			*y = view_split_begin_y(view->lines);
3453 	} else if (view->mode == TOG_VIEW_SPLIT_VERT) {
3454 		if (view->child && view->child->resized_x)
3455 			*x = view->child->resized_x;
3456 		else if (view->resized_x)
3457 			*x = view->resized_x;
3458 		else
3459 			*x = view_split_begin_x(view->begin_x);
3460 	}
3461 }
3462 
3463 /* Split view horizontally at y and offset view->state->selected line. */
3464 static const struct got_error *
3465 view_init_hsplit(struct tog_view *view, int y)
3466 {
3467 	const struct got_error *err = NULL;
3468 
3469 	view->nlines = y;
3470 	view->ncols = COLS;
3471 	err = view_resize(view);
3472 	if (err)
3473 		return err;
3474 
3475 	err = offset_selection_down(view);
3476 
3477 	return err;
3478 }
3479 
3480 static const struct got_error *
3481 log_goto_line(struct tog_view *view, int nlines)
3482 {
3483 	const struct got_error		*err = NULL;
3484 	struct tog_log_view_state	*s = &view->state.log;
3485 	int				 g, idx = s->selected_entry->idx;
3486 
3487 	if (s->first_displayed_entry == NULL || s->last_displayed_entry == NULL)
3488 		return NULL;
3489 
3490 	g = view->gline;
3491 	view->gline = 0;
3492 
3493 	if (g >= s->first_displayed_entry->idx + 1 &&
3494 	    g <= s->last_displayed_entry->idx + 1 &&
3495 	    g - s->first_displayed_entry->idx - 1 < nlines) {
3496 		s->selected = g - s->first_displayed_entry->idx - 1;
3497 		select_commit(s);
3498 		return NULL;
3499 	}
3500 
3501 	if (idx + 1 < g) {
3502 		err = log_move_cursor_down(view, g - idx - 1);
3503 		if (!err && g > s->selected_entry->idx + 1)
3504 			err = log_move_cursor_down(view,
3505 			    g - s->first_displayed_entry->idx - 1);
3506 		if (err)
3507 			return err;
3508 	} else if (idx + 1 > g)
3509 		log_move_cursor_up(view, idx - g + 1, 0);
3510 
3511 	if (g < nlines && s->first_displayed_entry->idx == 0)
3512 		s->selected = g - 1;
3513 
3514 	select_commit(s);
3515 	return NULL;
3516 
3517 }
3518 
3519 static const struct got_error *
3520 input_log_view(struct tog_view **new_view, struct tog_view *view, int ch)
3521 {
3522 	const struct got_error *err = NULL;
3523 	struct tog_log_view_state *s = &view->state.log;
3524 	int eos, nscroll;
3525 
3526 	if (s->thread_args.load_all) {
3527 		if (ch == CTRL('g') || ch == KEY_BACKSPACE)
3528 			s->thread_args.load_all = 0;
3529 		else if (s->thread_args.log_complete) {
3530 			err = log_move_cursor_down(view, s->commits->ncommits);
3531 			s->thread_args.load_all = 0;
3532 		}
3533 		if (err)
3534 			return err;
3535 	}
3536 
3537 	eos = nscroll = view->nlines - 1;
3538 	if (view_is_hsplit_top(view))
3539 		--eos;  /* border */
3540 
3541 	if (view->gline)
3542 		return log_goto_line(view, eos);
3543 
3544 	switch (ch) {
3545 	case '&':
3546 		err = limit_log_view(view);
3547 		break;
3548 	case 'q':
3549 		s->quit = 1;
3550 		break;
3551 	case '0':
3552 		view->x = 0;
3553 		break;
3554 	case '$':
3555 		view->x = MAX(view->maxx - view->ncols / 2, 0);
3556 		view->count = 0;
3557 		break;
3558 	case KEY_RIGHT:
3559 	case 'l':
3560 		if (view->x + view->ncols / 2 < view->maxx)
3561 			view->x += 2;  /* move two columns right */
3562 		else
3563 			view->count = 0;
3564 		break;
3565 	case KEY_LEFT:
3566 	case 'h':
3567 		view->x -= MIN(view->x, 2);  /* move two columns back */
3568 		if (view->x <= 0)
3569 			view->count = 0;
3570 		break;
3571 	case 'k':
3572 	case KEY_UP:
3573 	case '<':
3574 	case ',':
3575 	case CTRL('p'):
3576 		log_move_cursor_up(view, 0, 0);
3577 		break;
3578 	case 'g':
3579 	case KEY_HOME:
3580 		log_move_cursor_up(view, 0, 1);
3581 		view->count = 0;
3582 		break;
3583 	case CTRL('u'):
3584 	case 'u':
3585 		nscroll /= 2;
3586 		/* FALL THROUGH */
3587 	case KEY_PPAGE:
3588 	case CTRL('b'):
3589 	case 'b':
3590 		log_move_cursor_up(view, nscroll, 0);
3591 		break;
3592 	case 'j':
3593 	case KEY_DOWN:
3594 	case '>':
3595 	case '.':
3596 	case CTRL('n'):
3597 		err = log_move_cursor_down(view, 0);
3598 		break;
3599 	case '@':
3600 		s->use_committer = !s->use_committer;
3601 		break;
3602 	case 'G':
3603 	case KEY_END: {
3604 		/* We don't know yet how many commits, so we're forced to
3605 		 * traverse them all. */
3606 		view->count = 0;
3607 		s->thread_args.load_all = 1;
3608 		if (!s->thread_args.log_complete)
3609 			return trigger_log_thread(view, 0);
3610 		err = log_move_cursor_down(view, s->commits->ncommits);
3611 		s->thread_args.load_all = 0;
3612 		break;
3613 	}
3614 	case CTRL('d'):
3615 	case 'd':
3616 		nscroll /= 2;
3617 		/* FALL THROUGH */
3618 	case KEY_NPAGE:
3619 	case CTRL('f'):
3620 	case 'f':
3621 	case ' ':
3622 		err = log_move_cursor_down(view, nscroll);
3623 		break;
3624 	case KEY_RESIZE:
3625 		if (s->selected > view->nlines - 2)
3626 			s->selected = view->nlines - 2;
3627 		if (s->selected > s->commits->ncommits - 1)
3628 			s->selected = s->commits->ncommits - 1;
3629 		select_commit(s);
3630 		if (s->commits->ncommits < view->nlines - 1 &&
3631 		    !s->thread_args.log_complete) {
3632 			s->thread_args.commits_needed += (view->nlines - 1) -
3633 			    s->commits->ncommits;
3634 			err = trigger_log_thread(view, 1);
3635 		}
3636 		break;
3637 	case KEY_ENTER:
3638 	case '\r':
3639 		view->count = 0;
3640 		if (s->selected_entry == NULL)
3641 			break;
3642 		err = view_request_new(new_view, view, TOG_VIEW_DIFF);
3643 		break;
3644 	case 'T':
3645 		view->count = 0;
3646 		if (s->selected_entry == NULL)
3647 			break;
3648 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
3649 		break;
3650 	case KEY_BACKSPACE:
3651 	case CTRL('l'):
3652 	case 'B':
3653 		view->count = 0;
3654 		if (ch == KEY_BACKSPACE &&
3655 		    got_path_is_root_dir(s->in_repo_path))
3656 			break;
3657 		err = stop_log_thread(s);
3658 		if (err)
3659 			return err;
3660 		if (ch == KEY_BACKSPACE) {
3661 			char *parent_path;
3662 			err = got_path_dirname(&parent_path, s->in_repo_path);
3663 			if (err)
3664 				return err;
3665 			free(s->in_repo_path);
3666 			s->in_repo_path = parent_path;
3667 			s->thread_args.in_repo_path = s->in_repo_path;
3668 		} else if (ch == CTRL('l')) {
3669 			struct got_object_id *start_id;
3670 			err = got_repo_match_object_id(&start_id, NULL,
3671 			    s->head_ref_name ? s->head_ref_name : GOT_REF_HEAD,
3672 			    GOT_OBJ_TYPE_COMMIT, &tog_refs, s->repo);
3673 			if (err)
3674 				return err;
3675 			free(s->start_id);
3676 			s->start_id = start_id;
3677 			s->thread_args.start_id = s->start_id;
3678 		} else /* 'B' */
3679 			s->log_branches = !s->log_branches;
3680 
3681 		if (s->thread_args.pack_fds == NULL) {
3682 			err = got_repo_pack_fds_open(&s->thread_args.pack_fds);
3683 			if (err)
3684 				return err;
3685 		}
3686 		err = got_repo_open(&s->thread_args.repo,
3687 		    got_repo_get_path(s->repo), NULL,
3688 		    s->thread_args.pack_fds);
3689 		if (err)
3690 			return err;
3691 		tog_free_refs();
3692 		err = tog_load_refs(s->repo, 0);
3693 		if (err)
3694 			return err;
3695 		err = got_commit_graph_open(&s->thread_args.graph,
3696 		    s->in_repo_path, !s->log_branches);
3697 		if (err)
3698 			return err;
3699 		err = got_commit_graph_iter_start(s->thread_args.graph,
3700 		    s->start_id, s->repo, NULL, NULL);
3701 		if (err)
3702 			return err;
3703 		free_commits(&s->real_commits);
3704 		free_commits(&s->limit_commits);
3705 		s->first_displayed_entry = NULL;
3706 		s->last_displayed_entry = NULL;
3707 		s->selected_entry = NULL;
3708 		s->selected = 0;
3709 		s->thread_args.log_complete = 0;
3710 		s->quit = 0;
3711 		s->thread_args.commits_needed = view->lines;
3712 		s->matched_entry = NULL;
3713 		s->search_entry = NULL;
3714 		view->offset = 0;
3715 		break;
3716 	case 'R':
3717 		view->count = 0;
3718 		err = view_request_new(new_view, view, TOG_VIEW_REF);
3719 		break;
3720 	default:
3721 		view->count = 0;
3722 		break;
3723 	}
3724 
3725 	return err;
3726 }
3727 
3728 static const struct got_error *
3729 apply_unveil(const char *repo_path, const char *worktree_path)
3730 {
3731 	const struct got_error *error;
3732 
3733 #ifdef PROFILE
3734 	if (unveil("gmon.out", "rwc") != 0)
3735 		return got_error_from_errno2("unveil", "gmon.out");
3736 #endif
3737 	if (repo_path && unveil(repo_path, "r") != 0)
3738 		return got_error_from_errno2("unveil", repo_path);
3739 
3740 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
3741 		return got_error_from_errno2("unveil", worktree_path);
3742 
3743 	if (unveil(GOT_TMPDIR_STR, "rwc") != 0)
3744 		return got_error_from_errno2("unveil", GOT_TMPDIR_STR);
3745 
3746 	error = got_privsep_unveil_exec_helpers();
3747 	if (error != NULL)
3748 		return error;
3749 
3750 	if (unveil(NULL, NULL) != 0)
3751 		return got_error_from_errno("unveil");
3752 
3753 	return NULL;
3754 }
3755 
3756 static void
3757 init_curses(void)
3758 {
3759 	/*
3760 	 * Override default signal handlers before starting ncurses.
3761 	 * This should prevent ncurses from installing its own
3762 	 * broken cleanup() signal handler.
3763 	 */
3764 	signal(SIGWINCH, tog_sigwinch);
3765 	signal(SIGPIPE, tog_sigpipe);
3766 	signal(SIGCONT, tog_sigcont);
3767 	signal(SIGINT, tog_sigint);
3768 	signal(SIGTERM, tog_sigterm);
3769 
3770 	initscr();
3771 	cbreak();
3772 	halfdelay(1); /* Do fast refresh while initial view is loading. */
3773 	noecho();
3774 	nonl();
3775 	intrflush(stdscr, FALSE);
3776 	keypad(stdscr, TRUE);
3777 	curs_set(0);
3778 	if (getenv("TOG_COLORS") != NULL) {
3779 		start_color();
3780 		use_default_colors();
3781 	}
3782 }
3783 
3784 static const struct got_error *
3785 get_in_repo_path_from_argv0(char **in_repo_path, int argc, char *argv[],
3786     struct got_repository *repo, struct got_worktree *worktree)
3787 {
3788 	const struct got_error *err = NULL;
3789 
3790 	if (argc == 0) {
3791 		*in_repo_path = strdup("/");
3792 		if (*in_repo_path == NULL)
3793 			return got_error_from_errno("strdup");
3794 		return NULL;
3795 	}
3796 
3797 	if (worktree) {
3798 		const char *prefix = got_worktree_get_path_prefix(worktree);
3799 		char *p;
3800 
3801 		err = got_worktree_resolve_path(&p, worktree, argv[0]);
3802 		if (err)
3803 			return err;
3804 		if (asprintf(in_repo_path, "%s%s%s", prefix,
3805 		    (p[0] != '\0' && !got_path_is_root_dir(prefix)) ? "/" : "",
3806 		    p) == -1) {
3807 			err = got_error_from_errno("asprintf");
3808 			*in_repo_path = NULL;
3809 		}
3810 		free(p);
3811 	} else
3812 		err = got_repo_map_path(in_repo_path, repo, argv[0]);
3813 
3814 	return err;
3815 }
3816 
3817 static const struct got_error *
3818 cmd_log(int argc, char *argv[])
3819 {
3820 	const struct got_error *error;
3821 	struct got_repository *repo = NULL;
3822 	struct got_worktree *worktree = NULL;
3823 	struct got_object_id *start_id = NULL;
3824 	char *in_repo_path = NULL, *repo_path = NULL, *cwd = NULL;
3825 	char *start_commit = NULL, *label = NULL;
3826 	struct got_reference *ref = NULL;
3827 	const char *head_ref_name = NULL;
3828 	int ch, log_branches = 0;
3829 	struct tog_view *view;
3830 	int *pack_fds = NULL;
3831 
3832 	while ((ch = getopt(argc, argv, "bc:r:")) != -1) {
3833 		switch (ch) {
3834 		case 'b':
3835 			log_branches = 1;
3836 			break;
3837 		case 'c':
3838 			start_commit = optarg;
3839 			break;
3840 		case 'r':
3841 			repo_path = realpath(optarg, NULL);
3842 			if (repo_path == NULL)
3843 				return got_error_from_errno2("realpath",
3844 				    optarg);
3845 			break;
3846 		default:
3847 			usage_log();
3848 			/* NOTREACHED */
3849 		}
3850 	}
3851 
3852 	argc -= optind;
3853 	argv += optind;
3854 
3855 	if (argc > 1)
3856 		usage_log();
3857 
3858 	error = got_repo_pack_fds_open(&pack_fds);
3859 	if (error != NULL)
3860 		goto done;
3861 
3862 	if (repo_path == NULL) {
3863 		cwd = getcwd(NULL, 0);
3864 		if (cwd == NULL)
3865 			return got_error_from_errno("getcwd");
3866 		error = got_worktree_open(&worktree, cwd);
3867 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3868 			goto done;
3869 		if (worktree)
3870 			repo_path =
3871 			    strdup(got_worktree_get_repo_path(worktree));
3872 		else
3873 			repo_path = strdup(cwd);
3874 		if (repo_path == NULL) {
3875 			error = got_error_from_errno("strdup");
3876 			goto done;
3877 		}
3878 	}
3879 
3880 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
3881 	if (error != NULL)
3882 		goto done;
3883 
3884 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
3885 	    repo, worktree);
3886 	if (error)
3887 		goto done;
3888 
3889 	init_curses();
3890 
3891 	error = apply_unveil(got_repo_get_path(repo),
3892 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
3893 	if (error)
3894 		goto done;
3895 
3896 	/* already loaded by tog_log_with_path()? */
3897 	if (TAILQ_EMPTY(&tog_refs)) {
3898 		error = tog_load_refs(repo, 0);
3899 		if (error)
3900 			goto done;
3901 	}
3902 
3903 	if (start_commit == NULL) {
3904 		error = got_repo_match_object_id(&start_id, &label,
3905 		    worktree ? got_worktree_get_head_ref_name(worktree) :
3906 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3907 		if (error)
3908 			goto done;
3909 		head_ref_name = label;
3910 	} else {
3911 		error = got_ref_open(&ref, repo, start_commit, 0);
3912 		if (error == NULL)
3913 			head_ref_name = got_ref_get_name(ref);
3914 		else if (error->code != GOT_ERR_NOT_REF)
3915 			goto done;
3916 		error = got_repo_match_object_id(&start_id, NULL,
3917 		    start_commit, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
3918 		if (error)
3919 			goto done;
3920 	}
3921 
3922 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
3923 	if (view == NULL) {
3924 		error = got_error_from_errno("view_open");
3925 		goto done;
3926 	}
3927 	error = open_log_view(view, start_id, repo, head_ref_name,
3928 	    in_repo_path, log_branches);
3929 	if (error)
3930 		goto done;
3931 	if (worktree) {
3932 		/* Release work tree lock. */
3933 		got_worktree_close(worktree);
3934 		worktree = NULL;
3935 	}
3936 	error = view_loop(view);
3937 done:
3938 	free(in_repo_path);
3939 	free(repo_path);
3940 	free(cwd);
3941 	free(start_id);
3942 	free(label);
3943 	if (ref)
3944 		got_ref_close(ref);
3945 	if (repo) {
3946 		const struct got_error *close_err = got_repo_close(repo);
3947 		if (error == NULL)
3948 			error = close_err;
3949 	}
3950 	if (worktree)
3951 		got_worktree_close(worktree);
3952 	if (pack_fds) {
3953 		const struct got_error *pack_err =
3954 		    got_repo_pack_fds_close(pack_fds);
3955 		if (error == NULL)
3956 			error = pack_err;
3957 	}
3958 	tog_free_refs();
3959 	return error;
3960 }
3961 
3962 __dead static void
3963 usage_diff(void)
3964 {
3965 	endwin();
3966 	fprintf(stderr, "usage: %s diff [-aw] [-C number] [-r repository-path] "
3967 	    "object1 object2\n", getprogname());
3968 	exit(1);
3969 }
3970 
3971 static int
3972 match_line(const char *line, regex_t *regex, size_t nmatch,
3973     regmatch_t *regmatch)
3974 {
3975 	return regexec(regex, line, nmatch, regmatch, 0) == 0;
3976 }
3977 
3978 static struct tog_color *
3979 match_color(struct tog_colors *colors, const char *line)
3980 {
3981 	struct tog_color *tc = NULL;
3982 
3983 	STAILQ_FOREACH(tc, colors, entry) {
3984 		if (match_line(line, &tc->regex, 0, NULL))
3985 			return tc;
3986 	}
3987 
3988 	return NULL;
3989 }
3990 
3991 static const struct got_error *
3992 add_matched_line(int *wtotal, const char *line, int wlimit, int col_tab_align,
3993     WINDOW *window, int skipcol, regmatch_t *regmatch)
3994 {
3995 	const struct got_error *err = NULL;
3996 	char *exstr = NULL;
3997 	wchar_t *wline = NULL;
3998 	int rme, rms, n, width, scrollx;
3999 	int width0 = 0, width1 = 0, width2 = 0;
4000 	char *seg0 = NULL, *seg1 = NULL, *seg2 = NULL;
4001 
4002 	*wtotal = 0;
4003 
4004 	rms = regmatch->rm_so;
4005 	rme = regmatch->rm_eo;
4006 
4007 	err = expand_tab(&exstr, line);
4008 	if (err)
4009 		return err;
4010 
4011 	/* Split the line into 3 segments, according to match offsets. */
4012 	seg0 = strndup(exstr, rms);
4013 	if (seg0 == NULL) {
4014 		err = got_error_from_errno("strndup");
4015 		goto done;
4016 	}
4017 	seg1 = strndup(exstr + rms, rme - rms);
4018 	if (seg1 == NULL) {
4019 		err = got_error_from_errno("strndup");
4020 		goto done;
4021 	}
4022 	seg2 = strdup(exstr + rme);
4023 	if (seg2 == NULL) {
4024 		err = got_error_from_errno("strndup");
4025 		goto done;
4026 	}
4027 
4028 	/* draw up to matched token if we haven't scrolled past it */
4029 	err = format_line(&wline, &width0, NULL, seg0, 0, wlimit,
4030 	    col_tab_align, 1);
4031 	if (err)
4032 		goto done;
4033 	n = MAX(width0 - skipcol, 0);
4034 	if (n) {
4035 		free(wline);
4036 		err = format_line(&wline, &width, &scrollx, seg0, skipcol,
4037 		    wlimit, col_tab_align, 1);
4038 		if (err)
4039 			goto done;
4040 		waddwstr(window, &wline[scrollx]);
4041 		wlimit -= width;
4042 		*wtotal += width;
4043 	}
4044 
4045 	if (wlimit > 0) {
4046 		int i = 0, w = 0;
4047 		size_t wlen;
4048 
4049 		free(wline);
4050 		err = format_line(&wline, &width1, NULL, seg1, 0, wlimit,
4051 		    col_tab_align, 1);
4052 		if (err)
4053 			goto done;
4054 		wlen = wcslen(wline);
4055 		while (i < wlen) {
4056 			width = wcwidth(wline[i]);
4057 			if (width == -1) {
4058 				/* should not happen, tabs are expanded */
4059 				err = got_error(GOT_ERR_RANGE);
4060 				goto done;
4061 			}
4062 			if (width0 + w + width > skipcol)
4063 				break;
4064 			w += width;
4065 			i++;
4066 		}
4067 		/* draw (visible part of) matched token (if scrolled into it) */
4068 		if (width1 - w > 0) {
4069 			wattron(window, A_STANDOUT);
4070 			waddwstr(window, &wline[i]);
4071 			wattroff(window, A_STANDOUT);
4072 			wlimit -= (width1 - w);
4073 			*wtotal += (width1 - w);
4074 		}
4075 	}
4076 
4077 	if (wlimit > 0) {  /* draw rest of line */
4078 		free(wline);
4079 		if (skipcol > width0 + width1) {
4080 			err = format_line(&wline, &width2, &scrollx, seg2,
4081 			    skipcol - (width0 + width1), wlimit,
4082 			    col_tab_align, 1);
4083 			if (err)
4084 				goto done;
4085 			waddwstr(window, &wline[scrollx]);
4086 		} else {
4087 			err = format_line(&wline, &width2, NULL, seg2, 0,
4088 			    wlimit, col_tab_align, 1);
4089 			if (err)
4090 				goto done;
4091 			waddwstr(window, wline);
4092 		}
4093 		*wtotal += width2;
4094 	}
4095 done:
4096 	free(wline);
4097 	free(exstr);
4098 	free(seg0);
4099 	free(seg1);
4100 	free(seg2);
4101 	return err;
4102 }
4103 
4104 static int
4105 gotoline(struct tog_view *view, int *lineno, int *nprinted)
4106 {
4107 	FILE	*f = NULL;
4108 	int	*eof, *first, *selected;
4109 
4110 	if (view->type == TOG_VIEW_DIFF) {
4111 		struct tog_diff_view_state *s = &view->state.diff;
4112 
4113 		first = &s->first_displayed_line;
4114 		selected = first;
4115 		eof = &s->eof;
4116 		f = s->f;
4117 	} else if (view->type == TOG_VIEW_BLAME) {
4118 		struct tog_blame_view_state *s = &view->state.blame;
4119 
4120 		first = &s->first_displayed_line;
4121 		selected = &s->selected_line;
4122 		eof = &s->eof;
4123 		f = s->blame.f;
4124 	} else
4125 		return 0;
4126 
4127 	/* Center gline in the middle of the page like vi(1). */
4128 	if (*lineno < view->gline - (view->nlines - 3) / 2)
4129 		return 0;
4130 	if (*first != 1 && (*lineno > view->gline - (view->nlines - 3) / 2)) {
4131 		rewind(f);
4132 		*eof = 0;
4133 		*first = 1;
4134 		*lineno = 0;
4135 		*nprinted = 0;
4136 		return 0;
4137 	}
4138 
4139 	*selected = view->gline <= (view->nlines - 3) / 2 ?
4140 		view->gline : (view->nlines - 3) / 2 + 1;
4141 	view->gline = 0;
4142 
4143 	return 1;
4144 }
4145 
4146 static const struct got_error *
4147 draw_file(struct tog_view *view, const char *header)
4148 {
4149 	struct tog_diff_view_state *s = &view->state.diff;
4150 	regmatch_t *regmatch = &view->regmatch;
4151 	const struct got_error *err;
4152 	int nprinted = 0;
4153 	char *line;
4154 	size_t linesize = 0;
4155 	ssize_t linelen;
4156 	wchar_t *wline;
4157 	int width;
4158 	int max_lines = view->nlines;
4159 	int nlines = s->nlines;
4160 	off_t line_offset;
4161 
4162 	s->lineno = s->first_displayed_line - 1;
4163 	line_offset = s->lines[s->first_displayed_line - 1].offset;
4164 	if (fseeko(s->f, line_offset, SEEK_SET) == -1)
4165 		return got_error_from_errno("fseek");
4166 
4167 	werase(view->window);
4168 
4169 	if (view->gline > s->nlines - 1)
4170 		view->gline = s->nlines - 1;
4171 
4172 	if (header) {
4173 		int ln = view->gline ? view->gline <= (view->nlines - 3) / 2 ?
4174 		    1 : view->gline - (view->nlines - 3) / 2 :
4175 		    s->lineno + s->selected_line;
4176 
4177 		if (asprintf(&line, "[%d/%d] %s", ln, nlines, header) == -1)
4178 			return got_error_from_errno("asprintf");
4179 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
4180 		    0, 0);
4181 		free(line);
4182 		if (err)
4183 			return err;
4184 
4185 		if (view_needs_focus_indication(view))
4186 			wstandout(view->window);
4187 		waddwstr(view->window, wline);
4188 		free(wline);
4189 		wline = NULL;
4190 		while (width++ < view->ncols)
4191 			waddch(view->window, ' ');
4192 		if (view_needs_focus_indication(view))
4193 			wstandend(view->window);
4194 
4195 		if (max_lines <= 1)
4196 			return NULL;
4197 		max_lines--;
4198 	}
4199 
4200 	s->eof = 0;
4201 	view->maxx = 0;
4202 	line = NULL;
4203 	while (max_lines > 0 && nprinted < max_lines) {
4204 		enum got_diff_line_type linetype;
4205 		attr_t attr = 0;
4206 
4207 		linelen = getline(&line, &linesize, s->f);
4208 		if (linelen == -1) {
4209 			if (feof(s->f)) {
4210 				s->eof = 1;
4211 				break;
4212 			}
4213 			free(line);
4214 			return got_ferror(s->f, GOT_ERR_IO);
4215 		}
4216 
4217 		if (++s->lineno < s->first_displayed_line)
4218 			continue;
4219 		if (view->gline && !gotoline(view, &s->lineno, &nprinted))
4220 			continue;
4221 		if (s->lineno == view->hiline)
4222 			attr = A_STANDOUT;
4223 
4224 		/* Set view->maxx based on full line length. */
4225 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 0,
4226 		    view->x ? 1 : 0);
4227 		if (err) {
4228 			free(line);
4229 			return err;
4230 		}
4231 		view->maxx = MAX(view->maxx, width);
4232 		free(wline);
4233 		wline = NULL;
4234 
4235 		linetype = s->lines[s->lineno].type;
4236 		if (linetype > GOT_DIFF_LINE_LOGMSG &&
4237 		    linetype < GOT_DIFF_LINE_CONTEXT)
4238 			attr |= COLOR_PAIR(linetype);
4239 		if (attr)
4240 			wattron(view->window, attr);
4241 		if (s->first_displayed_line + nprinted == s->matched_line &&
4242 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
4243 			err = add_matched_line(&width, line, view->ncols, 0,
4244 			    view->window, view->x, regmatch);
4245 			if (err) {
4246 				free(line);
4247 				return err;
4248 			}
4249 		} else {
4250 			int skip;
4251 			err = format_line(&wline, &width, &skip, line,
4252 			    view->x, view->ncols, 0, view->x ? 1 : 0);
4253 			if (err) {
4254 				free(line);
4255 				return err;
4256 			}
4257 			waddwstr(view->window, &wline[skip]);
4258 			free(wline);
4259 			wline = NULL;
4260 		}
4261 		if (s->lineno == view->hiline) {
4262 			/* highlight full gline length */
4263 			while (width++ < view->ncols)
4264 				waddch(view->window, ' ');
4265 		} else {
4266 			if (width <= view->ncols - 1)
4267 				waddch(view->window, '\n');
4268 		}
4269 		if (attr)
4270 			wattroff(view->window, attr);
4271 		if (++nprinted == 1)
4272 			s->first_displayed_line = s->lineno;
4273 	}
4274 	free(line);
4275 	if (nprinted >= 1)
4276 		s->last_displayed_line = s->first_displayed_line +
4277 		    (nprinted - 1);
4278 	else
4279 		s->last_displayed_line = s->first_displayed_line;
4280 
4281 	view_border(view);
4282 
4283 	if (s->eof) {
4284 		while (nprinted < view->nlines) {
4285 			waddch(view->window, '\n');
4286 			nprinted++;
4287 		}
4288 
4289 		err = format_line(&wline, &width, NULL, TOG_EOF_STRING, 0,
4290 		    view->ncols, 0, 0);
4291 		if (err) {
4292 			return err;
4293 		}
4294 
4295 		wstandout(view->window);
4296 		waddwstr(view->window, wline);
4297 		free(wline);
4298 		wline = NULL;
4299 		wstandend(view->window);
4300 	}
4301 
4302 	return NULL;
4303 }
4304 
4305 static char *
4306 get_datestr(time_t *time, char *datebuf)
4307 {
4308 	struct tm mytm, *tm;
4309 	char *p, *s;
4310 
4311 	tm = gmtime_r(time, &mytm);
4312 	if (tm == NULL)
4313 		return NULL;
4314 	s = asctime_r(tm, datebuf);
4315 	if (s == NULL)
4316 		return NULL;
4317 	p = strchr(s, '\n');
4318 	if (p)
4319 		*p = '\0';
4320 	return s;
4321 }
4322 
4323 static const struct got_error *
4324 get_changed_paths(struct got_pathlist_head *paths,
4325     struct got_commit_object *commit, struct got_repository *repo)
4326 {
4327 	const struct got_error *err = NULL;
4328 	struct got_object_id *tree_id1 = NULL, *tree_id2 = NULL;
4329 	struct got_tree_object *tree1 = NULL, *tree2 = NULL;
4330 	struct got_object_qid *qid;
4331 
4332 	qid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
4333 	if (qid != NULL) {
4334 		struct got_commit_object *pcommit;
4335 		err = got_object_open_as_commit(&pcommit, repo,
4336 		    &qid->id);
4337 		if (err)
4338 			return err;
4339 
4340 		tree_id1 = got_object_id_dup(
4341 		    got_object_commit_get_tree_id(pcommit));
4342 		if (tree_id1 == NULL) {
4343 			got_object_commit_close(pcommit);
4344 			return got_error_from_errno("got_object_id_dup");
4345 		}
4346 		got_object_commit_close(pcommit);
4347 
4348 	}
4349 
4350 	if (tree_id1) {
4351 		err = got_object_open_as_tree(&tree1, repo, tree_id1);
4352 		if (err)
4353 			goto done;
4354 	}
4355 
4356 	tree_id2 = got_object_commit_get_tree_id(commit);
4357 	err = got_object_open_as_tree(&tree2, repo, tree_id2);
4358 	if (err)
4359 		goto done;
4360 
4361 	err = got_diff_tree(tree1, tree2, NULL, NULL, -1, -1, "", "", repo,
4362 	    got_diff_tree_collect_changed_paths, paths, 0);
4363 done:
4364 	if (tree1)
4365 		got_object_tree_close(tree1);
4366 	if (tree2)
4367 		got_object_tree_close(tree2);
4368 	free(tree_id1);
4369 	return err;
4370 }
4371 
4372 static const struct got_error *
4373 add_line_metadata(struct got_diff_line **lines, size_t *nlines,
4374     off_t off, uint8_t type)
4375 {
4376 	struct got_diff_line *p;
4377 
4378 	p = reallocarray(*lines, *nlines + 1, sizeof(**lines));
4379 	if (p == NULL)
4380 		return got_error_from_errno("reallocarray");
4381 	*lines = p;
4382 	(*lines)[*nlines].offset = off;
4383 	(*lines)[*nlines].type = type;
4384 	(*nlines)++;
4385 
4386 	return NULL;
4387 }
4388 
4389 static const struct got_error *
4390 write_commit_info(struct got_diff_line **lines, size_t *nlines,
4391     struct got_object_id *commit_id, struct got_reflist_head *refs,
4392     struct got_repository *repo, FILE *outfile)
4393 {
4394 	const struct got_error *err = NULL;
4395 	char datebuf[26], *datestr;
4396 	struct got_commit_object *commit;
4397 	char *id_str = NULL, *logmsg = NULL, *s = NULL, *line;
4398 	time_t committer_time;
4399 	const char *author, *committer;
4400 	char *refs_str = NULL;
4401 	struct got_pathlist_head changed_paths;
4402 	struct got_pathlist_entry *pe;
4403 	off_t outoff = 0;
4404 	int n;
4405 
4406 	TAILQ_INIT(&changed_paths);
4407 
4408 	if (refs) {
4409 		err = build_refs_str(&refs_str, refs, commit_id, repo);
4410 		if (err)
4411 			return err;
4412 	}
4413 
4414 	err = got_object_open_as_commit(&commit, repo, commit_id);
4415 	if (err)
4416 		return err;
4417 
4418 	err = got_object_id_str(&id_str, commit_id);
4419 	if (err) {
4420 		err = got_error_from_errno("got_object_id_str");
4421 		goto done;
4422 	}
4423 
4424 	err = add_line_metadata(lines, nlines, 0, GOT_DIFF_LINE_NONE);
4425 	if (err)
4426 		goto done;
4427 
4428 	n = fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
4429 	    refs_str ? refs_str : "", refs_str ? ")" : "");
4430 	if (n < 0) {
4431 		err = got_error_from_errno("fprintf");
4432 		goto done;
4433 	}
4434 	outoff += n;
4435 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_META);
4436 	if (err)
4437 		goto done;
4438 
4439 	n = fprintf(outfile, "from: %s\n",
4440 	    got_object_commit_get_author(commit));
4441 	if (n < 0) {
4442 		err = got_error_from_errno("fprintf");
4443 		goto done;
4444 	}
4445 	outoff += n;
4446 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_AUTHOR);
4447 	if (err)
4448 		goto done;
4449 
4450 	committer_time = got_object_commit_get_committer_time(commit);
4451 	datestr = get_datestr(&committer_time, datebuf);
4452 	if (datestr) {
4453 		n = fprintf(outfile, "date: %s UTC\n", datestr);
4454 		if (n < 0) {
4455 			err = got_error_from_errno("fprintf");
4456 			goto done;
4457 		}
4458 		outoff += n;
4459 		err = add_line_metadata(lines, nlines, outoff,
4460 		    GOT_DIFF_LINE_DATE);
4461 		if (err)
4462 			goto done;
4463 	}
4464 	author = got_object_commit_get_author(commit);
4465 	committer = got_object_commit_get_committer(commit);
4466 	if (strcmp(author, committer) != 0) {
4467 		n = fprintf(outfile, "via: %s\n", committer);
4468 		if (n < 0) {
4469 			err = got_error_from_errno("fprintf");
4470 			goto done;
4471 		}
4472 		outoff += n;
4473 		err = add_line_metadata(lines, nlines, outoff,
4474 		    GOT_DIFF_LINE_AUTHOR);
4475 		if (err)
4476 			goto done;
4477 	}
4478 	if (got_object_commit_get_nparents(commit) > 1) {
4479 		const struct got_object_id_queue *parent_ids;
4480 		struct got_object_qid *qid;
4481 		int pn = 1;
4482 		parent_ids = got_object_commit_get_parent_ids(commit);
4483 		STAILQ_FOREACH(qid, parent_ids, entry) {
4484 			err = got_object_id_str(&id_str, &qid->id);
4485 			if (err)
4486 				goto done;
4487 			n = fprintf(outfile, "parent %d: %s\n", pn++, id_str);
4488 			if (n < 0) {
4489 				err = got_error_from_errno("fprintf");
4490 				goto done;
4491 			}
4492 			outoff += n;
4493 			err = add_line_metadata(lines, nlines, outoff,
4494 			    GOT_DIFF_LINE_META);
4495 			if (err)
4496 				goto done;
4497 			free(id_str);
4498 			id_str = NULL;
4499 		}
4500 	}
4501 
4502 	err = got_object_commit_get_logmsg(&logmsg, commit);
4503 	if (err)
4504 		goto done;
4505 	s = logmsg;
4506 	while ((line = strsep(&s, "\n")) != NULL) {
4507 		n = fprintf(outfile, "%s\n", line);
4508 		if (n < 0) {
4509 			err = got_error_from_errno("fprintf");
4510 			goto done;
4511 		}
4512 		outoff += n;
4513 		err = add_line_metadata(lines, nlines, outoff,
4514 		    GOT_DIFF_LINE_LOGMSG);
4515 		if (err)
4516 			goto done;
4517 	}
4518 
4519 	err = get_changed_paths(&changed_paths, commit, repo);
4520 	if (err)
4521 		goto done;
4522 	TAILQ_FOREACH(pe, &changed_paths, entry) {
4523 		struct got_diff_changed_path *cp = pe->data;
4524 		n = fprintf(outfile, "%c  %s\n", cp->status, pe->path);
4525 		if (n < 0) {
4526 			err = got_error_from_errno("fprintf");
4527 			goto done;
4528 		}
4529 		outoff += n;
4530 		err = add_line_metadata(lines, nlines, outoff,
4531 		    GOT_DIFF_LINE_CHANGES);
4532 		if (err)
4533 			goto done;
4534 		free((char *)pe->path);
4535 		free(pe->data);
4536 	}
4537 
4538 	fputc('\n', outfile);
4539 	outoff++;
4540 	err = add_line_metadata(lines, nlines, outoff, GOT_DIFF_LINE_NONE);
4541 done:
4542 	got_pathlist_free(&changed_paths);
4543 	free(id_str);
4544 	free(logmsg);
4545 	free(refs_str);
4546 	got_object_commit_close(commit);
4547 	if (err) {
4548 		free(*lines);
4549 		*lines = NULL;
4550 		*nlines = 0;
4551 	}
4552 	return err;
4553 }
4554 
4555 static const struct got_error *
4556 create_diff(struct tog_diff_view_state *s)
4557 {
4558 	const struct got_error *err = NULL;
4559 	FILE *f = NULL;
4560 	int obj_type;
4561 
4562 	free(s->lines);
4563 	s->lines = malloc(sizeof(*s->lines));
4564 	if (s->lines == NULL)
4565 		return got_error_from_errno("malloc");
4566 	s->nlines = 0;
4567 
4568 	f = got_opentemp();
4569 	if (f == NULL) {
4570 		err = got_error_from_errno("got_opentemp");
4571 		goto done;
4572 	}
4573 	if (s->f && fclose(s->f) == EOF) {
4574 		err = got_error_from_errno("fclose");
4575 		goto done;
4576 	}
4577 	s->f = f;
4578 
4579 	if (s->id1)
4580 		err = got_object_get_type(&obj_type, s->repo, s->id1);
4581 	else
4582 		err = got_object_get_type(&obj_type, s->repo, s->id2);
4583 	if (err)
4584 		goto done;
4585 
4586 	switch (obj_type) {
4587 	case GOT_OBJ_TYPE_BLOB:
4588 		err = got_diff_objects_as_blobs(&s->lines, &s->nlines,
4589 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2,
4590 		    s->label1, s->label2, tog_diff_algo, s->diff_context,
4591 		    s->ignore_whitespace, s->force_text_diff, s->repo, s->f);
4592 		break;
4593 	case GOT_OBJ_TYPE_TREE:
4594 		err = got_diff_objects_as_trees(&s->lines, &s->nlines,
4595 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL, "", "",
4596 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4597 		    s->force_text_diff, s->repo, s->f);
4598 		break;
4599 	case GOT_OBJ_TYPE_COMMIT: {
4600 		const struct got_object_id_queue *parent_ids;
4601 		struct got_object_qid *pid;
4602 		struct got_commit_object *commit2;
4603 		struct got_reflist_head *refs;
4604 
4605 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
4606 		if (err)
4607 			goto done;
4608 		refs = got_reflist_object_id_map_lookup(tog_refs_idmap, s->id2);
4609 		/* Show commit info if we're diffing to a parent/root commit. */
4610 		if (s->id1 == NULL) {
4611 			err = write_commit_info(&s->lines, &s->nlines, s->id2,
4612 			    refs, s->repo, s->f);
4613 			if (err)
4614 				goto done;
4615 		} else {
4616 			parent_ids = got_object_commit_get_parent_ids(commit2);
4617 			STAILQ_FOREACH(pid, parent_ids, entry) {
4618 				if (got_object_id_cmp(s->id1, &pid->id) == 0) {
4619 					err = write_commit_info(&s->lines,
4620 					    &s->nlines, s->id2, refs, s->repo,
4621 					    s->f);
4622 					if (err)
4623 						goto done;
4624 					break;
4625 				}
4626 			}
4627 		}
4628 		got_object_commit_close(commit2);
4629 
4630 		err = got_diff_objects_as_commits(&s->lines, &s->nlines,
4631 		    s->f1, s->f2, s->fd1, s->fd2, s->id1, s->id2, NULL,
4632 		    tog_diff_algo, s->diff_context, s->ignore_whitespace,
4633 		    s->force_text_diff, s->repo, s->f);
4634 		break;
4635 	}
4636 	default:
4637 		err = got_error(GOT_ERR_OBJ_TYPE);
4638 		break;
4639 	}
4640 done:
4641 	if (s->f && fflush(s->f) != 0 && err == NULL)
4642 		err = got_error_from_errno("fflush");
4643 	return err;
4644 }
4645 
4646 static void
4647 diff_view_indicate_progress(struct tog_view *view)
4648 {
4649 	mvwaddstr(view->window, 0, 0, "diffing...");
4650 	update_panels();
4651 	doupdate();
4652 }
4653 
4654 static const struct got_error *
4655 search_start_diff_view(struct tog_view *view)
4656 {
4657 	struct tog_diff_view_state *s = &view->state.diff;
4658 
4659 	s->matched_line = 0;
4660 	return NULL;
4661 }
4662 
4663 static const struct got_error *
4664 search_next_diff_view(struct tog_view *view)
4665 {
4666 	struct tog_diff_view_state *s = &view->state.diff;
4667 	const struct got_error *err = NULL;
4668 	int lineno;
4669 	char *line = NULL;
4670 	size_t linesize = 0;
4671 	ssize_t linelen;
4672 
4673 	if (!view->searching) {
4674 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
4675 		return NULL;
4676 	}
4677 
4678 	if (s->matched_line) {
4679 		if (view->searching == TOG_SEARCH_FORWARD)
4680 			lineno = s->matched_line + 1;
4681 		else
4682 			lineno = s->matched_line - 1;
4683 	} else
4684 		lineno = s->first_displayed_line;
4685 
4686 	while (1) {
4687 		off_t offset;
4688 
4689 		if (lineno <= 0 || lineno > s->nlines) {
4690 			if (s->matched_line == 0) {
4691 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4692 				break;
4693 			}
4694 
4695 			if (view->searching == TOG_SEARCH_FORWARD)
4696 				lineno = 1;
4697 			else
4698 				lineno = s->nlines;
4699 		}
4700 
4701 		offset = s->lines[lineno - 1].offset;
4702 		if (fseeko(s->f, offset, SEEK_SET) != 0) {
4703 			free(line);
4704 			return got_error_from_errno("fseeko");
4705 		}
4706 		linelen = getline(&line, &linesize, s->f);
4707 		if (linelen != -1) {
4708 			char *exstr;
4709 			err = expand_tab(&exstr, line);
4710 			if (err)
4711 				break;
4712 			if (match_line(exstr, &view->regex, 1,
4713 			    &view->regmatch)) {
4714 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
4715 				s->matched_line = lineno;
4716 				free(exstr);
4717 				break;
4718 			}
4719 			free(exstr);
4720 		}
4721 		if (view->searching == TOG_SEARCH_FORWARD)
4722 			lineno++;
4723 		else
4724 			lineno--;
4725 	}
4726 	free(line);
4727 
4728 	if (s->matched_line) {
4729 		s->first_displayed_line = s->matched_line;
4730 		s->selected_line = 1;
4731 	}
4732 
4733 	return err;
4734 }
4735 
4736 static const struct got_error *
4737 close_diff_view(struct tog_view *view)
4738 {
4739 	const struct got_error *err = NULL;
4740 	struct tog_diff_view_state *s = &view->state.diff;
4741 
4742 	free(s->id1);
4743 	s->id1 = NULL;
4744 	free(s->id2);
4745 	s->id2 = NULL;
4746 	if (s->f && fclose(s->f) == EOF)
4747 		err = got_error_from_errno("fclose");
4748 	s->f = NULL;
4749 	if (s->f1 && fclose(s->f1) == EOF && err == NULL)
4750 		err = got_error_from_errno("fclose");
4751 	s->f1 = NULL;
4752 	if (s->f2 && fclose(s->f2) == EOF && err == NULL)
4753 		err = got_error_from_errno("fclose");
4754 	s->f2 = NULL;
4755 	if (s->fd1 != -1 && close(s->fd1) == -1 && err == NULL)
4756 		err = got_error_from_errno("close");
4757 	s->fd1 = -1;
4758 	if (s->fd2 != -1 && close(s->fd2) == -1 && err == NULL)
4759 		err = got_error_from_errno("close");
4760 	s->fd2 = -1;
4761 	free(s->lines);
4762 	s->lines = NULL;
4763 	s->nlines = 0;
4764 	return err;
4765 }
4766 
4767 static const struct got_error *
4768 open_diff_view(struct tog_view *view, struct got_object_id *id1,
4769     struct got_object_id *id2, const char *label1, const char *label2,
4770     int diff_context, int ignore_whitespace, int force_text_diff,
4771     struct tog_view *parent_view, struct got_repository *repo)
4772 {
4773 	const struct got_error *err;
4774 	struct tog_diff_view_state *s = &view->state.diff;
4775 
4776 	memset(s, 0, sizeof(*s));
4777 	s->fd1 = -1;
4778 	s->fd2 = -1;
4779 
4780 	if (id1 != NULL && id2 != NULL) {
4781 	    int type1, type2;
4782 	    err = got_object_get_type(&type1, repo, id1);
4783 	    if (err)
4784 		return err;
4785 	    err = got_object_get_type(&type2, repo, id2);
4786 	    if (err)
4787 		return err;
4788 
4789 	    if (type1 != type2)
4790 		return got_error(GOT_ERR_OBJ_TYPE);
4791 	}
4792 	s->first_displayed_line = 1;
4793 	s->last_displayed_line = view->nlines;
4794 	s->selected_line = 1;
4795 	s->repo = repo;
4796 	s->id1 = id1;
4797 	s->id2 = id2;
4798 	s->label1 = label1;
4799 	s->label2 = label2;
4800 
4801 	if (id1) {
4802 		s->id1 = got_object_id_dup(id1);
4803 		if (s->id1 == NULL)
4804 			return got_error_from_errno("got_object_id_dup");
4805 	} else
4806 		s->id1 = NULL;
4807 
4808 	s->id2 = got_object_id_dup(id2);
4809 	if (s->id2 == NULL) {
4810 		err = got_error_from_errno("got_object_id_dup");
4811 		goto done;
4812 	}
4813 
4814 	s->f1 = got_opentemp();
4815 	if (s->f1 == NULL) {
4816 		err = got_error_from_errno("got_opentemp");
4817 		goto done;
4818 	}
4819 
4820 	s->f2 = got_opentemp();
4821 	if (s->f2 == NULL) {
4822 		err = got_error_from_errno("got_opentemp");
4823 		goto done;
4824 	}
4825 
4826 	s->fd1 = got_opentempfd();
4827 	if (s->fd1 == -1) {
4828 		err = got_error_from_errno("got_opentempfd");
4829 		goto done;
4830 	}
4831 
4832 	s->fd2 = got_opentempfd();
4833 	if (s->fd2 == -1) {
4834 		err = got_error_from_errno("got_opentempfd");
4835 		goto done;
4836 	}
4837 
4838 	s->first_displayed_line = 1;
4839 	s->last_displayed_line = view->nlines;
4840 	s->diff_context = diff_context;
4841 	s->ignore_whitespace = ignore_whitespace;
4842 	s->force_text_diff = force_text_diff;
4843 	s->parent_view = parent_view;
4844 	s->repo = repo;
4845 
4846 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
4847 		int rc;
4848 
4849 		rc = init_pair(GOT_DIFF_LINE_MINUS,
4850 		    get_color_value("TOG_COLOR_DIFF_MINUS"), -1);
4851 		if (rc != ERR)
4852 			rc = init_pair(GOT_DIFF_LINE_PLUS,
4853 			    get_color_value("TOG_COLOR_DIFF_PLUS"), -1);
4854 		if (rc != ERR)
4855 			rc = init_pair(GOT_DIFF_LINE_HUNK,
4856 			    get_color_value("TOG_COLOR_DIFF_CHUNK_HEADER"), -1);
4857 		if (rc != ERR)
4858 			rc = init_pair(GOT_DIFF_LINE_META,
4859 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4860 		if (rc != ERR)
4861 			rc = init_pair(GOT_DIFF_LINE_CHANGES,
4862 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4863 		if (rc != ERR)
4864 			rc = init_pair(GOT_DIFF_LINE_BLOB_MIN,
4865 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4866 		if (rc != ERR)
4867 			rc = init_pair(GOT_DIFF_LINE_BLOB_PLUS,
4868 			    get_color_value("TOG_COLOR_DIFF_META"), -1);
4869 		if (rc != ERR)
4870 			rc = init_pair(GOT_DIFF_LINE_AUTHOR,
4871 			    get_color_value("TOG_COLOR_AUTHOR"), -1);
4872 		if (rc != ERR)
4873 			rc = init_pair(GOT_DIFF_LINE_DATE,
4874 			    get_color_value("TOG_COLOR_DATE"), -1);
4875 		if (rc == ERR) {
4876 			err = got_error(GOT_ERR_RANGE);
4877 			goto done;
4878 		}
4879 	}
4880 
4881 	if (parent_view && parent_view->type == TOG_VIEW_LOG &&
4882 	    view_is_splitscreen(view))
4883 		show_log_view(parent_view); /* draw border */
4884 	diff_view_indicate_progress(view);
4885 
4886 	err = create_diff(s);
4887 
4888 	view->show = show_diff_view;
4889 	view->input = input_diff_view;
4890 	view->reset = reset_diff_view;
4891 	view->close = close_diff_view;
4892 	view->search_start = search_start_diff_view;
4893 	view->search_next = search_next_diff_view;
4894 done:
4895 	if (err)
4896 		close_diff_view(view);
4897 	return err;
4898 }
4899 
4900 static const struct got_error *
4901 show_diff_view(struct tog_view *view)
4902 {
4903 	const struct got_error *err;
4904 	struct tog_diff_view_state *s = &view->state.diff;
4905 	char *id_str1 = NULL, *id_str2, *header;
4906 	const char *label1, *label2;
4907 
4908 	if (s->id1) {
4909 		err = got_object_id_str(&id_str1, s->id1);
4910 		if (err)
4911 			return err;
4912 		label1 = s->label1 ? s->label1 : id_str1;
4913 	} else
4914 		label1 = "/dev/null";
4915 
4916 	err = got_object_id_str(&id_str2, s->id2);
4917 	if (err)
4918 		return err;
4919 	label2 = s->label2 ? s->label2 : id_str2;
4920 
4921 	if (asprintf(&header, "diff %s %s", label1, label2) == -1) {
4922 		err = got_error_from_errno("asprintf");
4923 		free(id_str1);
4924 		free(id_str2);
4925 		return err;
4926 	}
4927 	free(id_str1);
4928 	free(id_str2);
4929 
4930 	err = draw_file(view, header);
4931 	free(header);
4932 	return err;
4933 }
4934 
4935 static const struct got_error *
4936 set_selected_commit(struct tog_diff_view_state *s,
4937     struct commit_queue_entry *entry)
4938 {
4939 	const struct got_error *err;
4940 	const struct got_object_id_queue *parent_ids;
4941 	struct got_commit_object *selected_commit;
4942 	struct got_object_qid *pid;
4943 
4944 	free(s->id2);
4945 	s->id2 = got_object_id_dup(entry->id);
4946 	if (s->id2 == NULL)
4947 		return got_error_from_errno("got_object_id_dup");
4948 
4949 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
4950 	if (err)
4951 		return err;
4952 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
4953 	free(s->id1);
4954 	pid = STAILQ_FIRST(parent_ids);
4955 	s->id1 = pid ? got_object_id_dup(&pid->id) : NULL;
4956 	got_object_commit_close(selected_commit);
4957 	return NULL;
4958 }
4959 
4960 static const struct got_error *
4961 reset_diff_view(struct tog_view *view)
4962 {
4963 	struct tog_diff_view_state *s = &view->state.diff;
4964 
4965 	view->count = 0;
4966 	wclear(view->window);
4967 	s->first_displayed_line = 1;
4968 	s->last_displayed_line = view->nlines;
4969 	s->matched_line = 0;
4970 	diff_view_indicate_progress(view);
4971 	return create_diff(s);
4972 }
4973 
4974 static void
4975 diff_prev_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4976 {
4977 	int start, i;
4978 
4979 	i = start = s->first_displayed_line - 1;
4980 
4981 	while (s->lines[i].type != type) {
4982 		if (i == 0)
4983 			i = s->nlines - 1;
4984 		if (--i == start)
4985 			return; /* do nothing, requested type not in file */
4986 	}
4987 
4988 	s->selected_line = 1;
4989 	s->first_displayed_line = i;
4990 }
4991 
4992 static void
4993 diff_next_index(struct tog_diff_view_state *s, enum got_diff_line_type type)
4994 {
4995 	int start, i;
4996 
4997 	i = start = s->first_displayed_line + 1;
4998 
4999 	while (s->lines[i].type != type) {
5000 		if (i == s->nlines - 1)
5001 			i = 0;
5002 		if (++i == start)
5003 			return; /* do nothing, requested type not in file */
5004 	}
5005 
5006 	s->selected_line = 1;
5007 	s->first_displayed_line = i;
5008 }
5009 
5010 static struct got_object_id *get_selected_commit_id(struct tog_blame_line *,
5011     int, int, int);
5012 static struct got_object_id *get_annotation_for_line(struct tog_blame_line *,
5013     int, int);
5014 
5015 static const struct got_error *
5016 input_diff_view(struct tog_view **new_view, struct tog_view *view, int ch)
5017 {
5018 	const struct got_error *err = NULL;
5019 	struct tog_diff_view_state *s = &view->state.diff;
5020 	struct tog_log_view_state *ls;
5021 	struct commit_queue_entry *old_selected_entry;
5022 	char *line = NULL;
5023 	size_t linesize = 0;
5024 	ssize_t linelen;
5025 	int i, nscroll = view->nlines - 1, up = 0;
5026 
5027 	s->lineno = s->first_displayed_line - 1 + s->selected_line;
5028 
5029 	switch (ch) {
5030 	case '0':
5031 		view->x = 0;
5032 		break;
5033 	case '$':
5034 		view->x = MAX(view->maxx - view->ncols / 3, 0);
5035 		view->count = 0;
5036 		break;
5037 	case KEY_RIGHT:
5038 	case 'l':
5039 		if (view->x + view->ncols / 3 < view->maxx)
5040 			view->x += 2;  /* move two columns right */
5041 		else
5042 			view->count = 0;
5043 		break;
5044 	case KEY_LEFT:
5045 	case 'h':
5046 		view->x -= MIN(view->x, 2);  /* move two columns back */
5047 		if (view->x <= 0)
5048 			view->count = 0;
5049 		break;
5050 	case 'a':
5051 	case 'w':
5052 		if (ch == 'a')
5053 			s->force_text_diff = !s->force_text_diff;
5054 		if (ch == 'w')
5055 			s->ignore_whitespace = !s->ignore_whitespace;
5056 		err = reset_diff_view(view);
5057 		break;
5058 	case 'g':
5059 	case KEY_HOME:
5060 		s->first_displayed_line = 1;
5061 		view->count = 0;
5062 		break;
5063 	case 'G':
5064 	case KEY_END:
5065 		view->count = 0;
5066 		if (s->eof)
5067 			break;
5068 
5069 		s->first_displayed_line = (s->nlines - view->nlines) + 2;
5070 		s->eof = 1;
5071 		break;
5072 	case 'k':
5073 	case KEY_UP:
5074 	case CTRL('p'):
5075 		if (s->first_displayed_line > 1)
5076 			s->first_displayed_line--;
5077 		else
5078 			view->count = 0;
5079 		break;
5080 	case CTRL('u'):
5081 	case 'u':
5082 		nscroll /= 2;
5083 		/* FALL THROUGH */
5084 	case KEY_PPAGE:
5085 	case CTRL('b'):
5086 	case 'b':
5087 		if (s->first_displayed_line == 1) {
5088 			view->count = 0;
5089 			break;
5090 		}
5091 		i = 0;
5092 		while (i++ < nscroll && s->first_displayed_line > 1)
5093 			s->first_displayed_line--;
5094 		break;
5095 	case 'j':
5096 	case KEY_DOWN:
5097 	case CTRL('n'):
5098 		if (!s->eof)
5099 			s->first_displayed_line++;
5100 		else
5101 			view->count = 0;
5102 		break;
5103 	case CTRL('d'):
5104 	case 'd':
5105 		nscroll /= 2;
5106 		/* FALL THROUGH */
5107 	case KEY_NPAGE:
5108 	case CTRL('f'):
5109 	case 'f':
5110 	case ' ':
5111 		if (s->eof) {
5112 			view->count = 0;
5113 			break;
5114 		}
5115 		i = 0;
5116 		while (!s->eof && i++ < nscroll) {
5117 			linelen = getline(&line, &linesize, s->f);
5118 			s->first_displayed_line++;
5119 			if (linelen == -1) {
5120 				if (feof(s->f)) {
5121 					s->eof = 1;
5122 				} else
5123 					err = got_ferror(s->f, GOT_ERR_IO);
5124 				break;
5125 			}
5126 		}
5127 		free(line);
5128 		break;
5129 	case '(':
5130 		diff_prev_index(s, GOT_DIFF_LINE_BLOB_MIN);
5131 		break;
5132 	case ')':
5133 		diff_next_index(s, GOT_DIFF_LINE_BLOB_MIN);
5134 		break;
5135 	case '{':
5136 		diff_prev_index(s, GOT_DIFF_LINE_HUNK);
5137 		break;
5138 	case '}':
5139 		diff_next_index(s, GOT_DIFF_LINE_HUNK);
5140 		break;
5141 	case '[':
5142 		if (s->diff_context > 0) {
5143 			s->diff_context--;
5144 			s->matched_line = 0;
5145 			diff_view_indicate_progress(view);
5146 			err = create_diff(s);
5147 			if (s->first_displayed_line + view->nlines - 1 >
5148 			    s->nlines) {
5149 				s->first_displayed_line = 1;
5150 				s->last_displayed_line = view->nlines;
5151 			}
5152 		} else
5153 			view->count = 0;
5154 		break;
5155 	case ']':
5156 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
5157 			s->diff_context++;
5158 			s->matched_line = 0;
5159 			diff_view_indicate_progress(view);
5160 			err = create_diff(s);
5161 		} else
5162 			view->count = 0;
5163 		break;
5164 	case '<':
5165 	case ',':
5166 	case 'K':
5167 		up = 1;
5168 		/* FALL THROUGH */
5169 	case '>':
5170 	case '.':
5171 	case 'J':
5172 		if (s->parent_view == NULL) {
5173 			view->count = 0;
5174 			break;
5175 		}
5176 		s->parent_view->count = view->count;
5177 
5178 		if (s->parent_view->type == TOG_VIEW_LOG) {
5179 			ls = &s->parent_view->state.log;
5180 			old_selected_entry = ls->selected_entry;
5181 
5182 			err = input_log_view(NULL, s->parent_view,
5183 			    up ? KEY_UP : KEY_DOWN);
5184 			if (err)
5185 				break;
5186 			view->count = s->parent_view->count;
5187 
5188 			if (old_selected_entry == ls->selected_entry)
5189 				break;
5190 
5191 			err = set_selected_commit(s, ls->selected_entry);
5192 			if (err)
5193 				break;
5194 		} else if (s->parent_view->type == TOG_VIEW_BLAME) {
5195 			struct tog_blame_view_state *bs;
5196 			struct got_object_id *id, *prev_id;
5197 
5198 			bs = &s->parent_view->state.blame;
5199 			prev_id = get_annotation_for_line(bs->blame.lines,
5200 			    bs->blame.nlines, bs->last_diffed_line);
5201 
5202 			err = input_blame_view(&view, s->parent_view,
5203 			    up ? KEY_UP : KEY_DOWN);
5204 			if (err)
5205 				break;
5206 			view->count = s->parent_view->count;
5207 
5208 			if (prev_id == NULL)
5209 				break;
5210 			id = get_selected_commit_id(bs->blame.lines,
5211 			    bs->blame.nlines, bs->first_displayed_line,
5212 			    bs->selected_line);
5213 			if (id == NULL)
5214 				break;
5215 
5216 			if (!got_object_id_cmp(prev_id, id))
5217 				break;
5218 
5219 			err = input_blame_view(&view, s->parent_view, KEY_ENTER);
5220 			if (err)
5221 				break;
5222 		}
5223 		s->first_displayed_line = 1;
5224 		s->last_displayed_line = view->nlines;
5225 		s->matched_line = 0;
5226 		view->x = 0;
5227 
5228 		diff_view_indicate_progress(view);
5229 		err = create_diff(s);
5230 		break;
5231 	default:
5232 		view->count = 0;
5233 		break;
5234 	}
5235 
5236 	return err;
5237 }
5238 
5239 static const struct got_error *
5240 cmd_diff(int argc, char *argv[])
5241 {
5242 	const struct got_error *error = NULL;
5243 	struct got_repository *repo = NULL;
5244 	struct got_worktree *worktree = NULL;
5245 	struct got_object_id *id1 = NULL, *id2 = NULL;
5246 	char *repo_path = NULL, *cwd = NULL;
5247 	char *id_str1 = NULL, *id_str2 = NULL;
5248 	char *label1 = NULL, *label2 = NULL;
5249 	int diff_context = 3, ignore_whitespace = 0;
5250 	int ch, force_text_diff = 0;
5251 	const char *errstr;
5252 	struct tog_view *view;
5253 	int *pack_fds = NULL;
5254 
5255 	while ((ch = getopt(argc, argv, "aC:r:w")) != -1) {
5256 		switch (ch) {
5257 		case 'a':
5258 			force_text_diff = 1;
5259 			break;
5260 		case 'C':
5261 			diff_context = strtonum(optarg, 0, GOT_DIFF_MAX_CONTEXT,
5262 			    &errstr);
5263 			if (errstr != NULL)
5264 				errx(1, "number of context lines is %s: %s",
5265 				    errstr, errstr);
5266 			break;
5267 		case 'r':
5268 			repo_path = realpath(optarg, NULL);
5269 			if (repo_path == NULL)
5270 				return got_error_from_errno2("realpath",
5271 				    optarg);
5272 			got_path_strip_trailing_slashes(repo_path);
5273 			break;
5274 		case 'w':
5275 			ignore_whitespace = 1;
5276 			break;
5277 		default:
5278 			usage_diff();
5279 			/* NOTREACHED */
5280 		}
5281 	}
5282 
5283 	argc -= optind;
5284 	argv += optind;
5285 
5286 	if (argc == 0) {
5287 		usage_diff(); /* TODO show local worktree changes */
5288 	} else if (argc == 2) {
5289 		id_str1 = argv[0];
5290 		id_str2 = argv[1];
5291 	} else
5292 		usage_diff();
5293 
5294 	error = got_repo_pack_fds_open(&pack_fds);
5295 	if (error)
5296 		goto done;
5297 
5298 	if (repo_path == NULL) {
5299 		cwd = getcwd(NULL, 0);
5300 		if (cwd == NULL)
5301 			return got_error_from_errno("getcwd");
5302 		error = got_worktree_open(&worktree, cwd);
5303 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
5304 			goto done;
5305 		if (worktree)
5306 			repo_path =
5307 			    strdup(got_worktree_get_repo_path(worktree));
5308 		else
5309 			repo_path = strdup(cwd);
5310 		if (repo_path == NULL) {
5311 			error = got_error_from_errno("strdup");
5312 			goto done;
5313 		}
5314 	}
5315 
5316 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
5317 	if (error)
5318 		goto done;
5319 
5320 	init_curses();
5321 
5322 	error = apply_unveil(got_repo_get_path(repo), NULL);
5323 	if (error)
5324 		goto done;
5325 
5326 	error = tog_load_refs(repo, 0);
5327 	if (error)
5328 		goto done;
5329 
5330 	error = got_repo_match_object_id(&id1, &label1, id_str1,
5331 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5332 	if (error)
5333 		goto done;
5334 
5335 	error = got_repo_match_object_id(&id2, &label2, id_str2,
5336 	    GOT_OBJ_TYPE_ANY, &tog_refs, repo);
5337 	if (error)
5338 		goto done;
5339 
5340 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
5341 	if (view == NULL) {
5342 		error = got_error_from_errno("view_open");
5343 		goto done;
5344 	}
5345 	error = open_diff_view(view, id1, id2, label1, label2, diff_context,
5346 	    ignore_whitespace, force_text_diff, NULL,  repo);
5347 	if (error)
5348 		goto done;
5349 	error = view_loop(view);
5350 done:
5351 	free(label1);
5352 	free(label2);
5353 	free(repo_path);
5354 	free(cwd);
5355 	if (repo) {
5356 		const struct got_error *close_err = got_repo_close(repo);
5357 		if (error == NULL)
5358 			error = close_err;
5359 	}
5360 	if (worktree)
5361 		got_worktree_close(worktree);
5362 	if (pack_fds) {
5363 		const struct got_error *pack_err =
5364 		    got_repo_pack_fds_close(pack_fds);
5365 		if (error == NULL)
5366 			error = pack_err;
5367 	}
5368 	tog_free_refs();
5369 	return error;
5370 }
5371 
5372 __dead static void
5373 usage_blame(void)
5374 {
5375 	endwin();
5376 	fprintf(stderr,
5377 	    "usage: %s blame [-c commit] [-r repository-path] path\n",
5378 	    getprogname());
5379 	exit(1);
5380 }
5381 
5382 struct tog_blame_line {
5383 	int annotated;
5384 	struct got_object_id *id;
5385 };
5386 
5387 static const struct got_error *
5388 draw_blame(struct tog_view *view)
5389 {
5390 	struct tog_blame_view_state *s = &view->state.blame;
5391 	struct tog_blame *blame = &s->blame;
5392 	regmatch_t *regmatch = &view->regmatch;
5393 	const struct got_error *err;
5394 	int lineno = 0, nprinted = 0;
5395 	char *line = NULL;
5396 	size_t linesize = 0;
5397 	ssize_t linelen;
5398 	wchar_t *wline;
5399 	int width;
5400 	struct tog_blame_line *blame_line;
5401 	struct got_object_id *prev_id = NULL;
5402 	char *id_str;
5403 	struct tog_color *tc;
5404 
5405 	err = got_object_id_str(&id_str, &s->blamed_commit->id);
5406 	if (err)
5407 		return err;
5408 
5409 	rewind(blame->f);
5410 	werase(view->window);
5411 
5412 	if (asprintf(&line, "commit %s", id_str) == -1) {
5413 		err = got_error_from_errno("asprintf");
5414 		free(id_str);
5415 		return err;
5416 	}
5417 
5418 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5419 	free(line);
5420 	line = NULL;
5421 	if (err)
5422 		return err;
5423 	if (view_needs_focus_indication(view))
5424 		wstandout(view->window);
5425 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5426 	if (tc)
5427 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
5428 	waddwstr(view->window, wline);
5429 	while (width++ < view->ncols)
5430 		waddch(view->window, ' ');
5431 	if (tc)
5432 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
5433 	if (view_needs_focus_indication(view))
5434 		wstandend(view->window);
5435 	free(wline);
5436 	wline = NULL;
5437 
5438 	if (view->gline > blame->nlines)
5439 		view->gline = blame->nlines;
5440 
5441 	if (asprintf(&line, "[%d/%d] %s%s", view->gline ? view->gline :
5442 	    s->first_displayed_line - 1 + s->selected_line, blame->nlines,
5443 	    s->blame_complete ? "" : "annotating... ", s->path) == -1) {
5444 		free(id_str);
5445 		return got_error_from_errno("asprintf");
5446 	}
5447 	free(id_str);
5448 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
5449 	free(line);
5450 	line = NULL;
5451 	if (err)
5452 		return err;
5453 	waddwstr(view->window, wline);
5454 	free(wline);
5455 	wline = NULL;
5456 	if (width < view->ncols - 1)
5457 		waddch(view->window, '\n');
5458 
5459 	s->eof = 0;
5460 	view->maxx = 0;
5461 	while (nprinted < view->nlines - 2) {
5462 		linelen = getline(&line, &linesize, blame->f);
5463 		if (linelen == -1) {
5464 			if (feof(blame->f)) {
5465 				s->eof = 1;
5466 				break;
5467 			}
5468 			free(line);
5469 			return got_ferror(blame->f, GOT_ERR_IO);
5470 		}
5471 		if (++lineno < s->first_displayed_line)
5472 			continue;
5473 		if (view->gline && !gotoline(view, &lineno, &nprinted))
5474 			continue;
5475 
5476 		/* Set view->maxx based on full line length. */
5477 		err = format_line(&wline, &width, NULL, line, 0, INT_MAX, 9, 1);
5478 		if (err) {
5479 			free(line);
5480 			return err;
5481 		}
5482 		free(wline);
5483 		wline = NULL;
5484 		view->maxx = MAX(view->maxx, width);
5485 
5486 		if (nprinted == s->selected_line - 1)
5487 			wstandout(view->window);
5488 
5489 		if (blame->nlines > 0) {
5490 			blame_line = &blame->lines[lineno - 1];
5491 			if (blame_line->annotated && prev_id &&
5492 			    got_object_id_cmp(prev_id, blame_line->id) == 0 &&
5493 			    !(nprinted == s->selected_line - 1)) {
5494 				waddstr(view->window, "        ");
5495 			} else if (blame_line->annotated) {
5496 				char *id_str;
5497 				err = got_object_id_str(&id_str,
5498 				    blame_line->id);
5499 				if (err) {
5500 					free(line);
5501 					return err;
5502 				}
5503 				tc = get_color(&s->colors, TOG_COLOR_COMMIT);
5504 				if (tc)
5505 					wattr_on(view->window,
5506 					    COLOR_PAIR(tc->colorpair), NULL);
5507 				wprintw(view->window, "%.8s", id_str);
5508 				if (tc)
5509 					wattr_off(view->window,
5510 					    COLOR_PAIR(tc->colorpair), NULL);
5511 				free(id_str);
5512 				prev_id = blame_line->id;
5513 			} else {
5514 				waddstr(view->window, "........");
5515 				prev_id = NULL;
5516 			}
5517 		} else {
5518 			waddstr(view->window, "........");
5519 			prev_id = NULL;
5520 		}
5521 
5522 		if (nprinted == s->selected_line - 1)
5523 			wstandend(view->window);
5524 		waddstr(view->window, " ");
5525 
5526 		if (view->ncols <= 9) {
5527 			width = 9;
5528 		} else if (s->first_displayed_line + nprinted ==
5529 		    s->matched_line &&
5530 		    regmatch->rm_so >= 0 && regmatch->rm_so < regmatch->rm_eo) {
5531 			err = add_matched_line(&width, line, view->ncols - 9, 9,
5532 			    view->window, view->x, regmatch);
5533 			if (err) {
5534 				free(line);
5535 				return err;
5536 			}
5537 			width += 9;
5538 		} else {
5539 			int skip;
5540 			err = format_line(&wline, &width, &skip, line,
5541 			    view->x, view->ncols - 9, 9, 1);
5542 			if (err) {
5543 				free(line);
5544 				return err;
5545 			}
5546 			waddwstr(view->window, &wline[skip]);
5547 			width += 9;
5548 			free(wline);
5549 			wline = NULL;
5550 		}
5551 
5552 		if (width <= view->ncols - 1)
5553 			waddch(view->window, '\n');
5554 		if (++nprinted == 1)
5555 			s->first_displayed_line = lineno;
5556 	}
5557 	free(line);
5558 	s->last_displayed_line = lineno;
5559 
5560 	view_border(view);
5561 
5562 	return NULL;
5563 }
5564 
5565 static const struct got_error *
5566 blame_cb(void *arg, int nlines, int lineno,
5567     struct got_commit_object *commit, struct got_object_id *id)
5568 {
5569 	const struct got_error *err = NULL;
5570 	struct tog_blame_cb_args *a = arg;
5571 	struct tog_blame_line *line;
5572 	int errcode;
5573 
5574 	if (nlines != a->nlines ||
5575 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
5576 		return got_error(GOT_ERR_RANGE);
5577 
5578 	errcode = pthread_mutex_lock(&tog_mutex);
5579 	if (errcode)
5580 		return got_error_set_errno(errcode, "pthread_mutex_lock");
5581 
5582 	if (*a->quit) {	/* user has quit the blame view */
5583 		err = got_error(GOT_ERR_ITER_COMPLETED);
5584 		goto done;
5585 	}
5586 
5587 	if (lineno == -1)
5588 		goto done; /* no change in this commit */
5589 
5590 	line = &a->lines[lineno - 1];
5591 	if (line->annotated)
5592 		goto done;
5593 
5594 	line->id = got_object_id_dup(id);
5595 	if (line->id == NULL) {
5596 		err = got_error_from_errno("got_object_id_dup");
5597 		goto done;
5598 	}
5599 	line->annotated = 1;
5600 done:
5601 	errcode = pthread_mutex_unlock(&tog_mutex);
5602 	if (errcode)
5603 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5604 	return err;
5605 }
5606 
5607 static void *
5608 blame_thread(void *arg)
5609 {
5610 	const struct got_error *err, *close_err;
5611 	struct tog_blame_thread_args *ta = arg;
5612 	struct tog_blame_cb_args *a = ta->cb_args;
5613 	int errcode, fd1 = -1, fd2 = -1;
5614 	FILE *f1 = NULL, *f2 = NULL;
5615 
5616 	fd1 = got_opentempfd();
5617 	if (fd1 == -1)
5618 		return (void *)got_error_from_errno("got_opentempfd");
5619 
5620 	fd2 = got_opentempfd();
5621 	if (fd2 == -1) {
5622 		err = got_error_from_errno("got_opentempfd");
5623 		goto done;
5624 	}
5625 
5626 	f1 = got_opentemp();
5627 	if (f1 == NULL) {
5628 		err = (void *)got_error_from_errno("got_opentemp");
5629 		goto done;
5630 	}
5631 	f2 = got_opentemp();
5632 	if (f2 == NULL) {
5633 		err = (void *)got_error_from_errno("got_opentemp");
5634 		goto done;
5635 	}
5636 
5637 	err = block_signals_used_by_main_thread();
5638 	if (err)
5639 		goto done;
5640 
5641 	err = got_blame(ta->path, a->commit_id, ta->repo,
5642 	    tog_diff_algo, blame_cb, ta->cb_args,
5643 	    ta->cancel_cb, ta->cancel_arg, fd1, fd2, f1, f2);
5644 	if (err && err->code == GOT_ERR_CANCELLED)
5645 		err = NULL;
5646 
5647 	errcode = pthread_mutex_lock(&tog_mutex);
5648 	if (errcode) {
5649 		err = got_error_set_errno(errcode, "pthread_mutex_lock");
5650 		goto done;
5651 	}
5652 
5653 	close_err = got_repo_close(ta->repo);
5654 	if (err == NULL)
5655 		err = close_err;
5656 	ta->repo = NULL;
5657 	*ta->complete = 1;
5658 
5659 	errcode = pthread_mutex_unlock(&tog_mutex);
5660 	if (errcode && err == NULL)
5661 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
5662 
5663 done:
5664 	if (fd1 != -1 && close(fd1) == -1 && err == NULL)
5665 		err = got_error_from_errno("close");
5666 	if (fd2 != -1 && close(fd2) == -1 && err == NULL)
5667 		err = got_error_from_errno("close");
5668 	if (f1 && fclose(f1) == EOF && err == NULL)
5669 		err = got_error_from_errno("fclose");
5670 	if (f2 && fclose(f2) == EOF && err == NULL)
5671 		err = got_error_from_errno("fclose");
5672 
5673 	return (void *)err;
5674 }
5675 
5676 static struct got_object_id *
5677 get_selected_commit_id(struct tog_blame_line *lines, int nlines,
5678     int first_displayed_line, int selected_line)
5679 {
5680 	struct tog_blame_line *line;
5681 
5682 	if (nlines <= 0)
5683 		return NULL;
5684 
5685 	line = &lines[first_displayed_line - 1 + selected_line - 1];
5686 	if (!line->annotated)
5687 		return NULL;
5688 
5689 	return line->id;
5690 }
5691 
5692 static struct got_object_id *
5693 get_annotation_for_line(struct tog_blame_line *lines, int nlines,
5694     int lineno)
5695 {
5696 	struct tog_blame_line *line;
5697 
5698 	if (nlines <= 0 || lineno >= nlines)
5699 		return NULL;
5700 
5701 	line = &lines[lineno - 1];
5702 	if (!line->annotated)
5703 		return NULL;
5704 
5705 	return line->id;
5706 }
5707 
5708 static const struct got_error *
5709 stop_blame(struct tog_blame *blame)
5710 {
5711 	const struct got_error *err = NULL;
5712 	int i;
5713 
5714 	if (blame->thread) {
5715 		int errcode;
5716 		errcode = pthread_mutex_unlock(&tog_mutex);
5717 		if (errcode)
5718 			return got_error_set_errno(errcode,
5719 			    "pthread_mutex_unlock");
5720 		errcode = pthread_join(blame->thread, (void **)&err);
5721 		if (errcode)
5722 			return got_error_set_errno(errcode, "pthread_join");
5723 		errcode = pthread_mutex_lock(&tog_mutex);
5724 		if (errcode)
5725 			return got_error_set_errno(errcode,
5726 			    "pthread_mutex_lock");
5727 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
5728 			err = NULL;
5729 		blame->thread = 0; //NULL;
5730 	}
5731 	if (blame->thread_args.repo) {
5732 		const struct got_error *close_err;
5733 		close_err = got_repo_close(blame->thread_args.repo);
5734 		if (err == NULL)
5735 			err = close_err;
5736 		blame->thread_args.repo = NULL;
5737 	}
5738 	if (blame->f) {
5739 		if (fclose(blame->f) == EOF && err == NULL)
5740 			err = got_error_from_errno("fclose");
5741 		blame->f = NULL;
5742 	}
5743 	if (blame->lines) {
5744 		for (i = 0; i < blame->nlines; i++)
5745 			free(blame->lines[i].id);
5746 		free(blame->lines);
5747 		blame->lines = NULL;
5748 	}
5749 	free(blame->cb_args.commit_id);
5750 	blame->cb_args.commit_id = NULL;
5751 	if (blame->pack_fds) {
5752 		const struct got_error *pack_err =
5753 		    got_repo_pack_fds_close(blame->pack_fds);
5754 		if (err == NULL)
5755 			err = pack_err;
5756 		blame->pack_fds = NULL;
5757 	}
5758 	return err;
5759 }
5760 
5761 static const struct got_error *
5762 cancel_blame_view(void *arg)
5763 {
5764 	const struct got_error *err = NULL;
5765 	int *done = arg;
5766 	int errcode;
5767 
5768 	errcode = pthread_mutex_lock(&tog_mutex);
5769 	if (errcode)
5770 		return got_error_set_errno(errcode,
5771 		    "pthread_mutex_unlock");
5772 
5773 	if (*done)
5774 		err = got_error(GOT_ERR_CANCELLED);
5775 
5776 	errcode = pthread_mutex_unlock(&tog_mutex);
5777 	if (errcode)
5778 		return got_error_set_errno(errcode,
5779 		    "pthread_mutex_lock");
5780 
5781 	return err;
5782 }
5783 
5784 static const struct got_error *
5785 run_blame(struct tog_view *view)
5786 {
5787 	struct tog_blame_view_state *s = &view->state.blame;
5788 	struct tog_blame *blame = &s->blame;
5789 	const struct got_error *err = NULL;
5790 	struct got_commit_object *commit = NULL;
5791 	struct got_blob_object *blob = NULL;
5792 	struct got_repository *thread_repo = NULL;
5793 	struct got_object_id *obj_id = NULL;
5794 	int obj_type, fd = -1;
5795 	int *pack_fds = NULL;
5796 
5797 	err = got_object_open_as_commit(&commit, s->repo,
5798 	    &s->blamed_commit->id);
5799 	if (err)
5800 		return err;
5801 
5802 	fd = got_opentempfd();
5803 	if (fd == -1) {
5804 		err = got_error_from_errno("got_opentempfd");
5805 		goto done;
5806 	}
5807 
5808 	err = got_object_id_by_path(&obj_id, s->repo, commit, s->path);
5809 	if (err)
5810 		goto done;
5811 
5812 	err = got_object_get_type(&obj_type, s->repo, obj_id);
5813 	if (err)
5814 		goto done;
5815 
5816 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
5817 		err = got_error(GOT_ERR_OBJ_TYPE);
5818 		goto done;
5819 	}
5820 
5821 	err = got_object_open_as_blob(&blob, s->repo, obj_id, 8192, fd);
5822 	if (err)
5823 		goto done;
5824 	blame->f = got_opentemp();
5825 	if (blame->f == NULL) {
5826 		err = got_error_from_errno("got_opentemp");
5827 		goto done;
5828 	}
5829 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
5830 	    &blame->line_offsets, blame->f, blob);
5831 	if (err)
5832 		goto done;
5833 	if (blame->nlines == 0) {
5834 		s->blame_complete = 1;
5835 		goto done;
5836 	}
5837 
5838 	/* Don't include \n at EOF in the blame line count. */
5839 	if (blame->line_offsets[blame->nlines - 1] == blame->filesize)
5840 		blame->nlines--;
5841 
5842 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
5843 	if (blame->lines == NULL) {
5844 		err = got_error_from_errno("calloc");
5845 		goto done;
5846 	}
5847 
5848 	err = got_repo_pack_fds_open(&pack_fds);
5849 	if (err)
5850 		goto done;
5851 	err = got_repo_open(&thread_repo, got_repo_get_path(s->repo), NULL,
5852 	    pack_fds);
5853 	if (err)
5854 		goto done;
5855 
5856 	blame->pack_fds = pack_fds;
5857 	blame->cb_args.view = view;
5858 	blame->cb_args.lines = blame->lines;
5859 	blame->cb_args.nlines = blame->nlines;
5860 	blame->cb_args.commit_id = got_object_id_dup(&s->blamed_commit->id);
5861 	if (blame->cb_args.commit_id == NULL) {
5862 		err = got_error_from_errno("got_object_id_dup");
5863 		goto done;
5864 	}
5865 	blame->cb_args.quit = &s->done;
5866 
5867 	blame->thread_args.path = s->path;
5868 	blame->thread_args.repo = thread_repo;
5869 	blame->thread_args.cb_args = &blame->cb_args;
5870 	blame->thread_args.complete = &s->blame_complete;
5871 	blame->thread_args.cancel_cb = cancel_blame_view;
5872 	blame->thread_args.cancel_arg = &s->done;
5873 	s->blame_complete = 0;
5874 
5875 	if (s->first_displayed_line + view->nlines - 1 > blame->nlines) {
5876 		s->first_displayed_line = 1;
5877 		s->last_displayed_line = view->nlines;
5878 		s->selected_line = 1;
5879 	}
5880 	s->matched_line = 0;
5881 
5882 done:
5883 	if (commit)
5884 		got_object_commit_close(commit);
5885 	if (fd != -1 && close(fd) == -1 && err == NULL)
5886 		err = got_error_from_errno("close");
5887 	if (blob)
5888 		got_object_blob_close(blob);
5889 	free(obj_id);
5890 	if (err)
5891 		stop_blame(blame);
5892 	return err;
5893 }
5894 
5895 static const struct got_error *
5896 open_blame_view(struct tog_view *view, char *path,
5897     struct got_object_id *commit_id, struct got_repository *repo)
5898 {
5899 	const struct got_error *err = NULL;
5900 	struct tog_blame_view_state *s = &view->state.blame;
5901 
5902 	STAILQ_INIT(&s->blamed_commits);
5903 
5904 	s->path = strdup(path);
5905 	if (s->path == NULL)
5906 		return got_error_from_errno("strdup");
5907 
5908 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
5909 	if (err) {
5910 		free(s->path);
5911 		return err;
5912 	}
5913 
5914 	STAILQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
5915 	s->first_displayed_line = 1;
5916 	s->last_displayed_line = view->nlines;
5917 	s->selected_line = 1;
5918 	s->blame_complete = 0;
5919 	s->repo = repo;
5920 	s->commit_id = commit_id;
5921 	memset(&s->blame, 0, sizeof(s->blame));
5922 
5923 	STAILQ_INIT(&s->colors);
5924 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
5925 		err = add_color(&s->colors, "^", TOG_COLOR_COMMIT,
5926 		    get_color_value("TOG_COLOR_COMMIT"));
5927 		if (err)
5928 			return err;
5929 	}
5930 
5931 	view->show = show_blame_view;
5932 	view->input = input_blame_view;
5933 	view->reset = reset_blame_view;
5934 	view->close = close_blame_view;
5935 	view->search_start = search_start_blame_view;
5936 	view->search_next = search_next_blame_view;
5937 
5938 	return run_blame(view);
5939 }
5940 
5941 static const struct got_error *
5942 close_blame_view(struct tog_view *view)
5943 {
5944 	const struct got_error *err = NULL;
5945 	struct tog_blame_view_state *s = &view->state.blame;
5946 
5947 	if (s->blame.thread)
5948 		err = stop_blame(&s->blame);
5949 
5950 	while (!STAILQ_EMPTY(&s->blamed_commits)) {
5951 		struct got_object_qid *blamed_commit;
5952 		blamed_commit = STAILQ_FIRST(&s->blamed_commits);
5953 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
5954 		got_object_qid_free(blamed_commit);
5955 	}
5956 
5957 	free(s->path);
5958 	free_colors(&s->colors);
5959 	return err;
5960 }
5961 
5962 static const struct got_error *
5963 search_start_blame_view(struct tog_view *view)
5964 {
5965 	struct tog_blame_view_state *s = &view->state.blame;
5966 
5967 	s->matched_line = 0;
5968 	return NULL;
5969 }
5970 
5971 static const struct got_error *
5972 search_next_blame_view(struct tog_view *view)
5973 {
5974 	struct tog_blame_view_state *s = &view->state.blame;
5975 	const struct got_error *err = NULL;
5976 	int lineno;
5977 	char *line = NULL;
5978 	size_t linesize = 0;
5979 	ssize_t linelen;
5980 
5981 	if (!view->searching) {
5982 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
5983 		return NULL;
5984 	}
5985 
5986 	if (s->matched_line) {
5987 		if (view->searching == TOG_SEARCH_FORWARD)
5988 			lineno = s->matched_line + 1;
5989 		else
5990 			lineno = s->matched_line - 1;
5991 	} else
5992 		lineno = s->first_displayed_line - 1 + s->selected_line;
5993 
5994 	while (1) {
5995 		off_t offset;
5996 
5997 		if (lineno <= 0 || lineno > s->blame.nlines) {
5998 			if (s->matched_line == 0) {
5999 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6000 				break;
6001 			}
6002 
6003 			if (view->searching == TOG_SEARCH_FORWARD)
6004 				lineno = 1;
6005 			else
6006 				lineno = s->blame.nlines;
6007 		}
6008 
6009 		offset = s->blame.line_offsets[lineno - 1];
6010 		if (fseeko(s->blame.f, offset, SEEK_SET) != 0) {
6011 			free(line);
6012 			return got_error_from_errno("fseeko");
6013 		}
6014 		linelen = getline(&line, &linesize, s->blame.f);
6015 		if (linelen != -1) {
6016 			char *exstr;
6017 			err = expand_tab(&exstr, line);
6018 			if (err)
6019 				break;
6020 			if (match_line(exstr, &view->regex, 1,
6021 			    &view->regmatch)) {
6022 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
6023 				s->matched_line = lineno;
6024 				free(exstr);
6025 				break;
6026 			}
6027 			free(exstr);
6028 		}
6029 		if (view->searching == TOG_SEARCH_FORWARD)
6030 			lineno++;
6031 		else
6032 			lineno--;
6033 	}
6034 	free(line);
6035 
6036 	if (s->matched_line) {
6037 		s->first_displayed_line = s->matched_line;
6038 		s->selected_line = 1;
6039 	}
6040 
6041 	return err;
6042 }
6043 
6044 static const struct got_error *
6045 show_blame_view(struct tog_view *view)
6046 {
6047 	const struct got_error *err = NULL;
6048 	struct tog_blame_view_state *s = &view->state.blame;
6049 	int errcode;
6050 
6051 	if (s->blame.thread == 0 && !s->blame_complete) {
6052 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
6053 		    &s->blame.thread_args);
6054 		if (errcode)
6055 			return got_error_set_errno(errcode, "pthread_create");
6056 
6057 		halfdelay(1); /* fast refresh while annotating  */
6058 	}
6059 
6060 	if (s->blame_complete)
6061 		halfdelay(10); /* disable fast refresh */
6062 
6063 	err = draw_blame(view);
6064 
6065 	view_border(view);
6066 	return err;
6067 }
6068 
6069 static const struct got_error *
6070 log_annotated_line(struct tog_view **new_view, int begin_y, int begin_x,
6071     struct got_repository *repo, struct got_object_id *id)
6072 {
6073 	struct tog_view		*log_view;
6074 	const struct got_error	*err = NULL;
6075 
6076 	*new_view = NULL;
6077 
6078 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6079 	if (log_view == NULL)
6080 		return got_error_from_errno("view_open");
6081 
6082 	err = open_log_view(log_view, id, repo, GOT_REF_HEAD, "", 0);
6083 	if (err)
6084 		view_close(log_view);
6085 	else
6086 		*new_view = log_view;
6087 
6088 	return err;
6089 }
6090 
6091 static const struct got_error *
6092 input_blame_view(struct tog_view **new_view, struct tog_view *view, int ch)
6093 {
6094 	const struct got_error *err = NULL, *thread_err = NULL;
6095 	struct tog_view *diff_view;
6096 	struct tog_blame_view_state *s = &view->state.blame;
6097 	int eos, nscroll, begin_y = 0, begin_x = 0;
6098 
6099 	eos = nscroll = view->nlines - 2;
6100 	if (view_is_hsplit_top(view))
6101 		--eos;  /* border */
6102 
6103 	switch (ch) {
6104 	case '0':
6105 		view->x = 0;
6106 		break;
6107 	case '$':
6108 		view->x = MAX(view->maxx - view->ncols / 3, 0);
6109 		view->count = 0;
6110 		break;
6111 	case KEY_RIGHT:
6112 	case 'l':
6113 		if (view->x + view->ncols / 3 < view->maxx)
6114 			view->x += 2;  /* move two columns right */
6115 		else
6116 			view->count = 0;
6117 		break;
6118 	case KEY_LEFT:
6119 	case 'h':
6120 		view->x -= MIN(view->x, 2);  /* move two columns back */
6121 		if (view->x <= 0)
6122 			view->count = 0;
6123 		break;
6124 	case 'q':
6125 		s->done = 1;
6126 		break;
6127 	case 'g':
6128 	case KEY_HOME:
6129 		s->selected_line = 1;
6130 		s->first_displayed_line = 1;
6131 		view->count = 0;
6132 		break;
6133 	case 'G':
6134 	case KEY_END:
6135 		if (s->blame.nlines < eos) {
6136 			s->selected_line = s->blame.nlines;
6137 			s->first_displayed_line = 1;
6138 		} else {
6139 			s->selected_line = eos;
6140 			s->first_displayed_line = s->blame.nlines - (eos - 1);
6141 		}
6142 		view->count = 0;
6143 		break;
6144 	case 'k':
6145 	case KEY_UP:
6146 	case CTRL('p'):
6147 		if (s->selected_line > 1)
6148 			s->selected_line--;
6149 		else if (s->selected_line == 1 &&
6150 		    s->first_displayed_line > 1)
6151 			s->first_displayed_line--;
6152 		else
6153 			view->count = 0;
6154 		break;
6155 	case CTRL('u'):
6156 	case 'u':
6157 		nscroll /= 2;
6158 		/* FALL THROUGH */
6159 	case KEY_PPAGE:
6160 	case CTRL('b'):
6161 	case 'b':
6162 		if (s->first_displayed_line == 1) {
6163 			if (view->count > 1)
6164 				nscroll += nscroll;
6165 			s->selected_line = MAX(1, s->selected_line - nscroll);
6166 			view->count = 0;
6167 			break;
6168 		}
6169 		if (s->first_displayed_line > nscroll)
6170 			s->first_displayed_line -= nscroll;
6171 		else
6172 			s->first_displayed_line = 1;
6173 		break;
6174 	case 'j':
6175 	case KEY_DOWN:
6176 	case CTRL('n'):
6177 		if (s->selected_line < eos && s->first_displayed_line +
6178 		    s->selected_line <= s->blame.nlines)
6179 			s->selected_line++;
6180 		else if (s->first_displayed_line < s->blame.nlines - (eos - 1))
6181 			s->first_displayed_line++;
6182 		else
6183 			view->count = 0;
6184 		break;
6185 	case 'c':
6186 	case 'p': {
6187 		struct got_object_id *id = NULL;
6188 
6189 		view->count = 0;
6190 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6191 		    s->first_displayed_line, s->selected_line);
6192 		if (id == NULL)
6193 			break;
6194 		if (ch == 'p') {
6195 			struct got_commit_object *commit, *pcommit;
6196 			struct got_object_qid *pid;
6197 			struct got_object_id *blob_id = NULL;
6198 			int obj_type;
6199 			err = got_object_open_as_commit(&commit,
6200 			    s->repo, id);
6201 			if (err)
6202 				break;
6203 			pid = STAILQ_FIRST(
6204 			    got_object_commit_get_parent_ids(commit));
6205 			if (pid == NULL) {
6206 				got_object_commit_close(commit);
6207 				break;
6208 			}
6209 			/* Check if path history ends here. */
6210 			err = got_object_open_as_commit(&pcommit,
6211 			    s->repo, &pid->id);
6212 			if (err)
6213 				break;
6214 			err = got_object_id_by_path(&blob_id, s->repo,
6215 			    pcommit, s->path);
6216 			got_object_commit_close(pcommit);
6217 			if (err) {
6218 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
6219 					err = NULL;
6220 				got_object_commit_close(commit);
6221 				break;
6222 			}
6223 			err = got_object_get_type(&obj_type, s->repo,
6224 			    blob_id);
6225 			free(blob_id);
6226 			/* Can't blame non-blob type objects. */
6227 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
6228 				got_object_commit_close(commit);
6229 				break;
6230 			}
6231 			err = got_object_qid_alloc(&s->blamed_commit,
6232 			    &pid->id);
6233 			got_object_commit_close(commit);
6234 		} else {
6235 			if (got_object_id_cmp(id,
6236 			    &s->blamed_commit->id) == 0)
6237 				break;
6238 			err = got_object_qid_alloc(&s->blamed_commit,
6239 			    id);
6240 		}
6241 		if (err)
6242 			break;
6243 		s->done = 1;
6244 		thread_err = stop_blame(&s->blame);
6245 		s->done = 0;
6246 		if (thread_err)
6247 			break;
6248 		STAILQ_INSERT_HEAD(&s->blamed_commits,
6249 		    s->blamed_commit, entry);
6250 		err = run_blame(view);
6251 		if (err)
6252 			break;
6253 		break;
6254 	}
6255 	case 'C': {
6256 		struct got_object_qid *first;
6257 
6258 		view->count = 0;
6259 		first = STAILQ_FIRST(&s->blamed_commits);
6260 		if (!got_object_id_cmp(&first->id, s->commit_id))
6261 			break;
6262 		s->done = 1;
6263 		thread_err = stop_blame(&s->blame);
6264 		s->done = 0;
6265 		if (thread_err)
6266 			break;
6267 		STAILQ_REMOVE_HEAD(&s->blamed_commits, entry);
6268 		got_object_qid_free(s->blamed_commit);
6269 		s->blamed_commit =
6270 		    STAILQ_FIRST(&s->blamed_commits);
6271 		err = run_blame(view);
6272 		if (err)
6273 			break;
6274 		break;
6275 	}
6276 	case 'L':
6277 		view->count = 0;
6278 		s->id_to_log = get_selected_commit_id(s->blame.lines,
6279 		    s->blame.nlines, s->first_displayed_line, s->selected_line);
6280 		if (s->id_to_log)
6281 			err = view_request_new(new_view, view, TOG_VIEW_LOG);
6282 		break;
6283 	case KEY_ENTER:
6284 	case '\r': {
6285 		struct got_object_id *id = NULL;
6286 		struct got_object_qid *pid;
6287 		struct got_commit_object *commit = NULL;
6288 
6289 		view->count = 0;
6290 		id = get_selected_commit_id(s->blame.lines, s->blame.nlines,
6291 		    s->first_displayed_line, s->selected_line);
6292 		if (id == NULL)
6293 			break;
6294 		err = got_object_open_as_commit(&commit, s->repo, id);
6295 		if (err)
6296 			break;
6297 		pid = STAILQ_FIRST(got_object_commit_get_parent_ids(commit));
6298 		if (*new_view) {
6299 			/* traversed from diff view, release diff resources  */
6300 			err = close_diff_view(*new_view);
6301 			if (err)
6302 				break;
6303 			diff_view = *new_view;
6304 		} else {
6305 			if (view_is_parent_view(view))
6306 				view_get_split(view, &begin_y, &begin_x);
6307 
6308 			diff_view = view_open(0, 0, begin_y, begin_x,
6309 			    TOG_VIEW_DIFF);
6310 			if (diff_view == NULL) {
6311 				got_object_commit_close(commit);
6312 				err = got_error_from_errno("view_open");
6313 				break;
6314 			}
6315 		}
6316 		err = open_diff_view(diff_view, pid ? &pid->id : NULL,
6317 		    id, NULL, NULL, 3, 0, 0, view, s->repo);
6318 		got_object_commit_close(commit);
6319 		if (err) {
6320 			view_close(diff_view);
6321 			break;
6322 		}
6323 		s->last_diffed_line = s->first_displayed_line - 1 +
6324 		    s->selected_line;
6325 		if (*new_view)
6326 			break;	/* still open from active diff view */
6327 		if (view_is_parent_view(view) &&
6328 		    view->mode == TOG_VIEW_SPLIT_HRZN) {
6329 			err = view_init_hsplit(view, begin_y);
6330 			if (err)
6331 				break;
6332 		}
6333 
6334 		view->focussed = 0;
6335 		diff_view->focussed = 1;
6336 		diff_view->mode = view->mode;
6337 		diff_view->nlines = view->lines - begin_y;
6338 		if (view_is_parent_view(view)) {
6339 			view_transfer_size(diff_view, view);
6340 			err = view_close_child(view);
6341 			if (err)
6342 				break;
6343 			err = view_set_child(view, diff_view);
6344 			if (err)
6345 				break;
6346 			view->focus_child = 1;
6347 		} else
6348 			*new_view = diff_view;
6349 		if (err)
6350 			break;
6351 		break;
6352 	}
6353 	case CTRL('d'):
6354 	case 'd':
6355 		nscroll /= 2;
6356 		/* FALL THROUGH */
6357 	case KEY_NPAGE:
6358 	case CTRL('f'):
6359 	case 'f':
6360 	case ' ':
6361 		if (s->last_displayed_line >= s->blame.nlines &&
6362 		    s->selected_line >= MIN(s->blame.nlines,
6363 		    view->nlines - 2)) {
6364 			view->count = 0;
6365 			break;
6366 		}
6367 		if (s->last_displayed_line >= s->blame.nlines &&
6368 		    s->selected_line < view->nlines - 2) {
6369 			s->selected_line +=
6370 			    MIN(nscroll, s->last_displayed_line -
6371 			    s->first_displayed_line - s->selected_line + 1);
6372 		}
6373 		if (s->last_displayed_line + nscroll <= s->blame.nlines)
6374 			s->first_displayed_line += nscroll;
6375 		else
6376 			s->first_displayed_line =
6377 			    s->blame.nlines - (view->nlines - 3);
6378 		break;
6379 	case KEY_RESIZE:
6380 		if (s->selected_line > view->nlines - 2) {
6381 			s->selected_line = MIN(s->blame.nlines,
6382 			    view->nlines - 2);
6383 		}
6384 		break;
6385 	default:
6386 		view->count = 0;
6387 		break;
6388 	}
6389 	return thread_err ? thread_err : err;
6390 }
6391 
6392 static const struct got_error *
6393 reset_blame_view(struct tog_view *view)
6394 {
6395 	const struct got_error *err;
6396 	struct tog_blame_view_state *s = &view->state.blame;
6397 
6398 	view->count = 0;
6399 	s->done = 1;
6400 	err = stop_blame(&s->blame);
6401 	s->done = 0;
6402 	if (err)
6403 		return err;
6404 	return run_blame(view);
6405 }
6406 
6407 static const struct got_error *
6408 cmd_blame(int argc, char *argv[])
6409 {
6410 	const struct got_error *error;
6411 	struct got_repository *repo = NULL;
6412 	struct got_worktree *worktree = NULL;
6413 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
6414 	char *link_target = NULL;
6415 	struct got_object_id *commit_id = NULL;
6416 	struct got_commit_object *commit = NULL;
6417 	char *commit_id_str = NULL;
6418 	int ch;
6419 	struct tog_view *view;
6420 	int *pack_fds = NULL;
6421 
6422 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
6423 		switch (ch) {
6424 		case 'c':
6425 			commit_id_str = optarg;
6426 			break;
6427 		case 'r':
6428 			repo_path = realpath(optarg, NULL);
6429 			if (repo_path == NULL)
6430 				return got_error_from_errno2("realpath",
6431 				    optarg);
6432 			break;
6433 		default:
6434 			usage_blame();
6435 			/* NOTREACHED */
6436 		}
6437 	}
6438 
6439 	argc -= optind;
6440 	argv += optind;
6441 
6442 	if (argc != 1)
6443 		usage_blame();
6444 
6445 	error = got_repo_pack_fds_open(&pack_fds);
6446 	if (error != NULL)
6447 		goto done;
6448 
6449 	if (repo_path == NULL) {
6450 		cwd = getcwd(NULL, 0);
6451 		if (cwd == NULL)
6452 			return got_error_from_errno("getcwd");
6453 		error = got_worktree_open(&worktree, cwd);
6454 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
6455 			goto done;
6456 		if (worktree)
6457 			repo_path =
6458 			    strdup(got_worktree_get_repo_path(worktree));
6459 		else
6460 			repo_path = strdup(cwd);
6461 		if (repo_path == NULL) {
6462 			error = got_error_from_errno("strdup");
6463 			goto done;
6464 		}
6465 	}
6466 
6467 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
6468 	if (error != NULL)
6469 		goto done;
6470 
6471 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv, repo,
6472 	    worktree);
6473 	if (error)
6474 		goto done;
6475 
6476 	init_curses();
6477 
6478 	error = apply_unveil(got_repo_get_path(repo), NULL);
6479 	if (error)
6480 		goto done;
6481 
6482 	error = tog_load_refs(repo, 0);
6483 	if (error)
6484 		goto done;
6485 
6486 	if (commit_id_str == NULL) {
6487 		struct got_reference *head_ref;
6488 		error = got_ref_open(&head_ref, repo, worktree ?
6489 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD, 0);
6490 		if (error != NULL)
6491 			goto done;
6492 		error = got_ref_resolve(&commit_id, repo, head_ref);
6493 		got_ref_close(head_ref);
6494 	} else {
6495 		error = got_repo_match_object_id(&commit_id, NULL,
6496 		    commit_id_str, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
6497 	}
6498 	if (error != NULL)
6499 		goto done;
6500 
6501 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
6502 	if (view == NULL) {
6503 		error = got_error_from_errno("view_open");
6504 		goto done;
6505 	}
6506 
6507 	error = got_object_open_as_commit(&commit, repo, commit_id);
6508 	if (error)
6509 		goto done;
6510 
6511 	error = got_object_resolve_symlinks(&link_target, in_repo_path,
6512 	    commit, repo);
6513 	if (error)
6514 		goto done;
6515 
6516 	error = open_blame_view(view, link_target ? link_target : in_repo_path,
6517 	    commit_id, repo);
6518 	if (error)
6519 		goto done;
6520 	if (worktree) {
6521 		/* Release work tree lock. */
6522 		got_worktree_close(worktree);
6523 		worktree = NULL;
6524 	}
6525 	error = view_loop(view);
6526 done:
6527 	free(repo_path);
6528 	free(in_repo_path);
6529 	free(link_target);
6530 	free(cwd);
6531 	free(commit_id);
6532 	if (commit)
6533 		got_object_commit_close(commit);
6534 	if (worktree)
6535 		got_worktree_close(worktree);
6536 	if (repo) {
6537 		const struct got_error *close_err = got_repo_close(repo);
6538 		if (error == NULL)
6539 			error = close_err;
6540 	}
6541 	if (pack_fds) {
6542 		const struct got_error *pack_err =
6543 		    got_repo_pack_fds_close(pack_fds);
6544 		if (error == NULL)
6545 			error = pack_err;
6546 	}
6547 	tog_free_refs();
6548 	return error;
6549 }
6550 
6551 static const struct got_error *
6552 draw_tree_entries(struct tog_view *view, const char *parent_path)
6553 {
6554 	struct tog_tree_view_state *s = &view->state.tree;
6555 	const struct got_error *err = NULL;
6556 	struct got_tree_entry *te;
6557 	wchar_t *wline;
6558 	char *index = NULL;
6559 	struct tog_color *tc;
6560 	int width, n, nentries, i = 1;
6561 	int limit = view->nlines;
6562 
6563 	s->ndisplayed = 0;
6564 	if (view_is_hsplit_top(view))
6565 		--limit;  /* border */
6566 
6567 	werase(view->window);
6568 
6569 	if (limit == 0)
6570 		return NULL;
6571 
6572 	err = format_line(&wline, &width, NULL, s->tree_label, 0, view->ncols,
6573 	    0, 0);
6574 	if (err)
6575 		return err;
6576 	if (view_needs_focus_indication(view))
6577 		wstandout(view->window);
6578 	tc = get_color(&s->colors, TOG_COLOR_COMMIT);
6579 	if (tc)
6580 		wattr_on(view->window, COLOR_PAIR(tc->colorpair), NULL);
6581 	waddwstr(view->window, wline);
6582 	free(wline);
6583 	wline = NULL;
6584 	while (width++ < view->ncols)
6585 		waddch(view->window, ' ');
6586 	if (tc)
6587 		wattr_off(view->window, COLOR_PAIR(tc->colorpair), NULL);
6588 	if (view_needs_focus_indication(view))
6589 		wstandend(view->window);
6590 	if (--limit <= 0)
6591 		return NULL;
6592 
6593 	i += s->selected;
6594 	if (s->first_displayed_entry) {
6595 		i += got_tree_entry_get_index(s->first_displayed_entry);
6596 		if (s->tree != s->root)
6597 			++i;  /* account for ".." entry */
6598 	}
6599 	nentries = got_object_tree_get_nentries(s->tree);
6600 	if (asprintf(&index, "[%d/%d] %s",
6601 	    i, nentries + (s->tree == s->root ? 0 : 1), parent_path) == -1)
6602 		return got_error_from_errno("asprintf");
6603 	err = format_line(&wline, &width, NULL, index, 0, view->ncols, 0, 0);
6604 	free(index);
6605 	if (err)
6606 		return err;
6607 	waddwstr(view->window, wline);
6608 	free(wline);
6609 	wline = NULL;
6610 	if (width < view->ncols - 1)
6611 		waddch(view->window, '\n');
6612 	if (--limit <= 0)
6613 		return NULL;
6614 	waddch(view->window, '\n');
6615 	if (--limit <= 0)
6616 		return NULL;
6617 
6618 	if (s->first_displayed_entry == NULL) {
6619 		te = got_object_tree_get_first_entry(s->tree);
6620 		if (s->selected == 0) {
6621 			if (view->focussed)
6622 				wstandout(view->window);
6623 			s->selected_entry = NULL;
6624 		}
6625 		waddstr(view->window, "  ..\n");	/* parent directory */
6626 		if (s->selected == 0 && view->focussed)
6627 			wstandend(view->window);
6628 		s->ndisplayed++;
6629 		if (--limit <= 0)
6630 			return NULL;
6631 		n = 1;
6632 	} else {
6633 		n = 0;
6634 		te = s->first_displayed_entry;
6635 	}
6636 
6637 	for (i = got_tree_entry_get_index(te); i < nentries; i++) {
6638 		char *line = NULL, *id_str = NULL, *link_target = NULL;
6639 		const char *modestr = "";
6640 		mode_t mode;
6641 
6642 		te = got_object_tree_get_entry(s->tree, i);
6643 		mode = got_tree_entry_get_mode(te);
6644 
6645 		if (s->show_ids) {
6646 			err = got_object_id_str(&id_str,
6647 			    got_tree_entry_get_id(te));
6648 			if (err)
6649 				return got_error_from_errno(
6650 				    "got_object_id_str");
6651 		}
6652 		if (got_object_tree_entry_is_submodule(te))
6653 			modestr = "$";
6654 		else if (S_ISLNK(mode)) {
6655 			int i;
6656 
6657 			err = got_tree_entry_get_symlink_target(&link_target,
6658 			    te, s->repo);
6659 			if (err) {
6660 				free(id_str);
6661 				return err;
6662 			}
6663 			for (i = 0; i < strlen(link_target); i++) {
6664 				if (!isprint((unsigned char)link_target[i]))
6665 					link_target[i] = '?';
6666 			}
6667 			modestr = "@";
6668 		}
6669 		else if (S_ISDIR(mode))
6670 			modestr = "/";
6671 		else if (mode & S_IXUSR)
6672 			modestr = "*";
6673 		if (asprintf(&line, "%s  %s%s%s%s", id_str ? id_str : "",
6674 		    got_tree_entry_get_name(te), modestr,
6675 		    link_target ? " -> ": "",
6676 		    link_target ? link_target : "") == -1) {
6677 			free(id_str);
6678 			free(link_target);
6679 			return got_error_from_errno("asprintf");
6680 		}
6681 		free(id_str);
6682 		free(link_target);
6683 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
6684 		    0, 0);
6685 		if (err) {
6686 			free(line);
6687 			break;
6688 		}
6689 		if (n == s->selected) {
6690 			if (view->focussed)
6691 				wstandout(view->window);
6692 			s->selected_entry = te;
6693 		}
6694 		tc = match_color(&s->colors, line);
6695 		if (tc)
6696 			wattr_on(view->window,
6697 			    COLOR_PAIR(tc->colorpair), NULL);
6698 		waddwstr(view->window, wline);
6699 		if (tc)
6700 			wattr_off(view->window,
6701 			    COLOR_PAIR(tc->colorpair), NULL);
6702 		if (width < view->ncols - 1)
6703 			waddch(view->window, '\n');
6704 		if (n == s->selected && view->focussed)
6705 			wstandend(view->window);
6706 		free(line);
6707 		free(wline);
6708 		wline = NULL;
6709 		n++;
6710 		s->ndisplayed++;
6711 		s->last_displayed_entry = te;
6712 		if (--limit <= 0)
6713 			break;
6714 	}
6715 
6716 	return err;
6717 }
6718 
6719 static void
6720 tree_scroll_up(struct tog_tree_view_state *s, int maxscroll)
6721 {
6722 	struct got_tree_entry *te;
6723 	int isroot = s->tree == s->root;
6724 	int i = 0;
6725 
6726 	if (s->first_displayed_entry == NULL)
6727 		return;
6728 
6729 	te = got_tree_entry_get_prev(s->tree, s->first_displayed_entry);
6730 	while (i++ < maxscroll) {
6731 		if (te == NULL) {
6732 			if (!isroot)
6733 				s->first_displayed_entry = NULL;
6734 			break;
6735 		}
6736 		s->first_displayed_entry = te;
6737 		te = got_tree_entry_get_prev(s->tree, te);
6738 	}
6739 }
6740 
6741 static const struct got_error *
6742 tree_scroll_down(struct tog_view *view, int maxscroll)
6743 {
6744 	struct tog_tree_view_state *s = &view->state.tree;
6745 	struct got_tree_entry *next, *last;
6746 	int n = 0;
6747 
6748 	if (s->first_displayed_entry)
6749 		next = got_tree_entry_get_next(s->tree,
6750 		    s->first_displayed_entry);
6751 	else
6752 		next = got_object_tree_get_first_entry(s->tree);
6753 
6754 	last = s->last_displayed_entry;
6755 	while (next && n++ < maxscroll) {
6756 		if (last) {
6757 			s->last_displayed_entry = last;
6758 			last = got_tree_entry_get_next(s->tree, last);
6759 		}
6760 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN && next)) {
6761 			s->first_displayed_entry = next;
6762 			next = got_tree_entry_get_next(s->tree, next);
6763 		}
6764 	}
6765 
6766 	return NULL;
6767 }
6768 
6769 static const struct got_error *
6770 tree_entry_path(char **path, struct tog_parent_trees *parents,
6771     struct got_tree_entry *te)
6772 {
6773 	const struct got_error *err = NULL;
6774 	struct tog_parent_tree *pt;
6775 	size_t len = 2; /* for leading slash and NUL */
6776 
6777 	TAILQ_FOREACH(pt, parents, entry)
6778 		len += strlen(got_tree_entry_get_name(pt->selected_entry))
6779 		    + 1 /* slash */;
6780 	if (te)
6781 		len += strlen(got_tree_entry_get_name(te));
6782 
6783 	*path = calloc(1, len);
6784 	if (path == NULL)
6785 		return got_error_from_errno("calloc");
6786 
6787 	(*path)[0] = '/';
6788 	pt = TAILQ_LAST(parents, tog_parent_trees);
6789 	while (pt) {
6790 		const char *name = got_tree_entry_get_name(pt->selected_entry);
6791 		if (strlcat(*path, name, len) >= len) {
6792 			err = got_error(GOT_ERR_NO_SPACE);
6793 			goto done;
6794 		}
6795 		if (strlcat(*path, "/", len) >= len) {
6796 			err = got_error(GOT_ERR_NO_SPACE);
6797 			goto done;
6798 		}
6799 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
6800 	}
6801 	if (te) {
6802 		if (strlcat(*path, got_tree_entry_get_name(te), len) >= len) {
6803 			err = got_error(GOT_ERR_NO_SPACE);
6804 			goto done;
6805 		}
6806 	}
6807 done:
6808 	if (err) {
6809 		free(*path);
6810 		*path = NULL;
6811 	}
6812 	return err;
6813 }
6814 
6815 static const struct got_error *
6816 blame_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6817     struct got_tree_entry *te, struct tog_parent_trees *parents,
6818     struct got_object_id *commit_id, struct got_repository *repo)
6819 {
6820 	const struct got_error *err = NULL;
6821 	char *path;
6822 	struct tog_view *blame_view;
6823 
6824 	*new_view = NULL;
6825 
6826 	err = tree_entry_path(&path, parents, te);
6827 	if (err)
6828 		return err;
6829 
6830 	blame_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_BLAME);
6831 	if (blame_view == NULL) {
6832 		err = got_error_from_errno("view_open");
6833 		goto done;
6834 	}
6835 
6836 	err = open_blame_view(blame_view, path, commit_id, repo);
6837 	if (err) {
6838 		if (err->code == GOT_ERR_CANCELLED)
6839 			err = NULL;
6840 		view_close(blame_view);
6841 	} else
6842 		*new_view = blame_view;
6843 done:
6844 	free(path);
6845 	return err;
6846 }
6847 
6848 static const struct got_error *
6849 log_selected_tree_entry(struct tog_view **new_view, int begin_y, int begin_x,
6850     struct tog_tree_view_state *s)
6851 {
6852 	struct tog_view *log_view;
6853 	const struct got_error *err = NULL;
6854 	char *path;
6855 
6856 	*new_view = NULL;
6857 
6858 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
6859 	if (log_view == NULL)
6860 		return got_error_from_errno("view_open");
6861 
6862 	err = tree_entry_path(&path, &s->parents, s->selected_entry);
6863 	if (err)
6864 		return err;
6865 
6866 	err = open_log_view(log_view, s->commit_id, s->repo, s->head_ref_name,
6867 	    path, 0);
6868 	if (err)
6869 		view_close(log_view);
6870 	else
6871 		*new_view = log_view;
6872 	free(path);
6873 	return err;
6874 }
6875 
6876 static const struct got_error *
6877 open_tree_view(struct tog_view *view, struct got_object_id *commit_id,
6878     const char *head_ref_name, struct got_repository *repo)
6879 {
6880 	const struct got_error *err = NULL;
6881 	char *commit_id_str = NULL;
6882 	struct tog_tree_view_state *s = &view->state.tree;
6883 	struct got_commit_object *commit = NULL;
6884 
6885 	TAILQ_INIT(&s->parents);
6886 	STAILQ_INIT(&s->colors);
6887 
6888 	s->commit_id = got_object_id_dup(commit_id);
6889 	if (s->commit_id == NULL)
6890 		return got_error_from_errno("got_object_id_dup");
6891 
6892 	err = got_object_open_as_commit(&commit, repo, commit_id);
6893 	if (err)
6894 		goto done;
6895 
6896 	/*
6897 	 * The root is opened here and will be closed when the view is closed.
6898 	 * Any visited subtrees and their path-wise parents are opened and
6899 	 * closed on demand.
6900 	 */
6901 	err = got_object_open_as_tree(&s->root, repo,
6902 	    got_object_commit_get_tree_id(commit));
6903 	if (err)
6904 		goto done;
6905 	s->tree = s->root;
6906 
6907 	err = got_object_id_str(&commit_id_str, commit_id);
6908 	if (err != NULL)
6909 		goto done;
6910 
6911 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
6912 		err = got_error_from_errno("asprintf");
6913 		goto done;
6914 	}
6915 
6916 	s->first_displayed_entry = got_object_tree_get_entry(s->tree, 0);
6917 	s->selected_entry = got_object_tree_get_entry(s->tree, 0);
6918 	if (head_ref_name) {
6919 		s->head_ref_name = strdup(head_ref_name);
6920 		if (s->head_ref_name == NULL) {
6921 			err = got_error_from_errno("strdup");
6922 			goto done;
6923 		}
6924 	}
6925 	s->repo = repo;
6926 
6927 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
6928 		err = add_color(&s->colors, "\\$$",
6929 		    TOG_COLOR_TREE_SUBMODULE,
6930 		    get_color_value("TOG_COLOR_TREE_SUBMODULE"));
6931 		if (err)
6932 			goto done;
6933 		err = add_color(&s->colors, "@$", TOG_COLOR_TREE_SYMLINK,
6934 		    get_color_value("TOG_COLOR_TREE_SYMLINK"));
6935 		if (err)
6936 			goto done;
6937 		err = add_color(&s->colors, "/$",
6938 		    TOG_COLOR_TREE_DIRECTORY,
6939 		    get_color_value("TOG_COLOR_TREE_DIRECTORY"));
6940 		if (err)
6941 			goto done;
6942 
6943 		err = add_color(&s->colors, "\\*$",
6944 		    TOG_COLOR_TREE_EXECUTABLE,
6945 		    get_color_value("TOG_COLOR_TREE_EXECUTABLE"));
6946 		if (err)
6947 			goto done;
6948 
6949 		err = add_color(&s->colors, "^$", TOG_COLOR_COMMIT,
6950 		    get_color_value("TOG_COLOR_COMMIT"));
6951 		if (err)
6952 			goto done;
6953 	}
6954 
6955 	view->show = show_tree_view;
6956 	view->input = input_tree_view;
6957 	view->close = close_tree_view;
6958 	view->search_start = search_start_tree_view;
6959 	view->search_next = search_next_tree_view;
6960 done:
6961 	free(commit_id_str);
6962 	if (commit)
6963 		got_object_commit_close(commit);
6964 	if (err)
6965 		close_tree_view(view);
6966 	return err;
6967 }
6968 
6969 static const struct got_error *
6970 close_tree_view(struct tog_view *view)
6971 {
6972 	struct tog_tree_view_state *s = &view->state.tree;
6973 
6974 	free_colors(&s->colors);
6975 	free(s->tree_label);
6976 	s->tree_label = NULL;
6977 	free(s->commit_id);
6978 	s->commit_id = NULL;
6979 	free(s->head_ref_name);
6980 	s->head_ref_name = NULL;
6981 	while (!TAILQ_EMPTY(&s->parents)) {
6982 		struct tog_parent_tree *parent;
6983 		parent = TAILQ_FIRST(&s->parents);
6984 		TAILQ_REMOVE(&s->parents, parent, entry);
6985 		if (parent->tree != s->root)
6986 			got_object_tree_close(parent->tree);
6987 		free(parent);
6988 
6989 	}
6990 	if (s->tree != NULL && s->tree != s->root)
6991 		got_object_tree_close(s->tree);
6992 	if (s->root)
6993 		got_object_tree_close(s->root);
6994 	return NULL;
6995 }
6996 
6997 static const struct got_error *
6998 search_start_tree_view(struct tog_view *view)
6999 {
7000 	struct tog_tree_view_state *s = &view->state.tree;
7001 
7002 	s->matched_entry = NULL;
7003 	return NULL;
7004 }
7005 
7006 static int
7007 match_tree_entry(struct got_tree_entry *te, regex_t *regex)
7008 {
7009 	regmatch_t regmatch;
7010 
7011 	return regexec(regex, got_tree_entry_get_name(te), 1, &regmatch,
7012 	    0) == 0;
7013 }
7014 
7015 static const struct got_error *
7016 search_next_tree_view(struct tog_view *view)
7017 {
7018 	struct tog_tree_view_state *s = &view->state.tree;
7019 	struct got_tree_entry *te = NULL;
7020 
7021 	if (!view->searching) {
7022 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7023 		return NULL;
7024 	}
7025 
7026 	if (s->matched_entry) {
7027 		if (view->searching == TOG_SEARCH_FORWARD) {
7028 			if (s->selected_entry)
7029 				te = got_tree_entry_get_next(s->tree,
7030 				    s->selected_entry);
7031 			else
7032 				te = got_object_tree_get_first_entry(s->tree);
7033 		} else {
7034 			if (s->selected_entry == NULL)
7035 				te = got_object_tree_get_last_entry(s->tree);
7036 			else
7037 				te = got_tree_entry_get_prev(s->tree,
7038 				    s->selected_entry);
7039 		}
7040 	} else {
7041 		if (s->selected_entry)
7042 			te = s->selected_entry;
7043 		else if (view->searching == TOG_SEARCH_FORWARD)
7044 			te = got_object_tree_get_first_entry(s->tree);
7045 		else
7046 			te = got_object_tree_get_last_entry(s->tree);
7047 	}
7048 
7049 	while (1) {
7050 		if (te == NULL) {
7051 			if (s->matched_entry == NULL) {
7052 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7053 				return NULL;
7054 			}
7055 			if (view->searching == TOG_SEARCH_FORWARD)
7056 				te = got_object_tree_get_first_entry(s->tree);
7057 			else
7058 				te = got_object_tree_get_last_entry(s->tree);
7059 		}
7060 
7061 		if (match_tree_entry(te, &view->regex)) {
7062 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7063 			s->matched_entry = te;
7064 			break;
7065 		}
7066 
7067 		if (view->searching == TOG_SEARCH_FORWARD)
7068 			te = got_tree_entry_get_next(s->tree, te);
7069 		else
7070 			te = got_tree_entry_get_prev(s->tree, te);
7071 	}
7072 
7073 	if (s->matched_entry) {
7074 		s->first_displayed_entry = s->matched_entry;
7075 		s->selected = 0;
7076 	}
7077 
7078 	return NULL;
7079 }
7080 
7081 static const struct got_error *
7082 show_tree_view(struct tog_view *view)
7083 {
7084 	const struct got_error *err = NULL;
7085 	struct tog_tree_view_state *s = &view->state.tree;
7086 	char *parent_path;
7087 
7088 	err = tree_entry_path(&parent_path, &s->parents, NULL);
7089 	if (err)
7090 		return err;
7091 
7092 	err = draw_tree_entries(view, parent_path);
7093 	free(parent_path);
7094 
7095 	view_border(view);
7096 	return err;
7097 }
7098 
7099 static const struct got_error *
7100 tree_goto_line(struct tog_view *view, int nlines)
7101 {
7102 	const struct got_error		 *err = NULL;
7103 	struct tog_tree_view_state	 *s = &view->state.tree;
7104 	struct got_tree_entry		**fte, **lte, **ste;
7105 	int				  g, last, first = 1, i = 1;
7106 	int				  root = s->tree == s->root;
7107 	int				  off = root ? 1 : 2;
7108 
7109 	g = view->gline;
7110 	view->gline = 0;
7111 
7112 	if (g == 0)
7113 		g = 1;
7114 	else if (g > got_object_tree_get_nentries(s->tree))
7115 		g = got_object_tree_get_nentries(s->tree) + (root ? 0 : 1);
7116 
7117 	fte = &s->first_displayed_entry;
7118 	lte = &s->last_displayed_entry;
7119 	ste = &s->selected_entry;
7120 
7121 	if (*fte != NULL) {
7122 		first = got_tree_entry_get_index(*fte);
7123 		first += off;  /* account for ".." */
7124 	}
7125 	last = got_tree_entry_get_index(*lte);
7126 	last += off;
7127 
7128 	if (g >= first && g <= last && g - first < nlines) {
7129 		s->selected = g - first;
7130 		return NULL;	/* gline is on the current page */
7131 	}
7132 
7133 	if (*ste != NULL) {
7134 		i = got_tree_entry_get_index(*ste);
7135 		i += off;
7136 	}
7137 
7138 	if (i < g) {
7139 		err = tree_scroll_down(view, g - i);
7140 		if (err)
7141 			return err;
7142 		if (got_tree_entry_get_index(*lte) >=
7143 		    got_object_tree_get_nentries(s->tree) - 1 &&
7144 		    first + s->selected < g &&
7145 		    s->selected < s->ndisplayed - 1) {
7146 			first = got_tree_entry_get_index(*fte);
7147 			first += off;
7148 			s->selected = g - first;
7149 		}
7150 	} else if (i > g)
7151 		tree_scroll_up(s, i - g);
7152 
7153 	if (g < nlines &&
7154 	    (*fte == NULL || (root && !got_tree_entry_get_index(*fte))))
7155 		s->selected = g - 1;
7156 
7157 	return NULL;
7158 }
7159 
7160 static const struct got_error *
7161 input_tree_view(struct tog_view **new_view, struct tog_view *view, int ch)
7162 {
7163 	const struct got_error *err = NULL;
7164 	struct tog_tree_view_state *s = &view->state.tree;
7165 	struct got_tree_entry *te;
7166 	int n, nscroll = view->nlines - 3;
7167 
7168 	if (view->gline)
7169 		return tree_goto_line(view, nscroll);
7170 
7171 	switch (ch) {
7172 	case 'i':
7173 		s->show_ids = !s->show_ids;
7174 		view->count = 0;
7175 		break;
7176 	case 'L':
7177 		view->count = 0;
7178 		if (!s->selected_entry)
7179 			break;
7180 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
7181 		break;
7182 	case 'R':
7183 		view->count = 0;
7184 		err = view_request_new(new_view, view, TOG_VIEW_REF);
7185 		break;
7186 	case 'g':
7187 	case KEY_HOME:
7188 		s->selected = 0;
7189 		view->count = 0;
7190 		if (s->tree == s->root)
7191 			s->first_displayed_entry =
7192 			    got_object_tree_get_first_entry(s->tree);
7193 		else
7194 			s->first_displayed_entry = NULL;
7195 		break;
7196 	case 'G':
7197 	case KEY_END: {
7198 		int eos = view->nlines - 3;
7199 
7200 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
7201 			--eos;  /* border */
7202 		s->selected = 0;
7203 		view->count = 0;
7204 		te = got_object_tree_get_last_entry(s->tree);
7205 		for (n = 0; n < eos; n++) {
7206 			if (te == NULL) {
7207 				if (s->tree != s->root) {
7208 					s->first_displayed_entry = NULL;
7209 					n++;
7210 				}
7211 				break;
7212 			}
7213 			s->first_displayed_entry = te;
7214 			te = got_tree_entry_get_prev(s->tree, te);
7215 		}
7216 		if (n > 0)
7217 			s->selected = n - 1;
7218 		break;
7219 	}
7220 	case 'k':
7221 	case KEY_UP:
7222 	case CTRL('p'):
7223 		if (s->selected > 0) {
7224 			s->selected--;
7225 			break;
7226 		}
7227 		tree_scroll_up(s, 1);
7228 		if (s->selected_entry == NULL ||
7229 		    (s->tree == s->root && s->selected_entry ==
7230 		     got_object_tree_get_first_entry(s->tree)))
7231 			view->count = 0;
7232 		break;
7233 	case CTRL('u'):
7234 	case 'u':
7235 		nscroll /= 2;
7236 		/* FALL THROUGH */
7237 	case KEY_PPAGE:
7238 	case CTRL('b'):
7239 	case 'b':
7240 		if (s->tree == s->root) {
7241 			if (got_object_tree_get_first_entry(s->tree) ==
7242 			    s->first_displayed_entry)
7243 				s->selected -= MIN(s->selected, nscroll);
7244 		} else {
7245 			if (s->first_displayed_entry == NULL)
7246 				s->selected -= MIN(s->selected, nscroll);
7247 		}
7248 		tree_scroll_up(s, MAX(0, nscroll));
7249 		if (s->selected_entry == NULL ||
7250 		    (s->tree == s->root && s->selected_entry ==
7251 		     got_object_tree_get_first_entry(s->tree)))
7252 			view->count = 0;
7253 		break;
7254 	case 'j':
7255 	case KEY_DOWN:
7256 	case CTRL('n'):
7257 		if (s->selected < s->ndisplayed - 1) {
7258 			s->selected++;
7259 			break;
7260 		}
7261 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7262 		    == NULL) {
7263 			/* can't scroll any further */
7264 			view->count = 0;
7265 			break;
7266 		}
7267 		tree_scroll_down(view, 1);
7268 		break;
7269 	case CTRL('d'):
7270 	case 'd':
7271 		nscroll /= 2;
7272 		/* FALL THROUGH */
7273 	case KEY_NPAGE:
7274 	case CTRL('f'):
7275 	case 'f':
7276 	case ' ':
7277 		if (got_tree_entry_get_next(s->tree, s->last_displayed_entry)
7278 		    == NULL) {
7279 			/* can't scroll any further; move cursor down */
7280 			if (s->selected < s->ndisplayed - 1)
7281 				s->selected += MIN(nscroll,
7282 				    s->ndisplayed - s->selected - 1);
7283 			else
7284 				view->count = 0;
7285 			break;
7286 		}
7287 		tree_scroll_down(view, nscroll);
7288 		break;
7289 	case KEY_ENTER:
7290 	case '\r':
7291 	case KEY_BACKSPACE:
7292 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
7293 			struct tog_parent_tree *parent;
7294 			/* user selected '..' */
7295 			if (s->tree == s->root) {
7296 				view->count = 0;
7297 				break;
7298 			}
7299 			parent = TAILQ_FIRST(&s->parents);
7300 			TAILQ_REMOVE(&s->parents, parent,
7301 			    entry);
7302 			got_object_tree_close(s->tree);
7303 			s->tree = parent->tree;
7304 			s->first_displayed_entry =
7305 			    parent->first_displayed_entry;
7306 			s->selected_entry =
7307 			    parent->selected_entry;
7308 			s->selected = parent->selected;
7309 			if (s->selected > view->nlines - 3) {
7310 				err = offset_selection_down(view);
7311 				if (err)
7312 					break;
7313 			}
7314 			free(parent);
7315 		} else if (S_ISDIR(got_tree_entry_get_mode(
7316 		    s->selected_entry))) {
7317 			struct got_tree_object *subtree;
7318 			view->count = 0;
7319 			err = got_object_open_as_tree(&subtree, s->repo,
7320 			    got_tree_entry_get_id(s->selected_entry));
7321 			if (err)
7322 				break;
7323 			err = tree_view_visit_subtree(s, subtree);
7324 			if (err) {
7325 				got_object_tree_close(subtree);
7326 				break;
7327 			}
7328 		} else if (S_ISREG(got_tree_entry_get_mode(s->selected_entry)))
7329 			err = view_request_new(new_view, view, TOG_VIEW_BLAME);
7330 		break;
7331 	case KEY_RESIZE:
7332 		if (view->nlines >= 4 && s->selected >= view->nlines - 3)
7333 			s->selected = view->nlines - 4;
7334 		view->count = 0;
7335 		break;
7336 	default:
7337 		view->count = 0;
7338 		break;
7339 	}
7340 
7341 	return err;
7342 }
7343 
7344 __dead static void
7345 usage_tree(void)
7346 {
7347 	endwin();
7348 	fprintf(stderr,
7349 	    "usage: %s tree [-c commit] [-r repository-path] [path]\n",
7350 	    getprogname());
7351 	exit(1);
7352 }
7353 
7354 static const struct got_error *
7355 cmd_tree(int argc, char *argv[])
7356 {
7357 	const struct got_error *error;
7358 	struct got_repository *repo = NULL;
7359 	struct got_worktree *worktree = NULL;
7360 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
7361 	struct got_object_id *commit_id = NULL;
7362 	struct got_commit_object *commit = NULL;
7363 	const char *commit_id_arg = NULL;
7364 	char *label = NULL;
7365 	struct got_reference *ref = NULL;
7366 	const char *head_ref_name = NULL;
7367 	int ch;
7368 	struct tog_view *view;
7369 	int *pack_fds = NULL;
7370 
7371 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
7372 		switch (ch) {
7373 		case 'c':
7374 			commit_id_arg = optarg;
7375 			break;
7376 		case 'r':
7377 			repo_path = realpath(optarg, NULL);
7378 			if (repo_path == NULL)
7379 				return got_error_from_errno2("realpath",
7380 				    optarg);
7381 			break;
7382 		default:
7383 			usage_tree();
7384 			/* NOTREACHED */
7385 		}
7386 	}
7387 
7388 	argc -= optind;
7389 	argv += optind;
7390 
7391 	if (argc > 1)
7392 		usage_tree();
7393 
7394 	error = got_repo_pack_fds_open(&pack_fds);
7395 	if (error != NULL)
7396 		goto done;
7397 
7398 	if (repo_path == NULL) {
7399 		cwd = getcwd(NULL, 0);
7400 		if (cwd == NULL)
7401 			return got_error_from_errno("getcwd");
7402 		error = got_worktree_open(&worktree, cwd);
7403 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
7404 			goto done;
7405 		if (worktree)
7406 			repo_path =
7407 			    strdup(got_worktree_get_repo_path(worktree));
7408 		else
7409 			repo_path = strdup(cwd);
7410 		if (repo_path == NULL) {
7411 			error = got_error_from_errno("strdup");
7412 			goto done;
7413 		}
7414 	}
7415 
7416 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
7417 	if (error != NULL)
7418 		goto done;
7419 
7420 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
7421 	    repo, worktree);
7422 	if (error)
7423 		goto done;
7424 
7425 	init_curses();
7426 
7427 	error = apply_unveil(got_repo_get_path(repo), NULL);
7428 	if (error)
7429 		goto done;
7430 
7431 	error = tog_load_refs(repo, 0);
7432 	if (error)
7433 		goto done;
7434 
7435 	if (commit_id_arg == NULL) {
7436 		error = got_repo_match_object_id(&commit_id, &label,
7437 		    worktree ? got_worktree_get_head_ref_name(worktree) :
7438 		    GOT_REF_HEAD, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7439 		if (error)
7440 			goto done;
7441 		head_ref_name = label;
7442 	} else {
7443 		error = got_ref_open(&ref, repo, commit_id_arg, 0);
7444 		if (error == NULL)
7445 			head_ref_name = got_ref_get_name(ref);
7446 		else if (error->code != GOT_ERR_NOT_REF)
7447 			goto done;
7448 		error = got_repo_match_object_id(&commit_id, NULL,
7449 		    commit_id_arg, GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
7450 		if (error)
7451 			goto done;
7452 	}
7453 
7454 	error = got_object_open_as_commit(&commit, repo, commit_id);
7455 	if (error)
7456 		goto done;
7457 
7458 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
7459 	if (view == NULL) {
7460 		error = got_error_from_errno("view_open");
7461 		goto done;
7462 	}
7463 	error = open_tree_view(view, commit_id, head_ref_name, repo);
7464 	if (error)
7465 		goto done;
7466 	if (!got_path_is_root_dir(in_repo_path)) {
7467 		error = tree_view_walk_path(&view->state.tree, commit,
7468 		    in_repo_path);
7469 		if (error)
7470 			goto done;
7471 	}
7472 
7473 	if (worktree) {
7474 		/* Release work tree lock. */
7475 		got_worktree_close(worktree);
7476 		worktree = NULL;
7477 	}
7478 	error = view_loop(view);
7479 done:
7480 	free(repo_path);
7481 	free(cwd);
7482 	free(commit_id);
7483 	free(label);
7484 	if (ref)
7485 		got_ref_close(ref);
7486 	if (repo) {
7487 		const struct got_error *close_err = got_repo_close(repo);
7488 		if (error == NULL)
7489 			error = close_err;
7490 	}
7491 	if (pack_fds) {
7492 		const struct got_error *pack_err =
7493 		    got_repo_pack_fds_close(pack_fds);
7494 		if (error == NULL)
7495 			error = pack_err;
7496 	}
7497 	tog_free_refs();
7498 	return error;
7499 }
7500 
7501 static const struct got_error *
7502 ref_view_load_refs(struct tog_ref_view_state *s)
7503 {
7504 	struct got_reflist_entry *sre;
7505 	struct tog_reflist_entry *re;
7506 
7507 	s->nrefs = 0;
7508 	TAILQ_FOREACH(sre, &tog_refs, entry) {
7509 		if (strncmp(got_ref_get_name(sre->ref),
7510 		    "refs/got/", 9) == 0 &&
7511 		    strncmp(got_ref_get_name(sre->ref),
7512 		    "refs/got/backup/", 16) != 0)
7513 			continue;
7514 
7515 		re = malloc(sizeof(*re));
7516 		if (re == NULL)
7517 			return got_error_from_errno("malloc");
7518 
7519 		re->ref = got_ref_dup(sre->ref);
7520 		if (re->ref == NULL)
7521 			return got_error_from_errno("got_ref_dup");
7522 		re->idx = s->nrefs++;
7523 		TAILQ_INSERT_TAIL(&s->refs, re, entry);
7524 	}
7525 
7526 	s->first_displayed_entry = TAILQ_FIRST(&s->refs);
7527 	return NULL;
7528 }
7529 
7530 static void
7531 ref_view_free_refs(struct tog_ref_view_state *s)
7532 {
7533 	struct tog_reflist_entry *re;
7534 
7535 	while (!TAILQ_EMPTY(&s->refs)) {
7536 		re = TAILQ_FIRST(&s->refs);
7537 		TAILQ_REMOVE(&s->refs, re, entry);
7538 		got_ref_close(re->ref);
7539 		free(re);
7540 	}
7541 }
7542 
7543 static const struct got_error *
7544 open_ref_view(struct tog_view *view, struct got_repository *repo)
7545 {
7546 	const struct got_error *err = NULL;
7547 	struct tog_ref_view_state *s = &view->state.ref;
7548 
7549 	s->selected_entry = 0;
7550 	s->repo = repo;
7551 
7552 	TAILQ_INIT(&s->refs);
7553 	STAILQ_INIT(&s->colors);
7554 
7555 	err = ref_view_load_refs(s);
7556 	if (err)
7557 		return err;
7558 
7559 	if (has_colors() && getenv("TOG_COLORS") != NULL) {
7560 		err = add_color(&s->colors, "^refs/heads/",
7561 		    TOG_COLOR_REFS_HEADS,
7562 		    get_color_value("TOG_COLOR_REFS_HEADS"));
7563 		if (err)
7564 			goto done;
7565 
7566 		err = add_color(&s->colors, "^refs/tags/",
7567 		    TOG_COLOR_REFS_TAGS,
7568 		    get_color_value("TOG_COLOR_REFS_TAGS"));
7569 		if (err)
7570 			goto done;
7571 
7572 		err = add_color(&s->colors, "^refs/remotes/",
7573 		    TOG_COLOR_REFS_REMOTES,
7574 		    get_color_value("TOG_COLOR_REFS_REMOTES"));
7575 		if (err)
7576 			goto done;
7577 
7578 		err = add_color(&s->colors, "^refs/got/backup/",
7579 		    TOG_COLOR_REFS_BACKUP,
7580 		    get_color_value("TOG_COLOR_REFS_BACKUP"));
7581 		if (err)
7582 			goto done;
7583 	}
7584 
7585 	view->show = show_ref_view;
7586 	view->input = input_ref_view;
7587 	view->close = close_ref_view;
7588 	view->search_start = search_start_ref_view;
7589 	view->search_next = search_next_ref_view;
7590 done:
7591 	if (err)
7592 		free_colors(&s->colors);
7593 	return err;
7594 }
7595 
7596 static const struct got_error *
7597 close_ref_view(struct tog_view *view)
7598 {
7599 	struct tog_ref_view_state *s = &view->state.ref;
7600 
7601 	ref_view_free_refs(s);
7602 	free_colors(&s->colors);
7603 
7604 	return NULL;
7605 }
7606 
7607 static const struct got_error *
7608 resolve_reflist_entry(struct got_object_id **commit_id,
7609     struct tog_reflist_entry *re, struct got_repository *repo)
7610 {
7611 	const struct got_error *err = NULL;
7612 	struct got_object_id *obj_id;
7613 	struct got_tag_object *tag = NULL;
7614 	int obj_type;
7615 
7616 	*commit_id = NULL;
7617 
7618 	err = got_ref_resolve(&obj_id, repo, re->ref);
7619 	if (err)
7620 		return err;
7621 
7622 	err = got_object_get_type(&obj_type, repo, obj_id);
7623 	if (err)
7624 		goto done;
7625 
7626 	switch (obj_type) {
7627 	case GOT_OBJ_TYPE_COMMIT:
7628 		*commit_id = obj_id;
7629 		break;
7630 	case GOT_OBJ_TYPE_TAG:
7631 		err = got_object_open_as_tag(&tag, repo, obj_id);
7632 		if (err)
7633 			goto done;
7634 		free(obj_id);
7635 		err = got_object_get_type(&obj_type, repo,
7636 		    got_object_tag_get_object_id(tag));
7637 		if (err)
7638 			goto done;
7639 		if (obj_type != GOT_OBJ_TYPE_COMMIT) {
7640 			err = got_error(GOT_ERR_OBJ_TYPE);
7641 			goto done;
7642 		}
7643 		*commit_id = got_object_id_dup(
7644 		    got_object_tag_get_object_id(tag));
7645 		if (*commit_id == NULL) {
7646 			err = got_error_from_errno("got_object_id_dup");
7647 			goto done;
7648 		}
7649 		break;
7650 	default:
7651 		err = got_error(GOT_ERR_OBJ_TYPE);
7652 		break;
7653 	}
7654 
7655 done:
7656 	if (tag)
7657 		got_object_tag_close(tag);
7658 	if (err) {
7659 		free(*commit_id);
7660 		*commit_id = NULL;
7661 	}
7662 	return err;
7663 }
7664 
7665 static const struct got_error *
7666 log_ref_entry(struct tog_view **new_view, int begin_y, int begin_x,
7667     struct tog_reflist_entry *re, struct got_repository *repo)
7668 {
7669 	struct tog_view *log_view;
7670 	const struct got_error *err = NULL;
7671 	struct got_object_id *commit_id = NULL;
7672 
7673 	*new_view = NULL;
7674 
7675 	err = resolve_reflist_entry(&commit_id, re, repo);
7676 	if (err) {
7677 		if (err->code != GOT_ERR_OBJ_TYPE)
7678 			return err;
7679 		else
7680 			return NULL;
7681 	}
7682 
7683 	log_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_LOG);
7684 	if (log_view == NULL) {
7685 		err = got_error_from_errno("view_open");
7686 		goto done;
7687 	}
7688 
7689 	err = open_log_view(log_view, commit_id, repo,
7690 	    got_ref_get_name(re->ref), "", 0);
7691 done:
7692 	if (err)
7693 		view_close(log_view);
7694 	else
7695 		*new_view = log_view;
7696 	free(commit_id);
7697 	return err;
7698 }
7699 
7700 static void
7701 ref_scroll_up(struct tog_ref_view_state *s, int maxscroll)
7702 {
7703 	struct tog_reflist_entry *re;
7704 	int i = 0;
7705 
7706 	if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
7707 		return;
7708 
7709 	re = TAILQ_PREV(s->first_displayed_entry, tog_reflist_head, entry);
7710 	while (i++ < maxscroll) {
7711 		if (re == NULL)
7712 			break;
7713 		s->first_displayed_entry = re;
7714 		re = TAILQ_PREV(re, tog_reflist_head, entry);
7715 	}
7716 }
7717 
7718 static const struct got_error *
7719 ref_scroll_down(struct tog_view *view, int maxscroll)
7720 {
7721 	struct tog_ref_view_state *s = &view->state.ref;
7722 	struct tog_reflist_entry *next, *last;
7723 	int n = 0;
7724 
7725 	if (s->first_displayed_entry)
7726 		next = TAILQ_NEXT(s->first_displayed_entry, entry);
7727 	else
7728 		next = TAILQ_FIRST(&s->refs);
7729 
7730 	last = s->last_displayed_entry;
7731 	while (next && n++ < maxscroll) {
7732 		if (last) {
7733 			s->last_displayed_entry = last;
7734 			last = TAILQ_NEXT(last, entry);
7735 		}
7736 		if (last || (view->mode == TOG_VIEW_SPLIT_HRZN)) {
7737 			s->first_displayed_entry = next;
7738 			next = TAILQ_NEXT(next, entry);
7739 		}
7740 	}
7741 
7742 	return NULL;
7743 }
7744 
7745 static const struct got_error *
7746 search_start_ref_view(struct tog_view *view)
7747 {
7748 	struct tog_ref_view_state *s = &view->state.ref;
7749 
7750 	s->matched_entry = NULL;
7751 	return NULL;
7752 }
7753 
7754 static int
7755 match_reflist_entry(struct tog_reflist_entry *re, regex_t *regex)
7756 {
7757 	regmatch_t regmatch;
7758 
7759 	return regexec(regex, got_ref_get_name(re->ref), 1, &regmatch,
7760 	    0) == 0;
7761 }
7762 
7763 static const struct got_error *
7764 search_next_ref_view(struct tog_view *view)
7765 {
7766 	struct tog_ref_view_state *s = &view->state.ref;
7767 	struct tog_reflist_entry *re = NULL;
7768 
7769 	if (!view->searching) {
7770 		view->search_next_done = TOG_SEARCH_HAVE_MORE;
7771 		return NULL;
7772 	}
7773 
7774 	if (s->matched_entry) {
7775 		if (view->searching == TOG_SEARCH_FORWARD) {
7776 			if (s->selected_entry)
7777 				re = TAILQ_NEXT(s->selected_entry, entry);
7778 			else
7779 				re = TAILQ_PREV(s->selected_entry,
7780 				    tog_reflist_head, entry);
7781 		} else {
7782 			if (s->selected_entry == NULL)
7783 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7784 			else
7785 				re = TAILQ_PREV(s->selected_entry,
7786 				    tog_reflist_head, entry);
7787 		}
7788 	} else {
7789 		if (s->selected_entry)
7790 			re = s->selected_entry;
7791 		else if (view->searching == TOG_SEARCH_FORWARD)
7792 			re = TAILQ_FIRST(&s->refs);
7793 		else
7794 			re = TAILQ_LAST(&s->refs, tog_reflist_head);
7795 	}
7796 
7797 	while (1) {
7798 		if (re == NULL) {
7799 			if (s->matched_entry == NULL) {
7800 				view->search_next_done = TOG_SEARCH_HAVE_MORE;
7801 				return NULL;
7802 			}
7803 			if (view->searching == TOG_SEARCH_FORWARD)
7804 				re = TAILQ_FIRST(&s->refs);
7805 			else
7806 				re = TAILQ_LAST(&s->refs, tog_reflist_head);
7807 		}
7808 
7809 		if (match_reflist_entry(re, &view->regex)) {
7810 			view->search_next_done = TOG_SEARCH_HAVE_MORE;
7811 			s->matched_entry = re;
7812 			break;
7813 		}
7814 
7815 		if (view->searching == TOG_SEARCH_FORWARD)
7816 			re = TAILQ_NEXT(re, entry);
7817 		else
7818 			re = TAILQ_PREV(re, tog_reflist_head, entry);
7819 	}
7820 
7821 	if (s->matched_entry) {
7822 		s->first_displayed_entry = s->matched_entry;
7823 		s->selected = 0;
7824 	}
7825 
7826 	return NULL;
7827 }
7828 
7829 static const struct got_error *
7830 show_ref_view(struct tog_view *view)
7831 {
7832 	const struct got_error *err = NULL;
7833 	struct tog_ref_view_state *s = &view->state.ref;
7834 	struct tog_reflist_entry *re;
7835 	char *line = NULL;
7836 	wchar_t *wline;
7837 	struct tog_color *tc;
7838 	int width, n;
7839 	int limit = view->nlines;
7840 
7841 	werase(view->window);
7842 
7843 	s->ndisplayed = 0;
7844 	if (view_is_hsplit_top(view))
7845 		--limit;  /* border */
7846 
7847 	if (limit == 0)
7848 		return NULL;
7849 
7850 	re = s->first_displayed_entry;
7851 
7852 	if (asprintf(&line, "references [%d/%d]", re->idx + s->selected + 1,
7853 	    s->nrefs) == -1)
7854 		return got_error_from_errno("asprintf");
7855 
7856 	err = format_line(&wline, &width, NULL, line, 0, view->ncols, 0, 0);
7857 	if (err) {
7858 		free(line);
7859 		return err;
7860 	}
7861 	if (view_needs_focus_indication(view))
7862 		wstandout(view->window);
7863 	waddwstr(view->window, wline);
7864 	while (width++ < view->ncols)
7865 		waddch(view->window, ' ');
7866 	if (view_needs_focus_indication(view))
7867 		wstandend(view->window);
7868 	free(wline);
7869 	wline = NULL;
7870 	free(line);
7871 	line = NULL;
7872 	if (--limit <= 0)
7873 		return NULL;
7874 
7875 	n = 0;
7876 	while (re && limit > 0) {
7877 		char *line = NULL;
7878 		char ymd[13];  /* YYYY-MM-DD + "  " + NUL */
7879 
7880 		if (s->show_date) {
7881 			struct got_commit_object *ci;
7882 			struct got_tag_object *tag;
7883 			struct got_object_id *id;
7884 			struct tm tm;
7885 			time_t t;
7886 
7887 			err = got_ref_resolve(&id, s->repo, re->ref);
7888 			if (err)
7889 				return err;
7890 			err = got_object_open_as_tag(&tag, s->repo, id);
7891 			if (err) {
7892 				if (err->code != GOT_ERR_OBJ_TYPE) {
7893 					free(id);
7894 					return err;
7895 				}
7896 				err = got_object_open_as_commit(&ci, s->repo,
7897 				    id);
7898 				if (err) {
7899 					free(id);
7900 					return err;
7901 				}
7902 				t = got_object_commit_get_committer_time(ci);
7903 				got_object_commit_close(ci);
7904 			} else {
7905 				t = got_object_tag_get_tagger_time(tag);
7906 				got_object_tag_close(tag);
7907 			}
7908 			free(id);
7909 			if (gmtime_r(&t, &tm) == NULL)
7910 				return got_error_from_errno("gmtime_r");
7911 			if (strftime(ymd, sizeof(ymd), "%G-%m-%d  ", &tm) == 0)
7912 				return got_error(GOT_ERR_NO_SPACE);
7913 		}
7914 		if (got_ref_is_symbolic(re->ref)) {
7915 			if (asprintf(&line, "%s%s -> %s", s->show_date ?
7916 			    ymd : "", got_ref_get_name(re->ref),
7917 			    got_ref_get_symref_target(re->ref)) == -1)
7918 				return got_error_from_errno("asprintf");
7919 		} else if (s->show_ids) {
7920 			struct got_object_id *id;
7921 			char *id_str;
7922 			err = got_ref_resolve(&id, s->repo, re->ref);
7923 			if (err)
7924 				return err;
7925 			err = got_object_id_str(&id_str, id);
7926 			if (err) {
7927 				free(id);
7928 				return err;
7929 			}
7930 			if (asprintf(&line, "%s%s: %s", s->show_date ? ymd : "",
7931 			    got_ref_get_name(re->ref), id_str) == -1) {
7932 				err = got_error_from_errno("asprintf");
7933 				free(id);
7934 				free(id_str);
7935 				return err;
7936 			}
7937 			free(id);
7938 			free(id_str);
7939 		} else if (asprintf(&line, "%s%s", s->show_date ? ymd : "",
7940 		    got_ref_get_name(re->ref)) == -1)
7941 			return got_error_from_errno("asprintf");
7942 
7943 		err = format_line(&wline, &width, NULL, line, 0, view->ncols,
7944 		    0, 0);
7945 		if (err) {
7946 			free(line);
7947 			return err;
7948 		}
7949 		if (n == s->selected) {
7950 			if (view->focussed)
7951 				wstandout(view->window);
7952 			s->selected_entry = re;
7953 		}
7954 		tc = match_color(&s->colors, got_ref_get_name(re->ref));
7955 		if (tc)
7956 			wattr_on(view->window,
7957 			    COLOR_PAIR(tc->colorpair), NULL);
7958 		waddwstr(view->window, wline);
7959 		if (tc)
7960 			wattr_off(view->window,
7961 			    COLOR_PAIR(tc->colorpair), NULL);
7962 		if (width < view->ncols - 1)
7963 			waddch(view->window, '\n');
7964 		if (n == s->selected && view->focussed)
7965 			wstandend(view->window);
7966 		free(line);
7967 		free(wline);
7968 		wline = NULL;
7969 		n++;
7970 		s->ndisplayed++;
7971 		s->last_displayed_entry = re;
7972 
7973 		limit--;
7974 		re = TAILQ_NEXT(re, entry);
7975 	}
7976 
7977 	view_border(view);
7978 	return err;
7979 }
7980 
7981 static const struct got_error *
7982 browse_ref_tree(struct tog_view **new_view, int begin_y, int begin_x,
7983     struct tog_reflist_entry *re, struct got_repository *repo)
7984 {
7985 	const struct got_error *err = NULL;
7986 	struct got_object_id *commit_id = NULL;
7987 	struct tog_view *tree_view;
7988 
7989 	*new_view = NULL;
7990 
7991 	err = resolve_reflist_entry(&commit_id, re, repo);
7992 	if (err) {
7993 		if (err->code != GOT_ERR_OBJ_TYPE)
7994 			return err;
7995 		else
7996 			return NULL;
7997 	}
7998 
7999 
8000 	tree_view = view_open(0, 0, begin_y, begin_x, TOG_VIEW_TREE);
8001 	if (tree_view == NULL) {
8002 		err = got_error_from_errno("view_open");
8003 		goto done;
8004 	}
8005 
8006 	err = open_tree_view(tree_view, commit_id,
8007 	    got_ref_get_name(re->ref), repo);
8008 	if (err)
8009 		goto done;
8010 
8011 	*new_view = tree_view;
8012 done:
8013 	free(commit_id);
8014 	return err;
8015 }
8016 
8017 static const struct got_error *
8018 ref_goto_line(struct tog_view *view, int nlines)
8019 {
8020 	const struct got_error		*err = NULL;
8021 	struct tog_ref_view_state	*s = &view->state.ref;
8022 	int				 g, idx = s->selected_entry->idx;
8023 
8024 	g = view->gline;
8025 	view->gline = 0;
8026 
8027 	if (g == 0)
8028 		g = 1;
8029 	else if (g > s->nrefs)
8030 		g = s->nrefs;
8031 
8032 	if (g >= s->first_displayed_entry->idx + 1 &&
8033 	    g <= s->last_displayed_entry->idx + 1 &&
8034 	    g - s->first_displayed_entry->idx - 1 < nlines) {
8035 		s->selected = g - s->first_displayed_entry->idx - 1;
8036 		return NULL;
8037 	}
8038 
8039 	if (idx + 1 < g) {
8040 		err = ref_scroll_down(view, g - idx - 1);
8041 		if (err)
8042 			return err;
8043 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL &&
8044 		    s->first_displayed_entry->idx + s->selected < g &&
8045 		    s->selected < s->ndisplayed - 1)
8046 			s->selected = g - s->first_displayed_entry->idx - 1;
8047 	} else if (idx + 1 > g)
8048 		ref_scroll_up(s, idx - g + 1);
8049 
8050 	if (g < nlines && s->first_displayed_entry->idx == 0)
8051 		s->selected = g - 1;
8052 
8053 	return NULL;
8054 
8055 }
8056 
8057 static const struct got_error *
8058 input_ref_view(struct tog_view **new_view, struct tog_view *view, int ch)
8059 {
8060 	const struct got_error *err = NULL;
8061 	struct tog_ref_view_state *s = &view->state.ref;
8062 	struct tog_reflist_entry *re;
8063 	int n, nscroll = view->nlines - 1;
8064 
8065 	if (view->gline)
8066 		return ref_goto_line(view, nscroll);
8067 
8068 	switch (ch) {
8069 	case 'i':
8070 		s->show_ids = !s->show_ids;
8071 		view->count = 0;
8072 		break;
8073 	case 'm':
8074 		s->show_date = !s->show_date;
8075 		view->count = 0;
8076 		break;
8077 	case 'o':
8078 		s->sort_by_date = !s->sort_by_date;
8079 		view->count = 0;
8080 		err = got_reflist_sort(&tog_refs, s->sort_by_date ?
8081 		    got_ref_cmp_by_commit_timestamp_descending :
8082 		    tog_ref_cmp_by_name, s->repo);
8083 		if (err)
8084 			break;
8085 		got_reflist_object_id_map_free(tog_refs_idmap);
8086 		err = got_reflist_object_id_map_create(&tog_refs_idmap,
8087 		    &tog_refs, s->repo);
8088 		if (err)
8089 			break;
8090 		ref_view_free_refs(s);
8091 		err = ref_view_load_refs(s);
8092 		break;
8093 	case KEY_ENTER:
8094 	case '\r':
8095 		view->count = 0;
8096 		if (!s->selected_entry)
8097 			break;
8098 		err = view_request_new(new_view, view, TOG_VIEW_LOG);
8099 		break;
8100 	case 'T':
8101 		view->count = 0;
8102 		if (!s->selected_entry)
8103 			break;
8104 		err = view_request_new(new_view, view, TOG_VIEW_TREE);
8105 		break;
8106 	case 'g':
8107 	case KEY_HOME:
8108 		s->selected = 0;
8109 		view->count = 0;
8110 		s->first_displayed_entry = TAILQ_FIRST(&s->refs);
8111 		break;
8112 	case 'G':
8113 	case KEY_END: {
8114 		int eos = view->nlines - 1;
8115 
8116 		if (view->mode == TOG_VIEW_SPLIT_HRZN)
8117 			--eos;  /* border */
8118 		s->selected = 0;
8119 		view->count = 0;
8120 		re = TAILQ_LAST(&s->refs, tog_reflist_head);
8121 		for (n = 0; n < eos; n++) {
8122 			if (re == NULL)
8123 				break;
8124 			s->first_displayed_entry = re;
8125 			re = TAILQ_PREV(re, tog_reflist_head, entry);
8126 		}
8127 		if (n > 0)
8128 			s->selected = n - 1;
8129 		break;
8130 	}
8131 	case 'k':
8132 	case KEY_UP:
8133 	case CTRL('p'):
8134 		if (s->selected > 0) {
8135 			s->selected--;
8136 			break;
8137 		}
8138 		ref_scroll_up(s, 1);
8139 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8140 			view->count = 0;
8141 		break;
8142 	case CTRL('u'):
8143 	case 'u':
8144 		nscroll /= 2;
8145 		/* FALL THROUGH */
8146 	case KEY_PPAGE:
8147 	case CTRL('b'):
8148 	case 'b':
8149 		if (s->first_displayed_entry == TAILQ_FIRST(&s->refs))
8150 			s->selected -= MIN(nscroll, s->selected);
8151 		ref_scroll_up(s, MAX(0, nscroll));
8152 		if (s->selected_entry == TAILQ_FIRST(&s->refs))
8153 			view->count = 0;
8154 		break;
8155 	case 'j':
8156 	case KEY_DOWN:
8157 	case CTRL('n'):
8158 		if (s->selected < s->ndisplayed - 1) {
8159 			s->selected++;
8160 			break;
8161 		}
8162 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8163 			/* can't scroll any further */
8164 			view->count = 0;
8165 			break;
8166 		}
8167 		ref_scroll_down(view, 1);
8168 		break;
8169 	case CTRL('d'):
8170 	case 'd':
8171 		nscroll /= 2;
8172 		/* FALL THROUGH */
8173 	case KEY_NPAGE:
8174 	case CTRL('f'):
8175 	case 'f':
8176 	case ' ':
8177 		if (TAILQ_NEXT(s->last_displayed_entry, entry) == NULL) {
8178 			/* can't scroll any further; move cursor down */
8179 			if (s->selected < s->ndisplayed - 1)
8180 				s->selected += MIN(nscroll,
8181 				    s->ndisplayed - s->selected - 1);
8182 			if (view->count > 1 && s->selected < s->ndisplayed - 1)
8183 				s->selected += s->ndisplayed - s->selected - 1;
8184 			view->count = 0;
8185 			break;
8186 		}
8187 		ref_scroll_down(view, nscroll);
8188 		break;
8189 	case CTRL('l'):
8190 		view->count = 0;
8191 		tog_free_refs();
8192 		err = tog_load_refs(s->repo, s->sort_by_date);
8193 		if (err)
8194 			break;
8195 		ref_view_free_refs(s);
8196 		err = ref_view_load_refs(s);
8197 		break;
8198 	case KEY_RESIZE:
8199 		if (view->nlines >= 2 && s->selected >= view->nlines - 1)
8200 			s->selected = view->nlines - 2;
8201 		break;
8202 	default:
8203 		view->count = 0;
8204 		break;
8205 	}
8206 
8207 	return err;
8208 }
8209 
8210 __dead static void
8211 usage_ref(void)
8212 {
8213 	endwin();
8214 	fprintf(stderr, "usage: %s ref [-r repository-path]\n",
8215 	    getprogname());
8216 	exit(1);
8217 }
8218 
8219 static const struct got_error *
8220 cmd_ref(int argc, char *argv[])
8221 {
8222 	const struct got_error *error;
8223 	struct got_repository *repo = NULL;
8224 	struct got_worktree *worktree = NULL;
8225 	char *cwd = NULL, *repo_path = NULL;
8226 	int ch;
8227 	struct tog_view *view;
8228 	int *pack_fds = NULL;
8229 
8230 	while ((ch = getopt(argc, argv, "r:")) != -1) {
8231 		switch (ch) {
8232 		case 'r':
8233 			repo_path = realpath(optarg, NULL);
8234 			if (repo_path == NULL)
8235 				return got_error_from_errno2("realpath",
8236 				    optarg);
8237 			break;
8238 		default:
8239 			usage_ref();
8240 			/* NOTREACHED */
8241 		}
8242 	}
8243 
8244 	argc -= optind;
8245 	argv += optind;
8246 
8247 	if (argc > 1)
8248 		usage_ref();
8249 
8250 	error = got_repo_pack_fds_open(&pack_fds);
8251 	if (error != NULL)
8252 		goto done;
8253 
8254 	if (repo_path == NULL) {
8255 		cwd = getcwd(NULL, 0);
8256 		if (cwd == NULL)
8257 			return got_error_from_errno("getcwd");
8258 		error = got_worktree_open(&worktree, cwd);
8259 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
8260 			goto done;
8261 		if (worktree)
8262 			repo_path =
8263 			    strdup(got_worktree_get_repo_path(worktree));
8264 		else
8265 			repo_path = strdup(cwd);
8266 		if (repo_path == NULL) {
8267 			error = got_error_from_errno("strdup");
8268 			goto done;
8269 		}
8270 	}
8271 
8272 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8273 	if (error != NULL)
8274 		goto done;
8275 
8276 	init_curses();
8277 
8278 	error = apply_unveil(got_repo_get_path(repo), NULL);
8279 	if (error)
8280 		goto done;
8281 
8282 	error = tog_load_refs(repo, 0);
8283 	if (error)
8284 		goto done;
8285 
8286 	view = view_open(0, 0, 0, 0, TOG_VIEW_REF);
8287 	if (view == NULL) {
8288 		error = got_error_from_errno("view_open");
8289 		goto done;
8290 	}
8291 
8292 	error = open_ref_view(view, repo);
8293 	if (error)
8294 		goto done;
8295 
8296 	if (worktree) {
8297 		/* Release work tree lock. */
8298 		got_worktree_close(worktree);
8299 		worktree = NULL;
8300 	}
8301 	error = view_loop(view);
8302 done:
8303 	free(repo_path);
8304 	free(cwd);
8305 	if (repo) {
8306 		const struct got_error *close_err = got_repo_close(repo);
8307 		if (close_err)
8308 			error = close_err;
8309 	}
8310 	if (pack_fds) {
8311 		const struct got_error *pack_err =
8312 		    got_repo_pack_fds_close(pack_fds);
8313 		if (error == NULL)
8314 			error = pack_err;
8315 	}
8316 	tog_free_refs();
8317 	return error;
8318 }
8319 
8320 static const struct got_error *
8321 view_dispatch_request(struct tog_view **new_view, struct tog_view *view,
8322     enum tog_view_type request, int y, int x)
8323 {
8324 	const struct got_error *err = NULL;
8325 
8326 	*new_view = NULL;
8327 
8328 	switch (request) {
8329 	case TOG_VIEW_DIFF:
8330 		if (view->type == TOG_VIEW_LOG) {
8331 			struct tog_log_view_state *s = &view->state.log;
8332 
8333 			err = open_diff_view_for_commit(new_view, y, x,
8334 			    s->selected_entry->commit, s->selected_entry->id,
8335 			    view, s->repo);
8336 		} else
8337 			return got_error_msg(GOT_ERR_NOT_IMPL,
8338 			    "parent/child view pair not supported");
8339 		break;
8340 	case TOG_VIEW_BLAME:
8341 		if (view->type == TOG_VIEW_TREE) {
8342 			struct tog_tree_view_state *s = &view->state.tree;
8343 
8344 			err = blame_tree_entry(new_view, y, x,
8345 			    s->selected_entry, &s->parents, s->commit_id,
8346 			    s->repo);
8347 		} else
8348 			return got_error_msg(GOT_ERR_NOT_IMPL,
8349 			    "parent/child view pair not supported");
8350 		break;
8351 	case TOG_VIEW_LOG:
8352 		if (view->type == TOG_VIEW_BLAME)
8353 			err = log_annotated_line(new_view, y, x,
8354 			    view->state.blame.repo, view->state.blame.id_to_log);
8355 		else if (view->type == TOG_VIEW_TREE)
8356 			err = log_selected_tree_entry(new_view, y, x,
8357 			    &view->state.tree);
8358 		else if (view->type == TOG_VIEW_REF)
8359 			err = log_ref_entry(new_view, y, x,
8360 			    view->state.ref.selected_entry,
8361 			    view->state.ref.repo);
8362 		else
8363 			return got_error_msg(GOT_ERR_NOT_IMPL,
8364 			    "parent/child view pair not supported");
8365 		break;
8366 	case TOG_VIEW_TREE:
8367 		if (view->type == TOG_VIEW_LOG)
8368 			err = browse_commit_tree(new_view, y, x,
8369 			    view->state.log.selected_entry,
8370 			    view->state.log.in_repo_path,
8371 			    view->state.log.head_ref_name,
8372 			    view->state.log.repo);
8373 		else if (view->type == TOG_VIEW_REF)
8374 			err = browse_ref_tree(new_view, y, x,
8375 			    view->state.ref.selected_entry,
8376 			    view->state.ref.repo);
8377 		else
8378 			return got_error_msg(GOT_ERR_NOT_IMPL,
8379 			    "parent/child view pair not supported");
8380 		break;
8381 	case TOG_VIEW_REF:
8382 		*new_view = view_open(0, 0, y, x, TOG_VIEW_REF);
8383 		if (*new_view == NULL)
8384 			return got_error_from_errno("view_open");
8385 		if (view->type == TOG_VIEW_LOG)
8386 			err = open_ref_view(*new_view, view->state.log.repo);
8387 		else if (view->type == TOG_VIEW_TREE)
8388 			err = open_ref_view(*new_view, view->state.tree.repo);
8389 		else
8390 			err = got_error_msg(GOT_ERR_NOT_IMPL,
8391 			    "parent/child view pair not supported");
8392 		if (err)
8393 			view_close(*new_view);
8394 		break;
8395 	default:
8396 		return got_error_msg(GOT_ERR_NOT_IMPL, "invalid view");
8397 	}
8398 
8399 	return err;
8400 }
8401 
8402 /*
8403  * If view was scrolled down to move the selected line into view when opening a
8404  * horizontal split, scroll back up when closing the split/toggling fullscreen.
8405  */
8406 static void
8407 offset_selection_up(struct tog_view *view)
8408 {
8409 	switch (view->type) {
8410 	case TOG_VIEW_BLAME: {
8411 		struct tog_blame_view_state *s = &view->state.blame;
8412 		if (s->first_displayed_line == 1) {
8413 			s->selected_line = MAX(s->selected_line - view->offset,
8414 			    1);
8415 			break;
8416 		}
8417 		if (s->first_displayed_line > view->offset)
8418 			s->first_displayed_line -= view->offset;
8419 		else
8420 			s->first_displayed_line = 1;
8421 		s->selected_line += view->offset;
8422 		break;
8423 	}
8424 	case TOG_VIEW_LOG:
8425 		log_scroll_up(&view->state.log, view->offset);
8426 		view->state.log.selected += view->offset;
8427 		break;
8428 	case TOG_VIEW_REF:
8429 		ref_scroll_up(&view->state.ref, view->offset);
8430 		view->state.ref.selected += view->offset;
8431 		break;
8432 	case TOG_VIEW_TREE:
8433 		tree_scroll_up(&view->state.tree, view->offset);
8434 		view->state.tree.selected += view->offset;
8435 		break;
8436 	default:
8437 		break;
8438 	}
8439 
8440 	view->offset = 0;
8441 }
8442 
8443 /*
8444  * If the selected line is in the section of screen covered by the bottom split,
8445  * scroll down offset lines to move it into view and index its new position.
8446  */
8447 static const struct got_error *
8448 offset_selection_down(struct tog_view *view)
8449 {
8450 	const struct got_error	*err = NULL;
8451 	const struct got_error	*(*scrolld)(struct tog_view *, int);
8452 	int			*selected = NULL;
8453 	int			 header, offset;
8454 
8455 	switch (view->type) {
8456 	case TOG_VIEW_BLAME: {
8457 		struct tog_blame_view_state *s = &view->state.blame;
8458 		header = 3;
8459 		scrolld = NULL;
8460 		if (s->selected_line > view->nlines - header) {
8461 			offset = abs(view->nlines - s->selected_line - header);
8462 			s->first_displayed_line += offset;
8463 			s->selected_line -= offset;
8464 			view->offset = offset;
8465 		}
8466 		break;
8467 	}
8468 	case TOG_VIEW_LOG: {
8469 		struct tog_log_view_state *s = &view->state.log;
8470 		scrolld = &log_scroll_down;
8471 		header = view_is_parent_view(view) ? 3 : 2;
8472 		selected = &s->selected;
8473 		break;
8474 	}
8475 	case TOG_VIEW_REF: {
8476 		struct tog_ref_view_state *s = &view->state.ref;
8477 		scrolld = &ref_scroll_down;
8478 		header = 3;
8479 		selected = &s->selected;
8480 		break;
8481 	}
8482 	case TOG_VIEW_TREE: {
8483 		struct tog_tree_view_state *s = &view->state.tree;
8484 		scrolld = &tree_scroll_down;
8485 		header = 5;
8486 		selected = &s->selected;
8487 		break;
8488 	}
8489 	default:
8490 		selected = NULL;
8491 		scrolld = NULL;
8492 		header = 0;
8493 		break;
8494 	}
8495 
8496 	if (selected && *selected > view->nlines - header) {
8497 		offset = abs(view->nlines - *selected - header);
8498 		view->offset = offset;
8499 		if (scrolld && offset) {
8500 			err = scrolld(view, offset);
8501 			*selected -= offset;
8502 		}
8503 	}
8504 
8505 	return err;
8506 }
8507 
8508 static void
8509 list_commands(FILE *fp)
8510 {
8511 	size_t i;
8512 
8513 	fprintf(fp, "commands:");
8514 	for (i = 0; i < nitems(tog_commands); i++) {
8515 		const struct tog_cmd *cmd = &tog_commands[i];
8516 		fprintf(fp, " %s", cmd->name);
8517 	}
8518 	fputc('\n', fp);
8519 }
8520 
8521 __dead static void
8522 usage(int hflag, int status)
8523 {
8524 	FILE *fp = (status == 0) ? stdout : stderr;
8525 
8526 	fprintf(fp, "usage: %s [-h] [-V | --version] [command] [arg ...]\n",
8527 	    getprogname());
8528 	if (hflag) {
8529 		fprintf(fp, "lazy usage: %s path\n", getprogname());
8530 		list_commands(fp);
8531 	}
8532 	exit(status);
8533 }
8534 
8535 static char **
8536 make_argv(int argc, ...)
8537 {
8538 	va_list ap;
8539 	char **argv;
8540 	int i;
8541 
8542 	va_start(ap, argc);
8543 
8544 	argv = calloc(argc, sizeof(char *));
8545 	if (argv == NULL)
8546 		err(1, "calloc");
8547 	for (i = 0; i < argc; i++) {
8548 		argv[i] = strdup(va_arg(ap, char *));
8549 		if (argv[i] == NULL)
8550 			err(1, "strdup");
8551 	}
8552 
8553 	va_end(ap);
8554 	return argv;
8555 }
8556 
8557 /*
8558  * Try to convert 'tog path' into a 'tog log path' command.
8559  * The user could simply have mistyped the command rather than knowingly
8560  * provided a path. So check whether argv[0] can in fact be resolved
8561  * to a path in the HEAD commit and print a special error if not.
8562  * This hack is for mpi@ <3
8563  */
8564 static const struct got_error *
8565 tog_log_with_path(int argc, char *argv[])
8566 {
8567 	const struct got_error *error = NULL, *close_err;
8568 	const struct tog_cmd *cmd = NULL;
8569 	struct got_repository *repo = NULL;
8570 	struct got_worktree *worktree = NULL;
8571 	struct got_object_id *commit_id = NULL, *id = NULL;
8572 	struct got_commit_object *commit = NULL;
8573 	char *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
8574 	char *commit_id_str = NULL, **cmd_argv = NULL;
8575 	int *pack_fds = NULL;
8576 
8577 	cwd = getcwd(NULL, 0);
8578 	if (cwd == NULL)
8579 		return got_error_from_errno("getcwd");
8580 
8581 	error = got_repo_pack_fds_open(&pack_fds);
8582 	if (error != NULL)
8583 		goto done;
8584 
8585 	error = got_worktree_open(&worktree, cwd);
8586 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
8587 		goto done;
8588 
8589 	if (worktree)
8590 		repo_path = strdup(got_worktree_get_repo_path(worktree));
8591 	else
8592 		repo_path = strdup(cwd);
8593 	if (repo_path == NULL) {
8594 		error = got_error_from_errno("strdup");
8595 		goto done;
8596 	}
8597 
8598 	error = got_repo_open(&repo, repo_path, NULL, pack_fds);
8599 	if (error != NULL)
8600 		goto done;
8601 
8602 	error = get_in_repo_path_from_argv0(&in_repo_path, argc, argv,
8603 	    repo, worktree);
8604 	if (error)
8605 		goto done;
8606 
8607 	error = tog_load_refs(repo, 0);
8608 	if (error)
8609 		goto done;
8610 	error = got_repo_match_object_id(&commit_id, NULL, worktree ?
8611 	    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
8612 	    GOT_OBJ_TYPE_COMMIT, &tog_refs, repo);
8613 	if (error)
8614 		goto done;
8615 
8616 	if (worktree) {
8617 		got_worktree_close(worktree);
8618 		worktree = NULL;
8619 	}
8620 
8621 	error = got_object_open_as_commit(&commit, repo, commit_id);
8622 	if (error)
8623 		goto done;
8624 
8625 	error = got_object_id_by_path(&id, repo, commit, in_repo_path);
8626 	if (error) {
8627 		if (error->code != GOT_ERR_NO_TREE_ENTRY)
8628 			goto done;
8629 		fprintf(stderr, "%s: '%s' is no known command or path\n",
8630 		    getprogname(), argv[0]);
8631 		usage(1, 1);
8632 		/* not reached */
8633 	}
8634 
8635 	error = got_object_id_str(&commit_id_str, commit_id);
8636 	if (error)
8637 		goto done;
8638 
8639 	cmd = &tog_commands[0]; /* log */
8640 	argc = 4;
8641 	cmd_argv = make_argv(argc, cmd->name, "-c", commit_id_str, argv[0]);
8642 	error = cmd->cmd_main(argc, cmd_argv);
8643 done:
8644 	if (repo) {
8645 		close_err = got_repo_close(repo);
8646 		if (error == NULL)
8647 			error = close_err;
8648 	}
8649 	if (commit)
8650 		got_object_commit_close(commit);
8651 	if (worktree)
8652 		got_worktree_close(worktree);
8653 	if (pack_fds) {
8654 		const struct got_error *pack_err =
8655 		    got_repo_pack_fds_close(pack_fds);
8656 		if (error == NULL)
8657 			error = pack_err;
8658 	}
8659 	free(id);
8660 	free(commit_id_str);
8661 	free(commit_id);
8662 	free(cwd);
8663 	free(repo_path);
8664 	free(in_repo_path);
8665 	if (cmd_argv) {
8666 		int i;
8667 		for (i = 0; i < argc; i++)
8668 			free(cmd_argv[i]);
8669 		free(cmd_argv);
8670 	}
8671 	tog_free_refs();
8672 	return error;
8673 }
8674 
8675 int
8676 main(int argc, char *argv[])
8677 {
8678 	const struct got_error *error = NULL;
8679 	const struct tog_cmd *cmd = NULL;
8680 	int ch, hflag = 0, Vflag = 0;
8681 	char **cmd_argv = NULL;
8682 	static const struct option longopts[] = {
8683 	    { "version", no_argument, NULL, 'V' },
8684 	    { NULL, 0, NULL, 0}
8685 	};
8686 	char *diff_algo_str = NULL;
8687 
8688 	if (!isatty(STDIN_FILENO))
8689 		errx(1, "standard input is not a tty");
8690 
8691 	setlocale(LC_CTYPE, "");
8692 
8693 	while ((ch = getopt_long(argc, argv, "+hV", longopts, NULL)) != -1) {
8694 		switch (ch) {
8695 		case 'h':
8696 			hflag = 1;
8697 			break;
8698 		case 'V':
8699 			Vflag = 1;
8700 			break;
8701 		default:
8702 			usage(hflag, 1);
8703 			/* NOTREACHED */
8704 		}
8705 	}
8706 
8707 	argc -= optind;
8708 	argv += optind;
8709 	optind = 1;
8710 	optreset = 1;
8711 
8712 	if (Vflag) {
8713 		got_version_print_str();
8714 		return 0;
8715 	}
8716 
8717 #ifndef PROFILE
8718 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
8719 	    NULL) == -1)
8720 		err(1, "pledge");
8721 #endif
8722 
8723 	if (argc == 0) {
8724 		if (hflag)
8725 			usage(hflag, 0);
8726 		/* Build an argument vector which runs a default command. */
8727 		cmd = &tog_commands[0];
8728 		argc = 1;
8729 		cmd_argv = make_argv(argc, cmd->name);
8730 	} else {
8731 		size_t i;
8732 
8733 		/* Did the user specify a command? */
8734 		for (i = 0; i < nitems(tog_commands); i++) {
8735 			if (strncmp(tog_commands[i].name, argv[0],
8736 			    strlen(argv[0])) == 0) {
8737 				cmd = &tog_commands[i];
8738 				break;
8739 			}
8740 		}
8741 	}
8742 
8743 	diff_algo_str = getenv("TOG_DIFF_ALGORITHM");
8744 	if (diff_algo_str) {
8745 		if (strcasecmp(diff_algo_str, "patience") == 0)
8746 			tog_diff_algo = GOT_DIFF_ALGORITHM_PATIENCE;
8747 		if (strcasecmp(diff_algo_str, "myers") == 0)
8748 			tog_diff_algo = GOT_DIFF_ALGORITHM_MYERS;
8749 	}
8750 
8751 	if (cmd == NULL) {
8752 		if (argc != 1)
8753 			usage(0, 1);
8754 		/* No command specified; try log with a path */
8755 		error = tog_log_with_path(argc, argv);
8756 	} else {
8757 		if (hflag)
8758 			cmd->cmd_usage();
8759 		else
8760 			error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
8761 	}
8762 
8763 	endwin();
8764 	putchar('\n');
8765 	if (cmd_argv) {
8766 		int i;
8767 		for (i = 0; i < argc; i++)
8768 			free(cmd_argv[i]);
8769 		free(cmd_argv);
8770 	}
8771 
8772 	if (error && error->code != GOT_ERR_CANCELLED)
8773 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
8774 	return 0;
8775 }