1 /*
2  * Copyright (c) 2018, 2019 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 <errno.h>
22 #define _XOPEN_SOURCE_EXTENDED
23 #include <curses.h>
24 #undef _XOPEN_SOURCE_EXTENDED
25 #include <panel.h>
26 #include <locale.h>
27 #include <stdlib.h>
28 #include <stdio.h>
29 #include <getopt.h>
30 #include <string.h>
31 #include <err.h>
32 #include <unistd.h>
33 #include <util.h>
34 #include <limits.h>
35 #include <wchar.h>
36 #include <time.h>
37 #include <pthread.h>
38 #include <libgen.h>
39 
40 #include "got_error.h"
41 #include "got_object.h"
42 #include "got_reference.h"
43 #include "got_repository.h"
44 #include "got_diff.h"
45 #include "got_opentemp.h"
46 #include "got_commit_graph.h"
47 #include "got_utf8.h"
48 #include "got_blame.h"
49 #include "got_privsep.h"
50 #include "got_worktree.h"
51 
52 #ifndef MIN
53 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
54 #endif
55 
56 #ifndef MAX
57 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
58 #endif
59 
60 
61 #ifndef nitems
62 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
63 #endif
64 
65 struct tog_cmd {
66 	const char *name;
67 	const struct got_error *(*cmd_main)(int, char *[]);
68 	void (*cmd_usage)(void);
69 	const char *descr;
70 };
71 
72 __dead static void	usage(void);
73 __dead static void	usage_log(void);
74 __dead static void	usage_diff(void);
75 __dead static void	usage_blame(void);
76 __dead static void	usage_tree(void);
77 
78 static const struct got_error*	cmd_log(int, char *[]);
79 static const struct got_error*	cmd_diff(int, char *[]);
80 static const struct got_error*	cmd_blame(int, char *[]);
81 static const struct got_error*	cmd_tree(int, char *[]);
82 
83 static struct tog_cmd tog_commands[] = {
84 	{ "log",	cmd_log,	usage_log,
85 	    "show repository history" },
86 	{ "diff",	cmd_diff,	usage_diff,
87 	    "compare files and directories" },
88 	{ "blame",	cmd_blame,	usage_blame,
89 	    "show line-by-line file history" },
90 	{ "tree",	cmd_tree,	usage_tree,
91 	    "browse trees in repository" },
92 };
93 
94 enum tog_view_type {
95 	TOG_VIEW_DIFF,
96 	TOG_VIEW_LOG,
97 	TOG_VIEW_BLAME,
98 	TOG_VIEW_TREE
99 };
100 
101 struct commit_queue_entry {
102 	TAILQ_ENTRY(commit_queue_entry) entry;
103 	struct got_object_id *id;
104 	struct got_commit_object *commit;
105 	int idx;
106 };
107 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
108 struct commit_queue {
109 	int ncommits;
110 	struct commit_queue_head head;
111 };
112 
113 struct tog_diff_view_state {
114 	struct got_object_id *id1, *id2;
115 	FILE *f;
116 	int first_displayed_line;
117 	int last_displayed_line;
118 	int eof;
119 	int diff_context;
120 	struct got_repository *repo;
121 	struct got_reflist_head *refs;
122 
123 	/* passed from log view; may be NULL */
124 	struct tog_view *log_view;
125 };
126 
127 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
128 
129 struct tog_log_thread_args {
130 	pthread_cond_t need_commits;
131 	int commits_needed;
132 	struct got_commit_graph *graph;
133 	struct commit_queue *commits;
134 	const char *in_repo_path;
135 	struct got_object_id *start_id;
136 	struct got_repository *repo;
137 	int log_complete;
138 	sig_atomic_t *quit;
139 	struct tog_view *view;
140 	struct commit_queue_entry **first_displayed_entry;
141 	struct commit_queue_entry **selected_entry;
142 };
143 
144 struct tog_log_view_state {
145 	struct commit_queue commits;
146 	struct commit_queue_entry *first_displayed_entry;
147 	struct commit_queue_entry *last_displayed_entry;
148 	struct commit_queue_entry *selected_entry;
149 	int selected;
150 	char *in_repo_path;
151 	struct got_repository *repo;
152 	struct got_reflist_head *refs;
153 	struct got_object_id *start_id;
154 	sig_atomic_t quit;
155 	pthread_t thread;
156 	struct tog_log_thread_args thread_args;
157 };
158 
159 struct tog_blame_cb_args {
160 	struct tog_blame_line *lines; /* one per line */
161 	int nlines;
162 
163 	struct tog_view *view;
164 	struct got_object_id *commit_id;
165 	int *quit;
166 };
167 
168 struct tog_blame_thread_args {
169 	const char *path;
170 	struct got_repository *repo;
171 	struct tog_blame_cb_args *cb_args;
172 	int *complete;
173 };
174 
175 struct tog_blame {
176 	FILE *f;
177 	size_t filesize;
178 	struct tog_blame_line *lines;
179 	int nlines;
180 	pthread_t thread;
181 	struct tog_blame_thread_args thread_args;
182 	struct tog_blame_cb_args cb_args;
183 	const char *path;
184 };
185 
186 struct tog_blame_view_state {
187 	int first_displayed_line;
188 	int last_displayed_line;
189 	int selected_line;
190 	int blame_complete;
191 	int eof;
192 	int done;
193 	struct got_object_id_queue blamed_commits;
194 	struct got_object_qid *blamed_commit;
195 	char *path;
196 	struct got_repository *repo;
197 	struct got_reflist_head *refs;
198 	struct got_object_id *commit_id;
199 	struct tog_blame blame;
200 };
201 
202 struct tog_parent_tree {
203 	TAILQ_ENTRY(tog_parent_tree) entry;
204 	struct got_tree_object *tree;
205 	struct got_tree_entry *first_displayed_entry;
206 	struct got_tree_entry *selected_entry;
207 	int selected;
208 };
209 
210 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
211 
212 struct tog_tree_view_state {
213 	char *tree_label;
214 	struct got_tree_object *root;
215 	struct got_tree_object *tree;
216 	const struct got_tree_entries *entries;
217 	struct got_tree_entry *first_displayed_entry;
218 	struct got_tree_entry *last_displayed_entry;
219 	struct got_tree_entry *selected_entry;
220 	int ndisplayed, selected, show_ids;
221 	struct tog_parent_trees parents;
222 	struct got_object_id *commit_id;
223 	struct got_repository *repo;
224 	struct got_reflist_head *refs;
225 };
226 
227 /*
228  * We implement two types of views: parent views and child views.
229  *
230  * The 'Tab' key switches between a parent view and its child view.
231  * Child views are shown side-by-side to their parent view, provided
232  * there is enough screen estate.
233  *
234  * When a new view is opened from within a parent view, this new view
235  * becomes a child view of the parent view, replacing any existing child.
236  *
237  * When a new view is opened from within a child view, this new view
238  * becomes a parent view which will obscure the views below until the
239  * user quits the new parent view by typing 'q'.
240  *
241  * This list of views contains parent views only.
242  * Child views are only pointed to by their parent view.
243  */
244 TAILQ_HEAD(tog_view_list_head, tog_view);
245 
246 struct tog_view {
247 	TAILQ_ENTRY(tog_view) entry;
248 	WINDOW *window;
249 	PANEL *panel;
250 	int nlines, ncols, begin_y, begin_x;
251 	int lines, cols; /* copies of LINES and COLS */
252 	int focussed;
253 	struct tog_view *parent;
254 	struct tog_view *child;
255 	int child_focussed;
256 
257 	/* type-specific state */
258 	enum tog_view_type type;
259 	union {
260 		struct tog_diff_view_state diff;
261 		struct tog_log_view_state log;
262 		struct tog_blame_view_state blame;
263 		struct tog_tree_view_state tree;
264 	} state;
265 
266 	const struct got_error *(*show)(struct tog_view *);
267 	const struct got_error *(*input)(struct tog_view **,
268 	    struct tog_view **, struct tog_view**, struct tog_view *, int);
269 	const struct got_error *(*close)(struct tog_view *);
270 };
271 
272 static const struct got_error *open_diff_view(struct tog_view *,
273     struct got_object_id *, struct got_object_id *, struct tog_view *,
274     struct got_reflist_head *, struct got_repository *);
275 static const struct got_error *show_diff_view(struct tog_view *);
276 static const struct got_error *input_diff_view(struct tog_view **,
277     struct tog_view **, struct tog_view **, struct tog_view *, int);
278 static const struct got_error* close_diff_view(struct tog_view *);
279 
280 static const struct got_error *open_log_view(struct tog_view *,
281     struct got_object_id *, struct got_reflist_head *,
282     struct got_repository *, const char *, int);
283 static const struct got_error * show_log_view(struct tog_view *);
284 static const struct got_error *input_log_view(struct tog_view **,
285     struct tog_view **, struct tog_view **, struct tog_view *, int);
286 static const struct got_error *close_log_view(struct tog_view *);
287 
288 static const struct got_error *open_blame_view(struct tog_view *, char *,
289     struct got_object_id *, struct got_reflist_head *, struct got_repository *);
290 static const struct got_error *show_blame_view(struct tog_view *);
291 static const struct got_error *input_blame_view(struct tog_view **,
292     struct tog_view **, struct tog_view **, struct tog_view *, int);
293 static const struct got_error *close_blame_view(struct tog_view *);
294 
295 static const struct got_error *open_tree_view(struct tog_view *,
296     struct got_tree_object *, struct got_object_id *,
297     struct got_reflist_head *, struct got_repository *);
298 static const struct got_error *show_tree_view(struct tog_view *);
299 static const struct got_error *input_tree_view(struct tog_view **,
300     struct tog_view **, struct tog_view **, struct tog_view *, int);
301 static const struct got_error *close_tree_view(struct tog_view *);
302 
303 static volatile sig_atomic_t tog_sigwinch_received;
304 
305 static void
306 tog_sigwinch(int signo)
307 {
308 	tog_sigwinch_received = 1;
309 }
310 
311 static const struct got_error *
312 view_close(struct tog_view *view)
313 {
314 	const struct got_error *err = NULL;
315 
316 	if (view->child) {
317 		view_close(view->child);
318 		view->child = NULL;
319 	}
320 	if (view->close)
321 		err = view->close(view);
322 	if (view->panel)
323 		del_panel(view->panel);
324 	if (view->window)
325 		delwin(view->window);
326 	free(view);
327 	return err;
328 }
329 
330 static struct tog_view *
331 view_open(int nlines, int ncols, int begin_y, int begin_x,
332     enum tog_view_type type)
333 {
334 	struct tog_view *view = calloc(1, sizeof(*view));
335 
336 	if (view == NULL)
337 		return NULL;
338 
339 	view->type = type;
340 	view->lines = LINES;
341 	view->cols = COLS;
342 	view->nlines = nlines ? nlines : LINES - begin_y;
343 	view->ncols = ncols ? ncols : COLS - begin_x;
344 	view->begin_y = begin_y;
345 	view->begin_x = begin_x;
346 	view->window = newwin(nlines, ncols, begin_y, begin_x);
347 	if (view->window == NULL) {
348 		view_close(view);
349 		return NULL;
350 	}
351 	view->panel = new_panel(view->window);
352 	if (view->panel == NULL ||
353 	    set_panel_userptr(view->panel, view) != OK) {
354 		view_close(view);
355 		return NULL;
356 	}
357 
358 	keypad(view->window, TRUE);
359 	return view;
360 }
361 
362 static int
363 view_split_begin_x(int begin_x)
364 {
365 	if (begin_x > 0 || COLS < 120)
366 		return 0;
367 	return (COLS - MAX(COLS / 2, 80));
368 }
369 
370 static const struct got_error *view_resize(struct tog_view *);
371 
372 static const struct got_error *
373 view_splitscreen(struct tog_view *view)
374 {
375 	const struct got_error *err = NULL;
376 
377 	view->begin_y = 0;
378 	view->begin_x = view_split_begin_x(0);
379 	view->nlines = LINES;
380 	view->ncols = COLS - view->begin_x;
381 	view->lines = LINES;
382 	view->cols = COLS;
383 	err = view_resize(view);
384 	if (err)
385 		return err;
386 
387 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
388 		return got_error_prefix_errno("mvwin");
389 
390 	return NULL;
391 }
392 
393 static const struct got_error *
394 view_fullscreen(struct tog_view *view)
395 {
396 	const struct got_error *err = NULL;
397 
398 	view->begin_x = 0;
399 	view->begin_y = 0;
400 	view->nlines = LINES;
401 	view->ncols = COLS;
402 	view->lines = LINES;
403 	view->cols = COLS;
404 	err = view_resize(view);
405 	if (err)
406 		return err;
407 
408 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
409 		return got_error_prefix_errno("mvwin");
410 
411 	return NULL;
412 }
413 
414 static int
415 view_is_parent_view(struct tog_view *view)
416 {
417 	return view->parent == NULL;
418 }
419 
420 static const struct got_error *
421 view_resize(struct tog_view *view)
422 {
423 	int nlines, ncols;
424 
425 	if (view->lines > LINES)
426 		nlines = view->nlines - (view->lines - LINES);
427 	else
428 		nlines = view->nlines + (LINES - view->lines);
429 
430 	if (view->cols > COLS)
431 		ncols = view->ncols - (view->cols - COLS);
432 	else
433 		ncols = view->ncols + (COLS - view->cols);
434 
435 	if (wresize(view->window, nlines, ncols) == ERR)
436 		return got_error_prefix_errno("wresize");
437 	if (replace_panel(view->panel, view->window) == ERR)
438 		return got_error_prefix_errno("replace_panel");
439 	wclear(view->window);
440 
441 	view->nlines = nlines;
442 	view->ncols = ncols;
443 	view->lines = LINES;
444 	view->cols = COLS;
445 
446 	if (view->child) {
447 		view->child->begin_x = view_split_begin_x(view->begin_x);
448 		if (view->child->begin_x == 0) {
449 			view_fullscreen(view->child);
450 			if (view->child->focussed)
451 				show_panel(view->child->panel);
452 			else
453 				show_panel(view->panel);
454 		} else {
455 			view_splitscreen(view->child);
456 			show_panel(view->child->panel);
457 		}
458 	}
459 
460 	return NULL;
461 }
462 
463 static const struct got_error *
464 view_close_child(struct tog_view *view)
465 {
466 	const struct got_error *err = NULL;
467 
468 	if (view->child == NULL)
469 		return NULL;
470 
471 	err = view_close(view->child);
472 	view->child = NULL;
473 	return err;
474 }
475 
476 static const struct got_error *
477 view_set_child(struct tog_view *view, struct tog_view *child)
478 {
479 	const struct got_error *err = NULL;
480 
481 	view->child = child;
482 	child->parent = view;
483 	return err;
484 }
485 
486 static int
487 view_is_splitscreen(struct tog_view *view)
488 {
489 	return view->begin_x > 0;
490 }
491 
492 /*
493  * Erase all content of the view. Can be used to "flash" the view because
494  * the view loop will redraw it quickly, providing a more subtle visual
495  * effect than curs_flash(3) would provide.
496  */
497 static void
498 view_flash(struct tog_view *view)
499 {
500 	werase(view->window);
501 	update_panels();
502 	doupdate();
503 }
504 
505 static void
506 tog_resizeterm(void)
507 {
508 	int cols, lines;
509 	struct winsize size;
510 
511 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
512 		cols = 80;     /* Default */
513 		lines = 24;
514 	} else {
515 		cols = size.ws_col;
516 		lines = size.ws_row;
517 	}
518 	resize_term(lines, cols);
519 }
520 
521 static const struct got_error *
522 view_input(struct tog_view **new, struct tog_view **dead,
523     struct tog_view **focus, int *done, struct tog_view *view,
524     struct tog_view_list_head *views)
525 {
526 	const struct got_error *err = NULL;
527 	struct tog_view *v;
528 	int ch, errcode;
529 
530 	*new = NULL;
531 	*dead = NULL;
532 	*focus = NULL;
533 
534 	nodelay(stdscr, FALSE);
535 	/* Allow threads to make progress while we are waiting for input. */
536 	errcode = pthread_mutex_unlock(&tog_mutex);
537 	if (errcode)
538 		return got_error_set_errno(errcode);
539 	ch = wgetch(view->window);
540 	errcode = pthread_mutex_lock(&tog_mutex);
541 	if (errcode)
542 		return got_error_set_errno(errcode);
543 	nodelay(stdscr, TRUE);
544 
545 	if (tog_sigwinch_received) {
546 		tog_resizeterm();
547 		tog_sigwinch_received = 0;
548 		TAILQ_FOREACH(v, views, entry) {
549 			err = view_resize(v);
550 			if (err)
551 				return err;
552 			err = v->input(new, dead, focus, v, KEY_RESIZE);
553 			if (err)
554 				return err;
555 		}
556 	}
557 
558 	switch (ch) {
559 		case ERR:
560 			break;
561 		case '\t':
562 			if (view->child) {
563 				*focus = view->child;
564 				view->child_focussed = 1;
565 			} else if (view->parent) {
566 				*focus = view->parent;
567 				view->parent->child_focussed = 0;
568 			}
569 			break;
570 		case 'q':
571 			err = view->input(new, dead, focus, view, ch);
572 			*dead = view;
573 			break;
574 		case 'Q':
575 			*done = 1;
576 			break;
577 		case 'f':
578 			if (view_is_parent_view(view)) {
579 				if (view->child == NULL)
580 					break;
581 				if (view_is_splitscreen(view->child)) {
582 					*focus = view->child;
583 					view->child_focussed = 1;
584 					err = view_fullscreen(view->child);
585 				} else
586 					err = view_splitscreen(view->child);
587 				if (err)
588 					break;
589 				err = view->child->input(new, dead, focus,
590 				    view->child, KEY_RESIZE);
591 			} else {
592 				if (view_is_splitscreen(view)) {
593 					*focus = view;
594 					view->parent->child_focussed = 1;
595 					err = view_fullscreen(view);
596 				} else {
597 					err = view_splitscreen(view);
598 				}
599 				if (err)
600 					break;
601 				err = view->input(new, dead, focus, view,
602 				    KEY_RESIZE);
603 			}
604 			break;
605 		case KEY_RESIZE:
606 			break;
607 		default:
608 			err = view->input(new, dead, focus, view, ch);
609 			break;
610 	}
611 
612 	return err;
613 }
614 
615 void
616 view_vborder(struct tog_view *view)
617 {
618 	PANEL *panel;
619 	struct tog_view *view_above;
620 
621 	if (view->parent)
622 		return view_vborder(view->parent);
623 
624 	panel = panel_above(view->panel);
625 	if (panel == NULL)
626 		return;
627 
628 	view_above = panel_userptr(panel);
629 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
630 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
631 }
632 
633 int
634 view_needs_focus_indication(struct tog_view *view)
635 {
636 	if (view_is_parent_view(view)) {
637 		if (view->child == NULL || view->child_focussed)
638 			return 0;
639 		if (!view_is_splitscreen(view->child))
640 			return 0;
641 	} else if (!view_is_splitscreen(view))
642 		return 0;
643 
644 	return view->focussed;
645 }
646 
647 static const struct got_error *
648 view_loop(struct tog_view *view)
649 {
650 	const struct got_error *err = NULL;
651 	struct tog_view_list_head views;
652 	struct tog_view *new_view, *dead_view, *focus_view, *main_view;
653 	int fast_refresh = 10;
654 	int done = 0, errcode;
655 
656 	errcode = pthread_mutex_lock(&tog_mutex);
657 	if (errcode)
658 		return got_error_set_errno(errcode);
659 
660 	TAILQ_INIT(&views);
661 	TAILQ_INSERT_HEAD(&views, view, entry);
662 
663 	main_view = view;
664 	view->focussed = 1;
665 	err = view->show(view);
666 	if (err)
667 		return err;
668 	update_panels();
669 	doupdate();
670 	while (!TAILQ_EMPTY(&views) && !done) {
671 		/* Refresh fast during initialization, then become slower. */
672 		if (fast_refresh && fast_refresh-- == 0)
673 			halfdelay(10); /* switch to once per second */
674 
675 		err = view_input(&new_view, &dead_view, &focus_view, &done,
676 		    view, &views);
677 		if (err)
678 			break;
679 		if (dead_view) {
680 			struct tog_view *prev = NULL;
681 
682 			if (view_is_parent_view(dead_view))
683 				prev = TAILQ_PREV(dead_view,
684 				    tog_view_list_head, entry);
685 			else if (view->parent != dead_view)
686 				prev = view->parent;
687 
688 			if (dead_view->parent)
689 				dead_view->parent->child = NULL;
690 			else
691 				TAILQ_REMOVE(&views, dead_view, entry);
692 
693 			err = view_close(dead_view);
694 			if (err || dead_view == main_view)
695 				goto done;
696 
697 			if (view == dead_view) {
698 				if (focus_view)
699 					view = focus_view;
700 				else if (prev)
701 					view = prev;
702 				else if (!TAILQ_EMPTY(&views))
703 					view = TAILQ_LAST(&views,
704 					    tog_view_list_head);
705 				else
706 					view = NULL;
707 				if (view) {
708 					if (view->child && view->child_focussed)
709 						focus_view = view->child;
710 					else
711 						focus_view = view;
712 				}
713 			}
714 		}
715 		if (new_view) {
716 			struct tog_view *v, *t;
717 			/* Only allow one parent view per type. */
718 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
719 				if (v->type != new_view->type)
720 					continue;
721 				TAILQ_REMOVE(&views, v, entry);
722 				err = view_close(v);
723 				if (err)
724 					goto done;
725 				break;
726 			}
727 			TAILQ_INSERT_TAIL(&views, new_view, entry);
728 			view = new_view;
729 			if (focus_view == NULL)
730 				focus_view = new_view;
731 		}
732 		if (focus_view) {
733 			show_panel(focus_view->panel);
734 			if (view)
735 				view->focussed = 0;
736 			focus_view->focussed = 1;
737 			view = focus_view;
738 			if (new_view)
739 				show_panel(new_view->panel);
740 			if (view->child && view_is_splitscreen(view->child))
741 				show_panel(view->child->panel);
742 		}
743 		if (view) {
744 			if (focus_view == NULL) {
745 				view->focussed = 1;
746 				show_panel(view->panel);
747 				if (view->child && view_is_splitscreen(view->child))
748 					show_panel(view->child->panel);
749 				focus_view = view;
750 			}
751 			if (view->parent) {
752 				err = view->parent->show(view->parent);
753 				if (err)
754 					goto done;
755 			}
756 			err = view->show(view);
757 			if (err)
758 				goto done;
759 			if (view->child) {
760 				err = view->child->show(view->child);
761 				if (err)
762 					goto done;
763 			}
764 			update_panels();
765 			doupdate();
766 		}
767 	}
768 done:
769 	while (!TAILQ_EMPTY(&views)) {
770 		view = TAILQ_FIRST(&views);
771 		TAILQ_REMOVE(&views, view, entry);
772 		view_close(view);
773 	}
774 
775 	errcode = pthread_mutex_unlock(&tog_mutex);
776 	if (errcode)
777 		return got_error_set_errno(errcode);
778 
779 	return err;
780 }
781 
782 __dead static void
783 usage_log(void)
784 {
785 	endwin();
786 	fprintf(stderr,
787 	    "usage: %s log [-c commit] [-r repository-path] [path]\n",
788 	    getprogname());
789 	exit(1);
790 }
791 
792 /* Create newly allocated wide-character string equivalent to a byte string. */
793 static const struct got_error *
794 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
795 {
796 	char *vis = NULL;
797 	const struct got_error *err = NULL;
798 
799 	*ws = NULL;
800 	*wlen = mbstowcs(NULL, s, 0);
801 	if (*wlen == (size_t)-1) {
802 		int vislen;
803 		if (errno != EILSEQ)
804 			return got_error_prefix_errno("mbstowcs");
805 
806 		/* byte string invalid in current encoding; try to "fix" it */
807 		err = got_mbsavis(&vis, &vislen, s);
808 		if (err)
809 			return err;
810 		*wlen = mbstowcs(NULL, vis, 0);
811 		if (*wlen == (size_t)-1) {
812 			err = got_error_prefix_errno("mbstowcs"); /* give up */
813 			goto done;
814 		}
815 	}
816 
817 	*ws = calloc(*wlen + 1, sizeof(*ws));
818 	if (*ws == NULL) {
819 		err = got_error_prefix_errno("calloc");
820 		goto done;
821 	}
822 
823 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
824 		err = got_error_prefix_errno("mbstowcs");
825 done:
826 	free(vis);
827 	if (err) {
828 		free(*ws);
829 		*ws = NULL;
830 		*wlen = 0;
831 	}
832 	return err;
833 }
834 
835 /* Format a line for display, ensuring that it won't overflow a width limit. */
836 static const struct got_error *
837 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
838 {
839 	const struct got_error *err = NULL;
840 	int cols = 0;
841 	wchar_t *wline = NULL;
842 	size_t wlen;
843 	int i;
844 
845 	*wlinep = NULL;
846 	*widthp = 0;
847 
848 	err = mbs2ws(&wline, &wlen, line);
849 	if (err)
850 		return err;
851 
852 	i = 0;
853 	while (i < wlen && cols < wlimit) {
854 		int width = wcwidth(wline[i]);
855 		switch (width) {
856 		case 0:
857 			i++;
858 			break;
859 		case 1:
860 		case 2:
861 			if (cols + width <= wlimit)
862 				cols += width;
863 			i++;
864 			break;
865 		case -1:
866 			if (wline[i] == L'\t')
867 				cols += TABSIZE - ((cols + 1) % TABSIZE);
868 			i++;
869 			break;
870 		default:
871 			err = got_error_prefix_errno("wcwidth");
872 			goto done;
873 		}
874 	}
875 	wline[i] = L'\0';
876 	if (widthp)
877 		*widthp = cols;
878 done:
879 	if (err)
880 		free(wline);
881 	else
882 		*wlinep = wline;
883 	return err;
884 }
885 
886 static const struct got_error*
887 build_refs_str(char **refs_str, struct got_reflist_head *refs,
888     struct got_object_id *id)
889 {
890 	static const struct got_error *err = NULL;
891 	struct got_reflist_entry *re;
892 	char *s;
893 	const char *name;
894 
895 	*refs_str = NULL;
896 
897 	SIMPLEQ_FOREACH(re, refs, entry) {
898 		if (got_object_id_cmp(re->id, id) != 0)
899 			continue;
900 		name = got_ref_get_name(re->ref);
901 		if (strcmp(name, GOT_REF_HEAD) == 0)
902 			continue;
903 		if (strncmp(name, "refs/", 5) == 0)
904 			name += 5;
905 		if (strncmp(name, "got/", 4) == 0)
906 			continue;
907 		if (strncmp(name, "heads/", 6) == 0)
908 			name += 6;
909 		if (strncmp(name, "remotes/", 8) == 0)
910 			name += 8;
911 		s = *refs_str;
912 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
913 		    s ? ", " : "", name) == -1) {
914 			err = got_error_prefix_errno("asprintf");
915 			free(s);
916 			*refs_str = NULL;
917 			break;
918 		}
919 		free(s);
920 	}
921 
922 	return err;
923 }
924 
925 static const struct got_error *
926 format_author(wchar_t **wauthor, int *author_width, char *author, int limit)
927 {
928 	char *smallerthan, *at;
929 
930 	smallerthan = strchr(author, '<');
931 	if (smallerthan && smallerthan[1] != '\0')
932 		author = smallerthan + 1;
933 	at = strchr(author, '@');
934 	if (at)
935 		*at = '\0';
936 	return format_line(wauthor, author_width, author, limit);
937 }
938 
939 static const struct got_error *
940 draw_commit(struct tog_view *view, struct got_commit_object *commit,
941     struct got_object_id *id, struct got_reflist_head *refs,
942     int author_display_cols)
943 {
944 	const struct got_error *err = NULL;
945 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
946 	char *logmsg0 = NULL, *logmsg = NULL;
947 	char *author = NULL;
948 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
949 	int author_width, logmsg_width;
950 	char *newline, *line = NULL;
951 	int col, limit;
952 	static const size_t date_display_cols = 9;
953 	const int avail = view->ncols;
954 	struct tm tm;
955 	time_t committer_time;
956 
957 	committer_time = got_object_commit_get_committer_time(commit);
958 	if (localtime_r(&committer_time, &tm) == NULL)
959 		return got_error_prefix_errno("localtime_r");
960 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
961 	    >= sizeof(datebuf))
962 		return got_error(GOT_ERR_NO_SPACE);
963 
964 	if (avail < date_display_cols)
965 		limit = MIN(sizeof(datebuf) - 1, avail);
966 	else
967 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
968 	waddnstr(view->window, datebuf, limit);
969 	col = limit + 1;
970 	if (col > avail)
971 		goto done;
972 
973 	author = strdup(got_object_commit_get_author(commit));
974 	if (author == NULL) {
975 		err = got_error_prefix_errno("strdup");
976 		goto done;
977 	}
978 	err = format_author(&wauthor, &author_width, author, avail - col);
979 	if (err)
980 		goto done;
981 	waddwstr(view->window, wauthor);
982 	col += author_width;
983 	while (col <= avail && author_width < author_display_cols + 2) {
984 		waddch(view->window, ' ');
985 		col++;
986 		author_width++;
987 	}
988 	if (col > avail)
989 		goto done;
990 
991 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
992 	if (logmsg0 == NULL) {
993 		err = got_error_prefix_errno("strdup");
994 		goto done;
995 	}
996 	logmsg = logmsg0;
997 	while (*logmsg == '\n')
998 		logmsg++;
999 	newline = strchr(logmsg, '\n');
1000 	if (newline)
1001 		*newline = '\0';
1002 	limit = avail - col;
1003 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
1004 	if (err)
1005 		goto done;
1006 	waddwstr(view->window, wlogmsg);
1007 	col += logmsg_width;
1008 	while (col <= avail) {
1009 		waddch(view->window, ' ');
1010 		col++;
1011 	}
1012 done:
1013 	free(logmsg0);
1014 	free(wlogmsg);
1015 	free(author);
1016 	free(wauthor);
1017 	free(line);
1018 	return err;
1019 }
1020 
1021 static struct commit_queue_entry *
1022 alloc_commit_queue_entry(struct got_commit_object *commit,
1023     struct got_object_id *id)
1024 {
1025 	struct commit_queue_entry *entry;
1026 
1027 	entry = calloc(1, sizeof(*entry));
1028 	if (entry == NULL)
1029 		return NULL;
1030 
1031 	entry->id = id;
1032 	entry->commit = commit;
1033 	return entry;
1034 }
1035 
1036 static void
1037 pop_commit(struct commit_queue *commits)
1038 {
1039 	struct commit_queue_entry *entry;
1040 
1041 	entry = TAILQ_FIRST(&commits->head);
1042 	TAILQ_REMOVE(&commits->head, entry, entry);
1043 	got_object_commit_close(entry->commit);
1044 	commits->ncommits--;
1045 	/* Don't free entry->id! It is owned by the commit graph. */
1046 	free(entry);
1047 }
1048 
1049 static void
1050 free_commits(struct commit_queue *commits)
1051 {
1052 	while (!TAILQ_EMPTY(&commits->head))
1053 		pop_commit(commits);
1054 }
1055 
1056 static const struct got_error *
1057 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
1058     int minqueue, struct got_repository *repo, const char *path)
1059 {
1060 	const struct got_error *err = NULL;
1061 	int nqueued = 0;
1062 
1063 	/*
1064 	 * We keep all commits open throughout the lifetime of the log
1065 	 * view in order to avoid having to re-fetch commits from disk
1066 	 * while updating the display.
1067 	 */
1068 	while (nqueued < minqueue) {
1069 		struct got_object_id *id;
1070 		struct got_commit_object *commit;
1071 		struct commit_queue_entry *entry;
1072 		int errcode;
1073 
1074 		err = got_commit_graph_iter_next(&id, graph);
1075 		if (err) {
1076 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1077 				break;
1078 			err = got_commit_graph_fetch_commits(graph,
1079 			    minqueue, repo);
1080 			if (err)
1081 				return err;
1082 			continue;
1083 		}
1084 
1085 		if (id == NULL)
1086 			break;
1087 
1088 		err = got_object_open_as_commit(&commit, repo, id);
1089 		if (err)
1090 			break;
1091 		entry = alloc_commit_queue_entry(commit, id);
1092 		if (entry == NULL) {
1093 			err = got_error_prefix_errno("alloc_commit_queue_entry");
1094 			break;
1095 		}
1096 
1097 		errcode = pthread_mutex_lock(&tog_mutex);
1098 		if (errcode) {
1099 			err = got_error_set_errno(errcode);
1100 			break;
1101 		}
1102 
1103 		entry->idx = commits->ncommits;
1104 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1105 		nqueued++;
1106 		commits->ncommits++;
1107 
1108 		errcode = pthread_mutex_unlock(&tog_mutex);
1109 		if (errcode && err == NULL)
1110 			err = got_error_set_errno(errcode);
1111 	}
1112 
1113 	return err;
1114 }
1115 
1116 static const struct got_error *
1117 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
1118 {
1119 	const struct got_error *err = NULL;
1120 	struct got_reference *head_ref;
1121 
1122 	*head_id = NULL;
1123 
1124 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1125 	if (err)
1126 		return err;
1127 
1128 	err = got_ref_resolve(head_id, repo, head_ref);
1129 	got_ref_close(head_ref);
1130 	if (err) {
1131 		*head_id = NULL;
1132 		return err;
1133 	}
1134 
1135 	return NULL;
1136 }
1137 
1138 static const struct got_error *
1139 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1140     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1141     struct commit_queue *commits, int selected_idx, int limit,
1142     struct got_reflist_head *refs, const char *path, int commits_needed)
1143 {
1144 	const struct got_error *err = NULL;
1145 	struct commit_queue_entry *entry;
1146 	int ncommits, width;
1147 	int author_cols = 10;
1148 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1149 	char *refs_str = NULL;
1150 	wchar_t *wline;
1151 
1152 	entry = first;
1153 	ncommits = 0;
1154 	while (entry) {
1155 		if (ncommits == selected_idx) {
1156 			*selected = entry;
1157 			break;
1158 		}
1159 		entry = TAILQ_NEXT(entry, entry);
1160 		ncommits++;
1161 	}
1162 
1163 	if (*selected) {
1164 		err = got_object_id_str(&id_str, (*selected)->id);
1165 		if (err)
1166 			return err;
1167 		if (refs) {
1168 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1169 			if (err)
1170 				goto done;
1171 		}
1172 	}
1173 
1174 	if (commits_needed == 0)
1175 		halfdelay(10); /* disable fast refresh */
1176 
1177 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1178 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1179 	    commits_needed > 0 ? "loading... " :
1180 	    (refs_str ? refs_str : "")) == -1) {
1181 		err = got_error_prefix_errno("asprintf");
1182 		goto done;
1183 	}
1184 
1185 	if (path && strcmp(path, "/") != 0) {
1186 		if (asprintf(&header, "commit %s %s%s",
1187 		    id_str ? id_str : "........................................",
1188 		    path, ncommits_str) == -1) {
1189 			err = got_error_prefix_errno("asprintf");
1190 			header = NULL;
1191 			goto done;
1192 		}
1193 	} else if (asprintf(&header, "commit %s%s",
1194 	    id_str ? id_str : "........................................",
1195 	    ncommits_str) == -1) {
1196 		err = got_error_prefix_errno("asprintf");
1197 		header = NULL;
1198 		goto done;
1199 	}
1200 	err = format_line(&wline, &width, header, view->ncols);
1201 	if (err)
1202 		goto done;
1203 
1204 	werase(view->window);
1205 
1206 	if (view_needs_focus_indication(view))
1207 		wstandout(view->window);
1208 	waddwstr(view->window, wline);
1209 	while (width < view->ncols) {
1210 		waddch(view->window, ' ');
1211 		width++;
1212 	}
1213 	if (view_needs_focus_indication(view))
1214 		wstandend(view->window);
1215 	free(wline);
1216 	if (limit <= 1)
1217 		goto done;
1218 
1219 	/* Grow author column size if necessary. */
1220 	entry = first;
1221 	ncommits = 0;
1222 	while (entry) {
1223 		char *author;
1224 		wchar_t *wauthor;
1225 		int width;
1226 		if (ncommits >= limit - 1)
1227 			break;
1228 		author = strdup(got_object_commit_get_author(entry->commit));
1229 		if (author == NULL) {
1230 			err = got_error_prefix_errno("strdup");
1231 			goto done;
1232 		}
1233 		err = format_author(&wauthor, &width, author, COLS);
1234 		if (author_cols < width)
1235 			author_cols = width;
1236 		free(wauthor);
1237 		free(author);
1238 		entry = TAILQ_NEXT(entry, entry);
1239 	}
1240 
1241 	entry = first;
1242 	*last = first;
1243 	ncommits = 0;
1244 	while (entry) {
1245 		if (ncommits >= limit - 1)
1246 			break;
1247 		if (ncommits == selected_idx)
1248 			wstandout(view->window);
1249 		err = draw_commit(view, entry->commit, entry->id, refs,
1250 		    author_cols);
1251 		if (ncommits == selected_idx)
1252 			wstandend(view->window);
1253 		if (err)
1254 			break;
1255 		ncommits++;
1256 		*last = entry;
1257 		entry = TAILQ_NEXT(entry, entry);
1258 	}
1259 
1260 	view_vborder(view);
1261 done:
1262 	free(id_str);
1263 	free(refs_str);
1264 	free(ncommits_str);
1265 	free(header);
1266 	return err;
1267 }
1268 
1269 static void
1270 scroll_up(struct tog_view *view,
1271     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1272     struct commit_queue *commits)
1273 {
1274 	struct commit_queue_entry *entry;
1275 	int nscrolled = 0;
1276 
1277 	entry = TAILQ_FIRST(&commits->head);
1278 	if (*first_displayed_entry == entry) {
1279 		view_flash(view);
1280 		return;
1281 	}
1282 
1283 	entry = *first_displayed_entry;
1284 	while (entry && nscrolled < maxscroll) {
1285 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1286 		if (entry) {
1287 			*first_displayed_entry = entry;
1288 			nscrolled++;
1289 		}
1290 	}
1291 }
1292 
1293 static const struct got_error *
1294 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1295     pthread_cond_t *need_commits)
1296 {
1297 	int errcode;
1298 	int max_wait = 20;
1299 
1300 	halfdelay(1); /* fast refresh while loading commits */
1301 
1302 	while (*commits_needed > 0) {
1303 		if (*log_complete)
1304 			break;
1305 
1306 		/* Wake the log thread. */
1307 		errcode = pthread_cond_signal(need_commits);
1308 		if (errcode)
1309 			return got_error_set_errno(errcode);
1310 		errcode = pthread_mutex_unlock(&tog_mutex);
1311 		if (errcode)
1312 			return got_error_set_errno(errcode);
1313 		pthread_yield();
1314 		errcode = pthread_mutex_lock(&tog_mutex);
1315 		if (errcode)
1316 			return got_error_set_errno(errcode);
1317 
1318 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1319 			/*
1320 			 * Thread is not done yet; lose a key press
1321 			 * and let the user retry... this way the GUI
1322 			 * remains interactive while logging deep paths
1323 			 * with few commits in history.
1324 			 */
1325 			return NULL;
1326 		}
1327 	}
1328 
1329 	return NULL;
1330 }
1331 
1332 static const struct got_error *
1333 scroll_down(struct tog_view *view,
1334     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1335     struct commit_queue_entry **last_displayed_entry,
1336     struct commit_queue *commits, int *log_complete, int *commits_needed,
1337     pthread_cond_t *need_commits)
1338 {
1339 	const struct got_error *err = NULL;
1340 	struct commit_queue_entry *pentry;
1341 	int nscrolled = 0;
1342 
1343 	if (*last_displayed_entry == NULL)
1344 		return NULL;
1345 
1346 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1347 	if (pentry == NULL && !*log_complete) {
1348 		/*
1349 		 * Ask the log thread for required amount of commits
1350 		 * plus some amount of pre-fetching.
1351 		 */
1352 		(*commits_needed) += maxscroll + 20;
1353 		err = trigger_log_thread(0, commits_needed, log_complete,
1354 		    need_commits);
1355 		if (err)
1356 			return err;
1357 	}
1358 
1359 	do {
1360 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1361 		if (pentry == NULL) {
1362 			if (*log_complete)
1363 				view_flash(view);
1364 			break;
1365 		}
1366 
1367 		*last_displayed_entry = pentry;
1368 
1369 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1370 		if (pentry == NULL)
1371 			break;
1372 		*first_displayed_entry = pentry;
1373 	} while (++nscrolled < maxscroll);
1374 
1375 	return err;
1376 }
1377 
1378 static const struct got_error *
1379 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1380     struct got_commit_object *commit, struct got_object_id *commit_id,
1381     struct tog_view *log_view, struct got_reflist_head *refs,
1382     struct got_repository *repo)
1383 {
1384 	const struct got_error *err;
1385 	struct got_object_qid *parent_id;
1386 	struct tog_view *diff_view;
1387 
1388 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1389 	if (diff_view == NULL)
1390 		return got_error_prefix_errno("view_open");
1391 
1392 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1393 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1394 	    commit_id, log_view, refs, repo);
1395 	if (err == NULL)
1396 		*new_view = diff_view;
1397 	return err;
1398 }
1399 
1400 static const struct got_error *
1401 browse_commit(struct tog_view **new_view, int begin_x,
1402     struct commit_queue_entry *entry, struct got_reflist_head *refs,
1403     struct got_repository *repo)
1404 {
1405 	const struct got_error *err = NULL;
1406 	struct got_tree_object *tree;
1407 	struct tog_view *tree_view;
1408 
1409 	err = got_object_open_as_tree(&tree, repo,
1410 	    got_object_commit_get_tree_id(entry->commit));
1411 	if (err)
1412 		return err;
1413 
1414 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1415 	if (tree_view == NULL)
1416 		return got_error_prefix_errno("view_open");
1417 
1418 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1419 	if (err)
1420 		got_object_tree_close(tree);
1421 	else
1422 		*new_view = tree_view;
1423 	return err;
1424 }
1425 
1426 static void *
1427 log_thread(void *arg)
1428 {
1429 	const struct got_error *err = NULL;
1430 	int errcode = 0;
1431 	struct tog_log_thread_args *a = arg;
1432 	int done = 0;
1433 
1434 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1435 	if (err)
1436 		return (void *)err;
1437 
1438 	while (!done && !err) {
1439 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1440 		    a->in_repo_path);
1441 		if (err) {
1442 			if (err->code != GOT_ERR_ITER_COMPLETED)
1443 				return (void *)err;
1444 			err = NULL;
1445 			done = 1;
1446 		} else if (a->commits_needed > 0)
1447 			a->commits_needed--;
1448 
1449 		errcode = pthread_mutex_lock(&tog_mutex);
1450 		if (errcode) {
1451 			err = got_error_set_errno(errcode);
1452 			break;
1453 		} else if (*a->quit)
1454 			done = 1;
1455 		else if (*a->first_displayed_entry == NULL) {
1456 			*a->first_displayed_entry =
1457 			    TAILQ_FIRST(&a->commits->head);
1458 			*a->selected_entry = *a->first_displayed_entry;
1459 		}
1460 
1461 		if (done)
1462 			a->commits_needed = 0;
1463 		else if (a->commits_needed == 0) {
1464 			errcode = pthread_cond_wait(&a->need_commits,
1465 			    &tog_mutex);
1466 			if (errcode)
1467 				err = got_error_set_errno(errcode);
1468 		}
1469 
1470 		errcode = pthread_mutex_unlock(&tog_mutex);
1471 		if (errcode && err == NULL)
1472 			err = got_error_set_errno(errcode);
1473 	}
1474 	a->log_complete = 1;
1475 	return (void *)err;
1476 }
1477 
1478 static const struct got_error *
1479 stop_log_thread(struct tog_log_view_state *s)
1480 {
1481 	const struct got_error *err = NULL;
1482 	int errcode;
1483 
1484 	if (s->thread) {
1485 		s->quit = 1;
1486 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1487 		if (errcode)
1488 			return got_error_set_errno(errcode);
1489 		errcode = pthread_mutex_unlock(&tog_mutex);
1490 		if (errcode)
1491 			return got_error_set_errno(errcode);
1492 		errcode = pthread_join(s->thread, (void **)&err);
1493 		if (errcode)
1494 			return got_error_set_errno(errcode);
1495 		errcode = pthread_mutex_lock(&tog_mutex);
1496 		if (errcode)
1497 			return got_error_set_errno(errcode);
1498 		s->thread = NULL;
1499 	}
1500 
1501 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1502 	if (errcode && err == NULL)
1503 		err = got_error_set_errno(errcode);
1504 
1505 	if (s->thread_args.repo) {
1506 		got_repo_close(s->thread_args.repo);
1507 		s->thread_args.repo = NULL;
1508 	}
1509 
1510 	if (s->thread_args.graph) {
1511 		got_commit_graph_close(s->thread_args.graph);
1512 		s->thread_args.graph = NULL;
1513 	}
1514 
1515 	return err;
1516 }
1517 
1518 static const struct got_error *
1519 close_log_view(struct tog_view *view)
1520 {
1521 	const struct got_error *err = NULL;
1522 	struct tog_log_view_state *s = &view->state.log;
1523 
1524 	err = stop_log_thread(s);
1525 	free_commits(&s->commits);
1526 	free(s->in_repo_path);
1527 	s->in_repo_path = NULL;
1528 	free(s->start_id);
1529 	s->start_id = NULL;
1530 	return err;
1531 }
1532 
1533 static const struct got_error *
1534 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1535     struct got_reflist_head *refs, struct got_repository *repo,
1536     const char *path, int check_disk)
1537 {
1538 	const struct got_error *err = NULL;
1539 	struct tog_log_view_state *s = &view->state.log;
1540 	struct got_repository *thread_repo = NULL;
1541 	struct got_commit_graph *thread_graph = NULL;
1542 	int errcode;
1543 
1544 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1545 	if (err != NULL)
1546 		goto done;
1547 
1548 	/* The commit queue only contains commits being displayed. */
1549 	TAILQ_INIT(&s->commits.head);
1550 	s->commits.ncommits = 0;
1551 
1552 	s->refs = refs;
1553 	s->repo = repo;
1554 	s->start_id = got_object_id_dup(start_id);
1555 	if (s->start_id == NULL) {
1556 		err = got_error_prefix_errno("got_object_id_dup");
1557 		goto done;
1558 	}
1559 
1560 	view->show = show_log_view;
1561 	view->input = input_log_view;
1562 	view->close = close_log_view;
1563 
1564 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1565 	if (err)
1566 		goto done;
1567 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1568 	    0, thread_repo);
1569 	if (err)
1570 		goto done;
1571 
1572 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1573 	if (errcode) {
1574 		err = got_error_set_errno(errcode);
1575 		goto done;
1576 	}
1577 
1578 	s->thread_args.commits_needed = view->nlines;
1579 	s->thread_args.graph = thread_graph;
1580 	s->thread_args.commits = &s->commits;
1581 	s->thread_args.in_repo_path = s->in_repo_path;
1582 	s->thread_args.start_id = s->start_id;
1583 	s->thread_args.repo = thread_repo;
1584 	s->thread_args.log_complete = 0;
1585 	s->thread_args.quit = &s->quit;
1586 	s->thread_args.view = view;
1587 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1588 	s->thread_args.selected_entry = &s->selected_entry;
1589 done:
1590 	if (err)
1591 		close_log_view(view);
1592 	return err;
1593 }
1594 
1595 static const struct got_error *
1596 show_log_view(struct tog_view *view)
1597 {
1598 	struct tog_log_view_state *s = &view->state.log;
1599 
1600 	if (s->thread == NULL) {
1601 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1602 		    &s->thread_args);
1603 		if (errcode)
1604 			return got_error_set_errno(errcode);
1605 	}
1606 
1607 	return draw_commits(view, &s->last_displayed_entry,
1608 	    &s->selected_entry, s->first_displayed_entry,
1609 	    &s->commits, s->selected, view->nlines, s->refs,
1610 	    s->in_repo_path, s->thread_args.commits_needed);
1611 }
1612 
1613 static const struct got_error *
1614 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1615     struct tog_view **focus_view, struct tog_view *view, int ch)
1616 {
1617 	const struct got_error *err = NULL;
1618 	struct tog_log_view_state *s = &view->state.log;
1619 	char *parent_path;
1620 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1621 	int begin_x = 0;
1622 
1623 	switch (ch) {
1624 		case 'q':
1625 			s->quit = 1;
1626 			break;
1627 		case 'k':
1628 		case KEY_UP:
1629 		case '<':
1630 		case ',':
1631 			if (s->first_displayed_entry == NULL)
1632 				break;
1633 			if (s->selected > 0)
1634 				s->selected--;
1635 			if (s->selected > 0)
1636 				break;
1637 			scroll_up(view, &s->first_displayed_entry, 1,
1638 			    &s->commits);
1639 			break;
1640 		case KEY_PPAGE:
1641 			if (s->first_displayed_entry == NULL)
1642 				break;
1643 			if (TAILQ_FIRST(&s->commits.head) ==
1644 			    s->first_displayed_entry) {
1645 				if (s->selected == 0) {
1646 					view_flash(view);
1647 					break;
1648 				}
1649 				s->selected = 0;
1650 				break;
1651 			}
1652 			scroll_up(view, &s->first_displayed_entry,
1653 			    view->nlines, &s->commits);
1654 			break;
1655 		case 'j':
1656 		case KEY_DOWN:
1657 		case '>':
1658 		case '.':
1659 			if (s->first_displayed_entry == NULL)
1660 				break;
1661 			if (s->selected < MIN(view->nlines - 2,
1662 			    s->commits.ncommits - 1)) {
1663 				s->selected++;
1664 				break;
1665 			}
1666 			err = scroll_down(view, &s->first_displayed_entry, 1,
1667 			    &s->last_displayed_entry, &s->commits,
1668 			    &s->thread_args.log_complete,
1669 			    &s->thread_args.commits_needed,
1670 			    &s->thread_args.need_commits);
1671 			break;
1672 		case KEY_NPAGE: {
1673 			struct commit_queue_entry *first;
1674 			first = s->first_displayed_entry;
1675 			if (first == NULL)
1676 				break;
1677 			err = scroll_down(view, &s->first_displayed_entry,
1678 			    view->nlines, &s->last_displayed_entry,
1679 			    &s->commits, &s->thread_args.log_complete,
1680 			    &s->thread_args.commits_needed,
1681 			    &s->thread_args.need_commits);
1682 			if (first == s->first_displayed_entry &&
1683 			    s->selected < MIN(view->nlines - 2,
1684 			    s->commits.ncommits - 1)) {
1685 				/* can't scroll further down */
1686 				s->selected = MIN(view->nlines - 2,
1687 				    s->commits.ncommits - 1);
1688 			}
1689 			err = NULL;
1690 			break;
1691 		}
1692 		case KEY_RESIZE:
1693 			if (s->selected > view->nlines - 2)
1694 				s->selected = view->nlines - 2;
1695 			if (s->selected > s->commits.ncommits - 1)
1696 				s->selected = s->commits.ncommits - 1;
1697 			break;
1698 		case KEY_ENTER:
1699 		case '\r':
1700 			if (s->selected_entry == NULL)
1701 				break;
1702 			if (view_is_parent_view(view))
1703 				begin_x = view_split_begin_x(view->begin_x);
1704 			err = open_diff_view_for_commit(&diff_view, begin_x,
1705 			    s->selected_entry->commit, s->selected_entry->id,
1706 			    view, s->refs, s->repo);
1707 			if (err)
1708 				break;
1709 			if (view_is_parent_view(view)) {
1710 				err = view_close_child(view);
1711 				if (err)
1712 					return err;
1713 				err = view_set_child(view, diff_view);
1714 				if (err) {
1715 					view_close(diff_view);
1716 					break;
1717 				}
1718 				*focus_view = diff_view;
1719 				view->child_focussed = 1;
1720 			} else
1721 				*new_view = diff_view;
1722 			break;
1723 		case 't':
1724 			if (s->selected_entry == NULL)
1725 				break;
1726 			if (view_is_parent_view(view))
1727 				begin_x = view_split_begin_x(view->begin_x);
1728 			err = browse_commit(&tree_view, begin_x,
1729 			    s->selected_entry, s->refs, s->repo);
1730 			if (err)
1731 				break;
1732 			if (view_is_parent_view(view)) {
1733 				err = view_close_child(view);
1734 				if (err)
1735 					return err;
1736 				err = view_set_child(view, tree_view);
1737 				if (err) {
1738 					view_close(tree_view);
1739 					break;
1740 				}
1741 				*focus_view = tree_view;
1742 				view->child_focussed = 1;
1743 			} else
1744 				*new_view = tree_view;
1745 			break;
1746 		case KEY_BACKSPACE:
1747 			if (strcmp(s->in_repo_path, "/") == 0)
1748 				break;
1749 			parent_path = dirname(s->in_repo_path);
1750 			if (parent_path && strcmp(parent_path, ".") != 0) {
1751 				struct tog_view *lv;
1752 				err = stop_log_thread(s);
1753 				if (err)
1754 					return err;
1755 				lv = view_open(view->nlines, view->ncols,
1756 				    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1757 				if (lv == NULL)
1758 					return got_error_prefix_errno(
1759 					    "view_open");
1760 				err = open_log_view(lv, s->start_id, s->refs,
1761 				    s->repo, parent_path, 0);
1762 				if (err)
1763 					return err;;
1764 				if (view_is_parent_view(view))
1765 					*new_view = lv;
1766 				else {
1767 					view_set_child(view->parent, lv);
1768 					*focus_view = lv;
1769 				}
1770 				return NULL;
1771 			}
1772 			break;
1773 		default:
1774 			break;
1775 	}
1776 
1777 	return err;
1778 }
1779 
1780 static const struct got_error *
1781 apply_unveil(const char *repo_path, const char *worktree_path)
1782 {
1783 	const struct got_error *error;
1784 
1785 	if (repo_path && unveil(repo_path, "r") != 0)
1786 		return got_error_prefix_errno2("unveil", repo_path);
1787 
1788 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1789 		return got_error_prefix_errno2("unveil", worktree_path);
1790 
1791 	if (unveil("/tmp", "rwc") != 0)
1792 		return got_error_prefix_errno2("unveil", "/tmp");
1793 
1794 	error = got_privsep_unveil_exec_helpers();
1795 	if (error != NULL)
1796 		return error;
1797 
1798 	if (unveil(NULL, NULL) != 0)
1799 		return got_error_prefix_errno("unveil");
1800 
1801 	return NULL;
1802 }
1803 
1804 static void
1805 init_curses(void)
1806 {
1807 	initscr();
1808 	cbreak();
1809 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1810 	noecho();
1811 	nonl();
1812 	intrflush(stdscr, FALSE);
1813 	keypad(stdscr, TRUE);
1814 	curs_set(0);
1815 	signal(SIGWINCH, tog_sigwinch);
1816 }
1817 
1818 static const struct got_error *
1819 cmd_log(int argc, char *argv[])
1820 {
1821 	const struct got_error *error;
1822 	struct got_repository *repo = NULL;
1823 	struct got_worktree *worktree = NULL;
1824 	struct got_reflist_head refs;
1825 	struct got_object_id *start_id = NULL;
1826 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1827 	char *start_commit = NULL;
1828 	int ch;
1829 	struct tog_view *view;
1830 
1831 	SIMPLEQ_INIT(&refs);
1832 
1833 #ifndef PROFILE
1834 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1835 	    NULL) == -1)
1836 		err(1, "pledge");
1837 #endif
1838 
1839 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1840 		switch (ch) {
1841 		case 'c':
1842 			start_commit = optarg;
1843 			break;
1844 		case 'r':
1845 			repo_path = realpath(optarg, NULL);
1846 			if (repo_path == NULL)
1847 				err(1, "-r option");
1848 			break;
1849 		default:
1850 			usage_log();
1851 			/* NOTREACHED */
1852 		}
1853 	}
1854 
1855 	argc -= optind;
1856 	argv += optind;
1857 
1858 	cwd = getcwd(NULL, 0);
1859 	if (cwd == NULL) {
1860 		error = got_error_prefix_errno("getcwd");
1861 		goto done;
1862 	}
1863 	error = got_worktree_open(&worktree, cwd);
1864 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
1865 		goto done;
1866 	error = NULL;
1867 
1868 	if (argc == 0) {
1869 		path = strdup("");
1870 		if (path == NULL) {
1871 			error = got_error_prefix_errno("strdup");
1872 			goto done;
1873 		}
1874 	} else if (argc == 1) {
1875 		if (worktree) {
1876 			error = got_worktree_resolve_path(&path, worktree,
1877 			    argv[0]);
1878 			if (error)
1879 				goto done;
1880 		} else {
1881 			path = strdup(argv[0]);
1882 			if (path == NULL) {
1883 				error = got_error_prefix_errno("strdup");
1884 				goto done;
1885 			}
1886 		}
1887 	} else
1888 		usage_log();
1889 
1890 	repo_path = worktree ?
1891 	    strdup(got_worktree_get_repo_path(worktree)) : strdup(cwd);
1892 	if (repo_path == NULL) {
1893 		error = got_error_prefix_errno("strdup");
1894 		goto done;
1895 	}
1896 
1897 	init_curses();
1898 
1899 	error = got_repo_open(&repo, repo_path);
1900 	if (error != NULL)
1901 		goto done;
1902 
1903 	error = apply_unveil(got_repo_get_path(repo),
1904 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1905 	if (error)
1906 		goto done;
1907 
1908 	if (start_commit == NULL)
1909 		error = get_head_commit_id(&start_id, repo);
1910 	else
1911 		error = got_object_resolve_id_str(&start_id, repo,
1912 		    start_commit);
1913 	if (error != NULL)
1914 		goto done;
1915 
1916 	error = got_ref_list(&refs, repo);
1917 	if (error)
1918 		goto done;
1919 
1920 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1921 	if (view == NULL) {
1922 		error = got_error_prefix_errno("view_open");
1923 		goto done;
1924 	}
1925 	error = open_log_view(view, start_id, &refs, repo, path, 1);
1926 	if (error)
1927 		goto done;
1928 	error = view_loop(view);
1929 done:
1930 	free(repo_path);
1931 	free(cwd);
1932 	free(path);
1933 	free(start_id);
1934 	if (repo)
1935 		got_repo_close(repo);
1936 	if (worktree)
1937 		got_worktree_close(worktree);
1938 	got_ref_list_free(&refs);
1939 	return error;
1940 }
1941 
1942 __dead static void
1943 usage_diff(void)
1944 {
1945 	endwin();
1946 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1947 	    getprogname());
1948 	exit(1);
1949 }
1950 
1951 static char *
1952 parse_next_line(FILE *f, size_t *len)
1953 {
1954 	char *line;
1955 	size_t linelen;
1956 	size_t lineno;
1957 	const char delim[3] = { '\0', '\0', '\0'};
1958 
1959 	line = fparseln(f, &linelen, &lineno, delim, 0);
1960 	if (len)
1961 		*len = linelen;
1962 	return line;
1963 }
1964 
1965 static const struct got_error *
1966 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1967     int *last_displayed_line, int *eof, int max_lines,
1968     char * header)
1969 {
1970 	const struct got_error *err;
1971 	int nlines = 0, nprinted = 0;
1972 	char *line;
1973 	size_t len;
1974 	wchar_t *wline;
1975 	int width;
1976 
1977 	rewind(f);
1978 	werase(view->window);
1979 
1980 	if (header) {
1981 		err = format_line(&wline, &width, header, view->ncols);
1982 		if (err) {
1983 			return err;
1984 		}
1985 
1986 		if (view_needs_focus_indication(view))
1987 			wstandout(view->window);
1988 		waddwstr(view->window, wline);
1989 		if (view_needs_focus_indication(view))
1990 			wstandend(view->window);
1991 		if (width < view->ncols)
1992 			waddch(view->window, '\n');
1993 
1994 		if (max_lines <= 1)
1995 			return NULL;
1996 		max_lines--;
1997 	}
1998 
1999 	*eof = 0;
2000 	while (nprinted < max_lines) {
2001 		line = parse_next_line(f, &len);
2002 		if (line == NULL) {
2003 			*eof = 1;
2004 			break;
2005 		}
2006 		if (++nlines < *first_displayed_line) {
2007 			free(line);
2008 			continue;
2009 		}
2010 
2011 		err = format_line(&wline, &width, line, view->ncols);
2012 		if (err) {
2013 			free(line);
2014 			return err;
2015 		}
2016 		waddwstr(view->window, wline);
2017 		if (width < view->ncols)
2018 			waddch(view->window, '\n');
2019 		if (++nprinted == 1)
2020 			*first_displayed_line = nlines;
2021 		free(line);
2022 		free(wline);
2023 		wline = NULL;
2024 	}
2025 	*last_displayed_line = nlines;
2026 
2027 	view_vborder(view);
2028 
2029 	return NULL;
2030 }
2031 
2032 static char *
2033 get_datestr(time_t *time, char *datebuf)
2034 {
2035 	char *p, *s = ctime_r(time, datebuf);
2036 	p = strchr(s, '\n');
2037 	if (p)
2038 		*p = '\0';
2039 	return s;
2040 }
2041 
2042 static const struct got_error *
2043 write_commit_info(struct got_object_id *commit_id,
2044     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2045 {
2046 	const struct got_error *err = NULL;
2047 	char datebuf[26];
2048 	struct got_commit_object *commit;
2049 	char *id_str = NULL;
2050 	time_t committer_time;
2051 	const char *author, *committer;
2052 	char *refs_str = NULL;
2053 
2054 	if (refs) {
2055 		err = build_refs_str(&refs_str, refs, commit_id);
2056 		if (err)
2057 			return err;
2058 	}
2059 
2060 	err = got_object_open_as_commit(&commit, repo, commit_id);
2061 	if (err)
2062 		return err;
2063 
2064 	err = got_object_id_str(&id_str, commit_id);
2065 	if (err) {
2066 		err = got_error_prefix_errno("got_object_id_str");
2067 		goto done;
2068 	}
2069 
2070 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2071 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2072 		err = got_error_prefix_errno("fprintf");
2073 		goto done;
2074 	}
2075 	if (fprintf(outfile, "from: %s\n",
2076 	    got_object_commit_get_author(commit)) < 0) {
2077 		err = got_error_prefix_errno("fprintf");
2078 		goto done;
2079 	}
2080 	committer_time = got_object_commit_get_committer_time(commit);
2081 	if (fprintf(outfile, "date: %s UTC\n",
2082 	    get_datestr(&committer_time, datebuf)) < 0) {
2083 		err = got_error_prefix_errno("fprintf");
2084 		goto done;
2085 	}
2086 	author = got_object_commit_get_author(commit);
2087 	committer = got_object_commit_get_committer(commit);
2088 	if (strcmp(author, committer) != 0 &&
2089 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2090 		err = got_error_prefix_errno("fprintf");
2091 		goto done;
2092 	}
2093 	if (fprintf(outfile, "%s\n",
2094 	    got_object_commit_get_logmsg(commit)) < 0) {
2095 		err = got_error_prefix_errno("fprintf");
2096 		goto done;
2097 	}
2098 done:
2099 	free(id_str);
2100 	free(refs_str);
2101 	got_object_commit_close(commit);
2102 	return err;
2103 }
2104 
2105 static const struct got_error *
2106 create_diff(struct tog_diff_view_state *s)
2107 {
2108 	const struct got_error *err = NULL;
2109 	FILE *f = NULL;
2110 	int obj_type;
2111 
2112 	f = got_opentemp();
2113 	if (f == NULL) {
2114 		err = got_error_prefix_errno("got_opentemp");
2115 		goto done;
2116 	}
2117 	if (s->f && fclose(s->f) != 0) {
2118 		err = got_error_prefix_errno("fclose");
2119 		goto done;
2120 	}
2121 	s->f = f;
2122 
2123 	if (s->id1)
2124 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2125 	else
2126 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2127 	if (err)
2128 		goto done;
2129 
2130 	switch (obj_type) {
2131 	case GOT_OBJ_TYPE_BLOB:
2132 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2133 		    s->diff_context, s->repo, f);
2134 		break;
2135 	case GOT_OBJ_TYPE_TREE:
2136 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2137 		    s->diff_context, s->repo, f);
2138 		break;
2139 	case GOT_OBJ_TYPE_COMMIT: {
2140 		const struct got_object_id_queue *parent_ids;
2141 		struct got_object_qid *pid;
2142 		struct got_commit_object *commit2;
2143 
2144 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2145 		if (err)
2146 			break;
2147 		/* Show commit info if we're diffing to a parent/root commit. */
2148 		if (s->id1 == NULL)
2149 			write_commit_info(s->id2, s->refs, s->repo, f);
2150 		else {
2151 			parent_ids = got_object_commit_get_parent_ids(commit2);
2152 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2153 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2154 					write_commit_info(s->id2, s->refs,
2155 					    s->repo, f);
2156 					break;
2157 				}
2158 			}
2159 		}
2160 		got_object_commit_close(commit2);
2161 
2162 		err = got_diff_objects_as_commits(s->id1, s->id2,
2163 		    s->diff_context, s->repo, f);
2164 		break;
2165 	}
2166 	default:
2167 		err = got_error(GOT_ERR_OBJ_TYPE);
2168 		break;
2169 	}
2170 done:
2171 	if (f && fflush(f) != 0 && err == NULL)
2172 		err = got_error_prefix_errno("fflush");
2173 	return err;
2174 }
2175 
2176 static void
2177 diff_view_indicate_progress(struct tog_view *view)
2178 {
2179 	werase(view->window);
2180 	waddstr(view->window, "diffing...");
2181 	update_panels();
2182 	doupdate();
2183 }
2184 
2185 static const struct got_error *
2186 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2187     struct got_object_id *id2, struct tog_view *log_view,
2188     struct got_reflist_head *refs, struct got_repository *repo)
2189 {
2190 	const struct got_error *err;
2191 
2192 	if (id1 != NULL && id2 != NULL) {
2193 	    int type1, type2;
2194 	    err = got_object_get_type(&type1, repo, id1);
2195 	    if (err)
2196 		return err;
2197 	    err = got_object_get_type(&type2, repo, id2);
2198 	    if (err)
2199 		return err;
2200 
2201 	    if (type1 != type2)
2202 		return got_error(GOT_ERR_OBJ_TYPE);
2203 	}
2204 
2205 	if (id1) {
2206 		view->state.diff.id1 = got_object_id_dup(id1);
2207 		if (view->state.diff.id1 == NULL)
2208 			return got_error_prefix_errno("got_object_id_dup");
2209 	} else
2210 		view->state.diff.id1 = NULL;
2211 
2212 	view->state.diff.id2 = got_object_id_dup(id2);
2213 	if (view->state.diff.id2 == NULL) {
2214 		free(view->state.diff.id1);
2215 		view->state.diff.id1 = NULL;
2216 		return got_error_prefix_errno("got_object_id_dup");
2217 	}
2218 	view->state.diff.f = NULL;
2219 	view->state.diff.first_displayed_line = 1;
2220 	view->state.diff.last_displayed_line = view->nlines;
2221 	view->state.diff.diff_context = 3;
2222 	view->state.diff.log_view = log_view;
2223 	view->state.diff.repo = repo;
2224 	view->state.diff.refs = refs;
2225 
2226 	if (log_view && view_is_splitscreen(view))
2227 		show_log_view(log_view); /* draw vborder */
2228 	diff_view_indicate_progress(view);
2229 
2230 	err = create_diff(&view->state.diff);
2231 	if (err) {
2232 		free(view->state.diff.id1);
2233 		view->state.diff.id1 = NULL;
2234 		free(view->state.diff.id2);
2235 		view->state.diff.id2 = NULL;
2236 		return err;
2237 	}
2238 
2239 	view->show = show_diff_view;
2240 	view->input = input_diff_view;
2241 	view->close = close_diff_view;
2242 
2243 	return NULL;
2244 }
2245 
2246 static const struct got_error *
2247 close_diff_view(struct tog_view *view)
2248 {
2249 	const struct got_error *err = NULL;
2250 
2251 	free(view->state.diff.id1);
2252 	view->state.diff.id1 = NULL;
2253 	free(view->state.diff.id2);
2254 	view->state.diff.id2 = NULL;
2255 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2256 		err = got_error_prefix_errno("fclose");
2257 	return err;
2258 }
2259 
2260 static const struct got_error *
2261 show_diff_view(struct tog_view *view)
2262 {
2263 	const struct got_error *err;
2264 	struct tog_diff_view_state *s = &view->state.diff;
2265 	char *id_str1 = NULL, *id_str2, *header;
2266 
2267 	if (s->id1) {
2268 		err = got_object_id_str(&id_str1, s->id1);
2269 		if (err)
2270 			return err;
2271 	}
2272 	err = got_object_id_str(&id_str2, s->id2);
2273 	if (err)
2274 		return err;
2275 
2276 	if (asprintf(&header, "diff %s %s",
2277 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2278 		err = got_error_prefix_errno("asprintf");
2279 		free(id_str1);
2280 		free(id_str2);
2281 		return err;
2282 	}
2283 	free(id_str1);
2284 	free(id_str2);
2285 
2286 	return draw_file(view, s->f, &s->first_displayed_line,
2287 	    &s->last_displayed_line, &s->eof, view->nlines,
2288 	    header);
2289 }
2290 
2291 static const struct got_error *
2292 set_selected_commit(struct tog_diff_view_state *s,
2293     struct commit_queue_entry *entry)
2294 {
2295 	const struct got_error *err;
2296 	const struct got_object_id_queue *parent_ids;
2297 	struct got_commit_object *selected_commit;
2298 	struct got_object_qid *pid;
2299 
2300 	free(s->id2);
2301 	s->id2 = got_object_id_dup(entry->id);
2302 	if (s->id2 == NULL)
2303 		return got_error_prefix_errno("got_object_id_dup");
2304 
2305 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2306 	if (err)
2307 		return err;
2308 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2309 	free(s->id1);
2310 	pid = SIMPLEQ_FIRST(parent_ids);
2311 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2312 	got_object_commit_close(selected_commit);
2313 	return NULL;
2314 }
2315 
2316 static const struct got_error *
2317 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2318     struct tog_view **focus_view, struct tog_view *view, int ch)
2319 {
2320 	const struct got_error *err = NULL;
2321 	struct tog_diff_view_state *s = &view->state.diff;
2322 	struct tog_log_view_state *ls;
2323 	struct commit_queue_entry *entry;
2324 	int i;
2325 
2326 	switch (ch) {
2327 		case 'k':
2328 		case KEY_UP:
2329 			if (s->first_displayed_line > 1)
2330 				s->first_displayed_line--;
2331 			else
2332 				view_flash(view);
2333 			break;
2334 		case KEY_PPAGE:
2335 			if (s->first_displayed_line == 1) {
2336 				view_flash(view);
2337 				break;
2338 			}
2339 			i = 0;
2340 			while (i++ < view->nlines - 1 &&
2341 			    s->first_displayed_line > 1)
2342 				s->first_displayed_line--;
2343 			break;
2344 		case 'j':
2345 		case KEY_DOWN:
2346 			if (!s->eof)
2347 				s->first_displayed_line++;
2348 			else
2349 				view_flash(view);
2350 			break;
2351 		case KEY_NPAGE:
2352 		case ' ':
2353 			if (s->eof) {
2354 				view_flash(view);
2355 				break;
2356 			}
2357 			i = 0;
2358 			while (!s->eof && i++ < view->nlines - 1) {
2359 				char *line;
2360 				line = parse_next_line(s->f, NULL);
2361 				s->first_displayed_line++;
2362 				if (line == NULL)
2363 					break;
2364 			}
2365 			break;
2366 		case '[':
2367 			if (s->diff_context > 0) {
2368 				s->diff_context--;
2369 				diff_view_indicate_progress(view);
2370 				err = create_diff(s);
2371 			}
2372 			break;
2373 		case ']':
2374 			if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2375 				s->diff_context++;
2376 				diff_view_indicate_progress(view);
2377 				err = create_diff(s);
2378 			}
2379 			break;
2380 		case '<':
2381 		case ',':
2382 			if (s->log_view == NULL)
2383 				break;
2384 			ls = &s->log_view->state.log;
2385 			entry = TAILQ_PREV(ls->selected_entry,
2386 			    commit_queue_head, entry);
2387 			if (entry == NULL)
2388 				break;
2389 
2390 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2391 			    KEY_UP);
2392 			if (err)
2393 				break;
2394 
2395 			err = set_selected_commit(s, entry);
2396 			if (err)
2397 				break;
2398 
2399 			s->first_displayed_line = 1;
2400 			s->last_displayed_line = view->nlines;
2401 
2402 			diff_view_indicate_progress(view);
2403 			err = create_diff(s);
2404 			break;
2405 		case '>':
2406 		case '.':
2407 			if (s->log_view == NULL)
2408 				break;
2409 			ls = &s->log_view->state.log;
2410 
2411 			if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2412 				ls->thread_args.commits_needed++;
2413 
2414 				/* Display "loading..." in log view. */
2415 				show_log_view(s->log_view);
2416 				update_panels();
2417 				doupdate();
2418 
2419 				err = trigger_log_thread(1 /* load_all */,
2420 				    &ls->thread_args.commits_needed,
2421 				    &ls->thread_args.log_complete,
2422 				    &ls->thread_args.need_commits);
2423 				if (err)
2424 					break;
2425 			}
2426 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2427 			    KEY_DOWN);
2428 			if (err)
2429 				break;
2430 
2431 			entry = TAILQ_NEXT(ls->selected_entry, entry);
2432 			if (entry == NULL)
2433 				break;
2434 
2435 			err = set_selected_commit(s, entry);
2436 			if (err)
2437 				break;
2438 
2439 			s->first_displayed_line = 1;
2440 			s->last_displayed_line = view->nlines;
2441 
2442 			diff_view_indicate_progress(view);
2443 			err = create_diff(s);
2444 			break;
2445 		default:
2446 			break;
2447 	}
2448 
2449 	return err;
2450 }
2451 
2452 static const struct got_error *
2453 cmd_diff(int argc, char *argv[])
2454 {
2455 	const struct got_error *error = NULL;
2456 	struct got_repository *repo = NULL;
2457 	struct got_reflist_head refs;
2458 	struct got_object_id *id1 = NULL, *id2 = NULL;
2459 	char *repo_path = NULL;
2460 	char *id_str1 = NULL, *id_str2 = NULL;
2461 	int ch;
2462 	struct tog_view *view;
2463 
2464 	SIMPLEQ_INIT(&refs);
2465 
2466 #ifndef PROFILE
2467 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2468 	    NULL) == -1)
2469 		err(1, "pledge");
2470 #endif
2471 
2472 	while ((ch = getopt(argc, argv, "")) != -1) {
2473 		switch (ch) {
2474 		default:
2475 			usage_diff();
2476 			/* NOTREACHED */
2477 		}
2478 	}
2479 
2480 	argc -= optind;
2481 	argv += optind;
2482 
2483 	if (argc == 0) {
2484 		usage_diff(); /* TODO show local worktree changes */
2485 	} else if (argc == 2) {
2486 		repo_path = getcwd(NULL, 0);
2487 		if (repo_path == NULL)
2488 			return got_error_prefix_errno("getcwd");
2489 		id_str1 = argv[0];
2490 		id_str2 = argv[1];
2491 	} else if (argc == 3) {
2492 		repo_path = realpath(argv[0], NULL);
2493 		if (repo_path == NULL)
2494 			return got_error_prefix_errno2("realpath", argv[0]);
2495 		id_str1 = argv[1];
2496 		id_str2 = argv[2];
2497 	} else
2498 		usage_diff();
2499 
2500 	init_curses();
2501 
2502 	error = got_repo_open(&repo, repo_path);
2503 	if (error)
2504 		goto done;
2505 
2506 	error = apply_unveil(got_repo_get_path(repo), NULL);
2507 	if (error)
2508 		goto done;
2509 
2510 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2511 	if (error)
2512 		goto done;
2513 
2514 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2515 	if (error)
2516 		goto done;
2517 
2518 	error = got_ref_list(&refs, repo);
2519 	if (error)
2520 		goto done;
2521 
2522 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2523 	if (view == NULL) {
2524 		error = got_error_prefix_errno("view_open");
2525 		goto done;
2526 	}
2527 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2528 	if (error)
2529 		goto done;
2530 	error = view_loop(view);
2531 done:
2532 	free(repo_path);
2533 	got_repo_close(repo);
2534 	got_ref_list_free(&refs);
2535 	return error;
2536 }
2537 
2538 __dead static void
2539 usage_blame(void)
2540 {
2541 	endwin();
2542 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2543 	    getprogname());
2544 	exit(1);
2545 }
2546 
2547 struct tog_blame_line {
2548 	int annotated;
2549 	struct got_object_id *id;
2550 };
2551 
2552 static const struct got_error *
2553 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2554     const char *path, struct tog_blame_line *lines, int nlines,
2555     int blame_complete, int selected_line, int *first_displayed_line,
2556     int *last_displayed_line, int *eof, int max_lines)
2557 {
2558 	const struct got_error *err;
2559 	int lineno = 0, nprinted = 0;
2560 	char *line;
2561 	size_t len;
2562 	wchar_t *wline;
2563 	int width, wlimit;
2564 	struct tog_blame_line *blame_line;
2565 	struct got_object_id *prev_id = NULL;
2566 	char *id_str;
2567 
2568 	err = got_object_id_str(&id_str, id);
2569 	if (err)
2570 		return err;
2571 
2572 	rewind(f);
2573 	werase(view->window);
2574 
2575 	if (asprintf(&line, "commit %s", id_str) == -1) {
2576 		err = got_error_prefix_errno("asprintf");
2577 		free(id_str);
2578 		return err;
2579 	}
2580 
2581 	err = format_line(&wline, &width, line, view->ncols);
2582 	free(line);
2583 	line = NULL;
2584 	if (view_needs_focus_indication(view))
2585 		wstandout(view->window);
2586 	waddwstr(view->window, wline);
2587 	if (view_needs_focus_indication(view))
2588 		wstandend(view->window);
2589 	free(wline);
2590 	wline = NULL;
2591 	if (width < view->ncols)
2592 		waddch(view->window, '\n');
2593 
2594 	if (asprintf(&line, "[%d/%d] %s%s",
2595 	    *first_displayed_line - 1 + selected_line, nlines,
2596 	    blame_complete ? "" : "annotating... ", path) == -1) {
2597 		free(id_str);
2598 		return got_error_prefix_errno("asprintf");
2599 	}
2600 	free(id_str);
2601 	err = format_line(&wline, &width, line, view->ncols);
2602 	free(line);
2603 	line = NULL;
2604 	if (err)
2605 		return err;
2606 	waddwstr(view->window, wline);
2607 	free(wline);
2608 	wline = NULL;
2609 	if (width < view->ncols)
2610 		waddch(view->window, '\n');
2611 
2612 	*eof = 0;
2613 	while (nprinted < max_lines - 2) {
2614 		line = parse_next_line(f, &len);
2615 		if (line == NULL) {
2616 			*eof = 1;
2617 			break;
2618 		}
2619 		if (++lineno < *first_displayed_line) {
2620 			free(line);
2621 			continue;
2622 		}
2623 
2624 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2625 		err = format_line(&wline, &width, line, wlimit);
2626 		if (err) {
2627 			free(line);
2628 			return err;
2629 		}
2630 
2631 		if (view->focussed && nprinted == selected_line - 1)
2632 			wstandout(view->window);
2633 
2634 		blame_line = &lines[lineno - 1];
2635 		if (blame_line->annotated && prev_id &&
2636 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2637 			waddstr(view->window, "         ");
2638 		else if (blame_line->annotated) {
2639 			char *id_str;
2640 			err = got_object_id_str(&id_str, blame_line->id);
2641 			if (err) {
2642 				free(line);
2643 				free(wline);
2644 				return err;
2645 			}
2646 			wprintw(view->window, "%.8s ", id_str);
2647 			free(id_str);
2648 			prev_id = blame_line->id;
2649 		} else {
2650 			waddstr(view->window, "........ ");
2651 			prev_id = NULL;
2652 		}
2653 
2654 		waddwstr(view->window, wline);
2655 		while (width < wlimit) {
2656 			waddch(view->window, ' ');
2657 			width++;
2658 		}
2659 		if (view->focussed && nprinted == selected_line - 1)
2660 			wstandend(view->window);
2661 		if (++nprinted == 1)
2662 			*first_displayed_line = lineno;
2663 		free(line);
2664 		free(wline);
2665 		wline = NULL;
2666 	}
2667 	*last_displayed_line = lineno;
2668 
2669 	view_vborder(view);
2670 
2671 	return NULL;
2672 }
2673 
2674 static const struct got_error *
2675 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2676 {
2677 	const struct got_error *err = NULL;
2678 	struct tog_blame_cb_args *a = arg;
2679 	struct tog_blame_line *line;
2680 	int errcode;
2681 
2682 	if (nlines != a->nlines ||
2683 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2684 		return got_error(GOT_ERR_RANGE);
2685 
2686 	errcode = pthread_mutex_lock(&tog_mutex);
2687 	if (errcode)
2688 		return got_error_set_errno(errcode);
2689 
2690 	if (*a->quit) {	/* user has quit the blame view */
2691 		err = got_error(GOT_ERR_ITER_COMPLETED);
2692 		goto done;
2693 	}
2694 
2695 	if (lineno == -1)
2696 		goto done; /* no change in this commit */
2697 
2698 	line = &a->lines[lineno - 1];
2699 	if (line->annotated)
2700 		goto done;
2701 
2702 	line->id = got_object_id_dup(id);
2703 	if (line->id == NULL) {
2704 		err = got_error_prefix_errno("got_object_id_dup");
2705 		goto done;
2706 	}
2707 	line->annotated = 1;
2708 done:
2709 	errcode = pthread_mutex_unlock(&tog_mutex);
2710 	if (errcode)
2711 		err = got_error_set_errno(errcode);
2712 	return err;
2713 }
2714 
2715 static void *
2716 blame_thread(void *arg)
2717 {
2718 	const struct got_error *err;
2719 	struct tog_blame_thread_args *ta = arg;
2720 	struct tog_blame_cb_args *a = ta->cb_args;
2721 	int errcode;
2722 
2723 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2724 	    blame_cb, ta->cb_args);
2725 
2726 	errcode = pthread_mutex_lock(&tog_mutex);
2727 	if (errcode)
2728 		return (void *)got_error_set_errno(errcode);
2729 
2730 	got_repo_close(ta->repo);
2731 	ta->repo = NULL;
2732 	*ta->complete = 1;
2733 
2734 	errcode = pthread_mutex_unlock(&tog_mutex);
2735 	if (errcode && err == NULL)
2736 		err = got_error_set_errno(errcode);
2737 
2738 	return (void *)err;
2739 }
2740 
2741 static struct got_object_id *
2742 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2743     int selected_line)
2744 {
2745 	struct tog_blame_line *line;
2746 
2747 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2748 	if (!line->annotated)
2749 		return NULL;
2750 
2751 	return line->id;
2752 }
2753 
2754 static const struct got_error *
2755 stop_blame(struct tog_blame *blame)
2756 {
2757 	const struct got_error *err = NULL;
2758 	int i;
2759 
2760 	if (blame->thread) {
2761 		int errcode;
2762 		errcode = pthread_mutex_unlock(&tog_mutex);
2763 		if (errcode)
2764 			return got_error_set_errno(errcode);
2765 		errcode = pthread_join(blame->thread, (void **)&err);
2766 		if (errcode)
2767 			return got_error_set_errno(errcode);
2768 		errcode = pthread_mutex_lock(&tog_mutex);
2769 		if (errcode)
2770 			return got_error_set_errno(errcode);
2771 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2772 			err = NULL;
2773 		blame->thread = NULL;
2774 	}
2775 	if (blame->thread_args.repo) {
2776 		got_repo_close(blame->thread_args.repo);
2777 		blame->thread_args.repo = NULL;
2778 	}
2779 	if (blame->f) {
2780 		if (fclose(blame->f) != 0 && err == NULL)
2781 			err = got_error_prefix_errno("fclose");
2782 		blame->f = NULL;
2783 	}
2784 	if (blame->lines) {
2785 		for (i = 0; i < blame->nlines; i++)
2786 			free(blame->lines[i].id);
2787 		free(blame->lines);
2788 		blame->lines = NULL;
2789 	}
2790 	free(blame->cb_args.commit_id);
2791 	blame->cb_args.commit_id = NULL;
2792 
2793 	return err;
2794 }
2795 
2796 static const struct got_error *
2797 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2798     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2799     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2800     struct got_repository *repo)
2801 {
2802 	const struct got_error *err = NULL;
2803 	struct got_blob_object *blob = NULL;
2804 	struct got_repository *thread_repo = NULL;
2805 	struct got_object_id *obj_id = NULL;
2806 	int obj_type;
2807 
2808 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2809 	if (err)
2810 		return err;
2811 	if (obj_id == NULL)
2812 		return got_error(GOT_ERR_NO_OBJ);
2813 
2814 	err = got_object_get_type(&obj_type, repo, obj_id);
2815 	if (err)
2816 		goto done;
2817 
2818 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2819 		err = got_error(GOT_ERR_OBJ_TYPE);
2820 		goto done;
2821 	}
2822 
2823 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2824 	if (err)
2825 		goto done;
2826 	blame->f = got_opentemp();
2827 	if (blame->f == NULL) {
2828 		err = got_error_prefix_errno("got_opentemp");
2829 		goto done;
2830 	}
2831 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2832 	    blame->f, blob);
2833 	if (err)
2834 		goto done;
2835 
2836 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2837 	if (blame->lines == NULL) {
2838 		err = got_error_prefix_errno("calloc");
2839 		goto done;
2840 	}
2841 
2842 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2843 	if (err)
2844 		goto done;
2845 
2846 	blame->cb_args.view = view;
2847 	blame->cb_args.lines = blame->lines;
2848 	blame->cb_args.nlines = blame->nlines;
2849 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2850 	if (blame->cb_args.commit_id == NULL) {
2851 		err = got_error_prefix_errno("got_object_id_dup");
2852 		goto done;
2853 	}
2854 	blame->cb_args.quit = done;
2855 
2856 	blame->thread_args.path = path;
2857 	blame->thread_args.repo = thread_repo;
2858 	blame->thread_args.cb_args = &blame->cb_args;
2859 	blame->thread_args.complete = blame_complete;
2860 	*blame_complete = 0;
2861 
2862 done:
2863 	if (blob)
2864 		got_object_blob_close(blob);
2865 	free(obj_id);
2866 	if (err)
2867 		stop_blame(blame);
2868 	return err;
2869 }
2870 
2871 static const struct got_error *
2872 open_blame_view(struct tog_view *view, char *path,
2873     struct got_object_id *commit_id, struct got_reflist_head *refs,
2874     struct got_repository *repo)
2875 {
2876 	const struct got_error *err = NULL;
2877 	struct tog_blame_view_state *s = &view->state.blame;
2878 
2879 	SIMPLEQ_INIT(&s->blamed_commits);
2880 
2881 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2882 	if (err)
2883 		return err;
2884 
2885 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2886 	s->first_displayed_line = 1;
2887 	s->last_displayed_line = view->nlines;
2888 	s->selected_line = 1;
2889 	s->blame_complete = 0;
2890 	s->path = path;
2891 	if (s->path == NULL)
2892 		return got_error_prefix_errno("open_blame_view");
2893 	s->repo = repo;
2894 	s->refs = refs;
2895 	s->commit_id = commit_id;
2896 	memset(&s->blame, 0, sizeof(s->blame));
2897 
2898 	view->show = show_blame_view;
2899 	view->input = input_blame_view;
2900 	view->close = close_blame_view;
2901 
2902 	return run_blame(&s->blame, view, &s->blame_complete,
2903 	    &s->first_displayed_line, &s->last_displayed_line,
2904 	    &s->selected_line, &s->done, &s->eof, s->path,
2905 	    s->blamed_commit->id, s->repo);
2906 }
2907 
2908 static const struct got_error *
2909 close_blame_view(struct tog_view *view)
2910 {
2911 	const struct got_error *err = NULL;
2912 	struct tog_blame_view_state *s = &view->state.blame;
2913 
2914 	if (s->blame.thread)
2915 		err = stop_blame(&s->blame);
2916 
2917 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2918 		struct got_object_qid *blamed_commit;
2919 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2920 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2921 		got_object_qid_free(blamed_commit);
2922 	}
2923 
2924 	free(s->path);
2925 
2926 	return err;
2927 }
2928 
2929 static const struct got_error *
2930 show_blame_view(struct tog_view *view)
2931 {
2932 	const struct got_error *err = NULL;
2933 	struct tog_blame_view_state *s = &view->state.blame;
2934 	int errcode;
2935 
2936 	if (s->blame.thread == NULL) {
2937 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2938 		    &s->blame.thread_args);
2939 		if (errcode)
2940 			return got_error_set_errno(errcode);
2941 	}
2942 
2943 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2944 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2945 	    s->selected_line, &s->first_displayed_line,
2946 	    &s->last_displayed_line, &s->eof, view->nlines);
2947 
2948 	view_vborder(view);
2949 	return err;
2950 }
2951 
2952 static const struct got_error *
2953 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2954     struct tog_view **focus_view, struct tog_view *view, int ch)
2955 {
2956 	const struct got_error *err = NULL, *thread_err = NULL;
2957 	struct tog_view *diff_view;
2958 	struct tog_blame_view_state *s = &view->state.blame;
2959 	int begin_x = 0;
2960 
2961 	switch (ch) {
2962 		case 'q':
2963 			s->done = 1;
2964 			break;
2965 		case 'k':
2966 		case KEY_UP:
2967 			if (s->selected_line > 1)
2968 				s->selected_line--;
2969 			else if (s->selected_line == 1 &&
2970 			    s->first_displayed_line > 1)
2971 				s->first_displayed_line--;
2972 			else
2973 				view_flash(view);
2974 			break;
2975 		case KEY_PPAGE:
2976 			if (s->first_displayed_line == 1) {
2977 				if (s->selected_line == 1) {
2978 					view_flash(view);
2979 					break;
2980 				}
2981 				s->selected_line = 1;
2982 				break;
2983 			}
2984 			if (s->first_displayed_line > view->nlines - 2)
2985 				s->first_displayed_line -=
2986 				    (view->nlines - 2);
2987 			else
2988 				s->first_displayed_line = 1;
2989 			break;
2990 		case 'j':
2991 		case KEY_DOWN:
2992 			if (s->selected_line < view->nlines - 2 &&
2993 			    s->first_displayed_line +
2994 			    s->selected_line <= s->blame.nlines)
2995 				s->selected_line++;
2996 			else if (s->last_displayed_line <
2997 			    s->blame.nlines)
2998 				s->first_displayed_line++;
2999 			else
3000 				view_flash(view);
3001 			break;
3002 		case 'b':
3003 		case 'p': {
3004 			struct got_object_id *id = NULL;
3005 			id = get_selected_commit_id(s->blame.lines,
3006 			    s->first_displayed_line, s->selected_line);
3007 			if (id == NULL)
3008 				break;
3009 			if (ch == 'p') {
3010 				struct got_commit_object *commit;
3011 				struct got_object_qid *pid;
3012 				struct got_object_id *blob_id = NULL;
3013 				int obj_type;
3014 				err = got_object_open_as_commit(&commit,
3015 				    s->repo, id);
3016 				if (err)
3017 					break;
3018 				pid = SIMPLEQ_FIRST(
3019 				    got_object_commit_get_parent_ids(commit));
3020 				if (pid == NULL) {
3021 					got_object_commit_close(commit);
3022 					break;
3023 				}
3024 				/* Check if path history ends here. */
3025 				err = got_object_id_by_path(&blob_id, s->repo,
3026 				    pid->id, s->path);
3027 				if (err) {
3028 					if (err->code == GOT_ERR_NO_TREE_ENTRY)
3029 						err = NULL;
3030 					got_object_commit_close(commit);
3031 					break;
3032 				}
3033 				err = got_object_get_type(&obj_type, s->repo,
3034 				    blob_id);
3035 				free(blob_id);
3036 				/* Can't blame non-blob type objects. */
3037 				if (obj_type != GOT_OBJ_TYPE_BLOB) {
3038 					got_object_commit_close(commit);
3039 					break;
3040 				}
3041 				err = got_object_qid_alloc(&s->blamed_commit,
3042 				    pid->id);
3043 				got_object_commit_close(commit);
3044 			} else {
3045 				if (got_object_id_cmp(id,
3046 				    s->blamed_commit->id) == 0)
3047 					break;
3048 				err = got_object_qid_alloc(&s->blamed_commit,
3049 				    id);
3050 			}
3051 			if (err)
3052 				break;
3053 			s->done = 1;
3054 			thread_err = stop_blame(&s->blame);
3055 			s->done = 0;
3056 			if (thread_err)
3057 				break;
3058 			SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3059 			    s->blamed_commit, entry);
3060 			err = run_blame(&s->blame, view, &s->blame_complete,
3061 			    &s->first_displayed_line, &s->last_displayed_line,
3062 			    &s->selected_line, &s->done, &s->eof,
3063 			    s->path, s->blamed_commit->id, s->repo);
3064 			if (err)
3065 				break;
3066 			break;
3067 		}
3068 		case 'B': {
3069 			struct got_object_qid *first;
3070 			first = SIMPLEQ_FIRST(&s->blamed_commits);
3071 			if (!got_object_id_cmp(first->id, s->commit_id))
3072 				break;
3073 			s->done = 1;
3074 			thread_err = stop_blame(&s->blame);
3075 			s->done = 0;
3076 			if (thread_err)
3077 				break;
3078 			SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3079 			got_object_qid_free(s->blamed_commit);
3080 			s->blamed_commit =
3081 			    SIMPLEQ_FIRST(&s->blamed_commits);
3082 			err = run_blame(&s->blame, view, &s->blame_complete,
3083 			    &s->first_displayed_line, &s->last_displayed_line,
3084 			    &s->selected_line, &s->done, &s->eof, s->path,
3085 			    s->blamed_commit->id, s->repo);
3086 			if (err)
3087 				break;
3088 			break;
3089 		}
3090 		case KEY_ENTER:
3091 		case '\r': {
3092 			struct got_object_id *id = NULL;
3093 			struct got_object_qid *pid;
3094 			struct got_commit_object *commit = NULL;
3095 			id = get_selected_commit_id(s->blame.lines,
3096 			    s->first_displayed_line, s->selected_line);
3097 			if (id == NULL)
3098 				break;
3099 			err = got_object_open_as_commit(&commit, s->repo, id);
3100 			if (err)
3101 				break;
3102 			pid = SIMPLEQ_FIRST(
3103 			    got_object_commit_get_parent_ids(commit));
3104 			if (view_is_parent_view(view))
3105 			    begin_x = view_split_begin_x(view->begin_x);
3106 			diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3107 			if (diff_view == NULL) {
3108 				got_object_commit_close(commit);
3109 				err = got_error_prefix_errno("view_open");
3110 				break;
3111 			}
3112 			err = open_diff_view(diff_view, pid ? pid->id : NULL,
3113 			    id, NULL, s->refs, s->repo);
3114 			got_object_commit_close(commit);
3115 			if (err) {
3116 				view_close(diff_view);
3117 				break;
3118 			}
3119 			if (view_is_parent_view(view)) {
3120 				err = view_close_child(view);
3121 				if (err)
3122 					break;
3123 				err = view_set_child(view, diff_view);
3124 				if (err) {
3125 					view_close(diff_view);
3126 					break;
3127 				}
3128 				*focus_view = diff_view;
3129 				view->child_focussed = 1;
3130 			} else
3131 				*new_view = diff_view;
3132 			if (err)
3133 				break;
3134 			break;
3135 		}
3136 		case KEY_NPAGE:
3137 		case ' ':
3138 			if (s->last_displayed_line >= s->blame.nlines &&
3139 			    s->selected_line >= MIN(s->blame.nlines,
3140 			        view->nlines - 2)) {
3141 				view_flash(view);
3142 				break;
3143 			}
3144 			if (s->last_displayed_line >= s->blame.nlines &&
3145 			    s->selected_line < view->nlines - 2) {
3146 				s->selected_line = MIN(s->blame.nlines,
3147 				    view->nlines - 2);
3148 				break;
3149 			}
3150 			if (s->last_displayed_line + view->nlines - 2
3151 			    <= s->blame.nlines)
3152 				s->first_displayed_line +=
3153 				    view->nlines - 2;
3154 			else
3155 				s->first_displayed_line =
3156 				    s->blame.nlines -
3157 				    (view->nlines - 3);
3158 			break;
3159 		case KEY_RESIZE:
3160 			if (s->selected_line > view->nlines - 2) {
3161 				s->selected_line = MIN(s->blame.nlines,
3162 				    view->nlines - 2);
3163 			}
3164 			break;
3165 		default:
3166 			break;
3167 	}
3168 	return thread_err ? thread_err : err;
3169 }
3170 
3171 static const struct got_error *
3172 cmd_blame(int argc, char *argv[])
3173 {
3174 	const struct got_error *error;
3175 	struct got_repository *repo = NULL;
3176 	struct got_reflist_head refs;
3177 	struct got_worktree *worktree = NULL;
3178 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3179 	struct got_object_id *commit_id = NULL;
3180 	char *commit_id_str = NULL;
3181 	int ch;
3182 	struct tog_view *view;
3183 
3184 	SIMPLEQ_INIT(&refs);
3185 
3186 #ifndef PROFILE
3187 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3188 	    NULL) == -1)
3189 		err(1, "pledge");
3190 #endif
3191 
3192 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3193 		switch (ch) {
3194 		case 'c':
3195 			commit_id_str = optarg;
3196 			break;
3197 		case 'r':
3198 			repo_path = realpath(optarg, NULL);
3199 			if (repo_path == NULL)
3200 				err(1, "-r option");
3201 			break;
3202 		default:
3203 			usage_blame();
3204 			/* NOTREACHED */
3205 		}
3206 	}
3207 
3208 	argc -= optind;
3209 	argv += optind;
3210 
3211 	if (argc == 1)
3212 		path = argv[0];
3213 	else
3214 		usage_blame();
3215 
3216 	cwd = getcwd(NULL, 0);
3217 	if (cwd == NULL) {
3218 		error = got_error_prefix_errno("getcwd");
3219 		goto done;
3220 	}
3221 	if (repo_path == NULL) {
3222 		error = got_worktree_open(&worktree, cwd);
3223 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3224 			goto done;
3225 		else
3226 			error = NULL;
3227 		if (worktree) {
3228 			repo_path =
3229 			    strdup(got_worktree_get_repo_path(worktree));
3230 			if (repo_path == NULL)
3231 				error = got_error_prefix_errno("strdup");
3232 			if (error)
3233 				goto done;
3234 		} else {
3235 			repo_path = strdup(cwd);
3236 			if (repo_path == NULL) {
3237 				error = got_error_prefix_errno("strdup");
3238 				goto done;
3239 			}
3240 		}
3241 	}
3242 
3243 	init_curses();
3244 
3245 	error = got_repo_open(&repo, repo_path);
3246 	if (error != NULL)
3247 		goto done;
3248 
3249 	error = apply_unveil(got_repo_get_path(repo), NULL);
3250 	if (error)
3251 		goto done;
3252 
3253 	if (worktree) {
3254 		const char *prefix = got_worktree_get_path_prefix(worktree);
3255 		char *p, *worktree_subdir = cwd +
3256 		    strlen(got_worktree_get_root_path(worktree));
3257 		if (asprintf(&p, "%s%s%s%s%s",
3258 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3259 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3260 		    path) == -1) {
3261 			error = got_error_prefix_errno("asprintf");
3262 			goto done;
3263 		}
3264 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3265 		free(p);
3266 	} else {
3267 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3268 	}
3269 	if (error)
3270 		goto done;
3271 
3272 	if (commit_id_str == NULL) {
3273 		struct got_reference *head_ref;
3274 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
3275 		if (error != NULL)
3276 			goto done;
3277 		error = got_ref_resolve(&commit_id, repo, head_ref);
3278 		got_ref_close(head_ref);
3279 	} else {
3280 		error = got_object_resolve_id_str(&commit_id, repo,
3281 		    commit_id_str);
3282 	}
3283 	if (error != NULL)
3284 		goto done;
3285 
3286 	error = got_ref_list(&refs, repo);
3287 	if (error)
3288 		goto done;
3289 
3290 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3291 	if (view == NULL) {
3292 		error = got_error_prefix_errno("view_open");
3293 		goto done;
3294 	}
3295 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3296 	if (error)
3297 		goto done;
3298 	error = view_loop(view);
3299 done:
3300 	free(repo_path);
3301 	free(cwd);
3302 	free(commit_id);
3303 	if (worktree)
3304 		got_worktree_close(worktree);
3305 	if (repo)
3306 		got_repo_close(repo);
3307 	got_ref_list_free(&refs);
3308 	return error;
3309 }
3310 
3311 static const struct got_error *
3312 draw_tree_entries(struct tog_view *view,
3313     struct got_tree_entry **first_displayed_entry,
3314     struct got_tree_entry **last_displayed_entry,
3315     struct got_tree_entry **selected_entry, int *ndisplayed,
3316     const char *label, int show_ids, const char *parent_path,
3317     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3318 {
3319 	const struct got_error *err = NULL;
3320 	struct got_tree_entry *te;
3321 	wchar_t *wline;
3322 	int width, n;
3323 
3324 	*ndisplayed = 0;
3325 
3326 	werase(view->window);
3327 
3328 	if (limit == 0)
3329 		return NULL;
3330 
3331 	err = format_line(&wline, &width, label, view->ncols);
3332 	if (err)
3333 		return err;
3334 	if (view_needs_focus_indication(view))
3335 		wstandout(view->window);
3336 	waddwstr(view->window, wline);
3337 	if (view_needs_focus_indication(view))
3338 		wstandend(view->window);
3339 	free(wline);
3340 	wline = NULL;
3341 	if (width < view->ncols)
3342 		waddch(view->window, '\n');
3343 	if (--limit <= 0)
3344 		return NULL;
3345 	err = format_line(&wline, &width, parent_path, view->ncols);
3346 	if (err)
3347 		return err;
3348 	waddwstr(view->window, wline);
3349 	free(wline);
3350 	wline = NULL;
3351 	if (width < view->ncols)
3352 		waddch(view->window, '\n');
3353 	if (--limit <= 0)
3354 		return NULL;
3355 	waddch(view->window, '\n');
3356 	if (--limit <= 0)
3357 		return NULL;
3358 
3359 	te = SIMPLEQ_FIRST(&entries->head);
3360 	if (*first_displayed_entry == NULL) {
3361 		if (selected == 0) {
3362 			if (view->focussed)
3363 				wstandout(view->window);
3364 			*selected_entry = NULL;
3365 		}
3366 		waddstr(view->window, "  ..\n");	/* parent directory */
3367 		if (selected == 0 && view->focussed)
3368 			wstandend(view->window);
3369 		(*ndisplayed)++;
3370 		if (--limit <= 0)
3371 			return NULL;
3372 		n = 1;
3373 	} else {
3374 		n = 0;
3375 		while (te != *first_displayed_entry)
3376 			te = SIMPLEQ_NEXT(te, entry);
3377 	}
3378 
3379 	while (te) {
3380 		char *line = NULL, *id_str = NULL;
3381 
3382 		if (show_ids) {
3383 			err = got_object_id_str(&id_str, te->id);
3384 			if (err)
3385 				return got_error_prefix_errno(
3386 				    "got_object_id_str");
3387 		}
3388 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3389 		    te->name, S_ISDIR(te->mode) ? "/" :
3390 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3391 			free(id_str);
3392 			return got_error_prefix_errno("asprintf");
3393 		}
3394 		free(id_str);
3395 		err = format_line(&wline, &width, line, view->ncols);
3396 		if (err) {
3397 			free(line);
3398 			break;
3399 		}
3400 		if (n == selected) {
3401 			if (view->focussed)
3402 				wstandout(view->window);
3403 			*selected_entry = te;
3404 		}
3405 		waddwstr(view->window, wline);
3406 		if (width < view->ncols)
3407 			waddch(view->window, '\n');
3408 		if (n == selected && view->focussed)
3409 			wstandend(view->window);
3410 		free(line);
3411 		free(wline);
3412 		wline = NULL;
3413 		n++;
3414 		(*ndisplayed)++;
3415 		*last_displayed_entry = te;
3416 		if (--limit <= 0)
3417 			break;
3418 		te = SIMPLEQ_NEXT(te, entry);
3419 	}
3420 
3421 	return err;
3422 }
3423 
3424 static void
3425 tree_scroll_up(struct tog_view *view,
3426     struct got_tree_entry **first_displayed_entry, int maxscroll,
3427     const struct got_tree_entries *entries, int isroot)
3428 {
3429 	struct got_tree_entry *te, *prev;
3430 	int i;
3431 
3432 	if (*first_displayed_entry == NULL) {
3433 		view_flash(view);
3434 		return;
3435 	}
3436 
3437 	te = SIMPLEQ_FIRST(&entries->head);
3438 	if (*first_displayed_entry == te) {
3439 		view_flash(view);
3440 		if (!isroot)
3441 			*first_displayed_entry = NULL;
3442 		return;
3443 	}
3444 
3445 	/* XXX this is stupid... switch to TAILQ? */
3446 	for (i = 0; i < maxscroll; i++) {
3447 		while (te != *first_displayed_entry) {
3448 			prev = te;
3449 			te = SIMPLEQ_NEXT(te, entry);
3450 		}
3451 		*first_displayed_entry = prev;
3452 		te = SIMPLEQ_FIRST(&entries->head);
3453 	}
3454 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3455 		*first_displayed_entry = NULL;
3456 }
3457 
3458 static int
3459 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3460 	struct got_tree_entry *last_displayed_entry,
3461 	const struct got_tree_entries *entries)
3462 {
3463 	struct got_tree_entry *next, *last;
3464 	int n = 0;
3465 
3466 	if (*first_displayed_entry)
3467 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3468 	else
3469 		next = SIMPLEQ_FIRST(&entries->head);
3470 	last = last_displayed_entry;
3471 	while (next && last && n++ < maxscroll) {
3472 		last = SIMPLEQ_NEXT(last, entry);
3473 		if (last) {
3474 			*first_displayed_entry = next;
3475 			next = SIMPLEQ_NEXT(next, entry);
3476 		}
3477 	}
3478 	return n;
3479 }
3480 
3481 static const struct got_error *
3482 tree_entry_path(char **path, struct tog_parent_trees *parents,
3483     struct got_tree_entry *te)
3484 {
3485 	const struct got_error *err = NULL;
3486 	struct tog_parent_tree *pt;
3487 	size_t len = 2; /* for leading slash and NUL */
3488 
3489 	TAILQ_FOREACH(pt, parents, entry)
3490 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3491 	if (te)
3492 		len += strlen(te->name);
3493 
3494 	*path = calloc(1, len);
3495 	if (path == NULL)
3496 		return got_error_prefix_errno("calloc");
3497 
3498 	(*path)[0] = '/';
3499 	pt = TAILQ_LAST(parents, tog_parent_trees);
3500 	while (pt) {
3501 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3502 			err = got_error(GOT_ERR_NO_SPACE);
3503 			goto done;
3504 		}
3505 		if (strlcat(*path, "/", len) >= len) {
3506 			err = got_error(GOT_ERR_NO_SPACE);
3507 			goto done;
3508 		}
3509 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3510 	}
3511 	if (te) {
3512 		if (strlcat(*path, te->name, len) >= len) {
3513 			err = got_error(GOT_ERR_NO_SPACE);
3514 			goto done;
3515 		}
3516 	}
3517 done:
3518 	if (err) {
3519 		free(*path);
3520 		*path = NULL;
3521 	}
3522 	return err;
3523 }
3524 
3525 static const struct got_error *
3526 blame_tree_entry(struct tog_view **new_view, int begin_x,
3527     struct got_tree_entry *te, struct tog_parent_trees *parents,
3528     struct got_object_id *commit_id, struct got_reflist_head *refs,
3529     struct got_repository *repo)
3530 {
3531 	const struct got_error *err = NULL;
3532 	char *path;
3533 	struct tog_view *blame_view;
3534 
3535 	err = tree_entry_path(&path, parents, te);
3536 	if (err)
3537 		return err;
3538 
3539 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3540 	if (blame_view == NULL)
3541 		return got_error_prefix_errno("view_open");
3542 
3543 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3544 	if (err) {
3545 		view_close(blame_view);
3546 		free(path);
3547 	} else
3548 		*new_view = blame_view;
3549 	return err;
3550 }
3551 
3552 static const struct got_error *
3553 log_tree_entry(struct tog_view **new_view, int begin_x,
3554     struct got_tree_entry *te, struct tog_parent_trees *parents,
3555     struct got_object_id *commit_id, struct got_reflist_head *refs,
3556     struct got_repository *repo)
3557 {
3558 	struct tog_view *log_view;
3559 	const struct got_error *err = NULL;
3560 	char *path;
3561 
3562 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3563 	if (log_view == NULL)
3564 		return got_error_prefix_errno("view_open");
3565 
3566 	err = tree_entry_path(&path, parents, te);
3567 	if (err)
3568 		return err;
3569 
3570 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3571 	if (err)
3572 		view_close(log_view);
3573 	else
3574 		*new_view = log_view;
3575 	free(path);
3576 	return err;
3577 }
3578 
3579 static const struct got_error *
3580 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3581     struct got_object_id *commit_id, struct got_reflist_head *refs,
3582     struct got_repository *repo)
3583 {
3584 	const struct got_error *err = NULL;
3585 	char *commit_id_str = NULL;
3586 	struct tog_tree_view_state *s = &view->state.tree;
3587 
3588 	TAILQ_INIT(&s->parents);
3589 
3590 	err = got_object_id_str(&commit_id_str, commit_id);
3591 	if (err != NULL)
3592 		goto done;
3593 
3594 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3595 		err = got_error_prefix_errno("asprintf");
3596 		goto done;
3597 	}
3598 
3599 	s->root = s->tree = root;
3600 	s->entries = got_object_tree_get_entries(root);
3601 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3602 	s->commit_id = got_object_id_dup(commit_id);
3603 	if (s->commit_id == NULL) {
3604 		err = got_error_prefix_errno("got_object_id_dup");
3605 		goto done;
3606 	}
3607 	s->refs = refs;
3608 	s->repo = repo;
3609 
3610 	view->show = show_tree_view;
3611 	view->input = input_tree_view;
3612 	view->close = close_tree_view;
3613 done:
3614 	free(commit_id_str);
3615 	if (err) {
3616 		free(s->tree_label);
3617 		s->tree_label = NULL;
3618 	}
3619 	return err;
3620 }
3621 
3622 static const struct got_error *
3623 close_tree_view(struct tog_view *view)
3624 {
3625 	struct tog_tree_view_state *s = &view->state.tree;
3626 
3627 	free(s->tree_label);
3628 	s->tree_label = NULL;
3629 	free(s->commit_id);
3630 	s->commit_id = NULL;
3631 	while (!TAILQ_EMPTY(&s->parents)) {
3632 		struct tog_parent_tree *parent;
3633 		parent = TAILQ_FIRST(&s->parents);
3634 		TAILQ_REMOVE(&s->parents, parent, entry);
3635 		free(parent);
3636 
3637 	}
3638 	if (s->tree != s->root)
3639 		got_object_tree_close(s->tree);
3640 	got_object_tree_close(s->root);
3641 
3642 	return NULL;
3643 }
3644 
3645 static const struct got_error *
3646 show_tree_view(struct tog_view *view)
3647 {
3648 	const struct got_error *err = NULL;
3649 	struct tog_tree_view_state *s = &view->state.tree;
3650 	char *parent_path;
3651 
3652 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3653 	if (err)
3654 		return err;
3655 
3656 	err = draw_tree_entries(view, &s->first_displayed_entry,
3657 	    &s->last_displayed_entry, &s->selected_entry,
3658 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3659 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3660 	free(parent_path);
3661 
3662 	view_vborder(view);
3663 	return err;
3664 }
3665 
3666 static const struct got_error *
3667 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3668     struct tog_view **focus_view, struct tog_view *view, int ch)
3669 {
3670 	const struct got_error *err = NULL;
3671 	struct tog_tree_view_state *s = &view->state.tree;
3672 	struct tog_view *log_view;
3673 	int begin_x = 0, nscrolled;
3674 
3675 	switch (ch) {
3676 		case 'i':
3677 			s->show_ids = !s->show_ids;
3678 			break;
3679 		case 'l':
3680 			if (!s->selected_entry)
3681 				break;
3682 			if (view_is_parent_view(view))
3683 				begin_x = view_split_begin_x(view->begin_x);
3684 			err = log_tree_entry(&log_view, begin_x,
3685 			    s->selected_entry, &s->parents,
3686 			    s->commit_id, s->refs, s->repo);
3687 			if (view_is_parent_view(view)) {
3688 				err = view_close_child(view);
3689 				if (err)
3690 					return err;
3691 				err = view_set_child(view, log_view);
3692 				if (err) {
3693 					view_close(log_view);
3694 					break;
3695 				}
3696 				*focus_view = log_view;
3697 				view->child_focussed = 1;
3698 			} else
3699 				*new_view = log_view;
3700 			break;
3701 		case 'k':
3702 		case KEY_UP:
3703 			if (s->selected > 0) {
3704 				s->selected--;
3705 				if (s->selected == 0)
3706 					break;
3707 			}
3708 			if (s->selected > 0)
3709 				break;
3710 			tree_scroll_up(view, &s->first_displayed_entry, 1,
3711 			    s->entries, s->tree == s->root);
3712 			break;
3713 		case KEY_PPAGE:
3714 			tree_scroll_up(view, &s->first_displayed_entry,
3715 			    MAX(0, view->nlines - 4 - s->selected), s->entries,
3716 			    s->tree == s->root);
3717 			s->selected = 0;
3718 			if (SIMPLEQ_FIRST(&s->entries->head) ==
3719 			    s->first_displayed_entry && s->tree != s->root)
3720 				s->first_displayed_entry = NULL;
3721 			break;
3722 		case 'j':
3723 		case KEY_DOWN:
3724 			if (s->selected < s->ndisplayed - 1) {
3725 				s->selected++;
3726 				break;
3727 			}
3728 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3729 			    == NULL) {
3730 				/* can't scroll any further */
3731 				view_flash(view);
3732 				break;
3733 			}
3734 			tree_scroll_down(&s->first_displayed_entry, 1,
3735 			    s->last_displayed_entry, s->entries);
3736 			break;
3737 		case KEY_NPAGE:
3738 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3739 			    == NULL) {
3740 				/* can't scroll any further; move cursor down */
3741 				if (s->selected < s->ndisplayed - 1)
3742 					s->selected = s->ndisplayed - 1;
3743 				else
3744 					view_flash(view);
3745 				break;
3746 			}
3747 			nscrolled = tree_scroll_down(&s->first_displayed_entry,
3748 			    view->nlines, s->last_displayed_entry, s->entries);
3749 			if (nscrolled < view->nlines) {
3750 				int ndisplayed = 0;
3751 				struct got_tree_entry *te;
3752 				te = s->first_displayed_entry;
3753 				do {
3754 					ndisplayed++;
3755 					te = SIMPLEQ_NEXT(te, entry);
3756 				} while (te);
3757 				s->selected = ndisplayed - 1;
3758 			}
3759 			break;
3760 		case KEY_ENTER:
3761 		case '\r':
3762 			if (s->selected_entry == NULL) {
3763 				struct tog_parent_tree *parent;
3764 		case KEY_BACKSPACE:
3765 				/* user selected '..' */
3766 				if (s->tree == s->root)
3767 					break;
3768 				parent = TAILQ_FIRST(&s->parents);
3769 				TAILQ_REMOVE(&s->parents, parent,
3770 				    entry);
3771 				got_object_tree_close(s->tree);
3772 				s->tree = parent->tree;
3773 				s->entries =
3774 				    got_object_tree_get_entries(s->tree);
3775 				s->first_displayed_entry =
3776 				    parent->first_displayed_entry;
3777 				s->selected_entry =
3778 				    parent->selected_entry;
3779 				s->selected = parent->selected;
3780 				free(parent);
3781 			} else if (S_ISDIR(s->selected_entry->mode)) {
3782 				struct tog_parent_tree *parent;
3783 				struct got_tree_object *child;
3784 				err = got_object_open_as_tree(&child,
3785 				    s->repo, s->selected_entry->id);
3786 				if (err)
3787 					break;
3788 				parent = calloc(1, sizeof(*parent));
3789 				if (parent == NULL) {
3790 					err = got_error_prefix_errno("calloc");
3791 					break;
3792 				}
3793 				parent->tree = s->tree;
3794 				parent->first_displayed_entry =
3795 				   s->first_displayed_entry;
3796 				parent->selected_entry = s->selected_entry;
3797 				parent->selected = s->selected;
3798 				TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3799 				s->tree = child;
3800 				s->entries =
3801 				    got_object_tree_get_entries(s->tree);
3802 				s->selected = 0;
3803 				s->first_displayed_entry = NULL;
3804 			} else if (S_ISREG(s->selected_entry->mode)) {
3805 				struct tog_view *blame_view;
3806 				int begin_x = view_is_parent_view(view) ?
3807 				    view_split_begin_x(view->begin_x) : 0;
3808 
3809 				err = blame_tree_entry(&blame_view, begin_x,
3810 				    s->selected_entry, &s->parents,
3811 				    s->commit_id, s->refs, s->repo);
3812 				if (err)
3813 					break;
3814 				if (view_is_parent_view(view)) {
3815 					err = view_close_child(view);
3816 					if (err)
3817 						return err;
3818 					err = view_set_child(view, blame_view);
3819 					if (err) {
3820 						view_close(blame_view);
3821 						break;
3822 					}
3823 					*focus_view = blame_view;
3824 					view->child_focussed = 1;
3825 				} else
3826 					*new_view = blame_view;
3827 			}
3828 			break;
3829 		case KEY_RESIZE:
3830 			if (s->selected > view->nlines)
3831 				s->selected = s->ndisplayed - 1;
3832 			break;
3833 		default:
3834 			break;
3835 	}
3836 
3837 	return err;
3838 }
3839 
3840 __dead static void
3841 usage_tree(void)
3842 {
3843 	endwin();
3844 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3845 	    getprogname());
3846 	exit(1);
3847 }
3848 
3849 static const struct got_error *
3850 cmd_tree(int argc, char *argv[])
3851 {
3852 	const struct got_error *error;
3853 	struct got_repository *repo = NULL;
3854 	struct got_reflist_head refs;
3855 	char *repo_path = NULL;
3856 	struct got_object_id *commit_id = NULL;
3857 	char *commit_id_arg = NULL;
3858 	struct got_commit_object *commit = NULL;
3859 	struct got_tree_object *tree = NULL;
3860 	int ch;
3861 	struct tog_view *view;
3862 
3863 	SIMPLEQ_INIT(&refs);
3864 
3865 #ifndef PROFILE
3866 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3867 	    NULL) == -1)
3868 		err(1, "pledge");
3869 #endif
3870 
3871 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3872 		switch (ch) {
3873 		case 'c':
3874 			commit_id_arg = optarg;
3875 			break;
3876 		default:
3877 			usage_tree();
3878 			/* NOTREACHED */
3879 		}
3880 	}
3881 
3882 	argc -= optind;
3883 	argv += optind;
3884 
3885 	if (argc == 0) {
3886 		struct got_worktree *worktree;
3887 		char *cwd = getcwd(NULL, 0);
3888 		if (cwd == NULL)
3889 			return got_error_prefix_errno("getcwd");
3890 		error = got_worktree_open(&worktree, cwd);
3891 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3892 			goto done;
3893 		if (worktree) {
3894 			free(cwd);
3895 			repo_path =
3896 			    strdup(got_worktree_get_repo_path(worktree));
3897 			got_worktree_close(worktree);
3898 		} else
3899 			repo_path = cwd;
3900 		if (repo_path == NULL) {
3901 			error = got_error_prefix_errno("strdup");
3902 			goto done;
3903 		}
3904 	} else if (argc == 1) {
3905 		repo_path = realpath(argv[0], NULL);
3906 		if (repo_path == NULL)
3907 			return got_error_prefix_errno2("realpath", argv[0]);
3908 	} else
3909 		usage_log();
3910 
3911 	init_curses();
3912 
3913 	error = got_repo_open(&repo, repo_path);
3914 	if (error != NULL)
3915 		goto done;
3916 
3917 	error = apply_unveil(got_repo_get_path(repo), NULL);
3918 	if (error)
3919 		goto done;
3920 
3921 	if (commit_id_arg == NULL)
3922 		error = get_head_commit_id(&commit_id, repo);
3923 	else
3924 		error = got_object_resolve_id_str(&commit_id, repo,
3925 		    commit_id_arg);
3926 	if (error != NULL)
3927 		goto done;
3928 
3929 	error = got_object_open_as_commit(&commit, repo, commit_id);
3930 	if (error != NULL)
3931 		goto done;
3932 
3933 	error = got_object_open_as_tree(&tree, repo,
3934 	    got_object_commit_get_tree_id(commit));
3935 	if (error != NULL)
3936 		goto done;
3937 
3938 	error = got_ref_list(&refs, repo);
3939 	if (error)
3940 		goto done;
3941 
3942 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3943 	if (view == NULL) {
3944 		error = got_error_prefix_errno("view_open");
3945 		goto done;
3946 	}
3947 	error = open_tree_view(view, tree, commit_id, &refs, repo);
3948 	if (error)
3949 		goto done;
3950 	error = view_loop(view);
3951 done:
3952 	free(repo_path);
3953 	free(commit_id);
3954 	if (commit)
3955 		got_object_commit_close(commit);
3956 	if (tree)
3957 		got_object_tree_close(tree);
3958 	if (repo)
3959 		got_repo_close(repo);
3960 	got_ref_list_free(&refs);
3961 	return error;
3962 }
3963 
3964 __dead static void
3965 usage(void)
3966 {
3967 	int i;
3968 
3969 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3970 	    "Available commands:\n", getprogname());
3971 	for (i = 0; i < nitems(tog_commands); i++) {
3972 		struct tog_cmd *cmd = &tog_commands[i];
3973 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3974 	}
3975 	exit(1);
3976 }
3977 
3978 static char **
3979 make_argv(const char *arg0, const char *arg1)
3980 {
3981 	char **argv;
3982 	int argc = (arg1 == NULL ? 1 : 2);
3983 
3984 	argv = calloc(argc, sizeof(char *));
3985 	if (argv == NULL)
3986 		err(1, "calloc");
3987 	argv[0] = strdup(arg0);
3988 	if (argv[0] == NULL)
3989 		err(1, "calloc");
3990 	if (arg1) {
3991 		argv[1] = strdup(arg1);
3992 		if (argv[1] == NULL)
3993 			err(1, "calloc");
3994 	}
3995 
3996 	return argv;
3997 }
3998 
3999 int
4000 main(int argc, char *argv[])
4001 {
4002 	const struct got_error *error = NULL;
4003 	struct tog_cmd *cmd = NULL;
4004 	int ch, hflag = 0;
4005 	char **cmd_argv = NULL;
4006 
4007 	setlocale(LC_CTYPE, "");
4008 
4009 	while ((ch = getopt(argc, argv, "h")) != -1) {
4010 		switch (ch) {
4011 		case 'h':
4012 			hflag = 1;
4013 			break;
4014 		default:
4015 			usage();
4016 			/* NOTREACHED */
4017 		}
4018 	}
4019 
4020 	argc -= optind;
4021 	argv += optind;
4022 	optind = 0;
4023 	optreset = 1;
4024 
4025 	if (argc == 0) {
4026 		if (hflag)
4027 			usage();
4028 		/* Build an argument vector which runs a default command. */
4029 		cmd = &tog_commands[0];
4030 		cmd_argv = make_argv(cmd->name, NULL);
4031 		argc = 1;
4032 	} else {
4033 		int i;
4034 
4035 		/* Did the user specific a command? */
4036 		for (i = 0; i < nitems(tog_commands); i++) {
4037 			if (strncmp(tog_commands[i].name, argv[0],
4038 			    strlen(argv[0])) == 0) {
4039 				cmd = &tog_commands[i];
4040 				if (hflag)
4041 					tog_commands[i].cmd_usage();
4042 				break;
4043 			}
4044 		}
4045 		if (cmd == NULL) {
4046 			/* Did the user specify a repository? */
4047 			char *repo_path = realpath(argv[0], NULL);
4048 			if (repo_path) {
4049 				struct got_repository *repo;
4050 				error = got_repo_open(&repo, repo_path);
4051 				if (error == NULL)
4052 					got_repo_close(repo);
4053 			} else
4054 				error = got_error_prefix_errno2("realpath",
4055 				    argv[0]);
4056 			if (error) {
4057 				if (hflag) {
4058 					fprintf(stderr, "%s: '%s' is not a "
4059 					    "known command\n", getprogname(),
4060 					    argv[0]);
4061 					usage();
4062 				}
4063 				fprintf(stderr, "%s: '%s' is neither a known "
4064 				    "command nor a path to a repository\n",
4065 				    getprogname(), argv[0]);
4066 				free(repo_path);
4067 				return 1;
4068 			}
4069 			cmd = &tog_commands[0];
4070 			cmd_argv = make_argv(cmd->name, repo_path);
4071 			argc = 2;
4072 			free(repo_path);
4073 		}
4074 	}
4075 
4076 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4077 	if (error)
4078 		goto done;
4079 done:
4080 	endwin();
4081 	free(cmd_argv);
4082 	if (error)
4083 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4084 	return 0;
4085 }