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_from_errno();
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_from_errno();
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_from_errno();
437 	if (replace_panel(view->panel, view->window) == ERR)
438 		return got_error_from_errno();
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_from_errno();
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_from_errno(); /* give up */
813 			goto done;
814 		}
815 	}
816 
817 	*ws = calloc(*wlen + 1, sizeof(*ws));
818 	if (*ws == NULL) {
819 		err = got_error_from_errno();
820 		goto done;
821 	}
822 
823 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
824 		err = got_error_from_errno();
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_from_errno();
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, "heads/", 6) == 0)
906 			name += 6;
907 		if (strncmp(name, "remotes/", 8) == 0)
908 			name += 8;
909 		s = *refs_str;
910 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
911 		    s ? ", " : "", name) == -1) {
912 			err = got_error_from_errno();
913 			free(s);
914 			*refs_str = NULL;
915 			break;
916 		}
917 		free(s);
918 	}
919 
920 	return err;
921 }
922 
923 static const struct got_error *
924 format_author(wchar_t **wauthor, int *author_width, char *author, int limit)
925 {
926 	char *smallerthan, *at;
927 
928 	smallerthan = strchr(author, '<');
929 	if (smallerthan && smallerthan[1] != '\0')
930 		author = smallerthan + 1;
931 	at = strchr(author, '@');
932 	if (at)
933 		*at = '\0';
934 	return format_line(wauthor, author_width, author, limit);
935 }
936 
937 static const struct got_error *
938 draw_commit(struct tog_view *view, struct got_commit_object *commit,
939     struct got_object_id *id, struct got_reflist_head *refs,
940     int author_display_cols)
941 {
942 	const struct got_error *err = NULL;
943 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
944 	char *logmsg0 = NULL, *logmsg = NULL;
945 	char *author = NULL;
946 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
947 	int author_width, logmsg_width;
948 	char *newline, *line = NULL;
949 	int col, limit;
950 	static const size_t date_display_cols = 9;
951 	const int avail = view->ncols;
952 	struct tm tm;
953 	time_t committer_time;
954 
955 	committer_time = got_object_commit_get_committer_time(commit);
956 	if (localtime_r(&committer_time, &tm) == NULL)
957 		return got_error_from_errno();
958 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
959 	    >= sizeof(datebuf))
960 		return got_error(GOT_ERR_NO_SPACE);
961 
962 	if (avail < date_display_cols)
963 		limit = MIN(sizeof(datebuf) - 1, avail);
964 	else
965 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
966 	waddnstr(view->window, datebuf, limit);
967 	col = limit + 1;
968 	if (col > avail)
969 		goto done;
970 
971 	author = strdup(got_object_commit_get_author(commit));
972 	if (author == NULL) {
973 		err = got_error_from_errno();
974 		goto done;
975 	}
976 	err = format_author(&wauthor, &author_width, author, avail - col);
977 	if (err)
978 		goto done;
979 	waddwstr(view->window, wauthor);
980 	col += author_width;
981 	while (col <= avail && author_width < author_display_cols + 2) {
982 		waddch(view->window, ' ');
983 		col++;
984 		author_width++;
985 	}
986 	if (col > avail)
987 		goto done;
988 
989 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
990 	if (logmsg0 == NULL) {
991 		err = got_error_from_errno();
992 		goto done;
993 	}
994 	logmsg = logmsg0;
995 	while (*logmsg == '\n')
996 		logmsg++;
997 	newline = strchr(logmsg, '\n');
998 	if (newline)
999 		*newline = '\0';
1000 	limit = avail - col;
1001 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
1002 	if (err)
1003 		goto done;
1004 	waddwstr(view->window, wlogmsg);
1005 	col += logmsg_width;
1006 	while (col <= avail) {
1007 		waddch(view->window, ' ');
1008 		col++;
1009 	}
1010 done:
1011 	free(logmsg0);
1012 	free(wlogmsg);
1013 	free(author);
1014 	free(wauthor);
1015 	free(line);
1016 	return err;
1017 }
1018 
1019 static struct commit_queue_entry *
1020 alloc_commit_queue_entry(struct got_commit_object *commit,
1021     struct got_object_id *id)
1022 {
1023 	struct commit_queue_entry *entry;
1024 
1025 	entry = calloc(1, sizeof(*entry));
1026 	if (entry == NULL)
1027 		return NULL;
1028 
1029 	entry->id = id;
1030 	entry->commit = commit;
1031 	return entry;
1032 }
1033 
1034 static void
1035 pop_commit(struct commit_queue *commits)
1036 {
1037 	struct commit_queue_entry *entry;
1038 
1039 	entry = TAILQ_FIRST(&commits->head);
1040 	TAILQ_REMOVE(&commits->head, entry, entry);
1041 	got_object_commit_close(entry->commit);
1042 	commits->ncommits--;
1043 	/* Don't free entry->id! It is owned by the commit graph. */
1044 	free(entry);
1045 }
1046 
1047 static void
1048 free_commits(struct commit_queue *commits)
1049 {
1050 	while (!TAILQ_EMPTY(&commits->head))
1051 		pop_commit(commits);
1052 }
1053 
1054 static const struct got_error *
1055 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
1056     int minqueue, struct got_repository *repo, const char *path)
1057 {
1058 	const struct got_error *err = NULL;
1059 	int nqueued = 0;
1060 
1061 	/*
1062 	 * We keep all commits open throughout the lifetime of the log
1063 	 * view in order to avoid having to re-fetch commits from disk
1064 	 * while updating the display.
1065 	 */
1066 	while (nqueued < minqueue) {
1067 		struct got_object_id *id;
1068 		struct got_commit_object *commit;
1069 		struct commit_queue_entry *entry;
1070 		int errcode;
1071 
1072 		err = got_commit_graph_iter_next(&id, graph);
1073 		if (err) {
1074 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1075 				break;
1076 			err = got_commit_graph_fetch_commits(graph,
1077 			    minqueue, repo);
1078 			if (err)
1079 				return err;
1080 			continue;
1081 		}
1082 
1083 		if (id == NULL)
1084 			break;
1085 
1086 		err = got_object_open_as_commit(&commit, repo, id);
1087 		if (err)
1088 			break;
1089 		entry = alloc_commit_queue_entry(commit, id);
1090 		if (entry == NULL) {
1091 			err = got_error_from_errno();
1092 			break;
1093 		}
1094 
1095 		errcode = pthread_mutex_lock(&tog_mutex);
1096 		if (errcode) {
1097 			err = got_error_set_errno(errcode);
1098 			break;
1099 		}
1100 
1101 		entry->idx = commits->ncommits;
1102 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1103 		nqueued++;
1104 		commits->ncommits++;
1105 
1106 		errcode = pthread_mutex_unlock(&tog_mutex);
1107 		if (errcode && err == NULL)
1108 			err = got_error_set_errno(errcode);
1109 	}
1110 
1111 	return err;
1112 }
1113 
1114 static const struct got_error *
1115 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
1116 {
1117 	const struct got_error *err = NULL;
1118 	struct got_reference *head_ref;
1119 
1120 	*head_id = NULL;
1121 
1122 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1123 	if (err)
1124 		return err;
1125 
1126 	err = got_ref_resolve(head_id, repo, head_ref);
1127 	got_ref_close(head_ref);
1128 	if (err) {
1129 		*head_id = NULL;
1130 		return err;
1131 	}
1132 
1133 	return NULL;
1134 }
1135 
1136 static const struct got_error *
1137 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1138     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1139     struct commit_queue *commits, int selected_idx, int limit,
1140     struct got_reflist_head *refs, const char *path, int commits_needed)
1141 {
1142 	const struct got_error *err = NULL;
1143 	struct commit_queue_entry *entry;
1144 	int ncommits, width;
1145 	int author_cols = 10;
1146 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1147 	char *refs_str = NULL;
1148 	wchar_t *wline;
1149 
1150 	entry = first;
1151 	ncommits = 0;
1152 	while (entry) {
1153 		if (ncommits == selected_idx) {
1154 			*selected = entry;
1155 			break;
1156 		}
1157 		entry = TAILQ_NEXT(entry, entry);
1158 		ncommits++;
1159 	}
1160 
1161 	if (*selected) {
1162 		err = got_object_id_str(&id_str, (*selected)->id);
1163 		if (err)
1164 			return err;
1165 		if (refs) {
1166 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1167 			if (err)
1168 				goto done;
1169 		}
1170 	}
1171 
1172 	if (commits_needed == 0)
1173 		halfdelay(10); /* disable fast refresh */
1174 
1175 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1176 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1177 	    commits_needed > 0 ? "loading... " :
1178 	    (refs_str ? refs_str : "")) == -1) {
1179 		err = got_error_from_errno();
1180 		goto done;
1181 	}
1182 
1183 	if (path && strcmp(path, "/") != 0) {
1184 		if (asprintf(&header, "commit %s %s%s",
1185 		    id_str ? id_str : "........................................",
1186 		    path, ncommits_str) == -1) {
1187 			err = got_error_from_errno();
1188 			header = NULL;
1189 			goto done;
1190 		}
1191 	} else if (asprintf(&header, "commit %s%s",
1192 	    id_str ? id_str : "........................................",
1193 	    ncommits_str) == -1) {
1194 		err = got_error_from_errno();
1195 		header = NULL;
1196 		goto done;
1197 	}
1198 	err = format_line(&wline, &width, header, view->ncols);
1199 	if (err)
1200 		goto done;
1201 
1202 	werase(view->window);
1203 
1204 	if (view_needs_focus_indication(view))
1205 		wstandout(view->window);
1206 	waddwstr(view->window, wline);
1207 	while (width < view->ncols) {
1208 		waddch(view->window, ' ');
1209 		width++;
1210 	}
1211 	if (view_needs_focus_indication(view))
1212 		wstandend(view->window);
1213 	free(wline);
1214 	if (limit <= 1)
1215 		goto done;
1216 
1217 	/* Grow author column size if necessary. */
1218 	entry = first;
1219 	ncommits = 0;
1220 	while (entry) {
1221 		char *author;
1222 		wchar_t *wauthor;
1223 		int width;
1224 		if (ncommits >= limit - 1)
1225 			break;
1226 		author = strdup(got_object_commit_get_author(entry->commit));
1227 		if (author == NULL) {
1228 			err = got_error_from_errno();
1229 			goto done;
1230 		}
1231 		err = format_author(&wauthor, &width, author, COLS);
1232 		if (author_cols < width)
1233 			author_cols = width;
1234 		free(wauthor);
1235 		free(author);
1236 		entry = TAILQ_NEXT(entry, entry);
1237 	}
1238 
1239 	entry = first;
1240 	*last = first;
1241 	ncommits = 0;
1242 	while (entry) {
1243 		if (ncommits >= limit - 1)
1244 			break;
1245 		if (ncommits == selected_idx)
1246 			wstandout(view->window);
1247 		err = draw_commit(view, entry->commit, entry->id, refs,
1248 		    author_cols);
1249 		if (ncommits == selected_idx)
1250 			wstandend(view->window);
1251 		if (err)
1252 			break;
1253 		ncommits++;
1254 		*last = entry;
1255 		entry = TAILQ_NEXT(entry, entry);
1256 	}
1257 
1258 	view_vborder(view);
1259 done:
1260 	free(id_str);
1261 	free(refs_str);
1262 	free(ncommits_str);
1263 	free(header);
1264 	return err;
1265 }
1266 
1267 static void
1268 scroll_up(struct tog_view *view,
1269     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1270     struct commit_queue *commits)
1271 {
1272 	struct commit_queue_entry *entry;
1273 	int nscrolled = 0;
1274 
1275 	entry = TAILQ_FIRST(&commits->head);
1276 	if (*first_displayed_entry == entry) {
1277 		view_flash(view);
1278 		return;
1279 	}
1280 
1281 	entry = *first_displayed_entry;
1282 	while (entry && nscrolled < maxscroll) {
1283 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1284 		if (entry) {
1285 			*first_displayed_entry = entry;
1286 			nscrolled++;
1287 		}
1288 	}
1289 }
1290 
1291 static const struct got_error *
1292 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1293     pthread_cond_t *need_commits)
1294 {
1295 	int errcode;
1296 	int max_wait = 20;
1297 
1298 	halfdelay(1); /* fast refresh while loading commits */
1299 
1300 	while (*commits_needed > 0) {
1301 		if (*log_complete)
1302 			break;
1303 
1304 		/* Wake the log thread. */
1305 		errcode = pthread_cond_signal(need_commits);
1306 		if (errcode)
1307 			return got_error_set_errno(errcode);
1308 		errcode = pthread_mutex_unlock(&tog_mutex);
1309 		if (errcode)
1310 			return got_error_set_errno(errcode);
1311 		pthread_yield();
1312 		errcode = pthread_mutex_lock(&tog_mutex);
1313 		if (errcode)
1314 			return got_error_set_errno(errcode);
1315 
1316 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1317 			/*
1318 			 * Thread is not done yet; lose a key press
1319 			 * and let the user retry... this way the GUI
1320 			 * remains interactive while logging deep paths
1321 			 * with few commits in history.
1322 			 */
1323 			return NULL;
1324 		}
1325 	}
1326 
1327 	return NULL;
1328 }
1329 
1330 static const struct got_error *
1331 scroll_down(struct tog_view *view,
1332     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1333     struct commit_queue_entry **last_displayed_entry,
1334     struct commit_queue *commits, int *log_complete, int *commits_needed,
1335     pthread_cond_t *need_commits)
1336 {
1337 	const struct got_error *err = NULL;
1338 	struct commit_queue_entry *pentry;
1339 	int nscrolled = 0;
1340 
1341 	if (*last_displayed_entry == NULL)
1342 		return NULL;
1343 
1344 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1345 	if (pentry == NULL && !*log_complete) {
1346 		/*
1347 		 * Ask the log thread for required amount of commits
1348 		 * plus some amount of pre-fetching.
1349 		 */
1350 		(*commits_needed) += maxscroll + 20;
1351 		err = trigger_log_thread(0, commits_needed, log_complete,
1352 		    need_commits);
1353 		if (err)
1354 			return err;
1355 	}
1356 
1357 	do {
1358 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1359 		if (pentry == NULL) {
1360 			if (*log_complete)
1361 				view_flash(view);
1362 			break;
1363 		}
1364 
1365 		*last_displayed_entry = pentry;
1366 
1367 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1368 		if (pentry == NULL)
1369 			break;
1370 		*first_displayed_entry = pentry;
1371 	} while (++nscrolled < maxscroll);
1372 
1373 	return err;
1374 }
1375 
1376 static const struct got_error *
1377 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1378     struct got_commit_object *commit, struct got_object_id *commit_id,
1379     struct tog_view *log_view, struct got_reflist_head *refs,
1380     struct got_repository *repo)
1381 {
1382 	const struct got_error *err;
1383 	struct got_object_qid *parent_id;
1384 	struct tog_view *diff_view;
1385 
1386 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1387 	if (diff_view == NULL)
1388 		return got_error_from_errno();
1389 
1390 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1391 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1392 	    commit_id, log_view, refs, repo);
1393 	if (err == NULL)
1394 		*new_view = diff_view;
1395 	return err;
1396 }
1397 
1398 static const struct got_error *
1399 browse_commit(struct tog_view **new_view, int begin_x,
1400     struct commit_queue_entry *entry, struct got_reflist_head *refs,
1401     struct got_repository *repo)
1402 {
1403 	const struct got_error *err = NULL;
1404 	struct got_tree_object *tree;
1405 	struct tog_view *tree_view;
1406 
1407 	err = got_object_open_as_tree(&tree, repo,
1408 	    got_object_commit_get_tree_id(entry->commit));
1409 	if (err)
1410 		return err;
1411 
1412 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1413 	if (tree_view == NULL)
1414 		return got_error_from_errno();
1415 
1416 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1417 	if (err)
1418 		got_object_tree_close(tree);
1419 	else
1420 		*new_view = tree_view;
1421 	return err;
1422 }
1423 
1424 static void *
1425 log_thread(void *arg)
1426 {
1427 	const struct got_error *err = NULL;
1428 	int errcode = 0;
1429 	struct tog_log_thread_args *a = arg;
1430 	int done = 0;
1431 
1432 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1433 	if (err)
1434 		return (void *)err;
1435 
1436 	while (!done && !err) {
1437 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1438 		    a->in_repo_path);
1439 		if (err) {
1440 			if (err->code != GOT_ERR_ITER_COMPLETED)
1441 				return (void *)err;
1442 			err = NULL;
1443 			done = 1;
1444 		} else if (a->commits_needed > 0)
1445 			a->commits_needed--;
1446 
1447 		errcode = pthread_mutex_lock(&tog_mutex);
1448 		if (errcode)
1449 			return (void *)got_error_set_errno(errcode);
1450 
1451 		if (done)
1452 			a->log_complete = 1;
1453 		else if (*a->quit) {
1454 			done = 1;
1455 			a->log_complete = 1;
1456 		} else if (*a->first_displayed_entry == NULL) {
1457 			*a->first_displayed_entry =
1458 			    TAILQ_FIRST(&a->commits->head);
1459 			*a->selected_entry = *a->first_displayed_entry;
1460 		}
1461 
1462 		if (done)
1463 			a->commits_needed = 0;
1464 		else if (a->commits_needed == 0) {
1465 			errcode = pthread_cond_wait(&a->need_commits,
1466 			    &tog_mutex);
1467 			if (errcode)
1468 				err = got_error_set_errno(errcode);
1469 		}
1470 
1471 		errcode = pthread_mutex_unlock(&tog_mutex);
1472 		if (errcode && err == NULL)
1473 			err = got_error_set_errno(errcode);
1474 	}
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_from_errno();
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_from_errno();
1759 				err = open_log_view(lv, s->start_id, s->refs,
1760 				    s->repo, parent_path, 0);
1761 				if (err)
1762 					return err;;
1763 				if (view_is_parent_view(view))
1764 					*new_view = lv;
1765 				else {
1766 					view_set_child(view->parent, lv);
1767 					*focus_view = lv;
1768 				}
1769 				return NULL;
1770 			}
1771 			break;
1772 		default:
1773 			break;
1774 	}
1775 
1776 	return err;
1777 }
1778 
1779 static const struct got_error *
1780 apply_unveil(const char *repo_path, const char *worktree_path)
1781 {
1782 	const struct got_error *error;
1783 
1784 	if (repo_path && unveil(repo_path, "r") != 0)
1785 		return got_error_from_errno();
1786 
1787 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1788 		return got_error_from_errno();
1789 
1790 	if (unveil("/tmp", "rwc") != 0)
1791 		return got_error_from_errno();
1792 
1793 	error = got_privsep_unveil_exec_helpers();
1794 	if (error != NULL)
1795 		return error;
1796 
1797 	if (unveil(NULL, NULL) != 0)
1798 		return got_error_from_errno();
1799 
1800 	return NULL;
1801 }
1802 
1803 static void
1804 init_curses(void)
1805 {
1806 	initscr();
1807 	cbreak();
1808 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1809 	noecho();
1810 	nonl();
1811 	intrflush(stdscr, FALSE);
1812 	keypad(stdscr, TRUE);
1813 	curs_set(0);
1814 	signal(SIGWINCH, tog_sigwinch);
1815 }
1816 
1817 static const struct got_error *
1818 cmd_log(int argc, char *argv[])
1819 {
1820 	const struct got_error *error;
1821 	struct got_repository *repo = NULL;
1822 	struct got_worktree *worktree = NULL;
1823 	struct got_reflist_head refs;
1824 	struct got_object_id *start_id = NULL;
1825 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1826 	char *start_commit = NULL;
1827 	int ch;
1828 	struct tog_view *view;
1829 
1830 #ifndef PROFILE
1831 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1832 	    NULL) == -1)
1833 		err(1, "pledge");
1834 #endif
1835 
1836 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1837 		switch (ch) {
1838 		case 'c':
1839 			start_commit = optarg;
1840 			break;
1841 		case 'r':
1842 			repo_path = realpath(optarg, NULL);
1843 			if (repo_path == NULL)
1844 				err(1, "-r option");
1845 			break;
1846 		default:
1847 			usage_log();
1848 			/* NOTREACHED */
1849 		}
1850 	}
1851 
1852 	argc -= optind;
1853 	argv += optind;
1854 
1855 	if (argc == 0)
1856 		path = strdup("");
1857 	else if (argc == 1)
1858 		path = strdup(argv[0]);
1859 	else
1860 		usage_log();
1861 	if (path == NULL)
1862 		return got_error_from_errno();
1863 
1864 	cwd = getcwd(NULL, 0);
1865 	if (cwd == NULL) {
1866 		error = got_error_from_errno();
1867 		goto done;
1868 	}
1869 	if (repo_path == NULL) {
1870 		error = got_worktree_open(&worktree, cwd);
1871 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
1872 			goto done;
1873 		if (worktree) {
1874 			repo_path =
1875 			    strdup(got_worktree_get_repo_path(worktree));
1876 		} else
1877 			repo_path = strdup(cwd);
1878 		if (repo_path == NULL) {
1879 			error = got_error_from_errno();
1880 			goto done;
1881 		}
1882 	}
1883 
1884 	init_curses();
1885 
1886 	error = apply_unveil(repo_path,
1887 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1888 	if (error)
1889 		goto done;
1890 
1891 	error = got_repo_open(&repo, repo_path);
1892 	if (error != NULL)
1893 		goto done;
1894 
1895 	if (start_commit == NULL)
1896 		error = get_head_commit_id(&start_id, repo);
1897 	else
1898 		error = got_object_resolve_id_str(&start_id, repo,
1899 		    start_commit);
1900 	if (error != NULL)
1901 		goto done;
1902 
1903 	SIMPLEQ_INIT(&refs);
1904 	error = got_ref_list(&refs, repo);
1905 	if (error)
1906 		goto done;
1907 
1908 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1909 	if (view == NULL) {
1910 		error = got_error_from_errno();
1911 		goto done;
1912 	}
1913 	error = open_log_view(view, start_id, &refs, repo, path, 1);
1914 	if (error)
1915 		goto done;
1916 	error = view_loop(view);
1917 done:
1918 	free(repo_path);
1919 	free(cwd);
1920 	free(path);
1921 	free(start_id);
1922 	if (repo)
1923 		got_repo_close(repo);
1924 	if (worktree)
1925 		got_worktree_close(worktree);
1926 	return error;
1927 }
1928 
1929 __dead static void
1930 usage_diff(void)
1931 {
1932 	endwin();
1933 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1934 	    getprogname());
1935 	exit(1);
1936 }
1937 
1938 static char *
1939 parse_next_line(FILE *f, size_t *len)
1940 {
1941 	char *line;
1942 	size_t linelen;
1943 	size_t lineno;
1944 	const char delim[3] = { '\0', '\0', '\0'};
1945 
1946 	line = fparseln(f, &linelen, &lineno, delim, 0);
1947 	if (len)
1948 		*len = linelen;
1949 	return line;
1950 }
1951 
1952 static const struct got_error *
1953 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1954     int *last_displayed_line, int *eof, int max_lines,
1955     char * header)
1956 {
1957 	const struct got_error *err;
1958 	int nlines = 0, nprinted = 0;
1959 	char *line;
1960 	size_t len;
1961 	wchar_t *wline;
1962 	int width;
1963 
1964 	rewind(f);
1965 	werase(view->window);
1966 
1967 	if (header) {
1968 		err = format_line(&wline, &width, header, view->ncols);
1969 		if (err) {
1970 			return err;
1971 		}
1972 
1973 		if (view_needs_focus_indication(view))
1974 			wstandout(view->window);
1975 		waddwstr(view->window, wline);
1976 		if (view_needs_focus_indication(view))
1977 			wstandend(view->window);
1978 		if (width < view->ncols)
1979 			waddch(view->window, '\n');
1980 
1981 		if (max_lines <= 1)
1982 			return NULL;
1983 		max_lines--;
1984 	}
1985 
1986 	*eof = 0;
1987 	while (nprinted < max_lines) {
1988 		line = parse_next_line(f, &len);
1989 		if (line == NULL) {
1990 			*eof = 1;
1991 			break;
1992 		}
1993 		if (++nlines < *first_displayed_line) {
1994 			free(line);
1995 			continue;
1996 		}
1997 
1998 		err = format_line(&wline, &width, line, view->ncols);
1999 		if (err) {
2000 			free(line);
2001 			return err;
2002 		}
2003 		waddwstr(view->window, wline);
2004 		if (width < view->ncols)
2005 			waddch(view->window, '\n');
2006 		if (++nprinted == 1)
2007 			*first_displayed_line = nlines;
2008 		free(line);
2009 		free(wline);
2010 		wline = NULL;
2011 	}
2012 	*last_displayed_line = nlines;
2013 
2014 	view_vborder(view);
2015 
2016 	return NULL;
2017 }
2018 
2019 static char *
2020 get_datestr(time_t *time, char *datebuf)
2021 {
2022 	char *p, *s = ctime_r(time, datebuf);
2023 	p = strchr(s, '\n');
2024 	if (p)
2025 		*p = '\0';
2026 	return s;
2027 }
2028 
2029 static const struct got_error *
2030 write_commit_info(struct got_object_id *commit_id,
2031     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2032 {
2033 	const struct got_error *err = NULL;
2034 	char datebuf[26];
2035 	struct got_commit_object *commit;
2036 	char *id_str = NULL;
2037 	time_t committer_time;
2038 	const char *author, *committer;
2039 	char *refs_str = NULL;
2040 
2041 	if (refs) {
2042 		err = build_refs_str(&refs_str, refs, commit_id);
2043 		if (err)
2044 			return err;
2045 	}
2046 
2047 	err = got_object_open_as_commit(&commit, repo, commit_id);
2048 	if (err)
2049 		return err;
2050 
2051 	err = got_object_id_str(&id_str, commit_id);
2052 	if (err) {
2053 		err = got_error_from_errno();
2054 		goto done;
2055 	}
2056 
2057 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2058 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2059 		err = got_error_from_errno();
2060 		goto done;
2061 	}
2062 	if (fprintf(outfile, "from: %s\n",
2063 	    got_object_commit_get_author(commit)) < 0) {
2064 		err = got_error_from_errno();
2065 		goto done;
2066 	}
2067 	committer_time = got_object_commit_get_committer_time(commit);
2068 	if (fprintf(outfile, "date: %s UTC\n",
2069 	    get_datestr(&committer_time, datebuf)) < 0) {
2070 		err = got_error_from_errno();
2071 		goto done;
2072 	}
2073 	author = got_object_commit_get_author(commit);
2074 	committer = got_object_commit_get_committer(commit);
2075 	if (strcmp(author, committer) != 0 &&
2076 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2077 		err = got_error_from_errno();
2078 		goto done;
2079 	}
2080 	if (fprintf(outfile, "%s\n",
2081 	    got_object_commit_get_logmsg(commit)) < 0) {
2082 		err = got_error_from_errno();
2083 		goto done;
2084 	}
2085 done:
2086 	free(id_str);
2087 	free(refs_str);
2088 	got_object_commit_close(commit);
2089 	return err;
2090 }
2091 
2092 static const struct got_error *
2093 create_diff(struct tog_diff_view_state *s)
2094 {
2095 	const struct got_error *err = NULL;
2096 	FILE *f = NULL;
2097 	int obj_type;
2098 
2099 	f = got_opentemp();
2100 	if (f == NULL) {
2101 		err = got_error_from_errno();
2102 		goto done;
2103 	}
2104 	if (s->f && fclose(s->f) != 0) {
2105 		err = got_error_from_errno();
2106 		goto done;
2107 	}
2108 	s->f = f;
2109 
2110 	if (s->id1)
2111 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2112 	else
2113 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2114 	if (err)
2115 		goto done;
2116 
2117 	switch (obj_type) {
2118 	case GOT_OBJ_TYPE_BLOB:
2119 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2120 		    s->diff_context, s->repo, f);
2121 		break;
2122 	case GOT_OBJ_TYPE_TREE:
2123 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2124 		    s->diff_context, s->repo, f);
2125 		break;
2126 	case GOT_OBJ_TYPE_COMMIT: {
2127 		const struct got_object_id_queue *parent_ids;
2128 		struct got_object_qid *pid;
2129 		struct got_commit_object *commit2;
2130 
2131 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2132 		if (err)
2133 			break;
2134 		/* Show commit info if we're diffing to a parent/root commit. */
2135 		if (s->id1 == NULL)
2136 			write_commit_info(s->id2, s->refs, s->repo, f);
2137 		else {
2138 			parent_ids = got_object_commit_get_parent_ids(commit2);
2139 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2140 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2141 					write_commit_info(s->id2, s->refs,
2142 					    s->repo, f);
2143 					break;
2144 				}
2145 			}
2146 		}
2147 		got_object_commit_close(commit2);
2148 
2149 		err = got_diff_objects_as_commits(s->id1, s->id2,
2150 		    s->diff_context, s->repo, f);
2151 		break;
2152 	}
2153 	default:
2154 		err = got_error(GOT_ERR_OBJ_TYPE);
2155 		break;
2156 	}
2157 done:
2158 	if (f && fflush(f) != 0 && err == NULL)
2159 		err = got_error_from_errno();
2160 	return err;
2161 }
2162 
2163 static void
2164 diff_view_indicate_progress(struct tog_view *view)
2165 {
2166 	werase(view->window);
2167 	waddstr(view->window, "diffing...");
2168 	update_panels();
2169 	doupdate();
2170 }
2171 
2172 static const struct got_error *
2173 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2174     struct got_object_id *id2, struct tog_view *log_view,
2175     struct got_reflist_head *refs, struct got_repository *repo)
2176 {
2177 	const struct got_error *err;
2178 
2179 	if (id1 != NULL && id2 != NULL) {
2180 	    int type1, type2;
2181 	    err = got_object_get_type(&type1, repo, id1);
2182 	    if (err)
2183 		return err;
2184 	    err = got_object_get_type(&type2, repo, id2);
2185 	    if (err)
2186 		return err;
2187 
2188 	    if (type1 != type2)
2189 		return got_error(GOT_ERR_OBJ_TYPE);
2190 	}
2191 
2192 	if (id1) {
2193 		view->state.diff.id1 = got_object_id_dup(id1);
2194 		if (view->state.diff.id1 == NULL)
2195 			return got_error_from_errno();
2196 	} else
2197 		view->state.diff.id1 = NULL;
2198 
2199 	view->state.diff.id2 = got_object_id_dup(id2);
2200 	if (view->state.diff.id2 == NULL) {
2201 		free(view->state.diff.id1);
2202 		view->state.diff.id1 = NULL;
2203 		return got_error_from_errno();
2204 	}
2205 	view->state.diff.f = NULL;
2206 	view->state.diff.first_displayed_line = 1;
2207 	view->state.diff.last_displayed_line = view->nlines;
2208 	view->state.diff.diff_context = 3;
2209 	view->state.diff.log_view = log_view;
2210 	view->state.diff.repo = repo;
2211 	view->state.diff.refs = refs;
2212 
2213 	if (log_view && view_is_splitscreen(view))
2214 		show_log_view(log_view); /* draw vborder */
2215 	diff_view_indicate_progress(view);
2216 
2217 	err = create_diff(&view->state.diff);
2218 	if (err) {
2219 		free(view->state.diff.id1);
2220 		view->state.diff.id1 = NULL;
2221 		free(view->state.diff.id2);
2222 		view->state.diff.id2 = NULL;
2223 		return err;
2224 	}
2225 
2226 	view->show = show_diff_view;
2227 	view->input = input_diff_view;
2228 	view->close = close_diff_view;
2229 
2230 	return NULL;
2231 }
2232 
2233 static const struct got_error *
2234 close_diff_view(struct tog_view *view)
2235 {
2236 	const struct got_error *err = NULL;
2237 
2238 	free(view->state.diff.id1);
2239 	view->state.diff.id1 = NULL;
2240 	free(view->state.diff.id2);
2241 	view->state.diff.id2 = NULL;
2242 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2243 		err = got_error_from_errno();
2244 	return err;
2245 }
2246 
2247 static const struct got_error *
2248 show_diff_view(struct tog_view *view)
2249 {
2250 	const struct got_error *err;
2251 	struct tog_diff_view_state *s = &view->state.diff;
2252 	char *id_str1 = NULL, *id_str2, *header;
2253 
2254 	if (s->id1) {
2255 		err = got_object_id_str(&id_str1, s->id1);
2256 		if (err)
2257 			return err;
2258 	}
2259 	err = got_object_id_str(&id_str2, s->id2);
2260 	if (err)
2261 		return err;
2262 
2263 	if (asprintf(&header, "diff %s %s",
2264 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2265 		err = got_error_from_errno();
2266 		free(id_str1);
2267 		free(id_str2);
2268 		return err;
2269 	}
2270 	free(id_str1);
2271 	free(id_str2);
2272 
2273 	return draw_file(view, s->f, &s->first_displayed_line,
2274 	    &s->last_displayed_line, &s->eof, view->nlines,
2275 	    header);
2276 }
2277 
2278 static const struct got_error *
2279 set_selected_commit(struct tog_diff_view_state *s,
2280     struct commit_queue_entry *entry)
2281 {
2282 	const struct got_error *err;
2283 	const struct got_object_id_queue *parent_ids;
2284 	struct got_commit_object *selected_commit;
2285 	struct got_object_qid *pid;
2286 
2287 	free(s->id2);
2288 	s->id2 = got_object_id_dup(entry->id);
2289 	if (s->id2 == NULL)
2290 		return got_error_from_errno();
2291 
2292 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2293 	if (err)
2294 		return err;
2295 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2296 	free(s->id1);
2297 	pid = SIMPLEQ_FIRST(parent_ids);
2298 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2299 	got_object_commit_close(selected_commit);
2300 	return NULL;
2301 }
2302 
2303 static const struct got_error *
2304 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2305     struct tog_view **focus_view, struct tog_view *view, int ch)
2306 {
2307 	const struct got_error *err = NULL;
2308 	struct tog_diff_view_state *s = &view->state.diff;
2309 	struct tog_log_view_state *ls;
2310 	struct commit_queue_entry *entry;
2311 	int i;
2312 
2313 	switch (ch) {
2314 		case 'k':
2315 		case KEY_UP:
2316 			if (s->first_displayed_line > 1)
2317 				s->first_displayed_line--;
2318 			else
2319 				view_flash(view);
2320 			break;
2321 		case KEY_PPAGE:
2322 			if (s->first_displayed_line == 1) {
2323 				view_flash(view);
2324 				break;
2325 			}
2326 			i = 0;
2327 			while (i++ < view->nlines - 1 &&
2328 			    s->first_displayed_line > 1)
2329 				s->first_displayed_line--;
2330 			break;
2331 		case 'j':
2332 		case KEY_DOWN:
2333 			if (!s->eof)
2334 				s->first_displayed_line++;
2335 			else
2336 				view_flash(view);
2337 			break;
2338 		case KEY_NPAGE:
2339 		case ' ':
2340 			if (s->eof) {
2341 				view_flash(view);
2342 				break;
2343 			}
2344 			i = 0;
2345 			while (!s->eof && i++ < view->nlines - 1) {
2346 				char *line;
2347 				line = parse_next_line(s->f, NULL);
2348 				s->first_displayed_line++;
2349 				if (line == NULL)
2350 					break;
2351 			}
2352 			break;
2353 		case '[':
2354 			if (s->diff_context > 0) {
2355 				s->diff_context--;
2356 				diff_view_indicate_progress(view);
2357 				err = create_diff(s);
2358 			}
2359 			break;
2360 		case ']':
2361 			if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2362 				s->diff_context++;
2363 				diff_view_indicate_progress(view);
2364 				err = create_diff(s);
2365 			}
2366 			break;
2367 		case '<':
2368 		case ',':
2369 			if (s->log_view == NULL)
2370 				break;
2371 			ls = &s->log_view->state.log;
2372 			entry = TAILQ_PREV(ls->selected_entry,
2373 			    commit_queue_head, entry);
2374 			if (entry == NULL)
2375 				break;
2376 
2377 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2378 			    KEY_UP);
2379 			if (err)
2380 				break;
2381 
2382 			err = set_selected_commit(s, entry);
2383 			if (err)
2384 				break;
2385 
2386 			s->first_displayed_line = 1;
2387 			s->last_displayed_line = view->nlines;
2388 
2389 			diff_view_indicate_progress(view);
2390 			err = create_diff(s);
2391 			break;
2392 		case '>':
2393 		case '.':
2394 			if (s->log_view == NULL)
2395 				break;
2396 			ls = &s->log_view->state.log;
2397 
2398 			if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2399 				ls->thread_args.commits_needed++;
2400 
2401 				/* Display "loading..." in log view. */
2402 				show_log_view(s->log_view);
2403 				update_panels();
2404 				doupdate();
2405 
2406 				err = trigger_log_thread(1 /* load_all */,
2407 				    &ls->thread_args.commits_needed,
2408 				    &ls->thread_args.log_complete,
2409 				    &ls->thread_args.need_commits);
2410 				if (err)
2411 					break;
2412 			}
2413 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2414 			    KEY_DOWN);
2415 			if (err)
2416 				break;
2417 
2418 			entry = TAILQ_NEXT(ls->selected_entry, entry);
2419 			if (entry == NULL)
2420 				break;
2421 
2422 			err = set_selected_commit(s, entry);
2423 			if (err)
2424 				break;
2425 
2426 			s->first_displayed_line = 1;
2427 			s->last_displayed_line = view->nlines;
2428 
2429 			diff_view_indicate_progress(view);
2430 			err = create_diff(s);
2431 			break;
2432 		default:
2433 			break;
2434 	}
2435 
2436 	return err;
2437 }
2438 
2439 static const struct got_error *
2440 cmd_diff(int argc, char *argv[])
2441 {
2442 	const struct got_error *error = NULL;
2443 	struct got_repository *repo = NULL;
2444 	struct got_reflist_head refs;
2445 	struct got_object_id *id1 = NULL, *id2 = NULL;
2446 	char *repo_path = NULL;
2447 	char *id_str1 = NULL, *id_str2 = NULL;
2448 	int ch;
2449 	struct tog_view *view;
2450 
2451 #ifndef PROFILE
2452 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2453 	    NULL) == -1)
2454 		err(1, "pledge");
2455 #endif
2456 
2457 	while ((ch = getopt(argc, argv, "")) != -1) {
2458 		switch (ch) {
2459 		default:
2460 			usage_diff();
2461 			/* NOTREACHED */
2462 		}
2463 	}
2464 
2465 	argc -= optind;
2466 	argv += optind;
2467 
2468 	if (argc == 0) {
2469 		usage_diff(); /* TODO show local worktree changes */
2470 	} else if (argc == 2) {
2471 		repo_path = getcwd(NULL, 0);
2472 		if (repo_path == NULL)
2473 			return got_error_from_errno();
2474 		id_str1 = argv[0];
2475 		id_str2 = argv[1];
2476 	} else if (argc == 3) {
2477 		repo_path = realpath(argv[0], NULL);
2478 		if (repo_path == NULL)
2479 			return got_error_from_errno();
2480 		id_str1 = argv[1];
2481 		id_str2 = argv[2];
2482 	} else
2483 		usage_diff();
2484 
2485 	init_curses();
2486 
2487 	error = apply_unveil(repo_path, NULL);
2488 	if (error)
2489 		goto done;
2490 
2491 	error = got_repo_open(&repo, repo_path);
2492 	free(repo_path);
2493 	if (error)
2494 		goto done;
2495 
2496 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2497 	if (error)
2498 		goto done;
2499 
2500 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2501 	if (error)
2502 		goto done;
2503 
2504 	SIMPLEQ_INIT(&refs);
2505 	error = got_ref_list(&refs, repo);
2506 	if (error)
2507 		goto done;
2508 
2509 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2510 	if (view == NULL) {
2511 		error = got_error_from_errno();
2512 		goto done;
2513 	}
2514 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2515 	if (error)
2516 		goto done;
2517 	error = view_loop(view);
2518 done:
2519 	got_repo_close(repo);
2520 	return error;
2521 }
2522 
2523 __dead static void
2524 usage_blame(void)
2525 {
2526 	endwin();
2527 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2528 	    getprogname());
2529 	exit(1);
2530 }
2531 
2532 struct tog_blame_line {
2533 	int annotated;
2534 	struct got_object_id *id;
2535 };
2536 
2537 static const struct got_error *
2538 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2539     const char *path, struct tog_blame_line *lines, int nlines,
2540     int blame_complete, int selected_line, int *first_displayed_line,
2541     int *last_displayed_line, int *eof, int max_lines)
2542 {
2543 	const struct got_error *err;
2544 	int lineno = 0, nprinted = 0;
2545 	char *line;
2546 	size_t len;
2547 	wchar_t *wline;
2548 	int width, wlimit;
2549 	struct tog_blame_line *blame_line;
2550 	struct got_object_id *prev_id = NULL;
2551 	char *id_str;
2552 
2553 	err = got_object_id_str(&id_str, id);
2554 	if (err)
2555 		return err;
2556 
2557 	rewind(f);
2558 	werase(view->window);
2559 
2560 	if (asprintf(&line, "commit %s", id_str) == -1) {
2561 		err = got_error_from_errno();
2562 		free(id_str);
2563 		return err;
2564 	}
2565 
2566 	err = format_line(&wline, &width, line, view->ncols);
2567 	free(line);
2568 	line = NULL;
2569 	if (view_needs_focus_indication(view))
2570 		wstandout(view->window);
2571 	waddwstr(view->window, wline);
2572 	if (view_needs_focus_indication(view))
2573 		wstandend(view->window);
2574 	free(wline);
2575 	wline = NULL;
2576 	if (width < view->ncols)
2577 		waddch(view->window, '\n');
2578 
2579 	if (asprintf(&line, "[%d/%d] %s%s",
2580 	    *first_displayed_line - 1 + selected_line, nlines,
2581 	    blame_complete ? "" : "annotating... ", path) == -1) {
2582 		free(id_str);
2583 		return got_error_from_errno();
2584 	}
2585 	free(id_str);
2586 	err = format_line(&wline, &width, line, view->ncols);
2587 	free(line);
2588 	line = NULL;
2589 	if (err)
2590 		return err;
2591 	waddwstr(view->window, wline);
2592 	free(wline);
2593 	wline = NULL;
2594 	if (width < view->ncols)
2595 		waddch(view->window, '\n');
2596 
2597 	*eof = 0;
2598 	while (nprinted < max_lines - 2) {
2599 		line = parse_next_line(f, &len);
2600 		if (line == NULL) {
2601 			*eof = 1;
2602 			break;
2603 		}
2604 		if (++lineno < *first_displayed_line) {
2605 			free(line);
2606 			continue;
2607 		}
2608 
2609 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2610 		err = format_line(&wline, &width, line, wlimit);
2611 		if (err) {
2612 			free(line);
2613 			return err;
2614 		}
2615 
2616 		if (view->focussed && nprinted == selected_line - 1)
2617 			wstandout(view->window);
2618 
2619 		blame_line = &lines[lineno - 1];
2620 		if (blame_line->annotated && prev_id &&
2621 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2622 			waddstr(view->window, "         ");
2623 		else if (blame_line->annotated) {
2624 			char *id_str;
2625 			err = got_object_id_str(&id_str, blame_line->id);
2626 			if (err) {
2627 				free(line);
2628 				free(wline);
2629 				return err;
2630 			}
2631 			wprintw(view->window, "%.8s ", id_str);
2632 			free(id_str);
2633 			prev_id = blame_line->id;
2634 		} else {
2635 			waddstr(view->window, "........ ");
2636 			prev_id = NULL;
2637 		}
2638 
2639 		waddwstr(view->window, wline);
2640 		while (width < wlimit) {
2641 			waddch(view->window, ' ');
2642 			width++;
2643 		}
2644 		if (view->focussed && nprinted == selected_line - 1)
2645 			wstandend(view->window);
2646 		if (++nprinted == 1)
2647 			*first_displayed_line = lineno;
2648 		free(line);
2649 		free(wline);
2650 		wline = NULL;
2651 	}
2652 	*last_displayed_line = lineno;
2653 
2654 	view_vborder(view);
2655 
2656 	return NULL;
2657 }
2658 
2659 static const struct got_error *
2660 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2661 {
2662 	const struct got_error *err = NULL;
2663 	struct tog_blame_cb_args *a = arg;
2664 	struct tog_blame_line *line;
2665 	int errcode;
2666 
2667 	if (nlines != a->nlines ||
2668 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2669 		return got_error(GOT_ERR_RANGE);
2670 
2671 	errcode = pthread_mutex_lock(&tog_mutex);
2672 	if (errcode)
2673 		return got_error_set_errno(errcode);
2674 
2675 	if (*a->quit) {	/* user has quit the blame view */
2676 		err = got_error(GOT_ERR_ITER_COMPLETED);
2677 		goto done;
2678 	}
2679 
2680 	if (lineno == -1)
2681 		goto done; /* no change in this commit */
2682 
2683 	line = &a->lines[lineno - 1];
2684 	if (line->annotated)
2685 		goto done;
2686 
2687 	line->id = got_object_id_dup(id);
2688 	if (line->id == NULL) {
2689 		err = got_error_from_errno();
2690 		goto done;
2691 	}
2692 	line->annotated = 1;
2693 done:
2694 	errcode = pthread_mutex_unlock(&tog_mutex);
2695 	if (errcode)
2696 		err = got_error_set_errno(errcode);
2697 	return err;
2698 }
2699 
2700 static void *
2701 blame_thread(void *arg)
2702 {
2703 	const struct got_error *err;
2704 	struct tog_blame_thread_args *ta = arg;
2705 	struct tog_blame_cb_args *a = ta->cb_args;
2706 	int errcode;
2707 
2708 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2709 	    blame_cb, ta->cb_args);
2710 
2711 	errcode = pthread_mutex_lock(&tog_mutex);
2712 	if (errcode)
2713 		return (void *)got_error_set_errno(errcode);
2714 
2715 	got_repo_close(ta->repo);
2716 	ta->repo = NULL;
2717 	*ta->complete = 1;
2718 
2719 	errcode = pthread_mutex_unlock(&tog_mutex);
2720 	if (errcode && err == NULL)
2721 		err = got_error_set_errno(errcode);
2722 
2723 	return (void *)err;
2724 }
2725 
2726 static struct got_object_id *
2727 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2728     int selected_line)
2729 {
2730 	struct tog_blame_line *line;
2731 
2732 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2733 	if (!line->annotated)
2734 		return NULL;
2735 
2736 	return line->id;
2737 }
2738 
2739 static const struct got_error *
2740 stop_blame(struct tog_blame *blame)
2741 {
2742 	const struct got_error *err = NULL;
2743 	int i;
2744 
2745 	if (blame->thread) {
2746 		int errcode;
2747 		errcode = pthread_mutex_unlock(&tog_mutex);
2748 		if (errcode)
2749 			return got_error_set_errno(errcode);
2750 		errcode = pthread_join(blame->thread, (void **)&err);
2751 		if (errcode)
2752 			return got_error_set_errno(errcode);
2753 		errcode = pthread_mutex_lock(&tog_mutex);
2754 		if (errcode)
2755 			return got_error_set_errno(errcode);
2756 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2757 			err = NULL;
2758 		blame->thread = NULL;
2759 	}
2760 	if (blame->thread_args.repo) {
2761 		got_repo_close(blame->thread_args.repo);
2762 		blame->thread_args.repo = NULL;
2763 	}
2764 	if (blame->f) {
2765 		if (fclose(blame->f) != 0 && err == NULL)
2766 			err = got_error_from_errno();
2767 		blame->f = NULL;
2768 	}
2769 	if (blame->lines) {
2770 		for (i = 0; i < blame->nlines; i++)
2771 			free(blame->lines[i].id);
2772 		free(blame->lines);
2773 		blame->lines = NULL;
2774 	}
2775 	free(blame->cb_args.commit_id);
2776 	blame->cb_args.commit_id = NULL;
2777 
2778 	return err;
2779 }
2780 
2781 static const struct got_error *
2782 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2783     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2784     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2785     struct got_repository *repo)
2786 {
2787 	const struct got_error *err = NULL;
2788 	struct got_blob_object *blob = NULL;
2789 	struct got_repository *thread_repo = NULL;
2790 	struct got_object_id *obj_id = NULL;
2791 	int obj_type;
2792 
2793 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2794 	if (err)
2795 		return err;
2796 	if (obj_id == NULL)
2797 		return got_error(GOT_ERR_NO_OBJ);
2798 
2799 	err = got_object_get_type(&obj_type, repo, obj_id);
2800 	if (err)
2801 		goto done;
2802 
2803 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2804 		err = got_error(GOT_ERR_OBJ_TYPE);
2805 		goto done;
2806 	}
2807 
2808 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2809 	if (err)
2810 		goto done;
2811 	blame->f = got_opentemp();
2812 	if (blame->f == NULL) {
2813 		err = got_error_from_errno();
2814 		goto done;
2815 	}
2816 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2817 	    blame->f, blob);
2818 	if (err)
2819 		goto done;
2820 
2821 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2822 	if (blame->lines == NULL) {
2823 		err = got_error_from_errno();
2824 		goto done;
2825 	}
2826 
2827 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2828 	if (err)
2829 		goto done;
2830 
2831 	blame->cb_args.view = view;
2832 	blame->cb_args.lines = blame->lines;
2833 	blame->cb_args.nlines = blame->nlines;
2834 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2835 	if (blame->cb_args.commit_id == NULL) {
2836 		err = got_error_from_errno();
2837 		goto done;
2838 	}
2839 	blame->cb_args.quit = done;
2840 
2841 	blame->thread_args.path = path;
2842 	blame->thread_args.repo = thread_repo;
2843 	blame->thread_args.cb_args = &blame->cb_args;
2844 	blame->thread_args.complete = blame_complete;
2845 	*blame_complete = 0;
2846 
2847 done:
2848 	if (blob)
2849 		got_object_blob_close(blob);
2850 	free(obj_id);
2851 	if (err)
2852 		stop_blame(blame);
2853 	return err;
2854 }
2855 
2856 static const struct got_error *
2857 open_blame_view(struct tog_view *view, char *path,
2858     struct got_object_id *commit_id, struct got_reflist_head *refs,
2859     struct got_repository *repo)
2860 {
2861 	const struct got_error *err = NULL;
2862 	struct tog_blame_view_state *s = &view->state.blame;
2863 
2864 	SIMPLEQ_INIT(&s->blamed_commits);
2865 
2866 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2867 	if (err)
2868 		return err;
2869 
2870 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2871 	s->first_displayed_line = 1;
2872 	s->last_displayed_line = view->nlines;
2873 	s->selected_line = 1;
2874 	s->blame_complete = 0;
2875 	s->path = path;
2876 	if (s->path == NULL)
2877 		return got_error_from_errno();
2878 	s->repo = repo;
2879 	s->refs = refs;
2880 	s->commit_id = commit_id;
2881 	memset(&s->blame, 0, sizeof(s->blame));
2882 
2883 	view->show = show_blame_view;
2884 	view->input = input_blame_view;
2885 	view->close = close_blame_view;
2886 
2887 	return run_blame(&s->blame, view, &s->blame_complete,
2888 	    &s->first_displayed_line, &s->last_displayed_line,
2889 	    &s->selected_line, &s->done, &s->eof, s->path,
2890 	    s->blamed_commit->id, s->repo);
2891 }
2892 
2893 static const struct got_error *
2894 close_blame_view(struct tog_view *view)
2895 {
2896 	const struct got_error *err = NULL;
2897 	struct tog_blame_view_state *s = &view->state.blame;
2898 
2899 	if (s->blame.thread)
2900 		err = stop_blame(&s->blame);
2901 
2902 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2903 		struct got_object_qid *blamed_commit;
2904 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2905 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2906 		got_object_qid_free(blamed_commit);
2907 	}
2908 
2909 	free(s->path);
2910 
2911 	return err;
2912 }
2913 
2914 static const struct got_error *
2915 show_blame_view(struct tog_view *view)
2916 {
2917 	const struct got_error *err = NULL;
2918 	struct tog_blame_view_state *s = &view->state.blame;
2919 	int errcode;
2920 
2921 	if (s->blame.thread == NULL) {
2922 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2923 		    &s->blame.thread_args);
2924 		if (errcode)
2925 			return got_error_set_errno(errcode);
2926 	}
2927 
2928 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2929 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2930 	    s->selected_line, &s->first_displayed_line,
2931 	    &s->last_displayed_line, &s->eof, view->nlines);
2932 
2933 	view_vborder(view);
2934 	return err;
2935 }
2936 
2937 static const struct got_error *
2938 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2939     struct tog_view **focus_view, struct tog_view *view, int ch)
2940 {
2941 	const struct got_error *err = NULL, *thread_err = NULL;
2942 	struct tog_view *diff_view;
2943 	struct tog_blame_view_state *s = &view->state.blame;
2944 	int begin_x = 0;
2945 
2946 	switch (ch) {
2947 		case 'q':
2948 			s->done = 1;
2949 			break;
2950 		case 'k':
2951 		case KEY_UP:
2952 			if (s->selected_line > 1)
2953 				s->selected_line--;
2954 			else if (s->selected_line == 1 &&
2955 			    s->first_displayed_line > 1)
2956 				s->first_displayed_line--;
2957 			else
2958 				view_flash(view);
2959 			break;
2960 		case KEY_PPAGE:
2961 			if (s->first_displayed_line == 1) {
2962 				if (s->selected_line == 1) {
2963 					view_flash(view);
2964 					break;
2965 				}
2966 				s->selected_line = 1;
2967 				break;
2968 			}
2969 			if (s->first_displayed_line > view->nlines - 2)
2970 				s->first_displayed_line -=
2971 				    (view->nlines - 2);
2972 			else
2973 				s->first_displayed_line = 1;
2974 			break;
2975 		case 'j':
2976 		case KEY_DOWN:
2977 			if (s->selected_line < view->nlines - 2 &&
2978 			    s->first_displayed_line +
2979 			    s->selected_line <= s->blame.nlines)
2980 				s->selected_line++;
2981 			else if (s->last_displayed_line <
2982 			    s->blame.nlines)
2983 				s->first_displayed_line++;
2984 			else
2985 				view_flash(view);
2986 			break;
2987 		case 'b':
2988 		case 'p': {
2989 			struct got_object_id *id = NULL;
2990 			id = get_selected_commit_id(s->blame.lines,
2991 			    s->first_displayed_line, s->selected_line);
2992 			if (id == NULL)
2993 				break;
2994 			if (ch == 'p') {
2995 				struct got_commit_object *commit;
2996 				struct got_object_qid *pid;
2997 				struct got_object_id *blob_id = NULL;
2998 				int obj_type;
2999 				err = got_object_open_as_commit(&commit,
3000 				    s->repo, id);
3001 				if (err)
3002 					break;
3003 				pid = SIMPLEQ_FIRST(
3004 				    got_object_commit_get_parent_ids(commit));
3005 				if (pid == NULL) {
3006 					got_object_commit_close(commit);
3007 					break;
3008 				}
3009 				/* Check if path history ends here. */
3010 				err = got_object_id_by_path(&blob_id, s->repo,
3011 				    pid->id, s->path);
3012 				if (err) {
3013 					if (err->code == GOT_ERR_NO_TREE_ENTRY)
3014 						err = NULL;
3015 					got_object_commit_close(commit);
3016 					break;
3017 				}
3018 				err = got_object_get_type(&obj_type, s->repo,
3019 				    blob_id);
3020 				free(blob_id);
3021 				/* Can't blame non-blob type objects. */
3022 				if (obj_type != GOT_OBJ_TYPE_BLOB) {
3023 					got_object_commit_close(commit);
3024 					break;
3025 				}
3026 				err = got_object_qid_alloc(&s->blamed_commit,
3027 				    pid->id);
3028 				got_object_commit_close(commit);
3029 			} else {
3030 				if (got_object_id_cmp(id,
3031 				    s->blamed_commit->id) == 0)
3032 					break;
3033 				err = got_object_qid_alloc(&s->blamed_commit,
3034 				    id);
3035 			}
3036 			if (err)
3037 				break;
3038 			s->done = 1;
3039 			thread_err = stop_blame(&s->blame);
3040 			s->done = 0;
3041 			if (thread_err)
3042 				break;
3043 			SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3044 			    s->blamed_commit, entry);
3045 			err = run_blame(&s->blame, view, &s->blame_complete,
3046 			    &s->first_displayed_line, &s->last_displayed_line,
3047 			    &s->selected_line, &s->done, &s->eof,
3048 			    s->path, s->blamed_commit->id, s->repo);
3049 			if (err)
3050 				break;
3051 			break;
3052 		}
3053 		case 'B': {
3054 			struct got_object_qid *first;
3055 			first = SIMPLEQ_FIRST(&s->blamed_commits);
3056 			if (!got_object_id_cmp(first->id, s->commit_id))
3057 				break;
3058 			s->done = 1;
3059 			thread_err = stop_blame(&s->blame);
3060 			s->done = 0;
3061 			if (thread_err)
3062 				break;
3063 			SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3064 			got_object_qid_free(s->blamed_commit);
3065 			s->blamed_commit =
3066 			    SIMPLEQ_FIRST(&s->blamed_commits);
3067 			err = run_blame(&s->blame, view, &s->blame_complete,
3068 			    &s->first_displayed_line, &s->last_displayed_line,
3069 			    &s->selected_line, &s->done, &s->eof, s->path,
3070 			    s->blamed_commit->id, s->repo);
3071 			if (err)
3072 				break;
3073 			break;
3074 		}
3075 		case KEY_ENTER:
3076 		case '\r': {
3077 			struct got_object_id *id = NULL;
3078 			struct got_object_qid *pid;
3079 			struct got_commit_object *commit = NULL;
3080 			id = get_selected_commit_id(s->blame.lines,
3081 			    s->first_displayed_line, s->selected_line);
3082 			if (id == NULL)
3083 				break;
3084 			err = got_object_open_as_commit(&commit, s->repo, id);
3085 			if (err)
3086 				break;
3087 			pid = SIMPLEQ_FIRST(
3088 			    got_object_commit_get_parent_ids(commit));
3089 			if (view_is_parent_view(view))
3090 			    begin_x = view_split_begin_x(view->begin_x);
3091 			diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3092 			if (diff_view == NULL) {
3093 				got_object_commit_close(commit);
3094 				err = got_error_from_errno();
3095 				break;
3096 			}
3097 			err = open_diff_view(diff_view, pid ? pid->id : NULL,
3098 			    id, NULL, s->refs, s->repo);
3099 			got_object_commit_close(commit);
3100 			if (err) {
3101 				view_close(diff_view);
3102 				break;
3103 			}
3104 			if (view_is_parent_view(view)) {
3105 				err = view_close_child(view);
3106 				if (err)
3107 					break;
3108 				err = view_set_child(view, diff_view);
3109 				if (err) {
3110 					view_close(diff_view);
3111 					break;
3112 				}
3113 				*focus_view = diff_view;
3114 				view->child_focussed = 1;
3115 			} else
3116 				*new_view = diff_view;
3117 			if (err)
3118 				break;
3119 			break;
3120 		}
3121 		case KEY_NPAGE:
3122 		case ' ':
3123 			if (s->last_displayed_line >= s->blame.nlines &&
3124 			    s->selected_line >= MIN(s->blame.nlines,
3125 			        view->nlines - 2)) {
3126 				view_flash(view);
3127 				break;
3128 			}
3129 			if (s->last_displayed_line >= s->blame.nlines &&
3130 			    s->selected_line < view->nlines - 2) {
3131 				s->selected_line = MIN(s->blame.nlines,
3132 				    view->nlines - 2);
3133 				break;
3134 			}
3135 			if (s->last_displayed_line + view->nlines - 2
3136 			    <= s->blame.nlines)
3137 				s->first_displayed_line +=
3138 				    view->nlines - 2;
3139 			else
3140 				s->first_displayed_line =
3141 				    s->blame.nlines -
3142 				    (view->nlines - 3);
3143 			break;
3144 		case KEY_RESIZE:
3145 			if (s->selected_line > view->nlines - 2) {
3146 				s->selected_line = MIN(s->blame.nlines,
3147 				    view->nlines - 2);
3148 			}
3149 			break;
3150 		default:
3151 			break;
3152 	}
3153 	return thread_err ? thread_err : err;
3154 }
3155 
3156 static const struct got_error *
3157 cmd_blame(int argc, char *argv[])
3158 {
3159 	const struct got_error *error;
3160 	struct got_repository *repo = NULL;
3161 	struct got_reflist_head refs;
3162 	struct got_worktree *worktree = NULL;
3163 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3164 	struct got_object_id *commit_id = NULL;
3165 	char *commit_id_str = NULL;
3166 	int ch;
3167 	struct tog_view *view;
3168 
3169 #ifndef PROFILE
3170 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3171 	    NULL) == -1)
3172 		err(1, "pledge");
3173 #endif
3174 
3175 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3176 		switch (ch) {
3177 		case 'c':
3178 			commit_id_str = optarg;
3179 			break;
3180 		case 'r':
3181 			repo_path = realpath(optarg, NULL);
3182 			if (repo_path == NULL)
3183 				err(1, "-r option");
3184 			break;
3185 		default:
3186 			usage_blame();
3187 			/* NOTREACHED */
3188 		}
3189 	}
3190 
3191 	argc -= optind;
3192 	argv += optind;
3193 
3194 	if (argc == 1)
3195 		path = argv[0];
3196 	else
3197 		usage_blame();
3198 
3199 	cwd = getcwd(NULL, 0);
3200 	if (cwd == NULL) {
3201 		error = got_error_from_errno();
3202 		goto done;
3203 	}
3204 	if (repo_path == NULL) {
3205 		error = got_worktree_open(&worktree, cwd);
3206 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3207 			goto done;
3208 		else
3209 			error = NULL;
3210 		if (worktree) {
3211 			repo_path =
3212 			    strdup(got_worktree_get_repo_path(worktree));
3213 			if (repo_path == NULL)
3214 				error = got_error_from_errno();
3215 			if (error)
3216 				goto done;
3217 		} else {
3218 			repo_path = strdup(cwd);
3219 			if (repo_path == NULL) {
3220 				error = got_error_from_errno();
3221 				goto done;
3222 			}
3223 		}
3224 	}
3225 
3226 	init_curses();
3227 
3228 	error = apply_unveil(repo_path, NULL);
3229 	if (error)
3230 		goto done;
3231 
3232 	error = got_repo_open(&repo, repo_path);
3233 	if (error != NULL)
3234 		goto done;
3235 
3236 	if (worktree) {
3237 		const char *prefix = got_worktree_get_path_prefix(worktree);
3238 		char *p, *worktree_subdir = cwd +
3239 		    strlen(got_worktree_get_root_path(worktree));
3240 		if (asprintf(&p, "%s%s%s%s%s",
3241 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3242 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3243 		    path) == -1) {
3244 			error = got_error_from_errno();
3245 			goto done;
3246 		}
3247 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3248 		free(p);
3249 	} else {
3250 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3251 	}
3252 	if (error)
3253 		goto done;
3254 
3255 	if (commit_id_str == NULL) {
3256 		struct got_reference *head_ref;
3257 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
3258 		if (error != NULL)
3259 			goto done;
3260 		error = got_ref_resolve(&commit_id, repo, head_ref);
3261 		got_ref_close(head_ref);
3262 	} else {
3263 		error = got_object_resolve_id_str(&commit_id, repo,
3264 		    commit_id_str);
3265 	}
3266 	if (error != NULL)
3267 		goto done;
3268 
3269 	SIMPLEQ_INIT(&refs);
3270 	error = got_ref_list(&refs, repo);
3271 	if (error)
3272 		goto done;
3273 
3274 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3275 	if (view == NULL) {
3276 		error = got_error_from_errno();
3277 		goto done;
3278 	}
3279 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3280 	if (error)
3281 		goto done;
3282 	error = view_loop(view);
3283 done:
3284 	free(repo_path);
3285 	free(cwd);
3286 	free(commit_id);
3287 	if (worktree)
3288 		got_worktree_close(worktree);
3289 	if (repo)
3290 		got_repo_close(repo);
3291 	return error;
3292 }
3293 
3294 static const struct got_error *
3295 draw_tree_entries(struct tog_view *view,
3296     struct got_tree_entry **first_displayed_entry,
3297     struct got_tree_entry **last_displayed_entry,
3298     struct got_tree_entry **selected_entry, int *ndisplayed,
3299     const char *label, int show_ids, const char *parent_path,
3300     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3301 {
3302 	const struct got_error *err = NULL;
3303 	struct got_tree_entry *te;
3304 	wchar_t *wline;
3305 	int width, n;
3306 
3307 	*ndisplayed = 0;
3308 
3309 	werase(view->window);
3310 
3311 	if (limit == 0)
3312 		return NULL;
3313 
3314 	err = format_line(&wline, &width, label, view->ncols);
3315 	if (err)
3316 		return err;
3317 	if (view_needs_focus_indication(view))
3318 		wstandout(view->window);
3319 	waddwstr(view->window, wline);
3320 	if (view_needs_focus_indication(view))
3321 		wstandend(view->window);
3322 	free(wline);
3323 	wline = NULL;
3324 	if (width < view->ncols)
3325 		waddch(view->window, '\n');
3326 	if (--limit <= 0)
3327 		return NULL;
3328 	err = format_line(&wline, &width, parent_path, view->ncols);
3329 	if (err)
3330 		return err;
3331 	waddwstr(view->window, wline);
3332 	free(wline);
3333 	wline = NULL;
3334 	if (width < view->ncols)
3335 		waddch(view->window, '\n');
3336 	if (--limit <= 0)
3337 		return NULL;
3338 	waddch(view->window, '\n');
3339 	if (--limit <= 0)
3340 		return NULL;
3341 
3342 	te = SIMPLEQ_FIRST(&entries->head);
3343 	if (*first_displayed_entry == NULL) {
3344 		if (selected == 0) {
3345 			if (view->focussed)
3346 				wstandout(view->window);
3347 			*selected_entry = NULL;
3348 		}
3349 		waddstr(view->window, "  ..\n");	/* parent directory */
3350 		if (selected == 0 && view->focussed)
3351 			wstandend(view->window);
3352 		(*ndisplayed)++;
3353 		if (--limit <= 0)
3354 			return NULL;
3355 		n = 1;
3356 	} else {
3357 		n = 0;
3358 		while (te != *first_displayed_entry)
3359 			te = SIMPLEQ_NEXT(te, entry);
3360 	}
3361 
3362 	while (te) {
3363 		char *line = NULL, *id_str = NULL;
3364 
3365 		if (show_ids) {
3366 			err = got_object_id_str(&id_str, te->id);
3367 			if (err)
3368 				return got_error_from_errno();
3369 		}
3370 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3371 		    te->name, S_ISDIR(te->mode) ? "/" :
3372 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3373 			free(id_str);
3374 			return got_error_from_errno();
3375 		}
3376 		free(id_str);
3377 		err = format_line(&wline, &width, line, view->ncols);
3378 		if (err) {
3379 			free(line);
3380 			break;
3381 		}
3382 		if (n == selected) {
3383 			if (view->focussed)
3384 				wstandout(view->window);
3385 			*selected_entry = te;
3386 		}
3387 		waddwstr(view->window, wline);
3388 		if (width < view->ncols)
3389 			waddch(view->window, '\n');
3390 		if (n == selected && view->focussed)
3391 			wstandend(view->window);
3392 		free(line);
3393 		free(wline);
3394 		wline = NULL;
3395 		n++;
3396 		(*ndisplayed)++;
3397 		*last_displayed_entry = te;
3398 		if (--limit <= 0)
3399 			break;
3400 		te = SIMPLEQ_NEXT(te, entry);
3401 	}
3402 
3403 	return err;
3404 }
3405 
3406 static void
3407 tree_scroll_up(struct tog_view *view,
3408     struct got_tree_entry **first_displayed_entry, int maxscroll,
3409     const struct got_tree_entries *entries, int isroot)
3410 {
3411 	struct got_tree_entry *te, *prev;
3412 	int i;
3413 
3414 	if (*first_displayed_entry == NULL) {
3415 		view_flash(view);
3416 		return;
3417 	}
3418 
3419 	te = SIMPLEQ_FIRST(&entries->head);
3420 	if (*first_displayed_entry == te) {
3421 		view_flash(view);
3422 		if (!isroot)
3423 			*first_displayed_entry = NULL;
3424 		return;
3425 	}
3426 
3427 	/* XXX this is stupid... switch to TAILQ? */
3428 	for (i = 0; i < maxscroll; i++) {
3429 		while (te != *first_displayed_entry) {
3430 			prev = te;
3431 			te = SIMPLEQ_NEXT(te, entry);
3432 		}
3433 		*first_displayed_entry = prev;
3434 		te = SIMPLEQ_FIRST(&entries->head);
3435 	}
3436 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3437 		*first_displayed_entry = NULL;
3438 }
3439 
3440 static int
3441 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3442 	struct got_tree_entry *last_displayed_entry,
3443 	const struct got_tree_entries *entries)
3444 {
3445 	struct got_tree_entry *next, *last;
3446 	int n = 0;
3447 
3448 	if (*first_displayed_entry)
3449 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3450 	else
3451 		next = SIMPLEQ_FIRST(&entries->head);
3452 	last = last_displayed_entry;
3453 	while (next && last && n++ < maxscroll) {
3454 		last = SIMPLEQ_NEXT(last, entry);
3455 		if (last) {
3456 			*first_displayed_entry = next;
3457 			next = SIMPLEQ_NEXT(next, entry);
3458 		}
3459 	}
3460 	return n;
3461 }
3462 
3463 static const struct got_error *
3464 tree_entry_path(char **path, struct tog_parent_trees *parents,
3465     struct got_tree_entry *te)
3466 {
3467 	const struct got_error *err = NULL;
3468 	struct tog_parent_tree *pt;
3469 	size_t len = 2; /* for leading slash and NUL */
3470 
3471 	TAILQ_FOREACH(pt, parents, entry)
3472 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3473 	if (te)
3474 		len += strlen(te->name);
3475 
3476 	*path = calloc(1, len);
3477 	if (path == NULL)
3478 		return got_error_from_errno();
3479 
3480 	(*path)[0] = '/';
3481 	pt = TAILQ_LAST(parents, tog_parent_trees);
3482 	while (pt) {
3483 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3484 			err = got_error(GOT_ERR_NO_SPACE);
3485 			goto done;
3486 		}
3487 		if (strlcat(*path, "/", len) >= len) {
3488 			err = got_error(GOT_ERR_NO_SPACE);
3489 			goto done;
3490 		}
3491 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3492 	}
3493 	if (te) {
3494 		if (strlcat(*path, te->name, len) >= len) {
3495 			err = got_error(GOT_ERR_NO_SPACE);
3496 			goto done;
3497 		}
3498 	}
3499 done:
3500 	if (err) {
3501 		free(*path);
3502 		*path = NULL;
3503 	}
3504 	return err;
3505 }
3506 
3507 static const struct got_error *
3508 blame_tree_entry(struct tog_view **new_view, int begin_x,
3509     struct got_tree_entry *te, struct tog_parent_trees *parents,
3510     struct got_object_id *commit_id, struct got_reflist_head *refs,
3511     struct got_repository *repo)
3512 {
3513 	const struct got_error *err = NULL;
3514 	char *path;
3515 	struct tog_view *blame_view;
3516 
3517 	err = tree_entry_path(&path, parents, te);
3518 	if (err)
3519 		return err;
3520 
3521 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3522 	if (blame_view == NULL)
3523 		return got_error_from_errno();
3524 
3525 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3526 	if (err) {
3527 		view_close(blame_view);
3528 		free(path);
3529 	} else
3530 		*new_view = blame_view;
3531 	return err;
3532 }
3533 
3534 static const struct got_error *
3535 log_tree_entry(struct tog_view **new_view, int begin_x,
3536     struct got_tree_entry *te, struct tog_parent_trees *parents,
3537     struct got_object_id *commit_id, struct got_reflist_head *refs,
3538     struct got_repository *repo)
3539 {
3540 	struct tog_view *log_view;
3541 	const struct got_error *err = NULL;
3542 	char *path;
3543 
3544 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3545 	if (log_view == NULL)
3546 		return got_error_from_errno();
3547 
3548 	err = tree_entry_path(&path, parents, te);
3549 	if (err)
3550 		return err;
3551 
3552 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3553 	if (err)
3554 		view_close(log_view);
3555 	else
3556 		*new_view = log_view;
3557 	free(path);
3558 	return err;
3559 }
3560 
3561 static const struct got_error *
3562 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3563     struct got_object_id *commit_id, struct got_reflist_head *refs,
3564     struct got_repository *repo)
3565 {
3566 	const struct got_error *err = NULL;
3567 	char *commit_id_str = NULL;
3568 	struct tog_tree_view_state *s = &view->state.tree;
3569 
3570 	TAILQ_INIT(&s->parents);
3571 
3572 	err = got_object_id_str(&commit_id_str, commit_id);
3573 	if (err != NULL)
3574 		goto done;
3575 
3576 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3577 		err = got_error_from_errno();
3578 		goto done;
3579 	}
3580 
3581 	s->root = s->tree = root;
3582 	s->entries = got_object_tree_get_entries(root);
3583 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3584 	s->commit_id = got_object_id_dup(commit_id);
3585 	if (s->commit_id == NULL) {
3586 		err = got_error_from_errno();
3587 		goto done;
3588 	}
3589 	s->refs = refs;
3590 	s->repo = repo;
3591 
3592 	view->show = show_tree_view;
3593 	view->input = input_tree_view;
3594 	view->close = close_tree_view;
3595 done:
3596 	free(commit_id_str);
3597 	if (err) {
3598 		free(s->tree_label);
3599 		s->tree_label = NULL;
3600 	}
3601 	return err;
3602 }
3603 
3604 static const struct got_error *
3605 close_tree_view(struct tog_view *view)
3606 {
3607 	struct tog_tree_view_state *s = &view->state.tree;
3608 
3609 	free(s->tree_label);
3610 	s->tree_label = NULL;
3611 	free(s->commit_id);
3612 	s->commit_id = NULL;
3613 	while (!TAILQ_EMPTY(&s->parents)) {
3614 		struct tog_parent_tree *parent;
3615 		parent = TAILQ_FIRST(&s->parents);
3616 		TAILQ_REMOVE(&s->parents, parent, entry);
3617 		free(parent);
3618 
3619 	}
3620 	if (s->tree != s->root)
3621 		got_object_tree_close(s->tree);
3622 	got_object_tree_close(s->root);
3623 
3624 	return NULL;
3625 }
3626 
3627 static const struct got_error *
3628 show_tree_view(struct tog_view *view)
3629 {
3630 	const struct got_error *err = NULL;
3631 	struct tog_tree_view_state *s = &view->state.tree;
3632 	char *parent_path;
3633 
3634 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3635 	if (err)
3636 		return err;
3637 
3638 	err = draw_tree_entries(view, &s->first_displayed_entry,
3639 	    &s->last_displayed_entry, &s->selected_entry,
3640 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3641 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3642 	free(parent_path);
3643 
3644 	view_vborder(view);
3645 	return err;
3646 }
3647 
3648 static const struct got_error *
3649 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3650     struct tog_view **focus_view, struct tog_view *view, int ch)
3651 {
3652 	const struct got_error *err = NULL;
3653 	struct tog_tree_view_state *s = &view->state.tree;
3654 	struct tog_view *log_view;
3655 	int begin_x = 0, nscrolled;
3656 
3657 	switch (ch) {
3658 		case 'i':
3659 			s->show_ids = !s->show_ids;
3660 			break;
3661 		case 'l':
3662 			if (!s->selected_entry)
3663 				break;
3664 			if (view_is_parent_view(view))
3665 				begin_x = view_split_begin_x(view->begin_x);
3666 			err = log_tree_entry(&log_view, begin_x,
3667 			    s->selected_entry, &s->parents,
3668 			    s->commit_id, s->refs, s->repo);
3669 			if (view_is_parent_view(view)) {
3670 				err = view_close_child(view);
3671 				if (err)
3672 					return err;
3673 				err = view_set_child(view, log_view);
3674 				if (err) {
3675 					view_close(log_view);
3676 					break;
3677 				}
3678 				*focus_view = log_view;
3679 				view->child_focussed = 1;
3680 			} else
3681 				*new_view = log_view;
3682 			break;
3683 		case 'k':
3684 		case KEY_UP:
3685 			if (s->selected > 0) {
3686 				s->selected--;
3687 				if (s->selected == 0)
3688 					break;
3689 			}
3690 			if (s->selected > 0)
3691 				break;
3692 			tree_scroll_up(view, &s->first_displayed_entry, 1,
3693 			    s->entries, s->tree == s->root);
3694 			break;
3695 		case KEY_PPAGE:
3696 			tree_scroll_up(view, &s->first_displayed_entry,
3697 			    MAX(0, view->nlines - 4 - s->selected), s->entries,
3698 			    s->tree == s->root);
3699 			s->selected = 0;
3700 			if (SIMPLEQ_FIRST(&s->entries->head) ==
3701 			    s->first_displayed_entry && s->tree != s->root)
3702 				s->first_displayed_entry = NULL;
3703 			break;
3704 		case 'j':
3705 		case KEY_DOWN:
3706 			if (s->selected < s->ndisplayed - 1) {
3707 				s->selected++;
3708 				break;
3709 			}
3710 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3711 			    == NULL) {
3712 				/* can't scroll any further */
3713 				view_flash(view);
3714 				break;
3715 			}
3716 			tree_scroll_down(&s->first_displayed_entry, 1,
3717 			    s->last_displayed_entry, s->entries);
3718 			break;
3719 		case KEY_NPAGE:
3720 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3721 			    == NULL) {
3722 				/* can't scroll any further; move cursor down */
3723 				if (s->selected < s->ndisplayed - 1)
3724 					s->selected = s->ndisplayed - 1;
3725 				else
3726 					view_flash(view);
3727 				break;
3728 			}
3729 			nscrolled = tree_scroll_down(&s->first_displayed_entry,
3730 			    view->nlines, s->last_displayed_entry, s->entries);
3731 			if (nscrolled < view->nlines) {
3732 				int ndisplayed = 0;
3733 				struct got_tree_entry *te;
3734 				te = s->first_displayed_entry;
3735 				do {
3736 					ndisplayed++;
3737 					te = SIMPLEQ_NEXT(te, entry);
3738 				} while (te);
3739 				s->selected = ndisplayed - 1;
3740 			}
3741 			break;
3742 		case KEY_ENTER:
3743 		case '\r':
3744 			if (s->selected_entry == NULL) {
3745 				struct tog_parent_tree *parent;
3746 		case KEY_BACKSPACE:
3747 				/* user selected '..' */
3748 				if (s->tree == s->root)
3749 					break;
3750 				parent = TAILQ_FIRST(&s->parents);
3751 				TAILQ_REMOVE(&s->parents, parent,
3752 				    entry);
3753 				got_object_tree_close(s->tree);
3754 				s->tree = parent->tree;
3755 				s->entries =
3756 				    got_object_tree_get_entries(s->tree);
3757 				s->first_displayed_entry =
3758 				    parent->first_displayed_entry;
3759 				s->selected_entry =
3760 				    parent->selected_entry;
3761 				s->selected = parent->selected;
3762 				free(parent);
3763 			} else if (S_ISDIR(s->selected_entry->mode)) {
3764 				struct tog_parent_tree *parent;
3765 				struct got_tree_object *child;
3766 				err = got_object_open_as_tree(&child,
3767 				    s->repo, s->selected_entry->id);
3768 				if (err)
3769 					break;
3770 				parent = calloc(1, sizeof(*parent));
3771 				if (parent == NULL) {
3772 					err = got_error_from_errno();
3773 					break;
3774 				}
3775 				parent->tree = s->tree;
3776 				parent->first_displayed_entry =
3777 				   s->first_displayed_entry;
3778 				parent->selected_entry = s->selected_entry;
3779 				parent->selected = s->selected;
3780 				TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3781 				s->tree = child;
3782 				s->entries =
3783 				    got_object_tree_get_entries(s->tree);
3784 				s->selected = 0;
3785 				s->first_displayed_entry = NULL;
3786 			} else if (S_ISREG(s->selected_entry->mode)) {
3787 				struct tog_view *blame_view;
3788 				int begin_x = view_is_parent_view(view) ?
3789 				    view_split_begin_x(view->begin_x) : 0;
3790 
3791 				err = blame_tree_entry(&blame_view, begin_x,
3792 				    s->selected_entry, &s->parents,
3793 				    s->commit_id, s->refs, s->repo);
3794 				if (err)
3795 					break;
3796 				if (view_is_parent_view(view)) {
3797 					err = view_close_child(view);
3798 					if (err)
3799 						return err;
3800 					err = view_set_child(view, blame_view);
3801 					if (err) {
3802 						view_close(blame_view);
3803 						break;
3804 					}
3805 					*focus_view = blame_view;
3806 					view->child_focussed = 1;
3807 				} else
3808 					*new_view = blame_view;
3809 			}
3810 			break;
3811 		case KEY_RESIZE:
3812 			if (s->selected > view->nlines)
3813 				s->selected = s->ndisplayed - 1;
3814 			break;
3815 		default:
3816 			break;
3817 	}
3818 
3819 	return err;
3820 }
3821 
3822 __dead static void
3823 usage_tree(void)
3824 {
3825 	endwin();
3826 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3827 	    getprogname());
3828 	exit(1);
3829 }
3830 
3831 static const struct got_error *
3832 cmd_tree(int argc, char *argv[])
3833 {
3834 	const struct got_error *error;
3835 	struct got_repository *repo = NULL;
3836 	struct got_reflist_head refs;
3837 	char *repo_path = NULL;
3838 	struct got_object_id *commit_id = NULL;
3839 	char *commit_id_arg = NULL;
3840 	struct got_commit_object *commit = NULL;
3841 	struct got_tree_object *tree = NULL;
3842 	int ch;
3843 	struct tog_view *view;
3844 
3845 #ifndef PROFILE
3846 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3847 	    NULL) == -1)
3848 		err(1, "pledge");
3849 #endif
3850 
3851 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3852 		switch (ch) {
3853 		case 'c':
3854 			commit_id_arg = optarg;
3855 			break;
3856 		default:
3857 			usage_tree();
3858 			/* NOTREACHED */
3859 		}
3860 	}
3861 
3862 	argc -= optind;
3863 	argv += optind;
3864 
3865 	if (argc == 0) {
3866 		struct got_worktree *worktree;
3867 		char *cwd = getcwd(NULL, 0);
3868 		if (cwd == NULL)
3869 			return got_error_from_errno();
3870 		error = got_worktree_open(&worktree, cwd);
3871 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3872 			goto done;
3873 		if (worktree) {
3874 			free(cwd);
3875 			repo_path =
3876 			    strdup(got_worktree_get_repo_path(worktree));
3877 			got_worktree_close(worktree);
3878 		} else
3879 			repo_path = cwd;
3880 		if (repo_path == NULL) {
3881 			error = got_error_from_errno();
3882 			goto done;
3883 		}
3884 	} else if (argc == 1) {
3885 		repo_path = realpath(argv[0], NULL);
3886 		if (repo_path == NULL)
3887 			return got_error_from_errno();
3888 	} else
3889 		usage_log();
3890 
3891 	init_curses();
3892 
3893 	error = apply_unveil(repo_path, NULL);
3894 	if (error)
3895 		goto done;
3896 
3897 	error = got_repo_open(&repo, repo_path);
3898 	if (error != NULL)
3899 		goto done;
3900 
3901 	if (commit_id_arg == NULL)
3902 		error = get_head_commit_id(&commit_id, repo);
3903 	else
3904 		error = got_object_resolve_id_str(&commit_id, repo,
3905 		    commit_id_arg);
3906 	if (error != NULL)
3907 		goto done;
3908 
3909 	error = got_object_open_as_commit(&commit, repo, commit_id);
3910 	if (error != NULL)
3911 		goto done;
3912 
3913 	error = got_object_open_as_tree(&tree, repo,
3914 	    got_object_commit_get_tree_id(commit));
3915 	if (error != NULL)
3916 		goto done;
3917 
3918 	SIMPLEQ_INIT(&refs);
3919 	error = got_ref_list(&refs, repo);
3920 	if (error)
3921 		goto done;
3922 
3923 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3924 	if (view == NULL) {
3925 		error = got_error_from_errno();
3926 		goto done;
3927 	}
3928 	error = open_tree_view(view, tree, commit_id, &refs, repo);
3929 	if (error)
3930 		goto done;
3931 	error = view_loop(view);
3932 done:
3933 	free(repo_path);
3934 	free(commit_id);
3935 	if (commit)
3936 		got_object_commit_close(commit);
3937 	if (tree)
3938 		got_object_tree_close(tree);
3939 	if (repo)
3940 		got_repo_close(repo);
3941 	return error;
3942 }
3943 
3944 __dead static void
3945 usage(void)
3946 {
3947 	int i;
3948 
3949 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3950 	    "Available commands:\n", getprogname());
3951 	for (i = 0; i < nitems(tog_commands); i++) {
3952 		struct tog_cmd *cmd = &tog_commands[i];
3953 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3954 	}
3955 	exit(1);
3956 }
3957 
3958 static char **
3959 make_argv(const char *arg0, const char *arg1)
3960 {
3961 	char **argv;
3962 	int argc = (arg1 == NULL ? 1 : 2);
3963 
3964 	argv = calloc(argc, sizeof(char *));
3965 	if (argv == NULL)
3966 		err(1, "calloc");
3967 	argv[0] = strdup(arg0);
3968 	if (argv[0] == NULL)
3969 		err(1, "calloc");
3970 	if (arg1) {
3971 		argv[1] = strdup(arg1);
3972 		if (argv[1] == NULL)
3973 			err(1, "calloc");
3974 	}
3975 
3976 	return argv;
3977 }
3978 
3979 int
3980 main(int argc, char *argv[])
3981 {
3982 	const struct got_error *error = NULL;
3983 	struct tog_cmd *cmd = NULL;
3984 	int ch, hflag = 0;
3985 	char **cmd_argv = NULL;
3986 
3987 	setlocale(LC_CTYPE, "");
3988 
3989 	while ((ch = getopt(argc, argv, "h")) != -1) {
3990 		switch (ch) {
3991 		case 'h':
3992 			hflag = 1;
3993 			break;
3994 		default:
3995 			usage();
3996 			/* NOTREACHED */
3997 		}
3998 	}
3999 
4000 	argc -= optind;
4001 	argv += optind;
4002 	optind = 0;
4003 	optreset = 1;
4004 
4005 	if (argc == 0) {
4006 		if (hflag)
4007 			usage();
4008 		/* Build an argument vector which runs a default command. */
4009 		cmd = &tog_commands[0];
4010 		cmd_argv = make_argv(cmd->name, NULL);
4011 		argc = 1;
4012 	} else {
4013 		int i;
4014 
4015 		/* Did the user specific a command? */
4016 		for (i = 0; i < nitems(tog_commands); i++) {
4017 			if (strncmp(tog_commands[i].name, argv[0],
4018 			    strlen(argv[0])) == 0) {
4019 				cmd = &tog_commands[i];
4020 				if (hflag)
4021 					tog_commands[i].cmd_usage();
4022 				break;
4023 			}
4024 		}
4025 		if (cmd == NULL) {
4026 			/* Did the user specify a repository? */
4027 			char *repo_path = realpath(argv[0], NULL);
4028 			if (repo_path) {
4029 				struct got_repository *repo;
4030 				error = got_repo_open(&repo, repo_path);
4031 				if (error == NULL)
4032 					got_repo_close(repo);
4033 			} else
4034 				error = got_error_from_errno();
4035 			if (error) {
4036 				if (hflag) {
4037 					fprintf(stderr, "%s: '%s' is not a "
4038 					    "known command\n", getprogname(),
4039 					    argv[0]);
4040 					usage();
4041 				}
4042 				fprintf(stderr, "%s: '%s' is neither a known "
4043 				    "command nor a path to a repository\n",
4044 				    getprogname(), argv[0]);
4045 				free(repo_path);
4046 				return 1;
4047 			}
4048 			cmd = &tog_commands[0];
4049 			cmd_argv = make_argv(cmd->name, repo_path);
4050 			argc = 2;
4051 			free(repo_path);
4052 		}
4053 	}
4054 
4055 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4056 	if (error)
4057 		goto done;
4058 done:
4059 	endwin();
4060 	free(cmd_argv);
4061 	if (error)
4062 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4063 	return 0;
4064 }