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, "got/", 4) == 0)
906 			continue;
907 		if (strncmp(name, "heads/", 6) == 0)
908 			name += 6;
909 		if (strncmp(name, "remotes/", 8) == 0)
910 			name += 8;
911 		s = *refs_str;
912 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
913 		    s ? ", " : "", name) == -1) {
914 			err = got_error_from_errno();
915 			free(s);
916 			*refs_str = NULL;
917 			break;
918 		}
919 		free(s);
920 	}
921 
922 	return err;
923 }
924 
925 static const struct got_error *
926 format_author(wchar_t **wauthor, int *author_width, char *author, int limit)
927 {
928 	char *smallerthan, *at;
929 
930 	smallerthan = strchr(author, '<');
931 	if (smallerthan && smallerthan[1] != '\0')
932 		author = smallerthan + 1;
933 	at = strchr(author, '@');
934 	if (at)
935 		*at = '\0';
936 	return format_line(wauthor, author_width, author, limit);
937 }
938 
939 static const struct got_error *
940 draw_commit(struct tog_view *view, struct got_commit_object *commit,
941     struct got_object_id *id, struct got_reflist_head *refs,
942     int author_display_cols)
943 {
944 	const struct got_error *err = NULL;
945 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
946 	char *logmsg0 = NULL, *logmsg = NULL;
947 	char *author = NULL;
948 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
949 	int author_width, logmsg_width;
950 	char *newline, *line = NULL;
951 	int col, limit;
952 	static const size_t date_display_cols = 9;
953 	const int avail = view->ncols;
954 	struct tm tm;
955 	time_t committer_time;
956 
957 	committer_time = got_object_commit_get_committer_time(commit);
958 	if (localtime_r(&committer_time, &tm) == NULL)
959 		return got_error_from_errno();
960 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
961 	    >= sizeof(datebuf))
962 		return got_error(GOT_ERR_NO_SPACE);
963 
964 	if (avail < date_display_cols)
965 		limit = MIN(sizeof(datebuf) - 1, avail);
966 	else
967 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
968 	waddnstr(view->window, datebuf, limit);
969 	col = limit + 1;
970 	if (col > avail)
971 		goto done;
972 
973 	author = strdup(got_object_commit_get_author(commit));
974 	if (author == NULL) {
975 		err = got_error_from_errno();
976 		goto done;
977 	}
978 	err = format_author(&wauthor, &author_width, author, avail - col);
979 	if (err)
980 		goto done;
981 	waddwstr(view->window, wauthor);
982 	col += author_width;
983 	while (col <= avail && author_width < author_display_cols + 2) {
984 		waddch(view->window, ' ');
985 		col++;
986 		author_width++;
987 	}
988 	if (col > avail)
989 		goto done;
990 
991 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
992 	if (logmsg0 == NULL) {
993 		err = got_error_from_errno();
994 		goto done;
995 	}
996 	logmsg = logmsg0;
997 	while (*logmsg == '\n')
998 		logmsg++;
999 	newline = strchr(logmsg, '\n');
1000 	if (newline)
1001 		*newline = '\0';
1002 	limit = avail - col;
1003 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
1004 	if (err)
1005 		goto done;
1006 	waddwstr(view->window, wlogmsg);
1007 	col += logmsg_width;
1008 	while (col <= avail) {
1009 		waddch(view->window, ' ');
1010 		col++;
1011 	}
1012 done:
1013 	free(logmsg0);
1014 	free(wlogmsg);
1015 	free(author);
1016 	free(wauthor);
1017 	free(line);
1018 	return err;
1019 }
1020 
1021 static struct commit_queue_entry *
1022 alloc_commit_queue_entry(struct got_commit_object *commit,
1023     struct got_object_id *id)
1024 {
1025 	struct commit_queue_entry *entry;
1026 
1027 	entry = calloc(1, sizeof(*entry));
1028 	if (entry == NULL)
1029 		return NULL;
1030 
1031 	entry->id = id;
1032 	entry->commit = commit;
1033 	return entry;
1034 }
1035 
1036 static void
1037 pop_commit(struct commit_queue *commits)
1038 {
1039 	struct commit_queue_entry *entry;
1040 
1041 	entry = TAILQ_FIRST(&commits->head);
1042 	TAILQ_REMOVE(&commits->head, entry, entry);
1043 	got_object_commit_close(entry->commit);
1044 	commits->ncommits--;
1045 	/* Don't free entry->id! It is owned by the commit graph. */
1046 	free(entry);
1047 }
1048 
1049 static void
1050 free_commits(struct commit_queue *commits)
1051 {
1052 	while (!TAILQ_EMPTY(&commits->head))
1053 		pop_commit(commits);
1054 }
1055 
1056 static const struct got_error *
1057 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
1058     int minqueue, struct got_repository *repo, const char *path)
1059 {
1060 	const struct got_error *err = NULL;
1061 	int nqueued = 0;
1062 
1063 	/*
1064 	 * We keep all commits open throughout the lifetime of the log
1065 	 * view in order to avoid having to re-fetch commits from disk
1066 	 * while updating the display.
1067 	 */
1068 	while (nqueued < minqueue) {
1069 		struct got_object_id *id;
1070 		struct got_commit_object *commit;
1071 		struct commit_queue_entry *entry;
1072 		int errcode;
1073 
1074 		err = got_commit_graph_iter_next(&id, graph);
1075 		if (err) {
1076 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1077 				break;
1078 			err = got_commit_graph_fetch_commits(graph,
1079 			    minqueue, repo);
1080 			if (err)
1081 				return err;
1082 			continue;
1083 		}
1084 
1085 		if (id == NULL)
1086 			break;
1087 
1088 		err = got_object_open_as_commit(&commit, repo, id);
1089 		if (err)
1090 			break;
1091 		entry = alloc_commit_queue_entry(commit, id);
1092 		if (entry == NULL) {
1093 			err = got_error_from_errno();
1094 			break;
1095 		}
1096 
1097 		errcode = pthread_mutex_lock(&tog_mutex);
1098 		if (errcode) {
1099 			err = got_error_set_errno(errcode);
1100 			break;
1101 		}
1102 
1103 		entry->idx = commits->ncommits;
1104 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1105 		nqueued++;
1106 		commits->ncommits++;
1107 
1108 		errcode = pthread_mutex_unlock(&tog_mutex);
1109 		if (errcode && err == NULL)
1110 			err = got_error_set_errno(errcode);
1111 	}
1112 
1113 	return err;
1114 }
1115 
1116 static const struct got_error *
1117 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
1118 {
1119 	const struct got_error *err = NULL;
1120 	struct got_reference *head_ref;
1121 
1122 	*head_id = NULL;
1123 
1124 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1125 	if (err)
1126 		return err;
1127 
1128 	err = got_ref_resolve(head_id, repo, head_ref);
1129 	got_ref_close(head_ref);
1130 	if (err) {
1131 		*head_id = NULL;
1132 		return err;
1133 	}
1134 
1135 	return NULL;
1136 }
1137 
1138 static const struct got_error *
1139 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1140     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1141     struct commit_queue *commits, int selected_idx, int limit,
1142     struct got_reflist_head *refs, const char *path, int commits_needed)
1143 {
1144 	const struct got_error *err = NULL;
1145 	struct commit_queue_entry *entry;
1146 	int ncommits, width;
1147 	int author_cols = 10;
1148 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1149 	char *refs_str = NULL;
1150 	wchar_t *wline;
1151 
1152 	entry = first;
1153 	ncommits = 0;
1154 	while (entry) {
1155 		if (ncommits == selected_idx) {
1156 			*selected = entry;
1157 			break;
1158 		}
1159 		entry = TAILQ_NEXT(entry, entry);
1160 		ncommits++;
1161 	}
1162 
1163 	if (*selected) {
1164 		err = got_object_id_str(&id_str, (*selected)->id);
1165 		if (err)
1166 			return err;
1167 		if (refs) {
1168 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1169 			if (err)
1170 				goto done;
1171 		}
1172 	}
1173 
1174 	if (commits_needed == 0)
1175 		halfdelay(10); /* disable fast refresh */
1176 
1177 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1178 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1179 	    commits_needed > 0 ? "loading... " :
1180 	    (refs_str ? refs_str : "")) == -1) {
1181 		err = got_error_from_errno();
1182 		goto done;
1183 	}
1184 
1185 	if (path && strcmp(path, "/") != 0) {
1186 		if (asprintf(&header, "commit %s %s%s",
1187 		    id_str ? id_str : "........................................",
1188 		    path, ncommits_str) == -1) {
1189 			err = got_error_from_errno();
1190 			header = NULL;
1191 			goto done;
1192 		}
1193 	} else if (asprintf(&header, "commit %s%s",
1194 	    id_str ? id_str : "........................................",
1195 	    ncommits_str) == -1) {
1196 		err = got_error_from_errno();
1197 		header = NULL;
1198 		goto done;
1199 	}
1200 	err = format_line(&wline, &width, header, view->ncols);
1201 	if (err)
1202 		goto done;
1203 
1204 	werase(view->window);
1205 
1206 	if (view_needs_focus_indication(view))
1207 		wstandout(view->window);
1208 	waddwstr(view->window, wline);
1209 	while (width < view->ncols) {
1210 		waddch(view->window, ' ');
1211 		width++;
1212 	}
1213 	if (view_needs_focus_indication(view))
1214 		wstandend(view->window);
1215 	free(wline);
1216 	if (limit <= 1)
1217 		goto done;
1218 
1219 	/* Grow author column size if necessary. */
1220 	entry = first;
1221 	ncommits = 0;
1222 	while (entry) {
1223 		char *author;
1224 		wchar_t *wauthor;
1225 		int width;
1226 		if (ncommits >= limit - 1)
1227 			break;
1228 		author = strdup(got_object_commit_get_author(entry->commit));
1229 		if (author == NULL) {
1230 			err = got_error_from_errno();
1231 			goto done;
1232 		}
1233 		err = format_author(&wauthor, &width, author, COLS);
1234 		if (author_cols < width)
1235 			author_cols = width;
1236 		free(wauthor);
1237 		free(author);
1238 		entry = TAILQ_NEXT(entry, entry);
1239 	}
1240 
1241 	entry = first;
1242 	*last = first;
1243 	ncommits = 0;
1244 	while (entry) {
1245 		if (ncommits >= limit - 1)
1246 			break;
1247 		if (ncommits == selected_idx)
1248 			wstandout(view->window);
1249 		err = draw_commit(view, entry->commit, entry->id, refs,
1250 		    author_cols);
1251 		if (ncommits == selected_idx)
1252 			wstandend(view->window);
1253 		if (err)
1254 			break;
1255 		ncommits++;
1256 		*last = entry;
1257 		entry = TAILQ_NEXT(entry, entry);
1258 	}
1259 
1260 	view_vborder(view);
1261 done:
1262 	free(id_str);
1263 	free(refs_str);
1264 	free(ncommits_str);
1265 	free(header);
1266 	return err;
1267 }
1268 
1269 static void
1270 scroll_up(struct tog_view *view,
1271     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1272     struct commit_queue *commits)
1273 {
1274 	struct commit_queue_entry *entry;
1275 	int nscrolled = 0;
1276 
1277 	entry = TAILQ_FIRST(&commits->head);
1278 	if (*first_displayed_entry == entry) {
1279 		view_flash(view);
1280 		return;
1281 	}
1282 
1283 	entry = *first_displayed_entry;
1284 	while (entry && nscrolled < maxscroll) {
1285 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1286 		if (entry) {
1287 			*first_displayed_entry = entry;
1288 			nscrolled++;
1289 		}
1290 	}
1291 }
1292 
1293 static const struct got_error *
1294 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1295     pthread_cond_t *need_commits)
1296 {
1297 	int errcode;
1298 	int max_wait = 20;
1299 
1300 	halfdelay(1); /* fast refresh while loading commits */
1301 
1302 	while (*commits_needed > 0) {
1303 		if (*log_complete)
1304 			break;
1305 
1306 		/* Wake the log thread. */
1307 		errcode = pthread_cond_signal(need_commits);
1308 		if (errcode)
1309 			return got_error_set_errno(errcode);
1310 		errcode = pthread_mutex_unlock(&tog_mutex);
1311 		if (errcode)
1312 			return got_error_set_errno(errcode);
1313 		pthread_yield();
1314 		errcode = pthread_mutex_lock(&tog_mutex);
1315 		if (errcode)
1316 			return got_error_set_errno(errcode);
1317 
1318 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1319 			/*
1320 			 * Thread is not done yet; lose a key press
1321 			 * and let the user retry... this way the GUI
1322 			 * remains interactive while logging deep paths
1323 			 * with few commits in history.
1324 			 */
1325 			return NULL;
1326 		}
1327 	}
1328 
1329 	return NULL;
1330 }
1331 
1332 static const struct got_error *
1333 scroll_down(struct tog_view *view,
1334     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1335     struct commit_queue_entry **last_displayed_entry,
1336     struct commit_queue *commits, int *log_complete, int *commits_needed,
1337     pthread_cond_t *need_commits)
1338 {
1339 	const struct got_error *err = NULL;
1340 	struct commit_queue_entry *pentry;
1341 	int nscrolled = 0;
1342 
1343 	if (*last_displayed_entry == NULL)
1344 		return NULL;
1345 
1346 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1347 	if (pentry == NULL && !*log_complete) {
1348 		/*
1349 		 * Ask the log thread for required amount of commits
1350 		 * plus some amount of pre-fetching.
1351 		 */
1352 		(*commits_needed) += maxscroll + 20;
1353 		err = trigger_log_thread(0, commits_needed, log_complete,
1354 		    need_commits);
1355 		if (err)
1356 			return err;
1357 	}
1358 
1359 	do {
1360 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1361 		if (pentry == NULL) {
1362 			if (*log_complete)
1363 				view_flash(view);
1364 			break;
1365 		}
1366 
1367 		*last_displayed_entry = pentry;
1368 
1369 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1370 		if (pentry == NULL)
1371 			break;
1372 		*first_displayed_entry = pentry;
1373 	} while (++nscrolled < maxscroll);
1374 
1375 	return err;
1376 }
1377 
1378 static const struct got_error *
1379 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1380     struct got_commit_object *commit, struct got_object_id *commit_id,
1381     struct tog_view *log_view, struct got_reflist_head *refs,
1382     struct got_repository *repo)
1383 {
1384 	const struct got_error *err;
1385 	struct got_object_qid *parent_id;
1386 	struct tog_view *diff_view;
1387 
1388 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1389 	if (diff_view == NULL)
1390 		return got_error_from_errno();
1391 
1392 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1393 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1394 	    commit_id, log_view, refs, repo);
1395 	if (err == NULL)
1396 		*new_view = diff_view;
1397 	return err;
1398 }
1399 
1400 static const struct got_error *
1401 browse_commit(struct tog_view **new_view, int begin_x,
1402     struct commit_queue_entry *entry, struct got_reflist_head *refs,
1403     struct got_repository *repo)
1404 {
1405 	const struct got_error *err = NULL;
1406 	struct got_tree_object *tree;
1407 	struct tog_view *tree_view;
1408 
1409 	err = got_object_open_as_tree(&tree, repo,
1410 	    got_object_commit_get_tree_id(entry->commit));
1411 	if (err)
1412 		return err;
1413 
1414 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1415 	if (tree_view == NULL)
1416 		return got_error_from_errno();
1417 
1418 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1419 	if (err)
1420 		got_object_tree_close(tree);
1421 	else
1422 		*new_view = tree_view;
1423 	return err;
1424 }
1425 
1426 static void *
1427 log_thread(void *arg)
1428 {
1429 	const struct got_error *err = NULL;
1430 	int errcode = 0;
1431 	struct tog_log_thread_args *a = arg;
1432 	int done = 0;
1433 
1434 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1435 	if (err)
1436 		return (void *)err;
1437 
1438 	while (!done && !err) {
1439 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1440 		    a->in_repo_path);
1441 		if (err) {
1442 			if (err->code != GOT_ERR_ITER_COMPLETED)
1443 				return (void *)err;
1444 			err = NULL;
1445 			done = 1;
1446 		} else if (a->commits_needed > 0)
1447 			a->commits_needed--;
1448 
1449 		errcode = pthread_mutex_lock(&tog_mutex);
1450 		if (errcode)
1451 			return (void *)got_error_set_errno(errcode);
1452 
1453 		if (done)
1454 			a->log_complete = 1;
1455 		else if (*a->quit) {
1456 			done = 1;
1457 			a->log_complete = 1;
1458 		} else if (*a->first_displayed_entry == NULL) {
1459 			*a->first_displayed_entry =
1460 			    TAILQ_FIRST(&a->commits->head);
1461 			*a->selected_entry = *a->first_displayed_entry;
1462 		}
1463 
1464 		if (done)
1465 			a->commits_needed = 0;
1466 		else if (a->commits_needed == 0) {
1467 			errcode = pthread_cond_wait(&a->need_commits,
1468 			    &tog_mutex);
1469 			if (errcode)
1470 				err = got_error_set_errno(errcode);
1471 		}
1472 
1473 		errcode = pthread_mutex_unlock(&tog_mutex);
1474 		if (errcode && err == NULL)
1475 			err = got_error_set_errno(errcode);
1476 	}
1477 	return (void *)err;
1478 }
1479 
1480 static const struct got_error *
1481 stop_log_thread(struct tog_log_view_state *s)
1482 {
1483 	const struct got_error *err = NULL;
1484 	int errcode;
1485 
1486 	if (s->thread) {
1487 		s->quit = 1;
1488 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1489 		if (errcode)
1490 			return got_error_set_errno(errcode);
1491 		errcode = pthread_mutex_unlock(&tog_mutex);
1492 		if (errcode)
1493 			return got_error_set_errno(errcode);
1494 		errcode = pthread_join(s->thread, (void **)&err);
1495 		if (errcode)
1496 			return got_error_set_errno(errcode);
1497 		errcode = pthread_mutex_lock(&tog_mutex);
1498 		if (errcode)
1499 			return got_error_set_errno(errcode);
1500 		s->thread = NULL;
1501 	}
1502 
1503 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1504 	if (errcode && err == NULL)
1505 		err = got_error_set_errno(errcode);
1506 
1507 	if (s->thread_args.repo) {
1508 		got_repo_close(s->thread_args.repo);
1509 		s->thread_args.repo = NULL;
1510 	}
1511 
1512 	if (s->thread_args.graph) {
1513 		got_commit_graph_close(s->thread_args.graph);
1514 		s->thread_args.graph = NULL;
1515 	}
1516 
1517 	return err;
1518 }
1519 
1520 static const struct got_error *
1521 close_log_view(struct tog_view *view)
1522 {
1523 	const struct got_error *err = NULL;
1524 	struct tog_log_view_state *s = &view->state.log;
1525 
1526 	err = stop_log_thread(s);
1527 	free_commits(&s->commits);
1528 	free(s->in_repo_path);
1529 	s->in_repo_path = NULL;
1530 	free(s->start_id);
1531 	s->start_id = NULL;
1532 	return err;
1533 }
1534 
1535 static const struct got_error *
1536 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1537     struct got_reflist_head *refs, struct got_repository *repo,
1538     const char *path, int check_disk)
1539 {
1540 	const struct got_error *err = NULL;
1541 	struct tog_log_view_state *s = &view->state.log;
1542 	struct got_repository *thread_repo = NULL;
1543 	struct got_commit_graph *thread_graph = NULL;
1544 	int errcode;
1545 
1546 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1547 	if (err != NULL)
1548 		goto done;
1549 
1550 	/* The commit queue only contains commits being displayed. */
1551 	TAILQ_INIT(&s->commits.head);
1552 	s->commits.ncommits = 0;
1553 
1554 	s->refs = refs;
1555 	s->repo = repo;
1556 	s->start_id = got_object_id_dup(start_id);
1557 	if (s->start_id == NULL) {
1558 		err = got_error_from_errno();
1559 		goto done;
1560 	}
1561 
1562 	view->show = show_log_view;
1563 	view->input = input_log_view;
1564 	view->close = close_log_view;
1565 
1566 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1567 	if (err)
1568 		goto done;
1569 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1570 	    0, thread_repo);
1571 	if (err)
1572 		goto done;
1573 
1574 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1575 	if (errcode) {
1576 		err = got_error_set_errno(errcode);
1577 		goto done;
1578 	}
1579 
1580 	s->thread_args.commits_needed = view->nlines;
1581 	s->thread_args.graph = thread_graph;
1582 	s->thread_args.commits = &s->commits;
1583 	s->thread_args.in_repo_path = s->in_repo_path;
1584 	s->thread_args.start_id = s->start_id;
1585 	s->thread_args.repo = thread_repo;
1586 	s->thread_args.log_complete = 0;
1587 	s->thread_args.quit = &s->quit;
1588 	s->thread_args.view = view;
1589 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1590 	s->thread_args.selected_entry = &s->selected_entry;
1591 done:
1592 	if (err)
1593 		close_log_view(view);
1594 	return err;
1595 }
1596 
1597 static const struct got_error *
1598 show_log_view(struct tog_view *view)
1599 {
1600 	struct tog_log_view_state *s = &view->state.log;
1601 
1602 	if (s->thread == NULL) {
1603 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1604 		    &s->thread_args);
1605 		if (errcode)
1606 			return got_error_set_errno(errcode);
1607 	}
1608 
1609 	return draw_commits(view, &s->last_displayed_entry,
1610 	    &s->selected_entry, s->first_displayed_entry,
1611 	    &s->commits, s->selected, view->nlines, s->refs,
1612 	    s->in_repo_path, s->thread_args.commits_needed);
1613 }
1614 
1615 static const struct got_error *
1616 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1617     struct tog_view **focus_view, struct tog_view *view, int ch)
1618 {
1619 	const struct got_error *err = NULL;
1620 	struct tog_log_view_state *s = &view->state.log;
1621 	char *parent_path;
1622 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1623 	int begin_x = 0;
1624 
1625 	switch (ch) {
1626 		case 'q':
1627 			s->quit = 1;
1628 			break;
1629 		case 'k':
1630 		case KEY_UP:
1631 		case '<':
1632 		case ',':
1633 			if (s->first_displayed_entry == NULL)
1634 				break;
1635 			if (s->selected > 0)
1636 				s->selected--;
1637 			if (s->selected > 0)
1638 				break;
1639 			scroll_up(view, &s->first_displayed_entry, 1,
1640 			    &s->commits);
1641 			break;
1642 		case KEY_PPAGE:
1643 			if (s->first_displayed_entry == NULL)
1644 				break;
1645 			if (TAILQ_FIRST(&s->commits.head) ==
1646 			    s->first_displayed_entry) {
1647 				if (s->selected == 0) {
1648 					view_flash(view);
1649 					break;
1650 				}
1651 				s->selected = 0;
1652 				break;
1653 			}
1654 			scroll_up(view, &s->first_displayed_entry,
1655 			    view->nlines, &s->commits);
1656 			break;
1657 		case 'j':
1658 		case KEY_DOWN:
1659 		case '>':
1660 		case '.':
1661 			if (s->first_displayed_entry == NULL)
1662 				break;
1663 			if (s->selected < MIN(view->nlines - 2,
1664 			    s->commits.ncommits - 1)) {
1665 				s->selected++;
1666 				break;
1667 			}
1668 			err = scroll_down(view, &s->first_displayed_entry, 1,
1669 			    &s->last_displayed_entry, &s->commits,
1670 			    &s->thread_args.log_complete,
1671 			    &s->thread_args.commits_needed,
1672 			    &s->thread_args.need_commits);
1673 			break;
1674 		case KEY_NPAGE: {
1675 			struct commit_queue_entry *first;
1676 			first = s->first_displayed_entry;
1677 			if (first == NULL)
1678 				break;
1679 			err = scroll_down(view, &s->first_displayed_entry,
1680 			    view->nlines, &s->last_displayed_entry,
1681 			    &s->commits, &s->thread_args.log_complete,
1682 			    &s->thread_args.commits_needed,
1683 			    &s->thread_args.need_commits);
1684 			if (first == s->first_displayed_entry &&
1685 			    s->selected < MIN(view->nlines - 2,
1686 			    s->commits.ncommits - 1)) {
1687 				/* can't scroll further down */
1688 				s->selected = MIN(view->nlines - 2,
1689 				    s->commits.ncommits - 1);
1690 			}
1691 			err = NULL;
1692 			break;
1693 		}
1694 		case KEY_RESIZE:
1695 			if (s->selected > view->nlines - 2)
1696 				s->selected = view->nlines - 2;
1697 			if (s->selected > s->commits.ncommits - 1)
1698 				s->selected = s->commits.ncommits - 1;
1699 			break;
1700 		case KEY_ENTER:
1701 		case '\r':
1702 			if (s->selected_entry == NULL)
1703 				break;
1704 			if (view_is_parent_view(view))
1705 				begin_x = view_split_begin_x(view->begin_x);
1706 			err = open_diff_view_for_commit(&diff_view, begin_x,
1707 			    s->selected_entry->commit, s->selected_entry->id,
1708 			    view, s->refs, s->repo);
1709 			if (err)
1710 				break;
1711 			if (view_is_parent_view(view)) {
1712 				err = view_close_child(view);
1713 				if (err)
1714 					return err;
1715 				err = view_set_child(view, diff_view);
1716 				if (err) {
1717 					view_close(diff_view);
1718 					break;
1719 				}
1720 				*focus_view = diff_view;
1721 				view->child_focussed = 1;
1722 			} else
1723 				*new_view = diff_view;
1724 			break;
1725 		case 't':
1726 			if (s->selected_entry == NULL)
1727 				break;
1728 			if (view_is_parent_view(view))
1729 				begin_x = view_split_begin_x(view->begin_x);
1730 			err = browse_commit(&tree_view, begin_x,
1731 			    s->selected_entry, s->refs, s->repo);
1732 			if (err)
1733 				break;
1734 			if (view_is_parent_view(view)) {
1735 				err = view_close_child(view);
1736 				if (err)
1737 					return err;
1738 				err = view_set_child(view, tree_view);
1739 				if (err) {
1740 					view_close(tree_view);
1741 					break;
1742 				}
1743 				*focus_view = tree_view;
1744 				view->child_focussed = 1;
1745 			} else
1746 				*new_view = tree_view;
1747 			break;
1748 		case KEY_BACKSPACE:
1749 			if (strcmp(s->in_repo_path, "/") == 0)
1750 				break;
1751 			parent_path = dirname(s->in_repo_path);
1752 			if (parent_path && strcmp(parent_path, ".") != 0) {
1753 				struct tog_view *lv;
1754 				err = stop_log_thread(s);
1755 				if (err)
1756 					return err;
1757 				lv = view_open(view->nlines, view->ncols,
1758 				    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1759 				if (lv == NULL)
1760 					return got_error_from_errno();
1761 				err = open_log_view(lv, s->start_id, s->refs,
1762 				    s->repo, parent_path, 0);
1763 				if (err)
1764 					return err;;
1765 				if (view_is_parent_view(view))
1766 					*new_view = lv;
1767 				else {
1768 					view_set_child(view->parent, lv);
1769 					*focus_view = lv;
1770 				}
1771 				return NULL;
1772 			}
1773 			break;
1774 		default:
1775 			break;
1776 	}
1777 
1778 	return err;
1779 }
1780 
1781 static const struct got_error *
1782 apply_unveil(const char *repo_path, const char *worktree_path)
1783 {
1784 	const struct got_error *error;
1785 
1786 	if (repo_path && unveil(repo_path, "r") != 0)
1787 		return got_error_from_errno();
1788 
1789 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1790 		return got_error_from_errno();
1791 
1792 	if (unveil("/tmp", "rwc") != 0)
1793 		return got_error_from_errno();
1794 
1795 	error = got_privsep_unveil_exec_helpers();
1796 	if (error != NULL)
1797 		return error;
1798 
1799 	if (unveil(NULL, NULL) != 0)
1800 		return got_error_from_errno();
1801 
1802 	return NULL;
1803 }
1804 
1805 static void
1806 init_curses(void)
1807 {
1808 	initscr();
1809 	cbreak();
1810 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1811 	noecho();
1812 	nonl();
1813 	intrflush(stdscr, FALSE);
1814 	keypad(stdscr, TRUE);
1815 	curs_set(0);
1816 	signal(SIGWINCH, tog_sigwinch);
1817 }
1818 
1819 static const struct got_error *
1820 cmd_log(int argc, char *argv[])
1821 {
1822 	const struct got_error *error;
1823 	struct got_repository *repo = NULL;
1824 	struct got_worktree *worktree = NULL;
1825 	struct got_reflist_head refs;
1826 	struct got_object_id *start_id = NULL;
1827 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1828 	char *start_commit = NULL;
1829 	int ch;
1830 	struct tog_view *view;
1831 
1832 #ifndef PROFILE
1833 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1834 	    NULL) == -1)
1835 		err(1, "pledge");
1836 #endif
1837 
1838 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1839 		switch (ch) {
1840 		case 'c':
1841 			start_commit = optarg;
1842 			break;
1843 		case 'r':
1844 			repo_path = realpath(optarg, NULL);
1845 			if (repo_path == NULL)
1846 				err(1, "-r option");
1847 			break;
1848 		default:
1849 			usage_log();
1850 			/* NOTREACHED */
1851 		}
1852 	}
1853 
1854 	argc -= optind;
1855 	argv += optind;
1856 
1857 	if (argc == 0)
1858 		path = strdup("");
1859 	else if (argc == 1)
1860 		path = strdup(argv[0]);
1861 	else
1862 		usage_log();
1863 	if (path == NULL)
1864 		return got_error_from_errno();
1865 
1866 	cwd = getcwd(NULL, 0);
1867 	if (cwd == NULL) {
1868 		error = got_error_from_errno();
1869 		goto done;
1870 	}
1871 	if (repo_path == NULL) {
1872 		error = got_worktree_open(&worktree, cwd);
1873 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
1874 			goto done;
1875 		if (worktree) {
1876 			repo_path =
1877 			    strdup(got_worktree_get_repo_path(worktree));
1878 		} else
1879 			repo_path = strdup(cwd);
1880 		if (repo_path == NULL) {
1881 			error = got_error_from_errno();
1882 			goto done;
1883 		}
1884 	}
1885 
1886 	init_curses();
1887 
1888 	error = apply_unveil(repo_path,
1889 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1890 	if (error)
1891 		goto done;
1892 
1893 	error = got_repo_open(&repo, repo_path);
1894 	if (error != NULL)
1895 		goto done;
1896 
1897 	if (start_commit == NULL)
1898 		error = get_head_commit_id(&start_id, repo);
1899 	else
1900 		error = got_object_resolve_id_str(&start_id, repo,
1901 		    start_commit);
1902 	if (error != NULL)
1903 		goto done;
1904 
1905 	SIMPLEQ_INIT(&refs);
1906 	error = got_ref_list(&refs, repo);
1907 	if (error)
1908 		goto done;
1909 
1910 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1911 	if (view == NULL) {
1912 		error = got_error_from_errno();
1913 		goto done;
1914 	}
1915 	error = open_log_view(view, start_id, &refs, repo, path, 1);
1916 	if (error)
1917 		goto done;
1918 	error = view_loop(view);
1919 done:
1920 	free(repo_path);
1921 	free(cwd);
1922 	free(path);
1923 	free(start_id);
1924 	if (repo)
1925 		got_repo_close(repo);
1926 	if (worktree)
1927 		got_worktree_close(worktree);
1928 	got_ref_list_free(&refs);
1929 	return error;
1930 }
1931 
1932 __dead static void
1933 usage_diff(void)
1934 {
1935 	endwin();
1936 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1937 	    getprogname());
1938 	exit(1);
1939 }
1940 
1941 static char *
1942 parse_next_line(FILE *f, size_t *len)
1943 {
1944 	char *line;
1945 	size_t linelen;
1946 	size_t lineno;
1947 	const char delim[3] = { '\0', '\0', '\0'};
1948 
1949 	line = fparseln(f, &linelen, &lineno, delim, 0);
1950 	if (len)
1951 		*len = linelen;
1952 	return line;
1953 }
1954 
1955 static const struct got_error *
1956 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1957     int *last_displayed_line, int *eof, int max_lines,
1958     char * header)
1959 {
1960 	const struct got_error *err;
1961 	int nlines = 0, nprinted = 0;
1962 	char *line;
1963 	size_t len;
1964 	wchar_t *wline;
1965 	int width;
1966 
1967 	rewind(f);
1968 	werase(view->window);
1969 
1970 	if (header) {
1971 		err = format_line(&wline, &width, header, view->ncols);
1972 		if (err) {
1973 			return err;
1974 		}
1975 
1976 		if (view_needs_focus_indication(view))
1977 			wstandout(view->window);
1978 		waddwstr(view->window, wline);
1979 		if (view_needs_focus_indication(view))
1980 			wstandend(view->window);
1981 		if (width < view->ncols)
1982 			waddch(view->window, '\n');
1983 
1984 		if (max_lines <= 1)
1985 			return NULL;
1986 		max_lines--;
1987 	}
1988 
1989 	*eof = 0;
1990 	while (nprinted < max_lines) {
1991 		line = parse_next_line(f, &len);
1992 		if (line == NULL) {
1993 			*eof = 1;
1994 			break;
1995 		}
1996 		if (++nlines < *first_displayed_line) {
1997 			free(line);
1998 			continue;
1999 		}
2000 
2001 		err = format_line(&wline, &width, line, view->ncols);
2002 		if (err) {
2003 			free(line);
2004 			return err;
2005 		}
2006 		waddwstr(view->window, wline);
2007 		if (width < view->ncols)
2008 			waddch(view->window, '\n');
2009 		if (++nprinted == 1)
2010 			*first_displayed_line = nlines;
2011 		free(line);
2012 		free(wline);
2013 		wline = NULL;
2014 	}
2015 	*last_displayed_line = nlines;
2016 
2017 	view_vborder(view);
2018 
2019 	return NULL;
2020 }
2021 
2022 static char *
2023 get_datestr(time_t *time, char *datebuf)
2024 {
2025 	char *p, *s = ctime_r(time, datebuf);
2026 	p = strchr(s, '\n');
2027 	if (p)
2028 		*p = '\0';
2029 	return s;
2030 }
2031 
2032 static const struct got_error *
2033 write_commit_info(struct got_object_id *commit_id,
2034     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2035 {
2036 	const struct got_error *err = NULL;
2037 	char datebuf[26];
2038 	struct got_commit_object *commit;
2039 	char *id_str = NULL;
2040 	time_t committer_time;
2041 	const char *author, *committer;
2042 	char *refs_str = NULL;
2043 
2044 	if (refs) {
2045 		err = build_refs_str(&refs_str, refs, commit_id);
2046 		if (err)
2047 			return err;
2048 	}
2049 
2050 	err = got_object_open_as_commit(&commit, repo, commit_id);
2051 	if (err)
2052 		return err;
2053 
2054 	err = got_object_id_str(&id_str, commit_id);
2055 	if (err) {
2056 		err = got_error_from_errno();
2057 		goto done;
2058 	}
2059 
2060 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2061 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2062 		err = got_error_from_errno();
2063 		goto done;
2064 	}
2065 	if (fprintf(outfile, "from: %s\n",
2066 	    got_object_commit_get_author(commit)) < 0) {
2067 		err = got_error_from_errno();
2068 		goto done;
2069 	}
2070 	committer_time = got_object_commit_get_committer_time(commit);
2071 	if (fprintf(outfile, "date: %s UTC\n",
2072 	    get_datestr(&committer_time, datebuf)) < 0) {
2073 		err = got_error_from_errno();
2074 		goto done;
2075 	}
2076 	author = got_object_commit_get_author(commit);
2077 	committer = got_object_commit_get_committer(commit);
2078 	if (strcmp(author, committer) != 0 &&
2079 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2080 		err = got_error_from_errno();
2081 		goto done;
2082 	}
2083 	if (fprintf(outfile, "%s\n",
2084 	    got_object_commit_get_logmsg(commit)) < 0) {
2085 		err = got_error_from_errno();
2086 		goto done;
2087 	}
2088 done:
2089 	free(id_str);
2090 	free(refs_str);
2091 	got_object_commit_close(commit);
2092 	return err;
2093 }
2094 
2095 static const struct got_error *
2096 create_diff(struct tog_diff_view_state *s)
2097 {
2098 	const struct got_error *err = NULL;
2099 	FILE *f = NULL;
2100 	int obj_type;
2101 
2102 	f = got_opentemp();
2103 	if (f == NULL) {
2104 		err = got_error_from_errno();
2105 		goto done;
2106 	}
2107 	if (s->f && fclose(s->f) != 0) {
2108 		err = got_error_from_errno();
2109 		goto done;
2110 	}
2111 	s->f = f;
2112 
2113 	if (s->id1)
2114 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2115 	else
2116 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2117 	if (err)
2118 		goto done;
2119 
2120 	switch (obj_type) {
2121 	case GOT_OBJ_TYPE_BLOB:
2122 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2123 		    s->diff_context, s->repo, f);
2124 		break;
2125 	case GOT_OBJ_TYPE_TREE:
2126 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2127 		    s->diff_context, s->repo, f);
2128 		break;
2129 	case GOT_OBJ_TYPE_COMMIT: {
2130 		const struct got_object_id_queue *parent_ids;
2131 		struct got_object_qid *pid;
2132 		struct got_commit_object *commit2;
2133 
2134 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2135 		if (err)
2136 			break;
2137 		/* Show commit info if we're diffing to a parent/root commit. */
2138 		if (s->id1 == NULL)
2139 			write_commit_info(s->id2, s->refs, s->repo, f);
2140 		else {
2141 			parent_ids = got_object_commit_get_parent_ids(commit2);
2142 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2143 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2144 					write_commit_info(s->id2, s->refs,
2145 					    s->repo, f);
2146 					break;
2147 				}
2148 			}
2149 		}
2150 		got_object_commit_close(commit2);
2151 
2152 		err = got_diff_objects_as_commits(s->id1, s->id2,
2153 		    s->diff_context, s->repo, f);
2154 		break;
2155 	}
2156 	default:
2157 		err = got_error(GOT_ERR_OBJ_TYPE);
2158 		break;
2159 	}
2160 done:
2161 	if (f && fflush(f) != 0 && err == NULL)
2162 		err = got_error_from_errno();
2163 	return err;
2164 }
2165 
2166 static void
2167 diff_view_indicate_progress(struct tog_view *view)
2168 {
2169 	werase(view->window);
2170 	waddstr(view->window, "diffing...");
2171 	update_panels();
2172 	doupdate();
2173 }
2174 
2175 static const struct got_error *
2176 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2177     struct got_object_id *id2, struct tog_view *log_view,
2178     struct got_reflist_head *refs, struct got_repository *repo)
2179 {
2180 	const struct got_error *err;
2181 
2182 	if (id1 != NULL && id2 != NULL) {
2183 	    int type1, type2;
2184 	    err = got_object_get_type(&type1, repo, id1);
2185 	    if (err)
2186 		return err;
2187 	    err = got_object_get_type(&type2, repo, id2);
2188 	    if (err)
2189 		return err;
2190 
2191 	    if (type1 != type2)
2192 		return got_error(GOT_ERR_OBJ_TYPE);
2193 	}
2194 
2195 	if (id1) {
2196 		view->state.diff.id1 = got_object_id_dup(id1);
2197 		if (view->state.diff.id1 == NULL)
2198 			return got_error_from_errno();
2199 	} else
2200 		view->state.diff.id1 = NULL;
2201 
2202 	view->state.diff.id2 = got_object_id_dup(id2);
2203 	if (view->state.diff.id2 == NULL) {
2204 		free(view->state.diff.id1);
2205 		view->state.diff.id1 = NULL;
2206 		return got_error_from_errno();
2207 	}
2208 	view->state.diff.f = NULL;
2209 	view->state.diff.first_displayed_line = 1;
2210 	view->state.diff.last_displayed_line = view->nlines;
2211 	view->state.diff.diff_context = 3;
2212 	view->state.diff.log_view = log_view;
2213 	view->state.diff.repo = repo;
2214 	view->state.diff.refs = refs;
2215 
2216 	if (log_view && view_is_splitscreen(view))
2217 		show_log_view(log_view); /* draw vborder */
2218 	diff_view_indicate_progress(view);
2219 
2220 	err = create_diff(&view->state.diff);
2221 	if (err) {
2222 		free(view->state.diff.id1);
2223 		view->state.diff.id1 = NULL;
2224 		free(view->state.diff.id2);
2225 		view->state.diff.id2 = NULL;
2226 		return err;
2227 	}
2228 
2229 	view->show = show_diff_view;
2230 	view->input = input_diff_view;
2231 	view->close = close_diff_view;
2232 
2233 	return NULL;
2234 }
2235 
2236 static const struct got_error *
2237 close_diff_view(struct tog_view *view)
2238 {
2239 	const struct got_error *err = NULL;
2240 
2241 	free(view->state.diff.id1);
2242 	view->state.diff.id1 = NULL;
2243 	free(view->state.diff.id2);
2244 	view->state.diff.id2 = NULL;
2245 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2246 		err = got_error_from_errno();
2247 	return err;
2248 }
2249 
2250 static const struct got_error *
2251 show_diff_view(struct tog_view *view)
2252 {
2253 	const struct got_error *err;
2254 	struct tog_diff_view_state *s = &view->state.diff;
2255 	char *id_str1 = NULL, *id_str2, *header;
2256 
2257 	if (s->id1) {
2258 		err = got_object_id_str(&id_str1, s->id1);
2259 		if (err)
2260 			return err;
2261 	}
2262 	err = got_object_id_str(&id_str2, s->id2);
2263 	if (err)
2264 		return err;
2265 
2266 	if (asprintf(&header, "diff %s %s",
2267 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2268 		err = got_error_from_errno();
2269 		free(id_str1);
2270 		free(id_str2);
2271 		return err;
2272 	}
2273 	free(id_str1);
2274 	free(id_str2);
2275 
2276 	return draw_file(view, s->f, &s->first_displayed_line,
2277 	    &s->last_displayed_line, &s->eof, view->nlines,
2278 	    header);
2279 }
2280 
2281 static const struct got_error *
2282 set_selected_commit(struct tog_diff_view_state *s,
2283     struct commit_queue_entry *entry)
2284 {
2285 	const struct got_error *err;
2286 	const struct got_object_id_queue *parent_ids;
2287 	struct got_commit_object *selected_commit;
2288 	struct got_object_qid *pid;
2289 
2290 	free(s->id2);
2291 	s->id2 = got_object_id_dup(entry->id);
2292 	if (s->id2 == NULL)
2293 		return got_error_from_errno();
2294 
2295 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2296 	if (err)
2297 		return err;
2298 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2299 	free(s->id1);
2300 	pid = SIMPLEQ_FIRST(parent_ids);
2301 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2302 	got_object_commit_close(selected_commit);
2303 	return NULL;
2304 }
2305 
2306 static const struct got_error *
2307 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2308     struct tog_view **focus_view, struct tog_view *view, int ch)
2309 {
2310 	const struct got_error *err = NULL;
2311 	struct tog_diff_view_state *s = &view->state.diff;
2312 	struct tog_log_view_state *ls;
2313 	struct commit_queue_entry *entry;
2314 	int i;
2315 
2316 	switch (ch) {
2317 		case 'k':
2318 		case KEY_UP:
2319 			if (s->first_displayed_line > 1)
2320 				s->first_displayed_line--;
2321 			else
2322 				view_flash(view);
2323 			break;
2324 		case KEY_PPAGE:
2325 			if (s->first_displayed_line == 1) {
2326 				view_flash(view);
2327 				break;
2328 			}
2329 			i = 0;
2330 			while (i++ < view->nlines - 1 &&
2331 			    s->first_displayed_line > 1)
2332 				s->first_displayed_line--;
2333 			break;
2334 		case 'j':
2335 		case KEY_DOWN:
2336 			if (!s->eof)
2337 				s->first_displayed_line++;
2338 			else
2339 				view_flash(view);
2340 			break;
2341 		case KEY_NPAGE:
2342 		case ' ':
2343 			if (s->eof) {
2344 				view_flash(view);
2345 				break;
2346 			}
2347 			i = 0;
2348 			while (!s->eof && i++ < view->nlines - 1) {
2349 				char *line;
2350 				line = parse_next_line(s->f, NULL);
2351 				s->first_displayed_line++;
2352 				if (line == NULL)
2353 					break;
2354 			}
2355 			break;
2356 		case '[':
2357 			if (s->diff_context > 0) {
2358 				s->diff_context--;
2359 				diff_view_indicate_progress(view);
2360 				err = create_diff(s);
2361 			}
2362 			break;
2363 		case ']':
2364 			if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2365 				s->diff_context++;
2366 				diff_view_indicate_progress(view);
2367 				err = create_diff(s);
2368 			}
2369 			break;
2370 		case '<':
2371 		case ',':
2372 			if (s->log_view == NULL)
2373 				break;
2374 			ls = &s->log_view->state.log;
2375 			entry = TAILQ_PREV(ls->selected_entry,
2376 			    commit_queue_head, entry);
2377 			if (entry == NULL)
2378 				break;
2379 
2380 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2381 			    KEY_UP);
2382 			if (err)
2383 				break;
2384 
2385 			err = set_selected_commit(s, entry);
2386 			if (err)
2387 				break;
2388 
2389 			s->first_displayed_line = 1;
2390 			s->last_displayed_line = view->nlines;
2391 
2392 			diff_view_indicate_progress(view);
2393 			err = create_diff(s);
2394 			break;
2395 		case '>':
2396 		case '.':
2397 			if (s->log_view == NULL)
2398 				break;
2399 			ls = &s->log_view->state.log;
2400 
2401 			if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2402 				ls->thread_args.commits_needed++;
2403 
2404 				/* Display "loading..." in log view. */
2405 				show_log_view(s->log_view);
2406 				update_panels();
2407 				doupdate();
2408 
2409 				err = trigger_log_thread(1 /* load_all */,
2410 				    &ls->thread_args.commits_needed,
2411 				    &ls->thread_args.log_complete,
2412 				    &ls->thread_args.need_commits);
2413 				if (err)
2414 					break;
2415 			}
2416 			err = input_log_view(NULL, NULL, NULL, s->log_view,
2417 			    KEY_DOWN);
2418 			if (err)
2419 				break;
2420 
2421 			entry = TAILQ_NEXT(ls->selected_entry, entry);
2422 			if (entry == NULL)
2423 				break;
2424 
2425 			err = set_selected_commit(s, entry);
2426 			if (err)
2427 				break;
2428 
2429 			s->first_displayed_line = 1;
2430 			s->last_displayed_line = view->nlines;
2431 
2432 			diff_view_indicate_progress(view);
2433 			err = create_diff(s);
2434 			break;
2435 		default:
2436 			break;
2437 	}
2438 
2439 	return err;
2440 }
2441 
2442 static const struct got_error *
2443 cmd_diff(int argc, char *argv[])
2444 {
2445 	const struct got_error *error = NULL;
2446 	struct got_repository *repo = NULL;
2447 	struct got_reflist_head refs;
2448 	struct got_object_id *id1 = NULL, *id2 = NULL;
2449 	char *repo_path = NULL;
2450 	char *id_str1 = NULL, *id_str2 = NULL;
2451 	int ch;
2452 	struct tog_view *view;
2453 
2454 #ifndef PROFILE
2455 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2456 	    NULL) == -1)
2457 		err(1, "pledge");
2458 #endif
2459 
2460 	while ((ch = getopt(argc, argv, "")) != -1) {
2461 		switch (ch) {
2462 		default:
2463 			usage_diff();
2464 			/* NOTREACHED */
2465 		}
2466 	}
2467 
2468 	argc -= optind;
2469 	argv += optind;
2470 
2471 	if (argc == 0) {
2472 		usage_diff(); /* TODO show local worktree changes */
2473 	} else if (argc == 2) {
2474 		repo_path = getcwd(NULL, 0);
2475 		if (repo_path == NULL)
2476 			return got_error_from_errno();
2477 		id_str1 = argv[0];
2478 		id_str2 = argv[1];
2479 	} else if (argc == 3) {
2480 		repo_path = realpath(argv[0], NULL);
2481 		if (repo_path == NULL)
2482 			return got_error_from_errno();
2483 		id_str1 = argv[1];
2484 		id_str2 = argv[2];
2485 	} else
2486 		usage_diff();
2487 
2488 	init_curses();
2489 
2490 	error = apply_unveil(repo_path, NULL);
2491 	if (error)
2492 		goto done;
2493 
2494 	error = got_repo_open(&repo, repo_path);
2495 	free(repo_path);
2496 	if (error)
2497 		goto done;
2498 
2499 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2500 	if (error)
2501 		goto done;
2502 
2503 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2504 	if (error)
2505 		goto done;
2506 
2507 	SIMPLEQ_INIT(&refs);
2508 	error = got_ref_list(&refs, repo);
2509 	if (error)
2510 		goto done;
2511 
2512 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2513 	if (view == NULL) {
2514 		error = got_error_from_errno();
2515 		goto done;
2516 	}
2517 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2518 	if (error)
2519 		goto done;
2520 	error = view_loop(view);
2521 done:
2522 	got_repo_close(repo);
2523 	got_ref_list_free(&refs);
2524 	return error;
2525 }
2526 
2527 __dead static void
2528 usage_blame(void)
2529 {
2530 	endwin();
2531 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2532 	    getprogname());
2533 	exit(1);
2534 }
2535 
2536 struct tog_blame_line {
2537 	int annotated;
2538 	struct got_object_id *id;
2539 };
2540 
2541 static const struct got_error *
2542 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2543     const char *path, struct tog_blame_line *lines, int nlines,
2544     int blame_complete, int selected_line, int *first_displayed_line,
2545     int *last_displayed_line, int *eof, int max_lines)
2546 {
2547 	const struct got_error *err;
2548 	int lineno = 0, nprinted = 0;
2549 	char *line;
2550 	size_t len;
2551 	wchar_t *wline;
2552 	int width, wlimit;
2553 	struct tog_blame_line *blame_line;
2554 	struct got_object_id *prev_id = NULL;
2555 	char *id_str;
2556 
2557 	err = got_object_id_str(&id_str, id);
2558 	if (err)
2559 		return err;
2560 
2561 	rewind(f);
2562 	werase(view->window);
2563 
2564 	if (asprintf(&line, "commit %s", id_str) == -1) {
2565 		err = got_error_from_errno();
2566 		free(id_str);
2567 		return err;
2568 	}
2569 
2570 	err = format_line(&wline, &width, line, view->ncols);
2571 	free(line);
2572 	line = NULL;
2573 	if (view_needs_focus_indication(view))
2574 		wstandout(view->window);
2575 	waddwstr(view->window, wline);
2576 	if (view_needs_focus_indication(view))
2577 		wstandend(view->window);
2578 	free(wline);
2579 	wline = NULL;
2580 	if (width < view->ncols)
2581 		waddch(view->window, '\n');
2582 
2583 	if (asprintf(&line, "[%d/%d] %s%s",
2584 	    *first_displayed_line - 1 + selected_line, nlines,
2585 	    blame_complete ? "" : "annotating... ", path) == -1) {
2586 		free(id_str);
2587 		return got_error_from_errno();
2588 	}
2589 	free(id_str);
2590 	err = format_line(&wline, &width, line, view->ncols);
2591 	free(line);
2592 	line = NULL;
2593 	if (err)
2594 		return err;
2595 	waddwstr(view->window, wline);
2596 	free(wline);
2597 	wline = NULL;
2598 	if (width < view->ncols)
2599 		waddch(view->window, '\n');
2600 
2601 	*eof = 0;
2602 	while (nprinted < max_lines - 2) {
2603 		line = parse_next_line(f, &len);
2604 		if (line == NULL) {
2605 			*eof = 1;
2606 			break;
2607 		}
2608 		if (++lineno < *first_displayed_line) {
2609 			free(line);
2610 			continue;
2611 		}
2612 
2613 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2614 		err = format_line(&wline, &width, line, wlimit);
2615 		if (err) {
2616 			free(line);
2617 			return err;
2618 		}
2619 
2620 		if (view->focussed && nprinted == selected_line - 1)
2621 			wstandout(view->window);
2622 
2623 		blame_line = &lines[lineno - 1];
2624 		if (blame_line->annotated && prev_id &&
2625 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2626 			waddstr(view->window, "         ");
2627 		else if (blame_line->annotated) {
2628 			char *id_str;
2629 			err = got_object_id_str(&id_str, blame_line->id);
2630 			if (err) {
2631 				free(line);
2632 				free(wline);
2633 				return err;
2634 			}
2635 			wprintw(view->window, "%.8s ", id_str);
2636 			free(id_str);
2637 			prev_id = blame_line->id;
2638 		} else {
2639 			waddstr(view->window, "........ ");
2640 			prev_id = NULL;
2641 		}
2642 
2643 		waddwstr(view->window, wline);
2644 		while (width < wlimit) {
2645 			waddch(view->window, ' ');
2646 			width++;
2647 		}
2648 		if (view->focussed && nprinted == selected_line - 1)
2649 			wstandend(view->window);
2650 		if (++nprinted == 1)
2651 			*first_displayed_line = lineno;
2652 		free(line);
2653 		free(wline);
2654 		wline = NULL;
2655 	}
2656 	*last_displayed_line = lineno;
2657 
2658 	view_vborder(view);
2659 
2660 	return NULL;
2661 }
2662 
2663 static const struct got_error *
2664 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2665 {
2666 	const struct got_error *err = NULL;
2667 	struct tog_blame_cb_args *a = arg;
2668 	struct tog_blame_line *line;
2669 	int errcode;
2670 
2671 	if (nlines != a->nlines ||
2672 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2673 		return got_error(GOT_ERR_RANGE);
2674 
2675 	errcode = pthread_mutex_lock(&tog_mutex);
2676 	if (errcode)
2677 		return got_error_set_errno(errcode);
2678 
2679 	if (*a->quit) {	/* user has quit the blame view */
2680 		err = got_error(GOT_ERR_ITER_COMPLETED);
2681 		goto done;
2682 	}
2683 
2684 	if (lineno == -1)
2685 		goto done; /* no change in this commit */
2686 
2687 	line = &a->lines[lineno - 1];
2688 	if (line->annotated)
2689 		goto done;
2690 
2691 	line->id = got_object_id_dup(id);
2692 	if (line->id == NULL) {
2693 		err = got_error_from_errno();
2694 		goto done;
2695 	}
2696 	line->annotated = 1;
2697 done:
2698 	errcode = pthread_mutex_unlock(&tog_mutex);
2699 	if (errcode)
2700 		err = got_error_set_errno(errcode);
2701 	return err;
2702 }
2703 
2704 static void *
2705 blame_thread(void *arg)
2706 {
2707 	const struct got_error *err;
2708 	struct tog_blame_thread_args *ta = arg;
2709 	struct tog_blame_cb_args *a = ta->cb_args;
2710 	int errcode;
2711 
2712 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2713 	    blame_cb, ta->cb_args);
2714 
2715 	errcode = pthread_mutex_lock(&tog_mutex);
2716 	if (errcode)
2717 		return (void *)got_error_set_errno(errcode);
2718 
2719 	got_repo_close(ta->repo);
2720 	ta->repo = NULL;
2721 	*ta->complete = 1;
2722 
2723 	errcode = pthread_mutex_unlock(&tog_mutex);
2724 	if (errcode && err == NULL)
2725 		err = got_error_set_errno(errcode);
2726 
2727 	return (void *)err;
2728 }
2729 
2730 static struct got_object_id *
2731 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2732     int selected_line)
2733 {
2734 	struct tog_blame_line *line;
2735 
2736 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2737 	if (!line->annotated)
2738 		return NULL;
2739 
2740 	return line->id;
2741 }
2742 
2743 static const struct got_error *
2744 stop_blame(struct tog_blame *blame)
2745 {
2746 	const struct got_error *err = NULL;
2747 	int i;
2748 
2749 	if (blame->thread) {
2750 		int errcode;
2751 		errcode = pthread_mutex_unlock(&tog_mutex);
2752 		if (errcode)
2753 			return got_error_set_errno(errcode);
2754 		errcode = pthread_join(blame->thread, (void **)&err);
2755 		if (errcode)
2756 			return got_error_set_errno(errcode);
2757 		errcode = pthread_mutex_lock(&tog_mutex);
2758 		if (errcode)
2759 			return got_error_set_errno(errcode);
2760 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2761 			err = NULL;
2762 		blame->thread = NULL;
2763 	}
2764 	if (blame->thread_args.repo) {
2765 		got_repo_close(blame->thread_args.repo);
2766 		blame->thread_args.repo = NULL;
2767 	}
2768 	if (blame->f) {
2769 		if (fclose(blame->f) != 0 && err == NULL)
2770 			err = got_error_from_errno();
2771 		blame->f = NULL;
2772 	}
2773 	if (blame->lines) {
2774 		for (i = 0; i < blame->nlines; i++)
2775 			free(blame->lines[i].id);
2776 		free(blame->lines);
2777 		blame->lines = NULL;
2778 	}
2779 	free(blame->cb_args.commit_id);
2780 	blame->cb_args.commit_id = NULL;
2781 
2782 	return err;
2783 }
2784 
2785 static const struct got_error *
2786 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2787     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2788     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2789     struct got_repository *repo)
2790 {
2791 	const struct got_error *err = NULL;
2792 	struct got_blob_object *blob = NULL;
2793 	struct got_repository *thread_repo = NULL;
2794 	struct got_object_id *obj_id = NULL;
2795 	int obj_type;
2796 
2797 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2798 	if (err)
2799 		return err;
2800 	if (obj_id == NULL)
2801 		return got_error(GOT_ERR_NO_OBJ);
2802 
2803 	err = got_object_get_type(&obj_type, repo, obj_id);
2804 	if (err)
2805 		goto done;
2806 
2807 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2808 		err = got_error(GOT_ERR_OBJ_TYPE);
2809 		goto done;
2810 	}
2811 
2812 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2813 	if (err)
2814 		goto done;
2815 	blame->f = got_opentemp();
2816 	if (blame->f == NULL) {
2817 		err = got_error_from_errno();
2818 		goto done;
2819 	}
2820 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2821 	    blame->f, blob);
2822 	if (err)
2823 		goto done;
2824 
2825 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2826 	if (blame->lines == NULL) {
2827 		err = got_error_from_errno();
2828 		goto done;
2829 	}
2830 
2831 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2832 	if (err)
2833 		goto done;
2834 
2835 	blame->cb_args.view = view;
2836 	blame->cb_args.lines = blame->lines;
2837 	blame->cb_args.nlines = blame->nlines;
2838 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2839 	if (blame->cb_args.commit_id == NULL) {
2840 		err = got_error_from_errno();
2841 		goto done;
2842 	}
2843 	blame->cb_args.quit = done;
2844 
2845 	blame->thread_args.path = path;
2846 	blame->thread_args.repo = thread_repo;
2847 	blame->thread_args.cb_args = &blame->cb_args;
2848 	blame->thread_args.complete = blame_complete;
2849 	*blame_complete = 0;
2850 
2851 done:
2852 	if (blob)
2853 		got_object_blob_close(blob);
2854 	free(obj_id);
2855 	if (err)
2856 		stop_blame(blame);
2857 	return err;
2858 }
2859 
2860 static const struct got_error *
2861 open_blame_view(struct tog_view *view, char *path,
2862     struct got_object_id *commit_id, struct got_reflist_head *refs,
2863     struct got_repository *repo)
2864 {
2865 	const struct got_error *err = NULL;
2866 	struct tog_blame_view_state *s = &view->state.blame;
2867 
2868 	SIMPLEQ_INIT(&s->blamed_commits);
2869 
2870 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2871 	if (err)
2872 		return err;
2873 
2874 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2875 	s->first_displayed_line = 1;
2876 	s->last_displayed_line = view->nlines;
2877 	s->selected_line = 1;
2878 	s->blame_complete = 0;
2879 	s->path = path;
2880 	if (s->path == NULL)
2881 		return got_error_from_errno();
2882 	s->repo = repo;
2883 	s->refs = refs;
2884 	s->commit_id = commit_id;
2885 	memset(&s->blame, 0, sizeof(s->blame));
2886 
2887 	view->show = show_blame_view;
2888 	view->input = input_blame_view;
2889 	view->close = close_blame_view;
2890 
2891 	return run_blame(&s->blame, view, &s->blame_complete,
2892 	    &s->first_displayed_line, &s->last_displayed_line,
2893 	    &s->selected_line, &s->done, &s->eof, s->path,
2894 	    s->blamed_commit->id, s->repo);
2895 }
2896 
2897 static const struct got_error *
2898 close_blame_view(struct tog_view *view)
2899 {
2900 	const struct got_error *err = NULL;
2901 	struct tog_blame_view_state *s = &view->state.blame;
2902 
2903 	if (s->blame.thread)
2904 		err = stop_blame(&s->blame);
2905 
2906 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2907 		struct got_object_qid *blamed_commit;
2908 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2909 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2910 		got_object_qid_free(blamed_commit);
2911 	}
2912 
2913 	free(s->path);
2914 
2915 	return err;
2916 }
2917 
2918 static const struct got_error *
2919 show_blame_view(struct tog_view *view)
2920 {
2921 	const struct got_error *err = NULL;
2922 	struct tog_blame_view_state *s = &view->state.blame;
2923 	int errcode;
2924 
2925 	if (s->blame.thread == NULL) {
2926 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2927 		    &s->blame.thread_args);
2928 		if (errcode)
2929 			return got_error_set_errno(errcode);
2930 	}
2931 
2932 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2933 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2934 	    s->selected_line, &s->first_displayed_line,
2935 	    &s->last_displayed_line, &s->eof, view->nlines);
2936 
2937 	view_vborder(view);
2938 	return err;
2939 }
2940 
2941 static const struct got_error *
2942 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2943     struct tog_view **focus_view, struct tog_view *view, int ch)
2944 {
2945 	const struct got_error *err = NULL, *thread_err = NULL;
2946 	struct tog_view *diff_view;
2947 	struct tog_blame_view_state *s = &view->state.blame;
2948 	int begin_x = 0;
2949 
2950 	switch (ch) {
2951 		case 'q':
2952 			s->done = 1;
2953 			break;
2954 		case 'k':
2955 		case KEY_UP:
2956 			if (s->selected_line > 1)
2957 				s->selected_line--;
2958 			else if (s->selected_line == 1 &&
2959 			    s->first_displayed_line > 1)
2960 				s->first_displayed_line--;
2961 			else
2962 				view_flash(view);
2963 			break;
2964 		case KEY_PPAGE:
2965 			if (s->first_displayed_line == 1) {
2966 				if (s->selected_line == 1) {
2967 					view_flash(view);
2968 					break;
2969 				}
2970 				s->selected_line = 1;
2971 				break;
2972 			}
2973 			if (s->first_displayed_line > view->nlines - 2)
2974 				s->first_displayed_line -=
2975 				    (view->nlines - 2);
2976 			else
2977 				s->first_displayed_line = 1;
2978 			break;
2979 		case 'j':
2980 		case KEY_DOWN:
2981 			if (s->selected_line < view->nlines - 2 &&
2982 			    s->first_displayed_line +
2983 			    s->selected_line <= s->blame.nlines)
2984 				s->selected_line++;
2985 			else if (s->last_displayed_line <
2986 			    s->blame.nlines)
2987 				s->first_displayed_line++;
2988 			else
2989 				view_flash(view);
2990 			break;
2991 		case 'b':
2992 		case 'p': {
2993 			struct got_object_id *id = NULL;
2994 			id = get_selected_commit_id(s->blame.lines,
2995 			    s->first_displayed_line, s->selected_line);
2996 			if (id == NULL)
2997 				break;
2998 			if (ch == 'p') {
2999 				struct got_commit_object *commit;
3000 				struct got_object_qid *pid;
3001 				struct got_object_id *blob_id = NULL;
3002 				int obj_type;
3003 				err = got_object_open_as_commit(&commit,
3004 				    s->repo, id);
3005 				if (err)
3006 					break;
3007 				pid = SIMPLEQ_FIRST(
3008 				    got_object_commit_get_parent_ids(commit));
3009 				if (pid == NULL) {
3010 					got_object_commit_close(commit);
3011 					break;
3012 				}
3013 				/* Check if path history ends here. */
3014 				err = got_object_id_by_path(&blob_id, s->repo,
3015 				    pid->id, s->path);
3016 				if (err) {
3017 					if (err->code == GOT_ERR_NO_TREE_ENTRY)
3018 						err = NULL;
3019 					got_object_commit_close(commit);
3020 					break;
3021 				}
3022 				err = got_object_get_type(&obj_type, s->repo,
3023 				    blob_id);
3024 				free(blob_id);
3025 				/* Can't blame non-blob type objects. */
3026 				if (obj_type != GOT_OBJ_TYPE_BLOB) {
3027 					got_object_commit_close(commit);
3028 					break;
3029 				}
3030 				err = got_object_qid_alloc(&s->blamed_commit,
3031 				    pid->id);
3032 				got_object_commit_close(commit);
3033 			} else {
3034 				if (got_object_id_cmp(id,
3035 				    s->blamed_commit->id) == 0)
3036 					break;
3037 				err = got_object_qid_alloc(&s->blamed_commit,
3038 				    id);
3039 			}
3040 			if (err)
3041 				break;
3042 			s->done = 1;
3043 			thread_err = stop_blame(&s->blame);
3044 			s->done = 0;
3045 			if (thread_err)
3046 				break;
3047 			SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3048 			    s->blamed_commit, entry);
3049 			err = run_blame(&s->blame, view, &s->blame_complete,
3050 			    &s->first_displayed_line, &s->last_displayed_line,
3051 			    &s->selected_line, &s->done, &s->eof,
3052 			    s->path, s->blamed_commit->id, s->repo);
3053 			if (err)
3054 				break;
3055 			break;
3056 		}
3057 		case 'B': {
3058 			struct got_object_qid *first;
3059 			first = SIMPLEQ_FIRST(&s->blamed_commits);
3060 			if (!got_object_id_cmp(first->id, s->commit_id))
3061 				break;
3062 			s->done = 1;
3063 			thread_err = stop_blame(&s->blame);
3064 			s->done = 0;
3065 			if (thread_err)
3066 				break;
3067 			SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3068 			got_object_qid_free(s->blamed_commit);
3069 			s->blamed_commit =
3070 			    SIMPLEQ_FIRST(&s->blamed_commits);
3071 			err = run_blame(&s->blame, view, &s->blame_complete,
3072 			    &s->first_displayed_line, &s->last_displayed_line,
3073 			    &s->selected_line, &s->done, &s->eof, s->path,
3074 			    s->blamed_commit->id, s->repo);
3075 			if (err)
3076 				break;
3077 			break;
3078 		}
3079 		case KEY_ENTER:
3080 		case '\r': {
3081 			struct got_object_id *id = NULL;
3082 			struct got_object_qid *pid;
3083 			struct got_commit_object *commit = NULL;
3084 			id = get_selected_commit_id(s->blame.lines,
3085 			    s->first_displayed_line, s->selected_line);
3086 			if (id == NULL)
3087 				break;
3088 			err = got_object_open_as_commit(&commit, s->repo, id);
3089 			if (err)
3090 				break;
3091 			pid = SIMPLEQ_FIRST(
3092 			    got_object_commit_get_parent_ids(commit));
3093 			if (view_is_parent_view(view))
3094 			    begin_x = view_split_begin_x(view->begin_x);
3095 			diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3096 			if (diff_view == NULL) {
3097 				got_object_commit_close(commit);
3098 				err = got_error_from_errno();
3099 				break;
3100 			}
3101 			err = open_diff_view(diff_view, pid ? pid->id : NULL,
3102 			    id, NULL, s->refs, s->repo);
3103 			got_object_commit_close(commit);
3104 			if (err) {
3105 				view_close(diff_view);
3106 				break;
3107 			}
3108 			if (view_is_parent_view(view)) {
3109 				err = view_close_child(view);
3110 				if (err)
3111 					break;
3112 				err = view_set_child(view, diff_view);
3113 				if (err) {
3114 					view_close(diff_view);
3115 					break;
3116 				}
3117 				*focus_view = diff_view;
3118 				view->child_focussed = 1;
3119 			} else
3120 				*new_view = diff_view;
3121 			if (err)
3122 				break;
3123 			break;
3124 		}
3125 		case KEY_NPAGE:
3126 		case ' ':
3127 			if (s->last_displayed_line >= s->blame.nlines &&
3128 			    s->selected_line >= MIN(s->blame.nlines,
3129 			        view->nlines - 2)) {
3130 				view_flash(view);
3131 				break;
3132 			}
3133 			if (s->last_displayed_line >= s->blame.nlines &&
3134 			    s->selected_line < view->nlines - 2) {
3135 				s->selected_line = MIN(s->blame.nlines,
3136 				    view->nlines - 2);
3137 				break;
3138 			}
3139 			if (s->last_displayed_line + view->nlines - 2
3140 			    <= s->blame.nlines)
3141 				s->first_displayed_line +=
3142 				    view->nlines - 2;
3143 			else
3144 				s->first_displayed_line =
3145 				    s->blame.nlines -
3146 				    (view->nlines - 3);
3147 			break;
3148 		case KEY_RESIZE:
3149 			if (s->selected_line > view->nlines - 2) {
3150 				s->selected_line = MIN(s->blame.nlines,
3151 				    view->nlines - 2);
3152 			}
3153 			break;
3154 		default:
3155 			break;
3156 	}
3157 	return thread_err ? thread_err : err;
3158 }
3159 
3160 static const struct got_error *
3161 cmd_blame(int argc, char *argv[])
3162 {
3163 	const struct got_error *error;
3164 	struct got_repository *repo = NULL;
3165 	struct got_reflist_head refs;
3166 	struct got_worktree *worktree = NULL;
3167 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3168 	struct got_object_id *commit_id = NULL;
3169 	char *commit_id_str = NULL;
3170 	int ch;
3171 	struct tog_view *view;
3172 
3173 #ifndef PROFILE
3174 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3175 	    NULL) == -1)
3176 		err(1, "pledge");
3177 #endif
3178 
3179 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3180 		switch (ch) {
3181 		case 'c':
3182 			commit_id_str = optarg;
3183 			break;
3184 		case 'r':
3185 			repo_path = realpath(optarg, NULL);
3186 			if (repo_path == NULL)
3187 				err(1, "-r option");
3188 			break;
3189 		default:
3190 			usage_blame();
3191 			/* NOTREACHED */
3192 		}
3193 	}
3194 
3195 	argc -= optind;
3196 	argv += optind;
3197 
3198 	if (argc == 1)
3199 		path = argv[0];
3200 	else
3201 		usage_blame();
3202 
3203 	cwd = getcwd(NULL, 0);
3204 	if (cwd == NULL) {
3205 		error = got_error_from_errno();
3206 		goto done;
3207 	}
3208 	if (repo_path == NULL) {
3209 		error = got_worktree_open(&worktree, cwd);
3210 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3211 			goto done;
3212 		else
3213 			error = NULL;
3214 		if (worktree) {
3215 			repo_path =
3216 			    strdup(got_worktree_get_repo_path(worktree));
3217 			if (repo_path == NULL)
3218 				error = got_error_from_errno();
3219 			if (error)
3220 				goto done;
3221 		} else {
3222 			repo_path = strdup(cwd);
3223 			if (repo_path == NULL) {
3224 				error = got_error_from_errno();
3225 				goto done;
3226 			}
3227 		}
3228 	}
3229 
3230 	init_curses();
3231 
3232 	error = apply_unveil(repo_path, NULL);
3233 	if (error)
3234 		goto done;
3235 
3236 	error = got_repo_open(&repo, repo_path);
3237 	if (error != NULL)
3238 		goto done;
3239 
3240 	if (worktree) {
3241 		const char *prefix = got_worktree_get_path_prefix(worktree);
3242 		char *p, *worktree_subdir = cwd +
3243 		    strlen(got_worktree_get_root_path(worktree));
3244 		if (asprintf(&p, "%s%s%s%s%s",
3245 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3246 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3247 		    path) == -1) {
3248 			error = got_error_from_errno();
3249 			goto done;
3250 		}
3251 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3252 		free(p);
3253 	} else {
3254 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3255 	}
3256 	if (error)
3257 		goto done;
3258 
3259 	if (commit_id_str == NULL) {
3260 		struct got_reference *head_ref;
3261 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
3262 		if (error != NULL)
3263 			goto done;
3264 		error = got_ref_resolve(&commit_id, repo, head_ref);
3265 		got_ref_close(head_ref);
3266 	} else {
3267 		error = got_object_resolve_id_str(&commit_id, repo,
3268 		    commit_id_str);
3269 	}
3270 	if (error != NULL)
3271 		goto done;
3272 
3273 	SIMPLEQ_INIT(&refs);
3274 	error = got_ref_list(&refs, repo);
3275 	if (error)
3276 		goto done;
3277 
3278 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3279 	if (view == NULL) {
3280 		error = got_error_from_errno();
3281 		goto done;
3282 	}
3283 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3284 	if (error)
3285 		goto done;
3286 	error = view_loop(view);
3287 done:
3288 	free(repo_path);
3289 	free(cwd);
3290 	free(commit_id);
3291 	if (worktree)
3292 		got_worktree_close(worktree);
3293 	if (repo)
3294 		got_repo_close(repo);
3295 	got_ref_list_free(&refs);
3296 	return error;
3297 }
3298 
3299 static const struct got_error *
3300 draw_tree_entries(struct tog_view *view,
3301     struct got_tree_entry **first_displayed_entry,
3302     struct got_tree_entry **last_displayed_entry,
3303     struct got_tree_entry **selected_entry, int *ndisplayed,
3304     const char *label, int show_ids, const char *parent_path,
3305     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3306 {
3307 	const struct got_error *err = NULL;
3308 	struct got_tree_entry *te;
3309 	wchar_t *wline;
3310 	int width, n;
3311 
3312 	*ndisplayed = 0;
3313 
3314 	werase(view->window);
3315 
3316 	if (limit == 0)
3317 		return NULL;
3318 
3319 	err = format_line(&wline, &width, label, view->ncols);
3320 	if (err)
3321 		return err;
3322 	if (view_needs_focus_indication(view))
3323 		wstandout(view->window);
3324 	waddwstr(view->window, wline);
3325 	if (view_needs_focus_indication(view))
3326 		wstandend(view->window);
3327 	free(wline);
3328 	wline = NULL;
3329 	if (width < view->ncols)
3330 		waddch(view->window, '\n');
3331 	if (--limit <= 0)
3332 		return NULL;
3333 	err = format_line(&wline, &width, parent_path, view->ncols);
3334 	if (err)
3335 		return err;
3336 	waddwstr(view->window, wline);
3337 	free(wline);
3338 	wline = NULL;
3339 	if (width < view->ncols)
3340 		waddch(view->window, '\n');
3341 	if (--limit <= 0)
3342 		return NULL;
3343 	waddch(view->window, '\n');
3344 	if (--limit <= 0)
3345 		return NULL;
3346 
3347 	te = SIMPLEQ_FIRST(&entries->head);
3348 	if (*first_displayed_entry == NULL) {
3349 		if (selected == 0) {
3350 			if (view->focussed)
3351 				wstandout(view->window);
3352 			*selected_entry = NULL;
3353 		}
3354 		waddstr(view->window, "  ..\n");	/* parent directory */
3355 		if (selected == 0 && view->focussed)
3356 			wstandend(view->window);
3357 		(*ndisplayed)++;
3358 		if (--limit <= 0)
3359 			return NULL;
3360 		n = 1;
3361 	} else {
3362 		n = 0;
3363 		while (te != *first_displayed_entry)
3364 			te = SIMPLEQ_NEXT(te, entry);
3365 	}
3366 
3367 	while (te) {
3368 		char *line = NULL, *id_str = NULL;
3369 
3370 		if (show_ids) {
3371 			err = got_object_id_str(&id_str, te->id);
3372 			if (err)
3373 				return got_error_from_errno();
3374 		}
3375 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3376 		    te->name, S_ISDIR(te->mode) ? "/" :
3377 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3378 			free(id_str);
3379 			return got_error_from_errno();
3380 		}
3381 		free(id_str);
3382 		err = format_line(&wline, &width, line, view->ncols);
3383 		if (err) {
3384 			free(line);
3385 			break;
3386 		}
3387 		if (n == selected) {
3388 			if (view->focussed)
3389 				wstandout(view->window);
3390 			*selected_entry = te;
3391 		}
3392 		waddwstr(view->window, wline);
3393 		if (width < view->ncols)
3394 			waddch(view->window, '\n');
3395 		if (n == selected && view->focussed)
3396 			wstandend(view->window);
3397 		free(line);
3398 		free(wline);
3399 		wline = NULL;
3400 		n++;
3401 		(*ndisplayed)++;
3402 		*last_displayed_entry = te;
3403 		if (--limit <= 0)
3404 			break;
3405 		te = SIMPLEQ_NEXT(te, entry);
3406 	}
3407 
3408 	return err;
3409 }
3410 
3411 static void
3412 tree_scroll_up(struct tog_view *view,
3413     struct got_tree_entry **first_displayed_entry, int maxscroll,
3414     const struct got_tree_entries *entries, int isroot)
3415 {
3416 	struct got_tree_entry *te, *prev;
3417 	int i;
3418 
3419 	if (*first_displayed_entry == NULL) {
3420 		view_flash(view);
3421 		return;
3422 	}
3423 
3424 	te = SIMPLEQ_FIRST(&entries->head);
3425 	if (*first_displayed_entry == te) {
3426 		view_flash(view);
3427 		if (!isroot)
3428 			*first_displayed_entry = NULL;
3429 		return;
3430 	}
3431 
3432 	/* XXX this is stupid... switch to TAILQ? */
3433 	for (i = 0; i < maxscroll; i++) {
3434 		while (te != *first_displayed_entry) {
3435 			prev = te;
3436 			te = SIMPLEQ_NEXT(te, entry);
3437 		}
3438 		*first_displayed_entry = prev;
3439 		te = SIMPLEQ_FIRST(&entries->head);
3440 	}
3441 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3442 		*first_displayed_entry = NULL;
3443 }
3444 
3445 static int
3446 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3447 	struct got_tree_entry *last_displayed_entry,
3448 	const struct got_tree_entries *entries)
3449 {
3450 	struct got_tree_entry *next, *last;
3451 	int n = 0;
3452 
3453 	if (*first_displayed_entry)
3454 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3455 	else
3456 		next = SIMPLEQ_FIRST(&entries->head);
3457 	last = last_displayed_entry;
3458 	while (next && last && n++ < maxscroll) {
3459 		last = SIMPLEQ_NEXT(last, entry);
3460 		if (last) {
3461 			*first_displayed_entry = next;
3462 			next = SIMPLEQ_NEXT(next, entry);
3463 		}
3464 	}
3465 	return n;
3466 }
3467 
3468 static const struct got_error *
3469 tree_entry_path(char **path, struct tog_parent_trees *parents,
3470     struct got_tree_entry *te)
3471 {
3472 	const struct got_error *err = NULL;
3473 	struct tog_parent_tree *pt;
3474 	size_t len = 2; /* for leading slash and NUL */
3475 
3476 	TAILQ_FOREACH(pt, parents, entry)
3477 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3478 	if (te)
3479 		len += strlen(te->name);
3480 
3481 	*path = calloc(1, len);
3482 	if (path == NULL)
3483 		return got_error_from_errno();
3484 
3485 	(*path)[0] = '/';
3486 	pt = TAILQ_LAST(parents, tog_parent_trees);
3487 	while (pt) {
3488 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3489 			err = got_error(GOT_ERR_NO_SPACE);
3490 			goto done;
3491 		}
3492 		if (strlcat(*path, "/", len) >= len) {
3493 			err = got_error(GOT_ERR_NO_SPACE);
3494 			goto done;
3495 		}
3496 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3497 	}
3498 	if (te) {
3499 		if (strlcat(*path, te->name, len) >= len) {
3500 			err = got_error(GOT_ERR_NO_SPACE);
3501 			goto done;
3502 		}
3503 	}
3504 done:
3505 	if (err) {
3506 		free(*path);
3507 		*path = NULL;
3508 	}
3509 	return err;
3510 }
3511 
3512 static const struct got_error *
3513 blame_tree_entry(struct tog_view **new_view, int begin_x,
3514     struct got_tree_entry *te, struct tog_parent_trees *parents,
3515     struct got_object_id *commit_id, struct got_reflist_head *refs,
3516     struct got_repository *repo)
3517 {
3518 	const struct got_error *err = NULL;
3519 	char *path;
3520 	struct tog_view *blame_view;
3521 
3522 	err = tree_entry_path(&path, parents, te);
3523 	if (err)
3524 		return err;
3525 
3526 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3527 	if (blame_view == NULL)
3528 		return got_error_from_errno();
3529 
3530 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3531 	if (err) {
3532 		view_close(blame_view);
3533 		free(path);
3534 	} else
3535 		*new_view = blame_view;
3536 	return err;
3537 }
3538 
3539 static const struct got_error *
3540 log_tree_entry(struct tog_view **new_view, int begin_x,
3541     struct got_tree_entry *te, struct tog_parent_trees *parents,
3542     struct got_object_id *commit_id, struct got_reflist_head *refs,
3543     struct got_repository *repo)
3544 {
3545 	struct tog_view *log_view;
3546 	const struct got_error *err = NULL;
3547 	char *path;
3548 
3549 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3550 	if (log_view == NULL)
3551 		return got_error_from_errno();
3552 
3553 	err = tree_entry_path(&path, parents, te);
3554 	if (err)
3555 		return err;
3556 
3557 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3558 	if (err)
3559 		view_close(log_view);
3560 	else
3561 		*new_view = log_view;
3562 	free(path);
3563 	return err;
3564 }
3565 
3566 static const struct got_error *
3567 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3568     struct got_object_id *commit_id, struct got_reflist_head *refs,
3569     struct got_repository *repo)
3570 {
3571 	const struct got_error *err = NULL;
3572 	char *commit_id_str = NULL;
3573 	struct tog_tree_view_state *s = &view->state.tree;
3574 
3575 	TAILQ_INIT(&s->parents);
3576 
3577 	err = got_object_id_str(&commit_id_str, commit_id);
3578 	if (err != NULL)
3579 		goto done;
3580 
3581 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3582 		err = got_error_from_errno();
3583 		goto done;
3584 	}
3585 
3586 	s->root = s->tree = root;
3587 	s->entries = got_object_tree_get_entries(root);
3588 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3589 	s->commit_id = got_object_id_dup(commit_id);
3590 	if (s->commit_id == NULL) {
3591 		err = got_error_from_errno();
3592 		goto done;
3593 	}
3594 	s->refs = refs;
3595 	s->repo = repo;
3596 
3597 	view->show = show_tree_view;
3598 	view->input = input_tree_view;
3599 	view->close = close_tree_view;
3600 done:
3601 	free(commit_id_str);
3602 	if (err) {
3603 		free(s->tree_label);
3604 		s->tree_label = NULL;
3605 	}
3606 	return err;
3607 }
3608 
3609 static const struct got_error *
3610 close_tree_view(struct tog_view *view)
3611 {
3612 	struct tog_tree_view_state *s = &view->state.tree;
3613 
3614 	free(s->tree_label);
3615 	s->tree_label = NULL;
3616 	free(s->commit_id);
3617 	s->commit_id = NULL;
3618 	while (!TAILQ_EMPTY(&s->parents)) {
3619 		struct tog_parent_tree *parent;
3620 		parent = TAILQ_FIRST(&s->parents);
3621 		TAILQ_REMOVE(&s->parents, parent, entry);
3622 		free(parent);
3623 
3624 	}
3625 	if (s->tree != s->root)
3626 		got_object_tree_close(s->tree);
3627 	got_object_tree_close(s->root);
3628 
3629 	return NULL;
3630 }
3631 
3632 static const struct got_error *
3633 show_tree_view(struct tog_view *view)
3634 {
3635 	const struct got_error *err = NULL;
3636 	struct tog_tree_view_state *s = &view->state.tree;
3637 	char *parent_path;
3638 
3639 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3640 	if (err)
3641 		return err;
3642 
3643 	err = draw_tree_entries(view, &s->first_displayed_entry,
3644 	    &s->last_displayed_entry, &s->selected_entry,
3645 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3646 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3647 	free(parent_path);
3648 
3649 	view_vborder(view);
3650 	return err;
3651 }
3652 
3653 static const struct got_error *
3654 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3655     struct tog_view **focus_view, struct tog_view *view, int ch)
3656 {
3657 	const struct got_error *err = NULL;
3658 	struct tog_tree_view_state *s = &view->state.tree;
3659 	struct tog_view *log_view;
3660 	int begin_x = 0, nscrolled;
3661 
3662 	switch (ch) {
3663 		case 'i':
3664 			s->show_ids = !s->show_ids;
3665 			break;
3666 		case 'l':
3667 			if (!s->selected_entry)
3668 				break;
3669 			if (view_is_parent_view(view))
3670 				begin_x = view_split_begin_x(view->begin_x);
3671 			err = log_tree_entry(&log_view, begin_x,
3672 			    s->selected_entry, &s->parents,
3673 			    s->commit_id, s->refs, s->repo);
3674 			if (view_is_parent_view(view)) {
3675 				err = view_close_child(view);
3676 				if (err)
3677 					return err;
3678 				err = view_set_child(view, log_view);
3679 				if (err) {
3680 					view_close(log_view);
3681 					break;
3682 				}
3683 				*focus_view = log_view;
3684 				view->child_focussed = 1;
3685 			} else
3686 				*new_view = log_view;
3687 			break;
3688 		case 'k':
3689 		case KEY_UP:
3690 			if (s->selected > 0) {
3691 				s->selected--;
3692 				if (s->selected == 0)
3693 					break;
3694 			}
3695 			if (s->selected > 0)
3696 				break;
3697 			tree_scroll_up(view, &s->first_displayed_entry, 1,
3698 			    s->entries, s->tree == s->root);
3699 			break;
3700 		case KEY_PPAGE:
3701 			tree_scroll_up(view, &s->first_displayed_entry,
3702 			    MAX(0, view->nlines - 4 - s->selected), s->entries,
3703 			    s->tree == s->root);
3704 			s->selected = 0;
3705 			if (SIMPLEQ_FIRST(&s->entries->head) ==
3706 			    s->first_displayed_entry && s->tree != s->root)
3707 				s->first_displayed_entry = NULL;
3708 			break;
3709 		case 'j':
3710 		case KEY_DOWN:
3711 			if (s->selected < s->ndisplayed - 1) {
3712 				s->selected++;
3713 				break;
3714 			}
3715 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3716 			    == NULL) {
3717 				/* can't scroll any further */
3718 				view_flash(view);
3719 				break;
3720 			}
3721 			tree_scroll_down(&s->first_displayed_entry, 1,
3722 			    s->last_displayed_entry, s->entries);
3723 			break;
3724 		case KEY_NPAGE:
3725 			if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3726 			    == NULL) {
3727 				/* can't scroll any further; move cursor down */
3728 				if (s->selected < s->ndisplayed - 1)
3729 					s->selected = s->ndisplayed - 1;
3730 				else
3731 					view_flash(view);
3732 				break;
3733 			}
3734 			nscrolled = tree_scroll_down(&s->first_displayed_entry,
3735 			    view->nlines, s->last_displayed_entry, s->entries);
3736 			if (nscrolled < view->nlines) {
3737 				int ndisplayed = 0;
3738 				struct got_tree_entry *te;
3739 				te = s->first_displayed_entry;
3740 				do {
3741 					ndisplayed++;
3742 					te = SIMPLEQ_NEXT(te, entry);
3743 				} while (te);
3744 				s->selected = ndisplayed - 1;
3745 			}
3746 			break;
3747 		case KEY_ENTER:
3748 		case '\r':
3749 			if (s->selected_entry == NULL) {
3750 				struct tog_parent_tree *parent;
3751 		case KEY_BACKSPACE:
3752 				/* user selected '..' */
3753 				if (s->tree == s->root)
3754 					break;
3755 				parent = TAILQ_FIRST(&s->parents);
3756 				TAILQ_REMOVE(&s->parents, parent,
3757 				    entry);
3758 				got_object_tree_close(s->tree);
3759 				s->tree = parent->tree;
3760 				s->entries =
3761 				    got_object_tree_get_entries(s->tree);
3762 				s->first_displayed_entry =
3763 				    parent->first_displayed_entry;
3764 				s->selected_entry =
3765 				    parent->selected_entry;
3766 				s->selected = parent->selected;
3767 				free(parent);
3768 			} else if (S_ISDIR(s->selected_entry->mode)) {
3769 				struct tog_parent_tree *parent;
3770 				struct got_tree_object *child;
3771 				err = got_object_open_as_tree(&child,
3772 				    s->repo, s->selected_entry->id);
3773 				if (err)
3774 					break;
3775 				parent = calloc(1, sizeof(*parent));
3776 				if (parent == NULL) {
3777 					err = got_error_from_errno();
3778 					break;
3779 				}
3780 				parent->tree = s->tree;
3781 				parent->first_displayed_entry =
3782 				   s->first_displayed_entry;
3783 				parent->selected_entry = s->selected_entry;
3784 				parent->selected = s->selected;
3785 				TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3786 				s->tree = child;
3787 				s->entries =
3788 				    got_object_tree_get_entries(s->tree);
3789 				s->selected = 0;
3790 				s->first_displayed_entry = NULL;
3791 			} else if (S_ISREG(s->selected_entry->mode)) {
3792 				struct tog_view *blame_view;
3793 				int begin_x = view_is_parent_view(view) ?
3794 				    view_split_begin_x(view->begin_x) : 0;
3795 
3796 				err = blame_tree_entry(&blame_view, begin_x,
3797 				    s->selected_entry, &s->parents,
3798 				    s->commit_id, s->refs, s->repo);
3799 				if (err)
3800 					break;
3801 				if (view_is_parent_view(view)) {
3802 					err = view_close_child(view);
3803 					if (err)
3804 						return err;
3805 					err = view_set_child(view, blame_view);
3806 					if (err) {
3807 						view_close(blame_view);
3808 						break;
3809 					}
3810 					*focus_view = blame_view;
3811 					view->child_focussed = 1;
3812 				} else
3813 					*new_view = blame_view;
3814 			}
3815 			break;
3816 		case KEY_RESIZE:
3817 			if (s->selected > view->nlines)
3818 				s->selected = s->ndisplayed - 1;
3819 			break;
3820 		default:
3821 			break;
3822 	}
3823 
3824 	return err;
3825 }
3826 
3827 __dead static void
3828 usage_tree(void)
3829 {
3830 	endwin();
3831 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3832 	    getprogname());
3833 	exit(1);
3834 }
3835 
3836 static const struct got_error *
3837 cmd_tree(int argc, char *argv[])
3838 {
3839 	const struct got_error *error;
3840 	struct got_repository *repo = NULL;
3841 	struct got_reflist_head refs;
3842 	char *repo_path = NULL;
3843 	struct got_object_id *commit_id = NULL;
3844 	char *commit_id_arg = NULL;
3845 	struct got_commit_object *commit = NULL;
3846 	struct got_tree_object *tree = NULL;
3847 	int ch;
3848 	struct tog_view *view;
3849 
3850 #ifndef PROFILE
3851 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3852 	    NULL) == -1)
3853 		err(1, "pledge");
3854 #endif
3855 
3856 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3857 		switch (ch) {
3858 		case 'c':
3859 			commit_id_arg = optarg;
3860 			break;
3861 		default:
3862 			usage_tree();
3863 			/* NOTREACHED */
3864 		}
3865 	}
3866 
3867 	argc -= optind;
3868 	argv += optind;
3869 
3870 	if (argc == 0) {
3871 		struct got_worktree *worktree;
3872 		char *cwd = getcwd(NULL, 0);
3873 		if (cwd == NULL)
3874 			return got_error_from_errno();
3875 		error = got_worktree_open(&worktree, cwd);
3876 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3877 			goto done;
3878 		if (worktree) {
3879 			free(cwd);
3880 			repo_path =
3881 			    strdup(got_worktree_get_repo_path(worktree));
3882 			got_worktree_close(worktree);
3883 		} else
3884 			repo_path = cwd;
3885 		if (repo_path == NULL) {
3886 			error = got_error_from_errno();
3887 			goto done;
3888 		}
3889 	} else if (argc == 1) {
3890 		repo_path = realpath(argv[0], NULL);
3891 		if (repo_path == NULL)
3892 			return got_error_from_errno();
3893 	} else
3894 		usage_log();
3895 
3896 	init_curses();
3897 
3898 	error = apply_unveil(repo_path, NULL);
3899 	if (error)
3900 		goto done;
3901 
3902 	error = got_repo_open(&repo, repo_path);
3903 	if (error != NULL)
3904 		goto done;
3905 
3906 	if (commit_id_arg == NULL)
3907 		error = get_head_commit_id(&commit_id, repo);
3908 	else
3909 		error = got_object_resolve_id_str(&commit_id, repo,
3910 		    commit_id_arg);
3911 	if (error != NULL)
3912 		goto done;
3913 
3914 	error = got_object_open_as_commit(&commit, repo, commit_id);
3915 	if (error != NULL)
3916 		goto done;
3917 
3918 	error = got_object_open_as_tree(&tree, repo,
3919 	    got_object_commit_get_tree_id(commit));
3920 	if (error != NULL)
3921 		goto done;
3922 
3923 	SIMPLEQ_INIT(&refs);
3924 	error = got_ref_list(&refs, repo);
3925 	if (error)
3926 		goto done;
3927 
3928 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3929 	if (view == NULL) {
3930 		error = got_error_from_errno();
3931 		goto done;
3932 	}
3933 	error = open_tree_view(view, tree, commit_id, &refs, repo);
3934 	if (error)
3935 		goto done;
3936 	error = view_loop(view);
3937 done:
3938 	free(repo_path);
3939 	free(commit_id);
3940 	if (commit)
3941 		got_object_commit_close(commit);
3942 	if (tree)
3943 		got_object_tree_close(tree);
3944 	if (repo)
3945 		got_repo_close(repo);
3946 	got_ref_list_free(&refs);
3947 	return error;
3948 }
3949 
3950 __dead static void
3951 usage(void)
3952 {
3953 	int i;
3954 
3955 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3956 	    "Available commands:\n", getprogname());
3957 	for (i = 0; i < nitems(tog_commands); i++) {
3958 		struct tog_cmd *cmd = &tog_commands[i];
3959 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3960 	}
3961 	exit(1);
3962 }
3963 
3964 static char **
3965 make_argv(const char *arg0, const char *arg1)
3966 {
3967 	char **argv;
3968 	int argc = (arg1 == NULL ? 1 : 2);
3969 
3970 	argv = calloc(argc, sizeof(char *));
3971 	if (argv == NULL)
3972 		err(1, "calloc");
3973 	argv[0] = strdup(arg0);
3974 	if (argv[0] == NULL)
3975 		err(1, "calloc");
3976 	if (arg1) {
3977 		argv[1] = strdup(arg1);
3978 		if (argv[1] == NULL)
3979 			err(1, "calloc");
3980 	}
3981 
3982 	return argv;
3983 }
3984 
3985 int
3986 main(int argc, char *argv[])
3987 {
3988 	const struct got_error *error = NULL;
3989 	struct tog_cmd *cmd = NULL;
3990 	int ch, hflag = 0;
3991 	char **cmd_argv = NULL;
3992 
3993 	setlocale(LC_CTYPE, "");
3994 
3995 	while ((ch = getopt(argc, argv, "h")) != -1) {
3996 		switch (ch) {
3997 		case 'h':
3998 			hflag = 1;
3999 			break;
4000 		default:
4001 			usage();
4002 			/* NOTREACHED */
4003 		}
4004 	}
4005 
4006 	argc -= optind;
4007 	argv += optind;
4008 	optind = 0;
4009 	optreset = 1;
4010 
4011 	if (argc == 0) {
4012 		if (hflag)
4013 			usage();
4014 		/* Build an argument vector which runs a default command. */
4015 		cmd = &tog_commands[0];
4016 		cmd_argv = make_argv(cmd->name, NULL);
4017 		argc = 1;
4018 	} else {
4019 		int i;
4020 
4021 		/* Did the user specific a command? */
4022 		for (i = 0; i < nitems(tog_commands); i++) {
4023 			if (strncmp(tog_commands[i].name, argv[0],
4024 			    strlen(argv[0])) == 0) {
4025 				cmd = &tog_commands[i];
4026 				if (hflag)
4027 					tog_commands[i].cmd_usage();
4028 				break;
4029 			}
4030 		}
4031 		if (cmd == NULL) {
4032 			/* Did the user specify a repository? */
4033 			char *repo_path = realpath(argv[0], NULL);
4034 			if (repo_path) {
4035 				struct got_repository *repo;
4036 				error = got_repo_open(&repo, repo_path);
4037 				if (error == NULL)
4038 					got_repo_close(repo);
4039 			} else
4040 				error = got_error_from_errno();
4041 			if (error) {
4042 				if (hflag) {
4043 					fprintf(stderr, "%s: '%s' is not a "
4044 					    "known command\n", getprogname(),
4045 					    argv[0]);
4046 					usage();
4047 				}
4048 				fprintf(stderr, "%s: '%s' is neither a known "
4049 				    "command nor a path to a repository\n",
4050 				    getprogname(), argv[0]);
4051 				free(repo_path);
4052 				return 1;
4053 			}
4054 			cmd = &tog_commands[0];
4055 			cmd_argv = make_argv(cmd->name, repo_path);
4056 			argc = 2;
4057 			free(repo_path);
4058 		}
4059 	}
4060 
4061 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4062 	if (error)
4063 		goto done;
4064 done:
4065 	endwin();
4066 	free(cmd_argv);
4067 	if (error)
4068 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4069 	return 0;
4070 }