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_path.h"
51 #include "got_worktree.h"
52 
53 #ifndef MIN
54 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
55 #endif
56 
57 #ifndef MAX
58 #define	MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
59 #endif
60 
61 #define CTRL(x)		((x) & 0x1f)
62 
63 #ifndef nitems
64 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
65 #endif
66 
67 struct tog_cmd {
68 	const char *name;
69 	const struct got_error *(*cmd_main)(int, char *[]);
70 	void (*cmd_usage)(void);
71 	const char *descr;
72 };
73 
74 __dead static void	usage(void);
75 __dead static void	usage_log(void);
76 __dead static void	usage_diff(void);
77 __dead static void	usage_blame(void);
78 __dead static void	usage_tree(void);
79 
80 static const struct got_error*	cmd_log(int, char *[]);
81 static const struct got_error*	cmd_diff(int, char *[]);
82 static const struct got_error*	cmd_blame(int, char *[]);
83 static const struct got_error*	cmd_tree(int, char *[]);
84 
85 static struct tog_cmd tog_commands[] = {
86 	{ "log",	cmd_log,	usage_log,
87 	    "show repository history" },
88 	{ "diff",	cmd_diff,	usage_diff,
89 	    "compare files and directories" },
90 	{ "blame",	cmd_blame,	usage_blame,
91 	    "show line-by-line file history" },
92 	{ "tree",	cmd_tree,	usage_tree,
93 	    "browse trees in repository" },
94 };
95 
96 enum tog_view_type {
97 	TOG_VIEW_DIFF,
98 	TOG_VIEW_LOG,
99 	TOG_VIEW_BLAME,
100 	TOG_VIEW_TREE
101 };
102 
103 #define TOG_EOF_STRING	"(END)"
104 
105 struct commit_queue_entry {
106 	TAILQ_ENTRY(commit_queue_entry) entry;
107 	struct got_object_id *id;
108 	struct got_commit_object *commit;
109 	int idx;
110 };
111 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
112 struct commit_queue {
113 	int ncommits;
114 	struct commit_queue_head head;
115 };
116 
117 struct tog_diff_view_state {
118 	struct got_object_id *id1, *id2;
119 	FILE *f;
120 	int first_displayed_line;
121 	int last_displayed_line;
122 	int eof;
123 	int diff_context;
124 	struct got_repository *repo;
125 	struct got_reflist_head *refs;
126 
127 	/* passed from log view; may be NULL */
128 	struct tog_view *log_view;
129 };
130 
131 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
132 
133 struct tog_log_thread_args {
134 	pthread_cond_t need_commits;
135 	int commits_needed;
136 	struct got_commit_graph *graph;
137 	struct commit_queue *commits;
138 	const char *in_repo_path;
139 	struct got_object_id *start_id;
140 	struct got_repository *repo;
141 	int log_complete;
142 	sig_atomic_t *quit;
143 	struct tog_view *view;
144 	struct commit_queue_entry **first_displayed_entry;
145 	struct commit_queue_entry **selected_entry;
146 };
147 
148 struct tog_log_view_state {
149 	struct commit_queue commits;
150 	struct commit_queue_entry *first_displayed_entry;
151 	struct commit_queue_entry *last_displayed_entry;
152 	struct commit_queue_entry *selected_entry;
153 	int selected;
154 	char *in_repo_path;
155 	struct got_repository *repo;
156 	struct got_reflist_head *refs;
157 	struct got_object_id *start_id;
158 	sig_atomic_t quit;
159 	pthread_t thread;
160 	struct tog_log_thread_args thread_args;
161 };
162 
163 struct tog_blame_cb_args {
164 	struct tog_blame_line *lines; /* one per line */
165 	int nlines;
166 
167 	struct tog_view *view;
168 	struct got_object_id *commit_id;
169 	int *quit;
170 };
171 
172 struct tog_blame_thread_args {
173 	const char *path;
174 	struct got_repository *repo;
175 	struct tog_blame_cb_args *cb_args;
176 	int *complete;
177 };
178 
179 struct tog_blame {
180 	FILE *f;
181 	size_t filesize;
182 	struct tog_blame_line *lines;
183 	int nlines;
184 	pthread_t thread;
185 	struct tog_blame_thread_args thread_args;
186 	struct tog_blame_cb_args cb_args;
187 	const char *path;
188 };
189 
190 struct tog_blame_view_state {
191 	int first_displayed_line;
192 	int last_displayed_line;
193 	int selected_line;
194 	int blame_complete;
195 	int eof;
196 	int done;
197 	struct got_object_id_queue blamed_commits;
198 	struct got_object_qid *blamed_commit;
199 	char *path;
200 	struct got_repository *repo;
201 	struct got_reflist_head *refs;
202 	struct got_object_id *commit_id;
203 	struct tog_blame blame;
204 };
205 
206 struct tog_parent_tree {
207 	TAILQ_ENTRY(tog_parent_tree) entry;
208 	struct got_tree_object *tree;
209 	struct got_tree_entry *first_displayed_entry;
210 	struct got_tree_entry *selected_entry;
211 	int selected;
212 };
213 
214 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
215 
216 struct tog_tree_view_state {
217 	char *tree_label;
218 	struct got_tree_object *root;
219 	struct got_tree_object *tree;
220 	const struct got_tree_entries *entries;
221 	struct got_tree_entry *first_displayed_entry;
222 	struct got_tree_entry *last_displayed_entry;
223 	struct got_tree_entry *selected_entry;
224 	int ndisplayed, selected, show_ids;
225 	struct tog_parent_trees parents;
226 	struct got_object_id *commit_id;
227 	struct got_repository *repo;
228 	struct got_reflist_head *refs;
229 };
230 
231 /*
232  * We implement two types of views: parent views and child views.
233  *
234  * The 'Tab' key switches between a parent view and its child view.
235  * Child views are shown side-by-side to their parent view, provided
236  * there is enough screen estate.
237  *
238  * When a new view is opened from within a parent view, this new view
239  * becomes a child view of the parent view, replacing any existing child.
240  *
241  * When a new view is opened from within a child view, this new view
242  * becomes a parent view which will obscure the views below until the
243  * user quits the new parent view by typing 'q'.
244  *
245  * This list of views contains parent views only.
246  * Child views are only pointed to by their parent view.
247  */
248 TAILQ_HEAD(tog_view_list_head, tog_view);
249 
250 struct tog_view {
251 	TAILQ_ENTRY(tog_view) entry;
252 	WINDOW *window;
253 	PANEL *panel;
254 	int nlines, ncols, begin_y, begin_x;
255 	int lines, cols; /* copies of LINES and COLS */
256 	int focussed;
257 	struct tog_view *parent;
258 	struct tog_view *child;
259 	int child_focussed;
260 
261 	/* type-specific state */
262 	enum tog_view_type type;
263 	union {
264 		struct tog_diff_view_state diff;
265 		struct tog_log_view_state log;
266 		struct tog_blame_view_state blame;
267 		struct tog_tree_view_state tree;
268 	} state;
269 
270 	const struct got_error *(*show)(struct tog_view *);
271 	const struct got_error *(*input)(struct tog_view **,
272 	    struct tog_view **, struct tog_view**, struct tog_view *, int);
273 	const struct got_error *(*close)(struct tog_view *);
274 };
275 
276 static const struct got_error *open_diff_view(struct tog_view *,
277     struct got_object_id *, struct got_object_id *, struct tog_view *,
278     struct got_reflist_head *, struct got_repository *);
279 static const struct got_error *show_diff_view(struct tog_view *);
280 static const struct got_error *input_diff_view(struct tog_view **,
281     struct tog_view **, struct tog_view **, struct tog_view *, int);
282 static const struct got_error* close_diff_view(struct tog_view *);
283 
284 static const struct got_error *open_log_view(struct tog_view *,
285     struct got_object_id *, struct got_reflist_head *,
286     struct got_repository *, const char *, int);
287 static const struct got_error * show_log_view(struct tog_view *);
288 static const struct got_error *input_log_view(struct tog_view **,
289     struct tog_view **, struct tog_view **, struct tog_view *, int);
290 static const struct got_error *close_log_view(struct tog_view *);
291 
292 static const struct got_error *open_blame_view(struct tog_view *, char *,
293     struct got_object_id *, struct got_reflist_head *, struct got_repository *);
294 static const struct got_error *show_blame_view(struct tog_view *);
295 static const struct got_error *input_blame_view(struct tog_view **,
296     struct tog_view **, struct tog_view **, struct tog_view *, int);
297 static const struct got_error *close_blame_view(struct tog_view *);
298 
299 static const struct got_error *open_tree_view(struct tog_view *,
300     struct got_tree_object *, struct got_object_id *,
301     struct got_reflist_head *, struct got_repository *);
302 static const struct got_error *show_tree_view(struct tog_view *);
303 static const struct got_error *input_tree_view(struct tog_view **,
304     struct tog_view **, struct tog_view **, struct tog_view *, int);
305 static const struct got_error *close_tree_view(struct tog_view *);
306 
307 static volatile sig_atomic_t tog_sigwinch_received;
308 
309 static void
310 tog_sigwinch(int signo)
311 {
312 	tog_sigwinch_received = 1;
313 }
314 
315 static const struct got_error *
316 view_close(struct tog_view *view)
317 {
318 	const struct got_error *err = NULL;
319 
320 	if (view->child) {
321 		view_close(view->child);
322 		view->child = NULL;
323 	}
324 	if (view->close)
325 		err = view->close(view);
326 	if (view->panel)
327 		del_panel(view->panel);
328 	if (view->window)
329 		delwin(view->window);
330 	free(view);
331 	return err;
332 }
333 
334 static struct tog_view *
335 view_open(int nlines, int ncols, int begin_y, int begin_x,
336     enum tog_view_type type)
337 {
338 	struct tog_view *view = calloc(1, sizeof(*view));
339 
340 	if (view == NULL)
341 		return NULL;
342 
343 	view->type = type;
344 	view->lines = LINES;
345 	view->cols = COLS;
346 	view->nlines = nlines ? nlines : LINES - begin_y;
347 	view->ncols = ncols ? ncols : COLS - begin_x;
348 	view->begin_y = begin_y;
349 	view->begin_x = begin_x;
350 	view->window = newwin(nlines, ncols, begin_y, begin_x);
351 	if (view->window == NULL) {
352 		view_close(view);
353 		return NULL;
354 	}
355 	view->panel = new_panel(view->window);
356 	if (view->panel == NULL ||
357 	    set_panel_userptr(view->panel, view) != OK) {
358 		view_close(view);
359 		return NULL;
360 	}
361 
362 	keypad(view->window, TRUE);
363 	return view;
364 }
365 
366 static int
367 view_split_begin_x(int begin_x)
368 {
369 	if (begin_x > 0 || COLS < 120)
370 		return 0;
371 	return (COLS - MAX(COLS / 2, 80));
372 }
373 
374 static const struct got_error *view_resize(struct tog_view *);
375 
376 static const struct got_error *
377 view_splitscreen(struct tog_view *view)
378 {
379 	const struct got_error *err = NULL;
380 
381 	view->begin_y = 0;
382 	view->begin_x = view_split_begin_x(0);
383 	view->nlines = LINES;
384 	view->ncols = COLS - view->begin_x;
385 	view->lines = LINES;
386 	view->cols = COLS;
387 	err = view_resize(view);
388 	if (err)
389 		return err;
390 
391 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
392 		return got_error_from_errno("mvwin");
393 
394 	return NULL;
395 }
396 
397 static const struct got_error *
398 view_fullscreen(struct tog_view *view)
399 {
400 	const struct got_error *err = NULL;
401 
402 	view->begin_x = 0;
403 	view->begin_y = 0;
404 	view->nlines = LINES;
405 	view->ncols = COLS;
406 	view->lines = LINES;
407 	view->cols = COLS;
408 	err = view_resize(view);
409 	if (err)
410 		return err;
411 
412 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
413 		return got_error_from_errno("mvwin");
414 
415 	return NULL;
416 }
417 
418 static int
419 view_is_parent_view(struct tog_view *view)
420 {
421 	return view->parent == NULL;
422 }
423 
424 static const struct got_error *
425 view_resize(struct tog_view *view)
426 {
427 	int nlines, ncols;
428 
429 	if (view->lines > LINES)
430 		nlines = view->nlines - (view->lines - LINES);
431 	else
432 		nlines = view->nlines + (LINES - view->lines);
433 
434 	if (view->cols > COLS)
435 		ncols = view->ncols - (view->cols - COLS);
436 	else
437 		ncols = view->ncols + (COLS - view->cols);
438 
439 	if (wresize(view->window, nlines, ncols) == ERR)
440 		return got_error_from_errno("wresize");
441 	if (replace_panel(view->panel, view->window) == ERR)
442 		return got_error_from_errno("replace_panel");
443 	wclear(view->window);
444 
445 	view->nlines = nlines;
446 	view->ncols = ncols;
447 	view->lines = LINES;
448 	view->cols = COLS;
449 
450 	if (view->child) {
451 		view->child->begin_x = view_split_begin_x(view->begin_x);
452 		if (view->child->begin_x == 0) {
453 			view_fullscreen(view->child);
454 			if (view->child->focussed)
455 				show_panel(view->child->panel);
456 			else
457 				show_panel(view->panel);
458 		} else {
459 			view_splitscreen(view->child);
460 			show_panel(view->child->panel);
461 		}
462 	}
463 
464 	return NULL;
465 }
466 
467 static const struct got_error *
468 view_close_child(struct tog_view *view)
469 {
470 	const struct got_error *err = NULL;
471 
472 	if (view->child == NULL)
473 		return NULL;
474 
475 	err = view_close(view->child);
476 	view->child = NULL;
477 	return err;
478 }
479 
480 static const struct got_error *
481 view_set_child(struct tog_view *view, struct tog_view *child)
482 {
483 	const struct got_error *err = NULL;
484 
485 	view->child = child;
486 	child->parent = view;
487 	return err;
488 }
489 
490 static int
491 view_is_splitscreen(struct tog_view *view)
492 {
493 	return view->begin_x > 0;
494 }
495 
496 static void
497 tog_resizeterm(void)
498 {
499 	int cols, lines;
500 	struct winsize size;
501 
502 	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &size) < 0) {
503 		cols = 80;     /* Default */
504 		lines = 24;
505 	} else {
506 		cols = size.ws_col;
507 		lines = size.ws_row;
508 	}
509 	resize_term(lines, cols);
510 }
511 
512 static const struct got_error *
513 view_input(struct tog_view **new, struct tog_view **dead,
514     struct tog_view **focus, int *done, struct tog_view *view,
515     struct tog_view_list_head *views)
516 {
517 	const struct got_error *err = NULL;
518 	struct tog_view *v;
519 	int ch, errcode;
520 
521 	*new = NULL;
522 	*dead = NULL;
523 	*focus = NULL;
524 
525 	nodelay(stdscr, FALSE);
526 	/* Allow threads to make progress while we are waiting for input. */
527 	errcode = pthread_mutex_unlock(&tog_mutex);
528 	if (errcode)
529 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
530 	ch = wgetch(view->window);
531 	errcode = pthread_mutex_lock(&tog_mutex);
532 	if (errcode)
533 		return got_error_set_errno(errcode, "pthread_mutex_lock");
534 	nodelay(stdscr, TRUE);
535 
536 	if (tog_sigwinch_received) {
537 		tog_resizeterm();
538 		tog_sigwinch_received = 0;
539 		TAILQ_FOREACH(v, views, entry) {
540 			err = view_resize(v);
541 			if (err)
542 				return err;
543 			err = v->input(new, dead, focus, v, KEY_RESIZE);
544 			if (err)
545 				return err;
546 		}
547 	}
548 
549 	switch (ch) {
550 	case ERR:
551 		break;
552 	case '\t':
553 		if (view->child) {
554 			*focus = view->child;
555 			view->child_focussed = 1;
556 		} else if (view->parent) {
557 			*focus = view->parent;
558 			view->parent->child_focussed = 0;
559 		}
560 		break;
561 	case 'q':
562 		err = view->input(new, dead, focus, view, ch);
563 		*dead = view;
564 		break;
565 	case 'Q':
566 		*done = 1;
567 		break;
568 	case 'f':
569 		if (view_is_parent_view(view)) {
570 			if (view->child == NULL)
571 				break;
572 			if (view_is_splitscreen(view->child)) {
573 				*focus = view->child;
574 				view->child_focussed = 1;
575 				err = view_fullscreen(view->child);
576 			} else
577 				err = view_splitscreen(view->child);
578 			if (err)
579 				break;
580 			err = view->child->input(new, dead, focus,
581 			    view->child, KEY_RESIZE);
582 		} else {
583 			if (view_is_splitscreen(view)) {
584 				*focus = view;
585 				view->parent->child_focussed = 1;
586 				err = view_fullscreen(view);
587 			} else {
588 				err = view_splitscreen(view);
589 			}
590 			if (err)
591 				break;
592 			err = view->input(new, dead, focus, view,
593 			    KEY_RESIZE);
594 		}
595 		break;
596 	case KEY_RESIZE:
597 		break;
598 	default:
599 		err = view->input(new, dead, focus, view, ch);
600 		break;
601 	}
602 
603 	return err;
604 }
605 
606 void
607 view_vborder(struct tog_view *view)
608 {
609 	PANEL *panel;
610 	struct tog_view *view_above;
611 
612 	if (view->parent)
613 		return view_vborder(view->parent);
614 
615 	panel = panel_above(view->panel);
616 	if (panel == NULL)
617 		return;
618 
619 	view_above = panel_userptr(panel);
620 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
621 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
622 }
623 
624 int
625 view_needs_focus_indication(struct tog_view *view)
626 {
627 	if (view_is_parent_view(view)) {
628 		if (view->child == NULL || view->child_focussed)
629 			return 0;
630 		if (!view_is_splitscreen(view->child))
631 			return 0;
632 	} else if (!view_is_splitscreen(view))
633 		return 0;
634 
635 	return view->focussed;
636 }
637 
638 static const struct got_error *
639 view_loop(struct tog_view *view)
640 {
641 	const struct got_error *err = NULL;
642 	struct tog_view_list_head views;
643 	struct tog_view *new_view, *dead_view, *focus_view, *main_view;
644 	int fast_refresh = 10;
645 	int done = 0, errcode;
646 
647 	errcode = pthread_mutex_lock(&tog_mutex);
648 	if (errcode)
649 		return got_error_set_errno(errcode, "pthread_mutex_lock");
650 
651 	TAILQ_INIT(&views);
652 	TAILQ_INSERT_HEAD(&views, view, entry);
653 
654 	main_view = view;
655 	view->focussed = 1;
656 	err = view->show(view);
657 	if (err)
658 		return err;
659 	update_panels();
660 	doupdate();
661 	while (!TAILQ_EMPTY(&views) && !done) {
662 		/* Refresh fast during initialization, then become slower. */
663 		if (fast_refresh && fast_refresh-- == 0)
664 			halfdelay(10); /* switch to once per second */
665 
666 		err = view_input(&new_view, &dead_view, &focus_view, &done,
667 		    view, &views);
668 		if (err)
669 			break;
670 		if (dead_view) {
671 			struct tog_view *prev = NULL;
672 
673 			if (view_is_parent_view(dead_view))
674 				prev = TAILQ_PREV(dead_view,
675 				    tog_view_list_head, entry);
676 			else if (view->parent != dead_view)
677 				prev = view->parent;
678 
679 			if (dead_view->parent)
680 				dead_view->parent->child = NULL;
681 			else
682 				TAILQ_REMOVE(&views, dead_view, entry);
683 
684 			err = view_close(dead_view);
685 			if (err || dead_view == main_view)
686 				goto done;
687 
688 			if (view == dead_view) {
689 				if (focus_view)
690 					view = focus_view;
691 				else if (prev)
692 					view = prev;
693 				else if (!TAILQ_EMPTY(&views))
694 					view = TAILQ_LAST(&views,
695 					    tog_view_list_head);
696 				else
697 					view = NULL;
698 				if (view) {
699 					if (view->child && view->child_focussed)
700 						focus_view = view->child;
701 					else
702 						focus_view = view;
703 				}
704 			}
705 		}
706 		if (new_view) {
707 			struct tog_view *v, *t;
708 			/* Only allow one parent view per type. */
709 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
710 				if (v->type != new_view->type)
711 					continue;
712 				TAILQ_REMOVE(&views, v, entry);
713 				err = view_close(v);
714 				if (err)
715 					goto done;
716 				break;
717 			}
718 			TAILQ_INSERT_TAIL(&views, new_view, entry);
719 			view = new_view;
720 			if (focus_view == NULL)
721 				focus_view = new_view;
722 		}
723 		if (focus_view) {
724 			show_panel(focus_view->panel);
725 			if (view)
726 				view->focussed = 0;
727 			focus_view->focussed = 1;
728 			view = focus_view;
729 			if (new_view)
730 				show_panel(new_view->panel);
731 			if (view->child && view_is_splitscreen(view->child))
732 				show_panel(view->child->panel);
733 		}
734 		if (view) {
735 			if (focus_view == NULL) {
736 				view->focussed = 1;
737 				show_panel(view->panel);
738 				if (view->child && view_is_splitscreen(view->child))
739 					show_panel(view->child->panel);
740 				focus_view = view;
741 			}
742 			if (view->parent) {
743 				err = view->parent->show(view->parent);
744 				if (err)
745 					goto done;
746 			}
747 			err = view->show(view);
748 			if (err)
749 				goto done;
750 			if (view->child) {
751 				err = view->child->show(view->child);
752 				if (err)
753 					goto done;
754 			}
755 			update_panels();
756 			doupdate();
757 		}
758 	}
759 done:
760 	while (!TAILQ_EMPTY(&views)) {
761 		view = TAILQ_FIRST(&views);
762 		TAILQ_REMOVE(&views, view, entry);
763 		view_close(view);
764 	}
765 
766 	errcode = pthread_mutex_unlock(&tog_mutex);
767 	if (errcode)
768 		return got_error_set_errno(errcode, "pthread_mutex_unlock");
769 
770 	return err;
771 }
772 
773 __dead static void
774 usage_log(void)
775 {
776 	endwin();
777 	fprintf(stderr,
778 	    "usage: %s log [-c commit] [-r repository-path] [path]\n",
779 	    getprogname());
780 	exit(1);
781 }
782 
783 /* Create newly allocated wide-character string equivalent to a byte string. */
784 static const struct got_error *
785 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
786 {
787 	char *vis = NULL;
788 	const struct got_error *err = NULL;
789 
790 	*ws = NULL;
791 	*wlen = mbstowcs(NULL, s, 0);
792 	if (*wlen == (size_t)-1) {
793 		int vislen;
794 		if (errno != EILSEQ)
795 			return got_error_from_errno("mbstowcs");
796 
797 		/* byte string invalid in current encoding; try to "fix" it */
798 		err = got_mbsavis(&vis, &vislen, s);
799 		if (err)
800 			return err;
801 		*wlen = mbstowcs(NULL, vis, 0);
802 		if (*wlen == (size_t)-1) {
803 			err = got_error_from_errno("mbstowcs"); /* give up */
804 			goto done;
805 		}
806 	}
807 
808 	*ws = calloc(*wlen + 1, sizeof(*ws));
809 	if (*ws == NULL) {
810 		err = got_error_from_errno("calloc");
811 		goto done;
812 	}
813 
814 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
815 		err = got_error_from_errno("mbstowcs");
816 done:
817 	free(vis);
818 	if (err) {
819 		free(*ws);
820 		*ws = NULL;
821 		*wlen = 0;
822 	}
823 	return err;
824 }
825 
826 /* Format a line for display, ensuring that it won't overflow a width limit. */
827 static const struct got_error *
828 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
829 {
830 	const struct got_error *err = NULL;
831 	int cols = 0;
832 	wchar_t *wline = NULL;
833 	size_t wlen;
834 	int i;
835 
836 	*wlinep = NULL;
837 	*widthp = 0;
838 
839 	err = mbs2ws(&wline, &wlen, line);
840 	if (err)
841 		return err;
842 
843 	i = 0;
844 	while (i < wlen && cols < wlimit) {
845 		int width = wcwidth(wline[i]);
846 		switch (width) {
847 		case 0:
848 			i++;
849 			break;
850 		case 1:
851 		case 2:
852 			if (cols + width <= wlimit)
853 				cols += width;
854 			i++;
855 			break;
856 		case -1:
857 			if (wline[i] == L'\t')
858 				cols += TABSIZE - ((cols + 1) % TABSIZE);
859 			i++;
860 			break;
861 		default:
862 			err = got_error_from_errno("wcwidth");
863 			goto done;
864 		}
865 	}
866 	wline[i] = L'\0';
867 	if (widthp)
868 		*widthp = cols;
869 done:
870 	if (err)
871 		free(wline);
872 	else
873 		*wlinep = wline;
874 	return err;
875 }
876 
877 static const struct got_error*
878 build_refs_str(char **refs_str, struct got_reflist_head *refs,
879     struct got_object_id *id)
880 {
881 	static const struct got_error *err = NULL;
882 	struct got_reflist_entry *re;
883 	char *s;
884 	const char *name;
885 
886 	*refs_str = NULL;
887 
888 	SIMPLEQ_FOREACH(re, refs, entry) {
889 		if (got_object_id_cmp(re->id, id) != 0)
890 			continue;
891 		name = got_ref_get_name(re->ref);
892 		if (strcmp(name, GOT_REF_HEAD) == 0)
893 			continue;
894 		if (strncmp(name, "refs/", 5) == 0)
895 			name += 5;
896 		if (strncmp(name, "got/", 4) == 0)
897 			continue;
898 		if (strncmp(name, "heads/", 6) == 0)
899 			name += 6;
900 		if (strncmp(name, "remotes/", 8) == 0)
901 			name += 8;
902 		s = *refs_str;
903 		if (asprintf(refs_str, "%s%s%s", s ? s : "",
904 		    s ? ", " : "", name) == -1) {
905 			err = got_error_from_errno("asprintf");
906 			free(s);
907 			*refs_str = NULL;
908 			break;
909 		}
910 		free(s);
911 	}
912 
913 	return err;
914 }
915 
916 static const struct got_error *
917 format_author(wchar_t **wauthor, int *author_width, char *author, int limit)
918 {
919 	char *smallerthan, *at;
920 
921 	smallerthan = strchr(author, '<');
922 	if (smallerthan && smallerthan[1] != '\0')
923 		author = smallerthan + 1;
924 	at = strchr(author, '@');
925 	if (at)
926 		*at = '\0';
927 	return format_line(wauthor, author_width, author, limit);
928 }
929 
930 static const struct got_error *
931 draw_commit(struct tog_view *view, struct got_commit_object *commit,
932     struct got_object_id *id, struct got_reflist_head *refs,
933     int author_display_cols)
934 {
935 	const struct got_error *err = NULL;
936 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
937 	char *logmsg0 = NULL, *logmsg = NULL;
938 	char *author = NULL;
939 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
940 	int author_width, logmsg_width;
941 	char *newline, *line = NULL;
942 	int col, limit;
943 	static const size_t date_display_cols = 9;
944 	const int avail = view->ncols;
945 	struct tm tm;
946 	time_t committer_time;
947 
948 	committer_time = got_object_commit_get_committer_time(commit);
949 	if (localtime_r(&committer_time, &tm) == NULL)
950 		return got_error_from_errno("localtime_r");
951 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ", &tm)
952 	    >= sizeof(datebuf))
953 		return got_error(GOT_ERR_NO_SPACE);
954 
955 	if (avail < date_display_cols)
956 		limit = MIN(sizeof(datebuf) - 1, avail);
957 	else
958 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
959 	waddnstr(view->window, datebuf, limit);
960 	col = limit + 1;
961 	if (col > avail)
962 		goto done;
963 
964 	author = strdup(got_object_commit_get_author(commit));
965 	if (author == NULL) {
966 		err = got_error_from_errno("strdup");
967 		goto done;
968 	}
969 	err = format_author(&wauthor, &author_width, author, avail - col);
970 	if (err)
971 		goto done;
972 	waddwstr(view->window, wauthor);
973 	col += author_width;
974 	while (col <= avail && author_width < author_display_cols + 2) {
975 		waddch(view->window, ' ');
976 		col++;
977 		author_width++;
978 	}
979 	if (col > avail)
980 		goto done;
981 
982 	logmsg0 = strdup(got_object_commit_get_logmsg(commit));
983 	if (logmsg0 == NULL) {
984 		err = got_error_from_errno("strdup");
985 		goto done;
986 	}
987 	logmsg = logmsg0;
988 	while (*logmsg == '\n')
989 		logmsg++;
990 	newline = strchr(logmsg, '\n');
991 	if (newline)
992 		*newline = '\0';
993 	limit = avail - col;
994 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
995 	if (err)
996 		goto done;
997 	waddwstr(view->window, wlogmsg);
998 	col += logmsg_width;
999 	while (col <= avail) {
1000 		waddch(view->window, ' ');
1001 		col++;
1002 	}
1003 done:
1004 	free(logmsg0);
1005 	free(wlogmsg);
1006 	free(author);
1007 	free(wauthor);
1008 	free(line);
1009 	return err;
1010 }
1011 
1012 static struct commit_queue_entry *
1013 alloc_commit_queue_entry(struct got_commit_object *commit,
1014     struct got_object_id *id)
1015 {
1016 	struct commit_queue_entry *entry;
1017 
1018 	entry = calloc(1, sizeof(*entry));
1019 	if (entry == NULL)
1020 		return NULL;
1021 
1022 	entry->id = id;
1023 	entry->commit = commit;
1024 	return entry;
1025 }
1026 
1027 static void
1028 pop_commit(struct commit_queue *commits)
1029 {
1030 	struct commit_queue_entry *entry;
1031 
1032 	entry = TAILQ_FIRST(&commits->head);
1033 	TAILQ_REMOVE(&commits->head, entry, entry);
1034 	got_object_commit_close(entry->commit);
1035 	commits->ncommits--;
1036 	/* Don't free entry->id! It is owned by the commit graph. */
1037 	free(entry);
1038 }
1039 
1040 static void
1041 free_commits(struct commit_queue *commits)
1042 {
1043 	while (!TAILQ_EMPTY(&commits->head))
1044 		pop_commit(commits);
1045 }
1046 
1047 static const struct got_error *
1048 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
1049     int minqueue, struct got_repository *repo, const char *path)
1050 {
1051 	const struct got_error *err = NULL;
1052 	int nqueued = 0;
1053 
1054 	/*
1055 	 * We keep all commits open throughout the lifetime of the log
1056 	 * view in order to avoid having to re-fetch commits from disk
1057 	 * while updating the display.
1058 	 */
1059 	while (nqueued < minqueue) {
1060 		struct got_object_id *id;
1061 		struct got_commit_object *commit;
1062 		struct commit_queue_entry *entry;
1063 		int errcode;
1064 
1065 		err = got_commit_graph_iter_next(&id, graph);
1066 		if (err) {
1067 			if (err->code != GOT_ERR_ITER_NEED_MORE)
1068 				break;
1069 			err = got_commit_graph_fetch_commits(graph,
1070 			    minqueue, repo);
1071 			if (err)
1072 				return err;
1073 			continue;
1074 		}
1075 
1076 		if (id == NULL)
1077 			break;
1078 
1079 		err = got_object_open_as_commit(&commit, repo, id);
1080 		if (err)
1081 			break;
1082 		entry = alloc_commit_queue_entry(commit, id);
1083 		if (entry == NULL) {
1084 			err = got_error_from_errno("alloc_commit_queue_entry");
1085 			break;
1086 		}
1087 
1088 		errcode = pthread_mutex_lock(&tog_mutex);
1089 		if (errcode) {
1090 			err = got_error_set_errno(errcode, "pthread_mutex_lock");
1091 			break;
1092 		}
1093 
1094 		entry->idx = commits->ncommits;
1095 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
1096 		nqueued++;
1097 		commits->ncommits++;
1098 
1099 		errcode = pthread_mutex_unlock(&tog_mutex);
1100 		if (errcode && err == NULL)
1101 			err = got_error_set_errno(errcode,
1102 			    "pthread_mutex_unlock");
1103 	}
1104 
1105 	return err;
1106 }
1107 
1108 static const struct got_error *
1109 get_head_commit_id(struct got_object_id **head_id, const char *branch_name,
1110     struct got_repository *repo)
1111 {
1112 	const struct got_error *err = NULL;
1113 	struct got_reference *head_ref;
1114 
1115 	*head_id = NULL;
1116 
1117 	err = got_ref_open(&head_ref, repo, branch_name, 0);
1118 	if (err)
1119 		return err;
1120 
1121 	err = got_ref_resolve(head_id, repo, head_ref);
1122 	got_ref_close(head_ref);
1123 	if (err) {
1124 		*head_id = NULL;
1125 		return err;
1126 	}
1127 
1128 	return NULL;
1129 }
1130 
1131 static const struct got_error *
1132 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1133     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1134     struct commit_queue *commits, int selected_idx, int limit,
1135     struct got_reflist_head *refs, const char *path, int commits_needed)
1136 {
1137 	const struct got_error *err = NULL;
1138 	struct commit_queue_entry *entry;
1139 	int ncommits, width;
1140 	int author_cols = 10;
1141 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1142 	char *refs_str = NULL;
1143 	wchar_t *wline;
1144 
1145 	entry = first;
1146 	ncommits = 0;
1147 	while (entry) {
1148 		if (ncommits == selected_idx) {
1149 			*selected = entry;
1150 			break;
1151 		}
1152 		entry = TAILQ_NEXT(entry, entry);
1153 		ncommits++;
1154 	}
1155 
1156 	if (*selected) {
1157 		err = got_object_id_str(&id_str, (*selected)->id);
1158 		if (err)
1159 			return err;
1160 		if (refs) {
1161 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1162 			if (err)
1163 				goto done;
1164 		}
1165 	}
1166 
1167 	if (commits_needed == 0)
1168 		halfdelay(10); /* disable fast refresh */
1169 
1170 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1171 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1172 	    commits_needed > 0 ? "loading... " :
1173 	    (refs_str ? refs_str : "")) == -1) {
1174 		err = got_error_from_errno("asprintf");
1175 		goto done;
1176 	}
1177 
1178 	if (path && strcmp(path, "/") != 0) {
1179 		if (asprintf(&header, "commit %s %s%s",
1180 		    id_str ? id_str : "........................................",
1181 		    path, ncommits_str) == -1) {
1182 			err = got_error_from_errno("asprintf");
1183 			header = NULL;
1184 			goto done;
1185 		}
1186 	} else if (asprintf(&header, "commit %s%s",
1187 	    id_str ? id_str : "........................................",
1188 	    ncommits_str) == -1) {
1189 		err = got_error_from_errno("asprintf");
1190 		header = NULL;
1191 		goto done;
1192 	}
1193 	err = format_line(&wline, &width, header, view->ncols);
1194 	if (err)
1195 		goto done;
1196 
1197 	werase(view->window);
1198 
1199 	if (view_needs_focus_indication(view))
1200 		wstandout(view->window);
1201 	waddwstr(view->window, wline);
1202 	while (width < view->ncols) {
1203 		waddch(view->window, ' ');
1204 		width++;
1205 	}
1206 	if (view_needs_focus_indication(view))
1207 		wstandend(view->window);
1208 	free(wline);
1209 	if (limit <= 1)
1210 		goto done;
1211 
1212 	/* Grow author column size if necessary. */
1213 	entry = first;
1214 	ncommits = 0;
1215 	while (entry) {
1216 		char *author;
1217 		wchar_t *wauthor;
1218 		int width;
1219 		if (ncommits >= limit - 1)
1220 			break;
1221 		author = strdup(got_object_commit_get_author(entry->commit));
1222 		if (author == NULL) {
1223 			err = got_error_from_errno("strdup");
1224 			goto done;
1225 		}
1226 		err = format_author(&wauthor, &width, author, COLS);
1227 		if (author_cols < width)
1228 			author_cols = width;
1229 		free(wauthor);
1230 		free(author);
1231 		entry = TAILQ_NEXT(entry, entry);
1232 	}
1233 
1234 	entry = first;
1235 	*last = first;
1236 	ncommits = 0;
1237 	while (entry) {
1238 		if (ncommits >= limit - 1)
1239 			break;
1240 		if (ncommits == selected_idx)
1241 			wstandout(view->window);
1242 		err = draw_commit(view, entry->commit, entry->id, refs,
1243 		    author_cols);
1244 		if (ncommits == selected_idx)
1245 			wstandend(view->window);
1246 		if (err)
1247 			break;
1248 		ncommits++;
1249 		*last = entry;
1250 		entry = TAILQ_NEXT(entry, entry);
1251 	}
1252 
1253 	view_vborder(view);
1254 done:
1255 	free(id_str);
1256 	free(refs_str);
1257 	free(ncommits_str);
1258 	free(header);
1259 	return err;
1260 }
1261 
1262 static void
1263 scroll_up(struct tog_view *view,
1264     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1265     struct commit_queue *commits)
1266 {
1267 	struct commit_queue_entry *entry;
1268 	int nscrolled = 0;
1269 
1270 	entry = TAILQ_FIRST(&commits->head);
1271 	if (*first_displayed_entry == entry)
1272 		return;
1273 
1274 	entry = *first_displayed_entry;
1275 	while (entry && nscrolled < maxscroll) {
1276 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1277 		if (entry) {
1278 			*first_displayed_entry = entry;
1279 			nscrolled++;
1280 		}
1281 	}
1282 }
1283 
1284 static const struct got_error *
1285 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1286     pthread_cond_t *need_commits)
1287 {
1288 	int errcode;
1289 	int max_wait = 20;
1290 
1291 	halfdelay(1); /* fast refresh while loading commits */
1292 
1293 	while (*commits_needed > 0) {
1294 		if (*log_complete)
1295 			break;
1296 
1297 		/* Wake the log thread. */
1298 		errcode = pthread_cond_signal(need_commits);
1299 		if (errcode)
1300 			return got_error_set_errno(errcode,
1301 			    "pthread_cond_signal");
1302 		errcode = pthread_mutex_unlock(&tog_mutex);
1303 		if (errcode)
1304 			return got_error_set_errno(errcode,
1305 			    "pthread_mutex_unlock");
1306 		pthread_yield();
1307 		errcode = pthread_mutex_lock(&tog_mutex);
1308 		if (errcode)
1309 			return got_error_set_errno(errcode,
1310 			    "pthread_mutex_lock");
1311 
1312 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1313 			/*
1314 			 * Thread is not done yet; lose a key press
1315 			 * and let the user retry... this way the GUI
1316 			 * remains interactive while logging deep paths
1317 			 * with few commits in history.
1318 			 */
1319 			return NULL;
1320 		}
1321 	}
1322 
1323 	return NULL;
1324 }
1325 
1326 static const struct got_error *
1327 scroll_down(struct tog_view *view,
1328     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1329     struct commit_queue_entry **last_displayed_entry,
1330     struct commit_queue *commits, int *log_complete, int *commits_needed,
1331     pthread_cond_t *need_commits)
1332 {
1333 	const struct got_error *err = NULL;
1334 	struct commit_queue_entry *pentry;
1335 	int nscrolled = 0;
1336 
1337 	if (*last_displayed_entry == NULL)
1338 		return NULL;
1339 
1340 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1341 	if (pentry == NULL && !*log_complete) {
1342 		/*
1343 		 * Ask the log thread for required amount of commits
1344 		 * plus some amount of pre-fetching.
1345 		 */
1346 		(*commits_needed) += maxscroll + 20;
1347 		err = trigger_log_thread(0, commits_needed, log_complete,
1348 		    need_commits);
1349 		if (err)
1350 			return err;
1351 	}
1352 
1353 	do {
1354 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1355 		if (pentry == NULL)
1356 			break;
1357 
1358 		*last_displayed_entry = pentry;
1359 
1360 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1361 		if (pentry == NULL)
1362 			break;
1363 		*first_displayed_entry = pentry;
1364 	} while (++nscrolled < maxscroll);
1365 
1366 	return err;
1367 }
1368 
1369 static const struct got_error *
1370 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1371     struct got_commit_object *commit, struct got_object_id *commit_id,
1372     struct tog_view *log_view, struct got_reflist_head *refs,
1373     struct got_repository *repo)
1374 {
1375 	const struct got_error *err;
1376 	struct got_object_qid *parent_id;
1377 	struct tog_view *diff_view;
1378 
1379 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1380 	if (diff_view == NULL)
1381 		return got_error_from_errno("view_open");
1382 
1383 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1384 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1385 	    commit_id, log_view, refs, repo);
1386 	if (err == NULL)
1387 		*new_view = diff_view;
1388 	return err;
1389 }
1390 
1391 static const struct got_error *
1392 browse_commit(struct tog_view **new_view, int begin_x,
1393     struct commit_queue_entry *entry, struct got_reflist_head *refs,
1394     struct got_repository *repo)
1395 {
1396 	const struct got_error *err = NULL;
1397 	struct got_tree_object *tree;
1398 	struct tog_view *tree_view;
1399 
1400 	err = got_object_open_as_tree(&tree, repo,
1401 	    got_object_commit_get_tree_id(entry->commit));
1402 	if (err)
1403 		return err;
1404 
1405 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1406 	if (tree_view == NULL)
1407 		return got_error_from_errno("view_open");
1408 
1409 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1410 	if (err)
1411 		got_object_tree_close(tree);
1412 	else
1413 		*new_view = tree_view;
1414 	return err;
1415 }
1416 
1417 static void *
1418 log_thread(void *arg)
1419 {
1420 	const struct got_error *err = NULL;
1421 	int errcode = 0;
1422 	struct tog_log_thread_args *a = arg;
1423 	int done = 0;
1424 
1425 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1426 	if (err)
1427 		return (void *)err;
1428 
1429 	while (!done && !err) {
1430 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1431 		    a->in_repo_path);
1432 		if (err) {
1433 			if (err->code != GOT_ERR_ITER_COMPLETED)
1434 				return (void *)err;
1435 			err = NULL;
1436 			done = 1;
1437 		} else if (a->commits_needed > 0)
1438 			a->commits_needed--;
1439 
1440 		errcode = pthread_mutex_lock(&tog_mutex);
1441 		if (errcode) {
1442 			err = got_error_set_errno(errcode,
1443 			    "pthread_mutex_lock");
1444 			break;
1445 		} else if (*a->quit)
1446 			done = 1;
1447 		else if (*a->first_displayed_entry == NULL) {
1448 			*a->first_displayed_entry =
1449 			    TAILQ_FIRST(&a->commits->head);
1450 			*a->selected_entry = *a->first_displayed_entry;
1451 		}
1452 
1453 		if (done)
1454 			a->commits_needed = 0;
1455 		else if (a->commits_needed == 0) {
1456 			errcode = pthread_cond_wait(&a->need_commits,
1457 			    &tog_mutex);
1458 			if (errcode)
1459 				err = got_error_set_errno(errcode,
1460 				    "pthread_cond_wait");
1461 		}
1462 
1463 		errcode = pthread_mutex_unlock(&tog_mutex);
1464 		if (errcode && err == NULL)
1465 			err = got_error_set_errno(errcode,
1466 			    "pthread_mutex_unlock");
1467 	}
1468 	a->log_complete = 1;
1469 	return (void *)err;
1470 }
1471 
1472 static const struct got_error *
1473 stop_log_thread(struct tog_log_view_state *s)
1474 {
1475 	const struct got_error *err = NULL;
1476 	int errcode;
1477 
1478 	if (s->thread) {
1479 		s->quit = 1;
1480 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1481 		if (errcode)
1482 			return got_error_set_errno(errcode,
1483 			    "pthread_cond_signal");
1484 		errcode = pthread_mutex_unlock(&tog_mutex);
1485 		if (errcode)
1486 			return got_error_set_errno(errcode,
1487 			    "pthread_mutex_unlock");
1488 		errcode = pthread_join(s->thread, (void **)&err);
1489 		if (errcode)
1490 			return got_error_set_errno(errcode, "pthread_join");
1491 		errcode = pthread_mutex_lock(&tog_mutex);
1492 		if (errcode)
1493 			return got_error_set_errno(errcode,
1494 			    "pthread_mutex_lock");
1495 		s->thread = NULL;
1496 	}
1497 
1498 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1499 	if (errcode && err == NULL)
1500 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
1501 
1502 	if (s->thread_args.repo) {
1503 		got_repo_close(s->thread_args.repo);
1504 		s->thread_args.repo = NULL;
1505 	}
1506 
1507 	if (s->thread_args.graph) {
1508 		got_commit_graph_close(s->thread_args.graph);
1509 		s->thread_args.graph = NULL;
1510 	}
1511 
1512 	return err;
1513 }
1514 
1515 static const struct got_error *
1516 close_log_view(struct tog_view *view)
1517 {
1518 	const struct got_error *err = NULL;
1519 	struct tog_log_view_state *s = &view->state.log;
1520 
1521 	err = stop_log_thread(s);
1522 	free_commits(&s->commits);
1523 	free(s->in_repo_path);
1524 	s->in_repo_path = NULL;
1525 	free(s->start_id);
1526 	s->start_id = NULL;
1527 	return err;
1528 }
1529 
1530 static const struct got_error *
1531 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1532     struct got_reflist_head *refs, struct got_repository *repo,
1533     const char *path, int check_disk)
1534 {
1535 	const struct got_error *err = NULL;
1536 	struct tog_log_view_state *s = &view->state.log;
1537 	struct got_repository *thread_repo = NULL;
1538 	struct got_commit_graph *thread_graph = NULL;
1539 	int errcode;
1540 
1541 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1542 	if (err != NULL)
1543 		goto done;
1544 
1545 	/* The commit queue only contains commits being displayed. */
1546 	TAILQ_INIT(&s->commits.head);
1547 	s->commits.ncommits = 0;
1548 
1549 	s->refs = refs;
1550 	s->repo = repo;
1551 	s->start_id = got_object_id_dup(start_id);
1552 	if (s->start_id == NULL) {
1553 		err = got_error_from_errno("got_object_id_dup");
1554 		goto done;
1555 	}
1556 
1557 	view->show = show_log_view;
1558 	view->input = input_log_view;
1559 	view->close = close_log_view;
1560 
1561 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1562 	if (err)
1563 		goto done;
1564 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1565 	    0, thread_repo);
1566 	if (err)
1567 		goto done;
1568 
1569 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1570 	if (errcode) {
1571 		err = got_error_set_errno(errcode, "pthread_cond_init");
1572 		goto done;
1573 	}
1574 
1575 	s->thread_args.commits_needed = view->nlines;
1576 	s->thread_args.graph = thread_graph;
1577 	s->thread_args.commits = &s->commits;
1578 	s->thread_args.in_repo_path = s->in_repo_path;
1579 	s->thread_args.start_id = s->start_id;
1580 	s->thread_args.repo = thread_repo;
1581 	s->thread_args.log_complete = 0;
1582 	s->thread_args.quit = &s->quit;
1583 	s->thread_args.view = view;
1584 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1585 	s->thread_args.selected_entry = &s->selected_entry;
1586 done:
1587 	if (err)
1588 		close_log_view(view);
1589 	return err;
1590 }
1591 
1592 static const struct got_error *
1593 show_log_view(struct tog_view *view)
1594 {
1595 	struct tog_log_view_state *s = &view->state.log;
1596 
1597 	if (s->thread == NULL) {
1598 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1599 		    &s->thread_args);
1600 		if (errcode)
1601 			return got_error_set_errno(errcode, "pthread_create");
1602 	}
1603 
1604 	return draw_commits(view, &s->last_displayed_entry,
1605 	    &s->selected_entry, s->first_displayed_entry,
1606 	    &s->commits, s->selected, view->nlines, s->refs,
1607 	    s->in_repo_path, s->thread_args.commits_needed);
1608 }
1609 
1610 static const struct got_error *
1611 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1612     struct tog_view **focus_view, struct tog_view *view, int ch)
1613 {
1614 	const struct got_error *err = NULL;
1615 	struct tog_log_view_state *s = &view->state.log;
1616 	char *parent_path;
1617 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1618 	int begin_x = 0;
1619 
1620 	switch (ch) {
1621 	case 'q':
1622 		s->quit = 1;
1623 		break;
1624 	case 'k':
1625 	case KEY_UP:
1626 	case '<':
1627 	case ',':
1628 		if (s->first_displayed_entry == NULL)
1629 			break;
1630 		if (s->selected > 0)
1631 			s->selected--;
1632 		if (s->selected > 0)
1633 			break;
1634 		scroll_up(view, &s->first_displayed_entry, 1,
1635 		    &s->commits);
1636 		break;
1637 	case KEY_PPAGE:
1638 	case CTRL('b'):
1639 		if (s->first_displayed_entry == NULL)
1640 			break;
1641 		if (TAILQ_FIRST(&s->commits.head) ==
1642 		    s->first_displayed_entry) {
1643 			s->selected = 0;
1644 			break;
1645 		}
1646 		scroll_up(view, &s->first_displayed_entry,
1647 		    view->nlines, &s->commits);
1648 		break;
1649 	case 'j':
1650 	case KEY_DOWN:
1651 	case '>':
1652 	case '.':
1653 		if (s->first_displayed_entry == NULL)
1654 			break;
1655 		if (s->selected < MIN(view->nlines - 2,
1656 		    s->commits.ncommits - 1)) {
1657 			s->selected++;
1658 			break;
1659 		}
1660 		err = scroll_down(view, &s->first_displayed_entry, 1,
1661 		    &s->last_displayed_entry, &s->commits,
1662 		    &s->thread_args.log_complete,
1663 		    &s->thread_args.commits_needed,
1664 		    &s->thread_args.need_commits);
1665 		break;
1666 	case KEY_NPAGE:
1667 	case CTRL('f'): {
1668 		struct commit_queue_entry *first;
1669 		first = s->first_displayed_entry;
1670 		if (first == NULL)
1671 			break;
1672 		err = scroll_down(view, &s->first_displayed_entry,
1673 		    view->nlines, &s->last_displayed_entry,
1674 		    &s->commits, &s->thread_args.log_complete,
1675 		    &s->thread_args.commits_needed,
1676 		    &s->thread_args.need_commits);
1677 		if (first == s->first_displayed_entry &&
1678 		    s->selected < MIN(view->nlines - 2,
1679 		    s->commits.ncommits - 1)) {
1680 			/* can't scroll further down */
1681 			s->selected = MIN(view->nlines - 2,
1682 			    s->commits.ncommits - 1);
1683 		}
1684 		err = NULL;
1685 		break;
1686 	}
1687 	case KEY_RESIZE:
1688 		if (s->selected > view->nlines - 2)
1689 			s->selected = view->nlines - 2;
1690 		if (s->selected > s->commits.ncommits - 1)
1691 			s->selected = s->commits.ncommits - 1;
1692 		break;
1693 	case KEY_ENTER:
1694 	case ' ':
1695 	case '\r':
1696 		if (s->selected_entry == NULL)
1697 			break;
1698 		if (view_is_parent_view(view))
1699 			begin_x = view_split_begin_x(view->begin_x);
1700 		err = open_diff_view_for_commit(&diff_view, begin_x,
1701 		    s->selected_entry->commit, s->selected_entry->id,
1702 		    view, s->refs, s->repo);
1703 		if (err)
1704 			break;
1705 		if (view_is_parent_view(view)) {
1706 			err = view_close_child(view);
1707 			if (err)
1708 				return err;
1709 			err = view_set_child(view, diff_view);
1710 			if (err) {
1711 				view_close(diff_view);
1712 				break;
1713 			}
1714 			*focus_view = diff_view;
1715 			view->child_focussed = 1;
1716 		} else
1717 			*new_view = diff_view;
1718 		break;
1719 	case 't':
1720 		if (s->selected_entry == NULL)
1721 			break;
1722 		if (view_is_parent_view(view))
1723 			begin_x = view_split_begin_x(view->begin_x);
1724 		err = browse_commit(&tree_view, begin_x,
1725 		    s->selected_entry, s->refs, s->repo);
1726 		if (err)
1727 			break;
1728 		if (view_is_parent_view(view)) {
1729 			err = view_close_child(view);
1730 			if (err)
1731 				return err;
1732 			err = view_set_child(view, tree_view);
1733 			if (err) {
1734 				view_close(tree_view);
1735 				break;
1736 			}
1737 			*focus_view = tree_view;
1738 			view->child_focussed = 1;
1739 		} else
1740 			*new_view = tree_view;
1741 		break;
1742 	case KEY_BACKSPACE:
1743 		if (strcmp(s->in_repo_path, "/") == 0)
1744 			break;
1745 		parent_path = dirname(s->in_repo_path);
1746 		if (parent_path && strcmp(parent_path, ".") != 0) {
1747 			struct tog_view *lv;
1748 			err = stop_log_thread(s);
1749 			if (err)
1750 				return err;
1751 			lv = view_open(view->nlines, view->ncols,
1752 			    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1753 			if (lv == NULL)
1754 				return got_error_from_errno(
1755 				    "view_open");
1756 			err = open_log_view(lv, s->start_id, s->refs,
1757 			    s->repo, parent_path, 0);
1758 			if (err)
1759 				return err;;
1760 			if (view_is_parent_view(view))
1761 				*new_view = lv;
1762 			else {
1763 				view_set_child(view->parent, lv);
1764 				*focus_view = lv;
1765 			}
1766 			return NULL;
1767 		}
1768 		break;
1769 	default:
1770 		break;
1771 	}
1772 
1773 	return err;
1774 }
1775 
1776 static const struct got_error *
1777 apply_unveil(const char *repo_path, const char *worktree_path)
1778 {
1779 	const struct got_error *error;
1780 
1781 	if (repo_path && unveil(repo_path, "r") != 0)
1782 		return got_error_from_errno2("unveil", repo_path);
1783 
1784 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1785 		return got_error_from_errno2("unveil", worktree_path);
1786 
1787 	if (unveil("/tmp", "rwc") != 0)
1788 		return got_error_from_errno2("unveil", "/tmp");
1789 
1790 	error = got_privsep_unveil_exec_helpers();
1791 	if (error != NULL)
1792 		return error;
1793 
1794 	if (unveil(NULL, NULL) != 0)
1795 		return got_error_from_errno("unveil");
1796 
1797 	return NULL;
1798 }
1799 
1800 static void
1801 init_curses(void)
1802 {
1803 	initscr();
1804 	cbreak();
1805 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1806 	noecho();
1807 	nonl();
1808 	intrflush(stdscr, FALSE);
1809 	keypad(stdscr, TRUE);
1810 	curs_set(0);
1811 	signal(SIGWINCH, tog_sigwinch);
1812 }
1813 
1814 static const struct got_error *
1815 cmd_log(int argc, char *argv[])
1816 {
1817 	const struct got_error *error;
1818 	struct got_repository *repo = NULL;
1819 	struct got_worktree *worktree = NULL;
1820 	struct got_reflist_head refs;
1821 	struct got_object_id *start_id = NULL;
1822 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1823 	char *start_commit = NULL;
1824 	int ch;
1825 	struct tog_view *view;
1826 
1827 	SIMPLEQ_INIT(&refs);
1828 
1829 #ifndef PROFILE
1830 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1831 	    NULL) == -1)
1832 		err(1, "pledge");
1833 #endif
1834 
1835 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1836 		switch (ch) {
1837 		case 'c':
1838 			start_commit = optarg;
1839 			break;
1840 		case 'r':
1841 			repo_path = realpath(optarg, NULL);
1842 			if (repo_path == NULL)
1843 				err(1, "-r option");
1844 			break;
1845 		default:
1846 			usage_log();
1847 			/* NOTREACHED */
1848 		}
1849 	}
1850 
1851 	argc -= optind;
1852 	argv += optind;
1853 
1854 	cwd = getcwd(NULL, 0);
1855 	if (cwd == NULL) {
1856 		error = got_error_from_errno("getcwd");
1857 		goto done;
1858 	}
1859 	error = got_worktree_open(&worktree, cwd);
1860 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
1861 		goto done;
1862 	error = NULL;
1863 
1864 	if (argc == 0) {
1865 		path = strdup("");
1866 		if (path == NULL) {
1867 			error = got_error_from_errno("strdup");
1868 			goto done;
1869 		}
1870 	} else if (argc == 1) {
1871 		if (worktree) {
1872 			error = got_worktree_resolve_path(&path, worktree,
1873 			    argv[0]);
1874 			if (error)
1875 				goto done;
1876 		} else {
1877 			path = strdup(argv[0]);
1878 			if (path == NULL) {
1879 				error = got_error_from_errno("strdup");
1880 				goto done;
1881 			}
1882 		}
1883 	} else
1884 		usage_log();
1885 
1886 	repo_path = worktree ?
1887 	    strdup(got_worktree_get_repo_path(worktree)) : strdup(cwd);
1888 	if (repo_path == NULL) {
1889 		error = got_error_from_errno("strdup");
1890 		goto done;
1891 	}
1892 
1893 	init_curses();
1894 
1895 	error = got_repo_open(&repo, repo_path);
1896 	if (error != NULL)
1897 		goto done;
1898 
1899 	error = apply_unveil(got_repo_get_path(repo),
1900 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1901 	if (error)
1902 		goto done;
1903 
1904 	if (start_commit == NULL)
1905 		error = get_head_commit_id(&start_id, worktree ?
1906 		    got_worktree_get_head_ref_name(worktree) : GOT_REF_HEAD,
1907 		    repo);
1908 	else
1909 		error = got_object_resolve_id_str(&start_id, repo,
1910 		    start_commit);
1911 	if (error != NULL)
1912 		goto done;
1913 
1914 	error = got_ref_list(&refs, repo);
1915 	if (error)
1916 		goto done;
1917 
1918 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1919 	if (view == NULL) {
1920 		error = got_error_from_errno("view_open");
1921 		goto done;
1922 	}
1923 	error = open_log_view(view, start_id, &refs, repo, path, 1);
1924 	if (error)
1925 		goto done;
1926 	error = view_loop(view);
1927 done:
1928 	free(repo_path);
1929 	free(cwd);
1930 	free(path);
1931 	free(start_id);
1932 	if (repo)
1933 		got_repo_close(repo);
1934 	if (worktree)
1935 		got_worktree_close(worktree);
1936 	got_ref_list_free(&refs);
1937 	return error;
1938 }
1939 
1940 __dead static void
1941 usage_diff(void)
1942 {
1943 	endwin();
1944 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1945 	    getprogname());
1946 	exit(1);
1947 }
1948 
1949 static char *
1950 parse_next_line(FILE *f, size_t *len)
1951 {
1952 	char *line;
1953 	size_t linelen;
1954 	size_t lineno;
1955 	const char delim[3] = { '\0', '\0', '\0'};
1956 
1957 	line = fparseln(f, &linelen, &lineno, delim, 0);
1958 	if (len)
1959 		*len = linelen;
1960 	return line;
1961 }
1962 
1963 static const struct got_error *
1964 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1965     int *last_displayed_line, int *eof, int max_lines,
1966     char *header)
1967 {
1968 	const struct got_error *err;
1969 	int nlines = 0, nprinted = 0;
1970 	char *line;
1971 	size_t len;
1972 	wchar_t *wline;
1973 	int width;
1974 
1975 	rewind(f);
1976 	werase(view->window);
1977 
1978 	if (header) {
1979 		err = format_line(&wline, &width, header, view->ncols);
1980 		if (err) {
1981 			return err;
1982 		}
1983 
1984 		if (view_needs_focus_indication(view))
1985 			wstandout(view->window);
1986 		waddwstr(view->window, wline);
1987 		if (view_needs_focus_indication(view))
1988 			wstandend(view->window);
1989 		if (width < view->ncols)
1990 			waddch(view->window, '\n');
1991 
1992 		if (max_lines <= 1)
1993 			return NULL;
1994 		max_lines--;
1995 	}
1996 
1997 	*eof = 0;
1998 	while (nprinted < max_lines) {
1999 		line = parse_next_line(f, &len);
2000 		if (line == NULL) {
2001 			*eof = 1;
2002 			break;
2003 		}
2004 		if (++nlines < *first_displayed_line) {
2005 			free(line);
2006 			continue;
2007 		}
2008 
2009 		err = format_line(&wline, &width, line, view->ncols);
2010 		if (err) {
2011 			free(line);
2012 			return err;
2013 		}
2014 		waddwstr(view->window, wline);
2015 		if (width < view->ncols)
2016 			waddch(view->window, '\n');
2017 		if (++nprinted == 1)
2018 			*first_displayed_line = nlines;
2019 		free(line);
2020 		free(wline);
2021 		wline = NULL;
2022 	}
2023 	*last_displayed_line = nlines;
2024 
2025 	view_vborder(view);
2026 
2027 	if (*eof) {
2028 		while (nprinted < view->nlines) {
2029 			waddch(view->window, '\n');
2030 			nprinted++;
2031 		}
2032 
2033 		err = format_line(&wline, &width, TOG_EOF_STRING, view->ncols);
2034 		if (err) {
2035 			return err;
2036 		}
2037 
2038 		wstandout(view->window);
2039 		waddwstr(view->window, wline);
2040 		wstandend(view->window);
2041 	}
2042 
2043 	return NULL;
2044 }
2045 
2046 static char *
2047 get_datestr(time_t *time, char *datebuf)
2048 {
2049 	char *p, *s = ctime_r(time, datebuf);
2050 	p = strchr(s, '\n');
2051 	if (p)
2052 		*p = '\0';
2053 	return s;
2054 }
2055 
2056 static const struct got_error *
2057 write_commit_info(struct got_object_id *commit_id,
2058     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2059 {
2060 	const struct got_error *err = NULL;
2061 	char datebuf[26];
2062 	struct got_commit_object *commit;
2063 	char *id_str = NULL;
2064 	time_t committer_time;
2065 	const char *author, *committer;
2066 	char *refs_str = NULL;
2067 
2068 	if (refs) {
2069 		err = build_refs_str(&refs_str, refs, commit_id);
2070 		if (err)
2071 			return err;
2072 	}
2073 
2074 	err = got_object_open_as_commit(&commit, repo, commit_id);
2075 	if (err)
2076 		return err;
2077 
2078 	err = got_object_id_str(&id_str, commit_id);
2079 	if (err) {
2080 		err = got_error_from_errno("got_object_id_str");
2081 		goto done;
2082 	}
2083 
2084 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2085 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2086 		err = got_error_from_errno("fprintf");
2087 		goto done;
2088 	}
2089 	if (fprintf(outfile, "from: %s\n",
2090 	    got_object_commit_get_author(commit)) < 0) {
2091 		err = got_error_from_errno("fprintf");
2092 		goto done;
2093 	}
2094 	committer_time = got_object_commit_get_committer_time(commit);
2095 	if (fprintf(outfile, "date: %s UTC\n",
2096 	    get_datestr(&committer_time, datebuf)) < 0) {
2097 		err = got_error_from_errno("fprintf");
2098 		goto done;
2099 	}
2100 	author = got_object_commit_get_author(commit);
2101 	committer = got_object_commit_get_committer(commit);
2102 	if (strcmp(author, committer) != 0 &&
2103 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2104 		err = got_error_from_errno("fprintf");
2105 		goto done;
2106 	}
2107 	if (fprintf(outfile, "%s\n",
2108 	    got_object_commit_get_logmsg(commit)) < 0) {
2109 		err = got_error_from_errno("fprintf");
2110 		goto done;
2111 	}
2112 done:
2113 	free(id_str);
2114 	free(refs_str);
2115 	got_object_commit_close(commit);
2116 	return err;
2117 }
2118 
2119 static const struct got_error *
2120 create_diff(struct tog_diff_view_state *s)
2121 {
2122 	const struct got_error *err = NULL;
2123 	FILE *f = NULL;
2124 	int obj_type;
2125 
2126 	f = got_opentemp();
2127 	if (f == NULL) {
2128 		err = got_error_from_errno("got_opentemp");
2129 		goto done;
2130 	}
2131 	if (s->f && fclose(s->f) != 0) {
2132 		err = got_error_from_errno("fclose");
2133 		goto done;
2134 	}
2135 	s->f = f;
2136 
2137 	if (s->id1)
2138 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2139 	else
2140 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2141 	if (err)
2142 		goto done;
2143 
2144 	switch (obj_type) {
2145 	case GOT_OBJ_TYPE_BLOB:
2146 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2147 		    s->diff_context, s->repo, f);
2148 		break;
2149 	case GOT_OBJ_TYPE_TREE:
2150 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2151 		    s->diff_context, s->repo, f);
2152 		break;
2153 	case GOT_OBJ_TYPE_COMMIT: {
2154 		const struct got_object_id_queue *parent_ids;
2155 		struct got_object_qid *pid;
2156 		struct got_commit_object *commit2;
2157 
2158 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2159 		if (err)
2160 			break;
2161 		/* Show commit info if we're diffing to a parent/root commit. */
2162 		if (s->id1 == NULL)
2163 			write_commit_info(s->id2, s->refs, s->repo, f);
2164 		else {
2165 			parent_ids = got_object_commit_get_parent_ids(commit2);
2166 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2167 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2168 					write_commit_info(s->id2, s->refs,
2169 					    s->repo, f);
2170 					break;
2171 				}
2172 			}
2173 		}
2174 		got_object_commit_close(commit2);
2175 
2176 		err = got_diff_objects_as_commits(s->id1, s->id2,
2177 		    s->diff_context, s->repo, f);
2178 		break;
2179 	}
2180 	default:
2181 		err = got_error(GOT_ERR_OBJ_TYPE);
2182 		break;
2183 	}
2184 done:
2185 	if (f && fflush(f) != 0 && err == NULL)
2186 		err = got_error_from_errno("fflush");
2187 	return err;
2188 }
2189 
2190 static void
2191 diff_view_indicate_progress(struct tog_view *view)
2192 {
2193 	mvwaddstr(view->window, 0, 0, "diffing...");
2194 	update_panels();
2195 	doupdate();
2196 }
2197 
2198 static const struct got_error *
2199 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2200     struct got_object_id *id2, struct tog_view *log_view,
2201     struct got_reflist_head *refs, struct got_repository *repo)
2202 {
2203 	const struct got_error *err;
2204 
2205 	if (id1 != NULL && id2 != NULL) {
2206 	    int type1, type2;
2207 	    err = got_object_get_type(&type1, repo, id1);
2208 	    if (err)
2209 		return err;
2210 	    err = got_object_get_type(&type2, repo, id2);
2211 	    if (err)
2212 		return err;
2213 
2214 	    if (type1 != type2)
2215 		return got_error(GOT_ERR_OBJ_TYPE);
2216 	}
2217 
2218 	if (id1) {
2219 		view->state.diff.id1 = got_object_id_dup(id1);
2220 		if (view->state.diff.id1 == NULL)
2221 			return got_error_from_errno("got_object_id_dup");
2222 	} else
2223 		view->state.diff.id1 = NULL;
2224 
2225 	view->state.diff.id2 = got_object_id_dup(id2);
2226 	if (view->state.diff.id2 == NULL) {
2227 		free(view->state.diff.id1);
2228 		view->state.diff.id1 = NULL;
2229 		return got_error_from_errno("got_object_id_dup");
2230 	}
2231 	view->state.diff.f = NULL;
2232 	view->state.diff.first_displayed_line = 1;
2233 	view->state.diff.last_displayed_line = view->nlines;
2234 	view->state.diff.diff_context = 3;
2235 	view->state.diff.log_view = log_view;
2236 	view->state.diff.repo = repo;
2237 	view->state.diff.refs = refs;
2238 
2239 	if (log_view && view_is_splitscreen(view))
2240 		show_log_view(log_view); /* draw vborder */
2241 	diff_view_indicate_progress(view);
2242 
2243 	err = create_diff(&view->state.diff);
2244 	if (err) {
2245 		free(view->state.diff.id1);
2246 		view->state.diff.id1 = NULL;
2247 		free(view->state.diff.id2);
2248 		view->state.diff.id2 = NULL;
2249 		return err;
2250 	}
2251 
2252 	view->show = show_diff_view;
2253 	view->input = input_diff_view;
2254 	view->close = close_diff_view;
2255 
2256 	return NULL;
2257 }
2258 
2259 static const struct got_error *
2260 close_diff_view(struct tog_view *view)
2261 {
2262 	const struct got_error *err = NULL;
2263 
2264 	free(view->state.diff.id1);
2265 	view->state.diff.id1 = NULL;
2266 	free(view->state.diff.id2);
2267 	view->state.diff.id2 = NULL;
2268 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2269 		err = got_error_from_errno("fclose");
2270 	return err;
2271 }
2272 
2273 static const struct got_error *
2274 show_diff_view(struct tog_view *view)
2275 {
2276 	const struct got_error *err;
2277 	struct tog_diff_view_state *s = &view->state.diff;
2278 	char *id_str1 = NULL, *id_str2, *header;
2279 
2280 	if (s->id1) {
2281 		err = got_object_id_str(&id_str1, s->id1);
2282 		if (err)
2283 			return err;
2284 	}
2285 	err = got_object_id_str(&id_str2, s->id2);
2286 	if (err)
2287 		return err;
2288 
2289 	if (asprintf(&header, "diff %s %s",
2290 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2291 		err = got_error_from_errno("asprintf");
2292 		free(id_str1);
2293 		free(id_str2);
2294 		return err;
2295 	}
2296 	free(id_str1);
2297 	free(id_str2);
2298 
2299 	return draw_file(view, s->f, &s->first_displayed_line,
2300 	    &s->last_displayed_line, &s->eof, view->nlines,
2301 	    header);
2302 }
2303 
2304 static const struct got_error *
2305 set_selected_commit(struct tog_diff_view_state *s,
2306     struct commit_queue_entry *entry)
2307 {
2308 	const struct got_error *err;
2309 	const struct got_object_id_queue *parent_ids;
2310 	struct got_commit_object *selected_commit;
2311 	struct got_object_qid *pid;
2312 
2313 	free(s->id2);
2314 	s->id2 = got_object_id_dup(entry->id);
2315 	if (s->id2 == NULL)
2316 		return got_error_from_errno("got_object_id_dup");
2317 
2318 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2319 	if (err)
2320 		return err;
2321 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2322 	free(s->id1);
2323 	pid = SIMPLEQ_FIRST(parent_ids);
2324 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2325 	got_object_commit_close(selected_commit);
2326 	return NULL;
2327 }
2328 
2329 static const struct got_error *
2330 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2331     struct tog_view **focus_view, struct tog_view *view, int ch)
2332 {
2333 	const struct got_error *err = NULL;
2334 	struct tog_diff_view_state *s = &view->state.diff;
2335 	struct tog_log_view_state *ls;
2336 	struct commit_queue_entry *entry;
2337 	int i;
2338 
2339 	switch (ch) {
2340 	case 'k':
2341 	case KEY_UP:
2342 		if (s->first_displayed_line > 1)
2343 			s->first_displayed_line--;
2344 		break;
2345 	case KEY_PPAGE:
2346 	case CTRL('b'):
2347 		if (s->first_displayed_line == 1)
2348 			break;
2349 		i = 0;
2350 		while (i++ < view->nlines - 1 &&
2351 		    s->first_displayed_line > 1)
2352 			s->first_displayed_line--;
2353 		break;
2354 	case 'j':
2355 	case KEY_DOWN:
2356 		if (!s->eof)
2357 			s->first_displayed_line++;
2358 		break;
2359 	case KEY_NPAGE:
2360 	case CTRL('f'):
2361 	case ' ':
2362 		if (s->eof)
2363 			break;
2364 		i = 0;
2365 		while (!s->eof && i++ < view->nlines - 1) {
2366 			char *line;
2367 			line = parse_next_line(s->f, NULL);
2368 			s->first_displayed_line++;
2369 			if (line == NULL)
2370 				break;
2371 		}
2372 		break;
2373 	case '[':
2374 		if (s->diff_context > 0) {
2375 			s->diff_context--;
2376 			diff_view_indicate_progress(view);
2377 			err = create_diff(s);
2378 		}
2379 		break;
2380 	case ']':
2381 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2382 			s->diff_context++;
2383 			diff_view_indicate_progress(view);
2384 			err = create_diff(s);
2385 		}
2386 		break;
2387 	case '<':
2388 	case ',':
2389 		if (s->log_view == NULL)
2390 			break;
2391 		ls = &s->log_view->state.log;
2392 		entry = TAILQ_PREV(ls->selected_entry,
2393 		    commit_queue_head, entry);
2394 		if (entry == NULL)
2395 			break;
2396 
2397 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2398 		    KEY_UP);
2399 		if (err)
2400 			break;
2401 
2402 		err = set_selected_commit(s, entry);
2403 		if (err)
2404 			break;
2405 
2406 		s->first_displayed_line = 1;
2407 		s->last_displayed_line = view->nlines;
2408 
2409 		diff_view_indicate_progress(view);
2410 		err = create_diff(s);
2411 		break;
2412 	case '>':
2413 	case '.':
2414 		if (s->log_view == NULL)
2415 			break;
2416 		ls = &s->log_view->state.log;
2417 
2418 		if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2419 			ls->thread_args.commits_needed++;
2420 
2421 			/* Display "loading..." in log view. */
2422 			show_log_view(s->log_view);
2423 			update_panels();
2424 			doupdate();
2425 
2426 			err = trigger_log_thread(1 /* load_all */,
2427 			    &ls->thread_args.commits_needed,
2428 			    &ls->thread_args.log_complete,
2429 			    &ls->thread_args.need_commits);
2430 			if (err)
2431 				break;
2432 		}
2433 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2434 		    KEY_DOWN);
2435 		if (err)
2436 			break;
2437 
2438 		entry = TAILQ_NEXT(ls->selected_entry, entry);
2439 		if (entry == NULL)
2440 			break;
2441 
2442 		err = set_selected_commit(s, entry);
2443 		if (err)
2444 			break;
2445 
2446 		s->first_displayed_line = 1;
2447 		s->last_displayed_line = view->nlines;
2448 
2449 		diff_view_indicate_progress(view);
2450 		err = create_diff(s);
2451 		break;
2452 	default:
2453 		break;
2454 	}
2455 
2456 	return err;
2457 }
2458 
2459 static const struct got_error *
2460 cmd_diff(int argc, char *argv[])
2461 {
2462 	const struct got_error *error = NULL;
2463 	struct got_repository *repo = NULL;
2464 	struct got_reflist_head refs;
2465 	struct got_object_id *id1 = NULL, *id2 = NULL;
2466 	char *repo_path = NULL;
2467 	char *id_str1 = NULL, *id_str2 = NULL;
2468 	int ch;
2469 	struct tog_view *view;
2470 
2471 	SIMPLEQ_INIT(&refs);
2472 
2473 #ifndef PROFILE
2474 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2475 	    NULL) == -1)
2476 		err(1, "pledge");
2477 #endif
2478 
2479 	while ((ch = getopt(argc, argv, "")) != -1) {
2480 		switch (ch) {
2481 		default:
2482 			usage_diff();
2483 			/* NOTREACHED */
2484 		}
2485 	}
2486 
2487 	argc -= optind;
2488 	argv += optind;
2489 
2490 	if (argc == 0) {
2491 		usage_diff(); /* TODO show local worktree changes */
2492 	} else if (argc == 2) {
2493 		repo_path = getcwd(NULL, 0);
2494 		if (repo_path == NULL)
2495 			return got_error_from_errno("getcwd");
2496 		id_str1 = argv[0];
2497 		id_str2 = argv[1];
2498 	} else if (argc == 3) {
2499 		repo_path = realpath(argv[0], NULL);
2500 		if (repo_path == NULL)
2501 			return got_error_from_errno2("realpath", argv[0]);
2502 		id_str1 = argv[1];
2503 		id_str2 = argv[2];
2504 	} else
2505 		usage_diff();
2506 
2507 	init_curses();
2508 
2509 	error = got_repo_open(&repo, repo_path);
2510 	if (error)
2511 		goto done;
2512 
2513 	error = apply_unveil(got_repo_get_path(repo), NULL);
2514 	if (error)
2515 		goto done;
2516 
2517 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2518 	if (error)
2519 		goto done;
2520 
2521 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2522 	if (error)
2523 		goto done;
2524 
2525 	error = got_ref_list(&refs, repo);
2526 	if (error)
2527 		goto done;
2528 
2529 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2530 	if (view == NULL) {
2531 		error = got_error_from_errno("view_open");
2532 		goto done;
2533 	}
2534 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2535 	if (error)
2536 		goto done;
2537 	error = view_loop(view);
2538 done:
2539 	free(repo_path);
2540 	got_repo_close(repo);
2541 	got_ref_list_free(&refs);
2542 	return error;
2543 }
2544 
2545 __dead static void
2546 usage_blame(void)
2547 {
2548 	endwin();
2549 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2550 	    getprogname());
2551 	exit(1);
2552 }
2553 
2554 struct tog_blame_line {
2555 	int annotated;
2556 	struct got_object_id *id;
2557 };
2558 
2559 static const struct got_error *
2560 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2561     const char *path, struct tog_blame_line *lines, int nlines,
2562     int blame_complete, int selected_line, int *first_displayed_line,
2563     int *last_displayed_line, int *eof, int max_lines)
2564 {
2565 	const struct got_error *err;
2566 	int lineno = 0, nprinted = 0;
2567 	char *line;
2568 	size_t len;
2569 	wchar_t *wline;
2570 	int width, wlimit;
2571 	struct tog_blame_line *blame_line;
2572 	struct got_object_id *prev_id = NULL;
2573 	char *id_str;
2574 
2575 	err = got_object_id_str(&id_str, id);
2576 	if (err)
2577 		return err;
2578 
2579 	rewind(f);
2580 	werase(view->window);
2581 
2582 	if (asprintf(&line, "commit %s", id_str) == -1) {
2583 		err = got_error_from_errno("asprintf");
2584 		free(id_str);
2585 		return err;
2586 	}
2587 
2588 	err = format_line(&wline, &width, line, view->ncols);
2589 	free(line);
2590 	line = NULL;
2591 	if (view_needs_focus_indication(view))
2592 		wstandout(view->window);
2593 	waddwstr(view->window, wline);
2594 	if (view_needs_focus_indication(view))
2595 		wstandend(view->window);
2596 	free(wline);
2597 	wline = NULL;
2598 	if (width < view->ncols)
2599 		waddch(view->window, '\n');
2600 
2601 	if (asprintf(&line, "[%d/%d] %s%s",
2602 	    *first_displayed_line - 1 + selected_line, nlines,
2603 	    blame_complete ? "" : "annotating... ", path) == -1) {
2604 		free(id_str);
2605 		return got_error_from_errno("asprintf");
2606 	}
2607 	free(id_str);
2608 	err = format_line(&wline, &width, line, view->ncols);
2609 	free(line);
2610 	line = NULL;
2611 	if (err)
2612 		return err;
2613 	waddwstr(view->window, wline);
2614 	free(wline);
2615 	wline = NULL;
2616 	if (width < view->ncols)
2617 		waddch(view->window, '\n');
2618 
2619 	*eof = 0;
2620 	while (nprinted < max_lines - 2) {
2621 		line = parse_next_line(f, &len);
2622 		if (line == NULL) {
2623 			*eof = 1;
2624 			break;
2625 		}
2626 		if (++lineno < *first_displayed_line) {
2627 			free(line);
2628 			continue;
2629 		}
2630 
2631 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2632 		err = format_line(&wline, &width, line, wlimit);
2633 		if (err) {
2634 			free(line);
2635 			return err;
2636 		}
2637 
2638 		if (view->focussed && nprinted == selected_line - 1)
2639 			wstandout(view->window);
2640 
2641 		blame_line = &lines[lineno - 1];
2642 		if (blame_line->annotated && prev_id &&
2643 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2644 			waddstr(view->window, "         ");
2645 		else if (blame_line->annotated) {
2646 			char *id_str;
2647 			err = got_object_id_str(&id_str, blame_line->id);
2648 			if (err) {
2649 				free(line);
2650 				free(wline);
2651 				return err;
2652 			}
2653 			wprintw(view->window, "%.8s ", id_str);
2654 			free(id_str);
2655 			prev_id = blame_line->id;
2656 		} else {
2657 			waddstr(view->window, "........ ");
2658 			prev_id = NULL;
2659 		}
2660 
2661 		waddwstr(view->window, wline);
2662 		while (width < wlimit) {
2663 			waddch(view->window, ' ');
2664 			width++;
2665 		}
2666 		if (view->focussed && nprinted == selected_line - 1)
2667 			wstandend(view->window);
2668 		if (++nprinted == 1)
2669 			*first_displayed_line = lineno;
2670 		free(line);
2671 		free(wline);
2672 		wline = NULL;
2673 	}
2674 	*last_displayed_line = lineno;
2675 
2676 	view_vborder(view);
2677 
2678 	return NULL;
2679 }
2680 
2681 static const struct got_error *
2682 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2683 {
2684 	const struct got_error *err = NULL;
2685 	struct tog_blame_cb_args *a = arg;
2686 	struct tog_blame_line *line;
2687 	int errcode;
2688 
2689 	if (nlines != a->nlines ||
2690 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2691 		return got_error(GOT_ERR_RANGE);
2692 
2693 	errcode = pthread_mutex_lock(&tog_mutex);
2694 	if (errcode)
2695 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2696 
2697 	if (*a->quit) {	/* user has quit the blame view */
2698 		err = got_error(GOT_ERR_ITER_COMPLETED);
2699 		goto done;
2700 	}
2701 
2702 	if (lineno == -1)
2703 		goto done; /* no change in this commit */
2704 
2705 	line = &a->lines[lineno - 1];
2706 	if (line->annotated)
2707 		goto done;
2708 
2709 	line->id = got_object_id_dup(id);
2710 	if (line->id == NULL) {
2711 		err = got_error_from_errno("got_object_id_dup");
2712 		goto done;
2713 	}
2714 	line->annotated = 1;
2715 done:
2716 	errcode = pthread_mutex_unlock(&tog_mutex);
2717 	if (errcode)
2718 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2719 	return err;
2720 }
2721 
2722 static void *
2723 blame_thread(void *arg)
2724 {
2725 	const struct got_error *err;
2726 	struct tog_blame_thread_args *ta = arg;
2727 	struct tog_blame_cb_args *a = ta->cb_args;
2728 	int errcode;
2729 
2730 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2731 	    blame_cb, ta->cb_args);
2732 
2733 	errcode = pthread_mutex_lock(&tog_mutex);
2734 	if (errcode)
2735 		return (void *)got_error_set_errno(errcode,
2736 		    "pthread_mutex_lock");
2737 
2738 	got_repo_close(ta->repo);
2739 	ta->repo = NULL;
2740 	*ta->complete = 1;
2741 
2742 	errcode = pthread_mutex_unlock(&tog_mutex);
2743 	if (errcode && err == NULL)
2744 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2745 
2746 	return (void *)err;
2747 }
2748 
2749 static struct got_object_id *
2750 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2751     int selected_line)
2752 {
2753 	struct tog_blame_line *line;
2754 
2755 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2756 	if (!line->annotated)
2757 		return NULL;
2758 
2759 	return line->id;
2760 }
2761 
2762 static const struct got_error *
2763 stop_blame(struct tog_blame *blame)
2764 {
2765 	const struct got_error *err = NULL;
2766 	int i;
2767 
2768 	if (blame->thread) {
2769 		int errcode;
2770 		errcode = pthread_mutex_unlock(&tog_mutex);
2771 		if (errcode)
2772 			return got_error_set_errno(errcode,
2773 			    "pthread_mutex_unlock");
2774 		errcode = pthread_join(blame->thread, (void **)&err);
2775 		if (errcode)
2776 			return got_error_set_errno(errcode, "pthread_join");
2777 		errcode = pthread_mutex_lock(&tog_mutex);
2778 		if (errcode)
2779 			return got_error_set_errno(errcode,
2780 			    "pthread_mutex_lock");
2781 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2782 			err = NULL;
2783 		blame->thread = NULL;
2784 	}
2785 	if (blame->thread_args.repo) {
2786 		got_repo_close(blame->thread_args.repo);
2787 		blame->thread_args.repo = NULL;
2788 	}
2789 	if (blame->f) {
2790 		if (fclose(blame->f) != 0 && err == NULL)
2791 			err = got_error_from_errno("fclose");
2792 		blame->f = NULL;
2793 	}
2794 	if (blame->lines) {
2795 		for (i = 0; i < blame->nlines; i++)
2796 			free(blame->lines[i].id);
2797 		free(blame->lines);
2798 		blame->lines = NULL;
2799 	}
2800 	free(blame->cb_args.commit_id);
2801 	blame->cb_args.commit_id = NULL;
2802 
2803 	return err;
2804 }
2805 
2806 static const struct got_error *
2807 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2808     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2809     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2810     struct got_repository *repo)
2811 {
2812 	const struct got_error *err = NULL;
2813 	struct got_blob_object *blob = NULL;
2814 	struct got_repository *thread_repo = NULL;
2815 	struct got_object_id *obj_id = NULL;
2816 	int obj_type;
2817 
2818 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2819 	if (err)
2820 		return err;
2821 	if (obj_id == NULL)
2822 		return got_error(GOT_ERR_NO_OBJ);
2823 
2824 	err = got_object_get_type(&obj_type, repo, obj_id);
2825 	if (err)
2826 		goto done;
2827 
2828 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2829 		err = got_error(GOT_ERR_OBJ_TYPE);
2830 		goto done;
2831 	}
2832 
2833 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2834 	if (err)
2835 		goto done;
2836 	blame->f = got_opentemp();
2837 	if (blame->f == NULL) {
2838 		err = got_error_from_errno("got_opentemp");
2839 		goto done;
2840 	}
2841 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2842 	    blame->f, blob);
2843 	if (err)
2844 		goto done;
2845 
2846 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2847 	if (blame->lines == NULL) {
2848 		err = got_error_from_errno("calloc");
2849 		goto done;
2850 	}
2851 
2852 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2853 	if (err)
2854 		goto done;
2855 
2856 	blame->cb_args.view = view;
2857 	blame->cb_args.lines = blame->lines;
2858 	blame->cb_args.nlines = blame->nlines;
2859 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2860 	if (blame->cb_args.commit_id == NULL) {
2861 		err = got_error_from_errno("got_object_id_dup");
2862 		goto done;
2863 	}
2864 	blame->cb_args.quit = done;
2865 
2866 	blame->thread_args.path = path;
2867 	blame->thread_args.repo = thread_repo;
2868 	blame->thread_args.cb_args = &blame->cb_args;
2869 	blame->thread_args.complete = blame_complete;
2870 	*blame_complete = 0;
2871 
2872 done:
2873 	if (blob)
2874 		got_object_blob_close(blob);
2875 	free(obj_id);
2876 	if (err)
2877 		stop_blame(blame);
2878 	return err;
2879 }
2880 
2881 static const struct got_error *
2882 open_blame_view(struct tog_view *view, char *path,
2883     struct got_object_id *commit_id, struct got_reflist_head *refs,
2884     struct got_repository *repo)
2885 {
2886 	const struct got_error *err = NULL;
2887 	struct tog_blame_view_state *s = &view->state.blame;
2888 
2889 	SIMPLEQ_INIT(&s->blamed_commits);
2890 
2891 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2892 	if (err)
2893 		return err;
2894 
2895 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2896 	s->first_displayed_line = 1;
2897 	s->last_displayed_line = view->nlines;
2898 	s->selected_line = 1;
2899 	s->blame_complete = 0;
2900 	s->path = path;
2901 	if (s->path == NULL)
2902 		return got_error_from_errno("open_blame_view");
2903 	s->repo = repo;
2904 	s->refs = refs;
2905 	s->commit_id = commit_id;
2906 	memset(&s->blame, 0, sizeof(s->blame));
2907 
2908 	view->show = show_blame_view;
2909 	view->input = input_blame_view;
2910 	view->close = close_blame_view;
2911 
2912 	return run_blame(&s->blame, view, &s->blame_complete,
2913 	    &s->first_displayed_line, &s->last_displayed_line,
2914 	    &s->selected_line, &s->done, &s->eof, s->path,
2915 	    s->blamed_commit->id, s->repo);
2916 }
2917 
2918 static const struct got_error *
2919 close_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 
2924 	if (s->blame.thread)
2925 		err = stop_blame(&s->blame);
2926 
2927 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2928 		struct got_object_qid *blamed_commit;
2929 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2930 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2931 		got_object_qid_free(blamed_commit);
2932 	}
2933 
2934 	free(s->path);
2935 
2936 	return err;
2937 }
2938 
2939 static const struct got_error *
2940 show_blame_view(struct tog_view *view)
2941 {
2942 	const struct got_error *err = NULL;
2943 	struct tog_blame_view_state *s = &view->state.blame;
2944 	int errcode;
2945 
2946 	if (s->blame.thread == NULL) {
2947 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2948 		    &s->blame.thread_args);
2949 		if (errcode)
2950 			return got_error_set_errno(errcode, "pthread_create");
2951 	}
2952 
2953 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2954 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2955 	    s->selected_line, &s->first_displayed_line,
2956 	    &s->last_displayed_line, &s->eof, view->nlines);
2957 
2958 	view_vborder(view);
2959 	return err;
2960 }
2961 
2962 static const struct got_error *
2963 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2964     struct tog_view **focus_view, struct tog_view *view, int ch)
2965 {
2966 	const struct got_error *err = NULL, *thread_err = NULL;
2967 	struct tog_view *diff_view;
2968 	struct tog_blame_view_state *s = &view->state.blame;
2969 	int begin_x = 0;
2970 
2971 	switch (ch) {
2972 	case 'q':
2973 		s->done = 1;
2974 		break;
2975 	case 'k':
2976 	case KEY_UP:
2977 		if (s->selected_line > 1)
2978 			s->selected_line--;
2979 		else if (s->selected_line == 1 &&
2980 		    s->first_displayed_line > 1)
2981 			s->first_displayed_line--;
2982 		break;
2983 	case KEY_PPAGE:
2984 		if (s->first_displayed_line == 1) {
2985 			s->selected_line = 1;
2986 			break;
2987 		}
2988 		if (s->first_displayed_line > view->nlines - 2)
2989 			s->first_displayed_line -=
2990 			    (view->nlines - 2);
2991 		else
2992 			s->first_displayed_line = 1;
2993 		break;
2994 	case 'j':
2995 	case KEY_DOWN:
2996 		if (s->selected_line < view->nlines - 2 &&
2997 		    s->first_displayed_line +
2998 		    s->selected_line <= s->blame.nlines)
2999 			s->selected_line++;
3000 		else if (s->last_displayed_line <
3001 		    s->blame.nlines)
3002 			s->first_displayed_line++;
3003 		break;
3004 	case 'b':
3005 	case 'p': {
3006 		struct got_object_id *id = NULL;
3007 		id = get_selected_commit_id(s->blame.lines,
3008 		    s->first_displayed_line, s->selected_line);
3009 		if (id == NULL)
3010 			break;
3011 		if (ch == 'p') {
3012 			struct got_commit_object *commit;
3013 			struct got_object_qid *pid;
3014 			struct got_object_id *blob_id = NULL;
3015 			int obj_type;
3016 			err = got_object_open_as_commit(&commit,
3017 			    s->repo, id);
3018 			if (err)
3019 				break;
3020 			pid = SIMPLEQ_FIRST(
3021 			    got_object_commit_get_parent_ids(commit));
3022 			if (pid == NULL) {
3023 				got_object_commit_close(commit);
3024 				break;
3025 			}
3026 			/* Check if path history ends here. */
3027 			err = got_object_id_by_path(&blob_id, s->repo,
3028 			    pid->id, s->path);
3029 			if (err) {
3030 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
3031 					err = NULL;
3032 				got_object_commit_close(commit);
3033 				break;
3034 			}
3035 			err = got_object_get_type(&obj_type, s->repo,
3036 			    blob_id);
3037 			free(blob_id);
3038 			/* Can't blame non-blob type objects. */
3039 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
3040 				got_object_commit_close(commit);
3041 				break;
3042 			}
3043 			err = got_object_qid_alloc(&s->blamed_commit,
3044 			    pid->id);
3045 			got_object_commit_close(commit);
3046 		} else {
3047 			if (got_object_id_cmp(id,
3048 			    s->blamed_commit->id) == 0)
3049 				break;
3050 			err = got_object_qid_alloc(&s->blamed_commit,
3051 			    id);
3052 		}
3053 		if (err)
3054 			break;
3055 		s->done = 1;
3056 		thread_err = stop_blame(&s->blame);
3057 		s->done = 0;
3058 		if (thread_err)
3059 			break;
3060 		SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3061 		    s->blamed_commit, entry);
3062 		err = run_blame(&s->blame, view, &s->blame_complete,
3063 		    &s->first_displayed_line, &s->last_displayed_line,
3064 		    &s->selected_line, &s->done, &s->eof,
3065 		    s->path, s->blamed_commit->id, s->repo);
3066 		if (err)
3067 			break;
3068 		break;
3069 	}
3070 	case 'B': {
3071 		struct got_object_qid *first;
3072 		first = SIMPLEQ_FIRST(&s->blamed_commits);
3073 		if (!got_object_id_cmp(first->id, s->commit_id))
3074 			break;
3075 		s->done = 1;
3076 		thread_err = stop_blame(&s->blame);
3077 		s->done = 0;
3078 		if (thread_err)
3079 			break;
3080 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3081 		got_object_qid_free(s->blamed_commit);
3082 		s->blamed_commit =
3083 		    SIMPLEQ_FIRST(&s->blamed_commits);
3084 		err = run_blame(&s->blame, view, &s->blame_complete,
3085 		    &s->first_displayed_line, &s->last_displayed_line,
3086 		    &s->selected_line, &s->done, &s->eof, s->path,
3087 		    s->blamed_commit->id, s->repo);
3088 		if (err)
3089 			break;
3090 		break;
3091 	}
3092 	case KEY_ENTER:
3093 	case '\r': {
3094 		struct got_object_id *id = NULL;
3095 		struct got_object_qid *pid;
3096 		struct got_commit_object *commit = NULL;
3097 		id = get_selected_commit_id(s->blame.lines,
3098 		    s->first_displayed_line, s->selected_line);
3099 		if (id == NULL)
3100 			break;
3101 		err = got_object_open_as_commit(&commit, s->repo, id);
3102 		if (err)
3103 			break;
3104 		pid = SIMPLEQ_FIRST(
3105 		    got_object_commit_get_parent_ids(commit));
3106 		if (view_is_parent_view(view))
3107 		    begin_x = view_split_begin_x(view->begin_x);
3108 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3109 		if (diff_view == NULL) {
3110 			got_object_commit_close(commit);
3111 			err = got_error_from_errno("view_open");
3112 			break;
3113 		}
3114 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
3115 		    id, NULL, s->refs, s->repo);
3116 		got_object_commit_close(commit);
3117 		if (err) {
3118 			view_close(diff_view);
3119 			break;
3120 		}
3121 		if (view_is_parent_view(view)) {
3122 			err = view_close_child(view);
3123 			if (err)
3124 				break;
3125 			err = view_set_child(view, diff_view);
3126 			if (err) {
3127 				view_close(diff_view);
3128 				break;
3129 			}
3130 			*focus_view = diff_view;
3131 			view->child_focussed = 1;
3132 		} else
3133 			*new_view = diff_view;
3134 		if (err)
3135 			break;
3136 		break;
3137 	}
3138 	case KEY_NPAGE:
3139 	case ' ':
3140 		if (s->last_displayed_line >= s->blame.nlines &&
3141 		    s->selected_line >= MIN(s->blame.nlines,
3142 		    view->nlines - 2)) {
3143 			break;
3144 		}
3145 		if (s->last_displayed_line >= s->blame.nlines &&
3146 		    s->selected_line < view->nlines - 2) {
3147 			s->selected_line = MIN(s->blame.nlines,
3148 			    view->nlines - 2);
3149 			break;
3150 		}
3151 		if (s->last_displayed_line + view->nlines - 2
3152 		    <= s->blame.nlines)
3153 			s->first_displayed_line +=
3154 			    view->nlines - 2;
3155 		else
3156 			s->first_displayed_line =
3157 			    s->blame.nlines -
3158 			    (view->nlines - 3);
3159 		break;
3160 	case KEY_RESIZE:
3161 		if (s->selected_line > view->nlines - 2) {
3162 			s->selected_line = MIN(s->blame.nlines,
3163 			    view->nlines - 2);
3164 		}
3165 		break;
3166 	default:
3167 		break;
3168 	}
3169 	return thread_err ? thread_err : err;
3170 }
3171 
3172 static const struct got_error *
3173 cmd_blame(int argc, char *argv[])
3174 {
3175 	const struct got_error *error;
3176 	struct got_repository *repo = NULL;
3177 	struct got_reflist_head refs;
3178 	struct got_worktree *worktree = NULL;
3179 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3180 	struct got_object_id *commit_id = NULL;
3181 	char *commit_id_str = NULL;
3182 	int ch;
3183 	struct tog_view *view;
3184 
3185 	SIMPLEQ_INIT(&refs);
3186 
3187 #ifndef PROFILE
3188 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3189 	    NULL) == -1)
3190 		err(1, "pledge");
3191 #endif
3192 
3193 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3194 		switch (ch) {
3195 		case 'c':
3196 			commit_id_str = optarg;
3197 			break;
3198 		case 'r':
3199 			repo_path = realpath(optarg, NULL);
3200 			if (repo_path == NULL)
3201 				err(1, "-r option");
3202 			break;
3203 		default:
3204 			usage_blame();
3205 			/* NOTREACHED */
3206 		}
3207 	}
3208 
3209 	argc -= optind;
3210 	argv += optind;
3211 
3212 	if (argc == 1)
3213 		path = argv[0];
3214 	else
3215 		usage_blame();
3216 
3217 	cwd = getcwd(NULL, 0);
3218 	if (cwd == NULL) {
3219 		error = got_error_from_errno("getcwd");
3220 		goto done;
3221 	}
3222 	if (repo_path == NULL) {
3223 		error = got_worktree_open(&worktree, cwd);
3224 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3225 			goto done;
3226 		else
3227 			error = NULL;
3228 		if (worktree) {
3229 			repo_path =
3230 			    strdup(got_worktree_get_repo_path(worktree));
3231 			if (repo_path == NULL)
3232 				error = got_error_from_errno("strdup");
3233 			if (error)
3234 				goto done;
3235 		} else {
3236 			repo_path = strdup(cwd);
3237 			if (repo_path == NULL) {
3238 				error = got_error_from_errno("strdup");
3239 				goto done;
3240 			}
3241 		}
3242 	}
3243 
3244 	init_curses();
3245 
3246 	error = got_repo_open(&repo, repo_path);
3247 	if (error != NULL)
3248 		goto done;
3249 
3250 	error = apply_unveil(got_repo_get_path(repo), NULL);
3251 	if (error)
3252 		goto done;
3253 
3254 	if (worktree) {
3255 		const char *prefix = got_worktree_get_path_prefix(worktree);
3256 		char *p, *worktree_subdir = cwd +
3257 		    strlen(got_worktree_get_root_path(worktree));
3258 		if (asprintf(&p, "%s%s%s%s%s",
3259 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3260 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3261 		    path) == -1) {
3262 			error = got_error_from_errno("asprintf");
3263 			goto done;
3264 		}
3265 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3266 		free(p);
3267 	} else {
3268 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3269 	}
3270 	if (error)
3271 		goto done;
3272 
3273 	if (commit_id_str == NULL) {
3274 		struct got_reference *head_ref;
3275 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0);
3276 		if (error != NULL)
3277 			goto done;
3278 		error = got_ref_resolve(&commit_id, repo, head_ref);
3279 		got_ref_close(head_ref);
3280 	} else {
3281 		error = got_object_resolve_id_str(&commit_id, repo,
3282 		    commit_id_str);
3283 	}
3284 	if (error != NULL)
3285 		goto done;
3286 
3287 	error = got_ref_list(&refs, repo);
3288 	if (error)
3289 		goto done;
3290 
3291 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3292 	if (view == NULL) {
3293 		error = got_error_from_errno("view_open");
3294 		goto done;
3295 	}
3296 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3297 	if (error)
3298 		goto done;
3299 	error = view_loop(view);
3300 done:
3301 	free(repo_path);
3302 	free(cwd);
3303 	free(commit_id);
3304 	if (worktree)
3305 		got_worktree_close(worktree);
3306 	if (repo)
3307 		got_repo_close(repo);
3308 	got_ref_list_free(&refs);
3309 	return error;
3310 }
3311 
3312 static const struct got_error *
3313 draw_tree_entries(struct tog_view *view,
3314     struct got_tree_entry **first_displayed_entry,
3315     struct got_tree_entry **last_displayed_entry,
3316     struct got_tree_entry **selected_entry, int *ndisplayed,
3317     const char *label, int show_ids, const char *parent_path,
3318     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3319 {
3320 	const struct got_error *err = NULL;
3321 	struct got_tree_entry *te;
3322 	wchar_t *wline;
3323 	int width, n;
3324 
3325 	*ndisplayed = 0;
3326 
3327 	werase(view->window);
3328 
3329 	if (limit == 0)
3330 		return NULL;
3331 
3332 	err = format_line(&wline, &width, label, view->ncols);
3333 	if (err)
3334 		return err;
3335 	if (view_needs_focus_indication(view))
3336 		wstandout(view->window);
3337 	waddwstr(view->window, wline);
3338 	if (view_needs_focus_indication(view))
3339 		wstandend(view->window);
3340 	free(wline);
3341 	wline = NULL;
3342 	if (width < view->ncols)
3343 		waddch(view->window, '\n');
3344 	if (--limit <= 0)
3345 		return NULL;
3346 	err = format_line(&wline, &width, parent_path, view->ncols);
3347 	if (err)
3348 		return err;
3349 	waddwstr(view->window, wline);
3350 	free(wline);
3351 	wline = NULL;
3352 	if (width < view->ncols)
3353 		waddch(view->window, '\n');
3354 	if (--limit <= 0)
3355 		return NULL;
3356 	waddch(view->window, '\n');
3357 	if (--limit <= 0)
3358 		return NULL;
3359 
3360 	te = SIMPLEQ_FIRST(&entries->head);
3361 	if (*first_displayed_entry == NULL) {
3362 		if (selected == 0) {
3363 			if (view->focussed)
3364 				wstandout(view->window);
3365 			*selected_entry = NULL;
3366 		}
3367 		waddstr(view->window, "  ..\n");	/* parent directory */
3368 		if (selected == 0 && view->focussed)
3369 			wstandend(view->window);
3370 		(*ndisplayed)++;
3371 		if (--limit <= 0)
3372 			return NULL;
3373 		n = 1;
3374 	} else {
3375 		n = 0;
3376 		while (te != *first_displayed_entry)
3377 			te = SIMPLEQ_NEXT(te, entry);
3378 	}
3379 
3380 	while (te) {
3381 		char *line = NULL, *id_str = NULL;
3382 
3383 		if (show_ids) {
3384 			err = got_object_id_str(&id_str, te->id);
3385 			if (err)
3386 				return got_error_from_errno(
3387 				    "got_object_id_str");
3388 		}
3389 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3390 		    te->name, S_ISDIR(te->mode) ? "/" :
3391 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3392 			free(id_str);
3393 			return got_error_from_errno("asprintf");
3394 		}
3395 		free(id_str);
3396 		err = format_line(&wline, &width, line, view->ncols);
3397 		if (err) {
3398 			free(line);
3399 			break;
3400 		}
3401 		if (n == selected) {
3402 			if (view->focussed)
3403 				wstandout(view->window);
3404 			*selected_entry = te;
3405 		}
3406 		waddwstr(view->window, wline);
3407 		if (width < view->ncols)
3408 			waddch(view->window, '\n');
3409 		if (n == selected && view->focussed)
3410 			wstandend(view->window);
3411 		free(line);
3412 		free(wline);
3413 		wline = NULL;
3414 		n++;
3415 		(*ndisplayed)++;
3416 		*last_displayed_entry = te;
3417 		if (--limit <= 0)
3418 			break;
3419 		te = SIMPLEQ_NEXT(te, entry);
3420 	}
3421 
3422 	return err;
3423 }
3424 
3425 static void
3426 tree_scroll_up(struct tog_view *view,
3427     struct got_tree_entry **first_displayed_entry, int maxscroll,
3428     const struct got_tree_entries *entries, int isroot)
3429 {
3430 	struct got_tree_entry *te, *prev;
3431 	int i;
3432 
3433 	if (*first_displayed_entry == NULL)
3434 		return;
3435 
3436 	te = SIMPLEQ_FIRST(&entries->head);
3437 	if (*first_displayed_entry == te) {
3438 		if (!isroot)
3439 			*first_displayed_entry = NULL;
3440 		return;
3441 	}
3442 
3443 	/* XXX this is stupid... switch to TAILQ? */
3444 	for (i = 0; i < maxscroll; i++) {
3445 		while (te != *first_displayed_entry) {
3446 			prev = te;
3447 			te = SIMPLEQ_NEXT(te, entry);
3448 		}
3449 		*first_displayed_entry = prev;
3450 		te = SIMPLEQ_FIRST(&entries->head);
3451 	}
3452 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3453 		*first_displayed_entry = NULL;
3454 }
3455 
3456 static int
3457 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3458 	struct got_tree_entry *last_displayed_entry,
3459 	const struct got_tree_entries *entries)
3460 {
3461 	struct got_tree_entry *next, *last;
3462 	int n = 0;
3463 
3464 	if (*first_displayed_entry)
3465 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3466 	else
3467 		next = SIMPLEQ_FIRST(&entries->head);
3468 	last = last_displayed_entry;
3469 	while (next && last && n++ < maxscroll) {
3470 		last = SIMPLEQ_NEXT(last, entry);
3471 		if (last) {
3472 			*first_displayed_entry = next;
3473 			next = SIMPLEQ_NEXT(next, entry);
3474 		}
3475 	}
3476 	return n;
3477 }
3478 
3479 static const struct got_error *
3480 tree_entry_path(char **path, struct tog_parent_trees *parents,
3481     struct got_tree_entry *te)
3482 {
3483 	const struct got_error *err = NULL;
3484 	struct tog_parent_tree *pt;
3485 	size_t len = 2; /* for leading slash and NUL */
3486 
3487 	TAILQ_FOREACH(pt, parents, entry)
3488 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3489 	if (te)
3490 		len += strlen(te->name);
3491 
3492 	*path = calloc(1, len);
3493 	if (path == NULL)
3494 		return got_error_from_errno("calloc");
3495 
3496 	(*path)[0] = '/';
3497 	pt = TAILQ_LAST(parents, tog_parent_trees);
3498 	while (pt) {
3499 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3500 			err = got_error(GOT_ERR_NO_SPACE);
3501 			goto done;
3502 		}
3503 		if (strlcat(*path, "/", len) >= len) {
3504 			err = got_error(GOT_ERR_NO_SPACE);
3505 			goto done;
3506 		}
3507 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3508 	}
3509 	if (te) {
3510 		if (strlcat(*path, te->name, len) >= len) {
3511 			err = got_error(GOT_ERR_NO_SPACE);
3512 			goto done;
3513 		}
3514 	}
3515 done:
3516 	if (err) {
3517 		free(*path);
3518 		*path = NULL;
3519 	}
3520 	return err;
3521 }
3522 
3523 static const struct got_error *
3524 blame_tree_entry(struct tog_view **new_view, int begin_x,
3525     struct got_tree_entry *te, struct tog_parent_trees *parents,
3526     struct got_object_id *commit_id, struct got_reflist_head *refs,
3527     struct got_repository *repo)
3528 {
3529 	const struct got_error *err = NULL;
3530 	char *path;
3531 	struct tog_view *blame_view;
3532 
3533 	err = tree_entry_path(&path, parents, te);
3534 	if (err)
3535 		return err;
3536 
3537 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3538 	if (blame_view == NULL)
3539 		return got_error_from_errno("view_open");
3540 
3541 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3542 	if (err) {
3543 		view_close(blame_view);
3544 		free(path);
3545 	} else
3546 		*new_view = blame_view;
3547 	return err;
3548 }
3549 
3550 static const struct got_error *
3551 log_tree_entry(struct tog_view **new_view, int begin_x,
3552     struct got_tree_entry *te, struct tog_parent_trees *parents,
3553     struct got_object_id *commit_id, struct got_reflist_head *refs,
3554     struct got_repository *repo)
3555 {
3556 	struct tog_view *log_view;
3557 	const struct got_error *err = NULL;
3558 	char *path;
3559 
3560 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3561 	if (log_view == NULL)
3562 		return got_error_from_errno("view_open");
3563 
3564 	err = tree_entry_path(&path, parents, te);
3565 	if (err)
3566 		return err;
3567 
3568 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3569 	if (err)
3570 		view_close(log_view);
3571 	else
3572 		*new_view = log_view;
3573 	free(path);
3574 	return err;
3575 }
3576 
3577 static const struct got_error *
3578 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3579     struct got_object_id *commit_id, struct got_reflist_head *refs,
3580     struct got_repository *repo)
3581 {
3582 	const struct got_error *err = NULL;
3583 	char *commit_id_str = NULL;
3584 	struct tog_tree_view_state *s = &view->state.tree;
3585 
3586 	TAILQ_INIT(&s->parents);
3587 
3588 	err = got_object_id_str(&commit_id_str, commit_id);
3589 	if (err != NULL)
3590 		goto done;
3591 
3592 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3593 		err = got_error_from_errno("asprintf");
3594 		goto done;
3595 	}
3596 
3597 	s->root = s->tree = root;
3598 	s->entries = got_object_tree_get_entries(root);
3599 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3600 	s->commit_id = got_object_id_dup(commit_id);
3601 	if (s->commit_id == NULL) {
3602 		err = got_error_from_errno("got_object_id_dup");
3603 		goto done;
3604 	}
3605 	s->refs = refs;
3606 	s->repo = repo;
3607 
3608 	view->show = show_tree_view;
3609 	view->input = input_tree_view;
3610 	view->close = close_tree_view;
3611 done:
3612 	free(commit_id_str);
3613 	if (err) {
3614 		free(s->tree_label);
3615 		s->tree_label = NULL;
3616 	}
3617 	return err;
3618 }
3619 
3620 static const struct got_error *
3621 close_tree_view(struct tog_view *view)
3622 {
3623 	struct tog_tree_view_state *s = &view->state.tree;
3624 
3625 	free(s->tree_label);
3626 	s->tree_label = NULL;
3627 	free(s->commit_id);
3628 	s->commit_id = NULL;
3629 	while (!TAILQ_EMPTY(&s->parents)) {
3630 		struct tog_parent_tree *parent;
3631 		parent = TAILQ_FIRST(&s->parents);
3632 		TAILQ_REMOVE(&s->parents, parent, entry);
3633 		free(parent);
3634 
3635 	}
3636 	if (s->tree != s->root)
3637 		got_object_tree_close(s->tree);
3638 	got_object_tree_close(s->root);
3639 
3640 	return NULL;
3641 }
3642 
3643 static const struct got_error *
3644 show_tree_view(struct tog_view *view)
3645 {
3646 	const struct got_error *err = NULL;
3647 	struct tog_tree_view_state *s = &view->state.tree;
3648 	char *parent_path;
3649 
3650 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3651 	if (err)
3652 		return err;
3653 
3654 	err = draw_tree_entries(view, &s->first_displayed_entry,
3655 	    &s->last_displayed_entry, &s->selected_entry,
3656 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3657 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3658 	free(parent_path);
3659 
3660 	view_vborder(view);
3661 	return err;
3662 }
3663 
3664 static const struct got_error *
3665 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3666     struct tog_view **focus_view, struct tog_view *view, int ch)
3667 {
3668 	const struct got_error *err = NULL;
3669 	struct tog_tree_view_state *s = &view->state.tree;
3670 	struct tog_view *log_view;
3671 	int begin_x = 0, nscrolled;
3672 
3673 	switch (ch) {
3674 	case 'i':
3675 		s->show_ids = !s->show_ids;
3676 		break;
3677 	case 'l':
3678 		if (!s->selected_entry)
3679 			break;
3680 		if (view_is_parent_view(view))
3681 			begin_x = view_split_begin_x(view->begin_x);
3682 		err = log_tree_entry(&log_view, begin_x,
3683 		    s->selected_entry, &s->parents,
3684 		    s->commit_id, s->refs, s->repo);
3685 		if (view_is_parent_view(view)) {
3686 			err = view_close_child(view);
3687 			if (err)
3688 				return err;
3689 			err = view_set_child(view, log_view);
3690 			if (err) {
3691 				view_close(log_view);
3692 				break;
3693 			}
3694 			*focus_view = log_view;
3695 			view->child_focussed = 1;
3696 		} else
3697 			*new_view = log_view;
3698 		break;
3699 	case 'k':
3700 	case KEY_UP:
3701 		if (s->selected > 0) {
3702 			s->selected--;
3703 			if (s->selected == 0)
3704 				break;
3705 		}
3706 		if (s->selected > 0)
3707 			break;
3708 		tree_scroll_up(view, &s->first_displayed_entry, 1,
3709 		    s->entries, s->tree == s->root);
3710 		break;
3711 	case KEY_PPAGE:
3712 		tree_scroll_up(view, &s->first_displayed_entry,
3713 		    MAX(0, view->nlines - 4 - s->selected), s->entries,
3714 		    s->tree == s->root);
3715 		s->selected = 0;
3716 		if (SIMPLEQ_FIRST(&s->entries->head) ==
3717 		    s->first_displayed_entry && s->tree != s->root)
3718 			s->first_displayed_entry = NULL;
3719 		break;
3720 	case 'j':
3721 	case KEY_DOWN:
3722 		if (s->selected < s->ndisplayed - 1) {
3723 			s->selected++;
3724 			break;
3725 		}
3726 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry) == NULL)
3727 			/* can't scroll any further */
3728 			break;
3729 		tree_scroll_down(&s->first_displayed_entry, 1,
3730 		    s->last_displayed_entry, s->entries);
3731 		break;
3732 	case KEY_NPAGE:
3733 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3734 		    == NULL) {
3735 			/* can't scroll any further; move cursor down */
3736 			if (s->selected < s->ndisplayed - 1)
3737 				s->selected = s->ndisplayed - 1;
3738 			break;
3739 		}
3740 		nscrolled = tree_scroll_down(&s->first_displayed_entry,
3741 		    view->nlines, s->last_displayed_entry, s->entries);
3742 		if (nscrolled < view->nlines) {
3743 			int ndisplayed = 0;
3744 			struct got_tree_entry *te;
3745 			te = s->first_displayed_entry;
3746 			do {
3747 				ndisplayed++;
3748 				te = SIMPLEQ_NEXT(te, entry);
3749 			} while (te);
3750 			s->selected = ndisplayed - 1;
3751 		}
3752 		break;
3753 	case KEY_ENTER:
3754 	case '\r':
3755 	case KEY_BACKSPACE:
3756 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
3757 			struct tog_parent_tree *parent;
3758 			/* user selected '..' */
3759 			if (s->tree == s->root)
3760 				break;
3761 			parent = TAILQ_FIRST(&s->parents);
3762 			TAILQ_REMOVE(&s->parents, parent,
3763 			    entry);
3764 			got_object_tree_close(s->tree);
3765 			s->tree = parent->tree;
3766 			s->entries =
3767 			    got_object_tree_get_entries(s->tree);
3768 			s->first_displayed_entry =
3769 			    parent->first_displayed_entry;
3770 			s->selected_entry =
3771 			    parent->selected_entry;
3772 			s->selected = parent->selected;
3773 			free(parent);
3774 		} else if (S_ISDIR(s->selected_entry->mode)) {
3775 			struct tog_parent_tree *parent;
3776 			struct got_tree_object *child;
3777 			err = got_object_open_as_tree(&child,
3778 			    s->repo, s->selected_entry->id);
3779 			if (err)
3780 				break;
3781 			parent = calloc(1, sizeof(*parent));
3782 			if (parent == NULL) {
3783 				err = got_error_from_errno("calloc");
3784 				break;
3785 			}
3786 			parent->tree = s->tree;
3787 			parent->first_displayed_entry =
3788 			   s->first_displayed_entry;
3789 			parent->selected_entry = s->selected_entry;
3790 			parent->selected = s->selected;
3791 			TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3792 			s->tree = child;
3793 			s->entries =
3794 			    got_object_tree_get_entries(s->tree);
3795 			s->selected = 0;
3796 			s->first_displayed_entry = NULL;
3797 		} else if (S_ISREG(s->selected_entry->mode)) {
3798 			struct tog_view *blame_view;
3799 			int begin_x = view_is_parent_view(view) ?
3800 			    view_split_begin_x(view->begin_x) : 0;
3801 
3802 			err = blame_tree_entry(&blame_view, begin_x,
3803 			    s->selected_entry, &s->parents,
3804 			    s->commit_id, s->refs, s->repo);
3805 			if (err)
3806 				break;
3807 			if (view_is_parent_view(view)) {
3808 				err = view_close_child(view);
3809 				if (err)
3810 					return err;
3811 				err = view_set_child(view, blame_view);
3812 				if (err) {
3813 					view_close(blame_view);
3814 					break;
3815 				}
3816 				*focus_view = blame_view;
3817 				view->child_focussed = 1;
3818 			} else
3819 				*new_view = blame_view;
3820 		}
3821 		break;
3822 	case KEY_RESIZE:
3823 		if (s->selected > view->nlines)
3824 			s->selected = s->ndisplayed - 1;
3825 		break;
3826 	default:
3827 		break;
3828 	}
3829 
3830 	return err;
3831 }
3832 
3833 __dead static void
3834 usage_tree(void)
3835 {
3836 	endwin();
3837 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3838 	    getprogname());
3839 	exit(1);
3840 }
3841 
3842 static const struct got_error *
3843 cmd_tree(int argc, char *argv[])
3844 {
3845 	const struct got_error *error;
3846 	struct got_repository *repo = NULL;
3847 	struct got_reflist_head refs;
3848 	char *repo_path = NULL;
3849 	struct got_object_id *commit_id = NULL;
3850 	char *commit_id_arg = NULL;
3851 	struct got_commit_object *commit = NULL;
3852 	struct got_tree_object *tree = NULL;
3853 	int ch;
3854 	struct tog_view *view;
3855 
3856 	SIMPLEQ_INIT(&refs);
3857 
3858 #ifndef PROFILE
3859 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3860 	    NULL) == -1)
3861 		err(1, "pledge");
3862 #endif
3863 
3864 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3865 		switch (ch) {
3866 		case 'c':
3867 			commit_id_arg = optarg;
3868 			break;
3869 		default:
3870 			usage_tree();
3871 			/* NOTREACHED */
3872 		}
3873 	}
3874 
3875 	argc -= optind;
3876 	argv += optind;
3877 
3878 	if (argc == 0) {
3879 		struct got_worktree *worktree;
3880 		char *cwd = getcwd(NULL, 0);
3881 		if (cwd == NULL)
3882 			return got_error_from_errno("getcwd");
3883 		error = got_worktree_open(&worktree, cwd);
3884 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3885 			goto done;
3886 		if (worktree) {
3887 			free(cwd);
3888 			repo_path =
3889 			    strdup(got_worktree_get_repo_path(worktree));
3890 			got_worktree_close(worktree);
3891 		} else
3892 			repo_path = cwd;
3893 		if (repo_path == NULL) {
3894 			error = got_error_from_errno("strdup");
3895 			goto done;
3896 		}
3897 	} else if (argc == 1) {
3898 		repo_path = realpath(argv[0], NULL);
3899 		if (repo_path == NULL)
3900 			return got_error_from_errno2("realpath", argv[0]);
3901 	} else
3902 		usage_log();
3903 
3904 	init_curses();
3905 
3906 	error = got_repo_open(&repo, repo_path);
3907 	if (error != NULL)
3908 		goto done;
3909 
3910 	error = apply_unveil(got_repo_get_path(repo), NULL);
3911 	if (error)
3912 		goto done;
3913 
3914 	if (commit_id_arg == NULL)
3915 		error = get_head_commit_id(&commit_id, GOT_REF_HEAD, repo);
3916 	else
3917 		error = got_object_resolve_id_str(&commit_id, repo,
3918 		    commit_id_arg);
3919 	if (error != NULL)
3920 		goto done;
3921 
3922 	error = got_object_open_as_commit(&commit, repo, commit_id);
3923 	if (error != NULL)
3924 		goto done;
3925 
3926 	error = got_object_open_as_tree(&tree, repo,
3927 	    got_object_commit_get_tree_id(commit));
3928 	if (error != NULL)
3929 		goto done;
3930 
3931 	error = got_ref_list(&refs, repo);
3932 	if (error)
3933 		goto done;
3934 
3935 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3936 	if (view == NULL) {
3937 		error = got_error_from_errno("view_open");
3938 		goto done;
3939 	}
3940 	error = open_tree_view(view, tree, commit_id, &refs, repo);
3941 	if (error)
3942 		goto done;
3943 	error = view_loop(view);
3944 done:
3945 	free(repo_path);
3946 	free(commit_id);
3947 	if (commit)
3948 		got_object_commit_close(commit);
3949 	if (tree)
3950 		got_object_tree_close(tree);
3951 	if (repo)
3952 		got_repo_close(repo);
3953 	got_ref_list_free(&refs);
3954 	return error;
3955 }
3956 
3957 __dead static void
3958 usage(void)
3959 {
3960 	int i;
3961 
3962 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3963 	    "Available commands:\n", getprogname());
3964 	for (i = 0; i < nitems(tog_commands); i++) {
3965 		struct tog_cmd *cmd = &tog_commands[i];
3966 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3967 	}
3968 	exit(1);
3969 }
3970 
3971 static char **
3972 make_argv(const char *arg0, const char *arg1)
3973 {
3974 	char **argv;
3975 	int argc = (arg1 == NULL ? 1 : 2);
3976 
3977 	argv = calloc(argc, sizeof(char *));
3978 	if (argv == NULL)
3979 		err(1, "calloc");
3980 	argv[0] = strdup(arg0);
3981 	if (argv[0] == NULL)
3982 		err(1, "calloc");
3983 	if (arg1) {
3984 		argv[1] = strdup(arg1);
3985 		if (argv[1] == NULL)
3986 			err(1, "calloc");
3987 	}
3988 
3989 	return argv;
3990 }
3991 
3992 int
3993 main(int argc, char *argv[])
3994 {
3995 	const struct got_error *error = NULL;
3996 	struct tog_cmd *cmd = NULL;
3997 	int ch, hflag = 0;
3998 	char **cmd_argv = NULL;
3999 
4000 	setlocale(LC_CTYPE, "");
4001 
4002 	while ((ch = getopt(argc, argv, "h")) != -1) {
4003 		switch (ch) {
4004 		case 'h':
4005 			hflag = 1;
4006 			break;
4007 		default:
4008 			usage();
4009 			/* NOTREACHED */
4010 		}
4011 	}
4012 
4013 	argc -= optind;
4014 	argv += optind;
4015 	optind = 0;
4016 	optreset = 1;
4017 
4018 	if (argc == 0) {
4019 		if (hflag)
4020 			usage();
4021 		/* Build an argument vector which runs a default command. */
4022 		cmd = &tog_commands[0];
4023 		cmd_argv = make_argv(cmd->name, NULL);
4024 		argc = 1;
4025 	} else {
4026 		int i;
4027 
4028 		/* Did the user specific a command? */
4029 		for (i = 0; i < nitems(tog_commands); i++) {
4030 			if (strncmp(tog_commands[i].name, argv[0],
4031 			    strlen(argv[0])) == 0) {
4032 				cmd = &tog_commands[i];
4033 				if (hflag)
4034 					tog_commands[i].cmd_usage();
4035 				break;
4036 			}
4037 		}
4038 		if (cmd == NULL) {
4039 			/* Did the user specify a repository? */
4040 			char *repo_path = realpath(argv[0], NULL);
4041 			if (repo_path) {
4042 				struct got_repository *repo;
4043 				error = got_repo_open(&repo, repo_path);
4044 				if (error == NULL)
4045 					got_repo_close(repo);
4046 			} else
4047 				error = got_error_from_errno2("realpath",
4048 				    argv[0]);
4049 			if (error) {
4050 				if (hflag) {
4051 					fprintf(stderr, "%s: '%s' is not a "
4052 					    "known command\n", getprogname(),
4053 					    argv[0]);
4054 					usage();
4055 				}
4056 				fprintf(stderr, "%s: '%s' is neither a known "
4057 				    "command nor a path to a repository\n",
4058 				    getprogname(), argv[0]);
4059 				free(repo_path);
4060 				return 1;
4061 			}
4062 			cmd = &tog_commands[0];
4063 			cmd_argv = make_argv(cmd->name, repo_path);
4064 			argc = 2;
4065 			free(repo_path);
4066 		}
4067 	}
4068 
4069 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4070 	if (error)
4071 		goto done;
4072 done:
4073 	endwin();
4074 	free(cmd_argv);
4075 	if (error)
4076 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4077 	return 0;
4078 }