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, struct got_repository *repo)
1110 {
1111 	const struct got_error *err = NULL;
1112 	struct got_reference *head_ref;
1113 
1114 	*head_id = NULL;
1115 
1116 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0);
1117 	if (err)
1118 		return err;
1119 
1120 	err = got_ref_resolve(head_id, repo, head_ref);
1121 	got_ref_close(head_ref);
1122 	if (err) {
1123 		*head_id = NULL;
1124 		return err;
1125 	}
1126 
1127 	return NULL;
1128 }
1129 
1130 static const struct got_error *
1131 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1132     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1133     struct commit_queue *commits, int selected_idx, int limit,
1134     struct got_reflist_head *refs, const char *path, int commits_needed)
1135 {
1136 	const struct got_error *err = NULL;
1137 	struct commit_queue_entry *entry;
1138 	int ncommits, width;
1139 	int author_cols = 10;
1140 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1141 	char *refs_str = NULL;
1142 	wchar_t *wline;
1143 
1144 	entry = first;
1145 	ncommits = 0;
1146 	while (entry) {
1147 		if (ncommits == selected_idx) {
1148 			*selected = entry;
1149 			break;
1150 		}
1151 		entry = TAILQ_NEXT(entry, entry);
1152 		ncommits++;
1153 	}
1154 
1155 	if (*selected) {
1156 		err = got_object_id_str(&id_str, (*selected)->id);
1157 		if (err)
1158 			return err;
1159 		if (refs) {
1160 			err = build_refs_str(&refs_str, refs, (*selected)->id);
1161 			if (err)
1162 				goto done;
1163 		}
1164 	}
1165 
1166 	if (commits_needed == 0)
1167 		halfdelay(10); /* disable fast refresh */
1168 
1169 	if (asprintf(&ncommits_str, " [%d/%d] %s",
1170 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1171 	    commits_needed > 0 ? "loading... " :
1172 	    (refs_str ? refs_str : "")) == -1) {
1173 		err = got_error_from_errno("asprintf");
1174 		goto done;
1175 	}
1176 
1177 	if (path && strcmp(path, "/") != 0) {
1178 		if (asprintf(&header, "commit %s %s%s",
1179 		    id_str ? id_str : "........................................",
1180 		    path, ncommits_str) == -1) {
1181 			err = got_error_from_errno("asprintf");
1182 			header = NULL;
1183 			goto done;
1184 		}
1185 	} else if (asprintf(&header, "commit %s%s",
1186 	    id_str ? id_str : "........................................",
1187 	    ncommits_str) == -1) {
1188 		err = got_error_from_errno("asprintf");
1189 		header = NULL;
1190 		goto done;
1191 	}
1192 	err = format_line(&wline, &width, header, view->ncols);
1193 	if (err)
1194 		goto done;
1195 
1196 	werase(view->window);
1197 
1198 	if (view_needs_focus_indication(view))
1199 		wstandout(view->window);
1200 	waddwstr(view->window, wline);
1201 	while (width < view->ncols) {
1202 		waddch(view->window, ' ');
1203 		width++;
1204 	}
1205 	if (view_needs_focus_indication(view))
1206 		wstandend(view->window);
1207 	free(wline);
1208 	if (limit <= 1)
1209 		goto done;
1210 
1211 	/* Grow author column size if necessary. */
1212 	entry = first;
1213 	ncommits = 0;
1214 	while (entry) {
1215 		char *author;
1216 		wchar_t *wauthor;
1217 		int width;
1218 		if (ncommits >= limit - 1)
1219 			break;
1220 		author = strdup(got_object_commit_get_author(entry->commit));
1221 		if (author == NULL) {
1222 			err = got_error_from_errno("strdup");
1223 			goto done;
1224 		}
1225 		err = format_author(&wauthor, &width, author, COLS);
1226 		if (author_cols < width)
1227 			author_cols = width;
1228 		free(wauthor);
1229 		free(author);
1230 		entry = TAILQ_NEXT(entry, entry);
1231 	}
1232 
1233 	entry = first;
1234 	*last = first;
1235 	ncommits = 0;
1236 	while (entry) {
1237 		if (ncommits >= limit - 1)
1238 			break;
1239 		if (ncommits == selected_idx)
1240 			wstandout(view->window);
1241 		err = draw_commit(view, entry->commit, entry->id, refs,
1242 		    author_cols);
1243 		if (ncommits == selected_idx)
1244 			wstandend(view->window);
1245 		if (err)
1246 			break;
1247 		ncommits++;
1248 		*last = entry;
1249 		entry = TAILQ_NEXT(entry, entry);
1250 	}
1251 
1252 	view_vborder(view);
1253 done:
1254 	free(id_str);
1255 	free(refs_str);
1256 	free(ncommits_str);
1257 	free(header);
1258 	return err;
1259 }
1260 
1261 static void
1262 scroll_up(struct tog_view *view,
1263     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1264     struct commit_queue *commits)
1265 {
1266 	struct commit_queue_entry *entry;
1267 	int nscrolled = 0;
1268 
1269 	entry = TAILQ_FIRST(&commits->head);
1270 	if (*first_displayed_entry == entry)
1271 		return;
1272 
1273 	entry = *first_displayed_entry;
1274 	while (entry && nscrolled < maxscroll) {
1275 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1276 		if (entry) {
1277 			*first_displayed_entry = entry;
1278 			nscrolled++;
1279 		}
1280 	}
1281 }
1282 
1283 static const struct got_error *
1284 trigger_log_thread(int load_all, int *commits_needed, int *log_complete,
1285     pthread_cond_t *need_commits)
1286 {
1287 	int errcode;
1288 	int max_wait = 20;
1289 
1290 	halfdelay(1); /* fast refresh while loading commits */
1291 
1292 	while (*commits_needed > 0) {
1293 		if (*log_complete)
1294 			break;
1295 
1296 		/* Wake the log thread. */
1297 		errcode = pthread_cond_signal(need_commits);
1298 		if (errcode)
1299 			return got_error_set_errno(errcode,
1300 			    "pthread_cond_signal");
1301 		errcode = pthread_mutex_unlock(&tog_mutex);
1302 		if (errcode)
1303 			return got_error_set_errno(errcode,
1304 			    "pthread_mutex_unlock");
1305 		pthread_yield();
1306 		errcode = pthread_mutex_lock(&tog_mutex);
1307 		if (errcode)
1308 			return got_error_set_errno(errcode,
1309 			    "pthread_mutex_lock");
1310 
1311 		if (*commits_needed > 0 && (!load_all || --max_wait <= 0)) {
1312 			/*
1313 			 * Thread is not done yet; lose a key press
1314 			 * and let the user retry... this way the GUI
1315 			 * remains interactive while logging deep paths
1316 			 * with few commits in history.
1317 			 */
1318 			return NULL;
1319 		}
1320 	}
1321 
1322 	return NULL;
1323 }
1324 
1325 static const struct got_error *
1326 scroll_down(struct tog_view *view,
1327     struct commit_queue_entry **first_displayed_entry, int maxscroll,
1328     struct commit_queue_entry **last_displayed_entry,
1329     struct commit_queue *commits, int *log_complete, int *commits_needed,
1330     pthread_cond_t *need_commits)
1331 {
1332 	const struct got_error *err = NULL;
1333 	struct commit_queue_entry *pentry;
1334 	int nscrolled = 0;
1335 
1336 	if (*last_displayed_entry == NULL)
1337 		return NULL;
1338 
1339 	pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1340 	if (pentry == NULL && !*log_complete) {
1341 		/*
1342 		 * Ask the log thread for required amount of commits
1343 		 * plus some amount of pre-fetching.
1344 		 */
1345 		(*commits_needed) += maxscroll + 20;
1346 		err = trigger_log_thread(0, commits_needed, log_complete,
1347 		    need_commits);
1348 		if (err)
1349 			return err;
1350 	}
1351 
1352 	do {
1353 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1354 		if (pentry == NULL)
1355 			break;
1356 
1357 		*last_displayed_entry = pentry;
1358 
1359 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1360 		if (pentry == NULL)
1361 			break;
1362 		*first_displayed_entry = pentry;
1363 	} while (++nscrolled < maxscroll);
1364 
1365 	return err;
1366 }
1367 
1368 static const struct got_error *
1369 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1370     struct got_commit_object *commit, struct got_object_id *commit_id,
1371     struct tog_view *log_view, struct got_reflist_head *refs,
1372     struct got_repository *repo)
1373 {
1374 	const struct got_error *err;
1375 	struct got_object_qid *parent_id;
1376 	struct tog_view *diff_view;
1377 
1378 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1379 	if (diff_view == NULL)
1380 		return got_error_from_errno("view_open");
1381 
1382 	parent_id = SIMPLEQ_FIRST(got_object_commit_get_parent_ids(commit));
1383 	err = open_diff_view(diff_view, parent_id ? parent_id->id : NULL,
1384 	    commit_id, log_view, refs, repo);
1385 	if (err == NULL)
1386 		*new_view = diff_view;
1387 	return err;
1388 }
1389 
1390 static const struct got_error *
1391 browse_commit(struct tog_view **new_view, int begin_x,
1392     struct commit_queue_entry *entry, struct got_reflist_head *refs,
1393     struct got_repository *repo)
1394 {
1395 	const struct got_error *err = NULL;
1396 	struct got_tree_object *tree;
1397 	struct tog_view *tree_view;
1398 
1399 	err = got_object_open_as_tree(&tree, repo,
1400 	    got_object_commit_get_tree_id(entry->commit));
1401 	if (err)
1402 		return err;
1403 
1404 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1405 	if (tree_view == NULL)
1406 		return got_error_from_errno("view_open");
1407 
1408 	err = open_tree_view(tree_view, tree, entry->id, refs, repo);
1409 	if (err)
1410 		got_object_tree_close(tree);
1411 	else
1412 		*new_view = tree_view;
1413 	return err;
1414 }
1415 
1416 static void *
1417 log_thread(void *arg)
1418 {
1419 	const struct got_error *err = NULL;
1420 	int errcode = 0;
1421 	struct tog_log_thread_args *a = arg;
1422 	int done = 0;
1423 
1424 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1425 	if (err)
1426 		return (void *)err;
1427 
1428 	while (!done && !err) {
1429 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1430 		    a->in_repo_path);
1431 		if (err) {
1432 			if (err->code != GOT_ERR_ITER_COMPLETED)
1433 				return (void *)err;
1434 			err = NULL;
1435 			done = 1;
1436 		} else if (a->commits_needed > 0)
1437 			a->commits_needed--;
1438 
1439 		errcode = pthread_mutex_lock(&tog_mutex);
1440 		if (errcode) {
1441 			err = got_error_set_errno(errcode,
1442 			    "pthread_mutex_lock");
1443 			break;
1444 		} else if (*a->quit)
1445 			done = 1;
1446 		else if (*a->first_displayed_entry == NULL) {
1447 			*a->first_displayed_entry =
1448 			    TAILQ_FIRST(&a->commits->head);
1449 			*a->selected_entry = *a->first_displayed_entry;
1450 		}
1451 
1452 		if (done)
1453 			a->commits_needed = 0;
1454 		else if (a->commits_needed == 0) {
1455 			errcode = pthread_cond_wait(&a->need_commits,
1456 			    &tog_mutex);
1457 			if (errcode)
1458 				err = got_error_set_errno(errcode,
1459 				    "pthread_cond_wait");
1460 		}
1461 
1462 		errcode = pthread_mutex_unlock(&tog_mutex);
1463 		if (errcode && err == NULL)
1464 			err = got_error_set_errno(errcode,
1465 			    "pthread_mutex_unlock");
1466 	}
1467 	a->log_complete = 1;
1468 	return (void *)err;
1469 }
1470 
1471 static const struct got_error *
1472 stop_log_thread(struct tog_log_view_state *s)
1473 {
1474 	const struct got_error *err = NULL;
1475 	int errcode;
1476 
1477 	if (s->thread) {
1478 		s->quit = 1;
1479 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1480 		if (errcode)
1481 			return got_error_set_errno(errcode,
1482 			    "pthread_cond_signal");
1483 		errcode = pthread_mutex_unlock(&tog_mutex);
1484 		if (errcode)
1485 			return got_error_set_errno(errcode,
1486 			    "pthread_mutex_unlock");
1487 		errcode = pthread_join(s->thread, (void **)&err);
1488 		if (errcode)
1489 			return got_error_set_errno(errcode, "pthread_join");
1490 		errcode = pthread_mutex_lock(&tog_mutex);
1491 		if (errcode)
1492 			return got_error_set_errno(errcode,
1493 			    "pthread_mutex_lock");
1494 		s->thread = NULL;
1495 	}
1496 
1497 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1498 	if (errcode && err == NULL)
1499 		err = got_error_set_errno(errcode, "pthread_cond_destroy");
1500 
1501 	if (s->thread_args.repo) {
1502 		got_repo_close(s->thread_args.repo);
1503 		s->thread_args.repo = NULL;
1504 	}
1505 
1506 	if (s->thread_args.graph) {
1507 		got_commit_graph_close(s->thread_args.graph);
1508 		s->thread_args.graph = NULL;
1509 	}
1510 
1511 	return err;
1512 }
1513 
1514 static const struct got_error *
1515 close_log_view(struct tog_view *view)
1516 {
1517 	const struct got_error *err = NULL;
1518 	struct tog_log_view_state *s = &view->state.log;
1519 
1520 	err = stop_log_thread(s);
1521 	free_commits(&s->commits);
1522 	free(s->in_repo_path);
1523 	s->in_repo_path = NULL;
1524 	free(s->start_id);
1525 	s->start_id = NULL;
1526 	return err;
1527 }
1528 
1529 static const struct got_error *
1530 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1531     struct got_reflist_head *refs, struct got_repository *repo,
1532     const char *path, int check_disk)
1533 {
1534 	const struct got_error *err = NULL;
1535 	struct tog_log_view_state *s = &view->state.log;
1536 	struct got_repository *thread_repo = NULL;
1537 	struct got_commit_graph *thread_graph = NULL;
1538 	int errcode;
1539 
1540 	err = got_repo_map_path(&s->in_repo_path, repo, path, check_disk);
1541 	if (err != NULL)
1542 		goto done;
1543 
1544 	/* The commit queue only contains commits being displayed. */
1545 	TAILQ_INIT(&s->commits.head);
1546 	s->commits.ncommits = 0;
1547 
1548 	s->refs = refs;
1549 	s->repo = repo;
1550 	s->start_id = got_object_id_dup(start_id);
1551 	if (s->start_id == NULL) {
1552 		err = got_error_from_errno("got_object_id_dup");
1553 		goto done;
1554 	}
1555 
1556 	view->show = show_log_view;
1557 	view->input = input_log_view;
1558 	view->close = close_log_view;
1559 
1560 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1561 	if (err)
1562 		goto done;
1563 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1564 	    0, thread_repo);
1565 	if (err)
1566 		goto done;
1567 
1568 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1569 	if (errcode) {
1570 		err = got_error_set_errno(errcode, "pthread_cond_init");
1571 		goto done;
1572 	}
1573 
1574 	s->thread_args.commits_needed = view->nlines;
1575 	s->thread_args.graph = thread_graph;
1576 	s->thread_args.commits = &s->commits;
1577 	s->thread_args.in_repo_path = s->in_repo_path;
1578 	s->thread_args.start_id = s->start_id;
1579 	s->thread_args.repo = thread_repo;
1580 	s->thread_args.log_complete = 0;
1581 	s->thread_args.quit = &s->quit;
1582 	s->thread_args.view = view;
1583 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1584 	s->thread_args.selected_entry = &s->selected_entry;
1585 done:
1586 	if (err)
1587 		close_log_view(view);
1588 	return err;
1589 }
1590 
1591 static const struct got_error *
1592 show_log_view(struct tog_view *view)
1593 {
1594 	struct tog_log_view_state *s = &view->state.log;
1595 
1596 	if (s->thread == NULL) {
1597 		int errcode = pthread_create(&s->thread, NULL, log_thread,
1598 		    &s->thread_args);
1599 		if (errcode)
1600 			return got_error_set_errno(errcode, "pthread_create");
1601 	}
1602 
1603 	return draw_commits(view, &s->last_displayed_entry,
1604 	    &s->selected_entry, s->first_displayed_entry,
1605 	    &s->commits, s->selected, view->nlines, s->refs,
1606 	    s->in_repo_path, s->thread_args.commits_needed);
1607 }
1608 
1609 static const struct got_error *
1610 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1611     struct tog_view **focus_view, struct tog_view *view, int ch)
1612 {
1613 	const struct got_error *err = NULL;
1614 	struct tog_log_view_state *s = &view->state.log;
1615 	char *parent_path;
1616 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1617 	int begin_x = 0;
1618 
1619 	switch (ch) {
1620 	case 'q':
1621 		s->quit = 1;
1622 		break;
1623 	case 'k':
1624 	case KEY_UP:
1625 	case '<':
1626 	case ',':
1627 		if (s->first_displayed_entry == NULL)
1628 			break;
1629 		if (s->selected > 0)
1630 			s->selected--;
1631 		if (s->selected > 0)
1632 			break;
1633 		scroll_up(view, &s->first_displayed_entry, 1,
1634 		    &s->commits);
1635 		break;
1636 	case KEY_PPAGE:
1637 	case CTRL('b'):
1638 		if (s->first_displayed_entry == NULL)
1639 			break;
1640 		if (TAILQ_FIRST(&s->commits.head) ==
1641 		    s->first_displayed_entry) {
1642 			s->selected = 0;
1643 			break;
1644 		}
1645 		scroll_up(view, &s->first_displayed_entry,
1646 		    view->nlines, &s->commits);
1647 		break;
1648 	case 'j':
1649 	case KEY_DOWN:
1650 	case '>':
1651 	case '.':
1652 		if (s->first_displayed_entry == NULL)
1653 			break;
1654 		if (s->selected < MIN(view->nlines - 2,
1655 		    s->commits.ncommits - 1)) {
1656 			s->selected++;
1657 			break;
1658 		}
1659 		err = scroll_down(view, &s->first_displayed_entry, 1,
1660 		    &s->last_displayed_entry, &s->commits,
1661 		    &s->thread_args.log_complete,
1662 		    &s->thread_args.commits_needed,
1663 		    &s->thread_args.need_commits);
1664 		break;
1665 	case KEY_NPAGE:
1666 	case CTRL('f'): {
1667 		struct commit_queue_entry *first;
1668 		first = s->first_displayed_entry;
1669 		if (first == NULL)
1670 			break;
1671 		err = scroll_down(view, &s->first_displayed_entry,
1672 		    view->nlines, &s->last_displayed_entry,
1673 		    &s->commits, &s->thread_args.log_complete,
1674 		    &s->thread_args.commits_needed,
1675 		    &s->thread_args.need_commits);
1676 		if (first == s->first_displayed_entry &&
1677 		    s->selected < MIN(view->nlines - 2,
1678 		    s->commits.ncommits - 1)) {
1679 			/* can't scroll further down */
1680 			s->selected = MIN(view->nlines - 2,
1681 			    s->commits.ncommits - 1);
1682 		}
1683 		err = NULL;
1684 		break;
1685 	}
1686 	case KEY_RESIZE:
1687 		if (s->selected > view->nlines - 2)
1688 			s->selected = view->nlines - 2;
1689 		if (s->selected > s->commits.ncommits - 1)
1690 			s->selected = s->commits.ncommits - 1;
1691 		break;
1692 	case KEY_ENTER:
1693 	case ' ':
1694 	case '\r':
1695 		if (s->selected_entry == NULL)
1696 			break;
1697 		if (view_is_parent_view(view))
1698 			begin_x = view_split_begin_x(view->begin_x);
1699 		err = open_diff_view_for_commit(&diff_view, begin_x,
1700 		    s->selected_entry->commit, s->selected_entry->id,
1701 		    view, s->refs, s->repo);
1702 		if (err)
1703 			break;
1704 		if (view_is_parent_view(view)) {
1705 			err = view_close_child(view);
1706 			if (err)
1707 				return err;
1708 			err = view_set_child(view, diff_view);
1709 			if (err) {
1710 				view_close(diff_view);
1711 				break;
1712 			}
1713 			*focus_view = diff_view;
1714 			view->child_focussed = 1;
1715 		} else
1716 			*new_view = diff_view;
1717 		break;
1718 	case 't':
1719 		if (s->selected_entry == NULL)
1720 			break;
1721 		if (view_is_parent_view(view))
1722 			begin_x = view_split_begin_x(view->begin_x);
1723 		err = browse_commit(&tree_view, begin_x,
1724 		    s->selected_entry, s->refs, s->repo);
1725 		if (err)
1726 			break;
1727 		if (view_is_parent_view(view)) {
1728 			err = view_close_child(view);
1729 			if (err)
1730 				return err;
1731 			err = view_set_child(view, tree_view);
1732 			if (err) {
1733 				view_close(tree_view);
1734 				break;
1735 			}
1736 			*focus_view = tree_view;
1737 			view->child_focussed = 1;
1738 		} else
1739 			*new_view = tree_view;
1740 		break;
1741 	case KEY_BACKSPACE:
1742 		if (strcmp(s->in_repo_path, "/") == 0)
1743 			break;
1744 		parent_path = dirname(s->in_repo_path);
1745 		if (parent_path && strcmp(parent_path, ".") != 0) {
1746 			struct tog_view *lv;
1747 			err = stop_log_thread(s);
1748 			if (err)
1749 				return err;
1750 			lv = view_open(view->nlines, view->ncols,
1751 			    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1752 			if (lv == NULL)
1753 				return got_error_from_errno(
1754 				    "view_open");
1755 			err = open_log_view(lv, s->start_id, s->refs,
1756 			    s->repo, parent_path, 0);
1757 			if (err)
1758 				return err;;
1759 			if (view_is_parent_view(view))
1760 				*new_view = lv;
1761 			else {
1762 				view_set_child(view->parent, lv);
1763 				*focus_view = lv;
1764 			}
1765 			return NULL;
1766 		}
1767 		break;
1768 	default:
1769 		break;
1770 	}
1771 
1772 	return err;
1773 }
1774 
1775 static const struct got_error *
1776 apply_unveil(const char *repo_path, const char *worktree_path)
1777 {
1778 	const struct got_error *error;
1779 
1780 	if (repo_path && unveil(repo_path, "r") != 0)
1781 		return got_error_from_errno2("unveil", repo_path);
1782 
1783 	if (worktree_path && unveil(worktree_path, "rwc") != 0)
1784 		return got_error_from_errno2("unveil", worktree_path);
1785 
1786 	if (unveil("/tmp", "rwc") != 0)
1787 		return got_error_from_errno2("unveil", "/tmp");
1788 
1789 	error = got_privsep_unveil_exec_helpers();
1790 	if (error != NULL)
1791 		return error;
1792 
1793 	if (unveil(NULL, NULL) != 0)
1794 		return got_error_from_errno("unveil");
1795 
1796 	return NULL;
1797 }
1798 
1799 static void
1800 init_curses(void)
1801 {
1802 	initscr();
1803 	cbreak();
1804 	halfdelay(1); /* Do fast refresh while initial view is loading. */
1805 	noecho();
1806 	nonl();
1807 	intrflush(stdscr, FALSE);
1808 	keypad(stdscr, TRUE);
1809 	curs_set(0);
1810 	signal(SIGWINCH, tog_sigwinch);
1811 }
1812 
1813 static const struct got_error *
1814 cmd_log(int argc, char *argv[])
1815 {
1816 	const struct got_error *error;
1817 	struct got_repository *repo = NULL;
1818 	struct got_worktree *worktree = NULL;
1819 	struct got_reflist_head refs;
1820 	struct got_object_id *start_id = NULL;
1821 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1822 	char *start_commit = NULL;
1823 	int ch;
1824 	struct tog_view *view;
1825 
1826 	SIMPLEQ_INIT(&refs);
1827 
1828 #ifndef PROFILE
1829 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
1830 	    NULL) == -1)
1831 		err(1, "pledge");
1832 #endif
1833 
1834 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1835 		switch (ch) {
1836 		case 'c':
1837 			start_commit = optarg;
1838 			break;
1839 		case 'r':
1840 			repo_path = realpath(optarg, NULL);
1841 			if (repo_path == NULL)
1842 				err(1, "-r option");
1843 			break;
1844 		default:
1845 			usage_log();
1846 			/* NOTREACHED */
1847 		}
1848 	}
1849 
1850 	argc -= optind;
1851 	argv += optind;
1852 
1853 	cwd = getcwd(NULL, 0);
1854 	if (cwd == NULL) {
1855 		error = got_error_from_errno("getcwd");
1856 		goto done;
1857 	}
1858 	error = got_worktree_open(&worktree, cwd);
1859 	if (error && error->code != GOT_ERR_NOT_WORKTREE)
1860 		goto done;
1861 	error = NULL;
1862 
1863 	if (argc == 0) {
1864 		path = strdup("");
1865 		if (path == NULL) {
1866 			error = got_error_from_errno("strdup");
1867 			goto done;
1868 		}
1869 	} else if (argc == 1) {
1870 		if (worktree) {
1871 			error = got_worktree_resolve_path(&path, worktree,
1872 			    argv[0]);
1873 			if (error)
1874 				goto done;
1875 		} else {
1876 			path = strdup(argv[0]);
1877 			if (path == NULL) {
1878 				error = got_error_from_errno("strdup");
1879 				goto done;
1880 			}
1881 		}
1882 	} else
1883 		usage_log();
1884 
1885 	repo_path = worktree ?
1886 	    strdup(got_worktree_get_repo_path(worktree)) : strdup(cwd);
1887 	if (repo_path == NULL) {
1888 		error = got_error_from_errno("strdup");
1889 		goto done;
1890 	}
1891 
1892 	init_curses();
1893 
1894 	error = got_repo_open(&repo, repo_path);
1895 	if (error != NULL)
1896 		goto done;
1897 
1898 	error = apply_unveil(got_repo_get_path(repo),
1899 	    worktree ? got_worktree_get_root_path(worktree) : NULL);
1900 	if (error)
1901 		goto done;
1902 
1903 	if (start_commit == NULL)
1904 		error = get_head_commit_id(&start_id, repo);
1905 	else
1906 		error = got_object_resolve_id_str(&start_id, repo,
1907 		    start_commit);
1908 	if (error != NULL)
1909 		goto done;
1910 
1911 	error = got_ref_list(&refs, repo);
1912 	if (error)
1913 		goto done;
1914 
1915 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1916 	if (view == NULL) {
1917 		error = got_error_from_errno("view_open");
1918 		goto done;
1919 	}
1920 	error = open_log_view(view, start_id, &refs, repo, path, 1);
1921 	if (error)
1922 		goto done;
1923 	error = view_loop(view);
1924 done:
1925 	free(repo_path);
1926 	free(cwd);
1927 	free(path);
1928 	free(start_id);
1929 	if (repo)
1930 		got_repo_close(repo);
1931 	if (worktree)
1932 		got_worktree_close(worktree);
1933 	got_ref_list_free(&refs);
1934 	return error;
1935 }
1936 
1937 __dead static void
1938 usage_diff(void)
1939 {
1940 	endwin();
1941 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1942 	    getprogname());
1943 	exit(1);
1944 }
1945 
1946 static char *
1947 parse_next_line(FILE *f, size_t *len)
1948 {
1949 	char *line;
1950 	size_t linelen;
1951 	size_t lineno;
1952 	const char delim[3] = { '\0', '\0', '\0'};
1953 
1954 	line = fparseln(f, &linelen, &lineno, delim, 0);
1955 	if (len)
1956 		*len = linelen;
1957 	return line;
1958 }
1959 
1960 static const struct got_error *
1961 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1962     int *last_displayed_line, int *eof, int max_lines,
1963     char *header)
1964 {
1965 	const struct got_error *err;
1966 	int nlines = 0, nprinted = 0;
1967 	char *line;
1968 	size_t len;
1969 	wchar_t *wline;
1970 	int width;
1971 
1972 	rewind(f);
1973 	werase(view->window);
1974 
1975 	if (header) {
1976 		err = format_line(&wline, &width, header, view->ncols);
1977 		if (err) {
1978 			return err;
1979 		}
1980 
1981 		if (view_needs_focus_indication(view))
1982 			wstandout(view->window);
1983 		waddwstr(view->window, wline);
1984 		if (view_needs_focus_indication(view))
1985 			wstandend(view->window);
1986 		if (width < view->ncols)
1987 			waddch(view->window, '\n');
1988 
1989 		if (max_lines <= 1)
1990 			return NULL;
1991 		max_lines--;
1992 	}
1993 
1994 	*eof = 0;
1995 	while (nprinted < max_lines) {
1996 		line = parse_next_line(f, &len);
1997 		if (line == NULL) {
1998 			*eof = 1;
1999 			break;
2000 		}
2001 		if (++nlines < *first_displayed_line) {
2002 			free(line);
2003 			continue;
2004 		}
2005 
2006 		err = format_line(&wline, &width, line, view->ncols);
2007 		if (err) {
2008 			free(line);
2009 			return err;
2010 		}
2011 		waddwstr(view->window, wline);
2012 		if (width < view->ncols)
2013 			waddch(view->window, '\n');
2014 		if (++nprinted == 1)
2015 			*first_displayed_line = nlines;
2016 		free(line);
2017 		free(wline);
2018 		wline = NULL;
2019 	}
2020 	*last_displayed_line = nlines;
2021 
2022 	view_vborder(view);
2023 
2024 	if (*eof) {
2025 		while (nprinted < view->nlines) {
2026 			waddch(view->window, '\n');
2027 			nprinted++;
2028 		}
2029 
2030 		err = format_line(&wline, &width, TOG_EOF_STRING, view->ncols);
2031 		if (err) {
2032 			return err;
2033 		}
2034 
2035 		wstandout(view->window);
2036 		waddwstr(view->window, wline);
2037 		wstandend(view->window);
2038 	}
2039 
2040 	return NULL;
2041 }
2042 
2043 static char *
2044 get_datestr(time_t *time, char *datebuf)
2045 {
2046 	char *p, *s = ctime_r(time, datebuf);
2047 	p = strchr(s, '\n');
2048 	if (p)
2049 		*p = '\0';
2050 	return s;
2051 }
2052 
2053 static const struct got_error *
2054 write_commit_info(struct got_object_id *commit_id,
2055     struct got_reflist_head *refs, struct got_repository *repo, FILE *outfile)
2056 {
2057 	const struct got_error *err = NULL;
2058 	char datebuf[26];
2059 	struct got_commit_object *commit;
2060 	char *id_str = NULL;
2061 	time_t committer_time;
2062 	const char *author, *committer;
2063 	char *refs_str = NULL;
2064 
2065 	if (refs) {
2066 		err = build_refs_str(&refs_str, refs, commit_id);
2067 		if (err)
2068 			return err;
2069 	}
2070 
2071 	err = got_object_open_as_commit(&commit, repo, commit_id);
2072 	if (err)
2073 		return err;
2074 
2075 	err = got_object_id_str(&id_str, commit_id);
2076 	if (err) {
2077 		err = got_error_from_errno("got_object_id_str");
2078 		goto done;
2079 	}
2080 
2081 	if (fprintf(outfile, "commit %s%s%s%s\n", id_str, refs_str ? " (" : "",
2082 	    refs_str ? refs_str : "", refs_str ? ")" : "") < 0) {
2083 		err = got_error_from_errno("fprintf");
2084 		goto done;
2085 	}
2086 	if (fprintf(outfile, "from: %s\n",
2087 	    got_object_commit_get_author(commit)) < 0) {
2088 		err = got_error_from_errno("fprintf");
2089 		goto done;
2090 	}
2091 	committer_time = got_object_commit_get_committer_time(commit);
2092 	if (fprintf(outfile, "date: %s UTC\n",
2093 	    get_datestr(&committer_time, datebuf)) < 0) {
2094 		err = got_error_from_errno("fprintf");
2095 		goto done;
2096 	}
2097 	author = got_object_commit_get_author(commit);
2098 	committer = got_object_commit_get_committer(commit);
2099 	if (strcmp(author, committer) != 0 &&
2100 	    fprintf(outfile, "via: %s\n", committer) < 0) {
2101 		err = got_error_from_errno("fprintf");
2102 		goto done;
2103 	}
2104 	if (fprintf(outfile, "%s\n",
2105 	    got_object_commit_get_logmsg(commit)) < 0) {
2106 		err = got_error_from_errno("fprintf");
2107 		goto done;
2108 	}
2109 done:
2110 	free(id_str);
2111 	free(refs_str);
2112 	got_object_commit_close(commit);
2113 	return err;
2114 }
2115 
2116 static const struct got_error *
2117 create_diff(struct tog_diff_view_state *s)
2118 {
2119 	const struct got_error *err = NULL;
2120 	FILE *f = NULL;
2121 	int obj_type;
2122 
2123 	f = got_opentemp();
2124 	if (f == NULL) {
2125 		err = got_error_from_errno("got_opentemp");
2126 		goto done;
2127 	}
2128 	if (s->f && fclose(s->f) != 0) {
2129 		err = got_error_from_errno("fclose");
2130 		goto done;
2131 	}
2132 	s->f = f;
2133 
2134 	if (s->id1)
2135 		err = got_object_get_type(&obj_type, s->repo, s->id1);
2136 	else
2137 		err = got_object_get_type(&obj_type, s->repo, s->id2);
2138 	if (err)
2139 		goto done;
2140 
2141 	switch (obj_type) {
2142 	case GOT_OBJ_TYPE_BLOB:
2143 		err = got_diff_objects_as_blobs(s->id1, s->id2, NULL, NULL,
2144 		    s->diff_context, s->repo, f);
2145 		break;
2146 	case GOT_OBJ_TYPE_TREE:
2147 		err = got_diff_objects_as_trees(s->id1, s->id2, "", "",
2148 		    s->diff_context, s->repo, f);
2149 		break;
2150 	case GOT_OBJ_TYPE_COMMIT: {
2151 		const struct got_object_id_queue *parent_ids;
2152 		struct got_object_qid *pid;
2153 		struct got_commit_object *commit2;
2154 
2155 		err = got_object_open_as_commit(&commit2, s->repo, s->id2);
2156 		if (err)
2157 			break;
2158 		/* Show commit info if we're diffing to a parent/root commit. */
2159 		if (s->id1 == NULL)
2160 			write_commit_info(s->id2, s->refs, s->repo, f);
2161 		else {
2162 			parent_ids = got_object_commit_get_parent_ids(commit2);
2163 			SIMPLEQ_FOREACH(pid, parent_ids, entry) {
2164 				if (got_object_id_cmp(s->id1, pid->id) == 0) {
2165 					write_commit_info(s->id2, s->refs,
2166 					    s->repo, f);
2167 					break;
2168 				}
2169 			}
2170 		}
2171 		got_object_commit_close(commit2);
2172 
2173 		err = got_diff_objects_as_commits(s->id1, s->id2,
2174 		    s->diff_context, s->repo, f);
2175 		break;
2176 	}
2177 	default:
2178 		err = got_error(GOT_ERR_OBJ_TYPE);
2179 		break;
2180 	}
2181 done:
2182 	if (f && fflush(f) != 0 && err == NULL)
2183 		err = got_error_from_errno("fflush");
2184 	return err;
2185 }
2186 
2187 static void
2188 diff_view_indicate_progress(struct tog_view *view)
2189 {
2190 	mvwaddstr(view->window, 0, 0, "diffing...");
2191 	update_panels();
2192 	doupdate();
2193 }
2194 
2195 static const struct got_error *
2196 open_diff_view(struct tog_view *view, struct got_object_id *id1,
2197     struct got_object_id *id2, struct tog_view *log_view,
2198     struct got_reflist_head *refs, struct got_repository *repo)
2199 {
2200 	const struct got_error *err;
2201 
2202 	if (id1 != NULL && id2 != NULL) {
2203 	    int type1, type2;
2204 	    err = got_object_get_type(&type1, repo, id1);
2205 	    if (err)
2206 		return err;
2207 	    err = got_object_get_type(&type2, repo, id2);
2208 	    if (err)
2209 		return err;
2210 
2211 	    if (type1 != type2)
2212 		return got_error(GOT_ERR_OBJ_TYPE);
2213 	}
2214 
2215 	if (id1) {
2216 		view->state.diff.id1 = got_object_id_dup(id1);
2217 		if (view->state.diff.id1 == NULL)
2218 			return got_error_from_errno("got_object_id_dup");
2219 	} else
2220 		view->state.diff.id1 = NULL;
2221 
2222 	view->state.diff.id2 = got_object_id_dup(id2);
2223 	if (view->state.diff.id2 == NULL) {
2224 		free(view->state.diff.id1);
2225 		view->state.diff.id1 = NULL;
2226 		return got_error_from_errno("got_object_id_dup");
2227 	}
2228 	view->state.diff.f = NULL;
2229 	view->state.diff.first_displayed_line = 1;
2230 	view->state.diff.last_displayed_line = view->nlines;
2231 	view->state.diff.diff_context = 3;
2232 	view->state.diff.log_view = log_view;
2233 	view->state.diff.repo = repo;
2234 	view->state.diff.refs = refs;
2235 
2236 	if (log_view && view_is_splitscreen(view))
2237 		show_log_view(log_view); /* draw vborder */
2238 	diff_view_indicate_progress(view);
2239 
2240 	err = create_diff(&view->state.diff);
2241 	if (err) {
2242 		free(view->state.diff.id1);
2243 		view->state.diff.id1 = NULL;
2244 		free(view->state.diff.id2);
2245 		view->state.diff.id2 = NULL;
2246 		return err;
2247 	}
2248 
2249 	view->show = show_diff_view;
2250 	view->input = input_diff_view;
2251 	view->close = close_diff_view;
2252 
2253 	return NULL;
2254 }
2255 
2256 static const struct got_error *
2257 close_diff_view(struct tog_view *view)
2258 {
2259 	const struct got_error *err = NULL;
2260 
2261 	free(view->state.diff.id1);
2262 	view->state.diff.id1 = NULL;
2263 	free(view->state.diff.id2);
2264 	view->state.diff.id2 = NULL;
2265 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
2266 		err = got_error_from_errno("fclose");
2267 	return err;
2268 }
2269 
2270 static const struct got_error *
2271 show_diff_view(struct tog_view *view)
2272 {
2273 	const struct got_error *err;
2274 	struct tog_diff_view_state *s = &view->state.diff;
2275 	char *id_str1 = NULL, *id_str2, *header;
2276 
2277 	if (s->id1) {
2278 		err = got_object_id_str(&id_str1, s->id1);
2279 		if (err)
2280 			return err;
2281 	}
2282 	err = got_object_id_str(&id_str2, s->id2);
2283 	if (err)
2284 		return err;
2285 
2286 	if (asprintf(&header, "diff %s %s",
2287 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
2288 		err = got_error_from_errno("asprintf");
2289 		free(id_str1);
2290 		free(id_str2);
2291 		return err;
2292 	}
2293 	free(id_str1);
2294 	free(id_str2);
2295 
2296 	return draw_file(view, s->f, &s->first_displayed_line,
2297 	    &s->last_displayed_line, &s->eof, view->nlines,
2298 	    header);
2299 }
2300 
2301 static const struct got_error *
2302 set_selected_commit(struct tog_diff_view_state *s,
2303     struct commit_queue_entry *entry)
2304 {
2305 	const struct got_error *err;
2306 	const struct got_object_id_queue *parent_ids;
2307 	struct got_commit_object *selected_commit;
2308 	struct got_object_qid *pid;
2309 
2310 	free(s->id2);
2311 	s->id2 = got_object_id_dup(entry->id);
2312 	if (s->id2 == NULL)
2313 		return got_error_from_errno("got_object_id_dup");
2314 
2315 	err = got_object_open_as_commit(&selected_commit, s->repo, entry->id);
2316 	if (err)
2317 		return err;
2318 	parent_ids = got_object_commit_get_parent_ids(selected_commit);
2319 	free(s->id1);
2320 	pid = SIMPLEQ_FIRST(parent_ids);
2321 	s->id1 = pid ? got_object_id_dup(pid->id) : NULL;
2322 	got_object_commit_close(selected_commit);
2323 	return NULL;
2324 }
2325 
2326 static const struct got_error *
2327 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
2328     struct tog_view **focus_view, struct tog_view *view, int ch)
2329 {
2330 	const struct got_error *err = NULL;
2331 	struct tog_diff_view_state *s = &view->state.diff;
2332 	struct tog_log_view_state *ls;
2333 	struct commit_queue_entry *entry;
2334 	int i;
2335 
2336 	switch (ch) {
2337 	case 'k':
2338 	case KEY_UP:
2339 		if (s->first_displayed_line > 1)
2340 			s->first_displayed_line--;
2341 		break;
2342 	case KEY_PPAGE:
2343 		if (s->first_displayed_line == 1)
2344 			break;
2345 		i = 0;
2346 		while (i++ < view->nlines - 1 &&
2347 		    s->first_displayed_line > 1)
2348 			s->first_displayed_line--;
2349 		break;
2350 	case 'j':
2351 	case KEY_DOWN:
2352 		if (!s->eof)
2353 			s->first_displayed_line++;
2354 		break;
2355 	case KEY_NPAGE:
2356 	case ' ':
2357 		if (s->eof)
2358 			break;
2359 		i = 0;
2360 		while (!s->eof && i++ < view->nlines - 1) {
2361 			char *line;
2362 			line = parse_next_line(s->f, NULL);
2363 			s->first_displayed_line++;
2364 			if (line == NULL)
2365 				break;
2366 		}
2367 		break;
2368 	case '[':
2369 		if (s->diff_context > 0) {
2370 			s->diff_context--;
2371 			diff_view_indicate_progress(view);
2372 			err = create_diff(s);
2373 		}
2374 		break;
2375 	case ']':
2376 		if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
2377 			s->diff_context++;
2378 			diff_view_indicate_progress(view);
2379 			err = create_diff(s);
2380 		}
2381 		break;
2382 	case '<':
2383 	case ',':
2384 		if (s->log_view == NULL)
2385 			break;
2386 		ls = &s->log_view->state.log;
2387 		entry = TAILQ_PREV(ls->selected_entry,
2388 		    commit_queue_head, entry);
2389 		if (entry == NULL)
2390 			break;
2391 
2392 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2393 		    KEY_UP);
2394 		if (err)
2395 			break;
2396 
2397 		err = set_selected_commit(s, entry);
2398 		if (err)
2399 			break;
2400 
2401 		s->first_displayed_line = 1;
2402 		s->last_displayed_line = view->nlines;
2403 
2404 		diff_view_indicate_progress(view);
2405 		err = create_diff(s);
2406 		break;
2407 	case '>':
2408 	case '.':
2409 		if (s->log_view == NULL)
2410 			break;
2411 		ls = &s->log_view->state.log;
2412 
2413 		if (TAILQ_NEXT(ls->selected_entry, entry) == NULL) {
2414 			ls->thread_args.commits_needed++;
2415 
2416 			/* Display "loading..." in log view. */
2417 			show_log_view(s->log_view);
2418 			update_panels();
2419 			doupdate();
2420 
2421 			err = trigger_log_thread(1 /* load_all */,
2422 			    &ls->thread_args.commits_needed,
2423 			    &ls->thread_args.log_complete,
2424 			    &ls->thread_args.need_commits);
2425 			if (err)
2426 				break;
2427 		}
2428 		err = input_log_view(NULL, NULL, NULL, s->log_view,
2429 		    KEY_DOWN);
2430 		if (err)
2431 			break;
2432 
2433 		entry = TAILQ_NEXT(ls->selected_entry, entry);
2434 		if (entry == NULL)
2435 			break;
2436 
2437 		err = set_selected_commit(s, entry);
2438 		if (err)
2439 			break;
2440 
2441 		s->first_displayed_line = 1;
2442 		s->last_displayed_line = view->nlines;
2443 
2444 		diff_view_indicate_progress(view);
2445 		err = create_diff(s);
2446 		break;
2447 	default:
2448 		break;
2449 	}
2450 
2451 	return err;
2452 }
2453 
2454 static const struct got_error *
2455 cmd_diff(int argc, char *argv[])
2456 {
2457 	const struct got_error *error = NULL;
2458 	struct got_repository *repo = NULL;
2459 	struct got_reflist_head refs;
2460 	struct got_object_id *id1 = NULL, *id2 = NULL;
2461 	char *repo_path = NULL;
2462 	char *id_str1 = NULL, *id_str2 = NULL;
2463 	int ch;
2464 	struct tog_view *view;
2465 
2466 	SIMPLEQ_INIT(&refs);
2467 
2468 #ifndef PROFILE
2469 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
2470 	    NULL) == -1)
2471 		err(1, "pledge");
2472 #endif
2473 
2474 	while ((ch = getopt(argc, argv, "")) != -1) {
2475 		switch (ch) {
2476 		default:
2477 			usage_diff();
2478 			/* NOTREACHED */
2479 		}
2480 	}
2481 
2482 	argc -= optind;
2483 	argv += optind;
2484 
2485 	if (argc == 0) {
2486 		usage_diff(); /* TODO show local worktree changes */
2487 	} else if (argc == 2) {
2488 		repo_path = getcwd(NULL, 0);
2489 		if (repo_path == NULL)
2490 			return got_error_from_errno("getcwd");
2491 		id_str1 = argv[0];
2492 		id_str2 = argv[1];
2493 	} else if (argc == 3) {
2494 		repo_path = realpath(argv[0], NULL);
2495 		if (repo_path == NULL)
2496 			return got_error_from_errno2("realpath", argv[0]);
2497 		id_str1 = argv[1];
2498 		id_str2 = argv[2];
2499 	} else
2500 		usage_diff();
2501 
2502 	init_curses();
2503 
2504 	error = got_repo_open(&repo, repo_path);
2505 	if (error)
2506 		goto done;
2507 
2508 	error = apply_unveil(got_repo_get_path(repo), NULL);
2509 	if (error)
2510 		goto done;
2511 
2512 	error = got_object_resolve_id_str(&id1, repo, id_str1);
2513 	if (error)
2514 		goto done;
2515 
2516 	error = got_object_resolve_id_str(&id2, repo, id_str2);
2517 	if (error)
2518 		goto done;
2519 
2520 	error = got_ref_list(&refs, repo);
2521 	if (error)
2522 		goto done;
2523 
2524 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2525 	if (view == NULL) {
2526 		error = got_error_from_errno("view_open");
2527 		goto done;
2528 	}
2529 	error = open_diff_view(view, id1, id2, NULL, &refs, repo);
2530 	if (error)
2531 		goto done;
2532 	error = view_loop(view);
2533 done:
2534 	free(repo_path);
2535 	got_repo_close(repo);
2536 	got_ref_list_free(&refs);
2537 	return error;
2538 }
2539 
2540 __dead static void
2541 usage_blame(void)
2542 {
2543 	endwin();
2544 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2545 	    getprogname());
2546 	exit(1);
2547 }
2548 
2549 struct tog_blame_line {
2550 	int annotated;
2551 	struct got_object_id *id;
2552 };
2553 
2554 static const struct got_error *
2555 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2556     const char *path, struct tog_blame_line *lines, int nlines,
2557     int blame_complete, int selected_line, int *first_displayed_line,
2558     int *last_displayed_line, int *eof, int max_lines)
2559 {
2560 	const struct got_error *err;
2561 	int lineno = 0, nprinted = 0;
2562 	char *line;
2563 	size_t len;
2564 	wchar_t *wline;
2565 	int width, wlimit;
2566 	struct tog_blame_line *blame_line;
2567 	struct got_object_id *prev_id = NULL;
2568 	char *id_str;
2569 
2570 	err = got_object_id_str(&id_str, id);
2571 	if (err)
2572 		return err;
2573 
2574 	rewind(f);
2575 	werase(view->window);
2576 
2577 	if (asprintf(&line, "commit %s", id_str) == -1) {
2578 		err = got_error_from_errno("asprintf");
2579 		free(id_str);
2580 		return err;
2581 	}
2582 
2583 	err = format_line(&wline, &width, line, view->ncols);
2584 	free(line);
2585 	line = NULL;
2586 	if (view_needs_focus_indication(view))
2587 		wstandout(view->window);
2588 	waddwstr(view->window, wline);
2589 	if (view_needs_focus_indication(view))
2590 		wstandend(view->window);
2591 	free(wline);
2592 	wline = NULL;
2593 	if (width < view->ncols)
2594 		waddch(view->window, '\n');
2595 
2596 	if (asprintf(&line, "[%d/%d] %s%s",
2597 	    *first_displayed_line - 1 + selected_line, nlines,
2598 	    blame_complete ? "" : "annotating... ", path) == -1) {
2599 		free(id_str);
2600 		return got_error_from_errno("asprintf");
2601 	}
2602 	free(id_str);
2603 	err = format_line(&wline, &width, line, view->ncols);
2604 	free(line);
2605 	line = NULL;
2606 	if (err)
2607 		return err;
2608 	waddwstr(view->window, wline);
2609 	free(wline);
2610 	wline = NULL;
2611 	if (width < view->ncols)
2612 		waddch(view->window, '\n');
2613 
2614 	*eof = 0;
2615 	while (nprinted < max_lines - 2) {
2616 		line = parse_next_line(f, &len);
2617 		if (line == NULL) {
2618 			*eof = 1;
2619 			break;
2620 		}
2621 		if (++lineno < *first_displayed_line) {
2622 			free(line);
2623 			continue;
2624 		}
2625 
2626 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2627 		err = format_line(&wline, &width, line, wlimit);
2628 		if (err) {
2629 			free(line);
2630 			return err;
2631 		}
2632 
2633 		if (view->focussed && nprinted == selected_line - 1)
2634 			wstandout(view->window);
2635 
2636 		blame_line = &lines[lineno - 1];
2637 		if (blame_line->annotated && prev_id &&
2638 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2639 			waddstr(view->window, "         ");
2640 		else if (blame_line->annotated) {
2641 			char *id_str;
2642 			err = got_object_id_str(&id_str, blame_line->id);
2643 			if (err) {
2644 				free(line);
2645 				free(wline);
2646 				return err;
2647 			}
2648 			wprintw(view->window, "%.8s ", id_str);
2649 			free(id_str);
2650 			prev_id = blame_line->id;
2651 		} else {
2652 			waddstr(view->window, "........ ");
2653 			prev_id = NULL;
2654 		}
2655 
2656 		waddwstr(view->window, wline);
2657 		while (width < wlimit) {
2658 			waddch(view->window, ' ');
2659 			width++;
2660 		}
2661 		if (view->focussed && nprinted == selected_line - 1)
2662 			wstandend(view->window);
2663 		if (++nprinted == 1)
2664 			*first_displayed_line = lineno;
2665 		free(line);
2666 		free(wline);
2667 		wline = NULL;
2668 	}
2669 	*last_displayed_line = lineno;
2670 
2671 	view_vborder(view);
2672 
2673 	return NULL;
2674 }
2675 
2676 static const struct got_error *
2677 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2678 {
2679 	const struct got_error *err = NULL;
2680 	struct tog_blame_cb_args *a = arg;
2681 	struct tog_blame_line *line;
2682 	int errcode;
2683 
2684 	if (nlines != a->nlines ||
2685 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2686 		return got_error(GOT_ERR_RANGE);
2687 
2688 	errcode = pthread_mutex_lock(&tog_mutex);
2689 	if (errcode)
2690 		return got_error_set_errno(errcode, "pthread_mutex_lock");
2691 
2692 	if (*a->quit) {	/* user has quit the blame view */
2693 		err = got_error(GOT_ERR_ITER_COMPLETED);
2694 		goto done;
2695 	}
2696 
2697 	if (lineno == -1)
2698 		goto done; /* no change in this commit */
2699 
2700 	line = &a->lines[lineno - 1];
2701 	if (line->annotated)
2702 		goto done;
2703 
2704 	line->id = got_object_id_dup(id);
2705 	if (line->id == NULL) {
2706 		err = got_error_from_errno("got_object_id_dup");
2707 		goto done;
2708 	}
2709 	line->annotated = 1;
2710 done:
2711 	errcode = pthread_mutex_unlock(&tog_mutex);
2712 	if (errcode)
2713 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2714 	return err;
2715 }
2716 
2717 static void *
2718 blame_thread(void *arg)
2719 {
2720 	const struct got_error *err;
2721 	struct tog_blame_thread_args *ta = arg;
2722 	struct tog_blame_cb_args *a = ta->cb_args;
2723 	int errcode;
2724 
2725 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2726 	    blame_cb, ta->cb_args);
2727 
2728 	errcode = pthread_mutex_lock(&tog_mutex);
2729 	if (errcode)
2730 		return (void *)got_error_set_errno(errcode,
2731 		    "pthread_mutex_lock");
2732 
2733 	got_repo_close(ta->repo);
2734 	ta->repo = NULL;
2735 	*ta->complete = 1;
2736 
2737 	errcode = pthread_mutex_unlock(&tog_mutex);
2738 	if (errcode && err == NULL)
2739 		err = got_error_set_errno(errcode, "pthread_mutex_unlock");
2740 
2741 	return (void *)err;
2742 }
2743 
2744 static struct got_object_id *
2745 get_selected_commit_id(struct tog_blame_line *lines, int first_displayed_line,
2746     int selected_line)
2747 {
2748 	struct tog_blame_line *line;
2749 
2750 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2751 	if (!line->annotated)
2752 		return NULL;
2753 
2754 	return line->id;
2755 }
2756 
2757 static const struct got_error *
2758 stop_blame(struct tog_blame *blame)
2759 {
2760 	const struct got_error *err = NULL;
2761 	int i;
2762 
2763 	if (blame->thread) {
2764 		int errcode;
2765 		errcode = pthread_mutex_unlock(&tog_mutex);
2766 		if (errcode)
2767 			return got_error_set_errno(errcode,
2768 			    "pthread_mutex_unlock");
2769 		errcode = pthread_join(blame->thread, (void **)&err);
2770 		if (errcode)
2771 			return got_error_set_errno(errcode, "pthread_join");
2772 		errcode = pthread_mutex_lock(&tog_mutex);
2773 		if (errcode)
2774 			return got_error_set_errno(errcode,
2775 			    "pthread_mutex_lock");
2776 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2777 			err = NULL;
2778 		blame->thread = NULL;
2779 	}
2780 	if (blame->thread_args.repo) {
2781 		got_repo_close(blame->thread_args.repo);
2782 		blame->thread_args.repo = NULL;
2783 	}
2784 	if (blame->f) {
2785 		if (fclose(blame->f) != 0 && err == NULL)
2786 			err = got_error_from_errno("fclose");
2787 		blame->f = NULL;
2788 	}
2789 	if (blame->lines) {
2790 		for (i = 0; i < blame->nlines; i++)
2791 			free(blame->lines[i].id);
2792 		free(blame->lines);
2793 		blame->lines = NULL;
2794 	}
2795 	free(blame->cb_args.commit_id);
2796 	blame->cb_args.commit_id = NULL;
2797 
2798 	return err;
2799 }
2800 
2801 static const struct got_error *
2802 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2803     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2804     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2805     struct got_repository *repo)
2806 {
2807 	const struct got_error *err = NULL;
2808 	struct got_blob_object *blob = NULL;
2809 	struct got_repository *thread_repo = NULL;
2810 	struct got_object_id *obj_id = NULL;
2811 	int obj_type;
2812 
2813 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2814 	if (err)
2815 		return err;
2816 	if (obj_id == NULL)
2817 		return got_error(GOT_ERR_NO_OBJ);
2818 
2819 	err = got_object_get_type(&obj_type, repo, obj_id);
2820 	if (err)
2821 		goto done;
2822 
2823 	if (obj_type != GOT_OBJ_TYPE_BLOB) {
2824 		err = got_error(GOT_ERR_OBJ_TYPE);
2825 		goto done;
2826 	}
2827 
2828 	err = got_object_open_as_blob(&blob, repo, obj_id, 8192);
2829 	if (err)
2830 		goto done;
2831 	blame->f = got_opentemp();
2832 	if (blame->f == NULL) {
2833 		err = got_error_from_errno("got_opentemp");
2834 		goto done;
2835 	}
2836 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2837 	    blame->f, blob);
2838 	if (err)
2839 		goto done;
2840 
2841 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2842 	if (blame->lines == NULL) {
2843 		err = got_error_from_errno("calloc");
2844 		goto done;
2845 	}
2846 
2847 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2848 	if (err)
2849 		goto done;
2850 
2851 	blame->cb_args.view = view;
2852 	blame->cb_args.lines = blame->lines;
2853 	blame->cb_args.nlines = blame->nlines;
2854 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2855 	if (blame->cb_args.commit_id == NULL) {
2856 		err = got_error_from_errno("got_object_id_dup");
2857 		goto done;
2858 	}
2859 	blame->cb_args.quit = done;
2860 
2861 	blame->thread_args.path = path;
2862 	blame->thread_args.repo = thread_repo;
2863 	blame->thread_args.cb_args = &blame->cb_args;
2864 	blame->thread_args.complete = blame_complete;
2865 	*blame_complete = 0;
2866 
2867 done:
2868 	if (blob)
2869 		got_object_blob_close(blob);
2870 	free(obj_id);
2871 	if (err)
2872 		stop_blame(blame);
2873 	return err;
2874 }
2875 
2876 static const struct got_error *
2877 open_blame_view(struct tog_view *view, char *path,
2878     struct got_object_id *commit_id, struct got_reflist_head *refs,
2879     struct got_repository *repo)
2880 {
2881 	const struct got_error *err = NULL;
2882 	struct tog_blame_view_state *s = &view->state.blame;
2883 
2884 	SIMPLEQ_INIT(&s->blamed_commits);
2885 
2886 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2887 	if (err)
2888 		return err;
2889 
2890 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2891 	s->first_displayed_line = 1;
2892 	s->last_displayed_line = view->nlines;
2893 	s->selected_line = 1;
2894 	s->blame_complete = 0;
2895 	s->path = path;
2896 	if (s->path == NULL)
2897 		return got_error_from_errno("open_blame_view");
2898 	s->repo = repo;
2899 	s->refs = refs;
2900 	s->commit_id = commit_id;
2901 	memset(&s->blame, 0, sizeof(s->blame));
2902 
2903 	view->show = show_blame_view;
2904 	view->input = input_blame_view;
2905 	view->close = close_blame_view;
2906 
2907 	return run_blame(&s->blame, view, &s->blame_complete,
2908 	    &s->first_displayed_line, &s->last_displayed_line,
2909 	    &s->selected_line, &s->done, &s->eof, s->path,
2910 	    s->blamed_commit->id, s->repo);
2911 }
2912 
2913 static const struct got_error *
2914 close_blame_view(struct tog_view *view)
2915 {
2916 	const struct got_error *err = NULL;
2917 	struct tog_blame_view_state *s = &view->state.blame;
2918 
2919 	if (s->blame.thread)
2920 		err = stop_blame(&s->blame);
2921 
2922 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2923 		struct got_object_qid *blamed_commit;
2924 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2925 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2926 		got_object_qid_free(blamed_commit);
2927 	}
2928 
2929 	free(s->path);
2930 
2931 	return err;
2932 }
2933 
2934 static const struct got_error *
2935 show_blame_view(struct tog_view *view)
2936 {
2937 	const struct got_error *err = NULL;
2938 	struct tog_blame_view_state *s = &view->state.blame;
2939 	int errcode;
2940 
2941 	if (s->blame.thread == NULL) {
2942 		errcode = pthread_create(&s->blame.thread, NULL, blame_thread,
2943 		    &s->blame.thread_args);
2944 		if (errcode)
2945 			return got_error_set_errno(errcode, "pthread_create");
2946 	}
2947 
2948 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2949 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2950 	    s->selected_line, &s->first_displayed_line,
2951 	    &s->last_displayed_line, &s->eof, view->nlines);
2952 
2953 	view_vborder(view);
2954 	return err;
2955 }
2956 
2957 static const struct got_error *
2958 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2959     struct tog_view **focus_view, struct tog_view *view, int ch)
2960 {
2961 	const struct got_error *err = NULL, *thread_err = NULL;
2962 	struct tog_view *diff_view;
2963 	struct tog_blame_view_state *s = &view->state.blame;
2964 	int begin_x = 0;
2965 
2966 	switch (ch) {
2967 	case 'q':
2968 		s->done = 1;
2969 		break;
2970 	case 'k':
2971 	case KEY_UP:
2972 		if (s->selected_line > 1)
2973 			s->selected_line--;
2974 		else if (s->selected_line == 1 &&
2975 		    s->first_displayed_line > 1)
2976 			s->first_displayed_line--;
2977 		break;
2978 	case KEY_PPAGE:
2979 		if (s->first_displayed_line == 1) {
2980 			s->selected_line = 1;
2981 			break;
2982 		}
2983 		if (s->first_displayed_line > view->nlines - 2)
2984 			s->first_displayed_line -=
2985 			    (view->nlines - 2);
2986 		else
2987 			s->first_displayed_line = 1;
2988 		break;
2989 	case 'j':
2990 	case KEY_DOWN:
2991 		if (s->selected_line < view->nlines - 2 &&
2992 		    s->first_displayed_line +
2993 		    s->selected_line <= s->blame.nlines)
2994 			s->selected_line++;
2995 		else if (s->last_displayed_line <
2996 		    s->blame.nlines)
2997 			s->first_displayed_line++;
2998 		break;
2999 	case 'b':
3000 	case 'p': {
3001 		struct got_object_id *id = NULL;
3002 		id = get_selected_commit_id(s->blame.lines,
3003 		    s->first_displayed_line, s->selected_line);
3004 		if (id == NULL)
3005 			break;
3006 		if (ch == 'p') {
3007 			struct got_commit_object *commit;
3008 			struct got_object_qid *pid;
3009 			struct got_object_id *blob_id = NULL;
3010 			int obj_type;
3011 			err = got_object_open_as_commit(&commit,
3012 			    s->repo, id);
3013 			if (err)
3014 				break;
3015 			pid = SIMPLEQ_FIRST(
3016 			    got_object_commit_get_parent_ids(commit));
3017 			if (pid == NULL) {
3018 				got_object_commit_close(commit);
3019 				break;
3020 			}
3021 			/* Check if path history ends here. */
3022 			err = got_object_id_by_path(&blob_id, s->repo,
3023 			    pid->id, s->path);
3024 			if (err) {
3025 				if (err->code == GOT_ERR_NO_TREE_ENTRY)
3026 					err = NULL;
3027 				got_object_commit_close(commit);
3028 				break;
3029 			}
3030 			err = got_object_get_type(&obj_type, s->repo,
3031 			    blob_id);
3032 			free(blob_id);
3033 			/* Can't blame non-blob type objects. */
3034 			if (obj_type != GOT_OBJ_TYPE_BLOB) {
3035 				got_object_commit_close(commit);
3036 				break;
3037 			}
3038 			err = got_object_qid_alloc(&s->blamed_commit,
3039 			    pid->id);
3040 			got_object_commit_close(commit);
3041 		} else {
3042 			if (got_object_id_cmp(id,
3043 			    s->blamed_commit->id) == 0)
3044 				break;
3045 			err = got_object_qid_alloc(&s->blamed_commit,
3046 			    id);
3047 		}
3048 		if (err)
3049 			break;
3050 		s->done = 1;
3051 		thread_err = stop_blame(&s->blame);
3052 		s->done = 0;
3053 		if (thread_err)
3054 			break;
3055 		SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
3056 		    s->blamed_commit, entry);
3057 		err = run_blame(&s->blame, view, &s->blame_complete,
3058 		    &s->first_displayed_line, &s->last_displayed_line,
3059 		    &s->selected_line, &s->done, &s->eof,
3060 		    s->path, s->blamed_commit->id, s->repo);
3061 		if (err)
3062 			break;
3063 		break;
3064 	}
3065 	case 'B': {
3066 		struct got_object_qid *first;
3067 		first = SIMPLEQ_FIRST(&s->blamed_commits);
3068 		if (!got_object_id_cmp(first->id, s->commit_id))
3069 			break;
3070 		s->done = 1;
3071 		thread_err = stop_blame(&s->blame);
3072 		s->done = 0;
3073 		if (thread_err)
3074 			break;
3075 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
3076 		got_object_qid_free(s->blamed_commit);
3077 		s->blamed_commit =
3078 		    SIMPLEQ_FIRST(&s->blamed_commits);
3079 		err = run_blame(&s->blame, view, &s->blame_complete,
3080 		    &s->first_displayed_line, &s->last_displayed_line,
3081 		    &s->selected_line, &s->done, &s->eof, s->path,
3082 		    s->blamed_commit->id, s->repo);
3083 		if (err)
3084 			break;
3085 		break;
3086 	}
3087 	case KEY_ENTER:
3088 	case '\r': {
3089 		struct got_object_id *id = NULL;
3090 		struct got_object_qid *pid;
3091 		struct got_commit_object *commit = NULL;
3092 		id = get_selected_commit_id(s->blame.lines,
3093 		    s->first_displayed_line, s->selected_line);
3094 		if (id == NULL)
3095 			break;
3096 		err = got_object_open_as_commit(&commit, s->repo, id);
3097 		if (err)
3098 			break;
3099 		pid = SIMPLEQ_FIRST(
3100 		    got_object_commit_get_parent_ids(commit));
3101 		if (view_is_parent_view(view))
3102 		    begin_x = view_split_begin_x(view->begin_x);
3103 		diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
3104 		if (diff_view == NULL) {
3105 			got_object_commit_close(commit);
3106 			err = got_error_from_errno("view_open");
3107 			break;
3108 		}
3109 		err = open_diff_view(diff_view, pid ? pid->id : NULL,
3110 		    id, NULL, s->refs, s->repo);
3111 		got_object_commit_close(commit);
3112 		if (err) {
3113 			view_close(diff_view);
3114 			break;
3115 		}
3116 		if (view_is_parent_view(view)) {
3117 			err = view_close_child(view);
3118 			if (err)
3119 				break;
3120 			err = view_set_child(view, diff_view);
3121 			if (err) {
3122 				view_close(diff_view);
3123 				break;
3124 			}
3125 			*focus_view = diff_view;
3126 			view->child_focussed = 1;
3127 		} else
3128 			*new_view = diff_view;
3129 		if (err)
3130 			break;
3131 		break;
3132 	}
3133 	case KEY_NPAGE:
3134 	case ' ':
3135 		if (s->last_displayed_line >= s->blame.nlines &&
3136 		    s->selected_line >= MIN(s->blame.nlines,
3137 		    view->nlines - 2)) {
3138 			break;
3139 		}
3140 		if (s->last_displayed_line >= s->blame.nlines &&
3141 		    s->selected_line < view->nlines - 2) {
3142 			s->selected_line = MIN(s->blame.nlines,
3143 			    view->nlines - 2);
3144 			break;
3145 		}
3146 		if (s->last_displayed_line + view->nlines - 2
3147 		    <= s->blame.nlines)
3148 			s->first_displayed_line +=
3149 			    view->nlines - 2;
3150 		else
3151 			s->first_displayed_line =
3152 			    s->blame.nlines -
3153 			    (view->nlines - 3);
3154 		break;
3155 	case KEY_RESIZE:
3156 		if (s->selected_line > view->nlines - 2) {
3157 			s->selected_line = MIN(s->blame.nlines,
3158 			    view->nlines - 2);
3159 		}
3160 		break;
3161 	default:
3162 		break;
3163 	}
3164 	return thread_err ? thread_err : err;
3165 }
3166 
3167 static const struct got_error *
3168 cmd_blame(int argc, char *argv[])
3169 {
3170 	const struct got_error *error;
3171 	struct got_repository *repo = NULL;
3172 	struct got_reflist_head refs;
3173 	struct got_worktree *worktree = NULL;
3174 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
3175 	struct got_object_id *commit_id = NULL;
3176 	char *commit_id_str = NULL;
3177 	int ch;
3178 	struct tog_view *view;
3179 
3180 	SIMPLEQ_INIT(&refs);
3181 
3182 #ifndef PROFILE
3183 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3184 	    NULL) == -1)
3185 		err(1, "pledge");
3186 #endif
3187 
3188 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
3189 		switch (ch) {
3190 		case 'c':
3191 			commit_id_str = optarg;
3192 			break;
3193 		case 'r':
3194 			repo_path = realpath(optarg, NULL);
3195 			if (repo_path == NULL)
3196 				err(1, "-r option");
3197 			break;
3198 		default:
3199 			usage_blame();
3200 			/* NOTREACHED */
3201 		}
3202 	}
3203 
3204 	argc -= optind;
3205 	argv += optind;
3206 
3207 	if (argc == 1)
3208 		path = argv[0];
3209 	else
3210 		usage_blame();
3211 
3212 	cwd = getcwd(NULL, 0);
3213 	if (cwd == NULL) {
3214 		error = got_error_from_errno("getcwd");
3215 		goto done;
3216 	}
3217 	if (repo_path == NULL) {
3218 		error = got_worktree_open(&worktree, cwd);
3219 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3220 			goto done;
3221 		else
3222 			error = NULL;
3223 		if (worktree) {
3224 			repo_path =
3225 			    strdup(got_worktree_get_repo_path(worktree));
3226 			if (repo_path == NULL)
3227 				error = got_error_from_errno("strdup");
3228 			if (error)
3229 				goto done;
3230 		} else {
3231 			repo_path = strdup(cwd);
3232 			if (repo_path == NULL) {
3233 				error = got_error_from_errno("strdup");
3234 				goto done;
3235 			}
3236 		}
3237 	}
3238 
3239 	init_curses();
3240 
3241 	error = got_repo_open(&repo, repo_path);
3242 	if (error != NULL)
3243 		goto done;
3244 
3245 	error = apply_unveil(got_repo_get_path(repo), NULL);
3246 	if (error)
3247 		goto done;
3248 
3249 	if (worktree) {
3250 		const char *prefix = got_worktree_get_path_prefix(worktree);
3251 		char *p, *worktree_subdir = cwd +
3252 		    strlen(got_worktree_get_root_path(worktree));
3253 		if (asprintf(&p, "%s%s%s%s%s",
3254 		    prefix, (strcmp(prefix, "/") != 0) ? "/" : "",
3255 		    worktree_subdir, worktree_subdir[0] ? "/" : "",
3256 		    path) == -1) {
3257 			error = got_error_from_errno("asprintf");
3258 			goto done;
3259 		}
3260 		error = got_repo_map_path(&in_repo_path, repo, p, 0);
3261 		free(p);
3262 	} else {
3263 		error = got_repo_map_path(&in_repo_path, repo, path, 1);
3264 	}
3265 	if (error)
3266 		goto done;
3267 
3268 	if (commit_id_str == NULL) {
3269 		struct got_reference *head_ref;
3270 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD, 0);
3271 		if (error != NULL)
3272 			goto done;
3273 		error = got_ref_resolve(&commit_id, repo, head_ref);
3274 		got_ref_close(head_ref);
3275 	} else {
3276 		error = got_object_resolve_id_str(&commit_id, repo,
3277 		    commit_id_str);
3278 	}
3279 	if (error != NULL)
3280 		goto done;
3281 
3282 	error = got_ref_list(&refs, repo);
3283 	if (error)
3284 		goto done;
3285 
3286 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
3287 	if (view == NULL) {
3288 		error = got_error_from_errno("view_open");
3289 		goto done;
3290 	}
3291 	error = open_blame_view(view, in_repo_path, commit_id, &refs, repo);
3292 	if (error)
3293 		goto done;
3294 	error = view_loop(view);
3295 done:
3296 	free(repo_path);
3297 	free(cwd);
3298 	free(commit_id);
3299 	if (worktree)
3300 		got_worktree_close(worktree);
3301 	if (repo)
3302 		got_repo_close(repo);
3303 	got_ref_list_free(&refs);
3304 	return error;
3305 }
3306 
3307 static const struct got_error *
3308 draw_tree_entries(struct tog_view *view,
3309     struct got_tree_entry **first_displayed_entry,
3310     struct got_tree_entry **last_displayed_entry,
3311     struct got_tree_entry **selected_entry, int *ndisplayed,
3312     const char *label, int show_ids, const char *parent_path,
3313     const struct got_tree_entries *entries, int selected, int limit, int isroot)
3314 {
3315 	const struct got_error *err = NULL;
3316 	struct got_tree_entry *te;
3317 	wchar_t *wline;
3318 	int width, n;
3319 
3320 	*ndisplayed = 0;
3321 
3322 	werase(view->window);
3323 
3324 	if (limit == 0)
3325 		return NULL;
3326 
3327 	err = format_line(&wline, &width, label, view->ncols);
3328 	if (err)
3329 		return err;
3330 	if (view_needs_focus_indication(view))
3331 		wstandout(view->window);
3332 	waddwstr(view->window, wline);
3333 	if (view_needs_focus_indication(view))
3334 		wstandend(view->window);
3335 	free(wline);
3336 	wline = NULL;
3337 	if (width < view->ncols)
3338 		waddch(view->window, '\n');
3339 	if (--limit <= 0)
3340 		return NULL;
3341 	err = format_line(&wline, &width, parent_path, view->ncols);
3342 	if (err)
3343 		return err;
3344 	waddwstr(view->window, wline);
3345 	free(wline);
3346 	wline = NULL;
3347 	if (width < view->ncols)
3348 		waddch(view->window, '\n');
3349 	if (--limit <= 0)
3350 		return NULL;
3351 	waddch(view->window, '\n');
3352 	if (--limit <= 0)
3353 		return NULL;
3354 
3355 	te = SIMPLEQ_FIRST(&entries->head);
3356 	if (*first_displayed_entry == NULL) {
3357 		if (selected == 0) {
3358 			if (view->focussed)
3359 				wstandout(view->window);
3360 			*selected_entry = NULL;
3361 		}
3362 		waddstr(view->window, "  ..\n");	/* parent directory */
3363 		if (selected == 0 && view->focussed)
3364 			wstandend(view->window);
3365 		(*ndisplayed)++;
3366 		if (--limit <= 0)
3367 			return NULL;
3368 		n = 1;
3369 	} else {
3370 		n = 0;
3371 		while (te != *first_displayed_entry)
3372 			te = SIMPLEQ_NEXT(te, entry);
3373 	}
3374 
3375 	while (te) {
3376 		char *line = NULL, *id_str = NULL;
3377 
3378 		if (show_ids) {
3379 			err = got_object_id_str(&id_str, te->id);
3380 			if (err)
3381 				return got_error_from_errno(
3382 				    "got_object_id_str");
3383 		}
3384 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
3385 		    te->name, S_ISDIR(te->mode) ? "/" :
3386 		    ((te->mode & S_IXUSR) ? "*" : "")) == -1) {
3387 			free(id_str);
3388 			return got_error_from_errno("asprintf");
3389 		}
3390 		free(id_str);
3391 		err = format_line(&wline, &width, line, view->ncols);
3392 		if (err) {
3393 			free(line);
3394 			break;
3395 		}
3396 		if (n == selected) {
3397 			if (view->focussed)
3398 				wstandout(view->window);
3399 			*selected_entry = te;
3400 		}
3401 		waddwstr(view->window, wline);
3402 		if (width < view->ncols)
3403 			waddch(view->window, '\n');
3404 		if (n == selected && view->focussed)
3405 			wstandend(view->window);
3406 		free(line);
3407 		free(wline);
3408 		wline = NULL;
3409 		n++;
3410 		(*ndisplayed)++;
3411 		*last_displayed_entry = te;
3412 		if (--limit <= 0)
3413 			break;
3414 		te = SIMPLEQ_NEXT(te, entry);
3415 	}
3416 
3417 	return err;
3418 }
3419 
3420 static void
3421 tree_scroll_up(struct tog_view *view,
3422     struct got_tree_entry **first_displayed_entry, int maxscroll,
3423     const struct got_tree_entries *entries, int isroot)
3424 {
3425 	struct got_tree_entry *te, *prev;
3426 	int i;
3427 
3428 	if (*first_displayed_entry == NULL)
3429 		return;
3430 
3431 	te = SIMPLEQ_FIRST(&entries->head);
3432 	if (*first_displayed_entry == te) {
3433 		if (!isroot)
3434 			*first_displayed_entry = NULL;
3435 		return;
3436 	}
3437 
3438 	/* XXX this is stupid... switch to TAILQ? */
3439 	for (i = 0; i < maxscroll; i++) {
3440 		while (te != *first_displayed_entry) {
3441 			prev = te;
3442 			te = SIMPLEQ_NEXT(te, entry);
3443 		}
3444 		*first_displayed_entry = prev;
3445 		te = SIMPLEQ_FIRST(&entries->head);
3446 	}
3447 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
3448 		*first_displayed_entry = NULL;
3449 }
3450 
3451 static int
3452 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
3453 	struct got_tree_entry *last_displayed_entry,
3454 	const struct got_tree_entries *entries)
3455 {
3456 	struct got_tree_entry *next, *last;
3457 	int n = 0;
3458 
3459 	if (*first_displayed_entry)
3460 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
3461 	else
3462 		next = SIMPLEQ_FIRST(&entries->head);
3463 	last = last_displayed_entry;
3464 	while (next && last && n++ < maxscroll) {
3465 		last = SIMPLEQ_NEXT(last, entry);
3466 		if (last) {
3467 			*first_displayed_entry = next;
3468 			next = SIMPLEQ_NEXT(next, entry);
3469 		}
3470 	}
3471 	return n;
3472 }
3473 
3474 static const struct got_error *
3475 tree_entry_path(char **path, struct tog_parent_trees *parents,
3476     struct got_tree_entry *te)
3477 {
3478 	const struct got_error *err = NULL;
3479 	struct tog_parent_tree *pt;
3480 	size_t len = 2; /* for leading slash and NUL */
3481 
3482 	TAILQ_FOREACH(pt, parents, entry)
3483 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
3484 	if (te)
3485 		len += strlen(te->name);
3486 
3487 	*path = calloc(1, len);
3488 	if (path == NULL)
3489 		return got_error_from_errno("calloc");
3490 
3491 	(*path)[0] = '/';
3492 	pt = TAILQ_LAST(parents, tog_parent_trees);
3493 	while (pt) {
3494 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
3495 			err = got_error(GOT_ERR_NO_SPACE);
3496 			goto done;
3497 		}
3498 		if (strlcat(*path, "/", len) >= len) {
3499 			err = got_error(GOT_ERR_NO_SPACE);
3500 			goto done;
3501 		}
3502 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3503 	}
3504 	if (te) {
3505 		if (strlcat(*path, te->name, len) >= len) {
3506 			err = got_error(GOT_ERR_NO_SPACE);
3507 			goto done;
3508 		}
3509 	}
3510 done:
3511 	if (err) {
3512 		free(*path);
3513 		*path = NULL;
3514 	}
3515 	return err;
3516 }
3517 
3518 static const struct got_error *
3519 blame_tree_entry(struct tog_view **new_view, int begin_x,
3520     struct got_tree_entry *te, struct tog_parent_trees *parents,
3521     struct got_object_id *commit_id, struct got_reflist_head *refs,
3522     struct got_repository *repo)
3523 {
3524 	const struct got_error *err = NULL;
3525 	char *path;
3526 	struct tog_view *blame_view;
3527 
3528 	err = tree_entry_path(&path, parents, te);
3529 	if (err)
3530 		return err;
3531 
3532 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3533 	if (blame_view == NULL)
3534 		return got_error_from_errno("view_open");
3535 
3536 	err = open_blame_view(blame_view, path, commit_id, refs, repo);
3537 	if (err) {
3538 		view_close(blame_view);
3539 		free(path);
3540 	} else
3541 		*new_view = blame_view;
3542 	return err;
3543 }
3544 
3545 static const struct got_error *
3546 log_tree_entry(struct tog_view **new_view, int begin_x,
3547     struct got_tree_entry *te, struct tog_parent_trees *parents,
3548     struct got_object_id *commit_id, struct got_reflist_head *refs,
3549     struct got_repository *repo)
3550 {
3551 	struct tog_view *log_view;
3552 	const struct got_error *err = NULL;
3553 	char *path;
3554 
3555 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3556 	if (log_view == NULL)
3557 		return got_error_from_errno("view_open");
3558 
3559 	err = tree_entry_path(&path, parents, te);
3560 	if (err)
3561 		return err;
3562 
3563 	err = open_log_view(log_view, commit_id, refs, repo, path, 0);
3564 	if (err)
3565 		view_close(log_view);
3566 	else
3567 		*new_view = log_view;
3568 	free(path);
3569 	return err;
3570 }
3571 
3572 static const struct got_error *
3573 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3574     struct got_object_id *commit_id, struct got_reflist_head *refs,
3575     struct got_repository *repo)
3576 {
3577 	const struct got_error *err = NULL;
3578 	char *commit_id_str = NULL;
3579 	struct tog_tree_view_state *s = &view->state.tree;
3580 
3581 	TAILQ_INIT(&s->parents);
3582 
3583 	err = got_object_id_str(&commit_id_str, commit_id);
3584 	if (err != NULL)
3585 		goto done;
3586 
3587 	if (asprintf(&s->tree_label, "commit %s", commit_id_str) == -1) {
3588 		err = got_error_from_errno("asprintf");
3589 		goto done;
3590 	}
3591 
3592 	s->root = s->tree = root;
3593 	s->entries = got_object_tree_get_entries(root);
3594 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3595 	s->commit_id = got_object_id_dup(commit_id);
3596 	if (s->commit_id == NULL) {
3597 		err = got_error_from_errno("got_object_id_dup");
3598 		goto done;
3599 	}
3600 	s->refs = refs;
3601 	s->repo = repo;
3602 
3603 	view->show = show_tree_view;
3604 	view->input = input_tree_view;
3605 	view->close = close_tree_view;
3606 done:
3607 	free(commit_id_str);
3608 	if (err) {
3609 		free(s->tree_label);
3610 		s->tree_label = NULL;
3611 	}
3612 	return err;
3613 }
3614 
3615 static const struct got_error *
3616 close_tree_view(struct tog_view *view)
3617 {
3618 	struct tog_tree_view_state *s = &view->state.tree;
3619 
3620 	free(s->tree_label);
3621 	s->tree_label = NULL;
3622 	free(s->commit_id);
3623 	s->commit_id = NULL;
3624 	while (!TAILQ_EMPTY(&s->parents)) {
3625 		struct tog_parent_tree *parent;
3626 		parent = TAILQ_FIRST(&s->parents);
3627 		TAILQ_REMOVE(&s->parents, parent, entry);
3628 		free(parent);
3629 
3630 	}
3631 	if (s->tree != s->root)
3632 		got_object_tree_close(s->tree);
3633 	got_object_tree_close(s->root);
3634 
3635 	return NULL;
3636 }
3637 
3638 static const struct got_error *
3639 show_tree_view(struct tog_view *view)
3640 {
3641 	const struct got_error *err = NULL;
3642 	struct tog_tree_view_state *s = &view->state.tree;
3643 	char *parent_path;
3644 
3645 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3646 	if (err)
3647 		return err;
3648 
3649 	err = draw_tree_entries(view, &s->first_displayed_entry,
3650 	    &s->last_displayed_entry, &s->selected_entry,
3651 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3652 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3653 	free(parent_path);
3654 
3655 	view_vborder(view);
3656 	return err;
3657 }
3658 
3659 static const struct got_error *
3660 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3661     struct tog_view **focus_view, struct tog_view *view, int ch)
3662 {
3663 	const struct got_error *err = NULL;
3664 	struct tog_tree_view_state *s = &view->state.tree;
3665 	struct tog_view *log_view;
3666 	int begin_x = 0, nscrolled;
3667 
3668 	switch (ch) {
3669 	case 'i':
3670 		s->show_ids = !s->show_ids;
3671 		break;
3672 	case 'l':
3673 		if (!s->selected_entry)
3674 			break;
3675 		if (view_is_parent_view(view))
3676 			begin_x = view_split_begin_x(view->begin_x);
3677 		err = log_tree_entry(&log_view, begin_x,
3678 		    s->selected_entry, &s->parents,
3679 		    s->commit_id, s->refs, s->repo);
3680 		if (view_is_parent_view(view)) {
3681 			err = view_close_child(view);
3682 			if (err)
3683 				return err;
3684 			err = view_set_child(view, log_view);
3685 			if (err) {
3686 				view_close(log_view);
3687 				break;
3688 			}
3689 			*focus_view = log_view;
3690 			view->child_focussed = 1;
3691 		} else
3692 			*new_view = log_view;
3693 		break;
3694 	case 'k':
3695 	case KEY_UP:
3696 		if (s->selected > 0) {
3697 			s->selected--;
3698 			if (s->selected == 0)
3699 				break;
3700 		}
3701 		if (s->selected > 0)
3702 			break;
3703 		tree_scroll_up(view, &s->first_displayed_entry, 1,
3704 		    s->entries, s->tree == s->root);
3705 		break;
3706 	case KEY_PPAGE:
3707 		tree_scroll_up(view, &s->first_displayed_entry,
3708 		    MAX(0, view->nlines - 4 - s->selected), s->entries,
3709 		    s->tree == s->root);
3710 		s->selected = 0;
3711 		if (SIMPLEQ_FIRST(&s->entries->head) ==
3712 		    s->first_displayed_entry && s->tree != s->root)
3713 			s->first_displayed_entry = NULL;
3714 		break;
3715 	case 'j':
3716 	case KEY_DOWN:
3717 		if (s->selected < s->ndisplayed - 1) {
3718 			s->selected++;
3719 			break;
3720 		}
3721 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry) == NULL)
3722 			/* can't scroll any further */
3723 			break;
3724 		tree_scroll_down(&s->first_displayed_entry, 1,
3725 		    s->last_displayed_entry, s->entries);
3726 		break;
3727 	case KEY_NPAGE:
3728 		if (SIMPLEQ_NEXT(s->last_displayed_entry, entry)
3729 		    == NULL) {
3730 			/* can't scroll any further; move cursor down */
3731 			if (s->selected < s->ndisplayed - 1)
3732 				s->selected = s->ndisplayed - 1;
3733 			break;
3734 		}
3735 		nscrolled = tree_scroll_down(&s->first_displayed_entry,
3736 		    view->nlines, s->last_displayed_entry, s->entries);
3737 		if (nscrolled < view->nlines) {
3738 			int ndisplayed = 0;
3739 			struct got_tree_entry *te;
3740 			te = s->first_displayed_entry;
3741 			do {
3742 				ndisplayed++;
3743 				te = SIMPLEQ_NEXT(te, entry);
3744 			} while (te);
3745 			s->selected = ndisplayed - 1;
3746 		}
3747 		break;
3748 	case KEY_ENTER:
3749 	case '\r':
3750 	case KEY_BACKSPACE:
3751 		if (s->selected_entry == NULL || ch == KEY_BACKSPACE) {
3752 			struct tog_parent_tree *parent;
3753 			/* user selected '..' */
3754 			if (s->tree == s->root)
3755 				break;
3756 			parent = TAILQ_FIRST(&s->parents);
3757 			TAILQ_REMOVE(&s->parents, parent,
3758 			    entry);
3759 			got_object_tree_close(s->tree);
3760 			s->tree = parent->tree;
3761 			s->entries =
3762 			    got_object_tree_get_entries(s->tree);
3763 			s->first_displayed_entry =
3764 			    parent->first_displayed_entry;
3765 			s->selected_entry =
3766 			    parent->selected_entry;
3767 			s->selected = parent->selected;
3768 			free(parent);
3769 		} else if (S_ISDIR(s->selected_entry->mode)) {
3770 			struct tog_parent_tree *parent;
3771 			struct got_tree_object *child;
3772 			err = got_object_open_as_tree(&child,
3773 			    s->repo, s->selected_entry->id);
3774 			if (err)
3775 				break;
3776 			parent = calloc(1, sizeof(*parent));
3777 			if (parent == NULL) {
3778 				err = got_error_from_errno("calloc");
3779 				break;
3780 			}
3781 			parent->tree = s->tree;
3782 			parent->first_displayed_entry =
3783 			   s->first_displayed_entry;
3784 			parent->selected_entry = s->selected_entry;
3785 			parent->selected = s->selected;
3786 			TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3787 			s->tree = child;
3788 			s->entries =
3789 			    got_object_tree_get_entries(s->tree);
3790 			s->selected = 0;
3791 			s->first_displayed_entry = NULL;
3792 		} else if (S_ISREG(s->selected_entry->mode)) {
3793 			struct tog_view *blame_view;
3794 			int begin_x = view_is_parent_view(view) ?
3795 			    view_split_begin_x(view->begin_x) : 0;
3796 
3797 			err = blame_tree_entry(&blame_view, begin_x,
3798 			    s->selected_entry, &s->parents,
3799 			    s->commit_id, s->refs, s->repo);
3800 			if (err)
3801 				break;
3802 			if (view_is_parent_view(view)) {
3803 				err = view_close_child(view);
3804 				if (err)
3805 					return err;
3806 				err = view_set_child(view, blame_view);
3807 				if (err) {
3808 					view_close(blame_view);
3809 					break;
3810 				}
3811 				*focus_view = blame_view;
3812 				view->child_focussed = 1;
3813 			} else
3814 				*new_view = blame_view;
3815 		}
3816 		break;
3817 	case KEY_RESIZE:
3818 		if (s->selected > view->nlines)
3819 			s->selected = s->ndisplayed - 1;
3820 		break;
3821 	default:
3822 		break;
3823 	}
3824 
3825 	return err;
3826 }
3827 
3828 __dead static void
3829 usage_tree(void)
3830 {
3831 	endwin();
3832 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3833 	    getprogname());
3834 	exit(1);
3835 }
3836 
3837 static const struct got_error *
3838 cmd_tree(int argc, char *argv[])
3839 {
3840 	const struct got_error *error;
3841 	struct got_repository *repo = NULL;
3842 	struct got_reflist_head refs;
3843 	char *repo_path = NULL;
3844 	struct got_object_id *commit_id = NULL;
3845 	char *commit_id_arg = NULL;
3846 	struct got_commit_object *commit = NULL;
3847 	struct got_tree_object *tree = NULL;
3848 	int ch;
3849 	struct tog_view *view;
3850 
3851 	SIMPLEQ_INIT(&refs);
3852 
3853 #ifndef PROFILE
3854 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd unveil",
3855 	    NULL) == -1)
3856 		err(1, "pledge");
3857 #endif
3858 
3859 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3860 		switch (ch) {
3861 		case 'c':
3862 			commit_id_arg = optarg;
3863 			break;
3864 		default:
3865 			usage_tree();
3866 			/* NOTREACHED */
3867 		}
3868 	}
3869 
3870 	argc -= optind;
3871 	argv += optind;
3872 
3873 	if (argc == 0) {
3874 		struct got_worktree *worktree;
3875 		char *cwd = getcwd(NULL, 0);
3876 		if (cwd == NULL)
3877 			return got_error_from_errno("getcwd");
3878 		error = got_worktree_open(&worktree, cwd);
3879 		if (error && error->code != GOT_ERR_NOT_WORKTREE)
3880 			goto done;
3881 		if (worktree) {
3882 			free(cwd);
3883 			repo_path =
3884 			    strdup(got_worktree_get_repo_path(worktree));
3885 			got_worktree_close(worktree);
3886 		} else
3887 			repo_path = cwd;
3888 		if (repo_path == NULL) {
3889 			error = got_error_from_errno("strdup");
3890 			goto done;
3891 		}
3892 	} else if (argc == 1) {
3893 		repo_path = realpath(argv[0], NULL);
3894 		if (repo_path == NULL)
3895 			return got_error_from_errno2("realpath", argv[0]);
3896 	} else
3897 		usage_log();
3898 
3899 	init_curses();
3900 
3901 	error = got_repo_open(&repo, repo_path);
3902 	if (error != NULL)
3903 		goto done;
3904 
3905 	error = apply_unveil(got_repo_get_path(repo), NULL);
3906 	if (error)
3907 		goto done;
3908 
3909 	if (commit_id_arg == NULL)
3910 		error = get_head_commit_id(&commit_id, repo);
3911 	else
3912 		error = got_object_resolve_id_str(&commit_id, repo,
3913 		    commit_id_arg);
3914 	if (error != NULL)
3915 		goto done;
3916 
3917 	error = got_object_open_as_commit(&commit, repo, commit_id);
3918 	if (error != NULL)
3919 		goto done;
3920 
3921 	error = got_object_open_as_tree(&tree, repo,
3922 	    got_object_commit_get_tree_id(commit));
3923 	if (error != NULL)
3924 		goto done;
3925 
3926 	error = got_ref_list(&refs, repo);
3927 	if (error)
3928 		goto done;
3929 
3930 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3931 	if (view == NULL) {
3932 		error = got_error_from_errno("view_open");
3933 		goto done;
3934 	}
3935 	error = open_tree_view(view, tree, commit_id, &refs, repo);
3936 	if (error)
3937 		goto done;
3938 	error = view_loop(view);
3939 done:
3940 	free(repo_path);
3941 	free(commit_id);
3942 	if (commit)
3943 		got_object_commit_close(commit);
3944 	if (tree)
3945 		got_object_tree_close(tree);
3946 	if (repo)
3947 		got_repo_close(repo);
3948 	got_ref_list_free(&refs);
3949 	return error;
3950 }
3951 
3952 __dead static void
3953 usage(void)
3954 {
3955 	int i;
3956 
3957 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3958 	    "Available commands:\n", getprogname());
3959 	for (i = 0; i < nitems(tog_commands); i++) {
3960 		struct tog_cmd *cmd = &tog_commands[i];
3961 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3962 	}
3963 	exit(1);
3964 }
3965 
3966 static char **
3967 make_argv(const char *arg0, const char *arg1)
3968 {
3969 	char **argv;
3970 	int argc = (arg1 == NULL ? 1 : 2);
3971 
3972 	argv = calloc(argc, sizeof(char *));
3973 	if (argv == NULL)
3974 		err(1, "calloc");
3975 	argv[0] = strdup(arg0);
3976 	if (argv[0] == NULL)
3977 		err(1, "calloc");
3978 	if (arg1) {
3979 		argv[1] = strdup(arg1);
3980 		if (argv[1] == NULL)
3981 			err(1, "calloc");
3982 	}
3983 
3984 	return argv;
3985 }
3986 
3987 int
3988 main(int argc, char *argv[])
3989 {
3990 	const struct got_error *error = NULL;
3991 	struct tog_cmd *cmd = NULL;
3992 	int ch, hflag = 0;
3993 	char **cmd_argv = NULL;
3994 
3995 	setlocale(LC_CTYPE, "");
3996 
3997 	while ((ch = getopt(argc, argv, "h")) != -1) {
3998 		switch (ch) {
3999 		case 'h':
4000 			hflag = 1;
4001 			break;
4002 		default:
4003 			usage();
4004 			/* NOTREACHED */
4005 		}
4006 	}
4007 
4008 	argc -= optind;
4009 	argv += optind;
4010 	optind = 0;
4011 	optreset = 1;
4012 
4013 	if (argc == 0) {
4014 		if (hflag)
4015 			usage();
4016 		/* Build an argument vector which runs a default command. */
4017 		cmd = &tog_commands[0];
4018 		cmd_argv = make_argv(cmd->name, NULL);
4019 		argc = 1;
4020 	} else {
4021 		int i;
4022 
4023 		/* Did the user specific a command? */
4024 		for (i = 0; i < nitems(tog_commands); i++) {
4025 			if (strncmp(tog_commands[i].name, argv[0],
4026 			    strlen(argv[0])) == 0) {
4027 				cmd = &tog_commands[i];
4028 				if (hflag)
4029 					tog_commands[i].cmd_usage();
4030 				break;
4031 			}
4032 		}
4033 		if (cmd == NULL) {
4034 			/* Did the user specify a repository? */
4035 			char *repo_path = realpath(argv[0], NULL);
4036 			if (repo_path) {
4037 				struct got_repository *repo;
4038 				error = got_repo_open(&repo, repo_path);
4039 				if (error == NULL)
4040 					got_repo_close(repo);
4041 			} else
4042 				error = got_error_from_errno2("realpath",
4043 				    argv[0]);
4044 			if (error) {
4045 				if (hflag) {
4046 					fprintf(stderr, "%s: '%s' is not a "
4047 					    "known command\n", getprogname(),
4048 					    argv[0]);
4049 					usage();
4050 				}
4051 				fprintf(stderr, "%s: '%s' is neither a known "
4052 				    "command nor a path to a repository\n",
4053 				    getprogname(), argv[0]);
4054 				free(repo_path);
4055 				return 1;
4056 			}
4057 			cmd = &tog_commands[0];
4058 			cmd_argv = make_argv(cmd->name, repo_path);
4059 			argc = 2;
4060 			free(repo_path);
4061 		}
4062 	}
4063 
4064 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
4065 	if (error)
4066 		goto done;
4067 done:
4068 	endwin();
4069 	free(cmd_argv);
4070 	if (error)
4071 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
4072 	return 0;
4073 }