1 /*
2  * Copyright (c) 2018 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 
20 #include <errno.h>
21 #define _XOPEN_SOURCE_EXTENDED
22 #include <curses.h>
23 #undef _XOPEN_SOURCE_EXTENDED
24 #include <panel.h>
25 #include <locale.h>
26 #include <stdlib.h>
27 #include <stdio.h>
28 #include <getopt.h>
29 #include <string.h>
30 #include <err.h>
31 #include <unistd.h>
32 #include <util.h>
33 #include <limits.h>
34 #include <wchar.h>
35 #include <time.h>
36 #include <pthread.h>
37 #include <libgen.h>
38 
39 #include "got_error.h"
40 #include "got_object.h"
41 #include "got_reference.h"
42 #include "got_repository.h"
43 #include "got_diff.h"
44 #include "got_opentemp.h"
45 #include "got_commit_graph.h"
46 #include "got_utf8.h"
47 #include "got_blame.h"
48 
49 #ifndef MIN
50 #define	MIN(_a,_b) ((_a) < (_b) ? (_a) : (_b))
51 #endif
52 
53 #ifndef nitems
54 #define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
55 #endif
56 
57 struct tog_cmd {
58 	const char *name;
59 	const struct got_error *(*cmd_main)(int, char *[]);
60 	void (*cmd_usage)(void);
61 	const char *descr;
62 };
63 
64 __dead static void	usage(void);
65 __dead static void	usage_log(void);
66 __dead static void	usage_diff(void);
67 __dead static void	usage_blame(void);
68 __dead static void	usage_tree(void);
69 
70 static const struct got_error*	cmd_log(int, char *[]);
71 static const struct got_error*	cmd_diff(int, char *[]);
72 static const struct got_error*	cmd_blame(int, char *[]);
73 static const struct got_error*	cmd_tree(int, char *[]);
74 
75 static struct tog_cmd tog_commands[] = {
76 	{ "log",	cmd_log,	usage_log,
77 	    "show repository history" },
78 	{ "diff",	cmd_diff,	usage_diff,
79 	    "compare files and directories" },
80 	{ "blame",	cmd_blame,	usage_blame,
81 	    "show line-by-line file history" },
82 	{ "tree",	cmd_tree,	usage_tree,
83 	    "browse trees in repository" },
84 };
85 
86 enum tog_view_type {
87 	TOG_VIEW_DIFF,
88 	TOG_VIEW_LOG,
89 	TOG_VIEW_BLAME,
90 	TOG_VIEW_TREE
91 };
92 
93 struct tog_diff_view_state {
94 	struct got_object_id *id1, *id2;
95 	FILE *f;
96 	int first_displayed_line;
97 	int last_displayed_line;
98 	int eof;
99 	int diff_context;
100 	struct got_repository *repo;
101 };
102 
103 struct commit_queue_entry {
104 	TAILQ_ENTRY(commit_queue_entry) entry;
105 	struct got_object_id *id;
106 	struct got_commit_object *commit;
107 	int idx;
108 };
109 TAILQ_HEAD(commit_queue_head, commit_queue_entry);
110 struct commit_queue {
111 	int ncommits;
112 	struct commit_queue_head head;
113 };
114 
115 pthread_mutex_t tog_mutex = PTHREAD_MUTEX_INITIALIZER;
116 
117 struct tog_log_thread_args {
118 	pthread_cond_t need_commits;
119 	int commits_needed;
120 	struct got_commit_graph *graph;
121 	struct commit_queue *commits;
122 	const char *in_repo_path;
123 	struct got_object_id *start_id;
124 	struct got_repository *repo;
125 	int log_complete;
126 	sig_atomic_t *quit;
127 	struct tog_view *view;
128 	struct commit_queue_entry **first_displayed_entry;
129 	struct commit_queue_entry **last_displayed_entry;
130 	struct commit_queue_entry **selected_entry;
131 	int *selected;
132 };
133 
134 struct tog_log_view_state {
135 	struct commit_queue commits;
136 	struct commit_queue_entry *first_displayed_entry;
137 	struct commit_queue_entry *last_displayed_entry;
138 	struct commit_queue_entry *selected_entry;
139 	int selected;
140 	char *in_repo_path;
141 	struct got_repository *repo;
142 	struct got_object_id *start_id;
143 	sig_atomic_t quit;
144 	pthread_t thread;
145 	struct tog_log_thread_args thread_args;
146 };
147 
148 struct tog_blame_cb_args {
149 	struct tog_blame_line *lines; /* one per line */
150 	int nlines;
151 
152 	struct tog_view *view;
153 	struct got_object_id *commit_id;
154 	FILE *f;
155 	const char *path;
156 	int *first_displayed_line;
157 	int *last_displayed_line;
158 	int *selected_line;
159 	int *quit;
160 	int *eof;
161 };
162 
163 struct tog_blame_thread_args {
164 	const char *path;
165 	struct got_repository *repo;
166 	struct tog_blame_cb_args *cb_args;
167 	int *complete;
168 };
169 
170 struct tog_blame {
171 	FILE *f;
172 	size_t filesize;
173 	struct tog_blame_line *lines;
174 	size_t nlines;
175 	pthread_t thread;
176 	struct tog_blame_thread_args thread_args;
177 	struct tog_blame_cb_args cb_args;
178 	const char *path;
179 };
180 
181 struct tog_blame_view_state {
182 	int first_displayed_line;
183 	int last_displayed_line;
184 	int selected_line;
185 	int blame_complete;
186 	int eof;
187 	int done;
188 	struct got_object_id_queue blamed_commits;
189 	struct got_object_qid *blamed_commit;
190 	char *path;
191 	struct got_repository *repo;
192 	struct got_object_id *commit_id;
193 	struct tog_blame blame;
194 };
195 
196 struct tog_parent_tree {
197 	TAILQ_ENTRY(tog_parent_tree) entry;
198 	struct got_tree_object *tree;
199 	struct got_tree_entry *first_displayed_entry;
200 	struct got_tree_entry *selected_entry;
201 	int selected;
202 };
203 
204 TAILQ_HEAD(tog_parent_trees, tog_parent_tree);
205 
206 struct tog_tree_view_state {
207 	char *tree_label;
208 	struct got_tree_object *root;
209 	struct got_tree_object *tree;
210 	const struct got_tree_entries *entries;
211 	struct got_tree_entry *first_displayed_entry;
212 	struct got_tree_entry *last_displayed_entry;
213 	struct got_tree_entry *selected_entry;
214 	int nentries, ndisplayed, selected, show_ids;
215 	struct tog_parent_trees parents;
216 	struct got_object_id *commit_id;
217 	struct got_repository *repo;
218 };
219 
220 /*
221  * We implement two types of views: parent views and child views.
222  *
223  * The 'Tab' key switches between a parent view and its child view.
224  * Child views are shown side-by-side to their parent view, provided
225  * there is enough screen estate.
226  *
227  * When a new view is opened from within a parent view, this new view
228  * becomes a child view of the parent view, replacing any existing child.
229  *
230  * When a new view is opened from within a child view, this new view
231  * becomes a parent view which will obscure the views below until the
232  * user quits the new parent view by typing 'q'.
233  *
234  * This list of views contains parent views only.
235  * Child views are only pointed to by their parent view.
236  */
237 TAILQ_HEAD(tog_view_list_head, tog_view);
238 
239 struct tog_view {
240 	TAILQ_ENTRY(tog_view) entry;
241 	WINDOW *window;
242 	PANEL *panel;
243 	int nlines, ncols, begin_y, begin_x;
244 	int lines, cols; /* copies of LINES and COLS */
245 	int focussed;
246 	struct tog_view *parent;
247 	struct tog_view *child;
248 	int child_focussed;
249 
250 	/* type-specific state */
251 	enum tog_view_type type;
252 	union {
253 		struct tog_diff_view_state diff;
254 		struct tog_log_view_state log;
255 		struct tog_blame_view_state blame;
256 		struct tog_tree_view_state tree;
257 	} state;
258 
259 	const struct got_error *(*show)(struct tog_view *);
260 	const struct got_error *(*input)(struct tog_view **,
261 	    struct tog_view **, struct tog_view**, struct tog_view *, int);
262 	const struct got_error *(*close)(struct tog_view *);
263 };
264 
265 static const struct got_error *open_diff_view(struct tog_view *,
266     struct got_object *, struct got_object *, struct got_repository *);
267 static const struct got_error *show_diff_view(struct tog_view *);
268 static const struct got_error *input_diff_view(struct tog_view **,
269     struct tog_view **, struct tog_view **, struct tog_view *, int);
270 static const struct got_error* close_diff_view(struct tog_view *);
271 
272 static const struct got_error *open_log_view(struct tog_view *,
273     struct got_object_id *, struct got_repository *, const char *);
274 static const struct got_error * show_log_view(struct tog_view *);
275 static const struct got_error *input_log_view(struct tog_view **,
276     struct tog_view **, struct tog_view **, struct tog_view *, int);
277 static const struct got_error *close_log_view(struct tog_view *);
278 
279 static const struct got_error *open_blame_view(struct tog_view *, char *,
280     struct got_object_id *, struct got_repository *);
281 static const struct got_error *show_blame_view(struct tog_view *);
282 static const struct got_error *input_blame_view(struct tog_view **,
283     struct tog_view **, struct tog_view **, struct tog_view *, int);
284 static const struct got_error *close_blame_view(struct tog_view *);
285 
286 static const struct got_error *open_tree_view(struct tog_view *,
287     struct got_tree_object *, struct got_object_id *, struct got_repository *);
288 static const struct got_error *show_tree_view(struct tog_view *);
289 static const struct got_error *input_tree_view(struct tog_view **,
290     struct tog_view **, struct tog_view **, struct tog_view *, int);
291 static const struct got_error *close_tree_view(struct tog_view *);
292 
293 static const struct got_error *
294 view_close(struct tog_view *view)
295 {
296 	const struct got_error *err = NULL;
297 
298 	if (view->child) {
299 		view_close(view->child);
300 		view->child = NULL;
301 	}
302 	if (view->close)
303 		err = view->close(view);
304 	if (view->panel)
305 		del_panel(view->panel);
306 	if (view->window)
307 		delwin(view->window);
308 	free(view);
309 	return err;
310 }
311 
312 static struct tog_view *
313 view_open(int nlines, int ncols, int begin_y, int begin_x,
314     enum tog_view_type type)
315 {
316 	struct tog_view *view = calloc(1, sizeof(*view));
317 
318 	if (view == NULL)
319 		return NULL;
320 
321 	view->type = type;
322 	view->lines = LINES;
323 	view->cols = COLS;
324 	view->nlines = nlines ? nlines : LINES - begin_y;
325 	view->ncols = ncols ? ncols : COLS - begin_x;
326 	view->begin_y = begin_y;
327 	view->begin_x = begin_x;
328 	view->window = newwin(nlines, ncols, begin_y, begin_x);
329 	if (view->window == NULL) {
330 		view_close(view);
331 		return NULL;
332 	}
333 	view->panel = new_panel(view->window);
334 	if (view->panel == NULL ||
335 	    set_panel_userptr(view->panel, view) != OK) {
336 		view_close(view);
337 		return NULL;
338 	}
339 
340 	keypad(view->window, TRUE);
341 	return view;
342 }
343 
344 static int
345 view_split_begin_x(int begin_x)
346 {
347 	if (begin_x > 0)
348 		return 0;
349 	return (COLS >= 120 ? COLS/2 : 0);
350 }
351 
352 static const struct got_error *view_resize(struct tog_view *);
353 
354 static const struct got_error *
355 view_splitscreen(struct tog_view *view)
356 {
357 	const struct got_error *err = NULL;
358 
359 	view->begin_y = 0;
360 	view->begin_x = view_split_begin_x(0);
361 	view->nlines = LINES;
362 	view->ncols = COLS - view->begin_x;
363 	view->lines = LINES;
364 	view->cols = COLS;
365 	err = view_resize(view);
366 	if (err)
367 		return err;
368 
369 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
370 		return got_error_from_errno();
371 
372 	return NULL;
373 }
374 
375 static const struct got_error *
376 view_fullscreen(struct tog_view *view)
377 {
378 	const struct got_error *err = NULL;
379 
380 	view->begin_x = 0;
381 	view->begin_y = 0;
382 	view->nlines = LINES;
383 	view->ncols = COLS;
384 	view->lines = LINES;
385 	view->cols = COLS;
386 	err = view_resize(view);
387 	if (err)
388 		return err;
389 
390 	if (mvwin(view->window, view->begin_y, view->begin_x) == ERR)
391 		return got_error_from_errno();
392 
393 	return NULL;
394 }
395 
396 static int
397 view_is_parent_view(struct tog_view *view)
398 {
399 	return view->parent == NULL;
400 }
401 
402 static const struct got_error *
403 view_resize(struct tog_view *view)
404 {
405 	int nlines, ncols;
406 
407 	if (view->lines > LINES)
408 		nlines = view->nlines - (view->lines - LINES);
409 	else
410 		nlines = view->nlines + (LINES - view->lines);
411 
412 	if (view->cols > COLS)
413 		ncols = view->ncols - (view->cols - COLS);
414 	else
415 		ncols = view->ncols + (COLS - view->cols);
416 
417 	if (wresize(view->window, nlines, ncols) == ERR)
418 		return got_error_from_errno();
419 	replace_panel(view->panel, view->window);
420 
421 	view->nlines = nlines;
422 	view->ncols = ncols;
423 	view->lines = LINES;
424 	view->cols = COLS;
425 
426 	if (view->child) {
427 		view->child->begin_x = view_split_begin_x(view->begin_x);
428 		if (view->child->begin_x == 0) {
429 			view_fullscreen(view->child);
430 			if (view->child->focussed)
431 				show_panel(view->child->panel);
432 			else
433 				show_panel(view->panel);
434 		} else {
435 			view_splitscreen(view->child);
436 			show_panel(view->child->panel);
437 		}
438 	}
439 
440 	return NULL;
441 }
442 
443 static const struct got_error *
444 view_close_child(struct tog_view *view)
445 {
446 	const struct got_error *err = NULL;
447 
448 	if (view->child == NULL)
449 		return NULL;
450 
451 	err = view_close(view->child);
452 	view->child = NULL;
453 	return err;
454 }
455 
456 static const struct got_error *
457 view_set_child(struct tog_view *view, struct tog_view *child)
458 {
459 	const struct got_error *err = NULL;
460 
461 	view->child = child;
462 	child->parent = view;
463 	return err;
464 }
465 
466 static int
467 view_is_splitscreen(struct tog_view *view)
468 {
469 	return !view_is_parent_view(view) && view->begin_x > 0;
470 }
471 
472 static const struct got_error *
473 view_input(struct tog_view **new, struct tog_view **dead,
474     struct tog_view **focus, int *done, struct tog_view *view,
475     struct tog_view_list_head *views)
476 {
477 	const struct got_error *err = NULL;
478 	struct tog_view *v;
479 	int ch, errcode;
480 
481 	*new = NULL;
482 	*dead = NULL;
483 	*focus = NULL;
484 
485 	nodelay(stdscr, FALSE);
486 	/* Allow threads to make progress while we are waiting for input. */
487 	errcode = pthread_mutex_unlock(&tog_mutex);
488 	if (errcode)
489 		return got_error_set_errno(errcode);
490 	ch = wgetch(view->window);
491 	errcode = pthread_mutex_lock(&tog_mutex);
492 	if (errcode)
493 		return got_error_set_errno(errcode);
494 	nodelay(stdscr, TRUE);
495 	switch (ch) {
496 		case ERR:
497 			break;
498 		case '\t':
499 			if (view->child) {
500 				*focus = view->child;
501 				view->child_focussed = 1;
502 			} else if (view->parent) {
503 				*focus = view->parent;
504 				view->parent->child_focussed = 0;
505 			}
506 			break;
507 		case 'q':
508 			err = view->input(new, dead, focus, view, ch);
509 			*dead = view;
510 			break;
511 		case 'Q':
512 			*done = 1;
513 			break;
514 		case 'f':
515 			if (view_is_parent_view(view)) {
516 				if (view->child == NULL)
517 					break;
518 				if (view_is_splitscreen(view->child)) {
519 					*focus = view->child;
520 					view->child_focussed = 1;
521 					err = view_fullscreen(view->child);
522 				} else
523 					err = view_splitscreen(view->child);
524 				if (err)
525 					break;
526 				err = view->child->input(new, dead, focus,
527 				    view->child, KEY_RESIZE);
528 			} else {
529 				if (view_is_splitscreen(view)) {
530 					*focus = view;
531 					view->parent->child_focussed = 1;
532 					err = view_fullscreen(view);
533 				} else {
534 					err = view_splitscreen(view);
535 				}
536 				if (err)
537 					break;
538 				err = view->input(new, dead, focus, view,
539 				    KEY_RESIZE);
540 			}
541 			break;
542 		case KEY_RESIZE:
543 			TAILQ_FOREACH(v, views, entry) {
544 				err = view_resize(v);
545 				if (err)
546 					return err;
547 				err = v->input(new, dead, focus, v, ch);
548 				if (err)
549 					return err;
550 			}
551 			break;
552 		default:
553 			err = view->input(new, dead, focus, view, ch);
554 			break;
555 	}
556 
557 	return err;
558 }
559 
560 void
561 view_vborder(struct tog_view *view)
562 {
563 	PANEL *panel;
564 	struct tog_view *view_above;
565 
566 	if (view->parent)
567 		return view_vborder(view->parent);
568 
569 	panel = panel_above(view->panel);
570 	if (panel == NULL)
571 		return;
572 
573 	view_above = panel_userptr(panel);
574 	mvwvline(view->window, view->begin_y, view_above->begin_x - 1,
575 	    got_locale_is_utf8() ? ACS_VLINE : '|', view->nlines);
576 }
577 
578 int
579 view_needs_focus_indication(struct tog_view *view)
580 {
581 	if (view_is_parent_view(view)) {
582 		if (view->child == NULL || view->child_focussed)
583 			return 0;
584 		if (!view_is_splitscreen(view->child))
585 			return 0;
586 	} else if (!view_is_splitscreen(view))
587 		return 0;
588 
589 	return view->focussed;
590 }
591 
592 static const struct got_error *
593 view_loop(struct tog_view *view)
594 {
595 	const struct got_error *err = NULL;
596 	struct tog_view_list_head views;
597 	struct tog_view *new_view, *dead_view, *focus_view, *main_view;
598 	int done = 0, errcode;
599 
600 	errcode = pthread_mutex_lock(&tog_mutex);
601 	if (errcode)
602 		return got_error_set_errno(errcode);
603 
604 	TAILQ_INIT(&views);
605 	TAILQ_INSERT_HEAD(&views, view, entry);
606 
607 	main_view = view;
608 	view->focussed = 1;
609 	err = view->show(view);
610 	if (err)
611 		return err;
612 	update_panels();
613 	doupdate();
614 	while (!TAILQ_EMPTY(&views) && !done) {
615 		err = view_input(&new_view, &dead_view, &focus_view, &done,
616 		    view, &views);
617 		if (err)
618 			break;
619 		if (dead_view) {
620 			struct tog_view *prev = NULL;
621 
622 			if (view_is_parent_view(dead_view))
623 				prev = TAILQ_PREV(dead_view,
624 				    tog_view_list_head, entry);
625 			else
626 				prev = view->parent;
627 
628 			if (dead_view->parent)
629 				dead_view->parent->child = NULL;
630 			else
631 				TAILQ_REMOVE(&views, dead_view, entry);
632 
633 			err = view_close(dead_view);
634 			if (err || dead_view == main_view)
635 				goto done;
636 
637 			if (view == dead_view) {
638 				if (focus_view)
639 					view = focus_view;
640 				else if (prev)
641 					view = prev;
642 				else if (!TAILQ_EMPTY(&views))
643 					view = TAILQ_LAST(&views,
644 					    tog_view_list_head);
645 				else
646 					view = NULL;
647 				if (view) {
648 					if (view->child && view->child_focussed)
649 						focus_view = view->child;
650 					else
651 						focus_view = view;
652 				}
653 			}
654 		}
655 		if (new_view) {
656 			struct tog_view *v, *t;
657 			/* Only allow one parent view per type. */
658 			TAILQ_FOREACH_SAFE(v, &views, entry, t) {
659 				if (v->type != new_view->type)
660 					continue;
661 				TAILQ_REMOVE(&views, v, entry);
662 				err = view_close(v);
663 				if (err)
664 					goto done;
665 				if (v == view)
666 					view = new_view;
667 				break;
668 			}
669 			TAILQ_INSERT_TAIL(&views, new_view, entry);
670 			if (focus_view == NULL)
671 				focus_view = new_view;
672 		}
673 		if (focus_view) {
674 			show_panel(focus_view->panel);
675 			if (view)
676 				view->focussed = 0;
677 			focus_view->focussed = 1;
678 			view = focus_view;
679 			if (new_view)
680 				show_panel(new_view->panel);
681 			if (view->child && view_is_splitscreen(view->child))
682 				show_panel(view->child->panel);
683 		}
684 		if (view) {
685 			if (focus_view == NULL) {
686 				focus_view = view;
687 				focus_view->focussed = 1;
688 			}
689 			if (view->parent) {
690 				err = view->parent->show(view->parent);
691 				if (err)
692 					goto done;
693 			}
694 			err = view->show(view);
695 			if (err)
696 				goto done;
697 			if (view->child) {
698 				err = view->child->show(view->child);
699 				if (err)
700 					goto done;
701 			}
702 			update_panels();
703 			doupdate();
704 		}
705 	}
706 done:
707 	while (!TAILQ_EMPTY(&views)) {
708 		view = TAILQ_FIRST(&views);
709 		TAILQ_REMOVE(&views, view, entry);
710 		view_close(view);
711 	}
712 
713 	errcode = pthread_mutex_unlock(&tog_mutex);
714 	if (errcode)
715 		return got_error_set_errno(errcode);
716 
717 	return err;
718 }
719 
720 __dead static void
721 usage_log(void)
722 {
723 	endwin();
724 	fprintf(stderr,
725 	    "usage: %s log [-c commit] [-r repository-path] [path]\n",
726 	    getprogname());
727 	exit(1);
728 }
729 
730 /* Create newly allocated wide-character string equivalent to a byte string. */
731 static const struct got_error *
732 mbs2ws(wchar_t **ws, size_t *wlen, const char *s)
733 {
734 	char *vis = NULL;
735 	const struct got_error *err = NULL;
736 
737 	*ws = NULL;
738 	*wlen = mbstowcs(NULL, s, 0);
739 	if (*wlen == (size_t)-1) {
740 		int vislen;
741 		if (errno != EILSEQ)
742 			return got_error_from_errno();
743 
744 		/* byte string invalid in current encoding; try to "fix" it */
745 		err = got_mbsavis(&vis, &vislen, s);
746 		if (err)
747 			return err;
748 		*wlen = mbstowcs(NULL, vis, 0);
749 		if (*wlen == (size_t)-1) {
750 			err = got_error_from_errno(); /* give up */
751 			goto done;
752 		}
753 	}
754 
755 	*ws = calloc(*wlen + 1, sizeof(*ws));
756 	if (*ws == NULL) {
757 		err = got_error_from_errno();
758 		goto done;
759 	}
760 
761 	if (mbstowcs(*ws, vis ? vis : s, *wlen) != *wlen)
762 		err = got_error_from_errno();
763 done:
764 	free(vis);
765 	if (err) {
766 		free(*ws);
767 		*ws = NULL;
768 		*wlen = 0;
769 	}
770 	return err;
771 }
772 
773 /* Format a line for display, ensuring that it won't overflow a width limit. */
774 static const struct got_error *
775 format_line(wchar_t **wlinep, int *widthp, const char *line, int wlimit)
776 {
777 	const struct got_error *err = NULL;
778 	int cols = 0;
779 	wchar_t *wline = NULL;
780 	size_t wlen;
781 	int i;
782 
783 	*wlinep = NULL;
784 	*widthp = 0;
785 
786 	err = mbs2ws(&wline, &wlen, line);
787 	if (err)
788 		return err;
789 
790 	i = 0;
791 	while (i < wlen && cols < wlimit) {
792 		int width = wcwidth(wline[i]);
793 		switch (width) {
794 		case 0:
795 			i++;
796 			break;
797 		case 1:
798 		case 2:
799 			if (cols + width <= wlimit)
800 				cols += width;
801 			i++;
802 			break;
803 		case -1:
804 			if (wline[i] == L'\t')
805 				cols += TABSIZE - ((cols + 1) % TABSIZE);
806 			i++;
807 			break;
808 		default:
809 			err = got_error_from_errno();
810 			goto done;
811 		}
812 	}
813 	wline[i] = L'\0';
814 	if (widthp)
815 		*widthp = cols;
816 done:
817 	if (err)
818 		free(wline);
819 	else
820 		*wlinep = wline;
821 	return err;
822 }
823 
824 static const struct got_error *
825 draw_commit(struct tog_view *view, struct got_commit_object *commit,
826     struct got_object_id *id)
827 {
828 	const struct got_error *err = NULL;
829 	char datebuf[10]; /* YY-MM-DD + SPACE + NUL */
830 	char *logmsg0 = NULL, *logmsg = NULL;
831 	char *author0 = NULL, *author = NULL;
832 	wchar_t *wlogmsg = NULL, *wauthor = NULL;
833 	int author_width, logmsg_width;
834 	char *newline, *smallerthan;
835 	char *line = NULL;
836 	int col, limit;
837 	static const size_t date_display_cols = 9;
838 	static const size_t author_display_cols = 16;
839 	const int avail = view->ncols;
840 
841 	if (strftime(datebuf, sizeof(datebuf), "%g/%m/%d ",
842 	    &commit->tm_committer) >= sizeof(datebuf))
843 		return got_error(GOT_ERR_NO_SPACE);
844 
845 	if (avail < date_display_cols)
846 		limit = MIN(sizeof(datebuf) - 1, avail);
847 	else
848 		limit = MIN(date_display_cols, sizeof(datebuf) - 1);
849 	waddnstr(view->window, datebuf, limit);
850 	col = limit + 1;
851 	if (col > avail)
852 		goto done;
853 
854 	author0 = strdup(commit->author);
855 	if (author0 == NULL) {
856 		err = got_error_from_errno();
857 		goto done;
858 	}
859 	author = author0;
860 	smallerthan = strchr(author, '<');
861 	if (smallerthan)
862 		*smallerthan = '\0';
863 	else {
864 		char *at = strchr(author, '@');
865 		if (at)
866 			*at = '\0';
867 	}
868 	limit = avail - col;
869 	err = format_line(&wauthor, &author_width, author, limit);
870 	if (err)
871 		goto done;
872 	waddwstr(view->window, wauthor);
873 	col += author_width;
874 	while (col <= avail && author_width < author_display_cols + 1) {
875 		waddch(view->window, ' ');
876 		col++;
877 		author_width++;
878 	}
879 	if (col > avail)
880 		goto done;
881 
882 	logmsg0 = strdup(commit->logmsg);
883 	if (logmsg0 == NULL) {
884 		err = got_error_from_errno();
885 		goto done;
886 	}
887 	logmsg = logmsg0;
888 	while (*logmsg == '\n')
889 		logmsg++;
890 	newline = strchr(logmsg, '\n');
891 	if (newline)
892 		*newline = '\0';
893 	limit = avail - col;
894 	err = format_line(&wlogmsg, &logmsg_width, logmsg, limit);
895 	if (err)
896 		goto done;
897 	waddwstr(view->window, wlogmsg);
898 	col += logmsg_width;
899 	while (col <= avail) {
900 		waddch(view->window, ' ');
901 		col++;
902 	}
903 done:
904 	free(logmsg0);
905 	free(wlogmsg);
906 	free(author0);
907 	free(wauthor);
908 	free(line);
909 	return err;
910 }
911 
912 static struct commit_queue_entry *
913 alloc_commit_queue_entry(struct got_commit_object *commit,
914     struct got_object_id *id)
915 {
916 	struct commit_queue_entry *entry;
917 
918 	entry = calloc(1, sizeof(*entry));
919 	if (entry == NULL)
920 		return NULL;
921 
922 	entry->id = id;
923 	entry->commit = commit;
924 	return entry;
925 }
926 
927 static void
928 pop_commit(struct commit_queue *commits)
929 {
930 	struct commit_queue_entry *entry;
931 
932 	entry = TAILQ_FIRST(&commits->head);
933 	TAILQ_REMOVE(&commits->head, entry, entry);
934 	got_object_commit_close(entry->commit);
935 	commits->ncommits--;
936 	/* Don't free entry->id! It is owned by the commit graph. */
937 	free(entry);
938 }
939 
940 static void
941 free_commits(struct commit_queue *commits)
942 {
943 	while (!TAILQ_EMPTY(&commits->head))
944 		pop_commit(commits);
945 }
946 
947 static const struct got_error *
948 queue_commits(struct got_commit_graph *graph, struct commit_queue *commits,
949     int minqueue, struct got_repository *repo, const char *path)
950 {
951 	const struct got_error *err = NULL;
952 	int nqueued = 0;
953 
954 	/*
955 	 * We keep all commits open throughout the lifetime of the log
956 	 * view in order to avoid having to re-fetch commits from disk
957 	 * while updating the display.
958 	 */
959 	while (nqueued < minqueue) {
960 		struct got_object_id *id;
961 		struct got_commit_object *commit;
962 		struct commit_queue_entry *entry;
963 		int errcode;
964 
965 		err = got_commit_graph_iter_next(&id, graph);
966 		if (err) {
967 			if (err->code != GOT_ERR_ITER_NEED_MORE)
968 				break;
969 			err = got_commit_graph_fetch_commits(graph,
970 			    minqueue, repo);
971 			if (err)
972 				return err;
973 			continue;
974 		}
975 
976 		if (id == NULL)
977 			break;
978 
979 		err = got_object_open_as_commit(&commit, repo, id);
980 		if (err)
981 			break;
982 		entry = alloc_commit_queue_entry(commit, id);
983 		if (entry == NULL) {
984 			err = got_error_from_errno();
985 			break;
986 		}
987 
988 		errcode = pthread_mutex_lock(&tog_mutex);
989 		if (errcode) {
990 			err = got_error_set_errno(errcode);
991 			break;
992 		}
993 
994 		entry->idx = commits->ncommits;
995 		TAILQ_INSERT_TAIL(&commits->head, entry, entry);
996 		nqueued++;
997 		commits->ncommits++;
998 
999 		errcode = pthread_mutex_unlock(&tog_mutex);
1000 		if (errcode && err == NULL)
1001 			err = got_error_set_errno(errcode);
1002 	}
1003 
1004 	return err;
1005 }
1006 
1007 static const struct got_error *
1008 get_head_commit_id(struct got_object_id **head_id, struct got_repository *repo)
1009 {
1010 	const struct got_error *err = NULL;
1011 	struct got_reference *head_ref;
1012 
1013 	*head_id = NULL;
1014 
1015 	err = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
1016 	if (err)
1017 		return err;
1018 
1019 	err = got_ref_resolve(head_id, repo, head_ref);
1020 	got_ref_close(head_ref);
1021 	if (err) {
1022 		*head_id = NULL;
1023 		return err;
1024 	}
1025 
1026 	return NULL;
1027 }
1028 
1029 static const struct got_error *
1030 draw_commits(struct tog_view *view, struct commit_queue_entry **last,
1031     struct commit_queue_entry **selected, struct commit_queue_entry *first,
1032     struct commit_queue *commits, int selected_idx, int limit,
1033     const char *path, int commits_needed)
1034 {
1035 	const struct got_error *err = NULL;
1036 	struct commit_queue_entry *entry;
1037 	int ncommits, width;
1038 	char *id_str = NULL, *header = NULL, *ncommits_str = NULL;
1039 	wchar_t *wline;
1040 
1041 	entry = first;
1042 	ncommits = 0;
1043 	while (entry) {
1044 		if (ncommits == selected_idx) {
1045 			*selected = entry;
1046 			break;
1047 		}
1048 		entry = TAILQ_NEXT(entry, entry);
1049 		ncommits++;
1050 	}
1051 
1052 	if (*selected) {
1053 		err = got_object_id_str(&id_str, (*selected)->id);
1054 		if (err)
1055 			return err;
1056 	}
1057 
1058 	if (asprintf(&ncommits_str, " [%d/%d]%s ",
1059 	    entry ? entry->idx + 1 : 0, commits->ncommits,
1060 	    commits_needed == 0 ? "" : " loading...") == -1)
1061 		return got_error_from_errno();
1062 
1063 	if (path && strcmp(path, "/") != 0) {
1064 		if (asprintf(&header, "commit: %s %s%s",
1065 		    id_str ? id_str : "........................................",
1066 		    path, ncommits_str) == -1) {
1067 			err = got_error_from_errno();
1068 			header = NULL;
1069 			goto done;
1070 		}
1071 	} else if (asprintf(&header, "commit: %s%s",
1072 	    id_str ? id_str : "........................................",
1073 	    ncommits_str) == -1) {
1074 		err = got_error_from_errno();
1075 		header = NULL;
1076 		goto done;
1077 	}
1078 	err = format_line(&wline, &width, header, view->ncols);
1079 	if (err)
1080 		goto done;
1081 
1082 	werase(view->window);
1083 
1084 	if (view_needs_focus_indication(view))
1085 		wstandout(view->window);
1086 	waddwstr(view->window, wline);
1087 	while (width < view->ncols) {
1088 		waddch(view->window, ' ');
1089 		width++;
1090 	}
1091 	if (view_needs_focus_indication(view))
1092 		wstandend(view->window);
1093 	free(wline);
1094 	if (limit <= 1)
1095 		goto done;
1096 
1097 	entry = first;
1098 	*last = first;
1099 	ncommits = 0;
1100 	while (entry) {
1101 		if (ncommits >= limit - 1)
1102 			break;
1103 		if (view->focussed && ncommits == selected_idx)
1104 			wstandout(view->window);
1105 		err = draw_commit(view, entry->commit, entry->id);
1106 		if (view->focussed && ncommits == selected_idx)
1107 			wstandend(view->window);
1108 		if (err)
1109 			break;
1110 		ncommits++;
1111 		*last = entry;
1112 		entry = TAILQ_NEXT(entry, entry);
1113 	}
1114 
1115 	view_vborder(view);
1116 done:
1117 	free(id_str);
1118 	free(ncommits_str);
1119 	free(header);
1120 	return err;
1121 }
1122 
1123 static void
1124 scroll_up(struct commit_queue_entry **first_displayed_entry, int maxscroll,
1125     struct commit_queue *commits)
1126 {
1127 	struct commit_queue_entry *entry;
1128 	int nscrolled = 0;
1129 
1130 	entry = TAILQ_FIRST(&commits->head);
1131 	if (*first_displayed_entry == entry)
1132 		return;
1133 
1134 	entry = *first_displayed_entry;
1135 	while (entry && nscrolled < maxscroll) {
1136 		entry = TAILQ_PREV(entry, commit_queue_head, entry);
1137 		if (entry) {
1138 			*first_displayed_entry = entry;
1139 			nscrolled++;
1140 		}
1141 	}
1142 }
1143 
1144 static const struct got_error *
1145 scroll_down(struct commit_queue_entry **first_displayed_entry, int maxscroll,
1146     struct commit_queue_entry **last_displayed_entry,
1147     struct commit_queue *commits, int *log_complete, int *commits_needed,
1148     pthread_cond_t *need_commits)
1149 {
1150 	const struct got_error *err = NULL;
1151 	struct commit_queue_entry *pentry;
1152 	int nscrolled = 0;
1153 
1154 	if (*last_displayed_entry == NULL)
1155 		return NULL;
1156 
1157 	do {
1158 		pentry = TAILQ_NEXT(*last_displayed_entry, entry);
1159 		if (pentry == NULL) {
1160 			int errcode;
1161 			if (*log_complete)
1162 				return NULL;
1163 			*commits_needed = maxscroll + 20;
1164 			errcode = pthread_cond_signal(need_commits);
1165 			if (errcode)
1166 				return got_error_set_errno(errcode);
1167 			return NULL;
1168 		}
1169 		*last_displayed_entry = pentry;
1170 
1171 		pentry = TAILQ_NEXT(*first_displayed_entry, entry);
1172 		if (pentry == NULL)
1173 			break;
1174 		*first_displayed_entry = pentry;
1175 	} while (++nscrolled < maxscroll);
1176 
1177 	return err;
1178 }
1179 
1180 static const struct got_error *
1181 open_diff_view_for_commit(struct tog_view **new_view, int begin_x,
1182     struct got_object_id *commit_id, struct got_commit_object *commit,
1183     struct got_repository *repo)
1184 {
1185 	const struct got_error *err;
1186 	struct got_object *obj1 = NULL, *obj2 = NULL;
1187 	struct got_object_qid *parent_id;
1188 	struct tog_view *diff_view;
1189 
1190 	err = got_object_open(&obj2, repo, commit_id);
1191 	if (err)
1192 		return err;
1193 
1194 	parent_id = SIMPLEQ_FIRST(&commit->parent_ids);
1195 	if (parent_id) {
1196 		err = got_object_open(&obj1, repo, parent_id->id);
1197 		if (err)
1198 			goto done;
1199 	}
1200 
1201 	diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
1202 	if (diff_view == NULL) {
1203 		err = got_error_from_errno();
1204 		goto done;
1205 	}
1206 
1207 	err = open_diff_view(diff_view, obj1, obj2, repo);
1208 	if (err == NULL)
1209 		*new_view = diff_view;
1210 done:
1211 	if (obj1)
1212 		got_object_close(obj1);
1213 	if (obj2)
1214 		got_object_close(obj2);
1215 	return err;
1216 }
1217 
1218 static const struct got_error *
1219 browse_commit(struct tog_view **new_view, int begin_x,
1220     struct commit_queue_entry *entry, struct got_repository *repo)
1221 {
1222 	const struct got_error *err = NULL;
1223 	struct got_tree_object *tree;
1224 	struct tog_view *tree_view;
1225 
1226 	err = got_object_open_as_tree(&tree, repo, entry->commit->tree_id);
1227 	if (err)
1228 		return err;
1229 
1230 	tree_view = view_open(0, 0, 0, begin_x, TOG_VIEW_TREE);
1231 	if (tree_view == NULL)
1232 		return got_error_from_errno();
1233 
1234 	err = open_tree_view(tree_view, tree, entry->id, repo);
1235 	if (err)
1236 		got_object_tree_close(tree);
1237 	else
1238 		*new_view = tree_view;
1239 	return err;
1240 }
1241 
1242 static void *
1243 log_thread(void *arg)
1244 {
1245 	const struct got_error *err = NULL;
1246 	int errcode = 0;
1247 	struct tog_log_thread_args *a = arg;
1248 	int done = 0;
1249 
1250 	err = got_commit_graph_iter_start(a->graph, a->start_id, a->repo);
1251 	if (err)
1252 		return (void *)err;
1253 
1254 	while (!done && !err) {
1255 		err = queue_commits(a->graph, a->commits, 1, a->repo,
1256 		    a->in_repo_path);
1257 		if (err) {
1258 			if (err->code != GOT_ERR_ITER_COMPLETED)
1259 				return (void *)err;
1260 			err = NULL;
1261 			done = 1;
1262 		} else if (a->commits_needed > 0)
1263 			a->commits_needed--;
1264 
1265 		errcode = pthread_mutex_lock(&tog_mutex);
1266 		if (errcode)
1267 			return (void *)got_error_set_errno(errcode);
1268 
1269 		if (done)
1270 			a->log_complete = 1;
1271 		else if (*a->quit) {
1272 			done = 1;
1273 			a->log_complete = 1;
1274 		} else if (*a->first_displayed_entry == NULL) {
1275 			*a->first_displayed_entry =
1276 			    TAILQ_FIRST(&a->commits->head);
1277 			*a->selected_entry = *a->first_displayed_entry;
1278 		}
1279 
1280 		err = draw_commits(a->view, a->last_displayed_entry,
1281 		    a->selected_entry, *a->first_displayed_entry,
1282 		    a->commits, *a->selected, a->view->nlines,
1283 		    a->in_repo_path, a->commits_needed);
1284 #if 0 /* XXX ncurses isn't thread-safe */
1285 	if (!err) {
1286 		update_panels();
1287 		doupdate();
1288 	}
1289 #endif
1290 		if (done)
1291 			a->commits_needed = 0;
1292 		else if (a->commits_needed == 0) {
1293 			errcode = pthread_cond_wait(&a->need_commits,
1294 			    &tog_mutex);
1295 			if (errcode)
1296 				err = got_error_set_errno(errcode);
1297 		}
1298 
1299 		errcode = pthread_mutex_unlock(&tog_mutex);
1300 		if (errcode && err == NULL)
1301 			err = got_error_set_errno(errcode);
1302 	}
1303 	return (void *)err;
1304 }
1305 
1306 static const struct got_error *
1307 stop_log_thread(struct tog_log_view_state *s)
1308 {
1309 	const struct got_error *err = NULL;
1310 	int errcode;
1311 
1312 	if (s->thread) {
1313 		s->quit = 1;
1314 		errcode = pthread_cond_signal(&s->thread_args.need_commits);
1315 		if (errcode)
1316 			return got_error_set_errno(errcode);
1317 		errcode = pthread_mutex_unlock(&tog_mutex);
1318 		if (errcode)
1319 			return got_error_set_errno(errcode);
1320 		errcode = pthread_join(s->thread, (void **)&err);
1321 		if (errcode)
1322 			return got_error_set_errno(errcode);
1323 		errcode = pthread_mutex_lock(&tog_mutex);
1324 		if (errcode)
1325 			return got_error_set_errno(errcode);
1326 		s->thread = NULL;
1327 	}
1328 
1329 	errcode = pthread_cond_destroy(&s->thread_args.need_commits);
1330 	if (errcode && err == NULL)
1331 		err = got_error_set_errno(errcode);
1332 
1333 	if (s->thread_args.repo) {
1334 		got_repo_close(s->thread_args.repo);
1335 		s->thread_args.repo = NULL;
1336 	}
1337 
1338 	if (s->thread_args.graph) {
1339 		got_commit_graph_close(s->thread_args.graph);
1340 		s->thread_args.graph = NULL;
1341 	}
1342 
1343 	return err;
1344 }
1345 
1346 static const struct got_error *
1347 close_log_view(struct tog_view *view)
1348 {
1349 	const struct got_error *err = NULL;
1350 	struct tog_log_view_state *s = &view->state.log;
1351 
1352 	err = stop_log_thread(s);
1353 	free_commits(&s->commits);
1354 	free(s->in_repo_path);
1355 	free(s->start_id);
1356 	return err;
1357 }
1358 
1359 static const struct got_error *
1360 open_log_view(struct tog_view *view, struct got_object_id *start_id,
1361     struct got_repository *repo, const char *path)
1362 {
1363 	const struct got_error *err = NULL;
1364 	struct tog_log_view_state *s = &view->state.log;
1365 	struct got_repository *thread_repo = NULL;
1366 	struct got_commit_graph *thread_graph = NULL;
1367 	int errcode;
1368 
1369 	err = got_repo_map_path(&s->in_repo_path, repo, path);
1370 	if (err != NULL)
1371 		goto done;
1372 
1373 	/* The commit queue only contains commits being displayed. */
1374 	TAILQ_INIT(&s->commits.head);
1375 	s->commits.ncommits = 0;
1376 
1377 	s->repo = repo;
1378 	s->start_id = got_object_id_dup(start_id);
1379 	if (s->start_id == NULL) {
1380 		err = got_error_from_errno();
1381 		goto done;
1382 	}
1383 
1384 	view->show = show_log_view;
1385 	view->input = input_log_view;
1386 	view->close = close_log_view;
1387 
1388 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
1389 	if (err)
1390 		goto done;
1391 	err = got_commit_graph_open(&thread_graph, start_id, s->in_repo_path,
1392 	    0, thread_repo);
1393 	if (err)
1394 		goto done;
1395 
1396 	errcode = pthread_cond_init(&s->thread_args.need_commits, NULL);
1397 	if (errcode) {
1398 		err = got_error_set_errno(errcode);
1399 		goto done;
1400 	}
1401 
1402 	s->thread_args.commits_needed = view->nlines;
1403 	s->thread_args.graph = thread_graph;
1404 	s->thread_args.commits = &s->commits;
1405 	s->thread_args.in_repo_path = s->in_repo_path;
1406 	s->thread_args.start_id = s->start_id;
1407 	s->thread_args.repo = thread_repo;
1408 	s->thread_args.log_complete = 0;
1409 	s->thread_args.quit = &s->quit;
1410 	s->thread_args.view = view;
1411 	s->thread_args.first_displayed_entry = &s->first_displayed_entry;
1412 	s->thread_args.last_displayed_entry = &s->last_displayed_entry;
1413 	s->thread_args.selected_entry = &s->selected_entry;
1414 	s->thread_args.selected = &s->selected;
1415 
1416 	errcode = pthread_create(&s->thread, NULL, log_thread,
1417 	    &s->thread_args);
1418 	if (errcode) {
1419 		err = got_error_set_errno(errcode);
1420 		goto done;
1421 	}
1422 
1423 done:
1424 	if (err)
1425 		close_log_view(view);
1426 	return err;
1427 }
1428 
1429 static const struct got_error *
1430 show_log_view(struct tog_view *view)
1431 {
1432 	struct tog_log_view_state *s = &view->state.log;
1433 
1434 	return draw_commits(view, &s->last_displayed_entry,
1435 	    &s->selected_entry, s->first_displayed_entry,
1436 	    &s->commits, s->selected, view->nlines,
1437 	    s->in_repo_path, s->thread_args.commits_needed);
1438 }
1439 
1440 static const struct got_error *
1441 input_log_view(struct tog_view **new_view, struct tog_view **dead_view,
1442     struct tog_view **focus_view, struct tog_view *view, int ch)
1443 {
1444 	const struct got_error *err = NULL;
1445 	struct tog_log_view_state *s = &view->state.log;
1446 	char *parent_path;
1447 	struct tog_view *diff_view = NULL, *tree_view = NULL;
1448 	int begin_x = 0;
1449 
1450 	switch (ch) {
1451 		case 'q':
1452 			s->quit = 1;
1453 			break;
1454 		case 'k':
1455 		case KEY_UP:
1456 			if (s->selected > 0)
1457 				s->selected--;
1458 			if (s->selected > 0)
1459 				break;
1460 			scroll_up(&s->first_displayed_entry, 1,
1461 			    &s->commits);
1462 			break;
1463 		case KEY_PPAGE:
1464 			if (TAILQ_FIRST(&s->commits.head) ==
1465 			    s->first_displayed_entry) {
1466 				s->selected = 0;
1467 				break;
1468 			}
1469 			scroll_up(&s->first_displayed_entry,
1470 			    view->nlines, &s->commits);
1471 			break;
1472 		case 'j':
1473 		case KEY_DOWN:
1474 			if (s->selected < MIN(view->nlines - 2,
1475 			    s->commits.ncommits - 1)) {
1476 				s->selected++;
1477 				break;
1478 			}
1479 			err = scroll_down(&s->first_displayed_entry, 1,
1480 			    &s->last_displayed_entry, &s->commits,
1481 			    &s->thread_args.log_complete,
1482 			    &s->thread_args.commits_needed,
1483 			    &s->thread_args.need_commits);
1484 			break;
1485 		case KEY_NPAGE: {
1486 			struct commit_queue_entry *first;
1487 			first = s->first_displayed_entry;
1488 			err = scroll_down(&s->first_displayed_entry,
1489 			    view->nlines, &s->last_displayed_entry,
1490 			    &s->commits, &s->thread_args.log_complete,
1491 			    &s->thread_args.commits_needed,
1492 			    &s->thread_args.need_commits);
1493 			if (first == s->first_displayed_entry &&
1494 			    s->selected < MIN(view->nlines - 2,
1495 			    s->commits.ncommits - 1)) {
1496 				/* can't scroll further down */
1497 				s->selected = MIN(view->nlines - 2,
1498 				    s->commits.ncommits - 1);
1499 			}
1500 			err = NULL;
1501 			break;
1502 		}
1503 		case KEY_RESIZE:
1504 			if (s->selected > view->nlines - 2)
1505 				s->selected = view->nlines - 2;
1506 			if (s->selected > s->commits.ncommits - 1)
1507 				s->selected = s->commits.ncommits - 1;
1508 			break;
1509 		case KEY_ENTER:
1510 		case '\r':
1511 			if (view_is_parent_view(view))
1512 				begin_x = view_split_begin_x(view->begin_x);
1513 			err = open_diff_view_for_commit(&diff_view, begin_x,
1514 			    s->selected_entry->id, s->selected_entry->commit,
1515 			    s->repo);
1516 			if (err)
1517 				break;
1518 			if (view_is_parent_view(view)) {
1519 				err = view_close_child(view);
1520 				if (err)
1521 					return err;
1522 				err = view_set_child(view, diff_view);
1523 				if (err) {
1524 					view_close(diff_view);
1525 					break;
1526 				}
1527 				if (!view_is_splitscreen(diff_view)) {
1528 					*focus_view = diff_view;
1529 					view->child_focussed = 1;
1530 				}
1531 			} else
1532 				*new_view = diff_view;
1533 			break;
1534 		case 't':
1535 			if (view_is_parent_view(view))
1536 				begin_x = view_split_begin_x(view->begin_x);
1537 			err = browse_commit(&tree_view, begin_x,
1538 			    s->selected_entry, s->repo);
1539 			if (view_is_parent_view(view)) {
1540 				err = view_close_child(view);
1541 				if (err)
1542 					return err;
1543 				err = view_set_child(view, tree_view);
1544 				if (err) {
1545 					view_close(tree_view);
1546 					break;
1547 				}
1548 				*focus_view = tree_view;
1549 				view->child_focussed = 1;
1550 			} else
1551 				*new_view = tree_view;
1552 			break;
1553 		case KEY_BACKSPACE:
1554 			if (strcmp(s->in_repo_path, "/") == 0)
1555 				break;
1556 			parent_path = dirname(s->in_repo_path);
1557 			if (parent_path && strcmp(parent_path, ".") != 0) {
1558 				struct tog_view *lv;
1559 				err = stop_log_thread(s);
1560 				if (err)
1561 					return err;
1562 				lv = view_open(view->nlines, view->ncols,
1563 				    view->begin_y, view->begin_x, TOG_VIEW_LOG);
1564 				if (lv == NULL)
1565 					return got_error_from_errno();
1566 				err = open_log_view(lv, s->start_id, s->repo,
1567 				    parent_path);
1568 				if (err)
1569 					return err;;
1570 				if (view_is_parent_view(view))
1571 					*new_view = lv;
1572 				else {
1573 					view_set_child(view->parent, lv);
1574 					*dead_view = view;
1575 				}
1576 				return NULL;
1577 			}
1578 			break;
1579 		default:
1580 			break;
1581 	}
1582 
1583 	return err;
1584 }
1585 
1586 static const struct got_error *
1587 cmd_log(int argc, char *argv[])
1588 {
1589 	const struct got_error *error;
1590 	struct got_repository *repo = NULL;
1591 	struct got_object_id *start_id = NULL;
1592 	char *path = NULL, *repo_path = NULL, *cwd = NULL;
1593 	char *start_commit = NULL;
1594 	int ch;
1595 	struct tog_view *view;
1596 
1597 #ifndef PROFILE
1598 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd", NULL)
1599 	    == -1)
1600 		err(1, "pledge");
1601 #endif
1602 
1603 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
1604 		switch (ch) {
1605 		case 'c':
1606 			start_commit = optarg;
1607 			break;
1608 		case 'r':
1609 			repo_path = realpath(optarg, NULL);
1610 			if (repo_path == NULL)
1611 				err(1, "-r option");
1612 			break;
1613 		default:
1614 			usage();
1615 			/* NOTREACHED */
1616 		}
1617 	}
1618 
1619 	argc -= optind;
1620 	argv += optind;
1621 
1622 	if (argc == 0)
1623 		path = strdup("");
1624 	else if (argc == 1)
1625 		path = strdup(argv[0]);
1626 	else
1627 		usage_log();
1628 	if (path == NULL)
1629 		return got_error_from_errno();
1630 
1631 	cwd = getcwd(NULL, 0);
1632 	if (cwd == NULL) {
1633 		error = got_error_from_errno();
1634 		goto done;
1635 	}
1636 	if (repo_path == NULL) {
1637 		repo_path = strdup(cwd);
1638 		if (repo_path == NULL) {
1639 			error = got_error_from_errno();
1640 			goto done;
1641 		}
1642 	}
1643 
1644 	error = got_repo_open(&repo, repo_path);
1645 	if (error != NULL)
1646 		goto done;
1647 
1648 	if (start_commit == NULL) {
1649 		error = get_head_commit_id(&start_id, repo);
1650 		if (error != NULL)
1651 			goto done;
1652 	} else {
1653 		struct got_object *obj;
1654 		error = got_object_open_by_id_str(&obj, repo, start_commit);
1655 		if (error == NULL) {
1656 			start_id = got_object_id_dup(got_object_get_id(obj));
1657 			if (start_id == NULL)
1658 				error = got_error_from_errno();
1659 				goto done;
1660 		}
1661 	}
1662 	if (error != NULL)
1663 		goto done;
1664 
1665 	view = view_open(0, 0, 0, 0, TOG_VIEW_LOG);
1666 	if (view == NULL) {
1667 		error = got_error_from_errno();
1668 		goto done;
1669 	}
1670 	error = open_log_view(view, start_id, repo, path);
1671 	if (error)
1672 		goto done;
1673 	error = view_loop(view);
1674 done:
1675 	free(repo_path);
1676 	free(cwd);
1677 	free(path);
1678 	free(start_id);
1679 	if (repo)
1680 		got_repo_close(repo);
1681 	return error;
1682 }
1683 
1684 __dead static void
1685 usage_diff(void)
1686 {
1687 	endwin();
1688 	fprintf(stderr, "usage: %s diff [repository-path] object1 object2\n",
1689 	    getprogname());
1690 	exit(1);
1691 }
1692 
1693 static char *
1694 parse_next_line(FILE *f, size_t *len)
1695 {
1696 	char *line;
1697 	size_t linelen;
1698 	size_t lineno;
1699 	const char delim[3] = { '\0', '\0', '\0'};
1700 
1701 	line = fparseln(f, &linelen, &lineno, delim, 0);
1702 	if (len)
1703 		*len = linelen;
1704 	return line;
1705 }
1706 
1707 static const struct got_error *
1708 draw_file(struct tog_view *view, FILE *f, int *first_displayed_line,
1709     int *last_displayed_line, int *eof, int max_lines,
1710     char * header)
1711 {
1712 	const struct got_error *err;
1713 	int nlines = 0, nprinted = 0;
1714 	char *line;
1715 	size_t len;
1716 	wchar_t *wline;
1717 	int width;
1718 
1719 	rewind(f);
1720 	werase(view->window);
1721 
1722 	if (header) {
1723 		err = format_line(&wline, &width, header, view->ncols);
1724 		if (err) {
1725 			return err;
1726 		}
1727 
1728 		if (view_needs_focus_indication(view))
1729 			wstandout(view->window);
1730 		waddwstr(view->window, wline);
1731 		if (view_needs_focus_indication(view))
1732 			wstandend(view->window);
1733 		if (width < view->ncols)
1734 			waddch(view->window, '\n');
1735 
1736 		if (max_lines <= 1)
1737 			return NULL;
1738 		max_lines--;
1739 	}
1740 
1741 	*eof = 0;
1742 	while (nprinted < max_lines) {
1743 		line = parse_next_line(f, &len);
1744 		if (line == NULL) {
1745 			*eof = 1;
1746 			break;
1747 		}
1748 		if (++nlines < *first_displayed_line) {
1749 			free(line);
1750 			continue;
1751 		}
1752 
1753 		err = format_line(&wline, &width, line, view->ncols);
1754 		if (err) {
1755 			free(line);
1756 			return err;
1757 		}
1758 		waddwstr(view->window, wline);
1759 		if (width < view->ncols)
1760 			waddch(view->window, '\n');
1761 		if (++nprinted == 1)
1762 			*first_displayed_line = nlines;
1763 		free(line);
1764 		free(wline);
1765 		wline = NULL;
1766 	}
1767 	*last_displayed_line = nlines;
1768 
1769 	view_vborder(view);
1770 
1771 	return NULL;
1772 }
1773 
1774 static const struct got_error *
1775 create_diff(struct tog_diff_view_state *s)
1776 {
1777 	const struct got_error *err = NULL;
1778 	struct got_object *obj1 = NULL, *obj2 = NULL;
1779 	FILE *f = NULL;
1780 
1781 	if (s->id1) {
1782 		err = got_object_open(&obj1, s->repo, s->id1);
1783 		if (err)
1784 			return err;
1785 	}
1786 
1787 	err = got_object_open(&obj2, s->repo, s->id2);
1788 	if (err)
1789 		goto done;
1790 
1791 	f = got_opentemp();
1792 	if (f == NULL) {
1793 		err = got_error_from_errno();
1794 		goto done;
1795 	}
1796 	if (s->f)
1797 		fclose(s->f);
1798 	s->f = f;
1799 
1800 	switch (got_object_get_type(obj1 ? obj1 : obj2)) {
1801 	case GOT_OBJ_TYPE_BLOB:
1802 		err = got_diff_objects_as_blobs(obj1, obj2, NULL, NULL,
1803 		    s->diff_context, s->repo, f);
1804 		break;
1805 	case GOT_OBJ_TYPE_TREE:
1806 		err = got_diff_objects_as_trees(obj1, obj2, "", "",
1807 		    s->diff_context, s->repo, f);
1808 		break;
1809 	case GOT_OBJ_TYPE_COMMIT:
1810 		err = got_diff_objects_as_commits(obj1, obj2, s->diff_context,
1811 		    s->repo, f);
1812 		break;
1813 	default:
1814 		err = got_error(GOT_ERR_OBJ_TYPE);
1815 		break;
1816 	}
1817 done:
1818 	if (obj1)
1819 		got_object_close(obj1);
1820 	got_object_close(obj2);
1821 	if (f)
1822 		fflush(f);
1823 	return err;
1824 }
1825 
1826 static const struct got_error *
1827 open_diff_view(struct tog_view *view, struct got_object *obj1,
1828     struct got_object *obj2, struct got_repository *repo)
1829 {
1830 	const struct got_error *err;
1831 
1832 	if (obj1 != NULL && obj2 != NULL &&
1833 	    got_object_get_type(obj1) != got_object_get_type(obj2))
1834 		return got_error(GOT_ERR_OBJ_TYPE);
1835 
1836 	if (obj1) {
1837 		struct got_object_id *id1;
1838 		id1 = got_object_id_dup(got_object_get_id(obj1));
1839 		if (id1 == NULL)
1840 			return got_error_from_errno();
1841 		view->state.diff.id1 = id1;
1842 	} else
1843 		view->state.diff.id1 = NULL;
1844 
1845 	view->state.diff.id2 = got_object_id_dup(got_object_get_id(obj2));
1846 	if (view->state.diff.id2 == NULL) {
1847 		free(view->state.diff.id1);
1848 		view->state.diff.id1 = NULL;
1849 		return got_error_from_errno();
1850 	}
1851 	view->state.diff.f = NULL;
1852 	view->state.diff.first_displayed_line = 1;
1853 	view->state.diff.last_displayed_line = view->nlines;
1854 	view->state.diff.diff_context = 3;
1855 	view->state.diff.repo = repo;
1856 
1857 	err = create_diff(&view->state.diff);
1858 	if (err) {
1859 		free(view->state.diff.id1);
1860 		view->state.diff.id1 = NULL;
1861 		free(view->state.diff.id2);
1862 		view->state.diff.id2 = NULL;
1863 		return err;
1864 	}
1865 
1866 	view->show = show_diff_view;
1867 	view->input = input_diff_view;
1868 	view->close = close_diff_view;
1869 
1870 	return NULL;
1871 }
1872 
1873 static const struct got_error *
1874 close_diff_view(struct tog_view *view)
1875 {
1876 	const struct got_error *err = NULL;
1877 
1878 	free(view->state.diff.id1);
1879 	view->state.diff.id1 = NULL;
1880 	free(view->state.diff.id2);
1881 	view->state.diff.id2 = NULL;
1882 	if (view->state.diff.f && fclose(view->state.diff.f) == EOF)
1883 		err = got_error_from_errno();
1884 	return err;
1885 }
1886 
1887 static const struct got_error *
1888 show_diff_view(struct tog_view *view)
1889 {
1890 	const struct got_error *err;
1891 	struct tog_diff_view_state *s = &view->state.diff;
1892 	char *id_str1 = NULL, *id_str2, *header;
1893 
1894 	if (s->id1) {
1895 		err = got_object_id_str(&id_str1, s->id1);
1896 		if (err)
1897 			return err;
1898 	}
1899 	err = got_object_id_str(&id_str2, s->id2);
1900 	if (err)
1901 		return err;
1902 
1903 	if (asprintf(&header, "diff: %s %s",
1904 	    id_str1 ? id_str1 : "/dev/null", id_str2) == -1) {
1905 		err = got_error_from_errno();
1906 		free(id_str1);
1907 		free(id_str2);
1908 		return err;
1909 	}
1910 	free(id_str1);
1911 	free(id_str2);
1912 
1913 	return draw_file(view, s->f, &s->first_displayed_line,
1914 	    &s->last_displayed_line, &s->eof, view->nlines,
1915 	    header);
1916 }
1917 
1918 static const struct got_error *
1919 input_diff_view(struct tog_view **new_view, struct tog_view **dead_view,
1920     struct tog_view **focus_view, struct tog_view *view, int ch)
1921 {
1922 	const struct got_error *err = NULL;
1923 	struct tog_diff_view_state *s = &view->state.diff;
1924 	int i;
1925 
1926 	switch (ch) {
1927 		case 'k':
1928 		case KEY_UP:
1929 			if (s->first_displayed_line > 1)
1930 				s->first_displayed_line--;
1931 			break;
1932 		case KEY_PPAGE:
1933 			i = 0;
1934 			while (i++ < view->nlines - 1 &&
1935 			    s->first_displayed_line > 1)
1936 				s->first_displayed_line--;
1937 			break;
1938 		case 'j':
1939 		case KEY_DOWN:
1940 			if (!s->eof)
1941 				s->first_displayed_line++;
1942 			break;
1943 		case KEY_NPAGE:
1944 		case ' ':
1945 			i = 0;
1946 			while (!s->eof && i++ < view->nlines - 1) {
1947 				char *line;
1948 				line = parse_next_line(s->f, NULL);
1949 				s->first_displayed_line++;
1950 				if (line == NULL)
1951 					break;
1952 			}
1953 			break;
1954 		case '[':
1955 			if (s->diff_context > 0) {
1956 				s->diff_context--;
1957 				err = create_diff(s);
1958 			}
1959 			break;
1960 		case ']':
1961 			if (s->diff_context < GOT_DIFF_MAX_CONTEXT) {
1962 				s->diff_context++;
1963 				err = create_diff(s);
1964 			}
1965 			break;
1966 		default:
1967 			break;
1968 	}
1969 
1970 	return err;
1971 }
1972 
1973 static const struct got_error *
1974 cmd_diff(int argc, char *argv[])
1975 {
1976 	const struct got_error *error = NULL;
1977 	struct got_repository *repo = NULL;
1978 	struct got_object *obj1 = NULL, *obj2 = NULL;
1979 	char *repo_path = NULL;
1980 	char *obj_id_str1 = NULL, *obj_id_str2 = NULL;
1981 	int ch;
1982 	struct tog_view *view;
1983 
1984 #ifndef PROFILE
1985 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd", NULL)
1986 	    == -1)
1987 		err(1, "pledge");
1988 #endif
1989 
1990 	while ((ch = getopt(argc, argv, "")) != -1) {
1991 		switch (ch) {
1992 		default:
1993 			usage();
1994 			/* NOTREACHED */
1995 		}
1996 	}
1997 
1998 	argc -= optind;
1999 	argv += optind;
2000 
2001 	if (argc == 0) {
2002 		usage_diff(); /* TODO show local worktree changes */
2003 	} else if (argc == 2) {
2004 		repo_path = getcwd(NULL, 0);
2005 		if (repo_path == NULL)
2006 			return got_error_from_errno();
2007 		obj_id_str1 = argv[0];
2008 		obj_id_str2 = argv[1];
2009 	} else if (argc == 3) {
2010 		repo_path = realpath(argv[0], NULL);
2011 		if (repo_path == NULL)
2012 			return got_error_from_errno();
2013 		obj_id_str1 = argv[1];
2014 		obj_id_str2 = argv[2];
2015 	} else
2016 		usage_diff();
2017 
2018 	error = got_repo_open(&repo, repo_path);
2019 	free(repo_path);
2020 	if (error)
2021 		goto done;
2022 
2023 	error = got_object_open_by_id_str(&obj1, repo, obj_id_str1);
2024 	if (error)
2025 		goto done;
2026 
2027 	error = got_object_open_by_id_str(&obj2, repo, obj_id_str2);
2028 	if (error)
2029 		goto done;
2030 
2031 	view = view_open(0, 0, 0, 0, TOG_VIEW_DIFF);
2032 	if (view == NULL) {
2033 		error = got_error_from_errno();
2034 		goto done;
2035 	}
2036 	error = open_diff_view(view, obj1, obj2, repo);
2037 	if (error)
2038 		goto done;
2039 	error = view_loop(view);
2040 done:
2041 	got_repo_close(repo);
2042 	if (obj1)
2043 		got_object_close(obj1);
2044 	if (obj2)
2045 		got_object_close(obj2);
2046 	return error;
2047 }
2048 
2049 __dead static void
2050 usage_blame(void)
2051 {
2052 	endwin();
2053 	fprintf(stderr, "usage: %s blame [-c commit] [-r repository-path] path\n",
2054 	    getprogname());
2055 	exit(1);
2056 }
2057 
2058 struct tog_blame_line {
2059 	int annotated;
2060 	struct got_object_id *id;
2061 };
2062 
2063 static const struct got_error *
2064 draw_blame(struct tog_view *view, struct got_object_id *id, FILE *f,
2065     const char *path, struct tog_blame_line *lines, int nlines,
2066     int blame_complete, int selected_line, int *first_displayed_line,
2067     int *last_displayed_line, int *eof, int max_lines)
2068 {
2069 	const struct got_error *err;
2070 	int lineno = 0, nprinted = 0;
2071 	char *line;
2072 	size_t len;
2073 	wchar_t *wline;
2074 	int width, wlimit;
2075 	struct tog_blame_line *blame_line;
2076 	struct got_object_id *prev_id = NULL;
2077 	char *id_str;
2078 
2079 	err = got_object_id_str(&id_str, id);
2080 	if (err)
2081 		return err;
2082 
2083 	rewind(f);
2084 	werase(view->window);
2085 
2086 	if (asprintf(&line, "commit: %s", id_str) == -1) {
2087 		err = got_error_from_errno();
2088 		free(id_str);
2089 		return err;
2090 	}
2091 
2092 	err = format_line(&wline, &width, line, view->ncols);
2093 	free(line);
2094 	line = NULL;
2095 	if (view_needs_focus_indication(view))
2096 		wstandout(view->window);
2097 	waddwstr(view->window, wline);
2098 	if (view_needs_focus_indication(view))
2099 		wstandend(view->window);
2100 	free(wline);
2101 	wline = NULL;
2102 	if (width < view->ncols)
2103 		waddch(view->window, '\n');
2104 
2105 	if (asprintf(&line, "[%d/%d] %s%s",
2106 	    *first_displayed_line - 1 + selected_line, nlines,
2107 	    blame_complete ? "" : "annotating ", path) == -1) {
2108 		free(id_str);
2109 		return got_error_from_errno();
2110 	}
2111 	free(id_str);
2112 	err = format_line(&wline, &width, line, view->ncols);
2113 	free(line);
2114 	line = NULL;
2115 	if (err)
2116 		return err;
2117 	waddwstr(view->window, wline);
2118 	free(wline);
2119 	wline = NULL;
2120 	if (width < view->ncols)
2121 		waddch(view->window, '\n');
2122 
2123 	*eof = 0;
2124 	while (nprinted < max_lines - 2) {
2125 		line = parse_next_line(f, &len);
2126 		if (line == NULL) {
2127 			*eof = 1;
2128 			break;
2129 		}
2130 		if (++lineno < *first_displayed_line) {
2131 			free(line);
2132 			continue;
2133 		}
2134 
2135 		wlimit = view->ncols < 9 ? 0 : view->ncols - 9;
2136 		err = format_line(&wline, &width, line, wlimit);
2137 		if (err) {
2138 			free(line);
2139 			return err;
2140 		}
2141 
2142 		if (view->focussed && nprinted == selected_line - 1)
2143 			wstandout(view->window);
2144 
2145 		blame_line = &lines[lineno - 1];
2146 		if (blame_line->annotated && prev_id &&
2147 		    got_object_id_cmp(prev_id, blame_line->id) == 0)
2148 			waddstr(view->window, "         ");
2149 		else if (blame_line->annotated) {
2150 			char *id_str;
2151 			err = got_object_id_str(&id_str, blame_line->id);
2152 			if (err) {
2153 				free(line);
2154 				free(wline);
2155 				return err;
2156 			}
2157 			wprintw(view->window, "%.8s ", id_str);
2158 			free(id_str);
2159 			prev_id = blame_line->id;
2160 		} else {
2161 			waddstr(view->window, "........ ");
2162 			prev_id = NULL;
2163 		}
2164 
2165 		waddwstr(view->window, wline);
2166 		while (width < wlimit) {
2167 			waddch(view->window, ' ');
2168 			width++;
2169 		}
2170 		if (view->focussed && nprinted == selected_line - 1)
2171 			wstandend(view->window);
2172 		if (++nprinted == 1)
2173 			*first_displayed_line = lineno;
2174 		free(line);
2175 		free(wline);
2176 		wline = NULL;
2177 	}
2178 	*last_displayed_line = lineno;
2179 
2180 	view_vborder(view);
2181 
2182 	return NULL;
2183 }
2184 
2185 static const struct got_error *
2186 blame_cb(void *arg, int nlines, int lineno, struct got_object_id *id)
2187 {
2188 	const struct got_error *err = NULL;
2189 	struct tog_blame_cb_args *a = arg;
2190 	struct tog_blame_line *line;
2191 	int errcode;
2192 
2193 	if (nlines != a->nlines ||
2194 	    (lineno != -1 && lineno < 1) || lineno > a->nlines)
2195 		return got_error(GOT_ERR_RANGE);
2196 
2197 	errcode = pthread_mutex_lock(&tog_mutex);
2198 	if (errcode)
2199 		return got_error_set_errno(errcode);
2200 
2201 	if (*a->quit) {	/* user has quit the blame view */
2202 		err = got_error(GOT_ERR_ITER_COMPLETED);
2203 		goto done;
2204 	}
2205 
2206 	if (lineno == -1)
2207 		goto done; /* no change in this commit */
2208 
2209 	line = &a->lines[lineno - 1];
2210 	if (line->annotated)
2211 		goto done;
2212 
2213 	line->id = got_object_id_dup(id);
2214 	if (line->id == NULL) {
2215 		err = got_error_from_errno();
2216 		goto done;
2217 	}
2218 	line->annotated = 1;
2219 
2220 	err = draw_blame(a->view, a->commit_id, a->f, a->path,
2221 	    a->lines, a->nlines, 0, *a->selected_line, a->first_displayed_line,
2222 	    a->last_displayed_line, a->eof, a->view->nlines);
2223 #if 0 /* XXX ncurses isn't thread-safe */
2224 	if (!err) {
2225 		update_panels();
2226 		doupdate();
2227 	}
2228 #endif
2229 done:
2230 	errcode = pthread_mutex_unlock(&tog_mutex);
2231 	if (errcode)
2232 		err = got_error_set_errno(errcode);
2233 	return err;
2234 }
2235 
2236 static void *
2237 blame_thread(void *arg)
2238 {
2239 	const struct got_error *err;
2240 	struct tog_blame_thread_args *ta = arg;
2241 	struct tog_blame_cb_args *a = ta->cb_args;
2242 	int errcode;
2243 
2244 	err = got_blame_incremental(ta->path, a->commit_id, ta->repo,
2245 	    blame_cb, ta->cb_args);
2246 
2247 	errcode = pthread_mutex_lock(&tog_mutex);
2248 	if (errcode)
2249 		return (void *)got_error_set_errno(errcode);
2250 
2251 	got_repo_close(ta->repo);
2252 	ta->repo = NULL;
2253 	*ta->complete = 1;
2254 	if (!err) {
2255 		err = draw_blame(a->view, a->commit_id, a->f, a->path,
2256 		    a->lines, a->nlines, 1, *a->selected_line,
2257 		    a->first_displayed_line, a->last_displayed_line, a->eof,
2258 		    a->view->nlines);
2259 #if 0 /* XXX ncurses isn't thread-safe */
2260 		if (!err) {
2261 			update_panels();
2262 			doupdate();
2263 		}
2264 #endif
2265 	}
2266 
2267 	errcode = pthread_mutex_unlock(&tog_mutex);
2268 	if (errcode && err == NULL)
2269 		err = got_error_set_errno(errcode);
2270 
2271 	return (void *)err;
2272 }
2273 
2274 static struct got_object_id *
2275 get_selected_commit_id(struct tog_blame_line *lines,
2276     int first_displayed_line, int selected_line)
2277 {
2278 	struct tog_blame_line *line;
2279 
2280 	line = &lines[first_displayed_line - 1 + selected_line - 1];
2281 	if (!line->annotated)
2282 		return NULL;
2283 
2284 	return line->id;
2285 }
2286 
2287 static const struct got_error *
2288 open_selected_commit(struct got_object **pobj, struct got_object **obj,
2289     struct tog_blame_line *lines, int first_displayed_line,
2290     int selected_line, struct got_repository *repo)
2291 {
2292 	const struct got_error *err = NULL;
2293 	struct got_commit_object *commit = NULL;
2294 	struct got_object_id *selected_id;
2295 	struct got_object_qid *pid;
2296 
2297 	*pobj = NULL;
2298 	*obj = NULL;
2299 
2300 	selected_id = get_selected_commit_id(lines,
2301 	    first_displayed_line, selected_line);
2302 	if (selected_id == NULL)
2303 		return NULL;
2304 
2305 	err = got_object_open(obj, repo, selected_id);
2306 	if (err)
2307 		goto done;
2308 
2309 	err = got_object_commit_open(&commit, repo, *obj);
2310 	if (err)
2311 		goto done;
2312 
2313 	pid = SIMPLEQ_FIRST(&commit->parent_ids);
2314 	if (pid) {
2315 		err = got_object_open(pobj, repo, pid->id);
2316 		if (err)
2317 			goto done;
2318 	}
2319 done:
2320 	if (commit)
2321 		got_object_commit_close(commit);
2322 	return err;
2323 }
2324 
2325 static const struct got_error *
2326 stop_blame(struct tog_blame *blame)
2327 {
2328 	const struct got_error *err = NULL;
2329 	int i;
2330 
2331 	if (blame->thread) {
2332 		int errcode;
2333 		errcode = pthread_mutex_unlock(&tog_mutex);
2334 		if (errcode)
2335 			return got_error_set_errno(errcode);
2336 		errcode = pthread_join(blame->thread, (void **)&err);
2337 		if (errcode)
2338 			return got_error_set_errno(errcode);
2339 		errcode = pthread_mutex_lock(&tog_mutex);
2340 		if (errcode)
2341 			return got_error_set_errno(errcode);
2342 		if (err && err->code == GOT_ERR_ITER_COMPLETED)
2343 			err = NULL;
2344 		blame->thread = NULL;
2345 	}
2346 	if (blame->thread_args.repo) {
2347 		got_repo_close(blame->thread_args.repo);
2348 		blame->thread_args.repo = NULL;
2349 	}
2350 	if (blame->f) {
2351 		fclose(blame->f);
2352 		blame->f = NULL;
2353 	}
2354 	for (i = 0; i < blame->nlines; i++)
2355 		free(blame->lines[i].id);
2356 	free(blame->lines);
2357 	blame->lines = NULL;
2358 	free(blame->cb_args.commit_id);
2359 	blame->cb_args.commit_id = NULL;
2360 
2361 	return err;
2362 }
2363 
2364 static const struct got_error *
2365 run_blame(struct tog_blame *blame, struct tog_view *view, int *blame_complete,
2366     int *first_displayed_line, int *last_displayed_line, int *selected_line,
2367     int *done, int *eof, const char *path, struct got_object_id *commit_id,
2368     struct got_repository *repo)
2369 {
2370 	const struct got_error *err = NULL;
2371 	struct got_blob_object *blob = NULL;
2372 	struct got_repository *thread_repo = NULL;
2373 	struct got_object_id *obj_id = NULL;
2374 	struct got_object *obj = NULL;
2375 	int errcode;
2376 
2377 	err = got_object_id_by_path(&obj_id, repo, commit_id, path);
2378 	if (err)
2379 		goto done;
2380 
2381 	err = got_object_open(&obj, repo, obj_id);
2382 	if (err)
2383 		goto done;
2384 
2385 	if (got_object_get_type(obj) != GOT_OBJ_TYPE_BLOB) {
2386 		err = got_error(GOT_ERR_OBJ_TYPE);
2387 		goto done;
2388 	}
2389 
2390 	err = got_object_blob_open(&blob, repo, obj, 8192);
2391 	if (err)
2392 		goto done;
2393 	blame->f = got_opentemp();
2394 	if (blame->f == NULL) {
2395 		err = got_error_from_errno();
2396 		goto done;
2397 	}
2398 	err = got_object_blob_dump_to_file(&blame->filesize, &blame->nlines,
2399 	    blame->f, blob);
2400 	if (err)
2401 		goto done;
2402 
2403 	blame->lines = calloc(blame->nlines, sizeof(*blame->lines));
2404 	if (blame->lines == NULL) {
2405 		err = got_error_from_errno();
2406 		goto done;
2407 	}
2408 
2409 	err = got_repo_open(&thread_repo, got_repo_get_path(repo));
2410 	if (err)
2411 		goto done;
2412 
2413 	blame->cb_args.view = view;
2414 	blame->cb_args.lines = blame->lines;
2415 	blame->cb_args.nlines = blame->nlines;
2416 	blame->cb_args.commit_id = got_object_id_dup(commit_id);
2417 	if (blame->cb_args.commit_id == NULL) {
2418 		err = got_error_from_errno();
2419 		goto done;
2420 	}
2421 	blame->cb_args.f = blame->f;
2422 	blame->cb_args.path = path;
2423 	blame->cb_args.first_displayed_line = first_displayed_line;
2424 	blame->cb_args.selected_line = selected_line;
2425 	blame->cb_args.last_displayed_line = last_displayed_line;
2426 	blame->cb_args.quit = done;
2427 	blame->cb_args.eof = eof;
2428 
2429 	blame->thread_args.path = path;
2430 	blame->thread_args.repo = thread_repo;
2431 	blame->thread_args.cb_args = &blame->cb_args;
2432 	blame->thread_args.complete = blame_complete;
2433 	*blame_complete = 0;
2434 
2435 	errcode = pthread_create(&blame->thread, NULL, blame_thread,
2436 	    &blame->thread_args);
2437 	if (errcode) {
2438 		err = got_error_set_errno(errcode);
2439 		goto done;
2440 	}
2441 
2442 done:
2443 	if (blob)
2444 		got_object_blob_close(blob);
2445 	free(obj_id);
2446 	if (obj)
2447 		got_object_close(obj);
2448 	if (err)
2449 		stop_blame(blame);
2450 	return err;
2451 }
2452 
2453 static const struct got_error *
2454 open_blame_view(struct tog_view *view, char *path,
2455     struct got_object_id *commit_id, struct got_repository *repo)
2456 {
2457 	const struct got_error *err = NULL;
2458 	struct tog_blame_view_state *s = &view->state.blame;
2459 
2460 	SIMPLEQ_INIT(&s->blamed_commits);
2461 
2462 	err = got_object_qid_alloc(&s->blamed_commit, commit_id);
2463 	if (err)
2464 		return err;
2465 
2466 	SIMPLEQ_INSERT_HEAD(&s->blamed_commits, s->blamed_commit, entry);
2467 	s->first_displayed_line = 1;
2468 	s->last_displayed_line = view->nlines;
2469 	s->selected_line = 1;
2470 	s->blame_complete = 0;
2471 	s->path = path;
2472 	if (s->path == NULL)
2473 		return got_error_from_errno();
2474 	s->repo = repo;
2475 	s->commit_id = commit_id;
2476 	memset(&s->blame, 0, sizeof(s->blame));
2477 
2478 	view->show = show_blame_view;
2479 	view->input = input_blame_view;
2480 	view->close = close_blame_view;
2481 
2482 	return run_blame(&s->blame, view, &s->blame_complete,
2483 	    &s->first_displayed_line, &s->last_displayed_line,
2484 	    &s->selected_line, &s->done, &s->eof, s->path,
2485 	    s->blamed_commit->id, s->repo);
2486 }
2487 
2488 static const struct got_error *
2489 close_blame_view(struct tog_view *view)
2490 {
2491 	const struct got_error *err = NULL;
2492 	struct tog_blame_view_state *s = &view->state.blame;
2493 
2494 	if (s->blame.thread)
2495 		err = stop_blame(&s->blame);
2496 
2497 	while (!SIMPLEQ_EMPTY(&s->blamed_commits)) {
2498 		struct got_object_qid *blamed_commit;
2499 		blamed_commit = SIMPLEQ_FIRST(&s->blamed_commits);
2500 		SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2501 		got_object_qid_free(blamed_commit);
2502 	}
2503 
2504 	free(s->path);
2505 
2506 	return err;
2507 }
2508 
2509 static const struct got_error *
2510 show_blame_view(struct tog_view *view)
2511 {
2512 	const struct got_error *err = NULL;
2513 	struct tog_blame_view_state *s = &view->state.blame;
2514 
2515 	err = draw_blame(view, s->blamed_commit->id, s->blame.f,
2516 	    s->path, s->blame.lines, s->blame.nlines, s->blame_complete,
2517 	    s->selected_line, &s->first_displayed_line,
2518 	    &s->last_displayed_line, &s->eof, view->nlines);
2519 
2520 	view_vborder(view);
2521 	return err;
2522 }
2523 
2524 static const struct got_error *
2525 input_blame_view(struct tog_view **new_view, struct tog_view **dead_view,
2526     struct tog_view **focus_view, struct tog_view *view, int ch)
2527 {
2528 	const struct got_error *err = NULL, *thread_err = NULL;
2529 	struct got_object *obj = NULL, *pobj = NULL;
2530 	struct tog_view *diff_view;
2531 	struct tog_blame_view_state *s = &view->state.blame;
2532 	int begin_x = 0;
2533 
2534 	switch (ch) {
2535 		case 'q':
2536 			s->done = 1;
2537 			break;
2538 		case 'k':
2539 		case KEY_UP:
2540 			if (s->selected_line > 1)
2541 				s->selected_line--;
2542 			else if (s->selected_line == 1 &&
2543 			    s->first_displayed_line > 1)
2544 				s->first_displayed_line--;
2545 			break;
2546 		case KEY_PPAGE:
2547 			if (s->first_displayed_line == 1) {
2548 				s->selected_line = 1;
2549 				break;
2550 			}
2551 			if (s->first_displayed_line > view->nlines - 2)
2552 				s->first_displayed_line -=
2553 				    (view->nlines - 2);
2554 			else
2555 				s->first_displayed_line = 1;
2556 			break;
2557 		case 'j':
2558 		case KEY_DOWN:
2559 			if (s->selected_line < view->nlines - 2 &&
2560 			    s->first_displayed_line +
2561 			    s->selected_line <= s->blame.nlines)
2562 				s->selected_line++;
2563 			else if (s->last_displayed_line <
2564 			    s->blame.nlines)
2565 				s->first_displayed_line++;
2566 			break;
2567 		case 'b':
2568 		case 'p': {
2569 			struct got_object_id *id;
2570 			id = get_selected_commit_id(s->blame.lines,
2571 			    s->first_displayed_line, s->selected_line);
2572 			if (id == NULL || got_object_id_cmp(id,
2573 			    s->blamed_commit->id) == 0)
2574 				break;
2575 			err = open_selected_commit(&pobj, &obj,
2576 			    s->blame.lines, s->first_displayed_line,
2577 			    s->selected_line, s->repo);
2578 			if (err)
2579 				break;
2580 			if (pobj == NULL && obj == NULL)
2581 				break;
2582 			if (ch == 'p' && pobj == NULL)
2583 				break;
2584 			s->done = 1;
2585 			thread_err = stop_blame(&s->blame);
2586 			s->done = 0;
2587 			if (thread_err)
2588 				break;
2589 			id = got_object_get_id(ch == 'b' ? obj : pobj);
2590 			got_object_close(obj);
2591 			obj = NULL;
2592 			if (pobj) {
2593 				got_object_close(pobj);
2594 				pobj = NULL;
2595 			}
2596 			err = got_object_qid_alloc(&s->blamed_commit, id);
2597 			if (err)
2598 				goto done;
2599 			SIMPLEQ_INSERT_HEAD(&s->blamed_commits,
2600 			    s->blamed_commit, entry);
2601 			err = run_blame(&s->blame, view, &s->blame_complete,
2602 			    &s->first_displayed_line, &s->last_displayed_line,
2603 			    &s->selected_line, &s->done, &s->eof,
2604 			    s->path, s->blamed_commit->id, s->repo);
2605 			if (err)
2606 				break;
2607 			break;
2608 		}
2609 		case 'B': {
2610 			struct got_object_qid *first;
2611 			first = SIMPLEQ_FIRST(&s->blamed_commits);
2612 			if (!got_object_id_cmp(first->id, s->commit_id))
2613 				break;
2614 			s->done = 1;
2615 			thread_err = stop_blame(&s->blame);
2616 			s->done = 0;
2617 			if (thread_err)
2618 				break;
2619 			SIMPLEQ_REMOVE_HEAD(&s->blamed_commits, entry);
2620 			got_object_qid_free(s->blamed_commit);
2621 			s->blamed_commit =
2622 			    SIMPLEQ_FIRST(&s->blamed_commits);
2623 			err = run_blame(&s->blame, view, &s->blame_complete,
2624 			    &s->first_displayed_line, &s->last_displayed_line,
2625 			    &s->selected_line, &s->done, &s->eof, s->path,
2626 			    s->blamed_commit->id, s->repo);
2627 			if (err)
2628 				break;
2629 			break;
2630 		}
2631 		case KEY_ENTER:
2632 		case '\r':
2633 			err = open_selected_commit(&pobj, &obj,
2634 			    s->blame.lines, s->first_displayed_line,
2635 			    s->selected_line, s->repo);
2636 			if (err)
2637 				break;
2638 			if (pobj == NULL && obj == NULL)
2639 				break;
2640 
2641 			if (view_is_parent_view(view))
2642 			    begin_x = view_split_begin_x(view->begin_x);
2643 			diff_view = view_open(0, 0, 0, begin_x, TOG_VIEW_DIFF);
2644 			if (diff_view == NULL) {
2645 				err = got_error_from_errno();
2646 				break;
2647 			}
2648 			err = open_diff_view(diff_view, pobj, obj, s->repo);
2649 			if (err) {
2650 				view_close(diff_view);
2651 				break;
2652 			}
2653 			if (view_is_parent_view(view)) {
2654 				err = view_close_child(view);
2655 				if (err)
2656 					return err;
2657 				err = view_set_child(view, diff_view);
2658 				if (err) {
2659 					view_close(diff_view);
2660 					break;
2661 				}
2662 				if (!view_is_splitscreen(diff_view)) {
2663 					*focus_view = diff_view;
2664 					view->child_focussed = 1;
2665 				}
2666 			} else
2667 				*new_view = diff_view;
2668 			if (pobj) {
2669 				got_object_close(pobj);
2670 				pobj = NULL;
2671 			}
2672 			got_object_close(obj);
2673 			obj = NULL;
2674 			if (err)
2675 				break;
2676 			break;
2677 		case KEY_NPAGE:
2678 		case ' ':
2679 			if (s->last_displayed_line >= s->blame.nlines &&
2680 			    s->selected_line < view->nlines - 2) {
2681 				s->selected_line = MIN(s->blame.nlines,
2682 				    view->nlines - 2);
2683 				break;
2684 			}
2685 			if (s->last_displayed_line + view->nlines - 2
2686 			    <= s->blame.nlines)
2687 				s->first_displayed_line +=
2688 				    view->nlines - 2;
2689 			else
2690 				s->first_displayed_line =
2691 				    s->blame.nlines -
2692 				    (view->nlines - 3);
2693 			break;
2694 		case KEY_RESIZE:
2695 			if (s->selected_line > view->nlines - 2) {
2696 				s->selected_line = MIN(s->blame.nlines,
2697 				    view->nlines - 2);
2698 			}
2699 			break;
2700 		default:
2701 			break;
2702 	}
2703 done:
2704 	if (pobj)
2705 		got_object_close(pobj);
2706 	return thread_err ? thread_err : err;
2707 }
2708 
2709 static const struct got_error *
2710 cmd_blame(int argc, char *argv[])
2711 {
2712 	const struct got_error *error;
2713 	struct got_repository *repo = NULL;
2714 	char *path, *cwd = NULL, *repo_path = NULL, *in_repo_path = NULL;
2715 	struct got_object_id *commit_id = NULL;
2716 	char *commit_id_str = NULL;
2717 	int ch;
2718 	struct tog_view *view;
2719 
2720 #ifndef PROFILE
2721 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd", NULL)
2722 	    == -1)
2723 		err(1, "pledge");
2724 #endif
2725 
2726 	while ((ch = getopt(argc, argv, "c:r:")) != -1) {
2727 		switch (ch) {
2728 		case 'c':
2729 			commit_id_str = optarg;
2730 			break;
2731 		case 'r':
2732 			repo_path = realpath(optarg, NULL);
2733 			if (repo_path == NULL)
2734 				err(1, "-r option");
2735 			break;
2736 		default:
2737 			usage();
2738 			/* NOTREACHED */
2739 		}
2740 	}
2741 
2742 	argc -= optind;
2743 	argv += optind;
2744 
2745 	if (argc == 1)
2746 		path = argv[0];
2747 	else
2748 		usage_blame();
2749 
2750 	cwd = getcwd(NULL, 0);
2751 	if (cwd == NULL) {
2752 		error = got_error_from_errno();
2753 		goto done;
2754 	}
2755 	if (repo_path == NULL) {
2756 		repo_path = strdup(cwd);
2757 		if (repo_path == NULL) {
2758 			error = got_error_from_errno();
2759 			goto done;
2760 		}
2761 	}
2762 
2763 
2764 	error = got_repo_open(&repo, repo_path);
2765 	if (error != NULL)
2766 		return error;
2767 
2768 	error = got_repo_map_path(&in_repo_path, repo, path);
2769 	if (error != NULL)
2770 		goto done;
2771 
2772 	if (commit_id_str == NULL) {
2773 		struct got_reference *head_ref;
2774 		error = got_ref_open(&head_ref, repo, GOT_REF_HEAD);
2775 		if (error != NULL)
2776 			goto done;
2777 		error = got_ref_resolve(&commit_id, repo, head_ref);
2778 		got_ref_close(head_ref);
2779 	} else {
2780 		struct got_object *obj;
2781 		error = got_object_open_by_id_str(&obj, repo, commit_id_str);
2782 		if (error != NULL)
2783 			goto done;
2784 		commit_id = got_object_id_dup(got_object_get_id(obj));
2785 		if (commit_id == NULL)
2786 			error = got_error_from_errno();
2787 		got_object_close(obj);
2788 	}
2789 	if (error != NULL)
2790 		goto done;
2791 
2792 	view = view_open(0, 0, 0, 0, TOG_VIEW_BLAME);
2793 	if (view == NULL) {
2794 		error = got_error_from_errno();
2795 		goto done;
2796 	}
2797 	error = open_blame_view(view, in_repo_path, commit_id, repo);
2798 	if (error)
2799 		goto done;
2800 	error = view_loop(view);
2801 done:
2802 	free(repo_path);
2803 	free(cwd);
2804 	free(commit_id);
2805 	if (repo)
2806 		got_repo_close(repo);
2807 	return error;
2808 }
2809 
2810 static const struct got_error *
2811 draw_tree_entries(struct tog_view *view,
2812     struct got_tree_entry **first_displayed_entry,
2813     struct got_tree_entry **last_displayed_entry,
2814     struct got_tree_entry **selected_entry, int *ndisplayed,
2815     const char *label, int show_ids, const char *parent_path,
2816     const struct got_tree_entries *entries, int selected, int limit, int isroot)
2817 {
2818 	const struct got_error *err = NULL;
2819 	struct got_tree_entry *te;
2820 	wchar_t *wline;
2821 	int width, n;
2822 
2823 	*ndisplayed = 0;
2824 
2825 	werase(view->window);
2826 
2827 	if (limit == 0)
2828 		return NULL;
2829 
2830 	err = format_line(&wline, &width, label, view->ncols);
2831 	if (err)
2832 		return err;
2833 	if (view_needs_focus_indication(view))
2834 		wstandout(view->window);
2835 	waddwstr(view->window, wline);
2836 	if (view_needs_focus_indication(view))
2837 		wstandend(view->window);
2838 	free(wline);
2839 	wline = NULL;
2840 	if (width < view->ncols)
2841 		waddch(view->window, '\n');
2842 	if (--limit <= 0)
2843 		return NULL;
2844 	err = format_line(&wline, &width, parent_path, view->ncols);
2845 	if (err)
2846 		return err;
2847 	waddwstr(view->window, wline);
2848 	free(wline);
2849 	wline = NULL;
2850 	if (width < view->ncols)
2851 		waddch(view->window, '\n');
2852 	if (--limit <= 0)
2853 		return NULL;
2854 	waddch(view->window, '\n');
2855 	if (--limit <= 0)
2856 		return NULL;
2857 
2858 	te = SIMPLEQ_FIRST(&entries->head);
2859 	if (*first_displayed_entry == NULL) {
2860 		if (selected == 0) {
2861 			if (view->focussed)
2862 				wstandout(view->window);
2863 			*selected_entry = NULL;
2864 		}
2865 		waddstr(view->window, "  ..\n");	/* parent directory */
2866 		if (selected == 0 && view->focussed)
2867 			wstandend(view->window);
2868 		(*ndisplayed)++;
2869 		if (--limit <= 0)
2870 			return NULL;
2871 		n = 1;
2872 	} else {
2873 		n = 0;
2874 		while (te != *first_displayed_entry)
2875 			te = SIMPLEQ_NEXT(te, entry);
2876 	}
2877 
2878 	while (te) {
2879 		char *line = NULL, *id_str = NULL;
2880 
2881 		if (show_ids) {
2882 			err = got_object_id_str(&id_str, te->id);
2883 			if (err)
2884 				return got_error_from_errno();
2885 		}
2886 		if (asprintf(&line, "%s  %s%s", id_str ? id_str : "",
2887 		    te->name, S_ISDIR(te->mode) ? "/" : "") == -1) {
2888 			free(id_str);
2889 			return got_error_from_errno();
2890 		}
2891 		free(id_str);
2892 		err = format_line(&wline, &width, line, view->ncols);
2893 		if (err) {
2894 			free(line);
2895 			break;
2896 		}
2897 		if (n == selected) {
2898 			if (view->focussed)
2899 				wstandout(view->window);
2900 			*selected_entry = te;
2901 		}
2902 		waddwstr(view->window, wline);
2903 		if (width < view->ncols)
2904 			waddch(view->window, '\n');
2905 		if (n == selected && view->focussed)
2906 			wstandend(view->window);
2907 		free(line);
2908 		free(wline);
2909 		wline = NULL;
2910 		n++;
2911 		(*ndisplayed)++;
2912 		*last_displayed_entry = te;
2913 		if (--limit <= 0)
2914 			break;
2915 		te = SIMPLEQ_NEXT(te, entry);
2916 	}
2917 
2918 	return err;
2919 }
2920 
2921 static void
2922 tree_scroll_up(struct got_tree_entry **first_displayed_entry, int maxscroll,
2923     const struct got_tree_entries *entries, int isroot)
2924 {
2925 	struct got_tree_entry *te, *prev;
2926 	int i;
2927 
2928 	if (*first_displayed_entry == NULL)
2929 		return;
2930 
2931 	te = SIMPLEQ_FIRST(&entries->head);
2932 	if (*first_displayed_entry == te) {
2933 		if (!isroot)
2934 			*first_displayed_entry = NULL;
2935 		return;
2936 	}
2937 
2938 	/* XXX this is stupid... switch to TAILQ? */
2939 	for (i = 0; i < maxscroll; i++) {
2940 		while (te != *first_displayed_entry) {
2941 			prev = te;
2942 			te = SIMPLEQ_NEXT(te, entry);
2943 		}
2944 		*first_displayed_entry = prev;
2945 		te = SIMPLEQ_FIRST(&entries->head);
2946 	}
2947 	if (!isroot && te == SIMPLEQ_FIRST(&entries->head) && i < maxscroll)
2948 		*first_displayed_entry = NULL;
2949 }
2950 
2951 static void
2952 tree_scroll_down(struct got_tree_entry **first_displayed_entry, int maxscroll,
2953 	struct got_tree_entry *last_displayed_entry,
2954 	const struct got_tree_entries *entries)
2955 {
2956 	struct got_tree_entry *next;
2957 	int n = 0;
2958 
2959 	if (SIMPLEQ_NEXT(last_displayed_entry, entry) == NULL)
2960 		return;
2961 
2962 	if (*first_displayed_entry)
2963 		next = SIMPLEQ_NEXT(*first_displayed_entry, entry);
2964 	else
2965 		next = SIMPLEQ_FIRST(&entries->head);
2966 	while (next) {
2967 		*first_displayed_entry = next;
2968 		if (++n >= maxscroll)
2969 			break;
2970 		next = SIMPLEQ_NEXT(next, entry);
2971 	}
2972 }
2973 
2974 static const struct got_error *
2975 tree_entry_path(char **path, struct tog_parent_trees *parents,
2976     struct got_tree_entry *te)
2977 {
2978 	const struct got_error *err = NULL;
2979 	struct tog_parent_tree *pt;
2980 	size_t len = 2; /* for leading slash and NUL */
2981 
2982 	TAILQ_FOREACH(pt, parents, entry)
2983 		len += strlen(pt->selected_entry->name) + 1 /* slash */;
2984 	if (te)
2985 		len += strlen(te->name);
2986 
2987 	*path = calloc(1, len);
2988 	if (path == NULL)
2989 		return got_error_from_errno();
2990 
2991 	(*path)[0] = '/';
2992 	pt = TAILQ_LAST(parents, tog_parent_trees);
2993 	while (pt) {
2994 		if (strlcat(*path, pt->selected_entry->name, len) >= len) {
2995 			err = got_error(GOT_ERR_NO_SPACE);
2996 			goto done;
2997 		}
2998 		if (strlcat(*path, "/", len) >= len) {
2999 			err = got_error(GOT_ERR_NO_SPACE);
3000 			goto done;
3001 		}
3002 		pt = TAILQ_PREV(pt, tog_parent_trees, entry);
3003 	}
3004 	if (te) {
3005 		if (strlcat(*path, te->name, len) >= len) {
3006 			err = got_error(GOT_ERR_NO_SPACE);
3007 			goto done;
3008 		}
3009 	}
3010 done:
3011 	if (err) {
3012 		free(*path);
3013 		*path = NULL;
3014 	}
3015 	return err;
3016 }
3017 
3018 static const struct got_error *
3019 blame_tree_entry(struct tog_view **new_view, int begin_x,
3020     struct got_tree_entry *te, struct tog_parent_trees *parents,
3021     struct got_object_id *commit_id, struct got_repository *repo)
3022 {
3023 	const struct got_error *err = NULL;
3024 	char *path;
3025 	struct tog_view *blame_view;
3026 
3027 	err = tree_entry_path(&path, parents, te);
3028 	if (err)
3029 		return err;
3030 
3031 	blame_view = view_open(0, 0, 0, begin_x, TOG_VIEW_BLAME);
3032 	if (blame_view == NULL)
3033 		return got_error_from_errno();
3034 
3035 	err = open_blame_view(blame_view, path, commit_id, repo);
3036 	if (err) {
3037 		view_close(blame_view);
3038 		free(path);
3039 	} else
3040 		*new_view = blame_view;
3041 	return err;
3042 }
3043 
3044 static const struct got_error *
3045 log_tree_entry(struct tog_view **new_view, int begin_x,
3046     struct got_tree_entry *te, struct tog_parent_trees *parents,
3047     struct got_object_id *commit_id, struct got_repository *repo)
3048 {
3049 	struct tog_view *log_view;
3050 	const struct got_error *err = NULL;
3051 	char *path;
3052 
3053 	log_view = view_open(0, 0, 0, begin_x, TOG_VIEW_LOG);
3054 	if (log_view == NULL)
3055 		return got_error_from_errno();
3056 
3057 	err = tree_entry_path(&path, parents, te);
3058 	if (err)
3059 		return err;
3060 
3061 	err = open_log_view(log_view, commit_id, repo, path);
3062 	if (err)
3063 		view_close(log_view);
3064 	else
3065 		*new_view = log_view;
3066 	free(path);
3067 	return err;
3068 }
3069 
3070 static const struct got_error *
3071 open_tree_view(struct tog_view *view, struct got_tree_object *root,
3072     struct got_object_id *commit_id, struct got_repository *repo)
3073 {
3074 	const struct got_error *err = NULL;
3075 	char *commit_id_str = NULL;
3076 	struct tog_tree_view_state *s = &view->state.tree;
3077 
3078 	TAILQ_INIT(&s->parents);
3079 
3080 	err = got_object_id_str(&commit_id_str, commit_id);
3081 	if (err != NULL)
3082 		goto done;
3083 
3084 	if (asprintf(&s->tree_label, "commit: %s", commit_id_str) == -1) {
3085 		err = got_error_from_errno();
3086 		goto done;
3087 	}
3088 
3089 	s->root = s->tree = root;
3090 	s->entries = got_object_tree_get_entries(root);
3091 	s->first_displayed_entry = SIMPLEQ_FIRST(&s->entries->head);
3092 	s->commit_id = got_object_id_dup(commit_id);
3093 	if (s->commit_id == NULL) {
3094 		err = got_error_from_errno();
3095 		goto done;
3096 	}
3097 	s->repo = repo;
3098 
3099 	view->show = show_tree_view;
3100 	view->input = input_tree_view;
3101 	view->close = close_tree_view;
3102 done:
3103 	free(commit_id_str);
3104 	if (err) {
3105 		free(s->tree_label);
3106 		s->tree_label = NULL;
3107 	}
3108 	return err;
3109 }
3110 
3111 static const struct got_error *
3112 close_tree_view(struct tog_view *view)
3113 {
3114 	struct tog_tree_view_state *s = &view->state.tree;
3115 
3116 	free(s->tree_label);
3117 	s->tree_label = NULL;
3118 	free(s->commit_id);
3119 	s->commit_id = NULL;
3120 	while (!TAILQ_EMPTY(&s->parents)) {
3121 		struct tog_parent_tree *parent;
3122 		parent = TAILQ_FIRST(&s->parents);
3123 		TAILQ_REMOVE(&s->parents, parent, entry);
3124 		free(parent);
3125 
3126 	}
3127 	if (s->tree != s->root)
3128 		got_object_tree_close(s->tree);
3129 	got_object_tree_close(s->root);
3130 
3131 	return NULL;
3132 }
3133 
3134 static const struct got_error *
3135 show_tree_view(struct tog_view *view)
3136 {
3137 	const struct got_error *err = NULL;
3138 	struct tog_tree_view_state *s = &view->state.tree;
3139 	char *parent_path;
3140 
3141 	err = tree_entry_path(&parent_path, &s->parents, NULL);
3142 	if (err)
3143 		return err;
3144 
3145 	err = draw_tree_entries(view, &s->first_displayed_entry,
3146 	    &s->last_displayed_entry, &s->selected_entry,
3147 	    &s->ndisplayed, s->tree_label, s->show_ids, parent_path,
3148 	    s->entries, s->selected, view->nlines, s->tree == s->root);
3149 	free(parent_path);
3150 
3151 	view_vborder(view);
3152 	return err;
3153 }
3154 
3155 static const struct got_error *
3156 input_tree_view(struct tog_view **new_view, struct tog_view **dead_view,
3157     struct tog_view **focus_view, struct tog_view *view, int ch)
3158 {
3159 	const struct got_error *err = NULL;
3160 	struct tog_tree_view_state *s = &view->state.tree;
3161 	struct tog_view *log_view;
3162 	int begin_x = 0;
3163 
3164 	switch (ch) {
3165 		case 'i':
3166 			s->show_ids = !s->show_ids;
3167 			break;
3168 		case 'l':
3169 			if (!s->selected_entry)
3170 				break;
3171 			if (view_is_parent_view(view))
3172 				begin_x = view_split_begin_x(view->begin_x);
3173 			err = log_tree_entry(&log_view, begin_x,
3174 			    s->selected_entry, &s->parents,
3175 			    s->commit_id, s->repo);
3176 			if (view_is_parent_view(view)) {
3177 				err = view_close_child(view);
3178 				if (err)
3179 					return err;
3180 				err = view_set_child(view, log_view);
3181 				if (err) {
3182 					view_close(log_view);
3183 					break;
3184 				}
3185 				*focus_view = log_view;
3186 				view->child_focussed = 1;
3187 			} else
3188 				*new_view = log_view;
3189 			break;
3190 		case 'k':
3191 		case KEY_UP:
3192 			if (s->selected > 0)
3193 				s->selected--;
3194 			if (s->selected > 0)
3195 				break;
3196 			tree_scroll_up(&s->first_displayed_entry, 1,
3197 			    s->entries, s->tree == s->root);
3198 			break;
3199 		case KEY_PPAGE:
3200 			if (SIMPLEQ_FIRST(&s->entries->head) ==
3201 			    s->first_displayed_entry) {
3202 				if (s->tree != s->root)
3203 					s->first_displayed_entry = NULL;
3204 				s->selected = 0;
3205 				break;
3206 			}
3207 			tree_scroll_up(&s->first_displayed_entry,
3208 			    view->nlines, s->entries,
3209 			    s->tree == s->root);
3210 			break;
3211 		case 'j':
3212 		case KEY_DOWN:
3213 			if (s->selected < s->ndisplayed - 1) {
3214 				s->selected++;
3215 				break;
3216 			}
3217 			tree_scroll_down(&s->first_displayed_entry, 1,
3218 			    s->last_displayed_entry, s->entries);
3219 			break;
3220 		case KEY_NPAGE:
3221 			tree_scroll_down(&s->first_displayed_entry,
3222 			    view->nlines, s->last_displayed_entry,
3223 			    s->entries);
3224 			if (SIMPLEQ_NEXT(s->last_displayed_entry,
3225 			    entry))
3226 				break;
3227 			/* can't scroll any further; move cursor down */
3228 			if (s->selected < s->ndisplayed - 1)
3229 				s->selected = s->ndisplayed - 1;
3230 			break;
3231 		case KEY_ENTER:
3232 		case '\r':
3233 			if (s->selected_entry == NULL) {
3234 				struct tog_parent_tree *parent;
3235 		case KEY_BACKSPACE:
3236 				/* user selected '..' */
3237 				if (s->tree == s->root)
3238 					break;
3239 				parent = TAILQ_FIRST(&s->parents);
3240 				TAILQ_REMOVE(&s->parents, parent,
3241 				    entry);
3242 				got_object_tree_close(s->tree);
3243 				s->tree = parent->tree;
3244 				s->entries =
3245 				    got_object_tree_get_entries(s->tree);
3246 				s->first_displayed_entry =
3247 				    parent->first_displayed_entry;
3248 				s->selected_entry =
3249 				    parent->selected_entry;
3250 				s->selected = parent->selected;
3251 				free(parent);
3252 			} else if (S_ISDIR(s->selected_entry->mode)) {
3253 				struct tog_parent_tree *parent;
3254 				struct got_tree_object *child;
3255 				err = got_object_open_as_tree(&child,
3256 				    s->repo, s->selected_entry->id);
3257 				if (err)
3258 					break;
3259 				parent = calloc(1, sizeof(*parent));
3260 				if (parent == NULL) {
3261 					err = got_error_from_errno();
3262 					break;
3263 				}
3264 				parent->tree = s->tree;
3265 				parent->first_displayed_entry =
3266 				   s->first_displayed_entry;
3267 				parent->selected_entry = s->selected_entry;
3268 				parent->selected = s->selected;
3269 				TAILQ_INSERT_HEAD(&s->parents, parent, entry);
3270 				s->tree = child;
3271 				s->entries =
3272 				    got_object_tree_get_entries(s->tree);
3273 				s->selected = 0;
3274 				s->first_displayed_entry = NULL;
3275 			} else if (S_ISREG(s->selected_entry->mode)) {
3276 				struct tog_view *blame_view;
3277 				int begin_x = view_is_parent_view(view) ?
3278 				    view_split_begin_x(view->begin_x) : 0;
3279 
3280 				err = blame_tree_entry(&blame_view, begin_x,
3281 				    s->selected_entry, &s->parents, s->commit_id,
3282 				    s->repo);
3283 				if (err)
3284 					break;
3285 				if (view_is_parent_view(view)) {
3286 					err = view_close_child(view);
3287 					if (err)
3288 						return err;
3289 					err = view_set_child(view, blame_view);
3290 					if (err) {
3291 						view_close(blame_view);
3292 						break;
3293 					}
3294 					*focus_view = blame_view;
3295 					view->child_focussed = 1;
3296 				} else
3297 					*new_view = blame_view;
3298 			}
3299 			break;
3300 		case KEY_RESIZE:
3301 			if (s->selected > view->nlines)
3302 				s->selected = s->ndisplayed - 1;
3303 			break;
3304 		default:
3305 			break;
3306 	}
3307 
3308 	return err;
3309 }
3310 
3311 __dead static void
3312 usage_tree(void)
3313 {
3314 	endwin();
3315 	fprintf(stderr, "usage: %s tree [-c commit] [repository-path]\n",
3316 	    getprogname());
3317 	exit(1);
3318 }
3319 
3320 static const struct got_error *
3321 cmd_tree(int argc, char *argv[])
3322 {
3323 	const struct got_error *error;
3324 	struct got_repository *repo = NULL;
3325 	char *repo_path = NULL;
3326 	struct got_object_id *commit_id = NULL;
3327 	char *commit_id_arg = NULL;
3328 	struct got_commit_object *commit = NULL;
3329 	struct got_tree_object *tree = NULL;
3330 	int ch;
3331 	struct tog_view *view;
3332 
3333 #ifndef PROFILE
3334 	if (pledge("stdio rpath wpath cpath flock proc tty exec sendfd", NULL)
3335 	    == -1)
3336 		err(1, "pledge");
3337 #endif
3338 
3339 	while ((ch = getopt(argc, argv, "c:")) != -1) {
3340 		switch (ch) {
3341 		case 'c':
3342 			commit_id_arg = optarg;
3343 			break;
3344 		default:
3345 			usage();
3346 			/* NOTREACHED */
3347 		}
3348 	}
3349 
3350 	argc -= optind;
3351 	argv += optind;
3352 
3353 	if (argc == 0) {
3354 		repo_path = getcwd(NULL, 0);
3355 		if (repo_path == NULL)
3356 			return got_error_from_errno();
3357 	} else if (argc == 1) {
3358 		repo_path = realpath(argv[0], NULL);
3359 		if (repo_path == NULL)
3360 			return got_error_from_errno();
3361 	} else
3362 		usage_log();
3363 
3364 	error = got_repo_open(&repo, repo_path);
3365 	free(repo_path);
3366 	if (error != NULL)
3367 		return error;
3368 
3369 	if (commit_id_arg == NULL) {
3370 		error = get_head_commit_id(&commit_id, repo);
3371 		if (error != NULL)
3372 			goto done;
3373 	} else {
3374 		struct got_object *obj;
3375 		error = got_object_open_by_id_str(&obj, repo, commit_id_arg);
3376 		if (error == NULL) {
3377 			commit_id = got_object_id_dup(got_object_get_id(obj));
3378 			if (commit_id == NULL)
3379 				error = got_error_from_errno();
3380 		}
3381 	}
3382 	if (error != NULL)
3383 		goto done;
3384 
3385 	error = got_object_open_as_commit(&commit, repo, commit_id);
3386 	if (error != NULL)
3387 		goto done;
3388 
3389 	error = got_object_open_as_tree(&tree, repo, commit->tree_id);
3390 	if (error != NULL)
3391 		goto done;
3392 
3393 	view = view_open(0, 0, 0, 0, TOG_VIEW_TREE);
3394 	if (view == NULL) {
3395 		error = got_error_from_errno();
3396 		goto done;
3397 	}
3398 	error = open_tree_view(view, tree, commit_id, repo);
3399 	if (error)
3400 		goto done;
3401 	error = view_loop(view);
3402 done:
3403 	free(commit_id);
3404 	if (commit)
3405 		got_object_commit_close(commit);
3406 	if (tree)
3407 		got_object_tree_close(tree);
3408 	if (repo)
3409 		got_repo_close(repo);
3410 	return error;
3411 }
3412 static void
3413 init_curses(void)
3414 {
3415 	initscr();
3416 	cbreak();
3417 	halfdelay(10);
3418 	noecho();
3419 	nonl();
3420 	intrflush(stdscr, FALSE);
3421 	keypad(stdscr, TRUE);
3422 	curs_set(0);
3423 }
3424 
3425 __dead static void
3426 usage(void)
3427 {
3428 	int i;
3429 
3430 	fprintf(stderr, "usage: %s [-h] [command] [arg ...]\n\n"
3431 	    "Available commands:\n", getprogname());
3432 	for (i = 0; i < nitems(tog_commands); i++) {
3433 		struct tog_cmd *cmd = &tog_commands[i];
3434 		fprintf(stderr, "    %s: %s\n", cmd->name, cmd->descr);
3435 	}
3436 	exit(1);
3437 }
3438 
3439 static char **
3440 make_argv(const char *arg0, const char *arg1)
3441 {
3442 	char **argv;
3443 	int argc = (arg1 == NULL ? 1 : 2);
3444 
3445 	argv = calloc(argc, sizeof(char *));
3446 	if (argv == NULL)
3447 		err(1, "calloc");
3448 	argv[0] = strdup(arg0);
3449 	if (argv[0] == NULL)
3450 		err(1, "calloc");
3451 	if (arg1) {
3452 		argv[1] = strdup(arg1);
3453 		if (argv[1] == NULL)
3454 			err(1, "calloc");
3455 	}
3456 
3457 	return argv;
3458 }
3459 
3460 int
3461 main(int argc, char *argv[])
3462 {
3463 	const struct got_error *error = NULL;
3464 	struct tog_cmd *cmd = NULL;
3465 	int ch, hflag = 0;
3466 	char **cmd_argv = NULL;
3467 
3468 	setlocale(LC_ALL, "");
3469 
3470 	while ((ch = getopt(argc, argv, "h")) != -1) {
3471 		switch (ch) {
3472 		case 'h':
3473 			hflag = 1;
3474 			break;
3475 		default:
3476 			usage();
3477 			/* NOTREACHED */
3478 		}
3479 	}
3480 
3481 	argc -= optind;
3482 	argv += optind;
3483 	optind = 0;
3484 	optreset = 1;
3485 
3486 	if (argc == 0) {
3487 		if (hflag)
3488 			usage();
3489 		/* Build an argument vector which runs a default command. */
3490 		cmd = &tog_commands[0];
3491 		cmd_argv = make_argv(cmd->name, NULL);
3492 		argc = 1;
3493 	} else {
3494 		int i;
3495 
3496 		/* Did the user specific a command? */
3497 		for (i = 0; i < nitems(tog_commands); i++) {
3498 			if (strncmp(tog_commands[i].name, argv[0],
3499 			    strlen(argv[0])) == 0) {
3500 				cmd = &tog_commands[i];
3501 				if (hflag)
3502 					tog_commands[i].cmd_usage();
3503 				break;
3504 			}
3505 		}
3506 		if (cmd == NULL) {
3507 			/* Did the user specify a repository? */
3508 			char *repo_path = realpath(argv[0], NULL);
3509 			if (repo_path) {
3510 				struct got_repository *repo;
3511 				error = got_repo_open(&repo, repo_path);
3512 				if (error == NULL)
3513 					got_repo_close(repo);
3514 			} else
3515 				error = got_error_from_errno();
3516 			if (error) {
3517 				if (hflag) {
3518 					fprintf(stderr, "%s: '%s' is not a "
3519 					    "known command\n", getprogname(),
3520 					    argv[0]);
3521 					usage();
3522 				}
3523 				fprintf(stderr, "%s: '%s' is neither a known "
3524 				    "command nor a path to a repository\n",
3525 				    getprogname(), argv[0]);
3526 				free(repo_path);
3527 				return 1;
3528 			}
3529 			cmd = &tog_commands[0];
3530 			cmd_argv = make_argv(cmd->name, repo_path);
3531 			argc = 2;
3532 			free(repo_path);
3533 		}
3534 	}
3535 
3536 	init_curses();
3537 
3538 	error = cmd->cmd_main(argc, cmd_argv ? cmd_argv : argv);
3539 	if (error)
3540 		goto done;
3541 done:
3542 	endwin();
3543 	free(cmd_argv);
3544 	if (error)
3545 		fprintf(stderr, "%s: %s\n", getprogname(), error->msg);
3546 	return 0;
3547 }