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