1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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 /*
18  * Ncurses UI for telescope.
19  *
20  * Text scrolling
21  * ==============
22  *
23  * ncurses allows you to scroll a window, but when a line goes out of
24  * the visible area it's forgotten.  We keep a list of formatted lines
25  * (``visual lines'') that we know fits in the window, and draw them.
26  * This way is easy to scroll: just call wscrl and then render the
27  * first/last line!
28  *
29  * This means that on every resize we have to clear our list of lines
30  * and re-render everything.  A clever approach would be to do this
31  * ``on-demand''.
32  *
33  * TODO: make the text formatting on-demand.
34  *
35  */
36 
37 #include <telescope.h>
38 
39 #include <curses.h>
40 #include <event.h>
41 #include <locale.h>
42 #include <signal.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 
48 #define TAB_CURRENT	0x1
49 
50 #define NEW_TAB_URL	"about:new"
51 
52 static struct event	stdioev, winchev;
53 
54 static void		 load_default_keys(void);
55 static void		 empty_vlist(struct window*);
56 static void		 restore_cursor(struct window*);
57 
58 static void		 cmd_previous_line(struct window*);
59 static void		 cmd_next_line(struct window*);
60 static void		 cmd_backward_char(struct window*);
61 static void		 cmd_forward_char(struct window*);
62 static void		 cmd_backward_paragraph(struct window*);
63 static void		 cmd_forward_paragraph(struct window*);
64 static void		 cmd_move_beginning_of_line(struct window*);
65 static void		 cmd_move_end_of_line(struct window*);
66 static void		 cmd_redraw(struct window*);
67 static void		 cmd_scroll_line_down(struct window*);
68 static void		 cmd_scroll_line_up(struct window*);
69 static void		 cmd_scroll_up(struct window*);
70 static void		 cmd_scroll_down(struct window*);
71 static void		 cmd_beginning_of_buffer(struct window*);
72 static void		 cmd_end_of_buffer(struct window*);
73 static void		 cmd_kill_telescope(struct window*);
74 static void		 cmd_push_button(struct window*);
75 static void		 cmd_push_button_new_tab(struct window*);
76 static void		 cmd_previous_button(struct window*);
77 static void		 cmd_next_button(struct window*);
78 static void		 cmd_previous_page(struct window*);
79 static void		 cmd_next_page(struct window*);
80 static void		 cmd_clear_minibuf(struct window*);
81 static void		 cmd_execute_extended_command(struct window*);
82 static void		 cmd_tab_close(struct window*);
83 static void		 cmd_tab_close_other(struct window*);
84 static void		 cmd_tab_new(struct window*);
85 static void		 cmd_tab_next(struct window*);
86 static void		 cmd_tab_previous(struct window*);
87 static void		 cmd_load_url(struct window*);
88 static void		 cmd_load_current_url(struct window*);
89 static void		 cmd_bookmark_page(struct window*);
90 static void		 cmd_goto_bookmarks(struct window*);
91 
92 static void		 global_key_unbound(void);
93 
94 static void		 cmd_mini_delete_char(struct window*);
95 static void		 cmd_mini_delete_backward_char(struct window*);
96 static void		 cmd_mini_kill_line(struct window*);
97 static void		 cmd_mini_abort(struct window*);
98 static void		 cmd_mini_complete_and_exit(struct window*);
99 static void		 cmd_mini_previous_history_element(struct window*);
100 static void		 cmd_mini_next_history_element(struct window*);
101 
102 static void		 minibuffer_hist_save_entry(void);
103 static void		 minibuffer_taint_hist(void);
104 static void		 minibuffer_self_insert(void);
105 static void		 eecmd_self_insert(void);
106 static void		 eecmd_select(void);
107 static void		 ir_self_insert(void);
108 static void		 ir_select(void);
109 static void		 lu_self_insert(void);
110 static void		 lu_select(void);
111 static void		 bp_select(void);
112 
113 static struct vline	*nth_line(struct window*, size_t);
114 static struct tab	*current_tab(void);
115 static struct window	*current_window(void);
116 static int		 readkey(void);
117 static void		 dispatch_stdio(int, short, void*);
118 static void		 handle_clear_minibuf(int, short, void*);
119 static void		 handle_resize(int, short, void*);
120 static int		 wrap_page(struct window*);
121 static void		 print_vline(struct vline*);
122 static void		 redraw_tabline(void);
123 static void		 redraw_body(struct tab*);
124 static void		 redraw_modeline(struct tab*);
125 static void		 redraw_minibuffer(void);
126 static void		 redraw_tab(struct tab*);
127 static void		 vmessage(const char*, va_list);
128 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
129 static void		 start_loading_anim(struct tab*);
130 static void		 update_loading_anim(int, short, void*);
131 static void		 stop_loading_anim(struct tab*);
132 static void		 load_url_in_tab(struct tab*, const char*);
133 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
134 static void		 exit_minibuffer(void);
135 static void		 switch_to_tab(struct tab*);
136 static struct tab	*new_tab(const char*);
137 static void		 usage(void);
138 
139 static struct { short meta; int key; uint32_t cp; } thiskey;
140 
141 static WINDOW	*tabline, *body, *modeline, *minibuf;
142 static int	 body_lines, body_cols;
143 
144 static struct event	clminibufev;
145 static struct timeval	clminibufev_timer = { 5, 0 };
146 static struct timeval	loadingev_timer = { 0, 250000 };
147 
148 static uint32_t		 tab_counter;
149 
150 static char	keybuf[64];
151 
152 struct kmap global_map,
153 	minibuffer_map,
154 	*current_map,
155 	*base_map;
156 
157 static struct histhead eecmd_history,
158 	ir_history,
159 	lu_history;
160 
161 static int	in_minibuffer;
162 
163 static struct {
164 	char		*curmesg;
165 
166 	char		 prompt[32];
167 	void		 (*donefn)(void);
168 	void		 (*abortfn)(void);
169 
170 	char		 buf[1025];
171 	struct line	 line;
172 	struct vline	 vline;
173 	struct window	 window;
174 
175 	struct histhead	*history;
176 	struct hist	*hist_cur;
177 	size_t		 hist_off;
178 } ministate;
179 
180 struct lineprefix {
181 	const char	*prfx1;
182 	const char	*prfx2;
183 } line_prefixes[] = {
184 	[LINE_TEXT] =		{ "",		"" },
185 	[LINE_LINK] =		{ "=> ",	"   " },
186 	[LINE_TITLE_1] =	{ "# ",		"  " },
187 	[LINE_TITLE_2] =	{ "## ",	"   " },
188 	[LINE_TITLE_3] =	{ "### ",	"    " },
189 	[LINE_ITEM] =		{ "* ",		"  " },
190 	[LINE_QUOTE] =		{ "> ",		"  " },
191 	[LINE_PRE_START] =	{ "```",	"   " },
192 	[LINE_PRE_CONTENT] =	{ "",		"" },
193 	[LINE_PRE_END] =	{ "```",	"```" },
194 };
195 
196 static struct line_face {
197 	int prefix_prop;
198 	int text_prop;
199 } line_faces[] = {
200 	[LINE_TEXT] =		{ 0,		0 },
201 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
202 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
203 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
204 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
205 	[LINE_ITEM] =		{ 0,		0 },
206 	[LINE_QUOTE] =		{ 0,		A_DIM },
207 	[LINE_PRE_START] =	{ 0,		0 },
208 	[LINE_PRE_CONTENT] =	{ 0,		0 },
209 	[LINE_PRE_END] =	{ 0,		0 },
210 };
211 
212 static struct tab_face {
213 	int background, tab, current_tab;
214 } tab_face = {
215 	A_REVERSE, A_REVERSE, A_NORMAL
216 };
217 
218 static void
219 empty_vlist(struct window *window)
220 {
221 	struct vline *vl, *t;
222 
223 	window->current_line = NULL;
224 	window->line_max = 0;
225 
226 	TAILQ_FOREACH_SAFE(vl, &window->head, vlines, t) {
227 		TAILQ_REMOVE(&window->head, vl, vlines);
228 		free(vl->line);
229 		free(vl);
230 	}
231 }
232 
233 static inline void
234 global_set_key(const char *key, void (*fn)(struct window*))
235 {
236 	if (!kmap_define_key(&global_map, key, fn))
237 		_exit(1);
238 }
239 
240 static inline void
241 minibuffer_set_key(const char *key, void (*fn)(struct window*))
242 {
243 	if (!kmap_define_key(&minibuffer_map, key, fn))
244 		_exit(1);
245 }
246 
247 static void
248 load_default_keys(void)
249 {
250 	/* === global map === */
251 
252 	/* emacs */
253 	global_set_key("C-p",		cmd_previous_line);
254 	global_set_key("C-n",		cmd_next_line);
255 	global_set_key("C-f",		cmd_forward_char);
256 	global_set_key("C-b",		cmd_backward_char);
257 	global_set_key("M-{",		cmd_backward_paragraph);
258 	global_set_key("M-}",		cmd_forward_paragraph);
259 	global_set_key("C-a",		cmd_move_beginning_of_line);
260 	global_set_key("C-e",		cmd_move_end_of_line);
261 
262 	global_set_key("M-v",		cmd_scroll_up);
263 	global_set_key("C-v",		cmd_scroll_down);
264 	global_set_key("M-space",	cmd_scroll_up);
265 	global_set_key("space",		cmd_scroll_down);
266 
267 	global_set_key("C-x C-c",	cmd_kill_telescope);
268 
269 	global_set_key("C-g",		cmd_clear_minibuf);
270 
271 	global_set_key("M-x",		cmd_execute_extended_command);
272 	global_set_key("C-x C-f",	cmd_load_url);
273 	global_set_key("C-x M-f",	cmd_load_current_url);
274 
275 	global_set_key("C-x t 0",	cmd_tab_close);
276 	global_set_key("C-x t 1",	cmd_tab_close_other);
277 	global_set_key("C-x t 2",	cmd_tab_new);
278 	global_set_key("C-x t o",	cmd_tab_next);
279 	global_set_key("C-x t O",	cmd_tab_previous);
280 
281 	global_set_key("M-<",		cmd_beginning_of_buffer);
282 	global_set_key("M->",		cmd_end_of_buffer);
283 
284 	global_set_key("C-M-b",		cmd_previous_page);
285 	global_set_key("C-M-f",		cmd_next_page);
286 
287 	global_set_key("<f7> a",	cmd_bookmark_page);
288 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
289 
290 	/* vi/vi-like */
291 	global_set_key("k",		cmd_previous_line);
292 	global_set_key("j",		cmd_next_line);
293 	global_set_key("l",		cmd_forward_char);
294 	global_set_key("h",		cmd_backward_char);
295 	global_set_key("{",		cmd_backward_paragraph);
296 	global_set_key("}",		cmd_forward_paragraph);
297 	global_set_key("^",		cmd_move_beginning_of_line);
298 	global_set_key("$",		cmd_move_end_of_line);
299 
300 	global_set_key("K",		cmd_scroll_line_up);
301 	global_set_key("J",		cmd_scroll_line_down);
302 
303 	global_set_key("g D",		cmd_tab_close);
304 	global_set_key("g N",		cmd_tab_new);
305 	global_set_key("g t",		cmd_tab_next);
306 	global_set_key("g T",		cmd_tab_previous);
307 
308 	global_set_key("g g",		cmd_beginning_of_buffer);
309 	global_set_key("G",		cmd_end_of_buffer);
310 
311 	global_set_key("H",		cmd_previous_page);
312 	global_set_key("L",		cmd_next_page);
313 
314 	/* tmp */
315 	global_set_key("q",		cmd_kill_telescope);
316 
317 	global_set_key("esc",		cmd_clear_minibuf);
318 
319 	global_set_key(":",		cmd_execute_extended_command);
320 
321 	/* cua */
322 	global_set_key("<up>",		cmd_previous_line);
323 	global_set_key("<down>",	cmd_next_line);
324 	global_set_key("<right>",	cmd_forward_char);
325 	global_set_key("<left>",	cmd_backward_char);
326 	global_set_key("<prior>",	cmd_scroll_up);
327 	global_set_key("<next>",	cmd_scroll_down);
328 
329 	global_set_key("M-<left>",	cmd_previous_page);
330 	global_set_key("M-<right>",	cmd_next_page);
331 
332 	/* "ncurses standard" */
333 	global_set_key("C-l",		cmd_redraw);
334 
335 	/* global */
336 	global_set_key("C-m",		cmd_push_button);
337 	global_set_key("M-enter",	cmd_push_button_new_tab);
338 	global_set_key("M-tab",		cmd_previous_button);
339 	global_set_key("tab",		cmd_next_button);
340 
341 	/* === minibuffer map === */
342 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
343 	minibuffer_set_key("C-g",		cmd_mini_abort);
344 	minibuffer_set_key("esc",		cmd_mini_abort);
345 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
346 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
347 
348 	minibuffer_set_key("C-b",		cmd_backward_char);
349 	minibuffer_set_key("C-f",		cmd_forward_char);
350 	minibuffer_set_key("<left>",		cmd_backward_char);
351 	minibuffer_set_key("<right>",		cmd_forward_char);
352 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
353 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
354 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
355 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
356 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
357 
358 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
359 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
360 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
361 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
362 }
363 
364 static void
365 restore_cursor(struct window *window)
366 {
367 	struct vline	*vl;
368 	const char	*prfx;
369 
370 	vl = window->current_line;
371 	if (vl == NULL || vl->line == NULL)
372 		window->curs_x = window->cpoff = 0;
373 	else
374 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
375 
376 	if (vl != NULL) {
377 		prfx = line_prefixes[vl->parent->type].prfx1;
378 		window->curs_x += utf8_swidth(prfx);
379 	}
380 }
381 
382 static void
383 cmd_previous_line(struct window *window)
384 {
385 	struct vline	*vl;
386 
387 	if (window->current_line == NULL
388 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
389 		return;
390 
391 	if (--window->curs_y < 0) {
392 		window->curs_y = 0;
393 		cmd_scroll_line_up(window);
394 		return;
395 	}
396 
397 	window->current_line = vl;
398 	restore_cursor(window);
399 }
400 
401 static void
402 cmd_next_line(struct window *window)
403 {
404 	struct vline	*vl;
405 
406 	if (window->current_line == NULL
407 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
408 		return;
409 
410 	if (++window->curs_y > body_lines-1) {
411 		window->curs_y = body_lines-1;
412 		cmd_scroll_line_down(window);
413 		return;
414 	}
415 
416 	window->current_line = vl;
417 	restore_cursor(window);
418 }
419 
420 static void
421 cmd_backward_char(struct window *window)
422 {
423 	if (window->cpoff != 0)
424 		window->cpoff--;
425 	restore_cursor(window);
426 }
427 
428 static void
429 cmd_forward_char(struct window *window)
430 {
431 	window->cpoff++;
432 	restore_cursor(window);
433 }
434 
435 static void
436 cmd_backward_paragraph(struct window *window)
437 {
438 	do {
439 		if (window->current_line == NULL ||
440 		    window->current_line == TAILQ_FIRST(&window->head)) {
441 			message("No previous paragraph");
442 			return;
443 		}
444 		cmd_previous_line(window);
445 	} while (window->current_line->line != NULL ||
446 	    window->current_line->parent->type != LINE_TEXT);
447 }
448 
449 static void
450 cmd_forward_paragraph(struct window *window)
451 {
452 	do {
453 		if (window->current_line == NULL ||
454 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
455 			message("No next paragraph");
456 			return;
457 		}
458 		cmd_next_line(window);
459 	} while (window->current_line->line != NULL ||
460 	    window->current_line->parent->type != LINE_TEXT);
461 }
462 
463 static void
464 cmd_move_beginning_of_line(struct window *window)
465 {
466 	window->cpoff = 0;
467 	restore_cursor(window);
468 }
469 
470 static void
471 cmd_move_end_of_line(struct window *window)
472 {
473 	struct vline	*vl;
474 
475 	vl = window->current_line;
476 	if (vl->line == NULL)
477 		return;
478 	window->cpoff = utf8_cplen(vl->line);
479 	restore_cursor(window);
480 }
481 
482 static void
483 cmd_redraw(struct window *window)
484 {
485 	handle_resize(0, 0, NULL);
486 }
487 
488 static void
489 cmd_scroll_line_up(struct window *window)
490 {
491 	struct vline	*vl;
492 
493 	if (window->line_off == 0)
494 		return;
495 
496 	vl = nth_line(window, --window->line_off);
497 	wscrl(body, -1);
498 	wmove(body, 0, 0);
499 	print_vline(vl);
500 
501 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
502 	restore_cursor(window);
503 }
504 
505 static void
506 cmd_scroll_line_down(struct window *window)
507 {
508 	struct vline	*vl;
509 
510 	vl = window->current_line;
511 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
512 		return;
513 	window->current_line = vl;
514 
515 	window->line_off++;
516 	wscrl(body, 1);
517 
518 	if (window->line_max - window->line_off < (size_t)body_lines)
519 		return;
520 
521 	vl = nth_line(window, window->line_off + body_lines-1);
522 	wmove(body, body_lines-1, 0);
523 	print_vline(vl);
524 
525 	restore_cursor(window);
526 }
527 
528 static void
529 cmd_scroll_up(struct window *window)
530 {
531 	size_t off;
532 
533 	off = body_lines+1;
534 
535 	for (; off > 0; --off)
536 		cmd_scroll_line_up(window);
537 }
538 
539 static void
540 cmd_scroll_down(struct window *window)
541 {
542 	size_t off;
543 
544 	off = body_lines+1;
545 
546 	for (; off > 0; --off)
547 		cmd_scroll_line_down(window);
548 }
549 
550 static void
551 cmd_beginning_of_buffer(struct window *window)
552 {
553 	window->current_line = TAILQ_FIRST(&window->head);
554 	window->line_off = 0;
555 	window->curs_y = 0;
556 	window->cpoff = 0;
557 	restore_cursor(window);
558 }
559 
560 static void
561 cmd_end_of_buffer(struct window *window)
562 {
563 	ssize_t off;
564 
565 	off = window->line_max - body_lines;
566 	off = MAX(0, off);
567 
568 	window->line_off = off;
569 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
570 
571 	window->current_line = TAILQ_LAST(&window->head, vhead);
572 	window->cpoff = body_cols;
573 	restore_cursor(window);
574 }
575 
576 static void
577 cmd_kill_telescope(struct window *window)
578 {
579 	event_loopbreak();
580 }
581 
582 static void
583 cmd_push_button(struct window *window)
584 {
585 	struct vline	*vl;
586 	size_t		 nth;
587 
588 	nth = window->line_off + window->curs_y;
589 	if (nth >= window->line_max)
590 		return;
591 	vl = nth_line(window, nth);
592 	if (vl->parent->type != LINE_LINK)
593 		return;
594 
595 	load_url_in_tab(current_tab(), vl->parent->alt);
596 }
597 
598 static void
599 cmd_push_button_new_tab(struct window *window)
600 {
601 	struct vline	*vl;
602 	size_t		 nth;
603 
604 	nth = window->line_off + window->curs_y;
605 	if (nth > window->line_max)
606 		return;
607 	vl = nth_line(window, nth);
608 	if (vl->parent->type != LINE_LINK)
609 		return;
610 
611 	new_tab(vl->parent->alt);
612 }
613 
614 static void
615 cmd_previous_button(struct window *window)
616 {
617 	do {
618 		if (window->current_line == NULL ||
619 		    window->current_line == TAILQ_FIRST(&window->head)) {
620 			message("No previous link");
621 			return;
622 		}
623 		cmd_previous_line(window);
624 	} while (window->current_line->parent->type != LINE_LINK);
625 }
626 
627 static void
628 cmd_next_button(struct window *window)
629 {
630 	do {
631 		if (window->current_line == NULL ||
632 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
633 			message("No next link");
634 			return;
635 		}
636 		cmd_next_line(window);
637 	} while (window->current_line->parent->type != LINE_LINK);
638 }
639 
640 static void
641 cmd_previous_page(struct window *window)
642 {
643 	struct tab *tab = current_tab();
644 
645 	if (!load_previous_page(tab))
646 		message("No previous page");
647 	else
648 		start_loading_anim(tab);
649 }
650 
651 static void
652 cmd_next_page(struct window *window)
653 {
654 	struct tab *tab = current_tab();
655 
656 	if (!load_next_page(tab))
657 		message("No next page");
658 	else
659 		start_loading_anim(tab);
660 }
661 
662 static void
663 cmd_clear_minibuf(struct window *window)
664 {
665 	handle_clear_minibuf(0, 0, NULL);
666 }
667 
668 static void
669 cmd_execute_extended_command(struct window *window)
670 {
671 	size_t	 len;
672 
673 	if (in_minibuffer) {
674 		message("We don't have enable-recursive-minibuffers");
675 		return;
676 	}
677 
678 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
679 	    &eecmd_history);
680 
681 	len = sizeof(ministate.prompt);
682 	strlcpy(ministate.prompt, "", len);
683 
684 	if (thiskey.meta)
685 		strlcat(ministate.prompt, "M-", len);
686 
687 	strlcat(ministate.prompt, keyname(thiskey.key), len);
688 	strlcat(ministate.prompt, " ", len);
689 }
690 
691 static void
692 cmd_tab_close(struct window *window)
693 {
694 	struct tab *tab, *t;
695 
696 	tab = current_tab();
697 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
698 	    TAILQ_NEXT(tab, tabs) == NULL) {
699 		message("Can't close the only tab.");
700 		return;
701 	}
702 
703 	if (evtimer_pending(&tab->loadingev, NULL))
704 		evtimer_del(&tab->loadingev);
705 
706 	stop_tab(tab);
707 
708 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
709 		t = TAILQ_NEXT(tab, tabs);
710 	TAILQ_REMOVE(&tabshead, tab, tabs);
711 	free(tab);
712 
713 	switch_to_tab(t);
714 }
715 
716 static void
717 cmd_tab_close_other(struct window *window)
718 {
719 	struct tab *tab, *t, *i;
720 
721 	tab = current_tab();
722 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
723 		if (t->flags & TAB_CURRENT)
724 			continue;
725 
726 		stop_tab(t);
727 		TAILQ_REMOVE(&tabshead, t, tabs);
728 		free(t);
729 	}
730 }
731 
732 static void
733 cmd_tab_new(struct window *window)
734 {
735 	new_tab(NEW_TAB_URL);
736 }
737 
738 static void
739 cmd_tab_next(struct window *window)
740 {
741 	struct tab *tab, *t;
742 
743 	tab = current_tab();
744 	tab->flags &= ~TAB_CURRENT;
745 
746 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
747 		t = TAILQ_FIRST(&tabshead);
748 	t->flags |= TAB_CURRENT;
749 }
750 
751 static void
752 cmd_tab_previous(struct window *window)
753 {
754 	struct tab *tab, *t;
755 
756 	tab = current_tab();
757 	tab->flags &= ~TAB_CURRENT;
758 
759 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
760 		t = TAILQ_LAST(&tabshead, tabshead);
761 	t->flags |= TAB_CURRENT;
762 }
763 
764 static void
765 cmd_load_url(struct window *window)
766 {
767 	if (in_minibuffer) {
768 		message("We don't have enable-recursive-minibuffers");
769 		return;
770 	}
771 
772 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
773 	    &lu_history);
774 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
775 }
776 
777 static void
778 cmd_load_current_url(struct window *window)
779 {
780 	struct tab *tab = current_tab();
781 
782 	if (in_minibuffer) {
783 		message("We don't have enable-recursive-minibuffers");
784 		return;
785 	}
786 
787 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
788 	    &lu_history);
789 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
790 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
791 	ministate.window.cpoff = utf8_cplen(ministate.buf);
792 }
793 
794 static void
795 cmd_bookmark_page(struct window *window)
796 {
797 	struct tab *tab = current_tab();
798 
799 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
800 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
801 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
802 	ministate.window.cpoff = utf8_cplen(ministate.buf);
803 }
804 
805 static void
806 cmd_goto_bookmarks(struct window *window)
807 {
808 	load_url_in_tab(current_tab(), "about:bookmarks");
809 }
810 
811 static void
812 global_key_unbound(void)
813 {
814 	message("%s is undefined", keybuf);
815 }
816 
817 static void
818 cmd_mini_delete_char(struct window *window)
819 {
820 	char *c, *n;
821 
822 	if (!in_minibuffer) {
823 		message("text is read-only");
824 		return;
825 	}
826 
827 	minibuffer_taint_hist();
828 
829 	c = utf8_nth(window->current_line->line, window->cpoff);
830 	if (*c == '\0')
831 		return;
832 	n = utf8_next_cp(c);
833 
834 	memmove(c, n, strlen(n)+1);
835 }
836 
837 static void
838 cmd_mini_delete_backward_char(struct window *window)
839 {
840 	char *c, *p, *start;
841 
842 	if (!in_minibuffer) {
843 		message("text is read-only");
844 		return;
845 	}
846 
847 	minibuffer_taint_hist();
848 
849 	c = utf8_nth(window->current_line->line, window->cpoff);
850 	start = window->current_line->line;
851 	if (c == start)
852 		return;
853 	p = utf8_prev_cp(c-1, start);
854 
855 	memmove(p, c, strlen(c)+1);
856 	window->cpoff--;
857 }
858 
859 static void
860 cmd_mini_kill_line(struct window *window)
861 {
862 	char *c;
863 
864 	if (!in_minibuffer) {
865 		message("text is read-only");
866 		return;
867 	}
868 
869 	minibuffer_taint_hist();
870 	c = utf8_nth(window->current_line->line, window->cpoff);
871 	*c = '\0';
872 }
873 
874 static void
875 cmd_mini_abort(struct window *window)
876 {
877 	if (!in_minibuffer)
878 		return;
879 
880 	ministate.abortfn();
881 }
882 
883 static void
884 cmd_mini_complete_and_exit(struct window *window)
885 {
886 	if (!in_minibuffer)
887 		return;
888 
889 	minibuffer_taint_hist();
890 	ministate.donefn();
891 }
892 
893 static void
894 cmd_mini_previous_history_element(struct window *window)
895 {
896 	if (ministate.history == NULL) {
897 		message("No history");
898 		return;
899 	}
900 
901 	if (ministate.hist_cur == NULL ||
902 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
903 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
904 		ministate.hist_off = ministate.history->len - 1;
905 		if (ministate.hist_cur == NULL)
906 			message("No prev item");
907 	} else {
908 		ministate.hist_off--;
909 	}
910 
911 	if (ministate.hist_cur != NULL)
912 		window->current_line->line = ministate.hist_cur->h;
913 }
914 
915 static void
916 cmd_mini_next_history_element(struct window *window)
917 {
918 	if (ministate.history == NULL) {
919 		message("No history");
920 		return;
921 	}
922 
923 	if (ministate.hist_cur == NULL ||
924 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
925 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
926 		ministate.hist_off = 0;
927 		if (ministate.hist_cur == NULL)
928 			message("No next item");
929 	} else {
930 		ministate.hist_off++;
931 	}
932 
933 	if (ministate.hist_cur != NULL)
934 		window->current_line->line = ministate.hist_cur->h;
935 }
936 
937 static void
938 minibuffer_hist_save_entry(void)
939 {
940 	struct hist	*hist;
941 
942 	if (ministate.history == NULL)
943 		return;
944 
945 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
946 		abort();
947 
948 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
949 
950 	if (TAILQ_EMPTY(&ministate.history->head))
951 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
952 	else
953 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
954 	ministate.history->len++;
955 }
956 
957 /*
958  * taint the minibuffer cache: if we're currently showing a history
959  * element, copy that to the current buf and reset the "history
960  * navigation" thing.
961  */
962 static void
963 minibuffer_taint_hist(void)
964 {
965 	if (ministate.hist_cur == NULL)
966 		return;
967 
968 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
969 	ministate.hist_cur = NULL;
970 }
971 
972 static void
973 minibuffer_self_insert(void)
974 {
975 	char	*c, tmp[5] = {0};
976 	size_t	len;
977 
978 	minibuffer_taint_hist();
979 
980 	if (thiskey.cp == 0)
981 		return;
982 
983 	len = utf8_encode(thiskey.cp, tmp);
984 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
985 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
986 		return;
987 
988 	memmove(c + len, c, strlen(c)+1);
989 	memcpy(c, tmp, len);
990 	ministate.window.cpoff++;
991 }
992 
993 static void
994 eecmd_self_insert(void)
995 {
996 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
997 	    !unicode_isgraph(thiskey.cp)) {
998 		global_key_unbound();
999 		return;
1000 	}
1001 
1002 	minibuffer_self_insert();
1003 }
1004 
1005 static void
1006 eecmd_select(void)
1007 {
1008 	exit_minibuffer();
1009 	minibuffer_hist_save_entry();
1010 	message("TODO: try to execute %s", ministate.buf);
1011 }
1012 
1013 static void
1014 ir_self_insert(void)
1015 {
1016 	minibuffer_self_insert();
1017 }
1018 
1019 static void
1020 ir_select(void)
1021 {
1022 	char		 buf[1025] = {0};
1023 	struct url	 url;
1024 	struct tab	*tab;
1025 
1026 	tab = current_tab();
1027 
1028 	exit_minibuffer();
1029 	minibuffer_hist_save_entry();
1030 
1031 	/* a bit ugly but... */
1032 	memcpy(&url, &tab->url, sizeof(tab->url));
1033 	url_set_query(&url, ministate.buf);
1034 	url_unparse(&url, buf, sizeof(buf));
1035 	load_url_in_tab(tab, buf);
1036 }
1037 
1038 static void
1039 lu_self_insert(void)
1040 {
1041 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1042 	    !unicode_isgraph(thiskey.key)) {
1043 		global_key_unbound();
1044 		return;
1045 	}
1046 
1047 	minibuffer_self_insert();
1048 }
1049 
1050 static void
1051 lu_select(void)
1052 {
1053 	exit_minibuffer();
1054 	minibuffer_hist_save_entry();
1055 	load_url_in_tab(current_tab(), ministate.buf);
1056 }
1057 
1058 static void
1059 bp_select(void)
1060 {
1061 	exit_minibuffer();
1062 	if (*ministate.buf != '\0')
1063 		add_to_bookmarks(ministate.buf);
1064 	else
1065 		message("Abort.");
1066 }
1067 
1068 static struct vline *
1069 nth_line(struct window *window, size_t n)
1070 {
1071 	struct vline	*vl;
1072 	size_t		 i;
1073 
1074 	i = 0;
1075 	TAILQ_FOREACH(vl, &window->head, vlines) {
1076 		if (i == n)
1077 			return vl;
1078 		i++;
1079 	}
1080 
1081 	/* unreachable */
1082 	abort();
1083 }
1084 
1085 static struct tab *
1086 current_tab(void)
1087 {
1088 	struct tab *t;
1089 
1090 	TAILQ_FOREACH(t, &tabshead, tabs) {
1091 		if (t->flags & TAB_CURRENT)
1092 			return t;
1093 	}
1094 
1095 	/* unreachable */
1096 	abort();
1097 }
1098 
1099 static struct window *
1100 current_window(void)
1101 {
1102 	if (in_minibuffer)
1103 		return &ministate.window;
1104 	return &current_tab()->window;
1105 }
1106 
1107 static int
1108 readkey(void)
1109 {
1110 	uint32_t state = 0;
1111 
1112 	if ((thiskey.key = wgetch(body)) == ERR)
1113 		return 0;
1114 
1115 	thiskey.meta = thiskey.key == 27;
1116 	if (thiskey.meta) {
1117 		thiskey.key = wgetch(body);
1118 		if (thiskey.key == ERR || thiskey.key == 27) {
1119 			thiskey.meta = 0;
1120 			thiskey.key = 27;
1121 		}
1122 	}
1123 
1124 	thiskey.cp = 0;
1125 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1126 		while (1) {
1127 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1128 				break;
1129 			if ((thiskey.key = wgetch(body)) == ERR) {
1130 				message("Error decoding user input");
1131 				return 0;
1132 			}
1133 		}
1134 	}
1135 
1136 	return 1;
1137 }
1138 
1139 static void
1140 dispatch_stdio(int fd, short ev, void *d)
1141 {
1142 	struct keymap	*k;
1143 	const char	*keyname;
1144 	char		 tmp[5] = {0};
1145 
1146 	if (!readkey())
1147 		return;
1148 
1149 	if (keybuf[0] != '\0')
1150 		strlcat(keybuf, " ", sizeof(keybuf));
1151 	if (thiskey.meta)
1152 		strlcat(keybuf, "M-", sizeof(keybuf));
1153 	if (thiskey.cp != 0) {
1154 		utf8_encode(thiskey.cp, tmp);
1155 		strlcat(keybuf, tmp, sizeof(keybuf));
1156 	} else {
1157 		if ((keyname = unkbd(thiskey.key)) != NULL)
1158 			strlcat(keybuf, keyname, sizeof(keybuf));
1159 		else {
1160 			tmp[0] = thiskey.key;
1161 			strlcat(keybuf, tmp, sizeof(keybuf));
1162 		}
1163 	}
1164 
1165 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1166 		if (k->meta == thiskey.meta &&
1167 		    k->key == thiskey.key) {
1168 			if (k->fn == NULL)
1169 				current_map = &k->map;
1170 			else {
1171 				current_map = base_map;
1172 				strlcpy(keybuf, "", sizeof(keybuf));
1173 				k->fn(current_window());
1174 			}
1175 			goto done;
1176 		}
1177 	}
1178 
1179 	if (current_map->unhandled_input != NULL)
1180 		current_map->unhandled_input();
1181 	else {
1182 		global_key_unbound();
1183 	}
1184 
1185 	strlcpy(keybuf, "", sizeof(keybuf));
1186 	current_map = base_map;
1187 
1188 done:
1189 	redraw_tab(current_tab());
1190 }
1191 
1192 static void
1193 handle_clear_minibuf(int fd, short ev, void *d)
1194 {
1195 	free(ministate.curmesg);
1196 	ministate.curmesg = NULL;
1197 
1198 	redraw_minibuffer();
1199 	if (in_minibuffer) {
1200 		wrefresh(body);
1201 		wrefresh(minibuf);
1202 	} else {
1203 		wrefresh(minibuf);
1204 		wrefresh(body);
1205 	}
1206 }
1207 
1208 static void
1209 handle_resize(int sig, short ev, void *d)
1210 {
1211 	struct tab	*tab;
1212 
1213 	endwin();
1214 	refresh();
1215 	clear();
1216 
1217 	/* move and resize the windows, in reverse order! */
1218 
1219 	mvwin(minibuf, LINES-1, 0);
1220 	wresize(minibuf, 1, COLS);
1221 
1222 	mvwin(modeline, LINES-2, 0);
1223 	wresize(modeline, 1, COLS);
1224 
1225 	wresize(body, LINES-3, COLS);
1226 	body_lines = LINES-3;
1227 	body_cols = COLS;
1228 
1229 	wresize(tabline, 1, COLS);
1230 
1231 	tab = current_tab();
1232 
1233 	wrap_page(&tab->window);
1234 	redraw_tab(tab);
1235 }
1236 
1237 static int
1238 wrap_page(struct window *window)
1239 {
1240 	struct line		*l;
1241 	const struct line	*orig;
1242 	struct vline		*vl;
1243 	const char		*prfx;
1244 
1245 	orig = window->current_line == NULL
1246 		? NULL
1247 		: window->current_line->parent;
1248 	window->current_line = NULL;
1249 
1250 	window->curs_y = 0;
1251 	window->line_off = 0;
1252 
1253 	empty_vlist(window);
1254 
1255 	TAILQ_FOREACH(l, &window->page.head, lines) {
1256 		prfx = line_prefixes[l->type].prfx1;
1257 		switch (l->type) {
1258 		case LINE_TEXT:
1259 		case LINE_LINK:
1260 		case LINE_TITLE_1:
1261 		case LINE_TITLE_2:
1262 		case LINE_TITLE_3:
1263 		case LINE_ITEM:
1264 		case LINE_QUOTE:
1265 		case LINE_PRE_START:
1266 		case LINE_PRE_END:
1267 			wrap_text(window, prfx, l, body_cols);
1268 			break;
1269 		case LINE_PRE_CONTENT:
1270                         hardwrap_text(window, l, body_cols);
1271 			break;
1272 		}
1273 
1274 		if (orig == l && window->current_line == NULL) {
1275 			window->line_off = window->line_max-1;
1276 			window->current_line = TAILQ_LAST(&window->head, vhead);
1277 
1278 			while (1) {
1279 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1280 				if (vl == NULL || vl->parent != orig)
1281 					break;
1282 				window->current_line = vl;
1283 				window->line_off--;
1284 			}
1285 		}
1286 	}
1287 
1288         if (window->current_line == NULL)
1289 		window->current_line = TAILQ_FIRST(&window->head);
1290 
1291 	return 1;
1292 }
1293 
1294 static void
1295 print_vline(struct vline *vl)
1296 {
1297 	const char *text = vl->line;
1298 	const char *prfx;
1299 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1300 	int text_face = line_faces[vl->parent->type].text_prop;
1301 
1302 	if (!vl->flags)
1303 		prfx = line_prefixes[vl->parent->type].prfx1;
1304 	else
1305 		prfx = line_prefixes[vl->parent->type].prfx2;
1306 
1307 	if (text == NULL)
1308 		text = "";
1309 
1310 	wattron(body, prefix_face);
1311 	wprintw(body, "%s", prfx);
1312 	wattroff(body, prefix_face);
1313 
1314 	wattron(body, text_face);
1315 	wprintw(body, "%s", text);
1316 	wattroff(body, text_face);
1317 }
1318 
1319 static void
1320 redraw_tabline(void)
1321 {
1322 	struct tab	*tab;
1323 	size_t		 toskip;
1324 	int		 current, x, y, truncated;
1325 	const char	*title;
1326 	char		 buf[25];
1327 
1328 	toskip = 0;
1329 	x = 1;
1330 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1331 		x += sizeof(buf) + 1;
1332 		toskip++;
1333 		if (tab->flags & TAB_CURRENT)
1334 			break;
1335 	}
1336 	if (x < COLS-2)
1337 		toskip = 0;
1338 	else
1339 		toskip--;
1340 
1341 	werase(tabline);
1342 	wattron(tabline, tab_face.background);
1343 	wprintw(tabline, toskip == 0 ? " " : "<");
1344 	wattroff(tabline, tab_face.background);
1345 
1346 	truncated = 0;
1347 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1348 		if (truncated)
1349 			break;
1350 		if (toskip != 0) {
1351 			toskip--;
1352 			continue;
1353 		}
1354 
1355 		getyx(tabline, y, x);
1356 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1357 			truncated = 1;
1358 
1359 		current = tab->flags & TAB_CURRENT;
1360 
1361 		if (*(title = tab->window.page.title) == '\0')
1362 			title = tab->hist_cur->h;
1363 
1364 		strlcpy(buf, " ", sizeof(buf));
1365                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1366 			/* truncation happens */
1367 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1368 		} else {
1369 			/* pad with spaces */
1370 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1371 				/* nop */ ;
1372 		}
1373 
1374 		if (current)
1375 			wattron(tabline, tab_face.current_tab);
1376 		else
1377 			wattron(tabline, tab_face.tab);
1378 
1379 		wprintw(tabline, "%s", buf);
1380 		if (TAILQ_NEXT(tab, tabs) != NULL)
1381 			wprintw(tabline, " ");
1382 
1383 		if (current)
1384 			wattroff(tabline, tab_face.current_tab);
1385 		else
1386 			wattroff(tabline, tab_face.tab);
1387 	}
1388 
1389 	wattron(tabline, tab_face.background);
1390 	for (; x < COLS; ++x)
1391 		waddch(tabline, ' ');
1392 	if (truncated)
1393 		mvwprintw(tabline, 0, COLS-1, ">");
1394 }
1395 
1396 static inline char
1397 trust_status_char(enum trust_state ts)
1398 {
1399 	switch (ts) {
1400 	case TS_UNKNOWN:	return 'u';
1401 	case TS_UNTRUSTED:	return '!';
1402 	case TS_TRUSTED:	return 'v';
1403 	case TS_VERIFIED:	return 'V';
1404 	}
1405 }
1406 
1407 static void
1408 redraw_modeline(struct tab *tab)
1409 {
1410 	double		 pct;
1411 	int		 x, y, max_x, max_y;
1412 	const char	*mode = tab->window.page.name;
1413 	const char	*spin = "-\\|/";
1414 
1415 	werase(modeline);
1416 	wattron(modeline, A_REVERSE);
1417 	wmove(modeline, 0, 0);
1418 
1419 	wprintw(modeline, "-%c%c %s ",
1420 	    spin[tab->loading_anim_step],
1421 	    trust_status_char(tab->trust),
1422 	    mode == NULL ? "(none)" : mode);
1423 
1424 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1425 
1426 	if (tab->window.line_max <= (size_t)body_lines)
1427                 wprintw(modeline, "All ");
1428 	else if (tab->window.line_off == 0)
1429                 wprintw(modeline, "Top ");
1430 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1431 		wprintw(modeline, "Bottom ");
1432 	else
1433 		wprintw(modeline, "%.0f%% ", pct);
1434 
1435 	wprintw(modeline, "%d/%d %s ",
1436 	    tab->window.line_off + tab->window.curs_y,
1437 	    tab->window.line_max,
1438 	    tab->hist_cur->h);
1439 
1440 	getyx(modeline, y, x);
1441 	getmaxyx(modeline, max_y, max_x);
1442 
1443 	(void)y;
1444 	(void)max_y;
1445 
1446 	for (; x < max_x; ++x)
1447 		waddstr(modeline, "-");
1448 }
1449 
1450 static void
1451 redraw_minibuffer(void)
1452 {
1453 	struct tab *tab;
1454 	size_t off_y, off_x = 0;
1455 	char *start, *c;
1456 
1457 	werase(minibuf);
1458 
1459 	if (in_minibuffer) {
1460 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1461 		if (ministate.hist_cur != NULL)
1462 			wprintw(minibuf, "(%zu/%zu) ",
1463 			    ministate.hist_off + 1,
1464 			    ministate.history->len);
1465 
1466 		getyx(minibuf, off_y, off_x);
1467 
1468 		start = ministate.hist_cur != NULL
1469 			? ministate.hist_cur->h
1470 			: ministate.buf;
1471 		c = utf8_nth(ministate.window.current_line->line,
1472 		    ministate.window.cpoff);
1473 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1474 			start = utf8_next_cp(start);
1475 		}
1476 
1477 		waddstr(minibuf, start);
1478 	}
1479 
1480 	if (ministate.curmesg != NULL)
1481                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1482 		    ministate.curmesg);
1483 
1484 	if (!in_minibuffer && ministate.curmesg == NULL)
1485 		waddstr(minibuf, keybuf);
1486 
1487 	/* If nothing else, show the URL at point */
1488 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1489 		tab = current_tab();
1490 		if (tab->window.current_line != NULL &&
1491 		    tab->window.current_line->parent->type == LINE_LINK)
1492 			waddstr(minibuf, tab->window.current_line->parent->alt);
1493 	}
1494 
1495 	if (in_minibuffer)
1496 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1497 }
1498 
1499 static void
1500 redraw_tab(struct tab *tab)
1501 {
1502 	redraw_tabline();
1503 	redraw_body(tab);
1504 	redraw_modeline(tab);
1505 	redraw_minibuffer();
1506 
1507 	wrefresh(tabline);
1508 	wrefresh(modeline);
1509 
1510 	if (in_minibuffer) {
1511 		wrefresh(body);
1512 		wrefresh(minibuf);
1513 	} else {
1514 		wrefresh(minibuf);
1515 		wrefresh(body);
1516 	}
1517 }
1518 
1519 static void
1520 redraw_body(struct tab *tab)
1521 {
1522 	struct vline	*vl;
1523 	int		 line;
1524 
1525 	werase(body);
1526 
1527 	tab->window.line_off = MIN(tab->window.line_max-1, tab->window.line_off);
1528 	if (TAILQ_EMPTY(&tab->window.head))
1529 		return;
1530 
1531 	line = 0;
1532 	vl = nth_line(&tab->window, tab->window.line_off);
1533 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1534 		wmove(body, line, 0);
1535 		print_vline(vl);
1536 		line++;
1537 		if (line == body_lines)
1538 			break;
1539 	}
1540 
1541 	wmove(body, tab->window.curs_y, tab->window.curs_x);
1542 }
1543 
1544 static void
1545 vmessage(const char *fmt, va_list ap)
1546 {
1547 	if (evtimer_pending(&clminibufev, NULL))
1548 		evtimer_del(&clminibufev);
1549 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1550 	evtimer_add(&clminibufev, &clminibufev_timer);
1551 
1552 	free(ministate.curmesg);
1553 
1554 	/* TODO: what to do if the allocation fails here? */
1555 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1556 		ministate.curmesg = NULL;
1557 
1558 	redraw_minibuffer();
1559 	if (in_minibuffer) {
1560 		wrefresh(body);
1561 		wrefresh(minibuf);
1562 	} else {
1563 		wrefresh(minibuf);
1564 		wrefresh(body);
1565 	}
1566 }
1567 
1568 static void
1569 message(const char *fmt, ...)
1570 {
1571 	va_list ap;
1572 
1573 	va_start(ap, fmt);
1574 	vmessage(fmt, ap);
1575 	va_end(ap);
1576 }
1577 
1578 static void
1579 start_loading_anim(struct tab *tab)
1580 {
1581 	if (tab->loading_anim)
1582 		return;
1583 	tab->loading_anim = 1;
1584 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1585 	evtimer_add(&tab->loadingev, &loadingev_timer);
1586 }
1587 
1588 static void
1589 update_loading_anim(int fd, short ev, void *d)
1590 {
1591 	struct tab	*tab = d;
1592 
1593 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1594 
1595 	if (tab->flags & TAB_CURRENT) {
1596 		redraw_modeline(tab);
1597 		wrefresh(modeline);
1598 		wrefresh(body);
1599 		if (in_minibuffer)
1600 			wrefresh(minibuf);
1601 	}
1602 
1603 	evtimer_add(&tab->loadingev, &loadingev_timer);
1604 }
1605 
1606 static void
1607 stop_loading_anim(struct tab *tab)
1608 {
1609 	if (!tab->loading_anim)
1610 		return;
1611 	evtimer_del(&tab->loadingev);
1612 	tab->loading_anim = 0;
1613 	tab->loading_anim_step = 0;
1614 
1615 	if (!(tab->flags & TAB_CURRENT))
1616 		return;
1617 
1618 	redraw_modeline(tab);
1619 
1620 	wrefresh(modeline);
1621 	wrefresh(body);
1622 	if (in_minibuffer)
1623 		wrefresh(minibuf);
1624 }
1625 
1626 static void
1627 load_url_in_tab(struct tab *tab, const char *url)
1628 {
1629 	empty_vlist(&tab->window);
1630 	message("Loading %s...", url);
1631 	start_loading_anim(tab);
1632 	load_url(tab, url);
1633 
1634 	tab->window.curs_x = 0;
1635 	tab->window.curs_y = 0;
1636 	redraw_tab(tab);
1637 }
1638 
1639 static void
1640 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1641     void (*abortfn)(void), struct histhead *hist)
1642 {
1643 	in_minibuffer = 1;
1644 	base_map = &minibuffer_map;
1645 	current_map = &minibuffer_map;
1646 
1647 	base_map->unhandled_input = self_insert_fn;
1648 
1649 	ministate.donefn = donefn;
1650 	ministate.abortfn = abortfn;
1651 	memset(ministate.buf, 0, sizeof(ministate.buf));
1652 	ministate.window.current_line = &ministate.vline;
1653 	ministate.window.current_line->line = ministate.buf;
1654 	ministate.window.cpoff = 0;
1655 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1656 
1657 	ministate.history = hist;
1658 	ministate.hist_cur = NULL;
1659 	ministate.hist_off = 0;
1660 }
1661 
1662 static void
1663 exit_minibuffer(void)
1664 {
1665 	werase(minibuf);
1666 
1667 	in_minibuffer = 0;
1668 	base_map = &global_map;
1669 	current_map = &global_map;
1670 }
1671 
1672 static void
1673 switch_to_tab(struct tab *tab)
1674 {
1675 	struct tab	*t;
1676 
1677 	TAILQ_FOREACH(t, &tabshead, tabs) {
1678 		t->flags &= ~TAB_CURRENT;
1679 	}
1680 
1681 	tab->flags |= TAB_CURRENT;
1682 }
1683 
1684 static struct tab *
1685 new_tab(const char *url)
1686 {
1687 	struct tab	*tab;
1688 
1689 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1690 		event_loopbreak();
1691 		return NULL;
1692 	}
1693 
1694 	TAILQ_INIT(&tab->hist.head);
1695 
1696 	TAILQ_INIT(&tab->window.head);
1697 
1698 	tab->id = tab_counter++;
1699 	switch_to_tab(tab);
1700 
1701 	if (TAILQ_EMPTY(&tabshead))
1702 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1703 	else
1704 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1705 
1706 	load_url_in_tab(tab, url);
1707 	return tab;
1708 }
1709 
1710 static void
1711 usage(void)
1712 {
1713 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1714 }
1715 
1716 int
1717 ui_init(int argc, char * const *argv)
1718 {
1719 	const char *url = NEW_TAB_URL;
1720 	int ch;
1721 
1722 	while ((ch = getopt(argc, argv, "")) != -1) {
1723 		switch (ch) {
1724 		default:
1725 			usage();
1726 			return 0;
1727 		}
1728 	}
1729 	argc -= optind;
1730 	argv += optind;
1731 
1732 	if (argc != 0)
1733 		url = argv[0];
1734 
1735 	setlocale(LC_ALL, "");
1736 
1737 	TAILQ_INIT(&global_map.m);
1738 	global_map.unhandled_input = global_key_unbound;
1739 
1740 	TAILQ_INIT(&minibuffer_map.m);
1741 
1742 	TAILQ_INIT(&eecmd_history.head);
1743 	TAILQ_INIT(&ir_history.head);
1744 	TAILQ_INIT(&lu_history.head);
1745 
1746 	ministate.line.type = LINE_TEXT;
1747 	ministate.vline.parent = &ministate.line;
1748 	ministate.window.current_line = &ministate.vline;
1749 
1750 	base_map = &global_map;
1751 	current_map = &global_map;
1752 	load_default_keys();
1753 
1754 	initscr();
1755 	raw();
1756 	noecho();
1757 
1758 	nonl();
1759 	intrflush(stdscr, FALSE);
1760 
1761 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1762 		return 0;
1763 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1764 		return 0;
1765 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1766 		return 0;
1767 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1768 		return 0;
1769 
1770 	body_lines = LINES-3;
1771 	body_cols = COLS;
1772 
1773 	keypad(body, TRUE);
1774 	scrollok(body, TRUE);
1775 
1776 	/* non-blocking input */
1777 	wtimeout(body, 0);
1778 
1779 	mvwprintw(body, 0, 0, "");
1780 
1781 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1782 	event_add(&stdioev, NULL);
1783 
1784 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1785 	signal_add(&winchev, NULL);
1786 
1787 	new_tab(url);
1788 
1789 	return 1;
1790 }
1791 
1792 void
1793 ui_on_tab_loaded(struct tab *tab)
1794 {
1795 	stop_loading_anim(tab);
1796 	message("Loaded %s", tab->hist_cur->h);
1797 
1798 	redraw_tabline();
1799 	wrefresh(tabline);
1800 	if (in_minibuffer)
1801 		wrefresh(minibuf);
1802 	else
1803 		wrefresh(body);
1804 }
1805 
1806 void
1807 ui_on_tab_refresh(struct tab *tab)
1808 {
1809 	wrap_page(&tab->window);
1810 	if (tab->flags & TAB_CURRENT) {
1811 		restore_cursor(&tab->window);
1812 		redraw_tab(tab);
1813 	}
1814 }
1815 
1816 void
1817 ui_require_input(struct tab *tab, int hide)
1818 {
1819 	/* TODO: hard-switching to another tab is ugly */
1820 	switch_to_tab(tab);
1821 
1822 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1823 	    &ir_history);
1824 	strlcpy(ministate.prompt, "Input required: ",
1825 	    sizeof(ministate.prompt));
1826 	redraw_tab(tab);
1827 }
1828 
1829 void
1830 ui_notify(const char *fmt, ...)
1831 {
1832 	va_list ap;
1833 
1834 	va_start(ap, fmt);
1835 	vmessage(fmt, ap);
1836 	va_end(ap);
1837 }
1838 
1839 void
1840 ui_end(void)
1841 {
1842 	endwin();
1843 }