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 <ctype.h>
40 #include <curses.h>
41 #include <event.h>
42 #include <locale.h>
43 #include <signal.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <unistd.h>
48 
49 #define TAB_CURRENT	0x1
50 
51 #define NEW_TAB_URL	"about:new"
52 
53 static struct event	stdioev, winchev;
54 
55 static void		 load_default_keys(void);
56 static void		 empty_vlist(struct tab*);
57 static void		 restore_cursor(struct tab *);
58 
59 static void		 cmd_previous_line(struct tab*);
60 static void		 cmd_next_line(struct tab*);
61 static void		 cmd_backward_char(struct tab*);
62 static void		 cmd_forward_char(struct tab*);
63 static void		 cmd_backward_paragraph(struct tab*);
64 static void		 cmd_forward_paragraph(struct tab*);
65 static void		 cmd_move_beginning_of_line(struct tab*);
66 static void		 cmd_move_end_of_line(struct tab*);
67 static void		 cmd_redraw(struct tab*);
68 static void		 cmd_scroll_line_down(struct tab*);
69 static void		 cmd_scroll_line_up(struct tab*);
70 static void		 cmd_scroll_up(struct tab*);
71 static void		 cmd_scroll_down(struct tab*);
72 static void		 cmd_beginning_of_buffer(struct tab*);
73 static void		 cmd_end_of_buffer(struct tab*);
74 static void		 cmd_kill_telescope(struct tab*);
75 static void		 cmd_push_button(struct tab*);
76 static void		 cmd_push_button_new_tab(struct tab*);
77 static void		 cmd_previous_button(struct tab*);
78 static void		 cmd_next_button(struct tab*);
79 static void		 cmd_previous_page(struct tab*);
80 static void		 cmd_next_page(struct tab*);
81 static void		 cmd_clear_minibuf(struct tab*);
82 static void		 cmd_execute_extended_command(struct tab*);
83 static void		 cmd_tab_close(struct tab*);
84 static void		 cmd_tab_close_other(struct tab*);
85 static void		 cmd_tab_new(struct tab*);
86 static void		 cmd_tab_next(struct tab*);
87 static void		 cmd_tab_previous(struct tab*);
88 static void		 cmd_load_url(struct tab*);
89 static void		 cmd_load_current_url(struct tab*);
90 static void		 cmd_bookmark_page(struct tab*);
91 static void		 cmd_goto_bookmarks(struct tab*);
92 
93 static void		 global_key_unbound(void);
94 
95 static void		 cmd_mini_delete_char(struct tab*);
96 static void		 cmd_mini_delete_backward_char(struct tab*);
97 static void		 cmd_mini_forward_char(struct tab*);
98 static void		 cmd_mini_backward_char(struct tab*);
99 static void		 cmd_mini_move_end_of_line(struct tab*);
100 static void		 cmd_mini_move_beginning_of_line(struct tab*);
101 static void		 cmd_mini_kill_line(struct tab*);
102 static void		 cmd_mini_abort(struct tab*);
103 static void		 cmd_mini_complete_and_exit(struct tab*);
104 static void		 cmd_mini_previous_history_element(struct tab*);
105 static void		 cmd_mini_next_history_element(struct tab*);
106 
107 static void		 minibuffer_hist_save_entry(void);
108 static void		 minibuffer_taint_hist(void);
109 static void		 minibuffer_self_insert(void);
110 static void		 eecmd_self_insert(void);
111 static void		 eecmd_select(void);
112 static void		 ir_self_insert(void);
113 static void		 ir_select(void);
114 static void		 lu_self_insert(void);
115 static void		 lu_select(void);
116 static void		 bp_select(void);
117 
118 static struct vline	*nth_line(struct tab*, size_t);
119 static struct tab	*current_tab(void);
120 static void		 dispatch_stdio(int, short, void*);
121 static void		 handle_clear_minibuf(int, short, void*);
122 static void		 handle_resize(int, short, void*);
123 static int		 wrap_page(struct tab*);
124 static void		 print_vline(struct vline*);
125 static void		 redraw_tabline(void);
126 static void		 redraw_body(struct tab*);
127 static void		 redraw_modeline(struct tab*);
128 static void		 redraw_minibuffer(void);
129 static void		 redraw_tab(struct tab*);
130 static void		 vmessage(const char*, va_list);
131 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
132 static void		 start_loading_anim(struct tab*);
133 static void		 update_loading_anim(int, short, void*);
134 static void		 stop_loading_anim(struct tab*);
135 static void		 load_url_in_tab(struct tab*, const char*);
136 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
137 static void		 exit_minibuffer(void);
138 static void		 switch_to_tab(struct tab*);
139 static struct tab	*new_tab(const char*);
140 static void		 usage(void);
141 
142 static struct { int meta, key; } thiskey;
143 
144 static WINDOW	*tabline, *body, *modeline, *minibuf;
145 static int	 body_lines, body_cols;
146 
147 static struct event	clminibufev;
148 static struct timeval	clminibufev_timer = { 5, 0 };
149 static struct timeval	loadingev_timer = { 0, 250000 };
150 
151 static uint32_t		 tab_counter;
152 
153 static char	keybuf[64];
154 
155 struct kmap global_map,
156 	minibuffer_map,
157 	*current_map,
158 	*base_map;
159 
160 static struct histhead eecmd_history,
161 	ir_history,
162 	lu_history;
163 
164 static int	in_minibuffer;
165 
166 static struct {
167 	char	*curmesg;
168 
169 	char	 buf[1025];
170 	size_t	 off, len;
171 	char	 prompt[32];
172 	void	 (*donefn)(void);
173 	void	 (*abortfn)(void);
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 tab *tab)
220 {
221 	struct vline *vl, *t;
222 
223 	tab->s.current_line = NULL;
224 	tab->s.line_max = 0;
225 
226 	TAILQ_FOREACH_SAFE(vl, &tab->s.head, vlines, t) {
227 		TAILQ_REMOVE(&tab->s.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 tab*))
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 tab*))
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-f",		cmd_mini_forward_char);
349 	minibuffer_set_key("C-b",		cmd_mini_backward_char);
350 	minibuffer_set_key("<right>",		cmd_mini_forward_char);
351 	minibuffer_set_key("<left>",		cmd_mini_backward_char);
352 	minibuffer_set_key("C-e",		cmd_mini_move_end_of_line);
353 	minibuffer_set_key("C-a",		cmd_mini_move_beginning_of_line);
354 	minibuffer_set_key("<end>",		cmd_mini_move_end_of_line);
355 	minibuffer_set_key("<home>",		cmd_mini_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 tab *tab)
366 {
367 	struct vline	*vl;
368 	const char	*prfx;
369 
370 	vl =tab->s.current_line;
371 	if (vl == NULL || vl->line == NULL)
372 		tab->s.curs_x = tab->s.line_x = 0;
373 	else
374 		tab->s.curs_x = utf8_snwidth(vl->line, tab->s.line_x);
375 
376 	if (vl != NULL) {
377 		prfx = line_prefixes[vl->parent->type].prfx1;
378 		tab->s.curs_x += utf8_swidth(prfx);
379 	}
380 }
381 
382 static void
383 cmd_previous_line(struct tab *tab)
384 {
385 	struct vline	*vl;
386 
387 	if (tab->s.current_line == NULL
388 	    || (vl = TAILQ_PREV(tab->s.current_line, vhead, vlines)) == NULL)
389 		return;
390 
391 	if (--tab->s.curs_y < 0) {
392 		tab->s.curs_y = 0;
393 		cmd_scroll_line_up(tab);
394 		return;
395 	}
396 
397 	tab->s.current_line = vl;
398 	restore_cursor(tab);
399 }
400 
401 static void
402 cmd_next_line(struct tab *tab)
403 {
404 	struct vline	*vl;
405 
406 	if (tab->s.current_line == NULL
407 	    || (vl = TAILQ_NEXT(tab->s.current_line, vlines)) == NULL)
408 		return;
409 
410 	if (++tab->s.curs_y > body_lines-1) {
411 		tab->s.curs_y = body_lines-1;
412 		cmd_scroll_line_down(tab);
413 		return;
414 	}
415 
416 	tab->s.current_line = vl;
417 	restore_cursor(tab);
418 }
419 
420 static void
421 cmd_backward_char(struct tab *tab)
422 {
423 	if (tab->s.line_x != 0)
424 		tab->s.line_x--;
425 	restore_cursor(tab);
426 }
427 
428 static void
429 cmd_forward_char(struct tab *tab)
430 {
431 	tab->s.line_x++;
432 	restore_cursor(tab);
433 }
434 
435 static void
436 cmd_backward_paragraph(struct tab *tab)
437 {
438 	do {
439 		if (tab->s.current_line == NULL ||
440 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
441 			message("No previous paragraph");
442 			return;
443 		}
444 		cmd_previous_line(tab);
445 	} while (tab->s.current_line->line != NULL ||
446 	    tab->s.current_line->parent->type != LINE_TEXT);
447 }
448 
449 static void
450 cmd_forward_paragraph(struct tab *tab)
451 {
452 	do {
453 		if (tab->s.current_line == NULL ||
454 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
455 			message("No next paragraph");
456 			return;
457 		}
458 		cmd_next_line(tab);
459 	} while (tab->s.current_line->line != NULL ||
460 	    tab->s.current_line->parent->type != LINE_TEXT);
461 }
462 
463 static void
464 cmd_move_beginning_of_line(struct tab *tab)
465 {
466 	tab->s.line_x = 0;
467 	restore_cursor(tab);
468 }
469 
470 static void
471 cmd_move_end_of_line(struct tab *tab)
472 {
473 	struct vline	*vl;
474 
475 	vl = tab->s.current_line;
476 	if (vl->line == NULL)
477 		return;
478 	tab->s.line_x = utf8_cplen(vl->line);
479 	restore_cursor(tab);
480 }
481 
482 static void
483 cmd_redraw(struct tab *tab)
484 {
485 	handle_resize(0, 0, NULL);
486 }
487 
488 static void
489 cmd_scroll_line_up(struct tab *tab)
490 {
491 	struct vline	*vl;
492 
493 	if (tab->s.line_off == 0)
494 		return;
495 
496 	vl = nth_line(tab, --tab->s.line_off);
497 	wscrl(body, -1);
498 	wmove(body, 0, 0);
499 	print_vline(vl);
500 
501 	tab->s.current_line = TAILQ_PREV(tab->s.current_line, vhead, vlines);
502 	restore_cursor(tab);
503 }
504 
505 static void
506 cmd_scroll_line_down(struct tab *tab)
507 {
508 	struct vline	*vl;
509 
510 	vl = tab->s.current_line;
511 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
512 		return;
513 	tab->s.current_line = vl;
514 
515 	tab->s.line_off++;
516 	wscrl(body, 1);
517 
518 	if (tab->s.line_max - tab->s.line_off < (size_t)body_lines)
519 		return;
520 
521 	vl = nth_line(tab, tab->s.line_off + body_lines-1);
522 	wmove(body, body_lines-1, 0);
523 	print_vline(vl);
524 
525 	restore_cursor(tab);
526 }
527 
528 static void
529 cmd_scroll_up(struct tab *tab)
530 {
531 	size_t off;
532 
533 	off = body_lines+1;
534 
535 	for (; off > 0; --off)
536 		cmd_scroll_line_up(tab);
537 }
538 
539 static void
540 cmd_scroll_down(struct tab *tab)
541 {
542 	size_t off;
543 
544 	off = body_lines+1;
545 
546 	for (; off > 0; --off)
547 		cmd_scroll_line_down(tab);
548 }
549 
550 static void
551 cmd_beginning_of_buffer(struct tab *tab)
552 {
553 	tab->s.current_line = TAILQ_FIRST(&tab->s.head);
554 	tab->s.line_off = 0;
555 	tab->s.curs_y = 0;
556 	tab->s.line_x = 0;
557 	restore_cursor(tab);
558 	redraw_body(tab);
559 }
560 
561 static void
562 cmd_end_of_buffer(struct tab *tab)
563 {
564 	ssize_t off;
565 
566 	off = tab->s.line_max - body_lines;
567 	off = MAX(0, off);
568 
569 	tab->s.line_off = off;
570 	tab->s.curs_y = MIN((size_t)body_lines, tab->s.line_max-1);
571 
572 	tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
573 	tab->s.line_x = body_cols;
574 	restore_cursor(tab);
575 	redraw_body(tab);
576 }
577 
578 static void
579 cmd_kill_telescope(struct tab *tab)
580 {
581 	event_loopbreak();
582 }
583 
584 static void
585 cmd_push_button(struct tab *tab)
586 {
587 	struct vline	*vl;
588 	size_t		 nth;
589 
590 	nth = tab->s.line_off + tab->s.curs_y;
591 	if (nth >= tab->s.line_max)
592 		return;
593 	vl = nth_line(tab, nth);
594 	if (vl->parent->type != LINE_LINK)
595 		return;
596 
597 	load_url_in_tab(tab, vl->parent->alt);
598 }
599 
600 static void
601 cmd_push_button_new_tab(struct tab *tab)
602 {
603 	struct vline	*vl;
604 	size_t		 nth;
605 
606 	nth = tab->s.line_off + tab->s.curs_y;
607 	if (nth > tab->s.line_max)
608 		return;
609 	vl = nth_line(tab, nth);
610 	if (vl->parent->type != LINE_LINK)
611 		return;
612 
613 	new_tab(vl->parent->alt);
614 }
615 
616 static void
617 cmd_previous_button(struct tab *tab)
618 {
619 	do {
620 		if (tab->s.current_line == NULL ||
621 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
622 			message("No previous link");
623 			return;
624 		}
625 		cmd_previous_line(tab);
626 	} while (tab->s.current_line->parent->type != LINE_LINK);
627 }
628 
629 static void
630 cmd_next_button(struct tab *tab)
631 {
632 	do {
633 		if (tab->s.current_line == NULL ||
634 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
635 			message("No next link");
636 			return;
637 		}
638 		cmd_next_line(tab);
639 	} while (tab->s.current_line->parent->type != LINE_LINK);
640 }
641 
642 static void
643 cmd_previous_page(struct tab *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 tab *tab)
653 {
654 	if (!load_next_page(tab))
655 		message("No next page");
656 	else
657 		start_loading_anim(tab);
658 }
659 
660 static void
661 cmd_clear_minibuf(struct tab *tab)
662 {
663 	handle_clear_minibuf(0, 0, NULL);
664 }
665 
666 static void
667 cmd_execute_extended_command(struct tab *tab)
668 {
669 	size_t	 len;
670 
671 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
672 	    &eecmd_history);
673 
674 	len = sizeof(ministate.prompt);
675 	strlcpy(ministate.prompt, "", len);
676 
677 	if (thiskey.meta)
678 		strlcat(ministate.prompt, "M-", len);
679 
680 	strlcat(ministate.prompt, keyname(thiskey.key), len);
681 	strlcat(ministate.prompt, " ", len);
682 }
683 
684 static void
685 cmd_tab_close(struct tab *tab)
686 {
687 	struct tab *t;
688 
689 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
690 	    TAILQ_NEXT(tab, tabs) == NULL) {
691 		message("Can't close the only tab.");
692 		return;
693 	}
694 
695 	if (evtimer_pending(&tab->s.loadingev, NULL))
696 		evtimer_del(&tab->s.loadingev);
697 
698 	stop_tab(tab);
699 
700 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
701 		t = TAILQ_NEXT(tab, tabs);
702 	TAILQ_REMOVE(&tabshead, tab, tabs);
703 	free(tab);
704 
705 	switch_to_tab(t);
706 }
707 
708 static void
709 cmd_tab_close_other(struct tab *tab)
710 {
711 	struct tab *t, *i;
712 
713 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
714 		if (t->flags & TAB_CURRENT)
715 			continue;
716 
717 		stop_tab(t);
718 		TAILQ_REMOVE(&tabshead, t, tabs);
719 		free(t);
720 	}
721 }
722 
723 static void
724 cmd_tab_new(struct tab *tab)
725 {
726 	new_tab(NEW_TAB_URL);
727 }
728 
729 static void
730 cmd_tab_next(struct tab *tab)
731 {
732 	struct tab *t;
733 
734 	tab->flags &= ~TAB_CURRENT;
735 
736 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
737 		t = TAILQ_FIRST(&tabshead);
738 	t->flags |= TAB_CURRENT;
739 }
740 
741 static void
742 cmd_tab_previous(struct tab *tab)
743 {
744 	struct tab *t;
745 
746 	tab->flags &= ~TAB_CURRENT;
747 
748 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
749 		t = TAILQ_LAST(&tabshead, tabshead);
750 	t->flags |= TAB_CURRENT;
751 }
752 
753 static void
754 cmd_load_url(struct tab *tab)
755 {
756 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
757 	    &lu_history);
758 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
759 }
760 
761 static void
762 cmd_load_current_url(struct tab *tab)
763 {
764 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
765 	    &lu_history);
766 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
767 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
768 	ministate.off = strlen(tab->hist_cur->h);
769 	ministate.len = ministate.off;
770 }
771 
772 static void
773 cmd_bookmark_page(struct tab *tab)
774 {
775 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
776 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
777 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
778 	ministate.off = strlen(tab->hist_cur->h);
779 	ministate.len = ministate.off;
780 }
781 
782 static void
783 cmd_goto_bookmarks(struct tab *tab)
784 {
785 	load_url_in_tab(tab, "about:bookmarks");
786 }
787 
788 static void
789 global_key_unbound(void)
790 {
791 	message("%s is undefined", keybuf);
792 }
793 
794 static void
795 cmd_mini_delete_char(struct tab *tab)
796 {
797 	minibuffer_taint_hist();
798 
799 	if (ministate.len == 0 || ministate.off == ministate.len)
800 		return;
801 
802 	memmove(&ministate.buf[ministate.off],
803 	    &ministate.buf[ministate.off+1],
804 	    ministate.len - ministate.off + 1);
805 	ministate.len--;
806 }
807 
808 static void
809 cmd_mini_delete_backward_char(struct tab *tab)
810 {
811 	minibuffer_taint_hist();
812 
813 	if (ministate.len == 0 || ministate.off == 0)
814 		return;
815 
816 	memmove(&ministate.buf[ministate.off-1],
817 	    &ministate.buf[ministate.off],
818 	    ministate.len - ministate.off + 1);
819 	ministate.off--;
820 	ministate.len--;
821 }
822 
823 static void
824 cmd_mini_forward_char(struct tab *tab)
825 {
826 	if (ministate.off == ministate.len)
827 		return;
828 	ministate.off++;
829 }
830 
831 static void
832 cmd_mini_backward_char(struct tab *tab)
833 {
834 	if (ministate.off == 0)
835 		return;
836 	ministate.off--;
837 }
838 
839 static void
840 cmd_mini_move_end_of_line(struct tab *tab)
841 {
842 	ministate.off = ministate.len;
843 }
844 
845 static void
846 cmd_mini_move_beginning_of_line(struct tab *tab)
847 {
848 	ministate.off = 0;
849 }
850 
851 static void
852 cmd_mini_kill_line(struct tab *tab)
853 {
854 	minibuffer_taint_hist();
855 
856         if (ministate.off == ministate.len)
857 		return;
858 	ministate.buf[ministate.off] = '\0';
859 	ministate.len -= ministate.off;
860 }
861 
862 static void
863 cmd_mini_abort(struct tab *tab)
864 {
865         ministate.abortfn();
866 }
867 
868 static void
869 cmd_mini_complete_and_exit(struct tab *tab)
870 {
871 	minibuffer_taint_hist();
872 	ministate.donefn();
873 }
874 
875 static void
876 cmd_mini_previous_history_element(struct tab *tab)
877 {
878 	if (ministate.history == NULL) {
879 		message("No history");
880 		return;
881 	}
882 
883 	if (ministate.hist_cur == NULL ||
884 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
885 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
886 		ministate.hist_off = ministate.history->len - 1;
887 		if (ministate.hist_cur == NULL)
888 			message("No prev item");
889 	} else {
890 		ministate.hist_off--;
891 	}
892 
893 	if (ministate.hist_cur != NULL) {
894 		ministate.off = 0;
895 		ministate.len = strlen(ministate.hist_cur->h);
896 	}
897 }
898 
899 static void
900 cmd_mini_next_history_element(struct tab *tab)
901 {
902 	if (ministate.history == NULL) {
903 		message("No history");
904 		return;
905 	}
906 
907 	if (ministate.hist_cur == NULL ||
908 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
909 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
910 		ministate.hist_off = 0;
911 		if (ministate.hist_cur == NULL)
912 			message("No next item");
913 	} else {
914 		ministate.hist_off++;
915 	}
916 
917 	if (ministate.hist_cur != NULL) {
918 		ministate.off = 0;
919 		ministate.len = strlen(ministate.hist_cur->h);
920 	}
921 }
922 
923 static void
924 minibuffer_hist_save_entry(void)
925 {
926 	struct hist	*hist;
927 
928 	if (ministate.history == NULL)
929 		return;
930 
931 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
932 		abort();
933 
934 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
935 
936 	if (TAILQ_EMPTY(&ministate.history->head))
937 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
938 	else
939 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
940 	ministate.history->len++;
941 }
942 
943 /*
944  * taint the minibuffer cache: if we're currently showing a history
945  * element, copy that to the current buf and reset the "history
946  * navigation" thing.
947  */
948 static void
949 minibuffer_taint_hist(void)
950 {
951 	if (ministate.hist_cur == NULL)
952 		return;
953 
954 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
955 	ministate.hist_cur = NULL;
956 }
957 
958 static void
959 minibuffer_self_insert(void)
960 {
961 	minibuffer_taint_hist();
962 
963 	if (ministate.len == sizeof(ministate.buf) -1)
964 		return;
965 
966 	/* TODO: utf8 handling! */
967 
968 	memmove(&ministate.buf[ministate.off+1],
969 	    &ministate.buf[ministate.off],
970 	    ministate.len - ministate.off + 1);
971 	ministate.buf[ministate.off] = thiskey.key;
972 	ministate.off++;
973 	ministate.len++;
974 }
975 
976 static void
977 eecmd_self_insert(void)
978 {
979 	if (thiskey.meta || isspace(thiskey.key) ||
980 	    !isgraph(thiskey.key)) {
981 		global_key_unbound();
982 		return;
983 	}
984 
985 	minibuffer_self_insert();
986 }
987 
988 static void
989 eecmd_select(void)
990 {
991 	exit_minibuffer();
992 	minibuffer_hist_save_entry();
993 	message("TODO: try to execute %s", ministate.buf);
994 }
995 
996 static void
997 ir_self_insert(void)
998 {
999 	minibuffer_self_insert();
1000 }
1001 
1002 static void
1003 ir_select(void)
1004 {
1005 	char		 buf[1025] = {0};
1006 	struct url	 url;
1007 	struct tab	*tab;
1008 
1009 	tab = current_tab();
1010 
1011 	exit_minibuffer();
1012 	minibuffer_hist_save_entry();
1013 
1014 	/* a bit ugly but... */
1015 	memcpy(&url, &tab->url, sizeof(tab->url));
1016 	url_set_query(&url, ministate.buf);
1017 	url_unparse(&url, buf, sizeof(buf));
1018 	load_url_in_tab(tab, buf);
1019 }
1020 
1021 static void
1022 lu_self_insert(void)
1023 {
1024 	if (thiskey.meta || isspace(thiskey.key) ||
1025 	    !isgraph(thiskey.key)) {
1026 		global_key_unbound();
1027 		return;
1028 	}
1029 
1030 	minibuffer_self_insert();
1031 }
1032 
1033 static void
1034 lu_select(void)
1035 {
1036 	exit_minibuffer();
1037 	minibuffer_hist_save_entry();
1038 	load_url_in_tab(current_tab(), ministate.buf);
1039 }
1040 
1041 static void
1042 bp_select(void)
1043 {
1044 	exit_minibuffer();
1045 	if (*ministate.buf != '\0')
1046 		add_to_bookmarks(ministate.buf);
1047 	else
1048 		message("Abort.");
1049 }
1050 
1051 static struct vline *
1052 nth_line(struct tab *tab, size_t n)
1053 {
1054 	struct vline	*vl;
1055 	size_t		 i;
1056 
1057 	i = 0;
1058 	TAILQ_FOREACH(vl, &tab->s.head, vlines) {
1059 		if (i == n)
1060 			return vl;
1061 		i++;
1062 	}
1063 
1064 	/* unreachable */
1065 	abort();
1066 }
1067 
1068 static struct tab *
1069 current_tab(void)
1070 {
1071 	struct tab *t;
1072 
1073 	TAILQ_FOREACH(t, &tabshead, tabs) {
1074 		if (t->flags & TAB_CURRENT)
1075 			return t;
1076 	}
1077 
1078 	/* unreachable */
1079 	abort();
1080 }
1081 
1082 static void
1083 dispatch_stdio(int fd, short ev, void *d)
1084 {
1085 	struct keymap	*k;
1086 	const char	*keyname;
1087 	char		 tmp[2] = {0};
1088 
1089 	thiskey.key = wgetch(body);
1090 	if (thiskey.key == ERR)
1091 		return;
1092 	if (thiskey.key == 27) {
1093 		/* TODO: make escape-time customizable */
1094 
1095 		thiskey.meta = 1;
1096 		thiskey.key = wgetch(body);
1097 		if (thiskey.key == ERR || thiskey.key == 27) {
1098 			thiskey.meta = 0;
1099 			thiskey.key = 27;
1100 		}
1101 	} else
1102 		thiskey.meta = 0;
1103 
1104 	if (keybuf[0] != '\0')
1105 		strlcat(keybuf, " ", sizeof(keybuf));
1106 	if (thiskey.meta)
1107 		strlcat(keybuf, "M-", sizeof(keybuf));
1108 	if ((keyname = unkbd(thiskey.key)) != NULL)
1109 		strlcat(keybuf, keyname, sizeof(keybuf));
1110 	else {
1111 		tmp[0] = thiskey.key;
1112 		strlcat(keybuf, tmp, sizeof(keybuf));
1113 	}
1114 
1115 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1116 		if (k->meta == thiskey.meta &&
1117 		    k->key == thiskey.key) {
1118 			if (k->fn == NULL)
1119 				current_map = &k->map;
1120 			else {
1121 				current_map = base_map;
1122 				strlcpy(keybuf, "", sizeof(keybuf));
1123 				k->fn(current_tab());
1124 			}
1125 			goto done;
1126 		}
1127 	}
1128 
1129 	if (current_map->unhandled_input != NULL)
1130 		current_map->unhandled_input();
1131 	else {
1132 		global_key_unbound();
1133 	}
1134 
1135 	strlcpy(keybuf, "", sizeof(keybuf));
1136 	current_map = base_map;
1137 
1138 done:
1139 	redraw_tab(current_tab());
1140 }
1141 
1142 static void
1143 handle_clear_minibuf(int fd, short ev, void *d)
1144 {
1145 	free(ministate.curmesg);
1146 	ministate.curmesg = NULL;
1147 
1148 	redraw_minibuffer();
1149 	if (in_minibuffer) {
1150 		wrefresh(body);
1151 		wrefresh(minibuf);
1152 	} else {
1153 		wrefresh(minibuf);
1154 		wrefresh(body);
1155 	}
1156 }
1157 
1158 static void
1159 handle_resize(int sig, short ev, void *d)
1160 {
1161 	struct tab	*tab;
1162 
1163 	endwin();
1164 	refresh();
1165 	clear();
1166 
1167 	/* move and resize the windows, in reverse order! */
1168 
1169 	mvwin(minibuf, LINES-1, 0);
1170 	wresize(minibuf, 1, COLS);
1171 
1172 	mvwin(modeline, LINES-2, 0);
1173 	wresize(modeline, 1, COLS);
1174 
1175 	wresize(body, LINES-3, COLS);
1176 	body_lines = LINES-3;
1177 	body_cols = COLS;
1178 
1179 	wresize(tabline, 1, COLS);
1180 
1181 	tab = current_tab();
1182 
1183 	wrap_page(tab);
1184 	redraw_tab(tab);
1185 }
1186 
1187 static int
1188 wrap_page(struct tab *tab)
1189 {
1190 	struct line		*l;
1191 	const struct line	*orig;
1192 	struct vline		*vl;
1193 	const char		*prfx;
1194 
1195 	orig = tab->s.current_line == NULL
1196 		? NULL
1197 		: tab->s.current_line->parent;
1198 	tab->s.current_line = NULL;
1199 
1200 	tab->s.curs_y = 0;
1201 	tab->s.line_off = 0;
1202 
1203 	empty_vlist(tab);
1204 
1205 	TAILQ_FOREACH(l, &tab->page.head, lines) {
1206 		prfx = line_prefixes[l->type].prfx1;
1207 		switch (l->type) {
1208 		case LINE_TEXT:
1209 		case LINE_LINK:
1210 		case LINE_TITLE_1:
1211 		case LINE_TITLE_2:
1212 		case LINE_TITLE_3:
1213 		case LINE_ITEM:
1214 		case LINE_QUOTE:
1215 		case LINE_PRE_START:
1216 		case LINE_PRE_END:
1217 			wrap_text(tab, prfx, l, body_cols);
1218 			break;
1219 		case LINE_PRE_CONTENT:
1220                         hardwrap_text(tab, l, body_cols);
1221 			break;
1222 		}
1223 
1224 		if (orig == l && tab->s.current_line == NULL) {
1225 			tab->s.line_off = tab->s.line_max-1;
1226 			tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
1227 
1228 			while (1) {
1229 				vl = TAILQ_PREV(tab->s.current_line, vhead, vlines);
1230 				if (vl == NULL || vl->parent != orig)
1231 					break;
1232 				tab->s.current_line = vl;
1233 				tab->s.line_off--;
1234 			}
1235 		}
1236 	}
1237 
1238         if (tab->s.current_line == NULL)
1239 		tab->s.current_line = TAILQ_FIRST(&tab->s.head);
1240 
1241 	return 1;
1242 }
1243 
1244 static void
1245 print_vline(struct vline *vl)
1246 {
1247 	const char *text = vl->line;
1248 	const char *prfx;
1249 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1250 	int text_face = line_faces[vl->parent->type].text_prop;
1251 
1252 	if (!vl->flags)
1253 		prfx = line_prefixes[vl->parent->type].prfx1;
1254 	else
1255 		prfx = line_prefixes[vl->parent->type].prfx2;
1256 
1257 	if (text == NULL)
1258 		text = "";
1259 
1260 	wattron(body, prefix_face);
1261 	wprintw(body, "%s", prfx);
1262 	wattroff(body, prefix_face);
1263 
1264 	wattron(body, text_face);
1265 	wprintw(body, "%s", text);
1266 	wattroff(body, text_face);
1267 }
1268 
1269 static void
1270 redraw_tabline(void)
1271 {
1272 	struct tab	*tab;
1273 	size_t		 toskip;
1274 	int		 current, x, y, truncated;
1275 	const char	*title;
1276 	char		 buf[25];
1277 
1278 	toskip = 0;
1279 	x = 1;
1280 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1281 		x += sizeof(buf) + 1;
1282 		toskip++;
1283 		if (tab->flags & TAB_CURRENT)
1284 			break;
1285 	}
1286 	if (x < COLS-2)
1287 		toskip = 0;
1288 	else
1289 		toskip--;
1290 
1291 	werase(tabline);
1292 	wattron(tabline, tab_face.background);
1293 	wprintw(tabline, toskip == 0 ? " " : "<");
1294 	wattroff(tabline, tab_face.background);
1295 
1296 	truncated = 0;
1297 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1298 		if (truncated)
1299 			break;
1300 		if (toskip != 0) {
1301 			toskip--;
1302 			continue;
1303 		}
1304 
1305 		getyx(tabline, y, x);
1306 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1307 			truncated = 1;
1308 
1309 		current = tab->flags & TAB_CURRENT;
1310 
1311 		if (*(title = tab->page.title) == '\0')
1312 			title = tab->hist_cur->h;
1313 
1314 		strlcpy(buf, " ", sizeof(buf));
1315                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1316 			/* truncation happens */
1317 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1318 		} else {
1319 			/* pad with spaces */
1320 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1321 				/* nop */ ;
1322 		}
1323 
1324 		if (current)
1325 			wattron(tabline, tab_face.current_tab);
1326 		else
1327 			wattron(tabline, tab_face.tab);
1328 
1329 		wprintw(tabline, "%s", buf);
1330 		if (TAILQ_NEXT(tab, tabs) != NULL)
1331 			wprintw(tabline, " ");
1332 
1333 		if (current)
1334 			wattroff(tabline, tab_face.current_tab);
1335 		else
1336 			wattroff(tabline, tab_face.tab);
1337 	}
1338 
1339 	wattron(tabline, tab_face.background);
1340 	for (; x < COLS; ++x)
1341 		waddch(tabline, ' ');
1342 	if (truncated)
1343 		mvwprintw(tabline, 0, COLS-1, ">");
1344 }
1345 
1346 static inline char
1347 trust_status_char(enum trust_state ts)
1348 {
1349 	switch (ts) {
1350 	case TS_UNKNOWN:	return 'u';
1351 	case TS_UNTRUSTED:	return '!';
1352 	case TS_TRUSTED:	return 'v';
1353 	case TS_VERIFIED:	return 'V';
1354 	}
1355 }
1356 
1357 static void
1358 redraw_modeline(struct tab *tab)
1359 {
1360 	double		 pct;
1361 	int		 x, y, max_x, max_y;
1362 	const char	*mode = tab->page.name;
1363 	const char	*spin = "-\\|/";
1364 
1365 	werase(modeline);
1366 	wattron(modeline, A_REVERSE);
1367 	wmove(modeline, 0, 0);
1368 
1369 	wprintw(modeline, "-%c%c %s ",
1370 	    spin[tab->s.loading_anim_step],
1371 	    trust_status_char(tab->trust),
1372 	    mode == NULL ? "(none)" : mode);
1373 
1374 	pct = (tab->s.line_off + tab->s.curs_y) * 100.0 / tab->s.line_max;
1375 
1376 	if (tab->s.line_max <= (size_t)body_lines)
1377                 wprintw(modeline, "All ");
1378 	else if (tab->s.line_off == 0)
1379                 wprintw(modeline, "Top ");
1380 	else if (tab->s.line_off + body_lines >= tab->s.line_max)
1381 		wprintw(modeline, "Bottom ");
1382 	else
1383 		wprintw(modeline, "%.0f%% ", pct);
1384 
1385 	wprintw(modeline, "%d/%d %s ",
1386 	    tab->s.line_off + tab->s.curs_y,
1387 	    tab->s.line_max,
1388 	    tab->hist_cur->h);
1389 
1390 	getyx(modeline, y, x);
1391 	getmaxyx(modeline, max_y, max_x);
1392 
1393 	(void)y;
1394 	(void)max_y;
1395 
1396 	for (; x < max_x; ++x)
1397 		waddstr(modeline, "-");
1398 }
1399 
1400 static void
1401 redraw_minibuffer(void)
1402 {
1403 	size_t skip = 0, off_x = 0, off_y = 0;
1404 	struct tab *tab;
1405 
1406 	werase(minibuf);
1407 	if (in_minibuffer) {
1408 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1409 		if (ministate.hist_cur != NULL)
1410 			wprintw(minibuf, "(%zu/%zu) ",
1411 			    ministate.hist_off + 1,
1412 			    ministate.history->len);
1413 
1414 		getyx(minibuf, off_y, off_x);
1415 
1416 		while (ministate.off - skip > (size_t)COLS / 2) {
1417 			skip += MIN(ministate.off/4, 1);
1418 		}
1419 
1420 		if (ministate.hist_cur != NULL)
1421 			wprintw(minibuf, "%s", ministate.hist_cur->h + skip);
1422 		else
1423 			wprintw(minibuf, "%s", ministate.buf + skip);
1424 	}
1425 
1426 	if (ministate.curmesg != NULL) {
1427 		if (in_minibuffer)
1428 			wprintw(minibuf, "  [%s]", ministate.curmesg);
1429 		else
1430 			wprintw(minibuf, "%s", ministate.curmesg);
1431 	}
1432 
1433 	if (!in_minibuffer && ministate.curmesg == NULL)
1434 		wprintw(minibuf, "%s", keybuf);
1435 
1436 	/* If nothing else, show the URL at point */
1437 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1438 		tab = current_tab();
1439 		if (tab->s.current_line != NULL &&
1440 		    tab->s.current_line->parent->type == LINE_LINK)
1441 			wprintw(minibuf, "%s",
1442 			    tab->s.current_line->parent->alt);
1443 	}
1444 
1445 	if (in_minibuffer)
1446 		wmove(minibuf, 0, off_x + ministate.off - skip);
1447 }
1448 
1449 static void
1450 redraw_tab(struct tab *tab)
1451 {
1452 	redraw_tabline();
1453 	redraw_body(tab);
1454 	redraw_modeline(tab);
1455 	redraw_minibuffer();
1456 
1457 	wrefresh(tabline);
1458 	wrefresh(modeline);
1459 
1460 	if (in_minibuffer) {
1461 		wrefresh(body);
1462 		wrefresh(minibuf);
1463 	} else {
1464 		wrefresh(minibuf);
1465 		wrefresh(body);
1466 	}
1467 }
1468 
1469 static void
1470 redraw_body(struct tab *tab)
1471 {
1472 	struct vline	*vl;
1473 	int		 line;
1474 
1475 	werase(body);
1476 
1477 	tab->s.line_off = MIN(tab->s.line_max-1, tab->s.line_off);
1478 	if (TAILQ_EMPTY(&tab->s.head))
1479 		return;
1480 
1481 	line = 0;
1482 	vl = nth_line(tab, tab->s.line_off);
1483 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1484 		wmove(body, line, 0);
1485 		print_vline(vl);
1486 		line++;
1487 		if (line == body_lines)
1488 			break;
1489 	}
1490 
1491 	wmove(body, tab->s.curs_y, tab->s.curs_x);
1492 }
1493 
1494 static void
1495 vmessage(const char *fmt, va_list ap)
1496 {
1497 	if (evtimer_pending(&clminibufev, NULL))
1498 		evtimer_del(&clminibufev);
1499 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1500 	evtimer_add(&clminibufev, &clminibufev_timer);
1501 
1502 	free(ministate.curmesg);
1503 
1504 	/* TODO: what to do if the allocation fails here? */
1505 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1506 		ministate.curmesg = NULL;
1507 
1508 	redraw_minibuffer();
1509 	if (in_minibuffer) {
1510 		wrefresh(body);
1511 		wrefresh(minibuf);
1512 	} else {
1513 		wrefresh(minibuf);
1514 		wrefresh(body);
1515 	}
1516 }
1517 
1518 static void
1519 message(const char *fmt, ...)
1520 {
1521 	va_list ap;
1522 
1523 	va_start(ap, fmt);
1524 	vmessage(fmt, ap);
1525 	va_end(ap);
1526 }
1527 
1528 static void
1529 start_loading_anim(struct tab *tab)
1530 {
1531 	if (tab->s.loading_anim)
1532 		return;
1533 	tab->s.loading_anim = 1;
1534 	evtimer_set(&tab->s.loadingev, update_loading_anim, tab);
1535 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1536 }
1537 
1538 static void
1539 update_loading_anim(int fd, short ev, void *d)
1540 {
1541 	struct tab	*tab = d;
1542 
1543 	tab->s.loading_anim_step = (tab->s.loading_anim_step+1)%4;
1544 
1545 	if (tab->flags & TAB_CURRENT) {
1546 		redraw_modeline(tab);
1547 		wrefresh(modeline);
1548 		wrefresh(body);
1549 		if (in_minibuffer)
1550 			wrefresh(minibuf);
1551 	}
1552 
1553 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1554 }
1555 
1556 static void
1557 stop_loading_anim(struct tab *tab)
1558 {
1559 	if (!tab->s.loading_anim)
1560 		return;
1561 	evtimer_del(&tab->s.loadingev);
1562 	tab->s.loading_anim = 0;
1563 	tab->s.loading_anim_step = 0;
1564 
1565 	if (!(tab->flags & TAB_CURRENT))
1566 		return;
1567 
1568 	redraw_modeline(tab);
1569 
1570 	wrefresh(modeline);
1571 	wrefresh(body);
1572 	if (in_minibuffer)
1573 		wrefresh(minibuf);
1574 }
1575 
1576 static void
1577 load_url_in_tab(struct tab *tab, const char *url)
1578 {
1579 	empty_vlist(tab);
1580 	message("Loading %s...", url);
1581 	start_loading_anim(tab);
1582 	load_url(tab, url);
1583 
1584 	tab->s.curs_x = 0;
1585 	tab->s.curs_y = 0;
1586 	redraw_tab(tab);
1587 }
1588 
1589 static void
1590 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1591     void (*abortfn)(void), struct histhead *hist)
1592 {
1593 	in_minibuffer = 1;
1594 	base_map = &minibuffer_map;
1595 	current_map = &minibuffer_map;
1596 
1597 	base_map->unhandled_input = self_insert_fn;
1598 
1599 	ministate.donefn = donefn;
1600 	ministate.abortfn = abortfn;
1601 	memset(ministate.buf, 0, sizeof(ministate.buf));
1602         ministate.off = 0;
1603 	ministate.len = 0;
1604 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1605 
1606 	ministate.history = hist;
1607 	ministate.hist_cur = NULL;
1608 	ministate.hist_off = 0;
1609 }
1610 
1611 static void
1612 exit_minibuffer(void)
1613 {
1614 	werase(minibuf);
1615 
1616 	in_minibuffer = 0;
1617 	base_map = &global_map;
1618 	current_map = &global_map;
1619 }
1620 
1621 static void
1622 switch_to_tab(struct tab *tab)
1623 {
1624 	struct tab	*t;
1625 
1626 	TAILQ_FOREACH(t, &tabshead, tabs) {
1627 		t->flags &= ~TAB_CURRENT;
1628 	}
1629 
1630 	tab->flags |= TAB_CURRENT;
1631 }
1632 
1633 static struct tab *
1634 new_tab(const char *url)
1635 {
1636 	struct tab	*tab;
1637 
1638 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1639 		event_loopbreak();
1640 		return NULL;
1641 	}
1642 
1643 	TAILQ_INIT(&tab->hist.head);
1644 
1645 	TAILQ_INIT(&tab->s.head);
1646 
1647 	tab->id = tab_counter++;
1648 	switch_to_tab(tab);
1649 
1650 	if (TAILQ_EMPTY(&tabshead))
1651 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1652 	else
1653 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1654 
1655 	load_url_in_tab(tab, url);
1656 	return tab;
1657 }
1658 
1659 static void
1660 usage(void)
1661 {
1662 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1663 }
1664 
1665 int
1666 ui_init(int argc, char * const *argv)
1667 {
1668 	const char *url = NEW_TAB_URL;
1669 	int ch;
1670 
1671 	while ((ch = getopt(argc, argv, "")) != -1) {
1672 		switch (ch) {
1673 		default:
1674 			usage();
1675 			return 0;
1676 		}
1677 	}
1678 	argc -= optind;
1679 	argv += optind;
1680 
1681 	if (argc != 0)
1682 		url = argv[0];
1683 
1684 	setlocale(LC_ALL, "");
1685 
1686 	TAILQ_INIT(&global_map.m);
1687 	global_map.unhandled_input = global_key_unbound;
1688 
1689 	TAILQ_INIT(&minibuffer_map.m);
1690 
1691 	TAILQ_INIT(&eecmd_history.head);
1692 	TAILQ_INIT(&ir_history.head);
1693 	TAILQ_INIT(&lu_history.head);
1694 
1695 	base_map = &global_map;
1696 	current_map = &global_map;
1697 	load_default_keys();
1698 
1699 	initscr();
1700 	raw();
1701 	noecho();
1702 
1703 	nonl();
1704 	intrflush(stdscr, FALSE);
1705 
1706 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1707 		return 0;
1708 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1709 		return 0;
1710 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1711 		return 0;
1712 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1713 		return 0;
1714 
1715 	body_lines = LINES-3;
1716 	body_cols = COLS;
1717 
1718 	keypad(body, TRUE);
1719 	scrollok(body, TRUE);
1720 
1721 	/* non-blocking input */
1722 	wtimeout(body, 0);
1723 
1724 	mvwprintw(body, 0, 0, "");
1725 
1726 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1727 	event_add(&stdioev, NULL);
1728 
1729 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1730 	signal_add(&winchev, NULL);
1731 
1732 	new_tab(url);
1733 
1734 	return 1;
1735 }
1736 
1737 void
1738 ui_on_tab_loaded(struct tab *tab)
1739 {
1740 	stop_loading_anim(tab);
1741 	message("Loaded %s", tab->hist_cur->h);
1742 
1743 	redraw_tabline();
1744 	wrefresh(tabline);
1745 	if (in_minibuffer)
1746 		wrefresh(minibuf);
1747 	else
1748 		wrefresh(body);
1749 }
1750 
1751 void
1752 ui_on_tab_refresh(struct tab *tab)
1753 {
1754 	wrap_page(tab);
1755 	if (tab->flags & TAB_CURRENT)
1756 		redraw_tab(tab);
1757 }
1758 
1759 void
1760 ui_require_input(struct tab *tab, int hide)
1761 {
1762 	/* TODO: hard-switching to another tab is ugly */
1763 	switch_to_tab(tab);
1764 
1765 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1766 	    &ir_history);
1767 	strlcpy(ministate.prompt, "Input required: ",
1768 	    sizeof(ministate.prompt));
1769 	redraw_tab(tab);
1770 }
1771 
1772 void
1773 ui_notify(const char *fmt, ...)
1774 {
1775 	va_list ap;
1776 
1777 	va_start(ap, fmt);
1778 	vmessage(fmt, ap);
1779 	va_end(ap);
1780 }
1781 
1782 void
1783 ui_end(void)
1784 {
1785 	endwin();
1786 }