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Date:: Sun Mar 21 16:19:01 2021 UTC
Message:: UTF8 input for the minibuffer!
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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 tab*);
56 static void		 restore_cursor(struct tab *);
57 
58 static void		 cmd_previous_line(struct tab*);
59 static void		 cmd_next_line(struct tab*);
60 static void		 cmd_backward_char(struct tab*);
61 static void		 cmd_forward_char(struct tab*);
62 static void		 cmd_backward_paragraph(struct tab*);
63 static void		 cmd_forward_paragraph(struct tab*);
64 static void		 cmd_move_beginning_of_line(struct tab*);
65 static void		 cmd_move_end_of_line(struct tab*);
66 static void		 cmd_redraw(struct tab*);
67 static void		 cmd_scroll_line_down(struct tab*);
68 static void		 cmd_scroll_line_up(struct tab*);
69 static void		 cmd_scroll_up(struct tab*);
70 static void		 cmd_scroll_down(struct tab*);
71 static void		 cmd_beginning_of_buffer(struct tab*);
72 static void		 cmd_end_of_buffer(struct tab*);
73 static void		 cmd_kill_telescope(struct tab*);
74 static void		 cmd_push_button(struct tab*);
75 static void		 cmd_push_button_new_tab(struct tab*);
76 static void		 cmd_previous_button(struct tab*);
77 static void		 cmd_next_button(struct tab*);
78 static void		 cmd_previous_page(struct tab*);
79 static void		 cmd_next_page(struct tab*);
80 static void		 cmd_clear_minibuf(struct tab*);
81 static void		 cmd_execute_extended_command(struct tab*);
82 static void		 cmd_tab_close(struct tab*);
83 static void		 cmd_tab_close_other(struct tab*);
84 static void		 cmd_tab_new(struct tab*);
85 static void		 cmd_tab_next(struct tab*);
86 static void		 cmd_tab_previous(struct tab*);
87 static void		 cmd_load_url(struct tab*);
88 static void		 cmd_load_current_url(struct tab*);
89 static void		 cmd_bookmark_page(struct tab*);
90 static void		 cmd_goto_bookmarks(struct tab*);
91 
92 static void		 global_key_unbound(void);
93 
94 static void		 cmd_mini_delete_char(struct tab*);
95 static void		 cmd_mini_delete_backward_char(struct tab*);
96 static void		 cmd_mini_forward_char(struct tab*);
97 static void		 cmd_mini_backward_char(struct tab*);
98 static void		 cmd_mini_move_end_of_line(struct tab*);
99 static void		 cmd_mini_move_beginning_of_line(struct tab*);
100 static void		 cmd_mini_kill_line(struct tab*);
101 static void		 cmd_mini_abort(struct tab*);
102 static void		 cmd_mini_complete_and_exit(struct tab*);
103 static void		 cmd_mini_previous_history_element(struct tab*);
104 static void		 cmd_mini_next_history_element(struct tab*);
105 
106 static void		 minibuffer_hist_save_entry(void);
107 static void		 minibuffer_taint_hist(void);
108 static void		 minibuffer_self_insert(void);
109 static void		 eecmd_self_insert(void);
110 static void		 eecmd_select(void);
111 static void		 ir_self_insert(void);
112 static void		 ir_select(void);
113 static void		 lu_self_insert(void);
114 static void		 lu_select(void);
115 static void		 bp_select(void);
116 
117 static struct vline	*nth_line(struct tab*, size_t);
118 static struct tab	*current_tab(void);
119 static int		 readkey(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 { short meta; int key; uint32_t cp; } 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 	char	*curs;
171 	size_t	 cpoff;
172 	char	 prompt[32];
173 	void	 (*donefn)(void);
174 	void	 (*abortfn)(void);
175 
176 	struct histhead	*history;
177 	struct hist	*hist_cur;
178 	size_t		 hist_off;
179 } ministate;
180 
181 struct lineprefix {
182 	const char	*prfx1;
183 	const char	*prfx2;
184 } line_prefixes[] = {
185 	[LINE_TEXT] =		{ "",		"" },
186 	[LINE_LINK] =		{ "=> ",	"   " },
187 	[LINE_TITLE_1] =	{ "# ",		"  " },
188 	[LINE_TITLE_2] =	{ "## ",	"   " },
189 	[LINE_TITLE_3] =	{ "### ",	"    " },
190 	[LINE_ITEM] =		{ "* ",		"  " },
191 	[LINE_QUOTE] =		{ "> ",		"  " },
192 	[LINE_PRE_START] =	{ "```",	"   " },
193 	[LINE_PRE_CONTENT] =	{ "",		"" },
194 	[LINE_PRE_END] =	{ "```",	"```" },
195 };
196 
197 static struct line_face {
198 	int prefix_prop;
199 	int text_prop;
200 } line_faces[] = {
201 	[LINE_TEXT] =		{ 0,		0 },
202 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
203 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
204 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
205 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
206 	[LINE_ITEM] =		{ 0,		0 },
207 	[LINE_QUOTE] =		{ 0,		A_DIM },
208 	[LINE_PRE_START] =	{ 0,		0 },
209 	[LINE_PRE_CONTENT] =	{ 0,		0 },
210 	[LINE_PRE_END] =	{ 0,		0 },
211 };
212 
213 static struct tab_face {
214 	int background, tab, current_tab;
215 } tab_face = {
216 	A_REVERSE, A_REVERSE, A_NORMAL
217 };
218 
219 static void
220 empty_vlist(struct tab *tab)
221 {
222 	struct vline *vl, *t;
223 
224 	tab->s.current_line = NULL;
225 	tab->s.line_max = 0;
226 
227 	TAILQ_FOREACH_SAFE(vl, &tab->s.head, vlines, t) {
228 		TAILQ_REMOVE(&tab->s.head, vl, vlines);
229 		free(vl->line);
230 		free(vl);
231 	}
232 }
233 
234 static inline void
235 global_set_key(const char *key, void (*fn)(struct tab*))
236 {
237 	if (!kmap_define_key(&global_map, key, fn))
238 		_exit(1);
239 }
240 
241 static inline void
242 minibuffer_set_key(const char *key, void (*fn)(struct tab*))
243 {
244 	if (!kmap_define_key(&minibuffer_map, key, fn))
245 		_exit(1);
246 }
247 
248 static void
249 load_default_keys(void)
250 {
251 	/* === global map === */
252 
253 	/* emacs */
254 	global_set_key("C-p",		cmd_previous_line);
255 	global_set_key("C-n",		cmd_next_line);
256 	global_set_key("C-f",		cmd_forward_char);
257 	global_set_key("C-b",		cmd_backward_char);
258 	global_set_key("M-{",		cmd_backward_paragraph);
259 	global_set_key("M-}",		cmd_forward_paragraph);
260 	global_set_key("C-a",		cmd_move_beginning_of_line);
261 	global_set_key("C-e",		cmd_move_end_of_line);
262 
263 	global_set_key("M-v",		cmd_scroll_up);
264 	global_set_key("C-v",		cmd_scroll_down);
265 	global_set_key("M-space",	cmd_scroll_up);
266 	global_set_key("space",		cmd_scroll_down);
267 
268 	global_set_key("C-x C-c",	cmd_kill_telescope);
269 
270 	global_set_key("C-g",		cmd_clear_minibuf);
271 
272 	global_set_key("M-x",		cmd_execute_extended_command);
273 	global_set_key("C-x C-f",	cmd_load_url);
274 	global_set_key("C-x M-f",	cmd_load_current_url);
275 
276 	global_set_key("C-x t 0",	cmd_tab_close);
277 	global_set_key("C-x t 1",	cmd_tab_close_other);
278 	global_set_key("C-x t 2",	cmd_tab_new);
279 	global_set_key("C-x t o",	cmd_tab_next);
280 	global_set_key("C-x t O",	cmd_tab_previous);
281 
282 	global_set_key("M-<",		cmd_beginning_of_buffer);
283 	global_set_key("M->",		cmd_end_of_buffer);
284 
285 	global_set_key("C-M-b",		cmd_previous_page);
286 	global_set_key("C-M-f",		cmd_next_page);
287 
288 	global_set_key("<f7> a",	cmd_bookmark_page);
289 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
290 
291 	/* vi/vi-like */
292 	global_set_key("k",		cmd_previous_line);
293 	global_set_key("j",		cmd_next_line);
294 	global_set_key("l",		cmd_forward_char);
295 	global_set_key("h",		cmd_backward_char);
296 	global_set_key("{",		cmd_backward_paragraph);
297 	global_set_key("}",		cmd_forward_paragraph);
298 	global_set_key("^",		cmd_move_beginning_of_line);
299 	global_set_key("$",		cmd_move_end_of_line);
300 
301 	global_set_key("K",		cmd_scroll_line_up);
302 	global_set_key("J",		cmd_scroll_line_down);
303 
304 	global_set_key("g D",		cmd_tab_close);
305 	global_set_key("g N",		cmd_tab_new);
306 	global_set_key("g t",		cmd_tab_next);
307 	global_set_key("g T",		cmd_tab_previous);
308 
309 	global_set_key("g g",		cmd_beginning_of_buffer);
310 	global_set_key("G",		cmd_end_of_buffer);
311 
312 	global_set_key("H",		cmd_previous_page);
313 	global_set_key("L",		cmd_next_page);
314 
315 	/* tmp */
316 	global_set_key("q",		cmd_kill_telescope);
317 
318 	global_set_key("esc",		cmd_clear_minibuf);
319 
320 	global_set_key(":",		cmd_execute_extended_command);
321 
322 	/* cua */
323 	global_set_key("<up>",		cmd_previous_line);
324 	global_set_key("<down>",	cmd_next_line);
325 	global_set_key("<right>",	cmd_forward_char);
326 	global_set_key("<left>",	cmd_backward_char);
327 	global_set_key("<prior>",	cmd_scroll_up);
328 	global_set_key("<next>",	cmd_scroll_down);
329 
330 	global_set_key("M-<left>",	cmd_previous_page);
331 	global_set_key("M-<right>",	cmd_next_page);
332 
333 	/* "ncurses standard" */
334 	global_set_key("C-l",		cmd_redraw);
335 
336 	/* global */
337 	global_set_key("C-m",		cmd_push_button);
338 	global_set_key("M-enter",	cmd_push_button_new_tab);
339 	global_set_key("M-tab",		cmd_previous_button);
340 	global_set_key("tab",		cmd_next_button);
341 
342 	/* === minibuffer map === */
343 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
344 	minibuffer_set_key("C-g",		cmd_mini_abort);
345 	minibuffer_set_key("esc",		cmd_mini_abort);
346 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
347 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
348 
349 	minibuffer_set_key("C-f",		cmd_mini_forward_char);
350 	minibuffer_set_key("C-b",		cmd_mini_backward_char);
351 	minibuffer_set_key("<right>",		cmd_mini_forward_char);
352 	minibuffer_set_key("<left>",		cmd_mini_backward_char);
353 	minibuffer_set_key("C-e",		cmd_mini_move_end_of_line);
354 	minibuffer_set_key("C-a",		cmd_mini_move_beginning_of_line);
355 	minibuffer_set_key("<end>",		cmd_mini_move_end_of_line);
356 	minibuffer_set_key("<home>",		cmd_mini_move_beginning_of_line);
357 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
358 
359 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
360 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
361 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
362 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
363 }
364 
365 static void
366 restore_cursor(struct tab *tab)
367 {
368 	struct vline	*vl;
369 	const char	*prfx;
370 
371 	vl =tab->s.current_line;
372 	if (vl == NULL || vl->line == NULL)
373 		tab->s.curs_x = tab->s.line_x = 0;
374 	else
375 		tab->s.curs_x = utf8_snwidth(vl->line, tab->s.line_x);
376 
377 	if (vl != NULL) {
378 		prfx = line_prefixes[vl->parent->type].prfx1;
379 		tab->s.curs_x += utf8_swidth(prfx);
380 	}
381 }
382 
383 static void
384 cmd_previous_line(struct tab *tab)
385 {
386 	struct vline	*vl;
387 
388 	if (tab->s.current_line == NULL
389 	    || (vl = TAILQ_PREV(tab->s.current_line, vhead, vlines)) == NULL)
390 		return;
391 
392 	if (--tab->s.curs_y < 0) {
393 		tab->s.curs_y = 0;
394 		cmd_scroll_line_up(tab);
395 		return;
396 	}
397 
398 	tab->s.current_line = vl;
399 	restore_cursor(tab);
400 }
401 
402 static void
403 cmd_next_line(struct tab *tab)
404 {
405 	struct vline	*vl;
406 
407 	if (tab->s.current_line == NULL
408 	    || (vl = TAILQ_NEXT(tab->s.current_line, vlines)) == NULL)
409 		return;
410 
411 	if (++tab->s.curs_y > body_lines-1) {
412 		tab->s.curs_y = body_lines-1;
413 		cmd_scroll_line_down(tab);
414 		return;
415 	}
416 
417 	tab->s.current_line = vl;
418 	restore_cursor(tab);
419 }
420 
421 static void
422 cmd_backward_char(struct tab *tab)
423 {
424 	if (tab->s.line_x != 0)
425 		tab->s.line_x--;
426 	restore_cursor(tab);
427 }
428 
429 static void
430 cmd_forward_char(struct tab *tab)
431 {
432 	tab->s.line_x++;
433 	restore_cursor(tab);
434 }
435 
436 static void
437 cmd_backward_paragraph(struct tab *tab)
438 {
439 	do {
440 		if (tab->s.current_line == NULL ||
441 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
442 			message("No previous paragraph");
443 			return;
444 		}
445 		cmd_previous_line(tab);
446 	} while (tab->s.current_line->line != NULL ||
447 	    tab->s.current_line->parent->type != LINE_TEXT);
448 }
449 
450 static void
451 cmd_forward_paragraph(struct tab *tab)
452 {
453 	do {
454 		if (tab->s.current_line == NULL ||
455 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
456 			message("No next paragraph");
457 			return;
458 		}
459 		cmd_next_line(tab);
460 	} while (tab->s.current_line->line != NULL ||
461 	    tab->s.current_line->parent->type != LINE_TEXT);
462 }
463 
464 static void
465 cmd_move_beginning_of_line(struct tab *tab)
466 {
467 	tab->s.line_x = 0;
468 	restore_cursor(tab);
469 }
470 
471 static void
472 cmd_move_end_of_line(struct tab *tab)
473 {
474 	struct vline	*vl;
475 
476 	vl = tab->s.current_line;
477 	if (vl->line == NULL)
478 		return;
479 	tab->s.line_x = utf8_cplen(vl->line);
480 	restore_cursor(tab);
481 }
482 
483 static void
484 cmd_redraw(struct tab *tab)
485 {
486 	handle_resize(0, 0, NULL);
487 }
488 
489 static void
490 cmd_scroll_line_up(struct tab *tab)
491 {
492 	struct vline	*vl;
493 
494 	if (tab->s.line_off == 0)
495 		return;
496 
497 	vl = nth_line(tab, --tab->s.line_off);
498 	wscrl(body, -1);
499 	wmove(body, 0, 0);
500 	print_vline(vl);
501 
502 	tab->s.current_line = TAILQ_PREV(tab->s.current_line, vhead, vlines);
503 	restore_cursor(tab);
504 }
505 
506 static void
507 cmd_scroll_line_down(struct tab *tab)
508 {
509 	struct vline	*vl;
510 
511 	vl = tab->s.current_line;
512 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
513 		return;
514 	tab->s.current_line = vl;
515 
516 	tab->s.line_off++;
517 	wscrl(body, 1);
518 
519 	if (tab->s.line_max - tab->s.line_off < (size_t)body_lines)
520 		return;
521 
522 	vl = nth_line(tab, tab->s.line_off + body_lines-1);
523 	wmove(body, body_lines-1, 0);
524 	print_vline(vl);
525 
526 	restore_cursor(tab);
527 }
528 
529 static void
530 cmd_scroll_up(struct tab *tab)
531 {
532 	size_t off;
533 
534 	off = body_lines+1;
535 
536 	for (; off > 0; --off)
537 		cmd_scroll_line_up(tab);
538 }
539 
540 static void
541 cmd_scroll_down(struct tab *tab)
542 {
543 	size_t off;
544 
545 	off = body_lines+1;
546 
547 	for (; off > 0; --off)
548 		cmd_scroll_line_down(tab);
549 }
550 
551 static void
552 cmd_beginning_of_buffer(struct tab *tab)
553 {
554 	tab->s.current_line = TAILQ_FIRST(&tab->s.head);
555 	tab->s.line_off = 0;
556 	tab->s.curs_y = 0;
557 	tab->s.line_x = 0;
558 	restore_cursor(tab);
559 	redraw_body(tab);
560 }
561 
562 static void
563 cmd_end_of_buffer(struct tab *tab)
564 {
565 	ssize_t off;
566 
567 	off = tab->s.line_max - body_lines;
568 	off = MAX(0, off);
569 
570 	tab->s.line_off = off;
571 	tab->s.curs_y = MIN((size_t)body_lines, tab->s.line_max-1);
572 
573 	tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
574 	tab->s.line_x = body_cols;
575 	restore_cursor(tab);
576 	redraw_body(tab);
577 }
578 
579 static void
580 cmd_kill_telescope(struct tab *tab)
581 {
582 	event_loopbreak();
583 }
584 
585 static void
586 cmd_push_button(struct tab *tab)
587 {
588 	struct vline	*vl;
589 	size_t		 nth;
590 
591 	nth = tab->s.line_off + tab->s.curs_y;
592 	if (nth >= tab->s.line_max)
593 		return;
594 	vl = nth_line(tab, nth);
595 	if (vl->parent->type != LINE_LINK)
596 		return;
597 
598 	load_url_in_tab(tab, vl->parent->alt);
599 }
600 
601 static void
602 cmd_push_button_new_tab(struct tab *tab)
603 {
604 	struct vline	*vl;
605 	size_t		 nth;
606 
607 	nth = tab->s.line_off + tab->s.curs_y;
608 	if (nth > tab->s.line_max)
609 		return;
610 	vl = nth_line(tab, nth);
611 	if (vl->parent->type != LINE_LINK)
612 		return;
613 
614 	new_tab(vl->parent->alt);
615 }
616 
617 static void
618 cmd_previous_button(struct tab *tab)
619 {
620 	do {
621 		if (tab->s.current_line == NULL ||
622 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
623 			message("No previous link");
624 			return;
625 		}
626 		cmd_previous_line(tab);
627 	} while (tab->s.current_line->parent->type != LINE_LINK);
628 }
629 
630 static void
631 cmd_next_button(struct tab *tab)
632 {
633 	do {
634 		if (tab->s.current_line == NULL ||
635 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
636 			message("No next link");
637 			return;
638 		}
639 		cmd_next_line(tab);
640 	} while (tab->s.current_line->parent->type != LINE_LINK);
641 }
642 
643 static void
644 cmd_previous_page(struct tab *tab)
645 {
646 	if (!load_previous_page(tab))
647 		message("No previous page");
648 	else
649 		start_loading_anim(tab);
650 }
651 
652 static void
653 cmd_next_page(struct tab *tab)
654 {
655 	if (!load_next_page(tab))
656 		message("No next page");
657 	else
658 		start_loading_anim(tab);
659 }
660 
661 static void
662 cmd_clear_minibuf(struct tab *tab)
663 {
664 	handle_clear_minibuf(0, 0, NULL);
665 }
666 
667 static void
668 cmd_execute_extended_command(struct tab *tab)
669 {
670 	size_t	 len;
671 
672 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
673 	    &eecmd_history);
674 
675 	len = sizeof(ministate.prompt);
676 	strlcpy(ministate.prompt, "", len);
677 
678 	if (thiskey.meta)
679 		strlcat(ministate.prompt, "M-", len);
680 
681 	strlcat(ministate.prompt, keyname(thiskey.key), len);
682 	strlcat(ministate.prompt, " ", len);
683 }
684 
685 static void
686 cmd_tab_close(struct tab *tab)
687 {
688 	struct tab *t;
689 
690 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
691 	    TAILQ_NEXT(tab, tabs) == NULL) {
692 		message("Can't close the only tab.");
693 		return;
694 	}
695 
696 	if (evtimer_pending(&tab->s.loadingev, NULL))
697 		evtimer_del(&tab->s.loadingev);
698 
699 	stop_tab(tab);
700 
701 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
702 		t = TAILQ_NEXT(tab, tabs);
703 	TAILQ_REMOVE(&tabshead, tab, tabs);
704 	free(tab);
705 
706 	switch_to_tab(t);
707 }
708 
709 static void
710 cmd_tab_close_other(struct tab *tab)
711 {
712 	struct tab *t, *i;
713 
714 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
715 		if (t->flags & TAB_CURRENT)
716 			continue;
717 
718 		stop_tab(t);
719 		TAILQ_REMOVE(&tabshead, t, tabs);
720 		free(t);
721 	}
722 }
723 
724 static void
725 cmd_tab_new(struct tab *tab)
726 {
727 	new_tab(NEW_TAB_URL);
728 }
729 
730 static void
731 cmd_tab_next(struct tab *tab)
732 {
733 	struct tab *t;
734 
735 	tab->flags &= ~TAB_CURRENT;
736 
737 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
738 		t = TAILQ_FIRST(&tabshead);
739 	t->flags |= TAB_CURRENT;
740 }
741 
742 static void
743 cmd_tab_previous(struct tab *tab)
744 {
745 	struct tab *t;
746 
747 	tab->flags &= ~TAB_CURRENT;
748 
749 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
750 		t = TAILQ_LAST(&tabshead, tabshead);
751 	t->flags |= TAB_CURRENT;
752 }
753 
754 static void
755 cmd_load_url(struct tab *tab)
756 {
757 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
758 	    &lu_history);
759 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
760 }
761 
762 static void
763 cmd_load_current_url(struct tab *tab)
764 {
765 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
766 	    &lu_history);
767 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
768 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
769 	ministate.curs = strchr(ministate.buf, '\0');
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.curs = strchr(ministate.buf, '\0');
779 }
780 
781 static void
782 cmd_goto_bookmarks(struct tab *tab)
783 {
784 	load_url_in_tab(tab, "about:bookmarks");
785 }
786 
787 static void
788 global_key_unbound(void)
789 {
790 	message("%s is undefined", keybuf);
791 }
792 
793 static void
794 cmd_mini_delete_char(struct tab *tab)
795 {
796 	char *n;
797 
798 	minibuffer_taint_hist();
799 
800 	if (*(n = utf8_next_cp(ministate.curs)) == '\0')
801 		return;
802 
803 	memmove(ministate.curs, n, strlen(n)+1);
804 }
805 
806 static void
807 cmd_mini_delete_backward_char(struct tab *tab)
808 {
809 	char *p;
810 
811 	minibuffer_taint_hist();
812 
813 	if ((p = utf8_prev_cp(ministate.curs, ministate.buf)) == ministate.buf)
814 		return;
815 
816 	memmove(p, ministate.curs, strlen(ministate.curs)+1);
817 }
818 
819 static void
820 cmd_mini_forward_char(struct tab *tab)
821 {
822 	if (*ministate.curs == '\0')
823 		return;
824 	ministate.curs = utf8_next_cp(ministate.curs);
825 	ministate.cpoff++;
826 }
827 
828 static void
829 cmd_mini_backward_char(struct tab *tab)
830 {
831 	if (ministate.cpoff == 0)
832 		return;
833 	ministate.cpoff--;
834 	ministate.curs = utf8_prev_cp(ministate.curs-1, ministate.buf);
835 }
836 
837 static void
838 cmd_mini_move_end_of_line(struct tab *tab)
839 {
840 	ministate.curs = strchr(ministate.buf, '\0');
841 	ministate.cpoff = utf8_cplen(ministate.buf);
842 }
843 
844 static void
845 cmd_mini_move_beginning_of_line(struct tab *tab)
846 {
847 	ministate.curs = ministate.buf;
848 	ministate.cpoff = 0;
849 }
850 
851 static void
852 cmd_mini_kill_line(struct tab *tab)
853 {
854 	minibuffer_taint_hist();
855 	*ministate.curs = '\0';
856 }
857 
858 static void
859 cmd_mini_abort(struct tab *tab)
860 {
861 	ministate.abortfn();
862 }
863 
864 static void
865 cmd_mini_complete_and_exit(struct tab *tab)
866 {
867 	minibuffer_taint_hist();
868 	ministate.donefn();
869 }
870 
871 static void
872 cmd_mini_previous_history_element(struct tab *tab)
873 {
874 	if (ministate.history == NULL) {
875 		message("No history");
876 		return;
877 	}
878 
879 	if (ministate.hist_cur == NULL ||
880 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
881 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
882 		ministate.hist_off = ministate.history->len - 1;
883 		if (ministate.hist_cur == NULL)
884 			message("No prev item");
885 	} else {
886 		ministate.hist_off--;
887 	}
888 
889 	if (ministate.hist_cur != NULL)
890 		ministate.curs = ministate.hist_cur->h;
891 }
892 
893 static void
894 cmd_mini_next_history_element(struct tab *tab)
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_NEXT(ministate.hist_cur, entries)) == NULL) {
903 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
904 		ministate.hist_off = 0;
905 		if (ministate.hist_cur == NULL)
906 			message("No next item");
907 	} else {
908 		ministate.hist_off++;
909 	}
910 
911 	if (ministate.hist_cur != NULL)
912 		ministate.curs = ministate.hist_cur->h;
913 }
914 
915 static void
916 minibuffer_hist_save_entry(void)
917 {
918 	struct hist	*hist;
919 
920 	if (ministate.history == NULL)
921 		return;
922 
923 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
924 		abort();
925 
926 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
927 
928 	if (TAILQ_EMPTY(&ministate.history->head))
929 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
930 	else
931 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
932 	ministate.history->len++;
933 }
934 
935 /*
936  * taint the minibuffer cache: if we're currently showing a history
937  * element, copy that to the current buf and reset the "history
938  * navigation" thing.
939  */
940 static void
941 minibuffer_taint_hist(void)
942 {
943 	if (ministate.hist_cur == NULL)
944 		return;
945 
946 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
947 	ministate.hist_cur = NULL;
948 }
949 
950 static void
951 minibuffer_self_insert(void)
952 {
953 	char	tmp[5] = {0};
954 	size_t	len;
955 
956 	minibuffer_taint_hist();
957 
958 	if (thiskey.cp == 0)
959 		return;
960 
961 	len = utf8_encode(thiskey.cp, tmp);
962 	if (ministate.curs + len > ministate.buf + sizeof(ministate.buf) - 1)
963 		return;
964 
965 	memmove(ministate.curs + len, ministate.curs, strlen(ministate.curs)+1);
966 	memcpy(ministate.curs, tmp, len);
967 	ministate.curs = utf8_next_cp(ministate.curs);
968 	ministate.cpoff++;
969 }
970 
971 static void
972 eecmd_self_insert(void)
973 {
974 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
975 	    !unicode_isgraph(thiskey.cp)) {
976 		global_key_unbound();
977 		return;
978 	}
979 
980 	minibuffer_self_insert();
981 }
982 
983 static void
984 eecmd_select(void)
985 {
986 	exit_minibuffer();
987 	minibuffer_hist_save_entry();
988 	message("TODO: try to execute %s", ministate.buf);
989 }
990 
991 static void
992 ir_self_insert(void)
993 {
994 	minibuffer_self_insert();
995 }
996 
997 static void
998 ir_select(void)
999 {
1000 	char		 buf[1025] = {0};
1001 	struct url	 url;
1002 	struct tab	*tab;
1003 
1004 	tab = current_tab();
1005 
1006 	exit_minibuffer();
1007 	minibuffer_hist_save_entry();
1008 
1009 	/* a bit ugly but... */
1010 	memcpy(&url, &tab->url, sizeof(tab->url));
1011 	url_set_query(&url, ministate.buf);
1012 	url_unparse(&url, buf, sizeof(buf));
1013 	load_url_in_tab(tab, buf);
1014 }
1015 
1016 static void
1017 lu_self_insert(void)
1018 {
1019 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1020 	    !unicode_isgraph(thiskey.key)) {
1021 		global_key_unbound();
1022 		return;
1023 	}
1024 
1025 	minibuffer_self_insert();
1026 }
1027 
1028 static void
1029 lu_select(void)
1030 {
1031 	exit_minibuffer();
1032 	minibuffer_hist_save_entry();
1033 	load_url_in_tab(current_tab(), ministate.buf);
1034 }
1035 
1036 static void
1037 bp_select(void)
1038 {
1039 	exit_minibuffer();
1040 	if (*ministate.buf != '\0')
1041 		add_to_bookmarks(ministate.buf);
1042 	else
1043 		message("Abort.");
1044 }
1045 
1046 static struct vline *
1047 nth_line(struct tab *tab, size_t n)
1048 {
1049 	struct vline	*vl;
1050 	size_t		 i;
1051 
1052 	i = 0;
1053 	TAILQ_FOREACH(vl, &tab->s.head, vlines) {
1054 		if (i == n)
1055 			return vl;
1056 		i++;
1057 	}
1058 
1059 	/* unreachable */
1060 	abort();
1061 }
1062 
1063 static struct tab *
1064 current_tab(void)
1065 {
1066 	struct tab *t;
1067 
1068 	TAILQ_FOREACH(t, &tabshead, tabs) {
1069 		if (t->flags & TAB_CURRENT)
1070 			return t;
1071 	}
1072 
1073 	/* unreachable */
1074 	abort();
1075 }
1076 
1077 static int
1078 readkey(void)
1079 {
1080 	uint32_t state = 0;
1081 
1082 	if ((thiskey.key = wgetch(body)) == ERR)
1083 		return 0;
1084 
1085 	thiskey.meta = thiskey.key == 27;
1086 	if (thiskey.meta) {
1087 		thiskey.key = wgetch(body);
1088 		if (thiskey.key == ERR || thiskey.key == 27) {
1089 			thiskey.meta = 0;
1090 			thiskey.key = 27;
1091 		}
1092 	}
1093 
1094 	thiskey.cp = 0;
1095 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1096 		while (1) {
1097 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1098 				break;
1099 			if ((thiskey.key = wgetch(body)) == ERR) {
1100 				message("Error decoding user input");
1101 				return 0;
1102 			}
1103 		}
1104 	}
1105 
1106 	return 1;
1107 }
1108 
1109 static void
1110 dispatch_stdio(int fd, short ev, void *d)
1111 {
1112 	struct keymap	*k;
1113 	const char	*keyname;
1114 	char		 tmp[5] = {0};
1115 
1116 	if (!readkey())
1117 		return;
1118 
1119 	if (keybuf[0] != '\0')
1120 		strlcat(keybuf, " ", sizeof(keybuf));
1121 	if (thiskey.meta)
1122 		strlcat(keybuf, "M-", sizeof(keybuf));
1123 	if (thiskey.cp != 0) {
1124 		utf8_encode(thiskey.cp, tmp);
1125 		strlcat(keybuf, tmp, sizeof(keybuf));
1126 	} else {
1127 		if ((keyname = unkbd(thiskey.key)) != NULL)
1128 			strlcat(keybuf, keyname, sizeof(keybuf));
1129 		else {
1130 			tmp[0] = thiskey.key;
1131 			strlcat(keybuf, tmp, sizeof(keybuf));
1132 		}
1133 	}
1134 
1135 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1136 		if (k->meta == thiskey.meta &&
1137 		    k->key == thiskey.key) {
1138 			if (k->fn == NULL)
1139 				current_map = &k->map;
1140 			else {
1141 				current_map = base_map;
1142 				strlcpy(keybuf, "", sizeof(keybuf));
1143 				k->fn(current_tab());
1144 			}
1145 			goto done;
1146 		}
1147 	}
1148 
1149 	if (current_map->unhandled_input != NULL)
1150 		current_map->unhandled_input();
1151 	else {
1152 		global_key_unbound();
1153 	}
1154 
1155 	strlcpy(keybuf, "", sizeof(keybuf));
1156 	current_map = base_map;
1157 
1158 done:
1159 	redraw_tab(current_tab());
1160 }
1161 
1162 static void
1163 handle_clear_minibuf(int fd, short ev, void *d)
1164 {
1165 	free(ministate.curmesg);
1166 	ministate.curmesg = NULL;
1167 
1168 	redraw_minibuffer();
1169 	if (in_minibuffer) {
1170 		wrefresh(body);
1171 		wrefresh(minibuf);
1172 	} else {
1173 		wrefresh(minibuf);
1174 		wrefresh(body);
1175 	}
1176 }
1177 
1178 static void
1179 handle_resize(int sig, short ev, void *d)
1180 {
1181 	struct tab	*tab;
1182 
1183 	endwin();
1184 	refresh();
1185 	clear();
1186 
1187 	/* move and resize the windows, in reverse order! */
1188 
1189 	mvwin(minibuf, LINES-1, 0);
1190 	wresize(minibuf, 1, COLS);
1191 
1192 	mvwin(modeline, LINES-2, 0);
1193 	wresize(modeline, 1, COLS);
1194 
1195 	wresize(body, LINES-3, COLS);
1196 	body_lines = LINES-3;
1197 	body_cols = COLS;
1198 
1199 	wresize(tabline, 1, COLS);
1200 
1201 	tab = current_tab();
1202 
1203 	wrap_page(tab);
1204 	redraw_tab(tab);
1205 }
1206 
1207 static int
1208 wrap_page(struct tab *tab)
1209 {
1210 	struct line		*l;
1211 	const struct line	*orig;
1212 	struct vline		*vl;
1213 	const char		*prfx;
1214 
1215 	orig = tab->s.current_line == NULL
1216 		? NULL
1217 		: tab->s.current_line->parent;
1218 	tab->s.current_line = NULL;
1219 
1220 	tab->s.curs_y = 0;
1221 	tab->s.line_off = 0;
1222 
1223 	empty_vlist(tab);
1224 
1225 	TAILQ_FOREACH(l, &tab->page.head, lines) {
1226 		prfx = line_prefixes[l->type].prfx1;
1227 		switch (l->type) {
1228 		case LINE_TEXT:
1229 		case LINE_LINK:
1230 		case LINE_TITLE_1:
1231 		case LINE_TITLE_2:
1232 		case LINE_TITLE_3:
1233 		case LINE_ITEM:
1234 		case LINE_QUOTE:
1235 		case LINE_PRE_START:
1236 		case LINE_PRE_END:
1237 			wrap_text(tab, prfx, l, body_cols);
1238 			break;
1239 		case LINE_PRE_CONTENT:
1240                         hardwrap_text(tab, l, body_cols);
1241 			break;
1242 		}
1243 
1244 		if (orig == l && tab->s.current_line == NULL) {
1245 			tab->s.line_off = tab->s.line_max-1;
1246 			tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
1247 
1248 			while (1) {
1249 				vl = TAILQ_PREV(tab->s.current_line, vhead, vlines);
1250 				if (vl == NULL || vl->parent != orig)
1251 					break;
1252 				tab->s.current_line = vl;
1253 				tab->s.line_off--;
1254 			}
1255 		}
1256 	}
1257 
1258         if (tab->s.current_line == NULL)
1259 		tab->s.current_line = TAILQ_FIRST(&tab->s.head);
1260 
1261 	return 1;
1262 }
1263 
1264 static void
1265 print_vline(struct vline *vl)
1266 {
1267 	const char *text = vl->line;
1268 	const char *prfx;
1269 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1270 	int text_face = line_faces[vl->parent->type].text_prop;
1271 
1272 	if (!vl->flags)
1273 		prfx = line_prefixes[vl->parent->type].prfx1;
1274 	else
1275 		prfx = line_prefixes[vl->parent->type].prfx2;
1276 
1277 	if (text == NULL)
1278 		text = "";
1279 
1280 	wattron(body, prefix_face);
1281 	wprintw(body, "%s", prfx);
1282 	wattroff(body, prefix_face);
1283 
1284 	wattron(body, text_face);
1285 	wprintw(body, "%s", text);
1286 	wattroff(body, text_face);
1287 }
1288 
1289 static void
1290 redraw_tabline(void)
1291 {
1292 	struct tab	*tab;
1293 	size_t		 toskip;
1294 	int		 current, x, y, truncated;
1295 	const char	*title;
1296 	char		 buf[25];
1297 
1298 	toskip = 0;
1299 	x = 1;
1300 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1301 		x += sizeof(buf) + 1;
1302 		toskip++;
1303 		if (tab->flags & TAB_CURRENT)
1304 			break;
1305 	}
1306 	if (x < COLS-2)
1307 		toskip = 0;
1308 	else
1309 		toskip--;
1310 
1311 	werase(tabline);
1312 	wattron(tabline, tab_face.background);
1313 	wprintw(tabline, toskip == 0 ? " " : "<");
1314 	wattroff(tabline, tab_face.background);
1315 
1316 	truncated = 0;
1317 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1318 		if (truncated)
1319 			break;
1320 		if (toskip != 0) {
1321 			toskip--;
1322 			continue;
1323 		}
1324 
1325 		getyx(tabline, y, x);
1326 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1327 			truncated = 1;
1328 
1329 		current = tab->flags & TAB_CURRENT;
1330 
1331 		if (*(title = tab->page.title) == '\0')
1332 			title = tab->hist_cur->h;
1333 
1334 		strlcpy(buf, " ", sizeof(buf));
1335                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1336 			/* truncation happens */
1337 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1338 		} else {
1339 			/* pad with spaces */
1340 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1341 				/* nop */ ;
1342 		}
1343 
1344 		if (current)
1345 			wattron(tabline, tab_face.current_tab);
1346 		else
1347 			wattron(tabline, tab_face.tab);
1348 
1349 		wprintw(tabline, "%s", buf);
1350 		if (TAILQ_NEXT(tab, tabs) != NULL)
1351 			wprintw(tabline, " ");
1352 
1353 		if (current)
1354 			wattroff(tabline, tab_face.current_tab);
1355 		else
1356 			wattroff(tabline, tab_face.tab);
1357 	}
1358 
1359 	wattron(tabline, tab_face.background);
1360 	for (; x < COLS; ++x)
1361 		waddch(tabline, ' ');
1362 	if (truncated)
1363 		mvwprintw(tabline, 0, COLS-1, ">");
1364 }
1365 
1366 static inline char
1367 trust_status_char(enum trust_state ts)
1368 {
1369 	switch (ts) {
1370 	case TS_UNKNOWN:	return 'u';
1371 	case TS_UNTRUSTED:	return '!';
1372 	case TS_TRUSTED:	return 'v';
1373 	case TS_VERIFIED:	return 'V';
1374 	}
1375 }
1376 
1377 static void
1378 redraw_modeline(struct tab *tab)
1379 {
1380 	double		 pct;
1381 	int		 x, y, max_x, max_y;
1382 	const char	*mode = tab->page.name;
1383 	const char	*spin = "-\\|/";
1384 
1385 	werase(modeline);
1386 	wattron(modeline, A_REVERSE);
1387 	wmove(modeline, 0, 0);
1388 
1389 	wprintw(modeline, "-%c%c %s ",
1390 	    spin[tab->s.loading_anim_step],
1391 	    trust_status_char(tab->trust),
1392 	    mode == NULL ? "(none)" : mode);
1393 
1394 	pct = (tab->s.line_off + tab->s.curs_y) * 100.0 / tab->s.line_max;
1395 
1396 	if (tab->s.line_max <= (size_t)body_lines)
1397                 wprintw(modeline, "All ");
1398 	else if (tab->s.line_off == 0)
1399                 wprintw(modeline, "Top ");
1400 	else if (tab->s.line_off + body_lines >= tab->s.line_max)
1401 		wprintw(modeline, "Bottom ");
1402 	else
1403 		wprintw(modeline, "%.0f%% ", pct);
1404 
1405 	wprintw(modeline, "%d/%d %s ",
1406 	    tab->s.line_off + tab->s.curs_y,
1407 	    tab->s.line_max,
1408 	    tab->hist_cur->h);
1409 
1410 	getyx(modeline, y, x);
1411 	getmaxyx(modeline, max_y, max_x);
1412 
1413 	(void)y;
1414 	(void)max_y;
1415 
1416 	for (; x < max_x; ++x)
1417 		waddstr(modeline, "-");
1418 }
1419 
1420 static void
1421 redraw_minibuffer(void)
1422 {
1423 	struct tab *tab;
1424 	size_t off_y, off_x = 0;
1425 	char *start;
1426 
1427 	werase(minibuf);
1428 
1429 	if (in_minibuffer) {
1430 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1431 		if (ministate.hist_cur != NULL)
1432 			wprintw(minibuf, "(%zu/%zu) ",
1433 			    ministate.hist_off + 1,
1434 			    ministate.history->len);
1435 
1436 		getyx(minibuf, off_y, off_x);
1437 
1438 		start = ministate.hist_cur != NULL
1439 			? ministate.hist_cur->h
1440 			: ministate.buf;
1441 		while (utf8_swidth_between(start, ministate.curs) > (size_t)COLS/2) {
1442 			start = utf8_next_cp(start);
1443 		}
1444 
1445 		waddstr(minibuf, start);
1446 	}
1447 
1448 	if (ministate.curmesg != NULL)
1449                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1450 		    ministate.curmesg);
1451 
1452 	if (!in_minibuffer && ministate.curmesg == NULL)
1453 		waddstr(minibuf, keybuf);
1454 
1455 	/* If nothing else, show the URL at point */
1456 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1457 		tab = current_tab();
1458 		if (tab->s.current_line != NULL &&
1459 		    tab->s.current_line->parent->type == LINE_LINK)
1460 			waddstr(minibuf, tab->s.current_line->parent->alt);
1461 	}
1462 
1463 	if (in_minibuffer)
1464 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, ministate.curs));
1465 }
1466 
1467 static void
1468 redraw_tab(struct tab *tab)
1469 {
1470 	redraw_tabline();
1471 	redraw_body(tab);
1472 	redraw_modeline(tab);
1473 	redraw_minibuffer();
1474 
1475 	wrefresh(tabline);
1476 	wrefresh(modeline);
1477 
1478 	if (in_minibuffer) {
1479 		wrefresh(body);
1480 		wrefresh(minibuf);
1481 	} else {
1482 		wrefresh(minibuf);
1483 		wrefresh(body);
1484 	}
1485 }
1486 
1487 static void
1488 redraw_body(struct tab *tab)
1489 {
1490 	struct vline	*vl;
1491 	int		 line;
1492 
1493 	werase(body);
1494 
1495 	tab->s.line_off = MIN(tab->s.line_max-1, tab->s.line_off);
1496 	if (TAILQ_EMPTY(&tab->s.head))
1497 		return;
1498 
1499 	line = 0;
1500 	vl = nth_line(tab, tab->s.line_off);
1501 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1502 		wmove(body, line, 0);
1503 		print_vline(vl);
1504 		line++;
1505 		if (line == body_lines)
1506 			break;
1507 	}
1508 
1509 	wmove(body, tab->s.curs_y, tab->s.curs_x);
1510 }
1511 
1512 static void
1513 vmessage(const char *fmt, va_list ap)
1514 {
1515 	if (evtimer_pending(&clminibufev, NULL))
1516 		evtimer_del(&clminibufev);
1517 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1518 	evtimer_add(&clminibufev, &clminibufev_timer);
1519 
1520 	free(ministate.curmesg);
1521 
1522 	/* TODO: what to do if the allocation fails here? */
1523 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1524 		ministate.curmesg = NULL;
1525 
1526 	redraw_minibuffer();
1527 	if (in_minibuffer) {
1528 		wrefresh(body);
1529 		wrefresh(minibuf);
1530 	} else {
1531 		wrefresh(minibuf);
1532 		wrefresh(body);
1533 	}
1534 }
1535 
1536 static void
1537 message(const char *fmt, ...)
1538 {
1539 	va_list ap;
1540 
1541 	va_start(ap, fmt);
1542 	vmessage(fmt, ap);
1543 	va_end(ap);
1544 }
1545 
1546 static void
1547 start_loading_anim(struct tab *tab)
1548 {
1549 	if (tab->s.loading_anim)
1550 		return;
1551 	tab->s.loading_anim = 1;
1552 	evtimer_set(&tab->s.loadingev, update_loading_anim, tab);
1553 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1554 }
1555 
1556 static void
1557 update_loading_anim(int fd, short ev, void *d)
1558 {
1559 	struct tab	*tab = d;
1560 
1561 	tab->s.loading_anim_step = (tab->s.loading_anim_step+1)%4;
1562 
1563 	if (tab->flags & TAB_CURRENT) {
1564 		redraw_modeline(tab);
1565 		wrefresh(modeline);
1566 		wrefresh(body);
1567 		if (in_minibuffer)
1568 			wrefresh(minibuf);
1569 	}
1570 
1571 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1572 }
1573 
1574 static void
1575 stop_loading_anim(struct tab *tab)
1576 {
1577 	if (!tab->s.loading_anim)
1578 		return;
1579 	evtimer_del(&tab->s.loadingev);
1580 	tab->s.loading_anim = 0;
1581 	tab->s.loading_anim_step = 0;
1582 
1583 	if (!(tab->flags & TAB_CURRENT))
1584 		return;
1585 
1586 	redraw_modeline(tab);
1587 
1588 	wrefresh(modeline);
1589 	wrefresh(body);
1590 	if (in_minibuffer)
1591 		wrefresh(minibuf);
1592 }
1593 
1594 static void
1595 load_url_in_tab(struct tab *tab, const char *url)
1596 {
1597 	empty_vlist(tab);
1598 	message("Loading %s...", url);
1599 	start_loading_anim(tab);
1600 	load_url(tab, url);
1601 
1602 	tab->s.curs_x = 0;
1603 	tab->s.curs_y = 0;
1604 	redraw_tab(tab);
1605 }
1606 
1607 static void
1608 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1609     void (*abortfn)(void), struct histhead *hist)
1610 {
1611 	in_minibuffer = 1;
1612 	base_map = &minibuffer_map;
1613 	current_map = &minibuffer_map;
1614 
1615 	base_map->unhandled_input = self_insert_fn;
1616 
1617 	ministate.donefn = donefn;
1618 	ministate.abortfn = abortfn;
1619 	memset(ministate.buf, 0, sizeof(ministate.buf));
1620 	ministate.curs = ministate.buf;
1621 	ministate.cpoff = 0;
1622 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1623 
1624 	ministate.history = hist;
1625 	ministate.hist_cur = NULL;
1626 	ministate.hist_off = 0;
1627 }
1628 
1629 static void
1630 exit_minibuffer(void)
1631 {
1632 	werase(minibuf);
1633 
1634 	in_minibuffer = 0;
1635 	base_map = &global_map;
1636 	current_map = &global_map;
1637 }
1638 
1639 static void
1640 switch_to_tab(struct tab *tab)
1641 {
1642 	struct tab	*t;
1643 
1644 	TAILQ_FOREACH(t, &tabshead, tabs) {
1645 		t->flags &= ~TAB_CURRENT;
1646 	}
1647 
1648 	tab->flags |= TAB_CURRENT;
1649 }
1650 
1651 static struct tab *
1652 new_tab(const char *url)
1653 {
1654 	struct tab	*tab;
1655 
1656 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1657 		event_loopbreak();
1658 		return NULL;
1659 	}
1660 
1661 	TAILQ_INIT(&tab->hist.head);
1662 
1663 	TAILQ_INIT(&tab->s.head);
1664 
1665 	tab->id = tab_counter++;
1666 	switch_to_tab(tab);
1667 
1668 	if (TAILQ_EMPTY(&tabshead))
1669 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1670 	else
1671 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1672 
1673 	load_url_in_tab(tab, url);
1674 	return tab;
1675 }
1676 
1677 static void
1678 usage(void)
1679 {
1680 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1681 }
1682 
1683 int
1684 ui_init(int argc, char * const *argv)
1685 {
1686 	const char *url = NEW_TAB_URL;
1687 	int ch;
1688 
1689 	while ((ch = getopt(argc, argv, "")) != -1) {
1690 		switch (ch) {
1691 		default:
1692 			usage();
1693 			return 0;
1694 		}
1695 	}
1696 	argc -= optind;
1697 	argv += optind;
1698 
1699 	if (argc != 0)
1700 		url = argv[0];
1701 
1702 	setlocale(LC_ALL, "");
1703 
1704 	TAILQ_INIT(&global_map.m);
1705 	global_map.unhandled_input = global_key_unbound;
1706 
1707 	TAILQ_INIT(&minibuffer_map.m);
1708 
1709 	TAILQ_INIT(&eecmd_history.head);
1710 	TAILQ_INIT(&ir_history.head);
1711 	TAILQ_INIT(&lu_history.head);
1712 
1713 	base_map = &global_map;
1714 	current_map = &global_map;
1715 	load_default_keys();
1716 
1717 	initscr();
1718 	raw();
1719 	noecho();
1720 
1721 	nonl();
1722 	intrflush(stdscr, FALSE);
1723 
1724 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1725 		return 0;
1726 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1727 		return 0;
1728 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1729 		return 0;
1730 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1731 		return 0;
1732 
1733 	body_lines = LINES-3;
1734 	body_cols = COLS;
1735 
1736 	keypad(body, TRUE);
1737 	scrollok(body, TRUE);
1738 
1739 	/* non-blocking input */
1740 	wtimeout(body, 0);
1741 
1742 	mvwprintw(body, 0, 0, "");
1743 
1744 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1745 	event_add(&stdioev, NULL);
1746 
1747 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1748 	signal_add(&winchev, NULL);
1749 
1750 	new_tab(url);
1751 
1752 	return 1;
1753 }
1754 
1755 void
1756 ui_on_tab_loaded(struct tab *tab)
1757 {
1758 	stop_loading_anim(tab);
1759 	message("Loaded %s", tab->hist_cur->h);
1760 
1761 	redraw_tabline();
1762 	wrefresh(tabline);
1763 	if (in_minibuffer)
1764 		wrefresh(minibuf);
1765 	else
1766 		wrefresh(body);
1767 }
1768 
1769 void
1770 ui_on_tab_refresh(struct tab *tab)
1771 {
1772 	wrap_page(tab);
1773 	if (tab->flags & TAB_CURRENT)
1774 		redraw_tab(tab);
1775 }
1776 
1777 void
1778 ui_require_input(struct tab *tab, int hide)
1779 {
1780 	/* TODO: hard-switching to another tab is ugly */
1781 	switch_to_tab(tab);
1782 
1783 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1784 	    &ir_history);
1785 	strlcpy(ministate.prompt, "Input required: ",
1786 	    sizeof(ministate.prompt));
1787 	redraw_tab(tab);
1788 }
1789 
1790 void
1791 ui_notify(const char *fmt, ...)
1792 {
1793 	va_list ap;
1794 
1795 	va_start(ap, fmt);
1796 	vmessage(fmt, ap);
1797 	va_end(ap);
1798 }
1799 
1800 void
1801 ui_end(void)
1802 {
1803 	endwin();
1804 }