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Date:: Sat Mar 13 18:44:50 2021 UTC
Message:: move keymap funcs in its own file
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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  *
21  * Text wrapping
22  * =============
23  *
24  * There's a simple text wrapping algorithm.
25  *
26  * 1. if it's a line in a pre-formatted block:
27  *    a. hard wrap.
28  *    b. repeat
29  * 2. there is enough room for the next word?
30  *    a. yes: render it
31  *    b. no: break the current line.
32  *       i.  while there isn't enough space to draw the current
33  *           word, hard-wrap it
34  *       ii. draw the remainder of the current word (can be the
35  *           the entirely)
36  * 3. render the spaces after the word
37  *    a. but if there is not enough room break the line and
38  *       forget them
39  * 4. repeat
40  *
41  *
42  * Text scrolling
43  * ==============
44  *
45  * ncurses allows you to scroll a window, but when a line goes out of
46  * the visible area it's forgotten.  We keep a list of formatted lines
47  * (``visual lines'') that we know fits in the window, and draw them.
48  * This way is easy to scroll: just call wscrl and then render the
49  * first/last line!
50  *
51  * This means that on every resize we have to clear our list of lines
52  * and re-render everything.  A clever approach would be to do this
53  * ``on-demand''.
54  *
55  * TODO: make the text formatting on-demand.
56  *
57  */
58 
59 #include <telescope.h>
60 
61 #include <ctype.h>
62 #include <curses.h>
63 #include <event.h>
64 #include <locale.h>
65 #include <signal.h>
66 #include <stdarg.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <unistd.h>
70 
71 #define TAB_CURRENT	0x1
72 
73 #define MIN(a, b) ((a) < (b) ? (a) : (b))
74 #define MAX(a, b) ((a) > (b) ? (a) : (b))
75 
76 struct kmap;
77 struct minibuf_histhead;
78 
79 static struct event	stdioev, winchev;
80 
81 static void		 load_default_keys(void);
82 static int		 push_line(struct tab*, const struct line*, const char*, size_t, int);
83 static void		 empty_vlist(struct tab*);
84 static void		 restore_cursor(struct tab *);
85 
86 static void		 cmd_previous_line(struct tab*);
87 static void		 cmd_next_line(struct tab*);
88 static void		 cmd_forward_char(struct tab*);
89 static void		 cmd_backward_char(struct tab*);
90 static void		 cmd_move_beginning_of_line(struct tab*);
91 static void		 cmd_move_end_of_line(struct tab*);
92 static void		 cmd_redraw(struct tab*);
93 static void		 cmd_scroll_line_down(struct tab*);
94 static void		 cmd_scroll_line_up(struct tab*);
95 static void		 cmd_scroll_up(struct tab*);
96 static void		 cmd_scroll_down(struct tab*);
97 static void		 cmd_beginning_of_buffer(struct tab*);
98 static void		 cmd_end_of_buffer(struct tab*);
99 static void		 cmd_kill_telescope(struct tab*);
100 static void		 cmd_push_button(struct tab*);
101 static void		 cmd_push_button_new_tab(struct tab*);
102 static void		 cmd_clear_minibuf(struct tab*);
103 static void		 cmd_execute_extended_command(struct tab*);
104 static void		 cmd_tab_close(struct tab*);
105 static void		 cmd_tab_new(struct tab*);
106 static void		 cmd_tab_next(struct tab*);
107 static void		 cmd_tab_previous(struct tab*);
108 static void		 cmd_load_url(struct tab*);
109 static void		 cmd_load_current_url(struct tab*);
110 
111 static void		 global_key_unbound(void);
112 
113 static void		 cmd_mini_delete_char(struct tab*);
114 static void		 cmd_mini_delete_backward_char(struct tab*);
115 static void		 cmd_mini_forward_char(struct tab*);
116 static void		 cmd_mini_backward_char(struct tab*);
117 static void		 cmd_mini_move_end_of_line(struct tab*);
118 static void		 cmd_mini_move_beginning_of_line(struct tab*);
119 static void		 cmd_mini_kill_line(struct tab*);
120 static void		 cmd_mini_abort(struct tab*);
121 static void		 cmd_mini_complete_and_exit(struct tab*);
122 static void		 cmd_mini_previous_history_element(struct tab*);
123 static void		 cmd_mini_next_history_element(struct tab*);
124 
125 static void		 minibuffer_hist_save_entry(void);
126 static void		 minibuffer_taint_hist(void);
127 static void		 minibuffer_self_insert(void);
128 static void		 eecmd_self_insert(void);
129 static void		 eecmd_select(void);
130 static void		 ir_self_insert(void);
131 static void		 ir_select(void);
132 static void		 lu_self_insert(void);
133 static void		 lu_select(void);
134 
135 static struct line	*nth_line(struct tab*, size_t);
136 static struct tab	*current_tab(void);
137 static void		 dispatch_stdio(int, short, void*);
138 static void		 handle_clear_minibuf(int, short, void*);
139 static void		 handle_resize(int, short, void*);
140 static int		 word_bourdaries(const char*, const char*, const char**, const char**);
141 static void		 wrap_text(struct tab*, const char*, struct line*);
142 static int		 hardwrap_text(struct tab*, struct line*);
143 static int		 wrap_page(struct tab*);
144 static void		 print_line(struct line*);
145 static void		 redraw_tabline(void);
146 static void		 redraw_body(struct tab*);
147 static void		 redraw_modeline(struct tab*);
148 static void		 redraw_minibuffer(void);
149 static void		 redraw_tab(struct tab*);
150 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
151 static void		 start_loading_anim(struct tab*);
152 static void		 update_loading_anim(int, short, void*);
153 static void		 stop_loading_anim(struct tab*);
154 static void		 load_url_in_tab(struct tab*, const char*);
155 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct minibuf_histhead*);
156 static void		 exit_minibuffer(void);
157 static void		 switch_to_tab(struct tab*);
158 static struct tab	*new_tab(void);
159 
160 static struct { int meta, key; } thiskey;
161 
162 static WINDOW	*tabline, *body, *modeline, *minibuf;
163 static int	 body_lines, body_cols;
164 
165 static struct event	clminibufev;
166 static int		clminibufev_set;
167 static struct timeval	clminibufev_timer = { 5, 0 };
168 static struct timeval	loadingev_timer = { 0, 250000 };
169 
170 static uint32_t		 tab_counter;
171 
172 struct ui_state {
173 	int			curs_x;
174 	int			curs_y;
175 	size_t			line_off;
176 	size_t			line_max;
177 
178 	short			loading_anim;
179 	short			loading_anim_step;
180 	struct event		loadingev;
181 
182 	TAILQ_HEAD(, line)	head;
183 };
184 
185 static char	keybuf[64];
186 
187 struct kmap global_map,
188 	minibuffer_map,
189 	*current_map,
190 	*base_map;
191 
192 /* TODO: limit to a maximum number of entries */
193 struct minibuf_histhead {
194 	TAILQ_HEAD(mhisthead, minibuf_hist)	head;
195 	size_t					len;
196 };
197 struct minibuf_hist {
198 	char				h[1025];
199 	TAILQ_ENTRY(minibuf_hist)	entries;
200 };
201 
202 static struct minibuf_histhead eecmd_history,
203 	ir_history,
204 	lu_history;
205 
206 static int	in_minibuffer;
207 
208 static struct {
209 	char	*curmesg;
210 
211 	char	 buf[1025];
212 	size_t	 off, len;
213 	char	 prompt[32];
214 	void	 (*donefn)(void);
215 	void	 (*abortfn)(void);
216 
217 	struct minibuf_histhead	*history;
218 	struct minibuf_hist	*hist_cur;
219 	size_t			 hist_off;
220 } ministate;
221 
222 struct lineprefix {
223 	const char	*prfx1;
224 	const char	*prfx2;
225 } line_prefixes[] = {
226 	[LINE_TEXT] =		{ "",		"" },
227 	[LINE_LINK] =		{ "=> ",	"   " },
228 	[LINE_TITLE_1] =	{ "# ",		"  " },
229 	[LINE_TITLE_2] =	{ "## ",	"   " },
230 	[LINE_TITLE_3] =	{ "### ",	"    " },
231 	[LINE_ITEM] =		{ "* ",		"  " },
232 	[LINE_QUOTE] =		{ "> ",		"> " },
233 	[LINE_PRE_START] =	{ "```",	"```" },
234 	[LINE_PRE_CONTENT] =	{ "",		"" },
235 	[LINE_PRE_END] =	{ "```",	"```" },
236 };
237 
238 struct line_face {
239 	int prop;
240 } line_faces[] = {
241 	[LINE_TEXT] =		{ 0 },
242 	[LINE_LINK] =		{ A_UNDERLINE },
243 	[LINE_TITLE_1] =	{ A_BOLD },
244 	[LINE_TITLE_2] =	{ A_BOLD },
245 	[LINE_TITLE_3] =	{ A_BOLD },
246 	[LINE_ITEM] =		{ 0 },
247 	[LINE_QUOTE] =		{ A_DIM },
248 	[LINE_PRE_START] =	{ 0 },
249 	[LINE_PRE_CONTENT] =	{ 0 },
250 	[LINE_PRE_END] =	{ 0 },
251 };
252 
253 static inline void
254 global_set_key(const char *key, void (*fn)(struct tab*))
255 {
256 	if (!kmap_define_key(&global_map, key, fn))
257 		_exit(1);
258 }
259 
260 static inline void
261 minibuffer_set_key(const char *key, void (*fn)(struct tab*))
262 {
263 	if (!kmap_define_key(&minibuffer_map, key, fn))
264 		_exit(1);
265 }
266 
267 static void
268 load_default_keys(void)
269 {
270 	/* === global map === */
271 
272 	/* emacs */
273 	global_set_key("C-p",		cmd_previous_line);
274 	global_set_key("C-n",		cmd_next_line);
275 	global_set_key("C-f",		cmd_forward_char);
276 	global_set_key("C-b",		cmd_backward_char);
277 	global_set_key("C-a",		cmd_move_beginning_of_line);
278 	global_set_key("C-e",		cmd_move_end_of_line);
279 
280 	global_set_key("M-v",		cmd_scroll_up);
281 	global_set_key("C-v",		cmd_scroll_down);
282 	global_set_key("M-space",	cmd_scroll_up);
283 	global_set_key("space",		cmd_scroll_down);
284 
285 	global_set_key("C-x C-c",	cmd_kill_telescope);
286 
287 	global_set_key("C-g",		cmd_clear_minibuf);
288 
289 	global_set_key("M-x",		cmd_execute_extended_command);
290 	global_set_key("C-x C-f",	cmd_load_url);
291 	global_set_key("C-x M-f",	cmd_load_current_url);
292 
293 	global_set_key("C-x t 0",	cmd_tab_close);
294 	global_set_key("C-x t 2",	cmd_tab_new);
295 	global_set_key("C-x t o",	cmd_tab_next);
296 	global_set_key("C-x t O",	cmd_tab_previous);
297 
298 	global_set_key("M-<",		cmd_beginning_of_buffer);
299 	global_set_key("M->",		cmd_end_of_buffer);
300 
301 	/* vi/vi-like */
302 	global_set_key("k",		cmd_previous_line);
303 	global_set_key("j",		cmd_next_line);
304 	global_set_key("l",		cmd_forward_char);
305 	global_set_key("h",		cmd_backward_char);
306 	global_set_key("^",		cmd_move_beginning_of_line);
307 	global_set_key("$",		cmd_move_end_of_line);
308 
309 	global_set_key("K",		cmd_scroll_line_up);
310 	global_set_key("J",		cmd_scroll_line_down);
311 
312 	global_set_key("g g",		cmd_beginning_of_buffer);
313 	global_set_key("G",		cmd_end_of_buffer);
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 	/* "ncurses standard" */
331 	global_set_key("C-l",		cmd_redraw);
332 
333 	/* global */
334 	global_set_key("C-m",		cmd_push_button);
335 	global_set_key("M-enter",	cmd_push_button_new_tab);
336 
337 	/* === minibuffer map === */
338 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
339 	minibuffer_set_key("C-g",		cmd_mini_abort);
340 	minibuffer_set_key("esc",		cmd_mini_abort);
341 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
342 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
343 
344 	minibuffer_set_key("C-f",		cmd_mini_forward_char);
345 	minibuffer_set_key("C-b",		cmd_mini_backward_char);
346 	minibuffer_set_key("<right>",		cmd_mini_forward_char);
347 	minibuffer_set_key("<left>",		cmd_mini_backward_char);
348 	minibuffer_set_key("C-e",		cmd_mini_move_end_of_line);
349 	minibuffer_set_key("C-a",		cmd_mini_move_beginning_of_line);
350 	minibuffer_set_key("<end>",		cmd_mini_move_end_of_line);
351 	minibuffer_set_key("<home>",		cmd_mini_move_beginning_of_line);
352 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
353 
354 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
355 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
356 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
357 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
358 }
359 
360 static int
361 push_line(struct tab *tab, const struct line *l, const char *buf, size_t len, int cont)
362 {
363 	struct line *vl;
364 
365 	tab->s->line_max++;
366 
367 	if ((vl = calloc(1, sizeof(*vl))) == NULL)
368 		return 0;
369 
370 	if (len != 0 && (vl->line = calloc(1, len+1)) == NULL) {
371 		free(vl);
372 		return 0;
373 	}
374 
375 	vl->type = l->type;
376 	if (len != 0)
377 		memcpy(vl->line, buf, len);
378 	vl->alt = l->alt;
379 	vl->flags = cont;
380 
381 	if (TAILQ_EMPTY(&tab->s->head))
382 		TAILQ_INSERT_HEAD(&tab->s->head, vl, lines);
383 	else
384 		TAILQ_INSERT_TAIL(&tab->s->head, vl, lines);
385 	return 1;
386 }
387 
388 static void
389 empty_vlist(struct tab *tab)
390 {
391 	struct line *l, *t;
392 
393 	tab->s->line_max = 0;
394 
395 	TAILQ_FOREACH_SAFE(l, &tab->s->head, lines, t) {
396 		TAILQ_REMOVE(&tab->s->head, l, lines);
397 		free(l->line);
398 		/* l->alt references the original line! */
399 		free(l);
400 	}
401 }
402 
403 static void
404 restore_cursor(struct tab *tab)
405 {
406 	wmove(body, tab->s->curs_y, tab->s->curs_x);
407 }
408 
409 static void
410 cmd_previous_line(struct tab *tab)
411 {
412 	if (--tab->s->curs_y < 0) {
413 		tab->s->curs_y = 0;
414 		cmd_scroll_line_up(tab);
415 	}
416 
417 	restore_cursor(tab);
418 }
419 
420 static void
421 cmd_next_line(struct tab *tab)
422 {
423 	if (tab->s->line_off + tab->s->curs_y >= tab->s->line_max)
424 		return;
425 
426 	if (++tab->s->curs_y > body_lines-1) {
427 		tab->s->curs_y = body_lines-1;
428 		cmd_scroll_line_down(tab);
429 	}
430 
431 	restore_cursor(tab);
432 }
433 
434 static void
435 cmd_forward_char(struct tab *tab)
436 {
437 	tab->s->curs_x = MIN(body_cols-1, tab->s->curs_x+1);
438 	restore_cursor(tab);
439 }
440 
441 static void
442 cmd_backward_char(struct tab *tab)
443 {
444 	tab->s->curs_x = MAX(0, tab->s->curs_x-1);
445 	restore_cursor(tab);
446 }
447 
448 static void
449 cmd_move_beginning_of_line(struct tab *tab)
450 {
451 	tab->s->curs_x = 0;
452 	restore_cursor(tab);
453 }
454 
455 static void
456 cmd_move_end_of_line(struct tab *tab)
457 {
458 	struct line	*line;
459 	size_t		 off;
460 	const char	*prfx;
461 
462 	off = tab->s->line_off + tab->s->curs_y;
463 	if (off >= tab->s->line_max) {
464 		tab->s->curs_x = 0;
465 		goto end;
466 	}
467 
468 	line = nth_line(tab, off);
469 	if (line->line != NULL)
470 		tab->s->curs_x = strlen(line->line);
471 	else
472 		tab->s->curs_x = 0;
473 
474 	prfx = line_prefixes[line->type].prfx1;
475 	tab->s->curs_x += strlen(prfx);
476 
477 end:
478 	restore_cursor(tab);
479 }
480 
481 static void
482 cmd_redraw(struct tab *tab)
483 {
484 	handle_resize(0, 0, NULL);
485 }
486 
487 static void
488 cmd_scroll_line_up(struct tab *tab)
489 {
490 	struct line	*l;
491 
492 	if (tab->s->line_off == 0)
493 		return;
494 
495 	l = nth_line(tab, --tab->s->line_off);
496 	wscrl(body, -1);
497 	wmove(body, 0, 0);
498 	print_line(l);
499 }
500 
501 static void
502 cmd_scroll_line_down(struct tab *tab)
503 {
504 	struct line	*l;
505 	size_t		 n;
506 
507 	if (tab->s->line_max == 0 || tab->s->line_off == tab->s->line_max-1)
508 		return;
509 
510 	tab->s->line_off++;
511 	wscrl(body, 1);
512 
513 	if (tab->s->line_max - tab->s->line_off < body_lines)
514 		return;
515 
516 	l = nth_line(tab, tab->s->line_off + body_lines-1);
517 	wmove(body, body_lines-1, 0);
518 	print_line(l);
519 }
520 
521 static void
522 cmd_scroll_up(struct tab *tab)
523 {
524 	size_t off;
525 
526 	off = body_lines+1;
527 
528 	for (; off > 0; --off)
529 		cmd_scroll_line_up(tab);
530 }
531 
532 static void
533 cmd_scroll_down(struct tab *tab)
534 {
535 	size_t off;
536 
537 	off = body_lines+1;
538 
539 	for (; off > 0; --off)
540 		cmd_scroll_line_down(tab);
541 }
542 
543 static void
544 cmd_beginning_of_buffer(struct tab *tab)
545 {
546 	tab->s->line_off = 0;
547 	tab->s->curs_y = 0;
548 	redraw_body(tab);
549 }
550 
551 static void
552 cmd_end_of_buffer(struct tab *tab)
553 {
554 	ssize_t off;
555 
556 	off = tab->s->line_max - body_lines;
557 	off = MAX(0, off);
558 
559 	tab->s->line_off = off;
560 	tab->s->curs_y = MIN(body_lines, tab->s->line_max);
561 
562 	redraw_body(tab);
563 }
564 
565 static void
566 cmd_kill_telescope(struct tab *tab)
567 {
568 	event_loopbreak();
569 }
570 
571 static void
572 cmd_push_button(struct tab *tab)
573 {
574 	struct line	*l;
575 	size_t		 nth;
576 
577 	nth = tab->s->line_off + tab->s->curs_y;
578 	if (nth >= tab->s->line_max)
579 		return;
580 	l = nth_line(tab, nth);
581 	if (l->type != LINE_LINK)
582 		return;
583 
584 	load_url_in_tab(tab, l->alt);
585 }
586 
587 static void
588 cmd_push_button_new_tab(struct tab *tab)
589 {
590 	struct tab	*t;
591 	struct line	*l;
592 	size_t		 nth;
593 
594 	nth = tab->s->line_off + tab->s->curs_y;
595 	if (nth > tab->s->line_max)
596 		return;
597 	l = nth_line(tab, nth);
598 	if (l->type != LINE_LINK)
599 		return;
600 
601 	t = new_tab();
602 	memcpy(&t->url, &tab->url, sizeof(tab->url));
603 	memcpy(&t->urlstr, &tab->urlstr, sizeof(tab->urlstr));
604 	load_url_in_tab(t, l->alt);
605 }
606 
607 static void
608 cmd_clear_minibuf(struct tab *tab)
609 {
610 	handle_clear_minibuf(0, 0, NULL);
611 }
612 
613 static void
614 cmd_execute_extended_command(struct tab *tab)
615 {
616 	size_t	 len;
617 
618 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
619 	    &eecmd_history);
620 
621 	len = sizeof(ministate.prompt);
622 	strlcpy(ministate.prompt, "", len);
623 
624 	if (thiskey.meta)
625 		strlcat(ministate.prompt, "M-", len);
626 
627 	strlcat(ministate.prompt, keyname(thiskey.key), len);
628 	strlcat(ministate.prompt, " ", len);
629 }
630 
631 static void
632 cmd_tab_close(struct tab *tab)
633 {
634 	struct tab *t;
635 
636 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
637 	    TAILQ_NEXT(tab, tabs) == NULL) {
638 		message("Can't close the only tab.");
639 		return;
640 	}
641 
642 	stop_tab(tab);
643 
644 	t = TAILQ_PREV(tab, tabshead, tabs);
645 	t->flags |= TAB_CURRENT;
646 
647 	TAILQ_REMOVE(&tabshead, tab, tabs);
648 
649 	free(tab->s);
650 	free(tab);
651 }
652 
653 static void
654 cmd_tab_new(struct tab *tab)
655 {
656 	new_tab();
657 }
658 
659 static void
660 cmd_tab_next(struct tab *tab)
661 {
662 	struct tab *t;
663 
664 	tab->flags &= ~TAB_CURRENT;
665 
666 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
667 		t = TAILQ_FIRST(&tabshead);
668 	t->flags |= TAB_CURRENT;
669 }
670 
671 static void
672 cmd_tab_previous(struct tab *tab)
673 {
674 	struct tab *t;
675 
676 	tab->flags &= ~TAB_CURRENT;
677 
678 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
679 		t = TAILQ_LAST(&tabshead, tabshead);
680 	t->flags |= TAB_CURRENT;
681 }
682 
683 static void
684 cmd_load_url(struct tab *tab)
685 {
686 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
687 	    &lu_history);
688 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
689 }
690 
691 static void
692 cmd_load_current_url(struct tab *tab)
693 {
694 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
695 	    &lu_history);
696 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
697 	strlcpy(ministate.buf, tab->urlstr, sizeof(ministate.buf));
698 	ministate.off = strlen(tab->urlstr);
699 	ministate.len = ministate.off;
700 }
701 
702 static void
703 global_key_unbound(void)
704 {
705 	message("%s is undefined", keybuf);
706 }
707 
708 static void
709 cmd_mini_delete_char(struct tab *tab)
710 {
711 	minibuffer_taint_hist();
712 
713 	if (ministate.len == 0 || ministate.off == ministate.len)
714 		return;
715 
716 	memmove(&ministate.buf[ministate.off],
717 	    &ministate.buf[ministate.off+1],
718 	    ministate.len - ministate.off + 1);
719 	ministate.len--;
720 }
721 
722 static void
723 cmd_mini_delete_backward_char(struct tab *tab)
724 {
725 	minibuffer_taint_hist();
726 
727 	if (ministate.len == 0 || ministate.off == 0)
728 		return;
729 
730 	memmove(&ministate.buf[ministate.off-1],
731 	    &ministate.buf[ministate.off],
732 	    ministate.len - ministate.off + 1);
733 	ministate.off--;
734 	ministate.len--;
735 }
736 
737 static void
738 cmd_mini_forward_char(struct tab *tab)
739 {
740 	if (ministate.off == ministate.len)
741 		return;
742 	ministate.off++;
743 }
744 
745 static void
746 cmd_mini_backward_char(struct tab *tab)
747 {
748 	if (ministate.off == 0)
749 		return;
750 	ministate.off--;
751 }
752 
753 static void
754 cmd_mini_move_end_of_line(struct tab *tab)
755 {
756 	ministate.off = ministate.len;
757 }
758 
759 static void
760 cmd_mini_move_beginning_of_line(struct tab *tab)
761 {
762 	ministate.off = 0;
763 }
764 
765 static void
766 cmd_mini_kill_line(struct tab *tab)
767 {
768 	minibuffer_taint_hist();
769 
770         if (ministate.off == ministate.len)
771 		return;
772 	ministate.buf[ministate.off] = '\0';
773 	ministate.len -= ministate.off;
774 }
775 
776 static void
777 cmd_mini_abort(struct tab *tab)
778 {
779         ministate.abortfn();
780 }
781 
782 static void
783 cmd_mini_complete_and_exit(struct tab *tab)
784 {
785 	minibuffer_taint_hist();
786 	ministate.donefn();
787 }
788 
789 static void
790 cmd_mini_previous_history_element(struct tab *tab)
791 {
792 	if (ministate.history == NULL) {
793 		message("No history");
794 		return;
795 	}
796 
797 	if (ministate.hist_cur == NULL ||
798 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
799 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
800 		ministate.hist_off = ministate.history->len - 1;
801 		if (ministate.hist_cur == NULL)
802 			message("No prev item");
803 	} else {
804 		ministate.hist_off--;
805 	}
806 
807 	if (ministate.hist_cur != NULL) {
808 		ministate.off = 0;
809 		ministate.len = strlen(ministate.hist_cur->h);
810 	}
811 }
812 
813 static void
814 cmd_mini_next_history_element(struct tab *tab)
815 {
816 	if (ministate.history == NULL) {
817 		message("No history");
818 		return;
819 	}
820 
821 	if (ministate.hist_cur == NULL ||
822 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
823 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
824 		ministate.hist_off = 0;
825 		if (ministate.hist_cur == NULL)
826 			message("No next item");
827 	} else {
828 		ministate.hist_off++;
829 	}
830 
831 	if (ministate.hist_cur != NULL) {
832 		ministate.off = 0;
833 		ministate.len = strlen(ministate.hist_cur->h);
834 	}
835 }
836 
837 static void
838 minibuffer_hist_save_entry(void)
839 {
840 	struct minibuf_hist	*hist;
841 
842 	if (ministate.history == NULL)
843 		return;
844 
845 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
846 		abort();
847 
848 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
849 
850 	if (TAILQ_EMPTY(&ministate.history->head))
851 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
852 	else
853 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
854 	ministate.history->len++;
855 }
856 
857 /*
858  * taint the minibuffer cache: if we're currently showing a history
859  * element, copy that to the current buf and reset the "history
860  * navigation" thing.
861  */
862 static void
863 minibuffer_taint_hist(void)
864 {
865 	if (ministate.hist_cur == NULL)
866 		return;
867 
868 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
869 	ministate.hist_cur = NULL;
870 }
871 
872 static void
873 minibuffer_self_insert(void)
874 {
875 	minibuffer_taint_hist();
876 
877 	if (ministate.len == sizeof(ministate.buf) -1)
878 		return;
879 
880 	/* TODO: utf8 handling! */
881 
882 	memmove(&ministate.buf[ministate.off+1],
883 	    &ministate.buf[ministate.off],
884 	    ministate.len - ministate.off + 1);
885 	ministate.buf[ministate.off] = thiskey.key;
886 	ministate.off++;
887 	ministate.len++;
888 }
889 
890 static void
891 eecmd_self_insert(void)
892 {
893 	if (thiskey.meta || isspace(thiskey.key) ||
894 	    !isgraph(thiskey.key)) {
895 		global_key_unbound();
896 		return;
897 	}
898 
899 	minibuffer_self_insert();
900 }
901 
902 static void
903 eecmd_select(void)
904 {
905 	exit_minibuffer();
906 	minibuffer_hist_save_entry();
907 	message("TODO: try to execute %s", ministate.buf);
908 }
909 
910 static void
911 ir_self_insert(void)
912 {
913 	minibuffer_self_insert();
914 }
915 
916 static void
917 ir_select(void)
918 {
919 	char		 buf[1025] = {0};
920 	struct url	 url;
921 	struct tab	*tab;
922 
923 	tab = current_tab();
924 
925 	exit_minibuffer();
926 	minibuffer_hist_save_entry();
927 
928 	/* a bit ugly but... */
929 	memcpy(&url, &tab->url, sizeof(tab->url));
930 	url_set_query(&url, ministate.buf);
931 	url_unparse(&url, buf, sizeof(buf));
932 	load_url_in_tab(tab, buf);
933 }
934 
935 static void
936 lu_self_insert(void)
937 {
938 	if (thiskey.meta || isspace(thiskey.key) ||
939 	    !isgraph(thiskey.key)) {
940 		global_key_unbound();
941 		return;
942 	}
943 
944 	minibuffer_self_insert();
945 }
946 
947 static void
948 lu_select(void)
949 {
950 	exit_minibuffer();
951 	minibuffer_hist_save_entry();
952 	load_url_in_tab(current_tab(), ministate.buf);
953 }
954 
955 static struct line *
956 nth_line(struct tab *tab, size_t n)
957 {
958 	struct line	*l;
959 	size_t		 i;
960 
961 	i = 0;
962 	TAILQ_FOREACH(l, &tab->s->head, lines) {
963 		if (i == n)
964 			return l;
965 		i++;
966 	}
967 
968 	/* unreachable */
969 	abort();
970 }
971 
972 static struct tab *
973 current_tab(void)
974 {
975 	struct tab *t;
976 
977 	TAILQ_FOREACH(t, &tabshead, tabs) {
978 		if (t->flags & TAB_CURRENT)
979 			return t;
980 	}
981 
982 	/* unreachable */
983 	abort();
984 }
985 
986 static void
987 dispatch_stdio(int fd, short ev, void *d)
988 {
989 	struct tab	*tab;
990 	struct keymap	*k;
991 	const char	*keyname;
992 	char		 tmp[2] = {0};
993 
994 	thiskey.key = wgetch(body);
995 	if (thiskey.key == ERR)
996 		return;
997 	if (thiskey.key == 27) {
998 		/* TODO: make escape-time customizable */
999 
1000 		thiskey.meta = 1;
1001 		thiskey.key = wgetch(body);
1002 		if (thiskey.key == ERR || thiskey.key == 27) {
1003 			thiskey.meta = 0;
1004 			thiskey.key = 27;
1005 		}
1006 	} else
1007 		thiskey.meta = 0;
1008 
1009 	if (keybuf[0] != '\0')
1010 		strlcat(keybuf, " ", sizeof(keybuf));
1011 	if (thiskey.meta)
1012 		strlcat(keybuf, "M-", sizeof(keybuf));
1013 	if ((keyname = unkbd(thiskey.key)) != NULL)
1014 		strlcat(keybuf, keyname, sizeof(keybuf));
1015 	else {
1016 		tmp[0] = thiskey.key;
1017 		strlcat(keybuf, tmp, sizeof(keybuf));
1018 	}
1019 
1020 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1021 		if (k->meta == thiskey.meta &&
1022 		    k->key == thiskey.key) {
1023 			if (k->fn == NULL)
1024 				current_map = &k->map;
1025 			else {
1026 				current_map = base_map;
1027 				strlcpy(keybuf, "", sizeof(keybuf));
1028 				k->fn(current_tab());
1029 			}
1030 			goto done;
1031 		}
1032 	}
1033 
1034 	if (current_map->unhandled_input != NULL)
1035 		current_map->unhandled_input();
1036 	else {
1037 		global_key_unbound();
1038 	}
1039 
1040 	strlcpy(keybuf, "", sizeof(keybuf));
1041 	current_map = base_map;
1042 
1043 done:
1044 	redraw_tab(current_tab());
1045 }
1046 
1047 static void
1048 handle_clear_minibuf(int fd, short ev, void *d)
1049 {
1050 	clminibufev_set = 0;
1051 
1052 	free(ministate.curmesg);
1053 	ministate.curmesg = NULL;
1054 
1055 	redraw_minibuffer();
1056 	if (in_minibuffer) {
1057 		wrefresh(body);
1058 		wrefresh(minibuf);
1059 	} else {
1060 		wrefresh(minibuf);
1061 		wrefresh(body);
1062 	}
1063 }
1064 
1065 static void
1066 handle_resize(int sig, short ev, void *d)
1067 {
1068 	struct tab	*tab;
1069 
1070 	endwin();
1071 	refresh();
1072 	clear();
1073 
1074 	/* move and resize the windows, in reverse order! */
1075 
1076 	mvwin(minibuf, LINES-1, 0);
1077 	wresize(minibuf, 1, COLS);
1078 
1079 	mvwin(modeline, LINES-2, 0);
1080 	wresize(modeline, 1, COLS);
1081 
1082 	wresize(body, LINES-3, COLS);
1083 	body_lines = LINES-3;
1084 	body_cols = COLS;
1085 
1086 	wresize(tabline, 1, COLS);
1087 
1088 	tab = current_tab();
1089 
1090 	wrap_page(tab);
1091 	redraw_tab(tab);
1092 }
1093 
1094 /*
1095  * Helper function for wrap_text.  Find the end of the current word
1096  * and the end of the separator after the word.
1097  */
1098 static int
1099 word_boundaries(const char *s, const char *sep, const char **endword, const char **endspc)
1100 {
1101 	*endword = s;
1102 	*endword = s;
1103 
1104 	if (*s == '\0')
1105 		return 0;
1106 
1107 	/* find the end of the current world */
1108 	for (; *s != '\0'; ++s) {
1109 		if (strchr(sep, *s) != NULL)
1110 			break;
1111 	}
1112 
1113 	*endword = s;
1114 
1115 	/* find the end of the separator */
1116 	for (; *s != '\0'; ++s) {
1117 		if (strchr(sep, *s) == NULL)
1118 			break;
1119 	}
1120 
1121 	*endspc = s;
1122 
1123 	return 1;
1124 }
1125 
1126 static inline int
1127 emitline(struct tab *tab, size_t zero, size_t *off, const struct line *l,
1128     const char **line, int *cont)
1129 {
1130 	if (!push_line(tab, l, *line, *off - zero, *cont))
1131 		return 0;
1132 	if (!*cont)
1133 		*cont = 1;
1134 	*line += *off - zero;
1135 	*off = zero;
1136 	return 1;
1137 }
1138 
1139 static inline void
1140 emitstr(const char **s, size_t len, size_t *off)
1141 {
1142 	size_t i;
1143 
1144 	/* printw("%*s", ...) doesn't seem to respect the precision, so... */
1145 	for (i = 0; i < len; ++i)
1146 		addch((*s)[i]);
1147 	*off += len;
1148 	*s += len;
1149 }
1150 
1151 /*
1152  * Build a list of visual line by wrapping the given line, assuming
1153  * that when printed will have a leading prefix prfx.
1154  *
1155  * TODO: it considers each byte one cell on the screen!
1156  */
1157 static void
1158 wrap_text(struct tab *tab, const char *prfx, struct line *l)
1159 {
1160 	size_t		 zero, off, len, split;
1161 	int		 cont = 0;
1162 	const char	*endword, *endspc, *line, *linestart;
1163 
1164 	zero = strlen(prfx);
1165 	off = zero;
1166 	line = l->line;
1167 	linestart = l->line;
1168 
1169 	while (word_boundaries(line, " \t-", &endword, &endspc)) {
1170 		len = endword - line;
1171 		if (off + len >= body_cols) {
1172 			emitline(tab, zero, &off, l, &linestart, &cont);
1173 			while (len >= body_cols) {
1174 				/* hard wrap */
1175 				emitline(tab, zero, &off, l, &linestart, &cont);
1176 				len -= body_cols-1;
1177 				line += body_cols-1;
1178 			}
1179 
1180 			if (len != 0)
1181 				off += len;
1182 		} else
1183 			off += len;
1184 
1185 		/* print the spaces iff not at bol */
1186 		len = endspc - endword;
1187 		/* line = endspc; */
1188 		if (off != zero) {
1189 			if (off + len >= body_cols) {
1190 				emitline(tab, zero, &off, l, &linestart, &cont);
1191 				linestart = endspc;
1192 			} else
1193 				off += len;
1194 		}
1195 
1196 		line = endspc;
1197 	}
1198 
1199 	emitline(tab, zero, &off, l, &linestart, &cont);
1200 }
1201 
1202 static int
1203 hardwrap_text(struct tab *tab, struct line *l)
1204 {
1205 	size_t		 off, len;
1206 	int		 cont;
1207 	const char	*linestart;
1208 
1209 	if (l->line == NULL)
1210 		return emitline(tab, 0, &off, l, &linestart, &cont);
1211 
1212         len = strlen(l->line);
1213 	off = 0;
1214 	linestart = l->line;
1215 
1216 	while (len >= COLS) {
1217 		len -= COLS-1;
1218 		off = COLS-1;
1219 		if (!emitline(tab, 0, &off, l, &linestart, &cont))
1220 			return 0;
1221 	}
1222 
1223 	if (len != 0)
1224 		return emitline(tab, 0, &len, l, &linestart, &cont);
1225 
1226 	return 1;
1227 }
1228 
1229 static int
1230 wrap_page(struct tab *tab)
1231 {
1232 	struct line	*l;
1233 	const char	*prfx;
1234 
1235 	empty_vlist(tab);
1236 
1237 	TAILQ_FOREACH(l, &tab->page.head, lines) {
1238 		prfx = line_prefixes[l->type].prfx1;
1239 		switch (l->type) {
1240 		case LINE_TEXT:
1241 		case LINE_LINK:
1242 		case LINE_TITLE_1:
1243 		case LINE_TITLE_2:
1244 		case LINE_TITLE_3:
1245 		case LINE_ITEM:
1246 		case LINE_QUOTE:
1247 			wrap_text(tab, prfx, l);
1248 			break;
1249 		case LINE_PRE_START:
1250 		case LINE_PRE_END:
1251                         push_line(tab, l, NULL, 0, 0);
1252 			break;
1253 		case LINE_PRE_CONTENT:
1254                         hardwrap_text(tab, l);
1255 			break;
1256 		}
1257 	}
1258 	return 1;
1259 }
1260 
1261 static inline void
1262 print_line(struct line *l)
1263 {
1264 	const char *text = l->line;
1265 	const char *prfx;
1266 	int face = line_faces[l->type].prop;
1267 
1268 	if (!l->flags)
1269 		prfx = line_prefixes[l->type].prfx1;
1270 	else
1271 		prfx = line_prefixes[l->type].prfx2;
1272 
1273 	if (text == NULL)
1274 		text = "";
1275 
1276 	if (face != 0)
1277 		wattron(body, face);
1278 	wprintw(body, "%s%s", prfx, text);
1279 	if (face != 0)
1280 		wattroff(body, face);
1281 }
1282 
1283 static void
1284 redraw_tabline(void)
1285 {
1286 	struct tab	*tab;
1287 	int		 current;
1288 
1289 	werase(tabline);
1290 	wbkgd(tabline, A_REVERSE);
1291 
1292 	wprintw(tabline, " ");
1293 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1294 		current = tab->flags & TAB_CURRENT;
1295 
1296 		if (current)
1297 			wattron(tabline, A_UNDERLINE);
1298 
1299 		wprintw(tabline, "%s%d:todo title ",
1300 		    current ? "*" : " ", tab->id);
1301 
1302 		if (current)
1303 			wattroff(tabline, A_UNDERLINE);
1304 	}
1305 }
1306 
1307 static void
1308 redraw_modeline(struct tab *tab)
1309 {
1310 	double		 pct;
1311 	int		 x, y, max_x, max_y;
1312 	const char	*mode = tab->page.name;
1313 	const char	*spin = "-\\|/";
1314 
1315 	werase(modeline);
1316 	wattron(modeline, A_REVERSE);
1317 	wmove(modeline, 0, 0);
1318 
1319 	wprintw(modeline, "-%c %s-mode ",
1320 	    spin[tab->s->loading_anim_step], mode);
1321 
1322 	pct = (tab->s->line_off + tab->s->curs_y) * 100.0 / tab->s->line_max;
1323 
1324 	if (tab->s->line_max <= body_lines)
1325                 wprintw(modeline, "All ");
1326 	else if (tab->s->line_off == 0)
1327                 wprintw(modeline, "Top ");
1328 	else if (tab->s->line_off + body_lines >= tab->s->line_max)
1329 		wprintw(modeline, "Bottom ");
1330 	else
1331 		wprintw(modeline, "%.0f%% ", pct);
1332 
1333 	wprintw(modeline, "%d/%d %s ",
1334 	    tab->s->line_off + tab->s->curs_y,
1335 	    tab->s->line_max,
1336 	    tab->urlstr);
1337 
1338 	getyx(modeline, y, x);
1339 	getmaxyx(modeline, max_y, max_x);
1340 
1341 	(void)y;
1342 	(void)max_y;
1343 
1344 	for (; x < max_x; ++x)
1345 		waddstr(modeline, "-");
1346 }
1347 
1348 static void
1349 redraw_minibuffer(void)
1350 {
1351 	size_t skip = 0, off_x = 0, off_y = 0;
1352 
1353 	werase(minibuf);
1354 	if (in_minibuffer) {
1355 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1356 		if (ministate.hist_cur != NULL)
1357 			wprintw(minibuf, "(%zu/%zu) ",
1358 			    ministate.hist_off + 1,
1359 			    ministate.history->len);
1360 
1361 		getyx(minibuf, off_y, off_x);
1362 
1363 		while (ministate.off - skip > COLS / 2) {
1364 			skip += MIN(ministate.off/4, 1);
1365 		}
1366 
1367 		if (ministate.hist_cur != NULL)
1368 			wprintw(minibuf, "%s", ministate.hist_cur->h + skip);
1369 		else
1370 			wprintw(minibuf, "%s", ministate.buf + skip);
1371 	}
1372 
1373 	if (ministate.curmesg != NULL) {
1374 		if (in_minibuffer)
1375 			wprintw(minibuf, "  [%s]", ministate.curmesg);
1376 		else
1377 			wprintw(minibuf, "%s", ministate.curmesg);
1378 	}
1379 
1380 	if (!in_minibuffer && ministate.curmesg == NULL)
1381 		wprintw(minibuf, "%s", keybuf);
1382 
1383 	if (in_minibuffer)
1384 		wmove(minibuf, 0, off_x + ministate.off - skip);
1385 }
1386 
1387 static void
1388 redraw_tab(struct tab *tab)
1389 {
1390 	redraw_tabline();
1391 	redraw_body(tab);
1392 	redraw_modeline(tab);
1393 	redraw_minibuffer();
1394 
1395 	restore_cursor(tab);
1396 	wrefresh(tabline);
1397 	wrefresh(modeline);
1398 
1399 	if (in_minibuffer) {
1400 		wrefresh(body);
1401 		wrefresh(minibuf);
1402 	} else {
1403 		wrefresh(minibuf);
1404 		wrefresh(body);
1405 	}
1406 }
1407 
1408 static void
1409 redraw_body(struct tab *tab)
1410 {
1411 	struct line	*l;
1412 	int		 line;
1413 
1414 	werase(body);
1415 
1416 	tab->s->line_off = MIN(tab->s->line_max, tab->s->line_off);
1417 	if (TAILQ_EMPTY(&tab->s->head))
1418 		return;
1419 
1420 	line = 0;
1421 	l = nth_line(tab, tab->s->line_off);
1422 	for (; l != NULL; l = TAILQ_NEXT(l, lines)) {
1423 		wmove(body, line, 0);
1424 		print_line(l);
1425 		line++;
1426 		if (line == body_lines)
1427 			break;
1428 	}
1429 }
1430 
1431 static void
1432 message(const char *fmt, ...)
1433 {
1434 	va_list ap;
1435 
1436 	if (clminibufev_set)
1437 		evtimer_del(&clminibufev);
1438 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1439 	evtimer_add(&clminibufev, &clminibufev_timer);
1440 	clminibufev_set = 1;
1441 
1442 	free(ministate.curmesg);
1443 
1444 	va_start(ap, fmt);
1445 	/* TODO: what to do if the allocation fails here? */
1446 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1447 		ministate.curmesg = NULL;
1448 	va_end(ap);
1449 
1450 	redraw_minibuffer();
1451 
1452 	if (in_minibuffer) {
1453 		wrefresh(body);
1454 		wrefresh(minibuf);
1455 	} else {
1456 		wrefresh(minibuf);
1457 		wrefresh(body);
1458 	}
1459 }
1460 
1461 static void
1462 start_loading_anim(struct tab *tab)
1463 {
1464 	if (tab->s->loading_anim)
1465 		return;
1466 	tab->s->loading_anim = 1;
1467 	evtimer_set(&tab->s->loadingev, update_loading_anim, tab);
1468 	evtimer_add(&tab->s->loadingev, &loadingev_timer);
1469 }
1470 
1471 static void
1472 update_loading_anim(int fd, short ev, void *d)
1473 {
1474 	struct tab	*tab = d;
1475 
1476 	tab->s->loading_anim_step = (tab->s->loading_anim_step+1)%4;
1477 
1478 	redraw_modeline(tab);
1479 	wrefresh(modeline);
1480 
1481 	wrefresh(body);
1482 	if (in_minibuffer)
1483 		wrefresh(minibuf);
1484 
1485 	evtimer_add(&tab->s->loadingev, &loadingev_timer);
1486 }
1487 
1488 static void
1489 stop_loading_anim(struct tab *tab)
1490 {
1491 	if (!tab->s->loading_anim)
1492 		return;
1493 	evtimer_del(&tab->s->loadingev);
1494 	tab->s->loading_anim = 0;
1495 	tab->s->loading_anim_step = 0;
1496 
1497 	redraw_modeline(tab);
1498 
1499 	wrefresh(modeline);
1500 	wrefresh(body);
1501 	if (in_minibuffer)
1502 		wrefresh(minibuf);
1503 }
1504 
1505 static void
1506 load_url_in_tab(struct tab *tab, const char *url)
1507 {
1508 	empty_vlist(tab);
1509 	message("Loading %s...", url);
1510 	start_loading_anim(tab);
1511 	load_url(tab, url);
1512 
1513 	tab->s->curs_x = 0;
1514 	tab->s->curs_y = 0;
1515 	redraw_tab(tab);
1516 }
1517 
1518 static void
1519 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1520     void (*abortfn)(void), struct minibuf_histhead *hist)
1521 {
1522 	in_minibuffer = 1;
1523 	base_map = &minibuffer_map;
1524 	current_map = &minibuffer_map;
1525 
1526 	base_map->unhandled_input = self_insert_fn;
1527 
1528 	ministate.donefn = donefn;
1529 	ministate.abortfn = abortfn;
1530 	memset(ministate.buf, 0, sizeof(ministate.buf));
1531         ministate.off = 0;
1532 	ministate.len = 0;
1533 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1534 
1535 	ministate.history = hist;
1536 	ministate.hist_cur = NULL;
1537 	ministate.hist_off = 0;
1538 }
1539 
1540 static void
1541 exit_minibuffer(void)
1542 {
1543 	werase(minibuf);
1544 
1545 	in_minibuffer = 0;
1546 	base_map = &global_map;
1547 	current_map = &global_map;
1548 }
1549 
1550 static void
1551 switch_to_tab(struct tab *tab)
1552 {
1553 	struct tab	*t;
1554 
1555 	TAILQ_FOREACH(t, &tabshead, tabs) {
1556 		t->flags &= ~TAB_CURRENT;
1557 	}
1558 
1559 	tab->flags |= TAB_CURRENT;
1560 }
1561 
1562 static struct tab *
1563 new_tab(void)
1564 {
1565 	struct tab	*tab, *t;
1566 	const char	*url = "about:new";
1567 
1568 	if ((tab = calloc(1, sizeof(*tab))) == NULL)
1569 		goto err;
1570 
1571 	if ((tab->s = calloc(1, sizeof(*t->s))) == NULL)
1572 		goto err;
1573 
1574 	TAILQ_INIT(&tab->s->head);
1575 
1576 	tab->id = tab_counter++;
1577 	switch_to_tab(tab);
1578 
1579 	if (TAILQ_EMPTY(&tabshead))
1580 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1581 	else
1582 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1583 
1584 	load_url_in_tab(tab, url);
1585 	return tab;
1586 
1587 err:
1588 	event_loopbreak();
1589 	return NULL;
1590 }
1591 
1592 int
1593 ui_init(void)
1594 {
1595 	setlocale(LC_ALL, "");
1596 
1597 	TAILQ_INIT(&global_map.m);
1598 	global_map.unhandled_input = global_key_unbound;
1599 
1600 	TAILQ_INIT(&minibuffer_map.m);
1601 
1602 	TAILQ_INIT(&eecmd_history.head);
1603 	TAILQ_INIT(&ir_history.head);
1604 	TAILQ_INIT(&lu_history.head);
1605 
1606 	base_map = &global_map;
1607 	current_map = &global_map;
1608 	load_default_keys();
1609 
1610 	initscr();
1611 	raw();
1612 	noecho();
1613 
1614 	nonl();
1615 	intrflush(stdscr, FALSE);
1616 
1617 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1618 		return 0;
1619 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1620 		return 0;
1621 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1622 		return 0;
1623 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1624 		return 0;
1625 
1626 	body_lines = LINES-3;
1627 	body_cols = COLS;
1628 
1629 	keypad(body, TRUE);
1630 	scrollok(body, TRUE);
1631 
1632 	/* non-blocking input */
1633 	wtimeout(body, 0);
1634 
1635 	mvwprintw(body, 0, 0, "");
1636 
1637 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1638 	event_add(&stdioev, NULL);
1639 
1640 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1641 	signal_add(&winchev, NULL);
1642 
1643 	new_tab();
1644 
1645 	return 1;
1646 }
1647 
1648 void
1649 ui_on_tab_loaded(struct tab *tab)
1650 {
1651 	stop_loading_anim(tab);
1652 	message("Loaded %s", tab->urlstr);
1653 }
1654 
1655 void
1656 ui_on_tab_refresh(struct tab *tab)
1657 {
1658 	if (!(tab->flags & TAB_CURRENT))
1659 		return;
1660 
1661 	wrap_page(tab);
1662 	redraw_tab(tab);
1663 }
1664 
1665 void
1666 ui_require_input(struct tab *tab, int hide)
1667 {
1668 	/* TODO: hard-switching to another tab is ugly */
1669 	switch_to_tab(tab);
1670 
1671 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1672 	    &ir_history);
1673 	strlcpy(ministate.prompt, "Input required: ",
1674 	    sizeof(ministate.prompt));
1675 	redraw_tab(tab);
1676 }
1677 
1678 void
1679 ui_end(void)
1680 {
1681 	endwin();
1682 }