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Date:: Sun Mar 21 13:05:58 2021 UTC
Message:: [ui] read also non-ASCII codepoints
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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 <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 int		 readkey(void);
121 static void		 dispatch_stdio(int, short, void*);
122 static void		 handle_clear_minibuf(int, short, void*);
123 static void		 handle_resize(int, short, void*);
124 static int		 wrap_page(struct tab*);
125 static void		 print_vline(struct vline*);
126 static void		 redraw_tabline(void);
127 static void		 redraw_body(struct tab*);
128 static void		 redraw_modeline(struct tab*);
129 static void		 redraw_minibuffer(void);
130 static void		 redraw_tab(struct tab*);
131 static void		 vmessage(const char*, va_list);
132 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
133 static void		 start_loading_anim(struct tab*);
134 static void		 update_loading_anim(int, short, void*);
135 static void		 stop_loading_anim(struct tab*);
136 static void		 load_url_in_tab(struct tab*, const char*);
137 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
138 static void		 exit_minibuffer(void);
139 static void		 switch_to_tab(struct tab*);
140 static struct tab	*new_tab(const char*);
141 static void		 usage(void);
142 
143 static struct { short meta; int key; uint32_t cp; } thiskey;
144 
145 static WINDOW	*tabline, *body, *modeline, *minibuf;
146 static int	 body_lines, body_cols;
147 
148 static struct event	clminibufev;
149 static struct timeval	clminibufev_timer = { 5, 0 };
150 static struct timeval	loadingev_timer = { 0, 250000 };
151 
152 static uint32_t		 tab_counter;
153 
154 static char	keybuf[64];
155 
156 struct kmap global_map,
157 	minibuffer_map,
158 	*current_map,
159 	*base_map;
160 
161 static struct histhead eecmd_history,
162 	ir_history,
163 	lu_history;
164 
165 static int	in_minibuffer;
166 
167 static struct {
168 	char	*curmesg;
169 
170 	char	 buf[1025];
171 	size_t	 off, len;
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.off = strlen(tab->hist_cur->h);
770 	ministate.len = ministate.off;
771 }
772 
773 static void
774 cmd_bookmark_page(struct tab *tab)
775 {
776 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
777 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
778 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
779 	ministate.off = strlen(tab->hist_cur->h);
780 	ministate.len = ministate.off;
781 }
782 
783 static void
784 cmd_goto_bookmarks(struct tab *tab)
785 {
786 	load_url_in_tab(tab, "about:bookmarks");
787 }
788 
789 static void
790 global_key_unbound(void)
791 {
792 	message("%s is undefined", keybuf);
793 }
794 
795 static void
796 cmd_mini_delete_char(struct tab *tab)
797 {
798 	minibuffer_taint_hist();
799 
800 	if (ministate.len == 0 || ministate.off == ministate.len)
801 		return;
802 
803 	memmove(&ministate.buf[ministate.off],
804 	    &ministate.buf[ministate.off+1],
805 	    ministate.len - ministate.off + 1);
806 	ministate.len--;
807 }
808 
809 static void
810 cmd_mini_delete_backward_char(struct tab *tab)
811 {
812 	minibuffer_taint_hist();
813 
814 	if (ministate.len == 0 || ministate.off == 0)
815 		return;
816 
817 	memmove(&ministate.buf[ministate.off-1],
818 	    &ministate.buf[ministate.off],
819 	    ministate.len - ministate.off + 1);
820 	ministate.off--;
821 	ministate.len--;
822 }
823 
824 static void
825 cmd_mini_forward_char(struct tab *tab)
826 {
827 	if (ministate.off == ministate.len)
828 		return;
829 	ministate.off++;
830 }
831 
832 static void
833 cmd_mini_backward_char(struct tab *tab)
834 {
835 	if (ministate.off == 0)
836 		return;
837 	ministate.off--;
838 }
839 
840 static void
841 cmd_mini_move_end_of_line(struct tab *tab)
842 {
843 	ministate.off = ministate.len;
844 }
845 
846 static void
847 cmd_mini_move_beginning_of_line(struct tab *tab)
848 {
849 	ministate.off = 0;
850 }
851 
852 static void
853 cmd_mini_kill_line(struct tab *tab)
854 {
855 	minibuffer_taint_hist();
856 
857         if (ministate.off == ministate.len)
858 		return;
859 	ministate.buf[ministate.off] = '\0';
860 	ministate.len -= ministate.off;
861 }
862 
863 static void
864 cmd_mini_abort(struct tab *tab)
865 {
866         ministate.abortfn();
867 }
868 
869 static void
870 cmd_mini_complete_and_exit(struct tab *tab)
871 {
872 	minibuffer_taint_hist();
873 	ministate.donefn();
874 }
875 
876 static void
877 cmd_mini_previous_history_element(struct tab *tab)
878 {
879 	if (ministate.history == NULL) {
880 		message("No history");
881 		return;
882 	}
883 
884 	if (ministate.hist_cur == NULL ||
885 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
886 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
887 		ministate.hist_off = ministate.history->len - 1;
888 		if (ministate.hist_cur == NULL)
889 			message("No prev item");
890 	} else {
891 		ministate.hist_off--;
892 	}
893 
894 	if (ministate.hist_cur != NULL) {
895 		ministate.off = 0;
896 		ministate.len = strlen(ministate.hist_cur->h);
897 	}
898 }
899 
900 static void
901 cmd_mini_next_history_element(struct tab *tab)
902 {
903 	if (ministate.history == NULL) {
904 		message("No history");
905 		return;
906 	}
907 
908 	if (ministate.hist_cur == NULL ||
909 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
910 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
911 		ministate.hist_off = 0;
912 		if (ministate.hist_cur == NULL)
913 			message("No next item");
914 	} else {
915 		ministate.hist_off++;
916 	}
917 
918 	if (ministate.hist_cur != NULL) {
919 		ministate.off = 0;
920 		ministate.len = strlen(ministate.hist_cur->h);
921 	}
922 }
923 
924 static void
925 minibuffer_hist_save_entry(void)
926 {
927 	struct hist	*hist;
928 
929 	if (ministate.history == NULL)
930 		return;
931 
932 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
933 		abort();
934 
935 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
936 
937 	if (TAILQ_EMPTY(&ministate.history->head))
938 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
939 	else
940 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
941 	ministate.history->len++;
942 }
943 
944 /*
945  * taint the minibuffer cache: if we're currently showing a history
946  * element, copy that to the current buf and reset the "history
947  * navigation" thing.
948  */
949 static void
950 minibuffer_taint_hist(void)
951 {
952 	if (ministate.hist_cur == NULL)
953 		return;
954 
955 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
956 	ministate.hist_cur = NULL;
957 }
958 
959 static void
960 minibuffer_self_insert(void)
961 {
962 	minibuffer_taint_hist();
963 
964 	if (ministate.len == sizeof(ministate.buf) -1)
965 		return;
966 
967 	/* TODO: utf8 handling! */
968 
969 	memmove(&ministate.buf[ministate.off+1],
970 	    &ministate.buf[ministate.off],
971 	    ministate.len - ministate.off + 1);
972 	ministate.buf[ministate.off] = thiskey.key;
973 	ministate.off++;
974 	ministate.len++;
975 }
976 
977 static void
978 eecmd_self_insert(void)
979 {
980 	if (thiskey.meta || isspace(thiskey.key) ||
981 	    !isgraph(thiskey.key)) {
982 		global_key_unbound();
983 		return;
984 	}
985 
986 	minibuffer_self_insert();
987 }
988 
989 static void
990 eecmd_select(void)
991 {
992 	exit_minibuffer();
993 	minibuffer_hist_save_entry();
994 	message("TODO: try to execute %s", ministate.buf);
995 }
996 
997 static void
998 ir_self_insert(void)
999 {
1000 	minibuffer_self_insert();
1001 }
1002 
1003 static void
1004 ir_select(void)
1005 {
1006 	char		 buf[1025] = {0};
1007 	struct url	 url;
1008 	struct tab	*tab;
1009 
1010 	tab = current_tab();
1011 
1012 	exit_minibuffer();
1013 	minibuffer_hist_save_entry();
1014 
1015 	/* a bit ugly but... */
1016 	memcpy(&url, &tab->url, sizeof(tab->url));
1017 	url_set_query(&url, ministate.buf);
1018 	url_unparse(&url, buf, sizeof(buf));
1019 	load_url_in_tab(tab, buf);
1020 }
1021 
1022 static void
1023 lu_self_insert(void)
1024 {
1025 	if (thiskey.meta || isspace(thiskey.key) ||
1026 	    !isgraph(thiskey.key)) {
1027 		global_key_unbound();
1028 		return;
1029 	}
1030 
1031 	minibuffer_self_insert();
1032 }
1033 
1034 static void
1035 lu_select(void)
1036 {
1037 	exit_minibuffer();
1038 	minibuffer_hist_save_entry();
1039 	load_url_in_tab(current_tab(), ministate.buf);
1040 }
1041 
1042 static void
1043 bp_select(void)
1044 {
1045 	exit_minibuffer();
1046 	if (*ministate.buf != '\0')
1047 		add_to_bookmarks(ministate.buf);
1048 	else
1049 		message("Abort.");
1050 }
1051 
1052 static struct vline *
1053 nth_line(struct tab *tab, size_t n)
1054 {
1055 	struct vline	*vl;
1056 	size_t		 i;
1057 
1058 	i = 0;
1059 	TAILQ_FOREACH(vl, &tab->s.head, vlines) {
1060 		if (i == n)
1061 			return vl;
1062 		i++;
1063 	}
1064 
1065 	/* unreachable */
1066 	abort();
1067 }
1068 
1069 static struct tab *
1070 current_tab(void)
1071 {
1072 	struct tab *t;
1073 
1074 	TAILQ_FOREACH(t, &tabshead, tabs) {
1075 		if (t->flags & TAB_CURRENT)
1076 			return t;
1077 	}
1078 
1079 	/* unreachable */
1080 	abort();
1081 }
1082 
1083 static int
1084 readkey(void)
1085 {
1086 	uint32_t state = 0;
1087 
1088 	if ((thiskey.key = wgetch(body)) == ERR)
1089 		return 0;
1090 
1091 	thiskey.meta = thiskey.key == 27;
1092 	if (thiskey.meta) {
1093 		thiskey.key = wgetch(body);
1094 		if (thiskey.key == ERR || thiskey.key == 27) {
1095 			thiskey.meta = 0;
1096 			thiskey.key = 27;
1097 		}
1098 	}
1099 
1100 	thiskey.cp = 0;
1101 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1102 		while (1) {
1103 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1104 				break;
1105 			if ((thiskey.key = wgetch(body)) == ERR) {
1106 				message("Error decoding user input");
1107 				return 0;
1108 			}
1109 		}
1110 	}
1111 
1112 	return 1;
1113 }
1114 
1115 static void
1116 dispatch_stdio(int fd, short ev, void *d)
1117 {
1118 	struct keymap	*k;
1119 	const char	*keyname;
1120 	char		 tmp[5] = {0};
1121 
1122 	if (!readkey())
1123 		return;
1124 
1125 	if (keybuf[0] != '\0')
1126 		strlcat(keybuf, " ", sizeof(keybuf));
1127 	if (thiskey.meta)
1128 		strlcat(keybuf, "M-", sizeof(keybuf));
1129 	if (thiskey.cp != 0) {
1130 		utf8_encode(thiskey.cp, tmp);
1131 		strlcat(keybuf, tmp, sizeof(keybuf));
1132 	} else {
1133 		if ((keyname = unkbd(thiskey.key)) != NULL)
1134 			strlcat(keybuf, keyname, sizeof(keybuf));
1135 		else {
1136 			tmp[0] = thiskey.key;
1137 			strlcat(keybuf, tmp, sizeof(keybuf));
1138 		}
1139 	}
1140 
1141 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1142 		if (k->meta == thiskey.meta &&
1143 		    k->key == thiskey.key) {
1144 			if (k->fn == NULL)
1145 				current_map = &k->map;
1146 			else {
1147 				current_map = base_map;
1148 				strlcpy(keybuf, "", sizeof(keybuf));
1149 				k->fn(current_tab());
1150 			}
1151 			goto done;
1152 		}
1153 	}
1154 
1155 	if (current_map->unhandled_input != NULL)
1156 		current_map->unhandled_input();
1157 	else {
1158 		global_key_unbound();
1159 	}
1160 
1161 	strlcpy(keybuf, "", sizeof(keybuf));
1162 	current_map = base_map;
1163 
1164 done:
1165 	redraw_tab(current_tab());
1166 }
1167 
1168 static void
1169 handle_clear_minibuf(int fd, short ev, void *d)
1170 {
1171 	free(ministate.curmesg);
1172 	ministate.curmesg = NULL;
1173 
1174 	redraw_minibuffer();
1175 	if (in_minibuffer) {
1176 		wrefresh(body);
1177 		wrefresh(minibuf);
1178 	} else {
1179 		wrefresh(minibuf);
1180 		wrefresh(body);
1181 	}
1182 }
1183 
1184 static void
1185 handle_resize(int sig, short ev, void *d)
1186 {
1187 	struct tab	*tab;
1188 
1189 	endwin();
1190 	refresh();
1191 	clear();
1192 
1193 	/* move and resize the windows, in reverse order! */
1194 
1195 	mvwin(minibuf, LINES-1, 0);
1196 	wresize(minibuf, 1, COLS);
1197 
1198 	mvwin(modeline, LINES-2, 0);
1199 	wresize(modeline, 1, COLS);
1200 
1201 	wresize(body, LINES-3, COLS);
1202 	body_lines = LINES-3;
1203 	body_cols = COLS;
1204 
1205 	wresize(tabline, 1, COLS);
1206 
1207 	tab = current_tab();
1208 
1209 	wrap_page(tab);
1210 	redraw_tab(tab);
1211 }
1212 
1213 static int
1214 wrap_page(struct tab *tab)
1215 {
1216 	struct line		*l;
1217 	const struct line	*orig;
1218 	struct vline		*vl;
1219 	const char		*prfx;
1220 
1221 	orig = tab->s.current_line == NULL
1222 		? NULL
1223 		: tab->s.current_line->parent;
1224 	tab->s.current_line = NULL;
1225 
1226 	tab->s.curs_y = 0;
1227 	tab->s.line_off = 0;
1228 
1229 	empty_vlist(tab);
1230 
1231 	TAILQ_FOREACH(l, &tab->page.head, lines) {
1232 		prfx = line_prefixes[l->type].prfx1;
1233 		switch (l->type) {
1234 		case LINE_TEXT:
1235 		case LINE_LINK:
1236 		case LINE_TITLE_1:
1237 		case LINE_TITLE_2:
1238 		case LINE_TITLE_3:
1239 		case LINE_ITEM:
1240 		case LINE_QUOTE:
1241 		case LINE_PRE_START:
1242 		case LINE_PRE_END:
1243 			wrap_text(tab, prfx, l, body_cols);
1244 			break;
1245 		case LINE_PRE_CONTENT:
1246                         hardwrap_text(tab, l, body_cols);
1247 			break;
1248 		}
1249 
1250 		if (orig == l && tab->s.current_line == NULL) {
1251 			tab->s.line_off = tab->s.line_max-1;
1252 			tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
1253 
1254 			while (1) {
1255 				vl = TAILQ_PREV(tab->s.current_line, vhead, vlines);
1256 				if (vl == NULL || vl->parent != orig)
1257 					break;
1258 				tab->s.current_line = vl;
1259 				tab->s.line_off--;
1260 			}
1261 		}
1262 	}
1263 
1264         if (tab->s.current_line == NULL)
1265 		tab->s.current_line = TAILQ_FIRST(&tab->s.head);
1266 
1267 	return 1;
1268 }
1269 
1270 static void
1271 print_vline(struct vline *vl)
1272 {
1273 	const char *text = vl->line;
1274 	const char *prfx;
1275 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1276 	int text_face = line_faces[vl->parent->type].text_prop;
1277 
1278 	if (!vl->flags)
1279 		prfx = line_prefixes[vl->parent->type].prfx1;
1280 	else
1281 		prfx = line_prefixes[vl->parent->type].prfx2;
1282 
1283 	if (text == NULL)
1284 		text = "";
1285 
1286 	wattron(body, prefix_face);
1287 	wprintw(body, "%s", prfx);
1288 	wattroff(body, prefix_face);
1289 
1290 	wattron(body, text_face);
1291 	wprintw(body, "%s", text);
1292 	wattroff(body, text_face);
1293 }
1294 
1295 static void
1296 redraw_tabline(void)
1297 {
1298 	struct tab	*tab;
1299 	size_t		 toskip;
1300 	int		 current, x, y, truncated;
1301 	const char	*title;
1302 	char		 buf[25];
1303 
1304 	toskip = 0;
1305 	x = 1;
1306 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1307 		x += sizeof(buf) + 1;
1308 		toskip++;
1309 		if (tab->flags & TAB_CURRENT)
1310 			break;
1311 	}
1312 	if (x < COLS-2)
1313 		toskip = 0;
1314 	else
1315 		toskip--;
1316 
1317 	werase(tabline);
1318 	wattron(tabline, tab_face.background);
1319 	wprintw(tabline, toskip == 0 ? " " : "<");
1320 	wattroff(tabline, tab_face.background);
1321 
1322 	truncated = 0;
1323 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1324 		if (truncated)
1325 			break;
1326 		if (toskip != 0) {
1327 			toskip--;
1328 			continue;
1329 		}
1330 
1331 		getyx(tabline, y, x);
1332 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1333 			truncated = 1;
1334 
1335 		current = tab->flags & TAB_CURRENT;
1336 
1337 		if (*(title = tab->page.title) == '\0')
1338 			title = tab->hist_cur->h;
1339 
1340 		strlcpy(buf, " ", sizeof(buf));
1341                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1342 			/* truncation happens */
1343 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1344 		} else {
1345 			/* pad with spaces */
1346 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1347 				/* nop */ ;
1348 		}
1349 
1350 		if (current)
1351 			wattron(tabline, tab_face.current_tab);
1352 		else
1353 			wattron(tabline, tab_face.tab);
1354 
1355 		wprintw(tabline, "%s", buf);
1356 		if (TAILQ_NEXT(tab, tabs) != NULL)
1357 			wprintw(tabline, " ");
1358 
1359 		if (current)
1360 			wattroff(tabline, tab_face.current_tab);
1361 		else
1362 			wattroff(tabline, tab_face.tab);
1363 	}
1364 
1365 	wattron(tabline, tab_face.background);
1366 	for (; x < COLS; ++x)
1367 		waddch(tabline, ' ');
1368 	if (truncated)
1369 		mvwprintw(tabline, 0, COLS-1, ">");
1370 }
1371 
1372 static inline char
1373 trust_status_char(enum trust_state ts)
1374 {
1375 	switch (ts) {
1376 	case TS_UNKNOWN:	return 'u';
1377 	case TS_UNTRUSTED:	return '!';
1378 	case TS_TRUSTED:	return 'v';
1379 	case TS_VERIFIED:	return 'V';
1380 	}
1381 }
1382 
1383 static void
1384 redraw_modeline(struct tab *tab)
1385 {
1386 	double		 pct;
1387 	int		 x, y, max_x, max_y;
1388 	const char	*mode = tab->page.name;
1389 	const char	*spin = "-\\|/";
1390 
1391 	werase(modeline);
1392 	wattron(modeline, A_REVERSE);
1393 	wmove(modeline, 0, 0);
1394 
1395 	wprintw(modeline, "-%c%c %s ",
1396 	    spin[tab->s.loading_anim_step],
1397 	    trust_status_char(tab->trust),
1398 	    mode == NULL ? "(none)" : mode);
1399 
1400 	pct = (tab->s.line_off + tab->s.curs_y) * 100.0 / tab->s.line_max;
1401 
1402 	if (tab->s.line_max <= (size_t)body_lines)
1403                 wprintw(modeline, "All ");
1404 	else if (tab->s.line_off == 0)
1405                 wprintw(modeline, "Top ");
1406 	else if (tab->s.line_off + body_lines >= tab->s.line_max)
1407 		wprintw(modeline, "Bottom ");
1408 	else
1409 		wprintw(modeline, "%.0f%% ", pct);
1410 
1411 	wprintw(modeline, "%d/%d %s ",
1412 	    tab->s.line_off + tab->s.curs_y,
1413 	    tab->s.line_max,
1414 	    tab->hist_cur->h);
1415 
1416 	getyx(modeline, y, x);
1417 	getmaxyx(modeline, max_y, max_x);
1418 
1419 	(void)y;
1420 	(void)max_y;
1421 
1422 	for (; x < max_x; ++x)
1423 		waddstr(modeline, "-");
1424 }
1425 
1426 static void
1427 redraw_minibuffer(void)
1428 {
1429 	size_t skip = 0, off_x = 0, off_y = 0;
1430 	struct tab *tab;
1431 
1432 	werase(minibuf);
1433 	if (in_minibuffer) {
1434 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1435 		if (ministate.hist_cur != NULL)
1436 			wprintw(minibuf, "(%zu/%zu) ",
1437 			    ministate.hist_off + 1,
1438 			    ministate.history->len);
1439 
1440 		getyx(minibuf, off_y, off_x);
1441 
1442 		while (ministate.off - skip > (size_t)COLS / 2) {
1443 			skip += MIN(ministate.off/4, 1);
1444 		}
1445 
1446 		if (ministate.hist_cur != NULL)
1447 			wprintw(minibuf, "%s", ministate.hist_cur->h + skip);
1448 		else
1449 			wprintw(minibuf, "%s", ministate.buf + skip);
1450 	}
1451 
1452 	if (ministate.curmesg != NULL) {
1453 		if (in_minibuffer)
1454 			wprintw(minibuf, "  [%s]", ministate.curmesg);
1455 		else
1456 			wprintw(minibuf, "%s", ministate.curmesg);
1457 	}
1458 
1459 	if (!in_minibuffer && ministate.curmesg == NULL)
1460 		wprintw(minibuf, "%s", keybuf);
1461 
1462 	/* If nothing else, show the URL at point */
1463 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1464 		tab = current_tab();
1465 		if (tab->s.current_line != NULL &&
1466 		    tab->s.current_line->parent->type == LINE_LINK)
1467 			wprintw(minibuf, "%s",
1468 			    tab->s.current_line->parent->alt);
1469 	}
1470 
1471 	if (in_minibuffer)
1472 		wmove(minibuf, 0, off_x + ministate.off - skip);
1473 }
1474 
1475 static void
1476 redraw_tab(struct tab *tab)
1477 {
1478 	redraw_tabline();
1479 	redraw_body(tab);
1480 	redraw_modeline(tab);
1481 	redraw_minibuffer();
1482 
1483 	wrefresh(tabline);
1484 	wrefresh(modeline);
1485 
1486 	if (in_minibuffer) {
1487 		wrefresh(body);
1488 		wrefresh(minibuf);
1489 	} else {
1490 		wrefresh(minibuf);
1491 		wrefresh(body);
1492 	}
1493 }
1494 
1495 static void
1496 redraw_body(struct tab *tab)
1497 {
1498 	struct vline	*vl;
1499 	int		 line;
1500 
1501 	werase(body);
1502 
1503 	tab->s.line_off = MIN(tab->s.line_max-1, tab->s.line_off);
1504 	if (TAILQ_EMPTY(&tab->s.head))
1505 		return;
1506 
1507 	line = 0;
1508 	vl = nth_line(tab, tab->s.line_off);
1509 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1510 		wmove(body, line, 0);
1511 		print_vline(vl);
1512 		line++;
1513 		if (line == body_lines)
1514 			break;
1515 	}
1516 
1517 	wmove(body, tab->s.curs_y, tab->s.curs_x);
1518 }
1519 
1520 static void
1521 vmessage(const char *fmt, va_list ap)
1522 {
1523 	if (evtimer_pending(&clminibufev, NULL))
1524 		evtimer_del(&clminibufev);
1525 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1526 	evtimer_add(&clminibufev, &clminibufev_timer);
1527 
1528 	free(ministate.curmesg);
1529 
1530 	/* TODO: what to do if the allocation fails here? */
1531 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1532 		ministate.curmesg = NULL;
1533 
1534 	redraw_minibuffer();
1535 	if (in_minibuffer) {
1536 		wrefresh(body);
1537 		wrefresh(minibuf);
1538 	} else {
1539 		wrefresh(minibuf);
1540 		wrefresh(body);
1541 	}
1542 }
1543 
1544 static void
1545 message(const char *fmt, ...)
1546 {
1547 	va_list ap;
1548 
1549 	va_start(ap, fmt);
1550 	vmessage(fmt, ap);
1551 	va_end(ap);
1552 }
1553 
1554 static void
1555 start_loading_anim(struct tab *tab)
1556 {
1557 	if (tab->s.loading_anim)
1558 		return;
1559 	tab->s.loading_anim = 1;
1560 	evtimer_set(&tab->s.loadingev, update_loading_anim, tab);
1561 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1562 }
1563 
1564 static void
1565 update_loading_anim(int fd, short ev, void *d)
1566 {
1567 	struct tab	*tab = d;
1568 
1569 	tab->s.loading_anim_step = (tab->s.loading_anim_step+1)%4;
1570 
1571 	if (tab->flags & TAB_CURRENT) {
1572 		redraw_modeline(tab);
1573 		wrefresh(modeline);
1574 		wrefresh(body);
1575 		if (in_minibuffer)
1576 			wrefresh(minibuf);
1577 	}
1578 
1579 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1580 }
1581 
1582 static void
1583 stop_loading_anim(struct tab *tab)
1584 {
1585 	if (!tab->s.loading_anim)
1586 		return;
1587 	evtimer_del(&tab->s.loadingev);
1588 	tab->s.loading_anim = 0;
1589 	tab->s.loading_anim_step = 0;
1590 
1591 	if (!(tab->flags & TAB_CURRENT))
1592 		return;
1593 
1594 	redraw_modeline(tab);
1595 
1596 	wrefresh(modeline);
1597 	wrefresh(body);
1598 	if (in_minibuffer)
1599 		wrefresh(minibuf);
1600 }
1601 
1602 static void
1603 load_url_in_tab(struct tab *tab, const char *url)
1604 {
1605 	empty_vlist(tab);
1606 	message("Loading %s...", url);
1607 	start_loading_anim(tab);
1608 	load_url(tab, url);
1609 
1610 	tab->s.curs_x = 0;
1611 	tab->s.curs_y = 0;
1612 	redraw_tab(tab);
1613 }
1614 
1615 static void
1616 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1617     void (*abortfn)(void), struct histhead *hist)
1618 {
1619 	in_minibuffer = 1;
1620 	base_map = &minibuffer_map;
1621 	current_map = &minibuffer_map;
1622 
1623 	base_map->unhandled_input = self_insert_fn;
1624 
1625 	ministate.donefn = donefn;
1626 	ministate.abortfn = abortfn;
1627 	memset(ministate.buf, 0, sizeof(ministate.buf));
1628         ministate.off = 0;
1629 	ministate.len = 0;
1630 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1631 
1632 	ministate.history = hist;
1633 	ministate.hist_cur = NULL;
1634 	ministate.hist_off = 0;
1635 }
1636 
1637 static void
1638 exit_minibuffer(void)
1639 {
1640 	werase(minibuf);
1641 
1642 	in_minibuffer = 0;
1643 	base_map = &global_map;
1644 	current_map = &global_map;
1645 }
1646 
1647 static void
1648 switch_to_tab(struct tab *tab)
1649 {
1650 	struct tab	*t;
1651 
1652 	TAILQ_FOREACH(t, &tabshead, tabs) {
1653 		t->flags &= ~TAB_CURRENT;
1654 	}
1655 
1656 	tab->flags |= TAB_CURRENT;
1657 }
1658 
1659 static struct tab *
1660 new_tab(const char *url)
1661 {
1662 	struct tab	*tab;
1663 
1664 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1665 		event_loopbreak();
1666 		return NULL;
1667 	}
1668 
1669 	TAILQ_INIT(&tab->hist.head);
1670 
1671 	TAILQ_INIT(&tab->s.head);
1672 
1673 	tab->id = tab_counter++;
1674 	switch_to_tab(tab);
1675 
1676 	if (TAILQ_EMPTY(&tabshead))
1677 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1678 	else
1679 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1680 
1681 	load_url_in_tab(tab, url);
1682 	return tab;
1683 }
1684 
1685 static void
1686 usage(void)
1687 {
1688 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1689 }
1690 
1691 int
1692 ui_init(int argc, char * const *argv)
1693 {
1694 	const char *url = NEW_TAB_URL;
1695 	int ch;
1696 
1697 	while ((ch = getopt(argc, argv, "")) != -1) {
1698 		switch (ch) {
1699 		default:
1700 			usage();
1701 			return 0;
1702 		}
1703 	}
1704 	argc -= optind;
1705 	argv += optind;
1706 
1707 	if (argc != 0)
1708 		url = argv[0];
1709 
1710 	setlocale(LC_ALL, "");
1711 
1712 	TAILQ_INIT(&global_map.m);
1713 	global_map.unhandled_input = global_key_unbound;
1714 
1715 	TAILQ_INIT(&minibuffer_map.m);
1716 
1717 	TAILQ_INIT(&eecmd_history.head);
1718 	TAILQ_INIT(&ir_history.head);
1719 	TAILQ_INIT(&lu_history.head);
1720 
1721 	base_map = &global_map;
1722 	current_map = &global_map;
1723 	load_default_keys();
1724 
1725 	initscr();
1726 	raw();
1727 	noecho();
1728 
1729 	nonl();
1730 	intrflush(stdscr, FALSE);
1731 
1732 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1733 		return 0;
1734 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1735 		return 0;
1736 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1737 		return 0;
1738 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1739 		return 0;
1740 
1741 	body_lines = LINES-3;
1742 	body_cols = COLS;
1743 
1744 	keypad(body, TRUE);
1745 	scrollok(body, TRUE);
1746 
1747 	/* non-blocking input */
1748 	wtimeout(body, 0);
1749 
1750 	mvwprintw(body, 0, 0, "");
1751 
1752 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1753 	event_add(&stdioev, NULL);
1754 
1755 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1756 	signal_add(&winchev, NULL);
1757 
1758 	new_tab(url);
1759 
1760 	return 1;
1761 }
1762 
1763 void
1764 ui_on_tab_loaded(struct tab *tab)
1765 {
1766 	stop_loading_anim(tab);
1767 	message("Loaded %s", tab->hist_cur->h);
1768 
1769 	redraw_tabline();
1770 	wrefresh(tabline);
1771 	if (in_minibuffer)
1772 		wrefresh(minibuf);
1773 	else
1774 		wrefresh(body);
1775 }
1776 
1777 void
1778 ui_on_tab_refresh(struct tab *tab)
1779 {
1780 	wrap_page(tab);
1781 	if (tab->flags & TAB_CURRENT)
1782 		redraw_tab(tab);
1783 }
1784 
1785 void
1786 ui_require_input(struct tab *tab, int hide)
1787 {
1788 	/* TODO: hard-switching to another tab is ugly */
1789 	switch_to_tab(tab);
1790 
1791 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1792 	    &ir_history);
1793 	strlcpy(ministate.prompt, "Input required: ",
1794 	    sizeof(ministate.prompt));
1795 	redraw_tab(tab);
1796 }
1797 
1798 void
1799 ui_notify(const char *fmt, ...)
1800 {
1801 	va_list ap;
1802 
1803 	va_start(ap, fmt);
1804 	vmessage(fmt, ap);
1805 	va_end(ap);
1806 }
1807 
1808 void
1809 ui_end(void)
1810 {
1811 	endwin();
1812 }