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Date:: Sat Mar 20 21:17:25 2021 UTC
Message:: fix warnings
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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 void		 dispatch_stdio(int, short, void*);
121 static void		 handle_clear_minibuf(int, short, void*);
122 static void		 handle_resize(int, short, void*);
123 static int		 wrap_page(struct tab*);
124 static void		 print_vline(struct vline*);
125 static void		 redraw_tabline(void);
126 static void		 redraw_body(struct tab*);
127 static void		 redraw_modeline(struct tab*);
128 static void		 redraw_minibuffer(void);
129 static void		 redraw_tab(struct tab*);
130 static void		 vmessage(const char*, va_list);
131 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
132 static void		 start_loading_anim(struct tab*);
133 static void		 update_loading_anim(int, short, void*);
134 static void		 stop_loading_anim(struct tab*);
135 static void		 load_url_in_tab(struct tab*, const char*);
136 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
137 static void		 exit_minibuffer(void);
138 static void		 switch_to_tab(struct tab*);
139 static struct tab	*new_tab(const char*);
140 static void		 usage(void);
141 
142 static struct { int meta, key; } thiskey;
143 
144 static WINDOW	*tabline, *body, *modeline, *minibuf;
145 static int	 body_lines, body_cols;
146 
147 static struct event	clminibufev;
148 static struct timeval	clminibufev_timer = { 5, 0 };
149 static struct timeval	loadingev_timer = { 0, 250000 };
150 
151 static uint32_t		 tab_counter;
152 
153 static char	keybuf[64];
154 
155 struct kmap global_map,
156 	minibuffer_map,
157 	*current_map,
158 	*base_map;
159 
160 static struct histhead eecmd_history,
161 	ir_history,
162 	lu_history;
163 
164 static int	in_minibuffer;
165 
166 static struct {
167 	char	*curmesg;
168 
169 	char	 buf[1025];
170 	size_t	 off, len;
171 	char	 prompt[32];
172 	void	 (*donefn)(void);
173 	void	 (*abortfn)(void);
174 
175 	struct histhead	*history;
176 	struct hist	*hist_cur;
177 	size_t			 hist_off;
178 } ministate;
179 
180 struct lineprefix {
181 	const char	*prfx1;
182 	const char	*prfx2;
183 } line_prefixes[] = {
184 	[LINE_TEXT] =		{ "",		"" },
185 	[LINE_LINK] =		{ "=> ",	"   " },
186 	[LINE_TITLE_1] =	{ "# ",		"  " },
187 	[LINE_TITLE_2] =	{ "## ",	"   " },
188 	[LINE_TITLE_3] =	{ "### ",	"    " },
189 	[LINE_ITEM] =		{ "* ",		"  " },
190 	[LINE_QUOTE] =		{ "> ",		"  " },
191 	[LINE_PRE_START] =	{ "```",	"   " },
192 	[LINE_PRE_CONTENT] =	{ "",		"" },
193 	[LINE_PRE_END] =	{ "```",	"```" },
194 };
195 
196 static struct line_face {
197 	int prefix_prop;
198 	int text_prop;
199 } line_faces[] = {
200 	[LINE_TEXT] =		{ 0,		0 },
201 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
202 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
203 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
204 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
205 	[LINE_ITEM] =		{ 0,		0 },
206 	[LINE_QUOTE] =		{ 0,		A_DIM },
207 	[LINE_PRE_START] =	{ 0,		0 },
208 	[LINE_PRE_CONTENT] =	{ 0,		0 },
209 	[LINE_PRE_END] =	{ 0,		0 },
210 };
211 
212 static struct tab_face {
213 	int background, tab, current_tab;
214 } tab_face = {
215 	A_REVERSE, A_REVERSE, A_NORMAL
216 };
217 
218 static void
219 empty_vlist(struct tab *tab)
220 {
221 	struct vline *vl, *t;
222 
223 	tab->s.current_line = NULL;
224 	tab->s.line_max = 0;
225 
226 	TAILQ_FOREACH_SAFE(vl, &tab->s.head, vlines, t) {
227 		TAILQ_REMOVE(&tab->s.head, vl, vlines);
228 		free(vl->line);
229 		free(vl);
230 	}
231 }
232 
233 static inline void
234 global_set_key(const char *key, void (*fn)(struct tab*))
235 {
236 	if (!kmap_define_key(&global_map, key, fn))
237 		_exit(1);
238 }
239 
240 static inline void
241 minibuffer_set_key(const char *key, void (*fn)(struct tab*))
242 {
243 	if (!kmap_define_key(&minibuffer_map, key, fn))
244 		_exit(1);
245 }
246 
247 static void
248 load_default_keys(void)
249 {
250 	/* === global map === */
251 
252 	/* emacs */
253 	global_set_key("C-p",		cmd_previous_line);
254 	global_set_key("C-n",		cmd_next_line);
255 	global_set_key("C-f",		cmd_forward_char);
256 	global_set_key("C-b",		cmd_backward_char);
257 	global_set_key("M-{",		cmd_backward_paragraph);
258 	global_set_key("M-}",		cmd_forward_paragraph);
259 	global_set_key("C-a",		cmd_move_beginning_of_line);
260 	global_set_key("C-e",		cmd_move_end_of_line);
261 
262 	global_set_key("M-v",		cmd_scroll_up);
263 	global_set_key("C-v",		cmd_scroll_down);
264 	global_set_key("M-space",	cmd_scroll_up);
265 	global_set_key("space",		cmd_scroll_down);
266 
267 	global_set_key("C-x C-c",	cmd_kill_telescope);
268 
269 	global_set_key("C-g",		cmd_clear_minibuf);
270 
271 	global_set_key("M-x",		cmd_execute_extended_command);
272 	global_set_key("C-x C-f",	cmd_load_url);
273 	global_set_key("C-x M-f",	cmd_load_current_url);
274 
275 	global_set_key("C-x t 0",	cmd_tab_close);
276 	global_set_key("C-x t 1",	cmd_tab_close_other);
277 	global_set_key("C-x t 2",	cmd_tab_new);
278 	global_set_key("C-x t o",	cmd_tab_next);
279 	global_set_key("C-x t O",	cmd_tab_previous);
280 
281 	global_set_key("M-<",		cmd_beginning_of_buffer);
282 	global_set_key("M->",		cmd_end_of_buffer);
283 
284 	global_set_key("C-M-b",		cmd_previous_page);
285 	global_set_key("C-M-f",		cmd_next_page);
286 
287 	global_set_key("<f7> a",	cmd_bookmark_page);
288 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
289 
290 	/* vi/vi-like */
291 	global_set_key("k",		cmd_previous_line);
292 	global_set_key("j",		cmd_next_line);
293 	global_set_key("l",		cmd_forward_char);
294 	global_set_key("h",		cmd_backward_char);
295 	global_set_key("{",		cmd_backward_paragraph);
296 	global_set_key("}",		cmd_forward_paragraph);
297 	global_set_key("^",		cmd_move_beginning_of_line);
298 	global_set_key("$",		cmd_move_end_of_line);
299 
300 	global_set_key("K",		cmd_scroll_line_up);
301 	global_set_key("J",		cmd_scroll_line_down);
302 
303 	global_set_key("g D",		cmd_tab_close);
304 	global_set_key("g N",		cmd_tab_new);
305 	global_set_key("g t",		cmd_tab_next);
306 	global_set_key("g T",		cmd_tab_previous);
307 
308 	global_set_key("g g",		cmd_beginning_of_buffer);
309 	global_set_key("G",		cmd_end_of_buffer);
310 
311 	global_set_key("H",		cmd_previous_page);
312 	global_set_key("L",		cmd_next_page);
313 
314 	/* tmp */
315 	global_set_key("q",		cmd_kill_telescope);
316 
317 	global_set_key("esc",		cmd_clear_minibuf);
318 
319 	global_set_key(":",		cmd_execute_extended_command);
320 
321 	/* cua */
322 	global_set_key("<up>",		cmd_previous_line);
323 	global_set_key("<down>",	cmd_next_line);
324 	global_set_key("<right>",	cmd_forward_char);
325 	global_set_key("<left>",	cmd_backward_char);
326 	global_set_key("<prior>",	cmd_scroll_up);
327 	global_set_key("<next>",	cmd_scroll_down);
328 
329 	global_set_key("M-<left>",	cmd_previous_page);
330 	global_set_key("M-<right>",	cmd_next_page);
331 
332 	/* "ncurses standard" */
333 	global_set_key("C-l",		cmd_redraw);
334 
335 	/* global */
336 	global_set_key("C-m",		cmd_push_button);
337 	global_set_key("M-enter",	cmd_push_button_new_tab);
338 	global_set_key("M-tab",		cmd_previous_button);
339 	global_set_key("tab",		cmd_next_button);
340 
341 	/* === minibuffer map === */
342 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
343 	minibuffer_set_key("C-g",		cmd_mini_abort);
344 	minibuffer_set_key("esc",		cmd_mini_abort);
345 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
346 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
347 
348 	minibuffer_set_key("C-f",		cmd_mini_forward_char);
349 	minibuffer_set_key("C-b",		cmd_mini_backward_char);
350 	minibuffer_set_key("<right>",		cmd_mini_forward_char);
351 	minibuffer_set_key("<left>",		cmd_mini_backward_char);
352 	minibuffer_set_key("C-e",		cmd_mini_move_end_of_line);
353 	minibuffer_set_key("C-a",		cmd_mini_move_beginning_of_line);
354 	minibuffer_set_key("<end>",		cmd_mini_move_end_of_line);
355 	minibuffer_set_key("<home>",		cmd_mini_move_beginning_of_line);
356 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
357 
358 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
359 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
360 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
361 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
362 }
363 
364 static void
365 restore_cursor(struct tab *tab)
366 {
367 	struct vline	*vl;
368 	const char	*prfx;
369 
370 	vl =tab->s.current_line;
371 	if (vl == NULL || vl->line == NULL)
372 		tab->s.curs_x = tab->s.line_x = 0;
373 	else
374 		tab->s.line_x = MIN(tab->s.line_x, strlen(vl->line));
375 
376 	if (vl != NULL) {
377 		prfx = line_prefixes[vl->parent->type].prfx1;
378 		tab->s.curs_x = tab->s.line_x + strlen(prfx);
379 	}
380 
381 	wmove(body, tab->s.curs_y, tab->s.curs_x);
382 }
383 
384 static void
385 cmd_previous_line(struct tab *tab)
386 {
387 	struct vline	*vl;
388 
389 	if (tab->s.current_line == NULL
390 	    || (vl = TAILQ_PREV(tab->s.current_line, vhead, vlines)) == NULL)
391 		return;
392 
393 	if (--tab->s.curs_y < 0) {
394 		tab->s.curs_y = 0;
395 		cmd_scroll_line_up(tab);
396 		return;
397 	}
398 
399 	tab->s.current_line = vl;
400 	restore_cursor(tab);
401 }
402 
403 static void
404 cmd_next_line(struct tab *tab)
405 {
406 	struct vline	*vl;
407 
408 	if (tab->s.current_line == NULL
409 	    || (vl = TAILQ_NEXT(tab->s.current_line, vlines)) == NULL)
410 		return;
411 
412 	if (++tab->s.curs_y > body_lines-1) {
413 		tab->s.curs_y = body_lines-1;
414 		cmd_scroll_line_down(tab);
415 		return;
416 	}
417 
418 	tab->s.current_line = vl;
419 	restore_cursor(tab);
420 }
421 
422 static void
423 cmd_backward_char(struct tab *tab)
424 {
425 	if (tab->s.line_x != 0)
426 		tab->s.line_x--;
427 	restore_cursor(tab);
428 }
429 
430 static void
431 cmd_forward_char(struct tab *tab)
432 {
433 	tab->s.line_x++;
434 	restore_cursor(tab);
435 }
436 
437 static void
438 cmd_backward_paragraph(struct tab *tab)
439 {
440 	do {
441 		if (tab->s.current_line == NULL ||
442 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
443 			message("No previous paragraph");
444 			return;
445 		}
446 		cmd_previous_line(tab);
447 	} while (tab->s.current_line->line != NULL ||
448 	    tab->s.current_line->parent->type != LINE_TEXT);
449 }
450 
451 static void
452 cmd_forward_paragraph(struct tab *tab)
453 {
454 	do {
455 		if (tab->s.current_line == NULL ||
456 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
457 			message("No next paragraph");
458 			return;
459 		}
460 		cmd_next_line(tab);
461 	} while (tab->s.current_line->line != NULL ||
462 	    tab->s.current_line->parent->type != LINE_TEXT);
463 }
464 
465 static void
466 cmd_move_beginning_of_line(struct tab *tab)
467 {
468 	tab->s.line_x = 0;
469 	restore_cursor(tab);
470 }
471 
472 static void
473 cmd_move_end_of_line(struct tab *tab)
474 {
475 	struct vline	*vl;
476 
477 	vl = tab->s.current_line;
478 	if (vl->line == NULL)
479 		return;
480 	tab->s.line_x = body_cols;
481 	restore_cursor(tab);
482 }
483 
484 static void
485 cmd_redraw(struct tab *tab)
486 {
487 	handle_resize(0, 0, NULL);
488 }
489 
490 static void
491 cmd_scroll_line_up(struct tab *tab)
492 {
493 	struct vline	*vl;
494 
495 	if (tab->s.line_off == 0)
496 		return;
497 
498 	vl = nth_line(tab, --tab->s.line_off);
499 	wscrl(body, -1);
500 	wmove(body, 0, 0);
501 	print_vline(vl);
502 
503 	tab->s.current_line = TAILQ_PREV(tab->s.current_line, vhead, vlines);
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 
527 static void
528 cmd_scroll_up(struct tab *tab)
529 {
530 	size_t off;
531 
532 	off = body_lines+1;
533 
534 	for (; off > 0; --off)
535 		cmd_scroll_line_up(tab);
536 }
537 
538 static void
539 cmd_scroll_down(struct tab *tab)
540 {
541 	size_t off;
542 
543 	off = body_lines+1;
544 
545 	for (; off > 0; --off)
546 		cmd_scroll_line_down(tab);
547 }
548 
549 static void
550 cmd_beginning_of_buffer(struct tab *tab)
551 {
552 	tab->s.current_line = TAILQ_FIRST(&tab->s.head);
553 	tab->s.line_off = 0;
554 	tab->s.curs_y = 0;
555 	tab->s.line_x = 0;
556 	restore_cursor(tab);
557 	redraw_body(tab);
558 }
559 
560 static void
561 cmd_end_of_buffer(struct tab *tab)
562 {
563 	ssize_t off;
564 
565 	off = tab->s.line_max - body_lines;
566 	off = MAX(0, off);
567 
568 	tab->s.line_off = off;
569 	tab->s.curs_y = MIN((size_t)body_lines, tab->s.line_max-1);
570 
571 	tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
572 	tab->s.line_x = body_cols;
573 	restore_cursor(tab);
574 	redraw_body(tab);
575 }
576 
577 static void
578 cmd_kill_telescope(struct tab *tab)
579 {
580 	event_loopbreak();
581 }
582 
583 static void
584 cmd_push_button(struct tab *tab)
585 {
586 	struct vline	*vl;
587 	size_t		 nth;
588 
589 	nth = tab->s.line_off + tab->s.curs_y;
590 	if (nth >= tab->s.line_max)
591 		return;
592 	vl = nth_line(tab, nth);
593 	if (vl->parent->type != LINE_LINK)
594 		return;
595 
596 	load_url_in_tab(tab, vl->parent->alt);
597 }
598 
599 static void
600 cmd_push_button_new_tab(struct tab *tab)
601 {
602 	struct vline	*vl;
603 	size_t		 nth;
604 
605 	nth = tab->s.line_off + tab->s.curs_y;
606 	if (nth > tab->s.line_max)
607 		return;
608 	vl = nth_line(tab, nth);
609 	if (vl->parent->type != LINE_LINK)
610 		return;
611 
612 	new_tab(vl->parent->alt);
613 }
614 
615 static void
616 cmd_previous_button(struct tab *tab)
617 {
618 	do {
619 		if (tab->s.current_line == NULL ||
620 		    tab->s.current_line == TAILQ_FIRST(&tab->s.head)) {
621 			message("No previous link");
622 			return;
623 		}
624 		cmd_previous_line(tab);
625 	} while (tab->s.current_line->parent->type != LINE_LINK);
626 }
627 
628 static void
629 cmd_next_button(struct tab *tab)
630 {
631 	do {
632 		if (tab->s.current_line == NULL ||
633 		    tab->s.current_line == TAILQ_LAST(&tab->s.head, vhead)) {
634 			message("No next link");
635 			return;
636 		}
637 		cmd_next_line(tab);
638 	} while (tab->s.current_line->parent->type != LINE_LINK);
639 }
640 
641 static void
642 cmd_previous_page(struct tab *tab)
643 {
644 	if (!load_previous_page(tab))
645 		message("No previous page");
646 	else
647 		start_loading_anim(tab);
648 }
649 
650 static void
651 cmd_next_page(struct tab *tab)
652 {
653 	if (!load_next_page(tab))
654 		message("No next page");
655 	else
656 		start_loading_anim(tab);
657 }
658 
659 static void
660 cmd_clear_minibuf(struct tab *tab)
661 {
662 	handle_clear_minibuf(0, 0, NULL);
663 }
664 
665 static void
666 cmd_execute_extended_command(struct tab *tab)
667 {
668 	size_t	 len;
669 
670 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
671 	    &eecmd_history);
672 
673 	len = sizeof(ministate.prompt);
674 	strlcpy(ministate.prompt, "", len);
675 
676 	if (thiskey.meta)
677 		strlcat(ministate.prompt, "M-", len);
678 
679 	strlcat(ministate.prompt, keyname(thiskey.key), len);
680 	strlcat(ministate.prompt, " ", len);
681 }
682 
683 static void
684 cmd_tab_close(struct tab *tab)
685 {
686 	struct tab *t;
687 
688 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
689 	    TAILQ_NEXT(tab, tabs) == NULL) {
690 		message("Can't close the only tab.");
691 		return;
692 	}
693 
694 	if (evtimer_pending(&tab->s.loadingev, NULL))
695 		evtimer_del(&tab->s.loadingev);
696 
697 	stop_tab(tab);
698 
699 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
700 		t = TAILQ_NEXT(tab, tabs);
701 	TAILQ_REMOVE(&tabshead, tab, tabs);
702 	free(tab);
703 
704 	switch_to_tab(t);
705 }
706 
707 static void
708 cmd_tab_close_other(struct tab *tab)
709 {
710 	struct tab *t, *i;
711 
712 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
713 		if (t->flags & TAB_CURRENT)
714 			continue;
715 
716 		stop_tab(t);
717 		TAILQ_REMOVE(&tabshead, t, tabs);
718 		free(t);
719 	}
720 }
721 
722 static void
723 cmd_tab_new(struct tab *tab)
724 {
725 	new_tab(NEW_TAB_URL);
726 }
727 
728 static void
729 cmd_tab_next(struct tab *tab)
730 {
731 	struct tab *t;
732 
733 	tab->flags &= ~TAB_CURRENT;
734 
735 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
736 		t = TAILQ_FIRST(&tabshead);
737 	t->flags |= TAB_CURRENT;
738 }
739 
740 static void
741 cmd_tab_previous(struct tab *tab)
742 {
743 	struct tab *t;
744 
745 	tab->flags &= ~TAB_CURRENT;
746 
747 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
748 		t = TAILQ_LAST(&tabshead, tabshead);
749 	t->flags |= TAB_CURRENT;
750 }
751 
752 static void
753 cmd_load_url(struct tab *tab)
754 {
755 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
756 	    &lu_history);
757 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
758 }
759 
760 static void
761 cmd_load_current_url(struct tab *tab)
762 {
763 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
764 	    &lu_history);
765 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
766 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
767 	ministate.off = strlen(tab->hist_cur->h);
768 	ministate.len = ministate.off;
769 }
770 
771 static void
772 cmd_bookmark_page(struct tab *tab)
773 {
774 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
775 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
776 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
777 	ministate.off = strlen(tab->hist_cur->h);
778 	ministate.len = ministate.off;
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 	minibuffer_taint_hist();
797 
798 	if (ministate.len == 0 || ministate.off == ministate.len)
799 		return;
800 
801 	memmove(&ministate.buf[ministate.off],
802 	    &ministate.buf[ministate.off+1],
803 	    ministate.len - ministate.off + 1);
804 	ministate.len--;
805 }
806 
807 static void
808 cmd_mini_delete_backward_char(struct tab *tab)
809 {
810 	minibuffer_taint_hist();
811 
812 	if (ministate.len == 0 || ministate.off == 0)
813 		return;
814 
815 	memmove(&ministate.buf[ministate.off-1],
816 	    &ministate.buf[ministate.off],
817 	    ministate.len - ministate.off + 1);
818 	ministate.off--;
819 	ministate.len--;
820 }
821 
822 static void
823 cmd_mini_forward_char(struct tab *tab)
824 {
825 	if (ministate.off == ministate.len)
826 		return;
827 	ministate.off++;
828 }
829 
830 static void
831 cmd_mini_backward_char(struct tab *tab)
832 {
833 	if (ministate.off == 0)
834 		return;
835 	ministate.off--;
836 }
837 
838 static void
839 cmd_mini_move_end_of_line(struct tab *tab)
840 {
841 	ministate.off = ministate.len;
842 }
843 
844 static void
845 cmd_mini_move_beginning_of_line(struct tab *tab)
846 {
847 	ministate.off = 0;
848 }
849 
850 static void
851 cmd_mini_kill_line(struct tab *tab)
852 {
853 	minibuffer_taint_hist();
854 
855         if (ministate.off == ministate.len)
856 		return;
857 	ministate.buf[ministate.off] = '\0';
858 	ministate.len -= ministate.off;
859 }
860 
861 static void
862 cmd_mini_abort(struct tab *tab)
863 {
864         ministate.abortfn();
865 }
866 
867 static void
868 cmd_mini_complete_and_exit(struct tab *tab)
869 {
870 	minibuffer_taint_hist();
871 	ministate.donefn();
872 }
873 
874 static void
875 cmd_mini_previous_history_element(struct tab *tab)
876 {
877 	if (ministate.history == NULL) {
878 		message("No history");
879 		return;
880 	}
881 
882 	if (ministate.hist_cur == NULL ||
883 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
884 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
885 		ministate.hist_off = ministate.history->len - 1;
886 		if (ministate.hist_cur == NULL)
887 			message("No prev item");
888 	} else {
889 		ministate.hist_off--;
890 	}
891 
892 	if (ministate.hist_cur != NULL) {
893 		ministate.off = 0;
894 		ministate.len = strlen(ministate.hist_cur->h);
895 	}
896 }
897 
898 static void
899 cmd_mini_next_history_element(struct tab *tab)
900 {
901 	if (ministate.history == NULL) {
902 		message("No history");
903 		return;
904 	}
905 
906 	if (ministate.hist_cur == NULL ||
907 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
908 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
909 		ministate.hist_off = 0;
910 		if (ministate.hist_cur == NULL)
911 			message("No next item");
912 	} else {
913 		ministate.hist_off++;
914 	}
915 
916 	if (ministate.hist_cur != NULL) {
917 		ministate.off = 0;
918 		ministate.len = strlen(ministate.hist_cur->h);
919 	}
920 }
921 
922 static void
923 minibuffer_hist_save_entry(void)
924 {
925 	struct hist	*hist;
926 
927 	if (ministate.history == NULL)
928 		return;
929 
930 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
931 		abort();
932 
933 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
934 
935 	if (TAILQ_EMPTY(&ministate.history->head))
936 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
937 	else
938 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
939 	ministate.history->len++;
940 }
941 
942 /*
943  * taint the minibuffer cache: if we're currently showing a history
944  * element, copy that to the current buf and reset the "history
945  * navigation" thing.
946  */
947 static void
948 minibuffer_taint_hist(void)
949 {
950 	if (ministate.hist_cur == NULL)
951 		return;
952 
953 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
954 	ministate.hist_cur = NULL;
955 }
956 
957 static void
958 minibuffer_self_insert(void)
959 {
960 	minibuffer_taint_hist();
961 
962 	if (ministate.len == sizeof(ministate.buf) -1)
963 		return;
964 
965 	/* TODO: utf8 handling! */
966 
967 	memmove(&ministate.buf[ministate.off+1],
968 	    &ministate.buf[ministate.off],
969 	    ministate.len - ministate.off + 1);
970 	ministate.buf[ministate.off] = thiskey.key;
971 	ministate.off++;
972 	ministate.len++;
973 }
974 
975 static void
976 eecmd_self_insert(void)
977 {
978 	if (thiskey.meta || isspace(thiskey.key) ||
979 	    !isgraph(thiskey.key)) {
980 		global_key_unbound();
981 		return;
982 	}
983 
984 	minibuffer_self_insert();
985 }
986 
987 static void
988 eecmd_select(void)
989 {
990 	exit_minibuffer();
991 	minibuffer_hist_save_entry();
992 	message("TODO: try to execute %s", ministate.buf);
993 }
994 
995 static void
996 ir_self_insert(void)
997 {
998 	minibuffer_self_insert();
999 }
1000 
1001 static void
1002 ir_select(void)
1003 {
1004 	char		 buf[1025] = {0};
1005 	struct url	 url;
1006 	struct tab	*tab;
1007 
1008 	tab = current_tab();
1009 
1010 	exit_minibuffer();
1011 	minibuffer_hist_save_entry();
1012 
1013 	/* a bit ugly but... */
1014 	memcpy(&url, &tab->url, sizeof(tab->url));
1015 	url_set_query(&url, ministate.buf);
1016 	url_unparse(&url, buf, sizeof(buf));
1017 	load_url_in_tab(tab, buf);
1018 }
1019 
1020 static void
1021 lu_self_insert(void)
1022 {
1023 	if (thiskey.meta || isspace(thiskey.key) ||
1024 	    !isgraph(thiskey.key)) {
1025 		global_key_unbound();
1026 		return;
1027 	}
1028 
1029 	minibuffer_self_insert();
1030 }
1031 
1032 static void
1033 lu_select(void)
1034 {
1035 	exit_minibuffer();
1036 	minibuffer_hist_save_entry();
1037 	load_url_in_tab(current_tab(), ministate.buf);
1038 }
1039 
1040 static void
1041 bp_select(void)
1042 {
1043 	exit_minibuffer();
1044 	if (*ministate.buf != '\0')
1045 		add_to_bookmarks(ministate.buf);
1046 	else
1047 		message("Abort.");
1048 }
1049 
1050 static struct vline *
1051 nth_line(struct tab *tab, size_t n)
1052 {
1053 	struct vline	*vl;
1054 	size_t		 i;
1055 
1056 	i = 0;
1057 	TAILQ_FOREACH(vl, &tab->s.head, vlines) {
1058 		if (i == n)
1059 			return vl;
1060 		i++;
1061 	}
1062 
1063 	/* unreachable */
1064 	abort();
1065 }
1066 
1067 static struct tab *
1068 current_tab(void)
1069 {
1070 	struct tab *t;
1071 
1072 	TAILQ_FOREACH(t, &tabshead, tabs) {
1073 		if (t->flags & TAB_CURRENT)
1074 			return t;
1075 	}
1076 
1077 	/* unreachable */
1078 	abort();
1079 }
1080 
1081 static void
1082 dispatch_stdio(int fd, short ev, void *d)
1083 {
1084 	struct keymap	*k;
1085 	const char	*keyname;
1086 	char		 tmp[2] = {0};
1087 
1088 	thiskey.key = wgetch(body);
1089 	if (thiskey.key == ERR)
1090 		return;
1091 	if (thiskey.key == 27) {
1092 		/* TODO: make escape-time customizable */
1093 
1094 		thiskey.meta = 1;
1095 		thiskey.key = wgetch(body);
1096 		if (thiskey.key == ERR || thiskey.key == 27) {
1097 			thiskey.meta = 0;
1098 			thiskey.key = 27;
1099 		}
1100 	} else
1101 		thiskey.meta = 0;
1102 
1103 	if (keybuf[0] != '\0')
1104 		strlcat(keybuf, " ", sizeof(keybuf));
1105 	if (thiskey.meta)
1106 		strlcat(keybuf, "M-", sizeof(keybuf));
1107 	if ((keyname = unkbd(thiskey.key)) != NULL)
1108 		strlcat(keybuf, keyname, sizeof(keybuf));
1109 	else {
1110 		tmp[0] = thiskey.key;
1111 		strlcat(keybuf, tmp, sizeof(keybuf));
1112 	}
1113 
1114 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1115 		if (k->meta == thiskey.meta &&
1116 		    k->key == thiskey.key) {
1117 			if (k->fn == NULL)
1118 				current_map = &k->map;
1119 			else {
1120 				current_map = base_map;
1121 				strlcpy(keybuf, "", sizeof(keybuf));
1122 				k->fn(current_tab());
1123 			}
1124 			goto done;
1125 		}
1126 	}
1127 
1128 	if (current_map->unhandled_input != NULL)
1129 		current_map->unhandled_input();
1130 	else {
1131 		global_key_unbound();
1132 	}
1133 
1134 	strlcpy(keybuf, "", sizeof(keybuf));
1135 	current_map = base_map;
1136 
1137 done:
1138 	redraw_tab(current_tab());
1139 }
1140 
1141 static void
1142 handle_clear_minibuf(int fd, short ev, void *d)
1143 {
1144 	free(ministate.curmesg);
1145 	ministate.curmesg = NULL;
1146 
1147 	redraw_minibuffer();
1148 	if (in_minibuffer) {
1149 		wrefresh(body);
1150 		wrefresh(minibuf);
1151 	} else {
1152 		wrefresh(minibuf);
1153 		wrefresh(body);
1154 	}
1155 }
1156 
1157 static void
1158 handle_resize(int sig, short ev, void *d)
1159 {
1160 	struct tab	*tab;
1161 
1162 	endwin();
1163 	refresh();
1164 	clear();
1165 
1166 	/* move and resize the windows, in reverse order! */
1167 
1168 	mvwin(minibuf, LINES-1, 0);
1169 	wresize(minibuf, 1, COLS);
1170 
1171 	mvwin(modeline, LINES-2, 0);
1172 	wresize(modeline, 1, COLS);
1173 
1174 	wresize(body, LINES-3, COLS);
1175 	body_lines = LINES-3;
1176 	body_cols = COLS;
1177 
1178 	wresize(tabline, 1, COLS);
1179 
1180 	tab = current_tab();
1181 
1182 	wrap_page(tab);
1183 	redraw_tab(tab);
1184 }
1185 
1186 static int
1187 wrap_page(struct tab *tab)
1188 {
1189 	struct line		*l;
1190 	const struct line	*orig;
1191 	struct vline		*vl;
1192 	const char		*prfx;
1193 
1194 	orig = tab->s.current_line == NULL
1195 		? NULL
1196 		: tab->s.current_line->parent;
1197 	tab->s.current_line = NULL;
1198 
1199 	tab->s.curs_y = 0;
1200 	tab->s.line_off = 0;
1201 
1202 	empty_vlist(tab);
1203 
1204 	TAILQ_FOREACH(l, &tab->page.head, lines) {
1205 		prfx = line_prefixes[l->type].prfx1;
1206 		switch (l->type) {
1207 		case LINE_TEXT:
1208 		case LINE_LINK:
1209 		case LINE_TITLE_1:
1210 		case LINE_TITLE_2:
1211 		case LINE_TITLE_3:
1212 		case LINE_ITEM:
1213 		case LINE_QUOTE:
1214 		case LINE_PRE_START:
1215 		case LINE_PRE_END:
1216 			wrap_text(tab, prfx, l, body_cols);
1217 			break;
1218 		case LINE_PRE_CONTENT:
1219                         hardwrap_text(tab, l, body_cols);
1220 			break;
1221 		}
1222 
1223 		if (orig == l && tab->s.current_line == NULL) {
1224 			tab->s.line_off = tab->s.line_max-1;
1225 			tab->s.current_line = TAILQ_LAST(&tab->s.head, vhead);
1226 
1227 			while (1) {
1228 				vl = TAILQ_PREV(tab->s.current_line, vhead, vlines);
1229 				if (vl == NULL || vl->parent != orig)
1230 					break;
1231 				tab->s.current_line = vl;
1232 				tab->s.line_off--;
1233 			}
1234 		}
1235 	}
1236 
1237         if (tab->s.current_line == NULL)
1238 		tab->s.current_line = TAILQ_FIRST(&tab->s.head);
1239 
1240 	return 1;
1241 }
1242 
1243 static void
1244 print_vline(struct vline *vl)
1245 {
1246 	const char *text = vl->line;
1247 	const char *prfx;
1248 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1249 	int text_face = line_faces[vl->parent->type].text_prop;
1250 
1251 	if (!vl->flags)
1252 		prfx = line_prefixes[vl->parent->type].prfx1;
1253 	else
1254 		prfx = line_prefixes[vl->parent->type].prfx2;
1255 
1256 	if (text == NULL)
1257 		text = "";
1258 
1259 	wattron(body, prefix_face);
1260 	wprintw(body, "%s", prfx);
1261 	wattroff(body, prefix_face);
1262 
1263 	wattron(body, text_face);
1264 	wprintw(body, "%s", text);
1265 	wattroff(body, text_face);
1266 }
1267 
1268 static void
1269 redraw_tabline(void)
1270 {
1271 	struct tab	*tab;
1272 	size_t		 toskip;
1273 	int		 current, x, y, truncated;
1274 	const char	*title;
1275 	char		 buf[25];
1276 
1277 	toskip = 0;
1278 	x = 1;
1279 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1280 		x += sizeof(buf) + 1;
1281 		toskip++;
1282 		if (tab->flags & TAB_CURRENT)
1283 			break;
1284 	}
1285 	if (x < COLS-2)
1286 		toskip = 0;
1287 	else
1288 		toskip--;
1289 
1290 	werase(tabline);
1291 	wattron(tabline, tab_face.background);
1292 	wprintw(tabline, toskip == 0 ? " " : "<");
1293 	wattroff(tabline, tab_face.background);
1294 
1295 	truncated = 0;
1296 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1297 		if (truncated)
1298 			break;
1299 		if (toskip != 0) {
1300 			toskip--;
1301 			continue;
1302 		}
1303 
1304 		getyx(tabline, y, x);
1305 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1306 			truncated = 1;
1307 
1308 		current = tab->flags & TAB_CURRENT;
1309 
1310 		if (*(title = tab->page.title) == '\0')
1311 			title = tab->hist_cur->h;
1312 
1313 		strlcpy(buf, " ", sizeof(buf));
1314                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1315 			/* truncation happens */
1316 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1317 		} else {
1318 			/* pad with spaces */
1319 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1320 				/* nop */ ;
1321 		}
1322 
1323 		if (current)
1324 			wattron(tabline, tab_face.current_tab);
1325 		else
1326 			wattron(tabline, tab_face.tab);
1327 
1328 		wprintw(tabline, "%s", buf);
1329 		if (TAILQ_NEXT(tab, tabs) != NULL)
1330 			wprintw(tabline, " ");
1331 
1332 		if (current)
1333 			wattroff(tabline, tab_face.current_tab);
1334 		else
1335 			wattroff(tabline, tab_face.tab);
1336 	}
1337 
1338 	wattron(tabline, tab_face.background);
1339 	for (; x < COLS; ++x)
1340 		waddch(tabline, ' ');
1341 	if (truncated)
1342 		mvwprintw(tabline, 0, COLS-1, ">");
1343 }
1344 
1345 static inline char
1346 trust_status_char(enum trust_state ts)
1347 {
1348 	switch (ts) {
1349 	case TS_UNKNOWN:	return 'u';
1350 	case TS_UNTRUSTED:	return '!';
1351 	case TS_TRUSTED:	return 'v';
1352 	case TS_VERIFIED:	return 'V';
1353 	}
1354 }
1355 
1356 static void
1357 redraw_modeline(struct tab *tab)
1358 {
1359 	double		 pct;
1360 	int		 x, y, max_x, max_y;
1361 	const char	*mode = tab->page.name;
1362 	const char	*spin = "-\\|/";
1363 
1364 	werase(modeline);
1365 	wattron(modeline, A_REVERSE);
1366 	wmove(modeline, 0, 0);
1367 
1368 	wprintw(modeline, "-%c%c %s ",
1369 	    spin[tab->s.loading_anim_step],
1370 	    trust_status_char(tab->trust),
1371 	    mode == NULL ? "(none)" : mode);
1372 
1373 	pct = (tab->s.line_off + tab->s.curs_y) * 100.0 / tab->s.line_max;
1374 
1375 	if (tab->s.line_max <= (size_t)body_lines)
1376                 wprintw(modeline, "All ");
1377 	else if (tab->s.line_off == 0)
1378                 wprintw(modeline, "Top ");
1379 	else if (tab->s.line_off + body_lines >= tab->s.line_max)
1380 		wprintw(modeline, "Bottom ");
1381 	else
1382 		wprintw(modeline, "%.0f%% ", pct);
1383 
1384 	wprintw(modeline, "%d/%d %s ",
1385 	    tab->s.line_off + tab->s.curs_y,
1386 	    tab->s.line_max,
1387 	    tab->hist_cur->h);
1388 
1389 	getyx(modeline, y, x);
1390 	getmaxyx(modeline, max_y, max_x);
1391 
1392 	(void)y;
1393 	(void)max_y;
1394 
1395 	for (; x < max_x; ++x)
1396 		waddstr(modeline, "-");
1397 }
1398 
1399 static void
1400 redraw_minibuffer(void)
1401 {
1402 	size_t skip = 0, off_x = 0, off_y = 0;
1403 	struct tab *tab;
1404 
1405 	werase(minibuf);
1406 	if (in_minibuffer) {
1407 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1408 		if (ministate.hist_cur != NULL)
1409 			wprintw(minibuf, "(%zu/%zu) ",
1410 			    ministate.hist_off + 1,
1411 			    ministate.history->len);
1412 
1413 		getyx(minibuf, off_y, off_x);
1414 
1415 		while (ministate.off - skip > (size_t)COLS / 2) {
1416 			skip += MIN(ministate.off/4, 1);
1417 		}
1418 
1419 		if (ministate.hist_cur != NULL)
1420 			wprintw(minibuf, "%s", ministate.hist_cur->h + skip);
1421 		else
1422 			wprintw(minibuf, "%s", ministate.buf + skip);
1423 	}
1424 
1425 	if (ministate.curmesg != NULL) {
1426 		if (in_minibuffer)
1427 			wprintw(minibuf, "  [%s]", ministate.curmesg);
1428 		else
1429 			wprintw(minibuf, "%s", ministate.curmesg);
1430 	}
1431 
1432 	if (!in_minibuffer && ministate.curmesg == NULL)
1433 		wprintw(minibuf, "%s", keybuf);
1434 
1435 	/* If nothing else, show the URL at point */
1436 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1437 		tab = current_tab();
1438 		if (tab->s.current_line != NULL &&
1439 		    tab->s.current_line->parent->type == LINE_LINK)
1440 			wprintw(minibuf, "%s",
1441 			    tab->s.current_line->parent->alt);
1442 	}
1443 
1444 	if (in_minibuffer)
1445 		wmove(minibuf, 0, off_x + ministate.off - skip);
1446 }
1447 
1448 static void
1449 redraw_tab(struct tab *tab)
1450 {
1451 	redraw_tabline();
1452 	redraw_body(tab);
1453 	redraw_modeline(tab);
1454 	redraw_minibuffer();
1455 
1456 	restore_cursor(tab);
1457 	wrefresh(tabline);
1458 	wrefresh(modeline);
1459 
1460 	if (in_minibuffer) {
1461 		wrefresh(body);
1462 		wrefresh(minibuf);
1463 	} else {
1464 		wrefresh(minibuf);
1465 		wrefresh(body);
1466 	}
1467 }
1468 
1469 static void
1470 redraw_body(struct tab *tab)
1471 {
1472 	struct vline	*vl;
1473 	int		 line;
1474 
1475 	werase(body);
1476 
1477 	tab->s.line_off = MIN(tab->s.line_max-1, tab->s.line_off);
1478 	if (TAILQ_EMPTY(&tab->s.head))
1479 		return;
1480 
1481 	line = 0;
1482 	vl = nth_line(tab, tab->s.line_off);
1483 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1484 		wmove(body, line, 0);
1485 		print_vline(vl);
1486 		line++;
1487 		if (line == body_lines)
1488 			break;
1489 	}
1490 }
1491 
1492 static void
1493 vmessage(const char *fmt, va_list ap)
1494 {
1495 	if (evtimer_pending(&clminibufev, NULL))
1496 		evtimer_del(&clminibufev);
1497 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1498 	evtimer_add(&clminibufev, &clminibufev_timer);
1499 
1500 	free(ministate.curmesg);
1501 
1502 	/* TODO: what to do if the allocation fails here? */
1503 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1504 		ministate.curmesg = NULL;
1505 
1506 	redraw_minibuffer();
1507 	if (in_minibuffer) {
1508 		wrefresh(body);
1509 		wrefresh(minibuf);
1510 	} else {
1511 		wrefresh(minibuf);
1512 		wrefresh(body);
1513 	}
1514 }
1515 
1516 static void
1517 message(const char *fmt, ...)
1518 {
1519 	va_list ap;
1520 
1521 	va_start(ap, fmt);
1522 	vmessage(fmt, ap);
1523 	va_end(ap);
1524 }
1525 
1526 static void
1527 start_loading_anim(struct tab *tab)
1528 {
1529 	if (tab->s.loading_anim)
1530 		return;
1531 	tab->s.loading_anim = 1;
1532 	evtimer_set(&tab->s.loadingev, update_loading_anim, tab);
1533 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1534 }
1535 
1536 static void
1537 update_loading_anim(int fd, short ev, void *d)
1538 {
1539 	struct tab	*tab = d;
1540 
1541 	tab->s.loading_anim_step = (tab->s.loading_anim_step+1)%4;
1542 
1543 	if (tab->flags & TAB_CURRENT) {
1544 		redraw_modeline(tab);
1545 		wrefresh(modeline);
1546 		wrefresh(body);
1547 		if (in_minibuffer)
1548 			wrefresh(minibuf);
1549 	}
1550 
1551 	evtimer_add(&tab->s.loadingev, &loadingev_timer);
1552 }
1553 
1554 static void
1555 stop_loading_anim(struct tab *tab)
1556 {
1557 	if (!tab->s.loading_anim)
1558 		return;
1559 	evtimer_del(&tab->s.loadingev);
1560 	tab->s.loading_anim = 0;
1561 	tab->s.loading_anim_step = 0;
1562 
1563 	if (!(tab->flags & TAB_CURRENT))
1564 		return;
1565 
1566 	redraw_modeline(tab);
1567 
1568 	wrefresh(modeline);
1569 	wrefresh(body);
1570 	if (in_minibuffer)
1571 		wrefresh(minibuf);
1572 }
1573 
1574 static void
1575 load_url_in_tab(struct tab *tab, const char *url)
1576 {
1577 	empty_vlist(tab);
1578 	message("Loading %s...", url);
1579 	start_loading_anim(tab);
1580 	load_url(tab, url);
1581 
1582 	tab->s.curs_x = 0;
1583 	tab->s.curs_y = 0;
1584 	redraw_tab(tab);
1585 }
1586 
1587 static void
1588 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1589     void (*abortfn)(void), struct histhead *hist)
1590 {
1591 	in_minibuffer = 1;
1592 	base_map = &minibuffer_map;
1593 	current_map = &minibuffer_map;
1594 
1595 	base_map->unhandled_input = self_insert_fn;
1596 
1597 	ministate.donefn = donefn;
1598 	ministate.abortfn = abortfn;
1599 	memset(ministate.buf, 0, sizeof(ministate.buf));
1600         ministate.off = 0;
1601 	ministate.len = 0;
1602 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1603 
1604 	ministate.history = hist;
1605 	ministate.hist_cur = NULL;
1606 	ministate.hist_off = 0;
1607 }
1608 
1609 static void
1610 exit_minibuffer(void)
1611 {
1612 	werase(minibuf);
1613 
1614 	in_minibuffer = 0;
1615 	base_map = &global_map;
1616 	current_map = &global_map;
1617 }
1618 
1619 static void
1620 switch_to_tab(struct tab *tab)
1621 {
1622 	struct tab	*t;
1623 
1624 	TAILQ_FOREACH(t, &tabshead, tabs) {
1625 		t->flags &= ~TAB_CURRENT;
1626 	}
1627 
1628 	tab->flags |= TAB_CURRENT;
1629 }
1630 
1631 static struct tab *
1632 new_tab(const char *url)
1633 {
1634 	struct tab	*tab;
1635 
1636 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1637 		event_loopbreak();
1638 		return NULL;
1639 	}
1640 
1641 	TAILQ_INIT(&tab->hist.head);
1642 
1643 	TAILQ_INIT(&tab->s.head);
1644 
1645 	tab->id = tab_counter++;
1646 	switch_to_tab(tab);
1647 
1648 	if (TAILQ_EMPTY(&tabshead))
1649 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1650 	else
1651 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1652 
1653 	load_url_in_tab(tab, url);
1654 	return tab;
1655 }
1656 
1657 static void
1658 usage(void)
1659 {
1660 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1661 }
1662 
1663 int
1664 ui_init(int argc, char * const *argv)
1665 {
1666 	const char *url = NEW_TAB_URL;
1667 	int ch;
1668 
1669 	while ((ch = getopt(argc, argv, "")) != -1) {
1670 		switch (ch) {
1671 		default:
1672 			usage();
1673 			return 0;
1674 		}
1675 	}
1676 	argc -= optind;
1677 	argv += optind;
1678 
1679 	if (argc != 0)
1680 		url = argv[0];
1681 
1682 	setlocale(LC_ALL, "");
1683 
1684 	TAILQ_INIT(&global_map.m);
1685 	global_map.unhandled_input = global_key_unbound;
1686 
1687 	TAILQ_INIT(&minibuffer_map.m);
1688 
1689 	TAILQ_INIT(&eecmd_history.head);
1690 	TAILQ_INIT(&ir_history.head);
1691 	TAILQ_INIT(&lu_history.head);
1692 
1693 	base_map = &global_map;
1694 	current_map = &global_map;
1695 	load_default_keys();
1696 
1697 	initscr();
1698 	raw();
1699 	noecho();
1700 
1701 	nonl();
1702 	intrflush(stdscr, FALSE);
1703 
1704 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1705 		return 0;
1706 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1707 		return 0;
1708 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1709 		return 0;
1710 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1711 		return 0;
1712 
1713 	body_lines = LINES-3;
1714 	body_cols = COLS;
1715 
1716 	keypad(body, TRUE);
1717 	scrollok(body, TRUE);
1718 
1719 	/* non-blocking input */
1720 	wtimeout(body, 0);
1721 
1722 	mvwprintw(body, 0, 0, "");
1723 
1724 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1725 	event_add(&stdioev, NULL);
1726 
1727 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1728 	signal_add(&winchev, NULL);
1729 
1730 	new_tab(url);
1731 
1732 	return 1;
1733 }
1734 
1735 void
1736 ui_on_tab_loaded(struct tab *tab)
1737 {
1738 	stop_loading_anim(tab);
1739 	message("Loaded %s", tab->hist_cur->h);
1740 
1741 	redraw_tabline();
1742 	wrefresh(tabline);
1743 	if (in_minibuffer)
1744 		wrefresh(minibuf);
1745 	else
1746 		wrefresh(body);
1747 }
1748 
1749 void
1750 ui_on_tab_refresh(struct tab *tab)
1751 {
1752 	wrap_page(tab);
1753 	if (tab->flags & TAB_CURRENT)
1754 		redraw_tab(tab);
1755 }
1756 
1757 void
1758 ui_require_input(struct tab *tab, int hide)
1759 {
1760 	/* TODO: hard-switching to another tab is ugly */
1761 	switch_to_tab(tab);
1762 
1763 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1764 	    &ir_history);
1765 	strlcpy(ministate.prompt, "Input required: ",
1766 	    sizeof(ministate.prompt));
1767 	redraw_tab(tab);
1768 }
1769 
1770 void
1771 ui_notify(const char *fmt, ...)
1772 {
1773 	va_list ap;
1774 
1775 	va_start(ap, fmt);
1776 	vmessage(fmt, ap);
1777 	va_end(ap);
1778 }
1779 
1780 void
1781 ui_end(void)
1782 {
1783 	endwin();
1784 }