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Date:: Fri Mar 26 06:45:43 2021 UTC
Message:: implement execute-extended-command
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1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 /*
18  * Ncurses UI for telescope.
19  *
20  * Text scrolling
21  * ==============
22  *
23  * ncurses allows you to scroll a window, but when a line goes out of
24  * the visible area it's forgotten.  We keep a list of formatted lines
25  * (``visual lines'') that we know fits in the window, and draw them.
26  * This way is easy to scroll: just call wscrl and then render the
27  * first/last line!
28  *
29  * This means that on every resize we have to clear our list of lines
30  * and re-render everything.  A clever approach would be to do this
31  * ``on-demand''.
32  *
33  * TODO: make the text formatting on-demand.
34  *
35  */
36 
37 #include <telescope.h>
38 
39 #include <curses.h>
40 #include <event.h>
41 #include <locale.h>
42 #include <signal.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 
48 #define TAB_CURRENT	0x1
49 
50 #define NEW_TAB_URL	"about:new"
51 
52 static struct event	stdioev, winchev;
53 
54 static void		 load_default_keys(void);
55 static void		 empty_vlist(struct window*);
56 static void		 restore_cursor(struct window*);
57 
58 #define CMD(fnname) static void fnname(struct window *)
59 
60 CMD(cmd_previous_line);
61 CMD(cmd_next_line);
62 CMD(cmd_backward_char);
63 CMD(cmd_forward_char);
64 CMD(cmd_backward_paragraph);
65 CMD(cmd_forward_paragraph);
66 CMD(cmd_move_beginning_of_line);
67 CMD(cmd_move_end_of_line);
68 CMD(cmd_redraw);
69 CMD(cmd_scroll_line_down);
70 CMD(cmd_scroll_line_up);
71 CMD(cmd_scroll_up);
72 CMD(cmd_scroll_down);
73 CMD(cmd_beginning_of_buffer);
74 CMD(cmd_end_of_buffer);
75 CMD(cmd_kill_telescope);
76 CMD(cmd_push_button);
77 CMD(cmd_push_button_new_tab);
78 CMD(cmd_previous_button);
79 CMD(cmd_next_button);
80 CMD(cmd_previous_page);
81 CMD(cmd_next_page);
82 CMD(cmd_clear_minibuf);
83 CMD(cmd_execute_extended_command);
84 CMD(cmd_tab_close);
85 CMD(cmd_tab_close_other);
86 CMD(cmd_tab_new);
87 CMD(cmd_tab_next);
88 CMD(cmd_tab_previous);
89 CMD(cmd_load_url);
90 CMD(cmd_load_current_url);
91 CMD(cmd_bookmark_page);
92 CMD(cmd_goto_bookmarks);
93 
94 CMD(cmd_mini_delete_char);
95 CMD(cmd_mini_delete_backward_char);
96 CMD(cmd_mini_kill_line);
97 CMD(cmd_mini_abort);
98 CMD(cmd_mini_complete_and_exit);
99 CMD(cmd_mini_previous_history_element);
100 CMD(cmd_mini_next_history_element);
101 
102 #include "cmd.gen.h"
103 
104 static void		 global_key_unbound(void);
105 static void		 minibuffer_hist_save_entry(void);
106 static void		 minibuffer_taint_hist(void);
107 static void		 minibuffer_self_insert(void);
108 static void		 eecmd_self_insert(void);
109 static void		 eecmd_select(void);
110 static void		 ir_self_insert(void);
111 static void		 ir_select(void);
112 static void		 lu_self_insert(void);
113 static void		 lu_select(void);
114 static void		 bp_select(void);
115 static void		 yornp_self_insert(void);
116 static void		 yornp_abort(void);
117 
118 static struct vline	*nth_line(struct window*, size_t);
119 static struct tab	*current_tab(void);
120 static struct window	*current_window(void);
121 static int		 readkey(void);
122 static void		 dispatch_stdio(int, short, void*);
123 static void		 handle_clear_minibuf(int, short, void*);
124 static void		 handle_resize(int, short, void*);
125 static int		 wrap_page(struct window*);
126 static void		 print_vline(struct vline*);
127 static void		 redraw_tabline(void);
128 static void		 redraw_body(struct tab*);
129 static void		 redraw_modeline(struct tab*);
130 static void		 redraw_minibuffer(void);
131 static void		 redraw_tab(struct tab*);
132 static void		 vmessage(const char*, va_list);
133 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
134 static void		 start_loading_anim(struct tab*);
135 static void		 update_loading_anim(int, short, void*);
136 static void		 stop_loading_anim(struct tab*);
137 static void		 load_url_in_tab(struct tab*, const char*);
138 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
139 static void		 exit_minibuffer(void);
140 static void		 switch_to_tab(struct tab*);
141 static struct tab	*new_tab(const char*);
142 static void		 usage(void);
143 
144 static struct { short meta; int key; uint32_t cp; } thiskey;
145 
146 static WINDOW	*tabline, *body, *modeline, *minibuf;
147 static int	 body_lines, body_cols;
148 
149 static struct event	clminibufev;
150 static struct timeval	clminibufev_timer = { 5, 0 };
151 static struct timeval	loadingev_timer = { 0, 250000 };
152 
153 static uint32_t		 tab_counter;
154 
155 static char	keybuf[64];
156 
157 static void (*yornp_cb)(int, unsigned int);
158 
159 struct kmap global_map,
160 	minibuffer_map,
161 	*current_map,
162 	*base_map;
163 
164 static struct histhead eecmd_history,
165 	ir_history,
166 	lu_history;
167 
168 static int	in_minibuffer;
169 
170 static struct {
171 	char		*curmesg;
172 
173 	char		 prompt[64];
174 	void		 (*donefn)(void);
175 	void		 (*abortfn)(void);
176 
177 	char		 buf[1025];
178 	struct line	 line;
179 	struct vline	 vline;
180 	struct window	 window;
181 
182 	struct histhead	*history;
183 	struct hist	*hist_cur;
184 	size_t		 hist_off;
185 } ministate;
186 
187 struct lineprefix {
188 	const char	*prfx1;
189 	const char	*prfx2;
190 } line_prefixes[] = {
191 	[LINE_TEXT] =		{ "",		"" },
192 	[LINE_LINK] =		{ "=> ",	"   " },
193 	[LINE_TITLE_1] =	{ "# ",		"  " },
194 	[LINE_TITLE_2] =	{ "## ",	"   " },
195 	[LINE_TITLE_3] =	{ "### ",	"    " },
196 	[LINE_ITEM] =		{ "* ",		"  " },
197 	[LINE_QUOTE] =		{ "> ",		"  " },
198 	[LINE_PRE_START] =	{ "```",	"   " },
199 	[LINE_PRE_CONTENT] =	{ "",		"" },
200 	[LINE_PRE_END] =	{ "```",	"```" },
201 };
202 
203 static struct line_face {
204 	int prefix_prop;
205 	int text_prop;
206 } line_faces[] = {
207 	[LINE_TEXT] =		{ 0,		0 },
208 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
209 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
210 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
211 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
212 	[LINE_ITEM] =		{ 0,		0 },
213 	[LINE_QUOTE] =		{ 0,		A_DIM },
214 	[LINE_PRE_START] =	{ 0,		0 },
215 	[LINE_PRE_CONTENT] =	{ 0,		0 },
216 	[LINE_PRE_END] =	{ 0,		0 },
217 };
218 
219 static struct tab_face {
220 	int background, tab, current_tab;
221 } tab_face = {
222 	A_REVERSE, A_REVERSE, A_NORMAL
223 };
224 
225 static void
226 empty_vlist(struct window *window)
227 {
228 	struct vline *vl, *t;
229 
230 	window->current_line = NULL;
231 	window->line_max = 0;
232 
233 	TAILQ_FOREACH_SAFE(vl, &window->head, vlines, t) {
234 		TAILQ_REMOVE(&window->head, vl, vlines);
235 		free(vl->line);
236 		free(vl);
237 	}
238 }
239 
240 static inline void
241 global_set_key(const char *key, void (*fn)(struct window*))
242 {
243 	if (!kmap_define_key(&global_map, key, fn))
244 		_exit(1);
245 }
246 
247 static inline void
248 minibuffer_set_key(const char *key, void (*fn)(struct window*))
249 {
250 	if (!kmap_define_key(&minibuffer_map, key, fn))
251 		_exit(1);
252 }
253 
254 static void
255 load_default_keys(void)
256 {
257 	/* === global map === */
258 
259 	/* emacs */
260 	global_set_key("C-p",		cmd_previous_line);
261 	global_set_key("C-n",		cmd_next_line);
262 	global_set_key("C-f",		cmd_forward_char);
263 	global_set_key("C-b",		cmd_backward_char);
264 	global_set_key("M-{",		cmd_backward_paragraph);
265 	global_set_key("M-}",		cmd_forward_paragraph);
266 	global_set_key("C-a",		cmd_move_beginning_of_line);
267 	global_set_key("C-e",		cmd_move_end_of_line);
268 
269 	global_set_key("M-v",		cmd_scroll_up);
270 	global_set_key("C-v",		cmd_scroll_down);
271 	global_set_key("M-space",	cmd_scroll_up);
272 	global_set_key("space",		cmd_scroll_down);
273 
274 	global_set_key("C-x C-c",	cmd_kill_telescope);
275 
276 	global_set_key("C-g",		cmd_clear_minibuf);
277 
278 	global_set_key("M-x",		cmd_execute_extended_command);
279 	global_set_key("C-x C-f",	cmd_load_url);
280 	global_set_key("C-x M-f",	cmd_load_current_url);
281 
282 	global_set_key("C-x t 0",	cmd_tab_close);
283 	global_set_key("C-x t 1",	cmd_tab_close_other);
284 	global_set_key("C-x t 2",	cmd_tab_new);
285 	global_set_key("C-x t o",	cmd_tab_next);
286 	global_set_key("C-x t O",	cmd_tab_previous);
287 
288 	global_set_key("M-<",		cmd_beginning_of_buffer);
289 	global_set_key("M->",		cmd_end_of_buffer);
290 
291 	global_set_key("C-M-b",		cmd_previous_page);
292 	global_set_key("C-M-f",		cmd_next_page);
293 
294 	global_set_key("<f7> a",	cmd_bookmark_page);
295 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
296 
297 	/* vi/vi-like */
298 	global_set_key("k",		cmd_previous_line);
299 	global_set_key("j",		cmd_next_line);
300 	global_set_key("l",		cmd_forward_char);
301 	global_set_key("h",		cmd_backward_char);
302 	global_set_key("{",		cmd_backward_paragraph);
303 	global_set_key("}",		cmd_forward_paragraph);
304 	global_set_key("^",		cmd_move_beginning_of_line);
305 	global_set_key("$",		cmd_move_end_of_line);
306 
307 	global_set_key("K",		cmd_scroll_line_up);
308 	global_set_key("J",		cmd_scroll_line_down);
309 
310 	global_set_key("g D",		cmd_tab_close);
311 	global_set_key("g N",		cmd_tab_new);
312 	global_set_key("g t",		cmd_tab_next);
313 	global_set_key("g T",		cmd_tab_previous);
314 
315 	global_set_key("g g",		cmd_beginning_of_buffer);
316 	global_set_key("G",		cmd_end_of_buffer);
317 
318 	global_set_key("H",		cmd_previous_page);
319 	global_set_key("L",		cmd_next_page);
320 
321 	/* tmp */
322 	global_set_key("q",		cmd_kill_telescope);
323 
324 	global_set_key("esc",		cmd_clear_minibuf);
325 
326 	global_set_key(":",		cmd_execute_extended_command);
327 
328 	/* cua */
329 	global_set_key("<up>",		cmd_previous_line);
330 	global_set_key("<down>",	cmd_next_line);
331 	global_set_key("<right>",	cmd_forward_char);
332 	global_set_key("<left>",	cmd_backward_char);
333 	global_set_key("<prior>",	cmd_scroll_up);
334 	global_set_key("<next>",	cmd_scroll_down);
335 
336 	global_set_key("M-<left>",	cmd_previous_page);
337 	global_set_key("M-<right>",	cmd_next_page);
338 
339 	/* "ncurses standard" */
340 	global_set_key("C-l",		cmd_redraw);
341 
342 	/* global */
343 	global_set_key("C-m",		cmd_push_button);
344 	global_set_key("M-enter",	cmd_push_button_new_tab);
345 	global_set_key("M-tab",		cmd_previous_button);
346 	global_set_key("tab",		cmd_next_button);
347 
348 	/* === minibuffer map === */
349 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
350 	minibuffer_set_key("C-g",		cmd_mini_abort);
351 	minibuffer_set_key("esc",		cmd_mini_abort);
352 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
353 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
354 
355 	minibuffer_set_key("C-b",		cmd_backward_char);
356 	minibuffer_set_key("C-f",		cmd_forward_char);
357 	minibuffer_set_key("<left>",		cmd_backward_char);
358 	minibuffer_set_key("<right>",		cmd_forward_char);
359 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
360 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
361 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
362 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
363 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
364 
365 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
366 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
367 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
368 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
369 }
370 
371 static void
372 restore_cursor(struct window *window)
373 {
374 	struct vline	*vl;
375 	const char	*prfx;
376 
377 	vl = window->current_line;
378 	if (vl == NULL || vl->line == NULL)
379 		window->curs_x = window->cpoff = 0;
380 	else
381 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
382 
383 	if (vl != NULL) {
384 		prfx = line_prefixes[vl->parent->type].prfx1;
385 		window->curs_x += utf8_swidth(prfx);
386 	}
387 }
388 
389 static void
390 cmd_previous_line(struct window *window)
391 {
392 	struct vline	*vl;
393 
394 	if (window->current_line == NULL
395 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
396 		return;
397 
398 	if (--window->curs_y < 0) {
399 		window->curs_y = 0;
400 		cmd_scroll_line_up(window);
401 		return;
402 	}
403 
404 	window->current_line = vl;
405 	restore_cursor(window);
406 }
407 
408 static void
409 cmd_next_line(struct window *window)
410 {
411 	struct vline	*vl;
412 
413 	if (window->current_line == NULL
414 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
415 		return;
416 
417 	if (++window->curs_y > body_lines-1) {
418 		window->curs_y = body_lines-1;
419 		cmd_scroll_line_down(window);
420 		return;
421 	}
422 
423 	window->current_line = vl;
424 	restore_cursor(window);
425 }
426 
427 static void
428 cmd_backward_char(struct window *window)
429 {
430 	if (window->cpoff != 0)
431 		window->cpoff--;
432 	restore_cursor(window);
433 }
434 
435 static void
436 cmd_forward_char(struct window *window)
437 {
438 	window->cpoff++;
439 	restore_cursor(window);
440 }
441 
442 static void
443 cmd_backward_paragraph(struct window *window)
444 {
445 	do {
446 		if (window->current_line == NULL ||
447 		    window->current_line == TAILQ_FIRST(&window->head)) {
448 			message("No previous paragraph");
449 			return;
450 		}
451 		cmd_previous_line(window);
452 	} while (window->current_line->line != NULL ||
453 	    window->current_line->parent->type != LINE_TEXT);
454 }
455 
456 static void
457 cmd_forward_paragraph(struct window *window)
458 {
459 	do {
460 		if (window->current_line == NULL ||
461 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
462 			message("No next paragraph");
463 			return;
464 		}
465 		cmd_next_line(window);
466 	} while (window->current_line->line != NULL ||
467 	    window->current_line->parent->type != LINE_TEXT);
468 }
469 
470 static void
471 cmd_move_beginning_of_line(struct window *window)
472 {
473 	window->cpoff = 0;
474 	restore_cursor(window);
475 }
476 
477 static void
478 cmd_move_end_of_line(struct window *window)
479 {
480 	struct vline	*vl;
481 
482 	vl = window->current_line;
483 	if (vl->line == NULL)
484 		return;
485 	window->cpoff = utf8_cplen(vl->line);
486 	restore_cursor(window);
487 }
488 
489 static void
490 cmd_redraw(struct window *window)
491 {
492 	handle_resize(0, 0, NULL);
493 }
494 
495 static void
496 cmd_scroll_line_up(struct window *window)
497 {
498 	struct vline	*vl;
499 
500 	if (window->line_off == 0)
501 		return;
502 
503 	vl = nth_line(window, --window->line_off);
504 	wscrl(body, -1);
505 	wmove(body, 0, 0);
506 	print_vline(vl);
507 
508 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
509 	restore_cursor(window);
510 }
511 
512 static void
513 cmd_scroll_line_down(struct window *window)
514 {
515 	struct vline	*vl;
516 
517 	vl = window->current_line;
518 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
519 		return;
520 	window->current_line = vl;
521 
522 	window->line_off++;
523 	wscrl(body, 1);
524 
525 	if (window->line_max - window->line_off < (size_t)body_lines)
526 		return;
527 
528 	vl = nth_line(window, window->line_off + body_lines-1);
529 	wmove(body, body_lines-1, 0);
530 	print_vline(vl);
531 
532 	restore_cursor(window);
533 }
534 
535 static void
536 cmd_scroll_up(struct window *window)
537 {
538 	size_t off;
539 
540 	off = body_lines+1;
541 
542 	for (; off > 0; --off)
543 		cmd_scroll_line_up(window);
544 }
545 
546 static void
547 cmd_scroll_down(struct window *window)
548 {
549 	size_t off;
550 
551 	off = body_lines+1;
552 
553 	for (; off > 0; --off)
554 		cmd_scroll_line_down(window);
555 }
556 
557 static void
558 cmd_beginning_of_buffer(struct window *window)
559 {
560 	window->current_line = TAILQ_FIRST(&window->head);
561 	window->line_off = 0;
562 	window->curs_y = 0;
563 	window->cpoff = 0;
564 	restore_cursor(window);
565 }
566 
567 static void
568 cmd_end_of_buffer(struct window *window)
569 {
570 	ssize_t off;
571 
572 	off = window->line_max - body_lines;
573 	off = MAX(0, off);
574 
575 	window->line_off = off;
576 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
577 
578 	window->current_line = TAILQ_LAST(&window->head, vhead);
579 	window->cpoff = body_cols;
580 	restore_cursor(window);
581 }
582 
583 static void
584 cmd_kill_telescope(struct window *window)
585 {
586 	event_loopbreak();
587 }
588 
589 static void
590 cmd_push_button(struct window *window)
591 {
592 	struct vline	*vl;
593 	size_t		 nth;
594 
595 	nth = window->line_off + window->curs_y;
596 	if (nth >= window->line_max)
597 		return;
598 	vl = nth_line(window, nth);
599 	if (vl->parent->type != LINE_LINK)
600 		return;
601 
602 	load_url_in_tab(current_tab(), vl->parent->alt);
603 }
604 
605 static void
606 cmd_push_button_new_tab(struct window *window)
607 {
608 	struct vline	*vl;
609 	size_t		 nth;
610 
611 	nth = window->line_off + window->curs_y;
612 	if (nth > window->line_max)
613 		return;
614 	vl = nth_line(window, nth);
615 	if (vl->parent->type != LINE_LINK)
616 		return;
617 
618 	new_tab(vl->parent->alt);
619 }
620 
621 static void
622 cmd_previous_button(struct window *window)
623 {
624 	do {
625 		if (window->current_line == NULL ||
626 		    window->current_line == TAILQ_FIRST(&window->head)) {
627 			message("No previous link");
628 			return;
629 		}
630 		cmd_previous_line(window);
631 	} while (window->current_line->parent->type != LINE_LINK);
632 }
633 
634 static void
635 cmd_next_button(struct window *window)
636 {
637 	do {
638 		if (window->current_line == NULL ||
639 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
640 			message("No next link");
641 			return;
642 		}
643 		cmd_next_line(window);
644 	} while (window->current_line->parent->type != LINE_LINK);
645 }
646 
647 static void
648 cmd_previous_page(struct window *window)
649 {
650 	struct tab *tab = current_tab();
651 
652 	if (!load_previous_page(tab))
653 		message("No previous page");
654 	else
655 		start_loading_anim(tab);
656 }
657 
658 static void
659 cmd_next_page(struct window *window)
660 {
661 	struct tab *tab = current_tab();
662 
663 	if (!load_next_page(tab))
664 		message("No next page");
665 	else
666 		start_loading_anim(tab);
667 }
668 
669 static void
670 cmd_clear_minibuf(struct window *window)
671 {
672 	handle_clear_minibuf(0, 0, NULL);
673 }
674 
675 static void
676 cmd_execute_extended_command(struct window *window)
677 {
678 	size_t	 len;
679 
680 	if (in_minibuffer) {
681 		message("We don't have enable-recursive-minibuffers");
682 		return;
683 	}
684 
685 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
686 	    &eecmd_history);
687 
688 	len = sizeof(ministate.prompt);
689 	strlcpy(ministate.prompt, "", len);
690 
691 	if (thiskey.meta)
692 		strlcat(ministate.prompt, "M-", len);
693 
694 	strlcat(ministate.prompt, keyname(thiskey.key), len);
695 	strlcat(ministate.prompt, " ", len);
696 }
697 
698 static void
699 cmd_tab_close(struct window *window)
700 {
701 	struct tab *tab, *t;
702 
703 	tab = current_tab();
704 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
705 	    TAILQ_NEXT(tab, tabs) == NULL) {
706 		message("Can't close the only tab.");
707 		return;
708 	}
709 
710 	if (evtimer_pending(&tab->loadingev, NULL))
711 		evtimer_del(&tab->loadingev);
712 
713 	stop_tab(tab);
714 
715 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
716 		t = TAILQ_NEXT(tab, tabs);
717 	TAILQ_REMOVE(&tabshead, tab, tabs);
718 	free(tab);
719 
720 	switch_to_tab(t);
721 }
722 
723 static void
724 cmd_tab_close_other(struct window *window)
725 {
726 	struct tab *tab, *t, *i;
727 
728 	tab = current_tab();
729 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
730 		if (t->flags & TAB_CURRENT)
731 			continue;
732 
733 		stop_tab(t);
734 		TAILQ_REMOVE(&tabshead, t, tabs);
735 		free(t);
736 	}
737 }
738 
739 static void
740 cmd_tab_new(struct window *window)
741 {
742 	new_tab(NEW_TAB_URL);
743 }
744 
745 static void
746 cmd_tab_next(struct window *window)
747 {
748 	struct tab *tab, *t;
749 
750 	tab = current_tab();
751 	tab->flags &= ~TAB_CURRENT;
752 
753 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
754 		t = TAILQ_FIRST(&tabshead);
755 	t->flags |= TAB_CURRENT;
756 }
757 
758 static void
759 cmd_tab_previous(struct window *window)
760 {
761 	struct tab *tab, *t;
762 
763 	tab = current_tab();
764 	tab->flags &= ~TAB_CURRENT;
765 
766 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
767 		t = TAILQ_LAST(&tabshead, tabshead);
768 	t->flags |= TAB_CURRENT;
769 }
770 
771 static void
772 cmd_load_url(struct window *window)
773 {
774 	if (in_minibuffer) {
775 		message("We don't have enable-recursive-minibuffers");
776 		return;
777 	}
778 
779 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
780 	    &lu_history);
781 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
782 }
783 
784 static void
785 cmd_load_current_url(struct window *window)
786 {
787 	struct tab *tab = current_tab();
788 
789 	if (in_minibuffer) {
790 		message("We don't have enable-recursive-minibuffers");
791 		return;
792 	}
793 
794 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
795 	    &lu_history);
796 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
797 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
798 	ministate.window.cpoff = utf8_cplen(ministate.buf);
799 }
800 
801 static void
802 cmd_bookmark_page(struct window *window)
803 {
804 	struct tab *tab = current_tab();
805 
806 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
807 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
808 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
809 	ministate.window.cpoff = utf8_cplen(ministate.buf);
810 }
811 
812 static void
813 cmd_goto_bookmarks(struct window *window)
814 {
815 	load_url_in_tab(current_tab(), "about:bookmarks");
816 }
817 
818 static void
819 cmd_mini_delete_char(struct window *window)
820 {
821 	char *c, *n;
822 
823 	if (!in_minibuffer) {
824 		message("text is read-only");
825 		return;
826 	}
827 
828 	minibuffer_taint_hist();
829 
830 	c = utf8_nth(window->current_line->line, window->cpoff);
831 	if (*c == '\0')
832 		return;
833 	n = utf8_next_cp(c);
834 
835 	memmove(c, n, strlen(n)+1);
836 }
837 
838 static void
839 cmd_mini_delete_backward_char(struct window *window)
840 {
841 	char *c, *p, *start;
842 
843 	if (!in_minibuffer) {
844 		message("text is read-only");
845 		return;
846 	}
847 
848 	minibuffer_taint_hist();
849 
850 	c = utf8_nth(window->current_line->line, window->cpoff);
851 	start = window->current_line->line;
852 	if (c == start)
853 		return;
854 	p = utf8_prev_cp(c-1, start);
855 
856 	memmove(p, c, strlen(c)+1);
857 	window->cpoff--;
858 }
859 
860 static void
861 cmd_mini_kill_line(struct window *window)
862 {
863 	char *c;
864 
865 	if (!in_minibuffer) {
866 		message("text is read-only");
867 		return;
868 	}
869 
870 	minibuffer_taint_hist();
871 	c = utf8_nth(window->current_line->line, window->cpoff);
872 	*c = '\0';
873 }
874 
875 static void
876 cmd_mini_abort(struct window *window)
877 {
878 	if (!in_minibuffer)
879 		return;
880 
881 	ministate.abortfn();
882 }
883 
884 static void
885 cmd_mini_complete_and_exit(struct window *window)
886 {
887 	if (!in_minibuffer)
888 		return;
889 
890 	minibuffer_taint_hist();
891 	ministate.donefn();
892 }
893 
894 static void
895 cmd_mini_previous_history_element(struct window *window)
896 {
897 	if (ministate.history == NULL) {
898 		message("No history");
899 		return;
900 	}
901 
902 	if (ministate.hist_cur == NULL ||
903 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
904 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
905 		ministate.hist_off = ministate.history->len - 1;
906 		if (ministate.hist_cur == NULL)
907 			message("No prev item");
908 	} else {
909 		ministate.hist_off--;
910 	}
911 
912 	if (ministate.hist_cur != NULL)
913 		window->current_line->line = ministate.hist_cur->h;
914 }
915 
916 static void
917 cmd_mini_next_history_element(struct window *window)
918 {
919 	if (ministate.history == NULL) {
920 		message("No history");
921 		return;
922 	}
923 
924 	if (ministate.hist_cur == NULL ||
925 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
926 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
927 		ministate.hist_off = 0;
928 		if (ministate.hist_cur == NULL)
929 			message("No next item");
930 	} else {
931 		ministate.hist_off++;
932 	}
933 
934 	if (ministate.hist_cur != NULL)
935 		window->current_line->line = ministate.hist_cur->h;
936 }
937 
938 static void
939 global_key_unbound(void)
940 {
941 	message("%s is undefined", keybuf);
942 }
943 
944 static void
945 minibuffer_hist_save_entry(void)
946 {
947 	struct hist	*hist;
948 
949 	if (ministate.history == NULL)
950 		return;
951 
952 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
953 		abort();
954 
955 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
956 
957 	if (TAILQ_EMPTY(&ministate.history->head))
958 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
959 	else
960 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
961 	ministate.history->len++;
962 }
963 
964 /*
965  * taint the minibuffer cache: if we're currently showing a history
966  * element, copy that to the current buf and reset the "history
967  * navigation" thing.
968  */
969 static void
970 minibuffer_taint_hist(void)
971 {
972 	if (ministate.hist_cur == NULL)
973 		return;
974 
975 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
976 	ministate.hist_cur = NULL;
977 }
978 
979 static void
980 minibuffer_self_insert(void)
981 {
982 	char	*c, tmp[5] = {0};
983 	size_t	len;
984 
985 	minibuffer_taint_hist();
986 
987 	if (thiskey.cp == 0)
988 		return;
989 
990 	len = utf8_encode(thiskey.cp, tmp);
991 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
992 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
993 		return;
994 
995 	memmove(c + len, c, strlen(c)+1);
996 	memcpy(c, tmp, len);
997 	ministate.window.cpoff++;
998 }
999 
1000 static void
1001 eecmd_self_insert(void)
1002 {
1003 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1004 	    !unicode_isgraph(thiskey.cp)) {
1005 		global_key_unbound();
1006 		return;
1007 	}
1008 
1009 	minibuffer_self_insert();
1010 }
1011 
1012 static void
1013 eecmd_select(void)
1014 {
1015 	struct cmds *cmd;
1016 
1017 	exit_minibuffer();
1018 	minibuffer_hist_save_entry();
1019 
1020 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1021 		if (!strcmp(cmd->cmd, ministate.buf)) {
1022 			cmd->fn(current_window());
1023 			return;
1024 		}
1025 	}
1026 
1027 	message("Unknown command: %s", ministate.buf);
1028 }
1029 
1030 static void
1031 ir_self_insert(void)
1032 {
1033 	minibuffer_self_insert();
1034 }
1035 
1036 static void
1037 ir_select(void)
1038 {
1039 	char		 buf[1025] = {0};
1040 	struct url	 url;
1041 	struct tab	*tab;
1042 
1043 	tab = current_tab();
1044 
1045 	exit_minibuffer();
1046 	minibuffer_hist_save_entry();
1047 
1048 	/* a bit ugly but... */
1049 	memcpy(&url, &tab->url, sizeof(tab->url));
1050 	url_set_query(&url, ministate.buf);
1051 	url_unparse(&url, buf, sizeof(buf));
1052 	load_url_in_tab(tab, buf);
1053 }
1054 
1055 static void
1056 lu_self_insert(void)
1057 {
1058 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1059 	    !unicode_isgraph(thiskey.key)) {
1060 		global_key_unbound();
1061 		return;
1062 	}
1063 
1064 	minibuffer_self_insert();
1065 }
1066 
1067 static void
1068 lu_select(void)
1069 {
1070 	exit_minibuffer();
1071 	minibuffer_hist_save_entry();
1072 	load_url_in_tab(current_tab(), ministate.buf);
1073 }
1074 
1075 static void
1076 bp_select(void)
1077 {
1078 	exit_minibuffer();
1079 	if (*ministate.buf != '\0')
1080 		add_to_bookmarks(ministate.buf);
1081 	else
1082 		message("Abort.");
1083 }
1084 
1085 static void
1086 yornp_self_insert(void)
1087 {
1088 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1089 		message("Please answer y or n");
1090 		return;
1091 	}
1092 
1093 	yornp_cb(thiskey.key == 'y', current_tab()->id);
1094 	exit_minibuffer();
1095 }
1096 
1097 static void
1098 yornp_abort(void)
1099 {
1100 	yornp_cb(0, current_tab()->id);
1101 	exit_minibuffer();
1102 }
1103 
1104 static struct vline *
1105 nth_line(struct window *window, size_t n)
1106 {
1107 	struct vline	*vl;
1108 	size_t		 i;
1109 
1110 	i = 0;
1111 	TAILQ_FOREACH(vl, &window->head, vlines) {
1112 		if (i == n)
1113 			return vl;
1114 		i++;
1115 	}
1116 
1117 	/* unreachable */
1118 	abort();
1119 }
1120 
1121 static struct tab *
1122 current_tab(void)
1123 {
1124 	struct tab *t;
1125 
1126 	TAILQ_FOREACH(t, &tabshead, tabs) {
1127 		if (t->flags & TAB_CURRENT)
1128 			return t;
1129 	}
1130 
1131 	/* unreachable */
1132 	abort();
1133 }
1134 
1135 static struct window *
1136 current_window(void)
1137 {
1138 	if (in_minibuffer)
1139 		return &ministate.window;
1140 	return &current_tab()->window;
1141 }
1142 
1143 static int
1144 readkey(void)
1145 {
1146 	uint32_t state = 0;
1147 
1148 	if ((thiskey.key = wgetch(body)) == ERR)
1149 		return 0;
1150 
1151 	thiskey.meta = thiskey.key == 27;
1152 	if (thiskey.meta) {
1153 		thiskey.key = wgetch(body);
1154 		if (thiskey.key == ERR || thiskey.key == 27) {
1155 			thiskey.meta = 0;
1156 			thiskey.key = 27;
1157 		}
1158 	}
1159 
1160 	thiskey.cp = 0;
1161 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1162 		while (1) {
1163 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1164 				break;
1165 			if ((thiskey.key = wgetch(body)) == ERR) {
1166 				message("Error decoding user input");
1167 				return 0;
1168 			}
1169 		}
1170 	}
1171 
1172 	return 1;
1173 }
1174 
1175 static void
1176 dispatch_stdio(int fd, short ev, void *d)
1177 {
1178 	struct keymap	*k;
1179 	const char	*keyname;
1180 	char		 tmp[5] = {0};
1181 
1182 	if (!readkey())
1183 		return;
1184 
1185 	if (keybuf[0] != '\0')
1186 		strlcat(keybuf, " ", sizeof(keybuf));
1187 	if (thiskey.meta)
1188 		strlcat(keybuf, "M-", sizeof(keybuf));
1189 	if (thiskey.cp != 0) {
1190 		utf8_encode(thiskey.cp, tmp);
1191 		strlcat(keybuf, tmp, sizeof(keybuf));
1192 	} else {
1193 		if ((keyname = unkbd(thiskey.key)) != NULL)
1194 			strlcat(keybuf, keyname, sizeof(keybuf));
1195 		else {
1196 			tmp[0] = thiskey.key;
1197 			strlcat(keybuf, tmp, sizeof(keybuf));
1198 		}
1199 	}
1200 
1201 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1202 		if (k->meta == thiskey.meta &&
1203 		    k->key == thiskey.key) {
1204 			if (k->fn == NULL)
1205 				current_map = &k->map;
1206 			else {
1207 				current_map = base_map;
1208 				strlcpy(keybuf, "", sizeof(keybuf));
1209 				k->fn(current_window());
1210 			}
1211 			goto done;
1212 		}
1213 	}
1214 
1215 	if (current_map->unhandled_input != NULL)
1216 		current_map->unhandled_input();
1217 	else {
1218 		global_key_unbound();
1219 	}
1220 
1221 	strlcpy(keybuf, "", sizeof(keybuf));
1222 	current_map = base_map;
1223 
1224 done:
1225 	redraw_tab(current_tab());
1226 }
1227 
1228 static void
1229 handle_clear_minibuf(int fd, short ev, void *d)
1230 {
1231 	free(ministate.curmesg);
1232 	ministate.curmesg = NULL;
1233 
1234 	redraw_minibuffer();
1235 	if (in_minibuffer) {
1236 		wrefresh(body);
1237 		wrefresh(minibuf);
1238 	} else {
1239 		wrefresh(minibuf);
1240 		wrefresh(body);
1241 	}
1242 }
1243 
1244 static void
1245 handle_resize(int sig, short ev, void *d)
1246 {
1247 	struct tab	*tab;
1248 
1249 	endwin();
1250 	refresh();
1251 	clear();
1252 
1253 	/* move and resize the windows, in reverse order! */
1254 
1255 	mvwin(minibuf, LINES-1, 0);
1256 	wresize(minibuf, 1, COLS);
1257 
1258 	mvwin(modeline, LINES-2, 0);
1259 	wresize(modeline, 1, COLS);
1260 
1261 	wresize(body, LINES-3, COLS);
1262 	body_lines = LINES-3;
1263 	body_cols = COLS;
1264 
1265 	wresize(tabline, 1, COLS);
1266 
1267 	tab = current_tab();
1268 
1269 	wrap_page(&tab->window);
1270 	redraw_tab(tab);
1271 }
1272 
1273 static int
1274 wrap_page(struct window *window)
1275 {
1276 	struct line		*l;
1277 	const struct line	*orig;
1278 	struct vline		*vl;
1279 	const char		*prfx;
1280 
1281 	orig = window->current_line == NULL
1282 		? NULL
1283 		: window->current_line->parent;
1284 	window->current_line = NULL;
1285 
1286 	window->curs_y = 0;
1287 	window->line_off = 0;
1288 
1289 	empty_vlist(window);
1290 
1291 	TAILQ_FOREACH(l, &window->page.head, lines) {
1292 		prfx = line_prefixes[l->type].prfx1;
1293 		switch (l->type) {
1294 		case LINE_TEXT:
1295 		case LINE_LINK:
1296 		case LINE_TITLE_1:
1297 		case LINE_TITLE_2:
1298 		case LINE_TITLE_3:
1299 		case LINE_ITEM:
1300 		case LINE_QUOTE:
1301 		case LINE_PRE_START:
1302 		case LINE_PRE_END:
1303 			wrap_text(window, prfx, l, body_cols);
1304 			break;
1305 		case LINE_PRE_CONTENT:
1306                         hardwrap_text(window, l, body_cols);
1307 			break;
1308 		}
1309 
1310 		if (orig == l && window->current_line == NULL) {
1311 			window->line_off = window->line_max-1;
1312 			window->current_line = TAILQ_LAST(&window->head, vhead);
1313 
1314 			while (1) {
1315 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1316 				if (vl == NULL || vl->parent != orig)
1317 					break;
1318 				window->current_line = vl;
1319 				window->line_off--;
1320 			}
1321 		}
1322 	}
1323 
1324         if (window->current_line == NULL)
1325 		window->current_line = TAILQ_FIRST(&window->head);
1326 
1327 	return 1;
1328 }
1329 
1330 static void
1331 print_vline(struct vline *vl)
1332 {
1333 	const char *text = vl->line;
1334 	const char *prfx;
1335 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1336 	int text_face = line_faces[vl->parent->type].text_prop;
1337 
1338 	if (!vl->flags)
1339 		prfx = line_prefixes[vl->parent->type].prfx1;
1340 	else
1341 		prfx = line_prefixes[vl->parent->type].prfx2;
1342 
1343 	if (text == NULL)
1344 		text = "";
1345 
1346 	wattron(body, prefix_face);
1347 	wprintw(body, "%s", prfx);
1348 	wattroff(body, prefix_face);
1349 
1350 	wattron(body, text_face);
1351 	wprintw(body, "%s", text);
1352 	wattroff(body, text_face);
1353 }
1354 
1355 static void
1356 redraw_tabline(void)
1357 {
1358 	struct tab	*tab;
1359 	size_t		 toskip;
1360 	int		 current, x, y, truncated;
1361 	const char	*title;
1362 	char		 buf[25];
1363 
1364 	toskip = 0;
1365 	x = 1;
1366 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1367 		x += sizeof(buf) + 1;
1368 		toskip++;
1369 		if (tab->flags & TAB_CURRENT)
1370 			break;
1371 	}
1372 	if (x < COLS-2)
1373 		toskip = 0;
1374 	else
1375 		toskip--;
1376 
1377 	werase(tabline);
1378 	wattron(tabline, tab_face.background);
1379 	wprintw(tabline, toskip == 0 ? " " : "<");
1380 	wattroff(tabline, tab_face.background);
1381 
1382 	truncated = 0;
1383 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1384 		if (truncated)
1385 			break;
1386 		if (toskip != 0) {
1387 			toskip--;
1388 			continue;
1389 		}
1390 
1391 		getyx(tabline, y, x);
1392 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1393 			truncated = 1;
1394 
1395 		current = tab->flags & TAB_CURRENT;
1396 
1397 		if (*(title = tab->window.page.title) == '\0')
1398 			title = tab->hist_cur->h;
1399 
1400 		strlcpy(buf, " ", sizeof(buf));
1401                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1402 			/* truncation happens */
1403 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1404 		} else {
1405 			/* pad with spaces */
1406 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1407 				/* nop */ ;
1408 		}
1409 
1410 		if (current)
1411 			wattron(tabline, tab_face.current_tab);
1412 		else
1413 			wattron(tabline, tab_face.tab);
1414 
1415 		wprintw(tabline, "%s", buf);
1416 		if (TAILQ_NEXT(tab, tabs) != NULL)
1417 			wprintw(tabline, " ");
1418 
1419 		if (current)
1420 			wattroff(tabline, tab_face.current_tab);
1421 		else
1422 			wattroff(tabline, tab_face.tab);
1423 	}
1424 
1425 	wattron(tabline, tab_face.background);
1426 	for (; x < COLS; ++x)
1427 		waddch(tabline, ' ');
1428 	if (truncated)
1429 		mvwprintw(tabline, 0, COLS-1, ">");
1430 }
1431 
1432 static inline char
1433 trust_status_char(enum trust_state ts)
1434 {
1435 	switch (ts) {
1436 	case TS_UNKNOWN:	return 'u';
1437 	case TS_UNTRUSTED:	return '!';
1438 	case TS_TRUSTED:	return 'v';
1439 	case TS_VERIFIED:	return 'V';
1440 	}
1441 }
1442 
1443 static void
1444 redraw_modeline(struct tab *tab)
1445 {
1446 	double		 pct;
1447 	int		 x, y, max_x, max_y;
1448 	const char	*mode = tab->window.page.name;
1449 	const char	*spin = "-\\|/";
1450 
1451 	werase(modeline);
1452 	wattron(modeline, A_REVERSE);
1453 	wmove(modeline, 0, 0);
1454 
1455 	wprintw(modeline, "-%c%c %s ",
1456 	    spin[tab->loading_anim_step],
1457 	    trust_status_char(tab->trust),
1458 	    mode == NULL ? "(none)" : mode);
1459 
1460 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1461 
1462 	if (tab->window.line_max <= (size_t)body_lines)
1463                 wprintw(modeline, "All ");
1464 	else if (tab->window.line_off == 0)
1465                 wprintw(modeline, "Top ");
1466 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1467 		wprintw(modeline, "Bottom ");
1468 	else
1469 		wprintw(modeline, "%.0f%% ", pct);
1470 
1471 	wprintw(modeline, "%d/%d %s ",
1472 	    tab->window.line_off + tab->window.curs_y,
1473 	    tab->window.line_max,
1474 	    tab->hist_cur->h);
1475 
1476 	getyx(modeline, y, x);
1477 	getmaxyx(modeline, max_y, max_x);
1478 
1479 	(void)y;
1480 	(void)max_y;
1481 
1482 	for (; x < max_x; ++x)
1483 		waddstr(modeline, "-");
1484 }
1485 
1486 static void
1487 redraw_minibuffer(void)
1488 {
1489 	struct tab *tab;
1490 	size_t off_y, off_x = 0;
1491 	char *start, *c;
1492 
1493 	werase(minibuf);
1494 
1495 	if (in_minibuffer) {
1496 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1497 		if (ministate.hist_cur != NULL)
1498 			wprintw(minibuf, "(%zu/%zu) ",
1499 			    ministate.hist_off + 1,
1500 			    ministate.history->len);
1501 
1502 		getyx(minibuf, off_y, off_x);
1503 
1504 		start = ministate.hist_cur != NULL
1505 			? ministate.hist_cur->h
1506 			: ministate.buf;
1507 		c = utf8_nth(ministate.window.current_line->line,
1508 		    ministate.window.cpoff);
1509 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1510 			start = utf8_next_cp(start);
1511 		}
1512 
1513 		waddstr(minibuf, start);
1514 	}
1515 
1516 	if (ministate.curmesg != NULL)
1517                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1518 		    ministate.curmesg);
1519 
1520 	if (!in_minibuffer && ministate.curmesg == NULL)
1521 		waddstr(minibuf, keybuf);
1522 
1523 	/* If nothing else, show the URL at point */
1524 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1525 		tab = current_tab();
1526 		if (tab->window.current_line != NULL &&
1527 		    tab->window.current_line->parent->type == LINE_LINK)
1528 			waddstr(minibuf, tab->window.current_line->parent->alt);
1529 	}
1530 
1531 	if (in_minibuffer)
1532 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1533 }
1534 
1535 static void
1536 redraw_tab(struct tab *tab)
1537 {
1538 	redraw_tabline();
1539 	redraw_body(tab);
1540 	redraw_modeline(tab);
1541 	redraw_minibuffer();
1542 
1543 	wrefresh(tabline);
1544 	wrefresh(modeline);
1545 
1546 	if (in_minibuffer) {
1547 		wrefresh(body);
1548 		wrefresh(minibuf);
1549 	} else {
1550 		wrefresh(minibuf);
1551 		wrefresh(body);
1552 	}
1553 }
1554 
1555 static void
1556 redraw_body(struct tab *tab)
1557 {
1558 	struct vline	*vl;
1559 	int		 line;
1560 
1561 	werase(body);
1562 
1563 	tab->window.line_off = MIN(tab->window.line_max-1, tab->window.line_off);
1564 	if (TAILQ_EMPTY(&tab->window.head))
1565 		return;
1566 
1567 	line = 0;
1568 	vl = nth_line(&tab->window, tab->window.line_off);
1569 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1570 		wmove(body, line, 0);
1571 		print_vline(vl);
1572 		line++;
1573 		if (line == body_lines)
1574 			break;
1575 	}
1576 
1577 	wmove(body, tab->window.curs_y, tab->window.curs_x);
1578 }
1579 
1580 static void
1581 vmessage(const char *fmt, va_list ap)
1582 {
1583 	if (evtimer_pending(&clminibufev, NULL))
1584 		evtimer_del(&clminibufev);
1585 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1586 	evtimer_add(&clminibufev, &clminibufev_timer);
1587 
1588 	free(ministate.curmesg);
1589 
1590 	/* TODO: what to do if the allocation fails here? */
1591 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1592 		ministate.curmesg = NULL;
1593 
1594 	redraw_minibuffer();
1595 	if (in_minibuffer) {
1596 		wrefresh(body);
1597 		wrefresh(minibuf);
1598 	} else {
1599 		wrefresh(minibuf);
1600 		wrefresh(body);
1601 	}
1602 }
1603 
1604 static void
1605 message(const char *fmt, ...)
1606 {
1607 	va_list ap;
1608 
1609 	va_start(ap, fmt);
1610 	vmessage(fmt, ap);
1611 	va_end(ap);
1612 }
1613 
1614 static void
1615 start_loading_anim(struct tab *tab)
1616 {
1617 	if (tab->loading_anim)
1618 		return;
1619 	tab->loading_anim = 1;
1620 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1621 	evtimer_add(&tab->loadingev, &loadingev_timer);
1622 }
1623 
1624 static void
1625 update_loading_anim(int fd, short ev, void *d)
1626 {
1627 	struct tab	*tab = d;
1628 
1629 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1630 
1631 	if (tab->flags & TAB_CURRENT) {
1632 		redraw_modeline(tab);
1633 		wrefresh(modeline);
1634 		wrefresh(body);
1635 		if (in_minibuffer)
1636 			wrefresh(minibuf);
1637 	}
1638 
1639 	evtimer_add(&tab->loadingev, &loadingev_timer);
1640 }
1641 
1642 static void
1643 stop_loading_anim(struct tab *tab)
1644 {
1645 	if (!tab->loading_anim)
1646 		return;
1647 	evtimer_del(&tab->loadingev);
1648 	tab->loading_anim = 0;
1649 	tab->loading_anim_step = 0;
1650 
1651 	if (!(tab->flags & TAB_CURRENT))
1652 		return;
1653 
1654 	redraw_modeline(tab);
1655 
1656 	wrefresh(modeline);
1657 	wrefresh(body);
1658 	if (in_minibuffer)
1659 		wrefresh(minibuf);
1660 }
1661 
1662 static void
1663 load_url_in_tab(struct tab *tab, const char *url)
1664 {
1665 	empty_vlist(&tab->window);
1666 	message("Loading %s...", url);
1667 	start_loading_anim(tab);
1668 	load_url(tab, url);
1669 
1670 	tab->window.curs_x = 0;
1671 	tab->window.curs_y = 0;
1672 	redraw_tab(tab);
1673 }
1674 
1675 static void
1676 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1677     void (*abortfn)(void), struct histhead *hist)
1678 {
1679 	in_minibuffer = 1;
1680 	base_map = &minibuffer_map;
1681 	current_map = &minibuffer_map;
1682 
1683 	base_map->unhandled_input = self_insert_fn;
1684 
1685 	ministate.donefn = donefn;
1686 	ministate.abortfn = abortfn;
1687 	memset(ministate.buf, 0, sizeof(ministate.buf));
1688 	ministate.window.current_line = &ministate.vline;
1689 	ministate.window.current_line->line = ministate.buf;
1690 	ministate.window.cpoff = 0;
1691 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1692 
1693 	ministate.history = hist;
1694 	ministate.hist_cur = NULL;
1695 	ministate.hist_off = 0;
1696 }
1697 
1698 static void
1699 exit_minibuffer(void)
1700 {
1701 	werase(minibuf);
1702 
1703 	in_minibuffer = 0;
1704 	base_map = &global_map;
1705 	current_map = &global_map;
1706 }
1707 
1708 static void
1709 switch_to_tab(struct tab *tab)
1710 {
1711 	struct tab	*t;
1712 
1713 	TAILQ_FOREACH(t, &tabshead, tabs) {
1714 		t->flags &= ~TAB_CURRENT;
1715 	}
1716 
1717 	tab->flags |= TAB_CURRENT;
1718 }
1719 
1720 static struct tab *
1721 new_tab(const char *url)
1722 {
1723 	struct tab	*tab;
1724 
1725 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1726 		event_loopbreak();
1727 		return NULL;
1728 	}
1729 
1730 	TAILQ_INIT(&tab->hist.head);
1731 
1732 	TAILQ_INIT(&tab->window.head);
1733 
1734 	tab->id = tab_counter++;
1735 	switch_to_tab(tab);
1736 
1737 	if (TAILQ_EMPTY(&tabshead))
1738 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1739 	else
1740 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1741 
1742 	load_url_in_tab(tab, url);
1743 	return tab;
1744 }
1745 
1746 static void
1747 usage(void)
1748 {
1749 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1750 }
1751 
1752 int
1753 ui_init(int argc, char * const *argv)
1754 {
1755 	const char *url = NEW_TAB_URL;
1756 	int ch;
1757 
1758 	while ((ch = getopt(argc, argv, "")) != -1) {
1759 		switch (ch) {
1760 		default:
1761 			usage();
1762 			return 0;
1763 		}
1764 	}
1765 	argc -= optind;
1766 	argv += optind;
1767 
1768 	if (argc != 0)
1769 		url = argv[0];
1770 
1771 	setlocale(LC_ALL, "");
1772 
1773 	TAILQ_INIT(&global_map.m);
1774 	global_map.unhandled_input = global_key_unbound;
1775 
1776 	TAILQ_INIT(&minibuffer_map.m);
1777 
1778 	TAILQ_INIT(&eecmd_history.head);
1779 	TAILQ_INIT(&ir_history.head);
1780 	TAILQ_INIT(&lu_history.head);
1781 
1782 	ministate.line.type = LINE_TEXT;
1783 	ministate.vline.parent = &ministate.line;
1784 	ministate.window.current_line = &ministate.vline;
1785 
1786 	base_map = &global_map;
1787 	current_map = &global_map;
1788 	load_default_keys();
1789 
1790 	initscr();
1791 	raw();
1792 	noecho();
1793 
1794 	nonl();
1795 	intrflush(stdscr, FALSE);
1796 
1797 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1798 		return 0;
1799 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1800 		return 0;
1801 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1802 		return 0;
1803 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1804 		return 0;
1805 
1806 	body_lines = LINES-3;
1807 	body_cols = COLS;
1808 
1809 	keypad(body, TRUE);
1810 	scrollok(body, TRUE);
1811 
1812 	/* non-blocking input */
1813 	wtimeout(body, 0);
1814 
1815 	mvwprintw(body, 0, 0, "");
1816 
1817 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1818 	event_add(&stdioev, NULL);
1819 
1820 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1821 	signal_add(&winchev, NULL);
1822 
1823 	new_tab(url);
1824 
1825 	return 1;
1826 }
1827 
1828 void
1829 ui_on_tab_loaded(struct tab *tab)
1830 {
1831 	stop_loading_anim(tab);
1832 	message("Loaded %s", tab->hist_cur->h);
1833 
1834 	redraw_tabline();
1835 	wrefresh(tabline);
1836 	if (in_minibuffer)
1837 		wrefresh(minibuf);
1838 	else
1839 		wrefresh(body);
1840 }
1841 
1842 void
1843 ui_on_tab_refresh(struct tab *tab)
1844 {
1845 	wrap_page(&tab->window);
1846 	if (tab->flags & TAB_CURRENT) {
1847 		restore_cursor(&tab->window);
1848 		redraw_tab(tab);
1849 	}
1850 }
1851 
1852 void
1853 ui_require_input(struct tab *tab, int hide)
1854 {
1855 	/* TODO: hard-switching to another tab is ugly */
1856 	switch_to_tab(tab);
1857 
1858 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1859 	    &ir_history);
1860 	strlcpy(ministate.prompt, "Input required: ",
1861 	    sizeof(ministate.prompt));
1862 	redraw_tab(tab);
1863 }
1864 
1865 void
1866 ui_yornp(const char *prompt, void (*fn)(int, unsigned int))
1867 {
1868 	size_t len;
1869 
1870 	yornp_cb = fn;
1871 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
1872 	    yornp_abort, NULL);
1873 
1874 	len = sizeof(ministate.prompt);
1875 	strlcpy(ministate.prompt, prompt, len);
1876 	strlcat(ministate.prompt, " (y or n) ", len);
1877 	redraw_tab(current_tab());
1878 }
1879 
1880 void
1881 ui_notify(const char *fmt, ...)
1882 {
1883 	va_list ap;
1884 
1885 	va_start(ap, fmt);
1886 	vmessage(fmt, ap);
1887 	va_end(ap);
1888 }
1889 
1890 void
1891 ui_end(void)
1892 {
1893 	endwin();
1894 }