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Date:: Sun Mar 28 15:43:10 2021 UTC
Message:: reorder cmd bindings, no functional changes
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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_tab_move);
90 CMD(cmd_tab_move_to);
91 CMD(cmd_load_url);
92 CMD(cmd_load_current_url);
93 CMD(cmd_bookmark_page);
94 CMD(cmd_goto_bookmarks);
95 
96 CMD(cmd_mini_delete_char);
97 CMD(cmd_mini_delete_backward_char);
98 CMD(cmd_mini_kill_line);
99 CMD(cmd_mini_abort);
100 CMD(cmd_mini_complete_and_exit);
101 CMD(cmd_mini_previous_history_element);
102 CMD(cmd_mini_next_history_element);
103 
104 #include "cmd.gen.h"
105 
106 static void		 global_key_unbound(void);
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 static void		 yornp_self_insert(void);
118 static void		 yornp_abort(void);
119 
120 static struct vline	*nth_line(struct window*, size_t);
121 static struct tab	*current_tab(void);
122 static struct window	*current_window(void);
123 static int		 readkey(void);
124 static void		 dispatch_stdio(int, short, void*);
125 static void		 handle_clear_minibuf(int, short, void*);
126 static void		 handle_resize(int, short, void*);
127 static int		 wrap_page(struct window*);
128 static void		 print_vline(struct vline*);
129 static void		 redraw_tabline(void);
130 static void		 redraw_body(struct tab*);
131 static void		 redraw_modeline(struct tab*);
132 static void		 redraw_minibuffer(void);
133 static void		 redraw_tab(struct tab*);
134 static void		 vmessage(const char*, va_list);
135 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
136 static void		 start_loading_anim(struct tab*);
137 static void		 update_loading_anim(int, short, void*);
138 static void		 stop_loading_anim(struct tab*);
139 static void		 load_url_in_tab(struct tab*, const char*);
140 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
141 static void		 exit_minibuffer(void);
142 static void		 switch_to_tab(struct tab*);
143 static struct tab	*new_tab(const char*);
144 static void		 usage(void);
145 
146 static struct { short meta; int key; uint32_t cp; } thiskey;
147 
148 static WINDOW	*tabline, *body, *modeline, *minibuf;
149 static int	 body_lines, body_cols;
150 
151 static struct event	clminibufev;
152 static struct timeval	clminibufev_timer = { 5, 0 };
153 static struct timeval	loadingev_timer = { 0, 250000 };
154 
155 static uint32_t		 tab_counter;
156 
157 static char	keybuf[64];
158 
159 static void (*yornp_cb)(int, unsigned int);
160 
161 struct kmap global_map,
162 	minibuffer_map,
163 	*current_map,
164 	*base_map;
165 
166 static struct histhead eecmd_history,
167 	ir_history,
168 	lu_history;
169 
170 static int	in_minibuffer;
171 
172 static struct {
173 	char		*curmesg;
174 
175 	char		 prompt[64];
176 	void		 (*donefn)(void);
177 	void		 (*abortfn)(void);
178 
179 	char		 buf[1025];
180 	struct line	 line;
181 	struct vline	 vline;
182 	struct window	 window;
183 
184 	struct histhead	*history;
185 	struct hist	*hist_cur;
186 	size_t		 hist_off;
187 } ministate;
188 
189 struct lineprefix {
190 	const char	*prfx1;
191 	const char	*prfx2;
192 } line_prefixes[] = {
193 	[LINE_TEXT] =		{ "",		"" },
194 	[LINE_LINK] =		{ "=> ",	"   " },
195 	[LINE_TITLE_1] =	{ "# ",		"  " },
196 	[LINE_TITLE_2] =	{ "## ",	"   " },
197 	[LINE_TITLE_3] =	{ "### ",	"    " },
198 	[LINE_ITEM] =		{ "* ",		"  " },
199 	[LINE_QUOTE] =		{ "> ",		"  " },
200 	[LINE_PRE_START] =	{ "```",	"   " },
201 	[LINE_PRE_CONTENT] =	{ "",		"" },
202 	[LINE_PRE_END] =	{ "```",	"```" },
203 };
204 
205 static struct line_face {
206 	int prefix_prop;
207 	int text_prop;
208 } line_faces[] = {
209 	[LINE_TEXT] =		{ 0,		0 },
210 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
211 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
212 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
213 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
214 	[LINE_ITEM] =		{ 0,		0 },
215 	[LINE_QUOTE] =		{ 0,		A_DIM },
216 	[LINE_PRE_START] =	{ 0,		0 },
217 	[LINE_PRE_CONTENT] =	{ 0,		0 },
218 	[LINE_PRE_END] =	{ 0,		0 },
219 };
220 
221 static struct tab_face {
222 	int background, tab, current_tab;
223 } tab_face = {
224 	A_REVERSE, A_REVERSE, A_NORMAL
225 };
226 
227 static void
228 empty_vlist(struct window *window)
229 {
230 	struct vline *vl, *t;
231 
232 	window->current_line = NULL;
233 	window->line_max = 0;
234 
235 	TAILQ_FOREACH_SAFE(vl, &window->head, vlines, t) {
236 		TAILQ_REMOVE(&window->head, vl, vlines);
237 		free(vl->line);
238 		free(vl);
239 	}
240 }
241 
242 static inline void
243 global_set_key(const char *key, void (*fn)(struct window*))
244 {
245 	if (!kmap_define_key(&global_map, key, fn))
246 		_exit(1);
247 }
248 
249 static inline void
250 minibuffer_set_key(const char *key, void (*fn)(struct window*))
251 {
252 	if (!kmap_define_key(&minibuffer_map, key, fn))
253 		_exit(1);
254 }
255 
256 static void
257 load_default_keys(void)
258 {
259 	/* === global map === */
260 
261 	/* emacs */
262 	global_set_key("C-p",		cmd_previous_line);
263 	global_set_key("C-n",		cmd_next_line);
264 	global_set_key("C-f",		cmd_forward_char);
265 	global_set_key("C-b",		cmd_backward_char);
266 	global_set_key("M-{",		cmd_backward_paragraph);
267 	global_set_key("M-}",		cmd_forward_paragraph);
268 	global_set_key("C-a",		cmd_move_beginning_of_line);
269 	global_set_key("C-e",		cmd_move_end_of_line);
270 
271 	global_set_key("M-v",		cmd_scroll_up);
272 	global_set_key("C-v",		cmd_scroll_down);
273 	global_set_key("M-space",	cmd_scroll_up);
274 	global_set_key("space",		cmd_scroll_down);
275 
276 	global_set_key("M-<",		cmd_beginning_of_buffer);
277 	global_set_key("M->",		cmd_end_of_buffer);
278 
279 	global_set_key("C-x C-c",	cmd_kill_telescope);
280 
281 	global_set_key("C-g",		cmd_clear_minibuf);
282 
283 	global_set_key("M-x",		cmd_execute_extended_command);
284 	global_set_key("C-x C-f",	cmd_load_url);
285 	global_set_key("C-x M-f",	cmd_load_current_url);
286 
287 	global_set_key("C-x t 0",	cmd_tab_close);
288 	global_set_key("C-x t 1",	cmd_tab_close_other);
289 	global_set_key("C-x t 2",	cmd_tab_new);
290 	global_set_key("C-x t o",	cmd_tab_next);
291 	global_set_key("C-x t O",	cmd_tab_previous);
292 	global_set_key("C-x t m",	cmd_tab_move);
293 	global_set_key("C-x t M",	cmd_tab_move_to);
294 
295 	global_set_key("C-M-b",		cmd_previous_page);
296 	global_set_key("C-M-f",		cmd_next_page);
297 
298 	global_set_key("<f7> a",	cmd_bookmark_page);
299 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
300 
301 	/* vi/vi-like */
302 	global_set_key("k",		cmd_previous_line);
303 	global_set_key("j",		cmd_next_line);
304 	global_set_key("l",		cmd_forward_char);
305 	global_set_key("h",		cmd_backward_char);
306 	global_set_key("{",		cmd_backward_paragraph);
307 	global_set_key("}",		cmd_forward_paragraph);
308 	global_set_key("^",		cmd_move_beginning_of_line);
309 	global_set_key("$",		cmd_move_end_of_line);
310 
311 	global_set_key("K",		cmd_scroll_line_up);
312 	global_set_key("J",		cmd_scroll_line_down);
313 
314 	global_set_key("g g",		cmd_beginning_of_buffer);
315 	global_set_key("G",		cmd_end_of_buffer);
316 
317 	global_set_key("g D",		cmd_tab_close);
318 	global_set_key("g N",		cmd_tab_new);
319 	global_set_key("g t",		cmd_tab_next);
320 	global_set_key("g T",		cmd_tab_previous);
321 	global_set_key("g M-t",		cmd_tab_move);
322 	global_set_key("g M-T",		cmd_tab_move_to);
323 
324 	global_set_key("H",		cmd_previous_page);
325 	global_set_key("L",		cmd_next_page);
326 
327 	/* tmp */
328 	global_set_key("q",		cmd_kill_telescope);
329 
330 	global_set_key("esc",		cmd_clear_minibuf);
331 
332 	global_set_key(":",		cmd_execute_extended_command);
333 
334 	/* cua */
335 	global_set_key("<up>",		cmd_previous_line);
336 	global_set_key("<down>",	cmd_next_line);
337 	global_set_key("<right>",	cmd_forward_char);
338 	global_set_key("<left>",	cmd_backward_char);
339 	global_set_key("<prior>",	cmd_scroll_up);
340 	global_set_key("<next>",	cmd_scroll_down);
341 
342 	global_set_key("M-<left>",	cmd_previous_page);
343 	global_set_key("M-<right>",	cmd_next_page);
344 
345 	/* "ncurses standard" */
346 	global_set_key("C-l",		cmd_redraw);
347 
348 	/* global */
349 	global_set_key("C-m",		cmd_push_button);
350 	global_set_key("M-enter",	cmd_push_button_new_tab);
351 	global_set_key("M-tab",		cmd_previous_button);
352 	global_set_key("tab",		cmd_next_button);
353 
354 	/* === minibuffer map === */
355 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
356 	minibuffer_set_key("C-g",		cmd_mini_abort);
357 	minibuffer_set_key("esc",		cmd_mini_abort);
358 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
359 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
360 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
361 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
362 
363 	minibuffer_set_key("C-b",		cmd_backward_char);
364 	minibuffer_set_key("C-f",		cmd_forward_char);
365 	minibuffer_set_key("<left>",		cmd_backward_char);
366 	minibuffer_set_key("<right>",		cmd_forward_char);
367 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
368 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
369 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
370 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
371 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
372 
373 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
374 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
375 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
376 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
377 }
378 
379 static void
380 restore_cursor(struct window *window)
381 {
382 	struct vline	*vl;
383 	const char	*prfx;
384 
385 	vl = window->current_line;
386 	if (vl == NULL || vl->line == NULL)
387 		window->curs_x = window->cpoff = 0;
388 	else
389 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
390 
391 	if (vl != NULL) {
392 		prfx = line_prefixes[vl->parent->type].prfx1;
393 		window->curs_x += utf8_swidth(prfx);
394 	}
395 }
396 
397 static void
398 cmd_previous_line(struct window *window)
399 {
400 	struct vline	*vl;
401 
402 	if (window->current_line == NULL
403 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
404 		return;
405 
406 	if (--window->curs_y < 0) {
407 		window->curs_y = 0;
408 		cmd_scroll_line_up(window);
409 		return;
410 	}
411 
412 	window->current_line = vl;
413 	restore_cursor(window);
414 }
415 
416 static void
417 cmd_next_line(struct window *window)
418 {
419 	struct vline	*vl;
420 
421 	if (window->current_line == NULL
422 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
423 		return;
424 
425 	if (++window->curs_y > body_lines-1) {
426 		window->curs_y = body_lines-1;
427 		cmd_scroll_line_down(window);
428 		return;
429 	}
430 
431 	window->current_line = vl;
432 	restore_cursor(window);
433 }
434 
435 static void
436 cmd_backward_char(struct window *window)
437 {
438 	if (window->cpoff != 0)
439 		window->cpoff--;
440 	restore_cursor(window);
441 }
442 
443 static void
444 cmd_forward_char(struct window *window)
445 {
446 	window->cpoff++;
447 	restore_cursor(window);
448 }
449 
450 static void
451 cmd_backward_paragraph(struct window *window)
452 {
453 	do {
454 		if (window->current_line == NULL ||
455 		    window->current_line == TAILQ_FIRST(&window->head)) {
456 			message("No previous paragraph");
457 			return;
458 		}
459 		cmd_previous_line(window);
460 	} while (window->current_line->line != NULL ||
461 	    window->current_line->parent->type != LINE_TEXT);
462 }
463 
464 static void
465 cmd_forward_paragraph(struct window *window)
466 {
467 	do {
468 		if (window->current_line == NULL ||
469 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
470 			message("No next paragraph");
471 			return;
472 		}
473 		cmd_next_line(window);
474 	} while (window->current_line->line != NULL ||
475 	    window->current_line->parent->type != LINE_TEXT);
476 }
477 
478 static void
479 cmd_move_beginning_of_line(struct window *window)
480 {
481 	window->cpoff = 0;
482 	restore_cursor(window);
483 }
484 
485 static void
486 cmd_move_end_of_line(struct window *window)
487 {
488 	struct vline	*vl;
489 
490 	vl = window->current_line;
491 	if (vl->line == NULL)
492 		return;
493 	window->cpoff = utf8_cplen(vl->line);
494 	restore_cursor(window);
495 }
496 
497 static void
498 cmd_redraw(struct window *window)
499 {
500 	handle_resize(0, 0, NULL);
501 }
502 
503 static void
504 cmd_scroll_line_up(struct window *window)
505 {
506 	struct vline	*vl;
507 
508 	if (window->line_off == 0)
509 		return;
510 
511 	vl = nth_line(window, --window->line_off);
512 	wscrl(body, -1);
513 	wmove(body, 0, 0);
514 	print_vline(vl);
515 
516 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
517 	restore_cursor(window);
518 }
519 
520 static void
521 cmd_scroll_line_down(struct window *window)
522 {
523 	struct vline	*vl;
524 
525 	vl = window->current_line;
526 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
527 		return;
528 	window->current_line = vl;
529 
530 	window->line_off++;
531 	wscrl(body, 1);
532 
533 	if (window->line_max - window->line_off < (size_t)body_lines)
534 		return;
535 
536 	vl = nth_line(window, window->line_off + body_lines-1);
537 	wmove(body, body_lines-1, 0);
538 	print_vline(vl);
539 
540 	restore_cursor(window);
541 }
542 
543 static void
544 cmd_scroll_up(struct window *window)
545 {
546 	size_t off;
547 
548 	off = body_lines+1;
549 
550 	for (; off > 0; --off)
551 		cmd_scroll_line_up(window);
552 }
553 
554 static void
555 cmd_scroll_down(struct window *window)
556 {
557 	size_t off;
558 
559 	off = body_lines+1;
560 
561 	for (; off > 0; --off)
562 		cmd_scroll_line_down(window);
563 }
564 
565 static void
566 cmd_beginning_of_buffer(struct window *window)
567 {
568 	window->current_line = TAILQ_FIRST(&window->head);
569 	window->line_off = 0;
570 	window->curs_y = 0;
571 	window->cpoff = 0;
572 	restore_cursor(window);
573 }
574 
575 static void
576 cmd_end_of_buffer(struct window *window)
577 {
578 	ssize_t off;
579 
580 	off = window->line_max - body_lines;
581 	off = MAX(0, off);
582 
583 	window->line_off = off;
584 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
585 
586 	window->current_line = TAILQ_LAST(&window->head, vhead);
587 	window->cpoff = body_cols;
588 	restore_cursor(window);
589 }
590 
591 static void
592 cmd_kill_telescope(struct window *window)
593 {
594 	event_loopbreak();
595 }
596 
597 static void
598 cmd_push_button(struct window *window)
599 {
600 	struct vline	*vl;
601 	size_t		 nth;
602 
603 	nth = window->line_off + window->curs_y;
604 	if (nth >= window->line_max)
605 		return;
606 	vl = nth_line(window, nth);
607 	if (vl->parent->type != LINE_LINK)
608 		return;
609 
610 	load_url_in_tab(current_tab(), vl->parent->alt);
611 }
612 
613 static void
614 cmd_push_button_new_tab(struct window *window)
615 {
616 	struct vline	*vl;
617 	size_t		 nth;
618 
619 	nth = window->line_off + window->curs_y;
620 	if (nth > window->line_max)
621 		return;
622 	vl = nth_line(window, nth);
623 	if (vl->parent->type != LINE_LINK)
624 		return;
625 
626 	new_tab(vl->parent->alt);
627 }
628 
629 static void
630 cmd_previous_button(struct window *window)
631 {
632 	do {
633 		if (window->current_line == NULL ||
634 		    window->current_line == TAILQ_FIRST(&window->head)) {
635 			message("No previous link");
636 			return;
637 		}
638 		cmd_previous_line(window);
639 	} while (window->current_line->parent->type != LINE_LINK);
640 }
641 
642 static void
643 cmd_next_button(struct window *window)
644 {
645 	do {
646 		if (window->current_line == NULL ||
647 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
648 			message("No next link");
649 			return;
650 		}
651 		cmd_next_line(window);
652 	} while (window->current_line->parent->type != LINE_LINK);
653 }
654 
655 static void
656 cmd_previous_page(struct window *window)
657 {
658 	struct tab *tab = current_tab();
659 
660 	if (!load_previous_page(tab))
661 		message("No previous page");
662 	else
663 		start_loading_anim(tab);
664 }
665 
666 static void
667 cmd_next_page(struct window *window)
668 {
669 	struct tab *tab = current_tab();
670 
671 	if (!load_next_page(tab))
672 		message("No next page");
673 	else
674 		start_loading_anim(tab);
675 }
676 
677 static void
678 cmd_clear_minibuf(struct window *window)
679 {
680 	handle_clear_minibuf(0, 0, NULL);
681 }
682 
683 static void
684 cmd_execute_extended_command(struct window *window)
685 {
686 	size_t	 len;
687 
688 	if (in_minibuffer) {
689 		message("We don't have enable-recursive-minibuffers");
690 		return;
691 	}
692 
693 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
694 	    &eecmd_history);
695 
696 	len = sizeof(ministate.prompt);
697 	strlcpy(ministate.prompt, "", len);
698 
699 	if (thiskey.meta)
700 		strlcat(ministate.prompt, "M-", len);
701 
702 	strlcat(ministate.prompt, keyname(thiskey.key), len);
703 	strlcat(ministate.prompt, " ", len);
704 }
705 
706 static void
707 cmd_tab_close(struct window *window)
708 {
709 	struct tab *tab, *t;
710 
711 	tab = current_tab();
712 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
713 	    TAILQ_NEXT(tab, tabs) == NULL) {
714 		message("Can't close the only tab.");
715 		return;
716 	}
717 
718 	if (evtimer_pending(&tab->loadingev, NULL))
719 		evtimer_del(&tab->loadingev);
720 
721 	stop_tab(tab);
722 
723 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
724 		t = TAILQ_NEXT(tab, tabs);
725 	TAILQ_REMOVE(&tabshead, tab, tabs);
726 	free(tab);
727 
728 	switch_to_tab(t);
729 }
730 
731 static void
732 cmd_tab_close_other(struct window *window)
733 {
734 	struct tab *t, *i;
735 
736 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
737 		if (t->flags & TAB_CURRENT)
738 			continue;
739 
740 		stop_tab(t);
741 		TAILQ_REMOVE(&tabshead, t, tabs);
742 		free(t);
743 	}
744 }
745 
746 static void
747 cmd_tab_new(struct window *window)
748 {
749 	new_tab(NEW_TAB_URL);
750 }
751 
752 static void
753 cmd_tab_next(struct window *window)
754 {
755 	struct tab *tab, *t;
756 
757 	tab = current_tab();
758 	tab->flags &= ~TAB_CURRENT;
759 
760 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
761 		t = TAILQ_FIRST(&tabshead);
762 	t->flags |= TAB_CURRENT;
763 }
764 
765 static void
766 cmd_tab_previous(struct window *window)
767 {
768 	struct tab *tab, *t;
769 
770 	tab = current_tab();
771 	tab->flags &= ~TAB_CURRENT;
772 
773 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
774 		t = TAILQ_LAST(&tabshead, tabshead);
775 	t->flags |= TAB_CURRENT;
776 }
777 
778 static void
779 cmd_tab_move(struct window *window)
780 {
781 	struct tab *tab, *t;
782 
783 	tab = current_tab();
784 	t = TAILQ_NEXT(tab, tabs);
785 	TAILQ_REMOVE(&tabshead, tab, tabs);
786 
787 	if (t == NULL)
788 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
789 	else
790 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
791 }
792 
793 static void
794 cmd_tab_move_to(struct window *window)
795 {
796 	struct tab *tab, *t;
797 
798 	tab = current_tab();
799 	t = TAILQ_PREV(tab, tabshead, tabs);
800 	TAILQ_REMOVE(&tabshead, tab, tabs);
801 
802 	if (t == NULL) {
803 		if (TAILQ_EMPTY(&tabshead))
804 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
805 		else
806 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
807 	} else
808 		TAILQ_INSERT_BEFORE(t, tab, tabs);
809 }
810 
811 static void
812 cmd_load_url(struct window *window)
813 {
814 	if (in_minibuffer) {
815 		message("We don't have enable-recursive-minibuffers");
816 		return;
817 	}
818 
819 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
820 	    &lu_history);
821 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
822 }
823 
824 static void
825 cmd_load_current_url(struct window *window)
826 {
827 	struct tab *tab = current_tab();
828 
829 	if (in_minibuffer) {
830 		message("We don't have enable-recursive-minibuffers");
831 		return;
832 	}
833 
834 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
835 	    &lu_history);
836 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
837 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
838 	ministate.window.cpoff = utf8_cplen(ministate.buf);
839 }
840 
841 static void
842 cmd_bookmark_page(struct window *window)
843 {
844 	struct tab *tab = current_tab();
845 
846 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
847 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
848 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
849 	ministate.window.cpoff = utf8_cplen(ministate.buf);
850 }
851 
852 static void
853 cmd_goto_bookmarks(struct window *window)
854 {
855 	load_url_in_tab(current_tab(), "about:bookmarks");
856 }
857 
858 static void
859 cmd_mini_delete_char(struct window *window)
860 {
861 	char *c, *n;
862 
863 	if (!in_minibuffer) {
864 		message("text is read-only");
865 		return;
866 	}
867 
868 	minibuffer_taint_hist();
869 
870 	c = utf8_nth(window->current_line->line, window->cpoff);
871 	if (*c == '\0')
872 		return;
873 	n = utf8_next_cp(c);
874 
875 	memmove(c, n, strlen(n)+1);
876 }
877 
878 static void
879 cmd_mini_delete_backward_char(struct window *window)
880 {
881 	char *c, *p, *start;
882 
883 	if (!in_minibuffer) {
884 		message("text is read-only");
885 		return;
886 	}
887 
888 	minibuffer_taint_hist();
889 
890 	c = utf8_nth(window->current_line->line, window->cpoff);
891 	start = window->current_line->line;
892 	if (c == start)
893 		return;
894 	p = utf8_prev_cp(c-1, start);
895 
896 	memmove(p, c, strlen(c)+1);
897 	window->cpoff--;
898 }
899 
900 static void
901 cmd_mini_kill_line(struct window *window)
902 {
903 	char *c;
904 
905 	if (!in_minibuffer) {
906 		message("text is read-only");
907 		return;
908 	}
909 
910 	minibuffer_taint_hist();
911 	c = utf8_nth(window->current_line->line, window->cpoff);
912 	*c = '\0';
913 }
914 
915 static void
916 cmd_mini_abort(struct window *window)
917 {
918 	if (!in_minibuffer)
919 		return;
920 
921 	ministate.abortfn();
922 }
923 
924 static void
925 cmd_mini_complete_and_exit(struct window *window)
926 {
927 	if (!in_minibuffer)
928 		return;
929 
930 	minibuffer_taint_hist();
931 	ministate.donefn();
932 }
933 
934 static void
935 cmd_mini_previous_history_element(struct window *window)
936 {
937 	if (ministate.history == NULL) {
938 		message("No history");
939 		return;
940 	}
941 
942 	if (ministate.hist_cur == NULL ||
943 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
944 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
945 		ministate.hist_off = ministate.history->len - 1;
946 		if (ministate.hist_cur == NULL)
947 			message("No prev item");
948 	} else {
949 		ministate.hist_off--;
950 	}
951 
952 	if (ministate.hist_cur != NULL)
953 		window->current_line->line = ministate.hist_cur->h;
954 }
955 
956 static void
957 cmd_mini_next_history_element(struct window *window)
958 {
959 	if (ministate.history == NULL) {
960 		message("No history");
961 		return;
962 	}
963 
964 	if (ministate.hist_cur == NULL ||
965 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
966 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
967 		ministate.hist_off = 0;
968 		if (ministate.hist_cur == NULL)
969 			message("No next item");
970 	} else {
971 		ministate.hist_off++;
972 	}
973 
974 	if (ministate.hist_cur != NULL)
975 		window->current_line->line = ministate.hist_cur->h;
976 }
977 
978 static void
979 global_key_unbound(void)
980 {
981 	message("%s is undefined", keybuf);
982 }
983 
984 static void
985 minibuffer_hist_save_entry(void)
986 {
987 	struct hist	*hist;
988 
989 	if (ministate.history == NULL)
990 		return;
991 
992 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
993 		abort();
994 
995 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
996 
997 	if (TAILQ_EMPTY(&ministate.history->head))
998 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
999 	else
1000 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1001 	ministate.history->len++;
1002 }
1003 
1004 /*
1005  * taint the minibuffer cache: if we're currently showing a history
1006  * element, copy that to the current buf and reset the "history
1007  * navigation" thing.
1008  */
1009 static void
1010 minibuffer_taint_hist(void)
1011 {
1012 	if (ministate.hist_cur == NULL)
1013 		return;
1014 
1015 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1016 	ministate.hist_cur = NULL;
1017 }
1018 
1019 static void
1020 minibuffer_self_insert(void)
1021 {
1022 	char	*c, tmp[5] = {0};
1023 	size_t	len;
1024 
1025 	minibuffer_taint_hist();
1026 
1027 	if (thiskey.cp == 0)
1028 		return;
1029 
1030 	len = utf8_encode(thiskey.cp, tmp);
1031 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1032 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1033 		return;
1034 
1035 	memmove(c + len, c, strlen(c)+1);
1036 	memcpy(c, tmp, len);
1037 	ministate.window.cpoff++;
1038 }
1039 
1040 static void
1041 eecmd_self_insert(void)
1042 {
1043 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1044 	    !unicode_isgraph(thiskey.cp)) {
1045 		global_key_unbound();
1046 		return;
1047 	}
1048 
1049 	minibuffer_self_insert();
1050 }
1051 
1052 static void
1053 eecmd_select(void)
1054 {
1055 	struct cmds *cmd;
1056 
1057 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1058 		if (!strcmp(cmd->cmd, ministate.buf)) {
1059 			exit_minibuffer();
1060 			minibuffer_hist_save_entry();
1061 			cmd->fn(current_window());
1062 			return;
1063 		}
1064 	}
1065 
1066 	message("No match");
1067 }
1068 
1069 static void
1070 ir_self_insert(void)
1071 {
1072 	minibuffer_self_insert();
1073 }
1074 
1075 static void
1076 ir_select(void)
1077 {
1078 	char		 buf[1025] = {0};
1079 	struct url	 url;
1080 	struct tab	*tab;
1081 
1082 	tab = current_tab();
1083 
1084 	exit_minibuffer();
1085 	minibuffer_hist_save_entry();
1086 
1087 	/* a bit ugly but... */
1088 	memcpy(&url, &tab->url, sizeof(tab->url));
1089 	url_set_query(&url, ministate.buf);
1090 	url_unparse(&url, buf, sizeof(buf));
1091 	load_url_in_tab(tab, buf);
1092 }
1093 
1094 static void
1095 lu_self_insert(void)
1096 {
1097 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1098 	    !unicode_isgraph(thiskey.key)) {
1099 		global_key_unbound();
1100 		return;
1101 	}
1102 
1103 	minibuffer_self_insert();
1104 }
1105 
1106 static void
1107 lu_select(void)
1108 {
1109 	exit_minibuffer();
1110 	minibuffer_hist_save_entry();
1111 	load_url_in_tab(current_tab(), ministate.buf);
1112 }
1113 
1114 static void
1115 bp_select(void)
1116 {
1117 	exit_minibuffer();
1118 	if (*ministate.buf != '\0')
1119 		add_to_bookmarks(ministate.buf);
1120 	else
1121 		message("Abort.");
1122 }
1123 
1124 static void
1125 yornp_self_insert(void)
1126 {
1127 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1128 		message("Please answer y or n");
1129 		return;
1130 	}
1131 
1132 	yornp_cb(thiskey.key == 'y', current_tab()->id);
1133 	exit_minibuffer();
1134 }
1135 
1136 static void
1137 yornp_abort(void)
1138 {
1139 	yornp_cb(0, current_tab()->id);
1140 	exit_minibuffer();
1141 }
1142 
1143 static struct vline *
1144 nth_line(struct window *window, size_t n)
1145 {
1146 	struct vline	*vl;
1147 	size_t		 i;
1148 
1149 	i = 0;
1150 	TAILQ_FOREACH(vl, &window->head, vlines) {
1151 		if (i == n)
1152 			return vl;
1153 		i++;
1154 	}
1155 
1156 	/* unreachable */
1157 	abort();
1158 }
1159 
1160 static struct tab *
1161 current_tab(void)
1162 {
1163 	struct tab *t;
1164 
1165 	TAILQ_FOREACH(t, &tabshead, tabs) {
1166 		if (t->flags & TAB_CURRENT)
1167 			return t;
1168 	}
1169 
1170 	/* unreachable */
1171 	abort();
1172 }
1173 
1174 static struct window *
1175 current_window(void)
1176 {
1177 	if (in_minibuffer)
1178 		return &ministate.window;
1179 	return &current_tab()->window;
1180 }
1181 
1182 static int
1183 readkey(void)
1184 {
1185 	uint32_t state = 0;
1186 
1187 	if ((thiskey.key = wgetch(body)) == ERR)
1188 		return 0;
1189 
1190 	thiskey.meta = thiskey.key == 27;
1191 	if (thiskey.meta) {
1192 		thiskey.key = wgetch(body);
1193 		if (thiskey.key == ERR || thiskey.key == 27) {
1194 			thiskey.meta = 0;
1195 			thiskey.key = 27;
1196 		}
1197 	}
1198 
1199 	thiskey.cp = 0;
1200 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1201 		while (1) {
1202 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1203 				break;
1204 			if ((thiskey.key = wgetch(body)) == ERR) {
1205 				message("Error decoding user input");
1206 				return 0;
1207 			}
1208 		}
1209 	}
1210 
1211 	return 1;
1212 }
1213 
1214 static void
1215 dispatch_stdio(int fd, short ev, void *d)
1216 {
1217 	struct keymap	*k;
1218 	const char	*keyname;
1219 	char		 tmp[5] = {0};
1220 
1221 	if (!readkey())
1222 		return;
1223 
1224 	if (keybuf[0] != '\0')
1225 		strlcat(keybuf, " ", sizeof(keybuf));
1226 	if (thiskey.meta)
1227 		strlcat(keybuf, "M-", sizeof(keybuf));
1228 	if (thiskey.cp != 0) {
1229 		utf8_encode(thiskey.cp, tmp);
1230 		strlcat(keybuf, tmp, sizeof(keybuf));
1231 	} else {
1232 		if ((keyname = unkbd(thiskey.key)) != NULL)
1233 			strlcat(keybuf, keyname, sizeof(keybuf));
1234 		else {
1235 			tmp[0] = thiskey.key;
1236 			strlcat(keybuf, tmp, sizeof(keybuf));
1237 		}
1238 	}
1239 
1240 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1241 		if (k->meta == thiskey.meta &&
1242 		    k->key == thiskey.key) {
1243 			if (k->fn == NULL)
1244 				current_map = &k->map;
1245 			else {
1246 				current_map = base_map;
1247 				strlcpy(keybuf, "", sizeof(keybuf));
1248 				k->fn(current_window());
1249 			}
1250 			goto done;
1251 		}
1252 	}
1253 
1254 	if (current_map->unhandled_input != NULL)
1255 		current_map->unhandled_input();
1256 	else {
1257 		global_key_unbound();
1258 	}
1259 
1260 	strlcpy(keybuf, "", sizeof(keybuf));
1261 	current_map = base_map;
1262 
1263 done:
1264 	redraw_tab(current_tab());
1265 }
1266 
1267 static void
1268 handle_clear_minibuf(int fd, short ev, void *d)
1269 {
1270 	free(ministate.curmesg);
1271 	ministate.curmesg = NULL;
1272 
1273 	redraw_minibuffer();
1274 	if (in_minibuffer) {
1275 		wrefresh(body);
1276 		wrefresh(minibuf);
1277 	} else {
1278 		wrefresh(minibuf);
1279 		wrefresh(body);
1280 	}
1281 }
1282 
1283 static void
1284 handle_resize(int sig, short ev, void *d)
1285 {
1286 	struct tab	*tab;
1287 
1288 	endwin();
1289 	refresh();
1290 	clear();
1291 
1292 	/* move and resize the windows, in reverse order! */
1293 
1294 	mvwin(minibuf, LINES-1, 0);
1295 	wresize(minibuf, 1, COLS);
1296 
1297 	mvwin(modeline, LINES-2, 0);
1298 	wresize(modeline, 1, COLS);
1299 
1300 	wresize(body, LINES-3, COLS);
1301 	body_lines = LINES-3;
1302 	body_cols = COLS;
1303 
1304 	wresize(tabline, 1, COLS);
1305 
1306 	tab = current_tab();
1307 
1308 	wrap_page(&tab->window);
1309 	redraw_tab(tab);
1310 }
1311 
1312 static int
1313 wrap_page(struct window *window)
1314 {
1315 	struct line		*l;
1316 	const struct line	*orig;
1317 	struct vline		*vl;
1318 	const char		*prfx;
1319 
1320 	orig = window->current_line == NULL
1321 		? NULL
1322 		: window->current_line->parent;
1323 	window->current_line = NULL;
1324 
1325 	window->curs_y = 0;
1326 	window->line_off = 0;
1327 
1328 	empty_vlist(window);
1329 
1330 	TAILQ_FOREACH(l, &window->page.head, lines) {
1331 		prfx = line_prefixes[l->type].prfx1;
1332 		switch (l->type) {
1333 		case LINE_TEXT:
1334 		case LINE_LINK:
1335 		case LINE_TITLE_1:
1336 		case LINE_TITLE_2:
1337 		case LINE_TITLE_3:
1338 		case LINE_ITEM:
1339 		case LINE_QUOTE:
1340 		case LINE_PRE_START:
1341 		case LINE_PRE_END:
1342 			wrap_text(window, prfx, l, body_cols);
1343 			break;
1344 		case LINE_PRE_CONTENT:
1345                         hardwrap_text(window, l, body_cols);
1346 			break;
1347 		}
1348 
1349 		if (orig == l && window->current_line == NULL) {
1350 			window->line_off = window->line_max-1;
1351 			window->current_line = TAILQ_LAST(&window->head, vhead);
1352 
1353 			while (1) {
1354 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1355 				if (vl == NULL || vl->parent != orig)
1356 					break;
1357 				window->current_line = vl;
1358 				window->line_off--;
1359 			}
1360 		}
1361 	}
1362 
1363         if (window->current_line == NULL)
1364 		window->current_line = TAILQ_FIRST(&window->head);
1365 
1366 	return 1;
1367 }
1368 
1369 static void
1370 print_vline(struct vline *vl)
1371 {
1372 	const char *text = vl->line;
1373 	const char *prfx;
1374 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1375 	int text_face = line_faces[vl->parent->type].text_prop;
1376 
1377 	if (!vl->flags)
1378 		prfx = line_prefixes[vl->parent->type].prfx1;
1379 	else
1380 		prfx = line_prefixes[vl->parent->type].prfx2;
1381 
1382 	if (text == NULL)
1383 		text = "";
1384 
1385 	wattron(body, prefix_face);
1386 	wprintw(body, "%s", prfx);
1387 	wattroff(body, prefix_face);
1388 
1389 	wattron(body, text_face);
1390 	wprintw(body, "%s", text);
1391 	wattroff(body, text_face);
1392 }
1393 
1394 static void
1395 redraw_tabline(void)
1396 {
1397 	struct tab	*tab;
1398 	size_t		 toskip;
1399 	int		 current, x, y, truncated;
1400 	const char	*title;
1401 	char		 buf[25];
1402 
1403 	toskip = 0;
1404 	x = 1;
1405 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1406 		x += sizeof(buf) + 1;
1407 		toskip++;
1408 		if (tab->flags & TAB_CURRENT)
1409 			break;
1410 	}
1411 	if (x < COLS-2)
1412 		toskip = 0;
1413 	else
1414 		toskip--;
1415 
1416 	werase(tabline);
1417 	wattron(tabline, tab_face.background);
1418 	wprintw(tabline, toskip == 0 ? " " : "<");
1419 	wattroff(tabline, tab_face.background);
1420 
1421 	truncated = 0;
1422 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1423 		if (truncated)
1424 			break;
1425 		if (toskip != 0) {
1426 			toskip--;
1427 			continue;
1428 		}
1429 
1430 		getyx(tabline, y, x);
1431 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1432 			truncated = 1;
1433 
1434 		current = tab->flags & TAB_CURRENT;
1435 
1436 		if (*(title = tab->window.page.title) == '\0')
1437 			title = tab->hist_cur->h;
1438 
1439 		strlcpy(buf, " ", sizeof(buf));
1440                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1441 			/* truncation happens */
1442 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1443 		} else {
1444 			/* pad with spaces */
1445 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1446 				/* nop */ ;
1447 		}
1448 
1449 		if (current)
1450 			wattron(tabline, tab_face.current_tab);
1451 		else
1452 			wattron(tabline, tab_face.tab);
1453 
1454 		wprintw(tabline, "%s", buf);
1455 		if (TAILQ_NEXT(tab, tabs) != NULL)
1456 			wprintw(tabline, " ");
1457 
1458 		if (current)
1459 			wattroff(tabline, tab_face.current_tab);
1460 		else
1461 			wattroff(tabline, tab_face.tab);
1462 	}
1463 
1464 	wattron(tabline, tab_face.background);
1465 	for (; x < COLS; ++x)
1466 		waddch(tabline, ' ');
1467 	if (truncated)
1468 		mvwprintw(tabline, 0, COLS-1, ">");
1469 }
1470 
1471 static inline char
1472 trust_status_char(enum trust_state ts)
1473 {
1474 	switch (ts) {
1475 	case TS_UNKNOWN:	return 'u';
1476 	case TS_UNTRUSTED:	return '!';
1477 	case TS_TRUSTED:	return 'v';
1478 	case TS_VERIFIED:	return 'V';
1479 	}
1480 }
1481 
1482 static void
1483 redraw_modeline(struct tab *tab)
1484 {
1485 	double		 pct;
1486 	int		 x, y, max_x, max_y;
1487 	const char	*mode = tab->window.page.name;
1488 	const char	*spin = "-\\|/";
1489 
1490 	werase(modeline);
1491 	wattron(modeline, A_REVERSE);
1492 	wmove(modeline, 0, 0);
1493 
1494 	wprintw(modeline, "-%c%c %s ",
1495 	    spin[tab->loading_anim_step],
1496 	    trust_status_char(tab->trust),
1497 	    mode == NULL ? "(none)" : mode);
1498 
1499 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1500 
1501 	if (tab->window.line_max <= (size_t)body_lines)
1502                 wprintw(modeline, "All ");
1503 	else if (tab->window.line_off == 0)
1504                 wprintw(modeline, "Top ");
1505 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1506 		wprintw(modeline, "Bottom ");
1507 	else
1508 		wprintw(modeline, "%.0f%% ", pct);
1509 
1510 	wprintw(modeline, "%d/%d %s ",
1511 	    tab->window.line_off + tab->window.curs_y,
1512 	    tab->window.line_max,
1513 	    tab->hist_cur->h);
1514 
1515 	getyx(modeline, y, x);
1516 	getmaxyx(modeline, max_y, max_x);
1517 
1518 	(void)y;
1519 	(void)max_y;
1520 
1521 	for (; x < max_x; ++x)
1522 		waddstr(modeline, "-");
1523 }
1524 
1525 static void
1526 redraw_minibuffer(void)
1527 {
1528 	struct tab *tab;
1529 	size_t off_y, off_x = 0;
1530 	char *start, *c;
1531 
1532 	werase(minibuf);
1533 
1534 	if (in_minibuffer) {
1535 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1536 		if (ministate.hist_cur != NULL)
1537 			wprintw(minibuf, "(%zu/%zu) ",
1538 			    ministate.hist_off + 1,
1539 			    ministate.history->len);
1540 
1541 		getyx(minibuf, off_y, off_x);
1542 
1543 		start = ministate.hist_cur != NULL
1544 			? ministate.hist_cur->h
1545 			: ministate.buf;
1546 		c = utf8_nth(ministate.window.current_line->line,
1547 		    ministate.window.cpoff);
1548 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1549 			start = utf8_next_cp(start);
1550 		}
1551 
1552 		waddstr(minibuf, start);
1553 	}
1554 
1555 	if (ministate.curmesg != NULL)
1556                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1557 		    ministate.curmesg);
1558 
1559 	if (!in_minibuffer && ministate.curmesg == NULL)
1560 		waddstr(minibuf, keybuf);
1561 
1562 	/* If nothing else, show the URL at point */
1563 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1564 		tab = current_tab();
1565 		if (tab->window.current_line != NULL &&
1566 		    tab->window.current_line->parent->type == LINE_LINK)
1567 			waddstr(minibuf, tab->window.current_line->parent->alt);
1568 	}
1569 
1570 	if (in_minibuffer)
1571 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1572 }
1573 
1574 static void
1575 redraw_tab(struct tab *tab)
1576 {
1577 	redraw_tabline();
1578 	redraw_body(tab);
1579 	redraw_modeline(tab);
1580 	redraw_minibuffer();
1581 
1582 	wrefresh(tabline);
1583 	wrefresh(modeline);
1584 
1585 	if (in_minibuffer) {
1586 		wrefresh(body);
1587 		wrefresh(minibuf);
1588 	} else {
1589 		wrefresh(minibuf);
1590 		wrefresh(body);
1591 	}
1592 }
1593 
1594 static void
1595 redraw_body(struct tab *tab)
1596 {
1597 	struct vline	*vl;
1598 	int		 line;
1599 
1600 	werase(body);
1601 
1602 	tab->window.line_off = MIN(tab->window.line_max-1, tab->window.line_off);
1603 	if (TAILQ_EMPTY(&tab->window.head))
1604 		return;
1605 
1606 	line = 0;
1607 	vl = nth_line(&tab->window, tab->window.line_off);
1608 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1609 		wmove(body, line, 0);
1610 		print_vline(vl);
1611 		line++;
1612 		if (line == body_lines)
1613 			break;
1614 	}
1615 
1616 	wmove(body, tab->window.curs_y, tab->window.curs_x);
1617 }
1618 
1619 static void
1620 vmessage(const char *fmt, va_list ap)
1621 {
1622 	if (evtimer_pending(&clminibufev, NULL))
1623 		evtimer_del(&clminibufev);
1624 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1625 	evtimer_add(&clminibufev, &clminibufev_timer);
1626 
1627 	free(ministate.curmesg);
1628 
1629 	/* TODO: what to do if the allocation fails here? */
1630 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1631 		ministate.curmesg = NULL;
1632 
1633 	redraw_minibuffer();
1634 	if (in_minibuffer) {
1635 		wrefresh(body);
1636 		wrefresh(minibuf);
1637 	} else {
1638 		wrefresh(minibuf);
1639 		wrefresh(body);
1640 	}
1641 }
1642 
1643 static void
1644 message(const char *fmt, ...)
1645 {
1646 	va_list ap;
1647 
1648 	va_start(ap, fmt);
1649 	vmessage(fmt, ap);
1650 	va_end(ap);
1651 }
1652 
1653 static void
1654 start_loading_anim(struct tab *tab)
1655 {
1656 	if (tab->loading_anim)
1657 		return;
1658 	tab->loading_anim = 1;
1659 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1660 	evtimer_add(&tab->loadingev, &loadingev_timer);
1661 }
1662 
1663 static void
1664 update_loading_anim(int fd, short ev, void *d)
1665 {
1666 	struct tab	*tab = d;
1667 
1668 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1669 
1670 	if (tab->flags & TAB_CURRENT) {
1671 		redraw_modeline(tab);
1672 		wrefresh(modeline);
1673 		wrefresh(body);
1674 		if (in_minibuffer)
1675 			wrefresh(minibuf);
1676 	}
1677 
1678 	evtimer_add(&tab->loadingev, &loadingev_timer);
1679 }
1680 
1681 static void
1682 stop_loading_anim(struct tab *tab)
1683 {
1684 	if (!tab->loading_anim)
1685 		return;
1686 	evtimer_del(&tab->loadingev);
1687 	tab->loading_anim = 0;
1688 	tab->loading_anim_step = 0;
1689 
1690 	if (!(tab->flags & TAB_CURRENT))
1691 		return;
1692 
1693 	redraw_modeline(tab);
1694 
1695 	wrefresh(modeline);
1696 	wrefresh(body);
1697 	if (in_minibuffer)
1698 		wrefresh(minibuf);
1699 }
1700 
1701 static void
1702 load_url_in_tab(struct tab *tab, const char *url)
1703 {
1704 	empty_vlist(&tab->window);
1705 	message("Loading %s...", url);
1706 	start_loading_anim(tab);
1707 	load_url(tab, url);
1708 
1709 	tab->window.curs_x = 0;
1710 	tab->window.curs_y = 0;
1711 	redraw_tab(tab);
1712 }
1713 
1714 static void
1715 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1716     void (*abortfn)(void), struct histhead *hist)
1717 {
1718 	in_minibuffer = 1;
1719 	base_map = &minibuffer_map;
1720 	current_map = &minibuffer_map;
1721 
1722 	base_map->unhandled_input = self_insert_fn;
1723 
1724 	ministate.donefn = donefn;
1725 	ministate.abortfn = abortfn;
1726 	memset(ministate.buf, 0, sizeof(ministate.buf));
1727 	ministate.window.current_line = &ministate.vline;
1728 	ministate.window.current_line->line = ministate.buf;
1729 	ministate.window.cpoff = 0;
1730 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1731 
1732 	ministate.history = hist;
1733 	ministate.hist_cur = NULL;
1734 	ministate.hist_off = 0;
1735 }
1736 
1737 static void
1738 exit_minibuffer(void)
1739 {
1740 	werase(minibuf);
1741 
1742 	in_minibuffer = 0;
1743 	base_map = &global_map;
1744 	current_map = &global_map;
1745 }
1746 
1747 static void
1748 switch_to_tab(struct tab *tab)
1749 {
1750 	struct tab	*t;
1751 
1752 	TAILQ_FOREACH(t, &tabshead, tabs) {
1753 		t->flags &= ~TAB_CURRENT;
1754 	}
1755 
1756 	tab->flags |= TAB_CURRENT;
1757 }
1758 
1759 static struct tab *
1760 new_tab(const char *url)
1761 {
1762 	struct tab	*tab;
1763 
1764 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1765 		event_loopbreak();
1766 		return NULL;
1767 	}
1768 
1769 	TAILQ_INIT(&tab->hist.head);
1770 
1771 	TAILQ_INIT(&tab->window.head);
1772 
1773 	tab->id = tab_counter++;
1774 	switch_to_tab(tab);
1775 
1776 	if (TAILQ_EMPTY(&tabshead))
1777 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1778 	else
1779 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1780 
1781 	load_url_in_tab(tab, url);
1782 	return tab;
1783 }
1784 
1785 static void
1786 usage(void)
1787 {
1788 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1789 }
1790 
1791 int
1792 ui_init(int argc, char * const *argv)
1793 {
1794 	const char *url = NEW_TAB_URL;
1795 	int ch;
1796 
1797 	while ((ch = getopt(argc, argv, "")) != -1) {
1798 		switch (ch) {
1799 		default:
1800 			usage();
1801 			return 0;
1802 		}
1803 	}
1804 	argc -= optind;
1805 	argv += optind;
1806 
1807 	if (argc != 0)
1808 		url = argv[0];
1809 
1810 	setlocale(LC_ALL, "");
1811 
1812 	TAILQ_INIT(&global_map.m);
1813 	global_map.unhandled_input = global_key_unbound;
1814 
1815 	TAILQ_INIT(&minibuffer_map.m);
1816 
1817 	TAILQ_INIT(&eecmd_history.head);
1818 	TAILQ_INIT(&ir_history.head);
1819 	TAILQ_INIT(&lu_history.head);
1820 
1821 	ministate.line.type = LINE_TEXT;
1822 	ministate.vline.parent = &ministate.line;
1823 	ministate.window.current_line = &ministate.vline;
1824 
1825 	base_map = &global_map;
1826 	current_map = &global_map;
1827 	load_default_keys();
1828 
1829 	initscr();
1830 	raw();
1831 	noecho();
1832 
1833 	nonl();
1834 	intrflush(stdscr, FALSE);
1835 
1836 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1837 		return 0;
1838 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1839 		return 0;
1840 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1841 		return 0;
1842 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1843 		return 0;
1844 
1845 	body_lines = LINES-3;
1846 	body_cols = COLS;
1847 
1848 	keypad(body, TRUE);
1849 	scrollok(body, TRUE);
1850 
1851 	/* non-blocking input */
1852 	wtimeout(body, 0);
1853 
1854 	mvwprintw(body, 0, 0, "");
1855 
1856 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1857 	event_add(&stdioev, NULL);
1858 
1859 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1860 	signal_add(&winchev, NULL);
1861 
1862 	new_tab(url);
1863 
1864 	return 1;
1865 }
1866 
1867 void
1868 ui_on_tab_loaded(struct tab *tab)
1869 {
1870 	stop_loading_anim(tab);
1871 	message("Loaded %s", tab->hist_cur->h);
1872 
1873 	redraw_tabline();
1874 	wrefresh(tabline);
1875 	if (in_minibuffer)
1876 		wrefresh(minibuf);
1877 	else
1878 		wrefresh(body);
1879 }
1880 
1881 void
1882 ui_on_tab_refresh(struct tab *tab)
1883 {
1884 	wrap_page(&tab->window);
1885 	if (tab->flags & TAB_CURRENT) {
1886 		restore_cursor(&tab->window);
1887 		redraw_tab(tab);
1888 	}
1889 }
1890 
1891 void
1892 ui_require_input(struct tab *tab, int hide)
1893 {
1894 	/* TODO: hard-switching to another tab is ugly */
1895 	switch_to_tab(tab);
1896 
1897 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
1898 	    &ir_history);
1899 	strlcpy(ministate.prompt, "Input required: ",
1900 	    sizeof(ministate.prompt));
1901 	redraw_tab(tab);
1902 }
1903 
1904 void
1905 ui_yornp(const char *prompt, void (*fn)(int, unsigned int))
1906 {
1907 	size_t len;
1908 
1909 	yornp_cb = fn;
1910 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
1911 	    yornp_abort, NULL);
1912 
1913 	len = sizeof(ministate.prompt);
1914 	strlcpy(ministate.prompt, prompt, len);
1915 	strlcat(ministate.prompt, " (y or n) ", len);
1916 	redraw_tab(current_tab());
1917 }
1918 
1919 void
1920 ui_notify(const char *fmt, ...)
1921 {
1922 	va_list ap;
1923 
1924 	va_start(ap, fmt);
1925 	vmessage(fmt, ap);
1926 	va_end(ap);
1927 }
1928 
1929 void
1930 ui_end(void)
1931 {
1932 	endwin();
1933 }