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Date:: Thu Apr 1 08:00:33 2021 UTC
Message:: free page contents on do_load_link to do that, move empty_vlist to wrap.c and provide a similar function for struct line*s.
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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 <assert.h>
40 #include <curses.h>
41 #include <event.h>
42 #include <locale.h>
43 #include <signal.h>
44 #include <stdarg.h>
45 #include <stdlib.h>
46 #include <string.h>
47 #include <unistd.h>
48 
49 #define TAB_CURRENT	0x1
50 
51 #define NEW_TAB_URL	"about:new"
52 
53 static struct event	stdioev, winchev;
54 
55 static void		 load_default_keys(void);
56 static void		 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 CMD(cmd_toggle_help);
96 
97 CMD(cmd_mini_delete_char);
98 CMD(cmd_mini_delete_backward_char);
99 CMD(cmd_mini_kill_line);
100 CMD(cmd_mini_abort);
101 CMD(cmd_mini_complete_and_exit);
102 CMD(cmd_mini_previous_history_element);
103 CMD(cmd_mini_next_history_element);
104 
105 #include "cmd.gen.h"
106 
107 static void		 global_key_unbound(void);
108 static void		 minibuffer_hist_save_entry(void);
109 static void		 minibuffer_taint_hist(void);
110 static void		 minibuffer_self_insert(void);
111 static void		 eecmd_self_insert(void);
112 static void		 eecmd_select(void);
113 static void		 ir_self_insert(void);
114 static void		 ir_select(void);
115 static void		 lu_self_insert(void);
116 static void		 lu_select(void);
117 static void		 bp_select(void);
118 static void		 yornp_self_insert(void);
119 static void		 yornp_abort(void);
120 
121 static struct vline	*nth_line(struct window*, size_t);
122 static struct tab	*current_tab(void);
123 static struct window	*current_window(void);
124 static int		 readkey(void);
125 static void		 dispatch_stdio(int, short, void*);
126 static void		 handle_clear_minibuf(int, short, void*);
127 static void		 handle_resize(int, short, void*);
128 static int		 wrap_page(struct window*, int);
129 static void		 print_vline(WINDOW*, struct vline*);
130 static void		 redraw_tabline(void);
131 static void		 redraw_window(WINDOW*, int, struct window*);
132 static void		 redraw_help(void);
133 static void		 redraw_body(struct tab*);
134 static void		 redraw_modeline(struct tab*);
135 static void		 redraw_minibuffer(void);
136 static void		 redraw_tab(struct tab*);
137 static void		 emit_help_item(char*, void*);
138 static void		 rec_compute_help(struct kmap*, char*, size_t);
139 static void		 recompute_help(void);
140 static void		 vmessage(const char*, va_list);
141 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
142 static void		 start_loading_anim(struct tab*);
143 static void		 update_loading_anim(int, short, void*);
144 static void		 stop_loading_anim(struct tab*);
145 static void		 load_url_in_tab(struct tab*, const char*);
146 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
147 static void		 exit_minibuffer(void);
148 static void		 switch_to_tab(struct tab*);
149 static struct tab	*new_tab(const char*);
150 static void		 usage(void);
151 
152 static struct { short meta; int key; uint32_t cp; } thiskey;
153 
154 static WINDOW	*tabline, *body, *modeline, *minibuf;
155 static int	 body_lines, body_cols;
156 
157 static WINDOW		*help;
158 static struct window	 helpwin;
159 static int		 help_lines, help_cols;
160 
161 static int		 side_window;
162 
163 static struct event	clminibufev;
164 static struct timeval	clminibufev_timer = { 5, 0 };
165 static struct timeval	loadingev_timer = { 0, 250000 };
166 
167 static uint32_t		 tab_counter;
168 
169 static char	keybuf[64];
170 
171 static void (*yornp_cb)(int, unsigned int);
172 
173 struct kmap global_map,
174 	minibuffer_map,
175 	*current_map,
176 	*base_map;
177 
178 static struct histhead eecmd_history,
179 	ir_history,
180 	lu_history;
181 
182 static int	in_minibuffer;
183 
184 static struct {
185 	char		*curmesg;
186 
187 	char		 prompt[64];
188 	void		 (*donefn)(void);
189 	void		 (*abortfn)(void);
190 
191 	char		 buf[1025];
192 	struct line	 line;
193 	struct vline	 vline;
194 	struct window	 window;
195 
196 	struct histhead	*history;
197 	struct hist	*hist_cur;
198 	size_t		 hist_off;
199 } ministate;
200 
201 struct lineprefix {
202 	const char	*prfx1;
203 	const char	*prfx2;
204 } line_prefixes[] = {
205 	[LINE_TEXT] =		{ "",		"" },
206 	[LINE_LINK] =		{ "=> ",	"   " },
207 	[LINE_TITLE_1] =	{ "# ",		"  " },
208 	[LINE_TITLE_2] =	{ "## ",	"   " },
209 	[LINE_TITLE_3] =	{ "### ",	"    " },
210 	[LINE_ITEM] =		{ "* ",		"  " },
211 	[LINE_QUOTE] =		{ "> ",		"  " },
212 	[LINE_PRE_START] =	{ "```",	"   " },
213 	[LINE_PRE_CONTENT] =	{ "",		"" },
214 	[LINE_PRE_END] =	{ "```",	"```" },
215 };
216 
217 static struct line_face {
218 	int prefix_prop;
219 	int text_prop;
220 } line_faces[] = {
221 	[LINE_TEXT] =		{ 0,		0 },
222 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
223 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
224 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
225 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
226 	[LINE_ITEM] =		{ 0,		0 },
227 	[LINE_QUOTE] =		{ 0,		A_DIM },
228 	[LINE_PRE_START] =	{ 0,		0 },
229 	[LINE_PRE_CONTENT] =	{ 0,		0 },
230 	[LINE_PRE_END] =	{ 0,		0 },
231 };
232 
233 static struct tab_face {
234 	int background, tab, current_tab;
235 } tab_face = {
236 	A_REVERSE, A_REVERSE, A_NORMAL
237 };
238 
239 static inline void
240 global_set_key(const char *key, void (*fn)(struct window*))
241 {
242 	if (!kmap_define_key(&global_map, key, fn))
243 		_exit(1);
244 }
245 
246 static inline void
247 minibuffer_set_key(const char *key, void (*fn)(struct window*))
248 {
249 	if (!kmap_define_key(&minibuffer_map, key, fn))
250 		_exit(1);
251 }
252 
253 static void
254 load_default_keys(void)
255 {
256 	/* === global map === */
257 
258 	/* emacs */
259 	global_set_key("C-p",		cmd_previous_line);
260 	global_set_key("C-n",		cmd_next_line);
261 	global_set_key("C-f",		cmd_forward_char);
262 	global_set_key("C-b",		cmd_backward_char);
263 	global_set_key("M-{",		cmd_backward_paragraph);
264 	global_set_key("M-}",		cmd_forward_paragraph);
265 	global_set_key("C-a",		cmd_move_beginning_of_line);
266 	global_set_key("C-e",		cmd_move_end_of_line);
267 
268 	global_set_key("M-v",		cmd_scroll_up);
269 	global_set_key("C-v",		cmd_scroll_down);
270 	global_set_key("M-space",	cmd_scroll_up);
271 	global_set_key("space",		cmd_scroll_down);
272 
273 	global_set_key("M-<",		cmd_beginning_of_buffer);
274 	global_set_key("M->",		cmd_end_of_buffer);
275 
276 	global_set_key("C-x C-c",	cmd_kill_telescope);
277 
278 	global_set_key("C-g",		cmd_clear_minibuf);
279 
280 	global_set_key("M-x",		cmd_execute_extended_command);
281 	global_set_key("C-x C-f",	cmd_load_url);
282 	global_set_key("C-x M-f",	cmd_load_current_url);
283 
284 	global_set_key("C-x t 0",	cmd_tab_close);
285 	global_set_key("C-x t 1",	cmd_tab_close_other);
286 	global_set_key("C-x t 2",	cmd_tab_new);
287 	global_set_key("C-x t o",	cmd_tab_next);
288 	global_set_key("C-x t O",	cmd_tab_previous);
289 	global_set_key("C-x t m",	cmd_tab_move);
290 	global_set_key("C-x t M",	cmd_tab_move_to);
291 
292 	global_set_key("C-M-b",		cmd_previous_page);
293 	global_set_key("C-M-f",		cmd_next_page);
294 
295 	global_set_key("<f7> a",	cmd_bookmark_page);
296 	global_set_key("<f7> <f7>",	cmd_goto_bookmarks);
297 
298 	/* vi/vi-like */
299 	global_set_key("k",		cmd_previous_line);
300 	global_set_key("j",		cmd_next_line);
301 	global_set_key("l",		cmd_forward_char);
302 	global_set_key("h",		cmd_backward_char);
303 	global_set_key("{",		cmd_backward_paragraph);
304 	global_set_key("}",		cmd_forward_paragraph);
305 	global_set_key("^",		cmd_move_beginning_of_line);
306 	global_set_key("$",		cmd_move_end_of_line);
307 
308 	global_set_key("K",		cmd_scroll_line_up);
309 	global_set_key("J",		cmd_scroll_line_down);
310 
311 	global_set_key("g g",		cmd_beginning_of_buffer);
312 	global_set_key("G",		cmd_end_of_buffer);
313 
314 	global_set_key("g D",		cmd_tab_close);
315 	global_set_key("g N",		cmd_tab_new);
316 	global_set_key("g t",		cmd_tab_next);
317 	global_set_key("g T",		cmd_tab_previous);
318 	global_set_key("g M-t",		cmd_tab_move);
319 	global_set_key("g M-T",		cmd_tab_move_to);
320 
321 	global_set_key("H",		cmd_previous_page);
322 	global_set_key("L",		cmd_next_page);
323 
324 	/* tmp */
325 	global_set_key("q",		cmd_kill_telescope);
326 
327 	global_set_key("esc",		cmd_clear_minibuf);
328 
329 	global_set_key(":",		cmd_execute_extended_command);
330 
331 	/* cua */
332 	global_set_key("<up>",		cmd_previous_line);
333 	global_set_key("<down>",	cmd_next_line);
334 	global_set_key("<right>",	cmd_forward_char);
335 	global_set_key("<left>",	cmd_backward_char);
336 	global_set_key("<prior>",	cmd_scroll_up);
337 	global_set_key("<next>",	cmd_scroll_down);
338 
339 	global_set_key("M-<left>",	cmd_previous_page);
340 	global_set_key("M-<right>",	cmd_next_page);
341 
342 	/* "ncurses standard" */
343 	global_set_key("C-l",		cmd_redraw);
344 
345 	/* global */
346 	global_set_key("<f1>",		cmd_toggle_help);
347 	global_set_key("C-m",		cmd_push_button);
348 	global_set_key("M-enter",	cmd_push_button_new_tab);
349 	global_set_key("M-tab",		cmd_previous_button);
350 	global_set_key("tab",		cmd_next_button);
351 
352 	/* === minibuffer map === */
353 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
354 	minibuffer_set_key("C-g",		cmd_mini_abort);
355 	minibuffer_set_key("esc",		cmd_mini_abort);
356 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
357 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
358 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
359 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
360 
361 	minibuffer_set_key("C-b",		cmd_backward_char);
362 	minibuffer_set_key("C-f",		cmd_forward_char);
363 	minibuffer_set_key("<left>",		cmd_backward_char);
364 	minibuffer_set_key("<right>",		cmd_forward_char);
365 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
366 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
367 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
368 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
369 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
370 
371 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
372 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
373 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
374 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
375 }
376 
377 static void
378 restore_cursor(struct window *window)
379 {
380 	struct vline	*vl;
381 	const char	*prfx;
382 
383 	vl = window->current_line;
384 	if (vl == NULL || vl->line == NULL)
385 		window->curs_x = window->cpoff = 0;
386 	else
387 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
388 
389 	if (vl != NULL) {
390 		prfx = line_prefixes[vl->parent->type].prfx1;
391 		window->curs_x += utf8_swidth(prfx);
392 	}
393 }
394 
395 static void
396 cmd_previous_line(struct window *window)
397 {
398 	struct vline	*vl;
399 
400 	if (window->current_line == NULL
401 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
402 		return;
403 
404 	if (--window->curs_y < 0) {
405 		window->curs_y = 0;
406 		cmd_scroll_line_up(window);
407 		return;
408 	}
409 
410 	window->current_line = vl;
411 	restore_cursor(window);
412 }
413 
414 static void
415 cmd_next_line(struct window *window)
416 {
417 	struct vline	*vl;
418 
419 	if (window->current_line == NULL
420 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
421 		return;
422 
423 	if (++window->curs_y > body_lines-1) {
424 		window->curs_y = body_lines-1;
425 		cmd_scroll_line_down(window);
426 		return;
427 	}
428 
429 	window->current_line = vl;
430 	restore_cursor(window);
431 }
432 
433 static void
434 cmd_backward_char(struct window *window)
435 {
436 	if (window->cpoff != 0)
437 		window->cpoff--;
438 	restore_cursor(window);
439 }
440 
441 static void
442 cmd_forward_char(struct window *window)
443 {
444 	window->cpoff++;
445 	restore_cursor(window);
446 }
447 
448 static void
449 cmd_backward_paragraph(struct window *window)
450 {
451 	do {
452 		if (window->current_line == NULL ||
453 		    window->current_line == TAILQ_FIRST(&window->head)) {
454 			message("No previous paragraph");
455 			return;
456 		}
457 		cmd_previous_line(window);
458 	} while (window->current_line->line != NULL ||
459 	    window->current_line->parent->type != LINE_TEXT);
460 }
461 
462 static void
463 cmd_forward_paragraph(struct window *window)
464 {
465 	do {
466 		if (window->current_line == NULL ||
467 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
468 			message("No next paragraph");
469 			return;
470 		}
471 		cmd_next_line(window);
472 	} while (window->current_line->line != NULL ||
473 	    window->current_line->parent->type != LINE_TEXT);
474 }
475 
476 static void
477 cmd_move_beginning_of_line(struct window *window)
478 {
479 	window->cpoff = 0;
480 	restore_cursor(window);
481 }
482 
483 static void
484 cmd_move_end_of_line(struct window *window)
485 {
486 	struct vline	*vl;
487 
488 	vl = window->current_line;
489 	if (vl->line == NULL)
490 		return;
491 	window->cpoff = utf8_cplen(vl->line);
492 	restore_cursor(window);
493 }
494 
495 static void
496 cmd_redraw(struct window *window)
497 {
498 	handle_resize(0, 0, NULL);
499 }
500 
501 static void
502 cmd_scroll_line_up(struct window *window)
503 {
504 	struct vline	*vl;
505 
506 	if (window->line_off == 0)
507 		return;
508 
509 	vl = nth_line(window, --window->line_off);
510 	wscrl(body, -1);
511 	wmove(body, 0, 0);
512 	print_vline(body, vl);
513 
514 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
515 	restore_cursor(window);
516 }
517 
518 static void
519 cmd_scroll_line_down(struct window *window)
520 {
521 	struct vline	*vl;
522 
523 	vl = window->current_line;
524 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
525 		return;
526 	window->current_line = vl;
527 
528 	window->line_off++;
529 	wscrl(body, 1);
530 
531 	if (window->line_max - window->line_off < (size_t)body_lines)
532 		return;
533 
534 	vl = nth_line(window, window->line_off + body_lines-1);
535 	wmove(body, body_lines-1, 0);
536 	print_vline(body, vl);
537 
538 	restore_cursor(window);
539 }
540 
541 static void
542 cmd_scroll_up(struct window *window)
543 {
544 	size_t off;
545 
546 	off = body_lines+1;
547 
548 	for (; off > 0; --off)
549 		cmd_scroll_line_up(window);
550 }
551 
552 static void
553 cmd_scroll_down(struct window *window)
554 {
555 	size_t off;
556 
557 	off = body_lines+1;
558 
559 	for (; off > 0; --off)
560 		cmd_scroll_line_down(window);
561 }
562 
563 static void
564 cmd_beginning_of_buffer(struct window *window)
565 {
566 	window->current_line = TAILQ_FIRST(&window->head);
567 	window->line_off = 0;
568 	window->curs_y = 0;
569 	window->cpoff = 0;
570 	restore_cursor(window);
571 }
572 
573 static void
574 cmd_end_of_buffer(struct window *window)
575 {
576 	ssize_t off;
577 
578 	off = window->line_max - body_lines;
579 	off = MAX(0, off);
580 
581 	window->line_off = off;
582 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
583 
584 	window->current_line = TAILQ_LAST(&window->head, vhead);
585 	window->cpoff = body_cols;
586 	restore_cursor(window);
587 }
588 
589 static void
590 cmd_kill_telescope(struct window *window)
591 {
592 	event_loopbreak();
593 }
594 
595 static void
596 cmd_push_button(struct window *window)
597 {
598 	struct vline	*vl;
599 	size_t		 nth;
600 
601 	nth = window->line_off + window->curs_y;
602 	if (nth >= window->line_max)
603 		return;
604 	vl = nth_line(window, nth);
605 	if (vl->parent->type != LINE_LINK)
606 		return;
607 
608 	load_url_in_tab(current_tab(), vl->parent->alt);
609 }
610 
611 static void
612 cmd_push_button_new_tab(struct window *window)
613 {
614 	struct vline	*vl;
615 	size_t		 nth;
616 
617 	nth = window->line_off + window->curs_y;
618 	if (nth > window->line_max)
619 		return;
620 	vl = nth_line(window, nth);
621 	if (vl->parent->type != LINE_LINK)
622 		return;
623 
624 	new_tab(vl->parent->alt);
625 }
626 
627 static void
628 cmd_previous_button(struct window *window)
629 {
630 	do {
631 		if (window->current_line == NULL ||
632 		    window->current_line == TAILQ_FIRST(&window->head)) {
633 			message("No previous link");
634 			return;
635 		}
636 		cmd_previous_line(window);
637 	} while (window->current_line->parent->type != LINE_LINK);
638 }
639 
640 static void
641 cmd_next_button(struct window *window)
642 {
643 	do {
644 		if (window->current_line == NULL ||
645 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
646 			message("No next link");
647 			return;
648 		}
649 		cmd_next_line(window);
650 	} while (window->current_line->parent->type != LINE_LINK);
651 }
652 
653 static void
654 cmd_previous_page(struct window *window)
655 {
656 	struct tab *tab = current_tab();
657 
658 	if (!load_previous_page(tab))
659 		message("No previous page");
660 	else
661 		start_loading_anim(tab);
662 }
663 
664 static void
665 cmd_next_page(struct window *window)
666 {
667 	struct tab *tab = current_tab();
668 
669 	if (!load_next_page(tab))
670 		message("No next page");
671 	else
672 		start_loading_anim(tab);
673 }
674 
675 static void
676 cmd_clear_minibuf(struct window *window)
677 {
678 	handle_clear_minibuf(0, 0, NULL);
679 }
680 
681 static void
682 cmd_execute_extended_command(struct window *window)
683 {
684 	size_t	 len;
685 
686 	if (in_minibuffer) {
687 		message("We don't have enable-recursive-minibuffers");
688 		return;
689 	}
690 
691 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
692 	    &eecmd_history);
693 
694 	len = sizeof(ministate.prompt);
695 	strlcpy(ministate.prompt, "", len);
696 
697 	if (thiskey.meta)
698 		strlcat(ministate.prompt, "M-", len);
699 
700 	strlcat(ministate.prompt, keyname(thiskey.key), len);
701 	strlcat(ministate.prompt, " ", len);
702 }
703 
704 static void
705 cmd_tab_close(struct window *window)
706 {
707 	struct tab *tab, *t;
708 
709 	tab = current_tab();
710 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
711 	    TAILQ_NEXT(tab, tabs) == NULL) {
712 		message("Can't close the only tab.");
713 		return;
714 	}
715 
716 	if (evtimer_pending(&tab->loadingev, NULL))
717 		evtimer_del(&tab->loadingev);
718 
719 	stop_tab(tab);
720 
721 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
722 		t = TAILQ_NEXT(tab, tabs);
723 	TAILQ_REMOVE(&tabshead, tab, tabs);
724 	free(tab);
725 
726 	switch_to_tab(t);
727 }
728 
729 static void
730 cmd_tab_close_other(struct window *window)
731 {
732 	struct tab *t, *i;
733 
734 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
735 		if (t->flags & TAB_CURRENT)
736 			continue;
737 
738 		stop_tab(t);
739 		TAILQ_REMOVE(&tabshead, t, tabs);
740 		free(t);
741 	}
742 }
743 
744 static void
745 cmd_tab_new(struct window *window)
746 {
747 	new_tab(NEW_TAB_URL);
748 }
749 
750 static void
751 cmd_tab_next(struct window *window)
752 {
753 	struct tab *tab, *t;
754 
755 	tab = current_tab();
756 	tab->flags &= ~TAB_CURRENT;
757 
758 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
759 		t = TAILQ_FIRST(&tabshead);
760 	t->flags |= TAB_CURRENT;
761 }
762 
763 static void
764 cmd_tab_previous(struct window *window)
765 {
766 	struct tab *tab, *t;
767 
768 	tab = current_tab();
769 	tab->flags &= ~TAB_CURRENT;
770 
771 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
772 		t = TAILQ_LAST(&tabshead, tabshead);
773 	t->flags |= TAB_CURRENT;
774 }
775 
776 static void
777 cmd_tab_move(struct window *window)
778 {
779 	struct tab *tab, *t;
780 
781 	tab = current_tab();
782 	t = TAILQ_NEXT(tab, tabs);
783 	TAILQ_REMOVE(&tabshead, tab, tabs);
784 
785 	if (t == NULL)
786 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
787 	else
788 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
789 }
790 
791 static void
792 cmd_tab_move_to(struct window *window)
793 {
794 	struct tab *tab, *t;
795 
796 	tab = current_tab();
797 	t = TAILQ_PREV(tab, tabshead, tabs);
798 	TAILQ_REMOVE(&tabshead, tab, tabs);
799 
800 	if (t == NULL) {
801 		if (TAILQ_EMPTY(&tabshead))
802 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
803 		else
804 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
805 	} else
806 		TAILQ_INSERT_BEFORE(t, tab, tabs);
807 }
808 
809 static void
810 cmd_load_url(struct window *window)
811 {
812 	if (in_minibuffer) {
813 		message("We don't have enable-recursive-minibuffers");
814 		return;
815 	}
816 
817 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
818 	    &lu_history);
819 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
820 }
821 
822 static void
823 cmd_load_current_url(struct window *window)
824 {
825 	struct tab *tab = current_tab();
826 
827 	if (in_minibuffer) {
828 		message("We don't have enable-recursive-minibuffers");
829 		return;
830 	}
831 
832 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
833 	    &lu_history);
834 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
835 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
836 	ministate.window.cpoff = utf8_cplen(ministate.buf);
837 }
838 
839 static void
840 cmd_bookmark_page(struct window *window)
841 {
842 	struct tab *tab = current_tab();
843 
844 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
845 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
846 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
847 	ministate.window.cpoff = utf8_cplen(ministate.buf);
848 }
849 
850 static void
851 cmd_goto_bookmarks(struct window *window)
852 {
853 	load_url_in_tab(current_tab(), "about:bookmarks");
854 }
855 
856 static void
857 cmd_toggle_help(struct window *window)
858 {
859 	side_window = !side_window;
860 	if (side_window)
861 		recompute_help();
862 
863 	/* ugly hack, but otherwise the window doesn't get updated
864 	 * until I call handle_resize a second time (i.e. C-l).  I
865 	 * will be happy to know why something like this is needed. */
866 	handle_resize(0, 0, NULL);
867 	handle_resize(0, 0, NULL);
868 }
869 
870 static void
871 cmd_mini_delete_char(struct window *window)
872 {
873 	char *c, *n;
874 
875 	if (!in_minibuffer) {
876 		message("text is read-only");
877 		return;
878 	}
879 
880 	minibuffer_taint_hist();
881 
882 	c = utf8_nth(window->current_line->line, window->cpoff);
883 	if (*c == '\0')
884 		return;
885 	n = utf8_next_cp(c);
886 
887 	memmove(c, n, strlen(n)+1);
888 }
889 
890 static void
891 cmd_mini_delete_backward_char(struct window *window)
892 {
893 	char *c, *p, *start;
894 
895 	if (!in_minibuffer) {
896 		message("text is read-only");
897 		return;
898 	}
899 
900 	minibuffer_taint_hist();
901 
902 	c = utf8_nth(window->current_line->line, window->cpoff);
903 	start = window->current_line->line;
904 	if (c == start)
905 		return;
906 	p = utf8_prev_cp(c-1, start);
907 
908 	memmove(p, c, strlen(c)+1);
909 	window->cpoff--;
910 }
911 
912 static void
913 cmd_mini_kill_line(struct window *window)
914 {
915 	char *c;
916 
917 	if (!in_minibuffer) {
918 		message("text is read-only");
919 		return;
920 	}
921 
922 	minibuffer_taint_hist();
923 	c = utf8_nth(window->current_line->line, window->cpoff);
924 	*c = '\0';
925 }
926 
927 static void
928 cmd_mini_abort(struct window *window)
929 {
930 	if (!in_minibuffer)
931 		return;
932 
933 	ministate.abortfn();
934 }
935 
936 static void
937 cmd_mini_complete_and_exit(struct window *window)
938 {
939 	if (!in_minibuffer)
940 		return;
941 
942 	minibuffer_taint_hist();
943 	ministate.donefn();
944 }
945 
946 static void
947 cmd_mini_previous_history_element(struct window *window)
948 {
949 	if (ministate.history == NULL) {
950 		message("No history");
951 		return;
952 	}
953 
954 	if (ministate.hist_cur == NULL ||
955 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
956 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
957 		ministate.hist_off = ministate.history->len - 1;
958 		if (ministate.hist_cur == NULL)
959 			message("No prev item");
960 	} else {
961 		ministate.hist_off--;
962 	}
963 
964 	if (ministate.hist_cur != NULL)
965 		window->current_line->line = ministate.hist_cur->h;
966 }
967 
968 static void
969 cmd_mini_next_history_element(struct window *window)
970 {
971 	if (ministate.history == NULL) {
972 		message("No history");
973 		return;
974 	}
975 
976 	if (ministate.hist_cur == NULL ||
977 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
978 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
979 		ministate.hist_off = 0;
980 		if (ministate.hist_cur == NULL)
981 			message("No next item");
982 	} else {
983 		ministate.hist_off++;
984 	}
985 
986 	if (ministate.hist_cur != NULL)
987 		window->current_line->line = ministate.hist_cur->h;
988 }
989 
990 static void
991 global_key_unbound(void)
992 {
993 	message("%s is undefined", keybuf);
994 }
995 
996 static void
997 minibuffer_hist_save_entry(void)
998 {
999 	struct hist	*hist;
1000 
1001 	if (ministate.history == NULL)
1002 		return;
1003 
1004 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1005 		abort();
1006 
1007 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1008 
1009 	if (TAILQ_EMPTY(&ministate.history->head))
1010 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1011 	else
1012 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1013 	ministate.history->len++;
1014 }
1015 
1016 /*
1017  * taint the minibuffer cache: if we're currently showing a history
1018  * element, copy that to the current buf and reset the "history
1019  * navigation" thing.
1020  */
1021 static void
1022 minibuffer_taint_hist(void)
1023 {
1024 	if (ministate.hist_cur == NULL)
1025 		return;
1026 
1027 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1028 	ministate.hist_cur = NULL;
1029 }
1030 
1031 static void
1032 minibuffer_self_insert(void)
1033 {
1034 	char	*c, tmp[5] = {0};
1035 	size_t	len;
1036 
1037 	minibuffer_taint_hist();
1038 
1039 	if (thiskey.cp == 0)
1040 		return;
1041 
1042 	len = utf8_encode(thiskey.cp, tmp);
1043 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1044 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1045 		return;
1046 
1047 	memmove(c + len, c, strlen(c)+1);
1048 	memcpy(c, tmp, len);
1049 	ministate.window.cpoff++;
1050 }
1051 
1052 static void
1053 eecmd_self_insert(void)
1054 {
1055 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1056 	    !unicode_isgraph(thiskey.cp)) {
1057 		global_key_unbound();
1058 		return;
1059 	}
1060 
1061 	minibuffer_self_insert();
1062 }
1063 
1064 static void
1065 eecmd_select(void)
1066 {
1067 	struct cmds *cmd;
1068 
1069 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1070 		if (!strcmp(cmd->cmd, ministate.buf)) {
1071 			exit_minibuffer();
1072 			minibuffer_hist_save_entry();
1073 			cmd->fn(current_window());
1074 			return;
1075 		}
1076 	}
1077 
1078 	message("No match");
1079 }
1080 
1081 static void
1082 ir_self_insert(void)
1083 {
1084 	minibuffer_self_insert();
1085 }
1086 
1087 static void
1088 ir_select(void)
1089 {
1090 	char		 buf[1025] = {0};
1091 	struct url	 url;
1092 	struct tab	*tab;
1093 
1094 	tab = current_tab();
1095 
1096 	exit_minibuffer();
1097 	minibuffer_hist_save_entry();
1098 
1099 	/* a bit ugly but... */
1100 	memcpy(&url, &tab->url, sizeof(tab->url));
1101 	url_set_query(&url, ministate.buf);
1102 	url_unparse(&url, buf, sizeof(buf));
1103 	load_url_in_tab(tab, buf);
1104 }
1105 
1106 static void
1107 lu_self_insert(void)
1108 {
1109 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1110 	    !unicode_isgraph(thiskey.key)) {
1111 		global_key_unbound();
1112 		return;
1113 	}
1114 
1115 	minibuffer_self_insert();
1116 }
1117 
1118 static void
1119 lu_select(void)
1120 {
1121 	exit_minibuffer();
1122 	minibuffer_hist_save_entry();
1123 	load_url_in_tab(current_tab(), ministate.buf);
1124 }
1125 
1126 static void
1127 bp_select(void)
1128 {
1129 	exit_minibuffer();
1130 	if (*ministate.buf != '\0')
1131 		add_to_bookmarks(ministate.buf);
1132 	else
1133 		message("Abort.");
1134 }
1135 
1136 static void
1137 yornp_self_insert(void)
1138 {
1139 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1140 		message("Please answer y or n");
1141 		return;
1142 	}
1143 
1144 	yornp_cb(thiskey.key == 'y', current_tab()->id);
1145 	exit_minibuffer();
1146 }
1147 
1148 static void
1149 yornp_abort(void)
1150 {
1151 	yornp_cb(0, current_tab()->id);
1152 	exit_minibuffer();
1153 }
1154 
1155 static struct vline *
1156 nth_line(struct window *window, size_t n)
1157 {
1158 	struct vline	*vl;
1159 	size_t		 i;
1160 
1161 	i = 0;
1162 	TAILQ_FOREACH(vl, &window->head, vlines) {
1163 		if (i == n)
1164 			return vl;
1165 		i++;
1166 	}
1167 
1168 	/* unreachable */
1169 	abort();
1170 }
1171 
1172 static struct tab *
1173 current_tab(void)
1174 {
1175 	struct tab *t;
1176 
1177 	TAILQ_FOREACH(t, &tabshead, tabs) {
1178 		if (t->flags & TAB_CURRENT)
1179 			return t;
1180 	}
1181 
1182 	/* unreachable */
1183 	abort();
1184 }
1185 
1186 static struct window *
1187 current_window(void)
1188 {
1189 	if (in_minibuffer)
1190 		return &ministate.window;
1191 	return &current_tab()->window;
1192 }
1193 
1194 static int
1195 readkey(void)
1196 {
1197 	uint32_t state = 0;
1198 
1199 	if ((thiskey.key = wgetch(body)) == ERR)
1200 		return 0;
1201 
1202 	thiskey.meta = thiskey.key == 27;
1203 	if (thiskey.meta) {
1204 		thiskey.key = wgetch(body);
1205 		if (thiskey.key == ERR || thiskey.key == 27) {
1206 			thiskey.meta = 0;
1207 			thiskey.key = 27;
1208 		}
1209 	}
1210 
1211 	thiskey.cp = 0;
1212 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1213 		while (1) {
1214 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1215 				break;
1216 			if ((thiskey.key = wgetch(body)) == ERR) {
1217 				message("Error decoding user input");
1218 				return 0;
1219 			}
1220 		}
1221 	}
1222 
1223 	return 1;
1224 }
1225 
1226 static void
1227 dispatch_stdio(int fd, short ev, void *d)
1228 {
1229 	struct keymap	*k;
1230 	const char	*keyname;
1231 	char		 tmp[5] = {0};
1232 
1233 	if (!readkey())
1234 		return;
1235 
1236 	if (keybuf[0] != '\0')
1237 		strlcat(keybuf, " ", sizeof(keybuf));
1238 	if (thiskey.meta)
1239 		strlcat(keybuf, "M-", sizeof(keybuf));
1240 	if (thiskey.cp != 0) {
1241 		utf8_encode(thiskey.cp, tmp);
1242 		strlcat(keybuf, tmp, sizeof(keybuf));
1243 	} else {
1244 		if ((keyname = unkbd(thiskey.key)) != NULL)
1245 			strlcat(keybuf, keyname, sizeof(keybuf));
1246 		else {
1247 			tmp[0] = thiskey.key;
1248 			strlcat(keybuf, tmp, sizeof(keybuf));
1249 		}
1250 	}
1251 
1252 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1253 		if (k->meta == thiskey.meta &&
1254 		    k->key == thiskey.key) {
1255 			if (k->fn == NULL)
1256 				current_map = &k->map;
1257 			else {
1258 				current_map = base_map;
1259 				strlcpy(keybuf, "", sizeof(keybuf));
1260 				k->fn(current_window());
1261 			}
1262 			goto done;
1263 		}
1264 	}
1265 
1266 	if (current_map->unhandled_input != NULL)
1267 		current_map->unhandled_input();
1268 	else {
1269 		global_key_unbound();
1270 	}
1271 
1272 	strlcpy(keybuf, "", sizeof(keybuf));
1273 	current_map = base_map;
1274 
1275 done:
1276 	if (side_window)
1277 		recompute_help();
1278 
1279 	redraw_tab(current_tab());
1280 }
1281 
1282 static void
1283 handle_clear_minibuf(int fd, short ev, void *d)
1284 {
1285 	free(ministate.curmesg);
1286 	ministate.curmesg = NULL;
1287 
1288 	redraw_minibuffer();
1289 	if (in_minibuffer) {
1290 		wrefresh(body);
1291 		wrefresh(minibuf);
1292 	} else {
1293 		wrefresh(minibuf);
1294 		wrefresh(body);
1295 	}
1296 }
1297 
1298 static void
1299 handle_resize(int sig, short ev, void *d)
1300 {
1301 	struct tab	*tab;
1302 
1303 	endwin();
1304 	refresh();
1305 	clear();
1306 
1307 	/* move and resize the windows, in reverse order! */
1308 
1309 	mvwin(minibuf, LINES-1, 0);
1310 	wresize(minibuf, 1, COLS);
1311 
1312 	mvwin(modeline, LINES-2, 0);
1313 	wresize(modeline, 1, COLS);
1314 
1315 	body_lines = LINES-3;
1316 	body_cols = COLS;
1317 
1318 	if (side_window) {
1319 		help_cols = 0.3 * COLS;
1320 		help_lines = LINES-3;
1321 		mvwin(help, 1, 0);
1322 		wresize(help, help_lines, help_cols);
1323 
1324 		wrap_page(&helpwin, help_cols);
1325 
1326 		body_cols = COLS - help_cols - 1;
1327 		mvwin(body, 1, help_cols);
1328 	} else
1329 		mvwin(body, 1, 0);
1330 
1331 	wresize(body, body_lines, body_cols);
1332 
1333 	wresize(tabline, 1, COLS);
1334 
1335 	tab = current_tab();
1336 
1337 	wrap_page(&tab->window, body_cols);
1338 	redraw_tab(tab);
1339 }
1340 
1341 static int
1342 wrap_page(struct window *window, int width)
1343 {
1344 	struct line		*l;
1345 	const struct line	*orig;
1346 	struct vline		*vl;
1347 	const char		*prfx;
1348 
1349 	orig = window->current_line == NULL
1350 		? NULL
1351 		: window->current_line->parent;
1352 	window->current_line = NULL;
1353 
1354 	window->curs_y = 0;
1355 	window->line_off = 0;
1356 
1357 	empty_vlist(window);
1358 
1359 	TAILQ_FOREACH(l, &window->page.head, lines) {
1360 		prfx = line_prefixes[l->type].prfx1;
1361 		switch (l->type) {
1362 		case LINE_TEXT:
1363 		case LINE_LINK:
1364 		case LINE_TITLE_1:
1365 		case LINE_TITLE_2:
1366 		case LINE_TITLE_3:
1367 		case LINE_ITEM:
1368 		case LINE_QUOTE:
1369 		case LINE_PRE_START:
1370 		case LINE_PRE_END:
1371 			wrap_text(window, prfx, l, width);
1372 			break;
1373 		case LINE_PRE_CONTENT:
1374                         hardwrap_text(window, l, width);
1375 			break;
1376 		}
1377 
1378 		if (orig == l && window->current_line == NULL) {
1379 			window->line_off = window->line_max-1;
1380 			window->current_line = TAILQ_LAST(&window->head, vhead);
1381 
1382 			while (1) {
1383 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1384 				if (vl == NULL || vl->parent != orig)
1385 					break;
1386 				window->current_line = vl;
1387 				window->line_off--;
1388 			}
1389 		}
1390 	}
1391 
1392         if (window->current_line == NULL)
1393 		window->current_line = TAILQ_FIRST(&window->head);
1394 
1395 	return 1;
1396 }
1397 
1398 static void
1399 print_vline(WINDOW *window, struct vline *vl)
1400 {
1401 	const char *text = vl->line;
1402 	const char *prfx;
1403 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1404 	int text_face = line_faces[vl->parent->type].text_prop;
1405 
1406 	if (!vl->flags)
1407 		prfx = line_prefixes[vl->parent->type].prfx1;
1408 	else
1409 		prfx = line_prefixes[vl->parent->type].prfx2;
1410 
1411 	if (text == NULL)
1412 		text = "";
1413 
1414 	wattron(window, prefix_face);
1415 	wprintw(window, "%s", prfx);
1416 	wattroff(window, prefix_face);
1417 
1418 	wattron(window, text_face);
1419 	wprintw(window, "%s", text);
1420 	wattroff(window, text_face);
1421 }
1422 
1423 static void
1424 redraw_tabline(void)
1425 {
1426 	struct tab	*tab;
1427 	size_t		 toskip;
1428 	int		 current, x, y, truncated;
1429 	const char	*title;
1430 	char		 buf[25];
1431 
1432 	toskip = 0;
1433 	x = 1;
1434 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1435 		x += sizeof(buf) + 1;
1436 		toskip++;
1437 		if (tab->flags & TAB_CURRENT)
1438 			break;
1439 	}
1440 	if (x < COLS-2)
1441 		toskip = 0;
1442 	else
1443 		toskip--;
1444 
1445 	werase(tabline);
1446 	wattron(tabline, tab_face.background);
1447 	wprintw(tabline, toskip == 0 ? " " : "<");
1448 	wattroff(tabline, tab_face.background);
1449 
1450 	truncated = 0;
1451 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1452 		if (truncated)
1453 			break;
1454 		if (toskip != 0) {
1455 			toskip--;
1456 			continue;
1457 		}
1458 
1459 		getyx(tabline, y, x);
1460 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1461 			truncated = 1;
1462 
1463 		current = tab->flags & TAB_CURRENT;
1464 
1465 		if (*(title = tab->window.page.title) == '\0')
1466 			title = tab->hist_cur->h;
1467 
1468 		strlcpy(buf, " ", sizeof(buf));
1469                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1470 			/* truncation happens */
1471 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1472 		} else {
1473 			/* pad with spaces */
1474 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1475 				/* nop */ ;
1476 		}
1477 
1478 		if (current)
1479 			wattron(tabline, tab_face.current_tab);
1480 		else
1481 			wattron(tabline, tab_face.tab);
1482 
1483 		wprintw(tabline, "%s", buf);
1484 		if (TAILQ_NEXT(tab, tabs) != NULL)
1485 			wprintw(tabline, " ");
1486 
1487 		if (current)
1488 			wattroff(tabline, tab_face.current_tab);
1489 		else
1490 			wattroff(tabline, tab_face.tab);
1491 	}
1492 
1493 	wattron(tabline, tab_face.background);
1494 	for (; x < COLS; ++x)
1495 		waddch(tabline, ' ');
1496 	if (truncated)
1497 		mvwprintw(tabline, 0, COLS-1, ">");
1498 }
1499 
1500 static void
1501 redraw_window(WINDOW *win, int height, struct window *window)
1502 {
1503 	struct vline	*vl;
1504 	int		 l;
1505 
1506 	werase(win);
1507 
1508 	window->line_off = MIN(window->line_max-1, window->line_off);
1509 	if (TAILQ_EMPTY(&window->head))
1510 		return;
1511 
1512 	l = 0;
1513 	vl = nth_line(window, window->line_off);
1514 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1515 		wmove(win, l, 0);
1516 		print_vline(win, vl);
1517 		l++;
1518 		if (l == height)
1519 			break;
1520 	}
1521 
1522 	wmove(win, window->curs_y, window->curs_x);
1523 }
1524 
1525 static void
1526 redraw_help(void)
1527 {
1528 	redraw_window(help, help_lines, &helpwin);
1529 }
1530 
1531 static void
1532 redraw_body(struct tab *tab)
1533 {
1534 	redraw_window(body, body_lines, &tab->window);
1535 }
1536 
1537 static inline char
1538 trust_status_char(enum trust_state ts)
1539 {
1540 	switch (ts) {
1541 	case TS_UNKNOWN:	return 'u';
1542 	case TS_UNTRUSTED:	return '!';
1543 	case TS_TRUSTED:	return 'v';
1544 	case TS_VERIFIED:	return 'V';
1545 	}
1546 }
1547 
1548 static void
1549 redraw_modeline(struct tab *tab)
1550 {
1551 	double		 pct;
1552 	int		 x, y, max_x, max_y;
1553 	const char	*mode = tab->window.page.name;
1554 	const char	*spin = "-\\|/";
1555 
1556 	werase(modeline);
1557 	wattron(modeline, A_REVERSE);
1558 	wmove(modeline, 0, 0);
1559 
1560 	wprintw(modeline, "-%c%c %s ",
1561 	    spin[tab->loading_anim_step],
1562 	    trust_status_char(tab->trust),
1563 	    mode == NULL ? "(none)" : mode);
1564 
1565 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1566 
1567 	if (tab->window.line_max <= (size_t)body_lines)
1568                 wprintw(modeline, "All ");
1569 	else if (tab->window.line_off == 0)
1570                 wprintw(modeline, "Top ");
1571 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1572 		wprintw(modeline, "Bottom ");
1573 	else
1574 		wprintw(modeline, "%.0f%% ", pct);
1575 
1576 	wprintw(modeline, "%d/%d %s ",
1577 	    tab->window.line_off + tab->window.curs_y,
1578 	    tab->window.line_max,
1579 	    tab->hist_cur->h);
1580 
1581 	getyx(modeline, y, x);
1582 	getmaxyx(modeline, max_y, max_x);
1583 
1584 	(void)y;
1585 	(void)max_y;
1586 
1587 	for (; x < max_x; ++x)
1588 		waddstr(modeline, "-");
1589 }
1590 
1591 static void
1592 redraw_minibuffer(void)
1593 {
1594 	struct tab *tab;
1595 	size_t off_y, off_x = 0;
1596 	char *start, *c;
1597 
1598 	werase(minibuf);
1599 
1600 	if (in_minibuffer) {
1601 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1602 		if (ministate.hist_cur != NULL)
1603 			wprintw(minibuf, "(%zu/%zu) ",
1604 			    ministate.hist_off + 1,
1605 			    ministate.history->len);
1606 
1607 		getyx(minibuf, off_y, off_x);
1608 
1609 		start = ministate.hist_cur != NULL
1610 			? ministate.hist_cur->h
1611 			: ministate.buf;
1612 		c = utf8_nth(ministate.window.current_line->line,
1613 		    ministate.window.cpoff);
1614 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1615 			start = utf8_next_cp(start);
1616 		}
1617 
1618 		waddstr(minibuf, start);
1619 	}
1620 
1621 	if (ministate.curmesg != NULL)
1622                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1623 		    ministate.curmesg);
1624 
1625 	if (!in_minibuffer && ministate.curmesg == NULL)
1626 		waddstr(minibuf, keybuf);
1627 
1628 	/* If nothing else, show the URL at point */
1629 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1630 		tab = current_tab();
1631 		if (tab->window.current_line != NULL &&
1632 		    tab->window.current_line->parent->type == LINE_LINK)
1633 			waddstr(minibuf, tab->window.current_line->parent->alt);
1634 	}
1635 
1636 	if (in_minibuffer)
1637 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1638 }
1639 
1640 static void
1641 redraw_tab(struct tab *tab)
1642 {
1643 	if (side_window) {
1644 		redraw_help();
1645 		wnoutrefresh(help);
1646 	}
1647 
1648 	redraw_tabline();
1649 	redraw_body(tab);
1650 	redraw_modeline(tab);
1651 	redraw_minibuffer();
1652 
1653 	wnoutrefresh(tabline);
1654 	wnoutrefresh(modeline);
1655 
1656 	if (in_minibuffer) {
1657 		wnoutrefresh(body);
1658 		wnoutrefresh(minibuf);
1659 	} else {
1660 		wnoutrefresh(minibuf);
1661 		wnoutrefresh(body);
1662 	}
1663 
1664 	doupdate();
1665 }
1666 
1667 static void
1668 emit_help_item(char *prfx, void *fn)
1669 {
1670 	struct line	*l;
1671 	struct cmds	*cmd;
1672 
1673 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1674 		if (fn == cmd->fn)
1675 			break;
1676 	}
1677 	assert(cmd != NULL);
1678 
1679 	if ((l = calloc(1, sizeof(*l))) == NULL)
1680 		abort();
1681 
1682 	l->type = LINE_TEXT;
1683 	l->alt = NULL;
1684 
1685 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1686 
1687 	if (TAILQ_EMPTY(&helpwin.page.head))
1688 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1689 	else
1690 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1691 }
1692 
1693 static void
1694 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1695 {
1696 	struct keymap	*k;
1697 	char		 p[32];
1698 	const char	*kn;
1699 
1700 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1701 		strlcpy(p, prfx, sizeof(p));
1702 		if (*p != '\0')
1703 			strlcat(p, " ", sizeof(p));
1704 		if (k->meta)
1705 			strlcat(p, "M-", sizeof(p));
1706 		if ((kn = unkbd(k->key)) != NULL)
1707 			strlcat(p, kn, sizeof(p));
1708 		else
1709 			strlcat(p, keyname(k->key), sizeof(p));
1710 
1711 		if (k->fn == NULL)
1712 			rec_compute_help(&k->map, p, sizeof(p));
1713 		else
1714 			emit_help_item(p, k->fn);
1715 	}
1716 }
1717 
1718 static void
1719 recompute_help(void)
1720 {
1721 	char	p[32] = { 0 };
1722 
1723 	empty_vlist(&helpwin);
1724 	empty_linelist(&helpwin);
1725 	rec_compute_help(current_map, p, sizeof(p));
1726 	wrap_page(&helpwin, help_cols);
1727 }
1728 
1729 static void
1730 vmessage(const char *fmt, va_list ap)
1731 {
1732 	if (evtimer_pending(&clminibufev, NULL))
1733 		evtimer_del(&clminibufev);
1734 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1735 	evtimer_add(&clminibufev, &clminibufev_timer);
1736 
1737 	free(ministate.curmesg);
1738 
1739 	/* TODO: what to do if the allocation fails here? */
1740 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1741 		ministate.curmesg = NULL;
1742 
1743 	redraw_minibuffer();
1744 	if (in_minibuffer) {
1745 		wrefresh(body);
1746 		wrefresh(minibuf);
1747 	} else {
1748 		wrefresh(minibuf);
1749 		wrefresh(body);
1750 	}
1751 }
1752 
1753 static void
1754 message(const char *fmt, ...)
1755 {
1756 	va_list ap;
1757 
1758 	va_start(ap, fmt);
1759 	vmessage(fmt, ap);
1760 	va_end(ap);
1761 }
1762 
1763 static void
1764 start_loading_anim(struct tab *tab)
1765 {
1766 	if (tab->loading_anim)
1767 		return;
1768 	tab->loading_anim = 1;
1769 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1770 	evtimer_add(&tab->loadingev, &loadingev_timer);
1771 }
1772 
1773 static void
1774 update_loading_anim(int fd, short ev, void *d)
1775 {
1776 	struct tab	*tab = d;
1777 
1778 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1779 
1780 	if (tab->flags & TAB_CURRENT) {
1781 		redraw_modeline(tab);
1782 		wrefresh(modeline);
1783 		wrefresh(body);
1784 		if (in_minibuffer)
1785 			wrefresh(minibuf);
1786 	}
1787 
1788 	evtimer_add(&tab->loadingev, &loadingev_timer);
1789 }
1790 
1791 static void
1792 stop_loading_anim(struct tab *tab)
1793 {
1794 	if (!tab->loading_anim)
1795 		return;
1796 	evtimer_del(&tab->loadingev);
1797 	tab->loading_anim = 0;
1798 	tab->loading_anim_step = 0;
1799 
1800 	if (!(tab->flags & TAB_CURRENT))
1801 		return;
1802 
1803 	redraw_modeline(tab);
1804 
1805 	wrefresh(modeline);
1806 	wrefresh(body);
1807 	if (in_minibuffer)
1808 		wrefresh(minibuf);
1809 }
1810 
1811 static void
1812 load_url_in_tab(struct tab *tab, const char *url)
1813 {
1814 	empty_vlist(&tab->window);
1815 	message("Loading %s...", url);
1816 	start_loading_anim(tab);
1817 	load_url(tab, url);
1818 
1819 	tab->window.curs_x = 0;
1820 	tab->window.curs_y = 0;
1821 	redraw_tab(tab);
1822 }
1823 
1824 static void
1825 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1826     void (*abortfn)(void), struct histhead *hist)
1827 {
1828 	in_minibuffer = 1;
1829 	base_map = &minibuffer_map;
1830 	current_map = &minibuffer_map;
1831 
1832 	base_map->unhandled_input = self_insert_fn;
1833 
1834 	ministate.donefn = donefn;
1835 	ministate.abortfn = abortfn;
1836 	memset(ministate.buf, 0, sizeof(ministate.buf));
1837 	ministate.window.current_line = &ministate.vline;
1838 	ministate.window.current_line->line = ministate.buf;
1839 	ministate.window.cpoff = 0;
1840 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1841 
1842 	ministate.history = hist;
1843 	ministate.hist_cur = NULL;
1844 	ministate.hist_off = 0;
1845 }
1846 
1847 static void
1848 exit_minibuffer(void)
1849 {
1850 	werase(minibuf);
1851 
1852 	in_minibuffer = 0;
1853 	base_map = &global_map;
1854 	current_map = &global_map;
1855 }
1856 
1857 static void
1858 switch_to_tab(struct tab *tab)
1859 {
1860 	struct tab	*t;
1861 
1862 	TAILQ_FOREACH(t, &tabshead, tabs) {
1863 		t->flags &= ~TAB_CURRENT;
1864 	}
1865 
1866 	tab->flags |= TAB_CURRENT;
1867 }
1868 
1869 static struct tab *
1870 new_tab(const char *url)
1871 {
1872 	struct tab	*tab;
1873 
1874 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1875 		event_loopbreak();
1876 		return NULL;
1877 	}
1878 
1879 	TAILQ_INIT(&tab->hist.head);
1880 
1881 	TAILQ_INIT(&tab->window.head);
1882 
1883 	tab->id = tab_counter++;
1884 	switch_to_tab(tab);
1885 
1886 	if (TAILQ_EMPTY(&tabshead))
1887 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1888 	else
1889 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1890 
1891 	load_url_in_tab(tab, url);
1892 	return tab;
1893 }
1894 
1895 static void
1896 usage(void)
1897 {
1898 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1899 }
1900 
1901 int
1902 ui_init(int argc, char * const *argv)
1903 {
1904 	const char *url = NEW_TAB_URL;
1905 	int ch;
1906 
1907 	while ((ch = getopt(argc, argv, "")) != -1) {
1908 		switch (ch) {
1909 		default:
1910 			usage();
1911 			return 0;
1912 		}
1913 	}
1914 	argc -= optind;
1915 	argv += optind;
1916 
1917 	if (argc != 0)
1918 		url = argv[0];
1919 
1920 	setlocale(LC_ALL, "");
1921 
1922 	TAILQ_INIT(&global_map.m);
1923 	global_map.unhandled_input = global_key_unbound;
1924 
1925 	TAILQ_INIT(&minibuffer_map.m);
1926 
1927 	TAILQ_INIT(&eecmd_history.head);
1928 	TAILQ_INIT(&ir_history.head);
1929 	TAILQ_INIT(&lu_history.head);
1930 
1931 	ministate.line.type = LINE_TEXT;
1932 	ministate.vline.parent = &ministate.line;
1933 	ministate.window.current_line = &ministate.vline;
1934 
1935 	/* initialize help window */
1936 	TAILQ_INIT(&helpwin.head);
1937 
1938 	base_map = &global_map;
1939 	current_map = &global_map;
1940 	load_default_keys();
1941 
1942 	initscr();
1943 	raw();
1944 	noecho();
1945 
1946 	nonl();
1947 	intrflush(stdscr, FALSE);
1948 
1949 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1950 		return 0;
1951 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1952 		return 0;
1953 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1954 		return 0;
1955 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1956 		return 0;
1957 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1958 		return 0;
1959 
1960 	body_lines = LINES-3;
1961 	body_cols = COLS;
1962 
1963 	keypad(body, TRUE);
1964 	scrollok(body, TRUE);
1965 
1966 	/* non-blocking input */
1967 	wtimeout(body, 0);
1968 
1969 	mvwprintw(body, 0, 0, "");
1970 
1971 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1972 	event_add(&stdioev, NULL);
1973 
1974 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1975 	signal_add(&winchev, NULL);
1976 
1977 	new_tab(url);
1978 
1979 	return 1;
1980 }
1981 
1982 void
1983 ui_on_tab_loaded(struct tab *tab)
1984 {
1985 	stop_loading_anim(tab);
1986 	message("Loaded %s", tab->hist_cur->h);
1987 
1988 	redraw_tabline();
1989 	wrefresh(tabline);
1990 	if (in_minibuffer)
1991 		wrefresh(minibuf);
1992 	else
1993 		wrefresh(body);
1994 }
1995 
1996 void
1997 ui_on_tab_refresh(struct tab *tab)
1998 {
1999 	wrap_page(&tab->window, body_cols);
2000 	if (tab->flags & TAB_CURRENT) {
2001 		restore_cursor(&tab->window);
2002 		redraw_tab(tab);
2003 	}
2004 }
2005 
2006 void
2007 ui_require_input(struct tab *tab, int hide)
2008 {
2009 	/* TODO: hard-switching to another tab is ugly */
2010 	switch_to_tab(tab);
2011 
2012 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2013 	    &ir_history);
2014 	strlcpy(ministate.prompt, "Input required: ",
2015 	    sizeof(ministate.prompt));
2016 	redraw_tab(tab);
2017 }
2018 
2019 void
2020 ui_yornp(const char *prompt, void (*fn)(int, unsigned int))
2021 {
2022 	size_t len;
2023 
2024 	yornp_cb = fn;
2025 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2026 	    yornp_abort, NULL);
2027 
2028 	len = sizeof(ministate.prompt);
2029 	strlcpy(ministate.prompt, prompt, len);
2030 	strlcat(ministate.prompt, " (y or n) ", len);
2031 	redraw_tab(current_tab());
2032 }
2033 
2034 void
2035 ui_notify(const char *fmt, ...)
2036 {
2037 	va_list ap;
2038 
2039 	va_start(ap, fmt);
2040 	vmessage(fmt, ap);
2041 	va_end(ap);
2042 }
2043 
2044 void
2045 ui_end(void)
2046 {
2047 	endwin();
2048 }