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Date:: Thu Apr 1 09:41:10 2021 UTC
Message:: save session and reload it on startup
Actions:: History | Blame | Raw File
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_list_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		 session_new_tab_cb(const char*);
151 static void		 usage(void);
152 
153 static struct { short meta; int key; uint32_t cp; } thiskey;
154 
155 static WINDOW	*tabline, *body, *modeline, *minibuf;
156 static int	 body_lines, body_cols;
157 
158 static WINDOW		*help;
159 static struct window	 helpwin;
160 static int		 help_lines, help_cols;
161 
162 static int		 side_window;
163 
164 static struct event	clminibufev;
165 static struct timeval	clminibufev_timer = { 5, 0 };
166 static struct timeval	loadingev_timer = { 0, 250000 };
167 
168 static uint32_t		 tab_counter;
169 
170 static char	keybuf[64];
171 
172 static void (*yornp_cb)(int, void*);
173 static void *yornp_data;
174 
175 struct kmap global_map,
176 	minibuffer_map,
177 	*current_map,
178 	*base_map;
179 
180 static struct histhead eecmd_history,
181 	ir_history,
182 	lu_history;
183 
184 static int	in_minibuffer;
185 
186 static struct {
187 	char		*curmesg;
188 
189 	char		 prompt[64];
190 	void		 (*donefn)(void);
191 	void		 (*abortfn)(void);
192 
193 	char		 buf[1025];
194 	struct line	 line;
195 	struct vline	 vline;
196 	struct window	 window;
197 
198 	struct histhead	*history;
199 	struct hist	*hist_cur;
200 	size_t		 hist_off;
201 } ministate;
202 
203 struct lineprefix {
204 	const char	*prfx1;
205 	const char	*prfx2;
206 } line_prefixes[] = {
207 	[LINE_TEXT] =		{ "",		"" },
208 	[LINE_LINK] =		{ "=> ",	"   " },
209 	[LINE_TITLE_1] =	{ "# ",		"  " },
210 	[LINE_TITLE_2] =	{ "## ",	"   " },
211 	[LINE_TITLE_3] =	{ "### ",	"    " },
212 	[LINE_ITEM] =		{ "* ",		"  " },
213 	[LINE_QUOTE] =		{ "> ",		"  " },
214 	[LINE_PRE_START] =	{ "```",	"   " },
215 	[LINE_PRE_CONTENT] =	{ "",		"" },
216 	[LINE_PRE_END] =	{ "```",	"```" },
217 };
218 
219 static struct line_face {
220 	int prefix_prop;
221 	int text_prop;
222 } line_faces[] = {
223 	[LINE_TEXT] =		{ 0,		0 },
224 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
225 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
226 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
227 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
228 	[LINE_ITEM] =		{ 0,		0 },
229 	[LINE_QUOTE] =		{ 0,		A_DIM },
230 	[LINE_PRE_START] =	{ 0,		0 },
231 	[LINE_PRE_CONTENT] =	{ 0,		0 },
232 	[LINE_PRE_END] =	{ 0,		0 },
233 };
234 
235 static struct tab_face {
236 	int background, tab, current_tab;
237 } tab_face = {
238 	A_REVERSE, A_REVERSE, A_NORMAL
239 };
240 
241 static inline void
242 global_set_key(const char *key, void (*fn)(struct window*))
243 {
244 	if (!kmap_define_key(&global_map, key, fn))
245 		_exit(1);
246 }
247 
248 static inline void
249 minibuffer_set_key(const char *key, void (*fn)(struct window*))
250 {
251 	if (!kmap_define_key(&minibuffer_map, key, fn))
252 		_exit(1);
253 }
254 
255 static void
256 load_default_keys(void)
257 {
258 	/* === global map === */
259 
260 	/* emacs */
261 	global_set_key("C-p",		cmd_previous_line);
262 	global_set_key("C-n",		cmd_next_line);
263 	global_set_key("C-f",		cmd_forward_char);
264 	global_set_key("C-b",		cmd_backward_char);
265 	global_set_key("M-{",		cmd_backward_paragraph);
266 	global_set_key("M-}",		cmd_forward_paragraph);
267 	global_set_key("C-a",		cmd_move_beginning_of_line);
268 	global_set_key("C-e",		cmd_move_end_of_line);
269 
270 	global_set_key("M-v",		cmd_scroll_up);
271 	global_set_key("C-v",		cmd_scroll_down);
272 	global_set_key("M-space",	cmd_scroll_up);
273 	global_set_key("space",		cmd_scroll_down);
274 
275 	global_set_key("M-<",		cmd_beginning_of_buffer);
276 	global_set_key("M->",		cmd_end_of_buffer);
277 
278 	global_set_key("C-x C-c",	cmd_kill_telescope);
279 
280 	global_set_key("C-g",		cmd_clear_minibuf);
281 
282 	global_set_key("M-x",		cmd_execute_extended_command);
283 	global_set_key("C-x C-f",	cmd_load_url);
284 	global_set_key("C-x M-f",	cmd_load_current_url);
285 
286 	global_set_key("C-x t 0",	cmd_tab_close);
287 	global_set_key("C-x t 1",	cmd_tab_close_other);
288 	global_set_key("C-x t 2",	cmd_tab_new);
289 	global_set_key("C-x t o",	cmd_tab_next);
290 	global_set_key("C-x t O",	cmd_tab_previous);
291 	global_set_key("C-x t m",	cmd_tab_move);
292 	global_set_key("C-x t M",	cmd_tab_move_to);
293 
294 	global_set_key("C-M-b",		cmd_previous_page);
295 	global_set_key("C-M-f",		cmd_next_page);
296 
297 	global_set_key("<f7> a",	cmd_bookmark_page);
298 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
299 
300 	/* vi/vi-like */
301 	global_set_key("k",		cmd_previous_line);
302 	global_set_key("j",		cmd_next_line);
303 	global_set_key("l",		cmd_forward_char);
304 	global_set_key("h",		cmd_backward_char);
305 	global_set_key("{",		cmd_backward_paragraph);
306 	global_set_key("}",		cmd_forward_paragraph);
307 	global_set_key("^",		cmd_move_beginning_of_line);
308 	global_set_key("$",		cmd_move_end_of_line);
309 
310 	global_set_key("K",		cmd_scroll_line_up);
311 	global_set_key("J",		cmd_scroll_line_down);
312 
313 	global_set_key("g g",		cmd_beginning_of_buffer);
314 	global_set_key("G",		cmd_end_of_buffer);
315 
316 	global_set_key("g D",		cmd_tab_close);
317 	global_set_key("g N",		cmd_tab_new);
318 	global_set_key("g t",		cmd_tab_next);
319 	global_set_key("g T",		cmd_tab_previous);
320 	global_set_key("g M-t",		cmd_tab_move);
321 	global_set_key("g M-T",		cmd_tab_move_to);
322 
323 	global_set_key("H",		cmd_previous_page);
324 	global_set_key("L",		cmd_next_page);
325 
326 	/* tmp */
327 	global_set_key("q",		cmd_kill_telescope);
328 
329 	global_set_key("esc",		cmd_clear_minibuf);
330 
331 	global_set_key(":",		cmd_execute_extended_command);
332 
333 	/* cua */
334 	global_set_key("<up>",		cmd_previous_line);
335 	global_set_key("<down>",	cmd_next_line);
336 	global_set_key("<right>",	cmd_forward_char);
337 	global_set_key("<left>",	cmd_backward_char);
338 	global_set_key("<prior>",	cmd_scroll_up);
339 	global_set_key("<next>",	cmd_scroll_down);
340 
341 	global_set_key("M-<left>",	cmd_previous_page);
342 	global_set_key("M-<right>",	cmd_next_page);
343 
344 	/* "ncurses standard" */
345 	global_set_key("C-l",		cmd_redraw);
346 
347 	/* global */
348 	global_set_key("<f1>",		cmd_toggle_help);
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(body, 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(body, 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 	save_session();
595 	event_loopbreak();
596 }
597 
598 static void
599 cmd_push_button(struct window *window)
600 {
601 	struct vline	*vl;
602 	size_t		 nth;
603 
604 	nth = window->line_off + window->curs_y;
605 	if (nth >= window->line_max)
606 		return;
607 	vl = nth_line(window, nth);
608 	if (vl->parent->type != LINE_LINK)
609 		return;
610 
611 	load_url_in_tab(current_tab(), vl->parent->alt);
612 }
613 
614 static void
615 cmd_push_button_new_tab(struct window *window)
616 {
617 	struct vline	*vl;
618 	size_t		 nth;
619 
620 	nth = window->line_off + window->curs_y;
621 	if (nth > window->line_max)
622 		return;
623 	vl = nth_line(window, nth);
624 	if (vl->parent->type != LINE_LINK)
625 		return;
626 
627 	new_tab(vl->parent->alt);
628 }
629 
630 static void
631 cmd_previous_button(struct window *window)
632 {
633 	do {
634 		if (window->current_line == NULL ||
635 		    window->current_line == TAILQ_FIRST(&window->head)) {
636 			message("No previous link");
637 			return;
638 		}
639 		cmd_previous_line(window);
640 	} while (window->current_line->parent->type != LINE_LINK);
641 }
642 
643 static void
644 cmd_next_button(struct window *window)
645 {
646 	do {
647 		if (window->current_line == NULL ||
648 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
649 			message("No next link");
650 			return;
651 		}
652 		cmd_next_line(window);
653 	} while (window->current_line->parent->type != LINE_LINK);
654 }
655 
656 static void
657 cmd_previous_page(struct window *window)
658 {
659 	struct tab *tab = current_tab();
660 
661 	if (!load_previous_page(tab))
662 		message("No previous page");
663 	else
664 		start_loading_anim(tab);
665 }
666 
667 static void
668 cmd_next_page(struct window *window)
669 {
670 	struct tab *tab = current_tab();
671 
672 	if (!load_next_page(tab))
673 		message("No next page");
674 	else
675 		start_loading_anim(tab);
676 }
677 
678 static void
679 cmd_clear_minibuf(struct window *window)
680 {
681 	handle_clear_minibuf(0, 0, NULL);
682 }
683 
684 static void
685 cmd_execute_extended_command(struct window *window)
686 {
687 	size_t	 len;
688 
689 	if (in_minibuffer) {
690 		message("We don't have enable-recursive-minibuffers");
691 		return;
692 	}
693 
694 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
695 	    &eecmd_history);
696 
697 	len = sizeof(ministate.prompt);
698 	strlcpy(ministate.prompt, "", len);
699 
700 	if (thiskey.meta)
701 		strlcat(ministate.prompt, "M-", len);
702 
703 	strlcat(ministate.prompt, keyname(thiskey.key), len);
704 	strlcat(ministate.prompt, " ", len);
705 }
706 
707 static void
708 cmd_tab_close(struct window *window)
709 {
710 	struct tab *tab, *t;
711 
712 	tab = current_tab();
713 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
714 	    TAILQ_NEXT(tab, tabs) == NULL) {
715 		message("Can't close the only tab.");
716 		return;
717 	}
718 
719 	if (evtimer_pending(&tab->loadingev, NULL))
720 		evtimer_del(&tab->loadingev);
721 
722 	stop_tab(tab);
723 
724 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
725 		t = TAILQ_NEXT(tab, tabs);
726 	TAILQ_REMOVE(&tabshead, tab, tabs);
727 	free(tab);
728 
729 	switch_to_tab(t);
730 }
731 
732 static void
733 cmd_tab_close_other(struct window *window)
734 {
735 	struct tab *t, *i;
736 
737 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
738 		if (t->flags & TAB_CURRENT)
739 			continue;
740 
741 		stop_tab(t);
742 		TAILQ_REMOVE(&tabshead, t, tabs);
743 		free(t);
744 	}
745 }
746 
747 static void
748 cmd_tab_new(struct window *window)
749 {
750 	new_tab(NEW_TAB_URL);
751 }
752 
753 static void
754 cmd_tab_next(struct window *window)
755 {
756 	struct tab *tab, *t;
757 
758 	tab = current_tab();
759 	tab->flags &= ~TAB_CURRENT;
760 
761 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
762 		t = TAILQ_FIRST(&tabshead);
763 	t->flags |= TAB_CURRENT;
764 }
765 
766 static void
767 cmd_tab_previous(struct window *window)
768 {
769 	struct tab *tab, *t;
770 
771 	tab = current_tab();
772 	tab->flags &= ~TAB_CURRENT;
773 
774 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
775 		t = TAILQ_LAST(&tabshead, tabshead);
776 	t->flags |= TAB_CURRENT;
777 }
778 
779 static void
780 cmd_tab_move(struct window *window)
781 {
782 	struct tab *tab, *t;
783 
784 	tab = current_tab();
785 	t = TAILQ_NEXT(tab, tabs);
786 	TAILQ_REMOVE(&tabshead, tab, tabs);
787 
788 	if (t == NULL)
789 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
790 	else
791 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
792 }
793 
794 static void
795 cmd_tab_move_to(struct window *window)
796 {
797 	struct tab *tab, *t;
798 
799 	tab = current_tab();
800 	t = TAILQ_PREV(tab, tabshead, tabs);
801 	TAILQ_REMOVE(&tabshead, tab, tabs);
802 
803 	if (t == NULL) {
804 		if (TAILQ_EMPTY(&tabshead))
805 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
806 		else
807 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
808 	} else
809 		TAILQ_INSERT_BEFORE(t, tab, tabs);
810 }
811 
812 static void
813 cmd_load_url(struct window *window)
814 {
815 	if (in_minibuffer) {
816 		message("We don't have enable-recursive-minibuffers");
817 		return;
818 	}
819 
820 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
821 	    &lu_history);
822 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
823 }
824 
825 static void
826 cmd_load_current_url(struct window *window)
827 {
828 	struct tab *tab = current_tab();
829 
830 	if (in_minibuffer) {
831 		message("We don't have enable-recursive-minibuffers");
832 		return;
833 	}
834 
835 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
836 	    &lu_history);
837 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
838 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
839 	ministate.window.cpoff = utf8_cplen(ministate.buf);
840 }
841 
842 static void
843 cmd_bookmark_page(struct window *window)
844 {
845 	struct tab *tab = current_tab();
846 
847 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
848 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
849 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
850 	ministate.window.cpoff = utf8_cplen(ministate.buf);
851 }
852 
853 static void
854 cmd_list_bookmarks(struct window *window)
855 {
856 	load_url_in_tab(current_tab(), "about:bookmarks");
857 }
858 
859 static void
860 cmd_toggle_help(struct window *window)
861 {
862 	side_window = !side_window;
863 	if (side_window)
864 		recompute_help();
865 
866 	/* ugly hack, but otherwise the window doesn't get updated
867 	 * until I call handle_resize a second time (i.e. C-l).  I
868 	 * will be happy to know why something like this is needed. */
869 	handle_resize(0, 0, NULL);
870 	handle_resize(0, 0, NULL);
871 }
872 
873 static void
874 cmd_mini_delete_char(struct window *window)
875 {
876 	char *c, *n;
877 
878 	if (!in_minibuffer) {
879 		message("text is read-only");
880 		return;
881 	}
882 
883 	minibuffer_taint_hist();
884 
885 	c = utf8_nth(window->current_line->line, window->cpoff);
886 	if (*c == '\0')
887 		return;
888 	n = utf8_next_cp(c);
889 
890 	memmove(c, n, strlen(n)+1);
891 }
892 
893 static void
894 cmd_mini_delete_backward_char(struct window *window)
895 {
896 	char *c, *p, *start;
897 
898 	if (!in_minibuffer) {
899 		message("text is read-only");
900 		return;
901 	}
902 
903 	minibuffer_taint_hist();
904 
905 	c = utf8_nth(window->current_line->line, window->cpoff);
906 	start = window->current_line->line;
907 	if (c == start)
908 		return;
909 	p = utf8_prev_cp(c-1, start);
910 
911 	memmove(p, c, strlen(c)+1);
912 	window->cpoff--;
913 }
914 
915 static void
916 cmd_mini_kill_line(struct window *window)
917 {
918 	char *c;
919 
920 	if (!in_minibuffer) {
921 		message("text is read-only");
922 		return;
923 	}
924 
925 	minibuffer_taint_hist();
926 	c = utf8_nth(window->current_line->line, window->cpoff);
927 	*c = '\0';
928 }
929 
930 static void
931 cmd_mini_abort(struct window *window)
932 {
933 	if (!in_minibuffer)
934 		return;
935 
936 	ministate.abortfn();
937 }
938 
939 static void
940 cmd_mini_complete_and_exit(struct window *window)
941 {
942 	if (!in_minibuffer)
943 		return;
944 
945 	minibuffer_taint_hist();
946 	ministate.donefn();
947 }
948 
949 static void
950 cmd_mini_previous_history_element(struct window *window)
951 {
952 	if (ministate.history == NULL) {
953 		message("No history");
954 		return;
955 	}
956 
957 	if (ministate.hist_cur == NULL ||
958 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
959 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
960 		ministate.hist_off = ministate.history->len - 1;
961 		if (ministate.hist_cur == NULL)
962 			message("No prev item");
963 	} else {
964 		ministate.hist_off--;
965 	}
966 
967 	if (ministate.hist_cur != NULL)
968 		window->current_line->line = ministate.hist_cur->h;
969 }
970 
971 static void
972 cmd_mini_next_history_element(struct window *window)
973 {
974 	if (ministate.history == NULL) {
975 		message("No history");
976 		return;
977 	}
978 
979 	if (ministate.hist_cur == NULL ||
980 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
981 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
982 		ministate.hist_off = 0;
983 		if (ministate.hist_cur == NULL)
984 			message("No next item");
985 	} else {
986 		ministate.hist_off++;
987 	}
988 
989 	if (ministate.hist_cur != NULL)
990 		window->current_line->line = ministate.hist_cur->h;
991 }
992 
993 static void
994 global_key_unbound(void)
995 {
996 	message("%s is undefined", keybuf);
997 }
998 
999 static void
1000 minibuffer_hist_save_entry(void)
1001 {
1002 	struct hist	*hist;
1003 
1004 	if (ministate.history == NULL)
1005 		return;
1006 
1007 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1008 		abort();
1009 
1010 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1011 
1012 	if (TAILQ_EMPTY(&ministate.history->head))
1013 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1014 	else
1015 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1016 	ministate.history->len++;
1017 }
1018 
1019 /*
1020  * taint the minibuffer cache: if we're currently showing a history
1021  * element, copy that to the current buf and reset the "history
1022  * navigation" thing.
1023  */
1024 static void
1025 minibuffer_taint_hist(void)
1026 {
1027 	if (ministate.hist_cur == NULL)
1028 		return;
1029 
1030 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1031 	ministate.hist_cur = NULL;
1032 }
1033 
1034 static void
1035 minibuffer_self_insert(void)
1036 {
1037 	char	*c, tmp[5] = {0};
1038 	size_t	len;
1039 
1040 	minibuffer_taint_hist();
1041 
1042 	if (thiskey.cp == 0)
1043 		return;
1044 
1045 	len = utf8_encode(thiskey.cp, tmp);
1046 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1047 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1048 		return;
1049 
1050 	memmove(c + len, c, strlen(c)+1);
1051 	memcpy(c, tmp, len);
1052 	ministate.window.cpoff++;
1053 }
1054 
1055 static void
1056 eecmd_self_insert(void)
1057 {
1058 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1059 	    !unicode_isgraph(thiskey.cp)) {
1060 		global_key_unbound();
1061 		return;
1062 	}
1063 
1064 	minibuffer_self_insert();
1065 }
1066 
1067 static void
1068 eecmd_select(void)
1069 {
1070 	struct cmds *cmd;
1071 
1072 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1073 		if (!strcmp(cmd->cmd, ministate.buf)) {
1074 			exit_minibuffer();
1075 			minibuffer_hist_save_entry();
1076 			cmd->fn(current_window());
1077 			return;
1078 		}
1079 	}
1080 
1081 	message("No match");
1082 }
1083 
1084 static void
1085 ir_self_insert(void)
1086 {
1087 	minibuffer_self_insert();
1088 }
1089 
1090 static void
1091 ir_select(void)
1092 {
1093 	char		 buf[1025] = {0};
1094 	struct url	 url;
1095 	struct tab	*tab;
1096 
1097 	tab = current_tab();
1098 
1099 	exit_minibuffer();
1100 	minibuffer_hist_save_entry();
1101 
1102 	/* a bit ugly but... */
1103 	memcpy(&url, &tab->url, sizeof(tab->url));
1104 	url_set_query(&url, ministate.buf);
1105 	url_unparse(&url, buf, sizeof(buf));
1106 	load_url_in_tab(tab, buf);
1107 }
1108 
1109 static void
1110 lu_self_insert(void)
1111 {
1112 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1113 	    !unicode_isgraph(thiskey.key)) {
1114 		global_key_unbound();
1115 		return;
1116 	}
1117 
1118 	minibuffer_self_insert();
1119 }
1120 
1121 static void
1122 lu_select(void)
1123 {
1124 	exit_minibuffer();
1125 	minibuffer_hist_save_entry();
1126 	load_url_in_tab(current_tab(), ministate.buf);
1127 }
1128 
1129 static void
1130 bp_select(void)
1131 {
1132 	exit_minibuffer();
1133 	if (*ministate.buf != '\0')
1134 		add_to_bookmarks(ministate.buf);
1135 	else
1136 		message("Abort.");
1137 }
1138 
1139 static void
1140 yornp_self_insert(void)
1141 {
1142 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1143 		message("Please answer y or n");
1144 		return;
1145 	}
1146 
1147 	yornp_cb(thiskey.key == 'y', yornp_data);
1148 	yornp_data = NULL;
1149 	exit_minibuffer();
1150 }
1151 
1152 static void
1153 yornp_abort(void)
1154 {
1155 	yornp_cb(0, yornp_data);
1156 	yornp_data = NULL;
1157 	exit_minibuffer();
1158 }
1159 
1160 static struct vline *
1161 nth_line(struct window *window, size_t n)
1162 {
1163 	struct vline	*vl;
1164 	size_t		 i;
1165 
1166 	i = 0;
1167 	TAILQ_FOREACH(vl, &window->head, vlines) {
1168 		if (i == n)
1169 			return vl;
1170 		i++;
1171 	}
1172 
1173 	/* unreachable */
1174 	abort();
1175 }
1176 
1177 static struct tab *
1178 current_tab(void)
1179 {
1180 	struct tab *t;
1181 
1182 	TAILQ_FOREACH(t, &tabshead, tabs) {
1183 		if (t->flags & TAB_CURRENT)
1184 			return t;
1185 	}
1186 
1187 	/* unreachable */
1188 	abort();
1189 }
1190 
1191 static struct window *
1192 current_window(void)
1193 {
1194 	if (in_minibuffer)
1195 		return &ministate.window;
1196 	return &current_tab()->window;
1197 }
1198 
1199 static int
1200 readkey(void)
1201 {
1202 	uint32_t state = 0;
1203 
1204 	if ((thiskey.key = wgetch(body)) == ERR)
1205 		return 0;
1206 
1207 	thiskey.meta = thiskey.key == 27;
1208 	if (thiskey.meta) {
1209 		thiskey.key = wgetch(body);
1210 		if (thiskey.key == ERR || thiskey.key == 27) {
1211 			thiskey.meta = 0;
1212 			thiskey.key = 27;
1213 		}
1214 	}
1215 
1216 	thiskey.cp = 0;
1217 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1218 		while (1) {
1219 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1220 				break;
1221 			if ((thiskey.key = wgetch(body)) == ERR) {
1222 				message("Error decoding user input");
1223 				return 0;
1224 			}
1225 		}
1226 	}
1227 
1228 	return 1;
1229 }
1230 
1231 static void
1232 dispatch_stdio(int fd, short ev, void *d)
1233 {
1234 	struct keymap	*k;
1235 	const char	*keyname;
1236 	char		 tmp[5] = {0};
1237 
1238 	if (!readkey())
1239 		return;
1240 
1241 	if (keybuf[0] != '\0')
1242 		strlcat(keybuf, " ", sizeof(keybuf));
1243 	if (thiskey.meta)
1244 		strlcat(keybuf, "M-", sizeof(keybuf));
1245 	if (thiskey.cp != 0) {
1246 		utf8_encode(thiskey.cp, tmp);
1247 		strlcat(keybuf, tmp, sizeof(keybuf));
1248 	} else {
1249 		if ((keyname = unkbd(thiskey.key)) != NULL)
1250 			strlcat(keybuf, keyname, sizeof(keybuf));
1251 		else {
1252 			tmp[0] = thiskey.key;
1253 			strlcat(keybuf, tmp, sizeof(keybuf));
1254 		}
1255 	}
1256 
1257 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1258 		if (k->meta == thiskey.meta &&
1259 		    k->key == thiskey.key) {
1260 			if (k->fn == NULL)
1261 				current_map = &k->map;
1262 			else {
1263 				current_map = base_map;
1264 				strlcpy(keybuf, "", sizeof(keybuf));
1265 				k->fn(current_window());
1266 			}
1267 			goto done;
1268 		}
1269 	}
1270 
1271 	if (current_map->unhandled_input != NULL)
1272 		current_map->unhandled_input();
1273 	else {
1274 		global_key_unbound();
1275 	}
1276 
1277 	strlcpy(keybuf, "", sizeof(keybuf));
1278 	current_map = base_map;
1279 
1280 done:
1281 	if (side_window)
1282 		recompute_help();
1283 
1284 	redraw_tab(current_tab());
1285 }
1286 
1287 static void
1288 handle_clear_minibuf(int fd, short ev, void *d)
1289 {
1290 	free(ministate.curmesg);
1291 	ministate.curmesg = NULL;
1292 
1293 	redraw_minibuffer();
1294 	if (in_minibuffer) {
1295 		wrefresh(body);
1296 		wrefresh(minibuf);
1297 	} else {
1298 		wrefresh(minibuf);
1299 		wrefresh(body);
1300 	}
1301 }
1302 
1303 static void
1304 handle_resize(int sig, short ev, void *d)
1305 {
1306 	struct tab	*tab;
1307 
1308 	endwin();
1309 	refresh();
1310 	clear();
1311 
1312 	/* move and resize the windows, in reverse order! */
1313 
1314 	mvwin(minibuf, LINES-1, 0);
1315 	wresize(minibuf, 1, COLS);
1316 
1317 	mvwin(modeline, LINES-2, 0);
1318 	wresize(modeline, 1, COLS);
1319 
1320 	body_lines = LINES-3;
1321 	body_cols = COLS;
1322 
1323 	if (side_window) {
1324 		help_cols = 0.3 * COLS;
1325 		help_lines = LINES-3;
1326 		mvwin(help, 1, 0);
1327 		wresize(help, help_lines, help_cols);
1328 
1329 		wrap_page(&helpwin, help_cols);
1330 
1331 		body_cols = COLS - help_cols - 1;
1332 		mvwin(body, 1, help_cols);
1333 	} else
1334 		mvwin(body, 1, 0);
1335 
1336 	wresize(body, body_lines, body_cols);
1337 
1338 	wresize(tabline, 1, COLS);
1339 
1340 	tab = current_tab();
1341 
1342 	wrap_page(&tab->window, body_cols);
1343 	redraw_tab(tab);
1344 }
1345 
1346 static int
1347 wrap_page(struct window *window, int width)
1348 {
1349 	struct line		*l;
1350 	const struct line	*orig;
1351 	struct vline		*vl;
1352 	const char		*prfx;
1353 
1354 	orig = window->current_line == NULL
1355 		? NULL
1356 		: window->current_line->parent;
1357 	window->current_line = NULL;
1358 
1359 	window->curs_y = 0;
1360 	window->line_off = 0;
1361 
1362 	empty_vlist(window);
1363 
1364 	TAILQ_FOREACH(l, &window->page.head, lines) {
1365 		prfx = line_prefixes[l->type].prfx1;
1366 		switch (l->type) {
1367 		case LINE_TEXT:
1368 		case LINE_LINK:
1369 		case LINE_TITLE_1:
1370 		case LINE_TITLE_2:
1371 		case LINE_TITLE_3:
1372 		case LINE_ITEM:
1373 		case LINE_QUOTE:
1374 		case LINE_PRE_START:
1375 		case LINE_PRE_END:
1376 			wrap_text(window, prfx, l, width);
1377 			break;
1378 		case LINE_PRE_CONTENT:
1379                         hardwrap_text(window, l, width);
1380 			break;
1381 		}
1382 
1383 		if (orig == l && window->current_line == NULL) {
1384 			window->line_off = window->line_max-1;
1385 			window->current_line = TAILQ_LAST(&window->head, vhead);
1386 
1387 			while (1) {
1388 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1389 				if (vl == NULL || vl->parent != orig)
1390 					break;
1391 				window->current_line = vl;
1392 				window->line_off--;
1393 			}
1394 		}
1395 	}
1396 
1397         if (window->current_line == NULL)
1398 		window->current_line = TAILQ_FIRST(&window->head);
1399 
1400 	return 1;
1401 }
1402 
1403 static void
1404 print_vline(WINDOW *window, struct vline *vl)
1405 {
1406 	const char *text = vl->line;
1407 	const char *prfx;
1408 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1409 	int text_face = line_faces[vl->parent->type].text_prop;
1410 
1411 	if (!vl->flags)
1412 		prfx = line_prefixes[vl->parent->type].prfx1;
1413 	else
1414 		prfx = line_prefixes[vl->parent->type].prfx2;
1415 
1416 	if (text == NULL)
1417 		text = "";
1418 
1419 	wattron(window, prefix_face);
1420 	wprintw(window, "%s", prfx);
1421 	wattroff(window, prefix_face);
1422 
1423 	wattron(window, text_face);
1424 	wprintw(window, "%s", text);
1425 	wattroff(window, text_face);
1426 }
1427 
1428 static void
1429 redraw_tabline(void)
1430 {
1431 	struct tab	*tab;
1432 	size_t		 toskip;
1433 	int		 current, x, y, truncated;
1434 	const char	*title;
1435 	char		 buf[25];
1436 
1437 	toskip = 0;
1438 	x = 1;
1439 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1440 		x += sizeof(buf) + 1;
1441 		toskip++;
1442 		if (tab->flags & TAB_CURRENT)
1443 			break;
1444 	}
1445 	if (x < COLS-2)
1446 		toskip = 0;
1447 	else
1448 		toskip--;
1449 
1450 	werase(tabline);
1451 	wattron(tabline, tab_face.background);
1452 	wprintw(tabline, toskip == 0 ? " " : "<");
1453 	wattroff(tabline, tab_face.background);
1454 
1455 	truncated = 0;
1456 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1457 		if (truncated)
1458 			break;
1459 		if (toskip != 0) {
1460 			toskip--;
1461 			continue;
1462 		}
1463 
1464 		getyx(tabline, y, x);
1465 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1466 			truncated = 1;
1467 
1468 		current = tab->flags & TAB_CURRENT;
1469 
1470 		if (*(title = tab->window.page.title) == '\0')
1471 			title = tab->hist_cur->h;
1472 
1473 		strlcpy(buf, " ", sizeof(buf));
1474                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1475 			/* truncation happens */
1476 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1477 		} else {
1478 			/* pad with spaces */
1479 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1480 				/* nop */ ;
1481 		}
1482 
1483 		if (current)
1484 			wattron(tabline, tab_face.current_tab);
1485 		else
1486 			wattron(tabline, tab_face.tab);
1487 
1488 		wprintw(tabline, "%s", buf);
1489 		if (TAILQ_NEXT(tab, tabs) != NULL)
1490 			wprintw(tabline, " ");
1491 
1492 		if (current)
1493 			wattroff(tabline, tab_face.current_tab);
1494 		else
1495 			wattroff(tabline, tab_face.tab);
1496 	}
1497 
1498 	wattron(tabline, tab_face.background);
1499 	for (; x < COLS; ++x)
1500 		waddch(tabline, ' ');
1501 	if (truncated)
1502 		mvwprintw(tabline, 0, COLS-1, ">");
1503 }
1504 
1505 static void
1506 redraw_window(WINDOW *win, int height, struct window *window)
1507 {
1508 	struct vline	*vl;
1509 	int		 l;
1510 
1511 	werase(win);
1512 
1513 	window->line_off = MIN(window->line_max-1, window->line_off);
1514 	if (TAILQ_EMPTY(&window->head))
1515 		return;
1516 
1517 	l = 0;
1518 	vl = nth_line(window, window->line_off);
1519 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1520 		wmove(win, l, 0);
1521 		print_vline(win, vl);
1522 		l++;
1523 		if (l == height)
1524 			break;
1525 	}
1526 
1527 	wmove(win, window->curs_y, window->curs_x);
1528 }
1529 
1530 static void
1531 redraw_help(void)
1532 {
1533 	redraw_window(help, help_lines, &helpwin);
1534 }
1535 
1536 static void
1537 redraw_body(struct tab *tab)
1538 {
1539 	redraw_window(body, body_lines, &tab->window);
1540 }
1541 
1542 static inline char
1543 trust_status_char(enum trust_state ts)
1544 {
1545 	switch (ts) {
1546 	case TS_UNKNOWN:	return 'u';
1547 	case TS_UNTRUSTED:	return '!';
1548 	case TS_TRUSTED:	return 'v';
1549 	case TS_VERIFIED:	return 'V';
1550 	}
1551 }
1552 
1553 static void
1554 redraw_modeline(struct tab *tab)
1555 {
1556 	double		 pct;
1557 	int		 x, y, max_x, max_y;
1558 	const char	*mode = tab->window.page.name;
1559 	const char	*spin = "-\\|/";
1560 
1561 	werase(modeline);
1562 	wattron(modeline, A_REVERSE);
1563 	wmove(modeline, 0, 0);
1564 
1565 	wprintw(modeline, "-%c%c %s ",
1566 	    spin[tab->loading_anim_step],
1567 	    trust_status_char(tab->trust),
1568 	    mode == NULL ? "(none)" : mode);
1569 
1570 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1571 
1572 	if (tab->window.line_max <= (size_t)body_lines)
1573                 wprintw(modeline, "All ");
1574 	else if (tab->window.line_off == 0)
1575                 wprintw(modeline, "Top ");
1576 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1577 		wprintw(modeline, "Bottom ");
1578 	else
1579 		wprintw(modeline, "%.0f%% ", pct);
1580 
1581 	wprintw(modeline, "%d/%d %s ",
1582 	    tab->window.line_off + tab->window.curs_y,
1583 	    tab->window.line_max,
1584 	    tab->hist_cur->h);
1585 
1586 	getyx(modeline, y, x);
1587 	getmaxyx(modeline, max_y, max_x);
1588 
1589 	(void)y;
1590 	(void)max_y;
1591 
1592 	for (; x < max_x; ++x)
1593 		waddstr(modeline, "-");
1594 }
1595 
1596 static void
1597 redraw_minibuffer(void)
1598 {
1599 	struct tab *tab;
1600 	size_t off_y, off_x = 0;
1601 	char *start, *c;
1602 
1603 	werase(minibuf);
1604 
1605 	if (in_minibuffer) {
1606 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1607 		if (ministate.hist_cur != NULL)
1608 			wprintw(minibuf, "(%zu/%zu) ",
1609 			    ministate.hist_off + 1,
1610 			    ministate.history->len);
1611 
1612 		getyx(minibuf, off_y, off_x);
1613 
1614 		start = ministate.hist_cur != NULL
1615 			? ministate.hist_cur->h
1616 			: ministate.buf;
1617 		c = utf8_nth(ministate.window.current_line->line,
1618 		    ministate.window.cpoff);
1619 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1620 			start = utf8_next_cp(start);
1621 		}
1622 
1623 		waddstr(minibuf, start);
1624 	}
1625 
1626 	if (ministate.curmesg != NULL)
1627                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1628 		    ministate.curmesg);
1629 
1630 	if (!in_minibuffer && ministate.curmesg == NULL)
1631 		waddstr(minibuf, keybuf);
1632 
1633 	/* If nothing else, show the URL at point */
1634 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1635 		tab = current_tab();
1636 		if (tab->window.current_line != NULL &&
1637 		    tab->window.current_line->parent->type == LINE_LINK)
1638 			waddstr(minibuf, tab->window.current_line->parent->alt);
1639 	}
1640 
1641 	if (in_minibuffer)
1642 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1643 }
1644 
1645 static void
1646 redraw_tab(struct tab *tab)
1647 {
1648 	if (side_window) {
1649 		redraw_help();
1650 		wnoutrefresh(help);
1651 	}
1652 
1653 	redraw_tabline();
1654 	redraw_body(tab);
1655 	redraw_modeline(tab);
1656 	redraw_minibuffer();
1657 
1658 	wnoutrefresh(tabline);
1659 	wnoutrefresh(modeline);
1660 
1661 	if (in_minibuffer) {
1662 		wnoutrefresh(body);
1663 		wnoutrefresh(minibuf);
1664 	} else {
1665 		wnoutrefresh(minibuf);
1666 		wnoutrefresh(body);
1667 	}
1668 
1669 	doupdate();
1670 }
1671 
1672 static void
1673 emit_help_item(char *prfx, void *fn)
1674 {
1675 	struct line	*l;
1676 	struct cmds	*cmd;
1677 
1678 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1679 		if (fn == cmd->fn)
1680 			break;
1681 	}
1682 	assert(cmd != NULL);
1683 
1684 	if ((l = calloc(1, sizeof(*l))) == NULL)
1685 		abort();
1686 
1687 	l->type = LINE_TEXT;
1688 	l->alt = NULL;
1689 
1690 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1691 
1692 	if (TAILQ_EMPTY(&helpwin.page.head))
1693 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1694 	else
1695 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1696 }
1697 
1698 static void
1699 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1700 {
1701 	struct keymap	*k;
1702 	char		 p[32];
1703 	const char	*kn;
1704 
1705 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1706 		strlcpy(p, prfx, sizeof(p));
1707 		if (*p != '\0')
1708 			strlcat(p, " ", sizeof(p));
1709 		if (k->meta)
1710 			strlcat(p, "M-", sizeof(p));
1711 		if ((kn = unkbd(k->key)) != NULL)
1712 			strlcat(p, kn, sizeof(p));
1713 		else
1714 			strlcat(p, keyname(k->key), sizeof(p));
1715 
1716 		if (k->fn == NULL)
1717 			rec_compute_help(&k->map, p, sizeof(p));
1718 		else
1719 			emit_help_item(p, k->fn);
1720 	}
1721 }
1722 
1723 static void
1724 recompute_help(void)
1725 {
1726 	char	p[32] = { 0 };
1727 
1728 	empty_vlist(&helpwin);
1729 	empty_linelist(&helpwin);
1730 	rec_compute_help(current_map, p, sizeof(p));
1731 	wrap_page(&helpwin, help_cols);
1732 }
1733 
1734 static void
1735 vmessage(const char *fmt, va_list ap)
1736 {
1737 	if (evtimer_pending(&clminibufev, NULL))
1738 		evtimer_del(&clminibufev);
1739 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1740 	evtimer_add(&clminibufev, &clminibufev_timer);
1741 
1742 	free(ministate.curmesg);
1743 
1744 	/* TODO: what to do if the allocation fails here? */
1745 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1746 		ministate.curmesg = NULL;
1747 
1748 	redraw_minibuffer();
1749 	if (in_minibuffer) {
1750 		wrefresh(body);
1751 		wrefresh(minibuf);
1752 	} else {
1753 		wrefresh(minibuf);
1754 		wrefresh(body);
1755 	}
1756 }
1757 
1758 static void
1759 message(const char *fmt, ...)
1760 {
1761 	va_list ap;
1762 
1763 	va_start(ap, fmt);
1764 	vmessage(fmt, ap);
1765 	va_end(ap);
1766 }
1767 
1768 static void
1769 start_loading_anim(struct tab *tab)
1770 {
1771 	if (tab->loading_anim)
1772 		return;
1773 	tab->loading_anim = 1;
1774 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1775 	evtimer_add(&tab->loadingev, &loadingev_timer);
1776 }
1777 
1778 static void
1779 update_loading_anim(int fd, short ev, void *d)
1780 {
1781 	struct tab	*tab = d;
1782 
1783 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1784 
1785 	if (tab->flags & TAB_CURRENT) {
1786 		redraw_modeline(tab);
1787 		wrefresh(modeline);
1788 		wrefresh(body);
1789 		if (in_minibuffer)
1790 			wrefresh(minibuf);
1791 	}
1792 
1793 	evtimer_add(&tab->loadingev, &loadingev_timer);
1794 }
1795 
1796 static void
1797 stop_loading_anim(struct tab *tab)
1798 {
1799 	if (!tab->loading_anim)
1800 		return;
1801 	evtimer_del(&tab->loadingev);
1802 	tab->loading_anim = 0;
1803 	tab->loading_anim_step = 0;
1804 
1805 	if (!(tab->flags & TAB_CURRENT))
1806 		return;
1807 
1808 	redraw_modeline(tab);
1809 
1810 	wrefresh(modeline);
1811 	wrefresh(body);
1812 	if (in_minibuffer)
1813 		wrefresh(minibuf);
1814 }
1815 
1816 static void
1817 load_url_in_tab(struct tab *tab, const char *url)
1818 {
1819 	message("Loading %s...", url);
1820 	start_loading_anim(tab);
1821 	load_url(tab, url);
1822 
1823 	tab->window.curs_x = 0;
1824 	tab->window.curs_y = 0;
1825 	redraw_tab(tab);
1826 }
1827 
1828 static void
1829 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1830     void (*abortfn)(void), struct histhead *hist)
1831 {
1832 	in_minibuffer = 1;
1833 	base_map = &minibuffer_map;
1834 	current_map = &minibuffer_map;
1835 
1836 	base_map->unhandled_input = self_insert_fn;
1837 
1838 	ministate.donefn = donefn;
1839 	ministate.abortfn = abortfn;
1840 	memset(ministate.buf, 0, sizeof(ministate.buf));
1841 	ministate.window.current_line = &ministate.vline;
1842 	ministate.window.current_line->line = ministate.buf;
1843 	ministate.window.cpoff = 0;
1844 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1845 
1846 	ministate.history = hist;
1847 	ministate.hist_cur = NULL;
1848 	ministate.hist_off = 0;
1849 }
1850 
1851 static void
1852 exit_minibuffer(void)
1853 {
1854 	werase(minibuf);
1855 
1856 	in_minibuffer = 0;
1857 	base_map = &global_map;
1858 	current_map = &global_map;
1859 }
1860 
1861 static void
1862 switch_to_tab(struct tab *tab)
1863 {
1864 	struct tab	*t;
1865 
1866 	TAILQ_FOREACH(t, &tabshead, tabs) {
1867 		t->flags &= ~TAB_CURRENT;
1868 	}
1869 
1870 	tab->flags |= TAB_CURRENT;
1871 }
1872 
1873 static struct tab *
1874 new_tab(const char *url)
1875 {
1876 	struct tab	*tab;
1877 
1878 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1879 		event_loopbreak();
1880 		return NULL;
1881 	}
1882 
1883 	TAILQ_INIT(&tab->hist.head);
1884 
1885 	TAILQ_INIT(&tab->window.head);
1886 
1887 	tab->id = tab_counter++;
1888 	switch_to_tab(tab);
1889 
1890 	if (TAILQ_EMPTY(&tabshead))
1891 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1892 	else
1893 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1894 
1895 	load_url_in_tab(tab, url);
1896 	return tab;
1897 }
1898 
1899 static void
1900 session_new_tab_cb(const char *url)
1901 {
1902 	new_tab(url);
1903 }
1904 
1905 static void
1906 usage(void)
1907 {
1908 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1909 }
1910 
1911 int
1912 ui_init(int argc, char * const *argv)
1913 {
1914 	const char *url = NEW_TAB_URL;
1915 	int ch;
1916 
1917 	while ((ch = getopt(argc, argv, "")) != -1) {
1918 		switch (ch) {
1919 		default:
1920 			usage();
1921 			return 0;
1922 		}
1923 	}
1924 	argc -= optind;
1925 	argv += optind;
1926 
1927 	if (argc != 0)
1928 		url = argv[0];
1929 
1930 	setlocale(LC_ALL, "");
1931 
1932 	TAILQ_INIT(&global_map.m);
1933 	global_map.unhandled_input = global_key_unbound;
1934 
1935 	TAILQ_INIT(&minibuffer_map.m);
1936 
1937 	TAILQ_INIT(&eecmd_history.head);
1938 	TAILQ_INIT(&ir_history.head);
1939 	TAILQ_INIT(&lu_history.head);
1940 
1941 	ministate.line.type = LINE_TEXT;
1942 	ministate.vline.parent = &ministate.line;
1943 	ministate.window.current_line = &ministate.vline;
1944 
1945 	/* initialize help window */
1946 	TAILQ_INIT(&helpwin.head);
1947 
1948 	base_map = &global_map;
1949 	current_map = &global_map;
1950 	load_default_keys();
1951 
1952 	initscr();
1953 	raw();
1954 	noecho();
1955 
1956 	nonl();
1957 	intrflush(stdscr, FALSE);
1958 
1959 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1960 		return 0;
1961 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1962 		return 0;
1963 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1964 		return 0;
1965 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1966 		return 0;
1967 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1968 		return 0;
1969 
1970 	body_lines = LINES-3;
1971 	body_cols = COLS;
1972 
1973 	keypad(body, TRUE);
1974 	scrollok(body, TRUE);
1975 
1976 	/* non-blocking input */
1977 	wtimeout(body, 0);
1978 
1979 	mvwprintw(body, 0, 0, "");
1980 
1981 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1982 	event_add(&stdioev, NULL);
1983 
1984 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1985 	signal_add(&winchev, NULL);
1986 
1987 	load_last_session(session_new_tab_cb);
1988 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
1989 		new_tab(url);
1990 
1991 	return 1;
1992 }
1993 
1994 void
1995 ui_on_tab_loaded(struct tab *tab)
1996 {
1997 	stop_loading_anim(tab);
1998 	message("Loaded %s", tab->hist_cur->h);
1999 
2000 	redraw_tabline();
2001 	wrefresh(tabline);
2002 	if (in_minibuffer)
2003 		wrefresh(minibuf);
2004 	else
2005 		wrefresh(body);
2006 }
2007 
2008 void
2009 ui_on_tab_refresh(struct tab *tab)
2010 {
2011 	wrap_page(&tab->window, body_cols);
2012 	if (tab->flags & TAB_CURRENT) {
2013 		restore_cursor(&tab->window);
2014 		redraw_tab(tab);
2015 	}
2016 }
2017 
2018 void
2019 ui_require_input(struct tab *tab, int hide)
2020 {
2021 	/* TODO: hard-switching to another tab is ugly */
2022 	switch_to_tab(tab);
2023 
2024 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2025 	    &ir_history);
2026 	strlcpy(ministate.prompt, "Input required: ",
2027 	    sizeof(ministate.prompt));
2028 	redraw_tab(tab);
2029 }
2030 
2031 void
2032 ui_yornp(const char *prompt, void (*fn)(int, void*), void *data)
2033 {
2034 	size_t len;
2035 
2036 	yornp_cb = fn;
2037 	yornp_data = data;
2038 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2039 	    yornp_abort, NULL);
2040 
2041 	len = sizeof(ministate.prompt);
2042 	strlcpy(ministate.prompt, prompt, len);
2043 	strlcat(ministate.prompt, " (y or n) ", len);
2044 	redraw_tab(current_tab());
2045 }
2046 
2047 void
2048 ui_notify(const char *fmt, ...)
2049 {
2050 	va_list ap;
2051 
2052 	va_start(ap, fmt);
2053 	vmessage(fmt, ap);
2054 	va_end(ap);
2055 }
2056 
2057 void
2058 ui_end(void)
2059 {
2060 	endwin();
2061 }