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Date:: Fri Apr 30 12:39:20 2021 UTC
Message:: added DEFALIAS, q and wq are alias to cmd_kill_telescope
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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'', but it's still missing.
32  *
33  */
34 
35 #include <telescope.h>
36 
37 #include <assert.h>
38 #include <curses.h>
39 #include <event.h>
40 #include <locale.h>
41 #include <signal.h>
42 #include <stdarg.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <unistd.h>
46 
47 #define TAB_CURRENT	0x1
48 
49 #define NEW_TAB_URL	"about:new"
50 
51 static struct event	stdioev, winchev;
52 
53 static void		 load_default_keys(void);
54 static void		 restore_cursor(struct window*);
55 
56 #define CMD(fnname)	static void fnname(struct window *)
57 #define DEFALIAS(s, d)	/* nothing */
58 
59 CMD(cmd_previous_line);
60 CMD(cmd_next_line);
61 CMD(cmd_backward_char);
62 CMD(cmd_forward_char);
63 CMD(cmd_backward_paragraph);
64 CMD(cmd_forward_paragraph);
65 CMD(cmd_move_beginning_of_line);
66 CMD(cmd_move_end_of_line);
67 CMD(cmd_redraw);
68 CMD(cmd_scroll_line_down);
69 CMD(cmd_scroll_line_up);
70 CMD(cmd_scroll_up);
71 CMD(cmd_scroll_down);
72 CMD(cmd_beginning_of_buffer);
73 CMD(cmd_end_of_buffer);
74 
75 CMD(cmd_kill_telescope);
76 DEFALIAS(q, cmd_kill_telescope)
77 DEFALIAS(wq, cmd_kill_telescope)
78 
79 CMD(cmd_push_button);
80 CMD(cmd_push_button_new_tab);
81 CMD(cmd_previous_button);
82 CMD(cmd_next_button);
83 CMD(cmd_previous_page);
84 CMD(cmd_next_page);
85 CMD(cmd_clear_minibuf);
86 CMD(cmd_execute_extended_command);
87 CMD(cmd_tab_close);
88 CMD(cmd_tab_close_other);
89 CMD(cmd_tab_new);
90 CMD(cmd_tab_next);
91 CMD(cmd_tab_previous);
92 CMD(cmd_tab_move);
93 CMD(cmd_tab_move_to);
94 CMD(cmd_load_url);
95 CMD(cmd_load_current_url);
96 CMD(cmd_bookmark_page);
97 CMD(cmd_list_bookmarks);
98 CMD(cmd_toggle_help);
99 
100 CMD(cmd_mini_delete_char);
101 CMD(cmd_mini_delete_backward_char);
102 CMD(cmd_mini_kill_line);
103 CMD(cmd_mini_abort);
104 CMD(cmd_mini_complete_and_exit);
105 CMD(cmd_mini_previous_history_element);
106 CMD(cmd_mini_next_history_element);
107 
108 #include "cmd.gen.h"
109 
110 static void		 global_key_unbound(void);
111 static void		 minibuffer_hist_save_entry(void);
112 static void		 minibuffer_taint_hist(void);
113 static void		 minibuffer_self_insert(void);
114 static void		 eecmd_self_insert(void);
115 static void		 eecmd_select(void);
116 static void		 ir_self_insert(void);
117 static void		 ir_select(void);
118 static void		 lu_self_insert(void);
119 static void		 lu_select(void);
120 static void		 bp_select(void);
121 static void		 yornp_self_insert(void);
122 static void		 yornp_abort(void);
123 
124 static struct vline	*nth_line(struct window*, size_t);
125 static struct tab	*current_tab(void);
126 static struct window	*current_window(void);
127 static int		 readkey(void);
128 static void		 dispatch_stdio(int, short, void*);
129 static void		 handle_clear_minibuf(int, short, void*);
130 static void		 handle_resize(int, short, void*);
131 static int		 wrap_page(struct window*, int);
132 static void		 print_vline(WINDOW*, struct vline*);
133 static void		 redraw_tabline(void);
134 static void		 redraw_window(WINDOW*, int, struct window*);
135 static void		 redraw_help(void);
136 static void		 redraw_body(struct tab*);
137 static void		 redraw_modeline(struct tab*);
138 static void		 redraw_minibuffer(void);
139 static void		 redraw_tab(struct tab*);
140 static void		 emit_help_item(char*, void*);
141 static void		 rec_compute_help(struct kmap*, char*, size_t);
142 static void		 recompute_help(void);
143 static void		 vmessage(const char*, va_list);
144 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
145 static void		 start_loading_anim(struct tab*);
146 static void		 update_loading_anim(int, short, void*);
147 static void		 stop_loading_anim(struct tab*);
148 static void		 load_url_in_tab(struct tab*, const char*);
149 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
150 static void		 exit_minibuffer(void);
151 static void		 switch_to_tab(struct tab*);
152 static struct tab	*new_tab(const char*);
153 static void		 session_new_tab_cb(const char*);
154 static void		 usage(void);
155 
156 static struct { short meta; int key; uint32_t cp; } thiskey;
157 
158 static WINDOW	*tabline, *body, *modeline, *minibuf;
159 static int	 body_lines, body_cols;
160 
161 static WINDOW		*help;
162 static struct window	 helpwin;
163 static int		 help_lines, help_cols;
164 
165 static int		 side_window;
166 
167 static struct event	clminibufev;
168 static struct timeval	clminibufev_timer = { 5, 0 };
169 static struct timeval	loadingev_timer = { 0, 250000 };
170 
171 static uint32_t		 tab_counter;
172 
173 static char	keybuf[64];
174 
175 static void (*yornp_cb)(int, unsigned int);
176 static unsigned int yornp_data;
177 
178 struct kmap global_map,
179 	minibuffer_map,
180 	*current_map,
181 	*base_map;
182 
183 static struct histhead eecmd_history,
184 	ir_history,
185 	lu_history;
186 
187 static int	in_minibuffer;
188 
189 static struct {
190 	char		*curmesg;
191 
192 	char		 prompt[64];
193 	void		 (*donefn)(void);
194 	void		 (*abortfn)(void);
195 
196 	char		 buf[1025];
197 	struct line	 line;
198 	struct vline	 vline;
199 	struct window	 window;
200 
201 	struct histhead	*history;
202 	struct hist	*hist_cur;
203 	size_t		 hist_off;
204 } ministate;
205 
206 struct lineprefix {
207 	const char	*prfx1;
208 	const char	*prfx2;
209 } line_prefixes[] = {
210 	[LINE_TEXT] =		{ "",		"" },
211 	[LINE_LINK] =		{ "=> ",	"   " },
212 	[LINE_TITLE_1] =	{ "# ",		"  " },
213 	[LINE_TITLE_2] =	{ "## ",	"   " },
214 	[LINE_TITLE_3] =	{ "### ",	"    " },
215 	[LINE_ITEM] =		{ "* ",		"  " },
216 	[LINE_QUOTE] =		{ "> ",		"  " },
217 	[LINE_PRE_START] =	{ "```",	"   " },
218 	[LINE_PRE_CONTENT] =	{ "",		"" },
219 	[LINE_PRE_END] =	{ "```",	"```" },
220 };
221 
222 static struct line_face {
223 	int prefix_prop;
224 	int text_prop;
225 } line_faces[] = {
226 	[LINE_TEXT] =		{ 0,		0 },
227 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
228 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
229 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
230 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
231 	[LINE_ITEM] =		{ 0,		0 },
232 	[LINE_QUOTE] =		{ 0,		A_DIM },
233 	[LINE_PRE_START] =	{ 0,		0 },
234 	[LINE_PRE_CONTENT] =	{ 0,		0 },
235 	[LINE_PRE_END] =	{ 0,		0 },
236 };
237 
238 static struct tab_face {
239 	int background, tab, current_tab;
240 } tab_face = {
241 	A_REVERSE, A_REVERSE, A_NORMAL
242 };
243 
244 static inline void
245 global_set_key(const char *key, void (*fn)(struct window*))
246 {
247 	if (!kmap_define_key(&global_map, key, fn))
248 		_exit(1);
249 }
250 
251 static inline void
252 minibuffer_set_key(const char *key, void (*fn)(struct window*))
253 {
254 	if (!kmap_define_key(&minibuffer_map, key, fn))
255 		_exit(1);
256 }
257 
258 static void
259 load_default_keys(void)
260 {
261 	/* === global map === */
262 
263 	/* emacs */
264 	global_set_key("C-p",		cmd_previous_line);
265 	global_set_key("C-n",		cmd_next_line);
266 	global_set_key("C-f",		cmd_forward_char);
267 	global_set_key("C-b",		cmd_backward_char);
268 	global_set_key("M-{",		cmd_backward_paragraph);
269 	global_set_key("M-}",		cmd_forward_paragraph);
270 	global_set_key("C-a",		cmd_move_beginning_of_line);
271 	global_set_key("C-e",		cmd_move_end_of_line);
272 
273 	global_set_key("M-v",		cmd_scroll_up);
274 	global_set_key("C-v",		cmd_scroll_down);
275 	global_set_key("M-space",	cmd_scroll_up);
276 	global_set_key("space",		cmd_scroll_down);
277 
278 	global_set_key("M-<",		cmd_beginning_of_buffer);
279 	global_set_key("M->",		cmd_end_of_buffer);
280 
281 	global_set_key("C-x C-c",	cmd_kill_telescope);
282 
283 	global_set_key("C-g",		cmd_clear_minibuf);
284 
285 	global_set_key("M-x",		cmd_execute_extended_command);
286 	global_set_key("C-x C-f",	cmd_load_url);
287 	global_set_key("C-x M-f",	cmd_load_current_url);
288 
289 	global_set_key("C-x t 0",	cmd_tab_close);
290 	global_set_key("C-x t 1",	cmd_tab_close_other);
291 	global_set_key("C-x t 2",	cmd_tab_new);
292 	global_set_key("C-x t o",	cmd_tab_next);
293 	global_set_key("C-x t O",	cmd_tab_previous);
294 	global_set_key("C-x t m",	cmd_tab_move);
295 	global_set_key("C-x t M",	cmd_tab_move_to);
296 
297 	global_set_key("C-M-b",		cmd_previous_page);
298 	global_set_key("C-M-f",		cmd_next_page);
299 
300 	global_set_key("<f7> a",	cmd_bookmark_page);
301 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
302 
303 	/* vi/vi-like */
304 	global_set_key("k",		cmd_previous_line);
305 	global_set_key("j",		cmd_next_line);
306 	global_set_key("l",		cmd_forward_char);
307 	global_set_key("h",		cmd_backward_char);
308 	global_set_key("{",		cmd_backward_paragraph);
309 	global_set_key("}",		cmd_forward_paragraph);
310 	global_set_key("^",		cmd_move_beginning_of_line);
311 	global_set_key("$",		cmd_move_end_of_line);
312 
313 	global_set_key("K",		cmd_scroll_line_up);
314 	global_set_key("J",		cmd_scroll_line_down);
315 
316 	global_set_key("g g",		cmd_beginning_of_buffer);
317 	global_set_key("G",		cmd_end_of_buffer);
318 
319 	global_set_key("g D",		cmd_tab_close);
320 	global_set_key("g N",		cmd_tab_new);
321 	global_set_key("g t",		cmd_tab_next);
322 	global_set_key("g T",		cmd_tab_previous);
323 	global_set_key("g M-t",		cmd_tab_move);
324 	global_set_key("g M-T",		cmd_tab_move_to);
325 
326 	global_set_key("H",		cmd_previous_page);
327 	global_set_key("L",		cmd_next_page);
328 
329 	/* tmp */
330 	global_set_key("q",		cmd_kill_telescope);
331 
332 	global_set_key("esc",		cmd_clear_minibuf);
333 
334 	global_set_key(":",		cmd_execute_extended_command);
335 
336 	/* cua */
337 	global_set_key("<up>",		cmd_previous_line);
338 	global_set_key("<down>",	cmd_next_line);
339 	global_set_key("<right>",	cmd_forward_char);
340 	global_set_key("<left>",	cmd_backward_char);
341 	global_set_key("<prior>",	cmd_scroll_up);
342 	global_set_key("<next>",	cmd_scroll_down);
343 
344 	global_set_key("M-<left>",	cmd_previous_page);
345 	global_set_key("M-<right>",	cmd_next_page);
346 
347 	/* "ncurses standard" */
348 	global_set_key("C-l",		cmd_redraw);
349 
350 	/* global */
351 	global_set_key("<f1>",		cmd_toggle_help);
352 	global_set_key("C-m",		cmd_push_button);
353 	global_set_key("M-enter",	cmd_push_button_new_tab);
354 	global_set_key("M-tab",		cmd_previous_button);
355 	global_set_key("tab",		cmd_next_button);
356 
357 	/* === minibuffer map === */
358 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
359 	minibuffer_set_key("C-g",		cmd_mini_abort);
360 	minibuffer_set_key("esc",		cmd_mini_abort);
361 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
362 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
363 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
364 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
365 
366 	minibuffer_set_key("C-b",		cmd_backward_char);
367 	minibuffer_set_key("C-f",		cmd_forward_char);
368 	minibuffer_set_key("<left>",		cmd_backward_char);
369 	minibuffer_set_key("<right>",		cmd_forward_char);
370 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
371 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
372 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
373 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
374 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
375 
376 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
377 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
378 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
379 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
380 }
381 
382 static void
383 restore_cursor(struct window *window)
384 {
385 	struct vline	*vl;
386 	const char	*prfx;
387 
388 	vl = window->current_line;
389 	if (vl == NULL || vl->line == NULL)
390 		window->curs_x = window->cpoff = 0;
391 	else
392 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
393 
394 	if (vl != NULL) {
395 		prfx = line_prefixes[vl->parent->type].prfx1;
396 		window->curs_x += utf8_swidth(prfx);
397 	}
398 }
399 
400 static void
401 cmd_previous_line(struct window *window)
402 {
403 	struct vline	*vl;
404 
405 	if (window->current_line == NULL
406 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
407 		return;
408 
409 	if (--window->curs_y < 0) {
410 		window->curs_y = 0;
411 		cmd_scroll_line_up(window);
412 		return;
413 	}
414 
415 	window->current_line = vl;
416 	restore_cursor(window);
417 }
418 
419 static void
420 cmd_next_line(struct window *window)
421 {
422 	struct vline	*vl;
423 
424 	if (window->current_line == NULL
425 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
426 		return;
427 
428 	if (++window->curs_y > body_lines-1) {
429 		window->curs_y = body_lines-1;
430 		cmd_scroll_line_down(window);
431 		return;
432 	}
433 
434 	window->current_line = vl;
435 	restore_cursor(window);
436 }
437 
438 static void
439 cmd_backward_char(struct window *window)
440 {
441 	if (window->cpoff != 0)
442 		window->cpoff--;
443 	restore_cursor(window);
444 }
445 
446 static void
447 cmd_forward_char(struct window *window)
448 {
449 	window->cpoff++;
450 	restore_cursor(window);
451 }
452 
453 static void
454 cmd_backward_paragraph(struct window *window)
455 {
456 	do {
457 		if (window->current_line == NULL ||
458 		    window->current_line == TAILQ_FIRST(&window->head)) {
459 			message("No previous paragraph");
460 			return;
461 		}
462 		cmd_previous_line(window);
463 	} while (window->current_line->line != NULL ||
464 	    window->current_line->parent->type != LINE_TEXT);
465 }
466 
467 static void
468 cmd_forward_paragraph(struct window *window)
469 {
470 	do {
471 		if (window->current_line == NULL ||
472 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
473 			message("No next paragraph");
474 			return;
475 		}
476 		cmd_next_line(window);
477 	} while (window->current_line->line != NULL ||
478 	    window->current_line->parent->type != LINE_TEXT);
479 }
480 
481 static void
482 cmd_move_beginning_of_line(struct window *window)
483 {
484 	window->cpoff = 0;
485 	restore_cursor(window);
486 }
487 
488 static void
489 cmd_move_end_of_line(struct window *window)
490 {
491 	struct vline	*vl;
492 
493 	vl = window->current_line;
494 	if (vl->line == NULL)
495 		return;
496 	window->cpoff = utf8_cplen(vl->line);
497 	restore_cursor(window);
498 }
499 
500 static void
501 cmd_redraw(struct window *window)
502 {
503 	handle_resize(0, 0, NULL);
504 }
505 
506 static void
507 cmd_scroll_line_up(struct window *window)
508 {
509 	struct vline	*vl;
510 
511 	if (window->line_off == 0)
512 		return;
513 
514 	vl = nth_line(window, --window->line_off);
515 	wscrl(body, -1);
516 	wmove(body, 0, 0);
517 	print_vline(body, vl);
518 
519 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
520 	restore_cursor(window);
521 }
522 
523 static void
524 cmd_scroll_line_down(struct window *window)
525 {
526 	struct vline	*vl;
527 
528 	vl = window->current_line;
529 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
530 		return;
531 	window->current_line = vl;
532 
533 	window->line_off++;
534 	wscrl(body, 1);
535 
536 	if (window->line_max - window->line_off < (size_t)body_lines)
537 		return;
538 
539 	vl = nth_line(window, window->line_off + body_lines-1);
540 	wmove(body, body_lines-1, 0);
541 	print_vline(body, vl);
542 
543 	restore_cursor(window);
544 }
545 
546 static void
547 cmd_scroll_up(struct window *window)
548 {
549 	size_t off;
550 
551 	off = body_lines-1;
552 
553 	for (; off > 0; --off)
554 		cmd_scroll_line_up(window);
555 }
556 
557 static void
558 cmd_scroll_down(struct window *window)
559 {
560 	size_t off;
561 
562 	off = body_lines-1;
563 
564 	for (; off > 0; --off)
565 		cmd_scroll_line_down(window);
566 }
567 
568 static void
569 cmd_beginning_of_buffer(struct window *window)
570 {
571 	window->current_line = TAILQ_FIRST(&window->head);
572 	window->line_off = 0;
573 	window->curs_y = 0;
574 	window->cpoff = 0;
575 	restore_cursor(window);
576 }
577 
578 static void
579 cmd_end_of_buffer(struct window *window)
580 {
581 	ssize_t off;
582 
583 	off = window->line_max - body_lines;
584 	off = MAX(0, off);
585 
586 	window->line_off = off;
587 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
588 
589 	window->current_line = TAILQ_LAST(&window->head, vhead);
590 	window->cpoff = body_cols;
591 	restore_cursor(window);
592 }
593 
594 static void
595 cmd_kill_telescope(struct window *window)
596 {
597 	save_session();
598 	event_loopbreak();
599 }
600 
601 static void
602 cmd_push_button(struct window *window)
603 {
604 	struct vline	*vl;
605 	size_t		 nth;
606 
607 	nth = window->line_off + window->curs_y;
608 	if (nth >= window->line_max)
609 		return;
610 	vl = nth_line(window, nth);
611 	if (vl->parent->type != LINE_LINK)
612 		return;
613 
614 	load_url_in_tab(current_tab(), vl->parent->alt);
615 }
616 
617 static void
618 cmd_push_button_new_tab(struct window *window)
619 {
620 	struct vline	*vl;
621 	size_t		 nth;
622 
623 	nth = window->line_off + window->curs_y;
624 	if (nth > window->line_max)
625 		return;
626 	vl = nth_line(window, nth);
627 	if (vl->parent->type != LINE_LINK)
628 		return;
629 
630 	new_tab(vl->parent->alt);
631 }
632 
633 static void
634 cmd_previous_button(struct window *window)
635 {
636 	do {
637 		if (window->current_line == NULL ||
638 		    window->current_line == TAILQ_FIRST(&window->head)) {
639 			message("No previous link");
640 			return;
641 		}
642 		cmd_previous_line(window);
643 	} while (window->current_line->parent->type != LINE_LINK);
644 }
645 
646 static void
647 cmd_next_button(struct window *window)
648 {
649 	do {
650 		if (window->current_line == NULL ||
651 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
652 			message("No next link");
653 			return;
654 		}
655 		cmd_next_line(window);
656 	} while (window->current_line->parent->type != LINE_LINK);
657 }
658 
659 static void
660 cmd_previous_page(struct window *window)
661 {
662 	struct tab *tab = current_tab();
663 
664 	if (!load_previous_page(tab))
665 		message("No previous page");
666 	else
667 		start_loading_anim(tab);
668 }
669 
670 static void
671 cmd_next_page(struct window *window)
672 {
673 	struct tab *tab = current_tab();
674 
675 	if (!load_next_page(tab))
676 		message("No next page");
677 	else
678 		start_loading_anim(tab);
679 }
680 
681 static void
682 cmd_clear_minibuf(struct window *window)
683 {
684 	handle_clear_minibuf(0, 0, NULL);
685 }
686 
687 static void
688 cmd_execute_extended_command(struct window *window)
689 {
690 	size_t	 len;
691 
692 	if (in_minibuffer) {
693 		message("We don't have enable-recursive-minibuffers");
694 		return;
695 	}
696 
697 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
698 	    &eecmd_history);
699 
700 	len = sizeof(ministate.prompt);
701 	strlcpy(ministate.prompt, "", len);
702 
703 	if (thiskey.meta)
704 		strlcat(ministate.prompt, "M-", len);
705 
706 	strlcat(ministate.prompt, keyname(thiskey.key), len);
707 	strlcat(ministate.prompt, " ", len);
708 }
709 
710 static void
711 cmd_tab_close(struct window *window)
712 {
713 	struct tab *tab, *t;
714 
715 	tab = current_tab();
716 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
717 	    TAILQ_NEXT(tab, tabs) == NULL) {
718 		message("Can't close the only tab.");
719 		return;
720 	}
721 
722 	if (evtimer_pending(&tab->loadingev, NULL))
723 		evtimer_del(&tab->loadingev);
724 
725 	stop_tab(tab);
726 
727 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
728 		t = TAILQ_NEXT(tab, tabs);
729 	TAILQ_REMOVE(&tabshead, tab, tabs);
730 	free(tab);
731 
732 	switch_to_tab(t);
733 }
734 
735 static void
736 cmd_tab_close_other(struct window *window)
737 {
738 	struct tab *t, *i;
739 
740 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
741 		if (t->flags & TAB_CURRENT)
742 			continue;
743 
744 		stop_tab(t);
745 		TAILQ_REMOVE(&tabshead, t, tabs);
746 		free(t);
747 	}
748 }
749 
750 static void
751 cmd_tab_new(struct window *window)
752 {
753 	new_tab(NEW_TAB_URL);
754 }
755 
756 static void
757 cmd_tab_next(struct window *window)
758 {
759 	struct tab *tab, *t;
760 
761 	tab = current_tab();
762 	tab->flags &= ~TAB_CURRENT;
763 
764 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
765 		t = TAILQ_FIRST(&tabshead);
766 	t->flags |= TAB_CURRENT;
767 }
768 
769 static void
770 cmd_tab_previous(struct window *window)
771 {
772 	struct tab *tab, *t;
773 
774 	tab = current_tab();
775 	tab->flags &= ~TAB_CURRENT;
776 
777 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
778 		t = TAILQ_LAST(&tabshead, tabshead);
779 	t->flags |= TAB_CURRENT;
780 }
781 
782 static void
783 cmd_tab_move(struct window *window)
784 {
785 	struct tab *tab, *t;
786 
787 	tab = current_tab();
788 	t = TAILQ_NEXT(tab, tabs);
789 	TAILQ_REMOVE(&tabshead, tab, tabs);
790 
791 	if (t == NULL)
792 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
793 	else
794 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
795 }
796 
797 static void
798 cmd_tab_move_to(struct window *window)
799 {
800 	struct tab *tab, *t;
801 
802 	tab = current_tab();
803 	t = TAILQ_PREV(tab, tabshead, tabs);
804 	TAILQ_REMOVE(&tabshead, tab, tabs);
805 
806 	if (t == NULL) {
807 		if (TAILQ_EMPTY(&tabshead))
808 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
809 		else
810 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
811 	} else
812 		TAILQ_INSERT_BEFORE(t, tab, tabs);
813 }
814 
815 static void
816 cmd_load_url(struct window *window)
817 {
818 	if (in_minibuffer) {
819 		message("We don't have enable-recursive-minibuffers");
820 		return;
821 	}
822 
823 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
824 	    &lu_history);
825 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
826 }
827 
828 static void
829 cmd_load_current_url(struct window *window)
830 {
831 	struct tab *tab = current_tab();
832 
833 	if (in_minibuffer) {
834 		message("We don't have enable-recursive-minibuffers");
835 		return;
836 	}
837 
838 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
839 	    &lu_history);
840 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
841 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
842 	ministate.window.cpoff = utf8_cplen(ministate.buf);
843 }
844 
845 static void
846 cmd_bookmark_page(struct window *window)
847 {
848 	struct tab *tab = current_tab();
849 
850 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
851 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
852 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
853 	ministate.window.cpoff = utf8_cplen(ministate.buf);
854 }
855 
856 static void
857 cmd_list_bookmarks(struct window *window)
858 {
859 	load_url_in_tab(current_tab(), "about:bookmarks");
860 }
861 
862 static void
863 cmd_toggle_help(struct window *window)
864 {
865 	side_window = !side_window;
866 	if (side_window)
867 		recompute_help();
868 
869 	/* ugly hack, but otherwise the window doesn't get updated
870 	 * until I call handle_resize a second time (i.e. C-l).  I
871 	 * will be happy to know why something like this is needed. */
872 	handle_resize(0, 0, NULL);
873 	handle_resize(0, 0, NULL);
874 }
875 
876 static void
877 cmd_mini_delete_char(struct window *window)
878 {
879 	char *c, *n;
880 
881 	if (!in_minibuffer) {
882 		message("text is read-only");
883 		return;
884 	}
885 
886 	minibuffer_taint_hist();
887 
888 	c = utf8_nth(window->current_line->line, window->cpoff);
889 	if (*c == '\0')
890 		return;
891 	n = utf8_next_cp(c);
892 
893 	memmove(c, n, strlen(n)+1);
894 }
895 
896 static void
897 cmd_mini_delete_backward_char(struct window *window)
898 {
899 	char *c, *p, *start;
900 
901 	if (!in_minibuffer) {
902 		message("text is read-only");
903 		return;
904 	}
905 
906 	minibuffer_taint_hist();
907 
908 	c = utf8_nth(window->current_line->line, window->cpoff);
909 	start = window->current_line->line;
910 	if (c == start)
911 		return;
912 	p = utf8_prev_cp(c-1, start);
913 
914 	memmove(p, c, strlen(c)+1);
915 	window->cpoff--;
916 }
917 
918 static void
919 cmd_mini_kill_line(struct window *window)
920 {
921 	char *c;
922 
923 	if (!in_minibuffer) {
924 		message("text is read-only");
925 		return;
926 	}
927 
928 	minibuffer_taint_hist();
929 	c = utf8_nth(window->current_line->line, window->cpoff);
930 	*c = '\0';
931 }
932 
933 static void
934 cmd_mini_abort(struct window *window)
935 {
936 	if (!in_minibuffer)
937 		return;
938 
939 	ministate.abortfn();
940 }
941 
942 static void
943 cmd_mini_complete_and_exit(struct window *window)
944 {
945 	if (!in_minibuffer)
946 		return;
947 
948 	minibuffer_taint_hist();
949 	ministate.donefn();
950 }
951 
952 static void
953 cmd_mini_previous_history_element(struct window *window)
954 {
955 	if (ministate.history == NULL) {
956 		message("No history");
957 		return;
958 	}
959 
960 	if (ministate.hist_cur == NULL ||
961 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
962 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
963 		ministate.hist_off = ministate.history->len - 1;
964 		if (ministate.hist_cur == NULL)
965 			message("No prev item");
966 	} else {
967 		ministate.hist_off--;
968 	}
969 
970 	if (ministate.hist_cur != NULL)
971 		window->current_line->line = ministate.hist_cur->h;
972 }
973 
974 static void
975 cmd_mini_next_history_element(struct window *window)
976 {
977 	if (ministate.history == NULL) {
978 		message("No history");
979 		return;
980 	}
981 
982 	if (ministate.hist_cur == NULL ||
983 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
984 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
985 		ministate.hist_off = 0;
986 		if (ministate.hist_cur == NULL)
987 			message("No next item");
988 	} else {
989 		ministate.hist_off++;
990 	}
991 
992 	if (ministate.hist_cur != NULL)
993 		window->current_line->line = ministate.hist_cur->h;
994 }
995 
996 static void
997 global_key_unbound(void)
998 {
999 	message("%s is undefined", keybuf);
1000 }
1001 
1002 static void
1003 minibuffer_hist_save_entry(void)
1004 {
1005 	struct hist	*hist;
1006 
1007 	if (ministate.history == NULL)
1008 		return;
1009 
1010 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1011 		abort();
1012 
1013 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1014 
1015 	if (TAILQ_EMPTY(&ministate.history->head))
1016 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1017 	else
1018 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1019 	ministate.history->len++;
1020 }
1021 
1022 /*
1023  * taint the minibuffer cache: if we're currently showing a history
1024  * element, copy that to the current buf and reset the "history
1025  * navigation" thing.
1026  */
1027 static void
1028 minibuffer_taint_hist(void)
1029 {
1030 	if (ministate.hist_cur == NULL)
1031 		return;
1032 
1033 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1034 	ministate.hist_cur = NULL;
1035 }
1036 
1037 static void
1038 minibuffer_self_insert(void)
1039 {
1040 	char	*c, tmp[5] = {0};
1041 	size_t	len;
1042 
1043 	minibuffer_taint_hist();
1044 
1045 	if (thiskey.cp == 0)
1046 		return;
1047 
1048 	len = utf8_encode(thiskey.cp, tmp);
1049 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1050 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1051 		return;
1052 
1053 	memmove(c + len, c, strlen(c)+1);
1054 	memcpy(c, tmp, len);
1055 	ministate.window.cpoff++;
1056 }
1057 
1058 static void
1059 eecmd_self_insert(void)
1060 {
1061 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1062 	    !unicode_isgraph(thiskey.cp)) {
1063 		global_key_unbound();
1064 		return;
1065 	}
1066 
1067 	minibuffer_self_insert();
1068 }
1069 
1070 static void
1071 eecmd_select(void)
1072 {
1073 	struct cmds *cmd;
1074 
1075 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1076 		if (!strcmp(cmd->cmd, ministate.buf)) {
1077 			exit_minibuffer();
1078 			minibuffer_hist_save_entry();
1079 			cmd->fn(current_window());
1080 			return;
1081 		}
1082 	}
1083 
1084 	message("No match");
1085 }
1086 
1087 static void
1088 ir_self_insert(void)
1089 {
1090 	minibuffer_self_insert();
1091 }
1092 
1093 static void
1094 ir_select(void)
1095 {
1096 	char		 buf[1025] = {0};
1097 	struct phos_uri	 uri;
1098 	struct tab	*tab;
1099 
1100 	tab = current_tab();
1101 
1102 	exit_minibuffer();
1103 	minibuffer_hist_save_entry();
1104 
1105 	/* a bit ugly but... */
1106 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1107 	phos_uri_set_query(&uri, ministate.buf);
1108 	phos_serialize_uri(&uri, buf, sizeof(buf));
1109 	load_url_in_tab(tab, buf);
1110 }
1111 
1112 static void
1113 lu_self_insert(void)
1114 {
1115 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1116 	    !unicode_isgraph(thiskey.key)) {
1117 		global_key_unbound();
1118 		return;
1119 	}
1120 
1121 	minibuffer_self_insert();
1122 }
1123 
1124 static void
1125 lu_select(void)
1126 {
1127 	exit_minibuffer();
1128 	minibuffer_hist_save_entry();
1129 	load_url_in_tab(current_tab(), ministate.buf);
1130 }
1131 
1132 static void
1133 bp_select(void)
1134 {
1135 	exit_minibuffer();
1136 	if (*ministate.buf != '\0')
1137 		add_to_bookmarks(ministate.buf);
1138 	else
1139 		message("Abort.");
1140 }
1141 
1142 static void
1143 yornp_self_insert(void)
1144 {
1145 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1146 		message("Please answer y or n");
1147 		return;
1148 	}
1149 
1150 	exit_minibuffer();
1151 	yornp_cb(thiskey.key == 'y', yornp_data);
1152 }
1153 
1154 static void
1155 yornp_abort(void)
1156 {
1157 	exit_minibuffer();
1158 	yornp_cb(0, yornp_data);
1159 }
1160 
1161 static struct vline *
1162 nth_line(struct window *window, size_t n)
1163 {
1164 	struct vline	*vl;
1165 	size_t		 i;
1166 
1167 	i = 0;
1168 	TAILQ_FOREACH(vl, &window->head, vlines) {
1169 		if (i == n)
1170 			return vl;
1171 		i++;
1172 	}
1173 
1174 	/* unreachable */
1175 	abort();
1176 }
1177 
1178 static struct tab *
1179 current_tab(void)
1180 {
1181 	struct tab *t;
1182 
1183 	TAILQ_FOREACH(t, &tabshead, tabs) {
1184 		if (t->flags & TAB_CURRENT)
1185 			return t;
1186 	}
1187 
1188 	/* unreachable */
1189 	abort();
1190 }
1191 
1192 static struct window *
1193 current_window(void)
1194 {
1195 	if (in_minibuffer)
1196 		return &ministate.window;
1197 	return &current_tab()->window;
1198 }
1199 
1200 static int
1201 readkey(void)
1202 {
1203 	uint32_t state = 0;
1204 
1205 	if ((thiskey.key = wgetch(body)) == ERR)
1206 		return 0;
1207 
1208 	thiskey.meta = thiskey.key == 27;
1209 	if (thiskey.meta) {
1210 		thiskey.key = wgetch(body);
1211 		if (thiskey.key == ERR || thiskey.key == 27) {
1212 			thiskey.meta = 0;
1213 			thiskey.key = 27;
1214 		}
1215 	}
1216 
1217 	thiskey.cp = 0;
1218 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1219 		while (1) {
1220 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1221 				break;
1222 			if ((thiskey.key = wgetch(body)) == ERR) {
1223 				message("Error decoding user input");
1224 				return 0;
1225 			}
1226 		}
1227 	}
1228 
1229 	return 1;
1230 }
1231 
1232 static void
1233 dispatch_stdio(int fd, short ev, void *d)
1234 {
1235 	struct keymap	*k;
1236 	const char	*keyname;
1237 	char		 tmp[5] = {0};
1238 
1239 	if (!readkey())
1240 		return;
1241 
1242 	if (keybuf[0] != '\0')
1243 		strlcat(keybuf, " ", sizeof(keybuf));
1244 	if (thiskey.meta)
1245 		strlcat(keybuf, "M-", sizeof(keybuf));
1246 	if (thiskey.cp != 0) {
1247 		utf8_encode(thiskey.cp, tmp);
1248 		strlcat(keybuf, tmp, sizeof(keybuf));
1249 	} else {
1250 		if ((keyname = unkbd(thiskey.key)) != NULL)
1251 			strlcat(keybuf, keyname, sizeof(keybuf));
1252 		else {
1253 			tmp[0] = thiskey.key;
1254 			strlcat(keybuf, tmp, sizeof(keybuf));
1255 		}
1256 	}
1257 
1258 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1259 		if (k->meta == thiskey.meta &&
1260 		    k->key == thiskey.key) {
1261 			if (k->fn == NULL)
1262 				current_map = &k->map;
1263 			else {
1264 				current_map = base_map;
1265 				strlcpy(keybuf, "", sizeof(keybuf));
1266 				k->fn(current_window());
1267 			}
1268 			goto done;
1269 		}
1270 	}
1271 
1272 	if (current_map->unhandled_input != NULL)
1273 		current_map->unhandled_input();
1274 	else {
1275 		global_key_unbound();
1276 	}
1277 
1278 	strlcpy(keybuf, "", sizeof(keybuf));
1279 	current_map = base_map;
1280 
1281 done:
1282 	if (side_window)
1283 		recompute_help();
1284 
1285 	redraw_tab(current_tab());
1286 }
1287 
1288 static void
1289 handle_clear_minibuf(int fd, short ev, void *d)
1290 {
1291 	free(ministate.curmesg);
1292 	ministate.curmesg = NULL;
1293 
1294 	redraw_minibuffer();
1295 	if (in_minibuffer) {
1296 		wrefresh(body);
1297 		wrefresh(minibuf);
1298 	} else {
1299 		wrefresh(minibuf);
1300 		wrefresh(body);
1301 	}
1302 }
1303 
1304 static void
1305 handle_resize(int sig, short ev, void *d)
1306 {
1307 	struct tab	*tab;
1308 
1309 	endwin();
1310 	refresh();
1311 	clear();
1312 
1313 	/* move and resize the windows, in reverse order! */
1314 
1315 	mvwin(minibuf, LINES-1, 0);
1316 	wresize(minibuf, 1, COLS);
1317 
1318 	mvwin(modeline, LINES-2, 0);
1319 	wresize(modeline, 1, COLS);
1320 
1321 	body_lines = LINES-3;
1322 	body_cols = COLS;
1323 
1324 	if (side_window) {
1325 		help_cols = 0.3 * COLS;
1326 		help_lines = LINES-3;
1327 		mvwin(help, 1, 0);
1328 		wresize(help, help_lines, help_cols);
1329 
1330 		wrap_page(&helpwin, help_cols);
1331 
1332 		body_cols = COLS - help_cols - 1;
1333 		mvwin(body, 1, help_cols);
1334 	} else
1335 		mvwin(body, 1, 0);
1336 
1337 	wresize(body, body_lines, body_cols);
1338 
1339 	wresize(tabline, 1, COLS);
1340 
1341 	tab = current_tab();
1342 
1343 	wrap_page(&tab->window, body_cols);
1344 	redraw_tab(tab);
1345 }
1346 
1347 static int
1348 wrap_page(struct window *window, int width)
1349 {
1350 	struct line		*l;
1351 	const struct line	*orig;
1352 	struct vline		*vl;
1353 	const char		*prfx;
1354 
1355 	orig = window->current_line == NULL
1356 		? NULL
1357 		: window->current_line->parent;
1358 	window->current_line = NULL;
1359 
1360 	window->curs_y = 0;
1361 	window->line_off = 0;
1362 
1363 	empty_vlist(window);
1364 
1365 	TAILQ_FOREACH(l, &window->page.head, lines) {
1366 		prfx = line_prefixes[l->type].prfx1;
1367 		switch (l->type) {
1368 		case LINE_TEXT:
1369 		case LINE_LINK:
1370 		case LINE_TITLE_1:
1371 		case LINE_TITLE_2:
1372 		case LINE_TITLE_3:
1373 		case LINE_ITEM:
1374 		case LINE_QUOTE:
1375 		case LINE_PRE_START:
1376 		case LINE_PRE_END:
1377 			wrap_text(window, prfx, l, width);
1378 			break;
1379 		case LINE_PRE_CONTENT:
1380                         hardwrap_text(window, l, width);
1381 			break;
1382 		}
1383 
1384 		if (orig == l && window->current_line == NULL) {
1385 			window->line_off = window->line_max-1;
1386 			window->current_line = TAILQ_LAST(&window->head, vhead);
1387 
1388 			while (1) {
1389 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1390 				if (vl == NULL || vl->parent != orig)
1391 					break;
1392 				window->current_line = vl;
1393 				window->line_off--;
1394 			}
1395 		}
1396 	}
1397 
1398         if (window->current_line == NULL)
1399 		window->current_line = TAILQ_FIRST(&window->head);
1400 
1401 	return 1;
1402 }
1403 
1404 static void
1405 print_vline(WINDOW *window, struct vline *vl)
1406 {
1407 	const char *text = vl->line;
1408 	const char *prfx;
1409 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1410 	int text_face = line_faces[vl->parent->type].text_prop;
1411 
1412 	if (!vl->flags)
1413 		prfx = line_prefixes[vl->parent->type].prfx1;
1414 	else
1415 		prfx = line_prefixes[vl->parent->type].prfx2;
1416 
1417 	if (text == NULL)
1418 		text = "";
1419 
1420 	wattron(window, prefix_face);
1421 	wprintw(window, "%s", prfx);
1422 	wattroff(window, prefix_face);
1423 
1424 	wattron(window, text_face);
1425 	wprintw(window, "%s", text);
1426 	wattroff(window, text_face);
1427 }
1428 
1429 static void
1430 redraw_tabline(void)
1431 {
1432 	struct tab	*tab;
1433 	size_t		 toskip, ots, tabwidth, space, x;
1434 	int		 current, y, truncated;
1435 	const char	*title;
1436 	char		 buf[25];
1437 
1438 	tabwidth = sizeof(buf)+1;
1439 	space = COLS-2;
1440 
1441 	toskip = 0;
1442 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1443 		toskip++;
1444 		if (tab->flags & TAB_CURRENT)
1445 			break;
1446 	}
1447 
1448 	if (toskip * tabwidth < space)
1449 		toskip = 0;
1450 	else {
1451 		ots = toskip;
1452 		toskip--;
1453                 while (toskip != 0 &&
1454 		    (ots - toskip+1) * tabwidth < space)
1455 			toskip--;
1456 	}
1457 
1458 	werase(tabline);
1459 	wattron(tabline, tab_face.background);
1460 	wprintw(tabline, toskip == 0 ? " " : "<");
1461 	wattroff(tabline, tab_face.background);
1462 
1463 	truncated = 0;
1464 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1465 		if (truncated)
1466 			break;
1467 		if (toskip != 0) {
1468 			toskip--;
1469 			continue;
1470 		}
1471 
1472 		getyx(tabline, y, x);
1473 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1474 			truncated = 1;
1475 
1476 		current = tab->flags & TAB_CURRENT;
1477 
1478 		if (*(title = tab->window.page.title) == '\0')
1479 			title = tab->hist_cur->h;
1480 
1481 		strlcpy(buf, " ", sizeof(buf));
1482                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1483 			/* truncation happens */
1484 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1485 		} else {
1486 			/* pad with spaces */
1487 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1488 				/* nop */ ;
1489 		}
1490 
1491 		if (current)
1492 			wattron(tabline, tab_face.current_tab);
1493 		else
1494 			wattron(tabline, tab_face.tab);
1495 
1496 		wprintw(tabline, "%s", buf);
1497 		if (TAILQ_NEXT(tab, tabs) != NULL)
1498 			wprintw(tabline, " ");
1499 
1500 		if (current)
1501 			wattroff(tabline, tab_face.current_tab);
1502 		else
1503 			wattroff(tabline, tab_face.tab);
1504 	}
1505 
1506 	wattron(tabline, tab_face.background);
1507 	for (; x < (size_t)COLS; ++x)
1508 		waddch(tabline, ' ');
1509 	if (truncated)
1510 		mvwprintw(tabline, 0, COLS-1, ">");
1511 }
1512 
1513 static void
1514 redraw_window(WINDOW *win, int height, struct window *window)
1515 {
1516 	struct vline	*vl;
1517 	int		 l;
1518 
1519 	werase(win);
1520 
1521 	window->line_off = MIN(window->line_max-1, window->line_off);
1522 	if (TAILQ_EMPTY(&window->head))
1523 		return;
1524 
1525 	l = 0;
1526 	vl = nth_line(window, window->line_off);
1527 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1528 		wmove(win, l, 0);
1529 		print_vline(win, vl);
1530 		l++;
1531 		if (l == height)
1532 			break;
1533 	}
1534 
1535 	wmove(win, window->curs_y, window->curs_x);
1536 }
1537 
1538 static void
1539 redraw_help(void)
1540 {
1541 	redraw_window(help, help_lines, &helpwin);
1542 }
1543 
1544 static void
1545 redraw_body(struct tab *tab)
1546 {
1547 	redraw_window(body, body_lines, &tab->window);
1548 }
1549 
1550 static inline char
1551 trust_status_char(enum trust_state ts)
1552 {
1553 	switch (ts) {
1554 	case TS_UNKNOWN:	return 'u';
1555 	case TS_UNTRUSTED:	return '!';
1556 	case TS_TRUSTED:	return 'v';
1557 	case TS_VERIFIED:	return 'V';
1558 	}
1559 }
1560 
1561 static void
1562 redraw_modeline(struct tab *tab)
1563 {
1564 	double		 pct;
1565 	int		 x, y, max_x, max_y;
1566 	const char	*mode = tab->window.page.name;
1567 	const char	*spin = "-\\|/";
1568 
1569 	werase(modeline);
1570 	wattron(modeline, A_REVERSE);
1571 	wmove(modeline, 0, 0);
1572 
1573 	wprintw(modeline, "-%c%c %s ",
1574 	    spin[tab->loading_anim_step],
1575 	    trust_status_char(tab->trust),
1576 	    mode == NULL ? "(none)" : mode);
1577 
1578 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1579 
1580 	if (tab->window.line_max <= (size_t)body_lines)
1581                 wprintw(modeline, "All ");
1582 	else if (tab->window.line_off == 0)
1583                 wprintw(modeline, "Top ");
1584 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1585 		wprintw(modeline, "Bottom ");
1586 	else
1587 		wprintw(modeline, "%.0f%% ", pct);
1588 
1589 	wprintw(modeline, "%d/%d %s ",
1590 	    tab->window.line_off + tab->window.curs_y,
1591 	    tab->window.line_max,
1592 	    tab->hist_cur->h);
1593 
1594 	getyx(modeline, y, x);
1595 	getmaxyx(modeline, max_y, max_x);
1596 
1597 	(void)y;
1598 	(void)max_y;
1599 
1600 	for (; x < max_x; ++x)
1601 		waddstr(modeline, "-");
1602 }
1603 
1604 static void
1605 redraw_minibuffer(void)
1606 {
1607 	struct tab *tab;
1608 	size_t off_y, off_x = 0;
1609 	char *start, *c;
1610 
1611 	werase(minibuf);
1612 
1613 	if (in_minibuffer) {
1614 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1615 		if (ministate.hist_cur != NULL)
1616 			wprintw(minibuf, "(%zu/%zu) ",
1617 			    ministate.hist_off + 1,
1618 			    ministate.history->len);
1619 
1620 		getyx(minibuf, off_y, off_x);
1621 
1622 		start = ministate.hist_cur != NULL
1623 			? ministate.hist_cur->h
1624 			: ministate.buf;
1625 		c = utf8_nth(ministate.window.current_line->line,
1626 		    ministate.window.cpoff);
1627 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1628 			start = utf8_next_cp(start);
1629 		}
1630 
1631 		waddstr(minibuf, start);
1632 	}
1633 
1634 	if (ministate.curmesg != NULL)
1635                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1636 		    ministate.curmesg);
1637 
1638 	if (!in_minibuffer && ministate.curmesg == NULL)
1639 		waddstr(minibuf, keybuf);
1640 
1641 	/* If nothing else, show the URL at point */
1642 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1643 		tab = current_tab();
1644 		if (tab->window.current_line != NULL &&
1645 		    tab->window.current_line->parent->type == LINE_LINK)
1646 			waddstr(minibuf, tab->window.current_line->parent->alt);
1647 	}
1648 
1649 	if (in_minibuffer)
1650 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1651 }
1652 
1653 static void
1654 redraw_tab(struct tab *tab)
1655 {
1656 	if (side_window) {
1657 		redraw_help();
1658 		wnoutrefresh(help);
1659 	}
1660 
1661 	redraw_tabline();
1662 	redraw_body(tab);
1663 	redraw_modeline(tab);
1664 	redraw_minibuffer();
1665 
1666 	wnoutrefresh(tabline);
1667 	wnoutrefresh(modeline);
1668 
1669 	if (in_minibuffer) {
1670 		wnoutrefresh(body);
1671 		wnoutrefresh(minibuf);
1672 	} else {
1673 		wnoutrefresh(minibuf);
1674 		wnoutrefresh(body);
1675 	}
1676 
1677 	doupdate();
1678 }
1679 
1680 static void
1681 emit_help_item(char *prfx, void *fn)
1682 {
1683 	struct line	*l;
1684 	struct cmds	*cmd;
1685 
1686 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1687 		if (fn == cmd->fn)
1688 			break;
1689 	}
1690 	assert(cmd != NULL);
1691 
1692 	if ((l = calloc(1, sizeof(*l))) == NULL)
1693 		abort();
1694 
1695 	l->type = LINE_TEXT;
1696 	l->alt = NULL;
1697 
1698 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1699 
1700 	if (TAILQ_EMPTY(&helpwin.page.head))
1701 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1702 	else
1703 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1704 }
1705 
1706 static void
1707 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1708 {
1709 	struct keymap	*k;
1710 	char		 p[32];
1711 	const char	*kn;
1712 
1713 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1714 		strlcpy(p, prfx, sizeof(p));
1715 		if (*p != '\0')
1716 			strlcat(p, " ", sizeof(p));
1717 		if (k->meta)
1718 			strlcat(p, "M-", sizeof(p));
1719 		if ((kn = unkbd(k->key)) != NULL)
1720 			strlcat(p, kn, sizeof(p));
1721 		else
1722 			strlcat(p, keyname(k->key), sizeof(p));
1723 
1724 		if (k->fn == NULL)
1725 			rec_compute_help(&k->map, p, sizeof(p));
1726 		else
1727 			emit_help_item(p, k->fn);
1728 	}
1729 }
1730 
1731 static void
1732 recompute_help(void)
1733 {
1734 	char	p[32] = { 0 };
1735 
1736 	empty_vlist(&helpwin);
1737 	empty_linelist(&helpwin);
1738 	rec_compute_help(current_map, p, sizeof(p));
1739 	wrap_page(&helpwin, help_cols);
1740 }
1741 
1742 static void
1743 vmessage(const char *fmt, va_list ap)
1744 {
1745 	if (evtimer_pending(&clminibufev, NULL))
1746 		evtimer_del(&clminibufev);
1747 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1748 	evtimer_add(&clminibufev, &clminibufev_timer);
1749 
1750 	free(ministate.curmesg);
1751 
1752 	/* TODO: what to do if the allocation fails here? */
1753 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1754 		ministate.curmesg = NULL;
1755 
1756 	redraw_minibuffer();
1757 	if (in_minibuffer) {
1758 		wrefresh(body);
1759 		wrefresh(minibuf);
1760 	} else {
1761 		wrefresh(minibuf);
1762 		wrefresh(body);
1763 	}
1764 }
1765 
1766 static void
1767 message(const char *fmt, ...)
1768 {
1769 	va_list ap;
1770 
1771 	va_start(ap, fmt);
1772 	vmessage(fmt, ap);
1773 	va_end(ap);
1774 }
1775 
1776 static void
1777 start_loading_anim(struct tab *tab)
1778 {
1779 	if (tab->loading_anim)
1780 		return;
1781 	tab->loading_anim = 1;
1782 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1783 	evtimer_add(&tab->loadingev, &loadingev_timer);
1784 }
1785 
1786 static void
1787 update_loading_anim(int fd, short ev, void *d)
1788 {
1789 	struct tab	*tab = d;
1790 
1791 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1792 
1793 	if (tab->flags & TAB_CURRENT) {
1794 		redraw_modeline(tab);
1795 		wrefresh(modeline);
1796 		wrefresh(body);
1797 		if (in_minibuffer)
1798 			wrefresh(minibuf);
1799 	}
1800 
1801 	evtimer_add(&tab->loadingev, &loadingev_timer);
1802 }
1803 
1804 static void
1805 stop_loading_anim(struct tab *tab)
1806 {
1807 	if (!tab->loading_anim)
1808 		return;
1809 	evtimer_del(&tab->loadingev);
1810 	tab->loading_anim = 0;
1811 	tab->loading_anim_step = 0;
1812 
1813 	if (!(tab->flags & TAB_CURRENT))
1814 		return;
1815 
1816 	redraw_modeline(tab);
1817 
1818 	wrefresh(modeline);
1819 	wrefresh(body);
1820 	if (in_minibuffer)
1821 		wrefresh(minibuf);
1822 }
1823 
1824 static void
1825 load_url_in_tab(struct tab *tab, const char *url)
1826 {
1827 	message("Loading %s...", url);
1828 	start_loading_anim(tab);
1829 	load_url(tab, url);
1830 
1831 	tab->window.curs_x = 0;
1832 	tab->window.curs_y = 0;
1833 	redraw_tab(tab);
1834 }
1835 
1836 static void
1837 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1838     void (*abortfn)(void), struct histhead *hist)
1839 {
1840 	in_minibuffer = 1;
1841 	base_map = &minibuffer_map;
1842 	current_map = &minibuffer_map;
1843 
1844 	base_map->unhandled_input = self_insert_fn;
1845 
1846 	ministate.donefn = donefn;
1847 	ministate.abortfn = abortfn;
1848 	memset(ministate.buf, 0, sizeof(ministate.buf));
1849 	ministate.window.current_line = &ministate.vline;
1850 	ministate.window.current_line->line = ministate.buf;
1851 	ministate.window.cpoff = 0;
1852 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1853 
1854 	ministate.history = hist;
1855 	ministate.hist_cur = NULL;
1856 	ministate.hist_off = 0;
1857 }
1858 
1859 static void
1860 exit_minibuffer(void)
1861 {
1862 	werase(minibuf);
1863 
1864 	in_minibuffer = 0;
1865 	base_map = &global_map;
1866 	current_map = &global_map;
1867 }
1868 
1869 static void
1870 switch_to_tab(struct tab *tab)
1871 {
1872 	struct tab	*t;
1873 
1874 	TAILQ_FOREACH(t, &tabshead, tabs) {
1875 		t->flags &= ~TAB_CURRENT;
1876 	}
1877 
1878 	tab->flags |= TAB_CURRENT;
1879 }
1880 
1881 unsigned int
1882 tab_new_id(void)
1883 {
1884 	return tab_counter++;
1885 }
1886 
1887 static struct tab *
1888 new_tab(const char *url)
1889 {
1890 	struct tab	*tab;
1891 
1892 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1893 		event_loopbreak();
1894 		return NULL;
1895 	}
1896 
1897 	TAILQ_INIT(&tab->hist.head);
1898 
1899 	TAILQ_INIT(&tab->window.head);
1900 
1901 	tab->id = tab_new_id();
1902 	switch_to_tab(tab);
1903 
1904 	if (TAILQ_EMPTY(&tabshead))
1905 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1906 	else
1907 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1908 
1909 	load_url_in_tab(tab, url);
1910 	return tab;
1911 }
1912 
1913 static void
1914 session_new_tab_cb(const char *url)
1915 {
1916 	new_tab(url);
1917 }
1918 
1919 static void
1920 usage(void)
1921 {
1922 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1923 }
1924 
1925 int
1926 ui_init(int argc, char * const *argv)
1927 {
1928 	const char *url = NEW_TAB_URL;
1929 	int ch;
1930 
1931 	while ((ch = getopt(argc, argv, "")) != -1) {
1932 		switch (ch) {
1933 		default:
1934 			usage();
1935 			return 0;
1936 		}
1937 	}
1938 	argc -= optind;
1939 	argv += optind;
1940 
1941 	if (argc != 0)
1942 		url = argv[0];
1943 
1944 	setlocale(LC_ALL, "");
1945 
1946 	TAILQ_INIT(&global_map.m);
1947 	global_map.unhandled_input = global_key_unbound;
1948 
1949 	TAILQ_INIT(&minibuffer_map.m);
1950 
1951 	TAILQ_INIT(&eecmd_history.head);
1952 	TAILQ_INIT(&ir_history.head);
1953 	TAILQ_INIT(&lu_history.head);
1954 
1955 	ministate.line.type = LINE_TEXT;
1956 	ministate.vline.parent = &ministate.line;
1957 	ministate.window.current_line = &ministate.vline;
1958 
1959 	/* initialize help window */
1960 	TAILQ_INIT(&helpwin.head);
1961 
1962 	base_map = &global_map;
1963 	current_map = &global_map;
1964 	load_default_keys();
1965 
1966 	initscr();
1967 	raw();
1968 	noecho();
1969 
1970 	nonl();
1971 	intrflush(stdscr, FALSE);
1972 
1973 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1974 		return 0;
1975 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1976 		return 0;
1977 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1978 		return 0;
1979 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1980 		return 0;
1981 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1982 		return 0;
1983 
1984 	body_lines = LINES-3;
1985 	body_cols = COLS;
1986 
1987 	keypad(body, TRUE);
1988 	scrollok(body, TRUE);
1989 
1990 	/* non-blocking input */
1991 	wtimeout(body, 0);
1992 
1993 	mvwprintw(body, 0, 0, "");
1994 
1995 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1996 	event_add(&stdioev, NULL);
1997 
1998 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1999 	signal_add(&winchev, NULL);
2000 
2001 	load_last_session(session_new_tab_cb);
2002 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
2003 		new_tab(url);
2004 
2005 	return 1;
2006 }
2007 
2008 void
2009 ui_on_tab_loaded(struct tab *tab)
2010 {
2011 	stop_loading_anim(tab);
2012 	message("Loaded %s", tab->hist_cur->h);
2013 
2014 	redraw_tabline();
2015 	wrefresh(tabline);
2016 	if (in_minibuffer)
2017 		wrefresh(minibuf);
2018 	else
2019 		wrefresh(body);
2020 }
2021 
2022 void
2023 ui_on_tab_refresh(struct tab *tab)
2024 {
2025 	wrap_page(&tab->window, body_cols);
2026 	if (tab->flags & TAB_CURRENT) {
2027 		restore_cursor(&tab->window);
2028 		redraw_tab(tab);
2029 	}
2030 }
2031 
2032 void
2033 ui_require_input(struct tab *tab, int hide)
2034 {
2035 	/* TODO: hard-switching to another tab is ugly */
2036 	switch_to_tab(tab);
2037 
2038 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2039 	    &ir_history);
2040 	strlcpy(ministate.prompt, "Input required: ",
2041 	    sizeof(ministate.prompt));
2042 	redraw_tab(tab);
2043 }
2044 
2045 void
2046 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2047     unsigned int data)
2048 {
2049 	size_t len;
2050 
2051 	if (in_minibuffer) {
2052 		fn(0, data);
2053 		return;
2054 	}
2055 
2056 	yornp_cb = fn;
2057 	yornp_data = data;
2058 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2059 	    yornp_abort, NULL);
2060 
2061 	len = sizeof(ministate.prompt);
2062 	strlcpy(ministate.prompt, prompt, len);
2063 	strlcat(ministate.prompt, " (y or n) ", len);
2064 	redraw_tab(current_tab());
2065 }
2066 
2067 void
2068 ui_notify(const char *fmt, ...)
2069 {
2070 	va_list ap;
2071 
2072 	va_start(ap, fmt);
2073 	vmessage(fmt, ap);
2074 	va_end(ap);
2075 }
2076 
2077 void
2078 ui_end(void)
2079 {
2080 	endwin();
2081 }