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Date:: Wed May 12 11:18:47 2021 UTC
Message:: debounce resize event
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'', 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 void		 handle_resize_timeout(int, short, void*);
132 static int		 wrap_page(struct window*, int);
133 static void		 print_vline(WINDOW*, struct vline*);
134 static void		 redraw_tabline(void);
135 static void		 redraw_window(WINDOW*, int, struct window*);
136 static void		 redraw_help(void);
137 static void		 redraw_body(struct tab*);
138 static void		 redraw_modeline(struct tab*);
139 static void		 redraw_minibuffer(void);
140 static void		 redraw_tab(struct tab*);
141 static void		 emit_help_item(char*, void*);
142 static void		 rec_compute_help(struct kmap*, char*, size_t);
143 static void		 recompute_help(void);
144 static void		 vmessage(const char*, va_list);
145 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
146 static void		 start_loading_anim(struct tab*);
147 static void		 update_loading_anim(int, short, void*);
148 static void		 stop_loading_anim(struct tab*);
149 static void		 load_url_in_tab(struct tab*, const char*);
150 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
151 static void		 exit_minibuffer(void);
152 static void		 switch_to_tab(struct tab*);
153 static struct tab	*new_tab(const char*);
154 static void		 session_new_tab_cb(const char*);
155 static void		 usage(void);
156 
157 static struct { short meta; int key; uint32_t cp; } thiskey;
158 
159 static struct event	resizeev;
160 static struct timeval	resize_timer = { 0, 250000 };
161 
162 static WINDOW	*tabline, *body, *modeline, *minibuf;
163 static int	 body_lines, body_cols;
164 
165 static WINDOW		*help;
166 static struct window	 helpwin;
167 static int		 help_lines, help_cols;
168 
169 static int		 side_window;
170 
171 static struct event	clminibufev;
172 static struct timeval	clminibufev_timer = { 5, 0 };
173 static struct timeval	loadingev_timer = { 0, 250000 };
174 
175 static uint32_t		 tab_counter;
176 
177 static char	keybuf[64];
178 
179 static void (*yornp_cb)(int, unsigned int);
180 static unsigned int yornp_data;
181 
182 struct kmap global_map,
183 	minibuffer_map,
184 	*current_map,
185 	*base_map;
186 
187 static struct histhead eecmd_history,
188 	ir_history,
189 	lu_history;
190 
191 static int	in_minibuffer;
192 
193 static struct {
194 	char		*curmesg;
195 
196 	char		 prompt[64];
197 	void		 (*donefn)(void);
198 	void		 (*abortfn)(void);
199 
200 	char		 buf[1025];
201 	struct line	 line;
202 	struct vline	 vline;
203 	struct window	 window;
204 
205 	struct histhead	*history;
206 	struct hist	*hist_cur;
207 	size_t		 hist_off;
208 } ministate;
209 
210 struct lineprefix {
211 	const char	*prfx1;
212 	const char	*prfx2;
213 } line_prefixes[] = {
214 	[LINE_TEXT] =		{ "",		"" },
215 	[LINE_LINK] =		{ "=> ",	"   " },
216 	[LINE_TITLE_1] =	{ "# ",		"  " },
217 	[LINE_TITLE_2] =	{ "## ",	"   " },
218 	[LINE_TITLE_3] =	{ "### ",	"    " },
219 	[LINE_ITEM] =		{ "* ",		"  " },
220 	[LINE_QUOTE] =		{ "> ",		"  " },
221 	[LINE_PRE_START] =	{ "```",	"   " },
222 	[LINE_PRE_CONTENT] =	{ "",		"" },
223 	[LINE_PRE_END] =	{ "```",	"```" },
224 };
225 
226 static struct line_face {
227 	int prefix_prop;
228 	int text_prop;
229 } line_faces[] = {
230 	[LINE_TEXT] =		{ 0,		0 },
231 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
232 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
233 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
234 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
235 	[LINE_ITEM] =		{ 0,		0 },
236 	[LINE_QUOTE] =		{ 0,		A_DIM },
237 	[LINE_PRE_START] =	{ 0,		0 },
238 	[LINE_PRE_CONTENT] =	{ 0,		0 },
239 	[LINE_PRE_END] =	{ 0,		0 },
240 };
241 
242 static struct tab_face {
243 	int background, tab, current_tab;
244 } tab_face = {
245 	A_REVERSE, A_REVERSE, A_NORMAL
246 };
247 
248 static inline void
249 global_set_key(const char *key, void (*fn)(struct window*))
250 {
251 	if (!kmap_define_key(&global_map, key, fn))
252 		_exit(1);
253 }
254 
255 static inline void
256 minibuffer_set_key(const char *key, void (*fn)(struct window*))
257 {
258 	if (!kmap_define_key(&minibuffer_map, key, fn))
259 		_exit(1);
260 }
261 
262 static void
263 load_default_keys(void)
264 {
265 	/* === global map === */
266 
267 	/* emacs */
268 	global_set_key("C-p",		cmd_previous_line);
269 	global_set_key("C-n",		cmd_next_line);
270 	global_set_key("C-f",		cmd_forward_char);
271 	global_set_key("C-b",		cmd_backward_char);
272 	global_set_key("M-{",		cmd_backward_paragraph);
273 	global_set_key("M-}",		cmd_forward_paragraph);
274 	global_set_key("C-a",		cmd_move_beginning_of_line);
275 	global_set_key("C-e",		cmd_move_end_of_line);
276 
277 	global_set_key("M-v",		cmd_scroll_up);
278 	global_set_key("C-v",		cmd_scroll_down);
279 	global_set_key("M-space",	cmd_scroll_up);
280 	global_set_key("space",		cmd_scroll_down);
281 
282 	global_set_key("M-<",		cmd_beginning_of_buffer);
283 	global_set_key("M->",		cmd_end_of_buffer);
284 
285 	global_set_key("C-x C-c",	cmd_kill_telescope);
286 
287 	global_set_key("C-g",		cmd_clear_minibuf);
288 
289 	global_set_key("M-x",		cmd_execute_extended_command);
290 	global_set_key("C-x C-f",	cmd_load_url);
291 	global_set_key("C-x M-f",	cmd_load_current_url);
292 
293 	global_set_key("C-x t 0",	cmd_tab_close);
294 	global_set_key("C-x t 1",	cmd_tab_close_other);
295 	global_set_key("C-x t 2",	cmd_tab_new);
296 	global_set_key("C-x t o",	cmd_tab_next);
297 	global_set_key("C-x t O",	cmd_tab_previous);
298 	global_set_key("C-x t m",	cmd_tab_move);
299 	global_set_key("C-x t M",	cmd_tab_move_to);
300 
301 	global_set_key("C-M-b",		cmd_previous_page);
302 	global_set_key("C-M-f",		cmd_next_page);
303 
304 	global_set_key("<f7> a",	cmd_bookmark_page);
305 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
306 
307 	/* vi/vi-like */
308 	global_set_key("k",		cmd_previous_line);
309 	global_set_key("j",		cmd_next_line);
310 	global_set_key("l",		cmd_forward_char);
311 	global_set_key("h",		cmd_backward_char);
312 	global_set_key("{",		cmd_backward_paragraph);
313 	global_set_key("}",		cmd_forward_paragraph);
314 	global_set_key("^",		cmd_move_beginning_of_line);
315 	global_set_key("$",		cmd_move_end_of_line);
316 
317 	global_set_key("K",		cmd_scroll_line_up);
318 	global_set_key("J",		cmd_scroll_line_down);
319 
320 	global_set_key("g g",		cmd_beginning_of_buffer);
321 	global_set_key("G",		cmd_end_of_buffer);
322 
323 	global_set_key("g D",		cmd_tab_close);
324 	global_set_key("g N",		cmd_tab_new);
325 	global_set_key("g t",		cmd_tab_next);
326 	global_set_key("g T",		cmd_tab_previous);
327 	global_set_key("g M-t",		cmd_tab_move);
328 	global_set_key("g M-T",		cmd_tab_move_to);
329 
330 	global_set_key("H",		cmd_previous_page);
331 	global_set_key("L",		cmd_next_page);
332 
333 	/* tmp */
334 	global_set_key("q",		cmd_kill_telescope);
335 
336 	global_set_key("esc",		cmd_clear_minibuf);
337 
338 	global_set_key(":",		cmd_execute_extended_command);
339 
340 	/* cua */
341 	global_set_key("<up>",		cmd_previous_line);
342 	global_set_key("<down>",	cmd_next_line);
343 	global_set_key("<right>",	cmd_forward_char);
344 	global_set_key("<left>",	cmd_backward_char);
345 	global_set_key("<prior>",	cmd_scroll_up);
346 	global_set_key("<next>",	cmd_scroll_down);
347 
348 	global_set_key("M-<left>",	cmd_previous_page);
349 	global_set_key("M-<right>",	cmd_next_page);
350 
351 	/* "ncurses standard" */
352 	global_set_key("C-l",		cmd_redraw);
353 
354 	/* global */
355 	global_set_key("<f1>",		cmd_toggle_help);
356 	global_set_key("C-m",		cmd_push_button);
357 	global_set_key("M-enter",	cmd_push_button_new_tab);
358 	global_set_key("M-tab",		cmd_previous_button);
359 	global_set_key("tab",		cmd_next_button);
360 
361 	/* === minibuffer map === */
362 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
363 	minibuffer_set_key("C-g",		cmd_mini_abort);
364 	minibuffer_set_key("esc",		cmd_mini_abort);
365 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
366 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
367 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
368 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
369 
370 	minibuffer_set_key("C-b",		cmd_backward_char);
371 	minibuffer_set_key("C-f",		cmd_forward_char);
372 	minibuffer_set_key("<left>",		cmd_backward_char);
373 	minibuffer_set_key("<right>",		cmd_forward_char);
374 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
375 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
376 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
377 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
378 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
379 
380 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
381 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
382 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
383 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
384 }
385 
386 static void
387 restore_cursor(struct window *window)
388 {
389 	struct vline	*vl;
390 	const char	*prfx;
391 
392 	vl = window->current_line;
393 	if (vl == NULL || vl->line == NULL)
394 		window->curs_x = window->cpoff = 0;
395 	else
396 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
397 
398 	if (vl != NULL) {
399 		prfx = line_prefixes[vl->parent->type].prfx1;
400 		window->curs_x += utf8_swidth(prfx);
401 	}
402 }
403 
404 static void
405 cmd_previous_line(struct window *window)
406 {
407 	struct vline	*vl;
408 
409 	if (window->current_line == NULL
410 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
411 		return;
412 
413 	if (--window->curs_y < 0) {
414 		window->curs_y = 0;
415 		cmd_scroll_line_up(window);
416 		return;
417 	}
418 
419 	window->current_line = vl;
420 	restore_cursor(window);
421 }
422 
423 static void
424 cmd_next_line(struct window *window)
425 {
426 	struct vline	*vl;
427 
428 	if (window->current_line == NULL
429 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
430 		return;
431 
432 	if (++window->curs_y > body_lines-1) {
433 		window->curs_y = body_lines-1;
434 		cmd_scroll_line_down(window);
435 		return;
436 	}
437 
438 	window->current_line = vl;
439 	restore_cursor(window);
440 }
441 
442 static void
443 cmd_backward_char(struct window *window)
444 {
445 	if (window->cpoff != 0)
446 		window->cpoff--;
447 	restore_cursor(window);
448 }
449 
450 static void
451 cmd_forward_char(struct window *window)
452 {
453 	size_t len;
454 
455 	len = utf8_cplen(ministate.buf);
456 	if (++window->cpoff > len)
457 		window->cpoff = len;
458 	restore_cursor(window);
459 }
460 
461 static void
462 cmd_backward_paragraph(struct window *window)
463 {
464 	do {
465 		if (window->current_line == NULL ||
466 		    window->current_line == TAILQ_FIRST(&window->head)) {
467 			message("No previous paragraph");
468 			return;
469 		}
470 		cmd_previous_line(window);
471 	} while (window->current_line->line != NULL ||
472 	    window->current_line->parent->type != LINE_TEXT);
473 }
474 
475 static void
476 cmd_forward_paragraph(struct window *window)
477 {
478 	do {
479 		if (window->current_line == NULL ||
480 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
481 			message("No next paragraph");
482 			return;
483 		}
484 		cmd_next_line(window);
485 	} while (window->current_line->line != NULL ||
486 	    window->current_line->parent->type != LINE_TEXT);
487 }
488 
489 static void
490 cmd_move_beginning_of_line(struct window *window)
491 {
492 	window->cpoff = 0;
493 	restore_cursor(window);
494 }
495 
496 static void
497 cmd_move_end_of_line(struct window *window)
498 {
499 	struct vline	*vl;
500 
501 	vl = window->current_line;
502 	if (vl->line == NULL)
503 		return;
504 	window->cpoff = utf8_cplen(vl->line);
505 	restore_cursor(window);
506 }
507 
508 static void
509 cmd_redraw(struct window *window)
510 {
511 	handle_resize(0, 0, NULL);
512 }
513 
514 static void
515 cmd_scroll_line_up(struct window *window)
516 {
517 	struct vline	*vl;
518 
519 	if (window->line_off == 0)
520 		return;
521 
522 	vl = nth_line(window, --window->line_off);
523 	wscrl(body, -1);
524 	wmove(body, 0, 0);
525 	print_vline(body, vl);
526 
527 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
528 	restore_cursor(window);
529 }
530 
531 static void
532 cmd_scroll_line_down(struct window *window)
533 {
534 	struct vline	*vl;
535 
536 	vl = window->current_line;
537 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
538 		return;
539 	window->current_line = vl;
540 
541 	window->line_off++;
542 	wscrl(body, 1);
543 
544 	if (window->line_max - window->line_off < (size_t)body_lines)
545 		return;
546 
547 	vl = nth_line(window, window->line_off + body_lines-1);
548 	wmove(body, body_lines-1, 0);
549 	print_vline(body, vl);
550 
551 	restore_cursor(window);
552 }
553 
554 static void
555 cmd_scroll_up(struct window *window)
556 {
557 	size_t off;
558 
559 	off = body_lines-1;
560 
561 	for (; off > 0; --off)
562 		cmd_scroll_line_up(window);
563 }
564 
565 static void
566 cmd_scroll_down(struct window *window)
567 {
568 	size_t off;
569 
570 	off = body_lines-1;
571 
572 	for (; off > 0; --off)
573 		cmd_scroll_line_down(window);
574 }
575 
576 static void
577 cmd_beginning_of_buffer(struct window *window)
578 {
579 	window->current_line = TAILQ_FIRST(&window->head);
580 	window->line_off = 0;
581 	window->curs_y = 0;
582 	window->cpoff = 0;
583 	restore_cursor(window);
584 }
585 
586 static void
587 cmd_end_of_buffer(struct window *window)
588 {
589 	ssize_t off;
590 
591 	off = window->line_max - body_lines;
592 	off = MAX(0, off);
593 
594 	window->line_off = off;
595 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
596 
597 	window->current_line = TAILQ_LAST(&window->head, vhead);
598 	window->cpoff = body_cols;
599 	restore_cursor(window);
600 }
601 
602 static void
603 cmd_kill_telescope(struct window *window)
604 {
605 	save_session();
606 	event_loopbreak();
607 }
608 
609 static void
610 cmd_push_button(struct window *window)
611 {
612 	struct vline	*vl;
613 	size_t		 nth;
614 
615 	nth = window->line_off + window->curs_y;
616 	if (nth >= window->line_max)
617 		return;
618 	vl = nth_line(window, nth);
619 	if (vl->parent->type != LINE_LINK)
620 		return;
621 
622 	load_url_in_tab(current_tab(), vl->parent->alt);
623 }
624 
625 static void
626 cmd_push_button_new_tab(struct window *window)
627 {
628 	struct vline	*vl;
629 	size_t		 nth;
630 
631 	nth = window->line_off + window->curs_y;
632 	if (nth > window->line_max)
633 		return;
634 	vl = nth_line(window, nth);
635 	if (vl->parent->type != LINE_LINK)
636 		return;
637 
638 	new_tab(vl->parent->alt);
639 }
640 
641 static void
642 cmd_previous_button(struct window *window)
643 {
644 	do {
645 		if (window->current_line == NULL ||
646 		    window->current_line == TAILQ_FIRST(&window->head)) {
647 			message("No previous link");
648 			return;
649 		}
650 		cmd_previous_line(window);
651 	} while (window->current_line->parent->type != LINE_LINK);
652 }
653 
654 static void
655 cmd_next_button(struct window *window)
656 {
657 	do {
658 		if (window->current_line == NULL ||
659 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
660 			message("No next link");
661 			return;
662 		}
663 		cmd_next_line(window);
664 	} while (window->current_line->parent->type != LINE_LINK);
665 }
666 
667 static void
668 cmd_previous_page(struct window *window)
669 {
670 	struct tab *tab = current_tab();
671 
672 	if (!load_previous_page(tab))
673 		message("No previous page");
674 	else
675 		start_loading_anim(tab);
676 }
677 
678 static void
679 cmd_next_page(struct window *window)
680 {
681 	struct tab *tab = current_tab();
682 
683 	if (!load_next_page(tab))
684 		message("No next page");
685 	else
686 		start_loading_anim(tab);
687 }
688 
689 static void
690 cmd_clear_minibuf(struct window *window)
691 {
692 	handle_clear_minibuf(0, 0, NULL);
693 }
694 
695 static void
696 cmd_execute_extended_command(struct window *window)
697 {
698 	size_t	 len;
699 
700 	if (in_minibuffer) {
701 		message("We don't have enable-recursive-minibuffers");
702 		return;
703 	}
704 
705 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
706 	    &eecmd_history);
707 
708 	len = sizeof(ministate.prompt);
709 	strlcpy(ministate.prompt, "", len);
710 
711 	if (thiskey.meta)
712 		strlcat(ministate.prompt, "M-", len);
713 
714 	strlcat(ministate.prompt, keyname(thiskey.key), len);
715 	strlcat(ministate.prompt, " ", len);
716 }
717 
718 static void
719 cmd_tab_close(struct window *window)
720 {
721 	struct tab *tab, *t;
722 
723 	tab = current_tab();
724 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
725 	    TAILQ_NEXT(tab, tabs) == NULL) {
726 		message("Can't close the only tab.");
727 		return;
728 	}
729 
730 	if (evtimer_pending(&tab->loadingev, NULL))
731 		evtimer_del(&tab->loadingev);
732 
733 	stop_tab(tab);
734 
735 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
736 		t = TAILQ_NEXT(tab, tabs);
737 	TAILQ_REMOVE(&tabshead, tab, tabs);
738 	free(tab);
739 
740 	switch_to_tab(t);
741 }
742 
743 static void
744 cmd_tab_close_other(struct window *window)
745 {
746 	struct tab *t, *i;
747 
748 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
749 		if (t->flags & TAB_CURRENT)
750 			continue;
751 
752 		stop_tab(t);
753 		TAILQ_REMOVE(&tabshead, t, tabs);
754 		free(t);
755 	}
756 }
757 
758 static void
759 cmd_tab_new(struct window *window)
760 {
761 	new_tab(NEW_TAB_URL);
762 }
763 
764 static void
765 cmd_tab_next(struct window *window)
766 {
767 	struct tab *tab, *t;
768 
769 	tab = current_tab();
770 	tab->flags &= ~TAB_CURRENT;
771 
772 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
773 		t = TAILQ_FIRST(&tabshead);
774 	t->flags |= TAB_CURRENT;
775 }
776 
777 static void
778 cmd_tab_previous(struct window *window)
779 {
780 	struct tab *tab, *t;
781 
782 	tab = current_tab();
783 	tab->flags &= ~TAB_CURRENT;
784 
785 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
786 		t = TAILQ_LAST(&tabshead, tabshead);
787 	t->flags |= TAB_CURRENT;
788 }
789 
790 static void
791 cmd_tab_move(struct window *window)
792 {
793 	struct tab *tab, *t;
794 
795 	tab = current_tab();
796 	t = TAILQ_NEXT(tab, tabs);
797 	TAILQ_REMOVE(&tabshead, tab, tabs);
798 
799 	if (t == NULL)
800 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
801 	else
802 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
803 }
804 
805 static void
806 cmd_tab_move_to(struct window *window)
807 {
808 	struct tab *tab, *t;
809 
810 	tab = current_tab();
811 	t = TAILQ_PREV(tab, tabshead, tabs);
812 	TAILQ_REMOVE(&tabshead, tab, tabs);
813 
814 	if (t == NULL) {
815 		if (TAILQ_EMPTY(&tabshead))
816 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
817 		else
818 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
819 	} else
820 		TAILQ_INSERT_BEFORE(t, tab, tabs);
821 }
822 
823 static void
824 cmd_load_url(struct window *window)
825 {
826 	if (in_minibuffer) {
827 		message("We don't have enable-recursive-minibuffers");
828 		return;
829 	}
830 
831 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
832 	    &lu_history);
833 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
834 	strlcpy(ministate.buf, "gemini://", sizeof(ministate.buf));
835 	cmd_move_end_of_line(&ministate.window);
836 }
837 
838 static void
839 cmd_load_current_url(struct window *window)
840 {
841 	struct tab *tab = current_tab();
842 
843 	if (in_minibuffer) {
844 		message("We don't have enable-recursive-minibuffers");
845 		return;
846 	}
847 
848 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
849 	    &lu_history);
850 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
851 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
852 	ministate.window.cpoff = utf8_cplen(ministate.buf);
853 }
854 
855 static void
856 cmd_bookmark_page(struct window *window)
857 {
858 	struct tab *tab = current_tab();
859 
860 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
861 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
862 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
863 	ministate.window.cpoff = utf8_cplen(ministate.buf);
864 }
865 
866 static void
867 cmd_list_bookmarks(struct window *window)
868 {
869 	load_url_in_tab(current_tab(), "about:bookmarks");
870 }
871 
872 static void
873 cmd_toggle_help(struct window *window)
874 {
875 	side_window = !side_window;
876 	if (side_window)
877 		recompute_help();
878 
879 	/* ugly hack, but otherwise the window doesn't get updated
880 	 * until I call handle_resize a second time (i.e. C-l).  I
881 	 * will be happy to know why something like this is needed. */
882 	handle_resize(0, 0, NULL);
883 	handle_resize(0, 0, NULL);
884 }
885 
886 static void
887 cmd_mini_delete_char(struct window *window)
888 {
889 	char *c, *n;
890 
891 	if (!in_minibuffer) {
892 		message("text is read-only");
893 		return;
894 	}
895 
896 	minibuffer_taint_hist();
897 
898 	c = utf8_nth(window->current_line->line, window->cpoff);
899 	if (*c == '\0')
900 		return;
901 	n = utf8_next_cp(c);
902 
903 	memmove(c, n, strlen(n)+1);
904 }
905 
906 static void
907 cmd_mini_delete_backward_char(struct window *window)
908 {
909 	char *c, *p, *start;
910 
911 	if (!in_minibuffer) {
912 		message("text is read-only");
913 		return;
914 	}
915 
916 	minibuffer_taint_hist();
917 
918 	c = utf8_nth(window->current_line->line, window->cpoff);
919 	start = window->current_line->line;
920 	if (c == start)
921 		return;
922 	p = utf8_prev_cp(c-1, start);
923 
924 	memmove(p, c, strlen(c)+1);
925 	window->cpoff--;
926 }
927 
928 static void
929 cmd_mini_kill_line(struct window *window)
930 {
931 	char *c;
932 
933 	if (!in_minibuffer) {
934 		message("text is read-only");
935 		return;
936 	}
937 
938 	minibuffer_taint_hist();
939 	c = utf8_nth(window->current_line->line, window->cpoff);
940 	*c = '\0';
941 }
942 
943 static void
944 cmd_mini_abort(struct window *window)
945 {
946 	if (!in_minibuffer)
947 		return;
948 
949 	ministate.abortfn();
950 }
951 
952 static void
953 cmd_mini_complete_and_exit(struct window *window)
954 {
955 	if (!in_minibuffer)
956 		return;
957 
958 	minibuffer_taint_hist();
959 	ministate.donefn();
960 }
961 
962 static void
963 cmd_mini_previous_history_element(struct window *window)
964 {
965 	if (ministate.history == NULL) {
966 		message("No history");
967 		return;
968 	}
969 
970 	if (ministate.hist_cur == NULL ||
971 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
972 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
973 		ministate.hist_off = ministate.history->len - 1;
974 		if (ministate.hist_cur == NULL)
975 			message("No prev item");
976 	} else {
977 		ministate.hist_off--;
978 	}
979 
980 	if (ministate.hist_cur != NULL)
981 		window->current_line->line = ministate.hist_cur->h;
982 }
983 
984 static void
985 cmd_mini_next_history_element(struct window *window)
986 {
987 	if (ministate.history == NULL) {
988 		message("No history");
989 		return;
990 	}
991 
992 	if (ministate.hist_cur == NULL ||
993 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
994 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
995 		ministate.hist_off = 0;
996 		if (ministate.hist_cur == NULL)
997 			message("No next item");
998 	} else {
999 		ministate.hist_off++;
1000 	}
1001 
1002 	if (ministate.hist_cur != NULL)
1003 		window->current_line->line = ministate.hist_cur->h;
1004 }
1005 
1006 static void
1007 global_key_unbound(void)
1008 {
1009 	message("%s is undefined", keybuf);
1010 }
1011 
1012 static void
1013 minibuffer_hist_save_entry(void)
1014 {
1015 	struct hist	*hist;
1016 
1017 	if (ministate.history == NULL)
1018 		return;
1019 
1020 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1021 		abort();
1022 
1023 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1024 
1025 	if (TAILQ_EMPTY(&ministate.history->head))
1026 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1027 	else
1028 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1029 	ministate.history->len++;
1030 }
1031 
1032 /*
1033  * taint the minibuffer cache: if we're currently showing a history
1034  * element, copy that to the current buf and reset the "history
1035  * navigation" thing.
1036  */
1037 static void
1038 minibuffer_taint_hist(void)
1039 {
1040 	if (ministate.hist_cur == NULL)
1041 		return;
1042 
1043 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1044 	ministate.hist_cur = NULL;
1045 }
1046 
1047 static void
1048 minibuffer_self_insert(void)
1049 {
1050 	char	*c, tmp[5] = {0};
1051 	size_t	len;
1052 
1053 	minibuffer_taint_hist();
1054 
1055 	if (thiskey.cp == 0)
1056 		return;
1057 
1058 	len = utf8_encode(thiskey.cp, tmp);
1059 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1060 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1061 		return;
1062 
1063 	memmove(c + len, c, strlen(c)+1);
1064 	memcpy(c, tmp, len);
1065 	ministate.window.cpoff++;
1066 }
1067 
1068 static void
1069 eecmd_self_insert(void)
1070 {
1071 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1072 	    !unicode_isgraph(thiskey.cp)) {
1073 		global_key_unbound();
1074 		return;
1075 	}
1076 
1077 	minibuffer_self_insert();
1078 }
1079 
1080 static void
1081 eecmd_select(void)
1082 {
1083 	struct cmds *cmd;
1084 
1085 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1086 		if (!strcmp(cmd->cmd, ministate.buf)) {
1087 			exit_minibuffer();
1088 			minibuffer_hist_save_entry();
1089 			cmd->fn(current_window());
1090 			return;
1091 		}
1092 	}
1093 
1094 	message("No match");
1095 }
1096 
1097 static void
1098 ir_self_insert(void)
1099 {
1100 	minibuffer_self_insert();
1101 }
1102 
1103 static void
1104 ir_select(void)
1105 {
1106 	char		 buf[1025] = {0};
1107 	struct phos_uri	 uri;
1108 	struct tab	*tab;
1109 
1110 	tab = current_tab();
1111 
1112 	exit_minibuffer();
1113 	minibuffer_hist_save_entry();
1114 
1115 	/* a bit ugly but... */
1116 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1117 	phos_uri_set_query(&uri, ministate.buf);
1118 	phos_serialize_uri(&uri, buf, sizeof(buf));
1119 	load_url_in_tab(tab, buf);
1120 }
1121 
1122 static void
1123 lu_self_insert(void)
1124 {
1125 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1126 	    !unicode_isgraph(thiskey.key)) {
1127 		global_key_unbound();
1128 		return;
1129 	}
1130 
1131 	minibuffer_self_insert();
1132 }
1133 
1134 static void
1135 lu_select(void)
1136 {
1137 	exit_minibuffer();
1138 	minibuffer_hist_save_entry();
1139 	load_url_in_tab(current_tab(), ministate.buf);
1140 }
1141 
1142 static void
1143 bp_select(void)
1144 {
1145 	exit_minibuffer();
1146 	if (*ministate.buf != '\0')
1147 		add_to_bookmarks(ministate.buf);
1148 	else
1149 		message("Abort.");
1150 }
1151 
1152 static void
1153 yornp_self_insert(void)
1154 {
1155 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1156 		message("Please answer y or n");
1157 		return;
1158 	}
1159 
1160 	exit_minibuffer();
1161 	yornp_cb(thiskey.key == 'y', yornp_data);
1162 }
1163 
1164 static void
1165 yornp_abort(void)
1166 {
1167 	exit_minibuffer();
1168 	yornp_cb(0, yornp_data);
1169 }
1170 
1171 static struct vline *
1172 nth_line(struct window *window, size_t n)
1173 {
1174 	struct vline	*vl;
1175 	size_t		 i;
1176 
1177 	i = 0;
1178 	TAILQ_FOREACH(vl, &window->head, vlines) {
1179 		if (i == n)
1180 			return vl;
1181 		i++;
1182 	}
1183 
1184 	/* unreachable */
1185 	abort();
1186 }
1187 
1188 static struct tab *
1189 current_tab(void)
1190 {
1191 	struct tab *t;
1192 
1193 	TAILQ_FOREACH(t, &tabshead, tabs) {
1194 		if (t->flags & TAB_CURRENT)
1195 			return t;
1196 	}
1197 
1198 	/* unreachable */
1199 	abort();
1200 }
1201 
1202 static struct window *
1203 current_window(void)
1204 {
1205 	if (in_minibuffer)
1206 		return &ministate.window;
1207 	return &current_tab()->window;
1208 }
1209 
1210 static int
1211 readkey(void)
1212 {
1213 	uint32_t state = 0;
1214 
1215 	if ((thiskey.key = wgetch(body)) == ERR)
1216 		return 0;
1217 
1218 	thiskey.meta = thiskey.key == 27;
1219 	if (thiskey.meta) {
1220 		thiskey.key = wgetch(body);
1221 		if (thiskey.key == ERR || thiskey.key == 27) {
1222 			thiskey.meta = 0;
1223 			thiskey.key = 27;
1224 		}
1225 	}
1226 
1227 	thiskey.cp = 0;
1228 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1229 		while (1) {
1230 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1231 				break;
1232 			if ((thiskey.key = wgetch(body)) == ERR) {
1233 				message("Error decoding user input");
1234 				return 0;
1235 			}
1236 		}
1237 	}
1238 
1239 	return 1;
1240 }
1241 
1242 static void
1243 dispatch_stdio(int fd, short ev, void *d)
1244 {
1245 	struct keymap	*k;
1246 	const char	*keyname;
1247 	char		 tmp[5] = {0};
1248 
1249 	if (!readkey())
1250 		return;
1251 
1252 	if (keybuf[0] != '\0')
1253 		strlcat(keybuf, " ", sizeof(keybuf));
1254 	if (thiskey.meta)
1255 		strlcat(keybuf, "M-", sizeof(keybuf));
1256 	if (thiskey.cp != 0) {
1257 		utf8_encode(thiskey.cp, tmp);
1258 		strlcat(keybuf, tmp, sizeof(keybuf));
1259 	} else {
1260 		if ((keyname = unkbd(thiskey.key)) != NULL)
1261 			strlcat(keybuf, keyname, sizeof(keybuf));
1262 		else {
1263 			tmp[0] = thiskey.key;
1264 			strlcat(keybuf, tmp, sizeof(keybuf));
1265 		}
1266 	}
1267 
1268 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1269 		if (k->meta == thiskey.meta &&
1270 		    k->key == thiskey.key) {
1271 			if (k->fn == NULL)
1272 				current_map = &k->map;
1273 			else {
1274 				current_map = base_map;
1275 				strlcpy(keybuf, "", sizeof(keybuf));
1276 				k->fn(current_window());
1277 			}
1278 			goto done;
1279 		}
1280 	}
1281 
1282 	if (current_map->unhandled_input != NULL)
1283 		current_map->unhandled_input();
1284 	else {
1285 		global_key_unbound();
1286 	}
1287 
1288 	strlcpy(keybuf, "", sizeof(keybuf));
1289 	current_map = base_map;
1290 
1291 done:
1292 	if (side_window)
1293 		recompute_help();
1294 
1295 	redraw_tab(current_tab());
1296 }
1297 
1298 static void
1299 handle_clear_minibuf(int fd, short ev, void *d)
1300 {
1301 	free(ministate.curmesg);
1302 	ministate.curmesg = NULL;
1303 
1304 	redraw_minibuffer();
1305 	if (in_minibuffer) {
1306 		wrefresh(body);
1307 		wrefresh(minibuf);
1308 	} else {
1309 		wrefresh(minibuf);
1310 		wrefresh(body);
1311 	}
1312 }
1313 
1314 static void
1315 handle_resize(int sig, short ev, void *d)
1316 {
1317 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
1318 		event_del(&resizeev);
1319 	}
1320 	evtimer_set(&resizeev, handle_resize_timeout, NULL);
1321 	evtimer_add(&resizeev, &resize_timer);
1322 }
1323 
1324 static void
1325 handle_resize_timeout(int s, short ev, void *d)
1326 {
1327 	struct tab	*tab;
1328 
1329 	endwin();
1330 	refresh();
1331 	clear();
1332 
1333 	/* move and resize the windows, in reverse order! */
1334 
1335 	mvwin(minibuf, LINES-1, 0);
1336 	wresize(minibuf, 1, COLS);
1337 
1338 	mvwin(modeline, LINES-2, 0);
1339 	wresize(modeline, 1, COLS);
1340 
1341 	body_lines = LINES-3;
1342 	body_cols = COLS;
1343 
1344 	if (side_window) {
1345 		help_cols = 0.3 * COLS;
1346 		help_lines = LINES-3;
1347 		mvwin(help, 1, 0);
1348 		wresize(help, help_lines, help_cols);
1349 
1350 		wrap_page(&helpwin, help_cols);
1351 
1352 		body_cols = COLS - help_cols - 1;
1353 		mvwin(body, 1, help_cols);
1354 	} else
1355 		mvwin(body, 1, 0);
1356 
1357 	wresize(body, body_lines, body_cols);
1358 
1359 	wresize(tabline, 1, COLS);
1360 
1361 	tab = current_tab();
1362 
1363 	wrap_page(&tab->window, body_cols);
1364 	redraw_tab(tab);
1365 }
1366 
1367 static int
1368 wrap_page(struct window *window, int width)
1369 {
1370 	struct line		*l;
1371 	const struct line	*orig;
1372 	struct vline		*vl;
1373 	const char		*prfx;
1374 
1375 	orig = window->current_line == NULL
1376 		? NULL
1377 		: window->current_line->parent;
1378 	window->current_line = NULL;
1379 
1380 	window->curs_y = 0;
1381 	window->line_off = 0;
1382 
1383 	empty_vlist(window);
1384 
1385 	TAILQ_FOREACH(l, &window->page.head, lines) {
1386 		prfx = line_prefixes[l->type].prfx1;
1387 		switch (l->type) {
1388 		case LINE_TEXT:
1389 		case LINE_LINK:
1390 		case LINE_TITLE_1:
1391 		case LINE_TITLE_2:
1392 		case LINE_TITLE_3:
1393 		case LINE_ITEM:
1394 		case LINE_QUOTE:
1395 		case LINE_PRE_START:
1396 		case LINE_PRE_END:
1397 			wrap_text(window, prfx, l, width);
1398 			break;
1399 		case LINE_PRE_CONTENT:
1400                         hardwrap_text(window, l, width);
1401 			break;
1402 		}
1403 
1404 		if (orig == l && window->current_line == NULL) {
1405 			window->line_off = window->line_max-1;
1406 			window->current_line = TAILQ_LAST(&window->head, vhead);
1407 
1408 			while (1) {
1409 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1410 				if (vl == NULL || vl->parent != orig)
1411 					break;
1412 				window->current_line = vl;
1413 				window->line_off--;
1414 			}
1415 		}
1416 	}
1417 
1418         if (window->current_line == NULL)
1419 		window->current_line = TAILQ_FIRST(&window->head);
1420 
1421 	return 1;
1422 }
1423 
1424 static void
1425 print_vline(WINDOW *window, struct vline *vl)
1426 {
1427 	const char *text = vl->line;
1428 	const char *prfx;
1429 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1430 	int text_face = line_faces[vl->parent->type].text_prop;
1431 
1432 	if (!vl->flags)
1433 		prfx = line_prefixes[vl->parent->type].prfx1;
1434 	else
1435 		prfx = line_prefixes[vl->parent->type].prfx2;
1436 
1437 	if (text == NULL)
1438 		text = "";
1439 
1440 	wattron(window, prefix_face);
1441 	wprintw(window, "%s", prfx);
1442 	wattroff(window, prefix_face);
1443 
1444 	wattron(window, text_face);
1445 	wprintw(window, "%s", text);
1446 	wattroff(window, text_face);
1447 }
1448 
1449 static void
1450 redraw_tabline(void)
1451 {
1452 	struct tab	*tab;
1453 	size_t		 toskip, ots, tabwidth, space, x;
1454 	int		 current, y, truncated;
1455 	const char	*title;
1456 	char		 buf[25];
1457 
1458 	tabwidth = sizeof(buf)+1;
1459 	space = COLS-2;
1460 
1461 	toskip = 0;
1462 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1463 		toskip++;
1464 		if (tab->flags & TAB_CURRENT)
1465 			break;
1466 	}
1467 
1468 	if (toskip * tabwidth < space)
1469 		toskip = 0;
1470 	else {
1471 		ots = toskip;
1472 		toskip--;
1473                 while (toskip != 0 &&
1474 		    (ots - toskip+1) * tabwidth < space)
1475 			toskip--;
1476 	}
1477 
1478 	werase(tabline);
1479 	wattron(tabline, tab_face.background);
1480 	wprintw(tabline, toskip == 0 ? " " : "<");
1481 	wattroff(tabline, tab_face.background);
1482 
1483 	truncated = 0;
1484 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1485 		if (truncated)
1486 			break;
1487 		if (toskip != 0) {
1488 			toskip--;
1489 			continue;
1490 		}
1491 
1492 		getyx(tabline, y, x);
1493 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1494 			truncated = 1;
1495 
1496 		current = tab->flags & TAB_CURRENT;
1497 
1498 		if (*(title = tab->window.page.title) == '\0')
1499 			title = tab->hist_cur->h;
1500 
1501 		strlcpy(buf, " ", sizeof(buf));
1502                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1503 			/* truncation happens */
1504 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1505 		} else {
1506 			/* pad with spaces */
1507 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1508 				/* nop */ ;
1509 		}
1510 
1511 		if (current)
1512 			wattron(tabline, tab_face.current_tab);
1513 		else
1514 			wattron(tabline, tab_face.tab);
1515 
1516 		wprintw(tabline, "%s", buf);
1517 		if (TAILQ_NEXT(tab, tabs) != NULL)
1518 			wprintw(tabline, " ");
1519 
1520 		if (current)
1521 			wattroff(tabline, tab_face.current_tab);
1522 		else
1523 			wattroff(tabline, tab_face.tab);
1524 	}
1525 
1526 	wattron(tabline, tab_face.background);
1527 	for (; x < (size_t)COLS; ++x)
1528 		waddch(tabline, ' ');
1529 	if (truncated)
1530 		mvwprintw(tabline, 0, COLS-1, ">");
1531 }
1532 
1533 static void
1534 redraw_window(WINDOW *win, int height, struct window *window)
1535 {
1536 	struct vline	*vl;
1537 	int		 l;
1538 
1539 	werase(win);
1540 
1541 	window->line_off = MIN(window->line_max-1, window->line_off);
1542 	if (TAILQ_EMPTY(&window->head))
1543 		return;
1544 
1545 	l = 0;
1546 	vl = nth_line(window, window->line_off);
1547 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1548 		wmove(win, l, 0);
1549 		print_vline(win, vl);
1550 		l++;
1551 		if (l == height)
1552 			break;
1553 	}
1554 
1555 	wmove(win, window->curs_y, window->curs_x);
1556 }
1557 
1558 static void
1559 redraw_help(void)
1560 {
1561 	redraw_window(help, help_lines, &helpwin);
1562 }
1563 
1564 static void
1565 redraw_body(struct tab *tab)
1566 {
1567 	redraw_window(body, body_lines, &tab->window);
1568 }
1569 
1570 static inline char
1571 trust_status_char(enum trust_state ts)
1572 {
1573 	switch (ts) {
1574 	case TS_UNKNOWN:	return 'u';
1575 	case TS_UNTRUSTED:	return '!';
1576 	case TS_TRUSTED:	return 'v';
1577 	case TS_VERIFIED:	return 'V';
1578 	}
1579 }
1580 
1581 static void
1582 redraw_modeline(struct tab *tab)
1583 {
1584 	double		 pct;
1585 	int		 x, y, max_x, max_y;
1586 	const char	*mode = tab->window.page.name;
1587 	const char	*spin = "-\\|/";
1588 
1589 	werase(modeline);
1590 	wattron(modeline, A_REVERSE);
1591 	wmove(modeline, 0, 0);
1592 
1593 	wprintw(modeline, "-%c%c %s ",
1594 	    spin[tab->loading_anim_step],
1595 	    trust_status_char(tab->trust),
1596 	    mode == NULL ? "(none)" : mode);
1597 
1598 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1599 
1600 	if (tab->window.line_max <= (size_t)body_lines)
1601                 wprintw(modeline, "All ");
1602 	else if (tab->window.line_off == 0)
1603                 wprintw(modeline, "Top ");
1604 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1605 		wprintw(modeline, "Bottom ");
1606 	else
1607 		wprintw(modeline, "%.0f%% ", pct);
1608 
1609 	wprintw(modeline, "%d/%d %s ",
1610 	    tab->window.line_off + tab->window.curs_y,
1611 	    tab->window.line_max,
1612 	    tab->hist_cur->h);
1613 
1614 	getyx(modeline, y, x);
1615 	getmaxyx(modeline, max_y, max_x);
1616 
1617 	(void)y;
1618 	(void)max_y;
1619 
1620 	for (; x < max_x; ++x)
1621 		waddstr(modeline, "-");
1622 }
1623 
1624 static void
1625 redraw_minibuffer(void)
1626 {
1627 	struct tab *tab;
1628 	size_t off_y, off_x = 0;
1629 	char *start, *c;
1630 
1631 	werase(minibuf);
1632 
1633 	if (in_minibuffer) {
1634 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1635 		if (ministate.hist_cur != NULL)
1636 			wprintw(minibuf, "(%zu/%zu) ",
1637 			    ministate.hist_off + 1,
1638 			    ministate.history->len);
1639 
1640 		getyx(minibuf, off_y, off_x);
1641 
1642 		start = ministate.hist_cur != NULL
1643 			? ministate.hist_cur->h
1644 			: ministate.buf;
1645 		c = utf8_nth(ministate.window.current_line->line,
1646 		    ministate.window.cpoff);
1647 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1648 			start = utf8_next_cp(start);
1649 		}
1650 
1651 		waddstr(minibuf, start);
1652 	}
1653 
1654 	if (ministate.curmesg != NULL)
1655                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1656 		    ministate.curmesg);
1657 
1658 	if (!in_minibuffer && ministate.curmesg == NULL)
1659 		waddstr(minibuf, keybuf);
1660 
1661 	/* If nothing else, show the URL at point */
1662 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1663 		tab = current_tab();
1664 		if (tab->window.current_line != NULL &&
1665 		    tab->window.current_line->parent->type == LINE_LINK)
1666 			waddstr(minibuf, tab->window.current_line->parent->alt);
1667 	}
1668 
1669 	if (in_minibuffer)
1670 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1671 }
1672 
1673 static void
1674 redraw_tab(struct tab *tab)
1675 {
1676 	if (side_window) {
1677 		redraw_help();
1678 		wnoutrefresh(help);
1679 	}
1680 
1681 	redraw_tabline();
1682 	redraw_body(tab);
1683 	redraw_modeline(tab);
1684 	redraw_minibuffer();
1685 
1686 	wnoutrefresh(tabline);
1687 	wnoutrefresh(modeline);
1688 
1689 	if (in_minibuffer) {
1690 		wnoutrefresh(body);
1691 		wnoutrefresh(minibuf);
1692 	} else {
1693 		wnoutrefresh(minibuf);
1694 		wnoutrefresh(body);
1695 	}
1696 
1697 	doupdate();
1698 }
1699 
1700 static void
1701 emit_help_item(char *prfx, void *fn)
1702 {
1703 	struct line	*l;
1704 	struct cmds	*cmd;
1705 
1706 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1707 		if (fn == cmd->fn)
1708 			break;
1709 	}
1710 	assert(cmd != NULL);
1711 
1712 	if ((l = calloc(1, sizeof(*l))) == NULL)
1713 		abort();
1714 
1715 	l->type = LINE_TEXT;
1716 	l->alt = NULL;
1717 
1718 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1719 
1720 	if (TAILQ_EMPTY(&helpwin.page.head))
1721 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1722 	else
1723 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1724 }
1725 
1726 static void
1727 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1728 {
1729 	struct keymap	*k;
1730 	char		 p[32];
1731 	const char	*kn;
1732 
1733 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1734 		strlcpy(p, prfx, sizeof(p));
1735 		if (*p != '\0')
1736 			strlcat(p, " ", sizeof(p));
1737 		if (k->meta)
1738 			strlcat(p, "M-", sizeof(p));
1739 		if ((kn = unkbd(k->key)) != NULL)
1740 			strlcat(p, kn, sizeof(p));
1741 		else
1742 			strlcat(p, keyname(k->key), sizeof(p));
1743 
1744 		if (k->fn == NULL)
1745 			rec_compute_help(&k->map, p, sizeof(p));
1746 		else
1747 			emit_help_item(p, k->fn);
1748 	}
1749 }
1750 
1751 static void
1752 recompute_help(void)
1753 {
1754 	char	p[32] = { 0 };
1755 
1756 	empty_vlist(&helpwin);
1757 	empty_linelist(&helpwin);
1758 	rec_compute_help(current_map, p, sizeof(p));
1759 	wrap_page(&helpwin, help_cols);
1760 }
1761 
1762 static void
1763 vmessage(const char *fmt, va_list ap)
1764 {
1765 	if (evtimer_pending(&clminibufev, NULL))
1766 		evtimer_del(&clminibufev);
1767 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1768 	evtimer_add(&clminibufev, &clminibufev_timer);
1769 
1770 	free(ministate.curmesg);
1771 
1772 	/* TODO: what to do if the allocation fails here? */
1773 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1774 		ministate.curmesg = NULL;
1775 
1776 	redraw_minibuffer();
1777 	if (in_minibuffer) {
1778 		wrefresh(body);
1779 		wrefresh(minibuf);
1780 	} else {
1781 		wrefresh(minibuf);
1782 		wrefresh(body);
1783 	}
1784 }
1785 
1786 static void
1787 message(const char *fmt, ...)
1788 {
1789 	va_list ap;
1790 
1791 	va_start(ap, fmt);
1792 	vmessage(fmt, ap);
1793 	va_end(ap);
1794 }
1795 
1796 static void
1797 start_loading_anim(struct tab *tab)
1798 {
1799 	if (tab->loading_anim)
1800 		return;
1801 	tab->loading_anim = 1;
1802 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1803 	evtimer_add(&tab->loadingev, &loadingev_timer);
1804 }
1805 
1806 static void
1807 update_loading_anim(int fd, short ev, void *d)
1808 {
1809 	struct tab	*tab = d;
1810 
1811 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1812 
1813 	if (tab->flags & TAB_CURRENT) {
1814 		redraw_modeline(tab);
1815 		wrefresh(modeline);
1816 		wrefresh(body);
1817 		if (in_minibuffer)
1818 			wrefresh(minibuf);
1819 	}
1820 
1821 	evtimer_add(&tab->loadingev, &loadingev_timer);
1822 }
1823 
1824 static void
1825 stop_loading_anim(struct tab *tab)
1826 {
1827 	if (!tab->loading_anim)
1828 		return;
1829 	evtimer_del(&tab->loadingev);
1830 	tab->loading_anim = 0;
1831 	tab->loading_anim_step = 0;
1832 
1833 	if (!(tab->flags & TAB_CURRENT))
1834 		return;
1835 
1836 	redraw_modeline(tab);
1837 
1838 	wrefresh(modeline);
1839 	wrefresh(body);
1840 	if (in_minibuffer)
1841 		wrefresh(minibuf);
1842 }
1843 
1844 static void
1845 load_url_in_tab(struct tab *tab, const char *url)
1846 {
1847 	message("Loading %s...", url);
1848 	start_loading_anim(tab);
1849 	load_url(tab, url);
1850 
1851 	tab->window.curs_x = 0;
1852 	tab->window.curs_y = 0;
1853 	redraw_tab(tab);
1854 }
1855 
1856 static void
1857 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1858     void (*abortfn)(void), struct histhead *hist)
1859 {
1860 	in_minibuffer = 1;
1861 	base_map = &minibuffer_map;
1862 	current_map = &minibuffer_map;
1863 
1864 	base_map->unhandled_input = self_insert_fn;
1865 
1866 	ministate.donefn = donefn;
1867 	ministate.abortfn = abortfn;
1868 	memset(ministate.buf, 0, sizeof(ministate.buf));
1869 	ministate.window.current_line = &ministate.vline;
1870 	ministate.window.current_line->line = ministate.buf;
1871 	ministate.window.cpoff = 0;
1872 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1873 
1874 	ministate.history = hist;
1875 	ministate.hist_cur = NULL;
1876 	ministate.hist_off = 0;
1877 }
1878 
1879 static void
1880 exit_minibuffer(void)
1881 {
1882 	werase(minibuf);
1883 
1884 	in_minibuffer = 0;
1885 	base_map = &global_map;
1886 	current_map = &global_map;
1887 }
1888 
1889 static void
1890 switch_to_tab(struct tab *tab)
1891 {
1892 	struct tab	*t;
1893 
1894 	TAILQ_FOREACH(t, &tabshead, tabs) {
1895 		t->flags &= ~TAB_CURRENT;
1896 	}
1897 
1898 	tab->flags |= TAB_CURRENT;
1899 }
1900 
1901 unsigned int
1902 tab_new_id(void)
1903 {
1904 	return tab_counter++;
1905 }
1906 
1907 static struct tab *
1908 new_tab(const char *url)
1909 {
1910 	struct tab	*tab;
1911 
1912 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1913 		event_loopbreak();
1914 		return NULL;
1915 	}
1916 
1917 	TAILQ_INIT(&tab->hist.head);
1918 
1919 	TAILQ_INIT(&tab->window.head);
1920 
1921 	tab->id = tab_new_id();
1922 	switch_to_tab(tab);
1923 
1924 	if (TAILQ_EMPTY(&tabshead))
1925 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1926 	else
1927 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1928 
1929 	load_url_in_tab(tab, url);
1930 	return tab;
1931 }
1932 
1933 static void
1934 session_new_tab_cb(const char *url)
1935 {
1936 	new_tab(url);
1937 }
1938 
1939 static void
1940 usage(void)
1941 {
1942 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1943 }
1944 
1945 int
1946 ui_init(int argc, char * const *argv)
1947 {
1948 	const char *url = NEW_TAB_URL;
1949 	int ch;
1950 
1951 	while ((ch = getopt(argc, argv, "")) != -1) {
1952 		switch (ch) {
1953 		default:
1954 			usage();
1955 			return 0;
1956 		}
1957 	}
1958 	argc -= optind;
1959 	argv += optind;
1960 
1961 	if (argc != 0)
1962 		url = argv[0];
1963 
1964 	setlocale(LC_ALL, "");
1965 
1966 	TAILQ_INIT(&global_map.m);
1967 	global_map.unhandled_input = global_key_unbound;
1968 
1969 	TAILQ_INIT(&minibuffer_map.m);
1970 
1971 	TAILQ_INIT(&eecmd_history.head);
1972 	TAILQ_INIT(&ir_history.head);
1973 	TAILQ_INIT(&lu_history.head);
1974 
1975 	ministate.line.type = LINE_TEXT;
1976 	ministate.vline.parent = &ministate.line;
1977 	ministate.window.current_line = &ministate.vline;
1978 
1979 	/* initialize help window */
1980 	TAILQ_INIT(&helpwin.head);
1981 
1982 	base_map = &global_map;
1983 	current_map = &global_map;
1984 	load_default_keys();
1985 
1986 	initscr();
1987 	raw();
1988 	noecho();
1989 
1990 	nonl();
1991 	intrflush(stdscr, FALSE);
1992 
1993 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1994 		return 0;
1995 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1996 		return 0;
1997 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1998 		return 0;
1999 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
2000 		return 0;
2001 	if ((help = newwin(1, 1, 1, 0)) == NULL)
2002 		return 0;
2003 
2004 	body_lines = LINES-3;
2005 	body_cols = COLS;
2006 
2007 	keypad(body, TRUE);
2008 	scrollok(body, TRUE);
2009 
2010 	/* non-blocking input */
2011 	wtimeout(body, 0);
2012 
2013 	mvwprintw(body, 0, 0, "");
2014 
2015 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
2016 	event_add(&stdioev, NULL);
2017 
2018 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
2019 	signal_add(&winchev, NULL);
2020 
2021 	load_last_session(session_new_tab_cb);
2022 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
2023 		new_tab(url);
2024 
2025 	return 1;
2026 }
2027 
2028 void
2029 ui_on_tab_loaded(struct tab *tab)
2030 {
2031 	stop_loading_anim(tab);
2032 	message("Loaded %s", tab->hist_cur->h);
2033 
2034 	redraw_tabline();
2035 	wrefresh(tabline);
2036 	if (in_minibuffer)
2037 		wrefresh(minibuf);
2038 	else
2039 		wrefresh(body);
2040 }
2041 
2042 void
2043 ui_on_tab_refresh(struct tab *tab)
2044 {
2045 	wrap_page(&tab->window, body_cols);
2046 	if (tab->flags & TAB_CURRENT) {
2047 		restore_cursor(&tab->window);
2048 		redraw_tab(tab);
2049 	}
2050 }
2051 
2052 void
2053 ui_require_input(struct tab *tab, int hide)
2054 {
2055 	/* TODO: hard-switching to another tab is ugly */
2056 	switch_to_tab(tab);
2057 
2058 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2059 	    &ir_history);
2060 	strlcpy(ministate.prompt, "Input required: ",
2061 	    sizeof(ministate.prompt));
2062 	redraw_tab(tab);
2063 }
2064 
2065 void
2066 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2067     unsigned int data)
2068 {
2069 	size_t len;
2070 
2071 	if (in_minibuffer) {
2072 		fn(0, data);
2073 		return;
2074 	}
2075 
2076 	yornp_cb = fn;
2077 	yornp_data = data;
2078 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2079 	    yornp_abort, NULL);
2080 
2081 	len = sizeof(ministate.prompt);
2082 	strlcpy(ministate.prompt, prompt, len);
2083 	strlcat(ministate.prompt, " (y or n) ", len);
2084 	redraw_tab(current_tab());
2085 }
2086 
2087 void
2088 ui_notify(const char *fmt, ...)
2089 {
2090 	va_list ap;
2091 
2092 	va_start(ap, fmt);
2093 	vmessage(fmt, ap);
2094 	va_end(ap);
2095 }
2096 
2097 void
2098 ui_end(void)
2099 {
2100 	endwin();
2101 }