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Date:: Wed May 12 12:04:22 2021 UTC
Message:: change some include <> → "" and reorder
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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 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 
716 	if (thiskey.meta)
717 		strlcat(ministate.prompt, " ", len);
718 }
719 
720 static void
721 cmd_tab_close(struct window *window)
722 {
723 	struct tab *tab, *t;
724 
725 	tab = current_tab();
726 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
727 	    TAILQ_NEXT(tab, tabs) == NULL) {
728 		message("Can't close the only tab.");
729 		return;
730 	}
731 
732 	if (evtimer_pending(&tab->loadingev, NULL))
733 		evtimer_del(&tab->loadingev);
734 
735 	stop_tab(tab);
736 
737 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
738 		t = TAILQ_NEXT(tab, tabs);
739 	TAILQ_REMOVE(&tabshead, tab, tabs);
740 	free(tab);
741 
742 	switch_to_tab(t);
743 }
744 
745 static void
746 cmd_tab_close_other(struct window *window)
747 {
748 	struct tab *t, *i;
749 
750 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
751 		if (t->flags & TAB_CURRENT)
752 			continue;
753 
754 		stop_tab(t);
755 		TAILQ_REMOVE(&tabshead, t, tabs);
756 		free(t);
757 	}
758 }
759 
760 static void
761 cmd_tab_new(struct window *window)
762 {
763 	new_tab(NEW_TAB_URL);
764 }
765 
766 static void
767 cmd_tab_next(struct window *window)
768 {
769 	struct tab *tab, *t;
770 
771 	tab = current_tab();
772 	tab->flags &= ~TAB_CURRENT;
773 
774 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
775 		t = TAILQ_FIRST(&tabshead);
776 	t->flags |= TAB_CURRENT;
777 }
778 
779 static void
780 cmd_tab_previous(struct window *window)
781 {
782 	struct tab *tab, *t;
783 
784 	tab = current_tab();
785 	tab->flags &= ~TAB_CURRENT;
786 
787 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
788 		t = TAILQ_LAST(&tabshead, tabshead);
789 	t->flags |= TAB_CURRENT;
790 }
791 
792 static void
793 cmd_tab_move(struct window *window)
794 {
795 	struct tab *tab, *t;
796 
797 	tab = current_tab();
798 	t = TAILQ_NEXT(tab, tabs);
799 	TAILQ_REMOVE(&tabshead, tab, tabs);
800 
801 	if (t == NULL)
802 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
803 	else
804 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
805 }
806 
807 static void
808 cmd_tab_move_to(struct window *window)
809 {
810 	struct tab *tab, *t;
811 
812 	tab = current_tab();
813 	t = TAILQ_PREV(tab, tabshead, tabs);
814 	TAILQ_REMOVE(&tabshead, tab, tabs);
815 
816 	if (t == NULL) {
817 		if (TAILQ_EMPTY(&tabshead))
818 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
819 		else
820 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
821 	} else
822 		TAILQ_INSERT_BEFORE(t, tab, tabs);
823 }
824 
825 static void
826 cmd_load_url(struct window *window)
827 {
828 	if (in_minibuffer) {
829 		message("We don't have enable-recursive-minibuffers");
830 		return;
831 	}
832 
833 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
834 	    &lu_history);
835 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
836 	strlcpy(ministate.buf, "gemini://", sizeof(ministate.buf));
837 	cmd_move_end_of_line(&ministate.window);
838 }
839 
840 static void
841 cmd_load_current_url(struct window *window)
842 {
843 	struct tab *tab = current_tab();
844 
845 	if (in_minibuffer) {
846 		message("We don't have enable-recursive-minibuffers");
847 		return;
848 	}
849 
850 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
851 	    &lu_history);
852 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
853 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
854 	ministate.window.cpoff = utf8_cplen(ministate.buf);
855 }
856 
857 static void
858 cmd_bookmark_page(struct window *window)
859 {
860 	struct tab *tab = current_tab();
861 
862 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
863 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
864 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
865 	ministate.window.cpoff = utf8_cplen(ministate.buf);
866 }
867 
868 static void
869 cmd_list_bookmarks(struct window *window)
870 {
871 	load_url_in_tab(current_tab(), "about:bookmarks");
872 }
873 
874 static void
875 cmd_toggle_help(struct window *window)
876 {
877 	side_window = !side_window;
878 	if (side_window)
879 		recompute_help();
880 
881 	/* ugly hack, but otherwise the window doesn't get updated
882 	 * until I call handle_resize a second time (i.e. C-l).  I
883 	 * will be happy to know why something like this is needed. */
884 	handle_resize(0, 0, NULL);
885 	handle_resize(0, 0, NULL);
886 }
887 
888 static void
889 cmd_mini_delete_char(struct window *window)
890 {
891 	char *c, *n;
892 
893 	if (!in_minibuffer) {
894 		message("text is read-only");
895 		return;
896 	}
897 
898 	minibuffer_taint_hist();
899 
900 	c = utf8_nth(window->current_line->line, window->cpoff);
901 	if (*c == '\0')
902 		return;
903 	n = utf8_next_cp(c);
904 
905 	memmove(c, n, strlen(n)+1);
906 }
907 
908 static void
909 cmd_mini_delete_backward_char(struct window *window)
910 {
911 	char *c, *p, *start;
912 
913 	if (!in_minibuffer) {
914 		message("text is read-only");
915 		return;
916 	}
917 
918 	minibuffer_taint_hist();
919 
920 	c = utf8_nth(window->current_line->line, window->cpoff);
921 	start = window->current_line->line;
922 	if (c == start)
923 		return;
924 	p = utf8_prev_cp(c-1, start);
925 
926 	memmove(p, c, strlen(c)+1);
927 	window->cpoff--;
928 }
929 
930 static void
931 cmd_mini_kill_line(struct window *window)
932 {
933 	char *c;
934 
935 	if (!in_minibuffer) {
936 		message("text is read-only");
937 		return;
938 	}
939 
940 	minibuffer_taint_hist();
941 	c = utf8_nth(window->current_line->line, window->cpoff);
942 	*c = '\0';
943 }
944 
945 static void
946 cmd_mini_abort(struct window *window)
947 {
948 	if (!in_minibuffer)
949 		return;
950 
951 	ministate.abortfn();
952 }
953 
954 static void
955 cmd_mini_complete_and_exit(struct window *window)
956 {
957 	if (!in_minibuffer)
958 		return;
959 
960 	minibuffer_taint_hist();
961 	ministate.donefn();
962 }
963 
964 static void
965 cmd_mini_previous_history_element(struct window *window)
966 {
967 	if (ministate.history == NULL) {
968 		message("No history");
969 		return;
970 	}
971 
972 	if (ministate.hist_cur == NULL ||
973 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
974 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
975 		ministate.hist_off = ministate.history->len - 1;
976 		if (ministate.hist_cur == NULL)
977 			message("No prev item");
978 	} else {
979 		ministate.hist_off--;
980 	}
981 
982 	if (ministate.hist_cur != NULL)
983 		window->current_line->line = ministate.hist_cur->h;
984 }
985 
986 static void
987 cmd_mini_next_history_element(struct window *window)
988 {
989 	if (ministate.history == NULL) {
990 		message("No history");
991 		return;
992 	}
993 
994 	if (ministate.hist_cur == NULL ||
995 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
996 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
997 		ministate.hist_off = 0;
998 		if (ministate.hist_cur == NULL)
999 			message("No next item");
1000 	} else {
1001 		ministate.hist_off++;
1002 	}
1003 
1004 	if (ministate.hist_cur != NULL)
1005 		window->current_line->line = ministate.hist_cur->h;
1006 }
1007 
1008 static void
1009 global_key_unbound(void)
1010 {
1011 	message("%s is undefined", keybuf);
1012 }
1013 
1014 static void
1015 minibuffer_hist_save_entry(void)
1016 {
1017 	struct hist	*hist;
1018 
1019 	if (ministate.history == NULL)
1020 		return;
1021 
1022 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1023 		abort();
1024 
1025 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1026 
1027 	if (TAILQ_EMPTY(&ministate.history->head))
1028 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1029 	else
1030 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1031 	ministate.history->len++;
1032 }
1033 
1034 /*
1035  * taint the minibuffer cache: if we're currently showing a history
1036  * element, copy that to the current buf and reset the "history
1037  * navigation" thing.
1038  */
1039 static void
1040 minibuffer_taint_hist(void)
1041 {
1042 	if (ministate.hist_cur == NULL)
1043 		return;
1044 
1045 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1046 	ministate.hist_cur = NULL;
1047 }
1048 
1049 static void
1050 minibuffer_self_insert(void)
1051 {
1052 	char	*c, tmp[5] = {0};
1053 	size_t	len;
1054 
1055 	minibuffer_taint_hist();
1056 
1057 	if (thiskey.cp == 0)
1058 		return;
1059 
1060 	len = utf8_encode(thiskey.cp, tmp);
1061 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1062 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1063 		return;
1064 
1065 	memmove(c + len, c, strlen(c)+1);
1066 	memcpy(c, tmp, len);
1067 	ministate.window.cpoff++;
1068 }
1069 
1070 static void
1071 eecmd_self_insert(void)
1072 {
1073 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1074 	    !unicode_isgraph(thiskey.cp)) {
1075 		global_key_unbound();
1076 		return;
1077 	}
1078 
1079 	minibuffer_self_insert();
1080 }
1081 
1082 static void
1083 eecmd_select(void)
1084 {
1085 	struct cmds *cmd;
1086 
1087 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1088 		if (!strcmp(cmd->cmd, ministate.buf)) {
1089 			exit_minibuffer();
1090 			minibuffer_hist_save_entry();
1091 			cmd->fn(current_window());
1092 			return;
1093 		}
1094 	}
1095 
1096 	message("No match");
1097 }
1098 
1099 static void
1100 ir_self_insert(void)
1101 {
1102 	minibuffer_self_insert();
1103 }
1104 
1105 static void
1106 ir_select(void)
1107 {
1108 	char		 buf[1025] = {0};
1109 	struct phos_uri	 uri;
1110 	struct tab	*tab;
1111 
1112 	tab = current_tab();
1113 
1114 	exit_minibuffer();
1115 	minibuffer_hist_save_entry();
1116 
1117 	/* a bit ugly but... */
1118 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1119 	phos_uri_set_query(&uri, ministate.buf);
1120 	phos_serialize_uri(&uri, buf, sizeof(buf));
1121 	load_url_in_tab(tab, buf);
1122 }
1123 
1124 static void
1125 lu_self_insert(void)
1126 {
1127 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1128 	    !unicode_isgraph(thiskey.key)) {
1129 		global_key_unbound();
1130 		return;
1131 	}
1132 
1133 	minibuffer_self_insert();
1134 }
1135 
1136 static void
1137 lu_select(void)
1138 {
1139 	exit_minibuffer();
1140 	minibuffer_hist_save_entry();
1141 	load_url_in_tab(current_tab(), ministate.buf);
1142 }
1143 
1144 static void
1145 bp_select(void)
1146 {
1147 	exit_minibuffer();
1148 	if (*ministate.buf != '\0')
1149 		add_to_bookmarks(ministate.buf);
1150 	else
1151 		message("Abort.");
1152 }
1153 
1154 static void
1155 yornp_self_insert(void)
1156 {
1157 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1158 		message("Please answer y or n");
1159 		return;
1160 	}
1161 
1162 	exit_minibuffer();
1163 	yornp_cb(thiskey.key == 'y', yornp_data);
1164 }
1165 
1166 static void
1167 yornp_abort(void)
1168 {
1169 	exit_minibuffer();
1170 	yornp_cb(0, yornp_data);
1171 }
1172 
1173 static struct vline *
1174 nth_line(struct window *window, size_t n)
1175 {
1176 	struct vline	*vl;
1177 	size_t		 i;
1178 
1179 	i = 0;
1180 	TAILQ_FOREACH(vl, &window->head, vlines) {
1181 		if (i == n)
1182 			return vl;
1183 		i++;
1184 	}
1185 
1186 	/* unreachable */
1187 	abort();
1188 }
1189 
1190 static struct tab *
1191 current_tab(void)
1192 {
1193 	struct tab *t;
1194 
1195 	TAILQ_FOREACH(t, &tabshead, tabs) {
1196 		if (t->flags & TAB_CURRENT)
1197 			return t;
1198 	}
1199 
1200 	/* unreachable */
1201 	abort();
1202 }
1203 
1204 static struct window *
1205 current_window(void)
1206 {
1207 	if (in_minibuffer)
1208 		return &ministate.window;
1209 	return &current_tab()->window;
1210 }
1211 
1212 static int
1213 readkey(void)
1214 {
1215 	uint32_t state = 0;
1216 
1217 	if ((thiskey.key = wgetch(body)) == ERR)
1218 		return 0;
1219 
1220 	thiskey.meta = thiskey.key == 27;
1221 	if (thiskey.meta) {
1222 		thiskey.key = wgetch(body);
1223 		if (thiskey.key == ERR || thiskey.key == 27) {
1224 			thiskey.meta = 0;
1225 			thiskey.key = 27;
1226 		}
1227 	}
1228 
1229 	thiskey.cp = 0;
1230 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1231 		while (1) {
1232 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1233 				break;
1234 			if ((thiskey.key = wgetch(body)) == ERR) {
1235 				message("Error decoding user input");
1236 				return 0;
1237 			}
1238 		}
1239 	}
1240 
1241 	return 1;
1242 }
1243 
1244 static void
1245 dispatch_stdio(int fd, short ev, void *d)
1246 {
1247 	struct keymap	*k;
1248 	const char	*keyname;
1249 	char		 tmp[5] = {0};
1250 
1251 	if (!readkey())
1252 		return;
1253 
1254 	if (keybuf[0] != '\0')
1255 		strlcat(keybuf, " ", sizeof(keybuf));
1256 	if (thiskey.meta)
1257 		strlcat(keybuf, "M-", sizeof(keybuf));
1258 	if (thiskey.cp != 0) {
1259 		utf8_encode(thiskey.cp, tmp);
1260 		strlcat(keybuf, tmp, sizeof(keybuf));
1261 	} else {
1262 		if ((keyname = unkbd(thiskey.key)) != NULL)
1263 			strlcat(keybuf, keyname, sizeof(keybuf));
1264 		else {
1265 			tmp[0] = thiskey.key;
1266 			strlcat(keybuf, tmp, sizeof(keybuf));
1267 		}
1268 	}
1269 
1270 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1271 		if (k->meta == thiskey.meta &&
1272 		    k->key == thiskey.key) {
1273 			if (k->fn == NULL)
1274 				current_map = &k->map;
1275 			else {
1276 				current_map = base_map;
1277 				strlcpy(keybuf, "", sizeof(keybuf));
1278 				k->fn(current_window());
1279 			}
1280 			goto done;
1281 		}
1282 	}
1283 
1284 	if (current_map->unhandled_input != NULL)
1285 		current_map->unhandled_input();
1286 	else {
1287 		global_key_unbound();
1288 	}
1289 
1290 	strlcpy(keybuf, "", sizeof(keybuf));
1291 	current_map = base_map;
1292 
1293 done:
1294 	if (side_window)
1295 		recompute_help();
1296 
1297 	redraw_tab(current_tab());
1298 }
1299 
1300 static void
1301 handle_clear_minibuf(int fd, short ev, void *d)
1302 {
1303 	free(ministate.curmesg);
1304 	ministate.curmesg = NULL;
1305 
1306 	redraw_minibuffer();
1307 	if (in_minibuffer) {
1308 		wrefresh(body);
1309 		wrefresh(minibuf);
1310 	} else {
1311 		wrefresh(minibuf);
1312 		wrefresh(body);
1313 	}
1314 }
1315 
1316 static void
1317 handle_resize(int sig, short ev, void *d)
1318 {
1319 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
1320 		event_del(&resizeev);
1321 	}
1322 	evtimer_set(&resizeev, handle_resize_timeout, NULL);
1323 	evtimer_add(&resizeev, &resize_timer);
1324 }
1325 
1326 static void
1327 handle_resize_timeout(int s, short ev, void *d)
1328 {
1329 	struct tab	*tab;
1330 
1331 	endwin();
1332 	refresh();
1333 	clear();
1334 
1335 	/* move and resize the windows, in reverse order! */
1336 
1337 	mvwin(minibuf, LINES-1, 0);
1338 	wresize(minibuf, 1, COLS);
1339 
1340 	mvwin(modeline, LINES-2, 0);
1341 	wresize(modeline, 1, COLS);
1342 
1343 	body_lines = LINES-3;
1344 	body_cols = COLS;
1345 
1346 	if (side_window) {
1347 		help_cols = 0.3 * COLS;
1348 		help_lines = LINES-3;
1349 		mvwin(help, 1, 0);
1350 		wresize(help, help_lines, help_cols);
1351 
1352 		wrap_page(&helpwin, help_cols);
1353 
1354 		body_cols = COLS - help_cols - 1;
1355 		mvwin(body, 1, help_cols);
1356 	} else
1357 		mvwin(body, 1, 0);
1358 
1359 	wresize(body, body_lines, body_cols);
1360 
1361 	wresize(tabline, 1, COLS);
1362 
1363 	tab = current_tab();
1364 
1365 	wrap_page(&tab->window, body_cols);
1366 	redraw_tab(tab);
1367 }
1368 
1369 static int
1370 wrap_page(struct window *window, int width)
1371 {
1372 	struct line		*l;
1373 	const struct line	*orig;
1374 	struct vline		*vl;
1375 	const char		*prfx;
1376 
1377 	orig = window->current_line == NULL
1378 		? NULL
1379 		: window->current_line->parent;
1380 	window->current_line = NULL;
1381 
1382 	window->curs_y = 0;
1383 	window->line_off = 0;
1384 
1385 	empty_vlist(window);
1386 
1387 	TAILQ_FOREACH(l, &window->page.head, lines) {
1388 		prfx = line_prefixes[l->type].prfx1;
1389 		switch (l->type) {
1390 		case LINE_TEXT:
1391 		case LINE_LINK:
1392 		case LINE_TITLE_1:
1393 		case LINE_TITLE_2:
1394 		case LINE_TITLE_3:
1395 		case LINE_ITEM:
1396 		case LINE_QUOTE:
1397 		case LINE_PRE_START:
1398 		case LINE_PRE_END:
1399 			wrap_text(window, prfx, l, width);
1400 			break;
1401 		case LINE_PRE_CONTENT:
1402                         hardwrap_text(window, l, width);
1403 			break;
1404 		}
1405 
1406 		if (orig == l && window->current_line == NULL) {
1407 			window->line_off = window->line_max-1;
1408 			window->current_line = TAILQ_LAST(&window->head, vhead);
1409 
1410 			while (1) {
1411 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1412 				if (vl == NULL || vl->parent != orig)
1413 					break;
1414 				window->current_line = vl;
1415 				window->line_off--;
1416 			}
1417 		}
1418 	}
1419 
1420         if (window->current_line == NULL)
1421 		window->current_line = TAILQ_FIRST(&window->head);
1422 
1423 	return 1;
1424 }
1425 
1426 static void
1427 print_vline(WINDOW *window, struct vline *vl)
1428 {
1429 	const char *text = vl->line;
1430 	const char *prfx;
1431 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1432 	int text_face = line_faces[vl->parent->type].text_prop;
1433 
1434 	if (!vl->flags)
1435 		prfx = line_prefixes[vl->parent->type].prfx1;
1436 	else
1437 		prfx = line_prefixes[vl->parent->type].prfx2;
1438 
1439 	if (text == NULL)
1440 		text = "";
1441 
1442 	wattron(window, prefix_face);
1443 	wprintw(window, "%s", prfx);
1444 	wattroff(window, prefix_face);
1445 
1446 	wattron(window, text_face);
1447 	wprintw(window, "%s", text);
1448 	wattroff(window, text_face);
1449 }
1450 
1451 static void
1452 redraw_tabline(void)
1453 {
1454 	struct tab	*tab;
1455 	size_t		 toskip, ots, tabwidth, space, x;
1456 	int		 current, y, truncated;
1457 	const char	*title;
1458 	char		 buf[25];
1459 
1460 	tabwidth = sizeof(buf)+1;
1461 	space = COLS-2;
1462 
1463 	toskip = 0;
1464 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1465 		toskip++;
1466 		if (tab->flags & TAB_CURRENT)
1467 			break;
1468 	}
1469 
1470 	if (toskip * tabwidth < space)
1471 		toskip = 0;
1472 	else {
1473 		ots = toskip;
1474 		toskip--;
1475                 while (toskip != 0 &&
1476 		    (ots - toskip+1) * tabwidth < space)
1477 			toskip--;
1478 	}
1479 
1480 	werase(tabline);
1481 	wattron(tabline, tab_face.background);
1482 	wprintw(tabline, toskip == 0 ? " " : "<");
1483 	wattroff(tabline, tab_face.background);
1484 
1485 	truncated = 0;
1486 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1487 		if (truncated)
1488 			break;
1489 		if (toskip != 0) {
1490 			toskip--;
1491 			continue;
1492 		}
1493 
1494 		getyx(tabline, y, x);
1495 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1496 			truncated = 1;
1497 
1498 		current = tab->flags & TAB_CURRENT;
1499 
1500 		if (*(title = tab->window.page.title) == '\0')
1501 			title = tab->hist_cur->h;
1502 
1503 		strlcpy(buf, " ", sizeof(buf));
1504                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1505 			/* truncation happens */
1506 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1507 		} else {
1508 			/* pad with spaces */
1509 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1510 				/* nop */ ;
1511 		}
1512 
1513 		if (current)
1514 			wattron(tabline, tab_face.current_tab);
1515 		else
1516 			wattron(tabline, tab_face.tab);
1517 
1518 		wprintw(tabline, "%s", buf);
1519 		if (TAILQ_NEXT(tab, tabs) != NULL)
1520 			wprintw(tabline, " ");
1521 
1522 		if (current)
1523 			wattroff(tabline, tab_face.current_tab);
1524 		else
1525 			wattroff(tabline, tab_face.tab);
1526 	}
1527 
1528 	wattron(tabline, tab_face.background);
1529 	for (; x < (size_t)COLS; ++x)
1530 		waddch(tabline, ' ');
1531 	if (truncated)
1532 		mvwprintw(tabline, 0, COLS-1, ">");
1533 }
1534 
1535 static void
1536 redraw_window(WINDOW *win, int height, struct window *window)
1537 {
1538 	struct vline	*vl;
1539 	int		 l;
1540 
1541 	werase(win);
1542 
1543 	window->line_off = MIN(window->line_max-1, window->line_off);
1544 	if (TAILQ_EMPTY(&window->head))
1545 		return;
1546 
1547 	l = 0;
1548 	vl = nth_line(window, window->line_off);
1549 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1550 		wmove(win, l, 0);
1551 		print_vline(win, vl);
1552 		l++;
1553 		if (l == height)
1554 			break;
1555 	}
1556 
1557 	wmove(win, window->curs_y, window->curs_x);
1558 }
1559 
1560 static void
1561 redraw_help(void)
1562 {
1563 	redraw_window(help, help_lines, &helpwin);
1564 }
1565 
1566 static void
1567 redraw_body(struct tab *tab)
1568 {
1569 	redraw_window(body, body_lines, &tab->window);
1570 }
1571 
1572 static inline char
1573 trust_status_char(enum trust_state ts)
1574 {
1575 	switch (ts) {
1576 	case TS_UNKNOWN:	return 'u';
1577 	case TS_UNTRUSTED:	return '!';
1578 	case TS_TRUSTED:	return 'v';
1579 	case TS_VERIFIED:	return 'V';
1580 	}
1581 }
1582 
1583 static void
1584 redraw_modeline(struct tab *tab)
1585 {
1586 	double		 pct;
1587 	int		 x, y, max_x, max_y;
1588 	const char	*mode = tab->window.page.name;
1589 	const char	*spin = "-\\|/";
1590 
1591 	werase(modeline);
1592 	wattron(modeline, A_REVERSE);
1593 	wmove(modeline, 0, 0);
1594 
1595 	wprintw(modeline, "-%c%c %s ",
1596 	    spin[tab->loading_anim_step],
1597 	    trust_status_char(tab->trust),
1598 	    mode == NULL ? "(none)" : mode);
1599 
1600 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1601 
1602 	if (tab->window.line_max <= (size_t)body_lines)
1603                 wprintw(modeline, "All ");
1604 	else if (tab->window.line_off == 0)
1605                 wprintw(modeline, "Top ");
1606 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1607 		wprintw(modeline, "Bottom ");
1608 	else
1609 		wprintw(modeline, "%.0f%% ", pct);
1610 
1611 	wprintw(modeline, "%d/%d %s ",
1612 	    tab->window.line_off + tab->window.curs_y,
1613 	    tab->window.line_max,
1614 	    tab->hist_cur->h);
1615 
1616 	getyx(modeline, y, x);
1617 	getmaxyx(modeline, max_y, max_x);
1618 
1619 	(void)y;
1620 	(void)max_y;
1621 
1622 	for (; x < max_x; ++x)
1623 		waddstr(modeline, "-");
1624 }
1625 
1626 static void
1627 redraw_minibuffer(void)
1628 {
1629 	struct tab *tab;
1630 	size_t off_y, off_x = 0;
1631 	char *start, *c;
1632 
1633 	werase(minibuf);
1634 
1635 	if (in_minibuffer) {
1636 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1637 		if (ministate.hist_cur != NULL)
1638 			wprintw(minibuf, "(%zu/%zu) ",
1639 			    ministate.hist_off + 1,
1640 			    ministate.history->len);
1641 
1642 		getyx(minibuf, off_y, off_x);
1643 
1644 		start = ministate.hist_cur != NULL
1645 			? ministate.hist_cur->h
1646 			: ministate.buf;
1647 		c = utf8_nth(ministate.window.current_line->line,
1648 		    ministate.window.cpoff);
1649 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1650 			start = utf8_next_cp(start);
1651 		}
1652 
1653 		waddstr(minibuf, start);
1654 	}
1655 
1656 	if (ministate.curmesg != NULL)
1657                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1658 		    ministate.curmesg);
1659 
1660 	if (!in_minibuffer && ministate.curmesg == NULL)
1661 		waddstr(minibuf, keybuf);
1662 
1663 	/* If nothing else, show the URL at point */
1664 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1665 		tab = current_tab();
1666 		if (tab->window.current_line != NULL &&
1667 		    tab->window.current_line->parent->type == LINE_LINK)
1668 			waddstr(minibuf, tab->window.current_line->parent->alt);
1669 	}
1670 
1671 	if (in_minibuffer)
1672 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1673 }
1674 
1675 static void
1676 redraw_tab(struct tab *tab)
1677 {
1678 	if (side_window) {
1679 		redraw_help();
1680 		wnoutrefresh(help);
1681 	}
1682 
1683 	redraw_tabline();
1684 	redraw_body(tab);
1685 	redraw_modeline(tab);
1686 	redraw_minibuffer();
1687 
1688 	wnoutrefresh(tabline);
1689 	wnoutrefresh(modeline);
1690 
1691 	if (in_minibuffer) {
1692 		wnoutrefresh(body);
1693 		wnoutrefresh(minibuf);
1694 	} else {
1695 		wnoutrefresh(minibuf);
1696 		wnoutrefresh(body);
1697 	}
1698 
1699 	doupdate();
1700 }
1701 
1702 static void
1703 emit_help_item(char *prfx, void *fn)
1704 {
1705 	struct line	*l;
1706 	struct cmds	*cmd;
1707 
1708 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1709 		if (fn == cmd->fn)
1710 			break;
1711 	}
1712 	assert(cmd != NULL);
1713 
1714 	if ((l = calloc(1, sizeof(*l))) == NULL)
1715 		abort();
1716 
1717 	l->type = LINE_TEXT;
1718 	l->alt = NULL;
1719 
1720 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1721 
1722 	if (TAILQ_EMPTY(&helpwin.page.head))
1723 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1724 	else
1725 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1726 }
1727 
1728 static void
1729 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1730 {
1731 	struct keymap	*k;
1732 	char		 p[32];
1733 	const char	*kn;
1734 
1735 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1736 		strlcpy(p, prfx, sizeof(p));
1737 		if (*p != '\0')
1738 			strlcat(p, " ", sizeof(p));
1739 		if (k->meta)
1740 			strlcat(p, "M-", sizeof(p));
1741 		if ((kn = unkbd(k->key)) != NULL)
1742 			strlcat(p, kn, sizeof(p));
1743 		else
1744 			strlcat(p, keyname(k->key), sizeof(p));
1745 
1746 		if (k->fn == NULL)
1747 			rec_compute_help(&k->map, p, sizeof(p));
1748 		else
1749 			emit_help_item(p, k->fn);
1750 	}
1751 }
1752 
1753 static void
1754 recompute_help(void)
1755 {
1756 	char	p[32] = { 0 };
1757 
1758 	empty_vlist(&helpwin);
1759 	empty_linelist(&helpwin);
1760 	rec_compute_help(current_map, p, sizeof(p));
1761 	wrap_page(&helpwin, help_cols);
1762 }
1763 
1764 static void
1765 vmessage(const char *fmt, va_list ap)
1766 {
1767 	if (evtimer_pending(&clminibufev, NULL))
1768 		evtimer_del(&clminibufev);
1769 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1770 	evtimer_add(&clminibufev, &clminibufev_timer);
1771 
1772 	free(ministate.curmesg);
1773 
1774 	/* TODO: what to do if the allocation fails here? */
1775 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1776 		ministate.curmesg = NULL;
1777 
1778 	redraw_minibuffer();
1779 	if (in_minibuffer) {
1780 		wrefresh(body);
1781 		wrefresh(minibuf);
1782 	} else {
1783 		wrefresh(minibuf);
1784 		wrefresh(body);
1785 	}
1786 }
1787 
1788 static void
1789 message(const char *fmt, ...)
1790 {
1791 	va_list ap;
1792 
1793 	va_start(ap, fmt);
1794 	vmessage(fmt, ap);
1795 	va_end(ap);
1796 }
1797 
1798 static void
1799 start_loading_anim(struct tab *tab)
1800 {
1801 	if (tab->loading_anim)
1802 		return;
1803 	tab->loading_anim = 1;
1804 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1805 	evtimer_add(&tab->loadingev, &loadingev_timer);
1806 }
1807 
1808 static void
1809 update_loading_anim(int fd, short ev, void *d)
1810 {
1811 	struct tab	*tab = d;
1812 
1813 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1814 
1815 	if (tab->flags & TAB_CURRENT) {
1816 		redraw_modeline(tab);
1817 		wrefresh(modeline);
1818 		wrefresh(body);
1819 		if (in_minibuffer)
1820 			wrefresh(minibuf);
1821 	}
1822 
1823 	evtimer_add(&tab->loadingev, &loadingev_timer);
1824 }
1825 
1826 static void
1827 stop_loading_anim(struct tab *tab)
1828 {
1829 	if (!tab->loading_anim)
1830 		return;
1831 	evtimer_del(&tab->loadingev);
1832 	tab->loading_anim = 0;
1833 	tab->loading_anim_step = 0;
1834 
1835 	if (!(tab->flags & TAB_CURRENT))
1836 		return;
1837 
1838 	redraw_modeline(tab);
1839 
1840 	wrefresh(modeline);
1841 	wrefresh(body);
1842 	if (in_minibuffer)
1843 		wrefresh(minibuf);
1844 }
1845 
1846 static void
1847 load_url_in_tab(struct tab *tab, const char *url)
1848 {
1849 	message("Loading %s...", url);
1850 	start_loading_anim(tab);
1851 	load_url(tab, url);
1852 
1853 	tab->window.curs_x = 0;
1854 	tab->window.curs_y = 0;
1855 	redraw_tab(tab);
1856 }
1857 
1858 static void
1859 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1860     void (*abortfn)(void), struct histhead *hist)
1861 {
1862 	in_minibuffer = 1;
1863 	base_map = &minibuffer_map;
1864 	current_map = &minibuffer_map;
1865 
1866 	base_map->unhandled_input = self_insert_fn;
1867 
1868 	ministate.donefn = donefn;
1869 	ministate.abortfn = abortfn;
1870 	memset(ministate.buf, 0, sizeof(ministate.buf));
1871 	ministate.window.current_line = &ministate.vline;
1872 	ministate.window.current_line->line = ministate.buf;
1873 	ministate.window.cpoff = 0;
1874 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1875 
1876 	ministate.history = hist;
1877 	ministate.hist_cur = NULL;
1878 	ministate.hist_off = 0;
1879 }
1880 
1881 static void
1882 exit_minibuffer(void)
1883 {
1884 	werase(minibuf);
1885 
1886 	in_minibuffer = 0;
1887 	base_map = &global_map;
1888 	current_map = &global_map;
1889 }
1890 
1891 static void
1892 switch_to_tab(struct tab *tab)
1893 {
1894 	struct tab	*t;
1895 
1896 	TAILQ_FOREACH(t, &tabshead, tabs) {
1897 		t->flags &= ~TAB_CURRENT;
1898 	}
1899 
1900 	tab->flags |= TAB_CURRENT;
1901 }
1902 
1903 unsigned int
1904 tab_new_id(void)
1905 {
1906 	return tab_counter++;
1907 }
1908 
1909 static struct tab *
1910 new_tab(const char *url)
1911 {
1912 	struct tab	*tab;
1913 
1914 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1915 		event_loopbreak();
1916 		return NULL;
1917 	}
1918 
1919 	TAILQ_INIT(&tab->hist.head);
1920 
1921 	TAILQ_INIT(&tab->window.head);
1922 
1923 	tab->id = tab_new_id();
1924 	switch_to_tab(tab);
1925 
1926 	if (TAILQ_EMPTY(&tabshead))
1927 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1928 	else
1929 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1930 
1931 	load_url_in_tab(tab, url);
1932 	return tab;
1933 }
1934 
1935 static void
1936 session_new_tab_cb(const char *url)
1937 {
1938 	new_tab(url);
1939 }
1940 
1941 static void
1942 usage(void)
1943 {
1944 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1945 }
1946 
1947 int
1948 ui_init(int argc, char * const *argv)
1949 {
1950 	const char *url = NEW_TAB_URL;
1951 	int ch;
1952 
1953 	while ((ch = getopt(argc, argv, "")) != -1) {
1954 		switch (ch) {
1955 		default:
1956 			usage();
1957 			return 0;
1958 		}
1959 	}
1960 	argc -= optind;
1961 	argv += optind;
1962 
1963 	if (argc != 0)
1964 		url = argv[0];
1965 
1966 	setlocale(LC_ALL, "");
1967 
1968 	TAILQ_INIT(&global_map.m);
1969 	global_map.unhandled_input = global_key_unbound;
1970 
1971 	TAILQ_INIT(&minibuffer_map.m);
1972 
1973 	TAILQ_INIT(&eecmd_history.head);
1974 	TAILQ_INIT(&ir_history.head);
1975 	TAILQ_INIT(&lu_history.head);
1976 
1977 	ministate.line.type = LINE_TEXT;
1978 	ministate.vline.parent = &ministate.line;
1979 	ministate.window.current_line = &ministate.vline;
1980 
1981 	/* initialize help window */
1982 	TAILQ_INIT(&helpwin.head);
1983 
1984 	base_map = &global_map;
1985 	current_map = &global_map;
1986 	load_default_keys();
1987 
1988 	initscr();
1989 	raw();
1990 	noecho();
1991 
1992 	nonl();
1993 	intrflush(stdscr, FALSE);
1994 
1995 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1996 		return 0;
1997 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1998 		return 0;
1999 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
2000 		return 0;
2001 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
2002 		return 0;
2003 	if ((help = newwin(1, 1, 1, 0)) == NULL)
2004 		return 0;
2005 
2006 	body_lines = LINES-3;
2007 	body_cols = COLS;
2008 
2009 	keypad(body, TRUE);
2010 	scrollok(body, TRUE);
2011 
2012 	/* non-blocking input */
2013 	wtimeout(body, 0);
2014 
2015 	mvwprintw(body, 0, 0, "");
2016 
2017 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
2018 	event_add(&stdioev, NULL);
2019 
2020 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
2021 	signal_add(&winchev, NULL);
2022 
2023 	load_last_session(session_new_tab_cb);
2024 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
2025 		new_tab(url);
2026 
2027 	return 1;
2028 }
2029 
2030 void
2031 ui_on_tab_loaded(struct tab *tab)
2032 {
2033 	stop_loading_anim(tab);
2034 	message("Loaded %s", tab->hist_cur->h);
2035 
2036 	redraw_tabline();
2037 	wrefresh(tabline);
2038 	if (in_minibuffer)
2039 		wrefresh(minibuf);
2040 	else
2041 		wrefresh(body);
2042 }
2043 
2044 void
2045 ui_on_tab_refresh(struct tab *tab)
2046 {
2047 	wrap_page(&tab->window, body_cols);
2048 	if (tab->flags & TAB_CURRENT) {
2049 		restore_cursor(&tab->window);
2050 		redraw_tab(tab);
2051 	}
2052 }
2053 
2054 void
2055 ui_require_input(struct tab *tab, int hide)
2056 {
2057 	/* TODO: hard-switching to another tab is ugly */
2058 	switch_to_tab(tab);
2059 
2060 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2061 	    &ir_history);
2062 	strlcpy(ministate.prompt, "Input required: ",
2063 	    sizeof(ministate.prompt));
2064 	redraw_tab(tab);
2065 }
2066 
2067 void
2068 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2069     unsigned int data)
2070 {
2071 	size_t len;
2072 
2073 	if (in_minibuffer) {
2074 		fn(0, data);
2075 		return;
2076 	}
2077 
2078 	yornp_cb = fn;
2079 	yornp_data = data;
2080 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2081 	    yornp_abort, NULL);
2082 
2083 	len = sizeof(ministate.prompt);
2084 	strlcpy(ministate.prompt, prompt, len);
2085 	strlcat(ministate.prompt, " (y or n) ", len);
2086 	redraw_tab(current_tab());
2087 }
2088 
2089 void
2090 ui_notify(const char *fmt, ...)
2091 {
2092 	va_list ap;
2093 
2094 	va_start(ap, fmt);
2095 	vmessage(fmt, ap);
2096 	va_end(ap);
2097 }
2098 
2099 void
2100 ui_end(void)
2101 {
2102 	endwin();
2103 }