op public repos

Blob

Date:: Fri Jun 11 10:30:23 2021 UTC
Message:: remove urgent flag during switch_to_tab when a tab is closed (C-t x 0) the previous one gets selected via switch_to_tab, but the TAB_URGENT flag is kept.
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 #include "cmd.gen.h"
37 
38 #include <assert.h>
39 #include <curses.h>
40 #include <event.h>
41 #include <locale.h>
42 #include <signal.h>
43 #include <stdarg.h>
44 #include <stdlib.h>
45 #include <string.h>
46 #include <unistd.h>
47 
48 #define TAB_CURRENT	0x1
49 #define TAB_URGENT	0x2
50 
51 #define NEW_TAB_URL	"about:new"
52 
53 static struct event	stdioev, winchev;
54 
55 static void		 load_default_keys(void);
56 static void		 restore_cursor(struct buffer*);
57 
58 static void		 global_key_unbound(void);
59 static void		 minibuffer_hist_save_entry(void);
60 static void		 minibuffer_taint_hist(void);
61 static void		 minibuffer_self_insert(void);
62 static void		 eecmd_self_insert(void);
63 static void		 eecmd_select(void);
64 static void		 ir_self_insert(void);
65 static void		 ir_select(void);
66 static void		 lu_self_insert(void);
67 static void		 lu_select(void);
68 static void		 bp_select(void);
69 static void		 yornp_self_insert(void);
70 static void		 yornp_abort(void);
71 static void		 read_self_insert(void);
72 static void		 read_abort(void);
73 static void		 read_select(void);
74 
75 static struct vline	*nth_line(struct buffer*, size_t);
76 static struct tab	*current_tab(void);
77 static struct buffer	*current_buffer(void);
78 static int		 readkey(void);
79 static void		 dispatch_stdio(int, short, void*);
80 static void		 handle_clear_minibuf(int, short, void*);
81 static void		 handle_resize(int, short, void*);
82 static void		 handle_resize_nodelay(int, short, void*);
83 static int		 wrap_page(struct buffer*, int);
84 static void		 print_vline(WINDOW*, struct vline*);
85 static void		 redraw_tabline(void);
86 static void		 redraw_window(WINDOW*, int, struct buffer*);
87 static void		 redraw_help(void);
88 static void		 redraw_body(struct tab*);
89 static void		 redraw_modeline(struct tab*);
90 static void		 redraw_minibuffer(void);
91 static void		 redraw_tab(struct tab*);
92 static void		 emit_help_item(char*, void*);
93 static void		 rec_compute_help(struct kmap*, char*, size_t);
94 static void		 recompute_help(void);
95 static void		 vmessage(const char*, va_list);
96 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
97 static void		 start_loading_anim(struct tab*);
98 static void		 update_loading_anim(int, short, void*);
99 static void		 stop_loading_anim(struct tab*);
100 static void		 load_url_in_tab(struct tab*, const char*);
101 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
102 static void		 exit_minibuffer(void);
103 static void		 switch_to_tab(struct tab*);
104 static struct tab	*new_tab(const char*);
105 static void		 session_new_tab_cb(const char*);
106 static void		 usage(void);
107 
108 static struct { short meta; int key; uint32_t cp; } thiskey;
109 
110 static struct event	resizeev;
111 static struct timeval	resize_timer = { 0, 250000 };
112 
113 static WINDOW	*tabline, *body, *modeline, *minibuf;
114 static int	 body_lines, body_cols;
115 
116 static WINDOW		*help;
117 static struct buffer	 helpwin;
118 static int		 help_lines, help_cols;
119 
120 static int		 side_window;
121 
122 static struct event	clminibufev;
123 static struct timeval	clminibufev_timer = { 5, 0 };
124 static struct timeval	loadingev_timer = { 0, 250000 };
125 
126 static uint32_t		 tab_counter;
127 
128 static char	keybuf[64];
129 
130 static void (*yornp_cb)(int, unsigned int);
131 static unsigned int yornp_data;
132 
133 static void (*read_cb)(const char*, unsigned int);
134 static unsigned int read_data;
135 
136 struct kmap global_map,
137 	minibuffer_map,
138 	*current_map,
139 	*base_map;
140 
141 static struct histhead eecmd_history,
142 	ir_history,
143 	lu_history,
144 	read_history;
145 
146 static int	in_minibuffer;
147 
148 static struct {
149 	char		*curmesg;
150 
151 	char		 prompt[64];
152 	void		 (*donefn)(void);
153 	void		 (*abortfn)(void);
154 
155 	char		 buf[1025];
156 	struct line	 line;
157 	struct vline	 vline;
158 	struct buffer	 buffer;
159 
160 	struct histhead	*history;
161 	struct hist	*hist_cur;
162 	size_t		 hist_off;
163 } ministate;
164 
165 struct lineprefix {
166 	const char	*prfx1;
167 	const char	*prfx2;
168 } line_prefixes[] = {
169 	[LINE_TEXT] =		{ "",		"" },
170 	[LINE_LINK] =		{ "=> ",	"   " },
171 	[LINE_TITLE_1] =	{ "# ",		"  " },
172 	[LINE_TITLE_2] =	{ "## ",	"   " },
173 	[LINE_TITLE_3] =	{ "### ",	"    " },
174 	[LINE_ITEM] =		{ "* ",		"  " },
175 	[LINE_QUOTE] =		{ "> ",		"  " },
176 	[LINE_PRE_START] =	{ "```",	"   " },
177 	[LINE_PRE_CONTENT] =	{ "",		"" },
178 	[LINE_PRE_END] =	{ "```",	"```" },
179 };
180 
181 static struct line_face {
182 	int prefix_prop;
183 	int text_prop;
184 } line_faces[] = {
185 	[LINE_TEXT] =		{ 0,		0 },
186 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
187 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
188 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
189 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
190 	[LINE_ITEM] =		{ 0,		0 },
191 	[LINE_QUOTE] =		{ 0,		A_DIM },
192 	[LINE_PRE_START] =	{ 0,		0 },
193 	[LINE_PRE_CONTENT] =	{ 0,		0 },
194 	[LINE_PRE_END] =	{ 0,		0 },
195 };
196 
197 static struct tab_face {
198 	int background, tab, current_tab;
199 } tab_face = {
200 	A_REVERSE, A_REVERSE, A_NORMAL
201 };
202 
203 static inline void
204 global_set_key(const char *key, void (*fn)(struct buffer*))
205 {
206 	if (!kmap_define_key(&global_map, key, fn))
207 		_exit(1);
208 }
209 
210 static inline void
211 minibuffer_set_key(const char *key, void (*fn)(struct buffer*))
212 {
213 	if (!kmap_define_key(&minibuffer_map, key, fn))
214 		_exit(1);
215 }
216 
217 static void
218 load_default_keys(void)
219 {
220 	/* === global map === */
221 
222 	/* emacs */
223 	global_set_key("C-p",		cmd_previous_line);
224 	global_set_key("C-n",		cmd_next_line);
225 	global_set_key("C-f",		cmd_forward_char);
226 	global_set_key("C-b",		cmd_backward_char);
227 	global_set_key("M-{",		cmd_backward_paragraph);
228 	global_set_key("M-}",		cmd_forward_paragraph);
229 	global_set_key("C-a",		cmd_move_beginning_of_line);
230 	global_set_key("C-e",		cmd_move_end_of_line);
231 
232 	global_set_key("M-v",		cmd_scroll_up);
233 	global_set_key("C-v",		cmd_scroll_down);
234 	global_set_key("M-space",	cmd_scroll_up);
235 	global_set_key("space",		cmd_scroll_down);
236 
237 	global_set_key("M-<",		cmd_beginning_of_buffer);
238 	global_set_key("M->",		cmd_end_of_buffer);
239 
240 	global_set_key("C-x C-c",	cmd_kill_telescope);
241 
242 	global_set_key("C-g",		cmd_clear_minibuf);
243 
244 	global_set_key("M-x",		cmd_execute_extended_command);
245 	global_set_key("C-x C-f",	cmd_load_url);
246 	global_set_key("C-x M-f",	cmd_load_current_url);
247 
248 	global_set_key("C-x t 0",	cmd_tab_close);
249 	global_set_key("C-x t 1",	cmd_tab_close_other);
250 	global_set_key("C-x t 2",	cmd_tab_new);
251 	global_set_key("C-x t o",	cmd_tab_next);
252 	global_set_key("C-x t O",	cmd_tab_previous);
253 	global_set_key("C-x t m",	cmd_tab_move);
254 	global_set_key("C-x t M",	cmd_tab_move_to);
255 
256 	global_set_key("C-M-b",		cmd_previous_page);
257 	global_set_key("C-M-f",		cmd_next_page);
258 
259 	global_set_key("<f7> a",	cmd_bookmark_page);
260 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
261 
262 	/* vi/vi-like */
263 	global_set_key("k",		cmd_previous_line);
264 	global_set_key("j",		cmd_next_line);
265 	global_set_key("l",		cmd_forward_char);
266 	global_set_key("h",		cmd_backward_char);
267 	global_set_key("{",		cmd_backward_paragraph);
268 	global_set_key("}",		cmd_forward_paragraph);
269 	global_set_key("^",		cmd_move_beginning_of_line);
270 	global_set_key("$",		cmd_move_end_of_line);
271 
272 	global_set_key("K",		cmd_scroll_line_up);
273 	global_set_key("J",		cmd_scroll_line_down);
274 
275 	global_set_key("g g",		cmd_beginning_of_buffer);
276 	global_set_key("G",		cmd_end_of_buffer);
277 
278 	global_set_key("g D",		cmd_tab_close);
279 	global_set_key("g N",		cmd_tab_new);
280 	global_set_key("g t",		cmd_tab_next);
281 	global_set_key("g T",		cmd_tab_previous);
282 	global_set_key("g M-t",		cmd_tab_move);
283 	global_set_key("g M-T",		cmd_tab_move_to);
284 
285 	global_set_key("H",		cmd_previous_page);
286 	global_set_key("L",		cmd_next_page);
287 
288 	/* tmp */
289 	global_set_key("q",		cmd_kill_telescope);
290 
291 	global_set_key("esc",		cmd_clear_minibuf);
292 
293 	global_set_key(":",		cmd_execute_extended_command);
294 
295 	/* cua */
296 	global_set_key("<up>",		cmd_previous_line);
297 	global_set_key("<down>",	cmd_next_line);
298 	global_set_key("<right>",	cmd_forward_char);
299 	global_set_key("<left>",	cmd_backward_char);
300 	global_set_key("<prior>",	cmd_scroll_up);
301 	global_set_key("<next>",	cmd_scroll_down);
302 
303 	global_set_key("M-<left>",	cmd_previous_page);
304 	global_set_key("M-<right>",	cmd_next_page);
305 
306 	/* "ncurses standard" */
307 	global_set_key("C-l",		cmd_redraw);
308 
309 	/* global */
310 	global_set_key("<f1>",		cmd_toggle_help);
311 	global_set_key("C-m",		cmd_push_button);
312 	global_set_key("M-enter",	cmd_push_button_new_tab);
313 	global_set_key("M-tab",		cmd_previous_button);
314 	global_set_key("tab",		cmd_next_button);
315 
316 	/* === minibuffer map === */
317 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
318 	minibuffer_set_key("C-g",		cmd_mini_abort);
319 	minibuffer_set_key("esc",		cmd_mini_abort);
320 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
321 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
322 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
323 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
324 
325 	minibuffer_set_key("C-b",		cmd_backward_char);
326 	minibuffer_set_key("C-f",		cmd_forward_char);
327 	minibuffer_set_key("<left>",		cmd_backward_char);
328 	minibuffer_set_key("<right>",		cmd_forward_char);
329 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
330 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
331 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
332 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
333 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
334 
335 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
336 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
337 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
338 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
339 }
340 
341 static void
342 restore_cursor(struct buffer *buffer)
343 {
344 	struct vline	*vl;
345 	const char	*prfx;
346 
347 	vl = buffer->current_line;
348 	if (vl == NULL || vl->line == NULL)
349 		buffer->curs_x = buffer->cpoff = 0;
350 	else
351 		buffer->curs_x = utf8_snwidth(vl->line, buffer->cpoff);
352 
353 	if (vl != NULL) {
354 		prfx = line_prefixes[vl->parent->type].prfx1;
355 		buffer->curs_x += utf8_swidth(prfx);
356 	}
357 }
358 
359 void
360 cmd_previous_line(struct buffer *buffer)
361 {
362 	struct vline	*vl;
363 
364 	if (buffer->current_line == NULL
365 	    || (vl = TAILQ_PREV(buffer->current_line, vhead, vlines)) == NULL)
366 		return;
367 
368 	if (--buffer->curs_y < 0) {
369 		buffer->curs_y = 0;
370 		cmd_scroll_line_up(buffer);
371 		return;
372 	}
373 
374 	buffer->current_line = vl;
375 	restore_cursor(buffer);
376 }
377 
378 void
379 cmd_next_line(struct buffer *buffer)
380 {
381 	struct vline	*vl;
382 
383 	if (buffer->current_line == NULL
384 	    || (vl = TAILQ_NEXT(buffer->current_line, vlines)) == NULL)
385 		return;
386 
387 	if (++buffer->curs_y > body_lines-1) {
388 		buffer->curs_y = body_lines-1;
389 		cmd_scroll_line_down(buffer);
390 		return;
391 	}
392 
393 	buffer->current_line = vl;
394 	restore_cursor(buffer);
395 }
396 
397 void
398 cmd_backward_char(struct buffer *buffer)
399 {
400 	if (buffer->cpoff != 0)
401 		buffer->cpoff--;
402 	restore_cursor(buffer);
403 }
404 
405 void
406 cmd_forward_char(struct buffer *buffer)
407 {
408 	size_t len = 0;
409 
410 	if (buffer->current_line->line != NULL)
411 		len = utf8_cplen(buffer->current_line->line);
412 	if (++buffer->cpoff > len)
413 		buffer->cpoff = len;
414 	restore_cursor(buffer);
415 }
416 
417 void
418 cmd_backward_paragraph(struct buffer *buffer)
419 {
420 	do {
421 		if (buffer->current_line == NULL ||
422 		    buffer->current_line == TAILQ_FIRST(&buffer->head)) {
423 			message("No previous paragraph");
424 			return;
425 		}
426 		cmd_previous_line(buffer);
427 	} while (buffer->current_line->line != NULL ||
428 	    buffer->current_line->parent->type != LINE_TEXT);
429 }
430 
431 void
432 cmd_forward_paragraph(struct buffer *buffer)
433 {
434 	do {
435 		if (buffer->current_line == NULL ||
436 		    buffer->current_line == TAILQ_LAST(&buffer->head, vhead)) {
437 			message("No next paragraph");
438 			return;
439 		}
440 		cmd_next_line(buffer);
441 	} while (buffer->current_line->line != NULL ||
442 	    buffer->current_line->parent->type != LINE_TEXT);
443 }
444 
445 void
446 cmd_move_beginning_of_line(struct buffer *buffer)
447 {
448 	buffer->cpoff = 0;
449 	restore_cursor(buffer);
450 }
451 
452 void
453 cmd_move_end_of_line(struct buffer *buffer)
454 {
455 	struct vline	*vl;
456 
457 	vl = buffer->current_line;
458 	if (vl->line == NULL)
459 		return;
460 	buffer->cpoff = utf8_cplen(vl->line);
461 	restore_cursor(buffer);
462 }
463 
464 void
465 cmd_redraw(struct buffer *buffer)
466 {
467 	handle_resize(0, 0, NULL);
468 }
469 
470 void
471 cmd_scroll_line_up(struct buffer *buffer)
472 {
473 	struct vline	*vl;
474 
475 	if (buffer->line_off == 0)
476 		return;
477 
478 	vl = nth_line(buffer, --buffer->line_off);
479 	wscrl(body, -1);
480 	wmove(body, 0, 0);
481 	print_vline(body, vl);
482 
483 	buffer->current_line = TAILQ_PREV(buffer->current_line, vhead, vlines);
484 	restore_cursor(buffer);
485 }
486 
487 void
488 cmd_scroll_line_down(struct buffer *buffer)
489 {
490 	struct vline	*vl;
491 
492 	vl = buffer->current_line;
493 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
494 		return;
495 	buffer->current_line = vl;
496 
497 	buffer->line_off++;
498 	wscrl(body, 1);
499 
500 	if (buffer->line_max - buffer->line_off < (size_t)body_lines)
501 		return;
502 
503 	vl = nth_line(buffer, buffer->line_off + body_lines-1);
504 	wmove(body, body_lines-1, 0);
505 	print_vline(body, vl);
506 
507 	restore_cursor(buffer);
508 }
509 
510 void
511 cmd_scroll_up(struct buffer *buffer)
512 {
513 	size_t off;
514 
515 	off = body_lines-1;
516 
517 	for (; off > 0; --off)
518 		cmd_scroll_line_up(buffer);
519 }
520 
521 void
522 cmd_scroll_down(struct buffer *buffer)
523 {
524 	size_t off;
525 
526 	off = body_lines-1;
527 
528 	for (; off > 0; --off)
529 		cmd_scroll_line_down(buffer);
530 }
531 
532 void
533 cmd_beginning_of_buffer(struct buffer *buffer)
534 {
535 	buffer->current_line = TAILQ_FIRST(&buffer->head);
536 	buffer->line_off = 0;
537 	buffer->curs_y = 0;
538 	buffer->cpoff = 0;
539 	restore_cursor(buffer);
540 }
541 
542 void
543 cmd_end_of_buffer(struct buffer *buffer)
544 {
545 	ssize_t off;
546 
547 	off = buffer->line_max - body_lines;
548 	off = MAX(0, off);
549 
550 	buffer->line_off = off;
551 	buffer->curs_y = MIN((size_t)body_lines, buffer->line_max-1);
552 
553 	buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
554 	buffer->cpoff = body_cols;
555 	restore_cursor(buffer);
556 }
557 
558 void
559 cmd_kill_telescope(struct buffer *buffer)
560 {
561 	save_session();
562 	event_loopbreak();
563 }
564 
565 void
566 cmd_push_button(struct buffer *buffer)
567 {
568 	struct vline	*vl;
569 	size_t		 nth;
570 
571 	nth = buffer->line_off + buffer->curs_y;
572 	if (nth >= buffer->line_max)
573 		return;
574 	vl = nth_line(buffer, nth);
575 	if (vl->parent->type != LINE_LINK)
576 		return;
577 
578 	load_url_in_tab(current_tab(), vl->parent->alt);
579 }
580 
581 void
582 cmd_push_button_new_tab(struct buffer *buffer)
583 {
584 	struct vline	*vl;
585 	size_t		 nth;
586 
587 	nth = buffer->line_off + buffer->curs_y;
588 	if (nth > buffer->line_max)
589 		return;
590 	vl = nth_line(buffer, nth);
591 	if (vl->parent->type != LINE_LINK)
592 		return;
593 
594 	new_tab(vl->parent->alt);
595 }
596 
597 void
598 cmd_previous_button(struct buffer *buffer)
599 {
600 	do {
601 		if (buffer->current_line == NULL ||
602 		    buffer->current_line == TAILQ_FIRST(&buffer->head)) {
603 			message("No previous link");
604 			return;
605 		}
606 		cmd_previous_line(buffer);
607 	} while (buffer->current_line->parent->type != LINE_LINK);
608 }
609 
610 void
611 cmd_next_button(struct buffer *buffer)
612 {
613 	do {
614 		if (buffer->current_line == NULL ||
615 		    buffer->current_line == TAILQ_LAST(&buffer->head, vhead)) {
616 			message("No next link");
617 			return;
618 		}
619 		cmd_next_line(buffer);
620 	} while (buffer->current_line->parent->type != LINE_LINK);
621 }
622 
623 void
624 cmd_previous_page(struct buffer *buffer)
625 {
626 	struct tab *tab = current_tab();
627 
628 	if (!load_previous_page(tab))
629 		message("No previous page");
630 	else
631 		start_loading_anim(tab);
632 }
633 
634 void
635 cmd_next_page(struct buffer *buffer)
636 {
637 	struct tab *tab = current_tab();
638 
639 	if (!load_next_page(tab))
640 		message("No next page");
641 	else
642 		start_loading_anim(tab);
643 }
644 
645 void
646 cmd_clear_minibuf(struct buffer *buffer)
647 {
648 	handle_clear_minibuf(0, 0, NULL);
649 }
650 
651 void
652 cmd_execute_extended_command(struct buffer *buffer)
653 {
654 	size_t	 len;
655 
656 	if (in_minibuffer) {
657 		message("We don't have enable-recursive-minibuffers");
658 		return;
659 	}
660 
661 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
662 	    &eecmd_history);
663 
664 	len = sizeof(ministate.prompt);
665 	strlcpy(ministate.prompt, "", len);
666 
667 	if (thiskey.meta)
668 		strlcat(ministate.prompt, "M-", len);
669 
670 	strlcat(ministate.prompt, keyname(thiskey.key), len);
671 
672 	if (thiskey.meta)
673 		strlcat(ministate.prompt, " ", len);
674 }
675 
676 void
677 cmd_tab_close(struct buffer *buffer)
678 {
679 	struct tab *tab, *t;
680 
681 	tab = current_tab();
682 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
683 	    TAILQ_NEXT(tab, tabs) == NULL) {
684 		message("Can't close the only tab.");
685 		return;
686 	}
687 
688 	if (evtimer_pending(&tab->loadingev, NULL))
689 		evtimer_del(&tab->loadingev);
690 
691 	stop_tab(tab);
692 
693 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
694 		t = TAILQ_NEXT(tab, tabs);
695 	TAILQ_REMOVE(&tabshead, tab, tabs);
696 	free(tab);
697 
698 	switch_to_tab(t);
699 }
700 
701 void
702 cmd_tab_close_other(struct buffer *buffer)
703 {
704 	struct tab *t, *i;
705 
706 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
707 		if (t->flags & TAB_CURRENT)
708 			continue;
709 
710 		stop_tab(t);
711 		TAILQ_REMOVE(&tabshead, t, tabs);
712 		free(t);
713 	}
714 }
715 
716 void
717 cmd_tab_new(struct buffer *buffer)
718 {
719 	new_tab(NEW_TAB_URL);
720 }
721 
722 void
723 cmd_tab_next(struct buffer *buffer)
724 {
725 	struct tab *tab, *t;
726 
727 	tab = current_tab();
728 	tab->flags &= ~TAB_CURRENT;
729 
730 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
731 		t = TAILQ_FIRST(&tabshead);
732 	t->flags |= TAB_CURRENT;
733 	t->flags &= ~TAB_URGENT;
734 }
735 
736 void
737 cmd_tab_previous(struct buffer *buffer)
738 {
739 	struct tab *tab, *t;
740 
741 	tab = current_tab();
742 	tab->flags &= ~TAB_CURRENT;
743 
744 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
745 		t = TAILQ_LAST(&tabshead, tabshead);
746 	t->flags |= TAB_CURRENT;
747 	t->flags &= ~TAB_URGENT;
748 }
749 
750 void
751 cmd_tab_move(struct buffer *buffer)
752 {
753 	struct tab *tab, *t;
754 
755 	tab = current_tab();
756 	t = TAILQ_NEXT(tab, tabs);
757 	TAILQ_REMOVE(&tabshead, tab, tabs);
758 
759 	if (t == NULL)
760 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
761 	else
762 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
763 }
764 
765 void
766 cmd_tab_move_to(struct buffer *buffer)
767 {
768 	struct tab *tab, *t;
769 
770 	tab = current_tab();
771 	t = TAILQ_PREV(tab, tabshead, tabs);
772 	TAILQ_REMOVE(&tabshead, tab, tabs);
773 
774 	if (t == NULL) {
775 		if (TAILQ_EMPTY(&tabshead))
776 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
777 		else
778 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
779 	} else
780 		TAILQ_INSERT_BEFORE(t, tab, tabs);
781 }
782 
783 void
784 cmd_load_url(struct buffer *buffer)
785 {
786 	if (in_minibuffer) {
787 		message("We don't have enable-recursive-minibuffers");
788 		return;
789 	}
790 
791 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
792 	    &lu_history);
793 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
794 	strlcpy(ministate.buf, "gemini://", sizeof(ministate.buf));
795 	cmd_move_end_of_line(&ministate.buffer);
796 }
797 
798 void
799 cmd_load_current_url(struct buffer *buffer)
800 {
801 	struct tab *tab = current_tab();
802 
803 	if (in_minibuffer) {
804 		message("We don't have enable-recursive-minibuffers");
805 		return;
806 	}
807 
808 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
809 	    &lu_history);
810 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
811 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
812 	ministate.buffer.cpoff = utf8_cplen(ministate.buf);
813 }
814 
815 void
816 cmd_bookmark_page(struct buffer *buffer)
817 {
818 	struct tab *tab = current_tab();
819 
820 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
821 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
822 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
823 	ministate.buffer.cpoff = utf8_cplen(ministate.buf);
824 }
825 
826 void
827 cmd_list_bookmarks(struct buffer *buffer)
828 {
829 	load_url_in_tab(current_tab(), "about:bookmarks");
830 }
831 
832 void
833 cmd_toggle_help(struct buffer *buffer)
834 {
835 	side_window = !side_window;
836 	if (side_window)
837 		recompute_help();
838 
839 	/*
840 	 * ugly hack, but otherwise the window doesn't get updated
841 	 * until I call handle_resize a second time (i.e. C-l).  I
842 	 * will be happy to know why something like this is needed.
843 	 */
844 	handle_resize_nodelay(0, 0, NULL);
845 	handle_resize_nodelay(0, 0, NULL);
846 }
847 
848 void
849 cmd_mini_delete_char(struct buffer *buffer)
850 {
851 	char *c, *n;
852 
853 	if (!in_minibuffer) {
854 		message("text is read-only");
855 		return;
856 	}
857 
858 	minibuffer_taint_hist();
859 
860 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
861 	if (*c == '\0')
862 		return;
863 	n = utf8_next_cp(c);
864 
865 	memmove(c, n, strlen(n)+1);
866 }
867 
868 void
869 cmd_mini_delete_backward_char(struct buffer *buffer)
870 {
871 	char *c, *p, *start;
872 
873 	if (!in_minibuffer) {
874 		message("text is read-only");
875 		return;
876 	}
877 
878 	minibuffer_taint_hist();
879 
880 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
881 	start = buffer->current_line->line;
882 	if (c == start)
883 		return;
884 	p = utf8_prev_cp(c-1, start);
885 
886 	memmove(p, c, strlen(c)+1);
887 	buffer->cpoff--;
888 }
889 
890 void
891 cmd_mini_kill_line(struct buffer *buffer)
892 {
893 	char *c;
894 
895 	if (!in_minibuffer) {
896 		message("text is read-only");
897 		return;
898 	}
899 
900 	minibuffer_taint_hist();
901 	c = utf8_nth(buffer->current_line->line, buffer->cpoff);
902 	*c = '\0';
903 }
904 
905 void
906 cmd_mini_abort(struct buffer *buffer)
907 {
908 	if (!in_minibuffer)
909 		return;
910 
911 	ministate.abortfn();
912 }
913 
914 void
915 cmd_mini_complete_and_exit(struct buffer *buffer)
916 {
917 	if (!in_minibuffer)
918 		return;
919 
920 	minibuffer_taint_hist();
921 	ministate.donefn();
922 }
923 
924 void
925 cmd_mini_previous_history_element(struct buffer *buffer)
926 {
927 	if (ministate.history == NULL) {
928 		message("No history");
929 		return;
930 	}
931 
932 	if (ministate.hist_cur == NULL ||
933 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
934 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
935 		ministate.hist_off = ministate.history->len - 1;
936 		if (ministate.hist_cur == NULL)
937 			message("No prev item");
938 	} else {
939 		ministate.hist_off--;
940 	}
941 
942 	if (ministate.hist_cur != NULL)
943 		buffer->current_line->line = ministate.hist_cur->h;
944 }
945 
946 void
947 cmd_mini_next_history_element(struct buffer *buffer)
948 {
949 	if (ministate.history == NULL) {
950 		message("No history");
951 		return;
952 	}
953 
954 	if (ministate.hist_cur == NULL ||
955 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
956 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
957 		ministate.hist_off = 0;
958 		if (ministate.hist_cur == NULL)
959 			message("No next item");
960 	} else {
961 		ministate.hist_off++;
962 	}
963 
964 	if (ministate.hist_cur != NULL)
965 		buffer->current_line->line = ministate.hist_cur->h;
966 }
967 
968 static void
969 global_key_unbound(void)
970 {
971 	message("%s is undefined", keybuf);
972 }
973 
974 static void
975 minibuffer_hist_save_entry(void)
976 {
977 	struct hist	*hist;
978 
979 	if (ministate.history == NULL)
980 		return;
981 
982 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
983 		abort();
984 
985 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
986 
987 	if (TAILQ_EMPTY(&ministate.history->head))
988 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
989 	else
990 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
991 	ministate.history->len++;
992 }
993 
994 /*
995  * taint the minibuffer cache: if we're currently showing a history
996  * element, copy that to the current buf and reset the "history
997  * navigation" thing.
998  */
999 static void
1000 minibuffer_taint_hist(void)
1001 {
1002 	if (ministate.hist_cur == NULL)
1003 		return;
1004 
1005 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1006 	ministate.hist_cur = NULL;
1007 }
1008 
1009 static void
1010 minibuffer_self_insert(void)
1011 {
1012 	char	*c, tmp[5] = {0};
1013 	size_t	len;
1014 
1015 	minibuffer_taint_hist();
1016 
1017 	if (thiskey.cp == 0)
1018 		return;
1019 
1020 	len = utf8_encode(thiskey.cp, tmp);
1021 	c = utf8_nth(ministate.buffer.current_line->line, ministate.buffer.cpoff);
1022 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1023 		return;
1024 
1025 	memmove(c + len, c, strlen(c)+1);
1026 	memcpy(c, tmp, len);
1027 	ministate.buffer.cpoff++;
1028 }
1029 
1030 static void
1031 eecmd_self_insert(void)
1032 {
1033 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1034 	    !unicode_isgraph(thiskey.cp)) {
1035 		global_key_unbound();
1036 		return;
1037 	}
1038 
1039 	minibuffer_self_insert();
1040 }
1041 
1042 static void
1043 eecmd_select(void)
1044 {
1045 	struct cmds *cmd;
1046 
1047 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1048 		if (!strcmp(cmd->cmd, ministate.buf)) {
1049 			exit_minibuffer();
1050 			minibuffer_hist_save_entry();
1051 			cmd->fn(current_buffer());
1052 			return;
1053 		}
1054 	}
1055 
1056 	message("No match");
1057 }
1058 
1059 static void
1060 ir_self_insert(void)
1061 {
1062 	minibuffer_self_insert();
1063 }
1064 
1065 static void
1066 ir_select(void)
1067 {
1068 	char		 buf[1025] = {0};
1069 	struct phos_uri	 uri;
1070 	struct tab	*tab;
1071 
1072 	tab = current_tab();
1073 
1074 	exit_minibuffer();
1075 	minibuffer_hist_save_entry();
1076 
1077 	/* a bit ugly but... */
1078 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1079 	phos_uri_set_query(&uri, ministate.buf);
1080 	phos_serialize_uri(&uri, buf, sizeof(buf));
1081 	load_url_in_tab(tab, buf);
1082 }
1083 
1084 static void
1085 lu_self_insert(void)
1086 {
1087 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1088 	    !unicode_isgraph(thiskey.key)) {
1089 		global_key_unbound();
1090 		return;
1091 	}
1092 
1093 	minibuffer_self_insert();
1094 }
1095 
1096 static void
1097 lu_select(void)
1098 {
1099 	exit_minibuffer();
1100 	minibuffer_hist_save_entry();
1101 	load_url_in_tab(current_tab(), ministate.buf);
1102 }
1103 
1104 static void
1105 bp_select(void)
1106 {
1107 	exit_minibuffer();
1108 	if (*ministate.buf != '\0')
1109 		add_to_bookmarks(ministate.buf);
1110 	else
1111 		message("Abort.");
1112 }
1113 
1114 static void
1115 yornp_self_insert(void)
1116 {
1117 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1118 		message("Please answer y or n");
1119 		return;
1120 	}
1121 
1122 	exit_minibuffer();
1123 	yornp_cb(thiskey.key == 'y', yornp_data);
1124 }
1125 
1126 static void
1127 yornp_abort(void)
1128 {
1129 	exit_minibuffer();
1130 	yornp_cb(0, yornp_data);
1131 }
1132 
1133 static void
1134 read_self_insert(void)
1135 {
1136 	if (thiskey.meta || !unicode_isgraph(thiskey.cp)) {
1137 		global_key_unbound();
1138 		return;
1139 	}
1140 
1141 	minibuffer_self_insert();
1142 }
1143 
1144 static void
1145 read_abort(void)
1146 {
1147 	exit_minibuffer();
1148 	read_cb(NULL, read_data);
1149 }
1150 
1151 static void
1152 read_select(void)
1153 {
1154         exit_minibuffer();
1155 	minibuffer_hist_save_entry();
1156 	read_cb(ministate.buf, read_data);
1157 }
1158 
1159 static struct vline *
1160 nth_line(struct buffer *buffer, size_t n)
1161 {
1162 	struct vline	*vl;
1163 	size_t		 i;
1164 
1165 	i = 0;
1166 	TAILQ_FOREACH(vl, &buffer->head, vlines) {
1167 		if (i == n)
1168 			return vl;
1169 		i++;
1170 	}
1171 
1172 	/* unreachable */
1173 	abort();
1174 }
1175 
1176 static struct tab *
1177 current_tab(void)
1178 {
1179 	struct tab *t;
1180 
1181 	TAILQ_FOREACH(t, &tabshead, tabs) {
1182 		if (t->flags & TAB_CURRENT)
1183 			return t;
1184 	}
1185 
1186 	/* unreachable */
1187 	abort();
1188 }
1189 
1190 static struct buffer *
1191 current_buffer(void)
1192 {
1193 	if (in_minibuffer)
1194 		return &ministate.buffer;
1195 	return &current_tab()->buffer;
1196 }
1197 
1198 static int
1199 readkey(void)
1200 {
1201 	uint32_t state = 0;
1202 
1203 	if ((thiskey.key = wgetch(body)) == ERR)
1204 		return 0;
1205 
1206 	thiskey.meta = thiskey.key == 27;
1207 	if (thiskey.meta) {
1208 		thiskey.key = wgetch(body);
1209 		if (thiskey.key == ERR || thiskey.key == 27) {
1210 			thiskey.meta = 0;
1211 			thiskey.key = 27;
1212 		}
1213 	}
1214 
1215 	thiskey.cp = 0;
1216 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1217 		while (1) {
1218 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1219 				break;
1220 			if ((thiskey.key = wgetch(body)) == ERR) {
1221 				message("Error decoding user input");
1222 				return 0;
1223 			}
1224 		}
1225 	}
1226 
1227 	return 1;
1228 }
1229 
1230 static void
1231 dispatch_stdio(int fd, short ev, void *d)
1232 {
1233 	struct keymap	*k;
1234 	const char	*keyname;
1235 	char		 tmp[5] = {0};
1236 
1237 	if (!readkey())
1238 		return;
1239 
1240 	if (keybuf[0] != '\0')
1241 		strlcat(keybuf, " ", sizeof(keybuf));
1242 	if (thiskey.meta)
1243 		strlcat(keybuf, "M-", sizeof(keybuf));
1244 	if (thiskey.cp != 0) {
1245 		utf8_encode(thiskey.cp, tmp);
1246 		strlcat(keybuf, tmp, sizeof(keybuf));
1247 	} else {
1248 		if ((keyname = unkbd(thiskey.key)) != NULL)
1249 			strlcat(keybuf, keyname, sizeof(keybuf));
1250 		else {
1251 			tmp[0] = thiskey.key;
1252 			strlcat(keybuf, tmp, sizeof(keybuf));
1253 		}
1254 	}
1255 
1256 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1257 		if (k->meta == thiskey.meta &&
1258 		    k->key == thiskey.key) {
1259 			if (k->fn == NULL)
1260 				current_map = &k->map;
1261 			else {
1262 				current_map = base_map;
1263 				strlcpy(keybuf, "", sizeof(keybuf));
1264 				k->fn(current_buffer());
1265 			}
1266 			goto done;
1267 		}
1268 	}
1269 
1270 	if (current_map->unhandled_input != NULL)
1271 		current_map->unhandled_input();
1272 	else {
1273 		global_key_unbound();
1274 	}
1275 
1276 	strlcpy(keybuf, "", sizeof(keybuf));
1277 	current_map = base_map;
1278 
1279 done:
1280 	if (side_window)
1281 		recompute_help();
1282 
1283 	redraw_tab(current_tab());
1284 }
1285 
1286 static void
1287 handle_clear_minibuf(int fd, short ev, void *d)
1288 {
1289 	free(ministate.curmesg);
1290 	ministate.curmesg = NULL;
1291 
1292 	redraw_minibuffer();
1293 	if (in_minibuffer) {
1294 		wrefresh(body);
1295 		wrefresh(minibuf);
1296 	} else {
1297 		wrefresh(minibuf);
1298 		wrefresh(body);
1299 	}
1300 }
1301 
1302 static void
1303 handle_resize(int sig, short ev, void *d)
1304 {
1305 	if (event_pending(&resizeev, EV_TIMEOUT, NULL)) {
1306 		event_del(&resizeev);
1307 	}
1308 	evtimer_set(&resizeev, handle_resize_nodelay, NULL);
1309 	evtimer_add(&resizeev, &resize_timer);
1310 }
1311 
1312 static void
1313 handle_resize_nodelay(int s, short ev, void *d)
1314 {
1315 	struct tab	*tab;
1316 
1317 	endwin();
1318 	refresh();
1319 	clear();
1320 
1321 	/* move and resize the windows, in reverse order! */
1322 
1323 	mvwin(minibuf, LINES-1, 0);
1324 	wresize(minibuf, 1, COLS);
1325 
1326 	mvwin(modeline, LINES-2, 0);
1327 	wresize(modeline, 1, COLS);
1328 
1329 	body_lines = LINES-3;
1330 	body_cols = COLS;
1331 
1332 	if (side_window) {
1333 		help_cols = 0.3 * COLS;
1334 		help_lines = LINES-3;
1335 		mvwin(help, 1, 0);
1336 		wresize(help, help_lines, help_cols);
1337 
1338 		wrap_page(&helpwin, help_cols);
1339 
1340 		body_cols = COLS - help_cols - 1;
1341 		mvwin(body, 1, help_cols);
1342 	} else
1343 		mvwin(body, 1, 0);
1344 
1345 	wresize(body, body_lines, body_cols);
1346 
1347 	wresize(tabline, 1, COLS);
1348 
1349 	tab = current_tab();
1350 
1351 	wrap_page(&tab->buffer, body_cols);
1352 	redraw_tab(tab);
1353 }
1354 
1355 static int
1356 wrap_page(struct buffer *buffer, int width)
1357 {
1358 	struct line		*l;
1359 	const struct line	*orig;
1360 	struct vline		*vl;
1361 	const char		*prfx;
1362 
1363 	orig = buffer->current_line == NULL
1364 		? NULL
1365 		: buffer->current_line->parent;
1366 	buffer->current_line = NULL;
1367 
1368 	buffer->curs_y = 0;
1369 	buffer->line_off = 0;
1370 
1371 	empty_vlist(buffer);
1372 
1373 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
1374 		prfx = line_prefixes[l->type].prfx1;
1375 		switch (l->type) {
1376 		case LINE_TEXT:
1377 		case LINE_LINK:
1378 		case LINE_TITLE_1:
1379 		case LINE_TITLE_2:
1380 		case LINE_TITLE_3:
1381 		case LINE_ITEM:
1382 		case LINE_QUOTE:
1383 		case LINE_PRE_START:
1384 		case LINE_PRE_END:
1385 			wrap_text(buffer, prfx, l, width);
1386 			break;
1387 		case LINE_PRE_CONTENT:
1388                         hardwrap_text(buffer, l, width);
1389 			break;
1390 		}
1391 
1392 		if (orig == l && buffer->current_line == NULL) {
1393 			buffer->line_off = buffer->line_max-1;
1394 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
1395 
1396 			while (1) {
1397 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
1398 				if (vl == NULL || vl->parent != orig)
1399 					break;
1400 				buffer->current_line = vl;
1401 				buffer->line_off--;
1402 			}
1403 		}
1404 	}
1405 
1406         if (buffer->current_line == NULL)
1407 		buffer->current_line = TAILQ_FIRST(&buffer->head);
1408 
1409 	return 1;
1410 }
1411 
1412 static void
1413 print_vline(WINDOW *window, struct vline *vl)
1414 {
1415 	const char *text = vl->line;
1416 	const char *prfx;
1417 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1418 	int text_face = line_faces[vl->parent->type].text_prop;
1419 
1420 	if (!vl->flags)
1421 		prfx = line_prefixes[vl->parent->type].prfx1;
1422 	else
1423 		prfx = line_prefixes[vl->parent->type].prfx2;
1424 
1425 	if (text == NULL)
1426 		text = "";
1427 
1428 	wattron(window, prefix_face);
1429 	wprintw(window, "%s", prfx);
1430 	wattroff(window, prefix_face);
1431 
1432 	wattron(window, text_face);
1433 	wprintw(window, "%s", text);
1434 	wattroff(window, text_face);
1435 }
1436 
1437 static void
1438 redraw_tabline(void)
1439 {
1440 	struct tab	*tab;
1441 	size_t		 toskip, ots, tabwidth, space, x;
1442 	int		 current, y, truncated;
1443 	const char	*title;
1444 	char		 buf[25];
1445 
1446 	tabwidth = sizeof(buf)+1;
1447 	space = COLS-2;
1448 
1449 	toskip = 0;
1450 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1451 		toskip++;
1452 		if (tab->flags & TAB_CURRENT)
1453 			break;
1454 	}
1455 
1456 	if (toskip * tabwidth < space)
1457 		toskip = 0;
1458 	else {
1459 		ots = toskip;
1460 		toskip--;
1461                 while (toskip != 0 &&
1462 		    (ots - toskip+1) * tabwidth < space)
1463 			toskip--;
1464 	}
1465 
1466 	werase(tabline);
1467 	wattron(tabline, tab_face.background);
1468 	wprintw(tabline, toskip == 0 ? " " : "<");
1469 	wattroff(tabline, tab_face.background);
1470 
1471 	truncated = 0;
1472 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1473 		if (truncated)
1474 			break;
1475 		if (toskip != 0) {
1476 			toskip--;
1477 			continue;
1478 		}
1479 
1480 		getyx(tabline, y, x);
1481 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1482 			truncated = 1;
1483 
1484 		current = tab->flags & TAB_CURRENT;
1485 
1486 		if (*(title = tab->buffer.page.title) == '\0')
1487 			title = tab->hist_cur->h;
1488 
1489 		if (tab->flags & TAB_URGENT)
1490 			strlcpy(buf, "!", sizeof(buf));
1491 		else
1492 			strlcpy(buf, " ", sizeof(buf));
1493 
1494                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1495 			/* truncation happens */
1496 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1497 		} else {
1498 			/* pad with spaces */
1499 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1500 				/* nop */ ;
1501 		}
1502 
1503 		if (current)
1504 			wattron(tabline, tab_face.current_tab);
1505 		else
1506 			wattron(tabline, tab_face.tab);
1507 
1508 		wprintw(tabline, "%s", buf);
1509 		if (TAILQ_NEXT(tab, tabs) != NULL)
1510 			wprintw(tabline, " ");
1511 
1512 		if (current)
1513 			wattroff(tabline, tab_face.current_tab);
1514 		else
1515 			wattroff(tabline, tab_face.tab);
1516 	}
1517 
1518 	wattron(tabline, tab_face.background);
1519 	for (; x < (size_t)COLS; ++x)
1520 		waddch(tabline, ' ');
1521 	if (truncated)
1522 		mvwprintw(tabline, 0, COLS-1, ">");
1523 }
1524 
1525 static void
1526 redraw_window(WINDOW *win, int height, struct buffer *buffer)
1527 {
1528 	struct vline	*vl;
1529 	int		 l;
1530 
1531 	werase(win);
1532 
1533 	buffer->line_off = MIN(buffer->line_max-1, buffer->line_off);
1534 	if (TAILQ_EMPTY(&buffer->head))
1535 		return;
1536 
1537 	l = 0;
1538 	vl = nth_line(buffer, buffer->line_off);
1539 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1540 		wmove(win, l, 0);
1541 		print_vline(win, vl);
1542 		l++;
1543 		if (l == height)
1544 			break;
1545 	}
1546 
1547 	wmove(win, buffer->curs_y, buffer->curs_x);
1548 }
1549 
1550 static void
1551 redraw_help(void)
1552 {
1553 	redraw_window(help, help_lines, &helpwin);
1554 }
1555 
1556 static void
1557 redraw_body(struct tab *tab)
1558 {
1559 	redraw_window(body, body_lines, &tab->buffer);
1560 }
1561 
1562 static inline char
1563 trust_status_char(enum trust_state ts)
1564 {
1565 	switch (ts) {
1566 	case TS_UNKNOWN:	return 'u';
1567 	case TS_UNTRUSTED:	return '!';
1568 	case TS_TRUSTED:	return 'v';
1569 	case TS_VERIFIED:	return 'V';
1570 	}
1571 }
1572 
1573 static void
1574 redraw_modeline(struct tab *tab)
1575 {
1576 	double		 pct;
1577 	int		 x, y, max_x, max_y;
1578 	const char	*mode = tab->buffer.page.name;
1579 	const char	*spin = "-\\|/";
1580 
1581 	werase(modeline);
1582 	wattron(modeline, A_REVERSE);
1583 	wmove(modeline, 0, 0);
1584 
1585 	wprintw(modeline, "-%c%c %s ",
1586 	    spin[tab->loading_anim_step],
1587 	    trust_status_char(tab->trust),
1588 	    mode == NULL ? "(none)" : mode);
1589 
1590 	pct = (tab->buffer.line_off + tab->buffer.curs_y) * 100.0 / tab->buffer.line_max;
1591 
1592 	if (tab->buffer.line_max <= (size_t)body_lines)
1593                 wprintw(modeline, "All ");
1594 	else if (tab->buffer.line_off == 0)
1595                 wprintw(modeline, "Top ");
1596 	else if (tab->buffer.line_off + body_lines >= tab->buffer.line_max)
1597 		wprintw(modeline, "Bottom ");
1598 	else
1599 		wprintw(modeline, "%.0f%% ", pct);
1600 
1601 	wprintw(modeline, "%d/%d %s ",
1602 	    tab->buffer.line_off + tab->buffer.curs_y,
1603 	    tab->buffer.line_max,
1604 	    tab->hist_cur->h);
1605 
1606 	getyx(modeline, y, x);
1607 	getmaxyx(modeline, max_y, max_x);
1608 
1609 	(void)y;
1610 	(void)max_y;
1611 
1612 	for (; x < max_x; ++x)
1613 		waddstr(modeline, "-");
1614 }
1615 
1616 static void
1617 redraw_minibuffer(void)
1618 {
1619 	struct tab *tab;
1620 	size_t off_y, off_x = 0;
1621 	char *start, *c;
1622 
1623 	werase(minibuf);
1624 
1625 	if (in_minibuffer) {
1626 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1627 		if (ministate.hist_cur != NULL)
1628 			wprintw(minibuf, "(%zu/%zu) ",
1629 			    ministate.hist_off + 1,
1630 			    ministate.history->len);
1631 
1632 		getyx(minibuf, off_y, off_x);
1633 
1634 		start = ministate.hist_cur != NULL
1635 			? ministate.hist_cur->h
1636 			: ministate.buf;
1637 		c = utf8_nth(ministate.buffer.current_line->line,
1638 		    ministate.buffer.cpoff);
1639 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1640 			start = utf8_next_cp(start);
1641 		}
1642 
1643 		waddstr(minibuf, start);
1644 	}
1645 
1646 	if (ministate.curmesg != NULL)
1647                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1648 		    ministate.curmesg);
1649 
1650 	if (!in_minibuffer && ministate.curmesg == NULL)
1651 		waddstr(minibuf, keybuf);
1652 
1653 	/* If nothing else, show the URL at point */
1654 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1655 		tab = current_tab();
1656 		if (tab->buffer.current_line != NULL &&
1657 		    tab->buffer.current_line->parent->type == LINE_LINK)
1658 			waddstr(minibuf, tab->buffer.current_line->parent->alt);
1659 	}
1660 
1661 	if (in_minibuffer)
1662 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1663 }
1664 
1665 static void
1666 redraw_tab(struct tab *tab)
1667 {
1668 	if (side_window) {
1669 		redraw_help();
1670 		wnoutrefresh(help);
1671 	}
1672 
1673 	redraw_tabline();
1674 	redraw_body(tab);
1675 	redraw_modeline(tab);
1676 	redraw_minibuffer();
1677 
1678 	wnoutrefresh(tabline);
1679 	wnoutrefresh(modeline);
1680 
1681 	if (in_minibuffer) {
1682 		wnoutrefresh(body);
1683 		wnoutrefresh(minibuf);
1684 	} else {
1685 		wnoutrefresh(minibuf);
1686 		wnoutrefresh(body);
1687 	}
1688 
1689 	doupdate();
1690 }
1691 
1692 static void
1693 emit_help_item(char *prfx, void *fn)
1694 {
1695 	struct line	*l;
1696 	struct cmds	*cmd;
1697 
1698 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1699 		if (fn == cmd->fn)
1700 			break;
1701 	}
1702 	assert(cmd != NULL);
1703 
1704 	if ((l = calloc(1, sizeof(*l))) == NULL)
1705 		abort();
1706 
1707 	l->type = LINE_TEXT;
1708 	l->alt = NULL;
1709 
1710 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1711 
1712 	if (TAILQ_EMPTY(&helpwin.page.head))
1713 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1714 	else
1715 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1716 }
1717 
1718 static void
1719 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1720 {
1721 	struct keymap	*k;
1722 	char		 p[32];
1723 	const char	*kn;
1724 
1725 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1726 		strlcpy(p, prfx, sizeof(p));
1727 		if (*p != '\0')
1728 			strlcat(p, " ", sizeof(p));
1729 		if (k->meta)
1730 			strlcat(p, "M-", sizeof(p));
1731 		if ((kn = unkbd(k->key)) != NULL)
1732 			strlcat(p, kn, sizeof(p));
1733 		else
1734 			strlcat(p, keyname(k->key), sizeof(p));
1735 
1736 		if (k->fn == NULL)
1737 			rec_compute_help(&k->map, p, sizeof(p));
1738 		else
1739 			emit_help_item(p, k->fn);
1740 	}
1741 }
1742 
1743 static void
1744 recompute_help(void)
1745 {
1746 	char	p[32] = { 0 };
1747 
1748 	empty_vlist(&helpwin);
1749 	empty_linelist(&helpwin);
1750 	rec_compute_help(current_map, p, sizeof(p));
1751 	wrap_page(&helpwin, help_cols);
1752 }
1753 
1754 static void
1755 vmessage(const char *fmt, va_list ap)
1756 {
1757 	if (evtimer_pending(&clminibufev, NULL))
1758 		evtimer_del(&clminibufev);
1759 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1760 	evtimer_add(&clminibufev, &clminibufev_timer);
1761 
1762 	free(ministate.curmesg);
1763 
1764 	/* TODO: what to do if the allocation fails here? */
1765 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1766 		ministate.curmesg = NULL;
1767 
1768 	redraw_minibuffer();
1769 	if (in_minibuffer) {
1770 		wrefresh(body);
1771 		wrefresh(minibuf);
1772 	} else {
1773 		wrefresh(minibuf);
1774 		wrefresh(body);
1775 	}
1776 }
1777 
1778 static void
1779 message(const char *fmt, ...)
1780 {
1781 	va_list ap;
1782 
1783 	va_start(ap, fmt);
1784 	vmessage(fmt, ap);
1785 	va_end(ap);
1786 }
1787 
1788 static void
1789 start_loading_anim(struct tab *tab)
1790 {
1791 	if (tab->loading_anim)
1792 		return;
1793 	tab->loading_anim = 1;
1794 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1795 	evtimer_add(&tab->loadingev, &loadingev_timer);
1796 }
1797 
1798 static void
1799 update_loading_anim(int fd, short ev, void *d)
1800 {
1801 	struct tab	*tab = d;
1802 
1803 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1804 
1805 	if (tab->flags & TAB_CURRENT) {
1806 		redraw_modeline(tab);
1807 		wrefresh(modeline);
1808 		wrefresh(body);
1809 		if (in_minibuffer)
1810 			wrefresh(minibuf);
1811 	}
1812 
1813 	evtimer_add(&tab->loadingev, &loadingev_timer);
1814 }
1815 
1816 static void
1817 stop_loading_anim(struct tab *tab)
1818 {
1819 	if (!tab->loading_anim)
1820 		return;
1821 	evtimer_del(&tab->loadingev);
1822 	tab->loading_anim = 0;
1823 	tab->loading_anim_step = 0;
1824 
1825 	if (!(tab->flags & TAB_CURRENT))
1826 		return;
1827 
1828 	redraw_modeline(tab);
1829 
1830 	wrefresh(modeline);
1831 	wrefresh(body);
1832 	if (in_minibuffer)
1833 		wrefresh(minibuf);
1834 }
1835 
1836 static void
1837 load_url_in_tab(struct tab *tab, const char *url)
1838 {
1839 	message("Loading %s...", url);
1840 	start_loading_anim(tab);
1841 	load_url(tab, url);
1842 
1843 	tab->buffer.curs_x = 0;
1844 	tab->buffer.curs_y = 0;
1845 	redraw_tab(tab);
1846 }
1847 
1848 static void
1849 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1850     void (*abortfn)(void), struct histhead *hist)
1851 {
1852 	in_minibuffer = 1;
1853 	base_map = &minibuffer_map;
1854 	current_map = &minibuffer_map;
1855 
1856 	base_map->unhandled_input = self_insert_fn;
1857 
1858 	ministate.donefn = donefn;
1859 	ministate.abortfn = abortfn;
1860 	memset(ministate.buf, 0, sizeof(ministate.buf));
1861 	ministate.buffer.current_line = &ministate.vline;
1862 	ministate.buffer.current_line->line = ministate.buf;
1863 	ministate.buffer.cpoff = 0;
1864 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1865 
1866 	ministate.history = hist;
1867 	ministate.hist_cur = NULL;
1868 	ministate.hist_off = 0;
1869 }
1870 
1871 static void
1872 exit_minibuffer(void)
1873 {
1874 	werase(minibuf);
1875 
1876 	in_minibuffer = 0;
1877 	base_map = &global_map;
1878 	current_map = &global_map;
1879 }
1880 
1881 static void
1882 switch_to_tab(struct tab *tab)
1883 {
1884 	struct tab	*t;
1885 
1886 	TAILQ_FOREACH(t, &tabshead, tabs) {
1887 		t->flags &= ~TAB_CURRENT;
1888 	}
1889 
1890 	tab->flags |= TAB_CURRENT;
1891 	tab->flags &= ~TAB_URGENT;
1892 }
1893 
1894 unsigned int
1895 tab_new_id(void)
1896 {
1897 	return tab_counter++;
1898 }
1899 
1900 static struct tab *
1901 new_tab(const char *url)
1902 {
1903 	struct tab	*tab;
1904 
1905 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1906 		event_loopbreak();
1907 		return NULL;
1908 	}
1909 	tab->fd = -1;
1910 
1911 	TAILQ_INIT(&tab->hist.head);
1912 
1913 	TAILQ_INIT(&tab->buffer.head);
1914 
1915 	tab->id = tab_new_id();
1916 	switch_to_tab(tab);
1917 
1918 	if (TAILQ_EMPTY(&tabshead))
1919 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1920 	else
1921 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1922 
1923 	load_url_in_tab(tab, url);
1924 	return tab;
1925 }
1926 
1927 static void
1928 session_new_tab_cb(const char *url)
1929 {
1930 	new_tab(url);
1931 }
1932 
1933 static void
1934 usage(void)
1935 {
1936 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1937 }
1938 
1939 int
1940 ui_init(int argc, char * const *argv)
1941 {
1942 	const char *url = NEW_TAB_URL;
1943 	int ch;
1944 
1945 	while ((ch = getopt(argc, argv, "")) != -1) {
1946 		switch (ch) {
1947 		default:
1948 			usage();
1949 			return 0;
1950 		}
1951 	}
1952 	argc -= optind;
1953 	argv += optind;
1954 
1955 	if (argc != 0)
1956 		url = argv[0];
1957 
1958 	setlocale(LC_ALL, "");
1959 
1960 	TAILQ_INIT(&global_map.m);
1961 	global_map.unhandled_input = global_key_unbound;
1962 
1963 	TAILQ_INIT(&minibuffer_map.m);
1964 
1965 	TAILQ_INIT(&eecmd_history.head);
1966 	TAILQ_INIT(&ir_history.head);
1967 	TAILQ_INIT(&lu_history.head);
1968 
1969 	ministate.line.type = LINE_TEXT;
1970 	ministate.vline.parent = &ministate.line;
1971 	ministate.buffer.current_line = &ministate.vline;
1972 
1973 	/* initialize help window */
1974 	TAILQ_INIT(&helpwin.head);
1975 
1976 	base_map = &global_map;
1977 	current_map = &global_map;
1978 	load_default_keys();
1979 
1980 	initscr();
1981 	raw();
1982 	noecho();
1983 
1984 	nonl();
1985 	intrflush(stdscr, FALSE);
1986 
1987 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1988 		return 0;
1989 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1990 		return 0;
1991 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1992 		return 0;
1993 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1994 		return 0;
1995 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1996 		return 0;
1997 
1998 	body_lines = LINES-3;
1999 	body_cols = COLS;
2000 
2001 	keypad(body, TRUE);
2002 	scrollok(body, TRUE);
2003 
2004 	/* non-blocking input */
2005 	wtimeout(body, 0);
2006 
2007 	mvwprintw(body, 0, 0, "");
2008 
2009 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
2010 	event_add(&stdioev, NULL);
2011 
2012 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
2013 	signal_add(&winchev, NULL);
2014 
2015 	load_last_session(session_new_tab_cb);
2016 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
2017 		new_tab(url);
2018 
2019 	return 1;
2020 }
2021 
2022 void
2023 ui_on_tab_loaded(struct tab *tab)
2024 {
2025 	stop_loading_anim(tab);
2026 	message("Loaded %s", tab->hist_cur->h);
2027 
2028 	redraw_tabline();
2029 	wrefresh(tabline);
2030 	if (in_minibuffer)
2031 		wrefresh(minibuf);
2032 	else
2033 		wrefresh(body);
2034 }
2035 
2036 void
2037 ui_on_tab_refresh(struct tab *tab)
2038 {
2039 	wrap_page(&tab->buffer, body_cols);
2040 	if (tab->flags & TAB_CURRENT) {
2041 		restore_cursor(&tab->buffer);
2042 		redraw_tab(tab);
2043 	} else
2044 		tab->flags |= TAB_URGENT;
2045 }
2046 
2047 void
2048 ui_require_input(struct tab *tab, int hide)
2049 {
2050 	/* TODO: hard-switching to another tab is ugly */
2051 	switch_to_tab(tab);
2052 
2053 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2054 	    &ir_history);
2055 	strlcpy(ministate.prompt, "Input required: ",
2056 	    sizeof(ministate.prompt));
2057 	redraw_tab(tab);
2058 }
2059 
2060 void
2061 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2062     unsigned int data)
2063 {
2064 	size_t len;
2065 
2066 	if (in_minibuffer) {
2067 		fn(0, data);
2068 		return;
2069 	}
2070 
2071 	yornp_cb = fn;
2072 	yornp_data = data;
2073 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2074 	    yornp_abort, NULL);
2075 
2076 	len = sizeof(ministate.prompt);
2077 	strlcpy(ministate.prompt, prompt, len);
2078 	strlcat(ministate.prompt, " (y or n) ", len);
2079 	redraw_tab(current_tab());
2080 }
2081 
2082 void
2083 ui_read(const char *prompt, void (*fn)(const char*, unsigned int),
2084     unsigned int data)
2085 {
2086 	size_t len;
2087 
2088 	if (in_minibuffer)
2089 		return;
2090 
2091 	read_cb = fn;
2092 	read_data = data;
2093 	enter_minibuffer(read_self_insert, read_select, read_abort,
2094 	    &read_history);
2095 
2096 	len = sizeof(ministate.prompt);
2097 	strlcpy(ministate.prompt, prompt, len);
2098 	strlcat(ministate.prompt, ": ", len);
2099 	redraw_tab(current_tab());
2100 }
2101 
2102 void
2103 ui_notify(const char *fmt, ...)
2104 {
2105 	va_list ap;
2106 
2107 	va_start(ap, fmt);
2108 	vmessage(fmt, ap);
2109 	va_end(ap);
2110 }
2111 
2112 void
2113 ui_end(void)
2114 {
2115 	endwin();
2116 }