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Date:: Sun Apr 25 18:51:24 2021 UTC
Message:: exit_minibuffer before calling yornp callback
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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 
58 CMD(cmd_previous_line);
59 CMD(cmd_next_line);
60 CMD(cmd_backward_char);
61 CMD(cmd_forward_char);
62 CMD(cmd_backward_paragraph);
63 CMD(cmd_forward_paragraph);
64 CMD(cmd_move_beginning_of_line);
65 CMD(cmd_move_end_of_line);
66 CMD(cmd_redraw);
67 CMD(cmd_scroll_line_down);
68 CMD(cmd_scroll_line_up);
69 CMD(cmd_scroll_up);
70 CMD(cmd_scroll_down);
71 CMD(cmd_beginning_of_buffer);
72 CMD(cmd_end_of_buffer);
73 CMD(cmd_kill_telescope);
74 CMD(cmd_push_button);
75 CMD(cmd_push_button_new_tab);
76 CMD(cmd_previous_button);
77 CMD(cmd_next_button);
78 CMD(cmd_previous_page);
79 CMD(cmd_next_page);
80 CMD(cmd_clear_minibuf);
81 CMD(cmd_execute_extended_command);
82 CMD(cmd_tab_close);
83 CMD(cmd_tab_close_other);
84 CMD(cmd_tab_new);
85 CMD(cmd_tab_next);
86 CMD(cmd_tab_previous);
87 CMD(cmd_tab_move);
88 CMD(cmd_tab_move_to);
89 CMD(cmd_load_url);
90 CMD(cmd_load_current_url);
91 CMD(cmd_bookmark_page);
92 CMD(cmd_list_bookmarks);
93 CMD(cmd_toggle_help);
94 
95 CMD(cmd_mini_delete_char);
96 CMD(cmd_mini_delete_backward_char);
97 CMD(cmd_mini_kill_line);
98 CMD(cmd_mini_abort);
99 CMD(cmd_mini_complete_and_exit);
100 CMD(cmd_mini_previous_history_element);
101 CMD(cmd_mini_next_history_element);
102 
103 #include "cmd.gen.h"
104 
105 static void		 global_key_unbound(void);
106 static void		 minibuffer_hist_save_entry(void);
107 static void		 minibuffer_taint_hist(void);
108 static void		 minibuffer_self_insert(void);
109 static void		 eecmd_self_insert(void);
110 static void		 eecmd_select(void);
111 static void		 ir_self_insert(void);
112 static void		 ir_select(void);
113 static void		 lu_self_insert(void);
114 static void		 lu_select(void);
115 static void		 bp_select(void);
116 static void		 yornp_self_insert(void);
117 static void		 yornp_abort(void);
118 
119 static struct vline	*nth_line(struct window*, size_t);
120 static struct tab	*current_tab(void);
121 static struct window	*current_window(void);
122 static int		 readkey(void);
123 static void		 dispatch_stdio(int, short, void*);
124 static void		 handle_clear_minibuf(int, short, void*);
125 static void		 handle_resize(int, short, void*);
126 static int		 wrap_page(struct window*, int);
127 static void		 print_vline(WINDOW*, struct vline*);
128 static void		 redraw_tabline(void);
129 static void		 redraw_window(WINDOW*, int, struct window*);
130 static void		 redraw_help(void);
131 static void		 redraw_body(struct tab*);
132 static void		 redraw_modeline(struct tab*);
133 static void		 redraw_minibuffer(void);
134 static void		 redraw_tab(struct tab*);
135 static void		 emit_help_item(char*, void*);
136 static void		 rec_compute_help(struct kmap*, char*, size_t);
137 static void		 recompute_help(void);
138 static void		 vmessage(const char*, va_list);
139 static void		 message(const char*, ...) __attribute__((format(printf, 1, 2)));
140 static void		 start_loading_anim(struct tab*);
141 static void		 update_loading_anim(int, short, void*);
142 static void		 stop_loading_anim(struct tab*);
143 static void		 load_url_in_tab(struct tab*, const char*);
144 static void		 enter_minibuffer(void(*)(void), void(*)(void), void(*)(void), struct histhead*);
145 static void		 exit_minibuffer(void);
146 static void		 switch_to_tab(struct tab*);
147 static struct tab	*new_tab(const char*);
148 static void		 session_new_tab_cb(const char*);
149 static void		 usage(void);
150 
151 static struct { short meta; int key; uint32_t cp; } thiskey;
152 
153 static WINDOW	*tabline, *body, *modeline, *minibuf;
154 static int	 body_lines, body_cols;
155 
156 static WINDOW		*help;
157 static struct window	 helpwin;
158 static int		 help_lines, help_cols;
159 
160 static int		 side_window;
161 
162 static struct event	clminibufev;
163 static struct timeval	clminibufev_timer = { 5, 0 };
164 static struct timeval	loadingev_timer = { 0, 250000 };
165 
166 static uint32_t		 tab_counter;
167 
168 static char	keybuf[64];
169 
170 static void (*yornp_cb)(int, unsigned int);
171 static unsigned int yornp_data;
172 
173 struct kmap global_map,
174 	minibuffer_map,
175 	*current_map,
176 	*base_map;
177 
178 static struct histhead eecmd_history,
179 	ir_history,
180 	lu_history;
181 
182 static int	in_minibuffer;
183 
184 static struct {
185 	char		*curmesg;
186 
187 	char		 prompt[64];
188 	void		 (*donefn)(void);
189 	void		 (*abortfn)(void);
190 
191 	char		 buf[1025];
192 	struct line	 line;
193 	struct vline	 vline;
194 	struct window	 window;
195 
196 	struct histhead	*history;
197 	struct hist	*hist_cur;
198 	size_t		 hist_off;
199 } ministate;
200 
201 struct lineprefix {
202 	const char	*prfx1;
203 	const char	*prfx2;
204 } line_prefixes[] = {
205 	[LINE_TEXT] =		{ "",		"" },
206 	[LINE_LINK] =		{ "=> ",	"   " },
207 	[LINE_TITLE_1] =	{ "# ",		"  " },
208 	[LINE_TITLE_2] =	{ "## ",	"   " },
209 	[LINE_TITLE_3] =	{ "### ",	"    " },
210 	[LINE_ITEM] =		{ "* ",		"  " },
211 	[LINE_QUOTE] =		{ "> ",		"  " },
212 	[LINE_PRE_START] =	{ "```",	"   " },
213 	[LINE_PRE_CONTENT] =	{ "",		"" },
214 	[LINE_PRE_END] =	{ "```",	"```" },
215 };
216 
217 static struct line_face {
218 	int prefix_prop;
219 	int text_prop;
220 } line_faces[] = {
221 	[LINE_TEXT] =		{ 0,		0 },
222 	[LINE_LINK] =		{ 0,		A_UNDERLINE },
223 	[LINE_TITLE_1] =	{ A_BOLD,	A_BOLD },
224 	[LINE_TITLE_2] =	{ A_BOLD,	A_BOLD },
225 	[LINE_TITLE_3] =	{ A_BOLD,	A_BOLD },
226 	[LINE_ITEM] =		{ 0,		0 },
227 	[LINE_QUOTE] =		{ 0,		A_DIM },
228 	[LINE_PRE_START] =	{ 0,		0 },
229 	[LINE_PRE_CONTENT] =	{ 0,		0 },
230 	[LINE_PRE_END] =	{ 0,		0 },
231 };
232 
233 static struct tab_face {
234 	int background, tab, current_tab;
235 } tab_face = {
236 	A_REVERSE, A_REVERSE, A_NORMAL
237 };
238 
239 static inline void
240 global_set_key(const char *key, void (*fn)(struct window*))
241 {
242 	if (!kmap_define_key(&global_map, key, fn))
243 		_exit(1);
244 }
245 
246 static inline void
247 minibuffer_set_key(const char *key, void (*fn)(struct window*))
248 {
249 	if (!kmap_define_key(&minibuffer_map, key, fn))
250 		_exit(1);
251 }
252 
253 static void
254 load_default_keys(void)
255 {
256 	/* === global map === */
257 
258 	/* emacs */
259 	global_set_key("C-p",		cmd_previous_line);
260 	global_set_key("C-n",		cmd_next_line);
261 	global_set_key("C-f",		cmd_forward_char);
262 	global_set_key("C-b",		cmd_backward_char);
263 	global_set_key("M-{",		cmd_backward_paragraph);
264 	global_set_key("M-}",		cmd_forward_paragraph);
265 	global_set_key("C-a",		cmd_move_beginning_of_line);
266 	global_set_key("C-e",		cmd_move_end_of_line);
267 
268 	global_set_key("M-v",		cmd_scroll_up);
269 	global_set_key("C-v",		cmd_scroll_down);
270 	global_set_key("M-space",	cmd_scroll_up);
271 	global_set_key("space",		cmd_scroll_down);
272 
273 	global_set_key("M-<",		cmd_beginning_of_buffer);
274 	global_set_key("M->",		cmd_end_of_buffer);
275 
276 	global_set_key("C-x C-c",	cmd_kill_telescope);
277 
278 	global_set_key("C-g",		cmd_clear_minibuf);
279 
280 	global_set_key("M-x",		cmd_execute_extended_command);
281 	global_set_key("C-x C-f",	cmd_load_url);
282 	global_set_key("C-x M-f",	cmd_load_current_url);
283 
284 	global_set_key("C-x t 0",	cmd_tab_close);
285 	global_set_key("C-x t 1",	cmd_tab_close_other);
286 	global_set_key("C-x t 2",	cmd_tab_new);
287 	global_set_key("C-x t o",	cmd_tab_next);
288 	global_set_key("C-x t O",	cmd_tab_previous);
289 	global_set_key("C-x t m",	cmd_tab_move);
290 	global_set_key("C-x t M",	cmd_tab_move_to);
291 
292 	global_set_key("C-M-b",		cmd_previous_page);
293 	global_set_key("C-M-f",		cmd_next_page);
294 
295 	global_set_key("<f7> a",	cmd_bookmark_page);
296 	global_set_key("<f7> <f7>",	cmd_list_bookmarks);
297 
298 	/* vi/vi-like */
299 	global_set_key("k",		cmd_previous_line);
300 	global_set_key("j",		cmd_next_line);
301 	global_set_key("l",		cmd_forward_char);
302 	global_set_key("h",		cmd_backward_char);
303 	global_set_key("{",		cmd_backward_paragraph);
304 	global_set_key("}",		cmd_forward_paragraph);
305 	global_set_key("^",		cmd_move_beginning_of_line);
306 	global_set_key("$",		cmd_move_end_of_line);
307 
308 	global_set_key("K",		cmd_scroll_line_up);
309 	global_set_key("J",		cmd_scroll_line_down);
310 
311 	global_set_key("g g",		cmd_beginning_of_buffer);
312 	global_set_key("G",		cmd_end_of_buffer);
313 
314 	global_set_key("g D",		cmd_tab_close);
315 	global_set_key("g N",		cmd_tab_new);
316 	global_set_key("g t",		cmd_tab_next);
317 	global_set_key("g T",		cmd_tab_previous);
318 	global_set_key("g M-t",		cmd_tab_move);
319 	global_set_key("g M-T",		cmd_tab_move_to);
320 
321 	global_set_key("H",		cmd_previous_page);
322 	global_set_key("L",		cmd_next_page);
323 
324 	/* tmp */
325 	global_set_key("q",		cmd_kill_telescope);
326 
327 	global_set_key("esc",		cmd_clear_minibuf);
328 
329 	global_set_key(":",		cmd_execute_extended_command);
330 
331 	/* cua */
332 	global_set_key("<up>",		cmd_previous_line);
333 	global_set_key("<down>",	cmd_next_line);
334 	global_set_key("<right>",	cmd_forward_char);
335 	global_set_key("<left>",	cmd_backward_char);
336 	global_set_key("<prior>",	cmd_scroll_up);
337 	global_set_key("<next>",	cmd_scroll_down);
338 
339 	global_set_key("M-<left>",	cmd_previous_page);
340 	global_set_key("M-<right>",	cmd_next_page);
341 
342 	/* "ncurses standard" */
343 	global_set_key("C-l",		cmd_redraw);
344 
345 	/* global */
346 	global_set_key("<f1>",		cmd_toggle_help);
347 	global_set_key("C-m",		cmd_push_button);
348 	global_set_key("M-enter",	cmd_push_button_new_tab);
349 	global_set_key("M-tab",		cmd_previous_button);
350 	global_set_key("tab",		cmd_next_button);
351 
352 	/* === minibuffer map === */
353 	minibuffer_set_key("ret",		cmd_mini_complete_and_exit);
354 	minibuffer_set_key("C-g",		cmd_mini_abort);
355 	minibuffer_set_key("esc",		cmd_mini_abort);
356 	minibuffer_set_key("C-d",		cmd_mini_delete_char);
357 	minibuffer_set_key("del",		cmd_mini_delete_backward_char);
358 	minibuffer_set_key("backspace",		cmd_mini_delete_backward_char);
359 	minibuffer_set_key("C-h",		cmd_mini_delete_backward_char);
360 
361 	minibuffer_set_key("C-b",		cmd_backward_char);
362 	minibuffer_set_key("C-f",		cmd_forward_char);
363 	minibuffer_set_key("<left>",		cmd_backward_char);
364 	minibuffer_set_key("<right>",		cmd_forward_char);
365 	minibuffer_set_key("C-e",		cmd_move_end_of_line);
366 	minibuffer_set_key("C-a",		cmd_move_beginning_of_line);
367 	minibuffer_set_key("<end>",		cmd_move_end_of_line);
368 	minibuffer_set_key("<home>",		cmd_move_beginning_of_line);
369 	minibuffer_set_key("C-k",		cmd_mini_kill_line);
370 
371 	minibuffer_set_key("M-p",		cmd_mini_previous_history_element);
372 	minibuffer_set_key("M-n",		cmd_mini_next_history_element);
373 	minibuffer_set_key("<up>",		cmd_mini_previous_history_element);
374 	minibuffer_set_key("<down>",		cmd_mini_next_history_element);
375 }
376 
377 static void
378 restore_cursor(struct window *window)
379 {
380 	struct vline	*vl;
381 	const char	*prfx;
382 
383 	vl = window->current_line;
384 	if (vl == NULL || vl->line == NULL)
385 		window->curs_x = window->cpoff = 0;
386 	else
387 		window->curs_x = utf8_snwidth(vl->line, window->cpoff);
388 
389 	if (vl != NULL) {
390 		prfx = line_prefixes[vl->parent->type].prfx1;
391 		window->curs_x += utf8_swidth(prfx);
392 	}
393 }
394 
395 static void
396 cmd_previous_line(struct window *window)
397 {
398 	struct vline	*vl;
399 
400 	if (window->current_line == NULL
401 	    || (vl = TAILQ_PREV(window->current_line, vhead, vlines)) == NULL)
402 		return;
403 
404 	if (--window->curs_y < 0) {
405 		window->curs_y = 0;
406 		cmd_scroll_line_up(window);
407 		return;
408 	}
409 
410 	window->current_line = vl;
411 	restore_cursor(window);
412 }
413 
414 static void
415 cmd_next_line(struct window *window)
416 {
417 	struct vline	*vl;
418 
419 	if (window->current_line == NULL
420 	    || (vl = TAILQ_NEXT(window->current_line, vlines)) == NULL)
421 		return;
422 
423 	if (++window->curs_y > body_lines-1) {
424 		window->curs_y = body_lines-1;
425 		cmd_scroll_line_down(window);
426 		return;
427 	}
428 
429 	window->current_line = vl;
430 	restore_cursor(window);
431 }
432 
433 static void
434 cmd_backward_char(struct window *window)
435 {
436 	if (window->cpoff != 0)
437 		window->cpoff--;
438 	restore_cursor(window);
439 }
440 
441 static void
442 cmd_forward_char(struct window *window)
443 {
444 	window->cpoff++;
445 	restore_cursor(window);
446 }
447 
448 static void
449 cmd_backward_paragraph(struct window *window)
450 {
451 	do {
452 		if (window->current_line == NULL ||
453 		    window->current_line == TAILQ_FIRST(&window->head)) {
454 			message("No previous paragraph");
455 			return;
456 		}
457 		cmd_previous_line(window);
458 	} while (window->current_line->line != NULL ||
459 	    window->current_line->parent->type != LINE_TEXT);
460 }
461 
462 static void
463 cmd_forward_paragraph(struct window *window)
464 {
465 	do {
466 		if (window->current_line == NULL ||
467 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
468 			message("No next paragraph");
469 			return;
470 		}
471 		cmd_next_line(window);
472 	} while (window->current_line->line != NULL ||
473 	    window->current_line->parent->type != LINE_TEXT);
474 }
475 
476 static void
477 cmd_move_beginning_of_line(struct window *window)
478 {
479 	window->cpoff = 0;
480 	restore_cursor(window);
481 }
482 
483 static void
484 cmd_move_end_of_line(struct window *window)
485 {
486 	struct vline	*vl;
487 
488 	vl = window->current_line;
489 	if (vl->line == NULL)
490 		return;
491 	window->cpoff = utf8_cplen(vl->line);
492 	restore_cursor(window);
493 }
494 
495 static void
496 cmd_redraw(struct window *window)
497 {
498 	handle_resize(0, 0, NULL);
499 }
500 
501 static void
502 cmd_scroll_line_up(struct window *window)
503 {
504 	struct vline	*vl;
505 
506 	if (window->line_off == 0)
507 		return;
508 
509 	vl = nth_line(window, --window->line_off);
510 	wscrl(body, -1);
511 	wmove(body, 0, 0);
512 	print_vline(body, vl);
513 
514 	window->current_line = TAILQ_PREV(window->current_line, vhead, vlines);
515 	restore_cursor(window);
516 }
517 
518 static void
519 cmd_scroll_line_down(struct window *window)
520 {
521 	struct vline	*vl;
522 
523 	vl = window->current_line;
524 	if ((vl = TAILQ_NEXT(vl, vlines)) == NULL)
525 		return;
526 	window->current_line = vl;
527 
528 	window->line_off++;
529 	wscrl(body, 1);
530 
531 	if (window->line_max - window->line_off < (size_t)body_lines)
532 		return;
533 
534 	vl = nth_line(window, window->line_off + body_lines-1);
535 	wmove(body, body_lines-1, 0);
536 	print_vline(body, vl);
537 
538 	restore_cursor(window);
539 }
540 
541 static void
542 cmd_scroll_up(struct window *window)
543 {
544 	size_t off;
545 
546 	off = body_lines+1;
547 
548 	for (; off > 0; --off)
549 		cmd_scroll_line_up(window);
550 }
551 
552 static void
553 cmd_scroll_down(struct window *window)
554 {
555 	size_t off;
556 
557 	off = body_lines+1;
558 
559 	for (; off > 0; --off)
560 		cmd_scroll_line_down(window);
561 }
562 
563 static void
564 cmd_beginning_of_buffer(struct window *window)
565 {
566 	window->current_line = TAILQ_FIRST(&window->head);
567 	window->line_off = 0;
568 	window->curs_y = 0;
569 	window->cpoff = 0;
570 	restore_cursor(window);
571 }
572 
573 static void
574 cmd_end_of_buffer(struct window *window)
575 {
576 	ssize_t off;
577 
578 	off = window->line_max - body_lines;
579 	off = MAX(0, off);
580 
581 	window->line_off = off;
582 	window->curs_y = MIN((size_t)body_lines, window->line_max-1);
583 
584 	window->current_line = TAILQ_LAST(&window->head, vhead);
585 	window->cpoff = body_cols;
586 	restore_cursor(window);
587 }
588 
589 static void
590 cmd_kill_telescope(struct window *window)
591 {
592 	save_session();
593 	event_loopbreak();
594 }
595 
596 static void
597 cmd_push_button(struct window *window)
598 {
599 	struct vline	*vl;
600 	size_t		 nth;
601 
602 	nth = window->line_off + window->curs_y;
603 	if (nth >= window->line_max)
604 		return;
605 	vl = nth_line(window, nth);
606 	if (vl->parent->type != LINE_LINK)
607 		return;
608 
609 	load_url_in_tab(current_tab(), vl->parent->alt);
610 }
611 
612 static void
613 cmd_push_button_new_tab(struct window *window)
614 {
615 	struct vline	*vl;
616 	size_t		 nth;
617 
618 	nth = window->line_off + window->curs_y;
619 	if (nth > window->line_max)
620 		return;
621 	vl = nth_line(window, nth);
622 	if (vl->parent->type != LINE_LINK)
623 		return;
624 
625 	new_tab(vl->parent->alt);
626 }
627 
628 static void
629 cmd_previous_button(struct window *window)
630 {
631 	do {
632 		if (window->current_line == NULL ||
633 		    window->current_line == TAILQ_FIRST(&window->head)) {
634 			message("No previous link");
635 			return;
636 		}
637 		cmd_previous_line(window);
638 	} while (window->current_line->parent->type != LINE_LINK);
639 }
640 
641 static void
642 cmd_next_button(struct window *window)
643 {
644 	do {
645 		if (window->current_line == NULL ||
646 		    window->current_line == TAILQ_LAST(&window->head, vhead)) {
647 			message("No next link");
648 			return;
649 		}
650 		cmd_next_line(window);
651 	} while (window->current_line->parent->type != LINE_LINK);
652 }
653 
654 static void
655 cmd_previous_page(struct window *window)
656 {
657 	struct tab *tab = current_tab();
658 
659 	if (!load_previous_page(tab))
660 		message("No previous page");
661 	else
662 		start_loading_anim(tab);
663 }
664 
665 static void
666 cmd_next_page(struct window *window)
667 {
668 	struct tab *tab = current_tab();
669 
670 	if (!load_next_page(tab))
671 		message("No next page");
672 	else
673 		start_loading_anim(tab);
674 }
675 
676 static void
677 cmd_clear_minibuf(struct window *window)
678 {
679 	handle_clear_minibuf(0, 0, NULL);
680 }
681 
682 static void
683 cmd_execute_extended_command(struct window *window)
684 {
685 	size_t	 len;
686 
687 	if (in_minibuffer) {
688 		message("We don't have enable-recursive-minibuffers");
689 		return;
690 	}
691 
692 	enter_minibuffer(eecmd_self_insert, eecmd_select, exit_minibuffer,
693 	    &eecmd_history);
694 
695 	len = sizeof(ministate.prompt);
696 	strlcpy(ministate.prompt, "", len);
697 
698 	if (thiskey.meta)
699 		strlcat(ministate.prompt, "M-", len);
700 
701 	strlcat(ministate.prompt, keyname(thiskey.key), len);
702 	strlcat(ministate.prompt, " ", len);
703 }
704 
705 static void
706 cmd_tab_close(struct window *window)
707 {
708 	struct tab *tab, *t;
709 
710 	tab = current_tab();
711 	if (TAILQ_PREV(tab, tabshead, tabs) == NULL &&
712 	    TAILQ_NEXT(tab, tabs) == NULL) {
713 		message("Can't close the only tab.");
714 		return;
715 	}
716 
717 	if (evtimer_pending(&tab->loadingev, NULL))
718 		evtimer_del(&tab->loadingev);
719 
720 	stop_tab(tab);
721 
722 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
723 		t = TAILQ_NEXT(tab, tabs);
724 	TAILQ_REMOVE(&tabshead, tab, tabs);
725 	free(tab);
726 
727 	switch_to_tab(t);
728 }
729 
730 static void
731 cmd_tab_close_other(struct window *window)
732 {
733 	struct tab *t, *i;
734 
735 	TAILQ_FOREACH_SAFE(t, &tabshead, tabs, i) {
736 		if (t->flags & TAB_CURRENT)
737 			continue;
738 
739 		stop_tab(t);
740 		TAILQ_REMOVE(&tabshead, t, tabs);
741 		free(t);
742 	}
743 }
744 
745 static void
746 cmd_tab_new(struct window *window)
747 {
748 	new_tab(NEW_TAB_URL);
749 }
750 
751 static void
752 cmd_tab_next(struct window *window)
753 {
754 	struct tab *tab, *t;
755 
756 	tab = current_tab();
757 	tab->flags &= ~TAB_CURRENT;
758 
759 	if ((t = TAILQ_NEXT(tab, tabs)) == NULL)
760 		t = TAILQ_FIRST(&tabshead);
761 	t->flags |= TAB_CURRENT;
762 }
763 
764 static void
765 cmd_tab_previous(struct window *window)
766 {
767 	struct tab *tab, *t;
768 
769 	tab = current_tab();
770 	tab->flags &= ~TAB_CURRENT;
771 
772 	if ((t = TAILQ_PREV(tab, tabshead, tabs)) == NULL)
773 		t = TAILQ_LAST(&tabshead, tabshead);
774 	t->flags |= TAB_CURRENT;
775 }
776 
777 static void
778 cmd_tab_move(struct window *window)
779 {
780 	struct tab *tab, *t;
781 
782 	tab = current_tab();
783 	t = TAILQ_NEXT(tab, tabs);
784 	TAILQ_REMOVE(&tabshead, tab, tabs);
785 
786 	if (t == NULL)
787 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
788 	else
789 		TAILQ_INSERT_AFTER(&tabshead, t, tab, tabs);
790 }
791 
792 static void
793 cmd_tab_move_to(struct window *window)
794 {
795 	struct tab *tab, *t;
796 
797 	tab = current_tab();
798 	t = TAILQ_PREV(tab, tabshead, tabs);
799 	TAILQ_REMOVE(&tabshead, tab, tabs);
800 
801 	if (t == NULL) {
802 		if (TAILQ_EMPTY(&tabshead))
803 			TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
804 		else
805 			TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
806 	} else
807 		TAILQ_INSERT_BEFORE(t, tab, tabs);
808 }
809 
810 static void
811 cmd_load_url(struct window *window)
812 {
813 	if (in_minibuffer) {
814 		message("We don't have enable-recursive-minibuffers");
815 		return;
816 	}
817 
818 	enter_minibuffer(lu_self_insert, lu_select, exit_minibuffer,
819 	    &lu_history);
820 	strlcpy(ministate.prompt, "Load URL: ", sizeof(ministate.prompt));
821 }
822 
823 static void
824 cmd_load_current_url(struct window *window)
825 {
826 	struct tab *tab = current_tab();
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, tab->hist_cur->h, sizeof(ministate.buf));
837 	ministate.window.cpoff = utf8_cplen(ministate.buf);
838 }
839 
840 static void
841 cmd_bookmark_page(struct window *window)
842 {
843 	struct tab *tab = current_tab();
844 
845 	enter_minibuffer(lu_self_insert, bp_select, exit_minibuffer, NULL);
846 	strlcpy(ministate.prompt, "Bookmark URL: ", sizeof(ministate.prompt));
847 	strlcpy(ministate.buf, tab->hist_cur->h, sizeof(ministate.buf));
848 	ministate.window.cpoff = utf8_cplen(ministate.buf);
849 }
850 
851 static void
852 cmd_list_bookmarks(struct window *window)
853 {
854 	load_url_in_tab(current_tab(), "about:bookmarks");
855 }
856 
857 static void
858 cmd_toggle_help(struct window *window)
859 {
860 	side_window = !side_window;
861 	if (side_window)
862 		recompute_help();
863 
864 	/* ugly hack, but otherwise the window doesn't get updated
865 	 * until I call handle_resize a second time (i.e. C-l).  I
866 	 * will be happy to know why something like this is needed. */
867 	handle_resize(0, 0, NULL);
868 	handle_resize(0, 0, NULL);
869 }
870 
871 static void
872 cmd_mini_delete_char(struct window *window)
873 {
874 	char *c, *n;
875 
876 	if (!in_minibuffer) {
877 		message("text is read-only");
878 		return;
879 	}
880 
881 	minibuffer_taint_hist();
882 
883 	c = utf8_nth(window->current_line->line, window->cpoff);
884 	if (*c == '\0')
885 		return;
886 	n = utf8_next_cp(c);
887 
888 	memmove(c, n, strlen(n)+1);
889 }
890 
891 static void
892 cmd_mini_delete_backward_char(struct window *window)
893 {
894 	char *c, *p, *start;
895 
896 	if (!in_minibuffer) {
897 		message("text is read-only");
898 		return;
899 	}
900 
901 	minibuffer_taint_hist();
902 
903 	c = utf8_nth(window->current_line->line, window->cpoff);
904 	start = window->current_line->line;
905 	if (c == start)
906 		return;
907 	p = utf8_prev_cp(c-1, start);
908 
909 	memmove(p, c, strlen(c)+1);
910 	window->cpoff--;
911 }
912 
913 static void
914 cmd_mini_kill_line(struct window *window)
915 {
916 	char *c;
917 
918 	if (!in_minibuffer) {
919 		message("text is read-only");
920 		return;
921 	}
922 
923 	minibuffer_taint_hist();
924 	c = utf8_nth(window->current_line->line, window->cpoff);
925 	*c = '\0';
926 }
927 
928 static void
929 cmd_mini_abort(struct window *window)
930 {
931 	if (!in_minibuffer)
932 		return;
933 
934 	ministate.abortfn();
935 }
936 
937 static void
938 cmd_mini_complete_and_exit(struct window *window)
939 {
940 	if (!in_minibuffer)
941 		return;
942 
943 	minibuffer_taint_hist();
944 	ministate.donefn();
945 }
946 
947 static void
948 cmd_mini_previous_history_element(struct window *window)
949 {
950 	if (ministate.history == NULL) {
951 		message("No history");
952 		return;
953 	}
954 
955 	if (ministate.hist_cur == NULL ||
956 	    (ministate.hist_cur = TAILQ_PREV(ministate.hist_cur, mhisthead, entries)) == NULL) {
957 		ministate.hist_cur = TAILQ_LAST(&ministate.history->head, mhisthead);
958 		ministate.hist_off = ministate.history->len - 1;
959 		if (ministate.hist_cur == NULL)
960 			message("No prev item");
961 	} else {
962 		ministate.hist_off--;
963 	}
964 
965 	if (ministate.hist_cur != NULL)
966 		window->current_line->line = ministate.hist_cur->h;
967 }
968 
969 static void
970 cmd_mini_next_history_element(struct window *window)
971 {
972 	if (ministate.history == NULL) {
973 		message("No history");
974 		return;
975 	}
976 
977 	if (ministate.hist_cur == NULL ||
978 	    (ministate.hist_cur = TAILQ_NEXT(ministate.hist_cur, entries)) == NULL) {
979 		ministate.hist_cur = TAILQ_FIRST(&ministate.history->head);
980 		ministate.hist_off = 0;
981 		if (ministate.hist_cur == NULL)
982 			message("No next item");
983 	} else {
984 		ministate.hist_off++;
985 	}
986 
987 	if (ministate.hist_cur != NULL)
988 		window->current_line->line = ministate.hist_cur->h;
989 }
990 
991 static void
992 global_key_unbound(void)
993 {
994 	message("%s is undefined", keybuf);
995 }
996 
997 static void
998 minibuffer_hist_save_entry(void)
999 {
1000 	struct hist	*hist;
1001 
1002 	if (ministate.history == NULL)
1003 		return;
1004 
1005 	if ((hist = calloc(1, sizeof(*hist))) == NULL)
1006 		abort();
1007 
1008 	strlcpy(hist->h, ministate.buf, sizeof(hist->h));
1009 
1010 	if (TAILQ_EMPTY(&ministate.history->head))
1011 		TAILQ_INSERT_HEAD(&ministate.history->head, hist, entries);
1012 	else
1013 		TAILQ_INSERT_TAIL(&ministate.history->head, hist, entries);
1014 	ministate.history->len++;
1015 }
1016 
1017 /*
1018  * taint the minibuffer cache: if we're currently showing a history
1019  * element, copy that to the current buf and reset the "history
1020  * navigation" thing.
1021  */
1022 static void
1023 minibuffer_taint_hist(void)
1024 {
1025 	if (ministate.hist_cur == NULL)
1026 		return;
1027 
1028 	strlcpy(ministate.buf, ministate.hist_cur->h, sizeof(ministate.buf));
1029 	ministate.hist_cur = NULL;
1030 }
1031 
1032 static void
1033 minibuffer_self_insert(void)
1034 {
1035 	char	*c, tmp[5] = {0};
1036 	size_t	len;
1037 
1038 	minibuffer_taint_hist();
1039 
1040 	if (thiskey.cp == 0)
1041 		return;
1042 
1043 	len = utf8_encode(thiskey.cp, tmp);
1044 	c = utf8_nth(ministate.window.current_line->line, ministate.window.cpoff);
1045 	if (c + len > ministate.buf + sizeof(ministate.buf) - 1)
1046 		return;
1047 
1048 	memmove(c + len, c, strlen(c)+1);
1049 	memcpy(c, tmp, len);
1050 	ministate.window.cpoff++;
1051 }
1052 
1053 static void
1054 eecmd_self_insert(void)
1055 {
1056 	if (thiskey.meta || unicode_isspace(thiskey.cp) ||
1057 	    !unicode_isgraph(thiskey.cp)) {
1058 		global_key_unbound();
1059 		return;
1060 	}
1061 
1062 	minibuffer_self_insert();
1063 }
1064 
1065 static void
1066 eecmd_select(void)
1067 {
1068 	struct cmds *cmd;
1069 
1070 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1071 		if (!strcmp(cmd->cmd, ministate.buf)) {
1072 			exit_minibuffer();
1073 			minibuffer_hist_save_entry();
1074 			cmd->fn(current_window());
1075 			return;
1076 		}
1077 	}
1078 
1079 	message("No match");
1080 }
1081 
1082 static void
1083 ir_self_insert(void)
1084 {
1085 	minibuffer_self_insert();
1086 }
1087 
1088 static void
1089 ir_select(void)
1090 {
1091 	char		 buf[1025] = {0};
1092 	struct phos_uri	 uri;
1093 	struct tab	*tab;
1094 
1095 	tab = current_tab();
1096 
1097 	exit_minibuffer();
1098 	minibuffer_hist_save_entry();
1099 
1100 	/* a bit ugly but... */
1101 	memcpy(&uri, &tab->uri, sizeof(tab->uri));
1102 	phos_uri_set_query(&uri, ministate.buf);
1103 	phos_serialize_uri(&uri, buf, sizeof(buf));
1104 	load_url_in_tab(tab, buf);
1105 }
1106 
1107 static void
1108 lu_self_insert(void)
1109 {
1110 	if (thiskey.meta || unicode_isspace(thiskey.key) ||
1111 	    !unicode_isgraph(thiskey.key)) {
1112 		global_key_unbound();
1113 		return;
1114 	}
1115 
1116 	minibuffer_self_insert();
1117 }
1118 
1119 static void
1120 lu_select(void)
1121 {
1122 	exit_minibuffer();
1123 	minibuffer_hist_save_entry();
1124 	load_url_in_tab(current_tab(), ministate.buf);
1125 }
1126 
1127 static void
1128 bp_select(void)
1129 {
1130 	exit_minibuffer();
1131 	if (*ministate.buf != '\0')
1132 		add_to_bookmarks(ministate.buf);
1133 	else
1134 		message("Abort.");
1135 }
1136 
1137 static void
1138 yornp_self_insert(void)
1139 {
1140 	if (thiskey.key != 'y' && thiskey.key != 'n') {
1141 		message("Please answer y or n");
1142 		return;
1143 	}
1144 
1145 	exit_minibuffer();
1146 	yornp_cb(thiskey.key == 'y', yornp_data);
1147 }
1148 
1149 static void
1150 yornp_abort(void)
1151 {
1152 	exit_minibuffer();
1153 	yornp_cb(0, yornp_data);
1154 }
1155 
1156 static struct vline *
1157 nth_line(struct window *window, size_t n)
1158 {
1159 	struct vline	*vl;
1160 	size_t		 i;
1161 
1162 	i = 0;
1163 	TAILQ_FOREACH(vl, &window->head, vlines) {
1164 		if (i == n)
1165 			return vl;
1166 		i++;
1167 	}
1168 
1169 	/* unreachable */
1170 	abort();
1171 }
1172 
1173 static struct tab *
1174 current_tab(void)
1175 {
1176 	struct tab *t;
1177 
1178 	TAILQ_FOREACH(t, &tabshead, tabs) {
1179 		if (t->flags & TAB_CURRENT)
1180 			return t;
1181 	}
1182 
1183 	/* unreachable */
1184 	abort();
1185 }
1186 
1187 static struct window *
1188 current_window(void)
1189 {
1190 	if (in_minibuffer)
1191 		return &ministate.window;
1192 	return &current_tab()->window;
1193 }
1194 
1195 static int
1196 readkey(void)
1197 {
1198 	uint32_t state = 0;
1199 
1200 	if ((thiskey.key = wgetch(body)) == ERR)
1201 		return 0;
1202 
1203 	thiskey.meta = thiskey.key == 27;
1204 	if (thiskey.meta) {
1205 		thiskey.key = wgetch(body);
1206 		if (thiskey.key == ERR || thiskey.key == 27) {
1207 			thiskey.meta = 0;
1208 			thiskey.key = 27;
1209 		}
1210 	}
1211 
1212 	thiskey.cp = 0;
1213 	if ((unsigned int)thiskey.key < UINT8_MAX) {
1214 		while (1) {
1215 			if (!utf8_decode(&state, &thiskey.cp, (uint8_t)thiskey.key))
1216 				break;
1217 			if ((thiskey.key = wgetch(body)) == ERR) {
1218 				message("Error decoding user input");
1219 				return 0;
1220 			}
1221 		}
1222 	}
1223 
1224 	return 1;
1225 }
1226 
1227 static void
1228 dispatch_stdio(int fd, short ev, void *d)
1229 {
1230 	struct keymap	*k;
1231 	const char	*keyname;
1232 	char		 tmp[5] = {0};
1233 
1234 	if (!readkey())
1235 		return;
1236 
1237 	if (keybuf[0] != '\0')
1238 		strlcat(keybuf, " ", sizeof(keybuf));
1239 	if (thiskey.meta)
1240 		strlcat(keybuf, "M-", sizeof(keybuf));
1241 	if (thiskey.cp != 0) {
1242 		utf8_encode(thiskey.cp, tmp);
1243 		strlcat(keybuf, tmp, sizeof(keybuf));
1244 	} else {
1245 		if ((keyname = unkbd(thiskey.key)) != NULL)
1246 			strlcat(keybuf, keyname, sizeof(keybuf));
1247 		else {
1248 			tmp[0] = thiskey.key;
1249 			strlcat(keybuf, tmp, sizeof(keybuf));
1250 		}
1251 	}
1252 
1253 	TAILQ_FOREACH(k, &current_map->m, keymaps) {
1254 		if (k->meta == thiskey.meta &&
1255 		    k->key == thiskey.key) {
1256 			if (k->fn == NULL)
1257 				current_map = &k->map;
1258 			else {
1259 				current_map = base_map;
1260 				strlcpy(keybuf, "", sizeof(keybuf));
1261 				k->fn(current_window());
1262 			}
1263 			goto done;
1264 		}
1265 	}
1266 
1267 	if (current_map->unhandled_input != NULL)
1268 		current_map->unhandled_input();
1269 	else {
1270 		global_key_unbound();
1271 	}
1272 
1273 	strlcpy(keybuf, "", sizeof(keybuf));
1274 	current_map = base_map;
1275 
1276 done:
1277 	if (side_window)
1278 		recompute_help();
1279 
1280 	redraw_tab(current_tab());
1281 }
1282 
1283 static void
1284 handle_clear_minibuf(int fd, short ev, void *d)
1285 {
1286 	free(ministate.curmesg);
1287 	ministate.curmesg = NULL;
1288 
1289 	redraw_minibuffer();
1290 	if (in_minibuffer) {
1291 		wrefresh(body);
1292 		wrefresh(minibuf);
1293 	} else {
1294 		wrefresh(minibuf);
1295 		wrefresh(body);
1296 	}
1297 }
1298 
1299 static void
1300 handle_resize(int sig, short ev, void *d)
1301 {
1302 	struct tab	*tab;
1303 
1304 	endwin();
1305 	refresh();
1306 	clear();
1307 
1308 	/* move and resize the windows, in reverse order! */
1309 
1310 	mvwin(minibuf, LINES-1, 0);
1311 	wresize(minibuf, 1, COLS);
1312 
1313 	mvwin(modeline, LINES-2, 0);
1314 	wresize(modeline, 1, COLS);
1315 
1316 	body_lines = LINES-3;
1317 	body_cols = COLS;
1318 
1319 	if (side_window) {
1320 		help_cols = 0.3 * COLS;
1321 		help_lines = LINES-3;
1322 		mvwin(help, 1, 0);
1323 		wresize(help, help_lines, help_cols);
1324 
1325 		wrap_page(&helpwin, help_cols);
1326 
1327 		body_cols = COLS - help_cols - 1;
1328 		mvwin(body, 1, help_cols);
1329 	} else
1330 		mvwin(body, 1, 0);
1331 
1332 	wresize(body, body_lines, body_cols);
1333 
1334 	wresize(tabline, 1, COLS);
1335 
1336 	tab = current_tab();
1337 
1338 	wrap_page(&tab->window, body_cols);
1339 	redraw_tab(tab);
1340 }
1341 
1342 static int
1343 wrap_page(struct window *window, int width)
1344 {
1345 	struct line		*l;
1346 	const struct line	*orig;
1347 	struct vline		*vl;
1348 	const char		*prfx;
1349 
1350 	orig = window->current_line == NULL
1351 		? NULL
1352 		: window->current_line->parent;
1353 	window->current_line = NULL;
1354 
1355 	window->curs_y = 0;
1356 	window->line_off = 0;
1357 
1358 	empty_vlist(window);
1359 
1360 	TAILQ_FOREACH(l, &window->page.head, lines) {
1361 		prfx = line_prefixes[l->type].prfx1;
1362 		switch (l->type) {
1363 		case LINE_TEXT:
1364 		case LINE_LINK:
1365 		case LINE_TITLE_1:
1366 		case LINE_TITLE_2:
1367 		case LINE_TITLE_3:
1368 		case LINE_ITEM:
1369 		case LINE_QUOTE:
1370 		case LINE_PRE_START:
1371 		case LINE_PRE_END:
1372 			wrap_text(window, prfx, l, width);
1373 			break;
1374 		case LINE_PRE_CONTENT:
1375                         hardwrap_text(window, l, width);
1376 			break;
1377 		}
1378 
1379 		if (orig == l && window->current_line == NULL) {
1380 			window->line_off = window->line_max-1;
1381 			window->current_line = TAILQ_LAST(&window->head, vhead);
1382 
1383 			while (1) {
1384 				vl = TAILQ_PREV(window->current_line, vhead, vlines);
1385 				if (vl == NULL || vl->parent != orig)
1386 					break;
1387 				window->current_line = vl;
1388 				window->line_off--;
1389 			}
1390 		}
1391 	}
1392 
1393         if (window->current_line == NULL)
1394 		window->current_line = TAILQ_FIRST(&window->head);
1395 
1396 	return 1;
1397 }
1398 
1399 static void
1400 print_vline(WINDOW *window, struct vline *vl)
1401 {
1402 	const char *text = vl->line;
1403 	const char *prfx;
1404 	int prefix_face = line_faces[vl->parent->type].prefix_prop;
1405 	int text_face = line_faces[vl->parent->type].text_prop;
1406 
1407 	if (!vl->flags)
1408 		prfx = line_prefixes[vl->parent->type].prfx1;
1409 	else
1410 		prfx = line_prefixes[vl->parent->type].prfx2;
1411 
1412 	if (text == NULL)
1413 		text = "";
1414 
1415 	wattron(window, prefix_face);
1416 	wprintw(window, "%s", prfx);
1417 	wattroff(window, prefix_face);
1418 
1419 	wattron(window, text_face);
1420 	wprintw(window, "%s", text);
1421 	wattroff(window, text_face);
1422 }
1423 
1424 static void
1425 redraw_tabline(void)
1426 {
1427 	struct tab	*tab;
1428 	size_t		 toskip, ots, tabwidth, space, x;
1429 	int		 current, y, truncated;
1430 	const char	*title;
1431 	char		 buf[25];
1432 
1433 	tabwidth = sizeof(buf)+1;
1434 	space = COLS-2;
1435 
1436 	toskip = 0;
1437 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1438 		toskip++;
1439 		if (tab->flags & TAB_CURRENT)
1440 			break;
1441 	}
1442 
1443 	if (toskip * tabwidth < space)
1444 		toskip = 0;
1445 	else {
1446 		ots = toskip;
1447 		toskip--;
1448                 while (toskip != 0 &&
1449 		    (ots - toskip+1) * tabwidth < space)
1450 			toskip--;
1451 	}
1452 
1453 	werase(tabline);
1454 	wattron(tabline, tab_face.background);
1455 	wprintw(tabline, toskip == 0 ? " " : "<");
1456 	wattroff(tabline, tab_face.background);
1457 
1458 	truncated = 0;
1459 	TAILQ_FOREACH(tab, &tabshead, tabs) {
1460 		if (truncated)
1461 			break;
1462 		if (toskip != 0) {
1463 			toskip--;
1464 			continue;
1465 		}
1466 
1467 		getyx(tabline, y, x);
1468 		if (x + sizeof(buf)+2 >= (size_t)COLS)
1469 			truncated = 1;
1470 
1471 		current = tab->flags & TAB_CURRENT;
1472 
1473 		if (*(title = tab->window.page.title) == '\0')
1474 			title = tab->hist_cur->h;
1475 
1476 		strlcpy(buf, " ", sizeof(buf));
1477                 if (strlcat(buf, title, sizeof(buf)) >= sizeof(buf)) {
1478 			/* truncation happens */
1479 			strlcpy(&buf[sizeof(buf)-4], "...", 4);
1480 		} else {
1481 			/* pad with spaces */
1482 			while (strlcat(buf, "    ", sizeof(buf)) < sizeof(buf))
1483 				/* nop */ ;
1484 		}
1485 
1486 		if (current)
1487 			wattron(tabline, tab_face.current_tab);
1488 		else
1489 			wattron(tabline, tab_face.tab);
1490 
1491 		wprintw(tabline, "%s", buf);
1492 		if (TAILQ_NEXT(tab, tabs) != NULL)
1493 			wprintw(tabline, " ");
1494 
1495 		if (current)
1496 			wattroff(tabline, tab_face.current_tab);
1497 		else
1498 			wattroff(tabline, tab_face.tab);
1499 	}
1500 
1501 	wattron(tabline, tab_face.background);
1502 	for (; x < (size_t)COLS; ++x)
1503 		waddch(tabline, ' ');
1504 	if (truncated)
1505 		mvwprintw(tabline, 0, COLS-1, ">");
1506 }
1507 
1508 static void
1509 redraw_window(WINDOW *win, int height, struct window *window)
1510 {
1511 	struct vline	*vl;
1512 	int		 l;
1513 
1514 	werase(win);
1515 
1516 	window->line_off = MIN(window->line_max-1, window->line_off);
1517 	if (TAILQ_EMPTY(&window->head))
1518 		return;
1519 
1520 	l = 0;
1521 	vl = nth_line(window, window->line_off);
1522 	for (; vl != NULL; vl = TAILQ_NEXT(vl, vlines)) {
1523 		wmove(win, l, 0);
1524 		print_vline(win, vl);
1525 		l++;
1526 		if (l == height)
1527 			break;
1528 	}
1529 
1530 	wmove(win, window->curs_y, window->curs_x);
1531 }
1532 
1533 static void
1534 redraw_help(void)
1535 {
1536 	redraw_window(help, help_lines, &helpwin);
1537 }
1538 
1539 static void
1540 redraw_body(struct tab *tab)
1541 {
1542 	redraw_window(body, body_lines, &tab->window);
1543 }
1544 
1545 static inline char
1546 trust_status_char(enum trust_state ts)
1547 {
1548 	switch (ts) {
1549 	case TS_UNKNOWN:	return 'u';
1550 	case TS_UNTRUSTED:	return '!';
1551 	case TS_TRUSTED:	return 'v';
1552 	case TS_VERIFIED:	return 'V';
1553 	}
1554 }
1555 
1556 static void
1557 redraw_modeline(struct tab *tab)
1558 {
1559 	double		 pct;
1560 	int		 x, y, max_x, max_y;
1561 	const char	*mode = tab->window.page.name;
1562 	const char	*spin = "-\\|/";
1563 
1564 	werase(modeline);
1565 	wattron(modeline, A_REVERSE);
1566 	wmove(modeline, 0, 0);
1567 
1568 	wprintw(modeline, "-%c%c %s ",
1569 	    spin[tab->loading_anim_step],
1570 	    trust_status_char(tab->trust),
1571 	    mode == NULL ? "(none)" : mode);
1572 
1573 	pct = (tab->window.line_off + tab->window.curs_y) * 100.0 / tab->window.line_max;
1574 
1575 	if (tab->window.line_max <= (size_t)body_lines)
1576                 wprintw(modeline, "All ");
1577 	else if (tab->window.line_off == 0)
1578                 wprintw(modeline, "Top ");
1579 	else if (tab->window.line_off + body_lines >= tab->window.line_max)
1580 		wprintw(modeline, "Bottom ");
1581 	else
1582 		wprintw(modeline, "%.0f%% ", pct);
1583 
1584 	wprintw(modeline, "%d/%d %s ",
1585 	    tab->window.line_off + tab->window.curs_y,
1586 	    tab->window.line_max,
1587 	    tab->hist_cur->h);
1588 
1589 	getyx(modeline, y, x);
1590 	getmaxyx(modeline, max_y, max_x);
1591 
1592 	(void)y;
1593 	(void)max_y;
1594 
1595 	for (; x < max_x; ++x)
1596 		waddstr(modeline, "-");
1597 }
1598 
1599 static void
1600 redraw_minibuffer(void)
1601 {
1602 	struct tab *tab;
1603 	size_t off_y, off_x = 0;
1604 	char *start, *c;
1605 
1606 	werase(minibuf);
1607 
1608 	if (in_minibuffer) {
1609 		mvwprintw(minibuf, 0, 0, "%s", ministate.prompt);
1610 		if (ministate.hist_cur != NULL)
1611 			wprintw(minibuf, "(%zu/%zu) ",
1612 			    ministate.hist_off + 1,
1613 			    ministate.history->len);
1614 
1615 		getyx(minibuf, off_y, off_x);
1616 
1617 		start = ministate.hist_cur != NULL
1618 			? ministate.hist_cur->h
1619 			: ministate.buf;
1620 		c = utf8_nth(ministate.window.current_line->line,
1621 		    ministate.window.cpoff);
1622 		while (utf8_swidth_between(start, c) > (size_t)COLS/2) {
1623 			start = utf8_next_cp(start);
1624 		}
1625 
1626 		waddstr(minibuf, start);
1627 	}
1628 
1629 	if (ministate.curmesg != NULL)
1630                 wprintw(minibuf, in_minibuffer ? "  [%s]" : "%s",
1631 		    ministate.curmesg);
1632 
1633 	if (!in_minibuffer && ministate.curmesg == NULL)
1634 		waddstr(minibuf, keybuf);
1635 
1636 	/* If nothing else, show the URL at point */
1637 	if (!in_minibuffer && ministate.curmesg == NULL && *keybuf == '\0') {
1638 		tab = current_tab();
1639 		if (tab->window.current_line != NULL &&
1640 		    tab->window.current_line->parent->type == LINE_LINK)
1641 			waddstr(minibuf, tab->window.current_line->parent->alt);
1642 	}
1643 
1644 	if (in_minibuffer)
1645 		wmove(minibuf, 0, off_x + utf8_swidth_between(start, c));
1646 }
1647 
1648 static void
1649 redraw_tab(struct tab *tab)
1650 {
1651 	if (side_window) {
1652 		redraw_help();
1653 		wnoutrefresh(help);
1654 	}
1655 
1656 	redraw_tabline();
1657 	redraw_body(tab);
1658 	redraw_modeline(tab);
1659 	redraw_minibuffer();
1660 
1661 	wnoutrefresh(tabline);
1662 	wnoutrefresh(modeline);
1663 
1664 	if (in_minibuffer) {
1665 		wnoutrefresh(body);
1666 		wnoutrefresh(minibuf);
1667 	} else {
1668 		wnoutrefresh(minibuf);
1669 		wnoutrefresh(body);
1670 	}
1671 
1672 	doupdate();
1673 }
1674 
1675 static void
1676 emit_help_item(char *prfx, void *fn)
1677 {
1678 	struct line	*l;
1679 	struct cmds	*cmd;
1680 
1681 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
1682 		if (fn == cmd->fn)
1683 			break;
1684 	}
1685 	assert(cmd != NULL);
1686 
1687 	if ((l = calloc(1, sizeof(*l))) == NULL)
1688 		abort();
1689 
1690 	l->type = LINE_TEXT;
1691 	l->alt = NULL;
1692 
1693 	asprintf(&l->line, "%s %s", prfx, cmd->cmd);
1694 
1695 	if (TAILQ_EMPTY(&helpwin.page.head))
1696 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
1697 	else
1698 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
1699 }
1700 
1701 static void
1702 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
1703 {
1704 	struct keymap	*k;
1705 	char		 p[32];
1706 	const char	*kn;
1707 
1708 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
1709 		strlcpy(p, prfx, sizeof(p));
1710 		if (*p != '\0')
1711 			strlcat(p, " ", sizeof(p));
1712 		if (k->meta)
1713 			strlcat(p, "M-", sizeof(p));
1714 		if ((kn = unkbd(k->key)) != NULL)
1715 			strlcat(p, kn, sizeof(p));
1716 		else
1717 			strlcat(p, keyname(k->key), sizeof(p));
1718 
1719 		if (k->fn == NULL)
1720 			rec_compute_help(&k->map, p, sizeof(p));
1721 		else
1722 			emit_help_item(p, k->fn);
1723 	}
1724 }
1725 
1726 static void
1727 recompute_help(void)
1728 {
1729 	char	p[32] = { 0 };
1730 
1731 	empty_vlist(&helpwin);
1732 	empty_linelist(&helpwin);
1733 	rec_compute_help(current_map, p, sizeof(p));
1734 	wrap_page(&helpwin, help_cols);
1735 }
1736 
1737 static void
1738 vmessage(const char *fmt, va_list ap)
1739 {
1740 	if (evtimer_pending(&clminibufev, NULL))
1741 		evtimer_del(&clminibufev);
1742 	evtimer_set(&clminibufev, handle_clear_minibuf, NULL);
1743 	evtimer_add(&clminibufev, &clminibufev_timer);
1744 
1745 	free(ministate.curmesg);
1746 
1747 	/* TODO: what to do if the allocation fails here? */
1748 	if (vasprintf(&ministate.curmesg, fmt, ap) == -1)
1749 		ministate.curmesg = NULL;
1750 
1751 	redraw_minibuffer();
1752 	if (in_minibuffer) {
1753 		wrefresh(body);
1754 		wrefresh(minibuf);
1755 	} else {
1756 		wrefresh(minibuf);
1757 		wrefresh(body);
1758 	}
1759 }
1760 
1761 static void
1762 message(const char *fmt, ...)
1763 {
1764 	va_list ap;
1765 
1766 	va_start(ap, fmt);
1767 	vmessage(fmt, ap);
1768 	va_end(ap);
1769 }
1770 
1771 static void
1772 start_loading_anim(struct tab *tab)
1773 {
1774 	if (tab->loading_anim)
1775 		return;
1776 	tab->loading_anim = 1;
1777 	evtimer_set(&tab->loadingev, update_loading_anim, tab);
1778 	evtimer_add(&tab->loadingev, &loadingev_timer);
1779 }
1780 
1781 static void
1782 update_loading_anim(int fd, short ev, void *d)
1783 {
1784 	struct tab	*tab = d;
1785 
1786 	tab->loading_anim_step = (tab->loading_anim_step+1)%4;
1787 
1788 	if (tab->flags & TAB_CURRENT) {
1789 		redraw_modeline(tab);
1790 		wrefresh(modeline);
1791 		wrefresh(body);
1792 		if (in_minibuffer)
1793 			wrefresh(minibuf);
1794 	}
1795 
1796 	evtimer_add(&tab->loadingev, &loadingev_timer);
1797 }
1798 
1799 static void
1800 stop_loading_anim(struct tab *tab)
1801 {
1802 	if (!tab->loading_anim)
1803 		return;
1804 	evtimer_del(&tab->loadingev);
1805 	tab->loading_anim = 0;
1806 	tab->loading_anim_step = 0;
1807 
1808 	if (!(tab->flags & TAB_CURRENT))
1809 		return;
1810 
1811 	redraw_modeline(tab);
1812 
1813 	wrefresh(modeline);
1814 	wrefresh(body);
1815 	if (in_minibuffer)
1816 		wrefresh(minibuf);
1817 }
1818 
1819 static void
1820 load_url_in_tab(struct tab *tab, const char *url)
1821 {
1822 	message("Loading %s...", url);
1823 	start_loading_anim(tab);
1824 	load_url(tab, url);
1825 
1826 	tab->window.curs_x = 0;
1827 	tab->window.curs_y = 0;
1828 	redraw_tab(tab);
1829 }
1830 
1831 static void
1832 enter_minibuffer(void (*self_insert_fn)(void), void (*donefn)(void),
1833     void (*abortfn)(void), struct histhead *hist)
1834 {
1835 	in_minibuffer = 1;
1836 	base_map = &minibuffer_map;
1837 	current_map = &minibuffer_map;
1838 
1839 	base_map->unhandled_input = self_insert_fn;
1840 
1841 	ministate.donefn = donefn;
1842 	ministate.abortfn = abortfn;
1843 	memset(ministate.buf, 0, sizeof(ministate.buf));
1844 	ministate.window.current_line = &ministate.vline;
1845 	ministate.window.current_line->line = ministate.buf;
1846 	ministate.window.cpoff = 0;
1847 	strlcpy(ministate.buf, "", sizeof(ministate.prompt));
1848 
1849 	ministate.history = hist;
1850 	ministate.hist_cur = NULL;
1851 	ministate.hist_off = 0;
1852 }
1853 
1854 static void
1855 exit_minibuffer(void)
1856 {
1857 	werase(minibuf);
1858 
1859 	in_minibuffer = 0;
1860 	base_map = &global_map;
1861 	current_map = &global_map;
1862 }
1863 
1864 static void
1865 switch_to_tab(struct tab *tab)
1866 {
1867 	struct tab	*t;
1868 
1869 	TAILQ_FOREACH(t, &tabshead, tabs) {
1870 		t->flags &= ~TAB_CURRENT;
1871 	}
1872 
1873 	tab->flags |= TAB_CURRENT;
1874 }
1875 
1876 unsigned int
1877 tab_new_id(void)
1878 {
1879 	return tab_counter++;
1880 }
1881 
1882 static struct tab *
1883 new_tab(const char *url)
1884 {
1885 	struct tab	*tab;
1886 
1887 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
1888 		event_loopbreak();
1889 		return NULL;
1890 	}
1891 
1892 	TAILQ_INIT(&tab->hist.head);
1893 
1894 	TAILQ_INIT(&tab->window.head);
1895 
1896 	tab->id = tab_new_id();
1897 	switch_to_tab(tab);
1898 
1899 	if (TAILQ_EMPTY(&tabshead))
1900 		TAILQ_INSERT_HEAD(&tabshead, tab, tabs);
1901 	else
1902 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
1903 
1904 	load_url_in_tab(tab, url);
1905 	return tab;
1906 }
1907 
1908 static void
1909 session_new_tab_cb(const char *url)
1910 {
1911 	new_tab(url);
1912 }
1913 
1914 static void
1915 usage(void)
1916 {
1917 	fprintf(stderr, "USAGE: %s [url]\n", getprogname());
1918 }
1919 
1920 int
1921 ui_init(int argc, char * const *argv)
1922 {
1923 	const char *url = NEW_TAB_URL;
1924 	int ch;
1925 
1926 	while ((ch = getopt(argc, argv, "")) != -1) {
1927 		switch (ch) {
1928 		default:
1929 			usage();
1930 			return 0;
1931 		}
1932 	}
1933 	argc -= optind;
1934 	argv += optind;
1935 
1936 	if (argc != 0)
1937 		url = argv[0];
1938 
1939 	setlocale(LC_ALL, "");
1940 
1941 	TAILQ_INIT(&global_map.m);
1942 	global_map.unhandled_input = global_key_unbound;
1943 
1944 	TAILQ_INIT(&minibuffer_map.m);
1945 
1946 	TAILQ_INIT(&eecmd_history.head);
1947 	TAILQ_INIT(&ir_history.head);
1948 	TAILQ_INIT(&lu_history.head);
1949 
1950 	ministate.line.type = LINE_TEXT;
1951 	ministate.vline.parent = &ministate.line;
1952 	ministate.window.current_line = &ministate.vline;
1953 
1954 	/* initialize help window */
1955 	TAILQ_INIT(&helpwin.head);
1956 
1957 	base_map = &global_map;
1958 	current_map = &global_map;
1959 	load_default_keys();
1960 
1961 	initscr();
1962 	raw();
1963 	noecho();
1964 
1965 	nonl();
1966 	intrflush(stdscr, FALSE);
1967 
1968 	if ((tabline = newwin(1, COLS, 0, 0)) == NULL)
1969 		return 0;
1970 	if ((body = newwin(LINES - 3, COLS, 1, 0)) == NULL)
1971 		return 0;
1972 	if ((modeline = newwin(1, COLS, LINES-2, 0)) == NULL)
1973 		return 0;
1974 	if ((minibuf = newwin(1, COLS, LINES-1, 0)) == NULL)
1975 		return 0;
1976 	if ((help = newwin(1, 1, 1, 0)) == NULL)
1977 		return 0;
1978 
1979 	body_lines = LINES-3;
1980 	body_cols = COLS;
1981 
1982 	keypad(body, TRUE);
1983 	scrollok(body, TRUE);
1984 
1985 	/* non-blocking input */
1986 	wtimeout(body, 0);
1987 
1988 	mvwprintw(body, 0, 0, "");
1989 
1990 	event_set(&stdioev, 0, EV_READ | EV_PERSIST, dispatch_stdio, NULL);
1991 	event_add(&stdioev, NULL);
1992 
1993 	signal_set(&winchev, SIGWINCH, handle_resize, NULL);
1994 	signal_add(&winchev, NULL);
1995 
1996 	load_last_session(session_new_tab_cb);
1997 	if (strcmp(url, NEW_TAB_URL) || TAILQ_EMPTY(&tabshead))
1998 		new_tab(url);
1999 
2000 	return 1;
2001 }
2002 
2003 void
2004 ui_on_tab_loaded(struct tab *tab)
2005 {
2006 	stop_loading_anim(tab);
2007 	message("Loaded %s", tab->hist_cur->h);
2008 
2009 	redraw_tabline();
2010 	wrefresh(tabline);
2011 	if (in_minibuffer)
2012 		wrefresh(minibuf);
2013 	else
2014 		wrefresh(body);
2015 }
2016 
2017 void
2018 ui_on_tab_refresh(struct tab *tab)
2019 {
2020 	wrap_page(&tab->window, body_cols);
2021 	if (tab->flags & TAB_CURRENT) {
2022 		restore_cursor(&tab->window);
2023 		redraw_tab(tab);
2024 	}
2025 }
2026 
2027 void
2028 ui_require_input(struct tab *tab, int hide)
2029 {
2030 	/* TODO: hard-switching to another tab is ugly */
2031 	switch_to_tab(tab);
2032 
2033 	enter_minibuffer(ir_self_insert, ir_select, exit_minibuffer,
2034 	    &ir_history);
2035 	strlcpy(ministate.prompt, "Input required: ",
2036 	    sizeof(ministate.prompt));
2037 	redraw_tab(tab);
2038 }
2039 
2040 void
2041 ui_yornp(const char *prompt, void (*fn)(int, unsigned int),
2042     unsigned int data)
2043 {
2044 	size_t len;
2045 
2046 	if (in_minibuffer) {
2047 		fn(0, data);
2048 		return;
2049 	}
2050 
2051 	yornp_cb = fn;
2052 	yornp_data = data;
2053 	enter_minibuffer(yornp_self_insert, yornp_self_insert,
2054 	    yornp_abort, NULL);
2055 
2056 	len = sizeof(ministate.prompt);
2057 	strlcpy(ministate.prompt, prompt, len);
2058 	strlcat(ministate.prompt, " (y or n) ", len);
2059 	redraw_tab(current_tab());
2060 }
2061 
2062 void
2063 ui_notify(const char *fmt, ...)
2064 {
2065 	va_list ap;
2066 
2067 	va_start(ap, fmt);
2068 	vmessage(fmt, ap);
2069 	va_end(ap);
2070 }
2071 
2072 void
2073 ui_end(void)
2074 {
2075 	endwin();
2076 }